834b166064bc503c8c4a16222e9b05c3ada8f457
[git/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 "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 enum color_diff {
29 DIFF_RESET = 0,
30 DIFF_PLAIN = 1,
31 DIFF_METAINFO = 2,
32 DIFF_FRAGINFO = 3,
33 DIFF_FILE_OLD = 4,
34 DIFF_FILE_NEW = 5,
35 };
36
37 #define COLOR_NORMAL ""
38 #define COLOR_BOLD "\033[1m"
39 #define COLOR_DIM "\033[2m"
40 #define COLOR_UL "\033[4m"
41 #define COLOR_BLINK "\033[5m"
42 #define COLOR_REVERSE "\033[7m"
43 #define COLOR_RESET "\033[m"
44
45 #define COLOR_BLACK "\033[30m"
46 #define COLOR_RED "\033[31m"
47 #define COLOR_GREEN "\033[32m"
48 #define COLOR_YELLOW "\033[33m"
49 #define COLOR_BLUE "\033[34m"
50 #define COLOR_MAGENTA "\033[35m"
51 #define COLOR_CYAN "\033[36m"
52 #define COLOR_WHITE "\033[37m"
53
54 #define COLOR_CYANBG "\033[46m"
55 #define COLOR_GRAYBG "\033[47m" // Good for xterm
56
57 static const char *diff_colors[] = {
58 [DIFF_RESET] = COLOR_RESET,
59 [DIFF_PLAIN] = COLOR_NORMAL,
60 [DIFF_METAINFO] = COLOR_BOLD,
61 [DIFF_FRAGINFO] = COLOR_CYAN,
62 [DIFF_FILE_OLD] = COLOR_RED,
63 [DIFF_FILE_NEW] = COLOR_GREEN,
64 };
65
66 static char *quote_one(const char *str)
67 {
68 int needlen;
69 char *xp;
70
71 if (!str)
72 return NULL;
73 needlen = quote_c_style(str, NULL, NULL, 0);
74 if (!needlen)
75 return strdup(str);
76 xp = xmalloc(needlen + 1);
77 quote_c_style(str, xp, NULL, 0);
78 return xp;
79 }
80
81 static char *quote_two(const char *one, const char *two)
82 {
83 int need_one = quote_c_style(one, NULL, NULL, 1);
84 int need_two = quote_c_style(two, NULL, NULL, 1);
85 char *xp;
86
87 if (need_one + need_two) {
88 if (!need_one) need_one = strlen(one);
89 if (!need_two) need_one = strlen(two);
90
91 xp = xmalloc(need_one + need_two + 3);
92 xp[0] = '"';
93 quote_c_style(one, xp + 1, NULL, 1);
94 quote_c_style(two, xp + need_one + 1, NULL, 1);
95 strcpy(xp + need_one + need_two + 1, "\"");
96 return xp;
97 }
98 need_one = strlen(one);
99 need_two = strlen(two);
100 xp = xmalloc(need_one + need_two + 1);
101 strcpy(xp, one);
102 strcpy(xp + need_one, two);
103 return xp;
104 }
105
106 static const char *external_diff(void)
107 {
108 static const char *external_diff_cmd = NULL;
109 static int done_preparing = 0;
110
111 if (done_preparing)
112 return external_diff_cmd;
113 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
114 done_preparing = 1;
115 return external_diff_cmd;
116 }
117
118 #define TEMPFILE_PATH_LEN 50
119
120 static struct diff_tempfile {
121 const char *name; /* filename external diff should read from */
122 char hex[41];
123 char mode[10];
124 char tmp_path[TEMPFILE_PATH_LEN];
125 } diff_temp[2];
126
127 static int count_lines(const char *data, int size)
128 {
129 int count, ch, completely_empty = 1, nl_just_seen = 0;
130 count = 0;
131 while (0 < size--) {
132 ch = *data++;
133 if (ch == '\n') {
134 count++;
135 nl_just_seen = 1;
136 completely_empty = 0;
137 }
138 else {
139 nl_just_seen = 0;
140 completely_empty = 0;
141 }
142 }
143 if (completely_empty)
144 return 0;
145 if (!nl_just_seen)
146 count++; /* no trailing newline */
147 return count;
148 }
149
150 static void print_line_count(int count)
151 {
152 switch (count) {
153 case 0:
154 printf("0,0");
155 break;
156 case 1:
157 printf("1");
158 break;
159 default:
160 printf("1,%d", count);
161 break;
162 }
163 }
164
165 static void copy_file(int prefix, const char *data, int size)
166 {
167 int ch, nl_just_seen = 1;
168 while (0 < size--) {
169 ch = *data++;
170 if (nl_just_seen)
171 putchar(prefix);
172 putchar(ch);
173 if (ch == '\n')
174 nl_just_seen = 1;
175 else
176 nl_just_seen = 0;
177 }
178 if (!nl_just_seen)
179 printf("\n\\ No newline at end of file\n");
180 }
181
182 static void emit_rewrite_diff(const char *name_a,
183 const char *name_b,
184 struct diff_filespec *one,
185 struct diff_filespec *two)
186 {
187 int lc_a, lc_b;
188 diff_populate_filespec(one, 0);
189 diff_populate_filespec(two, 0);
190 lc_a = count_lines(one->data, one->size);
191 lc_b = count_lines(two->data, two->size);
192 printf("--- %s\n+++ %s\n@@ -", name_a, name_b);
193 print_line_count(lc_a);
194 printf(" +");
195 print_line_count(lc_b);
196 printf(" @@\n");
197 if (lc_a)
198 copy_file('-', one->data, one->size);
199 if (lc_b)
200 copy_file('+', two->data, two->size);
201 }
202
203 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
204 {
205 if (!DIFF_FILE_VALID(one)) {
206 mf->ptr = (char *)""; /* does not matter */
207 mf->size = 0;
208 return 0;
209 }
210 else if (diff_populate_filespec(one, 0))
211 return -1;
212 mf->ptr = one->data;
213 mf->size = one->size;
214 return 0;
215 }
216
217 struct emit_callback {
218 struct xdiff_emit_state xm;
219 int nparents, color_diff;
220 const char **label_path;
221 };
222
223 static inline const char *get_color(int diff_use_color, enum color_diff ix)
224 {
225 if (diff_use_color)
226 return diff_colors[ix];
227 return "";
228 }
229
230 static void fn_out_consume(void *priv, char *line, unsigned long len)
231 {
232 int i;
233 struct emit_callback *ecbdata = priv;
234 const char *set = get_color(ecbdata->color_diff, DIFF_METAINFO);
235 const char *reset = get_color(ecbdata->color_diff, DIFF_RESET);
236
237 if (ecbdata->label_path[0]) {
238 printf("%s--- %s%s\n", set, ecbdata->label_path[0], reset);
239 printf("%s+++ %s%s\n", set, ecbdata->label_path[1], reset);
240 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
241 }
242
243 /* This is not really necessary for now because
244 * this codepath only deals with two-way diffs.
