xcb search window by name

xcb_search_window_by_name.c

xcb_window_t search_window_by_name(xcb_connection_t *conn, xcb_window_t window, const char *search_string) {
    // check name
    xcb_get_property_reply_t *name_reply = xcb_get_property_reply(conn, xcb_get_property(conn, 0, window, XCB_ATOM_WM_NAME, XCB_ATOM_STRING, 0, 256), NULL);
    if (name_reply) {
        char *name = xcb_get_property_value(name_reply);
	free(name_reply);
        if (name && !strcmp(name, search_string)) return window;
    }

    // get window tree
    xcb_query_tree_reply_t *tree_reply = xcb_query_tree_reply(conn, xcb_query_tree(conn, window), NULL);
    if (!tree_reply) return 0;

    // get children
    xcb_window_t *children = xcb_query_tree_children(tree_reply);
    int num_children = xcb_query_tree_children_length(tree_reply);

    // recurse
    for (int i = 0; i < num_children; ++i) {
        xcb_window_t child = search_window_by_name(conn, children[i], search_string);
        if (child != 0) { // child found
            free(tree_reply);
            return child;
        }
    }

    // not found in children
    free(tree_reply);
    return 0;
}