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chromium / external / github.com / git / git / refs/tags/v2.13.4 / . / utf8.c
blob: 0c8e011a58cae3c683851007ec81828ad8284471 [file] [log] [blame]
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]1#include "git-compat-util.h"
Johannes Schindelina94410c2008-11-10 17:47:00[diff] [blame]2#include "strbuf.h"
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]3#include "utf8.h"
4
5/* This code is originally from http://www.cl.cam.ac.uk/~mgk25/ucs/ */
6
7struct interval {
John Keepinga68a67d2014-02-16 16:06:04[diff] [blame]8 ucs_char_t first;
9 ucs_char_t last;
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]10};
11
Nguyễn Thái Ngọc Duy16406322013-04-18 23:08:52[diff] [blame]12size_t display_mode_esc_sequence_len(const char *s)
Nguyễn Thái Ngọc Duy4247fe72013-04-18 23:08:44[diff] [blame]13{
14 const char *p = s;
15 if (*p++ != '\033')
16 return 0;
17 if (*p++ != '[')
18 return 0;
19 while (isdigit(*p) || *p == ';')
20 p++;
21 if (*p++ != 'm')
22 return 0;
23 return p - s;
24}
25
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]26/* auxiliary function for binary search in interval table */
Junio C Hamanof3fa1832007-11-08 23:35:32[diff] [blame]27static int bisearch(ucs_char_t ucs, const struct interval *table, int max)
28{
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]29 int min = 0;
30 int mid;
31
32 if (ucs < table[0].first || ucs > table[max].last)
33 return 0;
34 while (max >= min) {
35 mid = (min + max) / 2;
36 if (ucs > table[mid].last)
37 min = mid + 1;
38 else if (ucs < table[mid].first)
39 max = mid - 1;
40 else
41 return 1;
42 }
43
44 return 0;
45}
46
47/* The following two functions define the column width of an ISO 10646
48 * character as follows:
49 *
50 * - The null character (U+0000) has a column width of 0.
51 *
52 * - Other C0/C1 control characters and DEL will lead to a return
53 * value of -1.
54 *
55 * - Non-spacing and enclosing combining characters (general
56 * category code Mn or Me in the Unicode database) have a
57 * column width of 0.
58 *
59 * - SOFT HYPHEN (U+00AD) has a column width of 1.
60 *
61 * - Other format characters (general category code Cf in the Unicode
62 * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
63 *
64 * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
65 * have a column width of 0.
66 *
67 * - Spacing characters in the East Asian Wide (W) or East Asian
68 * Full-width (F) category as defined in Unicode Technical
69 * Report #11 have a column width of 2.
70 *
71 * - All remaining characters (including all printable
72 * ISO 8859-1 and WGL4 characters, Unicode control characters,
73 * etc.) have a column width of 1.
74 *
Ramsay Jones28321142007-03-03 18:28:57[diff] [blame]75 * This implementation assumes that ucs_char_t characters are encoded
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]76 * in ISO 10646.
77 */
78
Amos Waterlandb51be132007-05-08 04:46:08[diff] [blame]79static int git_wcwidth(ucs_char_t ch)
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]80{
81 /*
82 * Sorted list of non-overlapping intervals of non-spacing characters,
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]83 */
Torsten Bögershausen9c943892014-05-09 21:51:44[diff] [blame]84#include "unicode_width.h"
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]85
86 /* test for 8-bit control characters */
87 if (ch == 0)
88 return 0;
89 if (ch < 32 || (ch >= 0x7f && ch < 0xa0))
90 return -1;
91
92 /* binary search in table of non-spacing characters */
Torsten Bögershausen9c943892014-05-09 21:51:44[diff] [blame]93 if (bisearch(ch, zero_width, sizeof(zero_width)
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]94 / sizeof(struct interval) - 1))
95 return 0;
96
Torsten Bögershausen08460342014-05-09 21:51:38[diff] [blame]97 /* binary search in table of double width characters */
98 if (bisearch(ch, double_width, sizeof(double_width)
99 / sizeof(struct interval) - 1))
100 return 2;
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]101
Torsten Bögershausen08460342014-05-09 21:51:38[diff] [blame]102 return 1;
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]103}
104
105/*
Junio C Hamano396ccf12008-01-07 03:02:22[diff] [blame]106 * Pick one ucs character starting from the location *start points at,
107 * and return it, while updating the *start pointer to point at the
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]108 * end of that character. When remainder_p is not NULL, the location
109 * holds the number of bytes remaining in the string that we are allowed
110 * to pick from. Otherwise we are allowed to pick up to the NUL that
111 * would eventually appear in the string. *remainder_p is also reduced
112 * by the number of bytes we have consumed.
