linux-kernel - Re: [PATCH 1/1] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

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Message-ID: <87zhbtkrc5.fsf@intel.com>
Date:   Fri, 03 Apr 2020 09:37:14 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Joe Perches <joe@...ches.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Petr Mladek <pmladek@...e.com>
Cc:     mchehab@...nel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        hverkuil@...all.nl,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        laurent.pinchart@...asonboard.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-media@...r.kernel.org,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>
Subject: Re: [PATCH 1/1] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

On Thu, 02 Apr 2020, Joe Perches <joe@...ches.com> wrote:
> On Thu, 2020-04-02 at 11:34 +0300, Jani Nikula wrote:
>> Or could we conceive of a way to make this locally extensible yet safe,
>> letting callers use something like %{foo}, as well as providing a
>> locally relevant function to do the conversion?
>
> No.  printf validation would be broken.

I tossed the idea on a whim, and thinking further I could probably come
up with a number of challenges, but care to elaborate on what you see as
the problem in validation?

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Graphics Center