Use struct initializers instead of memset()

This is a bit more type-safe.

CONTRIBUTING.md

@@ -197,8 +197,8 @@ Functions that are responsible for constructing objects should take one of the
 two following forms:
 
 * `init`: for functions which accept a pointer to a pre-allocated object (e.g.
-a member of a struct) and initialize it. Such functions must call `memset()`
-to zero out the memory before initializing it to avoid leaving unset fields.
+a member of a struct) and initialize it. Such functions must zero out the
+memory before initializing it to avoid leaving unset fields.
 * `create`: for functions which allocate the memory for an object, initialize
 it, and return a pointer. Such functions should allocate the memory with
 `calloc()` to avoid leaving unset fields.

backend/backend.c

@@ -40,8 +40,9 @@
 
 void wlr_backend_init(struct wlr_backend *backend,
 		const struct wlr_backend_impl *impl) {
-	memset(backend, 0, sizeof(*backend));
-	backend->impl = impl;
+	*backend = (struct wlr_backend){
+		.impl = impl,
+	};
 	wl_signal_init(&backend->events.destroy);
 	wl_signal_init(&backend->events.new_input);
 	wl_signal_init(&backend->events.new_output);

backend/drm/atomic.c

@@ -50,7 +50,7 @@ struct atomic {
 };
 
 static void atomic_begin(struct atomic *atom) {
-	memset(atom, 0, sizeof(*atom));
+	*atom = (struct atomic){0};
 
 	atom->req = drmModeAtomicAlloc();
 	if (!atom->req) {

backend/drm/drm.c

@@ -445,11 +445,12 @@ static bool drm_crtc_commit(struct wlr_drm_connector *conn,
 static void drm_connector_state_init(struct wlr_drm_connector_state *state,
 		struct wlr_drm_connector *conn,
 		const struct wlr_output_state *base) {
-	memset(state, 0, sizeof(*state));
-	state->base = base;
-	state->modeset = base->allow_artifacts;
-	state->active = (base->committed & WLR_OUTPUT_STATE_ENABLED) ?
-		base->enabled : conn->output.enabled;
+	*state = (struct wlr_drm_connector_state){
+		.base = base,
+		.modeset = base->allow_artifacts,
+		.active = (base->committed & WLR_OUTPUT_STATE_ENABLED) ?
+			base->enabled : conn->output.enabled,
+	};
 
 	if (base->committed & WLR_OUTPUT_STATE_MODE) {
 		switch (base->mode_type) {
@@ -1028,7 +1029,7 @@ static void drm_connector_destroy_output(struct wlr_output *output) {
 		free(mode);
 	}
 
-	memset(&conn->output, 0, sizeof(struct wlr_output));
+	conn->output = (struct wlr_output){0};
 }
 
 static const struct wlr_drm_format_set *drm_connector_get_cursor_formats(

backend/drm/renderer.c

@@ -55,7 +55,7 @@ static void finish_drm_surface(struct wlr_drm_surface *surf) {
 
 	wlr_swapchain_destroy(surf->swapchain);
 
-	memset(surf, 0, sizeof(*surf));
+	*surf = (struct wlr_drm_surface){0};
 }
 
 bool init_drm_surface(struct wlr_drm_surface *surf,

render/allocator/allocator.c

@@ -22,9 +22,10 @@
 void wlr_allocator_init(struct wlr_allocator *alloc,
 		const struct wlr_allocator_interface *impl, uint32_t buffer_caps) {
 	assert(impl && impl->destroy && impl->create_buffer);
-	memset(alloc, 0, sizeof(*alloc));
-	alloc->impl = impl;
-	alloc->buffer_caps = buffer_caps;
+	*alloc = (struct wlr_allocator){
+		.impl = impl,
+		.buffer_caps = buffer_caps,
+	};
 	wl_signal_init(&alloc->events.destroy);
 }
 

render/drm_format_set.c

@@ -86,8 +86,9 @@ bool wlr_drm_format_set_add(struct wlr_drm_format_set *set, uint32_t format,
 }
 
 void wlr_drm_format_init(struct wlr_drm_format *fmt, uint32_t format) {
-	memset(fmt, 0, sizeof(*fmt));
-	fmt->format = format;
+	*fmt = (struct wlr_drm_format){
+		.format = format,
+	};
 }
 
