gistfile1.txt

static int lookup(MMDB_root_entry_s * root, const char *ipstr)
{
    struct in_addr ip;
    struct in6_addr ip6;
    int ai_flags = AI_NUMERICHOST|AI_V4MAPPED;
    int status;

    int depth = root->entry.mmdb->depth;

    if (ipstr == NULL) {
        croak("MaxMind::DB::Reader::XS address to lookup is NULL");
    }

    if (depth == 32) {
        if (0 != MMDB_lookupaddressX(ipstr, AF_INET, ai_flags, &ip)) {
            croak("MaxMind::DB::Reader::XS Invalid IPv4 Address");
        }

        status = MMDB_lookup_by_ipnum(htonl(ip.s_addr), root);
    }
    else {
        if (0 != MMDB_lookupaddressX(ipstr, AF_INET6, ai_flags, &ip6)) {
            croak("MaxMind::DB::Reader::XS Invalid IPv6 Address");
        }

        status = MMDB_lookup_by_ipnum_128(ip6, root);
    }

    if (status != MMDB_SUCCESS) {
        croak("MaxMind::DB::Reader::XS lookup Err %d", status);
    }
    return status;
}