Re: [PATCH] docs: document handling of metacharacter escape in xl disk format

[Ian Campbell <ian.campbell@citrix.com>]

On Thu, 2016-02-18 at 15:44 -0700, Jim Fehlig wrote:
> Ian Campbell wrote:
> > Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
> > Cc: Jim Fehlig <jfehlig@suse.com>
> > ---
> >  docs/misc/xl-disk-configuration.txt | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> > 
> > diff --git a/docs/misc/xl-disk-configuration.txt b/docs/misc/xl-disk-
> > configuration.txt
> > index 6a2118d..a03ad10 100644
> > --- a/docs/misc/xl-disk-configuration.txt
> > +++ b/docs/misc/xl-disk-configuration.txt
> > @@ -48,6 +48,24 @@ positionally or explicitly).
> >  
> >  Whitespace may appear before each parameter and will be ignored.
> >  
> > +Metacharacters in a <diskspec> may be escaped using a backslash:
> > +
> > +    Escape      HEX     Description
> > +    ------      ---     -----------
> > +    \a          0x07    Bell
> > +    \b          0x08    Backspace
> > +    \t          0x09    Horizontal Tab
> > +    \n          0x0A    New Line / Line Feed
> > +    \f          0x0C    Form Feed
> > +    \r          0x0D    Carriage Return
> > +    \v          0x0B    Vertical Tab
> > +    \"          0x22    A literal double quote
> > +    \'          0x27    A literal single quote
> > +    \\          0x5C    A literal backslash
> > +    \xXX                Character XX in hexadecimal
> > +    \OOO                Character OOO in octal
> 
> Do you know how any of these would be useful in a diskspec? I guess I'm
> struggling to understand when a 'Bell' would be needed :-).

I've not got a clue -- these are just all the ones handled by
xlu__cfgl_dequote, perhaps just for completeness?

This is applied to all strings in a cfg file, not just diskspecs, but I
can't think of anything there where Bell would be useful either.

Ian.
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