roundup
# define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
#define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */
#define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */
#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))