1: /* Copyright (C) 1993, 1997, 1998, 1999, 2001, 2002, 2003
    2:    Free Software Foundation, Inc.
    3:    This file is part of the GNU C Library.
    4: 
    5:    The GNU C Library is free software; you can redistribute it and/or
    6:    modify it under the terms of the GNU Lesser General Public
    7:    License as published by the Free Software Foundation; either
    8:    version 2.1 of the License, or (at your option) any later version.
    9: 
   10:    The GNU C Library is distributed in the hope that it will be useful,
   11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:    Lesser General Public License for more details.
   14: 
   15:    You should have received a copy of the GNU Lesser General Public
   16:    License along with the GNU C Library; if not, write to the Free
   17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   18:    02111-1307 USA.
   19: 
   20:    As a special exception, if you link the code in this file with
   21:    files compiled with a GNU compiler to produce an executable,
   22:    that does not cause the resulting executable to be covered by
   23:    the GNU Lesser General Public License.  This exception does not
   24:    however invalidate any other reasons why the executable file
   25:    might be covered by the GNU Lesser General Public License.
   26:    This exception applies to code released by its copyright holders
   27:    in files containing the exception.  */
   28: 
   29: #include <stdlib.h>
   30: #include <libioP.h>
   31: #include <errno.h>
   32: #ifndef errno
   33: extern int errno;
   34: #endif
   35: #ifndef __set_errno
   36: # define __set_errno(Val) errno = (Val)
   37: #endif
   38: 
   39: _IO_off64_t
   40: _IO_seekoff_unlocked (fp, offset, dir, mode)
   41:      _IO_FILE *fp;
   42:      _IO_off64_t offset;
   43:      int dir;
   44:      int mode;
   45: {
   46:   if (dir != _IO_seek_cur && dir != _IO_seek_set && dir != _IO_seek_end)
   47:     {
   48:       __set_errno (EINVAL);
   49:       return EOF;
   50:     }
   51: 
   52:   /* If we have a backup buffer, get rid of it, since the __seekoff
   53:      callback may not know to do the right thing about it.
   54:      This may be over-kill, but it'll do for now. TODO */
   55:   if (mode != 0 && ((_IO_fwide (fp, 0) < 0 && _IO_have_backup (fp))
   56:                     || (_IO_fwide (fp, 0) > 0 && _IO_have_wbackup (fp))))
   57:     {
   58:       if (dir == _IO_seek_cur && _IO_in_backup (fp))
   59:         {
   60:           if (_IO_vtable_offset (fp) != 0 || fp->_mode <= 0)
   61:             offset -= fp->_IO_read_end - fp->_IO_read_ptr;
   62:           else
   63:             abort ();
   64:         }
   65:       if (_IO_fwide (fp, 0) < 0)
   66:         INTUSE(_IO_free_backup_area) (fp);
   67:       else
   68:         INTUSE(_IO_free_wbackup_area) (fp);
   69:     }
   70: 
   71:   return _IO_SEEKOFF (fp, offset, dir, mode);
   72: }
   73: 
   74: 
   75: _IO_off64_t
   76: _IO_seekoff (fp, offset, dir, mode)
   77:      _IO_FILE *fp;
   78:      _IO_off64_t offset;
   79:      int dir;
   80:      int mode;
   81: {
   82:   _IO_off64_t retval;
   83: 
   84:   _IO_acquire_lock (fp);
   85:   retval = _IO_seekoff_unlocked (fp, offset, dir, mode);
   86:   _IO_release_lock (fp);
   87:   return retval;
   88: }