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Allow one-way tree merge to remove old files
[git/debian.git] / diff.c
blob7a7b839e56ac1ba2ed0b770a047aaf07bce23722
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 "delta.h"
12 #include "xdiff-interface.h"
13
14 static int use_size_cache;
15
16 int diff_rename_limit_default = -1;
17
18 int git_diff_config(const char *var, const char *value)
19 {
20 if (!strcmp(var, "diff.renamelimit")) {
21 diff_rename_limit_default = git_config_int(var, value);
22 return 0;
23 }
24
25 return git_default_config(var, value);
26 }
27
28 static char *quote_one(const char *str)
29 {
30 int needlen;
31 char *xp;
32
33 if (!str)
34 return NULL;
35 needlen = quote_c_style(str, NULL, NULL, 0);
36 if (!needlen)
37 return strdup(str);
38 xp = xmalloc(needlen + 1);
39 quote_c_style(str, xp, NULL, 0);
40 return xp;
41 }
42
43 static char *quote_two(const char *one, const char *two)
44 {
45 int need_one = quote_c_style(one, NULL, NULL, 1);
46 int need_two = quote_c_style(two, NULL, NULL, 1);
47 char *xp;
48
49 if (need_one + need_two) {
50 if (!need_one) need_one = strlen(one);
51 if (!need_two) need_one = strlen(two);
52
53 xp = xmalloc(need_one + need_two + 3);
54 xp[0] = '"';
55 quote_c_style(one, xp + 1, NULL, 1);
56 quote_c_style(two, xp + need_one + 1, NULL, 1);
57 strcpy(xp + need_one + need_two + 1, "\"");
58 return xp;
59 }
60 need_one = strlen(one);
61 need_two = strlen(two);
62 xp = xmalloc(need_one + need_two + 1);
63 strcpy(xp, one);
64 strcpy(xp + need_one, two);
65 return xp;
66 }
67
68 static const char *external_diff(void)
69 {
70 static const char *external_diff_cmd = NULL;
71 static int done_preparing = 0;
72
73 if (done_preparing)
74 return external_diff_cmd;
75 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
76 done_preparing = 1;
77 return external_diff_cmd;
78 }
79
80 #define TEMPFILE_PATH_LEN 50
81
82 static struct diff_tempfile {
83 const char *name; /* filename external diff should read from */
84 char hex[41];
85 char mode[10];
86 char tmp_path[TEMPFILE_PATH_LEN];
87 } diff_temp[2];
88
89 static int count_lines(const char *data, int size)
90 {
91 int count, ch, completely_empty = 1, nl_just_seen = 0;
92 count = 0;
93 while (0 < size--) {
94 ch = *data++;
95 if (ch == '\n') {
96 count++;
97 nl_just_seen = 1;
98 completely_empty = 0;
99 }
100 else {
101 nl_just_seen = 0;
102 completely_empty = 0;
103 }
104 }
105 if (completely_empty)
106 return 0;
107 if (!nl_just_seen)
108 count++; /* no trailing newline */
109 return count;
110 }
111
112 static void print_line_count(int count)
113 {
114 switch (count) {
115 case 0:
116 printf("0,0");
117 break;
118 case 1:
119 printf("1");
120 break;
121 default:
122 printf("1,%d", count);
123 break;
124 }
125 }
126
127 static void copy_file(int prefix, const char *data, int size)
128 {
129 int ch, nl_just_seen = 1;
130 while (0 < size--) {
131 ch = *data++;
132 if (nl_just_seen)
133 putchar(prefix);
134 putchar(ch);
135 if (ch == '\n')
136 nl_just_seen = 1;
137 else
138 nl_just_seen = 0;
139 }
140 if (!nl_just_seen)
141 printf("\n\\ No newline at end of file\n");
142 }
143
144 static void emit_rewrite_diff(const char *name_a,
145 const char *name_b,
146 struct diff_filespec *one,
147 struct diff_filespec *two)
148 {
149 int lc_a, lc_b;
150 diff_populate_filespec(one, 0);
151 diff_populate_filespec(two, 0);
152 lc_a = count_lines(one->data, one->size);
153 lc_b = count_lines(two->data, two->size);
154 printf("--- %s\n+++ %s\n@@ -", name_a, name_b);
155 print_line_count(lc_a);
156 printf(" +");
157 print_line_count(lc_b);
158 printf(" @@\n");
159 if (lc_a)
160 copy_file('-', one->data, one->size);
161 if (lc_b)
162 copy_file('+', two->data, two->size);
163 }
164
165 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
166 {
167 if (!DIFF_FILE_VALID(one)) {
168 mf->ptr = ""; /* does not matter */
169 mf->size = 0;
170 return 0;
171 }
172 else if (diff_populate_filespec(one, 0))
173 return -1;
174 mf->ptr = one->data;
175 mf->size = one->size;
176 return 0;
177 }
178
179 struct emit_callback {
180 const char **label_path;
181 };
182
183 static int fn_out(void *priv, mmbuffer_t *mb, int nbuf)
184 {
185 int i;
186 struct emit_callback *ecbdata = priv;
187
188 if (ecbdata->label_path[0]) {
189 printf("--- %s\n", ecbdata->label_path[0]);
190 printf("+++ %s\n", ecbdata->label_path[1]);
191 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
192 }
193 for (i = 0; i < nbuf; i++)
194 if (!fwrite(mb[i].ptr, mb[i].size, 1, stdout))
195 return -1;
196 return 0;
197 }
198
199 static char *pprint_rename(const char *a, const char *b)
200 {
201 const char *old = a;
202 const char *new = b;
203 char *name = NULL;
204 int pfx_length, sfx_length;
205 int len_a = strlen(a);
206 int len_b = strlen(b);
207
208 /* Find common prefix */
209 pfx_length = 0;
210 while (*old && *new && *old == *new) {
211 if (*old == '/')
212 pfx_length = old - a + 1;
213 old++;
214 new++;
215 }
216
217 /* Find common suffix */
218 old = a + len_a;
219 new = b + len_b;
220 sfx_length = 0;
221 while (a <= old && b <= new && *old == *new) {
222 if (*old == '/')
223 sfx_length = len_a - (old - a);
224 old--;
225 new--;
226 }
227
228 /*
229 * pfx{mid-a => mid-b}sfx
230 * {pfx-a => pfx-b}sfx
231 * pfx{sfx-a => sfx-b}
232 * name-a => name-b
233 */
234 if (pfx_length + sfx_length) {
235 name = xmalloc(len_a + len_b - pfx_length - sfx_length + 7);
236 sprintf(name, "%.*s{%.*s => %.*s}%s",
237 pfx_length, a,
238 len_a - pfx_length - sfx_length, a + pfx_length,
239 len_b - pfx_length - sfx_length, b + pfx_length,
240 a + len_a - sfx_length);
241 }
242 else {
243 name = xmalloc(len_a + len_b + 5);
244 sprintf(name, "%s => %s", a, b);
245 }
246 return name;
247 }
248
249 struct diffstat_t {
250 struct xdiff_emit_state xm;
251
252 int nr;
253 int alloc;
254 struct diffstat_file {
255 char *name;
256 unsigned is_unmerged:1;
257 unsigned is_binary:1;
258 unsigned is_renamed:1;
259 unsigned int added, deleted;
260 } **files;
261 };
262
263 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
264 const char *name_a,
265 const char *name_b)
266 {
267 struct diffstat_file *x;
