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/* Common f{truncate} tests definitions.
Copyright (C) 2016-2024 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 <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
static void do_prepare (void);
#define PREPARE(argc, argv) do_prepare ()
static int do_test (void);
#define TEST_FUNCTION do_test ()
#include <test-skeleton.c>
static char *temp_filename;
static int temp_fd;
static void
do_prepare (void)
{
temp_fd = create_temp_file ("tst-trucate.", &temp_filename);
if (temp_fd == -1)
{
printf ("cannot create temporary file: %m\n");
exit (1);
}
}
#define FAIL(str) \
do { printf ("error: %s (line %d)\n", str, __LINE__); return 1; } while (0)
static int
do_test_with_offset (off_t offset)
{
struct stat st;
char buf[1000];
memset (buf, 0xcf, sizeof (buf));
if (pwrite (temp_fd, buf, sizeof (buf), offset) != sizeof (buf))
FAIL ("write failed");
if (fstat (temp_fd, &st) < 0 || st.st_size != (offset + sizeof (buf)))
FAIL ("initial size wrong");
if (ftruncate (temp_fd, offset + 800) < 0)
FAIL ("size reduction with ftruncate failed");
if (fstat (temp_fd, &st) < 0 || st.st_size != (offset + 800))
FAIL ("size after reduction with ftruncate is incorrect");
/* The following test covers more than POSIX. POSIX does not require
that ftruncate() can increase the file size. But we are testing
Unix systems. */
if (ftruncate (temp_fd, offset + 1200) < 0)
FAIL ("size increate with ftruncate failed");
if (fstat (temp_fd, &st) < 0 || st.st_size != (offset + 1200))
FAIL ("size after increase is incorrect");
if (truncate (temp_filename, offset + 800) < 0)
FAIL ("size reduction with truncate failed");
if (fstat (temp_fd, &st) < 0 || st.st_size != (offset + 800))
FAIL ("size after reduction with truncate incorrect");
/* The following test covers more than POSIX. POSIX does not require
that truncate() can increase the file size. But we are testing
Unix systems. */
if (truncate (temp_filename, (offset + 1200)) < 0)
FAIL ("size increase with truncate failed");
if (fstat (temp_fd, &st) < 0 || st.st_size != (offset + 1200))
FAIL ("size increase with truncate is incorrect");
return 0;
}
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