kc3-lang/gnulib/tests/test-freadahead.c

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• Hash : 7b089321
  Author :
  Date : 2025-01-01T09:24:36
  

  maint: run 'make update-copyright'
  

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• tests/test-freadahead.c

• /* Test of freadahead() function.
     Copyright (C) 2007-2025 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
  
     This program 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 General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  
  #include <config.h>
  
  #include "freadahead.h"
  
  #include <stdlib.h>
  #include <unistd.h>
  
  #include "macros.h"
  
  int
  main (int argc, char **argv)
  {
    int nbytes = atoi (argv[1]);
    if (nbytes > 0)
      {
        void *buf = malloc (nbytes);
        ASSERT (fread (buf, 1, nbytes, stdin) == nbytes);
        free (buf);
      }
  
    if (nbytes == 0)
      ASSERT (freadahead (stdin) == 0);
    else
      {
        if (lseek (0, 0, SEEK_CUR) == nbytes)
          /* An unbuffered stdio, such as BeOS or on uClibc compiled without
             __STDIO_BUFFERS.  */
          ASSERT (freadahead (stdin) == 0);
        else
          {
            /* Normal buffered stdio.  */
            size_t buffered;
            int c, c2;
  
            ASSERT (freadahead (stdin) != 0);
            buffered = freadahead (stdin);
  
            c = fgetc (stdin);
            ASSERT (freadahead (stdin) == buffered - 1);
            ungetc (c, stdin);
            ASSERT (freadahead (stdin) == buffered);
            c2 = fgetc (stdin);
            ASSERT (c2 == c);
            ASSERT (freadahead (stdin) == buffered - 1);
  
            c = '@';
            ungetc (c, stdin);
            ASSERT (freadahead (stdin) == buffered);
            c2 = fgetc (stdin);
            ASSERT (c2 == c);
            ASSERT (freadahead (stdin) == buffered - 1);
          }
      }
  
    /* Free memory allocated during ungetc().  */
    fclose (stdin);
  
    return test_exit_status;
  }
  

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