nptl/Makefile
For b/14616463, add -fno-function-sections to events.c compilation.
(bmoses, google-local)
+
+libio/Makefile
+libio/fileops.c
+libio/iofdopen.c
+libio/iofwide.c
+libio/libioP.h
+libio/tst-ftell-active-handler.c
+libio/wfileops.c
+ For b/15017950, backport upstream patches for PR16532 (separate
+ ftell, fseek logic) and subsequent optimization and cleanup:
+ https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=000232b9bcbf194f1e5fd0ff380000f341505405
+ https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=fa3cd24827d34a49e0a3a5cac56abbf8df74d8ac
+ https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=091eff71a5edacb5a321c6e573f09a5358540675
+ https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=d4b17258bba38f206079fbae1e7255779db1b74c
+ (bmoses, already upstream)
tst-wmemstream1 tst-wmemstream2 \
bug-memstream1 bug-wmemstream1 \
tst-setvbuf1 tst-popen1 tst-fgetwc bug-wsetpos tst-fseek \
- tst-fwrite-error tst-ftell-partial-wide
+ tst-fwrite-error tst-ftell-partial-wide tst-ftell-active-handler
ifeq (yes,$(build-shared))
# Add test-fopenloc only if shared library is enabled since it depends on
# shared localedata objects.
return 0;
}
+/* Get the current file offset using a system call. This is the safest method
+ to get the current file offset, since we are sure that we get the current
+ state of the file. Before the stream handle is activated (by using fread,
+ fwrite, etc.), an application may alter the state of the file descriptor
+ underlying it by calling read/write/lseek on it. Using a cached offset at
+ this point will result in returning the incorrect value. Same is the case
+ when one switches from reading in a+ mode to writing, where the buffer has
+ not been flushed - the cached offset would reflect the reading position
+ while the actual write position would be at the end of the file.
+
+ do_ftell and do_ftell_wide may resort to using the cached offset in some
+ special cases instead of calling get_file_offset, but those cases should be
+ thoroughly described. */
+_IO_off64_t
+get_file_offset (_IO_FILE *fp)
+{
+ if ((fp->_flags & _IO_IS_APPENDING) == _IO_IS_APPENDING)
+ {
+ struct stat64 st;
+ bool ret = (_IO_SYSSTAT (fp, &st) == 0 && S_ISREG (st.st_mode));
+ if (ret)
+ return st.st_size;
+ else
+ return EOF;
+ }
+ else
+ return _IO_SYSSEEK (fp, 0, _IO_seek_cur);
+}
+
+
+/* ftell{,o} implementation. Don't modify any state of the file pointer while
+ we try to get the current state of the stream. */
+static _IO_off64_t
+do_ftell (_IO_FILE *fp)
+{
+ _IO_off64_t result = 0;
+ bool use_cached_offset = false;
+
+ /* No point looking at unflushed data if we haven't allocated buffers
+ yet. */
+ if (fp->_IO_buf_base != NULL)
+ {
+ bool was_writing = (fp->_IO_write_ptr > fp->_IO_write_base
+ || _IO_in_put_mode (fp));
+
+ /* Adjust for unflushed data. */
+ if (!was_writing)
+ result -= fp->_IO_read_end - fp->_IO_read_ptr;
+ else
+ result += fp->_IO_write_ptr - fp->_IO_read_end;
+
+ /* It is safe to use the cached offset when available if there is
+ unbuffered data (indicating that the file handle is active) and the
+ handle is not for a file open in a+ mode. The latter condition is
+ because there could be a scenario where there is a switch from read
+ mode to write mode using an fseek to an arbitrary position. In this
+ case, there would be unbuffered data due to be appended to the end of
+ the file, but the offset may not necessarily be the end of the
+ file. It is fine to use the cached offset when the a+ stream is in
+ read mode though, since the offset is maintained correctly in that
+ case. Note that this is not a comprehensive set of cases when the
+ offset is reliable. The offset may be reliable even in some cases
+ where there is no unflushed input and the handle is active, but it's
+ just that we don't have a way to identify that condition reliably. */
+ use_cached_offset = (result != 0 && fp->_offset != _IO_pos_BAD
+ && ((fp->_flags & (_IO_IS_APPENDING | _IO_NO_READS))
+ == (_IO_IS_APPENDING | _IO_NO_READS)
+ && was_writing));
+ }
+
+ if (use_cached_offset)
+ result += fp->_offset;
+ else
+ result += get_file_offset (fp);
+
+ if (result == EOF)
+ return result;
+
+ if (result < 0)
+ {
+ __set_errno (EINVAL);
+ return EOF;
+ }
+
+ return result;
+}
+
_IO_off64_t
_IO_new_file_seekoff (fp, offset, dir, mode)
_IO_off64_t result;
_IO_off64_t delta, new_offset;
long count;
+
+ /* Short-circuit into a separate function. We don't want to mix any
+ functionality and we don't want to touch anything inside the FILE
+ object. */
+ if (mode == 0)
+ return do_ftell (fp);
+
/* POSIX.1 8.2.3.7 says that after a call the fflush() the file
offset of the underlying file must be exact. */
int must_be_exact = (fp->_IO_read_base == fp->_IO_read_end
bool was_writing = (fp->_IO_write_ptr > fp->_IO_write_base
|| _IO_in_put_mode (fp));
- if (mode == 0)
- dir = _IO_seek_cur, offset = 0; /* Don't move any pointers. */
-
/* Flush unwritten characters.
