1 /* Copyright (c) 2009 Corinna Vinschen <corinna@vinschen.de> */
2 /*
3 FUNCTION
4 <<wcscasecmp>>---case-insensitive wide character string compare
5
6 INDEX
7 wcscasecmp
8
9 SYNOPSIS
10 #include <wchar.h>
11 int wcscasecmp(const wchar_t *<[a]>, const wchar_t *<[b]>);
12
13 DESCRIPTION
14 <<wcscasecmp>> compares the wide character string at <[a]> to
15 the wide character string at <[b]> in a case-insensitive manner.
16
17 RETURNS
18
19 If <<*<[a]>>> sorts lexicographically after <<*<[b]>>> (after
20 both are converted to uppercase), <<wcscasecmp>> returns a
21 number greater than zero. If the two strings match,
22 <<wcscasecmp>> returns zero. If <<*<[a]>>> sorts
23 lexicographically before <<*<[b]>>>, <<wcscasecmp>> returns a
24 number less than zero.
25
26 PORTABILITY
27 POSIX-1.2008
28
29 <<wcscasecmp>> requires no supporting OS subroutines. It uses
30 tolower() from elsewhere in this library.
31
32 QUICKREF
33 wcscasecmp
34 */
35
36 #define _DEFAULT_SOURCE
37 #include <wchar.h>
38 #include <wctype.h>
39
40 int
wcscasecmp(const wchar_t * s1,const wchar_t * s2)41 wcscasecmp (const wchar_t *s1,
42 const wchar_t *s2)
43 {
44 int d = 0;
45 for ( ; ; )
46 {
47 const int c1 = towlower (*s1++);
48 const int c2 = towlower (*s2++);
49 if (((d = c1 - c2) != 0) || (c2 == '\0'))
50 break;
51 }
52 return d;
53 }
54
