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Commit | Line | Data |
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c1bb9350 LT |
1 | /* |
2 | * apply.c | |
3 | * | |
4 | * Copyright (C) Linus Torvalds, 2005 | |
5 | * | |
6 | * This applies patches on top of some (arbitrary) version of the SCM. | |
7 | * | |
8 | * NOTE! It does all its work in the index file, and only cares about | |
9 | * the files in the working directory if you tell it to "merge" the | |
10 | * patch apply. | |
11 | * | |
12 | * Even when merging it always takes the source from the index, and | |
13 | * uses the working tree as a "branch" for a 3-way merge. | |
14 | */ | |
15 | #include <ctype.h> | |
16 | ||
17 | #include "cache.h" | |
18 | ||
19 | // We default to the merge behaviour, since that's what most people would | |
a577284a LT |
20 | // expect. |
21 | // | |
22 | // --check turns on checking that the working tree matches the | |
23 | // files that are being modified, but doesn't apply the patch | |
24 | // --stat does just a diffstat, and doesn't actually apply | |
25 | // --show-files shows the directory changes | |
26 | // | |
c1bb9350 | 27 | static int merge_patch = 1; |
3cca928d | 28 | static int check_index = 0; |
5aa7d94c | 29 | static int write_index = 0; |
fab2c257 | 30 | static int diffstat = 0; |
a577284a LT |
31 | static int check = 0; |
32 | static int apply = 1; | |
33 | static int show_files = 0; | |
34 | static const char apply_usage[] = "git-apply [--stat] [--check] [--show-files] <patch>"; | |
c1bb9350 | 35 | |
3f40315a LT |
36 | /* |
37 | * For "diff-stat" like behaviour, we keep track of the biggest change | |
38 | * we've seen, and the longest filename. That allows us to do simple | |
39 | * scaling. | |
40 | */ | |
41 | static int max_change, max_len; | |
42 | ||
a4acb0eb LT |
43 | /* |
44 | * Various "current state", notably line numbers and what | |
45 | * file (and how) we're patching right now.. The "is_xxxx" | |
46 | * things are flags, where -1 means "don't know yet". | |
47 | */ | |
46979f56 | 48 | static int linenr = 1; |
19c58fb8 LT |
49 | |
50 | struct fragment { | |
51 | unsigned long oldpos, oldlines; | |
52 | unsigned long newpos, newlines; | |
53 | const char *patch; | |
54 | int size; | |
55 | struct fragment *next; | |
56 | }; | |
57 | ||
58 | struct patch { | |
5041aa70 | 59 | char *new_name, *old_name, *def_name; |
19c58fb8 LT |
60 | unsigned int old_mode, new_mode; |
61 | int is_rename, is_copy, is_new, is_delete; | |
3f40315a | 62 | int lines_added, lines_deleted; |
19c58fb8 | 63 | struct fragment *fragments; |
5aa7d94c | 64 | char *result; |
3cca928d | 65 | unsigned long resultsize; |
19c58fb8 LT |
66 | struct patch *next; |
67 | }; | |
46979f56 | 68 | |
c1bb9350 | 69 | #define CHUNKSIZE (8192) |
a4acb0eb | 70 | #define SLOP (16) |
c1bb9350 LT |
71 | |
72 | static void *read_patch_file(int fd, unsigned long *sizep) | |
73 | { | |
74 | unsigned long size = 0, alloc = CHUNKSIZE; | |
75 | void *buffer = xmalloc(alloc); | |
76 | ||
77 | for (;;) { | |
78 | int nr = alloc - size; | |
79 | if (nr < 1024) { | |
80 | alloc += CHUNKSIZE; | |
81 | buffer = xrealloc(buffer, alloc); | |
82 | nr = alloc - size; | |
83 | } | |
84 | nr = read(fd, buffer + size, nr); | |
85 | if (!nr) | |
86 | break; | |
87 | if (nr < 0) { | |
88 | if (errno == EAGAIN) | |
89 | continue; | |
90 | die("git-apply: read returned %s", strerror(errno)); | |
91 | } | |
92 | size += nr; | |
93 | } | |
94 | *sizep = size; | |
a4acb0eb LT |
95 | |
96 | /* | |
97 | * Make sure that we have some slop in the buffer | |
98 | * so that we can do speculative "memcmp" etc, and | |
99 | * see to it that it is NUL-filled. | |
100 | */ | |
101 | if (alloc < size + SLOP) | |
102 | buffer = xrealloc(buffer, size + SLOP); | |
103 | memset(buffer + size, 0, SLOP); | |
c1bb9350 LT |
104 | return buffer; |
105 | } | |
106 | ||
3cca928d | 107 | static unsigned long linelen(const char *buffer, unsigned long size) |
c1bb9350 LT |
108 | { |
109 | unsigned long len = 0; | |
110 | while (size--) { | |
111 | len++; | |
112 | if (*buffer++ == '\n') | |
113 | break; | |
114 | } | |
115 | return len; | |
116 | } | |
117 | ||
a4acb0eb LT |
118 | static int is_dev_null(const char *str) |
119 | { | |
120 | return !memcmp("/dev/null", str, 9) && isspace(str[9]); | |
121 | } | |
122 | ||
381ca9a3 LT |
123 | #define TERM_SPACE 1 |
124 | #define TERM_TAB 2 | |
9a4a100e LT |
125 | |
126 | static int name_terminate(const char *name, int namelen, int c, int terminate) | |
127 | { | |
128 | if (c == ' ' && !(terminate & TERM_SPACE)) | |
129 | return 0; | |
130 | if (c == '\t' && !(terminate & TERM_TAB)) | |
131 | return 0; | |
132 | ||
9a4a100e LT |
133 | return 1; |
134 | } | |
135 | ||
136 | static char * find_name(const char *line, char *def, int p_value, int terminate) | |
c1bb9350 | 137 | { |
a4acb0eb LT |
138 | int len; |
139 | const char *start = line; | |
140 | char *name; | |
141 | ||
c1bb9350 | 142 | for (;;) { |
a4acb0eb | 143 | char c = *line; |
9a4a100e LT |
144 | |
145 | if (isspace(c)) { | |
146 | if (c == '\n') | |
147 | break; | |
148 | if (name_terminate(start, line-start, c, terminate)) | |
149 | break; | |
150 | } | |
a4acb0eb LT |
151 | line++; |
152 | if (c == '/' && !--p_value) | |
153 | start = line; | |
154 | } | |
155 | if (!start) | |
156 | return def; | |
157 | len = line - start; | |
158 | if (!len) | |
159 | return def; | |
160 | ||
161 | /* | |
162 | * Generally we prefer the shorter name, especially | |
