23 lines
771 B
C
23 lines
771 B
C
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/* Bitset interface */
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#define BYTE char
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typedef BYTE *bitset;
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bitset newbitset PROTO((int nbits));
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void delbitset PROTO((bitset bs));
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/* int testbit PROTO((bitset bs, int ibit)); /* Now a macro, see below */
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int addbit PROTO((bitset bs, int ibit)); /* Returns 0 if already set */
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int samebitset PROTO((bitset bs1, bitset bs2, int nbits));
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void mergebitset PROTO((bitset bs1, bitset bs2, int nbits));
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#define BITSPERBYTE (8*sizeof(BYTE))
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#define NBYTES(nbits) (((nbits) + BITSPERBYTE - 1) / BITSPERBYTE)
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#define BIT2BYTE(ibit) ((ibit) / BITSPERBYTE)
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#define BIT2SHIFT(ibit) ((ibit) % BITSPERBYTE)
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#define BIT2MASK(ibit) (1 << BIT2SHIFT(ibit))
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#define BYTE2BIT(ibyte) ((ibyte) * BITSPERBYTE)
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#define testbit(ss, ibit) (((ss)[BIT2BYTE(ibit)] & BIT2MASK(ibit)) != 0)
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