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1 | #include "git-compat-util.h" | |
2 | #include "strbuf.h" | |
3 | #include "utf8.h" | |
4 | ||
5 | /* This code is originally from http://www.cl.cam.ac.uk/~mgk25/ucs/ */ | |
6 | ||
7 | static const char utf16_be_bom[] = {'\xFE', '\xFF'}; | |
8 | static const char utf16_le_bom[] = {'\xFF', '\xFE'}; | |
9 | static const char utf32_be_bom[] = {'\0', '\0', '\xFE', '\xFF'}; | |
10 | static const char utf32_le_bom[] = {'\xFF', '\xFE', '\0', '\0'}; | |
11 | ||
12 | struct interval { | |
13 | ucs_char_t first; | |
14 | ucs_char_t last; | |
15 | }; | |
16 | ||
17 | size_t display_mode_esc_sequence_len(const char *s) | |
18 | { | |
19 | const char *p = s; | |
20 | if (*p++ != '\033') | |
21 | return 0; | |
22 | if (*p++ != '[') | |
23 | return 0; | |
24 | while (isdigit(*p) || *p == ';') | |
25 | p++; | |
26 | if (*p++ != 'm') | |
27 | return 0; | |
28 | return p - s; | |
29 | } | |
30 | ||
31 | /* auxiliary function for binary search in interval table */ | |
32 | static int bisearch(ucs_char_t ucs, const struct interval *table, int max) | |
33 | { | |
34 | int min = 0; | |
35 | int mid; | |
36 | ||
37 | if (ucs < table[0].first || ucs > table[max].last) | |
38 | return 0; | |
39 | while (max >= min) { | |
40 | mid = min + (max - min) / 2; | |
41 | if (ucs > table[mid].last) | |
42 | min = mid + 1; | |
43 | else if (ucs < table[mid].first) | |
44 | max = mid - 1; | |
45 | else | |
46 | return 1; | |
47 | } | |
48 | ||
49 | return 0; | |
50 | } | |
51 | ||
52 | /* The following two functions define the column width of an ISO 10646 | |
53 | * character as follows: | |
54 | * | |
55 | * - The null character (U+0000) has a column width of 0. | |
56 | * | |
57 | * - Other C0/C1 control characters and DEL will lead to a return | |
58 | * value of -1. | |
59 | * | |
60 | * - Non-spacing and enclosing combining characters (general | |
61 | * category code Mn or Me in the Unicode database) have a | |
62 | * column width of 0. | |
63 | * | |
64 | * - SOFT HYPHEN (U+00AD) has a column width of 1. | |
65 | * | |
66 | * - Other format characters (general category code Cf in the Unicode | |
67 | * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0. | |
68 | * | |
69 | * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF) | |
70 | * have a column width of 0. | |
71 | * | |
72 | * - Spacing characters in the East Asian Wide (W) or East Asian | |
73 | * Full-width (F) category as defined in Unicode Technical | |
74 | * Report #11 have a column width of 2. | |
75 | * | |
76 | * - All remaining characters (including all printable | |
77 | * ISO 8859-1 and WGL4 characters, Unicode control characters, | |
78 | * etc.) have a column width of 1. | |
79 | * | |
80 | * This implementation assumes that ucs_char_t characters are encoded | |
81 | * in ISO 10646. | |
82 | */ | |
83 | ||
84 | static int git_wcwidth(ucs_char_t ch) | |
85 | { | |
86 | /* | |
87 | * Sorted list of non-overlapping intervals of non-spacing characters, | |
88 | */ | |
89 | #include "unicode-width.h" | |
90 | ||
91 | /* test for 8-bit control characters */ | |
92 | if (ch == 0) | |
93 | return 0; | |
94 | if (ch < 32 || (ch >= 0x7f && ch < 0xa0)) | |
95 | return -1; | |
96 | ||
97 | /* binary search in table of non-spacing characters */ | |
98 | if (bisearch(ch, zero_width, ARRAY_SIZE(zero_width) - 1)) | |
