$(INSTALL) -m 644 doc/appdocsxml.dtd "$(DESTDIR)$(ASTDATADIR)/documentation"
endif
$(INSTALL) -m 644 doc/asterisk.8 "$(DESTDIR)$(ASTMANDIR)/man8"
- $(INSTALL) -m 644 doc/astdb*.8 "$(DESTDIR)$(ASTMANDIR)/man8"
$(INSTALL) -m 644 contrib/scripts/astgenkey.8 "$(DESTDIR)$(ASTMANDIR)/man8"
$(INSTALL) -m 644 contrib/scripts/autosupport.8 "$(DESTDIR)$(ASTMANDIR)/man8"
$(INSTALL) -m 644 contrib/scripts/safe_asterisk.8 "$(DESTDIR)$(ASTMANDIR)/man8"
.lastclean: .cleancount
@$(MAKE) clean
- @[ -f "$(DESTDIR)$(ASTDBDIR)/astdb.sqlite3" ] || [ ! -f "$(DESTDIR)$(ASTDBDIR)/astdb" ] || [ ! -f menuselect.makeopts ] || grep -q MENUSELECT_UTILS=.*astdb2sqlite3 menuselect.makeopts || (sed -i.orig -e's/MENUSELECT_UTILS=\(.*\)/MENUSELECT_UTILS=\1 astdb2sqlite3/' menuselect.makeopts && echo "Updating menuselect.makeopts to include astdb2sqlite3" && echo "Original version backed up to menuselect.makeopts.orig")
$(SUBDIRS_UNINSTALL):
+++ /dev/null
-.TH "ASTDB2BDB" "8" "30 SEPTEMBER 2013" "Asterisk 11" ""
-
-.SH NAME
-astdb2bdb \- convert astdb back to Berkeley DB 1.86
-.SH SYNOPSIS
-
-.B cd \fIastvarlibdir\fB && astdb2bdb path/to/astdb.sqlite3
-
-.SH "DESCRIPTION"
-Up until version version 11, Asterisk used an old version of the
-Berkeley DB 1.86 (bdb) to store its internal persistent database. In
-version 11 it switched to using a SQLIte 3 database. This program is
-used to convert the newly-formatted SQLite 3 astdb back to bdb.
-
-You may need it in case of reverting an upgrade or other similar
-scenarios.
-
-.SH OPTIONS
-There is a single (and required) parameter: the path the the sqlite file.
-The output file will be a file called
-.B astdb
-in the current working directory.
-
-.SH EXAMPLES
-In case you want to revert an upgrade to Asterisk 11, you can do the
-following (while Asterisk is not running):
-
- cd /var/lib/asterisk && astdb2bdb astdb.sqlite3 && rm astdb.sqlite3
-
-This will convert the newly-formatted astdb back to the old format, and
-delete it (to avoid obsolete data copies).
-
-.SH NOTES
-Berkeley DB 1.86 is obsolete. It is incompatible with newer versions
-(4.x and newer) that you may see around. Chances are you don't have the
-tools to use it independently of Asterisk.
-
-.SH SEE ALSO
-.B astdb2sqlite3(8),
-.B asterisk(8)
-
-.SH AUTHOR
-astdb2bdb was written by Terry Wilson <twilson@digium.com>.
-
-This manual page was written by Tzafrir Cohen <tzafrir.cohen@xorcom.com>.
+++ /dev/null
-.TH "ASTDB2SQLITE3" "8" "30 SEPTEMBER 2013" "Asterisk 11" ""
-
-.SH NAME
-astdb2sqlite3 \- convert astdb to SQLite 3
-.SH SYNOPSIS
-
-.B astdb2sqlite3 path/to/astdb
-
-.SH "DESCRIPTION"
-Up until version version 11, Asterisk used an old version of the
-Berkeley DB 1.86 (bdb) to store its internal persistent database. In
-version 11 it switched to using a SQLite 3 database. This program is
-used to convert an existing bdb astdb file to astdb.sqlite3.
-
-Normally the conversion is done by Asterisk itself which will run this
-program. But you may need to run it on your own.
-
-.SH OPTIONS
-There is a single (and required) parameter: the path the the bdb file.
-The output file name will be the same as the input, with
-.B .sqlite3
-appended.
-
-.SH EXAMPLES
-Asterisk will typically run the following to upgrade the database:
-
- astdb2sqlite3 /var/lib/asterisk/astdb
-
-which will create \fB/var/lib/asterisk/astdb.sqlite3\fR.
-
-.SH SEE ALSO
-.B astdb2bdb(8),
-.B asterisk(8)
-
-.SH AUTHOR
-astdb2sqlite3 was written by Terry Wilson <twilson@digium.com>.
-
-This manual page was written by Tzafrir Cohen <tzafrir.cohen@xorcom.com>.
|| init_stmt(&put_stmt, put_stmt_sql, sizeof(put_stmt_sql));
}
-static int convert_bdb_to_sqlite3(void)
-{
- char *cmd;
- int res;
-
- res = ast_asprintf(&cmd, "%s/astdb2sqlite3 '%s'\n", ast_config_AST_SBIN_DIR, ast_config_AST_DB);
- if (0 <= res) {
- res = ast_safe_system(cmd);
- ast_free(cmd);
- }
-
- return res;
-}
-
static int db_create_astdb(void)
{
int res = 0;
static int db_open(void)
{
- char *dbname;
struct stat dont_care;
+ char dbname[strlen(ast_config_AST_DB) + sizeof(".sqlite3")];
- if (!(dbname = ast_alloca(strlen(ast_config_AST_DB) + sizeof(".sqlite3")))) {
- return -1;
- }
strcpy(dbname, ast_config_AST_DB);
strcat(dbname, ".sqlite3");
if (stat(dbname, &dont_care) && !stat(ast_config_AST_DB, &dont_care)) {
- if (convert_bdb_to_sqlite3()) {
- ast_log(LOG_ERROR, "*** Database conversion failed!\n");
- ast_log(LOG_ERROR, "*** Asterisk now uses SQLite3 for its internal\n");
- ast_log(LOG_ERROR, "*** database. Conversion from the old astdb\n");
- ast_log(LOG_ERROR, "*** failed. Most likely the astdb2sqlite3 utility\n");
- ast_log(LOG_ERROR, "*** was not selected for build. To convert the\n");
- ast_log(LOG_ERROR, "*** old astdb, please delete '%s'\n", dbname);
- ast_log(LOG_ERROR, "*** and re-run 'make menuselect' and select astdb2sqlite3\n");
- ast_log(LOG_ERROR, "*** in the Utilities section, then 'make && make install'.\n");
- ast_log(LOG_ERROR, "*** It is also imperative that the user under which\n");
- ast_log(LOG_ERROR, "*** Asterisk runs have write permission to the directory\n");
- ast_log(LOG_ERROR, "*** where the database resides.\n");
- sleep(5);
- } else {
- ast_log(LOG_NOTICE, "Database conversion succeeded!\n");
- }
+ ast_log(LOG_ERROR, "When Asterisk 10.0.0 was released, the format of Asterisk's internal\n");
+ ast_log(LOG_ERROR, "database was changed from Berkeley DB to SQLite3. Part of that change\n");
+ ast_log(LOG_ERROR, "involved the creation of a conversion utility - astdb2sqlite3 - that\n");
+ ast_log(LOG_ERROR, "was shipped with Asterisk. This conversion utility performed a\n");
+ ast_log(LOG_ERROR, "one-time migration from the old format to the new one.\n");
+ ast_log(LOG_ERROR, "\n");
+ ast_log(LOG_ERROR, "Starting with Asterisk 23.0.0, astdb2sqlite3 no longer ships as part\n");
+ ast_log(LOG_ERROR, "of the Asterisk distribution. If you are upgrading from a version of\n");
+ ast_log(LOG_ERROR, "Asterisk that still uses the Berkeley DB implementation, you will need\n");
+ ast_log(LOG_ERROR, "to acquire astdb2sqlite3 from an earlier release of Asterisk.\n");
}
ast_mutex_lock(&dblock);
rm -f aelparse.c aelbison.c
rm -f threadstorage.c
rm -f utils.c strings.c poll.c version.c sha1.c astobj2.c refcounter
- rm -f db1-ast/.*.d
- @$(MAKE) -C db1-ast clean
md5.c: $(ASTTOPDIR)/main/md5.c
streamplayer: streamplayer.o
-CHECK_SUBDIR: # do nothing, just make sure that we recurse in the subdir/
-db1-ast/libdb1.a: CHECK_SUBDIR
- _ASTCFLAGS="$(_ASTCFLAGS) -Wno-strict-aliasing -Wno-old-style-definition" ASTCFLAGS="$(ASTCFLAGS)" $(MAKE) -C db1-ast libdb1.a
-
-astdb2sqlite3: LIBS+=$(SQLITE3_LIB)
-astdb2sqlite3: _ASTCFLAGS+=$(SQLITE3_INCLUDE)
-astdb2sqlite3: db1-ast/libdb1.a
-
-astdb2bdb: LIBS+=$(SQLITE3_LIB)
-astdb2bdb: _ASTCFLAGS+=$(SQLITE3_INCLUDE)
-astdb2bdb: db1-ast/libdb1.a
-
conf_bridge_binaural_hrir_importer: LIBS+=$(SNDFILE_LIB)
conf_bridge_binaural_hrir_importer.o: _ASTCFLAGS+=$(SNDFILE_INCLUDE)
+++ /dev/null
-/*
- * Asterisk -- An open source telephony toolkit.
- *
- * Copyright (C) 2011, Digium, Inc.
- *
- * Mark Spencer <twilson@digium.com>
- *
- * See http://www.asterisk.org for more information about
- * the Asterisk project. Please do not directly contact
- * any of the maintainers of this project for assistance;
- * the project provides a web site, mailing lists and IRC
- * channels for your use.
- *
- * This program is free software, distributed under the terms of
- * the GNU General Public License Version 2. See the LICENSE file
- * at the top of the source tree.
- */
-
-/*! \file
- *
- * \brief SQLite 3 astdb to Berkeley DB converter
- *
- * \author Terry Wilson <twilson@digium.com>
- */
-
-/*** MODULEINFO
- <support_level>core</support_level>
- ***/
-
-#include "asterisk.h"
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <sqlite3.h>
-#include <libgen.h> /* OS X doesn't have the basename function in strings.h */
-
-#include "db1-ast/include/db.h"
-
-static sqlite3 *sql3db;
-static DB *bdb;
-
-static int add_row_to_bdb(void *arg, int columns, char **values, char **column_names)
-{
- DBT key = { 0, }, value = { 0, };
-
- if (columns != 2 || strcmp(column_names[0], "key") || strcmp(column_names[1], "value")) {
- fprintf(stderr, "Unknown row type\n");
- return SQLITE_ABORT;
- }
-
- key.data = values[0];
- key.size = strlen(values[0]) + 1;
- value.data = values[1];
- value.size = strlen(values[1]) + 1;
-
- if (bdb->put(bdb, &key, &value, 0)) {
- return SQLITE_ABORT;
- }
-
- bdb->sync(bdb, 0);
-
- return 0;
-}
-
-static int convert_bdb_to_sqlite3(void)
-{
- char *errmsg = NULL;
- if (sqlite3_exec(sql3db, "SELECT key,value FROM astdb", add_row_to_bdb, NULL, &errmsg) != SQLITE_OK) {
- fprintf(stderr, "Could not add row to Berkeley DB: %s\n", errmsg);
- return -1;
- }
-
- return 0;
-}
-
-static int db_open_sqlite3(const char *dbname)
-{
- if (sqlite3_open(dbname, &sql3db) != SQLITE_OK) {
- fprintf(stderr, "Unable to open Asterisk database '%s': %s\n", dbname, sqlite3_errmsg(sql3db));
- sqlite3_close(sql3db);
- return -1;
- }
-
- return 0;
-}
-
-static int create_bdb_astdb(void)
-{
- if (!bdb && !(bdb = dbopen("astdb", O_CREAT | O_RDWR | O_TRUNC, AST_FILE_MODE, DB_BTREE, NULL))) {
- fprintf(stderr, "Unable to create astdb: %s\n", strerror(errno));
- return -1;
- }
- return 0;
-}
-
-int main(int argc, char *argv[])
-{
- struct stat dont_care;
-
- if (argc != 2) {
- fprintf(stderr, "%s takes the path of SQLite3 astdb as its only argument\n", basename(argv[0]));
- fprintf(stderr, "and will produce a file 'astdb' in the current directory\n"
- "Make a backup of any existing Berkeley DB astdb you have and copy\n"
- "the new astdb to its location: often /var/lib/asterisk/astdb\n");
- exit(-1);
- }
-
- if (stat(argv[1], &dont_care)) {
- fprintf(stderr, "Unable to open %s: %s\n", argv[1], strerror(errno));
- exit(-1);
- }
-
- if (db_open_sqlite3(argv[1])) {
- exit(-1);
- }
-
- if (create_bdb_astdb()) {
- exit(-1);
- }
-
- if (convert_bdb_to_sqlite3()) {
- fprintf(stderr, "Database conversion failed!\n");
- exit(-1);
- sqlite3_close(sql3db);
- }
-
- printf("Created ./astdb. Back up any existing astdb and copy the created\n");
- printf("astdb file to the original's location. Often /var/lib/asterisk/astdb.\n");
-
- sqlite3_close(sql3db);
- return 0;
-}
+++ /dev/null
-/*
- * Asterisk -- An open source telephony toolkit.
- *
- * Copyright (C) 1999 - 2005, Digium, Inc.
- *
- * Mark Spencer <markster@digium.com>
- *
- * See http://www.asterisk.org for more information about
- * the Asterisk project. Please do not directly contact
- * any of the maintainers of this project for assistance;
- * the project provides a web site, mailing lists and IRC
- * channels for your use.
- *
- * This program is free software, distributed under the terms of
- * the GNU General Public License Version 2. See the LICENSE file
- * at the top of the source tree.
- */
-
-/*! \file
- *
- * \brief Berkeley DB to SQLite3 converter
- *
- * \author Terry Wilson <twilson@digium.com>
- */
-
-/*** MODULEINFO
- <support_level>core</support_level>
- ***/
-
-#include "asterisk.h"
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <sqlite3.h>
-#include <libgen.h> /* OS X doesn't have the basename function in strings.h */
-
-#include "db1-ast/include/db.h"
-
-#define MAX_DB_FIELD 256
-#define MIN(a,b) \
-({ typeof (a) _a = (a); \
- typeof (b) _b = (b); \
- a < _b ? _a : _b; })
-
-static sqlite3 *astdb;
-
-#define DEFINE_SQL_STATEMENT(stmt,sql) static sqlite3_stmt *stmt; \
- const char stmt##_sql[] = sql;
-
-DEFINE_SQL_STATEMENT(put_stmt, "INSERT OR REPLACE INTO astdb (key, value) VALUES (?, ?)")
-DEFINE_SQL_STATEMENT(create_astdb_stmt, "CREATE TABLE IF NOT EXISTS astdb(key VARCHAR(256), value VARCHAR(256), PRIMARY KEY(key))")
-
-static int db_execute_transaction_sql(const char *sql)
-{
- char *errmsg = NULL;
- int res =0;
-
- sqlite3_exec(astdb, sql, NULL, NULL, &errmsg);
- if (errmsg) {
- fprintf(stderr, "Error executing SQL: %s\n", errmsg);
- sqlite3_free(errmsg);
- res = -1;
- }
-
- return res;
-}
-
-static int ast_db_begin_transaction(void)
-{
- return db_execute_transaction_sql("BEGIN TRANSACTION");
-}
-
-static int ast_db_commit_transaction(void)
-{
- return db_execute_transaction_sql("COMMIT");
-}
-
-static int ast_db_rollback_transaction(void)
-{
- return db_execute_transaction_sql("ROLLBACK");
-}
-
-static int db_put_raw(const char *key, size_t keylen, const char *value, size_t valuelen)
-{
- int res = 0;
-
- if (sqlite3_bind_text(put_stmt, 1, key, keylen, SQLITE_STATIC) != SQLITE_OK) {
- fprintf(stderr, "Couldn't bind key to stmt: %s\n", sqlite3_errmsg(astdb));
- res = -1;
- } else if (sqlite3_bind_text(put_stmt, 2, value, valuelen, SQLITE_STATIC) != SQLITE_OK) {
- fprintf(stderr, "Couldn't bind value to stmt: %s\n", sqlite3_errmsg(astdb));
- res = -1;
- } else if (sqlite3_step(put_stmt) != SQLITE_DONE) {
- fprintf(stderr, "Couldn't execute statement: %s\n", sqlite3_errmsg(astdb));
- res = -1;
- }
- sqlite3_reset(put_stmt);
-
- return res;
-}
-
-static int convert_bdb_to_sqlite3(const char *bdb_dbname)
-{
- DB *bdb;
- DBT key = { 0, }, value = { 0, }, last_key = { 0, };
- int res, last = 0;
- char last_key_s[MAX_DB_FIELD];
-
- if (!(bdb = dbopen(bdb_dbname, O_RDONLY, AST_FILE_MODE, DB_BTREE, NULL))) {
- fprintf(stderr, "Unable to open Asterisk database '%s'\n", bdb_dbname);
- return -1;
- }
-
- if (bdb->seq(bdb, &last_key, &value, R_LAST)) {
- /* Empty database */
- return 0;
- }
-
- memcpy(last_key_s, last_key.data, MIN(last_key.size - 1, sizeof(last_key_s)));
- last_key_s[last_key.size - 1] = '\0';
- for (res = bdb->seq(bdb, &key, &value, R_FIRST);
- !res; res = bdb->seq(bdb, &key, &value, R_NEXT)) {
- last = !strcmp(key.data, last_key_s);
- db_put_raw((const char *) key.data, key.size - 1, (const char *) value.data, value.size - 1);
- if (last) {
- break;
- }
- }
-
- bdb->close(bdb);
-
- return 0;
-}
-
-static int init_stmt(sqlite3_stmt **stmt, const char *sql, size_t len)
-{
- if (sqlite3_prepare(astdb, sql, len, stmt, NULL) != SQLITE_OK) {
- fprintf(stderr, "Couldn't prepare statement '%s': %s\n", sql, sqlite3_errmsg(astdb));
- return -1;
- }
-
- return 0;
-}
-
-static int db_create_astdb(void)
-{
- if (init_stmt(&create_astdb_stmt, create_astdb_stmt_sql, sizeof(create_astdb_stmt_sql))) {
- return -1;
- }
-
- ast_db_begin_transaction();
- if (sqlite3_step(create_astdb_stmt) != SQLITE_DONE) {
- fprintf(stderr, "Couldn't create astdb table: %s\n", sqlite3_errmsg(astdb));
- ast_db_rollback_transaction();
- sqlite3_reset(create_astdb_stmt);
- return -1;
- }
-
- ast_db_commit_transaction();
- sqlite3_reset(create_astdb_stmt);
-
- return 0;
-}
-
-static int init_statements(void)
-{
- /* Don't initialize create_astdb_statement here as the astdb table needs to exist
- * brefore these statements can be initialized */
- return init_stmt(&put_stmt, put_stmt_sql, sizeof(put_stmt_sql));
-}
-
-static int db_open(const char *dbname)
-{
- if (sqlite3_open(dbname, &astdb) != SQLITE_OK) {
- fprintf(stderr, "Unable to open Asterisk database '%s': %s\n", dbname, sqlite3_errmsg(astdb));
- sqlite3_close(astdb);
- return -1;
- }
-
- return 0;
-}
-
-static int sql_db_init(const char *dbname)
-{
- if (db_open(dbname) || db_create_astdb() || init_statements()) {
- return -1;
- }
-
- return 0;
-}
-
-int main(int argc, char *argv[])
-{
- char *dbname;
- struct stat dont_care;
-
- if (argc != 2) {
- fprintf(stderr, "%s takes the path of astdb as its only argument\n", basename(argv[0]));
- exit(-1);
- }
-
- if (stat(argv[1], &dont_care)) {
- fprintf(stderr, "Unable to open %s: %s\n", argv[1], strerror(errno));
- exit(-1);
- }
-
- if (!(dbname = alloca(strlen(argv[1]) + sizeof(".sqlite3")))) {
- exit(-1);
- }
-
- strcpy(dbname, argv[1]);
- strcat(dbname, ".sqlite3");
-
- if (!stat(dbname, &dont_care)) {
- fprintf(stderr, "%s already exists!\n", dbname);
- exit(-1);
- }
-
- if (sql_db_init(dbname)) {
- exit(-1);
- }
-
- if (convert_bdb_to_sqlite3(argv[1])) {
- fprintf(stderr, "Database conversion failed!\n");
- exit(-1);
- sqlite3_close(astdb);
- }
-
- sqlite3_close(astdb);
- return 0;
-}
+++ /dev/null
-# @(#)Makefile 8.9 (Berkeley) 7/14/94
-
-LIBDB= libdb1.a
-ARCH=$(shell uname -m)
-ifeq ($(ARCH),alpha)
-SOVER=2.1
-else
-SOVER=2
-endif
-
-ifeq ($(OSARCH),Darwin)
- OSARCH_DEFINE+=-D__Darwin__
-endif
-
-LIBDBSO=libdb.so.$(SOVER)
-PROG= db_dump185
-OBJ1= hash/hash.o hash/hash_bigkey.o hash/hash_buf.o hash/hash_func.o hash/hash_log2.o hash/hash_page.o \
- hash/ndbm.o
-OBJ2= btree/bt_close.o btree/bt_conv.o btree/bt_debug.o btree/bt_delete.o btree/bt_get.o btree/bt_open.o \
- btree/bt_overflow.o btree/bt_page.o btree/bt_put.o btree/bt_search.o btree/bt_seq.o btree/bt_split.o \
- btree/bt_utils.o
-OBJ3= db/db.o
-OBJ4= mpool/mpool.o
-OBJ5= recno/rec_close.o recno/rec_delete.o recno/rec_get.o recno/rec_open.o recno/rec_put.o recno/rec_search.o \
- recno/rec_seq.o recno/rec_utils.o
-MISC=
-OBJS= $(OBJ1) $(OBJ2) $(OBJ3) $(OBJ4) $(OBJ5) $(MISC)
-SHOBJS= $(patsubst %.o,%.os,$(OBJS))
-
-include $(ASTTOPDIR)/Makefile.rules
-
-all: $(LIBDB) #$(LIBDBSO) $(PROG)
-
-$(LIBDB): $(OBJS)
- $(ECHO_PREFIX) echo " [AR] $^ -> $@"
- $(CMD_PREFIX) $(AR) cr $@ $^
- $(CMD_PREFIX) $(RANLIB) $@
-
-$(LIBDBSO): $(SHOBJS)
- $(CC) -Wl,-O1 -Wl,--version-script=libdb.map -Wl,-soname=$(LIBDBSO) -shared -o $@ $^
- ln -sf $@ libdb.so
-
-$(PROG): db_dump185.o $(LIBDBSO)
- $(CC) -o $@ db_dump185.o -L. -ldb
-
-clean-depend:
-
-clean:
- rm -f $(LIBDB) $(LIBDBSO) $(OBJS) $(SHOBJS) */*.s */*.i
-
-_ASTCFLAGS:=-Wall -D__DBINTERFACE_PRIVATE -I. -I.. -Iinclude -Ihash -Ibtree -Irecno $(_ASTCFLAGS)
-
-OSTYPE=$(shell uname -s)
-ifeq ($(OSTYPE),SunOS)
-_ASTCFLAGS+=-I../../include -I../../include/solaris-compat -DSOLARIS
-endif
-
-db_dump185.o: db_dump185.c
- $(CL) -o $@ $<
-x%.o: hash/%.c
- $(CL) -Ihash $(OSARCH_DEFINE) -o $@ $<
-%.os: hash/%.c
- $(CL) -Ihash -fPIC -o $@ $<
-x%.o: btree/%.c
- $(CL) -Ibtree -o $@ $<
-%.os: btree/%.c
- $(CL) -Ibtree -fPIC -o $@ $<
-x%.o: recno/%.c
- $(CL) -Irecno -o $@ $<
-%.os: recno/%.c
- $(CL) -Irecno -fPIC -o $@ $<
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Mike Olson.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)bt_close.c 8.7 (Berkeley) 8/17/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/param.h>
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "../include/db.h"
-#include "btree.h"
-
-static int bt_meta __P((BTREE *));
-
-/*
- * BT_CLOSE -- Close a btree.
- *
- * Parameters:
- * dbp: pointer to access method
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- */
-int
-__bt_close(dbp)
- DB *dbp;
-{
- BTREE *t;
- int fd;
-
- t = dbp->internal;
-
- /* Toss any page pinned across calls. */
- if (t->bt_pinned != NULL) {
- mpool_put(t->bt_mp, t->bt_pinned, 0);
- t->bt_pinned = NULL;
- }
-
- /* Sync the tree. */
- if (__bt_sync(dbp, 0) == RET_ERROR)
- return (RET_ERROR);
-
- /* Close the memory pool. */
- if (mpool_close(t->bt_mp) == RET_ERROR)
- return (RET_ERROR);
-
- /* Free random memory. */
- if (t->bt_cursor.key.data != NULL) {
- free(t->bt_cursor.key.data);
- t->bt_cursor.key.size = 0;
- t->bt_cursor.key.data = NULL;
- }
- if (t->bt_rkey.data) {
- free(t->bt_rkey.data);
- t->bt_rkey.size = 0;
- t->bt_rkey.data = NULL;
- }
- if (t->bt_rdata.data) {
- free(t->bt_rdata.data);
- t->bt_rdata.size = 0;
- t->bt_rdata.data = NULL;
- }
-
- fd = t->bt_fd;
- free(t);
- free(dbp);
- return (close(fd) ? RET_ERROR : RET_SUCCESS);
-}
-
-/*
- * BT_SYNC -- sync the btree to disk.
- *
- * Parameters:
- * dbp: pointer to access method
- *
- * Returns:
- * RET_SUCCESS, RET_ERROR.
- */
-int
-__bt_sync(dbp, flags)
- const DB *dbp;
- u_int flags;
-{
- BTREE *t;
- int status;
-
- t = dbp->internal;
-
- /* Toss any page pinned across calls. */
- if (t->bt_pinned != NULL) {
- mpool_put(t->bt_mp, t->bt_pinned, 0);
- t->bt_pinned = NULL;
- }
-
- /* Sync doesn't currently take any flags. */
- if (flags != 0) {
- errno = EINVAL;
- return (RET_ERROR);
- }
-
- if (F_ISSET(t, B_INMEM | B_RDONLY) || !F_ISSET(t, B_MODIFIED))
- return (RET_SUCCESS);
-
- if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR)
- return (RET_ERROR);
-
- if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS)
- F_CLR(t, B_MODIFIED);
-
- return (status);
-}
-
-/*
- * BT_META -- write the tree meta data to disk.
- *
- * Parameters:
- * t: tree
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- */
-static int
-bt_meta(t)
- BTREE *t;
-{
- BTMETA m;
- void *p;
-
- if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL)
- return (RET_ERROR);
-
- /* Fill in metadata. */
- m.magic = BTREEMAGIC;
- m.version = BTREEVERSION;
- m.psize = t->bt_psize;
- m.free = t->bt_free;
- m.nrecs = t->bt_nrecs;
- m.flags = F_ISSET(t, SAVEMETA);
-
- memmove(p, &m, sizeof(BTMETA));
- mpool_put(t->bt_mp, p, MPOOL_DIRTY);
- return (RET_SUCCESS);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Mike Olson.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)bt_conv.c 8.5 (Berkeley) 8/17/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/param.h>
-
-#include <stdio.h>
-
-#include "../include/db.h"
-#include "btree.h"
-
-static void mswap __P((PAGE *));
-
-/*
- * __BT_BPGIN, __BT_BPGOUT --
- * Convert host-specific number layout to/from the host-independent
- * format stored on disk.
- *
- * Parameters:
- * t: tree
- * pg: page number
- * h: page to convert
- */
-void
-__bt_pgin(t, pg, pp)
- void *t;
- pgno_t pg;
- void *pp;
-{
- PAGE *h;
- indx_t i, top;
- u_char flags;
- char *p;
-
- if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
- return;
- if (pg == P_META) {
- mswap(pp);
- return;
- }
-
- h = pp;
- M_32_SWAP(h->pgno);
- M_32_SWAP(h->prevpg);
- M_32_SWAP(h->nextpg);
- M_32_SWAP(h->flags);
- M_16_SWAP(h->lower);
- M_16_SWAP(h->upper);
-
- top = NEXTINDEX(h);
- if ((h->flags & P_TYPE) == P_BINTERNAL)
- for (i = 0; i < top; i++) {
- M_16_SWAP(h->linp[i]);
- p = (char *)GETBINTERNAL(h, i);
- P_32_SWAP(p);
- p += sizeof(u_int32_t);
- P_32_SWAP(p);
- p += sizeof(pgno_t);
- if (*(u_char *)p & P_BIGKEY) {
- p += sizeof(u_char);
- P_32_SWAP(p);
- p += sizeof(pgno_t);
- P_32_SWAP(p);
- }
- }
- else if ((h->flags & P_TYPE) == P_BLEAF)
- for (i = 0; i < top; i++) {
- M_16_SWAP(h->linp[i]);
- p = (char *)GETBLEAF(h, i);
- P_32_SWAP(p);
- p += sizeof(u_int32_t);
- P_32_SWAP(p);
- p += sizeof(u_int32_t);
- flags = *(u_char *)p;
- if (flags & (P_BIGKEY | P_BIGDATA)) {
- p += sizeof(u_char);
- if (flags & P_BIGKEY) {
- P_32_SWAP(p);
- p += sizeof(pgno_t);
- P_32_SWAP(p);
- }
- if (flags & P_BIGDATA) {
- p += sizeof(u_int32_t);
- P_32_SWAP(p);
- p += sizeof(pgno_t);
- P_32_SWAP(p);
- }
- }
- }
-}
-
-void
-__bt_pgout(t, pg, pp)
- void *t;
- pgno_t pg;
- void *pp;
-{
- PAGE *h;
- indx_t i, top;
- u_char flags;
- char *p;
-
- if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
- return;
- if (pg == P_META) {
- mswap(pp);
- return;
- }
-
- h = pp;
- top = NEXTINDEX(h);
- if ((h->flags & P_TYPE) == P_BINTERNAL)
- for (i = 0; i < top; i++) {
- p = (char *)GETBINTERNAL(h, i);
- P_32_SWAP(p);
- p += sizeof(u_int32_t);
- P_32_SWAP(p);
- p += sizeof(pgno_t);
- if (*(u_char *)p & P_BIGKEY) {
- p += sizeof(u_char);
- P_32_SWAP(p);
- p += sizeof(pgno_t);
- P_32_SWAP(p);
- }
- M_16_SWAP(h->linp[i]);
- }
- else if ((h->flags & P_TYPE) == P_BLEAF)
- for (i = 0; i < top; i++) {
- p = (char *)GETBLEAF(h, i);
- P_32_SWAP(p);
- p += sizeof(u_int32_t);
- P_32_SWAP(p);
- p += sizeof(u_int32_t);
- flags = *(u_char *)p;
- if (flags & (P_BIGKEY | P_BIGDATA)) {
- p += sizeof(u_char);
- if (flags & P_BIGKEY) {
- P_32_SWAP(p);
- p += sizeof(pgno_t);
- P_32_SWAP(p);
- }
- if (flags & P_BIGDATA) {
- p += sizeof(u_int32_t);
- P_32_SWAP(p);
- p += sizeof(pgno_t);
- P_32_SWAP(p);
- }
- }
- M_16_SWAP(h->linp[i]);
- }
-
- M_32_SWAP(h->pgno);
- M_32_SWAP(h->prevpg);
- M_32_SWAP(h->nextpg);
- M_32_SWAP(h->flags);
- M_16_SWAP(h->lower);
- M_16_SWAP(h->upper);
-}
-
-/*
- * MSWAP -- Actually swap the bytes on the meta page.
- *
- * Parameters:
- * p: page to convert
- */
-static void
-mswap(pg)
- PAGE *pg;
-{
- char *p;
-
- p = (char *)pg;
- P_32_SWAP(p); /* magic */
- p += sizeof(u_int32_t);
- P_32_SWAP(p); /* version */
- p += sizeof(u_int32_t);
- P_32_SWAP(p); /* psize */
- p += sizeof(u_int32_t);
- P_32_SWAP(p); /* free */
- p += sizeof(u_int32_t);
- P_32_SWAP(p); /* nrecs */
- p += sizeof(u_int32_t);
- P_32_SWAP(p); /* flags */
- p += sizeof(u_int32_t);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Mike Olson.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)bt_debug.c 8.5 (Berkeley) 8/17/94";
-#endif /* LIBC_SCCS and not lint */
-
-#ifdef DEBUG
-#include <sys/param.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "../include/db.h"
-#include "btree.h"
-
-/*
- * BT_DUMP -- Dump the tree
- *
- * Parameters:
- * dbp: pointer to the DB
- */
-void
-__bt_dump(dbp)
- DB *dbp;
-{
- BTREE *t;
- PAGE *h;
- pgno_t i;
- char *sep;
-
- t = dbp->internal;
- (void)fprintf(stderr, "%s: pgsz %d",
- F_ISSET(t, B_INMEM) ? "memory" : "disk", t->bt_psize);
- if (F_ISSET(t, R_RECNO))
- (void)fprintf(stderr, " keys %lu", t->bt_nrecs);
-#undef X
-#define X(flag, name) \
- if (F_ISSET(t, flag)) { \
- (void)fprintf(stderr, "%s%s", sep, name); \
- sep = ", "; \
- }
- if (t->flags != 0) {
- sep = " flags (";
- X(R_FIXLEN, "FIXLEN");
- X(B_INMEM, "INMEM");
- X(B_NODUPS, "NODUPS");
- X(B_RDONLY, "RDONLY");
- X(R_RECNO, "RECNO");
- X(B_METADIRTY,"METADIRTY");
- (void)fprintf(stderr, ")\n");
- }
-#undef X
-
- for (i = P_ROOT; (h = mpool_get(t->bt_mp, i, 0)) != NULL; ++i) {
- __bt_dpage(h);
- (void)mpool_put(t->bt_mp, h, 0);
- }
-}
-
-/*
- * BT_DMPAGE -- Dump the meta page
- *
- * Parameters:
- * h: pointer to the PAGE
- */
-void
-__bt_dmpage(h)
- PAGE *h;
-{
- BTMETA *m;
- char *sep;
-
- m = (BTMETA *)h;
- (void)fprintf(stderr, "magic %lx\n", m->magic);
- (void)fprintf(stderr, "version %lu\n", m->version);
- (void)fprintf(stderr, "psize %lu\n", m->psize);
- (void)fprintf(stderr, "free %lu\n", m->free);
- (void)fprintf(stderr, "nrecs %lu\n", m->nrecs);
- (void)fprintf(stderr, "flags %lu", m->flags);
-#undef X
-#define X(flag, name) \
- if (m->flags & flag) { \
- (void)fprintf(stderr, "%s%s", sep, name); \
- sep = ", "; \
- }
- if (m->flags) {
- sep = " (";
- X(B_NODUPS, "NODUPS");
- X(R_RECNO, "RECNO");
- (void)fprintf(stderr, ")");
- }
-}
-
-/*
- * BT_DNPAGE -- Dump the page
- *
- * Parameters:
- * n: page number to dump.
- */
-void
-__bt_dnpage(dbp, pgno)
- DB *dbp;
- pgno_t pgno;
-{
- BTREE *t;
- PAGE *h;
-
- t = dbp->internal;
- if ((h = mpool_get(t->bt_mp, pgno, 0)) != NULL) {
- __bt_dpage(h);
- (void)mpool_put(t->bt_mp, h, 0);
- }
-}
-
-/*
- * BT_DPAGE -- Dump the page
- *
- * Parameters:
- * h: pointer to the PAGE
- */
-void
-__bt_dpage(h)
- PAGE *h;
-{
- BINTERNAL *bi;
- BLEAF *bl;
- RINTERNAL *ri;
- RLEAF *rl;
- indx_t cur, top;
- char *sep;
-
- (void)fprintf(stderr, " page %d: (", h->pgno);
-#undef X
-#define X(flag, name) \
- if (h->flags & flag) { \
- (void)fprintf(stderr, "%s%s", sep, name); \
- sep = ", "; \
- }
- sep = "";
- X(P_BINTERNAL, "BINTERNAL") /* types */
- X(P_BLEAF, "BLEAF")
- X(P_RINTERNAL, "RINTERNAL") /* types */
- X(P_RLEAF, "RLEAF")
- X(P_OVERFLOW, "OVERFLOW")
- X(P_PRESERVE, "PRESERVE");
- (void)fprintf(stderr, ")\n");
-#undef X
-
- (void)fprintf(stderr, "\tprev %2d next %2d", h->prevpg, h->nextpg);
- if (h->flags & P_OVERFLOW)
- return;
-
- top = NEXTINDEX(h);
- (void)fprintf(stderr, " lower %3d upper %3d nextind %d\n",
- h->lower, h->upper, top);
- for (cur = 0; cur < top; cur++) {
- (void)fprintf(stderr, "\t[%03d] %4d ", cur, h->linp[cur]);
- switch (h->flags & P_TYPE) {
- case P_BINTERNAL:
- bi = GETBINTERNAL(h, cur);
- (void)fprintf(stderr,
- "size %03d pgno %03d", bi->ksize, bi->pgno);
- if (bi->flags & P_BIGKEY)
- (void)fprintf(stderr, " (indirect)");
- else if (bi->ksize)
- (void)fprintf(stderr,
- " {%.*s}", (int)bi->ksize, bi->bytes);
- break;
- case P_RINTERNAL:
- ri = GETRINTERNAL(h, cur);
- (void)fprintf(stderr, "entries %03d pgno %03d",
- ri->nrecs, ri->pgno);
- break;
- case P_BLEAF:
- bl = GETBLEAF(h, cur);
- if (bl->flags & P_BIGKEY)
- (void)fprintf(stderr,
- "big key page %lu size %u/",
- *(pgno_t *)bl->bytes,
- *(u_int32_t *)(bl->bytes + sizeof(pgno_t)));
- else if (bl->ksize)
- (void)fprintf(stderr, "%s/", bl->bytes);
- if (bl->flags & P_BIGDATA)
- (void)fprintf(stderr,
- "big data page %lu size %u",
- *(pgno_t *)(bl->bytes + bl->ksize),
- *(u_int32_t *)(bl->bytes + bl->ksize +
- sizeof(pgno_t)));
- else if (bl->dsize)
- (void)fprintf(stderr, "%.*s",
- (int)bl->dsize, bl->bytes + bl->ksize);
- break;
- case P_RLEAF:
- rl = GETRLEAF(h, cur);
- if (rl->flags & P_BIGDATA)
- (void)fprintf(stderr,
- "big data page %lu size %u",
- *(pgno_t *)rl->bytes,
- *(u_int32_t *)(rl->bytes + sizeof(pgno_t)));
- else if (rl->dsize)
- (void)fprintf(stderr,
- "%.*s", (int)rl->dsize, rl->bytes);
- break;
- }
- (void)fprintf(stderr, "\n");
- }
-}
-#endif
-
-#ifdef STATISTICS
-/*
- * BT_STAT -- Gather/print the tree statistics
- *
- * Parameters:
- * dbp: pointer to the DB
- */
-void
-__bt_stat(dbp)
- DB *dbp;
-{
- extern u_long bt_cache_hit, bt_cache_miss, bt_pfxsaved, bt_rootsplit;
- extern u_long bt_sortsplit, bt_split;
- BTREE *t;
- PAGE *h;
- pgno_t i, pcont, pinternal, pleaf;
- u_long ifree, lfree, nkeys;
- int levels;
-
- t = dbp->internal;
- pcont = pinternal = pleaf = 0;
- nkeys = ifree = lfree = 0;
- for (i = P_ROOT; (h = mpool_get(t->bt_mp, i, 0)) != NULL; ++i) {
- switch (h->flags & P_TYPE) {
- case P_BINTERNAL:
- case P_RINTERNAL:
- ++pinternal;
- ifree += h->upper - h->lower;
- break;
- case P_BLEAF:
- case P_RLEAF:
- ++pleaf;
- lfree += h->upper - h->lower;
- nkeys += NEXTINDEX(h);
- break;
- case P_OVERFLOW:
- ++pcont;
- break;
- }
- (void)mpool_put(t->bt_mp, h, 0);
- }
-
- /* Count the levels of the tree. */
- for (i = P_ROOT, levels = 0 ;; ++levels) {
- h = mpool_get(t->bt_mp, i, 0);
- if (h->flags & (P_BLEAF|P_RLEAF)) {
- if (levels == 0)
- levels = 1;
- (void)mpool_put(t->bt_mp, h, 0);
- break;
- }
- i = F_ISSET(t, R_RECNO) ?
- GETRINTERNAL(h, 0)->pgno :
- GETBINTERNAL(h, 0)->pgno;
- (void)mpool_put(t->bt_mp, h, 0);
- }
-
- (void)fprintf(stderr, "%d level%s with %ld keys",
- levels, levels == 1 ? "" : "s", nkeys);
- if (F_ISSET(t, R_RECNO))
- (void)fprintf(stderr, " (%ld header count)", t->bt_nrecs);
- (void)fprintf(stderr,
- "\n%lu pages (leaf %ld, internal %ld, overflow %ld)\n",
- pinternal + pleaf + pcont, pleaf, pinternal, pcont);
- (void)fprintf(stderr, "%ld cache hits, %ld cache misses\n",
- bt_cache_hit, bt_cache_miss);
- (void)fprintf(stderr, "%ld splits (%ld root splits, %ld sort splits)\n",
- bt_split, bt_rootsplit, bt_sortsplit);
- pleaf *= t->bt_psize - BTDATAOFF;
- if (pleaf)
- (void)fprintf(stderr,
- "%.0f%% leaf fill (%ld bytes used, %ld bytes free)\n",
- ((double)(pleaf - lfree) / pleaf) * 100,
- pleaf - lfree, lfree);
- pinternal *= t->bt_psize - BTDATAOFF;
- if (pinternal)
- (void)fprintf(stderr,
- "%.0f%% internal fill (%ld bytes used, %ld bytes free\n",
- ((double)(pinternal - ifree) / pinternal) * 100,
- pinternal - ifree, ifree);
- if (bt_pfxsaved)
- (void)fprintf(stderr, "prefix checking removed %lu bytes.\n",
- bt_pfxsaved);
-}
-#endif
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Mike Olson.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)bt_delete.c 8.13 (Berkeley) 7/28/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <errno.h>
-#include <stdio.h>
-#include <string.h>
-
-#include "../include/db.h"
-#include "btree.h"
-
-static int __bt_bdelete __P((BTREE *, const DBT *));
-static int __bt_curdel __P((BTREE *, const DBT *, PAGE *, u_int));
-static int __bt_pdelete __P((BTREE *, PAGE *));
-static int __bt_relink __P((BTREE *, PAGE *));
-static int __bt_stkacq __P((BTREE *, PAGE **, CURSOR *));
-
-/*
- * __bt_delete
- * Delete the item(s) referenced by a key.
- *
- * Return RET_SPECIAL if the key is not found.
