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glibc  2.9
fwide.c
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00001 /* Copyright (C) 1999, 2000, 2003 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 #include <stdio.h>
00030 #include <wchar.h>
00031 
00032 int
00033 fwide (fp, mode)
00034      _IO_FILE *fp;
00035      int mode;
00036 {
00037   int result;
00038 
00039   /* Normalize the value.  */
00040   mode = mode < 0 ? -1 : (mode == 0 ? 0 : 1);
00041 
00042   if (mode == 0 || fp->_mode != 0)
00043     /* The caller simply wants to know about the current orientation
00044        or the orientation already has been determined.  */
00045     return fp->_mode;
00046 
00047   _IO_acquire_lock (fp);
00048   result = _IO_fwide (fp, mode);
00049   _IO_release_lock (fp);
00050 
00051   return result;
00052 }