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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 | ||
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 | 21 | enum crlf_action { |
fd6cce9e EB |
22 | CRLF_GUESS = -1, |
23 | CRLF_BINARY = 0, | |
24 | CRLF_TEXT, | |
25 | CRLF_INPUT, | |
26 | CRLF_CRLF, | |
c9b6782a | 27 | CRLF_AUTO |
fd6cce9e | 28 | }; |
163b9591 | 29 | |
6c510bee | 30 | struct text_stat { |
28624193 DP |
31 | /* NUL, CR, LF and CRLF counts */ |
32 | unsigned nul, cr, lf, crlf; | |
6c510bee LT |
33 | |
34 | /* These are just approximations! */ | |
35 | unsigned printable, nonprintable; | |
36 | }; | |
37 | ||
38 | static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats) | |
39 | { | |
40 | unsigned long i; | |
41 | ||
42 | memset(stats, 0, sizeof(*stats)); | |
43 | ||
44 | for (i = 0; i < size; i++) { | |
45 | unsigned char c = buf[i]; | |
46 | if (c == '\r') { | |
47 | stats->cr++; | |
48 | if (i+1 < size && buf[i+1] == '\n') | |
49 | stats->crlf++; | |
50 | continue; | |
51 | } | |
52 | if (c == '\n') { | |
53 | stats->lf++; | |
54 | continue; | |
55 | } | |
56 | if (c == 127) | |
57 | /* DEL */ | |
58 | stats->nonprintable++; | |
59 | else if (c < 32) { | |
60 | switch (c) { | |
61 | /* BS, HT, ESC and FF */ | |
62 | case '\b': case '\t': case '\033': case '\014': | |
63 | stats->printable++; | |
64 | break; | |
28624193 DP |
65 | case 0: |
66 | stats->nul++; | |
67 | /* fall through */ | |
6c510bee LT |
68 | default: |
69 | stats->nonprintable++; | |
70 | } | |
71 | } | |
72 | else | |
73 | stats->printable++; | |
74 | } | |
f9dd4bf4 DK |
75 | |
76 | /* If file ends with EOF then don't count this EOF as non-printable. */ | |
77 | if (size >= 1 && buf[size-1] == '\032') | |
78 | stats->nonprintable--; | |
6c510bee LT |
79 | } |
80 | ||
81 | /* | |
82 | * The same heuristics as diff.c::mmfile_is_binary() | |
a7630bd4 | 83 | * We treat files with bare CR as binary |
6c510bee | 84 | */ |
a7630bd4 | 85 | static int convert_is_binary(unsigned long size, const struct text_stat *stats) |
6c510bee | 86 | { |
a7630bd4 TB |
87 | if (stats->cr != stats->crlf) |
88 | return 1; | |
28624193 DP |
89 | if (stats->nul) |
90 | return 1; | |
6c510bee LT |
91 | if ((stats->printable >> 7) < stats->nonprintable) |
92 | return 1; | |
6c510bee LT |
93 | return 0; |
94 | } | |
95 | ||
a7630bd4 TB |
96 | static unsigned int gather_convert_stats(const char *data, unsigned long size) |
97 | { | |
98 | struct text_stat stats; | |
99 | if (!data || !size) | |
100 | return 0; | |
101 | gather_stats(data, size, &stats); | |
102 | if (convert_is_binary(size, &stats)) | |
103 | return CONVERT_STAT_BITS_BIN; | |
104 | else if (stats.crlf && stats.crlf == stats.lf) | |
105 | return CONVERT_STAT_BITS_TXT_CRLF; | |
106 | else if (stats.crlf && stats.lf) | |
107 | return CONVERT_STAT_BITS_TXT_CRLF | CONVERT_STAT_BITS_TXT_LF; | |
108 | else if (stats.lf) | |
109 | return CONVERT_STAT_BITS_TXT_LF; | |
110 | else | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static const char *gather_convert_stats_ascii(const char *data, unsigned long size) | |
115 | { | |
116 | unsigned int convert_stats = gather_convert_stats(data, size); | |
117 | ||
118 | if (convert_stats & CONVERT_STAT_BITS_BIN) | |
119 | return "-text"; | |
120 | switch (convert_stats) { | |
121 | case CONVERT_STAT_BITS_TXT_LF: | |
122 | return "lf"; | |
123 | case CONVERT_STAT_BITS_TXT_CRLF: | |
124 | return "crlf"; | |
125 | case CONVERT_STAT_BITS_TXT_LF | CONVERT_STAT_BITS_TXT_CRLF: | |
126 | return "mixed"; | |
127 | default: | |
128 | return "none"; | |
129 | } | |
130 | } | |
131 | ||
132 | const char *get_cached_convert_stats_ascii(const char *path) | |
133 | { | |
134 | const char *ret; | |
135 | unsigned long sz; | |
136 | void *data = read_blob_data_from_cache(path, &sz); | |
137 | ret = gather_convert_stats_ascii(data, sz); | |
138 | free(data); | |
139 | return ret; | |
140 | } | |
141 | ||
142 | const char *get_wt_convert_stats_ascii(const char *path) | |
143 | { | |
144 | const char *ret = ""; | |
145 | struct strbuf sb = STRBUF_INIT; | |
146 | if (strbuf_read_file(&sb, path, 0) >= 0) | |
147 | ret = gather_convert_stats_ascii(sb.buf, sb.len); | |
148 | strbuf_release(&sb); | |
149 | return ret; | |
150 | } | |
151 | ||
4b4024f5 TB |
152 | static int text_eol_is_crlf(void) |
153 | { | |
154 | if (auto_crlf == AUTO_CRLF_TRUE) | |
155 | return 1; | |
156 | else if (auto_crlf == AUTO_CRLF_INPUT) | |
157 | return 0; | |
158 | if (core_eol == EOL_CRLF) | |
159 | return 1; | |
160 | if (core_eol == EOL_UNSET && EOL_NATIVE == EOL_CRLF) | |
161 | return 1; | |
162 | return 0; | |
163 | } | |
164 | ||
c61dcff9 | 165 | static enum eol output_eol(enum crlf_action crlf_action) |
f217f0e8 | 166 | { |
c61dcff9 | 167 | switch (crlf_action) { |
942e7747 EB |
168 | case CRLF_BINARY: |
169 | return EOL_UNSET; | |
170 | case CRLF_CRLF: | |
171 | return EOL_CRLF; | |
172 | case CRLF_INPUT: | |
173 | return EOL_LF; | |
174 | case CRLF_GUESS: | |
175 | if (!auto_crlf) | |
176 | return EOL_UNSET; | |
177 | /* fall through */ | |
178 | case CRLF_TEXT: | |
179 | case CRLF_AUTO: | |
4b4024f5 | 180 | return text_eol_is_crlf() ? EOL_CRLF : EOL_LF; |
942e7747 | 181 | } |
ec70f52f | 182 | return core_eol; |
942e7747 EB |
183 | } |
184 | ||
c61dcff9 | 185 | static void check_safe_crlf(const char *path, enum crlf_action crlf_action, |
21e5ad50 SP |
186 | struct text_stat *stats, enum safe_crlf checksafe) |
187 | { | |
188 | if (!checksafe) | |
189 | return; | |
190 | ||
c61dcff9 | 191 | if (output_eol(crlf_action) == EOL_LF) { |
21e5ad50 SP |
192 | /* |
193 | * CRLFs would not be restored by checkout: | |
194 | * check if we'd remove CRLFs | |
195 | */ | |
196 | if (stats->crlf) { | |
197 | if (checksafe == SAFE_CRLF_WARN) | |
942e7747 | 198 | warning("CRLF will be replaced by LF in %s.\nThe file will have its original line endings in your working directory.", path); |
21e5ad50 SP |
199 | else /* i.e. SAFE_CRLF_FAIL */ |
