Patch for ip6_sprintf(), please review

[Alfred Perlstein]

Thank you Doug,

I will be committing this shortly.

* Doug Barton <dougb at FreeBSD.org> [100516 12:21] wrote:
> Someone at work has been reading
> http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation :)
> 
> This change follows the rules in that draft which will become and RFC as
> soon as it finishes winding its way through the process, so I am
> supportive of the change you are proposing.
> 
> 
> Doug
> 
> On 5/15/2010 11:22 PM, Alfred Perlstein wrote:
> > Hello,
> > 
> > The following patch seems appropriate to apply
> > to fix the kernel ip6_sprintf() function.
> > 
> > What it is doing is ensuring that when we
> > abbreviate addresses that the longest string
> > of zeros is shortend, not the first run of
> > zeros.
> > 
> > Our internal commit log is:
> > problem:
> > Unification of IPv6 address representation
> > fix:
> > recommended format of text representing an IPv6 address
> > is summarized as follows.
> > 
> > 1. omit leading zeros
> > 
> > 2. "::" used to their maximum extent whenever possible
> > 
> > 3. "::" used where shortens address the most
> > 
> > 4. "::" used in the former part in case of a tie breaker
> > 
> > 5. do not shorten one 16 bit 0 field
> > 
> > 6. use lower case
> > 
> > Present code in ip6_sprintf() is following rules 1,2,5,6.
> > Adding fix for following other rules also.For following
> > rules 3 and 4, finding out the index where to replace zero's
> > with '::' and using that index.
> > References:
> > http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-04.html
> > 
> > 
> > Diff is attached in text format.
> > 
> > 
> > 
> > 
> > _______________________________________________
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> 
> 
> 
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-- 
- Alfred Perlstein
.- AMA, VMOA #5191, 03 vmax, 92 gs500, 85 ch250, 07 zx10
.- FreeBSD committer