1 /* Retrieve information about a FILE stream.
2 Copyright (C) 2007-2008 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/>. */
23 freadptr (FILE *fp, size_t *sizep)
27 /* Keep this code in sync with freadahead! */
28 #if defined _IO_ferror_unlocked /* GNU libc, BeOS */
29 if (fp->_IO_write_ptr > fp->_IO_write_base)
31 size = fp->_IO_read_end - fp->_IO_read_ptr;
35 return (const char *) fp->_IO_read_ptr;
36 #elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
37 if ((fp->_flags & __SWR) != 0 || fp->_r < 0)
43 return (const char *) fp->_p;
44 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
45 # if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
46 # define fp_ ((struct { unsigned char *_ptr; \
47 unsigned char *_base; \
48 unsigned char *_end; \
53 if ((fp_->_flag & _IOWRT) != 0)
59 return (const char *) fp_->_ptr;
61 # if defined _SCO_DS /* OpenServer */
66 if ((fp->_flag & _IOWRT) != 0)
72 return (const char *) fp->_ptr;
74 #elif defined __UCLIBC__ /* uClibc */
75 # ifdef __STDIO_BUFFERS
76 if (fp->__modeflags & __FLAG_WRITING)
78 size = fp->__bufread - fp->__bufpos;
82 return (const char *) fp->__bufpos;
86 #elif defined __QNX__ /* QNX */
87 if ((fp->_Mode & 0x2000 /* _MWRITE */) != 0)
89 /* fp->_Buf <= fp->_Next <= fp->_Rend */
90 size = fp->_Rend - fp->_Next;
94 return (const char *) fp->_Next;
96 #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."