- */
-int
-__bt_delete(dbp, key, flags)
- const DB *dbp;
- const DBT *key;
- u_int flags;
-{
- BTREE *t;
- CURSOR *c;
- PAGE *h;
- int status;
-
- t = dbp->internal;
-
- /* Toss any page pinned across calls. */
- if (t->bt_pinned != NULL) {
- mpool_put(t->bt_mp, t->bt_pinned, 0);
- t->bt_pinned = NULL;
- }
-
- /* Check for change to a read-only tree. */
- if (F_ISSET(t, B_RDONLY)) {
- errno = EPERM;
- return (RET_ERROR);
- }
-
- switch (flags) {
- case 0:
- status = __bt_bdelete(t, key);
- break;
- case R_CURSOR:
- /*
- * If flags is R_CURSOR, delete the cursor. Must already
- * have started a scan and not have already deleted it.
- */
- c = &t->bt_cursor;
- if (F_ISSET(c, CURS_INIT)) {
- if (F_ISSET(c, CURS_ACQUIRE | CURS_AFTER | CURS_BEFORE))
- return (RET_SPECIAL);
- if ((h = mpool_get(t->bt_mp, c->pg.pgno, 0)) == NULL)
- return (RET_ERROR);
-
- /*
- * If the page is about to be emptied, we'll need to
- * delete it, which means we have to acquire a stack.
- */
- if (NEXTINDEX(h) == 1)
- if (__bt_stkacq(t, &h, &t->bt_cursor))
- return (RET_ERROR);
-
- status = __bt_dleaf(t, NULL, h, c->pg.index);
-
- if (NEXTINDEX(h) == 0 && status == RET_SUCCESS) {
- if (__bt_pdelete(t, h))
- return (RET_ERROR);
- } else
- mpool_put(t->bt_mp,
- h, status == RET_SUCCESS ? MPOOL_DIRTY : 0);
- break;
- }
- /* FALLTHROUGH */
- default:
- errno = EINVAL;
- return (RET_ERROR);
- }
- if (status == RET_SUCCESS)
- F_SET(t, B_MODIFIED);
- return (status);
-}
-
-/*
- * __bt_stkacq --
- * Acquire a stack so we can delete a cursor entry.
- *
- * Parameters:
- * t: tree
- * hp: pointer to current, pinned PAGE pointer
- * c: pointer to the cursor
- *
- * Returns:
- * 0 on success, 1 on failure
- */
-static int
-__bt_stkacq(t, hp, c)
- BTREE *t;
- PAGE **hp;
- CURSOR *c;
-{
- BINTERNAL *bi;
- EPG *e;
- EPGNO *parent;
- PAGE *h;
- indx_t idx = 0;
- pgno_t pgno;
- recno_t nextpg, prevpg;
- int exact, level;
-
- /*
- * Find the first occurrence of the key in the tree. Toss the
- * currently locked page so we don't hit an already-locked page.
- */
- h = *hp;
- mpool_put(t->bt_mp, h, 0);
- if ((e = __bt_search(t, &c->key, &exact)) == NULL)
- return (1);
- h = e->page;
-
- /* See if we got it in one shot. */
- if (h->pgno == c->pg.pgno)
- goto ret;
-
- /*
- * Move right, looking for the page. At each move we have to move
- * up the stack until we don't have to move to the next page. If
- * we have to change pages at an internal level, we have to fix the
- * stack back up.
- */
- while (h->pgno != c->pg.pgno) {
- if ((nextpg = h->nextpg) == P_INVALID)
- break;
- mpool_put(t->bt_mp, h, 0);
-
- /* Move up the stack. */
- for (level = 0; (parent = BT_POP(t)) != NULL; ++level) {
- /* Get the parent page. */
- if ((h = mpool_get(t->bt_mp, parent->pgno, 0)) == NULL)
- return (1);
-
- /* Move to the next index. */
- if (parent->index != NEXTINDEX(h) - 1) {
- idx = parent->index + 1;
- BT_PUSH(t, h->pgno, idx);
- break;
- }
- mpool_put(t->bt_mp, h, 0);
- }
-
- /* Restore the stack. */
- while (level--) {
- /* Push the next level down onto the stack. */
- bi = GETBINTERNAL(h, idx);
- pgno = bi->pgno;
- BT_PUSH(t, pgno, 0);
-
- /* Lose the currently pinned page. */
- mpool_put(t->bt_mp, h, 0);
-
- /* Get the next level down. */
- if ((h = mpool_get(t->bt_mp, pgno, 0)) == NULL)
- return (1);
- idx = 0;
- }
- mpool_put(t->bt_mp, h, 0);
- if ((h = mpool_get(t->bt_mp, nextpg, 0)) == NULL)
- return (1);
- }
-
- if (h->pgno == c->pg.pgno)
- goto ret;
-
- /* Reacquire the original stack. */
- mpool_put(t->bt_mp, h, 0);
- if ((e = __bt_search(t, &c->key, &exact)) == NULL)
- return (1);
- h = e->page;
-
- /*
- * Move left, looking for the page. At each move we have to move
- * up the stack until we don't have to change pages to move to the
- * next page. If we have to change pages at an internal level, we
- * have to fix the stack back up.
- */
- while (h->pgno != c->pg.pgno) {
- if ((prevpg = h->prevpg) == P_INVALID)
- break;
- mpool_put(t->bt_mp, h, 0);
-
- /* Move up the stack. */
- for (level = 0; (parent = BT_POP(t)) != NULL; ++level) {
- /* Get the parent page. */
- if ((h = mpool_get(t->bt_mp, parent->pgno, 0)) == NULL)
- return (1);
-
- /* Move to the next index. */
- if (parent->index != 0) {
- idx = parent->index - 1;
- BT_PUSH(t, h->pgno, idx);
- break;
- }
- mpool_put(t->bt_mp, h, 0);
- }
-
- /* Restore the stack. */
- while (level--) {
- /* Push the next level down onto the stack. */
- bi = GETBINTERNAL(h, idx);
- pgno = bi->pgno;
-
- /* Lose the currently pinned page. */
- mpool_put(t->bt_mp, h, 0);
-
- /* Get the next level down. */
- if ((h = mpool_get(t->bt_mp, pgno, 0)) == NULL)
- return (1);
-
- idx = NEXTINDEX(h) - 1;
- BT_PUSH(t, pgno, idx);
- }
- mpool_put(t->bt_mp, h, 0);
- if ((h = mpool_get(t->bt_mp, prevpg, 0)) == NULL)
- return (1);
- }
-
-
-ret: mpool_put(t->bt_mp, h, 0);
- return ((*hp = mpool_get(t->bt_mp, c->pg.pgno, 0)) == NULL);
-}
-
-/*
- * __bt_bdelete --
- * Delete all key/data pairs matching the specified key.
- *
- * Parameters:
- * t: tree
- * key: key to delete
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
- */
-static int
-__bt_bdelete(t, key)
- BTREE *t;
- const DBT *key;
-{
- EPG *e;
- PAGE *h;
- int deleted, exact, redo;
-
- deleted = 0;
-
- /* Find any matching record; __bt_search pins the page. */
-loop: if ((e = __bt_search(t, key, &exact)) == NULL)
- return (deleted ? RET_SUCCESS : RET_ERROR);
- if (!exact) {
- mpool_put(t->bt_mp, e->page, 0);
- return (deleted ? RET_SUCCESS : RET_SPECIAL);
- }
-
- /*
- * Delete forward, then delete backward, from the found key. If
- * there are duplicates and we reach either side of the page, do
- * the key search again, so that we get them all.
- */
- redo = 0;
- h = e->page;
- do {
- if (__bt_dleaf(t, key, h, e->index)) {
- mpool_put(t->bt_mp, h, 0);
- return (RET_ERROR);
- }
- if (F_ISSET(t, B_NODUPS)) {
- if (NEXTINDEX(h) == 0) {
- if (__bt_pdelete(t, h))
- return (RET_ERROR);
- } else
- mpool_put(t->bt_mp, h, MPOOL_DIRTY);
- return (RET_SUCCESS);
- }
- deleted = 1;
- } while (e->index < NEXTINDEX(h) && __bt_cmp(t, key, e) == 0);
-
- /* Check for right-hand edge of the page. */
- if (e->index == NEXTINDEX(h))
- redo = 1;
-
- /* Delete from the key to the beginning of the page. */
- while (e->index-- > 0) {
- if (__bt_cmp(t, key, e) != 0)
- break;
- if (__bt_dleaf(t, key, h, e->index) == RET_ERROR) {
- mpool_put(t->bt_mp, h, 0);
- return (RET_ERROR);
- }
- if (e->index == 0)
- redo = 1;
- }
-
- /* Check for an empty page. */
- if (NEXTINDEX(h) == 0) {
- if (__bt_pdelete(t, h))
- return (RET_ERROR);
- goto loop;
- }
-
- /* Put the page. */
- mpool_put(t->bt_mp, h, MPOOL_DIRTY);
-
- if (redo)
- goto loop;
- return (RET_SUCCESS);
-}
-
-/*
- * __bt_pdelete --
- * Delete a single page from the tree.
- *
- * Parameters:
- * t: tree
- * h: leaf page
- *
- * Returns:
- * RET_SUCCESS, RET_ERROR.
- *
- * Side-effects:
- * mpool_put's the page
- */
-static int
-__bt_pdelete(t, h)
- BTREE *t;
- PAGE *h;
-{
- BINTERNAL *bi;
- PAGE *pg;
- EPGNO *parent;
- indx_t cnt, idx, *ip, offset;
- u_int32_t nksize;
- char *from;
-
- /*
- * Walk the parent page stack -- a LIFO stack of the pages that were
- * traversed when we searched for the page where the delete occurred.
- * Each stack entry is a page number and a page index offset. The
- * offset is for the page traversed on the search. We've just deleted
- * a page, so we have to delete the key from the parent page.
- *
- * If the delete from the parent page makes it empty, this process may
- * continue all the way up the tree. We stop if we reach the root page
- * (which is never deleted, it's just not worth the effort) or if the
- * delete does not empty the page.
- */
- while ((parent = BT_POP(t)) != NULL) {
- /* Get the parent page. */
- if ((pg = mpool_get(t->bt_mp, parent->pgno, 0)) == NULL)
- return (RET_ERROR);
-
- idx = parent->index;
- bi = GETBINTERNAL(pg, idx);
-
- /* Free any overflow pages. */
- if (bi->flags & P_BIGKEY &&
- __ovfl_delete(t, bi->bytes) == RET_ERROR) {
- mpool_put(t->bt_mp, pg, 0);
- return (RET_ERROR);
- }
-
- /*
- * Free the parent if it has only the one key and it's not the
- * root page. If it's the rootpage, turn it back into an empty
- * leaf page.
- */
- if (NEXTINDEX(pg) == 1) {
- if (pg->pgno == P_ROOT) {
- pg->lower = BTDATAOFF;
- pg->upper = t->bt_psize;
- pg->flags = P_BLEAF;
- } else {
- if (__bt_relink(t, pg) || __bt_free(t, pg))
- return (RET_ERROR);
- continue;
- }
- } else {
- /* Pack remaining key items at the end of the page. */
- nksize = NBINTERNAL(bi->ksize);
- from = (char *)pg + pg->upper;
- memmove(from + nksize, from, (char *)bi - from);
- pg->upper += nksize;
-
- /* Adjust indices' offsets, shift the indices down. */
- offset = pg->linp[idx];
- for (cnt = idx, ip = &pg->linp[0]; cnt--; ++ip)
- if (ip[0] < offset)
- ip[0] += nksize;
- for (cnt = NEXTINDEX(pg) - idx; --cnt; ++ip)
- ip[0] = ip[1] < offset ? ip[1] + nksize : ip[1];
- pg->lower -= sizeof(indx_t);
- }
-
- mpool_put(t->bt_mp, pg, MPOOL_DIRTY);
- break;
- }
-
- /* Free the leaf page, as long as it wasn't the root. */
- if (h->pgno == P_ROOT) {
- mpool_put(t->bt_mp, h, MPOOL_DIRTY);
- return (RET_SUCCESS);
- }
- return (__bt_relink(t, h) || __bt_free(t, h));
-}
-
-/*
- * __bt_dleaf --
- * Delete a single record from a leaf page.
- *
- * Parameters:
- * t: tree
- * key: referenced key
- * h: page
- * index: index on page to delete
- *
- * Returns:
- * RET_SUCCESS, RET_ERROR.
- */
-int
-__bt_dleaf(t, key, h, idx)
- BTREE *t;
- const DBT *key;
- PAGE *h;
- u_int idx;
-{
- BLEAF *bl;
- indx_t cnt, *ip, offset;
- u_int32_t nbytes;
- void *to;
- char *from;
-
- /* If this record is referenced by the cursor, delete the cursor. */
- if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
- !F_ISSET(&t->bt_cursor, CURS_ACQUIRE) &&
- t->bt_cursor.pg.pgno == h->pgno && t->bt_cursor.pg.index == idx &&
- __bt_curdel(t, key, h, idx))
- return (RET_ERROR);
-
- /* If the entry uses overflow pages, make them available for reuse. */
- to = bl = GETBLEAF(h, idx);
- if (bl->flags & P_BIGKEY && __ovfl_delete(t, bl->bytes) == RET_ERROR)
- return (RET_ERROR);
- if (bl->flags & P_BIGDATA &&
- __ovfl_delete(t, bl->bytes + bl->ksize) == RET_ERROR)
- return (RET_ERROR);
-
- /* Pack the remaining key/data items at the end of the page. */
- nbytes = NBLEAF(bl);
- from = (char *)h + h->upper;
- memmove(from + nbytes, from, (char *)to - from);
- h->upper += nbytes;
-
- /* Adjust the indices' offsets, shift the indices down. */
- offset = h->linp[idx];
- for (cnt = idx, ip = &h->linp[0]; cnt--; ++ip)
- if (ip[0] < offset)
- ip[0] += nbytes;
- for (cnt = NEXTINDEX(h) - idx; --cnt; ++ip)
- ip[0] = ip[1] < offset ? ip[1] + nbytes : ip[1];
- h->lower -= sizeof(indx_t);
-
- /* If the cursor is on this page, adjust it as necessary. */
- if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
- !F_ISSET(&t->bt_cursor, CURS_ACQUIRE) &&
- t->bt_cursor.pg.pgno == h->pgno && t->bt_cursor.pg.index > idx)
- --t->bt_cursor.pg.index;
-
- return (RET_SUCCESS);
-}
-
-/*
- * __bt_curdel --
- * Delete the cursor.
- *
- * Parameters:
- * t: tree
- * key: referenced key (or NULL)
- * h: page
- * index: index on page to delete
- *
- * Returns:
- * RET_SUCCESS, RET_ERROR.
- */
-static int
-__bt_curdel(t, key, h, idx)
- BTREE *t;
- const DBT *key;
- PAGE *h;
- u_int idx;
-{
- CURSOR *c;
- EPG e;
- PAGE *pg;
- int curcopy, status;
-
- /*
- * If there are duplicates, move forward or backward to one.
- * Otherwise, copy the key into the cursor area.
- */
- c = &t->bt_cursor;
- F_CLR(c, CURS_AFTER | CURS_BEFORE | CURS_ACQUIRE);
-
- curcopy = 0;
- if (!F_ISSET(t, B_NODUPS)) {
- /*
- * We're going to have to do comparisons. If we weren't
- * provided a copy of the key, i.e. the user is deleting
- * the current cursor position, get one.
- */
- if (key == NULL) {
- e.page = h;
- e.index = idx;
- if ((status = __bt_ret(t, &e,
- &c->key, &c->key, NULL, NULL, 1)) != RET_SUCCESS)
- return (status);
- curcopy = 1;
- key = &c->key;
- }
- /* Check previous key, if not at the beginning of the page. */
- if (idx > 0) {
- e.page = h;
- e.index = idx - 1;
- if (__bt_cmp(t, key, &e) == 0) {
- F_SET(c, CURS_BEFORE);
- goto dup2;
- }
- }
- /* Check next key, if not at the end of the page. */
- if (idx < NEXTINDEX(h) - 1) {
- e.page = h;
- e.index = idx + 1;
- if (__bt_cmp(t, key, &e) == 0) {
- F_SET(c, CURS_AFTER);
- goto dup2;
- }
- }
- /* Check previous key if at the beginning of the page. */
- if (idx == 0 && h->prevpg != P_INVALID) {
- if ((pg = mpool_get(t->bt_mp, h->prevpg, 0)) == NULL)
- return (RET_ERROR);
- e.page = pg;
- e.index = NEXTINDEX(pg) - 1;
- if (__bt_cmp(t, key, &e) == 0) {
- F_SET(c, CURS_BEFORE);
- goto dup1;
- }
- mpool_put(t->bt_mp, pg, 0);
- }
- /* Check next key if at the end of the page. */
- if (idx == NEXTINDEX(h) - 1 && h->nextpg != P_INVALID) {
- if ((pg = mpool_get(t->bt_mp, h->nextpg, 0)) == NULL)
- return (RET_ERROR);
- e.page = pg;
- e.index = 0;
- if (__bt_cmp(t, key, &e) == 0) {
- F_SET(c, CURS_AFTER);
-dup1: mpool_put(t->bt_mp, pg, 0);
-dup2: c->pg.pgno = e.page->pgno;
- c->pg.index = e.index;
- return (RET_SUCCESS);
- }
- mpool_put(t->bt_mp, pg, 0);
- }
- }
- e.page = h;
- e.index = idx;
- if (curcopy || (status =
- __bt_ret(t, &e, &c->key, &c->key, NULL, NULL, 1)) == RET_SUCCESS) {
- F_SET(c, CURS_ACQUIRE);
- return (RET_SUCCESS);
- }
- return (status);
-}
-
-/*
- * __bt_relink --
- * Link around a deleted page.
- *
- * Parameters:
- * t: tree
- * h: page to be deleted
- */
-static int
-__bt_relink(t, h)
- BTREE *t;
- PAGE *h;
-{
- PAGE *pg;
-
- if (h->nextpg != P_INVALID) {
- if ((pg = mpool_get(t->bt_mp, h->nextpg, 0)) == NULL)
- return (RET_ERROR);
- pg->prevpg = h->prevpg;
- mpool_put(t->bt_mp, pg, MPOOL_DIRTY);
- }
- if (h->prevpg != P_INVALID) {
- if ((pg = mpool_get(t->bt_mp, h->prevpg, 0)) == NULL)
- return (RET_ERROR);
- pg->nextpg = h->nextpg;
- mpool_put(t->bt_mp, pg, MPOOL_DIRTY);
- }
- return (0);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Mike Olson.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)bt_get.c 8.6 (Berkeley) 7/20/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <errno.h>
-#include <stddef.h>
-#include <stdio.h>
-
-#include "../include/db.h"
-#include "btree.h"
-
-/*
- * __BT_GET -- Get a record from the btree.
- *
- * Parameters:
- * dbp: pointer to access method
- * key: key to find
- * data: data to return
- * flag: currently unused
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
- */
-int
-__bt_get(dbp, key, data, flags)
- const DB *dbp;
- const DBT *key;
- DBT *data;
- u_int flags;
-{
- BTREE *t;
- EPG *e;
- int exact, status;
-
- t = dbp->internal;
-
- /* Toss any page pinned across calls. */
- if (t->bt_pinned != NULL) {
- mpool_put(t->bt_mp, t->bt_pinned, 0);
- t->bt_pinned = NULL;
- }
-
- /* Get currently doesn't take any flags. */
- if (flags) {
- errno = EINVAL;
- return (RET_ERROR);
- }
-
- if ((e = __bt_search(t, key, &exact)) == NULL)
- return (RET_ERROR);
- if (!exact) {
- mpool_put(t->bt_mp, e->page, 0);
- return (RET_SPECIAL);
- }
-
- status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0);
-
- /*
- * If the user is doing concurrent access, we copied the
- * key/data, toss the page.
- */
- if (F_ISSET(t, B_DB_LOCK))
- mpool_put(t->bt_mp, e->page, 0);
- else
- t->bt_pinned = e->page;
- return (status);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Mike Olson.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)bt_open.c 8.10 (Berkeley) 8/17/94";
-#endif /* LIBC_SCCS and not lint */
-
-/*
- * Implementation of btree access method for 4.4BSD.
- *
- * The design here was originally based on that of the btree access method
- * used in the Postgres database system at UC Berkeley. This implementation
- * is wholly independent of the Postgres code.
- */
-
-#include <sys/param.h>
-#include <sys/stat.h>
-
-#include <errno.h>
-#include <fcntl.h>
-#include <limits.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "../include/db.h"
-#include "btree.h"
-
-#ifdef DEBUG
-#undef MINPSIZE
-#define MINPSIZE 128
-#endif
-
-static int byteorder __P((void));
-static int nroot __P((BTREE *));
-static int tmp __P((void));
-
-/*
- * __BT_OPEN -- Open a btree.
- *
- * Creates and fills a DB struct, and calls the routine that actually
- * opens the btree.
- *
- * Parameters:
- * fname: filename (NULL for in-memory trees)
- * flags: open flag bits
- * mode: open permission bits
- * b: BTREEINFO pointer
- *
- * Returns:
- * NULL on failure, pointer to DB on success.
- *
- */
-DB *
-__bt_open(fname, flags, mode, openinfo, dflags)
- const char *fname;
- int flags, mode, dflags;
- const BTREEINFO *openinfo;
-{
- struct stat sb;
- BTMETA m;
- BTREE *t;
- BTREEINFO b;
- DB *dbp;
- pgno_t ncache;
- ssize_t nr;
- int machine_lorder;
-
- t = NULL;
-
- /*
- * Intention is to make sure all of the user's selections are okay
- * here and then use them without checking. Can't be complete, since
- * we don't know the right page size, lorder or flags until the backing
- * file is opened. Also, the file's page size can cause the cachesize
- * to change.
- */
- machine_lorder = byteorder();
- if (openinfo) {
- b = *openinfo;
-
- /* Flags: R_DUP. */
- if (b.flags & ~(R_DUP))
- goto einval;
-
- /*
- * Page size must be indx_t aligned and >= MINPSIZE. Default
- * page size is set farther on, based on the underlying file
- * transfer size.
- */
- if (b.psize &&
- (b.psize < MINPSIZE || b.psize > MAX_PAGE_OFFSET + 1 ||
- b.psize & (sizeof(indx_t) - 1)))
- goto einval;
-
- /* Minimum number of keys per page; absolute minimum is 2. */
- if (b.minkeypage) {
- if (b.minkeypage < 2)
- goto einval;
- } else
- b.minkeypage = DEFMINKEYPAGE;
-
- /* If no comparison, use default comparison and prefix. */
- if (b.compare == NULL) {
- b.compare = __bt_defcmp;
- if (b.prefix == NULL)
- b.prefix = __bt_defpfx;
- }
-
- if (b.lorder == 0)
- b.lorder = machine_lorder;
- } else {
- b.compare = __bt_defcmp;
- b.cachesize = 0;
- b.flags = 0;
- b.lorder = machine_lorder;
- b.minkeypage = DEFMINKEYPAGE;
- b.prefix = __bt_defpfx;
- b.psize = 0;
- }
-
- /* Check for the ubiquitous PDP-11. */
- if (b.lorder != BIG_ENDIAN && b.lorder != LITTLE_ENDIAN)
- goto einval;
-
- /* Allocate and initialize DB and BTREE structures. */
- if ((t = (BTREE *)malloc(sizeof(BTREE))) == NULL)
- goto err;
- memset(t, 0, sizeof(BTREE));
- t->bt_fd = -1; /* Don't close unopened fd on error. */
- t->bt_lorder = b.lorder;
- t->bt_order = NOT;
- t->bt_cmp = b.compare;
- t->bt_pfx = b.prefix;
- t->bt_rfd = -1;
-
- if ((t->bt_dbp = dbp = (DB *)malloc(sizeof(DB))) == NULL)
- goto err;
- memset(t->bt_dbp, 0, sizeof(DB));
- if (t->bt_lorder != machine_lorder)
- F_SET(t, B_NEEDSWAP);
-
- dbp->type = DB_BTREE;
- dbp->internal = t;
- dbp->close = __bt_close;
- dbp->del = __bt_delete;
- dbp->fd = __bt_fd;
- dbp->get = __bt_get;
- dbp->put = __bt_put;
- dbp->seq = __bt_seq;
- dbp->sync = __bt_sync;
-
- /*
- * If no file name was supplied, this is an in-memory btree and we
- * open a backing temporary file. Otherwise, it's a disk-based tree.
- */
- if (fname) {
- switch (flags & O_ACCMODE) {
- case O_RDONLY:
- F_SET(t, B_RDONLY);
- break;
- case O_RDWR:
- break;
- case O_WRONLY:
- default:
- goto einval;
- }
-
- if ((t->bt_fd = open(fname, flags, mode)) < 0)
- goto err;
-
- } else {
- if ((flags & O_ACCMODE) != O_RDWR)
- goto einval;
- if ((t->bt_fd = tmp()) == -1)
- goto err;
- F_SET(t, B_INMEM);
- }
-
- if (fcntl(t->bt_fd, F_SETFD, 1) == -1)
- goto err;
-
- if (fstat(t->bt_fd, &sb))
- goto err;
- if (sb.st_size) {
- if ((nr = read(t->bt_fd, &m, sizeof(BTMETA))) < 0)
- goto err;
- if (nr != sizeof(BTMETA))
- goto eftype;
-
- /*
- * Read in the meta-data. This can change the notion of what
- * the lorder, page size and flags are, and, when the page size
- * changes, the cachesize value can change too. If the user
- * specified the wrong byte order for an existing database, we
- * don't bother to return an error, we just clear the NEEDSWAP
- * bit.
- */
- if (m.magic == BTREEMAGIC)
- F_CLR(t, B_NEEDSWAP);
- else {
- F_SET(t, B_NEEDSWAP);
- M_32_SWAP(m.magic);
- M_32_SWAP(m.version);
- M_32_SWAP(m.psize);
- M_32_SWAP(m.free);
- M_32_SWAP(m.nrecs);
- M_32_SWAP(m.flags);
- }
- if (m.magic != BTREEMAGIC || m.version != BTREEVERSION)
- goto eftype;
- if (m.psize < MINPSIZE || m.psize > MAX_PAGE_OFFSET + 1 ||
- m.psize & (sizeof(indx_t) - 1))
- goto eftype;
- if (m.flags & ~SAVEMETA)
- goto eftype;
- b.psize = m.psize;
- F_SET(t, m.flags);
- t->bt_free = m.free;
- t->bt_nrecs = m.nrecs;
- } else {
- /*
- * Set the page size to the best value for I/O to this file.
- * Don't overflow the page offset type.
- */
- if (b.psize == 0) {
-#ifdef _STATBUF_ST_BLKSIZE
- b.psize = sb.st_blksize;
-#endif
- if (b.psize < MINPSIZE)
- b.psize = MINPSIZE;
- if (b.psize > MAX_PAGE_OFFSET + 1)
- b.psize = MAX_PAGE_OFFSET + 1;
- }
-
- /* Set flag if duplicates permitted. */
- if (!(b.flags & R_DUP))
- F_SET(t, B_NODUPS);
-
- t->bt_free = P_INVALID;
- t->bt_nrecs = 0;
- F_SET(t, B_METADIRTY);
- }
-
- t->bt_psize = b.psize;
-
- /* Set the cache size; must be a multiple of the page size. */
- if (b.cachesize && b.cachesize & (b.psize - 1))
- b.cachesize += (~b.cachesize & (b.psize - 1)) + 1;
- if (b.cachesize < b.psize * MINCACHE)
- b.cachesize = b.psize * MINCACHE;
-
- /* Calculate number of pages to cache. */
- ncache = (b.cachesize + t->bt_psize - 1) / t->bt_psize;
-
- /*
- * The btree data structure requires that at least two keys can fit on
- * a page, but other than that there's no fixed requirement. The user
- * specified a minimum number per page, and we translated that into the
- * number of bytes a key/data pair can use before being placed on an
- * overflow page. This calculation includes the page header, the size
- * of the index referencing the leaf item and the size of the leaf item
- * structure. Also, don't let the user specify a minkeypage such that
- * a key/data pair won't fit even if both key and data are on overflow
- * pages.
- */
- t->bt_ovflsize = (t->bt_psize - BTDATAOFF) / b.minkeypage -
- (sizeof(indx_t) + NBLEAFDBT(0, 0));
- if (t->bt_ovflsize < NBLEAFDBT(NOVFLSIZE, NOVFLSIZE) + sizeof(indx_t))
- t->bt_ovflsize =
- NBLEAFDBT(NOVFLSIZE, NOVFLSIZE) + sizeof(indx_t);
-
- /* Initialize the buffer pool. */
- if ((t->bt_mp =
- mpool_open(NULL, t->bt_fd, t->bt_psize, ncache)) == NULL)
- goto err;
- if (!F_ISSET(t, B_INMEM))
- mpool_filter(t->bt_mp, __bt_pgin, __bt_pgout, t);
-
- /* Create a root page if new tree. */
- if (nroot(t) == RET_ERROR)
- goto err;
-
- /* Global flags. */
- if (dflags & DB_LOCK)
- F_SET(t, B_DB_LOCK);
- if (dflags & DB_SHMEM)
- F_SET(t, B_DB_SHMEM);
- if (dflags & DB_TXN)
- F_SET(t, B_DB_TXN);
-
- return (dbp);
-
-einval: errno = EINVAL;
- goto err;
-
-eftype: errno = EFTYPE;
- goto err;
-
-err: if (t) {
- if (t->bt_dbp)
- free(t->bt_dbp);
- if (t->bt_fd != -1)
- (void)close(t->bt_fd);
- free(t);
- }
- return (NULL);
-}
-
-/*
- * NROOT -- Create the root of a new tree.
- *
- * Parameters:
- * t: tree
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- */
-static int
-nroot(t)
- BTREE *t;
-{
- PAGE *meta, *root;
- pgno_t npg;
-
- if ((meta = mpool_get(t->bt_mp, 0, 0)) != NULL) {
- mpool_put(t->bt_mp, meta, 0);
- return (RET_SUCCESS);
- }
- if (errno != EINVAL) /* It's OK to not exist. */
- return (RET_ERROR);
- errno = 0;
-
- if ((meta = mpool_new(t->bt_mp, &npg)) == NULL)
- return (RET_ERROR);
-
- if ((root = mpool_new(t->bt_mp, &npg)) == NULL)
- return (RET_ERROR);
-
- if (npg != P_ROOT)
- return (RET_ERROR);
- root->pgno = npg;
- root->prevpg = root->nextpg = P_INVALID;
- root->lower = BTDATAOFF;
- root->upper = t->bt_psize;
- root->flags = P_BLEAF;
- memset(meta, 0, t->bt_psize);
- mpool_put(t->bt_mp, meta, MPOOL_DIRTY);
- mpool_put(t->bt_mp, root, MPOOL_DIRTY);
- return (RET_SUCCESS);
-}
-
-static int
-tmp()
-{
- sigset_t set, oset;
- int fd;
- const char *envtmp;
- char *path;
- static const char fmt[] = "%s/bt.XXXXXX";
- size_t n;
-
- envtmp = getenv("TMPDIR");
- if (!envtmp)
- envtmp = "/tmp";
- n = strlen (envtmp) + sizeof fmt;
-#ifdef __GNUC__
- path = __builtin_alloca(n);
-#else
- path = malloc(n);
-#endif
- (void)snprintf(path, n, fmt, envtmp ? envtmp : "/tmp");
-
- (void)sigfillset(&set);
- (void)sigprocmask(SIG_BLOCK, &set, &oset);
- if ((fd = mkstemp(path)) != -1)
- (void)unlink(path);
- (void)sigprocmask(SIG_SETMASK, &oset, NULL);
-#ifndef __GNUC__
- free(path);
-#endif
- return(fd);
-}
-
-static int
-byteorder()
-{
- u_int32_t x;
- u_char *p;
-
- x = 0x01020304;
- p = (u_char *)&x;
- switch (*p) {
- case 1:
- return (BIG_ENDIAN);
- case 4:
- return (LITTLE_ENDIAN);
- default:
- return (0);
- }
-}
-
-int
-__bt_fd(dbp)
- const DB *dbp;
-{
- BTREE *t;
-
- t = dbp->internal;
-
- /* Toss any page pinned across calls. */
- if (t->bt_pinned != NULL) {
- mpool_put(t->bt_mp, t->bt_pinned, 0);
- t->bt_pinned = NULL;
- }
-
- /* In-memory database can't have a file descriptor. */
- if (F_ISSET(t, B_INMEM)) {
- errno = ENOENT;
- return (-1);
- }
- return (t->bt_fd);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Mike Olson.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)bt_overflow.c 8.5 (Berkeley) 7/16/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/param.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "../include/db.h"
-#include "btree.h"
-
-/*
- * Big key/data code.
- *
- * Big key and data entries are stored on linked lists of pages. The initial
- * reference is byte string stored with the key or data and is the page number
- * and size. The actual record is stored in a chain of pages linked by the
- * nextpg field of the PAGE header.
- *
- * The first page of the chain has a special property. If the record is used
- * by an internal page, it cannot be deleted and the P_PRESERVE bit will be set
- * in the header.
- *
- * XXX
- * A single DBT is written to each chain, so a lot of space on the last page
- * is wasted. This is a fairly major bug for some data sets.
- */
-
-/*
- * __OVFL_GET -- Get an overflow key/data item.
- *
- * Parameters:
- * t: tree
- * p: pointer to { pgno_t, u_int32_t }
- * buf: storage address
- * bufsz: storage size
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- */
-int
-__ovfl_get(t, p, ssz, buf, bufsz)
- BTREE *t;
- void *p;
- size_t *ssz;
- void **buf;
- size_t *bufsz;
-{
- PAGE *h;
- pgno_t pg;
- size_t nb, plen;
- u_int32_t sz;
-
- memmove(&pg, p, sizeof(pgno_t));
- memmove(&sz, (char *)p + sizeof(pgno_t), sizeof(u_int32_t));
- *ssz = sz;
-
-#ifdef DEBUG
- if (pg == P_INVALID || sz == 0)
- abort();
-#endif
- /* Make the buffer bigger as necessary. */
- if (*bufsz < sz) {
- *buf = (char *)(*buf == NULL ? malloc(sz) : realloc(*buf, sz));
- if (*buf == NULL)
- return (RET_ERROR);
- *bufsz = sz;
- }
-
- /*
- * Step through the linked list of pages, copying the data on each one
- * into the buffer. Never copy more than the data's length.
- */
- plen = t->bt_psize - BTDATAOFF;
- for (p = *buf;; p = (char *)p + nb, pg = h->nextpg) {
- if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
- return (RET_ERROR);
-
- nb = MIN(sz, plen);
- memmove(p, (char *)h + BTDATAOFF, nb);
- mpool_put(t->bt_mp, h, 0);
-
- if ((sz -= nb) == 0)
- break;
- }
- return (RET_SUCCESS);
-}
-
-/*
- * __OVFL_PUT -- Store an overflow key/data item.
- *
- * Parameters:
- * t: tree
- * data: DBT to store
- * pgno: storage page number
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- */
-int
-__ovfl_put(t, dbt, pg)
- BTREE *t;
- const DBT *dbt;
- pgno_t *pg;
-{
- PAGE *h, *last;
- void *p;
- pgno_t npg;
- size_t nb, plen;
- u_int32_t sz;
-
- /*
- * Allocate pages and copy the key/data record into them. Store the
- * number of the first page in the chain.
- */
- plen = t->bt_psize - BTDATAOFF;
- for (last = NULL, p = dbt->data, sz = dbt->size;;
- p = (char *)p + plen, last = h) {
- if ((h = __bt_new(t, &npg)) == NULL)
- return (RET_ERROR);
-
- h->pgno = npg;
- h->nextpg = h->prevpg = P_INVALID;
- h->flags = P_OVERFLOW;
- h->lower = h->upper = 0;
-
- nb = MIN(sz, plen);
- memmove((char *)h + BTDATAOFF, p, nb);
-
- if (last) {
- last->nextpg = h->pgno;
- mpool_put(t->bt_mp, last, MPOOL_DIRTY);
- } else
- *pg = h->pgno;
-
- if ((sz -= nb) == 0) {
- mpool_put(t->bt_mp, h, MPOOL_DIRTY);
- break;
- }
- }
- return (RET_SUCCESS);
-}
-
-/*
- * __OVFL_DELETE -- Delete an overflow chain.
- *
- * Parameters:
- * t: tree
- * p: pointer to { pgno_t, u_int32_t }
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- */
-int
-__ovfl_delete(t, p)
- BTREE *t;
- void *p;
-{
- PAGE *h;
- pgno_t pg;
- size_t plen;
- u_int32_t sz;
-
- memmove(&pg, p, sizeof(pgno_t));
- memmove(&sz, (char *)p + sizeof(pgno_t), sizeof(u_int32_t));
-
-#ifdef DEBUG
- if (pg == P_INVALID || sz == 0)
- abort();
-#endif
- if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
- return (RET_ERROR);
-
- /* Don't delete chains used by internal pages. */
- if (h->flags & P_PRESERVE) {
- mpool_put(t->bt_mp, h, 0);
- return (RET_SUCCESS);
- }
-
- /* Step through the chain, calling the free routine for each page. */
- for (plen = t->bt_psize - BTDATAOFF;; sz -= plen) {
- pg = h->nextpg;
- __bt_free(t, h);
- if (sz <= plen)
- break;
- if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
- return (RET_ERROR);
- }
- return (RET_SUCCESS);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)bt_page.c 8.3 (Berkeley) 7/14/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <stdio.h>
-
-#include "../include/db.h"
-#include "btree.h"
-
-/*
- * __bt_free --
- * Put a page on the freelist.
- *
- * Parameters:
- * t: tree
- * h: page to free
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- *
- * Side-effect:
- * mpool_put's the page.
- */
-int
-__bt_free(t, h)
- BTREE *t;
- PAGE *h;
-{
- /* Insert the page at the head of the free list. */
- h->prevpg = P_INVALID;
- h->nextpg = t->bt_free;
- t->bt_free = h->pgno;
- F_SET(t, B_METADIRTY);
-
- /* Make sure the page gets written back. */
- return (mpool_put(t->bt_mp, h, MPOOL_DIRTY));
-}
-
-/*
- * __bt_new --
- * Get a new page, preferably from the freelist.
- *
- * Parameters:
- * t: tree
- * npg: storage for page number.
- *
- * Returns:
- * Pointer to a page, NULL on error.
- */
-PAGE *
-__bt_new(t, npg)
- BTREE *t;
- pgno_t *npg;
-{
- PAGE *h;
-
- if (t->bt_free != P_INVALID &&
- (h = mpool_get(t->bt_mp, t->bt_free, 0)) != NULL) {
- *npg = t->bt_free;
- t->bt_free = h->nextpg;
- F_SET(t, B_METADIRTY);
- return (h);
- }
- return (mpool_new(t->bt_mp, npg));
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Mike Olson.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)bt_put.c 8.8 (Berkeley) 7/26/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "../include/db.h"
-#include "btree.h"
-
-static EPG *bt_fast __P((BTREE *, const DBT *, const DBT *, int *));
-
-/*
- * __BT_PUT -- Add a btree item to the tree.
- *
- * Parameters:
- * dbp: pointer to access method
- * key: key
- * data: data
- * flag: R_NOOVERWRITE
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key is already in the
- * tree and R_NOOVERWRITE specified.
- */
-int
-__bt_put(dbp, key, data, flags)
- const DB *dbp;
- DBT *key;
- const DBT *data;
- u_int flags;
-{
- BTREE *t;
- DBT tkey, tdata;
- EPG *e = 0;
- PAGE *h;
- indx_t idx, nxtindex;
- pgno_t pg;
- u_int32_t nbytes;
- int dflags, exact, status;
- char *dest, db[NOVFLSIZE], kb[NOVFLSIZE];
-
- t = dbp->internal;
-
- /* Toss any page pinned across calls. */
- if (t->bt_pinned != NULL) {
- mpool_put(t->bt_mp, t->bt_pinned, 0);
- t->bt_pinned = NULL;
- }
-
- /* Check for change to a read-only tree. */
- if (F_ISSET(t, B_RDONLY)) {
- errno = EPERM;
- return (RET_ERROR);
- }
-
- switch (flags) {
- case 0:
- case R_NOOVERWRITE:
- break;
- case R_CURSOR:
- /*
- * If flags is R_CURSOR, put the cursor. Must already
- * have started a scan and not have already deleted it.
- */
- if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
- !F_ISSET(&t->bt_cursor,
- CURS_ACQUIRE | CURS_AFTER | CURS_BEFORE))
- break;
- /* FALLTHROUGH */
- default:
- errno = EINVAL;
- return (RET_ERROR);
- }
-
- /*
- * If the key/data pair won't fit on a page, store it on overflow
- * pages. Only put the key on the overflow page if the pair are
- * still too big after moving the data to an overflow page.
- *
- * XXX
- * If the insert fails later on, the overflow pages aren't recovered.
- */
- dflags = 0;
- if (key->size + data->size > t->bt_ovflsize) {
- if (key->size > t->bt_ovflsize) {
-storekey: if (__ovfl_put(t, key, &pg) == RET_ERROR)
- return (RET_ERROR);
- tkey.data = kb;
- tkey.size = NOVFLSIZE;
- memmove(kb, &pg, sizeof(pgno_t));
- memmove(kb + sizeof(pgno_t),
- &key->size, sizeof(u_int32_t));
- dflags |= P_BIGKEY;
- key = &tkey;
- }
- if (key->size + data->size > t->bt_ovflsize) {
- if (__ovfl_put(t, data, &pg) == RET_ERROR)
- return (RET_ERROR);
- tdata.data = db;
- tdata.size = NOVFLSIZE;
- memmove(db, &pg, sizeof(pgno_t));
- memmove(db + sizeof(pgno_t),
- &data->size, sizeof(u_int32_t));
- dflags |= P_BIGDATA;
- data = &tdata;
- }
- if (key->size + data->size > t->bt_ovflsize)
- goto storekey;
- }
-
- /* Replace the cursor. */
- if (flags == R_CURSOR) {
- if ((h = mpool_get(t->bt_mp, t->bt_cursor.pg.pgno, 0)) == NULL)
- return (RET_ERROR);
- idx = t->bt_cursor.pg.index;
- goto delete;
- }
-
- /*
- * Find the key to delete, or, the location at which to insert.
- * Bt_fast and __bt_search both pin the returned page.
- */
- if (t->bt_order == NOT || (e = bt_fast(t, key, data, &exact)) == NULL)
- if ((e = __bt_search(t, key, &exact)) == NULL)
- return (RET_ERROR);
- h = e->page;
- idx = e->index;
-
- /*
- * Add the key/data pair to the tree. If an identical key is already
- * in the tree, and R_NOOVERWRITE is set, an error is returned. If
- * R_NOOVERWRITE is not set, the key is either added (if duplicates are
- * permitted) or an error is returned.
- */
- switch (flags) {
- case R_NOOVERWRITE:
- if (!exact)
- break;
- mpool_put(t->bt_mp, h, 0);
- return (RET_SPECIAL);
- default:
- if (!exact || !F_ISSET(t, B_NODUPS))
- break;
- /*
- * !!!
- * Note, the delete may empty the page, so we need to put a
- * new entry into the page immediately.
- */
-delete: if (__bt_dleaf(t, key, h, idx) == RET_ERROR) {
- mpool_put(t->bt_mp, h, 0);
- return (RET_ERROR);
- }
- break;
- }
-
- /*
- * If not enough room, or the user has put a ceiling on the number of
- * keys permitted in the page, split the page. The split code will
- * insert the key and data and unpin the current page. If inserting
- * into the offset array, shift the pointers up.
