text: #ifndef _POSIX_C_SOURCE
  #define _POSIX_C_SOURCE 200809L
  #endif
  #include <assert.h>
  #include <stdlib.h>
  #include <stddef.h>
  #include <wlr/types/wlr_text_input_v3.h>
  #include <wlr/util/log.h>
  #include "text-input-unstable-v3-protocol.h"
  #include "util/signal.h"
  
  static void text_input_clear_focused_surface(struct wlr_text_input_v3 *text_input) {
  	wl_list_remove(&text_input->surface_destroy.link);
  	wl_list_init(&text_input->surface_destroy.link);
  	text_input->focused_surface = NULL;
  }
  
  static const struct zwp_text_input_v3_interface text_input_impl;
  
  static struct wlr_text_input_v3 *text_input_from_resource(
  		struct wl_resource *resource) {
  	assert(wl_resource_instance_of(resource, &zwp_text_input_v3_interface,
  		&text_input_impl));
  	return wl_resource_get_user_data(resource);
  }
  
  void wlr_text_input_v3_send_enter(struct wlr_text_input_v3 *text_input,
  		struct wlr_surface *surface) {
  	assert(wl_resource_get_client(text_input->resource)
  		== wl_resource_get_client(surface->resource));
  	text_input->focused_surface = surface;
  	wl_signal_add(&text_input->focused_surface->events.destroy,
  		&text_input->surface_destroy);
  	zwp_text_input_v3_send_enter(text_input->resource,
  		text_input->focused_surface->resource);
  }
  
  void wlr_text_input_v3_send_leave(struct wlr_text_input_v3 *text_input) {
  	zwp_text_input_v3_send_leave(text_input->resource,
  		text_input->focused_surface->resource);
  	text_input_clear_focused_surface(text_input);
  }
  
  void wlr_text_input_v3_send_preedit_string(struct wlr_text_input_v3 *text_input,
  		const char *text, uint32_t cursor_begin, uint32_t cursor_end) {
  	zwp_text_input_v3_send_preedit_string(text_input->resource, text,
  		cursor_begin, cursor_end);
  }
  
  void wlr_text_input_v3_send_commit_string(struct wlr_text_input_v3 *text_input,
  		const char *text) {
  	zwp_text_input_v3_send_commit_string(text_input->resource, text);
  }
  
  void wlr_text_input_v3_send_delete_surrounding_text(
  		struct wlr_text_input_v3 *text_input, uint32_t before_length,
  		uint32_t after_length) {
  	zwp_text_input_v3_send_delete_surrounding_text(text_input->resource,
  		before_length, after_length);
  }
  
  void wlr_text_input_v3_send_done(struct wlr_text_input_v3 *text_input) {
  	zwp_text_input_v3_send_done(text_input->resource,
  		text_input->current_serial);
  }
  
  static void wlr_text_input_destroy(struct wlr_text_input_v3 *text_input) {
  	wlr_signal_emit_safe(&text_input->events.destroy, text_input);
  	text_input_clear_focused_surface(text_input);
  	wl_list_remove(&text_input->seat_destroy.link);
  	// remove from manager::text_inputs
  	wl_list_remove(&text_input->link);
  	free(text_input->current.surrounding.text);
  	free(text_input->pending.surrounding.text);
  	free(text_input);
  }
  
  static void text_input_resource_destroy(struct wl_resource *resource) {
  	struct wlr_text_input_v3 *text_input = text_input_from_resource(resource);
  	if (!text_input) {
  		return;
  	}
  	wlr_text_input_destroy(text_input);
  }
  
  static void text_input_destroy(struct wl_client *client,
  		struct wl_resource *resource) {
  	wl_resource_destroy(resource);
  }
  
  static void text_input_enable(struct wl_client *client,
  		struct wl_resource *resource) {
  	struct wlr_text_input_v3 *text_input = text_input_from_resource(resource);
  	if (!text_input) {
  		return;
  	}
  	struct wlr_text_input_v3_state defaults = {0};
  	free(text_input->pending.surrounding.text);
  	text_input->pending = defaults;
  	text_input->pending_enabled = true;
  }
  
  static void text_input_disable(struct wl_client *client,
  		struct wl_resource *resource) {
  	struct wlr_text_input_v3 *text_input = text_input_from_resource(resource);
  	if (!text_input) {
  		return;
  	}
  	text_input->pending_enabled = false;
  }
  
