convert: prepare filter.<driver>.process option
[git/git.git] / convert.c
CommitLineData
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
a7630bd4
TB
16/* Stat bits: When BIN is set, the txt bits are unset */
17#define CONVERT_STAT_BITS_TXT_LF 0x1
18#define CONVERT_STAT_BITS_TXT_CRLF 0x2
19#define CONVERT_STAT_BITS_BIN 0x4
20
c61dcff9 21enum crlf_action {
df747b81
TB
22 CRLF_UNDEFINED,
23 CRLF_BINARY,
fd6cce9e 24 CRLF_TEXT,
df747b81
TB
25 CRLF_TEXT_INPUT,
26 CRLF_TEXT_CRLF,
27 CRLF_AUTO,
28 CRLF_AUTO_INPUT,
29 CRLF_AUTO_CRLF
fd6cce9e 30};
163b9591 31
6c510bee 32struct text_stat {
28624193 33 /* NUL, CR, LF and CRLF counts */
6e336a53 34 unsigned nul, lonecr, lonelf, crlf;
6c510bee
LT
35
36 /* These are just approximations! */
37 unsigned printable, nonprintable;
38};
39
40static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats)
41{
42 unsigned long i;
43
44 memset(stats, 0, sizeof(*stats));
45
46 for (i = 0; i < size; i++) {
47 unsigned char c = buf[i];
48 if (c == '\r') {
6e336a53 49 if (i+1 < size && buf[i+1] == '\n') {
6c510bee 50 stats->crlf++;
6e336a53
TB
51 i++;
52 } else
53 stats->lonecr++;
6c510bee
LT
54 continue;
55 }
56 if (c == '\n') {
6e336a53 57 stats->lonelf++;
6c510bee
LT
58 continue;
59 }
60 if (c == 127)
61 /* DEL */
62 stats->nonprintable++;
63 else if (c < 32) {
64 switch (c) {
65 /* BS, HT, ESC and FF */
66 case '\b': case '\t': case '\033': case '\014':
67 stats->printable++;
68 break;
28624193
DP
69 case 0:
70 stats->nul++;
71 /* fall through */
6c510bee
LT
72 default:
73 stats->nonprintable++;
74 }
75 }
76 else
77 stats->printable++;
78 }
f9dd4bf4
DK
79
80 /* If file ends with EOF then don't count this EOF as non-printable. */
81 if (size >= 1 && buf[size-1] == '\032')
82 stats->nonprintable--;
6c510bee
LT
83}
84
85/*
86 * The same heuristics as diff.c::mmfile_is_binary()
a7630bd4 87 * We treat files with bare CR as binary
6c510bee 88 */
a7630bd4 89static int convert_is_binary(unsigned long size, const struct text_stat *stats)
6c510bee 90{
6e336a53 91 if (stats->lonecr)
a7630bd4 92 return 1;
28624193
DP
93 if (stats->nul)
94 return 1;
6c510bee
LT
95 if ((stats->printable >> 7) < stats->nonprintable)
96 return 1;
6c510bee
LT
97 return 0;
98}
99
a7630bd4
TB
100static unsigned int gather_convert_stats(const char *data, unsigned long size)
101{
102 struct text_stat stats;
6e336a53 103 int ret = 0;
a7630bd4
TB
104 if (!data || !size)
105 return 0;
106 gather_stats(data, size, &stats);
107 if (convert_is_binary(size, &stats))
6e336a53
TB
108 ret |= CONVERT_STAT_BITS_BIN;
109 if (stats.crlf)
110 ret |= CONVERT_STAT_BITS_TXT_CRLF;
111 if (stats.lonelf)
112 ret |= CONVERT_STAT_BITS_TXT_LF;
113
114 return ret;
a7630bd4
TB
115}
116
117static const char *gather_convert_stats_ascii(const char *data, unsigned long size)
118{
119 unsigned int convert_stats = gather_convert_stats(data, size);
120
121 if (convert_stats & CONVERT_STAT_BITS_BIN)
122 return "-text";
123 switch (convert_stats) {
124 case CONVERT_STAT_BITS_TXT_LF:
125 return "lf";
126 case CONVERT_STAT_BITS_TXT_CRLF:
127 return "crlf";
128 case CONVERT_STAT_BITS_TXT_LF | CONVERT_STAT_BITS_TXT_CRLF:
129 return "mixed";
130 default:
131 return "none";
132 }
133}
134
135const char *get_cached_convert_stats_ascii(const char *path)
136{
137 const char *ret;
138 unsigned long sz;
139 void *data = read_blob_data_from_cache(path, &sz);
140 ret = gather_convert_stats_ascii(data, sz);
141 free(data);
142 return ret;
143}
144
145const char *get_wt_convert_stats_ascii(const char *path)
146{
147 const char *ret = "";
148 struct strbuf sb = STRBUF_INIT;
149 if (strbuf_read_file(&sb, path, 0) >= 0)
150 ret = gather_convert_stats_ascii(sb.buf, sb.len);
151 strbuf_release(&sb);
152 return ret;
153}
154
4b4024f5
TB
155static int text_eol_is_crlf(void)
156{
157 if (auto_crlf == AUTO_CRLF_TRUE)
158 return 1;
159 else if (auto_crlf == AUTO_CRLF_INPUT)
160 return 0;
161 if (core_eol == EOL_CRLF)
162 return 1;
163 if (core_eol == EOL_UNSET && EOL_NATIVE == EOL_CRLF)
164 return 1;
165 return 0;
166}
167
c61dcff9 168static enum eol output_eol(enum crlf_action crlf_action)
f217f0e8 169{
c61dcff9 170 switch (crlf_action) {
942e7747
EB
171 case CRLF_BINARY:
172 return EOL_UNSET;
df747b81 173 case CRLF_TEXT_CRLF:
942e7747 174 return EOL_CRLF;
df747b81 175 case CRLF_TEXT_INPUT:
942e7747 176 return EOL_LF;
df747b81
TB
177 case CRLF_UNDEFINED:
178 case CRLF_AUTO_CRLF:
65237284 179 return EOL_CRLF;
df747b81 180 case CRLF_AUTO_INPUT:
65237284 181 return EOL_LF;
942e7747
EB
182 case CRLF_TEXT:
183 case CRLF_AUTO:
df747b81 184 /* fall through */
4b4024f5 185 return text_eol_is_crlf() ? EOL_CRLF : EOL_LF;
942e7747 186 }
df747b81 187 warning("Illegal crlf_action %d\n", (int)crlf_action);
ec70f52f 188 return core_eol;
942e7747
EB
189}
190
c61dcff9 191static void check_safe_crlf(const char *path, enum crlf_action crlf_action,
a0ad53c1
TB
192 struct text_stat *old_stats, struct text_stat *new_stats,
193 enum safe_crlf checksafe)
21e5ad50 194{
a0ad53c1 195 if (old_stats->crlf && !new_stats->crlf ) {
21e5ad50 196 /*
a0ad53c1 197 * CRLFs would not be restored by checkout
21e5ad50 198 */
a0ad53c1
TB
199 if (checksafe == SAFE_CRLF_WARN)
200 warning("CRLF will be replaced by LF in %s.\nThe file will have its original line endings in your working directory.", path);
201 else /* i.e. SAFE_CRLF_FAIL */
202 die("CRLF would be replaced by LF in %s.", path);
203 } else if (old_stats->lonelf && !new_stats->lonelf ) {
21e5ad50 204 /*
a0ad53c1 205 * CRLFs would be added by checkout
21e5ad50 206 */
