443e24861ba1857822dbe8e3c831f8037e4e832e
[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 #include "color.h"
14
15 static int use_size_cache;
16
17 static int diff_detect_rename_default;
18 static int diff_rename_limit_default = -1;
19 static int diff_use_color_default;
20
21 static char diff_colors[][COLOR_MAXLEN] = {
22 "\033[m", /* reset */
23 "", /* normal */
24 "\033[1m", /* bold */
25 "\033[36m", /* cyan */
26 "\033[31m", /* red */
27 "\033[32m", /* green */
28 "\033[33m" /* yellow */
29 };
30
31 static int parse_diff_color_slot(const char *var, int ofs)
32 {
33 if (!strcasecmp(var+ofs, "plain"))
34 return DIFF_PLAIN;
35 if (!strcasecmp(var+ofs, "meta"))
36 return DIFF_METAINFO;
37 if (!strcasecmp(var+ofs, "frag"))
38 return DIFF_FRAGINFO;
39 if (!strcasecmp(var+ofs, "old"))
40 return DIFF_FILE_OLD;
41 if (!strcasecmp(var+ofs, "new"))
42 return DIFF_FILE_NEW;
43 if (!strcasecmp(var+ofs, "commit"))
44 return DIFF_COMMIT;
45 die("bad config variable '%s'", var);
46 }
47
48 /*
49 * These are to give UI layer defaults.
50 * The core-level commands such as git-diff-files should
51 * never be affected by the setting of diff.renames
52 * the user happens to have in the configuration file.
53 */
54 int git_diff_ui_config(const char *var, const char *value)
55 {
56 if (!strcmp(var, "diff.renamelimit")) {
57 diff_rename_limit_default = git_config_int(var, value);
58 return 0;
59 }
60 if (!strcmp(var, "diff.color")) {
61 diff_use_color_default = git_config_colorbool(var, value);
62 return 0;
63 }
64 if (!strcmp(var, "diff.renames")) {
65 if (!value)
66 diff_detect_rename_default = DIFF_DETECT_RENAME;
67 else if (!strcasecmp(value, "copies") ||
68 !strcasecmp(value, "copy"))
69 diff_detect_rename_default = DIFF_DETECT_COPY;
70 else if (git_config_bool(var,value))
71 diff_detect_rename_default = DIFF_DETECT_RENAME;
72 return 0;
73 }
74 if (!strncmp(var, "diff.color.", 11)) {
75 int slot = parse_diff_color_slot(var, 11);
76 color_parse(value, var, diff_colors[slot]);
77 return 0;
78 }
79 return git_default_config(var, value);
80 }
81
82 static char *quote_one(const char *str)
83 {
84 int needlen;
85 char *xp;
86
87 if (!str)
88 return NULL;
89 needlen = quote_c_style(str, NULL, NULL, 0);
90 if (!needlen)
91 return xstrdup(str);
92 xp = xmalloc(needlen + 1);
93 quote_c_style(str, xp, NULL, 0);
94 return xp;
95 }
96
97 static char *quote_two(const char *one, const char *two)
98 {
99 int need_one = quote_c_style(one, NULL, NULL, 1);
100 int need_two = quote_c_style(two, NULL, NULL, 1);
101 char *xp;
102
103 if (need_one + need_two) {
104 if (!need_one) need_one = strlen(one);
105 if (!need_two) need_one = strlen(two);
106
107 xp = xmalloc(need_one + need_two + 3);
108 xp[0] = '"';
109 quote_c_style(one, xp + 1, NULL, 1);
110 quote_c_style(two, xp + need_one + 1, NULL, 1);
111 strcpy(xp + need_one + need_two + 1, "\"");
112 return xp;
113 }
114 need_one = strlen(one);
115 need_two = strlen(two);
116 xp = xmalloc(need_one + need_two + 1);
117 strcpy(xp, one);
118 strcpy(xp + need_one, two);
119 return xp;
120 }
121
122 static const char *external_diff(void)
123 {
124 static const char *external_diff_cmd = NULL;
125 static int done_preparing = 0;
126
127 if (done_preparing)
128 return external_diff_cmd;
129 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
130 done_preparing = 1;
131 return external_diff_cmd;
132 }
133
134 #define TEMPFILE_PATH_LEN 50
135
136 static struct diff_tempfile {
137 const char *name; /* filename external diff should read from */
138 char hex[41];
139 char mode[10];
140 char tmp_path[TEMPFILE_PATH_LEN];
141 } diff_temp[2];
142
143 static int count_lines(const char *data, int size)
144 {
145 int count, ch, completely_empty = 1, nl_just_seen = 0;
146 count = 0;
147 while (0 < size--) {
148 ch = *data++;
149 if (ch == '\n') {
150 count++;
151 nl_just_seen = 1;
152 completely_empty = 0;
153 }
154 else {
155 nl_just_seen = 0;
156 completely_empty = 0;
157 }
158 }
159 if (completely_empty)
160 return 0;
161 if (!nl_just_seen)
162 count++; /* no trailing newline */
163 return count;
164 }
165
166 static void print_line_count(int count)
167 {
168 switch (count) {
169 case 0:
170 printf("0,0");
171 break;
172 case 1:
173 printf("1");
174 break;
175 default:
176 printf("1,%d", count);
177 break;
178 }
179 }
180
181 static void copy_file(int prefix, const char *data, int size)
182 {
183 int ch, nl_just_seen = 1;
184 while (0 < size--) {
185 ch = *data++;
186 if (nl_just_seen)
187 putchar(prefix);
188 putchar(ch);
189 if (ch == '\n')
190 nl_just_seen = 1;
191 else
192 nl_just_seen = 0;
193 }
194 if (!nl_just_seen)
195 printf("\n\\ No newline at end of file\n");
196 }
197
198 static void emit_rewrite_diff(const char *name_a,
199 const char *name_b,
200 struct diff_filespec *one,
201 struct diff_filespec *two)
202 {
203 int lc_a, lc_b;
204 diff_populate_filespec(one, 0);
205 diff_populate_filespec(two, 0);
206 lc_a = count_lines(one->data, one->size);
207 lc_b = count_lines(two->data, two->size);
208 printf("--- %s\n+++ %s\n@@ -", name_a, name_b);
209 print_line_count(lc_a);
210 printf(" +");
211 print_line_count(lc_b);
212 printf(" @@\n");
213 if (lc_a)
214 copy_file('-', one->data, one->size);
215 if (lc_b)
216 copy_file('+', two->data, two->size);
217 }
218
219 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
220 {
221 if (!DIFF_FILE_VALID(one)) {
222 mf->ptr = (char *)""; /* does not matter */
223 mf->size = 0;
224 return 0;
225 }
226 else if (diff_populate_filespec(one, 0))
227 return -1;
228 mf->ptr = one->data;
229 mf->size = one->size;
230 return 0;
231 }
232
233 struct diff_words_buffer {
234 mmfile_t text;
235 long alloc;
236 long current; /* output pointer */
237 int suppressed_newline;
238 };
239
240 static void diff_words_append(char *line, unsigned long len,
241 struct diff_words_buffer *buffer)
242 {
243 if (buffer->text.size + len > buffer->alloc) {
244 buffer->alloc = (buffer->text.size + len) * 3 / 2;
245 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
246 }
247 line++;
248 len--;
249 memcpy(buffer->text.ptr + buffer->text.size, line, len);
250 buffer->text.size += len;
251 }
252
253 struct diff_words_data {
254 struct xdiff_emit_state xm;
255 struct diff_words_buffer minus, plus;
256 };
257
258 static void print_word(struct diff_words_buffer *buffer, int len, int color,
259 int suppress_newline)
260 {
261 const char *ptr;
262 int eol = 0;
263
264 if (len == 0)
265 return;
266
267 ptr = buffer->text.ptr + buffer->current;
268 buffer->current += len;
269
270 if (ptr[len - 1] == '\n') {
271 eol = 1;
272 len--;
273 }
274
275 fputs(diff_get_color(1, color), stdout);
276 fwrite(ptr, len, 1, stdout);
277 fputs(diff_get_color(1, DIFF_RESET), stdout);
278
279 if (eol) {
280 if (suppress_newline)
281 buffer->suppressed_newline = 1;
282 else
283 putchar('\n');
284 }
285 }
286
287 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
288 {
289 struct diff_words_data *diff_words = priv;
290
291 if (diff_words->minus.suppressed_newline) {
292 if (line[0] != '+')
293 putchar('\n');
294 diff_words->minus.suppressed_newline = 0;
295 }
296
297 len--;
298 switch (line[0]) {
299 case '-':
300 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
301 break;
302 case '+':
303 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
304 break;
305 case ' ':
306 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
307 diff_words->minus.current += len;
308 break;
309 }
310 }
311
312 /* this executes the word diff on the accumulated buffers */
313 static void diff_words_show(struct diff_words_data *diff_words)
314 {
315 xpparam_t xpp;
316 xdemitconf_t xecfg;
317 xdemitcb_t ecb;
318 mmfile_t minus, plus;
319 int i;
320
321 minus.size = diff_words->minus.text.size;
322 minus.ptr = xmalloc(minus.size);
323 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
324 for (i = 0; i < minus.size; i++)
325 if (isspace(minus.ptr[i]))
326 minus.ptr[i] = '\n';
327 diff_words->minus.current = 0;
328
329 plus.size = diff_words->plus.text.size;
330 plus.ptr = xmalloc(plus.size);
331 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
332 for (i = 0; i < plus.size; i++)
333 if (isspace(plus.ptr[i]))
334 plus.ptr[i] = '\n';
335 diff_words->plus.current = 0;
336
337 xpp.flags = XDF_NEED_MINIMAL;
338 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
339 xecfg.flags = 0;
340 ecb.outf = xdiff_outf;
341 ecb.priv = diff_words;
342 diff_words->xm.consume = fn_out_diff_words_aux;
343 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
344
345 free(minus.ptr);
346 free(plus.ptr);
347 diff_words->minus.text.size = diff_words->plus.text.size = 0;
348
349 if (diff_words->minus.suppressed_newline) {
350 putchar('\n');
351 diff_words->minus.suppressed_newline = 0;
352 }
353 }
354
355 struct emit_callback {
356 struct xdiff_emit_state xm;
357 int nparents, color_diff;
358 const char **label_path;
359 struct diff_words_data *diff_words;
360 };
361
362 static void free_diff_words_data(struct emit_callback *ecbdata)
363 {
364 if (ecbdata->diff_words) {
365 /* flush buffers */
366 if (ecbdata->diff_words->minus.text.size ||
367 ecbdata->diff_words->plus.text.size)
368 diff_words_show(ecbdata->diff_words);
369
370 if (ecbdata->diff_words->minus.text.ptr)
371 free (ecbdata->diff_words->minus.text.ptr);
372 if (ecbdata->diff_words->plus.text.ptr)
373 free (ecbdata->diff_words->plus.text.ptr);
374 free(ecbdata->diff_words);
375 ecbdata->diff_words = NULL;
376 }
377 }
378
379 const char *diff_get_color(int diff_use_color, enum color_diff ix)
380 {
381 if (diff_use_color)
382 return diff_colors[ix];
383 return "";
384 }
385
386 static void fn_out_consume(void *priv, char *line, unsigned long len)
387 {
388 int i;
389 struct emit_callback *ecbdata = priv;
390 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
391 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
392
393 if (ecbdata->label_path[0]) {
394 printf("%s--- %s%s\n", set, ecbdata->label_path[0], reset);
395 printf("%s+++ %s%s\n", set, ecbdata->label_path[1], reset);
396 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
397 }
398
399 /* This is not really necessary for now because
400 * this codepath only deals with two-way diffs.
