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Several trivial documentation touch ups.
[thirdparty/git.git] / diff.c
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include <sys/types.h>
5 #include <sys/wait.h>
6 #include <signal.h>
7 #include "cache.h"
8 #include "quote.h"
9 #include "diff.h"
10 #include "diffcore.h"
11 #include "xdiff-interface.h"
12
13 static int use_size_cache;
14
15 int diff_rename_limit_default = -1;
16
17 int git_diff_config(const char *var, const char *value)
18 {
19 if (!strcmp(var, "diff.renamelimit")) {
20 diff_rename_limit_default = git_config_int(var, value);
21 return 0;
22 }
23
24 return git_default_config(var, value);
25 }
26
27 static char *quote_one(const char *str)
28 {
29 int needlen;
30 char *xp;
31
32 if (!str)
33 return NULL;
34 needlen = quote_c_style(str, NULL, NULL, 0);
35 if (!needlen)
36 return strdup(str);
37 xp = xmalloc(needlen + 1);
38 quote_c_style(str, xp, NULL, 0);
39 return xp;
40 }
41
42 static char *quote_two(const char *one, const char *two)
43 {
44 int need_one = quote_c_style(one, NULL, NULL, 1);
45 int need_two = quote_c_style(two, NULL, NULL, 1);
46 char *xp;
47
48 if (need_one + need_two) {
49 if (!need_one) need_one = strlen(one);
50 if (!need_two) need_one = strlen(two);
51
52 xp = xmalloc(need_one + need_two + 3);
53 xp[0] = '"';
54 quote_c_style(one, xp + 1, NULL, 1);
55 quote_c_style(two, xp + need_one + 1, NULL, 1);
56 strcpy(xp + need_one + need_two + 1, "\"");
57 return xp;
58 }
59 need_one = strlen(one);
60 need_two = strlen(two);
61 xp = xmalloc(need_one + need_two + 1);
62 strcpy(xp, one);
63 strcpy(xp + need_one, two);
64 return xp;
65 }
66
67 static const char *external_diff(void)
68 {
69 static const char *external_diff_cmd = NULL;
70 static int done_preparing = 0;
71
72 if (done_preparing)
73 return external_diff_cmd;
74 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
75 done_preparing = 1;
76 return external_diff_cmd;
77 }
78
79 #define TEMPFILE_PATH_LEN 50
80
81 static struct diff_tempfile {
82 const char *name; /* filename external diff should read from */
83 char hex[41];
84 char mode[10];
85 char tmp_path[TEMPFILE_PATH_LEN];
86 } diff_temp[2];
87
88 static int count_lines(const char *data, int size)
89 {
90 int count, ch, completely_empty = 1, nl_just_seen = 0;
91 count = 0;
92 while (0 < size--) {
93 ch = *data++;
94 if (ch == '\n') {
95 count++;
96 nl_just_seen = 1;
97 completely_empty = 0;
98 }
99 else {
100 nl_just_seen = 0;
101 completely_empty = 0;
102 }
103 }
104 if (completely_empty)
105 return 0;
106 if (!nl_just_seen)
107 count++; /* no trailing newline */
108 return count;
109 }
110
111 static void print_line_count(int count)
112 {
113 switch (count) {
114 case 0:
115 printf("0,0");
116 break;
117 case 1:
118 printf("1");
119 break;
120 default:
121 printf("1,%d", count);
122 break;
123 }
124 }
125
126 static void copy_file(int prefix, const char *data, int size)
127 {
128 int ch, nl_just_seen = 1;
129 while (0 < size--) {
130 ch = *data++;
131 if (nl_just_seen)
132 putchar(prefix);
133 putchar(ch);
134 if (ch == '\n')
135 nl_just_seen = 1;
136 else
137 nl_just_seen = 0;
138 }
139 if (!nl_just_seen)
140 printf("\n\\ No newline at end of file\n");
141 }
142
143 static void emit_rewrite_diff(const char *name_a,
144 const char *name_b,
145 struct diff_filespec *one,
146 struct diff_filespec *two)
147 {
148 int lc_a, lc_b;
149 diff_populate_filespec(one, 0);
150 diff_populate_filespec(two, 0);
151 lc_a = count_lines(one->data, one->size);
152 lc_b = count_lines(two->data, two->size);
153 printf("--- %s\n+++ %s\n@@ -", name_a, name_b);
154 print_line_count(lc_a);
155 printf(" +");
156 print_line_count(lc_b);
157 printf(" @@\n");
158 if (lc_a)
159 copy_file('-', one->data, one->size);
160 if (lc_b)
161 copy_file('+', two->data, two->size);
162 }
163
164 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
165 {
166 if (!DIFF_FILE_VALID(one)) {
167 mf->ptr = ""; /* does not matter */
168 mf->size = 0;
169 return 0;
170 }
171 else if (diff_populate_filespec(one, 0))
172 return -1;
173 mf->ptr = one->data;
174 mf->size = one->size;
175 return 0;
176 }
177
178 struct emit_callback {
179 const char **label_path;
180 };
181
182 static int fn_out(void *priv, mmbuffer_t *mb, int nbuf)
183 {
184 int i;
185 struct emit_callback *ecbdata = priv;
186
187 if (ecbdata->label_path[0]) {
188 printf("--- %s\n", ecbdata->label_path[0]);
189 printf("+++ %s\n", ecbdata->label_path[1]);
190 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
191 }
192 for (i = 0; i < nbuf; i++)
193 if (!fwrite(mb[i].ptr, mb[i].size, 1, stdout))
194 return -1;
195 return 0;
196 }
197
198 static char *pprint_rename(const char *a, const char *b)
199 {
200 const char *old = a;
201 const char *new = b;
202 char *name = NULL;
203 int pfx_length, sfx_length;
204 int len_a = strlen(a);
205 int len_b = strlen(b);
206
207 /* Find common prefix */
208 pfx_length = 0;
209 while (*old && *new && *old == *new) {
210 if (*old == '/')
211 pfx_length = old - a + 1;
212 old++;
213 new++;
214 }
215
216 /* Find common suffix */
217 old = a + len_a;
218 new = b + len_b;
219 sfx_length = 0;
220 while (a <= old && b <= new && *old == *new) {
221 if (*old == '/')
222 sfx_length = len_a - (old - a);
223 old--;
224 new--;
225 }
226
227 /*
228 * pfx{mid-a => mid-b}sfx
229 * {pfx-a => pfx-b}sfx
230 * pfx{sfx-a => sfx-b}
