ncm_pointer16
+ sizeof(struct ncm_pointer16))
struct ncm_pointer16 datagram[2];
struct ncm_pointer16 *ptr;
ptr = (struct ncm_pointer16 *)(hdr + 1);
struct ncm_pointer16 *ptr16;
ptr16 = (struct ncm_pointer16 *)(buf + ptroff);
dgentryoff = offsetof(struct ncm_pointer16, dgram);
sizeof(struct ncm_pointer16);
(sizeof(struct ncm_header16) + sizeof(struct ncm_pointer16))