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Commit | Line | Data |
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6c510bee | 1 | #include "cache.h" |
35ebfd6a | 2 | #include "attr.h" |
3fed15f5 | 3 | #include "run-command.h" |
a2b665de | 4 | #include "quote.h" |
6424c2ad | 5 | #include "sigchain.h" |
35ebfd6a | 6 | |
6c510bee LT |
7 | /* |
8 | * convert.c - convert a file when checking it out and checking it in. | |
9 | * | |
10 | * This should use the pathname to decide on whether it wants to do some | |
11 | * more interesting conversions (automatic gzip/unzip, general format | |
12 | * conversions etc etc), but by default it just does automatic CRLF<->LF | |
942e7747 | 13 | * translation when the "text" attribute or "auto_crlf" option is set. |
6c510bee LT |
14 | */ |
15 | ||
c61dcff9 | 16 | enum crlf_action { |
fd6cce9e EB |
17 | CRLF_GUESS = -1, |
18 | CRLF_BINARY = 0, | |
19 | CRLF_TEXT, | |
20 | CRLF_INPUT, | |
21 | CRLF_CRLF, | |
c9b6782a | 22 | CRLF_AUTO |
fd6cce9e | 23 | }; |
163b9591 | 24 | |
6c510bee | 25 | struct text_stat { |
28624193 DP |
26 | /* NUL, CR, LF and CRLF counts */ |
27 | unsigned nul, cr, lf, crlf; | |
6c510bee LT |
28 | |
29 | /* These are just approximations! */ | |
30 | unsigned printable, nonprintable; | |
31 | }; | |
32 | ||
33 | static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats) | |
34 | { | |
35 | unsigned long i; | |
36 | ||
37 | memset(stats, 0, sizeof(*stats)); | |
38 | ||
39 | for (i = 0; i < size; i++) { | |
40 | unsigned char c = buf[i]; | |
41 | if (c == '\r') { | |
42 | stats->cr++; | |
43 | if (i+1 < size && buf[i+1] == '\n') | |
44 | stats->crlf++; | |
45 | continue; | |
46 | } | |
47 | if (c == '\n') { | |
48 | stats->lf++; | |
49 | continue; | |
50 | } | |
51 | if (c == 127) | |
52 | /* DEL */ | |
53 | stats->nonprintable++; | |
54 | else if (c < 32) { | |
55 | switch (c) { | |
56 | /* BS, HT, ESC and FF */ | |
57 | case '\b': case '\t': case '\033': case '\014': | |
58 | stats->printable++; | |
59 | break; | |
28624193 DP |
60 | case 0: |
61 | stats->nul++; | |
62 | /* fall through */ | |
6c510bee LT |
63 | default: |
64 | stats->nonprintable++; | |
65 | } | |
66 | } | |
67 | else | |
68 | stats->printable++; | |
69 | } | |
f9dd4bf4 DK |
70 | |
71 | /* If file ends with EOF then don't count this EOF as non-printable. */ | |
72 | if (size >= 1 && buf[size-1] == '\032') | |
73 | stats->nonprintable--; | |
6c510bee LT |
74 | } |
75 | ||
76 | /* | |
77 | * The same heuristics as diff.c::mmfile_is_binary() | |
78 | */ | |
79 | static int is_binary(unsigned long size, struct text_stat *stats) | |
80 | { | |
81 | ||
28624193 DP |
82 | if (stats->nul) |
83 | return 1; | |
6c510bee LT |
84 | if ((stats->printable >> 7) < stats->nonprintable) |
85 | return 1; | |
86 | /* | |
87 | * Other heuristics? Average line length might be relevant, | |
88 | * as might LF vs CR vs CRLF counts.. | |
89 | * | |
90 | * NOTE! It might be normal to have a low ratio of CRLF to LF | |
91 | * (somebody starts with a LF-only file and edits it with an editor | |
92 | * that adds CRLF only to lines that are added..). But do we | |
93 | * want to support CR-only? Probably not. | |
94 | */ | |
95 | return 0; | |
96 | } | |
97 | ||
c61dcff9 | 98 | static enum eol output_eol(enum crlf_action crlf_action) |
f217f0e8 | 99 | { |
c61dcff9 | 100 | switch (crlf_action) { |
942e7747 EB |
101 | case CRLF_BINARY: |
102 | return EOL_UNSET; | |
103 | case CRLF_CRLF: | |
104 | return EOL_CRLF; | |
105 | case CRLF_INPUT: | |
106 | return EOL_LF; | |
107 | case CRLF_GUESS: | |
108 | if (!auto_crlf) | |
109 | return EOL_UNSET; | |
110 | /* fall through */ | |
111 | case CRLF_TEXT: | |
112 | case CRLF_AUTO: | |
113 | if (auto_crlf == AUTO_CRLF_TRUE) | |
114 | return EOL_CRLF; | |
115 | else if (auto_crlf == AUTO_CRLF_INPUT) | |
116 | return EOL_LF; | |
ec70f52f | 117 | else if (core_eol == EOL_UNSET) |
942e7747 EB |
118 | return EOL_NATIVE; |
119 | } | |
ec70f52f | 120 | return core_eol; |
942e7747 EB |
121 | } |
122 | ||
c61dcff9 | 123 | static void check_safe_crlf(const char *path, enum crlf_action crlf_action, |
21e5ad50 SP |
124 | struct text_stat *stats, enum safe_crlf checksafe) |
125 | { | |
126 | if (!checksafe) | |
127 | return; | |
128 | ||
c61dcff9 | 129 | if (output_eol(crlf_action) == EOL_LF) { |
21e5ad50 SP |
130 | /* |
131 | * CRLFs would not be restored by checkout: | |
132 | * check if we'd remove CRLFs | |
133 | */ | |
134 | if (stats->crlf) { | |
135 | if (checksafe == SAFE_CRLF_WARN) | |
942e7747 | 136 | warning("CRLF will be replaced by LF in %s.\nThe file will have its original line endings in your working directory.", path); |
21e5ad50 SP |
137 | else /* i.e. SAFE_CRLF_FAIL */ |
138 | die("CRLF would be replaced by LF in %s.", path); | |
139 | } | |
c61dcff9 | 140 | } else if (output_eol(crlf_action) == EOL_CRLF) { |
21e5ad50 SP |
141 | /* |
142 | * CRLFs would be added by checkout: | |
143 | * check if we have "naked" LFs | |
144 | */ | |
145 | if (stats->lf != stats->crlf) { | |
146 | if (checksafe == SAFE_CRLF_WARN) | |
942e7747 | 147 | warning("LF will be replaced by CRLF in %s.\nThe file will have its original line endings in your working directory.", path); |
21e5ad50 SP |
148 | else /* i.e. SAFE_CRLF_FAIL */ |
149 | die("LF would be replaced by CRLF in %s", path); | |
150 | } | |
151 | } | |
152 | } | |
153 | ||
c4805393 FAG |
154 | static int has_cr_in_index(const char *path) |
155 | { | |
156 | int pos, len; | |
157 | unsigned long sz; | |
158 | enum object_type type; | |
159 | void *data; | |
160 | int has_cr; | |
161 | struct index_state *istate = &the_index; | |
