1 /* Retrieve information about a FILE stream.
2 Copyright (C) 2007-2010 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/>. */
24 #include "stdio-impl.h"
27 freadptr (FILE *fp, size_t *sizep)
31 /* Keep this code in sync with freadahead! */
32 #if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
33 if (fp->_IO_write_ptr > fp->_IO_write_base)
35 size = fp->_IO_read_end - fp->_IO_read_ptr;
39 return (const char *) fp->_IO_read_ptr;
40 #elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
41 if ((fp_->_flags & __SWR) != 0 || fp_->_r < 0)
47 return (const char *) fp_->_p;
48 #elif defined __EMX__ /* emx+gcc */
49 if ((fp->_flags & _IOWRT) != 0)
51 /* Note: fp->_ungetc_count > 0 implies fp->_rcount <= 0,
52 fp->_ungetc_count = 0 implies fp->_rcount >= 0. */
55 if (!(fp->_ungetc_count == 0))
59 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
60 if ((fp_->_flag & _IOWRT) != 0)
66 return (const char *) fp_->_ptr;
67 #elif defined __UCLIBC__ /* uClibc */
68 # ifdef __STDIO_BUFFERS
69 if (fp->__modeflags & __FLAG_WRITING)
71 size = fp->__bufread - fp->__bufpos;
75 return (const char *) fp->__bufpos;
79 #elif defined __QNX__ /* QNX */
80 if ((fp->_Mode & 0x2000 /* _MWRITE */) != 0)
82 /* fp->_Buf <= fp->_Next <= fp->_Rend */
83 size = fp->_Rend - fp->_Next;
87 return (const char *) fp->_Next;
88 #elif defined __MINT__ /* Atari FreeMiNT */
89 if (!fp->__mode.__read)
91 size = fp->__get_limit - fp->__bufp;
96 #elif defined SLOW_BUT_NO_HACKS /* users can define this */
97 /* This implementation is correct on any ANSI C platform. It is just
101 #error "Please port gnulib freadptr.c to your platform! Look at the definition of fflush, fread, getc, getc_unlocked on your system, then report this to bug-gnulib."