a0ad53c1
TB
207 if (checksafe == SAFE_CRLF_WARN)
208 warning("LF will be replaced by CRLF in %s.\nThe file will have its original line endings in your working directory.", path);
209 else /* i.e. SAFE_CRLF_FAIL */
210 die("LF would be replaced by CRLF in %s", path);
21e5ad50
SP
211 }
212}
213
c4805393
FAG
214static int has_cr_in_index(const char *path)
215{
c4805393 216 unsigned long sz;
c4805393
FAG
217 void *data;
218 int has_cr;
c4805393 219
4982fd78
LF
220 data = read_blob_data_from_cache(path, &sz);
221 if (!data)
c4805393 222 return 0;
c4805393
FAG
223 has_cr = memchr(data, '\r', sz) != NULL;
224 free(data);
225 return has_cr;
226}
227
a0ad53c1
TB
228static int will_convert_lf_to_crlf(size_t len, struct text_stat *stats,
229 enum crlf_action crlf_action)
230{
231 if (output_eol(crlf_action) != EOL_CRLF)
232 return 0;
233 /* No "naked" LF? Nothing to convert, regardless. */
234 if (!stats->lonelf)
235 return 0;
236
237 if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) {
238 /* If we have any CR or CRLF line endings, we do not touch it */
239 /* This is the new safer autocrlf-handling */
240 if (stats->lonecr || stats->crlf)
241 return 0;
242
243 if (convert_is_binary(len, stats))
244 return 0;
245 }
246 return 1;
247
248}
249
5ecd293d 250static int crlf_to_git(const char *path, const char *src, size_t len,
c61dcff9
JH
251 struct strbuf *buf,
252 enum crlf_action crlf_action, enum safe_crlf checksafe)
6c510bee 253{
6c510bee 254 struct text_stat stats;
5ecd293d 255 char *dst;
a0ad53c1 256 int convert_crlf_into_lf;
6c510bee 257
c61dcff9 258 if (crlf_action == CRLF_BINARY ||
4c3b57b9 259 (src && !len))
5ecd293d 260 return 0;
6c510bee 261
4c3b57b9
JK
262 /*
263 * If we are doing a dry-run and have no source buffer, there is
264 * nothing to analyze; we must assume we would convert.
265 */
266 if (!buf && !src)
267 return 1;
268
5ecd293d 269 gather_stats(src, len, &stats);
a0ad53c1
TB
270 /* Optimization: No CRLF? Nothing to convert, regardless. */
271 convert_crlf_into_lf = !!stats.crlf;
6c510bee 272
df747b81 273 if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) {
a7630bd4 274 if (convert_is_binary(len, &stats))
5ecd293d 275 return 0;
65237284
TB
276 /*
277 * If the file in the index has any CR in it, do not convert.
278 * This is the new safer autocrlf handling.
279 */
280 if (checksafe == SAFE_CRLF_RENORMALIZE)
281 checksafe = SAFE_CRLF_FALSE;
282 else if (has_cr_in_index(path))
a0ad53c1 283 convert_crlf_into_lf = 0;
201ac8ef 284 }
a0ad53c1
TB
285 if (checksafe && len) {
286 struct text_stat new_stats;
287 memcpy(&new_stats, &stats, sizeof(new_stats));
288 /* simulate "git add" */
289 if (convert_crlf_into_lf) {
290 new_stats.lonelf += new_stats.crlf;
291 new_stats.crlf = 0;
292 }
293 /* simulate "git checkout" */
294 if (will_convert_lf_to_crlf(len, &new_stats, crlf_action)) {
295 new_stats.crlf += new_stats.lonelf;
296 new_stats.lonelf = 0;
297 }
298 check_safe_crlf(path, crlf_action, &stats, &new_stats, checksafe);
299 }
300 if (!convert_crlf_into_lf)
21e5ad50
SP
301 return 0;
302
92ac3197
JK
303 /*
304 * At this point all of our source analysis is done, and we are sure we
305 * would convert. If we are in dry-run mode, we can give an answer.
306 */
307 if (!buf)
308 return 1;
309
90d16ec0
PH
310 /* only grow if not in place */
311 if (strbuf_avail(buf) + buf->len < len)
312 strbuf_grow(buf, len - buf->len);
5ecd293d 313 dst = buf->buf;
df747b81 314 if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) {
163b9591
JH
315 /*
316 * If we guessed, we already know we rejected a file with
317 * lone CR, and we can strip a CR without looking at what
318 * follow it.
319 */
201ac8ef 320 do {
ac78e548 321 unsigned char c = *src++;
201ac8ef 322 if (c != '\r')
ac78e548 323 *dst++ = c;
5ecd293d 324 } while (--len);
201ac8ef
JH
325 } else {
326 do {
ac78e548 327 unsigned char c = *src++;
5ecd293d 328 if (! (c == '\r' && (1 < len && *src == '\n')))
ac78e548 329 *dst++ = c;
5ecd293d 330 } while (--len);
201ac8ef 331 }
5ecd293d
PH
332 strbuf_setlen(buf, dst - buf->buf);
333 return 1;
6c510bee
LT
334}
335
5ecd293d 336static int crlf_to_worktree(const char *path, const char *src, size_t len,
c61dcff9 337 struct strbuf *buf, enum crlf_action crlf_action)
6c510bee 338{
5ecd293d 339 char *to_free = NULL;
6c510bee 340 struct text_stat stats;
6c510bee 341
c61dcff9 342 if (!len || output_eol(crlf_action) != EOL_CRLF)
5ecd293d 343 return 0;
6c510bee 344
5ecd293d 345 gather_stats(src, len, &stats);
a0ad53c1 346 if (!will_convert_lf_to_crlf(len, &stats, crlf_action))
5ecd293d 347 return 0;
6c510bee 348
5ecd293d
PH
349 /* are we "faking" in place editing ? */
350 if (src == buf->buf)
b315c5c0 351 to_free = strbuf_detach(buf, NULL);
5ecd293d 352
6e336a53 353 strbuf_grow(buf, len + stats.lonelf);
5ecd293d
PH
354 for (;;) {
355 const char *nl = memchr(src, '\n', len);
356 if (!nl)
357 break;
358 if (nl > src && nl[-1] == '\r') {
359 strbuf_add(buf, src, nl + 1 - src);
360 } else {
361 strbuf_add(buf, src, nl - src);
362 strbuf_addstr(buf, "\r\n");
363 }
364 len -= nl + 1 - src;
365 src = nl + 1;
366 }
367 strbuf_add(buf, src, len);
368
369 free(to_free);
370 return 1;
6c510bee 371}
35ebfd6a 372
546bb582
JS
373struct filter_params {
374 const char *src;
375 unsigned long size;
9035d75a 376 int fd;
546bb582 377 const char *cmd;
a2b665de 378 const char *path;
546bb582
JS
379};
380
9035d75a 381static int filter_buffer_or_fd(int in, int out, void *data)
aa4ed402
JH
382{
383 /*
384 * Spawn cmd and feed the buffer contents through its stdin.