 bool wlr_drm_format_has(const struct wlr_drm_format *fmt, uint64_t modifier) {

render/gles2/texture.c

@@ -373,8 +373,9 @@ struct wlr_texture *gles2_texture_from_buffer(struct wlr_renderer *wlr_renderer,
 void wlr_gles2_texture_get_attribs(struct wlr_texture *wlr_texture,
 		struct wlr_gles2_texture_attribs *attribs) {
 	struct wlr_gles2_texture *texture = gles2_get_texture(wlr_texture);
-	memset(attribs, 0, sizeof(*attribs));
-	attribs->target = texture->target;
-	attribs->tex = texture->tex;
-	attribs->has_alpha = texture->has_alpha;
+	*attribs = (struct wlr_gles2_texture_attribs){
+		.target = texture->target,
+		.tex = texture->tex,
+		.has_alpha = texture->has_alpha,
+	};
 }

render/pass.c

@@ -15,8 +15,9 @@ struct wlr_render_pass_legacy {
 void wlr_render_pass_init(struct wlr_render_pass *render_pass,
 		const struct wlr_render_pass_impl *impl) {
 	assert(impl->submit && impl->add_texture && impl->add_rect);
-	memset(render_pass, 0, sizeof(*render_pass));
-	render_pass->impl = impl;
+	*render_pass = (struct wlr_render_pass){
+		.impl = impl,
+	};
 }
 
 bool wlr_render_pass_submit(struct wlr_render_pass *render_pass) {

render/swapchain.c

@@ -42,7 +42,7 @@ static void slot_reset(struct wlr_swapchain_slot *slot) {
 		wl_list_remove(&slot->release.link);
 	}
 	wlr_buffer_drop(slot->buffer);
-	memset(slot, 0, sizeof(*slot));
+	*slot = (struct wlr_swapchain_slot){0};
 }
 
 void wlr_swapchain_destroy(struct wlr_swapchain *swapchain) {

render/wlr_renderer.c

@@ -44,8 +44,9 @@ void wlr_renderer_init(struct wlr_renderer *renderer,
 	assert(impl->get_shm_texture_formats);
 	assert(impl->get_render_buffer_caps);
 
-	memset(renderer, 0, sizeof(*renderer));
-	renderer->impl = impl;
+	*renderer = (struct wlr_renderer){
+		.impl = impl,
+	};
 
 	wl_signal_init(&renderer->events.destroy);
 	wl_signal_init(&renderer->events.lost);

render/wlr_texture.c

@@ -10,11 +10,12 @@ void wlr_texture_init(struct wlr_texture *texture, struct wlr_renderer *renderer
 		const struct wlr_texture_impl *impl, uint32_t width, uint32_t height) {
 	assert(renderer);
 
-	memset(texture, 0, sizeof(*texture));
-	texture->renderer = renderer;
-	texture->impl = impl;
-	texture->width = width;
-	texture->height = height;
+	*texture = (struct wlr_texture){
+		.renderer = renderer,
+		.impl = impl,
+		.width = width,
+		.height = height,
+	};
 }
 
 void wlr_texture_destroy(struct wlr_texture *texture) {

types/buffer/buffer.c

@@ -11,10 +11,11 @@ void wlr_buffer_init(struct wlr_buffer *buffer,
 		assert(impl->begin_data_ptr_access && impl->end_data_ptr_access);
 	}
 
-	memset(buffer, 0, sizeof(*buffer));
-	buffer->impl = impl;
-	buffer->width = width;
-	buffer->height = height;
+	*buffer = (struct wlr_buffer){
+		.impl = impl,
+		.width = width,
+		.height = height,
+	};
 	wl_signal_init(&buffer->events.destroy);
 	wl_signal_init(&buffer->events.release);
 	wlr_addon_set_init(&buffer->addons);

types/buffer/dmabuf.c

@@ -57,7 +57,7 @@ bool dmabuf_buffer_drop(struct wlr_dmabuf_buffer *buffer) {
 		if (!wlr_dmabuf_attributes_copy(&saved_dmabuf, &buffer->dmabuf)) {
 			wlr_log(WLR_ERROR, "Failed to save DMA-BUF");
 			ok = false;
-			memset(&buffer->dmabuf, 0, sizeof(buffer->dmabuf));
+			buffer->dmabuf = (struct wlr_dmabuf_attributes){0};
 		} else {
 			buffer->dmabuf = saved_dmabuf;
 			buffer->saved = true;

types/data_device/wlr_data_source.c

@@ -14,11 +14,12 @@ void wlr_data_source_init(struct wlr_data_source *source,
 		const struct wlr_data_source_impl *impl) {
 	assert(impl->send);
 
