bitset.h

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#ifndef Py_BITSET_H
#define Py_BITSET_H
#ifdef __cplusplus
extern "C" {
#endif

/* Bitset interface */

#define BYTE        char

typedef BYTE *bitset;

bitset newbitset(int nbits);
void delbitset(bitset bs);
#define testbit(ss, ibit) (((ss)[BIT2BYTE(ibit)] & BIT2MASK(ibit)) != 0)
int addbit(bitset bs, int ibit); /* Returns 0 if already set */
int samebitset(bitset bs1, bitset bs2, int nbits);
void mergebitset(bitset bs1, bitset bs2, int nbits);

#define BITSPERBYTE (8*sizeof(BYTE))
#define NBYTES(nbits)   (((nbits) + BITSPERBYTE - 1) / BITSPERBYTE)

#define BIT2BYTE(ibit)  ((ibit) / BITSPERBYTE)
#define BIT2SHIFT(ibit) ((ibit) % BITSPERBYTE)
#define BIT2MASK(ibit)  (1 << BIT2SHIFT(ibit))
#define BYTE2BIT(ibyte) ((ibyte) * BITSPERBYTE)

#ifdef __cplusplus
}
#endif
#endif /* !Py_BITSET_H */