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

  Returns the number of longwords in the argument list.

  Syntax:

       #include <stdarg.h>

       OR

       #include <varargs.h> (Compaq C Extension)

       void va_count(int *count);