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Message-ID: <20261009014641.GO23438@brightrain.aerifal.cx>
Date: Thu, 8 Oct 2026 21:46:42 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: fnmatch: invalid multibyte sequence in the string is
taken as end of string ("" matches "\xff" in UTF-8 locales)
On Fri, Oct 09, 2026 at 12:25:31PM +1100, raf wrote:
> On Thu, Oct 08, 2026 at 09:44:20PM +0200, Thorsten Glaser <tg@...bsd.de> wrote:
>
> > On Thu, 8 Oct 2026, Rich Felker wrote:
> >
> > >Putting byte strings that are not valid characters into filenames is
> > >generally not a supported usage (by musl or by the standards).
> >
> > It is, in POSIX. Filenames are indeed just bytes, not characters;
> > arbitrary bytes except slash and NUL.
> >
> > bye,
> > //mirabilos
> > --
> > “It is inappropriate to require that a time represented as
> > seconds since the Epoch precisely represent the number of
> > seconds between the referenced time and the Epoch.”
> > -- IEEE Std 1003.1b-1993 (POSIX) Section B.2.2.2
>
> Linux, FreeBSD, OpenBSD, NetBSD, and Solaris allow binary filenames.
> Windows/Cygwin and macOS are the only systems I have that require them
> to be text.
>
> Also, if one user's locale uses UTF-8, and another user on the same
> system uses a Latin-1 locale, there can be text filenames created
> by one user that look like binary to the other user.
A musl-based system doesn't have users with latin-1 locales because it
does not have latin-1 locales.
"All text is UTF-8" was one of the founding principles of musl. That's
why we have iconv interfaces to support reading/converting legacy data
(and in some cases, speaking it over legacy protocols) but don't have
any way to use these as the multibyte encoding.
Yes it's possible to use hybrid system with multiple libcs present in
the same filesystem. It's now 2026 and the advisible way to do this
even 15 years ago when musl first appeared was to use UTF-8 for all of
them. If you really insist on not doing that, nobody can stop you, but
it's not usage the project aims to facilitate.
Rich
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