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Bugs item #1281408, was opened at 2005-09-04 00:12
Message generated for change (Comment added) made by birkenfeld
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1281408&group_id=5470

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Category: Python Interpreter Core
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Adal Chiriliuc (adalx)
>Assigned to: Martin v. Löwis (loewis)
Summary: Py_BuildValue k format units don't work with big values

Initial Comment:
Python 2.4 on Windows XP SP2

Consider this code:

unsigned long x = 0xaabbccdd;
PyObject* v = Py_BuildValue("k", x);
unsigned long y = PyLong_AsUnsignedLong(v);

y will be equal with -1 because PyLong_AsUnsignedLong
will raise an OverflowError since Py_BuildValue doesn't
create a long for the "k" format unit, but an int which
will be interpreted as a negative number.

The K format seems to have the same error,
PyLong_FromLongLong is used instead of
PyLong_FromUnsignedLongLong.

The do_mkvalue function from mod_support.c must be
fixed to use PyLong_FromUnsignedLong instead of
PyInt_FromLong for "k".

Also, the BHLkK format units for Py_BuildValue should
be documented. In my Python 2.4 manual they do not appear.

----------------------------------------------------------------------

>Comment By: Reinhold Birkenfeld (birkenfeld)
Date: 2005-09-14 22:02

Message:
Logged In: YES
user_id=1188172

I think you're right. Do you too, Martin?

----------------------------------------------------------------------

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Bugs item #1281408, was opened at 2005-09-04 00:12
Message generated for change (Comment added) made by loewis
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1281408&group_id=5470

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: Python Interpreter Core
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Adal Chiriliuc (adalx)
>Assigned to: Nobody/Anonymous (nobody)
Summary: Py_BuildValue k format units don't work with big values

Initial Comment:
Python 2.4 on Windows XP SP2

Consider this code:

unsigned long x = 0xaabbccdd;
PyObject* v = Py_BuildValue("k", x);
unsigned long y = PyLong_AsUnsignedLong(v);

y will be equal with -1 because PyLong_AsUnsignedLong
will raise an OverflowError since Py_BuildValue doesn't
create a long for the "k" format unit, but an int which
will be interpreted as a negative number.

The K format seems to have the same error,
PyLong_FromLongLong is used instead of
PyLong_FromUnsignedLongLong.

The do_mkvalue function from mod_support.c must be
fixed to use PyLong_FromUnsignedLong instead of
PyInt_FromLong for "k".

Also, the BHLkK format units for Py_BuildValue should
be documented. In my Python 2.4 manual they do not appear.

----------------------------------------------------------------------

>Comment By: Martin v. Löwis (loewis)
Date: 2005-09-18 10:59

Message:
Logged In: YES
user_id=21627

I'm not sure what it should do: the other option would be to
create an int if it fits, else a long. For 2.4.x atleast,
this would give better backwards compatibility given the
status quo.

I certainly agree that the documentation should be updated.
Patches are welcome.

----------------------------------------------------------------------

Comment By: Reinhold Birkenfeld (birkenfeld)
Date: 2005-09-14 22:02

Message:
Logged In: YES
user_id=1188172

I think you're right. Do you too, Martin?

----------------------------------------------------------------------

You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1281408&group_id=5470
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Bugs item #1281408, was opened at 2005-09-04 00:12
Message generated for change (Comment added) made by birkenfeld
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1281408&group_id=5470

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: Python Interpreter Core
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Adal Chiriliuc (adalx)
>Assigned to: Martin v. Löwis (loewis)
Summary: Py_BuildValue k format units don't work with big values

Initial Comment:
Python 2.4 on Windows XP SP2

Consider this code:

unsigned long x = 0xaabbccdd;
PyObject* v = Py_BuildValue("k", x);
unsigned long y = PyLong_AsUnsignedLong(v);

y will be equal with -1 because PyLong_AsUnsignedLong
will raise an OverflowError since Py_BuildValue doesn't
create a long for the "k" format unit, but an int which
will be interpreted as a negative number.

The K format seems to have the same error,
PyLong_FromLongLong is used instead of
PyLong_FromUnsignedLongLong.

The do_mkvalue function from mod_support.c must be
fixed to use PyLong_FromUnsignedLong instead of
PyInt_FromLong for "k".

Also, the BHLkK format units for Py_BuildValue should
be documented. In my Python 2.4 manual they do not appear.

----------------------------------------------------------------------

>Comment By: Reinhold Birkenfeld (birkenfeld)
Date: 2005-09-18 12:07

Message:
Logged In: YES
user_id=1188172

Attaching patch (including doc changes). For I and k, it
creates an int if it fits, else a long.

----------------------------------------------------------------------

Comment By: Martin v. Löwis (loewis)
Date: 2005-09-18 10:59

Message:
Logged In: YES
user_id=21627

I'm not sure what it should do: the other option would be to
create an int if it fits, else a long. For 2.4.x atleast,
this would give better backwards compatibility given the
status quo.

I certainly agree that the documentation should be updated.
Patches are welcome.

----------------------------------------------------------------------

Comment By: Reinhold Birkenfeld (birkenfeld)
Date: 2005-09-14 22:02

Message:
Logged In: YES
user_id=1188172

I think you're right. Do you too, Martin?

----------------------------------------------------------------------

You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1281408&group_id=5470
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