| 1 |
24 |
jeremybenn |
/*
|
| 2 |
|
|
* This is an implementation of wcwidth() and wcswidth() as defined in
|
| 3 |
|
|
* "The Single UNIX Specification, Version 2, The Open Group, 1997"
|
| 4 |
|
|
* <http://www.UNIX-systems.org/online.html>
|
| 5 |
|
|
*
|
| 6 |
|
|
* Markus Kuhn -- 2001-09-08 -- public domain
|
| 7 |
|
|
*/
|
| 8 |
|
|
|
| 9 |
|
|
#include <wchar.h>
|
| 10 |
|
|
|
| 11 |
|
|
struct interval {
|
| 12 |
|
|
unsigned short first;
|
| 13 |
|
|
unsigned short last;
|
| 14 |
|
|
};
|
| 15 |
|
|
|
| 16 |
|
|
/* auxiliary function for binary search in interval table */
|
| 17 |
|
|
static int bisearch(wchar_t ucs, const struct interval *table, int max) {
|
| 18 |
|
|
int min = 0;
|
| 19 |
|
|
int mid;
|
| 20 |
|
|
|
| 21 |
|
|
if (ucs < table[0].first || ucs > table[max].last)
|
| 22 |
|
|
return 0;
|
| 23 |
|
|
while (max >= min) {
|
| 24 |
|
|
mid = (min + max) / 2;
|
| 25 |
|
|
if (ucs > table[mid].last)
|
| 26 |
|
|
min = mid + 1;
|
| 27 |
|
|
else if (ucs < table[mid].first)
|
| 28 |
|
|
max = mid - 1;
|
| 29 |
|
|
else
|
| 30 |
|
|
return 1;
|
| 31 |
|
|
}
|
| 32 |
|
|
|
| 33 |
|
|
return 0;
|
| 34 |
|
|
}
|
| 35 |
|
|
|
| 36 |
|
|
|
| 37 |
|
|
/* The following functions define the column width of an ISO 10646
|
| 38 |
|
|
* character as follows:
|
| 39 |
|
|
*
|
| 40 |
|
|
* - The null character (U+0000) has a column width of 0.
|
| 41 |
|
|
*
|
| 42 |
|
|
* - Other C0/C1 control characters and DEL will lead to a return
|
| 43 |
|
|
* value of -1.
|
| 44 |
|
|
*
|
| 45 |
|
|
* - Non-spacing and enclosing combining characters (general
|
| 46 |
|
|
* category code Mn or Me in the Unicode database) have a
|
| 47 |
|
|
* column width of 0.
|
| 48 |
|
|
*
|
| 49 |
|
|
* - Other format characters (general category code Cf in the Unicode
|
| 50 |
|
|
* database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
|
| 51 |
|
|
*
|
| 52 |
|
|
* - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
|
| 53 |
|
|
* have a column width of 0.
|
| 54 |
|
|
*
|
| 55 |
|
|
* - Spacing characters in the East Asian Wide (W) or East Asian
|
| 56 |
|
|
* FullWidth (F) category as defined in Unicode Technical
|
| 57 |
|
|
* Report #11 have a column width of 2.
|
| 58 |
|
|
*
|
| 59 |
|
|
* - All remaining characters (including all printable
|
| 60 |
|
|
* ISO 8859-1 and WGL4 characters, Unicode control characters,
|
| 61 |
|
|
* etc.) have a column width of 1.
|
| 62 |
|
|
*
|
| 63 |
|
|
* This implementation assumes that wchar_t characters are encoded
|
| 64 |
|
|
* in ISO 10646.
