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Message-ID: <FABE2D10-EF65-442B-BB46-4D636C7BC28F@trust-in-soft.com>
Date: Sun, 23 Sep 2018 03:44:46 +0000
From: Pascal Cuoq <cuoq@...st-in-soft.com>
To: "musl@...ts.openwall.com" <musl@...ts.openwall.com>
Subject: Re: un-UBify-strings
> On 23 Sep 2018, at 05:15, Rich Felker <dalias@...c.org> wrote:
>
> dist(s,d)==n is a no-overlap case.
In this case the formula I proposed has the drawback of rejecting the case where (uintptr_t)s-(uintptr_t)d is exactly -n. This case may be the justification for the way the original comparison was expressed:
> (uintptr_t)s-(uintptr_t)d-n <= -2*n
(uintptr_t)s-(uintptr_t)d = -n ==> comparison true by LHS and RHS being equal
(uintptr_t)s-(uintptr_t)d = n ==> comparison true by LHS being zero
(uintptr_t)s-(uintptr_t)d > -n and (uintptr_t)s-(uintptr_t)d < n ==> comparison false
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