200 | die("CRLF would be replaced by LF in %s.", path); | |
201 | } | |
c61dcff9 | 202 | } else if (output_eol(crlf_action) == EOL_CRLF) { |
21e5ad50 SP |
203 | /* |
204 | * CRLFs would be added by checkout: | |
205 | * check if we have "naked" LFs | |
206 | */ | |
207 | if (stats->lf != stats->crlf) { | |
208 | if (checksafe == SAFE_CRLF_WARN) | |
942e7747 | 209 | warning("LF will be replaced by CRLF in %s.\nThe file will have its original line endings in your working directory.", path); |
21e5ad50 SP |
210 | else /* i.e. SAFE_CRLF_FAIL */ |
211 | die("LF would be replaced by CRLF in %s", path); | |
212 | } | |
213 | } | |
214 | } | |
215 | ||
c4805393 FAG |
216 | static int has_cr_in_index(const char *path) |
217 | { | |
c4805393 | 218 | unsigned long sz; |
c4805393 FAG |
219 | void *data; |
220 | int has_cr; | |
c4805393 | 221 | |
4982fd78 LF |
222 | data = read_blob_data_from_cache(path, &sz); |
223 | if (!data) | |
c4805393 | 224 | return 0; |
c4805393 FAG |
225 | has_cr = memchr(data, '\r', sz) != NULL; |
226 | free(data); | |
227 | return has_cr; | |
228 | } | |
229 | ||
5ecd293d | 230 | static int crlf_to_git(const char *path, const char *src, size_t len, |
c61dcff9 JH |
231 | struct strbuf *buf, |
232 | enum crlf_action crlf_action, enum safe_crlf checksafe) | |
6c510bee | 233 | { |
6c510bee | 234 | struct text_stat stats; |
5ecd293d | 235 | char *dst; |
6c510bee | 236 | |
c61dcff9 | 237 | if (crlf_action == CRLF_BINARY || |
4c3b57b9 JK |
238 | (crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE) || |
239 | (src && !len)) | |
5ecd293d | 240 | return 0; |
6c510bee | 241 | |
4c3b57b9 JK |
242 | /* |
243 | * If we are doing a dry-run and have no source buffer, there is | |
244 | * nothing to analyze; we must assume we would convert. | |
245 | */ | |
246 | if (!buf && !src) | |
247 | return 1; | |
248 | ||
5ecd293d | 249 | gather_stats(src, len, &stats); |
6c510bee | 250 | |
c61dcff9 | 251 | if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) { |
a7630bd4 | 252 | if (convert_is_binary(len, &stats)) |
5ecd293d | 253 | return 0; |
c4805393 | 254 | |
c61dcff9 | 255 | if (crlf_action == CRLF_GUESS) { |
fd6cce9e EB |
256 | /* |
257 | * If the file in the index has any CR in it, do not convert. | |
258 | * This is the new safer autocrlf handling. | |
259 | */ | |
260 | if (has_cr_in_index(path)) | |
261 | return 0; | |
262 | } | |
201ac8ef | 263 | } |
6c510bee | 264 | |
c61dcff9 | 265 | check_safe_crlf(path, crlf_action, &stats, checksafe); |
21e5ad50 SP |
266 | |
267 | /* Optimization: No CR? Nothing to convert, regardless. */ | |
268 | if (!stats.cr) | |
269 | return 0; | |
270 | ||
92ac3197 JK |
271 | /* |
272 | * At this point all of our source analysis is done, and we are sure we | |
273 | * would convert. If we are in dry-run mode, we can give an answer. | |
274 | */ | |
275 | if (!buf) | |
276 | return 1; | |
277 | ||
90d16ec0 PH |
278 | /* only grow if not in place */ |
279 | if (strbuf_avail(buf) + buf->len < len) | |
280 | strbuf_grow(buf, len - buf->len); | |
5ecd293d | 281 | dst = buf->buf; |
c61dcff9 | 282 | if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) { |
163b9591 JH |
283 | /* |
284 | * If we guessed, we already know we rejected a file with | |
285 | * lone CR, and we can strip a CR without looking at what | |
286 | * follow it. | |
287 | */ | |
201ac8ef | 288 | do { |
ac78e548 | 289 | unsigned char c = *src++; |
201ac8ef | 290 | if (c != '\r') |
ac78e548 | 291 | *dst++ = c; |
5ecd293d | 292 | } while (--len); |
201ac8ef JH |
293 | } else { |
294 | do { | |
ac78e548 | 295 | unsigned char c = *src++; |
5ecd293d | 296 | if (! (c == '\r' && (1 < len && *src == '\n'))) |
ac78e548 | 297 | *dst++ = c; |
5ecd293d | 298 | } while (--len); |
201ac8ef | 299 | } |
5ecd293d PH |
300 | strbuf_setlen(buf, dst - buf->buf); |
301 | return 1; | |
6c510bee LT |
302 | } |
303 | ||
5ecd293d | 304 | static int crlf_to_worktree(const char *path, const char *src, size_t len, |
c61dcff9 | 305 | struct strbuf *buf, enum crlf_action crlf_action) |
6c510bee | 306 | { |
5ecd293d | 307 | char *to_free = NULL; |
6c510bee | 308 | struct text_stat stats; |
6c510bee | 309 | |
c61dcff9 | 310 | if (!len || output_eol(crlf_action) != EOL_CRLF) |
5ecd293d | 311 | return 0; |
6c510bee | 312 | |
5ecd293d | 313 | gather_stats(src, len, &stats); |
6c510bee LT |
314 | |
315 | /* No LF? Nothing to convert, regardless. */ | |
316 | if (!stats.lf) | |
5ecd293d | 317 | return 0; |
6c510bee LT |
318 | |
319 | /* Was it already in CRLF format? */ | |
320 | if (stats.lf == stats.crlf) | |
5ecd293d | 321 | return 0; |
6c510bee | 322 | |
c61dcff9 JH |
323 | if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) { |
324 | if (crlf_action == CRLF_GUESS) { | |
fd6cce9e EB |
325 | /* If we have any CR or CRLF line endings, we do not touch it */ |
326 | /* This is the new safer autocrlf-handling */ | |
327 | if (stats.cr > 0 || stats.crlf > 0) | |
328 | return 0; | |
329 | } | |
c4805393 | 330 | |
a7630bd4 | 331 | if (convert_is_binary(len, &stats)) |
5ecd293d | 332 | return 0; |
201ac8ef | 333 | } |
6c510bee | 334 | |
5ecd293d PH |
335 | /* are we "faking" in place editing ? */ |
336 | if (src == buf->buf) | |
b315c5c0 | 337 | to_free = strbuf_detach(buf, NULL); |
5ecd293d PH |
338 | |
339 | strbuf_grow(buf, len + stats.lf - stats.crlf); | |
340 | for (;;) { | |
341 | const char *nl = memchr(src, '\n', len); | |
342 | if (!nl) | |
343 | break; | |
344 | if (nl > src && nl[-1] == '\r') { | |
345 | strbuf_add(buf, src, nl + 1 - src); | |
346 | } else { | |
347 | strbuf_add(buf, src, nl - src); | |
348 | strbuf_addstr(buf, "\r\n"); | |
349 | } | |
350 | len -= nl + 1 - src; | |
351 | src = nl + 1; | |
352 | } | |
353 | strbuf_add(buf, src, len); | |
354 | ||
355 | free(to_free); | |
356 | return 1; | |
6c510bee | 357 | } |
35ebfd6a | 358 | |
546bb582 JS |
359 | struct filter_params { |
360 | const char *src; | |
361 | unsigned long size; | |
9035d75a | 362 | int fd; |
546bb582 | 363 | const char *cmd; |