231 * name-a => name-b
232 */
233 if (pfx_length + sfx_length) {
234 name = xmalloc(len_a + len_b - pfx_length - sfx_length + 7);
235 sprintf(name, "%.*s{%.*s => %.*s}%s",
236 pfx_length, a,
237 len_a - pfx_length - sfx_length, a + pfx_length,
238 len_b - pfx_length - sfx_length, b + pfx_length,
239 a + len_a - sfx_length);
240 }
241 else {
242 name = xmalloc(len_a + len_b + 5);
243 sprintf(name, "%s => %s", a, b);
244 }
245 return name;
246 }
247
248 struct diffstat_t {
249 struct xdiff_emit_state xm;
250
251 int nr;
252 int alloc;
253 struct diffstat_file {
254 char *name;
255 unsigned is_unmerged:1;
256 unsigned is_binary:1;
257 unsigned is_renamed:1;
258 unsigned int added, deleted;
259 } **files;
260 };
261
262 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
263 const char *name_a,
264 const char *name_b)
265 {
266 struct diffstat_file *x;
267 x = xcalloc(sizeof (*x), 1);
268 if (diffstat->nr == diffstat->alloc) {
269 diffstat->alloc = alloc_nr(diffstat->alloc);
270 diffstat->files = xrealloc(diffstat->files,
271 diffstat->alloc * sizeof(x));
272 }
273 diffstat->files[diffstat->nr++] = x;
274 if (name_b) {
275 x->name = pprint_rename(name_a, name_b);
276 x->is_renamed = 1;
277 }
278 else
279 x->name = strdup(name_a);
280 return x;
281 }
282
283 static void diffstat_consume(void *priv, char *line, unsigned long len)
284 {
285 struct diffstat_t *diffstat = priv;
286 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
287
288 if (line[0] == '+')
289 x->added++;
290 else if (line[0] == '-')
291 x->deleted++;
292 }
293
294 static const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
295 static const char minuses[]= "----------------------------------------------------------------------";
296
297 static void show_stats(struct diffstat_t* data)
298 {
299 char *prefix = "";
300 int i, len, add, del, total, adds = 0, dels = 0;
301 int max, max_change = 0, max_len = 0;
302 int total_files = data->nr;
303
304 if (data->nr == 0)
305 return;
306
307 for (i = 0; i < data->nr; i++) {
308 struct diffstat_file *file = data->files[i];
309
310 len = strlen(file->name);
311 if (max_len < len)
312 max_len = len;
313
314 if (file->is_binary || file->is_unmerged)
315 continue;
316 if (max_change < file->added + file->deleted)
317 max_change = file->added + file->deleted;
318 }
319
320 for (i = 0; i < data->nr; i++) {
321 char *name = data->files[i]->name;
322 int added = data->files[i]->added;
323 int deleted = data->files[i]->deleted;
324
325 if (0 < (len = quote_c_style(name, NULL, NULL, 0))) {
326 char *qname = xmalloc(len + 1);
327 quote_c_style(name, qname, NULL, 0);
328 free(name);
329 data->files[i]->name = name = qname;
330 }
331
332 /*
333 * "scale" the filename
334 */
335 len = strlen(name);
336 max = max_len;
337 if (max > 50)
338 max = 50;
339 if (len > max) {
340 char *slash;
341 prefix = "...";
342 max -= 3;
343 name += len - max;
344 slash = strchr(name, '/');
345 if (slash)
346 name = slash;
347 }
348 len = max;
349
350 /*
351 * scale the add/delete
352 */
353 max = max_change;
354 if (max + len > 70)
355 max = 70 - len;
356
357 if (data->files[i]->is_binary) {
358 printf(" %s%-*s | Bin\n", prefix, len, name);
359 goto free_diffstat_file;
360 }
361 else if (data->files[i]->is_unmerged) {
362 printf(" %s%-*s | Unmerged\n", prefix, len, name);
363 goto free_diffstat_file;
364 }
365 else if (!data->files[i]->is_renamed &&
366 (added + deleted == 0)) {
367 total_files--;
368 goto free_diffstat_file;
369 }
370
371 add = added;
372 del = deleted;
373 total = add + del;
374 adds += add;
375 dels += del;
376
377 if (max_change > 0) {
378 total = (total * max + max_change / 2) / max_change;
379 add = (add * max + max_change / 2) / max_change;
380 del = total - add;
381 }
382 printf(" %s%-*s |%5d %.*s%.*s\n", prefix,
383 len, name, added + deleted,
384 add, pluses, del, minuses);
385 free_diffstat_file:
386 free(data->files[i]->name);
387 free(data->files[i]);
388 }
389 free(data->files);
390 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
391 total_files, adds, dels);
392 }
393
394 #define FIRST_FEW_BYTES 8000
395 static int mmfile_is_binary(mmfile_t *mf)
396 {
397 long sz = mf->size;
398 if (FIRST_FEW_BYTES < sz)
399 sz = FIRST_FEW_BYTES;
400 if (memchr(mf->ptr, 0, sz))
401 return 1;
402 return 0;
403 }
404
405 static void builtin_diff(const char *name_a,
406 const char *name_b,
407 struct diff_filespec *one,
408 struct diff_filespec *two,
409 const char *xfrm_msg,
410 int complete_rewrite)
411 {
412 mmfile_t mf1, mf2;
413 const char *lbl[2];
414 char *a_one, *b_two;
415
416 a_one = quote_two("a/", name_a);
417 b_two = quote_two("b/", name_b);
418 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
419 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
420 printf("diff --git %s %s\n", a_one, b_two);
421 if (lbl[0][0] == '/') {
422 /* /dev/null */
423 printf("new file mode %06o\n", two->mode);
424 if (xfrm_msg && xfrm_msg[0])
425 puts(xfrm_msg);
426 }
427 else if (lbl[1][0] == '/') {
428 printf("deleted file mode %06o\n", one->mode);
429 if (xfrm_msg && xfrm_msg[0])
430 puts(xfrm_msg);
431 }
432 else {
433 if (one->mode != two->mode) {
434 printf("old mode %06o\n", one->mode);
435 printf("new mode %06o\n", two->mode);
436 }
437 if (xfrm_msg && xfrm_msg[0])
438 puts(xfrm_msg);
439 /*
440 * we do not run diff between different kind
441 * of objects.