268 x = xcalloc(sizeof (*x), 1);
269 if (diffstat->nr == diffstat->alloc) {
270 diffstat->alloc = alloc_nr(diffstat->alloc);
271 diffstat->files = xrealloc(diffstat->files,
272 diffstat->alloc * sizeof(x));
273 }
274 diffstat->files[diffstat->nr++] = x;
275 if (name_b) {
276 x->name = pprint_rename(name_a, name_b);
277 x->is_renamed = 1;
278 }
279 else
280 x->name = strdup(name_a);
281 return x;
282 }
283
284 static void diffstat_consume(void *priv, char *line, unsigned long len)
285 {
286 struct diffstat_t *diffstat = priv;
287 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
288
289 if (line[0] == '+')
290 x->added++;
291 else if (line[0] == '-')
292 x->deleted++;
293 }
294
295 static const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
296 static const char minuses[]= "----------------------------------------------------------------------";
297
298 static void show_stats(struct diffstat_t* data)
299 {
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 *prefix = "";
322 char *name = data->files[i]->name;
323 int added = data->files[i]->added;
324 int deleted = data->files[i]->deleted;
325
326 if (0 < (len = quote_c_style(name, NULL, NULL, 0))) {
327 char *qname = xmalloc(len + 1);
328 quote_c_style(name, qname, NULL, 0);
329 free(name);
330 data->files[i]->name = name = qname;
331 }
332
333 /*
334 * "scale" the filename
335 */
336 len = strlen(name);
337 max = max_len;
338 if (max > 50)
339 max = 50;
340 if (len > max) {
341 char *slash;
342 prefix = "...";
343 max -= 3;
344 name += len - max;
345 slash = strchr(name, '/');
346 if (slash)
347 name = slash;
348 }
349 len = max;
350
351 /*
352 * scale the add/delete
353 */
354 max = max_change;
355 if (max + len > 70)
356 max = 70 - len;
357
358 if (data->files[i]->is_binary) {
359 printf(" %s%-*s | Bin\n", prefix, len, name);
360 goto free_diffstat_file;
361 }
362 else if (data->files[i]->is_unmerged) {
363 printf(" %s%-*s | Unmerged\n", prefix, len, name);
364 goto free_diffstat_file;
365 }
366 else if (!data->files[i]->is_renamed &&
367 (added + deleted == 0)) {
368 total_files--;
369 goto free_diffstat_file;
370 }
371
372 add = added;
373 del = deleted;
374 total = add + del;
375 adds += add;
376 dels += del;
377
378 if (max_change > 0) {
379 total = (total * max + max_change / 2) / max_change;
380 add = (add * max + max_change / 2) / max_change;
381 del = total - add;
382 }
383 printf(" %s%-*s |%5d %.*s%.*s\n", prefix,
384 len, name, added + deleted,
385 add, pluses, del, minuses);
386 free_diffstat_file:
387 free(data->files[i]->name);
388 free(data->files[i]);
389 }
390 free(data->files);
391 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
392 total_files, adds, dels);
393 }
394
395 static unsigned char *deflate_it(char *data,
396 unsigned long size,
397 unsigned long *result_size)
398 {
399 int bound;
400 unsigned char *deflated;
401 z_stream stream;
402
403 memset(&stream, 0, sizeof(stream));
404 deflateInit(&stream, Z_BEST_COMPRESSION);
405 bound = deflateBound(&stream, size);
406 deflated = xmalloc(bound);
407 stream.next_out = deflated;
408 stream.avail_out = bound;
409
410 stream.next_in = (unsigned char *)data;
411 stream.avail_in = size;
412 while (deflate(&stream, Z_FINISH) == Z_OK)
413 ; /* nothing */
414 deflateEnd(&stream);
415 *result_size = stream.total_out;
416 return deflated;
417 }
418
419 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
420 {
421 void *cp;
422 void *delta;
423 void *deflated;
424 void *data;
425 unsigned long orig_size;
426 unsigned long delta_size;
427 unsigned long deflate_size;
428 unsigned long data_size;
429
430 printf("GIT binary patch\n");
431 /* We could do deflated delta, or we could do just deflated two,
432 * whichever is smaller.
433 */
434 delta = NULL;
435 deflated = deflate_it(two->ptr, two->size, &deflate_size);
436 if (one->size && two->size) {
437 delta = diff_delta(one->ptr, one->size,
438 two->ptr, two->size,
439 &delta_size, deflate_size);
440 if (delta) {
441 void *to_free = delta;
442 orig_size = delta_size;
443 delta = deflate_it(delta, delta_size, &delta_size);
444 free(to_free);
445 }
446 }
447
448 if (delta && delta_size < deflate_size) {
449 printf("delta %lu\n", orig_size);
450 free(deflated);
451 data = delta;
452 data_size = delta_size;
453 }
454 else {
455 printf("literal %lu\n", two->size);
456 free(delta);
457 data = deflated;
458 data_size = deflate_size;
459 }
460
461 /* emit data encoded in base85 */
462 cp = data;
463 while (data_size) {
464 int bytes = (52 < data_size) ? 52 : data_size;
465 char line[70];
466 data_size -= bytes;
467 if (bytes <= 26)
468 line[0] = bytes + 'A' - 1;
469 else
470 line[0] = bytes - 26 + 'a' - 1;
471 encode_85(line + 1, cp, bytes);
472 cp += bytes;
473 puts(line);
474 }
475 printf("\n");
476 free(data);
477 }
478
479 #define FIRST_FEW_BYTES 8000
480 static int mmfile_is_binary(mmfile_t *mf)
481 {
482 long sz = mf->size;
483 if (FIRST_FEW_BYTES < sz)
484 sz = FIRST_FEW_BYTES;
485 if (memchr(mf->ptr, 0, sz))
486 return 1;
487 return 0;
488 }
489
490 static void builtin_diff(const char *name_a,
491 const char *name_b,
492 struct diff_filespec *one,
493 struct diff_filespec *two,
494 const char *xfrm_msg,
495 struct diff_options *o,
496 int complete_rewrite)
497 {
498 mmfile_t mf1, mf2;
499 const char *lbl[2];
500 char *a_one, *b_two;
501
502 a_one = quote_two("a/", name_a);
503 b_two = quote_two("b/", name_b);
504 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
505 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
506 printf("diff --git %s %s\n", a_one, b_two);
507 if (lbl[0][0] == '/') {
508 /* /dev/null */
509 printf("new file mode %06o\n", two->mode);
510 if (xfrm_msg && xfrm_msg[0])
511 puts(xfrm_msg);
512 }
513 else if (lbl[1][0] == '/') {
514 printf("deleted file mode %06o\n", one->mode);
515 if (xfrm_msg && xfrm_msg[0])
516 puts(xfrm_msg);
517 }
518 else {
519 if (one->mode != two->mode) {
520 printf("old mode %06o\n", one->mode);
521 printf("new mode %06o\n", two->mode);
522 }
523 if (xfrm_msg && xfrm_msg[0])
524 puts(xfrm_msg);
525 /*
526 * we do not run diff between different kind
527 * of objects.
