Fix silly typo in new builtin grep
[git/git.git] / apply.c
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 */
9 #include <fnmatch.h>
10 #include "cache.h"
11 #include "quote.h"
12 #include "blob.h"
13
14 // --check turns on checking that the working tree matches the
15 // files that are being modified, but doesn't apply the patch
16 // --stat does just a diffstat, and doesn't actually apply
17 // --numstat does numeric diffstat, and doesn't actually apply
18 // --index-info shows the old and new index info for paths if available.
19 //
20 static const char *prefix;
21 static int prefix_length = -1;
22
23 static int p_value = 1;
24 static int allow_binary_replacement = 0;
25 static int check_index = 0;
26 static int write_index = 0;
27 static int diffstat = 0;
28 static int numstat = 0;
29 static int summary = 0;
30 static int check = 0;
31 static int apply = 1;
32 static int no_add = 0;
33 static int show_index_info = 0;
34 static int line_termination = '\n';
35 static unsigned long p_context = -1;
36 static const char apply_usage[] =
37 "git-apply [--stat] [--numstat] [--summary] [--check] [--index] [--apply] [--no-add] [--index-info] [--allow-binary-replacement] [-z] [-pNUM] [-CNUM] [--whitespace=<nowarn|warn|error|error-all|strip>] <patch>...";
38
39 static enum whitespace_eol {
40 nowarn_whitespace,
41 warn_on_whitespace,
42 error_on_whitespace,
43 strip_whitespace,
44 } new_whitespace = warn_on_whitespace;
45 static int whitespace_error = 0;
46 static int squelch_whitespace_errors = 5;
47 static int applied_after_stripping = 0;
48 static const char *patch_input_file = NULL;
49
50 static void parse_whitespace_option(const char *option)
51 {
52 if (!option) {
53 new_whitespace = warn_on_whitespace;
54 return;
55 }
56 if (!strcmp(option, "warn")) {
57 new_whitespace = warn_on_whitespace;
58 return;
59 }
60 if (!strcmp(option, "nowarn")) {
61 new_whitespace = nowarn_whitespace;
62 return;
63 }
64 if (!strcmp(option, "error")) {
65 new_whitespace = error_on_whitespace;
66 return;
67 }
68 if (!strcmp(option, "error-all")) {
69 new_whitespace = error_on_whitespace;
70 squelch_whitespace_errors = 0;
71 return;
72 }
73 if (!strcmp(option, "strip")) {
74 new_whitespace = strip_whitespace;
75 return;
76 }
77 die("unrecognized whitespace option '%s'", option);
78 }
79
80 static void set_default_whitespace_mode(const char *whitespace_option)
81 {
82 if (!whitespace_option && !apply_default_whitespace) {
83 new_whitespace = (apply
84 ? warn_on_whitespace
85 : nowarn_whitespace);
86 }
87 }
88
89 /*
90 * For "diff-stat" like behaviour, we keep track of the biggest change
91 * we've seen, and the longest filename. That allows us to do simple
92 * scaling.
93 */
94 static int max_change, max_len;
95
96 /*
97 * Various "current state", notably line numbers and what
98 * file (and how) we're patching right now.. The "is_xxxx"
99 * things are flags, where -1 means "don't know yet".
100 */
101 static int linenr = 1;
102
103 struct fragment {
104 unsigned long leading, trailing;
105 unsigned long oldpos, oldlines;
106 unsigned long newpos, newlines;
107 const char *patch;
108 int size;
109 struct fragment *next;
110 };
111
112 struct patch {
113 char *new_name, *old_name, *def_name;
114 unsigned int old_mode, new_mode;
115 int is_rename, is_copy, is_new, is_delete, is_binary;
116 int lines_added, lines_deleted;
117 int score;
118 struct fragment *fragments;
119 char *result;
120 unsigned long resultsize;
121 char old_sha1_prefix[41];
122 char new_sha1_prefix[41];
123 struct patch *next;
124 };
125
126 #define CHUNKSIZE (8192)
127 #define SLOP (16)
128
129 static void *read_patch_file(int fd, unsigned long *sizep)
130 {
131 unsigned long size = 0, alloc = CHUNKSIZE;
132 void *buffer = xmalloc(alloc);
133
134 for (;;) {
135 int nr = alloc - size;
136 if (nr < 1024) {
137 alloc += CHUNKSIZE;
138 buffer = xrealloc(buffer, alloc);
139 nr = alloc - size;
140 }
141 nr = xread(fd, buffer + size, nr);
142 if (!nr)
143 break;
144 if (nr < 0)
145 die("git-apply: read returned %s", strerror(errno));
146 size += nr;
147 }
148 *sizep = size;
149
150 /*
151 * Make sure that we have some slop in the buffer
152 * so that we can do speculative "memcmp" etc, and
153 * see to it that it is NUL-filled.
154 */
155 if (alloc < size + SLOP)
156 buffer = xrealloc(buffer, size + SLOP);
157 memset(buffer + size, 0, SLOP);
158 return buffer;
159 }
160
161 static unsigned long linelen(const char *buffer, unsigned long size)
162 {
163 unsigned long len = 0;
164 while (size--) {
165 len++;
166 if (*buffer++ == '\n')
167 break;
168 }
169 return len;
170 }
171
172 static int is_dev_null(const char *str)
173 {
174 return !memcmp("/dev/null", str, 9) && isspace(str[9]);
175 }
176
177 #define TERM_SPACE 1
178 #define TERM_TAB 2
179
180 static int name_terminate(const char *name, int namelen, int c, int terminate)
181 {
182 if (c == ' ' && !(terminate & TERM_SPACE))
183 return 0;
184 if (c == '\t' && !(terminate & TERM_TAB))
185 return 0;
186
187 return 1;
188 }
189
190 static char * find_name(const char *line, char *def, int p_value, int terminate)
191 {
192 int len;
193 const char *start = line;
194 char *name;
195
196 if (*line == '"') {
197 /* Proposed "new-style" GNU patch/diff format; see
198 * http://marc.theaimsgroup.com/?l=git&m=112927316408690&w=2
199 */
200 name = unquote_c_style(line, NULL);
201 if (name) {
202 char *cp = name;
203 while (p_value) {
204 cp = strchr(name, '/');
205 if (!cp)
206 break;
207 cp++;
208 p_value--;
209 }
210 if (cp) {
211 /* name can later be freed, so we need
212 * to memmove, not just return cp
213 */
214 memmove(name, cp, strlen(cp) + 1);
215 free(def);
216 return name;
217 }
218 else {
219 free(name);
220 name = NULL;
221 }
222 }
223 }
224
225 for (;;) {
226 char c = *line;
227
228 if (isspace(c)) {
229 if (c == '\n')
230 break;
231 if (name_terminate(start, line-start, c, terminate))
232 break;
233 }
234 line++;
235 if (c == '/' && !--p_value)
236 start = line;
237 }
238 if (!start)
239 return def;
240 len = line - start;
241 if (!len)
242 return def;
243
244 /*
245 * Generally we prefer the shorter name, especially
246 * if the other one is just a variation of that with
247 * something else tacked on to the end (ie "file.orig"
248 * or "file~").
249 */
250 if (def) {
251 int deflen = strlen(def);
252 if (deflen < len && !strncmp(start, def, deflen))
253 return def;
254 }
255
256 name = xmalloc(len + 1);
257 memcpy(name, start, len);
258 name[len] = 0;
259 free(def);
260 return name;
261 }
262
263 /*
264 * Get the name etc info from the --/+++ lines of a traditional patch header
265 *
266 * NOTE! This hardcodes "-p1" behaviour in filename detection.
267 *
268 * FIXME! The end-of-filename heuristics are kind of screwy. For existing
269 * files, we can happily check the index for a match, but for creating a
270 * new file we should try to match whatever "patch" does. I have no idea.
