VMS Help CC, Run-time functions, wcsxfrm  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Changes a wide-character string such that the changed string can be
  passed to the wcscmp function and produce the same result as
  passing the unchanged string to the wcscoll function.

  Syntax:

       #include <wchar.h>

       size_t wcsxfrm (wchar_t *ws1, const wchar_t *ws2, size_t
       maxchar);