Zero-initialize structs in init functions

Ensures there is no field left to its previous undefined value after
calling an init function.

backend/backend.c

@@ -36,7 +36,7 @@
 
 void wlr_backend_init(struct wlr_backend *backend,
 		const struct wlr_backend_impl *impl) {
-	assert(backend);
+	memset(backend, 0, sizeof(*backend));
 	backend->impl = impl;
 	wl_signal_init(&backend->events.destroy);
 	wl_signal_init(&backend->events.new_input);

backend/drm/drm.c

@@ -380,6 +380,7 @@ static bool drm_crtc_page_flip(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->committed &
 		(WLR_OUTPUT_STATE_ENABLED | WLR_OUTPUT_STATE_MODE);

render/allocator/allocator.c

@@ -18,6 +18,7 @@
 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;
 	wl_signal_init(&alloc->events.destroy);

render/wlr_renderer.c

@@ -39,6 +39,8 @@ void wlr_renderer_init(struct wlr_renderer *renderer,
 	assert(impl->render_quad_with_matrix);
 	assert(impl->get_shm_texture_formats);
 	assert(impl->get_render_buffer_caps);
+
+	memset(renderer, 0, sizeof(*renderer));
 	renderer->impl = impl;
 
 	wl_signal_init(&renderer->events.destroy);

render/wlr_texture.c

@@ -1,12 +1,14 @@
 #include <assert.h>
 #include <stdbool.h>
 #include <stdlib.h>
+#include <string.h>
 #include <wlr/render/interface.h>
 #include <wlr/render/wlr_texture.h>
 #include "types/wlr_buffer.h"
 
 void wlr_texture_init(struct wlr_texture *texture,
 		const struct wlr_texture_impl *impl, uint32_t width, uint32_t height) {
+	memset(texture, 0, sizeof(*texture));
 	texture->impl = impl;
 	texture->width = width;
 	texture->height = height;

types/data_device/wlr_data_source.c

@@ -15,6 +15,7 @@ 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;
 	wl_array_init(&source->mime_types);
 	wl_signal_init(&source->events.destroy);

types/output/output.c

@@ -377,6 +377,8 @@ void wlr_output_init(struct wlr_output *output, struct wlr_backend *backend,
 	if (impl->set_cursor || impl->move_cursor) {
 		assert(impl->set_cursor && impl->move_cursor);
 	}
+
+	memset(output, 0, sizeof(*output));
 	output->backend = backend;
 	output->impl = impl;
 	output->display = display;

types/scene/wlr_scene.c

@@ -48,6 +48,7 @@ static struct wlr_scene *scene_node_get_root(struct wlr_scene_node *node) {
 }
 
 static void scene_node_state_init(struct wlr_scene_node_state *state) {
+	memset(state, 0, sizeof(*state));
 	wl_list_init(&state->children);
 	wl_list_init(&state->link);
 	state->enabled = true;
@@ -61,6 +62,7 @@ static void scene_node_init(struct wlr_scene_node *node,
 		enum wlr_scene_node_type type, struct wlr_scene_node *parent) {
 	assert(type == WLR_SCENE_NODE_ROOT || parent != NULL);
 
+	memset(node, 0, sizeof(*node));
 	node->type = type;
 	node->parent = parent;
 	scene_node_state_init(&node->state);

types/wlr_buffer.c

@@ -17,6 +17,8 @@ void wlr_buffer_init(struct wlr_buffer *buffer,
 	if (impl->begin_data_ptr_access || impl->end_data_ptr_access) {
 		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;

types/wlr_compositor.c

@@ -583,6 +583,8 @@ 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;
 

types/wlr_input_device.c

@@ -7,6 +7,7 @@
 
 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;

types/wlr_keyboard.c

@@ -116,6 +116,7 @@ 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));
 	wlr_input_device_init(&kb->base, WLR_INPUT_DEVICE_KEYBOARD, name);
 	kb->base.keyboard = kb;
 

types/wlr_pointer.c

@@ -8,6 +8,7 @@
 
 void wlr_pointer_init(struct wlr_pointer *pointer,
 		const struct wlr_pointer_impl *impl, const char *name) {
+	memset(pointer, 0, sizeof(*pointer));
 	wlr_input_device_init(&pointer->base, WLR_INPUT_DEVICE_POINTER, name);
 	pointer->base.pointer = pointer;
 

types/wlr_primary_selection.c

@@ -8,6 +8,7 @@ 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));
 	wl_array_init(&source->mime_types);
 	wl_signal_init(&source->events.destroy);
 	source->impl = impl;

types/wlr_switch.c

@@ -8,6 +8,7 @@
 
 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));
 	wlr_input_device_init(&switch_device->base, WLR_INPUT_DEVICE_SWITCH, name);
 	switch_device->base.switch_device = switch_device;
 

types/wlr_tablet_pad.c

@@ -9,6 +9,7 @@
 
 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));
 	wlr_input_device_init(&pad->base, WLR_INPUT_DEVICE_TABLET_PAD, name);
 	pad->base.tablet_pad = pad;
 

types/wlr_tablet_tool.c

@@ -8,6 +8,7 @@
 
 void wlr_tablet_init(struct wlr_tablet *tablet,
 		const struct wlr_tablet_impl *impl, const char *name) {
+	memset(tablet, 0, sizeof(*tablet));
 	wlr_input_device_init(&tablet->base, WLR_INPUT_DEVICE_TABLET_TOOL, name);
 	tablet->base.tablet = tablet;
 

types/wlr_touch.c

@@ -8,6 +8,7 @@
 
 void wlr_touch_init(struct wlr_touch *touch,
 		const struct wlr_touch_impl *impl, const char *name) {
+	memset(touch, 0, sizeof(*touch));
 	wlr_input_device_init(&touch->base, WLR_INPUT_DEVICE_TOUCH, name);
 	touch->base.touch = touch;
 

util/addon.c

@@ -1,9 +1,11 @@
 #include <assert.h>
 #include <stdlib.h>
+#include <string.h>
 #include <wayland-server-core.h>
 #include <wlr/util/addon.h>
 
 void wlr_addon_set_init(struct wlr_addon_set *set) {
+	memset(set, 0, sizeof(*set));
 	wl_list_init(&set->addons);
 }
 
@@ -18,6 +20,7 @@ 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(owner && impl);
+	memset(addon, 0, sizeof(*addon));
 	struct wlr_addon *iter;
 	wl_list_for_each(iter, &set->addons, link) {
 		if (iter->owner == addon->owner && iter->impl == addon->impl) {

xwayland/selection/selection.c

@@ -34,6 +34,7 @@ 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;
 }
@@ -174,6 +175,7 @@ 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));
 	wl_list_init(&selection->incoming);
 	wl_list_init(&selection->outgoing);