1 /*
2 * Copyright (c) 1987, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 __FBSDID("$FreeBSD: src/sys/libkern/strcasecmp.c,v 1.2 2005/08/08 19:38:00 pjd Exp $");
36
37 #include <sys/param.h>
38 #include <sys/ctype.h>
39 #include <sys/libkern.h>
40
41 int
42 strcasecmp(const char *s1, const char *s2)
43 {
44 const u_char *us1 = (const u_char *)s1, *us2 = (const u_char *)s2;
45
46 while (tolower(*us1) == tolower(*us2)) {
47 if (*us1++ == '\0')
48 return (0);
49 us2++;
50 }
51 return (tolower(*us1) - tolower(*us2));
52 }
53
54 int
55 strncasecmp(const char *s1, const char *s2, size_t n)
56 {
57
58 if (n != 0) {
59 const u_char *us1 = (const u_char *)s1;
60 const u_char *us2 = (const u_char *)s2;
61
62 do {
63 if (tolower(*us1) != tolower(*us2))
64 return (tolower(*us1) - tolower(*us2));
65 if (*us1++ == '\0')
66 break;
67 us2++;
68 } while (--n != 0);
69 }
70 return (0);
71 }
72
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