Junio C Hamano396ccf12008-01-07 03:02:22[diff] [blame]113 *
114 * If the string was not a valid UTF-8, *start pointer is set to NULL
115 * and the return value is undefined.
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]116 */
Junio C Hamano5e133b82010-01-12 06:32:29[diff] [blame]117static ucs_char_t pick_one_utf8_char(const char **start, size_t *remainder_p)
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]118{
119 unsigned char *s = (unsigned char *)*start;
Ramsay Jones28321142007-03-03 18:28:57[diff] [blame]120 ucs_char_t ch;
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]121 size_t remainder, incr;
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]122
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]123 /*
124 * A caller that assumes NUL terminated text can choose
125 * not to bother with the remainder length. We will
126 * stop at the first NUL.
127 */
128 remainder = (remainder_p ? *remainder_p : 999);
129
130 if (remainder < 1) {
131 goto invalid;
132 } else if (*s < 0x80) {
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]133 /* 0xxxxxxx */
134 ch = *s;
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]135 incr = 1;
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]136 } else if ((s[0] & 0xe0) == 0xc0) {
137 /* 110XXXXx 10xxxxxx */
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]138 if (remainder < 2 ||
139 (s[1] & 0xc0) != 0x80 ||
140 (s[0] & 0xfe) == 0xc0)
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]141 goto invalid;
142 ch = ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]143 incr = 2;
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]144 } else if ((s[0] & 0xf0) == 0xe0) {
145 /* 1110XXXX 10Xxxxxx 10xxxxxx */
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]146 if (remainder < 3 ||
147 (s[1] & 0xc0) != 0x80 ||
148 (s[2] & 0xc0) != 0x80 ||
149 /* overlong? */
150 (s[0] == 0xe0 && (s[1] & 0xe0) == 0x80) ||
151 /* surrogate? */
152 (s[0] == 0xed && (s[1] & 0xe0) == 0xa0) ||
153 /* U+FFFE or U+FFFF? */
154 (s[0] == 0xef && s[1] == 0xbf &&
155 (s[2] & 0xfe) == 0xbe))
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]156 goto invalid;
157 ch = ((s[0] & 0x0f) << 12) |
158 ((s[1] & 0x3f) << 6) | (s[2] & 0x3f);
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]159 incr = 3;
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]160 } else if ((s[0] & 0xf8) == 0xf0) {
161 /* 11110XXX 10XXxxxx 10xxxxxx 10xxxxxx */
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]162 if (remainder < 4 ||
163 (s[1] & 0xc0) != 0x80 ||
164 (s[2] & 0xc0) != 0x80 ||
165 (s[3] & 0xc0) != 0x80 ||
166 /* overlong? */
167 (s[0] == 0xf0 && (s[1] & 0xf0) == 0x80) ||
168 /* > U+10FFFF? */
169 (s[0] == 0xf4 && s[1] > 0x8f) || s[0] > 0xf4)
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]170 goto invalid;
171 ch = ((s[0] & 0x07) << 18) | ((s[1] & 0x3f) << 12) |
172 ((s[2] & 0x3f) << 6) | (s[3] & 0x3f);
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]173 incr = 4;
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]174 } else {
175invalid:
176 *start = NULL;
177 return 0;
178 }
179
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]180 *start += incr;
181 if (remainder_p)
182 *remainder_p = remainder - incr;
Junio C Hamano396ccf12008-01-07 03:02:22[diff] [blame]183 return ch;
184}
185
186/*
187 * This function returns the number of columns occupied by the character
188 * pointed to by the variable start. The pointer is updated to point at
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]189 * the next character. When remainder_p is not NULL, it points at the
190 * location that stores the number of remaining bytes we can use to pick
191 * a character (see pick_one_utf8_char() above).
