xref: /illumos-gate/usr/src/lib/libc/port/locale/wcwidth.c (revision 2d08521b)
1 /*
2  * Copyright 2013 Garrett D'Amore <garrett@damore.org>
3  * Copyright (c) 1989, 1993
4  *	The Regents of the University of California.  All rights reserved.
5  * (c) UNIX System Laboratories, Inc.
6  * All or some portions of this file are derived from material licensed
7  * to the University of California by American Telephone and Telegraph
8  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
9  * the permission of UNIX System Laboratories, Inc.
10  *
11  * This code is derived from software contributed to Berkeley by
12  * Paul Borman at Krystal Technologies.
13  *
14  * Redistribution and use in source and binary forms, with or without
15  * modification, are permitted provided that the following conditions
16  * are met:
17  * 1. Redistributions of source code must retain the above copyright
18  *    notice, this list of conditions and the following disclaimer.
19  * 2. Redistributions in binary form must reproduce the above copyright
20  *    notice, this list of conditions and the following disclaimer in the
21  *    documentation and/or other materials provided with the distribution.
22  * 4. Neither the name of the University nor the names of its contributors
23  *    may be used to endorse or promote products derived from this software
24  *    without specific prior written permission.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36  * SUCH DAMAGE.
37  */
38 
39 /*
40  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
41  * Use is subject to license terms.
42  */
43 
44 #include "lint.h"
45 #include <wchar.h>
46 #include "_ctype.h"
47 #include "runetype.h"
48 #include "localeimpl.h"
49 
50 #undef wcwidth
51 
52 int
wcwidth_l(wchar_t wc,locale_t loc)53 wcwidth_l(wchar_t wc, locale_t loc)
54 {
55 	unsigned int x;
56 	const _RuneLocale *rl = loc->runelocale;
57 
58 	if (wc == 0)
59 		return (0);
60 
61 	x = ((wc < 0 || wc >= _CACHED_RUNES) ? __runetype(rl, wc) :
62 	    rl->__runetype[wc]) & (_CTYPE_SWM|_CTYPE_R);
63 
64 	if ((x & _CTYPE_SWM) != 0)
65 		return ((x & _CTYPE_SWM) >> _CTYPE_SWS);
66 	return ((x & _CTYPE_R) != 0 ? 1 : -1);
67 }
68 
69 int
wcwidth(wchar_t wc)70 wcwidth(wchar_t wc)
71 {
72 	return (wcwidth_l(wc, uselocale(NULL)));
73 }
74 
75 #pragma weak _scrwidth = scrwidth
76 
77 /*
78  * This is a Solaris extension.  It never returns a negative width, even for
79  * non-printable characters.  It is used internally by the printf
80  * implementation for %ws.
81  */
82 int
scrwidth(wchar_t wc)83 scrwidth(wchar_t wc)
84 {
85 	int	v = wcwidth(wc);
86 	return (v > 0 ? v : 0);
87 }
88