slightly cleaner strlen, also seems to compile to better code

[musl] / src / string / strncasecmp.c

#include <strings.h>
#include <ctype.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);
}