tests/test-freadseek.c

   1 /* Test of freadseek() function.
   2    Copyright (C) 2007-2024 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 "freadseek.h"
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27
  28 #include "macros.h"
  29
  30 int
  31 main (int argc, char **argv)
  32 {
  33   static const char stdin_contents[] =
  34     "#!/bin/sh\n\n${CHECKER} ./test-freadseek${EXEEXT} 5 19 6 7 18 9 19 < \"$srcdir/test-freadseek.sh\" || exit 1\ncat \"$srcdir/test-freadseek.sh\" | ${CHECKER} ./test-freadseek${EXEEXT} 5 19 6 7 18 9 19 || exit 1\nexit 0\n";
  35   int nbytes1 = atoi (argv[1]);
  36   int nbytes2 = atoi (argv[2]);
  37   int nbytes3 = atoi (argv[3]);
  38   int nbytes4 = atoi (argv[4]);
  39   int nbytes5 = atoi (argv[5]);
  40   int nbytes6 = atoi (argv[6]);
  41   int nbytes7 = atoi (argv[7]);
  42   void *buf1 = malloc (nbytes1);
  43   void *buf3 = malloc (nbytes3);
  44   void *buf5 = malloc (nbytes5);
  45   void *buf7 = malloc (nbytes7);
  46   /* A private variable to keep track of the position.  */
  47   size_t position = 0;
  48
  49   ASSERT (fread (buf1, 1, nbytes1, stdin) == nbytes1);
  50   ASSERT (memcmp (buf1, stdin_contents + position, nbytes1) == 0);
  51   position += nbytes1;
  52
  53   /* Test normal behaviour.  */
  54   ASSERT (freadseek (stdin, nbytes2) == 0);
  55   position += nbytes2;
  56
  57   ASSERT (fread (buf3, 1, nbytes3, stdin) == nbytes3);
  58   ASSERT (memcmp (buf3, stdin_contents + position, nbytes3) == 0);
  59   position += nbytes3;
  60
  61   /* Test behaviour after normal ungetc.  */
  62   ungetc (fgetc (stdin), stdin);
  63   ASSERT (freadseek (stdin, nbytes4) == 0);
  64   position += nbytes4;
  65
  66   ASSERT (fread (buf5, 1, nbytes5, stdin) == nbytes5);
  67   ASSERT (memcmp (buf5, stdin_contents + position, nbytes5) == 0);
  68   position += nbytes5;
  69
  70   /* Test behaviour after arbitrary ungetc.  */
  71   fgetc (stdin);
  72   ungetc ('@', stdin);
  73   ASSERT (freadseek (stdin, nbytes6) == 0);
  74   position += nbytes6;
  75
  76   ASSERT (fread (buf7, 1, nbytes7, stdin) == nbytes7);
  77   ASSERT (memcmp (buf7, stdin_contents + position, nbytes7) == 0);
  78   position += nbytes7;
  79
  80   /* Test move to end of file.  */
  81   ASSERT (freadseek (stdin, strlen (stdin_contents) - position) == 0);
  82   ASSERT (fgetc (stdin) == EOF);
  83   ASSERT (!ferror (stdin));
  84
  85 #if !defined __MINT__ /* FreeMiNT has problems seeking past end of file */
  86   /* Test move beyond end of file.  */
  87   ASSERT (freadseek (stdin, 1000000) == 0);
  88   ASSERT (fgetc (stdin) == EOF);
  89   ASSERT (!ferror (stdin));
  90 #endif
  91
  92   free (buf7);
  93   free (buf5);
  94   free (buf3);
  95   free (buf1);
  96
  97   return test_exit_status;
  98 }