telnet/telnet/ring.c

43  *	full:	[consume, supply)
44  *	empty:	[supply, consume)
71 #define	ring_empty(d) (((d)->consume == (d)->supply) && \
73 #define	ring_full(d) (((d)->supply == (d)->consume) && \
89     ring->supply = ring->consume = ring->bottom = buffer;
109     ring->mark = ring_decrement(ring, ring->supply, 1);
142     ring->supply = ring_increment(ring, ring->supply, count);
174 	ring->consume = ring->supply = ring->bottom;
190 	return ring_subtract(ring, ring->consume, ring->supply);
198     if ((ring->consume < ring->supply) || ring_empty(ring)) {
200 			     * if consume is "below" supply, or empty, then
203 	return ring_subtract(ring, ring->top, ring->supply);
208 	return ring_subtract(ring, ring->consume, ring->supply);
223 	    return ring_subtract(ring, ring->supply, ring->consume);
238 	if ((ring->supply < ring->consume) || ring_full(ring)) {
241 	    return ring_subtract(ring, ring->supply, ring->consume);
253  * Move data into the "supply" portion of of the ring buffer.
262 	memmove(ring->supply, buffer, i);
295     if (ring_empty(ring) || ring->clearto == ring->supply)
301     s = ring->supply;
309     ring->clearto = ring->supply;
316 	ring->clearto = ring->supply;