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glibc/stdio-common/tst-fseek.c

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/* Tests of fseek and fseeko.
Copyright (C) 2000-2024 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
<https://www.gnu.org/licenses/>. */
#include <error.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <sys/stat.h>
#include <support/support.h>
static int
do_test (void)
{
const char *tmpdir;
char *fname;
int fd;
FILE *fp;
const char outstr[] = "hello world!\n";
char strbuf[sizeof outstr];
char buf[200];
struct stat64 st1;
struct stat64 st2;
int result = 0;
tmpdir = getenv ("TMPDIR");
if (tmpdir == NULL || tmpdir[0] == '\0')
tmpdir = "/tmp";
fname = xasprintf ("%s/tst-fseek.XXXXXX", tmpdir);
/* Create a temporary file. */
fd = mkstemp (fname);
if (fd == -1)
error (EXIT_FAILURE, errno, "cannot open temporary file");
fp = fdopen (fd, "w+");
if (fp == NULL)
error (EXIT_FAILURE, errno, "cannot get FILE for temporary file");
setbuffer (fp, strbuf, sizeof (outstr) -1);
if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
{
printf ("%d: write error\n", __LINE__);
result = 1;
goto out;
}
/* The EOF flag must be reset. */
if (fgetc (fp) != EOF)
{
printf ("%d: managed to read at end of file\n", __LINE__);
result = 1;
}
else if (! feof (fp))
{
printf ("%d: EOF flag not set\n", __LINE__);
result = 1;
}
if (fseek (fp, 0, SEEK_CUR) != 0)
{
printf ("%d: fseek(fp, 0, SEEK_CUR) failed\n", __LINE__);
result = 1;
}
else if (feof (fp))
{
printf ("%d: fseek() didn't reset EOF flag\n", __LINE__);
result = 1;
}
/* Do the same for fseeko(). */
if (fgetc (fp) != EOF)
{
printf ("%d: managed to read at end of file\n", __LINE__);
result = 1;
}
else if (! feof (fp))
{
printf ("%d: EOF flag not set\n", __LINE__);
result = 1;
}
if (fseeko (fp, 0, SEEK_CUR) != 0)
{
printf ("%d: fseek(fp, 0, SEEK_CUR) failed\n", __LINE__);
result = 1;
}
else if (feof (fp))
{
printf ("%d: fseek() didn't reset EOF flag\n", __LINE__);
result = 1;
}
/* Go back to the beginning of the file: absolute. */
if (fseek (fp, 0, SEEK_SET) != 0)
{
printf ("%d: fseek(fp, 0, SEEK_SET) failed\n", __LINE__);
result = 1;
}
else if (fflush (fp) != 0)
{
printf ("%d: fflush() failed\n", __LINE__);
result = 1;
}
else if (lseek (fd, 0, SEEK_CUR) != 0)
{
printf ("%d: lseek() returned different position\n", __LINE__);
result = 1;
}
else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
{
printf ("%d: fread() failed\n", __LINE__);
result = 1;
}
else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
{
printf ("%d: content after fseek(,,SEEK_SET) wrong\n", __LINE__);
result = 1;
}
/* Now with fseeko. */
if (fseeko (fp, 0, SEEK_SET) != 0)
{
printf ("%d: fseeko(fp, 0, SEEK_SET) failed\n", __LINE__);
result = 1;
}
else if (fflush (fp) != 0)
{
printf ("%d: fflush() failed\n", __LINE__);
result = 1;
}
else if (lseek (fd, 0, SEEK_CUR) != 0)
{
printf ("%d: lseek() returned different position\n", __LINE__);
result = 1;
}
else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
{
printf ("%d: fread() failed\n", __LINE__);
result = 1;
}
else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
{
printf ("%d: content after fseeko(,,SEEK_SET) wrong\n", __LINE__);
result = 1;
}
/* Go back to the beginning of the file: relative. */
if (fseek (fp, -((int) sizeof (outstr) - 1), SEEK_CUR) != 0)
{
printf ("%d: fseek(fp, 0, SEEK_SET) failed\n", __LINE__);