-	memset(source, 0, sizeof(*source));
-	source->impl = impl;
+	*source = (struct wlr_data_source){
+		.impl = impl,
+		.actions = -1,
+	};
 	wl_array_init(&source->mime_types);
 	wl_signal_init(&source->events.destroy);
-	source->actions = -1;
 }
 
 void wlr_data_source_send(struct wlr_data_source *source, const char *mime_type,

types/output/output.c

@@ -332,15 +332,17 @@ void wlr_output_init(struct wlr_output *output, struct wlr_backend *backend,
 		assert(impl->set_cursor && impl->move_cursor);
 	}
 
-	memset(output, 0, sizeof(*output));
-	output->backend = backend;
-	output->impl = impl;
-	output->display = display;
+	*output = (struct wlr_output){
+		.backend = backend,
+		.impl = impl,
+		.display = display,
+		.render_format = DRM_FORMAT_XRGB8888,
+		.transform = WL_OUTPUT_TRANSFORM_NORMAL,
+		.scale = 1,
+		.commit_seq = 0,
+	};
+
 	wl_list_init(&output->modes);
-	output->render_format = DRM_FORMAT_XRGB8888;
-	output->transform = WL_OUTPUT_TRANSFORM_NORMAL;
-	output->scale = 1;
-	output->commit_seq = 0;
 	wl_list_init(&output->cursors);
 	wl_list_init(&output->layers);
 	wl_list_init(&output->resources);

types/scene/wlr_scene.c

@@ -57,10 +57,11 @@ struct wlr_scene *scene_node_get_root(struct wlr_scene_node *node) {
 
 static void scene_node_init(struct wlr_scene_node *node,
 		enum wlr_scene_node_type type, struct wlr_scene_tree *parent) {
-	memset(node, 0, sizeof(*node));
-	node->type = type;
-	node->parent = parent;
-	node->enabled = true;
+	*node = (struct wlr_scene_node){
+		.type = type,
+		.parent = parent,
+		.enabled = true,
+	};
 
 	wl_list_init(&node->link);
 
@@ -141,7 +142,7 @@ void wlr_scene_node_destroy(struct wlr_scene_node *node) {
 
 static void scene_tree_init(struct wlr_scene_tree *tree,
 		struct wlr_scene_tree *parent) {
-	memset(tree, 0, sizeof(*tree));
+	*tree = (struct wlr_scene_tree){0};
 	scene_node_init(&tree->node, WLR_SCENE_NODE_TREE, parent);
 	wl_list_init(&tree->children);
 }
@@ -386,8 +387,8 @@ static void update_node_update_outputs(struct wlr_scene_node *node,
 	}
 
 	if (old_primary_output != scene_buffer->primary_output) {
-		memset(&scene_buffer->prev_feedback_options, 0,
-			sizeof(scene_buffer->prev_feedback_options));
+		scene_buffer->prev_feedback_options =
+			(struct wlr_linux_dmabuf_feedback_v1_init_options){0};
 	}
 
 	uint64_t old_active = scene_buffer->active_outputs;

types/wlr_compositor.c

@@ -588,10 +588,10 @@ struct wlr_surface *wlr_surface_from_resource(struct wl_resource *resource) {
 }
 
 static void surface_state_init(struct wlr_surface_state *state) {
-	memset(state, 0, sizeof(*state));
-
-	state->scale = 1;
-	state->transform = WL_OUTPUT_TRANSFORM_NORMAL;
+	*state = (struct wlr_surface_state){
+		.scale = 1,
+		.transform = WL_OUTPUT_TRANSFORM_NORMAL,
+	};
 
 	wl_list_init(&state->subsurfaces_above);
 	wl_list_init(&state->subsurfaces_below);

types/wlr_cursor.c

@@ -302,7 +302,7 @@ static void get_mapping(struct wlr_cursor *cur,
 		struct wlr_input_device *dev, struct wlr_box *box) {
 	assert(cur->state->layout);
 
