1  /* Test of ftell() function.
       2     Copyright (C) 2007-2023 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 (ftell, long, (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, 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        return 0;
      45      }
      46  
      47    /* mingw ftell is unreliable on text mode input.  */
      48    set_binary_mode (0, O_BINARY);
      49  
      50    /* Simple tests.  */
      51    ASSERT (ftell (stdin) == 0);
      52  
      53    ch = fgetc (stdin);
      54    ASSERT (ch == '#');
      55    ASSERT (ftell (stdin) == 1);
      56  
      57    /* Test ftell after ungetc of read input.  */
      58    ch = ungetc ('#', stdin);
      59    ASSERT (ch == '#');
      60    ASSERT (ftell (stdin) == 0);
      61  
      62    ch = fgetc (stdin);
      63    ASSERT (ch == '#');
      64    ASSERT (ftell (stdin) == 1);
      65  
      66    /* Test ftell after fseek.  */
      67    ASSERT (fseek (stdin, 2, SEEK_SET) == 0);
      68    ASSERT (ftell (stdin) == 2);
      69  
      70    /* Test ftell after random ungetc.  */
      71    ch = fgetc (stdin);
      72    ASSERT (ch == '/');
      73    ch = ungetc ('@', stdin);
      74    ASSERT (ch == '@');
      75    ASSERT (ftell (stdin) == 2);
      76  
      77    ch = fgetc (stdin);
      78    ASSERT (ch == '@');
      79    ASSERT (ftell (stdin) == 3);
      80  
      81    if (2 < argc)
      82      {
      83        if (FUNC_UNGETC_BROKEN)
      84          {
      85            fputs ("Skipping test: ungetc cannot handle arbitrary bytes\n",
      86                   stderr);
      87            return 77;
      88          }
      89        /* Test ftell after ungetc without read.  */
      90        ASSERT (fseek (stdin, 0, SEEK_CUR) == 0);
      91        ASSERT (ftell (stdin) == 3);
      92  
      93        ch = ungetc ('~', stdin);
      94        ASSERT (ch == '~');
      95        ASSERT (ftell (stdin) == 2);
      96      }
      97  
      98  #if !defined __MINT__ /* FreeMiNT has problems seeking past end of file */
      99    /* Test ftell beyond end of file.  */
     100    ASSERT (fseek (stdin, 0, SEEK_END) == 0);
     101    ch = ftell (stdin);
     102    ASSERT (fseek (stdin, 10, SEEK_END) == 0);
     103    ASSERT (ftell (stdin) == ch + 10);
     104  #endif
     105  
     106    return 0;
     107  }