Junio C Hamano396ccf12008-01-07 03:02:22[diff] [blame]192 */
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]193int utf8_width(const char **start, size_t *remainder_p)
Junio C Hamano396ccf12008-01-07 03:02:22[diff] [blame]194{
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]195 ucs_char_t ch = pick_one_utf8_char(start, remainder_p);
Junio C Hamano396ccf12008-01-07 03:02:22[diff] [blame]196 if (!*start)
197 return 0;
Amos Waterlandb51be132007-05-08 04:46:08[diff] [blame]198 return git_wcwidth(ch);
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]199}
200
Geoffrey Thomas8a9391e2009-01-30 09:41:28[diff] [blame]201/*
202 * Returns the total number of columns required by a null-terminated
203 * string, assuming that the string is utf8. Returns strlen() instead
204 * if the string does not look like a valid utf8 string.
205 */
Nguyễn Thái Ngọc Duy2bc1e7e2013-04-18 23:08:45[diff] [blame]206int utf8_strnwidth(const char *string, int len, int skip_ansi)
Geoffrey Thomas8a9391e2009-01-30 09:41:28[diff] [blame]207{
208 int width = 0;
209 const char *orig = string;
210
Nguyễn Thái Ngọc Duy2bc1e7e2013-04-18 23:08:45[diff] [blame]211 if (len == -1)
212 len = strlen(string);
213 while (string && string < orig + len) {
214 int skip;
215 while (skip_ansi &&
216 (skip = display_mode_esc_sequence_len(string)) != 0)
217 string += skip;
Geoffrey Thomas8a9391e2009-01-30 09:41:28[diff] [blame]218 width += utf8_width(&string, NULL);
219 }
Nguyễn Thái Ngọc Duy2bc1e7e2013-04-18 23:08:45[diff] [blame]220 return string ? width : len;
221}
222
223int utf8_strwidth(const char *string)
224{
225 return utf8_strnwidth(string, -1, 0);
Geoffrey Thomas8a9391e2009-01-30 09:41:28[diff] [blame]226}
227
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]228int is_utf8(const char *text)
229{
230 while (*text) {
231 if (*text == '\n' || *text == '\t' || *text == '\r') {
232 text++;
233 continue;
234 }
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]235 utf8_width(&text, NULL);
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]236 if (!text)
237 return 0;
238 }
239 return 1;
240}
241
René Scharfe37bb5d72009-11-22 16:15:29[diff] [blame]242static void strbuf_add_indented_text(struct strbuf *buf, const char *text,
243 int indent, int indent2)
244{
245 if (indent < 0)
246 indent = 0;
247 while (*text) {
248 const char *eol = strchrnul(text, '\n');
249 if (*eol == '\n')
250 eol++;
René Scharfe3c0ff442010-02-19 22:15:55[diff] [blame]251 strbuf_addchars(buf, ' ', indent);
René Scharfe68ad5e12010-02-19 22:16:45[diff] [blame]252 strbuf_add(buf, text, eol - text);
René Scharfe37bb5d72009-11-22 16:15:29[diff] [blame]253 text = eol;
254 indent = indent2;
255 }
256}
257
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]258/*
259 * Wrap the text, if necessary. The variable indent is the indent for the
260 * first line, indent2 is the indent for all other lines.
Johannes Schindelin094e03b2007-02-27 15:20:31[diff] [blame]261 * If indent is negative, assume that already -indent columns have been
262 * consumed (and no extra indent is necessary for the first line).