528 */
529 if ((one->mode ^ two->mode) & S_IFMT)
530 goto free_ab_and_return;
531 if (complete_rewrite) {
532 emit_rewrite_diff(name_a, name_b, one, two);
533 goto free_ab_and_return;
534 }
535 }
536
537 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
538 die("unable to read files to diff");
539
540 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2)) {
541 /* Quite common confusing case */
542 if (mf1.size == mf2.size &&
543 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
544 goto free_ab_and_return;
545 if (o->binary)
546 emit_binary_diff(&mf1, &mf2);
547 else
548 printf("Binary files %s and %s differ\n",
549 lbl[0], lbl[1]);
550 }
551 else {
552 /* Crazy xdl interfaces.. */
553 const char *diffopts = getenv("GIT_DIFF_OPTS");
554 xpparam_t xpp;
555 xdemitconf_t xecfg;
556 xdemitcb_t ecb;
557 struct emit_callback ecbdata;
558
559 ecbdata.label_path = lbl;
560 xpp.flags = XDF_NEED_MINIMAL;
561 xecfg.ctxlen = 3;
562 xecfg.flags = XDL_EMIT_FUNCNAMES;
563 if (!diffopts)
564 ;
565 else if (!strncmp(diffopts, "--unified=", 10))
566 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
567 else if (!strncmp(diffopts, "-u", 2))
568 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
569 ecb.outf = fn_out;
570 ecb.priv = &ecbdata;
571 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
572 }
573
574 free_ab_and_return:
575 free(a_one);
576 free(b_two);
577 return;
578 }
579
580 static void builtin_diffstat(const char *name_a, const char *name_b,
581 struct diff_filespec *one,
582 struct diff_filespec *two,
583 struct diffstat_t *diffstat,
584 int complete_rewrite)
585 {
586 mmfile_t mf1, mf2;
587 struct diffstat_file *data;
588
589 data = diffstat_add(diffstat, name_a, name_b);
590
591 if (!one || !two) {
592 data->is_unmerged = 1;
593 return;
594 }
595 if (complete_rewrite) {
596 diff_populate_filespec(one, 0);
597 diff_populate_filespec(two, 0);
598 data->deleted = count_lines(one->data, one->size);
599 data->added = count_lines(two->data, two->size);
600 return;
601 }
602 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
603 die("unable to read files to diff");
604
605 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
606 data->is_binary = 1;
607 else {
608 /* Crazy xdl interfaces.. */
609 xpparam_t xpp;
610 xdemitconf_t xecfg;
611 xdemitcb_t ecb;
612
613 xpp.flags = XDF_NEED_MINIMAL;
614 xecfg.ctxlen = 0;
615 xecfg.flags = 0;
616 ecb.outf = xdiff_outf;
617 ecb.priv = diffstat;
618 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
619 }
620 }
621
622 struct diff_filespec *alloc_filespec(const char *path)
623 {
624 int namelen = strlen(path);
625 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
626
627 memset(spec, 0, sizeof(*spec));
628 spec->path = (char *)(spec + 1);
629 memcpy(spec->path, path, namelen+1);
630 return spec;
631 }
632
633 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
634 unsigned short mode)
635 {
636 if (mode) {
637 spec->mode = canon_mode(mode);
638 memcpy(spec->sha1, sha1, 20);
639 spec->sha1_valid = !!memcmp(sha1, null_sha1, 20);
640 }
641 }
642
643 /*
644 * Given a name and sha1 pair, if the dircache tells us the file in
645 * the work tree has that object contents, return true, so that
646 * prepare_temp_file() does not have to inflate and extract.
647 */
648 static int work_tree_matches(const char *name, const unsigned char *sha1)
649 {
650 struct cache_entry *ce;
651 struct stat st;
652 int pos, len;
653
654 /* We do not read the cache ourselves here, because the
655 * benchmark with my previous version that always reads cache
656 * shows that it makes things worse for diff-tree comparing
657 * two linux-2.6 kernel trees in an already checked out work
658 * tree. This is because most diff-tree comparisons deal with
659 * only a small number of files, while reading the cache is
660 * expensive for a large project, and its cost outweighs the
661 * savings we get by not inflating the object to a temporary
662 * file. Practically, this code only helps when we are used
663 * by diff-cache --cached, which does read the cache before
664 * calling us.
665 */
666 if (!active_cache)
667 return 0;
668
669 len = strlen(name);
670 pos = cache_name_pos(name, len);
671 if (pos < 0)
672 return 0;
673 ce = active_cache[pos];
674 if ((lstat(name, &st) < 0) ||
675 !S_ISREG(st.st_mode) || /* careful! */
676 ce_match_stat(ce, &st, 0) ||
677 memcmp(sha1, ce->sha1, 20))
678 return 0;
679 /* we return 1 only when we can stat, it is a regular file,
680 * stat information matches, and sha1 recorded in the cache
681 * matches. I.e. we know the file in the work tree really is
682 * the same as the <name, sha1> pair.
683 */
684 return 1;
685 }
686
687 static struct sha1_size_cache {
688 unsigned char sha1[20];
689 unsigned long size;
690 } **sha1_size_cache;
691 static int sha1_size_cache_nr, sha1_size_cache_alloc;
692
693 static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
694 int find_only,
695 unsigned long size)
696 {
697 int first, last;
698 struct sha1_size_cache *e;
699
700 first = 0;
701 last = sha1_size_cache_nr;
702 while (last > first) {
703 int cmp, next = (last + first) >> 1;
704 e = sha1_size_cache[next];
705 cmp = memcmp(e->sha1, sha1, 20);
706 if (!cmp)
707 return e;
708 if (cmp < 0) {
709 last = next;
710 continue;
711 }
712 first = next+1;
713 }
714 /* not found */
715 if (find_only)
716 return NULL;
717 /* insert to make it at "first" */
718 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
719 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
720 sha1_size_cache = xrealloc(sha1_size_cache,
721 sha1_size_cache_alloc *
722 sizeof(*sha1_size_cache));
723 }
724 sha1_size_cache_nr++;
725 if (first < sha1_size_cache_nr)
726 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
727 (sha1_size_cache_nr - first - 1) *
728 sizeof(*sha1_size_cache));
729 e = xmalloc(sizeof(struct sha1_size_cache));
730 sha1_size_cache[first] = e;
731 memcpy(e->sha1, sha1, 20);
732 e->size = size;
733 return e;
734 }
735
736 /*
737 * While doing rename detection and pickaxe operation, we may need to
738 * grab the data for the blob (or file) for our own in-core comparison.
739 * diff_filespec has data and size fields for this purpose.
