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diff --stat: ensure at least one '-' for deletions, and one '+' for additions
[git/mingw.git] / diff.c
blob2df085f3c67afd96b5fcea5ade6f45c5e330198b
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 const char mime_boundary_leader[] = "------------";
549
550 static int scale_linear(int it, int width, int max_change)
551 {
552 /*
553 * make sure that at least one '-' is printed if there were deletions,
554 * and likewise for '+'.
555 */
556 if (max_change < 2)
557 return it;
558 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
559 }
560
561 static void show_name(const char *prefix, const char *name, int len,
562 const char *reset, const char *set)
563 {
564 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
565 }
566
567 static void show_graph(char ch, int cnt, const char *set, const char *reset)
568 {
569 if (cnt <= 0)
570 return;
571 printf("%s", set);
572 while (cnt--)
573 putchar(ch);
574 printf("%s", reset);
575 }
576
577 static void show_stats(struct diffstat_t* data, struct diff_options *options)
578 {
579 int i, len, add, del, total, adds = 0, dels = 0;
580 int max_change = 0, max_len = 0;
581 int total_files = data->nr;
582 int width, name_width;
583 const char *reset, *set, *add_c, *del_c;
584
585 if (data->nr == 0)
586 return;
587
588 width = options->stat_width ? options->stat_width : 80;
589 name_width = options->stat_name_width ? options->stat_name_width : 50;
590
591 /* Sanity: give at least 5 columns to the graph,
592 * but leave at least 10 columns for the name.
593 */
594 if (width < name_width + 15) {
595 if (name_width <= 25)
596 width = name_width + 15;
597 else
598 name_width = width - 15;
599 }
600
601 /* Find the longest filename and max number of changes */
602 reset = diff_get_color(options->color_diff, DIFF_RESET);
603 set = diff_get_color(options->color_diff, DIFF_PLAIN);
604 add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
605 del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
606
607 for (i = 0; i < data->nr; i++) {
608 struct diffstat_file *file = data->files[i];
609 int change = file->added + file->deleted;
610
611 len = quote_c_style(file->name, NULL, NULL, 0);
612 if (len) {
613 char *qname = xmalloc(len + 1);
614 quote_c_style(file->name, qname, NULL, 0);
615 free(file->name);
616 file->name = qname;
617 }
618
619 len = strlen(file->name);
620 if (max_len < len)
621 max_len = len;
622
623 if (file->is_binary || file->is_unmerged)
624 continue;
625 if (max_change < change)
626 max_change = change;
627 }
628
629 /* Compute the width of the graph part;
630 * 10 is for one blank at the beginning of the line plus
631 * " | count " between the name and the graph.
632 *
633 * From here on, name_width is the width of the name area,
634 * and width is the width of the graph area.
635 */
636 name_width = (name_width < max_len) ? name_width : max_len;
637 if (width < (name_width + 10) + max_change)
638 width = width - (name_width + 10);
639 else
640 width = max_change;
641
642 for (i = 0; i < data->nr; i++) {
643 const char *prefix = "";
644 char *name = data->files[i]->name;
645 int added = data->files[i]->added;
646 int deleted = data->files[i]->deleted;
647 int name_len;
648
649 /*
650 * "scale" the filename
651 */
652 len = name_width;
653 name_len = strlen(name);
654 if (name_width < name_len) {
655 char *slash;
656 prefix = "...";
657 len -= 3;
658 name += name_len - len;
659 slash = strchr(name, '/');
660 if (slash)
661 name = slash;
662 }
663
664 if (data->files[i]->is_binary) {
665 show_name(prefix, name, len, reset, set);
666 printf(" Bin\n");
667 goto free_diffstat_file;
668 }
669 else if (data->files[i]->is_unmerged) {
670 show_name(prefix, name, len, reset, set);
671 printf(" Unmerged\n");
672 goto free_diffstat_file;
673 }
674 else if (!data->files[i]->is_renamed &&
675 (added + deleted == 0)) {
676 total_files--;
677 goto free_diffstat_file;
678 }
679
680 /*
681 * scale the add/delete
682 */
683 add = added;
684 del = deleted;
685 total = add + del;
686 adds += add;
687 dels += del;
688
689 if (width <= max_change) {
690 add = scale_linear(add, width, max_change);
691 del = scale_linear(del, width, max_change);
692 total = add + del;
693 }
694 show_name(prefix, name, len, reset, set);
695 printf("%5d ", added + deleted);
696 show_graph('+', add, add_c, reset);
697 show_graph('-', del, del_c, reset);
698 putchar('\n');
699 free_diffstat_file:
700 free(data->files[i]->name);
701 free(data->files[i]);
702 }
703 free(data->files);
704 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
705 set, total_files, adds, dels, reset);
706 }
707
708 struct checkdiff_t {
709 struct xdiff_emit_state xm;
710 const char *filename;
711 int lineno;
712 };
713
714 static void checkdiff_consume(void *priv, char *line, unsigned long len)
715 {
716 struct checkdiff_t *data = priv;
717
718 if (line[0] == '+') {
719 int i, spaces = 0;
720
721 data->lineno++;
722
723 /* check space before tab */
724 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
725 if (line[i] == ' ')
726 spaces++;
727 if (line[i - 1] == '\t' && spaces)
728 printf("%s:%d: space before tab:%.*s\n",
729 data->filename, data->lineno, (int)len, line);
730
731 /* check white space at line end */
732 if (line[len - 1] == '\n')
733 len--;
734 if (isspace(line[len - 1]))
735 printf("%s:%d: white space at end: %.*s\n",
736 data->filename, data->lineno, (int)len, line);
737 } else if (line[0] == ' ')
738 data->lineno++;
739 else if (line[0] == '@') {
740 char *plus = strchr(line, '+');
741 if (plus)
742 data->lineno = strtol(plus, NULL, 10);
743 else
744 die("invalid diff");
745 }
746 }
747
748 static unsigned char *deflate_it(char *data,
749 unsigned long size,
750 unsigned long *result_size)
751 {
752 int bound;
753 unsigned char *deflated;
754 z_stream stream;
755
756 memset(&stream, 0, sizeof(stream));
757 deflateInit(&stream, zlib_compression_level);
758 bound = deflateBound(&stream, size);
759 deflated = xmalloc(bound);
760 stream.next_out = deflated;
761 stream.avail_out = bound;
762
763 stream.next_in = (unsigned char *)data;
764 stream.avail_in = size;
765 while (deflate(&stream, Z_FINISH) == Z_OK)
766 ; /* nothing */
767 deflateEnd(&stream);
768 *result_size = stream.total_out;
769 return deflated;
770 }
771
772 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
773 {
774 void *cp;
775 void *delta;
776 void *deflated;
777 void *data;
778 unsigned long orig_size;
779 unsigned long delta_size;
780 unsigned long deflate_size;
781 unsigned long data_size;
782
783 /* We could do deflated delta, or we could do just deflated two,
784 * whichever is smaller.
