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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);
}
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