text: /* vi:set ts=8 sts=4 sw=4 noet:
   *
   * VIM - Vi IMproved	by Bram Moolenaar
   * Multibyte extensions partly by Sung-Hoon Baek
   *
   * Do ":help uganda"  in Vim to read copying and usage conditions.
   * Do ":help credits" in Vim to see a list of people who contributed.
   * See README.txt for an overview of the Vim source code.
   */
  /*
   * mbyte.c: Code specifically for handling multi-byte characters.
   *
   * The encoding used in the core is set with 'encoding'.  When 'encoding' is
   * changed, the following four variables are set (for speed).
   * Currently these types of character encodings are supported:
   *
   * "enc_dbcs"	    When non-zero it tells the type of double byte character
   *		    encoding (Chinese, Korean, Japanese, etc.).
   *		    The cell width on the display is equal to the number of
   *		    bytes.  (exception: DBCS_JPNU with first byte 0x8e)
   *		    Recognizing the first or second byte is difficult, it
   *		    requires checking a byte sequence from the start.
   * "enc_utf8"	    When TRUE use Unicode characters in UTF-8 encoding.
   *		    The cell width on the display needs to be determined from
   *		    the character value.
   *		    Recognizing bytes is easy: 0xxx.xxxx is a single-byte
   *		    char, 10xx.xxxx is a trailing byte, 11xx.xxxx is a leading
   *		    byte of a multi-byte character.
   *		    To make things complicated, up to six composing characters
   *		    are allowed.  These are drawn on top of the first char.
   *		    For most editing the sequence of bytes with composing
   *		    characters included is considered to be one character.
   * "enc_unicode"    When 2 use 16-bit Unicode characters (or UTF-16).
   *		    When 4 use 32-but Unicode characters.
   *		    Internally characters are stored in UTF-8 encoding to
   *		    avoid NUL bytes.  Conversion happens when doing I/O.
   *		    "enc_utf8" will also be TRUE.
   *
   * "has_mbyte" is set when "enc_dbcs" or "enc_utf8" is non-zero.
   *
   * If none of these is TRUE, 8-bit bytes are used for a character.  The
   * encoding isn't currently specified (TODO).
   *
   * 'encoding' specifies the encoding used in the core.  This is in registers,
   * text manipulation, buffers, etc.  Conversion has to be done when characters
   * in another encoding are received or send:
   *
   *		       clipboard
   *			   ^
   *			   | (2)
   *			   V
   *		   +---------------+
   *	      (1)  |		   | (3)
   *  keyboard ----->|	 core	   |-----> display
   *		   |		   |
   *		   +---------------+
   *			   ^
   *			   | (4)
   *			   V
   *			 file
   *
   * (1) Typed characters arrive in the current locale.  Conversion is to be
   *     done when 'encoding' is different from 'termencoding'.
   * (2) Text will be made available with the encoding specified with
   *     'encoding'.  If this is not sufficient, system-specific conversion
   *     might be required.
   * (3) For the GUI the correct font must be selected, no conversion done.
   *     Otherwise, conversion is to be done when 'encoding' differs from
   *     'termencoding'.  (Different in the GTK+ 2 port -- 'termencoding'
   *     is always used for both input and output and must always be set to
   *     "utf-8".  gui_mch_init() does this automatically.)
   * (4) The encoding of the file is specified with 'fileencoding'.  Conversion
   *     is to be done when it's different from 'encoding'.
   *
   * The viminfo file is a special case: Only text is converted, not file names.
   * Vim scripts may contain an ":encoding" command.  This has an effect for
   * some commands, like ":menutrans"
   */
  
  #include "vim.h"
  
  #ifdef WIN32UNIX
  # ifndef WIN32_LEAN_AND_MEAN
  #  define WIN32_LEAN_AND_MEAN
  # endif
  # if defined(FEAT_GUI) || defined(FEAT_XCLIPBOARD)
  #  include <X11/Xwindows.h>
  #  define WINBYTE wBYTE
  # else
  #  include <windows.h>
  #  define WINBYTE BYTE
  # endif
  # ifdef WIN32
  #  undef WIN32	    // Some windows.h define WIN32, we don't want that here.
  # endif
  #else
  # define WINBYTE BYTE
  #endif
  
  #if (defined(MSWIN) || defined(WIN32UNIX)) && !defined(__MINGW32__)
  # include <winnls.h>
  #endif
  
  #ifdef FEAT_GUI_X11
  # include <X11/Intrinsic.h>
  #endif
  #ifdef X_LOCALE
  # include <X11/Xlocale.h>
  # if !defined(HAVE_MBLEN) && !defined(mblen)
  #  define mblen _Xmblen
  # endif
  #endif
  
  #ifdef HAVE_WCHAR_H
  # include <wchar.h>
  #endif
  
  #if 0
  // This has been disabled, because several people reported problems with the
  // wcwidth() and iswprint() library functions, esp. for Hebrew.
  # ifdef __STDC_ISO_10646__
  #  define USE_WCHAR_FUNCTIONS
  # endif
  #endif
  
  static int dbcs_char2len(int c);
  static int dbcs_char2bytes(int c, char_u *buf);
  static int dbcs_ptr2len(char_u *p);
  static int dbcs_ptr2len_len(char_u *p, int size);
  static int utf_ptr2cells_len(char_u *p, int size);
  static int dbcs_char2cells(int c);
  static int dbcs_ptr2cells_len(char_u *p, int size);
  static int dbcs_ptr2char(char_u *p);
  static int dbcs_head_off(char_u *base, char_u *p);
  #ifdef FEAT_EVAL
  static int cw_value(int c);
  #endif
  
  /*
   * Lookup table to quickly get the length in bytes of a UTF-8 character from
   * the first byte of a UTF-8 string.
   * Bytes which are illegal when used as the first byte have a 1.
   * The NUL byte has length 1.
   */
  static char utf8len_tab[256] =
  {
      1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
      1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
      1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
      1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
      1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
      1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
      2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
      3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,6,6,1,1,
  };
  
  /*
   * Like utf8len_tab above, but using a zero for illegal lead bytes.
   */
  static char utf8len_tab_zero[256] =
  {
      1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
      1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
      1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
      1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
      0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
      0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
      2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
      3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,6,6,0,0,
  };
  
  
  /*
   * Canonical encoding names and their properties.
   * "iso-8859-n" is handled by enc_canonize() directly.
   */
  static struct
  {   char *name;		int prop;		int codepage;}
  enc_canon_table[] =
  {
  #define IDX_LATIN_1	0
      {"latin1",		ENC_8BIT + ENC_LATIN1,	1252},
  #define IDX_ISO_2	1
      {"iso-8859-2",	ENC_8BIT,		0},
  #define IDX_ISO_3	2
      {"iso-8859-3",	ENC_8BIT,		0},
  #define IDX_ISO_4	3
      {"iso-8859-4",	ENC_8BIT,		0},
  #define IDX_ISO_5	4
      {"iso-8859-5",	ENC_8BIT,		0},
  #define IDX_ISO_6	5
      {"iso-8859-6",	ENC_8BIT,		0},
  #define IDX_ISO_7	6
      {"iso-8859-7",	ENC_8BIT,		0},
  #define IDX_ISO_8	7
      {"iso-8859-8",	ENC_8BIT,		0},
  #define IDX_ISO_9	8
      {"iso-8859-9",	ENC_8BIT,		0},
  #define IDX_ISO_10	9
      {"iso-8859-10",	ENC_8BIT,		0},
  #define IDX_ISO_11	10
      {"iso-8859-11",	ENC_8BIT,		0},
  #define IDX_ISO_13	11
      {"iso-8859-13",	ENC_8BIT,		0},
  #define IDX_ISO_14	12
      {"iso-8859-14",	ENC_8BIT,		0},
  #define IDX_ISO_15	13
      {"iso-8859-15",	ENC_8BIT + ENC_LATIN9,	0},
  #define IDX_KOI8_R	14
      {"koi8-r",		ENC_8BIT,		0},
  #define IDX_KOI8_U	15
      {"koi8-u",		ENC_8BIT,		0},
  #define IDX_UTF8	16
      {"utf-8",		ENC_UNICODE,		0},
  #define IDX_UCS2	17
      {"ucs-2",		ENC_UNICODE + ENC_ENDIAN_B + ENC_2BYTE, 0},
  #define IDX_UCS2LE	18
      {"ucs-2le",		ENC_UNICODE + ENC_ENDIAN_L + ENC_2BYTE, 0},
  #define IDX_UTF16	19
      {"utf-16",		ENC_UNICODE + ENC_ENDIAN_B + ENC_2WORD, 0},
  #define IDX_UTF16LE	20
      {"utf-16le",	ENC_UNICODE + ENC_ENDIAN_L + ENC_2WORD, 0},
  #define IDX_UCS4	21
      {"ucs-4",		ENC_UNICODE + ENC_ENDIAN_B + ENC_4BYTE, 0},
  #define IDX_UCS4LE	22
      {"ucs-4le",		ENC_UNICODE + ENC_ENDIAN_L + ENC_4BYTE, 0},
  
      // For debugging DBCS encoding on Unix.
  #define IDX_DEBUG	23
      {"debug",		ENC_DBCS,		DBCS_DEBUG},
  #define IDX_EUC_JP	24
      {"euc-jp",		ENC_DBCS,		DBCS_JPNU},
  #define IDX_SJIS	25
      {"sjis",		ENC_DBCS,		DBCS_JPN},
  #define IDX_EUC_KR	26
      {"euc-kr",		ENC_DBCS,		DBCS_KORU},
  #define IDX_EUC_CN	27
      {"euc-cn",		ENC_DBCS,		DBCS_CHSU},
  #define IDX_EUC_TW	28
      {"euc-tw",		ENC_DBCS,		DBCS_CHTU},
  #define IDX_BIG5	29
      {"big5",		ENC_DBCS,		DBCS_CHT},
  
      // MS-DOS and MS-Windows codepages are included here, so that they can be
      // used on Unix too.  Most of them are similar to ISO-8859 encodings, but
      // not exactly the same.
  #define IDX_CP437	30
      {"cp437",		ENC_8BIT,		437}, // like iso-8859-1
  #define IDX_CP737	31
      {"cp737",		ENC_8BIT,		737}, // like iso-8859-7
  #define IDX_CP775	32
      {"cp775",		ENC_8BIT,		775}, // Baltic
  #define IDX_CP850	33
      {"cp850",		ENC_8BIT,		850}, // like iso-8859-4
  #define IDX_CP852	34
      {"cp852",		ENC_8BIT,		852}, // like iso-8859-1
  #define IDX_CP855	35
      {"cp855",		ENC_8BIT,		855}, // like iso-8859-2
  #define IDX_CP857	36
      {"cp857",		ENC_8BIT,		857}, // like iso-8859-5
  #define IDX_CP860	37
      {"cp860",		ENC_8BIT,		860}, // like iso-8859-9
  #define IDX_CP861	38
      {"cp861",		ENC_8BIT,		861}, // like iso-8859-1
  #define IDX_CP862	39
      {"cp862",		ENC_8BIT,		862}, // like iso-8859-1
  #define IDX_CP863	40
      {"cp863",		ENC_8BIT,		863}, // like iso-8859-8
  #define IDX_CP865	41
      {"cp865",		ENC_8BIT,		865}, // like iso-8859-1
  #define IDX_CP866	42
      {"cp866",		ENC_8BIT,		866}, // like iso-8859-5
  #define IDX_CP869	43
      {"cp869",		ENC_8BIT,		869}, // like iso-8859-7
  #define IDX_CP874	44
      {"cp874",		ENC_8BIT,		874}, // Thai
  #define IDX_CP932	45
      {"cp932",		ENC_DBCS,		DBCS_JPN},
  #define IDX_CP936	46
      {"cp936",		ENC_DBCS,		DBCS_CHS},
  #define IDX_CP949	47
      {"cp949",		ENC_DBCS,		DBCS_KOR},
  #define IDX_CP950	48
      {"cp950",		ENC_DBCS,		DBCS_CHT},
  #define IDX_CP1250	49
      {"cp1250",		ENC_8BIT,		1250}, // Czech, Polish, etc.
  #define IDX_CP1251	50
      {"cp1251",		ENC_8BIT,		1251}, // Cyrillic
      // cp1252 is considered to be equal to latin1
  #define IDX_CP1253	51
      {"cp1253",		ENC_8BIT,		1253}, // Greek
  #define IDX_CP1254	52
      {"cp1254",		ENC_8BIT,		1254}, // Turkish
  #define IDX_CP1255	53
      {"cp1255",		ENC_8BIT,		1255}, // Hebrew
  #define IDX_CP1256	54
      {"cp1256",		ENC_8BIT,		1256}, // Arabic
  #define IDX_CP1257	55
      {"cp1257",		ENC_8BIT,		1257}, // Baltic
  #define IDX_CP1258	56
      {"cp1258",		ENC_8BIT,		1258}, // Vietnamese
  
  #define IDX_MACROMAN	57
      {"macroman",	ENC_8BIT + ENC_MACROMAN, 0},	// Mac OS
  #define IDX_DECMCS	58
      {"dec-mcs",		ENC_8BIT,		0},	// DEC MCS
  #define IDX_HPROMAN8	59
      {"hp-roman8",	ENC_8BIT,		0},	// HP Roman8
  #define IDX_COUNT	60
  };
  
  /*
   * Aliases for encoding names.
   */
  static struct
  {   char *name;		int canon;}
  enc_alias_table[] =
  {
      {"ansi",		IDX_LATIN_1},
      {"iso-8859-1",	IDX_LATIN_1},
      {"iso-8859",	IDX_LATIN_1},
      {"latin2",		IDX_ISO_2},
      {"latin3",		IDX_ISO_3},
      {"latin4",		IDX_ISO_4},
      {"cyrillic",	IDX_ISO_5},
      {"arabic",		IDX_ISO_6},
      {"greek",		IDX_ISO_7},
  #ifdef MSWIN
      {"hebrew",		IDX_CP1255},
  #else
      {"hebrew",		IDX_ISO_8},
  #endif
      {"latin5",		IDX_ISO_9},
      {"turkish",		IDX_ISO_9}, // ?
      {"latin6",		IDX_ISO_10},
      {"nordic",		IDX_ISO_10}, // ?
      {"thai",		IDX_ISO_11}, // ?
      {"latin7",		IDX_ISO_13},
      {"latin8",		IDX_ISO_14},
      {"latin9",		IDX_ISO_15},
      {"utf8",		IDX_UTF8},
      {"unicode",		IDX_UCS2},
      {"ucs2",		IDX_UCS2},
      {"ucs2be",		IDX_UCS2},
      {"ucs-2be",		IDX_UCS2},
      {"ucs2le",		IDX_UCS2LE},
      {"utf16",		IDX_UTF16},
      {"utf16be",		IDX_UTF16},
      {"utf-16be",	IDX_UTF16},
      {"utf16le",		IDX_UTF16LE},
      {"ucs4",		IDX_UCS4},
      {"ucs4be",		IDX_UCS4},
      {"ucs-4be",		IDX_UCS4},
      {"ucs4le",		IDX_UCS4LE},
      {"utf32",		IDX_UCS4},
      {"utf-32",		IDX_UCS4},
      {"utf32be",		IDX_UCS4},
      {"utf-32be",	IDX_UCS4},
      {"utf32le",		IDX_UCS4LE},
      {"utf-32le",	IDX_UCS4LE},
      {"932",		IDX_CP932},
      {"949",		IDX_CP949},
      {"936",		IDX_CP936},
      {"gbk",		IDX_CP936},
      {"950",		IDX_CP950},
      {"eucjp",		IDX_EUC_JP},
      {"unix-jis",	IDX_EUC_JP},
      {"ujis",		IDX_EUC_JP},
      {"shift-jis",	IDX_SJIS},
      {"pck",		IDX_SJIS},	// Sun: PCK
      {"euckr",		IDX_EUC_KR},
      {"5601",		IDX_EUC_KR},	// Sun: KS C 5601
      {"euccn",		IDX_EUC_CN},
      {"gb2312",		IDX_EUC_CN},
      {"euctw",		IDX_EUC_TW},
  #if defined(MSWIN) || defined(WIN32UNIX) || defined(MACOS_X)
      {"japan",		IDX_CP932},
      {"korea",		IDX_CP949},
      {"prc",		IDX_CP936},
      {"chinese",		IDX_CP936},
      {"taiwan",		IDX_CP950},
      {"big5",		IDX_CP950},
  #else
      {"japan",		IDX_EUC_JP},
      {"korea",		IDX_EUC_KR},
      {"prc",		IDX_EUC_CN},
      {"chinese",		IDX_EUC_CN},
      {"taiwan",		IDX_EUC_TW},
      {"cp950",		IDX_BIG5},
      {"950",		IDX_BIG5},
  #endif
      {"mac",		IDX_MACROMAN},
      {"mac-roman",	IDX_MACROMAN},
      {NULL,		0}
  };
  
  #ifndef CP_UTF8
  # define CP_UTF8 65001	// magic number from winnls.h
  #endif
  
  /*
   * Find encoding "name" in the list of canonical encoding names.
   * Returns -1 if not found.
   */
      static int
  enc_canon_search(char_u *name)
  {
      int		i;
  
      for (i = 0; i < IDX_COUNT; ++i)
  	if (STRCMP(name, enc_canon_table[i].name) == 0)
  	    return i;
      return -1;
  }
  
  
  /*
   * Find canonical encoding "name" in the list and return its properties.
   * Returns 0 if not found.
   */
      int
  enc_canon_props(char_u *name)
  {
      int		i;
  
      i = enc_canon_search(name);
      if (i >= 0)
  	return enc_canon_table[i].prop;
  #ifdef MSWIN
      if (name[0] == 'c' && name[1] == 'p' && VIM_ISDIGIT(name[2]))
      {
  	CPINFO	cpinfo;
  
  	// Get info on this codepage to find out what it is.
  	if (GetCPInfo(atoi((char *)name + 2), &cpinfo) != 0)
  	{
  	    if (cpinfo.MaxCharSize == 1) // some single-byte encoding
  		return ENC_8BIT;
  	    if (cpinfo.MaxCharSize == 2
  		    && (cpinfo.LeadByte[0] != 0 || cpinfo.LeadByte[1] != 0))
  		// must be a DBCS encoding
  		return ENC_DBCS;
  	}
  	return 0;
      }
  #endif
      if (STRNCMP(name, "2byte-", 6) == 0)
  	return ENC_DBCS;
      if (STRNCMP(name, "8bit-", 5) == 0 || STRNCMP(name, "iso-8859-", 9) == 0)
  	return ENC_8BIT;
      return 0;
  }
  
  /*
   * Set up for using multi-byte characters.
   * Called in three cases:
   * - by main() to initialize (p_enc == NULL)
   * - by set_init_1() after 'encoding' was set to its default.
   * - by do_set() when 'encoding' has been set.
   * p_enc must have been passed through enc_canonize() already.
   * Sets the "enc_unicode", "enc_utf8", "enc_dbcs" and "has_mbyte" flags.
   * Fills mb_bytelen_tab[] and returns NULL when there are no problems.
   * When there is something wrong: Returns an error message and doesn't change
   * anything.
   */
      char *
  mb_init(void)
  {
      int		i;
      int		idx;
      int		n;
      int		enc_dbcs_new = 0;
  #if defined(USE_ICONV) && !defined(MSWIN) && !defined(WIN32UNIX) \
  	&& !defined(MACOS_CONVERT)
  # define LEN_FROM_CONV
      vimconv_T	vimconv;
      char_u	*p;
  #endif
  
      if (p_enc == NULL)
      {
  	// Just starting up: set the whole table to one's.
  	for (i = 0; i < 256; ++i)
  	    mb_bytelen_tab[i] = 1;
  	input_conv.vc_type = CONV_NONE;
  	input_conv.vc_factor = 1;
  	output_conv.vc_type = CONV_NONE;
  	return NULL;
      }
  
  #ifdef MSWIN
      if (p_enc[0] == 'c' && p_enc[1] == 'p' && VIM_ISDIGIT(p_enc[2]))
      {
  	CPINFO	cpinfo;
  
  	// Get info on this codepage to find out what it is.
  	if (GetCPInfo(atoi((char *)p_enc + 2), &cpinfo) != 0)
  	{
  	    if (cpinfo.MaxCharSize == 1)
  	    {
  		// some single-byte encoding
  		enc_unicode = 0;
  		enc_utf8 = FALSE;
  	    }
  	    else if (cpinfo.MaxCharSize == 2
  		    && (cpinfo.LeadByte[0] != 0 || cpinfo.LeadByte[1] != 0))
  	    {
  		// must be a DBCS encoding, check below
  		enc_dbcs_new = atoi((char *)p_enc + 2);
  	    }
  	    else
  		goto codepage_invalid;
  	}
  	else if (GetLastError() == ERROR_INVALID_PARAMETER)
  	{
  codepage_invalid:
  	    return N_(e_not_valid_codepage);
  	}
      }
  #endif
      else if (STRNCMP(p_enc, "8bit-", 5) == 0
  	    || STRNCMP(p_enc, "iso-8859-", 9) == 0)
      {
  	// Accept any "8bit-" or "iso-8859-" name.
  	enc_unicode = 0;
  	enc_utf8 = FALSE;
      }
      else if (STRNCMP(p_enc, "2byte-", 6) == 0)
      {
  #ifdef MSWIN
  	// Windows: accept only valid codepage numbers, check below.
  	if (p_enc[6] != 'c' || p_enc[7] != 'p'
  			      || (enc_dbcs_new = atoi((char *)p_enc + 8)) == 0)
  	    return e_invalid_argument;
  #else
  	// Unix: accept any "2byte-" name, assume current locale.
  	enc_dbcs_new = DBCS_2BYTE;
  #endif
      }
      else if ((idx = enc_canon_search(p_enc)) >= 0)
      {
  	i = enc_canon_table[idx].prop;
  	if (i & ENC_UNICODE)
  	{
  	    // Unicode
  	    enc_utf8 = TRUE;
  	    if (i & (ENC_2BYTE | ENC_2WORD))
  		enc_unicode = 2;
  	    else if (i & ENC_4BYTE)
  		enc_unicode = 4;
  	    else
  		enc_unicode = 0;
  	}
  	else if (i & ENC_DBCS)
  	{
  	    // 2byte, handle below
  	    enc_dbcs_new = enc_canon_table[idx].codepage;
  	}
  	else
  	{
  	    // Must be 8-bit.
  	    enc_unicode = 0;
  	    enc_utf8 = FALSE;
  	}
      }
      else    // Don't know what encoding this is, reject it.
  	return e_invalid_argument;
  
      if (enc_dbcs_new != 0)
      {
  #ifdef MSWIN
  	// Check if the DBCS code page is OK.
  	if (!IsValidCodePage(enc_dbcs_new))
  	    goto codepage_invalid;
  #endif
  	enc_unicode = 0;
  	enc_utf8 = FALSE;
      }
      enc_dbcs = enc_dbcs_new;
      has_mbyte = (enc_dbcs != 0 || enc_utf8);
  
  #if defined(MSWIN) || defined(FEAT_CYGWIN_WIN32_CLIPBOARD)
      enc_codepage = encname2codepage(p_enc);
      enc_latin9 = (STRCMP(p_enc, "iso-8859-15") == 0);
  #endif
  
      // Detect an encoding that uses latin1 characters.
      enc_latin1like = (enc_utf8 || STRCMP(p_enc, "latin1") == 0
  					|| STRCMP(p_enc, "iso-8859-15") == 0);
  
      /*
       * Set the function pointers.
       */
      if (enc_utf8)
      {
  	mb_ptr2len = utfc_ptr2len;
  	mb_ptr2len_len = utfc_ptr2len_len;
  	mb_char2len = utf_char2len;
  	mb_char2bytes = utf_char2bytes;
  	mb_ptr2cells = utf_ptr2cells;
  	mb_ptr2cells_len = utf_ptr2cells_len;
  	mb_char2cells = utf_char2cells;
  	mb_off2cells = utf_off2cells;
  	mb_ptr2char = utf_ptr2char;
  	mb_head_off = utf_head_off;
      }
      else if (enc_dbcs != 0)
      {
  	mb_ptr2len = dbcs_ptr2len;
  	mb_ptr2len_len = dbcs_ptr2len_len;
  	mb_char2len = dbcs_char2len;
  	mb_char2bytes = dbcs_char2bytes;
  	mb_ptr2cells = dbcs_ptr2cells;
  	mb_ptr2cells_len = dbcs_ptr2cells_len;
  	mb_char2cells = dbcs_char2cells;
  	mb_off2cells = dbcs_off2cells;
  	mb_ptr2char = dbcs_ptr2char;
  	mb_head_off = dbcs_head_off;
      }
      else
      {
  	mb_ptr2len = latin_ptr2len;
  	mb_ptr2len_len = latin_ptr2len_len;
  	mb_char2len = latin_char2len;
  	mb_char2bytes = latin_char2bytes;
  	mb_ptr2cells = latin_ptr2cells;
  	mb_ptr2cells_len = latin_ptr2cells_len;
  	mb_char2cells = latin_char2cells;
  	mb_off2cells = latin_off2cells;
  	mb_ptr2char = latin_ptr2char;
  	mb_head_off = latin_head_off;
      }
  