(This may do an unneeded write if we seek within the buffer.
But to be able to switch to reading, we would need to set
which assumes file_ptr() is eGptr. Anyway, since we probably
end up flushing when we close(), it doesn't make much difference.)
FIXME: simulate mem-mapped files. */
- else if (was_writing && _IO_switch_to_get_mode (fp))
+ if (was_writing && _IO_switch_to_get_mode (fp))
return EOF;
if (fp->_IO_buf_base == NULL)
{
case _IO_seek_cur:
/* Adjust for read-ahead (bytes is buffer). */
- if (mode != 0 || !was_writing)
- offset -= fp->_IO_read_end - fp->_IO_read_ptr;
- else
- {
- /* _IO_read_end coincides with fp._offset, so the actual file position
- is fp._offset - (_IO_read_end - new_write_ptr). This is fine
- even if fp._offset is not set, since fp->_IO_read_end is then at
- _IO_buf_base and this adjustment is for unbuffered output. */
- offset -= fp->_IO_read_end - fp->_IO_write_ptr;
- }
+ offset -= fp->_IO_read_end - fp->_IO_read_ptr;
if (fp->_offset == _IO_pos_BAD)
- {
- if (mode != 0)
- goto dumb;
- else
- {
- result = _IO_SYSSEEK (fp, 0, dir);
- if (result == EOF)
- return result;
-
- fp->_offset = result;
- }
- }
+ goto dumb;
/* Make offset absolute, assuming current pointer is file_ptr(). */
offset += fp->_offset;
if (offset < 0)
}
/* At this point, dir==_IO_seek_set. */
- /* If we are only interested in the current position we've found it now. */
- if (mode == 0)
- return offset;
-
/* If destination is within current buffer, optimize: */
if (fp->_offset != _IO_pos_BAD && fp->_IO_read_base != NULL
&& !_IO_in_backup (fp))
#ifdef _IO_MTSAFE_IO
new_f->fp.file._lock = &new_f->lock;
#endif
- /* Set up initially to use the `maybe_mmap' jump tables rather than using
- __fopen_maybe_mmap to do it, because we need them in place before we
- call _IO_file_attach or else it will allocate a buffer immediately. */
_IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd,
#ifdef _G_HAVE_MMAP
(use_mmap && (read_write & _IO_NO_WRITES))
#if !_IO_UNIFIED_JUMPTABLES
new_f->fp.vtable = NULL;
#endif
- if (_IO_file_attach ((_IO_FILE *) &new_f->fp, fd) == NULL)
- {
- _IO_setb (&new_f->fp.file, NULL, NULL, 0);
- _IO_un_link (&new_f->fp);
- free (new_f);
- return NULL;
- }
+ /* We only need to record the fd because _IO_file_init will have unset the
+ offset. It is important to unset the cached offset because the real
+ offset in the file could change between now and when the handle is
+ activated and we would then mislead ftell into believing that we have a
+ valid offset. */
+ new_f->fp.file._fileno = fd;
new_f->fp.file._flags &= ~_IO_DELETE_DONT_CLOSE;
_IO_mask_flags (&new_f->fp.file, read_write,
/* From now on use the wide character callback functions. */
((struct _IO_FILE_plus *) fp)->vtable = fp->_wide_data->_wide_vtable;
-
- /* One last twist: we get the current stream position. The wide
- char streams have much more problems with not knowing the
- current position and so we should disable the optimization
- which allows the functions without knowing the position. */
- fp->_offset = _IO_SYSSEEK (fp, 0, _IO_seek_cur);
}
/* Set the mode now. */
libc_hidden_proto (_IO_wdoallocbuf)
extern void _IO_unsave_wmarkers (_IO_FILE *) __THROW;
extern unsigned _IO_adjust_wcolumn (unsigned, const wchar_t *, int) __THROW;
+extern _IO_off64_t get_file_offset (_IO_FILE *fp);
/* Marker-related function. */
--- /dev/null
+/* Verify that ftell returns the correct value at various points before and
+ after the handler on which it is called becomes active.
