sortix--sortix/libc/stdio_ext/__freading.c

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

    Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014, 2015.

    This file is part of the Sortix C Library.

    The Sortix C Library 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.

    The Sortix C Library 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 the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.

    stdio_ext/__freading.c
    Returns whether the last operation was a read or FILE is read only.

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

#include <stdio.h>
#include <stdio_ext.h>

int __freading(FILE* fp)
{
	int result = 0;
	flockfile(fp);
	if ( fp->flags & _FILE_LAST_READ )
		result = 1;
	else if ( (fp->flags & _FILE_READABLE) && !(fp->flags & _FILE_WRITABLE) )
		result = 1;
	funlockfile(fp);
	return result;
}