4 * i3 - an improved dynamic tiling window manager
6 * © 2009 Michael Stapelberg and contributors
8 * See file LICENSE for license information.
10 * util.c: Utility functions, which can be useful everywhere.
21 #if defined(__OpenBSD__)
22 #include <sys/cdefs.h>
25 #include <xcb/xcb_icccm.h>
38 static iconv_t conversion_descriptor = 0;
39 struct keyvalue_table_head by_parent = TAILQ_HEAD_INITIALIZER(by_parent);
40 struct keyvalue_table_head by_child = TAILQ_HEAD_INITIALIZER(by_child);
42 int min(int a, int b) {
43 return (a < b ? a : b);
46 int max(int a, int b) {
47 return (a > b ? a : b);
51 * Updates *destination with new_value and returns true if it was changed or false
55 bool update_if_necessary(uint32_t *destination, const uint32_t new_value) {
56 uint32_t old_value = *destination;
58 return ((*destination = new_value) != old_value);
62 * The s* functions (safe) are wrappers around malloc, strdup, …, which exits if one of
63 * the called functions returns NULL, meaning that there is no more memory available
66 void *smalloc(size_t size) {
67 void *result = malloc(size);
68 exit_if_null(result, "Error: out of memory (malloc(%zd))\n", size);
72 void *scalloc(size_t size) {
73 void *result = calloc(size, 1);
74 exit_if_null(result, "Error: out of memory (calloc(%zd))\n", size);
78 char *sstrdup(const char *str) {
79 char *result = strdup(str);
80 exit_if_null(result, "Error: out of memory (strdup())\n");
85 * The table_* functions emulate the behaviour of libxcb-wm, which in libxcb 0.3.4 suddenly
89 bool table_put(struct keyvalue_table_head *head, uint32_t key, void *value) {
90 struct keyvalue_element *element = scalloc(sizeof(struct keyvalue_element));
92 element->value = value;
94 TAILQ_INSERT_TAIL(head, element, elements);
98 void *table_remove(struct keyvalue_table_head *head, uint32_t key) {
99 struct keyvalue_element *element;
101 TAILQ_FOREACH(element, head, elements)
102 if (element->key == key) {
103 void *value = element->value;
104 TAILQ_REMOVE(head, element, elements);
112 void *table_get(struct keyvalue_table_head *head, uint32_t key) {
113 struct keyvalue_element *element;
115 TAILQ_FOREACH(element, head, elements)
116 if (element->key == key)
117 return element->value;
123 * Starts the given application by passing it through a shell. We use double fork
124 * to avoid zombie processes. As the started application’s parent exits (immediately),
125 * the application is reparented to init (process-id 1), which correctly handles
126 * childs, so we don’t have to do it :-).
128 * The shell is determined by looking for the SHELL environment variable. If it
129 * does not exist, /bin/sh is used.
132 void start_application(const char *command) {
136 /* Stores the path of the shell */
137 static const char *shell = NULL;
140 if ((shell = getenv("SHELL")) == NULL)
143 /* This is the child */
144 execl(shell, shell, "-c", command, (void*)NULL);
153 * Checks a generic cookie for errors and quits with the given message if there
157 void check_error(xcb_connection_t *conn, xcb_void_cookie_t cookie, char *err_message) {
158 xcb_generic_error_t *error = xcb_request_check(conn, cookie);
160 fprintf(stderr, "ERROR: %s (X error %d)\n", err_message , error->error_code);
161 xcb_disconnect(conn);
167 * Converts the given string to UCS-2 big endian for use with
168 * xcb_image_text_16(). The amount of real glyphs is stored in real_strlen,
169 * a buffer containing the UCS-2 encoded string (16 bit per glyph) is
170 * returned. It has to be freed when done.
