Merge branch 'jc/show-merge'
[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 static int diff_detect_rename_default = 0;
17 static int diff_rename_limit_default = -1;
18 static int diff_use_color_default = 0;
19
20 enum color_diff {
21 DIFF_RESET = 0,
22 DIFF_PLAIN = 1,
23 DIFF_METAINFO = 2,
24 DIFF_FRAGINFO = 3,
25 DIFF_FILE_OLD = 4,
26 DIFF_FILE_NEW = 5,
27 };
28
29 #define COLOR_NORMAL ""
30 #define COLOR_BOLD "\033[1m"
31 #define COLOR_DIM "\033[2m"
32 #define COLOR_UL "\033[4m"
33 #define COLOR_BLINK "\033[5m"
34 #define COLOR_REVERSE "\033[7m"
35 #define COLOR_RESET "\033[m"
36
37 #define COLOR_BLACK "\033[30m"
38 #define COLOR_RED "\033[31m"
39 #define COLOR_GREEN "\033[32m"
40 #define COLOR_YELLOW "\033[33m"
41 #define COLOR_BLUE "\033[34m"
42 #define COLOR_MAGENTA "\033[35m"
43 #define COLOR_CYAN "\033[36m"
44 #define COLOR_WHITE "\033[37m"
45
46 static const char *diff_colors[] = {
47 COLOR_RESET,
48 COLOR_NORMAL,
49 COLOR_BOLD,
50 COLOR_CYAN,
51 COLOR_RED,
52 COLOR_GREEN
53 };
54
55 static int parse_diff_color_slot(const char *var, int ofs)
56 {
57 if (!strcasecmp(var+ofs, "plain"))
58 return DIFF_PLAIN;
59 if (!strcasecmp(var+ofs, "meta"))
60 return DIFF_METAINFO;
61 if (!strcasecmp(var+ofs, "frag"))
62 return DIFF_FRAGINFO;
63 if (!strcasecmp(var+ofs, "old"))
64 return DIFF_FILE_OLD;
65 if (!strcasecmp(var+ofs, "new"))
66 return DIFF_FILE_NEW;
67 die("bad config variable '%s'", var);
68 }
69
70 static const char *parse_diff_color_value(const char *value, const char *var)
71 {
72 if (!strcasecmp(value, "normal"))
73 return COLOR_NORMAL;
74 if (!strcasecmp(value, "bold"))
75 return COLOR_BOLD;
76 if (!strcasecmp(value, "dim"))
77 return COLOR_DIM;
78 if (!strcasecmp(value, "ul"))
79 return COLOR_UL;
80 if (!strcasecmp(value, "blink"))
81 return COLOR_BLINK;
82 if (!strcasecmp(value, "reverse"))
83 return COLOR_REVERSE;
84 if (!strcasecmp(value, "reset"))
85 return COLOR_RESET;
86 if (!strcasecmp(value, "black"))
87 return COLOR_BLACK;
88 if (!strcasecmp(value, "red"))
89 return COLOR_RED;
90 if (!strcasecmp(value, "green"))
91 return COLOR_GREEN;
92 if (!strcasecmp(value, "yellow"))
93 return COLOR_YELLOW;
94 if (!strcasecmp(value, "blue"))
95 return COLOR_BLUE;
96 if (!strcasecmp(value, "magenta"))
97 return COLOR_MAGENTA;
98 if (!strcasecmp(value, "cyan"))
99 return COLOR_CYAN;
100 if (!strcasecmp(value, "white"))
101 return COLOR_WHITE;
102 die("bad config value '%s' for variable '%s'", value, var);
103 }
104
105 /*
106 * These are to give UI layer defaults.
107 * The core-level commands such as git-diff-files should
108 * never be affected by the setting of diff.renames
109 * the user happens to have in the configuration file.
110 */
111 int git_diff_ui_config(const char *var, const char *value)
112 {
113 if (!strcmp(var, "diff.renamelimit")) {
114 diff_rename_limit_default = git_config_int(var, value);
115 return 0;
116 }
117 if (!strcmp(var, "diff.color")) {
118 if (!value)
119 diff_use_color_default = 1; /* bool */
120 else if (!strcasecmp(value, "auto")) {
121 diff_use_color_default = 0;
122 if (isatty(1) || pager_in_use) {
123 char *term = getenv("TERM");
124 if (term && strcmp(term, "dumb"))
125 diff_use_color_default = 1;
126 }
127 }
128 else if (!strcasecmp(value, "never"))
129 diff_use_color_default = 0;
130 else if (!strcasecmp(value, "always"))
131 diff_use_color_default = 1;
132 else
133 diff_use_color_default = git_config_bool(var, value);
134 return 0;
135 }
136 if (!strcmp(var, "diff.renames")) {
137 if (!value)
138 diff_detect_rename_default = DIFF_DETECT_RENAME;
139 else if (!strcasecmp(value, "copies") ||
140 !strcasecmp(value, "copy"))
141 diff_detect_rename_default = DIFF_DETECT_COPY;
142 else if (git_config_bool(var,value))
143 diff_detect_rename_default = DIFF_DETECT_RENAME;
144 return 0;
145 }
146 if (!strncmp(var, "diff.color.", 11)) {
147 int slot = parse_diff_color_slot(var, 11);
148 diff_colors[slot] = parse_diff_color_value(value, var);
149 return 0;
150 }
151 return git_default_config(var, value);
152 }
153
154 static char *quote_one(const char *str)
155 {
156 int needlen;
157 char *xp;
158
159 if (!str)
160 return NULL;
161 needlen = quote_c_style(str, NULL, NULL, 0);
162 if (!needlen)
163 return strdup(str);
164 xp = xmalloc(needlen + 1);
165 quote_c_style(str, xp, NULL, 0);
166 return xp;
167 }
168
169 static char *quote_two(const char *one, const char *two)
170 {
171 int need_one = quote_c_style(one, NULL, NULL, 1);
172 int need_two = quote_c_style(two, NULL, NULL, 1);
173 char *xp;
174
175 if (need_one + need_two) {
176 if (!need_one) need_one = strlen(one);
177 if (!need_two) need_one = strlen(two);
178
179 xp = xmalloc(need_one + need_two + 3);
180 xp[0] = '"';
181 quote_c_style(one, xp + 1, NULL, 1);
182 quote_c_style(two, xp + need_one + 1, NULL, 1);
183 strcpy(xp + need_one + need_two + 1, "\"");
184 return xp;
185 }
186 need_one = strlen(one);
187 need_two = strlen(two);
188 xp = xmalloc(need_one + need_two + 1);
189 strcpy(xp, one);
190 strcpy(xp + need_one, two);
191 return xp;
192 }
193
194 static const char *external_diff(void)
195 {
196 static const char *external_diff_cmd = NULL;
197 static int done_preparing = 0;
198
199 if (done_preparing)
200 return external_diff_cmd;
201 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
202 done_preparing = 1;
203 return external_diff_cmd;
204 }
205
206 #define TEMPFILE_PATH_LEN 50
207
208 static struct diff_tempfile {
209 const char *name; /* filename external diff should read from */
210 char hex[41];
211 char mode[10];
212 char tmp_path[TEMPFILE_PATH_LEN];
213 } diff_temp[2];
214
215 static int count_lines(const char *data, int size)
216 {
217 int count, ch, completely_empty = 1, nl_just_seen = 0;
218 count = 0;
219 while (0 < size--) {
220 ch = *data++;
221 if (ch == '\n') {
222 count++;
223 nl_just_seen = 1;
224 completely_empty = 0;
225 }
226 else {
227 nl_just_seen = 0;
228 completely_empty = 0;
229 }
230 }
231 if (completely_empty)
232 return 0;
233 if (!nl_just_seen)
234 count++; /* no trailing newline */
235 return count;
236 }
237
238 static void print_line_count(int count)
239 {
240 switch (count) {
241 case 0:
242 printf("0,0");
243 break;
244 case 1:
245 printf("1");
246 break;
247 default:
248 printf("1,%d", count);
249 break;
250 }
251 }
252
253 static void copy_file(int prefix, const char *data, int size)
254 {
255 int ch, nl_just_seen = 1;
256 while (0 < size--) {
257 ch = *data++;
258 if (nl_just_seen)
259 putchar(prefix);
260 putchar(ch);
261 if (ch == '\n')
262 nl_just_seen = 1;
263 else
264 nl_just_seen = 0;
265 }
266 if (!nl_just_seen)
267 printf("\n\\ No newline at end of file\n");
268 }
269
270 static void emit_rewrite_diff(const char *name_a,
271 const char *name_b,
272 struct diff_filespec *one,
273 struct diff_filespec *two)
274 {
275 int lc_a, lc_b;
276 diff_populate_filespec(one, 0);
277 diff_populate_filespec(two, 0);
278 lc_a = count_lines(one->data, one->size);
279 lc_b = count_lines(two->data, two->size);
280 printf("--- %s\n+++ %s\n@@ -", name_a, name_b);
281 print_line_count(lc_a);
282 printf(" +");
283 print_line_count(lc_b);
284 printf(" @@\n");
285 if (lc_a)
286 copy_file('-', one->data, one->size);
287 if (lc_b)
288 copy_file('+', two->data, two->size);
289 }
290
291 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
292 {
293 if (!DIFF_FILE_VALID(one)) {
294 mf->ptr = (char *)""; /* does not matter */
295 mf->size = 0;
296 return 0;
297 }
298 else if (diff_populate_filespec(one, 0))
299 return -1;
300 mf->ptr = one->data;
301 mf->size = one->size;
302 return 0;
303 }
304
305 struct emit_callback {
306 struct xdiff_emit_state xm;
307 int nparents, color_diff;
308 const char **label_path;
309 };
310
311 static inline const char *get_color(int diff_use_color, enum color_diff ix)
312 {
313 if (diff_use_color)
314 return diff_colors[ix];
315 return "";
316 }
317
318 static void fn_out_consume(void *priv, char *line, unsigned long len)
319 {
320 int i;
321 struct emit_callback *ecbdata = priv;
322 const char *set = get_color(ecbdata->color_diff, DIFF_METAINFO);
323 const char *reset = get_color(ecbdata->color_diff, DIFF_RESET);
324
325 if (ecbdata->label_path[0]) {
326 printf("%s--- %s%s\n", set, ecbdata->label_path[0], reset);
327 printf("%s+++ %s%s\n", set, ecbdata->label_path[1], reset);
328 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
329 }
330
331 /* This is not really necessary for now because
332 * this codepath only deals with two-way diffs.
