1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Paul Borman at Krystal Technologies.
9 *
10 * Copyright (c) 2011 The FreeBSD Foundation
11 *
12 * Portions of this software were developed by David Chisnall
13 * under sponsorship from the FreeBSD Foundation.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 3. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 */
39
40 #include <ctype.h>
41 #include <stdio.h>
42 #include <runetype.h>
43 #include <wchar.h>
44 #include "mblocal.h"
45
46 __ct_rune_t
___tolower_l(__ct_rune_t c,locale_t l)47 ___tolower_l(__ct_rune_t c, locale_t l)
48 {
49 size_t lim;
50 FIX_LOCALE(l);
51 _RuneRange *rr = &XLOCALE_CTYPE(l)->runes->__maplower_ext;
52 _RuneEntry *base, *re;
53
54 if (c < 0 || c == EOF)
55 return(c);
56
57 /* Binary search -- see bsearch.c for explanation. */
58 base = rr->__ranges;
59 for (lim = rr->__nranges; lim != 0; lim >>= 1) {
60 re = base + (lim >> 1);
61 if (re->__min <= c && c <= re->__max)
62 return (re->__map + c - re->__min);
63 else if (c > re->__max) {
64 base = re + 1;
65 lim--;
66 }
67 }
68
69 return(c);
70 }
71 __ct_rune_t
___tolower(__ct_rune_t c)72 ___tolower(__ct_rune_t c)
73 {
74 return ___tolower_l(c, __get_locale());
75 }
76