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]263 */
Steffen Prohaskae0db1762012-12-11 05:59:22[diff] [blame]264void strbuf_add_wrapped_text(struct strbuf *buf,
René Scharfe462749b2010-02-19 22:20:44[diff] [blame]265 const char *text, int indent1, int indent2, int width)
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]266{
René Scharfe462749b2010-02-19 22:20:44[diff] [blame]267 int indent, w, assume_utf8 = 1;
268 const char *bol, *space, *start = text;
269 size_t orig_len = buf->len;
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]270
Junio C Hamano00d39472009-10-19 06:40:35[diff] [blame]271 if (width <= 0) {
René Scharfe462749b2010-02-19 22:20:44[diff] [blame]272 strbuf_add_indented_text(buf, text, indent1, indent2);
Steffen Prohaskae0db1762012-12-11 05:59:22[diff] [blame]273 return;
Junio C Hamano00d39472009-10-19 06:40:35[diff] [blame]274 }
275
René Scharfe462749b2010-02-19 22:20:44[diff] [blame]276retry:
277 bol = text;
278 w = indent = indent1;
279 space = NULL;
Johannes Schindelin094e03b2007-02-27 15:20:31[diff] [blame]280 if (indent < 0) {
281 w = -indent;
282 space = text;
283 }
284
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]285 for (;;) {
René Scharfe8a3c63e2009-11-23 22:40:03[diff] [blame]286 char c;
287 size_t skip;
288
289 while ((skip = display_mode_esc_sequence_len(text)))
290 text += skip;
291
292 c = *text;
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]293 if (!c || isspace(c)) {
Jan H. Schönherr14e1a4e2012-10-18 14:43:28[diff] [blame]294 if (w <= width || !space) {
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]295 const char *start = bol;
Johannes Schindelinae0b2702007-11-11 14:14:15[diff] [blame]296 if (!c && text == start)
Steffen Prohaskae0db1762012-12-11 05:59:22[diff] [blame]297 return;
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]298 if (space)
299 start = space;
300 else
René Scharfe3c0ff442010-02-19 22:15:55[diff] [blame]301 strbuf_addchars(buf, ' ', indent);
René Scharfe68ad5e12010-02-19 22:16:45[diff] [blame]302 strbuf_add(buf, start, text - start);
Johannes Schindelin094e03b2007-02-27 15:20:31[diff] [blame]303 if (!c)
Steffen Prohaskae0db1762012-12-11 05:59:22[diff] [blame]304 return;
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]305 space = text;
Johannes Schindelinae0b2702007-11-11 14:14:15[diff] [blame]306 if (c == '\t')
307 w |= 0x07;
308 else if (c == '\n') {
309 space++;
310 if (*space == '\n') {
René Scharfe68ad5e12010-02-19 22:16:45[diff] [blame]311 strbuf_addch(buf, '\n');
Johannes Schindelinae0b2702007-11-11 14:14:15[diff] [blame]312 goto new_line;
313 }
314 else if (!isalnum(*space))
315 goto new_line;
316 else
René Scharfe68ad5e12010-02-19 22:16:45[diff] [blame]317 strbuf_addch(buf, ' ');
Johannes Schindelinae0b2702007-11-11 14:14:15[diff] [blame]318 }
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]319 w++;
320 text++;
321 }
322 else {
Johannes Schindelinae0b2702007-11-11 14:14:15[diff] [blame]323new_line:
René Scharfe68ad5e12010-02-19 22:16:45[diff] [blame]324 strbuf_addch(buf, '\n');
Johannes Schindelin62273822007-03-02 14:28:00[diff] [blame]325 text = bol = space + isspace(*space);
