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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 }, | |
dc938417 LT |
440 | { "rename from ", gitdiff_renamesrc }, |
441 | { "rename to ", gitdiff_renamedst }, | |
a4acb0eb | 442 | { "similarity index ", gitdiff_similarity }, |
70aadac0 | 443 | { "dissimilarity index ", gitdiff_dissimilarity }, |
9a4a100e | 444 | { "", gitdiff_unrecognized }, |
a4acb0eb LT |
445 | }; |
446 | int i; | |
c1bb9350 | 447 | |
c1bb9350 | 448 | len = linelen(line, size); |
a4acb0eb | 449 | if (!len || line[len-1] != '\n') |
c1bb9350 | 450 | break; |
a4acb0eb LT |
451 | for (i = 0; i < sizeof(optable) / sizeof(optable[0]); i++) { |
452 | const struct opentry *p = optable + i; | |
453 | int oplen = strlen(p->str); | |
454 | if (len < oplen || memcmp(p->str, line, oplen)) | |
455 | continue; | |
19c58fb8 | 456 | if (p->fn(line + oplen, patch) < 0) |
a4acb0eb | 457 | return offset; |
9a4a100e | 458 | break; |
a4acb0eb | 459 | } |
c1bb9350 LT |
460 | } |
461 | ||
a4acb0eb | 462 | return offset; |
c1bb9350 LT |
463 | } |
464 | ||
fab2c257 | 465 | static int parse_num(const char *line, unsigned long *p) |
46979f56 LT |
466 | { |
467 | char *ptr; | |
fab2c257 LT |
468 | |
469 | if (!isdigit(*line)) | |
470 | return 0; | |
471 | *p = strtoul(line, &ptr, 10); | |
472 | return ptr - line; | |
473 | } | |
474 | ||
475 | static int parse_range(const char *line, int len, int offset, const char *expect, | |
476 | unsigned long *p1, unsigned long *p2) | |
477 | { | |
46979f56 LT |
478 | int digits, ex; |
479 | ||
480 | if (offset < 0 || offset >= len) | |
481 | return -1; | |
482 | line += offset; | |
483 | len -= offset; | |
484 | ||
fab2c257 LT |
485 | digits = parse_num(line, p1); |
486 | if (!digits) | |
46979f56 | 487 | return -1; |
46979f56 LT |
488 | |
489 | offset += digits; | |
490 | line += digits; | |
491 | len -= digits; | |
492 | ||
fab2c257 LT |
493 | *p2 = *p1; |
494 | if (*line == ',') { | |
495 | digits = parse_num(line+1, p2); | |
496 | if (!digits) | |
497 | return -1; | |
498 | ||
499 | offset += digits+1; | |
500 | line += digits+1; | |
501 | len -= digits+1; | |
502 | } | |
503 | ||
46979f56 LT |
504 | ex = strlen(expect); |
505 | if (ex > len) | |
506 | return -1; | |
507 | if (memcmp(line, expect, ex)) | |
508 | return -1; | |
509 | ||
510 | return offset + ex; | |
511 | } | |
512 | ||
513 | /* | |
514 | * Parse a unified diff fragment header of the | |
515 | * form "@@ -a,b +c,d @@" | |
516 | */ | |
19c58fb8 | 517 | static int parse_fragment_header(char *line, int len, struct fragment *fragment) |
46979f56 LT |
518 | { |
519 | int offset; | |
520 | ||
521 | if (!len || line[len-1] != '\n') | |
522 | return -1; | |
523 | ||
524 | /* Figure out the number of lines in a fragment */ | |
fab2c257 LT |
525 | offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines); |
526 | offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines); | |
46979f56 LT |
527 | |
528 | return offset; | |
529 | } | |
530 | ||
19c58fb8 | 531 | static int find_header(char *line, unsigned long size, int *hdrsize, struct patch *patch) |
c1bb9350 LT |
532 | { |
533 | unsigned long offset, len; | |
534 | ||
19c58fb8 LT |
535 | patch->is_rename = patch->is_copy = 0; |
536 | patch->is_new = patch->is_delete = -1; | |
537 | patch->old_mode = patch->new_mode = 0; | |
538 | patch->old_name = patch->new_name = NULL; | |
46979f56 | 539 | for (offset = 0; size > 0; offset += len, size -= len, line += len, linenr++) { |
c1bb9350 LT |
540 | unsigned long nextlen; |
541 | ||
542 | len = linelen(line, size); | |
543 | if (!len) | |
544 | break; | |
545 | ||
546 | /* Testing this early allows us to take a few shortcuts.. */ | |
