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diff --git a/lib/readline/rlmbutil.h b/lib/readline/rlmbutil.h
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@@ -0,0 +1,225 @@
+/* rlmbutil.h -- utility functions for multibyte characters. */
+
+/* Copyright (C) 2001-2021 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/>.
+*/
+
+#if !defined (_RL_MBUTIL_H_)
+#define _RL_MBUTIL_H_
+
+#include "rlstdc.h"
+
+/************************************************/
+/* check multibyte capability for I18N code     */
+/************************************************/
+
+/* For platforms which support the ISO C amendment 1 functionality we
+   support user defined character classes.  */
+   /* Solaris 2.5 has a bug: <wchar.h> must be included before <wctype.h>.  */
+#if defined (HAVE_WCTYPE_H) && defined (HAVE_WCHAR_H) && defined (HAVE_LOCALE_H)
+#  include <wchar.h>
+#  include <wctype.h>
+#  if defined (HAVE_ISWCTYPE) && \
+      defined (HAVE_ISWLOWER) && \
+      defined (HAVE_ISWUPPER) && \
+      defined (HAVE_MBSRTOWCS) && \
+      defined (HAVE_MBRTOWC) && \
+      defined (HAVE_MBRLEN) && \
+      defined (HAVE_TOWLOWER) && \
+      defined (HAVE_TOWUPPER) && \
+      defined (HAVE_WCHAR_T) && \
+      defined (HAVE_WCWIDTH)
+     /* system is supposed to support XPG5 */
+#    define HANDLE_MULTIBYTE      1
+#  endif
+#endif
+
+/* If we don't want multibyte chars even on a system that supports them, let
+   the configuring user turn multibyte support off. */
+#if defined (NO_MULTIBYTE_SUPPORT)
+#  undef HANDLE_MULTIBYTE
+#endif
+
+/* Some systems, like BeOS, have multibyte encodings but lack mbstate_t.  */
+#if HANDLE_MULTIBYTE && !defined (HAVE_MBSTATE_T)
+#  define wcsrtombs(dest, src, len, ps) (wcsrtombs) (dest, src, len, 0)
+#  define mbsrtowcs(dest, src, len, ps) (mbsrtowcs) (dest, src, len, 0)
+#  define wcrtomb(s, wc, ps) (wcrtomb) (s, wc, 0)
+#  define mbrtowc(pwc, s, n, ps) (mbrtowc) (pwc, s, n, 0)
+#  define mbrlen(s, n, ps) (mbrlen) (s, n, 0)
+#  define mbstate_t int
+#endif
+
+/* Make sure MB_LEN_MAX is at least 16 on systems that claim to be able to
+   handle multibyte chars (some systems define MB_LEN_MAX as 1) */
+#ifdef HANDLE_MULTIBYTE
+#  include <limits.h>
+#  if defined(MB_LEN_MAX) && (MB_LEN_MAX < 16)
+#    undef MB_LEN_MAX
+#  endif
+#  if !defined (MB_LEN_MAX)
+#    define MB_LEN_MAX 16
+#  endif
+#endif
+
+/************************************************/
+/* end of multibyte capability checks for I18N  */
+/************************************************/
+
+/*
+ * wchar_t doesn't work for 32-bit values on Windows using MSVC
+ */
+#ifdef WCHAR_T_BROKEN
+#  define WCHAR_T char32_t
+#  define MBRTOWC mbrtoc32
+#  define WCRTOMB c32rtomb
+#else	/* normal systems */
+#  define WCHAR_T wchar_t
+#  define MBRTOWC mbrtowc
+#  define WCRTOMB wcrtomb
+#endif
+
+/*
+ * Flags for _rl_find_prev_mbchar and _rl_find_next_mbchar:
+ *
+ * MB_FIND_ANY		find any multibyte character
+ * MB_FIND_NONZERO	find a non-zero-width multibyte character
+ */
+
+#define MB_FIND_ANY	0x00
+#define MB_FIND_NONZERO	0x01
+
+extern int _rl_find_prev_mbchar (char *, int, int);
+extern int _rl_find_next_mbchar (char *, int, int, int);
+
+#ifdef HANDLE_MULTIBYTE
+
+extern int _rl_compare_chars (char *, int, mbstate_t *, char *, int, mbstate_t *);
+extern int _rl_get_char_len (char *, mbstate_t *);
+extern int _rl_adjust_point (char *, int, mbstate_t *);
+
+extern int _rl_read_mbchar (char *, int);
