cpython (original) (raw)

It was previously just: Modules/_ctypes/_ctypes.c:1416, so it used to silently truncate if sizeof(size_t) < sizeof(long). When sizeof(size_t) > sizeof(long), it raised OverflowError when _length_ was too big. With the patch, the behavior when sizeof(size_t) < sizeof(long) is preserved, while when it's bigger, it will use PyLong_AsLongLongAndOverflow which allows to pass larger lengths.

I'm reluctant to add code to handle sizeof(size_t) < sizeof(long). Especially if CPython itself doesn't support such a platform, since it will never be tested. Even more so since it requires to write a custom variation of PyLong_As{Type}AndOverflow to handle the smaller types, and which types should that be...