      /*
       * Fill the mb_bytelen_tab[] for MB_BYTE2LEN().
       */
  #ifdef LEN_FROM_CONV
      // When 'encoding' is different from the current locale mblen() won't
      // work.  Use conversion to "utf-8" instead.
      vimconv.vc_type = CONV_NONE;
      if (enc_dbcs)
      {
  	p = enc_locale();
  	if (p == NULL || STRCMP(p, p_enc) != 0)
  	{
  	    convert_setup(&vimconv, p_enc, (char_u *)"utf-8");
  	    vimconv.vc_fail = TRUE;
  	}
  	vim_free(p);
      }
  #endif
  
      for (i = 0; i < 256; ++i)
      {
  	// Our own function to reliably check the length of UTF-8 characters,
  	// independent of mblen().
  	if (enc_utf8)
  	    n = utf8len_tab[i];
  	else if (enc_dbcs == 0)
  	    n = 1;
  	else
  	{
  #if defined(MSWIN) || defined(WIN32UNIX)
  	    // enc_dbcs is set by setting 'fileencoding'.  It becomes a Windows
  	    // CodePage identifier, which we can pass directly in to Windows
  	    // API
  	    n = IsDBCSLeadByteEx(enc_dbcs, (WINBYTE)i) ? 2 : 1;
  #else
  # if defined(__amigaos4__) || defined(__ANDROID__) || \
  				   !(defined(HAVE_MBLEN) || defined(X_LOCALE))
  	    /*
  	     * if mblen() is not available, character which MSB is turned on
  	     * are treated as leading byte character. (note : This assumption
  	     * is not always true.)
  	     */
  	    n = (i & 0x80) ? 2 : 1;
  # else
  	    char buf[MB_MAXBYTES + 1];
  
  	    if (i == NUL)	// just in case mblen() can't handle ""
  		n = 1;
  	    else
  	    {
  		buf[0] = i;
  		buf[1] = 0;
  #  ifdef LEN_FROM_CONV
  		if (vimconv.vc_type != CONV_NONE)
  		{
  		    /*
  		     * string_convert() should fail when converting the first
  		     * byte of a double-byte character.
  		     */
  		    p = string_convert(&vimconv, (char_u *)buf, NULL);
  		    if (p != NULL)
  		    {
  			vim_free(p);
  			n = 1;
  		    }
  		    else
  			n = 2;
  		}
  		else
  #  endif
  		{
  		    /*
  		     * mblen() should return -1 for invalid (means the leading
  		     * multibyte) character.  However there are some platforms
  		     * where mblen() returns 0 for invalid character.
  		     * Therefore, following condition includes 0.
  		     */
  		    vim_ignored = mblen(NULL, 0);  // First reset the state.
  		    if (mblen(buf, (size_t)1) <= 0)
  			n = 2;
  		    else
  			n = 1;
  		}
  	    }
  # endif
  #endif
  	}
  
  	mb_bytelen_tab[i] = n;
      }
  
  #ifdef LEN_FROM_CONV
      convert_setup(&vimconv, NULL, NULL);
  #endif
  
      // The cell width depends on the type of multi-byte characters.
      (void)init_chartab();
  
      // When enc_utf8 is set or reset, (de)allocate ScreenLinesUC[]
      screenalloc(FALSE);
  
      // When using Unicode, set default for 'fileencodings'.
      if (enc_utf8 && !option_was_set((char_u *)"fencs"))
  	set_fencs_unicode();
  
  #if defined(HAVE_BIND_TEXTDOMAIN_CODESET) && defined(FEAT_GETTEXT)
      // GNU gettext 0.10.37 supports this feature: set the codeset used for
      // translated messages independently from the current locale.
      (void)bind_textdomain_codeset(VIMPACKAGE,
  					  enc_utf8 ? "utf-8" : (char *)p_enc);
  #endif
  
  #ifdef MSWIN
      // When changing 'encoding' while starting up, then convert the command
      // line arguments from the active codepage to 'encoding'.
      if (starting != 0)
  	fix_arg_enc();
  #endif
  
      // Fire an autocommand to let people do custom font setup. This must be
      // after Vim has been setup for the new encoding.
      apply_autocmds(EVENT_ENCODINGCHANGED, NULL, (char_u *)"", FALSE, curbuf);
  
  #ifdef FEAT_SPELL
      // Need to reload spell dictionaries
      spell_reload();
  #endif
  
      return NULL;
  }
  
  /*
   * Return the size of the BOM for the current buffer:
   * 0 - no BOM
   * 2 - UCS-2 or UTF-16 BOM
   * 4 - UCS-4 BOM
   * 3 - UTF-8 BOM
   */
      int
  bomb_size(void)
  {
      int n = 0;
  
      if (curbuf->b_p_bomb && !curbuf->b_p_bin)
      {
  	if (*curbuf->b_p_fenc == NUL)
  	{
  	    if (enc_utf8)
  	    {
  		if (enc_unicode != 0)
  		    n = enc_unicode;
  		else
  		    n = 3;
  	    }
  	}
  	else if (STRCMP(curbuf->b_p_fenc, "utf-8") == 0)
  	    n = 3;
  	else if (STRNCMP(curbuf->b_p_fenc, "ucs-2", 5) == 0
  		|| STRNCMP(curbuf->b_p_fenc, "utf-16", 6) == 0)
  	    n = 2;
  	else if (STRNCMP(curbuf->b_p_fenc, "ucs-4", 5) == 0)
  	    n = 4;
      }
      return n;
  }
  
  #if defined(FEAT_QUICKFIX) || defined(PROTO)
  /*
   * Remove all BOM from "s" by moving remaining text.
   */
      void
  remove_bom(char_u *s)
  {
      if (enc_utf8)
      {
  	char_u *p = s;
  
  	while ((p = vim_strbyte(p, 0xef)) != NULL)
  	{
  	    if (p[1] == 0xbb && p[2] == 0xbf)
  		STRMOVE(p, p + 3);
  	    else
  		++p;
  	}
      }
  }
  #endif
  
  /*
   * Get class of pointer:
   * 0 for blank or NUL
   * 1 for punctuation
   * 2 for an (ASCII) word character
   * >2 for other word characters
   */
      int
  mb_get_class(char_u *p)
  {
      return mb_get_class_buf(p, curbuf);
  }
  
      int
  mb_get_class_buf(char_u *p, buf_T *buf)
  {
      if (MB_BYTE2LEN(p[0]) == 1)
      {
  	if (p[0] == NUL || VIM_ISWHITE(p[0]))
  	    return 0;
  	if (vim_iswordc_buf(p[0], buf))
  	    return 2;
  	return 1;
      }
      if (enc_dbcs != 0 && p[0] != NUL && p[1] != NUL)
  	return dbcs_class(p[0], p[1]);
      if (enc_utf8)
  	return utf_class_buf(utf_ptr2char(p), buf);
      return 0;
  }
  
  /*
   * Get class of a double-byte character.  This always returns 3 or bigger.
   * TODO: Should return 1 for punctuation.
   */
      int
  dbcs_class(unsigned lead, unsigned trail)
  {
      switch (enc_dbcs)
      {
  	// please add classify routine for your language in here
  
  	case DBCS_JPNU:	// ?
  	case DBCS_JPN:
  	    {
  		// JIS code classification
  		unsigned char lb = lead;
  		unsigned char tb = trail;
  
  		// convert process code to JIS
  # if defined(MSWIN) || defined(WIN32UNIX) || defined(MACOS_X)
  		// process code is SJIS
  		if (lb <= 0x9f)
  		    lb = (lb - 0x81) * 2 + 0x21;
  		else
  		    lb = (lb - 0xc1) * 2 + 0x21;
  		if (tb <= 0x7e)
  		    tb -= 0x1f;
  		else if (tb <= 0x9e)
  		    tb -= 0x20;
  		else
  		{
  		    tb -= 0x7e;
  		    lb += 1;
  		}
  # else
  		/*
  		 * XXX: Code page identification can not use with all
  		 *	    system! So, some other encoding information
  		 *	    will be needed.
  		 *	    In japanese: SJIS,EUC,UNICODE,(JIS)
  		 *	    Note that JIS-code system don't use as
  		 *	    process code in most system because it uses
  		 *	    escape sequences(JIS is context depend encoding).
  		 */
  		// assume process code is JAPANESE-EUC
  		lb &= 0x7f;
  		tb &= 0x7f;
  # endif
  		// exceptions
  		switch (lb << 8 | tb)
  		{
  		    case 0x2121: // ZENKAKU space
  			return 0;
  		    case 0x2122: // TOU-TEN (Japanese comma)
  		    case 0x2123: // KU-TEN (Japanese period)
  		    case 0x2124: // ZENKAKU comma
  		    case 0x2125: // ZENKAKU period
  			return 1;
  		    case 0x213c: // prolongedsound handled as KATAKANA
  			return 13;
  		}
  		// sieved by KU code
  		switch (lb)
  		{
  		    case 0x21:
  		    case 0x22:
  			// special symbols
  			return 10;
  		    case 0x23:
  			// alphanumeric
  			return 11;
  		    case 0x24:
  			// hiragana
  			return 12;
  		    case 0x25:
  			// katakana
  			return 13;
  		    case 0x26:
  			// greek
  			return 14;
  		    case 0x27:
  			// russian
  			return 15;
  		    case 0x28:
  			// lines
  			return 16;
  		    default:
  			// kanji
  			return 17;
  		}
  	    }
  
  	case DBCS_KORU:	// ?
  	case DBCS_KOR:
  	    {
  		// KS code classification
  		unsigned char c1 = lead;
  		unsigned char c2 = trail;
  
  		/*
  		 * 20 : Hangul
  		 * 21 : Hanja
  		 * 22 : Symbols
  		 * 23 : Alphanumeric/Roman Letter (Full width)
  		 * 24 : Hangul Letter(Alphabet)
  		 * 25 : Roman Numeral/Greek Letter
  		 * 26 : Box Drawings
  		 * 27 : Unit Symbols
  		 * 28 : Circled/Parenthesized Letter
  		 * 29 : Hiragana/Katakana
  		 * 30 : Cyrillic Letter
  		 */
  
  		if (c1 >= 0xB0 && c1 <= 0xC8)
  		    // Hangul
  		    return 20;
  #if defined(MSWIN) || defined(WIN32UNIX)
  		else if (c1 <= 0xA0 || c2 <= 0xA0)
  		    // Extended Hangul Region : MS UHC(Unified Hangul Code)
  		    // c1: 0x81-0xA0 with c2: 0x41-0x5A, 0x61-0x7A, 0x81-0xFE
  		    // c1: 0xA1-0xC6 with c2: 0x41-0x5A, 0x61-0x7A, 0x81-0xA0
  		    return 20;
  #endif
  
  		else if (c1 >= 0xCA && c1 <= 0xFD)
  		    // Hanja
  		    return 21;
  		else switch (c1)
  		{
  		    case 0xA1:
  		    case 0xA2:
  			// Symbols
  			return 22;
  		    case 0xA3:
  			// Alphanumeric
  			return 23;
  		    case 0xA4:
  			// Hangul Letter(Alphabet)
  			return 24;
  		    case 0xA5:
  			// Roman Numeral/Greek Letter
  			return 25;
  		    case 0xA6:
  			// Box Drawings
  			return 26;
  		    case 0xA7:
  			// Unit Symbols
  			return 27;
  		    case 0xA8:
  		    case 0xA9:
  			if (c2 <= 0xAF)
  			    return 25;  // Roman Letter
  			else if (c2 >= 0xF6)
  			    return 22;  // Symbols
  			else
  			    // Circled/Parenthesized Letter
  			    return 28;
  		    case 0xAA:
  		    case 0xAB:
  			// Hiragana/Katakana
  			return 29;
  		    case 0xAC:
  			// Cyrillic Letter
  			return 30;
  		}
  	    }
  	default:
  	    break;
      }
      return 3;
  }
  
  /*
   * mb_char2len() function pointer.
   * Return length in bytes of character "c".
   * Returns 1 for a single-byte character.
   */
      int
  latin_char2len(int c UNUSED)
  {
      return 1;
  }
  
      static int
  dbcs_char2len(
      int		c)
  {
      if (c >= 0x100)
  	return 2;
      return 1;
  }
  
  /*
   * mb_char2bytes() function pointer.
   * Convert a character to its bytes.
   * Returns the length in bytes.
   */
      int
  latin_char2bytes(int c, char_u *buf)
  {
      buf[0] = c;
      return 1;
  }
  
      static int
  dbcs_char2bytes(int c, char_u *buf)
  {
      if (c >= 0x100)
      {
  	buf[0] = (unsigned)c >> 8;
  	buf[1] = c;
  	// Never use a NUL byte, it causes lots of trouble.  It's an invalid
  	// character anyway.
  	if (buf[1] == NUL)
  	    buf[1] = '\n';
  	return 2;
      }
      buf[0] = c;
      return 1;
  }
  
  /*
   * mb_ptr2len() function pointer.
   * Get byte length of character at "*p" but stop at a NUL.
   * For UTF-8 this includes following composing characters.
   * Returns 0 when *p is NUL.
   */
      int
  latin_ptr2len(char_u *p)
  {
   return MB_BYTE2LEN(*p);
  }
  
      static int
  dbcs_ptr2len(
      char_u	*p)
  {
      int		len;
  
      // Check if second byte is not missing.
      len = MB_BYTE2LEN(*p);
      if (len == 2 && p[1] == NUL)
  	len = 1;
      return len;
  }
  
  /*
   * mb_ptr2len_len() function pointer.
   * Like mb_ptr2len(), but limit to read "size" bytes.
   * Returns 0 for an empty string.
   * Returns 1 for an illegal char or an incomplete byte sequence.
   */
      int
  latin_ptr2len_len(char_u *p, int size)
  {
      if (size < 1 || *p == NUL)
  	return 0;
      return 1;
  }
  
      static int
  dbcs_ptr2len_len(char_u *p, int size)
  {
      int		len;
  
      if (size < 1 || *p == NUL)
  	return 0;
      if (size == 1)
  	return 1;
      // Check that second byte is not missing.
      len = MB_BYTE2LEN(*p);
      if (len == 2 && p[1] == NUL)
  	len = 1;
      return len;
  }
  
  struct interval
  {
      long first;
      long last;
  };
  
  /*
   * Return TRUE if "c" is in "table[size / sizeof(struct interval)]".
   */
      static int
  intable(struct interval *table, size_t size, int c)
  {
      int mid, bot, top;
  
      // first quick check for Latin1 etc. characters
      if (c < table[0].first)
  	return FALSE;
  
      // binary search in table
      bot = 0;
      top = (int)(size / sizeof(struct interval) - 1);
      while (top >= bot)
      {
  	mid = (bot + top) / 2;
  	if (table[mid].last < c)
  	    bot = mid + 1;
  	else if (table[mid].first > c)
  	    top = mid - 1;
  	else
  	    return TRUE;
      }
      return FALSE;
  }
  
  // Sorted list of non-overlapping intervals of East Asian Ambiguous
  // characters, generated with ../runtime/tools/unicode.vim.
  static struct interval ambiguous[] =
  {
      {0x00a1, 0x00a1},
      {0x00a4, 0x00a4},
      {0x00a7, 0x00a8},
      {0x00aa, 0x00aa},
      {0x00ad, 0x00ae},
      {0x00b0, 0x00b4},
      {0x00b6, 0x00ba},
      {0x00bc, 0x00bf},
      {0x00c6, 0x00c6},
      {0x00d0, 0x00d0},
      {0x00d7, 0x00d8},
      {0x00de, 0x00e1},
      {0x00e6, 0x00e6},
      {0x00e8, 0x00ea},
      {0x00ec, 0x00ed},
      {0x00f0, 0x00f0},
      {0x00f2, 0x00f3},
      {0x00f7, 0x00fa},
      {0x00fc, 0x00fc},
      {0x00fe, 0x00fe},
      {0x0101, 0x0101},
      {0x0111, 0x0111},
      {0x0113, 0x0113},
      {0x011b, 0x011b},
      {0x0126, 0x0127},
      {0x012b, 0x012b},
      {0x0131, 0x0133},
      {0x0138, 0x0138},
      {0x013f, 0x0142},
      {0x0144, 0x0144},
      {0x0148, 0x014b},
      {0x014d, 0x014d},
      {0x0152, 0x0153},
      {0x0166, 0x0167},
      {0x016b, 0x016b},
      {0x01ce, 0x01ce},
      {0x01d0, 0x01d0},
      {0x01d2, 0x01d2},
      {0x01d4, 0x01d4},
      {0x01d6, 0x01d6},
      {0x01d8, 0x01d8},
      {0x01da, 0x01da},
      {0x01dc, 0x01dc},
      {0x0251, 0x0251},
      {0x0261, 0x0261},
      {0x02c4, 0x02c4},
      {0x02c7, 0x02c7},
      {0x02c9, 0x02cb},
      {0x02cd, 0x02cd},
      {0x02d0, 0x02d0},
      {0x02d8, 0x02db},
      {0x02dd, 0x02dd},
      {0x02df, 0x02df},
      {0x0300, 0x036f},
      {0x0391, 0x03a1},
      {0x03a3, 0x03a9},
      {0x03b1, 0x03c1},
      {0x03c3, 0x03c9},
      {0x0401, 0x0401},
      {0x0410, 0x044f},
      {0x0451, 0x0451},
      {0x2010, 0x2010},
      {0x2013, 0x2016},
      {0x2018, 0x2019},
      {0x201c, 0x201d},
      {0x2020, 0x2022},
      {0x2024, 0x2027},
      {0x2030, 0x2030},
      {0x2032, 0x2033},
      {0x2035, 0x2035},
      {0x203b, 0x203b},
      {0x203e, 0x203e},
      {0x2074, 0x2074},
      {0x207f, 0x207f},
      {0x2081, 0x2084},
      {0x20ac, 0x20ac},
      {0x2103, 0x2103},
      {0x2105, 0x2105},
      {0x2109, 0x2109},
      {0x2113, 0x2113},
      {0x2116, 0x2116},
      {0x2121, 0x2122},
      {0x2126, 0x2126},
      {0x212b, 0x212b},
      {0x2153, 0x2154},
      {0x215b, 0x215e},
      {0x2160, 0x216b},
      {0x2170, 0x2179},
      {0x2189, 0x2189},
      {0x2190, 0x2199},
      {0x21b8, 0x21b9},
      {0x21d2, 0x21d2},
      {0x21d4, 0x21d4},
      {0x21e7, 0x21e7},
      {0x2200, 0x2200},
      {0x2202, 0x2203},
      {0x2207, 0x2208},
      {0x220b, 0x220b},
      {0x220f, 0x220f},
      {0x2211, 0x2211},
      {0x2215, 0x2215},
      {0x221a, 0x221a},
      {0x221d, 0x2220},
      {0x2223, 0x2223},
      {0x2225, 0x2225},
      {0x2227, 0x222c},
      {0x222e, 0x222e},
      {0x2234, 0x2237},
      {0x223c, 0x223d},
      {0x2248, 0x2248},
      {0x224c, 0x224c},
      {0x2252, 0x2252},
      {0x2260, 0x2261},
      {0x2264, 0x2267},
      {0x226a, 0x226b},
      {0x226e, 0x226f},
      {0x2282, 0x2283},
      {0x2286, 0x2287},
      {0x2295, 0x2295},
      {0x2299, 0x2299},
      {0x22a5, 0x22a5},
      {0x22bf, 0x22bf},
      {0x2312, 0x2312},
      {0x2460, 0x24e9},
      {0x24eb, 0x254b},
      {0x2550, 0x2573},
      {0x2580, 0x258f},
      {0x2592, 0x2595},
      {0x25a0, 0x25a1},
      {0x25a3, 0x25a9},
      {0x25b2, 0x25b3},
      {0x25b6, 0x25b7},
      {0x25bc, 0x25bd},
      {0x25c0, 0x25c1},
      {0x25c6, 0x25c8},
      {0x25cb, 0x25cb},
      {0x25ce, 0x25d1},
      {0x25e2, 0x25e5},
      {0x25ef, 0x25ef},
      {0x2605, 0x2606},
      {0x2609, 0x2609},
      {0x260e, 0x260f},
      {0x261c, 0x261c},
      {0x261e, 0x261e},
      {0x2640, 0x2640},
      {0x2642, 0x2642},
      {0x2660, 0x2661},
      {0x2663, 0x2665},
      {0x2667, 0x266a},
      {0x266c, 0x266d},
      {0x266f, 0x266f},
      {0x269e, 0x269f},
      {0x26bf, 0x26bf},
      {0x26c6, 0x26cd},
      {0x26cf, 0x26d3},
      {0x26d5, 0x26e1},
      {0x26e3, 0x26e3},
      {0x26e8, 0x26e9},
      {0x26eb, 0x26f1},
      {0x26f4, 0x26f4},
      {0x26f6, 0x26f9},
      {0x26fb, 0x26fc},
      {0x26fe, 0x26ff},
      {0x273d, 0x273d},
      {0x2776, 0x277f},
      {0x2b56, 0x2b59},
      {0x3248, 0x324f},
      {0xe000, 0xf8ff},
      {0xfe00, 0xfe0f},
      {0xfffd, 0xfffd},
      {0x1f100, 0x1f10a},
      {0x1f110, 0x1f12d},
      {0x1f130, 0x1f169},
      {0x1f170, 0x1f18d},
      {0x1f18f, 0x1f190},
      {0x1f19b, 0x1f1ac},
      {0xe0100, 0xe01ef},
      {0xf0000, 0xffffd},
      {0x100000, 0x10fffd}
  };
  
  #if defined(FEAT_TERMINAL) || defined(PROTO)
  /*
   * utf_char2cells() with different argument type for libvterm.
   */
      int
  utf_uint2cells(UINT32_T c)
  {
      if (c >= 0x100 && utf_iscomposing((int)c))
  	return 0;
      return utf_char2cells((int)c);
  }
  #endif
  
  /*
   * For UTF-8 character "c" return 2 for a double-width character, 1 for others.
   * Returns 4 or 6 for an unprintable character.
   * Is only correct for characters >= 0x80.
   * When p_ambw is "double", return 2 for a character with East Asian Width
   * class 'A'(mbiguous).
   */
      int
  utf_char2cells(int c)
  {
      // Sorted list of non-overlapping intervals of East Asian double width
      // characters, generated with ../runtime/tools/unicode.vim.
      static struct interval doublewidth[] =
      {
  	{0x1100, 0x115f},
  	{0x231a, 0x231b},
  	{0x2329, 0x232a},
  	{0x23e9, 0x23ec},
  	{0x23f0, 0x23f0},
  	{0x23f3, 0x23f3},
  	{0x25fd, 0x25fe},
  	{0x2614, 0x2615},
  	{0x2648, 0x2653},
  	{0x267f, 0x267f},
  	{0x2693, 0x2693},
  	{0x26a1, 0x26a1},
  	{0x26aa, 0x26ab},
  	{0x26bd, 0x26be},
  	{0x26c4, 0x26c5},
  	{0x26ce, 0x26ce},
  	{0x26d4, 0x26d4},
  	{0x26ea, 0x26ea},
  	{0x26f2, 0x26f3},
  	{0x26f5, 0x26f5},
  	{0x26fa, 0x26fa},
  	{0x26fd, 0x26fd},
  	{0x2705, 0x2705},
  	{0x270a, 0x270b},
  	{0x2728, 0x2728},
  	{0x274c, 0x274c},
  	{0x274e, 0x274e},
  	{0x2753, 0x2755},
  	{0x2757, 0x2757},
  	{0x2795, 0x2797},
  	{0x27b0, 0x27b0},
  	{0x27bf, 0x27bf},
  	{0x2b1b, 0x2b1c},
  	{0x2b50, 0x2b50},
  	{0x2b55, 0x2b55},
  	{0x2e80, 0x2e99},
  	{0x2e9b, 0x2ef3},
  	{0x2f00, 0x2fd5},
  	{0x2ff0, 0x2ffb},
  	{0x3000, 0x303e},
  	{0x3041, 0x3096},
  	{0x3099, 0x30ff},
  	{0x3105, 0x312f},
  	{0x3131, 0x318e},
  	{0x3190, 0x31e3},
  	{0x31f0, 0x321e},
  	{0x3220, 0x3247},
  	{0x3250, 0x4dbf},
  	{0x4e00, 0xa48c},
  	{0xa490, 0xa4c6},
  	{0xa960, 0xa97c},
  	{0xac00, 0xd7a3},
  	{0xf900, 0xfaff},
  	{0xfe10, 0xfe19},
  	{0xfe30, 0xfe52},
  	{0xfe54, 0xfe66},
  	{0xfe68, 0xfe6b},
  	{0xff01, 0xff60},
  	{0xffe0, 0xffe6},
  	{0x16fe0, 0x16fe3},
  	{0x16ff0, 0x16ff1},
  	{0x17000, 0x187f7},
  	{0x18800, 0x18cd5},
  	{0x18d00, 0x18d08},
  	{0x1b000, 0x1b11e},
  	{0x1b150, 0x1b152},
  	{0x1b164, 0x1b167},
  	{0x1b170, 0x1b2fb},
  	{0x1f004, 0x1f004},
  	{0x1f0cf, 0x1f0cf},
  	{0x1f18e, 0x1f18e},
  	{0x1f191, 0x1f19a},
  	{0x1f200, 0x1f202},
  	{0x1f210, 0x1f23b},
  	{0x1f240, 0x1f248},
  	{0x1f250, 0x1f251},
  	{0x1f260, 0x1f265},
  	{0x1f300, 0x1f320},
  	{0x1f32d, 0x1f335},
  	{0x1f337, 0x1f37c},
  	{0x1f37e, 0x1f393},
  	{0x1f3a0, 0x1f3ca},
  	{0x1f3cf, 0x1f3d3},
  	{0x1f3e0, 0x1f3f0},
  	{0x1f3f4, 0x1f3f4},
  	{0x1f3f8, 0x1f43e},
  	{0x1f440, 0x1f440},
  	{0x1f442, 0x1f4fc},
  	{0x1f4ff, 0x1f53d},
  	{0x1f54b, 0x1f54e},
  	{0x1f550, 0x1f567},
  	{0x1f57a, 0x1f57a},
  	{0x1f595, 0x1f596},
  	{0x1f5a4, 0x1f5a4},
  	{0x1f5fb, 0x1f64f},
  	{0x1f680, 0x1f6c5},
  	{0x1f6cc, 0x1f6cc},
  	{0x1f6d0, 0x1f6d2},
  	{0x1f6d5, 0x1f6d7},
  	{0x1f6eb, 0x1f6ec},
  	{0x1f6f4, 0x1f6fc},
  	{0x1f7e0, 0x1f7eb},
  	{0x1f90c, 0x1f93a},
  	{0x1f93c, 0x1f945},
  	{0x1f947, 0x1f978},
  	{0x1f97a, 0x1f9cb},
  	{0x1f9cd, 0x1f9ff},
  	{0x1fa70, 0x1fa74},
  	{0x1fa78, 0x1fa7a},
  	{0x1fa80, 0x1fa86},
  	{0x1fa90, 0x1faa8},
  	{0x1fab0, 0x1fab6},
  	{0x1fac0, 0x1fac2},
  	{0x1fad0, 0x1fad6},
  	{0x20000, 0x2fffd},
  	{0x30000, 0x3fffd}
      };
  
