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/* An fseeko() function that, together with fflush(), is POSIX compliant.
Copyright (C) 2007 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#include <config.h>
/* Specification. */
#include <stdio.h>
/* Get off_t and lseek. */
#include <unistd.h>
#undef fseeko
#if !HAVE_FSEEKO
# undef fseek
# define fseeko fseek
#endif
int
rpl_fseeko (FILE *fp, off_t offset, int whence)
{
#if LSEEK_PIPE_BROKEN
/* mingw gives bogus answers rather than failure on non-seekable files. */
if (lseek (fileno (fp), 0, SEEK_CUR) == -1)
return EOF;
#endif
/* These tests are based on fpurge.c. */
#if defined _IO_ferror_unlocked /* GNU libc, BeOS */
if (fp->_IO_read_end == fp->_IO_read_ptr
&& fp->_IO_write_ptr == fp->_IO_write_base
&& fp->_IO_save_base == NULL)
#elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
# if defined __NetBSD__ || defined __OpenBSD__ /* NetBSD, OpenBSD */
/* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup>
and <http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> */
# define fp_ub ((struct { struct __sbuf _ub; } *) fp->_ext._base)->_ub
# else /* FreeBSD, MacOS X, Cygwin */
# define fp_ub fp->_ub
# endif
# if defined __SL64 && defined __SCLE /* Cygwin */
if ((fp->_flags & __SL64) == 0)
{
/* Cygwin 1.5.0 through 1.5.24 failed to open stdin in 64-bit
mode; but has an fseeko that requires 64-bit mode. */
FILE *tmp = fopen ("/dev/null", "r");
if (!tmp)
return -1;
fp->_flags |= __SL64;
fp->_seek64 = tmp->_seek64;
fclose (tmp);
}
# endif
if (fp->_p == fp->_bf._base
&& fp->_r == 0
&& fp->_w == ((fp->_flags & (__SLBF | __SNBF | __SRD)) == 0 /* fully buffered and not currently reading? */
? fp->_bf._size
: 0)
&& fp_ub._base == NULL)
#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
# if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
# define fp_ ((struct { unsigned char *_ptr; \
unsigned char *_base; \
unsigned char *_end; \
long _cnt; \
int _file; \
unsigned int _flag; \
} *) fp)
if (fp_->_ptr == fp_->_base
&& (fp_->_ptr == NULL || fp_->_cnt == 0))
# else
if (fp->_ptr == fp->_base
&& (fp->_ptr == NULL || fp->_cnt == 0))
# endif
#elif defined __UCLIBC__ /* uClibc */
if (((fp->__modeflags & __FLAG_WRITING) == 0
|| fp->__bufpos == fp->__bufstart)
&& ((fp->__modeflags & (__FLAG_READONLY | __FLAG_READING)) == 0
|| fp->__bufpos == fp->__bufread))
#else
#error "Please port gnulib fseeko.c to your platform! Look at the code in fpurge.c, then report this to bug-gnulib."
#endif
{
off_t pos = lseek (fileno (fp), offset, whence);
if (pos == -1)
{
#if defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
fp->_flags &= ~__SOFF;
#endif
return -1;
}
else
{
#if defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
fp->_offset = pos;
fp->_flags |= __SOFF;
#endif
return 0;
}
}
else
return fseeko (fp, offset, whence);
}
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