dns_name4 - look up host name

       dns_name4  looks up the domain name for the 4-byte IP address in ip. It puts the (first) domain name into
       out and returns 0. If the relevant in-addr.arpa domain does not exist in DNS, or has no PTR records,  out
       will be empty.

       If  dns_name4  has  trouble  with  the  DNS  lookup  or  runs out of memory, it returns -1, setting errno
       appropriately. It may or may not change out.

       dns_name4 - look up host name

dns_name_packet(3), dns_name4_domain(3), dns_name6(3), dns_ip4(3)

                                                                                                    dns_name4(3)

#include<libowfat/dns.h>

       int dns_name4(stralloc* out,const char* ip[4]);