245 */
246 for (i = 0; i < len && line[i] == '@'; i++)
247 ;
248 if (2 <= i && i < len && line[i] == ' ') {
249 ecbdata->nparents = i - 1;
250 set = get_color(ecbdata->color_diff, DIFF_FRAGINFO);
251 }
252 else if (len < ecbdata->nparents)
253 set = reset;
254 else {
255 int nparents = ecbdata->nparents;
256 int color = DIFF_PLAIN;
257 for (i = 0; i < nparents && len; i++) {
258 if (line[i] == '-')
259 color = DIFF_FILE_OLD;
260 else if (line[i] == '+')
261 color = DIFF_FILE_NEW;
262 }
263 set = get_color(ecbdata->color_diff, color);
264 }
265 if (len > 0 && line[len-1] == '\n')
266 len--;
267 printf("%s%.*s%s\n", set, (int) len, line, reset);
268 }
269
270 static char *pprint_rename(const char *a, const char *b)
271 {
272 const char *old = a;
273 const char *new = b;
274 char *name = NULL;
275 int pfx_length, sfx_length;
276 int len_a = strlen(a);
277 int len_b = strlen(b);
278
279 /* Find common prefix */
280 pfx_length = 0;
281 while (*old && *new && *old == *new) {
282 if (*old == '/')
283 pfx_length = old - a + 1;
284 old++;
285 new++;
286 }
287
288 /* Find common suffix */
289 old = a + len_a;
290 new = b + len_b;
291 sfx_length = 0;
292 while (a <= old && b <= new && *old == *new) {
293 if (*old == '/')
294 sfx_length = len_a - (old - a);
295 old--;
296 new--;
297 }
298
299 /*
300 * pfx{mid-a => mid-b}sfx
301 * {pfx-a => pfx-b}sfx
302 * pfx{sfx-a => sfx-b}
303 * name-a => name-b
304 */
305 if (pfx_length + sfx_length) {
306 int a_midlen = len_a - pfx_length - sfx_length;
307 int b_midlen = len_b - pfx_length - sfx_length;
308 if (a_midlen < 0) a_midlen = 0;
309 if (b_midlen < 0) b_midlen = 0;
310
311 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
312 sprintf(name, "%.*s{%.*s => %.*s}%s",
313 pfx_length, a,
314 a_midlen, a + pfx_length,
315 b_midlen, b + pfx_length,
316 a + len_a - sfx_length);
317 }
318 else {
319 name = xmalloc(len_a + len_b + 5);
320 sprintf(name, "%s => %s", a, b);
321 }
322 return name;
323 }
324
325 struct diffstat_t {
326 struct xdiff_emit_state xm;
327
328 int nr;
329 int alloc;
330 struct diffstat_file {
331 char *name;
332 unsigned is_unmerged:1;
333 unsigned is_binary:1;
334 unsigned is_renamed:1;
335 unsigned int added, deleted;
336 } **files;
337 };
338
339 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
340 const char *name_a,
341 const char *name_b)
342 {
343 struct diffstat_file *x;
344 x = xcalloc(sizeof (*x), 1);
345 if (diffstat->nr == diffstat->alloc) {
346 diffstat->alloc = alloc_nr(diffstat->alloc);
347 diffstat->files = xrealloc(diffstat->files,
348 diffstat->alloc * sizeof(x));
349 }
350 diffstat->files[diffstat->nr++] = x;
351 if (name_b) {
352 x->name = pprint_rename(name_a, name_b);
353 x->is_renamed = 1;
354 }
355 else
356 x->name = strdup(name_a);
357 return x;
358 }
359
360 static void diffstat_consume(void *priv, char *line, unsigned long len)
361 {
362 struct diffstat_t *diffstat = priv;
363 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
364
365 if (line[0] == '+')
366 x->added++;
367 else if (line[0] == '-')
368 x->deleted++;
369 }
370
371 static const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
372 static const char minuses[]= "----------------------------------------------------------------------";
373 const char mime_boundary_leader[] = "------------";
374
375 static void show_stats(struct diffstat_t* data)
376 {
377 int i, len, add, del, total, adds = 0, dels = 0;
378 int max, max_change = 0, max_len = 0;
379 int total_files = data->nr;
380
381 if (data->nr == 0)
382 return;
383
384 for (i = 0; i < data->nr; i++) {
385 struct diffstat_file *file = data->files[i];
386
387 len = strlen(file->name);
388 if (max_len < len)
389 max_len = len;
390
391 if (file->is_binary || file->is_unmerged)
392 continue;
393 if (max_change < file->added + file->deleted)
394 max_change = file->added + file->deleted;
395 }
396
397 for (i = 0; i < data->nr; i++) {
398 const char *prefix = "";
399 char *name = data->files[i]->name;
400 int added = data->files[i]->added;
401 int deleted = data->files[i]->deleted;
402
403 if (0 < (len = quote_c_style(name, NULL, NULL, 0))) {
404 char *qname = xmalloc(len + 1);
405 quote_c_style(name, qname, NULL, 0);
406 free(name);
407 data->files[i]->name = name = qname;
408 }
409
410 /*
411 * "scale" the filename
412 */
413 len = strlen(name);
414 max = max_len;
415 if (max > 50)
416 max = 50;
417 if (len > max) {
418 char *slash;
419 prefix = "...";
420 max -= 3;
421 name += len - max;
422 slash = strchr(name, '/');
423 if (slash)
424 name = slash;
425 }
426 len = max;
427
428 /*
429 * scale the add/delete
430 */
431 max = max_change;
432 if (max + len > 70)
433 max = 70 - len;
434
435 if (data->files[i]->is_binary) {
436 printf(" %s%-*s | Bin\n", prefix, len, name);
437 goto free_diffstat_file;
438 }
439 else if (data->files[i]->is_unmerged) {
440 printf(" %s%-*s | Unmerged\n", prefix, len, name);
441 goto free_diffstat_file;
442 }
443 else if (!data->files[i]->is_renamed &&
444 (added + deleted == 0)) {
445 total_files--;
446 goto free_diffstat_file;
447 }
448
449 add = added;
450 del = deleted;
451 total = add + del;
452 adds += add;
453 dels += del;
454
455 if (max_change > 0) {
456 total = (total * max + max_change / 2) / max_change;
457 add = (add * max + max_change / 2) / max_change;
458 del = total - add;
459 }
460 printf(" %s%-*s |%5d %.*s%.*s\n", prefix,
461 len, name, added + deleted,
462 add, pluses, del, minuses);
463 free_diffstat_file:
464 free(data->files[i]->name);
465 free(data->files[i]);
466 }
467 free(data->files);
468 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
469 total_files, adds, dels);
470 }
471
472 struct checkdiff_t {
473 struct xdiff_emit_state xm;
474 const char *filename;
475 int lineno;
476 };
477
478 static void checkdiff_consume(void *priv, char *line, unsigned long len)
479 {
480 struct checkdiff_t *data = priv;
481
482 if (line[0] == '+') {
483 int i, spaces = 0;
484
485 data->lineno++;
486
487 /* check space before tab */
488 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
489 if (line[i] == ' ')
490 spaces++;
491 if (line[i - 1] == '\t' && spaces)
492 printf("%s:%d: space before tab:%.*s\n",
493 data->filename, data->lineno, (int)len, line);
494
495 /* check white space at line end */
496 if (line[len - 1] == '\n')
497 len--;
498 if (isspace(line[len - 1]))
499 printf("%s:%d: white space at end: %.*s\n",
500 data->filename, data->lineno, (int)len, line);
501 } else if (line[0] == ' ')
502 data->lineno++;
503 else if (line[0] == '@') {
504 char *plus = strchr(line, '+');
505 if (plus)
506 data->lineno = strtol(plus, NULL, 10);
507 else
508 die("invalid diff");
509 }
510 }
511
512 static unsigned char *deflate_it(char *data,
513 unsigned long size,
514 unsigned long *result_size)
515 {
516 int bound;
517 unsigned char *deflated;
518 z_stream stream;
519
520 memset(&stream, 0, sizeof(stream));
521 deflateInit(&stream, Z_BEST_COMPRESSION);
522 bound = deflateBound(&stream, size);
523 deflated = xmalloc(bound);
524 stream.next_out = deflated;
525 stream.avail_out = bound;
526
527 stream.next_in = (unsigned char *)data;
528 stream.avail_in = size;
529 while (deflate(&stream, Z_FINISH) == Z_OK)
530 ; /* nothing */
531 deflateEnd(&stream);
532 *result_size = stream.total_out;
533 return deflated;
534 }
535
536 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
537 {
538 void *cp;
539 void *delta;
540 void *deflated;
541 void *data;
542 unsigned long orig_size;
543 unsigned long delta_size;
544 unsigned long deflate_size;
545 unsigned long data_size;
546
547 printf("GIT binary patch\n");
548 /* We could do deflated delta, or we could do just deflated two,
549 * whichever is smaller.
550 */
551 delta = NULL;
552 deflated = deflate_it(two->ptr, two->size, &deflate_size);
553 if (one->size && two->size) {
554 delta = diff_delta(one->ptr, one->size,
555 two->ptr, two->size,
556 &delta_size, deflate_size);
557 if (delta) {
558 void *to_free = delta;
559 orig_size = delta_size;
560 delta = deflate_it(delta, delta_size, &delta_size);
561 free(to_free);
562 }
563 }
564
565 if (delta && delta_size < deflate_size) {
566 printf("delta %lu\n", orig_size);
567 free(deflated);
568 data = delta;
569 data_size = delta_size;
570 }
571 else {
572 printf("literal %lu\n", two->size);
573 free(delta);
574 data = deflated;
575 data_size = deflate_size;
576 }
577
578 /* emit data encoded in base85 */
579 cp = data;
580 while (data_size) {
581 int bytes = (52 < data_size) ? 52 : data_size;
582 char line[70];
583 data_size -= bytes;
584 if (bytes <= 26)
585 line[0] = bytes + 'A' - 1;
586 else
587 line[0] = bytes - 26 + 'a' - 1;
588 encode_85(line + 1, cp, bytes);
589 cp = (char *) cp + bytes;
590 puts(line);
591 }
592 printf("\n");
593 free(data);
594 }
595
596 #define FIRST_FEW_BYTES 8000
597 static int mmfile_is_binary(mmfile_t *mf)
598 {
599 long sz = mf->size;
600 if (FIRST_FEW_BYTES < sz)
601 sz = FIRST_FEW_BYTES;
602 if (memchr(mf->ptr, 0, sz))
603 return 1;
604 return 0;
605 }
606
607 static void builtin_diff(const char *name_a,
608 const char *name_b,
609 struct diff_filespec *one,
610 struct diff_filespec *two,
611 const char *xfrm_msg,
612 struct diff_options *o,
613 int complete_rewrite)
614 {
615 mmfile_t mf1, mf2;
616 const char *lbl[2];
617 char *a_one, *b_two;
618 const char *set = get_color(o->color_diff, DIFF_METAINFO);
619 const char *reset = get_color(o->color_diff, DIFF_RESET);
620
621 a_one = quote_two("a/", name_a);
622 b_two = quote_two("b/", name_b);
623 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
624 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
625 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
626 if (lbl[0][0] == '/') {
627 /* /dev/null */
628 printf("%snew file mode %06o%s\n", set, two->mode, reset);
629 if (xfrm_msg && xfrm_msg[0])
630 printf("%s%s%s\n", set, xfrm_msg, reset);
631 }
632 else if (lbl[1][0] == '/') {
633 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
634 if (xfrm_msg && xfrm_msg[0])
635 printf("%s%s%s\n", set, xfrm_msg, reset);
636 }
637 else {
638 if (one->mode != two->mode) {
639 printf("%sold mode %06o%s\n", set, one->mode, reset);
640 printf("%snew mode %06o%s\n", set, two->mode, reset);
641 }
642 if (xfrm_msg && xfrm_msg[0])
643 printf("%s%s%s\n", set, xfrm_msg, reset);
644 /*
645 * we do not run diff between different kind
646 * of objects.
