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- refs/heads/3.6
- refs/heads/3.7
- refs/heads/3.8
- refs/heads/3.9
- refs/heads/bpo-45514/deprecate-importlib-resources-legacy
- refs/heads/buildbot-custom
- refs/heads/main
- refs/heads/revert-29124-bpo-44019
- refs/tags/v0.9.8
- refs/tags/v0.9.9
- refs/tags/v1.0.1
- refs/tags/v1.0.2
- refs/tags/v1.1
- refs/tags/v1.1.1
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- refs/tags/v1.5
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- v3.7.1rc2
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- v3.6.8rc1
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- v3.6.7rc2
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Tip revision: 13c94747c74437e594b7fc242ff7da668e81887c authored by Ned Deily on 15 August 2020, 05:20:16 UTC
3.7.9
3.7.9
Tip revision: 13c9474
bitset.c
/* Bitset primitives used by the parser generator */
#include "pgenheaders.h"
#include "bitset.h"
bitset
newbitset(int nbits)
{
int nbytes = NBYTES(nbits);
bitset ss = (char *)PyObject_MALLOC(sizeof(BYTE) * nbytes);
if (ss == NULL)
Py_FatalError("no mem for bitset");
ss += nbytes;
while (--nbytes >= 0)
*--ss = 0;
return ss;
}
void
delbitset(bitset ss)
{
PyObject_FREE(ss);
}
int
addbit(bitset ss, int ibit)
{
int ibyte = BIT2BYTE(ibit);
BYTE mask = BIT2MASK(ibit);
if (ss[ibyte] & mask)
return 0; /* Bit already set */
ss[ibyte] |= mask;
return 1;
}
#if 0 /* Now a macro */
int
testbit(bitset ss, int ibit)
{
return (ss[BIT2BYTE(ibit)] & BIT2MASK(ibit)) != 0;
}
#endif
int
samebitset(bitset ss1, bitset ss2, int nbits)
{
int i;
for (i = NBYTES(nbits); --i >= 0; )
if (*ss1++ != *ss2++)
return 0;
return 1;
}
void
mergebitset(bitset ss1, bitset ss2, int nbits)
{
int i;
for (i = NBYTES(nbits); --i >= 0; )
*ss1++ |= *ss2++;
}