271 */
272 static void parse_traditional_patch(const char *first, const char *second, struct patch *patch)
273 {
274 char *name;
275
276 first += 4; // skip "--- "
277 second += 4; // skip "+++ "
278 if (is_dev_null(first)) {
279 patch->is_new = 1;
280 patch->is_delete = 0;
281 name = find_name(second, NULL, p_value, TERM_SPACE | TERM_TAB);
282 patch->new_name = name;
283 } else if (is_dev_null(second)) {
284 patch->is_new = 0;
285 patch->is_delete = 1;
286 name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB);
287 patch->old_name = name;
288 } else {
289 name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB);
290 name = find_name(second, name, p_value, TERM_SPACE | TERM_TAB);
291 patch->old_name = patch->new_name = name;
292 }
293 if (!name)
294 die("unable to find filename in patch at line %d", linenr);
295 }
296
297 static int gitdiff_hdrend(const char *line, struct patch *patch)
298 {
299 return -1;
300 }
301
302 /*
303 * We're anal about diff header consistency, to make
304 * sure that we don't end up having strange ambiguous
305 * patches floating around.
306 *
307 * As a result, gitdiff_{old|new}name() will check
308 * their names against any previous information, just
309 * to make sure..
310 */
311 static char *gitdiff_verify_name(const char *line, int isnull, char *orig_name, const char *oldnew)
312 {
313 if (!orig_name && !isnull)
314 return find_name(line, NULL, 1, 0);
315
316 if (orig_name) {
317 int len;
318 const char *name;
319 char *another;
320 name = orig_name;
321 len = strlen(name);
322 if (isnull)
323 die("git-apply: bad git-diff - expected /dev/null, got %s on line %d", name, linenr);
324 another = find_name(line, NULL, 1, 0);
325 if (!another || memcmp(another, name, len))
326 die("git-apply: bad git-diff - inconsistent %s filename on line %d", oldnew, linenr);
327 free(another);
328 return orig_name;
329 }
330 else {
331 /* expect "/dev/null" */
332 if (memcmp("/dev/null", line, 9) || line[9] != '\n')
333 die("git-apply: bad git-diff - expected /dev/null on line %d", linenr);
334 return NULL;
335 }
336 }
337
338 static int gitdiff_oldname(const char *line, struct patch *patch)
339 {
340 patch->old_name = gitdiff_verify_name(line, patch->is_new, patch->old_name, "old");
341 return 0;
342 }
343
344 static int gitdiff_newname(const char *line, struct patch *patch)
345 {
346 patch->new_name = gitdiff_verify_name(line, patch->is_delete, patch->new_name, "new");
347 return 0;
348 }
349
350 static int gitdiff_oldmode(const char *line, struct patch *patch)
351 {
352 patch->old_mode = strtoul(line, NULL, 8);
353 return 0;
354 }
355
356 static int gitdiff_newmode(const char *line, struct patch *patch)
357 {
358 patch->new_mode = strtoul(line, NULL, 8);
359 return 0;
360 }
361
362 static int gitdiff_delete(const char *line, struct patch *patch)
363 {
364 patch->is_delete = 1;
365 patch->old_name = patch->def_name;
366 return gitdiff_oldmode(line, patch);
367 }
368
369 static int gitdiff_newfile(const char *line, struct patch *patch)
370 {
371 patch->is_new = 1;
372 patch->new_name = patch->def_name;
373 return gitdiff_newmode(line, patch);
374 }
375
376 static int gitdiff_copysrc(const char *line, struct patch *patch)
377 {
378 patch->is_copy = 1;
379 patch->old_name = find_name(line, NULL, 0, 0);
380 return 0;
381 }
382
383 static int gitdiff_copydst(const char *line, struct patch *patch)
384 {
385 patch->is_copy = 1;
386 patch->new_name = find_name(line, NULL, 0, 0);
387 return 0;
388 }
389
390 static int gitdiff_renamesrc(const char *line, struct patch *patch)
391 {
392 patch->is_rename = 1;
393 patch->old_name = find_name(line, NULL, 0, 0);
394 return 0;
395 }
396
397 static int gitdiff_renamedst(const char *line, struct patch *patch)
398 {
399 patch->is_rename = 1;
400 patch->new_name = find_name(line, NULL, 0, 0);
401 return 0;
402 }
403
404 static int gitdiff_similarity(const char *line, struct patch *patch)
405 {
406 if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
407 patch->score = 0;
408 return 0;
409 }
410
411 static int gitdiff_dissimilarity(const char *line, struct patch *patch)
412 {
413 if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
414 patch->score = 0;
415 return 0;
416 }
417
418 static int gitdiff_index(const char *line, struct patch *patch)
419 {
420 /* index line is N hexadecimal, "..", N hexadecimal,
421 * and optional space with octal mode.
422 */
423 const char *ptr, *eol;
424 int len;
425
426 ptr = strchr(line, '.');
427 if (!ptr || ptr[1] != '.' || 40 < ptr - line)
428 return 0;
429 len = ptr - line;
430 memcpy(patch->old_sha1_prefix, line, len);
431 patch->old_sha1_prefix[len] = 0;
432
433 line = ptr + 2;
434 ptr = strchr(line, ' ');
435 eol = strchr(line, '\n');
436
437 if (!ptr || eol < ptr)
438 ptr = eol;
439 len = ptr - line;
440
441 if (40 < len)
442 return 0;
443 memcpy(patch->new_sha1_prefix, line, len);
444 patch->new_sha1_prefix[len] = 0;
445 if (*ptr == ' ')
446 patch->new_mode = patch->old_mode = strtoul(ptr+1, NULL, 8);
447 return 0;
448 }
449
450 /*
451 * This is normal for a diff that doesn't change anything: we'll fall through
452 * into the next diff. Tell the parser to break out.
453 */
454 static int gitdiff_unrecognized(const char *line, struct patch *patch)
455 {
456 return -1;
457 }
458
459 static const char *stop_at_slash(const char *line, int llen)
460 {
461 int i;
462
463 for (i = 0; i < llen; i++) {
464 int ch = line[i];
465 if (ch == '/')
466 return line + i;
467 }
468 return NULL;
469 }
470
471 /* This is to extract the same name that appears on "diff --git"
472 * line. We do not find and return anything if it is a rename
473 * patch, and it is OK because we will find the name elsewhere.
474 * We need to reliably find name only when it is mode-change only,
475 * creation or deletion of an empty file. In any of these cases,
476 * both sides are the same name under a/ and b/ respectively.
477 */
478 static char *git_header_name(char *line, int llen)
479 {
480 int len;
481 const char *name;
482 const char *second = NULL;
483
484 line += strlen("diff --git ");
485 llen -= strlen("diff --git ");
486
487 if (*line == '"') {
488 const char *cp;
489 char *first = unquote_c_style(line, &second);
490 if (!first)
491 return NULL;
492
493 /* advance to the first slash */
494 cp = stop_at_slash(first, strlen(first));
495 if (!cp || cp == first) {
496 /* we do not accept absolute paths */
497 free_first_and_fail:
498 free(first);
499 return NULL;
500 }
501 len = strlen(cp+1);
502 memmove(first, cp+1, len+1); /* including NUL */
503
504 /* second points at one past closing dq of name.
505 * find the second name.
506 */
507 while ((second < line + llen) && isspace(*second))
508 second++;
509
510 if (line + llen <= second)
511 goto free_first_and_fail;
512 if (*second == '"') {
513 char *sp = unquote_c_style(second, NULL);
514 if (!sp)
515 goto free_first_and_fail;
516 cp = stop_at_slash(sp, strlen(sp));
517 if (!cp || cp == sp) {
518 free_both_and_fail:
519 free(sp);
520 goto free_first_and_fail;
521 }
522 /* They must match, otherwise ignore */
523 if (strcmp(cp+1, first))
524 goto free_both_and_fail;
525 free(sp);
526 return first;
527 }
528
529 /* unquoted second */
530 cp = stop_at_slash(second, line + llen - second);
531 if (!cp || cp == second)
532 goto free_first_and_fail;
533 cp++;
534 if (line + llen - cp != len + 1 ||
535 memcmp(first, cp, len))
536 goto free_first_and_fail;
537 return first;
538 }
539
540 /* unquoted first name */
541 name = stop_at_slash(line, llen);
542 if (!name || name == line)
543 return NULL;
544
545 name++;
546
547 /* since the first name is unquoted, a dq if exists must be
548 * the beginning of the second name.
