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
35static 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
55int
56strncasecmp(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