162 | ||
163 | len = strlen(path); | |
164 | pos = index_name_pos(istate, path, len); | |
165 | if (pos < 0) { | |
166 | /* | |
167 | * We might be in the middle of a merge, in which | |
168 | * case we would read stage #2 (ours). | |
169 | */ | |
170 | int i; | |
171 | for (i = -pos - 1; | |
172 | (pos < 0 && i < istate->cache_nr && | |
173 | !strcmp(istate->cache[i]->name, path)); | |
174 | i++) | |
175 | if (ce_stage(istate->cache[i]) == 2) | |
176 | pos = i; | |
177 | } | |
178 | if (pos < 0) | |
179 | return 0; | |
180 | data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz); | |
181 | if (!data || type != OBJ_BLOB) { | |
182 | free(data); | |
183 | return 0; | |
184 | } | |
185 | ||
186 | has_cr = memchr(data, '\r', sz) != NULL; | |
187 | free(data); | |
188 | return has_cr; | |
189 | } | |
190 | ||
5ecd293d | 191 | static int crlf_to_git(const char *path, const char *src, size_t len, |
c61dcff9 JH |
192 | struct strbuf *buf, |
193 | enum crlf_action crlf_action, enum safe_crlf checksafe) | |
6c510bee | 194 | { |
6c510bee | 195 | struct text_stat stats; |
5ecd293d | 196 | char *dst; |
6c510bee | 197 | |
c61dcff9 | 198 | if (crlf_action == CRLF_BINARY || |
4c3b57b9 JK |
199 | (crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE) || |
200 | (src && !len)) | |
5ecd293d | 201 | return 0; |
6c510bee | 202 | |
4c3b57b9 JK |
203 | /* |
204 | * If we are doing a dry-run and have no source buffer, there is | |
205 | * nothing to analyze; we must assume we would convert. | |
206 | */ | |
207 | if (!buf && !src) | |
208 | return 1; | |
209 | ||
5ecd293d | 210 | gather_stats(src, len, &stats); |
6c510bee | 211 | |
c61dcff9 | 212 | if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) { |
201ac8ef JH |
213 | /* |
214 | * We're currently not going to even try to convert stuff | |
215 | * that has bare CR characters. Does anybody do that crazy | |
216 | * stuff? | |
217 | */ | |
218 | if (stats.cr != stats.crlf) | |
5ecd293d | 219 | return 0; |
201ac8ef JH |
220 | |
221 | /* | |
222 | * And add some heuristics for binary vs text, of course... | |
223 | */ | |
5ecd293d PH |
224 | if (is_binary(len, &stats)) |
225 | return 0; | |
c4805393 | 226 | |
c61dcff9 | 227 | if (crlf_action == CRLF_GUESS) { |
fd6cce9e EB |
228 | /* |
229 | * If the file in the index has any CR in it, do not convert. | |
230 | * This is the new safer autocrlf handling. | |
231 | */ | |
232 | if (has_cr_in_index(path)) | |
233 | return 0; | |
234 | } | |
201ac8ef | 235 | } |
6c510bee | 236 | |
c61dcff9 | 237 | check_safe_crlf(path, crlf_action, &stats, checksafe); |
21e5ad50 SP |
238 | |
239 | /* Optimization: No CR? Nothing to convert, regardless. */ | |
240 | if (!stats.cr) | |
241 | return 0; | |
242 | ||
92ac3197 JK |
243 | /* |
244 | * At this point all of our source analysis is done, and we are sure we | |
245 | * would convert. If we are in dry-run mode, we can give an answer. | |
246 | */ | |
247 | if (!buf) | |
248 | return 1; | |
249 | ||
90d16ec0 PH |
250 | /* only grow if not in place */ |
251 | if (strbuf_avail(buf) + buf->len < len) | |
252 | strbuf_grow(buf, len - buf->len); | |
5ecd293d | 253 | dst = buf->buf; |
c61dcff9 | 254 | if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) { |
163b9591 JH |
255 | /* |
256 | * If we guessed, we already know we rejected a file with | |
257 | * lone CR, and we can strip a CR without looking at what | |
258 | * follow it. | |
259 | */ | |
201ac8ef | 260 | do { |
ac78e548 | 261 | unsigned char c = *src++; |
201ac8ef | 262 | if (c != '\r') |
ac78e548 | 263 | *dst++ = c; |
5ecd293d | 264 | } while (--len); |
201ac8ef JH |
265 | } else { |
266 | do { | |
ac78e548 | 267 | unsigned char c = *src++; |
5ecd293d | 268 | if (! (c == '\r' && (1 < len && *src == '\n'))) |
ac78e548 | 269 | *dst++ = c; |
5ecd293d | 270 | } while (--len); |
201ac8ef | 271 | } |
5ecd293d PH |
272 | strbuf_setlen(buf, dst - buf->buf); |
273 | return 1; | |
6c510bee LT |
274 | } |
275 | ||
5ecd293d | 276 | static int crlf_to_worktree(const char *path, const char *src, size_t len, |
c61dcff9 | 277 | struct strbuf *buf, enum crlf_action crlf_action) |
6c510bee | 278 | { |
5ecd293d | 279 | char *to_free = NULL; |
6c510bee | 280 | struct text_stat stats; |
6c510bee | 281 | |
c61dcff9 | 282 | if (!len || output_eol(crlf_action) != EOL_CRLF) |
5ecd293d | 283 | return 0; |
6c510bee | 284 | |
5ecd293d | 285 | gather_stats(src, len, &stats); |
6c510bee LT |
286 | |
287 | /* No LF? Nothing to convert, regardless. */ | |
288 | if (!stats.lf) | |
5ecd293d | 289 | return 0; |
6c510bee LT |
290 | |
291 | /* Was it already in CRLF format? */ | |
292 | if (stats.lf == stats.crlf) | |
5ecd293d | 293 | return 0; |
6c510bee | 294 | |
c61dcff9 JH |
295 | if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) { |
296 | if (crlf_action == CRLF_GUESS) { | |
fd6cce9e EB |
297 | /* If we have any CR or CRLF line endings, we do not touch it */ |
298 | /* This is the new safer autocrlf-handling */ | |
299 | if (stats.cr > 0 || stats.crlf > 0) | |
300 | return 0; | |
301 | } | |
c4805393 | 302 | |
201ac8ef JH |
303 | /* If we have any bare CR characters, we're not going to touch it */ |
304 | if (stats.cr != stats.crlf) | |
5ecd293d | 305 | return 0; |
6c510bee | 306 | |
5ecd293d PH |
307 | if (is_binary(len, &stats)) |
308 | return 0; | |
201ac8ef | 309 | } |
6c510bee | 310 | |
5ecd293d PH |
311 | /* are we "faking" in place editing ? */ |
312 | if (src == buf->buf) | |
b315c5c0 | 313 | to_free = strbuf_detach(buf, NULL); |
5ecd293d PH |
314 | |
315 | strbuf_grow(buf, len + stats.lf - stats.crlf); | |