442 */
443 if ((one->mode ^ two->mode) & S_IFMT)
444 goto free_ab_and_return;
445 if (complete_rewrite) {
446 emit_rewrite_diff(name_a, name_b, one, two);
447 goto free_ab_and_return;
448 }
449 }
450
451 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
452 die("unable to read files to diff");
453
454 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
455 printf("Binary files %s and %s differ\n", lbl[0], lbl[1]);
456 else {
457 /* Crazy xdl interfaces.. */
458 const char *diffopts = getenv("GIT_DIFF_OPTS");
459 xpparam_t xpp;
460 xdemitconf_t xecfg;
461 xdemitcb_t ecb;
462 struct emit_callback ecbdata;
463
464 ecbdata.label_path = lbl;
465 xpp.flags = XDF_NEED_MINIMAL;
466 xecfg.ctxlen = 3;
467 xecfg.flags = XDL_EMIT_FUNCNAMES;
468 if (!diffopts)
469 ;
470 else if (!strncmp(diffopts, "--unified=", 10))
471 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
472 else if (!strncmp(diffopts, "-u", 2))
473 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
474 ecb.outf = fn_out;
475 ecb.priv = &ecbdata;
476 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
477 }
478
479 free_ab_and_return:
480 free(a_one);
481 free(b_two);
482 return;
483 }
484
485 static void builtin_diffstat(const char *name_a, const char *name_b,
486 struct diff_filespec *one,
487 struct diff_filespec *two,
488 struct diffstat_t *diffstat,
489 int complete_rewrite)
490 {
491 mmfile_t mf1, mf2;
492 struct diffstat_file *data;
493
494 data = diffstat_add(diffstat, name_a, name_b);
495
496 if (!one || !two) {
497 data->is_unmerged = 1;
498 return;
499 }
500 if (complete_rewrite) {
501 diff_populate_filespec(one, 0);
502 diff_populate_filespec(two, 0);
503 data->deleted = count_lines(one->data, one->size);
504 data->added = count_lines(two->data, two->size);
505 return;
506 }
507 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
508 die("unable to read files to diff");
509
510 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
511 data->is_binary = 1;
512 else {
513 /* Crazy xdl interfaces.. */
514 xpparam_t xpp;
515 xdemitconf_t xecfg;
516 xdemitcb_t ecb;
517
518 xpp.flags = XDF_NEED_MINIMAL;
519 xecfg.ctxlen = 0;
520 xecfg.flags = 0;
521 ecb.outf = xdiff_outf;
522 ecb.priv = diffstat;
523 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
524 }
525 }
526
527 struct diff_filespec *alloc_filespec(const char *path)
528 {
529 int namelen = strlen(path);
530 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
531
532 memset(spec, 0, sizeof(*spec));
533 spec->path = (char *)(spec + 1);
534 memcpy(spec->path, path, namelen+1);
535 return spec;
536 }
537
538 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
539 unsigned short mode)
540 {
541 if (mode) {
542 spec->mode = canon_mode(mode);
543 memcpy(spec->sha1, sha1, 20);
544 spec->sha1_valid = !!memcmp(sha1, null_sha1, 20);
545 }
546 }
547
548 /*
549 * Given a name and sha1 pair, if the dircache tells us the file in
550 * the work tree has that object contents, return true, so that
551 * prepare_temp_file() does not have to inflate and extract.
552 */
553 static int work_tree_matches(const char *name, const unsigned char *sha1)
554 {
555 struct cache_entry *ce;
556 struct stat st;
557 int pos, len;
558
559 /* We do not read the cache ourselves here, because the
560 * benchmark with my previous version that always reads cache
561 * shows that it makes things worse for diff-tree comparing
562 * two linux-2.6 kernel trees in an already checked out work
563 * tree. This is because most diff-tree comparisons deal with
564 * only a small number of files, while reading the cache is
565 * expensive for a large project, and its cost outweighs the
566 * savings we get by not inflating the object to a temporary
567 * file. Practically, this code only helps when we are used
568 * by diff-cache --cached, which does read the cache before
569 * calling us.
570 */
571 if (!active_cache)
572 return 0;
573
574 len = strlen(name);
575 pos = cache_name_pos(name, len);
576 if (pos < 0)
577 return 0;
578 ce = active_cache[pos];
579 if ((lstat(name, &st) < 0) ||
580 !S_ISREG(st.st_mode) || /* careful! */
581 ce_match_stat(ce, &st, 0) ||
582 memcmp(sha1, ce->sha1, 20))
583 return 0;
584 /* we return 1 only when we can stat, it is a regular file,
585 * stat information matches, and sha1 recorded in the cache
586 * matches. I.e. we know the file in the work tree really is
587 * the same as the <name, sha1> pair.
588 */
589 return 1;
590 }
591
592 static struct sha1_size_cache {
593 unsigned char sha1[20];
594 unsigned long size;
595 } **sha1_size_cache;
596 static int sha1_size_cache_nr, sha1_size_cache_alloc;
597
598 static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
599 int find_only,
600 unsigned long size)
601 {
602 int first, last;
603 struct sha1_size_cache *e;
604
605 first = 0;
606 last = sha1_size_cache_nr;
607 while (last > first) {
608 int cmp, next = (last + first) >> 1;
609 e = sha1_size_cache[next];
610 cmp = memcmp(e->sha1, sha1, 20);
611 if (!cmp)
612 return e;
613 if (cmp < 0) {
614 last = next;
615 continue;
616 }
617 first = next+1;
618 }
619 /* not found */
620 if (find_only)
621 return NULL;
622 /* insert to make it at "first" */
623 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
624 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
625 sha1_size_cache = xrealloc(sha1_size_cache,
626 sha1_size_cache_alloc *
627 sizeof(*sha1_size_cache));
628 }
629 sha1_size_cache_nr++;
630 if (first < sha1_size_cache_nr)
631 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
632 (sha1_size_cache_nr - first - 1) *
633 sizeof(*sha1_size_cache));
634 e = xmalloc(sizeof(struct sha1_size_cache));
635 sha1_size_cache[first] = e;
636 memcpy(e->sha1, sha1, 20);
637 e->size = size;
638 return e;
639 }
640
641 /*
642 * While doing rename detection and pickaxe operation, we may need to
643 * grab the data for the blob (or file) for our own in-core comparison.
644 * diff_filespec has data and size fields for this purpose.
645 */
646 int diff_populate_filespec(struct diff_filespec *s, int size_only)
647 {
648 int err = 0;
649 if (!DIFF_FILE_VALID(s))
650 die("internal error: asking to populate invalid file.");
651 if (S_ISDIR(s->mode))
652 return -1;
653
654 if (!use_size_cache)
655 size_only = 0;
656
657 if (s->data)
658 return err;
659 if (!s->sha1_valid ||
660 work_tree_matches(s->path, s->sha1)) {
661 struct stat st;
662 int fd;
663 if (lstat(s->path, &st) < 0) {
664 if (errno == ENOENT) {
665 err_empty:
666 err = -1;
667 empty:
668 s->data = "";
669 s->size = 0;
670 return err;
671 }
672 }
673 s->size = st.st_size;
674 if (!s->size)
675 goto empty;
676 if (size_only)
677 return 0;
678 if (S_ISLNK(st.st_mode)) {
679 int ret;
680 s->data = xmalloc(s->size);
681 s->should_free = 1;
682 ret = readlink(s->path, s->data, s->size);
683 if (ret < 0) {
684 free(s->data);
685 goto err_empty;
686 }
687 return 0;
688 }
689 fd = open(s->path, O_RDONLY);
690 if (fd < 0)
691 goto err_empty;
692 s->data = mmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
693 close(fd);
694 if (s->data == MAP_FAILED)
695 goto err_empty;
696 s->should_munmap = 1;
697 }
698 else {
699 char type[20];
700 struct sha1_size_cache *e;
701
702 if (size_only) {
703 e = locate_size_cache(s->sha1, 1, 0);
704 if (e) {
705 s->size = e->size;
706 return 0;
707 }
708 if (!sha1_object_info(s->sha1, type, &s->size))
709 locate_size_cache(s->sha1, 0, s->size);
710 }
711 else {
712 s->data = read_sha1_file(s->sha1, type, &s->size);
713 s->should_free = 1;
714 }
715 }
716 return 0;
717 }
718
719 void diff_free_filespec_data(struct diff_filespec *s)
720 {
721 if (s->should_free)
722 free(s->data);
723 else if (s->should_munmap)
724 munmap(s->data, s->size);
725 s->should_free = s->should_munmap = 0;
726 s->data = NULL;
727 free(s->cnt_data);
728 s->cnt_data = NULL;
729 }
730
731 static void prep_temp_blob(struct diff_tempfile *temp,
732 void *blob,
733 unsigned long size,
734 const unsigned char *sha1,
735 int mode)
736 {
737 int fd;
738
739 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
740 if (fd < 0)
741 die("unable to create temp-file");
742 if (write(fd, blob, size) != size)
743 die("unable to write temp-file");
744 close(fd);
745 temp->name = temp->tmp_path;
746 strcpy(temp->hex, sha1_to_hex(sha1));
747 temp->hex[40] = 0;
748 sprintf(temp->mode, "%06o", mode);
749 }
750
751 static void prepare_temp_file(const char *name,
752 struct diff_tempfile *temp,
753 struct diff_filespec *one)
754 {
755 if (!DIFF_FILE_VALID(one)) {
756 not_a_valid_file:
757 /* A '-' entry produces this for file-2, and
758 * a '+' entry produces this for file-1.
