char *xcb_util_get_property(xcb_connection_t *conn, xcb_window_t window, xcb_atom_t atom,
xcb_atom_t type, size_t size) {
xcb_get_property_cookie_t cookie;
xcb_get_property_reply_t *reply;
xcb_generic_error_t *err;
int reply_length;
char *content;
cookie = xcb_get_property(conn, 0, window, atom, type, 0, size);
reply = xcb_get_property_reply(conn, cookie, &err);
if (err != NULL) {
FREE(err);
return NULL;
}
if (reply == NULL || (reply_length = xcb_get_property_value_length(reply)) == 0) {
FREE(reply);
return NULL;
}
if (reply->bytes_after > 0) {
size_t adjusted_size = size + ceil(reply->bytes_after / 4.0);
FREE(reply);
return xcb_util_get_property(conn, window, atom, type, adjusted_size);
}
if (asprintf(&content, "%.*s", reply_length, (char *)xcb_get_property_value(reply)) < 0) {
FREE(reply);
return NULL;
}
FREE(reply);
return content;
}
/*
* Loads the RESOURCE_MANAGER property and creates a database with its
* contents. If the database could not be created, this function will return
* NULL.
*
* @param conn A working XCB connection.
* @param screen The xcb_screen_t* screen to use.
* @returns The database described by the RESOURCE_MANAGER property.
*
* @ingroup xcb_xrm_database_t
*/
xcb_xrm_database_t *xcb_xrm_database_from_resource_manager(xcb_connection_t *conn, xcb_screen_t *screen) {
xcb_xrm_database_t *database;
char *resources = xcb_util_get_property(conn, screen->root, XCB_ATOM_RESOURCE_MANAGER,
XCB_ATOM_STRING, 16 * 1024);
if (resources == NULL) {
return NULL;
}
/* Parse the resource string. */
database = xcb_xrm_database_from_string(resources);
FREE(resources);
return database;
}
