1 /*
2 FUNCTION
3 <<wmemcmp>>---compare wide characters in memory
4
5 SYNOPSIS
6 #include <wchar.h>
7 int wmemcmp(const wchar_t *<[s1]>, const wchar_t *<[s2]>, size_t <[n]>);
8
9 DESCRIPTION
10 The <<wmemcmp>> function compares the first <[n]> wide characters of the
11 object pointed to by <[s1]> to the first <[n]> wide characters of the
12 object pointed to by <[s2]>. This function is not affected by locale
13 and all wchar_t values are treated identically. The null wide character
14 and wchar_t values not corresponding to valid characters are not treated
15 specially.
16
17 If <[n]> is zero, <[s1]> and <[s2]> must be a valid pointers and the
18 function behaves as if the two objects compare equal.
19
20 RETURNS
21 The <<wmemcmp>> function returns an integer greater than, equal to,
22 or less than zero, accordingly as the object pointed to by <[s1]> is
23 greater than, equal to, or less than the object pointed to by <[s2]>.
24
25 PORTABILITY
26 <<wmemcmp>> is ISO/IEC 9899/AMD1:1995 (ISO C).
27
28 No supporting OS subroutines are required.
29 */
30
31 /* $NetBSD: wmemcmp.c,v 1.1 2000/12/23 23:14:37 itojun Exp $ */
32
33 /*-
34 * Copyright (c)1999 Citrus Project,
35 * All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 *
46 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56 * SUCH DAMAGE.
57 *
58 * citrus Id: wmemcmp.c,v 1.2 2000/12/20 14:08:31 itojun Exp
59 */
60
61 #include <_ansi.h>
62 #include <wchar.h>
63
64 int
wmemcmp(const wchar_t * s1,const wchar_t * s2,size_t n)65 wmemcmp (const wchar_t * s1,
66 const wchar_t * s2,
67 size_t n)
68 {
69 size_t i;
70
71 for (i = 0; i < n; i++)
72 {
73 if (*s1 != *s2)
74 {
75 /* wchar might be unsigned */
76 return *s1 > *s2 ? 1 : -1;
77 }
78 s1++;
79 s2++;
80 }
81 return 0;
82 }
83
