util: add wlr_addon

1 files changed, 49 insertions, 0 deletions

diff --git a/util/addon.c b/util/addon.c
new file mode 100644
index 00000000..7de54a73
--- /dev/null
+++ b/util/addon.c
@@ -0,0 +1,49 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <wayland-server-core.h>
+
+#include "wlr/util/addon.h"
+
+void wlr_addon_set_init(struct wlr_addon_set *set) {
+	wl_list_init(&set->addons);
+}
+
+void wlr_addon_set_finish(struct wlr_addon_set *set) {
+	struct wlr_addon *addon, *tmp;
+	wl_list_for_each_safe(addon, tmp, &set->addons, link) {
+		wlr_addon_finish(addon);
+		addon->impl->destroy(addon);
+	}
+}
+
+void wlr_addon_init(struct wlr_addon *addon, struct wlr_addon_set *set,
+		const void *owner, const struct wlr_addon_interface *impl) {
+	assert(owner);
+	struct wlr_addon *iter;
+	wl_list_for_each(iter, &set->addons, link) {
+		if (iter->owner == addon->owner) {
+			assert(0 && "Can't have two addons with the same owner");
+		}
+	}
+	wl_list_insert(&set->addons, &addon->link);
+	addon->owner = owner;
+	addon->impl = impl;
+}
+
+void wlr_addon_finish(struct wlr_addon *addon) {
+	if (addon->owner) {
+		addon->owner = NULL;
+		wl_list_remove(&addon->link);
+	}
+}
+
+struct wlr_addon *wlr_addon_find_by_owner(struct wlr_addon_set *set,
+		const void *owner) {
+	struct wlr_addon *addon;
+	wl_list_for_each(addon, &set->addons, link) {
+		if (addon->owner == owner) {
+			return addon;
+		}
+	}
+	return NULL;
+}