316 | for (;;) { | |
317 | const char *nl = memchr(src, '\n', len); | |
318 | if (!nl) | |
319 | break; | |
320 | if (nl > src && nl[-1] == '\r') { | |
321 | strbuf_add(buf, src, nl + 1 - src); | |
322 | } else { | |
323 | strbuf_add(buf, src, nl - src); | |
324 | strbuf_addstr(buf, "\r\n"); | |
325 | } | |
326 | len -= nl + 1 - src; | |
327 | src = nl + 1; | |
328 | } | |
329 | strbuf_add(buf, src, len); | |
330 | ||
331 | free(to_free); | |
332 | return 1; | |
6c510bee | 333 | } |
35ebfd6a | 334 | |
546bb582 JS |
335 | struct filter_params { |
336 | const char *src; | |
337 | unsigned long size; | |
338 | const char *cmd; | |
a2b665de | 339 | const char *path; |
546bb582 JS |
340 | }; |
341 | ||
ae6a5609 | 342 | static int filter_buffer(int in, int out, void *data) |
aa4ed402 JH |
343 | { |
344 | /* | |
345 | * Spawn cmd and feed the buffer contents through its stdin. | |
346 | */ | |
347 | struct child_process child_process; | |
546bb582 | 348 | struct filter_params *params = (struct filter_params *)data; |
aa4ed402 | 349 | int write_err, status; |
66dbfd55 GV |
350 | const char *argv[] = { NULL, NULL }; |
351 | ||
a2b665de PW |
352 | /* apply % substitution to cmd */ |
353 | struct strbuf cmd = STRBUF_INIT; | |
354 | struct strbuf path = STRBUF_INIT; | |
355 | struct strbuf_expand_dict_entry dict[] = { | |
356 | { "f", NULL, }, | |
357 | { NULL, NULL, }, | |
358 | }; | |
359 | ||
360 | /* quote the path to preserve spaces, etc. */ | |
361 | sq_quote_buf(&path, params->path); | |
362 | dict[0].value = path.buf; | |
363 | ||
364 | /* expand all %f with the quoted path */ | |
365 | strbuf_expand(&cmd, params->cmd, strbuf_expand_dict_cb, &dict); | |
366 | strbuf_release(&path); | |
367 | ||
368 | argv[0] = cmd.buf; | |
aa4ed402 JH |
369 | |
370 | memset(&child_process, 0, sizeof(child_process)); | |
dc1bfdcd | 371 | child_process.argv = argv; |
ac0ba18d | 372 | child_process.use_shell = 1; |
dc1bfdcd | 373 | child_process.in = -1; |
ae6a5609 | 374 | child_process.out = out; |
aa4ed402 | 375 | |
dc1bfdcd | 376 | if (start_command(&child_process)) |
546bb582 | 377 | return error("cannot fork to run external filter %s", params->cmd); |
aa4ed402 | 378 | |
6424c2ad JB |
379 | sigchain_push(SIGPIPE, SIG_IGN); |
380 | ||
546bb582 | 381 | write_err = (write_in_full(child_process.in, params->src, params->size) < 0); |
dc1bfdcd | 382 | if (close(child_process.in)) |
aa4ed402 JH |
383 | write_err = 1; |
384 | if (write_err) | |
546bb582 | 385 | error("cannot feed the input to external filter %s", params->cmd); |
aa4ed402 | 386 | |
6424c2ad JB |
387 | sigchain_pop(SIGPIPE); |
388 | ||
aa4ed402 JH |
389 | status = finish_command(&child_process); |
390 | if (status) | |
5709e036 | 391 | error("external filter %s failed %d", params->cmd, status); |
a2b665de PW |
392 | |
393 | strbuf_release(&cmd); | |
aa4ed402 JH |
394 | return (write_err || status); |
395 | } | |
396 | ||
5ecd293d PH |
397 | static int apply_filter(const char *path, const char *src, size_t len, |
398 | struct strbuf *dst, const char *cmd) | |
aa4ed402 JH |
399 | { |
400 | /* | |
401 | * Create a pipeline to have the command filter the buffer's | |
402 | * contents. | |
403 | * | |
404 | * (child --> cmd) --> us | |
405 | */ | |
546bb582 | 406 | int ret = 1; |
f285a2d7 | 407 | struct strbuf nbuf = STRBUF_INIT; |
546bb582 JS |
408 | struct async async; |
409 | struct filter_params params; | |
aa4ed402 JH |
410 | |
411 | if (!cmd) | |
5ecd293d | 412 | return 0; |
aa4ed402 | 413 | |
92ac3197 JK |
414 | if (!dst) |
415 | return 1; | |
416 | ||
546bb582 JS |
417 | memset(&async, 0, sizeof(async)); |
418 | async.proc = filter_buffer; | |
419 | async.data = ¶ms; | |
ae6a5609 | 420 | async.out = -1; |
546bb582 JS |
421 | params.src = src; |
422 | params.size = len; | |
423 | params.cmd = cmd; | |
a2b665de | 424 | params.path = path; |
aa4ed402 JH |
425 | |
426 | fflush(NULL); | |
546bb582 JS |
427 | if (start_async(&async)) |
428 | return 0; /* error was already reported */ | |
aa4ed402 | 429 | |
546bb582 | 430 | if (strbuf_read(&nbuf, async.out, len) < 0) { |
5ecd293d PH |
431 | error("read from external filter %s failed", cmd); |
432 | ret = 0; | |
aa4ed402 | 433 | } |
546bb582 | 434 | if (close(async.out)) { |
90d16ec0 | 435 | error("read from external filter %s failed", cmd); |
5ecd293d | 436 | ret = 0; |
aa4ed402 | 437 | } |
546bb582 JS |
438 | if (finish_async(&async)) { |
439 | error("external filter %s failed", cmd); | |
5ecd293d | 440 | ret = 0; |
aa4ed402 JH |
441 | } |
442 | ||
5ecd293d | 443 | if (ret) { |
90d16ec0 | 444 | strbuf_swap(dst, &nbuf); |
5ecd293d | 445 | } |
90d16ec0 | 446 | strbuf_release(&nbuf); |
5ecd293d | 447 | return ret; |
aa4ed402 JH |
448 | } |
449 | ||
450 | static struct convert_driver { | |
451 | const char *name; | |
452 | struct convert_driver *next; | |
cd8be6c9 BH |
453 | const char *smudge; |
454 | const char *clean; | |
aa4ed402 JH |
455 | } *user_convert, **user_convert_tail; |
456 | ||
ef90d6d4 | 457 | static int read_convert_config(const char *var, const char *value, void *cb) |
aa4ed402 JH |
458 | { |
459 | const char *ep, *name; | |
460 | int namelen; | |
461 | struct convert_driver *drv; | |
462 | ||
463 | /* | |
464 | * External conversion drivers are configured using | |
465 | * "filter.<name>.variable". | |
466 | */ | |
467 | if (prefixcmp(var, "filter.") || (ep = strrchr(var, '.')) == var + 6) | |
468 | return 0; | |
469 | name = var + 7; | |
470 | namelen = ep - name; | |
471 | for (drv = user_convert; drv; drv = drv->next) | |
472 | if (!strncmp(drv->name, name, namelen) && !drv->name[namelen]) | |
473 | break; | |