549 */
550 for (second = name; second < line + llen; second++) {
551 if (*second == '"') {
552 const char *cp = second;
553 const char *np;
554 char *sp = unquote_c_style(second, NULL);
555
556 if (!sp)
557 return NULL;
558 np = stop_at_slash(sp, strlen(sp));
559 if (!np || np == sp) {
560 free_second_and_fail:
561 free(sp);
562 return NULL;
563 }
564 np++;
565 len = strlen(np);
566 if (len < cp - name &&
567 !strncmp(np, name, len) &&
568 isspace(name[len])) {
569 /* Good */
570 memmove(sp, np, len + 1);
571 return sp;
572 }
573 goto free_second_and_fail;
574 }
575 }
576
577 /*
578 * Accept a name only if it shows up twice, exactly the same
579 * form.
580 */
581 for (len = 0 ; ; len++) {
582 char c = name[len];
583
584 switch (c) {
585 default:
586 continue;
587 case '\n':
588 return NULL;
589 case '\t': case ' ':
590 second = name+len;
591 for (;;) {
592 char c = *second++;
593 if (c == '\n')
594 return NULL;
595 if (c == '/')
596 break;
597 }
598 if (second[len] == '\n' && !memcmp(name, second, len)) {
599 char *ret = xmalloc(len + 1);
600 memcpy(ret, name, len);
601 ret[len] = 0;
602 return ret;
603 }
604 }
605 }
606 return NULL;
607 }
608
609 /* Verify that we recognize the lines following a git header */
610 static int parse_git_header(char *line, int len, unsigned int size, struct patch *patch)
611 {
612 unsigned long offset;
613
614 /* A git diff has explicit new/delete information, so we don't guess */
615 patch->is_new = 0;
616 patch->is_delete = 0;
617
618 /*
619 * Some things may not have the old name in the
620 * rest of the headers anywhere (pure mode changes,
621 * or removing or adding empty files), so we get
622 * the default name from the header.
623 */
624 patch->def_name = git_header_name(line, len);
625
626 line += len;
627 size -= len;
628 linenr++;
629 for (offset = len ; size > 0 ; offset += len, size -= len, line += len, linenr++) {
630 static const struct opentry {
631 const char *str;
632 int (*fn)(const char *, struct patch *);
633 } optable[] = {
634 { "@@ -", gitdiff_hdrend },
635 { "--- ", gitdiff_oldname },
636 { "+++ ", gitdiff_newname },
637 { "old mode ", gitdiff_oldmode },
638 { "new mode ", gitdiff_newmode },
639 { "deleted file mode ", gitdiff_delete },
640 { "new file mode ", gitdiff_newfile },
641 { "copy from ", gitdiff_copysrc },
642 { "copy to ", gitdiff_copydst },
643 { "rename old ", gitdiff_renamesrc },
644 { "rename new ", gitdiff_renamedst },
645 { "rename from ", gitdiff_renamesrc },
646 { "rename to ", gitdiff_renamedst },
647 { "similarity index ", gitdiff_similarity },
648 { "dissimilarity index ", gitdiff_dissimilarity },
649 { "index ", gitdiff_index },
650 { "", gitdiff_unrecognized },
651 };
652 int i;
653
654 len = linelen(line, size);
655 if (!len || line[len-1] != '\n')
656 break;
657 for (i = 0; i < ARRAY_SIZE(optable); i++) {
658 const struct opentry *p = optable + i;
659 int oplen = strlen(p->str);
660 if (len < oplen || memcmp(p->str, line, oplen))
661 continue;
662 if (p->fn(line + oplen, patch) < 0)
663 return offset;
664 break;
665 }
666 }
667
668 return offset;
669 }
670
671 static int parse_num(const char *line, unsigned long *p)
672 {
673 char *ptr;
674
675 if (!isdigit(*line))
676 return 0;
677 *p = strtoul(line, &ptr, 10);
678 return ptr - line;
679 }
680
681 static int parse_range(const char *line, int len, int offset, const char *expect,
682 unsigned long *p1, unsigned long *p2)
683 {
684 int digits, ex;
685
686 if (offset < 0 || offset >= len)
687 return -1;
688 line += offset;
689 len -= offset;
690
691 digits = parse_num(line, p1);
692 if (!digits)
693 return -1;
694
695 offset += digits;
696 line += digits;
697 len -= digits;
698
699 *p2 = 1;
700 if (*line == ',') {
701 digits = parse_num(line+1, p2);
702 if (!digits)
703 return -1;
704
705 offset += digits+1;
706 line += digits+1;
707 len -= digits+1;
708 }
709
710 ex = strlen(expect);
711 if (ex > len)
712 return -1;
713 if (memcmp(line, expect, ex))
714 return -1;
715
716 return offset + ex;
717 }
718
719 /*
720 * Parse a unified diff fragment header of the
721 * form "@@ -a,b +c,d @@"
722 */
723 static int parse_fragment_header(char *line, int len, struct fragment *fragment)
724 {
725 int offset;
726
727 if (!len || line[len-1] != '\n')
728 return -1;
729
730 /* Figure out the number of lines in a fragment */
731 offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines);
732 offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines);
733
734 return offset;
735 }
736
737 static int find_header(char *line, unsigned long size, int *hdrsize, struct patch *patch)
738 {
739 unsigned long offset, len;
740
741 patch->is_rename = patch->is_copy = 0;
742 patch->is_new = patch->is_delete = -1;
743 patch->old_mode = patch->new_mode = 0;
744 patch->old_name = patch->new_name = NULL;
745 for (offset = 0; size > 0; offset += len, size -= len, line += len, linenr++) {
746 unsigned long nextlen;
747
748 len = linelen(line, size);
749 if (!len)
750 break;
751
752 /* Testing this early allows us to take a few shortcuts.. */
753 if (len < 6)
754 continue;
755
756 /*
757 * Make sure we don't find any unconnected patch fragmants.
758 * That's a sign that we didn't find a header, and that a
759 * patch has become corrupted/broken up.
760 */
761 if (!memcmp("@@ -", line, 4)) {
762 struct fragment dummy;
763 if (parse_fragment_header(line, len, &dummy) < 0)
764 continue;
765 error("patch fragment without header at line %d: %.*s", linenr, (int)len-1, line);
766 }
767
768 if (size < len + 6)
769 break;
770
771 /*
772 * Git patch? It might not have a real patch, just a rename
773 * or mode change, so we handle that specially
774 */
775 if (!memcmp("diff --git ", line, 11)) {
776 int git_hdr_len = parse_git_header(line, len, size, patch);
777 if (git_hdr_len <= len)
778 continue;
779 if (!patch->old_name && !patch->new_name) {
780 if (!patch->def_name)
781 die("git diff header lacks filename information (line %d)", linenr);
782 patch->old_name = patch->new_name = patch->def_name;
783 }
784 *hdrsize = git_hdr_len;
785 return offset;
786 }
787
788 /** --- followed by +++ ? */
789 if (memcmp("--- ", line, 4) || memcmp("+++ ", line + len, 4))
790 continue;
791
792 /*
793 * We only accept unified patches, so we want it to
794 * at least have "@@ -a,b +c,d @@\n", which is 14 chars
795 * minimum
796 */
797 nextlen = linelen(line + len, size - len);
798 if (size < nextlen + 14 || memcmp("@@ -", line + len + nextlen, 4))
799 continue;
800
801 /* Ok, we'll consider it a patch */
802 parse_traditional_patch(line, line+len, patch);
803 *hdrsize = len + nextlen;
804 linenr += 2;
805 return offset;
806 }
807 return -1;
808 }
809
810 /*
811 * Parse a unified diff. Note that this really needs
812 * to parse each fragment separately, since the only
813 * way to know the difference between a "---" that is
814 * part of a patch, and a "---" that starts the next
815 * patch is to look at the line counts..