333 */
334 for (i = 0; i < len && line[i] == '@'; i++)
335 ;
336 if (2 <= i && i < len && line[i] == ' ') {
337 ecbdata->nparents = i - 1;
338 set = get_color(ecbdata->color_diff, DIFF_FRAGINFO);
339 }
340 else if (len < ecbdata->nparents)
341 set = reset;
342 else {
343 int nparents = ecbdata->nparents;
344 int color = DIFF_PLAIN;
345 for (i = 0; i < nparents && len; i++) {
346 if (line[i] == '-')
347 color = DIFF_FILE_OLD;
348 else if (line[i] == '+')
349 color = DIFF_FILE_NEW;
350 }
351 set = get_color(ecbdata->color_diff, color);
352 }
353 if (len > 0 && line[len-1] == '\n')
354 len--;
355 fputs (set, stdout);
356 fwrite (line, len, 1, stdout);
357 puts (reset);
358 }
359
360 static char *pprint_rename(const char *a, const char *b)
361 {
362 const char *old = a;
363 const char *new = b;
364 char *name = NULL;
365 int pfx_length, sfx_length;
366 int len_a = strlen(a);
367 int len_b = strlen(b);
368
369 /* Find common prefix */
370 pfx_length = 0;
371 while (*old && *new && *old == *new) {
372 if (*old == '/')
373 pfx_length = old - a + 1;
374 old++;
375 new++;
376 }
377
378 /* Find common suffix */
379 old = a + len_a;
380 new = b + len_b;
381 sfx_length = 0;
382 while (a <= old && b <= new && *old == *new) {
383 if (*old == '/')
384 sfx_length = len_a - (old - a);
385 old--;
386 new--;
387 }
388
389 /*
390 * pfx{mid-a => mid-b}sfx
391 * {pfx-a => pfx-b}sfx
392 * pfx{sfx-a => sfx-b}
393 * name-a => name-b
394 */
395 if (pfx_length + sfx_length) {
396 int a_midlen = len_a - pfx_length - sfx_length;
397 int b_midlen = len_b - pfx_length - sfx_length;
398 if (a_midlen < 0) a_midlen = 0;
399 if (b_midlen < 0) b_midlen = 0;
400
401 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
402 sprintf(name, "%.*s{%.*s => %.*s}%s",
403 pfx_length, a,
404 a_midlen, a + pfx_length,
405 b_midlen, b + pfx_length,
406 a + len_a - sfx_length);
407 }
408 else {
409 name = xmalloc(len_a + len_b + 5);
410 sprintf(name, "%s => %s", a, b);
411 }
412 return name;
413 }
414
415 struct diffstat_t {
416 struct xdiff_emit_state xm;
417
418 int nr;
419 int alloc;
420 struct diffstat_file {
421 char *name;
422 unsigned is_unmerged:1;
423 unsigned is_binary:1;
424 unsigned is_renamed:1;
425 unsigned int added, deleted;
426 } **files;
427 };
428
429 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
430 const char *name_a,
431 const char *name_b)
432 {
433 struct diffstat_file *x;
434 x = xcalloc(sizeof (*x), 1);
435 if (diffstat->nr == diffstat->alloc) {
436 diffstat->alloc = alloc_nr(diffstat->alloc);
437 diffstat->files = xrealloc(diffstat->files,
438 diffstat->alloc * sizeof(x));
439 }
440 diffstat->files[diffstat->nr++] = x;
441 if (name_b) {
442 x->name = pprint_rename(name_a, name_b);
443 x->is_renamed = 1;
444 }
445 else
446 x->name = strdup(name_a);
447 return x;
448 }
449
450 static void diffstat_consume(void *priv, char *line, unsigned long len)
451 {
452 struct diffstat_t *diffstat = priv;
453 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
454
455 if (line[0] == '+')
456 x->added++;
457 else if (line[0] == '-')
458 x->deleted++;
459 }
460
461 static const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
462 static const char minuses[]= "----------------------------------------------------------------------";
463 const char mime_boundary_leader[] = "------------";
464
465 static void show_stats(struct diffstat_t* data)
466 {
467 int i, len, add, del, total, adds = 0, dels = 0;
468 int max, max_change = 0, max_len = 0;
469 int total_files = data->nr;
470
471 if (data->nr == 0)
472 return;
473
474 for (i = 0; i < data->nr; i++) {
475 struct diffstat_file *file = data->files[i];
476
477 len = strlen(file->name);
478 if (max_len < len)
479 max_len = len;
480
481 if (file->is_binary || file->is_unmerged)
482 continue;
483 if (max_change < file->added + file->deleted)
484 max_change = file->added + file->deleted;
485 }
486
487 for (i = 0; i < data->nr; i++) {
488 const char *prefix = "";
489 char *name = data->files[i]->name;
490 int added = data->files[i]->added;
491 int deleted = data->files[i]->deleted;
492
493 if (0 < (len = quote_c_style(name, NULL, NULL, 0))) {
494 char *qname = xmalloc(len + 1);
495 quote_c_style(name, qname, NULL, 0);
496 free(name);
497 data->files[i]->name = name = qname;
498 }
499
500 /*
501 * "scale" the filename
502 */
503 len = strlen(name);
504 max = max_len;
505 if (max > 50)
506 max = 50;
507 if (len > max) {
508 char *slash;
509 prefix = "...";
510 max -= 3;
511 name += len - max;
512 slash = strchr(name, '/');
513 if (slash)
514 name = slash;
515 }
516 len = max;
517
518 /*
519 * scale the add/delete
520 */
521 max = max_change;
522 if (max + len > 70)
523 max = 70 - len;
524
525 if (data->files[i]->is_binary) {
526 printf(" %s%-*s | Bin\n", prefix, len, name);
527 goto free_diffstat_file;
528 }
529 else if (data->files[i]->is_unmerged) {
530 printf(" %s%-*s | Unmerged\n", prefix, len, name);
531 goto free_diffstat_file;
532 }
533 else if (!data->files[i]->is_renamed &&
534 (added + deleted == 0)) {
535 total_files--;
536 goto free_diffstat_file;
537 }
538
539 add = added;
540 del = deleted;
541 total = add + del;
542 adds += add;
543 dels += del;
544
545 if (max_change > 0) {
546 total = (total * max + max_change / 2) / max_change;
547 add = (add * max + max_change / 2) / max_change;
548 del = total - add;
549 }
550 printf(" %s%-*s |%5d %.*s%.*s\n", prefix,
551 len, name, added + deleted,
552 add, pluses, del, minuses);
553 free_diffstat_file:
554 free(data->files[i]->name);
555 free(data->files[i]);
556 }
557 free(data->files);
558 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
559 total_files, adds, dels);
560 }
561
562 struct checkdiff_t {
563 struct xdiff_emit_state xm;
564 const char *filename;
565 int lineno;
566 };
567
568 static void checkdiff_consume(void *priv, char *line, unsigned long len)
569 {
570 struct checkdiff_t *data = priv;
571
572 if (line[0] == '+') {
573 int i, spaces = 0;
574
575 data->lineno++;
576
577 /* check space before tab */
578 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
579 if (line[i] == ' ')
580 spaces++;
581 if (line[i - 1] == '\t' && spaces)
582 printf("%s:%d: space before tab:%.*s\n",
583 data->filename, data->lineno, (int)len, line);
584
585 /* check white space at line end */
586 if (line[len - 1] == '\n')
587 len--;
588 if (isspace(line[len - 1]))
589 printf("%s:%d: white space at end: %.*s\n",
590 data->filename, data->lineno, (int)len, line);
591 } else if (line[0] == ' ')
592 data->lineno++;
593 else if (line[0] == '@') {
594 char *plus = strchr(line, '+');
595 if (plus)
596 data->lineno = strtol(plus, NULL, 10);
597 else
598 die("invalid diff");
599 }
600 }
601
602 static unsigned char *deflate_it(char *data,
603 unsigned long size,
604 unsigned long *result_size)
605 {
606 int bound;
607 unsigned char *deflated;
608 z_stream stream;
609
610 memset(&stream, 0, sizeof(stream));
611 deflateInit(&stream, zlib_compression_level);
612 bound = deflateBound(&stream, size);
613 deflated = xmalloc(bound);
614 stream.next_out = deflated;
615 stream.avail_out = bound;
616
617 stream.next_in = (unsigned char *)data;
618 stream.avail_in = size;
619 while (deflate(&stream, Z_FINISH) == Z_OK)
620 ; /* nothing */
621 deflateEnd(&stream);
622 *result_size = stream.total_out;
623 return deflated;
624 }
625
626 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
627 {
628 void *cp;
629 void *delta;
630 void *deflated;
631 void *data;
632 unsigned long orig_size;
633 unsigned long delta_size;
634 unsigned long deflate_size;
635 unsigned long data_size;
636
637 printf("GIT binary patch\n");
638 /* We could do deflated delta, or we could do just deflated two,
639 * whichever is smaller.