      // Sorted list of non-overlapping intervals of Emoji characters that don't
      // have ambiguous or double width,
      // based on http://unicode.org/emoji/charts/emoji-list.html
      static struct interval emoji_wide[] =
      {
  	{0x23ed, 0x23ef},
  	{0x23f1, 0x23f2},
  	{0x23f8, 0x23fa},
  	{0x24c2, 0x24c2},
  	{0x261d, 0x261d},
  	{0x26c8, 0x26c8},
  	{0x26cf, 0x26cf},
  	{0x26d1, 0x26d1},
  	{0x26d3, 0x26d3},
  	{0x26e9, 0x26e9},
  	{0x26f0, 0x26f1},
  	{0x26f7, 0x26f9},
  	{0x270c, 0x270d},
  	{0x2934, 0x2935},
  	{0x1f170, 0x1f189},
  	{0x1f1e6, 0x1f1ff},
  	{0x1f321, 0x1f321},
  	{0x1f324, 0x1f32c},
  	{0x1f336, 0x1f336},
  	{0x1f37d, 0x1f37d},
  	{0x1f396, 0x1f397},
  	{0x1f399, 0x1f39b},
  	{0x1f39e, 0x1f39f},
  	{0x1f3cb, 0x1f3ce},
  	{0x1f3d4, 0x1f3df},
  	{0x1f3f3, 0x1f3f5},
  	{0x1f3f7, 0x1f3f7},
  	{0x1f43f, 0x1f43f},
  	{0x1f441, 0x1f441},
  	{0x1f4fd, 0x1f4fd},
  	{0x1f549, 0x1f54a},
  	{0x1f56f, 0x1f570},
  	{0x1f573, 0x1f579},
  	{0x1f587, 0x1f587},
  	{0x1f58a, 0x1f58d},
  	{0x1f590, 0x1f590},
  	{0x1f5a5, 0x1f5a5},
  	{0x1f5a8, 0x1f5a8},
  	{0x1f5b1, 0x1f5b2},
  	{0x1f5bc, 0x1f5bc},
  	{0x1f5c2, 0x1f5c4},
  	{0x1f5d1, 0x1f5d3},
  	{0x1f5dc, 0x1f5de},
  	{0x1f5e1, 0x1f5e1},
  	{0x1f5e3, 0x1f5e3},
  	{0x1f5e8, 0x1f5e8},
  	{0x1f5ef, 0x1f5ef},
  	{0x1f5f3, 0x1f5f3},
  	{0x1f5fa, 0x1f5fa},
  	{0x1f6cb, 0x1f6cf},
  	{0x1f6e0, 0x1f6e5},
  	{0x1f6e9, 0x1f6e9},
  	{0x1f6f0, 0x1f6f0},
  	{0x1f6f3, 0x1f6f3}
  
  #ifdef MACOS_X
  	// Include SF Symbols characters, which should be rendered as
  	// double-width. All of them are in the Supplementary Private Use
  	// Area-B range. The exact range was determined by downloading the "SF
  	// Symbols" app from Apple, and then selecting all symbols, copying
  	// them out, and inspecting the unicode values of them.
  	, {0x100000, 0x100d7f}
  #endif
      };
  
      if (c >= 0x100)
      {
  #if defined(FEAT_EVAL) || defined(USE_WCHAR_FUNCTIONS)
  	int	n;
  #endif
  
  #ifdef FEAT_EVAL
  	n = cw_value(c);
  	if (n != 0)
  	    return n;
  #endif
  
  #ifdef USE_WCHAR_FUNCTIONS
  	/*
  	 * Assume the library function wcwidth() works better than our own
  	 * stuff.  It should return 1 for ambiguous width chars!
  	 */
  	n = wcwidth(c);
  
  	if (n < 0)
  	    return 6;		// unprintable, displays <xxxx>
  	if (n > 1)
  	    return n;
  #else
  	if (!utf_printable(c))
  	    return 6;		// unprintable, displays <xxxx>
  	if (intable(doublewidth, sizeof(doublewidth), c))
  	    return 2;
  #endif
  	if (p_emoji && intable(emoji_wide, sizeof(emoji_wide), c))
  	    return 2;
      }
  
      // Characters below 0x100 are influenced by 'isprint' option
      else if (c >= 0x80 && !vim_isprintc(c))
  	return 4;		// unprintable, displays <xx>
  
      if (c >= 0x80 && *p_ambw == 'd' && intable(ambiguous, sizeof(ambiguous), c))
  	return 2;
  
      return 1;
  }
  
  /*
   * mb_ptr2cells() function pointer.
   * Return the number of display cells character at "*p" occupies.
   * This doesn't take care of unprintable characters, use ptr2cells() for that.
   */
      int
  latin_ptr2cells(char_u *p UNUSED)
  {
      return 1;
  }
  
      int
  utf_ptr2cells(
      char_u	*p)
  {
      int		c;
  
      // Need to convert to a character number.
      if (*p >= 0x80)
      {
  	c = utf_ptr2char(p);
  	// An illegal byte is displayed as <xx>.
  	if (utf_ptr2len(p) == 1 || c == NUL)
  	    return 4;
  	// If the char is ASCII it must be an overlong sequence.
  	if (c < 0x80)
  	    return char2cells(c);
  	return utf_char2cells(c);
      }
      return 1;
  }
  
      int
  dbcs_ptr2cells(char_u *p)
  {
      // Number of cells is equal to number of bytes, except for euc-jp when
      // the first byte is 0x8e.
      if (enc_dbcs == DBCS_JPNU && *p == 0x8e)
  	return 1;
      return MB_BYTE2LEN(*p);
  }
  
  /*
   * mb_ptr2cells_len() function pointer.
   * Like mb_ptr2cells(), but limit string length to "size".
   * For an empty string or truncated character returns 1.
   */
      int
  latin_ptr2cells_len(char_u *p UNUSED, int size UNUSED)
  {
      return 1;
  }
  
      static int
  utf_ptr2cells_len(char_u *p, int size)
  {
      int		c;
  
      // Need to convert to a wide character.
      if (size > 0 && *p >= 0x80)
      {
  	if (utf_ptr2len_len(p, size) < utf8len_tab[*p])
  	    return 1;  // truncated
  	c = utf_ptr2char(p);
  	// An illegal byte is displayed as <xx>.
  	if (utf_ptr2len(p) == 1 || c == NUL)
  	    return 4;
  	// If the char is ASCII it must be an overlong sequence.
  	if (c < 0x80)
  	    return char2cells(c);
  	return utf_char2cells(c);
      }
      return 1;
  }
  
      static int
  dbcs_ptr2cells_len(char_u *p, int size)
  {
      // Number of cells is equal to number of bytes, except for euc-jp when
      // the first byte is 0x8e.
      if (size <= 1 || (enc_dbcs == DBCS_JPNU && *p == 0x8e))
  	return 1;
      return MB_BYTE2LEN(*p);
  }
  
  /*
   * mb_char2cells() function pointer.
   * Return the number of display cells character "c" occupies.
   * Only takes care of multi-byte chars, not "^C" and such.
   */
      int
  latin_char2cells(int c UNUSED)
  {
      return 1;
  }
  
      static int
  dbcs_char2cells(int c)
  {
      // Number of cells is equal to number of bytes, except for euc-jp when
      // the first byte is 0x8e.
      if (enc_dbcs == DBCS_JPNU && ((unsigned)c >> 8) == 0x8e)
  	return 1;
      // use the first byte
      return MB_BYTE2LEN((unsigned)c >> 8);
  }
  
  /*
   * Return the number of cells occupied by string "p".
   * Stop at a NUL character.  When "len" >= 0 stop at character "p[len]".
   */
      int
  mb_string2cells(char_u *p, int len)
  {
      int i;
      int clen = 0;
  
      for (i = 0; (len < 0 || i < len) && p[i] != NUL; i += (*mb_ptr2len)(p + i))
  	clen += (*mb_ptr2cells)(p + i);
      return clen;
  }
  
  /*
   * mb_off2cells() function pointer.
   * Return number of display cells for char at ScreenLines[off].
   * We make sure that the offset used is less than "max_off".
   */
      int
  latin_off2cells(unsigned off UNUSED, unsigned max_off UNUSED)
  {
      return 1;
  }
  
      int
  dbcs_off2cells(unsigned off, unsigned max_off)
  {
      // never check beyond end of the line
      if (off >= max_off)
  	return 1;
  
      // Number of cells is equal to number of bytes, except for euc-jp when
      // the first byte is 0x8e.
      if (enc_dbcs == DBCS_JPNU && ScreenLines[off] == 0x8e)
  	return 1;
      return MB_BYTE2LEN(ScreenLines[off]);
  }
  
      int
  utf_off2cells(unsigned off, unsigned max_off)
  {
      return (off + 1 < max_off && ScreenLines[off + 1] == 0) ? 2 : 1;
  }
  
  /*
   * mb_ptr2char() function pointer.
   * Convert a byte sequence into a character.
   */
      int
  latin_ptr2char(char_u *p)
  {
      return *p;
  }
  
      static int
  dbcs_ptr2char(char_u *p)
  {
      if (MB_BYTE2LEN(*p) > 1 && p[1] != NUL)
  	return (p[0] << 8) + p[1];
      return *p;
  }
  
  /*
   * Convert a UTF-8 byte sequence to a character number.
   * If the sequence is illegal or truncated by a NUL the first byte is
   * returned.
   * For an overlong sequence this may return zero.
   * Does not include composing characters, of course.
   */
      int
  utf_ptr2char(char_u *p)
  {
      int		len;
  
      if (p[0] < 0x80)	// be quick for ASCII
  	return p[0];
  
      len = utf8len_tab_zero[p[0]];
      if (len > 1 && (p[1] & 0xc0) == 0x80)
      {
  	if (len == 2)
  	    return ((p[0] & 0x1f) << 6) + (p[1] & 0x3f);
  	if ((p[2] & 0xc0) == 0x80)
  	{
  	    if (len == 3)
  		return ((p[0] & 0x0f) << 12) + ((p[1] & 0x3f) << 6)
  		    + (p[2] & 0x3f);
  	    if ((p[3] & 0xc0) == 0x80)
  	    {
  		if (len == 4)
  		    return ((p[0] & 0x07) << 18) + ((p[1] & 0x3f) << 12)
  			+ ((p[2] & 0x3f) << 6) + (p[3] & 0x3f);
  		if ((p[4] & 0xc0) == 0x80)
  		{
  		    if (len == 5)
  			return ((p[0] & 0x03) << 24) + ((p[1] & 0x3f) << 18)
  			    + ((p[2] & 0x3f) << 12) + ((p[3] & 0x3f) << 6)
  			    + (p[4] & 0x3f);
  		    if ((p[5] & 0xc0) == 0x80 && len == 6)
  			return ((p[0] & 0x01) << 30) + ((p[1] & 0x3f) << 24)
  			    + ((p[2] & 0x3f) << 18) + ((p[3] & 0x3f) << 12)
  			    + ((p[4] & 0x3f) << 6) + (p[5] & 0x3f);
  		}
  	    }
  	}
      }
      // Illegal value, just return the first byte
      return p[0];
  }
  
  /*
   * Convert a UTF-8 byte sequence to a wide character.
   * String is assumed to be terminated by NUL or after "n" bytes, whichever
   * comes first.
   * The function is safe in the sense that it never accesses memory beyond the
   * first "n" bytes of "s".
   *
   * On success, returns decoded codepoint, advances "s" to the beginning of
   * next character and decreases "n" accordingly.
   *
   * If end of string was reached, returns 0 and, if "n" > 0, advances "s" past
   * NUL byte.
   *
   * If byte sequence is illegal or incomplete, returns -1 and does not advance
   * "s".
   */
      static int
  utf_safe_read_char_adv(char_u **s, size_t *n)
  {
      int		c, k;
  
      if (*n == 0) // end of buffer
  	return 0;
  
      k = utf8len_tab_zero[**s];
  
      if (k == 1)
      {
  	// ASCII character or NUL
  	(*n)--;
  	return *(*s)++;
      }
  
      if ((size_t)k <= *n)
      {
  	// We have a multibyte sequence and it isn't truncated by buffer
  	// limits so utf_ptr2char() is safe to use. Or the first byte is
  	// illegal (k=0), and it's also safe to use utf_ptr2char().
  	c = utf_ptr2char(*s);
  
  	// On failure, utf_ptr2char() returns the first byte, so here we
  	// check equality with the first byte. The only non-ASCII character
  	// which equals the first byte of its own UTF-8 representation is
  	// U+00C3 (UTF-8: 0xC3 0x83), so need to check that special case too.
  	// It's safe even if n=1, else we would have k=2 > n.
  	if (c != (int)(**s) || (c == 0xC3 && (*s)[1] == 0x83))
  	{
  	    // byte sequence was successfully decoded
  	    *s += k;
  	    *n -= k;
  	    return c;
  	}
      }
  
      // byte sequence is incomplete or illegal
      return -1;
  }
  
  /*
   * Get character at **pp and advance *pp to the next character.
   * Note: composing characters are skipped!
   */
      int
  mb_ptr2char_adv(char_u **pp)
  {
      int		c;
  
      c = (*mb_ptr2char)(*pp);
      *pp += (*mb_ptr2len)(*pp);
      return c;
  }
  
  /*
   * Get character at **pp and advance *pp to the next character.
   * Note: composing characters are returned as separate characters.
   */
      int
  mb_cptr2char_adv(char_u **pp)
  {
      int		c;
  
      c = (*mb_ptr2char)(*pp);
      if (enc_utf8)
  	*pp += utf_ptr2len(*pp);
      else
  	*pp += (*mb_ptr2len)(*pp);
      return c;
  }
  
  #if defined(FEAT_ARABIC) || defined(PROTO)
  /*
   * Check if the character pointed to by "p2" is a composing character when it
   * comes after "p1".  For Arabic sometimes "ab" is replaced with "c", which
   * behaves like a composing character.
   */
      int
  utf_composinglike(char_u *p1, char_u *p2)
  {
      int		c2;
  
      c2 = utf_ptr2char(p2);
      if (utf_iscomposing(c2))
  	return TRUE;
      if (!arabic_maycombine(c2))
  	return FALSE;
      return arabic_combine(utf_ptr2char(p1), c2);
  }
  #endif
  
  /*
   * Convert a UTF-8 byte string to a wide character.  Also get up to MAX_MCO
   * composing characters.
   */
      int
  utfc_ptr2char(
      char_u	*p,
      int		*pcc)	// return: composing chars, last one is 0
  {
      int		len;
      int		c;
      int		cc;
      int		i = 0;
  
      c = utf_ptr2char(p);
      len = utf_ptr2len(p);
  
      // Only accept a composing char when the first char isn't illegal.
      if ((len > 1 || *p < 0x80)
  	    && p[len] >= 0x80
  	    && UTF_COMPOSINGLIKE(p, p + len))
      {
  	cc = utf_ptr2char(p + len);
  	for (;;)
  	{
  	    pcc[i++] = cc;
  	    if (i == MAX_MCO)
  		break;
  	    len += utf_ptr2len(p + len);
  	    if (p[len] < 0x80 || !utf_iscomposing(cc = utf_ptr2char(p + len)))
  		break;
  	}
      }
  
      if (i < MAX_MCO)	// last composing char must be 0
  	pcc[i] = 0;
  
      return c;
  }
  
  /*
   * Convert a UTF-8 byte string to a wide character.  Also get up to MAX_MCO
   * composing characters.  Use no more than p[maxlen].
   */
      int
  utfc_ptr2char_len(
      char_u	*p,
      int		*pcc,	// return: composing chars, last one is 0
      int		maxlen)
  {
      int		len;
      int		c;
      int		cc;
      int		i = 0;
  
      c = utf_ptr2char(p);
      len = utf_ptr2len_len(p, maxlen);
      // Only accept a composing char when the first char isn't illegal.
      if ((len > 1 || *p < 0x80)
  	    && len < maxlen
  	    && p[len] >= 0x80
  	    && UTF_COMPOSINGLIKE(p, p + len))
      {
  	cc = utf_ptr2char(p + len);
  	for (;;)
  	{
  	    pcc[i++] = cc;
  	    if (i == MAX_MCO)
  		break;
  	    len += utf_ptr2len_len(p + len, maxlen - len);
  	    if (len >= maxlen
  		    || p[len] < 0x80
  		    || !utf_iscomposing(cc = utf_ptr2char(p + len)))
  		break;
  	}
      }
  
      if (i < MAX_MCO)	// last composing char must be 0
  	pcc[i] = 0;
  
      return c;
  }
  
  /*
   * Convert the character at screen position "off" to a sequence of bytes.
   * Includes the composing characters.
   * "buf" must at least have the length MB_MAXBYTES + 1.
   * Only to be used when ScreenLinesUC[off] != 0.
   * Returns the produced number of bytes.
   */
      int
  utfc_char2bytes(int off, char_u *buf)
  {
      int		len;
      int		i;
  
      len = utf_char2bytes(ScreenLinesUC[off], buf);
      for (i = 0; i < Screen_mco; ++i)
      {
  	if (ScreenLinesC[i][off] == 0)
  	    break;
  	len += utf_char2bytes(ScreenLinesC[i][off], buf + len);
      }
      return len;
  }
  
  /*
   * Get the length of a UTF-8 byte sequence, not including any following
   * composing characters.
   * Returns 0 for "".
   * Returns 1 for an illegal byte sequence.
   */
      int
  utf_ptr2len(char_u *p)
  {
      int		len;
      int		i;
  
      if (*p == NUL)
  	return 0;
      len = utf8len_tab[*p];
      for (i = 1; i < len; ++i)
  	if ((p[i] & 0xc0) != 0x80)
  	    return 1;
      return len;
  }
  
  /*
   * Return length of UTF-8 character, obtained from the first byte.
   * "b" must be between 0 and 255!
   * Returns 1 for an invalid first byte value.
   */
      int
  utf_byte2len(int b)
  {
      return utf8len_tab[b];
  }
  
  /*
   * Get the length of UTF-8 byte sequence "p[size]".  Does not include any
   * following composing characters.
   * Returns 1 for "".
   * Returns 1 for an illegal byte sequence (also in incomplete byte seq.).
   * Returns number > "size" for an incomplete byte sequence.
   * Never returns zero.
   */
      int
  utf_ptr2len_len(char_u *p, int size)
  {
      int		len;
      int		i;
      int		m;
  
      len = utf8len_tab[*p];
      if (len == 1)
  	return 1;	// NUL, ascii or illegal lead byte
      if (len > size)
  	m = size;	// incomplete byte sequence.
      else
  	m = len;
      for (i = 1; i < m; ++i)
  	if ((p[i] & 0xc0) != 0x80)
  	    return 1;
      return len;
  }
  
  /*
   * Return the number of bytes the UTF-8 encoding of the character at "p" takes.
   * This includes following composing characters.
   */
      int
  utfc_ptr2len(char_u *p)
  {
      int		len;
      int		b0 = *p;
  #ifdef FEAT_ARABIC
      int		prevlen;
  #endif
  
      if (b0 == NUL)
  	return 0;
      if (b0 < 0x80 && p[1] < 0x80)	// be quick for ASCII
  	return 1;
  
      // Skip over first UTF-8 char, stopping at a NUL byte.
      len = utf_ptr2len(p);
  
      // Check for illegal byte.
      if (len == 1 && b0 >= 0x80)
  	return 1;
  
      /*
       * Check for composing characters.  We can handle only the first six, but
       * skip all of them (otherwise the cursor would get stuck).
       */
  #ifdef FEAT_ARABIC
      prevlen = 0;
  #endif
      for (;;)
      {
  	if (p[len] < 0x80 || !UTF_COMPOSINGLIKE(p + prevlen, p + len))
  	    return len;
  
  	// Skip over composing char
  #ifdef FEAT_ARABIC
  	prevlen = len;
  #endif
  	len += utf_ptr2len(p + len);
      }
  }
  
  /*
   * Return the number of bytes the UTF-8 encoding of the character at "p[size]"
   * takes.  This includes following composing characters.
   * Returns 0 for an empty string.
   * Returns 1 for an illegal char or an incomplete byte sequence.
   */
      int
  utfc_ptr2len_len(char_u *p, int size)
  {
      int		len;
  #ifdef FEAT_ARABIC
      int		prevlen;
  #endif
  
      if (size < 1 || *p == NUL)
  	return 0;
      if (p[0] < 0x80 && (size == 1 || p[1] < 0x80)) // be quick for ASCII
  	return 1;
  
      // Skip over first UTF-8 char, stopping at a NUL byte.
      len = utf_ptr2len_len(p, size);
  
      // Check for illegal byte and incomplete byte sequence.
      if ((len == 1 && p[0] >= 0x80) || len > size)
  	return 1;
  
      /*
       * Check for composing characters.  We can handle only the first six, but
       * skip all of them (otherwise the cursor would get stuck).
       */
  #ifdef FEAT_ARABIC
      prevlen = 0;
  #endif
      while (len < size)
      {
  	int	len_next_char;
  
  	if (p[len] < 0x80)
  	    break;
  
  	/*
  	 * Next character length should not go beyond size to ensure that
  	 * UTF_COMPOSINGLIKE(...) does not read beyond size.
  	 */
  	len_next_char = utf_ptr2len_len(p + len, size - len);
  	if (len_next_char > size - len)
  	    break;
  
  	if (!UTF_COMPOSINGLIKE(p + prevlen, p + len))
  	    break;
  
  	// Skip over composing char
  #ifdef FEAT_ARABIC
  	prevlen = len;
  #endif
  	len += len_next_char;
      }
      return len;
  }
  
  /*
   * Return the number of bytes the UTF-8 encoding of character "c" takes.
   * This does not include composing characters.
   */
      int
  utf_char2len(int c)
  {
      if (c < 0x80)
  	return 1;
      if (c < 0x800)
  	return 2;
      if (c < 0x10000)
  	return 3;
      if (c < 0x200000)
  	return 4;
      if (c < 0x4000000)
  	return 5;
      return 6;
  }
  
