--- /dev/null
+/* tempname.c - generate the name of a temporary file.
+
+ Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
+ 2000, 2001, 2002, 2003, 2005, 2006, 2007 Free Software Foundation,
+ Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+/* Extracted from glibc sysdeps/posix/tempname.c. See also tmpdir.c. */
+
+#if !_LIBC
+# include <config.h>
+# include "tempname.h"
+#endif
+
+#include <sys/types.h>
+#include <assert.h>
+
+#include <errno.h>
+#ifndef __set_errno
+# define __set_errno(Val) errno = (Val)
+#endif
+
+#include <stdio.h>
+#ifndef P_tmpdir
+# define P_tmpdir "/tmp"
+#endif
+#ifndef TMP_MAX
+# define TMP_MAX 238328
+#endif
+#ifndef __GT_FILE
+# define __GT_FILE 0
+# define __GT_BIGFILE 1
+# define __GT_DIR 2
+# define __GT_NOCREATE 3
+#endif
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <fcntl.h>
+#include <sys/time.h>
+#include <stdint.h>
+#include <unistd.h>
+
+#include <sys/stat.h>
+
+#if _LIBC
+# define struct_stat64 struct stat64
+# define small_open __open
+# define large_open __open64
+#else
+# define struct_stat64 struct stat
+# define small_open open
+# define large_open open
+# define __gen_tempname gen_tempname
+# define __getpid getpid
+# define __gettimeofday gettimeofday
+# define __mkdir mkdir
+# define __lxstat64(version, file, buf) lstat (file, buf)
+# define __xstat64(version, file, buf) stat (file, buf)
+#endif
+
+#if ! (HAVE___SECURE_GETENV || _LIBC)
+# define __secure_getenv getenv
+#endif
+
+#ifdef _LIBC
+# include <hp-timing.h>
+# if HP_TIMING_AVAIL
+# define RANDOM_BITS(Var) \
+ if (__builtin_expect (value == UINT64_C (0), 0)) \
+ { \
+ /* If this is the first time this function is used initialize \
+ the variable we accumulate the value in to some somewhat \
+ random value. If we'd not do this programs at startup time \
+ might have a reduced set of possible names, at least on slow \
+ machines. */ \
+ struct timeval tv; \
+ __gettimeofday (&tv, NULL); \
+ value = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec; \
+ } \
+ HP_TIMING_NOW (Var)
+# endif
+#endif
+
+/* Use the widest available unsigned type if uint64_t is not
+ available. The algorithm below extracts a number less than 62**6
+ (approximately 2**35.725) from uint64_t, so ancient hosts where
+ uintmax_t is only 32 bits lose about 3.725 bits of randomness,
+ which is better than not having mkstemp at all. */
+#if !defined UINT64_MAX && !defined uint64_t
+# define uint64_t uintmax_t
+#endif
+
+#if _LIBC
+/* Return nonzero if DIR is an existent directory. */
+static int
+direxists (const char *dir)
+{
+ struct_stat64 buf;
+ return __xstat64 (_STAT_VER, dir, &buf) == 0 && S_ISDIR (buf.st_mode);
+}
+
+/* Path search algorithm, for tmpnam, tmpfile, etc. If DIR is
+ non-null and exists, uses it; otherwise uses the first of $TMPDIR,
+ P_tmpdir, /tmp that exists. Copies into TMPL a template suitable
+ for use with mk[s]temp. Will fail (-1) if DIR is non-null and
+ doesn't exist, none of the searched dirs exists, or there's not
+ enough space in TMPL. */
+int
+__path_search (char *tmpl, size_t tmpl_len, const char *dir, const char *pfx,
+ int try_tmpdir)
+{
+ const char *d;
+ size_t dlen, plen;
+
+ if (!pfx || !pfx[0])
+ {
+ pfx = "file";
+ plen = 4;
+ }
+ else
+ {
+ plen = strlen (pfx);
+ if (plen > 5)
+ plen = 5;
+ }
+
+ if (try_tmpdir)
+ {
+ d = __secure_getenv ("TMPDIR");
+ if (d != NULL && direxists (d))
+ dir = d;
+ else if (dir != NULL && direxists (dir))
+ /* nothing */ ;
+ else
+ dir = NULL;
+ }
+ if (dir == NULL)
+ {
+ if (direxists (P_tmpdir))
+ dir = P_tmpdir;
+ else if (strcmp (P_tmpdir, "/tmp") != 0 && direxists ("/tmp"))
+ dir = "/tmp";
+ else
+ {
+ __set_errno (ENOENT);
+ return -1;
+ }
+ }
+
+ dlen = strlen (dir);
+ while (dlen > 1 && dir[dlen - 1] == '/')
+ dlen--; /* remove trailing slashes */
+
+ /* check we have room for "${dir}/${pfx}XXXXXX\0" */
+ if (tmpl_len < dlen + 1 + plen + 6 + 1)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ sprintf (tmpl, "%.*s/%.*sXXXXXX", (int) dlen, dir, (int) plen, pfx);
+ return 0;
+}
+#endif /* _LIBC */
+
+/* These are the characters used in temporary file names. */
+static const char letters[] =
+"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+
+/* Generate a temporary file name based on TMPL. TMPL must match the
+ rules for mk[s]temp (i.e. end in "XXXXXX"). The name constructed
+ does not exist at the time of the call to __gen_tempname. TMPL is
+ overwritten with the result.
