1 /* An fseek() function that, together with fflush(), is POSIX compliant.
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 2, or (at your option)
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 along
15 with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
23 /* Get off_t and lseek. */
32 rpl_fseeko (FILE *fp, off_t offset, int whence)
34 /* These tests are based on fpurge.c. */
35 #if defined _IO_ferror_unlocked /* GNU libc, BeOS */
36 if (fp->_IO_read_end == fp->_IO_read_ptr
37 && fp->_IO_write_ptr == fp->_IO_write_base
38 && fp->_IO_save_base == NULL)
39 #elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
40 # if defined __NetBSD__ || defined __OpenBSD__ /* NetBSD, OpenBSD */
41 /* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup>
42 and <http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> */
43 # define fp_ub ((struct { struct __sbuf _ub; } *) fp->_ext._base)->_ub
44 # else /* FreeBSD, MacOS X, Cygwin */
45 # define fp_ub fp->_ub
47 if (fp->_p == fp->_bf._base
49 && fp->_w == ((fp->_flags & (__SLBF | __SNBF | __SRD)) == 0 /* fully buffered and not currently reading? */
52 && fp_ub._base == NULL)
53 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
54 # if defined __sun && defined __sparc && defined _LP64 /* Solaris/SPARC 64-bit */
55 # define fp_ ((struct { unsigned char *_ptr; \
56 unsigned char *_base; \
57 unsigned char *_end; \
60 if (fp_->_ptr == fp_->_base
61 && (fp_->_ptr == NULL || fp_->_cnt == 0))
63 if (fp->_ptr == fp->_base
64 && (fp->_ptr == NULL || fp->_cnt == 0))
67 #error "Please port gnulib fseeko.c to your platform! Look at the code in fpurge.c, then report this to bug-gnulib."
70 off_t pos = lseek (fileno (fp), offset, whence);
73 #if defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
74 fp->_flags &= ~__SOFF;
80 #if defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
88 return fseeko (fp, offset, whence);