Re: \if, \elseif, \else, \endif (was Re: PSQL commands: \quit_if, \quit_unless)

>> ISTM that PQExpBuffer is partially a memory leak. Something should need
>> to be freed?
>
> I copied that pattern from somewhere else, so yeah, I duplicated whatever
> leak was there.

Hmmm. Indeed some commands do not free, but there is a single use and the
commands exits afterwards, eg "createuser".

I think that you could use another pattern where you init the
PQExpBufferData structure instead of create it, so that only the string is
malloced.

>> I think that you should use appendPQExpBufferChar and Str instead of
>> relying on the format variant which is probably expensive. Something like:
>>
>> if (num_options > 0)
>> append...Char(buf, ' ');
>> append...Str(buf, ...);
>
> All flavors of appendPQExpBuffer*() I can find have a const *char format
> string, so no way to append a naked string. If you know differently, I'm
> listening. Not fixed.

These prototypes are from "pqexpbuffer.h", and do not seem to rely on a
format:

extern void appendPQExpBufferChar(PQExpBuffer str, char ch);
extern void appendPQExpBufferStr(PQExpBuffer str, const char *data);

--
Fabien