740 */
741 int diff_populate_filespec(struct diff_filespec *s, int size_only)
742 {
743 int err = 0;
744 if (!DIFF_FILE_VALID(s))
745 die("internal error: asking to populate invalid file.");
746 if (S_ISDIR(s->mode))
747 return -1;
748
749 if (!use_size_cache)
750 size_only = 0;
751
752 if (s->data)
753 return err;
754 if (!s->sha1_valid ||
755 work_tree_matches(s->path, s->sha1)) {
756 struct stat st;
757 int fd;
758 if (lstat(s->path, &st) < 0) {
759 if (errno == ENOENT) {
760 err_empty:
761 err = -1;
762 empty:
763 s->data = "";
764 s->size = 0;
765 return err;
766 }
767 }
768 s->size = st.st_size;
769 if (!s->size)
770 goto empty;
771 if (size_only)
772 return 0;
773 if (S_ISLNK(st.st_mode)) {
774 int ret;
775 s->data = xmalloc(s->size);
776 s->should_free = 1;
777 ret = readlink(s->path, s->data, s->size);
778 if (ret < 0) {
779 free(s->data);
780 goto err_empty;
781 }
782 return 0;
783 }
784 fd = open(s->path, O_RDONLY);
785 if (fd < 0)
786 goto err_empty;
787 s->data = mmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
788 close(fd);
789 if (s->data == MAP_FAILED)
790 goto err_empty;
791 s->should_munmap = 1;
792 }
793 else {
794 char type[20];
795 struct sha1_size_cache *e;
796
797 if (size_only) {
798 e = locate_size_cache(s->sha1, 1, 0);
799 if (e) {
800 s->size = e->size;
801 return 0;
802 }
803 if (!sha1_object_info(s->sha1, type, &s->size))
804 locate_size_cache(s->sha1, 0, s->size);
805 }
806 else {
807 s->data = read_sha1_file(s->sha1, type, &s->size);
808 s->should_free = 1;
809 }
810 }
811 return 0;
812 }
813
814 void diff_free_filespec_data(struct diff_filespec *s)
815 {
816 if (s->should_free)
817 free(s->data);
818 else if (s->should_munmap)
819 munmap(s->data, s->size);
820 s->should_free = s->should_munmap = 0;
821 s->data = NULL;
822 free(s->cnt_data);
823 s->cnt_data = NULL;
824 }
825
826 static void prep_temp_blob(struct diff_tempfile *temp,
827 void *blob,
828 unsigned long size,
829 const unsigned char *sha1,
830 int mode)
831 {
832 int fd;
833
834 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
835 if (fd < 0)
836 die("unable to create temp-file");
837 if (write(fd, blob, size) != size)
838 die("unable to write temp-file");
839 close(fd);
840 temp->name = temp->tmp_path;
841 strcpy(temp->hex, sha1_to_hex(sha1));
842 temp->hex[40] = 0;
843 sprintf(temp->mode, "%06o", mode);
844 }
845
846 static void prepare_temp_file(const char *name,
847 struct diff_tempfile *temp,
848 struct diff_filespec *one)
849 {
850 if (!DIFF_FILE_VALID(one)) {
851 not_a_valid_file:
852 /* A '-' entry produces this for file-2, and
853 * a '+' entry produces this for file-1.
854 */
855 temp->name = "/dev/null";
856 strcpy(temp->hex, ".");
857 strcpy(temp->mode, ".");
858 return;
859 }
860
861 if (!one->sha1_valid ||
862 work_tree_matches(name, one->sha1)) {
863 struct stat st;
864 if (lstat(name, &st) < 0) {
865 if (errno == ENOENT)
866 goto not_a_valid_file;
867 die("stat(%s): %s", name, strerror(errno));
868 }
869 if (S_ISLNK(st.st_mode)) {
870 int ret;
871 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
872 if (sizeof(buf) <= st.st_size)
873 die("symlink too long: %s", name);
874 ret = readlink(name, buf, st.st_size);
875 if (ret < 0)
876 die("readlink(%s)", name);
877 prep_temp_blob(temp, buf, st.st_size,
878 (one->sha1_valid ?
879 one->sha1 : null_sha1),
880 (one->sha1_valid ?
881 one->mode : S_IFLNK));
882 }
883 else {
884 /* we can borrow from the file in the work tree */
885 temp->name = name;
886 if (!one->sha1_valid)
887 strcpy(temp->hex, sha1_to_hex(null_sha1));
888 else
889 strcpy(temp->hex, sha1_to_hex(one->sha1));
890 /* Even though we may sometimes borrow the
891 * contents from the work tree, we always want
892 * one->mode. mode is trustworthy even when
893 * !(one->sha1_valid), as long as
894 * DIFF_FILE_VALID(one).
895 */
896 sprintf(temp->mode, "%06o", one->mode);
897 }
898 return;
899 }
900 else {
901 if (diff_populate_filespec(one, 0))
902 die("cannot read data blob for %s", one->path);
903 prep_temp_blob(temp, one->data, one->size,
904 one->sha1, one->mode);
905 }
906 }
907
908 static void remove_tempfile(void)
909 {
910 int i;
911
912 for (i = 0; i < 2; i++)
913 if (diff_temp[i].name == diff_temp[i].tmp_path) {
914 unlink(diff_temp[i].name);
915 diff_temp[i].name = NULL;
916 }
917 }
918
919 static void remove_tempfile_on_signal(int signo)
920 {
921 remove_tempfile();
922 signal(SIGINT, SIG_DFL);
923 raise(signo);
924 }
925
926 static int spawn_prog(const char *pgm, const char **arg)
927 {
928 pid_t pid;
929 int status;
930
931 fflush(NULL);
932 pid = fork();
933 if (pid < 0)
934 die("unable to fork");
935 if (!pid) {
936 execvp(pgm, (char *const*) arg);
937 exit(255);
938 }
939
940 while (waitpid(pid, &status, 0) < 0) {
941 if (errno == EINTR)
942 continue;
943 return -1;
944 }
945
946 /* Earlier we did not check the exit status because
947 * diff exits non-zero if files are different, and
948 * we are not interested in knowing that. It was a
949 * mistake which made it harder to quit a diff-*
950 * session that uses the git-apply-patch-script as
951 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
952 * should also exit non-zero only when it wants to
953 * abort the entire diff-* session.
