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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 | { | |
c4805393 | 156 | unsigned long sz; |
c4805393 FAG |
157 | void *data; |
158 | int has_cr; | |
c4805393 | 159 | |
4982fd78 LF |
160 | data = read_blob_data_from_cache(path, &sz); |
161 | if (!data) | |
c4805393 | 162 | return 0; |
c4805393 FAG |
163 | has_cr = memchr(data, '\r', sz) != NULL; |
164 | free(data); | |
165 | return has_cr; | |
166 | } | |
167 | ||
5ecd293d | 168 | static int crlf_to_git(const char *path, const char *src, size_t len, |
c61dcff9 JH |
169 | struct strbuf *buf, |
170 | enum crlf_action crlf_action, enum safe_crlf checksafe) | |
6c510bee | 171 | { |
6c510bee | 172 | struct text_stat stats; |
5ecd293d | 173 | char *dst; |
6c510bee | 174 | |
c61dcff9 | 175 | if (crlf_action == CRLF_BINARY || |
4c3b57b9 JK |
176 | (crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE) || |
177 | (src && !len)) | |
5ecd293d | 178 | return 0; |
6c510bee | 179 | |
4c3b57b9 JK |
180 | /* |
181 | * If we are doing a dry-run and have no source buffer, there is | |
182 | * nothing to analyze; we must assume we would convert. | |
183 | */ | |
184 | if (!buf && !src) | |
185 | return 1; | |
186 | ||
5ecd293d | 187 | gather_stats(src, len, &stats); |
6c510bee | 188 | |
c61dcff9 | 189 | if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) { |
201ac8ef JH |
190 | /* |
191 | * We're currently not going to even try to convert stuff | |
192 | * that has bare CR characters. Does anybody do that crazy | |
193 | * stuff? | |
194 | */ | |
195 | if (stats.cr != stats.crlf) | |
5ecd293d | 196 | return 0; |
201ac8ef JH |
197 | |
198 | /* | |
199 | * And add some heuristics for binary vs text, of course... | |
200 | */ | |
5ecd293d PH |
201 | if (is_binary(len, &stats)) |
202 | return 0; | |
c4805393 | 203 | |
c61dcff9 | 204 | if (crlf_action == CRLF_GUESS) { |
fd6cce9e EB |
205 | /* |
206 | * If the file in the index has any CR in it, do not convert. | |
207 | * This is the new safer autocrlf handling. | |
208 | */ | |
209 | if (has_cr_in_index(path)) | |
210 | return 0; | |
211 | } | |
201ac8ef | 212 | } |
6c510bee | 213 | |
c61dcff9 | 214 | check_safe_crlf(path, crlf_action, &stats, checksafe); |
21e5ad50 SP |
215 | |
216 | /* Optimization: No CR? Nothing to convert, regardless. */ | |
217 | if (!stats.cr) | |
218 | return 0; | |
219 | ||
92ac3197 JK |
220 | /* |
221 | * At this point all of our source analysis is done, and we are sure we | |
222 | * would convert. If we are in dry-run mode, we can give an answer. | |
223 | */ | |
224 | if (!buf) | |
225 | return 1; | |
226 | ||
90d16ec0 PH |
227 | /* only grow if not in place */ |
228 | if (strbuf_avail(buf) + buf->len < len) | |
229 | strbuf_grow(buf, len - buf->len); | |
5ecd293d | 230 | dst = buf->buf; |
c61dcff9 | 231 | if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) { |
163b9591 JH |
232 | /* |
233 | * If we guessed, we already know we rejected a file with | |
234 | * lone CR, and we can strip a CR without looking at what | |
235 | * follow it. | |
236 | */ | |
201ac8ef | 237 | do { |
ac78e548 | 238 | unsigned char c = *src++; |
201ac8ef | 239 | if (c != '\r') |
ac78e548 | 240 | *dst++ = c; |
5ecd293d | 241 | } while (--len); |
201ac8ef JH |
242 | } else { |
243 | do { | |
ac78e548 | 244 | unsigned char c = *src++; |
5ecd293d | 245 | if (! (c == '\r' && (1 < len && *src == '\n'))) |
ac78e548 | 246 | *dst++ = c; |
5ecd293d | 247 | } while (--len); |
201ac8ef | 248 | } |
5ecd293d PH |
249 | strbuf_setlen(buf, dst - buf->buf); |
250 | return 1; | |
6c510bee LT |
251 | } |
252 | ||
5ecd293d | 253 | static int crlf_to_worktree(const char *path, const char *src, size_t len, |
c61dcff9 | 254 | struct strbuf *buf, enum crlf_action crlf_action) |
6c510bee | 255 | { |
5ecd293d | 256 | char *to_free = NULL; |
6c510bee | 257 | struct text_stat stats; |
6c510bee | 258 | |
c61dcff9 | 259 | if (!len || output_eol(crlf_action) != EOL_CRLF) |
5ecd293d | 260 | return 0; |
6c510bee | 261 | |
5ecd293d | 262 | gather_stats(src, len, &stats); |
6c510bee LT |
263 | |
264 | /* No LF? Nothing to convert, regardless. */ | |
265 | if (!stats.lf) | |
5ecd293d | 266 | return 0; |
6c510bee LT |
267 | |
268 | /* Was it already in CRLF format? */ | |
269 | if (stats.lf == stats.crlf) | |
5ecd293d | 270 | return 0; |
6c510bee | 271 | |
c61dcff9 JH |
272 | if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) { |
273 | if (crlf_action == CRLF_GUESS) { | |
fd6cce9e EB |
274 | /* If we have any CR or CRLF line endings, we do not touch it */ |
275 | /* This is the new safer autocrlf-handling */ | |
276 | if (stats.cr > 0 || stats.crlf > 0) | |
277 | return 0; | |
278 | } | |
c4805393 | 279 | |
201ac8ef JH |
280 | /* If we have any bare CR characters, we're not going to touch it */ |
281 | if (stats.cr != stats.crlf) | |
5ecd293d | 282 | return 0; |
6c510bee | 283 | |
5ecd293d PH |
284 | if (is_binary(len, &stats)) |
285 | return 0; | |
201ac8ef | 286 | } |
6c510bee | 287 | |
5ecd293d PH |
288 | /* are we "faking" in place editing ? */ |
289 | if (src == buf->buf) | |
b315c5c0 | 290 | to_free = strbuf_detach(buf, NULL); |
5ecd293d PH |
291 | |