647 */
648 if ((one->mode ^ two->mode) & S_IFMT)
649 goto free_ab_and_return;
650 if (complete_rewrite) {
651 emit_rewrite_diff(name_a, name_b, one, two);
652 goto free_ab_and_return;
653 }
654 }
655
656 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
657 die("unable to read files to diff");
658
659 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2)) {
660 /* Quite common confusing case */
661 if (mf1.size == mf2.size &&
662 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
663 goto free_ab_and_return;
664 if (o->binary)
665 emit_binary_diff(&mf1, &mf2);
666 else
667 printf("Binary files %s and %s differ\n",
668 lbl[0], lbl[1]);
669 }
670 else {
671 /* Crazy xdl interfaces.. */
672 const char *diffopts = getenv("GIT_DIFF_OPTS");
673 xpparam_t xpp;
674 xdemitconf_t xecfg;
675 xdemitcb_t ecb;
676 struct emit_callback ecbdata;
677
678 memset(&ecbdata, 0, sizeof(ecbdata));
679 ecbdata.label_path = lbl;
680 ecbdata.color_diff = o->color_diff;
681 xpp.flags = XDF_NEED_MINIMAL;
682 xecfg.ctxlen = o->context;
683 xecfg.flags = XDL_EMIT_FUNCNAMES;
684 if (!diffopts)
685 ;
686 else if (!strncmp(diffopts, "--unified=", 10))
687 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
688 else if (!strncmp(diffopts, "-u", 2))
689 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
690 ecb.outf = xdiff_outf;
691 ecb.priv = &ecbdata;
692 ecbdata.xm.consume = fn_out_consume;
693 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
694 }
695
696 free_ab_and_return:
697 free(a_one);
698 free(b_two);
699 return;
700 }
701
702 static void builtin_diffstat(const char *name_a, const char *name_b,
703 struct diff_filespec *one,
704 struct diff_filespec *two,
705 struct diffstat_t *diffstat,
706 int complete_rewrite)
707 {
708 mmfile_t mf1, mf2;
709 struct diffstat_file *data;
710
711 data = diffstat_add(diffstat, name_a, name_b);
712
713 if (!one || !two) {
714 data->is_unmerged = 1;
715 return;
716 }
717 if (complete_rewrite) {
718 diff_populate_filespec(one, 0);
719 diff_populate_filespec(two, 0);
720 data->deleted = count_lines(one->data, one->size);
721 data->added = count_lines(two->data, two->size);
722 return;
723 }
724 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
725 die("unable to read files to diff");
726
727 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
728 data->is_binary = 1;
729 else {
730 /* Crazy xdl interfaces.. */
731 xpparam_t xpp;
732 xdemitconf_t xecfg;
733 xdemitcb_t ecb;
734
735 xpp.flags = XDF_NEED_MINIMAL;
736 xecfg.ctxlen = 0;
737 xecfg.flags = 0;
738 ecb.outf = xdiff_outf;
739 ecb.priv = diffstat;
740 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
741 }
742 }
743
744 static void builtin_checkdiff(const char *name_a, const char *name_b,
745 struct diff_filespec *one,
746 struct diff_filespec *two)
747 {
748 mmfile_t mf1, mf2;
749 struct checkdiff_t data;
750
751 if (!two)
752 return;
753
754 memset(&data, 0, sizeof(data));
755 data.xm.consume = checkdiff_consume;
756 data.filename = name_b ? name_b : name_a;
757 data.lineno = 0;
758
759 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
760 die("unable to read files to diff");
761
762 if (mmfile_is_binary(&mf2))
763 return;
764 else {
765 /* Crazy xdl interfaces.. */
766 xpparam_t xpp;
767 xdemitconf_t xecfg;
768 xdemitcb_t ecb;
769
770 xpp.flags = XDF_NEED_MINIMAL;
771 xecfg.ctxlen = 0;
772 xecfg.flags = 0;
773 ecb.outf = xdiff_outf;
774 ecb.priv = &data;
775 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
776 }
777 }
778
779 struct diff_filespec *alloc_filespec(const char *path)
780 {
781 int namelen = strlen(path);
782 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
783
784 memset(spec, 0, sizeof(*spec));
785 spec->path = (char *)(spec + 1);
786 memcpy(spec->path, path, namelen+1);
787 return spec;
788 }
789
790 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
791 unsigned short mode)
792 {
793 if (mode) {
794 spec->mode = canon_mode(mode);
795 memcpy(spec->sha1, sha1, 20);
796 spec->sha1_valid = !!memcmp(sha1, null_sha1, 20);
797 }
798 }
799
800 /*
801 * Given a name and sha1 pair, if the dircache tells us the file in
802 * the work tree has that object contents, return true, so that
803 * prepare_temp_file() does not have to inflate and extract.
804 */
805 static int work_tree_matches(const char *name, const unsigned char *sha1)
806 {
807 struct cache_entry *ce;
808 struct stat st;
809 int pos, len;
810
811 /* We do not read the cache ourselves here, because the
812 * benchmark with my previous version that always reads cache
813 * shows that it makes things worse for diff-tree comparing
814 * two linux-2.6 kernel trees in an already checked out work
815 * tree. This is because most diff-tree comparisons deal with
816 * only a small number of files, while reading the cache is
817 * expensive for a large project, and its cost outweighs the
818 * savings we get by not inflating the object to a temporary
819 * file. Practically, this code only helps when we are used
820 * by diff-cache --cached, which does read the cache before
821 * calling us.
822 */
823 if (!active_cache)
824 return 0;
825
826 len = strlen(name);
827 pos = cache_name_pos(name, len);
828 if (pos < 0)
829 return 0;
830 ce = active_cache[pos];
831 if ((lstat(name, &st) < 0) ||
832 !S_ISREG(st.st_mode) || /* careful! */
833 ce_match_stat(ce, &st, 0) ||
834 memcmp(sha1, ce->sha1, 20))
835 return 0;
836 /* we return 1 only when we can stat, it is a regular file,
837 * stat information matches, and sha1 recorded in the cache
838 * matches. I.e. we know the file in the work tree really is
839 * the same as the <name, sha1> pair.
840 */
841 return 1;
842 }
843
844 static struct sha1_size_cache {
845 unsigned char sha1[20];
846 unsigned long size;
847 } **sha1_size_cache;
848 static int sha1_size_cache_nr, sha1_size_cache_alloc;
849
850 static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
851 int find_only,
852 unsigned long size)
853 {
854 int first, last;
855 struct sha1_size_cache *e;
856
857 first = 0;
858 last = sha1_size_cache_nr;
859 while (last > first) {
860 int cmp, next = (last + first) >> 1;
861 e = sha1_size_cache[next];
862 cmp = memcmp(e->sha1, sha1, 20);
863 if (!cmp)
864 return e;
865 if (cmp < 0) {
866 last = next;
867 continue;
868 }
869 first = next+1;
870 }
871 /* not found */
872 if (find_only)
873 return NULL;
874 /* insert to make it at "first" */
875 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
876 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
877 sha1_size_cache = xrealloc(sha1_size_cache,
878 sha1_size_cache_alloc *
879 sizeof(*sha1_size_cache));
880 }
881 sha1_size_cache_nr++;
882 if (first < sha1_size_cache_nr)
883 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
884 (sha1_size_cache_nr - first - 1) *
885 sizeof(*sha1_size_cache));
886 e = xmalloc(sizeof(struct sha1_size_cache));
887 sha1_size_cache[first] = e;
888 memcpy(e->sha1, sha1, 20);
889 e->size = size;
890 return e;
891 }
892
893 /*
894 * While doing rename detection and pickaxe operation, we may need to
895 * grab the data for the blob (or file) for our own in-core comparison.
