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/>. */
20 #include "freadahead.h"
25 #if defined _IO_ferror_unlocked || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Linux libc5 */
26 if (fp->_IO_write_ptr > fp->_IO_write_base)
28 return (fp->_IO_read_end - fp->_IO_read_ptr)
29 + (fp->_flags & _IO_IN_BACKUP ? fp->_IO_save_end - fp->_IO_save_base :
31 #elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
32 # if defined __NetBSD__ || defined __OpenBSD__
35 struct __sbuf _ub; /* ungetc buffer */
36 /* More fields, not relevant here. */
38 # define HASUB(fp) (((struct __sfileext *) (fp)->_ext._base)->_ub._base != NULL)
40 # define HASUB(fp) ((fp)->_ub._base != NULL)
42 if ((fp->_flags & __SWR) != 0 || fp->_r < 0)
45 + (HASUB (fp) ? fp->_ur : 0);
46 #elif defined __EMX__ /* emx+gcc */
47 if ((fp->_flags & _IOWRT) != 0)
49 /* Note: fp->_ungetc_count > 0 implies fp->_rcount <= 0,
50 fp->_ungetc_count = 0 implies fp->_rcount >= 0. */
52 (fp->_ungetc_count == 0 ? fp->_rcount : fp->_ungetc_count - fp->_rcount) */
53 return (fp->_rcount > 0 ? fp->_rcount : fp->_ungetc_count - fp->_rcount);
54 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
55 # if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
56 # define fp_ ((struct { unsigned char *_ptr; \
57 unsigned char *_base; \
58 unsigned char *_end; \
63 if ((fp_->_flag & _IOWRT) != 0)
67 # if defined _SCO_DS /* OpenServer */
71 if ((fp->_flag & _IOWRT) != 0)
75 #elif defined __UCLIBC__ /* uClibc */
76 # ifdef __STDIO_BUFFERS
77 if (fp->__modeflags & __FLAG_WRITING)
79 return (fp->__bufread - fp->__bufpos)
80 + (fp->__modeflags & __FLAG_UNGOT ? 1 : 0);
84 #elif defined __QNX__ /* QNX */
85 if ((fp->_Mode & 0x2000 /* _MWRITE */) != 0)
87 /* fp->_Buf <= fp->_Next <= fp->_Rend,
88 and fp->_Rend may be overridden by fp->_Rsave. */
89 return ((fp->_Rsave ? fp->_Rsave : fp->_Rend) - fp->_Next)
90 + (fp->_Mode & 0x4000 /* _MBYTE */
91 ? (fp->_Back + sizeof (fp->_Back)) - fp->_Rback
94 #error "Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread, ungetc on your system, then report this to bug-gnulib."