bug#2416: 23.0.60; decode-coding-region

[Eli Zaretskii <eliz@gnu.org>]

> Date: Fri, 20 Feb 2009 13:13:01 -0800 (PST)
> From: mj <mj54590@gmail.com>
> Cc: 
> 
> I have been having this problem since I switched to Emacs 23 several
> weeks ago. I'm using VM to read my mails. There seems to be a problem
> in decode-coding-region when VM tries to decode a string. When VM
> tries to decode a region or a string, it uses a temporary buffer and
> basically runs the following lisp code:
> 
> (apply 'decode-coding-region (point-min) (point-max)  'us-ascii nil)
> 
> The original buffer  content would be something like this:
> 
> B7040400-12
> some text here
> 
> after decode-coding-region is executed, the buffer content became:
> 
> ^@7040450-12
> some text here
> 
> Where ^@ is actually binary code \0 (not ascii ^ and @). There is another instance
> that a string was decoded and the result is  ^@ prefixed. 
> 
> I could not reproduce this with "Emacs -Q". But it always happens when
> thsoe particular messages were processed by VM. 

Could you please see if the problem still persists in the current CVS?
Your Emacs seems to be about a month old (Jan 29), and a couple of
related bugs were fixed in coding.c since then.