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diff --git a/circuitpython/shared/readline/readline.h b/circuitpython/shared/readline/readline.h
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2013, 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef MICROPY_INCLUDED_LIB_MP_READLINE_READLINE_H
+#define MICROPY_INCLUDED_LIB_MP_READLINE_READLINE_H
+
+#include "py/misc.h"
+
+#define CHAR_CTRL_A (1)
+#define CHAR_CTRL_B (2)
+#define CHAR_CTRL_C (3)
+#define CHAR_CTRL_D (4)
+#define CHAR_CTRL_E (5)
+#define CHAR_CTRL_F (6)
+#define CHAR_CTRL_K (11)
+#define CHAR_CTRL_N (14)
+#define CHAR_CTRL_P (16)
+#define CHAR_CTRL_U (21)
+#define CHAR_CTRL_W (23)
+
+void readline_init0(void);
+int readline(vstr_t *line, const char *prompt);
+void readline_push_history(const char *line);
+
+void readline_init(vstr_t *line, const char *prompt);
+void readline_note_newline(const char *prompt);
+int readline_process_char(int c);
+
+#endif // MICROPY_INCLUDED_LIB_MP_READLINE_READLINE_H