result = 1;
}
else if (fflush (fp) != 0)
{
printf ("%d: fflush() failed\n", __LINE__);
result = 1;
}
else if (lseek (fd, 0, SEEK_CUR) != 0)
{
printf ("%d: lseek() returned different position\n", __LINE__);
result = 1;
}
else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
{
printf ("%d: fread() failed\n", __LINE__);
result = 1;
}
else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
{
printf ("%d: content after fseek(,,SEEK_SET) wrong\n", __LINE__);
result = 1;
}
/* Now with fseeko. */
if (fseeko (fp, -((int) sizeof (outstr) - 1), SEEK_CUR) != 0)
{
printf ("%d: fseeko(fp, 0, SEEK_SET) failed\n", __LINE__);
result = 1;
}
else if (fflush (fp) != 0)
{
printf ("%d: fflush() failed\n", __LINE__);
result = 1;
}
else if (lseek (fd, 0, SEEK_CUR) != 0)
{
printf ("%d: lseek() returned different position\n", __LINE__);
result = 1;
}
else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
{
printf ("%d: fread() failed\n", __LINE__);
result = 1;
}
else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
{
printf ("%d: content after fseeko(,,SEEK_SET) wrong\n", __LINE__);
result = 1;
}
/* Go back to the beginning of the file: from the end. */
if (fseek (fp, -((int) sizeof (outstr) - 1), SEEK_END) != 0)
{
printf ("%d: fseek(fp, 0, SEEK_SET) failed\n", __LINE__);
result = 1;
}
else if (fflush (fp) != 0)
{
printf ("%d: fflush() failed\n", __LINE__);
result = 1;
}
else if (lseek (fd, 0, SEEK_CUR) != 0)
{
printf ("%d: lseek() returned different position\n", __LINE__);
result = 1;
}
else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
{
printf ("%d: fread() failed\n", __LINE__);
result = 1;
}
else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
{
printf ("%d: content after fseek(,,SEEK_SET) wrong\n", __LINE__);
result = 1;
}
/* Now with fseeko. */
if (fseeko (fp, -((int) sizeof (outstr) - 1), SEEK_END) != 0)
{
printf ("%d: fseeko(fp, 0, SEEK_SET) failed\n", __LINE__);
result = 1;
}
else if (fflush (fp) != 0)
{
printf ("%d: fflush() failed\n", __LINE__);
result = 1;
}
else if (lseek (fd, 0, SEEK_CUR) != 0)
{
printf ("%d: lseek() returned different position\n", __LINE__);
result = 1;
}
else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
{
printf ("%d: fread() failed\n", __LINE__);
result = 1;
}
else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
{
printf ("%d: content after fseeko(,,SEEK_SET) wrong\n", __LINE__);
result = 1;
}
if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
{
printf ("%d: write error 2\n", __LINE__);
result = 1;
goto out;
}
if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
{
printf ("%d: write error 3\n", __LINE__);
result = 1;
goto out;
}
if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
{
printf ("%d: write error 4\n", __LINE__);
result = 1;
goto out;
}
if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
{
printf ("%d: write error 5\n", __LINE__);
result = 1;
goto out;
}
if (fputc ('1', fp) == EOF || fputc ('2', fp) == EOF)
{
printf ("%d: cannot add characters at the end\n", __LINE__);
result = 1;
goto out;
}
/* Check the access time. */
if (fstat64 (fd, &st1) < 0)
{
printf ("%d: fstat64() before fseeko() failed\n\n", __LINE__);
result = 1;
}
else
{
sleep (1);
if (fseek (fp, -(2 + 2 * (sizeof (outstr) - 1)), SEEK_CUR) != 0)
{
printf ("%d: fseek() after write characters failed\n", __LINE__);
result = 1;
goto out;
}
else
