tftp_parse_oack
if (tftp_parse_oack(h, t->th_u.tu_stuff, tftp_oack_len) != 0) {
static int tftp_parse_oack(struct tftp_handle *, char *, size_t);
tftp_parse_oack((char *)&tftp->th_stuff,
tftp_parse_oack((char *)&tftp->th_stuff,
static char *tftp_parse_oack(char *, size_t, struct tftp_options *);