GNU bug report logs - #1301
previous-single-char-property-change on string with no match returns string end

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Tim Toolan" <toolan <at> ele.uri.edu>
To: bug-gnu-emacs <at> gnu.org
Subject: previous-single-char-property-change on string with no match returns string end
Date: Mon,  3 Nov 2008 08:38:00 -0500

When searching a string using previous-single-char-property-change, and no
change is found, it returns the maximum valid position in object, instead
of the minimum valid position in object as stated in the emacs lisp manual.

This can be reproduced by the following lisp statement, which returns 10
instead of 0.

(previous-single-char-property-change 10 'display "0123456789")


In GNU Emacs 22.2.1 (x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2008-06-12 on aquarius
Windowing system distributor `The X.Org Foundation', version 11.0.10300000
configured using `configure  '--prefix=/usr' '--host=x86_64-pc-linux-gnu' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc' '--localstatedir=/var/lib' '--program-suffix=-emacs-22' '--infodir=/usr/share/info/emacs-22' '--without-carbon' '--with-sound' '--with-x' '--with-toolkit-scroll-bars' '--with-jpeg' '--with-tiff' '--with-gif' '--with-png' '--with-xpm' '--with-x-toolkit=athena' '--without-gtk' '--without-hesiod' '--with-kerberos' '--with-kerberos5' '--libdir=/usr/lib64' '--build=x86_64-pc-linux-gnu' 'build_alias=x86_64-pc-linux-gnu' 'host_alias=x86_64-pc-linux-gnu' 'CFLAGS=-march=nocona -pipe -O2' 'LDFLAGS=''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: C
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
  show-paren-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x r e p o r t <tab> <return>

Recent messages:
Warning: no fonts matching `-*-fixed-medium-r-normal-*-16-*-*-*-*-*-iso8859-1' available [2 times]
("emacs" "pscpc.el")
Loading paren...done
Loading /usr/share/emacs/site-lisp/auctex/tex-site.el (source)...done
Loading /u/staff/toolan/.emacs.d/auxlabel.el (source)...done
Loading /u/staff/toolan/.emacs.d/auxlabel.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Loading emacsbug...
Loading regexp-opt...done
Loading emacsbug...done

Message #10 received at 1301-done <at> emacsbugs.donarmstrong.com (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: 1301-done <at> debbugs.gnu.org
Cc: Tim Toolan <toolan <at> ele.uri.edu>
Subject: Re: bug#1301: previous-single-char-property-change on string with
 no	match returns string end
Date: Mon, 03 Nov 2008 18:35:17 +0100

> When searching a string using previous-single-char-property-change, and no
> change is found, it returns the maximum valid position in object, instead
> of the minimum valid position in object as stated in the emacs lisp manual.
>
> This can be reproduced by the following lisp statement, which returns 10
> instead of 0.
>
> (previous-single-char-property-change 10 'display "0123456789")
>
>
> In GNU Emacs 22.2.1 (x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
>  of 2008-06-12 on aquarius

Thank you very much for the report.

Fixed for Emacs 23.0.60 as

2008-11-03  Martin Rudalics  <rudalics <at> gmx.at>

	* textprop.c (Fprevious_single_char_property_change): Return 0
	when there's no change in a string.  (Bug#1301)

martin

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