1 /* $OpenBSD: fwide.c,v 1.6 2019/12/03 05:03:37 asou 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
36 int
fwide(FILE * fp,int mode)37 fwide(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 FUNLOCKFILE(fp);
56 return 0; /* XXX */
57 }
58
59 if (wcio->wcio_mode == 0 && mode != 0)
60 wcio->wcio_mode = mode;
61 else
62 mode = wcio->wcio_mode;
63 FUNLOCKFILE(fp);
64
65 return mode;
66 }
67 DEF_STRONG(fwide);
68