Path: utzoo!utgpu!water!watmath!clyde!rutgers!ames!think!husc6!bbn!bbn.com!rsalz
From: rsalz@bbn.com (Rich Salz)
Newsgroups: comp.lang.c
Subject: Re: Dereferencing zero
Message-ID: <292@fig.bbn.com>
Date: 12 Jan 88 17:06:13 GMT
References: <3306@ihlpf.ATT.COM> <7010@brl-smoke.ARPA> <1561@rtech.UUCP> <2953@zeus.TEK.COM>
Followup-To: poster
Organization: BBN Laboratories, Cambridge MA
Lines: 15

>	struct system_vectors	*svp;
>	svp = 0;
>	(svp->whatever_vector)();

Isn't this code guaranteed by ANSI, K&R, H&S, (and Guy Harris :-) to be
illegal?  The minute you assign zero to a pointer you have essentially
delcared that pointer invalid and illegal.  I can understand why you might
need/want to do this in system-specific code, but I don't understand how
it's any more legal than
	strcpy(my_buf, 0) is.

Replies to me and I'll summarize for the net.
	/r$
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