[Python-Dev] Convert int() to size_t in Python/C (original) (raw)

Marcos Dione mdione at grulic.org.ar
Fri Apr 29 10:45:04 EDT 2016 

First of all, I'm not subbscribed to the list (too much traffic for

me), so please CC: me in any answers if possible.

I'm trying to add a new syscall to the os module:

https://bugs.python.org/issue26826

One of the few missing parts is to cenvert a parameter, which would

be a Python int object using PyArg_ParseTupleAndKeywords() to a size_t variable. For something similar, the 'n' format exists, but that one converts to Py_ssize_t (which is ssize_t, really), but that one is signed.

One possible solution hat was suggested to me in the #python IRC

channel was to use that, then test if the resulting value is negative, and adjust accordingly, but I wonder if there is a cleaner, more general solution (for instance, what if the type was something else, like loff_t, although for that one in particular there is a convertion function/macro).

-- (Not so) Random fortune: Premature optimization is the root of all evil. -- Donald Knuth

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