785 */
786 delta = NULL;
787 deflated = deflate_it(two->ptr, two->size, &deflate_size);
788 if (one->size && two->size) {
789 delta = diff_delta(one->ptr, one->size,
790 two->ptr, two->size,
791 &delta_size, deflate_size);
792 if (delta) {
793 void *to_free = delta;
794 orig_size = delta_size;
795 delta = deflate_it(delta, delta_size, &delta_size);
796 free(to_free);
797 }
798 }
799
800 if (delta && delta_size < deflate_size) {
801 printf("delta %lu\n", orig_size);
802 free(deflated);
803 data = delta;
804 data_size = delta_size;
805 }
806 else {
807 printf("literal %lu\n", two->size);
808 free(delta);
809 data = deflated;
810 data_size = deflate_size;
811 }
812
813 /* emit data encoded in base85 */
814 cp = data;
815 while (data_size) {
816 int bytes = (52 < data_size) ? 52 : data_size;
817 char line[70];
818 data_size -= bytes;
819 if (bytes <= 26)
820 line[0] = bytes + 'A' - 1;
821 else
822 line[0] = bytes - 26 + 'a' - 1;
823 encode_85(line + 1, cp, bytes);
824 cp = (char *) cp + bytes;
825 puts(line);
826 }
827 printf("\n");
828 free(data);
829 }
830
831 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
832 {
833 printf("GIT binary patch\n");
834 emit_binary_diff_body(one, two);
835 emit_binary_diff_body(two, one);
836 }
837
838 #define FIRST_FEW_BYTES 8000
839 static int mmfile_is_binary(mmfile_t *mf)
840 {
841 long sz = mf->size;
842 if (FIRST_FEW_BYTES < sz)
843 sz = FIRST_FEW_BYTES;
844 return !!memchr(mf->ptr, 0, sz);
845 }
846
847 static void builtin_diff(const char *name_a,
848 const char *name_b,
849 struct diff_filespec *one,
850 struct diff_filespec *two,
851 const char *xfrm_msg,
852 struct diff_options *o,
853 int complete_rewrite)
854 {
855 mmfile_t mf1, mf2;
856 const char *lbl[2];
857 char *a_one, *b_two;
858 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
859 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
860
861 a_one = quote_two("a/", name_a);
862 b_two = quote_two("b/", name_b);
863 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
864 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
865 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
866 if (lbl[0][0] == '/') {
867 /* /dev/null */
868 printf("%snew file mode %06o%s\n", set, two->mode, reset);
869 if (xfrm_msg && xfrm_msg[0])
870 printf("%s%s%s\n", set, xfrm_msg, reset);
871 }
872 else if (lbl[1][0] == '/') {
873 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
874 if (xfrm_msg && xfrm_msg[0])
875 printf("%s%s%s\n", set, xfrm_msg, reset);
876 }
877 else {
878 if (one->mode != two->mode) {
879 printf("%sold mode %06o%s\n", set, one->mode, reset);
880 printf("%snew mode %06o%s\n", set, two->mode, reset);
881 }
882 if (xfrm_msg && xfrm_msg[0])
883 printf("%s%s%s\n", set, xfrm_msg, reset);
884 /*
885 * we do not run diff between different kind
886 * of objects.
