src/libsystemd-terminal/term-wcwidth.c - systemd-stable - Rivoreo Source Code Repositories

 /*
  * (Minimal changes made by David Herrmann, to make clean for inclusion in
  *  systemd. Original header follows.)
  *
  * This is an implementation of wcwidth() and wcswidth() (defined in
  * IEEE Std 1002.1-2001) for Unicode.
  *
  * http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html
  * http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html
  *
  * In fixed-width output devices, Latin characters all occupy a single
  * "cell" position of equal width, whereas ideographic CJK characters
  * occupy two such cells. Interoperability between terminal-line
  * applications and (teletype-style) character terminals using the
  * UTF-8 encoding requires agreement on which character should advance
  * the cursor by how many cell positions. No established formal
  * standards exist at present on which Unicode character shall occupy
  * how many cell positions on character terminals. These routines are
  * a first attempt of defining such behavior based on simple rules
  * applied to data provided by the Unicode Consortium.
  *
  * For some graphical characters, the Unicode standard explicitly
  * defines a character-cell width via the definition of the East Asian
  * FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes.
  * In all these cases, there is no ambiguity about which width a
  * terminal shall use. For characters in the East Asian Ambiguous (A)
  * class, the width choice depends purely on a preference of backward
  * compatibility with either historic CJK or Western practice.
  * Choosing single-width for these characters is easy to justify as
  * the appropriate long-term solution, as the CJK practice of
  * displaying these characters as double-width comes from historic
  * implementation simplicity (8-bit encoded characters were displayed
  * single-width and 16-bit ones double-width, even for Greek,
  * Cyrillic, etc.) and not any typographic considerations.
  *
  * Much less clear is the choice of width for the Not East Asian
  * (Neutral) class. Existing practice does not dictate a width for any
  * of these characters. It would nevertheless make sense
  * typographically to allocate two character cells to characters such
  * as for instance EM SPACE or VOLUME INTEGRAL, which cannot be
  * represented adequately with a single-width glyph. The following
  * routines at present merely assign a single-cell width to all
  * neutral characters, in the interest of simplicity. This is not
  * entirely satisfactory and should be reconsidered before
  * establishing a formal standard in this area. At the moment, the
  * decision which Not East Asian (Neutral) characters should be
  * represented by double-width glyphs cannot yet be answered by
  * applying a simple rule from the Unicode database content. Setting
  * up a proper standard for the behavior of UTF-8 character terminals
  * will require a careful analysis not only of each Unicode character,
  * but also of each presentation form, something the author of these
  * routines has avoided to do so far.
  *
  * http://www.unicode.org/unicode/reports/tr11/
  *
  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
  *
  * Permission to use, copy, modify, and distribute this software
  * for any purpose and without fee is hereby granted. The author
  * disclaims all warranties with regard to this software.
  *
  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
  */

 #include "term-internal.h"

 struct interval {
   wchar_t first;
   wchar_t last;
 };

 /* auxiliary function for binary search in interval table */
 static int bisearch(wchar_t ucs, const struct interval *table, int max) {
   int min = 0;
   int mid;

   if (ucs < table[0].first || ucs > table[max].last)
     return 0;
   while (max >= min) {
     mid = (min + max) / 2;
     if (ucs > table[mid].last)
       min = mid + 1;
     else if (ucs < table[mid].first)
       max = mid - 1;
     else
       return 1;
   }

   return 0;
 }


 /* The following two functions define the column width of an ISO 10646
  * character as follows:
  *
  *    - The null character (U+0000) has a column width of 0.
  *
  *    - Other C0/C1 control characters and DEL will lead to a return
  *      value of -1.
  *
  *    - Non-spacing and enclosing combining characters (general
  *      category code Mn or Me in the Unicode database) have a
  *      column width of 0.
  *
  *    - SOFT HYPHEN (U+00AD) has a column width of 1.
  *
  *    - Other format characters (general category code Cf in the Unicode
  *      database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
  *
  *    - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
  *      have a column width of 0.
  *
  *    - Spacing characters in the East Asian Wide (W) or East Asian
  *      Full-width (F) category as defined in Unicode Technical
  *      Report #11 have a column width of 2.
  *
  *    - All remaining characters (including all printable
  *      ISO 8859-1 and WGL4 characters, Unicode control characters,
  *      etc.) have a column width of 1.
  *
  * This implementation assumes that wchar_t characters are encoded
  * in ISO 10646.
  */

