GNU bug report logs - #15381
24.3; NTEmacs write-region behaviour with MUSTBENEW set to 'excl

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#15381: closed (24.3; NTEmacs write-region behaviour with
 MUSTBENEW set to 'excl)
Date: Sun, 15 Sep 2013 09:48:02 +0000

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Your message dated Sun, 15 Sep 2013 12:46:32 +0300
with message-id <83eh8qqux3.fsf <at> gnu.org>
and subject line Re: bug#15381: 24.3; NTEmacs write-region behaviour with MUSTBENEW set to 'excl
has caused the debbugs.gnu.org bug report #15381,
regarding 24.3; NTEmacs write-region behaviour with MUSTBENEW set to 'excl
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
15381: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=15381
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From: Phil Sainty <psainty <at> orcon.net.nz>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; NTEmacs write-region behaviour with MUSTBENEW set to 'excl
Date: Sun, 15 Sep 2013 20:21:37 +1200

I'm using write-region with the MUSTBENEW argument set to 'excl
to prohibit writing to an existing file. This works as advertised
on Ubuntu, but I happened to try the code under Windows and found
that the write was not prevented.

I further observed that, in this circumstance, the written
content only overwrites the start of the target file (leaving
the remainder), rather than replacing the whole file. This
appears to be the same behaviour as setting the APPEND argument
to zero.

Setting MUSTBENEW to t works as expected.

I'm using the following to test:

M-: (write-region (region-beginning) (region-end) "~/somefile" nil nil 
nil 'excl) RET





In GNU Emacs 24.3.1 (i386-mingw-nt5.1.2600)
 of 2013-03-18 on MARVIN
Windowing system distributor `Microsoft Corp.', version 5.1.2600
Configured using:
 `configure --with-gcc (4.7) --cflags
 -ID:/devel/emacs/libs/libXpm-3.5.8/include
 -ID:/devel/emacs/libs/libXpm-3.5.8/src
 -ID:/devel/emacs/libs/libpng-dev_1.4.3-1/include
 -ID:/devel/emacs/libs/zlib-dev_1.2.5-2/include
 -ID:/devel/emacs/libs/giflib-4.1.4-1/include
 -ID:/devel/emacs/libs/jpeg-6b-4/include
 -ID:/devel/emacs/libs/tiff-3.8.2-1/include
 -ID:/devel/emacs/libs/gnutls-3.0.9/include
 -ID:/devel/emacs/libs/libiconv-1.13.1-1-dev/include
 -ID:/devel/emacs/libs/libxml2-2.7.8/include/libxml2'

Important settings:
  value of $LANG: ENZ
  locale-coding-system: cp1252
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

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:
<help-echo> M-x r e p o r t <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
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[Message part 3 (message/rfc822, inline)]

From: Eli Zaretskii <eliz <at> gnu.org>
To: Phil Sainty <psainty <at> orcon.net.nz>
Cc: 15381-done <at> debbugs.gnu.org
Subject: Re: bug#15381: 24.3;
 NTEmacs write-region behaviour with MUSTBENEW set to 'excl
Date: Sun, 15 Sep 2013 12:46:32 +0300

> Date: Sun, 15 Sep 2013 20:21:37 +1200
> From: Phil Sainty <psainty <at> orcon.net.nz>
> 
> I'm using write-region with the MUSTBENEW argument set to 'excl
> to prohibit writing to an existing file. This works as advertised
> on Ubuntu, but I happened to try the code under Windows and found
> that the write was not prevented.
> 
> I further observed that, in this circumstance, the written
> content only overwrites the start of the target file (leaving
> the remainder), rather than replacing the whole file. This
> appears to be the same behaviour as setting the APPEND argument
> to zero.
> 
> Setting MUSTBENEW to t works as expected.
> 
> I'm using the following to test:
> 
> M-: (write-region (region-beginning) (region-end) "~/somefile" nil nil 
> nil 'excl) RET

This is a known problem on Windows in all versions of Emacs released
until now.  The problem is already fixed in the development code.

If you can build your own Emacs, I can show you the change that is
required to fix the bug.

Thanks.

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