[libvirt] PATCH: Fix default bus type selection for disks

[Daniel Veillard]

On Tue, May 13, 2008 at 12:54:58PM +0100, Daniel P. Berrange wrote:
> On Tue, May 13, 2008 at 10:31:10AM +0200, Jim Meyering wrote:
> > "Daniel P. Berrange" <berrange at redhat.com> wrote:
> > 
> > in spite of the proliferation of casts --
> > That's not good for readability/maintainability.
> > 
> > What do you think of this?
> > 
> >     static inline char *xml2char(xmlChar *x) { return (char *) x; }
> > 
> > The uses are still ugly, but at least they're safer:
> > (note that the parameter cannot be a "const" pointer because the
> > incoming xmlChar* is almost always non-const, as it must be, since
> > it's going to be freed).
> 
> I'd suggest going one better and defining a thing wrapper around the 
> xmlNodeGetProp method 
> 
>     char *virXMLGetProp(xmlNodePtr *node, const char *name) {
>         return (char *)xmlNodeGetProp(node, BAD_CAST name);
>     }
> 
> That should let us get rid of all these casts throughout the code

  The explanation for the casts is that libxml2 uses xmlChar * to indicate
that the target string is UTF-8, i.e. you can actually know what's inside
without guessing ...

> The only potential issue would be that xmlChar * is technically supposed to
> be free via the xmlFree() method, rather than free(), but I believe they're
> defined to be identical unless special debug allocators are registered ?

  Right,

Daniel

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