640 */
641 delta = NULL;
642 deflated = deflate_it(two->ptr, two->size, &deflate_size);
643 if (one->size && two->size) {
644 delta = diff_delta(one->ptr, one->size,
645 two->ptr, two->size,
646 &delta_size, deflate_size);
647 if (delta) {
648 void *to_free = delta;
649 orig_size = delta_size;
650 delta = deflate_it(delta, delta_size, &delta_size);
651 free(to_free);
652 }
653 }
654
655 if (delta && delta_size < deflate_size) {
656 printf("delta %lu\n", orig_size);
657 free(deflated);
658 data = delta;
659 data_size = delta_size;
660 }
661 else {
662 printf("literal %lu\n", two->size);
663 free(delta);
664 data = deflated;
665 data_size = deflate_size;
666 }
667
668 /* emit data encoded in base85 */
669 cp = data;
670 while (data_size) {
671 int bytes = (52 < data_size) ? 52 : data_size;
672 char line[70];
673 data_size -= bytes;
674 if (bytes <= 26)
675 line[0] = bytes + 'A' - 1;
676 else
677 line[0] = bytes - 26 + 'a' - 1;
678 encode_85(line + 1, cp, bytes);
679 cp = (char *) cp + bytes;
680 puts(line);
681 }
682 printf("\n");
683 free(data);
684 }
685
686 #define FIRST_FEW_BYTES 8000
687 static int mmfile_is_binary(mmfile_t *mf)
688 {
689 long sz = mf->size;
690 if (FIRST_FEW_BYTES < sz)
691 sz = FIRST_FEW_BYTES;
692 if (memchr(mf->ptr, 0, sz))
693 return 1;
694 return 0;
695 }
696
697 static void builtin_diff(const char *name_a,
698 const char *name_b,
699 struct diff_filespec *one,
700 struct diff_filespec *two,
701 const char *xfrm_msg,
702 struct diff_options *o,
703 int complete_rewrite)
704 {
705 mmfile_t mf1, mf2;
706 const char *lbl[2];
707 char *a_one, *b_two;
708 const char *set = get_color(o->color_diff, DIFF_METAINFO);
709 const char *reset = get_color(o->color_diff, DIFF_RESET);
710
711 a_one = quote_two("a/", name_a);
712 b_two = quote_two("b/", name_b);
713 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
714 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
715 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
716 if (lbl[0][0] == '/') {
717 /* /dev/null */
718 printf("%snew file mode %06o%s\n", set, two->mode, reset);
719 if (xfrm_msg && xfrm_msg[0])
720 printf("%s%s%s\n", set, xfrm_msg, reset);
721 }
722 else if (lbl[1][0] == '/') {
723 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
724 if (xfrm_msg && xfrm_msg[0])
725 printf("%s%s%s\n", set, xfrm_msg, reset);
726 }
727 else {
728 if (one->mode != two->mode) {
729 printf("%sold mode %06o%s\n", set, one->mode, reset);
730 printf("%snew mode %06o%s\n", set, two->mode, reset);
731 }
732 if (xfrm_msg && xfrm_msg[0])
733 printf("%s%s%s\n", set, xfrm_msg, reset);
734 /*
735 * we do not run diff between different kind
736 * of objects.
737 */
738 if ((one->mode ^ two->mode) & S_IFMT)
739 goto free_ab_and_return;
740 if (complete_rewrite) {
741 emit_rewrite_diff(name_a, name_b, one, two);
742 goto free_ab_and_return;
743 }
744 }
745
746 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
747 die("unable to read files to diff");
748
749 if (!o->text && (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))) {
750 /* Quite common confusing case */
751 if (mf1.size == mf2.size &&
752 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
753 goto free_ab_and_return;
754 if (o->binary)
755 emit_binary_diff(&mf1, &mf2);
756 else
757 printf("Binary files %s and %s differ\n",
758 lbl[0], lbl[1]);
759 }
760 else {
761 /* Crazy xdl interfaces.. */
762 const char *diffopts = getenv("GIT_DIFF_OPTS");
763 xpparam_t xpp;
764 xdemitconf_t xecfg;
765 xdemitcb_t ecb;
766 struct emit_callback ecbdata;
767
768 memset(&ecbdata, 0, sizeof(ecbdata));
769 ecbdata.label_path = lbl;
770 ecbdata.color_diff = o->color_diff;
771 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
772 xecfg.ctxlen = o->context;
773 xecfg.flags = XDL_EMIT_FUNCNAMES;
774 if (!diffopts)
775 ;
776 else if (!strncmp(diffopts, "--unified=", 10))
777 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
778 else if (!strncmp(diffopts, "-u", 2))
779 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
780 ecb.outf = xdiff_outf;
781 ecb.priv = &ecbdata;
782 ecbdata.xm.consume = fn_out_consume;
783 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
784 }
785
786 free_ab_and_return:
787 free(a_one);
788 free(b_two);
789 return;
790 }
791
792 static void builtin_diffstat(const char *name_a, const char *name_b,
793 struct diff_filespec *one,
794 struct diff_filespec *two,
795 struct diffstat_t *diffstat,
796 struct diff_options *o,
797 int complete_rewrite)
798 {
799 mmfile_t mf1, mf2;
800 struct diffstat_file *data;
801
802 data = diffstat_add(diffstat, name_a, name_b);
803
804 if (!one || !two) {
805 data->is_unmerged = 1;
806 return;
807 }
808 if (complete_rewrite) {
809 diff_populate_filespec(one, 0);
810 diff_populate_filespec(two, 0);
811 data->deleted = count_lines(one->data, one->size);
812 data->added = count_lines(two->data, two->size);
813 return;
814 }
815 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
816 die("unable to read files to diff");
817
818 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
819 data->is_binary = 1;
820 else {
821 /* Crazy xdl interfaces.. */
822 xpparam_t xpp;
823 xdemitconf_t xecfg;
824 xdemitcb_t ecb;
825
826 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
827 xecfg.ctxlen = 0;
828 xecfg.flags = 0;
829 ecb.outf = xdiff_outf;
830 ecb.priv = diffstat;
831 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
832 }
833 }
834
835 static void builtin_checkdiff(const char *name_a, const char *name_b,
836 struct diff_filespec *one,
837 struct diff_filespec *two)
838 {
839 mmfile_t mf1, mf2;
840 struct checkdiff_t data;
841
842 if (!two)
843 return;
844
845 memset(&data, 0, sizeof(data));
846 data.xm.consume = checkdiff_consume;
847 data.filename = name_b ? name_b : name_a;
848 data.lineno = 0;
849
850 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
851 die("unable to read files to diff");
852
853 if (mmfile_is_binary(&mf2))
854 return;
855 else {
856 /* Crazy xdl interfaces.. */
857 xpparam_t xpp;
858 xdemitconf_t xecfg;
859 xdemitcb_t ecb;
860
861 xpp.flags = XDF_NEED_MINIMAL;
862 xecfg.ctxlen = 0;
863 xecfg.flags = 0;
864 ecb.outf = xdiff_outf;
865 ecb.priv = &data;
866 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
867 }
868 }
869
870 struct diff_filespec *alloc_filespec(const char *path)
871 {
872 int namelen = strlen(path);
873 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
874
875 memset(spec, 0, sizeof(*spec));
876 spec->path = (char *)(spec + 1);
877 memcpy(spec->path, path, namelen+1);
878 return spec;
879 }
880
881 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
882 unsigned short mode)
883 {
884 if (mode) {
885 spec->mode = canon_mode(mode);
886 memcpy(spec->sha1, sha1, 20);
887 spec->sha1_valid = !!memcmp(sha1, null_sha1, 20);
888 }
889 }
890
891 /*
892 * Given a name and sha1 pair, if the dircache tells us the file in
893 * the work tree has that object contents, return true, so that
894 * prepare_temp_file() does not have to inflate and extract.
895 */
896 static int work_tree_matches(const char *name, const unsigned char *sha1)
897 {
898 struct cache_entry *ce;
899 struct stat st;
900 int pos, len;
901
902 /* We do not read the cache ourselves here, because the
903 * benchmark with my previous version that always reads cache
904 * shows that it makes things worse for diff-tree comparing
905 * two linux-2.6 kernel trees in an already checked out work
906 * tree. This is because most diff-tree comparisons deal with
907 * only a small number of files, while reading the cache is
908 * expensive for a large project, and its cost outweighs the
909 * savings we get by not inflating the object to a temporary
910 * file. Practically, this code only helps when we are used
911 * by diff-cache --cached, which does read the cache before
912 * calling us.
913 */
914 if (!active_cache)
915 return 0;
916
917 len = strlen(name);
918 pos = cache_name_pos(name, len);
919 if (pos < 0)
920 return 0;
921 ce = active_cache[pos];
922 if ((lstat(name, &st) < 0) ||
923 !S_ISREG(st.st_mode) || /* careful! */
924 ce_match_stat(ce, &st, 0) ||
925 memcmp(sha1, ce->sha1, 20))
926 return 0;
927 /* we return 1 only when we can stat, it is a regular file,
928 * stat information matches, and sha1 recorded in the cache
929 * matches. I.e. we know the file in the work tree really is
930 * the same as the <name, sha1> pair.
931 */
932 return 1;
933 }
934
935 static struct sha1_size_cache {
936 unsigned char sha1[20];
937 unsigned long size;
938 } **sha1_size_cache;
939 static int sha1_size_cache_nr, sha1_size_cache_alloc;
940
941 static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
942 int find_only,
943 unsigned long size)
944 {
945 int first, last;
946 struct sha1_size_cache *e;
947
948 first = 0;
949 last = sha1_size_cache_nr;
950 while (last > first) {
951 int cmp, next = (last + first) >> 1;
952 e = sha1_size_cache[next];
953 cmp = memcmp(e->sha1, sha1, 20);
954 if (!cmp)
955 return e;
956 if (cmp < 0) {
957 last = next;
958 continue;
959 }
960 first = next+1;
961 }
962 /* not found */
963 if (find_only)
964 return NULL;
965 /* insert to make it at "first" */
966 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
967 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
968 sha1_size_cache = xrealloc(sha1_size_cache,
969 sha1_size_cache_alloc *
970 sizeof(*sha1_size_cache));
971 }
972 sha1_size_cache_nr++;
973 if (first < sha1_size_cache_nr)
974 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
975 (sha1_size_cache_nr - first - 1) *
976 sizeof(*sha1_size_cache));
977 e = xmalloc(sizeof(struct sha1_size_cache));
978 sha1_size_cache[first] = e;
979 memcpy(e->sha1, sha1, 20);
980 e->size = size;
981 return e;
982 }
983
984 /*
985 * While doing rename detection and pickaxe operation, we may need to
986 * grab the data for the blob (or file) for our own in-core comparison.
