/sys$common/syshlp/helplib.hlb CC, Run-time functions, strrchr  *Conan The Librarian (sorry for the slow response - running on an old VAX)

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

  Syntax:

       #include <string.h>

       char *strrchr(const char *string, int character);