#define LENGTH(x) (sizeof x / sizeof x[0])
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))
-#define MAXTAGLEN 16
#define MOUSEMASK (BUTTONMASK|PointerMotionMask)
#define WIDTH(x) ((x)->w + 2 * (x)->bw)
#define HEIGHT(x) ((x)->h + 2 * (x)->bw)