/* Retrieve information about a FILE stream.
Copyright (C) 2007 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "fwriting.h"
bool
fwriting (FILE *fp)
{
/* Most systems provide FILE as a struct and the necessary bitmask in
<stdio.h>, because they need it for implementing getc() and putc() as
fast macros. */
#if defined _IO_ferror_unlocked /* GNU libc, BeOS */
return (fp->_flags & (_IO_NO_READS | _IO_CURRENTLY_PUTTING)) != 0;
#elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
return (fp->_flags & __SWR) != 0;
#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
return (fp->_flag & _IOWRT) != 0;
#elif defined __UCLIBC__ /* uClibc */
return (fp->__modeflags & __FLAG_WRITING) != 0;
#elif defined __QNX__ /* QNX */
return ((fp->_Mode & 0x1 /* _MOPENR */) == 0
|| (fp->_Mode & 0x2000 /* _MWRITE */) != 0);
#else
#error "Please port gnulib fwriting.c to your platform!"
#endif
}
