| 1 | n/a | |
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| 2 | n/a | /* Bitset primitives used by the parser generator */ |
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| 3 | n/a | |
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| 4 | n/a | #include "pgenheaders.h" |
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| 5 | n/a | #include "bitset.h" |
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| 6 | n/a | |
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| 7 | n/a | bitset |
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| 8 | n/a | newbitset(int nbits) |
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| 9 | n/a | { |
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| 10 | n/a | int nbytes = NBYTES(nbits); |
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| 11 | n/a | bitset ss = (char *)PyObject_MALLOC(sizeof(BYTE) * nbytes); |
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| 12 | n/a | |
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| 13 | n/a | if (ss == NULL) |
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| 14 | n/a | Py_FatalError("no mem for bitset"); |
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| 15 | n/a | |
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| 16 | n/a | ss += nbytes; |
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| 17 | n/a | while (--nbytes >= 0) |
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| 18 | n/a | *--ss = 0; |
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| 19 | n/a | return ss; |
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| 20 | n/a | } |
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| 21 | n/a | |
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| 22 | n/a | void |
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| 23 | n/a | delbitset(bitset ss) |
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| 24 | n/a | { |
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| 25 | n/a | PyObject_FREE(ss); |
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| 26 | n/a | } |
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| 27 | n/a | |
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| 28 | n/a | int |
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| 29 | n/a | addbit(bitset ss, int ibit) |
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| 30 | n/a | { |
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| 31 | n/a | int ibyte = BIT2BYTE(ibit); |
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| 32 | n/a | BYTE mask = BIT2MASK(ibit); |
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| 33 | n/a | |
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| 34 | n/a | if (ss[ibyte] & mask) |
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| 35 | n/a | return 0; /* Bit already set */ |
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| 36 | n/a | ss[ibyte] |= mask; |
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| 37 | n/a | return 1; |
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| 38 | n/a | } |
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| 39 | n/a | |
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| 40 | n/a | #if 0 /* Now a macro */ |
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| 41 | n/a | int |
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| 42 | n/a | testbit(bitset ss, int ibit) |
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| 43 | n/a | { |
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| 44 | n/a | return (ss[BIT2BYTE(ibit)] & BIT2MASK(ibit)) != 0; |
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| 45 | n/a | } |
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| 46 | n/a | #endif |
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| 47 | n/a | |
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| 48 | n/a | int |
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| 49 | n/a | samebitset(bitset ss1, bitset ss2, int nbits) |
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| 50 | n/a | { |
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| 51 | n/a | int i; |
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| 52 | n/a | |
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| 53 | n/a | for (i = NBYTES(nbits); --i >= 0; ) |
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| 54 | n/a | if (*ss1++ != *ss2++) |
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| 55 | n/a | return 0; |
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| 56 | n/a | return 1; |
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| 57 | n/a | } |
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| 58 | n/a | |
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| 59 | n/a | void |
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| 60 | n/a | mergebitset(bitset ss1, bitset ss2, int nbits) |
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| 61 | n/a | { |
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| 62 | n/a | int i; |
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| 63 | n/a | |
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| 64 | n/a | for (i = NBYTES(nbits); --i >= 0; ) |
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| 65 | n/a | *ss1++ |= *ss2++; |
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| 66 | n/a | } |
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