401 */
402 for (i = 0; i < len && line[i] == '@'; i++)
403 ;
404 if (2 <= i && i < len && line[i] == ' ') {
405 ecbdata->nparents = i - 1;
406 set = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
407 }
408 else if (len < ecbdata->nparents)
409 set = reset;
410 else {
411 int nparents = ecbdata->nparents;
412 int color = DIFF_PLAIN;
413 if (ecbdata->diff_words && nparents != 1)
414 /* fall back to normal diff */
415 free_diff_words_data(ecbdata);
416 if (ecbdata->diff_words) {
417 if (line[0] == '-') {
418 diff_words_append(line, len,
419 &ecbdata->diff_words->minus);
420 return;
421 } else if (line[0] == '+') {
422 diff_words_append(line, len,
423 &ecbdata->diff_words->plus);
424 return;
425 }
426 if (ecbdata->diff_words->minus.text.size ||
427 ecbdata->diff_words->plus.text.size)
428 diff_words_show(ecbdata->diff_words);
429 line++;
430 len--;
431 } else
432 for (i = 0; i < nparents && len; i++) {
433 if (line[i] == '-')
434 color = DIFF_FILE_OLD;
435 else if (line[i] == '+')
436 color = DIFF_FILE_NEW;
437 }
438 set = diff_get_color(ecbdata->color_diff, color);
439 }
440 if (len > 0 && line[len-1] == '\n')
441 len--;
442 fputs (set, stdout);
443 fwrite (line, len, 1, stdout);
444 puts (reset);
445 }
446
447 static char *pprint_rename(const char *a, const char *b)
448 {
449 const char *old = a;
450 const char *new = b;
451 char *name = NULL;
452 int pfx_length, sfx_length;
453 int len_a = strlen(a);
454 int len_b = strlen(b);
455
456 /* Find common prefix */
457 pfx_length = 0;
458 while (*old && *new && *old == *new) {
459 if (*old == '/')
460 pfx_length = old - a + 1;
461 old++;
462 new++;
463 }
464
465 /* Find common suffix */
466 old = a + len_a;
467 new = b + len_b;
468 sfx_length = 0;
469 while (a <= old && b <= new && *old == *new) {
470 if (*old == '/')
471 sfx_length = len_a - (old - a);
472 old--;
473 new--;
474 }
475
476 /*
477 * pfx{mid-a => mid-b}sfx
478 * {pfx-a => pfx-b}sfx
479 * pfx{sfx-a => sfx-b}
480 * name-a => name-b
481 */
482 if (pfx_length + sfx_length) {
483 int a_midlen = len_a - pfx_length - sfx_length;
484 int b_midlen = len_b - pfx_length - sfx_length;
485 if (a_midlen < 0) a_midlen = 0;
486 if (b_midlen < 0) b_midlen = 0;
487
488 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
489 sprintf(name, "%.*s{%.*s => %.*s}%s",
490 pfx_length, a,
491 a_midlen, a + pfx_length,
492 b_midlen, b + pfx_length,
493 a + len_a - sfx_length);
494 }
495 else {
496 name = xmalloc(len_a + len_b + 5);
497 sprintf(name, "%s => %s", a, b);
498 }
499 return name;
500 }
501
502 struct diffstat_t {
503 struct xdiff_emit_state xm;
504
505 int nr;
506 int alloc;
507 struct diffstat_file {
508 char *name;
509 unsigned is_unmerged:1;
510 unsigned is_binary:1;
511 unsigned is_renamed:1;
512 unsigned int added, deleted;
513 } **files;
514 };
515
516 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
517 const char *name_a,
518 const char *name_b)
519 {
520 struct diffstat_file *x;
521 x = xcalloc(sizeof (*x), 1);
522 if (diffstat->nr == diffstat->alloc) {
523 diffstat->alloc = alloc_nr(diffstat->alloc);
524 diffstat->files = xrealloc(diffstat->files,
525 diffstat->alloc * sizeof(x));
526 }
527 diffstat->files[diffstat->nr++] = x;
528 if (name_b) {
529 x->name = pprint_rename(name_a, name_b);
530 x->is_renamed = 1;
531 }
532 else
533 x->name = xstrdup(name_a);
534 return x;
535 }
536
537 static void diffstat_consume(void *priv, char *line, unsigned long len)
538 {
539 struct diffstat_t *diffstat = priv;
540 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
541
542 if (line[0] == '+')
543 x->added++;
544 else if (line[0] == '-')
545 x->deleted++;
546 }
547
548 static const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
549 static const char minuses[]= "----------------------------------------------------------------------";
550 const char mime_boundary_leader[] = "------------";
551
552 static void show_stats(struct diffstat_t* data)
553 {
554 int i, len, add, del, total, adds = 0, dels = 0;
555 int max, max_change = 0, max_len = 0;
556 int total_files = data->nr;
557
558 if (data->nr == 0)
559 return;
560
561 for (i = 0; i < data->nr; i++) {
562 struct diffstat_file *file = data->files[i];
563
564 len = strlen(file->name);
565 if (max_len < len)
566 max_len = len;
567
568 if (file->is_binary || file->is_unmerged)
569 continue;
570 if (max_change < file->added + file->deleted)
571 max_change = file->added + file->deleted;
572 }
573
574 for (i = 0; i < data->nr; i++) {
575 const char *prefix = "";
576 char *name = data->files[i]->name;
577 int added = data->files[i]->added;
578 int deleted = data->files[i]->deleted;
579
580 if (0 < (len = quote_c_style(name, NULL, NULL, 0))) {
581 char *qname = xmalloc(len + 1);
582 quote_c_style(name, qname, NULL, 0);
583 free(name);
584 data->files[i]->name = name = qname;
585 }
586
587 /*
588 * "scale" the filename
589 */
590 len = strlen(name);
591 max = max_len;
592 if (max > 50)
593 max = 50;
594 if (len > max) {
595 char *slash;
596 prefix = "...";
597 max -= 3;
598 name += len - max;
599 slash = strchr(name, '/');
600 if (slash)
601 name = slash;
602 }
603 len = max;
604
605 /*
606 * scale the add/delete
607 */
608 max = max_change;
609 if (max + len > 70)
610 max = 70 - len;
611
612 if (data->files[i]->is_binary) {
613 printf(" %s%-*s | Bin\n", prefix, len, name);
614 goto free_diffstat_file;
615 }
616 else if (data->files[i]->is_unmerged) {
617 printf(" %s%-*s | Unmerged\n", prefix, len, name);
618 goto free_diffstat_file;
619 }
620 else if (!data->files[i]->is_renamed &&
621 (added + deleted == 0)) {
622 total_files--;
623 goto free_diffstat_file;
624 }
625
626 add = added;
627 del = deleted;
628 total = add + del;
629 adds += add;
630 dels += del;
631
632 if (max_change > 0) {
633 total = (total * max + max_change / 2) / max_change;
634 add = (add * max + max_change / 2) / max_change;
635 del = total - add;
636 }
637 printf(" %s%-*s |%5d %.*s%.*s\n", prefix,
638 len, name, added + deleted,
639 add, pluses, del, minuses);
640 free_diffstat_file:
641 free(data->files[i]->name);
642 free(data->files[i]);
643 }
644 free(data->files);
645 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
646 total_files, adds, dels);
647 }
648
649 struct checkdiff_t {
650 struct xdiff_emit_state xm;
651 const char *filename;
652 int lineno;
653 };
654
655 static void checkdiff_consume(void *priv, char *line, unsigned long len)
656 {
657 struct checkdiff_t *data = priv;
658
659 if (line[0] == '+') {
660 int i, spaces = 0;
661
662 data->lineno++;
663
664 /* check space before tab */
665 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
666 if (line[i] == ' ')
667 spaces++;
668 if (line[i - 1] == '\t' && spaces)
669 printf("%s:%d: space before tab:%.*s\n",
670 data->filename, data->lineno, (int)len, line);
671
672 /* check white space at line end */
673 if (line[len - 1] == '\n')
674 len--;
675 if (isspace(line[len - 1]))
676 printf("%s:%d: white space at end: %.*s\n",
677 data->filename, data->lineno, (int)len, line);
678 } else if (line[0] == ' ')
679 data->lineno++;
680 else if (line[0] == '@') {
681 char *plus = strchr(line, '+');
682 if (plus)
683 data->lineno = strtol(plus, NULL, 10);
684 else
685 die("invalid diff");
686 }
687 }
688
689 static unsigned char *deflate_it(char *data,
690 unsigned long size,
691 unsigned long *result_size)
692 {
693 int bound;
694 unsigned char *deflated;
695 z_stream stream;
696
697 memset(&stream, 0, sizeof(stream));
698 deflateInit(&stream, zlib_compression_level);
699 bound = deflateBound(&stream, size);
700 deflated = xmalloc(bound);
701 stream.next_out = deflated;
702 stream.avail_out = bound;
703
704 stream.next_in = (unsigned char *)data;
705 stream.avail_in = size;
706 while (deflate(&stream, Z_FINISH) == Z_OK)
707 ; /* nothing */
708 deflateEnd(&stream);
709 *result_size = stream.total_out;
710 return deflated;
711 }
712
713 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
714 {
715 void *cp;
716 void *delta;
717 void *deflated;
718 void *data;
719 unsigned long orig_size;
720 unsigned long delta_size;
721 unsigned long deflate_size;
722 unsigned long data_size;
723
724 /* We could do deflated delta, or we could do just deflated two,
725 * whichever is smaller.
