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Initialize variable argument list

     #include <varargs.h>
     va_list AP;
With the `varargs.h' macros, use `va_start' to initialize a data
structure AP to permit manipulating a variable argument list.  AP must
have the type VA_ALIST.
`va_start' does not return a result.
`va_start' is also defined as a macro in ANSI C, but the definitions
are incompatible; the ANSI version has another parameter besides AP.