--- Begin Message ---
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Subject: |
24.0.50; No response from 'occur' (infinite loop when regexp matches empty string?) |
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Date: |
Wed, 08 Dec 2010 13:53:36 -0500 |
This bug manifests in all versions of GNU emacs that I have. The facts:
1) Start with 'emacs -nw -Q'. We see buffer *scratch* containing the
initial greeting ';; This buffer is for notes . . .'.
2) Enter 'M-x occur<RET>'. We're now in the minibuffer with prompt
'List lines matching regexp:'.
3) Enter 'a*<RET>'. Emacs stops responding.
I believe the problem is in function occur-engine (file replace.el),
specifically the section labelled 'Highlight the matches'.
;; Highlight the matches
(let ((len (length curstring))
(start 0))
(while (and (< start len)
(string-match regexp curstring start))
(add-text-properties
(match-beginning 0) (match-end 0)
(append
`(occur-match t)
(when match-face
;; Use `face' rather than `font-lock-face' here
;; so as to override faces copied from the buffer.
`(face ,match-face)))
curstring)
(setq start (match-end 0))))
When the given regexp matches a null string, the final line of code here
does not change variable start, so we loop infinitely.
/Larry Denenberg
address@hidden
http://larry.denenberg.com/
In GNU Emacs 24.0.50.1 (i386-apple-darwin9.8.0, NS apple-appkit-949.54)
of 2010-08-10 on braeburn.aquamacs.org - Aquamacs Distribution 2.1dev
Windowing system distributor `Apple', version 10.3.1038
configured using `configure '--with-ns' '--without-x' 'CFLAGS=-arch i386 -arch
ppc' 'LDFLAGS=-arch i386 -arch ppc''
Important settings:
value of $LC_ALL: nil
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default enable-multibyte-characters: t
Major mode: Info
Minor modes in effect:
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TeX-source-correlate-mode: t
display-time-mode: t
savehist-mode: t
smart-frame-positioning-mode: t
aquamacs-autoface-mode: t
recentf-mode: t
osx-key-mode: t
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delete-selection-mode: t
pc-selection-mode: t
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--- End Message ---
--- Begin Message ---
|
Subject: |
Re: bug#7593: 24.0.50; No response from 'occur' (infinite loop when regexp matches empty string?) |
|
Date: |
Wed, 18 Dec 2013 13:11:32 +0800 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux) |
> 1) Start with 'emacs -nw -Q'. We see buffer *scratch* containing the
> initial greeting ';; This buffer is for notes . . .'.
>
> 2) Enter 'M-x occur<RET>'. We're now in the minibuffer with prompt
> 'List lines matching regexp:'.
>
> 3) Enter 'a*<RET>'. Emacs stops responding.
Fixed, thanks.
--- End Message ---