  /*
   * Convert Unicode character "c" to UTF-8 string in "buf[]".
   * Returns the number of bytes.
   */
      int
  utf_char2bytes(int c, char_u *buf)
  {
      if (c < 0x80)		// 7 bits
      {
  	buf[0] = c;
  	return 1;
      }
      if (c < 0x800)		// 11 bits
      {
  	buf[0] = 0xc0 + ((unsigned)c >> 6);
  	buf[1] = 0x80 + (c & 0x3f);
  	return 2;
      }
      if (c < 0x10000)		// 16 bits
      {
  	buf[0] = 0xe0 + ((unsigned)c >> 12);
  	buf[1] = 0x80 + (((unsigned)c >> 6) & 0x3f);
  	buf[2] = 0x80 + (c & 0x3f);
  	return 3;
      }
      if (c < 0x200000)		// 21 bits
      {
  	buf[0] = 0xf0 + ((unsigned)c >> 18);
  	buf[1] = 0x80 + (((unsigned)c >> 12) & 0x3f);
  	buf[2] = 0x80 + (((unsigned)c >> 6) & 0x3f);
  	buf[3] = 0x80 + (c & 0x3f);
  	return 4;
      }
      if (c < 0x4000000)		// 26 bits
      {
  	buf[0] = 0xf8 + ((unsigned)c >> 24);
  	buf[1] = 0x80 + (((unsigned)c >> 18) & 0x3f);
  	buf[2] = 0x80 + (((unsigned)c >> 12) & 0x3f);
  	buf[3] = 0x80 + (((unsigned)c >> 6) & 0x3f);
  	buf[4] = 0x80 + (c & 0x3f);
  	return 5;
      }
  				// 31 bits
      buf[0] = 0xfc + ((unsigned)c >> 30);
      buf[1] = 0x80 + (((unsigned)c >> 24) & 0x3f);
      buf[2] = 0x80 + (((unsigned)c >> 18) & 0x3f);
      buf[3] = 0x80 + (((unsigned)c >> 12) & 0x3f);
      buf[4] = 0x80 + (((unsigned)c >> 6) & 0x3f);
      buf[5] = 0x80 + (c & 0x3f);
      return 6;
  }
  
  #if defined(FEAT_TERMINAL) || defined(PROTO)
  /*
   * utf_iscomposing() with different argument type for libvterm.
   */
      int
  utf_iscomposing_uint(UINT32_T c)
  {
      return utf_iscomposing((int)c);
  }
  #endif
  
  /*
   * Return TRUE if "c" is a composing UTF-8 character.  This means it will be
   * drawn on top of the preceding character.
   * Based on code from Markus Kuhn.
   */
      int
  utf_iscomposing(int c)
  {
      // Sorted list of non-overlapping intervals.
      // Generated by ../runtime/tools/unicode.vim.
      static struct interval combining[] =
      {
  	{0x0300, 0x036f},
  	{0x0483, 0x0489},
  	{0x0591, 0x05bd},
  	{0x05bf, 0x05bf},
  	{0x05c1, 0x05c2},
  	{0x05c4, 0x05c5},
  	{0x05c7, 0x05c7},
  	{0x0610, 0x061a},
  	{0x064b, 0x065f},
  	{0x0670, 0x0670},
  	{0x06d6, 0x06dc},
  	{0x06df, 0x06e4},
  	{0x06e7, 0x06e8},
  	{0x06ea, 0x06ed},
  	{0x0711, 0x0711},
  	{0x0730, 0x074a},
  	{0x07a6, 0x07b0},
  	{0x07eb, 0x07f3},
  	{0x07fd, 0x07fd},
  	{0x0816, 0x0819},
  	{0x081b, 0x0823},
  	{0x0825, 0x0827},
  	{0x0829, 0x082d},
  	{0x0859, 0x085b},
  	{0x08d3, 0x08e1},
  	{0x08e3, 0x0903},
  	{0x093a, 0x093c},
  	{0x093e, 0x094f},
  	{0x0951, 0x0957},
  	{0x0962, 0x0963},
  	{0x0981, 0x0983},
  	{0x09bc, 0x09bc},
  	{0x09be, 0x09c4},
  	{0x09c7, 0x09c8},
  	{0x09cb, 0x09cd},
  	{0x09d7, 0x09d7},
  	{0x09e2, 0x09e3},
  	{0x09fe, 0x09fe},
  	{0x0a01, 0x0a03},
  	{0x0a3c, 0x0a3c},
  	{0x0a3e, 0x0a42},
  	{0x0a47, 0x0a48},
  	{0x0a4b, 0x0a4d},
  	{0x0a51, 0x0a51},
  	{0x0a70, 0x0a71},
  	{0x0a75, 0x0a75},
  	{0x0a81, 0x0a83},
  	{0x0abc, 0x0abc},
  	{0x0abe, 0x0ac5},
  	{0x0ac7, 0x0ac9},
  	{0x0acb, 0x0acd},
  	{0x0ae2, 0x0ae3},
  	{0x0afa, 0x0aff},
  	{0x0b01, 0x0b03},
  	{0x0b3c, 0x0b3c},
  	{0x0b3e, 0x0b44},
  	{0x0b47, 0x0b48},
  	{0x0b4b, 0x0b4d},
  	{0x0b55, 0x0b57},
  	{0x0b62, 0x0b63},
  	{0x0b82, 0x0b82},
  	{0x0bbe, 0x0bc2},
  	{0x0bc6, 0x0bc8},
  	{0x0bca, 0x0bcd},
  	{0x0bd7, 0x0bd7},
  	{0x0c00, 0x0c04},
  	{0x0c3e, 0x0c44},
  	{0x0c46, 0x0c48},
  	{0x0c4a, 0x0c4d},
  	{0x0c55, 0x0c56},
  	{0x0c62, 0x0c63},
  	{0x0c81, 0x0c83},
  	{0x0cbc, 0x0cbc},
  	{0x0cbe, 0x0cc4},
  	{0x0cc6, 0x0cc8},
  	{0x0cca, 0x0ccd},
  	{0x0cd5, 0x0cd6},
  	{0x0ce2, 0x0ce3},
  	{0x0d00, 0x0d03},
  	{0x0d3b, 0x0d3c},
  	{0x0d3e, 0x0d44},
  	{0x0d46, 0x0d48},
  	{0x0d4a, 0x0d4d},
  	{0x0d57, 0x0d57},
  	{0x0d62, 0x0d63},
  	{0x0d81, 0x0d83},
  	{0x0dca, 0x0dca},
  	{0x0dcf, 0x0dd4},
  	{0x0dd6, 0x0dd6},
  	{0x0dd8, 0x0ddf},
  	{0x0df2, 0x0df3},
  	{0x0e31, 0x0e31},
  	{0x0e34, 0x0e3a},
  	{0x0e47, 0x0e4e},
  	{0x0eb1, 0x0eb1},
  	{0x0eb4, 0x0ebc},
  	{0x0ec8, 0x0ecd},
  	{0x0f18, 0x0f19},
  	{0x0f35, 0x0f35},
  	{0x0f37, 0x0f37},
  	{0x0f39, 0x0f39},
  	{0x0f3e, 0x0f3f},
  	{0x0f71, 0x0f84},
  	{0x0f86, 0x0f87},
  	{0x0f8d, 0x0f97},
  	{0x0f99, 0x0fbc},
  	{0x0fc6, 0x0fc6},
  	{0x102b, 0x103e},
  	{0x1056, 0x1059},
  	{0x105e, 0x1060},
  	{0x1062, 0x1064},
  	{0x1067, 0x106d},
  	{0x1071, 0x1074},
  	{0x1082, 0x108d},
  	{0x108f, 0x108f},
  	{0x109a, 0x109d},
  	{0x135d, 0x135f},
  	{0x1712, 0x1714},
  	{0x1732, 0x1734},
  	{0x1752, 0x1753},
  	{0x1772, 0x1773},
  	{0x17b4, 0x17d3},
  	{0x17dd, 0x17dd},
  	{0x180b, 0x180d},
  	{0x1885, 0x1886},
  	{0x18a9, 0x18a9},
  	{0x1920, 0x192b},
  	{0x1930, 0x193b},
  	{0x1a17, 0x1a1b},
  	{0x1a55, 0x1a5e},
  	{0x1a60, 0x1a7c},
  	{0x1a7f, 0x1a7f},
  	{0x1ab0, 0x1ac0},
  	{0x1b00, 0x1b04},
  	{0x1b34, 0x1b44},
  	{0x1b6b, 0x1b73},
  	{0x1b80, 0x1b82},
  	{0x1ba1, 0x1bad},
  	{0x1be6, 0x1bf3},
  	{0x1c24, 0x1c37},
  	{0x1cd0, 0x1cd2},
  	{0x1cd4, 0x1ce8},
  	{0x1ced, 0x1ced},
  	{0x1cf4, 0x1cf4},
  	{0x1cf7, 0x1cf9},
  	{0x1dc0, 0x1df9},
  	{0x1dfb, 0x1dff},
  	{0x20d0, 0x20f0},
  	{0x2cef, 0x2cf1},
  	{0x2d7f, 0x2d7f},
  	{0x2de0, 0x2dff},
  	{0x302a, 0x302f},
  	{0x3099, 0x309a},
  	{0xa66f, 0xa672},
  	{0xa674, 0xa67d},
  	{0xa69e, 0xa69f},
  	{0xa6f0, 0xa6f1},
  	{0xa802, 0xa802},
  	{0xa806, 0xa806},
  	{0xa80b, 0xa80b},
  	{0xa823, 0xa827},
  	{0xa82c, 0xa82c},
  	{0xa880, 0xa881},
  	{0xa8b4, 0xa8c5},
  	{0xa8e0, 0xa8f1},
  	{0xa8ff, 0xa8ff},
  	{0xa926, 0xa92d},
  	{0xa947, 0xa953},
  	{0xa980, 0xa983},
  	{0xa9b3, 0xa9c0},
  	{0xa9e5, 0xa9e5},
  	{0xaa29, 0xaa36},
  	{0xaa43, 0xaa43},
  	{0xaa4c, 0xaa4d},
  	{0xaa7b, 0xaa7d},
  	{0xaab0, 0xaab0},
  	{0xaab2, 0xaab4},
  	{0xaab7, 0xaab8},
  	{0xaabe, 0xaabf},
  	{0xaac1, 0xaac1},
  	{0xaaeb, 0xaaef},
  	{0xaaf5, 0xaaf6},
  	{0xabe3, 0xabea},
  	{0xabec, 0xabed},
  	{0xfb1e, 0xfb1e},
  	{0xfe00, 0xfe0f},
  	{0xfe20, 0xfe2f},
  	{0x101fd, 0x101fd},
  	{0x102e0, 0x102e0},
  	{0x10376, 0x1037a},
  	{0x10a01, 0x10a03},
  	{0x10a05, 0x10a06},
  	{0x10a0c, 0x10a0f},
  	{0x10a38, 0x10a3a},
  	{0x10a3f, 0x10a3f},
  	{0x10ae5, 0x10ae6},
  	{0x10d24, 0x10d27},
  	{0x10eab, 0x10eac},
  	{0x10f46, 0x10f50},
  	{0x11000, 0x11002},
  	{0x11038, 0x11046},
  	{0x1107f, 0x11082},
  	{0x110b0, 0x110ba},
  	{0x11100, 0x11102},
  	{0x11127, 0x11134},
  	{0x11145, 0x11146},
  	{0x11173, 0x11173},
  	{0x11180, 0x11182},
  	{0x111b3, 0x111c0},
  	{0x111c9, 0x111cc},
  	{0x111ce, 0x111cf},
  	{0x1122c, 0x11237},
  	{0x1123e, 0x1123e},
  	{0x112df, 0x112ea},
  	{0x11300, 0x11303},
  	{0x1133b, 0x1133c},
  	{0x1133e, 0x11344},
  	{0x11347, 0x11348},
  	{0x1134b, 0x1134d},
  	{0x11357, 0x11357},
  	{0x11362, 0x11363},
  	{0x11366, 0x1136c},
  	{0x11370, 0x11374},
  	{0x11435, 0x11446},
  	{0x1145e, 0x1145e},
  	{0x114b0, 0x114c3},
  	{0x115af, 0x115b5},
  	{0x115b8, 0x115c0},
  	{0x115dc, 0x115dd},
  	{0x11630, 0x11640},
  	{0x116ab, 0x116b7},
  	{0x1171d, 0x1172b},
  	{0x1182c, 0x1183a},
  	{0x11930, 0x11935},
  	{0x11937, 0x11938},
  	{0x1193b, 0x1193e},
  	{0x11940, 0x11940},
  	{0x11942, 0x11943},
  	{0x119d1, 0x119d7},
  	{0x119da, 0x119e0},
  	{0x119e4, 0x119e4},
  	{0x11a01, 0x11a0a},
  	{0x11a33, 0x11a39},
  	{0x11a3b, 0x11a3e},
  	{0x11a47, 0x11a47},
  	{0x11a51, 0x11a5b},
  	{0x11a8a, 0x11a99},
  	{0x11c2f, 0x11c36},
  	{0x11c38, 0x11c3f},
  	{0x11c92, 0x11ca7},
  	{0x11ca9, 0x11cb6},
  	{0x11d31, 0x11d36},
  	{0x11d3a, 0x11d3a},
  	{0x11d3c, 0x11d3d},
  	{0x11d3f, 0x11d45},
  	{0x11d47, 0x11d47},
  	{0x11d8a, 0x11d8e},
  	{0x11d90, 0x11d91},
  	{0x11d93, 0x11d97},
  	{0x11ef3, 0x11ef6},
  	{0x16af0, 0x16af4},
  	{0x16b30, 0x16b36},
  	{0x16f4f, 0x16f4f},
  	{0x16f51, 0x16f87},
  	{0x16f8f, 0x16f92},
  	{0x16fe4, 0x16fe4},
  	{0x16ff0, 0x16ff1},
  	{0x1bc9d, 0x1bc9e},
  	{0x1d165, 0x1d169},
  	{0x1d16d, 0x1d172},
  	{0x1d17b, 0x1d182},
  	{0x1d185, 0x1d18b},
  	{0x1d1aa, 0x1d1ad},
  	{0x1d242, 0x1d244},
  	{0x1da00, 0x1da36},
  	{0x1da3b, 0x1da6c},
  	{0x1da75, 0x1da75},
  	{0x1da84, 0x1da84},
  	{0x1da9b, 0x1da9f},
  	{0x1daa1, 0x1daaf},
  	{0x1e000, 0x1e006},
  	{0x1e008, 0x1e018},
  	{0x1e01b, 0x1e021},
  	{0x1e023, 0x1e024},
  	{0x1e026, 0x1e02a},
  	{0x1e130, 0x1e136},
  	{0x1e2ec, 0x1e2ef},
  	{0x1e8d0, 0x1e8d6},
  	{0x1e944, 0x1e94a},
  	{0xe0100, 0xe01ef}
      };
  
      return intable(combining, sizeof(combining), c);
  }
  
  /*
   * Return TRUE for characters that can be displayed in a normal way.
   * Only for characters of 0x100 and above!
   */
      int
  utf_printable(int c)
  {
  #ifdef USE_WCHAR_FUNCTIONS
      /*
       * Assume the iswprint() library function works better than our own stuff.
       */
      return iswprint(c);
  #else
      // Sorted list of non-overlapping intervals.
      // 0xd800-0xdfff is reserved for UTF-16, actually illegal.
      static struct interval nonprint[] =
      {
  	{0x070f, 0x070f}, {0x180b, 0x180e}, {0x200b, 0x200f}, {0x202a, 0x202e},
  	{0x2060, 0x206f}, {0xd800, 0xdfff}, {0xfeff, 0xfeff}, {0xfff9, 0xfffb},
  	{0xfffe, 0xffff}
      };
  
      return !intable(nonprint, sizeof(nonprint), c);
  #endif
  }
  
  // Sorted list of non-overlapping intervals of all Emoji characters,
  // based on http://unicode.org/emoji/charts/emoji-list.html
  // Generated by ../runtime/tools/unicode.vim.
  // Excludes 0x00a9 and 0x00ae because they are considered latin1.
  static struct interval emoji_all[] =
  {
      {0x203c, 0x203c},
      {0x2049, 0x2049},
      {0x2122, 0x2122},
      {0x2139, 0x2139},
      {0x2194, 0x2199},
      {0x21a9, 0x21aa},
      {0x231a, 0x231b},
      {0x2328, 0x2328},
      {0x23cf, 0x23cf},
      {0x23e9, 0x23f3},
      {0x23f8, 0x23fa},
      {0x24c2, 0x24c2},
      {0x25aa, 0x25ab},
      {0x25b6, 0x25b6},
      {0x25c0, 0x25c0},
      {0x25fb, 0x25fe},
      {0x2600, 0x2604},
      {0x260e, 0x260e},
      {0x2611, 0x2611},
      {0x2614, 0x2615},
      {0x2618, 0x2618},
      {0x261d, 0x261d},
      {0x2620, 0x2620},
      {0x2622, 0x2623},
      {0x2626, 0x2626},
      {0x262a, 0x262a},
      {0x262e, 0x262f},
      {0x2638, 0x263a},
      {0x2640, 0x2640},
      {0x2642, 0x2642},
      {0x2648, 0x2653},
      {0x265f, 0x2660},
      {0x2663, 0x2663},
      {0x2665, 0x2666},
      {0x2668, 0x2668},
      {0x267b, 0x267b},
      {0x267e, 0x267f},
      {0x2692, 0x2697},
      {0x2699, 0x2699},
      {0x269b, 0x269c},
      {0x26a0, 0x26a1},
      {0x26a7, 0x26a7},
      {0x26aa, 0x26ab},
      {0x26b0, 0x26b1},
      {0x26bd, 0x26be},
      {0x26c4, 0x26c5},
      {0x26c8, 0x26c8},
      {0x26ce, 0x26cf},
      {0x26d1, 0x26d1},
      {0x26d3, 0x26d4},
      {0x26e9, 0x26ea},
      {0x26f0, 0x26f5},
      {0x26f7, 0x26fa},
      {0x26fd, 0x26fd},
      {0x2702, 0x2702},
      {0x2705, 0x2705},
      {0x2708, 0x270d},
      {0x270f, 0x270f},
      {0x2712, 0x2712},
      {0x2714, 0x2714},
      {0x2716, 0x2716},
      {0x271d, 0x271d},
      {0x2721, 0x2721},
      {0x2728, 0x2728},
      {0x2733, 0x2734},
      {0x2744, 0x2744},
      {0x2747, 0x2747},
      {0x274c, 0x274c},
      {0x274e, 0x274e},
      {0x2753, 0x2755},
      {0x2757, 0x2757},
      {0x2763, 0x2764},
      {0x2795, 0x2797},
      {0x27a1, 0x27a1},
      {0x27b0, 0x27b0},
      {0x27bf, 0x27bf},
      {0x2934, 0x2935},
      {0x2b05, 0x2b07},
      {0x2b1b, 0x2b1c},
      {0x2b50, 0x2b50},
      {0x2b55, 0x2b55},
      {0x3030, 0x3030},
      {0x303d, 0x303d},
      {0x3297, 0x3297},
      {0x3299, 0x3299},
      {0x1f004, 0x1f004},
      {0x1f0cf, 0x1f0cf},
      {0x1f170, 0x1f171},
      {0x1f17e, 0x1f17f},
      {0x1f18e, 0x1f18e},
      {0x1f191, 0x1f19a},
      {0x1f1e6, 0x1f1ff},
      {0x1f201, 0x1f202},
      {0x1f21a, 0x1f21a},
      {0x1f22f, 0x1f22f},
      {0x1f232, 0x1f23a},
      {0x1f250, 0x1f251},
      {0x1f300, 0x1f321},
      {0x1f324, 0x1f393},
      {0x1f396, 0x1f397},
      {0x1f399, 0x1f39b},
      {0x1f39e, 0x1f3f0},
      {0x1f3f3, 0x1f3f5},
      {0x1f3f7, 0x1f4fd},
      {0x1f4ff, 0x1f53d},
      {0x1f549, 0x1f54e},
      {0x1f550, 0x1f567},
      {0x1f56f, 0x1f570},
      {0x1f573, 0x1f57a},
      {0x1f587, 0x1f587},
      {0x1f58a, 0x1f58d},
      {0x1f590, 0x1f590},
      {0x1f595, 0x1f596},
      {0x1f5a4, 0x1f5a5},
      {0x1f5a8, 0x1f5a8},
      {0x1f5b1, 0x1f5b2},
      {0x1f5bc, 0x1f5bc},
      {0x1f5c2, 0x1f5c4},
      {0x1f5d1, 0x1f5d3},
      {0x1f5dc, 0x1f5de},
      {0x1f5e1, 0x1f5e1},
      {0x1f5e3, 0x1f5e3},
      {0x1f5e8, 0x1f5e8},
      {0x1f5ef, 0x1f5ef},
      {0x1f5f3, 0x1f5f3},
      {0x1f5fa, 0x1f64f},
      {0x1f680, 0x1f6c5},
      {0x1f6cb, 0x1f6d2},
      {0x1f6d5, 0x1f6d7},
      {0x1f6e0, 0x1f6e5},
      {0x1f6e9, 0x1f6e9},
      {0x1f6eb, 0x1f6ec},
      {0x1f6f0, 0x1f6f0},
      {0x1f6f3, 0x1f6fc},
      {0x1f7e0, 0x1f7eb},
      {0x1f90c, 0x1f93a},
      {0x1f93c, 0x1f945},
      {0x1f947, 0x1f978},
      {0x1f97a, 0x1f9cb},
      {0x1f9cd, 0x1f9ff},
      {0x1fa70, 0x1fa74},
      {0x1fa78, 0x1fa7a},
      {0x1fa80, 0x1fa86},
      {0x1fa90, 0x1faa8},
      {0x1fab0, 0x1fab6},
      {0x1fac0, 0x1fac2},
      {0x1fad0, 0x1fad6}
  };
  
  /*
   * Get class of a Unicode character.
   * 0: white space
   * 1: punctuation
   * 2 or bigger: some class of word character.
   */
      int
  utf_class(int c)
  {
      return utf_class_buf(c, curbuf);
  }
  
      int
  utf_class_buf(int c, buf_T *buf)
  {
      // sorted list of non-overlapping intervals
      static struct clinterval
      {
  	unsigned int first;
  	unsigned int last;
  	unsigned int class;
      } classes[] =
      {
  	{0x037e, 0x037e, 1},		// Greek question mark
  	{0x0387, 0x0387, 1},		// Greek ano teleia
  	{0x055a, 0x055f, 1},		// Armenian punctuation
  	{0x0589, 0x0589, 1},		// Armenian full stop
  	{0x05be, 0x05be, 1},
  	{0x05c0, 0x05c0, 1},
  	{0x05c3, 0x05c3, 1},
  	{0x05f3, 0x05f4, 1},
  	{0x060c, 0x060c, 1},
  	{0x061b, 0x061b, 1},
  	{0x061f, 0x061f, 1},
  	{0x066a, 0x066d, 1},
  	{0x06d4, 0x06d4, 1},
  	{0x0700, 0x070d, 1},		// Syriac punctuation
  	{0x0964, 0x0965, 1},
  	{0x0970, 0x0970, 1},
  	{0x0df4, 0x0df4, 1},
  	{0x0e4f, 0x0e4f, 1},
  	{0x0e5a, 0x0e5b, 1},
  	{0x0f04, 0x0f12, 1},
  	{0x0f3a, 0x0f3d, 1},
  	{0x0f85, 0x0f85, 1},
  	{0x104a, 0x104f, 1},		// Myanmar punctuation
  	{0x10fb, 0x10fb, 1},		// Georgian punctuation
  	{0x1361, 0x1368, 1},		// Ethiopic punctuation
  	{0x166d, 0x166e, 1},		// Canadian Syl. punctuation
  	{0x1680, 0x1680, 0},
  	{0x169b, 0x169c, 1},
  	{0x16eb, 0x16ed, 1},
  	{0x1735, 0x1736, 1},
  	{0x17d4, 0x17dc, 1},		// Khmer punctuation
  	{0x1800, 0x180a, 1},		// Mongolian punctuation
  	{0x2000, 0x200b, 0},		// spaces
  	{0x200c, 0x2027, 1},		// punctuation and symbols
  	{0x2028, 0x2029, 0},
  	{0x202a, 0x202e, 1},		// punctuation and symbols
  	{0x202f, 0x202f, 0},
  	{0x2030, 0x205e, 1},		// punctuation and symbols
  	{0x205f, 0x205f, 0},
  	{0x2060, 0x27ff, 1},		// punctuation and symbols
  	{0x2070, 0x207f, 0x2070},	// superscript
  	{0x2080, 0x2094, 0x2080},	// subscript
  	{0x20a0, 0x27ff, 1},		// all kinds of symbols
  	{0x2800, 0x28ff, 0x2800},	// braille
  	{0x2900, 0x2998, 1},		// arrows, brackets, etc.
  	{0x29d8, 0x29db, 1},
  	{0x29fc, 0x29fd, 1},
  	{0x2e00, 0x2e7f, 1},		// supplemental punctuation
  	{0x3000, 0x3000, 0},		// ideographic space
  	{0x3001, 0x3020, 1},		// ideographic punctuation
  	{0x3030, 0x3030, 1},
  	{0x303d, 0x303d, 1},
  	{0x3040, 0x309f, 0x3040},	// Hiragana
  	{0x30a0, 0x30ff, 0x30a0},	// Katakana
  	{0x3300, 0x9fff, 0x4e00},	// CJK Ideographs
  	{0xac00, 0xd7a3, 0xac00},	// Hangul Syllables
  	{0xf900, 0xfaff, 0x4e00},	// CJK Ideographs
  	{0xfd3e, 0xfd3f, 1},
  	{0xfe30, 0xfe6b, 1},		// punctuation forms
  	{0xff00, 0xff0f, 1},		// half/fullwidth ASCII
  	{0xff1a, 0xff20, 1},		// half/fullwidth ASCII
  	{0xff3b, 0xff40, 1},		// half/fullwidth ASCII
  	{0xff5b, 0xff65, 1},		// half/fullwidth ASCII
  	{0x1d000, 0x1d24f, 1},		// Musical notation
  	{0x1d400, 0x1d7ff, 1},		// Mathematical Alphanumeric Symbols
  	{0x1f000, 0x1f2ff, 1},		// Game pieces; enclosed characters
  	{0x1f300, 0x1f9ff, 1},		// Many symbol blocks
  	{0x20000, 0x2a6df, 0x4e00},	// CJK Ideographs
  	{0x2a700, 0x2b73f, 0x4e00},	// CJK Ideographs
  	{0x2b740, 0x2b81f, 0x4e00},	// CJK Ideographs
  	{0x2f800, 0x2fa1f, 0x4e00},	// CJK Ideographs
      };
  
      int bot = 0;
      int top = ARRAY_LENGTH(classes) - 1;
      int mid;
  
