linux-kernel - Re: [PATCH v2] vsprintf: automatic parameters for %pIS via 'a'

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Date:	Fri, 5 Feb 2016 14:06:43 +0100
From:	"Jason A. Donenfeld" <Jason@...c4.com>
To:	Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:	Joe Perches <joe@...ches.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	andriy.shevchenko@...ux.intel.com,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] vsprintf: automatic parameters for %pIS via 'a'

On Fri, Feb 5, 2016 at 1:06 AM, Rasmus Villemoes
<linux@...musvillemoes.dk> wrote:
> First of all I don't think vsprintf.c should be extended with yet
> another piece of unused code, so I hope there's an actual user coming.

There is. Don't worry.

>
> Second, please add tests to lib/test_printf.c.

Sure, no problem. I'll add this in the next version.

>
> Third, wouldn't it be more convenient/flexible if a meant "print those
> that are present _and_ requested"; that is, the above would be
>
>> +             have_p = have_p && sa->sin6_port;
>> +             have_s = have_s && sa->sin6_scope_id;
>> +             have_f = have_f && sa->sin6_flowinfo & IPV6_FLOWINFO_MASK;
>
> that way one could say %pISaf and have the flowinfo if and only if it's
> present, without also unintentionally turning on port or scope_id.

That's a great idea. I'll make this change too for the next version.