source: wcwidth.c

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Last change on this file was 49a8434, checked in by Nelson Elhage <nelhage@mit.edu>, 9 years ago
Fix three small warnings.
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1/*
2 * This is an implementation of wcwidth() and wcswidth() (defined in
3 * IEEE Std 1002.1-2001) for Unicode.
4 *
5 * http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html
6 * http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html
7 *
8 * In fixed-width output devices, Latin characters all occupy a single
9 * "cell" position of equal width, whereas ideographic CJK characters
10 * occupy two such cells. Interoperability between terminal-line
11 * applications and (teletype-style) character terminals using the
12 * UTF-8 encoding requires agreement on which character should advance
13 * the cursor by how many cell positions. No established formal
14 * standards exist at present on which Unicode character shall occupy
15 * how many cell positions on character terminals. These routines are
16 * a first attempt of defining such behavior based on simple rules
17 * applied to data provided by the Unicode Consortium.
18 *
19 * For some graphical characters, the Unicode standard explicitly
20 * defines a character-cell width via the definition of the East Asian
21 * FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes.
22 * In all these cases, there is no ambiguity about which width a
23 * terminal shall use. For characters in the East Asian Ambiguous (A)
24 * class, the width choice depends purely on a preference of backward
25 * compatibility with either historic CJK or Western practice.
26 * Choosing single-width for these characters is easy to justify as
27 * the appropriate long-term solution, as the CJK practice of
28 * displaying these characters as double-width comes from historic
29 * implementation simplicity (8-bit encoded characters were displayed
30 * single-width and 16-bit ones double-width, even for Greek,
31 * Cyrillic, etc.) and not any typographic considerations.
32 *
33 * Much less clear is the choice of width for the Not East Asian
34 * (Neutral) class. Existing practice does not dictate a width for any
35 * of these characters. It would nevertheless make sense
36 * typographically to allocate two character cells to characters such
37 * as for instance EM SPACE or VOLUME INTEGRAL, which cannot be
38 * represented adequately with a single-width glyph. The following
39 * routines at present merely assign a single-cell width to all
40 * neutral characters, in the interest of simplicity. This is not
41 * entirely satisfactory and should be reconsidered before
42 * establishing a formal standard in this area. At the moment, the
43 * decision which Not East Asian (Neutral) characters should be
44 * represented by double-width glyphs cannot yet be answered by
45 * applying a simple rule from the Unicode database content. Setting
46 * up a proper standard for the behavior of UTF-8 character terminals
47 * will require a careful analysis not only of each Unicode character,
48 * but also of each presentation form, something the author of these
49 * routines has avoided to do so far.
50 *
51 * http://www.unicode.org/unicode/reports/tr11/
52 *
53 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
54 *
55 * Permission to use, copy, modify, and distribute this software
56 * for any purpose and without fee is hereby granted. The author
57 * disclaims all warranties with regard to this software.
58 *
59 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
60 */
61
62#include <wchar.h>
63
64struct interval {               /* noproto */
65  int first;
66  int last;
67};
68
69/* auxiliary function for binary search in interval table */
70static int bisearch(wchar_t ucs, const struct interval *table, int max) {
71  int min = 0;
72  int mid;
73
74  if (ucs < table[0].first || ucs > table[max].last)
75    return 0;
76  while (max >= min) {
77    mid = (min + max) / 2;
78    if (ucs > table[mid].last)
79      min = mid + 1;
80    else if (ucs < table[mid].first)
81      max = mid - 1;
82    else
83      return 1;
84  }
85
86  return 0;
87}
88
89
90/* The following two functions define the column width of an ISO 10646
91 * character as follows:
92 *
93 *    - The null character (U+0000) has a column width of 0.
94 *
95 *    - Other C0/C1 control characters and DEL will lead to a return
96 *      value of -1.
97 *
98 *    - Non-spacing and enclosing combining characters (general
99 *      category code Mn or Me in the Unicode database) have a
100 *      column width of 0.
101 *
102 *    - SOFT HYPHEN (U+00AD) has a column width of 1.
103 *
104 *    - Other format characters (general category code Cf in the Unicode
105 *      database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
106 *
107 *    - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
108 *      have a column width of 0.
109 *
110 *    - Spacing characters in the East Asian Wide (W) or East Asian
111 *      Full-width (F) category as defined in Unicode Technical
112 *      Report #11 have a column width of 2.
113 *
114 *    - All remaining characters (including all printable
115 *      ISO 8859-1 and WGL4 characters, Unicode control characters,
116 *      etc.) have a column width of 1.
117 *
118 * This implementation assumes that wchar_t characters are encoded
119 * in ISO 10646.
