tests/test-ftello.c

   1 /* Test of ftello() 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>, 2007.  */
  18
  19 #include <config.h>
  20
  21 /* None of the files accessed by this test are large, so disable the
  22    fseek link warning if we are not using the gnulib fseek module.  */
  23 #define _GL_NO_LARGE_FILES
  24 #include <stdio.h>
  25
  26 #include "signature.h"
  27 SIGNATURE_CHECK (ftello, off_t, (FILE *));
  28
  29 #include "binary-io.h"
  30 #include "macros.h"
  31
  32 #ifndef FUNC_UNGETC_BROKEN
  33 # define FUNC_UNGETC_BROKEN 0
  34 #endif
  35
  36 int
  37 main (int argc, _GL_UNUSED char **argv)
  38 {
  39   int ch;
  40   /* Assume stdin is seekable iff argc > 1.  */
  41   if (argc == 1)
  42     {
  43       ASSERT (ftell (stdin) == -1);
  44       ASSERT (ftello (stdin) == -1);
  45       return 0;
  46     }
  47
  48   /* mingw ftell is unreliable on text mode input.  */
  49   set_binary_mode (0, O_BINARY);
  50
  51   /* Simple tests.  For each test, make sure ftell and ftello agree.  */
  52   ASSERT (ftell (stdin) == 0);
  53   ASSERT (ftello (stdin) == 0);
  54
  55   ch = fgetc (stdin);
  56   ASSERT (ch == '#');
  57   ASSERT (ftell (stdin) == 1);
  58   ASSERT (ftello (stdin) == 1);
  59
  60   /* Test ftell after ungetc of read input.  */
  61   ch = ungetc ('#', stdin);
  62   ASSERT (ch == '#');
  63   ASSERT (ftell (stdin) == 0);
  64   ASSERT (ftello (stdin) == 0);
  65
  66   ch = fgetc (stdin);
  67   ASSERT (ch == '#');
  68   ASSERT (ftell (stdin) == 1);
  69   ASSERT (ftello (stdin) == 1);
  70
  71   /* Test ftell after fseek.  */
  72   ASSERT (fseek (stdin, 2, SEEK_SET) == 0);
  73   ASSERT (ftell (stdin) == 2);
  74   ASSERT (ftello (stdin) == 2);
  75
  76   /* Test ftell after random ungetc.  */
  77   ch = fgetc (stdin);
  78   ASSERT (ch == '/');
  79   ch = ungetc ('@', stdin);
  80   ASSERT (ch == '@');
  81   ASSERT (ftell (stdin) == 2);
  82   ASSERT (ftello (stdin) == 2);
  83
  84   ch = fgetc (stdin);
  85   ASSERT (ch == '@');
  86   ASSERT (ftell (stdin) == 3);
  87   ASSERT (ftello (stdin) == 3);
  88
  89   if (2 < argc)
  90     {
  91       if (FUNC_UNGETC_BROKEN)
  92         {
  93           if (test_exit_status != EXIT_SUCCESS)
  94             return test_exit_status;
  95           fputs ("Skipping test: ungetc cannot handle arbitrary bytes\n",
  96                  stderr);
  97           return 77;
  98         }
  99       /* Test ftell after ungetc without read.  */
 100       ASSERT (fseek (stdin, 0, SEEK_CUR) == 0);
 101       ASSERT (ftell (stdin) == 3);
 102       ASSERT (ftello (stdin) == 3);
 103
 104       ch = ungetc ('~', stdin);
 105       ASSERT (ch == '~');
 106       ASSERT (ftell (stdin) == 2);
 107       ASSERT (ftello (stdin) == 2);
 108     }
 109
 110 #if !defined __MINT__ /* FreeMiNT has problems seeking past end of file */
 111   /* Test ftell beyond end of file.  */
 112   ASSERT (fseek (stdin, 0, SEEK_END) == 0);
 113   ch = ftello (stdin);
 114   ASSERT (fseek (stdin, 10, SEEK_END) == 0);
 115   ASSERT (ftell (stdin) == ch + 10);
 116   ASSERT (ftello (stdin) == ch + 10);
 117 #endif
 118
 119   return test_exit_status;
 120 }