163 | * if the other one is just a variation of that with | |
164 | * something else tacked on to the end (ie "file.orig" | |
165 | * or "file~"). | |
166 | */ | |
167 | if (def) { | |
168 | int deflen = strlen(def); | |
169 | if (deflen < len && !strncmp(start, def, deflen)) | |
170 | return def; | |
c1bb9350 | 171 | } |
a4acb0eb LT |
172 | |
173 | name = xmalloc(len + 1); | |
174 | memcpy(name, start, len); | |
175 | name[len] = 0; | |
176 | free(def); | |
177 | return name; | |
178 | } | |
179 | ||
180 | /* | |
181 | * Get the name etc info from the --/+++ lines of a traditional patch header | |
182 | * | |
183 | * NOTE! This hardcodes "-p1" behaviour in filename detection. | |
9a4a100e LT |
184 | * |
185 | * FIXME! The end-of-filename heuristics are kind of screwy. For existing | |
186 | * files, we can happily check the index for a match, but for creating a | |
187 | * new file we should try to match whatever "patch" does. I have no idea. | |
a4acb0eb | 188 | */ |
19c58fb8 | 189 | static void parse_traditional_patch(const char *first, const char *second, struct patch *patch) |
a4acb0eb LT |
190 | { |
191 | int p_value = 1; | |
192 | char *name; | |
193 | ||
194 | first += 4; // skip "--- " | |
195 | second += 4; // skip "+++ " | |
196 | if (is_dev_null(first)) { | |
19c58fb8 LT |
197 | patch->is_new = 1; |
198 | patch->is_delete = 0; | |
5041aa70 | 199 | name = find_name(second, NULL, p_value, TERM_SPACE | TERM_TAB); |
19c58fb8 | 200 | patch->new_name = name; |
a4acb0eb | 201 | } else if (is_dev_null(second)) { |
19c58fb8 LT |
202 | patch->is_new = 0; |
203 | patch->is_delete = 1; | |
381ca9a3 | 204 | name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB); |
19c58fb8 | 205 | patch->old_name = name; |
a4acb0eb | 206 | } else { |
381ca9a3 LT |
207 | name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB); |
208 | name = find_name(second, name, p_value, TERM_SPACE | TERM_TAB); | |
19c58fb8 | 209 | patch->old_name = patch->new_name = name; |
a4acb0eb LT |
210 | } |
211 | if (!name) | |
212 | die("unable to find filename in patch at line %d", linenr); | |
a4acb0eb LT |
213 | } |
214 | ||
19c58fb8 | 215 | static int gitdiff_hdrend(const char *line, struct patch *patch) |
a4acb0eb LT |
216 | { |
217 | return -1; | |
218 | } | |
219 | ||
1e3f6b6e LT |
220 | /* |
221 | * We're anal about diff header consistency, to make | |
222 | * sure that we don't end up having strange ambiguous | |
223 | * patches floating around. | |
224 | * | |
225 | * As a result, gitdiff_{old|new}name() will check | |
226 | * their names against any previous information, just | |
227 | * to make sure.. | |
228 | */ | |
229 | static char *gitdiff_verify_name(const char *line, int isnull, char *orig_name, const char *oldnew) | |
230 | { | |
231 | int len; | |
232 | const char *name; | |
233 | ||
234 | if (!orig_name && !isnull) | |
235 | return find_name(line, NULL, 1, 0); | |
236 | ||
237 | name = "/dev/null"; | |
238 | len = 9; | |
239 | if (orig_name) { | |
240 | name = orig_name; | |
241 | len = strlen(name); | |
242 | if (isnull) | |
243 | die("git-apply: bad git-diff - expected /dev/null, got %s on line %d", name, linenr); | |
244 | } | |
245 | ||
246 | if (*name == '/') | |
247 | goto absolute_path; | |
248 | ||
249 | for (;;) { | |
250 | char c = *line++; | |
251 | if (c == '\n') | |
252 | break; | |
253 | if (c != '/') | |
254 | continue; | |
255 | absolute_path: | |
256 | if (memcmp(line, name, len) || line[len] != '\n') | |
257 | break; | |
258 | return orig_name; | |
259 | } | |
260 | die("git-apply: bad git-diff - inconsistent %s filename on line %d", oldnew, linenr); | |
261 | return NULL; | |
262 | } | |
263 | ||
19c58fb8 | 264 | static int gitdiff_oldname(const char *line, struct patch *patch) |
a4acb0eb | 265 | { |
19c58fb8 | 266 | patch->old_name = gitdiff_verify_name(line, patch->is_new, patch->old_name, "old"); |
a4acb0eb LT |
267 | return 0; |
268 | } | |
269 | ||
19c58fb8 | 270 | static int gitdiff_newname(const char *line, struct patch *patch) |
a4acb0eb | 271 | { |
19c58fb8 | 272 | patch->new_name = gitdiff_verify_name(line, patch->is_delete, patch->new_name, "new"); |
a4acb0eb LT |
273 | return 0; |
274 | } | |
275 | ||
19c58fb8 | 276 | static int gitdiff_oldmode(const char *line, struct patch *patch) |
a4acb0eb | 277 | { |
19c58fb8 | 278 | patch->old_mode = strtoul(line, NULL, 8); |
a4acb0eb LT |
279 | return 0; |
280 | } | |
281 | ||
19c58fb8 | 282 | static int gitdiff_newmode(const char *line, struct patch *patch) |
a4acb0eb | 283 | { |
19c58fb8 | 284 | patch->new_mode = strtoul(line, NULL, 8); |
a4acb0eb LT |
285 | return 0; |
286 | } | |
287 | ||
19c58fb8 | 288 | static int gitdiff_delete(const char *line, struct patch *patch) |
a4acb0eb | 289 | { |
19c58fb8 | 290 | patch->is_delete = 1; |
5041aa70 | 291 | patch->old_name = patch->def_name; |
19c58fb8 | 292 | return gitdiff_oldmode(line, patch); |
a4acb0eb LT |
293 | } |
294 | ||
19c58fb8 | 295 | static int gitdiff_newfile(const char *line, struct patch *patch) |
a4acb0eb | 296 | { |
19c58fb8 | 297 | patch->is_new = 1; |
5041aa70 | 298 | patch->new_name = patch->def_name; |
19c58fb8 | 299 | return gitdiff_newmode(line, patch); |
a4acb0eb LT |
300 | } |
301 | ||
19c58fb8 | 302 | static int gitdiff_copysrc(const char *line, struct patch *patch) |
a4acb0eb | 303 | { |
19c58fb8 LT |
304 | patch->is_copy = 1; |
305 | patch->old_name = find_name(line, NULL, 0, 0); | |
a4acb0eb LT |
306 | return 0; |
307 | } | |
308 | ||
19c58fb8 | 309 | static int gitdiff_copydst(const char *line, struct patch *patch) |
