inline bool isAddressInSubnet()

in common/ipprefix.h [108:144]
34 lines of code
6 McCabe index (conditional complexity)

    inline bool isAddressInSubnet(const IpAddress& addr) const
    {
        if (m_ip.getIp().family != addr.getIp().family)
        {
            return false;
        }

        switch (m_ip.getIp().family)
        {
            case AF_INET:
            {
                uint32_t mask = getMask().getV4Addr();
                return (m_ip.getV4Addr() & mask) == (addr.getV4Addr() & mask);
            }
            case AF_INET6:
            {
                const uint8_t *prefix = m_ip.getV6Addr();
                IpAddress ip6mask = getMask();
                const uint8_t *mask = ip6mask.getV6Addr();
                const uint8_t *ip = addr.getV6Addr();

                for (int i = 0; i < 16; ++i)
                {
                    if ((prefix[i] & mask[i]) != (ip[i] & mask[i]))
                    {
                        return false;
                    }
                }

                return true;
            }
            default:
            {
                throw std::logic_error("Invalid family");
            }
        }
    }