896 * diff_filespec has data and size fields for this purpose.
897 */
898 int diff_populate_filespec(struct diff_filespec *s, int size_only)
899 {
900 int err = 0;
901 if (!DIFF_FILE_VALID(s))
902 die("internal error: asking to populate invalid file.");
903 if (S_ISDIR(s->mode))
904 return -1;
905
906 if (!use_size_cache)
907 size_only = 0;
908
909 if (s->data)
910 return err;
911 if (!s->sha1_valid ||
912 work_tree_matches(s->path, s->sha1)) {
913 struct stat st;
914 int fd;
915 if (lstat(s->path, &st) < 0) {
916 if (errno == ENOENT) {
917 err_empty:
918 err = -1;
919 empty:
920 s->data = (char *)"";
921 s->size = 0;
922 return err;
923 }
924 }
925 s->size = st.st_size;
926 if (!s->size)
927 goto empty;
928 if (size_only)
929 return 0;
930 if (S_ISLNK(st.st_mode)) {
931 int ret;
932 s->data = xmalloc(s->size);
933 s->should_free = 1;
934 ret = readlink(s->path, s->data, s->size);
935 if (ret < 0) {
936 free(s->data);
937 goto err_empty;
938 }
939 return 0;
940 }
941 fd = open(s->path, O_RDONLY);
942 if (fd < 0)
943 goto err_empty;
944 s->data = mmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
945 close(fd);
946 if (s->data == MAP_FAILED)
947 goto err_empty;
948 s->should_munmap = 1;
949 }
950 else {
951 char type[20];
952 struct sha1_size_cache *e;
953
954 if (size_only) {
955 e = locate_size_cache(s->sha1, 1, 0);
956 if (e) {
957 s->size = e->size;
958 return 0;
959 }
960 if (!sha1_object_info(s->sha1, type, &s->size))
961 locate_size_cache(s->sha1, 0, s->size);
962 }
963 else {
964 s->data = read_sha1_file(s->sha1, type, &s->size);
965 s->should_free = 1;
966 }
967 }
968 return 0;
969 }
970
971 void diff_free_filespec_data(struct diff_filespec *s)
972 {
973 if (s->should_free)
974 free(s->data);
975 else if (s->should_munmap)
976 munmap(s->data, s->size);
977 s->should_free = s->should_munmap = 0;
978 s->data = NULL;
979 free(s->cnt_data);
980 s->cnt_data = NULL;
981 }
982
983 static void prep_temp_blob(struct diff_tempfile *temp,
984 void *blob,
985 unsigned long size,
986 const unsigned char *sha1,
987 int mode)
988 {
989 int fd;
990
991 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
992 if (fd < 0)
993 die("unable to create temp-file");
994 if (write(fd, blob, size) != size)
995 die("unable to write temp-file");
996 close(fd);
997 temp->name = temp->tmp_path;
998 strcpy(temp->hex, sha1_to_hex(sha1));
999 temp->hex[40] = 0;
1000 sprintf(temp->mode, "%06o", mode);
1001 }
1002
1003 static void prepare_temp_file(const char *name,
1004 struct diff_tempfile *temp,
1005 struct diff_filespec *one)
1006 {
1007 if (!DIFF_FILE_VALID(one)) {
1008 not_a_valid_file:
1009 /* A '-' entry produces this for file-2, and
1010 * a '+' entry produces this for file-1.
1011 */
1012 temp->name = "/dev/null";
1013 strcpy(temp->hex, ".");
1014 strcpy(temp->mode, ".");
1015 return;
1016 }
1017
1018 if (!one->sha1_valid ||
1019 work_tree_matches(name, one->sha1)) {
1020 struct stat st;
1021 if (lstat(name, &st) < 0) {
1022 if (errno == ENOENT)
1023 goto not_a_valid_file;
1024 die("stat(%s): %s", name, strerror(errno));
1025 }
1026 if (S_ISLNK(st.st_mode)) {
1027 int ret;
1028 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1029 if (sizeof(buf) <= st.st_size)
1030 die("symlink too long: %s", name);
1031 ret = readlink(name, buf, st.st_size);
1032 if (ret < 0)
1033 die("readlink(%s)", name);
1034 prep_temp_blob(temp, buf, st.st_size,
1035 (one->sha1_valid ?
1036 one->sha1 : null_sha1),
1037 (one->sha1_valid ?
1038 one->mode : S_IFLNK));
1039 }
1040 else {
1041 /* we can borrow from the file in the work tree */
1042 temp->name = name;
1043 if (!one->sha1_valid)
1044 strcpy(temp->hex, sha1_to_hex(null_sha1));
1045 else
1046 strcpy(temp->hex, sha1_to_hex(one->sha1));
1047 /* Even though we may sometimes borrow the
1048 * contents from the work tree, we always want
1049 * one->mode. mode is trustworthy even when
1050 * !(one->sha1_valid), as long as
1051 * DIFF_FILE_VALID(one).
1052 */
1053 sprintf(temp->mode, "%06o", one->mode);
1054 }
1055 return;
1056 }
1057 else {
1058 if (diff_populate_filespec(one, 0))
1059 die("cannot read data blob for %s", one->path);
1060 prep_temp_blob(temp, one->data, one->size,
1061 one->sha1, one->mode);
1062 }
1063 }
1064
1065 static void remove_tempfile(void)
1066 {
1067 int i;
1068
1069 for (i = 0; i < 2; i++)
1070 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1071 unlink(diff_temp[i].name);
1072 diff_temp[i].name = NULL;
1073 }
1074 }
1075
1076 static void remove_tempfile_on_signal(int signo)
1077 {
1078 remove_tempfile();
1079 signal(SIGINT, SIG_DFL);
1080 raise(signo);
1081 }
1082
1083 static int spawn_prog(const char *pgm, const char **arg)
1084 {
1085 pid_t pid;
1086 int status;
1087
1088 fflush(NULL);
1089 pid = fork();
1090 if (pid < 0)
1091 die("unable to fork");
1092 if (!pid) {
1093 execvp(pgm, (char *const*) arg);
1094 exit(255);
1095 }
1096
1097 while (waitpid(pid, &status, 0) < 0) {
1098 if (errno == EINTR)
1099 continue;
1100 return -1;
1101 }
1102
1103 /* Earlier we did not check the exit status because
1104 * diff exits non-zero if files are different, and
1105 * we are not interested in knowing that. It was a
1106 * mistake which made it harder to quit a diff-*
1107 * session that uses the git-apply-patch-script as
1108 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1109 * should also exit non-zero only when it wants to
1110 * abort the entire diff-* session.
