/* Test of ftello() function.

   Copyright (C) 2007-2020 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 <https://www.gnu.org/licenses/>.  */

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

#include <config.h>

/* None of the files accessed by this test are large, so disable the

   fseek link warning if we are not using the gnulib fseek module.  */

#define _GL_NO_LARGE_FILES

#include <stdio.h>

#include "signature.h"

SIGNATURE_CHECK (ftello, off_t, (FILE *));

#include "binary-io.h"

#include "macros.h"

#ifndef FUNC_UNGETC_BROKEN

# define FUNC_UNGETC_BROKEN 0

#endif

int

main (int argc, char **argv _GL_UNUSED)

{

  int ch;

  /* Assume stdin is seekable iff argc > 1.  */

  if (argc == 1)

    {

      ASSERT (ftell (stdin) == -1);

      ASSERT (ftello (stdin) == -1);

      return 0;

    }

  /* mingw ftell is unreliable on text mode input.  */

  set_binary_mode (0, O_BINARY);

  /* Simple tests.  For each test, make sure ftell and ftello agree.  */

  ASSERT (ftell (stdin) == 0);

  ASSERT (ftello (stdin) == 0);

  ch = fgetc (stdin);

  ASSERT (ch == '#');

  ASSERT (ftell (stdin) == 1);

  ASSERT (ftello (stdin) == 1);

  /* Test ftell after ungetc of read input.  */

  ch = ungetc ('#', stdin);

  ASSERT (ch == '#');

  ASSERT (ftell (stdin) == 0);

  ASSERT (ftello (stdin) == 0);

  ch = fgetc (stdin);

  ASSERT (ch == '#');

  ASSERT (ftell (stdin) == 1);

  ASSERT (ftello (stdin) == 1);

  /* Test ftell after fseek.  */

  ASSERT (fseek (stdin, 2, SEEK_SET) == 0);

  ASSERT (ftell (stdin) == 2);

  ASSERT (ftello (stdin) == 2);

  /* Test ftell after random ungetc.  */

  ch = fgetc (stdin);

  ASSERT (ch == '/');

  ch = ungetc ('@', stdin);

  ASSERT (ch == '@');

  ASSERT (ftell (stdin) == 2);

  ASSERT (ftello (stdin) == 2);

  ch = fgetc (stdin);

  ASSERT (ch == '@');

  ASSERT (ftell (stdin) == 3);

  ASSERT (ftello (stdin) == 3);

  if (2 < argc)

    {

      if (FUNC_UNGETC_BROKEN)

        {

          fputs ("Skipping test: ungetc cannot handle arbitrary bytes\n",

                 stderr);

          return 77;

        }

      /* Test ftell after ungetc without read.  */

      ASSERT (fseek (stdin, 0, SEEK_CUR) == 0);

      ASSERT (ftell (stdin) == 3);

      ASSERT (ftello (stdin) == 3);

      ch = ungetc ('~', stdin);

      ASSERT (ch == '~');

      ASSERT (ftell (stdin) == 2);

      ASSERT (ftello (stdin) == 2);

    }

#if !defined __MINT__ /* FreeMiNT has problems seeking past end of file */

  /* Test ftell beyond end of file.  */

  ASSERT (fseek (stdin, 0, SEEK_END) == 0);

  ch = ftello (stdin);

  ASSERT (fseek (stdin, 10, SEEK_END) == 0);

  ASSERT (ftell (stdin) == ch + 10);

  ASSERT (ftello (stdin) == ch + 10);

#endif

  return 0;

}