# Re: \[PATCH v6 1/3\] lib/vsprintf: Add support for printing V4L2 and DRM fourccs

- From: Andy Shevchenko \<andriy.shevchenko@linux.intel.com\>
- Date: 2021-02-09 10:20:50 
- List: linux-media
- Page: https://ratatoskr.run/linux-media/2021/02/6264154
- Thread: https://ratatoskr.run/linux-media/2021/02/6263469/t.md

```text
On Mon, Feb 08, 2021 at 10:58:55PM +0200, Andy Shevchenko wrote:
> On Mon, Feb 08, 2021 at 10:43:30PM +0200, Andy Shevchenko wrote:
> > On Mon, Feb 8, 2021 at 10:11 PM Sakari Ailus
> > [ref] wrote:

...

> __le32 val;
> 
> val = cpu_to_le32(*fourcc & ~BIT(31));
> 
> p += string_escape_mem(&val, sizeof(*fourcc), output, sizeof(output), ESCAPE_NP | ESCAPE_HEX, NULL);

sizeof(val) and as we are discussing in parallel emails something like
skip_trailing_spaces() to be applied after above.

The rationale of the above, that we reuse existing code and existing standard
for the escaping non-printable characters.

-- 
With Best Regards,
Andy Shevchenko


```