a4acb0eb | 310 | { |
19c58fb8 LT |
311 | patch->is_copy = 1; |
312 | patch->new_name = find_name(line, NULL, 0, 0); | |
a4acb0eb LT |
313 | return 0; |
314 | } | |
315 | ||
19c58fb8 | 316 | static int gitdiff_renamesrc(const char *line, struct patch *patch) |
a4acb0eb | 317 | { |
19c58fb8 LT |
318 | patch->is_rename = 1; |
319 | patch->old_name = find_name(line, NULL, 0, 0); | |
a4acb0eb LT |
320 | return 0; |
321 | } | |
322 | ||
19c58fb8 | 323 | static int gitdiff_renamedst(const char *line, struct patch *patch) |
a4acb0eb | 324 | { |
19c58fb8 LT |
325 | patch->is_rename = 1; |
326 | patch->new_name = find_name(line, NULL, 0, 0); | |
a4acb0eb LT |
327 | return 0; |
328 | } | |
329 | ||
19c58fb8 | 330 | static int gitdiff_similarity(const char *line, struct patch *patch) |
a4acb0eb LT |
331 | { |
332 | return 0; | |
c1bb9350 LT |
333 | } |
334 | ||
70aadac0 JH |
335 | static int gitdiff_dissimilarity(const char *line, struct patch *patch) |
336 | { | |
337 | return 0; | |
338 | } | |
339 | ||
9a4a100e LT |
340 | /* |
341 | * This is normal for a diff that doesn't change anything: we'll fall through | |
342 | * into the next diff. Tell the parser to break out. | |
343 | */ | |
19c58fb8 | 344 | static int gitdiff_unrecognized(const char *line, struct patch *patch) |
9a4a100e LT |
345 | { |
346 | return -1; | |
347 | } | |
348 | ||
5041aa70 LT |
349 | static char *git_header_name(char *line) |
350 | { | |
351 | int len; | |
352 | char *name, *second; | |
353 | ||
354 | /* | |
355 | * Find the first '/' | |
356 | */ | |
357 | name = line; | |
358 | for (;;) { | |
359 | char c = *name++; | |
360 | if (c == '\n') | |
361 | return NULL; | |
362 | if (c == '/') | |
363 | break; | |
364 | } | |
365 | ||
366 | /* | |
367 | * We don't accept absolute paths (/dev/null) as possibly valid | |
368 | */ | |
369 | if (name == line+1) | |
370 | return NULL; | |
371 | ||
372 | /* | |
373 | * Accept a name only if it shows up twice, exactly the same | |
374 | * form. | |
375 | */ | |
376 | for (len = 0 ; ; len++) { | |
377 | char c = name[len]; | |
378 | ||
379 | switch (c) { | |
380 | default: | |
381 | continue; | |
382 | case '\n': | |
383 | break; | |
384 | case '\t': case ' ': | |
385 | second = name+len; | |
386 | for (;;) { | |
387 | char c = *second++; | |
388 | if (c == '\n') | |
389 | return NULL; | |
390 | if (c == '/') | |
391 | break; | |
392 | } | |
0e87e048 | 393 | if (second[len] == '\n' && !memcmp(name, second, len)) { |
5041aa70 LT |
394 | char *ret = xmalloc(len + 1); |
395 | memcpy(ret, name, len); | |
396 | ret[len] = 0; | |
397 | return ret; | |
398 | } | |
399 | } | |
400 | } | |
401 | return NULL; | |
402 | } | |
403 | ||
c1bb9350 | 404 | /* Verify that we recognize the lines following a git header */ |
19c58fb8 | 405 | static int parse_git_header(char *line, int len, unsigned int size, struct patch *patch) |
c1bb9350 | 406 | { |
a4acb0eb LT |
407 | unsigned long offset; |
408 | ||
409 | /* A git diff has explicit new/delete information, so we don't guess */ | |
19c58fb8 LT |
410 | patch->is_new = 0; |
411 | patch->is_delete = 0; | |
a4acb0eb | 412 | |
5041aa70 LT |
413 | /* |
414 | * Some things may not have the old name in the | |
415 | * rest of the headers anywhere (pure mode changes, | |
416 | * or removing or adding empty files), so we get | |
417 | * the default name from the header. | |
418 | */ | |
419 | patch->def_name = git_header_name(line + strlen("diff --git ")); | |
420 | ||
a4acb0eb LT |
421 | line += len; |
422 | size -= len; | |
423 | linenr++; | |
424 | for (offset = len ; size > 0 ; offset += len, size -= len, line += len, linenr++) { | |
425 | static const struct opentry { | |
426 | const char *str; | |
19c58fb8 | 427 | int (*fn)(const char *, struct patch *); |
a4acb0eb LT |
428 | } optable[] = { |
429 | { "@@ -", gitdiff_hdrend }, | |
430 | { "--- ", gitdiff_oldname }, | |
431 | { "+++ ", gitdiff_newname }, | |
432 | { "old mode ", gitdiff_oldmode }, | |
433 | { "new mode ", gitdiff_newmode }, | |
434 | { "deleted file mode ", gitdiff_delete }, | |
435 | { "new file mode ", gitdiff_newfile }, | |
436 | { "copy from ", gitdiff_copysrc }, | |
437 | { "copy to ", gitdiff_copydst }, | |
33f4d087 LT |
438 | { "rename old ", gitdiff_renamesrc }, |
439 | { "rename new ", gitdiff_renamedst }, | |
a4acb0eb | 440 | { "similarity index ", gitdiff_similarity }, |
70aadac0 | 441 | { "dissimilarity index ", gitdiff_dissimilarity }, |
9a4a100e | 442 | { "", gitdiff_unrecognized }, |
a4acb0eb LT |
443 | }; |
444 | int i; | |
c1bb9350 | 445 | |
c1bb9350 | 446 | len = linelen(line, size); |
a4acb0eb | 447 | if (!len || line[len-1] != '\n') |
c1bb9350 | 448 | break; |
a4acb0eb LT |
449 | for (i = 0; i < sizeof(optable) / sizeof(optable[0]); i++) { |
450 | const struct opentry *p = optable + i; | |
451 | int oplen = strlen(p->str); | |
452 | if (len < oplen || memcmp(p->str, line, oplen)) | |
453 | continue; | |
19c58fb8 | 454 | if (p->fn(line + oplen, patch) < 0) |
a4acb0eb | 455 | return offset; |
9a4a100e | 456 | break; |
a4acb0eb | 457 | } |
c1bb9350 LT |
458 | } |
459 | ||
a4acb0eb | 460 | return offset; |
c1bb9350 LT |
461 | } |
462 | ||
fab2c257 | 463 | static int parse_num(const char *line, unsigned long *p) |
46979f56 LT |
464 | { |
465 | char *ptr; | |
fab2c257 LT |
466 | |
467 | if (!isdigit(*line)) | |
468 | return 0; | |
469 | *p = strtoul(line, &ptr, 10); | |
470 | return ptr - line; | |
471 | } | |
472 | ||
473 | static int parse_range(const char *line, int len, int offset, const char *expect, | |
