new

static VALUE
dir_initialize(int argc, VALUE *argv, VALUE dir)
{
    struct dir_data *dp;
    rb_encoding  *fsenc;
    VALUE dirname, opt;
    static VALUE sym_enc;

    if (!sym_enc) {
        sym_enc = ID2SYM(rb_intern("encoding"));
    }
    fsenc = rb_filesystem_encoding();

    argc = rb_scan_args(argc, argv, "1:", &dirname, &opt);

    if (!NIL_P(opt)) {
        VALUE enc = rb_hash_aref(opt, sym_enc);
        if (!NIL_P(enc)) {
            fsenc = rb_to_encoding(enc);
        }
    }

    GlobPathValue(dirname, FALSE);
    dirname = rb_str_encode_ospath(dirname);

    TypedData_Get_Struct(dir, struct dir_data, &dir_data_type, dp);
    if (dp->dir) closedir(dp->dir);
    dp->dir = NULL;
    dp->path = Qnil;
    dp->enc = fsenc;
    dp->dir = opendir(RSTRING_PTR(dirname));
    if (dp->dir == NULL) {
        if (errno == EMFILE || errno == ENFILE) {
            rb_gc();
            dp->dir = opendir(RSTRING_PTR(dirname));
        }
        if (dp->dir == NULL) {
            rb_sys_fail(RSTRING_PTR(dirname));
        }
    }
    dp->path = rb_str_dup_frozen(dirname);

    return dir;
}