816 */
817 static int parse_fragment(char *line, unsigned long size, struct patch *patch, struct fragment *fragment)
818 {
819 int added, deleted;
820 int len = linelen(line, size), offset;
821 unsigned long oldlines, newlines;
822 unsigned long leading, trailing;
823
824 offset = parse_fragment_header(line, len, fragment);
825 if (offset < 0)
826 return -1;
827 oldlines = fragment->oldlines;
828 newlines = fragment->newlines;
829 leading = 0;
830 trailing = 0;
831
832 if (patch->is_new < 0) {
833 patch->is_new = !oldlines;
834 if (!oldlines)
835 patch->old_name = NULL;
836 }
837 if (patch->is_delete < 0) {
838 patch->is_delete = !newlines;
839 if (!newlines)
840 patch->new_name = NULL;
841 }
842
843 if (patch->is_new && oldlines)
844 return error("new file depends on old contents");
845 if (patch->is_delete != !newlines) {
846 if (newlines)
847 return error("deleted file still has contents");
848 fprintf(stderr, "** warning: file %s becomes empty but is not deleted\n", patch->new_name);
849 }
850
851 /* Parse the thing.. */
852 line += len;
853 size -= len;
854 linenr++;
855 added = deleted = 0;
856 for (offset = len; size > 0; offset += len, size -= len, line += len, linenr++) {
857 if (!oldlines && !newlines)
858 break;
859 len = linelen(line, size);
860 if (!len || line[len-1] != '\n')
861 return -1;
862 switch (*line) {
863 default:
864 return -1;
865 case ' ':
866 oldlines--;
867 newlines--;
868 if (!deleted && !added)
869 leading++;
870 trailing++;
871 break;
872 case '-':
873 deleted++;
874 oldlines--;
875 trailing = 0;
876 break;
877 case '+':
878 /*
879 * We know len is at least two, since we have a '+' and
880 * we checked that the last character was a '\n' above.
881 * That is, an addition of an empty line would check
882 * the '+' here. Sneaky...
883 */
884 if ((new_whitespace != nowarn_whitespace) &&
885 isspace(line[len-2])) {
886 whitespace_error++;
887 if (squelch_whitespace_errors &&
888 squelch_whitespace_errors <
889 whitespace_error)
890 ;
891 else {
892 fprintf(stderr, "Adds trailing whitespace.\n%s:%d:%.*s\n",
893 patch_input_file,
894 linenr, len-2, line+1);
895 }
896 }
897 added++;
898 newlines--;
899 trailing = 0;
900 break;
901
902 /* We allow "\ No newline at end of file". Depending
903 * on locale settings when the patch was produced we
904 * don't know what this line looks like. The only
905 * thing we do know is that it begins with "\ ".
906 * Checking for 12 is just for sanity check -- any
907 * l10n of "\ No newline..." is at least that long.
908 */
909 case '\\':
910 if (len < 12 || memcmp(line, "\\ ", 2))
911 return -1;
912 break;
913 }
914 }
915 if (oldlines || newlines)
916 return -1;
917 fragment->leading = leading;
918 fragment->trailing = trailing;
919
920 /* If a fragment ends with an incomplete line, we failed to include
921 * it in the above loop because we hit oldlines == newlines == 0
922 * before seeing it.
923 */
924 if (12 < size && !memcmp(line, "\\ ", 2))
925 offset += linelen(line, size);
926
927 patch->lines_added += added;
928 patch->lines_deleted += deleted;
929 return offset;
930 }
931
932 static int parse_single_patch(char *line, unsigned long size, struct patch *patch)
933 {
934 unsigned long offset = 0;
935 struct fragment **fragp = &patch->fragments;
936
937 while (size > 4 && !memcmp(line, "@@ -", 4)) {
938 struct fragment *fragment;
939 int len;
940
941 fragment = xcalloc(1, sizeof(*fragment));
942 len = parse_fragment(line, size, patch, fragment);
943 if (len <= 0)
944 die("corrupt patch at line %d", linenr);
945
946 fragment->patch = line;
947 fragment->size = len;
948
949 *fragp = fragment;
950 fragp = &fragment->next;
951
952 offset += len;
953 line += len;
954 size -= len;
955 }
956 return offset;
957 }
958
959 static inline int metadata_changes(struct patch *patch)
960 {
961 return patch->is_rename > 0 ||
962 patch->is_copy > 0 ||
963 patch->is_new > 0 ||
964 patch->is_delete ||
965 (patch->old_mode && patch->new_mode &&
966 patch->old_mode != patch->new_mode);
967 }
968
969 static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
970 {
971 int hdrsize, patchsize;
972 int offset = find_header(buffer, size, &hdrsize, patch);
973
974 if (offset < 0)
975 return offset;
976
977 patchsize = parse_single_patch(buffer + offset + hdrsize, size - offset - hdrsize, patch);
978
979 if (!patchsize) {
980 static const char *binhdr[] = {
981 "Binary files ",
982 "Files ",
983 NULL,
984 };
985 int i;
986 int hd = hdrsize + offset;
987 unsigned long llen = linelen(buffer + hd, size - hd);
988
989 if (!memcmp(" differ\n", buffer + hd + llen - 8, 8))
990 for (i = 0; binhdr[i]; i++) {
991 int len = strlen(binhdr[i]);
992 if (len < size - hd &&
993 !memcmp(binhdr[i], buffer + hd, len)) {
994 patch->is_binary = 1;
995 break;
996 }
997 }
998
999 /* Empty patch cannot be applied if:
1000 * - it is a binary patch and we do not do binary_replace, or
1001 * - text patch without metadata change
1002 */
1003 if ((apply || check) &&
1004 (patch->is_binary
1005 ? !allow_binary_replacement
1006 : !metadata_changes(patch)))
1007 die("patch with only garbage at line %d", linenr);
1008 }
1009
1010 return offset + hdrsize + patchsize;
1011 }
1012
1013 static const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
1014 static const char minuses[]= "----------------------------------------------------------------------";
1015
1016 static void show_stats(struct patch *patch)
1017 {
1018 const char *prefix = "";
1019 char *name = patch->new_name;
1020 char *qname = NULL;
1021 int len, max, add, del, total;
1022
1023 if (!name)
1024 name = patch->old_name;
1025
1026 if (0 < (len = quote_c_style(name, NULL, NULL, 0))) {
1027 qname = xmalloc(len + 1);
1028 quote_c_style(name, qname, NULL, 0);
1029 name = qname;
1030 }
1031
1032 /*
1033 * "scale" the filename
1034 */
1035 len = strlen(name);
1036 max = max_len;
1037 if (max > 50)
1038 max = 50;
1039 if (len > max) {
1040 char *slash;
1041 prefix = "...";
1042 max -= 3;
1043 name += len - max;
1044 slash = strchr(name, '/');
1045 if (slash)
1046 name = slash;
1047 }
1048 len = max;
1049
1050 /*
1051 * scale the add/delete
1052 */
1053 max = max_change;
1054 if (max + len > 70)
1055 max = 70 - len;
1056
1057 add = patch->lines_added;
1058 del = patch->lines_deleted;
1059 total = add + del;
1060
1061 if (max_change > 0) {
1062 total = (total * max + max_change / 2) / max_change;
1063 add = (add * max + max_change / 2) / max_change;
1064 del = total - add;
1065 }
1066 if (patch->is_binary)
1067 printf(" %s%-*s | Bin\n", prefix, len, name);
1068 else
1069 printf(" %s%-*s |%5d %.*s%.*s\n", prefix,
1070 len, name, patch->lines_added + patch->lines_deleted,
1071 add, pluses, del, minuses);
1072 if (qname)
1073 free(qname);
1074 }
1075
1076 static int read_old_data(struct stat *st, const char *path, void *buf, unsigned long size)
1077 {
1078 int fd;
1079 unsigned long got;
1080
1081 switch (st->st_mode & S_IFMT) {
1082 case S_IFLNK:
1083 return readlink(path, buf, size);
1084 case S_IFREG:
1085 fd = open(path, O_RDONLY);
1086 if (fd < 0)
1087 return error("unable to open %s", path);
1088 got = 0;
1089 for (;;) {
1090 int ret = xread(fd, buf + got, size - got);
1091 if (ret <= 0)
1092 break;
1093 got += ret;
1094 }
1095 close(fd);
1096 return got;
1097
1098 default:
1099 return -1;
1100 }
1101 }
1102
1103 static int find_offset(const char *buf, unsigned long size, const char *fragment, unsigned long fragsize, int line, int *lines)
1104 {
1105 int i;
1106 unsigned long start, backwards, forwards;
1107
1108 if (fragsize > size)
1109 return -1;
1110
1111 start = 0;
1112 if (line > 1) {
1113 unsigned long offset = 0;
1114 i = line-1;
1115 while (offset + fragsize <= size) {
1116 if (buf[offset++] == '\n') {
1117 start = offset;
1118 if (!--i)
1119 break;
1120 }
1121 }
1122 }
1123
1124 /* Exact line number? */
1125 if (!memcmp(buf + start, fragment, fragsize))
1126 return start;
1127
1128 /*
1129 * There's probably some smart way to do this, but I'll leave
1130 * that to the smart and beautiful people. I'm simple and stupid.