+extern int _rl_read_mbstring (int, char *, int);
+
+extern int _rl_is_mbchar_matched (char *, int, int, char *, int);
+
+extern WCHAR_T _rl_char_value (char *, int);
+extern int _rl_walphabetic (WCHAR_T);
+
+#define _rl_to_wupper(wc)	(iswlower (wc) ? towupper (wc) : (wc))
+#define _rl_to_wlower(wc)	(iswupper (wc) ? towlower (wc) : (wc))
+
+#define MB_NEXTCHAR(b,s,c,f) \
+	((MB_CUR_MAX > 1 && rl_byte_oriented == 0) \
+		? _rl_find_next_mbchar ((b), (s), (c), (f)) \
+		: ((s) + (c)))
+#define MB_PREVCHAR(b,s,f) \
+	((MB_CUR_MAX > 1 && rl_byte_oriented == 0) \
+		? _rl_find_prev_mbchar ((b), (s), (f)) \
+		: ((s) - 1))
+
+#define MB_INVALIDCH(x)		((x) == (size_t)-1 || (x) == (size_t)-2)
+#define MB_NULLWCH(x)		((x) == 0)
+
+/* Try and shortcut the printable ascii characters to cut down the number of
+   calls to a libc wcwidth() */
+static inline int
+_rl_wcwidth (WCHAR_T wc)
+{
+  switch (wc)
+    {
+    case ' ': case '!': case '"': case '#': case '%':
+    case '&': case '\'': case '(': case ')': case '*':
+    case '+': case ',': case '-': case '.': case '/':
+    case '0': case '1': case '2': case '3': case '4':
+    case '5': case '6': case '7': case '8': case '9':
+    case ':': case ';': case '<': case '=': case '>':
+    case '?':
+    case 'A': case 'B': case 'C': case 'D': case 'E':
+    case 'F': case 'G': case 'H': case 'I': case 'J':
+    case 'K': case 'L': case 'M': case 'N': case 'O':
+    case 'P': case 'Q': case 'R': case 'S': case 'T':
+    case 'U': case 'V': case 'W': case 'X': case 'Y':
+    case 'Z':
+    case '[': case '\\': case ']': case '^': case '_':
+    case 'a': case 'b': case 'c': case 'd': case 'e':
+    case 'f': case 'g': case 'h': case 'i': case 'j':
+    case 'k': case 'l': case 'm': case 'n': case 'o':
+    case 'p': case 'q': case 'r': case 's': case 't':
+    case 'u': case 'v': case 'w': case 'x': case 'y':
+    case 'z': case '{': case '|': case '}': case '~':
+      return 1;
+    default:
+      return wcwidth (wc);
+    }
+}
+
+/* Unicode combining characters range from U+0300 to U+036F */
+#define UNICODE_COMBINING_CHAR(x) ((x) >= 768 && (x) <= 879)
+
+#if defined (WCWIDTH_BROKEN)
+#  define WCWIDTH(wc)	((_rl_utf8locale && UNICODE_COMBINING_CHAR(wc)) ? 0 : _rl_wcwidth(wc))
+#else
+#  define WCWIDTH(wc)	_rl_wcwidth(wc)
+#endif
+
+#if defined (WCWIDTH_BROKEN)
+#  define IS_COMBINING_CHAR(x)	(WCWIDTH(x) == 0 && iswcntrl(x) == 0)
+#else
+#  define IS_COMBINING_CHAR(x)	(WCWIDTH(x) == 0)
+#endif
+
+#define UTF8_SINGLEBYTE(c)	(((c) & 0x80) == 0)
+#define UTF8_MBFIRSTCHAR(c)	(((c) & 0xc0) == 0xc0)
+#define UTF8_MBCHAR(c)		(((c) & 0xc0) == 0x80)
+
+#else /* !HANDLE_MULTIBYTE */
+
+#undef MB_LEN_MAX
+#undef MB_CUR_MAX
+
+#define MB_LEN_MAX	1
+#define MB_CUR_MAX	1
+
+#define _rl_find_prev_mbchar(b, i, f)		(((i) == 0) ? (i) : ((i) - 1))
+#define _rl_find_next_mbchar(b, i1, i2, f)	((i1) + (i2))
+
+#define _rl_char_value(buf,ind)	((buf)[(ind)])
+
+#define _rl_walphabetic(c)	(rl_alphabetic (c))
+
+#define _rl_to_wupper(c)	(_rl_to_upper (c))
+#define _rl_to_wlower(c)	(_rl_to_lower (c))
+
+#define MB_NEXTCHAR(b,s,c,f)	((s) + (c))
+#define MB_PREVCHAR(b,s,f)	((s) - 1)
+
+#define MB_INVALIDCH(x)		(0)
+#define MB_NULLWCH(x)		(0)
+
+#define UTF8_SINGLEBYTE(c)	(1)
+
+#if !defined (HAVE_WCHAR_T) && !defined (wchar_t)
+#  define wchar_t int
+#endif
+
+#endif /* !HANDLE_MULTIBYTE */
+
+extern int rl_byte_oriented;
+
+#endif /* _RL_MBUTIL_H_ */