Merge branch 'master' into feature/xwm-selection

17 files changed, 128 insertions, 117 deletions

diff --git a/backend/libinput/backend.c b/backend/libinput/backend.c
index 45b4e368..1028e238 100644
--- a/backend/libinput/backend.c
+++ b/backend/libinput/backend.c
@@ -69,9 +69,9 @@ static bool wlr_libinput_backend_start(struct wlr_backend *_backend) {
 			no_devs = NULL;
 		}
 	}
-	if (!no_devs && backend->wlr_device_lists->length == 0) {
+	if (!no_devs && backend->wlr_device_lists.length == 0) {
 		wlr_libinput_readable(libinput_fd, WL_EVENT_READABLE, backend);
-		if (backend->wlr_device_lists->length == 0) {
+		if (backend->wlr_device_lists.length == 0) {
 			wlr_log(L_ERROR, "libinput initialization failed, no input devices");
 			wlr_log(L_ERROR, "Set WLR_LIBINPUT_NO_DEVICES=1 to suppress this check");
 			return false;
@@ -97,9 +97,10 @@ static void wlr_libinput_backend_destroy(struct wlr_backend *_backend) {
 	if (!_backend) {
 		return;
 	}
-	struct wlr_libinput_backend *backend = (struct wlr_libinput_backend *)_backend;
-	for (size_t i = 0; i < backend->wlr_device_lists->length; i++) {
-		struct wl_list *wlr_devices = backend->wlr_device_lists->items[i];
+	struct wlr_libinput_backend *backend =
+		(struct wlr_libinput_backend *)_backend;
+	for (size_t i = 0; i < backend->wlr_device_lists.length; i++) {
+		struct wl_list *wlr_devices = backend->wlr_device_lists.items[i];
 		struct wlr_input_device *wlr_dev, *next;
 		wl_list_for_each_safe(wlr_dev, next, wlr_devices, link) {
 			wl_signal_emit(&backend->backend.events.input_remove, wlr_dev);
@@ -107,7 +108,7 @@ static void wlr_libinput_backend_destroy(struct wlr_backend *_backend) {
 		}
 		free(wlr_devices);
 	}
-	wlr_list_free(backend->wlr_device_lists);
+	wlr_list_finish(&backend->wlr_device_lists);
 	wl_event_source_remove(backend->input_event);
 	libinput_unref(backend->libinput_context);
 	free(backend);
@@ -148,7 +149,7 @@ struct wlr_backend *wlr_libinput_backend_create(struct wl_display *display,
 	}
 	wlr_backend_init(&backend->backend, &backend_impl);
 
-	if (!(backend->wlr_device_lists = wlr_list_create())) {
+	if (!wlr_list_init(&backend->wlr_device_lists)) {
 		wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
 		goto error_backend;
 	}
diff --git a/backend/libinput/events.c b/backend/libinput/events.c
index 3ca41124..c14aef01 100644
--- a/backend/libinput/events.c
+++ b/backend/libinput/events.c
@@ -147,7 +147,7 @@ static void handle_device_added(struct wlr_libinput_backend *backend,
 
 	if (wl_list_length(wlr_devices) > 0) {
 		libinput_device_set_user_data(libinput_dev, wlr_devices);
-		wlr_list_add(backend->wlr_device_lists, wlr_devices);
+		wlr_list_push(&backend->wlr_device_lists, wlr_devices);
 	} else {
 		free(wlr_devices);
 	}
@@ -177,9 +177,9 @@ static void handle_device_removed(struct wlr_libinput_backend *backend,
 		wl_signal_emit(&backend->backend.events.input_remove, dev);
 		wlr_input_device_destroy(dev);
 	}
-	for (size_t i = 0; i < backend->wlr_device_lists->length; i++) {
-		if (backend->wlr_device_lists->items[i] == wlr_devices) {
-			wlr_list_del(backend->wlr_device_lists, i);
+	for (size_t i = 0; i < backend->wlr_device_lists.length; i++) {
+		if (backend->wlr_device_lists.items[i] == wlr_devices) {
+			wlr_list_del(&backend->wlr_device_lists, i);
 			break;
 		}
 	}
diff --git a/dummy.c b/dummy.c
deleted file mode 100644
index 870fde8a..00000000
--- a/dummy.c
+++ /dev/null
@@ -1,2 +0,0 @@
-// This is used to make meson happy
-void dummy(void);
diff --git a/examples/pointer.c b/examples/pointer.c
index 8fafb3d6..f75e1bce 100644
--- a/examples/pointer.c
+++ b/examples/pointer.c
@@ -46,7 +46,7 @@ struct sample_state {
 	struct wl_listener touch_up;
 	struct wl_listener touch_down;
 	struct wl_listener touch_cancel;
-	struct wlr_list *touch_points;
+	struct wl_list touch_points;
 
