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

• /* Test of freadptr() 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>, 2008.  */
  
  #include <config.h>
  
  #include "freadptr.h"
  
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  
  #include "macros.h"
  
  int
  main (int argc, char **argv)
  {
    int nbytes = atoi (argv[1]);
    {
      void *buf = malloc (nbytes);
      ASSERT (fread (buf, 1, nbytes, stdin) == nbytes);
      free (buf);
    }
  
    if (lseek (0, 0, SEEK_CUR) == nbytes)
      {
        /* An unbuffered stdio, such as BeOS or on uClibc compiled without
           __STDIO_BUFFERS.  Or stdin is a pipe.  */
        size_t size;
        ASSERT (freadptr (stdin, &size) == NULL);
      }
    else
      {
        /* Normal buffered stdio.  */
        const char stdin_contents[] =
          "#!/bin/sh\n\n${CHECKER} ./test-freadptr${EXEEXT} 5 < \"$srcdir/test-freadptr.sh\" || exit 1\ncat \"$srcdir/test-freadptr.sh\" | ${CHECKER} ./test-freadptr${EXEEXT} 5 || exit 1\nexit 0\n";
        const char *expected = stdin_contents + nbytes;
        size_t available1;
        size_t available2;
        size_t available3;
  
        /* Test normal behaviour.  */
        {
          const char *ptr = freadptr (stdin, &available1);
  
          ASSERT (ptr != NULL);
          ASSERT (available1 != 0);
          ASSERT (available1 <= strlen (expected));
          ASSERT (memcmp (ptr, expected, available1) == 0);
        }
  
        /* Test behaviour after normal ungetc.  */
        ungetc (fgetc (stdin), stdin);
        {
          const char *ptr = freadptr (stdin, &available2);
  
          if (ptr != NULL)
            {
              ASSERT (available2 == available1);
              ASSERT (memcmp (ptr, expected, available2) == 0);
            }
        }
  
        /* Test behaviour after arbitrary ungetc.  */
        fgetc (stdin);
        ungetc ('@', stdin);
        {
          const char *ptr = freadptr (stdin, &available3);
  
          if (ptr != NULL)
            {
              ASSERT (available3 == 1 || available3 == available1);
              ASSERT (ptr[0] == '@');
              if (available3 > 1)
                {
                  ASSERT (memcmp (ptr + 1, expected + 1, available3 - 1) == 0);
                }
            }
        }
      }
  
    /* Free memory allocated during ungetc().  */
    fclose (stdin);
  
    return test_exit_status;
  }
  

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