954 */
955 if (WIFEXITED(status) && !WEXITSTATUS(status))
956 return 0;
957 return -1;
958 }
959
960 /* An external diff command takes:
961 *
962 * diff-cmd name infile1 infile1-sha1 infile1-mode \
963 * infile2 infile2-sha1 infile2-mode [ rename-to ]
964 *
965 */
966 static void run_external_diff(const char *pgm,
967 const char *name,
968 const char *other,
969 struct diff_filespec *one,
970 struct diff_filespec *two,
971 const char *xfrm_msg,
972 int complete_rewrite)
973 {
974 const char *spawn_arg[10];
975 struct diff_tempfile *temp = diff_temp;
976 int retval;
977 static int atexit_asked = 0;
978 const char *othername;
979 const char **arg = &spawn_arg[0];
980
981 othername = (other? other : name);
982 if (one && two) {
983 prepare_temp_file(name, &temp[0], one);
984 prepare_temp_file(othername, &temp[1], two);
985 if (! atexit_asked &&
986 (temp[0].name == temp[0].tmp_path ||
987 temp[1].name == temp[1].tmp_path)) {
988 atexit_asked = 1;
989 atexit(remove_tempfile);
990 }
991 signal(SIGINT, remove_tempfile_on_signal);
992 }
993
994 if (one && two) {
995 *arg++ = pgm;
996 *arg++ = name;
997 *arg++ = temp[0].name;
998 *arg++ = temp[0].hex;
999 *arg++ = temp[0].mode;
1000 *arg++ = temp[1].name;
1001 *arg++ = temp[1].hex;
1002 *arg++ = temp[1].mode;
1003 if (other) {
1004 *arg++ = other;
1005 *arg++ = xfrm_msg;
1006 }
1007 } else {
1008 *arg++ = pgm;
1009 *arg++ = name;
1010 }
1011 *arg = NULL;
1012 retval = spawn_prog(pgm, spawn_arg);
1013 remove_tempfile();
1014 if (retval) {
1015 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1016 exit(1);
1017 }
1018 }
1019
1020 static void run_diff_cmd(const char *pgm,
1021 const char *name,
1022 const char *other,
1023 struct diff_filespec *one,
1024 struct diff_filespec *two,
1025 const char *xfrm_msg,
1026 struct diff_options *o,
1027 int complete_rewrite)
1028 {
1029 if (pgm) {
1030 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1031 complete_rewrite);
1032 return;
1033 }
1034 if (one && two)
1035 builtin_diff(name, other ? other : name,
1036 one, two, xfrm_msg, o, complete_rewrite);
1037 else
1038 printf("* Unmerged path %s\n", name);
1039 }
1040
1041 static void diff_fill_sha1_info(struct diff_filespec *one)
1042 {
1043 if (DIFF_FILE_VALID(one)) {
1044 if (!one->sha1_valid) {
1045 struct stat st;
1046 if (lstat(one->path, &st) < 0)
1047 die("stat %s", one->path);
1048 if (index_path(one->sha1, one->path, &st, 0))
1049 die("cannot hash %s\n", one->path);
1050 }
1051 }
1052 else
1053 memset(one->sha1, 0, 20);
1054 }
1055
1056 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1057 {
1058 const char *pgm = external_diff();
1059 char msg[PATH_MAX*2+300], *xfrm_msg;
1060 struct diff_filespec *one;
1061 struct diff_filespec *two;
1062 const char *name;
1063 const char *other;
1064 char *name_munged, *other_munged;
1065 int complete_rewrite = 0;
1066 int len;
1067
1068 if (DIFF_PAIR_UNMERGED(p)) {
1069 /* unmerged */
1070 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1071 return;
1072 }
1073
1074 name = p->one->path;
1075 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1076 name_munged = quote_one(name);
1077 other_munged = quote_one(other);
1078 one = p->one; two = p->two;
1079
1080 diff_fill_sha1_info(one);
1081 diff_fill_sha1_info(two);
1082
1083 len = 0;
1084 switch (p->status) {
1085 case DIFF_STATUS_COPIED:
1086 len += snprintf(msg + len, sizeof(msg) - len,
1087 "similarity index %d%%\n"
1088 "copy from %s\n"
1089 "copy to %s\n",
1090 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1091 name_munged, other_munged);
1092 break;
1093 case DIFF_STATUS_RENAMED:
1094 len += snprintf(msg + len, sizeof(msg) - len,
1095 "similarity index %d%%\n"
1096 "rename from %s\n"
1097 "rename to %s\n",
1098 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1099 name_munged, other_munged);
1100 break;
1101 case DIFF_STATUS_MODIFIED:
1102 if (p->score) {
1103 len += snprintf(msg + len, sizeof(msg) - len,
1104 "dissimilarity index %d%%\n",
1105 (int)(0.5 + p->score *
1106 100.0/MAX_SCORE));
1107 complete_rewrite = 1;
1108 break;
1109 }
1110 /* fallthru */
1111 default:
1112 /* nothing */
1113 ;
1114 }
1115
1116 if (memcmp(one->sha1, two->sha1, 20)) {
1117 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1118
1119 len += snprintf(msg + len, sizeof(msg) - len,
1120 "index %.*s..%.*s",
1121 abbrev, sha1_to_hex(one->sha1),
1122 abbrev, sha1_to_hex(two->sha1));
1123 if (one->mode == two->mode)
1124 len += snprintf(msg + len, sizeof(msg) - len,
1125 " %06o", one->mode);
1126 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1127 }
1128
1129 if (len)
1130 msg[--len] = 0;
1131 xfrm_msg = len ? msg : NULL;
1132
1133 if (!pgm &&
1134 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1135 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1136 /* a filepair that changes between file and symlink
1137 * needs to be split into deletion and creation.
1138 */
1139 struct diff_filespec *null = alloc_filespec(two->path);
1140 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1141 free(null);
1142 null = alloc_filespec(one->path);
1143 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1144 free(null);
1145 }
1146 else
1147 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1148 complete_rewrite);
1149
1150 free(name_munged);
1151 free(other_munged);
1152 }
1153
1154 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1155 struct diffstat_t *diffstat)
1156 {
1157 const char *name;
1158 const char *other;
1159 int complete_rewrite = 0;
1160
1161 if (DIFF_PAIR_UNMERGED(p)) {
1162 /* unmerged */
1163 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, 0);
1164 return;
1165 }
1166
1167 name = p->one->path;
1168 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1169
1170 diff_fill_sha1_info(p->one);
1171 diff_fill_sha1_info(p->two);
1172
1173 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1174 complete_rewrite = 1;
1175 builtin_diffstat(name, other, p->one, p->two, diffstat, complete_rewrite);
1176 }
1177
1178 void diff_setup(struct diff_options *options)
1179 {
1180 memset(options, 0, sizeof(*options));
1181 options->output_format = DIFF_FORMAT_RAW;
1182 options->line_termination = '\n';
1183 options->break_opt = -1;
1184 options->rename_limit = -1;
1185
1186 options->change = diff_change;
1187 options->add_remove = diff_addremove;
1188 }
1189
1190 int diff_setup_done(struct diff_options *options)
1191 {
1192 if ((options->find_copies_harder &&
1193 options->detect_rename != DIFF_DETECT_COPY) ||
1194 (0 <= options->rename_limit && !options->detect_rename))
1195 return -1;
1196
1197 /*
1198 * These cases always need recursive; we do not drop caller-supplied
1199 * recursive bits for other formats here.
1200 */
1201 if ((options->output_format == DIFF_FORMAT_PATCH) ||
1202 (options->output_format == DIFF_FORMAT_DIFFSTAT))
1203 options->recursive = 1;
1204
1205 if (options->detect_rename && options->rename_limit < 0)
1206 options->rename_limit = diff_rename_limit_default;
1207 if (options->setup & DIFF_SETUP_USE_CACHE) {
1208 if (!active_cache)
1209 /* read-cache does not die even when it fails
1210 * so it is safe for us to do this here. Also
1211 * it does not smudge active_cache or active_nr
1212 * when it fails, so we do not have to worry about
1213 * cleaning it up ourselves either.