 int mk_wcwidth(wchar_t ucs)
 {
   /* sorted list of non-overlapping intervals of non-spacing characters */
   /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
   static const struct interval combining[] = {
     { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
     { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
     { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
     { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
     { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
     { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
     { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
     { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
     { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
     { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
     { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
     { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
     { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
     { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
     { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
     { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
     { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
     { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
     { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
     { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
     { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
     { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
     { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
     { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
     { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
     { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
     { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
     { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
     { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
     { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
     { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
     { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
     { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
     { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
     { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
     { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
     { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
     { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
     { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
     { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
     { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
     { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
     { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
     { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
     { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
     { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
     { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
     { 0xE0100, 0xE01EF }
   };

   /* test for 8-bit control characters */
   if (ucs == 0)
     return 0;
   if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
     return -1;

   /* binary search in table of non-spacing characters */
   if (bisearch(ucs, combining,
                sizeof(combining) / sizeof(struct interval) - 1))
     return 0;

   /* if we arrive here, ucs is not a combining or C0/C1 control character */

   return 1 +
     (ucs >= 0x1100 &&
      (ucs <= 0x115f ||                    /* Hangul Jamo init. consonants */
       ucs == 0x2329 || ucs == 0x232a ||
       (ucs >= 0x2e80 && ucs <= 0xa4cf &&
        ucs != 0x303f) ||                  /* CJK ... Yi */
       (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
       (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
       (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
       (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
       (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
       (ucs >= 0xffe0 && ucs <= 0xffe6) ||
       (ucs >= 0x20000 && ucs <= 0x2fffd) ||
       (ucs >= 0x30000 && ucs <= 0x3fffd)));
 }


 int mk_wcswidth(const wchar_t *pwcs, size_t n)
 {
   int w, width = 0;

   for (;*pwcs && n-- > 0; pwcs++)
     if ((w = mk_wcwidth(*pwcs)) < 0)
       return -1;
     else
       width += w;

   return width;
 }


 /*
  * The following functions are the same as mk_wcwidth() and
  * mk_wcswidth(), except that spacing characters in the East Asian
  * Ambiguous (A) category as defined in Unicode Technical Report #11
  * have a column width of 2. This variant might be useful for users of
  * CJK legacy encodings who want to migrate to UCS without changing
  * the traditional terminal character-width behaviour. It is not
  * otherwise recommended for general use.
  */
 int mk_wcwidth_cjk(wchar_t ucs)
 {
   /* sorted list of non-overlapping intervals of East Asian Ambiguous
    * characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c" */
   static const struct interval ambiguous[] = {
     { 0x00A1, 0x00A1 }, { 0x00A4, 0x00A4 }, { 0x00A7, 0x00A8 },
     { 0x00AA, 0x00AA }, { 0x00AE, 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 }, { 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 },
     { 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 }, { 0x2614, 0x2615 },
     { 0x261C, 0x261C }, { 0x261E, 0x261E }, { 0x2640, 0x2640 },
     { 0x2642, 0x2642 }, { 0x2660, 0x2661 }, { 0x2663, 0x2665 },
     { 0x2667, 0x266A }, { 0x266C, 0x266D }, { 0x266F, 0x266F },
     { 0x273D, 0x273D }, { 0x2776, 0x277F }, { 0xE000, 0xF8FF },
     { 0xFFFD, 0xFFFD }, { 0xF0000, 0xFFFFD }, { 0x100000, 0x10FFFD }
   };

   /* binary search in table of non-spacing characters */
   if (bisearch(ucs, ambiguous,
                sizeof(ambiguous) / sizeof(struct interval) - 1))
     return 2;

   return mk_wcwidth(ucs);
 }


 int mk_wcswidth_cjk(const wchar_t *pwcs, size_t n)
 {
   int w, width = 0;

   for (;*pwcs && n-- > 0; pwcs++)
     if ((w = mk_wcwidth_cjk(*pwcs)) < 0)
       return -1;
     else
       width += w;