a2b665de | 364 | const char *path; |
546bb582 JS |
365 | }; |
366 | ||
9035d75a | 367 | static int filter_buffer_or_fd(int in, int out, void *data) |
aa4ed402 JH |
368 | { |
369 | /* | |
370 | * Spawn cmd and feed the buffer contents through its stdin. | |
371 | */ | |
d3180279 | 372 | struct child_process child_process = CHILD_PROCESS_INIT; |
546bb582 | 373 | struct filter_params *params = (struct filter_params *)data; |
aa4ed402 | 374 | int write_err, status; |
66dbfd55 GV |
375 | const char *argv[] = { NULL, NULL }; |
376 | ||
a2b665de PW |
377 | /* apply % substitution to cmd */ |
378 | struct strbuf cmd = STRBUF_INIT; | |
379 | struct strbuf path = STRBUF_INIT; | |
380 | struct strbuf_expand_dict_entry dict[] = { | |
381 | { "f", NULL, }, | |
382 | { NULL, NULL, }, | |
383 | }; | |
384 | ||
385 | /* quote the path to preserve spaces, etc. */ | |
386 | sq_quote_buf(&path, params->path); | |
387 | dict[0].value = path.buf; | |
388 | ||
389 | /* expand all %f with the quoted path */ | |
390 | strbuf_expand(&cmd, params->cmd, strbuf_expand_dict_cb, &dict); | |
391 | strbuf_release(&path); | |
392 | ||
393 | argv[0] = cmd.buf; | |
aa4ed402 | 394 | |
dc1bfdcd | 395 | child_process.argv = argv; |
ac0ba18d | 396 | child_process.use_shell = 1; |
dc1bfdcd | 397 | child_process.in = -1; |
ae6a5609 | 398 | child_process.out = out; |
aa4ed402 | 399 | |
dc1bfdcd | 400 | if (start_command(&child_process)) |
546bb582 | 401 | return error("cannot fork to run external filter %s", params->cmd); |
aa4ed402 | 402 | |
6424c2ad JB |
403 | sigchain_push(SIGPIPE, SIG_IGN); |
404 | ||
9035d75a | 405 | if (params->src) { |
0c4dd67a JH |
406 | write_err = (write_in_full(child_process.in, |
407 | params->src, params->size) < 0); | |
408 | if (errno == EPIPE) | |
409 | write_err = 0; | |
9035d75a SP |
410 | } else { |
411 | write_err = copy_fd(params->fd, child_process.in); | |
0c4dd67a JH |
412 | if (write_err == COPY_WRITE_ERROR && errno == EPIPE) |
413 | write_err = 0; | |
9035d75a SP |
414 | } |
415 | ||
dc1bfdcd | 416 | if (close(child_process.in)) |
aa4ed402 JH |
417 | write_err = 1; |
418 | if (write_err) | |
546bb582 | 419 | error("cannot feed the input to external filter %s", params->cmd); |
aa4ed402 | 420 | |
6424c2ad JB |
421 | sigchain_pop(SIGPIPE); |
422 | ||
aa4ed402 JH |
423 | status = finish_command(&child_process); |
424 | if (status) | |
5709e036 | 425 | error("external filter %s failed %d", params->cmd, status); |
a2b665de PW |
426 | |
427 | strbuf_release(&cmd); | |
aa4ed402 JH |
428 | return (write_err || status); |
429 | } | |
430 | ||
9035d75a | 431 | static int apply_filter(const char *path, const char *src, size_t len, int fd, |
5ecd293d | 432 | struct strbuf *dst, const char *cmd) |
aa4ed402 JH |
433 | { |
434 | /* | |
435 | * Create a pipeline to have the command filter the buffer's | |
436 | * contents. | |
437 | * | |
438 | * (child --> cmd) --> us | |
439 | */ | |
546bb582 | 440 | int ret = 1; |
f285a2d7 | 441 | struct strbuf nbuf = STRBUF_INIT; |
546bb582 JS |
442 | struct async async; |
443 | struct filter_params params; | |
aa4ed402 JH |
444 | |
445 | if (!cmd) | |
5ecd293d | 446 | return 0; |
aa4ed402 | 447 | |
92ac3197 JK |
448 | if (!dst) |
449 | return 1; | |
450 | ||
546bb582 | 451 | memset(&async, 0, sizeof(async)); |
9035d75a | 452 | async.proc = filter_buffer_or_fd; |
546bb582 | 453 | async.data = ¶ms; |
ae6a5609 | 454 | async.out = -1; |
546bb582 JS |
455 | params.src = src; |
456 | params.size = len; | |
9035d75a | 457 | params.fd = fd; |
546bb582 | 458 | params.cmd = cmd; |
a2b665de | 459 | params.path = path; |
aa4ed402 JH |
460 | |
461 | fflush(NULL); | |
546bb582 JS |
462 | if (start_async(&async)) |
463 | return 0; /* error was already reported */ | |
aa4ed402 | 464 | |
546bb582 | 465 | if (strbuf_read(&nbuf, async.out, len) < 0) { |
5ecd293d PH |
466 | error("read from external filter %s failed", cmd); |
467 | ret = 0; | |
aa4ed402 | 468 | } |
546bb582 | 469 | if (close(async.out)) { |
90d16ec0 | 470 | error("read from external filter %s failed", cmd); |
5ecd293d | 471 | ret = 0; |
aa4ed402 | 472 | } |
546bb582 JS |
473 | if (finish_async(&async)) { |
474 | error("external filter %s failed", cmd); | |
5ecd293d | 475 | ret = 0; |
aa4ed402 JH |
476 | } |
477 | ||
5ecd293d | 478 | if (ret) { |
90d16ec0 | 479 | strbuf_swap(dst, &nbuf); |
5ecd293d | 480 | } |
90d16ec0 | 481 | strbuf_release(&nbuf); |
5ecd293d | 482 | return ret; |
aa4ed402 JH |
483 | } |
484 | ||
485 | static struct convert_driver { | |
486 | const char *name; | |
487 | struct convert_driver *next; | |
cd8be6c9 BH |
488 | const char *smudge; |
489 | const char *clean; | |
36daaaca | 490 | int required; |
aa4ed402 JH |
491 | } *user_convert, **user_convert_tail; |
492 | ||
ef90d6d4 | 493 | static int read_convert_config(const char *var, const char *value, void *cb) |
aa4ed402 | 494 | { |
d731f0ad | 495 | const char *key, *name; |
aa4ed402 JH |
496 | int namelen; |
497 | struct convert_driver *drv; | |
498 | ||
499 | /* | |
500 | * External conversion drivers are configured using | |
501 | * "filter.<name>.variable". | |
502 | */ | |
d731f0ad | 503 | if (parse_config_key(var, "filter", &name, &namelen, &key) < 0 || !name) |
aa4ed402 | 504 | return 0; |
aa4ed402 JH |
505 | for (drv = user_convert; drv; drv = drv->next) |
506 | if (!strncmp(drv->name, name, namelen) && !drv->name[namelen]) | |
507 | break; | |
508 | if (!drv) { | |
aa4ed402 | 509 | drv = xcalloc(1, sizeof(struct convert_driver)); |
182af834 | 510 | drv->name = xmemdupz(name, namelen); |
aa4ed402 JH |
511 | *user_convert_tail = drv; |
512 | user_convert_tail = &(drv->next); | |
513 | } | |
514 | ||
aa4ed402 JH |
515 | /* |
516 | * filter.<name>.smudge and filter.<name>.clean specifies | |
517 | * the command line: | |
518 | * | |
519 | * command-line | |
520 | * | |
521 | * The command-line will not be interpolated in any way. | |
522 | */ | |
523 | ||
d731f0ad | 524 | if (!strcmp("smudge", key)) |
cd8be6c9 BH |
