1/* $NetBSD: fwide.c,v 1.2 2003/01/18 11:29:54 thorpej Exp $ */
2
3/*-
4 * Copyright (c)2001 Citrus Project,
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $Citrus$
29 */
30
31#include <sys/cdefs.h>
32#if defined(LIBC_SCCS) && !defined(lint)
33__RCSID("$NetBSD$");
34#endif /* LIBC_SCCS and not lint */
35
36#include <assert.h>
37#include <stdio.h>
38#include <wchar.h>
39#include "reentrant.h"
40#include "local.h"
41
42int
43fwide(FILE *fp, int mode)
44{
45	struct wchar_io_data *wcio;
46
47	_DIAGASSERT(fp != NULL);
48
49	/*
50	 * this implementation use only -1, 0, 1
51	 * for mode value.
52	 * (we don't need to do this, but
53	 *  this can make things simpler.)
54	 */
55	if (mode > 0)
56		mode = 1;
57	else if (mode < 0)
58		mode = -1;
59
60	FLOCKFILE(fp);
61	wcio = WCIO_GET(fp);
62	if (!wcio)
63		return 0; /* XXX */
64
65	if (wcio->wcio_mode == 0 && mode != 0)
66		wcio->wcio_mode = mode;
67	else
68		mode = wcio->wcio_mode;
69	FUNLOCKFILE(fp);
70
71	return mode;
72}
73