1  /* Test of ftello() 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 (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            fputs ("Skipping test: ungetc cannot handle arbitrary bytes\n",
      94                   stderr);
      95            return 77;
      96          }
      97        /* Test ftell after ungetc without read.  */
      98        ASSERT (fseek (stdin, 0, SEEK_CUR) == 0);
      99        ASSERT (ftell (stdin) == 3);
     100        ASSERT (ftello (stdin) == 3);
     101  
     102        ch = ungetc ('~', stdin);
     103        ASSERT (ch == '~');
     104        ASSERT (ftell (stdin) == 2);
     105        ASSERT (ftello (stdin) == 2);
     106      }
     107  
     108  #if !defined __MINT__ /* FreeMiNT has problems seeking past end of file */
     109    /* Test ftell beyond end of file.  */
     110    ASSERT (fseek (stdin, 0, SEEK_END) == 0);
     111    ch = ftello (stdin);
     112    ASSERT (fseek (stdin, 10, SEEK_END) == 0);
     113    ASSERT (ftell (stdin) == ch + 10);
     114    ASSERT (ftello (stdin) == ch + 10);
     115  #endif
     116  
     117    return 0;
     118  }