474 | unsigned long *p1, unsigned long *p2) | |
475 | { | |
46979f56 LT |
476 | int digits, ex; |
477 | ||
478 | if (offset < 0 || offset >= len) | |
479 | return -1; | |
480 | line += offset; | |
481 | len -= offset; | |
482 | ||
fab2c257 LT |
483 | digits = parse_num(line, p1); |
484 | if (!digits) | |
46979f56 | 485 | return -1; |
46979f56 LT |
486 | |
487 | offset += digits; | |
488 | line += digits; | |
489 | len -= digits; | |
490 | ||
fab2c257 LT |
491 | *p2 = *p1; |
492 | if (*line == ',') { | |
493 | digits = parse_num(line+1, p2); | |
494 | if (!digits) | |
495 | return -1; | |
496 | ||
497 | offset += digits+1; | |
498 | line += digits+1; | |
499 | len -= digits+1; | |
500 | } | |
501 | ||
46979f56 LT |
502 | ex = strlen(expect); |
503 | if (ex > len) | |
504 | return -1; | |
505 | if (memcmp(line, expect, ex)) | |
506 | return -1; | |
507 | ||
508 | return offset + ex; | |
509 | } | |
510 | ||
511 | /* | |
512 | * Parse a unified diff fragment header of the | |
513 | * form "@@ -a,b +c,d @@" | |
514 | */ | |
19c58fb8 | 515 | static int parse_fragment_header(char *line, int len, struct fragment *fragment) |
46979f56 LT |
516 | { |
517 | int offset; | |
518 | ||
519 | if (!len || line[len-1] != '\n') | |
520 | return -1; | |
521 | ||
522 | /* Figure out the number of lines in a fragment */ | |
fab2c257 LT |
523 | offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines); |
524 | offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines); | |
46979f56 LT |
525 | |
526 | return offset; | |
527 | } | |
528 | ||
19c58fb8 | 529 | static int find_header(char *line, unsigned long size, int *hdrsize, struct patch *patch) |
c1bb9350 LT |
530 | { |
531 | unsigned long offset, len; | |
532 | ||
19c58fb8 LT |
533 | patch->is_rename = patch->is_copy = 0; |
534 | patch->is_new = patch->is_delete = -1; | |
535 | patch->old_mode = patch->new_mode = 0; | |
536 | patch->old_name = patch->new_name = NULL; | |
46979f56 | 537 | for (offset = 0; size > 0; offset += len, size -= len, line += len, linenr++) { |
c1bb9350 LT |
538 | unsigned long nextlen; |
539 | ||
540 | len = linelen(line, size); | |
541 | if (!len) | |
542 | break; | |
543 | ||
544 | /* Testing this early allows us to take a few shortcuts.. */ | |
545 | if (len < 6) | |
546 | continue; | |
46979f56 LT |
547 | |
548 | /* | |
549 | * Make sure we don't find any unconnected patch fragmants. | |
550 | * That's a sign that we didn't find a header, and that a | |
551 | * patch has become corrupted/broken up. | |
552 | */ | |
553 | if (!memcmp("@@ -", line, 4)) { | |
19c58fb8 LT |
554 | struct fragment dummy; |
555 | if (parse_fragment_header(line, len, &dummy) < 0) | |
46979f56 LT |
556 | continue; |
557 | error("patch fragment without header at line %d: %.*s", linenr, len-1, line); | |
558 | } | |
559 | ||
c1bb9350 LT |
560 | if (size < len + 6) |
561 | break; | |
562 | ||
563 | /* | |
564 | * Git patch? It might not have a real patch, just a rename | |
565 | * or mode change, so we handle that specially | |
566 | */ | |
567 | if (!memcmp("diff --git ", line, 11)) { | |
19c58fb8 | 568 | int git_hdr_len = parse_git_header(line, len, size, patch); |
c1bb9350 LT |
569 | if (git_hdr_len < 0) |
570 | continue; | |
5041aa70 | 571 | if (!patch->old_name && !patch->new_name) |
33f4d087 | 572 | die("git diff header lacks filename information (line %d)", linenr); |
a4acb0eb | 573 | *hdrsize = git_hdr_len; |
c1bb9350 LT |
574 | return offset; |
575 | } | |
576 | ||
577 | /** --- followed by +++ ? */ | |
578 | if (memcmp("--- ", line, 4) || memcmp("+++ ", line + len, 4)) | |
579 | continue; | |
580 | ||
581 | /* | |
582 | * We only accept unified patches, so we want it to | |
583 | * at least have "@@ -a,b +c,d @@\n", which is 14 chars | |
584 | * minimum | |
585 | */ | |
586 | nextlen = linelen(line + len, size - len); | |
587 | if (size < nextlen + 14 || memcmp("@@ -", line + len + nextlen, 4)) | |
588 | continue; | |
589 | ||
590 | /* Ok, we'll consider it a patch */ | |
19c58fb8 | 591 | parse_traditional_patch(line, line+len, patch); |
c1bb9350 | 592 | *hdrsize = len + nextlen; |
46979f56 | 593 | linenr += 2; |
c1bb9350 LT |
594 | return offset; |
595 | } | |
596 | return -1; | |
597 | } | |
598 | ||
c1bb9350 LT |
599 | /* |
600 | * Parse a unified diff. Note that this really needs | |
601 | * to parse each fragment separately, since the only | |
602 | * way to know the difference between a "---" that is | |
603 | * part of a patch, and a "---" that starts the next | |
604 | * patch is to look at the line counts.. | |
605 | */ | |
19c58fb8 | 606 | static int parse_fragment(char *line, unsigned long size, struct patch *patch, struct fragment *fragment) |
c1bb9350 | 607 | { |
3f40315a | 608 | int added, deleted; |
c1bb9350 | 609 | int len = linelen(line, size), offset; |
30996652 | 610 | unsigned long oldlines, newlines; |
c1bb9350 | 611 | |
19c58fb8 | 612 | offset = parse_fragment_header(line, len, fragment); |
c1bb9350 LT |
613 | if (offset < 0) |
614 | return -1; | |
19c58fb8 LT |
615 | oldlines = fragment->oldlines; |
616 | newlines = fragment->newlines; | |
c1bb9350 | 617 | |
30996652 LT |
618 | if (patch->is_new < 0) { |
619 | patch->is_new = !oldlines; | |
620 | if (!oldlines) | |
621 | patch->old_name = NULL; | |
622 | } | |
623 | if (patch->is_delete < 0) { | |
624 | patch->is_delete = !newlines; | |
625 | if (!newlines) | |
626 | patch->new_name = NULL; | |
627 | } | |
628 | ||
629 | if (patch->is_new != !oldlines) | |
630 | return error("new file depends on old contents"); | |
