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diff --git a/lib/readline/keymaps.h b/lib/readline/keymaps.h
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+/* keymaps.h -- Manipulation of readline keymaps. */
+
+/* Copyright (C) 1987, 1989, 1992-2021 Free Software Foundation, Inc.
+
+   This file is part of the GNU Readline Library (Readline), a library
+   for reading lines of text with interactive input and history editing.      
+
+   Readline is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Readline is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Readline.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _KEYMAPS_H_
+#define _KEYMAPS_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined (READLINE_LIBRARY)
+#  include "rlstdc.h"
+#  include "chardefs.h"
+#  include "rltypedefs.h"
+#else
+#  include <readline/rlstdc.h>
+#  include <readline/chardefs.h>
+#  include <readline/rltypedefs.h>
+#endif
+
+/* A keymap contains one entry for each key in the ASCII set.
+   Each entry consists of a type and a pointer.
+   FUNCTION is the address of a function to run, or the
+   address of a keymap to indirect through.
+   TYPE says which kind of thing FUNCTION is. */
+typedef struct _keymap_entry {
+  char type;
+  rl_command_func_t *function;
+} KEYMAP_ENTRY;
+
+/* This must be large enough to hold bindings for all of the characters
+   in a desired character set (e.g, 128 for ASCII, 256 for ISO Latin-x,
+   and so on) plus one for subsequence matching. */
+#define KEYMAP_SIZE 257
+#define ANYOTHERKEY KEYMAP_SIZE-1
+
+typedef KEYMAP_ENTRY KEYMAP_ENTRY_ARRAY[KEYMAP_SIZE];
+typedef KEYMAP_ENTRY *Keymap;
+
+/* The values that TYPE can have in a keymap entry. */
+#define ISFUNC 0
+#define ISKMAP 1
+#define ISMACR 2
+
+extern KEYMAP_ENTRY_ARRAY emacs_standard_keymap, emacs_meta_keymap, emacs_ctlx_keymap;
+extern KEYMAP_ENTRY_ARRAY vi_insertion_keymap, vi_movement_keymap;
+
+/* Return a new, empty keymap.
+   Free it with free() when you are done. */
+extern Keymap rl_make_bare_keymap (void);
+
+/* Return a new keymap which is a copy of MAP. */
+extern Keymap rl_copy_keymap (Keymap);
+
+/* Return a new keymap with the printing characters bound to rl_insert,
+   the lowercase Meta characters bound to run their equivalents, and
+   the Meta digits bound to produce numeric arguments. */
+extern Keymap rl_make_keymap (void);
+
+/* Free the storage associated with a keymap. */
+extern void rl_discard_keymap (Keymap);
+
+/* These functions actually appear in bind.c */
+
+/* Return the keymap corresponding to a given name.  Names look like
+   `emacs' or `emacs-meta' or `vi-insert'.  */
+extern Keymap rl_get_keymap_by_name (const char *);
+
+/* Return the current keymap. */
+extern Keymap rl_get_keymap (void);
+
+/* Set the current keymap to MAP. */
+extern void rl_set_keymap (Keymap);
+
+/* Set the name of MAP to NAME */
+extern int rl_set_keymap_name (const char *, Keymap);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _KEYMAPS_H_ */