1 | /* |
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2 | * This is an implementation of wcwidth() and wcswidth() (defined in |
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3 | * IEEE Std 1002.1-2001) for Unicode. |
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4 | * |
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5 | * http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html |
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6 | * http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html |
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7 | * |
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8 | * In fixed-width output devices, Latin characters all occupy a single |
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9 | * "cell" position of equal width, whereas ideographic CJK characters |
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10 | * occupy two such cells. Interoperability between terminal-line |
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11 | * applications and (teletype-style) character terminals using the |
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12 | * UTF-8 encoding requires agreement on which character should advance |
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13 | * the cursor by how many cell positions. No established formal |
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14 | * standards exist at present on which Unicode character shall occupy |
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15 | * how many cell positions on character terminals. These routines are |
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16 | * a first attempt of defining such behavior based on simple rules |
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17 | * applied to data provided by the Unicode Consortium. |
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18 | * |
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19 | * For some graphical characters, the Unicode standard explicitly |
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20 | * defines a character-cell width via the definition of the East Asian |
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21 | * FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes. |
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22 | * In all these cases, there is no ambiguity about which width a |
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23 | * terminal shall use. For characters in the East Asian Ambiguous (A) |
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24 | * class, the width choice depends purely on a preference of backward |
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25 | * compatibility with either historic CJK or Western practice. |
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26 | * Choosing single-width for these characters is easy to justify as |
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27 | * the appropriate long-term solution, as the CJK practice of |
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28 | * displaying these characters as double-width comes from historic |
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29 | * implementation simplicity (8-bit encoded characters were displayed |
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30 | * single-width and 16-bit ones double-width, even for Greek, |
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31 | * Cyrillic, etc.) and not any typographic considerations. |
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32 | * |
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33 | * Much less clear is the choice of width for the Not East Asian |
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34 | * (Neutral) class. Existing practice does not dictate a width for any |
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35 | * of these characters. It would nevertheless make sense |
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36 | * typographically to allocate two character cells to characters such |
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37 | * as for instance EM SPACE or VOLUME INTEGRAL, which cannot be |
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38 | * represented adequately with a single-width glyph. The following |
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39 | * routines at present merely assign a single-cell width to all |
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40 | * neutral characters, in the interest of simplicity. This is not |
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41 | * entirely satisfactory and should be reconsidered before |
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42 | * establishing a formal standard in this area. At the moment, the |
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43 | * decision which Not East Asian (Neutral) characters should be |
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44 | * represented by double-width glyphs cannot yet be answered by |
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45 | * applying a simple rule from the Unicode database content. Setting |
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46 | * up a proper standard for the behavior of UTF-8 character terminals |
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47 | * will require a careful analysis not only of each Unicode character, |
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48 | * but also of each presentation form, something the author of these |
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49 | * routines has avoided to do so far. |
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50 | * |
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51 | * http://www.unicode.org/unicode/reports/tr11/ |
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52 | * |
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53 | * Markus Kuhn -- 2007-05-26 (Unicode 5.0) |
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54 | * |
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55 | * Permission to use, copy, modify, and distribute this software |
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56 | * for any purpose and without fee is hereby granted. The author |
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57 | * disclaims all warranties with regard to this software. |
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58 | * |
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59 | * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c |
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60 | */ |
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61 | |
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62 | #include <wchar.h> |
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63 | |
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64 | struct interval { /* noproto */ |
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65 | int first; |
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66 | int last; |
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67 | }; |
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68 | |
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69 | /* auxiliary function for binary search in interval table */ |
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70 | static int bisearch(wchar_t ucs, const struct interval *table, int max) { |
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71 | int min = 0; |
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72 | int mid; |
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73 | |
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74 | if (ucs < table[0].first || ucs > table[max].last) |
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75 | return 0; |
