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Traditional macros, `varargs.h'

   If your C compiler predates ANSI C, you may still be able to use
variable argument lists using the macros from the `varargs.h' header
file.  These macros resemble their ANSI counterparts, but have
important differences in usage.   In particular, since traditional C has
no declaration mechanism for variable argument lists, two additional
macros are provided simply for the purpose of defining functions with
variable argument lists.
   As with `stdarg.h', the type `va_list' is used to hold a data
structure representing a variable argument list.