Re: libpq/c function question

"Joe Conway" <joe.conway@mail.com> writes:
>     optstr = PG_GETARG_TEXT_P(0);
>     jpgsql = PG_GETARG_TEXT_P(1);

>     conn = PQconnectdb(VARDATA(optstr));

I think you've missed the fact that a TEXT value's VARDATA is not
null-terminated.  There are numerous examples of transforming a TEXT
into a C string in the backend, see for example text_cmp/varstr_cmp
in src/backend/utils/adt/varlena.c.
        regards, tom lane