385 */
d3180279 386 struct child_process child_process = CHILD_PROCESS_INIT;
546bb582 387 struct filter_params *params = (struct filter_params *)data;
aa4ed402 388 int write_err, status;
66dbfd55
GV
389 const char *argv[] = { NULL, NULL };
390
a2b665de
PW
391 /* apply % substitution to cmd */
392 struct strbuf cmd = STRBUF_INIT;
393 struct strbuf path = STRBUF_INIT;
394 struct strbuf_expand_dict_entry dict[] = {
395 { "f", NULL, },
396 { NULL, NULL, },
397 };
398
399 /* quote the path to preserve spaces, etc. */
400 sq_quote_buf(&path, params->path);
401 dict[0].value = path.buf;
402
403 /* expand all %f with the quoted path */
404 strbuf_expand(&cmd, params->cmd, strbuf_expand_dict_cb, &dict);
405 strbuf_release(&path);
406
407 argv[0] = cmd.buf;
aa4ed402 408
dc1bfdcd 409 child_process.argv = argv;
ac0ba18d 410 child_process.use_shell = 1;
dc1bfdcd 411 child_process.in = -1;
ae6a5609 412 child_process.out = out;
aa4ed402 413
dc1bfdcd 414 if (start_command(&child_process))
255f04d6 415 return error("cannot fork to run external filter '%s'", params->cmd);
aa4ed402 416
6424c2ad
JB
417 sigchain_push(SIGPIPE, SIG_IGN);
418
9035d75a 419 if (params->src) {
0c4dd67a
JH
420 write_err = (write_in_full(child_process.in,
421 params->src, params->size) < 0);
422 if (errno == EPIPE)
423 write_err = 0;
9035d75a
SP
424 } else {
425 write_err = copy_fd(params->fd, child_process.in);
0c4dd67a
JH
426 if (write_err == COPY_WRITE_ERROR && errno == EPIPE)
427 write_err = 0;
9035d75a
SP
428 }
429
dc1bfdcd 430 if (close(child_process.in))
aa4ed402
JH
431 write_err = 1;
432 if (write_err)
255f04d6 433 error("cannot feed the input to external filter '%s'", params->cmd);
aa4ed402 434
6424c2ad
JB
435 sigchain_pop(SIGPIPE);
436
aa4ed402
JH
437 status = finish_command(&child_process);
438 if (status)
255f04d6 439 error("external filter '%s' failed %d", params->cmd, status);
a2b665de
PW
440
441 strbuf_release(&cmd);
aa4ed402
JH
442 return (write_err || status);
443}
444
234fa07e 445static int apply_single_file_filter(const char *path, const char *src, size_t len, int fd,
5ecd293d 446 struct strbuf *dst, const char *cmd)
aa4ed402
JH
447{
448 /*
449 * Create a pipeline to have the command filter the buffer's
450 * contents.
451 *
452 * (child --> cmd) --> us
453 */
b84be553 454 int err = 0;
f285a2d7 455 struct strbuf nbuf = STRBUF_INIT;
546bb582
JS
456 struct async async;
457 struct filter_params params;
aa4ed402 458
546bb582 459 memset(&async, 0, sizeof(async));
9035d75a 460 async.proc = filter_buffer_or_fd;
546bb582 461 async.data = &params;
ae6a5609 462 async.out = -1;
546bb582
JS
463 params.src = src;
464 params.size = len;
9035d75a 465 params.fd = fd;
546bb582 466 params.cmd = cmd;
a2b665de 467 params.path = path;
aa4ed402
JH
468
469 fflush(NULL);
546bb582
JS
470 if (start_async(&async))
471 return 0; /* error was already reported */
aa4ed402 472
546bb582 473 if (strbuf_read(&nbuf, async.out, len) < 0) {
b84be553 474 err = error("read from external filter '%s' failed", cmd);
aa4ed402 475 }
546bb582 476 if (close(async.out)) {
b84be553 477 err = error("read from external filter '%s' failed", cmd);
aa4ed402 478 }
546bb582 479 if (finish_async(&async)) {
b84be553 480 err = error("external filter '%s' failed", cmd);
aa4ed402
JH
481 }
482
b84be553 483 if (!err) {
90d16ec0 484 strbuf_swap(dst, &nbuf);
5ecd293d 485 }
90d16ec0 486 strbuf_release(&nbuf);
b84be553 487 return !err;
aa4ed402
JH
488}
489
234fa07e
LS
490#define CAP_CLEAN (1u<<0)
491#define CAP_SMUDGE (1u<<1)
492
aa4ed402
JH
493static struct convert_driver {
494 const char *name;
495 struct convert_driver *next;
cd8be6c9
BH
496 const char *smudge;
497 const char *clean;
36daaaca 498 int required;
aa4ed402
JH
499} *user_convert, **user_convert_tail;
500
234fa07e
LS
501static int apply_filter(const char *path, const char *src, size_t len,
502 int fd, struct strbuf *dst, struct convert_driver *drv,
503 const unsigned int wanted_capability)
504{
505 const char *cmd = NULL;
506
507 if (!drv)
508 return 0;
509
510 if (!dst)
511 return 1;
512
513 if ((CAP_CLEAN & wanted_capability) && drv->clean)
514 cmd = drv->clean;
515 else if ((CAP_SMUDGE & wanted_capability) && drv->smudge)
516 cmd = drv->smudge;
517
518 if (cmd && *cmd)
519 return apply_single_file_filter(path, src, len, fd, dst, cmd);
520
521 return 0;
522}
523
ef90d6d4 524static int read_convert_config(const char *var, const char *value, void *cb)
aa4ed402 525{
d731f0ad 526 const char *key, *name;
aa4ed402
JH
527 int namelen;
528 struct convert_driver *drv;
529
530 /*
531 * External conversion drivers are configured using
532 * "filter.<name>.variable".
