#define PS(xp) (((struct data_packet *)&xp -> packet_type)->ps)
#define MBIT(xp) (((struct data_packet *)&xp -> packet_type)->m_bit)
#define LCN(xp) (xp -> logical_channel_number + \
#define PS(xp) (((struct data_packet *)&xp -> packet_type)->ps)
#define MBIT(xp) (((struct data_packet *)&xp -> packet_type)->m_bit)
#define LCN(xp) (xp -> logical_channel_number + \