RBUF_SIZE
rcvbuf[n].rb_pop = &rcvbuf[n].rb_buf[RBUF_SIZE]; \
u_char rb_buf[RBUF_SIZE+4];
#define RBUF_INIT(n) rcvbuf[n].rb_pop = rcvbuf[n].rb_push = &rcvbuf[n].rb_buf[RBUF_SIZE]
rcvbuf[n].rb_push = &rcvbuf[n].rb_buf[RBUF_SIZE]; \