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_PyLong_NumBits(): The definition of this was too specific to the quirky

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needs of pickling longs.  Backed off to a definition that's much easier
to understand.  The pickler will have to work a little harder, but other
uses are more likely to be correct <0.5 wink>.

_PyLong_Sign():  New teensy function to characterize a long, as to <0, ==0,
or >0.
This commit is contained in:
Tim Peters 2003-01-31 15:52:05 +00:00
parent 89fc4f3e56
commit 5b8132ffa3
3 changed files with 55 additions and 34 deletions
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16
Include/longobject.h
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@ -44,11 +44,17 @@ PyAPI_FUNC(PyObject *) PyLong_FromString(char *, char **, int);
PyAPI_FUNC(PyObject *) PyLong_FromUnicode(Py_UNICODE*, int, int);
#endif
/* _PyLong_NumBits. Return the number of bits needed to represent a long
in contiguous 2's-complement form, including 1 for the sign bit. For
example, this returns 1 for 0, and 2 for 1 and -1. Note that the
ceiling of this divided by 8 is the number of bytes needed by
_PyLong_AsByteArray to store the long in 256's-complement form.
/* _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);
PyAPI_FUNC(size_t) _PyLong_NumBits(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.