547 | if (len < 6) | |
548 | continue; | |
46979f56 LT |
549 | |
550 | /* | |
551 | * Make sure we don't find any unconnected patch fragmants. | |
552 | * That's a sign that we didn't find a header, and that a | |
553 | * patch has become corrupted/broken up. | |
554 | */ | |
555 | if (!memcmp("@@ -", line, 4)) { | |
19c58fb8 LT |
556 | struct fragment dummy; |
557 | if (parse_fragment_header(line, len, &dummy) < 0) | |
46979f56 LT |
558 | continue; |
559 | error("patch fragment without header at line %d: %.*s", linenr, len-1, line); | |
560 | } | |
561 | ||
c1bb9350 LT |
562 | if (size < len + 6) |
563 | break; | |
564 | ||
565 | /* | |
566 | * Git patch? It might not have a real patch, just a rename | |
567 | * or mode change, so we handle that specially | |
568 | */ | |
569 | if (!memcmp("diff --git ", line, 11)) { | |
19c58fb8 | 570 | int git_hdr_len = parse_git_header(line, len, size, patch); |
206de27e | 571 | if (git_hdr_len <= len) |
c1bb9350 | 572 | continue; |
5041aa70 | 573 | if (!patch->old_name && !patch->new_name) |
33f4d087 | 574 | die("git diff header lacks filename information (line %d)", linenr); |
a4acb0eb | 575 | *hdrsize = git_hdr_len; |
c1bb9350 LT |
576 | return offset; |
577 | } | |
578 | ||
579 | /** --- followed by +++ ? */ | |
580 | if (memcmp("--- ", line, 4) || memcmp("+++ ", line + len, 4)) | |
581 | continue; | |
582 | ||
583 | /* | |
584 | * We only accept unified patches, so we want it to | |
585 | * at least have "@@ -a,b +c,d @@\n", which is 14 chars | |
586 | * minimum | |
587 | */ | |
588 | nextlen = linelen(line + len, size - len); | |
589 | if (size < nextlen + 14 || memcmp("@@ -", line + len + nextlen, 4)) | |
590 | continue; | |
591 | ||
592 | /* Ok, we'll consider it a patch */ | |
19c58fb8 | 593 | parse_traditional_patch(line, line+len, patch); |
c1bb9350 | 594 | *hdrsize = len + nextlen; |
46979f56 | 595 | linenr += 2; |
c1bb9350 LT |
596 | return offset; |
597 | } | |
598 | return -1; | |
599 | } | |
600 | ||
c1bb9350 LT |
601 | /* |
602 | * Parse a unified diff. Note that this really needs | |
603 | * to parse each fragment separately, since the only | |
604 | * way to know the difference between a "---" that is | |
605 | * part of a patch, and a "---" that starts the next | |
606 | * patch is to look at the line counts.. | |
607 | */ | |
19c58fb8 | 608 | static int parse_fragment(char *line, unsigned long size, struct patch *patch, struct fragment *fragment) |
c1bb9350 | 609 | { |
3f40315a | 610 | int added, deleted; |
c1bb9350 | 611 | int len = linelen(line, size), offset; |
30996652 | 612 | unsigned long oldlines, newlines; |
c1bb9350 | 613 | |
19c58fb8 | 614 | offset = parse_fragment_header(line, len, fragment); |
c1bb9350 LT |
615 | if (offset < 0) |
616 | return -1; | |
19c58fb8 LT |
617 | oldlines = fragment->oldlines; |
618 | newlines = fragment->newlines; | |
c1bb9350 | 619 | |
30996652 LT |
620 | if (patch->is_new < 0) { |
621 | patch->is_new = !oldlines; | |
622 | if (!oldlines) | |
623 | patch->old_name = NULL; | |
624 | } | |
625 | if (patch->is_delete < 0) { | |
626 | patch->is_delete = !newlines; | |
627 | if (!newlines) | |
628 | patch->new_name = NULL; | |
629 | } | |
630 | ||
631 | if (patch->is_new != !oldlines) | |
632 | return error("new file depends on old contents"); | |
af3f929f LT |
633 | if (patch->is_delete != !newlines) { |
634 | if (newlines) | |
635 | return error("deleted file still has contents"); | |
636 | fprintf(stderr, "** warning: file %s becomes empty but is not deleted\n", patch->new_name); | |
637 | } | |
a4acb0eb | 638 | |
c1bb9350 LT |
639 | /* Parse the thing.. */ |
640 | line += len; | |
