From: Tobias Zawada <i_inbox@tn-home.de>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 34769@debbugs.gnu.org
Subject: bug#34769: Bug in emacs 26.1 gdb-send match-string applied after non-matching string-match
Date: Wed, 6 Mar 2019 21:10:54 +0100 (CET) [thread overview]
Message-ID: <1047508139.239469.1551903054974@email.ionos.de> (raw)
In-Reply-To: <835zsvdfz4.fsf@gnu.org>
Dear Eli,
thanks for looking into this.
> > It is wrong to call (match-string 3 string) if (string-match gdb-control-commands-regexp string) returned nil.
> ...
> That is true, and a cleanup is a good idea. But please note that the
> undefined results are not used if control-command-p is nil, so the
> issue is not that serious.
The match data is that one of the previous successful matching operation.
One gets an args-out-of-range signal if the indexes in the match data are larger than the width of the string argument to match-string. That is how I discovered the error.
A reconstruction with gdb-send is too involved.
Instead I demonstrate the effect with the following orgmode source code block inclusive results:
#+BEGIN_SRC emacs-lisp
(string-match "\\(1\\) *\\(2\\)" "1 2")
(string-match "\\(3 \\(4\\)\\)" "1 2")
(append
(match-data)
(condition-case err
(match-string 2 "1 2")
(error (list err))))
#+END_SRC
#+RESULTS:
| 0 | 12 | 0 | 1 | 11 | 12 | (args-out-of-range 1 2 11 12) |
Best regards,
Tobias
next prev parent reply other threads:[~2019-03-06 20:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-06 11:27 bug#34769: Bug in emacs 26.1 gdb-send match-string applied after non-matching string-match Tobias Zawada
2019-03-06 18:18 ` Eli Zaretskii
2019-03-06 20:10 ` Tobias Zawada [this message]
2019-03-07 15:18 ` Eli Zaretskii
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