1 /* An fseeko() 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 verify (sizeof (off_t) == sizeof (long));
36 rpl_fseeko (FILE *fp, off_t offset, int whence)
39 /* mingw gives bogus answers rather than failure on non-seekable files. */
40 if (lseek (fileno (fp), 0, SEEK_CUR) == -1)
44 /* These tests are based on fpurge.c. */
45 #if defined _IO_ferror_unlocked /* GNU libc, BeOS */
46 if (fp->_IO_read_end == fp->_IO_read_ptr
47 && fp->_IO_write_ptr == fp->_IO_write_base
48 && fp->_IO_save_base == NULL)
49 #elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
50 # if defined __NetBSD__ || defined __OpenBSD__ /* NetBSD, OpenBSD */
51 /* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup>
52 and <http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> */
53 # define fp_ub ((struct { struct __sbuf _ub; } *) fp->_ext._base)->_ub
54 # else /* FreeBSD, MacOS X, Cygwin */
55 # define fp_ub fp->_ub
57 # if defined __SL64 && defined __SCLE /* Cygwin */
58 if ((fp->_flags & __SL64) == 0)
60 /* Cygwin 1.5.0 through 1.5.24 failed to open stdin in 64-bit
61 mode; but has an fseeko that requires 64-bit mode. */
62 FILE *tmp = fopen ("/dev/null", "r");
66 fp->_seek64 = tmp->_seek64;
70 if (fp->_p == fp->_bf._base
72 && fp->_w == ((fp->_flags & (__SLBF | __SNBF | __SRD)) == 0 /* fully buffered and not currently reading? */
75 && fp_ub._base == NULL)
76 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
77 # if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
78 # define fp_ ((struct { unsigned char *_ptr; \
79 unsigned char *_base; \
80 unsigned char *_end; \
85 if (fp_->_ptr == fp_->_base
86 && (fp_->_ptr == NULL || fp_->_cnt == 0))
88 if (fp->_ptr == fp->_base
89 && (fp->_ptr == NULL || fp->_cnt == 0))
91 #elif defined __UCLIBC__ /* uClibc */
92 if (((fp->__modeflags & __FLAG_WRITING) == 0
93 || fp->__bufpos == fp->__bufstart)
94 && ((fp->__modeflags & (__FLAG_READONLY | __FLAG_READING)) == 0
95 || fp->__bufpos == fp->__bufread))
96 #elif defined __QNX__ /* QNX */
97 if ((fp->_Mode & _MWRITE ? fp->_Next == fp->_Buf : fp->_Next == fp->_Rend)
98 && fp->_Rback == fp->_Back + sizeof (fp->_Back)
99 && fp->_Rsave == NULL)
101 #error "Please port gnulib fseeko.c to your platform! Look at the code in fpurge.c, then report this to bug-gnulib."
104 off_t pos = lseek (fileno (fp), offset, whence);
107 #if defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
108 fp->_flags &= ~__SOFF;
114 #if defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
116 fp->_flags |= __SOFF;
117 fp->_flags &= ~__SEOF;
118 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
119 fp->_flag &= ~_IOEOF;
125 return fseeko (fp, offset, whence);