eryksun added the comment:

When sizeof(c_wchar) == 2, it can just count the number of non-BMP ordinals in 
the string. Another approach would be to use size = 
pythonapi.PyUnicode_AsWideChar(init, None, 0), but then the whole function may 
as well be implemented in the _ctypes extension module.

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nosy: +eryksun

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<http://bugs.python.org/issue19865>
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