tr not respecting UTF-8 locale ?

[Michał Kosmulski]

hello,
I am using a UTF-8 locale and all coreutils except for tr seem to agree 
on that. However, tr behaves differently and seems to always assume that 
1 byte == 1 character even in a UTF-8 locale. Consider this:

address@hidden:~$ locale
LANG=en_US.UTF-8
LC_CTYPE=pl_PL.UTF-8
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE=pl_PL.UTF-8
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER=pl_PL.UTF-8
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT=pl_PL.UTF-8
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=
address@hidden:~$ tr äöü aou
xxäyyözzütt
xxuoyyuuzzuutt
address@hidden:~$ tr ä ab
xäy
xaby

IMO, this clearly indicates that tr considers each character to be 
exactly one byte wide. In the case of "tr äöü aou" all three umlauts 
have the same first byte, so the last substitution for that byte is 
effective, that's why ä becomes uo and not ao in that case.
Michal Kosmulski

--
Michal Kosmulski
http://hektor.umcs.lublin.pl/~mikosmul/