From owner-freebsd-hackers  Fri Mar 30  7:37:12 2001
Delivered-To: freebsd-hackers@freebsd.org
Received: from umbar.vaxpower.org (isildur.icubed.com [208.0.146.176])
	by hub.freebsd.org (Postfix) with SMTP id 1418337B71F
	for <freebsd-hackers@FreeBSD.ORG>; Fri, 30 Mar 2001 07:37:08 -0800 (PST)
	(envelope-from mrfusion@umbar.vaxpower.org)
Received: by umbar.vaxpower.org (5.65/DEC-Ultrix/4.3)
	id AA23527; Fri, 30 Mar 2001 10:37:29 -0500
Date: Fri, 30 Mar 2001 10:37:28 -0500 (EST)
From: Lord Isildur <mrfusion@umbar.vaxpower.org>
Subject: Re: Question regarding the array of size 0.
To: John Franklin <franklin@elfie.org>
Cc: tech-kern@netbsd.org, freebsd-hackers@FreeBSD.ORG
In-Reply-To: <20010330101929.B24999@elfie.org>
Message-Id: <Pine.3.89.10103301045.B22782-0100000@umbar>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

sine one knows the size of the struct, who need the pointer? just 
take the displacement. 

char* buf; /* some buffer */
struct foo{
int header;
struct funkystruct blah;
};

(struct foo*)buf; /*your headers are here */
(struct foo*)buf+1; /* and your data is here */


Isildur

On Fri, 30 Mar 2001, John Franklin wrote:
> 
> You can then read in a block of memory from a file or socket, cast the
> buffer to that data type and have the header and data all accessable 
> via the same structure while leaving the sizeof(struct foo) equal
> to the header's size.
> 
> jf
> -- 
> John Franklin
> franklin@elfie.org
> ICBM: N37 12'54", W80 27'14" Z+2100'
> 

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message