[Patches] [ python-Patches-1538606 ] Patch to fix __index__() clipping

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Patches item #1538606, was opened at 2006-08-11 04:51
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Category: Core (C code)
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Submitted By: Travis Oliphant (teoliphant)
Assigned to: Nobody/Anonymous (nobody)
Summary: Patch to fix __index__() clipping

Initial Comment:
This is a patch that builds off of Nick Coghlan's work
to fix the __index__() clipping problem.  

It defines 3 New C-API calls (1 is a macro):

int PyIndex_Check(obj) -- does this object have nb_index

PyObject* PyNumber_Index(obj) -- return nb_index(obj)
if possible

Py_ssize_t PyNumber_AsSsize_t(obj, err) -- return obj
as Py_ssize_t by frist going through nb_index(obj)
which returns an integer or long integer.  If err is
NULL, then clip on Overflow, otherwise raise err on
Overflow encountered when trying to fit the result of
nb_index into a Py_ssize_t slot. 

With these three C-API calls, I was able to fix all the
problems that have been identified and simplify several
pieces of code. 





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