2 * vim:ts=4:sw=4:expandtab
4 * i3 - an improved dynamic tiling window manager
5 * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
7 * util.c: Utility functions, which can be useful everywhere within i3 (see
15 #if defined(__OpenBSD__)
16 #include <sys/cdefs.h>
20 #include <yajl/yajl_version.h>
23 #define SN_API_NOT_YET_FROZEN 1
24 #include <libsn/sn-launcher.h>
26 int min(int a, int b) {
27 return (a < b ? a : b);
30 int max(int a, int b) {
31 return (a > b ? a : b);
34 bool rect_contains(Rect rect, uint32_t x, uint32_t y) {
35 return (x >= rect.x &&
36 x <= (rect.x + rect.width) &&
38 y <= (rect.y + rect.height));
41 Rect rect_add(Rect a, Rect b) {
42 return (Rect){a.x + b.x,
49 * Updates *destination with new_value and returns true if it was changed or false
53 bool update_if_necessary(uint32_t *destination, const uint32_t new_value) {
54 uint32_t old_value = *destination;
56 return ((*destination = new_value) != old_value);
60 * exec()s an i3 utility, for example the config file migration script or
61 * i3-nagbar. This function first searches $PATH for the given utility named,
62 * then falls back to the dirname() of the i3 executable path and then falls
63 * back to the dirname() of the target of /proc/self/exe (on linux).
65 * This function should be called after fork()ing.
67 * The first argument of the given argv vector will be overwritten with the
68 * executable name, so pass NULL.
70 * If the utility cannot be found in any of these locations, it exits with
74 void exec_i3_utility(char *name, char *argv[]) {
75 /* start the migration script, search PATH first */
76 char *migratepath = name;
77 argv[0] = migratepath;
78 execvp(migratepath, argv);
80 /* if the script is not in path, maybe the user installed to a strange
81 * location and runs the i3 binary with an absolute path. We use
82 * argv[0]’s dirname */
83 char *pathbuf = strdup(start_argv[0]);
84 char *dir = dirname(pathbuf);
85 sasprintf(&migratepath, "%s/%s", dir, name);
86 argv[0] = migratepath;
87 execvp(migratepath, argv);
89 #if defined(__linux__)
90 /* on linux, we have one more fall-back: dirname(/proc/self/exe) */
92 if (readlink("/proc/self/exe", buffer, BUFSIZ) == -1) {
93 warn("could not read /proc/self/exe");
96 dir = dirname(buffer);
97 sasprintf(&migratepath, "%s/%s", dir, name);
98 argv[0] = migratepath;
99 execvp(migratepath, argv);
102 warn("Could not start %s", name);
107 * Checks a generic cookie for errors and quits with the given message if there
111 void check_error(xcb_connection_t *conn, xcb_void_cookie_t cookie, char *err_message) {
112 xcb_generic_error_t *error = xcb_request_check(conn, cookie);
114 fprintf(stderr, "ERROR: %s (X error %d)\n", err_message , error->error_code);
115 xcb_disconnect(conn);
121 * This function resolves ~ in pathnames.
122 * It may resolve wildcards in the first part of the path, but if no match
123 * or multiple matches are found, it just returns a copy of path as given.
126 char *resolve_tilde(const char *path) {
127 static glob_t globbuf;
128 char *head, *tail, *result;
130 tail = strchr(path, '/');
131 head = strndup(path, tail ? tail - path : strlen(path));
133 int res = glob(head, GLOB_TILDE, NULL, &globbuf);
135 /* no match, or many wildcard matches are bad */
136 if (res == GLOB_NOMATCH || globbuf.gl_pathc != 1)
137 result = sstrdup(path);
139 die("glob() failed");
141 head = globbuf.gl_pathv[0];
142 result = scalloc(strlen(head) + (tail ? strlen(tail) : 0) + 1);
143 strncpy(result, head, strlen(head));
145 strncat(result, tail, strlen(tail));
153 * Checks if the given path exists by calling stat().
156 bool path_exists(const char *path) {
158 return (stat(path, &buf) == 0);
162 * Goes through the list of arguments (for exec()) and checks if the given argument
163 * is present. If not, it copies the arguments (because we cannot realloc it) and
164 * appends the given argument.