533 */
d731f0ad 534 if (parse_config_key(var, "filter", &name, &namelen, &key) < 0 || !name)
aa4ed402 535 return 0;
aa4ed402
JH
536 for (drv = user_convert; drv; drv = drv->next)
537 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
538 break;
539 if (!drv) {
aa4ed402 540 drv = xcalloc(1, sizeof(struct convert_driver));
182af834 541 drv->name = xmemdupz(name, namelen);
aa4ed402
JH
542 *user_convert_tail = drv;
543 user_convert_tail = &(drv->next);
544 }
545
aa4ed402
JH
546 /*
547 * filter.<name>.smudge and filter.<name>.clean specifies
548 * the command line:
549 *
550 * command-line
551 *
552 * The command-line will not be interpolated in any way.
553 */
554
d731f0ad 555 if (!strcmp("smudge", key))
cd8be6c9
BH
556 return git_config_string(&drv->smudge, var, value);
557
d731f0ad 558 if (!strcmp("clean", key))
cd8be6c9 559 return git_config_string(&drv->clean, var, value);
aa4ed402 560
d731f0ad 561 if (!strcmp("required", key)) {
36daaaca
JB
562 drv->required = git_config_bool(var, value);
563 return 0;
564 }
565
aa4ed402
JH
566 return 0;
567}
568
3fed15f5
JH
569static int count_ident(const char *cp, unsigned long size)
570{
571 /*
af9b54bb 572 * "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$"
3fed15f5
JH
573 */
574 int cnt = 0;
575 char ch;
576
577 while (size) {
578 ch = *cp++;
579 size--;
580 if (ch != '$')
581 continue;
af9b54bb 582 if (size < 3)
3fed15f5 583 break;
af9b54bb 584 if (memcmp("Id", cp, 2))
3fed15f5 585 continue;
af9b54bb
AP
586 ch = cp[2];
587 cp += 3;
588 size -= 3;
3fed15f5 589 if (ch == '$')
af9b54bb 590 cnt++; /* $Id$ */
3fed15f5
JH
591 if (ch != ':')
592 continue;
593
594 /*
af9b54bb 595 * "$Id: ... "; scan up to the closing dollar sign and discard.
3fed15f5
JH
596 */
597 while (size) {
598 ch = *cp++;
599 size--;
600 if (ch == '$') {
601 cnt++;
602 break;
603 }
a9f3049f
HG
604 if (ch == '\n')
605 break;
3fed15f5
JH
606 }
607 }
608 return cnt;
609}
610
5ecd293d
PH
611static int ident_to_git(const char *path, const char *src, size_t len,
612 struct strbuf *buf, int ident)
3fed15f5 613{
5ecd293d 614 char *dst, *dollar;
3fed15f5 615
4c3b57b9 616 if (!ident || (src && !count_ident(src, len)))
5ecd293d
PH
617 return 0;
618
92ac3197
JK
619 if (!buf)
620 return 1;
621
90d16ec0
PH
622 /* only grow if not in place */
623 if (strbuf_avail(buf) + buf->len < len)
624 strbuf_grow(buf, len - buf->len);
5ecd293d
PH
625 dst = buf->buf;
626 for (;;) {
627 dollar = memchr(src, '$', len);
628 if (!dollar)
629 break;
77321184 630 memmove(dst, src, dollar + 1 - src);
5ecd293d
PH
631 dst += dollar + 1 - src;
632 len -= dollar + 1 - src;
633 src = dollar + 1;
634
635 if (len > 3 && !memcmp(src, "Id:", 3)) {
636 dollar = memchr(src + 3, '$', len - 3);
637 if (!dollar)
638 break;
a9f3049f
HG
639 if (memchr(src + 3, '\n', dollar - src - 3)) {
640 /* Line break before the next dollar. */
641 continue;
642 }
643
af9b54bb
AP
644 memcpy(dst, "Id$", 3);
645 dst += 3;
5ecd293d
PH
646 len -= dollar + 1 - src;
647 src = dollar + 1;
3fed15f5
JH
648 }
649 }
77321184 650 memmove(dst, src, len);
5ecd293d
PH
651 strbuf_setlen(buf, dst + len - buf->buf);
652 return 1;
3fed15f5
JH
653}
654
5ecd293d
PH
655static int ident_to_worktree(const char *path, const char *src, size_t len,
656 struct strbuf *buf, int ident)
3fed15f5 657{
3fed15f5 658 unsigned char sha1[20];
07814d90 659 char *to_free = NULL, *dollar, *spc;
5ecd293d 660 int cnt;
3fed15f5
JH
661
662 if (!ident)
5ecd293d 663 return 0;
3fed15f5 664
5ecd293d 665 cnt = count_ident(src, len);
3fed15f5 666 if (!cnt)
5ecd293d 667 return 0;
3fed15f5 668
5ecd293d
PH
669 /* are we "faking" in place editing ? */
670 if (src == buf->buf)
b315c5c0 671 to_free = strbuf_detach(buf, NULL);
5ecd293d 672 hash_sha1_file(src, len, "blob", sha1);
3fed15f5 673
5ecd293d
PH
674 strbuf_grow(buf, len + cnt * 43);
675 for (;;) {
676 /* step 1: run to the next '$' */
677 dollar = memchr(src, '$', len);
678 if (!dollar)
679 break;
680 strbuf_add(buf, src, dollar + 1 - src);
681 len -= dollar + 1 - src;
682 src = dollar + 1;
c23290d5 683
5ecd293d
PH
684 /* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */
685 if (len < 3 || memcmp("Id", src, 2))
3fed15f5
JH
686 continue;
687
5ecd293d
PH
688 /* step 3: skip over Id$ or Id:xxxxx$ */
689 if (src[2] == '$') {
690 src += 3;
691 len -= 3;
692 } else if (src[2] == ':') {
693 /*
694 * It's possible that an expanded Id has crept its way into the
07814d90
HG
695 * repository, we cope with that by stripping the expansion out.
696 * This is probably not a good idea, since it will cause changes
697 * on checkout, which won't go away by stash, but let's keep it
698 * for git-style ids.
5ecd293d
PH
699 */
700 dollar = memchr(src + 3, '$', len - 3);
701 if (!dollar) {
702 /* incomplete keyword, no more '$', so just quit the loop */
703 break;
704 }
c23290d5 705
a9f3049f
HG
706 if (memchr(src + 3, '\n', dollar - src - 3)) {
707 /* Line break before the next dollar. */
708 continue;
709 }
710
07814d90
HG
711 spc = memchr(src + 4, ' ', dollar - src - 4);
712 if (spc && spc < dollar-1) {
713 /* There are spaces in unexpected places.
714 * This is probably an id from some other
715 * versioning system. Keep it for now.
