linux-kernel - Re: [PATCH v2 04/10] lib/vsprintf: add %*pE[achnops] format specifier

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Message-ID: <1404751810.27043.90.camel@joe-AO725>
Date:	Mon, 07 Jul 2014 09:50:10 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	"John W . Linville" <linville@...driver.com>,
	Johannes Berg <johannes@...solutions.net>,
	devel@...verdev.osuosl.org, linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 04/10] lib/vsprintf: add %*pE[achnops] format
 specifier

On Mon, 2014-07-07 at 18:21 +0300, Andy Shevchenko wrote:

> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
[]
>  static noinline_for_stack
> +char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
> +		     const char *fmt)
[]
> +	if (spec.field_width == 0)
> +		/* nothing to print */
> +		return buf;
[]
> +	len = spec.field_width < 0 ? 1 : spec.field_width;

If field_width is not specified, emit a single byte?

Perhaps better if -1 was accepted by string_escape_mem
as a strlen request or just ignored as a 0 length is
above.

fyi: hex_string emits nothing on printk("%ph", buf);


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