      // First quick check for Latin1 characters, use 'iskeyword'.
      if (c < 0x100)
      {
  	if (c == ' ' || c == '\t' || c == NUL || c == 0xa0)
  	    return 0;	    // blank
  	if (vim_iswordc_buf(c, buf))
  	    return 2;	    // word character
  	return 1;	    // punctuation
      }
  
      // emoji
      if (intable(emoji_all, sizeof(emoji_all), c))
  	return 3;
  
      // binary search in table
      while (top >= bot)
      {
  	mid = (bot + top) / 2;
  	if (classes[mid].last < (unsigned int)c)
  	    bot = mid + 1;
  	else if (classes[mid].first > (unsigned int)c)
  	    top = mid - 1;
  	else
  	    return (int)classes[mid].class;
      }
  
      // most other characters are "word" characters
      return 2;
  }
  
      int
  utf_ambiguous_width(int c)
  {
      return c >= 0x80 && (intable(ambiguous, sizeof(ambiguous), c)
  	    || intable(emoji_all, sizeof(emoji_all), c));
  }
  
  /*
   * Code for Unicode case-dependent operations.  Based on notes in
   * http://www.unicode.org/Public/UNIDATA/CaseFolding.txt
   * This code uses simple case folding, not full case folding.
   * Last updated for Unicode 5.2.
   */
  
  /*
   * The following tables are built by ../runtime/tools/unicode.vim.
   * They must be in numeric order, because we use binary search.
   * An entry such as {0x41,0x5a,1,32} means that Unicode characters in the
   * range from 0x41 to 0x5a inclusive, stepping by 1, are changed to
   * folded/upper/lower by adding 32.
   */
  typedef struct
  {
      int rangeStart;
      int rangeEnd;
      int step;
      int offset;
  } convertStruct;
  
  static convertStruct foldCase[] =
  {
  	{0x41,0x5a,1,32},
  	{0xb5,0xb5,-1,775},
  	{0xc0,0xd6,1,32},
  	{0xd8,0xde,1,32},
  	{0x100,0x12e,2,1},
  	{0x132,0x136,2,1},
  	{0x139,0x147,2,1},
  	{0x14a,0x176,2,1},
  	{0x178,0x178,-1,-121},
  	{0x179,0x17d,2,1},
  	{0x17f,0x17f,-1,-268},
  	{0x181,0x181,-1,210},
  	{0x182,0x184,2,1},
  	{0x186,0x186,-1,206},
  	{0x187,0x187,-1,1},
  	{0x189,0x18a,1,205},
  	{0x18b,0x18b,-1,1},
  	{0x18e,0x18e,-1,79},
  	{0x18f,0x18f,-1,202},
  	{0x190,0x190,-1,203},
  	{0x191,0x191,-1,1},
  	{0x193,0x193,-1,205},
  	{0x194,0x194,-1,207},
  	{0x196,0x196,-1,211},
  	{0x197,0x197,-1,209},
  	{0x198,0x198,-1,1},
  	{0x19c,0x19c,-1,211},
  	{0x19d,0x19d,-1,213},
  	{0x19f,0x19f,-1,214},
  	{0x1a0,0x1a4,2,1},
  	{0x1a6,0x1a6,-1,218},
  	{0x1a7,0x1a7,-1,1},
  	{0x1a9,0x1a9,-1,218},
  	{0x1ac,0x1ac,-1,1},
  	{0x1ae,0x1ae,-1,218},
  	{0x1af,0x1af,-1,1},
  	{0x1b1,0x1b2,1,217},
  	{0x1b3,0x1b5,2,1},
  	{0x1b7,0x1b7,-1,219},
  	{0x1b8,0x1bc,4,1},
  	{0x1c4,0x1c4,-1,2},
  	{0x1c5,0x1c5,-1,1},
  	{0x1c7,0x1c7,-1,2},
  	{0x1c8,0x1c8,-1,1},
  	{0x1ca,0x1ca,-1,2},
  	{0x1cb,0x1db,2,1},
  	{0x1de,0x1ee,2,1},
  	{0x1f1,0x1f1,-1,2},
  	{0x1f2,0x1f4,2,1},
  	{0x1f6,0x1f6,-1,-97},
  	{0x1f7,0x1f7,-1,-56},
  	{0x1f8,0x21e,2,1},
  	{0x220,0x220,-1,-130},
  	{0x222,0x232,2,1},
  	{0x23a,0x23a,-1,10795},
  	{0x23b,0x23b,-1,1},
  	{0x23d,0x23d,-1,-163},
  	{0x23e,0x23e,-1,10792},
  	{0x241,0x241,-1,1},
  	{0x243,0x243,-1,-195},
  	{0x244,0x244,-1,69},
  	{0x245,0x245,-1,71},
  	{0x246,0x24e,2,1},
  	{0x345,0x345,-1,116},
  	{0x370,0x372,2,1},
  	{0x376,0x376,-1,1},
  	{0x37f,0x37f,-1,116},
  	{0x386,0x386,-1,38},
  	{0x388,0x38a,1,37},
  	{0x38c,0x38c,-1,64},
  	{0x38e,0x38f,1,63},
  	{0x391,0x3a1,1,32},
  	{0x3a3,0x3ab,1,32},
  	{0x3c2,0x3c2,-1,1},
  	{0x3cf,0x3cf,-1,8},
  	{0x3d0,0x3d0,-1,-30},
  	{0x3d1,0x3d1,-1,-25},
  	{0x3d5,0x3d5,-1,-15},
  	{0x3d6,0x3d6,-1,-22},
  	{0x3d8,0x3ee,2,1},
  	{0x3f0,0x3f0,-1,-54},
  	{0x3f1,0x3f1,-1,-48},
  	{0x3f4,0x3f4,-1,-60},
  	{0x3f5,0x3f5,-1,-64},
  	{0x3f7,0x3f7,-1,1},
  	{0x3f9,0x3f9,-1,-7},
  	{0x3fa,0x3fa,-1,1},
  	{0x3fd,0x3ff,1,-130},
  	{0x400,0x40f,1,80},
  	{0x410,0x42f,1,32},
  	{0x460,0x480,2,1},
  	{0x48a,0x4be,2,1},
  	{0x4c0,0x4c0,-1,15},
  	{0x4c1,0x4cd,2,1},
  	{0x4d0,0x52e,2,1},
  	{0x531,0x556,1,48},
  	{0x10a0,0x10c5,1,7264},
  	{0x10c7,0x10cd,6,7264},
  	{0x13f8,0x13fd,1,-8},
  	{0x1c80,0x1c80,-1,-6222},
  	{0x1c81,0x1c81,-1,-6221},
  	{0x1c82,0x1c82,-1,-6212},
  	{0x1c83,0x1c84,1,-6210},
  	{0x1c85,0x1c85,-1,-6211},
  	{0x1c86,0x1c86,-1,-6204},
  	{0x1c87,0x1c87,-1,-6180},
  	{0x1c88,0x1c88,-1,35267},
  	{0x1c90,0x1cba,1,-3008},
  	{0x1cbd,0x1cbf,1,-3008},
  	{0x1e00,0x1e94,2,1},
  	{0x1e9b,0x1e9b,-1,-58},
  	{0x1e9e,0x1e9e,-1,-7615},
  	{0x1ea0,0x1efe,2,1},
  	{0x1f08,0x1f0f,1,-8},
  	{0x1f18,0x1f1d,1,-8},
  	{0x1f28,0x1f2f,1,-8},
  	{0x1f38,0x1f3f,1,-8},
  	{0x1f48,0x1f4d,1,-8},
  	{0x1f59,0x1f5f,2,-8},
  	{0x1f68,0x1f6f,1,-8},
  	{0x1f88,0x1f8f,1,-8},
  	{0x1f98,0x1f9f,1,-8},
  	{0x1fa8,0x1faf,1,-8},
  	{0x1fb8,0x1fb9,1,-8},
  	{0x1fba,0x1fbb,1,-74},
  	{0x1fbc,0x1fbc,-1,-9},
  	{0x1fbe,0x1fbe,-1,-7173},
  	{0x1fc8,0x1fcb,1,-86},
  	{0x1fcc,0x1fcc,-1,-9},
  	{0x1fd8,0x1fd9,1,-8},
  	{0x1fda,0x1fdb,1,-100},
  	{0x1fe8,0x1fe9,1,-8},
  	{0x1fea,0x1feb,1,-112},
  	{0x1fec,0x1fec,-1,-7},
  	{0x1ff8,0x1ff9,1,-128},
  	{0x1ffa,0x1ffb,1,-126},
  	{0x1ffc,0x1ffc,-1,-9},
  	{0x2126,0x2126,-1,-7517},
  	{0x212a,0x212a,-1,-8383},
  	{0x212b,0x212b,-1,-8262},
  	{0x2132,0x2132,-1,28},
  	{0x2160,0x216f,1,16},
  	{0x2183,0x2183,-1,1},
  	{0x24b6,0x24cf,1,26},
  	{0x2c00,0x2c2e,1,48},
  	{0x2c60,0x2c60,-1,1},
  	{0x2c62,0x2c62,-1,-10743},
  	{0x2c63,0x2c63,-1,-3814},
  	{0x2c64,0x2c64,-1,-10727},
  	{0x2c67,0x2c6b,2,1},
  	{0x2c6d,0x2c6d,-1,-10780},
  	{0x2c6e,0x2c6e,-1,-10749},
  	{0x2c6f,0x2c6f,-1,-10783},
  	{0x2c70,0x2c70,-1,-10782},
  	{0x2c72,0x2c75,3,1},
  	{0x2c7e,0x2c7f,1,-10815},
  	{0x2c80,0x2ce2,2,1},
  	{0x2ceb,0x2ced,2,1},
  	{0x2cf2,0xa640,31054,1},
  	{0xa642,0xa66c,2,1},
  	{0xa680,0xa69a,2,1},
  	{0xa722,0xa72e,2,1},
  	{0xa732,0xa76e,2,1},
  	{0xa779,0xa77b,2,1},
  	{0xa77d,0xa77d,-1,-35332},
  	{0xa77e,0xa786,2,1},
  	{0xa78b,0xa78b,-1,1},
  	{0xa78d,0xa78d,-1,-42280},
  	{0xa790,0xa792,2,1},
  	{0xa796,0xa7a8,2,1},
  	{0xa7aa,0xa7aa,-1,-42308},
  	{0xa7ab,0xa7ab,-1,-42319},
  	{0xa7ac,0xa7ac,-1,-42315},
  	{0xa7ad,0xa7ad,-1,-42305},
  	{0xa7ae,0xa7ae,-1,-42308},
  	{0xa7b0,0xa7b0,-1,-42258},
  	{0xa7b1,0xa7b1,-1,-42282},
  	{0xa7b2,0xa7b2,-1,-42261},
  	{0xa7b3,0xa7b3,-1,928},
  	{0xa7b4,0xa7be,2,1},
  	{0xa7c2,0xa7c2,-1,1},
  	{0xa7c4,0xa7c4,-1,-48},
  	{0xa7c5,0xa7c5,-1,-42307},
  	{0xa7c6,0xa7c6,-1,-35384},
  	{0xa7c7,0xa7c9,2,1},
  	{0xa7f5,0xa7f5,-1,1},
  	{0xab70,0xabbf,1,-38864},
  	{0xff21,0xff3a,1,32},
  	{0x10400,0x10427,1,40},
  	{0x104b0,0x104d3,1,40},
  	{0x10c80,0x10cb2,1,64},
  	{0x118a0,0x118bf,1,32},
  	{0x16e40,0x16e5f,1,32},
  	{0x1e900,0x1e921,1,34}
  };
  
  /*
   * Generic conversion function for case operations.
   * Return the converted equivalent of "a", which is a UCS-4 character.  Use
   * the given conversion "table".  Uses binary search on "table".
   */
      static int
  utf_convert(
      int			a,
      convertStruct	table[],
      int			tableSize)
  {
      int start, mid, end; // indices into table
      int entries = tableSize / sizeof(convertStruct);
  
      start = 0;
      end = entries;
      while (start < end)
      {
  	// need to search further
  	mid = (end + start) / 2;
  	if (table[mid].rangeEnd < a)
  	    start = mid + 1;
  	else
  	    end = mid;
      }
      if (start < entries
  	    && table[start].rangeStart <= a
  	    && a <= table[start].rangeEnd
  	    && (a - table[start].rangeStart) % table[start].step == 0)
  	return (a + table[start].offset);
      else
  	return a;
  }
  
  /*
   * Return the folded-case equivalent of "a", which is a UCS-4 character.  Uses
   * simple case folding.
   */
      int
  utf_fold(int a)
  {
      if (a < 0x80)
  	// be fast for ASCII
  	return a >= 0x41 && a <= 0x5a ? a + 32 : a;
      return utf_convert(a, foldCase, (int)sizeof(foldCase));
  }
  
  static convertStruct toLower[] =
  {
  	{0x41,0x5a,1,32},
  	{0xc0,0xd6,1,32},
  	{0xd8,0xde,1,32},
  	{0x100,0x12e,2,1},
  	{0x130,0x130,-1,-199},
  	{0x132,0x136,2,1},
  	{0x139,0x147,2,1},
  	{0x14a,0x176,2,1},
  	{0x178,0x178,-1,-121},
  	{0x179,0x17d,2,1},
  	{0x181,0x181,-1,210},
  	{0x182,0x184,2,1},
  	{0x186,0x186,-1,206},
  	{0x187,0x187,-1,1},
  	{0x189,0x18a,1,205},
  	{0x18b,0x18b,-1,1},
  	{0x18e,0x18e,-1,79},
  	{0x18f,0x18f,-1,202},
  	{0x190,0x190,-1,203},
  	{0x191,0x191,-1,1},
  	{0x193,0x193,-1,205},
  	{0x194,0x194,-1,207},
  	{0x196,0x196,-1,211},
  	{0x197,0x197,-1,209},
  	{0x198,0x198,-1,1},
  	{0x19c,0x19c,-1,211},
  	{0x19d,0x19d,-1,213},
  	{0x19f,0x19f,-1,214},
  	{0x1a0,0x1a4,2,1},
  	{0x1a6,0x1a6,-1,218},
  	{0x1a7,0x1a7,-1,1},
  	{0x1a9,0x1a9,-1,218},
  	{0x1ac,0x1ac,-1,1},
  	{0x1ae,0x1ae,-1,218},
  	{0x1af,0x1af,-1,1},
  	{0x1b1,0x1b2,1,217},
  	{0x1b3,0x1b5,2,1},
  	{0x1b7,0x1b7,-1,219},
  	{0x1b8,0x1bc,4,1},
  	{0x1c4,0x1c4,-1,2},
  	{0x1c5,0x1c5,-1,1},
  	{0x1c7,0x1c7,-1,2},
  	{0x1c8,0x1c8,-1,1},
  	{0x1ca,0x1ca,-1,2},
  	{0x1cb,0x1db,2,1},
  	{0x1de,0x1ee,2,1},
  	{0x1f1,0x1f1,-1,2},
  	{0x1f2,0x1f4,2,1},
  	{0x1f6,0x1f6,-1,-97},
  	{0x1f7,0x1f7,-1,-56},
  	{0x1f8,0x21e,2,1},
  	{0x220,0x220,-1,-130},
  	{0x222,0x232,2,1},
  	{0x23a,0x23a,-1,10795},
  	{0x23b,0x23b,-1,1},
  	{0x23d,0x23d,-1,-163},
  	{0x23e,0x23e,-1,10792},
  	{0x241,0x241,-1,1},
  	{0x243,0x243,-1,-195},
  	{0x244,0x244,-1,69},
  	{0x245,0x245,-1,71},
  	{0x246,0x24e,2,1},
  	{0x370,0x372,2,1},
  	{0x376,0x376,-1,1},
  	{0x37f,0x37f,-1,116},
  	{0x386,0x386,-1,38},
  	{0x388,0x38a,1,37},
  	{0x38c,0x38c,-1,64},
  	{0x38e,0x38f,1,63},
  	{0x391,0x3a1,1,32},
  	{0x3a3,0x3ab,1,32},
  	{0x3cf,0x3cf,-1,8},
  	{0x3d8,0x3ee,2,1},
  	{0x3f4,0x3f4,-1,-60},
  	{0x3f7,0x3f7,-1,1},
  	{0x3f9,0x3f9,-1,-7},
  	{0x3fa,0x3fa,-1,1},
  	{0x3fd,0x3ff,1,-130},
  	{0x400,0x40f,1,80},
  	{0x410,0x42f,1,32},
  	{0x460,0x480,2,1},
  	{0x48a,0x4be,2,1},
  	{0x4c0,0x4c0,-1,15},
  	{0x4c1,0x4cd,2,1},
  	{0x4d0,0x52e,2,1},
  	{0x531,0x556,1,48},
  	{0x10a0,0x10c5,1,7264},
  	{0x10c7,0x10cd,6,7264},
  	{0x13a0,0x13ef,1,38864},
  	{0x13f0,0x13f5,1,8},
  	{0x1c90,0x1cba,1,-3008},
  	{0x1cbd,0x1cbf,1,-3008},
  	{0x1e00,0x1e94,2,1},
  	{0x1e9e,0x1e9e,-1,-7615},
  	{0x1ea0,0x1efe,2,1},
  	{0x1f08,0x1f0f,1,-8},
  	{0x1f18,0x1f1d,1,-8},
  	{0x1f28,0x1f2f,1,-8},
  	{0x1f38,0x1f3f,1,-8},
  	{0x1f48,0x1f4d,1,-8},
  	{0x1f59,0x1f5f,2,-8},
  	{0x1f68,0x1f6f,1,-8},
  	{0x1f88,0x1f8f,1,-8},
  	{0x1f98,0x1f9f,1,-8},
  	{0x1fa8,0x1faf,1,-8},
  	{0x1fb8,0x1fb9,1,-8},
  	{0x1fba,0x1fbb,1,-74},
  	{0x1fbc,0x1fbc,-1,-9},
  	{0x1fc8,0x1fcb,1,-86},
  	{0x1fcc,0x1fcc,-1,-9},
  	{0x1fd8,0x1fd9,1,-8},
  	{0x1fda,0x1fdb,1,-100},
  	{0x1fe8,0x1fe9,1,-8},
  	{0x1fea,0x1feb,1,-112},
  	{0x1fec,0x1fec,-1,-7},
  	{0x1ff8,0x1ff9,1,-128},
  	{0x1ffa,0x1ffb,1,-126},
  	{0x1ffc,0x1ffc,-1,-9},
  	{0x2126,0x2126,-1,-7517},
  	{0x212a,0x212a,-1,-8383},
  	{0x212b,0x212b,-1,-8262},
  	{0x2132,0x2132,-1,28},
  	{0x2160,0x216f,1,16},
  	{0x2183,0x2183,-1,1},
  	{0x24b6,0x24cf,1,26},
  	{0x2c00,0x2c2e,1,48},
  	{0x2c60,0x2c60,-1,1},
  	{0x2c62,0x2c62,-1,-10743},
  	{0x2c63,0x2c63,-1,-3814},
  	{0x2c64,0x2c64,-1,-10727},
  	{0x2c67,0x2c6b,2,1},
  	{0x2c6d,0x2c6d,-1,-10780},
  	{0x2c6e,0x2c6e,-1,-10749},
  	{0x2c6f,0x2c6f,-1,-10783},
  	{0x2c70,0x2c70,-1,-10782},
  	{0x2c72,0x2c75,3,1},
  	{0x2c7e,0x2c7f,1,-10815},
  	{0x2c80,0x2ce2,2,1},
  	{0x2ceb,0x2ced,2,1},
  	{0x2cf2,0xa640,31054,1},
  	{0xa642,0xa66c,2,1},
  	{0xa680,0xa69a,2,1},
  	{0xa722,0xa72e,2,1},
  	{0xa732,0xa76e,2,1},
  	{0xa779,0xa77b,2,1},
  	{0xa77d,0xa77d,-1,-35332},
  	{0xa77e,0xa786,2,1},
  	{0xa78b,0xa78b,-1,1},
  	{0xa78d,0xa78d,-1,-42280},
  	{0xa790,0xa792,2,1},
  	{0xa796,0xa7a8,2,1},
  	{0xa7aa,0xa7aa,-1,-42308},
  	{0xa7ab,0xa7ab,-1,-42319},
  	{0xa7ac,0xa7ac,-1,-42315},
  	{0xa7ad,0xa7ad,-1,-42305},
  	{0xa7ae,0xa7ae,-1,-42308},
  	{0xa7b0,0xa7b0,-1,-42258},
  	{0xa7b1,0xa7b1,-1,-42282},
  	{0xa7b2,0xa7b2,-1,-42261},
  	{0xa7b3,0xa7b3,-1,928},
  	{0xa7b4,0xa7be,2,1},
  	{0xa7c2,0xa7c2,-1,1},
  	{0xa7c4,0xa7c4,-1,-48},
  	{0xa7c5,0xa7c5,-1,-42307},
  	{0xa7c6,0xa7c6,-1,-35384},
  	{0xa7c7,0xa7c9,2,1},
  	{0xa7f5,0xa7f5,-1,1},
  	{0xff21,0xff3a,1,32},
  	{0x10400,0x10427,1,40},
  	{0x104b0,0x104d3,1,40},
  	{0x10c80,0x10cb2,1,64},
  	{0x118a0,0x118bf,1,32},
  	{0x16e40,0x16e5f,1,32},
  	{0x1e900,0x1e921,1,34}
  };
  