  static void text_input_set_surrounding_text(struct wl_client *client,
  		struct wl_resource *resource, const char *text, int32_t cursor,
  		int32_t anchor) {
  	struct wlr_text_input_v3 *text_input = text_input_from_resource(resource);
  	if (!text_input) {
  		return;
  	}
  	free(text_input->pending.surrounding.text);
  	text_input->pending.surrounding.text = strdup(text);
  	if (!text_input->pending.surrounding.text) {
  		wl_client_post_no_memory(client);
  	}
  
  	text_input->pending.surrounding.cursor = cursor;
  	text_input->pending.surrounding.anchor = anchor;
  }
  
  static void text_input_set_text_change_cause(struct wl_client *client,
  		struct wl_resource *resource, uint32_t cause) {
  	struct wlr_text_input_v3 *text_input = text_input_from_resource(resource);
  	if (!text_input) {
  		return;
  	}
  	text_input->pending.text_change_cause = cause;
  }
  
  static void text_input_set_content_type(struct wl_client *client,
  		struct wl_resource *resource, uint32_t hint, uint32_t purpose) {
  	struct wlr_text_input_v3 *text_input = text_input_from_resource(resource);
  	if (!text_input) {
  		return;
  	}
  	text_input->pending.content_type.hint = hint;
  	text_input->pending.content_type.purpose = purpose;
  }
  
  static void text_input_set_cursor_rectangle(struct wl_client *client,
  		struct wl_resource *resource, int32_t x, int32_t y, int32_t width,
  		int32_t height) {
  	struct wlr_text_input_v3 *text_input = text_input_from_resource(resource);
  	if (!text_input) {
  		return;
  	}
  	text_input->pending.cursor_rectangle.x = x;
  	text_input->pending.cursor_rectangle.y = y;
  	text_input->pending.cursor_rectangle.width = width;
  	text_input->pending.cursor_rectangle.height = height;
  }
  
  static void text_input_commit(struct wl_client *client,
  		struct wl_resource *resource) {
  	struct wlr_text_input_v3 *text_input = text_input_from_resource(resource);
  	if (!text_input) {
  		return;
  	}
  	free(text_input->current.surrounding.text);
  	text_input->current = text_input->pending;
  	if (text_input->pending.surrounding.text) {
  		text_input->current.surrounding.text =
  			strdup(text_input->pending.surrounding.text);
  	}
  
  	bool old_enabled = text_input->current_enabled;
  	text_input->current_enabled = text_input->pending_enabled;
  	text_input->current_serial++;
  
  	if (text_input->focused_surface == NULL) {
  		wlr_log(WLR_DEBUG, "Text input commit received without focus");
  	}
  
  	if (!old_enabled && text_input->current_enabled) {
  		wlr_signal_emit_safe(&text_input->events.enable, text_input);
  	} else if (old_enabled && !text_input->current_enabled) {
  		wlr_signal_emit_safe(&text_input->events.disable, text_input);
  	} else { // including never enabled
  		wlr_signal_emit_safe(&text_input->events.commit, text_input);
  	}
  }
  
  static const struct zwp_text_input_v3_interface text_input_impl = {
  	.destroy = text_input_destroy,
  	.enable = text_input_enable,
  	.disable = text_input_disable,
  	.set_surrounding_text = text_input_set_surrounding_text,
  	.set_text_change_cause = text_input_set_text_change_cause,
  	.set_content_type = text_input_set_content_type,
  	.set_cursor_rectangle = text_input_set_cursor_rectangle,
  	.commit = text_input_commit,
  };
  
  static const struct zwp_text_input_manager_v3_interface text_input_manager_impl;
  
  static struct wlr_text_input_manager_v3 *text_input_manager_from_resource(
  		struct wl_resource *resource) {
  	assert(wl_resource_instance_of(resource,
  		&zwp_text_input_manager_v3_interface, &text_input_manager_impl));
  	return wl_resource_get_user_data(resource);
  }
  
  static void text_input_manager_destroy(struct wl_client *client,
  		struct wl_resource *resource) {
  	wl_resource_destroy(resource);
  }
  
  static void text_input_handle_seat_destroy(struct wl_listener *listener,
  		void *data) {
  	struct wlr_text_input_v3 *text_input = wl_container_of(listener, text_input,
  		seat_destroy);
  	struct wl_resource *resource = text_input->resource;
  	wlr_text_input_destroy(text_input);
  	wl_resource_set_user_data(resource, NULL);
  }
  
