linux-kernel - Re: [PATCH 1/3] hexdump: more output formatting

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Date:	Thu, 31 May 2007 03:26:31 +0530
From:	"Satyam Sharma" <satyam.sharma@...il.com>
To:	"Randy Dunlap" <randy.dunlap@...cle.com>
Cc:	"Christoph Lameter" <clameter@....com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, hugh@...itas.com
Subject: Re: [PATCH 1/3] hexdump: more output formatting

Hello Randy,

> Add a prefix string parameter.  Callers are responsible for any
> string length/alignment that they want to see in the output.  I.e.,
> callers should pad strings to achieve alignment if they want that.
>
> Add rowsize parameter.  This is the number of raw data bytes
> to be printed per line.  Must be 16 or 32.
>
> Add a group_size parameter.  This allows callers to dump values
> as 1-byte, 2-byte, 4-byte, or 8-byte numbers.  Default is
> 1-byte numbers.  If the total length is not an even multiple
> of group_size, 1-byte numbers are printed.

I wonder if (over-)engineering could hurt its adoption by more kernel
users. There aren't very many 8-argument monsters in the kernel,
and one would expect hexdump() to be easier on the fingers to
type? :-) Why not just continue with reasonable default/fixed rowsize
and groupsize values?

> Add an "ascii" output parameter.  This causes ASCII data output
> following the hex data output.
[...]
> +       if (!ascii)
> +               goto nil;
> +
> +       if ((lx + 1) < linebuflen)
>                 linebuf[lx++] = ' ';
> -       }
> -       for (j = 0; (j < 16) && (j < len) && (lx + 2) < linebuflen; j++)
> +       for (j = 0; (j < rowsize) && (j < len) && (lx + 2) < linebuflen; j++)
>                 linebuf[lx++] = isprint(ptr[j]) ? ptr[j] : '.';
> +nil:
>         linebuf[lx++] = '\0';

if (ascii) {
...
}

linebuf[lx++] = '\0';

would help lose a goto and label.

Satyam
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