292 | strbuf_grow(buf, len + stats.lf - stats.crlf); | |
293 | for (;;) { | |
294 | const char *nl = memchr(src, '\n', len); | |
295 | if (!nl) | |
296 | break; | |
297 | if (nl > src && nl[-1] == '\r') { | |
298 | strbuf_add(buf, src, nl + 1 - src); | |
299 | } else { | |
300 | strbuf_add(buf, src, nl - src); | |
301 | strbuf_addstr(buf, "\r\n"); | |
302 | } | |
303 | len -= nl + 1 - src; | |
304 | src = nl + 1; | |
305 | } | |
306 | strbuf_add(buf, src, len); | |
307 | ||
308 | free(to_free); | |
309 | return 1; | |
6c510bee | 310 | } |
35ebfd6a | 311 | |
546bb582 JS |
312 | struct filter_params { |
313 | const char *src; | |
314 | unsigned long size; | |
9035d75a | 315 | int fd; |
546bb582 | 316 | const char *cmd; |
a2b665de | 317 | const char *path; |
546bb582 JS |
318 | }; |
319 | ||
9035d75a | 320 | static int filter_buffer_or_fd(int in, int out, void *data) |
aa4ed402 JH |
321 | { |
322 | /* | |
323 | * Spawn cmd and feed the buffer contents through its stdin. | |
324 | */ | |
d3180279 | 325 | struct child_process child_process = CHILD_PROCESS_INIT; |
546bb582 | 326 | struct filter_params *params = (struct filter_params *)data; |
aa4ed402 | 327 | int write_err, status; |
66dbfd55 GV |
328 | const char *argv[] = { NULL, NULL }; |
329 | ||
a2b665de PW |
330 | /* apply % substitution to cmd */ |
331 | struct strbuf cmd = STRBUF_INIT; | |
332 | struct strbuf path = STRBUF_INIT; | |
333 | struct strbuf_expand_dict_entry dict[] = { | |
334 | { "f", NULL, }, | |
335 | { NULL, NULL, }, | |
336 | }; | |
337 | ||
338 | /* quote the path to preserve spaces, etc. */ | |
339 | sq_quote_buf(&path, params->path); | |
340 | dict[0].value = path.buf; | |
341 | ||
342 | /* expand all %f with the quoted path */ | |
343 | strbuf_expand(&cmd, params->cmd, strbuf_expand_dict_cb, &dict); | |
344 | strbuf_release(&path); | |
345 | ||
346 | argv[0] = cmd.buf; | |
aa4ed402 | 347 | |
dc1bfdcd | 348 | child_process.argv = argv; |
ac0ba18d | 349 | child_process.use_shell = 1; |
dc1bfdcd | 350 | child_process.in = -1; |
ae6a5609 | 351 | child_process.out = out; |
aa4ed402 | 352 | |
dc1bfdcd | 353 | if (start_command(&child_process)) |
546bb582 | 354 | return error("cannot fork to run external filter %s", params->cmd); |
aa4ed402 | 355 | |
6424c2ad JB |
356 | sigchain_push(SIGPIPE, SIG_IGN); |
357 | ||
9035d75a | 358 | if (params->src) { |
0c4dd67a JH |
359 | write_err = (write_in_full(child_process.in, |
360 | params->src, params->size) < 0); | |
361 | if (errno == EPIPE) | |
362 | write_err = 0; | |
9035d75a SP |
363 | } else { |
364 | write_err = copy_fd(params->fd, child_process.in); | |
0c4dd67a JH |
365 | if (write_err == COPY_WRITE_ERROR && errno == EPIPE) |
366 | write_err = 0; | |
9035d75a SP |
367 | } |
368 | ||
dc1bfdcd | 369 | if (close(child_process.in)) |
aa4ed402 JH |
370 | write_err = 1; |
371 | if (write_err) | |
546bb582 | 372 | error("cannot feed the input to external filter %s", params->cmd); |
aa4ed402 | 373 | |
6424c2ad JB |
374 | sigchain_pop(SIGPIPE); |
375 | ||
aa4ed402 JH |
376 | status = finish_command(&child_process); |
377 | if (status) | |
5709e036 | 378 | error("external filter %s failed %d", params->cmd, status); |
a2b665de PW |
379 | |
380 | strbuf_release(&cmd); | |
aa4ed402 JH |
381 | return (write_err || status); |
382 | } | |
383 | ||
9035d75a | 384 | static int apply_filter(const char *path, const char *src, size_t len, int fd, |
5ecd293d | 385 | struct strbuf *dst, const char *cmd) |
aa4ed402 JH |
386 | { |
387 | /* | |
388 | * Create a pipeline to have the command filter the buffer's | |
389 | * contents. | |
390 | * | |
391 | * (child --> cmd) --> us | |
392 | */ | |
546bb582 | 393 | int ret = 1; |
f285a2d7 | 394 | struct strbuf nbuf = STRBUF_INIT; |
546bb582 JS |
395 | struct async async; |
396 | struct filter_params params; | |
aa4ed402 JH |
397 | |
398 | if (!cmd) | |
5ecd293d | 399 | return 0; |
aa4ed402 | 400 | |
92ac3197 JK |
401 | if (!dst) |
402 | return 1; | |
403 | ||
546bb582 | 404 | memset(&async, 0, sizeof(async)); |
9035d75a | 405 | async.proc = filter_buffer_or_fd; |
546bb582 | 406 | async.data = ¶ms; |
ae6a5609 | 407 | async.out = -1; |
546bb582 JS |
408 | params.src = src; |
409 | params.size = len; | |
9035d75a | 410 | params.fd = fd; |
546bb582 | 411 | params.cmd = cmd; |
a2b665de | 412 | params.path = path; |
aa4ed402 JH |
413 | |
414 | fflush(NULL); | |
546bb582 JS |
415 | if (start_async(&async)) |
416 | return 0; /* error was already reported */ | |
aa4ed402 | 417 | |
546bb582 | 418 | if (strbuf_read(&nbuf, async.out, len) < 0) { |
5ecd293d PH |
419 | error("read from external filter %s failed", cmd); |
420 | ret = 0; | |
aa4ed402 | 421 | } |
546bb582 | 422 | if (close(async.out)) { |
90d16ec0 | 423 | error("read from external filter %s failed", cmd); |
5ecd293d | 424 | ret = 0; |
aa4ed402 | 425 | } |
546bb582 JS |
426 | if (finish_async(&async)) { |
427 | error("external filter %s failed", cmd); | |
5ecd293d | 428 | ret = 0; |
aa4ed402 JH |
429 | } |
430 | ||
5ecd293d | 431 | if (ret) { |
90d16ec0 | 432 | strbuf_swap(dst, &nbuf); |
5ecd293d | 433 | } |
90d16ec0 | 434 | strbuf_release(&nbuf); |
5ecd293d | 435 | return ret; |
aa4ed402 JH |
