[PATCH wayland] server: add helper functions for wl_global

[Jonny Lamb]

The intention here is to be able to find an existing wl_global using
some search parameters and then get some information about it.
---
 src/wayland-server.c | 33 +++++++++++++++++++++++++++++++++
 src/wayland-server.h |  4 ++++
 2 files changed, 37 insertions(+)

diff --git a/src/wayland-server.c b/src/wayland-server.c
index 0558634..5dd6c71 100644
--- a/src/wayland-server.c
+++ b/src/wayland-server.c
@@ -945,6 +945,39 @@ wl_global_destroy(struct wl_global *global)
 	free(global);
 }
 
+WL_EXPORT void *
+wl_global_get_data(struct wl_global *global)
+{
+	return global->data;
+}
+
+WL_EXPORT struct wl_global *
+wl_global_find(struct wl_display *display,
+	const struct wl_interface *interface, uint32_t version,
+	void *data, wl_global_bind_func_t bind)
+{
+	struct wl_global *global;
+
+	/* return with nothing if we have no search parameters */
+	if (interface == NULL && version == 0 && data == NULL && bind == NULL)
+		return NULL;
+
+	wl_list_for_each(global, &display->global_list, link) {
+		if (interface != NULL && global->interface != interface)
+			continue;
+		if (version != 0 && global->version != version)
+			continue;
+		if (data != NULL && global->data != data)
+			continue;
+		if (bind != NULL && global->bind != bind)
+			continue;
+
+		return global;
+	}
+
+	return NULL;
+}
+
 /** Get the current serial number
  *
  * \param display The display object
diff --git a/src/wayland-server.h b/src/wayland-server.h
index af2f03d..05449dc 100644
--- a/src/wayland-server.h
+++ b/src/wayland-server.h
@@ -113,6 +113,10 @@ struct wl_global *wl_global_create(struct wl_display *display,
 				   int version,
 				   void *data, wl_global_bind_func_t bind);
 void wl_global_destroy(struct wl_global *global);
+void *wl_global_get_data(struct wl_global *global);
+struct wl_global *wl_global_find(struct wl_display *display,
+	const struct wl_interface *interface, uint32_t version,
+	void *data, wl_global_bind_func_t bind);
 
 struct wl_client *wl_client_create(struct wl_display *display, int fd);
 void wl_client_destroy(struct wl_client *client);
-- 
2.1.4