/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/

/*	  All Rights Reserved  	*/

/*

 * Portions of this source code were derived from Berkeley 4.3 BSD

 * under license from the Regents of the University of California.

 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include "lint.h"

#include <sys/types.h>

#include <strings.h>

/*

 * This array is designed for mapping upper and lower case letter

 * together for a case independent comparison.  The mappings are

 * based upon ascii character sequences.

 */

extern const char strcase_charmap[];

int

strncasecmp(const char *s1, const char *s2, size_t n)

{

	const unsigned char	*cm = (const unsigned char *)strcase_charmap;

	const unsigned char	*us1 = (const unsigned char *)s1;

	const unsigned char	*us2 = (const unsigned char *)s2;

	while (n != 0 && cm[*us1] == cm[*us2++]) {

		if (*us1++ == '\0')

			return (0);

		n--;

	}

	return (n == 0 ? 0 : cm[*us1] - cm[*(us2 - 1)]);

}