 	struct wl_listener tablet_tool_axis;
 	struct wl_listener tablet_tool_proxmity;
@@ -57,22 +57,25 @@ struct sample_state {
 struct touch_point {
 	int32_t touch_id;
 	double x, y;
+	struct wl_list link;
 };
 
 static void warp_to_touch(struct sample_state *sample,
 		struct wlr_input_device *dev) {
-	if (sample->touch_points->length == 0) {
+	if (wl_list_empty(&sample->touch_points)) {
 		return;
 	}
 
 	double x = 0, y = 0;
-	for (size_t i = 0; i < sample->touch_points->length; ++i) {
-		struct touch_point *point = sample->touch_points->items[i];
+	size_t n = 0;
+	struct touch_point *point;
+	wl_list_for_each(point, &sample->touch_points, link) {
 		x += point->x;
 		y += point->y;
+		n++;
 	}
-	x /= sample->touch_points->length;
-	y /= sample->touch_points->length;
+	x /= n;
+	y /= n;
 	wlr_cursor_warp_absolute(sample->cursor, dev, x, y);
 }
 
@@ -197,10 +200,11 @@ static void handle_cursor_axis(struct wl_listener *listener, void *data) {
 static void handle_touch_up(struct wl_listener *listener, void *data) {
 	struct sample_state *sample = wl_container_of(listener, sample, touch_up);
 	struct wlr_event_touch_up *event = data;
-	for (size_t i = 0; i < sample->touch_points->length; ++i) {
-		struct touch_point *point = sample->touch_points->items[i];
+
+	struct touch_point *point, *tmp;
+	wl_list_for_each_safe(point, tmp, &sample->touch_points, link) {
 		if (point->touch_id == event->touch_id) {
-			wlr_list_del(sample->touch_points, i);
+			wl_list_remove(&point->link);
 			break;
 		}
 	}
@@ -215,9 +219,7 @@ static void handle_touch_down(struct wl_listener *listener, void *data) {
 	point->touch_id = event->touch_id;
 	point->x = event->x_mm / event->width_mm;
 	point->y = event->y_mm / event->height_mm;
-	if (wlr_list_add(sample->touch_points, point) == -1) {
-		free(point);
-	}
+	wl_list_insert(&sample->touch_points, &point->link);
 
 	warp_to_touch(sample, event->device);
 }
@@ -226,8 +228,9 @@ static void handle_touch_motion(struct wl_listener *listener, void *data) {
 	struct sample_state *sample =
 		wl_container_of(listener, sample, touch_motion);
 	struct wlr_event_touch_motion *event = data;
-	for (size_t i = 0; i < sample->touch_points->length; ++i) {
-		struct touch_point *point = sample->touch_points->items[i];
+
+	struct touch_point *point;
+	wl_list_for_each(point, &sample->touch_points, link) {
 		if (point->touch_id == event->touch_id) {
 			point->x = event->x_mm / event->width_mm;
 			point->y = event->y_mm / event->height_mm;
@@ -257,7 +260,6 @@ int main(int argc, char *argv[]) {
 	struct sample_state state = {
 		.default_color = { 0.25f, 0.25f, 0.25f, 1 },
 		.clear_color = { 0.25f, 0.25f, 0.25f, 1 },
-		.touch_points = wlr_list_create(),
 	};
 
 	state.config = parse_args(argc, argv);
@@ -266,6 +268,7 @@ int main(int argc, char *argv[]) {
 	wlr_cursor_attach_output_layout(state.cursor, state.layout);
 	wlr_cursor_map_to_region(state.cursor, state.config->cursor.mapped_box);
 	wl_list_init(&state.devices);
+	wl_list_init(&state.touch_points);
 