641 | size -= len; | |
46979f56 | 642 | linenr++; |
3f40315a | 643 | added = deleted = 0; |
46979f56 | 644 | for (offset = len; size > 0; offset += len, size -= len, line += len, linenr++) { |
c1bb9350 LT |
645 | if (!oldlines && !newlines) |
646 | break; | |
647 | len = linelen(line, size); | |
648 | if (!len || line[len-1] != '\n') | |
649 | return -1; | |
650 | switch (*line) { | |
651 | default: | |
652 | return -1; | |
653 | case ' ': | |
654 | oldlines--; | |
655 | newlines--; | |
656 | break; | |
657 | case '-': | |
3f40315a | 658 | deleted++; |
c1bb9350 LT |
659 | oldlines--; |
660 | break; | |
661 | case '+': | |
3f40315a | 662 | added++; |
c1bb9350 LT |
663 | newlines--; |
664 | break; | |
fab2c257 LT |
665 | /* We allow "\ No newline at end of file" */ |
666 | case '\\': | |
3cca928d LT |
667 | if (len < 12 || memcmp(line, "\\ No newline", 12)) |
668 | return -1; | |
fab2c257 | 669 | break; |
c1bb9350 LT |
670 | } |
671 | } | |
3f40315a LT |
672 | patch->lines_added += added; |
673 | patch->lines_deleted += deleted; | |
c1bb9350 LT |
674 | return offset; |
675 | } | |
676 | ||
19c58fb8 | 677 | static int parse_single_patch(char *line, unsigned long size, struct patch *patch) |
c1bb9350 LT |
678 | { |
679 | unsigned long offset = 0; | |
19c58fb8 | 680 | struct fragment **fragp = &patch->fragments; |
c1bb9350 LT |
681 | |
682 | while (size > 4 && !memcmp(line, "@@ -", 4)) { | |
19c58fb8 LT |
683 | struct fragment *fragment; |
684 | int len; | |
685 | ||
686 | fragment = xmalloc(sizeof(*fragment)); | |
687 | memset(fragment, 0, sizeof(*fragment)); | |
688 | len = parse_fragment(line, size, patch, fragment); | |
c1bb9350 | 689 | if (len <= 0) |
46979f56 | 690 | die("corrupt patch at line %d", linenr); |
c1bb9350 | 691 | |
19c58fb8 LT |
692 | fragment->patch = line; |
693 | fragment->size = len; | |
694 | ||
695 | *fragp = fragment; | |
696 | fragp = &fragment->next; | |
c1bb9350 LT |
697 | |
698 | offset += len; | |
699 | line += len; | |
700 | size -= len; | |
701 | } | |
702 | return offset; | |
703 | } | |
704 | ||
19c58fb8 | 705 | static int parse_chunk(char *buffer, unsigned long size, struct patch *patch) |
c1bb9350 LT |
706 | { |
707 | int hdrsize, patchsize; | |
19c58fb8 | 708 | int offset = find_header(buffer, size, &hdrsize, patch); |
c1bb9350 LT |
709 | |
710 | if (offset < 0) | |
711 | return offset; | |
c1bb9350 | 712 | |
19c58fb8 | 713 | patchsize = parse_single_patch(buffer + offset + hdrsize, size - offset - hdrsize, patch); |
c1bb9350 LT |
714 | |
715 | return offset + hdrsize + patchsize; | |
716 | } | |
717 | ||
3f40315a LT |
718 | const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"; |
719 | const char minuses[]= "----------------------------------------------------------------------"; | |
720 | ||
721 | static void show_stats(struct patch *patch) | |
722 | { | |
723 | char *name = patch->old_name; | |
95bedc9e | 724 | int len, max, add, del, total; |
3f40315a | 725 | |
5041aa70 | 726 | if (!name) |
3f40315a LT |
727 | name = patch->new_name; |
728 | ||
729 | /* | |
730 | * "scale" the filename | |
731 | */ | |
732 | len = strlen(name); | |
733 | max = max_len; | |
734 | if (max > 50) | |
735 | max = 50; | |
736 | if (len > max) | |
737 | name += len - max; | |
738 | len = max; | |
739 | ||
740 | /* | |
741 | * scale the add/delete | |
742 | */ | |
743 | max = max_change; | |
744 | if (max + len > 70) | |
745 | max = 70 - len; | |
95bedc9e LT |
746 | |
747 | add = patch->lines_added; | |
748 | del = patch->lines_deleted; | |
749 | total = add + del; | |
750 | ||
751 | total = (total * max + max_change / 2) / max_change; | |
752 | add = (add * max + max_change / 2) / max_change; | |
