New issue 3095: PyUnicode_AsUCS4Copy fails with extended Unicode characters on
Windows
https://bitbucket.org/pypy/pypy/issues/3095/pyunicode_asucs4copy-fails-with-extended
Ondrej B:
The following test case works on CPython 3.7 but fails on PyPy3.6-7.2.0 when
running on Windows:
`ucs4_test.c`:
```c
#include "Python.h"
static PyObject*
test(PyObject* self, PyObject* args)
{
PyObject* py_string;
if (!PyArg_ParseTuple(args, "O", &py_string))
return NULL;
Py_UCS4 *text = PyUnicode_AsUCS4Copy(py_string);
return PyLong_FromLong(*text);
}
// define module called ucs4_test ...
```
`test.py`:
```python
import ucs4_test
def test(ch):
assert ucs4_test.test(ch) == ord(ch)
test("\U0001F12B")
```
I believe the issue is caused here:
[https://bitbucket.org/pypy/pypy/commits/3ec1002a818c#Lpypy/module/cpyext/unicodeobject.pyT1088](https://bitbucket.org/pypy/pypy/commits/3ec1002a818c#Lpypy/module/cpyext/unicodeobject.pyT1088)
The type returned by `PyUnicode_AsUnicode` seems to be `wchar_t`, which is
actually UCS2 on Windows \(and a few other platforms\).
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