/*******************************************************************************

	Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.

	This file is part of LibMaxsi.

	LibMaxsi 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.

	LibMaxsi 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 Public License for more
	details.

	You should have received a copy of the GNU Lesser General Public License
	along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.

	fileno.cpp
	Returns the underlying file descriptor of a FILE if applicable.

*******************************************************************************/

#include <stdio.h>
#include <errno.h>

extern "C" int fileno(FILE* fp)
{
	int result = fp->fileno_func ? fp->fileno_func(fp->user) : -1;
	if ( result < 0 ) { errno = EBADF; }
	return result;
}