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/* rlmbutil.h -- utility functions for multibyte characters. */

/* Copyright (C) 2001, 2003 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,

   59 Temple Place, Suite 330, Boston, MA 02111 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.

   Some platforms have the multibyte functions such as mbsrtowcs but

   are lacking the multitype type mbstate_t.  BeOS (unknown version)

   and HP/UX 11.23 without _XOPEN_SOURCE=500 are like this.

   We really need mbstate_t type to operate properly.  For example, see

   compute_lcd_of_matches, where two mbstate_t's are active at the same

   time.  So we require both the functions and the mbstate_t type in

   order to enable multibyte support.  */

   /* Solaris 2.5 has a bug: <wchar.h> must be included before <wctype.h>.  */

#if defined (HAVE_WCTYPE_H) && defined (HAVE_WCHAR_H)

#  include <wchar.h>

#  include <wctype.h>

#  if defined (HAVE_MBSTATE_T) && defined (HAVE_MBSRTOWCS) && defined (HAVE_MBRTOWC) && defined (HAVE_MBRLEN) && 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) ? 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)

#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_ */