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

[Randy Dunlap <randy.dunlap@oracle.com>]

Satyam Sharma wrote:
> 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?

Yes, one can try to satisfy the users/callers by adapting to their
needs (wishes), which requires parameters or such; or one can have
no callers and end up with (around 11 currently) different hex dump
functions in the kernel source tree, but no users of lib/hexdump.c.

But it won't take much more "requirements" for me to drop the patch.

> > 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.

The label has another reference already, so it wouldn't be lost.

But the if (ascii) block could be added...

--
~Randy
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