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]326 space = NULL;
327 w = indent = indent2;
328 }
329 continue;
330 }
René Scharfe462749b2010-02-19 22:20:44[diff] [blame]331 if (assume_utf8) {
Junio C Hamano44b25b82008-01-02 09:49:58[diff] [blame]332 w += utf8_width(&text, NULL);
René Scharfe462749b2010-02-19 22:20:44[diff] [blame]333 if (!text) {
334 assume_utf8 = 0;
335 text = start;
336 strbuf_setlen(buf, orig_len);
337 goto retry;
338 }
339 } else {
Johannes Schindelin9e832662006-12-22 21:06:08[diff] [blame]340 w++;
341 text++;
342 }
343 }
344}
Junio C Hamanob45974a2006-12-24 07:36:55[diff] [blame]345
Steffen Prohaskae0db1762012-12-11 05:59:22[diff] [blame]346void strbuf_add_wrapped_bytes(struct strbuf *buf, const char *data, int len,
Jeff King98acc832011-02-23 09:50:19[diff] [blame]347 int indent, int indent2, int width)
348{
349 char *tmp = xstrndup(data, len);
Steffen Prohaskae0db1762012-12-11 05:59:22[diff] [blame]350 strbuf_add_wrapped_text(buf, tmp, indent, indent2, width);
Jeff King98acc832011-02-23 09:50:19[diff] [blame]351 free(tmp);
Jeff King98acc832011-02-23 09:50:19[diff] [blame]352}
353
Nguyễn Thái Ngọc Duya7f01c62013-04-18 23:08:51[diff] [blame]354void strbuf_utf8_replace(struct strbuf *sb_src, int pos, int width,
355 const char *subst)
356{
357 struct strbuf sb_dst = STRBUF_INIT;
358 char *src = sb_src->buf;
359 char *end = src + sb_src->len;
360 char *dst;
361 int w = 0, subst_len = 0;
362
363 if (subst)
364 subst_len = strlen(subst);
365 strbuf_grow(&sb_dst, sb_src->len + subst_len);
366 dst = sb_dst.buf;
367
368 while (src < end) {
369 char *old;
370 size_t n;
371
372 while ((n = display_mode_esc_sequence_len(src))) {
373 memcpy(dst, src, n);
374 src += n;
375 dst += n;
376 }
377
Nguyễn Thái Ngọc Duy43087592014-08-10 07:05:21[diff] [blame]378 if (src >= end)
379 break;
380
Nguyễn Thái Ngọc Duya7f01c62013-04-18 23:08:51[diff] [blame]381 old = src;
382 n = utf8_width((const char**)&src, NULL);
383 if (!src) /* broken utf-8, do nothing */
384 return;
385 if (n && w >= pos && w < pos + width) {
386 if (subst) {
387 memcpy(dst, subst, subst_len);
388 dst += subst_len;
389 subst = NULL;
390 }
391 w += n;
392 continue;
393 }
394 memcpy(dst, old, src - old);
395 dst += src - old;
396 w += n;
397 }
398 strbuf_setlen(&sb_dst, dst - sb_dst.buf);
Ramsay Jones980419b2013-04-27 19:43:36[diff] [blame]399 strbuf_swap(sb_src, &sb_dst);
400 strbuf_release(&sb_dst);
Nguyễn Thái Ngọc Duya7f01c62013-04-18 23:08:51[diff] [blame]401}
402
Junio C Hamano677cfed2006-12-30 20:20:43[diff] [blame]403int is_encoding_utf8(const char *name)
404{
405 if (!name)
406 return 1;
407 if (!strcasecmp(name, "utf-8") || !strcasecmp(name, "utf8"))
408 return 1;
409 return 0;
410}
411
Junio C Hamano0e18bcd2012-10-19 05:41:56[diff] [blame]412int same_encoding(const char *src, const char *dst)
413{
414 if (is_encoding_utf8(src) && is_encoding_utf8(dst))
415 return 1;
416 return !strcasecmp(src, dst);
417}
418
Junio C Hamanob45974a2006-12-24 07:36:55[diff] [blame]419/*
Jiang Xinc0821962013-02-09 06:31:09[diff] [blame]420 * Wrapper for fprintf and returns the total number of columns required
421 * for the printed string, assuming that the string is utf8.