- */
- nbytes = NBLEAFDBT(key->size, data->size);
- if ((u_int32_t) (h->upper - h->lower) < nbytes + sizeof(indx_t)) {
- if ((status = __bt_split(t, h, key,
- data, dflags, nbytes, idx)) != RET_SUCCESS)
- return (status);
- goto success;
- }
-
- if (idx < (nxtindex = NEXTINDEX(h)))
- memmove(h->linp + idx + 1, h->linp + idx,
- (nxtindex - idx) * sizeof(indx_t));
- h->lower += sizeof(indx_t);
-
- h->linp[idx] = h->upper -= nbytes;
- dest = (char *)h + h->upper;
- WR_BLEAF(dest, key, data, dflags);
-
- /* If the cursor is on this page, adjust it as necessary. */
- if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
- !F_ISSET(&t->bt_cursor, CURS_ACQUIRE) &&
- t->bt_cursor.pg.pgno == h->pgno && t->bt_cursor.pg.index >= idx)
- ++t->bt_cursor.pg.index;
-
- if (t->bt_order == NOT) {
- if (h->nextpg == P_INVALID) {
- if (idx == NEXTINDEX(h) - 1) {
- t->bt_order = FORWARD;
- t->bt_last.index = idx;
- t->bt_last.pgno = h->pgno;
- }
- } else if (h->prevpg == P_INVALID) {
- if (idx == 0) {
- t->bt_order = BACK;
- t->bt_last.index = 0;
- t->bt_last.pgno = h->pgno;
- }
- }
- }
-
- mpool_put(t->bt_mp, h, MPOOL_DIRTY);
-
-success:
- if (flags == R_SETCURSOR)
- __bt_setcur(t, e->page->pgno, e->index);
-
- F_SET(t, B_MODIFIED);
- return (RET_SUCCESS);
-}
-
-#ifdef STATISTICS
-u_long bt_cache_hit, bt_cache_miss;
-#endif
-
-/*
- * BT_FAST -- Do a quick check for sorted data.
- *
- * Parameters:
- * t: tree
- * key: key to insert
- *
- * Returns:
- * EPG for new record or NULL if not found.
- */
-static EPG *
-bt_fast(t, key, data, exactp)
- BTREE *t;
- const DBT *key, *data;
- int *exactp;
-{
- PAGE *h;
- u_int32_t nbytes;
- int cmp;
-
- if ((h = mpool_get(t->bt_mp, t->bt_last.pgno, 0)) == NULL) {
- t->bt_order = NOT;
- return (NULL);
- }
- t->bt_cur.page = h;
- t->bt_cur.index = t->bt_last.index;
-
- /*
- * If won't fit in this page or have too many keys in this page,
- * have to search to get split stack.
- */
- nbytes = NBLEAFDBT(key->size, data->size);
- if ((u_int32_t) (h->upper - h->lower) < nbytes + sizeof(indx_t))
- goto miss;
-
- if (t->bt_order == FORWARD) {
- if (t->bt_cur.page->nextpg != P_INVALID)
- goto miss;
- if (t->bt_cur.index != NEXTINDEX(h) - 1)
- goto miss;
- if ((cmp = __bt_cmp(t, key, &t->bt_cur)) < 0)
- goto miss;
- t->bt_last.index = cmp ? ++t->bt_cur.index : t->bt_cur.index;
- } else {
- if (t->bt_cur.page->prevpg != P_INVALID)
- goto miss;
- if (t->bt_cur.index != 0)
- goto miss;
- if ((cmp = __bt_cmp(t, key, &t->bt_cur)) > 0)
- goto miss;
- t->bt_last.index = 0;
- }
- *exactp = cmp == 0;
-#ifdef STATISTICS
- ++bt_cache_hit;
-#endif
- return (&t->bt_cur);
-
-miss:
-#ifdef STATISTICS
- ++bt_cache_miss;
-#endif
- t->bt_order = NOT;
- mpool_put(t->bt_mp, h, 0);
- return (NULL);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Mike Olson.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)bt_search.c 8.8 (Berkeley) 7/31/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <stdio.h>
-
-#include "../include/db.h"
-#include "btree.h"
-
-static int __bt_snext __P((BTREE *, PAGE *, const DBT *, int *));
-static int __bt_sprev __P((BTREE *, PAGE *, const DBT *, int *));
-
-/*
- * __bt_search --
- * Search a btree for a key.
- *
- * Parameters:
- * t: tree to search
- * key: key to find
- * exactp: pointer to exact match flag
- *
- * Returns:
- * The EPG for matching record, if any, or the EPG for the location
- * of the key, if it were inserted into the tree, is entered into
- * the bt_cur field of the tree. A pointer to the field is returned.
- */
-EPG *
-__bt_search(t, key, exactp)
- BTREE *t;
- const DBT *key;
- int *exactp;
-{
- PAGE *h;
- indx_t base, index, lim;
- pgno_t pg;
- int cmp;
-
- BT_CLR(t);
- for (pg = P_ROOT;;) {
- if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
- return (NULL);
-
- /* Do a binary search on the current page. */
- t->bt_cur.page = h;
- for (base = 0, lim = NEXTINDEX(h); lim; lim >>= 1) {
- t->bt_cur.index = index = base + (lim >> 1);
- if ((cmp = __bt_cmp(t, key, &t->bt_cur)) == 0) {
- if (h->flags & P_BLEAF) {
- *exactp = 1;
- return (&t->bt_cur);
- }
- goto next;
- }
- if (cmp > 0) {
- base = index + 1;
- --lim;
- }
- }
-
- /*
- * If it's a leaf page, we're almost done. If no duplicates
- * are allowed, or we have an exact match, we're done. Else,
- * it's possible that there were matching keys on this page,
- * which later deleted, and we're on a page with no matches
- * while there are matches on other pages. If at the start or
- * end of a page, check the adjacent page.
- */
- if (h->flags & P_BLEAF) {
- if (!F_ISSET(t, B_NODUPS)) {
- if (base == 0 &&
- h->prevpg != P_INVALID &&
- __bt_sprev(t, h, key, exactp))
- return (&t->bt_cur);
- if (base == NEXTINDEX(h) &&
- h->nextpg != P_INVALID &&
- __bt_snext(t, h, key, exactp))
- return (&t->bt_cur);
- }
- *exactp = 0;
- t->bt_cur.index = base;
- return (&t->bt_cur);
- }
-
- /*
- * No match found. Base is the smallest index greater than
- * key and may be zero or a last + 1 index. If it's non-zero,
- * decrement by one, and record the internal page which should
- * be a parent page for the key. If a split later occurs, the
- * inserted page will be to the right of the saved page.
- */
- index = base ? base - 1 : base;
-
-next: BT_PUSH(t, h->pgno, index);
- pg = GETBINTERNAL(h, index)->pgno;
- mpool_put(t->bt_mp, h, 0);
- }
-}
-
-/*
- * __bt_snext --
- * Check for an exact match after the key.
- *
- * Parameters:
- * t: tree
- * h: current page
- * key: key
- * exactp: pointer to exact match flag
- *
- * Returns:
- * If an exact match found.
- */
-static int
-__bt_snext(t, h, key, exactp)
- BTREE *t;
- PAGE *h;
- const DBT *key;
- int *exactp;
-{
- EPG e;
-
- /*
- * Get the next page. The key is either an exact
- * match, or not as good as the one we already have.
- */
- if ((e.page = mpool_get(t->bt_mp, h->nextpg, 0)) == NULL)
- return (0);
- e.index = 0;
- if (__bt_cmp(t, key, &e) == 0) {
- mpool_put(t->bt_mp, h, 0);
- t->bt_cur = e;
- *exactp = 1;
- return (1);
- }
- mpool_put(t->bt_mp, e.page, 0);
- return (0);
-}
-
-/*
- * __bt_sprev --
- * Check for an exact match before the key.
- *
- * Parameters:
- * t: tree
- * h: current page
- * key: key
- * exactp: pointer to exact match flag
- *
- * Returns:
- * If an exact match found.
- */
-static int
-__bt_sprev(t, h, key, exactp)
- BTREE *t;
- PAGE *h;
- const DBT *key;
- int *exactp;
-{
- EPG e;
-
- /*
- * Get the previous page. The key is either an exact
- * match, or not as good as the one we already have.
- */
- if ((e.page = mpool_get(t->bt_mp, h->prevpg, 0)) == NULL)
- return (0);
- e.index = NEXTINDEX(e.page) - 1;
- if (__bt_cmp(t, key, &e) == 0) {
- mpool_put(t->bt_mp, h, 0);
- t->bt_cur = e;
- *exactp = 1;
- return (1);
- }
- mpool_put(t->bt_mp, e.page, 0);
- return (0);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Mike Olson.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)bt_seq.c 8.7 (Berkeley) 7/20/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <errno.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "../include/db.h"
-#include "btree.h"
-
-static int __bt_first __P((BTREE *, const DBT *, EPG *, int *));
-static int __bt_seqadv __P((BTREE *, EPG *, int));
-static int __bt_seqset __P((BTREE *, EPG *, DBT *, int));
-
-/*
- * Sequential scan support.
- *
- * The tree can be scanned sequentially, starting from either end of the
- * tree or from any specific key. A scan request before any scanning is
- * done is initialized as starting from the least node.
- */
-
-/*
- * __bt_seq --
- * Btree sequential scan interface.
- *
- * Parameters:
- * dbp: pointer to access method
- * key: key for positioning and return value
- * data: data return value
- * flags: R_CURSOR, R_FIRST, R_LAST, R_NEXT, R_PREV.
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS or RET_SPECIAL if there's no next key.
- */
-int
-__bt_seq(dbp, key, data, flags)
- const DB *dbp;
- DBT *key, *data;
- u_int flags;
-{
- BTREE *t;
- EPG e;
- int status;
-
- t = dbp->internal;
-
- /* Toss any page pinned across calls. */
- if (t->bt_pinned != NULL) {
- mpool_put(t->bt_mp, t->bt_pinned, 0);
- t->bt_pinned = NULL;
- }
-
- /*
- * If scan uninitialized as yet, or starting at a specific record, set
- * the scan to a specific key. Both __bt_seqset and __bt_seqadv pin
- * the page the cursor references if they're successful.
- */
- switch (flags) {
- case R_NEXT:
- case R_PREV:
- if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
- status = __bt_seqadv(t, &e, flags);
- break;
- }
- /* FALLTHROUGH */
- case R_FIRST:
- case R_LAST:
- case R_CURSOR:
- status = __bt_seqset(t, &e, key, flags);
- break;
- default:
- errno = EINVAL;
- return (RET_ERROR);
- }
-
- if (status == RET_SUCCESS) {
- __bt_setcur(t, e.page->pgno, e.index);
-
- status =
- __bt_ret(t, &e, key, &t->bt_rkey, data, &t->bt_rdata, 0);
-
- /*
- * If the user is doing concurrent access, we copied the
- * key/data, toss the page.
- */
- if (F_ISSET(t, B_DB_LOCK))
- mpool_put(t->bt_mp, e.page, 0);
- else
- t->bt_pinned = e.page;
- }
- return (status);
-}
-
-/*
- * __bt_seqset --
- * Set the sequential scan to a specific key.
- *
- * Parameters:
- * t: tree
- * ep: storage for returned key
- * key: key for initial scan position
- * flags: R_CURSOR, R_FIRST, R_LAST, R_NEXT, R_PREV
- *
- * Side effects:
- * Pins the page the cursor references.
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS or RET_SPECIAL if there's no next key.
- */
-static int
-__bt_seqset(t, ep, key, flags)
- BTREE *t;
- EPG *ep;
- DBT *key;
- int flags;
-{
- PAGE *h;
- pgno_t pg;
- int exact;
-
- /*
- * Find the first, last or specific key in the tree and point the
- * cursor at it. The cursor may not be moved until a new key has
- * been found.
- */
- switch (flags) {
- case R_CURSOR: /* Keyed scan. */
- /*
- * Find the first instance of the key or the smallest key
- * which is greater than or equal to the specified key.
- */
- if (key->data == NULL || key->size == 0) {
- errno = EINVAL;
- return (RET_ERROR);
- }
- return (__bt_first(t, key, ep, &exact));
- case R_FIRST: /* First record. */
- case R_NEXT:
- /* Walk down the left-hand side of the tree. */
- for (pg = P_ROOT;;) {
- if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
- return (RET_ERROR);
-
- /* Check for an empty tree. */
- if (NEXTINDEX(h) == 0) {
- mpool_put(t->bt_mp, h, 0);
- return (RET_SPECIAL);
- }
-
- if (h->flags & (P_BLEAF | P_RLEAF))
- break;
- pg = GETBINTERNAL(h, 0)->pgno;
- mpool_put(t->bt_mp, h, 0);
- }
- ep->page = h;
- ep->index = 0;
- break;
- case R_LAST: /* Last record. */
- case R_PREV:
- /* Walk down the right-hand side of the tree. */
- for (pg = P_ROOT;;) {
- if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
- return (RET_ERROR);
-
- /* Check for an empty tree. */
- if (NEXTINDEX(h) == 0) {
- mpool_put(t->bt_mp, h, 0);
- return (RET_SPECIAL);
- }
-
- if (h->flags & (P_BLEAF | P_RLEAF))
- break;
- pg = GETBINTERNAL(h, NEXTINDEX(h) - 1)->pgno;
- mpool_put(t->bt_mp, h, 0);
- }
-
- ep->page = h;
- ep->index = NEXTINDEX(h) - 1;
- break;
- }
- return (RET_SUCCESS);
-}
-
-/*
- * __bt_seqadvance --
- * Advance the sequential scan.
- *
- * Parameters:
- * t: tree
- * flags: R_NEXT, R_PREV
- *
- * Side effects:
- * Pins the page the new key/data record is on.
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS or RET_SPECIAL if there's no next key.
- */
-static int
-__bt_seqadv(t, ep, flags)
- BTREE *t;
- EPG *ep;
- int flags;
-{
- CURSOR *c;
- PAGE *h;
- indx_t index = 0;
- pgno_t pg;
- int exact;
-
- /*
- * There are a couple of states that we can be in. The cursor has
- * been initialized by the time we get here, but that's all we know.
- */
- c = &t->bt_cursor;
-
- /*
- * The cursor was deleted where there weren't any duplicate records,
- * so the key was saved. Find out where that key would go in the
- * current tree. It doesn't matter if the returned key is an exact
- * match or not -- if it's an exact match, the record was added after
- * the delete so we can just return it. If not, as long as there's
- * a record there, return it.
- */
- if (F_ISSET(c, CURS_ACQUIRE))
- return (__bt_first(t, &c->key, ep, &exact));
-
- /* Get the page referenced by the cursor. */
- if ((h = mpool_get(t->bt_mp, c->pg.pgno, 0)) == NULL)
- return (RET_ERROR);
-
- /*
- * Find the next/previous record in the tree and point the cursor at
- * it. The cursor may not be moved until a new key has been found.
- */
- switch (flags) {
- case R_NEXT: /* Next record. */
- /*
- * The cursor was deleted in duplicate records, and moved
- * forward to a record that has yet to be returned. Clear
- * that flag, and return the record.
- */
- if (F_ISSET(c, CURS_AFTER))
- goto usecurrent;
- index = c->pg.index;
- if (++index == NEXTINDEX(h)) {
- pg = h->nextpg;
- mpool_put(t->bt_mp, h, 0);
- if (pg == P_INVALID)
- return (RET_SPECIAL);
- if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
- return (RET_ERROR);
- index = 0;
- }
- break;
- case R_PREV: /* Previous record. */
- /*
- * The cursor was deleted in duplicate records, and moved
- * backward to a record that has yet to be returned. Clear
- * that flag, and return the record.
- */
- if (F_ISSET(c, CURS_BEFORE)) {
-usecurrent: F_CLR(c, CURS_AFTER | CURS_BEFORE);
- ep->page = h;
- ep->index = c->pg.index;
- return (RET_SUCCESS);
- }
- index = c->pg.index;
- if (index == 0) {
- pg = h->prevpg;
- mpool_put(t->bt_mp, h, 0);
- if (pg == P_INVALID)
- return (RET_SPECIAL);
- if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
- return (RET_ERROR);
- index = NEXTINDEX(h) - 1;
- } else
- --index;
- break;
- }
-
- ep->page = h;
- ep->index = index;
- return (RET_SUCCESS);
-}
-
-/*
- * __bt_first --
- * Find the first entry.
- *
- * Parameters:
- * t: the tree
- * key: the key
- * erval: return EPG
- * exactp: pointer to exact match flag
- *
- * Returns:
- * The first entry in the tree greater than or equal to key,
- * or RET_SPECIAL if no such key exists.
- */
-static int
-__bt_first(t, key, erval, exactp)
- BTREE *t;
- const DBT *key;
- EPG *erval;
- int *exactp;
-{
- PAGE *h;
- EPG *ep, save;
- pgno_t pg;
-
- /*
- * Find any matching record; __bt_search pins the page.
- *
- * If it's an exact match and duplicates are possible, walk backwards
- * in the tree until we find the first one. Otherwise, make sure it's
- * a valid key (__bt_search may return an index just past the end of a
- * page) and return it.
- */
- if ((ep = __bt_search(t, key, exactp)) == NULL)
- return (RET_SPECIAL);
- if (*exactp) {
- if (F_ISSET(t, B_NODUPS)) {
- *erval = *ep;
- return (RET_SUCCESS);
- }
-
- /*
- * Walk backwards, as long as the entry matches and there are
- * keys left in the tree. Save a copy of each match in case
- * we go too far.
- */
- save = *ep;
- h = ep->page;
- do {
- if (save.page->pgno != ep->page->pgno) {
- mpool_put(t->bt_mp, save.page, 0);
- save = *ep;
- } else
- save.index = ep->index;
-
- /*
- * Don't unpin the page the last (or original) match
- * was on, but make sure it's unpinned if an error
- * occurs.
- */
- if (ep->index == 0) {
- if (h->prevpg == P_INVALID)
- break;
- if (h->pgno != save.page->pgno)
- mpool_put(t->bt_mp, h, 0);
- if ((h = mpool_get(t->bt_mp,
- h->prevpg, 0)) == NULL) {
- if (h->pgno == save.page->pgno)
- mpool_put(t->bt_mp,
- save.page, 0);
- return (RET_ERROR);
- }
- ep->page = h;
- ep->index = NEXTINDEX(h);
- }
- --ep->index;
- } while (__bt_cmp(t, key, ep) == 0);
-
- /*
- * Reach here with the last page that was looked at pinned,
- * which may or may not be the same as the last (or original)
- * match page. If it's not useful, release it.
- */
- if (h->pgno != save.page->pgno)
- mpool_put(t->bt_mp, h, 0);
-
- *erval = save;
- return (RET_SUCCESS);
- }
-
- /* If at the end of a page, find the next entry. */
- if (ep->index == NEXTINDEX(ep->page)) {
- h = ep->page;
- pg = h->nextpg;
- mpool_put(t->bt_mp, h, 0);
- if (pg == P_INVALID)
- return (RET_SPECIAL);
- if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
- return (RET_ERROR);
- ep->index = 0;
- ep->page = h;
- }
- *erval = *ep;
- return (RET_SUCCESS);
-}
-
-/*
- * __bt_setcur --
- * Set the cursor to an entry in the tree.
- *
- * Parameters:
- * t: the tree
- * pgno: page number
- * index: page index
- */
-void
-__bt_setcur(t, pgno, index)
- BTREE *t;
- pgno_t pgno;
- u_int index;
-{
- /* Lose any already deleted key. */
- if (t->bt_cursor.key.data != NULL) {
- free(t->bt_cursor.key.data);
- t->bt_cursor.key.size = 0;
- t->bt_cursor.key.data = NULL;
- }
- F_CLR(&t->bt_cursor, CURS_ACQUIRE | CURS_AFTER | CURS_BEFORE);
-
- /* Update the cursor. */
- t->bt_cursor.pg.pgno = pgno;
- t->bt_cursor.pg.index = index;
- F_SET(&t->bt_cursor, CURS_INIT);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Mike Olson.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)bt_split.c 8.9 (Berkeley) 7/26/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "../include/db.h"
-#include "btree.h"
-
-static int bt_broot __P((BTREE *, PAGE *, PAGE *, PAGE *));
-static PAGE *bt_page
- __P((BTREE *, PAGE *, PAGE **, PAGE **, indx_t *, size_t));
-static int bt_preserve __P((BTREE *, pgno_t));
-static PAGE *bt_psplit
- __P((BTREE *, PAGE *, PAGE *, PAGE *, indx_t *, size_t));
-static PAGE *bt_root
- __P((BTREE *, PAGE *, PAGE **, PAGE **, indx_t *, size_t));
-static int bt_rroot __P((BTREE *, PAGE *, PAGE *, PAGE *));
-static recno_t rec_total __P((PAGE *));
-
-#ifdef STATISTICS
-u_long bt_rootsplit, bt_split, bt_sortsplit, bt_pfxsaved;
-#endif
-
-/*
- * __BT_SPLIT -- Split the tree.
- *
- * Parameters:
- * t: tree
- * sp: page to split
- * key: key to insert
- * data: data to insert
- * flags: BIGKEY/BIGDATA flags
- * ilen: insert length
- * skip: index to leave open
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- */
-int
-__bt_split(t, sp, key, data, flags, ilen, argskip)
- BTREE *t;
- PAGE *sp;
- const DBT *key, *data;
- int flags;
- size_t ilen;
- u_int32_t argskip;
-{
- BINTERNAL *bi = 0;
- BLEAF *bl = 0, *tbl;
- DBT a, b;
- EPGNO *parent;
- PAGE *h, *l, *r, *lchild, *rchild;
- indx_t nxtindex;
- u_int16_t skip;
- u_int32_t n, nbytes, nksize = 0;
- int parentsplit;
- char *dest;
-
- /*
- * Split the page into two pages, l and r. The split routines return
- * a pointer to the page into which the key should be inserted and with
- * skip set to the offset which should be used. Additionally, l and r
- * are pinned.
- */
- skip = argskip;
- h = sp->pgno == P_ROOT ?
- bt_root(t, sp, &l, &r, &skip, ilen) :
- bt_page(t, sp, &l, &r, &skip, ilen);
- if (h == NULL)
- return (RET_ERROR);
-
- /*
- * Insert the new key/data pair into the leaf page. (Key inserts
- * always cause a leaf page to split first.)
- */
- h->linp[skip] = h->upper -= ilen;
- dest = (char *)h + h->upper;
- if (F_ISSET(t, R_RECNO))
- WR_RLEAF(dest, data, flags)
- else
- WR_BLEAF(dest, key, data, flags)
-
- /* If the root page was split, make it look right. */
- if (sp->pgno == P_ROOT &&
- (F_ISSET(t, R_RECNO) ?
- bt_rroot(t, sp, l, r) : bt_broot(t, sp, l, r)) == RET_ERROR)
- goto err2;
-
- /*
- * Now we walk the parent page stack -- a LIFO stack of the pages that
- * were traversed when we searched for the page that split. Each stack
- * entry is a page number and a page index offset. The offset is for
- * the page traversed on the search. We've just split a page, so we
- * have to insert a new key into the parent page.
- *
- * If the insert into the parent page causes it to split, may have to
- * continue splitting all the way up the tree. We stop if the root
- * splits or the page inserted into didn't have to split to hold the
- * new key. Some algorithms replace the key for the old page as well
- * as the new page. We don't, as there's no reason to believe that the
- * first key on the old page is any better than the key we have, and,
- * in the case of a key being placed at index 0 causing the split, the
- * key is unavailable.
- *
- * There are a maximum of 5 pages pinned at any time. We keep the left
- * and right pages pinned while working on the parent. The 5 are the
- * two children, left parent and right parent (when the parent splits)
- * and the root page or the overflow key page when calling bt_preserve.
- * This code must make sure that all pins are released other than the
- * root page or overflow page which is unlocked elsewhere.
- */
- while ((parent = BT_POP(t)) != NULL) {
- lchild = l;
- rchild = r;
-
- /* Get the parent page. */
- if ((h = mpool_get(t->bt_mp, parent->pgno, 0)) == NULL)
- goto err2;
-
- /*
- * The new key goes ONE AFTER the index, because the split
- * was to the right.
- */
- skip = parent->index + 1;
-
- /*
- * Calculate the space needed on the parent page.
- *
- * Prefix trees: space hack when inserting into BINTERNAL
- * pages. Retain only what's needed to distinguish between
- * the new entry and the LAST entry on the page to its left.
- * If the keys compare equal, retain the entire key. Note,
- * we don't touch overflow keys, and the entire key must be
- * retained for the next-to-left most key on the leftmost
- * page of each level, or the search will fail. Applicable
- * ONLY to internal pages that have leaf pages as children.
- * Further reduction of the key between pairs of internal
- * pages loses too much information.
- */
- switch (rchild->flags & P_TYPE) {
- case P_BINTERNAL:
- bi = GETBINTERNAL(rchild, 0);
- nbytes = NBINTERNAL(bi->ksize);
- break;
- case P_BLEAF:
- bl = GETBLEAF(rchild, 0);
- nbytes = NBINTERNAL(bl->ksize);
- if (t->bt_pfx && !(bl->flags & P_BIGKEY) &&
- (h->prevpg != P_INVALID || skip > 1)) {
- tbl = GETBLEAF(lchild, NEXTINDEX(lchild) - 1);
- a.size = tbl->ksize;
- a.data = tbl->bytes;
- b.size = bl->ksize;
- b.data = bl->bytes;
- nksize = t->bt_pfx(&a, &b);
- n = NBINTERNAL(nksize);
- if (n < nbytes) {
-#ifdef STATISTICS
- bt_pfxsaved += nbytes - n;
-#endif
- nbytes = n;
- } else
- nksize = 0;
- } else
- nksize = 0;
- break;
- case P_RINTERNAL:
- case P_RLEAF:
- nbytes = NRINTERNAL;
- break;
- default:
- abort();
- }
-
- /* Split the parent page if necessary or shift the indices. */
- if ((u_int32_t) (h->upper - h->lower)
- < nbytes + sizeof(indx_t)) {
- sp = h;
- h = h->pgno == P_ROOT ?
- bt_root(t, h, &l, &r, &skip, nbytes) :
- bt_page(t, h, &l, &r, &skip, nbytes);
- if (h == NULL)
- goto err1;
- parentsplit = 1;
- } else {
- if (skip < (nxtindex = NEXTINDEX(h)))
- memmove(h->linp + skip + 1, h->linp + skip,
- (nxtindex - skip) * sizeof(indx_t));
- h->lower += sizeof(indx_t);
- parentsplit = 0;
- }
-
- /* Insert the key into the parent page. */
- switch (rchild->flags & P_TYPE) {
- case P_BINTERNAL:
- h->linp[skip] = h->upper -= nbytes;
- dest = (char *)h + h->linp[skip];
- memmove(dest, bi, nbytes);
- ((BINTERNAL *)dest)->pgno = rchild->pgno;
- break;
- case P_BLEAF:
- h->linp[skip] = h->upper -= nbytes;
- dest = (char *)h + h->linp[skip];
- WR_BINTERNAL(dest, nksize ? nksize : bl->ksize,
- rchild->pgno, bl->flags & P_BIGKEY);
- memmove(dest, bl->bytes, nksize ? nksize : bl->ksize);
- if (bl->flags & P_BIGKEY &&
- bt_preserve(t, *(pgno_t *)bl->bytes) == RET_ERROR)
- goto err1;
- break;
- case P_RINTERNAL:
- /*
- * Update the left page count. If split
- * added at index 0, fix the correct page.
- */
- if (skip > 0)
- dest = (char *)h + h->linp[skip - 1];
- else
- dest = (char *)l + l->linp[NEXTINDEX(l) - 1];
- ((RINTERNAL *)dest)->nrecs = rec_total(lchild);
- ((RINTERNAL *)dest)->pgno = lchild->pgno;
-
- /* Update the right page count. */
- h->linp[skip] = h->upper -= nbytes;
- dest = (char *)h + h->linp[skip];
- ((RINTERNAL *)dest)->nrecs = rec_total(rchild);
- ((RINTERNAL *)dest)->pgno = rchild->pgno;
- break;
- case P_RLEAF:
- /*
- * Update the left page count. If split
- * added at index 0, fix the correct page.
- */
- if (skip > 0)
- dest = (char *)h + h->linp[skip - 1];
- else
- dest = (char *)l + l->linp[NEXTINDEX(l) - 1];
- ((RINTERNAL *)dest)->nrecs = NEXTINDEX(lchild);
- ((RINTERNAL *)dest)->pgno = lchild->pgno;
-
- /* Update the right page count. */
- h->linp[skip] = h->upper -= nbytes;
- dest = (char *)h + h->linp[skip];
- ((RINTERNAL *)dest)->nrecs = NEXTINDEX(rchild);
- ((RINTERNAL *)dest)->pgno = rchild->pgno;
- break;
- default:
- abort();
- }
-
- /* Unpin the held pages. */
- if (!parentsplit) {
- mpool_put(t->bt_mp, h, MPOOL_DIRTY);
- break;
- }
-
- /* If the root page was split, make it look right. */
- if (sp->pgno == P_ROOT &&
- (F_ISSET(t, R_RECNO) ?
- bt_rroot(t, sp, l, r) : bt_broot(t, sp, l, r)) == RET_ERROR)
- goto err1;
-
- mpool_put(t->bt_mp, lchild, MPOOL_DIRTY);
- mpool_put(t->bt_mp, rchild, MPOOL_DIRTY);
- }
-
- /* Unpin the held pages. */
- mpool_put(t->bt_mp, l, MPOOL_DIRTY);
- mpool_put(t->bt_mp, r, MPOOL_DIRTY);
-
- /* Clear any pages left on the stack. */
- return (RET_SUCCESS);
-
- /*
- * If something fails in the above loop we were already walking back
- * up the tree and the tree is now inconsistent. Nothing much we can
- * do about it but release any memory we're holding.
- */
-err1: mpool_put(t->bt_mp, lchild, MPOOL_DIRTY);
- mpool_put(t->bt_mp, rchild, MPOOL_DIRTY);
-
-err2: mpool_put(t->bt_mp, l, 0);
- mpool_put(t->bt_mp, r, 0);
- __dbpanic(t->bt_dbp);
- return (RET_ERROR);
-}
-
-/*
- * BT_PAGE -- Split a non-root page of a btree.
- *
- * Parameters:
- * t: tree
- * h: root page
- * lp: pointer to left page pointer
- * rp: pointer to right page pointer
- * skip: pointer to index to leave open
- * ilen: insert length
- *
- * Returns:
- * Pointer to page in which to insert or NULL on error.
- */
-static PAGE *
-bt_page(t, h, lp, rp, skip, ilen)
- BTREE *t;
- PAGE *h, **lp, **rp;
- indx_t *skip;
- size_t ilen;
-{
- PAGE *l, *r, *tp;
- pgno_t npg;
-
-#ifdef STATISTICS
- ++bt_split;
-#endif
- /* Put the new right page for the split into place. */
- if ((r = __bt_new(t, &npg)) == NULL)
- return (NULL);
- r->pgno = npg;
- r->lower = BTDATAOFF;
- r->upper = t->bt_psize;
- r->nextpg = h->nextpg;
- r->prevpg = h->pgno;
- r->flags = h->flags & P_TYPE;
-
- /*
- * If we're splitting the last page on a level because we're appending
- * a key to it (skip is NEXTINDEX()), it's likely that the data is
- * sorted. Adding an empty page on the side of the level is less work
- * and can push the fill factor much higher than normal. If we're
- * wrong it's no big deal, we'll just do the split the right way next
- * time. It may look like it's equally easy to do a similar hack for
- * reverse sorted data, that is, split the tree left, but it's not.
- * Don't even try.
- */
- if (h->nextpg == P_INVALID && *skip == NEXTINDEX(h)) {
-#ifdef STATISTICS
- ++bt_sortsplit;
-#endif
- h->nextpg = r->pgno;
- r->lower = BTDATAOFF + sizeof(indx_t);
- *skip = 0;
- *lp = h;
- *rp = r;
- return (r);
- }
-
- /* Put the new left page for the split into place. */
- if ((l = (PAGE *)malloc(t->bt_psize)) == NULL) {
- mpool_put(t->bt_mp, r, 0);
- return (NULL);
- }
-#ifdef PURIFY
- memset(l, 0xff, t->bt_psize);
-#endif
- l->pgno = h->pgno;
- l->nextpg = r->pgno;
- l->prevpg = h->prevpg;
- l->lower = BTDATAOFF;
- l->upper = t->bt_psize;
- l->flags = h->flags & P_TYPE;
-
- /* Fix up the previous pointer of the page after the split page. */
- if (h->nextpg != P_INVALID) {
- if ((tp = mpool_get(t->bt_mp, h->nextpg, 0)) == NULL) {
- free(l);
- /* XXX mpool_free(t->bt_mp, r->pgno); */
- return (NULL);
- }
- tp->prevpg = r->pgno;
- mpool_put(t->bt_mp, tp, MPOOL_DIRTY);
- }
-
- /*
- * Split right. The key/data pairs aren't sorted in the btree page so
- * it's simpler to copy the data from the split page onto two new pages
- * instead of copying half the data to the right page and compacting
- * the left page in place. Since the left page can't change, we have
- * to swap the original and the allocated left page after the split.
- */
- tp = bt_psplit(t, h, l, r, skip, ilen);
-
- /* Move the new left page onto the old left page. */
- memmove(h, l, t->bt_psize);
- if (tp == l)
- tp = h;
- free(l);
-
- *lp = h;
- *rp = r;
- return (tp);
-}
-
-/*
- * BT_ROOT -- Split the root page of a btree.
- *
- * Parameters:
- * t: tree
- * h: root page
- * lp: pointer to left page pointer
- * rp: pointer to right page pointer
- * skip: pointer to index to leave open
- * ilen: insert length
- *
- * Returns:
- * Pointer to page in which to insert or NULL on error.
- */
-static PAGE *
-bt_root(t, h, lp, rp, skip, ilen)
- BTREE *t;
- PAGE *h, **lp, **rp;
- indx_t *skip;
- size_t ilen;
-{
- PAGE *l, *r, *tp;
- pgno_t lnpg, rnpg;
-
-#ifdef STATISTICS
- ++bt_split;
- ++bt_rootsplit;
-#endif
- /* Put the new left and right pages for the split into place. */
- if ((l = __bt_new(t, &lnpg)) == NULL ||
- (r = __bt_new(t, &rnpg)) == NULL)
- return (NULL);
- l->pgno = lnpg;
- r->pgno = rnpg;
- l->nextpg = r->pgno;
- r->prevpg = l->pgno;
- l->prevpg = r->nextpg = P_INVALID;
- l->lower = r->lower = BTDATAOFF;
- l->upper = r->upper = t->bt_psize;
- l->flags = r->flags = h->flags & P_TYPE;
-
- /* Split the root page. */
- tp = bt_psplit(t, h, l, r, skip, ilen);
-
- *lp = l;
- *rp = r;
- return (tp);
-}
-
-/*
- * BT_RROOT -- Fix up the recno root page after it has been split.
- *
- * Parameters:
- * t: tree
- * h: root page
- * l: left page
- * r: right page
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- */
-static int
-bt_rroot(t, h, l, r)
- BTREE *t;
- PAGE *h, *l, *r;
-{
- char *dest;
-
- /* Insert the left and right keys, set the header information. */
- h->linp[0] = h->upper = t->bt_psize - NRINTERNAL;
- dest = (char *)h + h->upper;
- WR_RINTERNAL(dest,
- l->flags & P_RLEAF ? NEXTINDEX(l) : rec_total(l), l->pgno);
-
- h->linp[1] = h->upper -= NRINTERNAL;
- dest = (char *)h + h->upper;
- WR_RINTERNAL(dest,
- r->flags & P_RLEAF ? NEXTINDEX(r) : rec_total(r), r->pgno);
-
- h->lower = BTDATAOFF + 2 * sizeof(indx_t);
-
- /* Unpin the root page, set to recno internal page. */
- h->flags &= ~P_TYPE;
- h->flags |= P_RINTERNAL;
- mpool_put(t->bt_mp, h, MPOOL_DIRTY);
-
- return (RET_SUCCESS);
-}
-
-/*
- * BT_BROOT -- Fix up the btree root page after it has been split.
- *
- * Parameters:
- * t: tree
- * h: root page
- * l: left page
- * r: right page
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- */
-static int
-bt_broot(t, h, l, r)
- BTREE *t;
- PAGE *h, *l, *r;
-{
- BINTERNAL *bi;
- BLEAF *bl;
- u_int32_t nbytes;
- char *dest;
-
- /*
- * If the root page was a leaf page, change it into an internal page.
- * We copy the key we split on (but not the key's data, in the case of
- * a leaf page) to the new root page.
- *
- * The btree comparison code guarantees that the left-most key on any
- * level of the tree is never used, so it doesn't need to be filled in.
- */
- nbytes = NBINTERNAL(0);
- h->linp[0] = h->upper = t->bt_psize - nbytes;
- dest = (char *)h + h->upper;
- WR_BINTERNAL(dest, 0, l->pgno, 0);
-
- switch (h->flags & P_TYPE) {
- case P_BLEAF:
- bl = GETBLEAF(r, 0);
- nbytes = NBINTERNAL(bl->ksize);
- h->linp[1] = h->upper -= nbytes;
- dest = (char *)h + h->upper;
- WR_BINTERNAL(dest, bl->ksize, r->pgno, 0);
- memmove(dest, bl->bytes, bl->ksize);
-
- /*
- * If the key is on an overflow page, mark the overflow chain
- * so it isn't deleted when the leaf copy of the key is deleted.
- */
- if (bl->flags & P_BIGKEY &&
- bt_preserve(t, *(pgno_t *)bl->bytes) == RET_ERROR)
- return (RET_ERROR);
- break;
- case P_BINTERNAL:
- bi = GETBINTERNAL(r, 0);
- nbytes = NBINTERNAL(bi->ksize);
- h->linp[1] = h->upper -= nbytes;
- dest = (char *)h + h->upper;
- memmove(dest, bi, nbytes);
- ((BINTERNAL *)dest)->pgno = r->pgno;
- break;
- default:
- abort();
- }
-
- /* There are two keys on the page. */
- h->lower = BTDATAOFF + 2 * sizeof(indx_t);
-
- /* Unpin the root page, set to btree internal page. */
- h->flags &= ~P_TYPE;
- h->flags |= P_BINTERNAL;
- mpool_put(t->bt_mp, h, MPOOL_DIRTY);
-
- return (RET_SUCCESS);
-}
-
-/*
- * BT_PSPLIT -- Do the real work of splitting the page.
- *
- * Parameters:
- * t: tree
- * h: page to be split
- * l: page to put lower half of data
- * r: page to put upper half of data
- * pskip: pointer to index to leave open
- * ilen: insert length
- *
- * Returns:
- * Pointer to page in which to insert.
- */
-static PAGE *
-bt_psplit(t, h, l, r, pskip, ilen)
- BTREE *t;
- PAGE *h, *l, *r;
- indx_t *pskip;
- size_t ilen;
-{
- BINTERNAL *bi;
- BLEAF *bl;
- CURSOR *c;
- RLEAF *rl;
- PAGE *rval;
- void *src = 0;
- indx_t full, half, nxt, off, skip, top, used;
- u_int32_t nbytes;
- int bigkeycnt, isbigkey;
-
- /*
- * Split the data to the left and right pages. Leave the skip index
- * open. Additionally, make some effort not to split on an overflow
- * key. This makes internal page processing faster and can save
- * space as overflow keys used by internal pages are never deleted.
- */
- bigkeycnt = 0;
- skip = *pskip;
- full = t->bt_psize - BTDATAOFF;
- half = full / 2;
- used = 0;
- for (nxt = off = 0, top = NEXTINDEX(h); nxt < top; ++off) {
- if (skip == off) {
- nbytes = ilen;
- isbigkey = 0; /* XXX: not really known. */
- } else
- switch (h->flags & P_TYPE) {
- case P_BINTERNAL:
- src = bi = GETBINTERNAL(h, nxt);
- nbytes = NBINTERNAL(bi->ksize);
- isbigkey = bi->flags & P_BIGKEY;
- break;
- case P_BLEAF:
- src = bl = GETBLEAF(h, nxt);
- nbytes = NBLEAF(bl);
- isbigkey = bl->flags & P_BIGKEY;
- break;
- case P_RINTERNAL:
- src = GETRINTERNAL(h, nxt);
- nbytes = NRINTERNAL;
- isbigkey = 0;
- break;
- case P_RLEAF:
- src = rl = GETRLEAF(h, nxt);
- nbytes = NRLEAF(rl);
- isbigkey = 0;
- break;
- default:
- abort();
- }
-
- /*
- * If the key/data pairs are substantial fractions of the max
- * possible size for the page, it's possible to get situations
- * where we decide to try and copy too much onto the left page.
- * Make sure that doesn't happen.
- */
- if ((skip <= off && used + nbytes + sizeof(indx_t) >= full)
- || nxt == top - 1) {
- --off;
- break;
- }
-
- /* Copy the key/data pair, if not the skipped index. */
- if (skip != off) {
- ++nxt;
-
- l->linp[off] = l->upper -= nbytes;
- memmove((char *)l + l->upper, src, nbytes);
- }
-
- used += nbytes + sizeof(indx_t);
- if (used >= half) {
- if (!isbigkey || bigkeycnt == 3)
- break;
- else
- ++bigkeycnt;
- }
- }
-
- /*
- * Off is the last offset that's valid for the left page.
- * Nxt is the first offset to be placed on the right page.
- */
- l->lower += (off + 1) * sizeof(indx_t);
-
- /*
- * If splitting the page that the cursor was on, the cursor has to be
- * adjusted to point to the same record as before the split. If the
- * cursor is at or past the skipped slot, the cursor is incremented by
- * one. If the cursor is on the right page, it is decremented by the
- * number of records split to the left page.
- */
- c = &t->bt_cursor;
- if (F_ISSET(c, CURS_INIT) && c->pg.pgno == h->pgno) {
- if (c->pg.index >= skip)
- ++c->pg.index;
- if (c->pg.index < nxt) /* Left page. */
- c->pg.pgno = l->pgno;
- else { /* Right page. */
- c->pg.pgno = r->pgno;
- c->pg.index -= nxt;
- }
- }
-
- /*
- * If the skipped index was on the left page, just return that page.
- * Otherwise, adjust the skip index to reflect the new position on
- * the right page.
- */
- if (skip <= off) {
- skip = 0;
- rval = l;
- } else {
- rval = r;
- *pskip -= nxt;
- }
-
- for (off = 0; nxt < top; ++off) {
- if (skip == nxt) {
- ++off;
- skip = 0;
- }
- switch (h->flags & P_TYPE) {
- case P_BINTERNAL:
- src = bi = GETBINTERNAL(h, nxt);
- nbytes = NBINTERNAL(bi->ksize);
- break;
- case P_BLEAF:
- src = bl = GETBLEAF(h, nxt);
- nbytes = NBLEAF(bl);
- break;
- case P_RINTERNAL:
- src = GETRINTERNAL(h, nxt);
- nbytes = NRINTERNAL;
- break;
- case P_RLEAF:
- src = rl = GETRLEAF(h, nxt);
- nbytes = NRLEAF(rl);
- break;
- default:
- abort();
- }
- ++nxt;
- r->linp[off] = r->upper -= nbytes;
- memmove((char *)r + r->upper, src, nbytes);
- }
- r->lower += off * sizeof(indx_t);
-
- /* If the key is being appended to the page, adjust the index. */
- if (skip == top)
- r->lower += sizeof(indx_t);
-
- return (rval);
-}
-
-/*
- * BT_PRESERVE -- Mark a chain of pages as used by an internal node.