436 | } |
437 | ||
438 | static struct convert_driver { | |
439 | const char *name; | |
440 | struct convert_driver *next; | |
cd8be6c9 BH |
441 | const char *smudge; |
442 | const char *clean; | |
36daaaca | 443 | int required; |
aa4ed402 JH |
444 | } *user_convert, **user_convert_tail; |
445 | ||
ef90d6d4 | 446 | static int read_convert_config(const char *var, const char *value, void *cb) |
aa4ed402 | 447 | { |
d731f0ad | 448 | const char *key, *name; |
aa4ed402 JH |
449 | int namelen; |
450 | struct convert_driver *drv; | |
451 | ||
452 | /* | |
453 | * External conversion drivers are configured using | |
454 | * "filter.<name>.variable". | |
455 | */ | |
d731f0ad | 456 | if (parse_config_key(var, "filter", &name, &namelen, &key) < 0 || !name) |
aa4ed402 | 457 | return 0; |
aa4ed402 JH |
458 | for (drv = user_convert; drv; drv = drv->next) |
459 | if (!strncmp(drv->name, name, namelen) && !drv->name[namelen]) | |
460 | break; | |
461 | if (!drv) { | |
aa4ed402 | 462 | drv = xcalloc(1, sizeof(struct convert_driver)); |
182af834 | 463 | drv->name = xmemdupz(name, namelen); |
aa4ed402 JH |
464 | *user_convert_tail = drv; |
465 | user_convert_tail = &(drv->next); | |
466 | } | |
467 | ||
aa4ed402 JH |
468 | /* |
469 | * filter.<name>.smudge and filter.<name>.clean specifies | |
470 | * the command line: | |
471 | * | |
472 | * command-line | |
473 | * | |
474 | * The command-line will not be interpolated in any way. | |
475 | */ | |
476 | ||
d731f0ad | 477 | if (!strcmp("smudge", key)) |
cd8be6c9 BH |
478 | return git_config_string(&drv->smudge, var, value); |
479 | ||
d731f0ad | 480 | if (!strcmp("clean", key)) |
cd8be6c9 | 481 | return git_config_string(&drv->clean, var, value); |
aa4ed402 | 482 | |
d731f0ad | 483 | if (!strcmp("required", key)) { |
36daaaca JB |
484 | drv->required = git_config_bool(var, value); |
485 | return 0; | |
486 | } | |
487 | ||
aa4ed402 JH |
488 | return 0; |
489 | } | |
490 | ||
3fed15f5 JH |
491 | static int count_ident(const char *cp, unsigned long size) |
492 | { | |
493 | /* | |
af9b54bb | 494 | * "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$" |
3fed15f5 JH |
495 | */ |
496 | int cnt = 0; | |
497 | char ch; | |
498 | ||
499 | while (size) { | |
500 | ch = *cp++; | |
501 | size--; | |
502 | if (ch != '$') | |
503 | continue; | |
af9b54bb | 504 | if (size < 3) |
3fed15f5 | 505 | break; |
af9b54bb | 506 | if (memcmp("Id", cp, 2)) |
3fed15f5 | 507 | continue; |
af9b54bb AP |
508 | ch = cp[2]; |
509 | cp += 3; | |
510 | size -= 3; | |
3fed15f5 | 511 | if (ch == '$') |
af9b54bb | 512 | cnt++; /* $Id$ */ |
3fed15f5 JH |
513 | if (ch != ':') |
514 | continue; | |
515 | ||
516 | /* | |
af9b54bb | 517 | * "$Id: ... "; scan up to the closing dollar sign and discard. |
3fed15f5 JH |
518 | */ |
519 | while (size) { | |
520 | ch = *cp++; | |
521 | size--; | |
522 | if (ch == '$') { | |
523 | cnt++; | |
524 | break; | |
525 | } | |
a9f3049f HG |
526 | if (ch == '\n') |
527 | break; | |
3fed15f5 JH |
528 | } |
529 | } | |
530 | return cnt; | |
531 | } | |
532 | ||
5ecd293d PH |
533 | static int ident_to_git(const char *path, const char *src, size_t len, |
534 | struct strbuf *buf, int ident) | |
3fed15f5 | 535 | { |
5ecd293d | 536 | char *dst, *dollar; |
3fed15f5 | 537 | |
4c3b57b9 | 538 | if (!ident || (src && !count_ident(src, len))) |
5ecd293d PH |
539 | return 0; |
540 | ||
92ac3197 JK |
541 | if (!buf) |
542 | return 1; | |
543 | ||
90d16ec0 PH |
544 | /* only grow if not in place */ |
545 | if (strbuf_avail(buf) + buf->len < len) | |
546 | strbuf_grow(buf, len - buf->len); | |
5ecd293d PH |
547 | dst = buf->buf; |
548 | for (;;) { | |
549 | dollar = memchr(src, '$', len); | |
550 | if (!dollar) | |
551 | break; | |
77321184 | 552 | memmove(dst, src, dollar + 1 - src); |
5ecd293d PH |
553 | dst += dollar + 1 - src; |
554 | len -= dollar + 1 - src; | |
555 | src = dollar + 1; | |
556 | ||
557 | if (len > 3 && !memcmp(src, "Id:", 3)) { | |
558 | dollar = memchr(src + 3, '$', len - 3); | |
559 | if (!dollar) | |
560 | break; | |
a9f3049f HG |
561 | if (memchr(src + 3, '\n', dollar - src - 3)) { |
562 | /* Line break before the next dollar. */ | |
563 | continue; | |
564 | } | |
565 | ||
af9b54bb AP |
566 | memcpy(dst, "Id$", 3); |
567 | dst += 3; | |
5ecd293d PH |
568 | len -= dollar + 1 - src; |
569 | src = dollar + 1; | |
3fed15f5 JH |
570 | } |
571 | } | |
77321184 | 572 | memmove(dst, src, len); |
5ecd293d PH |
573 | strbuf_setlen(buf, dst + len - buf->buf); |
574 | return 1; | |
3fed15f5 JH |
575 | } |
576 | ||
5ecd293d PH |
577 | static int ident_to_worktree(const char *path, const char *src, size_t len, |
578 | struct strbuf *buf, int ident) | |
3fed15f5 | 579 | { |
3fed15f5 | 580 | unsigned char sha1[20]; |
07814d90 | 581 | char *to_free = NULL, *dollar, *spc; |
5ecd293d | 582 | int cnt; |
3fed15f5 JH |
583 | |
584 | if (!ident) | |
5ecd293d | 585 | return 0; |
3fed15f5 | 586 | |
5ecd293d | 587 | cnt = count_ident(src, len); |
3fed15f5 | 588 | if (!cnt) |
5ecd293d | 589 | return 0; |
3fed15f5 | 590 | |
5ecd293d PH |
591 | /* are we "faking" in place editing ? */ |
592 | if (src == buf->buf) | |
b315c5c0 | 593 | to_free = strbuf_detach(buf, NULL); |
