>>>>> "TL" == Tom Lane <tgl@sss.pgh.pa.us> writes:
TL> writes: upper/lower aren't TL> going to work desirably in any multi-byte character set TL> encoding.
>> Can you please point me at their implementation? I do not >> understand why that's impossible.
TL> Because they use <ctype.h>'s toupper() and tolower() TL> functions, which only work on single-byte
characters.
Aha, that's in src/backend/utils/adt/formatting.c, right?
Yes, I see, it goes byte by byte and uses toupper(). I believe we
could look at the locale, and if it is UTF-8, then use (or copy)
e.g. g_utf8_strup/strdown, right?
http://developer.gnome.org/doc/API/2.0/glib/glib-Unicode-Manipulation.html#g-utf8-strup
I belive that patch could be written in a matter of hours.
TL> There has been some discussion of using <wctype.h> where TL> available, but this has a number of issues,
notablyfiguring TL> out the correct mapping from the server string encoding (eg TL> UTF-8) to unpacked wide
characters. At minimum we'd need to TL> know which charset the locale setting is expecting, and there TL> doesn't
seemto be a portable way to find that out.
TL> IIRC, Peter thinks we must abandon use of libc's locale TL> functionality altogether and write our own locale
layerbefore TL> we can really have all the locale-specific functionality we TL> want.
I believe that native Unicode strings (together with human language
handling) should be introduced as (almost) separate data type (which
have nothing to do with locale), but that's bluesky maybe.
--alexm