726 */
727 delta = NULL;
728 deflated = deflate_it(two->ptr, two->size, &deflate_size);
729 if (one->size && two->size) {
730 delta = diff_delta(one->ptr, one->size,
731 two->ptr, two->size,
732 &delta_size, deflate_size);
733 if (delta) {
734 void *to_free = delta;
735 orig_size = delta_size;
736 delta = deflate_it(delta, delta_size, &delta_size);
737 free(to_free);
738 }
739 }
740
741 if (delta && delta_size < deflate_size) {
742 printf("delta %lu\n", orig_size);
743 free(deflated);
744 data = delta;
745 data_size = delta_size;
746 }
747 else {
748 printf("literal %lu\n", two->size);
749 free(delta);
750 data = deflated;
751 data_size = deflate_size;
752 }
753
754 /* emit data encoded in base85 */
755 cp = data;
756 while (data_size) {
757 int bytes = (52 < data_size) ? 52 : data_size;
758 char line[70];
759 data_size -= bytes;
760 if (bytes <= 26)
761 line[0] = bytes + 'A' - 1;
762 else
763 line[0] = bytes - 26 + 'a' - 1;
764 encode_85(line + 1, cp, bytes);
765 cp = (char *) cp + bytes;
766 puts(line);
767 }
768 printf("\n");
769 free(data);
770 }
771
772 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
773 {
774 printf("GIT binary patch\n");
775 emit_binary_diff_body(one, two);
776 emit_binary_diff_body(two, one);
777 }
778
779 #define FIRST_FEW_BYTES 8000
780 static int mmfile_is_binary(mmfile_t *mf)
781 {
782 long sz = mf->size;
783 if (FIRST_FEW_BYTES < sz)
784 sz = FIRST_FEW_BYTES;
785 return !!memchr(mf->ptr, 0, sz);
786 }
787
788 static void builtin_diff(const char *name_a,
789 const char *name_b,
790 struct diff_filespec *one,
791 struct diff_filespec *two,
792 const char *xfrm_msg,
793 struct diff_options *o,
794 int complete_rewrite)
795 {
796 mmfile_t mf1, mf2;
797 const char *lbl[2];
798 char *a_one, *b_two;
799 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
800 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
801
802 a_one = quote_two("a/", name_a);
803 b_two = quote_two("b/", name_b);
804 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
805 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
806 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
807 if (lbl[0][0] == '/') {
808 /* /dev/null */
809 printf("%snew file mode %06o%s\n", set, two->mode, reset);
810 if (xfrm_msg && xfrm_msg[0])
811 printf("%s%s%s\n", set, xfrm_msg, reset);
812 }
813 else if (lbl[1][0] == '/') {
814 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
815 if (xfrm_msg && xfrm_msg[0])
816 printf("%s%s%s\n", set, xfrm_msg, reset);
817 }
818 else {
819 if (one->mode != two->mode) {
820 printf("%sold mode %06o%s\n", set, one->mode, reset);
821 printf("%snew mode %06o%s\n", set, two->mode, reset);
822 }
823 if (xfrm_msg && xfrm_msg[0])
824 printf("%s%s%s\n", set, xfrm_msg, reset);
825 /*
826 * we do not run diff between different kind
827 * of objects.
828 */
829 if ((one->mode ^ two->mode) & S_IFMT)
830 goto free_ab_and_return;
831 if (complete_rewrite) {
832 emit_rewrite_diff(name_a, name_b, one, two);
833 goto free_ab_and_return;
834 }
835 }
836
837 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
838 die("unable to read files to diff");
839
840 if (!o->text && (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))) {
841 /* Quite common confusing case */
842 if (mf1.size == mf2.size &&
843 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
844 goto free_ab_and_return;
845 if (o->binary)
846 emit_binary_diff(&mf1, &mf2);
847 else
848 printf("Binary files %s and %s differ\n",
849 lbl[0], lbl[1]);
850 }
851 else {
852 /* Crazy xdl interfaces.. */
853 const char *diffopts = getenv("GIT_DIFF_OPTS");
854 xpparam_t xpp;
855 xdemitconf_t xecfg;
856 xdemitcb_t ecb;
857 struct emit_callback ecbdata;
858
859 memset(&ecbdata, 0, sizeof(ecbdata));
860 ecbdata.label_path = lbl;
861 ecbdata.color_diff = o->color_diff;
862 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
863 xecfg.ctxlen = o->context;
864 xecfg.flags = XDL_EMIT_FUNCNAMES;
865 if (!diffopts)
866 ;
867 else if (!strncmp(diffopts, "--unified=", 10))
868 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
869 else if (!strncmp(diffopts, "-u", 2))
870 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
871 ecb.outf = xdiff_outf;
872 ecb.priv = &ecbdata;
873 ecbdata.xm.consume = fn_out_consume;
874 if (o->color_diff_words)
875 ecbdata.diff_words =
876 xcalloc(1, sizeof(struct diff_words_data));
877 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
878 if (o->color_diff_words)
879 free_diff_words_data(&ecbdata);
880 }
881
882 free_ab_and_return:
883 free(a_one);
884 free(b_two);
885 return;
886 }
887
888 static void builtin_diffstat(const char *name_a, const char *name_b,
889 struct diff_filespec *one,
890 struct diff_filespec *two,
891 struct diffstat_t *diffstat,
892 struct diff_options *o,
893 int complete_rewrite)
894 {
895 mmfile_t mf1, mf2;
896 struct diffstat_file *data;
897
898 data = diffstat_add(diffstat, name_a, name_b);
899
900 if (!one || !two) {
901 data->is_unmerged = 1;
902 return;
903 }
904 if (complete_rewrite) {
905 diff_populate_filespec(one, 0);
906 diff_populate_filespec(two, 0);
907 data->deleted = count_lines(one->data, one->size);
908 data->added = count_lines(two->data, two->size);
909 return;
910 }
911 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
912 die("unable to read files to diff");
913
914 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
915 data->is_binary = 1;
916 else {
917 /* Crazy xdl interfaces.. */
918 xpparam_t xpp;
919 xdemitconf_t xecfg;
920 xdemitcb_t ecb;
921
922 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
923 xecfg.ctxlen = 0;
924 xecfg.flags = 0;
925 ecb.outf = xdiff_outf;
926 ecb.priv = diffstat;
927 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
928 }
929 }
930
931 static void builtin_checkdiff(const char *name_a, const char *name_b,
932 struct diff_filespec *one,
933 struct diff_filespec *two)
934 {
935 mmfile_t mf1, mf2;
936 struct checkdiff_t data;
937
938 if (!two)
939 return;
940
941 memset(&data, 0, sizeof(data));
942 data.xm.consume = checkdiff_consume;
943 data.filename = name_b ? name_b : name_a;
944 data.lineno = 0;
945
946 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
947 die("unable to read files to diff");
948
949 if (mmfile_is_binary(&mf2))
950 return;
951 else {
952 /* Crazy xdl interfaces.. */
953 xpparam_t xpp;
954 xdemitconf_t xecfg;
955 xdemitcb_t ecb;
956
957 xpp.flags = XDF_NEED_MINIMAL;
958 xecfg.ctxlen = 0;
959 xecfg.flags = 0;
960 ecb.outf = xdiff_outf;
961 ecb.priv = &data;
962 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
963 }
964 }
965
966 struct diff_filespec *alloc_filespec(const char *path)
967 {
968 int namelen = strlen(path);
969 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
970
971 memset(spec, 0, sizeof(*spec));
972 spec->path = (char *)(spec + 1);
973 memcpy(spec->path, path, namelen+1);
974 return spec;
975 }
976
977 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
978 unsigned short mode)
979 {
980 if (mode) {
981 spec->mode = canon_mode(mode);
982 hashcpy(spec->sha1, sha1);
983 spec->sha1_valid = !is_null_sha1(sha1);
984 }
985 }
986
987 /*
988 * Given a name and sha1 pair, if the dircache tells us the file in
989 * the work tree has that object contents, return true, so that
990 * prepare_temp_file() does not have to inflate and extract.
991 */
992 static int work_tree_matches(const char *name, const unsigned char *sha1)
993 {
994 struct cache_entry *ce;
995 struct stat st;
996 int pos, len;
997
998 /* We do not read the cache ourselves here, because the
999 * benchmark with my previous version that always reads cache
1000 * shows that it makes things worse for diff-tree comparing
1001 * two linux-2.6 kernel trees in an already checked out work
1002 * tree. This is because most diff-tree comparisons deal with
1003 * only a small number of files, while reading the cache is
1004 * expensive for a large project, and its cost outweighs the
1005 * savings we get by not inflating the object to a temporary
1006 * file. Practically, this code only helps when we are used
1007 * by diff-cache --cached, which does read the cache before
1008 * calling us.
1009 */
1010 if (!active_cache)
1011 return 0;
1012
1013 len = strlen(name);
1014 pos = cache_name_pos(name, len);
1015 if (pos < 0)
1016 return 0;
1017 ce = active_cache[pos];
1018 if ((lstat(name, &st) < 0) ||
1019 !S_ISREG(st.st_mode) || /* careful! */
1020 ce_match_stat(ce, &st, 0) ||
1021 hashcmp(sha1, ce->sha1))
1022 return 0;
1023 /* we return 1 only when we can stat, it is a regular file,
1024 * stat information matches, and sha1 recorded in the cache
1025 * matches. I.e. we know the file in the work tree really is
1026 * the same as the <name, sha1> pair.
