mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 07:20:11 +00:00
5d4ab106d4
Ensure that fwrite() behaves correctly even when the stream is read-only. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
/* Test fwrite on a read-only stream.
|
|
Copyright (C) 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 <stdio.h>
|
|
#include <support/check.h>
|
|
#include <support/temp_file.h>
|
|
#include <support/xstdio.h>
|
|
#include <support/xunistd.h>
|
|
|
|
/* A small buffer size is enough to run this test. */
|
|
#define BUFSIZE 4
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
int fd;
|
|
FILE *f;
|
|
struct stat64 st;
|
|
|
|
/* Create a temporary file and open it in read-only mode. */
|
|
fd = create_temp_file ("tst-fwrite-ro", NULL);
|
|
TEST_VERIFY_EXIT (fd != -1);
|
|
f = fdopen (fd, "r");
|
|
TEST_VERIFY_EXIT (f != NULL);
|
|
|
|
/* Try to write to the temporary file with nmemb = 0, then check that
|
|
fwrite returns 0. No errors are expected from this. */
|
|
TEST_COMPARE (fwrite ("a", 1, 0, f), 0);
|
|
TEST_COMPARE (ferror (f), 0);
|
|
|
|
/* Try to write to the temporary file with size = 0, then check that
|
|
fwrite returns 0. No errors are expected from this. */
|
|
TEST_COMPARE (fwrite ("a", 0, 1, f), 0);
|
|
TEST_COMPARE (ferror (f), 0);
|
|
|
|
/* Try to write a single byte to the temporary file, then check that
|
|
fwrite returns 0. Check if an error was reported. */
|
|
TEST_COMPARE (fwrite ("a", 1, 1, f), 0);
|
|
TEST_COMPARE (ferror (f), 1);
|
|
clearerr (f);
|
|
|
|
xfstat64 (fd, &st);
|
|
TEST_COMPARE (st.st_size, 0);
|
|
|
|
xfclose (f);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|