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9e832665 JS |
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 | ||
6 | struct interval { | |
7 | int first; | |
8 | int last; | |
9 | }; | |
10 | ||
11 | /* auxiliary function for binary search in interval table */ | |
f3fa1838 JH |
12 | static int bisearch(ucs_char_t ucs, const struct interval *table, int max) |
13 | { | |
9e832665 JS |
14 | int min = 0; |
15 | int mid; | |
16 | ||
17 | if (ucs < table[0].first || ucs > table[max].last) | |
18 | return 0; | |
19 | while (max >= min) { | |
20 | mid = (min + max) / 2; | |
21 | if (ucs > table[mid].last) | |
22 | min = mid + 1; | |
23 | else if (ucs < table[mid].first) | |
24 | max = mid - 1; | |
25 | else | |
26 | return 1; | |
27 | } | |
28 | ||
29 | return 0; | |
30 | } | |
31 | ||
32 | /* The following two functions define the column width of an ISO 10646 | |
33 | * character as follows: | |
34 | * | |
35 | * - The null character (U+0000) has a column width of 0. | |
36 | * | |
37 | * - Other C0/C1 control characters and DEL will lead to a return | |
38 | * value of -1. | |
39 | * | |
40 | * - Non-spacing and enclosing combining characters (general | |
41 | * category code Mn or Me in the Unicode database) have a | |
42 | * column width of 0. | |
43 | * | |
44 | * - SOFT HYPHEN (U+00AD) has a column width of 1. | |
45 | * | |
46 | * - Other format characters (general category code Cf in the Unicode | |
47 | * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0. | |
48 | * | |
49 | * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF) | |
50 | * have a column width of 0. | |
51 | * | |
52 | * - Spacing characters in the East Asian Wide (W) or East Asian | |
53 | * Full-width (F) category as defined in Unicode Technical | |
54 | * Report #11 have a column width of 2. | |
55 | * | |
56 | * - All remaining characters (including all printable | |
57 | * ISO 8859-1 and WGL4 characters, Unicode control characters, | |
58 | * etc.) have a column width of 1. | |
59 | * | |
28321145 | 60 | * This implementation assumes that ucs_char_t characters are encoded |
9e832665 JS |
61 | * in ISO 10646. |
62 | */ | |
63 | ||
b51be13c | 64 | static int git_wcwidth(ucs_char_t ch) |
9e832665 JS |
65 | { |
66 | /* | |
67 | * Sorted list of non-overlapping intervals of non-spacing characters, | |
68 | * generated by | |
69 | * "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c". | |
70 | */ | |
71 | static const struct interval combining[] = { | |
72 | { 0x0300, 0x0357 }, { 0x035D, 0x036F }, { 0x0483, 0x0486 }, | |
73 | { 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 }, | |
74 | { 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 }, | |
75 | { 0x05C4, 0x05C4 }, { 0x0600, 0x0603 }, { 0x0610, 0x0615 }, | |
76 | { 0x064B, 0x0658 }, { 0x0670, 0x0670 }, { 0x06D6, 0x06E4 }, | |
77 | { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED }, { 0x070F, 0x070F }, | |
78 | { 0x0711, 0x0711 }, { 0x0730, 0x074A }, { 0x07A6, 0x07B0 }, | |
79 | { 0x0901, 0x0902 }, { 0x093C, 0x093C }, { 0x0941, 0x0948 }, | |
80 | { 0x094D, 0x094D }, { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, | |
81 | { 0x0981, 0x0981 }, { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, | |
82 | { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, | |
83 | { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, | |
84 | { 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, | |
85 | { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, | |
86 | { 0x0ACD, 0x0ACD }, { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, | |
87 | { 0x0B3C, 0x0B3C }, { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, | |
88 | { 0x0B4D, 0x0B4D }, { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, | |
89 | { 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, | |
