static void
pickout(PGconn *conn, Oid lobjId, pg_int64 start, int len)
{
int lobj_fd;
char *buf;
int nbytes;
int nread;
lobj_fd = lo_open(conn, lobjId, INV_READ);
if (lobj_fd < 0)
fprintf(stderr, "cannot open large object %u", lobjId);
if (lo_lseek64(conn, lobj_fd, start, SEEK_SET) < 0)
fprintf(stderr, "error in lo_lseek64: %s", PQerrorMessage(conn));
if (lo_tell64(conn, lobj_fd) != start)
fprintf(stderr, "error in lo_tell64: %s", PQerrorMessage(conn));
buf = malloc(len + 1);
nread = 0;
while (len - nread > 0)
{
nbytes = lo_read(conn, lobj_fd, buf, len - nread);
buf[nbytes] = '\0';
fprintf(stderr, ">>> %s", buf);
nread += nbytes;
if (nbytes <= 0)
break; /* no more data? */
}
free(buf);
fprintf(stderr, "\n");
lo_close(conn, lobj_fd);
}
RAISES_NEG Py_ssize_t
lobject_tell(lobjectObject *self)
{
PGresult *pgres = NULL;
char *error = NULL;
Py_ssize_t where;
Dprintf("lobject_tell: fd = %d", self->fd);
Py_BEGIN_ALLOW_THREADS;
pthread_mutex_lock(&(self->conn->lock));
#ifdef HAVE_LO64
if (self->conn->server_version < 90300) {
where = (Py_ssize_t)lo_tell(self->conn->pgconn, self->fd);
} else {
where = (Py_ssize_t)lo_tell64(self->conn->pgconn, self->fd);
}
#else
where = (Py_ssize_t)lo_tell(self->conn->pgconn, self->fd);
#endif
Dprintf("lobject_tell: where = " FORMAT_CODE_PY_SSIZE_T, where);
if (where < 0)
collect_error(self->conn, &error);
pthread_mutex_unlock(&(self->conn->lock));
Py_END_ALLOW_THREADS;
if (where < 0)
pq_complete_error(self->conn, &pgres, &error);
return where;
}