1111 */
1112 if (WIFEXITED(status) && !WEXITSTATUS(status))
1113 return 0;
1114 return -1;
1115 }
1116
1117 /* An external diff command takes:
1118 *
1119 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1120 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1121 *
1122 */
1123 static void run_external_diff(const char *pgm,
1124 const char *name,
1125 const char *other,
1126 struct diff_filespec *one,
1127 struct diff_filespec *two,
1128 const char *xfrm_msg,
1129 int complete_rewrite)
1130 {
1131 const char *spawn_arg[10];
1132 struct diff_tempfile *temp = diff_temp;
1133 int retval;
1134 static int atexit_asked = 0;
1135 const char *othername;
1136 const char **arg = &spawn_arg[0];
1137
1138 othername = (other? other : name);
1139 if (one && two) {
1140 prepare_temp_file(name, &temp[0], one);
1141 prepare_temp_file(othername, &temp[1], two);
1142 if (! atexit_asked &&
1143 (temp[0].name == temp[0].tmp_path ||
1144 temp[1].name == temp[1].tmp_path)) {
1145 atexit_asked = 1;
1146 atexit(remove_tempfile);
1147 }
1148 signal(SIGINT, remove_tempfile_on_signal);
1149 }
1150
1151 if (one && two) {
1152 *arg++ = pgm;
1153 *arg++ = name;
1154 *arg++ = temp[0].name;
1155 *arg++ = temp[0].hex;
1156 *arg++ = temp[0].mode;
1157 *arg++ = temp[1].name;
1158 *arg++ = temp[1].hex;
1159 *arg++ = temp[1].mode;
1160 if (other) {
1161 *arg++ = other;
1162 *arg++ = xfrm_msg;
1163 }
1164 } else {
1165 *arg++ = pgm;
1166 *arg++ = name;
1167 }
1168 *arg = NULL;
1169 retval = spawn_prog(pgm, spawn_arg);
1170 remove_tempfile();
1171 if (retval) {
1172 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1173 exit(1);
1174 }
1175 }
1176
1177 static void run_diff_cmd(const char *pgm,
1178 const char *name,
1179 const char *other,
1180 struct diff_filespec *one,
1181 struct diff_filespec *two,
1182 const char *xfrm_msg,
1183 struct diff_options *o,
1184 int complete_rewrite)
1185 {
1186 if (pgm) {
1187 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1188 complete_rewrite);
1189 return;
1190 }
1191 if (one && two)
1192 builtin_diff(name, other ? other : name,
1193 one, two, xfrm_msg, o, complete_rewrite);
1194 else
1195 printf("* Unmerged path %s\n", name);
1196 }
1197
1198 static void diff_fill_sha1_info(struct diff_filespec *one)
1199 {
1200 if (DIFF_FILE_VALID(one)) {
1201 if (!one->sha1_valid) {
1202 struct stat st;
1203 if (lstat(one->path, &st) < 0)
1204 die("stat %s", one->path);
1205 if (index_path(one->sha1, one->path, &st, 0))
1206 die("cannot hash %s\n", one->path);
1207 }
1208 }
1209 else
1210 memset(one->sha1, 0, 20);
1211 }
1212
1213 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1214 {
1215 const char *pgm = external_diff();
1216 char msg[PATH_MAX*2+300], *xfrm_msg;
1217 struct diff_filespec *one;
1218 struct diff_filespec *two;
1219 const char *name;
1220 const char *other;
1221 char *name_munged, *other_munged;
1222 int complete_rewrite = 0;
1223 int len;
1224
1225 if (DIFF_PAIR_UNMERGED(p)) {
1226 /* unmerged */
1227 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1228 return;
1229 }
1230
1231 name = p->one->path;
1232 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1233 name_munged = quote_one(name);
1234 other_munged = quote_one(other);
1235 one = p->one; two = p->two;
1236
1237 diff_fill_sha1_info(one);
1238 diff_fill_sha1_info(two);
1239
1240 len = 0;
1241 switch (p->status) {
1242 case DIFF_STATUS_COPIED:
1243 len += snprintf(msg + len, sizeof(msg) - len,
1244 "similarity index %d%%\n"
1245 "copy from %s\n"
1246 "copy to %s\n",
1247 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1248 name_munged, other_munged);
1249 break;
1250 case DIFF_STATUS_RENAMED:
1251 len += snprintf(msg + len, sizeof(msg) - len,
1252 "similarity index %d%%\n"
1253 "rename from %s\n"
1254 "rename to %s\n",
1255 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1256 name_munged, other_munged);
1257 break;
1258 case DIFF_STATUS_MODIFIED:
1259 if (p->score) {
1260 len += snprintf(msg + len, sizeof(msg) - len,
1261 "dissimilarity index %d%%\n",
1262 (int)(0.5 + p->score *
1263 100.0/MAX_SCORE));
1264 complete_rewrite = 1;
1265 break;
1266 }
1267 /* fallthru */
1268 default:
1269 /* nothing */
1270 ;
1271 }
1272
1273 if (memcmp(one->sha1, two->sha1, 20)) {
1274 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1275
1276 len += snprintf(msg + len, sizeof(msg) - len,
1277 "index %.*s..%.*s",
1278 abbrev, sha1_to_hex(one->sha1),
1279 abbrev, sha1_to_hex(two->sha1));
1280 if (one->mode == two->mode)
1281 len += snprintf(msg + len, sizeof(msg) - len,
1282 " %06o", one->mode);
1283 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1284 }
1285
1286 if (len)
1287 msg[--len] = 0;
1288 xfrm_msg = len ? msg : NULL;
1289
1290 if (!pgm &&
1291 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1292 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1293 /* a filepair that changes between file and symlink
1294 * needs to be split into deletion and creation.
1295 */
1296 struct diff_filespec *null = alloc_filespec(two->path);
1297 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1298 free(null);
1299 null = alloc_filespec(one->path);
1300 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1301 free(null);
1302 }
1303 else
1304 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1305 complete_rewrite);
1306
1307 free(name_munged);
1308 free(other_munged);
1309 }
1310
1311 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1312 struct diffstat_t *diffstat)
1313 {
1314 const char *name;
1315 const char *other;
1316 int complete_rewrite = 0;
1317
1318 if (DIFF_PAIR_UNMERGED(p)) {
1319 /* unmerged */
1320 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, 0);
1321 return;
1322 }
1323
1324 name = p->one->path;
1325 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1326
1327 diff_fill_sha1_info(p->one);
1328 diff_fill_sha1_info(p->two);
1329
1330 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1331 complete_rewrite = 1;
1332 builtin_diffstat(name, other, p->one, p->two, diffstat, complete_rewrite);
1333 }
1334
1335 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1336 {
1337 const char *name;
1338 const char *other;
1339
1340 if (DIFF_PAIR_UNMERGED(p)) {
1341 /* unmerged */
1342 return;
1343 }
1344
1345 name = p->one->path;
1346 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1347
1348 diff_fill_sha1_info(p->one);
1349 diff_fill_sha1_info(p->two);
1350
1351 builtin_checkdiff(name, other, p->one, p->two);
1352 }
1353
1354 void diff_setup(struct diff_options *options)
1355 {
1356 memset(options, 0, sizeof(*options));
1357 options->output_format = DIFF_FORMAT_RAW;
1358 options->line_termination = '\n';
1359 options->break_opt = -1;
1360 options->rename_limit = -1;
1361 options->context = 3;
1362
1363 options->change = diff_change;
1364 options->add_remove = diff_addremove;
1365 }
1366
1367 int diff_setup_done(struct diff_options *options)
1368 {
1369 if ((options->find_copies_harder &&
1370 options->detect_rename != DIFF_DETECT_COPY) ||
1371 (0 <= options->rename_limit && !options->detect_rename))
1372 return -1;
1373
1374 /*
1375 * These cases always need recursive; we do not drop caller-supplied
1376 * recursive bits for other formats here.
1377 */
1378 if ((options->output_format == DIFF_FORMAT_PATCH) ||
1379 (options->output_format == DIFF_FORMAT_DIFFSTAT) ||
1380 (options->output_format == DIFF_FORMAT_CHECKDIFF))
1381 options->recursive = 1;
1382
1383 /*
1384 * These combinations do not make sense.
1385 */
1386 if (options->output_format == DIFF_FORMAT_RAW)
1387 options->with_raw = 0;
1388 if (options->output_format == DIFF_FORMAT_DIFFSTAT)
1389 options->with_stat = 0;
1390
1391 if (options->detect_rename && options->rename_limit < 0)
1392 options->rename_limit = diff_rename_limit_default;
1393 if (options->setup & DIFF_SETUP_USE_CACHE) {
1394 if (!active_cache)
1395 /* read-cache does not die even when it fails
1396 * so it is safe for us to do this here. Also
1397 * it does not smudge active_cache or active_nr
1398 * when it fails, so we do not have to worry about
1399 * cleaning it up ourselves either.