887 */
888 if ((one->mode ^ two->mode) & S_IFMT)
889 goto free_ab_and_return;
890 if (complete_rewrite) {
891 emit_rewrite_diff(name_a, name_b, one, two);
892 goto free_ab_and_return;
893 }
894 }
895
896 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
897 die("unable to read files to diff");
898
899 if (!o->text && (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))) {
900 /* Quite common confusing case */
901 if (mf1.size == mf2.size &&
902 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
903 goto free_ab_and_return;
904 if (o->binary)
905 emit_binary_diff(&mf1, &mf2);
906 else
907 printf("Binary files %s and %s differ\n",
908 lbl[0], lbl[1]);
909 }
910 else {
911 /* Crazy xdl interfaces.. */
912 const char *diffopts = getenv("GIT_DIFF_OPTS");
913 xpparam_t xpp;
914 xdemitconf_t xecfg;
915 xdemitcb_t ecb;
916 struct emit_callback ecbdata;
917
918 memset(&ecbdata, 0, sizeof(ecbdata));
919 ecbdata.label_path = lbl;
920 ecbdata.color_diff = o->color_diff;
921 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
922 xecfg.ctxlen = o->context;
923 xecfg.flags = XDL_EMIT_FUNCNAMES;
924 if (!diffopts)
925 ;
926 else if (!strncmp(diffopts, "--unified=", 10))
927 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
928 else if (!strncmp(diffopts, "-u", 2))
929 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
930 ecb.outf = xdiff_outf;
931 ecb.priv = &ecbdata;
932 ecbdata.xm.consume = fn_out_consume;
933 if (o->color_diff_words)
934 ecbdata.diff_words =
935 xcalloc(1, sizeof(struct diff_words_data));
936 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
937 if (o->color_diff_words)
938 free_diff_words_data(&ecbdata);
939 }
940
941 free_ab_and_return:
942 free(a_one);
943 free(b_two);
944 return;
945 }
946
947 static void builtin_diffstat(const char *name_a, const char *name_b,
948 struct diff_filespec *one,
949 struct diff_filespec *two,
950 struct diffstat_t *diffstat,
951 struct diff_options *o,
952 int complete_rewrite)
953 {
954 mmfile_t mf1, mf2;
955 struct diffstat_file *data;
956
957 data = diffstat_add(diffstat, name_a, name_b);
958
959 if (!one || !two) {
960 data->is_unmerged = 1;
961 return;
962 }
963 if (complete_rewrite) {
964 diff_populate_filespec(one, 0);
965 diff_populate_filespec(two, 0);
966 data->deleted = count_lines(one->data, one->size);
967 data->added = count_lines(two->data, two->size);
968 return;
969 }
970 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
971 die("unable to read files to diff");
972
973 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
974 data->is_binary = 1;
975 else {
976 /* Crazy xdl interfaces.. */
977 xpparam_t xpp;
978 xdemitconf_t xecfg;
979 xdemitcb_t ecb;
980
981 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
982 xecfg.ctxlen = 0;
983 xecfg.flags = 0;
984 ecb.outf = xdiff_outf;
985 ecb.priv = diffstat;
986 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
987 }
988 }
989
990 static void builtin_checkdiff(const char *name_a, const char *name_b,
991 struct diff_filespec *one,
992 struct diff_filespec *two)
993 {
994 mmfile_t mf1, mf2;
995 struct checkdiff_t data;
996
997 if (!two)
998 return;
999
1000 memset(&data, 0, sizeof(data));
1001 data.xm.consume = checkdiff_consume;
1002 data.filename = name_b ? name_b : name_a;
1003 data.lineno = 0;
1004
1005 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1006 die("unable to read files to diff");
1007
1008 if (mmfile_is_binary(&mf2))
1009 return;
1010 else {
1011 /* Crazy xdl interfaces.. */
1012 xpparam_t xpp;
1013 xdemitconf_t xecfg;
1014 xdemitcb_t ecb;
1015
1016 xpp.flags = XDF_NEED_MINIMAL;
1017 xecfg.ctxlen = 0;
1018 xecfg.flags = 0;
1019 ecb.outf = xdiff_outf;
1020 ecb.priv = &data;
1021 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1022 }
1023 }
1024
1025 struct diff_filespec *alloc_filespec(const char *path)
1026 {
1027 int namelen = strlen(path);
1028 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1029
1030 memset(spec, 0, sizeof(*spec));
1031 spec->path = (char *)(spec + 1);
1032 memcpy(spec->path, path, namelen+1);
1033 return spec;
1034 }
1035
1036 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1037 unsigned short mode)
1038 {
1039 if (mode) {
1040 spec->mode = canon_mode(mode);
1041 hashcpy(spec->sha1, sha1);
1042 spec->sha1_valid = !is_null_sha1(sha1);
1043 }
1044 }
1045
1046 /*
1047 * Given a name and sha1 pair, if the dircache tells us the file in
1048 * the work tree has that object contents, return true, so that
1049 * prepare_temp_file() does not have to inflate and extract.
1050 */
1051 static int work_tree_matches(const char *name, const unsigned char *sha1)
1052 {
1053 struct cache_entry *ce;
1054 struct stat st;
1055 int pos, len;
1056
1057 /* We do not read the cache ourselves here, because the
1058 * benchmark with my previous version that always reads cache
1059 * shows that it makes things worse for diff-tree comparing
1060 * two linux-2.6 kernel trees in an already checked out work
1061 * tree. This is because most diff-tree comparisons deal with
1062 * only a small number of files, while reading the cache is
1063 * expensive for a large project, and its cost outweighs the
1064 * savings we get by not inflating the object to a temporary
1065 * file. Practically, this code only helps when we are used
1066 * by diff-cache --cached, which does read the cache before
1067 * calling us.