+
+ KIND may be one of:
+ __GT_NOCREATE: simply verify that the name does not exist
+ at the time of the call.
+ __GT_FILE: create the file using open(O_CREAT|O_EXCL)
+ and return a read-write fd. The file is mode 0600.
+ __GT_BIGFILE: same as __GT_FILE but use open64().
+ __GT_DIR: create a directory, which will be mode 0700.
+
+ We use a clever algorithm to get hard-to-predict names. */
+int
+__gen_tempname (char *tmpl, int kind)
+{
+ int len;
+ char *XXXXXX;
+ static uint64_t value;
+ uint64_t random_time_bits;
+ unsigned int count;
+ int fd = -1;
+ int save_errno = errno;
+ struct_stat64 st;
+
+ /* A lower bound on the number of temporary files to attempt to
+ generate. The maximum total number of temporary file names that
+ can exist for a given template is 62**6. It should never be
+ necessary to try all these combinations. Instead if a reasonable
+ number of names is tried (we define reasonable as 62**3) fail to
+ give the system administrator the chance to remove the problems. */
+#define ATTEMPTS_MIN (62 * 62 * 62)
+
+ /* The number of times to attempt to generate a temporary file. To
+ conform to POSIX, this must be no smaller than TMP_MAX. */
+#if ATTEMPTS_MIN < TMP_MAX
+ unsigned int attempts = TMP_MAX;
+#else
+ unsigned int attempts = ATTEMPTS_MIN;
+#endif
+
+ len = strlen (tmpl);
+ if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX"))
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ /* This is where the Xs start. */
+ XXXXXX = &tmpl[len - 6];
+
+ /* Get some more or less random data. */
+#ifdef RANDOM_BITS
+ RANDOM_BITS (random_time_bits);
+#else
+ {
+ struct timeval tv;
+ __gettimeofday (&tv, NULL);
+ random_time_bits = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec;
+ }
+#endif
+ value += random_time_bits ^ __getpid ();
+
+ for (count = 0; count < attempts; value += 7777, ++count)
+ {
+ uint64_t v = value;
+
+ /* Fill in the random bits. */
+ XXXXXX[0] = letters[v % 62];
+ v /= 62;
+ XXXXXX[1] = letters[v % 62];
+ v /= 62;
+ XXXXXX[2] = letters[v % 62];
+ v /= 62;
+ XXXXXX[3] = letters[v % 62];
+ v /= 62;
+ XXXXXX[4] = letters[v % 62];
+ v /= 62;
+ XXXXXX[5] = letters[v % 62];
+
+ switch (kind)
+ {
+ case __GT_FILE:
+ fd = small_open (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
+ break;
+
+ case __GT_BIGFILE:
+ fd = large_open (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
+ break;
+
+ case __GT_DIR:
+ fd = __mkdir (tmpl, S_IRUSR | S_IWUSR | S_IXUSR);
+ break;
+
+ case __GT_NOCREATE:
+ /* This case is backward from the other three. __gen_tempname
+ succeeds if __xstat fails because the name does not exist.
+ Note the continue to bypass the common logic at the bottom
+ of the loop. */
+ if (__lxstat64 (_STAT_VER, tmpl, &st) < 0)
+ {
+ if (errno == ENOENT)
+ {
+ __set_errno (save_errno);
+ return 0;
+ }
+ else
+ /* Give up now. */
+ return -1;
+ }
+ continue;
+
+ default:
+ assert (! "invalid KIND in __gen_tempname");
+ }
+
+ if (fd >= 0)
+ {
+ __set_errno (save_errno);
+ return fd;
+ }
+ else if (errno != EEXIST)
+ return -1;
+ }
+
+ /* We got out of the loop because we ran out of combinations to try. */
+ __set_errno (EEXIST);
+ return -1;
+}
--- /dev/null
+/* Create a temporary file or directory.
+
+ Copyright (C) 2006 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+/* header written by Eric Blake */
+
+/* In gnulib, always prefer large files. GT_FILE maps to
+ __GT_BIGFILE, not __GT_FILE, for a reason. */
+#define GT_FILE 1
+#define GT_DIR 2
+#define GT_NOCREATE 3
+
+/* Generate a temporary file name based on TMPL. TMPL must match the
+ rules for mk[s]temp (i.e. end in "XXXXXX"). The name constructed
+ does not exist at the time of the call to gen_tempname. TMPL is
+ overwritten with the result.
+
+ KIND may be one of:
+ GT_NOCREATE: simply verify that the name does not exist
+ at the time of the call.
+ GT_FILE: create a large file using open(O_CREAT|O_EXCL)
+ and return a read-write fd. The file is mode 0600.
+ GT_DIR: create a directory, which will be mode 0700.
+
+ We use a clever algorithm to get hard-to-predict names. */
+extern int gen_tempname (char *tmpl, int kind);
projects / thirdparty / coreutils.git / commitdiff