120 */
121
122int mk_wcwidth(wchar_t ucs)
123{
124  /* sorted list of non-overlapping intervals of non-spacing characters */
125  /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
126  static const struct interval combining[] = {
127    { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
128    { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
129    { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
130    { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
131    { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
132    { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
133    { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
134    { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
135    { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
136    { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
137    { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
138    { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
139    { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
140    { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
141    { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
142    { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
143    { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
144    { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
145    { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
146    { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
147    { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
148    { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
149    { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
150    { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
151    { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
152    { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
153    { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
154    { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
155    { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
156    { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
157    { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
158    { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
159    { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
160    { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
161    { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
162    { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
163    { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
164    { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
165    { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
166    { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
167    { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
168    { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
169    { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
170    { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
171    { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
172    { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
173    { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
174    { 0xE0100, 0xE01EF }
175  };
176
177  /* test for 8-bit control characters */
178  if (ucs == 0)
179    return 0;
180  if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
181    return -1;
182
183  /* binary search in table of non-spacing characters */
184  if (bisearch(ucs, combining,
185               sizeof(combining) / sizeof(struct interval) - 1))
186    return 0;
187
188  /* if we arrive here, ucs is not a combining or C0/C1 control character */
189
190  return 1 + 
191    (ucs >= 0x1100 &&
192     (ucs <= 0x115f ||                    /* Hangul Jamo init. consonants */
193      ucs == 0x2329 || ucs == 0x232a ||
194      (ucs >= 0x2e80 && ucs <= 0xa4cf &&
195       ucs != 0x303f) ||                  /* CJK ... Yi */
196      (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
197      (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
198      (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
199      (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
200      (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
201      (ucs >= 0xffe0 && ucs <= 0xffe6) ||
202      (ucs >= 0x20000 && ucs <= 0x2fffd) ||
203      (ucs >= 0x30000 && ucs <= 0x3fffd)));
204}
205
206
207int mk_wcswidth(const wchar_t *pwcs, size_t n)
208{
209  int w, width = 0;
210
211  for (;*pwcs && n-- > 0; pwcs++)
212    if ((w = mk_wcwidth(*pwcs)) < 0)
213      return -1;
214    else
215      width += w;
216
217  return width;
218}
219
220
221/*
222 * The following functions are the same as mk_wcwidth() and