1068 */
1069 if (!active_cache)
1070 return 0;
1071
1072 len = strlen(name);
1073 pos = cache_name_pos(name, len);
1074 if (pos < 0)
1075 return 0;
1076 ce = active_cache[pos];
1077 if ((lstat(name, &st) < 0) ||
1078 !S_ISREG(st.st_mode) || /* careful! */
1079 ce_match_stat(ce, &st, 0) ||
1080 hashcmp(sha1, ce->sha1))
1081 return 0;
1082 /* we return 1 only when we can stat, it is a regular file,
1083 * stat information matches, and sha1 recorded in the cache
1084 * matches. I.e. we know the file in the work tree really is
1085 * the same as the <name, sha1> pair.
1086 */
1087 return 1;
1088 }
1089
1090 static struct sha1_size_cache {
1091 unsigned char sha1[20];
1092 unsigned long size;
1093 } **sha1_size_cache;
1094 static int sha1_size_cache_nr, sha1_size_cache_alloc;
1095
1096 static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
1097 int find_only,
1098 unsigned long size)
1099 {
1100 int first, last;
1101 struct sha1_size_cache *e;
1102
1103 first = 0;
1104 last = sha1_size_cache_nr;
1105 while (last > first) {
1106 int cmp, next = (last + first) >> 1;
1107 e = sha1_size_cache[next];
1108 cmp = hashcmp(e->sha1, sha1);
1109 if (!cmp)
1110 return e;
1111 if (cmp < 0) {
1112 last = next;
1113 continue;
1114 }
1115 first = next+1;
1116 }
1117 /* not found */
1118 if (find_only)
1119 return NULL;
1120 /* insert to make it at "first" */
1121 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
1122 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
1123 sha1_size_cache = xrealloc(sha1_size_cache,
1124 sha1_size_cache_alloc *
1125 sizeof(*sha1_size_cache));
1126 }
1127 sha1_size_cache_nr++;
1128 if (first < sha1_size_cache_nr)
1129 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
1130 (sha1_size_cache_nr - first - 1) *
1131 sizeof(*sha1_size_cache));
1132 e = xmalloc(sizeof(struct sha1_size_cache));
1133 sha1_size_cache[first] = e;
1134 hashcpy(e->sha1, sha1);
1135 e->size = size;
1136 return e;
1137 }
1138
1139 /*
1140 * While doing rename detection and pickaxe operation, we may need to
1141 * grab the data for the blob (or file) for our own in-core comparison.
1142 * diff_filespec has data and size fields for this purpose.
1143 */
1144 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1145 {
1146 int err = 0;
1147 if (!DIFF_FILE_VALID(s))
1148 die("internal error: asking to populate invalid file.");
1149 if (S_ISDIR(s->mode))
1150 return -1;
1151
1152 if (!use_size_cache)
1153 size_only = 0;
1154
1155 if (s->data)
1156 return err;
1157 if (!s->sha1_valid ||
1158 work_tree_matches(s->path, s->sha1)) {
1159 struct stat st;
1160 int fd;
1161 if (lstat(s->path, &st) < 0) {
1162 if (errno == ENOENT) {
1163 err_empty:
1164 err = -1;
1165 empty:
1166 s->data = (char *)"";
1167 s->size = 0;
1168 return err;
1169 }
1170 }
1171 s->size = st.st_size;
1172 if (!s->size)
1173 goto empty;
1174 if (size_only)
1175 return 0;
1176 if (S_ISLNK(st.st_mode)) {
1177 int ret;
1178 s->data = xmalloc(s->size);
1179 s->should_free = 1;
1180 ret = readlink(s->path, s->data, s->size);
1181 if (ret < 0) {
1182 free(s->data);
1183 goto err_empty;
1184 }
1185 return 0;
1186 }
1187 fd = open(s->path, O_RDONLY);
1188 if (fd < 0)
1189 goto err_empty;
1190 s->data = mmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1191 close(fd);
1192 if (s->data == MAP_FAILED)
1193 goto err_empty;
1194 s->should_munmap = 1;
1195 }
1196 else {
1197 char type[20];
1198 struct sha1_size_cache *e;
1199
1200 if (size_only) {
1201 e = locate_size_cache(s->sha1, 1, 0);
1202 if (e) {
1203 s->size = e->size;
1204 return 0;
1205 }
1206 if (!sha1_object_info(s->sha1, type, &s->size))
1207 locate_size_cache(s->sha1, 0, s->size);
1208 }
1209 else {
1210 s->data = read_sha1_file(s->sha1, type, &s->size);
1211 s->should_free = 1;
1212 }
1213 }
1214 return 0;
1215 }
1216
1217 void diff_free_filespec_data(struct diff_filespec *s)
1218 {
1219 if (s->should_free)
1220 free(s->data);
1221 else if (s->should_munmap)
1222 munmap(s->data, s->size);
1223 s->should_free = s->should_munmap = 0;
1224 s->data = NULL;
1225 free(s->cnt_data);
1226 s->cnt_data = NULL;
1227 }
1228
1229 static void prep_temp_blob(struct diff_tempfile *temp,
1230 void *blob,
1231 unsigned long size,
1232 const unsigned char *sha1,
1233 int mode)
1234 {
1235 int fd;
1236
1237 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
1238 if (fd < 0)
1239 die("unable to create temp-file");
1240 if (write(fd, blob, size) != size)
1241 die("unable to write temp-file");
1242 close(fd);
1243 temp->name = temp->tmp_path;
1244 strcpy(temp->hex, sha1_to_hex(sha1));
1245 temp->hex[40] = 0;
1246 sprintf(temp->mode, "%06o", mode);
1247 }
1248
1249 static void prepare_temp_file(const char *name,
1250 struct diff_tempfile *temp,
1251 struct diff_filespec *one)
1252 {
1253 if (!DIFF_FILE_VALID(one)) {
1254 not_a_valid_file:
1255 /* A '-' entry produces this for file-2, and
1256 * a '+' entry produces this for file-1.
