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9e83266 @dscho commit-tree: encourage UTF-8 commit messages.
dscho authored
1 #include "git-compat-util.h"
2 #include "utf8.h"
3
4 /* This code is originally from http://www.cl.cam.ac.uk/~mgk25/ucs/ */
5
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6 typedef unsigned int ucs_char_t; /* assuming 32bit int */
7
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8 struct interval {
9 int first;
10 int last;
11 };
12
13 /* auxiliary function for binary search in interval table */
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14 static int bisearch(ucs_char_t ucs, const struct interval *table, int max) {
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15 int min = 0;
16 int mid;
17
18 if (ucs < table[0].first || ucs > table[max].last)
19 return 0;
20 while (max >= min) {
21 mid = (min + max) / 2;
22 if (ucs > table[mid].last)
23 min = mid + 1;
24 else if (ucs < table[mid].first)
25 max = mid - 1;
26 else
27 return 1;
28 }
29
30 return 0;
31 }
32
33 /* The following two functions define the column width of an ISO 10646
34 * character as follows:
35 *
36 * - The null character (U+0000) has a column width of 0.
37 *
38 * - Other C0/C1 control characters and DEL will lead to a return
39 * value of -1.
40 *
41 * - Non-spacing and enclosing combining characters (general
42 * category code Mn or Me in the Unicode database) have a
43 * column width of 0.
44 *
45 * - SOFT HYPHEN (U+00AD) has a column width of 1.
46 *
47 * - Other format characters (general category code Cf in the Unicode
48 * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
49 *
50 * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
51 * have a column width of 0.
52 *
53 * - Spacing characters in the East Asian Wide (W) or East Asian
54 * Full-width (F) category as defined in Unicode Technical
55 * Report #11 have a column width of 2.
56 *
57 * - All remaining characters (including all printable
58 * ISO 8859-1 and WGL4 characters, Unicode control characters,
59 * etc.) have a column width of 1.
60 *
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61 * This implementation assumes that ucs_char_t characters are encoded
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62 * in ISO 10646.
63 */
64
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65 static int wcwidth(ucs_char_t ch)
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66 {
67 /*
68 * Sorted list of non-overlapping intervals of non-spacing characters,
69 * generated by
70 * "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c".
71 */
72 static const struct interval combining[] = {
73 { 0x0300, 0x0357 }, { 0x035D, 0x036F }, { 0x0483, 0x0486 },
74 { 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 },
75 { 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
76 { 0x05C4, 0x05C4 }, { 0x0600, 0x0603 }, { 0x0610, 0x0615 },
77 { 0x064B, 0x0658 }, { 0x0670, 0x0670 }, { 0x06D6, 0x06E4 },
78 { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED }, { 0x070F, 0x070F },
79 { 0x0711, 0x0711 }, { 0x0730, 0x074A }, { 0x07A6, 0x07B0 },
80 { 0x0901, 0x0902 }, { 0x093C, 0x093C }, { 0x0941, 0x0948 },
81 { 0x094D, 0x094D }, { 0x0951, 0x0954 }, { 0x0962, 0x0963 },
82 { 0x0981, 0x0981 }, { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 },
83 { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 },
84 { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 },
85 { 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 },
86 { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 },
87 { 0x0ACD, 0x0ACD }, { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 },
88 { 0x0B3C, 0x0B3C }, { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 },
89 { 0x0B4D, 0x0B4D }, { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 },
90 { 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 },
91 { 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 },
92 { 0x0CBC, 0x0CBC }, { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 },
93 { 0x0CCC, 0x0CCD }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
94 { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
95 { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
96 { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
97 { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
98 { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
99 { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
100 { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
101 { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
102 { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x1712, 0x1714 },
103 { 0x1732, 0x1734 }, { 0x1752, 0x1753 }, { 0x1772, 0x1773 },
104 { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD }, { 0x17C6, 0x17C6 },
105 { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD }, { 0x180B, 0x180D },
106 { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 }, { 0x1927, 0x1928 },
107 { 0x1932, 0x1932 }, { 0x1939, 0x193B }, { 0x200B, 0x200F },
108 { 0x202A, 0x202E }, { 0x2060, 0x2063 }, { 0x206A, 0x206F },
109 { 0x20D0, 0x20EA }, { 0x302A, 0x302F }, { 0x3099, 0x309A },
110 { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F }, { 0xFE20, 0xFE23 },
111 { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB }, { 0x1D167, 0x1D169 },
112 { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B },
113 { 0x1D1AA, 0x1D1AD }, { 0xE0001, 0xE0001 },
114 { 0xE0020, 0xE007F }, { 0xE0100, 0xE01EF }
115 };
116
117 /* test for 8-bit control characters */
118 if (ch == 0)
119 return 0;
120 if (ch < 32 || (ch >= 0x7f && ch < 0xa0))
121 return -1;
122
123 /* binary search in table of non-spacing characters */
124 if (bisearch(ch, combining, sizeof(combining)
125 / sizeof(struct interval) - 1))
126 return 0;
127
128 /*
129 * If we arrive here, ch is neither a combining nor a C0/C1
130 * control character.
