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9e832665 | 1 | #include "git-compat-util.h" |
a94410c8 | 2 | #include "strbuf.h" |
9e832665 JS |
3 | #include "utf8.h" |
4 | ||
5 | /* This code is originally from http://www.cl.cam.ac.uk/~mgk25/ucs/ */ | |
6 | ||
7 | struct interval { | |
8 | int first; | |
9 | int last; | |
10 | }; | |
11 | ||
12 | /* auxiliary function for binary search in interval table */ | |
f3fa1838 JH |
13 | static int bisearch(ucs_char_t ucs, const struct interval *table, int max) |
14 | { | |
9e832665 JS |
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 | * | |
28321145 | 61 | * This implementation assumes that ucs_char_t characters are encoded |
9e832665 JS |
62 | * in ISO 10646. |
63 | */ | |
64 | ||
b51be13c | 65 | static int git_wcwidth(ucs_char_t ch) |
9e832665 JS |
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 | /* | |
396ccf1f JH |
155 | * Pick one ucs character starting from the location *start points at, |
156 | * and return it, while updating the *start pointer to point at the | |
44b25b87 JH |
157 | * end of that character. When remainder_p is not NULL, the location |
158 | * holds the number of bytes remaining in the string that we are allowed | |
159 | * to pick from. Otherwise we are allowed to pick up to the NUL that | |
160 | * would eventually appear in the string. *remainder_p is also reduced | |
161 | * by the number of bytes we have consumed. | |
396ccf1f JH |
162 | * |
163 | * If the string was not a valid UTF-8, *start pointer is set to NULL | |
164 | * and the return value is undefined. | |
9e832665 | 165 | */ |
44b25b87 | 166 | ucs_char_t pick_one_utf8_char(const char **start, size_t *remainder_p) |
9e832665 JS |
167 | { |
168 | unsigned char *s = (unsigned char *)*start; | |
28321145 | 169 | ucs_char_t ch; |
44b25b87 | 170 | size_t remainder, incr; |
9e832665 | 171 | |
44b25b87 JH |
172 | /* |
173 | * A caller that assumes NUL terminated text can choose | |
174 | * not to bother with the remainder length. We will | |
175 | * stop at the first NUL. | |
176 | */ | |
177 | remainder = (remainder_p ? *remainder_p : 999); | |
178 | ||
179 | if (remainder < 1) { | |
180 | goto invalid; | |
181 | } else if (*s < 0x80) { | |
9e832665 JS |
182 | /* 0xxxxxxx */ |
183 | ch = *s; | |
44b25b87 | 184 | incr = 1; |
9e832665 JS |
185 | } else if ((s[0] & 0xe0) == 0xc0) { |
186 | /* 110XXXXx 10xxxxxx */ | |
44b25b87 JH |
187 | if (remainder < 2 || |
188 | (s[1] & 0xc0) != 0x80 || | |
189 | (s[0] & 0xfe) == 0xc0) | |
9e832665 JS |
190 | goto invalid; |
191 | ch = ((s[0] & 0x1f) << 6) | (s[1] & 0x3f); | |
44b25b87 | 192 | incr = 2; |
9e832665 JS |
193 | } else if ((s[0] & 0xf0) == 0xe0) { |
194 | /* 1110XXXX 10Xxxxxx 10xxxxxx */ | |
44b25b87 JH |
195 | if (remainder < 3 || |
196 | (s[1] & 0xc0) != 0x80 || | |
197 | (s[2] & 0xc0) != 0x80 || | |
198 | /* overlong? */ | |
199 | (s[0] == 0xe0 && (s[1] & 0xe0) == 0x80) || | |
200 | /* surrogate? */ | |
201 | (s[0] == 0xed && (s[1] & 0xe0) == 0xa0) || | |
202 | /* U+FFFE or U+FFFF? */ | |
