1  /* Test of freadptr() function.
       2     Copyright (C) 2007-2023 Free Software Foundation, Inc.
       3  
       4     This program is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU General Public License as published by
       6     the Free Software Foundation, either version 3 of the License, or
       7     (at your option) any later version.
       8  
       9     This program is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12     GNU General Public License for more details.
      13  
      14     You should have received a copy of the GNU General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
      18  
      19  #include <config.h>
      20  
      21  #include "freadptr.h"
      22  
      23  #include <stdio.h>
      24  #include <stdlib.h>
      25  #include <unistd.h>
      26  
      27  #include "macros.h"
      28  
      29  static int
      30  freadptrbufsize (FILE *fp)
      31  {
      32    size_t size = 0;
      33  
      34    freadptr (fp, &size);
      35    return size;
      36  }
      37  
      38  int
      39  main (int argc, char **argv)
      40  {
      41    int nbytes = atoi (argv[1]);
      42    if (nbytes > 0)
      43      {
      44        void *buf = malloc (nbytes);
      45        ASSERT (fread (buf, 1, nbytes, stdin) == nbytes);
      46        free (buf);
      47      }
      48  
      49    if (nbytes == 0)
      50      ASSERT (freadptrbufsize (stdin) == 0);
      51    else
      52      {
      53        if (lseek (0, 0, SEEK_CUR) == nbytes)
      54          /* An unbuffered stdio, such as BeOS or on uClibc compiled without
      55             __STDIO_BUFFERS.  */
      56          ASSERT (freadptrbufsize (stdin) == 0);
      57        else
      58          /* Normal buffered stdio.  */
      59          ASSERT (freadptrbufsize (stdin) != 0);
      60      }
      61  
      62    return 0;
      63  }