linux-kernel - Re: [PATCHv3 2/3] lib: printf: append support of '%*ph[CDN]'

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Message-ID: <CAHp75VfOjRL3w-tFLkyWAy3eh-wUOmCd9i5BGscoW=noqjbmBA@mail.gmail.com>
Date:	Thu, 5 Jul 2012 11:02:28 +0300
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>, proski@....org,
	Andrei Emeltchenko <andrei.emeltchenko@...el.com>,
	linux-wireless@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Larry Finger <Larry.Finger@...inger.net>
Subject: Re: [PATCHv3 2/3] lib: printf: append support of '%*ph[CDN]'

On Wed, Jul 4, 2012 at 6:09 PM, Joe Perches <joe@...ches.com> wrote:
> On Wed, 2012-07-04 at 11:45 +0300, Andy Shevchenko wrote:
>> This patch adds a support of the variable width buffer to print it
>> as a hex string with a delimiter.

>> +     if (spec.field_width <= 0)
>> +             /* nothing to print */
>> +             return buf;
>
> It may be better to default to a 1 and add
>
>         if (addr == ZERO_OR_NULL_PTR)
>
> to avoid dereferencing a NULL or a pointer
> to a zero length object.
Good point.

>> +             for (p = hex_str; *p != '\0'; p++) {
>> +                     if (buf < end)
>> +                             *buf = *p;
>> +                     ++buf;
>> +             }
>
> why not just directly write to *buf as long as buf < end?
buf < end - 1, otherwise correct.
And yes, it eliminates hex_str array as well.

-- 
With Best Regards,
Andy Shevchenko
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