631 | if (patch->is_delete != !newlines) | |
632 | return error("deleted file still has contents"); | |
a4acb0eb | 633 | |
c1bb9350 LT |
634 | /* Parse the thing.. */ |
635 | line += len; | |
636 | size -= len; | |
46979f56 | 637 | linenr++; |
3f40315a | 638 | added = deleted = 0; |
46979f56 | 639 | for (offset = len; size > 0; offset += len, size -= len, line += len, linenr++) { |
c1bb9350 LT |
640 | if (!oldlines && !newlines) |
641 | break; | |
642 | len = linelen(line, size); | |
643 | if (!len || line[len-1] != '\n') | |
644 | return -1; | |
645 | switch (*line) { | |
646 | default: | |
647 | return -1; | |
648 | case ' ': | |
649 | oldlines--; | |
650 | newlines--; | |
651 | break; | |
652 | case '-': | |
3f40315a | 653 | deleted++; |
c1bb9350 LT |
654 | oldlines--; |
655 | break; | |
656 | case '+': | |
3f40315a | 657 | added++; |
c1bb9350 LT |
658 | newlines--; |
659 | break; | |
fab2c257 LT |
660 | /* We allow "\ No newline at end of file" */ |
661 | case '\\': | |
3cca928d LT |
662 | if (len < 12 || memcmp(line, "\\ No newline", 12)) |
663 | return -1; | |
fab2c257 | 664 | break; |
c1bb9350 LT |
665 | } |
666 | } | |
3f40315a LT |
667 | patch->lines_added += added; |
668 | patch->lines_deleted += deleted; | |
c1bb9350 LT |
669 | return offset; |
670 | } | |
671 | ||
19c58fb8 | 672 | static int parse_single_patch(char *line, unsigned long size, struct patch *patch) |
c1bb9350 LT |
673 | { |
674 | unsigned long offset = 0; | |
19c58fb8 | 675 | struct fragment **fragp = &patch->fragments; |
c1bb9350 LT |
676 | |
677 | while (size > 4 && !memcmp(line, "@@ -", 4)) { | |
19c58fb8 LT |
678 | struct fragment *fragment; |
679 | int len; | |
680 | ||
681 | fragment = xmalloc(sizeof(*fragment)); | |
682 | memset(fragment, 0, sizeof(*fragment)); | |
683 | len = parse_fragment(line, size, patch, fragment); | |
c1bb9350 | 684 | if (len <= 0) |
46979f56 | 685 | die("corrupt patch at line %d", linenr); |
c1bb9350 | 686 | |
19c58fb8 LT |
687 | fragment->patch = line; |
688 | fragment->size = len; | |
689 | ||
690 | *fragp = fragment; | |
691 | fragp = &fragment->next; | |
c1bb9350 LT |
692 | |
693 | offset += len; | |
694 | line += len; | |
695 | size -= len; | |
696 | } | |
697 | return offset; | |
698 | } | |
699 | ||
19c58fb8 | 700 | static int parse_chunk(char *buffer, unsigned long size, struct patch *patch) |
c1bb9350 LT |
701 | { |
702 | int hdrsize, patchsize; | |
19c58fb8 | 703 | int offset = find_header(buffer, size, &hdrsize, patch); |
c1bb9350 LT |
704 | |
705 | if (offset < 0) | |
706 | return offset; | |
c1bb9350 | 707 | |
19c58fb8 | 708 | patchsize = parse_single_patch(buffer + offset + hdrsize, size - offset - hdrsize, patch); |
c1bb9350 LT |
709 | |
710 | return offset + hdrsize + patchsize; | |
711 | } | |
712 | ||
3f40315a LT |
713 | const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"; |
714 | const char minuses[]= "----------------------------------------------------------------------"; | |
715 | ||
716 | static void show_stats(struct patch *patch) | |
717 | { | |
718 | char *name = patch->old_name; | |
95bedc9e | 719 | int len, max, add, del, total; |
3f40315a | 720 | |
5041aa70 | 721 | if (!name) |
3f40315a LT |
722 | name = patch->new_name; |
723 | ||
724 | /* | |
725 | * "scale" the filename | |
726 | */ | |
727 | len = strlen(name); | |
728 | max = max_len; | |
729 | if (max > 50) | |
730 | max = 50; | |
731 | if (len > max) | |
732 | name += len - max; | |
733 | len = max; | |
734 | ||
735 | /* | |
736 | * scale the add/delete | |
737 | */ | |
738 | max = max_change; | |
739 | if (max + len > 70) | |
740 | max = 70 - len; | |
95bedc9e LT |
741 | |
742 | add = patch->lines_added; | |
743 | del = patch->lines_deleted; | |
744 | total = add + del; | |
745 | ||
746 | total = (total * max + max_change / 2) / max_change; | |
747 | add = (add * max + max_change / 2) / max_change; | |
748 | del = total - add; | |
3f40315a LT |
749 | printf(" %-*s |%5d %.*s%.*s\n", |
750 | len, name, patch->lines_added + patch->lines_deleted, | |
751 | add, pluses, del, minuses); | |
752 | } | |
753 | ||
3cca928d LT |
754 | static int read_old_data(struct stat *st, const char *path, void *buf, unsigned long size) |
755 | { | |
756 | int fd; | |
757 | unsigned long got; | |
758 | ||
759 | switch (st->st_mode & S_IFMT) { | |
760 | case S_IFLNK: | |
761 | return readlink(path, buf, size); | |
762 | case S_IFREG: | |
763 | fd = open(path, O_RDONLY); | |
764 | if (fd < 0) | |
765 | return error("unable to open %s", path); | |
766 | got = 0; | |
767 | for (;;) { | |
768 | int ret = read(fd, buf + got, size - got); | |
769 | if (ret < 0) { | |
770 | if (errno == EAGAIN) | |
771 | continue; | |
772 | break; | |
773 | } | |
774 | if (!ret) | |
775 | break; | |
776 | got += ret; | |
777 | } | |
778 | close(fd); | |
779 | return got; | |
780 | ||
781 | default: | |
782 | return -1; | |
783 | } | |
784 | } | |
785 | ||
786 | static int find_offset(const char *buf, unsigned long size, const char *fragment, unsigned long fragsize, int line) | |
787 | { | |
6e7c92a9 LT |
788 | int i; |
789 | unsigned long start, backwards, forwards; | |
3cca928d LT |
790 | |
791 | if (fragsize > size) | |
792 | return -1; | |
793 | ||
794 | start = 0; | |
795 | if (line > 1) { | |
3cca928d | 796 | unsigned long offset = 0; |
6e7c92a9 LT |
797 | i = line-1; |
798 | while (offset + fragsize <= size) { | |
3cca928d LT |
799 | if (buf[offset++] == '\n') { |
800 | start = offset; | |
6e7c92a9 | 801 | if (!--i) |
3cca928d LT |
802 | break; |