- *
- * Chains of indirect blocks pointed to by leaf nodes get reclaimed when the
- * record that references them gets deleted. Chains pointed to by internal
- * pages never get deleted. This routine marks a chain as pointed to by an
- * internal page.
- *
- * Parameters:
- * t: tree
- * pg: page number of first page in the chain.
- *
- * Returns:
- * RET_SUCCESS, RET_ERROR.
- */
-static int
-bt_preserve(t, pg)
- BTREE *t;
- pgno_t pg;
-{
- PAGE *h;
-
- if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
- return (RET_ERROR);
- h->flags |= P_PRESERVE;
- mpool_put(t->bt_mp, h, MPOOL_DIRTY);
- return (RET_SUCCESS);
-}
-
-/*
- * REC_TOTAL -- Return the number of recno entries below a page.
- *
- * Parameters:
- * h: page
- *
- * Returns:
- * The number of recno entries below a page.
- *
- * XXX
- * These values could be set by the bt_psplit routine. The problem is that the
- * entry has to be popped off of the stack etc. or the values have to be passed
- * all the way back to bt_split/bt_rroot and it's not very clean.
- */
-static recno_t
-rec_total(h)
- PAGE *h;
-{
- recno_t recs;
- indx_t nxt, top;
-
- for (recs = 0, nxt = 0, top = NEXTINDEX(h); nxt < top; ++nxt)
- recs += GETRINTERNAL(h, nxt)->nrecs;
- return (recs);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Mike Olson.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)bt_utils.c 8.8 (Berkeley) 7/20/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/param.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "../include/db.h"
-#include "btree.h"
-
-/*
- * __bt_ret --
- * Build return key/data pair.
- *
- * Parameters:
- * t: tree
- * e: key/data pair to be returned
- * key: user's key structure (NULL if not to be filled in)
- * rkey: memory area to hold key
- * data: user's data structure (NULL if not to be filled in)
- * rdata: memory area to hold data
- * copy: always copy the key/data item
- *
- * Returns:
- * RET_SUCCESS, RET_ERROR.
- */
-int
-__bt_ret(t, e, key, rkey, data, rdata, copy)
- BTREE *t;
- EPG *e;
- DBT *key, *rkey, *data, *rdata;
- int copy;
-{
- BLEAF *bl;
- void *p;
-
- bl = GETBLEAF(e->page, e->index);
-
- /*
- * We must copy big keys/data to make them contiguous. Otherwise,
- * leave the page pinned and don't copy unless the user specified
- * concurrent access.
- */
- if (key == NULL)
- goto dataonly;
-
- if (bl->flags & P_BIGKEY) {
- if (__ovfl_get(t, bl->bytes,
- &key->size, &rkey->data, &rkey->size))
- return (RET_ERROR);
- key->data = rkey->data;
- } else if (copy || F_ISSET(t, B_DB_LOCK)) {
- if (bl->ksize > rkey->size) {
- p = (void *)(rkey->data == NULL ?
- malloc(bl->ksize) : realloc(rkey->data, bl->ksize));
- if (p == NULL)
- return (RET_ERROR);
- rkey->data = p;
- rkey->size = bl->ksize;
- }
- memmove(rkey->data, bl->bytes, bl->ksize);
- key->size = bl->ksize;
- key->data = rkey->data;
- } else {
- key->size = bl->ksize;
- key->data = bl->bytes;
- }
-
-dataonly:
- if (data == NULL)
- return (RET_SUCCESS);
-
- if (bl->flags & P_BIGDATA) {
- if (__ovfl_get(t, bl->bytes + bl->ksize,
- &data->size, &rdata->data, &rdata->size))
- return (RET_ERROR);
- data->data = rdata->data;
- } else if (copy || F_ISSET(t, B_DB_LOCK)) {
- /* Use +1 in case the first record retrieved is 0 length. */
- if (bl->dsize + 1 > rdata->size) {
- p = (void *)(rdata->data == NULL ?
- malloc(bl->dsize + 1) :
- realloc(rdata->data, bl->dsize + 1));
- if (p == NULL)
- return (RET_ERROR);
- rdata->data = p;
- rdata->size = bl->dsize + 1;
- }
- memmove(rdata->data, bl->bytes + bl->ksize, bl->dsize);
- data->size = bl->dsize;
- data->data = rdata->data;
- } else {
- data->size = bl->dsize;
- data->data = bl->bytes + bl->ksize;
- }
-
- return (RET_SUCCESS);
-}
-
-/*
- * __BT_CMP -- Compare a key to a given record.
- *
- * Parameters:
- * t: tree
- * k1: DBT pointer of first arg to comparison
- * e: pointer to EPG for comparison
- *
- * Returns:
- * < 0 if k1 is < record
- * = 0 if k1 is = record
- * > 0 if k1 is > record
- */
-int
-__bt_cmp(t, k1, e)
- BTREE *t;
- const DBT *k1;
- EPG *e;
-{
- BINTERNAL *bi;
- BLEAF *bl;
- DBT k2;
- PAGE *h;
- void *bigkey;
-
- /*
- * The left-most key on internal pages, at any level of the tree, is
- * guaranteed by the following code to be less than any user key.
- * This saves us from having to update the leftmost key on an internal
- * page when the user inserts a new key in the tree smaller than
- * anything we've yet seen.
- */
- h = e->page;
- if (e->index == 0 && h->prevpg == P_INVALID && !(h->flags & P_BLEAF))
- return (1);
-
- bigkey = NULL;
- if (h->flags & P_BLEAF) {
- bl = GETBLEAF(h, e->index);
- if (bl->flags & P_BIGKEY)
- bigkey = bl->bytes;
- else {
- k2.data = bl->bytes;
- k2.size = bl->ksize;
- }
- } else {
- bi = GETBINTERNAL(h, e->index);
- if (bi->flags & P_BIGKEY)
- bigkey = bi->bytes;
- else {
- k2.data = bi->bytes;
- k2.size = bi->ksize;
- }
- }
-
- if (bigkey) {
- if (__ovfl_get(t, bigkey,
- &k2.size, &t->bt_rdata.data, &t->bt_rdata.size))
- return (RET_ERROR);
- k2.data = t->bt_rdata.data;
- }
- return ((*t->bt_cmp)(k1, &k2));
-}
-
-/*
- * __BT_DEFCMP -- Default comparison routine.
- *
- * Parameters:
- * a: DBT #1
- * b: DBT #2
- *
- * Returns:
- * < 0 if a is < b
- * = 0 if a is = b
- * > 0 if a is > b
- */
-int
-__bt_defcmp(a, b)
- const DBT *a, *b;
-{
- register size_t len;
- register u_char *p1, *p2;
-
- /*
- * XXX
- * If a size_t doesn't fit in an int, this routine can lose.
- * What we need is a integral type which is guaranteed to be
- * larger than a size_t, and there is no such thing.
- */
- len = MIN(a->size, b->size);
- for (p1 = a->data, p2 = b->data; len--; ++p1, ++p2)
- if (*p1 != *p2)
- return ((int)*p1 - (int)*p2);
- return ((int)a->size - (int)b->size);
-}
-
-/*
- * __BT_DEFPFX -- Default prefix routine.
- *
- * Parameters:
- * a: DBT #1
- * b: DBT #2
- *
- * Returns:
- * Number of bytes needed to distinguish b from a.
- */
-size_t
-__bt_defpfx(a, b)
- const DBT *a, *b;
-{
- register u_char *p1, *p2;
- register size_t cnt, len;
-
- cnt = 1;
- len = MIN(a->size, b->size);
- for (p1 = a->data, p2 = b->data; len--; ++p1, ++p2, ++cnt)
- if (*p1 != *p2)
- return (cnt);
-
- /* a->size must be <= b->size, or they wouldn't be in this order. */
- return (a->size < b->size ? a->size + 1 : a->size);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1991, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Mike Olson.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)btree.h 8.11 (Berkeley) 8/17/94
- */
-
-/* Macros to set/clear/test flags. */
-#define F_SET(p, f) (p)->flags |= (f)
-#define F_CLR(p, f) (p)->flags &= ~(f)
-#define F_ISSET(p, f) ((p)->flags & (f))
-
-#include <mpool.h>
-
-#define mpool_open __mpool_open
-#define mpool_filter __mpool_filter
-#define mpool_new __mpool_new
-#define mpool_get __mpool_get
-#define mpool_put __mpool_put
-#define mpool_sync __mpool_sync
-#define mpool_close __mpool_close
-
-#define DEFMINKEYPAGE (2) /* Minimum keys per page */
-#define MINCACHE (5) /* Minimum cached pages */
-#define MINPSIZE (512) /* Minimum page size */
-
-/*
- * Page 0 of a btree file contains a copy of the meta-data. This page is also
- * used as an out-of-band page, i.e. page pointers that point to nowhere point
- * to page 0. Page 1 is the root of the btree.
- */
-#define P_INVALID 0 /* Invalid tree page number. */
-#define P_META 0 /* Tree metadata page number. */
-#define P_ROOT 1 /* Tree root page number. */
-
-/*
- * There are five page layouts in the btree: btree internal pages (BINTERNAL),
- * btree leaf pages (BLEAF), recno internal pages (RINTERNAL), recno leaf pages
- * (RLEAF) and overflow pages. All five page types have a page header (PAGE).
- * This implementation requires that values within structures NOT be padded.
- * (ANSI C permits random padding.) If your compiler pads randomly you'll have
- * to do some work to get this package to run.
- */
-typedef struct _page {
- pgno_t pgno; /* this page's page number */
- pgno_t prevpg; /* left sibling */
- pgno_t nextpg; /* right sibling */
-
-#define P_BINTERNAL 0x01 /* btree internal page */
-#define P_BLEAF 0x02 /* leaf page */
-#define P_OVERFLOW 0x04 /* overflow page */
-#define P_RINTERNAL 0x08 /* recno internal page */
-#define P_RLEAF 0x10 /* leaf page */
-#define P_TYPE 0x1f /* type mask */
-#define P_PRESERVE 0x20 /* never delete this chain of pages */
- u_int32_t flags;
-
- indx_t lower; /* lower bound of free space on page */
- indx_t upper; /* upper bound of free space on page */
- indx_t linp[1]; /* indx_t-aligned VAR. LENGTH DATA */
-} PAGE;
-
-/* First and next index. */
-#define BTDATAOFF \
- (sizeof(pgno_t) + sizeof(pgno_t) + sizeof(pgno_t) + \
- sizeof(u_int32_t) + sizeof(indx_t) + sizeof(indx_t))
-#define NEXTINDEX(p) (((p)->lower - BTDATAOFF) / sizeof(indx_t))
-
-/*
- * For pages other than overflow pages, there is an array of offsets into the
- * rest of the page immediately following the page header. Each offset is to
- * an item which is unique to the type of page. The h_lower offset is just
- * past the last filled-in index. The h_upper offset is the first item on the
- * page. Offsets are from the beginning of the page.
- *
- * If an item is too big to store on a single page, a flag is set and the item
- * is a { page, size } pair such that the page is the first page of an overflow
- * chain with size bytes of item. Overflow pages are simply bytes without any
- * external structure.
- *
- * The page number and size fields in the items are pgno_t-aligned so they can
- * be manipulated without copying. (This presumes that 32 bit items can be
- * manipulated on this system.)
- */
-#define LALIGN(n) (((n) + sizeof(pgno_t) - 1) & ~(sizeof(pgno_t) - 1))
-#define NOVFLSIZE (sizeof(pgno_t) + sizeof(u_int32_t))
-
-/*
- * For the btree internal pages, the item is a key. BINTERNALs are {key, pgno}
- * pairs, such that the key compares less than or equal to all of the records
- * on that page. For a tree without duplicate keys, an internal page with two
- * consecutive keys, a and b, will have all records greater than or equal to a
- * and less than b stored on the page associated with a. Duplicate keys are
- * somewhat special and can cause duplicate internal and leaf page records and
- * some minor modifications of the above rule.
- */
-typedef struct _binternal {
- u_int32_t ksize; /* key size */
- pgno_t pgno; /* page number stored on */
-#define P_BIGDATA 0x01 /* overflow data */
-#define P_BIGKEY 0x02 /* overflow key */
- u_char flags;
- char bytes[1]; /* data */
-} BINTERNAL;
-
-/* Get the page's BINTERNAL structure at index indx. */
-#define GETBINTERNAL(pg, indx) \
- ((BINTERNAL *)((char *)(pg) + (pg)->linp[indx]))
-
-/* Get the number of bytes in the entry. */
-#define NBINTERNAL(len) \
- LALIGN(sizeof(u_int32_t) + sizeof(pgno_t) + sizeof(u_char) + (len))
-
-/* Copy a BINTERNAL entry to the page. */
-#define WR_BINTERNAL(p, size, pgno, flags) { \
- *(u_int32_t *)p = size; \
- p += sizeof(u_int32_t); \
- *(pgno_t *)p = pgno; \
- p += sizeof(pgno_t); \
- *(u_char *)p = flags; \
- p += sizeof(u_char); \
-}
-
-/*
- * For the recno internal pages, the item is a page number with the number of
- * keys found on that page and below.
- */
-typedef struct _rinternal {
- recno_t nrecs; /* number of records */
- pgno_t pgno; /* page number stored below */
-} RINTERNAL;
-
-/* Get the page's RINTERNAL structure at index indx. */
-#define GETRINTERNAL(pg, indx) \
- ((RINTERNAL *)((char *)(pg) + (pg)->linp[indx]))
-
-/* Get the number of bytes in the entry. */
-#define NRINTERNAL \
- LALIGN(sizeof(recno_t) + sizeof(pgno_t))
-
-/* Copy a RINTERNAL entry to the page. */
-#define WR_RINTERNAL(p, nrecs, pgno) { \
- *(recno_t *)p = nrecs; \
- p += sizeof(recno_t); \
- *(pgno_t *)p = pgno; \
-}
-
-/* For the btree leaf pages, the item is a key and data pair. */
-typedef struct _bleaf {
- u_int32_t ksize; /* size of key */
- u_int32_t dsize; /* size of data */
- u_char flags; /* P_BIGDATA, P_BIGKEY */
- char bytes[1]; /* data */
-} BLEAF;
-
-/* Get the page's BLEAF structure at index indx. */
-#define GETBLEAF(pg, indx) \
- ((BLEAF *)((char *)(pg) + (pg)->linp[indx]))
-
-/* Get the number of bytes in the entry. */
-#define NBLEAF(p) NBLEAFDBT((p)->ksize, (p)->dsize)
-
-/* Get the number of bytes in the user's key/data pair. */
-#define NBLEAFDBT(ksize, dsize) \
- LALIGN(sizeof(u_int32_t) + sizeof(u_int32_t) + sizeof(u_char) + \
- (ksize) + (dsize))
-
-/* Copy a BLEAF entry to the page. */
-#define WR_BLEAF(p, key, data, flags) { \
- *(u_int32_t *)p = key->size; \
- p += sizeof(u_int32_t); \
- *(u_int32_t *)p = data->size; \
- p += sizeof(u_int32_t); \
- *(u_char *)p = flags; \
- p += sizeof(u_char); \
- memmove(p, key->data, key->size); \
- p += key->size; \
- memmove(p, data->data, data->size); \
-}
-
-/* For the recno leaf pages, the item is a data entry. */
-typedef struct _rleaf {
- u_int32_t dsize; /* size of data */
- u_char flags; /* P_BIGDATA */
- char bytes[1];
-} RLEAF;
-
-/* Get the page's RLEAF structure at index indx. */
-#define GETRLEAF(pg, indx) \
- ((RLEAF *)((char *)(pg) + (pg)->linp[indx]))
-
-/* Get the number of bytes in the entry. */
-#define NRLEAF(p) NRLEAFDBT((p)->dsize)
-
-/* Get the number of bytes from the user's data. */
-#define NRLEAFDBT(dsize) \
- LALIGN(sizeof(u_int32_t) + sizeof(u_char) + (dsize))
-
-/* Copy a RLEAF entry to the page. */
-#define WR_RLEAF(p, data, flags) { \
- *(u_int32_t *)p = data->size; \
- p += sizeof(u_int32_t); \
- *(u_char *)p = flags; \
- p += sizeof(u_char); \
- memmove(p, data->data, data->size); \
-}
-
-/*
- * A record in the tree is either a pointer to a page and an index in the page
- * or a page number and an index. These structures are used as a cursor, stack
- * entry and search returns as well as to pass records to other routines.
- *
- * One comment about searches. Internal page searches must find the largest
- * record less than key in the tree so that descents work. Leaf page searches
- * must find the smallest record greater than key so that the returned index
- * is the record's correct position for insertion.
- */
-typedef struct _epgno {
- pgno_t pgno; /* the page number */
- indx_t index; /* the index on the page */
-} EPGNO;
-
-typedef struct _epg {
- PAGE *page; /* the (pinned) page */
- indx_t index; /* the index on the page */
-} EPG;
-
-/*
- * About cursors. The cursor (and the page that contained the key/data pair
- * that it referenced) can be deleted, which makes things a bit tricky. If
- * there are no duplicates of the cursor key in the tree (i.e. B_NODUPS is set
- * or there simply aren't any duplicates of the key) we copy the key that it
- * referenced when it's deleted, and reacquire a new cursor key if the cursor
- * is used again. If there are duplicates keys, we move to the next/previous
- * key, and set a flag so that we know what happened. NOTE: if duplicate (to
- * the cursor) keys are added to the tree during this process, it is undefined
- * if they will be returned or not in a cursor scan.
- *
- * The flags determine the possible states of the cursor:
- *
- * CURS_INIT The cursor references *something*.
- * CURS_ACQUIRE The cursor was deleted, and a key has been saved so that
- * we can reacquire the right position in the tree.
- * CURS_AFTER, CURS_BEFORE
- * The cursor was deleted, and now references a key/data pair
- * that has not yet been returned, either before or after the
- * deleted key/data pair.
- * XXX
- * This structure is broken out so that we can eventually offer multiple
- * cursors as part of the DB interface.
- */
-typedef struct _cursor {
- EPGNO pg; /* B: Saved tree reference. */
- DBT key; /* B: Saved key, or key.data == NULL. */
- recno_t rcursor; /* R: recno cursor (1-based) */
-
-#define CURS_ACQUIRE 0x01 /* B: Cursor needs to be reacquired. */
-#define CURS_AFTER 0x02 /* B: Unreturned cursor after key. */
-#define CURS_BEFORE 0x04 /* B: Unreturned cursor before key. */
-#define CURS_INIT 0x08 /* RB: Cursor initialized. */
- u_int8_t flags;
-} CURSOR;
-
-/*
- * The metadata of the tree. The nrecs field is used only by the RECNO code.
- * This is because the btree doesn't really need it and it requires that every
- * put or delete call modify the metadata.
- */
-typedef struct _btmeta {
- u_int32_t magic; /* magic number */
- u_int32_t version; /* version */
- u_int32_t psize; /* page size */
- u_int32_t free; /* page number of first free page */
- u_int32_t nrecs; /* R: number of records */
-
-#define SAVEMETA (B_NODUPS | R_RECNO)
- u_int32_t flags; /* bt_flags & SAVEMETA */
-} BTMETA;
-
-/* The in-memory btree/recno data structure. */
-typedef struct _btree {
- MPOOL *bt_mp; /* memory pool cookie */
-
- DB *bt_dbp; /* pointer to enclosing DB */
-
- EPG bt_cur; /* current (pinned) page */
- PAGE *bt_pinned; /* page pinned across calls */
-
- CURSOR bt_cursor; /* cursor */
-
-#define BT_PUSH(t, p, i) { \
- t->bt_sp->pgno = p; \
- t->bt_sp->index = i; \
- ++t->bt_sp; \
-}
-#define BT_POP(t) (t->bt_sp == t->bt_stack ? NULL : --t->bt_sp)
-#define BT_CLR(t) (t->bt_sp = t->bt_stack)
- EPGNO bt_stack[50]; /* stack of parent pages */
- EPGNO *bt_sp; /* current stack pointer */
-
- DBT bt_rkey; /* returned key */
- DBT bt_rdata; /* returned data */
-
- int bt_fd; /* tree file descriptor */
-
- pgno_t bt_free; /* next free page */
- u_int32_t bt_psize; /* page size */
- indx_t bt_ovflsize; /* cut-off for key/data overflow */
- int bt_lorder; /* byte order */
- /* sorted order */
- enum { NOT, BACK, FORWARD } bt_order;
- EPGNO bt_last; /* last insert */
-
- /* B: key comparison function */
- int (*bt_cmp) __P((const DBT *, const DBT *));
- /* B: prefix comparison function */
- size_t (*bt_pfx) __P((const DBT *, const DBT *));
- /* R: recno input function */
- int (*bt_irec) __P((struct _btree *, recno_t));
-
- FILE *bt_rfp; /* R: record FILE pointer */
- int bt_rfd; /* R: record file descriptor */
-
- caddr_t bt_cmap; /* R: current point in mapped space */
- caddr_t bt_smap; /* R: start of mapped space */
- caddr_t bt_emap; /* R: end of mapped space */
- size_t bt_msize; /* R: size of mapped region. */
-
- recno_t bt_nrecs; /* R: number of records */
- size_t bt_reclen; /* R: fixed record length */
- u_char bt_bval; /* R: delimiting byte/pad character */
-
-/*
- * NB:
- * B_NODUPS and R_RECNO are stored on disk, and may not be changed.
- */
-#define B_INMEM 0x00001 /* in-memory tree */
-#define B_METADIRTY 0x00002 /* need to write metadata */
-#define B_MODIFIED 0x00004 /* tree modified */
-#define B_NEEDSWAP 0x00008 /* if byte order requires swapping */
-#define B_RDONLY 0x00010 /* read-only tree */
-
-#define B_NODUPS 0x00020 /* no duplicate keys permitted */
-#define R_RECNO 0x00080 /* record oriented tree */
-
-#define R_CLOSEFP 0x00040 /* opened a file pointer */
-#define R_EOF 0x00100 /* end of input file reached. */
-#define R_FIXLEN 0x00200 /* fixed length records */
-#define R_MEMMAPPED 0x00400 /* memory mapped file. */
-#define R_INMEM 0x00800 /* in-memory file */
-#define R_MODIFIED 0x01000 /* modified file */
-#define R_RDONLY 0x02000 /* read-only file */
-
-#define B_DB_LOCK 0x04000 /* DB_LOCK specified. */
-#define B_DB_SHMEM 0x08000 /* DB_SHMEM specified. */
-#define B_DB_TXN 0x10000 /* DB_TXN specified. */
- u_int32_t flags;
-} BTREE;
-
-#include "extern.h"
+++ /dev/null
-/*-
- * Copyright (c) 1991, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)extern.h 8.10 (Berkeley) 7/20/94
- */
-
-int __bt_close __P((DB *));
-int __bt_cmp __P((BTREE *, const DBT *, EPG *));
-int __bt_crsrdel __P((BTREE *, EPGNO *));
-int __bt_defcmp __P((const DBT *, const DBT *));
-size_t __bt_defpfx __P((const DBT *, const DBT *));
-int __bt_delete __P((const DB *, const DBT *, u_int));
-int __bt_dleaf __P((BTREE *, const DBT *, PAGE *, u_int));
-int __bt_fd __P((const DB *));
-int __bt_free __P((BTREE *, PAGE *));
-int __bt_get __P((const DB *, const DBT *, DBT *, u_int));
-PAGE *__bt_new __P((BTREE *, pgno_t *));
-void __bt_pgin __P((void *, pgno_t, void *));
-void __bt_pgout __P((void *, pgno_t, void *));
-int __bt_push __P((BTREE *, pgno_t, int));
-int __bt_put __P((const DB *dbp, DBT *, const DBT *, u_int));
-int __bt_ret __P((BTREE *, EPG *, DBT *, DBT *, DBT *, DBT *, int));
-EPG *__bt_search __P((BTREE *, const DBT *, int *));
-int __bt_seq __P((const DB *, DBT *, DBT *, u_int));
-void __bt_setcur __P((BTREE *, pgno_t, u_int));
-int __bt_split __P((BTREE *, PAGE *,
- const DBT *, const DBT *, int, size_t, u_int32_t));
-int __bt_sync __P((const DB *, u_int));
-
-int __ovfl_delete __P((BTREE *, void *));
-int __ovfl_get __P((BTREE *, void *, size_t *, void **, size_t *));
-int __ovfl_put __P((BTREE *, const DBT *, pgno_t *));
-
-#ifdef DEBUG
-void __bt_dnpage __P((DB *, pgno_t));
-void __bt_dpage __P((PAGE *));
-void __bt_dump __P((DB *));
-#endif
-#ifdef STATISTICS
-void __bt_stat __P((DB *));
-#endif
+++ /dev/null
-/*-
- * Copyright (c) 1991, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)db.c 8.4 (Berkeley) 2/21/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <errno.h>
-#include <fcntl.h>
-#include <stddef.h>
-#include <stdio.h>
-
-#include "../include/db.h"
-
-DB *
-dbopen(fname, flags, mode, type, openinfo)
- const char *fname;
- int flags, mode;
- DBTYPE type;
- const void *openinfo;
-{
-
-#define DB_FLAGS (DB_LOCK | DB_SHMEM | DB_TXN)
-#define USE_OPEN_FLAGS \
- (O_CREAT | O_EXCL | O_EXLOCK | O_NONBLOCK | O_RDONLY | \
- O_RDWR | O_SHLOCK | O_TRUNC)
-
- if ((flags & ~(USE_OPEN_FLAGS | DB_FLAGS)) == 0)
- switch (type) {
- case DB_BTREE:
- return (__bt_open(fname, flags & USE_OPEN_FLAGS,
- mode, openinfo, flags & DB_FLAGS));
- case DB_HASH:
- return (__hash_open(fname, flags & USE_OPEN_FLAGS,
- mode, openinfo, flags & DB_FLAGS));
- case DB_RECNO:
- return (__rec_open(fname, flags & USE_OPEN_FLAGS,
- mode, openinfo, flags & DB_FLAGS));
- }
- errno = EINVAL;
- return (NULL);
-}
-
-static int
-__dberr __P((void))
-{
- return (RET_ERROR);
-}
-
-/*
- * __DBPANIC -- Stop.
- *
- * Parameters:
- * dbp: pointer to the DB structure.
- */
-void
-__dbpanic(dbp)
- DB *dbp;
-{
- /* The only thing that can succeed is a close. */
- dbp->del = (int (*)__P((const struct __db *,
- const DBT *, u_int))) __dberr;
- dbp->get = (int (*)__P((const struct __db *,
- const DBT *, DBT *, u_int))) __dberr;
- dbp->put = (int (*)__P((const struct __db *,
- DBT *, const DBT *, u_int))) __dberr;
- dbp->seq = (int (*)__P((const struct __db *,
- DBT *, DBT *, u_int))) __dberr;
- dbp->sync = (int (*)__P((const struct __db *, u_int))) __dberr;
- dbp->fd = (int (*)__P((const struct __db *))) __dberr;
-}
+++ /dev/null
-# @(#)README 8.1 (Berkeley) 6/4/93
-
-This package implements a superset of the hsearch and dbm/ndbm libraries.
-
-Test Programs:
- All test programs which need key/data pairs expect them entered
- with key and data on separate lines
-
- tcreat3.c
- Takes
- bucketsize (bsize),
- fill factor (ffactor), and
- initial number of elements (nelem).
- Creates a hash table named hashtest containing the
- keys/data pairs entered from standard in.
- thash4.c
- Takes
- bucketsize (bsize),
- fill factor (ffactor),
- initial number of elements (nelem)
- bytes of cache (ncached), and
- file from which to read data (fname)
- Creates a table from the key/data pairs on standard in and
- then does a read of each key/data in fname
- tdel.c
- Takes
- bucketsize (bsize), and
- fill factor (ffactor).
- file from which to read data (fname)
- Reads each key/data pair from fname and deletes the
- key from the hash table hashtest
- tseq.c
- Reads the key/data pairs in the file hashtest and writes them
- to standard out.
- tread2.c
- Takes
- bytes of cache (ncached).
- Reads key/data pairs from standard in and looks them up
- in the file hashtest.
- tverify.c
- Reads key/data pairs from standard in, looks them up
- in the file hashtest, and verifies that the data is
- correct.
-
-NOTES:
-
-The file search.h is provided for using the hsearch compatible interface
-on BSD systems. On System V derived systems, search.h should appear in
-/usr/include.
-
-The man page ../man/db.3 explains the interface to the hashing system.
-The file hash.ps is a postscript copy of a paper explaining
-the history, implementation, and performance of the hash package.
-
-"bugs" or idiosyncracies
-
-If you have a lot of overflows, it is possible to run out of overflow
-pages. Currently, this will cause a message to be printed on stderr.
-Eventually, this will be indicated by a return error code.
-
-If you are using the ndbm interface and exit without flushing or closing the
-file, you may lose updates since the package buffers all writes. Also,
-the db interface only creates a single database file. To avoid overwriting
-the user's original file, the suffix ".db" is appended to the file name
-passed to dbm_open. Additionally, if your code "knows" about the historic
-.dir and .pag files, it will break.
-
-There is a fundamental difference between this package and the old hsearch.
-Hsearch requires the user to maintain the keys and data in the application's
-allocated memory while hash takes care of all storage management. The down
-side is that the byte strings passed in the ENTRY structure must be null
-terminated (both the keys and the data).
+++ /dev/null
-/*-
- * Copyright (c) 1991, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)extern.h 8.4 (Berkeley) 6/16/94
- */
-
-BUFHEAD *__add_ovflpage __P((HTAB *, BUFHEAD *));
-int __addel __P((HTAB *, BUFHEAD *, const DBT *, const DBT *));
-int __big_delete __P((HTAB *, BUFHEAD *));
-int __big_insert __P((HTAB *, BUFHEAD *, const DBT *, const DBT *));
-int __big_keydata __P((HTAB *, BUFHEAD *, DBT *, DBT *, int));
-int __big_return __P((HTAB *, BUFHEAD *, int, DBT *, int));
-int __big_split __P((HTAB *, BUFHEAD *, BUFHEAD *, BUFHEAD *,
- int, u_int32_t, SPLIT_RETURN *));
-int __buf_free __P((HTAB *, int, int));
-void __buf_init __P((HTAB *, int));
-u_int32_t __call_hash __P((HTAB *, char *, int));
-int __delpair __P((HTAB *, BUFHEAD *, int));
-int __expand_table __P((HTAB *));
-int __find_bigpair __P((HTAB *, BUFHEAD *, int, char *, int));
-u_int16_t __find_last_page __P((HTAB *, BUFHEAD **));
-void __free_ovflpage __P((HTAB *, BUFHEAD *));
-BUFHEAD *__get_buf __P((HTAB *, u_int32_t, BUFHEAD *, int));
-int __get_page __P((HTAB *, char *, u_int32_t, int, int, int));
-int __ibitmap __P((HTAB *, int, int, int));
-u_int32_t __hash_log2 __P((u_int32_t));
-int __put_page __P((HTAB *, char *, u_int32_t, int, int));
-void __reclaim_buf __P((HTAB *, BUFHEAD *));
-int __split_page __P((HTAB *, u_int32_t, u_int32_t));
-
-/* Default hash routine. */
-extern u_int32_t (*__default_hash) __P((const void *, size_t));
-
-#ifdef HASH_STATISTICS
-extern int hash_accesses, hash_collisions, hash_expansions, hash_overflows;
-#endif
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Margo Seltzer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)hash.c 8.9 (Berkeley) 6/16/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/param.h>
-#include <sys/stat.h>
-
-#include <errno.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#ifdef DEBUG
-#include <assert.h>
-#endif
-
-#include "../include/db.h"
-#include "hash.h"
-#include "page.h"
-#include "extern.h"
-
-static int alloc_segs __P((HTAB *, int));
-static int flush_meta __P((HTAB *));
-static int hash_access __P((HTAB *, ACTION, DBT *, DBT *));
-static int hash_close __P((DB *));
-static int hash_delete __P((const DB *, const DBT *, u_int32_t));
-static int hash_fd __P((const DB *));
-static int hash_get __P((const DB *, const DBT *, DBT *, u_int32_t));
-static int hash_put __P((const DB *, DBT *, const DBT *, u_int32_t));
-static void *hash_realloc __P((SEGMENT **, int, int));
-static int hash_seq __P((const DB *, DBT *, DBT *, u_int32_t));
-static int hash_sync __P((const DB *, u_int32_t));
-static int hdestroy __P((HTAB *));
-static HTAB *init_hash __P((HTAB *, const char *, const HASHINFO *));
-static int init_htab __P((HTAB *, int));
-#if BYTE_ORDER == LITTLE_ENDIAN
-static void swap_header __P((HTAB *));
-static void swap_header_copy __P((HASHHDR *, HASHHDR *));
-#endif
-
-/* Fast arithmetic, relying on powers of 2, */
-#define MOD(x, y) ((x) & ((y) - 1))
-
-#define RETURN_ERROR(ERR, LOC) { save_errno = ERR; goto LOC; }
-
-/* Return values */
-#define SUCCESS (0)
-#define ERROR (-1)
-#define ABNORMAL (1)
-
-#ifdef HASH_STATISTICS
-int hash_accesses, hash_collisions, hash_expansions, hash_overflows;
-#endif
-
-/************************** INTERFACE ROUTINES ***************************/
-/* OPEN/CLOSE */
-
-extern DB *
-__hash_open(file, flags, mode, info, dflags)
- const char *file;
- int flags, mode, dflags;
- const HASHINFO *info; /* Special directives for create */
-{
- HTAB *hashp;
- struct stat statbuf;
- DB *dbp;
- int bpages, hdrsize, new_table, nsegs, save_errno;
-
- if ((flags & O_ACCMODE) == O_WRONLY) {
- errno = EINVAL;
- return (NULL);
- }
-
- if (!(hashp = (HTAB *)calloc(1, sizeof(HTAB))))
- return (NULL);
- hashp->fp = -1;
-
- /*
- * Even if user wants write only, we need to be able to read
- * the actual file, so we need to open it read/write. But, the
- * field in the hashp structure needs to be accurate so that
- * we can check accesses.
- */
- hashp->flags = flags;
-
- new_table = 0;
- if (!file || (flags & O_TRUNC) ||
- (stat(file, &statbuf) && (errno == ENOENT))) {
- if (errno == ENOENT)
- errno = 0; /* Just in case someone looks at errno */
- new_table = 1;
- }
- if (file) {
- if ((hashp->fp = open(file, flags, mode)) == -1)
- RETURN_ERROR(errno, error0);
- (void)fcntl(hashp->fp, F_SETFD, 1);
- }
- if (new_table) {
- if (!(hashp = init_hash(hashp, file, info)))
- RETURN_ERROR(errno, error1);
- } else {
- /* Table already exists */
- if (info && info->hash)
- hashp->hash = info->hash;
- else
- hashp->hash = __default_hash;
-
- hdrsize = read(hashp->fp, &hashp->hdr, sizeof(HASHHDR));
-#if BYTE_ORDER == LITTLE_ENDIAN
- swap_header(hashp);
-#endif
- if (hdrsize == -1)
- RETURN_ERROR(errno, error1);
- if (hdrsize != sizeof(HASHHDR))
- RETURN_ERROR(EFTYPE, error1);
- /* Verify file type, versions and hash function */
- if (hashp->MAGIC != HASHMAGIC)
- RETURN_ERROR(EFTYPE, error1);
-#define OLDHASHVERSION 1
- if (hashp->VERSION != HASHVERSION &&
- hashp->VERSION != OLDHASHVERSION)
- RETURN_ERROR(EFTYPE, error1);
- if (hashp->hash(CHARKEY, sizeof(CHARKEY))
- != (u_int32_t) hashp->H_CHARKEY)
- RETURN_ERROR(EFTYPE, error1);
- /*
- * Figure out how many segments we need. Max_Bucket is the
- * maximum bucket number, so the number of buckets is
- * max_bucket + 1.
- */
- nsegs = (hashp->MAX_BUCKET + 1 + hashp->SGSIZE - 1) /
- hashp->SGSIZE;
- hashp->nsegs = 0;
- if (alloc_segs(hashp, nsegs))
- /*
- * If alloc_segs fails, table will have been destroyed
- * and errno will have been set.
- */
- return (NULL);
- /* Read in bitmaps */
- bpages = (hashp->SPARES[hashp->OVFL_POINT] +
- (hashp->BSIZE << BYTE_SHIFT) - 1) >>
- (hashp->BSHIFT + BYTE_SHIFT);
-
- hashp->nmaps = bpages;
- (void)memset(&hashp->mapp[0], 0, bpages * sizeof(u_int32_t *));
- }
-
- /* Initialize Buffer Manager */
- if (info && info->cachesize)
- __buf_init(hashp, info->cachesize);
- else
- __buf_init(hashp, DEF_BUFSIZE);
-
- hashp->new_file = new_table;
- hashp->save_file = file && (hashp->flags & O_ACCMODE) != O_RDONLY;
- hashp->cbucket = -1;
- if (!(dbp = (DB *)malloc(sizeof(DB)))) {
- save_errno = errno;
- hdestroy(hashp);
- errno = save_errno;
- return (NULL);
- }
- dbp->internal = hashp;
- dbp->close = hash_close;
- dbp->del = hash_delete;
- dbp->fd = hash_fd;
- dbp->get = hash_get;
- dbp->put = hash_put;
- dbp->seq = hash_seq;
- dbp->sync = hash_sync;
- dbp->type = DB_HASH;
-
-#ifdef DEBUG
- (void)fprintf(stderr,
-"%s\n%s%x\n%s%d\n%s%d\n%s%d\n%s%d\n%s%d\n%s%d\n%s%d\n%s%d\n%s%d\n%s%x\n%s%x\n%s%d\n%s%d\n",
- "init_htab:",
- "TABLE POINTER ", hashp,
- "BUCKET SIZE ", hashp->BSIZE,
- "BUCKET SHIFT ", hashp->BSHIFT,
- "DIRECTORY SIZE ", hashp->DSIZE,
- "SEGMENT SIZE ", hashp->SGSIZE,
- "SEGMENT SHIFT ", hashp->SSHIFT,
- "FILL FACTOR ", hashp->FFACTOR,
- "MAX BUCKET ", hashp->MAX_BUCKET,
- "OVFL POINT ", hashp->OVFL_POINT,
- "LAST FREED ", hashp->LAST_FREED,
- "HIGH MASK ", hashp->HIGH_MASK,
- "LOW MASK ", hashp->LOW_MASK,
- "NSEGS ", hashp->nsegs,
- "NKEYS ", hashp->NKEYS);
-#endif
-#ifdef HASH_STATISTICS
- hash_overflows = hash_accesses = hash_collisions = hash_expansions = 0;
-#endif
- return (dbp);
-
-error1:
- if (hashp != NULL)
- (void)close(hashp->fp);
-
-error0:
- free(hashp);
- errno = save_errno;
- return (NULL);
-}
-
-static int
-hash_close(dbp)
- DB *dbp;
-{
- HTAB *hashp;
- int retval;
-
- if (!dbp)
- return (ERROR);
-
- hashp = (HTAB *)dbp->internal;
- retval = hdestroy(hashp);
- free(dbp);
- return (retval);
-}
-
-static int
-hash_fd(dbp)
- const DB *dbp;
-{
- HTAB *hashp;
-
- if (!dbp)
- return (ERROR);
-
- hashp = (HTAB *)dbp->internal;
- if (hashp->fp == -1) {
- errno = ENOENT;
- return (-1);
- }
- return (hashp->fp);
-}
-
-/************************** LOCAL CREATION ROUTINES **********************/
-static HTAB *
-init_hash(hashp, file, info)
- HTAB *hashp;
- const char *file;
- const HASHINFO *info;
-{
-#ifdef _STATBUF_ST_BLKSIZE
- struct stat statbuf;
-#endif
- int nelem;
-
- nelem = 1;
- hashp->NKEYS = 0;
- hashp->LORDER = BYTE_ORDER;
- hashp->BSIZE = DEF_BUCKET_SIZE;
- hashp->BSHIFT = DEF_BUCKET_SHIFT;
- hashp->SGSIZE = DEF_SEGSIZE;
- hashp->SSHIFT = DEF_SEGSIZE_SHIFT;
- hashp->DSIZE = DEF_DIRSIZE;
- hashp->FFACTOR = DEF_FFACTOR;
- hashp->hash = __default_hash;
- memset(hashp->SPARES, 0, sizeof(hashp->SPARES));
- memset(hashp->BITMAPS, 0, sizeof (hashp->BITMAPS));
-
- /* Fix bucket size to be optimal for file system */
-#ifdef _STATBUF_ST_BLKSIZE
- if (file != NULL) {
- if (stat(file, &statbuf))
- return (NULL);
- hashp->BSIZE = statbuf.st_blksize;
- hashp->BSHIFT = __hash_log2(hashp->BSIZE);
- }
-#endif
-
- if (info) {
- if (info->bsize) {
- /* Round pagesize up to power of 2 */
- hashp->BSHIFT = __hash_log2(info->bsize);
- hashp->BSIZE = 1 << hashp->BSHIFT;
- if (hashp->BSIZE > MAX_BSIZE) {
- errno = EINVAL;
- return (NULL);
- }
- }
- if (info->ffactor)
- hashp->FFACTOR = info->ffactor;
- if (info->hash)
- hashp->hash = info->hash;
- if (info->nelem)
- nelem = info->nelem;
- if (info->lorder) {
- if (info->lorder != BIG_ENDIAN &&
- info->lorder != LITTLE_ENDIAN) {
- errno = EINVAL;
- return (NULL);
- }
- hashp->LORDER = info->lorder;
- }
- }
- /* init_htab should destroy the table and set errno if it fails */
- if (init_htab(hashp, nelem))
- return (NULL);
- else
- return (hashp);
-}
-/*
- * This calls alloc_segs which may run out of memory. Alloc_segs will destroy
- * the table and set errno, so we just pass the error information along.
- *
- * Returns 0 on No Error
- */
-static int
-init_htab(hashp, nelem)
- HTAB *hashp;
- int nelem;
-{
- register int nbuckets, nsegs;
- int l2;
-
- /*
- * Divide number of elements by the fill factor and determine a
- * desired number of buckets. Allocate space for the next greater
- * power of two number of buckets.
- */
- nelem = (nelem - 1) / hashp->FFACTOR + 1;
-
- l2 = __hash_log2(MAX(nelem, 2));
- nbuckets = 1 << l2;
-
- hashp->SPARES[l2] = l2 + 1;
- hashp->SPARES[l2 + 1] = l2 + 1;
- hashp->OVFL_POINT = l2;
- hashp->LAST_FREED = 2;
-
- /* First bitmap page is at: splitpoint l2 page offset 1 */
- if (__ibitmap(hashp, OADDR_OF(l2, 1), l2 + 1, 0))
- return (-1);
-
- hashp->MAX_BUCKET = hashp->LOW_MASK = nbuckets - 1;
- hashp->HIGH_MASK = (nbuckets << 1) - 1;
- hashp->HDRPAGES = ((MAX(sizeof(HASHHDR), MINHDRSIZE) - 1) >>
- hashp->BSHIFT) + 1;
-
- nsegs = (nbuckets - 1) / hashp->SGSIZE + 1;
- nsegs = 1 << __hash_log2(nsegs);
-
- if (nsegs > hashp->DSIZE)
- hashp->DSIZE = nsegs;
- return (alloc_segs(hashp, nsegs));
-}
-
-/********************** DESTROY/CLOSE ROUTINES ************************/
-
-/*
- * Flushes any changes to the file if necessary and destroys the hashp
- * structure, freeing all allocated space.
