mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-10 07:10:06 +00:00
685 lines
17 KiB
C
685 lines
17 KiB
C
/* Verify that ftell returns the correct value at various points before and
|
|
after the handler on which it is called becomes active.
|
|
Copyright (C) 2014-2017 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);
|
|
typedef void *(*fgets_func_t) (void *ws, int n, FILE *fp);
|
|
fputs_func_t fputs_func;
|
|
fgets_func_t fgets_func;
|
|
|
|
/* This test verifies that the offset reported by ftell is correct after the
|
|
file is truncated using ftruncate. ftruncate does not change the file
|
|
offset on truncation and hence, SEEK_CUR should continue to point to the
|
|
old offset and not be changed to the new offset. */
|
|
static int
|
|
do_ftruncate_test (const char *filename)
|
|
{
|
|
FILE *fp = NULL;
|
|
int fd;
|
|
int ret = 0;
|
|
struct test
|
|
{
|
|
const char *mode;
|
|
int fd_mode;
|
|
} test_modes[] = {
|
|
{"r+", O_RDWR},
|
|
{"w", O_WRONLY | O_TRUNC},
|
|
{"w+", O_RDWR | O_TRUNC},
|
|
{"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++)
|
|
{
|
|
int fileret;
|
|
printf ("\tftruncate: %s (file, \"%s\"): ",
|
|
j == 0 ? "fopen" : "fdopen",
|
|
test_modes[i].mode);
|
|
|
|
if (j == 0)
|
|
fileret = get_handles_fopen (filename, fd, fp, test_modes[i].mode);
|
|
else
|
|
fileret = get_handles_fdopen (filename, fd, fp,
|
|
test_modes[i].fd_mode,
|
|
test_modes[i].mode);
|
|
|
|
if (fileret != 0)
|
|
return fileret;
|
|
|
|
/* Write some data. */
|
|
size_t written = fputs_func (data, fp);
|
|
|
|
if (written == EOF)
|
|
{
|
|
printf ("fputs[1] failed to write data\n");
|
|
ret |= 1;
|
|
}
|
|
|
|
/* Record the offset. */
|
|
long offset = ftell (fp);
|
|
|
|
/* Flush data to allow switching active handles. */
|
|
if (fflush (fp))
|
|
{
|
|
printf ("Flush failed: %m\n");
|
|
ret |= 1;
|
|
}
|
|
|
|
/* Now truncate the file. */
|
|
if (ftruncate (fd, 0) != 0)
|
|
{
|
|
printf ("Failed to truncate file: %m\n");
|
|
ret |= 1;
|
|
}
|
|
|
|
/* ftruncate does not change the offset, so there is no need to call
|
|
anything to be able to switch active handles. */
|
|
long new_offset = ftell (fp);
|
|
|
|
/* The offset should remain unchanged since ftruncate does not update
|
|
it. */
|
|
if (offset != new_offset)
|
|
{
|
|
printf ("Incorrect offset. Expected %ld, but got %ld\n",
|
|
offset, new_offset);
|
|
|
|
ret |= 1;
|
|
}
|
|
else
|
|
printf ("offset = %ld\n", offset);
|
|
|
|
fclose (fp);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
/* Test that ftell output after a rewind is correct. */
|
|
static int
|
|
do_rewind_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[] = {
|
|
{"w", O_WRONLY | O_TRUNC, 0, data_len},
|
|
{"w+", O_RDWR | O_TRUNC, 0, data_len},
|
|
{"r+", O_RDWR, 0, data_len},
|
|
/* The new offsets for 'a' and 'a+' modes have to factor in the
|
|
previous writes since they always append to the end of the
|
|
file. */
|
|
{"a", O_WRONLY, 0, 3 * data_len},
|
|
{"a+", O_RDWR, 0, 4 * data_len},
|
|
};
|
|
|
|
/* Empty the file before the test so that our offsets are simple to
|
|
calculate. */
|
|
FILE *fp = fopen (filename, "w");
|
|
if (fp == NULL)
|
|
{
|
|
printf ("Failed to open file for emptying\n");
|
|
return 1;
|
|
}
|
|
fclose (fp);
|
|
|
|
for (int j = 0; j < 2; j++)
|
|
{
|
|
for (int i = 0; i < sizeof (test_modes) / sizeof (struct test); i++)
|
|
{
|
|
FILE *fp;
|
|
int fd;
|
|
int fileret;
|
|
|
|
printf ("\trewind: %s (file, \"%s\"): ", j == 0 ? "fdopen" : "fopen",