99 | return 0; | |
100 | ||
101 | /* binary search in table of double width characters */ | |
102 | if (bisearch(ch, double_width, ARRAY_SIZE(double_width) - 1)) | |
103 | return 2; | |
104 | ||
105 | return 1; | |
106 | } | |
107 | ||
108 | /* | |
109 | * Pick one ucs character starting from the location *start points at, | |
110 | * and return it, while updating the *start pointer to point at the | |
111 | * end of that character. When remainder_p is not NULL, the location | |
112 | * holds the number of bytes remaining in the string that we are allowed | |
113 | * to pick from. Otherwise we are allowed to pick up to the NUL that | |
114 | * would eventually appear in the string. *remainder_p is also reduced | |
115 | * by the number of bytes we have consumed. | |
116 | * | |
117 | * If the string was not a valid UTF-8, *start pointer is set to NULL | |
118 | * and the return value is undefined. | |
119 | */ | |
120 | static ucs_char_t pick_one_utf8_char(const char **start, size_t *remainder_p) | |
121 | { | |
122 | unsigned char *s = (unsigned char *)*start; | |
123 | ucs_char_t ch; | |
124 | size_t remainder, incr; | |
125 | ||
126 | /* | |
127 | * A caller that assumes NUL terminated text can choose | |
128 | * not to bother with the remainder length. We will | |
129 | * stop at the first NUL. | |
130 | */ | |
131 | remainder = (remainder_p ? *remainder_p : 999); | |
132 | ||
133 | if (remainder < 1) { | |
134 | goto invalid; | |
135 | } else if (*s < 0x80) { | |
136 | /* 0xxxxxxx */ | |
137 | ch = *s; | |
138 | incr = 1; | |
139 | } else if ((s[0] & 0xe0) == 0xc0) { | |
140 | /* 110XXXXx 10xxxxxx */ | |
141 | if (remainder < 2 || | |
142 | (s[1] & 0xc0) != 0x80 || | |
143 | (s[0] & 0xfe) == 0xc0) | |
144 | goto invalid; | |
145 | ch = ((s[0] & 0x1f) << 6) | (s[1] & 0x3f); | |
146 | incr = 2; | |
147 | } else if ((s[0] & 0xf0) == 0xe0) { | |
148 | /* 1110XXXX 10Xxxxxx 10xxxxxx */ | |
149 | if (remainder < 3 || | |
150 | (s[1] & 0xc0) != 0x80 || | |
151 | (s[2] & 0xc0) != 0x80 || | |
152 | /* overlong? */ | |
153 | (s[0] == 0xe0 && (s[1] & 0xe0) == 0x80) || | |
154 | /* surrogate? */ | |
155 | (s[0] == 0xed && (s[1] & 0xe0) == 0xa0) || | |
156 | /* U+FFFE or U+FFFF? */ | |
157 | (s[0] == 0xef && s[1] == 0xbf && | |
158 | (s[2] & 0xfe) == 0xbe)) | |
159 | goto invalid; | |
160 | ch = ((s[0] & 0x0f) << 12) | | |
161 | ((s[1] & 0x3f) << 6) | (s[2] & 0x3f); | |
162 | incr = 3; | |
163 | } else if ((s[0] & 0xf8) == 0xf0) { | |
164 | /* 11110XXX 10XXxxxx 10xxxxxx 10xxxxxx */ | |
165 | if (remainder < 4 || | |
166 | (s[1] & 0xc0) != 0x80 || | |
167 | (s[2] & 0xc0) != 0x80 || | |
168 | (s[3] & 0xc0) != 0x80 || | |
169 | /* overlong? */ | |
170 | (s[0] == 0xf0 && (s[1] & 0xf0) == 0x80) || | |
171 | /* > U+10FFFF? */ | |
172 | (s[0] == 0xf4 && s[1] > 0x8f) || s[0] > 0xf4) | |
173 | goto invalid; | |
174 | ch = ((s[0] & 0x07) << 18) | ((s[1] & 0x3f) << 12) | | |
175 | ((s[2] & 0x3f) << 6) | (s[3] & 0x3f); | |
176 | incr = 4; | |
177 | } else { | |
178 | invalid: | |
179 | *start = NULL; | |
180 | return 0; | |
181 | } | |
182 | ||
183 | *start += incr; | |
184 | if (remainder_p) | |
185 | *remainder_p = remainder - incr; | |
186 | return ch; | |
187 | } | |
188 | ||
189 | /* | |
190 | * This function returns the number of columns occupied by the character | |
