Include/longobject.h

   1 #ifndef Py_LONGOBJECT_H
   2 #define Py_LONGOBJECT_H
   3 #ifdef __cplusplus
   4 extern "C" {
   5 #endif
   6
   7
   8 /* Long (arbitrary precision) integer object interface */
   9
  10 typedef struct _longobject PyLongObject; /* Revealed in longintrepr.h */
  11
  12 PyAPI_DATA(PyTypeObject) PyLong_Type;
  13
  14 #define PyLong_Check(op) \
  15                 PyType_FastSubclass(Py_TYPE(op), Py_TPFLAGS_LONG_SUBCLASS)
  16 #define PyLong_CheckExact(op) (Py_TYPE(op) == &PyLong_Type)
  17
  18 PyAPI_FUNC(PyObject *) PyLong_FromLong(long);
  19 PyAPI_FUNC(PyObject *) PyLong_FromUnsignedLong(unsigned long);
  20 PyAPI_FUNC(PyObject *) PyLong_FromDouble(double);
  21 PyAPI_FUNC(PyObject *) PyLong_FromSize_t(size_t);
  22 PyAPI_FUNC(PyObject *) PyLong_FromSsize_t(Py_ssize_t);
  23 PyAPI_FUNC(long) PyLong_AsLong(PyObject *);
  24 PyAPI_FUNC(unsigned long) PyLong_AsUnsignedLong(PyObject *);
  25 PyAPI_FUNC(unsigned long) PyLong_AsUnsignedLongMask(PyObject *);
  26 PyAPI_FUNC(Py_ssize_t) PyLong_AsSsize_t(PyObject *);
  27
  28 /* For use by intobject.c only */
  29 #define _PyLong_AsSsize_t PyLong_AsSsize_t
  30 #define _PyLong_FromSize_t PyLong_FromSize_t
  31 #define _PyLong_FromSsize_t PyLong_FromSsize_t
  32 PyAPI_DATA(int) _PyLong_DigitValue[256];
  33
  34 /* _PyLong_AsScaledDouble returns a double x and an exponent e such that
  35    the true value is approximately equal to x * 2**(SHIFT*e).  e is >= 0.
  36    x is 0.0 if and only if the input is 0 (in which case, e and x are both
  37    zeroes).  Overflow is impossible.  Note that the exponent returned must
  38    be multiplied by SHIFT!  There may not be enough room in an int to store
  39    e*SHIFT directly. */
  40 PyAPI_FUNC(double) _PyLong_AsScaledDouble(PyObject *vv, int *e);
  41
  42 PyAPI_FUNC(double) PyLong_AsDouble(PyObject *);
  43 PyAPI_FUNC(PyObject *) PyLong_FromVoidPtr(void *);
  44 PyAPI_FUNC(void *) PyLong_AsVoidPtr(PyObject *);
  45
  46 #ifdef HAVE_LONG_LONG
  47 PyAPI_FUNC(PyObject *) PyLong_FromLongLong(PY_LONG_LONG);
  48 PyAPI_FUNC(PyObject *) PyLong_FromUnsignedLongLong(unsigned PY_LONG_LONG);
  49 PyAPI_FUNC(PY_LONG_LONG) PyLong_AsLongLong(PyObject *);
  50 PyAPI_FUNC(unsigned PY_LONG_LONG) PyLong_AsUnsignedLongLong(PyObject *);
  51 PyAPI_FUNC(unsigned PY_LONG_LONG) PyLong_AsUnsignedLongLongMask(PyObject *);
  52 #endif /* HAVE_LONG_LONG */
  53
  54 PyAPI_FUNC(PyObject *) PyLong_FromString(char *, char **, int);
  55 #ifdef Py_USING_UNICODE
  56 PyAPI_FUNC(PyObject *) PyLong_FromUnicode(Py_UNICODE*, Py_ssize_t, int);
  57 #endif
  58
  59 /* _PyLong_Sign.  Return 0 if v is 0, -1 if v < 0, +1 if v > 0.