1131 */
1132 backwards = start;
1133 forwards = start;
1134 for (i = 0; ; i++) {
1135 unsigned long try;
1136 int n;
1137
1138 /* "backward" */
1139 if (i & 1) {
1140 if (!backwards) {
1141 if (forwards + fragsize > size)
1142 break;
1143 continue;
1144 }
1145 do {
1146 --backwards;
1147 } while (backwards && buf[backwards-1] != '\n');
1148 try = backwards;
1149 } else {
1150 while (forwards + fragsize <= size) {
1151 if (buf[forwards++] == '\n')
1152 break;
1153 }
1154 try = forwards;
1155 }
1156
1157 if (try + fragsize > size)
1158 continue;
1159 if (memcmp(buf + try, fragment, fragsize))
1160 continue;
1161 n = (i >> 1)+1;
1162 if (i & 1)
1163 n = -n;
1164 *lines = n;
1165 return try;
1166 }
1167
1168 /*
1169 * We should start searching forward and backward.
1170 */
1171 return -1;
1172 }
1173
1174 static void remove_first_line(const char **rbuf, int *rsize)
1175 {
1176 const char *buf = *rbuf;
1177 int size = *rsize;
1178 unsigned long offset;
1179 offset = 0;
1180 while (offset <= size) {
1181 if (buf[offset++] == '\n')
1182 break;
1183 }
1184 *rsize = size - offset;
1185 *rbuf = buf + offset;
1186 }
1187
1188 static void remove_last_line(const char **rbuf, int *rsize)
1189 {
1190 const char *buf = *rbuf;
1191 int size = *rsize;
1192 unsigned long offset;
1193 offset = size - 1;
1194 while (offset > 0) {
1195 if (buf[--offset] == '\n')
1196 break;
1197 }
1198 *rsize = offset + 1;
1199 }
1200
1201 struct buffer_desc {
1202 char *buffer;
1203 unsigned long size;
1204 unsigned long alloc;
1205 };
1206
1207 static int apply_line(char *output, const char *patch, int plen)
1208 {
1209 /* plen is number of bytes to be copied from patch,
1210 * starting at patch+1 (patch[0] is '+'). Typically
1211 * patch[plen] is '\n'.
1212 */
1213 int add_nl_to_tail = 0;
1214 if ((new_whitespace == strip_whitespace) &&
1215 1 < plen && isspace(patch[plen-1])) {
1216 if (patch[plen] == '\n')
1217 add_nl_to_tail = 1;
1218 plen--;
1219 while (0 < plen && isspace(patch[plen]))
1220 plen--;
1221 applied_after_stripping++;
1222 }
1223 memcpy(output, patch + 1, plen);
1224 if (add_nl_to_tail)
1225 output[plen++] = '\n';
1226 return plen;
1227 }
1228
1229 static int apply_one_fragment(struct buffer_desc *desc, struct fragment *frag)
1230 {
1231 char *buf = desc->buffer;
1232 const char *patch = frag->patch;
1233 int offset, size = frag->size;
1234 char *old = xmalloc(size);
1235 char *new = xmalloc(size);
1236 const char *oldlines, *newlines;
1237 int oldsize = 0, newsize = 0;
1238 unsigned long leading, trailing;
1239 int pos, lines;
1240
1241 while (size > 0) {
1242 int len = linelen(patch, size);
1243 int plen;
1244
1245 if (!len)
1246 break;
1247
1248 /*
1249 * "plen" is how much of the line we should use for
1250 * the actual patch data. Normally we just remove the
1251 * first character on the line, but if the line is
1252 * followed by "\ No newline", then we also remove the
1253 * last one (which is the newline, of course).
1254 */
1255 plen = len-1;
1256 if (len < size && patch[len] == '\\')
1257 plen--;
1258 switch (*patch) {
1259 case ' ':
1260 case '-':
1261 memcpy(old + oldsize, patch + 1, plen);
1262 oldsize += plen;
1263 if (*patch == '-')
1264 break;
1265 /* Fall-through for ' ' */
1266 case '+':
1267 if (*patch != '+' || !no_add)
1268 newsize += apply_line(new + newsize, patch,
1269 plen);
1270 break;
1271 case '@': case '\\':
1272 /* Ignore it, we already handled it */
1273 break;
1274 default:
1275 return -1;
1276 }
1277 patch += len;
1278 size -= len;
1279 }
1280
1281 #ifdef NO_ACCURATE_DIFF
1282 if (oldsize > 0 && old[oldsize - 1] == '\n' &&
1283 newsize > 0 && new[newsize - 1] == '\n') {
1284 oldsize--;
1285 newsize--;
1286 }
1287 #endif
1288
1289 oldlines = old;
1290 newlines = new;
1291 leading = frag->leading;
1292 trailing = frag->trailing;
1293 lines = 0;
1294 pos = frag->newpos;
1295 for (;;) {
1296 offset = find_offset(buf, desc->size, oldlines, oldsize, pos, &lines);
1297 if (offset >= 0) {
1298 int diff = newsize - oldsize;
1299 unsigned long size = desc->size + diff;
1300 unsigned long alloc = desc->alloc;
1301
1302 /* Warn if it was necessary to reduce the number
1303 * of context lines.
1304 */
1305 if ((leading != frag->leading) || (trailing != frag->trailing))
1306 fprintf(stderr, "Context reduced to (%ld/%ld) to apply fragment at %d\n",
1307 leading, trailing, pos + lines);
1308
1309 if (size > alloc) {
1310 alloc = size + 8192;
1311 desc->alloc = alloc;
1312 buf = xrealloc(buf, alloc);
1313 desc->buffer = buf;
1314 }
1315 desc->size = size;
1316 memmove(buf + offset + newsize, buf + offset + oldsize, size - offset - newsize);
1317 memcpy(buf + offset, newlines, newsize);
1318 offset = 0;
1319
1320 break;
1321 }
1322
1323 /* Am I at my context limits? */
1324 if ((leading <= p_context) && (trailing <= p_context))
1325 break;
1326 /* Reduce the number of context lines
1327 * Reduce both leading and trailing if they are equal
1328 * otherwise just reduce the larger context.
1329 */
1330 if (leading >= trailing) {
1331 remove_first_line(&oldlines, &oldsize);
1332 remove_first_line(&newlines, &newsize);
1333 pos--;
1334 leading--;
1335 }
1336 if (trailing > leading) {
1337 remove_last_line(&oldlines, &oldsize);
1338 remove_last_line(&newlines, &newsize);
1339 trailing--;
1340 }
1341 }
1342
1343 free(old);
1344 free(new);
1345 return offset;
1346 }
1347
1348 static int apply_fragments(struct buffer_desc *desc, struct patch *patch)
1349 {
1350 struct fragment *frag = patch->fragments;
1351 const char *name = patch->old_name ? patch->old_name : patch->new_name;
1352
1353 if (patch->is_binary) {
1354 unsigned char sha1[20];
1355
1356 if (!allow_binary_replacement)
1357 return error("cannot apply binary patch to '%s' "
1358 "without --allow-binary-replacement",
1359 name);
1360
1361 /* For safety, we require patch index line to contain
1362 * full 40-byte textual SHA1 for old and new, at least for now.
