1/* Retrieve information about a FILE stream. 2 Copyright (C) 2007-2010 Free Software Foundation, Inc. 3 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. 8 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. 13 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/>. */ 16 17#include <config.h> 18 19/* Specification. */ 20#include "freading.h" 21 22#include "stdio-impl.h" 23 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__ || __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))) 27 28bool 29freading (FILE *fp) 30{ 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 33 fast macros. */ 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 */ 43 return (fp->_flag & _IOREAD) != 0; 44#elif defined __UCLIBC__ /* uClibc */ 45 return (fp->__modeflags & (__FLAG_READONLY | __FLAG_READING)) != 0; 46#elif defined __QNX__ /* QNX */ 47 return ((fp->_Mode & 0x2 /* _MOPENW */) == 0 48 || (fp->_Mode & 0x1000 /* _MREAD */) != 0); 49#elif defined __MINT__ /* Atari FreeMiNT */ 50 if (!fp->__mode.__write) 51 return 1; 52 if (!fp->__mode.__read) 53 return 0; 54# ifdef _IO_CURRENTLY_GETTING /* Flag added on 2009-02-28 */ 55 return (fp->__flags & _IO_CURRENTLY_GETTING) != 0; 56# else 57 return (fp->__buffer < fp->__get_limit /*|| fp->__bufp == fp->__put_limit ??*/); 58# endif 59#else 60 #error "Please port gnulib freading.c to your platform!" 61#endif 62} 63 64#endif 65