385 lines
11 KiB
C
385 lines
11 KiB
C
#undef I3__FILE__
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#define I3__FILE__ "util.c"
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/*
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* vim:ts=4:sw=4:expandtab
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*
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* i3 - an improved dynamic tiling window manager
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* © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
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*
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* util.c: Utility functions, which can be useful everywhere within i3 (see
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* also libi3).
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*
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*/
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#include "all.h"
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#include <sys/wait.h>
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#include <stdarg.h>
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#if defined(__OpenBSD__)
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#include <sys/cdefs.h>
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#endif
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#include <fcntl.h>
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#include <pwd.h>
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#include <yajl/yajl_version.h>
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#include <libgen.h>
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#define SN_API_NOT_YET_FROZEN 1
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#include <libsn/sn-launcher.h>
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int min(int a, int b) {
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return (a < b ? a : b);
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}
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int max(int a, int b) {
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return (a > b ? a : b);
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}
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bool rect_contains(Rect rect, uint32_t x, uint32_t y) {
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return (x >= rect.x &&
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x <= (rect.x + rect.width) &&
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y >= rect.y &&
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y <= (rect.y + rect.height));
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}
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Rect rect_add(Rect a, Rect b) {
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return (Rect){a.x + b.x,
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a.y + b.y,
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a.width + b.width,
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a.height + b.height};
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}
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/*
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* Updates *destination with new_value and returns true if it was changed or false
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* if it was the same
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*
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*/
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bool update_if_necessary(uint32_t *destination, const uint32_t new_value) {
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uint32_t old_value = *destination;
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return ((*destination = new_value) != old_value);
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}
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/*
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* exec()s an i3 utility, for example the config file migration script or
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* i3-nagbar. This function first searches $PATH for the given utility named,
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* then falls back to the dirname() of the i3 executable path and then falls
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* back to the dirname() of the target of /proc/self/exe (on linux).
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*
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* This function should be called after fork()ing.
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*
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* The first argument of the given argv vector will be overwritten with the
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* executable name, so pass NULL.
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*
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* If the utility cannot be found in any of these locations, it exits with
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* return code 2.
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*
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*/
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void exec_i3_utility(char *name, char *argv[]) {
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/* start the migration script, search PATH first */
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char *migratepath = name;
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argv[0] = migratepath;
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execvp(migratepath, argv);
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/* if the script is not in path, maybe the user installed to a strange
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* location and runs the i3 binary with an absolute path. We use
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* argv[0]’s dirname */
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char *pathbuf = strdup(start_argv[0]);
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char *dir = dirname(pathbuf);
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sasprintf(&migratepath, "%s/%s", dir, name);
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argv[0] = migratepath;
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execvp(migratepath, argv);
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#if defined(__linux__)
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/* on linux, we have one more fall-back: dirname(/proc/self/exe) */
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char buffer[BUFSIZ];
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if (readlink("/proc/self/exe", buffer, BUFSIZ) == -1) {
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warn("could not read /proc/self/exe");
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_exit(1);
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}
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dir = dirname(buffer);
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sasprintf(&migratepath, "%s/%s", dir, name);
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argv[0] = migratepath;
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execvp(migratepath, argv);
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#endif
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warn("Could not start %s", name);
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_exit(2);
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}
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/*
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* Checks a generic cookie for errors and quits with the given message if there
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* was an error.
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*
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*/
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void check_error(xcb_connection_t *conn, xcb_void_cookie_t cookie, char *err_message) {
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xcb_generic_error_t *error = xcb_request_check(conn, cookie);
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if (error != NULL) {
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fprintf(stderr, "ERROR: %s (X error %d)\n", err_message , error->error_code);
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xcb_disconnect(conn);
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exit(-1);
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}
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}
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/*
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* This function resolves ~ in pathnames.
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* It may resolve wildcards in the first part of the path, but if no match
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* or multiple matches are found, it just returns a copy of path as given.
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*
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*/
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char *resolve_tilde(const char *path) {
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static glob_t globbuf;
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char *head, *tail, *result;
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tail = strchr(path, '/');
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head = strndup(path, tail ? tail - path : strlen(path));
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int res = glob(head, GLOB_TILDE, NULL, &globbuf);
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free(head);
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/* no match, or many wildcard matches are bad */
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if (res == GLOB_NOMATCH || globbuf.gl_pathc != 1)
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result = sstrdup(path);
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else if (res != 0) {
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die("glob() failed");
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} else {
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head = globbuf.gl_pathv[0];
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result = scalloc(strlen(head) + (tail ? strlen(tail) : 0) + 1);
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strncpy(result, head, strlen(head));
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if (tail)
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strncat(result, tail, strlen(tail));
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}
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globfree(&globbuf);
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return result;
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}
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/*
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* Checks if the given path exists by calling stat().
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*
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*/
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bool path_exists(const char *path) {
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struct stat buf;
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return (stat(path, &buf) == 0);
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}
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/*
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* Goes through the list of arguments (for exec()) and checks if the given argument
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* is present. If not, it copies the arguments (because we cannot realloc it) and
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* appends the given argument.
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*
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*/
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static char **append_argument(char **original, char *argument) {
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int num_args;
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for (num_args = 0; original[num_args] != NULL; num_args++) {
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DLOG("original argument: \"%s\"\n", original[num_args]);
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/* If the argument is already present we return the original pointer */
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if (strcmp(original[num_args], argument) == 0)
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return original;
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}
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/* Copy the original array */
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char **result = smalloc((num_args+2) * sizeof(char*));
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memcpy(result, original, num_args * sizeof(char*));
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result[num_args] = argument;
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result[num_args+1] = NULL;
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return result;
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}
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/*
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* Returns the name of a temporary file with the specified prefix.
