Function connectOptions2

src/interfaces/libpq/fe-connect.c:1095–1527

* connectOptions2 * * Compute derived connection options after absorbing all user-supplied info. * * Returns true if OK, false if trouble (in which case errorMessage is set * and so is conn->status). */

 * and so is conn->status).
 */
static bool
connectOptions2(PGconn *conn)
{
	int			i;

	/*
	 * Allocate memory for details about each host to which we might possibly
	 * try to connect.  For that, count the number of elements in the hostaddr
	 * or host options.  If neither is given, assume one host.
	 */
	conn->whichhost = 0;
	if (conn->pghostaddr && conn->pghostaddr[0] != '\0')
		conn->nconnhost = count_comma_separated_elems(conn->pghostaddr);
	else if (conn->pghost && conn->pghost[0] != '\0')
		conn->nconnhost = count_comma_separated_elems(conn->pghost);
	else
		conn->nconnhost = 1;
	conn->connhost = (pg_conn_host *)
		calloc(conn->nconnhost, sizeof(pg_conn_host));
	if (conn->connhost == NULL)
		goto oom_error;

	/*
	 * We now have one pg_conn_host structure per possible host.  Fill in the
	 * host and hostaddr fields for each, by splitting the parameter strings.
	 */
	if (conn->pghostaddr != NULL && conn->pghostaddr[0] != '\0')
	{
		char	   *s = conn->pghostaddr;
		bool		more = true;

		for (i = 0; i < conn->nconnhost && more; i++)
		{
			conn->connhost[i].hostaddr = parse_comma_separated_list(&s, &more);
			if (conn->connhost[i].hostaddr == NULL)
				goto oom_error;
		}

		/*
		 * If hostaddr was given, the array was allocated according to the
		 * number of elements in the hostaddr list, so it really should be the
		 * right size.
		 */
		Assert(!more);
		Assert(i == conn->nconnhost);
	}

	if (conn->pghost != NULL && conn->pghost[0] != '\0')
	{
		char	   *s = conn->pghost;
		bool		more = true;

		for (i = 0; i < conn->nconnhost && more; i++)
		{
			conn->connhost[i].host = parse_comma_separated_list(&s, &more);
			if (conn->connhost[i].host == NULL)
				goto oom_error;
		}