roundup
roundup(char *s0, int ndigits)
#define roundup(X, N) ((((X) + ((N) - 1))/(N))*(N))
#define roundup(v,s) ((v + ((s) - 1)) & (~((s) - 1)))
#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
#undef roundup
#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))