|
| 65 |
|
|
*/
|
| 66 |
|
|
|
| 67 |
|
|
int wcwidth(wchar_t ucs)
|
| 68 |
|
|
{
|
| 69 |
|
|
/* sorted list of non-overlapping intervals of non-spacing characters */
|
| 70 |
|
|
static const struct interval combining[] = {
|
| 71 |
|
|
{ 0x0300, 0x034E }, { 0x0360, 0x0362 }, { 0x0483, 0x0486 },
|
| 72 |
|
|
{ 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 },
|
| 73 |
|
|
{ 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
|
| 74 |
|
|
{ 0x05C4, 0x05C4 }, { 0x064B, 0x0655 }, { 0x0670, 0x0670 },
|
| 75 |
|
|
{ 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
|
| 76 |
|
|
{ 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
|
| 77 |
|
|
{ 0x07A6, 0x07B0 }, { 0x0901, 0x0902 }, { 0x093C, 0x093C },
|
| 78 |
|
|
{ 0x0941, 0x0948 }, { 0x094D, 0x094D }, { 0x0951, 0x0954 },
|
| 79 |
|
|
{ 0x0962, 0x0963 }, { 0x0981, 0x0981 }, { 0x09BC, 0x09BC },
|
| 80 |
|
|
{ 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 },
|
| 81 |
|
|
{ 0x0A02, 0x0A02 }, { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 },
|
| 82 |
|
|
{ 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 },
|
| 83 |
|
|
{ 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 },
|
| 84 |
|
|
{ 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD }, { 0x0B01, 0x0B01 },
|
| 85 |
|
|
{ 0x0B3C, 0x0B3C }, { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 },
|
| 86 |
|
|
{ 0x0B4D, 0x0B4D }, { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 },
|
| 87 |
|
|
{ 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 },
|
| 88 |
|
|
{ 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 },
|
| 89 |
|
|
{ 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
|
| 90 |
|
|
{ 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D }, { 0x0DCA, 0x0DCA },
|
| 91 |
|
|
{ 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 }, { 0x0E31, 0x0E31 },
|
| 92 |
|
|
{ 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E }, { 0x0EB1, 0x0EB1 },
|
| 93 |
|
|
{ 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC }, { 0x0EC8, 0x0ECD },
|
| 94 |
|
|
{ 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 }, { 0x0F37, 0x0F37 },
|
| 95 |
|
|
{ 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E }, { 0x0F80, 0x0F84 },
|
| 96 |
|
|
{ 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 }, { 0x0F99, 0x0FBC },
|
| 97 |
|
|
{ 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 }, { 0x1032, 0x1032 },
|
| 98 |
|
|
{ 0x1036, 0x1037 }, { 0x1039, 0x1039 }, { 0x1058, 0x1059 },
