1  /* Test for open_memstream BZ #21037.
       2     Copyright (C) 2018-2023 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 "tst-memstream.h"
      20  
      21  static void
      22  mcheck_abort (enum mcheck_status ev)
      23  {
      24    printf ("mecheck failed with status %d\n", (int) ev);
      25    exit (1);
      26  }
      27  
      28  static int
      29  do_test (void)
      30  {
      31    mcheck_pedantic (mcheck_abort);
      32  
      33    /* Check if freopen proper fflush the stream.  */
      34    {
      35      CHAR_T old[] = W("old");
      36      CHAR_T *buf = old;
      37      size_t size;
      38  
      39      FILE *fp = OPEN_MEMSTREAM (&buf, &size);
      40      TEST_VERIFY_EXIT (fp != NULL);
      41  
      42      FPUTS (W("new"), fp);
      43      /* The stream buffer pointer should be updated with only a fflush or
      44         fclose.  */
      45      TEST_COMPARE (STRCMP (buf, old), 0);
      46  
      47      /* The old stream should be fflush the stream, even for an invalid
      48         streams.  */
      49      FILE *nfp = freopen ("invalid-file", "r", fp);
      50      TEST_VERIFY_EXIT (nfp == NULL);
      51  
      52      TEST_VERIFY (STRCMP (buf, W("new")) == 0);
      53      TEST_COMPARE_BLOB (buf, STRLEN (buf) * sizeof (CHAR_T),
      54  		       W("new"), STRLEN (W("new")) * sizeof (CHAR_T));
      55  
      56      TEST_COMPARE (fclose (fp), 0);
      57  
      58      free (buf);
      59    }
      60  
      61    return 0;
      62  }
      63  
      64  #include <support/test-driver.c>