1363 */
1364 if (strlen(patch->old_sha1_prefix) != 40 ||
1365 strlen(patch->new_sha1_prefix) != 40 ||
1366 get_sha1_hex(patch->old_sha1_prefix, sha1) ||
1367 get_sha1_hex(patch->new_sha1_prefix, sha1))
1368 return error("cannot apply binary patch to '%s' "
1369 "without full index line", name);
1370
1371 if (patch->old_name) {
1372 unsigned char hdr[50];
1373 int hdrlen;
1374
1375 /* See if the old one matches what the patch
1376 * applies to.
1377 */
1378 write_sha1_file_prepare(desc->buffer, desc->size,
1379 blob_type, sha1, hdr, &hdrlen);
1380 if (strcmp(sha1_to_hex(sha1), patch->old_sha1_prefix))
1381 return error("the patch applies to '%s' (%s), "
1382 "which does not match the "
1383 "current contents.",
1384 name, sha1_to_hex(sha1));
1385 }
1386 else {
1387 /* Otherwise, the old one must be empty. */
1388 if (desc->size)
1389 return error("the patch applies to an empty "
1390 "'%s' but it is not empty", name);
1391 }
1392
1393 /* For now, we do not record post-image data in the patch,
1394 * and require the object already present in the recipient's
1395 * object database.
1396 */
1397 if (desc->buffer) {
1398 free(desc->buffer);
1399 desc->alloc = desc->size = 0;
1400 }
1401 get_sha1_hex(patch->new_sha1_prefix, sha1);
1402
1403 if (memcmp(sha1, null_sha1, 20)) {
1404 char type[10];
1405 unsigned long size;
1406
1407 desc->buffer = read_sha1_file(sha1, type, &size);
1408 if (!desc->buffer)
1409 return error("the necessary postimage %s for "
1410 "'%s' does not exist",
1411 patch->new_sha1_prefix, name);
1412 desc->alloc = desc->size = size;
1413 }
1414
1415 return 0;
1416 }
1417
1418 while (frag) {
1419 if (apply_one_fragment(desc, frag) < 0)
1420 return error("patch failed: %s:%ld",
1421 name, frag->oldpos);
1422 frag = frag->next;
1423 }
1424 return 0;
1425 }
1426
1427 static int apply_data(struct patch *patch, struct stat *st)
1428 {
1429 char *buf;
1430 unsigned long size, alloc;
1431 struct buffer_desc desc;
1432
1433 size = 0;
1434 alloc = 0;
1435 buf = NULL;
1436 if (patch->old_name) {
1437 size = st->st_size;
1438 alloc = size + 8192;
1439 buf = xmalloc(alloc);
1440 if (read_old_data(st, patch->old_name, buf, alloc) != size)
1441 return error("read of %s failed", patch->old_name);
1442 }
1443
1444 desc.size = size;
1445 desc.alloc = alloc;
1446 desc.buffer = buf;
1447 if (apply_fragments(&desc, patch) < 0)
1448 return -1;
1449 patch->result = desc.buffer;
1450 patch->resultsize = desc.size;
1451
1452 if (patch->is_delete && patch->resultsize)
1453 return error("removal patch leaves file contents");
1454
1455 return 0;
1456 }
1457
1458 static int check_patch(struct patch *patch)
1459 {
1460 struct stat st;
1461 const char *old_name = patch->old_name;
1462 const char *new_name = patch->new_name;
1463 const char *name = old_name ? old_name : new_name;
1464
1465 if (old_name) {
1466 int changed;
1467 int stat_ret = lstat(old_name, &st);
1468
1469 if (check_index) {
1470 int pos = cache_name_pos(old_name, strlen(old_name));
1471 if (pos < 0)
1472 return error("%s: does not exist in index",
1473 old_name);
1474 if (stat_ret < 0) {
1475 struct checkout costate;
1476 if (errno != ENOENT)
1477 return error("%s: %s", old_name,
1478 strerror(errno));
1479 /* checkout */
1480 costate.base_dir = "";
1481 costate.base_dir_len = 0;
1482 costate.force = 0;
1483 costate.quiet = 0;
1484 costate.not_new = 0;
1485 costate.refresh_cache = 1;
1486 if (checkout_entry(active_cache[pos],
1487 &costate,
1488 NULL) ||
1489 lstat(old_name, &st))
1490 return -1;
1491 }
1492
1493 changed = ce_match_stat(active_cache[pos], &st, 1);
1494 if (changed)
1495 return error("%s: does not match index",
1496 old_name);
1497 }
1498 else if (stat_ret < 0)
1499 return error("%s: %s", old_name, strerror(errno));
1500
1501 if (patch->is_new < 0)
1502 patch->is_new = 0;
1503 st.st_mode = ntohl(create_ce_mode(st.st_mode));
1504 if (!patch->old_mode)
1505 patch->old_mode = st.st_mode;
1506 if ((st.st_mode ^ patch->old_mode) & S_IFMT)
1507 return error("%s: wrong type", old_name);
1508 if (st.st_mode != patch->old_mode)
1509 fprintf(stderr, "warning: %s has type %o, expected %o\n",
1510 old_name, st.st_mode, patch->old_mode);
1511 }
1512
1513 if (new_name && (patch->is_new | patch->is_rename | patch->is_copy)) {
1514 if (check_index && cache_name_pos(new_name, strlen(new_name)) >= 0)
1515 return error("%s: already exists in index", new_name);
1516 if (!lstat(new_name, &st))
1517 return error("%s: already exists in working directory", new_name);
1518 if (errno != ENOENT)
1519 return error("%s: %s", new_name, strerror(errno));
1520 if (!patch->new_mode) {
1521 if (patch->is_new)
1522 patch->new_mode = S_IFREG | 0644;
1523 else
1524 patch->new_mode = patch->old_mode;
1525 }
1526 }
1527
1528 if (new_name && old_name) {
1529 int same = !strcmp(old_name, new_name);
1530 if (!patch->new_mode)
1531 patch->new_mode = patch->old_mode;
1532 if ((patch->old_mode ^ patch->new_mode) & S_IFMT)
1533 return error("new mode (%o) of %s does not match old mode (%o)%s%s",
1534 patch->new_mode, new_name, patch->old_mode,
1535 same ? "" : " of ", same ? "" : old_name);
1536 }
1537
1538 if (apply_data(patch, &st) < 0)
1539 return error("%s: patch does not apply", name);
1540 return 0;
1541 }
1542
1543 static int check_patch_list(struct patch *patch)
1544 {
1545 int error = 0;
1546
1547 for (;patch ; patch = patch->next)
1548 error |= check_patch(patch);
1549 return error;
1550 }
1551
1552 static inline int is_null_sha1(const unsigned char *sha1)
1553 {
1554 return !memcmp(sha1, null_sha1, 20);
1555 }
1556
1557 static void show_index_list(struct patch *list)
1558 {
1559 struct patch *patch;
1560
1561 /* Once we start supporting the reverse patch, it may be
1562 * worth showing the new sha1 prefix, but until then...
