1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1987, 1993
5 *	The Regents of the University of California.  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 * 3. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#include <ctype.h>
38#include <strings.h>
39
40
41int
42strcasecmp(const char *s1, const char *s2)
43{
44	const u_char *us1 = (const u_char *)s1;
45	const u_char *us2 = (const u_char *)s2;
46
47	while (tolower(*us1) == tolower(*us2++)) {
48		if (*us1++ == '\0')
49			return 0;
50	}
51
52	return tolower(*us1) - tolower(*--us2);
53}
54
55
56int
57strncasecmp(const char *s1, const char *s2, size_t n)
58{
59	if (n != 0) {
60		const u_char *us1 = (const u_char *)s1;
61		const u_char *us2 = (const u_char *)s2;
62
63		do {
64			if (tolower(*us1) != tolower(*us2++))
65				return tolower(*us1) - tolower(*--us2);
66			if (*us1++ == '\0')
67				break;
68		} while (--n != 0);
69	}
70	return 0;
71}
72
73
74int
75strcasecmp_l(const char *s1, const char *s2, locale_t locale)
76{
77	const u_char
78			*us1 = (const u_char *)s1,
79			*us2 = (const u_char *)s2;
80
81	while (tolower_l(*us1, locale) == tolower_l(*us2++, locale))
82		if (*us1++ == '\0')
83			return (0);
84	return (tolower_l(*us1, locale) - tolower_l(*--us2, locale));
85}
86
87
88int
89strncasecmp_l(const char *s1, const char *s2, size_t n, locale_t locale)
90{
91	if (n != 0) {
92		const u_char
93				*us1 = (const u_char *)s1,
94				*us2 = (const u_char *)s2;
95
96		do {
97			if (tolower_l(*us1, locale) != tolower_l(*us2++, locale))
98				return (tolower_l(*us1, locale) - tolower_l(*--us2, locale));
99			if (*us1++ == '\0')
100				break;
101		} while (--n != 0);
102	}
103	return (0);
104}
105