1027 */
1028 return 1;
1029 }
1030
1031 static struct sha1_size_cache {
1032 unsigned char sha1[20];
1033 unsigned long size;
1034 } **sha1_size_cache;
1035 static int sha1_size_cache_nr, sha1_size_cache_alloc;
1036
1037 static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
1038 int find_only,
1039 unsigned long size)
1040 {
1041 int first, last;
1042 struct sha1_size_cache *e;
1043
1044 first = 0;
1045 last = sha1_size_cache_nr;
1046 while (last > first) {
1047 int cmp, next = (last + first) >> 1;
1048 e = sha1_size_cache[next];
1049 cmp = hashcmp(e->sha1, sha1);
1050 if (!cmp)
1051 return e;
1052 if (cmp < 0) {
1053 last = next;
1054 continue;
1055 }
1056 first = next+1;
1057 }
1058 /* not found */
1059 if (find_only)
1060 return NULL;
1061 /* insert to make it at "first" */
1062 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
1063 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
1064 sha1_size_cache = xrealloc(sha1_size_cache,
1065 sha1_size_cache_alloc *
1066 sizeof(*sha1_size_cache));
1067 }
1068 sha1_size_cache_nr++;
1069 if (first < sha1_size_cache_nr)
1070 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
1071 (sha1_size_cache_nr - first - 1) *
1072 sizeof(*sha1_size_cache));
1073 e = xmalloc(sizeof(struct sha1_size_cache));
1074 sha1_size_cache[first] = e;
1075 hashcpy(e->sha1, sha1);
1076 e->size = size;
1077 return e;
1078 }
1079
1080 /*
1081 * While doing rename detection and pickaxe operation, we may need to
1082 * grab the data for the blob (or file) for our own in-core comparison.
1083 * diff_filespec has data and size fields for this purpose.
1084 */
1085 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1086 {
1087 int err = 0;
1088 if (!DIFF_FILE_VALID(s))
1089 die("internal error: asking to populate invalid file.");
1090 if (S_ISDIR(s->mode))
1091 return -1;
1092
1093 if (!use_size_cache)
1094 size_only = 0;
1095
1096 if (s->data)
1097 return err;
1098 if (!s->sha1_valid ||
1099 work_tree_matches(s->path, s->sha1)) {
1100 struct stat st;
1101 int fd;
1102 if (lstat(s->path, &st) < 0) {
1103 if (errno == ENOENT) {
1104 err_empty:
1105 err = -1;
1106 empty:
1107 s->data = (char *)"";
1108 s->size = 0;
1109 return err;
1110 }
1111 }
1112 s->size = st.st_size;
1113 if (!s->size)
1114 goto empty;
1115 if (size_only)
1116 return 0;
1117 if (S_ISLNK(st.st_mode)) {
1118 int ret;
1119 s->data = xmalloc(s->size);
1120 s->should_free = 1;
1121 ret = readlink(s->path, s->data, s->size);
1122 if (ret < 0) {
1123 free(s->data);
1124 goto err_empty;
1125 }
1126 return 0;
1127 }
1128 fd = open(s->path, O_RDONLY);
1129 if (fd < 0)
1130 goto err_empty;
1131 s->data = mmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1132 close(fd);
1133 if (s->data == MAP_FAILED)
1134 goto err_empty;
1135 s->should_munmap = 1;
1136 }
1137 else {
1138 char type[20];
1139 struct sha1_size_cache *e;
1140
1141 if (size_only) {
1142 e = locate_size_cache(s->sha1, 1, 0);
1143 if (e) {
1144 s->size = e->size;
1145 return 0;
1146 }
1147 if (!sha1_object_info(s->sha1, type, &s->size))
1148 locate_size_cache(s->sha1, 0, s->size);
1149 }
1150 else {
1151 s->data = read_sha1_file(s->sha1, type, &s->size);
1152 s->should_free = 1;
1153 }
1154 }
1155 return 0;
1156 }
1157
1158 void diff_free_filespec_data(struct diff_filespec *s)
1159 {
1160 if (s->should_free)
1161 free(s->data);
1162 else if (s->should_munmap)
1163 munmap(s->data, s->size);
1164 s->should_free = s->should_munmap = 0;
1165 s->data = NULL;
1166 free(s->cnt_data);
1167 s->cnt_data = NULL;
1168 }
1169
1170 static void prep_temp_blob(struct diff_tempfile *temp,
1171 void *blob,
1172 unsigned long size,
1173 const unsigned char *sha1,
1174 int mode)
1175 {
1176 int fd;
1177
1178 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
1179 if (fd < 0)
1180 die("unable to create temp-file");
1181 if (write(fd, blob, size) != size)
1182 die("unable to write temp-file");
1183 close(fd);
1184 temp->name = temp->tmp_path;
1185 strcpy(temp->hex, sha1_to_hex(sha1));
1186 temp->hex[40] = 0;
1187 sprintf(temp->mode, "%06o", mode);
1188 }
1189
1190 static void prepare_temp_file(const char *name,
1191 struct diff_tempfile *temp,
1192 struct diff_filespec *one)
1193 {
1194 if (!DIFF_FILE_VALID(one)) {
1195 not_a_valid_file:
1196 /* A '-' entry produces this for file-2, and
1197 * a '+' entry produces this for file-1.
1198 */
1199 temp->name = "/dev/null";
1200 strcpy(temp->hex, ".");
1201 strcpy(temp->mode, ".");
1202 return;
1203 }
1204
1205 if (!one->sha1_valid ||
1206 work_tree_matches(name, one->sha1)) {
1207 struct stat st;
1208 if (lstat(name, &st) < 0) {
1209 if (errno == ENOENT)
1210 goto not_a_valid_file;
1211 die("stat(%s): %s", name, strerror(errno));
1212 }
1213 if (S_ISLNK(st.st_mode)) {
1214 int ret;
1215 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1216 if (sizeof(buf) <= st.st_size)
1217 die("symlink too long: %s", name);
1218 ret = readlink(name, buf, st.st_size);
1219 if (ret < 0)
1220 die("readlink(%s)", name);
1221 prep_temp_blob(temp, buf, st.st_size,
1222 (one->sha1_valid ?
1223 one->sha1 : null_sha1),
1224 (one->sha1_valid ?
1225 one->mode : S_IFLNK));
1226 }
1227 else {
1228 /* we can borrow from the file in the work tree */
1229 temp->name = name;
1230 if (!one->sha1_valid)
1231 strcpy(temp->hex, sha1_to_hex(null_sha1));
1232 else
1233 strcpy(temp->hex, sha1_to_hex(one->sha1));
1234 /* Even though we may sometimes borrow the
1235 * contents from the work tree, we always want
1236 * one->mode. mode is trustworthy even when
1237 * !(one->sha1_valid), as long as
1238 * DIFF_FILE_VALID(one).
1239 */
1240 sprintf(temp->mode, "%06o", one->mode);
1241 }
1242 return;
1243 }
1244 else {
1245 if (diff_populate_filespec(one, 0))
1246 die("cannot read data blob for %s", one->path);
1247 prep_temp_blob(temp, one->data, one->size,
1248 one->sha1, one->mode);
1249 }
1250 }
1251
1252 static void remove_tempfile(void)
1253 {
1254 int i;
1255
1256 for (i = 0; i < 2; i++)
1257 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1258 unlink(diff_temp[i].name);
1259 diff_temp[i].name = NULL;
1260 }
1261 }
1262
1263 static void remove_tempfile_on_signal(int signo)
1264 {
1265 remove_tempfile();
1266 signal(SIGINT, SIG_DFL);
1267 raise(signo);
1268 }
1269
1270 static int spawn_prog(const char *pgm, const char **arg)
1271 {
1272 pid_t pid;
1273 int status;
1274
1275 fflush(NULL);
1276 pid = fork();
1277 if (pid < 0)
1278 die("unable to fork");
1279 if (!pid) {
1280 execvp(pgm, (char *const*) arg);
1281 exit(255);
1282 }
1283
1284 while (waitpid(pid, &status, 0) < 0) {
1285 if (errno == EINTR)
1286 continue;
1287 return -1;
1288 }
1289
1290 /* Earlier we did not check the exit status because
1291 * diff exits non-zero if files are different, and
1292 * we are not interested in knowing that. It was a
1293 * mistake which made it harder to quit a diff-*
1294 * session that uses the git-apply-patch-script as
1295 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1296 * should also exit non-zero only when it wants to
1297 * abort the entire diff-* session.
