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cpython/Include/cpython/longobject.h at 3.15 · python/cpython · GitHub
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#ifndef
Py_CPYTHON_LONGOBJECT_H
# error
"this header file must not be included directly"
#endif
#define
_PyLong_CAST
(
op
) \
(assert(PyLong_Check(op)), _Py_CAST(PyLongObject*, (op)))
PyAPI_FUNC
(
PyObject
*
)
PyLong_FromUnicodeObject
(
PyObject
*
u
,
int
base
);
PyAPI_FUNC
(
int
)
PyUnstable_Long_IsCompact
(
const
PyLongObject
*
op
);
PyAPI_FUNC
(
Py_ssize_t
)
PyUnstable_Long_CompactValue
(
const
PyLongObject
*
op
);
/* PyLong_IsPositive. Check if the integer object is positive.
- On success, return 1 if *obj is positive, and 0 otherwise.
- On failure, set an exception, and return -1. */
PyAPI_FUNC
(
int
)
PyLong_IsPositive
(
PyObject
*
obj
);
/* PyLong_IsNegative. Check if the integer object is negative.
- On success, return 1 if *obj is negative, and 0 otherwise.
- On failure, set an exception, and return -1. */
PyAPI_FUNC
(
int
)
PyLong_IsNegative
(
PyObject
*
obj
);
/* PyLong_IsZero. Check if the integer object is zero.
- On success, return 1 if *obj is zero, and 0 if it is non-zero.
- On failure, set an exception, and return -1. */
PyAPI_FUNC
(
int
)
PyLong_IsZero
(
PyObject
*
obj
);
/* PyLong_GetSign. Get the sign of an integer object:
0, -1 or +1 for zero, negative or positive integer, respectively.
- On success, set '*sign' to the integer sign, and return 0.
- On failure, set an exception, and return -1. */
PyAPI_FUNC
(
int
)
PyLong_GetSign
(
PyObject
*
v
,
int
*
sign
);
Py_DEPRECATED
(
3.14
)
PyAPI_FUNC
(
int
)
_PyLong_Sign
(
PyObject
*
v
);
/* _PyLong_NumBits. Return the number of bits needed to represent the
absolute value of a long. For example, this returns 1 for 1 and -1, 2
for 2 and -2, and 2 for 3 and -3. It returns 0 for 0.
v must not be NULL, and must be a normalized long.
Always successful.
*/
PyAPI_FUNC
(
int64_t
)
_PyLong_NumBits
(
PyObject
*
v
);
/* _PyLong_FromByteArray: View the n unsigned bytes as a binary integer in
base 256, and return a Python int with the same numeric value.
If n is 0, the integer is 0. Else:
If little_endian is 1/true, bytes[n-1] is the MSB and bytes[0] the LSB;
else (little_endian is 0/false) bytes[0] is the MSB and bytes[n-1] the
LSB.
If is_signed is 0/false, view the bytes as a non-negative integer.
If is_signed is 1/true, view the bytes as a 2's-complement integer,
non-negative if bit 0x80 of the MSB is clear, negative if set.
Error returns:
+ Return NULL with the appropriate exception set if there's not
enough memory to create the Python int.
*/
PyAPI_FUNC
(
PyObject
*
)
_PyLong_FromByteArray
(
const
unsigned
char
*
bytes
,
size_t
n
,
int
little_endian
,
int
is_signed
);
/* _PyLong_AsByteArray: Convert the least-significant 8*n bits of long
v to a base-256 integer, stored in array bytes. Normally return 0,
return -1 on error.
If little_endian is 1/true, store the MSB at bytes[n-1] and the LSB at
bytes[0]; else (little_endian is 0/false) store the MSB at bytes[0] and
the LSB at bytes[n-1].
If is_signed is 0/false, it's an error if v < 0; else (v >= 0) n bytes
are filled and there's nothing special about bit 0x80 of the MSB.
If is_signed is 1/true, bytes is filled with the 2's-complement
representation of v's value. Bit 0x80 of the MSB is the sign bit.
Error returns (-1):
+ is_signed is 0 and v < 0. TypeError is set in this case, and bytes
isn't altered.
+ n isn't big enough to hold the full mathematical value of v. For
example, if is_signed is 0 and there are more digits in the v than
fit in n; or if is_signed is 1, v < 0, and n is just 1 bit shy of
being large enough to hold a sign bit. OverflowError is set in this
case, but bytes holds the least-significant n bytes of the true value.
*/
PyAPI_FUNC
(
int
)
_PyLong_AsByteArray
(
PyLongObject
*
v
,
unsigned
char
*
bytes
,
size_t
n
,
int
little_endian
,
int
is_signed
,
int
with_exceptions
);
/* For use by the gcd function in mathmodule.c */
PyAPI_FUNC
(
PyObject
*
)
_PyLong_GCD
(
PyObject
*
,
PyObject
*
);
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