/* Test that _IO_wfile_sync does not crash (bug 20568).

   Copyright (C) 2019 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

   <http://www.gnu.org/licenses/>.  */

#include <locale.h>

#include <stdio.h>

#include <wchar.h>

#include <support/check.h>

#include <support/xunistd.h>

static int

do_test (void)

{

  TEST_VERIFY_EXIT (setlocale (LC_ALL, "de_DE.UTF-8") != NULL);

  /* Fill the stdio buffer and advance the read pointer.  */

  TEST_VERIFY_EXIT (fgetwc (stdin) != WEOF);

  /* This calls _IO_wfile_sync, it should not crash.  */

  TEST_VERIFY_EXIT (setvbuf (stdin, NULL, _IONBF, 0) == 0);

  /* Verify that the external file offset has been synchronized.  */

  TEST_COMPARE (xlseek (0, 0, SEEK_CUR), 1);

  return 0;

}

#include <support/test-driver.c>