- */
-static int
-hdestroy(hashp)
- HTAB *hashp;
-{
- int i, save_errno;
-
- save_errno = 0;
-
-#ifdef HASH_STATISTICS
- (void)fprintf(stderr, "hdestroy: accesses %ld collisions %ld\n",
- hash_accesses, hash_collisions);
- (void)fprintf(stderr, "hdestroy: expansions %ld\n",
- hash_expansions);
- (void)fprintf(stderr, "hdestroy: overflows %ld\n",
- hash_overflows);
- (void)fprintf(stderr, "keys %ld maxp %d segmentcount %d\n",
- hashp->NKEYS, hashp->MAX_BUCKET, hashp->nsegs);
-
- for (i = 0; i < NCACHED; i++)
- (void)fprintf(stderr,
- "spares[%d] = %d\n", i, hashp->SPARES[i]);
-#endif
- /*
- * Call on buffer manager to free buffers, and if required,
- * write them to disk.
- */
- if (__buf_free(hashp, 1, hashp->save_file))
- save_errno = errno;
- if (hashp->dir) {
- free(*hashp->dir); /* Free initial segments */
- /* Free extra segments */
- while (hashp->exsegs--)
- free(hashp->dir[--hashp->nsegs]);
- free(hashp->dir);
- }
- if (flush_meta(hashp) && !save_errno)
- save_errno = errno;
- /* Free Bigmaps */
- for (i = 0; i < hashp->nmaps; i++)
- if (hashp->mapp[i])
- free(hashp->mapp[i]);
-
- if (hashp->fp != -1)
- (void)close(hashp->fp);
-
- free(hashp);
-
- if (save_errno) {
- errno = save_errno;
- return (ERROR);
- }
- return (SUCCESS);
-}
-/*
- * Write modified pages to disk
- *
- * Returns:
- * 0 == OK
- * -1 ERROR
- */
-static int
-hash_sync(dbp, flags)
- const DB *dbp;
- u_int32_t flags;
-{
- HTAB *hashp;
-
- if (flags != 0) {
- errno = EINVAL;
- return (ERROR);
- }
-
- if (!dbp)
- return (ERROR);
-
- hashp = (HTAB *)dbp->internal;
- if (!hashp->save_file)
- return (0);
- if (__buf_free(hashp, 0, 1) || flush_meta(hashp))
- return (ERROR);
- hashp->new_file = 0;
- return (0);
-}
-
-/*
- * Returns:
- * 0 == OK
- * -1 indicates that errno should be set
- */
-static int
-flush_meta(hashp)
- HTAB *hashp;
-{
- HASHHDR *whdrp;
-#if BYTE_ORDER == LITTLE_ENDIAN
- HASHHDR whdr;
-#endif
- int fp, i, wsize;
-
- if (!hashp->save_file)
- return (0);
- hashp->MAGIC = HASHMAGIC;
- hashp->VERSION = HASHVERSION;
- hashp->H_CHARKEY = hashp->hash(CHARKEY, sizeof(CHARKEY));
-
- fp = hashp->fp;
- whdrp = &hashp->hdr;
-#if BYTE_ORDER == LITTLE_ENDIAN
- whdrp = &whdr;
- swap_header_copy(&hashp->hdr, whdrp);
-#endif
- if ((lseek(fp, (off_t)0, SEEK_SET) == -1) ||
- ((wsize = write(fp, whdrp, sizeof(HASHHDR))) == -1))
- return (-1);
- else
- if (wsize != sizeof(HASHHDR)) {
- errno = EFTYPE;
- hashp->errnum = errno;
- return (-1);
- }
- for (i = 0; i < NCACHED; i++)
- if (hashp->mapp[i])
- if (__put_page(hashp, (char *)hashp->mapp[i],
- hashp->BITMAPS[i], 0, 1))
- return (-1);
- return (0);
-}
-
-/*******************************SEARCH ROUTINES *****************************/
-/*
- * All the access routines return
- *
- * Returns:
- * 0 on SUCCESS
- * 1 to indicate an external ERROR (i.e. key not found, etc)
- * -1 to indicate an internal ERROR (i.e. out of memory, etc)
- */
-static int
-hash_get(dbp, key, data, flag)
- const DB *dbp;
- const DBT *key;
- DBT *data;
- u_int32_t flag;
-{
- HTAB *hashp;
-
- hashp = (HTAB *)dbp->internal;
- if (flag) {
- hashp->errnum = errno = EINVAL;
- return (ERROR);
- }
- return (hash_access(hashp, HASH_GET, (DBT *)key, data));
-}
-
-static int
-hash_put(dbp, key, data, flag)
- const DB *dbp;
- DBT *key;
- const DBT *data;
- u_int32_t flag;
-{
- HTAB *hashp;
-
- hashp = (HTAB *)dbp->internal;
- if (flag && flag != R_NOOVERWRITE) {
- hashp->errnum = errno = EINVAL;
- return (ERROR);
- }
- if ((hashp->flags & O_ACCMODE) == O_RDONLY) {
- hashp->errnum = errno = EPERM;
- return (ERROR);
- }
- return (hash_access(hashp, flag == R_NOOVERWRITE ?
- HASH_PUTNEW : HASH_PUT, (DBT *)key, (DBT *)data));
-}
-
-static int
-hash_delete(dbp, key, flag)
- const DB *dbp;
- const DBT *key;
- u_int32_t flag; /* Ignored */
-{
- HTAB *hashp;
-
- hashp = (HTAB *)dbp->internal;
- if (flag && flag != R_CURSOR) {
- hashp->errnum = errno = EINVAL;
- return (ERROR);
- }
- if ((hashp->flags & O_ACCMODE) == O_RDONLY) {
- hashp->errnum = errno = EPERM;
- return (ERROR);
- }
- return (hash_access(hashp, HASH_DELETE, (DBT *)key, NULL));
-}
-
-/*
- * Assume that hashp has been set in wrapper routine.
- */
-static int
-hash_access(hashp, action, key, val)
- HTAB *hashp;
- ACTION action;
- DBT *key, *val;
-{
- register BUFHEAD *rbufp;
- BUFHEAD *bufp, *save_bufp;
- register u_int16_t *bp;
- register int n, ndx, off, size;
- register char *kp;
- u_int16_t pageno;
-
-#ifdef HASH_STATISTICS
- hash_accesses++;
-#endif
-
- off = hashp->BSIZE;
- size = key->size;
- kp = (char *)key->data;
- rbufp = __get_buf(hashp, __call_hash(hashp, kp, size), NULL, 0);
- if (!rbufp)
- return (ERROR);
- save_bufp = rbufp;
-
- /* Pin the bucket chain */
- rbufp->flags |= BUF_PIN;
- for (bp = (u_int16_t *)rbufp->page, n = *bp++, ndx = 1; ndx < n;)
- if (bp[1] >= REAL_KEY) {
- /* Real key/data pair */
- if (size == off - *bp &&
- memcmp(kp, rbufp->page + *bp, size) == 0)
- goto found;
- off = bp[1];
-#ifdef HASH_STATISTICS
- hash_collisions++;
-#endif
- bp += 2;
- ndx += 2;
- } else if (bp[1] == OVFLPAGE) {
- rbufp = __get_buf(hashp, *bp, rbufp, 0);
- if (!rbufp) {
- save_bufp->flags &= ~BUF_PIN;
- return (ERROR);
- }
- /* FOR LOOP INIT */
- bp = (u_int16_t *)rbufp->page;
- n = *bp++;
- ndx = 1;
- off = hashp->BSIZE;
- } else if (bp[1] < REAL_KEY) {
- if ((ndx =
- __find_bigpair(hashp, rbufp, ndx, kp, size)) > 0)
- goto found;
- if (ndx == -2) {
- bufp = rbufp;
- if (!(pageno =
- __find_last_page(hashp, &bufp))) {
- ndx = 0;
- rbufp = bufp;
- break; /* FOR */
- }
- rbufp = __get_buf(hashp, pageno, bufp, 0);
- if (!rbufp) {
- save_bufp->flags &= ~BUF_PIN;
- return (ERROR);
- }
- /* FOR LOOP INIT */
- bp = (u_int16_t *)rbufp->page;
- n = *bp++;
- ndx = 1;
- off = hashp->BSIZE;
- } else {
- save_bufp->flags &= ~BUF_PIN;
- return (ERROR);
- }
- }
-
- /* Not found */
- switch (action) {
- case HASH_PUT:
- case HASH_PUTNEW:
- if (__addel(hashp, rbufp, key, val)) {
- save_bufp->flags &= ~BUF_PIN;
- return (ERROR);
- } else {
- save_bufp->flags &= ~BUF_PIN;
- return (SUCCESS);
- }
- case HASH_GET:
- case HASH_DELETE:
- default:
- save_bufp->flags &= ~BUF_PIN;
- return (ABNORMAL);
- }
-
-found:
- switch (action) {
- case HASH_PUTNEW:
- save_bufp->flags &= ~BUF_PIN;
- return (ABNORMAL);
- case HASH_GET:
- bp = (u_int16_t *)rbufp->page;
- if (bp[ndx + 1] < REAL_KEY) {
- if (__big_return(hashp, rbufp, ndx, val, 0))
- return (ERROR);
- } else {
- val->data = (u_char *)rbufp->page + (int)bp[ndx + 1];
- val->size = bp[ndx] - bp[ndx + 1];
- }
- break;
- case HASH_PUT:
- if ((__delpair(hashp, rbufp, ndx)) ||
- (__addel(hashp, rbufp, key, val))) {
- save_bufp->flags &= ~BUF_PIN;
- return (ERROR);
- }
- break;
- case HASH_DELETE:
- if (__delpair(hashp, rbufp, ndx))
- return (ERROR);
- break;
- default:
- abort();
- }
- save_bufp->flags &= ~BUF_PIN;
- return (SUCCESS);
-}
-
-static int
-hash_seq(dbp, key, data, flag)
- const DB *dbp;
- DBT *key, *data;
- u_int32_t flag;
-{
- register u_int32_t bucket;
- register BUFHEAD *bufp = NULL;
- HTAB *hashp;
- u_int16_t *bp, ndx;
-
- hashp = (HTAB *)dbp->internal;
- if (flag && flag != R_FIRST && flag != R_NEXT) {
- hashp->errnum = errno = EINVAL;
- return (ERROR);
- }
-#ifdef HASH_STATISTICS
- hash_accesses++;
-#endif
- if ((hashp->cbucket < 0) || (flag == R_FIRST)) {
- hashp->cbucket = 0;
- hashp->cndx = 1;
- hashp->cpage = NULL;
- }
-
- for (bp = NULL; !bp || !bp[0]; ) {
- if (!(bufp = hashp->cpage)) {
- for (bucket = hashp->cbucket;
- bucket <= (u_int32_t) hashp->MAX_BUCKET;
- bucket++, hashp->cndx = 1) {
- bufp = __get_buf(hashp, bucket, NULL, 0);
- if (!bufp)
- return (ERROR);
- hashp->cpage = bufp;
- bp = (u_int16_t *)bufp->page;
- if (bp[0])
- break;
- }
- hashp->cbucket = bucket;
- if (hashp->cbucket > hashp->MAX_BUCKET) {
- hashp->cbucket = -1;
- return (ABNORMAL);
- }
- } else
- bp = (u_int16_t *)hashp->cpage->page;
-
-#ifdef DEBUG
- assert(bp);
- assert(bufp);
-#endif
- while (bp[hashp->cndx + 1] == OVFLPAGE) {
- bufp = hashp->cpage =
- __get_buf(hashp, bp[hashp->cndx], bufp, 0);
- if (!bufp)
- return (ERROR);
- bp = (u_int16_t *)(bufp->page);
- hashp->cndx = 1;
- }
- if (!bp[0]) {
- hashp->cpage = NULL;
- ++hashp->cbucket;
- }
- }
- ndx = hashp->cndx;
- if (bp[ndx + 1] < REAL_KEY) {
- if (__big_keydata(hashp, bufp, key, data, 1))
- return (ERROR);
- } else {
- key->data = (u_char *)hashp->cpage->page + bp[ndx];
- key->size = (ndx > 1 ? bp[ndx - 1] : hashp->BSIZE) - bp[ndx];
- data->data = (u_char *)hashp->cpage->page + bp[ndx + 1];
- data->size = bp[ndx] - bp[ndx + 1];
- ndx += 2;
- if (ndx > bp[0]) {
- hashp->cpage = NULL;
- hashp->cbucket++;
- hashp->cndx = 1;
- } else
- hashp->cndx = ndx;
- }
- return (SUCCESS);
-}
-
-/********************************* UTILITIES ************************/
-
-/*
- * Returns:
- * 0 ==> OK
- * -1 ==> Error
- */
-extern int
-__expand_table(hashp)
- HTAB *hashp;
-{
- u_int32_t old_bucket, new_bucket;
- int dirsize, new_segnum, spare_ndx;
-
-#ifdef HASH_STATISTICS
- hash_expansions++;
-#endif
- new_bucket = ++hashp->MAX_BUCKET;
- old_bucket = (hashp->MAX_BUCKET & hashp->LOW_MASK);
-
- new_segnum = new_bucket >> hashp->SSHIFT;
-
- /* Check if we need a new segment */
- if (new_segnum >= hashp->nsegs) {
- /* Check if we need to expand directory */
- if (new_segnum >= hashp->DSIZE) {
- /* Reallocate directory */
- dirsize = hashp->DSIZE * sizeof(SEGMENT *);
- if (!hash_realloc(&hashp->dir, dirsize, dirsize << 1))
- return (-1);
- hashp->DSIZE = dirsize << 1;
- }
- if ((hashp->dir[new_segnum] =
- (SEGMENT)calloc(hashp->SGSIZE, sizeof(SEGMENT))) == NULL)
- return (-1);
- hashp->exsegs++;
- hashp->nsegs++;
- }
- /*
- * If the split point is increasing (MAX_BUCKET's log base 2
- * * increases), we need to copy the current contents of the spare
- * split bucket to the next bucket.
- */
- spare_ndx = __hash_log2(hashp->MAX_BUCKET + 1);
- if (spare_ndx > hashp->OVFL_POINT) {
- hashp->SPARES[spare_ndx] = hashp->SPARES[hashp->OVFL_POINT];
- hashp->OVFL_POINT = spare_ndx;
- }
-
- if (new_bucket > (u_int32_t) hashp->HIGH_MASK) {
- /* Starting a new doubling */
- hashp->LOW_MASK = hashp->HIGH_MASK;
- hashp->HIGH_MASK = new_bucket | hashp->LOW_MASK;
- }
- /* Relocate records to the new bucket */
- return (__split_page(hashp, old_bucket, new_bucket));
-}
-
-/*
- * If realloc guarantees that the pointer is not destroyed if the realloc
- * fails, then this routine can go away.
- */
-static void *
-hash_realloc(p_ptr, oldsize, newsize)
- SEGMENT **p_ptr;
- int oldsize, newsize;
-{
- register void *p;
-
- if ((p = malloc(newsize))) {
- memmove(p, *p_ptr, oldsize);
- memset((char *)p + oldsize, 0, newsize - oldsize);
- free(*p_ptr);
- *p_ptr = p;
- }
- return (p);
-}
-
-extern u_int32_t
-__call_hash(hashp, k, len)
- HTAB *hashp;
- char *k;
- int len;
-{
- int n, bucket;
-
- n = hashp->hash(k, len);
- bucket = n & hashp->HIGH_MASK;
- if (bucket > hashp->MAX_BUCKET)
- bucket = bucket & hashp->LOW_MASK;
- return (bucket);
-}
-
-/*
- * Allocate segment table. On error, destroy the table and set errno.
- *
- * Returns 0 on success
- */
-static int
-alloc_segs(hashp, nsegs)
- HTAB *hashp;
- int nsegs;
-{
- register int i;
- register SEGMENT store;
-
- int save_errno;
-
- if ((hashp->dir =
- (SEGMENT *)calloc(hashp->DSIZE, sizeof(SEGMENT *))) == NULL) {
- save_errno = errno;
- (void)hdestroy(hashp);
- errno = save_errno;
- return (-1);
- }
- /* Allocate segments */
- if ((store =
- (SEGMENT)calloc(nsegs << hashp->SSHIFT, sizeof(SEGMENT))) == NULL) {
- save_errno = errno;
- (void)hdestroy(hashp);
- errno = save_errno;
- return (-1);
- }
- for (i = 0; i < nsegs; i++, hashp->nsegs++)
- hashp->dir[i] = &store[i << hashp->SSHIFT];
- return (0);
-}
-
-#if BYTE_ORDER == LITTLE_ENDIAN
-/*
- * Hashp->hdr needs to be byteswapped.
- */
-static void
-swap_header_copy(srcp, destp)
- HASHHDR *srcp, *destp;
-{
- int i;
-
- P_32_COPY(srcp->magic, destp->magic);
- P_32_COPY(srcp->version, destp->version);
- P_32_COPY(srcp->lorder, destp->lorder);
- P_32_COPY(srcp->bsize, destp->bsize);
- P_32_COPY(srcp->bshift, destp->bshift);
- P_32_COPY(srcp->dsize, destp->dsize);
- P_32_COPY(srcp->ssize, destp->ssize);
- P_32_COPY(srcp->sshift, destp->sshift);
- P_32_COPY(srcp->ovfl_point, destp->ovfl_point);
- P_32_COPY(srcp->last_freed, destp->last_freed);
- P_32_COPY(srcp->max_bucket, destp->max_bucket);
- P_32_COPY(srcp->high_mask, destp->high_mask);
- P_32_COPY(srcp->low_mask, destp->low_mask);
- P_32_COPY(srcp->ffactor, destp->ffactor);
- P_32_COPY(srcp->nkeys, destp->nkeys);
- P_32_COPY(srcp->hdrpages, destp->hdrpages);
- P_32_COPY(srcp->h_charkey, destp->h_charkey);
- for (i = 0; i < NCACHED; i++) {
- P_32_COPY(srcp->spares[i], destp->spares[i]);
- P_16_COPY(srcp->bitmaps[i], destp->bitmaps[i]);
- }
-}
-
-static void
-swap_header(hashp)
- HTAB *hashp;
-{
- HASHHDR *hdrp;
- int i;
-
- hdrp = &hashp->hdr;
-
- M_32_SWAP(hdrp->magic);
- M_32_SWAP(hdrp->version);
- M_32_SWAP(hdrp->lorder);
- M_32_SWAP(hdrp->bsize);
- M_32_SWAP(hdrp->bshift);
- M_32_SWAP(hdrp->dsize);
- M_32_SWAP(hdrp->ssize);
- M_32_SWAP(hdrp->sshift);
- M_32_SWAP(hdrp->ovfl_point);
- M_32_SWAP(hdrp->last_freed);
- M_32_SWAP(hdrp->max_bucket);
- M_32_SWAP(hdrp->high_mask);
- M_32_SWAP(hdrp->low_mask);
- M_32_SWAP(hdrp->ffactor);
- M_32_SWAP(hdrp->nkeys);
- M_32_SWAP(hdrp->hdrpages);
- M_32_SWAP(hdrp->h_charkey);
- for (i = 0; i < NCACHED; i++) {
- M_32_SWAP(hdrp->spares[i]);
- M_16_SWAP(hdrp->bitmaps[i]);
- }
-}
-#endif
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Margo Seltzer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)hash.h 8.3 (Berkeley) 5/31/94
- */
-
-/* Operations */
-typedef enum {
- HASH_GET, HASH_PUT, HASH_PUTNEW, HASH_DELETE, HASH_FIRST, HASH_NEXT
-} ACTION;
-
-/* Buffer Management structures */
-typedef struct _bufhead BUFHEAD;
-
-struct _bufhead {
- BUFHEAD *prev; /* LRU links */
- BUFHEAD *next; /* LRU links */
- BUFHEAD *ovfl; /* Overflow page buffer header */
- u_int32_t addr; /* Address of this page */
- char *page; /* Actual page data */
- char flags;
-#define BUF_MOD 0x0001
-#define BUF_DISK 0x0002
-#define BUF_BUCKET 0x0004
-#define BUF_PIN 0x0008
-};
-
-#define IS_BUCKET(X) ((X) & BUF_BUCKET)
-
-typedef BUFHEAD **SEGMENT;
-
-/* Hash Table Information */
-typedef struct hashhdr { /* Disk resident portion */
- int magic; /* Magic NO for hash tables */
- int version; /* Version ID */
- u_int32_t lorder; /* Byte Order */
- int bsize; /* Bucket/Page Size */
- int bshift; /* Bucket shift */
- int dsize; /* Directory Size */
- int ssize; /* Segment Size */
- int sshift; /* Segment shift */
- int ovfl_point; /* Where overflow pages are being
- * allocated */
- int last_freed; /* Last overflow page freed */
- int max_bucket; /* ID of Maximum bucket in use */
- int high_mask; /* Mask to modulo into entire table */
- int low_mask; /* Mask to modulo into lower half of
- * table */
- int ffactor; /* Fill factor */
- int nkeys; /* Number of keys in hash table */
- int hdrpages; /* Size of table header */
- int h_charkey; /* value of hash(CHARKEY) */
-#define NCACHED 32 /* number of bit maps and spare
- * points */
- int spares[NCACHED];/* spare pages for overflow */
- u_int16_t bitmaps[NCACHED]; /* address of overflow page
- * bitmaps */
-} HASHHDR;
-
-typedef struct htab { /* Memory resident data structure */
- HASHHDR hdr; /* Header */
- int nsegs; /* Number of allocated segments */
- int exsegs; /* Number of extra allocated
- * segments */
- u_int32_t /* Hash function */
- (*hash)__P((const void *, size_t));
- int flags; /* Flag values */
- int fp; /* File pointer */
- char *tmp_buf; /* Temporary Buffer for BIG data */
- char *tmp_key; /* Temporary Buffer for BIG keys */
- BUFHEAD *cpage; /* Current page */
- int cbucket; /* Current bucket */
- int cndx; /* Index of next item on cpage */
- int errnum; /* Error Number -- for DBM
- * compatibility */
- int new_file; /* Indicates if fd is backing store
- * or no */
- int save_file; /* Indicates whether we need to flush
- * file at
- * exit */
- u_int32_t *mapp[NCACHED]; /* Pointers to page maps */
- int nmaps; /* Initial number of bitmaps */
- int nbufs; /* Number of buffers left to
- * allocate */
- BUFHEAD bufhead; /* Header of buffer lru list */
- SEGMENT *dir; /* Hash Bucket directory */
-} HTAB;
-
-/*
- * Constants
- */
-#define MAX_BSIZE 65536 /* 2^16 */
-#define MIN_BUFFERS 6
-#define MINHDRSIZE 512
-#define DEF_BUFSIZE 65536 /* 64 K */
-#define DEF_BUCKET_SIZE 4096
-#define DEF_BUCKET_SHIFT 12 /* log2(BUCKET) */
-#define DEF_SEGSIZE 256
-#define DEF_SEGSIZE_SHIFT 8 /* log2(SEGSIZE) */
-#define DEF_DIRSIZE 256
-#define DEF_FFACTOR 65536
-#define MIN_FFACTOR 4
-#define SPLTMAX 8
-#define CHARKEY "%$sniglet^&"
-#define NUMKEY 1038583
-#define BYTE_SHIFT 3
-#define INT_TO_BYTE 2
-#define INT_BYTE_SHIFT 5
-#define ALL_SET ((u_int32_t)0xFFFFFFFF)
-#define ALL_CLEAR 0
-
-#define PTROF(X) ((BUFHEAD *)((ptrdiff_t)(X)&~0x3))
-#define ISMOD(X) ((u_int32_t)(ptrdiff_t)(X)&0x1)
-#define DOMOD(X) ((X) = (char *)((ptrdiff_t)(X)|0x1))
-#define ISDISK(X) ((u_int32_t)(ptrdiff_t)(X)&0x2)
-#define DODISK(X) ((X) = (char *)((ptrdiff_t)(X)|0x2))
-
-#define BITS_PER_MAP 32
-
-/* Given the address of the beginning of a big map, clear/set the nth bit */
-#define CLRBIT(A, N) ((A)[(N)/BITS_PER_MAP] &= ~(1<<((N)%BITS_PER_MAP)))
-#define SETBIT(A, N) ((A)[(N)/BITS_PER_MAP] |= (1<<((N)%BITS_PER_MAP)))
-#define ISSET(A, N) ((A)[(N)/BITS_PER_MAP] & (1<<((N)%BITS_PER_MAP)))
-
-/* Overflow management */
-/*
- * Overflow page numbers are allocated per split point. At each doubling of
- * the table, we can allocate extra pages. So, an overflow page number has
- * the top 5 bits indicate which split point and the lower 11 bits indicate
- * which page at that split point is indicated (pages within split points are
- * numbered starting with 1).
- */
-
-#define SPLITSHIFT 11
-#define SPLITMASK 0x7FF
-#define SPLITNUM(N) (((u_int32_t)(N)) >> SPLITSHIFT)
-#define OPAGENUM(N) ((N) & SPLITMASK)
-#define OADDR_OF(S,O) ((u_int32_t)((u_int32_t)(S) << SPLITSHIFT) + (O))
-
-#define BUCKET_TO_PAGE(B) \
- (B) + hashp->HDRPAGES + ((B) ? hashp->SPARES[__hash_log2((B)+1)-1] : 0)
-#define OADDR_TO_PAGE(B) \
- BUCKET_TO_PAGE ( (1 << SPLITNUM((B))) -1 ) + OPAGENUM((B));
-
-/*
- * page.h contains a detailed description of the page format.
- *
- * Normally, keys and data are accessed from offset tables in the top of
- * each page which point to the beginning of the key and data. There are
- * four flag values which may be stored in these offset tables which indicate
- * the following:
- *
- *
- * OVFLPAGE Rather than a key data pair, this pair contains
- * the address of an overflow page. The format of
- * the pair is:
- * OVERFLOW_PAGE_NUMBER OVFLPAGE
- *
- * PARTIAL_KEY This must be the first key/data pair on a page
- * and implies that page contains only a partial key.
- * That is, the key is too big to fit on a single page
- * so it starts on this page and continues on the next.
- * The format of the page is:
- * KEY_OFF PARTIAL_KEY OVFL_PAGENO OVFLPAGE
- *
- * KEY_OFF -- offset of the beginning of the key
- * PARTIAL_KEY -- 1
- * OVFL_PAGENO - page number of the next overflow page
- * OVFLPAGE -- 0
- *
- * FULL_KEY This must be the first key/data pair on the page. It
- * is used in two cases.
- *
- * Case 1:
- * There is a complete key on the page but no data
- * (because it wouldn't fit). The next page contains
- * the data.
- *
- * Page format it:
- * KEY_OFF FULL_KEY OVFL_PAGENO OVFL_PAGE
- *
- * KEY_OFF -- offset of the beginning of the key
- * FULL_KEY -- 2
- * OVFL_PAGENO - page number of the next overflow page
- * OVFLPAGE -- 0
- *
- * Case 2:
- * This page contains no key, but part of a large
- * data field, which is continued on the next page.
- *
- * Page format it:
- * DATA_OFF FULL_KEY OVFL_PAGENO OVFL_PAGE
- *
- * KEY_OFF -- offset of the beginning of the data on
- * this page
- * FULL_KEY -- 2
- * OVFL_PAGENO - page number of the next overflow page
- * OVFLPAGE -- 0
- *
- * FULL_KEY_DATA
- * This must be the first key/data pair on the page.
- * There are two cases:
- *
- * Case 1:
- * This page contains a key and the beginning of the
- * data field, but the data field is continued on the
- * next page.
- *
- * Page format is:
- * KEY_OFF FULL_KEY_DATA OVFL_PAGENO DATA_OFF
- *
- * KEY_OFF -- offset of the beginning of the key
- * FULL_KEY_DATA -- 3
- * OVFL_PAGENO - page number of the next overflow page
- * DATA_OFF -- offset of the beginning of the data
- *
- * Case 2:
- * This page contains the last page of a big data pair.
- * There is no key, only the tail end of the data
- * on this page.
- *
- * Page format is:
- * DATA_OFF FULL_KEY_DATA <OVFL_PAGENO> <OVFLPAGE>
- *
- * DATA_OFF -- offset of the beginning of the data on
- * this page
- * FULL_KEY_DATA -- 3
- * OVFL_PAGENO - page number of the next overflow page
- * OVFLPAGE -- 0
- *
- * OVFL_PAGENO and OVFLPAGE are optional (they are
- * not present if there is no next page).
- */
-
-#define OVFLPAGE 0
-#define PARTIAL_KEY 1
-#define FULL_KEY 2
-#define FULL_KEY_DATA 3
-#define REAL_KEY 4
-
-/* Short hands for accessing structure */
-#define BSIZE hdr.bsize
-#define BSHIFT hdr.bshift
-#define DSIZE hdr.dsize
-#define SGSIZE hdr.ssize
-#define SSHIFT hdr.sshift
-#define LORDER hdr.lorder
-#define OVFL_POINT hdr.ovfl_point
-#define LAST_FREED hdr.last_freed
-#define MAX_BUCKET hdr.max_bucket
-#define FFACTOR hdr.ffactor
-#define HIGH_MASK hdr.high_mask
-#define LOW_MASK hdr.low_mask
-#define NKEYS hdr.nkeys
-#define HDRPAGES hdr.hdrpages
-#define SPARES hdr.spares
-#define BITMAPS hdr.bitmaps
-#define VERSION hdr.version
-#define MAGIC hdr.magic
-#define NEXT_FREE hdr.next_free
-#define H_CHARKEY hdr.h_charkey
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Margo Seltzer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)hash_bigkey.c 8.3 (Berkeley) 5/31/94";
-#endif /* LIBC_SCCS and not lint */
-
-/*
- * PACKAGE: hash
- * DESCRIPTION:
- * Big key/data handling for the hashing package.
- *
- * ROUTINES:
- * External
- * __big_keydata
- * __big_split
- * __big_insert
- * __big_return
- * __big_delete
- * __find_last_page
- * Internal
- * collect_key
- * collect_data
- */
-
-#include <sys/param.h>
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#ifdef DEBUG
-#include <assert.h>
-#endif
-
-#include "../include/db.h"
-#include "hash.h"
-#include "page.h"
-#include "extern.h"
-
-static int collect_key __P((HTAB *, BUFHEAD *, int, DBT *, int));
-static int collect_data __P((HTAB *, BUFHEAD *, int, int));
-
-/*
- * Big_insert
- *
- * You need to do an insert and the key/data pair is too big
- *
- * Returns:
- * 0 ==> OK
- *-1 ==> ERROR
- */
-extern int
-__big_insert(hashp, bufp, key, val)
- HTAB *hashp;
- BUFHEAD *bufp;
- const DBT *key, *val;
-{
- register u_int16_t *p;
- int key_size, n, val_size;
- u_int16_t space, move_bytes, off;
- char *cp, *key_data, *val_data;
-
- cp = bufp->page; /* Character pointer of p. */
- p = (u_int16_t *)cp;
-
- key_data = (char *)key->data;
- key_size = key->size;
- val_data = (char *)val->data;
- val_size = val->size;
-
- /* First move the Key */
- for (space = FREESPACE(p) - BIGOVERHEAD; key_size;
- space = FREESPACE(p) - BIGOVERHEAD) {
- move_bytes = MIN(space, key_size);
- off = OFFSET(p) - move_bytes;
- memmove(cp + off, key_data, move_bytes);
- key_size -= move_bytes;
- key_data += move_bytes;
- n = p[0];
- p[++n] = off;
- p[0] = ++n;
- FREESPACE(p) = off - PAGE_META(n);
- OFFSET(p) = off;
- p[n] = PARTIAL_KEY;
- bufp = __add_ovflpage(hashp, bufp);
- if (!bufp)
- return (-1);
- n = p[0];
- if (!key_size) {
- if (FREESPACE(p)) {
- move_bytes = MIN(FREESPACE(p), val_size);
- off = OFFSET(p) - move_bytes;
- p[n] = off;
- memmove(cp + off, val_data, move_bytes);
- val_data += move_bytes;
- val_size -= move_bytes;
- p[n - 2] = FULL_KEY_DATA;
- FREESPACE(p) = FREESPACE(p) - move_bytes;
- OFFSET(p) = off;
- } else
- p[n - 2] = FULL_KEY;
- }
- p = (u_int16_t *)bufp->page;
- cp = bufp->page;
- bufp->flags |= BUF_MOD;
- }
-
- /* Now move the data */
- for (space = FREESPACE(p) - BIGOVERHEAD; val_size;
- space = FREESPACE(p) - BIGOVERHEAD) {
- move_bytes = MIN(space, val_size);
- /*
- * Here's the hack to make sure that if the data ends on the
- * same page as the key ends, FREESPACE is at least one.
- */
- if ((int) space == val_size && (size_t) val_size == val->size)
- move_bytes--;
- off = OFFSET(p) - move_bytes;
- memmove(cp + off, val_data, move_bytes);
- val_size -= move_bytes;
- val_data += move_bytes;
- n = p[0];
- p[++n] = off;
- p[0] = ++n;
- FREESPACE(p) = off - PAGE_META(n);
- OFFSET(p) = off;
- if (val_size) {
- p[n] = FULL_KEY;
- bufp = __add_ovflpage(hashp, bufp);
- if (!bufp)
- return (-1);
- cp = bufp->page;
- p = (u_int16_t *)cp;
- } else
- p[n] = FULL_KEY_DATA;
- bufp->flags |= BUF_MOD;
- }
- return (0);
-}
-
-/*
- * Called when bufp's page contains a partial key (index should be 1)
- *
- * All pages in the big key/data pair except bufp are freed. We cannot
- * free bufp because the page pointing to it is lost and we can't get rid
- * of its pointer.
- *
- * Returns:
- * 0 => OK
- *-1 => ERROR
- */
-extern int
-__big_delete(hashp, bufp)
- HTAB *hashp;
- BUFHEAD *bufp;
-{
- register BUFHEAD *last_bfp, *rbufp;
- u_int16_t *bp, pageno;
- int key_done, n;
-
- rbufp = bufp;
- last_bfp = NULL;
- bp = (u_int16_t *)bufp->page;
- pageno = 0;
- key_done = 0;
-
- while (!key_done || (bp[2] != FULL_KEY_DATA)) {
- if (bp[2] == FULL_KEY || bp[2] == FULL_KEY_DATA)
- key_done = 1;
-
- /*
- * If there is freespace left on a FULL_KEY_DATA page, then
- * the data is short and fits entirely on this page, and this
- * is the last page.
- */
- if (bp[2] == FULL_KEY_DATA && FREESPACE(bp))
- break;
- pageno = bp[bp[0] - 1];
- rbufp->flags |= BUF_MOD;
- rbufp = __get_buf(hashp, pageno, rbufp, 0);
- if (last_bfp)
- __free_ovflpage(hashp, last_bfp);
- last_bfp = rbufp;
- if (!rbufp)
- return (-1); /* Error. */
- bp = (u_int16_t *)rbufp->page;
- }
-
- /*
- * If we get here then rbufp points to the last page of the big
- * key/data pair. Bufp points to the first one -- it should now be
- * empty pointing to the next page after this pair. Can't free it
- * because we don't have the page pointing to it.
- */
-
- /* This is information from the last page of the pair. */
- n = bp[0];
- pageno = bp[n - 1];
-
- /* Now, bp is the first page of the pair. */
- bp = (u_int16_t *)bufp->page;
- if (n > 2) {
- /* There is an overflow page. */
- bp[1] = pageno;
- bp[2] = OVFLPAGE;
- bufp->ovfl = rbufp->ovfl;
- } else
- /* This is the last page. */
- bufp->ovfl = NULL;
- n -= 2;
- bp[0] = n;
- FREESPACE(bp) = hashp->BSIZE - PAGE_META(n);
- OFFSET(bp) = hashp->BSIZE - 1;
-
- bufp->flags |= BUF_MOD;
- if (rbufp)
- __free_ovflpage(hashp, rbufp);
- if (last_bfp && last_bfp != rbufp)
- __free_ovflpage(hashp, last_bfp);
-
- hashp->NKEYS--;
- return (0);
-}
-/*
- * Returns:
- * 0 = key not found
- * -1 = get next overflow page
- * -2 means key not found and this is big key/data
- * -3 error
- */
-extern int
-__find_bigpair(hashp, bufp, ndx, key, size)
- HTAB *hashp;
- BUFHEAD *bufp;
- int ndx;
- char *key;
- int size;
-{
- register u_int16_t *bp;
- register char *p;
- int ksize;
- u_int16_t bytes;
- char *kkey;
-
- bp = (u_int16_t *)bufp->page;
- p = bufp->page;
- ksize = size;
- kkey = key;
-
- for (bytes = hashp->BSIZE - bp[ndx];
- bytes <= size && bp[ndx + 1] == PARTIAL_KEY;
- bytes = hashp->BSIZE - bp[ndx]) {
- if (memcmp(p + bp[ndx], kkey, bytes))
- return (-2);
- kkey += bytes;
- ksize -= bytes;
- bufp = __get_buf(hashp, bp[ndx + 2], bufp, 0);
- if (!bufp)
- return (-3);
- p = bufp->page;
- bp = (u_int16_t *)p;
- ndx = 1;
- }
-
- if (bytes != ksize || memcmp(p + bp[ndx], kkey, bytes)) {
-#ifdef HASH_STATISTICS
- ++hash_collisions;
-#endif
- return (-2);
- } else
- return (ndx);
-}
-
-/*
- * Given the buffer pointer of the first overflow page of a big pair,
- * find the end of the big pair
- *
- * This will set bpp to the buffer header of the last page of the big pair.
- * It will return the pageno of the overflow page following the last page
- * of the pair; 0 if there isn't any (i.e. big pair is the last key in the
- * bucket)
- */
-extern u_int16_t
-__find_last_page(hashp, bpp)
- HTAB *hashp;
- BUFHEAD **bpp;
-{
- BUFHEAD *bufp;
- u_int16_t *bp, pageno;
- int n;
-
- bufp = *bpp;
- bp = (u_int16_t *)bufp->page;
- for (;;) {
- n = bp[0];
-
- /*
- * This is the last page if: the tag is FULL_KEY_DATA and
- * either only 2 entries OVFLPAGE marker is explicit there
- * is freespace on the page.
- */
- if (bp[2] == FULL_KEY_DATA &&
- ((n == 2) || (bp[n] == OVFLPAGE) || (FREESPACE(bp))))
- break;
-
- pageno = bp[n - 1];
- bufp = __get_buf(hashp, pageno, bufp, 0);
- if (!bufp)
- return (0); /* Need to indicate an error! */
- bp = (u_int16_t *)bufp->page;
- }
-
- *bpp = bufp;
- if (bp[0] > 2)
- return (bp[3]);
- else
- return (0);
-}
-
-/*
- * Return the data for the key/data pair that begins on this page at this
- * index (index should always be 1).
- */
-extern int
-__big_return(hashp, bufp, ndx, val, set_current)
- HTAB *hashp;
- BUFHEAD *bufp;
- int ndx;
- DBT *val;
- int set_current;
-{
- BUFHEAD *save_p;
- u_int16_t *bp, len, off, save_addr;
- char *tp;
-
- bp = (u_int16_t *)bufp->page;
- while (bp[ndx + 1] == PARTIAL_KEY) {
- bufp = __get_buf(hashp, bp[bp[0] - 1], bufp, 0);
- if (!bufp)
- return (-1);
- bp = (u_int16_t *)bufp->page;
- ndx = 1;
- }
-
- if (bp[ndx + 1] == FULL_KEY) {
- bufp = __get_buf(hashp, bp[bp[0] - 1], bufp, 0);
- if (!bufp)
- return (-1);
- bp = (u_int16_t *)bufp->page;
- save_p = bufp;
- save_addr = save_p->addr;
- off = bp[1];
- len = 0;
- } else
- if (!FREESPACE(bp)) {
- /*
- * This is a hack. We can't distinguish between
- * FULL_KEY_DATA that contains complete data or
- * incomplete data, so we require that if the data
- * is complete, there is at least 1 byte of free
- * space left.
- */
- off = bp[bp[0]];
- len = bp[1] - off;
- save_p = bufp;
- save_addr = bufp->addr;
- bufp = __get_buf(hashp, bp[bp[0] - 1], bufp, 0);
- if (!bufp)
- return (-1);
- bp = (u_int16_t *)bufp->page;
- } else {
- /* The data is all on one page. */
- tp = (char *)bp;
- off = bp[bp[0]];
- val->data = (u_char *)tp + off;
- val->size = bp[1] - off;
- if (set_current) {
- if (bp[0] == 2) { /* No more buckets in
- * chain */
- hashp->cpage = NULL;
- hashp->cbucket++;
- hashp->cndx = 1;
- } else {
- hashp->cpage = __get_buf(hashp,
- bp[bp[0] - 1], bufp, 0);
- if (!hashp->cpage)
- return (-1);
- hashp->cndx = 1;
- if (!((u_int16_t *)
- hashp->cpage->page)[0]) {
- hashp->cbucket++;
- hashp->cpage = NULL;
- }
- }
- }
- return (0);
- }
-
- val->size = collect_data(hashp, bufp, (int)len, set_current);
- if (val->size == (size_t) -1)
- return (-1);
- if (save_p->addr != save_addr) {
- /* We are pretty short on buffers. */
- errno = EINVAL; /* OUT OF BUFFERS */
- return (-1);
- }
- memmove(hashp->tmp_buf, (save_p->page) + off, len);
- val->data = (u_char *)hashp->tmp_buf;
- return (0);
-}
-/*
- * Count how big the total datasize is by recursing through the pages. Then
- * allocate a buffer and copy the data as you recurse up.
- */
-static int
-collect_data(hashp, bufp, len, set)
- HTAB *hashp;
- BUFHEAD *bufp;
- int len, set;
-{
- register u_int16_t *bp;
- register char *p;
- BUFHEAD *xbp;
- u_int16_t save_addr;
- int mylen, totlen;
-
- p = bufp->page;
- bp = (u_int16_t *)p;
- mylen = hashp->BSIZE - bp[1];
- save_addr = bufp->addr;
-
- if (bp[2] == FULL_KEY_DATA) { /* End of Data */
- totlen = len + mylen;
- if (hashp->tmp_buf)
- free(hashp->tmp_buf);
- if ((hashp->tmp_buf = (char *)malloc(totlen)) == NULL)
- return (-1);
- if (set) {
- hashp->cndx = 1;
- if (bp[0] == 2) { /* No more buckets in chain */
- hashp->cpage = NULL;
- hashp->cbucket++;
- } else {
- hashp->cpage =
- __get_buf(hashp, bp[bp[0] - 1], bufp, 0);
- if (!hashp->cpage)
- return (-1);
- else if (!((u_int16_t *)hashp->cpage->page)[0]) {
- hashp->cbucket++;
- hashp->cpage = NULL;
- }
- }
- }
- } else {
- xbp = __get_buf(hashp, bp[bp[0] - 1], bufp, 0);
- if (!xbp || ((totlen =
- collect_data(hashp, xbp, len + mylen, set)) < 1))
- return (-1);
- }
- if (bufp->addr != save_addr) {
- errno = EINVAL; /* Out of buffers. */
- return (-1);
- }
- memmove(&hashp->tmp_buf[len], (bufp->page) + bp[1], mylen);
- return (totlen);
-}
-
-/*
- * Fill in the key and data for this big pair.