   return width;
 }
	/*
	* (Minimal changes made by David Herrmann, to make clean for inclusion in
	* systemd. Original header follows.)
	*
	* This is an implementation of wcwidth() and wcswidth() (defined in
	* IEEE Std 1002.1-2001) for Unicode.
	*
	* http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html
	* http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html
	*
	* In fixed-width output devices, Latin characters all occupy a single
	* "cell" position of equal width, whereas ideographic CJK characters
	* occupy two such cells. Interoperability between terminal-line
	* applications and (teletype-style) character terminals using the
	* UTF-8 encoding requires agreement on which character should advance
	* the cursor by how many cell positions. No established formal
	* standards exist at present on which Unicode character shall occupy
	* how many cell positions on character terminals. These routines are
	* a first attempt of defining such behavior based on simple rules
	* applied to data provided by the Unicode Consortium.
	*
	* For some graphical characters, the Unicode standard explicitly
	* defines a character-cell width via the definition of the East Asian
	* FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes.
	* In all these cases, there is no ambiguity about which width a
	* terminal shall use. For characters in the East Asian Ambiguous (A)
	* class, the width choice depends purely on a preference of backward
	* compatibility with either historic CJK or Western practice.
	* Choosing single-width for these characters is easy to justify as
	* the appropriate long-term solution, as the CJK practice of
	* displaying these characters as double-width comes from historic
	* implementation simplicity (8-bit encoded characters were displayed
	* single-width and 16-bit ones double-width, even for Greek,
	* Cyrillic, etc.) and not any typographic considerations.
	*
	* Much less clear is the choice of width for the Not East Asian
	* (Neutral) class. Existing practice does not dictate a width for any
	* of these characters. It would nevertheless make sense
	* typographically to allocate two character cells to characters such
	* as for instance EM SPACE or VOLUME INTEGRAL, which cannot be
	* represented adequately with a single-width glyph. The following
	* routines at present merely assign a single-cell width to all
	* neutral characters, in the interest of simplicity. This is not
	* entirely satisfactory and should be reconsidered before
	* establishing a formal standard in this area. At the moment, the
	* decision which Not East Asian (Neutral) characters should be
	* represented by double-width glyphs cannot yet be answered by
	* applying a simple rule from the Unicode database content. Setting
	* up a proper standard for the behavior of UTF-8 character terminals
	* will require a careful analysis not only of each Unicode character,
	* but also of each presentation form, something the author of these
	* routines has avoided to do so far.
	*
	* http://www.unicode.org/unicode/reports/tr11/
	*
	* Markus Kuhn -- 2007-05-26 (Unicode 5.0)
	*
	* Permission to use, copy, modify, and distribute this software
	* for any purpose and without fee is hereby granted. The author
	* disclaims all warranties with regard to this software.
	*
	* Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
	*/

	#include "term-internal.h"

	struct interval {
	wchar_t first;
	wchar_t last;
	};

	/* auxiliary function for binary search in interval table */
	static int bisearch(wchar_t ucs, const struct interval *table, int max) {
	int min = 0;
	int mid;

	if (ucs < table[0].first \|\| ucs > table[max].last)
	return 0;
	while (max >= min) {
	mid = (min + max) / 2;
	if (ucs > table[mid].last)
	min = mid + 1;
	else if (ucs < table[mid].first)
	max = mid - 1;
	else
	return 1;
	}

	return 0;
	}


	/* The following two functions define the column width of an ISO 10646
	* character as follows:
	*
	* - The null character (U+0000) has a column width of 0.
	*
	* - Other C0/C1 control characters and DEL will lead to a return
	* value of -1.
	*
	* - Non-spacing and enclosing combining characters (general
	* category code Mn or Me in the Unicode database) have a
	* column width of 0.
	*
	* - SOFT HYPHEN (U+00AD) has a column width of 1.
	*
	* - Other format characters (general category code Cf in the Unicode
	* database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
	*
	* - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
	* have a column width of 0.
	*
	* - Spacing characters in the East Asian Wide (W) or East Asian
	* Full-width (F) category as defined in Unicode Technical
	* Report #11 have a column width of 2.
	*
	* - All remaining characters (including all printable
	* ISO 8859-1 and WGL4 characters, Unicode control characters,
	* etc.) have a column width of 1.
	*
	* This implementation assumes that wchar_t characters are encoded
	* in ISO 10646.
	*/

	int mk_wcwidth(wchar_t ucs)
	{
	/* sorted list of non-overlapping intervals of non-spacing characters */
	/* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
	static const struct interval combining[] = {
	{ 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
	{ 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
	{ 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
	{ 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
	{ 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
	{ 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
	{ 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
	{ 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
	{ 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
	{ 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
	{ 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
	{ 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
	{ 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
	{ 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
	{ 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
	{ 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
	{ 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
	{ 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
	{ 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
	{ 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
	{ 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
	{ 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
	{ 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
	{ 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
	{ 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
	{ 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
	{ 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
	{ 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
	{ 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
	{ 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
	{ 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
	{ 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
	{ 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
	{ 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
	{ 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
	{ 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
	{ 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
	{ 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
	{ 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
	{ 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
	{ 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
	{ 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
	{ 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
	{ 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
	{ 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
	{ 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
	{ 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
	{ 0xE0100, 0xE01EF }
	};

