mirror of https://github.com/moparisthebest/wget
114 lines
3.8 KiB
C
114 lines
3.8 KiB
C
/* An fseeko() function that, together with fflush(), is POSIX compliant.
|
|
Copyright (C) 2007-2008 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 3, 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>
|
|
|
|
#include "stdio-impl.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_LIBRARY__ == 1 /* GNU libc, BeOS, Linux libc5 */
|
|
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 || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
|
|
# 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 __EMX__ /* emx+gcc */
|
|
if (fp->_ptr == fp->_buffer
|
|
&& fp->_rcount == 0
|
|
&& fp->_wcount == 0
|
|
&& fp->_ungetc_count == 0)
|
|
#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
|
|
if (fp_->_ptr == fp_->_base
|
|
&& (fp_->_ptr == NULL || fp_->_cnt == 0))
|
|
#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))
|
|
#elif defined __QNX__ /* QNX */
|
|
if ((fp->_Mode & _MWRITE ? fp->_Next == fp->_Buf : fp->_Next == fp->_Rend)
|
|
&& fp->_Rback == fp->_Back + sizeof (fp->_Back)
|
|
&& fp->_Rsave == NULL)
|
|
#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 || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
|
|
fp_->_flags &= ~__SOFF;
|
|
#endif
|
|
return -1;
|
|
}
|
|
else
|
|
{
|
|
#if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
|
|
fp_->_offset = pos;
|
|
fp_->_flags |= __SOFF;
|
|
fp_->_flags &= ~__SEOF;
|
|
#elif defined __EMX__ /* emx+gcc */
|
|
fp->_flags &= ~_IOEOF;
|
|
#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
|
|
fp->_flag &= ~_IOEOF;
|
|
#endif
|
|
return 0;
|
|
}
|
|
}
|
|
else
|
|
return fseeko (fp, offset, whence);
|
|
}
|