173 char *convert_utf8_to_ucs2(char *input, int *real_strlen) {
174 size_t input_size = strlen(input) + 1;
175 /* UCS-2 consumes exactly two bytes for each glyph */
176 int buffer_size = input_size * 2;
178 char *buffer = smalloc(buffer_size);
179 size_t output_size = buffer_size;
180 /* We need to use an additional pointer, because iconv() modifies it */
181 char *output = buffer;
183 /* We convert the input into UCS-2 big endian */
184 if (conversion_descriptor == 0) {
185 conversion_descriptor = iconv_open("UCS-2BE", "UTF-8");
186 if (conversion_descriptor == 0) {
187 fprintf(stderr, "error opening the conversion context\n");
192 /* Get the conversion descriptor back to original state */
193 iconv(conversion_descriptor, NULL, NULL, NULL, NULL);
195 /* Convert our text */
196 int rc = iconv(conversion_descriptor, (void*)&input, &input_size, &output, &output_size);
197 if (rc == (size_t)-1) {
198 perror("Converting to UCS-2 failed");
199 if (real_strlen != NULL)
204 if (real_strlen != NULL)
205 *real_strlen = ((buffer_size - output_size) / 2) - 1;
211 * Returns the client which comes next in focus stack (= was selected before) for
212 * the given container, optionally excluding the given client.
215 Client *get_last_focused_client(xcb_connection_t *conn, Container *container, Client *exclude) {
217 SLIST_FOREACH(current, &(container->workspace->focus_stack), focus_clients)
218 if ((current->container == container) && ((exclude == NULL) || (current != exclude)))
225 * Sets the given client as focused by updating the data structures correctly,
226 * updating the X input focus and finally re-decorating both windows (to signalize
227 * the user the new focus situation)
230 void set_focus(xcb_connection_t *conn, Client *client, bool set_anyways) {
231 /* The dock window cannot be focused, but enter notifies are still handled correctly */
235 /* Store the old client */
236 Client *old_client = SLIST_FIRST(&(c_ws->focus_stack));
238 /* Check if the focus needs to be changed at all */
239 if (!set_anyways && (old_client == client))
242 /* Store current_row/current_col */
243 c_ws->current_row = current_row;
244 c_ws->current_col = current_col;
245 c_ws = client->workspace;
246 ewmh_update_current_desktop();
247 /* Load current_col/current_row if we switch to a client without a container */
248 current_col = c_ws->current_col;
249 current_row = c_ws->current_row;
251 /* Update container */
252 if (client->container != NULL) {
253 client->container->currently_focused = client;
255 current_col = client->container->col;
256 current_row = client->container->row;
260 /* Set focus to the entered window, and flush xcb buffer immediately */
261 xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, client->child, XCB_CURRENT_TIME);
262 ewmh_update_active_window(client->child);
263 //xcb_warp_pointer(conn, XCB_NONE, client->child, 0, 0, 0, 0, 10, 10);
265 if (client->container != NULL) {
266 /* Get the client which was last focused in this particular container, it may be a different
267 one than old_client */
268 Client *last_focused = get_last_focused_client(conn, client->container, NULL);
270 /* In stacking containers, raise the client in respect to the one which was focused before */
271 if ((client->container->mode == MODE_STACK || client->container->mode == MODE_TABBED) &&
272 client->container->workspace->fullscreen_client == NULL) {
273 /* We need to get the client again, this time excluding the current client, because
274 * we might have just gone into stacking mode and need to raise */
275 Client *last_focused = get_last_focused_client(conn, client->container, client);
277 if (last_focused != NULL) {
278 DLOG("raising above frame %p / child %p\n", last_focused->frame, last_focused->child);
279 uint32_t values[] = { last_focused->frame, XCB_STACK_MODE_ABOVE };
280 xcb_configure_window(conn, client->frame, XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE, values);
284 /* If it is the same one as old_client, we save us the unnecessary redecorate */
285 if ((last_focused != NULL) && (last_focused != old_client))
286 redecorate_window(conn, last_focused);
289 /* If the last client was a floating client, we need to go to the next
290 * tiling client in stack and re-decorate it. */
291 if (old_client != NULL && client_is_floating(old_client)) {
292 DLOG("Coming from floating client, searching next tiling...\n");
294 SLIST_FOREACH(current, &(client->workspace->focus_stack), focus_clients) {
295 if (client_is_floating(current))
298 DLOG("Found window: %p / child %p\n", current->frame, current->child);
299 redecorate_window(conn, current);
305 SLIST_REMOVE(&(client->workspace->focus_stack), client, Client, focus_clients);
306 SLIST_INSERT_HEAD(&(client->workspace->focus_stack), client, focus_clients);
308 /* If we’re in stacking mode, this renders the container to update changes in the title
309 bars and to raise the focused client */
310 if ((old_client != NULL) && (old_client != client) && !old_client->dock)
311 redecorate_window(conn, old_client);
313 /* redecorate_window flushes, so we don’t need to */
314 redecorate_window(conn, client);
318 * Called when the user switches to another mode or when the container is
319 * destroyed and thus needs to be cleaned up.