1298 */
1299 if (WIFEXITED(status) && !WEXITSTATUS(status))
1300 return 0;
1301 return -1;
1302 }
1303
1304 /* An external diff command takes:
1305 *
1306 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1307 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1308 *
1309 */
1310 static void run_external_diff(const char *pgm,
1311 const char *name,
1312 const char *other,
1313 struct diff_filespec *one,
1314 struct diff_filespec *two,
1315 const char *xfrm_msg,
1316 int complete_rewrite)
1317 {
1318 const char *spawn_arg[10];
1319 struct diff_tempfile *temp = diff_temp;
1320 int retval;
1321 static int atexit_asked = 0;
1322 const char *othername;
1323 const char **arg = &spawn_arg[0];
1324
1325 othername = (other? other : name);
1326 if (one && two) {
1327 prepare_temp_file(name, &temp[0], one);
1328 prepare_temp_file(othername, &temp[1], two);
1329 if (! atexit_asked &&
1330 (temp[0].name == temp[0].tmp_path ||
1331 temp[1].name == temp[1].tmp_path)) {
1332 atexit_asked = 1;
1333 atexit(remove_tempfile);
1334 }
1335 signal(SIGINT, remove_tempfile_on_signal);
1336 }
1337
1338 if (one && two) {
1339 *arg++ = pgm;
1340 *arg++ = name;
1341 *arg++ = temp[0].name;
1342 *arg++ = temp[0].hex;
1343 *arg++ = temp[0].mode;
1344 *arg++ = temp[1].name;
1345 *arg++ = temp[1].hex;
1346 *arg++ = temp[1].mode;
1347 if (other) {
1348 *arg++ = other;
1349 *arg++ = xfrm_msg;
1350 }
1351 } else {
1352 *arg++ = pgm;
1353 *arg++ = name;
1354 }
1355 *arg = NULL;
1356 retval = spawn_prog(pgm, spawn_arg);
1357 remove_tempfile();
1358 if (retval) {
1359 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1360 exit(1);
1361 }
1362 }
1363
1364 static void run_diff_cmd(const char *pgm,
1365 const char *name,
1366 const char *other,
1367 struct diff_filespec *one,
1368 struct diff_filespec *two,
1369 const char *xfrm_msg,
1370 struct diff_options *o,
1371 int complete_rewrite)
1372 {
1373 if (pgm) {
1374 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1375 complete_rewrite);
1376 return;
1377 }
1378 if (one && two)
1379 builtin_diff(name, other ? other : name,
1380 one, two, xfrm_msg, o, complete_rewrite);
1381 else
1382 printf("* Unmerged path %s\n", name);
1383 }
1384
1385 static void diff_fill_sha1_info(struct diff_filespec *one)
1386 {
1387 if (DIFF_FILE_VALID(one)) {
1388 if (!one->sha1_valid) {
1389 struct stat st;
1390 if (lstat(one->path, &st) < 0)
1391 die("stat %s", one->path);
1392 if (index_path(one->sha1, one->path, &st, 0))
1393 die("cannot hash %s\n", one->path);
1394 }
1395 }
1396 else
1397 hashclr(one->sha1);
1398 }
1399
1400 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1401 {
1402 const char *pgm = external_diff();
1403 char msg[PATH_MAX*2+300], *xfrm_msg;
1404 struct diff_filespec *one;
1405 struct diff_filespec *two;
1406 const char *name;
1407 const char *other;
1408 char *name_munged, *other_munged;
1409 int complete_rewrite = 0;
1410 int len;
1411
1412 if (DIFF_PAIR_UNMERGED(p)) {
1413 /* unmerged */
1414 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1415 return;
1416 }
1417
1418 name = p->one->path;
1419 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1420 name_munged = quote_one(name);
1421 other_munged = quote_one(other);
1422 one = p->one; two = p->two;
1423
1424 diff_fill_sha1_info(one);
1425 diff_fill_sha1_info(two);
1426
1427 len = 0;
1428 switch (p->status) {
1429 case DIFF_STATUS_COPIED:
1430 len += snprintf(msg + len, sizeof(msg) - len,
1431 "similarity index %d%%\n"
1432 "copy from %s\n"
1433 "copy to %s\n",
1434 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1435 name_munged, other_munged);
1436 break;
1437 case DIFF_STATUS_RENAMED:
1438 len += snprintf(msg + len, sizeof(msg) - len,
1439 "similarity index %d%%\n"
1440 "rename from %s\n"
1441 "rename to %s\n",
1442 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1443 name_munged, other_munged);
1444 break;
1445 case DIFF_STATUS_MODIFIED:
1446 if (p->score) {
1447 len += snprintf(msg + len, sizeof(msg) - len,
1448 "dissimilarity index %d%%\n",
1449 (int)(0.5 + p->score *
1450 100.0/MAX_SCORE));
1451 complete_rewrite = 1;
1452 break;
1453 }
1454 /* fallthru */
1455 default:
1456 /* nothing */
1457 ;
1458 }
1459
1460 if (hashcmp(one->sha1, two->sha1)) {
1461 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1462
1463 if (o->binary) {
1464 mmfile_t mf;
1465 if ((!fill_mmfile(&mf, one) && mmfile_is_binary(&mf)) ||
1466 (!fill_mmfile(&mf, two) && mmfile_is_binary(&mf)))
1467 abbrev = 40;
1468 }
1469 len += snprintf(msg + len, sizeof(msg) - len,
1470 "index %.*s..%.*s",
1471 abbrev, sha1_to_hex(one->sha1),
1472 abbrev, sha1_to_hex(two->sha1));
1473 if (one->mode == two->mode)
1474 len += snprintf(msg + len, sizeof(msg) - len,
1475 " %06o", one->mode);
1476 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1477 }
1478
1479 if (len)
1480 msg[--len] = 0;
1481 xfrm_msg = len ? msg : NULL;
1482
1483 if (!pgm &&
1484 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1485 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1486 /* a filepair that changes between file and symlink
1487 * needs to be split into deletion and creation.
1488 */
1489 struct diff_filespec *null = alloc_filespec(two->path);
1490 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1491 free(null);
1492 null = alloc_filespec(one->path);
1493 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1494 free(null);
1495 }
1496 else
1497 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1498 complete_rewrite);
1499
1500 free(name_munged);
1501 free(other_munged);
1502 }
1503
1504 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1505 struct diffstat_t *diffstat)
1506 {
1507 const char *name;
1508 const char *other;
1509 int complete_rewrite = 0;
1510
1511 if (DIFF_PAIR_UNMERGED(p)) {
1512 /* unmerged */
1513 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1514 return;
1515 }
1516
1517 name = p->one->path;
1518 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1519
1520 diff_fill_sha1_info(p->one);
1521 diff_fill_sha1_info(p->two);
1522
1523 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1524 complete_rewrite = 1;
1525 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
1526 }
1527
1528 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1529 {
1530 const char *name;
1531 const char *other;
1532
1533 if (DIFF_PAIR_UNMERGED(p)) {
1534 /* unmerged */
1535 return;
1536 }
1537
1538 name = p->one->path;
1539 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1540
1541 diff_fill_sha1_info(p->one);
1542 diff_fill_sha1_info(p->two);
1543
1544 builtin_checkdiff(name, other, p->one, p->two);
1545 }
1546
1547 void diff_setup(struct diff_options *options)
1548 {
1549 memset(options, 0, sizeof(*options));
1550 options->line_termination = '\n';
1551 options->break_opt = -1;
1552 options->rename_limit = -1;
1553 options->context = 3;
1554 options->msg_sep = "";
1555
1556 options->change = diff_change;
1557 options->add_remove = diff_addremove;
1558 options->color_diff = diff_use_color_default;
1559 options->detect_rename = diff_detect_rename_default;
1560 }
1561
1562 int diff_setup_done(struct diff_options *options)
1563 {
1564 int count = 0;
1565
1566 if (options->output_format & DIFF_FORMAT_NAME)
1567 count++;
1568 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
1569 count++;
1570 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
1571 count++;
1572 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
1573 count++;
1574 if (count > 1)
1575 die("--name-only, --name-status, --check and -s are mutually exclusive");
1576
1577 if (options->find_copies_harder)
1578 options->detect_rename = DIFF_DETECT_COPY;
1579
1580 if (options->output_format & (DIFF_FORMAT_NAME |
1581 DIFF_FORMAT_NAME_STATUS |
1582 DIFF_FORMAT_CHECKDIFF |
1583 DIFF_FORMAT_NO_OUTPUT))
1584 options->output_format &= ~(DIFF_FORMAT_RAW |
1585 DIFF_FORMAT_DIFFSTAT |
1586 DIFF_FORMAT_SUMMARY |
1587 DIFF_FORMAT_PATCH);
1588
1589 /*
1590 * These cases always need recursive; we do not drop caller-supplied
1591 * recursive bits for other formats here.
1592 */
1593 if (options->output_format & (DIFF_FORMAT_PATCH |
1594 DIFF_FORMAT_DIFFSTAT |
1595 DIFF_FORMAT_CHECKDIFF))
1596 options->recursive = 1;
1597 /*
1598 * Also pickaxe would not work very well if you do not say recursive
1599 */
1600 if (options->pickaxe)
1601 options->recursive = 1;
1602
1603 if (options->detect_rename && options->rename_limit < 0)
1604 options->rename_limit = diff_rename_limit_default;
1605 if (options->setup & DIFF_SETUP_USE_CACHE) {
1606 if (!active_cache)
1607 /* read-cache does not die even when it fails
1608 * so it is safe for us to do this here. Also
1609 * it does not smudge active_cache or active_nr
1610 * when it fails, so we do not have to worry about
1611 * cleaning it up ourselves either.
