t_brkc
# define termForw1Char ntc.t_brkc
# define termForw1Charp (cc_t *)&ntc.t_brkc
if (tc.t_brkc == (cc_t)(_POSIX_VDISABLE))
tc.t_brkc = esc;
*valp = termbuf.tc.t_brkc;