MAXNBUF
#define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
#define MAXNBUF (sizeof(intmax_t) * CHAR_BIT + 1)
#define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
#define MAXNBUF (sizeof(intmax_t) * NBBY + 1)