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

On Thu, 02 Apr 2020, Joe Perches joe@perches.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.