1400 */
1401 read_cache();
1402 }
1403 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
1404 use_size_cache = 1;
1405 if (options->abbrev <= 0 || 40 < options->abbrev)
1406 options->abbrev = 40; /* full */
1407
1408 return 0;
1409 }
1410
1411 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
1412 {
1413 char c, *eq;
1414 int len;
1415
1416 if (*arg != '-')
1417 return 0;
1418 c = *++arg;
1419 if (!c)
1420 return 0;
1421 if (c == arg_short) {
1422 c = *++arg;
1423 if (!c)
1424 return 1;
1425 if (val && isdigit(c)) {
1426 char *end;
1427 int n = strtoul(arg, &end, 10);
1428 if (*end)
1429 return 0;
1430 *val = n;
1431 return 1;
1432 }
1433 return 0;
1434 }
1435 if (c != '-')
1436 return 0;
1437 arg++;
1438 eq = strchr(arg, '=');
1439 if (eq)
1440 len = eq - arg;
1441 else
1442 len = strlen(arg);
1443 if (!len || strncmp(arg, arg_long, len))
1444 return 0;
1445 if (eq) {
1446 int n;
1447 char *end;
1448 if (!isdigit(*++eq))
1449 return 0;
1450 n = strtoul(eq, &end, 10);
1451 if (*end)
1452 return 0;
1453 *val = n;
1454 }
1455 return 1;
1456 }
1457
1458 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
1459 {
1460 const char *arg = av[0];
1461 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
1462 options->output_format = DIFF_FORMAT_PATCH;
1463 else if (opt_arg(arg, 'U', "unified", &options->context))
1464 options->output_format = DIFF_FORMAT_PATCH;
1465 else if (!strcmp(arg, "--patch-with-raw")) {
1466 options->output_format = DIFF_FORMAT_PATCH;
1467 options->with_raw = 1;
1468 }
1469 else if (!strcmp(arg, "--stat"))
1470 options->output_format = DIFF_FORMAT_DIFFSTAT;
1471 else if (!strcmp(arg, "--check"))
1472 options->output_format = DIFF_FORMAT_CHECKDIFF;
1473 else if (!strcmp(arg, "--summary"))
1474 options->summary = 1;
1475 else if (!strcmp(arg, "--patch-with-stat")) {
1476 options->output_format = DIFF_FORMAT_PATCH;
1477 options->with_stat = 1;
1478 }
1479 else if (!strcmp(arg, "-z"))
1480 options->line_termination = 0;
1481 else if (!strncmp(arg, "-l", 2))
1482 options->rename_limit = strtoul(arg+2, NULL, 10);
1483 else if (!strcmp(arg, "--full-index"))
1484 options->full_index = 1;
1485 else if (!strcmp(arg, "--binary")) {
1486 options->output_format = DIFF_FORMAT_PATCH;
1487 options->full_index = options->binary = 1;
1488 }
1489 else if (!strcmp(arg, "--name-only"))
1490 options->output_format = DIFF_FORMAT_NAME;
1491 else if (!strcmp(arg, "--name-status"))
1492 options->output_format = DIFF_FORMAT_NAME_STATUS;
1493 else if (!strcmp(arg, "-R"))
1494 options->reverse_diff = 1;
1495 else if (!strncmp(arg, "-S", 2))
1496 options->pickaxe = arg + 2;
1497 else if (!strcmp(arg, "-s"))
1498 options->output_format = DIFF_FORMAT_NO_OUTPUT;
1499 else if (!strncmp(arg, "-O", 2))
1500 options->orderfile = arg + 2;
1501 else if (!strncmp(arg, "--diff-filter=", 14))
1502 options->filter = arg + 14;
1503 else if (!strcmp(arg, "--pickaxe-all"))
1504 options->pickaxe_opts = DIFF_PICKAXE_ALL;
1505 else if (!strcmp(arg, "--pickaxe-regex"))
1506 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
1507 else if (!strncmp(arg, "-B", 2)) {
1508 if ((options->break_opt =
1509 diff_scoreopt_parse(arg)) == -1)
1510 return -1;
1511 }
1512 else if (!strncmp(arg, "-M", 2)) {
1513 if ((options->rename_score =
1514 diff_scoreopt_parse(arg)) == -1)
1515 return -1;
1516 options->detect_rename = DIFF_DETECT_RENAME;
1517 }
1518 else if (!strncmp(arg, "-C", 2)) {
1519 if ((options->rename_score =
1520 diff_scoreopt_parse(arg)) == -1)
1521 return -1;
1522 options->detect_rename = DIFF_DETECT_COPY;
1523 }
1524 else if (!strcmp(arg, "--find-copies-harder"))
1525 options->find_copies_harder = 1;
1526 else if (!strcmp(arg, "--abbrev"))
1527 options->abbrev = DEFAULT_ABBREV;
1528 else if (!strncmp(arg, "--abbrev=", 9)) {
1529 options->abbrev = strtoul(arg + 9, NULL, 10);
1530 if (options->abbrev < MINIMUM_ABBREV)
1531 options->abbrev = MINIMUM_ABBREV;
1532 else if (40 < options->abbrev)
1533 options->abbrev = 40;
1534 }
1535 else if (!strcmp(arg, "--color"))
1536 options->color_diff = 1;
1537 else
1538 return 0;
1539 return 1;
1540 }
1541
1542 static int parse_num(const char **cp_p)
1543 {
1544 unsigned long num, scale;
1545 int ch, dot;
1546 const char *cp = *cp_p;
1547
1548 num = 0;
1549 scale = 1;
1550 dot = 0;
1551 for(;;) {
1552 ch = *cp;
1553 if ( !dot && ch == '.' ) {
1554 scale = 1;
1555 dot = 1;
1556 } else if ( ch == '%' ) {
1557 scale = dot ? scale*100 : 100;
1558 cp++; /* % is always at the end */
1559 break;
1560 } else if ( ch >= '0' && ch <= '9' ) {
1561 if ( scale < 100000 ) {
1562 scale *= 10;
1563 num = (num*10) + (ch-'0');
1564 }
1565 } else {
1566 break;
1567 }
1568 cp++;
1569 }
1570 *cp_p = cp;
1571
1572 /* user says num divided by scale and we say internally that
1573 * is MAX_SCORE * num / scale.
1574 */
1575 return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
1576 }
1577
1578 int diff_scoreopt_parse(const char *opt)
1579 {
1580 int opt1, opt2, cmd;
1581
1582 if (*opt++ != '-')
1583 return -1;
1584 cmd = *opt++;
1585 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
1586 return -1; /* that is not a -M, -C nor -B option */
1587
1588 opt1 = parse_num(&opt);
1589 if (cmd != 'B')
1590 opt2 = 0;
1591 else {
1592 if (*opt == 0)
1593 opt2 = 0;
1594 else if (*opt != '/')
1595 return -1; /* we expect -B80/99 or -B80 */
1596 else {
1597 opt++;
1598 opt2 = parse_num(&opt);
1599 }
1600 }
1601 if (*opt != 0)
1602 return -1;
1603 return opt1 | (opt2 << 16);
1604 }
1605
1606 struct diff_queue_struct diff_queued_diff;
1607
1608 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
1609 {
1610 if (queue->alloc <= queue->nr) {
1611 queue->alloc = alloc_nr(queue->alloc);
1612 queue->queue = xrealloc(queue->queue,
1613 sizeof(dp) * queue->alloc);
1614 }
1615 queue->queue[queue->nr++] = dp;
1616 }
1617
1618 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
1619 struct diff_filespec *one,
1620 struct diff_filespec *two)
1621 {
1622 struct diff_filepair *dp = xmalloc(sizeof(*dp));
1623 dp->one = one;
1624 dp->two = two;
1625 dp->score = 0;
1626 dp->status = 0;
1627 dp->source_stays = 0;
1628 dp->broken_pair = 0;
1629 if (queue)
1630 diff_q(queue, dp);
1631 return dp;
1632 }
1633
1634 void diff_free_filepair(struct diff_filepair *p)
1635 {
1636 diff_free_filespec_data(p->one);
1637 diff_free_filespec_data(p->two);
1638 free(p->one);
1639 free(p->two);
1640 free(p);
1641 }
1642
1643 /* This is different from find_unique_abbrev() in that
1644 * it stuffs the result with dots for alignment.
1645 */
1646 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
1647 {
1648 int abblen;
1649 const char *abbrev;
1650 if (len == 40)
1651 return sha1_to_hex(sha1);
1652
1653 abbrev = find_unique_abbrev(sha1, len);
1654 if (!abbrev)
1655 return sha1_to_hex(sha1);
1656 abblen = strlen(abbrev);
1657 if (abblen < 37) {
1658 static char hex[41];
1659 if (len < abblen && abblen <= len + 2)
1660 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
1661 else
1662 sprintf(hex, "%s...", abbrev);
1663 return hex;
1664 }
1665 return sha1_to_hex(sha1);
1666 }
1667
1668 static void diff_flush_raw(struct diff_filepair *p,
1669 int line_termination,
1670 int inter_name_termination,
1671 struct diff_options *options,
1672 int output_format)
1673 {
1674 int two_paths;
1675 char status[10];
1676 int abbrev = options->abbrev;
1677 const char *path_one, *path_two;
1678
1679 path_one = p->one->path;
1680 path_two = p->two->path;
1681 if (line_termination) {
1682 path_one = quote_one(path_one);
1683 path_two = quote_one(path_two);
1684 }
1685
1686 if (p->score)
1687 sprintf(status, "%c%03d", p->status,
1688 (int)(0.5 + p->score * 100.0/MAX_SCORE));
1689 else {
1690 status[0] = p->status;
1691 status[1] = 0;
1692 }
1693 switch (p->status) {
1694 case DIFF_STATUS_COPIED:
1695 case DIFF_STATUS_RENAMED:
1696 two_paths = 1;
1697 break;
1698 case DIFF_STATUS_ADDED:
1699 case DIFF_STATUS_DELETED:
1700 two_paths = 0;
1701 break;
1702 default:
1703 two_paths = 0;
1704 break;
1705 }
1706 if (output_format != DIFF_FORMAT_NAME_STATUS) {
1707 printf(":%06o %06o %s ",
1708 p->one->mode, p->two->mode,
1709 diff_unique_abbrev(p->one->sha1, abbrev));
1710 printf("%s ",
1711 diff_unique_abbrev(p->two->sha1, abbrev));
1712 }
1713 printf("%s%c%s", status, inter_name_termination, path_one);
1714 if (two_paths)
1715 printf("%c%s", inter_name_termination, path_two);
1716 putchar(line_termination);
1717 if (path_one != p->one->path)
1718 free((void*)path_one);
1719 if (path_two != p->two->path)
1720 free((void*)path_two);
1721 }
1722
1723 static void diff_flush_name(struct diff_filepair *p, int line_termination)
1724 {
1725 char *path = p->two->path;
1726
1727 if (line_termination)
1728 path = quote_one(p->two->path);
1729 printf("%s%c", path, line_termination);
1730 if (p->two->path != path)
1731 free(path);
1732 }
1733
1734 int diff_unmodified_pair(struct diff_filepair *p)
1735 {
1736 /* This function is written stricter than necessary to support
1737 * the currently implemented transformers, but the idea is to
1738 * let transformers to produce diff_filepairs any way they want,
1739 * and filter and clean them up here before producing the output.