987 * diff_filespec has data and size fields for this purpose.
988 */
989 int diff_populate_filespec(struct diff_filespec *s, int size_only)
990 {
991 int err = 0;
992 if (!DIFF_FILE_VALID(s))
993 die("internal error: asking to populate invalid file.");
994 if (S_ISDIR(s->mode))
995 return -1;
996
997 if (!use_size_cache)
998 size_only = 0;
999
1000 if (s->data)
1001 return err;
1002 if (!s->sha1_valid ||
1003 work_tree_matches(s->path, s->sha1)) {
1004 struct stat st;
1005 int fd;
1006 if (lstat(s->path, &st) < 0) {
1007 if (errno == ENOENT) {
1008 err_empty:
1009 err = -1;
1010 empty:
1011 s->data = (char *)"";
1012 s->size = 0;
1013 return err;
1014 }
1015 }
1016 s->size = st.st_size;
1017 if (!s->size)
1018 goto empty;
1019 if (size_only)
1020 return 0;
1021 if (S_ISLNK(st.st_mode)) {
1022 int ret;
1023 s->data = xmalloc(s->size);
1024 s->should_free = 1;
1025 ret = readlink(s->path, s->data, s->size);
1026 if (ret < 0) {
1027 free(s->data);
1028 goto err_empty;
1029 }
1030 return 0;
1031 }
1032 fd = open(s->path, O_RDONLY);
1033 if (fd < 0)
1034 goto err_empty;
1035 s->data = mmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1036 close(fd);
1037 if (s->data == MAP_FAILED)
1038 goto err_empty;
1039 s->should_munmap = 1;
1040 }
1041 else {
1042 char type[20];
1043 struct sha1_size_cache *e;
1044
1045 if (size_only) {
1046 e = locate_size_cache(s->sha1, 1, 0);
1047 if (e) {
1048 s->size = e->size;
1049 return 0;
1050 }
1051 if (!sha1_object_info(s->sha1, type, &s->size))
1052 locate_size_cache(s->sha1, 0, s->size);
1053 }
1054 else {
1055 s->data = read_sha1_file(s->sha1, type, &s->size);
1056 s->should_free = 1;
1057 }
1058 }
1059 return 0;
1060 }
1061
1062 void diff_free_filespec_data(struct diff_filespec *s)
1063 {
1064 if (s->should_free)
1065 free(s->data);
1066 else if (s->should_munmap)
1067 munmap(s->data, s->size);
1068 s->should_free = s->should_munmap = 0;
1069 s->data = NULL;
1070 free(s->cnt_data);
1071 s->cnt_data = NULL;
1072 }
1073
1074 static void prep_temp_blob(struct diff_tempfile *temp,
1075 void *blob,
1076 unsigned long size,
1077 const unsigned char *sha1,
1078 int mode)
1079 {
1080 int fd;
1081
1082 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
1083 if (fd < 0)
1084 die("unable to create temp-file");
1085 if (write(fd, blob, size) != size)
1086 die("unable to write temp-file");
1087 close(fd);
1088 temp->name = temp->tmp_path;
1089 strcpy(temp->hex, sha1_to_hex(sha1));
1090 temp->hex[40] = 0;
1091 sprintf(temp->mode, "%06o", mode);
1092 }
1093
1094 static void prepare_temp_file(const char *name,
1095 struct diff_tempfile *temp,
1096 struct diff_filespec *one)
1097 {
1098 if (!DIFF_FILE_VALID(one)) {
1099 not_a_valid_file:
1100 /* A '-' entry produces this for file-2, and
1101 * a '+' entry produces this for file-1.
1102 */
1103 temp->name = "/dev/null";
1104 strcpy(temp->hex, ".");
1105 strcpy(temp->mode, ".");
1106 return;
1107 }
1108
1109 if (!one->sha1_valid ||
1110 work_tree_matches(name, one->sha1)) {
1111 struct stat st;
1112 if (lstat(name, &st) < 0) {
1113 if (errno == ENOENT)
1114 goto not_a_valid_file;
1115 die("stat(%s): %s", name, strerror(errno));
1116 }
1117 if (S_ISLNK(st.st_mode)) {
1118 int ret;
1119 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1120 if (sizeof(buf) <= st.st_size)
1121 die("symlink too long: %s", name);
1122 ret = readlink(name, buf, st.st_size);
1123 if (ret < 0)
1124 die("readlink(%s)", name);
1125 prep_temp_blob(temp, buf, st.st_size,
1126 (one->sha1_valid ?
1127 one->sha1 : null_sha1),
1128 (one->sha1_valid ?
1129 one->mode : S_IFLNK));
1130 }
1131 else {
1132 /* we can borrow from the file in the work tree */
1133 temp->name = name;
1134 if (!one->sha1_valid)
1135 strcpy(temp->hex, sha1_to_hex(null_sha1));
1136 else
1137 strcpy(temp->hex, sha1_to_hex(one->sha1));
1138 /* Even though we may sometimes borrow the
1139 * contents from the work tree, we always want
1140 * one->mode. mode is trustworthy even when
1141 * !(one->sha1_valid), as long as
1142 * DIFF_FILE_VALID(one).
1143 */
1144 sprintf(temp->mode, "%06o", one->mode);
1145 }
1146 return;
1147 }
1148 else {
1149 if (diff_populate_filespec(one, 0))
1150 die("cannot read data blob for %s", one->path);
1151 prep_temp_blob(temp, one->data, one->size,
1152 one->sha1, one->mode);
1153 }
1154 }
1155
1156 static void remove_tempfile(void)
1157 {
1158 int i;
1159
1160 for (i = 0; i < 2; i++)
1161 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1162 unlink(diff_temp[i].name);
1163 diff_temp[i].name = NULL;
1164 }
1165 }
1166
1167 static void remove_tempfile_on_signal(int signo)
1168 {
1169 remove_tempfile();
1170 signal(SIGINT, SIG_DFL);
1171 raise(signo);
1172 }
1173
1174 static int spawn_prog(const char *pgm, const char **arg)
1175 {
1176 pid_t pid;
1177 int status;
1178
1179 fflush(NULL);
1180 pid = fork();
1181 if (pid < 0)
1182 die("unable to fork");
1183 if (!pid) {
1184 execvp(pgm, (char *const*) arg);
1185 exit(255);
1186 }
1187
1188 while (waitpid(pid, &status, 0) < 0) {
1189 if (errno == EINTR)
1190 continue;
1191 return -1;
1192 }
1193
1194 /* Earlier we did not check the exit status because
1195 * diff exits non-zero if files are different, and
1196 * we are not interested in knowing that. It was a
1197 * mistake which made it harder to quit a diff-*
1198 * session that uses the git-apply-patch-script as
1199 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1200 * should also exit non-zero only when it wants to
1201 * abort the entire diff-* session.