759 */
760 temp->name = "/dev/null";
761 strcpy(temp->hex, ".");
762 strcpy(temp->mode, ".");
763 return;
764 }
765
766 if (!one->sha1_valid ||
767 work_tree_matches(name, one->sha1)) {
768 struct stat st;
769 if (lstat(name, &st) < 0) {
770 if (errno == ENOENT)
771 goto not_a_valid_file;
772 die("stat(%s): %s", name, strerror(errno));
773 }
774 if (S_ISLNK(st.st_mode)) {
775 int ret;
776 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
777 if (sizeof(buf) <= st.st_size)
778 die("symlink too long: %s", name);
779 ret = readlink(name, buf, st.st_size);
780 if (ret < 0)
781 die("readlink(%s)", name);
782 prep_temp_blob(temp, buf, st.st_size,
783 (one->sha1_valid ?
784 one->sha1 : null_sha1),
785 (one->sha1_valid ?
786 one->mode : S_IFLNK));
787 }
788 else {
789 /* we can borrow from the file in the work tree */
790 temp->name = name;
791 if (!one->sha1_valid)
792 strcpy(temp->hex, sha1_to_hex(null_sha1));
793 else
794 strcpy(temp->hex, sha1_to_hex(one->sha1));
795 /* Even though we may sometimes borrow the
796 * contents from the work tree, we always want
797 * one->mode. mode is trustworthy even when
798 * !(one->sha1_valid), as long as
799 * DIFF_FILE_VALID(one).
800 */
801 sprintf(temp->mode, "%06o", one->mode);
802 }
803 return;
804 }
805 else {
806 if (diff_populate_filespec(one, 0))
807 die("cannot read data blob for %s", one->path);
808 prep_temp_blob(temp, one->data, one->size,
809 one->sha1, one->mode);
810 }
811 }
812
813 static void remove_tempfile(void)
814 {
815 int i;
816
817 for (i = 0; i < 2; i++)
818 if (diff_temp[i].name == diff_temp[i].tmp_path) {
819 unlink(diff_temp[i].name);
820 diff_temp[i].name = NULL;
821 }
822 }
823
824 static void remove_tempfile_on_signal(int signo)
825 {
826 remove_tempfile();
827 signal(SIGINT, SIG_DFL);
828 raise(signo);
829 }
830
831 static int spawn_prog(const char *pgm, const char **arg)
832 {
833 pid_t pid;
834 int status;
835
836 fflush(NULL);
837 pid = fork();
838 if (pid < 0)
839 die("unable to fork");
840 if (!pid) {
841 execvp(pgm, (char *const*) arg);
842 exit(255);
843 }
844
845 while (waitpid(pid, &status, 0) < 0) {
846 if (errno == EINTR)
847 continue;
848 return -1;
849 }
850
851 /* Earlier we did not check the exit status because
852 * diff exits non-zero if files are different, and
853 * we are not interested in knowing that. It was a
854 * mistake which made it harder to quit a diff-*
855 * session that uses the git-apply-patch-script as
856 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
857 * should also exit non-zero only when it wants to
858 * abort the entire diff-* session.
859 */
860 if (WIFEXITED(status) && !WEXITSTATUS(status))
861 return 0;
862 return -1;
863 }
864
865 /* An external diff command takes:
866 *
867 * diff-cmd name infile1 infile1-sha1 infile1-mode \
868 * infile2 infile2-sha1 infile2-mode [ rename-to ]
869 *
870 */
871 static void run_external_diff(const char *pgm,
872 const char *name,
873 const char *other,
874 struct diff_filespec *one,
875 struct diff_filespec *two,
876 const char *xfrm_msg,
877 int complete_rewrite)
878 {
879 const char *spawn_arg[10];
880 struct diff_tempfile *temp = diff_temp;
881 int retval;
882 static int atexit_asked = 0;
883 const char *othername;
884 const char **arg = &spawn_arg[0];
885
886 othername = (other? other : name);
887 if (one && two) {
888 prepare_temp_file(name, &temp[0], one);
889 prepare_temp_file(othername, &temp[1], two);
890 if (! atexit_asked &&
891 (temp[0].name == temp[0].tmp_path ||
892 temp[1].name == temp[1].tmp_path)) {
893 atexit_asked = 1;
894 atexit(remove_tempfile);
895 }
896 signal(SIGINT, remove_tempfile_on_signal);
897 }
898
899 if (one && two) {
900 *arg++ = pgm;
901 *arg++ = name;
902 *arg++ = temp[0].name;
903 *arg++ = temp[0].hex;
904 *arg++ = temp[0].mode;
905 *arg++ = temp[1].name;
906 *arg++ = temp[1].hex;
907 *arg++ = temp[1].mode;
908 if (other) {
909 *arg++ = other;
910 *arg++ = xfrm_msg;
911 }
912 } else {
913 *arg++ = pgm;
914 *arg++ = name;
915 }
916 *arg = NULL;
917 retval = spawn_prog(pgm, spawn_arg);
918 remove_tempfile();
919 if (retval) {
920 fprintf(stderr, "external diff died, stopping at %s.\n", name);
921 exit(1);
922 }
923 }
924
925 static void run_diff_cmd(const char *pgm,
926 const char *name,
927 const char *other,
928 struct diff_filespec *one,
929 struct diff_filespec *two,
930 const char *xfrm_msg,
931 int complete_rewrite)
932 {
933 if (pgm) {
934 run_external_diff(pgm, name, other, one, two, xfrm_msg,
935 complete_rewrite);
936 return;
937 }
938 if (one && two)
939 builtin_diff(name, other ? other : name,
940 one, two, xfrm_msg, complete_rewrite);
941 else
942 printf("* Unmerged path %s\n", name);
943 }
944
945 static void diff_fill_sha1_info(struct diff_filespec *one)
946 {
947 if (DIFF_FILE_VALID(one)) {
948 if (!one->sha1_valid) {
949 struct stat st;
950 if (lstat(one->path, &st) < 0)
951 die("stat %s", one->path);
