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/* 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 2, 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, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#include <config.h>
/* Specification. */
#include "fwritable.h"
bool
fwritable (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_WRITES) == 0;
#elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
return (fp->_flags & (__SRW | __SWR)) != 0;
#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
return (fp->_flag & (_IORW | _IOWRT)) != 0;
#elif defined __QNX__ /* QNX */
return (fp->_mode & _MOPENW) != 0;
#else
#error "Please port gnulib fwritable.c to your platform! Look at the definition of fopen, fdopen on your system, then report this to bug-gnulib."
#endif
}
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