#include <STDDEF.H>

`offsetof`

offsetof (TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)

Offset of member MEMBER in a struct of type TYPE.

`TYPE`
`MEMBER`

Typedef `wchar_t`

typedef unsigned short int wchar_t;

There seems to be a lot of nonsense about _need_wchar_t etc., but for STDLIB we have cut the Gordian knot and done the simple thing.

typedef long ptrdiff_t;

typedef unsigned int size_t;