90 | { 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, | |
91 | { 0x0CBC, 0x0CBC }, { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, | |
92 | { 0x0CCC, 0x0CCD }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D }, | |
93 | { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 }, | |
94 | { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E }, | |
95 | { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC }, | |
96 | { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 }, | |
97 | { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E }, | |
98 | { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 }, | |
99 | { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 }, | |
100 | { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 }, | |
101 | { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x1712, 0x1714 }, | |
102 | { 0x1732, 0x1734 }, { 0x1752, 0x1753 }, { 0x1772, 0x1773 }, | |
103 | { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD }, { 0x17C6, 0x17C6 }, | |
104 | { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD }, { 0x180B, 0x180D }, | |
105 | { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 }, { 0x1927, 0x1928 }, | |
106 | { 0x1932, 0x1932 }, { 0x1939, 0x193B }, { 0x200B, 0x200F }, | |
107 | { 0x202A, 0x202E }, { 0x2060, 0x2063 }, { 0x206A, 0x206F }, | |
108 | { 0x20D0, 0x20EA }, { 0x302A, 0x302F }, { 0x3099, 0x309A }, | |
109 | { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F }, { 0xFE20, 0xFE23 }, | |
110 | { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB }, { 0x1D167, 0x1D169 }, | |
111 | { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, | |
112 | { 0x1D1AA, 0x1D1AD }, { 0xE0001, 0xE0001 }, | |
113 | { 0xE0020, 0xE007F }, { 0xE0100, 0xE01EF } | |
114 | }; | |
115 | ||
116 | /* test for 8-bit control characters */ | |
117 | if (ch == 0) | |
118 | return 0; | |
119 | if (ch < 32 || (ch >= 0x7f && ch < 0xa0)) | |
120 | return -1; | |
121 | ||
122 | /* binary search in table of non-spacing characters */ | |
123 | if (bisearch(ch, combining, sizeof(combining) | |
124 | / sizeof(struct interval) - 1)) | |
125 | return 0; | |
126 | ||
127 | /* | |
128 | * If we arrive here, ch is neither a combining nor a C0/C1 | |
129 | * control character. | |
130 | */ | |
131 | ||
132 | return 1 + | |
133 | (ch >= 0x1100 && | |
134 | /* Hangul Jamo init. consonants */ | |
135 | (ch <= 0x115f || | |
136 | ch == 0x2329 || ch == 0x232a || | |
137 | /* CJK ... Yi */ | |
138 | (ch >= 0x2e80 && ch <= 0xa4cf && | |
139 | ch != 0x303f) || | |
140 | /* Hangul Syllables */ | |
141 | (ch >= 0xac00 && ch <= 0xd7a3) || | |
142 | /* CJK Compatibility Ideographs */ | |
143 | (ch >= 0xf900 && ch <= 0xfaff) || | |
144 | /* CJK Compatibility Forms */ | |
145 | (ch >= 0xfe30 && ch <= 0xfe6f) || | |
146 | /* Fullwidth Forms */ | |
147 | (ch >= 0xff00 && ch <= 0xff60) || | |
148 | (ch >= 0xffe0 && ch <= 0xffe6) || | |
149 | (ch >= 0x20000 && ch <= 0x2fffd) || | |
150 | (ch >= 0x30000 && ch <= 0x3fffd))); | |
151 | } | |
152 | ||
153 | /* | |
396ccf1f JH |
154 | * Pick one ucs character starting from the location *start points at, |
155 | * and return it, while updating the *start pointer to point at the | |
44b25b87 JH |
156 | * end of that character. When remainder_p is not NULL, the location |
157 | * holds the number of bytes remaining in the string that we are allowed | |
158 | * to pick from. Otherwise we are allowed to pick up to the NUL that | |
159 | * would eventually appear in the string. *remainder_p is also reduced | |
160 | * by the number of bytes we have consumed. | |
396ccf1f JH |
161 | * |
162 | * If the string was not a valid UTF-8, *start pointer is set to NULL | |
163 | * and the return value is undefined. | |
9e832665 | 164 | */ |