474 | if (!drv) { | |
aa4ed402 | 475 | drv = xcalloc(1, sizeof(struct convert_driver)); |
182af834 | 476 | drv->name = xmemdupz(name, namelen); |
aa4ed402 JH |
477 | *user_convert_tail = drv; |
478 | user_convert_tail = &(drv->next); | |
479 | } | |
480 | ||
481 | ep++; | |
482 | ||
483 | /* | |
484 | * filter.<name>.smudge and filter.<name>.clean specifies | |
485 | * the command line: | |
486 | * | |
487 | * command-line | |
488 | * | |
489 | * The command-line will not be interpolated in any way. | |
490 | */ | |
491 | ||
cd8be6c9 BH |
492 | if (!strcmp("smudge", ep)) |
493 | return git_config_string(&drv->smudge, var, value); | |
494 | ||
495 | if (!strcmp("clean", ep)) | |
496 | return git_config_string(&drv->clean, var, value); | |
aa4ed402 | 497 | |
aa4ed402 JH |
498 | return 0; |
499 | } | |
500 | ||
3fed15f5 JH |
501 | static int count_ident(const char *cp, unsigned long size) |
502 | { | |
503 | /* | |
af9b54bb | 504 | * "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$" |
3fed15f5 JH |
505 | */ |
506 | int cnt = 0; | |
507 | char ch; | |
508 | ||
509 | while (size) { | |
510 | ch = *cp++; | |
511 | size--; | |
512 | if (ch != '$') | |
513 | continue; | |
af9b54bb | 514 | if (size < 3) |
3fed15f5 | 515 | break; |
af9b54bb | 516 | if (memcmp("Id", cp, 2)) |
3fed15f5 | 517 | continue; |
af9b54bb AP |
518 | ch = cp[2]; |
519 | cp += 3; | |
520 | size -= 3; | |
3fed15f5 | 521 | if (ch == '$') |
af9b54bb | 522 | cnt++; /* $Id$ */ |
3fed15f5 JH |
523 | if (ch != ':') |
524 | continue; | |
525 | ||
526 | /* | |
af9b54bb | 527 | * "$Id: ... "; scan up to the closing dollar sign and discard. |
3fed15f5 JH |
528 | */ |
529 | while (size) { | |
530 | ch = *cp++; | |
531 | size--; | |
532 | if (ch == '$') { | |
533 | cnt++; | |
534 | break; | |
535 | } | |
a9f3049f HG |
536 | if (ch == '\n') |
537 | break; | |
3fed15f5 JH |
538 | } |
539 | } | |
540 | return cnt; | |
541 | } | |
542 | ||
5ecd293d PH |
543 | static int ident_to_git(const char *path, const char *src, size_t len, |
544 | struct strbuf *buf, int ident) | |
3fed15f5 | 545 | { |
5ecd293d | 546 | char *dst, *dollar; |
3fed15f5 | 547 | |
4c3b57b9 | 548 | if (!ident || (src && !count_ident(src, len))) |
5ecd293d PH |
549 | return 0; |
550 | ||
92ac3197 JK |
551 | if (!buf) |
552 | return 1; | |
553 | ||
90d16ec0 PH |
554 | /* only grow if not in place */ |
555 | if (strbuf_avail(buf) + buf->len < len) | |
556 | strbuf_grow(buf, len - buf->len); | |
5ecd293d PH |
557 | dst = buf->buf; |
558 | for (;;) { | |
559 | dollar = memchr(src, '$', len); | |
560 | if (!dollar) | |
561 | break; | |
77321184 | 562 | memmove(dst, src, dollar + 1 - src); |
5ecd293d PH |
563 | dst += dollar + 1 - src; |
564 | len -= dollar + 1 - src; | |
565 | src = dollar + 1; | |
566 | ||
567 | if (len > 3 && !memcmp(src, "Id:", 3)) { | |
568 | dollar = memchr(src + 3, '$', len - 3); | |
569 | if (!dollar) | |
570 | break; | |
a9f3049f HG |
571 | if (memchr(src + 3, '\n', dollar - src - 3)) { |
572 | /* Line break before the next dollar. */ | |
573 | continue; | |
574 | } | |
575 | ||
af9b54bb AP |
576 | memcpy(dst, "Id$", 3); |
577 | dst += 3; | |
5ecd293d PH |
578 | len -= dollar + 1 - src; |
579 | src = dollar + 1; | |
3fed15f5 JH |
580 | } |
581 | } | |
77321184 | 582 | memmove(dst, src, len); |
5ecd293d PH |
583 | strbuf_setlen(buf, dst + len - buf->buf); |
584 | return 1; | |
3fed15f5 JH |
585 | } |
586 | ||
5ecd293d PH |
587 | static int ident_to_worktree(const char *path, const char *src, size_t len, |
588 | struct strbuf *buf, int ident) | |
3fed15f5 | 589 | { |
3fed15f5 | 590 | unsigned char sha1[20]; |
07814d90 | 591 | char *to_free = NULL, *dollar, *spc; |
5ecd293d | 592 | int cnt; |
3fed15f5 JH |
593 | |
594 | if (!ident) | |
5ecd293d | 595 | return 0; |
3fed15f5 | 596 | |
5ecd293d | 597 | cnt = count_ident(src, len); |
3fed15f5 | 598 | if (!cnt) |
5ecd293d | 599 | return 0; |
3fed15f5 | 600 | |
5ecd293d PH |
601 | /* are we "faking" in place editing ? */ |
602 | if (src == buf->buf) | |
b315c5c0 | 603 | to_free = strbuf_detach(buf, NULL); |
5ecd293d | 604 | hash_sha1_file(src, len, "blob", sha1); |
3fed15f5 | 605 | |
5ecd293d PH |
606 | strbuf_grow(buf, len + cnt * 43); |
607 | for (;;) { | |
608 | /* step 1: run to the next '$' */ | |
609 | dollar = memchr(src, '$', len); | |
610 | if (!dollar) | |
611 | break; | |
612 | strbuf_add(buf, src, dollar + 1 - src); | |
613 | len -= dollar + 1 - src; | |
614 | src = dollar + 1; | |
c23290d5 | 615 | |
5ecd293d PH |
616 | /* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */ |
617 | if (len < 3 || memcmp("Id", src, 2)) | |
3fed15f5 JH |
618 | continue; |
619 | ||
5ecd293d PH |
620 | /* step 3: skip over Id$ or Id:xxxxx$ */ |
621 | if (src[2] == '$') { | |
622 | src += 3; | |
623 | len -= 3; | |
624 | } else if (src[2] == ':') { | |
625 | /* | |
626 | * It's possible that an expanded Id has crept its way into the | |
07814d90 HG |
627 | * repository, we cope with that by stripping the expansion out. |
628 | * This is probably not a good idea, since it will cause changes | |
629 | * on checkout, which won't go away by stash, but let's keep it | |
630 | * for git-style ids. | |
5ecd293d PH |
631 | */ |
632 | dollar = memchr(src + 3, '$', len - 3); | |
633 | if (!dollar) { | |
634 | /* incomplete keyword, no more '$', so just quit the loop */ | |
635 | break; | |
636 | } | |
c23290d5 | 637 | |
a9f3049f HG |
638 | if (memchr(src + 3, '\n', dollar - src - 3)) { |
639 | /* Line break before the next dollar. */ | |
640 | continue; | |
641 | } | |
642 | ||
07814d90 HG |
643 | spc = memchr(src + 4, ' ', dollar - src - 4); |