1563 */
1564 for (patch = list; patch; patch = patch->next) {
1565 const unsigned char *sha1_ptr;
1566 unsigned char sha1[20];
1567 const char *name;
1568
1569 name = patch->old_name ? patch->old_name : patch->new_name;
1570 if (patch->is_new)
1571 sha1_ptr = null_sha1;
1572 else if (get_sha1(patch->old_sha1_prefix, sha1))
1573 die("sha1 information is lacking or useless (%s).",
1574 name);
1575 else
1576 sha1_ptr = sha1;
1577
1578 printf("%06o %s ",patch->old_mode, sha1_to_hex(sha1_ptr));
1579 if (line_termination && quote_c_style(name, NULL, NULL, 0))
1580 quote_c_style(name, NULL, stdout, 0);
1581 else
1582 fputs(name, stdout);
1583 putchar(line_termination);
1584 }
1585 }
1586
1587 static void stat_patch_list(struct patch *patch)
1588 {
1589 int files, adds, dels;
1590
1591 for (files = adds = dels = 0 ; patch ; patch = patch->next) {
1592 files++;
1593 adds += patch->lines_added;
1594 dels += patch->lines_deleted;
1595 show_stats(patch);
1596 }
1597
1598 printf(" %d files changed, %d insertions(+), %d deletions(-)\n", files, adds, dels);
1599 }
1600
1601 static void numstat_patch_list(struct patch *patch)
1602 {
1603 for ( ; patch; patch = patch->next) {
1604 const char *name;
1605 name = patch->old_name ? patch->old_name : patch->new_name;
1606 printf("%d\t%d\t", patch->lines_added, patch->lines_deleted);
1607 if (line_termination && quote_c_style(name, NULL, NULL, 0))
1608 quote_c_style(name, NULL, stdout, 0);
1609 else
1610 fputs(name, stdout);
1611 putchar('\n');
1612 }
1613 }
1614
1615 static void show_file_mode_name(const char *newdelete, unsigned int mode, const char *name)
1616 {
1617 if (mode)
1618 printf(" %s mode %06o %s\n", newdelete, mode, name);
1619 else
1620 printf(" %s %s\n", newdelete, name);
1621 }
1622
1623 static void show_mode_change(struct patch *p, int show_name)
1624 {
1625 if (p->old_mode && p->new_mode && p->old_mode != p->new_mode) {
1626 if (show_name)
1627 printf(" mode change %06o => %06o %s\n",
1628 p->old_mode, p->new_mode, p->new_name);
1629 else
1630 printf(" mode change %06o => %06o\n",
1631 p->old_mode, p->new_mode);
1632 }
1633 }
1634
1635 static void show_rename_copy(struct patch *p)
1636 {
1637 const char *renamecopy = p->is_rename ? "rename" : "copy";
1638 const char *old, *new;
1639
1640 /* Find common prefix */
1641 old = p->old_name;
1642 new = p->new_name;
1643 while (1) {
1644 const char *slash_old, *slash_new;
1645 slash_old = strchr(old, '/');
1646 slash_new = strchr(new, '/');
1647 if (!slash_old ||
1648 !slash_new ||
1649 slash_old - old != slash_new - new ||
1650 memcmp(old, new, slash_new - new))
1651 break;
1652 old = slash_old + 1;
1653 new = slash_new + 1;
1654 }
1655 /* p->old_name thru old is the common prefix, and old and new
1656 * through the end of names are renames
1657 */
1658 if (old != p->old_name)
1659 printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
1660 (int)(old - p->old_name), p->old_name,
1661 old, new, p->score);
1662 else
1663 printf(" %s %s => %s (%d%%)\n", renamecopy,
1664 p->old_name, p->new_name, p->score);
1665 show_mode_change(p, 0);
1666 }
1667
1668 static void summary_patch_list(struct patch *patch)
1669 {
1670 struct patch *p;
1671
1672 for (p = patch; p; p = p->next) {
1673 if (p->is_new)
1674 show_file_mode_name("create", p->new_mode, p->new_name);
1675 else if (p->is_delete)
1676 show_file_mode_name("delete", p->old_mode, p->old_name);
1677 else {
1678 if (p->is_rename || p->is_copy)
1679 show_rename_copy(p);
1680 else {
1681 if (p->score) {
1682 printf(" rewrite %s (%d%%)\n",
1683 p->new_name, p->score);
1684 show_mode_change(p, 0);
1685 }
1686 else
1687 show_mode_change(p, 1);
1688 }
1689 }
1690 }
1691 }
1692
1693 static void patch_stats(struct patch *patch)
1694 {
1695 int lines = patch->lines_added + patch->lines_deleted;
1696
1697 if (lines > max_change)
1698 max_change = lines;
1699 if (patch->old_name) {
1700 int len = quote_c_style(patch->old_name, NULL, NULL, 0);
1701 if (!len)
1702 len = strlen(patch->old_name);
1703 if (len > max_len)
1704 max_len = len;
1705 }
1706 if (patch->new_name) {
1707 int len = quote_c_style(patch->new_name, NULL, NULL, 0);
1708 if (!len)
1709 len = strlen(patch->new_name);
1710 if (len > max_len)
1711 max_len = len;
1712 }
1713 }
1714
1715 static void remove_file(struct patch *patch)
1716 {
1717 if (write_index) {
1718 if (remove_file_from_cache(patch->old_name) < 0)
1719 die("unable to remove %s from index", patch->old_name);
1720 }
1721 unlink(patch->old_name);
1722 }
1723
1724 static void add_index_file(const char *path, unsigned mode, void *buf, unsigned long size)
1725 {
1726 struct stat st;
1727 struct cache_entry *ce;
1728 int namelen = strlen(path);
1729 unsigned ce_size = cache_entry_size(namelen);
1730
1731 if (!write_index)
1732 return;
1733
1734 ce = xcalloc(1, ce_size);
1735 memcpy(ce->name, path, namelen);
1736 ce->ce_mode = create_ce_mode(mode);
1737 ce->ce_flags = htons(namelen);
1738 if (lstat(path, &st) < 0)
1739 die("unable to stat newly created file %s", path);
1740 fill_stat_cache_info(ce, &st);
1741 if (write_sha1_file(buf, size, blob_type, ce->sha1) < 0)
1742 die("unable to create backing store for newly created file %s", path);
1743 if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0)
1744 die("unable to add cache entry for %s", path);
1745 }
1746
1747 static int try_create_file(const char *path, unsigned int mode, const char *buf, unsigned long size)
1748 {
1749 int fd;
1750
1751 if (S_ISLNK(mode))
1752 return symlink(buf, path);
1753 fd = open(path, O_CREAT | O_EXCL | O_WRONLY, (mode & 0100) ? 0777 : 0666);
1754 if (fd < 0)
1755 return -1;
1756 while (size) {
1757 int written = xwrite(fd, buf, size);
1758 if (written < 0)
1759 die("writing file %s: %s", path, strerror(errno));
1760 if (!written)
1761 die("out of space writing file %s", path);
1762 buf += written;
1763 size -= written;
1764 }
1765 if (close(fd) < 0)
1766 die("closing file %s: %s", path, strerror(errno));
1767 return 0;
1768 }
1769
1770 /*
1771 * We optimistically assume that the directories exist,
1772 * which is true 99% of the time anyway. If they don't,
1773 * we create them and try again.
