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/* ****************************************************************************
 * stdio/seek.c -- Seek on a stream.
 * Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
 *
 * This file is part of the 'all/core' module,
 * in libcarrot, an experimental modular libc project.
 *
 * This file is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 *
 * This file 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 Lesser General Lesser Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this file.  If not, see <http://www.gnu.org/licenses/>.
 * ************************************************************************* */
#include "stdio.h"

/**
 *	fseek:
 *	Seek on a FILE stream.
 *
 *	@arg	stream	the stream.
 *	@arg	offset	the offset to seek.
 *	@arg	whence	the whence.
 *	@return			0 for a success, -1 for an error.
 */

int fseek(FILE *stream, long offset, int whence)
{
	/* check if we can seek */
	if (!stream->seek) return (-1);

	/* seek */
	if ((*stream->seek)(stream->cookie, &offset, whence) < 0)
		return (-1);

	/* update offset and return */
	stream->offset = offset;
	return (0);
}

/**
 *	ftell:
 *	Get the current offset in a FILE stream.
 *
 *	@arg	stream	the stream.
 *	@return			the offset.
 */

long ftell(FILE *stream)
{
	/* return the offset */
	return (stream->offset);
}