Home | History | Annotate | Line # | Download | only in string
wmemcmp.c revision 1.6 
      1 /*	$NetBSD: wmemcmp.c,v 1.6 2009/01/11 02:46:30 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c)1999 Citrus Project,
      5  * 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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  *
     28  *	citrus Id: wmemcmp.c,v 1.2 2000/12/20 14:08:31 itojun Exp
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 #if defined(LIBC_SCCS) && !defined(lint)
     33 __RCSID("$NetBSD: wmemcmp.c,v 1.6 2009/01/11 02:46:30 christos Exp $");
     34 #endif /* LIBC_SCCS and not lint */
     35 
     36 #include <assert.h>
     37 #include <wchar.h>
     38 #include "runetype_local.h"
     39 
     40 int
     41 wmemcmp(s1, s2, n)
     42 	const wchar_t *s1;
     43 	const wchar_t *s2;
     44 	size_t n;
     45 {
     46 	size_t i;
     47 
     48 	_DIAGASSERT(s1 != NULL);
     49 	_DIAGASSERT(s2 != NULL);
     50 
     51 	for (i = 0; i < n; i++) {
     52 		if (*s1 != *s2) {
     53 			/* wchar might be unsigned */
     54 			return *(const __nbrune_t *)s1 >
     55 			       *(const __nbrune_t *)s2 ? 1 : -1;
     56 		}
     57 		s1++;
     58 		s2++;
     59 	}
     60 	return 0;
     61 }
     62