mirror of https://github.com/python/cpython.git
77 lines
974 B
C
77 lines
974 B
C
/* Bitset primitives */
|
|
|
|
#include "PROTO.h"
|
|
#include "malloc.h"
|
|
#include "bitset.h"
|
|
|
|
bitset
|
|
newbitset(nbits)
|
|
int nbits;
|
|
{
|
|
int nbytes = NBYTES(nbits);
|
|
bitset ss = NEW(BYTE, nbytes);
|
|
|
|
if (ss == NULL)
|
|
fatal("no mem for bitset");
|
|
|
|
ss += nbytes;
|
|
while (--nbytes >= 0)
|
|
*--ss = 0;
|
|
return ss;
|
|
}
|
|
|
|
void
|
|
delbitset(ss)
|
|
bitset ss;
|
|
{
|
|
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++;
|
|
}
|