952 if (index_path(one->sha1, one->path, &st, 0))
953 die("cannot hash %s\n", one->path);
954 }
955 }
956 else
957 memset(one->sha1, 0, 20);
958 }
959
960 static void run_diff(struct diff_filepair *p, struct diff_options *o)
961 {
962 const char *pgm = external_diff();
963 char msg[PATH_MAX*2+300], *xfrm_msg;
964 struct diff_filespec *one;
965 struct diff_filespec *two;
966 const char *name;
967 const char *other;
968 char *name_munged, *other_munged;
969 int complete_rewrite = 0;
970 int len;
971
972 if (DIFF_PAIR_UNMERGED(p)) {
973 /* unmerged */
974 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, 0);
975 return;
976 }
977
978 name = p->one->path;
979 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
980 name_munged = quote_one(name);
981 other_munged = quote_one(other);
982 one = p->one; two = p->two;
983
984 diff_fill_sha1_info(one);
985 diff_fill_sha1_info(two);
986
987 len = 0;
988 switch (p->status) {
989 case DIFF_STATUS_COPIED:
990 len += snprintf(msg + len, sizeof(msg) - len,
991 "similarity index %d%%\n"
992 "copy from %s\n"
993 "copy to %s\n",
994 (int)(0.5 + p->score * 100.0/MAX_SCORE),
995 name_munged, other_munged);
996 break;
997 case DIFF_STATUS_RENAMED:
998 len += snprintf(msg + len, sizeof(msg) - len,
999 "similarity index %d%%\n"
1000 "rename from %s\n"
1001 "rename to %s\n",
1002 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1003 name_munged, other_munged);
1004 break;
1005 case DIFF_STATUS_MODIFIED:
1006 if (p->score) {
1007 len += snprintf(msg + len, sizeof(msg) - len,
1008 "dissimilarity index %d%%\n",
1009 (int)(0.5 + p->score *
1010 100.0/MAX_SCORE));
1011 complete_rewrite = 1;
1012 break;
1013 }
1014 /* fallthru */
1015 default:
1016 /* nothing */
1017 ;
1018 }
1019
1020 if (memcmp(one->sha1, two->sha1, 20)) {
1021 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1022
1023 len += snprintf(msg + len, sizeof(msg) - len,
1024 "index %.*s..%.*s",
1025 abbrev, sha1_to_hex(one->sha1),
1026 abbrev, sha1_to_hex(two->sha1));
1027 if (one->mode == two->mode)
1028 len += snprintf(msg + len, sizeof(msg) - len,
1029 " %06o", one->mode);
1030 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1031 }
1032
1033 if (len)
1034 msg[--len] = 0;
1035 xfrm_msg = len ? msg : NULL;
1036
1037 if (!pgm &&
1038 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1039 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1040 /* a filepair that changes between file and symlink
1041 * needs to be split into deletion and creation.
1042 */
1043 struct diff_filespec *null = alloc_filespec(two->path);
1044 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, 0);
1045 free(null);
1046 null = alloc_filespec(one->path);
1047 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, 0);
1048 free(null);
1049 }
1050 else
1051 run_diff_cmd(pgm, name, other, one, two, xfrm_msg,
1052 complete_rewrite);
1053
1054 free(name_munged);
1055 free(other_munged);
1056 }
1057
1058 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1059 struct diffstat_t *diffstat)
1060 {
1061 const char *name;
1062 const char *other;
1063 int complete_rewrite = 0;
1064
1065 if (DIFF_PAIR_UNMERGED(p)) {
1066 /* unmerged */
1067 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, 0);
1068 return;
1069 }
1070
1071 name = p->one->path;
1072 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1073
1074 diff_fill_sha1_info(p->one);
1075 diff_fill_sha1_info(p->two);
1076
1077 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1078 complete_rewrite = 1;
1079 builtin_diffstat(name, other, p->one, p->two, diffstat, complete_rewrite);
1080 }
1081
1082 void diff_setup(struct diff_options *options)
1083 {
1084 memset(options, 0, sizeof(*options));
1085 options->output_format = DIFF_FORMAT_RAW;
1086 options->line_termination = '\n';
1087 options->break_opt = -1;
1088 options->rename_limit = -1;
1089
1090 options->change = diff_change;
1091 options->add_remove = diff_addremove;
1092 }
1093
1094 int diff_setup_done(struct diff_options *options)
1095 {
1096 if ((options->find_copies_harder &&
1097 options->detect_rename != DIFF_DETECT_COPY) ||
1098 (0 <= options->rename_limit && !options->detect_rename))
1099 return -1;
1100
1101 /*
1102 * These cases always need recursive; we do not drop caller-supplied
1103 * recursive bits for other formats here.
1104 */
1105 if ((options->output_format == DIFF_FORMAT_PATCH) ||
1106 (options->output_format == DIFF_FORMAT_DIFFSTAT))
1107 options->recursive = 1;
1108
1109 if (options->detect_rename && options->rename_limit < 0)
1110 options->rename_limit = diff_rename_limit_default;
1111 if (options->setup & DIFF_SETUP_USE_CACHE) {
1112 if (!active_cache)
1113 /* read-cache does not die even when it fails
1114 * so it is safe for us to do this here. Also
1115 * it does not smudge active_cache or active_nr
1116 * when it fails, so we do not have to worry about
1117 * cleaning it up ourselves either.
