dns_name4_domain - construct host name for reverse lookup

       dns_name4_domain is a low-level component of dns_name4.  It converts an IP address such as 1.2.3.4 into a
       domain name such as 4.3.2.1.in-addr.arpa and places the packet-encoded domain name into q.

       q is zero terminated.

       q must have space for DNS_NAME4_DOMAIN bytes.

       dns_name4_domain - construct host name for reverse lookup

dns_name4(3), dns_name6_domain(3)

                                                                                             dns_name4_domain(3)

#include<libowfat/dns.h>

       void dns_name4_domain(char q[DNS_NAME4_DOMAIN],
                            const char* ip[4]);