ar_tha
uint8_t *tha = ar_tha(arph);
uint8_t ar_tha[]; /* target hardware address (!IEEE1394) */
void *tha = ar_tha(ah);
tha = ar_tha(ah);
tha = ar_tha(ah);
tha = ar_tha(ah);
tha = ar_tha(ah);
memcpy(ar_tha(ah), taddr, ah->ar_hln);
uint8_t *tha = ar_tha(ap);
ether_ntoa((struct ether_addr *)ar_tha(ap)), hp->h_name);
ether_ntoa((struct ether_addr *)ar_tha(ap)), hp->h_name);