1118 */
1119 read_cache();
1120 }
1121 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
1122 use_size_cache = 1;
1123 if (options->abbrev <= 0 || 40 < options->abbrev)
1124 options->abbrev = 40; /* full */
1125
1126 return 0;
1127 }
1128
1129 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
1130 {
1131 const char *arg = av[0];
1132 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
1133 options->output_format = DIFF_FORMAT_PATCH;
1134 else if (!strcmp(arg, "--patch-with-raw")) {
1135 options->output_format = DIFF_FORMAT_PATCH;
1136 options->with_raw = 1;
1137 }
1138 else if (!strcmp(arg, "--stat"))
1139 options->output_format = DIFF_FORMAT_DIFFSTAT;
1140 else if (!strcmp(arg, "--patch-with-stat")) {
1141 options->output_format = DIFF_FORMAT_PATCH;
1142 options->with_stat = 1;
1143 }
1144 else if (!strcmp(arg, "-z"))
1145 options->line_termination = 0;
1146 else if (!strncmp(arg, "-l", 2))
1147 options->rename_limit = strtoul(arg+2, NULL, 10);
1148 else if (!strcmp(arg, "--full-index"))
1149 options->full_index = 1;
1150 else if (!strcmp(arg, "--name-only"))
1151 options->output_format = DIFF_FORMAT_NAME;
1152 else if (!strcmp(arg, "--name-status"))
1153 options->output_format = DIFF_FORMAT_NAME_STATUS;
1154 else if (!strcmp(arg, "-R"))
1155 options->reverse_diff = 1;
1156 else if (!strncmp(arg, "-S", 2))
1157 options->pickaxe = arg + 2;
1158 else if (!strcmp(arg, "-s"))
1159 options->output_format = DIFF_FORMAT_NO_OUTPUT;
1160 else if (!strncmp(arg, "-O", 2))
1161 options->orderfile = arg + 2;
1162 else if (!strncmp(arg, "--diff-filter=", 14))
1163 options->filter = arg + 14;
1164 else if (!strcmp(arg, "--pickaxe-all"))
1165 options->pickaxe_opts = DIFF_PICKAXE_ALL;
1166 else if (!strcmp(arg, "--pickaxe-regex"))
1167 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
1168 else if (!strncmp(arg, "-B", 2)) {
1169 if ((options->break_opt =
1170 diff_scoreopt_parse(arg)) == -1)
1171 return -1;
1172 }
1173 else if (!strncmp(arg, "-M", 2)) {
1174 if ((options->rename_score =
1175 diff_scoreopt_parse(arg)) == -1)
1176 return -1;
1177 options->detect_rename = DIFF_DETECT_RENAME;
1178 }
1179 else if (!strncmp(arg, "-C", 2)) {
1180 if ((options->rename_score =
1181 diff_scoreopt_parse(arg)) == -1)
1182 return -1;
1183 options->detect_rename = DIFF_DETECT_COPY;
1184 }
1185 else if (!strcmp(arg, "--find-copies-harder"))
1186 options->find_copies_harder = 1;
1187 else if (!strcmp(arg, "--abbrev"))
1188 options->abbrev = DEFAULT_ABBREV;
1189 else if (!strncmp(arg, "--abbrev=", 9)) {
1190 options->abbrev = strtoul(arg + 9, NULL, 10);
1191 if (options->abbrev < MINIMUM_ABBREV)
1192 options->abbrev = MINIMUM_ABBREV;
1193 else if (40 < options->abbrev)
1194 options->abbrev = 40;
1195 }
1196 else
1197 return 0;
1198 return 1;
1199 }
1200
1201 static int parse_num(const char **cp_p)
1202 {
1203 unsigned long num, scale;
1204 int ch, dot;
1205 const char *cp = *cp_p;
1206
1207 num = 0;
1208 scale = 1;
1209 dot = 0;
1210 for(;;) {
1211 ch = *cp;
1212 if ( !dot && ch == '.' ) {
1213 scale = 1;
1214 dot = 1;
1215 } else if ( ch == '%' ) {
1216 scale = dot ? scale*100 : 100;
1217 cp++; /* % is always at the end */
1218 break;
1219 } else if ( ch >= '0' && ch <= '9' ) {
1220 if ( scale < 100000 ) {
1221 scale *= 10;
1222 num = (num*10) + (ch-'0');
1223 }
1224 } else {
1225 break;
1226 }
1227 cp++;
1228 }
1229 *cp_p = cp;
1230
1231 /* user says num divided by scale and we say internally that
1232 * is MAX_SCORE * num / scale.
1233 */
1234 return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
1235 }
1236
1237 int diff_scoreopt_parse(const char *opt)
1238 {
1239 int opt1, opt2, cmd;
1240
1241 if (*opt++ != '-')
1242 return -1;
1243 cmd = *opt++;
1244 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
1245 return -1; /* that is not a -M, -C nor -B option */
1246
1247 opt1 = parse_num(&opt);
1248 if (cmd != 'B')
1249 opt2 = 0;
1250 else {
1251 if (*opt == 0)
1252 opt2 = 0;
1253 else if (*opt != '/')
1254 return -1; /* we expect -B80/99 or -B80 */
1255 else {
1256 opt++;
1257 opt2 = parse_num(&opt);
1258 }
1259 }
1260 if (*opt != 0)
1261 return -1;
1262 return opt1 | (opt2 << 16);
1263 }
1264
1265 struct diff_queue_struct diff_queued_diff;
1266
1267 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
1268 {
1269 if (queue->alloc <= queue->nr) {
1270 queue->alloc = alloc_nr(queue->alloc);
1271 queue->queue = xrealloc(queue->queue,
1272 sizeof(dp) * queue->alloc);
1273 }
1274 queue->queue[queue->nr++] = dp;
1275 }
1276
1277 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
1278 struct diff_filespec *one,
1279 struct diff_filespec *two)
1280 {
1281 struct diff_filepair *dp = xmalloc(sizeof(*dp));
1282 dp->one = one;
1283 dp->two = two;
1284 dp->score = 0;
1285 dp->status = 0;
1286 dp->source_stays = 0;
1287 dp->broken_pair = 0;
1288 if (queue)
1289 diff_q(queue, dp);
1290 return dp;
1291 }
1292
1293 void diff_free_filepair(struct diff_filepair *p)
1294 {
1295 diff_free_filespec_data(p->one);
1296 diff_free_filespec_data(p->two);
1297 free(p->one);
1298 free(p->two);
1299 free(p);
1300 }
1301
1302 /* This is different from find_unique_abbrev() in that
1303 * it stuffs the result with dots for alignment.
1304 */
1305 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
1306 {
1307 int abblen;
1308 const char *abbrev;
1309 if (len == 40)
1310 return sha1_to_hex(sha1);
1311
1312 abbrev = find_unique_abbrev(sha1, len);
1313 if (!abbrev)
1314 return sha1_to_hex(sha1);
1315 abblen = strlen(abbrev);
1316 if (abblen < 37) {
1317 static char hex[41];
1318 if (len < abblen && abblen <= len + 2)
1319 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
1320 else
1321 sprintf(hex, "%s...", abbrev);
1322 return hex;
1323 }
1324 return sha1_to_hex(sha1);
1325 }
1326
1327 static void diff_flush_raw(struct diff_filepair *p,
1328 int line_termination,
1329 int inter_name_termination,
1330 struct diff_options *options,
1331 int output_format)
1332 {
1333 int two_paths;
1334 char status[10];
1335 int abbrev = options->abbrev;
1336 const char *path_one, *path_two;
1337
1338 path_one = p->one->path;
1339 path_two = p->two->path;
1340 if (line_termination) {
1341 path_one = quote_one(path_one);
1342 path_two = quote_one(path_two);
1343 }
1344
1345 if (p->score)
1346 sprintf(status, "%c%03d", p->status,
1347 (int)(0.5 + p->score * 100.0/MAX_SCORE));
1348 else {
1349 status[0] = p->status;
1350 status[1] = 0;
1351 }
1352 switch (p->status) {
1353 case DIFF_STATUS_COPIED:
1354 case DIFF_STATUS_RENAMED:
1355 two_paths = 1;
1356 break;
1357 case DIFF_STATUS_ADDED:
1358 case DIFF_STATUS_DELETED:
1359 two_paths = 0;
1360 break;
1361 default:
1362 two_paths = 0;
1363 break;
1364 }
1365 if (output_format != DIFF_FORMAT_NAME_STATUS) {
1366 printf(":%06o %06o %s ",
1367 p->one->mode, p->two->mode,
1368 diff_unique_abbrev(p->one->sha1, abbrev));
1369 printf("%s ",
1370 diff_unique_abbrev(p->two->sha1, abbrev));
1371 }
1372 printf("%s%c%s", status, inter_name_termination, path_one);
1373 if (two_paths)
1374 printf("%c%s", inter_name_termination, path_two);
1375 putchar(line_termination);
1376 if (path_one != p->one->path)
1377 free((void*)path_one);
1378 if (path_two != p->two->path)
1379 free((void*)path_two);
1380 }
1381
1382 static void diff_flush_name(struct diff_filepair *p,
1383 int inter_name_termination,
1384 int line_termination)
1385 {
1386 char *path = p->two->path;
1387
1388 if (line_termination)
1389 path = quote_one(p->two->path);
1390 else
1391 path = p->two->path;
1392 printf("%s%c", path, line_termination);
1393 if (p->two->path != path)
1394 free(path);
1395 }
1396
1397 int diff_unmodified_pair(struct diff_filepair *p)
1398 {
1399 /* This function is written stricter than necessary to support
1400 * the currently implemented transformers, but the idea is to
1401 * let transformers to produce diff_filepairs any way they want,
1402 * and filter and clean them up here before producing the output.