1202 */
1203 if (WIFEXITED(status) && !WEXITSTATUS(status))
1204 return 0;
1205 return -1;
1206 }
1207
1208 /* An external diff command takes:
1209 *
1210 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1211 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1212 *
1213 */
1214 static void run_external_diff(const char *pgm,
1215 const char *name,
1216 const char *other,
1217 struct diff_filespec *one,
1218 struct diff_filespec *two,
1219 const char *xfrm_msg,
1220 int complete_rewrite)
1221 {
1222 const char *spawn_arg[10];
1223 struct diff_tempfile *temp = diff_temp;
1224 int retval;
1225 static int atexit_asked = 0;
1226 const char *othername;
1227 const char **arg = &spawn_arg[0];
1228
1229 othername = (other? other : name);
1230 if (one && two) {
1231 prepare_temp_file(name, &temp[0], one);
1232 prepare_temp_file(othername, &temp[1], two);
1233 if (! atexit_asked &&
1234 (temp[0].name == temp[0].tmp_path ||
1235 temp[1].name == temp[1].tmp_path)) {
1236 atexit_asked = 1;
1237 atexit(remove_tempfile);
1238 }
1239 signal(SIGINT, remove_tempfile_on_signal);
1240 }
1241
1242 if (one && two) {
1243 *arg++ = pgm;
1244 *arg++ = name;
1245 *arg++ = temp[0].name;
1246 *arg++ = temp[0].hex;
1247 *arg++ = temp[0].mode;
1248 *arg++ = temp[1].name;
1249 *arg++ = temp[1].hex;
1250 *arg++ = temp[1].mode;
1251 if (other) {
1252 *arg++ = other;
1253 *arg++ = xfrm_msg;
1254 }
1255 } else {
1256 *arg++ = pgm;
1257 *arg++ = name;
1258 }
1259 *arg = NULL;
1260 retval = spawn_prog(pgm, spawn_arg);
1261 remove_tempfile();
1262 if (retval) {
1263 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1264 exit(1);
1265 }
1266 }
1267
1268 static void run_diff_cmd(const char *pgm,
1269 const char *name,
1270 const char *other,
1271 struct diff_filespec *one,
1272 struct diff_filespec *two,
1273 const char *xfrm_msg,
1274 struct diff_options *o,
1275 int complete_rewrite)
1276 {
1277 if (pgm) {
1278 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1279 complete_rewrite);
1280 return;
1281 }
1282 if (one && two)
1283 builtin_diff(name, other ? other : name,
1284 one, two, xfrm_msg, o, complete_rewrite);
1285 else
1286 printf("* Unmerged path %s\n", name);
1287 }
1288
1289 static void diff_fill_sha1_info(struct diff_filespec *one)
1290 {
1291 if (DIFF_FILE_VALID(one)) {
1292 if (!one->sha1_valid) {
1293 struct stat st;
1294 if (lstat(one->path, &st) < 0)
1295 die("stat %s", one->path);
1296 if (index_path(one->sha1, one->path, &st, 0))
1297 die("cannot hash %s\n", one->path);
1298 }
1299 }
1300 else
1301 memset(one->sha1, 0, 20);
1302 }
1303
1304 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1305 {
1306 const char *pgm = external_diff();
1307 char msg[PATH_MAX*2+300], *xfrm_msg;
1308 struct diff_filespec *one;
1309 struct diff_filespec *two;
1310 const char *name;
1311 const char *other;
1312 char *name_munged, *other_munged;
1313 int complete_rewrite = 0;
1314 int len;
1315
1316 if (DIFF_PAIR_UNMERGED(p)) {
1317 /* unmerged */
1318 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1319 return;
1320 }
1321
1322 name = p->one->path;
1323 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1324 name_munged = quote_one(name);
1325 other_munged = quote_one(other);
1326 one = p->one; two = p->two;
1327
1328 diff_fill_sha1_info(one);
1329 diff_fill_sha1_info(two);
1330
1331 len = 0;
1332 switch (p->status) {
1333 case DIFF_STATUS_COPIED:
1334 len += snprintf(msg + len, sizeof(msg) - len,
1335 "similarity index %d%%\n"
1336 "copy from %s\n"
1337 "copy to %s\n",
1338 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1339 name_munged, other_munged);
1340 break;
1341 case DIFF_STATUS_RENAMED:
1342 len += snprintf(msg + len, sizeof(msg) - len,
1343 "similarity index %d%%\n"
1344 "rename from %s\n"
1345 "rename to %s\n",
1346 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1347 name_munged, other_munged);
1348 break;
1349 case DIFF_STATUS_MODIFIED:
1350 if (p->score) {
1351 len += snprintf(msg + len, sizeof(msg) - len,
1352 "dissimilarity index %d%%\n",
1353 (int)(0.5 + p->score *
1354 100.0/MAX_SCORE));
1355 complete_rewrite = 1;
1356 break;
1357 }
1358 /* fallthru */
1359 default:
1360 /* nothing */
1361 ;
1362 }
1363
1364 if (memcmp(one->sha1, two->sha1, 20)) {
1365 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1366
1367 len += snprintf(msg + len, sizeof(msg) - len,
1368 "index %.*s..%.*s",
1369 abbrev, sha1_to_hex(one->sha1),
1370 abbrev, sha1_to_hex(two->sha1));
1371 if (one->mode == two->mode)
1372 len += snprintf(msg + len, sizeof(msg) - len,
1373 " %06o", one->mode);
1374 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1375 }
1376
1377 if (len)
1378 msg[--len] = 0;
1379 xfrm_msg = len ? msg : NULL;
1380
1381 if (!pgm &&
1382 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1383 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1384 /* a filepair that changes between file and symlink
1385 * needs to be split into deletion and creation.
1386 */
1387 struct diff_filespec *null = alloc_filespec(two->path);
1388 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1389 free(null);
1390 null = alloc_filespec(one->path);
1391 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1392 free(null);
1393 }
1394 else
1395 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1396 complete_rewrite);
1397
1398 free(name_munged);
1399 free(other_munged);
1400 }
1401
1402 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1403 struct diffstat_t *diffstat)
1404 {
1405 const char *name;
1406 const char *other;
1407 int complete_rewrite = 0;
1408
1409 if (DIFF_PAIR_UNMERGED(p)) {
1410 /* unmerged */
1411 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1412 return;
1413 }
1414
1415 name = p->one->path;
1416 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1417
1418 diff_fill_sha1_info(p->one);
1419 diff_fill_sha1_info(p->two);
1420
1421 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1422 complete_rewrite = 1;
1423 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
1424 }
1425
1426 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1427 {
1428 const char *name;
1429 const char *other;
1430
1431 if (DIFF_PAIR_UNMERGED(p)) {
1432 /* unmerged */
1433 return;
1434 }
1435
1436 name = p->one->path;
1437 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1438
1439 diff_fill_sha1_info(p->one);
1440 diff_fill_sha1_info(p->two);
1441
1442 builtin_checkdiff(name, other, p->one, p->two);
1443 }
1444
1445 void diff_setup(struct diff_options *options)
1446 {
1447 memset(options, 0, sizeof(*options));
1448 options->line_termination = '\n';
1449 options->break_opt = -1;
1450 options->rename_limit = -1;
1451 options->context = 3;
1452 options->msg_sep = "";
1453
1454 options->change = diff_change;
1455 options->add_remove = diff_addremove;
1456 options->color_diff = diff_use_color_default;
1457 options->detect_rename = diff_detect_rename_default;
1458 }
1459
1460 int diff_setup_done(struct diff_options *options)
1461 {
1462 if ((options->find_copies_harder &&
1463 options->detect_rename != DIFF_DETECT_COPY) ||
1464 (0 <= options->rename_limit && !options->detect_rename))
1465 return -1;
1466
1467 if (options->output_format & (DIFF_FORMAT_NAME |
1468 DIFF_FORMAT_NAME_STATUS |
1469 DIFF_FORMAT_CHECKDIFF |
1470 DIFF_FORMAT_NO_OUTPUT))
1471 options->output_format &= ~(DIFF_FORMAT_RAW |
1472 DIFF_FORMAT_DIFFSTAT |
1473 DIFF_FORMAT_SUMMARY |
1474 DIFF_FORMAT_PATCH);
1475
1476 /*
1477 * These cases always need recursive; we do not drop caller-supplied
1478 * recursive bits for other formats here.
1479 */
1480 if (options->output_format & (DIFF_FORMAT_PATCH |
1481 DIFF_FORMAT_DIFFSTAT |
1482 DIFF_FORMAT_CHECKDIFF))
1483 options->recursive = 1;
1484 /*
1485 * Also pickaxe would not work very well if you do not say recursive
1486 */
1487 if (options->pickaxe)
1488 options->recursive = 1;
1489
1490 if (options->detect_rename && options->rename_limit < 0)
1491 options->rename_limit = diff_rename_limit_default;
1492 if (options->setup & DIFF_SETUP_USE_CACHE) {
1493 if (!active_cache)
1494 /* read-cache does not die even when it fails
1495 * so it is safe for us to do this here. Also
1496 * it does not smudge active_cache or active_nr
1497 * when it fails, so we do not have to worry about
1498 * cleaning it up ourselves either.
1499 */
1500 read_cache();
1501 }
1502 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
1503 use_size_cache = 1;
1504 if (options->abbrev <= 0 || 40 < options->abbrev)
1505 options->abbrev = 40; /* full */
1506
1507 return 0;
1508 }
1509
1510 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
1511 {
1512 char c, *eq;
1513 int len;
1514
1515 if (*arg != '-')
1516 return 0;
1517 c = *++arg;
1518 if (!c)
1519 return 0;
1520 if (c == arg_short) {
1521 c = *++arg;
1522 if (!c)
1523 return 1;
1524 if (val && isdigit(c)) {
1525 char *end;
1526 int n = strtoul(arg, &end, 10);
1527 if (*end)
1528 return 0;
1529 *val = n;
1530 return 1;
1531 }
1532 return 0;
1533 }
1534 if (c != '-')
1535 return 0;
1536 arg++;
1537 eq = strchr(arg, '=');
1538 if (eq)
1539 len = eq - arg;
1540 else
1541 len = strlen(arg);
1542 if (!len || strncmp(arg, arg_long, len))
1543 return 0;
1544 if (eq) {
1545 int n;
1546 char *end;
1547 if (!isdigit(*++eq))
1548 return 0;
1549 n = strtoul(eq, &end, 10);
1550 if (*end)
1551 return 0;
1552 *val = n;
1553 }
1554 return 1;
1555 }
1556
1557 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
1558 {
1559 const char *arg = av[0];
1560 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
1561 options->output_format |= DIFF_FORMAT_PATCH;
1562 else if (opt_arg(arg, 'U', "unified", &options->context))
1563 options->output_format |= DIFF_FORMAT_PATCH;
1564 else if (!strcmp(arg, "--raw"))
1565 options->output_format |= DIFF_FORMAT_RAW;
1566 else if (!strcmp(arg, "--patch-with-raw")) {
1567 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
1568 }
1569 else if (!strcmp(arg, "--stat"))
1570 options->output_format |= DIFF_FORMAT_DIFFSTAT;
1571 else if (!strcmp(arg, "--check"))
1572 options->output_format |= DIFF_FORMAT_CHECKDIFF;
1573 else if (!strcmp(arg, "--summary"))
1574 options->output_format |= DIFF_FORMAT_SUMMARY;
1575 else if (!strcmp(arg, "--patch-with-stat")) {
1576 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
1577 }
1578 else if (!strcmp(arg, "-z"))
1579 options->line_termination = 0;
1580 else if (!strncmp(arg, "-l", 2))
1581 options->rename_limit = strtoul(arg+2, NULL, 10);
1582 else if (!strcmp(arg, "--full-index"))
1583 options->full_index = 1;
1584 else if (!strcmp(arg, "--binary")) {
1585 options->output_format |= DIFF_FORMAT_PATCH;
1586 options->full_index = options->binary = 1;
1587 }
1588 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
1589 options->text = 1;
1590 }
1591 else if (!strcmp(arg, "--name-only"))
1592 options->output_format |= DIFF_FORMAT_NAME;
1593 else if (!strcmp(arg, "--name-status"))
1594 options->output_format |= DIFF_FORMAT_NAME_STATUS;
1595 else if (!strcmp(arg, "-R"))
1596 options->reverse_diff = 1;
1597 else if (!strncmp(arg, "-S", 2))
1598 options->pickaxe = arg + 2;
1599 else if (!strcmp(arg, "-s")) {
1600 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
1601 }
1602 else if (!strncmp(arg, "-O", 2))
1603 options->orderfile = arg + 2;
1604 else if (!strncmp(arg, "--diff-filter=", 14))
1605 options->filter = arg + 14;
1606 else if (!strcmp(arg, "--pickaxe-all"))
1607 options->pickaxe_opts = DIFF_PICKAXE_ALL;
1608 else if (!strcmp(arg, "--pickaxe-regex"))
1609 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
1610 else if (!strncmp(arg, "-B", 2)) {
1611 if ((options->break_opt =
1612 diff_scoreopt_parse(arg)) == -1)
1613 return -1;
1614 }
1615 else if (!strncmp(arg, "-M", 2)) {
1616 if ((options->rename_score =
1617 diff_scoreopt_parse(arg)) == -1)
1618 return -1;
1619 options->detect_rename = DIFF_DETECT_RENAME;
1620 }
1621 else if (!strncmp(arg, "-C", 2)) {
1622 if ((options->rename_score =
1623 diff_scoreopt_parse(arg)) == -1)
1624 return -1;
1625 options->detect_rename = DIFF_DETECT_COPY;
1626 }
1627 else if (!strcmp(arg, "--find-copies-harder"))
1628 options->find_copies_harder = 1;
1629 else if (!strcmp(arg, "--abbrev"))
1630 options->abbrev = DEFAULT_ABBREV;
1631 else if (!strncmp(arg, "--abbrev=", 9)) {
1632 options->abbrev = strtoul(arg + 9, NULL, 10);
1633 if (options->abbrev < MINIMUM_ABBREV)
1634 options->abbrev = MINIMUM_ABBREV;
1635 else if (40 < options->abbrev)
1636 options->abbrev = 40;
1637 }
1638 else if (!strcmp(arg, "--color"))
1639 options->color_diff = 1;
1640 else if (!strcmp(arg, "--no-color"))
1641 options->color_diff = 0;
1642 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
1643 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
1644 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
1645 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
1646 else if (!strcmp(arg, "--no-renames"))
1647 options->detect_rename = 0;
1648 else
1649 return 0;
1650 return 1;
1651 }
1652
1653 static int parse_num(const char **cp_p)
1654 {
1655 unsigned long num, scale;
1656 int ch, dot;
1657 const char *cp = *cp_p;
1658
1659 num = 0;
1660 scale = 1;
1661 dot = 0;
1662 for(;;) {
1663 ch = *cp;
1664 if ( !dot && ch == '.' ) {
1665 scale = 1;
1666 dot = 1;
1667 } else if ( ch == '%' ) {
1668 scale = dot ? scale*100 : 100;
1669 cp++; /* % is always at the end */
1670 break;
1671 } else if ( ch >= '0' && ch <= '9' ) {
1672 if ( scale < 100000 ) {
1673 scale *= 10;
1674 num = (num*10) + (ch-'0');
1675 }
1676 } else {
1677 break;
1678 }
1679 cp++;
1680 }
1681 *cp_p = cp;
1682
1683 /* user says num divided by scale and we say internally that
1684 * is MAX_SCORE * num / scale.