131 */
132
133 return 1 +
134 (ch >= 0x1100 &&
135 /* Hangul Jamo init. consonants */
136 (ch <= 0x115f ||
137 ch == 0x2329 || ch == 0x232a ||
138 /* CJK ... Yi */
139 (ch >= 0x2e80 && ch <= 0xa4cf &&
140 ch != 0x303f) ||
141 /* Hangul Syllables */
142 (ch >= 0xac00 && ch <= 0xd7a3) ||
143 /* CJK Compatibility Ideographs */
144 (ch >= 0xf900 && ch <= 0xfaff) ||
145 /* CJK Compatibility Forms */
146 (ch >= 0xfe30 && ch <= 0xfe6f) ||
147 /* Fullwidth Forms */
148 (ch >= 0xff00 && ch <= 0xff60) ||
149 (ch >= 0xffe0 && ch <= 0xffe6) ||
150 (ch >= 0x20000 && ch <= 0x2fffd) ||
151 (ch >= 0x30000 && ch <= 0x3fffd)));
152 }
153
154 /*
155 * This function returns the number of columns occupied by the character
156 * pointed to by the variable start. The pointer is updated to point at
157 * the next character. If it was not valid UTF-8, the pointer is set to NULL.
158 */
159 int utf8_width(const char **start)
160 {
161 unsigned char *s = (unsigned char *)*start;
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162 ucs_char_t ch;
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163
164 if (*s < 0x80) {
165 /* 0xxxxxxx */
166 ch = *s;
167 *start += 1;
168 } else if ((s[0] & 0xe0) == 0xc0) {
169 /* 110XXXXx 10xxxxxx */
170 if ((s[1] & 0xc0) != 0x80 ||
171 /* overlong? */
172 (s[0] & 0xfe) == 0xc0)
173 goto invalid;
174 ch = ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
175 *start += 2;
176 } else if ((s[0] & 0xf0) == 0xe0) {
177 /* 1110XXXX 10Xxxxxx 10xxxxxx */
178 if ((s[1] & 0xc0) != 0x80 ||
179 (s[2] & 0xc0) != 0x80 ||
180 /* overlong? */
181 (s[0] == 0xe0 && (s[1] & 0xe0) == 0x80) ||
182 /* surrogate? */
183 (s[0] == 0xed && (s[1] & 0xe0) == 0xa0) ||
184 /* U+FFFE or U+FFFF? */
185 (s[0] == 0xef && s[1] == 0xbf &&
186 (s[2] & 0xfe) == 0xbe))
187 goto invalid;
188 ch = ((s[0] & 0x0f) << 12) |
189 ((s[1] & 0x3f) << 6) | (s[2] & 0x3f);
190 *start += 3;
191 } else if ((s[0] & 0xf8) == 0xf0) {
192 /* 11110XXX 10XXxxxx 10xxxxxx 10xxxxxx */
193 if ((s[1] & 0xc0) != 0x80 ||
194 (s[2] & 0xc0) != 0x80 ||
195 (s[3] & 0xc0) != 0x80 ||
196 /* overlong? */
197 (s[0] == 0xf0 && (s[1] & 0xf0) == 0x80) ||
198 /* > U+10FFFF? */
199 (s[0] == 0xf4 && s[1] > 0x8f) || s[0] > 0xf4)
200 goto invalid;
201 ch = ((s[0] & 0x07) << 18) | ((s[1] & 0x3f) << 12) |
202 ((s[2] & 0x3f) << 6) | (s[3] & 0x3f);
203 *start += 4;
204 } else {
205 invalid:
206 *start = NULL;
207 return 0;
208 }
209
210 return wcwidth(ch);
211 }
212
213 int is_utf8(const char *text)
214 {
215 while (*text) {
216 if (*text == '\n' || *text == '\t' || *text == '\r') {
217 text++;
218 continue;
219 }
220 utf8_width(&text);
221 if (!text)
222 return 0;
223 }
224 return 1;
225 }
226
227 static void print_spaces(int count)
228 {
229 static const char s[] = " ";
230 while (count >= sizeof(s)) {
231 fwrite(s, sizeof(s) - 1, 1, stdout);
232 count -= sizeof(s) - 1;
233 }
234 fwrite(s, count, 1, stdout);
235 }
236
237 /*
238 * Wrap the text, if necessary. The variable indent is the indent for the
239 * first line, indent2 is the indent for all other lines.