5ecd293d | 594 | hash_sha1_file(src, len, "blob", sha1); |
3fed15f5 | 595 | |
5ecd293d PH |
596 | strbuf_grow(buf, len + cnt * 43); |
597 | for (;;) { | |
598 | /* step 1: run to the next '$' */ | |
599 | dollar = memchr(src, '$', len); | |
600 | if (!dollar) | |
601 | break; | |
602 | strbuf_add(buf, src, dollar + 1 - src); | |
603 | len -= dollar + 1 - src; | |
604 | src = dollar + 1; | |
c23290d5 | 605 | |
5ecd293d PH |
606 | /* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */ |
607 | if (len < 3 || memcmp("Id", src, 2)) | |
3fed15f5 JH |
608 | continue; |
609 | ||
5ecd293d PH |
610 | /* step 3: skip over Id$ or Id:xxxxx$ */ |
611 | if (src[2] == '$') { | |
612 | src += 3; | |
613 | len -= 3; | |
614 | } else if (src[2] == ':') { | |
615 | /* | |
616 | * It's possible that an expanded Id has crept its way into the | |
07814d90 HG |
617 | * repository, we cope with that by stripping the expansion out. |
618 | * This is probably not a good idea, since it will cause changes | |
619 | * on checkout, which won't go away by stash, but let's keep it | |
620 | * for git-style ids. | |
5ecd293d PH |
621 | */ |
622 | dollar = memchr(src + 3, '$', len - 3); | |
623 | if (!dollar) { | |
624 | /* incomplete keyword, no more '$', so just quit the loop */ | |
625 | break; | |
626 | } | |
c23290d5 | 627 | |
a9f3049f HG |
628 | if (memchr(src + 3, '\n', dollar - src - 3)) { |
629 | /* Line break before the next dollar. */ | |
630 | continue; | |
631 | } | |
632 | ||
07814d90 HG |
633 | spc = memchr(src + 4, ' ', dollar - src - 4); |
634 | if (spc && spc < dollar-1) { | |
635 | /* There are spaces in unexpected places. | |
636 | * This is probably an id from some other | |
637 | * versioning system. Keep it for now. | |
638 | */ | |
639 | continue; | |
640 | } | |
641 | ||
5ecd293d PH |
642 | len -= dollar + 1 - src; |
643 | src = dollar + 1; | |
644 | } else { | |
645 | /* it wasn't a "Id$" or "Id:xxxx$" */ | |
646 | continue; | |
647 | } | |
c23290d5 | 648 | |
5ecd293d PH |
649 | /* step 4: substitute */ |
650 | strbuf_addstr(buf, "Id: "); | |
651 | strbuf_add(buf, sha1_to_hex(sha1), 40); | |
652 | strbuf_addstr(buf, " $"); | |
3fed15f5 | 653 | } |
5ecd293d | 654 | strbuf_add(buf, src, len); |
3fed15f5 | 655 | |
5ecd293d PH |
656 | free(to_free); |
657 | return 1; | |
35ebfd6a JH |
658 | } |
659 | ||
7356b51e | 660 | static enum crlf_action git_path_check_crlf(const char *path, struct git_attr_check *check) |
35ebfd6a | 661 | { |
6073ee85 JH |
662 | const char *value = check->value; |
663 | ||
664 | if (ATTR_TRUE(value)) | |
665 | return CRLF_TEXT; | |
666 | else if (ATTR_FALSE(value)) | |
667 | return CRLF_BINARY; | |
668 | else if (ATTR_UNSET(value)) | |
669 | ; | |
670 | else if (!strcmp(value, "input")) | |
671 | return CRLF_INPUT; | |
fd6cce9e EB |
672 | else if (!strcmp(value, "auto")) |
673 | return CRLF_AUTO; | |
163b9591 | 674 | return CRLF_GUESS; |
35ebfd6a JH |
675 | } |
676 | ||
ef563de6 | 677 | static enum eol git_path_check_eol(const char *path, struct git_attr_check *check) |
fd6cce9e EB |
678 | { |
679 | const char *value = check->value; | |
680 | ||
681 | if (ATTR_UNSET(value)) | |
682 | ; | |
683 | else if (!strcmp(value, "lf")) | |
684 | return EOL_LF; | |
685 | else if (!strcmp(value, "crlf")) | |
686 | return EOL_CRLF; | |
687 | return EOL_UNSET; | |
688 | } | |
689 | ||
aa4ed402 JH |
690 | static struct convert_driver *git_path_check_convert(const char *path, |
691 | struct git_attr_check *check) | |
692 | { | |
693 | const char *value = check->value; | |
694 | struct convert_driver *drv; | |
695 | ||
696 | if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value)) | |
697 | return NULL; | |
698 | for (drv = user_convert; drv; drv = drv->next) | |
699 | if (!strcmp(value, drv->name)) | |
700 | return drv; | |
701 | return NULL; | |
702 | } | |
703 | ||
3fed15f5 JH |
704 | static int git_path_check_ident(const char *path, struct git_attr_check *check) |
705 | { | |
706 | const char *value = check->value; | |
707 | ||
708 | return !!ATTR_TRUE(value); | |
709 | } | |
710 | ||
c61dcff9 | 711 | static enum crlf_action input_crlf_action(enum crlf_action text_attr, enum eol eol_attr) |
f217f0e8 | 712 | { |
5ec3e670 | 713 | if (text_attr == CRLF_BINARY) |
fd6cce9e EB |
714 | return CRLF_BINARY; |
715 | if (eol_attr == EOL_LF) | |
716 | return CRLF_INPUT; | |
717 | if (eol_attr == EOL_CRLF) | |
718 | return CRLF_CRLF; | |
5ec3e670 | 719 | return text_attr; |
fd6cce9e EB |
720 | } |
721 | ||
3bfba20d JH |
722 | struct conv_attrs { |
723 | struct convert_driver *drv; | |
724 | enum crlf_action crlf_action; | |
725 | enum eol eol_attr; | |
726 | int ident; | |
727 | }; | |
728 | ||
83295964 JH |
729 | static const char *conv_attr_name[] = { |
730 | "crlf", "ident", "filter", "eol", "text", | |
731 | }; | |
732 | #define NUM_CONV_ATTRS ARRAY_SIZE(conv_attr_name) | |
733 | ||
3bfba20d | 734 | static void convert_attrs(struct conv_attrs *ca, const char *path) |
83295964 JH |
735 | { |
736 | int i; | |
737 | static struct git_attr_check ccheck[NUM_CONV_ATTRS]; | |
738 | ||
739 | if (!ccheck[0].attr) { | |
740 | for (i = 0; i < NUM_CONV_ATTRS; i++) | |
