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Date: Wed, 26 May 2010 16:34:28 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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Subject: Re: Reading /proc/registry/... returns extra char
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On May 26 17:42, Andrey Repin wrote:
> Greetings, Corinna Vinschen!
> 
> >> > $ cat >a.dat
> >> > /proc/registry/HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/Syst
> >> > emBootDevice
> 
> > This trailing NUL character was always there, already with Cygwin 1.5.
> > It's part of the file content.  If strings are stored with a trailing
> > NUL in a file, you don't want Cygwin to remove it for you, right?
> 
> Wrong. The training NULL is a string value terminator for REG_SZ variables,
> also a string separator for REG_MULTI_SZ ones. (Which ends with a spare NULL)
> It must not be exposed to the user.

I disagree.  When you're using tools like regtool, you're right.  But
when accessing the registry as *files* via the virtual /proc filesystem,
you want the file content.  And the file contains the trailing NUL in
REG_SZ and REG_EXPAND_SZ values, and multiple NULs in REG_MULTI_SZ values.
What do you suppose Cygwin should do with the NULs in REG_MULTI_SZ values?
Just remove them?

> BTW, get it as a bugreport - reading REG_MULTI_SZ from /proc/registry returns
> only first string.

Yep, that's a bug.  I'll look into it.


Thanks for the report,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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