Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!eecae!tank!mimsy!chris
From: chris@mimsy.UUCP (Chris Torek)
Newsgroups: comp.unix.wizards
Subject: Re: Calling Varargs Twice on a Sun 3 (MC68020)
Message-ID: <16490@mimsy.UUCP>
Date: 22 Mar 89 10:50:48 GMT
References: <1698@spp2.UUCP>
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
Lines: 51

In article <1698@spp2.UUCP> simpson@trwarcadia.uucp writes:
>Can anyone tell me the magic incantation to call varargs twice on a Sun 3/60?

There is no such incantation; what you are trying to do is, in general,
impossible.

>b(va_alist)
>va_dcl
>{
	...
>}
>
>/* a() calls b() */
>a(va_alist)
>va_dcl
>{
	...
>    b(va_alist);

What you need to do instead (which is not only possible, but even
portable) is this:

	b(va_alist)
		va_dcl
	{
		va_list ap;

		va_start(ap);
		vb(ap);
		va_end(ap);
	}

	vb(ap)
		va_list ap;
	{
		...
	}

	a(va_alist)
		va_dcl
	{
		va_lits ap;

		va_start(ap);
		vb(ap);
		...

This is why v*printf() exist.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain:	chris@mimsy.umd.edu	Path:	uunet!mimsy!chris