{
time_t t;
/* Make sure the timestamp actually can be different. */
sleep (1);
t = time (NULL);
if (fstat64 (fd, &st2) < 0)
{
printf ("%d: fstat64() after fseeko() failed\n\n", __LINE__);
result = 1;
}
if (st1.st_ctime >= t)
{
printf ("%d: st_ctime not updated\n", __LINE__);
result = 1;
}
if (st1.st_mtime >= t)
{
printf ("%d: st_mtime not updated\n", __LINE__);
result = 1;
}
if (st1.st_ctime >= st2.st_ctime)
{
printf ("%d: st_ctime not changed\n", __LINE__);
result = 1;
}
if (st1.st_mtime >= st2.st_mtime)
{
printf ("%d: st_mtime not changed\n", __LINE__);
result = 1;
}
}
}
if (fread (buf, 1, 2 + 2 * (sizeof (outstr) - 1), fp)
!= 2 + 2 * (sizeof (outstr) - 1))
{
printf ("%d: reading 2 records plus bits failed\n", __LINE__);
result = 1;
}
else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0
|| memcmp (&buf[sizeof (outstr) - 1], outstr,
sizeof (outstr) - 1) != 0
|| buf[2 * (sizeof (outstr) - 1)] != '1'
|| buf[2 * (sizeof (outstr) - 1) + 1] != '2')
{
printf ("%d: reading records failed\n", __LINE__);
result = 1;
}
else if (ungetc ('9', fp) == EOF)
{
printf ("%d: ungetc() failed\n", __LINE__);
result = 1;
}
else if (fseek (fp, -(2 + 2 * (sizeof (outstr) - 1)), SEEK_END) != 0)
{
printf ("%d: fseek after ungetc failed\n", __LINE__);
result = 1;
}
else if (fread (buf, 1, 2 + 2 * (sizeof (outstr) - 1), fp)
!= 2 + 2 * (sizeof (outstr) - 1))
{
printf ("%d: reading 2 records plus bits failed\n", __LINE__);
result = 1;
}
else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0
|| memcmp (&buf[sizeof (outstr) - 1], outstr,
sizeof (outstr) - 1) != 0
|| buf[2 * (sizeof (outstr) - 1)] != '1')
{
printf ("%d: reading records for the second time failed\n", __LINE__);
result = 1;
}
else if (buf[2 * (sizeof (outstr) - 1) + 1] == '9')
{
printf ("%d: unget character not ignored\n", __LINE__);
result = 1;
}
else if (buf[2 * (sizeof (outstr) - 1) + 1] != '2')
{
printf ("%d: unget somehow changed character\n", __LINE__);
result = 1;
}
fclose (fp);
fp = fopen (fname, "r");
if (fp == NULL)
{
printf ("%d: fopen() failed\n\n", __LINE__);
result = 1;
}
else if (fstat64 (fileno (fp), &st1) < 0)
{
printf ("%d: fstat64() before fseeko() failed\n\n", __LINE__);
result = 1;
}
else if (fseeko (fp, 0, SEEK_END) != 0)
{
printf ("%d: fseeko(fp, 0, SEEK_END) failed\n", __LINE__);
result = 1;
}
else if (ftello (fp) != st1.st_size)
{
printf ("%d: fstat64 st_size %zd ftello %zd\n", __LINE__,
(size_t) st1.st_size, (size_t) ftello (fp));
result = 1;
}
else
printf ("%d: SEEK_END works\n", __LINE__);
if (fp != NULL)
fclose (fp);
fp = fopen (fname, "r");
if (fp == NULL)
{
printf ("%d: fopen() failed\n\n", __LINE__);
result = 1;
}
else if (fstat64 (fileno (fp), &st1) < 0)
{
printf ("%d: fstat64() before fgetc() failed\n\n", __LINE__);
result = 1;
}
else if (fgetc (fp) == EOF)
{
printf ("%d: fgetc() before fseeko() failed\n\n", __LINE__);
result = 1;
}
else if (fseeko (fp, 0, SEEK_END) != 0)
{
printf ("%d: fseeko(fp, 0, SEEK_END) failed\n", __LINE__);
result = 1;
}
else if (ftello (fp) != st1.st_size)
{
printf ("%d: fstat64 st_size %zd ftello %zd\n", __LINE__,
(size_t) st1.st_size, (size_t) ftello (fp));
result = 1;
}
else
printf ("%d: SEEK_END works\n", __LINE__);
if (fp != NULL)
fclose (fp);
out:
unlink (fname);
return result;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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