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/* Retrieve information about a FILE stream.
Copyright (C) 2007-2008 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 "freading.h"
#include "stdio-impl.h"
/* Don't use glibc's __freading function in glibc < 2.7, see
<http://sourceware.org/bugzilla/show_bug.cgi?id=4359> */
#if !(HAVE___FREADING && (!defined __GLIBC__ || __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7)))
bool
freading (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_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Linux libc5 */
return ((fp->_flags & _IO_NO_WRITES) != 0
|| ((fp->_flags & (_IO_NO_READS | _IO_CURRENTLY_PUTTING)) == 0
&& fp->_IO_read_base != NULL));
#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
return (fp_->_flags & __SRD) != 0;
#elif defined __EMX__ /* emx+gcc */
return (fp->_flags & _IOREAD) != 0;
#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
return (fp->_flag & _IOREAD) != 0;
#elif defined __UCLIBC__ /* uClibc */
return (fp->__modeflags & (__FLAG_READONLY | __FLAG_READING)) != 0;
#elif defined __QNX__ /* QNX */
return ((fp->_Mode & 0x2 /* _MOPENW */) == 0
|| (fp->_Mode & 0x1000 /* _MREAD */) != 0);
#else
#error "Please port gnulib freading.c to your platform!"
#endif
}
#endif
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