GNU bug report logs - #8545
issues with recent doprnt-related changes

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Package: emacs;

Reported by: Paul Eggert <eggert <at> cs.ucla.edu>

Date: Mon, 25 Apr 2011 05:48:01 UTC

Severity: normal

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: rms <at> gnu.org
Cc: lekktu <at> gmail.com, 8545 <at> debbugs.gnu.org
Subject: bug#8545: issues with recent doprnt-related changes
Date: Sun, 01 May 2011 17:23:37 -0700

On 05/01/11 16:59, Richard Stallman wrote:
> This would break many constructions intended to test whether an
> operation did overflow.  Is there any reliable way to test for that?

Yes.  For example:

   int
   add_overflow (int a, int b)
   {
     if (b < 0)
       return a < INT_MIN - b;
     else
       return INT_MAX - b < a;
   }

add_overflow (a, b) returns 1 if a + b would overflow.
There are similar reliable tests for the other arithmetic operations.
This bug report was last modified 4 years and 251 days ago.

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