TTYHOG
if (((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= (TTYHOG-2))
#define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
clist_alloc_cblocks(&tp->t_canq, TTYHOG);
cps = TTYHOG - 2 * 256;
if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
tp->t_canq.c_cc < TTYHOG - 1) {
cc = imin(cc, TTYHOG - 1 - tp->t_canq.c_cc);
#ifndef TTYHOG