-	memset(box, 0, sizeof(*box));
+	*box = (struct wlr_box){0};
 
 	struct wlr_cursor_device *c_device = get_cursor_device(cur, dev);
 	if (c_device) {
@@ -1146,7 +1146,7 @@ void wlr_cursor_map_input_to_output(struct wlr_cursor *cur,
 
 void wlr_cursor_map_to_region(struct wlr_cursor *cur,
 		const struct wlr_box *box) {
-	memset(&cur->state->mapped_box, 0, sizeof(cur->state->mapped_box));
+	cur->state->mapped_box = (struct wlr_box){0};
 
 	if (box) {
 		if (wlr_box_empty(box)) {
@@ -1159,7 +1159,7 @@ void wlr_cursor_map_to_region(struct wlr_cursor *cur,
 
 void wlr_cursor_map_input_to_region(struct wlr_cursor *cur,
 		struct wlr_input_device *dev, const struct wlr_box *box) {
-	memset(&cur->state->mapped_box, 0, sizeof(cur->state->mapped_box));
+	cur->state->mapped_box = (struct wlr_box){0};
 
 	struct wlr_cursor_device *c_device = get_cursor_device(cur, dev);
 	if (!c_device) {

types/wlr_damage_ring.c

@@ -8,10 +8,10 @@
 #define WLR_DAMAGE_RING_MAX_RECTS 20
 
 void wlr_damage_ring_init(struct wlr_damage_ring *ring) {
-	memset(ring, 0, sizeof(*ring));
-
-	ring->width = INT_MAX;
-	ring->height = INT_MAX;
+	*ring = (struct wlr_damage_ring){
+		.width = INT_MAX,
+		.height = INT_MAX,
+	};
 
 	pixman_region32_init(&ring->current);
 	for (size_t i = 0; i < WLR_DAMAGE_RING_PREVIOUS_LEN; ++i) {

types/wlr_input_device.c

@@ -6,11 +6,10 @@
 
 void wlr_input_device_init(struct wlr_input_device *dev,
 		enum wlr_input_device_type type, const char *name) {
-	memset(dev, 0, sizeof(*dev));
-	dev->type = type;
-	dev->name = strdup(name);
-	dev->vendor = 0;
-	dev->product = 0;
+	*dev = (struct wlr_input_device){
+		.type = type,
+		.name = strdup(name),
+	};
 
 	wl_signal_init(&dev->events.destroy);
 }

types/wlr_keyboard.c

@@ -121,20 +121,20 @@ void wlr_keyboard_notify_key(struct wlr_keyboard *keyboard,
 
 void wlr_keyboard_init(struct wlr_keyboard *kb,
 		const struct wlr_keyboard_impl *impl, const char *name) {
-	memset(kb, 0, sizeof(*kb));
+	*kb = (struct wlr_keyboard){
+		.impl = impl,
+		.keymap_fd = -1,
+
+		// Sane defaults
+		.repeat_info.rate = 25,
+		.repeat_info.delay = 600,
+	};
 	wlr_input_device_init(&kb->base, WLR_INPUT_DEVICE_KEYBOARD, name);
 
-	kb->impl = impl;
 	wl_signal_init(&kb->events.key);
 	wl_signal_init(&kb->events.modifiers);
 	wl_signal_init(&kb->events.keymap);
 	wl_signal_init(&kb->events.repeat_info);
-
-	kb->keymap_fd = -1;
-
-	// Sane defaults
-	kb->repeat_info.rate = 25;
-	kb->repeat_info.delay = 600;
 }
 
 static void keyboard_unset_keymap(struct wlr_keyboard *kb) {

types/wlr_linux_dmabuf_v1.c

@@ -1025,7 +1025,7 @@ struct wlr_linux_dmabuf_feedback_v1_tranche *wlr_linux_dmabuf_feedback_add_tranc
 		wlr_log_errno(WLR_ERROR, "Allocation failed");
 		return NULL;
 	}
-	memset(tranche, 0, sizeof(*tranche));
+	*tranche = (struct wlr_linux_dmabuf_feedback_v1_tranche){0};
 	return tranche;
 }
 
@@ -1053,7 +1053,7 @@ bool wlr_linux_dmabuf_feedback_v1_init_with_options(struct wlr_linux_dmabuf_feed
 	assert(options->scanout_primary_output == NULL ||
 		options->output_layer_feedback_event == NULL);
 