44b25b87 | 165 | ucs_char_t pick_one_utf8_char(const char **start, size_t *remainder_p) |
9e832665 JS |
166 | { |
167 | unsigned char *s = (unsigned char *)*start; | |
28321145 | 168 | ucs_char_t ch; |
44b25b87 | 169 | size_t remainder, incr; |
9e832665 | 170 | |
44b25b87 JH |
171 | /* |
172 | * A caller that assumes NUL terminated text can choose | |
173 | * not to bother with the remainder length. We will | |
174 | * stop at the first NUL. | |
175 | */ | |
176 | remainder = (remainder_p ? *remainder_p : 999); | |
177 | ||
178 | if (remainder < 1) { | |
179 | goto invalid; | |
180 | } else if (*s < 0x80) { | |
9e832665 JS |
181 | /* 0xxxxxxx */ |
182 | ch = *s; | |
44b25b87 | 183 | incr = 1; |
9e832665 JS |
184 | } else if ((s[0] & 0xe0) == 0xc0) { |
185 | /* 110XXXXx 10xxxxxx */ | |
44b25b87 JH |
186 | if (remainder < 2 || |
187 | (s[1] & 0xc0) != 0x80 || | |
188 | (s[0] & 0xfe) == 0xc0) | |
9e832665 JS |
189 | goto invalid; |
190 | ch = ((s[0] & 0x1f) << 6) | (s[1] & 0x3f); | |
44b25b87 | 191 | incr = 2; |
9e832665 JS |
192 | } else if ((s[0] & 0xf0) == 0xe0) { |
193 | /* 1110XXXX 10Xxxxxx 10xxxxxx */ | |
44b25b87 JH |
194 | if (remainder < 3 || |
195 | (s[1] & 0xc0) != 0x80 || | |
196 | (s[2] & 0xc0) != 0x80 || | |
197 | /* overlong? */ | |
198 | (s[0] == 0xe0 && (s[1] & 0xe0) == 0x80) || | |
199 | /* surrogate? */ | |
200 | (s[0] == 0xed && (s[1] & 0xe0) == 0xa0) || | |
201 | /* U+FFFE or U+FFFF? */ | |
202 | (s[0] == 0xef && s[1] == 0xbf && | |
203 | (s[2] & 0xfe) == 0xbe)) | |
9e832665 JS |
204 | goto invalid; |
205 | ch = ((s[0] & 0x0f) << 12) | | |
206 | ((s[1] & 0x3f) << 6) | (s[2] & 0x3f); | |
44b25b87 | 207 | incr = 3; |
9e832665 JS |
208 | } else if ((s[0] & 0xf8) == 0xf0) { |
209 | /* 11110XXX 10XXxxxx 10xxxxxx 10xxxxxx */ | |
44b25b87 JH |
210 | if (remainder < 4 || |
211 | (s[1] & 0xc0) != 0x80 || | |
212 | (s[2] & 0xc0) != 0x80 || | |
213 | (s[3] & 0xc0) != 0x80 || | |
214 | /* overlong? */ | |
215 | (s[0] == 0xf0 && (s[1] & 0xf0) == 0x80) || | |
216 | /* > U+10FFFF? */ | |
217 | (s[0] == 0xf4 && s[1] > 0x8f) || s[0] > 0xf4) | |
9e832665 JS |
218 | goto invalid; |
219 | ch = ((s[0] & 0x07) << 18) | ((s[1] & 0x3f) << 12) | | |
220 | ((s[2] & 0x3f) << 6) | (s[3] & 0x3f); | |
44b25b87 | 221 | incr = 4; |
9e832665 JS |
222 | } else { |
223 | invalid: | |
224 | *start = NULL; | |
225 | return 0; | |
226 | } | |
227 | ||
44b25b87 JH |
228 | *start += incr; |
229 | if (remainder_p) | |
230 | *remainder_p = remainder - incr; | |
396ccf1f JH |
231 | return ch; |
232 | } | |
233 | ||
234 | /* | |
235 | * This function returns the number of columns occupied by the character | |
236 | * pointed to by the variable start. The pointer is updated to point at | |
44b25b87 JH |
237 | * the next character. When remainder_p is not NULL, it points at the |
238 | * location that stores the number of remaining bytes we can use to pick | |
239 | * a character (see pick_one_utf8_char() above). | |
396ccf1f | 240 | */ |
44b25b87 | 241 | int utf8_width(const char **start, size_t *remainder_p) |
396ccf1f | 242 | { |
44b25b87 | 243 | ucs_char_t ch = pick_one_utf8_char(start, remainder_p); |
396ccf1f JH |
244 | if (!*start) |
245 | return 0; | |
b51be13c | 246 | return git_wcwidth(ch); |
9e832665 JS |
247 | } |
248 | ||
249 | int is_utf8(const char *text) | |
250 | { | |
251 | while (*text) { | |
252 | if (*text == '\n' || *text == '\t' || *text == '\r') { | |
253 | text++; | |
254 | continue; | |
255 | } | |
44b25b87 | 256 | utf8_width(&text, NULL); |
9e832665 JS |
257 | if (!text) |
258 | return 0; | |
259 | } | |
260 | return 1; | |
261 | } | |
262 | ||
263 | static void print_spaces(int count) | |
264 | { | |
265 | static const char s[] = " "; | |
266 | while (count >= sizeof(s)) { | |
267 | fwrite(s, sizeof(s) - 1, 1, stdout); | |