1257 */
1258 temp->name = "/dev/null";
1259 strcpy(temp->hex, ".");
1260 strcpy(temp->mode, ".");
1261 return;
1262 }
1263
1264 if (!one->sha1_valid ||
1265 work_tree_matches(name, one->sha1)) {
1266 struct stat st;
1267 if (lstat(name, &st) < 0) {
1268 if (errno == ENOENT)
1269 goto not_a_valid_file;
1270 die("stat(%s): %s", name, strerror(errno));
1271 }
1272 if (S_ISLNK(st.st_mode)) {
1273 int ret;
1274 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1275 if (sizeof(buf) <= st.st_size)
1276 die("symlink too long: %s", name);
1277 ret = readlink(name, buf, st.st_size);
1278 if (ret < 0)
1279 die("readlink(%s)", name);
1280 prep_temp_blob(temp, buf, st.st_size,
1281 (one->sha1_valid ?
1282 one->sha1 : null_sha1),
1283 (one->sha1_valid ?
1284 one->mode : S_IFLNK));
1285 }
1286 else {
1287 /* we can borrow from the file in the work tree */
1288 temp->name = name;
1289 if (!one->sha1_valid)
1290 strcpy(temp->hex, sha1_to_hex(null_sha1));
1291 else
1292 strcpy(temp->hex, sha1_to_hex(one->sha1));
1293 /* Even though we may sometimes borrow the
1294 * contents from the work tree, we always want
1295 * one->mode. mode is trustworthy even when
1296 * !(one->sha1_valid), as long as
1297 * DIFF_FILE_VALID(one).
1298 */
1299 sprintf(temp->mode, "%06o", one->mode);
1300 }
1301 return;
1302 }
1303 else {
1304 if (diff_populate_filespec(one, 0))
1305 die("cannot read data blob for %s", one->path);
1306 prep_temp_blob(temp, one->data, one->size,
1307 one->sha1, one->mode);
1308 }
1309 }
1310
1311 static void remove_tempfile(void)
1312 {
1313 int i;
1314
1315 for (i = 0; i < 2; i++)
1316 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1317 unlink(diff_temp[i].name);
1318 diff_temp[i].name = NULL;
1319 }
1320 }
1321
1322 static void remove_tempfile_on_signal(int signo)
1323 {
1324 remove_tempfile();
1325 signal(SIGINT, SIG_DFL);
1326 raise(signo);
1327 }
1328
1329 static int spawn_prog(const char *pgm, const char **arg)
1330 {
1331 pid_t pid;
1332 int status;
1333
1334 fflush(NULL);
1335 pid = fork();
1336 if (pid < 0)
1337 die("unable to fork");
1338 if (!pid) {
1339 execvp(pgm, (char *const*) arg);
1340 exit(255);
1341 }
1342
1343 while (waitpid(pid, &status, 0) < 0) {
1344 if (errno == EINTR)
1345 continue;
1346 return -1;
1347 }
1348
1349 /* Earlier we did not check the exit status because
1350 * diff exits non-zero if files are different, and
1351 * we are not interested in knowing that. It was a
1352 * mistake which made it harder to quit a diff-*
1353 * session that uses the git-apply-patch-script as
1354 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1355 * should also exit non-zero only when it wants to
1356 * abort the entire diff-* session.
1357 */
1358 if (WIFEXITED(status) && !WEXITSTATUS(status))
1359 return 0;
1360 return -1;
1361 }
1362
1363 /* An external diff command takes:
1364 *
1365 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1366 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1367 *
1368 */
1369 static void run_external_diff(const char *pgm,
1370 const char *name,
1371 const char *other,
1372 struct diff_filespec *one,
1373 struct diff_filespec *two,
1374 const char *xfrm_msg,
1375 int complete_rewrite)
1376 {
1377 const char *spawn_arg[10];
1378 struct diff_tempfile *temp = diff_temp;
1379 int retval;
1380 static int atexit_asked = 0;
1381 const char *othername;
1382 const char **arg = &spawn_arg[0];
1383
1384 othername = (other? other : name);
1385 if (one && two) {
1386 prepare_temp_file(name, &temp[0], one);
1387 prepare_temp_file(othername, &temp[1], two);
1388 if (! atexit_asked &&
1389 (temp[0].name == temp[0].tmp_path ||
1390 temp[1].name == temp[1].tmp_path)) {
1391 atexit_asked = 1;
1392 atexit(remove_tempfile);
1393 }
1394 signal(SIGINT, remove_tempfile_on_signal);
1395 }
1396
1397 if (one && two) {
1398 *arg++ = pgm;
1399 *arg++ = name;
1400 *arg++ = temp[0].name;
1401 *arg++ = temp[0].hex;
