1 /* $NetBSD: fwide.c,v 1.3 2005/06/12 05:21:27 lukem 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: fwide.c,v 1.3 2005/06/12 05:21:27 lukem Exp $");
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
42 int
fwide(FILE * fp,int mode)43 fwide(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