1685 */
1686 return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
1687 }
1688
1689 int diff_scoreopt_parse(const char *opt)
1690 {
1691 int opt1, opt2, cmd;
1692
1693 if (*opt++ != '-')
1694 return -1;
1695 cmd = *opt++;
1696 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
1697 return -1; /* that is not a -M, -C nor -B option */
1698
1699 opt1 = parse_num(&opt);
1700 if (cmd != 'B')
1701 opt2 = 0;
1702 else {
1703 if (*opt == 0)
1704 opt2 = 0;
1705 else if (*opt != '/')
1706 return -1; /* we expect -B80/99 or -B80 */
1707 else {
1708 opt++;
1709 opt2 = parse_num(&opt);
1710 }
1711 }
1712 if (*opt != 0)
1713 return -1;
1714 return opt1 | (opt2 << 16);
1715 }
1716
1717 struct diff_queue_struct diff_queued_diff;
1718
1719 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
1720 {
1721 if (queue->alloc <= queue->nr) {
1722 queue->alloc = alloc_nr(queue->alloc);
1723 queue->queue = xrealloc(queue->queue,
1724 sizeof(dp) * queue->alloc);
1725 }
1726 queue->queue[queue->nr++] = dp;
1727 }
1728
1729 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
1730 struct diff_filespec *one,
1731 struct diff_filespec *two)
1732 {
1733 struct diff_filepair *dp = xmalloc(sizeof(*dp));
1734 dp->one = one;
1735 dp->two = two;
1736 dp->score = 0;
1737 dp->status = 0;
1738 dp->source_stays = 0;
1739 dp->broken_pair = 0;
1740 if (queue)
1741 diff_q(queue, dp);
1742 return dp;
1743 }
1744
1745 void diff_free_filepair(struct diff_filepair *p)
1746 {
1747 diff_free_filespec_data(p->one);
1748 diff_free_filespec_data(p->two);
1749 free(p->one);
1750 free(p->two);
1751 free(p);
1752 }
1753
1754 /* This is different from find_unique_abbrev() in that
1755 * it stuffs the result with dots for alignment.
1756 */
1757 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
1758 {
1759 int abblen;
1760 const char *abbrev;
1761 if (len == 40)
1762 return sha1_to_hex(sha1);
1763
1764 abbrev = find_unique_abbrev(sha1, len);
1765 if (!abbrev)
1766 return sha1_to_hex(sha1);
1767 abblen = strlen(abbrev);
1768 if (abblen < 37) {
1769 static char hex[41];
1770 if (len < abblen && abblen <= len + 2)
1771 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
1772 else
1773 sprintf(hex, "%s...", abbrev);
1774 return hex;
1775 }
1776 return sha1_to_hex(sha1);
1777 }
1778
1779 static void diff_flush_raw(struct diff_filepair *p,
1780 struct diff_options *options)
1781 {
1782 int two_paths;
1783 char status[10];
1784 int abbrev = options->abbrev;
1785 const char *path_one, *path_two;
1786 int inter_name_termination = '\t';
1787 int line_termination = options->line_termination;
1788
1789 if (!line_termination)
1790 inter_name_termination = 0;
1791
1792 path_one = p->one->path;
1793 path_two = p->two->path;
1794 if (line_termination) {
1795 path_one = quote_one(path_one);
1796 path_two = quote_one(path_two);
1797 }
1798
1799 if (p->score)
1800 sprintf(status, "%c%03d", p->status,
1801 (int)(0.5 + p->score * 100.0/MAX_SCORE));
1802 else {
1803 status[0] = p->status;
1804 status[1] = 0;
1805 }
1806 switch (p->status) {
1807 case DIFF_STATUS_COPIED:
1808 case DIFF_STATUS_RENAMED:
1809 two_paths = 1;
1810 break;
1811 case DIFF_STATUS_ADDED:
1812 case DIFF_STATUS_DELETED:
1813 two_paths = 0;
1814 break;
1815 default:
1816 two_paths = 0;
1817 break;
1818 }
1819 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
1820 printf(":%06o %06o %s ",
1821 p->one->mode, p->two->mode,
1822 diff_unique_abbrev(p->one->sha1, abbrev));
1823 printf("%s ",
1824 diff_unique_abbrev(p->two->sha1, abbrev));
1825 }
1826 printf("%s%c%s", status, inter_name_termination, path_one);
1827 if (two_paths)
1828 printf("%c%s", inter_name_termination, path_two);
1829 putchar(line_termination);
1830 if (path_one != p->one->path)
1831 free((void*)path_one);
1832 if (path_two != p->two->path)
1833 free((void*)path_two);
1834 }
1835
1836 static void diff_flush_name(struct diff_filepair *p, int line_termination)
1837 {
1838 char *path = p->two->path;
1839
1840 if (line_termination)
1841 path = quote_one(p->two->path);
1842 printf("%s%c", path, line_termination);
1843 if (p->two->path != path)
1844 free(path);
1845 }
1846
1847 int diff_unmodified_pair(struct diff_filepair *p)
1848 {
1849 /* This function is written stricter than necessary to support
1850 * the currently implemented transformers, but the idea is to
1851 * let transformers to produce diff_filepairs any way they want,
1852 * and filter and clean them up here before producing the output.
1853 */
1854 struct diff_filespec *one, *two;
1855
1856 if (DIFF_PAIR_UNMERGED(p))
1857 return 0; /* unmerged is interesting */
1858
1859 one = p->one;
1860 two = p->two;
1861
1862 /* deletion, addition, mode or type change
1863 * and rename are all interesting.
1864 */
1865 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
1866 DIFF_PAIR_MODE_CHANGED(p) ||
1867 strcmp(one->path, two->path))
1868 return 0;
1869
1870 /* both are valid and point at the same path. that is, we are
1871 * dealing with a change.
