SCROLL_Y
if (++sc_line >= SCROLL_Y)
scroll_w = newwin(SCROLL_Y, SCROLL_X, SCROLL_T, SCROLL_L);
(void) wmove(scroll_w, SCROLL_Y - 1, 0);
#define SCREENTEST() (initscr() != NULL && signal(SIGTSTP, SIG_DFL) != SIG_ERR && STAT_R < COLS && SCROLL_Y > 0)
#define SCREENTEST() (initscr() != NULL && STAT_R < COLS && SCROLL_Y > 0)