text: #define _POSIX_C_SOURCE 200112L
  #include <assert.h>
  #include <stdlib.h>
  #include <time.h>
  #include <wayland-server.h>
  #include <wlr/backend/libinput.h>
  #include <wlr/config.h>
  #include <wlr/types/wlr_cursor.h>
  #include <wlr/util/log.h>
  #include <wlr/xcursor.h>
  #ifdef WLR_HAS_XWAYLAND
  #include <wlr/xwayland.h>
  #endif
  #include "rootston/config.h"
  #include "rootston/input.h"
  #include "rootston/keyboard.h"
  #include "rootston/seat.h"
  #include "rootston/server.h"
  
  static const char *device_type(enum wlr_input_device_type type) {
  	switch (type) {
  	case WLR_INPUT_DEVICE_KEYBOARD:
  		return "keyboard";
  	case WLR_INPUT_DEVICE_POINTER:
  		return "pointer";
  	case WLR_INPUT_DEVICE_TOUCH:
  		return "touch";
  	case WLR_INPUT_DEVICE_TABLET_TOOL:
  		return "tablet tool";
  	case WLR_INPUT_DEVICE_TABLET_PAD:
  		return "tablet pad";
  	}
  	return NULL;
  }
  
  struct roots_seat *input_get_seat(struct roots_input *input, char *name) {
  	struct roots_seat *seat = NULL;
  	wl_list_for_each(seat, &input->seats, link) {
  		if (strcmp(seat->seat->name, name) == 0) {
  			return seat;
  		}
  	}
  
  	seat = roots_seat_create(input, name);
  	return seat;
  }
  
  static void handle_new_input(struct wl_listener *listener, void *data) {
  	struct wlr_input_device *device = data;
  	struct roots_input *input = wl_container_of(listener, input, new_input);
  
  	char *seat_name = ROOTS_CONFIG_DEFAULT_SEAT_NAME;
  	struct roots_device_config *dc =
  		roots_config_get_device(input->config, device);
  	if (dc) {
  		seat_name = dc->seat;
  	}
  
  	struct roots_seat *seat = input_get_seat(input, seat_name);
  	if (!seat) {
  		wlr_log(WLR_ERROR, "could not create roots seat");
  		return;
  	}
  
  	wlr_log(WLR_DEBUG, "New input device: %s (%d:%d) %s seat:%s", device->name,
  			device->vendor, device->product, device_type(device->type), seat_name);
  
  	roots_seat_add_device(seat, device);
  
  	if (dc && wlr_input_device_is_libinput(device)) {
  		struct libinput_device *libinput_dev =
  			wlr_libinput_get_device_handle(device);
  
  		wlr_log(WLR_DEBUG, "input has config, tap_enabled: %d\n", dc->tap_enabled);
  		if (dc->tap_enabled) {
  			libinput_device_config_tap_set_enabled(libinput_dev,
  					LIBINPUT_CONFIG_TAP_ENABLED);
  		}
  	}
  }
  
  struct roots_input *input_create(struct roots_server *server,
  		struct roots_config *config) {
  	wlr_log(WLR_DEBUG, "Initializing roots input");
  	assert(server->desktop);
  
  	struct roots_input *input = calloc(1, sizeof(struct roots_input));
  	if (input == NULL) {
  		return NULL;
  	}
  
  	input->config = config;
  	input->server = server;
  
  	wl_list_init(&input->seats);
  
  	input->new_input.notify = handle_new_input;
  	wl_signal_add(&server->backend->events.new_input, &input->new_input);
  
  	return input;
  }
  
  void input_destroy(struct roots_input *input) {
  	// TODO
  }
  
  struct roots_seat *input_seat_from_wlr_seat(struct roots_input *input,
  		struct wlr_seat *wlr_seat) {
  	struct roots_seat *seat = NULL;
  	wl_list_for_each(seat, &input->seats, link) {
  		if (seat->seat == wlr_seat) {
  			return seat;
  		}
  	}
  	return seat;
  }
  
  bool input_view_has_focus(struct roots_input *input, struct roots_view *view) {
  	if (!view) {
  		return false;
  	}
  	struct roots_seat *seat;
  	wl_list_for_each(seat, &input->seats, link) {
  		if (view == roots_seat_get_focus(seat)) {
  			return true;
  		}
  	}
  
  	return false;
  }
  
  static inline int64_t timespec_to_msec(const struct timespec *a) {
  	return (int64_t)a->tv_sec * 1000 + a->tv_nsec / 1000000;
  }
  
  void input_update_cursor_focus(struct roots_input *input) {
  	struct roots_seat *seat;
  	struct timespec now;
  	wl_list_for_each(seat, &input->seats, link) {
  		clock_gettime(CLOCK_MONOTONIC, &now);
  		roots_cursor_update_position(seat->cursor, timespec_to_msec(&now));
  	}
  }
  