753 | del = total - add; | |
3f40315a LT |
754 | printf(" %-*s |%5d %.*s%.*s\n", |
755 | len, name, patch->lines_added + patch->lines_deleted, | |
756 | add, pluses, del, minuses); | |
757 | } | |
758 | ||
3cca928d LT |
759 | static int read_old_data(struct stat *st, const char *path, void *buf, unsigned long size) |
760 | { | |
761 | int fd; | |
762 | unsigned long got; | |
763 | ||
764 | switch (st->st_mode & S_IFMT) { | |
765 | case S_IFLNK: | |
766 | return readlink(path, buf, size); | |
767 | case S_IFREG: | |
768 | fd = open(path, O_RDONLY); | |
769 | if (fd < 0) | |
770 | return error("unable to open %s", path); | |
771 | got = 0; | |
772 | for (;;) { | |
773 | int ret = read(fd, buf + got, size - got); | |
774 | if (ret < 0) { | |
775 | if (errno == EAGAIN) | |
776 | continue; | |
777 | break; | |
778 | } | |
779 | if (!ret) | |
780 | break; | |
781 | got += ret; | |
782 | } | |
783 | close(fd); | |
784 | return got; | |
785 | ||
786 | default: | |
787 | return -1; | |
788 | } | |
789 | } | |
790 | ||
791 | static int find_offset(const char *buf, unsigned long size, const char *fragment, unsigned long fragsize, int line) | |
792 | { | |
6e7c92a9 LT |
793 | int i; |
794 | unsigned long start, backwards, forwards; | |
3cca928d LT |
795 | |
796 | if (fragsize > size) | |
797 | return -1; | |
798 | ||
799 | start = 0; | |
800 | if (line > 1) { | |
3cca928d | 801 | unsigned long offset = 0; |
6e7c92a9 LT |
802 | i = line-1; |
803 | while (offset + fragsize <= size) { | |
3cca928d LT |
804 | if (buf[offset++] == '\n') { |
805 | start = offset; | |
6e7c92a9 | 806 | if (!--i) |
3cca928d LT |
807 | break; |
808 | } | |
809 | } | |
810 | } | |
811 | ||
812 | /* Exact line number? */ | |
813 | if (!memcmp(buf + start, fragment, fragsize)) | |
814 | return start; | |
815 | ||
6e7c92a9 LT |
816 | /* |
817 | * There's probably some smart way to do this, but I'll leave | |
818 | * that to the smart and beautiful people. I'm simple and stupid. | |
819 | */ | |
820 | backwards = start; | |
821 | forwards = start; | |
822 | for (i = 0; ; i++) { | |
823 | unsigned long try; | |
824 | int n; | |
825 | ||
826 | /* "backward" */ | |
827 | if (i & 1) { | |
828 | if (!backwards) { | |
829 | if (forwards + fragsize > size) | |
830 | break; | |
831 | continue; | |
832 | } | |
833 | do { | |
834 | --backwards; | |
835 | } while (backwards && buf[backwards-1] != '\n'); | |
836 | try = backwards; | |
837 | } else { | |
838 | while (forwards + fragsize <= size) { | |
839 | if (buf[forwards++] == '\n') | |
840 | break; | |
841 | } | |
842 | try = forwards; | |
843 | } | |
844 | ||
845 | if (try + fragsize > size) | |
846 | continue; | |
847 | if (memcmp(buf + try, fragment, fragsize)) | |
848 | continue; | |
849 | n = (i >> 1)+1; | |
850 | if (i & 1) | |
851 | n = -n; | |
852 | fprintf(stderr, "Fragment applied at offset %d\n", n); | |
853 | return try; | |
854 | } | |
855 | ||
3cca928d LT |
856 | /* |
857 | * We should start searching forward and backward. | |
858 | */ | |
859 | return -1; | |
860 | } | |
861 | ||
6e7c92a9 LT |
862 | struct buffer_desc { |
863 | char *buffer; | |
864 | unsigned long size; | |
865 | unsigned long alloc; | |
866 | }; | |
867 | ||
868 | static int apply_one_fragment(struct buffer_desc *desc, struct fragment *frag) | |
3cca928d | 869 | { |
6e7c92a9 | 870 | char *buf = desc->buffer; |
3cca928d LT |
871 | const char *patch = frag->patch; |
872 | int offset, size = frag->size; | |
873 | char *old = xmalloc(size); | |
874 | char *new = xmalloc(size); | |
875 | int oldsize = 0, newsize = 0; | |
876 | ||
877 | while (size > 0) { | |
878 | int len = linelen(patch, size); | |
