| /* Bitset interface */ |
| |
| #define BYTE char |
| |
| typedef BYTE *bitset; |
| |
| bitset newbitset PROTO((int nbits)); |
| void delbitset PROTO((bitset bs)); |
| /* int testbit PROTO((bitset bs, int ibit)); /* Now a macro, see below */ |
| int addbit PROTO((bitset bs, int ibit)); /* Returns 0 if already set */ |
| int samebitset PROTO((bitset bs1, bitset bs2, int nbits)); |
| void mergebitset PROTO((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) |
| |
| #define testbit(ss, ibit) (((ss)[BIT2BYTE(ibit)] & BIT2MASK(ibit)) != 0) |