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