sldns_rr_tcttl_scan
w += sldns_rr_tcttl_scan(d, dlen, s, slen);
w += sldns_rr_tcttl_scan(d, dlen, s, slen);
w += sldns_rr_tcttl_scan(d, dlen, s, slen);
w += sldns_rr_tcttl_scan(d, dlen, s, slen);