1 #ifndef Py_CPYTHON_LONGOBJECT_H
2 # error "this header file must not be included directly"
3 #endif
4
5 PyAPI_FUNC(int) _PyLong_AsInt(PyObject *);
6
7 PyAPI_FUNC(int) _PyLong_UnsignedShort_Converter(PyObject *, void *);
8 PyAPI_FUNC(int) _PyLong_UnsignedInt_Converter(PyObject *, void *);
9 PyAPI_FUNC(int) _PyLong_UnsignedLong_Converter(PyObject *, void *);
10 PyAPI_FUNC(int) _PyLong_UnsignedLongLong_Converter(PyObject *, void *);
11 PyAPI_FUNC(int) _PyLong_Size_t_Converter(PyObject *, void *);
12
13 /* _PyLong_Frexp returns a double x and an exponent e such that the
14 true value is approximately equal to x * 2**e. e is >= 0. x is
15 0.0 if and only if the input is 0 (in which case, e and x are both
16 zeroes); otherwise, 0.5 <= abs(x) < 1.0. On overflow, which is
17 possible if the number of bits doesn't fit into a Py_ssize_t, sets
18 OverflowError and returns -1.0 for x, 0 for e. */
19 PyAPI_FUNC(double) _PyLong_Frexp(PyLongObject *a, Py_ssize_t *e);
20
21 PyAPI_FUNC(PyObject *) PyLong_FromUnicodeObject(PyObject *u, int base);
22 PyAPI_FUNC(PyObject *) _PyLong_FromBytes(const char *, Py_ssize_t, int);
23
24 /* _PyLong_Sign. Return 0 if v is 0, -1 if v < 0, +1 if v > 0.
25 v must not be NULL, and must be a normalized long.
26 There are no error cases.
27 */
28 PyAPI_FUNC(int) _PyLong_Sign(PyObject *v);
29
30 /* _PyLong_NumBits. Return the number of bits needed to represent the
31 absolute value of a long. For example, this returns 1 for 1 and -1, 2
32 for 2 and -2, and 2 for 3 and -3. It returns 0 for 0.
33 v must not be NULL, and must be a normalized long.
34 (size_t)-1 is returned and OverflowError set if the true result doesn't
35 fit in a size_t.
36 */
37 PyAPI_FUNC(size_t) _PyLong_NumBits(PyObject *v);
38
39 /* _PyLong_DivmodNear. Given integers a and b, compute the nearest
40 integer q to the exact quotient a / b, rounding to the nearest even integer
41 in the case of a tie. Return (q, r), where r = a - q*b. The remainder r
42 will satisfy abs(r) <= abs(b)/2, with equality possible only if q is
43 even.
44 */
45 PyAPI_FUNC(PyObject *) _PyLong_DivmodNear(PyObject *, PyObject *);
46
47 /* _PyLong_FromByteArray: View the n unsigned bytes as a binary integer in
48 base 256, and return a Python int with the same numeric value.
49 If n is 0, the integer is 0. Else:
50 If little_endian is 1/true, bytes[n-1] is the MSB and bytes[0] the LSB;
51 else (little_endian is 0/false) bytes[0] is the MSB and bytes[n-1] the
52 LSB.
53 If is_signed is 0/false, view the bytes as a non-negative integer.
54 If is_signed is 1/true, view the bytes as a 2's-complement integer,
55 non-negative if bit 0x80 of the MSB is clear, negative if set.
56 Error returns:
57 + Return NULL with the appropriate exception set if there's not
58 enough memory to create the Python int.
59 */
60 PyAPI_FUNC(PyObject *) _PyLong_FromByteArray(
61 const unsigned char* bytes, size_t n,
62 int little_endian, int is_signed);
63
64 /* _PyLong_AsByteArray: Convert the least-significant 8*n bits of long
65 v to a base-256 integer, stored in array bytes. Normally return 0,
66 return -1 on error.
67 If little_endian is 1/true, store the MSB at bytes[n-1] and the LSB at
68 bytes[0]; else (little_endian is 0/false) store the MSB at bytes[0] and
69 the LSB at bytes[n-1].
70 If is_signed is 0/false, it's an error if v < 0; else (v >= 0) n bytes
71 are filled and there's nothing special about bit 0x80 of the MSB.
72 If is_signed is 1/true, bytes is filled with the 2's-complement
73 representation of v's value. Bit 0x80 of the MSB is the sign bit.
74 Error returns (-1):
75 + is_signed is 0 and v < 0. TypeError is set in this case, and bytes
76 isn't altered.
77 + n isn't big enough to hold the full mathematical value of v. For
78 example, if is_signed is 0 and there are more digits in the v than
79 fit in n; or if is_signed is 1, v < 0, and n is just 1 bit shy of
80 being large enough to hold a sign bit. OverflowError is set in this
81 case, but bytes holds the least-significant n bytes of the true value.
82 */
83 PyAPI_FUNC(int) _PyLong_AsByteArray(PyLongObject* v,
84 unsigned char* bytes, size_t n,
85 int little_endian, int is_signed);
86
87 /* _PyLong_Format: Convert the long to a string object with given base,
88 appending a base prefix of 0[box] if base is 2, 8 or 16. */
89 PyAPI_FUNC(PyObject *) _PyLong_Format(PyObject *obj, int base);
90
91 /* For use by the gcd function in mathmodule.c */
92 PyAPI_FUNC(PyObject *) _PyLong_GCD(PyObject *, PyObject *);
93
94 PyAPI_FUNC(PyObject *) _PyLong_Rshift(PyObject *, size_t);
95 PyAPI_FUNC(PyObject *) _PyLong_Lshift(PyObject *, size_t);
96
97
98 PyAPI_FUNC(int) PyUnstable_Long_IsCompact(const PyLongObject* op);
99 PyAPI_FUNC(Py_ssize_t) PyUnstable_Long_CompactValue(const PyLongObject* op);
100