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From: Christian Weisgerber <naddy@mips.inka.de>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: locale/LC_CTYPE vs strcasecmp?
Date: Tue, 26 Mar 2024 19:47:03 -0000 (UTC)
Message-ID: <slrnv069hn.tsn.naddy@lorvorc.mips.inka.de>
References: <ydfrwdgujk.fsf@UBEblock.psr.com>
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On 2024-03-26, Winston <wbe@UBEBLOCK.psr.com.invalid> wrote:

> The man page says strcasecmp_l() takes an explicit locale.
> The implication is that strcasecmp() uses the current locale
> (presumably as set by setlocale()).

Yes.
src/lib/libc/string/strcasecmp.c:

     57 int
     58 strcasecmp(const char *s1, const char *s2)
     59 {
     60         return strcasecmp_l(s1, s2, __get_locale());
     61 }

> After calling setlocale(LC_ALL, "uk_UA.UTF-8"), I'm seeing that
> strcasecmp() is not, in fact, case-independently matching non-ASCII
> UTF-8 strings: it's case sensitive (the ASCII equivalent in this
> case being that "Abc" isn't matching "abc").

UTF-8 characters are multibyte.  You need to convert the strings
to wide characters and use wcscasecmp().

-- 
Christian "naddy" Weisgerber                          naddy@mips.inka.de