Refactor wlr_list inside wlroots

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;
 	}

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;
 		}
 	}

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"

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 {

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

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;

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) {

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>

xwayland/xwm.c

@@ -217,7 +217,6 @@ 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);