th_msg
snprintf(tp->th_msg, MAXPKTSIZE - 4, "%s%n", pe->e_msg, &length);
tftp_log(LOG_DEBUG, "Sending ERROR %d: %s", error, tp->th_msg);
"Got ERROR packet: %s", pkt->th_msg);
wtail = wbuf.t.th_msg;
tftp_log(LOG_ERR, "Error code %d: %s", rp->th_code, rp->th_msg);