|
|
test_modes[i].mode);
|
|
|
|
if (j == 0)
|
|
fileret = get_handles_fdopen (filename, fd, fp,
|
|
test_modes[i].fd_mode,
|
|
test_modes[i].mode);
|
|
else
|
|
fileret = get_handles_fopen (filename, fd, fp, test_modes[i].mode);
|
|
|
|
if (fileret != 0)
|
|
return fileret;
|
|
|
|
/* Write some content to the file, rewind and ensure that the ftell
|
|
output after the rewind is 0. POSIX does not specify what the
|
|
behavior is when a file is rewound in 'a' mode, so we retain
|
|
current behavior, which is to keep the 0 offset. */
|
|
size_t written = fputs_func (data, fp);
|
|
|
|
if (written == EOF)
|
|
{
|
|
printf ("fputs[1] failed to write data\n");
|
|
ret |= 1;
|
|
}
|
|
|
|
rewind (fp);
|
|
long offset = ftell (fp);
|
|
|
|
if (offset != test_modes[i].old_off)
|
|
{
|
|
printf ("Incorrect old offset. Expected %zu, but got %ld, ",
|
|
test_modes[i].old_off, offset);
|
|
ret |= 1;
|
|
}
|
|
else
|
|
printf ("old offset = %ld, ", offset);
|
|
|
|
written = fputs_func (data, fp);
|
|
|
|
if (written == EOF)
|
|
{
|
|
printf ("fputs[1] failed to write data\n");
|
|
ret |= 1;
|
|
}
|
|
|
|
/* After this write, the offset in append modes should factor in the
|
|
implicit lseek to the end of file. */
|
|
offset = ftell (fp);
|
|
if (offset != test_modes[i].new_off)
|
|
{
|
|
printf ("Incorrect new offset. Expected %zu, but got %ld\n",
|
|
test_modes[i].new_off, offset);
|
|
ret |= 1;
|
|
}
|
|
else
|
|
printf ("new offset = %ld\n", offset);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* 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;
|
|
size_t eof_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. We don't use eof_off in w and a modes since
|
|
they don't allow reading. */
|
|
{"w", O_WRONLY | O_TRUNC, 0, data_len, 0},
|
|
{"w+", O_RDWR | O_TRUNC, 0, data_len, 2 * data_len},
|
|
{"r+", O_RDWR, 0, data_len, 3 * data_len},
|
|
/* For the 'a' mode, the initial file position should be the
|
|
current end of file. After the write, the offset has data_len
|
|
added to the old value. For a+ mode however, the initial file
|
|
position is the file position of the underlying file descriptor,
|
|
since it is initially assumed to be in read mode. */
|
|
{"a", O_WRONLY, 3 * data_len, 4 * data_len, 5 * data_len},
|
|
{"a+", O_RDWR, 0, 5 * data_len, 6 * 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;
|
|
int fileret;
|
|
|
|
printf ("\tftell: %s (file, \"%s\"): ", j == 0 ? "fdopen" : "fopen",
|
|
test_modes[i].mode);
|
|
|
|
if (j == 0)
|
|
fileret = get_handles_fdopen (filename, fd, fp,
|
|
test_modes[i].fd_mode,
|
|
test_modes[i].mode);
|
|
else
|
|
fileret = get_handles_fopen (filename, fd, fp, test_modes[i].mode);
|
|
|
|
if (fileret != 0)
|
|
return fileret;
|
|
|
|
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 write_ret = write (fd, data, data_len);
|
|
if (write_ret != data_len)
|
|
{
|
|
printf ("write failed (%m)\n");
|
|
ret |= 1;
|
|
}
|
|
off = ftell (fp);
|
|
|
|
if (off != test_modes[i].new_off)
|
|
{
|
|
printf ("Incorrect new offset. Expected %zu but got %ld",
|
|
test_modes[i].new_off, off);
|
|
ret |= 1;
|
|
}
|
|
else
|
|
printf ("new offset = %ld", off);
|
|
|
|
/* Read to the end, write some data to the fd and check if ftell can
|
|
see the new ofset. Do this test only for files that allow
|
|
reading. */
|
|
if (test_modes[i].fd_mode != O_WRONLY)
|
|
{
|
|
wchar_t tmpbuf[data_len];
|
|
|
|
rewind (fp);
|
|
|
|
while (fgets_func (tmpbuf, data_len, fp) && !feof (fp));
|
|
|
|
