VMS Help CC, Language topics, Builtin Functions, Move Character 3 Operand  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The _MOVC3 function copies a block of memory.  It is the preferred
  way to copy a block of memory to a new location.

  Syntax:

       void _MOVC3(unsigned short __length, const char *__src, char
                   *__dest, ...);

  where the ... is one or two optional arguments:

   o  char **endscr

   o  char **enddest