1740 */
1741 struct diff_filespec *one, *two;
1742
1743 if (DIFF_PAIR_UNMERGED(p))
1744 return 0; /* unmerged is interesting */
1745
1746 one = p->one;
1747 two = p->two;
1748
1749 /* deletion, addition, mode or type change
1750 * and rename are all interesting.
1751 */
1752 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
1753 DIFF_PAIR_MODE_CHANGED(p) ||
1754 strcmp(one->path, two->path))
1755 return 0;
1756
1757 /* both are valid and point at the same path. that is, we are
1758 * dealing with a change.
1759 */
1760 if (one->sha1_valid && two->sha1_valid &&
1761 !memcmp(one->sha1, two->sha1, sizeof(one->sha1)))
1762 return 1; /* no change */
1763 if (!one->sha1_valid && !two->sha1_valid)
1764 return 1; /* both look at the same file on the filesystem. */
1765 return 0;
1766 }
1767
1768 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
1769 {
1770 if (diff_unmodified_pair(p))
1771 return;
1772
1773 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1774 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1775 return; /* no tree diffs in patch format */
1776
1777 run_diff(p, o);
1778 }
1779
1780 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
1781 struct diffstat_t *diffstat)
1782 {
1783 if (diff_unmodified_pair(p))
1784 return;
1785
1786 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1787 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1788 return; /* no tree diffs in patch format */
1789
1790 run_diffstat(p, o, diffstat);
1791 }
1792
1793 static void diff_flush_checkdiff(struct diff_filepair *p,
1794 struct diff_options *o)
1795 {
1796 if (diff_unmodified_pair(p))
1797 return;
1798
1799 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1800 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1801 return; /* no tree diffs in patch format */
1802
1803 run_checkdiff(p, o);
1804 }
1805
1806 int diff_queue_is_empty(void)
1807 {
1808 struct diff_queue_struct *q = &diff_queued_diff;
1809 int i;
1810 for (i = 0; i < q->nr; i++)
1811 if (!diff_unmodified_pair(q->queue[i]))
1812 return 0;
1813 return 1;
1814 }
1815
1816 #if DIFF_DEBUG
1817 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
1818 {
1819 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
1820 x, one ? one : "",
1821 s->path,
1822 DIFF_FILE_VALID(s) ? "valid" : "invalid",
1823 s->mode,
1824 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
1825 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
1826 x, one ? one : "",
1827 s->size, s->xfrm_flags);
1828 }
1829
1830 void diff_debug_filepair(const struct diff_filepair *p, int i)
1831 {
1832 diff_debug_filespec(p->one, i, "one");
1833 diff_debug_filespec(p->two, i, "two");
1834 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
1835 p->score, p->status ? p->status : '?',
1836 p->source_stays, p->broken_pair);
1837 }
1838
1839 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
1840 {
1841 int i;
1842 if (msg)
1843 fprintf(stderr, "%s\n", msg);
1844 fprintf(stderr, "q->nr = %d\n", q->nr);
1845 for (i = 0; i < q->nr; i++) {
1846 struct diff_filepair *p = q->queue[i];
1847 diff_debug_filepair(p, i);
1848 }
1849 }
1850 #endif
1851
1852 static void diff_resolve_rename_copy(void)
1853 {
1854 int i, j;
1855 struct diff_filepair *p, *pp;
1856 struct diff_queue_struct *q = &diff_queued_diff;
1857
1858 diff_debug_queue("resolve-rename-copy", q);
1859
1860 for (i = 0; i < q->nr; i++) {
1861 p = q->queue[i];
1862 p->status = 0; /* undecided */
1863 if (DIFF_PAIR_UNMERGED(p))
1864 p->status = DIFF_STATUS_UNMERGED;
1865 else if (!DIFF_FILE_VALID(p->one))
1866 p->status = DIFF_STATUS_ADDED;
1867 else if (!DIFF_FILE_VALID(p->two))
1868 p->status = DIFF_STATUS_DELETED;
1869 else if (DIFF_PAIR_TYPE_CHANGED(p))
1870 p->status = DIFF_STATUS_TYPE_CHANGED;
1871
1872 /* from this point on, we are dealing with a pair
1873 * whose both sides are valid and of the same type, i.e.
1874 * either in-place edit or rename/copy edit.
1875 */
1876 else if (DIFF_PAIR_RENAME(p)) {
1877 if (p->source_stays) {
1878 p->status = DIFF_STATUS_COPIED;
1879 continue;
1880 }
1881 /* See if there is some other filepair that
1882 * copies from the same source as us. If so
1883 * we are a copy. Otherwise we are either a
1884 * copy if the path stays, or a rename if it
1885 * does not, but we already handled "stays" case.
1886 */
1887 for (j = i + 1; j < q->nr; j++) {
1888 pp = q->queue[j];
1889 if (strcmp(pp->one->path, p->one->path))
1890 continue; /* not us */
1891 if (!DIFF_PAIR_RENAME(pp))
1892 continue; /* not a rename/copy */
1893 /* pp is a rename/copy from the same source */
1894 p->status = DIFF_STATUS_COPIED;
1895 break;
1896 }
1897 if (!p->status)
1898 p->status = DIFF_STATUS_RENAMED;
1899 }
1900 else if (memcmp(p->one->sha1, p->two->sha1, 20) ||
1901 p->one->mode != p->two->mode)
1902 p->status = DIFF_STATUS_MODIFIED;
1903 else {
1904 /* This is a "no-change" entry and should not
1905 * happen anymore, but prepare for broken callers.
