I wrote:
> Why not just use a loop ? Something like:
> 
>       for (i = 0; i != 6; i++)
>               if (!inc_hexchar(mac+18-i))
>                       break;

Hmm, I have to work on my reading skills. That should have been
more like this:

        for (i = 0; i != 8; i++) {
                if ((i % 3) == 2)
                        continue;
                if (!inc_hexchar(mac+18-i))
                        break;
        }

- Werner

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