  static convertStruct toUpper[] =
  {
  	{0x61,0x7a,1,-32},
  	{0xb5,0xb5,-1,743},
  	{0xe0,0xf6,1,-32},
  	{0xf8,0xfe,1,-32},
  	{0xff,0xff,-1,121},
  	{0x101,0x12f,2,-1},
  	{0x131,0x131,-1,-232},
  	{0x133,0x137,2,-1},
  	{0x13a,0x148,2,-1},
  	{0x14b,0x177,2,-1},
  	{0x17a,0x17e,2,-1},
  	{0x17f,0x17f,-1,-300},
  	{0x180,0x180,-1,195},
  	{0x183,0x185,2,-1},
  	{0x188,0x18c,4,-1},
  	{0x192,0x192,-1,-1},
  	{0x195,0x195,-1,97},
  	{0x199,0x199,-1,-1},
  	{0x19a,0x19a,-1,163},
  	{0x19e,0x19e,-1,130},
  	{0x1a1,0x1a5,2,-1},
  	{0x1a8,0x1ad,5,-1},
  	{0x1b0,0x1b4,4,-1},
  	{0x1b6,0x1b9,3,-1},
  	{0x1bd,0x1bd,-1,-1},
  	{0x1bf,0x1bf,-1,56},
  	{0x1c5,0x1c5,-1,-1},
  	{0x1c6,0x1c6,-1,-2},
  	{0x1c8,0x1c8,-1,-1},
  	{0x1c9,0x1c9,-1,-2},
  	{0x1cb,0x1cb,-1,-1},
  	{0x1cc,0x1cc,-1,-2},
  	{0x1ce,0x1dc,2,-1},
  	{0x1dd,0x1dd,-1,-79},
  	{0x1df,0x1ef,2,-1},
  	{0x1f2,0x1f2,-1,-1},
  	{0x1f3,0x1f3,-1,-2},
  	{0x1f5,0x1f9,4,-1},
  	{0x1fb,0x21f,2,-1},
  	{0x223,0x233,2,-1},
  	{0x23c,0x23c,-1,-1},
  	{0x23f,0x240,1,10815},
  	{0x242,0x247,5,-1},
  	{0x249,0x24f,2,-1},
  	{0x250,0x250,-1,10783},
  	{0x251,0x251,-1,10780},
  	{0x252,0x252,-1,10782},
  	{0x253,0x253,-1,-210},
  	{0x254,0x254,-1,-206},
  	{0x256,0x257,1,-205},
  	{0x259,0x259,-1,-202},
  	{0x25b,0x25b,-1,-203},
  	{0x25c,0x25c,-1,42319},
  	{0x260,0x260,-1,-205},
  	{0x261,0x261,-1,42315},
  	{0x263,0x263,-1,-207},
  	{0x265,0x265,-1,42280},
  	{0x266,0x266,-1,42308},
  	{0x268,0x268,-1,-209},
  	{0x269,0x269,-1,-211},
  	{0x26a,0x26a,-1,42308},
  	{0x26b,0x26b,-1,10743},
  	{0x26c,0x26c,-1,42305},
  	{0x26f,0x26f,-1,-211},
  	{0x271,0x271,-1,10749},
  	{0x272,0x272,-1,-213},
  	{0x275,0x275,-1,-214},
  	{0x27d,0x27d,-1,10727},
  	{0x280,0x280,-1,-218},
  	{0x282,0x282,-1,42307},
  	{0x283,0x283,-1,-218},
  	{0x287,0x287,-1,42282},
  	{0x288,0x288,-1,-218},
  	{0x289,0x289,-1,-69},
  	{0x28a,0x28b,1,-217},
  	{0x28c,0x28c,-1,-71},
  	{0x292,0x292,-1,-219},
  	{0x29d,0x29d,-1,42261},
  	{0x29e,0x29e,-1,42258},
  	{0x345,0x345,-1,84},
  	{0x371,0x373,2,-1},
  	{0x377,0x377,-1,-1},
  	{0x37b,0x37d,1,130},
  	{0x3ac,0x3ac,-1,-38},
  	{0x3ad,0x3af,1,-37},
  	{0x3b1,0x3c1,1,-32},
  	{0x3c2,0x3c2,-1,-31},
  	{0x3c3,0x3cb,1,-32},
  	{0x3cc,0x3cc,-1,-64},
  	{0x3cd,0x3ce,1,-63},
  	{0x3d0,0x3d0,-1,-62},
  	{0x3d1,0x3d1,-1,-57},
  	{0x3d5,0x3d5,-1,-47},
  	{0x3d6,0x3d6,-1,-54},
  	{0x3d7,0x3d7,-1,-8},
  	{0x3d9,0x3ef,2,-1},
  	{0x3f0,0x3f0,-1,-86},
  	{0x3f1,0x3f1,-1,-80},
  	{0x3f2,0x3f2,-1,7},
  	{0x3f3,0x3f3,-1,-116},
  	{0x3f5,0x3f5,-1,-96},
  	{0x3f8,0x3fb,3,-1},
  	{0x430,0x44f,1,-32},
  	{0x450,0x45f,1,-80},
  	{0x461,0x481,2,-1},
  	{0x48b,0x4bf,2,-1},
  	{0x4c2,0x4ce,2,-1},
  	{0x4cf,0x4cf,-1,-15},
  	{0x4d1,0x52f,2,-1},
  	{0x561,0x586,1,-48},
  	{0x10d0,0x10fa,1,3008},
  	{0x10fd,0x10ff,1,3008},
  	{0x13f8,0x13fd,1,-8},
  	{0x1c80,0x1c80,-1,-6254},
  	{0x1c81,0x1c81,-1,-6253},
  	{0x1c82,0x1c82,-1,-6244},
  	{0x1c83,0x1c84,1,-6242},
  	{0x1c85,0x1c85,-1,-6243},
  	{0x1c86,0x1c86,-1,-6236},
  	{0x1c87,0x1c87,-1,-6181},
  	{0x1c88,0x1c88,-1,35266},
  	{0x1d79,0x1d79,-1,35332},
  	{0x1d7d,0x1d7d,-1,3814},
  	{0x1d8e,0x1d8e,-1,35384},
  	{0x1e01,0x1e95,2,-1},
  	{0x1e9b,0x1e9b,-1,-59},
  	{0x1ea1,0x1eff,2,-1},
  	{0x1f00,0x1f07,1,8},
  	{0x1f10,0x1f15,1,8},
  	{0x1f20,0x1f27,1,8},
  	{0x1f30,0x1f37,1,8},
  	{0x1f40,0x1f45,1,8},
  	{0x1f51,0x1f57,2,8},
  	{0x1f60,0x1f67,1,8},
  	{0x1f70,0x1f71,1,74},
  	{0x1f72,0x1f75,1,86},
  	{0x1f76,0x1f77,1,100},
  	{0x1f78,0x1f79,1,128},
  	{0x1f7a,0x1f7b,1,112},
  	{0x1f7c,0x1f7d,1,126},
  	{0x1f80,0x1f87,1,8},
  	{0x1f90,0x1f97,1,8},
  	{0x1fa0,0x1fa7,1,8},
  	{0x1fb0,0x1fb1,1,8},
  	{0x1fb3,0x1fb3,-1,9},
  	{0x1fbe,0x1fbe,-1,-7205},
  	{0x1fc3,0x1fc3,-1,9},
  	{0x1fd0,0x1fd1,1,8},
  	{0x1fe0,0x1fe1,1,8},
  	{0x1fe5,0x1fe5,-1,7},
  	{0x1ff3,0x1ff3,-1,9},
  	{0x214e,0x214e,-1,-28},
  	{0x2170,0x217f,1,-16},
  	{0x2184,0x2184,-1,-1},
  	{0x24d0,0x24e9,1,-26},
  	{0x2c30,0x2c5e,1,-48},
  	{0x2c61,0x2c61,-1,-1},
  	{0x2c65,0x2c65,-1,-10795},
  	{0x2c66,0x2c66,-1,-10792},
  	{0x2c68,0x2c6c,2,-1},
  	{0x2c73,0x2c76,3,-1},
  	{0x2c81,0x2ce3,2,-1},
  	{0x2cec,0x2cee,2,-1},
  	{0x2cf3,0x2cf3,-1,-1},
  	{0x2d00,0x2d25,1,-7264},
  	{0x2d27,0x2d2d,6,-7264},
  	{0xa641,0xa66d,2,-1},
  	{0xa681,0xa69b,2,-1},
  	{0xa723,0xa72f,2,-1},
  	{0xa733,0xa76f,2,-1},
  	{0xa77a,0xa77c,2,-1},
  	{0xa77f,0xa787,2,-1},
  	{0xa78c,0xa791,5,-1},
  	{0xa793,0xa793,-1,-1},
  	{0xa794,0xa794,-1,48},
  	{0xa797,0xa7a9,2,-1},
  	{0xa7b5,0xa7bf,2,-1},
  	{0xa7c3,0xa7c8,5,-1},
  	{0xa7ca,0xa7f6,44,-1},
  	{0xab53,0xab53,-1,-928},
  	{0xab70,0xabbf,1,-38864},
  	{0xff41,0xff5a,1,-32},
  	{0x10428,0x1044f,1,-40},
  	{0x104d8,0x104fb,1,-40},
  	{0x10cc0,0x10cf2,1,-64},
  	{0x118c0,0x118df,1,-32},
  	{0x16e60,0x16e7f,1,-32},
  	{0x1e922,0x1e943,1,-34}
  };
  
  /*
   * Return the upper-case equivalent of "a", which is a UCS-4 character.  Use
   * simple case folding.
   */
      int
  utf_toupper(int a)
  {
      // If 'casemap' contains "keepascii" use ASCII style toupper().
      if (a < 128 && (cmp_flags & CMP_KEEPASCII))
  	return TOUPPER_ASC(a);
  
  #if defined(HAVE_TOWUPPER) && defined(__STDC_ISO_10646__)
      // If towupper() is available and handles Unicode, use it.
      if (!(cmp_flags & CMP_INTERNAL))
  	return towupper(a);
  #endif
  
      // For characters below 128 use locale sensitive toupper().
      if (a < 128)
  	return TOUPPER_LOC(a);
  
      // For any other characters use the above mapping table.
      return utf_convert(a, toUpper, (int)sizeof(toUpper));
  }
  
      int
  utf_islower(int a)
  {
      // German sharp s is lower case but has no upper case equivalent.
      return (utf_toupper(a) != a) || a == 0xdf;
  }
  
  /*
   * Return the lower-case equivalent of "a", which is a UCS-4 character.  Use
   * simple case folding.
   */
      int
  utf_tolower(int a)
  {
      // If 'casemap' contains "keepascii" use ASCII style tolower().
      if (a < 128 && (cmp_flags & CMP_KEEPASCII))
  	return TOLOWER_ASC(a);
  
  #if defined(HAVE_TOWLOWER) && defined(__STDC_ISO_10646__)
      // If towlower() is available and handles Unicode, use it.
      if (!(cmp_flags & CMP_INTERNAL))
  	return towlower(a);
  #endif
  
      // For characters below 128 use locale sensitive tolower().
      if (a < 128)
  	return TOLOWER_LOC(a);
  
      // For any other characters use the above mapping table.
      return utf_convert(a, toLower, (int)sizeof(toLower));
  }
  
      int
  utf_isupper(int a)
  {
      return (utf_tolower(a) != a);
  }
  
      static int
  utf_strnicmp(
      char_u      *s1,
      char_u      *s2,
      size_t      n1,
      size_t      n2)
  {
      int		c1, c2, cdiff;
      char_u	buffer[6];
  
      for (;;)
      {
  	c1 = utf_safe_read_char_adv(&s1, &n1);
  	c2 = utf_safe_read_char_adv(&s2, &n2);
  
  	if (c1 <= 0 || c2 <= 0)
  	    break;
  
  	if (c1 == c2)
  	    continue;
  
  	cdiff = utf_fold(c1) - utf_fold(c2);
  	if (cdiff != 0)
  	    return cdiff;
      }
  
      // some string ended or has an incomplete/illegal character sequence
  
      if (c1 == 0 || c2 == 0)
      {
  	// some string ended. shorter string is smaller
  	if (c1 == 0 && c2 == 0)
  	    return 0;
  	return c1 == 0 ? -1 : 1;
      }
  
      // Continue with bytewise comparison to produce some result that
      // would make comparison operations involving this function transitive.
      //
      // If only one string had an error, comparison should be made with
      // folded version of the other string. In this case it is enough
      // to fold just one character to determine the result of comparison.
  
      if (c1 != -1 && c2 == -1)
      {
  	n1 = utf_char2bytes(utf_fold(c1), buffer);
  	s1 = buffer;
      }
      else if (c2 != -1 && c1 == -1)
      {
  	n2 = utf_char2bytes(utf_fold(c2), buffer);
  	s2 = buffer;
      }
  
      while (n1 > 0 && n2 > 0 && *s1 != NUL && *s2 != NUL)
      {
  	cdiff = (int)(*s1) - (int)(*s2);
  	if (cdiff != 0)
  	    return cdiff;
  
  	s1++;
  	s2++;
  	n1--;
  	n2--;
      }
  
      if (n1 > 0 && *s1 == NUL)
  	n1 = 0;
      if (n2 > 0 && *s2 == NUL)
  	n2 = 0;
  
      if (n1 == 0 && n2 == 0)
  	return 0;
      return n1 == 0 ? -1 : 1;
  }
  
  /*
   * Version of strnicmp() that handles multi-byte characters.
   * Needed for Big5, Shift-JIS and UTF-8 encoding.  Other DBCS encodings can
   * probably use strnicmp(), because there are no ASCII characters in the
   * second byte.
   * Returns zero if s1 and s2 are equal (ignoring case), the difference between
   * two characters otherwise.
   */
      int
  mb_strnicmp(char_u *s1, char_u *s2, size_t nn)
  {
      int		i, l;
      int		cdiff;
      int		n = (int)nn;
  
      if (enc_utf8)
      {
  	return utf_strnicmp(s1, s2, nn, nn);
      }
      else
      {
  	for (i = 0; i < n; i += l)
  	{
  	    if (s1[i] == NUL && s2[i] == NUL)	// both strings end
  		return 0;
  
  	    l = (*mb_ptr2len)(s1 + i);
  	    if (l <= 1)
  	    {
  		// Single byte: first check normally, then with ignore case.
  		if (s1[i] != s2[i])
  		{
  		    cdiff = MB_TOLOWER(s1[i]) - MB_TOLOWER(s2[i]);
  		    if (cdiff != 0)
  			return cdiff;
  		}
  	    }
  	    else
  	    {
  		// For non-Unicode multi-byte don't ignore case.
  		if (l > n - i)
  		    l = n - i;
  		cdiff = STRNCMP(s1 + i, s2 + i, l);
  		if (cdiff != 0)
  		    return cdiff;
  	    }
  	}
      }
      return 0;
  }
  
  /*
   * "g8": show bytes of the UTF-8 char under the cursor.  Doesn't matter what
   * 'encoding' has been set to.
   */
      void
  show_utf8(void)
  {
      int		len;
      int		rlen = 0;
      char_u	*line;
      int		clen;
      int		i;
  
      // Get the byte length of the char under the cursor, including composing
      // characters.
      line = ml_get_cursor();
      len = utfc_ptr2len(line);
      if (len == 0)
      {
  	msg("NUL");
  	return;
      }
  
      clen = 0;
      for (i = 0; i < len; ++i)
      {
  	if (clen == 0)
  	{
  	    // start of (composing) character, get its length
  	    if (i > 0)
  	    {
  		STRCPY(IObuff + rlen, "+ ");
  		rlen += 2;
  	    }
  	    clen = utf_ptr2len(line + i);
  	}
  	sprintf((char *)IObuff + rlen, "%02x ",
  		(line[i] == NL) ? NUL : line[i]);  // NUL is stored as NL
  	--clen;
  	rlen += (int)STRLEN(IObuff + rlen);
  	if (rlen > IOSIZE - 20)
  	    break;
      }
  
      msg((char *)IObuff);
  }
  
  /*
   * mb_head_off() function pointer.
   * Return offset from "p" to the first byte of the character it points into.
   * If "p" points to the NUL at the end of the string return 0.
   * Returns 0 when already at the first byte of a character.
   */
      int
  latin_head_off(char_u *base UNUSED, char_u *p UNUSED)
  {
      return 0;
  }
  
      static int
  dbcs_head_off(char_u *base, char_u *p)
  {
      char_u	*q;
  
      // It can't be a trailing byte when not using DBCS, at the start of the
      // string or the previous byte can't start a double-byte.
      if (p <= base || MB_BYTE2LEN(p[-1]) == 1 || *p == NUL)
  	return 0;
  
      // This is slow: need to start at the base and go forward until the
      // byte we are looking for.  Return 1 when we went past it, 0 otherwise.
      q = base;
      while (q < p)
  	q += dbcs_ptr2len(q);
      return (q == p) ? 0 : 1;
  }
  
  /*
   * Special version of dbcs_head_off() that works for ScreenLines[], where
   * single-width DBCS_JPNU characters are stored separately.
   */
      int
  dbcs_screen_head_off(char_u *base, char_u *p)
  {
      char_u	*q;
  
      // It can't be a trailing byte when not using DBCS, at the start of the
      // string or the previous byte can't start a double-byte.
      // For euc-jp an 0x8e byte in the previous cell always means we have a
      // lead byte in the current cell.
      if (p <= base
  	    || (enc_dbcs == DBCS_JPNU && p[-1] == 0x8e)
  	    || MB_BYTE2LEN(p[-1]) == 1
  	    || *p == NUL)
  	return 0;
  
      // This is slow: need to start at the base and go forward until the
      // byte we are looking for.  Return 1 when we went past it, 0 otherwise.
      // For DBCS_JPNU look out for 0x8e, which means the second byte is not
      // stored as the next byte.
      q = base;
      while (q < p)
      {
  	if (enc_dbcs == DBCS_JPNU && *q == 0x8e)
  	    ++q;
  	else
  	    q += dbcs_ptr2len(q);
      }
      return (q == p) ? 0 : 1;
  }
  
  /*
   * Return offset from "p" to the start of a character, including composing
   * characters.  "base" must be the start of the string, which must be NUL
   * terminated.
   */
      int
  utf_head_off(char_u *base, char_u *p)
  {
      char_u	*q;
      char_u	*s;
      int		c;
      int		len;
  #ifdef FEAT_ARABIC
      char_u	*j;
  #endif
  
      if (*p < 0x80)		// be quick for ASCII
  	return 0;
  
      // Skip backwards over trailing bytes: 10xx.xxxx
      // Skip backwards again if on a composing char.
      for (q = p; ; --q)
      {
  	// Move s to the last byte of this char.
  	for (s = q; (s[1] & 0xc0) == 0x80; ++s)
  	    ;
  	// Move q to the first byte of this char.
  	while (q > base && (*q & 0xc0) == 0x80)
  	    --q;
  	// Check for illegal sequence. Do allow an illegal byte after where we
  	// started.
  	len = utf8len_tab[*q];
  	if (len != (int)(s - q + 1) && len != (int)(p - q + 1))
  	    return 0;
  
  	if (q <= base)
  	    break;
  
  	c = utf_ptr2char(q);
  	if (utf_iscomposing(c))
  	    continue;
  
  #ifdef FEAT_ARABIC
  	if (arabic_maycombine(c))
  	{
  	    // Advance to get a sneak-peak at the next char
  	    j = q;
  	    --j;
  	    // Move j to the first byte of this char.
  	    while (j > base && (*j & 0xc0) == 0x80)
  		--j;
  	    if (arabic_combine(utf_ptr2char(j), c))
  		continue;
  	}
  #endif
  	break;
      }
  
      return (int)(p - q);
  }
  
  /*
   * Whether space is NOT allowed before/after 'c'.
   */
      int
  utf_eat_space(int cc)
  {
      return ((cc >= 0x2000 && cc <= 0x206F)	// General punctuations
  	 || (cc >= 0x2e00 && cc <= 0x2e7f)	// Supplemental punctuations
  	 || (cc >= 0x3000 && cc <= 0x303f)	// CJK symbols and punctuations
  	 || (cc >= 0xff01 && cc <= 0xff0f)	// Full width ASCII punctuations
  	 || (cc >= 0xff1a && cc <= 0xff20)	// ..
  	 || (cc >= 0xff3b && cc <= 0xff40)	// ..
  	 || (cc >= 0xff5b && cc <= 0xff65));	// ..
  }
  
  /*
   * Whether line break is allowed before "cc".
   */
      int
  utf_allow_break_before(int cc)
  {
      static const int BOL_prohibition_punct[] =
      {
  	'!',
  	'%',
  	')',
  	',',
  	':',
  	';',
  	'>',
  	'?',
  	']',
  	'}',
  	0x2019, // ’ right single quotation mark
  	0x201d, // ” right double quotation mark
  	0x2020, // † dagger
  	0x2021, // ‡ double dagger
  	0x2026, // … horizontal ellipsis
  	0x2030, // ‰ per mille sign
  	0x2031, // ‱ per then thousand sign
  	0x203c, // ‼ double exclamation mark
  	0x2047, // ⁇ double question mark
  	0x2048, // ⁈ question exclamation mark
  	0x2049, // ⁉ exclamation question mark
  	0x2103, // ℃ degree celsius
  	0x2109, // ℉ degree fahrenheit
  	0x3001, // 、 ideographic comma
  	0x3002, // 。 ideographic full stop
  	0x3009, // 〉 right angle bracket
  	0x300b, // 》 right double angle bracket
  	0x300d, // 」 right corner bracket
  	0x300f, // 』 right white corner bracket
  	0x3011, // 】 right black lenticular bracket
  	0x3015, // 〕 right tortoise shell bracket
  	0x3017, // 〗 right white lenticular bracket
  	0x3019, // 〙 right white tortoise shell bracket
  	0x301b, // 〛 right white square bracket
  	0xff01, // ！ fullwidth exclamation mark
  	0xff09, // ） fullwidth right parenthesis
  	0xff0c, // ， fullwidth comma
  	0xff0e, // ． fullwidth full stop
  	0xff1a, // ： fullwidth colon
  	0xff1b, // ； fullwidth semicolon
  	0xff1f, // ？ fullwidth question mark
  	0xff3d, // ］ fullwidth right square bracket
  	0xff5d, // ｝ fullwidth right curly bracket
      };
  
      int first = 0;
      int last  = ARRAY_LENGTH(BOL_prohibition_punct) - 1;
      int mid   = 0;
  
      while (first < last)
      {
  	mid = (first + last)/2;
  
  	if (cc == BOL_prohibition_punct[mid])
  	    return FALSE;
  	else if (cc > BOL_prohibition_punct[mid])
  	    first = mid + 1;
  	else
  	    last = mid - 1;
      }
  
      return cc != BOL_prohibition_punct[first];
  }
  
  /*
   * Whether line break is allowed after "cc".
   */
      static int
  utf_allow_break_after(int cc)
  {
      static const int EOL_prohibition_punct[] =
      {
  	'(',
  	'<',
  	'[',
  	'`',
  	'{',
  	//0x2014, // — em dash
  	0x2018, // ‘ left single quotation mark
  	0x201c, // “ left double quotation mark
  	//0x2053, // ～ swung dash
  	0x3008, // 〈 left angle bracket
  	0x300a, // 《 left double angle bracket
  	0x300c, // 「 left corner bracket
  	0x300e, // 『 left white corner bracket
  	0x3010, // 【 left black lenticular bracket
  	0x3014, // 〔 left tortoise shell bracket
  	0x3016, // 〖 left white lenticular bracket
  	0x3018, // 〘 left white tortoise shell bracket
  	0x301a, // 〚 left white square bracket
  	0xff08, // （ fullwidth left parenthesis
  	0xff3b, // ［ fullwidth left square bracket
  	0xff5b, // ｛ fullwidth left curly bracket
      };
  
      int first = 0;
      int last  = ARRAY_LENGTH(EOL_prohibition_punct) - 1;
      int mid   = 0;
  
      while (first < last)
      {
  	mid = (first + last)/2;
  
  	if (cc == EOL_prohibition_punct[mid])
  	    return FALSE;
  	else if (cc > EOL_prohibition_punct[mid])
  	    first = mid + 1;
  	else
  	    last = mid - 1;
      }
  
      return cc != EOL_prohibition_punct[first];
  }
  
  /*
   * Whether line break is allowed between "cc" and "ncc".
   */
      int
  utf_allow_break(int cc, int ncc)
  {
      // don't break between two-letter punctuations
      if (cc == ncc
  	    && (cc == 0x2014 // em dash
  		|| cc == 0x2026)) // horizontal ellipsis
  	return FALSE;
  
      return utf_allow_break_after(cc) && utf_allow_break_before(ncc);
  }
  
  /*
   * Copy a character from "*fp" to "*tp" and advance the pointers.
   */
      void
  mb_copy_char(char_u **fp, char_u **tp)
  {
      int	    l = (*mb_ptr2len)(*fp);
  
      mch_memmove(*tp, *fp, (size_t)l);
      *tp += l;
      *fp += l;
  }
  
  /*
   * Return the offset from "p" to the first byte of a character.  When "p" is
   * at the start of a character 0 is returned, otherwise the offset to the next
   * character.  Can start anywhere in a stream of bytes.
   */
      int
  mb_off_next(char_u *base, char_u *p)
  {
      int		i;
      int		j;
  
      if (enc_utf8)
      {
  	if (*p < 0x80)		// be quick for ASCII
  	    return 0;
  
  	// Find the next character that isn't 10xx.xxxx
  	for (i = 0; (p[i] & 0xc0) == 0x80; ++i)
  	    ;
  	if (i > 0)
  	{
  	    // Check for illegal sequence.
  	    for (j = 0; p - j > base; ++j)
  		if ((p[-j] & 0xc0) != 0x80)
  		    break;
  	    if (utf8len_tab[p[-j]] != i + j)
  		return 0;
  	}
  	return i;
      }
  
      // Only need to check if we're on a trail byte, it doesn't matter if we
      // want the offset to the next or current character.
      return (*mb_head_off)(base, p);
  }
  
  /*
   * Return the offset from "p" to the last byte of the character it points
   * into.  Can start anywhere in a stream of bytes.
   * Composing characters are not included.
   */
      int
  mb_tail_off(char_u *base, char_u *p)
  {
      int		i;
      int		j;
  
      if (*p == NUL)
  	return 0;
  
      if (enc_utf8)
      {
  	// Find the last character that is 10xx.xxxx
  	for (i = 0; (p[i + 1] & 0xc0) == 0x80; ++i)
  	    ;
  	// Check for illegal sequence.
  	for (j = 0; p - j > base; ++j)
  	    if ((p[-j] & 0xc0) != 0x80)
  		break;
  	if (utf8len_tab[p[-j]] != i + j + 1)
  	    return 0;
  	return i;
      }
  
