PyLong_AsVoidPtr()/PyLong_FromVoidPtr()

[davidabrahams]

BPO	653542
Nosy	@tim-one, @loewis, @freddrake, @birkenfeld

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2005-12-26.22:59:37.000>
created_at = <Date 2002-12-14.01:02:41.000>
labels = ['docs']
title = 'PyLong_AsVoidPtr()/PyLong_FromVoidPtr()'
updated_at = <Date 2005-12-26.22:59:37.000>
user = 'https://bugs.python.org/davidabrahams'

bugs.python.org fields:

activity = <Date 2005-12-26.22:59:37.000>
actor = 'georg.brandl'
assignee = 'none'
closed = True
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2002-12-14.01:02:41.000>
creator = 'david_abrahams'
dependencies = []
files = []
hgrepos = []
issue_num = 653542
keywords = []
message_count = 7.0
messages = ['13609', '13610', '13611', '13612', '13613', '13614', '13615']
nosy_count = 5.0
nosy_names = ['tim.peters', 'loewis', 'fdrake', 'georg.brandl', 'david_abrahams']
pr_nums = []
priority = 'normal'
resolution = 'works for me'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue653542'
versions = []

[davidabrahams]

These two functions have mutually-recursive definitions
in the docs (which is to say, none).

[loewis]

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user_id=21627

Would you like to provide a patch?

[davidabrahams]

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user_id=52572

Thanks for asking but the problem is that I don't know what
they do!

[loewis]

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user_id=21627

Something very simple:

PyObject *
PyLong_FromVoidPtr(void *p)
{
#if SIZEOF_VOID_P <= SIZEOF_LONG
	return PyInt_FromLong((long)p);
#else

#ifndef HAVE_LONG_LONG
#   error "PyLong_FromVoidPtr: sizeof(void*) > sizeof(long), 
but no long long"
#endif
#if SIZEOF_LONG_LONG < SIZEOF_VOID_P
#   error "PyLong_FromVoidPtr: sizeof(LONG_LONG) < sizeof
(void*)"
#endif
	/* optimize null pointers */
	if (p == NULL)
		return PyInt_FromLong(0);
	return PyLong_FromLongLong((LONG_LONG)p);

#endif /* SIZEOF_VOID_P <= SIZEOF_LONG */
}

[freddrake]

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user_id=3066

Tim, aren't these your babies?

[tim-one]

Logged In: YES
user_id=31435

Nope. Guido checked them in 5 years ago, in rev 1.48. To
judge from the checkin comment, the code may actually have
come from Greg Stein. I don't have time for it, so unassigning.

[birkenfeld]

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user_id=1188172

I think the definitions are pretty clear to understand.
PyLong_FromVoidPtr makes a long from a pointer,
PyLong_AsVoidPtr makes a pointer from a long... closing as
Works for Me.