-	memset(feedback, 0, sizeof(*feedback));
+	*feedback = (struct wlr_linux_dmabuf_feedback_v1){0};
 
 	int renderer_drm_fd = wlr_renderer_get_drm_fd(options->main_renderer);
 	if (renderer_drm_fd < 0) {

types/wlr_output_layout.c

@@ -339,7 +339,7 @@ void wlr_output_layout_closest_point(struct wlr_output_layout *layout,
 
 void wlr_output_layout_get_box(struct wlr_output_layout *layout,
 		struct wlr_output *reference, struct wlr_box *dest_box) {
-	memset(dest_box, 0, sizeof(*dest_box));
+	*dest_box = (struct wlr_box){0};
 
 	struct wlr_output_layout_output *l_output;
 	if (reference) {

types/wlr_pointer.c

@@ -15,10 +15,11 @@ struct wlr_pointer *wlr_pointer_from_input_device(
 
 void wlr_pointer_init(struct wlr_pointer *pointer,
 		const struct wlr_pointer_impl *impl, const char *name) {
-	memset(pointer, 0, sizeof(*pointer));
+	*pointer = (struct wlr_pointer){
+		.impl = impl,
+	};
 	wlr_input_device_init(&pointer->base, WLR_INPUT_DEVICE_POINTER, name);
 
-	pointer->impl = impl;
 	wl_signal_init(&pointer->events.motion);
 	wl_signal_init(&pointer->events.motion_absolute);
 	wl_signal_init(&pointer->events.button);

types/wlr_presentation_time.c

@@ -249,13 +249,14 @@ void wlr_presentation_feedback_destroy(
 
 void wlr_presentation_event_from_output(struct wlr_presentation_event *event,
 		const struct wlr_output_event_present *output_event) {
-	memset(event, 0, sizeof(*event));
-	event->output = output_event->output;
-	event->tv_sec = (uint64_t)output_event->when->tv_sec;
-	event->tv_nsec = (uint32_t)output_event->when->tv_nsec;
-	event->refresh = (uint32_t)output_event->refresh;
-	event->seq = (uint64_t)output_event->seq;
-	event->flags = output_event->flags;
+	*event = (struct wlr_presentation_event){
+		.output = output_event->output,
+		.tv_sec = (uint64_t)output_event->when->tv_sec,
+		.tv_nsec = (uint32_t)output_event->when->tv_nsec,
+		.refresh = (uint32_t)output_event->refresh,
+		.seq = (uint64_t)output_event->seq,
+		.flags = output_event->flags,
+	};
 }
 
 static void feedback_unset_output(struct wlr_presentation_feedback *feedback) {

types/wlr_primary_selection.c

@@ -7,10 +7,11 @@ void wlr_primary_selection_source_init(
 		struct wlr_primary_selection_source *source,
 		const struct wlr_primary_selection_source_impl *impl) {
 	assert(impl->send);
-	memset(source, 0, sizeof(*source));
+	*source = (struct wlr_primary_selection_source){
+		.impl = impl,
+	};
 	wl_array_init(&source->mime_types);
 	wl_signal_init(&source->events.destroy);
-	source->impl = impl;
 }
 
 void wlr_primary_selection_source_destroy(

types/wlr_switch.c

@@ -15,10 +15,11 @@ struct wlr_switch *wlr_switch_from_input_device(
 
 void wlr_switch_init(struct wlr_switch *switch_device,
 		const struct wlr_switch_impl *impl, const char *name) {
-	memset(switch_device, 0, sizeof(*switch_device));
+	*switch_device = (struct wlr_switch){
+		.impl = impl,
+	};
 	wlr_input_device_init(&switch_device->base, WLR_INPUT_DEVICE_SWITCH, name);
 
-	switch_device->impl = impl;
 	wl_signal_init(&switch_device->events.toggle);
 }
 

types/wlr_tablet_pad.c

@@ -16,10 +16,11 @@ struct wlr_tablet_pad *wlr_tablet_pad_from_input_device(
 
 void wlr_tablet_pad_init(struct wlr_tablet_pad *pad,
 		const struct wlr_tablet_pad_impl *impl, const char *name) {
-	memset(pad, 0, sizeof(*pad));
+	*pad = (struct wlr_tablet_pad){
+		.impl = impl,
+	};
 	wlr_input_device_init(&pad->base, WLR_INPUT_DEVICE_TABLET_PAD, name);
 
-	pad->impl = impl;
 	wl_signal_init(&pad->events.button);
 	wl_signal_init(&pad->events.ring);
 	wl_signal_init(&pad->events.strip);

types/wlr_tablet_tool.c

@@ -15,10 +15,11 @@ struct wlr_tablet *wlr_tablet_from_input_device(
 
 void wlr_tablet_init(struct wlr_tablet *tablet,
 		const struct wlr_tablet_impl *impl, const char *name) {
-	memset(tablet, 0, sizeof(*tablet));
+	*tablet = (struct wlr_tablet){
+		.impl = impl,
+	};
 	wlr_input_device_init(&tablet->base, WLR_INPUT_DEVICE_TABLET_TOOL, name);
 