879 | int plen; | |
880 | ||
881 | if (!len) | |
882 | break; | |
883 | ||
884 | /* | |
885 | * "plen" is how much of the line we should use for | |
886 | * the actual patch data. Normally we just remove the | |
887 | * first character on the line, but if the line is | |
888 | * followed by "\ No newline", then we also remove the | |
889 | * last one (which is the newline, of course). | |
890 | */ | |
891 | plen = len-1; | |
892 | if (len > size && patch[len] == '\\') | |
893 | plen--; | |
894 | switch (*patch) { | |
895 | case ' ': | |
896 | case '-': | |
897 | memcpy(old + oldsize, patch + 1, plen); | |
898 | oldsize += plen; | |
899 | if (*patch == '-') | |
900 | break; | |
901 | /* Fall-through for ' ' */ | |
902 | case '+': | |
903 | memcpy(new + newsize, patch + 1, plen); | |
904 | newsize += plen; | |
905 | break; | |
906 | case '@': case '\\': | |
907 | /* Ignore it, we already handled it */ | |
908 | break; | |
909 | default: | |
910 | return -1; | |
911 | } | |
912 | patch += len; | |
913 | size -= len; | |
914 | } | |
915 | ||
6e7c92a9 | 916 | offset = find_offset(buf, desc->size, old, oldsize, frag->newpos); |
3cca928d | 917 | if (offset >= 0) { |
6e7c92a9 LT |
918 | int diff = newsize - oldsize; |
919 | unsigned long size = desc->size + diff; | |
920 | unsigned long alloc = desc->alloc; | |
921 | ||
922 | if (size > alloc) { | |
923 | alloc = size + 8192; | |
924 | desc->alloc = alloc; | |
925 | buf = xrealloc(buf, alloc); | |
926 | desc->buffer = buf; | |
927 | } | |
928 | desc->size = size; | |
929 | memmove(buf + offset + newsize, buf + offset + oldsize, size - offset - newsize); | |
930 | memcpy(buf + offset, new, newsize); | |
3cca928d LT |
931 | offset = 0; |
932 | } | |
933 | ||
934 | free(old); | |
935 | free(new); | |
936 | return offset; | |
937 | } | |
938 | ||
6e7c92a9 | 939 | static int apply_fragments(struct buffer_desc *desc, struct patch *patch) |
3cca928d LT |
940 | { |
941 | struct fragment *frag = patch->fragments; | |
942 | ||
943 | while (frag) { | |
6e7c92a9 | 944 | if (apply_one_fragment(desc, frag) < 0) |
3cca928d LT |
945 | return error("patch failed: %s:%d", patch->old_name, frag->oldpos); |
946 | frag = frag->next; | |
947 | } | |
30996652 | 948 | return 0; |
3cca928d LT |
949 | } |
950 | ||
951 | static int apply_data(struct patch *patch, struct stat *st) | |
952 | { | |
6e7c92a9 LT |
953 | char *buf; |
954 | unsigned long size, alloc; | |
955 | struct buffer_desc desc; | |
3cca928d | 956 | |
30996652 LT |
957 | size = 0; |
958 | alloc = 0; | |
959 | buf = NULL; | |
960 | if (patch->old_name) { | |
961 | size = st->st_size; | |
962 | alloc = size + 8192; | |
963 | buf = xmalloc(alloc); | |
964 | if (read_old_data(st, patch->old_name, buf, alloc) != size) | |
965 | return error("read of %s failed", patch->old_name); | |
966 | } | |
6e7c92a9 LT |
967 | |
968 | desc.size = size; | |
969 | desc.alloc = alloc; | |
970 | desc.buffer = buf; | |
971 | if (apply_fragments(&desc, patch) < 0) | |
3cca928d | 972 | return -1; |
6e7c92a9 LT |
973 | patch->result = desc.buffer; |
974 | patch->resultsize = desc.size; | |
5aa7d94c LT |
975 | |
976 | if (patch->is_delete && patch->resultsize) | |
977 | return error("removal patch leaves file contents"); | |
978 | ||
3cca928d LT |
979 | return 0; |
980 | } | |
981 | ||
a577284a | 982 | static int check_patch(struct patch *patch) |
fab2c257 | 983 | { |
a577284a | 984 | struct stat st; |
fab2c257 LT |
985 | const char *old_name = patch->old_name; |
986 | const char *new_name = patch->new_name; | |
987 | ||
988 | if (old_name) { | |
a577284a LT |
989 | int changed; |
990 | ||
a577284a LT |
991 | if (lstat(old_name, &st) < 0) |