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76 | while (max >= min) { |
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77 | mid = (min + max) / 2; |
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78 | if (ucs > table[mid].last) |
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79 | min = mid + 1; |
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80 | else if (ucs < table[mid].first) |
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81 | max = mid - 1; |
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82 | else |
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83 | return 1; |
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84 | } |
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85 | |
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86 | return 0; |
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87 | } |
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88 | |
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89 | |
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90 | /* The following two functions define the column width of an ISO 10646 |
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91 | * character as follows: |
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92 | * |
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93 | * - The null character (U+0000) has a column width of 0. |
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94 | * |
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95 | * - Other C0/C1 control characters and DEL will lead to a return |
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96 | * value of -1. |
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97 | * |
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98 | * - Non-spacing and enclosing combining characters (general |
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99 | * category code Mn or Me in the Unicode database) have a |
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100 | * column width of 0. |
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101 | * |
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102 | * - SOFT HYPHEN (U+00AD) has a column width of 1. |
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103 | * |
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104 | * - Other format characters (general category code Cf in the Unicode |
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105 | * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0. |
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106 | * |
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107 | * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF) |
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108 | * have a column width of 0. |
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109 | * |
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110 | * - Spacing characters in the East Asian Wide (W) or East Asian |
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111 | * Full-width (F) category as defined in Unicode Technical |
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112 | * Report #11 have a column width of 2. |
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113 | * |
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114 | * - All remaining characters (including all printable |
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115 | * ISO 8859-1 and WGL4 characters, Unicode control characters, |
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116 | * etc.) have a column width of 1. |
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117 | * |
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118 | * This implementation assumes that wchar_t characters are encoded |
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119 | * in ISO 10646. |
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120 | */ |
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121 | |
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122 | int mk_wcwidth(wchar_t ucs) |
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123 | { |
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124 | /* sorted list of non-overlapping intervals of non-spacing characters */ |
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125 | /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */ |
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126 | static const struct interval combining[] = { |
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127 | { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 }, |
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128 | { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 }, |
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129 | { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 }, |
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130 | { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 }, |
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131 | { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED }, |
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132 | { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A }, |
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133 | { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 }, |
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134 | { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D }, |
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135 | { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 }, |
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136 | { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD }, |
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137 | { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C }, |
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138 | { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D }, |
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139 | { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC }, |
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140 | { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD }, |
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141 | { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C }, |
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142 | { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D }, |
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143 | { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 }, |
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144 | { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 }, |
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145 | { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC }, |
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146 | { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD }, |
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147 | { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D }, |
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148 | { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 }, |
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149 | { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E }, |
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150 | { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC }, |
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151 | { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 }, |
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152 | { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E }, |
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153 | { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 }, |
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154 | { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 }, |
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155 | { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 }, |