741 | ccheck[i].attr = git_attr(conv_attr_name[i]); | |
742 | user_convert_tail = &user_convert; | |
743 | git_config(read_convert_config, NULL); | |
744 | } | |
3bfba20d | 745 | |
d932f4eb | 746 | if (!git_check_attr(path, NUM_CONV_ATTRS, ccheck)) { |
3bfba20d JH |
747 | ca->crlf_action = git_path_check_crlf(path, ccheck + 4); |
748 | if (ca->crlf_action == CRLF_GUESS) | |
749 | ca->crlf_action = git_path_check_crlf(path, ccheck + 0); | |
750 | ca->ident = git_path_check_ident(path, ccheck + 1); | |
751 | ca->drv = git_path_check_convert(path, ccheck + 2); | |
752 | ca->eol_attr = git_path_check_eol(path, ccheck + 3); | |
753 | } else { | |
754 | ca->drv = NULL; | |
755 | ca->crlf_action = CRLF_GUESS; | |
756 | ca->eol_attr = EOL_UNSET; | |
757 | ca->ident = 0; | |
758 | } | |
83295964 JH |
759 | } |
760 | ||
9035d75a SP |
761 | int would_convert_to_git_filter_fd(const char *path) |
762 | { | |
763 | struct conv_attrs ca; | |
764 | ||
765 | convert_attrs(&ca, path); | |
766 | if (!ca.drv) | |
767 | return 0; | |
768 | ||
769 | /* | |
770 | * Apply a filter to an fd only if the filter is required to succeed. | |
771 | * We must die if the filter fails, because the original data before | |
772 | * filtering is not available. | |
773 | */ | |
774 | if (!ca.drv->required) | |
775 | return 0; | |
776 | ||
777 | return apply_filter(path, NULL, 0, -1, NULL, ca.drv->clean); | |
778 | } | |
779 | ||
21e5ad50 SP |
780 | int convert_to_git(const char *path, const char *src, size_t len, |
781 | struct strbuf *dst, enum safe_crlf checksafe) | |
35ebfd6a | 782 | { |
3bfba20d | 783 | int ret = 0; |
cd8be6c9 | 784 | const char *filter = NULL; |
36daaaca | 785 | int required = 0; |
3bfba20d | 786 | struct conv_attrs ca; |
6073ee85 | 787 | |
3bfba20d | 788 | convert_attrs(&ca, path); |
36daaaca | 789 | if (ca.drv) { |
3bfba20d | 790 | filter = ca.drv->clean; |
36daaaca JB |
791 | required = ca.drv->required; |
792 | } | |
3fed15f5 | 793 | |
9035d75a | 794 | ret |= apply_filter(path, src, len, -1, dst, filter); |
36daaaca JB |
795 | if (!ret && required) |
796 | die("%s: clean filter '%s' failed", path, ca.drv->name); | |
797 | ||
92ac3197 | 798 | if (ret && dst) { |
5ecd293d PH |
799 | src = dst->buf; |
800 | len = dst->len; | |
aa4ed402 | 801 | } |
3bfba20d JH |
802 | ca.crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr); |
803 | ret |= crlf_to_git(path, src, len, dst, ca.crlf_action, checksafe); | |
92ac3197 | 804 | if (ret && dst) { |
5ecd293d PH |
805 | src = dst->buf; |
806 | len = dst->len; | |
6073ee85 | 807 | } |
3bfba20d | 808 | return ret | ident_to_git(path, src, len, dst, ca.ident); |
35ebfd6a JH |
809 | } |
810 | ||
9035d75a SP |
811 | void convert_to_git_filter_fd(const char *path, int fd, struct strbuf *dst, |
812 | enum safe_crlf checksafe) | |
813 | { | |
814 | struct conv_attrs ca; | |
815 | convert_attrs(&ca, path); | |
816 | ||
817 | assert(ca.drv); | |
818 | assert(ca.drv->clean); | |
819 | ||
820 | if (!apply_filter(path, NULL, 0, fd, dst, ca.drv->clean)) | |
821 | die("%s: clean filter '%s' failed", path, ca.drv->name); | |
822 | ||
823 | ca.crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr); | |
824 | crlf_to_git(path, dst->buf, dst->len, dst, ca.crlf_action, checksafe); | |
825 | ident_to_git(path, dst->buf, dst->len, dst, ca.ident); | |
826 | } | |
827 | ||
43dd2332 EB |
828 | static int convert_to_working_tree_internal(const char *path, const char *src, |
829 | size_t len, struct strbuf *dst, | |
830 | int normalizing) | |
35ebfd6a | 831 | { |
36daaaca | 832 | int ret = 0, ret_filter = 0; |
cd8be6c9 | 833 | const char *filter = NULL; |
36daaaca | 834 | int required = 0; |
3bfba20d | 835 | struct conv_attrs ca; |
6073ee85 | 836 | |
3bfba20d | 837 | convert_attrs(&ca, path); |
36daaaca | 838 | if (ca.drv) { |
3bfba20d | 839 | filter = ca.drv->smudge; |
36daaaca JB |
840 | required = ca.drv->required; |
841 | } | |
3fed15f5 | 842 | |
3bfba20d | 843 | ret |= ident_to_worktree(path, src, len, dst, ca.ident); |
5ecd293d PH |
844 | if (ret) { |
845 | src = dst->buf; | |
846 | len = dst->len; | |
3fed15f5 | 847 | } |
43dd2332 EB |
848 | /* |
849 | * CRLF conversion can be skipped if normalizing, unless there | |
850 | * is a smudge filter. The filter might expect CRLFs. | |
851 | */ | |
852 | if (filter || !normalizing) { | |
3bfba20d JH |
853 | ca.crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr); |
854 | ret |= crlf_to_worktree(path, src, len, dst, ca.crlf_action); | |
43dd2332 EB |
855 | if (ret) { |
856 | src = dst->buf; | |
857 | len = dst->len; | |
858 | } | |
aa4ed402 | 859 | } |
36daaaca | 860 | |
9035d75a | 861 | ret_filter = apply_filter(path, src, len, -1, dst, filter); |
36daaaca JB |
862 | if (!ret_filter && required) |
863 | die("%s: smudge filter %s failed", path, ca.drv->name); | |
864 | ||
865 | return ret | ret_filter; | |
35ebfd6a | 866 | } |
f217f0e8 | 867 | |
43dd2332 EB |
868 | int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst) |
869 | { | |
870 | return convert_to_working_tree_internal(path, src, len, dst, 0); | |
871 | } | |
872 | ||
f217f0e8 EB |
873 | int renormalize_buffer(const char *path, const char *src, size_t len, struct strbuf *dst) |
874 | { | |
