Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!ucsd!rutgers!bellcore!tness7!tness1!sugar!ficc!peter
From: peter@ficc.uu.net (Peter da Silva)
Newsgroups: comp.lang.c
Subject: Re: "Numerical Recipes in C" is nonportable code
Message-ID: <1429@ficc.uu.net>
Date: 8 Sep 88 01:52:09 GMT
References: <664@lindy.Stanford.EDU> <6758@megaron.arizona.edu> <718@gtx.com> <640@drilex.UUCP>
Organization: SCADA
Lines: 20

In article <640@drilex.UUCP>, dricej@drilex.UUCP (Craig Jackson) writes:
> * Note that putting the protection in the compiler was also an idea
> of Per Brinch-Hansen's in the 1970s, with Concurrent Pascal.  Burroughs
> had been doing it for many years, even then.

What's to stop you from doing the following:

	Generate code in an array.
	Jump to the beginning of the array. *

Now you've blown the protection. You can do anything. I hope this isn't a
multiuser machine...

* this may involve such things as passing a pointer to an array to a
function that's declared that argument as a pointer to a function, or
even by writing the array out as a file and executing it... I can't see
how you could write a valid 'C' compiler that wouldn't let you violate
this protection.
-- 
Peter da Silva  `-_-'  Ferranti International Controls Corporation.
"Have you hugged  U  your wolf today?"            peter@ficc.uu.net