      // It can't be the first byte if a double-byte when not using DBCS, at the
      // end of the string or the byte can't start a double-byte.
      if (enc_dbcs == 0 || p[1] == NUL || MB_BYTE2LEN(*p) == 1)
  	return 0;
  
      // Return 1 when on the lead byte, 0 when on the tail byte.
      return 1 - dbcs_head_off(base, p);
  }
  
  /*
   * Find the next illegal byte sequence.
   */
      void
  utf_find_illegal(void)
  {
      pos_T	pos = curwin->w_cursor;
      char_u	*p;
      int		len;
      vimconv_T	vimconv;
      char_u	*tofree = NULL;
  
      vimconv.vc_type = CONV_NONE;
      if (enc_utf8 && (enc_canon_props(curbuf->b_p_fenc) & ENC_8BIT))
      {
  	// 'encoding' is "utf-8" but we are editing a 8-bit encoded file,
  	// possibly a utf-8 file with illegal bytes.  Setup for conversion
  	// from utf-8 to 'fileencoding'.
  	convert_setup(&vimconv, p_enc, curbuf->b_p_fenc);
      }
  
      curwin->w_cursor.coladd = 0;
      for (;;)
      {
  	p = ml_get_cursor();
  	if (vimconv.vc_type != CONV_NONE)
  	{
  	    vim_free(tofree);
  	    tofree = string_convert(&vimconv, p, NULL);
  	    if (tofree == NULL)
  		break;
  	    p = tofree;
  	}
  
  	while (*p != NUL)
  	{
  	    // Illegal means that there are not enough trail bytes (checked by
  	    // utf_ptr2len()) or too many of them (overlong sequence).
  	    len = utf_ptr2len(p);
  	    if (*p >= 0x80 && (len == 1
  				     || utf_char2len(utf_ptr2char(p)) != len))
  	    {
  		if (vimconv.vc_type == CONV_NONE)
  		    curwin->w_cursor.col += (colnr_T)(p - ml_get_cursor());
  		else
  		{
  		    int	    l;
  
  		    len = (int)(p - tofree);
  		    for (p = ml_get_cursor(); *p != NUL && len-- > 0; p += l)
  		    {
  			l = utf_ptr2len(p);
  			curwin->w_cursor.col += l;
  		    }
  		}
  		goto theend;
  	    }
  	    p += len;
  	}
  	if (curwin->w_cursor.lnum == curbuf->b_ml.ml_line_count)
  	    break;
  	++curwin->w_cursor.lnum;
  	curwin->w_cursor.col = 0;
      }
  
      // didn't find it: don't move and beep
      curwin->w_cursor = pos;
      beep_flush();
  
  theend:
      vim_free(tofree);
      convert_setup(&vimconv, NULL, NULL);
  }
  
  #if defined(FEAT_GUI_GTK) || defined(PROTO)
  /*
   * Return TRUE if string "s" is a valid utf-8 string.
   * When "end" is NULL stop at the first NUL.
   * When "end" is positive stop there.
   */
      int
  utf_valid_string(char_u *s, char_u *end)
  {
      int		l;
      char_u	*p = s;
  
      while (end == NULL ? *p != NUL : p < end)
      {
  	l = utf8len_tab_zero[*p];
  	if (l == 0)
  	    return FALSE;	// invalid lead byte
  	if (end != NULL && p + l > end)
  	    return FALSE;	// incomplete byte sequence
  	++p;
  	while (--l > 0)
  	    if ((*p++ & 0xc0) != 0x80)
  		return FALSE;	// invalid trail byte
      }
      return TRUE;
  }
  #endif
  
  #if defined(FEAT_GUI) || defined(PROTO)
  /*
   * Special version of mb_tail_off() for use in ScreenLines[].
   */
      int
  dbcs_screen_tail_off(char_u *base, char_u *p)
  {
      // It can't be the first byte if a double-byte when not using DBCS, at the
      // end of the string or the byte can't start a double-byte.
      // For euc-jp an 0x8e byte always means we have a lead byte in the current
      // cell.
      if (*p == NUL || p[1] == NUL
  	    || (enc_dbcs == DBCS_JPNU && *p == 0x8e)
  	    || MB_BYTE2LEN(*p) == 1)
  	return 0;
  
      // Return 1 when on the lead byte, 0 when on the tail byte.
      return 1 - dbcs_screen_head_off(base, p);
  }
  #endif
  
  /*
   * If the cursor moves on an trail byte, set the cursor on the lead byte.
   * Thus it moves left if necessary.
   * Return TRUE when the cursor was adjusted.
   */
      void
  mb_adjust_cursor(void)
  {
      mb_adjustpos(curbuf, &curwin->w_cursor);
  }
  
  /*
   * Adjust position "*lp" to point to the first byte of a multi-byte character.
   * If it points to a tail byte it's moved backwards to the head byte.
   */
      void
  mb_adjustpos(buf_T *buf, pos_T *lp)
  {
      char_u	*p;
  
      if (lp->col > 0 || lp->coladd > 1)
      {
  	p = ml_get_buf(buf, lp->lnum, FALSE);
  	if (*p == NUL || (int)STRLEN(p) < lp->col)
  	    lp->col = 0;
  	else
  	    lp->col -= (*mb_head_off)(p, p + lp->col);
  	// Reset "coladd" when the cursor would be on the right half of a
  	// double-wide character.
  	if (lp->coladd == 1
  		&& p[lp->col] != TAB
  		&& vim_isprintc((*mb_ptr2char)(p + lp->col))
  		&& ptr2cells(p + lp->col) > 1)
  	    lp->coladd = 0;
      }
  }
  
  /*
   * Return a pointer to the character before "*p", if there is one.
   */
      char_u *
  mb_prevptr(
      char_u *line,	// start of the string
      char_u *p)
  {
      if (p > line)
  	MB_PTR_BACK(line, p);
      return p;
  }
  
  /*
   * Return the character length of "str".  Each multi-byte character (with
   * following composing characters) counts as one.
   */
      int
  mb_charlen(char_u *str)
  {
      char_u	*p = str;
      int		count;
  
      if (p == NULL)
  	return 0;
  
      for (count = 0; *p != NUL; count++)
  	p += (*mb_ptr2len)(p);
  
      return count;
  }
  
  /*
   * Like mb_charlen() but for a string with specified length.
   */
      int
  mb_charlen_len(char_u *str, int len)
  {
      char_u	*p = str;
      int		count;
  
      for (count = 0; *p != NUL && p < str + len; count++)
  	p += (*mb_ptr2len)(p);
  
      return count;
  }
  
  /*
   * Try to un-escape a multi-byte character.
   * Used for the "to" and "from" part of a mapping.
   * Return the un-escaped string if it is a multi-byte character, and advance
   * "pp" to just after the bytes that formed it.
   * Return NULL if no multi-byte char was found.
   */
      char_u *
  mb_unescape(char_u **pp)
  {
      static char_u	buf[6];
      int			n;
      int			m = 0;
      char_u		*str = *pp;
  
      // Must translate K_SPECIAL KS_SPECIAL KE_FILLER to K_SPECIAL and CSI
      // KS_EXTRA KE_CSI to CSI.
      // Maximum length of a utf-8 character is 4 bytes.
      for (n = 0; str[n] != NUL && m < 4; ++n)
      {
  	if (str[n] == K_SPECIAL
  		&& str[n + 1] == KS_SPECIAL
  		&& str[n + 2] == KE_FILLER)
  	{
  	    buf[m++] = K_SPECIAL;
  	    n += 2;
  	}
  	else if ((str[n] == K_SPECIAL
  # ifdef FEAT_GUI
  		    || str[n] == CSI
  # endif
  		 )
  		&& str[n + 1] == KS_EXTRA
  		&& str[n + 2] == (int)KE_CSI)
  	{
  	    buf[m++] = CSI;
  	    n += 2;
  	}
  	else if (str[n] == K_SPECIAL
  # ifdef FEAT_GUI
  		|| str[n] == CSI
  # endif
  		)
  	    break;		// a special key can't be a multibyte char
  	else
  	    buf[m++] = str[n];
  	buf[m] = NUL;
  
  	// Return a multi-byte character if it's found.  An illegal sequence
  	// will result in a 1 here.
  	if ((*mb_ptr2len)(buf) > 1)
  	{
  	    *pp = str + n + 1;
  	    return buf;
  	}
  
  	// Bail out quickly for ASCII.
  	if (buf[0] < 128)
  	    break;
      }
      return NULL;
  }
  
  /*
   * Return TRUE if the character at "row"/"col" on the screen is the left side
   * of a double-width character.
   * Caller must make sure "row" and "col" are not invalid!
   */
      int
  mb_lefthalve(int row, int col)
  {
      return (*mb_off2cells)(LineOffset[row] + col,
  					LineOffset[row] + screen_Columns) > 1;
  }
  
  /*
   * Correct a position on the screen, if it's the right half of a double-wide
   * char move it to the left half.  Returns the corrected column.
   */
      int
  mb_fix_col(int col, int row)
  {
      int off;
  
      col = check_col(col);
      row = check_row(row);
      off = LineOffset[row] + col;
      if (has_mbyte && ScreenLines != NULL && col > 0
  	    && ((enc_dbcs
  		    && ScreenLines[off] != NUL
  		    && dbcs_screen_head_off(ScreenLines + LineOffset[row],
  					 ScreenLines + off))
  		|| (enc_utf8 && ScreenLines[off] == 0
  						  && ScreenLinesUC[off] == 0)))
  	return col - 1;
      return col;
  }
  
  static int enc_alias_search(char_u *name);
  
  /*
   * Skip the Vim specific head of a 'encoding' name.
   */
      char_u *
  enc_skip(char_u *p)
  {
      if (STRNCMP(p, "2byte-", 6) == 0)
  	return p + 6;
      if (STRNCMP(p, "8bit-", 5) == 0)
  	return p + 5;
      return p;
  }
  
  /*
   * Find the canonical name for encoding "enc".
   * When the name isn't recognized, returns "enc" itself, but with all lower
   * case characters and '_' replaced with '-'.
   * Returns an allocated string.  NULL for out-of-memory.
   */
      char_u *
  enc_canonize(char_u *enc)
  {
      char_u	*r;
      char_u	*p, *s;
      int		i;
  
      if (STRCMP(enc, "default") == 0)
      {
  #ifdef MSWIN
  	// Use the system encoding, the default is always utf-8.
  	r = enc_locale();
  #else
  	// Use the default encoding as it's found by set_init_1().
  	r = get_encoding_default();
  #endif
  	if (r == NULL)
  	    r = (char_u *)ENC_DFLT;
  	return vim_strsave(r);
      }
  
      // copy "enc" to allocated memory, with room for two '-'
      r = alloc(STRLEN(enc) + 3);
      if (r != NULL)
      {
  	// Make it all lower case and replace '_' with '-'.
  	p = r;
  	for (s = enc; *s != NUL; ++s)
  	{
  	    if (*s == '_')
  		*p++ = '-';
  	    else
  		*p++ = TOLOWER_ASC(*s);
  	}
  	*p = NUL;
  
  	// Skip "2byte-" and "8bit-".
  	p = enc_skip(r);
  
  	// Change "microsoft-cp" to "cp".  Used in some spell files.
  	if (STRNCMP(p, "microsoft-cp", 12) == 0)
  	    STRMOVE(p, p + 10);
  
  	// "iso8859" -> "iso-8859"
  	if (STRNCMP(p, "iso8859", 7) == 0)
  	{
  	    STRMOVE(p + 4, p + 3);
  	    p[3] = '-';
  	}
  
  	// "iso-8859n" -> "iso-8859-n"
  	if (STRNCMP(p, "iso-8859", 8) == 0 && isdigit(p[8]))
  	{
  	    STRMOVE(p + 9, p + 8);
  	    p[8] = '-';
  	}
  
  	// "latin-N" -> "latinN"
  	if (STRNCMP(p, "latin-", 6) == 0)
  	    STRMOVE(p + 5, p + 6);
  
  	if (enc_canon_search(p) >= 0)
  	{
  	    // canonical name can be used unmodified
  	    if (p != r)
  		STRMOVE(r, p);
  	}
  	else if ((i = enc_alias_search(p)) >= 0)
  	{
  	    // alias recognized, get canonical name
  	    vim_free(r);
  	    r = vim_strsave((char_u *)enc_canon_table[i].name);
  	}
      }
      return r;
  }
  
  /*
   * Search for an encoding alias of "name".
   * Returns -1 when not found.
   */
      static int
  enc_alias_search(char_u *name)
  {
      int		i;
  
      for (i = 0; enc_alias_table[i].name != NULL; ++i)
  	if (STRCMP(name, enc_alias_table[i].name) == 0)
  	    return enc_alias_table[i].canon;
      return -1;
  }
  
  
  #ifdef HAVE_LANGINFO_H
  # include <langinfo.h>
  #endif
  
  #if !defined(FEAT_GUI_MSWIN) || defined(VIMDLL)
  /*
   * Get the canonicalized encoding from the specified locale string "locale"
   * or from the environment variables LC_ALL, LC_CTYPE and LANG.
   * Returns an allocated string when successful, NULL when not.
   */
      char_u *
  enc_locale_env(char *locale)
  {
      char	*s = locale;
      char	*p;
      int		i;
      char	buf[50];
  
      if (s == NULL || *s == NUL)
  	if ((s = getenv("LC_ALL")) == NULL || *s == NUL)
  	    if ((s = getenv("LC_CTYPE")) == NULL || *s == NUL)
  		s = getenv("LANG");
  
      if (s == NULL || *s == NUL)
  	return NULL;
  
      // The most generic locale format is:
      // language[_territory][.codeset][@modifier][+special][,[sponsor][_revision]]
      // If there is a '.' remove the part before it.
      // if there is something after the codeset, remove it.
      // Make the name lowercase and replace '_' with '-'.
      // Exception: "ja_JP.EUC" == "euc-jp", "zh_CN.EUC" = "euc-cn",
      // "ko_KR.EUC" == "euc-kr"
      if ((p = (char *)vim_strchr((char_u *)s, '.')) != NULL)
      {
  	if (p > s + 2 && STRNICMP(p + 1, "EUC", 3) == 0
  			&& !isalnum((int)p[4]) && p[4] != '-' && p[-3] == '_')
  	{
  	    // copy "XY.EUC" to "euc-XY" to buf[10]
  	    STRCPY(buf + 10, "euc-");
  	    buf[14] = p[-2];
  	    buf[15] = p[-1];
  	    buf[16] = 0;
  	    s = buf + 10;
  	}
  	else
  	    s = p + 1;
      }
      for (i = 0; i < (int)sizeof(buf) - 1 && s[i] != NUL; ++i)
      {
  	if (s[i] == '_' || s[i] == '-')
  	    buf[i] = '-';
  	else if (isalnum((int)s[i]))
  	    buf[i] = TOLOWER_ASC(s[i]);
  	else
  	    break;
      }
      buf[i] = NUL;
  
      return enc_canonize((char_u *)buf);
  }
  #endif
  
  /*
   * Get the canonicalized encoding of the current locale.
   * Returns an allocated string when successful, NULL when not.
   */
      char_u *
  enc_locale(void)
  {
  #ifdef MSWIN
      char	buf[50];
      long	acp = GetACP();
  
      if (acp == 1200)
  	STRCPY(buf, "ucs-2le");
      else if (acp == 1252)	    // cp1252 is used as latin1
  	STRCPY(buf, "latin1");
      else if (acp == 65001)
  	STRCPY(buf, "utf-8");
      else
  	sprintf(buf, "cp%ld", acp);
  
      return enc_canonize((char_u *)buf);
  #else
      char	*s;
  
  # ifdef HAVE_NL_LANGINFO_CODESET
      if ((s = nl_langinfo(CODESET)) == NULL || *s == NUL)
  # endif
  # if defined(HAVE_LOCALE_H) || defined(X_LOCALE)
  	if ((s = setlocale(LC_CTYPE, NULL)) == NULL || *s == NUL)
  # endif
  	    s = NULL;
  
      return enc_locale_env(s);
  #endif
  }
  
  # if defined(MSWIN) || defined(PROTO) || defined(FEAT_CYGWIN_WIN32_CLIPBOARD)
  /*
   * Convert an encoding name to an MS-Windows codepage.
   * Returns zero if no codepage can be figured out.
   */
      int
  encname2codepage(char_u *name)
  {
      int		cp;
      char_u	*p = name;
      int		idx;
  
      if (STRNCMP(p, "8bit-", 5) == 0)
  	p += 5;
      else if (STRNCMP(p_enc, "2byte-", 6) == 0)
  	p += 6;
  
      if (p[0] == 'c' && p[1] == 'p')
  	cp = atoi((char *)p + 2);
      else if ((idx = enc_canon_search(p)) >= 0)
  	cp = enc_canon_table[idx].codepage;
      else
  	return 0;
      if (IsValidCodePage(cp))
  	return cp;
      return 0;
  }
  # endif
  
  # if defined(USE_ICONV) || defined(PROTO)
  
  /*
   * Call iconv_open() with a check if iconv() works properly (there are broken
   * versions).
   * Returns (void *)-1 if failed.
   * (should return iconv_t, but that causes problems with prototypes).
   */
      void *
  my_iconv_open(char_u *to, char_u *from)
  {
      iconv_t	fd;
  #define ICONV_TESTLEN 400
      char_u	tobuf[ICONV_TESTLEN];
      char	*p;
      size_t	tolen;
      static int	iconv_ok = -1;
  
      if (iconv_ok == FALSE)
  	return (void *)-1;	// detected a broken iconv() previously
  
  #ifdef DYNAMIC_ICONV
      // Check if the iconv.dll can be found.
      if (!iconv_enabled(TRUE))
  	return (void *)-1;
  #endif
  
      fd = iconv_open((char *)enc_skip(to), (char *)enc_skip(from));
  
      if (fd != (iconv_t)-1 && iconv_ok == -1)
      {
  	/*
  	 * Do a dummy iconv() call to check if it actually works.  There is a
  	 * version of iconv() on Linux that is broken.  We can't ignore it,
  	 * because it's wide-spread.  The symptoms are that after outputting
  	 * the initial shift state the "to" pointer is NULL and conversion
  	 * stops for no apparent reason after about 8160 characters.
  	 */
  	p = (char *)tobuf;
  	tolen = ICONV_TESTLEN;
  	(void)iconv(fd, NULL, NULL, &p, &tolen);
  	if (p == NULL)
  	{
  	    iconv_ok = FALSE;
  	    iconv_close(fd);
  	    fd = (iconv_t)-1;
  	}
  	else
  	    iconv_ok = TRUE;
      }
  
      return (void *)fd;
  }
  
  /*
   * Convert the string "str[slen]" with iconv().
   * If "unconvlenp" is not NULL handle the string ending in an incomplete
   * sequence and set "*unconvlenp" to the length of it.
   * Returns the converted string in allocated memory.  NULL for an error.
   * If resultlenp is not NULL, sets it to the result length in bytes.
   */
      static char_u *
  iconv_string(
      vimconv_T	*vcp,
      char_u	*str,
      int		slen,
      int		*unconvlenp,
      int		*resultlenp)
  {
      const char	*from;
      size_t	fromlen;
      char	*to;
      size_t	tolen;
      size_t	len = 0;
      size_t	done = 0;
      char_u	*result = NULL;
      char_u	*p;
      int		l;
  
      from = (char *)str;
      fromlen = slen;
      for (;;)
      {
  	if (len == 0 || ICONV_ERRNO == ICONV_E2BIG)
  	{
  	    // Allocate enough room for most conversions.  When re-allocating
  	    // increase the buffer size.
  	    len = len + fromlen * 2 + 40;
  	    p = alloc(len);
  	    if (p != NULL && done > 0)
  		mch_memmove(p, result, done);
  	    vim_free(result);
  	    result = p;
  	    if (result == NULL)	// out of memory
  		break;
  	}
  
  	to = (char *)result + done;
  	tolen = len - done - 2;
  	// Avoid a warning for systems with a wrong iconv() prototype by
  	// casting the second argument to void *.
  	if (iconv(vcp->vc_fd, (void *)&from, &fromlen, &to, &tolen)
  								!= (size_t)-1)
  	{
  	    // Finished, append a NUL.
  	    *to = NUL;
  	    break;
  	}
  
  	// Check both ICONV_EINVAL and EINVAL, because the dynamically loaded
  	// iconv library may use one of them.
  	if (!vcp->vc_fail && unconvlenp != NULL
  		&& (ICONV_ERRNO == ICONV_EINVAL || ICONV_ERRNO == EINVAL))
  	{
  	    // Handle an incomplete sequence at the end.
  	    *to = NUL;
  	    *unconvlenp = (int)fromlen;
  	    break;
  	}
  
  	// Check both ICONV_EILSEQ and EILSEQ, because the dynamically loaded
  	// iconv library may use one of them.
  	else if (!vcp->vc_fail
  		&& (ICONV_ERRNO == ICONV_EILSEQ || ICONV_ERRNO == EILSEQ
  		    || ICONV_ERRNO == ICONV_EINVAL || ICONV_ERRNO == EINVAL))
  	{
  	    // Can't convert: insert a '?' and skip a character.  This assumes
  	    // conversion from 'encoding' to something else.  In other
  	    // situations we don't know what to skip anyway.
  	    *to++ = '?';
  	    if ((*mb_ptr2cells)((char_u *)from) > 1)
  		*to++ = '?';
  	    if (enc_utf8)
  		l = utfc_ptr2len_len((char_u *)from, (int)fromlen);
  	    else
  	    {
  		l = (*mb_ptr2len)((char_u *)from);
  		if (l > (int)fromlen)
  		    l = (int)fromlen;
  	    }
  	    from += l;
  	    fromlen -= l;
  	}
  	else if (ICONV_ERRNO != ICONV_E2BIG)
  	{
  	    // conversion failed
  	    VIM_CLEAR(result);
  	    break;
  	}
  	// Not enough room or skipping illegal sequence.
  	done = to - (char *)result;
      }
  
      if (resultlenp != NULL && result != NULL)
  	*resultlenp = (int)(to - (char *)result);
      return result;
  }
  
  #  if defined(DYNAMIC_ICONV) || defined(PROTO)
  /*
   * Dynamically load the "iconv.dll" on Win32.
   */
  
  #   ifndef DYNAMIC_ICONV	    // must be generating prototypes
  #    define HINSTANCE int
  #   endif
  static HINSTANCE hIconvDLL = 0;
  static HINSTANCE hMsvcrtDLL = 0;
  
  #   ifndef DYNAMIC_ICONV_DLL
  #    define DYNAMIC_ICONV_DLL "iconv.dll"
  #    define DYNAMIC_ICONV_DLL_ALT1 "libiconv.dll"
  #    define DYNAMIC_ICONV_DLL_ALT2 "libiconv2.dll"
  #    define DYNAMIC_ICONV_DLL_ALT3 "libiconv-2.dll"
  #   endif
  #   ifndef DYNAMIC_MSVCRT_DLL
  #    define DYNAMIC_MSVCRT_DLL "msvcrt.dll"
  #   endif
  
  /*
   * Try opening the iconv.dll and return TRUE if iconv() can be used.
   */
      int
  iconv_enabled(int verbose)
  {
      if (hIconvDLL != 0 && hMsvcrtDLL != 0)
  	return TRUE;
  
