nativelibc/string/strncasecmp.c

/*	A part of the Native C Library for Windows NT
	Copyright 2007-2015 PC GO Ld.

	This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
*/

#include <string.h>
#include <ctype.h>

int strncasecmp(const char *s1, const char *s2, size_t n) {
	int r;
	const unsigned char *p1 = (const unsigned char *)s1;
	const unsigned char *p2 = (const unsigned char *)s2;
	if(p1 == p2 || !n) return 0;
	while((r = tolower(*p1) - tolower(*p2++)) == 0) {
		if(!*p1++ || !--n) return r;
	}
	return r;
}