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bug#9388: 24.0.50; Bug in libxml-parse-xml-region

From: Jason Earl
Subject: bug#9388: 24.0.50; Bug in libxml-parse-xml-region
Date: Sat, 27 Aug 2011 18:00:11 -0600

This bug report will be sent to the Bug-GNU-Emacs mailing list
and the GNU bug tracker at debbugs.gnu.org.  Please check that
the From: line contains a valid email address.  After a delay of up
to one day, you should receive an acknowledgement at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

open a file foo.xml with the following contents (although any valid xml
file will do).

--8<---------------cut here---------------start------------->8---
<?xml version='1.0' encoding='utf-8'?>
--8<---------------cut here---------------end--------------->8---

Then start ielm and test libxml-parse-xml-region with the following bit
of elisp.

--8<---------------cut here---------------start------------->8---
(with-current-buffer "foo.xml"
         (libxml-parse-xml-region (point-min) (point-max)))
--8<---------------cut here---------------end--------------->8---

It will return nil, but it should return "(foo nil)".

This function was broken with bzr commit 105297 to trunk, and I believe
that it can be fixed with the following simple patch (at least it works
for me).

--8<---------------cut here---------------start------------->8---
=== modified file 'src/xml.c'
--- src/xml.c   2011-07-24 14:01:58 +0000
+++ src/xml.c   2011-08-27 22:58:13 +0000
@@ -124,7 +124,7 @@
   if (doc != NULL)
-      xmlNode *n = doc->children->next;
+      xmlNode *n = doc->children;
       Lisp_Object r = Qnil;
       while (n) {

--8<---------------cut here---------------end--------------->8---

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file

In GNU Emacs (x86_64-unknown-linux-gnu, GTK+ Version 2.24.4)
 of 2011-08-27 on jearl-desktop
Windowing system distributor `The X.Org Foundation', version 11.0.11001000
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: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: IELM

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-x C-f f o o <tab> . x <tab> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> f o o . x m l <return> 
C-x 2 C-x o M-x i e l m <tab> <return> ( w i t h <tab> 
c u <tab> SPC " f o o . x m l " <return> ( l i b <tab> 
x <tab> SPC ( p o i n t - m i n ) SPC ( p o i n t - 
m a x ) ) <return> ) <return> M-x e m a c s - r e <tab> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> r e p o <tab> r 
<tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Using vacuous schema
Making completion list...

Load-path shadows:
None found.

(shadow sort gnus-util mail-extr message format-spec rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mailabbrev mail-utils gmm-utils mailheader
emacsbug help-mode view ielm pp comint ring nxml-uchnm rng-xsd
xsd-regexp rng-cmpct regexp-opt rng-nxml rng-valid rng-loc rng-uri
rng-parse nxml-parse rng-match rng-dt rng-util rng-pttrn nxml-ns
easymenu nxml-mode nxml-outln nxml-rap nxml-util nxml-glyph nxml-enc
xmltok time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel
x-win x-dnd tool-bar dnd fontset image fringe lisp-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer loaddefs
button faces cus-face files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process dbusbind dynamic-setting
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multi-tty emacs)

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