 	// pointer events
 	wl_signal_add(&state.cursor->events.motion, &state.cursor_motion);
diff --git a/examples/touch.c b/examples/touch.c
index d1891525..f18b5d26 100644
--- a/examples/touch.c
+++ b/examples/touch.c
@@ -24,12 +24,13 @@
 struct sample_state {
 	struct wlr_renderer *renderer;
 	struct wlr_texture *cat_texture;
-	struct wlr_list *touch_points;
+	struct wl_list touch_points;
 };
 
 struct touch_point {
 	int32_t touch_id;
 	double x, y;
+	struct wl_list link;
 };
 
 static void handle_output_frame(struct output_state *output, struct timespec *ts) {
@@ -44,14 +45,14 @@ static void handle_output_frame(struct output_state *output, struct timespec *ts
 	wlr_renderer_begin(sample->renderer, wlr_output);
 
 	float matrix[16];
-	for (size_t i = 0; i < sample->touch_points->length; ++i) {
-		struct touch_point *p = sample->touch_points->items[i];
+	struct touch_point *p;
+	wl_list_for_each(p, &sample->touch_points, link) {
 		wlr_texture_get_matrix(sample->cat_texture, &matrix,
 			&wlr_output->transform_matrix,
 			(int)(p->x * width) - sample->cat_texture->width / 2,
 			(int)(p->y * height) - sample->cat_texture->height / 2);
 		wlr_render_with_matrix(sample->renderer,
-				sample->cat_texture, &matrix);
+			sample->cat_texture, &matrix);
 	}
 
 	wlr_renderer_end(sample->renderer);
@@ -65,17 +66,15 @@ static void handle_touch_down(struct touch_state *tstate, int32_t touch_id,
 	point->touch_id = touch_id;
 	point->x = x / width;
 	point->y = y / height;
-	if (wlr_list_add(sample->touch_points, point) == -1) {
-		free(point);
-	}
+	wl_list_insert(&sample->touch_points, &point->link);
 }
 
 static void handle_touch_up(struct touch_state *tstate, int32_t touch_id) {
 	struct sample_state *sample = tstate->compositor->data;
-	for (size_t i = 0; i < sample->touch_points->length; ++i) {
-		struct touch_point *point = sample->touch_points->items[i];
+	struct touch_point *point, *tmp;
+	wl_list_for_each_safe(point, tmp, &sample->touch_points, link) {
 		if (point->touch_id == touch_id) {
-			wlr_list_del(sample->touch_points, i);
+			wl_list_remove(&point->link);
 			break;
 		}
 	}
@@ -84,8 +83,8 @@ static void handle_touch_up(struct touch_state *tstate, int32_t touch_id) {
 static void handle_touch_motion(struct touch_state *tstate, int32_t touch_id,
 		double x, double y, double width, double height) {
 	struct sample_state *sample = tstate->compositor->data;
-	for (size_t i = 0; i < sample->touch_points->length; ++i) {
-		struct touch_point *point = sample->touch_points->items[i];
+	struct touch_point *point;
+	wl_list_for_each(point, &sample->touch_points, link) {
 		if (point->touch_id == touch_id) {
 			point->x = x / width;
 			point->y = y / height;
@@ -95,9 +94,9 @@ static void handle_touch_motion(struct touch_state *tstate, int32_t touch_id,
 }
 
 int main(int argc, char *argv[]) {
-	struct sample_state state = {
-		.touch_points = wlr_list_create()
-	};
+	struct sample_state state;
+	wl_list_init(&state.touch_points);
+
 	struct compositor_state compositor = { 0,
 		.data = &state,
 		.output_frame_cb = handle_output_frame,
diff --git a/include/backend/drm/drm.h b/include/backend/drm/drm.h
index e08965e5..4fad9678 100644
--- a/include/backend/drm/drm.h
+++ b/include/backend/drm/drm.h
@@ -14,7 +14,6 @@
 #include <wlr/backend/drm.h>
 #include <wlr/types/wlr_output.h>
 #include <wlr/render/egl.h>
-#include <wlr/types/wlr_list.h>
 