716 */
717 continue;
718 }
719
5ecd293d
PH
720 len -= dollar + 1 - src;
721 src = dollar + 1;
722 } else {
723 /* it wasn't a "Id$" or "Id:xxxx$" */
724 continue;
725 }
c23290d5 726
5ecd293d
PH
727 /* step 4: substitute */
728 strbuf_addstr(buf, "Id: ");
729 strbuf_add(buf, sha1_to_hex(sha1), 40);
730 strbuf_addstr(buf, " $");
3fed15f5 731 }
5ecd293d 732 strbuf_add(buf, src, len);
3fed15f5 733
5ecd293d
PH
734 free(to_free);
735 return 1;
35ebfd6a
JH
736}
737
92cce135 738static enum crlf_action git_path_check_crlf(struct git_attr_check *check)
35ebfd6a 739{
6073ee85
JH
740 const char *value = check->value;
741
742 if (ATTR_TRUE(value))
743 return CRLF_TEXT;
744 else if (ATTR_FALSE(value))
745 return CRLF_BINARY;
746 else if (ATTR_UNSET(value))
747 ;
748 else if (!strcmp(value, "input"))
df747b81 749 return CRLF_TEXT_INPUT;
fd6cce9e
EB
750 else if (!strcmp(value, "auto"))
751 return CRLF_AUTO;
df747b81 752 return CRLF_UNDEFINED;
35ebfd6a
JH
753}
754
92cce135 755static enum eol git_path_check_eol(struct git_attr_check *check)
fd6cce9e
EB
756{
757 const char *value = check->value;
758
759 if (ATTR_UNSET(value))
760 ;
761 else if (!strcmp(value, "lf"))
762 return EOL_LF;
763 else if (!strcmp(value, "crlf"))
764 return EOL_CRLF;
765 return EOL_UNSET;
766}
767
92cce135 768static struct convert_driver *git_path_check_convert(struct git_attr_check *check)
aa4ed402
JH
769{
770 const char *value = check->value;
771 struct convert_driver *drv;
772
773 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
774 return NULL;
775 for (drv = user_convert; drv; drv = drv->next)
776 if (!strcmp(value, drv->name))
777 return drv;
778 return NULL;
779}
780
92cce135 781static int git_path_check_ident(struct git_attr_check *check)
3fed15f5
JH
782{
783 const char *value = check->value;
784
785 return !!ATTR_TRUE(value);
786}
787
3bfba20d
JH
788struct conv_attrs {
789 struct convert_driver *drv;
bb211b4d
TB
790 enum crlf_action attr_action; /* What attr says */
791 enum crlf_action crlf_action; /* When no attr is set, use core.autocrlf */
3bfba20d
JH
792 int ident;
793};
794
83295964
JH
795static const char *conv_attr_name[] = {
796 "crlf", "ident", "filter", "eol", "text",
797};
798#define NUM_CONV_ATTRS ARRAY_SIZE(conv_attr_name)
799
3bfba20d 800static void convert_attrs(struct conv_attrs *ca, const char *path)
83295964
JH
801{
802 int i;
803 static struct git_attr_check ccheck[NUM_CONV_ATTRS];
804
805 if (!ccheck[0].attr) {
806 for (i = 0; i < NUM_CONV_ATTRS; i++)
807 ccheck[i].attr = git_attr(conv_attr_name[i]);
808 user_convert_tail = &user_convert;
809 git_config(read_convert_config, NULL);
810 }
3bfba20d 811
d932f4eb 812 if (!git_check_attr(path, NUM_CONV_ATTRS, ccheck)) {
bb211b4d 813 ca->crlf_action = git_path_check_crlf(ccheck + 4);
df747b81 814 if (ca->crlf_action == CRLF_UNDEFINED)
92cce135 815 ca->crlf_action = git_path_check_crlf(ccheck + 0);
bb211b4d 816 ca->attr_action = ca->crlf_action;
92cce135
TB
817 ca->ident = git_path_check_ident(ccheck + 1);
818 ca->drv = git_path_check_convert(ccheck + 2);
817a0c79
TB
819 if (ca->crlf_action != CRLF_BINARY) {
820 enum eol eol_attr = git_path_check_eol(ccheck + 3);
65237284
TB
821 if (ca->crlf_action == CRLF_AUTO && eol_attr == EOL_LF)
822 ca->crlf_action = CRLF_AUTO_INPUT;
823 else if (ca->crlf_action == CRLF_AUTO && eol_attr == EOL_CRLF)
824 ca->crlf_action = CRLF_AUTO_CRLF;
825 else if (eol_attr == EOL_LF)
817a0c79
TB
826 ca->crlf_action = CRLF_TEXT_INPUT;
827 else if (eol_attr == EOL_CRLF)
828 ca->crlf_action = CRLF_TEXT_CRLF;
829 }
830 ca->attr_action = ca->crlf_action;
3bfba20d
JH
831 } else {
832 ca->drv = NULL;
df747b81 833 ca->crlf_action = CRLF_UNDEFINED;
3bfba20d
JH
834 ca->ident = 0;
835 }
df747b81
TB
836 if (ca->crlf_action == CRLF_TEXT)
837 ca->crlf_action = text_eol_is_crlf() ? CRLF_TEXT_CRLF : CRLF_TEXT_INPUT;
838 if (ca->crlf_action == CRLF_UNDEFINED && auto_crlf == AUTO_CRLF_FALSE)
839 ca->crlf_action = CRLF_BINARY;
840 if (ca->crlf_action == CRLF_UNDEFINED && auto_crlf == AUTO_CRLF_TRUE)
841 ca->crlf_action = CRLF_AUTO_CRLF;
842 if (ca->crlf_action == CRLF_UNDEFINED && auto_crlf == AUTO_CRLF_INPUT)
843 ca->crlf_action = CRLF_AUTO_INPUT;
83295964
JH
844}
845
9035d75a
SP
846int would_convert_to_git_filter_fd(const char *path)
847{
848 struct conv_attrs ca;
849
850 convert_attrs(&ca, path);
851 if (!ca.drv)
852 return 0;
853
854 /*
855 * Apply a filter to an fd only if the filter is required to succeed.
856 * We must die if the filter fails, because the original data before
857 * filtering is not available.
