1 /* Retrieve information about a FILE stream.
2 Copyright (C) 2007-2011 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "stdio-impl.h"
24 /* Don't use glibc's __freading function in glibc < 2.7, see
25 <http://sourceware.org/bugzilla/show_bug.cgi?id=4359> */
26 #if !(HAVE___FREADING && (!defined __GLIBC__ || defined __UCLIBC__ || __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7)))
31 /* Most systems provide FILE as a struct and the necessary bitmask in
32 <stdio.h>, because they need it for implementing getc() and putc() as
34 #if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
35 return ((fp->_flags & _IO_NO_WRITES) != 0
36 || ((fp->_flags & (_IO_NO_READS | _IO_CURRENTLY_PUTTING)) == 0
37 && fp->_IO_read_base != NULL));
38 #elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
39 return (fp_->_flags & __SRD) != 0;
40 #elif defined __EMX__ /* emx+gcc */
41 return (fp->_flags & _IOREAD) != 0;
42 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, NonStop Kernel */
43 # if defined __sun /* Solaris */
44 return (fp->_flag & _IOREAD) != 0 && (fp->_flag & _IOWRT) == 0;
46 return (fp->_flag & _IOREAD) != 0;
48 #elif defined __UCLIBC__ /* uClibc */
49 return (fp->__modeflags & (__FLAG_READONLY | __FLAG_READING)) != 0;
50 #elif defined __QNX__ /* QNX */
51 return ((fp->_Mode & 0x2 /* _MOPENW */) == 0
52 || (fp->_Mode & 0x1000 /* _MREAD */) != 0);
53 #elif defined __MINT__ /* Atari FreeMiNT */
54 if (!fp->__mode.__write)
56 if (!fp->__mode.__read)
58 # ifdef _IO_CURRENTLY_GETTING /* Flag added on 2009-02-28 */
59 return (fp->__flags & _IO_CURRENTLY_GETTING) != 0;
61 return (fp->__buffer < fp->__get_limit /*|| fp->__bufp == fp->__put_limit ??*/);
64 #error "Please port gnulib freading.c to your platform!"