linux-kernel - Re: [RFC][PATCH 1/5] lib: add unpack_hex

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Date:	Fri, 16 Sep 2011 16:11:06 +0300
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	linux-security-module@...r.kernel.org,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	David Safford <safford@...son.ibm.com>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	target-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 1/5] lib: add unpack_hex_byte()

On Fri, Sep 16, 2011 at 3:50 PM, Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
> Since converting 2 ascii hex digits into a byte with error checks
> is commonly used, we can replace multiple hex_to_bin() calls with
> a single call to unpack_hex_byte().
>
> Changelog:
> - Error checking added based on Tetsuo Handa's patch.
> - Moved the hex2bin code here, making it into a static inline function.
>  (Andy Shevchenko's request.)
>
> Signed-off-by: Mimi Zohar <zohar@...ux.vnet.ibm.com>
> ---
>  include/linux/kernel.h |   21 +++++++++++++++++++++
>  1 files changed, 21 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index 46ac9a5..d8ea13b 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -385,6 +385,27 @@ extern int hex_to_bin(char ch);
>  extern void hex2bin(u8 *dst, const char *src, size_t count);
>
>  /*
> + * unpack_hex_byte - convert 2 asii hex digits into a byte
> + * @byte: binary result
> + * @buf: ascii hexadecimal byte string
> + */
> +static inline bool unpack_hex_byte(u8 *byte, const char *buf)
> +{
> +       int hi, lo;
> +
> +       hi = hex_to_bin(buf[0]);
> +       if (hi < 0)
> +               return false;
> +
> +       lo = hex_to_bin(buf[1]);
> +       if (lo < 0)
> +               return false;
> +
> +       *byte = (hi << 4) | lo;
> +       return true;
> +}
> +
> +/*
>  * General tracing related utility functions - trace_printk(),
>  * tracing_on/tracing_off and tracing_start()/tracing_stop
>  *

Acked-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

-- 
With Best Regards,
Andy Shevchenko
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