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) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32/*
33 *  NAME
34 *	casncmp - compare strings ignoring case
35 *
36 *  SYNOPSIS
37 *	int casncmp(char *s1, char *s2, ssize_t n)
38 *
39 *  DESCRIPTION
40 *	Compare two strings ignoring case differences.
41 *	Stop after n bytes or the trailing NUL.
42 */
43
44#include "libmail.h"
45#include <ctype.h>
46#include <sys/types.h>
47
48int
49casncmp(char *s1, char *s2, ssize_t n)
50{
51	if (s1 == s2)
52		return (0);
53	while ((--n >= 0) && (tolower(*s1) == tolower(*s2))) {
54		s2++;
55		if (*s1++ == '\0')
56			return (0);
57	}
58	return ((n < 0)? 0: (*s1 - *s2));
59}
60