[Python-Dev] Documenting the ssize_t Python C API changes (original) (raw)

"Martin v. Löwis" martin at v.loewis.de
Tue Mar 21 16:11:35 CET 2006

Fredrik Lundh wrote:

I've posted a simple-minded source scanner here:

http://svn.effbot.python-hosting.com/stuff/sandbox/python/ssizecheck.py

Great job! I've added a link to that to the PEP.

There are two improvements you could make:

Some of the functions in the first list return Py_ssize_t; calling them can cause truncation if the result value is larger than INT_MAX (and it is assigned to an int). To find those functions, do grep 'PyAPI_FUNC(Py_ssize_t)' Include/*.h
Usage of the "old" function pointer type name (e.g. intobjargproc) likely also indicates an error, since many of these pointers have changed there types. I believe the only exception for this is inquiry, which still has legit uses, in nb_nonzero, tp_clear, and tp_is_gc.

Regards, Martin