525 | return git_config_string(&drv->smudge, var, value); |
526 | ||
d731f0ad | 527 | if (!strcmp("clean", key)) |
cd8be6c9 | 528 | return git_config_string(&drv->clean, var, value); |
aa4ed402 | 529 | |
d731f0ad | 530 | if (!strcmp("required", key)) { |
36daaaca JB |
531 | drv->required = git_config_bool(var, value); |
532 | return 0; | |
533 | } | |
534 | ||
aa4ed402 JH |
535 | return 0; |
536 | } | |
537 | ||
3fed15f5 JH |
538 | static int count_ident(const char *cp, unsigned long size) |
539 | { | |
540 | /* | |
af9b54bb | 541 | * "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$" |
3fed15f5 JH |
542 | */ |
543 | int cnt = 0; | |
544 | char ch; | |
545 | ||
546 | while (size) { | |
547 | ch = *cp++; | |
548 | size--; | |
549 | if (ch != '$') | |
550 | continue; | |
af9b54bb | 551 | if (size < 3) |
3fed15f5 | 552 | break; |
af9b54bb | 553 | if (memcmp("Id", cp, 2)) |
3fed15f5 | 554 | continue; |
af9b54bb AP |
555 | ch = cp[2]; |
556 | cp += 3; | |
557 | size -= 3; | |
3fed15f5 | 558 | if (ch == '$') |
af9b54bb | 559 | cnt++; /* $Id$ */ |
3fed15f5 JH |
560 | if (ch != ':') |
561 | continue; | |
562 | ||
563 | /* | |
af9b54bb | 564 | * "$Id: ... "; scan up to the closing dollar sign and discard. |
3fed15f5 JH |
565 | */ |
566 | while (size) { | |
567 | ch = *cp++; | |
568 | size--; | |
569 | if (ch == '$') { | |
570 | cnt++; | |
571 | break; | |
572 | } | |
a9f3049f HG |
573 | if (ch == '\n') |
574 | break; | |
3fed15f5 JH |
575 | } |
576 | } | |
577 | return cnt; | |
578 | } | |
579 | ||
5ecd293d PH |
580 | static int ident_to_git(const char *path, const char *src, size_t len, |
581 | struct strbuf *buf, int ident) | |
3fed15f5 | 582 | { |
5ecd293d | 583 | char *dst, *dollar; |
3fed15f5 | 584 | |
4c3b57b9 | 585 | if (!ident || (src && !count_ident(src, len))) |
5ecd293d PH |
586 | return 0; |
587 | ||
92ac3197 JK |
588 | if (!buf) |
589 | return 1; | |
590 | ||
90d16ec0 PH |
591 | /* only grow if not in place */ |
592 | if (strbuf_avail(buf) + buf->len < len) | |
593 | strbuf_grow(buf, len - buf->len); | |
5ecd293d PH |
594 | dst = buf->buf; |
595 | for (;;) { | |
596 | dollar = memchr(src, '$', len); | |
597 | if (!dollar) | |
598 | break; | |
77321184 | 599 | memmove(dst, src, dollar + 1 - src); |
5ecd293d PH |
600 | dst += dollar + 1 - src; |
601 | len -= dollar + 1 - src; | |
602 | src = dollar + 1; | |
603 | ||
604 | if (len > 3 && !memcmp(src, "Id:", 3)) { | |
605 | dollar = memchr(src + 3, '$', len - 3); | |
606 | if (!dollar) | |
607 | break; | |
a9f3049f HG |
608 | if (memchr(src + 3, '\n', dollar - src - 3)) { |
609 | /* Line break before the next dollar. */ | |
610 | continue; | |
611 | } | |
612 | ||
af9b54bb AP |
613 | memcpy(dst, "Id$", 3); |
614 | dst += 3; | |
5ecd293d PH |
615 | len -= dollar + 1 - src; |
616 | src = dollar + 1; | |
3fed15f5 JH |
617 | } |
618 | } | |
77321184 | 619 | memmove(dst, src, len); |
5ecd293d PH |
620 | strbuf_setlen(buf, dst + len - buf->buf); |
621 | return 1; | |
3fed15f5 JH |
622 | } |
623 | ||
5ecd293d PH |
624 | static int ident_to_worktree(const char *path, const char *src, size_t len, |
625 | struct strbuf *buf, int ident) | |
3fed15f5 | 626 | { |
3fed15f5 | 627 | unsigned char sha1[20]; |
07814d90 | 628 | char *to_free = NULL, *dollar, *spc; |
5ecd293d | 629 | int cnt; |
3fed15f5 JH |
630 | |
631 | if (!ident) | |
5ecd293d | 632 | return 0; |
3fed15f5 | 633 | |
5ecd293d | 634 | cnt = count_ident(src, len); |
3fed15f5 | 635 | if (!cnt) |
5ecd293d | 636 | return 0; |
3fed15f5 | 637 | |
5ecd293d PH |
638 | /* are we "faking" in place editing ? */ |
639 | if (src == buf->buf) | |
b315c5c0 | 640 | to_free = strbuf_detach(buf, NULL); |
5ecd293d | 641 | hash_sha1_file(src, len, "blob", sha1); |
3fed15f5 | 642 | |
5ecd293d PH |
643 | strbuf_grow(buf, len + cnt * 43); |
644 | for (;;) { | |
645 | /* step 1: run to the next '$' */ | |
646 | dollar = memchr(src, '$', len); | |
647 | if (!dollar) | |
648 | break; | |
649 | strbuf_add(buf, src, dollar + 1 - src); | |
650 | len -= dollar + 1 - src; | |
651 | src = dollar + 1; | |
c23290d5 | 652 | |
5ecd293d PH |
653 | /* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */ |
654 | if (len < 3 || memcmp("Id", src, 2)) | |
3fed15f5 JH |
655 | continue; |
656 | ||
5ecd293d PH |
657 | /* step 3: skip over Id$ or Id:xxxxx$ */ |
658 | if (src[2] == '$') { | |
659 | src += 3; | |
660 | len -= 3; | |
661 | } else if (src[2] == ':') { | |
662 | /* | |
663 | * It's possible that an expanded Id has crept its way into the | |
07814d90 HG |
664 | * repository, we cope with that by stripping the expansion out. |
665 | * This is probably not a good idea, since it will cause changes | |
666 | * on checkout, which won't go away by stash, but let's keep it | |
667 | * for git-style ids. | |
5ecd293d PH |
668 | */ |
669 | dollar = memchr(src + 3, '$', len - 3); | |
670 | if (!dollar) { | |
671 | /* incomplete keyword, no more '$', so just quit the loop */ | |
672 | break; | |
673 | } | |
c23290d5 | 674 | |
a9f3049f HG |
675 | if (memchr(src + 3, '\n', dollar - src - 3)) { |
676 | /* Line break before the next dollar. */ | |
677 | continue; | |
678 | } | |
679 | ||
07814d90 HG |
680 | spc = memchr(src + 4, ' ', dollar - src - 4); |
681 | if (spc && spc < dollar-1) { | |
682 | /* There are spaces in unexpected places. | |
683 | * This is probably an id from some other | |
684 | * versioning system. Keep it for now. | |
685 | */ | |
686 | continue; | |
687 | } | |
688 | ||
5ecd293d PH |
689 | len -= dollar + 1 - src; |
690 | src = dollar + 1; | |
691 | } else { | |
692 | /* it wasn't a "Id$" or "Id:xxxx$" */ | |
693 | continue; | |
694 | } | |
c23290d5 | 695 | |
5ecd293d PH |
696 | /* step 4: substitute */ |
697 | strbuf_addstr(buf, "Id: "); | |
698 | strbuf_add(buf, sha1_to_hex(sha1), 40); | |
699 | strbuf_addstr(buf, " $"); | |
3fed15f5 | 700 | } |
5ecd293d | 701 | strbuf_add(buf, src, len); |
3fed15f5 | 702 | |
5ecd293d PH |
703 | free(to_free); |
704 | return 1; | |
35ebfd6a JH |
705 | } |
706 | ||
