void listdir(char *path, int size, int indent) {

    DIR *d;
    struct dirent *dir;

    int len = strlen(path);

    if (!(d = opendir(path))) {
        return;
    }
    printf("%s\n", path);
    for (;(dir = readdir(d)) != NULL;) {
        char *name = dir->d_name;
        if (dir->d_type == DT_DIR) {
            if (dir->d_name[0] != '.') {
                path[len] = '/';
                strcpy(path + len + 1, name);
                listdir(path, size, indent + 5);
                path[len] = '\0';
            }
        } else {
            if (name) {
                printf("%s\n", name);
            } else {
                printf("%s\n", path);
            }
        }
    }
    closedir(d);
}

int main(int ac, char **av) {
    listdir(av[1], strlen(av[1]), 5);
    return 0;
}