 #include "iface.h"
 #include "properties.h"
diff --git a/include/backend/libinput.h b/include/backend/libinput.h
index 93b859a7..be2557ed 100644
--- a/include/backend/libinput.h
+++ b/include/backend/libinput.h
@@ -18,7 +18,7 @@ struct wlr_libinput_backend {
 
 	struct wl_listener session_signal;
 
-	struct wlr_list *wlr_device_lists;
+	struct wlr_list wlr_device_lists; // list of struct wl_list
 };
 
 struct wlr_libinput_input_device {
diff --git a/include/wlr/types/wlr_list.h b/include/wlr/types/wlr_list.h
index 8ddd30b6..78a30995 100644
--- a/include/wlr/types/wlr_list.h
+++ b/include/wlr/types/wlr_list.h
@@ -2,6 +2,7 @@
 #define WLR_UTIL_LIST_H
 
 #include <stddef.h>
+#include <stdbool.h>
 
 struct wlr_list {
 	size_t capacity;
@@ -10,51 +11,65 @@ struct wlr_list {
 };
 
 /**
- * Creates a new list, may return `NULL` on failure
+ * Initialize a list. Returns true on success, false on failure.
  */
-struct wlr_list *wlr_list_create(void);
-void wlr_list_free(struct wlr_list *list);
-void wlr_list_foreach(struct wlr_list *list, void (*callback)(void *item));
+bool wlr_list_init(struct wlr_list *list);
+
 /**
- * Add `item` to the end of a list.
- * Returns: new list length or `-1` on failure
+ * Deinitialize a list.
  */
-int wlr_list_add(struct wlr_list *list, void *item);
+void wlr_list_finish(struct wlr_list *list);
+
+/**
+ * Executes `callback` on each element in the list.
+ */
+void wlr_list_for_each(struct wlr_list *list, void (*callback)(void *item));
+
 /**
  * Add `item` to the end of a list.
- * Returns: new list length or `-1` on failure
+ * Returns: new list length or `-1` on failure.
  */
-int wlr_list_push(struct wlr_list *list, void *item);
+ssize_t wlr_list_push(struct wlr_list *list, void *item);
+
 /**
- * Place `item` into index `index` in the list
- * Returns: new list length or `-1` on failure
+ * Place `item` into index `index` in the list.
+ * Returns: new list length or `-1` on failure.
  */
-int wlr_list_insert(struct wlr_list *list, size_t index, void *item);
+ssize_t wlr_list_insert(struct wlr_list *list, size_t index, void *item);
+
 /**
- * Remove an item from the list
+ * Remove an item from the list.
  */
 void wlr_list_del(struct wlr_list *list, size_t index);
+
 /**
- * Remove and return an item from the end of the list
+ * Remove and return an item from the end of the list.
  */
 void *wlr_list_pop(struct wlr_list *list);
+
 /**
- * Get a reference to the last item of a list without removal
+ * Get a reference to the last item of a list without removal.
  */
 void *wlr_list_peek(struct wlr_list *list);
+
+/**
+ * Append each item in `source` to `list`.
+ * Does not modify `source`.
+ * Returns: new list length or `-1` on failure.
+ */
+ssize_t wlr_list_cat(struct wlr_list *list, const struct wlr_list *source);
+
 /**
- * Append each item in `source` to `list`
- * Does not modify `source`
- * Returns: new list length or `-1` on failure
- */
-int wlr_list_cat(struct wlr_list *list, struct wlr_list *source);
-// See qsort. Remember to use *_qsort functions as compare functions,
-// because they dereference the left and right arguments first!
-void wlr_list_qsort(struct wlr_list *list, int compare(const void *left, const void *right));
-// Return index for first item in list that returns 0 for given compare
-// function or -1 if none matches.
-int wlr_list_seq_find(struct wlr_list *list,
-		int compare(const void *item, const void *cmp_to),
-		const void *cmp_to);
+ * Sort a list using `qsort`.
+ */
+void wlr_list_qsort(struct wlr_list *list,
+	int compare(const void *left, const void *right));
+
+/**
+ * Return the index of the first item in the list that returns 0 for the given
+ * `compare` function, or -1 if none matches.
+ */
+ssize_t wlr_list_find(struct wlr_list *list,
+	int compare(const void *item, const void *cmp_to), const void *cmp_to);
 