191 | * pointed to by the variable start. The pointer is updated to point at | |
192 | * the next character. When remainder_p is not NULL, it points at the | |
193 | * location that stores the number of remaining bytes we can use to pick | |
194 | * a character (see pick_one_utf8_char() above). | |
195 | */ | |
196 | int utf8_width(const char **start, size_t *remainder_p) | |
197 | { | |
198 | ucs_char_t ch = pick_one_utf8_char(start, remainder_p); | |
199 | if (!*start) | |
200 | return 0; | |
201 | return git_wcwidth(ch); | |
202 | } | |
203 | ||
204 | /* | |
205 | * Returns the total number of columns required by a null-terminated | |
206 | * string, assuming that the string is utf8. Returns strlen() instead | |
207 | * if the string does not look like a valid utf8 string. | |
208 | */ | |
209 | int utf8_strnwidth(const char *string, int len, int skip_ansi) | |
210 | { | |
211 | int width = 0; | |
212 | const char *orig = string; | |
213 | ||
214 | if (len == -1) | |
215 | len = strlen(string); | |
216 | while (string && string < orig + len) { | |
217 | int skip; | |
218 | while (skip_ansi && | |
219 | (skip = display_mode_esc_sequence_len(string)) != 0) | |
220 | string += skip; | |
221 | width += utf8_width(&string, NULL); | |
222 | } | |
223 | return string ? width : len; | |
224 | } | |
225 | ||
226 | int utf8_strwidth(const char *string) | |
227 | { | |
228 | return utf8_strnwidth(string, -1, 0); | |
229 | } | |
230 | ||
231 | int is_utf8(const char *text) | |
232 | { | |
233 | while (*text) { | |
234 | if (*text == '\n' || *text == '\t' || *text == '\r') { | |
235 | text++; | |
236 | continue; | |
237 | } | |
238 | utf8_width(&text, NULL); | |
239 | if (!text) | |
240 | return 0; | |
241 | } | |
242 | return 1; | |
243 | } | |
244 | ||
245 | static void strbuf_add_indented_text(struct strbuf *buf, const char *text, | |
246 | int indent, int indent2) | |
247 | { | |
248 | if (indent < 0) | |
249 | indent = 0; | |
250 | while (*text) { | |
251 | const char *eol = strchrnul(text, '\n'); | |
252 | if (*eol == '\n') | |
253 | eol++; | |
254 | strbuf_addchars(buf, ' ', indent); | |
255 | strbuf_add(buf, text, eol - text); | |
256 | text = eol; | |
257 | indent = indent2; | |
258 | } | |
259 | } | |
260 | ||
261 | /* | |
262 | * Wrap the text, if necessary. The variable indent is the indent for the | |
263 | * first line, indent2 is the indent for all other lines. | |
264 | * If indent is negative, assume that already -indent columns have been | |
265 | * consumed (and no extra indent is necessary for the first line). | |
266 | */ | |
267 | void strbuf_add_wrapped_text(struct strbuf *buf, | |
268 | const char *text, int indent1, int indent2, int width) | |
269 | { | |
270 | int indent, w, assume_utf8 = 1; | |
271 | const char *bol, *space, *start = text; | |
272 | size_t orig_len = buf->len; | |
273 | ||
274 | if (width <= 0) { | |
275 | strbuf_add_indented_text(buf, text, indent1, indent2); | |
276 | return; | |
277 | } | |
278 | ||
279 | retry: | |
280 | bol = text; | |
281 | w = indent = indent1; | |
282 | space = NULL; | |
283 | if (indent < 0) { | |
284 | w = -indent; | |
285 | space = text; | |
286 | } | |
287 | ||
288 | for (;;) { | |
289 | char c; | |
290 | size_t skip; | |
291 | ||
292 | while ((skip = display_mode_esc_sequence_len(text))) | |
293 | text += skip; | |
294 | ||
295 | c = *text; | |
296 | if (!c || isspace(c)) { | |