- */
-extern int
-__big_keydata(hashp, bufp, key, val, set)
- HTAB *hashp;
- BUFHEAD *bufp;
- DBT *key, *val;
- int set;
-{
- key->size = collect_key(hashp, bufp, 0, val, set);
- if (key->size == (size_t) -1)
- return (-1);
- key->data = (u_char *)hashp->tmp_key;
- return (0);
-}
-
-/*
- * Count how big the total key size is by recursing through the pages. Then
- * collect the data, allocate a buffer and copy the key as you recurse up.
- */
-static int
-collect_key(hashp, bufp, len, val, set)
- HTAB *hashp;
- BUFHEAD *bufp;
- int len;
- DBT *val;
- int set;
-{
- BUFHEAD *xbp;
- char *p;
- int mylen, totlen;
- u_int16_t *bp, save_addr;
-
- p = bufp->page;
- bp = (u_int16_t *)p;
- mylen = hashp->BSIZE - bp[1];
-
- save_addr = bufp->addr;
- totlen = len + mylen;
- if (bp[2] == FULL_KEY || bp[2] == FULL_KEY_DATA) { /* End of Key. */
- if (hashp->tmp_key != NULL)
- free(hashp->tmp_key);
- if ((hashp->tmp_key = (char *)malloc(totlen)) == NULL)
- return (-1);
- if (__big_return(hashp, bufp, 1, val, set))
- return (-1);
- } else {
- xbp = __get_buf(hashp, bp[bp[0] - 1], bufp, 0);
- if (!xbp || ((totlen =
- collect_key(hashp, xbp, totlen, val, set)) < 1))
- return (-1);
- }
- if (bufp->addr != save_addr) {
- errno = EINVAL; /* MIS -- OUT OF BUFFERS */
- return (-1);
- }
- memmove(&hashp->tmp_key[len], (bufp->page) + bp[1], mylen);
- return (totlen);
-}
-
-/*
- * Returns:
- * 0 => OK
- * -1 => error
- */
-extern int
-__big_split(hashp, op, np, big_keyp, addr, obucket, ret)
- HTAB *hashp;
- BUFHEAD *op; /* Pointer to where to put keys that go in old bucket */
- BUFHEAD *np; /* Pointer to new bucket page */
- /* Pointer to first page containing the big key/data */
- BUFHEAD *big_keyp;
- int addr; /* Address of big_keyp */
- u_int32_t obucket;/* Old Bucket */
- SPLIT_RETURN *ret;
-{
- register BUFHEAD *tmpp;
- register u_int16_t *tp;
- BUFHEAD *bp;
- DBT key, val;
- u_int32_t change;
- u_int16_t free_space, n, off;
-
- bp = big_keyp;
-
- /* Now figure out where the big key/data goes */
- if (__big_keydata(hashp, big_keyp, &key, &val, 0))
- return (-1);
- change = (__call_hash(hashp, key.data, key.size) != obucket);
-
- if ((ret->next_addr = __find_last_page(hashp, &big_keyp))) {
- if (!(ret->nextp =
- __get_buf(hashp, ret->next_addr, big_keyp, 0)))
- return (-1);;
- } else
- ret->nextp = NULL;
-
- /* Now make one of np/op point to the big key/data pair */
-#ifdef DEBUG
- assert(np->ovfl == NULL);
-#endif
- if (change)
- tmpp = np;
- else
- tmpp = op;
-
- tmpp->flags |= BUF_MOD;
-#ifdef DEBUG1
- (void)fprintf(stderr,
- "BIG_SPLIT: %d->ovfl was %d is now %d\n", tmpp->addr,
- (tmpp->ovfl ? tmpp->ovfl->addr : 0), (bp ? bp->addr : 0));
-#endif
- tmpp->ovfl = bp; /* one of op/np point to big_keyp */
- tp = (u_int16_t *)tmpp->page;
-#ifdef DEBUG
- assert(FREESPACE(tp) >= OVFLSIZE);
-#endif
- n = tp[0];
- off = OFFSET(tp);
- free_space = FREESPACE(tp);
- tp[++n] = (u_int16_t)addr;
- tp[++n] = OVFLPAGE;
- tp[0] = n;
- OFFSET(tp) = off;
- FREESPACE(tp) = free_space - OVFLSIZE;
-
- /*
- * Finally, set the new and old return values. BIG_KEYP contains a
- * pointer to the last page of the big key_data pair. Make sure that
- * big_keyp has no following page (2 elements) or create an empty
- * following page.
- */
-
- ret->newp = np;
- ret->oldp = op;
-
- tp = (u_int16_t *)big_keyp->page;
- big_keyp->flags |= BUF_MOD;
- if (tp[0] > 2) {
- /*
- * There may be either one or two offsets on this page. If
- * there is one, then the overflow page is linked on normally
- * and tp[4] is OVFLPAGE. If there are two, tp[4] contains
- * the second offset and needs to get stuffed in after the
- * next overflow page is added.
- */
- n = tp[4];
- free_space = FREESPACE(tp);
- off = OFFSET(tp);
- tp[0] -= 2;
- FREESPACE(tp) = free_space + OVFLSIZE;
- OFFSET(tp) = off;
- tmpp = __add_ovflpage(hashp, big_keyp);
- if (!tmpp)
- return (-1);
- tp[4] = n;
- } else
- tmpp = big_keyp;
-
- if (change)
- ret->newp = tmpp;
- else
- ret->oldp = tmpp;
- return (0);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Margo Seltzer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)hash_buf.c 8.5 (Berkeley) 7/15/94";
-#endif /* LIBC_SCCS and not lint */
-
-/*
- * PACKAGE: hash
- *
- * DESCRIPTION:
- * Contains buffer management
- *
- * ROUTINES:
- * External
- * __buf_init
- * __get_buf
- * __buf_free
- * __reclaim_buf
- * Internal
- * newbuf
- */
-
-#include <sys/param.h>
-
-#include <errno.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-#ifdef DEBUG
-#include <assert.h>
-#endif
-
-#include "../include/db.h"
-#include "hash.h"
-#include "page.h"
-#include "extern.h"
-
-static BUFHEAD *newbuf __P((HTAB *, u_int32_t, BUFHEAD *));
-
-/* Unlink B from its place in the lru */
-#define BUF_REMOVE(B) { \
- (B)->prev->next = (B)->next; \
- (B)->next->prev = (B)->prev; \
-}
-
-/* Insert B after P */
-#define BUF_INSERT(B, P) { \
- (B)->next = (P)->next; \
- (B)->prev = (P); \
- (P)->next = (B); \
- (B)->next->prev = (B); \
-}
-
-#define MRU hashp->bufhead.next
-#define LRU hashp->bufhead.prev
-
-#define MRU_INSERT(B) BUF_INSERT((B), &hashp->bufhead)
-#define LRU_INSERT(B) BUF_INSERT((B), LRU)
-
-/*
- * We are looking for a buffer with address "addr". If prev_bp is NULL, then
- * address is a bucket index. If prev_bp is not NULL, then it points to the
- * page previous to an overflow page that we are trying to find.
- *
- * CAVEAT: The buffer header accessed via prev_bp's ovfl field may no longer
- * be valid. Therefore, you must always verify that its address matches the
- * address you are seeking.
- */
-extern BUFHEAD *
-__get_buf(hashp, addr, prev_bp, newpage)
- HTAB *hashp;
- u_int32_t addr;
- BUFHEAD *prev_bp;
- int newpage; /* If prev_bp set, indicates a new overflow page. */
-{
- register BUFHEAD *bp;
- register u_int32_t is_disk_mask;
- register int is_disk, segment_ndx = 0;
- SEGMENT segp = 0;
-
- is_disk = 0;
- is_disk_mask = 0;
- if (prev_bp) {
- bp = prev_bp->ovfl;
- if (!bp || (bp->addr != addr))
- bp = NULL;
- if (!newpage)
- is_disk = BUF_DISK;
- } else {
- /* Grab buffer out of directory */
- segment_ndx = addr & (hashp->SGSIZE - 1);
-
- /* valid segment ensured by __call_hash() */
- segp = hashp->dir[addr >> hashp->SSHIFT];
-#ifdef DEBUG
- assert(segp != NULL);
-#endif
- bp = PTROF(segp[segment_ndx]);
- is_disk_mask = ISDISK(segp[segment_ndx]);
- is_disk = is_disk_mask || !hashp->new_file;
- }
-
- if (!bp) {
- bp = newbuf(hashp, addr, prev_bp);
- if (!bp ||
- __get_page(hashp, bp->page, addr, !prev_bp, is_disk, 0))
- return (NULL);
- if (!prev_bp)
- segp[segment_ndx] =
- (BUFHEAD *)((ptrdiff_t)bp | is_disk_mask);
- } else {
- BUF_REMOVE(bp);
- MRU_INSERT(bp);
- }
- return (bp);
-}
-
-/*
- * We need a buffer for this page. Either allocate one, or evict a resident
- * one (if we have as many buffers as we're allowed) and put this one in.
- *
- * If newbuf finds an error (returning NULL), it also sets errno.
- */
-static BUFHEAD *
-newbuf(hashp, addr, prev_bp)
- HTAB *hashp;
- u_int32_t addr;
- BUFHEAD *prev_bp;
-{
- register BUFHEAD *bp; /* The buffer we're going to use */
- register BUFHEAD *xbp; /* Temp pointer */
- register BUFHEAD *next_xbp;
- SEGMENT segp;
- int segment_ndx;
- u_int16_t oaddr, *shortp;
-
- oaddr = 0;
- bp = LRU;
- /*
- * If LRU buffer is pinned, the buffer pool is too small. We need to
- * allocate more buffers.
- */
- if (hashp->nbufs || (bp->flags & BUF_PIN)) {
- /* Allocate a new one */
- if ((bp = (BUFHEAD *)malloc(sizeof(BUFHEAD))) == NULL)
- return (NULL);
-#ifdef PURIFY
- memset(bp, 0xff, sizeof(BUFHEAD));
-#endif
- if ((bp->page = (char *)malloc(hashp->BSIZE)) == NULL) {
- free(bp);
- return (NULL);
- }
-#ifdef PURIFY
- memset(bp->page, 0xff, hashp->BSIZE);
-#endif
- if (hashp->nbufs)
- hashp->nbufs--;
- } else {
- /* Kick someone out */
- BUF_REMOVE(bp);
- /*
- * If this is an overflow page with addr 0, it's already been
- * flushed back in an overflow chain and initialized.
- */
- if ((bp->addr != 0) || (bp->flags & BUF_BUCKET)) {
- /*
- * Set oaddr before __put_page so that you get it
- * before bytes are swapped.
- */
- shortp = (u_int16_t *)bp->page;
- if (shortp[0])
- oaddr = shortp[shortp[0] - 1];
- if ((bp->flags & BUF_MOD) && __put_page(hashp, bp->page,
- bp->addr, (int)IS_BUCKET(bp->flags), 0))
- return (NULL);
- /*
- * Update the pointer to this page (i.e. invalidate it).
- *
- * If this is a new file (i.e. we created it at open
- * time), make sure that we mark pages which have been
- * written to disk so we retrieve them from disk later,
- * rather than allocating new pages.
- */
- if (IS_BUCKET(bp->flags)) {
- segment_ndx = bp->addr & (hashp->SGSIZE - 1);
- segp = hashp->dir[bp->addr >> hashp->SSHIFT];
-#ifdef DEBUG
- assert(segp != NULL);
-#endif
-
- if (hashp->new_file &&
- ((bp->flags & BUF_MOD) ||
- ISDISK(segp[segment_ndx])))
- segp[segment_ndx] = (BUFHEAD *)BUF_DISK;
- else
- segp[segment_ndx] = NULL;
- }
- /*
- * Since overflow pages can only be access by means of
- * their bucket, free overflow pages associated with
- * this bucket.
- */
- for (xbp = bp; xbp->ovfl;) {
- next_xbp = xbp->ovfl;
- xbp->ovfl = 0;
- xbp = next_xbp;
-
- /* Check that ovfl pointer is up date. */
- if (IS_BUCKET(xbp->flags) ||
- (oaddr != xbp->addr))
- break;
-
- shortp = (u_int16_t *)xbp->page;
- if (shortp[0])
- /* set before __put_page */
- oaddr = shortp[shortp[0] - 1];
- if ((xbp->flags & BUF_MOD) && __put_page(hashp,
- xbp->page, xbp->addr, 0, 0))
- return (NULL);
- xbp->addr = 0;
- xbp->flags = 0;
- BUF_REMOVE(xbp);
- LRU_INSERT(xbp);
- }
- }
- }
-
- /* Now assign this buffer */
- bp->addr = addr;
-#ifdef DEBUG1
- (void)fprintf(stderr, "NEWBUF1: %d->ovfl was %d is now %d\n",
- bp->addr, (bp->ovfl ? bp->ovfl->addr : 0), 0);
-#endif
- bp->ovfl = NULL;
- if (prev_bp) {
- /*
- * If prev_bp is set, this is an overflow page, hook it in to
- * the buffer overflow links.
- */
-#ifdef DEBUG1
- (void)fprintf(stderr, "NEWBUF2: %d->ovfl was %d is now %d\n",
- prev_bp->addr, (prev_bp->ovfl ? bp->ovfl->addr : 0),
- (bp ? bp->addr : 0));
-#endif
- prev_bp->ovfl = bp;
- bp->flags = 0;
- } else
- bp->flags = BUF_BUCKET;
- MRU_INSERT(bp);
- return (bp);
-}
-
-extern void
-__buf_init(hashp, nbytes)
- HTAB *hashp;
- int nbytes;
-{
- BUFHEAD *bfp;
- int npages;
-
- bfp = &(hashp->bufhead);
- npages = (nbytes + hashp->BSIZE - 1) >> hashp->BSHIFT;
- npages = MAX(npages, MIN_BUFFERS);
-
- hashp->nbufs = npages;
- bfp->next = bfp;
- bfp->prev = bfp;
- /*
- * This space is calloc'd so these are already null.
- *
- * bfp->ovfl = NULL;
- * bfp->flags = 0;
- * bfp->page = NULL;
- * bfp->addr = 0;
- */
-}
-
-extern int
-__buf_free(hashp, do_free, to_disk)
- HTAB *hashp;
- int do_free, to_disk;
-{
- BUFHEAD *bp;
-
- /* Need to make sure that buffer manager has been initialized */
- if (!LRU)
- return (0);
- for (bp = LRU; bp != &hashp->bufhead;) {
- /* Check that the buffer is valid */
- if (bp->addr || IS_BUCKET(bp->flags)) {
- if (to_disk && (bp->flags & BUF_MOD) &&
- __put_page(hashp, bp->page,
- bp->addr, IS_BUCKET(bp->flags), 0))
- return (-1);
- }
- /* Check if we are freeing stuff */
- if (do_free) {
- if (bp->page)
- free(bp->page);
- BUF_REMOVE(bp);
- free(bp);
- bp = LRU;
- } else
- bp = bp->prev;
- }
- return (0);
-}
-
-extern void
-__reclaim_buf(hashp, bp)
- HTAB *hashp;
- BUFHEAD *bp;
-{
- bp->ovfl = 0;
- bp->addr = 0;
- bp->flags = 0;
- BUF_REMOVE(bp);
- LRU_INSERT(bp);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Margo Seltzer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)hash_func.c 8.2 (Berkeley) 2/21/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include "../include/db.h"
-#include "hash.h"
-#include "page.h"
-#include "extern.h"
-
-/* only one of these can be defined */
-/* #define HASH1_EJB 1 */
-/* #define HASH2_PHONG 1 */
-/* #define HASH3_SDBM 1 */
-#define HASH4_TOREK 1
-
-static u_int32_t hashfunc __P((const void *, size_t));
-
-/* Global default hash function */
-u_int32_t (*__default_hash) __P((const void *, size_t)) = hashfunc;
-
-/*
- * HASH FUNCTIONS
- *
- * Assume that we've already split the bucket to which this key hashes,
- * calculate that bucket, and check that in fact we did already split it.
- *
- * This came from ejb's hsearch.
- */
-
-#ifdef HASH1_EJB
-
-#define PRIME1 37
-#define PRIME2 1048583
-
-static u_int32_t
-hashfunc(keyarg, len)
- const void *keyarg;
- register size_t len;
-{
- register const u_char *key;
- register u_int32_t h;
-
- /* Convert string to integer */
- for (key = keyarg, h = 0; len--;)
- h = h * PRIME1 ^ (*key++ - ' ');
- h %= PRIME2;
- return (h);
-}
-
-#endif
-
-#ifdef HASH2_PHONG
-/*
- * Phong's linear congruential hash
- */
-#define dcharhash(h, c) ((h) = 0x63c63cd9*(h) + 0x9c39c33d + (c))
-
-static u_int32_t
-hashfunc(keyarg, len)
- const void *keyarg;
- size_t len;
-{
- register const u_char *e, *key;
- register u_int32_t h;
- register u_char c;
-
- key = keyarg;
- e = key + len;
- for (h = 0; key != e;) {
- c = *key++;
- if (!c && key > e)
- break;
- dcharhash(h, c);
- }
- return (h);
-}
-#endif
-
-#ifdef HASH3_SDBM
-/*
- * This is INCREDIBLY ugly, but fast. We break the string up into 8 byte
- * units. On the first time through the loop we get the "leftover bytes"
- * (strlen % 8). On every other iteration, we perform 8 HASHC's so we handle
- * all 8 bytes. Essentially, this saves us 7 cmp & branch instructions. If
- * this routine is heavily used enough, it's worth the ugly coding.
- *
- * OZ's original sdbm hash
- */
-static u_int32_t
-hashfunc(keyarg, len)
- const void *keyarg;
- register size_t len;
-{
- register const u_char *key;
- register size_t loop;
- register u_int32_t h;
-
-#define HASHC h = *key++ + 65599 * h
-
- h = 0;
- key = keyarg;
- if (len > 0) {
- loop = (len + 8 - 1) >> 3;
-
- switch (len & (8 - 1)) {
- case 0:
- do {
- HASHC;
- /* FALLTHROUGH */
- case 7:
- HASHC;
- /* FALLTHROUGH */
- case 6:
- HASHC;
- /* FALLTHROUGH */
- case 5:
- HASHC;
- /* FALLTHROUGH */
- case 4:
- HASHC;
- /* FALLTHROUGH */
- case 3:
- HASHC;
- /* FALLTHROUGH */
- case 2:
- HASHC;
- /* FALLTHROUGH */
- case 1:
- HASHC;
- } while (--loop);
- }
- }
- return (h);
-}
-#endif
-
-#ifdef HASH4_TOREK
-/* Hash function from Chris Torek. */
-static u_int32_t
-hashfunc(keyarg, len)
- const void *keyarg;
- register size_t len;
-{
- register const u_char *key;
- register size_t loop;
- register u_int32_t h;
-
-#define HASH4a h = (h << 5) - h + *key++;
-#define HASH4b h = (h << 5) + h + *key++;
-#define HASH4 HASH4b
-
- h = 0;
- key = keyarg;
- if (len > 0) {
- loop = (len + 8 - 1) >> 3;
-
- switch (len & (8 - 1)) {
- case 0:
- do {
- HASH4;
- /* FALLTHROUGH */
- case 7:
- HASH4;
- /* FALLTHROUGH */
- case 6:
- HASH4;
- /* FALLTHROUGH */
- case 5:
- HASH4;
- /* FALLTHROUGH */
- case 4:
- HASH4;
- /* FALLTHROUGH */
- case 3:
- HASH4;
- /* FALLTHROUGH */
- case 2:
- HASH4;
- /* FALLTHROUGH */
- case 1:
- HASH4;
- } while (--loop);
- }
- }
- return (h);
-}
-#endif
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Margo Seltzer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)hash_log2.c 8.2 (Berkeley) 5/31/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include "../include/db.h"
-
-u_int32_t __hash_log2 __P((u_int32_t));
-
-u_int32_t
-__hash_log2(num)
- u_int32_t num;
-{
- register u_int32_t i, limit;
-
- limit = 1;
- for (i = 0; limit < num; limit = limit << 1, i++);
- return (i);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Margo Seltzer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)hash_page.c 8.7 (Berkeley) 8/16/94";
-#endif /* LIBC_SCCS and not lint */
-
-/*
- * PACKAGE: hashing
- *
- * DESCRIPTION:
- * Page manipulation for hashing package.
- *
- * ROUTINES:
- *
- * External
- * __get_page
- * __add_ovflpage
- * Internal
- * overflow_page
- * open_temp
- */
-
-#include <sys/types.h>
-
-#include <errno.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#ifdef DEBUG
-#include <assert.h>
-#endif
-
-#include "../include/db.h"
-#include "hash.h"
-#include "page.h"
-#include "extern.h"
-
-static u_int32_t *fetch_bitmap __P((HTAB *, int));
-static u_int32_t first_free __P((u_int32_t));
-static int open_temp __P((HTAB *));
-static u_int16_t overflow_page __P((HTAB *));
-static void putpair __P((char *, const DBT *, const DBT *));
-static void squeeze_key __P((u_int16_t *, const DBT *, const DBT *));
-static int ugly_split
- __P((HTAB *, u_int32_t, BUFHEAD *, BUFHEAD *, int, int));
-
-#define PAGE_INIT(P) { \
- ((u_int16_t *)(P))[0] = 0; \
- ((u_int16_t *)(P))[1] = hashp->BSIZE - 3 * sizeof(u_int16_t); \
- ((u_int16_t *)(P))[2] = hashp->BSIZE; \
-}
-
-/*
- * This is called AFTER we have verified that there is room on the page for
- * the pair (PAIRFITS has returned true) so we go right ahead and start moving
- * stuff on.
- */
-static void
-putpair(p, key, val)
- char *p;
- const DBT *key, *val;
-{
- register u_int16_t *bp, n, off;
-
- bp = (u_int16_t *)p;
-
- /* Enter the key first. */
- n = bp[0];
-
- off = OFFSET(bp) - key->size;
- memmove(p + off, key->data, key->size);
- bp[++n] = off;
-
- /* Now the data. */
- off -= val->size;
- memmove(p + off, val->data, val->size);
- bp[++n] = off;
-
- /* Adjust page info. */
- bp[0] = n;
- bp[n + 1] = off - ((n + 3) * sizeof(u_int16_t));
- bp[n + 2] = off;
-}
-
-/*
- * Returns:
- * 0 OK
- * -1 error
- */
-extern int
-__delpair(hashp, bufp, ndx)
- HTAB *hashp;
- BUFHEAD *bufp;
- register int ndx;
-{
- register u_int16_t *bp, newoff;
- register int n;
- u_int16_t pairlen;
-
- bp = (u_int16_t *)bufp->page;
- n = bp[0];
-
- if (bp[ndx + 1] < REAL_KEY)
- return (__big_delete(hashp, bufp));
- if (ndx != 1)
- newoff = bp[ndx - 1];
- else
- newoff = hashp->BSIZE;
- pairlen = newoff - bp[ndx + 1];
-
- if (ndx != (n - 1)) {
- /* Hard Case -- need to shuffle keys */
- register int i;
- register char *src = bufp->page + (int)OFFSET(bp);
- register char *dst = src + (int)pairlen;
- memmove(dst, src, bp[ndx + 1] - OFFSET(bp));
-
- /* Now adjust the pointers */
- for (i = ndx + 2; i <= n; i += 2) {
- if (bp[i + 1] == OVFLPAGE) {
- bp[i - 2] = bp[i];
- bp[i - 1] = bp[i + 1];
- } else {
- bp[i - 2] = bp[i] + pairlen;
- bp[i - 1] = bp[i + 1] + pairlen;
- }
- }
- }
- /* Finally adjust the page data */
- bp[n] = OFFSET(bp) + pairlen;
- bp[n - 1] = bp[n + 1] + pairlen + 2 * sizeof(u_int16_t);
- bp[0] = n - 2;
- hashp->NKEYS--;
-
- bufp->flags |= BUF_MOD;
- return (0);
-}
-/*
- * Returns:
- * 0 ==> OK
- * -1 ==> Error
- */
-extern int
-__split_page(hashp, obucket, nbucket)
- HTAB *hashp;
- u_int32_t obucket, nbucket;
-{
- register BUFHEAD *new_bufp, *old_bufp;
- register u_int16_t *ino;
- register char *np;
- DBT key, val;
- int n, ndx, retval;
- u_int16_t copyto, diff, off, moved;
- char *op;
-
- copyto = (u_int16_t)hashp->BSIZE;
- off = (u_int16_t)hashp->BSIZE;
- old_bufp = __get_buf(hashp, obucket, NULL, 0);
- if (old_bufp == NULL)
- return (-1);
- new_bufp = __get_buf(hashp, nbucket, NULL, 0);
- if (new_bufp == NULL)
- return (-1);
-
- old_bufp->flags |= (BUF_MOD | BUF_PIN);
- new_bufp->flags |= (BUF_MOD | BUF_PIN);
-
- ino = (u_int16_t *)(op = old_bufp->page);
- np = new_bufp->page;
-
- moved = 0;
-
- for (n = 1, ndx = 1; n < ino[0]; n += 2) {
- if (ino[n + 1] < REAL_KEY) {
- retval = ugly_split(hashp, obucket, old_bufp, new_bufp,
- (int)copyto, (int)moved);
- old_bufp->flags &= ~BUF_PIN;
- new_bufp->flags &= ~BUF_PIN;
- return (retval);
-
- }
- key.data = (u_char *)op + ino[n];
- key.size = off - ino[n];
-
- if (__call_hash(hashp, key.data, key.size) == obucket) {
- /* Don't switch page */
- diff = copyto - off;
- if (diff) {
- copyto = ino[n + 1] + diff;
- memmove(op + copyto, op + ino[n + 1],
- off - ino[n + 1]);
- ino[ndx] = copyto + ino[n] - ino[n + 1];
- ino[ndx + 1] = copyto;
- } else
- copyto = ino[n + 1];
- ndx += 2;
- } else {
- /* Switch page */
- val.data = (u_char *)op + ino[n + 1];
- val.size = ino[n] - ino[n + 1];
- putpair(np, &key, &val);
- moved += 2;
- }
-
- off = ino[n + 1];
- }
-
- /* Now clean up the page */
- ino[0] -= moved;
- FREESPACE(ino) = copyto - sizeof(u_int16_t) * (ino[0] + 3);
- OFFSET(ino) = copyto;
-
-#ifdef DEBUG3
- (void)fprintf(stderr, "split %d/%d\n",
- ((u_int16_t *)np)[0] / 2,
- ((u_int16_t *)op)[0] / 2);
-#endif
- /* unpin both pages */
- old_bufp->flags &= ~BUF_PIN;
- new_bufp->flags &= ~BUF_PIN;
- return (0);
-}
-
-/*
- * Called when we encounter an overflow or big key/data page during split
- * handling. This is special cased since we have to begin checking whether
- * the key/data pairs fit on their respective pages and because we may need
- * overflow pages for both the old and new pages.
- *
- * The first page might be a page with regular key/data pairs in which case
- * we have a regular overflow condition and just need to go on to the next
- * page or it might be a big key/data pair in which case we need to fix the
- * big key/data pair.
- *
- * Returns:
- * 0 ==> success
- * -1 ==> failure
- */
-static int
-ugly_split(hashp, obucket, old_bufp, new_bufp, copyto, moved)
- HTAB *hashp;
- u_int32_t obucket; /* Same as __split_page. */
- BUFHEAD *old_bufp, *new_bufp;
- int copyto; /* First byte on page which contains key/data values. */
- int moved; /* Number of pairs moved to new page. */
-{
- register BUFHEAD *bufp; /* Buffer header for ino */
- register u_int16_t *ino; /* Page keys come off of */
- register u_int16_t *np; /* New page */
- register u_int16_t *op; /* Page keys go on to if they aren't moving */
-
- BUFHEAD *last_bfp; /* Last buf header OVFL needing to be freed */
- DBT key, val;
- SPLIT_RETURN ret;
- u_int16_t n, off, ov_addr, scopyto;
- char *cino; /* Character value of ino */
-
- bufp = old_bufp;
- ino = (u_int16_t *)old_bufp->page;
- np = (u_int16_t *)new_bufp->page;
- op = (u_int16_t *)old_bufp->page;
- last_bfp = NULL;
- scopyto = (u_int16_t)copyto; /* ANSI */
-
- n = ino[0] - 1;
- while (n < ino[0]) {
- if (ino[2] < REAL_KEY && ino[2] != OVFLPAGE) {
- if (__big_split(hashp, old_bufp,
- new_bufp, bufp, bufp->addr, obucket, &ret))
- return (-1);
- old_bufp = ret.oldp;
- if (!old_bufp)
- return (-1);
- op = (u_int16_t *)old_bufp->page;
- new_bufp = ret.newp;
- if (!new_bufp)
- return (-1);
- np = (u_int16_t *)new_bufp->page;
- bufp = ret.nextp;
- if (!bufp)
- return (0);
- cino = (char *)bufp->page;
- ino = (u_int16_t *)cino;
- last_bfp = ret.nextp;
- } else if (ino[n + 1] == OVFLPAGE) {
- ov_addr = ino[n];
- /*
- * Fix up the old page -- the extra 2 are the fields
- * which contained the overflow information.
- */
- ino[0] -= (moved + 2);
- FREESPACE(ino) =
- scopyto - sizeof(u_int16_t) * (ino[0] + 3);
- OFFSET(ino) = scopyto;
-
- bufp = __get_buf(hashp, ov_addr, bufp, 0);
- if (!bufp)
- return (-1);
-
- ino = (u_int16_t *)bufp->page;
- n = 1;
- scopyto = hashp->BSIZE;
- moved = 0;
-
- if (last_bfp)
- __free_ovflpage(hashp, last_bfp);
- last_bfp = bufp;
- }
- /* Move regular sized pairs of there are any */
- off = hashp->BSIZE;
- for (n = 1; (n < ino[0]) && (ino[n + 1] >= REAL_KEY); n += 2) {
- cino = (char *)ino;
- key.data = (u_char *)cino + ino[n];
- key.size = off - ino[n];
- val.data = (u_char *)cino + ino[n + 1];
- val.size = ino[n] - ino[n + 1];
- off = ino[n + 1];
-
- if (__call_hash(hashp, key.data, key.size) == obucket) {
- /* Keep on old page */
- if (PAIRFITS(op, (&key), (&val)))
- putpair((char *)op, &key, &val);
- else {
- old_bufp =
- __add_ovflpage(hashp, old_bufp);
- if (!old_bufp)
- return (-1);
- op = (u_int16_t *)old_bufp->page;
- putpair((char *)op, &key, &val);
- }
- old_bufp->flags |= BUF_MOD;
- } else {
- /* Move to new page */
- if (PAIRFITS(np, (&key), (&val)))
- putpair((char *)np, &key, &val);
- else {
- new_bufp =
- __add_ovflpage(hashp, new_bufp);
- if (!new_bufp)
- return (-1);
- np = (u_int16_t *)new_bufp->page;
- putpair((char *)np, &key, &val);
- }
- new_bufp->flags |= BUF_MOD;
- }
- }
- }
- if (last_bfp)
- __free_ovflpage(hashp, last_bfp);
- return (0);
-}
-
-/*
- * Add the given pair to the page
- *
- * Returns:
- * 0 ==> OK
- * 1 ==> failure
- */
-extern int
-__addel(hashp, bufp, key, val)
- HTAB *hashp;
- BUFHEAD *bufp;
- const DBT *key, *val;
-{
- register u_int16_t *bp, *sop;
- int do_expand;
-
- bp = (u_int16_t *)bufp->page;
- do_expand = 0;
- while (bp[0] && (bp[2] < REAL_KEY || bp[bp[0]] < REAL_KEY))
- /* Exception case */
- if (bp[2] == FULL_KEY_DATA && bp[0] == 2)
- /* This is the last page of a big key/data pair
- and we need to add another page */
- break;
- else if (bp[2] < REAL_KEY && bp[bp[0]] != OVFLPAGE) {
- bufp = __get_buf(hashp, bp[bp[0] - 1], bufp, 0);
- if (!bufp)
- return (-1);
- bp = (u_int16_t *)bufp->page;
- } else
- /* Try to squeeze key on this page */
- if (FREESPACE(bp) > PAIRSIZE(key, val)) {
- squeeze_key(bp, key, val);
- return (0);
- } else {
- bufp = __get_buf(hashp, bp[bp[0] - 1], bufp, 0);
- if (!bufp)
- return (-1);
- bp = (u_int16_t *)bufp->page;
- }
-
- if (PAIRFITS(bp, key, val))
- putpair(bufp->page, key, val);
- else {
- do_expand = 1;
- bufp = __add_ovflpage(hashp, bufp);
- if (!bufp)
- return (-1);
- sop = (u_int16_t *)bufp->page;
-
- if (PAIRFITS(sop, key, val))
- putpair((char *)sop, key, val);
- else
- if (__big_insert(hashp, bufp, key, val))
- return (-1);
- }
- bufp->flags |= BUF_MOD;
- /*
- * If the average number of keys per bucket exceeds the fill factor,
- * expand the table.
- */
- hashp->NKEYS++;
- if (do_expand ||
- (hashp->NKEYS / (hashp->MAX_BUCKET + 1) > hashp->FFACTOR))
- return (__expand_table(hashp));
- return (0);
-}
-
-/*
- *
- * Returns:
- * pointer on success
- * NULL on error
- */
-extern BUFHEAD *
-__add_ovflpage(hashp, bufp)
- HTAB *hashp;
- BUFHEAD *bufp;
-{
- register u_int16_t *sp;
- u_int16_t ndx, ovfl_num;
-#ifdef DEBUG1
- int tmp1, tmp2;
-#endif
- sp = (u_int16_t *)bufp->page;
-
- /* Check if we are dynamically determining the fill factor */
- if (hashp->FFACTOR == DEF_FFACTOR) {
- hashp->FFACTOR = sp[0] >> 1;
- if (hashp->FFACTOR < MIN_FFACTOR)
- hashp->FFACTOR = MIN_FFACTOR;
- }
- bufp->flags |= BUF_MOD;
- ovfl_num = overflow_page(hashp);
-#ifdef DEBUG1
- tmp1 = bufp->addr;
- tmp2 = bufp->ovfl ? bufp->ovfl->addr : 0;
-#endif
- if (!ovfl_num || !(bufp->ovfl = __get_buf(hashp, ovfl_num, bufp, 1)))
- return (NULL);
- bufp->ovfl->flags |= BUF_MOD;
-#ifdef DEBUG1
- (void)fprintf(stderr, "ADDOVFLPAGE: %d->ovfl was %d is now %d\n",
- tmp1, tmp2, bufp->ovfl->addr);
-#endif
- ndx = sp[0];
- /*
- * Since a pair is allocated on a page only if there's room to add
- * an overflow page, we know that the OVFL information will fit on
- * the page.
- */
- sp[ndx + 4] = OFFSET(sp);
- sp[ndx + 3] = FREESPACE(sp) - OVFLSIZE;
- sp[ndx + 1] = ovfl_num;
- sp[ndx + 2] = OVFLPAGE;
- sp[0] = ndx + 2;
-#ifdef HASH_STATISTICS
- hash_overflows++;
-#endif
- return (bufp->ovfl);
-}
-
-/*
- * Returns:
- * 0 indicates SUCCESS
- * -1 indicates FAILURE
- */
-extern int
-__get_page(hashp, p, bucket, is_bucket, is_disk, is_bitmap)
- HTAB *hashp;
- char *p;
- u_int32_t bucket;
- int is_bucket, is_disk, is_bitmap;
-{
- register int fd, page, size;
- int rsize;
- u_int16_t *bp;
-
- fd = hashp->fp;
- size = hashp->BSIZE;
-
- if ((fd == -1) || !is_disk) {
- PAGE_INIT(p);
- return (0);
- }
- if (is_bucket)
- page = BUCKET_TO_PAGE(bucket);
- else
- page = OADDR_TO_PAGE(bucket);
- if ((lseek(fd, (off_t)page << hashp->BSHIFT, SEEK_SET) == -1) ||
- ((rsize = read(fd, p, size)) == -1))
- return (-1);
- bp = (u_int16_t *)p;
- if (!rsize)
- bp[0] = 0; /* We hit the EOF, so initialize a new page */
- else
- if (rsize != size) {
- errno = EFTYPE;
- return (-1);
- }
- if (!is_bitmap && !bp[0]) {
- PAGE_INIT(p);
- } else
- if (hashp->LORDER != BYTE_ORDER) {
- register int i, max;
-
- if (is_bitmap) {
- max = hashp->BSIZE >> 2; /* divide by 4 */
- for (i = 0; i < max; i++)
- M_32_SWAP(((int *)p)[i]);
- } else {
- M_16_SWAP(bp[0]);
- max = bp[0] + 2;
- for (i = 1; i <= max; i++)
- M_16_SWAP(bp[i]);
- }
- }
- return (0);
-}
-
-/*
- * Write page p to disk
- *
- * Returns:
- * 0 ==> OK
- * -1 ==>failure
- */
-extern int
-__put_page(hashp, p, bucket, is_bucket, is_bitmap)
- HTAB *hashp;
- char *p;
- u_int32_t bucket;
- int is_bucket, is_bitmap;
-{
- register int fd, page, size;
- int wsize;
-
- size = hashp->BSIZE;
- if ((hashp->fp == -1) && open_temp(hashp))
- return (-1);
- fd = hashp->fp;
-
- if (hashp->LORDER != BYTE_ORDER) {
- register int i;
- register int max;
-
- if (is_bitmap) {
- max = hashp->BSIZE >> 2; /* divide by 4 */
- for (i = 0; i < max; i++)
- M_32_SWAP(((int *)p)[i]);
- } else {
- max = ((u_int16_t *)p)[0] + 2;
- for (i = 0; i <= max; i++)
- M_16_SWAP(((u_int16_t *)p)[i]);
- }
- }
- if (is_bucket)
- page = BUCKET_TO_PAGE(bucket);
- else
- page = OADDR_TO_PAGE(bucket);
- if ((lseek(fd, (off_t)page << hashp->BSHIFT, SEEK_SET) == -1) ||
- ((wsize = write(fd, p, size)) == -1))
- /* Errno is set */
- return (-1);
- if (wsize != size) {
- errno = EFTYPE;
- return (-1);
- }
- return (0);
-}
-
-#define BYTE_MASK ((1 << INT_BYTE_SHIFT) -1)
-/*
- * Initialize a new bitmap page. Bitmap pages are left in memory
- * once they are read in.
- */
-extern int
-__ibitmap(hashp, pnum, nbits, ndx)
- HTAB *hashp;
- int pnum, nbits, ndx;
-{
- u_int32_t *ip;
- int clearbytes, clearints;
-
- if ((ip = (u_int32_t *)malloc(hashp->BSIZE)) == NULL)
- return (1);
- hashp->nmaps++;
- clearints = ((nbits - 1) >> INT_BYTE_SHIFT) + 1;
- clearbytes = clearints << INT_TO_BYTE;
- (void)memset((char *)ip, 0, clearbytes);
- (void)memset(((char *)ip) + clearbytes, 0xFF,
- hashp->BSIZE - clearbytes);
- ip[clearints - 1] = ALL_SET << (nbits & BYTE_MASK);
- SETBIT(ip, 0);
- hashp->BITMAPS[ndx] = (u_int16_t)pnum;
- hashp->mapp[ndx] = ip;
- return (0);
-}
-
-static u_int32_t
-first_free(map)
- u_int32_t map;
-{
- register u_int32_t i, mask;
-
- mask = 0x1;
- for (i = 0; i < BITS_PER_MAP; i++) {
- if (!(mask & map))
- return (i);
- mask = mask << 1;
- }
- return (i);
-}
-
-static u_int16_t
-overflow_page(hashp)
- HTAB *hashp;
-{
- register u_int32_t *freep = 0;
- register int max_free, offset, splitnum;
- u_int16_t addr;
- int bit, first_page, free_bit, free_page, i, in_use_bits, j;
-#ifdef DEBUG2
- int tmp1, tmp2;
-#endif
- splitnum = hashp->OVFL_POINT;
- max_free = hashp->SPARES[splitnum];
-
- free_page = (max_free - 1) >> (hashp->BSHIFT + BYTE_SHIFT);
- free_bit = (max_free - 1) & ((hashp->BSIZE << BYTE_SHIFT) - 1);
-
- /* Look through all the free maps to find the first free block */
- first_page = hashp->LAST_FREED >>(hashp->BSHIFT + BYTE_SHIFT);
- for ( i = first_page; i <= free_page; i++ ) {
- if (!(freep = (u_int32_t *)hashp->mapp[i]) &&
- !(freep = fetch_bitmap(hashp, i)))
- return (0);
- if (i == free_page)
- in_use_bits = free_bit;
- else
- in_use_bits = (hashp->BSIZE << BYTE_SHIFT) - 1;
-
- if (i == first_page) {
- bit = hashp->LAST_FREED &
- ((hashp->BSIZE << BYTE_SHIFT) - 1);
- j = bit / BITS_PER_MAP;
- bit = bit & ~(BITS_PER_MAP - 1);
- } else {
- bit = 0;
- j = 0;
- }
- for (; bit <= in_use_bits; j++, bit += BITS_PER_MAP)
- if (freep[j] != ALL_SET)
- goto found;
- }
-
- /* No Free Page Found */
- hashp->LAST_FREED = hashp->SPARES[splitnum];
- hashp->SPARES[splitnum]++;
- offset = hashp->SPARES[splitnum] -
- (splitnum ? hashp->SPARES[splitnum - 1] : 0);
-
-#define OVMSG "HASH: Out of overflow pages. Increase page size\n"
- if (offset > SPLITMASK) {
- if (++splitnum >= NCACHED) {
- if (write(STDERR_FILENO, OVMSG, sizeof(OVMSG) - 1) < 0) {
- }
- return (0);
- }
- hashp->OVFL_POINT = splitnum;
- hashp->SPARES[splitnum] = hashp->SPARES[splitnum-1];
- hashp->SPARES[splitnum-1]--;
- offset = 1;
- }
-
- /* Check if we need to allocate a new bitmap page */
- if (free_bit == (hashp->BSIZE << BYTE_SHIFT) - 1) {
- free_page++;
- if (free_page >= NCACHED) {
- if (write(STDERR_FILENO, OVMSG, sizeof(OVMSG) - 1) < 0) {
- }
- return (0);
- }
- /*
- * This is tricky. The 1 indicates that you want the new page
- * allocated with 1 clear bit. Actually, you are going to
- * allocate 2 pages from this map. The first is going to be
- * the map page, the second is the overflow page we were
- * looking for. The init_bitmap routine automatically, sets
- * the first bit of itself to indicate that the bitmap itself
- * is in use. We would explicitly set the second bit, but
- * don't have to if we tell init_bitmap not to leave it clear
- * in the first place.