1214 */
1215 read_cache();
1216 }
1217 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
1218 use_size_cache = 1;
1219 if (options->abbrev <= 0 || 40 < options->abbrev)
1220 options->abbrev = 40; /* full */
1221
1222 return 0;
1223 }
1224
1225 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
1226 {
1227 const char *arg = av[0];
1228 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
1229 options->output_format = DIFF_FORMAT_PATCH;
1230 else if (!strcmp(arg, "--patch-with-raw")) {
1231 options->output_format = DIFF_FORMAT_PATCH;
1232 options->with_raw = 1;
1233 }
1234 else if (!strcmp(arg, "--stat"))
1235 options->output_format = DIFF_FORMAT_DIFFSTAT;
1236 else if (!strcmp(arg, "--patch-with-stat")) {
1237 options->output_format = DIFF_FORMAT_PATCH;
1238 options->with_stat = 1;
1239 }
1240 else if (!strcmp(arg, "-z"))
1241 options->line_termination = 0;
1242 else if (!strncmp(arg, "-l", 2))
1243 options->rename_limit = strtoul(arg+2, NULL, 10);
1244 else if (!strcmp(arg, "--full-index"))
1245 options->full_index = 1;
1246 else if (!strcmp(arg, "--binary")) {
1247 options->output_format = DIFF_FORMAT_PATCH;
1248 options->full_index = options->binary = 1;
1249 }
1250 else if (!strcmp(arg, "--name-only"))
1251 options->output_format = DIFF_FORMAT_NAME;
1252 else if (!strcmp(arg, "--name-status"))
1253 options->output_format = DIFF_FORMAT_NAME_STATUS;
1254 else if (!strcmp(arg, "-R"))
1255 options->reverse_diff = 1;
1256 else if (!strncmp(arg, "-S", 2))
1257 options->pickaxe = arg + 2;
1258 else if (!strcmp(arg, "-s"))
1259 options->output_format = DIFF_FORMAT_NO_OUTPUT;
1260 else if (!strncmp(arg, "-O", 2))
1261 options->orderfile = arg + 2;
1262 else if (!strncmp(arg, "--diff-filter=", 14))
1263 options->filter = arg + 14;
1264 else if (!strcmp(arg, "--pickaxe-all"))
1265 options->pickaxe_opts = DIFF_PICKAXE_ALL;
1266 else if (!strcmp(arg, "--pickaxe-regex"))
1267 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
1268 else if (!strncmp(arg, "-B", 2)) {
1269 if ((options->break_opt =
1270 diff_scoreopt_parse(arg)) == -1)
1271 return -1;
1272 }
1273 else if (!strncmp(arg, "-M", 2)) {
1274 if ((options->rename_score =
1275 diff_scoreopt_parse(arg)) == -1)
1276 return -1;
1277 options->detect_rename = DIFF_DETECT_RENAME;
1278 }
1279 else if (!strncmp(arg, "-C", 2)) {
1280 if ((options->rename_score =
1281 diff_scoreopt_parse(arg)) == -1)
1282 return -1;
1283 options->detect_rename = DIFF_DETECT_COPY;
1284 }
1285 else if (!strcmp(arg, "--find-copies-harder"))
1286 options->find_copies_harder = 1;
1287 else if (!strcmp(arg, "--abbrev"))
1288 options->abbrev = DEFAULT_ABBREV;
1289 else if (!strncmp(arg, "--abbrev=", 9)) {
1290 options->abbrev = strtoul(arg + 9, NULL, 10);
1291 if (options->abbrev < MINIMUM_ABBREV)
1292 options->abbrev = MINIMUM_ABBREV;
1293 else if (40 < options->abbrev)
1294 options->abbrev = 40;
1295 }
1296 else
1297 return 0;
1298 return 1;
1299 }
1300
1301 static int parse_num(const char **cp_p)
1302 {
1303 unsigned long num, scale;
1304 int ch, dot;
1305 const char *cp = *cp_p;
1306
1307 num = 0;
1308 scale = 1;
1309 dot = 0;
1310 for(;;) {
1311 ch = *cp;
1312 if ( !dot && ch == '.' ) {
1313 scale = 1;
1314 dot = 1;
1315 } else if ( ch == '%' ) {
1316 scale = dot ? scale*100 : 100;
1317 cp++; /* % is always at the end */
1318 break;
1319 } else if ( ch >= '0' && ch <= '9' ) {
1320 if ( scale < 100000 ) {
1321 scale *= 10;
1322 num = (num*10) + (ch-'0');
1323 }
1324 } else {
1325 break;
1326 }
1327 cp++;
1328 }
1329 *cp_p = cp;
1330
1331 /* user says num divided by scale and we say internally that
1332 * is MAX_SCORE * num / scale.
1333 */
1334 return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
1335 }
1336
1337 int diff_scoreopt_parse(const char *opt)
1338 {
1339 int opt1, opt2, cmd;
1340
1341 if (*opt++ != '-')
1342 return -1;
1343 cmd = *opt++;
1344 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
1345 return -1; /* that is not a -M, -C nor -B option */
1346
1347 opt1 = parse_num(&opt);
1348 if (cmd != 'B')
1349 opt2 = 0;
1350 else {
1351 if (*opt == 0)
1352 opt2 = 0;
1353 else if (*opt != '/')
1354 return -1; /* we expect -B80/99 or -B80 */
1355 else {
1356 opt++;
1357 opt2 = parse_num(&opt);
1358 }
1359 }
1360 if (*opt != 0)
1361 return -1;
1362 return opt1 | (opt2 << 16);
1363 }
1364
1365 struct diff_queue_struct diff_queued_diff;
1366
1367 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
1368 {
1369 if (queue->alloc <= queue->nr) {
1370 queue->alloc = alloc_nr(queue->alloc);
1371 queue->queue = xrealloc(queue->queue,
1372 sizeof(dp) * queue->alloc);
1373 }
1374 queue->queue[queue->nr++] = dp;
1375 }
1376
1377 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
1378 struct diff_filespec *one,
1379 struct diff_filespec *two)
1380 {
1381 struct diff_filepair *dp = xmalloc(sizeof(*dp));
1382 dp->one = one;
1383 dp->two = two;
1384 dp->score = 0;
1385 dp->status = 0;
1386 dp->source_stays = 0;
1387 dp->broken_pair = 0;
1388 if (queue)
1389 diff_q(queue, dp);
1390 return dp;
1391 }
1392
1393 void diff_free_filepair(struct diff_filepair *p)
1394 {
1395 diff_free_filespec_data(p->one);
1396 diff_free_filespec_data(p->two);
1397 free(p->one);
1398 free(p->two);
1399 free(p);
1400 }
1401
1402 /* This is different from find_unique_abbrev() in that
1403 * it stuffs the result with dots for alignment.
1404 */
1405 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
1406 {
1407 int abblen;
1408 const char *abbrev;
1409 if (len == 40)
1410 return sha1_to_hex(sha1);
1411
1412 abbrev = find_unique_abbrev(sha1, len);
1413 if (!abbrev)
1414 return sha1_to_hex(sha1);
1415 abblen = strlen(abbrev);
1416 if (abblen < 37) {
1417 static char hex[41];
1418 if (len < abblen && abblen <= len + 2)
1419 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
1420 else
1421 sprintf(hex, "%s...", abbrev);
1422 return hex;
1423 }
1424 return sha1_to_hex(sha1);
1425 }
1426
1427 static void diff_flush_raw(struct diff_filepair *p,
1428 int line_termination,
1429 int inter_name_termination,
1430 struct diff_options *options,
1431 int output_format)
1432 {
1433 int two_paths;
1434 char status[10];
1435 int abbrev = options->abbrev;
1436 const char *path_one, *path_two;
1437
1438 path_one = p->one->path;
1439 path_two = p->two->path;
1440 if (line_termination) {
1441 path_one = quote_one(path_one);
1442 path_two = quote_one(path_two);
1443 }
1444
1445 if (p->score)
1446 sprintf(status, "%c%03d", p->status,
1447 (int)(0.5 + p->score * 100.0/MAX_SCORE));
1448 else {
1449 status[0] = p->status;
1450 status[1] = 0;
1451 }
1452 switch (p->status) {
1453 case DIFF_STATUS_COPIED:
1454 case DIFF_STATUS_RENAMED:
1455 two_paths = 1;
1456 break;
1457 case DIFF_STATUS_ADDED:
1458 case DIFF_STATUS_DELETED:
1459 two_paths = 0;
1460 break;
1461 default:
1462 two_paths = 0;
1463 break;
1464 }
1465 if (output_format != DIFF_FORMAT_NAME_STATUS) {
1466 printf(":%06o %06o %s ",
1467 p->one->mode, p->two->mode,
1468 diff_unique_abbrev(p->one->sha1, abbrev));
1469 printf("%s ",
1470 diff_unique_abbrev(p->two->sha1, abbrev));
1471 }
1472 printf("%s%c%s", status, inter_name_termination, path_one);
1473 if (two_paths)
1474 printf("%c%s", inter_name_termination, path_two);
1475 putchar(line_termination);
1476 if (path_one != p->one->path)
1477 free((void*)path_one);
1478 if (path_two != p->two->path)
1479 free((void*)path_two);
1480 }
1481
1482 static void diff_flush_name(struct diff_filepair *p,
1483 int inter_name_termination,
1484 int line_termination)
1485 {
1486 char *path = p->two->path;
1487
1488 if (line_termination)
1489 path = quote_one(p->two->path);
1490 else
1491 path = p->two->path;
1492 printf("%s%c", path, line_termination);
1493 if (p->two->path != path)
1494 free(path);
1495 }
1496
1497 int diff_unmodified_pair(struct diff_filepair *p)
1498 {
1499 /* This function is written stricter than necessary to support
1500 * the currently implemented transformers, but the idea is to
1501 * let transformers to produce diff_filepairs any way they want,
1502 * and filter and clean them up here before producing the output.