1612 */
1613 read_cache();
1614 }
1615 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
1616 use_size_cache = 1;
1617 if (options->abbrev <= 0 || 40 < options->abbrev)
1618 options->abbrev = 40; /* full */
1619
1620 return 0;
1621 }
1622
1623 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
1624 {
1625 char c, *eq;
1626 int len;
1627
1628 if (*arg != '-')
1629 return 0;
1630 c = *++arg;
1631 if (!c)
1632 return 0;
1633 if (c == arg_short) {
1634 c = *++arg;
1635 if (!c)
1636 return 1;
1637 if (val && isdigit(c)) {
1638 char *end;
1639 int n = strtoul(arg, &end, 10);
1640 if (*end)
1641 return 0;
1642 *val = n;
1643 return 1;
1644 }
1645 return 0;
1646 }
1647 if (c != '-')
1648 return 0;
1649 arg++;
1650 eq = strchr(arg, '=');
1651 if (eq)
1652 len = eq - arg;
1653 else
1654 len = strlen(arg);
1655 if (!len || strncmp(arg, arg_long, len))
1656 return 0;
1657 if (eq) {
1658 int n;
1659 char *end;
1660 if (!isdigit(*++eq))
1661 return 0;
1662 n = strtoul(eq, &end, 10);
1663 if (*end)
1664 return 0;
1665 *val = n;
1666 }
1667 return 1;
1668 }
1669
1670 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
1671 {
1672 const char *arg = av[0];
1673 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
1674 options->output_format |= DIFF_FORMAT_PATCH;
1675 else if (opt_arg(arg, 'U', "unified", &options->context))
1676 options->output_format |= DIFF_FORMAT_PATCH;
1677 else if (!strcmp(arg, "--raw"))
1678 options->output_format |= DIFF_FORMAT_RAW;
1679 else if (!strcmp(arg, "--patch-with-raw")) {
1680 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
1681 }
1682 else if (!strcmp(arg, "--stat"))
1683 options->output_format |= DIFF_FORMAT_DIFFSTAT;
1684 else if (!strcmp(arg, "--check"))
1685 options->output_format |= DIFF_FORMAT_CHECKDIFF;
1686 else if (!strcmp(arg, "--summary"))
1687 options->output_format |= DIFF_FORMAT_SUMMARY;
1688 else if (!strcmp(arg, "--patch-with-stat")) {
1689 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
1690 }
1691 else if (!strcmp(arg, "-z"))
1692 options->line_termination = 0;
1693 else if (!strncmp(arg, "-l", 2))
1694 options->rename_limit = strtoul(arg+2, NULL, 10);
1695 else if (!strcmp(arg, "--full-index"))
1696 options->full_index = 1;
1697 else if (!strcmp(arg, "--binary")) {
1698 options->output_format |= DIFF_FORMAT_PATCH;
1699 options->binary = 1;
1700 }
1701 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
1702 options->text = 1;
1703 }
1704 else if (!strcmp(arg, "--name-only"))
1705 options->output_format |= DIFF_FORMAT_NAME;
1706 else if (!strcmp(arg, "--name-status"))
1707 options->output_format |= DIFF_FORMAT_NAME_STATUS;
1708 else if (!strcmp(arg, "-R"))
1709 options->reverse_diff = 1;
1710 else if (!strncmp(arg, "-S", 2))
1711 options->pickaxe = arg + 2;
1712 else if (!strcmp(arg, "-s")) {
1713 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
1714 }
1715 else if (!strncmp(arg, "-O", 2))
1716 options->orderfile = arg + 2;
1717 else if (!strncmp(arg, "--diff-filter=", 14))
1718 options->filter = arg + 14;
1719 else if (!strcmp(arg, "--pickaxe-all"))
1720 options->pickaxe_opts = DIFF_PICKAXE_ALL;
1721 else if (!strcmp(arg, "--pickaxe-regex"))
1722 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
1723 else if (!strncmp(arg, "-B", 2)) {
1724 if ((options->break_opt =
1725 diff_scoreopt_parse(arg)) == -1)
1726 return -1;
1727 }
1728 else if (!strncmp(arg, "-M", 2)) {
1729 if ((options->rename_score =
1730 diff_scoreopt_parse(arg)) == -1)
1731 return -1;
1732 options->detect_rename = DIFF_DETECT_RENAME;
1733 }
1734 else if (!strncmp(arg, "-C", 2)) {
1735 if ((options->rename_score =
1736 diff_scoreopt_parse(arg)) == -1)
1737 return -1;
1738 options->detect_rename = DIFF_DETECT_COPY;
1739 }
1740 else if (!strcmp(arg, "--find-copies-harder"))
1741 options->find_copies_harder = 1;
1742 else if (!strcmp(arg, "--abbrev"))
1743 options->abbrev = DEFAULT_ABBREV;
1744 else if (!strncmp(arg, "--abbrev=", 9)) {
1745 options->abbrev = strtoul(arg + 9, NULL, 10);
1746 if (options->abbrev < MINIMUM_ABBREV)
1747 options->abbrev = MINIMUM_ABBREV;
1748 else if (40 < options->abbrev)
1749 options->abbrev = 40;
1750 }
1751 else if (!strcmp(arg, "--color"))
1752 options->color_diff = 1;
1753 else if (!strcmp(arg, "--no-color"))
1754 options->color_diff = 0;
1755 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
1756 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
1757 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
1758 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
1759 else if (!strcmp(arg, "--color-words"))
1760 options->color_diff = options->color_diff_words = 1;
1761 else if (!strcmp(arg, "--no-renames"))
1762 options->detect_rename = 0;
1763 else
1764 return 0;
1765 return 1;
1766 }
1767
1768 static int parse_num(const char **cp_p)
1769 {
1770 unsigned long num, scale;
1771 int ch, dot;
1772 const char *cp = *cp_p;
1773
1774 num = 0;
1775 scale = 1;
1776 dot = 0;
1777 for(;;) {
1778 ch = *cp;
1779 if ( !dot && ch == '.' ) {
1780 scale = 1;
1781 dot = 1;
1782 } else if ( ch == '%' ) {
1783 scale = dot ? scale*100 : 100;
1784 cp++; /* % is always at the end */
1785 break;
1786 } else if ( ch >= '0' && ch <= '9' ) {
1787 if ( scale < 100000 ) {
1788 scale *= 10;
1789 num = (num*10) + (ch-'0');
1790 }
1791 } else {
1792 break;
1793 }
1794 cp++;
1795 }
1796 *cp_p = cp;
1797
1798 /* user says num divided by scale and we say internally that
1799 * is MAX_SCORE * num / scale.
1800 */
1801 return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
1802 }
1803
1804 int diff_scoreopt_parse(const char *opt)
1805 {
1806 int opt1, opt2, cmd;
1807
1808 if (*opt++ != '-')
1809 return -1;
1810 cmd = *opt++;
1811 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
1812 return -1; /* that is not a -M, -C nor -B option */
1813
1814 opt1 = parse_num(&opt);
1815 if (cmd != 'B')
1816 opt2 = 0;
1817 else {
1818 if (*opt == 0)
1819 opt2 = 0;
1820 else if (*opt != '/')
1821 return -1; /* we expect -B80/99 or -B80 */
1822 else {
1823 opt++;
1824 opt2 = parse_num(&opt);
1825 }
1826 }
1827 if (*opt != 0)
1828 return -1;
1829 return opt1 | (opt2 << 16);
1830 }
1831
1832 struct diff_queue_struct diff_queued_diff;
1833
1834 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
1835 {
1836 if (queue->alloc <= queue->nr) {
1837 queue->alloc = alloc_nr(queue->alloc);
1838 queue->queue = xrealloc(queue->queue,
1839 sizeof(dp) * queue->alloc);
1840 }
1841 queue->queue[queue->nr++] = dp;
1842 }
1843
1844 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
1845 struct diff_filespec *one,
1846 struct diff_filespec *two)
1847 {
1848 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
1849 dp->one = one;
1850 dp->two = two;
1851 if (queue)
1852 diff_q(queue, dp);
1853 return dp;
1854 }
1855
1856 void diff_free_filepair(struct diff_filepair *p)
1857 {
1858 diff_free_filespec_data(p->one);
1859 diff_free_filespec_data(p->two);
1860 free(p->one);
1861 free(p->two);
1862 free(p);
1863 }
1864
1865 /* This is different from find_unique_abbrev() in that
1866 * it stuffs the result with dots for alignment.
1867 */
1868 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
1869 {
1870 int abblen;
1871 const char *abbrev;
1872 if (len == 40)
1873 return sha1_to_hex(sha1);
1874
1875 abbrev = find_unique_abbrev(sha1, len);
1876 if (!abbrev)
1877 return sha1_to_hex(sha1);
1878 abblen = strlen(abbrev);
1879 if (abblen < 37) {
1880 static char hex[41];
1881 if (len < abblen && abblen <= len + 2)
1882 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
1883 else
1884 sprintf(hex, "%s...", abbrev);
1885 return hex;
1886 }
1887 return sha1_to_hex(sha1);
1888 }
1889
1890 static void diff_flush_raw(struct diff_filepair *p,
1891 struct diff_options *options)
1892 {
1893 int two_paths;
1894 char status[10];
1895 int abbrev = options->abbrev;
1896 const char *path_one, *path_two;
1897 int inter_name_termination = '\t';
1898 int line_termination = options->line_termination;
1899
1900 if (!line_termination)
1901 inter_name_termination = 0;
1902
1903 path_one = p->one->path;
1904 path_two = p->two->path;
1905 if (line_termination) {
1906 path_one = quote_one(path_one);
1907 path_two = quote_one(path_two);
1908 }
1909
1910 if (p->score)
1911 sprintf(status, "%c%03d", p->status,
1912 (int)(0.5 + p->score * 100.0/MAX_SCORE));
1913 else {
1914 status[0] = p->status;
1915 status[1] = 0;
1916 }
1917 switch (p->status) {
1918 case DIFF_STATUS_COPIED:
1919 case DIFF_STATUS_RENAMED:
1920 two_paths = 1;
1921 break;
1922 case DIFF_STATUS_ADDED:
1923 case DIFF_STATUS_DELETED:
1924 two_paths = 0;
1925 break;
1926 default:
1927 two_paths = 0;
1928 break;
1929 }
1930 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
1931 printf(":%06o %06o %s ",
1932 p->one->mode, p->two->mode,
1933 diff_unique_abbrev(p->one->sha1, abbrev));
1934 printf("%s ",
1935 diff_unique_abbrev(p->two->sha1, abbrev));
1936 }
1937 printf("%s%c%s", status, inter_name_termination, path_one);
1938 if (two_paths)
1939 printf("%c%s", inter_name_termination, path_two);
1940 putchar(line_termination);
1941 if (path_one != p->one->path)
1942 free((void*)path_one);
1943 if (path_two != p->two->path)
1944 free((void*)path_two);
1945 }
1946
1947 static void diff_flush_name(struct diff_filepair *p, int line_termination)
1948 {
1949 char *path = p->two->path;
1950
1951 if (line_termination)
1952 path = quote_one(p->two->path);
1953 printf("%s%c", path, line_termination);
1954 if (p->two->path != path)
1955 free(path);
1956 }
1957
1958 int diff_unmodified_pair(struct diff_filepair *p)
1959 {
1960 /* This function is written stricter than necessary to support
1961 * the currently implemented transformers, but the idea is to
1962 * let transformers to produce diff_filepairs any way they want,
1963 * and filter and clean them up here before producing the output.
1964 */
1965 struct diff_filespec *one, *two;
1966
1967 if (DIFF_PAIR_UNMERGED(p))
1968 return 0; /* unmerged is interesting */
1969
1970 one = p->one;
1971 two = p->two;
1972
1973 /* deletion, addition, mode or type change
1974 * and rename are all interesting.
1975 */
1976 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
1977 DIFF_PAIR_MODE_CHANGED(p) ||
1978 strcmp(one->path, two->path))
1979 return 0;
1980
1981 /* both are valid and point at the same path. that is, we are
1982 * dealing with a change.
