__CHAR_BIT
#define NDENTRIES (NDSLOTSIZE * __CHAR_BIT)
#define CHAR_BIT __CHAR_BIT /* number of bits in a char */
#define CHAR_WIDTH __CHAR_BIT /* number of bits in a char */
#define SCHAR_WIDTH __CHAR_BIT /* number of bits in a signed char */
#define UCHAR_WIDTH __CHAR_BIT /* number of bits in an unsigned char */
#define NDENTRIES (NDSLOTSIZE * __CHAR_BIT)