43dd2332 | 875 | int ret = convert_to_working_tree_internal(path, src, len, dst, 1); |
f217f0e8 EB |
876 | if (ret) { |
877 | src = dst->buf; | |
878 | len = dst->len; | |
879 | } | |
7356b51e | 880 | return ret | convert_to_git(path, src, len, dst, SAFE_CRLF_FALSE); |
f217f0e8 | 881 | } |
dd8e9121 | 882 | |
b6691092 JH |
883 | /***************************************************************** |
884 | * | |
749f763d | 885 | * Streaming conversion support |
b6691092 JH |
886 | * |
887 | *****************************************************************/ | |
888 | ||
889 | typedef int (*filter_fn)(struct stream_filter *, | |
890 | const char *input, size_t *isize_p, | |
891 | char *output, size_t *osize_p); | |
892 | typedef void (*free_fn)(struct stream_filter *); | |
893 | ||
894 | struct stream_filter_vtbl { | |
895 | filter_fn filter; | |
896 | free_fn free; | |
897 | }; | |
898 | ||
899 | struct stream_filter { | |
900 | struct stream_filter_vtbl *vtbl; | |
901 | }; | |
902 | ||
903 | static int null_filter_fn(struct stream_filter *filter, | |
904 | const char *input, size_t *isize_p, | |
905 | char *output, size_t *osize_p) | |
906 | { | |
4ae66704 JH |
907 | size_t count; |
908 | ||
909 | if (!input) | |
910 | return 0; /* we do not keep any states */ | |
911 | count = *isize_p; | |
b6691092 JH |
912 | if (*osize_p < count) |
913 | count = *osize_p; | |
914 | if (count) { | |
915 | memmove(output, input, count); | |
916 | *isize_p -= count; | |
917 | *osize_p -= count; | |
918 | } | |
919 | return 0; | |
920 | } | |
921 | ||
922 | static void null_free_fn(struct stream_filter *filter) | |
923 | { | |
924 | ; /* nothing -- null instances are shared */ | |
925 | } | |
926 | ||
927 | static struct stream_filter_vtbl null_vtbl = { | |
928 | null_filter_fn, | |
929 | null_free_fn, | |
930 | }; | |
931 | ||
932 | static struct stream_filter null_filter_singleton = { | |
933 | &null_vtbl, | |
934 | }; | |
935 | ||
936 | int is_null_stream_filter(struct stream_filter *filter) | |
937 | { | |
938 | return filter == &null_filter_singleton; | |
939 | } | |
940 | ||
b84c7839 JH |
941 | |
942 | /* | |
943 | * LF-to-CRLF filter | |
944 | */ | |
284e3d28 CMN |
945 | |
946 | struct lf_to_crlf_filter { | |
947 | struct stream_filter filter; | |
8496f568 JH |
948 | unsigned has_held:1; |
949 | char held; | |
284e3d28 CMN |
950 | }; |
951 | ||
e322ee38 JH |
952 | static int lf_to_crlf_filter_fn(struct stream_filter *filter, |
953 | const char *input, size_t *isize_p, | |
954 | char *output, size_t *osize_p) | |
955 | { | |
284e3d28 CMN |
956 | size_t count, o = 0; |
957 | struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter; | |
958 | ||
8496f568 JH |
959 | /* |
960 | * We may be holding onto the CR to see if it is followed by a | |
961 | * LF, in which case we would need to go to the main loop. | |
962 | * Otherwise, just emit it to the output stream. | |
963 | */ | |
964 | if (lf_to_crlf->has_held && (lf_to_crlf->held != '\r' || !input)) { | |
965 | output[o++] = lf_to_crlf->held; | |
966 | lf_to_crlf->has_held = 0; | |
284e3d28 | 967 | } |
e322ee38 | 968 | |
87afe9a5 JH |
969 | /* We are told to drain */ |
970 | if (!input) { | |
971 | *osize_p -= o; | |
972 | return 0; | |
973 | } | |
e322ee38 | 974 | |
e322ee38 | 975 | count = *isize_p; |
8496f568 | 976 | if (count || lf_to_crlf->has_held) { |
284e3d28 | 977 | size_t i; |
8496f568 JH |
978 | int was_cr = 0; |
979 | ||
980 | if (lf_to_crlf->has_held) { | |
981 | was_cr = 1; | |
982 | lf_to_crlf->has_held = 0; | |
983 | } | |
984 | ||
284e3d28 | 985 | for (i = 0; o < *osize_p && i < count; i++) { |
e322ee38 | 986 | char ch = input[i]; |
8496f568 | 987 | |
e322ee38 | 988 | if (ch == '\n') { |
284e3d28 | 989 | output[o++] = '\r'; |
8496f568 JH |
990 | } else if (was_cr) { |
991 | /* | |
992 | * Previous round saw CR and it is not followed | |
993 | * by a LF; emit the CR before processing the | |
994 | * current character. | |
995 | */ | |
996 | output[o++] = '\r'; | |
e322ee38 | 997 | } |
8496f568 JH |
998 | |
999 | /* | |
1000 | * We may have consumed the last output slot, | |
1001 | * in which case we need to break out of this | |
1002 | * loop; hold the current character before | |
1003 | * returning. | |
1004 | */ | |
1005 | if (*osize_p <= o) { | |
1006 | lf_to_crlf->has_held = 1; | |
1007 | lf_to_crlf->held = ch; | |
1008 | continue; /* break but increment i */ | |
1009 | } | |
1010 | ||
1011 | if (ch == '\r') { | |
1012 | was_cr = 1; | |
1013 | continue; | |
1014 | } | |
1015 | ||
1016 | was_cr = 0; | |
e322ee38 JH |
1017 | output[o++] = ch; |
1018 | } | |
1019 | ||
1020 | *osize_p -= o; | |
1021 | *isize_p -= i; | |
8496f568 JH |
1022 | |
1023 | if (!lf_to_crlf->has_held && was_cr) { | |
1024 | lf_to_crlf->has_held = 1; | |
1025 | lf_to_crlf->held = '\r'; | |
1026 | } | |
e322ee38 JH |
1027 | } |
1028 | return 0; | |
1029 | } | |
1030 | ||
284e3d28 CMN |
1031 | static void lf_to_crlf_free_fn(struct stream_filter *filter) |
1032 | { | |
1033 | free(filter); | |
1034 | } | |
1035 | ||
e322ee38 JH |
1036 | static struct stream_filter_vtbl lf_to_crlf_vtbl = { |
1037 | lf_to_crlf_filter_fn, | |
284e3d28 | 1038 | lf_to_crlf_free_fn, |
