StdLib/LibC/Stdio/fwide.c

   1 /*
   2     Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
   3     This program and the accompanying materials are licensed and made available
   4     under the terms and conditions of the BSD License that accompanies this
   5     distribution.  The full text of the license may be found at
   6     http://opensource.org/licenses/bsd-license.
   7
   8     THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   9     WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  10
  11  * Copyright (c)2001 Citrus Project,
  12  * All rights reserved.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  * $Citrus$
  36
  37     NetBSD: fwide.c,v 1.3 2005/06/12 05:21:27 lukem Exp
  38 */
  39 #include  <LibConfig.h>
  40 #include <sys/EfiCdefs.h>
  41
  42 #include <assert.h>
  43 #include  <errno.h>
  44 #include <stdio.h>
  45 #include <wchar.h>
  46 #include "reentrant.h"
  47 #include "local.h"
  48
  49 int
  50 fwide(FILE *fp, int mode)
  51 {
  52   struct wchar_io_data *wcio;
  53
  54   _DIAGASSERT(fp != NULL);
  55   if(fp == NULL) {
  56     errno = EINVAL;
  57     return (0);
  58   }
  59
  60   /*
  61    * this implementation use only -1, 0, 1
  62    * for mode value.
  63    * (we don't need to do this, but
  64    *  this can make things simpler.)
  65    */
  66   if (mode > 0)
  67     mode = 1;
  68   else if (mode < 0)
  69     mode = -1;
  70
  71   FLOCKFILE(fp);
  72   wcio = WCIO_GET(fp);
  73   if (!wcio)
  74     return 0; /* XXX */
  75
  76   if (wcio->wcio_mode == 0 && mode != 0)
  77     wcio->wcio_mode = mode;
  78   else
  79     mode = wcio->wcio_mode;
  80   FUNLOCKFILE(fp);
  81
  82   return mode;
  83 }