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From: micah@flobb4.csd.sgi.com (Micah Altman)
Newsgroups: comp.sys.sgi
Subject: Re: varargs and -prototype
Keywords: varargs, ANSI, prototype
Message-ID: <1991May10.172449.26884@odin.corp.sgi.com>
Date: 10 May 91 17:24:49 GMT
References: <srp.673809276@babar.mmwb.ucsf.edu>
Sender: news@odin.corp.sgi.com (Net News)
Organization: Silicon Graphics, Inc.  Mountain View, CA
Lines: 32

In <srp.673809276@babar.mmwb.ucsf.edu> srp@babar.mmwb.ucsf.edu (Scott R. Presnell) writes:

>	I am working on a program that uses varargs.  At the same time, but
>for other reasons, I would like to use the IRIX -prototypes argument to
>cc(1).  Is there a "correct" way to specify a prototype for a function that
>uses varargs (and have it work with -prototypes)?  So far, I am having

For variable argument length argument lists in ANSI, you should be 
using the stdarg package, not the varargs package. The prototype form for a 
variable length list is to use an ellipsis "..." after the first argument:

	type function-name(first_arg_type,...)

 
The first argument type is mandatory, I think.

So for example, the declaration for printf would be:
	
	int printf(char* fmt,...);

For more information, check the man page on stdarg(5) and look in the
Ansi C version of the Kernighan and Ritchie book, "The C Programming
Language"




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	Micah Altman, "Computational Juggler"	   	   micah@csd.sgi.com
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