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/* Copyright (c) 2009 Corinna Vinschen <corinna@vinschen.de> */
/*
FUNCTION
<<wcscasecmp>>---case-insensitive wide character string compare
INDEX
wcscasecmp
SYNOPSIS
#include <wchar.h>
int wcscasecmp(const wchar_t *<[a]>, const wchar_t *<[b]>);
DESCRIPTION
<<wcscasecmp>> compares the wide character string at <[a]> to
the wide character string at <[b]> in a case-insensitive manner.
RETURNS
If <<*<[a]>>> sorts lexicographically after <<*<[b]>>> (after
both are converted to uppercase), <<wcscasecmp>> returns a
number greater than zero. If the two strings match,
<<wcscasecmp>> returns zero. If <<*<[a]>>> sorts
lexicographically before <<*<[b]>>>, <<wcscasecmp>> returns a
number less than zero.
PORTABILITY
POSIX-1.2008
<<wcscasecmp>> requires no supporting OS subroutines. It uses
tolower() from elsewhere in this library.
QUICKREF
wcscasecmp
*/
#define _DEFAULT_SOURCE
#include <wchar.h>
#include <wctype.h>
int
wcscasecmp(const wchar_t *s1, const wchar_t *s2)
{
int d = 0;
for (;;) {
const int c1 = towlower(*s1++);
const int c2 = towlower(*s2++);
if (((d = c1 - c2) != 0) || (c2 == '\0'))
break;
}
return d;
}