297 | if (w <= width || !space) { | |
298 | const char *start = bol; | |
299 | if (!c && text == start) | |
300 | return; | |
301 | if (space) | |
302 | start = space; | |
303 | else | |
304 | strbuf_addchars(buf, ' ', indent); | |
305 | strbuf_add(buf, start, text - start); | |
306 | if (!c) | |
307 | return; | |
308 | space = text; | |
309 | if (c == '\t') | |
310 | w |= 0x07; | |
311 | else if (c == '\n') { | |
312 | space++; | |
313 | if (*space == '\n') { | |
314 | strbuf_addch(buf, '\n'); | |
315 | goto new_line; | |
316 | } | |
317 | else if (!isalnum(*space)) | |
318 | goto new_line; | |
319 | else | |
320 | strbuf_addch(buf, ' '); | |
321 | } | |
322 | w++; | |
323 | text++; | |
324 | } | |
325 | else { | |
326 | new_line: | |
327 | strbuf_addch(buf, '\n'); | |
328 | text = bol = space + isspace(*space); | |
329 | space = NULL; | |
330 | w = indent = indent2; | |
331 | } | |
332 | continue; | |
333 | } | |
334 | if (assume_utf8) { | |
335 | w += utf8_width(&text, NULL); | |
336 | if (!text) { | |
337 | assume_utf8 = 0; | |
338 | text = start; | |
339 | strbuf_setlen(buf, orig_len); | |
340 | goto retry; | |
341 | } | |
342 | } else { | |
343 | w++; | |
344 | text++; | |
345 | } | |
346 | } | |
347 | } | |
348 | ||
349 | void strbuf_add_wrapped_bytes(struct strbuf *buf, const char *data, int len, | |
350 | int indent, int indent2, int width) | |
351 | { | |
352 | char *tmp = xstrndup(data, len); | |
353 | strbuf_add_wrapped_text(buf, tmp, indent, indent2, width); | |
354 | free(tmp); | |
355 | } | |
356 | ||
357 | void strbuf_utf8_replace(struct strbuf *sb_src, int pos, int width, | |
358 | const char *subst) | |
359 | { | |
360 | struct strbuf sb_dst = STRBUF_INIT; | |
361 | char *src = sb_src->buf; | |
362 | char *end = src + sb_src->len; | |
363 | char *dst; | |
364 | int w = 0, subst_len = 0; | |
365 | ||
366 | if (subst) | |
367 | subst_len = strlen(subst); | |
368 | strbuf_grow(&sb_dst, sb_src->len + subst_len); | |
369 | dst = sb_dst.buf; | |
370 | ||
371 | while (src < end) { | |
372 | char *old; | |
373 | size_t n; | |
374 | ||
375 | while ((n = display_mode_esc_sequence_len(src))) { | |
376 | memcpy(dst, src, n); | |
377 | src += n; | |
378 | dst += n; | |
379 | } | |
380 | ||
381 | if (src >= end) | |
382 | break; | |
383 | ||
384 | old = src; | |
385 | n = utf8_width((const char**)&src, NULL); | |
386 | if (!src) /* broken utf-8, do nothing */ | |
387 | goto out; | |
388 | if (n && w >= pos && w < pos + width) { | |
389 | if (subst) { | |
390 | memcpy(dst, subst, subst_len); | |
391 | dst += subst_len; | |
392 | subst = NULL; | |
393 | } | |
394 | w += n; | |
395 | continue; | |
396 | } | |
397 | memcpy(dst, old, src - old); | |
398 | dst += src - old; | |
399 | w += n; | |
400 | } | |
401 | strbuf_setlen(&sb_dst, dst - sb_dst.buf); | |
402 | strbuf_swap(sb_src, &sb_dst); | |
403 | out: | |
404 | strbuf_release(&sb_dst); | |
405 | } | |
406 | ||
407 | /* | |
408 | * Returns true (1) if the src encoding name matches the dst encoding | |
409 | * name directly or one of its alternative names. E.g. UTF-16BE is the | |
410 | * same as UTF16BE. | |
411 | */ | |
412 | static int same_utf_encoding(const char *src, const char *dst) | |
413 | { | |
414 | if (skip_iprefix(src, "utf", &src) && skip_iprefix(dst, "utf", &dst)) { | |
415 | skip_prefix(src, "-", &src); | |