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156 | { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F }, |
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157 | { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 }, |
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158 | { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD }, |
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159 | { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD }, |
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160 | { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 }, |
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161 | { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B }, |
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162 | { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 }, |
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163 | { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 }, |
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164 | { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF }, |
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165 | { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 }, |
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166 | { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F }, |
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167 | { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B }, |
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168 | { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F }, |
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169 | { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB }, |
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170 | { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F }, |
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171 | { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 }, |
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172 | { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD }, |
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173 | { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F }, |
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174 | { 0xE0100, 0xE01EF } |
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175 | }; |
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176 | |
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177 | /* test for 8-bit control characters */ |
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178 | if (ucs == 0) |
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179 | return 0; |
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180 | if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0)) |
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181 | return -1; |
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182 | |
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183 | /* binary search in table of non-spacing characters */ |
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184 | if (bisearch(ucs, combining, |
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185 | sizeof(combining) / sizeof(struct interval) - 1)) |
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186 | return 0; |
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187 | |
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188 | /* if we arrive here, ucs is not a combining or C0/C1 control character */ |
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189 | |
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190 | return 1 + |
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191 | (ucs >= 0x1100 && |
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192 | (ucs <= 0x115f || /* Hangul Jamo init. consonants */ |
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193 | ucs == 0x2329 || ucs == 0x232a || |
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194 | (ucs >= 0x2e80 && ucs <= 0xa4cf && |
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195 | ucs != 0x303f) || /* CJK ... Yi */ |
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196 | (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */ |
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197 | (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */ |
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198 | (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */ |
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199 | (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */ |
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200 | (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */ |
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201 | (ucs >= 0xffe0 && ucs <= 0xffe6) || |
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202 | (ucs >= 0x20000 && ucs <= 0x2fffd) || |
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203 | (ucs >= 0x30000 && ucs <= 0x3fffd))); |
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204 | } |
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205 | |
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206 | |
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207 | int mk_wcswidth(const wchar_t *pwcs, size_t n) |
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208 | { |
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209 | int w, width = 0; |
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210 | |
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211 | for (;*pwcs && n-- > 0; pwcs++) |
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212 | if ((w = mk_wcwidth(*pwcs)) < 0) |
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213 | return -1; |
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214 | else |
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215 | width += w; |
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216 | |
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217 | return width; |
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218 | } |
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219 | |
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220 | |
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221 | /* |
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222 | * The following functions are the same as mk_wcwidth() and |
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223 | * mk_wcswidth(), except that spacing characters in the East Asian |
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224 | * Ambiguous (A) category as defined in Unicode Technical Report #11 |
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225 | * have a column width of 2. This variant might be useful for users of |
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226 | * CJK legacy encodings who want to migrate to UCS without changing |
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227 | * the traditional terminal character-width behaviour. It is not |
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228 | * otherwise recommended for general use. |
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229 | */ |
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230 | int mk_wcwidth_cjk(wchar_t ucs) |
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231 | { |
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232 | /* sorted list of non-overlapping intervals of East Asian Ambiguous |
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233 | * characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c" */ |
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234 | static const struct interval ambiguous[] = { |
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235 | { 0x00A1, 0x00A1 }, { 0x00A4, 0x00A4 }, { 0x00A7, 0x00A8 }, |
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236 | { 0x00AA, 0x00AA }, { 0x00AE, 0x00AE }, { 0x00B0, 0x00B4 }, |
