1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1987, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/param.h>
37 #include <sys/ctype.h>
38 #include <sys/libkern.h>
39
40 int
strcasecmp(const char * s1,const char * s2)41 strcasecmp(const char *s1, const char *s2)
42 {
43 const u_char *us1 = (const u_char *)s1, *us2 = (const u_char *)s2;
44
45 while (tolower(*us1) == tolower(*us2)) {
46 if (*us1++ == '\0')
47 return (0);
48 us2++;
49 }
50 return (tolower(*us1) - tolower(*us2));
51 }
52
53 int
strncasecmp(const char * s1,const char * s2,size_t n)54 strncasecmp(const char *s1, const char *s2, size_t n)
55 {
56
57 if (n != 0) {
58 const u_char *us1 = (const u_char *)s1;
59 const u_char *us2 = (const u_char *)s2;
60
61 do {
62 if (tolower(*us1) != tolower(*us2))
63 return (tolower(*us1) - tolower(*us2));
64 if (*us1++ == '\0')
65 break;
66 us2++;
67 } while (--n != 0);
68 }
69 return (0);
70 }
71