1402 *arg++ = temp[0].mode;
1403 *arg++ = temp[1].name;
1404 *arg++ = temp[1].hex;
1405 *arg++ = temp[1].mode;
1406 if (other) {
1407 *arg++ = other;
1408 *arg++ = xfrm_msg;
1409 }
1410 } else {
1411 *arg++ = pgm;
1412 *arg++ = name;
1413 }
1414 *arg = NULL;
1415 retval = spawn_prog(pgm, spawn_arg);
1416 remove_tempfile();
1417 if (retval) {
1418 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1419 exit(1);
1420 }
1421 }
1422
1423 static void run_diff_cmd(const char *pgm,
1424 const char *name,
1425 const char *other,
1426 struct diff_filespec *one,
1427 struct diff_filespec *two,
1428 const char *xfrm_msg,
1429 struct diff_options *o,
1430 int complete_rewrite)
1431 {
1432 if (pgm) {
1433 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1434 complete_rewrite);
1435 return;
1436 }
1437 if (one && two)
1438 builtin_diff(name, other ? other : name,
1439 one, two, xfrm_msg, o, complete_rewrite);
1440 else
1441 printf("* Unmerged path %s\n", name);
1442 }
1443
1444 static void diff_fill_sha1_info(struct diff_filespec *one)
1445 {
1446 if (DIFF_FILE_VALID(one)) {
1447 if (!one->sha1_valid) {
1448 struct stat st;
1449 if (lstat(one->path, &st) < 0)
1450 die("stat %s", one->path);
1451 if (index_path(one->sha1, one->path, &st, 0))
1452 die("cannot hash %s\n", one->path);
1453 }
1454 }
1455 else
1456 hashclr(one->sha1);
1457 }
1458
1459 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1460 {
1461 const char *pgm = external_diff();
1462 char msg[PATH_MAX*2+300], *xfrm_msg;
1463 struct diff_filespec *one;
1464 struct diff_filespec *two;
1465 const char *name;
1466 const char *other;
1467 char *name_munged, *other_munged;
1468 int complete_rewrite = 0;
1469 int len;
1470
1471 if (DIFF_PAIR_UNMERGED(p)) {
1472 /* unmerged */
1473 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1474 return;
1475 }
1476
1477 name = p->one->path;
1478 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1479 name_munged = quote_one(name);
1480 other_munged = quote_one(other);
1481 one = p->one; two = p->two;
1482
1483 diff_fill_sha1_info(one);
1484 diff_fill_sha1_info(two);
1485
1486 len = 0;
1487 switch (p->status) {
1488 case DIFF_STATUS_COPIED:
1489 len += snprintf(msg + len, sizeof(msg) - len,
1490 "similarity index %d%%\n"
1491 "copy from %s\n"
1492 "copy to %s\n",
1493 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1494 name_munged, other_munged);
1495 break;
1496 case DIFF_STATUS_RENAMED:
1497 len += snprintf(msg + len, sizeof(msg) - len,
1498 "similarity index %d%%\n"
1499 "rename from %s\n"
1500 "rename to %s\n",
1501 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1502 name_munged, other_munged);
1503 break;
1504 case DIFF_STATUS_MODIFIED:
1505 if (p->score) {
1506 len += snprintf(msg + len, sizeof(msg) - len,
1507 "dissimilarity index %d%%\n",
1508 (int)(0.5 + p->score *
1509 100.0/MAX_SCORE));
1510 complete_rewrite = 1;
1511 break;
1512 }
1513 /* fallthru */
1514 default:
1515 /* nothing */
1516 ;
1517 }
1518
1519 if (hashcmp(one->sha1, two->sha1)) {
1520 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1521
1522 if (o->binary) {
1523 mmfile_t mf;
1524 if ((!fill_mmfile(&mf, one) && mmfile_is_binary(&mf)) ||
1525 (!fill_mmfile(&mf, two) && mmfile_is_binary(&mf)))
1526 abbrev = 40;
1527 }
1528 len += snprintf(msg + len, sizeof(msg) - len,
1529 "index %.*s..%.*s",
1530 abbrev, sha1_to_hex(one->sha1),
1531 abbrev, sha1_to_hex(two->sha1));
1532 if (one->mode == two->mode)
1533 len += snprintf(msg + len, sizeof(msg) - len,
1534 " %06o", one->mode);
1535 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1536 }
1537
1538 if (len)
1539 msg[--len] = 0;
1540 xfrm_msg = len ? msg : NULL;
1541
1542 if (!pgm &&
1543 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1544 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1545 /* a filepair that changes between file and symlink
1546 * needs to be split into deletion and creation.
