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Date: Tue, 5 Aug 2014 17:23:18 -0400
From: Rich Felker <>
Subject: Re: Bug report on iswalpha

On Tue, Aug 05, 2014 at 02:10:25PM -0700, Alon Zakai wrote:
> I see what you mean, yes, this does seem like undefined behavior then, as
> it's invalid in that locale. Thanks for the quick response!

Just to be clear -- given musl's current C locale, it's not UB in
musl. In musl's current C locale, mbtowc() for "\xc3\xb4" produces
(wchar_t)0xf4, so the behavior is well-defined and the "true" result
is correct. On the other hand, the behavior is undefined for glibc.


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