 #endif
diff --git a/include/wlr/xwayland.h b/include/wlr/xwayland.h
index 6518b703..9b493d88 100644
--- a/include/wlr/xwayland.h
+++ b/include/wlr/xwayland.h
@@ -5,7 +5,6 @@
 #include <stdbool.h>
 #include <wlr/types/wlr_compositor.h>
 #include <xcb/xcb.h>
-#include <wlr/types/wlr_list.h>
 
 #ifdef HAS_XCB_ICCCM
 	#include <xcb/xcb_icccm.h>
@@ -86,7 +85,6 @@ struct wlr_xwayland_surface {
 	char *class;
 	char *instance;
 	struct wlr_xwayland_surface *parent;
-	struct wlr_list *state; // list of xcb_atom_t
 	pid_t pid;
 
 	xcb_atom_t *window_type;
diff --git a/meson.build b/meson.build
index 642dc38d..8ace085c 100644
--- a/meson.build
+++ b/meson.build
@@ -131,7 +131,6 @@ wlr_deps = [
 
 lib_wlr = library(
 	'wlroots',
-	files('dummy.c'),
 	link_whole: wlr_parts,
 	dependencies: wlr_deps,
 	include_directories: wlr_inc,
diff --git a/rootston/desktop.c b/rootston/desktop.c
index cf5a8cdc..65730807 100644
--- a/rootston/desktop.c
+++ b/rootston/desktop.c
@@ -181,15 +181,12 @@ bool view_center(struct roots_view *view) {
 void view_destroy(struct roots_view *view) {
 	wl_signal_emit(&view->events.destroy, view);
 
-	wl_list_remove(&view->link);
 	free(view);
 }
 
 void view_init(struct roots_view *view, struct roots_desktop *desktop) {
 	view->desktop = desktop;
 	wl_signal_init(&view->events.destroy);
-
-	wl_list_insert(&desktop->views, &view->link);
 }
 
 void view_setup(struct roots_view *view) {
diff --git a/rootston/wl_shell.c b/rootston/wl_shell.c
index 7359c878..d0f5989b 100644
--- a/rootston/wl_shell.c
+++ b/rootston/wl_shell.c
@@ -83,6 +83,7 @@ static void handle_destroy(struct wl_listener *listener, void *data) {
 	wl_list_remove(&roots_surface->request_set_maximized.link);
 	wl_list_remove(&roots_surface->set_state.link);
 	wl_list_remove(&roots_surface->surface_commit.link);
+	wl_list_remove(&roots_surface->view->link);
 	view_destroy(roots_surface->view);
 	free(roots_surface);
 }
@@ -131,6 +132,7 @@ void handle_wl_shell_surface(struct wl_listener *listener, void *data) {
 	view->close = close;
 	roots_surface->view = view;
 	view_init(view, desktop);
+	wl_list_insert(&desktop->views, &view->link);
 
 	view_setup(view);
 
diff --git a/rootston/xdg_shell_v6.c b/rootston/xdg_shell_v6.c
index 656231c7..ea19753b 100644
--- a/rootston/xdg_shell_v6.c
+++ b/rootston/xdg_shell_v6.c
@@ -165,6 +165,7 @@ static void handle_destroy(struct wl_listener *listener, void *data) {
 	wl_list_remove(&roots_xdg_surface->destroy.link);
 	wl_list_remove(&roots_xdg_surface->request_move.link);
 	wl_list_remove(&roots_xdg_surface->request_resize.link);
+	wl_list_remove(&roots_xdg_surface->view->link);
 	view_destroy(roots_xdg_surface->view);
 	free(roots_xdg_surface);
 }
@@ -220,6 +221,7 @@ void handle_xdg_shell_v6_surface(struct wl_listener *listener, void *data) {
 	view->close = close;
 	roots_surface->view = view;
 	view_init(view, desktop);
+	wl_list_insert(&desktop->views, &view->link);
 