+ Copyright (C) 2014 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <locale.h>
+#include <wchar.h>
+
+static int do_test (void);
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
+
+#define get_handles_fdopen(filename, fd, fp, fd_mode, mode) \
+({ \
+ int ret = 0; \
+ (fd) = open ((filename), (fd_mode), 0); \
+ if ((fd) == -1) \
+ { \
+ printf ("open failed: %m\n"); \
+ ret = 1; \
+ } \
+ else \
+ { \
+ (fp) = fdopen ((fd), (mode)); \
+ if ((fp) == NULL) \
+ { \
+ printf ("fdopen failed: %m\n"); \
+ close (fd); \
+ ret = 1; \
+ } \
+ } \
+ ret; \
+})
+
+#define get_handles_fopen(filename, fd, fp, mode) \
+({ \
+ int ret = 0; \
+ (fp) = fopen ((filename), (mode)); \
+ if ((fp) == NULL) \
+ { \
+ printf ("fopen failed: %m\n"); \
+ ret = 1; \
+ } \
+ else \
+ { \
+ (fd) = fileno (fp); \
+ if ((fd) == -1) \
+ { \
+ printf ("fileno failed: %m\n"); \
+ ret = 1; \
+ } \
+ } \
+ ret; \
+})
+
+/* data points to either char_data or wide_data, depending on whether we're
+ testing regular file mode or wide mode respectively. Similarly,
+ fputs_func points to either fputs or fputws. data_len keeps track of the
+ length of the current data and file_len maintains the current file
+ length. */
+static const void *data;
+static const char *char_data = "abcdef";
+static const wchar_t *wide_data = L"abcdef";
+static size_t data_len;
+static size_t file_len;
+
+typedef int (*fputs_func_t) (const void *data, FILE *fp);
+fputs_func_t fputs_func;
+
+/* Test that the value of ftell is not cached when the stream handle is not
+ active. */
+static int
+do_ftell_test (const char *filename)
+{
+ int ret = 0;
+ struct test
+ {
+ const char *mode;
+ int fd_mode;
+ size_t old_off;
+ size_t new_off;
+ } test_modes[] = {
+ /* In w, w+ and r+ modes, the file position should be at the
+ beginning of the file. After the write, the offset should be
+ updated to data_len. */
+ {"w", O_WRONLY, 0, data_len},
+ {"w+", O_RDWR, 0, data_len},
+ {"r+", O_RDWR, 0, data_len},
+ /* For 'a' and 'a+' modes, the initial file position should be the
+ current end of file. After the write, the offset has data_len
+ added to the old value. */
+ {"a", O_WRONLY, data_len, 2 * data_len},
+ {"a+", O_RDWR, 2 * data_len, 3 * data_len},
+ };
+ for (int j = 0; j < 2; j++)
+ {
+ for (int i = 0; i < sizeof (test_modes) / sizeof (struct test); i++)
+ {
+ FILE *fp;
+ int fd;
+ printf ("\tftell: %s (file, \"%s\"): ", j == 0 ? "fdopen" : "fopen",
+ test_modes[i].mode);
+
+ if (j == 0)
+ ret = get_handles_fdopen (filename, fd, fp, test_modes[i].fd_mode,
+ test_modes[i].mode);
+ else
+ ret = get_handles_fopen (filename, fd, fp, test_modes[i].mode);
+
+ if (ret != 0)
+ return ret;
+
+ long off = ftell (fp);
+ if (off != test_modes[i].old_off)
+ {
+ printf ("Incorrect old offset. Expected %zu but got %ld, ",
+ test_modes[i].old_off, off);
+ ret |= 1;
+ }
+ else
+ printf ("old offset = %ld, ", off);
+
+ /* The effect of this write on the offset should be seen in the ftell
+ call that follows it. */
+ int ret = write (fd, data, data_len);
+ off = ftell (fp);
+
+ if (off != test_modes[i].new_off)
+ {
+ printf ("Incorrect new offset. Expected %zu but got %ld\n",
+ test_modes[i].old_off, off);
+ ret |= 1;
+ }
+ else
+ printf ("new offset = %ld\n", off);
+
+ fclose (fp);
+ }
+ }
+
+ return ret;
+}
+
+/* This test opens the file for writing, moves the file offset of the
+ underlying file, writes out data and then checks if ftell trips on it. */
