/* bitvector size */
#define	BV_SETSIZE		1024	/* this number MUST be >= 8! */

typedef unsigned char uint_8;

#define _BV_DELT(b)		((b) >> 0x3)
#define _BV_MASK(b)		(1 << ((b) & 0x7))
#define _BV_BITS(s)		((s)->bits)

/* structure for bitvectors */
typedef struct bv_set
{
  uint_8 bits[_BV_DELT(BV_SETSIZE)];
}bv_set;


/* utility macros */
#define BV_ZERO(s)	\
  do {									\
    unsigned int _i;							\
    for (_i=0; _i<sizeof(_BV_BITS(s)); _i++)				\
      _BV_BITS(s)[_i] = 0;						\
  }while (0);
#define BV_SET(b, s)		(_BV_BITS(s)[_BV_DELT(b)] |= _BV_MASK (b))
#define BV_CLR(b, s)		(_BV_BITS(s)[_BV_DELT(b)] &= ~_BV_MASK (b))
#define BV_ISSET(b, s)		(_BV_BITS(s)[_BV_DELT(b)] & _BV_MASK (b))