1 /*
2 FUNCTION
3 <<wcscmp>>---compare two wide-character strings
4
5 SYNOPSIS
6 #include <wchar.h>
7 int wcscmp(const wchar_t *<[s1]>, *<[s2]>);
8
9 DESCRIPTION
10 The <<wcscmp>> function compares the wide-character string pointed to
11 by <[s1]> to the wide-character string pointed to by <[s2]>.
12
13 The sign of a non-zero return value is determined by the sign of the
14 difference between the values of the first pair of wide-character codes
15 that differ in the objects being compared.
16
17 RETURNS
18 Upon completion, <<wcscmp>> returns an integer greater than, equal to
19 or less than 0, if the wide-character string pointed to by <[s1]> is
20 greater than, equal to or less than the wide-character string pointed
21 to by <[s2]> respectively.
22
23 PORTABILITY
24 <<wcscmp>> is ISO/IEC 9899/AMD1:1995 (ISO C).
25
26 No supporting OS subroutines are required.
27 */
28
29 /* $NetBSD$ */
30
31 /*-
32 * Copyright (c) 1990, 1993
33 * The Regents of the University of California. All rights reserved.
34 *
35 * This code is derived from software contributed to Berkeley by
36 * Chris Torek.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 */
62
63 #include <_ansi.h>
64 #include <wchar.h>
65
66 /*
67 * Compare strings.
68 */
69 int
wcscmp(const wchar_t * s1,const wchar_t * s2)70 wcscmp (const wchar_t * s1,
71 const wchar_t * s2)
72 {
73
74 while (*s1 == *s2++)
75 if (*s1++ == 0)
76 return (0);
77 return (*s1 - *--s2);
78 }
79