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+/* rlmbutil.h -- utility functions for multibyte characters. */
+
+/* Copyright (C) 2001 Free Software Foundation, Inc.
+
+ This file is part of the GNU Readline Library, a library for
+ reading lines of text with interactive input and history editing.
+
+ The GNU Readline Library 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 2, or
+ (at your option) any later version.
+
+ The GNU Readline Library 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.
+
+ The GNU General Public License is often shipped with GNU software, and
+ is generally kept in a file called COPYING or LICENSE. If you do not
+ have a copy of the license, write to the Free Software Foundation,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA. */
+
+#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 amendement 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 */
+/************************************************/
+
+/*
+ * 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 PARAMS((char *, int, int));
+extern int _rl_find_next_mbchar PARAMS((char *, int, int, int));
+
+#ifdef HANDLE_MULTIBYTE
+
+extern int _rl_compare_chars PARAMS((char *, int, mbstate_t *, char *, int, mbstate_t *));
+extern int _rl_get_char_len PARAMS((char *, mbstate_t *));
+extern int _rl_adjust_point PARAMS((char *, int, mbstate_t *));
+
+extern int _rl_read_mbchar PARAMS((char *, int));
+extern int _rl_read_mbstring PARAMS((int, char *, int));
+
+extern int _rl_is_mbchar_matched PARAMS((char *, int, int, char *, int));
+
+extern wchar_t _rl_char_value PARAMS((char *, int));
+extern int _rl_walphabetic PARAMS((wchar_t));
+
+#define _rl_to_wupper(wc) (iswlower (wc) ? (wchar_t)towupper (wc) : (wc))
+#define _rl_to_wlower(wc) (iswupper (wc) ? (wchar_t)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)
+
+#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)
+
+#endif /* !HANDLE_MULTIBYTE */
+
+extern int rl_byte_oriented;
+
+#endif /* _RL_MBUTIL_H_ */