Re: [PATCH 1/9] lib/vsprintf.c: Add %pU to print UUID/GUIDs

[Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>]

On Thu, Oct 1, 2009 at 09:26, Joe Perches <joe@xxxxxxxxxxx> wrote:
> On Thu, 2009-10-01 at 09:10 +0200, Geert Uytterhoeven wrote:
>> > Standardize the printed style of UUID/GUIDs by using
>> > another extension to %p.
>> >
>> > %pU:    01020304-0506-0708-090a-0b0c0d0e0f10
>> > %pUr:   04030201-0605-0807-090a-0b0c0d0e0f10
>> > %pU[r]X:Use upper case hex
>>
>> To me, it looks a bit strange to have the options after the `U', combined 
>> with
>> the variable-length nature.
>
> I think the whole %p<foo> mechanism is strange and takes
> a bit of getting used to.
>
> You're free to suggest alternatives.
>
> Keep in mind expansion for future different types and that
> <foo> must be alphanumeric chars only.

`r' is reverse endianness?

So what about
    %pUb: lower case big endian
    %pUl: lower case little endian
    %pUB: upper case big endian
    %pUL: upper case little endian
?

That way it's fixed length, and easier to parse.

Gr{oetje,eeting}s,

                                                Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                                            -- Linus Torvalds