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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: head/sys/libkern/strcasecmp.c 148865 2005-08-08 19:38:00Z pjd $
30 */
31
32 #include <sys/param.h>
33 #include <sys/ctype.h>
34 #include <sys/libkern.h>
35
36 int
strcasecmp(const char * s1,const char * s2)37 strcasecmp(const char *s1, const char *s2)
38 {
39 const u_char *us1 = (const u_char *)s1, *us2 = (const u_char *)s2;
40
41 while (tolower(*us1) == tolower(*us2)) {
42 if (*us1++ == '\0')
43 return (0);
44 us2++;
45 }
46 return (tolower(*us1) - tolower(*us2));
47 }
48
49 int
strncasecmp(const char * s1,const char * s2,size_t n)50 strncasecmp(const char *s1, const char *s2, size_t n)
51 {
52
53 if (n != 0) {
54 const u_char *us1 = (const u_char *)s1;
55 const u_char *us2 = (const u_char *)s2;
56
57 do {
58 if (tolower(*us1) != tolower(*us2))
59 return (tolower(*us1) - tolower(*us2));
60 if (*us1++ == '\0')
61 break;
62 us2++;
63 } while (--n != 0);
64 }
65 return (0);
66 }
67