1983 */
1984 if (one->sha1_valid && two->sha1_valid &&
1985 !hashcmp(one->sha1, two->sha1))
1986 return 1; /* no change */
1987 if (!one->sha1_valid && !two->sha1_valid)
1988 return 1; /* both look at the same file on the filesystem. */
1989 return 0;
1990 }
1991
1992 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
1993 {
1994 if (diff_unmodified_pair(p))
1995 return;
1996
1997 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1998 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1999 return; /* no tree diffs in patch format */
2000
2001 run_diff(p, o);
2002 }
2003
2004 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2005 struct diffstat_t *diffstat)
2006 {
2007 if (diff_unmodified_pair(p))
2008 return;
2009
2010 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2011 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2012 return; /* no tree diffs in patch format */
2013
2014 run_diffstat(p, o, diffstat);
2015 }
2016
2017 static void diff_flush_checkdiff(struct diff_filepair *p,
2018 struct diff_options *o)
2019 {
2020 if (diff_unmodified_pair(p))
2021 return;
2022
2023 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2024 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2025 return; /* no tree diffs in patch format */
2026
2027 run_checkdiff(p, o);
2028 }
2029
2030 int diff_queue_is_empty(void)
2031 {
2032 struct diff_queue_struct *q = &diff_queued_diff;
2033 int i;
2034 for (i = 0; i < q->nr; i++)
2035 if (!diff_unmodified_pair(q->queue[i]))
2036 return 0;
2037 return 1;
2038 }
2039
2040 #if DIFF_DEBUG
2041 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2042 {
2043 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2044 x, one ? one : "",
2045 s->path,
2046 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2047 s->mode,
2048 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2049 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2050 x, one ? one : "",
2051 s->size, s->xfrm_flags);
2052 }
2053
2054 void diff_debug_filepair(const struct diff_filepair *p, int i)
2055 {
2056 diff_debug_filespec(p->one, i, "one");
2057 diff_debug_filespec(p->two, i, "two");
2058 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2059 p->score, p->status ? p->status : '?',
2060 p->source_stays, p->broken_pair);
2061 }
2062
2063 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2064 {
2065 int i;
2066 if (msg)
2067 fprintf(stderr, "%s\n", msg);
2068 fprintf(stderr, "q->nr = %d\n", q->nr);
2069 for (i = 0; i < q->nr; i++) {
2070 struct diff_filepair *p = q->queue[i];
2071 diff_debug_filepair(p, i);
2072 }
2073 }
2074 #endif
2075
2076 static void diff_resolve_rename_copy(void)
2077 {
2078 int i, j;
2079 struct diff_filepair *p, *pp;
2080 struct diff_queue_struct *q = &diff_queued_diff;
2081
2082 diff_debug_queue("resolve-rename-copy", q);
2083
2084 for (i = 0; i < q->nr; i++) {
2085 p = q->queue[i];
2086 p->status = 0; /* undecided */
2087 if (DIFF_PAIR_UNMERGED(p))
2088 p->status = DIFF_STATUS_UNMERGED;
2089 else if (!DIFF_FILE_VALID(p->one))
2090 p->status = DIFF_STATUS_ADDED;
2091 else if (!DIFF_FILE_VALID(p->two))
2092 p->status = DIFF_STATUS_DELETED;
2093 else if (DIFF_PAIR_TYPE_CHANGED(p))
2094 p->status = DIFF_STATUS_TYPE_CHANGED;
2095
2096 /* from this point on, we are dealing with a pair
2097 * whose both sides are valid and of the same type, i.e.
2098 * either in-place edit or rename/copy edit.
2099 */
2100 else if (DIFF_PAIR_RENAME(p)) {
2101 if (p->source_stays) {
2102 p->status = DIFF_STATUS_COPIED;
2103 continue;
2104 }
2105 /* See if there is some other filepair that
2106 * copies from the same source as us. If so
2107 * we are a copy. Otherwise we are either a
2108 * copy if the path stays, or a rename if it
2109 * does not, but we already handled "stays" case.
2110 */
2111 for (j = i + 1; j < q->nr; j++) {
2112 pp = q->queue[j];
2113 if (strcmp(pp->one->path, p->one->path))
2114 continue; /* not us */
2115 if (!DIFF_PAIR_RENAME(pp))
2116 continue; /* not a rename/copy */
2117 /* pp is a rename/copy from the same source */
2118 p->status = DIFF_STATUS_COPIED;
2119 break;
2120 }
2121 if (!p->status)
2122 p->status = DIFF_STATUS_RENAMED;
2123 }
2124 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2125 p->one->mode != p->two->mode)
2126 p->status = DIFF_STATUS_MODIFIED;
2127 else {
2128 /* This is a "no-change" entry and should not
2129 * happen anymore, but prepare for broken callers.
2130 */
2131 error("feeding unmodified %s to diffcore",
2132 p->one->path);
2133 p->status = DIFF_STATUS_UNKNOWN;
2134 }
2135 }
2136 diff_debug_queue("resolve-rename-copy done", q);
2137 }
2138
2139 static int check_pair_status(struct diff_filepair *p)
2140 {
2141 switch (p->status) {
2142 case DIFF_STATUS_UNKNOWN:
2143 return 0;
2144 case 0:
2145 die("internal error in diff-resolve-rename-copy");
2146 default:
2147 return 1;
2148 }
2149 }
2150
2151 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2152 {
2153 int fmt = opt->output_format;
2154
2155 if (fmt & DIFF_FORMAT_CHECKDIFF)
2156 diff_flush_checkdiff(p, opt);
2157 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2158 diff_flush_raw(p, opt);
2159 else if (fmt & DIFF_FORMAT_NAME)
2160 diff_flush_name(p, opt->line_termination);
2161 }
2162
2163 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2164 {
2165 if (fs->mode)
2166 printf(" %s mode %06o %s\n", newdelete, fs->mode, fs->path);
2167 else
2168 printf(" %s %s\n", newdelete, fs->path);
2169 }
2170
2171
2172 static void show_mode_change(struct diff_filepair *p, int show_name)
2173 {
2174 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2175 if (show_name)
2176 printf(" mode change %06o => %06o %s\n",
2177 p->one->mode, p->two->mode, p->two->path);
2178 else
2179 printf(" mode change %06o => %06o\n",
2180 p->one->mode, p->two->mode);
2181 }
2182 }
2183
2184 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2185 {
2186 const char *old, *new;
2187
2188 /* Find common prefix */
2189 old = p->one->path;
2190 new = p->two->path;
2191 while (1) {
2192 const char *slash_old, *slash_new;
2193 slash_old = strchr(old, '/');
2194 slash_new = strchr(new, '/');
2195 if (!slash_old ||
2196 !slash_new ||
2197 slash_old - old != slash_new - new ||
2198 memcmp(old, new, slash_new - new))
2199 break;
2200 old = slash_old + 1;
2201 new = slash_new + 1;
2202 }
2203 /* p->one->path thru old is the common prefix, and old and new
2204 * through the end of names are renames
2205 */
2206 if (old != p->one->path)
2207 printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
2208 (int)(old - p->one->path), p->one->path,
2209 old, new, (int)(0.5 + p->score * 100.0/MAX_SCORE));
2210 else
2211 printf(" %s %s => %s (%d%%)\n", renamecopy,
2212 p->one->path, p->two->path,
2213 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2214 show_mode_change(p, 0);
2215 }
2216
2217 static void diff_summary(struct diff_filepair *p)
2218 {
2219 switch(p->status) {
2220 case DIFF_STATUS_DELETED:
2221 show_file_mode_name("delete", p->one);
2222 break;
2223 case DIFF_STATUS_ADDED:
2224 show_file_mode_name("create", p->two);
2225 break;
2226 case DIFF_STATUS_COPIED:
2227 show_rename_copy("copy", p);
2228 break;
2229 case DIFF_STATUS_RENAMED:
2230 show_rename_copy("rename", p);
2231 break;
2232 default:
2233 if (p->score) {
2234 printf(" rewrite %s (%d%%)\n", p->two->path,
2235 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2236 show_mode_change(p, 0);
2237 } else show_mode_change(p, 1);
2238 break;
2239 }
2240 }
2241
2242 struct patch_id_t {
2243 struct xdiff_emit_state xm;
2244 SHA_CTX *ctx;
2245 int patchlen;
2246 };
2247
2248 static int remove_space(char *line, int len)
2249 {
2250 int i;
2251 char *dst = line;
2252 unsigned char c;
2253
2254 for (i = 0; i < len; i++)
2255 if (!isspace((c = line[i])))
2256 *dst++ = c;
2257
2258 return dst - line;
2259 }
2260
2261 static void patch_id_consume(void *priv, char *line, unsigned long len)
2262 {
2263 struct patch_id_t *data = priv;
2264 int new_len;
2265
2266 /* Ignore line numbers when computing the SHA1 of the patch */
2267 if (!strncmp(line, "@@ -", 4))
2268 return;
2269
2270 new_len = remove_space(line, len);
2271
2272 SHA1_Update(data->ctx, line, new_len);
2273 data->patchlen += new_len;
2274 }
2275
2276 /* returns 0 upon success, and writes result into sha1 */
2277 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2278 {
2279 struct diff_queue_struct *q = &diff_queued_diff;
2280 int i;
2281 SHA_CTX ctx;
2282 struct patch_id_t data;
2283 char buffer[PATH_MAX * 4 + 20];
2284
2285 SHA1_Init(&ctx);
2286 memset(&data, 0, sizeof(struct patch_id_t));
2287 data.ctx = &ctx;
2288 data.xm.consume = patch_id_consume;
2289
2290 for (i = 0; i < q->nr; i++) {
2291 xpparam_t xpp;
2292 xdemitconf_t xecfg;
2293 xdemitcb_t ecb;
2294 mmfile_t mf1, mf2;
2295 struct diff_filepair *p = q->queue[i];
2296 int len1, len2;
2297
2298 if (p->status == 0)
2299 return error("internal diff status error");
2300 if (p->status == DIFF_STATUS_UNKNOWN)
2301 continue;
2302 if (diff_unmodified_pair(p))
2303 continue;
2304 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2305 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2306 continue;
