mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-05 21:00:05 +00:00
40a982a9e1
2001-08-09 Ulrich Drepper <drepper@redhat.com> * libio/wfileops.c (_IO_wfile_seekoff): Don't even try to handle seeking with backup buffer present. Correct determining of internal buffer position. Reset also wide buffers if we reset the internal buffers. * libio/iofwide.c (_IO_fwide): Always determine file offset for wide streams. * libio/ioseekoff.c: Catch one unimplemented case. * libio/ftello.c: Don't abort if the wide stream has backup buffer. * libio/ftello64.c: Likewise. * libio/iofgetpos.c: Likewise. * libio/iofgetpos64.c: Likewise. * libio/ftell.c: Likewise. * libio/Makefile (tests): Add tst-ungetwc2. * libio/tst-ungetwc2.c: New file.
77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
/* Copyright (C) 1993, 1997, 1998, 1999, 2001 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA.
|
|
|
|
As a special exception, if you link the code in this file with
|
|
files compiled with a GNU compiler to produce an executable,
|
|
that does not cause the resulting executable to be covered by
|
|
the GNU Lesser General Public License. This exception does not
|
|
however invalidate any other reasons why the executable file
|
|
might be covered by the GNU Lesser General Public License.
|
|
This exception applies to code released by its copyright holders
|
|
in files containing the exception. */
|
|
|
|
#include <stdlib.h>
|
|
#include <libioP.h>
|
|
#include <errno.h>
|
|
#ifndef errno
|
|
extern int errno;
|
|
#endif
|
|
#ifndef __set_errno
|
|
# define __set_errno(Val) errno = (Val)
|
|
#endif
|
|
|
|
_IO_off64_t
|
|
_IO_seekoff (fp, offset, dir, mode)
|
|
_IO_FILE *fp;
|
|
_IO_off64_t offset;
|
|
int dir;
|
|
int mode;
|
|
{
|
|
_IO_off64_t retval;
|
|
|
|
if (dir != _IO_seek_cur && dir != _IO_seek_set && dir != _IO_seek_end)
|
|
{
|
|
__set_errno (EINVAL);
|
|
return EOF;
|
|
}
|
|
|
|
/* If we have a backup buffer, get rid of it, since the __seekoff
|
|
callback may not know to do the right thing about it.
|
|
This may be over-kill, but it'll do for now. TODO */
|
|
_IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp);
|
|
_IO_flockfile (fp);
|
|
|
|
if (mode != 0 && _IO_have_backup (fp))
|
|
{
|
|
if (dir == _IO_seek_cur && _IO_in_backup (fp))
|
|
{
|
|
if (fp->_vtable_offset != 0 || fp->_mode <= 0)
|
|
offset -= fp->_IO_read_end - fp->_IO_read_ptr;
|
|
else
|
|
abort ();
|
|
}
|
|
_IO_free_backup_area (fp);
|
|
}
|
|
|
|
retval = _IO_SEEKOFF (fp, offset, dir, mode);
|
|
|
|
_IO_funlockfile (fp);
|
|
_IO_cleanup_region_end (0);
|
|
return retval;
|
|
}
|