KBDMUX_Q_SIZE
if (state->ks_inq_length == KBDMUX_Q_SIZE)
p = (state->ks_inq_start + state->ks_inq_length) % KBDMUX_Q_SIZE;
state->ks_inq_start = (state->ks_inq_start + 1) % KBDMUX_Q_SIZE;
char ks_inq[KBDMUX_Q_SIZE]; /* input chars queue */