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/* Test of opening a file stream.
Copyright (C) 2007-2023 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/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
/* Include <config.h> and a form of <stdio.h> first. */
#include <errno.h>
#include <unistd.h>
#include "macros.h"
/* Tell GCC not to warn about the specific edge cases tested here. */
#if __GNUC__ >= 10
# pragma GCC diagnostic ignored "-Wanalyzer-file-leak"
#endif
/* Test fopen. Assumes BASE is defined. */
static int
test_fopen (void)
{
FILE *f;
/* Remove anything from prior partial run. */
unlink (BASE "file");
/* Read requires existing file. */
errno = 0;
ASSERT (fopen (BASE "file", "r") == NULL);
ASSERT (errno == ENOENT);
/* Write can create a file. */
f = fopen (BASE "file", "w");
ASSERT (f);
ASSERT (fclose (f) == 0);
/* Trailing slash is invalid on non-directory. */
errno = 0;
ASSERT (fopen (BASE "file/", "r") == NULL);
ASSERT (errno == ENOTDIR || errno == EISDIR || errno == EINVAL);
errno = 0;
ASSERT (fopen (BASE "file/", "r+") == NULL);
ASSERT (errno == ENOTDIR || errno == EISDIR || errno == EINVAL);
/* Cannot create a directory. */
errno = 0;
ASSERT (fopen ("nonexist.ent/", "w") == NULL);
ASSERT (errno == ENOTDIR || errno == EISDIR || errno == ENOENT
|| errno == EINVAL);
/* Directories cannot be opened for writing. */
errno = 0;
ASSERT (fopen (".", "w") == NULL);
ASSERT (errno == EISDIR || errno == EINVAL || errno == EACCES);
errno = 0;
ASSERT (fopen ("./", "w") == NULL);
ASSERT (errno == EISDIR || errno == EINVAL || errno == EACCES);
errno = 0;
ASSERT (fopen (".", "r+") == NULL);
ASSERT (errno == EISDIR || errno == EINVAL || errno == EACCES);
errno = 0;
ASSERT (fopen ("./", "r+") == NULL);
ASSERT (errno == EISDIR || errno == EINVAL || errno == EACCES);
/* /dev/null must exist, and be writable. */
f = fopen ("/dev/null", "r");
ASSERT (f);
ASSERT (fclose (f) == 0);
f = fopen ("/dev/null", "w");
ASSERT (f);
ASSERT (fclose (f) == 0);
/* Cleanup. */
ASSERT (unlink (BASE "file") == 0);
return 0;
}
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