+static int
+do_write_test (const char *filename)
+{
+ FILE *fp = NULL;
+ int fd;
+ int ret = 0;
+ struct test
+ {
+ const char *mode;
+ int fd_mode;
+ } test_modes[] = {
+ {"w", O_WRONLY},
+ {"w+", O_RDWR},
+ {"r+", O_RDWR}
+ };
+
+ for (int j = 0; j < 2; j++)
+ {
+ for (int i = 0; i < sizeof (test_modes) / sizeof (struct test); i++)
+ {
+ printf ("\twrite: %s (file, \"%s\"): ", j == 0 ? "fopen" : "fdopen",
+ test_modes[i].mode);
+
+ if (j == 0)
+ ret = get_handles_fopen (filename, fd, fp, test_modes[i].mode);
+ else
+ ret = get_handles_fdopen (filename, fd, fp, test_modes[i].fd_mode,
+ test_modes[i].mode);
+
+ if (ret != 0)
+ return ret;
+
+ /* Move offset to just before the end of the file. */
+ off_t ret = lseek (fd, file_len - 1, SEEK_SET);
+ if (ret == -1)
+ {
+ printf ("lseek failed: %m\n");
+ ret |= 1;
+ }
+
+ /* Write some data. */
+ size_t written = fputs_func (data, fp);
+
+ if (written == EOF)
+ {
+ printf ("fputs[1] failed to write data\n");
+ ret |= 1;
+ }
+
+ /* Verify that the offset points to the end of the file. The length
+ of the file would be the original length + the length of data
+ written to it - the amount by which we moved the offset using
+ lseek. */
+ long offset = ftell (fp);
+ file_len = file_len - 1 + data_len;
+
+ if (offset != file_len)
+ {
+ printf ("Incorrect offset. Expected %zu, but got %ld\n",
+ file_len, offset);
+
+ ret |= 1;
+ }
+
+ printf ("offset = %ld\n", offset);
+ fclose (fp);
+ }
+ }
+
+ return ret;
+}
+
+/* This test opens a file in append mode, writes some data, and then verifies
+ that ftell does not trip over it. */
+static int
+do_append_test (const char *filename)
+{
+ FILE *fp = NULL;
+ int ret = 0;
+ int fd;
+
+ struct test
+ {
+ const char *mode;
+ int fd_mode;
+ } test_modes[] = {
+ {"a", O_WRONLY},
+ {"a+", O_RDWR}
+ };
+
+ for (int j = 0; j < 2; j++)
+ {
+ for (int i = 0; i < sizeof (test_modes) / sizeof (struct test); i++)
+ {
+ printf ("\tappend: %s (file, \"%s\"): ", j == 0 ? "fopen" : "fdopen",
+ test_modes[i].mode);
+
+ if (j == 0)
+ ret = get_handles_fopen (filename, fd, fp, test_modes[i].mode);
+ else
+ ret = get_handles_fdopen (filename, fd, fp, test_modes[i].fd_mode,
+ test_modes[i].mode);
+
+ if (ret != 0)
+ return ret;
+
+ /* Write some data. */
+ size_t written = fputs_func (data, fp);
+
+ if (written == EOF)
+ {
+ printf ("fputs[1] failed to write all data\n");
+ ret |= 1;
+ }
+
+ /* Verify that the offset points to the end of the file. The file
+ len is maintained by adding data_len each time to reflect the data
+ written to it. */
+ long offset = ftell (fp);
+ file_len += data_len;
+
+ if (offset != file_len)
+ {
+ printf ("Incorrect offset. Expected %zu, but got %ld\n",
+ file_len, offset);
+
+ ret |= 1;
+ }
+
+ printf ("offset = %ld\n", offset);
+ fclose (fp);
+ }
+ }
+
+ return ret;
+}
+
+static int
+do_one_test (const char *filename)
+{
+ int ret = 0;
+
+ ret |= do_ftell_test (filename);
+ ret |= do_write_test (filename);
+ ret |= do_append_test (filename);
+
+ return ret;
+}
+
+/* Run a set of tests for ftell for regular files and wide mode files. */
+static int
+do_test (void)
+{
+ int ret = 0;
+ FILE *fp = NULL;
+ char *filename;
+ size_t written;
+ int fd = create_temp_file ("tst-active-handler-tmp.", &filename);
+
+ if (fd == -1)
+ {
+ printf ("create_temp_file: %m\n");
+ return 1;
+ }
+
+ fp = fdopen (fd, "w");
+ if (fp == NULL)
