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) 2003, 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
38/*
39 * This array is designed for mapping upper and lower case letter
40 * together for a case independent comparison.  The mappings are
41 * based upon ascii character sequences.
42 */
43
44extern const char strcase_charmap[];
45
46int
47ascii_strcasecmp(const char *s1, const char *s2)
48{
49	const unsigned char	*cm = (const unsigned char *)strcase_charmap;
50	const unsigned char	*us1 = (const unsigned char *)s1;
51	const unsigned char	*us2 = (const unsigned char *)s2;
52
53	while (cm[*us1] == cm[*us2++])
54		if (*us1++ == '\0')
55			return (0);
56	return (cm[*us1] - cm[*(us2 - 1)]);
57}
58