- */
- if (__ibitmap(hashp,
- (int)OADDR_OF(splitnum, offset), 1, free_page))
- return (0);
- hashp->SPARES[splitnum]++;
-#ifdef DEBUG2
- free_bit = 2;
-#endif
- offset++;
- if (offset > SPLITMASK) {
- if (++splitnum >= NCACHED) {
- if (write(STDERR_FILENO, OVMSG, sizeof(OVMSG) - 1) < 0) {
- }
- return (0);
- }
- hashp->OVFL_POINT = splitnum;
- hashp->SPARES[splitnum] = hashp->SPARES[splitnum-1];
- hashp->SPARES[splitnum-1]--;
- offset = 0;
- }
- } else {
- /*
- * Free_bit addresses the last used bit. Bump it to address
- * the first available bit.
- */
- free_bit++;
- SETBIT(freep, free_bit);
- }
-
- /* Calculate address of the new overflow page */
- addr = OADDR_OF(splitnum, offset);
-#ifdef DEBUG2
- (void)fprintf(stderr, "OVERFLOW_PAGE: ADDR: %d BIT: %d PAGE %d\n",
- addr, free_bit, free_page);
-#endif
- return (addr);
-
-found:
- bit = bit + first_free(freep[j]);
- SETBIT(freep, bit);
-#ifdef DEBUG2
- tmp1 = bit;
- tmp2 = i;
-#endif
- /*
- * Bits are addressed starting with 0, but overflow pages are addressed
- * beginning at 1. Bit is a bit addressnumber, so we need to increment
- * it to convert it to a page number.
- */
- bit = 1 + bit + (i * (hashp->BSIZE << BYTE_SHIFT));
- if (bit >= hashp->LAST_FREED)
- hashp->LAST_FREED = bit - 1;
-
- /* Calculate the split number for this page */
- for (i = 0; (i < splitnum) && (bit > hashp->SPARES[i]); i++);
- offset = (i ? bit - hashp->SPARES[i - 1] : bit);
- if (offset >= SPLITMASK)
- return (0); /* Out of overflow pages */
- addr = OADDR_OF(i, offset);
-#ifdef DEBUG2
- (void)fprintf(stderr, "OVERFLOW_PAGE: ADDR: %d BIT: %d PAGE %d\n",
- addr, tmp1, tmp2);
-#endif
-
- /* Allocate and return the overflow page */
- return (addr);
-}
-
-/*
- * Mark this overflow page as free.
- */
-extern void
-__free_ovflpage(hashp, obufp)
- HTAB *hashp;
- BUFHEAD *obufp;
-{
- register u_int16_t addr;
- u_int32_t *freep;
- int bit_address, free_page, free_bit;
- u_int16_t ndx;
-
- addr = obufp->addr;
-#ifdef DEBUG1
- (void)fprintf(stderr, "Freeing %d\n", addr);
-#endif
- ndx = (((u_int16_t)addr) >> SPLITSHIFT);
- bit_address =
- (ndx ? hashp->SPARES[ndx - 1] : 0) + (addr & SPLITMASK) - 1;
- if (bit_address < hashp->LAST_FREED)
- hashp->LAST_FREED = bit_address;
- free_page = (bit_address >> (hashp->BSHIFT + BYTE_SHIFT));
- free_bit = bit_address & ((hashp->BSIZE << BYTE_SHIFT) - 1);
-
- if (!(freep = hashp->mapp[free_page]))
- freep = fetch_bitmap(hashp, free_page);
-#ifdef DEBUG
- /*
- * This had better never happen. It means we tried to read a bitmap
- * that has already had overflow pages allocated off it, and we
- * failed to read it from the file.
- */
- if (!freep)
- assert(0);
-#endif
- CLRBIT(freep, free_bit);
-#ifdef DEBUG2
- (void)fprintf(stderr, "FREE_OVFLPAGE: ADDR: %d BIT: %d PAGE %d\n",
- obufp->addr, free_bit, free_page);
-#endif
- __reclaim_buf(hashp, obufp);
-}
-
-/*
- * Returns:
- * 0 success
- * -1 failure
- */
-static int
-open_temp(hashp)
- HTAB *hashp;
-{
- sigset_t set, oset;
- static char namestr[] = "_hashXXXXXX";
-
- /* Block signals; make sure file goes away at process exit. */
- (void)sigfillset(&set);
- (void)sigprocmask(SIG_BLOCK, &set, &oset);
- if ((hashp->fp = mkstemp(namestr)) != -1) {
- (void)unlink(namestr);
- (void)fcntl(hashp->fp, F_SETFD, 1);
- }
- (void)sigprocmask(SIG_SETMASK, &oset, (sigset_t *)NULL);
- return (hashp->fp != -1 ? 0 : -1);
-}
-
-/*
- * We have to know that the key will fit, but the last entry on the page is
- * an overflow pair, so we need to shift things.
- */
-static void
-squeeze_key(sp, key, val)
- u_int16_t *sp;
- const DBT *key, *val;
-{
- register char *p;
- u_int16_t free_space, n, off, pageno;
-
- p = (char *)sp;
- n = sp[0];
- free_space = FREESPACE(sp);
- off = OFFSET(sp);
-
- pageno = sp[n - 1];
- off -= key->size;
- sp[n - 1] = off;
- memmove(p + off, key->data, key->size);
- off -= val->size;
- sp[n] = off;
- memmove(p + off, val->data, val->size);
- sp[0] = n + 2;
- sp[n + 1] = pageno;
- sp[n + 2] = OVFLPAGE;
- FREESPACE(sp) = free_space - PAIRSIZE(key, val);
- OFFSET(sp) = off;
-}
-
-static u_int32_t *
-fetch_bitmap(hashp, ndx)
- HTAB *hashp;
- int ndx;
-{
- if (ndx >= hashp->nmaps)
- return (NULL);
- if ((hashp->mapp[ndx] = (u_int32_t *)malloc(hashp->BSIZE)) == NULL)
- return (NULL);
- if (__get_page(hashp,
- (char *)hashp->mapp[ndx], hashp->BITMAPS[ndx], 0, 1, 1)) {
- free(hashp->mapp[ndx]);
- return (NULL);
- }
- return (hashp->mapp[ndx]);
-}
-
-#ifdef DEBUG4
-int
-print_chain(addr)
- int addr;
-{
- BUFHEAD *bufp;
- short *bp, oaddr;
-
- (void)fprintf(stderr, "%d ", addr);
- bufp = __get_buf(hashp, addr, NULL, 0);
- bp = (short *)bufp->page;
- while (bp[0] && ((bp[bp[0]] == OVFLPAGE) ||
- ((bp[0] > 2) && bp[2] < REAL_KEY))) {
- oaddr = bp[bp[0] - 1];
- (void)fprintf(stderr, "%d ", (int)oaddr);
- bufp = __get_buf(hashp, (int)oaddr, bufp, 0);
- bp = (short *)bufp->page;
- }
- (void)fprintf(stderr, "\n");
-}
-#endif
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Margo Seltzer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)hsearch.c 8.4 (Berkeley) 7/21/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <fcntl.h>
-#include <string.h>
-
-#include "../include/db.h"
-#include "search.h"
-
-static DB *dbp = NULL;
-static ENTRY retval;
-
-extern int
-hcreate(nel)
- u_int nel;
-{
- HASHINFO info;
-
- info.nelem = nel;
- info.bsize = 256;
- info.ffactor = 8;
- info.cachesize = 0;
- info.hash = NULL;
- info.lorder = 0;
- dbp = (DB *)__hash_open(NULL, O_CREAT | O_RDWR, 0600, &info, 0);
- return ((int)dbp);
-}
-
-extern ENTRY *
-hsearch(item, action)
- ENTRY item;
- ACTION action;
-{
- DBT key, val;
- int status;
-
- if (!dbp)
- return (NULL);
- key.data = (u_char *)item.key;
- key.size = strlen(item.key) + 1;
-
- if (action == ENTER) {
- val.data = (u_char *)item.data;
- val.size = strlen(item.data) + 1;
- status = (dbp->put)(dbp, &key, &val, R_NOOVERWRITE);
- if (status)
- return (NULL);
- } else {
- /* FIND */
- status = (dbp->get)(dbp, &key, &val, 0);
- if (status)
- return (NULL);
- else
- item.data = (char *)val.data;
- }
- retval.key = item.key;
- retval.data = item.data;
- return (&retval);
-}
-
-extern void
-hdestroy()
-{
- if (dbp) {
- (void)(dbp->close)(dbp);
- dbp = NULL;
- }
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Margo Seltzer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)ndbm.c 8.4 (Berkeley) 7/21/94";
-#endif /* LIBC_SCCS and not lint */
-
-/*
- * This package provides a dbm compatible interface to the new hashing
- * package described in db(3).
- */
-
-#include <sys/param.h>
-
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-
-#include <ndbm.h>
-#include "hash.h"
-
-/*
- * Returns:
- * *DBM on success
- * NULL on failure
- */
-extern DBM *
-dbm_open(file, flags, mode)
- const char *file;
- int flags, mode;
-{
- DBM *db;
- HASHINFO info;
- const size_t len = strlen(file) + sizeof (DBM_SUFFIX);
-#ifdef __GNUC__
- char path[len];
-#else
- char *path = malloc(len);
- if (path == NULL)
- return NULL;
-#endif
-
- info.bsize = 4096;
- info.ffactor = 40;
- info.nelem = 1;
- info.cachesize = 0;
- info.hash = NULL;
- info.lorder = 0;
- snprintf(path, len, "%s%s", file, DBM_SUFFIX);
- db = (DBM *)__hash_open(path, flags, mode, &info, 0);
-#ifndef __GNUC__
- free(path);
-#endif
- return db;
-}
-
-extern void
-dbm_close(db)
- DBM *db;
-{
- (void)(db->close)(db);
-}
-
-/*
- * Returns:
- * DATUM on success
- * NULL on failure
- */
-extern datum
-dbm_fetch(db, key)
- DBM *db;
- datum key;
-{
- datum retdata;
- int status;
- DBT dbtkey, dbtretdata;
-
- dbtkey.data = key.dptr;
- dbtkey.size = key.dsize;
- status = (db->get)(db, &dbtkey, &dbtretdata, 0);
- if (status) {
- dbtretdata.data = NULL;
- dbtretdata.size = 0;
- }
- retdata.dptr = dbtretdata.data;
- retdata.dsize = dbtretdata.size;
- return (retdata);
-}
-
-/*
- * Returns:
- * DATUM on success
- * NULL on failure
- */
-extern datum
-dbm_firstkey(db)
- DBM *db;
-{
- int status;
- datum retkey;
- DBT dbtretkey, dbtretdata;
-
- status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST);
- if (status)
- dbtretkey.data = NULL;
- retkey.dptr = dbtretkey.data;
- retkey.dsize = dbtretkey.size;
- return (retkey);
-}
-
-/*
- * Returns:
- * DATUM on success
- * NULL on failure
- */
-extern datum
-dbm_nextkey(db)
- DBM *db;
-{
- int status;
- datum retkey;
- DBT dbtretkey, dbtretdata;
-
- status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT);
- if (status)
- dbtretkey.data = NULL;
- retkey.dptr = dbtretkey.data;
- retkey.dsize = dbtretkey.size;
- return (retkey);
-}
-/*
- * Returns:
- * 0 on success
- * <0 failure
- */
-extern int
-dbm_delete(db, key)
- DBM *db;
- datum key;
-{
- int status;
- DBT dbtkey;
-
- dbtkey.data = key.dptr;
- dbtkey.size = key.dsize;
- status = (db->del)(db, &dbtkey, 0);
- if (status)
- return (-1);
- else
- return (0);
-}
-
-/*
- * Returns:
- * 0 on success
- * <0 failure
- * 1 if DBM_INSERT and entry exists
- */
-extern int
-dbm_store(db, key, data, flags)
- DBM *db;
- datum key, data;
- int flags;
-{
- DBT dbtkey, dbtdata;
-
- dbtkey.data = key.dptr;
- dbtkey.size = key.dsize;
- dbtdata.data = data.dptr;
- dbtdata.size = data.dsize;
- return ((db->put)(db, &dbtkey, &dbtdata,
- (flags == DBM_INSERT) ? R_NOOVERWRITE : 0));
-}
-
-extern int
-dbm_error(db)
- DBM *db;
-{
- HTAB *hp;
-
- hp = (HTAB *)db->internal;
- return (hp->errnum);
-}
-
-extern int
-dbm_clearerr(db)
- DBM *db;
-{
- HTAB *hp;
-
- hp = (HTAB *)db->internal;
- hp->errnum = 0;
- return (0);
-}
-
-extern int
-dbm_dirfno(db)
- DBM *db;
-{
- return(((HTAB *)db->internal)->fp);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Margo Seltzer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)page.h 8.2 (Berkeley) 5/31/94
- */
-
-/*
- * Definitions for hashing page file format.
- */
-
-/*
- * routines dealing with a data page
- *
- * page format:
- * +------------------------------+
- * p | n | keyoff | datoff | keyoff |
- * +------------+--------+--------+
- * | datoff | free | ptr | --> |
- * +--------+---------------------+
- * | F R E E A R E A |
- * +--------------+---------------+
- * | <---- - - - | data |
- * +--------+-----+----+----------+
- * | key | data | key |
- * +--------+----------+----------+
- *
- * Pointer to the free space is always: p[p[0] + 2]
- * Amount of free space on the page is: p[p[0] + 1]
- */
-
-/*
- * How many bytes required for this pair?
- * 2 shorts in the table at the top of the page + room for the
- * key and room for the data
- *
- * We prohibit entering a pair on a page unless there is also room to append
- * an overflow page. The reason for this it that you can get in a situation
- * where a single key/data pair fits on a page, but you can't append an
- * overflow page and later you'd have to split the key/data and handle like
- * a big pair.
- * You might as well do this up front.
- */
-
-#define PAIRSIZE(K,D) (2*sizeof(u_int16_t) + (K)->size + (D)->size)
-#define BIGOVERHEAD (4*sizeof(u_int16_t))
-#define KEYSIZE(K) (4*sizeof(u_int16_t) + (K)->size);
-#define OVFLSIZE (2*sizeof(u_int16_t))
-#define FREESPACE(P) ((P)[(P)[0]+1])
-#define OFFSET(P) ((P)[(P)[0]+2])
-#define PAIRFITS(P,K,D) \
- (((P)[2] >= REAL_KEY) && \
- (PAIRSIZE((K),(D)) + OVFLSIZE) <= FREESPACE((P)))
-#define PAGE_META(N) (((N)+3) * sizeof(u_int16_t))
-
-typedef struct {
- BUFHEAD *newp;
- BUFHEAD *oldp;
- BUFHEAD *nextp;
- u_int16_t next_addr;
-} SPLIT_RETURN;
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Margo Seltzer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)search.h 8.1 (Berkeley) 6/4/93
- */
-
-/* Backward compatibility to hsearch interface. */
-typedef struct entry {
- char *key;
- char *data;
-} ENTRY;
-
-typedef enum {
- FIND, ENTER
-} ACTION;
-
-int hcreate __P((unsigned int));
-void hdestroy __P((void));
-ENTRY *hsearch __P((ENTRY, ACTION));
+++ /dev/null
-/*
- * Copyright (c) 1991, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)queue.h 8.5 (Berkeley) 8/20/94
- * $FreeBSD: ports/misc/44bsd-more/files/queue.h,v 1.1 2001/01/06 03:41:36 hoek Exp $
- */
-
-/*
- * Circular queue definitions.
- */
-#define CIRCLEQ_HEAD(name, type) \
-struct name { \
- struct type *cqh_first; /* first element */ \
- struct type *cqh_last; /* last element */ \
-}
-
-#define CIRCLEQ_ENTRY(type) \
-struct { \
- struct type *cqe_next; /* next element */ \
- struct type *cqe_prev; /* previous element */ \
-}
-
-/*
- * Circular queue functions.
- */
-#define CIRCLEQ_EMPTY(head) ((head)->cqh_first == (void *)(head))
-
-#define CIRCLEQ_FIRST(head) ((head)->cqh_first)
-
-#define CIRCLEQ_FOREACH(var, head, field) \
- for((var) = (head)->cqh_first; \
- (var) != (void *)(head); \
- (var) = (var)->field.cqe_next)
-
-#define CIRCLEQ_FOREACH_REVERSE(var, head, field) \
- for((var) = (head)->cqh_last; \
- (var) != (void *)(head); \
- (var) = (var)->field.cqe_prev)
-
-#define CIRCLEQ_INIT(head) do { \
- (head)->cqh_first = (void *)(head); \
- (head)->cqh_last = (void *)(head); \
-} while (0)
-
-#define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) do { \
- (elm)->field.cqe_next = (listelm)->field.cqe_next; \
- (elm)->field.cqe_prev = (listelm); \
- if ((listelm)->field.cqe_next == (void *)(head)) \
- (head)->cqh_last = (elm); \
- else \
- (listelm)->field.cqe_next->field.cqe_prev = (elm); \
- (listelm)->field.cqe_next = (elm); \
-} while (0)
-
-#define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) do { \
- (elm)->field.cqe_next = (listelm); \
- (elm)->field.cqe_prev = (listelm)->field.cqe_prev; \
- if ((listelm)->field.cqe_prev == (void *)(head)) \
- (head)->cqh_first = (elm); \
- else \
- (listelm)->field.cqe_prev->field.cqe_next = (elm); \
- (listelm)->field.cqe_prev = (elm); \
-} while (0)
-
-#define CIRCLEQ_INSERT_HEAD(head, elm, field) do { \
- (elm)->field.cqe_next = (head)->cqh_first; \
- (elm)->field.cqe_prev = (void *)(head); \
- if ((head)->cqh_last == (void *)(head)) \
- (head)->cqh_last = (elm); \
- else \
- (head)->cqh_first->field.cqe_prev = (elm); \
- (head)->cqh_first = (elm); \
-} while (0)
-
-#define CIRCLEQ_INSERT_TAIL(head, elm, field) do { \
- (elm)->field.cqe_next = (void *)(head); \
- (elm)->field.cqe_prev = (head)->cqh_last; \
- if ((head)->cqh_first == (void *)(head)) \
- (head)->cqh_first = (elm); \
- else \
- (head)->cqh_last->field.cqe_next = (elm); \
- (head)->cqh_last = (elm); \
-} while (0)
-
-#define CIRCLEQ_LAST(head) ((head)->cqh_last)
-
-#define CIRCLEQ_NEXT(elm,field) ((elm)->field.cqe_next)
-
-#define CIRCLEQ_PREV(elm,field) ((elm)->field.cqe_prev)
-
-#define CIRCLEQ_REMOVE(head, elm, field) do { \
- if ((elm)->field.cqe_next == (void *)(head)) \
- (head)->cqh_last = (elm)->field.cqe_prev; \
- else \
- (elm)->field.cqe_next->field.cqe_prev = \
- (elm)->field.cqe_prev; \
- if ((elm)->field.cqe_prev == (void *)(head)) \
- (head)->cqh_first = (elm)->field.cqe_next; \
- else \
- (elm)->field.cqe_prev->field.cqe_next = \
- (elm)->field.cqe_next; \
-} while (0)
+++ /dev/null
-/* Values for building 4.4 BSD db routines in the GNU C library. */
-
-#ifndef _compat_h_
-#define _compat_h_
-
-#include <fcntl.h>
-
-/*
- * If you can't provide lock values in the open(2) call. Note, this
- * allows races to happen.
- */
-#ifndef O_EXLOCK /* 4.4BSD extension. */
-#define O_EXLOCK 0
-#endif
-
-#ifndef O_SHLOCK /* 4.4BSD extension. */
-#define O_SHLOCK 0
-#endif
-
-#include <errno.h>
-
-#ifndef EFTYPE
-#define EFTYPE EINVAL /* POSIX 1003.1 format errno. */
-#endif
-
-#include <unistd.h>
-#include <limits.h>
-
-#ifndef _POSIX_VDISABLE /* POSIX 1003.1 disabling char. */
-#define _POSIX_VDISABLE 0 /* Some systems used 0. */
-#endif
-
-#include <termios.h>
-
-#ifndef TCSASOFT /* 4.4BSD extension. */
-#define TCSASOFT 0
-#endif
-
-#include <sys/param.h>
-
-#ifndef MAX /* Usually found in <sys/param.h>. */
-#define MAX(_a,_b) ((_a)<(_b)?(_b):(_a))
-#endif
-#ifndef MIN /* Usually found in <sys/param.h>. */
-#define MIN(_a,_b) ((_a)<(_b)?(_a):(_b))
-#endif
-
-
-#endif /* compat.h */
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)db.h 8.7 (Berkeley) 6/16/94
- */
-
-#ifndef _DB_H
-#define _DB_H 1
-
-#include <sys/types.h>
-
-#include <limits.h>
-
-#ifdef __DBINTERFACE_PRIVATE
-#include <compat.h>
-#endif
-
-#ifdef SOLARIS
-#include "solaris-compat/compat.h"
-#endif
-
-#define RET_ERROR -1 /* Return values. */
-#define RET_SUCCESS 0
-#define RET_SPECIAL 1
-
-#ifndef __BIT_TYPES_DEFINED__
-#define __BIT_TYPES_DEFINED__
-#if (!defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__APPLE__))
-typedef __signed char int8_t;
-typedef short int16_t;
-typedef int int32_t;
-typedef unsigned char u_int8_t;
-typedef unsigned short u_int16_t;
-typedef unsigned int u_int32_t;
-#ifdef WE_DONT_NEED_QUADS
-typedef long long int64_t;
-typedef unsigned long long u_int64_t;
-#endif
-#endif /* __FreeBSD__ */
-#endif
-
-#ifdef SOLARIS
-#define __P(p) p
-#define __BEGIN_DECLS
-#define __END_DECLS
-#endif
-
-#define MAX_PAGE_NUMBER 0xffffffff /* >= # of pages in a file */
-typedef u_int32_t pgno_t;
-#define MAX_PAGE_OFFSET 65535 /* >= # of bytes in a page */
-typedef u_int16_t indx_t;
-#define MAX_REC_NUMBER 0xffffffff /* >= # of records in a tree */
-typedef u_int32_t recno_t;
-
-/* Key/data structure -- a Data-Base Thang. */
-typedef struct {
- void *data; /* data */
- size_t size; /* data length */
-} DBT;
-
-/* Routine flags. */
-#define R_CURSOR 1 /* del, put, seq */
-#define __R_UNUSED 2 /* UNUSED */
-#define R_FIRST 3 /* seq */
-#define R_IAFTER 4 /* put (RECNO) */
-#define R_IBEFORE 5 /* put (RECNO) */
-#define R_LAST 6 /* seq (BTREE, RECNO) */
-#define R_NEXT 7 /* seq */
-#define R_NOOVERWRITE 8 /* put */
-#define R_PREV 9 /* seq (BTREE, RECNO) */
-#define R_SETCURSOR 10 /* put (RECNO) */
-#define R_RECNOSYNC 11 /* sync (RECNO) */
-
-typedef enum { DB_BTREE, DB_HASH, DB_RECNO } DBTYPE;
-
-/*
- * !!!
- * The following flags are included in the dbopen(3) call as part of the
- * open(2) flags. In order to avoid conflicts with the open flags, start
- * at the top of the 16 or 32-bit number space and work our way down. If
- * the open flags were significantly expanded in the future, it could be
- * a problem. Wish I'd left another flags word in the dbopen call.
- *
- * !!!
- * None of this stuff is implemented yet. The only reason that it's here
- * is so that the access methods can skip copying the key/data pair when
- * the DB_LOCK flag isn't set.
- */
-#if UINT_MAX > 65535
-#define DB_LOCK 0x20000000 /* Do locking. */
-#define DB_SHMEM 0x40000000 /* Use shared memory. */
-#define DB_TXN 0x80000000 /* Do transactions. */
-#else
-#define DB_LOCK 0x2000 /* Do locking. */
-#define DB_SHMEM 0x4000 /* Use shared memory. */
-#define DB_TXN 0x8000 /* Do transactions. */
-#endif
-
-/* Access method description structure. */
-typedef struct __db {
- DBTYPE type; /* Underlying db type. */
- int (*close) __P((struct __db *));
- int (*del) __P((const struct __db *, const DBT *, u_int));
- int (*get) __P((const struct __db *, const DBT *, DBT *, u_int));
- int (*put) __P((const struct __db *, DBT *, const DBT *, u_int));
- int (*seq) __P((const struct __db *, DBT *, DBT *, u_int));
- int (*sync) __P((const struct __db *, u_int));
- void *internal; /* Access method private. */
- int (*fd) __P((const struct __db *));
-} DB;
-
-#define BTREEMAGIC 0x053162
-#define BTREEVERSION 3
-
-/* Structure used to pass parameters to the btree routines. */
-typedef struct {
-#define R_DUP 0x01 /* duplicate keys */
- u_long flags;
- u_int cachesize; /* bytes to cache */
- int maxkeypage; /* maximum keys per page */
- int minkeypage; /* minimum keys per page */
- u_int psize; /* page size */
- int (*compare) /* comparison function */
- __P((const DBT *, const DBT *));
- size_t (*prefix) /* prefix function */
- __P((const DBT *, const DBT *));
- int lorder; /* byte order */
-} BTREEINFO;
-
-#define HASHMAGIC 0x061561
-#define HASHVERSION 2
-
-/* Structure used to pass parameters to the hashing routines. */
-typedef struct {
- u_int bsize; /* bucket size */
- u_int ffactor; /* fill factor */
- u_int nelem; /* number of elements */
- u_int cachesize; /* bytes to cache */
- u_int32_t /* hash function */
- (*hash) __P((const void *, size_t));
- int lorder; /* byte order */
-} HASHINFO;
-
-/* Structure used to pass parameters to the record routines. */
-typedef struct {
-#define R_FIXEDLEN 0x01 /* fixed-length records */
-#define R_NOKEY 0x02 /* key not required */
-#define R_SNAPSHOT 0x04 /* snapshot the input */
- u_long flags;
- u_int cachesize; /* bytes to cache */
- u_int psize; /* page size */
- int lorder; /* byte order */
- size_t reclen; /* record length (fixed-length records) */
- u_char bval; /* delimiting byte (variable-length records */
- char *bfname; /* btree file name */
-} RECNOINFO;
-
-#ifdef __DBINTERFACE_PRIVATE
-/*
- * Little endian <==> big endian 32-bit swap macros.
- * M_32_SWAP swap a memory location
- * P_32_SWAP swap a referenced memory location
- * P_32_COPY swap from one location to another
- */
-#define M_32_SWAP(a) { \
- u_int32_t _tmp = a; \
- ((char *)&a)[0] = ((char *)&_tmp)[3]; \
- ((char *)&a)[1] = ((char *)&_tmp)[2]; \
- ((char *)&a)[2] = ((char *)&_tmp)[1]; \
- ((char *)&a)[3] = ((char *)&_tmp)[0]; \
-}
-#define P_32_SWAP(a) { \
- u_int32_t _tmp = *(u_int32_t *)a; \
- ((char *)a)[0] = ((char *)&_tmp)[3]; \
- ((char *)a)[1] = ((char *)&_tmp)[2]; \
- ((char *)a)[2] = ((char *)&_tmp)[1]; \
- ((char *)a)[3] = ((char *)&_tmp)[0]; \
-}
-#define P_32_COPY(a, b) { \
- ((char *)&(b))[0] = ((char *)&(a))[3]; \
- ((char *)&(b))[1] = ((char *)&(a))[2]; \
- ((char *)&(b))[2] = ((char *)&(a))[1]; \
- ((char *)&(b))[3] = ((char *)&(a))[0]; \
-}
-
-/*
- * Little endian <==> big endian 16-bit swap macros.
- * M_16_SWAP swap a memory location
- * P_16_SWAP swap a referenced memory location
- * P_16_COPY swap from one location to another
- */
-#define M_16_SWAP(a) { \
- u_int16_t _tmp = a; \
- ((char *)&a)[0] = ((char *)&_tmp)[1]; \
- ((char *)&a)[1] = ((char *)&_tmp)[0]; \
-}
-#define P_16_SWAP(a) { \
- u_int16_t _tmp = *(u_int16_t *)a; \
- ((char *)a)[0] = ((char *)&_tmp)[1]; \
- ((char *)a)[1] = ((char *)&_tmp)[0]; \
-}
-#define P_16_COPY(a, b) { \
- ((char *)&(b))[0] = ((char *)&(a))[1]; \
- ((char *)&(b))[1] = ((char *)&(a))[0]; \
-}
-#endif
-
-__BEGIN_DECLS
-DB *__dbopen __P((const char *, int, int, DBTYPE, const void *));
-DB *dbopen __P((const char *, int, int, DBTYPE, const void *));
-
-#ifdef __DBINTERFACE_PRIVATE
-DB *__bt_open __P((const char *, int, int, const BTREEINFO *, int));
-DB *__hash_open __P((const char *, int, int, const HASHINFO *, int));
-DB *__rec_open __P((const char *, int, int, const RECNOINFO *, int));
-void __dbpanic __P((DB *dbp));
-#endif
-__END_DECLS
-
-#endif /* db.h */
+++ /dev/null
-/*-
- * Copyright (c) 1991, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)mpool.h 8.2 (Berkeley) 7/14/94
- */
-
-#ifndef _MPOOL_H
-#define _MPOOL_H 1
-
-#include <sys/queue.h>
-#ifndef CIRCLEQ_HEAD
-#include <circ-queue.h>
-#endif
-
-/*
- * The memory pool scheme is a simple one. Each in-memory page is referenced
- * by a bucket which is threaded in up to two of three ways. All active pages
- * are threaded on a hash chain (hashed by page number) and an lru chain.
- * Inactive pages are threaded on a free chain. Each reference to a memory
- * pool is handed an opaque MPOOL cookie which stores all of this information.
- */
-#define HASHSIZE 128
-#define HASHKEY(pgno) ((pgno - 1) % HASHSIZE)
-
-/* The BKT structures are the elements of the queues. */
-typedef struct _bkt {
- CIRCLEQ_ENTRY(_bkt) hq; /* hash queue */
- CIRCLEQ_ENTRY(_bkt) q; /* lru queue */
- void *page; /* page */
- pgno_t pgno; /* page number */
-
-#define MPOOL_DIRTY 0x01 /* page needs to be written */
-#define MPOOL_PINNED 0x02 /* page is pinned into memory */
- u_int8_t flags; /* flags */
-} BKT;
-
-typedef struct MPOOL {
- CIRCLEQ_HEAD(_lqh, _bkt) lqh; /* lru queue head */
- /* hash queue array */
- CIRCLEQ_HEAD(_hqh, _bkt) hqh[HASHSIZE];
- pgno_t curcache; /* current number of cached pages */
- pgno_t maxcache; /* max number of cached pages */
- pgno_t npages; /* number of pages in the file */
- u_long pagesize; /* file page size */
- int fd; /* file descriptor */
- /* page in conversion routine */
- void (*pgin) __P((void *, pgno_t, void *));
- /* page out conversion routine */
- void (*pgout) __P((void *, pgno_t, void *));
- void *pgcookie; /* cookie for page in/out routines */
-#ifdef STATISTICS
- u_long cachehit;
- u_long cachemiss;
- u_long pagealloc;
- u_long pageflush;
- u_long pageget;
- u_long pagenew;
- u_long pageput;
- u_long pageread;
- u_long pagewrite;
-#endif
-} MPOOL;
-
-__BEGIN_DECLS
-MPOOL *__mpool_open __P((void *, int, pgno_t, pgno_t));
-MPOOL *mpool_open __P((void *, int, pgno_t, pgno_t));
-void __mpool_filter __P((MPOOL *, void (*)(void *, pgno_t, void *),
- void (*)(void *, pgno_t, void *), void *));
-void mpool_filter __P((MPOOL *, void (*)(void *, pgno_t, void *),
- void (*)(void *, pgno_t, void *), void *));
-void *__mpool_new __P((MPOOL *, pgno_t *));
-void *mpool_new __P((MPOOL *, pgno_t *));
-void *__mpool_get __P((MPOOL *, pgno_t, u_int));
-void *mpool_get __P((MPOOL *, pgno_t, u_int));
-int __mpool_put __P((MPOOL *, void *, u_int));
-int mpool_put __P((MPOOL *, void *, u_int));
-int __mpool_sync __P((MPOOL *));
-int mpool_sync __P((MPOOL *));
-int __mpool_close __P((MPOOL *));
-int mpool_close __P((MPOOL *));
-#ifdef STATISTICS
-void mpool_stat __P((MPOOL *));
-#endif
-__END_DECLS
-
-#endif /* mpool.h */
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Margo Seltzer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)ndbm.h 8.1 (Berkeley) 6/2/93
- */
-
-#ifndef _NDBM_H
-#define _NDBM_H 1
-
-#include "db.h"
-
-/* Map dbm interface onto db(3). */
-#define DBM_RDONLY O_RDONLY
-
-/* Flags to dbm_store(). */
-#define DBM_INSERT 0
-#define DBM_REPLACE 1
-
-/*
- * The db(3) support for ndbm(3) always appends this suffix to the
- * file name to avoid overwriting the user's original database.
- */
-#define DBM_SUFFIX ".db"
-
-typedef struct {
- char *dptr;
- int dsize;
-} datum;
-
-typedef DB DBM;
-#define dbm_pagfno(a) DBM_PAGFNO_NOT_AVAILABLE
-
-__BEGIN_DECLS
-void dbm_close __P((DBM *));
-int dbm_delete __P((DBM *, datum));
-datum dbm_fetch __P((DBM *, datum));
-datum dbm_firstkey __P((DBM *));
-long dbm_forder __P((DBM *, datum));
-datum dbm_nextkey __P((DBM *));
-DBM *dbm_open __P((const char *, int, int));
-int dbm_store __P((DBM *, datum, datum, int));
-int dbm_dirfno __P((DBM *));
-int dbm_error __P((DBM *));
-int dbm_clearerr __P((DBM *));
-__END_DECLS
-
-#endif /* ndbm.h */
+++ /dev/null
-GLIBC_2.0 {
- global:
- # the real DB entry point.
- dbopen; __dbopen;
-
- # The compatibility functions.
- dbm_clearerr; dbm_close; dbm_delete; dbm_dirfno; dbm_error;
- dbm_fetch; dbm_firstkey; dbm_nextkey; dbm_open; dbm_store;
- local:
- *;
-};
+++ /dev/null
-# @(#)README 8.1 (Berkeley) 6/4/93
-
-These are the current memory pool routines.
-They aren't ready for prime time, yet, and
-the interface is expected to change.
-
---keith
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)mpool.c 8.5 (Berkeley) 7/26/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/param.h>
-#include <sys/queue.h>
-#include <sys/stat.h>
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "../include/db.h"
-
-#define __MPOOLINTERFACE_PRIVATE
-#include <mpool.h>
-
-#undef __APPLE__
-
-#ifndef __APPLE__
-#define mpool_open __mpool_open
-#define mpool_filter __mpool_filter
-#define mpool_new __mpool_new
-#define mpool_get __mpool_get
-#define mpool_put __mpool_put
-#define mpool_sync __mpool_sync
-#define mpool_close __mpool_close
-#endif
-
-static BKT *mpool_bkt __P((MPOOL *));
-static BKT *mpool_look __P((MPOOL *, pgno_t));
-static int mpool_write __P((MPOOL *, BKT *));
-
-/*
- * mpool_open --
- * Initialize a memory pool.
- */
-MPOOL *
-mpool_open(key, fd, pagesize, maxcache)
- void *key;
- int fd;
- pgno_t pagesize, maxcache;
-{
- struct stat sb;
- MPOOL *mp;
- int entry;
-
- /*
- * Get information about the file.
- *
- * XXX
- * We don't currently handle pipes, although we should.
- */
- if (fstat(fd, &sb))
- return (NULL);
- if (!S_ISREG(sb.st_mode)) {
- errno = ESPIPE;
- return (NULL);
- }
-
- /* Allocate and initialize the MPOOL cookie. */
- if ((mp = (MPOOL *)calloc(1, sizeof(MPOOL))) == NULL)
- return (NULL);
- CIRCLEQ_INIT(&mp->lqh);
- for (entry = 0; entry < HASHSIZE; ++entry)
- CIRCLEQ_INIT(&mp->hqh[entry]);
- mp->maxcache = maxcache;
- mp->npages = sb.st_size / pagesize;
- mp->pagesize = pagesize;
- mp->fd = fd;
- return (mp);
-}
-
-/*
- * mpool_filter --
- * Initialize input/output filters.
- */
-void
-mpool_filter(mp, pgin, pgout, pgcookie)
- MPOOL *mp;
- void (*pgin) __P((void *, pgno_t, void *));
- void (*pgout) __P((void *, pgno_t, void *));
- void *pgcookie;
-{
- mp->pgin = pgin;
- mp->pgout = pgout;
- mp->pgcookie = pgcookie;
-}
-
-/*
- * mpool_new --
- * Get a new page of memory.
- */
-void *
-mpool_new(mp, pgnoaddr)
- MPOOL *mp;
- pgno_t *pgnoaddr;
-{
- struct _hqh *head;
- BKT *bp;
-
- if (mp->npages == MAX_PAGE_NUMBER) {
- (void)fprintf(stderr, "mpool_new: page allocation overflow.\n");
- abort();
- }
-#ifdef STATISTICS
- ++mp->pagenew;
-#endif
- /*
- * Get a BKT from the cache. Assign a new page number, attach
- * it to the head of the hash chain, the tail of the lru chain,
- * and return.
- */
- if ((bp = mpool_bkt(mp)) == NULL)
- return (NULL);
- *pgnoaddr = bp->pgno = mp->npages++;
- bp->flags = MPOOL_PINNED;
-
- head = &mp->hqh[HASHKEY(bp->pgno)];
- CIRCLEQ_INSERT_HEAD(head, bp, hq);
- CIRCLEQ_INSERT_TAIL(&mp->lqh, bp, q);
- return (bp->page);
-}
-
-/*
- * mpool_get
- * Get a page.
- */
-void *
-mpool_get(mp, pgno, flags)
- MPOOL *mp;
- pgno_t pgno;
- u_int flags; /* XXX not used? */
-{
- struct _hqh *head;
- BKT *bp;
- off_t off;
- int nr;
-
- /* Check for attempt to retrieve a non-existent page. */
- if (pgno >= mp->npages) {
- errno = EINVAL;
- return (NULL);
- }
-
-#ifdef STATISTICS
- ++mp->pageget;
-#endif
-
- /* Check for a page that is cached. */
- if ((bp = mpool_look(mp, pgno)) != NULL) {
-#ifdef DEBUG
- if (bp->flags & MPOOL_PINNED) {
- (void)fprintf(stderr,
- "mpool_get: page %d already pinned\n", bp->pgno);
- abort();
- }
-#endif
- /*
- * Move the page to the head of the hash chain and the tail
- * of the lru chain.
- */
- head = &mp->hqh[HASHKEY(bp->pgno)];
- CIRCLEQ_REMOVE(head, bp, hq);
- CIRCLEQ_INSERT_HEAD(head, bp, hq);
- CIRCLEQ_REMOVE(&mp->lqh, bp, q);
- CIRCLEQ_INSERT_TAIL(&mp->lqh, bp, q);
-
- /* Return a pinned page. */
- bp->flags |= MPOOL_PINNED;
- return (bp->page);
- }
-
- /* Get a page from the cache. */
- if ((bp = mpool_bkt(mp)) == NULL)
- return (NULL);
-
- /* Read in the contents. */
-#ifdef STATISTICS
- ++mp->pageread;
-#endif
- off = mp->pagesize * pgno;
- if (lseek(mp->fd, off, SEEK_SET) != off)
- return (NULL);
- if ((u_long) (nr = read(mp->fd, bp->page, mp->pagesize))
- != mp->pagesize) {
- if (nr >= 0)
- errno = EFTYPE;
- return (NULL);
- }
-
- /* Set the page number, pin the page. */
- bp->pgno = pgno;
- bp->flags = MPOOL_PINNED;
-
- /*
- * Add the page to the head of the hash chain and the tail
- * of the lru chain.
- */
- head = &mp->hqh[HASHKEY(bp->pgno)];
- CIRCLEQ_INSERT_HEAD(head, bp, hq);
- CIRCLEQ_INSERT_TAIL(&mp->lqh, bp, q);
-
- /* Run through the user's filter. */
- if (mp->pgin != NULL)
- (mp->pgin)(mp->pgcookie, bp->pgno, bp->page);
-
- return (bp->page);
-}
-
-/*
- * mpool_put
- * Return a page.
- */
-int
-mpool_put(mp, page, flags)
- MPOOL *mp;
- void *page;
- u_int flags;
-{
- BKT *bp;
-
-#ifdef STATISTICS
- ++mp->pageput;
-#endif
- bp = (BKT *)((char *)page - sizeof(BKT));
-#ifdef DEBUG
- if (!(bp->flags & MPOOL_PINNED)) {
- (void)fprintf(stderr,
- "mpool_put: page %d not pinned\n", bp->pgno);
- abort();
- }
-#endif
- bp->flags &= ~MPOOL_PINNED;
- bp->flags |= flags & MPOOL_DIRTY;
- return (RET_SUCCESS);
-}
-
-/*
- * mpool_close
- * Close the buffer pool.
- */
-int
-mpool_close(mp)
- MPOOL *mp;
-{
- BKT *bp;
-
- /* Free up any space allocated to the lru pages. */
- while ((bp = mp->lqh.cqh_first) != (void *)&mp->lqh) {
- CIRCLEQ_REMOVE(&mp->lqh, mp->lqh.cqh_first, q);
- free(bp);
- }
-
- /* Free the MPOOL cookie. */
- free(mp);
- return (RET_SUCCESS);
-}
-
-/*
- * mpool_sync
- * Sync the pool to disk.
- */
-int
-mpool_sync(mp)
- MPOOL *mp;
-{
- BKT *bp;
-
- /* Walk the lru chain, flushing any dirty pages to disk. */
- for (bp = mp->lqh.cqh_first;
- bp != (void *)&mp->lqh; bp = bp->q.cqe_next)
- if (bp->flags & MPOOL_DIRTY &&
- mpool_write(mp, bp) == RET_ERROR)
- return (RET_ERROR);
-
- /* Sync the file descriptor. */
- return (fsync(mp->fd) ? RET_ERROR : RET_SUCCESS);
-}
-
-#define __APPLE__
-
-#ifndef __APPLE__
-#undef mpool_open
-#undef mpool_filter
-#undef mpool_new
-#undef mpool_get
-#undef mpool_put
-#undef mpool_close
-#undef mpool_sync
-
-#define weak_alias(original, alias) \
- asm (".weak " #alias "\n" #alias " = " #original);
-weak_alias (__mpool_open, mpool_open)
-weak_alias (__mpool_filter, mpool_filter)
-weak_alias (__mpool_new, mpool_new)
-weak_alias (__mpool_get, mpool_get)
-weak_alias (__mpool_put, mpool_put)
-weak_alias (__mpool_close, mpool_close)
-weak_alias (__mpool_sync, mpool_sync)
-#endif
-
-/*
- * mpool_bkt
- * Get a page from the cache (or create one).
- */
-static BKT *
-mpool_bkt(mp)
- MPOOL *mp;
-{
- struct _hqh *head;
- BKT *bp;
-
- /* If under the max cached, always create a new page. */
- if (mp->curcache < mp->maxcache)
- goto new;
-
- /*
- * If the cache is max'd out, walk the lru list for a buffer we
- * can flush. If we find one, write it (if necessary) and take it
- * off any lists. If we don't find anything we grow the cache anyway.
- * The cache never shrinks.
