GNU bug report logs - #41094
28.0.50; `xml-print' produces invalid XML

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Philipp <p.stephani2 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; `xml-print' produces invalid XML
Date: Tue, 05 May 2020 14:31:36 +0200

For example:

emacs -Q -batch -l xml -eval '(with-temp-buffer (xml-print (quote ((foo nil "\0")))) (write-region nil nil "/tmp/test.xml"))' && xmllint /tmp/test.xml
/tmp/test.xml:1: parser error : Premature end of data in tag foo line 1
<foo>
     ^

`xml-print' here generates a NUL character, which is invalid in XML
(cf. https://www.w3.org/TR/xml/#charsets).  Probably `xml-escape-string'
should error out when encountering any invalid character (including
non-Unicode characters).


In GNU Emacs 28.0.50 (build 44, x86_64-apple-darwin19.3.0, NS appkit-1894.30 Version 10.15.3 (Build 19D76))
 of 2020-04-12
Repository revision: 900947fbe8b202ce2ae15e87ef377ca27da73ec9
Repository branch: master
Windowing system distributor 'Apple', version 10.3.1894
System Description:  Mac OS X 10.15.4

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --with-modules --without-xml2 --without-pop --with-mailutils
 --enable-gcc-warnings=warn-only --enable-checking=all
 --enable-check-lisp-object-type 'CFLAGS=-ggdb3 -O0''

Configured features:
NOTIFY KQUEUE ACL GNUTLS ZLIB TOOLKIT_SCROLL_BARS NS MODULES THREADS
JSON PDUMPER LCMS2 GMP

Important settings:
  value of $LANG: de_DE.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-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

Load-path shadows:
None found.

Features:
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rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils phst skeleton
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password-cache json map url-vars mailcap subr-x rx gnutls puny seq
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Memory information:
((conses 16 63759 4957)
 (symbols 48 8146 0)
 (strings 32 22012 1765)
 (string-bytes 1 705507)
 (vectors 16 13330)
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Message #12 received at 41094-done <at> debbugs.gnu.org (full text, mbox):

From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: 41094-done <at> debbugs.gnu.org
Subject: Re: bug#41094: 28.0.50; `xml-print' produces invalid XML
Date: Sat, 23 May 2020 14:03:39 +0200

Am Di., 5. Mai 2020 um 14:32 Uhr schrieb Philipp <p.stephani2 <at> gmail.com>:
>
>
> For example:
>
> emacs -Q -batch -l xml -eval '(with-temp-buffer (xml-print (quote ((foo nil "\0")))) (write-region nil nil "/tmp/test.xml"))' && xmllint /tmp/test.xml
> /tmp/test.xml:1: parser error : Premature end of data in tag foo line 1
> <foo>
>      ^
>
> `xml-print' here generates a NUL character, which is invalid in XML
> (cf. https://www.w3.org/TR/xml/#charsets).  Probably `xml-escape-string'
> should error out when encountering any invalid character (including
> non-Unicode characters).

Fixed with commit f8581bcf6a.

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