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) 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
27 /* All Rights Reserved */
28
29 /*
30 * Portions of this source code were derived from Berkeley 4.3 BSD
31 * under license from the Regents of the University of California.
32 */
33
34 #include "lint.h"
35 #include <sys/types.h>
36 #include <strings.h>
37 #include <ctype.h>
38
39 int
strcasecmp(const char * s1,const char * s2)40 strcasecmp(const char *s1, const char *s2)
41 {
42 extern int charset_is_ascii;
43 extern int ascii_strcasecmp(const char *s1, const char *s2);
44 int *cm;
45 const uchar_t *us1;
46 const uchar_t *us2;
47
48 /*
49 * If we are in a locale that uses the ASCII character set
50 * (C or POSIX), use the fast ascii_strcasecmp() function.
51 */
52 if (charset_is_ascii)
53 return (ascii_strcasecmp(s1, s2));
54
55 cm = __trans_lower;
56 us1 = (const uchar_t *)s1;
57 us2 = (const uchar_t *)s2;
58
59 while (cm[*us1] == cm[*us2++])
60 if (*us1++ == '\0')
61 return (0);
62 return (cm[*us1] - cm[*(us2 - 1)]);
63 }
64