1872 */
1873 if (one->sha1_valid && two->sha1_valid &&
1874 !memcmp(one->sha1, two->sha1, sizeof(one->sha1)))
1875 return 1; /* no change */
1876 if (!one->sha1_valid && !two->sha1_valid)
1877 return 1; /* both look at the same file on the filesystem. */
1878 return 0;
1879 }
1880
1881 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
1882 {
1883 if (diff_unmodified_pair(p))
1884 return;
1885
1886 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1887 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1888 return; /* no tree diffs in patch format */
1889
1890 run_diff(p, o);
1891 }
1892
1893 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
1894 struct diffstat_t *diffstat)
1895 {
1896 if (diff_unmodified_pair(p))
1897 return;
1898
1899 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1900 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1901 return; /* no tree diffs in patch format */
1902
1903 run_diffstat(p, o, diffstat);
1904 }
1905
1906 static void diff_flush_checkdiff(struct diff_filepair *p,
1907 struct diff_options *o)
1908 {
1909 if (diff_unmodified_pair(p))
1910 return;
1911
1912 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1913 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1914 return; /* no tree diffs in patch format */
1915
1916 run_checkdiff(p, o);
1917 }
1918
1919 int diff_queue_is_empty(void)
1920 {
1921 struct diff_queue_struct *q = &diff_queued_diff;
1922 int i;
1923 for (i = 0; i < q->nr; i++)
1924 if (!diff_unmodified_pair(q->queue[i]))
1925 return 0;
1926 return 1;
1927 }
1928
1929 #if DIFF_DEBUG
1930 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
1931 {
1932 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
1933 x, one ? one : "",
1934 s->path,
1935 DIFF_FILE_VALID(s) ? "valid" : "invalid",
1936 s->mode,
1937 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
1938 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
1939 x, one ? one : "",
1940 s->size, s->xfrm_flags);
1941 }
1942
1943 void diff_debug_filepair(const struct diff_filepair *p, int i)
1944 {
1945 diff_debug_filespec(p->one, i, "one");
1946 diff_debug_filespec(p->two, i, "two");
1947 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
1948 p->score, p->status ? p->status : '?',
1949 p->source_stays, p->broken_pair);
1950 }
1951
1952 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
1953 {
1954 int i;
1955 if (msg)
1956 fprintf(stderr, "%s\n", msg);
1957 fprintf(stderr, "q->nr = %d\n", q->nr);
1958 for (i = 0; i < q->nr; i++) {
1959 struct diff_filepair *p = q->queue[i];
1960 diff_debug_filepair(p, i);
1961 }
1962 }
1963 #endif
1964
1965 static void diff_resolve_rename_copy(void)
1966 {
1967 int i, j;
1968 struct diff_filepair *p, *pp;
1969 struct diff_queue_struct *q = &diff_queued_diff;
1970
1971 diff_debug_queue("resolve-rename-copy", q);
1972
1973 for (i = 0; i < q->nr; i++) {
1974 p = q->queue[i];
1975 p->status = 0; /* undecided */
1976 if (DIFF_PAIR_UNMERGED(p))
1977 p->status = DIFF_STATUS_UNMERGED;
1978 else if (!DIFF_FILE_VALID(p->one))
1979 p->status = DIFF_STATUS_ADDED;
1980 else if (!DIFF_FILE_VALID(p->two))
1981 p->status = DIFF_STATUS_DELETED;
1982 else if (DIFF_PAIR_TYPE_CHANGED(p))
1983 p->status = DIFF_STATUS_TYPE_CHANGED;
1984
1985 /* from this point on, we are dealing with a pair
1986 * whose both sides are valid and of the same type, i.e.
1987 * either in-place edit or rename/copy edit.
1988 */
1989 else if (DIFF_PAIR_RENAME(p)) {
1990 if (p->source_stays) {
1991 p->status = DIFF_STATUS_COPIED;
1992 continue;
1993 }
1994 /* See if there is some other filepair that
1995 * copies from the same source as us. If so
1996 * we are a copy. Otherwise we are either a
1997 * copy if the path stays, or a rename if it
1998 * does not, but we already handled "stays" case.
1999 */
2000 for (j = i + 1; j < q->nr; j++) {
2001 pp = q->queue[j];
2002 if (strcmp(pp->one->path, p->one->path))
2003 continue; /* not us */
2004 if (!DIFF_PAIR_RENAME(pp))
2005 continue; /* not a rename/copy */
2006 /* pp is a rename/copy from the same source */
2007 p->status = DIFF_STATUS_COPIED;
2008 break;
2009 }
2010 if (!p->status)
2011 p->status = DIFF_STATUS_RENAMED;
2012 }
2013 else if (memcmp(p->one->sha1, p->two->sha1, 20) ||
2014 p->one->mode != p->two->mode)
2015 p->status = DIFF_STATUS_MODIFIED;
2016 else {
2017 /* This is a "no-change" entry and should not
2018 * happen anymore, but prepare for broken callers.
2019 */
2020 error("feeding unmodified %s to diffcore",
2021 p->one->path);
2022 p->status = DIFF_STATUS_UNKNOWN;
2023 }
2024 }
2025 diff_debug_queue("resolve-rename-copy done", q);
2026 }
2027
2028 static int check_pair_status(struct diff_filepair *p)
2029 {
2030 switch (p->status) {
2031 case DIFF_STATUS_UNKNOWN:
2032 return 0;
2033 case 0:
2034 die("internal error in diff-resolve-rename-copy");
2035 default:
2036 return 1;
2037 }
2038 }
2039
2040 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2041 {
2042 int fmt = opt->output_format;
2043
2044 if (fmt & DIFF_FORMAT_CHECKDIFF)
2045 diff_flush_checkdiff(p, opt);
2046 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2047 diff_flush_raw(p, opt);
2048 else if (fmt & DIFF_FORMAT_NAME)
2049 diff_flush_name(p, opt->line_termination);
2050 }
2051
2052 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2053 {
2054 if (fs->mode)
2055 printf(" %s mode %06o %s\n", newdelete, fs->mode, fs->path);
2056 else
2057 printf(" %s %s\n", newdelete, fs->path);
2058 }
2059
2060
2061 static void show_mode_change(struct diff_filepair *p, int show_name)
2062 {
2063 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2064 if (show_name)
2065 printf(" mode change %06o => %06o %s\n",
2066 p->one->mode, p->two->mode, p->two->path);
2067 else
2068 printf(" mode change %06o => %06o\n",
2069 p->one->mode, p->two->mode);
2070 }
2071 }
2072
2073 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2074 {
2075 const char *old, *new;
2076
2077 /* Find common prefix */
2078 old = p->one->path;
2079 new = p->two->path;
2080 while (1) {
2081 const char *slash_old, *slash_new;
2082 slash_old = strchr(old, '/');
2083 slash_new = strchr(new, '/');
2084 if (!slash_old ||
2085 !slash_new ||
2086 slash_old - old != slash_new - new ||
2087 memcmp(old, new, slash_new - new))
2088 break;
2089 old = slash_old + 1;
2090 new = slash_new + 1;
2091 }
2092 /* p->one->path thru old is the common prefix, and old and new
2093 * through the end of names are renames
2094 */
2095 if (old != p->one->path)
2096 printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
2097 (int)(old - p->one->path), p->one->path,
2098 old, new, (int)(0.5 + p->score * 100.0/MAX_SCORE));
2099 else
2100 printf(" %s %s => %s (%d%%)\n", renamecopy,
2101 p->one->path, p->two->path,
2102 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2103 show_mode_change(p, 0);
2104 }
2105
2106 static void diff_summary(struct diff_filepair *p)
2107 {
2108 switch(p->status) {
2109 case DIFF_STATUS_DELETED:
2110 show_file_mode_name("delete", p->one);
2111 break;
2112 case DIFF_STATUS_ADDED:
2113 show_file_mode_name("create", p->two);
2114 break;
2115 case DIFF_STATUS_COPIED:
2116 show_rename_copy("copy", p);
2117 break;
2118 case DIFF_STATUS_RENAMED:
2119 show_rename_copy("rename", p);
2120 break;
2121 default:
2122 if (p->score) {
2123 printf(" rewrite %s (%d%%)\n", p->two->path,
2124 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2125 show_mode_change(p, 0);
2126 } else show_mode_change(p, 1);
2127 break;
2128 }
2129 }
2130
2131 struct patch_id_t {
2132 struct xdiff_emit_state xm;
2133 SHA_CTX *ctx;
2134 int patchlen;
2135 };
2136
2137 static int remove_space(char *line, int len)
2138 {
2139 int i;
2140 char *dst = line;
2141 unsigned char c;
2142
2143 for (i = 0; i < len; i++)
2144 if (!isspace((c = line[i])))
2145 *dst++ = c;
2146
2147 return dst - line;
2148 }
2149
2150 static void patch_id_consume(void *priv, char *line, unsigned long len)
2151 {
2152 struct patch_id_t *data = priv;
2153 int new_len;
2154
2155 /* Ignore line numbers when computing the SHA1 of the patch */
2156 if (!strncmp(line, "@@ -", 4))
2157 return;
2158
2159 new_len = remove_space(line, len);
2160
2161 SHA1_Update(data->ctx, line, new_len);
2162 data->patchlen += new_len;
2163 }
2164
2165 /* returns 0 upon success, and writes result into sha1 */
2166 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2167 {
2168 struct diff_queue_struct *q = &diff_queued_diff;
2169 int i;
2170 SHA_CTX ctx;
2171 struct patch_id_t data;
2172 char buffer[PATH_MAX * 4 + 20];
2173
2174 SHA1_Init(&ctx);
2175 memset(&data, 0, sizeof(struct patch_id_t));
2176 data.ctx = &ctx;
2177 data.xm.consume = patch_id_consume;
2178
2179 for (i = 0; i < q->nr; i++) {
2180 xpparam_t xpp;
2181 xdemitconf_t xecfg;
2182 xdemitcb_t ecb;
2183 mmfile_t mf1, mf2;
2184 struct diff_filepair *p = q->queue[i];
2185 int len1, len2;
2186
2187 if (p->status == 0)
2188 return error("internal diff status error");
2189 if (p->status == DIFF_STATUS_UNKNOWN)
2190 continue;
2191 if (diff_unmodified_pair(p))
2192 continue;