992 | return error("%s: %s\n", strerror(errno)); | |
3cca928d LT |
993 | if (check_index) { |
994 | int pos = cache_name_pos(old_name, strlen(old_name)); | |
995 | if (pos < 0) | |
996 | return error("%s: does not exist in index", old_name); | |
997 | changed = ce_match_stat(active_cache[pos], &st); | |
998 | if (changed) | |
999 | return error("%s: does not match index", old_name); | |
1000 | } | |
1001 | if (patch->is_new < 0) | |
1002 | patch->is_new = 0; | |
a577284a LT |
1003 | if (!patch->old_mode) |
1004 | patch->old_mode = st.st_mode; | |
3cca928d LT |
1005 | if ((st.st_mode ^ patch->old_mode) & S_IFMT) |
1006 | return error("%s: wrong type", old_name); | |
1007 | if (st.st_mode != patch->old_mode) | |
1008 | fprintf(stderr, "warning: %s has type %o, expected %o\n", | |
1009 | old_name, st.st_mode, patch->old_mode); | |
fab2c257 | 1010 | } |
a577284a | 1011 | |
fab2c257 | 1012 | if (new_name && (patch->is_new | patch->is_rename | patch->is_copy)) { |
3cca928d | 1013 | if (check_index && cache_name_pos(new_name, strlen(new_name)) >= 0) |
a577284a LT |
1014 | return error("%s: already exists in index", new_name); |
1015 | if (!lstat(new_name, &st)) | |
1016 | return error("%s: already exists in working directory", new_name); | |
1017 | if (errno != ENOENT) | |
1018 | return error("%s: %s", new_name, strerror(errno)); | |
5aa7d94c LT |
1019 | if (!patch->new_mode) |
1020 | patch->new_mode = S_IFREG | 0644; | |
fab2c257 | 1021 | } |
3cca928d LT |
1022 | |
1023 | if (new_name && old_name) { | |
1024 | int same = !strcmp(old_name, new_name); | |
1025 | if (!patch->new_mode) | |
1026 | patch->new_mode = patch->old_mode; | |
1027 | if ((patch->old_mode ^ patch->new_mode) & S_IFMT) | |
1028 | return error("new mode (%o) of %s does not match old mode (%o)%s%s", | |
1029 | patch->new_mode, new_name, patch->old_mode, | |
1030 | same ? "" : " of ", same ? "" : old_name); | |
1031 | } | |
1032 | ||
1033 | if (apply_data(patch, &st) < 0) | |
1034 | return error("%s: patch does not apply", old_name); | |
a577284a | 1035 | return 0; |
fab2c257 LT |
1036 | } |
1037 | ||
a577284a | 1038 | static int check_patch_list(struct patch *patch) |
19c58fb8 | 1039 | { |
a577284a LT |
1040 | int error = 0; |
1041 | ||
1042 | for (;patch ; patch = patch->next) | |
1043 | error |= check_patch(patch); | |
1044 | return error; | |
1045 | } | |
1046 | ||
1047 | static void show_file(int c, unsigned int mode, const char *name) | |
1048 | { | |
1049 | printf("%c %o %s\n", c, mode, name); | |
1050 | } | |
3f40315a | 1051 | |
a577284a LT |
1052 | static void show_file_list(struct patch *patch) |
1053 | { | |
1054 | for (;patch ; patch = patch->next) { | |
1055 | if (patch->is_rename) { | |
1056 | show_file('-', patch->old_mode, patch->old_name); | |
1057 | show_file('+', patch->new_mode, patch->new_name); | |
1058 | continue; | |
1059 | } | |
1060 | if (patch->is_copy || patch->is_new) { | |
1061 | show_file('+', patch->new_mode, patch->new_name); | |
1062 | continue; | |
1063 | } | |
1064 | if (patch->is_delete) { | |
1065 | show_file('-', patch->old_mode, patch->old_name); | |
1066 | continue; | |
1067 | } | |
1068 | if (patch->old_mode && patch->new_mode && patch->old_mode != patch->new_mode) { | |
1069 | printf("M %o:%o %s\n", patch->old_mode, patch->new_mode, patch->old_name); | |
1070 | continue; | |
19c58fb8 | 1071 | } |
a577284a LT |
1072 | printf("M %o %s\n", patch->old_mode, patch->old_name); |
1073 | } | |
1074 | } | |
fab2c257 | 1075 | |
a577284a LT |
1076 | static void stat_patch_list(struct patch *patch) |
1077 | { | |
1078 | int files, adds, dels; | |
1079 | ||
1080 | for (files = adds = dels = 0 ; patch ; patch = patch->next) { | |