1547 */
1548 struct diff_filespec *null = alloc_filespec(two->path);
1549 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1550 free(null);
1551 null = alloc_filespec(one->path);
1552 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1553 free(null);
1554 }
1555 else
1556 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1557 complete_rewrite);
1558
1559 free(name_munged);
1560 free(other_munged);
1561 }
1562
1563 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1564 struct diffstat_t *diffstat)
1565 {
1566 const char *name;
1567 const char *other;
1568 int complete_rewrite = 0;
1569
1570 if (DIFF_PAIR_UNMERGED(p)) {
1571 /* unmerged */
1572 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1573 return;
1574 }
1575
1576 name = p->one->path;
1577 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1578
1579 diff_fill_sha1_info(p->one);
1580 diff_fill_sha1_info(p->two);
1581
1582 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1583 complete_rewrite = 1;
1584 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
1585 }
1586
1587 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1588 {
1589 const char *name;
1590 const char *other;
1591
1592 if (DIFF_PAIR_UNMERGED(p)) {
1593 /* unmerged */
1594 return;
1595 }
1596
1597 name = p->one->path;
1598 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1599
1600 diff_fill_sha1_info(p->one);
1601 diff_fill_sha1_info(p->two);
1602
1603 builtin_checkdiff(name, other, p->one, p->two);
1604 }
1605
1606 void diff_setup(struct diff_options *options)
1607 {
1608 memset(options, 0, sizeof(*options));
1609 options->line_termination = '\n';
1610 options->break_opt = -1;
1611 options->rename_limit = -1;
1612 options->context = 3;
1613 options->msg_sep = "";
1614
1615 options->change = diff_change;
1616 options->add_remove = diff_addremove;
1617 options->color_diff = diff_use_color_default;
1618 options->detect_rename = diff_detect_rename_default;
1619 }
1620
1621 int diff_setup_done(struct diff_options *options)
1622 {
1623 int count = 0;
1624
1625 if (options->output_format & DIFF_FORMAT_NAME)
1626 count++;
1627 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
1628 count++;
1629 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
1630 count++;
1631 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
1632 count++;
1633 if (count > 1)
1634 die("--name-only, --name-status, --check and -s are mutually exclusive");
1635
1636 if (options->find_copies_harder)
1637 options->detect_rename = DIFF_DETECT_COPY;
1638
1639 if (options->output_format & (DIFF_FORMAT_NAME |
1640 DIFF_FORMAT_NAME_STATUS |
1641 DIFF_FORMAT_CHECKDIFF |
1642 DIFF_FORMAT_NO_OUTPUT))
1643 options->output_format &= ~(DIFF_FORMAT_RAW |
1644 DIFF_FORMAT_DIFFSTAT |
1645 DIFF_FORMAT_SUMMARY |
1646 DIFF_FORMAT_PATCH);
1647
1648 /*
1649 * These cases always need recursive; we do not drop caller-supplied
1650 * recursive bits for other formats here.
1651 */
1652 if (options->output_format & (DIFF_FORMAT_PATCH |
1653 DIFF_FORMAT_DIFFSTAT |
1654 DIFF_FORMAT_CHECKDIFF))
1655 options->recursive = 1;
1656 /*
1657 * Also pickaxe would not work very well if you do not say recursive
1658 */
1659 if (options->pickaxe)
1660 options->recursive = 1;
1661
1662 if (options->detect_rename && options->rename_limit < 0)
1663 options->rename_limit = diff_rename_limit_default;
1664 if (options->setup & DIFF_SETUP_USE_CACHE) {
1665 if (!active_cache)
1666 /* read-cache does not die even when it fails
1667 * so it is safe for us to do this here. Also
1668 * it does not smudge active_cache or active_nr
1669 * when it fails, so we do not have to worry about
1670 * cleaning it up ourselves either.
1671 */
1672 read_cache();
1673 }
1674 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
1675 use_size_cache = 1;
1676 if (options->abbrev <= 0 || 40 < options->abbrev)
1677 options->abbrev = 40; /* full */
1678
1679 return 0;
1680 }
1681
1682 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
1683 {
1684 char c, *eq;
1685 int len;
1686
1687 if (*arg != '-')
1688 return 0;
1689 c = *++arg;
1690 if (!c)
1691 return 0;
1692 if (c == arg_short) {
1693 c = *++arg;
1694 if (!c)
1695 return 1;
1696 if (val && isdigit(c)) {
1697 char *end;
1698 int n = strtoul(arg, &end, 10);
1699 if (*end)
1700 return 0;
1701 *val = n;
1702 return 1;
1703 }
1704 return 0;
1705 }
1706 if (c != '-')
1707 return 0;
1708 arg++;
1709 eq = strchr(arg, '=');
1710 if (eq)
1711 len = eq - arg;
1712 else
1713 len = strlen(arg);
1714 if (!len || strncmp(arg, arg_long, len))
1715 return 0;
1716 if (eq) {
1717 int n;
1718 char *end;
1719 if (!isdigit(*++eq))
1720 return 0;
1721 n = strtoul(eq, &end, 10);
1722 if (*end)
1723 return 0;
1724 *val = n;
1725 }
1726 return 1;
1727 }
1728
1729 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
1730 {
1731 const char *arg = av[0];
1732 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
1733 options->output_format |= DIFF_FORMAT_PATCH;
1734 else if (opt_arg(arg, 'U', "unified", &options->context))
1735 options->output_format |= DIFF_FORMAT_PATCH;
1736 else if (!strcmp(arg, "--raw"))
1737 options->output_format |= DIFF_FORMAT_RAW;
1738 else if (!strcmp(arg, "--patch-with-raw")) {
