In file _winapi.c

We can see code:

size = PyUnicode_AsWideChar(key, NULL, 0);

Py_ssize_t PyUnicode_AsWideChar(PyObject *unicode, wchar_t *wstr, Py_ssize_t size)

But the doc say "Copies the Unicode Object contents into the wchar_t buffer w. At most size wchar_t characters are copied.".I think we miss the situation when size is 0.

Linked PRs

• gh-113437: Update documentation about PyUnicode_AsWideChar() function #113455
• [3.12] gh-113437: Update documentation about PyUnicode_AsWideChar() function (GH-113455) #115407
• [3.11] gh-113437: Update documentation about PyUnicode_AsWideChar() function (GH-113455) #115408