Re: [Xen-devel] [PATCH 01 of 18] tools/blktap: fix access errors in convert_dev_name_to_num

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2012-04-02 at 15:44 +0100, Olaf Hering wrote:
> On Mon, Apr 02, Ian Jackson wrote:
> 
> > Olaf Hering writes ("[Xen-devel] [PATCH 01 of 18] tools/blktap: fix access 
> > errors in convert_dev_name_to_num"):
> > > xs_api.c: In function 'convert_dev_name_to_num':
> > ...
> > > ptr should be increased in each iteration, not the char it points to.
> > 
> > These changes from `*p++;' to `p++' are correct.  But the description
> > is wrong.  `*p++' is the same as `*(p++)' ie it increments p and then
> > uselessly dereferences it.
> > 
> > > - char *p_sd = "/dev/sd";
> > > - char *p_hd = "/dev/hd";
> > > - char *p_xvd = "/dev/xvd";
> > > - char *p_plx = "plx";
> > > - char *alpha = "abcdefghijklmnop";
> > > + static const char p_sd[] = "/dev/sd";
> > > + static const char p_hd[] = "/dev/hd";
> > > + static const char p_xvd[] = "/dev/xvd";
> > > + static const char p_plx[] = "plx";
> > > + static const char alpha[] = "abcdefghijklmnop";
> > 
> > And this hunk seems entirely unexplained.  Is it supposed to be a
> > const-correctness fix ?  Stylistic improvement ?
> 
> I think that part is not strictly needed.

Adding the const seems reasonable enough. Not sure what the static buys
you on top of that.

Ian.



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