Re: [HACKERS] libpq+MB/putenv(), getenv() clean up

> I think it is a very good idea to remove getenv() from PQmblen().
> getenv() is rather slow, at least on the machines I use, and having
> to do it for each character processed is a huge performance hit.

I didn't notice that. Thanks for the point.

> PQmblen is exported by libpq (psql is an example of an application
> that uses it).  So very possibly, changing it would break a few client
> applications.  A possible answer is to leave PQmblen alone, and invent
> a new routine with a different name that looks at PGconn.  We could
> deprecate PQmblen and delete it after a few releases.  I'm not sure
> if this is worth the trouble or not --- maybe it's OK to make a non-
> compatible change to PQmblen.

With the changes I propose, PQmblen() would not work anymore
anyway. I'll post to interfaces list about the incompatible changes.

> You would still do one getenv() during connection setup, right, to see
> if PGCLIENTENCODING is set?

Yes. 

>If you don't, that would be a significant
> change in behavior that might make a lot of people unhappy.

So the behavior won't be changed.
--
Tatsuo Ishii