GNU bug report logs - #13084
boyer_moore crashes with certain characters in the case table

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Juri Linkov <juri <at> jurta.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#13084: closed (boyer_moore crashes with certain characters in
 the case table)
Date: Wed, 12 Dec 2012 23:11:01 +0000

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Your message dated Thu, 13 Dec 2012 01:05:09 +0200
with message-id <876246swgq.fsf <at> mail.jurta.org>
and subject line Re: bug#13084: boyer_moore crashes with certain characters in the case	table
has caused the debbugs.gnu.org bug report #13084,
regarding boyer_moore crashes with certain characters in the case table
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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13084: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=13084
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From: Juri Linkov <juri <at> jurta.org>
To: bug-gnu-emacs <at> gnu.org
Subject: boyer_moore crashes with certain characters in the case table
Date: Wed, 05 Dec 2012 02:34:39 +0200

The minimal reproducible recipe for crashes in boyer_moore noticed in bug#13041:

1. emacs -Q

2. Eval in *scratch*:

(let ((table (standard-case-table)) canon)
  (setq canon (copy-sequence table))
  (aset canon #xff59 ?y)
  (set-char-table-extra-slot table 1 canon)
  (set-char-table-extra-slot table 2 nil)
  (set-standard-case-table table))

3. Start an activity that includes a search, e.g. `C-x 8 RET TAB'

The crash in boyer_moore is caused by fullwidth characters like #xff59
whose Unicode properties are:

  name: FULLWIDTH LATIN SMALL LETTER Y
  decomposition: (wide 121) (wide 'y')

However, the crash doesn't occur when the same fullwidth characters are
set to their downcase counterparts in lisp/international/characters.el:

  ;; Fullwidth Latin
  (setq c #xff21)
  (while (<= c #xff3a)
    (set-case-syntax-pair c (+ c #x20) tbl)
    (modify-category-entry c ?l)
    (modify-category-entry (+ c #x20) ?l)
    (setq c (1+ c)))

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From: Juri Linkov <juri <at> jurta.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: handa <at> gnu.org, 13084-done <at> debbugs.gnu.org
Subject: Re: bug#13084: boyer_moore crashes with certain characters in the
	case	table
Date: Thu, 13 Dec 2012 01:05:09 +0200

> So what did you mean by "no more obstacles" above?

By obstacles I meant crashes that you fixed.
Thanks for that.  I'm closing this bug.

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