ref: a7c01127f9749fe471367c6461cde357403cc3b3
dir: /sys/src/cmd/python/Include/longobject.h/
#ifndef Py_LONGOBJECT_H
#define Py_LONGOBJECT_H
#ifdef __cplusplus
extern "C" {
#endif
/* Long (arbitrary precision) integer object interface */
typedef struct _longobject PyLongObject; /* Revealed in longintrepr.h */
PyAPI_DATA(PyTypeObject) PyLong_Type;
#define PyLong_Check(op) PyObject_TypeCheck(op, &PyLong_Type)
#define PyLong_CheckExact(op) ((op)->ob_type == &PyLong_Type)
PyAPI_FUNC(PyObject *) PyLong_FromLong(long);
PyAPI_FUNC(PyObject *) PyLong_FromUnsignedLong(unsigned long);
PyAPI_FUNC(PyObject *) PyLong_FromDouble(double);
PyAPI_FUNC(long) PyLong_AsLong(PyObject *);
PyAPI_FUNC(unsigned long) PyLong_AsUnsignedLong(PyObject *);
PyAPI_FUNC(unsigned long) PyLong_AsUnsignedLongMask(PyObject *);
/* For use by intobject.c only */
PyAPI_FUNC(Py_ssize_t) _PyLong_AsSsize_t(PyObject *);
PyAPI_FUNC(PyObject *) _PyLong_FromSize_t(size_t);
PyAPI_FUNC(PyObject *) _PyLong_FromSsize_t(Py_ssize_t);
PyAPI_DATA(int) _PyLong_DigitValue[256];
/* _PyLong_AsScaledDouble returns a double x and an exponent e such that
the true value is approximately equal to x * 2**(SHIFT*e). e is >= 0.
x is 0.0 if and only if the input is 0 (in which case, e and x are both
zeroes). Overflow is impossible. Note that the exponent returned must
be multiplied by SHIFT! There may not be enough room in an int to store
e*SHIFT directly. */
PyAPI_FUNC(double) _PyLong_AsScaledDouble(PyObject *vv, int *e);
PyAPI_FUNC(double) PyLong_AsDouble(PyObject *);
PyAPI_FUNC(PyObject *) PyLong_FromVoidPtr(void *);
PyAPI_FUNC(void *) PyLong_AsVoidPtr(PyObject *);
#ifdef HAVE_LONG_LONG
PyAPI_FUNC(PyObject *) PyLong_FromLongLong(PY_LONG_LONG);
PyAPI_FUNC(PyObject *) PyLong_FromUnsignedLongLong(unsigned PY_LONG_LONG);
PyAPI_FUNC(PY_LONG_LONG) PyLong_AsLongLong(PyObject *);
PyAPI_FUNC(unsigned PY_LONG_LONG) PyLong_AsUnsignedLongLong(PyObject *);
PyAPI_FUNC(unsigned PY_LONG_LONG) PyLong_AsUnsignedLongLongMask(PyObject *);
#endif /* HAVE_LONG_LONG */
PyAPI_FUNC(PyObject *) PyLong_FromString(char *, char **, int);
#ifdef Py_USING_UNICODE
PyAPI_FUNC(PyObject *) PyLong_FromUnicode(Py_UNICODE*, Py_ssize_t, int);
#endif
/* _PyLong_Sign. Return 0 if v is 0, -1 if v < 0, +1 if v > 0.
v must not be NULL, and must be a normalized long.
There are no error cases.
*/
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.
(size_t)-1 is returned and OverflowError set if the true result doesn't
fit in a size_t.
*/
PyAPI_FUNC(size_t) _PyLong_NumBits(PyObject *v);
/* _PyLong_FromByteArray: View the n unsigned bytes as a binary integer in
base 256, and return a Python long 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 long.
*/
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-signficant 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);
#ifdef __cplusplus
}
#endif
#endif /* !Py_LONGOBJECT_H */