e322ee38 JH |
1039 | }; |
1040 | ||
284e3d28 CMN |
1041 | static struct stream_filter *lf_to_crlf_filter(void) |
1042 | { | |
87afe9a5 | 1043 | struct lf_to_crlf_filter *lf_to_crlf = xcalloc(1, sizeof(*lf_to_crlf)); |
e322ee38 | 1044 | |
284e3d28 | 1045 | lf_to_crlf->filter.vtbl = &lf_to_crlf_vtbl; |
284e3d28 CMN |
1046 | return (struct stream_filter *)lf_to_crlf; |
1047 | } | |
b84c7839 | 1048 | |
a265a7f9 JH |
1049 | /* |
1050 | * Cascade filter | |
1051 | */ | |
1052 | #define FILTER_BUFFER 1024 | |
1053 | struct cascade_filter { | |
1054 | struct stream_filter filter; | |
1055 | struct stream_filter *one; | |
1056 | struct stream_filter *two; | |
1057 | char buf[FILTER_BUFFER]; | |
1058 | int end, ptr; | |
1059 | }; | |
1060 | ||
1061 | static int cascade_filter_fn(struct stream_filter *filter, | |
1062 | const char *input, size_t *isize_p, | |
1063 | char *output, size_t *osize_p) | |
1064 | { | |
1065 | struct cascade_filter *cas = (struct cascade_filter *) filter; | |
1066 | size_t filled = 0; | |
1067 | size_t sz = *osize_p; | |
1068 | size_t to_feed, remaining; | |
1069 | ||
1070 | /* | |
1071 | * input -- (one) --> buf -- (two) --> output | |
1072 | */ | |
1073 | while (filled < sz) { | |
1074 | remaining = sz - filled; | |
1075 | ||
1076 | /* do we already have something to feed two with? */ | |
1077 | if (cas->ptr < cas->end) { | |
1078 | to_feed = cas->end - cas->ptr; | |
1079 | if (stream_filter(cas->two, | |
1080 | cas->buf + cas->ptr, &to_feed, | |
1081 | output + filled, &remaining)) | |
1082 | return -1; | |
1083 | cas->ptr += (cas->end - cas->ptr) - to_feed; | |
1084 | filled = sz - remaining; | |
1085 | continue; | |
1086 | } | |
1087 | ||
1088 | /* feed one from upstream and have it emit into our buffer */ | |
1089 | to_feed = input ? *isize_p : 0; | |
1090 | if (input && !to_feed) | |
1091 | break; | |
1092 | remaining = sizeof(cas->buf); | |
1093 | if (stream_filter(cas->one, | |
1094 | input, &to_feed, | |
1095 | cas->buf, &remaining)) | |
1096 | return -1; | |
1097 | cas->end = sizeof(cas->buf) - remaining; | |
1098 | cas->ptr = 0; | |
1099 | if (input) { | |
1100 | size_t fed = *isize_p - to_feed; | |
1101 | *isize_p -= fed; | |
1102 | input += fed; | |
1103 | } | |
1104 | ||
1105 | /* do we know that we drained one completely? */ | |
1106 | if (input || cas->end) | |
1107 | continue; | |
1108 | ||
1109 | /* tell two to drain; we have nothing more to give it */ | |
1110 | to_feed = 0; | |
1111 | remaining = sz - filled; | |
1112 | if (stream_filter(cas->two, | |
1113 | NULL, &to_feed, | |
1114 | output + filled, &remaining)) | |
1115 | return -1; | |
1116 | if (remaining == (sz - filled)) | |
1117 | break; /* completely drained two */ | |
1118 | filled = sz - remaining; | |
1119 | } | |
1120 | *osize_p -= filled; | |
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | static void cascade_free_fn(struct stream_filter *filter) | |
1125 | { | |
1126 | struct cascade_filter *cas = (struct cascade_filter *)filter; | |
1127 | free_stream_filter(cas->one); | |
1128 | free_stream_filter(cas->two); | |
1129 | free(filter); | |
1130 | } | |
1131 | ||
1132 | static struct stream_filter_vtbl cascade_vtbl = { | |
1133 | cascade_filter_fn, | |
1134 | cascade_free_fn, | |
1135 | }; | |
1136 | ||
1137 | static struct stream_filter *cascade_filter(struct stream_filter *one, | |
1138 | struct stream_filter *two) | |
1139 | { | |
1140 | struct cascade_filter *cascade; | |
1141 | ||
1142 | if (!one || is_null_stream_filter(one)) | |
1143 | return two; | |
1144 | if (!two || is_null_stream_filter(two)) | |
1145 | return one; | |
1146 | ||
1147 | cascade = xmalloc(sizeof(*cascade)); | |
1148 | cascade->one = one; | |
1149 | cascade->two = two; | |
1150 | cascade->end = cascade->ptr = 0; | |
1151 | cascade->filter.vtbl = &cascade_vtbl; | |
1152 | return (struct stream_filter *)cascade; | |
1153 | } | |
1154 | ||
b84c7839 JH |
1155 | /* |
1156 | * ident filter | |
1157 | */ | |
1158 | #define IDENT_DRAINING (-1) | |
1159 | #define IDENT_SKIPPING (-2) | |
1160 | struct ident_filter { | |
1161 | struct stream_filter filter; | |
1162 | struct strbuf left; | |
1163 | int state; | |
1164 | char ident[45]; /* ": x40 $" */ | |
1165 | }; | |
1166 | ||
1167 | static int is_foreign_ident(const char *str) | |
1168 | { | |
1169 | int i; | |
1170 | ||
ae021d87 | 1171 | if (!skip_prefix(str, "$Id: ", &str)) |
b84c7839 | 1172 | return 0; |
ae021d87 | 1173 | for (i = 0; str[i]; i++) { |
b84c7839 JH |
1174 | if (isspace(str[i]) && str[i+1] != '$') |
1175 | return 1; | |
1176 | } | |
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | static void ident_drain(struct ident_filter *ident, char **output_p, size_t *osize_p) | |
1181 | { | |
1182 | size_t to_drain = ident->left.len; | |
1183 | ||
1184 | if (*osize_p < to_drain) | |
1185 | to_drain = *osize_p; | |
1186 | if (to_drain) { | |
1187 | memcpy(*output_p, ident->left.buf, to_drain); | |
1188 | strbuf_remove(&ident->left, 0, to_drain); | |
1189 | *output_p += to_drain; | |
1190 | *osize_p -= to_drain; | |
1191 | } | |
1192 | if (!ident->left.len) | |
1193 | ident->state = 0; | |
1194 | } | |
1195 | ||
