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/* Test truncating a file.
Copyright (C) 2017-2023 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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <unistd.h>
#include "signature.h"
SIGNATURE_CHECK (truncate, int, (const char *, off_t));
#include <errno.h>
#include <fcntl.h>
#include "ignore-value.h"
#include "macros.h"
#define BASE "test-truncate.t"
int
main (int argc, char *argv[])
{
/* Clean up any trash from prior testsuite runs. */
ignore_value (system ("rm -rf " BASE "*"));
{
int fd = open (BASE "file", O_RDWR | O_TRUNC | O_CREAT, 0600);
ASSERT (fd >= 0);
ASSERT (write (fd, "Hello", 5) == 5);
close (fd);
}
{
int fd = open (BASE "file", O_RDONLY);
ASSERT (fd >= 0);
ASSERT (lseek (fd, 0, SEEK_END) == 5);
close (fd);
}
/* Test increasing the size. */
ASSERT (truncate (BASE "file", 314159) == 0);
{
int fd = open (BASE "file", O_RDONLY);
ASSERT (fd >= 0);
ASSERT (lseek (fd, 0, SEEK_END) == 314159);
close (fd);
}
/* Test reducing the size. */
ASSERT (truncate (BASE "file", 3) == 0);
{
int fd = open (BASE "file", O_RDONLY);
ASSERT (fd >= 0);
ASSERT (lseek (fd, 0, SEEK_END) == 3);
close (fd);
}
/* Test reducing the size to 0. */
ASSERT (truncate (BASE "file", 0) == 0);
{
int fd = open (BASE "file", O_RDONLY);
ASSERT (fd >= 0);
ASSERT (lseek (fd, 0, SEEK_END) == 0);
close (fd);
}
/* Test behaviour for nonexistent files. */
{
errno = 0;
ASSERT (truncate ("/nonexistent", 0) == -1);
ASSERT (errno == ENOENT);
}
/* Test behaviour for directories. */
{
errno = 0;
ASSERT (truncate (".", 0) == -1);
ASSERT (errno == EISDIR
|| /* on native Windows */ errno == EACCES);
}
/* Test behaviour for trailing slashes. */
{
errno = 0;
ASSERT (truncate (BASE "file/", 0) == -1);
ASSERT (errno == ENOTDIR
|| /* on native Windows */ errno == EINVAL);
}
/* Test behaviour for invalid lengths. */
{
errno = 0;
ASSERT (truncate (BASE "file", -3) == -1);
ASSERT (errno == EINVAL);
}
/* Cleanup. */
ASSERT (unlink (BASE "file") == 0);
return 0;
}
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