92cce135 | 707 | static enum crlf_action git_path_check_crlf(struct git_attr_check *check) |
35ebfd6a | 708 | { |
6073ee85 JH |
709 | const char *value = check->value; |
710 | ||
711 | if (ATTR_TRUE(value)) | |
712 | return CRLF_TEXT; | |
713 | else if (ATTR_FALSE(value)) | |
714 | return CRLF_BINARY; | |
715 | else if (ATTR_UNSET(value)) | |
716 | ; | |
717 | else if (!strcmp(value, "input")) | |
718 | return CRLF_INPUT; | |
fd6cce9e EB |
719 | else if (!strcmp(value, "auto")) |
720 | return CRLF_AUTO; | |
163b9591 | 721 | return CRLF_GUESS; |
35ebfd6a JH |
722 | } |
723 | ||
92cce135 | 724 | static enum eol git_path_check_eol(struct git_attr_check *check) |
fd6cce9e EB |
725 | { |
726 | const char *value = check->value; | |
727 | ||
728 | if (ATTR_UNSET(value)) | |
729 | ; | |
730 | else if (!strcmp(value, "lf")) | |
731 | return EOL_LF; | |
732 | else if (!strcmp(value, "crlf")) | |
733 | return EOL_CRLF; | |
734 | return EOL_UNSET; | |
735 | } | |
736 | ||
92cce135 | 737 | static struct convert_driver *git_path_check_convert(struct git_attr_check *check) |
aa4ed402 JH |
738 | { |
739 | const char *value = check->value; | |
740 | struct convert_driver *drv; | |
741 | ||
742 | if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value)) | |
743 | return NULL; | |
744 | for (drv = user_convert; drv; drv = drv->next) | |
745 | if (!strcmp(value, drv->name)) | |
746 | return drv; | |
747 | return NULL; | |
748 | } | |
749 | ||
92cce135 | 750 | static int git_path_check_ident(struct git_attr_check *check) |
3fed15f5 JH |
751 | { |
752 | const char *value = check->value; | |
753 | ||
754 | return !!ATTR_TRUE(value); | |
755 | } | |
756 | ||
3bfba20d JH |
757 | struct conv_attrs { |
758 | struct convert_driver *drv; | |
bb211b4d TB |
759 | enum crlf_action attr_action; /* What attr says */ |
760 | enum crlf_action crlf_action; /* When no attr is set, use core.autocrlf */ | |
3bfba20d JH |
761 | int ident; |
762 | }; | |
763 | ||
83295964 JH |
764 | static const char *conv_attr_name[] = { |
765 | "crlf", "ident", "filter", "eol", "text", | |
766 | }; | |
767 | #define NUM_CONV_ATTRS ARRAY_SIZE(conv_attr_name) | |
768 | ||
3bfba20d | 769 | static void convert_attrs(struct conv_attrs *ca, const char *path) |
83295964 JH |
770 | { |
771 | int i; | |
772 | static struct git_attr_check ccheck[NUM_CONV_ATTRS]; | |
773 | ||
774 | if (!ccheck[0].attr) { | |
775 | for (i = 0; i < NUM_CONV_ATTRS; i++) | |
776 | ccheck[i].attr = git_attr(conv_attr_name[i]); | |
777 | user_convert_tail = &user_convert; | |
778 | git_config(read_convert_config, NULL); | |
779 | } | |
3bfba20d | 780 | |
d932f4eb | 781 | if (!git_check_attr(path, NUM_CONV_ATTRS, ccheck)) { |
bb211b4d TB |
782 | enum eol eol_attr; |
783 | ca->crlf_action = git_path_check_crlf(ccheck + 4); | |
3bfba20d | 784 | if (ca->crlf_action == CRLF_GUESS) |
92cce135 | 785 | ca->crlf_action = git_path_check_crlf(ccheck + 0); |
bb211b4d | 786 | ca->attr_action = ca->crlf_action; |
92cce135 TB |
787 | ca->ident = git_path_check_ident(ccheck + 1); |
788 | ca->drv = git_path_check_convert(ccheck + 2); | |
bb211b4d TB |
789 | if (ca->crlf_action == CRLF_BINARY) |
790 | return; | |
791 | eol_attr = git_path_check_eol(ccheck + 3); | |
792 | if (eol_attr == EOL_LF) | |
793 | ca->crlf_action = CRLF_INPUT; | |
794 | else if (eol_attr == EOL_CRLF) | |
795 | ca->crlf_action = CRLF_CRLF; | |
3bfba20d JH |
796 | } else { |
797 | ca->drv = NULL; | |
798 | ca->crlf_action = CRLF_GUESS; | |
3bfba20d JH |
799 | ca->ident = 0; |
800 | } | |
83295964 JH |
801 | } |
802 | ||
9035d75a SP |
803 | int would_convert_to_git_filter_fd(const char *path) |
804 | { | |
805 | struct conv_attrs ca; | |
806 | ||
807 | convert_attrs(&ca, path); | |
808 | if (!ca.drv) | |
809 | return 0; | |
810 | ||
811 | /* | |
812 | * Apply a filter to an fd only if the filter is required to succeed. | |
813 | * We must die if the filter fails, because the original data before | |
814 | * filtering is not available. | |
815 | */ | |
816 | if (!ca.drv->required) | |
817 | return 0; | |
818 | ||
819 | return apply_filter(path, NULL, 0, -1, NULL, ca.drv->clean); | |
820 | } | |
821 | ||
a7630bd4 TB |
822 | const char *get_convert_attr_ascii(const char *path) |
823 | { | |
824 | struct conv_attrs ca; | |
a7630bd4 TB |
825 | |
826 | convert_attrs(&ca, path); | |
bb211b4d | 827 | switch (ca.attr_action) { |
a7630bd4 TB |
828 | case CRLF_GUESS: |
829 | return ""; | |
830 | case CRLF_BINARY: | |
831 | return "-text"; | |
832 | case CRLF_TEXT: | |
833 | return "text"; | |
834 | case CRLF_INPUT: | |
835 | return "text eol=lf"; | |
836 | case CRLF_CRLF: | |
837 | return "text=auto eol=crlf"; | |
838 | case CRLF_AUTO: | |
839 | return "text=auto"; | |
840 | } | |
841 | return ""; | |
842 | } | |
843 | ||
21e5ad50 SP |
844 | int convert_to_git(const char *path, const char *src, size_t len, |
845 | struct strbuf *dst, enum safe_crlf checksafe) | |
35ebfd6a | 846 | { |
3bfba20d | 847 | int ret = 0; |
cd8be6c9 | 848 | const char *filter = NULL; |
36daaaca | 849 | int required = 0; |
3bfba20d | 850 | struct conv_attrs ca; |
6073ee85 | 851 | |
3bfba20d | 852 | convert_attrs(&ca, path); |
36daaaca | 853 | if (ca.drv) { |
3bfba20d | 854 | filter = ca.drv->clean; |
36daaaca JB |
855 | required = ca.drv->required; |
856 | } | |
3fed15f5 | 857 | |
9035d75a | 858 | ret |= apply_filter(path, src, len, -1, dst, filter); |
36daaaca JB |
859 | if (!ret && required) |
860 | die("%s: clean filter '%s' failed", path, ca.drv->name); | |
861 | ||
92ac3197 | 862 | if (ret && dst) { |
5ecd293d PH |
863 | src = dst->buf; |
864 | len = dst->len; | |
aa4ed402 | 865 | } |
3bfba20d | 866 | ret |= crlf_to_git(path, src, len, dst, ca.crlf_action, checksafe); |
92ac3197 | 867 | if (ret && dst) { |
5ecd293d PH |
868 | src = dst->buf; |
869 | len = dst->len; | |
6073ee85 | 870 | } |
3bfba20d | 871 | return ret | ident_to_git(path, src, len, dst, ca.ident); |
35ebfd6a JH |
872 | } |
873 | ||
9035d75a SP |
874 | void convert_to_git_filter_fd(const char *path, int fd, struct strbuf *dst, |