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*
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*/
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char *get_process_filename(const char *prefix) {
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/* dir stores the directory path for this and all subsequent calls so that
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* we only create a temporary directory once per i3 instance. */
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static char *dir = NULL;
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if (dir == NULL) {
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/* Check if XDG_RUNTIME_DIR is set. If so, we use XDG_RUNTIME_DIR/i3 */
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if ((dir = getenv("XDG_RUNTIME_DIR"))) {
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char *tmp;
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sasprintf(&tmp, "%s/i3", dir);
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dir = tmp;
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if (!path_exists(dir)) {
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if (mkdir(dir, 0700) == -1) {
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perror("mkdir()");
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return NULL;
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}
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}
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} else {
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/* If not, we create a (secure) temp directory using the template
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* /tmp/i3-<user>.XXXXXX */
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struct passwd *pw = getpwuid(getuid());
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const char *username = pw ? pw->pw_name : "unknown";
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sasprintf(&dir, "/tmp/i3-%s.XXXXXX", username);
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/* mkdtemp modifies dir */
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if (mkdtemp(dir) == NULL) {
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perror("mkdtemp()");
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return NULL;
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}
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}
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}
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char *filename;
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sasprintf(&filename, "%s/%s.%d", dir, prefix, getpid());
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return filename;
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}
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#define y(x, ...) yajl_gen_ ## x (gen, ##__VA_ARGS__)
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#define ystr(str) yajl_gen_string(gen, (unsigned char*)str, strlen(str))
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char *store_restart_layout(void) {
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setlocale(LC_NUMERIC, "C");
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#if YAJL_MAJOR >= 2
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yajl_gen gen = yajl_gen_alloc(NULL);
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#else
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yajl_gen gen = yajl_gen_alloc(NULL, NULL);
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#endif
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dump_node(gen, croot, true);
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setlocale(LC_NUMERIC, "");
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const unsigned char *payload;
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#if YAJL_MAJOR >= 2
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size_t length;
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#else
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unsigned int length;
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#endif
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y(get_buf, &payload, &length);
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/* create a temporary file if one hasn't been specified, or just
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* resolve the tildes in the specified path */
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char *filename;
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if (config.restart_state_path == NULL) {
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filename = get_process_filename("restart-state");
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if (!filename)
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return NULL;
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} else {
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filename = resolve_tilde(config.restart_state_path);
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}
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int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
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if (fd == -1) {
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perror("open()");
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free(filename);
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return NULL;
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}
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int written = 0;
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while (written < length) {
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int n = write(fd, payload + written, length - written);
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/* TODO: correct error-handling */
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if (n == -1) {
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perror("write()");
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free(filename);
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close(fd);
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return NULL;
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}
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if (n == 0) {
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printf("write == 0?\n");
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free(filename);
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close(fd);
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return NULL;
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}
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written += n;
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#if YAJL_MAJOR >= 2
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printf("written: %d of %zd\n", written, length);
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#else
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printf("written: %d of %d\n", written, length);
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#endif
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}
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close(fd);
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if (length > 0) {
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printf("layout: %.*s\n", (int)length, payload);
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}
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y(free);
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return filename;
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}
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/*
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* Restart i3 in-place
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* appends -a to argument list to disable autostart
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*
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*/
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void i3_restart(bool forget_layout) {
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char *restart_filename = forget_layout ? NULL : store_restart_layout();
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kill_configerror_nagbar(true);
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kill_commanderror_nagbar(true);
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restore_geometry();
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ipc_shutdown();
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LOG("restarting \"%s\"...\n", start_argv[0]);
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/* make sure -a is in the argument list or append it */
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start_argv = append_argument(start_argv, "-a");
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/* replace -r <file> so that the layout is restored */
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if (restart_filename != NULL) {
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/* create the new argv */
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int num_args;
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for (num_args = 0; start_argv[num_args] != NULL; num_args++);
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char **new_argv = scalloc((num_args + 3) * sizeof(char*));
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/* copy the arguments, but skip the ones we'll replace */
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int write_index = 0;
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bool skip_next = false;
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for (int i = 0; i < num_args; ++i) {
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if (skip_next)
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skip_next = false;
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else if (!strcmp(start_argv[i], "-r") ||
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!strcmp(start_argv[i], "--restart"))
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skip_next = true;
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else
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new_argv[write_index++] = start_argv[i];
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}
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/* add the arguments we'll replace */
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new_argv[write_index++] = "--restart";
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new_argv[write_index] = restart_filename;
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/* swap the argvs */
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start_argv = new_argv;
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}
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execvp(start_argv[0], start_argv);
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/* not reached */
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}
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#if defined(__OpenBSD__) || defined(__APPLE__)
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/*
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* Taken from FreeBSD
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* Find the first occurrence of the byte string s in byte string l.
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*
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*/
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void *memmem(const void *l, size_t l_len, const void *s, size_t s_len) {
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register char *cur, *last;
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const char *cl = (const char *)l;
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const char *cs = (const char *)s;
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/* we need something to compare */
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if (l_len == 0 || s_len == 0)
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return NULL;
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/* "s" must be smaller or equal to "l" */
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if (l_len < s_len)
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return NULL;
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/* special case where s_len == 1 */
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if (s_len == 1)
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return memchr(l, (int)*cs, l_len);
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/* the last position where its possible to find "s" in "l" */
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last = (char *)cl + l_len - s_len;
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for (cur = (char *)cl; cur <= last; cur++)
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if (cur[0] == cs[0] && memcmp(cur, cs, s_len) == 0)
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return cur;
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return NULL;
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}
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#endif
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