1081 | files++; | |
1082 | adds += patch->lines_added; | |
1083 | dels += patch->lines_deleted; | |
1084 | show_stats(patch); | |
1085 | } | |
1086 | ||
1087 | printf(" %d files changed, %d insertions(+), %d deletions(-)\n", files, adds, dels); | |
3f40315a LT |
1088 | } |
1089 | ||
1090 | static void patch_stats(struct patch *patch) | |
1091 | { | |
1092 | int lines = patch->lines_added + patch->lines_deleted; | |
1093 | ||
1094 | if (lines > max_change) | |
1095 | max_change = lines; | |
1096 | if (patch->old_name) { | |
1097 | int len = strlen(patch->old_name); | |
1098 | if (len > max_len) | |
1099 | max_len = len; | |
1100 | } | |
1101 | if (patch->new_name) { | |
1102 | int len = strlen(patch->new_name); | |
1103 | if (len > max_len) | |
1104 | max_len = len; | |
1105 | } | |
19c58fb8 LT |
1106 | } |
1107 | ||
5aa7d94c LT |
1108 | static void remove_file(struct patch *patch) |
1109 | { | |
1110 | if (write_index) { | |
1111 | if (remove_file_from_cache(patch->old_name) < 0) | |
1112 | die("unable to remove %s from index", patch->old_name); | |
1113 | } | |
1114 | unlink(patch->old_name); | |
1115 | } | |
1116 | ||
1117 | static void add_index_file(const char *path, unsigned mode, void *buf, unsigned long size) | |
1118 | { | |
1119 | struct stat st; | |
1120 | struct cache_entry *ce; | |
1121 | int namelen = strlen(path); | |
1122 | unsigned ce_size = cache_entry_size(namelen); | |
1123 | ||
1124 | if (!write_index) | |
1125 | return; | |
1126 | ||
1127 | ce = xmalloc(ce_size); | |
1128 | memset(ce, 0, ce_size); | |
1129 | memcpy(ce->name, path, namelen); | |
1130 | ce->ce_mode = create_ce_mode(mode); | |
1131 | ce->ce_flags = htons(namelen); | |
1132 | if (lstat(path, &st) < 0) | |
1133 | die("unable to stat newly created file %s", path); | |
1134 | fill_stat_cache_info(ce, &st); | |
1135 | if (write_sha1_file(buf, size, "blob", ce->sha1) < 0) | |
1136 | die("unable to create backing store for newly created file %s", path); | |
1137 | if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0) | |
1138 | die("unable to add cache entry for %s", path); | |
1139 | } | |
1140 | ||
1141 | static void create_file(struct patch *patch) | |
1142 | { | |
1143 | const char *path = patch->new_name; | |
1144 | unsigned mode = patch->new_mode; | |
1145 | unsigned long size = patch->resultsize; | |
1146 | char *buf = patch->result; | |
1147 | ||
1148 | if (!mode) | |
1149 | mode = S_IFREG | 0644; | |
1150 | if (S_ISREG(mode)) { | |
1151 | int fd; | |
1152 | mode = (mode & 0100) ? 0777 : 0666; | |
1153 | fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, mode); | |
1154 | if (fd < 0) | |
1155 | die("unable to create file %s (%s)", path, strerror(errno)); | |
1156 | if (write(fd, buf, size) != size) | |
1157 | die("unable to write file %s", path); | |
1158 | close(fd); | |
1159 | add_index_file(path, mode, buf, size); | |
1160 | return; | |
1161 | } | |
1162 | if (S_ISLNK(mode)) { | |
1163 | if (size && buf[size-1] == '\n') | |
1164 | size--; | |
1165 | buf[size] = 0; | |
1166 | if (symlink(buf, path) < 0) | |
1167 | die("unable to write symlink %s", path); | |
1168 | add_index_file(path, mode, buf, size); | |
1169 | return; | |
1170 | } | |
1171 | die("unable to write file mode %o", mode); | |
1172 | } | |
1173 | ||
1174 | static void write_out_one_result(struct patch *patch) | |
1175 | { | |
1176 | if (patch->is_delete > 0) { | |
1177 | remove_file(patch); | |
1178 | return; | |
1179 | } | |
1180 | if (patch->is_new > 0 || patch->is_copy) { | |
1181 | create_file(patch); | |
1182 | return; | |
1183 | } | |
1184 | /* | |
1185 | * Rename or modification boils down to the same | |