322 void leave_stack_mode(xcb_connection_t *conn, Container *container) {
323 /* When going out of stacking mode, we need to close the window */
324 struct Stack_Window *stack_win = &(container->stack_win);
326 SLIST_REMOVE(&stack_wins, stack_win, Stack_Window, stack_windows);
328 xcb_free_gc(conn, stack_win->pixmap.gc);
329 xcb_free_pixmap(conn, stack_win->pixmap.id);
330 xcb_destroy_window(conn, stack_win->window);
332 stack_win->rect.width = -1;
333 stack_win->rect.height = -1;
337 * Switches the layout of the given container taking care of the necessary house-keeping
340 void switch_layout_mode(xcb_connection_t *conn, Container *container, int mode) {
341 if (mode == MODE_STACK || mode == MODE_TABBED) {
342 /* When we’re already in stacking mode, nothing has to be done */
343 if ((mode == MODE_STACK && container->mode == MODE_STACK) ||
344 (mode == MODE_TABBED && container->mode == MODE_TABBED))
347 if (container->mode == MODE_STACK || container->mode == MODE_TABBED)
350 /* When entering stacking mode, we need to open a window on
351 * which we can draw the title bars of the clients, it has
352 * height 1 because we don’t bother here with calculating the
353 * correct height - it will be adjusted when rendering anyways.
354 * Also, we need to use max(width, 1) because windows cannot
355 * be created with either width == 0 or height == 0. */
356 Rect rect = {container->x, container->y, max(container->width, 1), 1};
361 /* Don’t generate events for our new window, it should *not* be managed */
362 mask |= XCB_CW_OVERRIDE_REDIRECT;
365 /* We want to know when… */
366 mask |= XCB_CW_EVENT_MASK;
367 values[1] = XCB_EVENT_MASK_ENTER_WINDOW | /* …mouse is moved into our window */
368 XCB_EVENT_MASK_BUTTON_PRESS | /* …mouse is pressed */
369 XCB_EVENT_MASK_EXPOSURE; /* …our window needs to be redrawn */
371 struct Stack_Window *stack_win = &(container->stack_win);
372 stack_win->window = create_window(conn, rect, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_CURSOR_LEFT_PTR, false, mask, values);
374 stack_win->rect.height = 0;
376 /* Initialize the entry for our cached pixmap. It will be
377 * created as soon as it’s needed (see cached_pixmap_prepare). */
378 memset(&(stack_win->pixmap), 0, sizeof(struct Cached_Pixmap));
379 stack_win->pixmap.referred_rect = &stack_win->rect;
380 stack_win->pixmap.referred_drawable = stack_win->window;
382 stack_win->container = container;
384 SLIST_INSERT_HEAD(&stack_wins, stack_win, stack_windows);
386 if (container->mode == MODE_STACK || container->mode == MODE_TABBED)
387 leave_stack_mode(conn, container);
390 container->mode = mode;
392 /* Force reconfiguration of each client */
395 CIRCLEQ_FOREACH(client, &(container->clients), clients)
396 client->force_reconfigure = true;
400 if (container->currently_focused != NULL) {
401 /* We need to make sure that this client is above *each* of the
402 * other clients in this container */
403 Client *last_focused = get_last_focused_client(conn, container, container->currently_focused);
405 CIRCLEQ_FOREACH(client, &(container->clients), clients) {
406 if (client == container->currently_focused || client == last_focused)
409 DLOG("setting %08x below %08x / %08x\n", client->frame, container->currently_focused->frame);
410 uint32_t values[] = { container->currently_focused->frame, XCB_STACK_MODE_BELOW };
411 xcb_configure_window(conn, client->frame,
412 XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE, values);
415 if (last_focused != NULL) {
416 DLOG("Putting last_focused directly underneath the currently focused\n");
417 uint32_t values[] = { container->currently_focused->frame, XCB_STACK_MODE_BELOW };
418 xcb_configure_window(conn, last_focused->frame,
419 XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE, values);
423 set_focus(conn, container->currently_focused, true);
428 * Gets the first matching client for the given window class/window title.
