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Date: Sat, 19 Oct 2013 22:22:18 -0400
From: Rich Felker <>
Subject: Re: inet_pton problem

On Sat, Oct 19, 2013 at 10:57:00PM +0200, Paul Schutte wrote:
> Hi,
> I came across this and believe it is a bug.
> I have found that when you set str to an IPv4 addr of the from
> "' while the address family is AF_INET6, then instead of
> returning a 0 to indicate an invalid IPv6 string, it is converted to
> gibberish.

>From what I can tell, it's not converted to gibberish; instead, it's
wrongly returning an error (-1) instead of a result indicating an
invalid input string (0). One could argue that it's a programming
error not to check this, but inet_pton should not have any reason to
return -1 if the first argument (af) is valid, so one could also argue
that such checks would be extraneous bloat.

> inet_pton(AF_INET6, "', &sa) should return 0 if I understand the
> specification correctly.



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