422 */
423int utf8_fprintf(FILE *stream, const char *format, ...)
424{
425 struct strbuf buf = STRBUF_INIT;
426 va_list arg;
427 int columns;
428
429 va_start(arg, format);
430 strbuf_vaddf(&buf, format, arg);
431 va_end(arg);
432
433 columns = fputs(buf.buf, stream);
434 if (0 <= columns) /* keep the error from the I/O */
435 columns = utf8_strwidth(buf.buf);
436 strbuf_release(&buf);
437 return columns;
438}
439
440/*
Junio C Hamanob45974a2006-12-24 07:36:55[diff] [blame]441 * Given a buffer and its encoding, return it re-encoded
442 * with iconv. If the conversion fails, returns NULL.
443 */
444#ifndef NO_ICONV
Brandon Casey309dbc82009-06-05 23:36:12[diff] [blame]445#if defined(OLD_ICONV) || (defined(__sun__) && !defined(_XPG6))
Ramsay Jonesfd547a92007-03-03 18:29:03[diff] [blame]446 typedef const char * iconv_ibp;
447#else
448 typedef char * iconv_ibp;
449#endif
Nguyễn Thái Ngọc Duyb782bba2013-04-18 23:08:46[diff] [blame]450char *reencode_string_iconv(const char *in, size_t insz, iconv_t conv, int *outsz_p)
Junio C Hamanob45974a2006-12-24 07:36:55[diff] [blame]451{
Torsten Bögershausen76759c72012-07-08 13:50:25[diff] [blame]452 size_t outsz, outalloc;
Ramsay Jonesfd547a92007-03-03 18:29:03[diff] [blame]453 char *out, *outpos;
454 iconv_ibp cp;
Junio C Hamanob45974a2006-12-24 07:36:55[diff] [blame]455
Junio C Hamanob45974a2006-12-24 07:36:55[diff] [blame]456 outsz = insz;
457 outalloc = outsz + 1; /* for terminating NUL */
458 out = xmalloc(outalloc);
459 outpos = out;
Ramsay Jonesfd547a92007-03-03 18:29:03[diff] [blame]460 cp = (iconv_ibp)in;
Junio C Hamanob45974a2006-12-24 07:36:55[diff] [blame]461
462 while (1) {
463 size_t cnt = iconv(conv, &cp, &insz, &outpos, &outsz);
464
John Keepingdf5213b2014-02-16 16:06:03[diff] [blame]465 if (cnt == (size_t) -1) {
Junio C Hamanob45974a2006-12-24 07:36:55[diff] [blame]466 size_t sofar;
467 if (errno != E2BIG) {
468 free(out);
Junio C Hamanob45974a2006-12-24 07:36:55[diff] [blame]469 return NULL;
470 }
471 /* insz has remaining number of bytes.
472 * since we started outsz the same as insz,
473 * it is likely that insz is not enough for
474 * converting the rest.
475 */
476 sofar = outpos - out;
477 outalloc = sofar + insz * 2 + 32;
478 out = xrealloc(out, outalloc);
479 outpos = out + sofar;
480 outsz = outalloc - sofar - 1;
481 }
482 else {
483 *outpos = '\0';
Nguyễn Thái Ngọc Duyb782bba2013-04-18 23:08:46[diff] [blame]484 if (outsz_p)
485 *outsz_p = outpos - out;
Junio C Hamanob45974a2006-12-24 07:36:55[diff] [blame]486 break;
487 }
488 }
Torsten Bögershausen76759c72012-07-08 13:50:25[diff] [blame]489 return out;
490}
491
Junio C Hamano32707412016-09-27 01:09:48[diff] [blame]492static const char *fallback_encoding(const char *name)
493{
494 /*
495 * Some platforms do not have the variously spelled variants of
496 * UTF-8, so let's fall back to trying the most official
497 * spelling. We do so only as a fallback in case the platform
498 * does understand the user's spelling, but not our official
499 * one.