+ {
+ printf ("fdopen[0]: %m\n");
+ close (fd);
+ return 1;
+ }
+
+ data = char_data;
+ data_len = strlen (char_data);
+ file_len = strlen (char_data);
+ written = fputs (data, fp);
+
+ if (written == EOF)
+ {
+ printf ("fputs[1] failed to write data\n");
+ ret = 1;
+ }
+
+ fclose (fp);
+ if (ret)
+ return ret;
+
+ /* Tests for regular files. */
+ puts ("Regular mode:");
+ fputs_func = (fputs_func_t) fputs;
+ data = char_data;
+ data_len = strlen (char_data);
+ ret |= do_one_test (filename);
+
+ /* Truncate the file before repeating the tests in wide mode. */
+ fp = fopen (filename, "w");
+ if (fp == NULL)
+ {
+ printf ("fopen failed %m\n");
+ return 1;
+ }
+ fclose (fp);
+
+ /* Tests for wide files. */
+ puts ("Wide mode:");
+ if (setlocale (LC_ALL, "en_US.UTF-8") == NULL)
+ {
+ printf ("Cannot set en_US.UTF-8 locale.\n");
+ return 1;
+ }
+ fputs_func = (fputs_func_t) fputws;
+ data = wide_data;
+ data_len = wcslen (wide_data);
+ ret |= do_one_test (filename);
+
+ return ret;
+}
return 0;
}
-_IO_off64_t
-_IO_wfile_seekoff (fp, offset, dir, mode)
- _IO_FILE *fp;
- _IO_off64_t offset;
- int dir;
- int mode;
+/* ftell{,o} implementation for wide mode. Don't modify any state of the file
+ pointer while we try to get the current state of the stream. */
+static _IO_off64_t
+do_ftell_wide (_IO_FILE *fp)
{
- _IO_off64_t result;
- _IO_off64_t delta, new_offset;
- long int count;
- /* POSIX.1 8.2.3.7 says that after a call the fflush() the file
- offset of the underlying file must be exact. */
- int must_be_exact = ((fp->_wide_data->_IO_read_base
- == fp->_wide_data->_IO_read_end)
- && (fp->_wide_data->_IO_write_base
- == fp->_wide_data->_IO_write_ptr));
+ _IO_off64_t result, offset = 0;
+ bool use_cached_offset = false;
- bool was_writing = ((fp->_wide_data->_IO_write_ptr
- > fp->_wide_data->_IO_write_base)
- || _IO_in_put_mode (fp));
-
- if (mode == 0)
+ /* No point looking for offsets in the buffer if it hasn't even been
+ allocated. */
+ if (fp->_wide_data->_IO_buf_base != NULL)
{
+ const wchar_t *wide_read_base;
+ const wchar_t *wide_read_ptr;
+ const wchar_t *wide_read_end;
+ bool was_writing = ((fp->_wide_data->_IO_write_ptr
+ > fp->_wide_data->_IO_write_base)
+ || _IO_in_put_mode (fp));
+
/* XXX For wide stream with backup store it is not very
reasonable to determine the offset. The pushed-back
character might require a state change and we need not be
return -1;
}
- /* There is no more data in the backup buffer. We can
- switch back. */
- _IO_switch_to_main_wget_area (fp);
+ /* Nothing in the backup store, so note the backed up pointers
+ without changing the state. */
+ wide_read_base = fp->_wide_data->_IO_save_base;
+ wide_read_ptr = wide_read_base;
+ wide_read_end = fp->_wide_data->_IO_save_end;
+ }
+ else
+ {
+ wide_read_base = fp->_wide_data->_IO_read_base;
+ wide_read_ptr = fp->_wide_data->_IO_read_ptr;
+ wide_read_end = fp->_wide_data->_IO_read_end;
+ }
+
+ struct _IO_codecvt *cv = fp->_codecvt;
+ int clen = (*cv->__codecvt_do_encoding) (cv);
+
+ if (!was_writing)
+ {
+ if (clen > 0)
+ {
+ offset -= (wide_read_end - wide_read_ptr) * clen;
+ offset -= fp->_IO_read_end - fp->_IO_read_ptr;
+ }
+ else
+ {
+ int nread;
+
+ size_t delta = wide_read_ptr - wide_read_base;
+ __mbstate_t state = fp->_wide_data->_IO_last_state;
+ nread = (*cv->__codecvt_do_length) (cv, &state,
+ fp->_IO_read_base,
+ fp->_IO_read_end, delta);