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240 * If indent is negative, assume that already -indent columns have been
241 * consumed (and no extra indent is necessary for the first line).
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242 */
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243 int print_wrapped_text(const char *text, int indent, int indent2, int width)
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244 {
245 int w = indent, assume_utf8 = is_utf8(text);
246 const char *bol = text, *space = NULL;
247
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248 if (indent < 0) {
249 w = -indent;
250 space = text;
251 }
252
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253 for (;;) {
254 char c = *text;
255 if (!c || isspace(c)) {
256 if (w < width || !space) {
257 const char *start = bol;
258 if (space)
259 start = space;
260 else
261 print_spaces(indent);
262 fwrite(start, text - start, 1, stdout);
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263 if (!c)
264 return w;
265 else if (c == '\t')
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266 w |= 0x07;
267 space = text;
268 w++;
269 text++;
270 }
271 else {
272 putchar('\n');
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273 text = bol = space + isspace(*space);
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274 space = NULL;
275 w = indent = indent2;
276 }
277 continue;
278 }
279 if (assume_utf8)
280 w += utf8_width(&text);
281 else {
282 w++;
283 text++;
284 }
285 }
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286 return w;
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287 }
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288
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289 int is_encoding_utf8(const char *name)
290 {
291 if (!name)
292 return 1;
293 if (!strcasecmp(name, "utf-8") || !strcasecmp(name, "utf8"))
294 return 1;
295 return 0;
296 }
297
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298 /*
299 * Given a buffer and its encoding, return it re-encoded
300 * with iconv. If the conversion fails, returns NULL.
301 */
302 #ifndef NO_ICONV
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303 #ifdef OLD_ICONV
304 typedef const char * iconv_ibp;
305 #else
306 typedef char * iconv_ibp;
307 #endif
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308 char *reencode_string(const char *in, const char *out_encoding, const char *in_encoding)
309 {
310 iconv_t conv;
311 size_t insz, outsz, outalloc;
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312 char *out, *outpos;
313 iconv_ibp cp;
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314
315 if (!in_encoding)
316 return NULL;
317 conv = iconv_open(out_encoding, in_encoding);
318 if (conv == (iconv_t) -1)
319 return NULL;
320 insz = strlen(in);
321 outsz = insz;
322 outalloc = outsz + 1; /* for terminating NUL */
323 out = xmalloc(outalloc);
324 outpos = out;
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325 cp = (iconv_ibp)in;
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326
327 while (1) {
328 size_t cnt = iconv(conv, &cp, &insz, &outpos, &outsz);
329
330 if (cnt == -1) {
331 size_t sofar;
332 if (errno != E2BIG) {
333 free(out);
334 iconv_close(conv);
335 return NULL;
336 }
337 /* insz has remaining number of bytes.
338 * since we started outsz the same as insz,
339 * it is likely that insz is not enough for
340 * converting the rest.
341 */
342 sofar = outpos - out;
343 outalloc = sofar + insz * 2 + 32;
344 out = xrealloc(out, outalloc);
345 outpos = out + sofar;
346 outsz = outalloc - sofar - 1;
347 }
348 else {
349 *outpos = '\0';
350 break;
351 }
352 }
353 iconv_close(conv);
354 return out;
355 }
356 #endif
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