500 */
501 if (is_encoding_utf8(name))
502 return "UTF-8";
503
Junio C Hamanodf375582016-09-27 01:09:48[diff] [blame]504 /*
505 * Even though latin-1 is still seen in e-mail
506 * headers, some platforms only install ISO-8859-1.
507 */
508 if (!strcasecmp(name, "latin-1"))
509 return "ISO-8859-1";
510
Junio C Hamano32707412016-09-27 01:09:48[diff] [blame]511 return name;
512}
513
Nguyễn Thái Ngọc Duyb782bba2013-04-18 23:08:46[diff] [blame]514char *reencode_string_len(const char *in, int insz,
515 const char *out_encoding, const char *in_encoding,
516 int *outsz)
Torsten Bögershausen76759c72012-07-08 13:50:25[diff] [blame]517{
518 iconv_t conv;
519 char *out;
520
521 if (!in_encoding)
522 return NULL;
Jeff King5c680be2013-02-25 20:31:00[diff] [blame]523
Torsten Bögershausen76759c72012-07-08 13:50:25[diff] [blame]524 conv = iconv_open(out_encoding, in_encoding);
Jeff King5c680be2013-02-25 20:31:00[diff] [blame]525 if (conv == (iconv_t) -1) {
Junio C Hamano32707412016-09-27 01:09:48[diff] [blame]526 in_encoding = fallback_encoding(in_encoding);
527 out_encoding = fallback_encoding(out_encoding);
528
Jeff King5c680be2013-02-25 20:31:00[diff] [blame]529 conv = iconv_open(out_encoding, in_encoding);
530 if (conv == (iconv_t) -1)
531 return NULL;
532 }
533
Nguyễn Thái Ngọc Duyb782bba2013-04-18 23:08:46[diff] [blame]534 out = reencode_string_iconv(in, insz, conv, outsz);
Junio C Hamanob45974a2006-12-24 07:36:55[diff] [blame]535 iconv_close(conv);
536 return out;
537}
538#endif
Kirill Smelkov6cd3c052013-03-07 10:55:07[diff] [blame]539
540/*
541 * Returns first character length in bytes for multi-byte `text` according to
542 * `encoding`.
543 *
544 * - The `text` pointer is updated to point at the next character.
545 * - When `remainder_p` is not NULL, on entry `*remainder_p` is how much bytes
546 * we can consume from text, and on exit `*remainder_p` is reduced by returned
547 * character length. Otherwise `text` is treated as limited by NUL.
548 */
549int mbs_chrlen(const char **text, size_t *remainder_p, const char *encoding)
550{
551 int chrlen;
552 const char *p = *text;
553 size_t r = (remainder_p ? *remainder_p : SIZE_MAX);
554
555 if (r < 1)
556 return 0;
557
558 if (is_encoding_utf8(encoding)) {
559 pick_one_utf8_char(&p, &r);
560
561 chrlen = p ? (p - *text)
562 : 1 /* not valid UTF-8 -> raw byte sequence */;
563 }
564 else {
565 /*
566 * TODO use iconv to decode one char and obtain its chrlen
567 * for now, let's treat encodings != UTF-8 as one-byte
568 */
569 chrlen = 1;
570 }
571
572 *text += chrlen;
573 if (remainder_p)
574 *remainder_p -= chrlen;
575
576 return chrlen;
577}
Jeff King6162a1d2014-12-15 22:56:59[diff] [blame]578
579/*
Jeff King6aaf9562014-12-23 08:45:36[diff] [blame]580 * Pick the next char from the stream, ignoring codepoints an HFS+ would.
581 * Note that this is _not_ complete by any means. It's just enough
Jeff King6162a1d2014-12-15 22:56:59[diff] [blame]582 * to make is_hfs_dotgit() work, and should not be used otherwise.