+ offset -= fp->_IO_read_end - fp->_IO_read_base - nread;
+ }
+ }
+ else
+ {
+ if (clen > 0)
+ offset += (fp->_wide_data->_IO_write_ptr
+ - fp->_wide_data->_IO_write_base) * clen;
+ else
+ {
+ size_t delta = (fp->_wide_data->_IO_write_ptr
+ - fp->_wide_data->_IO_write_base);
+
+ /* Allocate enough space for the conversion. */
+ size_t outsize = delta * sizeof (wchar_t);
+ char *out = malloc (outsize);
+ char *outstop = out;
+ const wchar_t *in = fp->_wide_data->_IO_write_base;
+
+ enum __codecvt_result status;
+
+ __mbstate_t state = fp->_wide_data->_IO_last_state;
+ status = (*cv->__codecvt_do_out) (cv, &state,
+ in, in + delta, &in,
+ out, out + outsize, &outstop);
+
+ /* We don't check for __codecvt_partial because it can be
+ returned on one of two conditions: either the output
+ buffer is full or the input sequence is incomplete. We
+ take care to allocate enough buffer and our input
+ sequences must be complete since they are accepted as
+ wchar_t; if not, then that is an error. */
+ if (__glibc_unlikely (status != __codecvt_ok))
+ return WEOF;
+
+ offset += outstop - out;
+ }
+
+ /* _IO_read_end coincides with fp._offset, so the actual file
+ position is fp._offset - (_IO_read_end - new_write_ptr). */
+ offset -= fp->_IO_read_end - fp->_IO_write_ptr;
}
- dir = _IO_seek_cur, offset = 0; /* Don't move any pointers. */
+ /* It is safe to use the cached offset when available if there is
+ unbuffered data (indicating that the file handle is active) and
+ the handle is not for a file open in a+ mode. The latter
+ condition is because there could be a scenario where there is a
+ switch from read mode to write mode using an fseek to an arbitrary
+ position. In this case, there would be unbuffered data due to be
+ appended to the end of the file, but the offset may not
+ necessarily be the end of the file. It is fine to use the cached
+ offset when the a+ stream is in read mode though, since the offset
+ is maintained correctly in that case. Note that this is not a
+ comprehensive set of cases when the offset is reliable. The
+ offset may be reliable even in some cases where there is no
+ unflushed input and the handle is active, but it's just that we
+ don't have a way to identify that condition reliably. */
+ use_cached_offset = (offset != 0 && fp->_offset != _IO_pos_BAD
+ && ((fp->_flags & (_IO_IS_APPENDING | _IO_NO_READS))
+ == (_IO_IS_APPENDING | _IO_NO_READS)
+ && was_writing));
}
+ if (use_cached_offset)
+ result = fp->_offset;
+ else
+ result = get_file_offset (fp);
+
+ if (result == EOF)
+ return result;
+
+ result += offset;
+
+ return result;
+}
+
+_IO_off64_t
+_IO_wfile_seekoff (fp, offset, dir, mode)
+ _IO_FILE *fp;
+ _IO_off64_t offset;
+ int dir;
+ int mode;
+{
+ _IO_off64_t result;
+ _IO_off64_t delta, new_offset;
+ long int count;
+
+ /* Short-circuit into a separate function. We don't want to mix any
+ functionality and we don't want to touch anything inside the FILE
+ object. */
+ if (mode == 0)
+ return do_ftell_wide (fp);
+
+ /* POSIX.1 8.2.3.7 says that after a call the fflush() the file
+ offset of the underlying file must be exact. */
+ int must_be_exact = ((fp->_wide_data->_IO_read_base
+ == fp->_wide_data->_IO_read_end)
+ && (fp->_wide_data->_IO_write_base
+ == fp->_wide_data->_IO_write_ptr));
+
+ bool was_writing = ((fp->_wide_data->_IO_write_ptr
+ > fp->_wide_data->_IO_write_base)
+ || _IO_in_put_mode (fp));
+
/* Flush unwritten characters.