-	tablet->impl = impl;
 	wl_signal_init(&tablet->events.axis);
 	wl_signal_init(&tablet->events.proximity);
 	wl_signal_init(&tablet->events.tip);

types/wlr_touch.c

@@ -15,10 +15,11 @@ struct wlr_touch *wlr_touch_from_input_device(
 
 void wlr_touch_init(struct wlr_touch *touch,
 		const struct wlr_touch_impl *impl, const char *name) {
-	memset(touch, 0, sizeof(*touch));
+	*touch = (struct wlr_touch){
+		.impl = impl,
+	};
 	wlr_input_device_init(&touch->base, WLR_INPUT_DEVICE_TOUCH, name);
 
-	touch->impl = impl;
 	wl_signal_init(&touch->events.down);
 	wl_signal_init(&touch->events.up);
 	wl_signal_init(&touch->events.motion);

types/wlr_virtual_pointer_v1.c

@@ -113,7 +113,7 @@ static void virtual_pointer_frame(struct wl_client *client,
 			/* Deliver pending axis event */
 			wl_signal_emit_mutable(&pointer->pointer.events.axis,
 					&pointer->axis_event[i]);
-			memset(&pointer->axis_event[i], 0, sizeof(pointer->axis_event[i]));
+			pointer->axis_event[i] = (struct wlr_pointer_axis_event){0};
 			pointer->axis_valid[i] = false;
 		}
 	}

util/addon.c

@@ -6,7 +6,7 @@
 #include <wlr/util/log.h>
 
 void wlr_addon_set_init(struct wlr_addon_set *set) {
-	memset(set, 0, sizeof(*set));
+	*set = (struct wlr_addon_set){0};
 	wl_list_init(&set->addons);
 }
 
@@ -26,7 +26,10 @@ void wlr_addon_set_finish(struct wlr_addon_set *set) {
 void wlr_addon_init(struct wlr_addon *addon, struct wlr_addon_set *set,
 		const void *owner, const struct wlr_addon_interface *impl) {
 	assert(impl);
-	memset(addon, 0, sizeof(*addon));
+	*addon = (struct wlr_addon){
+		.impl = impl,
+		.owner = owner,
+	};
 	struct wlr_addon *iter;
 	wl_list_for_each(iter, &set->addons, link) {
 		if (iter->owner == addon->owner && iter->impl == addon->impl) {
@@ -34,8 +37,6 @@ void wlr_addon_init(struct wlr_addon *addon, struct wlr_addon_set *set,
 		}
 	}
 	wl_list_insert(&set->addons, &addon->link);
-	addon->owner = owner;
-	addon->impl = impl;
 }
 
 void wlr_addon_finish(struct wlr_addon *addon) {

xwayland/selection/selection.c

@@ -34,9 +34,10 @@ void xwm_selection_transfer_destroy_property_reply(
 
 void xwm_selection_transfer_init(struct wlr_xwm_selection_transfer *transfer,
 		struct wlr_xwm_selection *selection) {
-	memset(transfer, 0, sizeof(*transfer));
-	transfer->selection = selection;
-	transfer->wl_client_fd = -1;
+	*transfer = (struct wlr_xwm_selection_transfer){
+		.selection = selection,
+		.wl_client_fd = -1,
+	};
 }
 
 void xwm_selection_transfer_destroy(
@@ -175,14 +176,14 @@ int xwm_handle_selection_event(struct wlr_xwm *xwm,
 
 void xwm_selection_init(struct wlr_xwm_selection *selection,
 		struct wlr_xwm *xwm, xcb_atom_t atom) {
-	memset(selection, 0, sizeof(*selection));
+	*selection = (struct wlr_xwm_selection){
+		.xwm = xwm,
+		.atom = atom,
+		.window = xcb_generate_id(xwm->xcb_conn),
+	};
 	wl_list_init(&selection->incoming);
 	wl_list_init(&selection->outgoing);
 
-	selection->xwm = xwm;
-	selection->atom = atom;
-	selection->window = xcb_generate_id(xwm->xcb_conn);
-
 	if (atom == xwm->atoms[DND_SELECTION]) {
 		xcb_create_window(
 			xwm->xcb_conn,