mirror of
https://github.com/python/cpython.git
synced 2024-11-25 02:44:06 +08:00
91 lines
3.7 KiB
C
91 lines
3.7 KiB
C
#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 *);
|
|
|
|
/* _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(LONG_LONG);
|
|
PyAPI_FUNC(PyObject *) PyLong_FromUnsignedLongLong(unsigned LONG_LONG);
|
|
PyAPI_FUNC(LONG_LONG) PyLong_AsLongLong(PyObject *);
|
|
PyAPI_FUNC(unsigned LONG_LONG) PyLong_AsUnsignedLongLong(PyObject *);
|
|
#endif /* HAVE_LONG_LONG */
|
|
|
|
PyAPI_FUNC(PyObject *) PyLong_FromString(char *, char **, int);
|
|
#ifdef Py_USING_UNICODE
|
|
PyAPI_FUNC(PyObject *) PyLong_FromUnicode(Py_UNICODE*, int, int);
|
|
#endif
|
|
|
|
/* _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 */
|