1403 */
1404 struct diff_filespec *one, *two;
1405
1406 if (DIFF_PAIR_UNMERGED(p))
1407 return 0; /* unmerged is interesting */
1408
1409 one = p->one;
1410 two = p->two;
1411
1412 /* deletion, addition, mode or type change
1413 * and rename are all interesting.
1414 */
1415 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
1416 DIFF_PAIR_MODE_CHANGED(p) ||
1417 strcmp(one->path, two->path))
1418 return 0;
1419
1420 /* both are valid and point at the same path. that is, we are
1421 * dealing with a change.
1422 */
1423 if (one->sha1_valid && two->sha1_valid &&
1424 !memcmp(one->sha1, two->sha1, sizeof(one->sha1)))
1425 return 1; /* no change */
1426 if (!one->sha1_valid && !two->sha1_valid)
1427 return 1; /* both look at the same file on the filesystem. */
1428 return 0;
1429 }
1430
1431 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
1432 {
1433 if (diff_unmodified_pair(p))
1434 return;
1435
1436 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1437 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1438 return; /* no tree diffs in patch format */
1439
1440 run_diff(p, o);
1441 }
1442
1443 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
1444 struct diffstat_t *diffstat)
1445 {
1446 if (diff_unmodified_pair(p))
1447 return;
1448
1449 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1450 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1451 return; /* no tree diffs in patch format */
1452
1453 run_diffstat(p, o, diffstat);
1454 }
1455
1456 int diff_queue_is_empty(void)
1457 {
1458 struct diff_queue_struct *q = &diff_queued_diff;
1459 int i;
1460 for (i = 0; i < q->nr; i++)
1461 if (!diff_unmodified_pair(q->queue[i]))
1462 return 0;
1463 return 1;
1464 }
1465
1466 #if DIFF_DEBUG
1467 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
1468 {
1469 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
1470 x, one ? one : "",
1471 s->path,
1472 DIFF_FILE_VALID(s) ? "valid" : "invalid",
1473 s->mode,
1474 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
1475 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
1476 x, one ? one : "",
1477 s->size, s->xfrm_flags);
1478 }
1479
1480 void diff_debug_filepair(const struct diff_filepair *p, int i)
1481 {
1482 diff_debug_filespec(p->one, i, "one");
1483 diff_debug_filespec(p->two, i, "two");
1484 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
1485 p->score, p->status ? p->status : '?',
1486 p->source_stays, p->broken_pair);
1487 }
1488
1489 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
1490 {
1491 int i;
1492 if (msg)
1493 fprintf(stderr, "%s\n", msg);
1494 fprintf(stderr, "q->nr = %d\n", q->nr);
1495 for (i = 0; i < q->nr; i++) {
1496 struct diff_filepair *p = q->queue[i];
1497 diff_debug_filepair(p, i);
1498 }
1499 }
1500 #endif
1501
1502 static void diff_resolve_rename_copy(void)
1503 {
1504 int i, j;
1505 struct diff_filepair *p, *pp;
1506 struct diff_queue_struct *q = &diff_queued_diff;
1507
1508 diff_debug_queue("resolve-rename-copy", q);
1509
1510 for (i = 0; i < q->nr; i++) {
1511 p = q->queue[i];
1512 p->status = 0; /* undecided */
1513 if (DIFF_PAIR_UNMERGED(p))
1514 p->status = DIFF_STATUS_UNMERGED;
1515 else if (!DIFF_FILE_VALID(p->one))
1516 p->status = DIFF_STATUS_ADDED;
1517 else if (!DIFF_FILE_VALID(p->two))
1518 p->status = DIFF_STATUS_DELETED;
1519 else if (DIFF_PAIR_TYPE_CHANGED(p))
1520 p->status = DIFF_STATUS_TYPE_CHANGED;
1521
1522 /* from this point on, we are dealing with a pair
1523 * whose both sides are valid and of the same type, i.e.
1524 * either in-place edit or rename/copy edit.
1525 */
1526 else if (DIFF_PAIR_RENAME(p)) {
1527 if (p->source_stays) {
1528 p->status = DIFF_STATUS_COPIED;
1529 continue;
1530 }
1531 /* See if there is some other filepair that
1532 * copies from the same source as us. If so
1533 * we are a copy. Otherwise we are either a
1534 * copy if the path stays, or a rename if it
1535 * does not, but we already handled "stays" case.
1536 */
1537 for (j = i + 1; j < q->nr; j++) {
1538 pp = q->queue[j];
1539 if (strcmp(pp->one->path, p->one->path))
1540 continue; /* not us */
1541 if (!DIFF_PAIR_RENAME(pp))
1542 continue; /* not a rename/copy */
1543 /* pp is a rename/copy from the same source */
1544 p->status = DIFF_STATUS_COPIED;
1545 break;
1546 }
1547 if (!p->status)
1548 p->status = DIFF_STATUS_RENAMED;
1549 }
1550 else if (memcmp(p->one->sha1, p->two->sha1, 20) ||
1551 p->one->mode != p->two->mode)
1552 p->status = DIFF_STATUS_MODIFIED;
1553 else {
1554 /* This is a "no-change" entry and should not
1555 * happen anymore, but prepare for broken callers.
