encoding names

Hi,

before some time I was discuss with Tatsuo and Thomas about support
for synonyms of encoding names (for example allows to use
"ISO-8859-1" as the encoding name) and use binary search for searching
in encoding names.
I mean that we can during this change a little clean up encoding
stuff too. Now PG use for same operations with encoding names different
routines on FE and BE. IMHO it's a little strange. Well, here is a
possible solution:

- use 'enum' instead current #define for encoding identificators
(in pg_wchar.h).

- create separate table only with encoding names for conversion from
encoding name (char) to encoding numerical identificator,
and searching routines based on binary search (from Knut -- see
datetime.c).

All these will *shared* between FE and BE.

- For BE create table that handle conversion functions (like current
pg_conv_tbl[]). All items in this table will available by access to
array, like 'pg_conv_tbl[ LATIN1 ]', instead current search via for()
cycle.

May be also define all tables as 'static' and work with it by some
routines only. PG has like robust code :-)

Comments, better ideas?

Karel

--
Karel Zak <zakkr(at)zf(dot)jcu(dot)cz>
http://home.zf.jcu.cz/~zakkr/

C, PostgreSQL, PHP, WWW, http://docs.linux.cz, http://mape.jcu.cz