1186 | * thing: remove the old, write the new | |
1187 | */ | |
1188 | remove_file(patch); | |
1189 | create_file(patch); | |
1190 | } | |
1191 | ||
1192 | static void write_out_results(struct patch *list) | |
1193 | { | |
f7b79707 LT |
1194 | if (!list) |
1195 | die("No changes"); | |
1196 | ||
5aa7d94c LT |
1197 | while (list) { |
1198 | write_out_one_result(list); | |
1199 | list = list->next; | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | static struct cache_file cache_file; | |
1204 | ||
c1bb9350 LT |
1205 | static int apply_patch(int fd) |
1206 | { | |
5aa7d94c | 1207 | int newfd; |
c1bb9350 LT |
1208 | unsigned long offset, size; |
1209 | char *buffer = read_patch_file(fd, &size); | |
19c58fb8 | 1210 | struct patch *list = NULL, **listp = &list; |
c1bb9350 LT |
1211 | |
1212 | if (!buffer) | |
1213 | return -1; | |
1214 | offset = 0; | |
1215 | while (size > 0) { | |
19c58fb8 LT |
1216 | struct patch *patch; |
1217 | int nr; | |
1218 | ||
1219 | patch = xmalloc(sizeof(*patch)); | |
1220 | memset(patch, 0, sizeof(*patch)); | |
1221 | nr = parse_chunk(buffer + offset, size, patch); | |
c1bb9350 LT |
1222 | if (nr < 0) |
1223 | break; | |
3f40315a | 1224 | patch_stats(patch); |
19c58fb8 LT |
1225 | *listp = patch; |
1226 | listp = &patch->next; | |
c1bb9350 LT |
1227 | offset += nr; |
1228 | size -= nr; | |
1229 | } | |
19c58fb8 | 1230 | |
5aa7d94c LT |
1231 | newfd = -1; |
1232 | write_index = check_index && apply; | |
1233 | if (write_index) | |
1234 | newfd = hold_index_file_for_update(&cache_file, get_index_file()); | |
1235 | if (check_index) { | |
1236 | if (read_cache() < 0) | |
1237 | die("unable to read index file"); | |
1238 | } | |
1239 | ||
a577284a LT |
1240 | if ((check || apply) && check_patch_list(list) < 0) |
1241 | exit(1); | |
1242 | ||
5aa7d94c LT |
1243 | if (apply) |
1244 | write_out_results(list); | |
1245 | ||
1246 | if (write_index) { | |
1247 | if (write_cache(newfd, active_cache, active_nr) || | |
1248 | commit_index_file(&cache_file)) | |
1249 | die("Unable to write new cachefile"); | |
1250 | } | |
1251 | ||
a577284a LT |
1252 | if (show_files) |
1253 | show_file_list(list); | |
1254 | ||
1255 | if (diffstat) | |
1256 | stat_patch_list(list); | |
19c58fb8 | 1257 | |
c1bb9350 LT |
1258 | free(buffer); |
1259 | return 0; | |
1260 | } | |
1261 | ||
1262 | int main(int argc, char **argv) | |
1263 | { | |
1264 | int i; | |
4dfdbe10 | 1265 | int read_stdin = 1; |
c1bb9350 | 1266 | |
c1bb9350 LT |
1267 | for (i = 1; i < argc; i++) { |
1268 | const char *arg = argv[i]; | |
1269 | int fd; | |
1270 | ||
1271 | if (!strcmp(arg, "-")) { | |
1272 | apply_patch(0); | |
4dfdbe10 | 1273 | read_stdin = 0; |
c1bb9350 LT |
1274 | continue; |
1275 | } | |
1276 | if (!strcmp(arg, "--no-merge")) { | |
1277 | merge_patch = 0; | |
1278 | continue; | |
1279 | } | |
fab2c257 | 1280 | if (!strcmp(arg, "--stat")) { |
a577284a | 1281 | apply = 0; |
fab2c257 LT |
1282 | diffstat = 1; |
1283 | continue; | |
1284 | } | |
a577284a LT |
1285 | if (!strcmp(arg, "--check")) { |
1286 | apply = 0; | |
1287 | check = 1; | |
1288 | continue; | |
1289 | } | |
3cca928d LT |
1290 | if (!strcmp(arg, "--index")) { |
1291 | check_index = 1; | |
1292 | continue; | |
1293 | } | |
a577284a LT |
1294 | if (!strcmp(arg, "--show-files")) { |
1295 | show_files = 1; | |
1296 | continue; | |
1297 | } | |
c1bb9350 LT |
1298 | fd = open(arg, O_RDONLY); |
1299 | if (fd < 0) | |
1300 | usage(apply_usage); | |
4dfdbe10 | 1301 | read_stdin = 0; |
c1bb9350 LT |
1302 | apply_patch(fd); |
1303 | close(fd); | |
1304 | } | |
4dfdbe10 LT |
1305 | if (read_stdin) |
1306 | apply_patch(0); | |
c1bb9350 LT |
1307 | return 0; |
1308 | } |