  static void text_input_handle_focused_surface_destroy(
  		struct wl_listener *listener, void *data) {
  	struct wlr_text_input_v3 *text_input = wl_container_of(listener, text_input,
  		surface_destroy);
  	text_input_clear_focused_surface(text_input);
  }
  
  static void text_input_manager_get_text_input(struct wl_client *client,
  		struct wl_resource *resource, uint32_t id, struct wl_resource *seat) {
  	struct wlr_text_input_v3 *text_input =
  		calloc(1, sizeof(struct wlr_text_input_v3));
  	if (text_input == NULL) {
  		wl_client_post_no_memory(client);
  		return;
  	}
  
  	wl_signal_init(&text_input->events.enable);
  	wl_signal_init(&text_input->events.commit);
  	wl_signal_init(&text_input->events.disable);
  	wl_signal_init(&text_input->events.destroy);
  
  	int version = wl_resource_get_version(resource);
  	struct wl_resource *text_input_resource = wl_resource_create(client,
  		&zwp_text_input_v3_interface, version, id);
  	if (text_input_resource == NULL) {
  		free(text_input);
  		wl_client_post_no_memory(client);
  		return;
  	}
  	text_input->resource = text_input_resource;
  
  	wl_resource_set_implementation(text_input->resource, &text_input_impl,
  		text_input, text_input_resource_destroy);
  
  	struct wlr_seat_client *seat_client = wlr_seat_client_from_resource(seat);
  	struct wlr_seat *wlr_seat = seat_client->seat;
  	text_input->seat = wlr_seat;
  	wl_signal_add(&seat_client->events.destroy,
  		&text_input->seat_destroy);
  	text_input->seat_destroy.notify =
  		text_input_handle_seat_destroy;
  	text_input->surface_destroy.notify =
  		text_input_handle_focused_surface_destroy;
  	wl_list_init(&text_input->surface_destroy.link);
  
  	struct wlr_text_input_manager_v3 *manager =
  		text_input_manager_from_resource(resource);
  	wl_list_insert(&manager->text_inputs, &text_input->link);
  
  	wlr_signal_emit_safe(&manager->events.text_input, text_input);
  }
  
  static const struct zwp_text_input_manager_v3_interface
  		text_input_manager_impl = {
  	.destroy = text_input_manager_destroy,
  	.get_text_input = text_input_manager_get_text_input,
  };
  
  static void text_input_manager_bind(struct wl_client *wl_client, void *data,
  		uint32_t version, uint32_t id) {
  	struct wlr_text_input_manager_v3 *manager = data;
  	assert(wl_client && manager);
  
  	struct wl_resource *resource = wl_resource_create(wl_client,
  		&zwp_text_input_manager_v3_interface, version, id);
  	if (resource == NULL) {
  		wl_client_post_no_memory(wl_client);
  		return;
  	}
  	wl_resource_set_implementation(resource, &text_input_manager_impl,
  		manager, NULL);
  }
  
  static void handle_display_destroy(struct wl_listener *listener, void *data) {
  	struct wlr_text_input_manager_v3 *manager =
  		wl_container_of(listener, manager, display_destroy);
  	wlr_signal_emit_safe(&manager->events.destroy, manager);
  	wl_list_remove(&manager->display_destroy.link);
  	wl_global_destroy(manager->global);
  	free(manager);
  }
  
  struct wlr_text_input_manager_v3 *wlr_text_input_manager_v3_create(
  		struct wl_display *display) {
  	struct wlr_text_input_manager_v3 *manager =
  		calloc(1, sizeof(struct wlr_text_input_manager_v3));
  	if (!manager) {
  		return NULL;
  	}
  
  	wl_list_init(&manager->text_inputs);
  	wl_signal_init(&manager->events.text_input);
  
  	manager->global = wl_global_create(display,
  		&zwp_text_input_manager_v3_interface, 1, manager,
  		text_input_manager_bind);
  	if (!manager->global) {
  		free(manager);
  		return NULL;
  	}
  
  	manager->display_destroy.notify = handle_display_destroy;
  	wl_display_add_destroy_listener(display, &manager->display_destroy);
  
  	return manager;
  }
  