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237 | { 0x00B6, 0x00BA }, { 0x00BC, 0x00BF }, { 0x00C6, 0x00C6 }, |
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238 | { 0x00D0, 0x00D0 }, { 0x00D7, 0x00D8 }, { 0x00DE, 0x00E1 }, |
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239 | { 0x00E6, 0x00E6 }, { 0x00E8, 0x00EA }, { 0x00EC, 0x00ED }, |
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240 | { 0x00F0, 0x00F0 }, { 0x00F2, 0x00F3 }, { 0x00F7, 0x00FA }, |
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241 | { 0x00FC, 0x00FC }, { 0x00FE, 0x00FE }, { 0x0101, 0x0101 }, |
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242 | { 0x0111, 0x0111 }, { 0x0113, 0x0113 }, { 0x011B, 0x011B }, |
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243 | { 0x0126, 0x0127 }, { 0x012B, 0x012B }, { 0x0131, 0x0133 }, |
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244 | { 0x0138, 0x0138 }, { 0x013F, 0x0142 }, { 0x0144, 0x0144 }, |
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245 | { 0x0148, 0x014B }, { 0x014D, 0x014D }, { 0x0152, 0x0153 }, |
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246 | { 0x0166, 0x0167 }, { 0x016B, 0x016B }, { 0x01CE, 0x01CE }, |
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247 | { 0x01D0, 0x01D0 }, { 0x01D2, 0x01D2 }, { 0x01D4, 0x01D4 }, |
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248 | { 0x01D6, 0x01D6 }, { 0x01D8, 0x01D8 }, { 0x01DA, 0x01DA }, |
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249 | { 0x01DC, 0x01DC }, { 0x0251, 0x0251 }, { 0x0261, 0x0261 }, |
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250 | { 0x02C4, 0x02C4 }, { 0x02C7, 0x02C7 }, { 0x02C9, 0x02CB }, |
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251 | { 0x02CD, 0x02CD }, { 0x02D0, 0x02D0 }, { 0x02D8, 0x02DB }, |
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252 | { 0x02DD, 0x02DD }, { 0x02DF, 0x02DF }, { 0x0391, 0x03A1 }, |
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253 | { 0x03A3, 0x03A9 }, { 0x03B1, 0x03C1 }, { 0x03C3, 0x03C9 }, |
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254 | { 0x0401, 0x0401 }, { 0x0410, 0x044F }, { 0x0451, 0x0451 }, |
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255 | { 0x2010, 0x2010 }, { 0x2013, 0x2016 }, { 0x2018, 0x2019 }, |
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256 | { 0x201C, 0x201D }, { 0x2020, 0x2022 }, { 0x2024, 0x2027 }, |
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257 | { 0x2030, 0x2030 }, { 0x2032, 0x2033 }, { 0x2035, 0x2035 }, |
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258 | { 0x203B, 0x203B }, { 0x203E, 0x203E }, { 0x2074, 0x2074 }, |
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259 | { 0x207F, 0x207F }, { 0x2081, 0x2084 }, { 0x20AC, 0x20AC }, |
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260 | { 0x2103, 0x2103 }, { 0x2105, 0x2105 }, { 0x2109, 0x2109 }, |
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261 | { 0x2113, 0x2113 }, { 0x2116, 0x2116 }, { 0x2121, 0x2122 }, |
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262 | { 0x2126, 0x2126 }, { 0x212B, 0x212B }, { 0x2153, 0x2154 }, |
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263 | { 0x215B, 0x215E }, { 0x2160, 0x216B }, { 0x2170, 0x2179 }, |
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264 | { 0x2190, 0x2199 }, { 0x21B8, 0x21B9 }, { 0x21D2, 0x21D2 }, |
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265 | { 0x21D4, 0x21D4 }, { 0x21E7, 0x21E7 }, { 0x2200, 0x2200 }, |
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266 | { 0x2202, 0x2203 }, { 0x2207, 0x2208 }, { 0x220B, 0x220B }, |
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267 | { 0x220F, 0x220F }, { 0x2211, 0x2211 }, { 0x2215, 0x2215 }, |
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268 | { 0x221A, 0x221A }, { 0x221D, 0x2220 }, { 0x2223, 0x2223 }, |
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269 | { 0x2225, 0x2225 }, { 0x2227, 0x222C }, { 0x222E, 0x222E }, |
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270 | { 0x2234, 0x2237 }, { 0x223C, 0x223D }, { 0x2248, 0x2248 }, |
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271 | { 0x224C, 0x224C }, { 0x2252, 0x2252 }, { 0x2260, 0x2261 }, |
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272 | { 0x2264, 0x2267 }, { 0x226A, 0x226B }, { 0x226E, 0x226F }, |
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273 | { 0x2282, 0x2283 }, { 0x2286, 0x2287 }, { 0x2295, 0x2295 }, |
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274 | { 0x2299, 0x2299 }, { 0x22A5, 0x22A5 }, { 0x22BF, 0x22BF }, |
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275 | { 0x2312, 0x2312 }, { 0x2460, 0x24E9 }, { 0x24EB, 0x254B }, |
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276 | { 0x2550, 0x2573 }, { 0x2580, 0x258F }, { 0x2592, 0x2595 }, |
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277 | { 0x25A0, 0x25A1 }, { 0x25A3, 0x25A9 }, { 0x25B2, 0x25B3 }, |
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278 | { 0x25B6, 0x25B7 }, { 0x25BC, 0x25BD }, { 0x25C0, 0x25C1 }, |
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279 | { 0x25C6, 0x25C8 }, { 0x25CB, 0x25CB }, { 0x25CE, 0x25D1 }, |
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280 | { 0x25E2, 0x25E5 }, { 0x25EF, 0x25EF }, { 0x2605, 0x2606 }, |
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281 | { 0x2609, 0x2609 }, { 0x260E, 0x260F }, { 0x2614, 0x2615 }, |
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282 | { 0x261C, 0x261C }, { 0x261E, 0x261E }, { 0x2640, 0x2640 }, |
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283 | { 0x2642, 0x2642 }, { 0x2660, 0x2661 }, { 0x2663, 0x2665 }, |
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284 | { 0x2667, 0x266A }, { 0x266C, 0x266D }, { 0x266F, 0x266F }, |
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285 | { 0x273D, 0x273D }, { 0x2776, 0x277F }, { 0xE000, 0xF8FF }, |
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286 | { 0xFFFD, 0xFFFD }, { 0xF0000, 0xFFFFD }, { 0x100000, 0x10FFFD } |
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287 | }; |
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288 | |
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289 | /* binary search in table of non-spacing characters */ |
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290 | if (bisearch(ucs, ambiguous, |
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291 | sizeof(ambiguous) / sizeof(struct interval) - 1)) |
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292 | return 2; |
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293 | |
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294 | return mk_wcwidth(ucs); |
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295 | } |
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296 | |
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297 | |
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298 | int mk_wcswidth_cjk(const wchar_t *pwcs, size_t n) |
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299 | { |
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300 | int w, width = 0; |
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301 | |
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302 | for (;*pwcs && n-- > 0; pwcs++) |
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303 | if ((w = mk_wcwidth_cjk(*pwcs)) < 0) |
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304 | return -1; |
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305 | else |
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306 | width += w; |
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307 | |
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308 | return width; |
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309 | } |
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