203 | (s[0] == 0xef && s[1] == 0xbf && | |
204 | (s[2] & 0xfe) == 0xbe)) | |
9e832665 JS |
205 | goto invalid; |
206 | ch = ((s[0] & 0x0f) << 12) | | |
207 | ((s[1] & 0x3f) << 6) | (s[2] & 0x3f); | |
44b25b87 | 208 | incr = 3; |
9e832665 JS |
209 | } else if ((s[0] & 0xf8) == 0xf0) { |
210 | /* 11110XXX 10XXxxxx 10xxxxxx 10xxxxxx */ | |
44b25b87 JH |
211 | if (remainder < 4 || |
212 | (s[1] & 0xc0) != 0x80 || | |
213 | (s[2] & 0xc0) != 0x80 || | |
214 | (s[3] & 0xc0) != 0x80 || | |
215 | /* overlong? */ | |
216 | (s[0] == 0xf0 && (s[1] & 0xf0) == 0x80) || | |
217 | /* > U+10FFFF? */ | |
218 | (s[0] == 0xf4 && s[1] > 0x8f) || s[0] > 0xf4) | |
9e832665 JS |
219 | goto invalid; |
220 | ch = ((s[0] & 0x07) << 18) | ((s[1] & 0x3f) << 12) | | |
221 | ((s[2] & 0x3f) << 6) | (s[3] & 0x3f); | |
44b25b87 | 222 | incr = 4; |
9e832665 JS |
223 | } else { |
224 | invalid: | |
225 | *start = NULL; | |
226 | return 0; | |
227 | } | |
228 | ||
44b25b87 JH |
229 | *start += incr; |
230 | if (remainder_p) | |
231 | *remainder_p = remainder - incr; | |
396ccf1f JH |
232 | return ch; |
233 | } | |
234 | ||
235 | /* | |
236 | * This function returns the number of columns occupied by the character | |
237 | * pointed to by the variable start. The pointer is updated to point at | |
44b25b87 JH |
238 | * the next character. When remainder_p is not NULL, it points at the |
239 | * location that stores the number of remaining bytes we can use to pick | |
240 | * a character (see pick_one_utf8_char() above). | |
396ccf1f | 241 | */ |
44b25b87 | 242 | int utf8_width(const char **start, size_t *remainder_p) |
396ccf1f | 243 | { |
44b25b87 | 244 | ucs_char_t ch = pick_one_utf8_char(start, remainder_p); |
396ccf1f JH |
245 | if (!*start) |
246 | return 0; | |
b51be13c | 247 | return git_wcwidth(ch); |
9e832665 JS |
248 | } |
249 | ||
8a9391e9 GT |
250 | /* |
251 | * Returns the total number of columns required by a null-terminated | |
252 | * string, assuming that the string is utf8. Returns strlen() instead | |
253 | * if the string does not look like a valid utf8 string. | |
254 | */ | |
255 | int utf8_strwidth(const char *string) | |
256 | { | |
257 | int width = 0; | |
258 | const char *orig = string; | |
259 | ||
260 | while (1) { | |
261 | if (!string) | |
262 | return strlen(orig); | |
263 | if (!*string) | |
264 | return width; | |
265 | width += utf8_width(&string, NULL); | |
266 | } | |
267 | } | |
268 | ||
9e832665 JS |
269 | int is_utf8(const char *text) |
270 | { | |
271 | while (*text) { | |
272 | if (*text == '\n' || *text == '\t' || *text == '\r') { | |
273 | text++; | |
274 | continue; | |
275 | } | |
44b25b87 | 276 | utf8_width(&text, NULL); |
9e832665 JS |
277 | if (!text) |
278 | return 0; | |
279 | } | |
280 | return 1; | |
281 | } | |
282 | ||
a94410c8 JS |
283 | static inline void strbuf_write(struct strbuf *sb, const char *buf, int len) |
284 | { | |
285 | if (sb) | |
286 | strbuf_insert(sb, sb->len, buf, len); | |
287 | else | |
288 | fwrite(buf, len, 1, stdout); | |
