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/* Test that _IO_wfile_sync does not crash (bug 20568).
Copyright (C) 2019-2022 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 <fcntl.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <support/check.h>
#include <support/xstdio.h>
#include <support/xunistd.h>
#include <support/temp_file.h>
static const char test_data[] = "This is a test of _IO_wfile_sync.";
static int
do_test (void)
{
static char *infile;
int infd;
FILE *infp;
infd = create_temp_file ("tst-wfile-sync-in-", &infile);
xwrite (infd, test_data, strlen (test_data));
xclose (infd);
infd = xopen (infile, O_RDONLY, 0);
infp = fdopen (infd, "r");
TEST_VERIFY_EXIT (setlocale (LC_ALL, "de_DE.UTF-8") != NULL);
/* Fill the stdio buffer and advance the read pointer. */
TEST_VERIFY_EXIT (fgetwc (infp) != WEOF);
/* This calls _IO_wfile_sync, it should not crash. */
TEST_VERIFY_EXIT (setvbuf (infp, NULL, _IONBF, 0) == 0);
/* Verify that the external file offset has been synchronized. */
TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 1);
fclose (infp);
free (infile);
return 0;
}
#include <support/test-driver.c>
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