223 * mk_wcswidth(), except that spacing characters in the East Asian
224 * Ambiguous (A) category as defined in Unicode Technical Report #11
225 * have a column width of 2. This variant might be useful for users of
226 * CJK legacy encodings who want to migrate to UCS without changing
227 * the traditional terminal character-width behaviour. It is not
228 * otherwise recommended for general use.
229 */
230int mk_wcwidth_cjk(wchar_t ucs)
231{
232  /* sorted list of non-overlapping intervals of East Asian Ambiguous
233   * characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c" */
234  static const struct interval ambiguous[] = {
235    { 0x00A1, 0x00A1 }, { 0x00A4, 0x00A4 }, { 0x00A7, 0x00A8 },
236    { 0x00AA, 0x00AA }, { 0x00AE, 0x00AE }, { 0x00B0, 0x00B4 },
237    { 0x00B6, 0x00BA }, { 0x00BC, 0x00BF }, { 0x00C6, 0x00C6 },
238    { 0x00D0, 0x00D0 }, { 0x00D7, 0x00D8 }, { 0x00DE, 0x00E1 },
239    { 0x00E6, 0x00E6 }, { 0x00E8, 0x00EA }, { 0x00EC, 0x00ED },
240    { 0x00F0, 0x00F0 }, { 0x00F2, 0x00F3 }, { 0x00F7, 0x00FA },
241    { 0x00FC, 0x00FC }, { 0x00FE, 0x00FE }, { 0x0101, 0x0101 },
242    { 0x0111, 0x0111 }, { 0x0113, 0x0113 }, { 0x011B, 0x011B },
243    { 0x0126, 0x0127 }, { 0x012B, 0x012B }, { 0x0131, 0x0133 },
244    { 0x0138, 0x0138 }, { 0x013F, 0x0142 }, { 0x0144, 0x0144 },
245    { 0x0148, 0x014B }, { 0x014D, 0x014D }, { 0x0152, 0x0153 },
246    { 0x0166, 0x0167 }, { 0x016B, 0x016B }, { 0x01CE, 0x01CE },
247    { 0x01D0, 0x01D0 }, { 0x01D2, 0x01D2 }, { 0x01D4, 0x01D4 },
248    { 0x01D6, 0x01D6 }, { 0x01D8, 0x01D8 }, { 0x01DA, 0x01DA },
249    { 0x01DC, 0x01DC }, { 0x0251, 0x0251 }, { 0x0261, 0x0261 },
250    { 0x02C4, 0x02C4 }, { 0x02C7, 0x02C7 }, { 0x02C9, 0x02CB },
251    { 0x02CD, 0x02CD }, { 0x02D0, 0x02D0 }, { 0x02D8, 0x02DB },
252    { 0x02DD, 0x02DD }, { 0x02DF, 0x02DF }, { 0x0391, 0x03A1 },
253    { 0x03A3, 0x03A9 }, { 0x03B1, 0x03C1 }, { 0x03C3, 0x03C9 },
254    { 0x0401, 0x0401 }, { 0x0410, 0x044F }, { 0x0451, 0x0451 },
255    { 0x2010, 0x2010 }, { 0x2013, 0x2016 }, { 0x2018, 0x2019 },
256    { 0x201C, 0x201D }, { 0x2020, 0x2022 }, { 0x2024, 0x2027 },
257    { 0x2030, 0x2030 }, { 0x2032, 0x2033 }, { 0x2035, 0x2035 },
258    { 0x203B, 0x203B }, { 0x203E, 0x203E }, { 0x2074, 0x2074 },
259    { 0x207F, 0x207F }, { 0x2081, 0x2084 }, { 0x20AC, 0x20AC },
260    { 0x2103, 0x2103 }, { 0x2105, 0x2105 }, { 0x2109, 0x2109 },
261    { 0x2113, 0x2113 }, { 0x2116, 0x2116 }, { 0x2121, 0x2122 },
262    { 0x2126, 0x2126 }, { 0x212B, 0x212B }, { 0x2153, 0x2154 },
263    { 0x215B, 0x215E }, { 0x2160, 0x216B }, { 0x2170, 0x2179 },
264    { 0x2190, 0x2199 }, { 0x21B8, 0x21B9 }, { 0x21D2, 0x21D2 },
265    { 0x21D4, 0x21D4 }, { 0x21E7, 0x21E7 }, { 0x2200, 0x2200 },
266    { 0x2202, 0x2203 }, { 0x2207, 0x2208 }, { 0x220B, 0x220B },
267    { 0x220F, 0x220F }, { 0x2211, 0x2211 }, { 0x2215, 0x2215 },
268    { 0x221A, 0x221A }, { 0x221D, 0x2220 }, { 0x2223, 0x2223 },
269    { 0x2225, 0x2225 }, { 0x2227, 0x222C }, { 0x222E, 0x222E },
270    { 0x2234, 0x2237 }, { 0x223C, 0x223D }, { 0x2248, 0x2248 },
271    { 0x224C, 0x224C }, { 0x2252, 0x2252 }, { 0x2260, 0x2261 },
272    { 0x2264, 0x2267 }, { 0x226A, 0x226B }, { 0x226E, 0x226F },
273    { 0x2282, 0x2283 }, { 0x2286, 0x2287 }, { 0x2295, 0x2295 },
274    { 0x2299, 0x2299 }, { 0x22A5, 0x22A5 }, { 0x22BF, 0x22BF },
275    { 0x2312, 0x2312 }, { 0x2460, 0x24E9 }, { 0x24EB, 0x254B },
276    { 0x2550, 0x2573 }, { 0x2580, 0x258F }, { 0x2592, 0x2595 },
277    { 0x25A0, 0x25A1 }, { 0x25A3, 0x25A9 }, { 0x25B2, 0x25B3 },
278    { 0x25B6, 0x25B7 }, { 0x25BC, 0x25BD }, { 0x25C0, 0x25C1 },
279    { 0x25C6, 0x25C8 }, { 0x25CB, 0x25CB }, { 0x25CE, 0x25D1 },
280    { 0x25E2, 0x25E5 }, { 0x25EF, 0x25EF }, { 0x2605, 0x2606 },
281    { 0x2609, 0x2609 }, { 0x260E, 0x260F }, { 0x2614, 0x2615 },
282    { 0x261C, 0x261C }, { 0x261E, 0x261E }, { 0x2640, 0x2640 },
283    { 0x2642, 0x2642 }, { 0x2660, 0x2661 }, { 0x2663, 0x2665 },
284    { 0x2667, 0x266A }, { 0x266C, 0x266D }, { 0x266F, 0x266F },
285    { 0x273D, 0x273D }, { 0x2776, 0x277F }, { 0xE000, 0xF8FF },
286    { 0xFFFD, 0xFFFD }, { 0xF0000, 0xFFFFD }, { 0x100000, 0x10FFFD }
287  };
288
289  /* binary search in table of non-spacing characters */
290  if (bisearch(ucs, ambiguous,
291               sizeof(ambiguous) / sizeof(struct interval) - 1))
292    return 2;
293
294  return mk_wcwidth(ucs);
295}
296
297
298int mk_wcswidth_cjk(const wchar_t *pwcs, size_t n)
299{
300  int w, width = 0;
301
302  for (;*pwcs && n-- > 0; pwcs++)
303    if ((w = mk_wcwidth_cjk(*pwcs)) < 0)
304      return -1;
305    else
306      width += w;
307
308  return width;
309}
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