2 * vim:ts=4:sw=4:expandtab
4 * i3 - an improved dynamic tiling window manager
6 * © 2009-2010 Michael Stapelberg and contributors
8 * See file LICENSE for license information.
10 * util.c: Utility functions, which can be useful everywhere.
16 #if defined(__OpenBSD__)
17 #include <sys/cdefs.h>
24 static iconv_t conversion_descriptor = 0;
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 * The s* functions (safe) are wrappers around malloc, strdup, …, which exits if one of
61 * the called functions returns NULL, meaning that there is no more memory available
64 void *smalloc(size_t size) {
65 void *result = malloc(size);
66 exit_if_null(result, "Error: out of memory (malloc(%zd))\n", size);
70 void *scalloc(size_t size) {
71 void *result = calloc(size, 1);
72 exit_if_null(result, "Error: out of memory (calloc(%zd))\n", size);
76 void *srealloc(void *ptr, size_t size) {
77 void *result = realloc(ptr, size);
78 exit_if_null(result, "Error: out memory (realloc(%zd))\n", size);
82 char *sstrdup(const char *str) {
83 char *result = strdup(str);
84 exit_if_null(result, "Error: out of memory (strdup())\n");
89 * Starts the given application by passing it through a shell. We use double fork
90 * to avoid zombie processes. As the started application’s parent exits (immediately),
91 * the application is reparented to init (process-id 1), which correctly handles
92 * childs, so we don’t have to do it :-).
94 * The shell is determined by looking for the SHELL environment variable. If it
95 * does not exist, /bin/sh is used.
98 void start_application(const char *command) {
99 LOG("executing: %s\n", command);
104 /* Stores the path of the shell */
105 static const char *shell = NULL;
108 if ((shell = getenv("SHELL")) == NULL)
111 /* This is the child */
112 execl(shell, shell, "-c", command, (void*)NULL);
121 * Checks a generic cookie for errors and quits with the given message if there
125 void check_error(xcb_connection_t *conn, xcb_void_cookie_t cookie, char *err_message) {
126 xcb_generic_error_t *error = xcb_request_check(conn, cookie);
128 fprintf(stderr, "ERROR: %s (X error %d)\n", err_message , error->error_code);
129 xcb_disconnect(conn);
135 * Converts the given string to UCS-2 big endian for use with
136 * xcb_image_text_16(). The amount of real glyphs is stored in real_strlen,
137 * a buffer containing the UCS-2 encoded string (16 bit per glyph) is
138 * returned. It has to be freed when done.
141 char *convert_utf8_to_ucs2(char *input, int *real_strlen) {
142 size_t input_size = strlen(input) + 1;
143 /* UCS-2 consumes exactly two bytes for each glyph */
144 int buffer_size = input_size * 2;
146 char *buffer = smalloc(buffer_size);
147 size_t output_size = buffer_size;
148 /* We need to use an additional pointer, because iconv() modifies it */
149 char *output = buffer;
151 /* We convert the input into UCS-2 big endian */
152 if (conversion_descriptor == 0) {
153 conversion_descriptor = iconv_open("UCS-2BE", "UTF-8");
154 if (conversion_descriptor == 0) {
155 fprintf(stderr, "error opening the conversion context\n");
160 /* Get the conversion descriptor back to original state */
161 iconv(conversion_descriptor, NULL, NULL, NULL, NULL);
163 /* Convert our text */
164 int rc = iconv(conversion_descriptor, (void*)&input, &input_size, &output, &output_size);
165 if (rc == (size_t)-1) {
166 perror("Converting to UCS-2 failed");
167 if (real_strlen != NULL)
172 if (real_strlen != NULL)
173 *real_strlen = ((buffer_size - output_size) / 2) - 1;
179 * Goes through the list of arguments (for exec()) and checks if the given argument
180 * is present. If not, it copies the arguments (because we cannot realloc it) and
181 * appends the given argument.
184 static char **append_argument(char **original, char *argument) {
186 for (num_args = 0; original[num_args] != NULL; num_args++) {
187 DLOG("original argument: \"%s\"\n", original[num_args]);
188 /* If the argument is already present we return the original pointer */
189 if (strcmp(original[num_args], argument) == 0)
192 /* Copy the original array */
193 char **result = smalloc((num_args+2) * sizeof(char*));
194 memcpy(result, original, num_args * sizeof(char*));
195 result[num_args] = argument;
196 result[num_args+1] = NULL;
201 #define y(x, ...) yajl_gen_ ## x (gen, ##__VA_ARGS__)
202 #define ystr(str) yajl_gen_string(gen, (unsigned char*)str, strlen(str))
204 void store_restart_layout() {
205 setlocale(LC_NUMERIC, "C");
206 yajl_gen gen = yajl_gen_alloc(NULL, NULL);
208 dump_node(gen, croot, true);
210 setlocale(LC_NUMERIC, "");
212 const unsigned char *payload;
214 y(get_buf, &payload, &length);
216 char *globbed = resolve_tilde(config.restart_state_path);
217 int fd = open(globbed, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
225 while (written < length) {
226 int n = write(fd, payload + written, length - written);
227 /* TODO: correct error-handling */
233 printf("write == 0?\n");
237 printf("written: %d of %d\n", written, length);
241 printf("layout: %.*s\n", length, payload);
247 * Restart i3 in-place
248 * appends -a to argument list to disable autostart
252 store_restart_layout();
257 LOG("restarting \"%s\"...\n", start_argv[0]);
258 /* make sure -a is in the argument list or append it */
259 start_argv = append_argument(start_argv, "-a");
261 execvp(start_argv[0], start_argv);
267 #if defined(__OpenBSD__)
271 * Find the first occurrence of the byte string s in byte string l.
274 void *memmem(const void *l, size_t l_len, const void *s, size_t s_len) {
275 register char *cur, *last;
276 const char *cl = (const char *)l;
277 const char *cs = (const char *)s;
279 /* we need something to compare */
280 if (l_len == 0 || s_len == 0)
283 /* "s" must be smaller or equal to "l" */
287 /* special case where s_len == 1 */
289 return memchr(l, (int)*cs, l_len);
291 /* the last position where its possible to find "s" in "l" */
292 last = (char *)cl + l_len - s_len;
294 for (cur = (char *)cl; cur <= last; cur++)
295 if (cur[0] == cs[0] && memcmp(cur, cs, s_len) == 0)