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/* fseeko.c -- an implementation of fseek() with an off_t argument.
Copyright (C) 2003, 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 2, 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. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <sys/types.h>
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifndef LONG_MAX
#define LONG_MAX ((long) ((unsigned long) ~0 >> 1))
#endif
#ifndef LONG_MIN
#define LONG_MIN (-1 - LONG_MAX)
#endif
/*
* A replacement/substitute for fseeko, for hosts that don't have it.
*/
int
fseeko (FILE *stream, off_t offset, int whence)
{
while (offset != (long) offset)
{
long pos = (offset < 0) ? LONG_MIN : LONG_MAX;
if (fseek (stream, pos, whence) != 0)
return -1;
offset -= pos;
whence = SEEK_CUR;
}
return fseek (stream, (long) offset, whence);
}
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