1 /* $OpenBSD: btowc.c,v 1.2 2012/12/05 23:20:00 deraadt Exp $ */
2
3 /*-
4 * Copyright (c) 2002, 2003 Tim J. Robbins.
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
29 #include <stdio.h>
30 #include <string.h>
31 #include <wchar.h>
32
33 wint_t
btowc(int c)34 btowc(int c)
35 {
36 mbstate_t mbs;
37 char cc;
38 wchar_t wc;
39
40 if (c == EOF)
41 return (WEOF);
42 /*
43 * We expect mbrtowc() to return 0 or 1, hence the check for n > 1
44 * which detects error return values as well as "impossible" byte
45 * counts.
46 */
47 memset(&mbs, 0, sizeof(mbs));
48 cc = (char)c;
49 if (mbrtowc(&wc, &cc, 1, &mbs) > 1)
50 return (WEOF);
51 return (wc);
52 }
53