Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/ape-stdarg/stdarg.h.4

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Distributed under the MIT License.
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#ifndef __STDARG
#define __STDARG

typedef char *va_list;

#define va_start(list, start) list =\
	(sizeof(start) < 4?\
		(char*)((int*)&(start)+1):\
		(char*)(&(start)+1))
#define va_end(list)
#define va_arg(list, mode)\
	((sizeof(mode) <= 4)?\
		((list += 4), (mode*)list)[-1]:\
	(signof(mode) != signof(double))?\
		((list += sizeof(mode)), (mode*)list)[-1]:\
		((list = (char*)((unsigned long)(list+7) & ~7) + sizeof(mode)), (mode*)list)[-1])

#endif /* __STDARG */

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