tests/test-freadptr.c

   1 /* Test of freadptr() function.
   2    Copyright (C) 2007-2019 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>, 2008.  */
  18
  19 #include <config.h>
  20
  21 #include "freadptr.h"
  22
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26
  27 #include "macros.h"
  28
  29 int
  30 main (int argc, char **argv)
  31 {
  32   int nbytes = atoi (argv[1]);
  33   void *buf = malloc (nbytes);
  34   ASSERT (fread (buf, 1, nbytes, stdin) == nbytes);
  35
  36   if (lseek (0, 0, SEEK_CUR) == nbytes)
  37     {
  38       /* An unbuffered stdio, such as BeOS or on uClibc compiled without
  39          __STDIO_BUFFERS.  Or stdin is a pipe.  */
  40       size_t size;
  41       ASSERT (freadptr (stdin, &size) == NULL);
  42     }
  43   else
  44     {
  45       /* Normal buffered stdio.  */
  46       const char stdin_contents[] =
  47         "#!/bin/sh\n\n./test-freadptr${EXEEXT} 5 < \"$srcdir/test-freadptr.sh\" || exit 1\ncat \"$srcdir/test-freadptr.sh\" | ./test-freadptr${EXEEXT} 5 || exit 1\nexit 0\n";
  48       const char *expected = stdin_contents + nbytes;
  49       size_t available1;
  50       size_t available2;
  51       size_t available3;
  52
  53       /* Test normal behaviour.  */
  54       {
  55         const char *ptr = freadptr (stdin, &available1);
  56
  57         ASSERT (ptr != NULL);
  58         ASSERT (available1 != 0);
  59         ASSERT (available1 <= strlen (expected));
  60         ASSERT (memcmp (ptr, expected, available1) == 0);
  61       }
  62
  63       /* Test behaviour after normal ungetc.  */
  64       ungetc (fgetc (stdin), stdin);
  65       {
  66         const char *ptr = freadptr (stdin, &available2);
  67
  68         if (ptr != NULL)
  69           {
  70             ASSERT (available2 == available1);
  71             ASSERT (memcmp (ptr, expected, available2) == 0);
  72           }
  73       }
  74
  75       /* Test behaviour after arbitrary ungetc.  */
  76       fgetc (stdin);
  77       ungetc ('@', stdin);
  78       {
  79         const char *ptr = freadptr (stdin, &available3);
  80
  81         if (ptr != NULL)
  82           {
  83             ASSERT (available3 == 1 || available3 == available1);
  84             ASSERT (ptr[0] == '@');
  85             if (available3 > 1)
  86               {
  87                 ASSERT (memcmp (ptr + 1, expected + 1, available3 - 1) == 0);
  88               }
  89           }
  90       }
  91     }
  92
  93   return 0;
  94 }