268 | count -= sizeof(s) - 1; | |
269 | } | |
270 | fwrite(s, count, 1, stdout); | |
271 | } | |
272 | ||
273 | /* | |
274 | * Wrap the text, if necessary. The variable indent is the indent for the | |
275 | * first line, indent2 is the indent for all other lines. | |
094e03b0 JS |
276 | * If indent is negative, assume that already -indent columns have been |
277 | * consumed (and no extra indent is necessary for the first line). | |
9e832665 | 278 | */ |
094e03b0 | 279 | int print_wrapped_text(const char *text, int indent, int indent2, int width) |
9e832665 JS |
280 | { |
281 | int w = indent, assume_utf8 = is_utf8(text); | |
282 | const char *bol = text, *space = NULL; | |
283 | ||
094e03b0 JS |
284 | if (indent < 0) { |
285 | w = -indent; | |
286 | space = text; | |
287 | } | |
288 | ||
9e832665 JS |
289 | for (;;) { |
290 | char c = *text; | |
291 | if (!c || isspace(c)) { | |
292 | if (w < width || !space) { | |
293 | const char *start = bol; | |
294 | if (space) | |
295 | start = space; | |
296 | else | |
297 | print_spaces(indent); | |
298 | fwrite(start, text - start, 1, stdout); | |
094e03b0 JS |
299 | if (!c) |
300 | return w; | |
301 | else if (c == '\t') | |
9e832665 JS |
302 | w |= 0x07; |
303 | space = text; | |
304 | w++; | |
305 | text++; | |
306 | } | |
307 | else { | |
308 | putchar('\n'); | |
62273826 | 309 | text = bol = space + isspace(*space); |
9e832665 JS |
310 | space = NULL; |
311 | w = indent = indent2; | |
312 | } | |
313 | continue; | |
314 | } | |
315 | if (assume_utf8) | |
44b25b87 | 316 | w += utf8_width(&text, NULL); |
9e832665 JS |
317 | else { |
318 | w++; | |
319 | text++; | |
320 | } | |
321 | } | |
322 | } | |
b45974a6 | 323 | |
677cfed5 JH |
324 | int is_encoding_utf8(const char *name) |
325 | { | |
326 | if (!name) | |
327 | return 1; | |
328 | if (!strcasecmp(name, "utf-8") || !strcasecmp(name, "utf8")) | |
329 | return 1; | |
330 | return 0; | |
331 | } | |
332 | ||
b45974a6 JH |
333 | /* |
334 | * Given a buffer and its encoding, return it re-encoded | |
335 | * with iconv. If the conversion fails, returns NULL. | |
336 | */ | |
337 | #ifndef NO_ICONV | |
fd547a97 RJ |
338 | #ifdef OLD_ICONV |
339 | typedef const char * iconv_ibp; | |
340 | #else | |
341 | typedef char * iconv_ibp; | |
342 | #endif | |
b45974a6 JH |
343 | char *reencode_string(const char *in, const char *out_encoding, const char *in_encoding) |
344 | { | |
345 | iconv_t conv; | |
346 | size_t insz, outsz, outalloc; | |
fd547a97 RJ |
347 | char *out, *outpos; |
348 | iconv_ibp cp; | |
b45974a6 JH |
349 | |
350 | if (!in_encoding) | |
351 | return NULL; | |
352 | conv = iconv_open(out_encoding, in_encoding); | |
353 | if (conv == (iconv_t) -1) | |
354 | return NULL; | |
355 | insz = strlen(in); | |
356 | outsz = insz; | |
357 | outalloc = outsz + 1; /* for terminating NUL */ | |
358 | out = xmalloc(outalloc); | |
359 | outpos = out; | |
fd547a97 | 360 | cp = (iconv_ibp)in; |
b45974a6 JH |
361 | |
362 | while (1) { | |
363 | size_t cnt = iconv(conv, &cp, &insz, &outpos, &outsz); | |
364 | ||
365 | if (cnt == -1) { | |
366 | size_t sofar; | |
367 | if (errno != E2BIG) { | |
368 | free(out); | |
369 | iconv_close(conv); | |
370 | return NULL; | |
371 | } | |
372 | /* insz has remaining number of bytes. | |
373 | * since we started outsz the same as insz, | |
374 | * it is likely that insz is not enough for | |
375 | * converting the rest. | |
376 | */ | |
377 | sofar = outpos - out; | |
378 | outalloc = sofar + insz * 2 + 32; | |
379 | out = xrealloc(out, outalloc); | |
380 | outpos = out + sofar; | |
381 | outsz = outalloc - sofar - 1; | |
382 | } | |
383 | else { | |
384 | *outpos = '\0'; | |
385 | break; | |
386 | } | |
387 | } | |
388 | iconv_close(conv); | |
389 | return out; | |
390 | } | |
391 | #endif |