v_keyval
v_keyval(sp, K_CNTRLD, KEY_VEOF);
v_keyval(sp, K_VERASE, KEY_VERASE);
v_keyval(sp, K_VKILL, KEY_VKILL);
v_keyval(sp, K_VWERASE, KEY_VWERASE);
static void v_keyval(SCR *, int, scr_keyval_t);