289 | } | |
290 | ||
291 | static void print_spaces(struct strbuf *buf, int count) | |
9e832665 JS |
292 | { |
293 | static const char s[] = " "; | |
294 | while (count >= sizeof(s)) { | |
a94410c8 | 295 | strbuf_write(buf, s, sizeof(s) - 1); |
9e832665 JS |
296 | count -= sizeof(s) - 1; |
297 | } | |
a94410c8 | 298 | strbuf_write(buf, s, count); |
9e832665 JS |
299 | } |
300 | ||
37bb5d74 RS |
301 | static void strbuf_add_indented_text(struct strbuf *buf, const char *text, |
302 | int indent, int indent2) | |
303 | { | |
304 | if (indent < 0) | |
305 | indent = 0; | |
306 | while (*text) { | |
307 | const char *eol = strchrnul(text, '\n'); | |
308 | if (*eol == '\n') | |
309 | eol++; | |
310 | print_spaces(buf, indent); | |
311 | strbuf_write(buf, text, eol - text); | |
312 | text = eol; | |
313 | indent = indent2; | |
314 | } | |
315 | } | |
316 | ||
8a3c63e0 RS |
317 | static size_t display_mode_esc_sequence_len(const char *s) |
318 | { | |
319 | const char *p = s; | |
320 | if (*p++ != '\033') | |
321 | return 0; | |
322 | if (*p++ != '[') | |
323 | return 0; | |
324 | while (isdigit(*p) || *p == ';') | |
325 | p++; | |
326 | if (*p++ != 'm') | |
327 | return 0; | |
328 | return p - s; | |
329 | } | |
330 | ||
9e832665 JS |
331 | /* |
332 | * Wrap the text, if necessary. The variable indent is the indent for the | |
333 | * first line, indent2 is the indent for all other lines. | |
094e03b0 JS |
334 | * If indent is negative, assume that already -indent columns have been |
335 | * consumed (and no extra indent is necessary for the first line). | |
9e832665 | 336 | */ |
a94410c8 JS |
337 | int strbuf_add_wrapped_text(struct strbuf *buf, |
338 | const char *text, int indent, int indent2, int width) | |
9e832665 JS |
339 | { |
340 | int w = indent, assume_utf8 = is_utf8(text); | |
341 | const char *bol = text, *space = NULL; | |
342 | ||
00d39473 | 343 | if (width <= 0) { |
37bb5d74 | 344 | strbuf_add_indented_text(buf, text, indent, indent2); |
00d39473 JH |
345 | return 1; |
346 | } | |
347 | ||
094e03b0 JS |
348 | if (indent < 0) { |
349 | w = -indent; | |
350 | space = text; | |
351 | } | |
352 | ||
9e832665 | 353 | for (;;) { |
8a3c63e0 RS |
354 | char c; |
355 | size_t skip; | |
356 | ||
357 | while ((skip = display_mode_esc_sequence_len(text))) | |
358 | text += skip; | |
359 | ||
360 | c = *text; | |
9e832665 JS |
361 | if (!c || isspace(c)) { |
362 | if (w < width || !space) { | |
363 | const char *start = bol; | |
ae0b2702 JS |
364 | if (!c && text == start) |
365 | return w; | |
9e832665 JS |
366 | if (space) |
367 | start = space; | |
368 | else | |
a94410c8 JS |
369 | print_spaces(buf, indent); |
370 | strbuf_write(buf, start, text - start); | |
094e03b0 JS |
371 | if (!c) |
372 | return w; | |
9e832665 | 373 | space = text; |
ae0b2702 JS |
374 | if (c == '\t') |
375 | w |= 0x07; | |
376 | else if (c == '\n') { | |
377 | space++; | |
378 | if (*space == '\n') { | |
a94410c8 | 379 | strbuf_write(buf, "\n", 1); |
ae0b2702 JS |
380 | goto new_line; |
