/* Test of ftell() function.
   Copyright (C) 2007, 2008 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>, 2007.  */

#include <config.h>

#include <stdio.h>
#include <stdlib.h>

#include "binary-io.h"

#define ASSERT(expr) \
  do									     \
    {									     \
      if (!(expr))							     \
        {								     \
          fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
          abort ();							     \
        }								     \
    }									     \
  while (0)

int
main (int argc, char **argv)
{
  int ch;
  /* Assume stdin is seekable iff argc > 1.  */
  if (argc == 1)
    {
      ASSERT (ftell (stdin) == -1);
      return 0;
    }

  /* mingw ftell is unreliable on text mode input.  */
  SET_BINARY (0);

  /* Simple tests.  */
  ASSERT (ftell (stdin) == 0);

  ch = fgetc (stdin);
  ASSERT (ch == '#');
  ASSERT (ftell (stdin) == 1);

  /* Test ftell after ungetc of read input.  */
  ch = ungetc ('#', stdin);
  ASSERT (ch == '#');
  ASSERT (ftell (stdin) == 0);

  ch = fgetc (stdin);
  ASSERT (ch == '#');
  ASSERT (ftell (stdin) == 1);

  /* Test ftell after fseek.  */
  ASSERT (fseek (stdin, 2, SEEK_SET) == 0);
  ASSERT (ftell (stdin) == 2);

  /* Test ftell after random ungetc.  */
  ch = fgetc (stdin);
  ASSERT (ch == '/');
  ch = ungetc ('@', stdin);
  ASSERT (ch == '@');
  ASSERT (ftell (stdin) == 2);

  ch = fgetc (stdin);
  ASSERT (ch == '@');
  ASSERT (ftell (stdin) == 3);

  /* Test ftell after ungetc without read.  */
  ASSERT (fseek (stdin, 0, SEEK_CUR) == 0);
  ASSERT (ftell (stdin) == 3);

  ch = ungetc ('~', stdin);
  ASSERT (ch == '~');
  ASSERT (ftell (stdin) == 2);

  /* Test ftell beyond end of file.  */
  ASSERT (fseek (stdin, 0, SEEK_END) == 0);
  ch = ftell (stdin);
  ASSERT (fseek (stdin, 10, SEEK_END) == 0);
  ASSERT (ftell (stdin) == ch + 10);

  return 0;
}