_asr_make_fqdn
if (_asr_make_fqdn(domain, NULL, buf, sizeof(buf)) == 0)
size_t _asr_make_fqdn(const char *, const char *, char *, size_t);
if (_asr_make_fqdn(name, domain, fqdn, sizeof fqdn) == 0) {
r = _asr_make_fqdn(name, domain, buf, buflen);
if (_asr_make_fqdn(name, dom, fqdn, sizeof(fqdn)) > sizeof(fqdn)) {