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
41 int
strcasecmp(const char * s1,const char * s2)42 strcasecmp(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
56 int
strncasecmp(const char * s1,const char * s2,size_t n)57 strncasecmp(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
74 int
strcasecmp_l(const char * s1,const char * s2,locale_t locale)75 strcasecmp_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
88 int
strncasecmp_l(const char * s1,const char * s2,size_t n,locale_t locale)89 strncasecmp_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