416 | skip_prefix(dst, "-", &dst); | |
417 | return !strcasecmp(src, dst); | |
418 | } | |
419 | return 0; | |
420 | } | |
421 | ||
422 | int is_encoding_utf8(const char *name) | |
423 | { | |
424 | if (!name) | |
425 | return 1; | |
426 | if (same_utf_encoding("utf-8", name)) | |
427 | return 1; | |
428 | return 0; | |
429 | } | |
430 | ||
431 | int same_encoding(const char *src, const char *dst) | |
432 | { | |
433 | static const char utf8[] = "UTF-8"; | |
434 | ||
435 | if (!src) | |
436 | src = utf8; | |
437 | if (!dst) | |
438 | dst = utf8; | |
439 | if (same_utf_encoding(src, dst)) | |
440 | return 1; | |
441 | return !strcasecmp(src, dst); | |
442 | } | |
443 | ||
444 | /* | |
445 | * Wrapper for fprintf and returns the total number of columns required | |
446 | * for the printed string, assuming that the string is utf8. | |
447 | */ | |
448 | int utf8_fprintf(FILE *stream, const char *format, ...) | |
449 | { | |
450 | struct strbuf buf = STRBUF_INIT; | |
451 | va_list arg; | |
452 | int columns; | |
453 | ||
454 | va_start(arg, format); | |
455 | strbuf_vaddf(&buf, format, arg); | |
456 | va_end(arg); | |
457 | ||
458 | columns = fputs(buf.buf, stream); | |
459 | if (0 <= columns) /* keep the error from the I/O */ | |
460 | columns = utf8_strwidth(buf.buf); | |
461 | strbuf_release(&buf); | |
462 | return columns; | |
463 | } | |
464 | ||
465 | /* | |
466 | * Given a buffer and its encoding, return it re-encoded | |
467 | * with iconv. If the conversion fails, returns NULL. | |
468 | */ | |
469 | #ifndef NO_ICONV | |
470 | #if defined(OLD_ICONV) || (defined(__sun__) && !defined(_XPG6)) | |
471 | typedef const char * iconv_ibp; | |
472 | #else | |
473 | typedef char * iconv_ibp; | |
474 | #endif | |
475 | char *reencode_string_iconv(const char *in, size_t insz, iconv_t conv, | |
476 | size_t bom_len, size_t *outsz_p) | |
477 | { | |
478 | size_t outsz, outalloc; | |
479 | char *out, *outpos; | |
480 | iconv_ibp cp; | |
481 | ||
482 | outsz = insz; | |
483 | outalloc = st_add(outsz, 1 + bom_len); /* for terminating NUL */ | |
484 | out = xmalloc(outalloc); | |
485 | outpos = out + bom_len; | |
486 | cp = (iconv_ibp)in; | |
487 | ||
488 | while (1) { | |
489 | size_t cnt = iconv(conv, &cp, &insz, &outpos, &outsz); | |
490 | ||
491 | if (cnt == (size_t) -1) { | |
492 | size_t sofar; | |
493 | if (errno != E2BIG) { | |
494 | free(out); | |
495 | return NULL; | |
496 | } | |
497 | /* insz has remaining number of bytes. | |
498 | * since we started outsz the same as insz, | |
499 | * it is likely that insz is not enough for | |
500 | * converting the rest. | |
501 | */ | |
502 | sofar = outpos - out; | |
503 | outalloc = st_add3(sofar, st_mult(insz, 2), 32); | |
504 | out = xrealloc(out, outalloc); | |
505 | outpos = out + sofar; | |
506 | outsz = outalloc - sofar - 1; | |
507 | } | |
508 | else { | |
509 | *outpos = '\0'; | |
510 | if (outsz_p) | |
511 | *outsz_p = outpos - out; | |
512 | break; | |
513 | } | |
514 | } | |
515 | return out; | |
516 | } | |
517 | ||
518 | static const char *fallback_encoding(const char *name) | |
519 | { | |
520 | /* | |
521 | * Some platforms do not have the variously spelled variants of | |
522 | * UTF-8, so let's fall back to trying the most official | |
523 | * spelling. We do so only as a fallback in case the platform | |
524 | * does understand the user's spelling, but not our official | |
