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

  Returns the address of the last occurrence of a given wide
  character in a null-terminated, wide-character string.  The
  terminating null character is considered to be part of the string.

  Syntax:

       #include <wchar.h>

       wchar_t *wcsrchr (const wchar_t *wstr, wchar_t wc);