Fix bugs in PQhost().

In the platform that doesn't support Unix-domain socket, when
neither host nor hostaddr are specified, the default host
'localhost' is used to connect to the server and PQhost() must
return that, but it didn't. This patch fixes PQhost() so that
it returns the default host in that case.

Also this patch fixes PQhost() so that it doesn't return
Unix-domain socket directory path in the platform that doesn't
support Unix-domain socket.

Back-patch to all supported versions.

diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 0f0dd651eb398afeec7afe29ef4e93958c4bf5f2..4de86f284633ed30523d2cd4fd3c29fc87b8dd5b 100644 (file)
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -5148,7 +5148,16 @@ PQhost(const PGconn *conn)
 {
        if (!conn)
                return NULL;
-       return conn->pghost ? conn->pghost : conn->pgunixsocket;
+       if (conn->pghost != NULL && conn->pghost[0] != '\0')
+               return conn->pghost;
+       else
+       {
+#ifdef HAVE_UNIX_SOCKETS
+               return conn->pgunixsocket;
+#else
+               return DefaultHost;
+#endif
+       }
 }
 
 char *