#include "libc.h"
#include <ctype.h>
#include <strings.h>

int strncasecmp(const char* _l, const char* _r, size_t n) {
    const unsigned char *l = (void *)_l, *r = (void *)_r;
    if (!n--)
        return 0;
    for (; *l && *r && n && (*l == *r || tolower(*l) == tolower(*r)); l++, r++, n--)
        ;
    return tolower(*l) - tolower(*r);
}