525 | * one. | |
526 | */ | |
527 | if (is_encoding_utf8(name)) | |
528 | return "UTF-8"; | |
529 | ||
530 | /* | |
531 | * Even though latin-1 is still seen in e-mail | |
532 | * headers, some platforms only install ISO-8859-1. | |
533 | */ | |
534 | if (!strcasecmp(name, "latin-1")) | |
535 | return "ISO-8859-1"; | |
536 | ||
537 | return name; | |
538 | } | |
539 | ||
540 | char *reencode_string_len(const char *in, size_t insz, | |
541 | const char *out_encoding, const char *in_encoding, | |
542 | size_t *outsz) | |
543 | { | |
544 | iconv_t conv; | |
545 | char *out; | |
546 | const char *bom_str = NULL; | |
547 | size_t bom_len = 0; | |
548 | ||
549 | if (!in_encoding) | |
550 | return NULL; | |
551 | ||
552 | /* UTF-16LE-BOM is the same as UTF-16 for reading */ | |
553 | if (same_utf_encoding("UTF-16LE-BOM", in_encoding)) | |
554 | in_encoding = "UTF-16"; | |
555 | ||
556 | /* | |
557 | * For writing, UTF-16 iconv typically creates "UTF-16BE-BOM" | |
558 | * Some users under Windows want the little endian version | |
559 | * | |
560 | * We handle UTF-16 and UTF-32 ourselves only if the platform does not | |
561 | * provide a BOM (which we require), since we want to match the behavior | |
562 | * of the system tools and libc as much as possible. | |
563 | */ | |
564 | if (same_utf_encoding("UTF-16LE-BOM", out_encoding)) { | |
565 | bom_str = utf16_le_bom; | |
566 | bom_len = sizeof(utf16_le_bom); | |
567 | out_encoding = "UTF-16LE"; | |
568 | } else if (same_utf_encoding("UTF-16BE-BOM", out_encoding)) { | |
569 | bom_str = utf16_be_bom; | |
570 | bom_len = sizeof(utf16_be_bom); | |
571 | out_encoding = "UTF-16BE"; | |
572 | #ifdef ICONV_OMITS_BOM | |
573 | } else if (same_utf_encoding("UTF-16", out_encoding)) { | |
574 | bom_str = utf16_be_bom; | |
575 | bom_len = sizeof(utf16_be_bom); | |
576 | out_encoding = "UTF-16BE"; | |
577 | } else if (same_utf_encoding("UTF-32", out_encoding)) { | |
578 | bom_str = utf32_be_bom; | |
579 | bom_len = sizeof(utf32_be_bom); | |
580 | out_encoding = "UTF-32BE"; | |
581 | #endif | |
582 | } | |
583 | ||
584 | conv = iconv_open(out_encoding, in_encoding); | |
585 | if (conv == (iconv_t) -1) { | |
586 | in_encoding = fallback_encoding(in_encoding); | |
587 | out_encoding = fallback_encoding(out_encoding); | |
588 | ||
589 | conv = iconv_open(out_encoding, in_encoding); | |
590 | if (conv == (iconv_t) -1) | |
591 | return NULL; | |
592 | } | |
593 | out = reencode_string_iconv(in, insz, conv, bom_len, outsz); | |
594 | iconv_close(conv); | |
595 | if (out && bom_str && bom_len) | |
596 | memcpy(out, bom_str, bom_len); | |
597 | return out; | |
598 | } | |
599 | #endif | |
600 | ||
601 | static int has_bom_prefix(const char *data, size_t len, | |
602 | const char *bom, size_t bom_len) | |
603 | { | |
604 | return data && bom && (len >= bom_len) && !memcmp(data, bom, bom_len); | |
605 | } | |
606 | ||
607 | int has_prohibited_utf_bom(const char *enc, const char *data, size_t len) | |
608 | { | |
609 | return ( | |
610 | (same_utf_encoding("UTF-16BE", enc) || | |
611 | same_utf_encoding("UTF-16LE", enc)) && | |
612 | (has_bom_prefix(data, len, utf16_be_bom, sizeof(utf16_be_bom)) || | |
613 | has_bom_prefix(data, len, utf16_le_bom, sizeof(utf16_le_bom))) | |
614 | ) || ( | |
615 | (same_utf_encoding("UTF-32BE", enc) || | |
616 | same_utf_encoding("UTF-32LE", enc)) && | |
