New submission from Devin Jeanpierre:
As far as I can tell, the only safe and correct way to convert a (for example)
intptr_t to a python long is something akin to the following:
size_t repsize = sizeof(intmax_t)*8 + 2;
char i_buf[repsize]; // enough to fit base 2 with sign, let alone base 1
snprintf(i_buf, repsize, "%ij", (intmax_t) myinteger);
return PyLong_FromString(i_buf, NULL, 10);
Does this not seem absurd?
PyLong_FromIntMax_t(myinteger) would be great. Or maybe even better would be
PyLong_FromBytes(&myinteger, sizeof(myinteger)) ?
This is problematic because many things that can interact with the Python C-API
do not use the C types like "long long" or "int". Instead they might use the
equivalents of intptr_t and int32_t, which are more reliably sized.
----------
messages: 188103
nosy: Devin Jeanpierre
priority: normal
severity: normal
status: open
title: Hard to create python longs from arbitrary C integers
versions: Python 3.4
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17870>
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