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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision 6046c5e0298c25515ea58abc8ab87f7413e3f743 authored by Barry Warsaw on 03 December 2008, 17:29:10 UTC, committed by Barry Warsaw on 03 December 2008, 17:29:10 UTC 
Oops, one revision we forgot.
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Tip revision: 6046c5e0298c25515ea58abc8ab87f7413e3f743 authored by Barry Warsaw on 03 December 2008, 17:29:10 UTC
Oops, one revision we forgot.
Tip revision: 6046c5e
bitset.h 

#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 */
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