gets

static VALUE
strio_gets(int argc, VALUE *argv, VALUE self)
{
    struct getline_arg arg;
    VALUE str;

    if (prepare_getline_args(&arg, argc, argv)->limit == 0) {
        return rb_str_new(0, 0);
    }

    str = strio_getline(&arg, readable(self));
    rb_lastline_set(str);
    return str;
}