libc.info: va_arg-trad

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Extract a value from argument list

   *Synopsis*
     #include <varargs.h>
     TYPE va_arg(va_list AP, TYPE);
   *Description*
`va_arg' returns the next unprocessed value from a variable argument
list AP (which you must previously create with VA_START).  Specify the
type for the value as the second parameter to the macro, TYPE.
   *Returns*
`va_arg' returns the next argument, an object of type TYPE.
   *Portability*
The `va_arg' defined in `varargs.h' has the same syntax and usage as
the ANSI C version from `stdarg.h'.