1/*	$OpenBSD: fwide.c,v 1.4 2009/11/09 00:18:27 kurt Exp $	*/
2/* $NetBSD: fwide.c,v 1.2 2003/01/18 11:29:54 thorpej Exp $ */
3
4/*-
5 * Copyright (c)2001 Citrus Project,
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $Citrus$
30 */
31
32#include <stdio.h>
33#include <wchar.h>
34#include "local.h"
35
36int
37fwide(FILE *fp, int mode)
38{
39	struct wchar_io_data *wcio;
40
41	/*
42	 * this implementation use only -1, 0, 1
43	 * for mode value.
44	 * (we don't need to do this, but
45	 *  this can make things simpler.)
46	 */
47	if (mode > 0)
48		mode = 1;
49	else if (mode < 0)
50		mode = -1;
51
52	FLOCKFILE(fp);
53	wcio = WCIO_GET(fp);
54	if (!wcio)
55		return 0; /* XXX */
56
57	if (wcio->wcio_mode == 0 && mode != 0)
58		wcio->wcio_mode = mode;
59	else
60		mode = wcio->wcio_mode;
61	FUNLOCKFILE(fp);
62
63	return mode;
64}
65