_mvleft
rl = _mvleft(curx, newx, FALSE);
rl = _mvleft(curx, newx, TRUE);
st = cx < nx ? _mvright(cx, nx, FALSE) : _mvleft(cx, nx, FALSE);
(void) _mvleft(cx, nx, TRUE);
_mvright(int, int, int), _mvleft(int, int, int);