i3/src/util.c

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