GNU bug report logs - #18266
grep -P and invalid exits with error

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From: Vincent Lefevre <vincent <at> vinc17.net>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 18266 <at> debbugs.gnu.org, Santiago <santiago <at> debian.org>, 758105 <at> bugs.debian.org
Subject: bug#18266: Bug#758105: bug#18266: grep -P and invalid exits with error
Date: Thu, 14 Aug 2014 23:03:50 +0200

On 2014-08-14 13:13:45 -0700, Paul Eggert wrote:
> Vincent Lefevre wrote:
> >The problem with this solution is that it would change the length
> >of the text, while replacing invalid bytes by zero bytes could be
> >done in place (if allowed), with very little change of the code,
> >I think.
> 
> True. Though it might be more user-friendly to use '?' as the
> replacement byte.

On output, yes (though in most cases, non-printable characters are
probably seen as garbage and don't really matter); and when the lines
are not printed, this doesn't matter.

On input, using null bytes may be better if one wants to be able to
match real replacement characters without false positives. Matching
null bytes is not common, AFAIK.

-- 
Vincent Lefèvre <vincent <at> vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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