167 static char **append_argument(char **original, char *argument) {
169 for (num_args = 0; original[num_args] != NULL; num_args++) {
170 DLOG("original argument: \"%s\"\n", original[num_args]);
171 /* If the argument is already present we return the original pointer */
172 if (strcmp(original[num_args], argument) == 0)
175 /* Copy the original array */
176 char **result = smalloc((num_args+2) * sizeof(char*));
177 memcpy(result, original, num_args * sizeof(char*));
178 result[num_args] = argument;
179 result[num_args+1] = NULL;
185 * Returns the name of a temporary file with the specified prefix.
188 char *get_process_filename(const char *prefix) {
189 char *dir = getenv("XDG_RUNTIME_DIR");
191 struct passwd *pw = getpwuid(getuid());
192 const char *username = pw ? pw->pw_name : "unknown";
193 sasprintf(&dir, "/tmp/i3-%s", username);
196 sasprintf(&tmp, "%s/i3", dir);
199 if (!path_exists(dir)) {
200 if (mkdir(dir, 0700) == -1) {
206 sasprintf(&filename, "%s/%s.%d", dir, prefix, getpid());
211 #define y(x, ...) yajl_gen_ ## x (gen, ##__VA_ARGS__)
212 #define ystr(str) yajl_gen_string(gen, (unsigned char*)str, strlen(str))
214 char *store_restart_layout() {
215 setlocale(LC_NUMERIC, "C");
217 yajl_gen gen = yajl_gen_alloc(NULL);
219 yajl_gen gen = yajl_gen_alloc(NULL, NULL);
222 dump_node(gen, croot, true);
224 setlocale(LC_NUMERIC, "");
226 const unsigned char *payload;
232 y(get_buf, &payload, &length);
234 /* create a temporary file if one hasn't been specified, or just
235 * resolve the tildes in the specified path */
237 if (config.restart_state_path == NULL) {
238 filename = get_process_filename("restart-state");
242 filename = resolve_tilde(config.restart_state_path);
245 int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
253 while (written < length) {
254 int n = write(fd, payload + written, length - written);
255 /* TODO: correct error-handling */
263 printf("write == 0?\n");
270 printf("written: %d of %zd\n", written, length);
272 printf("written: %d of %d\n", written, length);
278 printf("layout: %.*s\n", (int)length, payload);
287 * Restart i3 in-place
288 * appends -a to argument list to disable autostart
291 void i3_restart(bool forget_layout) {
292 char *restart_filename = forget_layout ? NULL : store_restart_layout();
294 kill_configerror_nagbar(true);
300 LOG("restarting \"%s\"...\n", start_argv[0]);
301 /* make sure -a is in the argument list or append it */
302 start_argv = append_argument(start_argv, "-a");
304 /* replace -r <file> so that the layout is restored */
305 if (restart_filename != NULL) {
306 /* create the new argv */
308 for (num_args = 0; start_argv[num_args] != NULL; num_args++);
309 char **new_argv = scalloc((num_args + 3) * sizeof(char*));
311 /* copy the arguments, but skip the ones we'll replace */
313 bool skip_next = false;
314 for (int i = 0; i < num_args; ++i) {
317 else if (!strcmp(start_argv[i], "-r") ||
318 !strcmp(start_argv[i], "--restart"))
321 new_argv[write_index++] = start_argv[i];
324 /* add the arguments we'll replace */
325 new_argv[write_index++] = "--restart";
326 new_argv[write_index] = restart_filename;
329 start_argv = new_argv;
332 execvp(start_argv[0], start_argv);
336 #if defined(__OpenBSD__) || defined(__APPLE__)
340 * Find the first occurrence of the byte string s in byte string l.
343 void *memmem(const void *l, size_t l_len, const void *s, size_t s_len) {
344 register char *cur, *last;
345 const char *cl = (const char *)l;
346 const char *cs = (const char *)s;
348 /* we need something to compare */
349 if (l_len == 0 || s_len == 0)
352 /* "s" must be smaller or equal to "l" */
356 /* special case where s_len == 1 */
358 return memchr(l, (int)*cs, l_len);
360 /* the last position where its possible to find "s" in "l" */
361 last = (char *)cl + l_len - s_len;
363 for (cur = (char *)cl; cur <= last; cur++)
364 if (cur[0] == cs[0] && memcmp(cur, cs, s_len) == 0)