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

  Copies up to a maximum of maxchar wide characters from source_str
  into destination_str.

  Syntax:

       #include <wchar.h>

       wchar_t *wcsncpy (wchar_t *destination_str, const wchar_t
       *source_str, size_t maxchar);