1556 */
1557 error("feeding unmodified %s to diffcore",
1558 p->one->path);
1559 p->status = DIFF_STATUS_UNKNOWN;
1560 }
1561 }
1562 diff_debug_queue("resolve-rename-copy done", q);
1563 }
1564
1565 static void flush_one_pair(struct diff_filepair *p,
1566 int diff_output_format,
1567 struct diff_options *options,
1568 struct diffstat_t *diffstat)
1569 {
1570 int inter_name_termination = '\t';
1571 int line_termination = options->line_termination;
1572 if (!line_termination)
1573 inter_name_termination = 0;
1574
1575 switch (p->status) {
1576 case DIFF_STATUS_UNKNOWN:
1577 break;
1578 case 0:
1579 die("internal error in diff-resolve-rename-copy");
1580 break;
1581 default:
1582 switch (diff_output_format) {
1583 case DIFF_FORMAT_DIFFSTAT:
1584 diff_flush_stat(p, options, diffstat);
1585 break;
1586 case DIFF_FORMAT_PATCH:
1587 diff_flush_patch(p, options);
1588 break;
1589 case DIFF_FORMAT_RAW:
1590 case DIFF_FORMAT_NAME_STATUS:
1591 diff_flush_raw(p, line_termination,
1592 inter_name_termination,
1593 options, diff_output_format);
1594 break;
1595 case DIFF_FORMAT_NAME:
1596 diff_flush_name(p,
1597 inter_name_termination,
1598 line_termination);
1599 break;
1600 case DIFF_FORMAT_NO_OUTPUT:
1601 break;
1602 }
1603 }
1604 }
1605
1606 void diff_flush(struct diff_options *options)
1607 {
1608 struct diff_queue_struct *q = &diff_queued_diff;
1609 int i;
1610 int diff_output_format = options->output_format;
1611 struct diffstat_t *diffstat = NULL;
1612
1613 if (diff_output_format == DIFF_FORMAT_DIFFSTAT || options->with_stat) {
1614 diffstat = xcalloc(sizeof (struct diffstat_t), 1);
1615 diffstat->xm.consume = diffstat_consume;
1616 }
1617
1618 if (options->with_raw) {
1619 for (i = 0; i < q->nr; i++) {
1620 struct diff_filepair *p = q->queue[i];
1621 flush_one_pair(p, DIFF_FORMAT_RAW, options, NULL);
1622 }
1623 putchar(options->line_termination);
1624 }
1625 if (options->with_stat) {
1626 for (i = 0; i < q->nr; i++) {
1627 struct diff_filepair *p = q->queue[i];
1628 flush_one_pair(p, DIFF_FORMAT_DIFFSTAT, options,
1629 diffstat);
1630 }
1631 show_stats(diffstat);
1632 free(diffstat);
1633 diffstat = NULL;
1634 putchar(options->line_termination);
1635 }
1636 for (i = 0; i < q->nr; i++) {
1637 struct diff_filepair *p = q->queue[i];
1638 flush_one_pair(p, diff_output_format, options, diffstat);
1639 diff_free_filepair(p);
1640 }
1641
1642 if (diffstat) {
1643 show_stats(diffstat);
1644 free(diffstat);
1645 }
1646
1647 free(q->queue);
1648 q->queue = NULL;
1649 q->nr = q->alloc = 0;
1650 }
1651
1652 static void diffcore_apply_filter(const char *filter)
1653 {
1654 int i;
1655 struct diff_queue_struct *q = &diff_queued_diff;
1656 struct diff_queue_struct outq;
1657 outq.queue = NULL;
1658 outq.nr = outq.alloc = 0;
1659
1660 if (!filter)
1661 return;
1662
1663 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
1664 int found;
1665 for (i = found = 0; !found && i < q->nr; i++) {
1666 struct diff_filepair *p = q->queue[i];
1667 if (((p->status == DIFF_STATUS_MODIFIED) &&
1668 ((p->score &&
1669 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
1670 (!p->score &&
1671 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
1672 ((p->status != DIFF_STATUS_MODIFIED) &&
1673 strchr(filter, p->status)))
1674 found++;
1675 }
1676 if (found)
1677 return;
1678
1679 /* otherwise we will clear the whole queue
1680 * by copying the empty outq at the end of this
1681 * function, but first clear the current entries
1682 * in the queue.
1683 */
1684 for (i = 0; i < q->nr; i++)
1685 diff_free_filepair(q->queue[i]);
1686 }
1687 else {
1688 /* Only the matching ones */
1689 for (i = 0; i < q->nr; i++) {
1690 struct diff_filepair *p = q->queue[i];
1691
1692 if (((p->status == DIFF_STATUS_MODIFIED) &&
1693 ((p->score &&
1694 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
1695 (!p->score &&
1696 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
1697 ((p->status != DIFF_STATUS_MODIFIED) &&
1698 strchr(filter, p->status)))
1699 diff_q(&outq, p);
1700 else
1701 diff_free_filepair(p);
1702 }
1703 }
1704 free(q->queue);
1705 *q = outq;
1706 }
1707
1708 void diffcore_std(struct diff_options *options)
1709 {
1710 if (options->break_opt != -1)
1711 diffcore_break(options->break_opt);
1712 if (options->detect_rename)
1713 diffcore_rename(options);
1714 if (options->break_opt != -1)
1715 diffcore_merge_broken();
1716 if (options->pickaxe)
1717 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
1718 if (options->orderfile)
1719 diffcore_order(options->orderfile);
1720 diff_resolve_rename_copy();
1721 diffcore_apply_filter(options->filter);
1722 }
1723
1724
1725 void diffcore_std_no_resolve(struct diff_options *options)
1726 {
1727 if (options->pickaxe)
1728 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
1729 if (options->orderfile)
1730 diffcore_order(options->orderfile);
1731 diffcore_apply_filter(options->filter);
1732 }
1733
1734 void diff_addremove(struct diff_options *options,
1735 int addremove, unsigned mode,
1736 const unsigned char *sha1,
1737 const char *base, const char *path)
1738 {
1739 char concatpath[PATH_MAX];
1740 struct diff_filespec *one, *two;
1741
1742 /* This may look odd, but it is a preparation for
1743 * feeding "there are unchanged files which should
1744 * not produce diffs, but when you are doing copy
1745 * detection you would need them, so here they are"
1746 * entries to the diff-core. They will be prefixed
1747 * with something like '=' or '*' (I haven't decided
1748 * which but should not make any difference).
1749 * Feeding the same new and old to diff_change()
1750 * also has the same effect.
1751 * Before the final output happens, they are pruned after
1752 * merged into rename/copy pairs as appropriate.
1753 */
1754 if (options->reverse_diff)
1755 addremove = (addremove == '+' ? '-' :
1756 addremove == '-' ? '+' : addremove);
1757
1758 if (!path) path = "";
1759 sprintf(concatpath, "%s%s", base, path);
1760 one = alloc_filespec(concatpath);
1761 two = alloc_filespec(concatpath);
1762
1763 if (addremove != '+')
1764 fill_filespec(one, sha1, mode);
1765 if (addremove != '-')
1766 fill_filespec(two, sha1, mode);
1767
1768 diff_queue(&diff_queued_diff, one, two);
1769 }
1770
1771 void diff_change(struct diff_options *options,
1772 unsigned old_mode, unsigned new_mode,
1773 const unsigned char *old_sha1,
1774 const unsigned char *new_sha1,
1775 const char *base, const char *path)
1776 {
1777 char concatpath[PATH_MAX];
1778 struct diff_filespec *one, *two;
1779
1780 if (options->reverse_diff) {
1781 unsigned tmp;
1782 const unsigned char *tmp_c;
1783 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
1784 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
1785 }
1786 if (!path) path = "";
1787 sprintf(concatpath, "%s%s", base, path);
1788 one = alloc_filespec(concatpath);
1789 two = alloc_filespec(concatpath);
1790 fill_filespec(one, old_sha1, old_mode);
1791 fill_filespec(two, new_sha1, new_mode);
1792
1793 diff_queue(&diff_queued_diff, one, two);
1794 }
1795
1796 void diff_unmerge(struct diff_options *options,
1797 const char *path)
1798 {
1799 struct diff_filespec *one, *two;
1800 one = alloc_filespec(path);
1801 two = alloc_filespec(path);
1802 diff_queue(&diff_queued_diff, one, two);
1803 }
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