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cpython/Parser/bitset.c at tkinter_docs · native-api/cpython · GitHub
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Parser
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bitset.c
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/* 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
++
;
}
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