[issue9989] ctypes bitfield problem

[Ned Deily]

Ned Deily <nad at acm.org> added the comment:

An endian issue? (i.e. on OS X, it works on ppc but not Intel)
A slightly more detailed test case:

$ more test_ctypes.py
import ctypes
class Blah2(ctypes.Structure):
    _fields_ = [("x", ctypes.c_uint64, 64),
                ("y", ctypes.c_uint64)]
val = 0x0123456789ABCDEF
x = Blah2(val, val)
print(Blah2.x)
print(hex(x.x))
print(Blah2.y)
print(hex(x.y))
$ arch -i386 python2.7 test_ctypes.py
<Field type=c_ulonglong, ofs=0:0, bits=64>
0x0L
<Field type=c_ulonglong, ofs=8, size=8>
0x123456789abcdefL
$ arch -x86_64 python2.7 test_ctypes.py
<Field type=c_ulong, ofs=0:0, bits=64>
0x0L
<Field type=c_ulong, ofs=8, size=8>
0x123456789abcdefL
$ arch -ppc python2.7 test_ctypes.py
<Field type=c_ulonglong, ofs=0:0, bits=64>
0x123456789abcdefL
<Field type=c_ulonglong, ofs=8, size=8>
0x123456789abcdefL

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nosy: +ned.deily

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9989>
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