803 | } | |
804 | } | |
805 | } | |
806 | ||
807 | /* Exact line number? */ | |
808 | if (!memcmp(buf + start, fragment, fragsize)) | |
809 | return start; | |
810 | ||
6e7c92a9 LT |
811 | /* |
812 | * There's probably some smart way to do this, but I'll leave | |
813 | * that to the smart and beautiful people. I'm simple and stupid. | |
814 | */ | |
815 | backwards = start; | |
816 | forwards = start; | |
817 | for (i = 0; ; i++) { | |
818 | unsigned long try; | |
819 | int n; | |
820 | ||
821 | /* "backward" */ | |
822 | if (i & 1) { | |
823 | if (!backwards) { | |
824 | if (forwards + fragsize > size) | |
825 | break; | |
826 | continue; | |
827 | } | |
828 | do { | |
829 | --backwards; | |
830 | } while (backwards && buf[backwards-1] != '\n'); | |
831 | try = backwards; | |
832 | } else { | |
833 | while (forwards + fragsize <= size) { | |
834 | if (buf[forwards++] == '\n') | |
835 | break; | |
836 | } | |
837 | try = forwards; | |
838 | } | |
839 | ||
840 | if (try + fragsize > size) | |
841 | continue; | |
842 | if (memcmp(buf + try, fragment, fragsize)) | |
843 | continue; | |
844 | n = (i >> 1)+1; | |
845 | if (i & 1) | |
846 | n = -n; | |
847 | fprintf(stderr, "Fragment applied at offset %d\n", n); | |
848 | return try; | |
849 | } | |
850 | ||
3cca928d LT |
851 | /* |
852 | * We should start searching forward and backward. | |
853 | */ | |
854 | return -1; | |
855 | } | |
856 | ||
6e7c92a9 LT |
857 | struct buffer_desc { |
858 | char *buffer; | |
859 | unsigned long size; | |
860 | unsigned long alloc; | |
861 | }; | |
862 | ||
863 | static int apply_one_fragment(struct buffer_desc *desc, struct fragment *frag) | |
3cca928d | 864 | { |
6e7c92a9 | 865 | char *buf = desc->buffer; |
3cca928d LT |
866 | const char *patch = frag->patch; |
867 | int offset, size = frag->size; | |
868 | char *old = xmalloc(size); | |
869 | char *new = xmalloc(size); | |
870 | int oldsize = 0, newsize = 0; | |
871 | ||
872 | while (size > 0) { | |
873 | int len = linelen(patch, size); | |
874 | int plen; | |
875 | ||
876 | if (!len) | |
877 | break; | |
878 | ||
879 | /* | |
880 | * "plen" is how much of the line we should use for | |
881 | * the actual patch data. Normally we just remove the | |
882 | * first character on the line, but if the line is | |
883 | * followed by "\ No newline", then we also remove the | |
884 | * last one (which is the newline, of course). | |
885 | */ | |
886 | plen = len-1; | |
887 | if (len > size && patch[len] == '\\') | |
888 | plen--; | |
889 | switch (*patch) { | |
890 | case ' ': | |
891 | case '-': | |
892 | memcpy(old + oldsize, patch + 1, plen); | |
893 | oldsize += plen; | |
894 | if (*patch == '-') | |
895 | break; | |
896 | /* Fall-through for ' ' */ | |
897 | case '+': | |
898 | memcpy(new + newsize, patch + 1, plen); | |
899 | newsize += plen; | |
900 | break; | |
901 | case '@': case '\\': | |
902 | /* Ignore it, we already handled it */ | |
903 | break; | |
904 | default: | |
905 | return -1; | |
906 | } | |
907 | patch += len; | |
908 | size -= len; | |
909 | } | |
910 | ||
6e7c92a9 | 911 | offset = find_offset(buf, desc->size, old, oldsize, frag->newpos); |
3cca928d | 912 | if (offset >= 0) { |
6e7c92a9 LT |
913 | int diff = newsize - oldsize; |
914 | unsigned long size = desc->size + diff; | |
915 | unsigned long alloc = desc->alloc; | |
916 | ||
917 | if (size > alloc) { | |
918 | alloc = size + 8192; | |
919 | desc->alloc = alloc; | |
920 | buf = xrealloc(buf, alloc); | |
921 | desc->buffer = buf; | |
922 | } | |
923 | desc->size = size; | |
924 | memmove(buf + offset + newsize, buf + offset + oldsize, size - offset - newsize); | |
925 | memcpy(buf + offset, new, newsize); | |
3cca928d LT |
926 | offset = 0; |
927 | } | |
928 | ||
929 | free(old); | |
930 | free(new); | |
931 | return offset; | |
932 | } | |
933 | ||
6e7c92a9 | 934 | static int apply_fragments(struct buffer_desc *desc, struct patch *patch) |
3cca928d LT |
935 | { |
936 | struct fragment *frag = patch->fragments; | |
937 | ||
938 | while (frag) { | |
6e7c92a9 | 939 | if (apply_one_fragment(desc, frag) < 0) |
3cca928d LT |
940 | return error("patch failed: %s:%d", patch->old_name, frag->oldpos); |
941 | frag = frag->next; | |
942 | } | |
30996652 | 943 | return 0; |
3cca928d LT |
944 | } |
945 | ||
946 | static int apply_data(struct patch *patch, struct stat *st) | |
947 | { | |
6e7c92a9 LT |
948 | char *buf; |
949 | unsigned long size, alloc; | |
950 | struct buffer_desc desc; | |
3cca928d | 951 | |
30996652 LT |
952 | size = 0; |
953 | alloc = 0; | |
954 | buf = NULL; | |
955 | if (patch->old_name) { | |
956 | size = st->st_size; | |
957 | alloc = size + 8192; | |
958 | buf = xmalloc(alloc); | |
959 | if (read_old_data(st, patch->old_name, buf, alloc) != size) | |
960 | return error("read of %s failed", patch->old_name); | |
961 | } | |
6e7c92a9 LT |
962 | |
963 | desc.size = size; | |
964 | desc.alloc = alloc; | |
965 | desc.buffer = buf; | |
966 | if (apply_fragments(&desc, patch) < 0) | |
3cca928d | 967 | return -1; |
6e7c92a9 LT |
968 | patch->result = desc.buffer; |
969 | patch->resultsize = desc.size; | |
5aa7d94c LT |
970 | |
971 | if (patch->is_delete && patch->resultsize) | |
972 | return error("removal patch leaves file contents"); | |
973 | ||
3cca928d LT |
974 | return 0; |
975 | } | |
976 | ||
a577284a | 977 | static int check_patch(struct patch *patch) |
fab2c257 | 978 | { |
a577284a | 979 | struct stat st; |
fab2c257 LT |
980 | const char *old_name = patch->old_name; |
981 | const char *new_name = patch->new_name; | |