875 | enum safe_crlf checksafe) | |
876 | { | |
877 | struct conv_attrs ca; | |
878 | convert_attrs(&ca, path); | |
879 | ||
880 | assert(ca.drv); | |
881 | assert(ca.drv->clean); | |
882 | ||
883 | if (!apply_filter(path, NULL, 0, fd, dst, ca.drv->clean)) | |
884 | die("%s: clean filter '%s' failed", path, ca.drv->name); | |
885 | ||
9035d75a SP |
886 | crlf_to_git(path, dst->buf, dst->len, dst, ca.crlf_action, checksafe); |
887 | ident_to_git(path, dst->buf, dst->len, dst, ca.ident); | |
888 | } | |
889 | ||
43dd2332 EB |
890 | static int convert_to_working_tree_internal(const char *path, const char *src, |
891 | size_t len, struct strbuf *dst, | |
892 | int normalizing) | |
35ebfd6a | 893 | { |
36daaaca | 894 | int ret = 0, ret_filter = 0; |
cd8be6c9 | 895 | const char *filter = NULL; |
36daaaca | 896 | int required = 0; |
3bfba20d | 897 | struct conv_attrs ca; |
6073ee85 | 898 | |
3bfba20d | 899 | convert_attrs(&ca, path); |
36daaaca | 900 | if (ca.drv) { |
3bfba20d | 901 | filter = ca.drv->smudge; |
36daaaca JB |
902 | required = ca.drv->required; |
903 | } | |
3fed15f5 | 904 | |
3bfba20d | 905 | ret |= ident_to_worktree(path, src, len, dst, ca.ident); |
5ecd293d PH |
906 | if (ret) { |
907 | src = dst->buf; | |
908 | len = dst->len; | |
3fed15f5 | 909 | } |
43dd2332 EB |
910 | /* |
911 | * CRLF conversion can be skipped if normalizing, unless there | |
912 | * is a smudge filter. The filter might expect CRLFs. | |
913 | */ | |
914 | if (filter || !normalizing) { | |
3bfba20d | 915 | ret |= crlf_to_worktree(path, src, len, dst, ca.crlf_action); |
43dd2332 EB |
916 | if (ret) { |
917 | src = dst->buf; | |
918 | len = dst->len; | |
919 | } | |
aa4ed402 | 920 | } |
36daaaca | 921 | |
9035d75a | 922 | ret_filter = apply_filter(path, src, len, -1, dst, filter); |
36daaaca JB |
923 | if (!ret_filter && required) |
924 | die("%s: smudge filter %s failed", path, ca.drv->name); | |
925 | ||
926 | return ret | ret_filter; | |
35ebfd6a | 927 | } |
f217f0e8 | 928 | |
43dd2332 EB |
929 | int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst) |
930 | { | |
931 | return convert_to_working_tree_internal(path, src, len, dst, 0); | |
932 | } | |
933 | ||
f217f0e8 EB |
934 | int renormalize_buffer(const char *path, const char *src, size_t len, struct strbuf *dst) |
935 | { | |
43dd2332 | 936 | int ret = convert_to_working_tree_internal(path, src, len, dst, 1); |
f217f0e8 EB |
937 | if (ret) { |
938 | src = dst->buf; | |
939 | len = dst->len; | |
940 | } | |
7356b51e | 941 | return ret | convert_to_git(path, src, len, dst, SAFE_CRLF_FALSE); |
f217f0e8 | 942 | } |
dd8e9121 | 943 | |
b6691092 JH |
944 | /***************************************************************** |
945 | * | |
749f763d | 946 | * Streaming conversion support |
b6691092 JH |
947 | * |
948 | *****************************************************************/ | |
949 | ||
950 | typedef int (*filter_fn)(struct stream_filter *, | |
951 | const char *input, size_t *isize_p, | |
952 | char *output, size_t *osize_p); | |
953 | typedef void (*free_fn)(struct stream_filter *); | |
954 | ||
955 | struct stream_filter_vtbl { | |
956 | filter_fn filter; | |
957 | free_fn free; | |
958 | }; | |
959 | ||
960 | struct stream_filter { | |
961 | struct stream_filter_vtbl *vtbl; | |
962 | }; | |
963 | ||
964 | static int null_filter_fn(struct stream_filter *filter, | |
965 | const char *input, size_t *isize_p, | |
966 | char *output, size_t *osize_p) | |
967 | { | |
4ae66704 JH |
968 | size_t count; |
969 | ||
970 | if (!input) | |
971 | return 0; /* we do not keep any states */ | |
972 | count = *isize_p; | |
b6691092 JH |
973 | if (*osize_p < count) |
974 | count = *osize_p; | |
975 | if (count) { | |
976 | memmove(output, input, count); | |
977 | *isize_p -= count; | |
978 | *osize_p -= count; | |
979 | } | |
980 | return 0; | |
981 | } | |
982 | ||
983 | static void null_free_fn(struct stream_filter *filter) | |
984 | { | |
985 | ; /* nothing -- null instances are shared */ | |
986 | } | |
987 | ||
988 | static struct stream_filter_vtbl null_vtbl = { | |
989 | null_filter_fn, | |
990 | null_free_fn, | |
991 | }; | |
992 | ||
993 | static struct stream_filter null_filter_singleton = { | |
994 | &null_vtbl, | |
995 | }; | |
996 | ||
997 | int is_null_stream_filter(struct stream_filter *filter) | |
998 | { | |
999 | return filter == &null_filter_singleton; | |
1000 | } | |
1001 | ||
b84c7839 JH |
1002 | |
1003 | /* | |
1004 | * LF-to-CRLF filter | |
1005 | */ | |
284e3d28 CMN |
1006 | |
1007 | struct lf_to_crlf_filter { | |
1008 | struct stream_filter filter; | |
8496f568 JH |
1009 | unsigned has_held:1; |
1010 | char held; | |
284e3d28 CMN |
1011 | }; |
1012 | ||
e322ee38 JH |
1013 | static int lf_to_crlf_filter_fn(struct stream_filter *filter, |
1014 | const char *input, size_t *isize_p, | |
1015 | char *output, size_t *osize_p) | |
1016 | { | |
284e3d28 CMN |
1017 | size_t count, o = 0; |
1018 | struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter; | |
1019 | ||
8496f568 JH |
1020 | /* |
1021 | * We may be holding onto the CR to see if it is followed by a | |
1022 | * LF, in which case we would need to go to the main loop. | |
1023 | * Otherwise, just emit it to the output stream. | |
1024 | */ | |
1025 | if (lf_to_crlf->has_held && (lf_to_crlf->held != '\r' || !input)) { | |
1026 | output[o++] = lf_to_crlf->held; | |
1027 | lf_to_crlf->has_held = 0; | |
284e3d28 | 1028 | } |
e322ee38 | 1029 | |
87afe9a5 JH |
1030 | /* We are told to drain */ |
1031 | if (!input) { | |
1032 | *osize_p -= o; | |
1033 | return 0; | |
1034 | } | |
e322ee38 | 1035 | |
e322ee38 | 1036 | count = *isize_p; |
8496f568 | 1037 | if (count || lf_to_crlf->has_held) { |
284e3d28 | 1038 | size_t i; |
8496f568 JH |
1039 | int was_cr = 0; |
1040 | ||
1041 | if (lf_to_crlf->has_held) { | |
1042 | was_cr = 1; | |
1043 | lf_to_crlf->has_held = 0; | |
1044 | } | |
1045 | ||
284e3d28 | 1046 | for (i = 0; o < *osize_p && i < count; i++) { |