1503 */
1504 struct diff_filespec *one, *two;
1505
1506 if (DIFF_PAIR_UNMERGED(p))
1507 return 0; /* unmerged is interesting */
1508
1509 one = p->one;
1510 two = p->two;
1511
1512 /* deletion, addition, mode or type change
1513 * and rename are all interesting.
1514 */
1515 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
1516 DIFF_PAIR_MODE_CHANGED(p) ||
1517 strcmp(one->path, two->path))
1518 return 0;
1519
1520 /* both are valid and point at the same path. that is, we are
1521 * dealing with a change.
1522 */
1523 if (one->sha1_valid && two->sha1_valid &&
1524 !memcmp(one->sha1, two->sha1, sizeof(one->sha1)))
1525 return 1; /* no change */
1526 if (!one->sha1_valid && !two->sha1_valid)
1527 return 1; /* both look at the same file on the filesystem. */
1528 return 0;
1529 }
1530
1531 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
1532 {
1533 if (diff_unmodified_pair(p))
1534 return;
1535
1536 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1537 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1538 return; /* no tree diffs in patch format */
1539
1540 run_diff(p, o);
1541 }
1542
1543 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
1544 struct diffstat_t *diffstat)
1545 {
1546 if (diff_unmodified_pair(p))
1547 return;
1548
1549 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1550 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1551 return; /* no tree diffs in patch format */
1552
1553 run_diffstat(p, o, diffstat);
1554 }
1555
1556 int diff_queue_is_empty(void)
1557 {
1558 struct diff_queue_struct *q = &diff_queued_diff;
1559 int i;
1560 for (i = 0; i < q->nr; i++)
1561 if (!diff_unmodified_pair(q->queue[i]))
1562 return 0;
1563 return 1;
1564 }
1565
1566 #if DIFF_DEBUG
1567 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
1568 {
1569 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
1570 x, one ? one : "",
1571 s->path,
1572 DIFF_FILE_VALID(s) ? "valid" : "invalid",
1573 s->mode,
1574 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
1575 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
1576 x, one ? one : "",
1577 s->size, s->xfrm_flags);
1578 }
1579
1580 void diff_debug_filepair(const struct diff_filepair *p, int i)
1581 {
1582 diff_debug_filespec(p->one, i, "one");
1583 diff_debug_filespec(p->two, i, "two");
1584 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
1585 p->score, p->status ? p->status : '?',
1586 p->source_stays, p->broken_pair);
1587 }
1588
1589 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
1590 {
1591 int i;
1592 if (msg)
1593 fprintf(stderr, "%s\n", msg);
1594 fprintf(stderr, "q->nr = %d\n", q->nr);
1595 for (i = 0; i < q->nr; i++) {
1596 struct diff_filepair *p = q->queue[i];
1597 diff_debug_filepair(p, i);
1598 }
1599 }
1600 #endif
1601
1602 static void diff_resolve_rename_copy(void)
1603 {
1604 int i, j;
1605 struct diff_filepair *p, *pp;
1606 struct diff_queue_struct *q = &diff_queued_diff;
1607
1608 diff_debug_queue("resolve-rename-copy", q);
1609
1610 for (i = 0; i < q->nr; i++) {
1611 p = q->queue[i];
1612 p->status = 0; /* undecided */
1613 if (DIFF_PAIR_UNMERGED(p))
1614 p->status = DIFF_STATUS_UNMERGED;
1615 else if (!DIFF_FILE_VALID(p->one))
1616 p->status = DIFF_STATUS_ADDED;
1617 else if (!DIFF_FILE_VALID(p->two))
1618 p->status = DIFF_STATUS_DELETED;
1619 else if (DIFF_PAIR_TYPE_CHANGED(p))
1620 p->status = DIFF_STATUS_TYPE_CHANGED;
1621
1622 /* from this point on, we are dealing with a pair
1623 * whose both sides are valid and of the same type, i.e.
1624 * either in-place edit or rename/copy edit.
1625 */
1626 else if (DIFF_PAIR_RENAME(p)) {
1627 if (p->source_stays) {
1628 p->status = DIFF_STATUS_COPIED;
1629 continue;
1630 }
1631 /* See if there is some other filepair that
1632 * copies from the same source as us. If so
1633 * we are a copy. Otherwise we are either a
1634 * copy if the path stays, or a rename if it
1635 * does not, but we already handled "stays" case.
1636 */
1637 for (j = i + 1; j < q->nr; j++) {
1638 pp = q->queue[j];
1639 if (strcmp(pp->one->path, p->one->path))
1640 continue; /* not us */
1641 if (!DIFF_PAIR_RENAME(pp))
1642 continue; /* not a rename/copy */
1643 /* pp is a rename/copy from the same source */
1644 p->status = DIFF_STATUS_COPIED;
1645 break;
1646 }
1647 if (!p->status)
1648 p->status = DIFF_STATUS_RENAMED;
1649 }
1650 else if (memcmp(p->one->sha1, p->two->sha1, 20) ||
1651 p->one->mode != p->two->mode)
1652 p->status = DIFF_STATUS_MODIFIED;
1653 else {
1654 /* This is a "no-change" entry and should not
1655 * happen anymore, but prepare for broken callers.
