slightly cleaner strlen, also seems to compile to better code

[musl] / src / string / wcsnlen.c

#include <wchar.h>

size_t wcsnlen(const wchar_t *s, size_t n)
{
        const wchar_t *z = wmemchr(s, 0, n);
        if (z) n = z-s;
        return n;
}