583 */
584static ucs_char_t next_hfs_char(const char **in)
585{
586 while (1) {
587 ucs_char_t out = pick_one_utf8_char(in, NULL);
588 /*
589 * check for malformed utf8. Technically this
590 * gets converted to a percent-sequence, but
591 * returning 0 is good enough for is_hfs_dotgit
592 * to realize it cannot be .git
593 */
594 if (!*in)
595 return 0;
596
597 /* these code points are ignored completely */
598 switch (out) {
599 case 0x200c: /* ZERO WIDTH NON-JOINER */
600 case 0x200d: /* ZERO WIDTH JOINER */
601 case 0x200e: /* LEFT-TO-RIGHT MARK */
602 case 0x200f: /* RIGHT-TO-LEFT MARK */
603 case 0x202a: /* LEFT-TO-RIGHT EMBEDDING */
604 case 0x202b: /* RIGHT-TO-LEFT EMBEDDING */
605 case 0x202c: /* POP DIRECTIONAL FORMATTING */
606 case 0x202d: /* LEFT-TO-RIGHT OVERRIDE */
607 case 0x202e: /* RIGHT-TO-LEFT OVERRIDE */
608 case 0x206a: /* INHIBIT SYMMETRIC SWAPPING */
609 case 0x206b: /* ACTIVATE SYMMETRIC SWAPPING */
610 case 0x206c: /* INHIBIT ARABIC FORM SHAPING */
611 case 0x206d: /* ACTIVATE ARABIC FORM SHAPING */
612 case 0x206e: /* NATIONAL DIGIT SHAPES */
613 case 0x206f: /* NOMINAL DIGIT SHAPES */
614 case 0xfeff: /* ZERO WIDTH NO-BREAK SPACE */
615 continue;
616 }
617
Jeff King6aaf9562014-12-23 08:45:36[diff] [blame]618 return out;
Jeff King6162a1d2014-12-15 22:56:59[diff] [blame]619 }
620}
621
622int is_hfs_dotgit(const char *path)
623{
624 ucs_char_t c;
625
Jeff King6aaf9562014-12-23 08:45:36[diff] [blame]626 c = next_hfs_char(&path);
627 if (c != '.')
628 return 0;
629 c = next_hfs_char(&path);
630
631 /*
632 * there's a great deal of other case-folding that occurs
633 * in HFS+, but this is enough to catch anything that will
634 * convert to ".git"
635 */
636 if (c != 'g' && c != 'G')
637 return 0;
638 c = next_hfs_char(&path);
639 if (c != 'i' && c != 'I')
640 return 0;
641 c = next_hfs_char(&path);
642 if (c != 't' && c != 'T')
Jeff King6162a1d2014-12-15 22:56:59[diff] [blame]643 return 0;
644 c = next_hfs_char(&path);
645 if (c && !is_dir_sep(c))
646 return 0;
647
648 return 1;
649}
Junio C Hamanodde843e2015-04-16 17:45:29[diff] [blame]650
651const char utf8_bom[] = "\357\273\277";
652
653int skip_utf8_bom(char **text, size_t len)
654{
655 if (len < strlen(utf8_bom) ||
656 memcmp(*text, utf8_bom, strlen(utf8_bom)))
657 return 0;
658 *text += strlen(utf8_bom);
659 return 1;
660}
Karthik Nayak110dcda2015-09-10 15:48:19[diff] [blame]661
662void strbuf_utf8_align(struct strbuf *buf, align_type position, unsigned int width,
663 const char *s)
664{
665 int slen = strlen(s);
666 int display_len = utf8_strnwidth(s, slen, 0);
667 int utf8_compensation = slen - display_len;
668
669 if (display_len >= width) {
670 strbuf_addstr(buf, s);
671 return;
672 }
673
674 if (position == ALIGN_LEFT)
675 strbuf_addf(buf, "%-*s", width + utf8_compensation, s);
676 else if (position == ALIGN_MIDDLE) {
677 int left = (width - display_len) / 2;
678 strbuf_addf(buf, "%*s%-*s", left, "", width - left + utf8_compensation, s);
679 } else if (position == ALIGN_RIGHT)
680 strbuf_addf(buf, "%*s", width + utf8_compensation, s);
681}