381 | } | |
382 | else if (!isalnum(*space)) | |
383 | goto new_line; | |
384 | else | |
a94410c8 | 385 | strbuf_write(buf, " ", 1); |
ae0b2702 | 386 | } |
9e832665 JS |
387 | w++; |
388 | text++; | |
389 | } | |
390 | else { | |
ae0b2702 | 391 | new_line: |
a94410c8 | 392 | strbuf_write(buf, "\n", 1); |
62273826 | 393 | text = bol = space + isspace(*space); |
9e832665 JS |
394 | space = NULL; |
395 | w = indent = indent2; | |
396 | } | |
397 | continue; | |
398 | } | |
399 | if (assume_utf8) | |
44b25b87 | 400 | w += utf8_width(&text, NULL); |
9e832665 JS |
401 | else { |
402 | w++; | |
403 | text++; | |
404 | } | |
405 | } | |
406 | } | |
b45974a6 | 407 | |
a94410c8 JS |
408 | int print_wrapped_text(const char *text, int indent, int indent2, int width) |
409 | { | |
410 | return strbuf_add_wrapped_text(NULL, text, indent, indent2, width); | |
411 | } | |
412 | ||
677cfed5 JH |
413 | int is_encoding_utf8(const char *name) |
414 | { | |
415 | if (!name) | |
416 | return 1; | |
417 | if (!strcasecmp(name, "utf-8") || !strcasecmp(name, "utf8")) | |
418 | return 1; | |
419 | return 0; | |
420 | } | |
421 | ||
b45974a6 JH |
422 | /* |
423 | * Given a buffer and its encoding, return it re-encoded | |
424 | * with iconv. If the conversion fails, returns NULL. | |
425 | */ | |
426 | #ifndef NO_ICONV | |
309dbc82 | 427 | #if defined(OLD_ICONV) || (defined(__sun__) && !defined(_XPG6)) |
fd547a97 RJ |
428 | typedef const char * iconv_ibp; |
429 | #else | |
430 | typedef char * iconv_ibp; | |
431 | #endif | |
b45974a6 JH |
432 | char *reencode_string(const char *in, const char *out_encoding, const char *in_encoding) |
433 | { | |
434 | iconv_t conv; | |
435 | size_t insz, outsz, outalloc; | |
fd547a97 RJ |
436 | char *out, *outpos; |
437 | iconv_ibp cp; | |
b45974a6 JH |
438 | |
439 | if (!in_encoding) | |
440 | return NULL; | |
441 | conv = iconv_open(out_encoding, in_encoding); | |
442 | if (conv == (iconv_t) -1) | |
443 | return NULL; | |
444 | insz = strlen(in); | |
445 | outsz = insz; | |
446 | outalloc = outsz + 1; /* for terminating NUL */ | |
447 | out = xmalloc(outalloc); | |
448 | outpos = out; | |
fd547a97 | 449 | cp = (iconv_ibp)in; |
b45974a6 JH |
450 | |
451 | while (1) { | |
452 | size_t cnt = iconv(conv, &cp, &insz, &outpos, &outsz); | |
453 | ||
454 | if (cnt == -1) { | |
455 | size_t sofar; | |
456 | if (errno != E2BIG) { | |
457 | free(out); | |
458 | iconv_close(conv); | |
459 | return NULL; | |
460 | } | |
461 | /* insz has remaining number of bytes. | |
462 | * since we started outsz the same as insz, | |
463 | * it is likely that insz is not enough for | |
464 | * converting the rest. | |
465 | */ | |
466 | sofar = outpos - out; | |
467 | outalloc = sofar + insz * 2 + 32; | |
468 | out = xrealloc(out, outalloc); | |
469 | outpos = out + sofar; | |
470 | outsz = outalloc - sofar - 1; | |
471 | } | |
472 | else { | |
473 | *outpos = '\0'; | |
474 | break; | |
475 | } | |
476 | } | |
477 | iconv_close(conv); | |
478 | return out; | |
479 | } | |
480 | #endif |