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Subject: Re: [PATCH v4 5/7] lib/hexdump.c: Allow multiple groups to be
 separated by lines '|'
From:   Joe Perches <joe@perches.com>
To:     Alastair D'Silva <alastair@au1.ibm.com>, alastair@d-silva.org
Cc:     Jani Nikula <jani.nikula@linux.intel.com>,
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        Enric Balletbo i Serra <enric.balletbo@collabora.com>,
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Date:   Mon, 24 Jun 2019 22:37:03 -0700
In-Reply-To: <20190625031726.12173-6-alastair@au1.ibm.com>
References: <20190625031726.12173-1-alastair@au1.ibm.com>
         <20190625031726.12173-6-alastair@au1.ibm.com>
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On Tue, 2019-06-25 at 13:17 +1000, Alastair D'Silva wrote:
> From: Alastair D'Silva <alastair@d-silva.org>
> 
> With the wider display format, it can become hard to identify how many
> bytes into the line you are looking at.
> 
> The patch adds new flags to hex_dump_to_buffer() and print_hex_dump() to
> print vertical lines to separate every N groups of bytes.
> 
> eg.
> buf:00000000: 454d414e 43415053|4e495f45 00584544  NAMESPAC|E_INDEX.
> buf:00000010: 00000000 00000002|00000000 00000000  ........|........
> 
> Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
> ---
>  include/linux/printk.h |  3 +++
>  lib/hexdump.c          | 59 ++++++++++++++++++++++++++++++++++++------
>  2 files changed, 54 insertions(+), 8 deletions(-)
> 
> diff --git a/include/linux/printk.h b/include/linux/printk.h
[]
> @@ -485,6 +485,9 @@ enum {
>  
>  #define HEXDUMP_ASCII			BIT(0)
>  #define HEXDUMP_SUPPRESS_REPEATED	BIT(1)
> +#define HEXDUMP_2_GRP_LINES		BIT(2)
> +#define HEXDUMP_4_GRP_LINES		BIT(3)
> +#define HEXDUMP_8_GRP_LINES		BIT(4)

These aren't really bits as only one value should be set
as 8 overrides 4 and 4 overrides 2.

I would also expect this to be a value of 2 in your above
example, rather than 8.  It's described as groups not bytes.

The example is showing a what would normally be a space ' '
separator as a vertical bar '|' every 2nd grouping.