N_ROWS
abs_end = N_COLS(dconf) * N_ROWS(dconf);
u_int buf_end = (N_COLS(dconf) + 1) * N_ROWS(dconf);
#define WS_NROWS(scr) N_ROWS((scr)->scr_dconf)
#define MAXROW(dconf) (N_ROWS(dconf) - 1)