617 | (has_bom_prefix(data, len, utf32_be_bom, sizeof(utf32_be_bom)) || | |
618 | has_bom_prefix(data, len, utf32_le_bom, sizeof(utf32_le_bom))) | |
619 | ); | |
620 | } | |
621 | ||
622 | int is_missing_required_utf_bom(const char *enc, const char *data, size_t len) | |
623 | { | |
624 | return ( | |
625 | (same_utf_encoding(enc, "UTF-16")) && | |
626 | !(has_bom_prefix(data, len, utf16_be_bom, sizeof(utf16_be_bom)) || | |
627 | has_bom_prefix(data, len, utf16_le_bom, sizeof(utf16_le_bom))) | |
628 | ) || ( | |
629 | (same_utf_encoding(enc, "UTF-32")) && | |
630 | !(has_bom_prefix(data, len, utf32_be_bom, sizeof(utf32_be_bom)) || | |
631 | has_bom_prefix(data, len, utf32_le_bom, sizeof(utf32_le_bom))) | |
632 | ); | |
633 | } | |
634 | ||
635 | /* | |
636 | * Returns first character length in bytes for multi-byte `text` according to | |
637 | * `encoding`. | |
638 | * | |
639 | * - The `text` pointer is updated to point at the next character. | |
640 | * - When `remainder_p` is not NULL, on entry `*remainder_p` is how much bytes | |
641 | * we can consume from text, and on exit `*remainder_p` is reduced by returned | |
642 | * character length. Otherwise `text` is treated as limited by NUL. | |
643 | */ | |
644 | int mbs_chrlen(const char **text, size_t *remainder_p, const char *encoding) | |
645 | { | |
646 | int chrlen; | |
647 | const char *p = *text; | |
648 | size_t r = (remainder_p ? *remainder_p : SIZE_MAX); | |
649 | ||
650 | if (r < 1) | |
651 | return 0; | |
652 | ||
653 | if (is_encoding_utf8(encoding)) { | |
654 | pick_one_utf8_char(&p, &r); | |
655 | ||
656 | chrlen = p ? (p - *text) | |
657 | : 1 /* not valid UTF-8 -> raw byte sequence */; | |
658 | } | |
659 | else { | |
660 | /* | |
661 | * TODO use iconv to decode one char and obtain its chrlen | |
662 | * for now, let's treat encodings != UTF-8 as one-byte | |
663 | */ | |
664 | chrlen = 1; | |
665 | } | |
666 | ||
667 | *text += chrlen; | |
668 | if (remainder_p) | |
669 | *remainder_p -= chrlen; | |
670 | ||
671 | return chrlen; | |
672 | } | |
673 | ||
674 | /* | |
675 | * Pick the next char from the stream, ignoring codepoints an HFS+ would. | |
676 | * Note that this is _not_ complete by any means. It's just enough | |
677 | * to make is_hfs_dotgit() work, and should not be used otherwise. | |
678 | */ | |
679 | static ucs_char_t next_hfs_char(const char **in) | |
680 | { | |
681 | while (1) { | |
682 | ucs_char_t out = pick_one_utf8_char(in, NULL); | |
683 | /* | |
684 | * check for malformed utf8. Technically this | |
685 | * gets converted to a percent-sequence, but | |
686 | * returning 0 is good enough for is_hfs_dotgit | |
687 | * to realize it cannot be .git | |
688 | */ | |
689 | if (!*in) | |
690 | return 0; | |
691 | ||
692 | /* these code points are ignored completely */ | |
693 | switch (out) { | |
694 | case 0x200c: /* ZERO WIDTH NON-JOINER */ | |
695 | case 0x200d: /* ZERO WIDTH JOINER */ | |
696 | case 0x200e: /* LEFT-TO-RIGHT MARK */ | |
697 | case 0x200f: /* RIGHT-TO-LEFT MARK */ | |
698 | case 0x202a: /* LEFT-TO-RIGHT EMBEDDING */ | |
699 | case 0x202b: /* RIGHT-TO-LEFT EMBEDDING */ | |
700 | case 0x202c: /* POP DIRECTIONAL FORMATTING */ | |
701 | case 0x202d: /* LEFT-TO-RIGHT OVERRIDE */ | |
702 | case 0x202e: /* RIGHT-TO-LEFT OVERRIDE */ | |
703 | case 0x206a: /* INHIBIT SYMMETRIC SWAPPING */ | |