e322ee38 | 1047 | char ch = input[i]; |
8496f568 | 1048 | |
e322ee38 | 1049 | if (ch == '\n') { |
284e3d28 | 1050 | output[o++] = '\r'; |
8496f568 JH |
1051 | } else if (was_cr) { |
1052 | /* | |
1053 | * Previous round saw CR and it is not followed | |
1054 | * by a LF; emit the CR before processing the | |
1055 | * current character. | |
1056 | */ | |
1057 | output[o++] = '\r'; | |
e322ee38 | 1058 | } |
8496f568 JH |
1059 | |
1060 | /* | |
1061 | * We may have consumed the last output slot, | |
1062 | * in which case we need to break out of this | |
1063 | * loop; hold the current character before | |
1064 | * returning. | |
1065 | */ | |
1066 | if (*osize_p <= o) { | |
1067 | lf_to_crlf->has_held = 1; | |
1068 | lf_to_crlf->held = ch; | |
1069 | continue; /* break but increment i */ | |
1070 | } | |
1071 | ||
1072 | if (ch == '\r') { | |
1073 | was_cr = 1; | |
1074 | continue; | |
1075 | } | |
1076 | ||
1077 | was_cr = 0; | |
e322ee38 JH |
1078 | output[o++] = ch; |
1079 | } | |
1080 | ||
1081 | *osize_p -= o; | |
1082 | *isize_p -= i; | |
8496f568 JH |
1083 | |
1084 | if (!lf_to_crlf->has_held && was_cr) { | |
1085 | lf_to_crlf->has_held = 1; | |
1086 | lf_to_crlf->held = '\r'; | |
1087 | } | |
e322ee38 JH |
1088 | } |
1089 | return 0; | |
1090 | } | |
1091 | ||
284e3d28 CMN |
1092 | static void lf_to_crlf_free_fn(struct stream_filter *filter) |
1093 | { | |
1094 | free(filter); | |
1095 | } | |
1096 | ||
e322ee38 JH |
1097 | static struct stream_filter_vtbl lf_to_crlf_vtbl = { |
1098 | lf_to_crlf_filter_fn, | |
284e3d28 | 1099 | lf_to_crlf_free_fn, |
e322ee38 JH |
1100 | }; |
1101 | ||
284e3d28 CMN |
1102 | static struct stream_filter *lf_to_crlf_filter(void) |
1103 | { | |
87afe9a5 | 1104 | struct lf_to_crlf_filter *lf_to_crlf = xcalloc(1, sizeof(*lf_to_crlf)); |
e322ee38 | 1105 | |
284e3d28 | 1106 | lf_to_crlf->filter.vtbl = &lf_to_crlf_vtbl; |
284e3d28 CMN |
1107 | return (struct stream_filter *)lf_to_crlf; |
1108 | } | |
b84c7839 | 1109 | |
a265a7f9 JH |
1110 | /* |
1111 | * Cascade filter | |
1112 | */ | |
1113 | #define FILTER_BUFFER 1024 | |
1114 | struct cascade_filter { | |
1115 | struct stream_filter filter; | |
1116 | struct stream_filter *one; | |
1117 | struct stream_filter *two; | |
1118 | char buf[FILTER_BUFFER]; | |
1119 | int end, ptr; | |
1120 | }; | |
1121 | ||
1122 | static int cascade_filter_fn(struct stream_filter *filter, | |
1123 | const char *input, size_t *isize_p, | |
1124 | char *output, size_t *osize_p) | |
1125 | { | |
1126 | struct cascade_filter *cas = (struct cascade_filter *) filter; | |
1127 | size_t filled = 0; | |
1128 | size_t sz = *osize_p; | |
1129 | size_t to_feed, remaining; | |
1130 | ||
1131 | /* | |
1132 | * input -- (one) --> buf -- (two) --> output | |
1133 | */ | |
1134 | while (filled < sz) { | |
1135 | remaining = sz - filled; | |
1136 | ||
1137 | /* do we already have something to feed two with? */ | |
1138 | if (cas->ptr < cas->end) { | |
1139 | to_feed = cas->end - cas->ptr; | |
1140 | if (stream_filter(cas->two, | |
1141 | cas->buf + cas->ptr, &to_feed, | |
1142 | output + filled, &remaining)) | |
1143 | return -1; | |
1144 | cas->ptr += (cas->end - cas->ptr) - to_feed; | |
1145 | filled = sz - remaining; | |
1146 | continue; | |
1147 | } | |
1148 | ||
1149 | /* feed one from upstream and have it emit into our buffer */ | |
1150 | to_feed = input ? *isize_p : 0; | |
1151 | if (input && !to_feed) | |
1152 | break; | |
1153 | remaining = sizeof(cas->buf); | |
1154 | if (stream_filter(cas->one, | |
1155 | input, &to_feed, | |
1156 | cas->buf, &remaining)) | |
1157 | return -1; | |
1158 | cas->end = sizeof(cas->buf) - remaining; | |
1159 | cas->ptr = 0; | |
1160 | if (input) { | |
1161 | size_t fed = *isize_p - to_feed; | |
1162 | *isize_p -= fed; | |
1163 | input += fed; | |
1164 | } | |
1165 | ||
1166 | /* do we know that we drained one completely? */ | |
1167 | if (input || cas->end) | |
1168 | continue; | |
1169 | ||
1170 | /* tell two to drain; we have nothing more to give it */ | |
1171 | to_feed = 0; | |
1172 | remaining = sz - filled; | |
1173 | if (stream_filter(cas->two, | |
1174 | NULL, &to_feed, | |
1175 | output + filled, &remaining)) | |
1176 | return -1; | |
1177 | if (remaining == (sz - filled)) | |
1178 | break; /* completely drained two */ | |
1179 | filled = sz - remaining; | |
1180 | } | |
1181 | *osize_p -= filled; | |
1182 | return 0; | |
1183 | } | |
1184 | ||
1185 | static void cascade_free_fn(struct stream_filter *filter) | |
1186 | { | |
1187 | struct cascade_filter *cas = (struct cascade_filter *)filter; | |
1188 | free_stream_filter(cas->one); | |
1189 | free_stream_filter(cas->two); | |
1190 | free(filter); | |
1191 | } | |
1192 | ||
1193 | static struct stream_filter_vtbl cascade_vtbl = { | |
1194 | cascade_filter_fn, | |
1195 | cascade_free_fn, | |
1196 | }; | |
1197 | ||
1198 | static struct stream_filter *cascade_filter(struct stream_filter *one, | |
1199 | struct stream_filter *two) | |
1200 | { | |
1201 | struct cascade_filter *cascade; | |
1202 | ||
1203 | if (!one || is_null_stream_filter(one)) | |
1204 | return two; | |
1205 | if (!two || is_null_stream_filter(two)) | |
1206 | return one; | |
1207 | ||
1208 | cascade = xmalloc(sizeof(*cascade)); | |
1209 | cascade->one = one; | |
1210 | cascade->two = two; | |
1211 | cascade->end = cascade->ptr = 0; | |
1212 | cascade->filter.vtbl = &cascade_vtbl; | |
1213 | return (struct stream_filter *)cascade; | |
1214 | } | |
1215 | ||
b84c7839 JH |
1216 | /* |
1217 | * ident filter | |
1218 | */ | |
1219 | #define IDENT_DRAINING (-1) | |
1220 | #define IDENT_SKIPPING (-2) | |
1221 | struct ident_filter { | |
1222 | struct stream_filter filter; | |
1223 | struct strbuf left; | |
1224 | int state; | |
1225 | char ident[45]; /* ": x40 $" */ | |
1226 | }; | |
1227 | ||
1228 | static int is_foreign_ident(const char *str) | |
1229 | { | |
1230 | int i; | |
1231 | ||
ae021d87 | 1232 | if (!skip_prefix(str, "$Id: ", &str)) |
