1 /* Retrieve information about a FILE stream.
2 Copyright (C) 2007 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/>. */
20 #include "freadahead.h"
25 #if defined _IO_ferror_unlocked /* GNU libc, BeOS */
26 if (fp->_IO_write_ptr > fp->_IO_write_base)
28 return fp->_IO_read_end - fp->_IO_read_ptr;
29 #elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
30 if ((fp->_flags & __SWR) != 0 || fp->_r < 0)
33 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
34 # if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
35 # define fp_ ((struct { unsigned char *_ptr; \
36 unsigned char *_base; \
37 unsigned char *_end; \
42 if ((fp_->_flag & _IOWRT) != 0)
46 if ((fp->_flag & _IOWRT) != 0)
50 #elif defined __UCLIBC__ /* uClibc */
51 # ifdef __STDIO_BUFFERS
52 if (fp->__modeflags & __FLAG_WRITING)
54 return fp->__bufread - fp->__bufpos;
58 #elif defined __QNX__ /* QNX */
59 if ((fp->_Mode & 0x2000 /* _MWRITE */) != 0)
61 /* fp->_Buf <= fp->_Next <= fp->_Rend */
62 return fp->_Rend - fp->_Next;
64 #error "Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread on your system, then report this to bug-gnulib."