/*
 * fseeko64.c
 *
 * Seek to 64-offset within a file stream; uses same reference bases
 * as fseek(), but offset is an implementation specific __off64_t type.
 *
 * $Id: fseeko64.c,v 3368f11277e5 2015/12/31 21:20:24 keithmarshall $
 *
 * Written by Kees Zeelenberg <kzlg@users.sourceforge.net>
 * and Danny Smith <dannysmith@users.sourceforge.net>
 * Copyright (C) 2004, 2005, 2015, MinGW.org Project
 *
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice, this permission notice, and the following
 * disclaimer shall be included in all copies or substantial portions of
 * the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OF OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 */
#include <io.h>
#include <stdio.h>
#include <errno.h>

int __cdecl
fseeko64 (FILE* stream, __off64_t offset, int whence)
{
  fpos_t pos;
  if (whence == SEEK_CUR)
    {
      /* If stream is invalid, fgetpos sets errno. */
      if (fgetpos (stream, &pos))
        return (-1);
      pos += (fpos_t)(offset);
    }
  else if (whence == SEEK_END)
    {
      /* If writing, we need to flush before getting file length.  */
      fflush (stream);
      pos = (fpos_t)(_filelengthi64 (_fileno (stream)) + offset);
    }
  else if (whence == SEEK_SET)
    pos = (fpos_t)(offset);
  else
    {
      errno = EINVAL;
      return (-1);
    }
  return fsetpos (stream, &pos);
}

/* $RCSfile: fseeko64.c,v $: end of file */
