SURROGATE_LOW
if (!(*uniname & SURROGATE_LOW) &&
(*(uniname+1) & SURROGATE_LOW)) {
SURROGATE_LOW |
if (u & SURROGATE_LOW) {
!(v & SURROGATE_LOW)) {
SURROGATE_PAIR | SURROGATE_LOW |
uni_char = SURROGATE_PAIR | SURROGATE_LOW |
if (c & SURROGATE_LOW) {
!(next & SURROGATE_LOW)) {