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/*
Copyright (c) 2016 Corinna Vinschen <corinna@vinschen.de>
*/
/*
FUNCTION
<<strncasecmp_l>>---case-insensitive character string compare
INDEX
strncasecmp_l
SYNOPSIS
#include <strings.h>
int strncasecmp_l(const char *<[a]>, const char * <[b]>,
size_t <[length]>, locale_t <[locale]>);
DESCRIPTION
<<strncasecmp_l>> compares up to <[length]> characters
from the string at <[a]> to the string at <[b]> in a
case-insensitive manner.
if <[locale]> is LC_GLOBAL_LOCALE or not a valid locale object, the
behaviour is undefined.
RETURNS
If <<*<[a]>>> sorts lexicographically after <<*<[b]>>> (after
both are converted to lowercase), <<strncasecmp_l>> returns a
number greater than zero. If the two strings are equivalent,
<<strncasecmp_l>> returns zero. If <<*<[a]>>> sorts
lexicographically before <<*<[b]>>>, <<strncasecmp_l>> returns a
number less than zero.
PORTABILITY
<<strncasecmp_l>> is POSIX-1.2008.
<<strncasecmp_l>> requires no supporting OS subroutines. It uses
tolower_l() from elsewhere in this library.
QUICKREF
strncasecmp_l
*/
#define _DEFAULT_SOURCE
#include <strings.h>
#include <ctype.h>
int
strncasecmp_l(const char *s1, const char *s2, size_t n, locale_t locale)
{
int d = 0;
for (; n != 0; n--) {
const int c1 = tolower_l(*(unsigned char *)s1++, locale);
const int c2 = tolower_l(*(unsigned char *)s2++, locale);
if (((d = c1 - c2) != 0) || (c2 == '\0'))
break;
}
return d;
}