libio/test-freopen.c

   1 /* Test for freopen implementation.
   2    Copyright (C) 2000-2023 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 <mcheck.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <wchar.h>
  23
  24
  25 int
  26 main (int argc, char *argv[])
  27 {
  28   FILE *fp;
  29
  30   mtrace ();
  31
  32   if (argc < 2)
  33     exit (1);
  34
  35   fp = fopen (argv[1], "w");
  36   if (fp == NULL)
  37     {
  38       puts ("fopen failed: %m");
  39       exit (1);
  40     }
  41
  42   fputs ("Hello world (mb)\n", fp);
  43
  44   fp = freopen (argv[1], "a+", fp);
  45   if (fp == NULL)
  46     {
  47       puts ("freopen failed: %m");
  48       exit (1);
  49     }
  50
  51   fputws (L"Hello world (wc)\n", fp);
  52
  53   fclose (fp);
  54
  55   return 0;
  56 }