glibc/libio/__freading.c
Ulrich Drepper ed36f224c3 write-only streams. For read/write streams, check whether we
performed a read operation already.
2007-10-13 07:20:46 +00:00

28 lines
1.0 KiB
C

/* Copyright (C) 2000, 2002, 2007 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#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));
}