644 | if (spc && spc < dollar-1) { | |
645 | /* There are spaces in unexpected places. | |
646 | * This is probably an id from some other | |
647 | * versioning system. Keep it for now. | |
648 | */ | |
649 | continue; | |
650 | } | |
651 | ||
5ecd293d PH |
652 | len -= dollar + 1 - src; |
653 | src = dollar + 1; | |
654 | } else { | |
655 | /* it wasn't a "Id$" or "Id:xxxx$" */ | |
656 | continue; | |
657 | } | |
c23290d5 | 658 | |
5ecd293d PH |
659 | /* step 4: substitute */ |
660 | strbuf_addstr(buf, "Id: "); | |
661 | strbuf_add(buf, sha1_to_hex(sha1), 40); | |
662 | strbuf_addstr(buf, " $"); | |
3fed15f5 | 663 | } |
5ecd293d | 664 | strbuf_add(buf, src, len); |
3fed15f5 | 665 | |
5ecd293d PH |
666 | free(to_free); |
667 | return 1; | |
35ebfd6a JH |
668 | } |
669 | ||
7356b51e | 670 | static enum crlf_action git_path_check_crlf(const char *path, struct git_attr_check *check) |
35ebfd6a | 671 | { |
6073ee85 JH |
672 | const char *value = check->value; |
673 | ||
674 | if (ATTR_TRUE(value)) | |
675 | return CRLF_TEXT; | |
676 | else if (ATTR_FALSE(value)) | |
677 | return CRLF_BINARY; | |
678 | else if (ATTR_UNSET(value)) | |
679 | ; | |
680 | else if (!strcmp(value, "input")) | |
681 | return CRLF_INPUT; | |
fd6cce9e EB |
682 | else if (!strcmp(value, "auto")) |
683 | return CRLF_AUTO; | |
163b9591 | 684 | return CRLF_GUESS; |
35ebfd6a JH |
685 | } |
686 | ||
ef563de6 | 687 | static enum eol git_path_check_eol(const char *path, struct git_attr_check *check) |
fd6cce9e EB |
688 | { |
689 | const char *value = check->value; | |
690 | ||
691 | if (ATTR_UNSET(value)) | |
692 | ; | |
693 | else if (!strcmp(value, "lf")) | |
694 | return EOL_LF; | |
695 | else if (!strcmp(value, "crlf")) | |
696 | return EOL_CRLF; | |
697 | return EOL_UNSET; | |
698 | } | |
699 | ||
aa4ed402 JH |
700 | static struct convert_driver *git_path_check_convert(const char *path, |
701 | struct git_attr_check *check) | |
702 | { | |
703 | const char *value = check->value; | |
704 | struct convert_driver *drv; | |
705 | ||
706 | if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value)) | |
707 | return NULL; | |
708 | for (drv = user_convert; drv; drv = drv->next) | |
709 | if (!strcmp(value, drv->name)) | |
710 | return drv; | |
711 | return NULL; | |
712 | } | |
713 | ||
3fed15f5 JH |
714 | static int git_path_check_ident(const char *path, struct git_attr_check *check) |
715 | { | |
716 | const char *value = check->value; | |
717 | ||
718 | return !!ATTR_TRUE(value); | |
719 | } | |
720 | ||
c61dcff9 | 721 | static enum crlf_action input_crlf_action(enum crlf_action text_attr, enum eol eol_attr) |
f217f0e8 | 722 | { |
5ec3e670 | 723 | if (text_attr == CRLF_BINARY) |
fd6cce9e EB |
724 | return CRLF_BINARY; |
725 | if (eol_attr == EOL_LF) | |
726 | return CRLF_INPUT; | |
727 | if (eol_attr == EOL_CRLF) | |
728 | return CRLF_CRLF; | |
5ec3e670 | 729 | return text_attr; |
fd6cce9e EB |
730 | } |
731 | ||
3bfba20d JH |
732 | struct conv_attrs { |
733 | struct convert_driver *drv; | |
734 | enum crlf_action crlf_action; | |
735 | enum eol eol_attr; | |
736 | int ident; | |
737 | }; | |
738 | ||
83295964 JH |
739 | static const char *conv_attr_name[] = { |
740 | "crlf", "ident", "filter", "eol", "text", | |
741 | }; | |
742 | #define NUM_CONV_ATTRS ARRAY_SIZE(conv_attr_name) | |
743 | ||
3bfba20d | 744 | static void convert_attrs(struct conv_attrs *ca, const char *path) |
83295964 JH |
745 | { |
746 | int i; | |
747 | static struct git_attr_check ccheck[NUM_CONV_ATTRS]; | |
748 | ||
749 | if (!ccheck[0].attr) { | |
750 | for (i = 0; i < NUM_CONV_ATTRS; i++) | |
751 | ccheck[i].attr = git_attr(conv_attr_name[i]); | |
752 | user_convert_tail = &user_convert; | |
753 | git_config(read_convert_config, NULL); | |
754 | } | |
3bfba20d | 755 | |
d932f4eb | 756 | if (!git_check_attr(path, NUM_CONV_ATTRS, ccheck)) { |
3bfba20d JH |
757 | ca->crlf_action = git_path_check_crlf(path, ccheck + 4); |
758 | if (ca->crlf_action == CRLF_GUESS) | |
759 | ca->crlf_action = git_path_check_crlf(path, ccheck + 0); | |
760 | ca->ident = git_path_check_ident(path, ccheck + 1); | |
761 | ca->drv = git_path_check_convert(path, ccheck + 2); | |
762 | ca->eol_attr = git_path_check_eol(path, ccheck + 3); | |
763 | } else { | |
764 | ca->drv = NULL; | |
765 | ca->crlf_action = CRLF_GUESS; | |
766 | ca->eol_attr = EOL_UNSET; | |
767 | ca->ident = 0; | |
768 | } | |
83295964 JH |
769 | } |
770 | ||
21e5ad50 SP |
771 | int convert_to_git(const char *path, const char *src, size_t len, |
772 | struct strbuf *dst, enum safe_crlf checksafe) | |
35ebfd6a | 773 | { |
3bfba20d | 774 | int ret = 0; |
cd8be6c9 | 775 | const char *filter = NULL; |
3bfba20d | 776 | struct conv_attrs ca; |
6073ee85 | 777 | |
3bfba20d JH |
778 | convert_attrs(&ca, path); |
779 | if (ca.drv) | |
780 | filter = ca.drv->clean; | |
3fed15f5 | 781 | |
5ecd293d | 782 | ret |= apply_filter(path, src, len, dst, filter); |
92ac3197 | 783 | if (ret && dst) { |
5ecd293d PH |
784 | src = dst->buf; |
785 | len = dst->len; | |
aa4ed402 | 786 | } |
3bfba20d JH |
787 | ca.crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr); |
788 | ret |= crlf_to_git(path, src, len, dst, ca.crlf_action, checksafe); | |
92ac3197 | 789 | if (ret && dst) { |
5ecd293d PH |
790 | src = dst->buf; |
791 | len = dst->len; | |
6073ee85 | 792 | } |
3bfba20d | 793 | return ret | ident_to_git(path, src, len, dst, ca.ident); |
35ebfd6a JH |
794 | } |
795 | ||
43dd2332 EB |
796 | static int convert_to_working_tree_internal(const char *path, const char *src, |
797 | size_t len, struct strbuf *dst, | |
798 | int normalizing) | |