982 | ||
983 | if (old_name) { | |
a577284a LT |
984 | int changed; |
985 | ||
a577284a LT |
986 | if (lstat(old_name, &st) < 0) |
987 | return error("%s: %s\n", strerror(errno)); | |
3cca928d LT |
988 | if (check_index) { |
989 | int pos = cache_name_pos(old_name, strlen(old_name)); | |
990 | if (pos < 0) | |
991 | return error("%s: does not exist in index", old_name); | |
992 | changed = ce_match_stat(active_cache[pos], &st); | |
993 | if (changed) | |
994 | return error("%s: does not match index", old_name); | |
995 | } | |
996 | if (patch->is_new < 0) | |
997 | patch->is_new = 0; | |
a577284a LT |
998 | if (!patch->old_mode) |
999 | patch->old_mode = st.st_mode; | |
3cca928d LT |
1000 | if ((st.st_mode ^ patch->old_mode) & S_IFMT) |
1001 | return error("%s: wrong type", old_name); | |
1002 | if (st.st_mode != patch->old_mode) | |
1003 | fprintf(stderr, "warning: %s has type %o, expected %o\n", | |
1004 | old_name, st.st_mode, patch->old_mode); | |
fab2c257 | 1005 | } |
a577284a | 1006 | |
fab2c257 | 1007 | if (new_name && (patch->is_new | patch->is_rename | patch->is_copy)) { |
3cca928d | 1008 | if (check_index && cache_name_pos(new_name, strlen(new_name)) >= 0) |
a577284a LT |
1009 | return error("%s: already exists in index", new_name); |
1010 | if (!lstat(new_name, &st)) | |
1011 | return error("%s: already exists in working directory", new_name); | |
1012 | if (errno != ENOENT) | |
1013 | return error("%s: %s", new_name, strerror(errno)); | |
5aa7d94c LT |
1014 | if (!patch->new_mode) |
1015 | patch->new_mode = S_IFREG | 0644; | |
fab2c257 | 1016 | } |
3cca928d LT |
1017 | |
1018 | if (new_name && old_name) { | |
1019 | int same = !strcmp(old_name, new_name); | |
1020 | if (!patch->new_mode) | |
1021 | patch->new_mode = patch->old_mode; | |
1022 | if ((patch->old_mode ^ patch->new_mode) & S_IFMT) | |
1023 | return error("new mode (%o) of %s does not match old mode (%o)%s%s", | |
1024 | patch->new_mode, new_name, patch->old_mode, | |
1025 | same ? "" : " of ", same ? "" : old_name); | |
1026 | } | |
1027 | ||
1028 | if (apply_data(patch, &st) < 0) | |
1029 | return error("%s: patch does not apply", old_name); | |
a577284a | 1030 | return 0; |
fab2c257 LT |
1031 | } |
1032 | ||
a577284a | 1033 | static int check_patch_list(struct patch *patch) |
19c58fb8 | 1034 | { |
a577284a LT |
1035 | int error = 0; |
1036 | ||
1037 | for (;patch ; patch = patch->next) | |
1038 | error |= check_patch(patch); | |
1039 | return error; | |
1040 | } | |
1041 | ||
1042 | static void show_file(int c, unsigned int mode, const char *name) | |
1043 | { | |
1044 | printf("%c %o %s\n", c, mode, name); | |
1045 | } | |
3f40315a | 1046 | |
a577284a LT |
1047 | static void show_file_list(struct patch *patch) |
1048 | { | |
1049 | for (;patch ; patch = patch->next) { | |
1050 | if (patch->is_rename) { | |
1051 | show_file('-', patch->old_mode, patch->old_name); | |
1052 | show_file('+', patch->new_mode, patch->new_name); | |
1053 | continue; | |
1054 | } | |
1055 | if (patch->is_copy || patch->is_new) { | |
1056 | show_file('+', patch->new_mode, patch->new_name); | |
1057 | continue; | |
1058 | } | |
1059 | if (patch->is_delete) { | |
1060 | show_file('-', patch->old_mode, patch->old_name); | |
1061 | continue; | |
1062 | } | |
1063 | if (patch->old_mode && patch->new_mode && patch->old_mode != patch->new_mode) { | |
1064 | printf("M %o:%o %s\n", patch->old_mode, patch->new_mode, patch->old_name); | |
1065 | continue; | |
19c58fb8 | 1066 | } |
a577284a LT |
1067 | printf("M %o %s\n", patch->old_mode, patch->old_name); |
1068 | } | |
1069 | } | |
fab2c257 | 1070 | |
a577284a LT |
1071 | static void stat_patch_list(struct patch *patch) |
1072 | { | |
1073 | int files, adds, dels; | |
1074 | ||
1075 | for (files = adds = dels = 0 ; patch ; patch = patch->next) { | |
1076 | files++; | |
1077 | adds += patch->lines_added; | |
1078 | dels += patch->lines_deleted; | |
1079 | show_stats(patch); | |
1080 | } | |
1081 | ||
1082 | printf(" %d files changed, %d insertions(+), %d deletions(-)\n", files, adds, dels); | |
3f40315a LT |
1083 | } |
1084 | ||
1085 | static void patch_stats(struct patch *patch) | |
1086 | { | |
1087 | int lines = patch->lines_added + patch->lines_deleted; | |
1088 | ||
1089 | if (lines > max_change) | |
1090 | max_change = lines; | |
1091 | if (patch->old_name) { | |
1092 | int len = strlen(patch->old_name); | |
1093 | if (len > max_len) | |
1094 | max_len = len; | |
1095 | } | |
1096 | if (patch->new_name) { | |
1097 | int len = strlen(patch->new_name); | |
1098 | if (len > max_len) | |
1099 | max_len = len; | |
1100 | } | |
19c58fb8 LT |
1101 | } |
1102 | ||
5aa7d94c LT |
1103 | static void remove_file(struct patch *patch) |
1104 | { | |
1105 | if (write_index) { | |
1106 | if (remove_file_from_cache(patch->old_name) < 0) | |
1107 | die("unable to remove %s from index", patch->old_name); | |
1108 | } | |
1109 | unlink(patch->old_name); | |
1110 | } | |
1111 | ||
1112 | static void add_index_file(const char *path, unsigned mode, void *buf, unsigned long size) | |
1113 | { | |
1114 | struct stat st; | |
1115 | struct cache_entry *ce; | |
1116 | int namelen = strlen(path); | |
1117 | unsigned ce_size = cache_entry_size(namelen); | |
1118 | ||
1119 | if (!write_index) | |
1120 | return; | |
1121 | ||
1122 | ce = xmalloc(ce_size); | |
1123 | memset(ce, 0, ce_size); | |
1124 | memcpy(ce->name, path, namelen); | |
1125 | ce->ce_mode = create_ce_mode(mode); | |
1126 | ce->ce_flags = htons(namelen); | |