|
| 99 |
|
|
{ 0x1160, 0x11FF }, { 0x17B7, 0x17BD }, { 0x17C6, 0x17C6 },
|
| 100 |
|
|
{ 0x17C9, 0x17D3 }, { 0x180B, 0x180E }, { 0x18A9, 0x18A9 },
|
| 101 |
|
|
{ 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x206A, 0x206F },
|
| 102 |
|
|
{ 0x20D0, 0x20E3 }, { 0x302A, 0x302F }, { 0x3099, 0x309A },
|
| 103 |
|
|
{ 0xFB1E, 0xFB1E }, { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF },
|
| 104 |
|
|
{ 0xFFF9, 0xFFFB }
|
| 105 |
|
|
};
|
| 106 |
|
|
|
| 107 |
|
|
/* test for 8-bit control characters */
|
| 108 |
|
|
if (ucs == 0)
|
| 109 |
|
|
return 0;
|
| 110 |
|
|
if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
|
| 111 |
|
|
return -1;
|
| 112 |
|
|
|
| 113 |
|
|
/* binary search in table of non-spacing characters */
|
| 114 |
|
|
if (bisearch(ucs, combining,
|
| 115 |
|
|
sizeof(combining) / sizeof(struct interval) - 1))
|
| 116 |
|
|
return 0;
|
| 117 |
|
|
|
| 118 |
|
|
/* if we arrive here, ucs is not a combining or C0/C1 control character */
|
| 119 |
|
|
|
| 120 |
|
|
return 1 +
|
| 121 |
|
|
(ucs >= 0x1100 &&
|
| 122 |
|
|
(ucs <= 0x115f || /* Hangul Jamo init. consonants */
|
| 123 |
|
|
(ucs >= 0x2e80 && ucs <= 0xa4cf && (ucs & ~0x0011) != 0x300a &&
|
| 124 |
|
|
ucs != 0x303f) || /* CJK ... Yi */
|
| 125 |
|
|
(ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
|
| 126 |
|
|
(ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
|
| 127 |
|
|
(ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
|
| 128 |
|
|
(ucs >= 0xff00 && ucs <= 0xff5f) || /* Fullwidth Forms */
|
| 129 |
|
|
(ucs >= 0xffe0 && ucs <= 0xffe6) ||
|
| 130 |
|
|
(ucs >= 0x20000 && ucs <= 0x2ffff)));
|
| 131 |
|
|
}
|
| 132 |
|
|
|
| 133 |
|
|
|
| 134 |
|
|
int wcswidth(const wchar_t *pwcs, size_t n)
|
| 135 |
|
|
{
|
| 136 |
|
|
int w, width = 0;
|
| 137 |
|
|
|
| 138 |
|
|
for (;*pwcs && n-- > 0; pwcs++)
|
| 139 |
|
|
if ((w = wcwidth(*pwcs)) < 0)
|
| 140 |
|
|
return -1;
|
| 141 |
|
|
else
|
| 142 |
|
|
width += w;
|
| 143 |
|
|
|
| 144 |
|
|
return width;
|
| 145 |
|
|
}
|
| 146 |
|
|
|
| 147 |
|
|
|
| 148 |
|
|
/*
|
| 149 |
|
|
* The following function is the same as wcwidth(), except that
|
| 150 |
|
|
* spacing characters in the East Asian Ambiguous (A) category as
|
| 151 |
|
|
* defined in Unicode Technical Report #11 have a column width of 2.
|
| 152 |
|
|
* This experimental variant might be useful for users of CJK legacy
|
| 153 |
|
|
* encodings who want to migrate to UCS. It is not otherwise
