mirror of
https://github.com/python/cpython.git
synced 2024-11-28 20:33:54 +08:00
92 lines
1.5 KiB
C
92 lines
1.5 KiB
C
/***********************************************************
|
|
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
|
|
The Netherlands.
|
|
|
|
All Rights Reserved
|
|
|
|
Copyright (c) 2000, BeOpen.com.
|
|
Copyright (c) 1995-2000, Corporation for National Research Initiatives.
|
|
Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
|
|
All rights reserved.
|
|
|
|
See the file "Misc/COPYRIGHT" for information on usage and
|
|
redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
|
|
|
******************************************************************/
|
|
|
|
/* Bitset primitives used by the parser generator */
|
|
|
|
#include "pgenheaders.h"
|
|
#include "bitset.h"
|
|
|
|
bitset
|
|
newbitset(nbits)
|
|
int nbits;
|
|
{
|
|
int nbytes = NBYTES(nbits);
|
|
bitset ss = PyMem_NEW(BYTE, nbytes);
|
|
|
|
if (ss == NULL)
|
|
Py_FatalError("no mem for bitset");
|
|
|
|
ss += nbytes;
|
|
while (--nbytes >= 0)
|
|
*--ss = 0;
|
|
return ss;
|
|
}
|
|
|
|
void
|
|
delbitset(ss)
|
|
bitset ss;
|
|
{
|
|
PyMem_DEL(ss);
|
|
}
|
|
|
|
int
|
|
addbit(ss, ibit)
|
|
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(ss, ibit)
|
|
bitset ss;
|
|
int ibit;
|
|
{
|
|
return (ss[BIT2BYTE(ibit)] & BIT2MASK(ibit)) != 0;
|
|
}
|
|
#endif
|
|
|
|
int
|
|
samebitset(ss1, ss2, nbits)
|
|
bitset ss1, ss2;
|
|
int nbits;
|
|
{
|
|
int i;
|
|
|
|
for (i = NBYTES(nbits); --i >= 0; )
|
|
if (*ss1++ != *ss2++)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
mergebitset(ss1, ss2, nbits)
|
|
bitset ss1, ss2;
|
|
int nbits;
|
|
{
|
|
int i;
|
|
|
|
for (i = NBYTES(nbits); --i >= 0; )
|
|
*ss1++ |= *ss2++;
|
|
}
|