socket: Add one more helper

src/core/dbus-socket.c

@@ -44,30 +44,12 @@ static int property_get_listen(
 
         LIST_FOREACH(port, p, s->ports) {
                 _cleanup_free_ char *address = NULL;
-                const char *a;
 
-                switch (p->type) {
-                        case SOCKET_SOCKET: {
-                                r = socket_address_print(&p->address, &address);
-                                if (r)
-                                        return r;
+                r = socket_port_to_address(p, &address);
+                if (r < 0)
+                        return r;
 
-                                a = address;
-                                break;
-                        }
-
-                        case SOCKET_SPECIAL:
-                        case SOCKET_MQUEUE:
-                        case SOCKET_FIFO:
-                        case SOCKET_USB_FUNCTION:
-                                a = p->path;
-                                break;
-
-                        default:
-                                assert_not_reached();
-                }
-
-                r = sd_bus_message_append(reply, "(ss)", socket_port_type_to_string(p), a);
+                r = sd_bus_message_append(reply, "(ss)", socket_port_type_to_string(p), address);
                 if (r < 0)
                         return r;
         }

src/core/socket.c

@@ -2866,6 +2866,40 @@ static const char *socket_sub_state_to_string(Unit *u) {
         return socket_state_to_string(SOCKET(u)->state);
 }
 
+int socket_port_to_address(const SocketPort *p, char **ret) {
+        _cleanup_free_ char *address = NULL;
+        int r;
+
+        assert(p);
+        assert(ret);
+
+        switch (p->type) {
+                case SOCKET_SOCKET: {
+                        r = socket_address_print(&p->address, &address);
+                        if (r < 0)
+                                return r;
+
+                        break;
+                }
+
+                case SOCKET_SPECIAL:
+                case SOCKET_MQUEUE:
+                case SOCKET_FIFO:
+                case SOCKET_USB_FUNCTION:
+                        address = strdup(p->path);
+                        if (!address)
+                                return -ENOMEM;
+                        break;
+
+                default:
+                        assert_not_reached();
+        }
+
+        *ret = TAKE_PTR(address);
+
+        return 0;
+}
+
 const char* socket_port_type_to_string(SocketPort *p) {
 
         assert(p);

src/core/socket.h

@@ -180,6 +180,8 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(SocketPort*, socket_port_free);
 
 void socket_free_ports(Socket *s);
 
+int socket_port_to_address(const SocketPort *s, char **ret);
+
 int socket_load_service_unit(Socket *s, int cfd, Unit **ret);
 
 char *socket_fdname(Socket *s);