704 | case 0x206b: /* ACTIVATE SYMMETRIC SWAPPING */ | |
705 | case 0x206c: /* INHIBIT ARABIC FORM SHAPING */ | |
706 | case 0x206d: /* ACTIVATE ARABIC FORM SHAPING */ | |
707 | case 0x206e: /* NATIONAL DIGIT SHAPES */ | |
708 | case 0x206f: /* NOMINAL DIGIT SHAPES */ | |
709 | case 0xfeff: /* ZERO WIDTH NO-BREAK SPACE */ | |
710 | continue; | |
711 | } | |
712 | ||
713 | return out; | |
714 | } | |
715 | } | |
716 | ||
717 | static int is_hfs_dot_generic(const char *path, | |
718 | const char *needle, size_t needle_len) | |
719 | { | |
720 | ucs_char_t c; | |
721 | ||
722 | c = next_hfs_char(&path); | |
723 | if (c != '.') | |
724 | return 0; | |
725 | ||
726 | /* | |
727 | * there's a great deal of other case-folding that occurs | |
728 | * in HFS+, but this is enough to catch our fairly vanilla | |
729 | * hard-coded needles. | |
730 | */ | |
731 | for (; needle_len > 0; needle++, needle_len--) { | |
732 | c = next_hfs_char(&path); | |
733 | ||
734 | /* | |
735 | * We know our needles contain only ASCII, so we clamp here to | |
736 | * make the results of tolower() sane. | |
737 | */ | |
738 | if (c > 127) | |
739 | return 0; | |
740 | if (tolower(c) != *needle) | |
741 | return 0; | |
742 | } | |
743 | ||
744 | c = next_hfs_char(&path); | |
745 | if (c && !is_dir_sep(c)) | |
746 | return 0; | |
747 | ||
748 | return 1; | |
749 | } | |
750 | ||
751 | /* | |
752 | * Inline wrapper to make sure the compiler resolves strlen() on literals at | |
753 | * compile time. | |
754 | */ | |
755 | static inline int is_hfs_dot_str(const char *path, const char *needle) | |
756 | { | |
757 | return is_hfs_dot_generic(path, needle, strlen(needle)); | |
758 | } | |
759 | ||
760 | int is_hfs_dotgit(const char *path) | |
761 | { | |
762 | return is_hfs_dot_str(path, "git"); | |
763 | } | |
764 | ||
765 | int is_hfs_dotgitmodules(const char *path) | |
766 | { | |
767 | return is_hfs_dot_str(path, "gitmodules"); | |
768 | } | |
769 | ||
770 | int is_hfs_dotgitignore(const char *path) | |
771 | { | |
772 | return is_hfs_dot_str(path, "gitignore"); | |
773 | } | |
774 | ||
775 | int is_hfs_dotgitattributes(const char *path) | |
776 | { | |
777 | return is_hfs_dot_str(path, "gitattributes"); | |
778 | } | |
779 | ||
780 | const char utf8_bom[] = "\357\273\277"; | |
781 | ||
782 | int skip_utf8_bom(char **text, size_t len) | |
783 | { | |
784 | if (len < strlen(utf8_bom) || | |
785 | memcmp(*text, utf8_bom, strlen(utf8_bom))) | |
786 | return 0; | |
787 | *text += strlen(utf8_bom); | |
788 | return 1; | |
789 | } | |
790 | ||
791 | void strbuf_utf8_align(struct strbuf *buf, align_type position, unsigned int width, | |
792 | const char *s) | |
793 | { | |
794 | int slen = strlen(s); | |
795 | int display_len = utf8_strnwidth(s, slen, 0); | |
796 | int utf8_compensation = slen - display_len; | |
797 | ||
798 | if (display_len >= width) { | |
799 | strbuf_addstr(buf, s); | |
800 | return; | |
801 | } | |
802 | ||
803 | if (position == ALIGN_LEFT) | |
804 | strbuf_addf(buf, "%-*s", width + utf8_compensation, s); | |
805 | else if (position == ALIGN_MIDDLE) { | |
806 | int left = (width - display_len) / 2; | |
807 | strbuf_addf(buf, "%*s%-*s", left, "", width - left + utf8_compensation, s); | |
808 | } else if (position == ALIGN_RIGHT) | |
809 | strbuf_addf(buf, "%*s", width + utf8_compensation, s); | |
810 | } |