reopen

static VALUE
strio_reopen(int argc, VALUE *argv, VALUE self)
{
    if (!OBJ_TAINTED(self)) rb_secure(4);
    if (argc == 1 && TYPE(*argv) != T_STRING) {
        return strio_copy(self, *argv);
    }
    strio_init(argc, argv, StringIO(self));
    return self;
}