Path: utzoo!attcan!uunet!lll-winken!ames!mailrus!husc6!cmcl2!adm!smoke!gwyn
From: gwyn@smoke.BRL.MIL (Doug Gwyn )
Newsgroups: comp.lang.c
Subject: Re: passing variable numbers of arguments
Message-ID: <9308@smoke.BRL.MIL>
Date: 7 Jan 89 10:16:02 GMT
References: <899@thor.stolaf.edu>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 15

In article <899@thor.stolaf.edu> edf@rocky2.rockefeller.edu writes:
>The following program produces unexpected results:
>foo (va_alist)
>  va_dcl
>{
>  bar (va_alist);
>}

No wonder!  The only proper way to pass a variable argument list
down another level is to pass an initialized va_list object.
The bar() function cannot be called both with variable arguments
AND with a single va_list argument.

Check out the specs for vfprintf() and friends to see how this
approach works.