 	view_setup(view);
 }
diff --git a/rootston/xwayland.c b/rootston/xwayland.c
index c92c424b..dfa602b1 100644
--- a/rootston/xwayland.c
+++ b/rootston/xwayland.c
@@ -95,6 +95,8 @@ static void maximize(struct roots_view *view, bool maximized) {
 static void handle_destroy(struct wl_listener *listener, void *data) {
 	struct roots_xwayland_surface *roots_surface =
 		wl_container_of(listener, roots_surface, destroy);
+	struct wlr_xwayland_surface *xwayland_surface =
+		roots_surface->view->xwayland_surface;
 	wl_list_remove(&roots_surface->destroy.link);
 	wl_list_remove(&roots_surface->request_configure.link);
 	wl_list_remove(&roots_surface->request_move.link);
@@ -102,6 +104,9 @@ static void handle_destroy(struct wl_listener *listener, void *data) {
 	wl_list_remove(&roots_surface->request_maximize.link);
 	wl_list_remove(&roots_surface->map_notify.link);
 	wl_list_remove(&roots_surface->unmap_notify.link);
+	if (xwayland_surface->mapped) {
+		wl_list_remove(&roots_surface->view->link);
+	}
 	view_destroy(roots_surface->view);
 	free(roots_surface);
 }
@@ -243,6 +248,7 @@ void handle_xwayland_surface(struct wl_listener *listener, void *data) {
 	view->close = close;
 	roots_surface->view = view;
 	view_init(view, desktop);
+	wl_list_insert(&desktop->views, &view->link);
 
 	if (!surface->override_redirect) {
 		view_setup(view);
diff --git a/types/wlr_list.c b/types/wlr_list.c
index 33e3ea8a..565a155b 100644
--- a/types/wlr_list.c
+++ b/types/wlr_list.c
@@ -3,26 +3,23 @@
 #include <stdbool.h>
 #include <string.h>
 #include <stddef.h>
+#include <sys/types.h>
 #include <wlr/types/wlr_list.h>
 
-struct wlr_list *wlr_list_create(void) {
-	struct wlr_list *list = malloc(sizeof(struct wlr_list));
-	if (!list) {
-		return NULL;
-	}
+bool wlr_list_init(struct wlr_list *list) {
 	list->capacity = 10;
 	list->length = 0;
-	list->items = malloc(sizeof(void*) * list->capacity);
-	if (!list->items) {
-		free(list);
-		return NULL;
+	list->items = malloc(sizeof(void *) * list->capacity);
+	if (list->items == NULL) {
+		return false;
 	}
-	return list;
+	return true;
 }
 
 static bool list_resize(struct wlr_list *list) {
 	if (list->length == list->capacity) {
-		void *new_items = realloc(list->items, sizeof(void*) * (list->capacity + 10));
+		void *new_items = realloc(list->items,
+			sizeof(void *) * (list->capacity + 10));
 		if (!new_items) {
 			return false;
 		}
@@ -32,24 +29,17 @@ static bool list_resize(struct wlr_list *list) {
 	return true;
 }
 
-void wlr_list_free(struct wlr_list *list) {
-	if (list == NULL) {
-		return;
-	}
+void wlr_list_finish(struct wlr_list *list) {
 	free(list->items);
-	free(list);
 }
 
-void wlr_list_foreach(struct wlr_list *list, void (*callback)(void *item)) {
-	if (list == NULL || callback == NULL) {
-		return;
-	}
+void wlr_list_for_each(struct wlr_list *list, void (*callback)(void *item)) {
 	for (size_t i = 0; i < list->length; i++) {
 		callback(list->items[i]);
 	}
 }
 