35ebfd6a | 799 | { |
3bfba20d | 800 | int ret = 0; |
cd8be6c9 | 801 | const char *filter = NULL; |
3bfba20d | 802 | struct conv_attrs ca; |
6073ee85 | 803 | |
3bfba20d JH |
804 | convert_attrs(&ca, path); |
805 | if (ca.drv) | |
806 | filter = ca.drv->smudge; | |
3fed15f5 | 807 | |
3bfba20d | 808 | ret |= ident_to_worktree(path, src, len, dst, ca.ident); |
5ecd293d PH |
809 | if (ret) { |
810 | src = dst->buf; | |
811 | len = dst->len; | |
3fed15f5 | 812 | } |
43dd2332 EB |
813 | /* |
814 | * CRLF conversion can be skipped if normalizing, unless there | |
815 | * is a smudge filter. The filter might expect CRLFs. | |
816 | */ | |
817 | if (filter || !normalizing) { | |
3bfba20d JH |
818 | ca.crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr); |
819 | ret |= crlf_to_worktree(path, src, len, dst, ca.crlf_action); | |
43dd2332 EB |
820 | if (ret) { |
821 | src = dst->buf; | |
822 | len = dst->len; | |
823 | } | |
aa4ed402 | 824 | } |
5ecd293d | 825 | return ret | apply_filter(path, src, len, dst, filter); |
35ebfd6a | 826 | } |
f217f0e8 | 827 | |
43dd2332 EB |
828 | int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst) |
829 | { | |
830 | return convert_to_working_tree_internal(path, src, len, dst, 0); | |
831 | } | |
832 | ||
f217f0e8 EB |
833 | int renormalize_buffer(const char *path, const char *src, size_t len, struct strbuf *dst) |
834 | { | |
43dd2332 | 835 | int ret = convert_to_working_tree_internal(path, src, len, dst, 1); |
f217f0e8 EB |
836 | if (ret) { |
837 | src = dst->buf; | |
838 | len = dst->len; | |
839 | } | |
7356b51e | 840 | return ret | convert_to_git(path, src, len, dst, SAFE_CRLF_FALSE); |
f217f0e8 | 841 | } |
dd8e9121 | 842 | |
b6691092 JH |
843 | /***************************************************************** |
844 | * | |
845 | * Streaming converison support | |
846 | * | |
847 | *****************************************************************/ | |
848 | ||
849 | typedef int (*filter_fn)(struct stream_filter *, | |
850 | const char *input, size_t *isize_p, | |
851 | char *output, size_t *osize_p); | |
852 | typedef void (*free_fn)(struct stream_filter *); | |
853 | ||
854 | struct stream_filter_vtbl { | |
855 | filter_fn filter; | |
856 | free_fn free; | |
857 | }; | |
858 | ||
859 | struct stream_filter { | |
860 | struct stream_filter_vtbl *vtbl; | |
861 | }; | |
862 | ||
863 | static int null_filter_fn(struct stream_filter *filter, | |
864 | const char *input, size_t *isize_p, | |
865 | char *output, size_t *osize_p) | |
866 | { | |
4ae66704 JH |
867 | size_t count; |
868 | ||
869 | if (!input) | |
870 | return 0; /* we do not keep any states */ | |
871 | count = *isize_p; | |
b6691092 JH |
872 | if (*osize_p < count) |
873 | count = *osize_p; | |
874 | if (count) { | |
875 | memmove(output, input, count); | |
876 | *isize_p -= count; | |
877 | *osize_p -= count; | |
878 | } | |
879 | return 0; | |
880 | } | |
881 | ||
882 | static void null_free_fn(struct stream_filter *filter) | |
883 | { | |
884 | ; /* nothing -- null instances are shared */ | |
885 | } | |
886 | ||
887 | static struct stream_filter_vtbl null_vtbl = { | |
888 | null_filter_fn, | |
889 | null_free_fn, | |
890 | }; | |
891 | ||
892 | static struct stream_filter null_filter_singleton = { | |
893 | &null_vtbl, | |
894 | }; | |
895 | ||
896 | int is_null_stream_filter(struct stream_filter *filter) | |
897 | { | |
898 | return filter == &null_filter_singleton; | |
899 | } | |
900 | ||
b84c7839 JH |
901 | |
902 | /* | |
903 | * LF-to-CRLF filter | |
904 | */ | |
284e3d28 CMN |
905 | |
906 | struct lf_to_crlf_filter { | |
907 | struct stream_filter filter; | |
8496f568 JH |
908 | unsigned has_held:1; |
909 | char held; | |
284e3d28 CMN |
910 | }; |
911 | ||
e322ee38 JH |
912 | static int lf_to_crlf_filter_fn(struct stream_filter *filter, |
913 | const char *input, size_t *isize_p, | |
914 | char *output, size_t *osize_p) | |
915 | { | |
284e3d28 CMN |
916 | size_t count, o = 0; |
917 | struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter; | |
918 | ||
8496f568 JH |
919 | /* |
920 | * We may be holding onto the CR to see if it is followed by a | |
921 | * LF, in which case we would need to go to the main loop. | |
922 | * Otherwise, just emit it to the output stream. | |
923 | */ | |
924 | if (lf_to_crlf->has_held && (lf_to_crlf->held != '\r' || !input)) { | |
925 | output[o++] = lf_to_crlf->held; | |
926 | lf_to_crlf->has_held = 0; | |
284e3d28 | 927 | } |
e322ee38 | 928 | |
87afe9a5 JH |
929 | /* We are told to drain */ |
930 | if (!input) { | |
931 | *osize_p -= o; | |
932 | return 0; | |
933 | } | |
e322ee38 | 934 | |
e322ee38 | 935 | count = *isize_p; |
8496f568 | 936 | if (count || lf_to_crlf->has_held) { |
284e3d28 | 937 | size_t i; |
8496f568 JH |
938 | int was_cr = 0; |
939 | ||
940 | if (lf_to_crlf->has_held) { | |
941 | was_cr = 1; | |
942 | lf_to_crlf->has_held = 0; | |
943 | } | |
944 | ||
284e3d28 | 945 | for (i = 0; o < *osize_p && i < count; i++) { |
e322ee38 | 946 | char ch = input[i]; |
8496f568 | 947 | |
e322ee38 | 948 | if (ch == '\n') { |
284e3d28 | 949 | output[o++] = '\r'; |
8496f568 JH |
950 | } else if (was_cr) { |
951 | /* | |
952 | * Previous round saw CR and it is not followed | |
953 | * by a LF; emit the CR before processing the | |
954 | * current character. | |
955 | */ | |
956 | output[o++] = '\r'; | |
e322ee38 | 957 | } |
8496f568 JH |
958 | |
959 | /* | |
960 | * We may have consumed the last output slot, | |
961 | * in which case we need to break out of this | |
962 | * loop; hold the current character before | |
963 | * returning. | |
