libio/tst-wfile-sync.c

   1 /* Test that _IO_wfile_sync does not crash (bug 20568).
   2    Copyright (C) 2019-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <locale.h>
  20 #include <stdio.h>
  21 #include <wchar.h>
  22 #include <support/check.h>
  23 #include <support/xunistd.h>
  24
  25 static int
  26 do_test (void)
  27 {
  28   TEST_VERIFY_EXIT (setlocale (LC_ALL, "de_DE.UTF-8") != NULL);
  29   /* Fill the stdio buffer and advance the read pointer.  */
  30   TEST_VERIFY_EXIT (fgetwc (stdin) != WEOF);
  31   /* This calls _IO_wfile_sync, it should not crash.  */
  32   TEST_VERIFY_EXIT (setvbuf (stdin, NULL, _IONBF, 0) == 0);
  33   /* Verify that the external file offset has been synchronized.  */
  34   TEST_COMPARE (xlseek (0, 0, SEEK_CUR), 1);
  35
  36   return 0;
  37 }
  38
  39 #include <support/test-driver.c>