|
| 154 |
|
|
* recommended for general use.
|
| 155 |
|
|
*/
|
| 156 |
|
|
static int wcwidth_cjk(wchar_t ucs)
|
| 157 |
|
|
{
|
| 158 |
|
|
/* sorted list of non-overlapping intervals of East Asian Ambiguous
|
| 159 |
|
|
* characters */
|
| 160 |
|
|
static const struct interval ambiguous[] = {
|
| 161 |
|
|
{ 0x00A1, 0x00A1 }, { 0x00A4, 0x00A4 }, { 0x00A7, 0x00A8 },
|
| 162 |
|
|
{ 0x00AA, 0x00AA }, { 0x00AD, 0x00AE }, { 0x00B0, 0x00B4 },
|
| 163 |
|
|
{ 0x00B6, 0x00BA }, { 0x00BC, 0x00BF }, { 0x00C6, 0x00C6 },
|
| 164 |
|
|
{ 0x00D0, 0x00D0 }, { 0x00D7, 0x00D8 }, { 0x00DE, 0x00E1 },
|
| 165 |
|
|
{ 0x00E6, 0x00E6 }, { 0x00E8, 0x00EA }, { 0x00EC, 0x00ED },
|
| 166 |
|
|
{ 0x00F0, 0x00F0 }, { 0x00F2, 0x00F3 }, { 0x00F7, 0x00FA },
|
| 167 |
|
|
{ 0x00FC, 0x00FC }, { 0x00FE, 0x00FE }, { 0x0101, 0x0101 },
|
| 168 |
|
|
{ 0x0111, 0x0111 }, { 0x0113, 0x0113 }, { 0x011B, 0x011B },
|
| 169 |
|
|
{ 0x0126, 0x0127 }, { 0x012B, 0x012B }, { 0x0131, 0x0133 },
|
| 170 |
|
|
{ 0x0138, 0x0138 }, { 0x013F, 0x0142 }, { 0x0144, 0x0144 },
|
| 171 |
|
|
{ 0x0148, 0x014B }, { 0x014D, 0x014D }, { 0x0152, 0x0153 },
|
| 172 |
|
|
{ 0x0166, 0x0167 }, { 0x016B, 0x016B }, { 0x01CE, 0x01CE },
|
| 173 |
|
|
{ 0x01D0, 0x01D0 }, { 0x01D2, 0x01D2 }, { 0x01D4, 0x01D4 },
|
| 174 |
|
|
{ 0x01D6, 0x01D6 }, { 0x01D8, 0x01D8 }, { 0x01DA, 0x01DA },
|
| 175 |
|
|
{ 0x01DC, 0x01DC }, { 0x0251, 0x0251 }, { 0x0261, 0x0261 },
|
| 176 |
|
|
{ 0x02C4, 0x02C4 }, { 0x02C7, 0x02C7 }, { 0x02C9, 0x02CB },
|
| 177 |
|
|
{ 0x02CD, 0x02CD }, { 0x02D0, 0x02D0 }, { 0x02D8, 0x02DB },
|
| 178 |
|
|
{ 0x02DD, 0x02DD }, { 0x02DF, 0x02DF }, { 0x0300, 0x034E },
|
| 179 |
|
|
{ 0x0360, 0x0362 }, { 0x0391, 0x03A1 }, { 0x03A3, 0x03A9 },
|
| 180 |
|
|
{ 0x03B1, 0x03C1 }, { 0x03C3, 0x03C9 }, { 0x0401, 0x0401 },
|
| 181 |
|
|
{ 0x0410, 0x044F }, { 0x0451, 0x0451 }, { 0x2010, 0x2010 },
|
| 182 |
|
|
{ 0x2013, 0x2016 }, { 0x2018, 0x2019 }, { 0x201C, 0x201D },
|
| 183 |
|
|
{ 0x2020, 0x2022 }, { 0x2024, 0x2027 }, { 0x2030, 0x2030 },
|
| 184 |
|
|
{ 0x2032, 0x2033 }, { 0x2035, 0x2035 }, { 0x203B, 0x203B },
|
| 185 |
|
|
{ 0x203E, 0x203E }, { 0x2074, 0x2074 }, { 0x207F, 0x207F },
|
| 186 |
|
|
{ 0x2081, 0x2084 }, { 0x20AC, 0x20AC }, { 0x2103, 0x2103 },
|
| 187 |
|
|
{ 0x2105, 0x2105 }, { 0x2109, 0x2109 }, { 0x2113, 0x2113 },
|
| 188 |
|
|
{ 0x2116, 0x2116 }, { 0x2121, 0x2122 }, { 0x2126, 0x2126 },
|
| 189 |
|
|
{ 0x212B, 0x212B }, { 0x2153, 0x2155 }, { 0x215B, 0x215E },