      // The iconv DLL file goes under different names, try them all.
      // Do the "2" version first, it's newer.
  #ifdef DYNAMIC_ICONV_DLL_ALT2
      if (hIconvDLL == 0)
  	hIconvDLL = vimLoadLib(DYNAMIC_ICONV_DLL_ALT2);
  #endif
  #ifdef DYNAMIC_ICONV_DLL_ALT3
      if (hIconvDLL == 0)
  	hIconvDLL = vimLoadLib(DYNAMIC_ICONV_DLL_ALT3);
  #endif
      if (hIconvDLL == 0)
  	hIconvDLL = vimLoadLib(DYNAMIC_ICONV_DLL);
  #ifdef DYNAMIC_ICONV_DLL_ALT1
      if (hIconvDLL == 0)
  	hIconvDLL = vimLoadLib(DYNAMIC_ICONV_DLL_ALT1);
  #endif
  
      if (hIconvDLL != 0)
  	hMsvcrtDLL = vimLoadLib(DYNAMIC_MSVCRT_DLL);
      if (hIconvDLL == 0 || hMsvcrtDLL == 0)
      {
  	// Only give the message when 'verbose' is set, otherwise it might be
  	// done whenever a conversion is attempted.
  	if (verbose && p_verbose > 0)
  	{
  	    verbose_enter();
  	    semsg(_(e_could_not_load_library_str_str),
  		    hIconvDLL == 0 ? DYNAMIC_ICONV_DLL : DYNAMIC_MSVCRT_DLL,
  		    GetWin32Error());
  	    verbose_leave();
  	}
  	iconv_end();
  	return FALSE;
      }
  
      iconv	= (void *)GetProcAddress(hIconvDLL, "libiconv");
      iconv_open	= (void *)GetProcAddress(hIconvDLL, "libiconv_open");
      iconv_close	= (void *)GetProcAddress(hIconvDLL, "libiconv_close");
      iconvctl	= (void *)GetProcAddress(hIconvDLL, "libiconvctl");
      iconv_errno	= get_dll_import_func(hIconvDLL, "_errno");
      if (iconv_errno == NULL)
  	iconv_errno = (void *)GetProcAddress(hMsvcrtDLL, "_errno");
      if (iconv == NULL || iconv_open == NULL || iconv_close == NULL
  	    || iconvctl == NULL || iconv_errno == NULL)
      {
  	iconv_end();
  	if (verbose && p_verbose > 0)
  	{
  	    verbose_enter();
  	    semsg(_(e_could_not_load_library_function_str), "for libiconv");
  	    verbose_leave();
  	}
  	return FALSE;
      }
      return TRUE;
  }
  
      void
  iconv_end(void)
  {
      // Don't use iconv() when inputting or outputting characters.
      if (input_conv.vc_type == CONV_ICONV)
  	convert_setup(&input_conv, NULL, NULL);
      if (output_conv.vc_type == CONV_ICONV)
  	convert_setup(&output_conv, NULL, NULL);
  
      if (hIconvDLL != 0)
  	FreeLibrary(hIconvDLL);
      if (hMsvcrtDLL != 0)
  	FreeLibrary(hMsvcrtDLL);
      hIconvDLL = 0;
      hMsvcrtDLL = 0;
  }
  #  endif // DYNAMIC_ICONV
  # endif // USE_ICONV
  
  #if defined(FEAT_EVAL) || defined(PROTO)
  /*
   * "getimstatus()" function
   */
      void
  f_getimstatus(typval_T *argvars UNUSED, typval_T *rettv)
  {
  # if defined(HAVE_INPUT_METHOD)
      rettv->vval.v_number = im_get_status();
  # endif
  }
  
  /*
   * iconv() function
   */
      void
  f_iconv(typval_T *argvars UNUSED, typval_T *rettv)
  {
      char_u	buf1[NUMBUFLEN];
      char_u	buf2[NUMBUFLEN];
      char_u	*from, *to, *str;
      vimconv_T	vimconv;
  
      rettv->v_type = VAR_STRING;
      rettv->vval.v_string = NULL;
  
      if (in_vim9script()
  	    && (check_for_string_arg(argvars, 0) == FAIL
  		|| check_for_string_arg(argvars, 1) == FAIL
  		|| check_for_string_arg(argvars, 2) == FAIL))
  	return;
  
      str = tv_get_string(&argvars[0]);
      from = enc_canonize(enc_skip(tv_get_string_buf(&argvars[1], buf1)));
      to = enc_canonize(enc_skip(tv_get_string_buf(&argvars[2], buf2)));
      vimconv.vc_type = CONV_NONE;
      convert_setup(&vimconv, from, to);
  
      // If the encodings are equal, no conversion needed.
      if (vimconv.vc_type == CONV_NONE)
  	rettv->vval.v_string = vim_strsave(str);
      else
  	rettv->vval.v_string = string_convert(&vimconv, str, NULL);
  
      convert_setup(&vimconv, NULL, NULL);
      vim_free(from);
      vim_free(to);
  }
  #endif
  
  /*
   * Setup "vcp" for conversion from "from" to "to".
   * The names must have been made canonical with enc_canonize().
   * vcp->vc_type must have been initialized to CONV_NONE.
   * Note: cannot be used for conversion from/to ucs-2 and ucs-4 (will use utf-8
   * instead).
   * Afterwards invoke with "from" and "to" equal to NULL to cleanup.
   * Return FAIL when conversion is not supported, OK otherwise.
   */
      int
  convert_setup(vimconv_T *vcp, char_u *from, char_u *to)
  {
      return convert_setup_ext(vcp, from, TRUE, to, TRUE);
  }
  
  /*
   * As convert_setup(), but only when from_unicode_is_utf8 is TRUE will all
   * "from" unicode charsets be considered utf-8.  Same for "to".
   */
      int
  convert_setup_ext(
      vimconv_T	*vcp,
      char_u	*from,
      int		from_unicode_is_utf8,
      char_u	*to,
      int		to_unicode_is_utf8)
  {
      int		from_prop;
      int		to_prop;
      int		from_is_utf8;
      int		to_is_utf8;
  
      // Reset to no conversion.
  #ifdef USE_ICONV
      if (vcp->vc_type == CONV_ICONV && vcp->vc_fd != (iconv_t)-1)
  	iconv_close(vcp->vc_fd);
  #endif
      vcp->vc_type = CONV_NONE;
      vcp->vc_factor = 1;
      vcp->vc_fail = FALSE;
  
      // No conversion when one of the names is empty or they are equal.
      if (from == NULL || *from == NUL || to == NULL || *to == NUL
  						     || STRCMP(from, to) == 0)
  	return OK;
  
      from_prop = enc_canon_props(from);
      to_prop = enc_canon_props(to);
      if (from_unicode_is_utf8)
  	from_is_utf8 = from_prop & ENC_UNICODE;
      else
  	from_is_utf8 = from_prop == ENC_UNICODE;
      if (to_unicode_is_utf8)
  	to_is_utf8 = to_prop & ENC_UNICODE;
      else
  	to_is_utf8 = to_prop == ENC_UNICODE;
  
      if ((from_prop & ENC_LATIN1) && to_is_utf8)
      {
  	// Internal latin1 -> utf-8 conversion.
  	vcp->vc_type = CONV_TO_UTF8;
  	vcp->vc_factor = 2;	// up to twice as long
      }
      else if ((from_prop & ENC_LATIN9) && to_is_utf8)
      {
  	// Internal latin9 -> utf-8 conversion.
  	vcp->vc_type = CONV_9_TO_UTF8;
  	vcp->vc_factor = 3;	// up to three as long (euro sign)
      }
      else if (from_is_utf8 && (to_prop & ENC_LATIN1))
      {
  	// Internal utf-8 -> latin1 conversion.
  	vcp->vc_type = CONV_TO_LATIN1;
      }
      else if (from_is_utf8 && (to_prop & ENC_LATIN9))
      {
  	// Internal utf-8 -> latin9 conversion.
  	vcp->vc_type = CONV_TO_LATIN9;
      }
  #ifdef MSWIN
      // Win32-specific codepage <-> codepage conversion without iconv.
      else if ((from_is_utf8 || encname2codepage(from) > 0)
  	    && (to_is_utf8 || encname2codepage(to) > 0))
      {
  	vcp->vc_type = CONV_CODEPAGE;
  	vcp->vc_factor = 2;	// up to twice as long
  	vcp->vc_cpfrom = from_is_utf8 ? 0 : encname2codepage(from);
  	vcp->vc_cpto = to_is_utf8 ? 0 : encname2codepage(to);
      }
  #endif
  #ifdef MACOS_CONVERT
      else if ((from_prop & ENC_MACROMAN) && (to_prop & ENC_LATIN1))
      {
  	vcp->vc_type = CONV_MAC_LATIN1;
      }
      else if ((from_prop & ENC_MACROMAN) && to_is_utf8)
      {
  	vcp->vc_type = CONV_MAC_UTF8;
  	vcp->vc_factor = 2;	// up to twice as long
      }
      else if ((from_prop & ENC_LATIN1) && (to_prop & ENC_MACROMAN))
      {
  	vcp->vc_type = CONV_LATIN1_MAC;
      }
      else if (from_is_utf8 && (to_prop & ENC_MACROMAN))
      {
  	vcp->vc_type = CONV_UTF8_MAC;
      }
  #endif
  #ifdef USE_ICONV
      else
      {
  	// Use iconv() for conversion.
  	vcp->vc_fd = (iconv_t)my_iconv_open(
  		to_is_utf8 ? (char_u *)"utf-8" : to,
  		from_is_utf8 ? (char_u *)"utf-8" : from);
  	if (vcp->vc_fd != (iconv_t)-1)
  	{
  	    vcp->vc_type = CONV_ICONV;
  	    vcp->vc_factor = 4;	// could be longer too...
  	}
      }
  #endif
      if (vcp->vc_type == CONV_NONE)
  	return FAIL;
  
      return OK;
  }
  
  #if defined(FEAT_GUI) || defined(AMIGA) || defined(MSWIN) \
  	|| defined(PROTO)
  /*
   * Do conversion on typed input characters in-place.
   * The input and output are not NUL terminated!
   * Returns the length after conversion.
   */
      int
  convert_input(char_u *ptr, int len, int maxlen)
  {
      return convert_input_safe(ptr, len, maxlen, NULL, NULL);
  }
  #endif
  
  /*
   * Like convert_input(), but when there is an incomplete byte sequence at the
   * end return that as an allocated string in "restp" and set "*restlenp" to
   * the length.  If "restp" is NULL it is not used.
   */
      int
  convert_input_safe(
      char_u	*ptr,
      int		len,
      int		maxlen,
      char_u	**restp,
      int		*restlenp)
  {
      char_u	*d;
      int		dlen = len;
      int		unconvertlen = 0;
  
      d = string_convert_ext(&input_conv, ptr, &dlen,
  					restp == NULL ? NULL : &unconvertlen);
      if (d != NULL)
      {
  	if (dlen <= maxlen)
  	{
  	    if (unconvertlen > 0)
  	    {
  		// Move the unconverted characters to allocated memory.
  		*restp = alloc(unconvertlen);
  		if (*restp != NULL)
  		    mch_memmove(*restp, ptr + len - unconvertlen, unconvertlen);
  		*restlenp = unconvertlen;
  	    }
  	    mch_memmove(ptr, d, dlen);
  	}
  	else
  	    // result is too long, keep the unconverted text (the caller must
  	    // have done something wrong!)
  	    dlen = len;
  	vim_free(d);
      }
      return dlen;
  }
  
  /*
   * Convert text "ptr[*lenp]" according to "vcp".
   * Returns the result in allocated memory and sets "*lenp".
   * When "lenp" is NULL, use NUL terminated strings.
   * Illegal chars are often changed to "?", unless vcp->vc_fail is set.
   * When something goes wrong, NULL is returned and "*lenp" is unchanged.
   */
      char_u *
  string_convert(
      vimconv_T	*vcp,
      char_u	*ptr,
      int		*lenp)
  {
      return string_convert_ext(vcp, ptr, lenp, NULL);
  }
  
  /*
   * Like string_convert(), but when "unconvlenp" is not NULL and there are is
   * an incomplete sequence at the end it is not converted and "*unconvlenp" is
   * set to the number of remaining bytes.
   */
      char_u *
  string_convert_ext(
      vimconv_T	*vcp,
      char_u	*ptr,
      int		*lenp,
      int		*unconvlenp)
  {
      char_u	*retval = NULL;
      char_u	*d;
      int		len;
      int		i;
      int		l;
      int		c;
  
      if (lenp == NULL)
  	len = (int)STRLEN(ptr);
      else
  	len = *lenp;
      if (len == 0)
  	return vim_strsave((char_u *)"");
  
      switch (vcp->vc_type)
      {
  	case CONV_TO_UTF8:	// latin1 to utf-8 conversion
  	    retval = alloc(len * 2 + 1);
  	    if (retval == NULL)
  		break;
  	    d = retval;
  	    for (i = 0; i < len; ++i)
  	    {
  		c = ptr[i];
  		if (c < 0x80)
  		    *d++ = c;
  		else
  		{
  		    *d++ = 0xc0 + ((unsigned)c >> 6);
  		    *d++ = 0x80 + (c & 0x3f);
  		}
  	    }
  	    *d = NUL;
  	    if (lenp != NULL)
  		*lenp = (int)(d - retval);
  	    break;
  
  	case CONV_9_TO_UTF8:	// latin9 to utf-8 conversion
  	    retval = alloc(len * 3 + 1);
  	    if (retval == NULL)
  		break;
  	    d = retval;
  	    for (i = 0; i < len; ++i)
  	    {
  		c = ptr[i];
  		switch (c)
  		{
  		    case 0xa4: c = 0x20ac; break;   // euro
  		    case 0xa6: c = 0x0160; break;   // S hat
  		    case 0xa8: c = 0x0161; break;   // S -hat
  		    case 0xb4: c = 0x017d; break;   // Z hat
  		    case 0xb8: c = 0x017e; break;   // Z -hat
  		    case 0xbc: c = 0x0152; break;   // OE
  		    case 0xbd: c = 0x0153; break;   // oe
  		    case 0xbe: c = 0x0178; break;   // Y
  		}
  		d += utf_char2bytes(c, d);
  	    }
  	    *d = NUL;
  	    if (lenp != NULL)
  		*lenp = (int)(d - retval);
  	    break;
  
  	case CONV_TO_LATIN1:	// utf-8 to latin1 conversion
  	case CONV_TO_LATIN9:	// utf-8 to latin9 conversion
  	    retval = alloc(len + 1);
  	    if (retval == NULL)
  		break;
  	    d = retval;
  	    for (i = 0; i < len; ++i)
  	    {
  		l = utf_ptr2len_len(ptr + i, len - i);
  		if (l == 0)
  		    *d++ = NUL;
  		else if (l == 1)
  		{
  		    int l_w = utf8len_tab_zero[ptr[i]];
  
  		    if (l_w == 0)
  		    {
  			// Illegal utf-8 byte cannot be converted
  			vim_free(retval);
  			return NULL;
  		    }
  		    if (unconvlenp != NULL && l_w > len - i)
  		    {
  			// Incomplete sequence at the end.
  			*unconvlenp = len - i;
  			break;
  		    }
  		    *d++ = ptr[i];
  		}
  		else
  		{
  		    c = utf_ptr2char(ptr + i);
  		    if (vcp->vc_type == CONV_TO_LATIN9)
  			switch (c)
  			{
  			    case 0x20ac: c = 0xa4; break;   // euro
  			    case 0x0160: c = 0xa6; break;   // S hat
  			    case 0x0161: c = 0xa8; break;   // S -hat
  			    case 0x017d: c = 0xb4; break;   // Z hat
  			    case 0x017e: c = 0xb8; break;   // Z -hat
  			    case 0x0152: c = 0xbc; break;   // OE
  			    case 0x0153: c = 0xbd; break;   // oe
  			    case 0x0178: c = 0xbe; break;   // Y
  			    case 0xa4:
  			    case 0xa6:
  			    case 0xa8:
  			    case 0xb4:
  			    case 0xb8:
  			    case 0xbc:
  			    case 0xbd:
  			    case 0xbe: c = 0x100; break; // not in latin9
  			}
  		    if (!utf_iscomposing(c))	// skip composing chars
  		    {
  			if (c < 0x100)
  			    *d++ = c;
  			else if (vcp->vc_fail)
  			{
  			    vim_free(retval);
  			    return NULL;
  			}
  			else
  			{
  			    *d++ = 0xbf;
  			    if (utf_char2cells(c) > 1)
  				*d++ = '?';
  			}
  		    }
  		    i += l - 1;
  		}
  	    }
  	    *d = NUL;
  	    if (lenp != NULL)
  		*lenp = (int)(d - retval);
  	    break;
  
  # ifdef MACOS_CONVERT
  	case CONV_MAC_LATIN1:
  	    retval = mac_string_convert(ptr, len, lenp, vcp->vc_fail,
  					'm', 'l', unconvlenp);
  	    break;
  
  	case CONV_LATIN1_MAC:
  	    retval = mac_string_convert(ptr, len, lenp, vcp->vc_fail,
  					'l', 'm', unconvlenp);
  	    break;
  
  	case CONV_MAC_UTF8:
  	    retval = mac_string_convert(ptr, len, lenp, vcp->vc_fail,
  					'm', 'u', unconvlenp);
  	    break;
  
  	case CONV_UTF8_MAC:
  	    retval = mac_string_convert(ptr, len, lenp, vcp->vc_fail,
  					'u', 'm', unconvlenp);
  	    break;
  # endif
  
  # ifdef USE_ICONV
  	case CONV_ICONV:	// conversion with output_conv.vc_fd
  	    retval = iconv_string(vcp, ptr, len, unconvlenp, lenp);
  	    break;
  # endif
  # ifdef MSWIN
  	case CONV_CODEPAGE:		// codepage -> codepage
  	{
  	    int		retlen;
  	    int		tmp_len;
  	    short_u	*tmp;
  
  	    // 1. codepage/UTF-8  ->  ucs-2.
  	    if (vcp->vc_cpfrom == 0)
  		tmp_len = utf8_to_utf16(ptr, len, NULL, NULL);
  	    else
  	    {
  		tmp_len = MultiByteToWideChar(vcp->vc_cpfrom,
  					unconvlenp ? MB_ERR_INVALID_CHARS : 0,
  					(char *)ptr, len, 0, 0);
  		if (tmp_len == 0
  			&& GetLastError() == ERROR_NO_UNICODE_TRANSLATION)
  		{
  		    if (lenp != NULL)
  			*lenp = 0;
  		    if (unconvlenp != NULL)
  			*unconvlenp = len;
  		    retval = alloc(1);
  		    if (retval)
  			retval[0] = NUL;
  		    return retval;
  		}
  	    }
  	    tmp = ALLOC_MULT(short_u, tmp_len);
  	    if (tmp == NULL)
  		break;
  	    if (vcp->vc_cpfrom == 0)
  		utf8_to_utf16(ptr, len, tmp, unconvlenp);
  	    else
  		MultiByteToWideChar(vcp->vc_cpfrom, 0,
  			(char *)ptr, len, tmp, tmp_len);
  
  	    // 2. ucs-2  ->  codepage/UTF-8.
  	    if (vcp->vc_cpto == 0)
  		retlen = utf16_to_utf8(tmp, tmp_len, NULL);
  	    else
  		retlen = WideCharToMultiByte(vcp->vc_cpto, 0,
  						    tmp, tmp_len, 0, 0, 0, 0);
  	    retval = alloc(retlen + 1);
  	    if (retval != NULL)
  	    {
  		if (vcp->vc_cpto == 0)
  		    utf16_to_utf8(tmp, tmp_len, retval);
  		else
  		    WideCharToMultiByte(vcp->vc_cpto, 0,
  					  tmp, tmp_len,
  					  (char *)retval, retlen, 0, 0);
  		retval[retlen] = NUL;
  		if (lenp != NULL)
  		    *lenp = retlen;
  	    }
  	    vim_free(tmp);
  	    break;
  	}
  # endif
      }
  
      return retval;
  }
  
  #if defined(FEAT_EVAL) || defined(PROTO)
  
  /*
   * Table set by setcellwidths().
   */
  typedef struct
  {
      long    first;
      long    last;
      char    width;
  } cw_interval_T;
  
  static cw_interval_T	*cw_table = NULL;
  static size_t		cw_table_size = 0;
  
  /*
   * Return 1 or 2 when "c" is in the cellwidth table.
   * Return 0 if not.
   */
      static int
  cw_value(int c)
  {
      int mid, bot, top;
  
      if (cw_table == NULL)
  	return 0;
  
      // first quick check for Latin1 etc. characters
      if (c < cw_table[0].first)
  	return 0;
  
      // binary search in table
      bot = 0;
      top = (int)cw_table_size - 1;
      while (top >= bot)
      {
  	mid = (bot + top) / 2;
  	if (cw_table[mid].last < c)
  	    bot = mid + 1;
  	else if (cw_table[mid].first > c)
  	    top = mid - 1;
  	else
  	    return cw_table[mid].width;
      }
      return 0;
  }
  
      static int
  tv_nr_compare(const void *a1, const void *a2)
  {
      listitem_T *li1 = *(listitem_T **)a1;
      listitem_T *li2 = *(listitem_T **)a2;
  
      return li1->li_tv.vval.v_number - li2->li_tv.vval.v_number;
  }
  
      void
  f_setcellwidths(typval_T *argvars, typval_T *rettv UNUSED)
  {
      list_T	    *l;
      listitem_T	    *li;
      int		    item;
      int		    i;
      listitem_T	    **ptrs;
      cw_interval_T   *table;
      cw_interval_T   *cw_table_save;
      size_t	    cw_table_size_save;
  
      if (in_vim9script() && check_for_list_arg(argvars, 0) == FAIL)
  	return;
  
      if (argvars[0].v_type != VAR_LIST || argvars[0].vval.v_list == NULL)
      {
  	emsg(_(e_list_required));
  	return;
      }
      l = argvars[0].vval.v_list;
      if (l->lv_len == 0)
      {
  	// Clearing the table.
  	vim_free(cw_table);
  	cw_table = NULL;
  	cw_table_size = 0;
  	return;
      }
  
      ptrs = ALLOC_MULT(listitem_T *, l->lv_len);
      if (ptrs == NULL)
  	return;
  
      // Check that all entries are a list with three numbers, the range is
      // valid and the cell width is valid.
      item = 0;
      for (li = l->lv_first; li != NULL; li = li->li_next)
      {
  	listitem_T *lili;
  	varnumber_T n1;
  
  	if (li->li_tv.v_type != VAR_LIST || li->li_tv.vval.v_list == NULL)
  	{
  	    semsg(_(e_list_item_nr_is_not_list), item);
  	    vim_free(ptrs);
  	    return;
  	}
  
  	lili = li->li_tv.vval.v_list->lv_first;
  	ptrs[item] = lili;
  	for (i = 0; lili != NULL; lili = lili->li_next, ++i)
  	{
  	    if (lili->li_tv.v_type != VAR_NUMBER)
  		break;
  	    if (i == 0)
  	    {
  		n1 = lili->li_tv.vval.v_number;
  		if (n1 < 0x100)
  		{
  		    emsg(_(e_only_values_of_0x100_and_higher_supported));
  		    vim_free(ptrs);
  		    return;
  		}
  	    }
  	    else if (i == 1 && lili->li_tv.vval.v_number < n1)
  	    {
  		semsg(_(e_list_item_nr_range_invalid), item);
  		vim_free(ptrs);
  		return;
  	    }
  	    else if (i == 2 && (lili->li_tv.vval.v_number < 1
  					     || lili->li_tv.vval.v_number > 2))
  	    {
  		semsg(_(e_list_item_nr_cell_width_invalid), item);
  		vim_free(ptrs);
  		return;
  	    }
  	}
  	if (i != 3)
  	{
  	    semsg(_(e_list_item_nr_does_not_contain_3_numbers), item);
  	    vim_free(ptrs);
  	    return;
  	}
  	++item;
      }
  
      // Sort the list on the first number.
      qsort((void *)ptrs, (size_t)l->lv_len, sizeof(listitem_T *), tv_nr_compare);
  
      table = ALLOC_MULT(cw_interval_T, l->lv_len);
      if (table == NULL)
      {
  	vim_free(ptrs);
  	return;
      }
  
      // Store the items in the new table.
      item = 0;
      for (item = 0; item < l->lv_len; ++item)
      {
  	listitem_T	*lili = ptrs[item];
  	varnumber_T	n1;
  
  	n1 = lili->li_tv.vval.v_number;
  	if (item > 0 && n1 <= table[item - 1].last)
  	{
  	    semsg(_(e_overlapping_ranges_for_nr), (long)n1);
  	    vim_free(ptrs);
  	    vim_free(table);
  	    return;
  	}
  	table[item].first = n1;
  	lili = lili->li_next;
  	table[item].last = lili->li_tv.vval.v_number;
  	lili = lili->li_next;
  	table[item].width = lili->li_tv.vval.v_number;
      }
  
      vim_free(ptrs);
  
      cw_table_save = cw_table;
      cw_table_size_save = cw_table_size;
      cw_table = table;
      cw_table_size = l->lv_len;
  
      // Check that the new value does not conflict with 'fillchars' or
      // 'listchars'.
      if (set_chars_option(curwin, &p_fcs) != NULL)
      {
  	emsg(_(e_conflicts_with_value_of_fillchars));
  	cw_table = cw_table_save;
  	cw_table_size = cw_table_size_save;
  	vim_free(table);
  	return;
      }
      else
      {
  	tabpage_T	*tp;
  	win_T	*wp;
  
  	FOR_ALL_TAB_WINDOWS(tp, wp)
  	{
  	    if (set_chars_option(wp, &wp->w_p_lcs) != NULL)
  	    {
  		emsg((e_conflicts_with_value_of_listchars));
  		cw_table = cw_table_save;
  		cw_table_size = cw_table_size_save;
  		vim_free(table);
  		return;
  	    }
  	}
      }
  
      vim_free(cw_table_save);
  }
  
      void
  f_charclass(typval_T *argvars, typval_T *rettv UNUSED)
  {
      if (check_for_string_arg(argvars, 0) == FAIL
  	    || argvars[0].vval.v_string == NULL)
  	return;
      rettv->vval.v_number = mb_get_class(argvars[0].vval.v_string);
  }
  #endif
  