#include <varargs.h> va_list ap; va_start(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
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