1 | /* $NetBSD: strncasecmp.c,v 1.2 2007/06/04 18:19:27 christos Exp $ */ |
2 | |
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. Neither the name of the University nor the names of its contributors |
16 | * may be used to endorse or promote products derived from this software |
17 | * without specific prior written permission. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
29 | * SUCH DAMAGE. |
30 | */ |
31 | |
32 | #include <sys/cdefs.h> |
33 | #if defined(LIBC_SCCS) && !defined(lint) |
34 | #if 0 |
35 | static char sccsid[] = "@(#)strcasecmp.c 8.1 (Berkeley) 6/4/93" ; |
36 | #else |
37 | __RCSID("$NetBSD: strncasecmp.c,v 1.2 2007/06/04 18:19:27 christos Exp $" ); |
38 | #endif |
39 | #endif /* LIBC_SCCS and not lint */ |
40 | |
41 | #if !defined(_KERNEL) && !defined(_STANDALONE) |
42 | #include "namespace.h" |
43 | #include <assert.h> |
44 | #include <ctype.h> |
45 | #include <string.h> |
46 | #ifdef __weak_alias |
47 | __weak_alias(strcasecmp,_strcasecmp) |
48 | __weak_alias(strncasecmp,_strncasecmp) |
49 | #endif |
50 | #else |
51 | #include <lib/libkern/libkern.h> |
52 | #include <machine/limits.h> |
53 | #endif |
54 | |
55 | int |
56 | strncasecmp(const char *s1, const char *s2, size_t n) |
57 | { |
58 | |
59 | _DIAGASSERT(s1 != NULL); |
60 | _DIAGASSERT(s2 != NULL); |
61 | |
62 | if (n != 0) { |
63 | const unsigned char *us1 = (const unsigned char *)s1, |
64 | *us2 = (const unsigned char *)s2; |
65 | |
66 | do { |
67 | if (tolower(*us1) != tolower(*us2++)) |
68 | return (tolower(*us1) - tolower(*--us2)); |
69 | if (*us1++ == '\0') |
70 | break; |
71 | } while (--n != 0); |
72 | } |
73 | return (0); |
74 | } |
75 | |