-int wlr_list_add(struct wlr_list *list, void *item) {
+ssize_t wlr_list_push(struct wlr_list *list, void *item) {
 	if (!list_resize(list)) {
 		return -1;
 	}
@@ -57,15 +47,12 @@ int wlr_list_add(struct wlr_list *list, void *item) {
 	return list->length;
 }
 
-int wlr_list_push(struct wlr_list *list, void *item) {
-	return wlr_list_add(list, item);
-}
-
-int wlr_list_insert(struct wlr_list *list, size_t index, void *item) {
+ssize_t wlr_list_insert(struct wlr_list *list, size_t index, void *item) {
 	if (!list_resize(list)) {
 		return -1;
 	}
-	memmove(&list->items[index + 1], &list->items[index], sizeof(void*) * (list->length - index));
+	memmove(&list->items[index + 1], &list->items[index],
+		sizeof(void *) * (list->length - index));
 	list->length++;
 	list->items[index] = item;
 	return list->length;
@@ -73,24 +60,31 @@ int wlr_list_insert(struct wlr_list *list, size_t index, void *item) {
 
 void wlr_list_del(struct wlr_list *list, size_t index) {
 	list->length--;
-	memmove(&list->items[index], &list->items[index + 1], sizeof(void*) * (list->length - index));
+	memmove(&list->items[index], &list->items[index + 1],
+		sizeof(void *) * (list->length - index));
 }
 
 void *wlr_list_pop(struct wlr_list *list) {
-	void *_ = list->items[list->length - 1];
+	if (list->length == 0) {
+		return NULL;
+	}
+	void *last = list->items[list->length - 1];
 	wlr_list_del(list, list->length - 1);
-	return _;
+	return last;
 }
 
 void *wlr_list_peek(struct wlr_list *list) {
+	if (list->length == 0) {
+		return NULL;
+	}
 	return list->items[list->length - 1];
 }
 
-int wlr_list_cat(struct wlr_list *list, struct wlr_list *source) {
+ssize_t wlr_list_cat(struct wlr_list *list, const struct wlr_list *source) {
 	size_t old_len = list->length;
 	size_t i;
 	for (i = 0; i < source->length; ++i) {
-		if (wlr_list_add(list, source->items[i]) == -1) {
+		if (wlr_list_push(list, source->items[i]) == -1) {
 			list->length = old_len;
 			return -1;
 		}
@@ -98,13 +92,13 @@ int wlr_list_cat(struct wlr_list *list, struct wlr_list *source) {
 	return list->length;
 }
 
-void wlr_list_qsort(struct wlr_list *list, int compare(const void *left, const void *right)) {
+void wlr_list_qsort(struct wlr_list *list,
+		int compare(const void *left, const void *right)) {
 	qsort(list->items, list->length, sizeof(void *), compare);
 }
 
-int wlr_list_seq_find(struct wlr_list *list,
-		int compare(const void *item, const void *data),
-		const void *data) {
+ssize_t wlr_list_find(struct wlr_list *list,
+		int compare(const void *item, const void *data), const void *data) {
 	for (size_t i = 0; i < list->length; i++) {
 		void *item = list->items[i];
 		if (compare(item, data) == 0) {
diff --git a/types/wlr_output.c b/types/wlr_output.c
index 411dd404..94fe4c3b 100644
--- a/types/wlr_output.c
+++ b/types/wlr_output.c
@@ -9,7 +9,6 @@
 #include <wlr/types/wlr_output.h>
 #include <wlr/types/wlr_surface.h>
 #include <wlr/interfaces/wlr_output.h>
-#include <wlr/types/wlr_list.h>
 #include <wlr/util/log.h>
 #include <GLES2/gl2.h>
 #include <wlr/render/matrix.h>
diff --git a/xwayland/xwm.c b/xwayland/xwm.c
index febe1ea2..39cd6362 100644
--- a/xwayland/xwm.c
+++ b/xwayland/xwm.c
@@ -221,7 +221,6 @@ static void wlr_xwayland_surface_destroy(
 	free(xsurface->title);
 	free(xsurface->class);
 	free(xsurface->instance);
-	wlr_list_free(xsurface->state);
 	free(xsurface->window_type);
 	free(xsurface->protocols);
 	free(xsurface->hints);