  60    v must not be NULL, and must be a normalized long.
  61    There are no error cases.
  62 */
  63 PyAPI_FUNC(int) _PyLong_Sign(PyObject *v);
  64
  65
  66 /* _PyLong_NumBits.  Return the number of bits needed to represent the
  67    absolute value of a long.  For example, this returns 1 for 1 and -1, 2
  68    for 2 and -2, and 2 for 3 and -3.  It returns 0 for 0.
  69    v must not be NULL, and must be a normalized long.
  70    (size_t)-1 is returned and OverflowError set if the true result doesn't
  71    fit in a size_t.
  72 */
  73 PyAPI_FUNC(size_t) _PyLong_NumBits(PyObject *v);
  74
  75 /* _PyLong_FromByteArray:  View the n unsigned bytes as a binary integer in
  76    base 256, and return a Python long with the same numeric value.
  77    If n is 0, the integer is 0.  Else:
  78    If little_endian is 1/true, bytes[n-1] is the MSB and bytes[0] the LSB;
  79    else (little_endian is 0/false) bytes[0] is the MSB and bytes[n-1] the
  80    LSB.
  81    If is_signed is 0/false, view the bytes as a non-negative integer.
  82    If is_signed is 1/true, view the bytes as a 2's-complement integer,
  83    non-negative if bit 0x80 of the MSB is clear, negative if set.
  84    Error returns:
  85    + Return NULL with the appropriate exception set if there's not
  86      enough memory to create the Python long.
  87 */
  88 PyAPI_FUNC(PyObject *) _PyLong_FromByteArray(
  89         const unsigned char* bytes, size_t n,
  90         int little_endian, int is_signed);
  91
  92 /* _PyLong_AsByteArray: Convert the least-significant 8*n bits of long
  93    v to a base-256 integer, stored in array bytes.  Normally return 0,
  94    return -1 on error.
  95    If little_endian is 1/true, store the MSB at bytes[n-1] and the LSB at
  96    bytes[0]; else (little_endian is 0/false) store the MSB at bytes[0] and
  97    the LSB at bytes[n-1].
  98    If is_signed is 0/false, it's an error if v < 0; else (v >= 0) n bytes
  99    are filled and there's nothing special about bit 0x80 of the MSB.
 100    If is_signed is 1/true, bytes is filled with the 2's-complement
 101    representation of v's value.  Bit 0x80 of the MSB is the sign bit.
 102    Error returns (-1):
 103    + is_signed is 0 and v < 0.  TypeError is set in this case, and bytes
 104      isn't altered.
 105    + n isn't big enough to hold the full mathematical value of v.  For
 106      example, if is_signed is 0 and there are more digits in the v than
 107      fit in n; or if is_signed is 1, v < 0, and n is just 1 bit shy of
 108      being large enough to hold a sign bit.  OverflowError is set in this
 109      case, but bytes holds the least-signficant n bytes of the true value.
 110 */
 111 PyAPI_FUNC(int) _PyLong_AsByteArray(PyLongObject* v,
 112         unsigned char* bytes, size_t n,
 113         int little_endian, int is_signed);
 114
 115 /* _PyLong_Format: Convert the long to a string object with given base,
 116    appending a base prefix of 0[box] if base is 2, 8 or 16.
 117    Add a trailing "L" if addL is non-zero.
 118    If newstyle is zero, then use the pre-2.6 behavior of octal having
 119    a leading "0", instead of the prefix "0o" */
 120 PyAPI_FUNC(PyObject *) _PyLong_Format(PyObject *aa, int base, int addL, int newstyle);
 121
 122 /* Format the object based on the format_spec, as defined in PEP 3101
 123    (Advanced String Formatting). */
 124 PyAPI_FUNC(PyObject *) _PyLong_FormatAdvanced(PyObject *obj,
 125                                               char *format_spec,
 126                                               Py_ssize_t format_spec_len);
 127
 128 #ifdef __cplusplus
 129 }
 130 #endif
 131 #endif /* !Py_LONGOBJECT_H */