xref: /titanic_51/usr/src/lib/libc/port/locale/wcscasecmp.c (revision 2d08521bd15501c8370ba2153b9cca4f094979d0)
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 (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
24  * Copyright 2013 Garrett D'Amore <garrett@damore.org>
25  */
26 
27 /*
28  * Compare strings ignoring case difference.
29  *	returns:  s1>s2: >0  s1==s2: 0  s1<s2: <0
30  * All letters are converted to the lowercase and compared.
31  */
32 
33 #include "lint.h"
34 #include <stdlib.h>
35 #include <wchar.h>
36 #include <locale.h>
37 #include "libc.h"
38 
39 /* Legacy Sun interfaces */
40 #pragma weak wscasecmp = wcscasecmp
41 #pragma weak wsncasecmp = wcsncasecmp
42 
43 int
44 wcscasecmp_l(const wchar_t *s1, const wchar_t *s2, locale_t loc)
45 {
46 	if (s1 == s2)
47 		return (0);
48 
49 	while (towlower_l(*s1, loc) == towlower_l(*s2, loc)) {
50 		if (*s1 == 0)
51 			return (0);
52 		s1++;
53 		s2++;
54 	}
55 	return (towlower_l(*s1, loc) - towlower_l(*s2, loc));
56 }
57 
58 int
59 wcscasecmp(const wchar_t *s1, const wchar_t *s2)
60 {
61 	return (wcscasecmp_l(s1, s2, uselocale(NULL)));
62 }
63 
64 int
65 wcsncasecmp_l(const wchar_t *s1, const wchar_t *s2, size_t n, locale_t loc)
66 {
67 	if (s1 == s2)
68 		return (0);
69 
70 	while ((towlower_l(*s1, loc) == towlower_l(*s2, loc)) && n--) {
71 		if (*s1 == 0)
72 			return (0);
73 		s1++;
74 		s2++;
75 	}
76 	return (towlower_l(*s1, loc) - towlower_l(*s2, loc));
77 }
78 
79 int
80 wcsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n)
81 {
82 	return (wcsncasecmp_l(s1, s2, n, uselocale(NULL)));
83 }
84