Re: [PATCH] psql: tab completion for ALTER ROLE ... IN DATABASE ...

Hi zeng,

Thanks for pointing this out. You’re absolutely right — PQescapeLiteral()
allocates memory using libpq’s allocator, so the returned buffers must be
released with PQfreemem() rather than pfree(). Using pfree() here would be
incorrect, since it expects memory allocated via PostgreSQL’s memory
context APIs (palloc/psprintf).

I’ll update the patch to replace pfree() with PQfreemem() for the buffers
returned by PQescapeLiteral(),while continuing to use pfree() for memory
allocated via psprintf().

Thanks again for catching this.

Best regards,
Vasuki M
C-DAC,Chennai

On Mon, 22 Dec 2025, 8:18 pm zengman, <zengman(at)halodbtech(dot)com> wrote:

> Hi
>
> I noticed that in the code, the variables `q_role` and `q_dbname` are
> processed with the `PQescapeLiteral` function,
> so `PQfreemem` – instead of `pfree` – should be used here to free the
> memory.
>
> --
> Regards,
> Man Zeng
> www.openhalo.org