1906 */
1907 error("feeding unmodified %s to diffcore",
1908 p->one->path);
1909 p->status = DIFF_STATUS_UNKNOWN;
1910 }
1911 }
1912 diff_debug_queue("resolve-rename-copy done", q);
1913 }
1914
1915 static void flush_one_pair(struct diff_filepair *p,
1916 int diff_output_format,
1917 struct diff_options *options,
1918 struct diffstat_t *diffstat)
1919 {
1920 int inter_name_termination = '\t';
1921 int line_termination = options->line_termination;
1922 if (!line_termination)
1923 inter_name_termination = 0;
1924
1925 switch (p->status) {
1926 case DIFF_STATUS_UNKNOWN:
1927 break;
1928 case 0:
1929 die("internal error in diff-resolve-rename-copy");
1930 break;
1931 default:
1932 switch (diff_output_format) {
1933 case DIFF_FORMAT_DIFFSTAT:
1934 diff_flush_stat(p, options, diffstat);
1935 break;
1936 case DIFF_FORMAT_CHECKDIFF:
1937 diff_flush_checkdiff(p, options);
1938 break;
1939 case DIFF_FORMAT_PATCH:
1940 diff_flush_patch(p, options);
1941 break;
1942 case DIFF_FORMAT_RAW:
1943 case DIFF_FORMAT_NAME_STATUS:
1944 diff_flush_raw(p, line_termination,
1945 inter_name_termination,
1946 options, diff_output_format);
1947 break;
1948 case DIFF_FORMAT_NAME:
1949 diff_flush_name(p, line_termination);
1950 break;
1951 case DIFF_FORMAT_NO_OUTPUT:
1952 break;
1953 }
1954 }
1955 }
1956
1957 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
1958 {
1959 if (fs->mode)
1960 printf(" %s mode %06o %s\n", newdelete, fs->mode, fs->path);
1961 else
1962 printf(" %s %s\n", newdelete, fs->path);
1963 }
1964
1965
1966 static void show_mode_change(struct diff_filepair *p, int show_name)
1967 {
1968 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
1969 if (show_name)
1970 printf(" mode change %06o => %06o %s\n",
1971 p->one->mode, p->two->mode, p->two->path);
1972 else
1973 printf(" mode change %06o => %06o\n",
1974 p->one->mode, p->two->mode);
1975 }
1976 }
1977
1978 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
1979 {
1980 const char *old, *new;
1981
1982 /* Find common prefix */
1983 old = p->one->path;
1984 new = p->two->path;
1985 while (1) {
1986 const char *slash_old, *slash_new;
1987 slash_old = strchr(old, '/');
1988 slash_new = strchr(new, '/');
1989 if (!slash_old ||
1990 !slash_new ||
1991 slash_old - old != slash_new - new ||
1992 memcmp(old, new, slash_new - new))
1993 break;
1994 old = slash_old + 1;
1995 new = slash_new + 1;
1996 }
1997 /* p->one->path thru old is the common prefix, and old and new
1998 * through the end of names are renames
1999 */
2000 if (old != p->one->path)
2001 printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
2002 (int)(old - p->one->path), p->one->path,
2003 old, new, (int)(0.5 + p->score * 100.0/MAX_SCORE));
2004 else
2005 printf(" %s %s => %s (%d%%)\n", renamecopy,
2006 p->one->path, p->two->path,
2007 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2008 show_mode_change(p, 0);
2009 }
2010
2011 static void diff_summary(struct diff_filepair *p)
2012 {
2013 switch(p->status) {
2014 case DIFF_STATUS_DELETED:
2015 show_file_mode_name("delete", p->one);
2016 break;
2017 case DIFF_STATUS_ADDED:
2018 show_file_mode_name("create", p->two);
2019 break;
2020 case DIFF_STATUS_COPIED:
2021 show_rename_copy("copy", p);
2022 break;
2023 case DIFF_STATUS_RENAMED:
2024 show_rename_copy("rename", p);
2025 break;
2026 default:
2027 if (p->score) {
2028 printf(" rewrite %s (%d%%)\n", p->two->path,
2029 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2030 show_mode_change(p, 0);
2031 } else show_mode_change(p, 1);
2032 break;
2033 }
2034 }
2035
2036 void diff_flush(struct diff_options *options)
2037 {
2038 struct diff_queue_struct *q = &diff_queued_diff;
2039 int i;
2040 int diff_output_format = options->output_format;
2041 struct diffstat_t *diffstat = NULL;
2042
2043 if (diff_output_format == DIFF_FORMAT_DIFFSTAT || options->with_stat) {
2044 diffstat = xcalloc(sizeof (struct diffstat_t), 1);
2045 diffstat->xm.consume = diffstat_consume;
2046 }
2047
2048 if (options->with_raw) {
2049 for (i = 0; i < q->nr; i++) {
2050 struct diff_filepair *p = q->queue[i];
2051 flush_one_pair(p, DIFF_FORMAT_RAW, options, NULL);
2052 }
2053 putchar(options->line_termination);
2054 }
2055 if (options->with_stat) {
2056 for (i = 0; i < q->nr; i++) {
2057 struct diff_filepair *p = q->queue[i];
2058 flush_one_pair(p, DIFF_FORMAT_DIFFSTAT, options,
2059 diffstat);
2060 }
2061 show_stats(diffstat);
2062 free(diffstat);
2063 diffstat = NULL;
2064 if (options->summary)
2065 for (i = 0; i < q->nr; i++)
2066 diff_summary(q->queue[i]);
2067 if (options->stat_sep)
2068 fputs(options->stat_sep, stdout);
2069 else
2070 putchar(options->line_termination);
2071 }
2072 for (i = 0; i < q->nr; i++) {
2073 struct diff_filepair *p = q->queue[i];
2074 flush_one_pair(p, diff_output_format, options, diffstat);
2075 }
2076
2077 if (diffstat) {
2078 show_stats(diffstat);
2079 free(diffstat);
2080 }
2081
2082 for (i = 0; i < q->nr; i++) {
2083 if (diffstat && options->summary)
2084 diff_summary(q->queue[i]);
2085 diff_free_filepair(q->queue[i]);
2086 }
2087
2088 free(q->queue);
2089 q->queue = NULL;
2090 q->nr = q->alloc = 0;
2091 }
2092
2093 static void diffcore_apply_filter(const char *filter)
2094 {
2095 int i;
2096 struct diff_queue_struct *q = &diff_queued_diff;
2097 struct diff_queue_struct outq;
2098 outq.queue = NULL;
2099 outq.nr = outq.alloc = 0;
2100
2101 if (!filter)
2102 return;
2103
2104 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2105 int found;
2106 for (i = found = 0; !found && i < q->nr; i++) {
2107 struct diff_filepair *p = q->queue[i];
2108 if (((p->status == DIFF_STATUS_MODIFIED) &&
2109 ((p->score &&
2110 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2111 (!p->score &&
2112 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2113 ((p->status != DIFF_STATUS_MODIFIED) &&
2114 strchr(filter, p->status)))
2115 found++;
2116 }
2117 if (found)
2118 return;
2119
2120 /* otherwise we will clear the whole queue
2121 * by copying the empty outq at the end of this
2122 * function, but first clear the current entries
2123 * in the queue.
2124 */
2125 for (i = 0; i < q->nr; i++)
2126 diff_free_filepair(q->queue[i]);
2127 }
2128 else {
2129 /* Only the matching ones */
2130 for (i = 0; i < q->nr; i++) {
2131 struct diff_filepair *p = q->queue[i];
2132
2133 if (((p->status == DIFF_STATUS_MODIFIED) &&
2134 ((p->score &&
2135 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2136 (!p->score &&
2137 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2138 ((p->status != DIFF_STATUS_MODIFIED) &&
2139 strchr(filter, p->status)))
2140 diff_q(&outq, p);
2141 else
2142 diff_free_filepair(p);
2143 }
2144 }
2145 free(q->queue);
2146 *q = outq;
2147 }
2148
2149 void diffcore_std(struct diff_options *options)
2150 {
2151 if (options->break_opt != -1)
2152 diffcore_break(options->break_opt);
2153 if (options->detect_rename)
2154 diffcore_rename(options);
2155 if (options->break_opt != -1)
2156 diffcore_merge_broken();
2157 if (options->pickaxe)
2158 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2159 if (options->orderfile)
2160 diffcore_order(options->orderfile);
2161 diff_resolve_rename_copy();
2162 diffcore_apply_filter(options->filter);
2163 }
2164
2165
2166 void diffcore_std_no_resolve(struct diff_options *options)
2167 {
2168 if (options->pickaxe)
2169 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2170 if (options->orderfile)
2171 diffcore_order(options->orderfile);
2172 diffcore_apply_filter(options->filter);
2173 }
2174
2175 void diff_addremove(struct diff_options *options,
2176 int addremove, unsigned mode,
2177 const unsigned char *sha1,
2178 const char *base, const char *path)
2179 {
2180 char concatpath[PATH_MAX];
2181 struct diff_filespec *one, *two;
2182
2183 /* This may look odd, but it is a preparation for
2184 * feeding "there are unchanged files which should
2185 * not produce diffs, but when you are doing copy
2186 * detection you would need them, so here they are"
2187 * entries to the diff-core. They will be prefixed
2188 * with something like '=' or '*' (I haven't decided
2189 * which but should not make any difference).
2190 * Feeding the same new and old to diff_change()
2191 * also has the same effect.
2192 * Before the final output happens, they are pruned after
2193 * merged into rename/copy pairs as appropriate.
2194 */
2195 if (options->reverse_diff)
2196 addremove = (addremove == '+' ? '-' :
2197 addremove == '-' ? '+' : addremove);
2198
2199 if (!path) path = "";
2200 sprintf(concatpath, "%s%s", base, path);
2201 one = alloc_filespec(concatpath);
2202 two = alloc_filespec(concatpath);
2203
2204 if (addremove != '+')
2205 fill_filespec(one, sha1, mode);
2206 if (addremove != '-')
2207 fill_filespec(two, sha1, mode);
2208
2209 diff_queue(&diff_queued_diff, one, two);
2210 }
2211
2212 void diff_change(struct diff_options *options,
2213 unsigned old_mode, unsigned new_mode,
2214 const unsigned char *old_sha1,
2215 const unsigned char *new_sha1,
2216 const char *base, const char *path)
2217 {
2218 char concatpath[PATH_MAX];
2219 struct diff_filespec *one, *two;
2220
2221 if (options->reverse_diff) {
2222 unsigned tmp;
2223 const unsigned char *tmp_c;
2224 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
2225 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
2226 }
2227 if (!path) path = "";
2228 sprintf(concatpath, "%s%s", base, path);
2229 one = alloc_filespec(concatpath);
2230 two = alloc_filespec(concatpath);
2231 fill_filespec(one, old_sha1, old_mode);
2232 fill_filespec(two, new_sha1, new_mode);
2233
2234 diff_queue(&diff_queued_diff, one, two);
2235 }
2236
2237 void diff_unmerge(struct diff_options *options,
2238 const char *path)
2239 {
2240 struct diff_filespec *one, *two;
2241 one = alloc_filespec(path);
2242 two = alloc_filespec(path);
2243 diff_queue(&diff_queued_diff, one, two);
2244 }