[patch] Fix BZ #18660 -- overflow in getusershell

[Mike Frysinger]

On 26 Aug 2015 23:07, Tolga Dalman wrote:
> your proposal looks good to me (I read it and wrote a small test program).
> In fact, I see it as a great improvement to the status quo.
> 
> Have you integrated your version and tried to add a test case as proposed earlier ?

all i've done is post this patch.  if people are happy with it and the
direction, i can add some tests.
-mike
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