xref: /illumos-gate/usr/src/lib/libc/port/i18n/wsncmp.c (revision 1da57d551424de5a9d469760be7c4b4d4f10a755)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1986 AT&T	*/
28 /*	  All Rights Reserved  	*/
29 
30 /*
31  * Compare strings (at most n characters)
32  * 	returns:  s1>s2: >0  s1==s2: 0  s1<s2: <0
33  */
34 
35 #pragma weak _wcsncmp = wcsncmp
36 #pragma weak _wsncmp = wsncmp
37 
38 #include "lint.h"
39 #include <stdlib.h>
40 #include <wchar.h>
41 
42 int
wcsncmp(const wchar_t * s1,const wchar_t * s2,size_t n)43 wcsncmp(const wchar_t *s1, const wchar_t *s2, size_t n)
44 {
45 	if (s1 == s2)
46 		return (0);
47 
48 	n++;
49 	while (--n > 0 && *s1 == *s2++)
50 		if (*s1++ == 0)
51 			return (0);
52 	return ((n == 0) ? 0 : (*s1 - *(s2 - 1)));
53 }
54 
55 int
wsncmp(const wchar_t * s1,const wchar_t * s2,size_t n)56 wsncmp(const wchar_t *s1, const wchar_t *s2, size_t n)
57 {
58 	return (wcsncmp(s1, s2, n));
59 }
60