parport_pc_read_data
r = parport_pc_read_data(pb);
r = parport_pc_read_data(pb);
if (parport_pc_read_data(pb) != 0x55)
if (parport_pc_read_data(pb) != 0xaa)
.read_data = parport_pc_read_data,
#define parport_read_data(p) parport_pc_read_data(p)