964 | */ | |
965 | if (*osize_p <= o) { | |
966 | lf_to_crlf->has_held = 1; | |
967 | lf_to_crlf->held = ch; | |
968 | continue; /* break but increment i */ | |
969 | } | |
970 | ||
971 | if (ch == '\r') { | |
972 | was_cr = 1; | |
973 | continue; | |
974 | } | |
975 | ||
976 | was_cr = 0; | |
e322ee38 JH |
977 | output[o++] = ch; |
978 | } | |
979 | ||
980 | *osize_p -= o; | |
981 | *isize_p -= i; | |
8496f568 JH |
982 | |
983 | if (!lf_to_crlf->has_held && was_cr) { | |
984 | lf_to_crlf->has_held = 1; | |
985 | lf_to_crlf->held = '\r'; | |
986 | } | |
e322ee38 JH |
987 | } |
988 | return 0; | |
989 | } | |
990 | ||
284e3d28 CMN |
991 | static void lf_to_crlf_free_fn(struct stream_filter *filter) |
992 | { | |
993 | free(filter); | |
994 | } | |
995 | ||
e322ee38 JH |
996 | static struct stream_filter_vtbl lf_to_crlf_vtbl = { |
997 | lf_to_crlf_filter_fn, | |
284e3d28 | 998 | lf_to_crlf_free_fn, |
e322ee38 JH |
999 | }; |
1000 | ||
284e3d28 CMN |
1001 | static struct stream_filter *lf_to_crlf_filter(void) |
1002 | { | |
87afe9a5 | 1003 | struct lf_to_crlf_filter *lf_to_crlf = xcalloc(1, sizeof(*lf_to_crlf)); |
e322ee38 | 1004 | |
284e3d28 | 1005 | lf_to_crlf->filter.vtbl = &lf_to_crlf_vtbl; |
284e3d28 CMN |
1006 | return (struct stream_filter *)lf_to_crlf; |
1007 | } | |
b84c7839 | 1008 | |
a265a7f9 JH |
1009 | /* |
1010 | * Cascade filter | |
1011 | */ | |
1012 | #define FILTER_BUFFER 1024 | |
1013 | struct cascade_filter { | |
1014 | struct stream_filter filter; | |
1015 | struct stream_filter *one; | |
1016 | struct stream_filter *two; | |
1017 | char buf[FILTER_BUFFER]; | |
1018 | int end, ptr; | |
1019 | }; | |
1020 | ||
1021 | static int cascade_filter_fn(struct stream_filter *filter, | |
1022 | const char *input, size_t *isize_p, | |
1023 | char *output, size_t *osize_p) | |
1024 | { | |
1025 | struct cascade_filter *cas = (struct cascade_filter *) filter; | |
1026 | size_t filled = 0; | |
1027 | size_t sz = *osize_p; | |
1028 | size_t to_feed, remaining; | |
1029 | ||
1030 | /* | |
1031 | * input -- (one) --> buf -- (two) --> output | |
1032 | */ | |
1033 | while (filled < sz) { | |
1034 | remaining = sz - filled; | |
1035 | ||
1036 | /* do we already have something to feed two with? */ | |
1037 | if (cas->ptr < cas->end) { | |
1038 | to_feed = cas->end - cas->ptr; | |
1039 | if (stream_filter(cas->two, | |
1040 | cas->buf + cas->ptr, &to_feed, | |
1041 | output + filled, &remaining)) | |
1042 | return -1; | |
1043 | cas->ptr += (cas->end - cas->ptr) - to_feed; | |
1044 | filled = sz - remaining; | |
1045 | continue; | |
1046 | } | |
1047 | ||
1048 | /* feed one from upstream and have it emit into our buffer */ | |
1049 | to_feed = input ? *isize_p : 0; | |
1050 | if (input && !to_feed) | |
1051 | break; | |
1052 | remaining = sizeof(cas->buf); | |
1053 | if (stream_filter(cas->one, | |
1054 | input, &to_feed, | |
1055 | cas->buf, &remaining)) | |
1056 | return -1; | |
1057 | cas->end = sizeof(cas->buf) - remaining; | |
1058 | cas->ptr = 0; | |
1059 | if (input) { | |
1060 | size_t fed = *isize_p - to_feed; | |
1061 | *isize_p -= fed; | |
1062 | input += fed; | |
1063 | } | |
1064 | ||
1065 | /* do we know that we drained one completely? */ | |
1066 | if (input || cas->end) | |
1067 | continue; | |
1068 | ||
1069 | /* tell two to drain; we have nothing more to give it */ | |
1070 | to_feed = 0; | |
1071 | remaining = sz - filled; | |
1072 | if (stream_filter(cas->two, | |
1073 | NULL, &to_feed, | |
1074 | output + filled, &remaining)) | |
1075 | return -1; | |
1076 | if (remaining == (sz - filled)) | |
1077 | break; /* completely drained two */ | |
1078 | filled = sz - remaining; | |
1079 | } | |
1080 | *osize_p -= filled; | |
1081 | return 0; | |
1082 | } | |
1083 | ||
1084 | static void cascade_free_fn(struct stream_filter *filter) | |
1085 | { | |
1086 | struct cascade_filter *cas = (struct cascade_filter *)filter; | |
1087 | free_stream_filter(cas->one); | |
1088 | free_stream_filter(cas->two); | |
1089 | free(filter); | |
1090 | } | |
1091 | ||
1092 | static struct stream_filter_vtbl cascade_vtbl = { | |
1093 | cascade_filter_fn, | |
1094 | cascade_free_fn, | |
1095 | }; | |
1096 | ||
1097 | static struct stream_filter *cascade_filter(struct stream_filter *one, | |
1098 | struct stream_filter *two) | |
1099 | { | |
1100 | struct cascade_filter *cascade; | |
1101 | ||
1102 | if (!one || is_null_stream_filter(one)) | |
1103 | return two; | |
1104 | if (!two || is_null_stream_filter(two)) | |
1105 | return one; | |
1106 | ||
1107 | cascade = xmalloc(sizeof(*cascade)); | |
1108 | cascade->one = one; | |
1109 | cascade->two = two; | |
1110 | cascade->end = cascade->ptr = 0; | |
1111 | cascade->filter.vtbl = &cascade_vtbl; | |
1112 | return (struct stream_filter *)cascade; | |
1113 | } | |
1114 | ||
b84c7839 JH |
1115 | /* |
1116 | * ident filter | |
1117 | */ | |
1118 | #define IDENT_DRAINING (-1) | |
1119 | #define IDENT_SKIPPING (-2) | |
1120 | struct ident_filter { | |
1121 | struct stream_filter filter; | |
1122 | struct strbuf left; | |
1123 | int state; | |
1124 | char ident[45]; /* ": x40 $" */ | |
1125 | }; | |
1126 | ||
1127 | static int is_foreign_ident(const char *str) | |
1128 | { | |
1129 | int i; | |
1130 | ||
1131 | if (prefixcmp(str, "$Id: ")) | |
1132 | return 0; | |
1133 | for (i = 5; str[i]; i++) { | |
1134 | if (isspace(str[i]) && str[i+1] != '$') | |
1135 | return 1; | |
1136 | } | |
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | static void ident_drain(struct ident_filter *ident, char **output_p, size_t *osize_p) | |
1141 | { | |
1142 | size_t to_drain = ident->left.len; | |