|
| 190 |
|
|
{ 0x2160, 0x216B }, { 0x2170, 0x2179 }, { 0x2190, 0x2199 },
|
| 191 |
|
|
{ 0x21B8, 0x21B9 }, { 0x21D2, 0x21D2 }, { 0x21D4, 0x21D4 },
|
| 192 |
|
|
{ 0x21E7, 0x21E7 }, { 0x2200, 0x2200 }, { 0x2202, 0x2203 },
|
| 193 |
|
|
{ 0x2207, 0x2208 }, { 0x220B, 0x220B }, { 0x220F, 0x220F },
|
| 194 |
|
|
{ 0x2211, 0x2211 }, { 0x2215, 0x2215 }, { 0x221A, 0x221A },
|
| 195 |
|
|
{ 0x221D, 0x2220 }, { 0x2223, 0x2223 }, { 0x2225, 0x2225 },
|
| 196 |
|
|
{ 0x2227, 0x222C }, { 0x222E, 0x222E }, { 0x2234, 0x2237 },
|
| 197 |
|
|
{ 0x223C, 0x223D }, { 0x2248, 0x2248 }, { 0x224C, 0x224C },
|
| 198 |
|
|
{ 0x2252, 0x2252 }, { 0x2260, 0x2261 }, { 0x2264, 0x2267 },
|
| 199 |
|
|
{ 0x226A, 0x226B }, { 0x226E, 0x226F }, { 0x2282, 0x2283 },
|
| 200 |
|
|
{ 0x2286, 0x2287 }, { 0x2295, 0x2295 }, { 0x2299, 0x2299 },
|
| 201 |
|
|
{ 0x22A5, 0x22A5 }, { 0x22BF, 0x22BF }, { 0x2312, 0x2312 },
|
| 202 |
|
|
{ 0x2329, 0x232A }, { 0x2460, 0x24BF }, { 0x24D0, 0x24E9 },
|
| 203 |
|
|
{ 0x2500, 0x254B }, { 0x2550, 0x2574 }, { 0x2580, 0x258F },
|
| 204 |
|
|
{ 0x2592, 0x2595 }, { 0x25A0, 0x25A1 }, { 0x25A3, 0x25A9 },
|
| 205 |
|
|
{ 0x25B2, 0x25B3 }, { 0x25B6, 0x25B7 }, { 0x25BC, 0x25BD },
|
| 206 |
|
|
{ 0x25C0, 0x25C1 }, { 0x25C6, 0x25C8 }, { 0x25CB, 0x25CB },
|
| 207 |
|
|
{ 0x25CE, 0x25D1 }, { 0x25E2, 0x25E5 }, { 0x25EF, 0x25EF },
|
| 208 |
|
|
{ 0x2605, 0x2606 }, { 0x2609, 0x2609 }, { 0x260E, 0x260F },
|
| 209 |
|
|
{ 0x261C, 0x261C }, { 0x261E, 0x261E }, { 0x2640, 0x2640 },
|
| 210 |
|
|
{ 0x2642, 0x2642 }, { 0x2660, 0x2661 }, { 0x2663, 0x2665 },
|
| 211 |
|
|
{ 0x2667, 0x266A }, { 0x266C, 0x266D }, { 0x266F, 0x266F },
|
| 212 |
|
|
{ 0x273D, 0x273D }, { 0x3008, 0x300B }, { 0x3014, 0x3015 },
|
| 213 |
|
|
{ 0x3018, 0x301B }, { 0xFFFD, 0xFFFD }
|
| 214 |
|
|
};
|
| 215 |
|
|
|
| 216 |
|
|
/* binary search in table of non-spacing characters */
|
| 217 |
|
|
if (bisearch(ucs, ambiguous,
|
| 218 |
|
|
sizeof(ambiguous) / sizeof(struct interval) - 1))
|
| 219 |
|
|
return 2;
|
| 220 |
|
|
|
| 221 |
|
|
return wcwidth(ucs);
|
| 222 |
|
|
}
|
| 223 |
|
|
|
| 224 |
|
|
|
| 225 |
|
|
int wcswidth_cjk(const wchar_t *pwcs, size_t n)
|
| 226 |
|
|
{
|
| 227 |
|
|
int w, width = 0;
|
| 228 |
|
|
|
| 229 |
|
|
for (;*pwcs && n-- > 0; pwcs++)
|
| 230 |
|
|
if ((w = wcwidth_cjk(*pwcs)) < 0)
|
| 231 |
|
|
return -1;
|
| 232 |
|
|
else
|
| 233 |
|
|
width += w;
|
| 234 |
|
|
|
| 235 |
|
|
return width;
|
| 236 |
|
|
}
|