- */
- for (bp = mp->lqh.cqh_first;
- bp != (void *)&mp->lqh; bp = bp->q.cqe_next)
- if (!(bp->flags & MPOOL_PINNED)) {
- /* Flush if dirty. */
- if (bp->flags & MPOOL_DIRTY &&
- mpool_write(mp, bp) == RET_ERROR)
- return (NULL);
-#ifdef STATISTICS
- ++mp->pageflush;
-#endif
- /* Remove from the hash and lru queues. */
- head = &mp->hqh[HASHKEY(bp->pgno)];
- CIRCLEQ_REMOVE(head, bp, hq);
- CIRCLEQ_REMOVE(&mp->lqh, bp, q);
-#ifdef DEBUG
- { void *spage;
- spage = bp->page;
- memset(bp, 0xff, sizeof(BKT) + mp->pagesize);
- bp->page = spage;
- }
-#endif
- return (bp);
- }
-
-new: if ((bp = (BKT *) calloc(1, sizeof(BKT) + mp->pagesize)) == NULL)
- return (NULL);
-#ifdef STATISTICS
- ++mp->pagealloc;
-#endif
-#if defined(DEBUG) || defined(PURIFY)
- memset(bp, 0xff, sizeof(BKT) + mp->pagesize);
-#endif
- bp->page = (char *)bp + sizeof(BKT);
- ++mp->curcache;
- return (bp);
-}
-
-/*
- * mpool_write
- * Write a page to disk.
- */
-static int
-mpool_write(mp, bp)
- MPOOL *mp;
- BKT *bp;
-{
- off_t off;
-
-#ifdef STATISTICS
- ++mp->pagewrite;
-#endif
-
- /* Run through the user's filter. */
- if (mp->pgout)
- (mp->pgout)(mp->pgcookie, bp->pgno, bp->page);
-
- off = mp->pagesize * bp->pgno;
- if (lseek(mp->fd, off, SEEK_SET) != off)
- return (RET_ERROR);
- if ((u_long) write(mp->fd, bp->page, mp->pagesize) != mp->pagesize)
- return (RET_ERROR);
-
- bp->flags &= ~MPOOL_DIRTY;
- return (RET_SUCCESS);
-}
-
-/*
- * mpool_look
- * Lookup a page in the cache.
- */
-static BKT *
-mpool_look(mp, pgno)
- MPOOL *mp;
- pgno_t pgno;
-{
- struct _hqh *head;
- BKT *bp;
-
- head = &mp->hqh[HASHKEY(pgno)];
- for (bp = head->cqh_first; bp != (void *)head; bp = bp->hq.cqe_next)
- if (bp->pgno == pgno) {
-#ifdef STATISTICS
- ++mp->cachehit;
-#endif
- return (bp);
- }
-#ifdef STATISTICS
- ++mp->cachemiss;
-#endif
- return (NULL);
-}
-
-#ifdef STATISTICS
-/*
- * mpool_stat
- * Print out cache statistics.
- */
-void
-mpool_stat(mp)
- MPOOL *mp;
-{
- BKT *bp;
- int cnt;
- char *sep;
-
- (void)fprintf(stderr, "%lu pages in the file\n", mp->npages);
- (void)fprintf(stderr,
- "page size %lu, caching %lu pages of %lu page max cache\n",
- mp->pagesize, mp->curcache, mp->maxcache);
- (void)fprintf(stderr, "%lu page puts, %lu page gets, %lu page new\n",
- mp->pageput, mp->pageget, mp->pagenew);
- (void)fprintf(stderr, "%lu page allocs, %lu page flushes\n",
- mp->pagealloc, mp->pageflush);
- if (mp->cachehit + mp->cachemiss)
- (void)fprintf(stderr,
- "%.0f%% cache hit rate (%lu hits, %lu misses)\n",
- ((double)mp->cachehit / (mp->cachehit + mp->cachemiss))
- * 100, mp->cachehit, mp->cachemiss);
- (void)fprintf(stderr, "%lu page reads, %lu page writes\n",
- mp->pageread, mp->pagewrite);
-
- sep = "";
- cnt = 0;
- for (bp = mp->lqh.cqh_first;
- bp != (void *)&mp->lqh; bp = bp->q.cqe_next) {
- (void)fprintf(stderr, "%s%d", sep, bp->pgno);
- if (bp->flags & MPOOL_DIRTY)
- (void)fprintf(stderr, "d");
- if (bp->flags & MPOOL_PINNED)
- (void)fprintf(stderr, "P");
- if (++cnt == 10) {
- sep = "\n";
- cnt = 0;
- } else
- sep = ", ";
-
- }
- (void)fprintf(stderr, "\n");
-}
-#endif
+++ /dev/null
-/*-
- * Copyright (c) 1991, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)extern.h 8.3 (Berkeley) 6/4/94
- */
-
-#include "../btree/extern.h"
-
-int __rec_close __P((DB *));
-int __rec_delete __P((const DB *, const DBT *, u_int));
-int __rec_dleaf __P((BTREE *, PAGE *, u_int32_t));
-int __rec_fd __P((const DB *));
-int __rec_fmap __P((BTREE *, recno_t));
-int __rec_fout __P((BTREE *));
-int __rec_fpipe __P((BTREE *, recno_t));
-int __rec_get __P((const DB *, const DBT *, DBT *, u_int));
-int __rec_iput __P((BTREE *, recno_t, const DBT *, u_int));
-int __rec_put __P((const DB *dbp, DBT *, const DBT *, u_int));
-int __rec_ret __P((BTREE *, EPG *, recno_t, DBT *, DBT *));
-EPG *__rec_search __P((BTREE *, recno_t, enum SRCHOP));
-int __rec_seq __P((const DB *, DBT *, DBT *, u_int));
-int __rec_sync __P((const DB *, u_int));
-int __rec_vmap __P((BTREE *, recno_t));
-int __rec_vout __P((BTREE *));
-int __rec_vpipe __P((BTREE *, recno_t));
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)rec_close.c 8.6 (Berkeley) 8/18/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-#include <sys/uio.h>
-#include <sys/mman.h>
-
-#include <errno.h>
-#include <limits.h>
-#include <stdio.h>
-#include <unistd.h>
-
-#include "../include/db.h"
-#include "recno.h"
-
-/*
- * __REC_CLOSE -- Close a recno tree.
- *
- * Parameters:
- * dbp: pointer to access method
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- */
-int
-__rec_close(dbp)
- DB *dbp;
-{
- BTREE *t;
- int status;
-
- t = dbp->internal;
-
- /* Toss any page pinned across calls. */
- if (t->bt_pinned != NULL) {
- mpool_put(t->bt_mp, t->bt_pinned, 0);
- t->bt_pinned = NULL;
- }
-
- if (__rec_sync(dbp, 0) == RET_ERROR)
- return (RET_ERROR);
-
- /* Committed to closing. */
- status = RET_SUCCESS;
- if (F_ISSET(t, R_MEMMAPPED) && munmap(t->bt_smap, t->bt_msize))
- status = RET_ERROR;
-
- if (!F_ISSET(t, R_INMEM)) {
- if (F_ISSET(t, R_CLOSEFP)) {
- if (fclose(t->bt_rfp))
- status = RET_ERROR;
- } else
- if (close(t->bt_rfd))
- status = RET_ERROR;
- }
-
- if (__bt_close(dbp) == RET_ERROR)
- status = RET_ERROR;
-
- return (status);
-}
-
-/*
- * __REC_SYNC -- sync the recno tree to disk.
- *
- * Parameters:
- * dbp: pointer to access method
- *
- * Returns:
- * RET_SUCCESS, RET_ERROR.
- */
-int
-__rec_sync(dbp, flags)
- const DB *dbp;
- u_int flags;
-{
- struct iovec iov[2];
- BTREE *t;
- DBT data, key;
- off_t off;
- recno_t scursor, trec;
- int status;
-
- t = dbp->internal;
-
- /* Toss any page pinned across calls. */
- if (t->bt_pinned != NULL) {
- mpool_put(t->bt_mp, t->bt_pinned, 0);
- t->bt_pinned = NULL;
- }
-
- if (flags == R_RECNOSYNC)
- return (__bt_sync(dbp, 0));
-
- if (F_ISSET(t, R_RDONLY | R_INMEM) || !F_ISSET(t, R_MODIFIED))
- return (RET_SUCCESS);
-
- /* Read any remaining records into the tree. */
- if (!F_ISSET(t, R_EOF) && t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
- return (RET_ERROR);
-
- /* Rewind the file descriptor. */
- if (lseek(t->bt_rfd, (off_t)0, SEEK_SET) != 0)
- return (RET_ERROR);
-
- /* Save the cursor. */
- scursor = t->bt_cursor.rcursor;
-
- key.size = sizeof(recno_t);
- key.data = &trec;
-
- if (F_ISSET(t, R_FIXLEN)) {
- /*
- * We assume that fixed length records are all fixed length.
- * Any that aren't are either EINVAL'd or corrected by the
- * record put code.
- */
- status = (dbp->seq)(dbp, &key, &data, R_FIRST);
- while (status == RET_SUCCESS) {
- if ((size_t) write(t->bt_rfd, data.data, data.size) != data.size)
- return (RET_ERROR);
- status = (dbp->seq)(dbp, &key, &data, R_NEXT);
- }
- } else {
- iov[1].iov_base = &t->bt_bval;
- iov[1].iov_len = 1;
-
- status = (dbp->seq)(dbp, &key, &data, R_FIRST);
- while (status == RET_SUCCESS) {
- iov[0].iov_base = data.data;
- iov[0].iov_len = data.size;
- if ((size_t) writev(t->bt_rfd, iov, 2) != data.size + 1)
- return (RET_ERROR);
- status = (dbp->seq)(dbp, &key, &data, R_NEXT);
- }
- }
-
- /* Restore the cursor. */
- t->bt_cursor.rcursor = scursor;
-
- if (status == RET_ERROR)
- return (RET_ERROR);
- if ((off = lseek(t->bt_rfd, (off_t)0, SEEK_CUR)) == -1)
- return (RET_ERROR);
- if (ftruncate(t->bt_rfd, off))
- return (RET_ERROR);
- F_CLR(t, R_MODIFIED);
- return (RET_SUCCESS);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Mike Olson.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)rec_delete.c 8.7 (Berkeley) 7/14/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <errno.h>
-#include <stdio.h>
-#include <string.h>
-
-#include "../include/db.h"
-#include "recno.h"
-
-static int rec_rdelete __P((BTREE *, recno_t));
-
-/*
- * __REC_DELETE -- Delete the item(s) referenced by a key.
- *
- * Parameters:
- * dbp: pointer to access method
- * key: key to delete
- * flags: R_CURSOR if deleting what the cursor references
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
- */
-int
-__rec_delete(dbp, key, flags)
- const DB *dbp;
- const DBT *key;
- u_int flags;
-{
- BTREE *t;
- recno_t nrec;
- int status;
-
- t = dbp->internal;
-
- /* Toss any page pinned across calls. */
- if (t->bt_pinned != NULL) {
- mpool_put(t->bt_mp, t->bt_pinned, 0);
- t->bt_pinned = NULL;
- }
-
- switch(flags) {
- case 0:
- if ((nrec = *(recno_t *)key->data) == 0)
- goto einval;
- if (nrec > t->bt_nrecs)
- return (RET_SPECIAL);
- --nrec;
- status = rec_rdelete(t, nrec);
- break;
- case R_CURSOR:
- if (!F_ISSET(&t->bt_cursor, CURS_INIT))
- goto einval;
- if (t->bt_nrecs == 0)
- return (RET_SPECIAL);
- status = rec_rdelete(t, t->bt_cursor.rcursor - 1);
- if (status == RET_SUCCESS)
- --t->bt_cursor.rcursor;
- break;
- default:
-einval: errno = EINVAL;
- return (RET_ERROR);
- }
-
- if (status == RET_SUCCESS)
- F_SET(t, B_MODIFIED | R_MODIFIED);
- return (status);
-}
-
-/*
- * REC_RDELETE -- Delete the data matching the specified key.
- *
- * Parameters:
- * tree: tree
- * nrec: record to delete
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
- */
-static int
-rec_rdelete(t, nrec)
- BTREE *t;
- recno_t nrec;
-{
- EPG *e;
- PAGE *h;
- int status;
-
- /* Find the record; __rec_search pins the page. */
- if ((e = __rec_search(t, nrec, SDELETE)) == NULL)
- return (RET_ERROR);
-
- /* Delete the record. */
- h = e->page;
- status = __rec_dleaf(t, h, e->index);
- if (status != RET_SUCCESS) {
- mpool_put(t->bt_mp, h, 0);
- return (status);
- }
- mpool_put(t->bt_mp, h, MPOOL_DIRTY);
- return (RET_SUCCESS);
-}
-
-/*
- * __REC_DLEAF -- Delete a single record from a recno leaf page.
- *
- * Parameters:
- * t: tree
- * index: index on current page to delete
- *
- * Returns:
- * RET_SUCCESS, RET_ERROR.
- */
-int
-__rec_dleaf(t, h, idx)
- BTREE *t;
- PAGE *h;
- u_int32_t idx;
-{
- RLEAF *rl;
- indx_t *ip, cnt, offset;
- u_int32_t nbytes;
- char *from;
- void *to;
-
- /*
- * Delete a record from a recno leaf page. Internal records are never
- * deleted from internal pages, regardless of the records that caused
- * them to be added being deleted. Pages made empty by deletion are
- * not reclaimed. They are, however, made available for reuse.
- *
- * Pack the remaining entries at the end of the page, shift the indices
- * down, overwriting the deleted record and its index. If the record
- * uses overflow pages, make them available for reuse.
- */
- to = rl = GETRLEAF(h, idx);
- if (rl->flags & P_BIGDATA && __ovfl_delete(t, rl->bytes) == RET_ERROR)
- return (RET_ERROR);
- nbytes = NRLEAF(rl);
-
- /*
- * Compress the key/data pairs. Compress and adjust the [BR]LEAF
- * offsets. Reset the headers.
- */
- from = (char *)h + h->upper;
- memmove(from + nbytes, from, (char *)to - from);
- h->upper += nbytes;
-
- offset = h->linp[idx];
- for (cnt = &h->linp[idx] - (ip = &h->linp[0]); cnt--; ++ip)
- if (ip[0] < offset)
- ip[0] += nbytes;
- for (cnt = &h->linp[NEXTINDEX(h)] - ip; --cnt; ++ip)
- ip[0] = ip[1] < offset ? ip[1] + nbytes : ip[1];
- h->lower -= sizeof(indx_t);
- --t->bt_nrecs;
- return (RET_SUCCESS);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)rec_get.c 8.9 (Berkeley) 8/18/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <errno.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "../include/db.h"
-#include "recno.h"
-
-/*
- * __REC_GET -- Get a record from the btree.
- *
- * Parameters:
- * dbp: pointer to access method
- * key: key to find
- * data: data to return
- * flag: currently unused
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
- */
-int
-__rec_get(dbp, key, data, flags)
- const DB *dbp;
- const DBT *key;
- DBT *data;
- u_int flags;
-{
- BTREE *t;
- EPG *e;
- recno_t nrec;
- int status;
-
- t = dbp->internal;
-
- /* Toss any page pinned across calls. */
- if (t->bt_pinned != NULL) {
- mpool_put(t->bt_mp, t->bt_pinned, 0);
- t->bt_pinned = NULL;
- }
-
- /* Get currently doesn't take any flags, and keys of 0 are illegal. */
- if (flags || (nrec = *(recno_t *)key->data) == 0) {
- errno = EINVAL;
- return (RET_ERROR);
- }
-
- /*
- * If we haven't seen this record yet, try to find it in the
- * original file.
- */
- if (nrec > t->bt_nrecs) {
- if (F_ISSET(t, R_EOF | R_INMEM))
- return (RET_SPECIAL);
- if ((status = t->bt_irec(t, nrec)) != RET_SUCCESS)
- return (status);
- }
-
- --nrec;
- if ((e = __rec_search(t, nrec, SEARCH)) == NULL)
- return (RET_ERROR);
-
- status = __rec_ret(t, e, 0, NULL, data);
- if (F_ISSET(t, B_DB_LOCK))
- mpool_put(t->bt_mp, e->page, 0);
- else
- t->bt_pinned = e->page;
- return (status);
-}
-
-/*
- * __REC_FPIPE -- Get fixed length records from a pipe.
- *
- * Parameters:
- * t: tree
- * cnt: records to read
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- */
-int
-__rec_fpipe(t, top)
- BTREE *t;
- recno_t top;
-{
- DBT data;
- recno_t nrec;
- size_t len;
- int ch;
- u_char *p;
-
- if (t->bt_rdata.size < t->bt_reclen) {
- t->bt_rdata.data = t->bt_rdata.data == NULL ?
- malloc(t->bt_reclen) :
- realloc(t->bt_rdata.data, t->bt_reclen);
- if (t->bt_rdata.data == NULL)
- return (RET_ERROR);
- t->bt_rdata.size = t->bt_reclen;
- }
- data.data = t->bt_rdata.data;
- data.size = t->bt_reclen;
-
- for (nrec = t->bt_nrecs; nrec < top;) {
- len = t->bt_reclen;
- for (p = t->bt_rdata.data;; *p++ = ch)
- if ((ch = getc(t->bt_rfp)) == EOF || !--len) {
- if (ch != EOF)
- *p = ch;
- if (len != 0)
- memset(p, t->bt_bval, len);
- if (__rec_iput(t,
- nrec, &data, 0) != RET_SUCCESS)
- return (RET_ERROR);
- ++nrec;
- break;
- }
- if (ch == EOF)
- break;
- }
- if (nrec < top) {
- F_SET(t, R_EOF);
- return (RET_SPECIAL);
- }
- return (RET_SUCCESS);
-}
-
-/*
- * __REC_VPIPE -- Get variable length records from a pipe.
- *
- * Parameters:
- * t: tree
- * cnt: records to read
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- */
-int
-__rec_vpipe(t, top)
- BTREE *t;
- recno_t top;
-{
- DBT data;
- recno_t nrec;
- indx_t len;
- size_t sz;
- int bval, ch;
- u_char *p;
-
- bval = t->bt_bval;
- for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
- for (p = t->bt_rdata.data,
- sz = t->bt_rdata.size;; *p++ = ch, --sz) {
- if ((ch = getc(t->bt_rfp)) == EOF || ch == bval) {
- data.data = t->bt_rdata.data;
- data.size = p - (u_char *)t->bt_rdata.data;
- if (ch == EOF && data.size == 0)
- break;
- if (__rec_iput(t, nrec, &data, 0)
- != RET_SUCCESS)
- return (RET_ERROR);
- break;
- }
- if (sz == 0) {
- len = p - (u_char *)t->bt_rdata.data;
- t->bt_rdata.size += (sz = 256);
- t->bt_rdata.data = t->bt_rdata.data == NULL ?
- malloc(t->bt_rdata.size) :
- realloc(t->bt_rdata.data, t->bt_rdata.size);
- if (t->bt_rdata.data == NULL)
- return (RET_ERROR);
- p = (u_char *)t->bt_rdata.data + len;
- }
- }
- if (ch == EOF)
- break;
- }
- if (nrec < top) {
- F_SET(t, R_EOF);
- return (RET_SPECIAL);
- }
- return (RET_SUCCESS);
-}
-
-/*
- * __REC_FMAP -- Get fixed length records from a file.
- *
- * Parameters:
- * t: tree
- * cnt: records to read
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- */
-int
-__rec_fmap(t, top)
- BTREE *t;
- recno_t top;
-{
- DBT data;
- recno_t nrec;
- u_char *sp, *ep, *p;
- size_t len;
-
- if (t->bt_rdata.size < t->bt_reclen) {
- t->bt_rdata.data = t->bt_rdata.data == NULL ?
- malloc(t->bt_reclen) :
- realloc(t->bt_rdata.data, t->bt_reclen);
- if (t->bt_rdata.data == NULL)
- return (RET_ERROR);
- t->bt_rdata.size = t->bt_reclen;
- }
- data.data = t->bt_rdata.data;
- data.size = t->bt_reclen;
-
- sp = (u_char *)t->bt_cmap;
- ep = (u_char *)t->bt_emap;
- for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
- if (sp >= ep) {
- F_SET(t, R_EOF);
- return (RET_SPECIAL);
- }
- len = t->bt_reclen;
- for (p = t->bt_rdata.data;
- sp < ep && len > 0; *p++ = *sp++, --len);
- if (len != 0)
- memset(p, t->bt_bval, len);
- if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
- return (RET_ERROR);
- }
- t->bt_cmap = (caddr_t)sp;
- return (RET_SUCCESS);
-}
-
-/*
- * __REC_VMAP -- Get variable length records from a file.
- *
- * Parameters:
- * t: tree
- * cnt: records to read
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- */
-int
-__rec_vmap(t, top)
- BTREE *t;
- recno_t top;
-{
- DBT data;
- u_char *sp, *ep;
- recno_t nrec;
- int bval;
-
- sp = (u_char *)t->bt_cmap;
- ep = (u_char *)t->bt_emap;
- bval = t->bt_bval;
-
- for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
- if (sp >= ep) {
- F_SET(t, R_EOF);
- return (RET_SPECIAL);
- }
- for (data.data = sp; sp < ep && *sp != bval; ++sp);
- data.size = sp - (u_char *)data.data;
- if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
- return (RET_ERROR);
- ++sp;
- }
- t->bt_cmap = (caddr_t)sp;
- return (RET_SUCCESS);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Mike Olson.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)rec_open.c 8.10 (Berkeley) 9/1/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-
-#include <errno.h>
-#include <fcntl.h>
-#include <limits.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <unistd.h>
-
-#include "../include/db.h"
-#include "recno.h"
-
-DB *
-__rec_open(fname, flags, mode, openinfo, dflags)
- const char *fname;
- int flags, mode, dflags;
- const RECNOINFO *openinfo;
-{
- BTREE *t;
- BTREEINFO btopeninfo;
- DB *dbp;
- PAGE *h;
- struct stat sb;
- int rfd = 0, sverrno;
-
- /* Open the user's file -- if this fails, we're done. */
- if (fname != NULL && (rfd = open(fname, flags, mode)) < 0)
- return (NULL);
-
- /* Create a btree in memory (backed by disk). */
- dbp = NULL;
- if (openinfo) {
- if (openinfo->flags & ~(R_FIXEDLEN | R_NOKEY | R_SNAPSHOT))
- goto einval;
- btopeninfo.flags = 0;
- btopeninfo.cachesize = openinfo->cachesize;
- btopeninfo.maxkeypage = 0;
- btopeninfo.minkeypage = 0;
- btopeninfo.psize = openinfo->psize;
- btopeninfo.compare = NULL;
- btopeninfo.prefix = NULL;
- btopeninfo.lorder = openinfo->lorder;
- dbp = __bt_open(openinfo->bfname,
- O_RDWR, S_IRUSR | S_IWUSR, &btopeninfo, dflags);
- } else
- dbp = __bt_open(NULL, O_RDWR, S_IRUSR | S_IWUSR, NULL, dflags);
- if (dbp == NULL)
- goto err;
-
- /*
- * Some fields in the tree structure are recno specific. Fill them
- * in and make the btree structure look like a recno structure. We
- * don't change the bt_ovflsize value, it's close enough and slightly
- * bigger.
- */
- t = dbp->internal;
- if (openinfo) {
- if (openinfo->flags & R_FIXEDLEN) {
- F_SET(t, R_FIXLEN);
- t->bt_reclen = openinfo->reclen;
- if (t->bt_reclen == 0)
- goto einval;
- }
- t->bt_bval = openinfo->bval;
- } else
- t->bt_bval = '\n';
-
- F_SET(t, R_RECNO);
- if (fname == NULL)
- F_SET(t, R_EOF | R_INMEM);
- else
- t->bt_rfd = rfd;
-
- if (fname != NULL) {
- /*
- * In 4.4BSD, stat(2) returns true for ISSOCK on pipes.
- * Unfortunately, that's not portable, so we use lseek
- * and check the errno values.
- */
- errno = 0;
- if (lseek(rfd, (off_t)0, SEEK_CUR) == -1 && errno == ESPIPE) {
- switch (flags & O_ACCMODE) {
- case O_RDONLY:
- F_SET(t, R_RDONLY);
- break;
- default:
- goto einval;
- }
-slow: if ((t->bt_rfp = fdopen(rfd, "r")) == NULL)
- goto err;
- F_SET(t, R_CLOSEFP);
- t->bt_irec =
- F_ISSET(t, R_FIXLEN) ? __rec_fpipe : __rec_vpipe;
- } else {
- switch (flags & O_ACCMODE) {
- case O_RDONLY:
- F_SET(t, R_RDONLY);
- break;
- case O_RDWR:
- break;
- default:
- goto einval;
- }
-
- if (fstat(rfd, &sb))
- goto err;
- /*
- * Kluge -- we'd like to test to see if the file is too
- * big to mmap. Since, we don't know what size or type
- * off_t's or size_t's are, what the largest unsigned
- * integral type is, or what random insanity the local
- * C compiler will perpetrate, doing the comparison in
- * a portable way is flatly impossible. Hope that mmap
- * fails if the file is too large.
- */
- if (sb.st_size == 0)
- F_SET(t, R_EOF);
- else {
-#ifdef MMAP_NOT_AVAILABLE
- /*
- * XXX
- * Mmap doesn't work correctly on many current
- * systems. In particular, it can fail subtly,
- * with cache coherency problems. Don't use it
- * for now.
- */
- t->bt_msize = sb.st_size;
- if ((t->bt_smap = mmap(NULL, t->bt_msize,
- PROT_READ, MAP_PRIVATE, rfd,
- (off_t)0)) == MAP_FAILED
- goto slow;
- t->bt_cmap = t->bt_smap;
- t->bt_emap = t->bt_smap + sb.st_size;
- t->bt_irec = F_ISSET(t, R_FIXLEN) ?
- __rec_fmap : __rec_vmap;
- F_SET(t, R_MEMMAPPED);
-#else
- goto slow;
-#endif
- }
- }
- }
-
- /* Use the recno routines. */
- dbp->close = __rec_close;
- dbp->del = __rec_delete;
- dbp->fd = __rec_fd;
- dbp->get = __rec_get;
- dbp->put = __rec_put;
- dbp->seq = __rec_seq;
- dbp->sync = __rec_sync;
-
- /* If the root page was created, reset the flags. */
- if ((h = mpool_get(t->bt_mp, P_ROOT, 0)) == NULL)
- goto err;
- if ((h->flags & P_TYPE) == P_BLEAF) {
- F_CLR(h, P_TYPE);
- F_SET(h, P_RLEAF);
- mpool_put(t->bt_mp, h, MPOOL_DIRTY);
- } else
- mpool_put(t->bt_mp, h, 0);
-
- if (openinfo && openinfo->flags & R_SNAPSHOT &&
- !F_ISSET(t, R_EOF | R_INMEM) &&
- t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
- goto err;
- return (dbp);
-
-einval: errno = EINVAL;
-err: sverrno = errno;
- if (dbp != NULL)
- (void)__bt_close(dbp);
- if (fname != NULL)
- (void)close(rfd);
- errno = sverrno;
- return (NULL);
-}
-
-int
-__rec_fd(dbp)
- const DB *dbp;
-{
- BTREE *t;
-
- t = dbp->internal;
-
- /* Toss any page pinned across calls. */
- if (t->bt_pinned != NULL) {
- mpool_put(t->bt_mp, t->bt_pinned, 0);
- t->bt_pinned = NULL;
- }
-
- /* In-memory database can't have a file descriptor. */
- if (F_ISSET(t, R_INMEM)) {
- errno = ENOENT;
- return (-1);
- }
- return (t->bt_rfd);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)rec_put.c 8.7 (Berkeley) 8/18/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "../include/db.h"
-#include "recno.h"
-
-/*
- * __REC_PUT -- Add a recno item to the tree.
- *
- * Parameters:
- * dbp: pointer to access method
- * key: key
- * data: data
- * flag: R_CURSOR, R_IAFTER, R_IBEFORE, R_NOOVERWRITE
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key is
- * already in the tree and R_NOOVERWRITE specified.
- */
-int
-__rec_put(dbp, key, data, flags)
- const DB *dbp;
- DBT *key;
- const DBT *data;
- u_int flags;
-{
- BTREE *t;
- DBT fdata, tdata;
- recno_t nrec;
- int status;
-
- t = dbp->internal;
-
- /* Toss any page pinned across calls. */
- if (t->bt_pinned != NULL) {
- mpool_put(t->bt_mp, t->bt_pinned, 0);
- t->bt_pinned = NULL;
- }
-
- /*
- * If using fixed-length records, and the record is long, return
- * EINVAL. If it's short, pad it out. Use the record data return
- * memory, it's only short-term.
- */
- if (F_ISSET(t, R_FIXLEN) && data->size != t->bt_reclen) {
- if (data->size > t->bt_reclen)
- goto einval;
-
- if (t->bt_rdata.size < t->bt_reclen) {
- t->bt_rdata.data = t->bt_rdata.data == NULL ?
- malloc(t->bt_reclen) :
- realloc(t->bt_rdata.data, t->bt_reclen);
- if (t->bt_rdata.data == NULL)
- return (RET_ERROR);
- t->bt_rdata.size = t->bt_reclen;
- }
- memmove(t->bt_rdata.data, data->data, data->size);
- memset((char *)t->bt_rdata.data + data->size,
- t->bt_bval, t->bt_reclen - data->size);
- fdata.data = t->bt_rdata.data;
- fdata.size = t->bt_reclen;
- } else {
- fdata.data = data->data;
- fdata.size = data->size;
- }
-
- switch (flags) {
- case R_CURSOR:
- if (!F_ISSET(&t->bt_cursor, CURS_INIT))
- goto einval;
- nrec = t->bt_cursor.rcursor;
- break;
- case R_SETCURSOR:
- if ((nrec = *(recno_t *)key->data) == 0)
- goto einval;
- break;
- case R_IAFTER:
- if ((nrec = *(recno_t *)key->data) == 0) {
- nrec = 1;
- flags = R_IBEFORE;
- }
- break;
- case 0:
- case R_IBEFORE:
- if ((nrec = *(recno_t *)key->data) == 0)
- goto einval;
- break;
- case R_NOOVERWRITE:
- if ((nrec = *(recno_t *)key->data) == 0)
- goto einval;
- if (nrec <= t->bt_nrecs)
- return (RET_SPECIAL);
- break;
- default:
-einval: errno = EINVAL;
- return (RET_ERROR);
- }
-
- /*
- * Make sure that records up to and including the put record are
- * already in the database. If skipping records, create empty ones.
- */
- if (nrec > t->bt_nrecs) {
- if (!F_ISSET(t, R_EOF | R_INMEM) &&
- t->bt_irec(t, nrec) == RET_ERROR)
- return (RET_ERROR);
- if (nrec > t->bt_nrecs + 1) {
- if (F_ISSET(t, R_FIXLEN)) {
- if ((tdata.data =
- (void *)malloc(t->bt_reclen)) == NULL)
- return (RET_ERROR);
- tdata.size = t->bt_reclen;
- memset(tdata.data, t->bt_bval, tdata.size);
- } else {
- tdata.data = NULL;
- tdata.size = 0;
- }
- while (nrec > t->bt_nrecs + 1)
- if (__rec_iput(t,
- t->bt_nrecs, &tdata, 0) != RET_SUCCESS)
- return (RET_ERROR);
- if (F_ISSET(t, R_FIXLEN))
- free(tdata.data);
- }
- }
-
- if ((status = __rec_iput(t, nrec - 1, &fdata, flags)) != RET_SUCCESS)
- return (status);
-
- if (flags == R_SETCURSOR)
- t->bt_cursor.rcursor = nrec;
-
- F_SET(t, R_MODIFIED);
- return (__rec_ret(t, NULL, nrec, key, NULL));
-}
-
-/*
- * __REC_IPUT -- Add a recno item to the tree.
- *
- * Parameters:
- * t: tree
- * nrec: record number
- * data: data
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS
- */
-int
-__rec_iput(t, nrec, data, flags)
- BTREE *t;
- recno_t nrec;
- const DBT *data;
- u_int flags;
-{
- DBT tdata;
- EPG *e;
- PAGE *h;
- indx_t idx, nxtindex;
- pgno_t pg;
- u_int32_t nbytes;
- int dflags, status;
- char *dest, db[NOVFLSIZE];
-
- /*
- * If the data won't fit on a page, store it on indirect pages.
- *
- * XXX
- * If the insert fails later on, these pages aren't recovered.
- */
- if (data->size > t->bt_ovflsize) {
- if (__ovfl_put(t, data, &pg) == RET_ERROR)
- return (RET_ERROR);
- tdata.data = db;
- tdata.size = NOVFLSIZE;
- *(pgno_t *)db = pg;
- *(u_int32_t *)(db + sizeof(pgno_t)) = data->size;
- dflags = P_BIGDATA;
- data = &tdata;
- } else
- dflags = 0;
-
- /* __rec_search pins the returned page. */
- if ((e = __rec_search(t, nrec,
- nrec > t->bt_nrecs || flags == R_IAFTER || flags == R_IBEFORE ?
- SINSERT : SEARCH)) == NULL)
- return (RET_ERROR);
-
- h = e->page;
- idx = e->index;
-
- /*
- * Add the specified key/data pair to the tree. The R_IAFTER and
- * R_IBEFORE flags insert the key after/before the specified key.
- *
- * Pages are split as required.
- */
- switch (flags) {
- case R_IAFTER:
- ++idx;
- break;
- case R_IBEFORE:
- break;
- default:
- if (nrec < t->bt_nrecs &&
- __rec_dleaf(t, h, idx) == RET_ERROR) {
- mpool_put(t->bt_mp, h, 0);
- return (RET_ERROR);
- }
- break;
- }
-
- /*
- * If not enough room, split the page. The split code will insert
- * the key and data and unpin the current page. If inserting into
- * the offset array, shift the pointers up.
- */
- nbytes = NRLEAFDBT(data->size);
- if ((u_int32_t) (h->upper - h->lower) < nbytes + sizeof(indx_t)) {
- status = __bt_split(t, h, NULL, data, dflags, nbytes, idx);
- if (status == RET_SUCCESS)
- ++t->bt_nrecs;
- return (status);
- }
-
- if (idx < (nxtindex = NEXTINDEX(h)))
- memmove(h->linp + idx + 1, h->linp + idx,
- (nxtindex - idx) * sizeof(indx_t));
- h->lower += sizeof(indx_t);
-
- h->linp[idx] = h->upper -= nbytes;
- dest = (char *)h + h->upper;
- WR_RLEAF(dest, data, dflags);
-
- ++t->bt_nrecs;
- F_SET(t, B_MODIFIED);
- mpool_put(t->bt_mp, h, MPOOL_DIRTY);
-
- return (RET_SUCCESS);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)rec_search.c 8.4 (Berkeley) 7/14/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <errno.h>
-#include <stdio.h>
-
-#include "../include/db.h"
-#include "recno.h"
-
-/*
- * __REC_SEARCH -- Search a btree for a key.
- *
- * Parameters:
- * t: tree to search
- * recno: key to find
- * op: search operation
- *
- * Returns:
- * EPG for matching record, if any, or the EPG for the location of the
- * key, if it were inserted into the tree.
- *
- * Returns:
- * The EPG for matching record, if any, or the EPG for the location
- * of the key, if it were inserted into the tree, is entered into
- * the bt_cur field of the tree. A pointer to the field is returned.
- */
-EPG *
-__rec_search(t, recno, op)
- BTREE *t;
- recno_t recno;
- enum SRCHOP op;
-{
- register indx_t index;
- register PAGE *h;
- EPGNO *parent;
- RINTERNAL *r;
- pgno_t pg;
- indx_t top;
- recno_t total;
- int sverrno;
-
- BT_CLR(t);
- for (pg = P_ROOT, total = 0;;) {
- if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
- goto err;
- if (h->flags & P_RLEAF) {
- t->bt_cur.page = h;
- t->bt_cur.index = recno - total;
- return (&t->bt_cur);
- }
- for (index = 0, top = NEXTINDEX(h);;) {
- r = GETRINTERNAL(h, index);
- if (++index == top || total + r->nrecs > recno)
- break;
- total += r->nrecs;
- }
-
- BT_PUSH(t, pg, index - 1);
-
- pg = r->pgno;
- switch (op) {
- case SDELETE:
- --GETRINTERNAL(h, (index - 1))->nrecs;
- mpool_put(t->bt_mp, h, MPOOL_DIRTY);
- break;
- case SINSERT:
- ++GETRINTERNAL(h, (index - 1))->nrecs;
- mpool_put(t->bt_mp, h, MPOOL_DIRTY);
- break;
- case SEARCH:
- mpool_put(t->bt_mp, h, 0);
- break;
- }
-
- }
- /* Try and recover the tree. */
-err: sverrno = errno;
- if (op != SEARCH)
- while ((parent = BT_POP(t)) != NULL) {
- if ((h = mpool_get(t->bt_mp, parent->pgno, 0)) == NULL)
- break;
- if (op == SINSERT)
- --GETRINTERNAL(h, parent->index)->nrecs;
- else
- ++GETRINTERNAL(h, parent->index)->nrecs;
- mpool_put(t->bt_mp, h, MPOOL_DIRTY);
- }
- errno = sverrno;
- return (NULL);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1991, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)rec_seq.c 8.3 (Berkeley) 7/14/94";
-#endif /* not lint */
-
-#include <sys/types.h>
-
-#include <errno.h>
-#include <limits.h>
-#include <stdio.h>
-#include <string.h>
-
-#include "../include/db.h"
-#include "recno.h"
-
-/*
- * __REC_SEQ -- Recno sequential scan interface.
- *
- * Parameters:
- * dbp: pointer to access method
- * key: key for positioning and return value
- * data: data return value
- * flags: R_CURSOR, R_FIRST, R_LAST, R_NEXT, R_PREV.
- *
- * Returns:
- * RET_ERROR, RET_SUCCESS or RET_SPECIAL if there's no next key.
- */
-int
-__rec_seq(dbp, key, data, flags)
- const DB *dbp;
- DBT *key, *data;
- u_int flags;
-{
- BTREE *t;
- EPG *e;
- recno_t nrec;
- int status;
-
- t = dbp->internal;
-
- /* Toss any page pinned across calls. */
- if (t->bt_pinned != NULL) {
- mpool_put(t->bt_mp, t->bt_pinned, 0);
- t->bt_pinned = NULL;
- }
-
- switch(flags) {
- case R_CURSOR:
- if ((nrec = *(recno_t *)key->data) == 0)
- goto einval;
- break;
- case R_NEXT:
- if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
- nrec = t->bt_cursor.rcursor + 1;
- break;
- }
- /* FALLTHROUGH */
- case R_FIRST:
- nrec = 1;
- break;
- case R_PREV:
- if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
- if ((nrec = t->bt_cursor.rcursor - 1) == 0)
- return (RET_SPECIAL);
- break;
- }
- /* FALLTHROUGH */
- case R_LAST:
- if (!F_ISSET(t, R_EOF | R_INMEM) &&
- t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
- return (RET_ERROR);
- nrec = t->bt_nrecs;
- break;
- default:
-einval: errno = EINVAL;
- return (RET_ERROR);
- }
-
- if (t->bt_nrecs == 0 || nrec > t->bt_nrecs) {
- if (!F_ISSET(t, R_EOF | R_INMEM) &&
- (status = t->bt_irec(t, nrec)) != RET_SUCCESS)
- return (status);
- if (t->bt_nrecs == 0 || nrec > t->bt_nrecs)
- return (RET_SPECIAL);
- }
-
- if ((e = __rec_search(t, nrec - 1, SEARCH)) == NULL)
- return (RET_ERROR);
-
- F_SET(&t->bt_cursor, CURS_INIT);
- t->bt_cursor.rcursor = nrec;
-
- status = __rec_ret(t, e, nrec, key, data);
- if (F_ISSET(t, B_DB_LOCK))
- mpool_put(t->bt_mp, e->page, 0);
- else
- t->bt_pinned = e->page;
- return (status);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)rec_utils.c 8.6 (Berkeley) 7/16/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/param.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "../include/db.h"
-#include "recno.h"
-
-/*
- * __rec_ret --
- * Build return data.
- *
- * Parameters:
- * t: tree
- * e: key/data pair to be returned
- * nrec: record number
- * key: user's key structure
- * data: user's data structure
- *
- * Returns:
- * RET_SUCCESS, RET_ERROR.
- */
-int
-__rec_ret(t, e, nrec, key, data)
- BTREE *t;
- EPG *e;
- recno_t nrec;
- DBT *key, *data;
-{
- RLEAF *rl;
- void *p;
-
- if (key == NULL)
- goto dataonly;
-
- /* We have to copy the key, it's not on the page. */
- if (sizeof(recno_t) > t->bt_rkey.size) {
- p = (void *)(t->bt_rkey.data == NULL ?
- malloc(sizeof(recno_t)) :
- realloc(t->bt_rkey.data, sizeof(recno_t)));
- if (p == NULL)
- return (RET_ERROR);
- t->bt_rkey.data = p;
- t->bt_rkey.size = sizeof(recno_t);
- }
- memmove(t->bt_rkey.data, &nrec, sizeof(recno_t));
- key->size = sizeof(recno_t);
- key->data = t->bt_rkey.data;
-
-dataonly:
- if (data == NULL)
- return (RET_SUCCESS);
-
- /*
- * We must copy big keys/data to make them contiguous. Otherwise,
- * leave the page pinned and don't copy unless the user specified
- * concurrent access.
- */
- rl = GETRLEAF(e->page, e->index);
- if (rl->flags & P_BIGDATA) {
- if (__ovfl_get(t, rl->bytes,
- &data->size, &t->bt_rdata.data, &t->bt_rdata.size))
- return (RET_ERROR);
- data->data = t->bt_rdata.data;
- } else if (F_ISSET(t, B_DB_LOCK)) {
- /* Use +1 in case the first record retrieved is 0 length. */
- if (rl->dsize + 1 > t->bt_rdata.size) {
- p = (void *)(t->bt_rdata.data == NULL ?
- malloc(rl->dsize + 1) :
- realloc(t->bt_rdata.data, rl->dsize + 1));
- if (p == NULL)
- return (RET_ERROR);
- t->bt_rdata.data = p;
- t->bt_rdata.size = rl->dsize + 1;
- }
- memmove(t->bt_rdata.data, rl->bytes, rl->dsize);
- data->size = rl->dsize;
- data->data = t->bt_rdata.data;
- } else {
- data->size = rl->dsize;
- data->data = rl->bytes;
- }
- return (RET_SUCCESS);
-}
+++ /dev/null
-/*-
- * Copyright (c) 1991, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)recno.h 8.1 (Berkeley) 6/4/93
- */
-
-enum SRCHOP { SDELETE, SINSERT, SEARCH}; /* Rec_search operation. */
-
-#include "../btree/btree.h"
-#include "extern.h"
<defaultenabled>yes</defaultenabled>
<support_level>core</support_level>
</member>
- <member name="astdb2sqlite3">
- <defaultenabled>yes</defaultenabled>
- <support_level>core</support_level>
- </member>
- <member name="astdb2bdb">
- <defaultenabled>yes</defaultenabled>
- <support_level>core</support_level>
- </member>
<member name="astman">
<defaultenabled>no</defaultenabled>
<depend>newt</depend>
projects / thirdparty / asterisk.git / commitdiff