b84c7839 | 1233 | return 0; |
ae021d87 | 1234 | for (i = 0; str[i]; i++) { |
b84c7839 JH |
1235 | if (isspace(str[i]) && str[i+1] != '$') |
1236 | return 1; | |
1237 | } | |
1238 | return 0; | |
1239 | } | |
1240 | ||
1241 | static void ident_drain(struct ident_filter *ident, char **output_p, size_t *osize_p) | |
1242 | { | |
1243 | size_t to_drain = ident->left.len; | |
1244 | ||
1245 | if (*osize_p < to_drain) | |
1246 | to_drain = *osize_p; | |
1247 | if (to_drain) { | |
1248 | memcpy(*output_p, ident->left.buf, to_drain); | |
1249 | strbuf_remove(&ident->left, 0, to_drain); | |
1250 | *output_p += to_drain; | |
1251 | *osize_p -= to_drain; | |
1252 | } | |
1253 | if (!ident->left.len) | |
1254 | ident->state = 0; | |
1255 | } | |
1256 | ||
1257 | static int ident_filter_fn(struct stream_filter *filter, | |
1258 | const char *input, size_t *isize_p, | |
1259 | char *output, size_t *osize_p) | |
1260 | { | |
1261 | struct ident_filter *ident = (struct ident_filter *)filter; | |
1262 | static const char head[] = "$Id"; | |
1263 | ||
1264 | if (!input) { | |
1265 | /* drain upon eof */ | |
1266 | switch (ident->state) { | |
1267 | default: | |
1268 | strbuf_add(&ident->left, head, ident->state); | |
1269 | case IDENT_SKIPPING: | |
1270 | /* fallthru */ | |
1271 | case IDENT_DRAINING: | |
1272 | ident_drain(ident, &output, osize_p); | |
1273 | } | |
1274 | return 0; | |
1275 | } | |
1276 | ||
1277 | while (*isize_p || (ident->state == IDENT_DRAINING)) { | |
1278 | int ch; | |
1279 | ||
1280 | if (ident->state == IDENT_DRAINING) { | |
1281 | ident_drain(ident, &output, osize_p); | |
1282 | if (!*osize_p) | |
1283 | break; | |
1284 | continue; | |
1285 | } | |
1286 | ||
1287 | ch = *(input++); | |
1288 | (*isize_p)--; | |
1289 | ||
1290 | if (ident->state == IDENT_SKIPPING) { | |
1291 | /* | |
1292 | * Skipping until '$' or LF, but keeping them | |
1293 | * in case it is a foreign ident. | |
1294 | */ | |
1295 | strbuf_addch(&ident->left, ch); | |
1296 | if (ch != '\n' && ch != '$') | |
1297 | continue; | |
1298 | if (ch == '$' && !is_foreign_ident(ident->left.buf)) { | |
1299 | strbuf_setlen(&ident->left, sizeof(head) - 1); | |
1300 | strbuf_addstr(&ident->left, ident->ident); | |
1301 | } | |
1302 | ident->state = IDENT_DRAINING; | |
1303 | continue; | |
1304 | } | |
1305 | ||
1306 | if (ident->state < sizeof(head) && | |
1307 | head[ident->state] == ch) { | |
1308 | ident->state++; | |
1309 | continue; | |
1310 | } | |
1311 | ||
1312 | if (ident->state) | |
1313 | strbuf_add(&ident->left, head, ident->state); | |
1314 | if (ident->state == sizeof(head) - 1) { | |
1315 | if (ch != ':' && ch != '$') { | |
1316 | strbuf_addch(&ident->left, ch); | |
1317 | ident->state = 0; | |
1318 | continue; | |
1319 | } | |
1320 | ||
1321 | if (ch == ':') { | |
1322 | strbuf_addch(&ident->left, ch); | |
1323 | ident->state = IDENT_SKIPPING; | |
1324 | } else { | |
1325 | strbuf_addstr(&ident->left, ident->ident); | |
1326 | ident->state = IDENT_DRAINING; | |
1327 | } | |
1328 | continue; | |
1329 | } | |
1330 | ||
1331 | strbuf_addch(&ident->left, ch); | |
1332 | ident->state = IDENT_DRAINING; | |
1333 | } | |
1334 | return 0; | |
1335 | } | |
1336 | ||
1337 | static void ident_free_fn(struct stream_filter *filter) | |
1338 | { | |
1339 | struct ident_filter *ident = (struct ident_filter *)filter; | |
1340 | strbuf_release(&ident->left); | |
1341 | free(filter); | |
1342 | } | |
1343 | ||
1344 | static struct stream_filter_vtbl ident_vtbl = { | |
1345 | ident_filter_fn, | |
1346 | ident_free_fn, | |
1347 | }; | |
1348 | ||
1349 | static struct stream_filter *ident_filter(const unsigned char *sha1) | |
1350 | { | |
1351 | struct ident_filter *ident = xmalloc(sizeof(*ident)); | |
1352 | ||
5096d490 JK |
1353 | xsnprintf(ident->ident, sizeof(ident->ident), |
1354 | ": %s $", sha1_to_hex(sha1)); | |
b84c7839 JH |
1355 | strbuf_init(&ident->left, 0); |
1356 | ident->filter.vtbl = &ident_vtbl; | |
1357 | ident->state = 0; | |
1358 | return (struct stream_filter *)ident; | |
1359 | } | |
1360 | ||
dd8e9121 | 1361 | /* |
b6691092 JH |
1362 | * Return an appropriately constructed filter for the path, or NULL if |
1363 | * the contents cannot be filtered without reading the whole thing | |
1364 | * in-core. | |
1365 | * | |
1366 | * Note that you would be crazy to set CRLF, smuge/clean or ident to a | |
1367 | * large binary blob you would want us not to slurp into the memory! | |
dd8e9121 | 1368 | */ |
b6691092 | 1369 | struct stream_filter *get_stream_filter(const char *path, const unsigned char *sha1) |
dd8e9121 JH |
1370 | { |
1371 | struct conv_attrs ca; | |
1372 | enum crlf_action crlf_action; | |
b84c7839 | 1373 | struct stream_filter *filter = NULL; |
dd8e9121 JH |
1374 | |
1375 | convert_attrs(&ca, path); | |
1376 | ||
b84c7839 JH |
1377 | if (ca.drv && (ca.drv->smudge || ca.drv->clean)) |
1378 | return filter; | |
1379 | ||
1380 | if (ca.ident) | |
1381 | filter = ident_filter(sha1); | |
dd8e9121 | 1382 | |
bb211b4d | 1383 | crlf_action = ca.crlf_action; |
b84c7839 | 1384 | |
b0d9c69f | 1385 | if ((crlf_action == CRLF_BINARY) || (crlf_action == CRLF_INPUT) || |
a265a7f9 JH |
1386 | (crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE)) |
1387 | filter = cascade_filter(filter, &null_filter_singleton); | |
1388 | ||
1389 | else if (output_eol(crlf_action) == EOL_CRLF && | |
1390 | !(crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS)) | |
284e3d28 | 1391 | filter = cascade_filter(filter, lf_to_crlf_filter()); |
e322ee38 | 1392 | |
b84c7839 | 1393 | return filter; |
b6691092 JH |
1394 | } |
1395 | ||
1396 | void free_stream_filter(struct stream_filter *filter) | |
1397 | { | |
1398 | filter->vtbl->free(filter); | |
1399 | } | |
1400 | ||
1401 | int stream_filter(struct stream_filter *filter, | |
1402 | const char *input, size_t *isize_p, | |
1403 | char *output, size_t *osize_p) | |
1404 | { | |
1405 | return filter->vtbl->filter(filter, input, isize_p, output, osize_p); | |
dd8e9121 | 1406 | } |