1774 */
1775 static void create_one_file(char *path, unsigned mode, const char *buf, unsigned long size)
1776 {
1777 if (!try_create_file(path, mode, buf, size))
1778 return;
1779
1780 if (errno == ENOENT) {
1781 if (safe_create_leading_directories(path))
1782 return;
1783 if (!try_create_file(path, mode, buf, size))
1784 return;
1785 }
1786
1787 if (errno == EEXIST) {
1788 unsigned int nr = getpid();
1789
1790 for (;;) {
1791 const char *newpath;
1792 newpath = mkpath("%s~%u", path, nr);
1793 if (!try_create_file(newpath, mode, buf, size)) {
1794 if (!rename(newpath, path))
1795 return;
1796 unlink(newpath);
1797 break;
1798 }
1799 if (errno != EEXIST)
1800 break;
1801 ++nr;
1802 }
1803 }
1804 die("unable to write file %s mode %o", path, mode);
1805 }
1806
1807 static void create_file(struct patch *patch)
1808 {
1809 char *path = patch->new_name;
1810 unsigned mode = patch->new_mode;
1811 unsigned long size = patch->resultsize;
1812 char *buf = patch->result;
1813
1814 if (!mode)
1815 mode = S_IFREG | 0644;
1816 create_one_file(path, mode, buf, size);
1817 add_index_file(path, mode, buf, size);
1818 }
1819
1820 static void write_out_one_result(struct patch *patch)
1821 {
1822 if (patch->is_delete > 0) {
1823 remove_file(patch);
1824 return;
1825 }
1826 if (patch->is_new > 0 || patch->is_copy) {
1827 create_file(patch);
1828 return;
1829 }
1830 /*
1831 * Rename or modification boils down to the same
1832 * thing: remove the old, write the new
1833 */
1834 remove_file(patch);
1835 create_file(patch);
1836 }
1837
1838 static void write_out_results(struct patch *list, int skipped_patch)
1839 {
1840 if (!list && !skipped_patch)
1841 die("No changes");
1842
1843 while (list) {
1844 write_out_one_result(list);
1845 list = list->next;
1846 }
1847 }
1848
1849 static struct cache_file cache_file;
1850
1851 static struct excludes {
1852 struct excludes *next;
1853 const char *path;
1854 } *excludes;
1855
1856 static int use_patch(struct patch *p)
1857 {
1858 const char *pathname = p->new_name ? p->new_name : p->old_name;
1859 struct excludes *x = excludes;
1860 while (x) {
1861 if (fnmatch(x->path, pathname, 0) == 0)
1862 return 0;
1863 x = x->next;
1864 }
1865 if (0 < prefix_length) {
1866 int pathlen = strlen(pathname);
1867 if (pathlen <= prefix_length ||
1868 memcmp(prefix, pathname, prefix_length))
1869 return 0;
1870 }
1871 return 1;
1872 }
1873
1874 static int apply_patch(int fd, const char *filename)
1875 {
1876 int newfd;
1877 unsigned long offset, size;
1878 char *buffer = read_patch_file(fd, &size);
1879 struct patch *list = NULL, **listp = &list;
1880 int skipped_patch = 0;
1881
1882 patch_input_file = filename;
1883 if (!buffer)
1884 return -1;
1885 offset = 0;
1886 while (size > 0) {
1887 struct patch *patch;
1888 int nr;
1889
1890 patch = xcalloc(1, sizeof(*patch));
1891 nr = parse_chunk(buffer + offset, size, patch);
1892 if (nr < 0)
1893 break;
1894 if (use_patch(patch)) {
1895 patch_stats(patch);
1896 *listp = patch;
1897 listp = &patch->next;
1898 } else {
1899 /* perhaps free it a bit better? */
1900 free(patch);
1901 skipped_patch++;
1902 }
1903 offset += nr;
1904 size -= nr;
1905 }
1906
1907 newfd = -1;
1908 if (whitespace_error && (new_whitespace == error_on_whitespace))
1909 apply = 0;
1910
1911 write_index = check_index && apply;
1912 if (write_index)
1913 newfd = hold_index_file_for_update(&cache_file, get_index_file());
1914 if (check_index) {
1915 if (read_cache() < 0)
1916 die("unable to read index file");
1917 }
1918
1919 if ((check || apply) && check_patch_list(list) < 0)
1920 exit(1);
1921
1922 if (apply)
1923 write_out_results(list, skipped_patch);
1924
1925 if (write_index) {
1926 if (write_cache(newfd, active_cache, active_nr) ||
1927 commit_index_file(&cache_file))
1928 die("Unable to write new cachefile");
1929 }
1930
1931 if (show_index_info)
1932 show_index_list(list);
1933
1934 if (diffstat)
1935 stat_patch_list(list);
1936
1937 if (numstat)
1938 numstat_patch_list(list);
1939
1940 if (summary)
1941 summary_patch_list(list);
1942
1943 free(buffer);
1944 return 0;
1945 }
1946
1947 static int git_apply_config(const char *var, const char *value)
1948 {
1949 if (!strcmp(var, "apply.whitespace")) {
1950 apply_default_whitespace = strdup(value);
1951 return 0;
1952 }
1953 return git_default_config(var, value);
1954 }
1955
1956
1957 int main(int argc, char **argv)
1958 {
1959 int i;
1960 int read_stdin = 1;
1961 const char *whitespace_option = NULL;
1962
1963 for (i = 1; i < argc; i++) {
1964 const char *arg = argv[i];
1965 char *end;
1966 int fd;
1967
1968 if (!strcmp(arg, "-")) {
1969 apply_patch(0, "<stdin>");
1970 read_stdin = 0;
1971 continue;
1972 }
1973 if (!strncmp(arg, "--exclude=", 10)) {
1974 struct excludes *x = xmalloc(sizeof(*x));
1975 x->path = arg + 10;
1976 x->next = excludes;
1977 excludes = x;
1978 continue;
1979 }
1980 if (!strncmp(arg, "-p", 2)) {
1981 p_value = atoi(arg + 2);
1982 continue;
1983 }
1984 if (!strcmp(arg, "--no-add")) {
1985 no_add = 1;
1986 continue;
1987 }
1988 if (!strcmp(arg, "--stat")) {
1989 apply = 0;
1990 diffstat = 1;
1991 continue;
1992 }
1993 if (!strcmp(arg, "--allow-binary-replacement")) {
1994 allow_binary_replacement = 1;
1995 continue;
1996 }
1997 if (!strcmp(arg, "--numstat")) {
1998 apply = 0;
1999 numstat = 1;
2000 continue;
2001 }
2002 if (!strcmp(arg, "--summary")) {
2003 apply = 0;
2004 summary = 1;
2005 continue;
2006 }
2007 if (!strcmp(arg, "--check")) {
2008 apply = 0;
2009 check = 1;
2010 continue;
2011 }
2012 if (!strcmp(arg, "--index")) {
2013 check_index = 1;
2014 continue;
2015 }
2016 if (!strcmp(arg, "--apply")) {
2017 apply = 1;
2018 continue;
2019 }
2020 if (!strcmp(arg, "--index-info")) {
2021 apply = 0;
2022 show_index_info = 1;
2023 continue;
2024 }
2025 if (!strcmp(arg, "-z")) {
2026 line_termination = 0;
2027 continue;
2028 }
2029 if (!strncmp(arg, "-C", 2)) {
2030 p_context = strtoul(arg + 2, &end, 0);
2031 if (*end != '\0')
2032 die("unrecognized context count '%s'", arg + 2);
2033 continue;
2034 }
2035 if (!strncmp(arg, "--whitespace=", 13)) {
2036 whitespace_option = arg + 13;
2037 parse_whitespace_option(arg + 13);
2038 continue;
2039 }
2040
2041 if (check_index && prefix_length < 0) {
2042 prefix = setup_git_directory();
2043 prefix_length = prefix ? strlen(prefix) : 0;
2044 git_config(git_apply_config);
2045 if (!whitespace_option && apply_default_whitespace)
2046 parse_whitespace_option(apply_default_whitespace);
2047 }
2048 if (0 < prefix_length)
2049 arg = prefix_filename(prefix, prefix_length, arg);
2050
2051 fd = open(arg, O_RDONLY);
2052 if (fd < 0)
2053 usage(apply_usage);
2054 read_stdin = 0;
2055 set_default_whitespace_mode(whitespace_option);
2056 apply_patch(fd, arg);
2057 close(fd);
2058 }
2059 set_default_whitespace_mode(whitespace_option);
2060 if (read_stdin)
2061 apply_patch(0, "<stdin>");
2062 if (whitespace_error) {
2063 if (squelch_whitespace_errors &&
2064 squelch_whitespace_errors < whitespace_error) {
2065 int squelched =
2066 whitespace_error - squelch_whitespace_errors;
2067 fprintf(stderr, "warning: squelched %d whitespace error%s\n",
2068 squelched,
2069 squelched == 1 ? "" : "s");
2070 }
2071 if (new_whitespace == error_on_whitespace)
2072 die("%d line%s add%s trailing whitespaces.",
2073 whitespace_error,
2074 whitespace_error == 1 ? "" : "s",
2075 whitespace_error == 1 ? "s" : "");
2076 if (applied_after_stripping)
2077 fprintf(stderr, "warning: %d line%s applied after"
2078 " stripping trailing whitespaces.\n",
2079 applied_after_stripping,
2080 applied_after_stripping == 1 ? "" : "s");
2081 else if (whitespace_error)
2082 fprintf(stderr, "warning: %d line%s add%s trailing"
2083 " whitespaces.\n",
2084 whitespace_error,
2085 whitespace_error == 1 ? "" : "s",
2086 whitespace_error == 1 ? "s" : "");
2087 }
2088 return 0;
2089 }