429 * If the paramater specific is set to a specific client, only this one
433 Client *get_matching_client(xcb_connection_t *conn, const char *window_classtitle,
435 char *to_class, *to_title, *to_title_ucs = NULL;
436 int to_title_ucs_len = 0;
437 Client *matching = NULL;
439 to_class = sstrdup(window_classtitle);
441 /* If a title was specified, split both strings at the slash */
442 if ((to_title = strstr(to_class, "/")) != NULL) {
443 *(to_title++) = '\0';
444 /* Convert to UCS-2 */
445 to_title_ucs = convert_utf8_to_ucs2(to_title, &to_title_ucs_len);
448 /* If we were given a specific client we only check if that one matches */
449 if (specific != NULL) {
450 if (client_matches_class_name(specific, to_class, to_title, to_title_ucs, to_title_ucs_len))
455 DLOG("Getting clients for class \"%s\" / title \"%s\"\n", to_class, to_title);
457 TAILQ_FOREACH(ws, workspaces, workspaces) {
458 if (ws->output == NULL)
462 SLIST_FOREACH(client, &(ws->focus_stack), focus_clients) {
463 DLOG("Checking client with class=%s / %s, name=%s\n", client->window_class_instance,
464 client->window_class_class, client->name);
465 if (!client_matches_class_name(client, to_class, to_title, to_title_ucs, to_title_ucs_len))
480 * Goes through the list of arguments (for exec()) and checks if the given argument
481 * is present. If not, it copies the arguments (because we cannot realloc it) and
482 * appends the given argument.
485 static char **append_argument(char **original, char *argument) {
487 for (num_args = 0; original[num_args] != NULL; num_args++) {
488 DLOG("original argument: \"%s\"\n", original[num_args]);
489 /* If the argument is already present we return the original pointer */
490 if (strcmp(original[num_args], argument) == 0)
493 /* Copy the original array */
494 char **result = smalloc((num_args+2) * sizeof(char*));
495 memcpy(result, original, num_args * sizeof(char*));
496 result[num_args] = argument;
497 result[num_args+1] = NULL;
503 * Restart i3 in-place
504 * appends -a to argument list to disable autostart
508 restore_geometry(global_conn);
510 LOG("restarting \"%s\"...\n", start_argv[0]);
511 /* make sure -a is in the argument list or append it */
512 start_argv = append_argument(start_argv, "-a");
514 execvp(start_argv[0], start_argv);
518 #if defined(__OpenBSD__)
522 * Find the first occurrence of the byte string s in byte string l.
525 void *memmem(const void *l, size_t l_len, const void *s, size_t s_len) {
526 register char *cur, *last;
527 const char *cl = (const char *)l;
528 const char *cs = (const char *)s;
530 /* we need something to compare */
531 if (l_len == 0 || s_len == 0)
534 /* "s" must be smaller or equal to "l" */
538 /* special case where s_len == 1 */
540 return memchr(l, (int)*cs, l_len);
542 /* the last position where its possible to find "s" in "l" */
543 last = (char *)cl + l_len - s_len;
545 for (cur = (char *)cl; cur <= last; cur++)
546 if (cur[0] == cs[0] && memcmp(cur, cs, s_len) == 0)