1 /* $Id: strcasecmp.c,v 1.2 2005/07/07 16:34:06 dron Exp $ */

     2 

     3 /*

     4  * Copyright (c) 1987, 1993

     5  *	The Regents of the University of California.  All rights reserved.

     6  *

     7  * Redistribution and use in source and binary forms, with or without

     8  * modification, are permitted provided that the following conditions

     9  * are met:

    10  * 1. Redistributions of source code must retain the above copyright

    11  *    notice, this list of conditions and the following disclaimer.

    12  * 2. Redistributions in binary form must reproduce the above copyright

    13  *    notice, this list of conditions and the following disclaimer in the

    14  *    documentation and/or other materials provided with the distribution.

    15  * 3. Neither the name of the University nor the names of its contributors

    16  *    may be used to endorse or promote products derived from this software

    17  *    without specific prior written permission.

    18  *

    19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

    20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

    23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

    24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

    25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

    26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

    27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

    28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

    29  * SUCH DAMAGE.

    30  */

    31 

    32 #if 0

    33 static char sccsid[] = "@(#)strcasecmp.c	8.1 (Berkeley) 6/4/93";

    34 __RCSID("$NetBSD: strcasecmp.c,v 1.16 2003/08/07 16:43:49 agc Exp $");

    35 #endif

    36 

    37 #include <ctype.h>

    38 #include <string.h>

    39 

    40 int

    41 strcasecmp(const char *s1, const char *s2)

    42 {

    43 	const unsigned char *us1 = (const unsigned char *)s1,

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

    45 

    46 	while (tolower(*us1) == tolower(*us2++))

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

    48 			return (0);

    49 	return (tolower(*us1) - tolower(*--us2));

    50 }