(This may do an unneeded write if we seek within the buffer.
But to be able to switch to reading, we would need to set
which assumes file_ptr() is eGptr. Anyway, since we probably
end up flushing when we close(), it doesn't make much difference.)
FIXME: simulate mem-mapped files. */
- else if (was_writing && _IO_switch_to_wget_mode (fp))
+ if (was_writing && _IO_switch_to_wget_mode (fp))
return WEOF;
if (fp->_wide_data->_IO_buf_base == NULL)
{
int nread;
- flushed:
delta = (fp->_wide_data->_IO_read_ptr
- fp->_wide_data->_IO_read_base);
fp->_wide_data->_IO_state = fp->_wide_data->_IO_last_state;
offset -= fp->_IO_read_end - fp->_IO_read_base - nread;
}
}
- else
- {
- char *new_write_ptr = fp->_IO_write_ptr;
-
- if (clen > 0)
- offset += (fp->_wide_data->_IO_write_ptr
- - fp->_wide_data->_IO_write_base) / clen;
- else
- {
- enum __codecvt_result status = __codecvt_ok;
- delta = (fp->_wide_data->_IO_write_ptr
- - fp->_wide_data->_IO_write_base);
- const wchar_t *write_base = fp->_wide_data->_IO_write_base;
-
- /* FIXME: This actually ends up in two iterations of conversion,
- one here and the next when the buffer actually gets flushed.
- It may be possible to optimize this in future so that
- wdo_write identifies already converted content and does not
- redo it. In any case, this is much better than having to
- flush buffers for every ftell. */
- do
- {
- /* There is not enough space in the buffer to do the entire
- conversion, so there is no point trying to avoid the
- buffer flush. Just do it and go back to how it was with
- the read mode. */
- if (status == __codecvt_partial
- || (delta > 0 && new_write_ptr == fp->_IO_buf_end))
- {
- if (_IO_switch_to_wget_mode (fp))
- return WEOF;
- goto flushed;
- }
-
- const wchar_t *new_wbase = fp->_wide_data->_IO_write_base;
- fp->_wide_data->_IO_state = fp->_wide_data->_IO_last_state;
- status = (*cv->__codecvt_do_out) (cv,
- &fp->_wide_data->_IO_state,
- write_base,
- write_base + delta,
- &new_wbase,
- new_write_ptr,
- fp->_IO_buf_end,
- &new_write_ptr);
-
- delta -= new_wbase - write_base;
-
- /* If there was an error, then return WEOF.
- TODO: set buffer state. */
- if (__builtin_expect (status == __codecvt_error, 0))
- return WEOF;
- }
- while (delta > 0);
- }
-
- /* _IO_read_end coincides with fp._offset, so the actual file position
- is fp._offset - (_IO_read_end - new_write_ptr). This is fine
- even if fp._offset is not set, since fp->_IO_read_end is then at
- _IO_buf_base and this adjustment is for unbuffered output. */
- offset -= fp->_IO_read_end - new_write_ptr;
- }
if (fp->_offset == _IO_pos_BAD)
- {
- if (mode != 0)
- goto dumb;
- else
- {
- result = _IO_SYSSEEK (fp, 0, dir);
- if (result == EOF)
- return result;
- fp->_offset = result;
- }
- }
+ goto dumb;
/* Make offset absolute, assuming current pointer is file_ptr(). */
offset += fp->_offset;
}
/* At this point, dir==_IO_seek_set. */
- /* If we are only interested in the current position we've found it now. */
- if (mode == 0)
- return offset;
-
/* If destination is within current buffer, optimize: */
if (fp->_offset != _IO_pos_BAD && fp->_IO_read_base != NULL
&& !_IO_in_backup (fp))
projects / thirdparty / glibc.git / commitdiff
