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glibc  2.9
ioseekpos.c
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00001 /* Copyright (C) 1993,1997-1999,2002,2003,2004 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.
00018 
00019    As a special exception, if you link the code in this file with
00020    files compiled with a GNU compiler to produce an executable,
00021    that does not cause the resulting executable to be covered by
00022    the GNU Lesser General Public License.  This exception does not
00023    however invalidate any other reasons why the executable file
00024    might be covered by the GNU Lesser General Public License.
00025    This exception applies to code released by its copyright holders
00026    in files containing the exception.  */
00027 
00028 #include <libioP.h>
00029 
00030 _IO_off64_t
00031 _IO_seekpos_unlocked (fp, pos, mode)
00032      _IO_FILE *fp;
00033      _IO_off64_t pos;
00034      int mode;
00035 {
00036   /* If we have a backup buffer, get rid of it, since the __seekoff
00037      callback may not know to do the right thing about it.
00038      This may be over-kill, but it'll do for now. TODO */
00039   if (_IO_fwide (fp, 0) <= 0)
00040     {
00041       if (_IO_have_backup (fp))
00042        INTUSE(_IO_free_backup_area) (fp);
00043     }
00044   else
00045     {
00046       if (_IO_have_wbackup (fp))
00047        INTUSE(_IO_free_wbackup_area) (fp);
00048     }
00049 
00050   return _IO_SEEKOFF (fp, pos, 0, mode);
00051 }
00052 
00053 
00054 _IO_off64_t
00055 _IO_seekpos (fp, pos, mode)
00056      _IO_FILE *fp;
00057      _IO_off64_t pos;
00058      int mode;
00059 {
00060   _IO_off64_t retval;
00061 
00062   _IO_acquire_lock (fp);
00063   retval = _IO_seekpos_unlocked (fp, pos, mode);
00064   _IO_release_lock (fp);
00065   return retval;
00066 }