1143 | ||
1144 | if (*osize_p < to_drain) | |
1145 | to_drain = *osize_p; | |
1146 | if (to_drain) { | |
1147 | memcpy(*output_p, ident->left.buf, to_drain); | |
1148 | strbuf_remove(&ident->left, 0, to_drain); | |
1149 | *output_p += to_drain; | |
1150 | *osize_p -= to_drain; | |
1151 | } | |
1152 | if (!ident->left.len) | |
1153 | ident->state = 0; | |
1154 | } | |
1155 | ||
1156 | static int ident_filter_fn(struct stream_filter *filter, | |
1157 | const char *input, size_t *isize_p, | |
1158 | char *output, size_t *osize_p) | |
1159 | { | |
1160 | struct ident_filter *ident = (struct ident_filter *)filter; | |
1161 | static const char head[] = "$Id"; | |
1162 | ||
1163 | if (!input) { | |
1164 | /* drain upon eof */ | |
1165 | switch (ident->state) { | |
1166 | default: | |
1167 | strbuf_add(&ident->left, head, ident->state); | |
1168 | case IDENT_SKIPPING: | |
1169 | /* fallthru */ | |
1170 | case IDENT_DRAINING: | |
1171 | ident_drain(ident, &output, osize_p); | |
1172 | } | |
1173 | return 0; | |
1174 | } | |
1175 | ||
1176 | while (*isize_p || (ident->state == IDENT_DRAINING)) { | |
1177 | int ch; | |
1178 | ||
1179 | if (ident->state == IDENT_DRAINING) { | |
1180 | ident_drain(ident, &output, osize_p); | |
1181 | if (!*osize_p) | |
1182 | break; | |
1183 | continue; | |
1184 | } | |
1185 | ||
1186 | ch = *(input++); | |
1187 | (*isize_p)--; | |
1188 | ||
1189 | if (ident->state == IDENT_SKIPPING) { | |
1190 | /* | |
1191 | * Skipping until '$' or LF, but keeping them | |
1192 | * in case it is a foreign ident. | |
1193 | */ | |
1194 | strbuf_addch(&ident->left, ch); | |
1195 | if (ch != '\n' && ch != '$') | |
1196 | continue; | |
1197 | if (ch == '$' && !is_foreign_ident(ident->left.buf)) { | |
1198 | strbuf_setlen(&ident->left, sizeof(head) - 1); | |
1199 | strbuf_addstr(&ident->left, ident->ident); | |
1200 | } | |
1201 | ident->state = IDENT_DRAINING; | |
1202 | continue; | |
1203 | } | |
1204 | ||
1205 | if (ident->state < sizeof(head) && | |
1206 | head[ident->state] == ch) { | |
1207 | ident->state++; | |
1208 | continue; | |
1209 | } | |
1210 | ||
1211 | if (ident->state) | |
1212 | strbuf_add(&ident->left, head, ident->state); | |
1213 | if (ident->state == sizeof(head) - 1) { | |
1214 | if (ch != ':' && ch != '$') { | |
1215 | strbuf_addch(&ident->left, ch); | |
1216 | ident->state = 0; | |
1217 | continue; | |
1218 | } | |
1219 | ||
1220 | if (ch == ':') { | |
1221 | strbuf_addch(&ident->left, ch); | |
1222 | ident->state = IDENT_SKIPPING; | |
1223 | } else { | |
1224 | strbuf_addstr(&ident->left, ident->ident); | |
1225 | ident->state = IDENT_DRAINING; | |
1226 | } | |
1227 | continue; | |
1228 | } | |
1229 | ||
1230 | strbuf_addch(&ident->left, ch); | |
1231 | ident->state = IDENT_DRAINING; | |
1232 | } | |
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | static void ident_free_fn(struct stream_filter *filter) | |
1237 | { | |
1238 | struct ident_filter *ident = (struct ident_filter *)filter; | |
1239 | strbuf_release(&ident->left); | |
1240 | free(filter); | |
1241 | } | |
1242 | ||
1243 | static struct stream_filter_vtbl ident_vtbl = { | |
1244 | ident_filter_fn, | |
1245 | ident_free_fn, | |
1246 | }; | |
1247 | ||
1248 | static struct stream_filter *ident_filter(const unsigned char *sha1) | |
1249 | { | |
1250 | struct ident_filter *ident = xmalloc(sizeof(*ident)); | |
1251 | ||
1252 | sprintf(ident->ident, ": %s $", sha1_to_hex(sha1)); | |
1253 | strbuf_init(&ident->left, 0); | |
1254 | ident->filter.vtbl = &ident_vtbl; | |
1255 | ident->state = 0; | |
1256 | return (struct stream_filter *)ident; | |
1257 | } | |
1258 | ||
dd8e9121 | 1259 | /* |
b6691092 JH |
1260 | * Return an appropriately constructed filter for the path, or NULL if |
1261 | * the contents cannot be filtered without reading the whole thing | |
1262 | * in-core. | |
1263 | * | |
1264 | * Note that you would be crazy to set CRLF, smuge/clean or ident to a | |
1265 | * large binary blob you would want us not to slurp into the memory! | |
dd8e9121 | 1266 | */ |
b6691092 | 1267 | struct stream_filter *get_stream_filter(const char *path, const unsigned char *sha1) |
dd8e9121 JH |
1268 | { |
1269 | struct conv_attrs ca; | |
1270 | enum crlf_action crlf_action; | |
b84c7839 | 1271 | struct stream_filter *filter = NULL; |
dd8e9121 JH |
1272 | |
1273 | convert_attrs(&ca, path); | |
1274 | ||
b84c7839 JH |
1275 | if (ca.drv && (ca.drv->smudge || ca.drv->clean)) |
1276 | return filter; | |
1277 | ||
1278 | if (ca.ident) | |
1279 | filter = ident_filter(sha1); | |
dd8e9121 JH |
1280 | |
1281 | crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr); | |
b84c7839 | 1282 | |
b0d9c69f | 1283 | if ((crlf_action == CRLF_BINARY) || (crlf_action == CRLF_INPUT) || |
a265a7f9 JH |
1284 | (crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE)) |
1285 | filter = cascade_filter(filter, &null_filter_singleton); | |
1286 | ||
1287 | else if (output_eol(crlf_action) == EOL_CRLF && | |
1288 | !(crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS)) | |
284e3d28 | 1289 | filter = cascade_filter(filter, lf_to_crlf_filter()); |
e322ee38 | 1290 | |
b84c7839 | 1291 | return filter; |
b6691092 JH |
1292 | } |
1293 | ||
1294 | void free_stream_filter(struct stream_filter *filter) | |
1295 | { | |
1296 | filter->vtbl->free(filter); | |
1297 | } | |
1298 | ||
1299 | int stream_filter(struct stream_filter *filter, | |
1300 | const char *input, size_t *isize_p, | |
1301 | char *output, size_t *osize_p) | |
1302 | { | |
1303 | return filter->vtbl->filter(filter, input, isize_p, output, osize_p); | |
dd8e9121 | 1304 | } |