2193 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2194 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2195 continue;
2196 if (DIFF_PAIR_UNMERGED(p))
2197 continue;
2198
2199 diff_fill_sha1_info(p->one);
2200 diff_fill_sha1_info(p->two);
2201 if (fill_mmfile(&mf1, p->one) < 0 ||
2202 fill_mmfile(&mf2, p->two) < 0)
2203 return error("unable to read files to diff");
2204
2205 /* Maybe hash p->two? into the patch id? */
2206 if (mmfile_is_binary(&mf2))
2207 continue;
2208
2209 len1 = remove_space(p->one->path, strlen(p->one->path));
2210 len2 = remove_space(p->two->path, strlen(p->two->path));
2211 if (p->one->mode == 0)
2212 len1 = snprintf(buffer, sizeof(buffer),
2213 "diff--gita/%.*sb/%.*s"
2214 "newfilemode%06o"
2215 "---/dev/null"
2216 "+++b/%.*s",
2217 len1, p->one->path,
2218 len2, p->two->path,
2219 p->two->mode,
2220 len2, p->two->path);
2221 else if (p->two->mode == 0)
2222 len1 = snprintf(buffer, sizeof(buffer),
2223 "diff--gita/%.*sb/%.*s"
2224 "deletedfilemode%06o"
2225 "---a/%.*s"
2226 "+++/dev/null",
2227 len1, p->one->path,
2228 len2, p->two->path,
2229 p->one->mode,
2230 len1, p->one->path);
2231 else
2232 len1 = snprintf(buffer, sizeof(buffer),
2233 "diff--gita/%.*sb/%.*s"
2234 "---a/%.*s"
2235 "+++b/%.*s",
2236 len1, p->one->path,
2237 len2, p->two->path,
2238 len1, p->one->path,
2239 len2, p->two->path);
2240 SHA1_Update(&ctx, buffer, len1);
2241
2242 xpp.flags = XDF_NEED_MINIMAL;
2243 xecfg.ctxlen = 3;
2244 xecfg.flags = XDL_EMIT_FUNCNAMES;
2245 ecb.outf = xdiff_outf;
2246 ecb.priv = &data;
2247 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2248 }
2249
2250 SHA1_Final(sha1, &ctx);
2251 return 0;
2252 }
2253
2254 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2255 {
2256 struct diff_queue_struct *q = &diff_queued_diff;
2257 int i;
2258 int result = diff_get_patch_id(options, sha1);
2259
2260 for (i = 0; i < q->nr; i++)
2261 diff_free_filepair(q->queue[i]);
2262
2263 free(q->queue);
2264 q->queue = NULL;
2265 q->nr = q->alloc = 0;
2266
2267 return result;
2268 }
2269
2270 static int is_summary_empty(const struct diff_queue_struct *q)
2271 {
2272 int i;
2273
2274 for (i = 0; i < q->nr; i++) {
2275 const struct diff_filepair *p = q->queue[i];
2276
2277 switch (p->status) {
2278 case DIFF_STATUS_DELETED:
2279 case DIFF_STATUS_ADDED:
2280 case DIFF_STATUS_COPIED:
2281 case DIFF_STATUS_RENAMED:
2282 return 0;
2283 default:
2284 if (p->score)
2285 return 0;
2286 if (p->one->mode && p->two->mode &&
2287 p->one->mode != p->two->mode)
2288 return 0;
2289 break;
2290 }
2291 }
2292 return 1;
2293 }
2294
2295 void diff_flush(struct diff_options *options)
2296 {
2297 struct diff_queue_struct *q = &diff_queued_diff;
2298 int i, output_format = options->output_format;
2299 int separator = 0;
2300
2301 /*
2302 * Order: raw, stat, summary, patch
2303 * or: name/name-status/checkdiff (other bits clear)
2304 */
2305 if (!q->nr)
2306 goto free_queue;
2307
2308 if (output_format & (DIFF_FORMAT_RAW |
2309 DIFF_FORMAT_NAME |
2310 DIFF_FORMAT_NAME_STATUS |
2311 DIFF_FORMAT_CHECKDIFF)) {
2312 for (i = 0; i < q->nr; i++) {
2313 struct diff_filepair *p = q->queue[i];
2314 if (check_pair_status(p))
2315 flush_one_pair(p, options);
2316 }
2317 separator++;
2318 }
2319
2320 if (output_format & DIFF_FORMAT_DIFFSTAT) {
2321 struct diffstat_t diffstat;
2322
2323 memset(&diffstat, 0, sizeof(struct diffstat_t));
2324 diffstat.xm.consume = diffstat_consume;
2325 for (i = 0; i < q->nr; i++) {
2326 struct diff_filepair *p = q->queue[i];
2327 if (check_pair_status(p))
2328 diff_flush_stat(p, options, &diffstat);
2329 }
2330 show_stats(&diffstat);
2331 separator++;
2332 }
2333
2334 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2335 for (i = 0; i < q->nr; i++)
2336 diff_summary(q->queue[i]);
2337 separator++;
2338 }
2339
2340 if (output_format & DIFF_FORMAT_PATCH) {
2341 if (separator) {
2342 if (options->stat_sep) {
2343 /* attach patch instead of inline */
2344 fputs(options->stat_sep, stdout);
2345 } else {
2346 putchar(options->line_termination);
2347 }
2348 }
2349
2350 for (i = 0; i < q->nr; i++) {
2351 struct diff_filepair *p = q->queue[i];
2352 if (check_pair_status(p))
2353 diff_flush_patch(p, options);
2354 }
2355 }
2356
2357 for (i = 0; i < q->nr; i++)
2358 diff_free_filepair(q->queue[i]);
2359 free_queue:
2360 free(q->queue);
2361 q->queue = NULL;
2362 q->nr = q->alloc = 0;
2363 }
2364
2365 static void diffcore_apply_filter(const char *filter)
2366 {
2367 int i;
2368 struct diff_queue_struct *q = &diff_queued_diff;
2369 struct diff_queue_struct outq;
2370 outq.queue = NULL;
2371 outq.nr = outq.alloc = 0;
2372
2373 if (!filter)
2374 return;
2375
2376 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2377 int found;
2378 for (i = found = 0; !found && i < q->nr; i++) {
2379 struct diff_filepair *p = q->queue[i];
2380 if (((p->status == DIFF_STATUS_MODIFIED) &&
2381 ((p->score &&
2382 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2383 (!p->score &&
2384 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2385 ((p->status != DIFF_STATUS_MODIFIED) &&
2386 strchr(filter, p->status)))
2387 found++;
2388 }
2389 if (found)
2390 return;
2391
2392 /* otherwise we will clear the whole queue
2393 * by copying the empty outq at the end of this
2394 * function, but first clear the current entries
2395 * in the queue.
2396 */
2397 for (i = 0; i < q->nr; i++)
2398 diff_free_filepair(q->queue[i]);
2399 }
2400 else {
2401 /* Only the matching ones */
2402 for (i = 0; i < q->nr; i++) {
2403 struct diff_filepair *p = q->queue[i];
2404
2405 if (((p->status == DIFF_STATUS_MODIFIED) &&
2406 ((p->score &&
2407 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2408 (!p->score &&
2409 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2410 ((p->status != DIFF_STATUS_MODIFIED) &&
2411 strchr(filter, p->status)))
2412 diff_q(&outq, p);
2413 else
2414 diff_free_filepair(p);
2415 }
2416 }
2417 free(q->queue);
2418 *q = outq;
2419 }
2420
2421 void diffcore_std(struct diff_options *options)
2422 {
2423 if (options->break_opt != -1)
2424 diffcore_break(options->break_opt);
2425 if (options->detect_rename)
2426 diffcore_rename(options);
2427 if (options->break_opt != -1)
2428 diffcore_merge_broken();
2429 if (options->pickaxe)
2430 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2431 if (options->orderfile)
2432 diffcore_order(options->orderfile);
2433 diff_resolve_rename_copy();
2434 diffcore_apply_filter(options->filter);
2435 }
2436
2437
2438 void diffcore_std_no_resolve(struct diff_options *options)
2439 {
2440 if (options->pickaxe)
2441 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2442 if (options->orderfile)
2443 diffcore_order(options->orderfile);
2444 diffcore_apply_filter(options->filter);
2445 }
2446
2447 void diff_addremove(struct diff_options *options,
2448 int addremove, unsigned mode,
2449 const unsigned char *sha1,
2450 const char *base, const char *path)
2451 {
2452 char concatpath[PATH_MAX];
2453 struct diff_filespec *one, *two;
2454
2455 /* This may look odd, but it is a preparation for
2456 * feeding "there are unchanged files which should
2457 * not produce diffs, but when you are doing copy
2458 * detection you would need them, so here they are"
2459 * entries to the diff-core. They will be prefixed
2460 * with something like '=' or '*' (I haven't decided
2461 * which but should not make any difference).
2462 * Feeding the same new and old to diff_change()
2463 * also has the same effect.
2464 * Before the final output happens, they are pruned after
2465 * merged into rename/copy pairs as appropriate.
2466 */
2467 if (options->reverse_diff)
2468 addremove = (addremove == '+' ? '-' :
2469 addremove == '-' ? '+' : addremove);
2470
2471 if (!path) path = "";
2472 sprintf(concatpath, "%s%s", base, path);
2473 one = alloc_filespec(concatpath);
2474 two = alloc_filespec(concatpath);
2475
2476 if (addremove != '+')
2477 fill_filespec(one, sha1, mode);
2478 if (addremove != '-')
2479 fill_filespec(two, sha1, mode);
2480
2481 diff_queue(&diff_queued_diff, one, two);
2482 }
2483
2484 void diff_change(struct diff_options *options,
2485 unsigned old_mode, unsigned new_mode,
2486 const unsigned char *old_sha1,
2487 const unsigned char *new_sha1,
2488 const char *base, const char *path)
2489 {
2490 char concatpath[PATH_MAX];
2491 struct diff_filespec *one, *two;
2492
2493 if (options->reverse_diff) {
2494 unsigned tmp;
2495 const unsigned char *tmp_c;
2496 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
2497 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
2498 }
2499 if (!path) path = "";
2500 sprintf(concatpath, "%s%s", base, path);
2501 one = alloc_filespec(concatpath);
2502 two = alloc_filespec(concatpath);
2503 fill_filespec(one, old_sha1, old_mode);
2504 fill_filespec(two, new_sha1, new_mode);
2505
2506 diff_queue(&diff_queued_diff, one, two);
2507 }
2508
2509 void diff_unmerge(struct diff_options *options,
2510 const char *path)
2511 {
2512 struct diff_filespec *one, *two;
2513 one = alloc_filespec(path);
2514 two = alloc_filespec(path);
2515 diff_queue(&diff_queued_diff, one, two);
2516 }