write_ret = write (fd, data, data_len);
|
|
if (write_ret != data_len)
|
|
{
|
|
printf ("write failed (%m)\n");
|
|
ret |= 1;
|
|
}
|
|
off = ftell (fp);
|
|
|
|
if (off != test_modes[i].eof_off)
|
|
{
|
|
printf (", Incorrect offset after read EOF. "
|
|
"Expected %zu but got %ld\n",
|
|
test_modes[i].eof_off, off);
|
|
ret |= 1;
|
|
}
|
|
else
|
|
printf (", offset after EOF = %ld\n", off);
|
|
}
|
|
else
|
|
putc ('\n', stdout);
|
|
|
|
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 | O_TRUNC},
|
|
{"w+", O_RDWR | O_TRUNC},
|
|
{"r+", O_RDWR}
|
|
};
|
|
|
|
for (int j = 0; j < 2; j++)
|
|
{
|
|
for (int i = 0; i < sizeof (test_modes) / sizeof (struct test); i++)
|
|
{
|
|
int fileret;
|
|
printf ("\twrite: %s (file, \"%s\"): ", j == 0 ? "fopen" : "fdopen",
|
|
test_modes[i].mode);
|
|
|
|
if (j == 0)
|
|
fileret = get_handles_fopen (filename, fd, fp, test_modes[i].mode);
|
|
else
|
|
fileret = get_handles_fdopen (filename, fd, fp,
|
|
test_modes[i].fd_mode,
|
|
test_modes[i].mode);
|
|
|
|
if (fileret != 0)
|
|
return fileret;
|
|
|
|
/* Move offset to just before the end of the file. */
|
|
off_t seek_ret = lseek (fd, file_len - 1, SEEK_SET);
|
|
if (seek_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++)
|
|
{
|
|
int fileret;
|
|
|
|
printf ("\tappend: %s (file, \"%s\"): ", j == 0 ? "fopen" : "fdopen",
|
|
test_modes[i].mode);
|
|
|
|
if (j == 0)
|
|
fileret = get_handles_fopen (filename, fd, fp, test_modes[i].mode);
|
|
else
|
|
fileret = get_handles_fdopen (filename, fd, fp,
|
|
test_modes[i].fd_mode,
|
|
test_modes[i].mode);
|
|
|
|
if (fileret != 0)
|
|
return fileret;
|
|
|
|
/* 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);
|
|
}
|
|
}
|
|
|
|
/* For fdopen in 'a' mode, the file descriptor should not change if the file
|
|
is already open with the O_APPEND flag set. */
|
|
fd = open (filename, O_WRONLY | O_APPEND, 0);
|
|
if (fd == -1)
|
|
{
|
|
printf ("open(O_APPEND) failed: %m\n");
|
|
return 1;
|
|
}
|
|
|
|
off_t seek_ret = lseek (fd, file_len - 1, SEEK_SET);
|
|
if (seek_ret == -1)
|
|
{
|
|
printf ("lseek[O_APPEND][0] failed: %m\n");
|
|
ret |= 1;
|
|
}
|
|
|
|
fp = fdopen (fd, "a");
|
|
if (fp == NULL)
|
|
{
|
|
printf ("fdopen(O_APPEND) failed: %m\n");
|
|
close (fd);
|
|
return 1;
|
|
}
|
|
|
|
off_t new_seek_ret = lseek (fd, 0, SEEK_CUR);
|
|
if (seek_ret == -1)
|
|
{
|
|
printf ("lseek[O_APPEND][1] failed: %m\n");
|
|
ret |= 1;
|
|
}
|
|
|
|
printf ("\tappend: fdopen (file, \"a\"): O_APPEND: ");
|
|
|
|
if (seek_ret != new_seek_ret)
|
|
{
|
|
printf ("incorrectly modified file offset to %jd, should be %jd",
|
|
(intmax_t) new_seek_ret, (intmax_t) seek_ret);
|
|
ret |= 1;
|
|
}
|
|
else
|
|
printf ("retained current file offset %jd", (intmax_t) seek_ret);
|
|
|
|
new_seek_ret = ftello (fp);
|
|
|
|
if (seek_ret != new_seek_ret)
|
|
{
|
|
printf (", ftello reported incorrect offset %jd, should be %jd\n",
|
|
(intmax_t) new_seek_ret, (intmax_t) seek_ret);
|
|
ret |= 1;
|
|
}
|
|
else
|
|
printf (", ftello reported correct offset %jd\n", (intmax_t) seek_ret);
|
|
|
|
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);
|
|
ret |= do_rewind_test (filename);
|
|
ret |= do_ftruncate_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;
|
|
fgets_func = (fgets_func_t) fgets;
|
|
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;
|
|
fgets_func = (fgets_func_t) fgetws;
|
|
data = wide_data;
|
|
data_len = wcslen (wide_data);
|
|
ret |= do_one_test (filename);
|
|
|
|
return ret;
|
|
}
|