Xref: utzoo comp.std.c:876 comp.lang.c:16789
Newsgroups: comp.std.c,comp.lang.c
Path: utzoo!henry
From: henry@utzoo.uucp (Henry Spencer)
Subject: Re: detecting invalid pointers
Message-ID: <1989Mar8.174556.1389@utzoo.uucp>
Organization: U of Toronto Zoology
References: <15495@cup.portal.com>
Date: Wed, 8 Mar 89 17:45:56 GMT

In article <15495@cup.portal.com> Kevin_P_McCarty@cup.portal.com writes:
>Is there any guaranteed way to detect an out of range pointer,
>i.e., one which is supposed to point into an array but might not?

No.  There simply is no way to do this portably, since the results of
pointer comparisons (ignoring NULL for the moment) are well-defined only
within the array.
-- 
The Earth is our mother;       |     Henry Spencer at U of Toronto Zoology
our nine months are up.        | uunet!attcan!utzoo!henry henry@zoo.toronto.edu