glibc/libio/__freading.c

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/* Copyright (C) 2000-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU 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 2.1 of the License, or (at your option) any later version.
The GNU 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 GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <stdio_ext.h>
int
__freading (FILE *fp)
{
return ((fp->_flags & _IO_NO_WRITES)
|| ((fp->_flags & (_IO_CURRENTLY_PUTTING | _IO_NO_READS)) == 0
&& fp->_IO_read_base != NULL));
}