	/* test for 8-bit control characters */
	if (ucs == 0)
	return 0;
	if (ucs < 32 \|\| (ucs >= 0x7f && ucs < 0xa0))
	return -1;

	/* binary search in table of non-spacing characters */
	if (bisearch(ucs, combining,
	sizeof(combining) / sizeof(struct interval) - 1))
	return 0;

	/* if we arrive here, ucs is not a combining or C0/C1 control character */

	return 1 +
	(ucs >= 0x1100 &&
	(ucs <= 0x115f \|\| /* Hangul Jamo init. consonants */
	ucs == 0x2329 \|\| ucs == 0x232a \|\|
	(ucs >= 0x2e80 && ucs <= 0xa4cf &&
	ucs != 0x303f) \|\| /* CJK ... Yi */
	(ucs >= 0xac00 && ucs <= 0xd7a3) \|\| /* Hangul Syllables */
	(ucs >= 0xf900 && ucs <= 0xfaff) \|\| /* CJK Compatibility Ideographs */
	(ucs >= 0xfe10 && ucs <= 0xfe19) \|\| /* Vertical forms */
	(ucs >= 0xfe30 && ucs <= 0xfe6f) \|\| /* CJK Compatibility Forms */
	(ucs >= 0xff00 && ucs <= 0xff60) \|\| /* Fullwidth Forms */
	(ucs >= 0xffe0 && ucs <= 0xffe6) \|\|
	(ucs >= 0x20000 && ucs <= 0x2fffd) \|\|
	(ucs >= 0x30000 && ucs <= 0x3fffd)));
	}


	int mk_wcswidth(const wchar_t *pwcs, size_t n)
	{
	int w, width = 0;

	for (;*pwcs && n-- > 0; pwcs++)
	if ((w = mk_wcwidth(*pwcs)) < 0)
	return -1;
	else
	width += w;

	return width;
	}


	/*
	* The following functions are the same as mk_wcwidth() and
	* mk_wcswidth(), except that spacing characters in the East Asian
	* Ambiguous (A) category as defined in Unicode Technical Report #11
	* have a column width of 2. This variant might be useful for users of
	* CJK legacy encodings who want to migrate to UCS without changing
	* the traditional terminal character-width behaviour. It is not
	* otherwise recommended for general use.
	*/
	int mk_wcwidth_cjk(wchar_t ucs)
	{
	/* sorted list of non-overlapping intervals of East Asian Ambiguous
	* characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c" */
	static const struct interval ambiguous[] = {
	{ 0x00A1, 0x00A1 }, { 0x00A4, 0x00A4 }, { 0x00A7, 0x00A8 },
	{ 0x00AA, 0x00AA }, { 0x00AE, 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 }, { 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 },
	{ 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 }, { 0x2614, 0x2615 },
	{ 0x261C, 0x261C }, { 0x261E, 0x261E }, { 0x2640, 0x2640 },
	{ 0x2642, 0x2642 }, { 0x2660, 0x2661 }, { 0x2663, 0x2665 },
	{ 0x2667, 0x266A }, { 0x266C, 0x266D }, { 0x266F, 0x266F },
	{ 0x273D, 0x273D }, { 0x2776, 0x277F }, { 0xE000, 0xF8FF },
	{ 0xFFFD, 0xFFFD }, { 0xF0000, 0xFFFFD }, { 0x100000, 0x10FFFD }
	};

	/* binary search in table of non-spacing characters */
	if (bisearch(ucs, ambiguous,
	sizeof(ambiguous) / sizeof(struct interval) - 1))
	return 2;

	return mk_wcwidth(ucs);
	}


	int mk_wcswidth_cjk(const wchar_t *pwcs, size_t n)
	{
	int w, width = 0;

	for (;*pwcs && n-- > 0; pwcs++)
	if ((w = mk_wcwidth_cjk(*pwcs)) < 0)
	return -1;
	else
	width += w;

	return width;
	}