xref: /freebsd/lib/libc/locale/nextwctype.c (revision 1d386b48)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2004 Tim J. Robbins.
5  * All rights reserved.
6  *
7  * Copyright (c) 2011 The FreeBSD Foundation
8  *
9  * Portions of this software were developed by David Chisnall
10  * under sponsorship from the FreeBSD Foundation.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 #include <sys/cdefs.h>
35 #include <runetype.h>
36 #include <wchar.h>
37 #include <wctype.h>
38 #include "mblocal.h"
39 
40 wint_t
41 nextwctype_l(wint_t wc, wctype_t wct, locale_t locale)
42 {
43 	size_t lim;
44 	FIX_LOCALE(locale);
45 	_RuneLocale *runes = XLOCALE_CTYPE(locale)->runes;
46 	_RuneRange *rr = &runes->__runetype_ext;
47 	_RuneEntry *base, *re;
48 	int noinc;
49 
50 	noinc = 0;
51 	if (wc < _CACHED_RUNES) {
52 		wc++;
53 		while (wc < _CACHED_RUNES) {
54 			if (runes->__runetype[wc] & wct)
55 				return (wc);
56 			wc++;
57 		}
58 		wc--;
59 	}
60 	if (rr->__ranges != NULL && wc < rr->__ranges[0].__min) {
61 		wc = rr->__ranges[0].__min;
62 		noinc = 1;
63 	}
64 
65 	/* Binary search -- see bsearch.c for explanation. */
66 	base = rr->__ranges;
67 	for (lim = rr->__nranges; lim != 0; lim >>= 1) {
68 		re = base + (lim >> 1);
69 		if (re->__min <= wc && wc <= re->__max)
70 			goto found;
71 		else if (wc > re->__max) {
72 			base = re + 1;
73 			lim--;
74 		}
75 	}
76 	return (-1);
77 found:
78 	if (!noinc)
79 		wc++;
80 	if (re->__min <= wc && wc <= re->__max) {
81 		if (re->__types != NULL) {
82 			for (; wc <= re->__max; wc++)
83 				if (re->__types[wc - re->__min] & wct)
84 					return (wc);
85 		} else if (re->__map & wct)
86 			return (wc);
87 	}
88 	while (++re < rr->__ranges + rr->__nranges) {
89 		wc = re->__min;
90 		if (re->__types != NULL) {
91 			for (; wc <= re->__max; wc++)
92 				if (re->__types[wc - re->__min] & wct)
93 					return (wc);
94 		} else if (re->__map & wct)
95 			return (wc);
96 	}
97 	return (-1);
98 }
99 wint_t
100 nextwctype(wint_t wc, wctype_t wct)
101 {
102 	return nextwctype_l(wc, wct, __get_locale());
103 }
104