858 */
859 if (!ca.drv->required)
860 return 0;
861
234fa07e 862 return apply_filter(path, NULL, 0, -1, NULL, ca.drv, CAP_CLEAN);
9035d75a
SP
863}
864
a7630bd4
TB
865const char *get_convert_attr_ascii(const char *path)
866{
867 struct conv_attrs ca;
a7630bd4
TB
868
869 convert_attrs(&ca, path);
bb211b4d 870 switch (ca.attr_action) {
df747b81 871 case CRLF_UNDEFINED:
a7630bd4
TB
872 return "";
873 case CRLF_BINARY:
874 return "-text";
875 case CRLF_TEXT:
876 return "text";
df747b81 877 case CRLF_TEXT_INPUT:
a7630bd4 878 return "text eol=lf";
df747b81
TB
879 case CRLF_TEXT_CRLF:
880 return "text eol=crlf";
a7630bd4
TB
881 case CRLF_AUTO:
882 return "text=auto";
df747b81 883 case CRLF_AUTO_CRLF:
65237284 884 return "text=auto eol=crlf";
df747b81 885 case CRLF_AUTO_INPUT:
65237284 886 return "text=auto eol=lf";
a7630bd4
TB
887 }
888 return "";
889}
890
21e5ad50
SP
891int convert_to_git(const char *path, const char *src, size_t len,
892 struct strbuf *dst, enum safe_crlf checksafe)
35ebfd6a 893{
3bfba20d 894 int ret = 0;
3bfba20d 895 struct conv_attrs ca;
6073ee85 896
3bfba20d 897 convert_attrs(&ca, path);
3fed15f5 898
234fa07e
LS
899 ret |= apply_filter(path, src, len, -1, dst, ca.drv, CAP_CLEAN);
900 if (!ret && ca.drv && ca.drv->required)
36daaaca
JB
901 die("%s: clean filter '%s' failed", path, ca.drv->name);
902
92ac3197 903 if (ret && dst) {
5ecd293d
PH
904 src = dst->buf;
905 len = dst->len;
aa4ed402 906 }
3bfba20d 907 ret |= crlf_to_git(path, src, len, dst, ca.crlf_action, checksafe);
92ac3197 908 if (ret && dst) {
5ecd293d
PH
909 src = dst->buf;
910 len = dst->len;
6073ee85 911 }
3bfba20d 912 return ret | ident_to_git(path, src, len, dst, ca.ident);
35ebfd6a
JH
913}
914
9035d75a
SP
915void convert_to_git_filter_fd(const char *path, int fd, struct strbuf *dst,
916 enum safe_crlf checksafe)
917{
918 struct conv_attrs ca;
919 convert_attrs(&ca, path);
920
921 assert(ca.drv);
922 assert(ca.drv->clean);
923
234fa07e 924 if (!apply_filter(path, NULL, 0, fd, dst, ca.drv, CAP_CLEAN))
9035d75a
SP
925 die("%s: clean filter '%s' failed", path, ca.drv->name);
926
9035d75a
SP
927 crlf_to_git(path, dst->buf, dst->len, dst, ca.crlf_action, checksafe);
928 ident_to_git(path, dst->buf, dst->len, dst, ca.ident);
929}
930
43dd2332
EB
931static int convert_to_working_tree_internal(const char *path, const char *src,
932 size_t len, struct strbuf *dst,
933 int normalizing)
35ebfd6a 934{
36daaaca 935 int ret = 0, ret_filter = 0;
3bfba20d 936 struct conv_attrs ca;
6073ee85 937
3bfba20d 938 convert_attrs(&ca, path);
3fed15f5 939
3bfba20d 940 ret |= ident_to_worktree(path, src, len, dst, ca.ident);
5ecd293d
PH
941 if (ret) {
942 src = dst->buf;
943 len = dst->len;
3fed15f5 944 }
43dd2332
EB
945 /*
946 * CRLF conversion can be skipped if normalizing, unless there
947 * is a smudge filter. The filter might expect CRLFs.
948 */
234fa07e 949 if ((ca.drv && ca.drv->smudge) || !normalizing) {
3bfba20d 950 ret |= crlf_to_worktree(path, src, len, dst, ca.crlf_action);
43dd2332
EB
951 if (ret) {
952 src = dst->buf;
953 len = dst->len;
954 }
aa4ed402 955 }
36daaaca 956
234fa07e
LS
957 ret_filter = apply_filter(path, src, len, -1, dst, ca.drv, CAP_SMUDGE);
958 if (!ret_filter && ca.drv && ca.drv->required)
36daaaca
JB
959 die("%s: smudge filter %s failed", path, ca.drv->name);
960
961 return ret | ret_filter;
35ebfd6a 962}
f217f0e8 963
43dd2332
EB
964int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst)
965{
966 return convert_to_working_tree_internal(path, src, len, dst, 0);
967}
968
f217f0e8
EB
969int renormalize_buffer(const char *path, const char *src, size_t len, struct strbuf *dst)
970{
43dd2332 971 int ret = convert_to_working_tree_internal(path, src, len, dst, 1);
f217f0e8
EB
972 if (ret) {
973 src = dst->buf;
974 len = dst->len;
975 }
65237284 976 return ret | convert_to_git(path, src, len, dst, SAFE_CRLF_RENORMALIZE);
f217f0e8 977}
dd8e9121 978
b6691092
JH
979/*****************************************************************
980 *
749f763d 981 * Streaming conversion support
b6691092
JH
982 *
983 *****************************************************************/
984
985typedef int (*filter_fn)(struct stream_filter *,
986 const char *input, size_t *isize_p,
987 char *output, size_t *osize_p);
988typedef void (*free_fn)(struct stream_filter *);
989
990struct stream_filter_vtbl {
991 filter_fn filter;
992 free_fn free;
993};
994
995struct stream_filter {
996 struct stream_filter_vtbl *vtbl;
997};
998
999static int null_filter_fn(struct stream_filter *filter,
1000 const char *input, size_t *isize_p,
1001 char *output, size_t *osize_p)
1002{
4ae66704
JH
1003 size_t count;
1004
1005 if (!input)
1006 return 0; /* we do not keep any states */
1007 count = *isize_p;
b6691092
JH
1008 if (*osize_p < count)
1009 count = *osize_p;
1010 if (count) {
1011 memmove(output, input, count);
1012 *isize_p -= count;
1013 *osize_p -= count;
1014 }
1015 return 0;
1016}
1017
1018static void null_free_fn(struct stream_filter *filter)
1019{
1020 ; /* nothing -- null instances are shared */
1021}
1022
1023static struct stream_filter_vtbl null_vtbl = {
1024 null_filter_fn,
1025 null_free_fn,
1026};
1027
1028static struct stream_filter null_filter_singleton = {
1029 &null_vtbl,
1030};
1031
1032int is_null_stream_filter(struct stream_filter *filter)
1033{
1034 return filter == &null_filter_singleton;
1035}
1036
b84c7839
JH
1037
1038/*
1039 * LF-to-CRLF filter
1040 */
284e3d28
CMN
1041
1042struct lf_to_crlf_filter {
1043 struct stream_filter filter;
8496f568
JH
1044 unsigned has_held:1;
1045 char held;
284e3d28
CMN
1046};
1047
e322ee38
JH
1048static int lf_to_crlf_filter_fn(struct stream_filter *filter,
1049 const char *input, size_t *isize_p,
1050 char *output, size_t *osize_p)
1051{
284e3d28
CMN
1052 size_t count, o = 0;
1053 struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter;
1054
8496f568
JH
1055 /*
1056 * We may be holding onto the CR to see if it is followed by a
1057 * LF, in which case we would need to go to the main loop.
