From: jameskuyper@alumni.caltech.edu

On 2025-11-17 18:49, Michael Sanders wrote:
> On Fri, 14 Nov 2025 21:03:38 -0000 (UTC), Michael Sanders wrote:
>
>> Well, I finally got bitten by Unicode.
>>
>> [...]
>
> Smallest Unicode test I can manage. Might prove handy in some contexts:
>
> #include 
> #include 
> #include 
>
> int got_unicode(void){
>     char *l = setlocale(LC_CTYPE,"");
>     return (l && strstr(l,"UTF-8"));
> }
>
> #define U(uni, asc) (got_unicode() ? (uni) : (asc))
>
> int main(void){
>     printf("%s\n", U("Unicode OK: ✓", "No Unicode."));
>     return 0;
> }

Could you identify which document guarantees that every Unicode locale
contains "UTF-8"? Do you know what the domain of applicability of that
document is? It apparently does not cover my Ubuntu Linux system. The
command "locale -a" provides a list of all supported locales. Here's
what it says:

C
C.utf8
en_AG
en_AG.utf8
en_AU.utf8
en_BW.utf8
en_CA.utf8
en_DK.utf8
en_GB.utf8
en_HK.utf8
en_IE.utf8
en_IL
en_IL.utf8
en_IN
en_IN.utf8
en_NG
en_NG.utf8
en_NZ.utf8
en_PH.utf8
en_SG.utf8
en_US.utf8
en_ZA.utf8
en_ZM
en_ZM.utf8
en_ZW.utf8
es_AR.utf8
es_BO.utf8
es_CL.utf8
es_CO.utf8
es_CR.utf8
es_CU
es_CU.utf8
es_DO.utf8
es_EC.utf8
es_ES.utf8
es_GT.utf8
es_HN.utf8
es_MX.utf8
es_NI.utf8
es_PA.utf8
es_PE.utf8
es_PR.utf8
es_PY.utf8
es_SV.utf8
es_US.utf8
es_UY.utf8
es_VE.utf8
POSIX
ru_RU.utf8
ru_UA.utf8
uk_UA.utf8
zh_HK.utf8
zh_TW.utf8

Are you aware that there's many other Unicode encodings, including
UTF-16, UTF-32, GB18030, BOCU, SCSU, UTF-EBCDIC, and UTF-7.

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