1127 | if (lstat(path, &st) < 0) | |
1128 | die("unable to stat newly created file %s", path); | |
1129 | fill_stat_cache_info(ce, &st); | |
1130 | if (write_sha1_file(buf, size, "blob", ce->sha1) < 0) | |
1131 | die("unable to create backing store for newly created file %s", path); | |
1132 | if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0) | |
1133 | die("unable to add cache entry for %s", path); | |
1134 | } | |
1135 | ||
1136 | static void create_file(struct patch *patch) | |
1137 | { | |
1138 | const char *path = patch->new_name; | |
1139 | unsigned mode = patch->new_mode; | |
1140 | unsigned long size = patch->resultsize; | |
1141 | char *buf = patch->result; | |
1142 | ||
1143 | if (!mode) | |
1144 | mode = S_IFREG | 0644; | |
1145 | if (S_ISREG(mode)) { | |
1146 | int fd; | |
1147 | mode = (mode & 0100) ? 0777 : 0666; | |
1148 | fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, mode); | |
1149 | if (fd < 0) | |
1150 | die("unable to create file %s (%s)", path, strerror(errno)); | |
1151 | if (write(fd, buf, size) != size) | |
1152 | die("unable to write file %s", path); | |
1153 | close(fd); | |
1154 | add_index_file(path, mode, buf, size); | |
1155 | return; | |
1156 | } | |
1157 | if (S_ISLNK(mode)) { | |
1158 | if (size && buf[size-1] == '\n') | |
1159 | size--; | |
1160 | buf[size] = 0; | |
1161 | if (symlink(buf, path) < 0) | |
1162 | die("unable to write symlink %s", path); | |
1163 | add_index_file(path, mode, buf, size); | |
1164 | return; | |
1165 | } | |
1166 | die("unable to write file mode %o", mode); | |
1167 | } | |
1168 | ||
1169 | static void write_out_one_result(struct patch *patch) | |
1170 | { | |
1171 | if (patch->is_delete > 0) { | |
1172 | remove_file(patch); | |
1173 | return; | |
1174 | } | |
1175 | if (patch->is_new > 0 || patch->is_copy) { | |
1176 | create_file(patch); | |
1177 | return; | |
1178 | } | |
1179 | /* | |
1180 | * Rename or modification boils down to the same | |
1181 | * thing: remove the old, write the new | |
1182 | */ | |
1183 | remove_file(patch); | |
1184 | create_file(patch); | |
1185 | } | |
1186 | ||
1187 | static void write_out_results(struct patch *list) | |
1188 | { | |
1189 | while (list) { | |
1190 | write_out_one_result(list); | |
1191 | list = list->next; | |
1192 | } | |
1193 | } | |
1194 | ||
1195 | static struct cache_file cache_file; | |
1196 | ||
c1bb9350 LT |
1197 | static int apply_patch(int fd) |
1198 | { | |
5aa7d94c | 1199 | int newfd; |
c1bb9350 LT |
1200 | unsigned long offset, size; |
1201 | char *buffer = read_patch_file(fd, &size); | |
19c58fb8 | 1202 | struct patch *list = NULL, **listp = &list; |
c1bb9350 LT |
1203 | |
1204 | if (!buffer) | |
1205 | return -1; | |
1206 | offset = 0; | |
1207 | while (size > 0) { | |
19c58fb8 LT |
1208 | struct patch *patch; |
1209 | int nr; | |
1210 | ||
1211 | patch = xmalloc(sizeof(*patch)); | |
1212 | memset(patch, 0, sizeof(*patch)); | |
1213 | nr = parse_chunk(buffer + offset, size, patch); | |
c1bb9350 LT |
1214 | if (nr < 0) |
1215 | break; | |
3f40315a | 1216 | patch_stats(patch); |
19c58fb8 LT |
1217 | *listp = patch; |
1218 | listp = &patch->next; | |
c1bb9350 LT |
1219 | offset += nr; |
1220 | size -= nr; | |
1221 | } | |
19c58fb8 | 1222 | |
5aa7d94c LT |
1223 | newfd = -1; |
1224 | write_index = check_index && apply; | |
1225 | if (write_index) | |
1226 | newfd = hold_index_file_for_update(&cache_file, get_index_file()); | |
1227 | if (check_index) { | |
1228 | if (read_cache() < 0) | |
1229 | die("unable to read index file"); | |
1230 | } | |
1231 | ||
a577284a LT |
1232 | if ((check || apply) && check_patch_list(list) < 0) |
1233 | exit(1); | |
1234 | ||
5aa7d94c LT |
1235 | if (apply) |
1236 | write_out_results(list); | |
1237 | ||
1238 | if (write_index) { | |
1239 | if (write_cache(newfd, active_cache, active_nr) || | |
1240 | commit_index_file(&cache_file)) | |
1241 | die("Unable to write new cachefile"); | |
1242 | } | |
1243 | ||
a577284a LT |
1244 | if (show_files) |
1245 | show_file_list(list); | |
1246 | ||
1247 | if (diffstat) | |
1248 | stat_patch_list(list); | |
19c58fb8 | 1249 | |
c1bb9350 LT |
1250 | free(buffer); |
1251 | return 0; | |
1252 | } | |
1253 | ||
1254 | int main(int argc, char **argv) | |
1255 | { | |
1256 | int i; | |
4dfdbe10 | 1257 | int read_stdin = 1; |
c1bb9350 | 1258 | |
c1bb9350 LT |
1259 | for (i = 1; i < argc; i++) { |
1260 | const char *arg = argv[i]; | |
1261 | int fd; | |
1262 | ||
1263 | if (!strcmp(arg, "-")) { | |
1264 | apply_patch(0); | |
4dfdbe10 | 1265 | read_stdin = 0; |
c1bb9350 LT |
1266 | continue; |
1267 | } | |
1268 | if (!strcmp(arg, "--no-merge")) { | |
1269 | merge_patch = 0; | |
1270 | continue; | |
1271 | } | |
fab2c257 | 1272 | if (!strcmp(arg, "--stat")) { |
a577284a | 1273 | apply = 0; |
fab2c257 LT |
1274 | diffstat = 1; |
1275 | continue; | |
1276 | } | |
a577284a LT |
1277 | if (!strcmp(arg, "--check")) { |
1278 | apply = 0; | |
1279 | check = 1; | |
1280 | continue; | |
1281 | } | |
3cca928d LT |
1282 | if (!strcmp(arg, "--index")) { |
1283 | check_index = 1; | |
1284 | continue; | |
1285 | } | |
a577284a LT |
1286 | if (!strcmp(arg, "--show-files")) { |
1287 | show_files = 1; | |
1288 | continue; | |
1289 | } | |
c1bb9350 LT |
1290 | fd = open(arg, O_RDONLY); |
1291 | if (fd < 0) | |
1292 | usage(apply_usage); | |
4dfdbe10 | 1293 | read_stdin = 0; |
c1bb9350 LT |
1294 | apply_patch(fd); |
1295 | close(fd); | |
1296 | } | |
4dfdbe10 LT |
1297 | if (read_stdin) |
1298 | apply_patch(0); | |
c1bb9350 LT |
1299 | return 0; |
1300 | } |