2.9BSD/usr/include/varargs.h

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typedef	char	*va_list;

#define	va_dcl			int va_alist;
#define	va_start(list)		(list) = (char *) &va_alist
#define	va_end(list)
#define	va_arg(list,mode)	((mode *)((list) += sizeof(mode)))[-1]