1196 | static int ident_filter_fn(struct stream_filter *filter, | |
1197 | const char *input, size_t *isize_p, | |
1198 | char *output, size_t *osize_p) | |
1199 | { | |
1200 | struct ident_filter *ident = (struct ident_filter *)filter; | |
1201 | static const char head[] = "$Id"; | |
1202 | ||
1203 | if (!input) { | |
1204 | /* drain upon eof */ | |
1205 | switch (ident->state) { | |
1206 | default: | |
1207 | strbuf_add(&ident->left, head, ident->state); | |
1208 | case IDENT_SKIPPING: | |
1209 | /* fallthru */ | |
1210 | case IDENT_DRAINING: | |
1211 | ident_drain(ident, &output, osize_p); | |
1212 | } | |
1213 | return 0; | |
1214 | } | |
1215 | ||
1216 | while (*isize_p || (ident->state == IDENT_DRAINING)) { | |
1217 | int ch; | |
1218 | ||
1219 | if (ident->state == IDENT_DRAINING) { | |
1220 | ident_drain(ident, &output, osize_p); | |
1221 | if (!*osize_p) | |
1222 | break; | |
1223 | continue; | |
1224 | } | |
1225 | ||
1226 | ch = *(input++); | |
1227 | (*isize_p)--; | |
1228 | ||
1229 | if (ident->state == IDENT_SKIPPING) { | |
1230 | /* | |
1231 | * Skipping until '$' or LF, but keeping them | |
1232 | * in case it is a foreign ident. | |
1233 | */ | |
1234 | strbuf_addch(&ident->left, ch); | |
1235 | if (ch != '\n' && ch != '$') | |
1236 | continue; | |
1237 | if (ch == '$' && !is_foreign_ident(ident->left.buf)) { | |
1238 | strbuf_setlen(&ident->left, sizeof(head) - 1); | |
1239 | strbuf_addstr(&ident->left, ident->ident); | |
1240 | } | |
1241 | ident->state = IDENT_DRAINING; | |
1242 | continue; | |
1243 | } | |
1244 | ||
1245 | if (ident->state < sizeof(head) && | |
1246 | head[ident->state] == ch) { | |
1247 | ident->state++; | |
1248 | continue; | |
1249 | } | |
1250 | ||
1251 | if (ident->state) | |
1252 | strbuf_add(&ident->left, head, ident->state); | |
1253 | if (ident->state == sizeof(head) - 1) { | |
1254 | if (ch != ':' && ch != '$') { | |
1255 | strbuf_addch(&ident->left, ch); | |
1256 | ident->state = 0; | |
1257 | continue; | |
1258 | } | |
1259 | ||
1260 | if (ch == ':') { | |
1261 | strbuf_addch(&ident->left, ch); | |
1262 | ident->state = IDENT_SKIPPING; | |
1263 | } else { | |
1264 | strbuf_addstr(&ident->left, ident->ident); | |
1265 | ident->state = IDENT_DRAINING; | |
1266 | } | |
1267 | continue; | |
1268 | } | |
1269 | ||
1270 | strbuf_addch(&ident->left, ch); | |
1271 | ident->state = IDENT_DRAINING; | |
1272 | } | |
1273 | return 0; | |
1274 | } | |
1275 | ||
1276 | static void ident_free_fn(struct stream_filter *filter) | |
1277 | { | |
1278 | struct ident_filter *ident = (struct ident_filter *)filter; | |
1279 | strbuf_release(&ident->left); | |
1280 | free(filter); | |
1281 | } | |
1282 | ||
1283 | static struct stream_filter_vtbl ident_vtbl = { | |
1284 | ident_filter_fn, | |
1285 | ident_free_fn, | |
1286 | }; | |
1287 | ||
1288 | static struct stream_filter *ident_filter(const unsigned char *sha1) | |
1289 | { | |
1290 | struct ident_filter *ident = xmalloc(sizeof(*ident)); | |
1291 | ||
1292 | sprintf(ident->ident, ": %s $", sha1_to_hex(sha1)); | |
1293 | strbuf_init(&ident->left, 0); | |
1294 | ident->filter.vtbl = &ident_vtbl; | |
1295 | ident->state = 0; | |
1296 | return (struct stream_filter *)ident; | |
1297 | } | |
1298 | ||
dd8e9121 | 1299 | /* |
b6691092 JH |
1300 | * Return an appropriately constructed filter for the path, or NULL if |
1301 | * the contents cannot be filtered without reading the whole thing | |
1302 | * in-core. | |
1303 | * | |
1304 | * Note that you would be crazy to set CRLF, smuge/clean or ident to a | |
1305 | * large binary blob you would want us not to slurp into the memory! | |
dd8e9121 | 1306 | */ |
b6691092 | 1307 | struct stream_filter *get_stream_filter(const char *path, const unsigned char *sha1) |
dd8e9121 JH |
1308 | { |
1309 | struct conv_attrs ca; | |
1310 | enum crlf_action crlf_action; | |
b84c7839 | 1311 | struct stream_filter *filter = NULL; |
dd8e9121 JH |
1312 | |
1313 | convert_attrs(&ca, path); | |
1314 | ||
b84c7839 JH |
1315 | if (ca.drv && (ca.drv->smudge || ca.drv->clean)) |
1316 | return filter; | |
1317 | ||
1318 | if (ca.ident) | |
1319 | filter = ident_filter(sha1); | |
dd8e9121 JH |
1320 | |
1321 | crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr); | |
b84c7839 | 1322 | |
b0d9c69f | 1323 | if ((crlf_action == CRLF_BINARY) || (crlf_action == CRLF_INPUT) || |
a265a7f9 JH |
1324 | (crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE)) |
1325 | filter = cascade_filter(filter, &null_filter_singleton); | |
1326 | ||
1327 | else if (output_eol(crlf_action) == EOL_CRLF && | |
1328 | !(crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS)) | |
284e3d28 | 1329 | filter = cascade_filter(filter, lf_to_crlf_filter()); |
e322ee38 | 1330 | |
b84c7839 | 1331 | return filter; |
b6691092 JH |
1332 | } |
1333 | ||
1334 | void free_stream_filter(struct stream_filter *filter) | |
1335 | { | |
1336 | filter->vtbl->free(filter); | |
1337 | } | |
1338 | ||
1339 | int stream_filter(struct stream_filter *filter, | |
1340 | const char *input, size_t *isize_p, | |
1341 | char *output, size_t *osize_p) | |
1342 | { | |
1343 | return filter->vtbl->filter(filter, input, isize_p, output, osize_p); | |
dd8e9121 | 1344 | } |