1656 */
1657 error("feeding unmodified %s to diffcore",
1658 p->one->path);
1659 p->status = DIFF_STATUS_UNKNOWN;
1660 }
1661 }
1662 diff_debug_queue("resolve-rename-copy done", q);
1663 }
1664
1665 static void flush_one_pair(struct diff_filepair *p,
1666 int diff_output_format,
1667 struct diff_options *options,
1668 struct diffstat_t *diffstat)
1669 {
1670 int inter_name_termination = '\t';
1671 int line_termination = options->line_termination;
1672 if (!line_termination)
1673 inter_name_termination = 0;
1674
1675 switch (p->status) {
1676 case DIFF_STATUS_UNKNOWN:
1677 break;
1678 case 0:
1679 die("internal error in diff-resolve-rename-copy");
1680 break;
1681 default:
1682 switch (diff_output_format) {
1683 case DIFF_FORMAT_DIFFSTAT:
1684 diff_flush_stat(p, options, diffstat);
1685 break;
1686 case DIFF_FORMAT_PATCH:
1687 diff_flush_patch(p, options);
1688 break;
1689 case DIFF_FORMAT_RAW:
1690 case DIFF_FORMAT_NAME_STATUS:
1691 diff_flush_raw(p, line_termination,
1692 inter_name_termination,
1693 options, diff_output_format);
1694 break;
1695 case DIFF_FORMAT_NAME:
1696 diff_flush_name(p,
1697 inter_name_termination,
1698 line_termination);
1699 break;
1700 case DIFF_FORMAT_NO_OUTPUT:
1701 break;
1702 }
1703 }
1704 }
1705
1706 void diff_flush(struct diff_options *options)
1707 {
1708 struct diff_queue_struct *q = &diff_queued_diff;
1709 int i;
1710 int diff_output_format = options->output_format;
1711 struct diffstat_t *diffstat = NULL;
1712
1713 if (diff_output_format == DIFF_FORMAT_DIFFSTAT || options->with_stat) {
1714 diffstat = xcalloc(sizeof (struct diffstat_t), 1);
1715 diffstat->xm.consume = diffstat_consume;
1716 }
1717
1718 if (options->with_raw) {
1719 for (i = 0; i < q->nr; i++) {
1720 struct diff_filepair *p = q->queue[i];
1721 flush_one_pair(p, DIFF_FORMAT_RAW, options, NULL);
1722 }
1723 putchar(options->line_termination);
1724 }
1725 if (options->with_stat) {
1726 for (i = 0; i < q->nr; i++) {
1727 struct diff_filepair *p = q->queue[i];
1728 flush_one_pair(p, DIFF_FORMAT_DIFFSTAT, options,
1729 diffstat);
1730 }
1731 show_stats(diffstat);
1732 free(diffstat);
1733 diffstat = NULL;
1734 putchar(options->line_termination);
1735 }
1736 for (i = 0; i < q->nr; i++) {
1737 struct diff_filepair *p = q->queue[i];
1738 flush_one_pair(p, diff_output_format, options, diffstat);
1739 diff_free_filepair(p);
1740 }
1741
1742 if (diffstat) {
1743 show_stats(diffstat);
1744 free(diffstat);
1745 }
1746
1747 free(q->queue);
1748 q->queue = NULL;
1749 q->nr = q->alloc = 0;
1750 }
1751
1752 static void diffcore_apply_filter(const char *filter)
1753 {
1754 int i;
1755 struct diff_queue_struct *q = &diff_queued_diff;
1756 struct diff_queue_struct outq;
1757 outq.queue = NULL;
1758 outq.nr = outq.alloc = 0;
1759
1760 if (!filter)
1761 return;
1762
1763 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
1764 int found;
1765 for (i = found = 0; !found && i < q->nr; i++) {
1766 struct diff_filepair *p = q->queue[i];
1767 if (((p->status == DIFF_STATUS_MODIFIED) &&
1768 ((p->score &&
1769 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
1770 (!p->score &&
1771 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
1772 ((p->status != DIFF_STATUS_MODIFIED) &&
1773 strchr(filter, p->status)))
1774 found++;
1775 }
1776 if (found)
1777 return;
1778
1779 /* otherwise we will clear the whole queue
1780 * by copying the empty outq at the end of this
1781 * function, but first clear the current entries
1782 * in the queue.
1783 */
1784 for (i = 0; i < q->nr; i++)
1785 diff_free_filepair(q->queue[i]);
1786 }
1787 else {
1788 /* Only the matching ones */
1789 for (i = 0; i < q->nr; i++) {
1790 struct diff_filepair *p = q->queue[i];
1791
1792 if (((p->status == DIFF_STATUS_MODIFIED) &&
1793 ((p->score &&
1794 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
1795 (!p->score &&
1796 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
1797 ((p->status != DIFF_STATUS_MODIFIED) &&
1798 strchr(filter, p->status)))
1799 diff_q(&outq, p);
1800 else
1801 diff_free_filepair(p);
1802 }
1803 }
1804 free(q->queue);
1805 *q = outq;
1806 }
1807
1808 void diffcore_std(struct diff_options *options)
1809 {
1810 if (options->break_opt != -1)
1811 diffcore_break(options->break_opt);
1812 if (options->detect_rename)
1813 diffcore_rename(options);
1814 if (options->break_opt != -1)
1815 diffcore_merge_broken();
1816 if (options->pickaxe)
1817 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
1818 if (options->orderfile)
1819 diffcore_order(options->orderfile);
1820 diff_resolve_rename_copy();
1821 diffcore_apply_filter(options->filter);
1822 }
1823
1824
1825 void diffcore_std_no_resolve(struct diff_options *options)
1826 {
1827 if (options->pickaxe)
1828 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
1829 if (options->orderfile)
1830 diffcore_order(options->orderfile);
1831 diffcore_apply_filter(options->filter);
1832 }
1833
1834 void diff_addremove(struct diff_options *options,
1835 int addremove, unsigned mode,
1836 const unsigned char *sha1,
1837 const char *base, const char *path)
1838 {
1839 char concatpath[PATH_MAX];
1840 struct diff_filespec *one, *two;
1841
1842 /* This may look odd, but it is a preparation for
1843 * feeding "there are unchanged files which should
1844 * not produce diffs, but when you are doing copy
1845 * detection you would need them, so here they are"
1846 * entries to the diff-core. They will be prefixed
1847 * with something like '=' or '*' (I haven't decided
1848 * which but should not make any difference).
1849 * Feeding the same new and old to diff_change()
1850 * also has the same effect.
1851 * Before the final output happens, they are pruned after
1852 * merged into rename/copy pairs as appropriate.
1853 */
1854 if (options->reverse_diff)
1855 addremove = (addremove == '+' ? '-' :
1856 addremove == '-' ? '+' : addremove);
1857
1858 if (!path) path = "";
1859 sprintf(concatpath, "%s%s", base, path);
1860 one = alloc_filespec(concatpath);
1861 two = alloc_filespec(concatpath);
1862
1863 if (addremove != '+')
1864 fill_filespec(one, sha1, mode);
1865 if (addremove != '-')
1866 fill_filespec(two, sha1, mode);
1867
1868 diff_queue(&diff_queued_diff, one, two);
1869 }
1870
1871 void diff_change(struct diff_options *options,
1872 unsigned old_mode, unsigned new_mode,
1873 const unsigned char *old_sha1,
1874 const unsigned char *new_sha1,
1875 const char *base, const char *path)
1876 {
1877 char concatpath[PATH_MAX];
1878 struct diff_filespec *one, *two;
1879
1880 if (options->reverse_diff) {
1881 unsigned tmp;
1882 const unsigned char *tmp_c;
1883 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
1884 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
1885 }
1886 if (!path) path = "";
1887 sprintf(concatpath, "%s%s", base, path);
1888 one = alloc_filespec(concatpath);
1889 two = alloc_filespec(concatpath);
1890 fill_filespec(one, old_sha1, old_mode);
1891 fill_filespec(two, new_sha1, new_mode);
1892
1893 diff_queue(&diff_queued_diff, one, two);
1894 }
1895
1896 void diff_unmerge(struct diff_options *options,
1897 const char *path)
1898 {
1899 struct diff_filespec *one, *two;
1900 one = alloc_filespec(path);
1901 two = alloc_filespec(path);
1902 diff_queue(&diff_queued_diff, one, two);
1903 }
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