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Re: Integer overflow in wcswidth

From: Florian Weimer <fweimer at redhat dot com>
To: Andreas Schwab <schwab at suse dot de>
Cc: GNU C Library <libc-alpha at sourceware dot org>
Date: Mon, 19 Sep 2016 17:26:52 +0200
Subject: Re: Integer overflow in wcswidth
Authentication-results: sourceware.org; auth=none
References: <5d5a792f-444c-43ad-e89f-3d93eea6741d@redhat.com> <mvmeg4g85dv.fsf@hawking.suse.de>

On 09/19/2016 02:02 PM, Andreas Schwab wrote:

On Sep 19 2016, Florian Weimer <fweimer@redhat.com> wrote:

But in the end, this interface is just broken (we can't even report and
EOVERFLOW error).


POSIX leaves us the backdoor of returning -1 though.


-1 does not seem to be a generic error result to me.

We could also return INT_MAX.  But that's equally wrong.

Florian

References:
- Integer overflow in wcswidth
  - From: Florian Weimer
- Re: Integer overflow in wcswidth
  - From: Andreas Schwab

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