1058 * Otherwise, just emit it to the output stream.
1059 */
1060 if (lf_to_crlf->has_held && (lf_to_crlf->held != '\r' || !input)) {
1061 output[o++] = lf_to_crlf->held;
1062 lf_to_crlf->has_held = 0;
284e3d28 1063 }
e322ee38 1064
87afe9a5
JH
1065 /* We are told to drain */
1066 if (!input) {
1067 *osize_p -= o;
1068 return 0;
1069 }
e322ee38 1070
e322ee38 1071 count = *isize_p;
8496f568 1072 if (count || lf_to_crlf->has_held) {
284e3d28 1073 size_t i;
8496f568
JH
1074 int was_cr = 0;
1075
1076 if (lf_to_crlf->has_held) {
1077 was_cr = 1;
1078 lf_to_crlf->has_held = 0;
1079 }
1080
284e3d28 1081 for (i = 0; o < *osize_p && i < count; i++) {
e322ee38 1082 char ch = input[i];
8496f568 1083
e322ee38 1084 if (ch == '\n') {
284e3d28 1085 output[o++] = '\r';
8496f568
JH
1086 } else if (was_cr) {
1087 /*
1088 * Previous round saw CR and it is not followed
1089 * by a LF; emit the CR before processing the
1090 * current character.
1091 */
1092 output[o++] = '\r';
e322ee38 1093 }
8496f568
JH
1094
1095 /*
1096 * We may have consumed the last output slot,
1097 * in which case we need to break out of this
1098 * loop; hold the current character before
1099 * returning.
1100 */
1101 if (*osize_p <= o) {
1102 lf_to_crlf->has_held = 1;
1103 lf_to_crlf->held = ch;
1104 continue; /* break but increment i */
1105 }
1106
1107 if (ch == '\r') {
1108 was_cr = 1;
1109 continue;
1110 }
1111
1112 was_cr = 0;
e322ee38
JH
1113 output[o++] = ch;
1114 }
1115
1116 *osize_p -= o;
1117 *isize_p -= i;
8496f568
JH
1118
1119 if (!lf_to_crlf->has_held && was_cr) {
1120 lf_to_crlf->has_held = 1;
1121 lf_to_crlf->held = '\r';
1122 }
e322ee38
JH
1123 }
1124 return 0;
1125}
1126
284e3d28
CMN
1127static void lf_to_crlf_free_fn(struct stream_filter *filter)
1128{
1129 free(filter);
1130}
1131
e322ee38
JH
1132static struct stream_filter_vtbl lf_to_crlf_vtbl = {
1133 lf_to_crlf_filter_fn,
284e3d28 1134 lf_to_crlf_free_fn,
e322ee38
JH
1135};
1136
284e3d28
CMN
1137static struct stream_filter *lf_to_crlf_filter(void)
1138{
87afe9a5 1139 struct lf_to_crlf_filter *lf_to_crlf = xcalloc(1, sizeof(*lf_to_crlf));
e322ee38 1140
284e3d28 1141 lf_to_crlf->filter.vtbl = &lf_to_crlf_vtbl;
284e3d28
CMN
1142 return (struct stream_filter *)lf_to_crlf;
1143}
b84c7839 1144
a265a7f9
JH
1145/*
1146 * Cascade filter
1147 */
1148#define FILTER_BUFFER 1024
1149struct cascade_filter {
1150 struct stream_filter filter;
1151 struct stream_filter *one;
1152 struct stream_filter *two;
1153 char buf[FILTER_BUFFER];
1154 int end, ptr;
1155};
1156
1157static int cascade_filter_fn(struct stream_filter *filter,
1158 const char *input, size_t *isize_p,
1159 char *output, size_t *osize_p)
1160{
1161 struct cascade_filter *cas = (struct cascade_filter *) filter;
1162 size_t filled = 0;
1163 size_t sz = *osize_p;
1164 size_t to_feed, remaining;
1165
1166 /*
1167 * input -- (one) --> buf -- (two) --> output
1168 */
1169 while (filled < sz) {
1170 remaining = sz - filled;
1171
1172 /* do we already have something to feed two with? */
1173 if (cas->ptr < cas->end) {
1174 to_feed = cas->end - cas->ptr;
1175 if (stream_filter(cas->two,
1176 cas->buf + cas->ptr, &to_feed,
1177 output + filled, &remaining))
1178 return -1;
1179 cas->ptr += (cas->end - cas->ptr) - to_feed;
1180 filled = sz - remaining;
1181 continue;
1182 }
1183
1184 /* feed one from upstream and have it emit into our buffer */
1185 to_feed = input ? *isize_p : 0;
1186 if (input && !to_feed)
1187 break;
1188 remaining = sizeof(cas->buf);
1189 if (stream_filter(cas->one,
1190 input, &to_feed,
1191 cas->buf, &remaining))
1192 return -1;
1193 cas->end = sizeof(cas->buf) - remaining;
1194 cas->ptr = 0;
1195 if (input) {
1196 size_t fed = *isize_p - to_feed;
1197 *isize_p -= fed;
1198 input += fed;
1199 }
1200
1201 /* do we know that we drained one completely? */
1202 if (input || cas->end)
1203 continue;
1204
1205 /* tell two to drain; we have nothing more to give it */
1206 to_feed = 0;
1207 remaining = sz - filled;
1208 if (stream_filter(cas->two,
1209 NULL, &to_feed,
1210 output + filled, &remaining))
1211 return -1;
1212 if (remaining == (sz - filled))
1213 break; /* completely drained two */
1214 filled = sz - remaining;
1215 }
1216 *osize_p -= filled;
1217 return 0;
1218}
1219
1220static void cascade_free_fn(struct stream_filter *filter)
1221{
1222 struct cascade_filter *cas = (struct cascade_filter *)filter;
1223 free_stream_filter(cas->one);
1224 free_stream_filter(cas->two);
1225 free(filter);
1226}
1227
1228static struct stream_filter_vtbl cascade_vtbl = {
1229 cascade_filter_fn,
1230 cascade_free_fn,
1231};
1232
1233static struct stream_filter *cascade_filter(struct stream_filter *one,
1234 struct stream_filter *two)
1235{
1236 struct cascade_filter *cascade;
1237
1238 if (!one || is_null_stream_filter(one))
1239 return two;
1240 if (!two || is_null_stream_filter(two))
1241 return one;
1242
1243 cascade = xmalloc(sizeof(*cascade));
1244 cascade->one = one;
1245 cascade->two = two;
1246 cascade->end = cascade->ptr = 0;
1247 cascade->filter.vtbl = &cascade_vtbl;
1248 return (struct stream_filter *)cascade;
1249}
1250
b84c7839
JH
1251/*
