[issue8670] c_types.c_wchar should not assume that sizeof(wchar_t) == sizeof(Py_UNICODE)

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Patch version 3:
 - fix unicode_aswidechar if Py_UNICODE_SIZE == SIZEOF_WCHAR_T and w == NULL (return the number of characters, don't write into w!)
 - improve unicode_aswidechar() comment

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Added file: http://bugs.python.org/file19083/aswidechar_nonbmp-3.patch

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