2307 if (DIFF_PAIR_UNMERGED(p))
2308 continue;
2309
2310 diff_fill_sha1_info(p->one);
2311 diff_fill_sha1_info(p->two);
2312 if (fill_mmfile(&mf1, p->one) < 0 ||
2313 fill_mmfile(&mf2, p->two) < 0)
2314 return error("unable to read files to diff");
2315
2316 /* Maybe hash p->two? into the patch id? */
2317 if (mmfile_is_binary(&mf2))
2318 continue;
2319
2320 len1 = remove_space(p->one->path, strlen(p->one->path));
2321 len2 = remove_space(p->two->path, strlen(p->two->path));
2322 if (p->one->mode == 0)
2323 len1 = snprintf(buffer, sizeof(buffer),
2324 "diff--gita/%.*sb/%.*s"
2325 "newfilemode%06o"
2326 "---/dev/null"
2327 "+++b/%.*s",
2328 len1, p->one->path,
2329 len2, p->two->path,
2330 p->two->mode,
2331 len2, p->two->path);
2332 else if (p->two->mode == 0)
2333 len1 = snprintf(buffer, sizeof(buffer),
2334 "diff--gita/%.*sb/%.*s"
2335 "deletedfilemode%06o"
2336 "---a/%.*s"
2337 "+++/dev/null",
2338 len1, p->one->path,
2339 len2, p->two->path,
2340 p->one->mode,
2341 len1, p->one->path);
2342 else
2343 len1 = snprintf(buffer, sizeof(buffer),
2344 "diff--gita/%.*sb/%.*s"
2345 "---a/%.*s"
2346 "+++b/%.*s",
2347 len1, p->one->path,
2348 len2, p->two->path,
2349 len1, p->one->path,
2350 len2, p->two->path);
2351 SHA1_Update(&ctx, buffer, len1);
2352
2353 xpp.flags = XDF_NEED_MINIMAL;
2354 xecfg.ctxlen = 3;
2355 xecfg.flags = XDL_EMIT_FUNCNAMES;
2356 ecb.outf = xdiff_outf;
2357 ecb.priv = &data;
2358 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2359 }
2360
2361 SHA1_Final(sha1, &ctx);
2362 return 0;
2363 }
2364
2365 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2366 {
2367 struct diff_queue_struct *q = &diff_queued_diff;
2368 int i;
2369 int result = diff_get_patch_id(options, sha1);
2370
2371 for (i = 0; i < q->nr; i++)
2372 diff_free_filepair(q->queue[i]);
2373
2374 free(q->queue);
2375 q->queue = NULL;
2376 q->nr = q->alloc = 0;
2377
2378 return result;
2379 }
2380
2381 static int is_summary_empty(const struct diff_queue_struct *q)
2382 {
2383 int i;
2384
2385 for (i = 0; i < q->nr; i++) {
2386 const struct diff_filepair *p = q->queue[i];
2387
2388 switch (p->status) {
2389 case DIFF_STATUS_DELETED:
2390 case DIFF_STATUS_ADDED:
2391 case DIFF_STATUS_COPIED:
2392 case DIFF_STATUS_RENAMED:
2393 return 0;
2394 default:
2395 if (p->score)
2396 return 0;
2397 if (p->one->mode && p->two->mode &&
2398 p->one->mode != p->two->mode)
2399 return 0;
2400 break;
2401 }
2402 }
2403 return 1;
2404 }
2405
2406 void diff_flush(struct diff_options *options)
2407 {
2408 struct diff_queue_struct *q = &diff_queued_diff;
2409 int i, output_format = options->output_format;
2410 int separator = 0;
2411
2412 /*
2413 * Order: raw, stat, summary, patch
2414 * or: name/name-status/checkdiff (other bits clear)
2415 */
2416 if (!q->nr)
2417 goto free_queue;
2418
2419 if (output_format & (DIFF_FORMAT_RAW |
2420 DIFF_FORMAT_NAME |
2421 DIFF_FORMAT_NAME_STATUS |
2422 DIFF_FORMAT_CHECKDIFF)) {
2423 for (i = 0; i < q->nr; i++) {
2424 struct diff_filepair *p = q->queue[i];
2425 if (check_pair_status(p))
2426 flush_one_pair(p, options);
2427 }
2428 separator++;
2429 }
2430
2431 if (output_format & DIFF_FORMAT_DIFFSTAT) {
2432 struct diffstat_t diffstat;
2433
2434 memset(&diffstat, 0, sizeof(struct diffstat_t));
2435 diffstat.xm.consume = diffstat_consume;
2436 for (i = 0; i < q->nr; i++) {
2437 struct diff_filepair *p = q->queue[i];
2438 if (check_pair_status(p))
2439 diff_flush_stat(p, options, &diffstat);
2440 }
2441 show_stats(&diffstat);
2442 separator++;
2443 }
2444
2445 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2446 for (i = 0; i < q->nr; i++)
2447 diff_summary(q->queue[i]);
2448 separator++;
2449 }
2450
2451 if (output_format & DIFF_FORMAT_PATCH) {
2452 if (separator) {
2453 if (options->stat_sep) {
2454 /* attach patch instead of inline */
2455 fputs(options->stat_sep, stdout);
2456 } else {
2457 putchar(options->line_termination);
2458 }
2459 }
2460
2461 for (i = 0; i < q->nr; i++) {
2462 struct diff_filepair *p = q->queue[i];
2463 if (check_pair_status(p))
2464 diff_flush_patch(p, options);
2465 }
2466 }
2467
2468 if (output_format & DIFF_FORMAT_CALLBACK)
2469 options->format_callback(q, options, options->format_callback_data);
2470
2471 for (i = 0; i < q->nr; i++)
2472 diff_free_filepair(q->queue[i]);
2473 free_queue:
2474 free(q->queue);
2475 q->queue = NULL;
2476 q->nr = q->alloc = 0;
2477 }
2478
2479 static void diffcore_apply_filter(const char *filter)
2480 {
2481 int i;
2482 struct diff_queue_struct *q = &diff_queued_diff;
2483 struct diff_queue_struct outq;
2484 outq.queue = NULL;
2485 outq.nr = outq.alloc = 0;
2486
2487 if (!filter)
2488 return;
2489
2490 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2491 int found;
2492 for (i = found = 0; !found && i < q->nr; i++) {
2493 struct diff_filepair *p = q->queue[i];
2494 if (((p->status == DIFF_STATUS_MODIFIED) &&
2495 ((p->score &&
2496 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2497 (!p->score &&
2498 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2499 ((p->status != DIFF_STATUS_MODIFIED) &&
2500 strchr(filter, p->status)))
2501 found++;
2502 }
2503 if (found)
2504 return;
2505
2506 /* otherwise we will clear the whole queue
2507 * by copying the empty outq at the end of this
2508 * function, but first clear the current entries
2509 * in the queue.
2510 */
2511 for (i = 0; i < q->nr; i++)
2512 diff_free_filepair(q->queue[i]);
2513 }
2514 else {
2515 /* Only the matching ones */
2516 for (i = 0; i < q->nr; i++) {
2517 struct diff_filepair *p = q->queue[i];
2518
2519 if (((p->status == DIFF_STATUS_MODIFIED) &&
2520 ((p->score &&
2521 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2522 (!p->score &&
2523 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2524 ((p->status != DIFF_STATUS_MODIFIED) &&
2525 strchr(filter, p->status)))
2526 diff_q(&outq, p);
2527 else
2528 diff_free_filepair(p);
2529 }
2530 }
2531 free(q->queue);
2532 *q = outq;
2533 }
2534
2535 void diffcore_std(struct diff_options *options)
2536 {
2537 if (options->break_opt != -1)
2538 diffcore_break(options->break_opt);
2539 if (options->detect_rename)
2540 diffcore_rename(options);
2541 if (options->break_opt != -1)
2542 diffcore_merge_broken();
2543 if (options->pickaxe)
2544 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2545 if (options->orderfile)
2546 diffcore_order(options->orderfile);
2547 diff_resolve_rename_copy();
2548 diffcore_apply_filter(options->filter);
2549 }
2550
2551
2552 void diffcore_std_no_resolve(struct diff_options *options)
2553 {
2554 if (options->pickaxe)
2555 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2556 if (options->orderfile)
2557 diffcore_order(options->orderfile);
2558 diffcore_apply_filter(options->filter);
2559 }
2560
2561 void diff_addremove(struct diff_options *options,
2562 int addremove, unsigned mode,
2563 const unsigned char *sha1,
2564 const char *base, const char *path)
2565 {
2566 char concatpath[PATH_MAX];
2567 struct diff_filespec *one, *two;
2568
2569 /* This may look odd, but it is a preparation for
2570 * feeding "there are unchanged files which should
2571 * not produce diffs, but when you are doing copy
2572 * detection you would need them, so here they are"
2573 * entries to the diff-core. They will be prefixed
2574 * with something like '=' or '*' (I haven't decided
2575 * which but should not make any difference).
2576 * Feeding the same new and old to diff_change()
2577 * also has the same effect.
2578 * Before the final output happens, they are pruned after
2579 * merged into rename/copy pairs as appropriate.
2580 */
2581 if (options->reverse_diff)
2582 addremove = (addremove == '+' ? '-' :
2583 addremove == '-' ? '+' : addremove);
2584
2585 if (!path) path = "";
2586 sprintf(concatpath, "%s%s", base, path);
2587 one = alloc_filespec(concatpath);
2588 two = alloc_filespec(concatpath);
2589
2590 if (addremove != '+')
2591 fill_filespec(one, sha1, mode);
2592 if (addremove != '-')
2593 fill_filespec(two, sha1, mode);
2594
2595 diff_queue(&diff_queued_diff, one, two);
2596 }
2597
2598 void diff_change(struct diff_options *options,
2599 unsigned old_mode, unsigned new_mode,
2600 const unsigned char *old_sha1,
2601 const unsigned char *new_sha1,
2602 const char *base, const char *path)
2603 {
2604 char concatpath[PATH_MAX];
2605 struct diff_filespec *one, *two;
2606
2607 if (options->reverse_diff) {
2608 unsigned tmp;
2609 const unsigned char *tmp_c;
2610 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
2611 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
2612 }
2613 if (!path) path = "";
2614 sprintf(concatpath, "%s%s", base, path);
2615 one = alloc_filespec(concatpath);
2616 two = alloc_filespec(concatpath);
2617 fill_filespec(one, old_sha1, old_mode);
2618 fill_filespec(two, new_sha1, new_mode);
2619
2620 diff_queue(&diff_queued_diff, one, two);
2621 }
2622
2623 void diff_unmerge(struct diff_options *options,
2624 const char *path)
2625 {
2626 struct diff_filespec *one, *two;
2627 one = alloc_filespec(path);
2628 two = alloc_filespec(path);
2629 diff_queue(&diff_queued_diff, one, two);
2630 }