1252 * ident filter
1253 */
1254#define IDENT_DRAINING (-1)
1255#define IDENT_SKIPPING (-2)
1256struct ident_filter {
1257 struct stream_filter filter;
1258 struct strbuf left;
1259 int state;
1260 char ident[45]; /* ": x40 $" */
1261};
1262
1263static int is_foreign_ident(const char *str)
1264{
1265 int i;
1266
ae021d87 1267 if (!skip_prefix(str, "$Id: ", &str))
b84c7839 1268 return 0;
ae021d87 1269 for (i = 0; str[i]; i++) {
b84c7839
JH
1270 if (isspace(str[i]) && str[i+1] != '$')
1271 return 1;
1272 }
1273 return 0;
1274}
1275
1276static void ident_drain(struct ident_filter *ident, char **output_p, size_t *osize_p)
1277{
1278 size_t to_drain = ident->left.len;
1279
1280 if (*osize_p < to_drain)
1281 to_drain = *osize_p;
1282 if (to_drain) {
1283 memcpy(*output_p, ident->left.buf, to_drain);
1284 strbuf_remove(&ident->left, 0, to_drain);
1285 *output_p += to_drain;
1286 *osize_p -= to_drain;
1287 }
1288 if (!ident->left.len)
1289 ident->state = 0;
1290}
1291
1292static int ident_filter_fn(struct stream_filter *filter,
1293 const char *input, size_t *isize_p,
1294 char *output, size_t *osize_p)
1295{
1296 struct ident_filter *ident = (struct ident_filter *)filter;
1297 static const char head[] = "$Id";
1298
1299 if (!input) {
1300 /* drain upon eof */
1301 switch (ident->state) {
1302 default:
1303 strbuf_add(&ident->left, head, ident->state);
1304 case IDENT_SKIPPING:
1305 /* fallthru */
1306 case IDENT_DRAINING:
1307 ident_drain(ident, &output, osize_p);
1308 }
1309 return 0;
1310 }
1311
1312 while (*isize_p || (ident->state == IDENT_DRAINING)) {
1313 int ch;
1314
1315 if (ident->state == IDENT_DRAINING) {
1316 ident_drain(ident, &output, osize_p);
1317 if (!*osize_p)
1318 break;
1319 continue;
1320 }
1321
1322 ch = *(input++);
1323 (*isize_p)--;
1324
1325 if (ident->state == IDENT_SKIPPING) {
1326 /*
1327 * Skipping until '$' or LF, but keeping them
1328 * in case it is a foreign ident.
1329 */
1330 strbuf_addch(&ident->left, ch);
1331 if (ch != '\n' && ch != '$')
1332 continue;
1333 if (ch == '$' && !is_foreign_ident(ident->left.buf)) {
1334 strbuf_setlen(&ident->left, sizeof(head) - 1);
1335 strbuf_addstr(&ident->left, ident->ident);
1336 }
1337 ident->state = IDENT_DRAINING;
1338 continue;
1339 }
1340
1341 if (ident->state < sizeof(head) &&
1342 head[ident->state] == ch) {
1343 ident->state++;
1344 continue;
1345 }
1346
1347 if (ident->state)
1348 strbuf_add(&ident->left, head, ident->state);
1349 if (ident->state == sizeof(head) - 1) {
1350 if (ch != ':' && ch != '$') {
1351 strbuf_addch(&ident->left, ch);
1352 ident->state = 0;
1353 continue;
1354 }
1355
1356 if (ch == ':') {
1357 strbuf_addch(&ident->left, ch);
1358 ident->state = IDENT_SKIPPING;
1359 } else {
1360 strbuf_addstr(&ident->left, ident->ident);
1361 ident->state = IDENT_DRAINING;
1362 }
1363 continue;
1364 }
1365
1366 strbuf_addch(&ident->left, ch);
1367 ident->state = IDENT_DRAINING;
1368 }
1369 return 0;
1370}
1371
1372static void ident_free_fn(struct stream_filter *filter)
1373{
1374 struct ident_filter *ident = (struct ident_filter *)filter;
1375 strbuf_release(&ident->left);
1376 free(filter);
1377}
1378
1379static struct stream_filter_vtbl ident_vtbl = {
1380 ident_filter_fn,
1381 ident_free_fn,
1382};
1383
1384static struct stream_filter *ident_filter(const unsigned char *sha1)
1385{
1386 struct ident_filter *ident = xmalloc(sizeof(*ident));
1387
5096d490
JK
1388 xsnprintf(ident->ident, sizeof(ident->ident),
1389 ": %s $", sha1_to_hex(sha1));
b84c7839
JH
1390 strbuf_init(&ident->left, 0);
1391 ident->filter.vtbl = &ident_vtbl;
1392 ident->state = 0;
1393 return (struct stream_filter *)ident;
1394}
1395
dd8e9121 1396/*
b6691092
JH
1397 * Return an appropriately constructed filter for the path, or NULL if
1398 * the contents cannot be filtered without reading the whole thing
1399 * in-core.
1400 *
1401 * Note that you would be crazy to set CRLF, smuge/clean or ident to a
1402 * large binary blob you would want us not to slurp into the memory!
dd8e9121 1403 */
b6691092 1404struct stream_filter *get_stream_filter(const char *path, const unsigned char *sha1)
dd8e9121
JH
1405{
1406 struct conv_attrs ca;
b84c7839 1407 struct stream_filter *filter = NULL;
dd8e9121
JH
1408
1409 convert_attrs(&ca, path);
b84c7839 1410 if (ca.drv && (ca.drv->smudge || ca.drv->clean))
caa47adc
TB
1411 return NULL;
1412
1413 if (ca.crlf_action == CRLF_AUTO || ca.crlf_action == CRLF_AUTO_CRLF)
1414 return NULL;
b84c7839
JH
1415
1416 if (ca.ident)
1417 filter = ident_filter(sha1);
dd8e9121 1418
caa47adc 1419 if (output_eol(ca.crlf_action) == EOL_CRLF)
284e3d28 1420 filter = cascade_filter(filter, lf_to_crlf_filter());
caa47adc
TB
1421 else
1422 filter = cascade_filter(filter, &null_filter_singleton);
e322ee38 1423
b84c7839 1424 return filter;
b6691092
JH
1425}
1426
1427void free_stream_filter(struct stream_filter *filter)
1428{
1429 filter->vtbl->free(filter);
1430}
1431
1432int stream_filter(struct stream_filter *filter,
1433 const char *input, size_t *isize_p,
1434 char *output, size_t *osize_p)
1435{
1436 return filter->vtbl->filter(filter, input, isize_p, output, osize_p);
dd8e9121 1437}