1739 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
1740 }
1741 else if (!strncmp(arg, "--stat", 6)) {
1742 char *end;
1743 int width = options->stat_width;
1744 int name_width = options->stat_name_width;
1745 arg += 6;
1746 end = (char *)arg;
1747
1748 switch (*arg) {
1749 case '-':
1750 if (!strncmp(arg, "-width=", 7))
1751 width = strtoul(arg + 7, &end, 10);
1752 else if (!strncmp(arg, "-name-width=", 12))
1753 name_width = strtoul(arg + 12, &end, 10);
1754 break;
1755 case '=':
1756 width = strtoul(arg+1, &end, 10);
1757 if (*end == ',')
1758 name_width = strtoul(end+1, &end, 10);
1759 }
1760
1761 /* Important! This checks all the error cases! */
1762 if (*end)
1763 return 0;
1764 options->output_format |= DIFF_FORMAT_DIFFSTAT;
1765 options->stat_name_width = name_width;
1766 options->stat_width = width;
1767 }
1768 else if (!strcmp(arg, "--check"))
1769 options->output_format |= DIFF_FORMAT_CHECKDIFF;
1770 else if (!strcmp(arg, "--summary"))
1771 options->output_format |= DIFF_FORMAT_SUMMARY;
1772 else if (!strcmp(arg, "--patch-with-stat")) {
1773 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
1774 }
1775 else if (!strcmp(arg, "-z"))
1776 options->line_termination = 0;
1777 else if (!strncmp(arg, "-l", 2))
1778 options->rename_limit = strtoul(arg+2, NULL, 10);
1779 else if (!strcmp(arg, "--full-index"))
1780 options->full_index = 1;
1781 else if (!strcmp(arg, "--binary")) {
1782 options->output_format |= DIFF_FORMAT_PATCH;
1783 options->binary = 1;
1784 }
1785 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
1786 options->text = 1;
1787 }
1788 else if (!strcmp(arg, "--name-only"))
1789 options->output_format |= DIFF_FORMAT_NAME;
1790 else if (!strcmp(arg, "--name-status"))
1791 options->output_format |= DIFF_FORMAT_NAME_STATUS;
1792 else if (!strcmp(arg, "-R"))
1793 options->reverse_diff = 1;
1794 else if (!strncmp(arg, "-S", 2))
1795 options->pickaxe = arg + 2;
1796 else if (!strcmp(arg, "-s")) {
1797 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
1798 }
1799 else if (!strncmp(arg, "-O", 2))
1800 options->orderfile = arg + 2;
1801 else if (!strncmp(arg, "--diff-filter=", 14))
1802 options->filter = arg + 14;
1803 else if (!strcmp(arg, "--pickaxe-all"))
1804 options->pickaxe_opts = DIFF_PICKAXE_ALL;
1805 else if (!strcmp(arg, "--pickaxe-regex"))
1806 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
1807 else if (!strncmp(arg, "-B", 2)) {
1808 if ((options->break_opt =
1809 diff_scoreopt_parse(arg)) == -1)
1810 return -1;
1811 }
1812 else if (!strncmp(arg, "-M", 2)) {
1813 if ((options->rename_score =
1814 diff_scoreopt_parse(arg)) == -1)
1815 return -1;
1816 options->detect_rename = DIFF_DETECT_RENAME;
1817 }
1818 else if (!strncmp(arg, "-C", 2)) {
1819 if ((options->rename_score =
1820 diff_scoreopt_parse(arg)) == -1)
1821 return -1;
1822 options->detect_rename = DIFF_DETECT_COPY;
1823 }
1824 else if (!strcmp(arg, "--find-copies-harder"))
1825 options->find_copies_harder = 1;
1826 else if (!strcmp(arg, "--abbrev"))
1827 options->abbrev = DEFAULT_ABBREV;
1828 else if (!strncmp(arg, "--abbrev=", 9)) {
1829 options->abbrev = strtoul(arg + 9, NULL, 10);
1830 if (options->abbrev < MINIMUM_ABBREV)
1831 options->abbrev = MINIMUM_ABBREV;
1832 else if (40 < options->abbrev)
1833 options->abbrev = 40;
1834 }
1835 else if (!strcmp(arg, "--color"))
1836 options->color_diff = 1;
1837 else if (!strcmp(arg, "--no-color"))
1838 options->color_diff = 0;
1839 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
1840 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
1841 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
1842 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
1843 else if (!strcmp(arg, "--color-words"))
1844 options->color_diff = options->color_diff_words = 1;
1845 else if (!strcmp(arg, "--no-renames"))
1846 options->detect_rename = 0;
1847 else
1848 return 0;
1849 return 1;
1850 }
1851
1852 static int parse_num(const char **cp_p)
1853 {
1854 unsigned long num, scale;
1855 int ch, dot;
1856 const char *cp = *cp_p;
1857
1858 num = 0;
1859 scale = 1;
1860 dot = 0;
1861 for(;;) {
1862 ch = *cp;
1863 if ( !dot && ch == '.' ) {
1864 scale = 1;
1865 dot = 1;
1866 } else if ( ch == '%' ) {
1867 scale = dot ? scale*100 : 100;
1868 cp++; /* % is always at the end */
1869 break;
1870 } else if ( ch >= '0' && ch <= '9' ) {
1871 if ( scale < 100000 ) {
1872 scale *= 10;
1873 num = (num*10) + (ch-'0');
1874 }
1875 } else {
1876 break;
1877 }
1878 cp++;
1879 }
1880 *cp_p = cp;
1881
1882 /* user says num divided by scale and we say internally that
1883 * is MAX_SCORE * num / scale.
1884 */
1885 return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
1886 }
1887
1888 int diff_scoreopt_parse(const char *opt)
1889 {
1890 int opt1, opt2, cmd;
1891
1892 if (*opt++ != '-')
1893 return -1;
1894 cmd = *opt++;
1895 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
1896 return -1; /* that is not a -M, -C nor -B option */
1897
1898 opt1 = parse_num(&opt);
1899 if (cmd != 'B')
1900 opt2 = 0;
1901 else {
1902 if (*opt == 0)
1903 opt2 = 0;
1904 else if (*opt != '/')
1905 return -1; /* we expect -B80/99 or -B80 */
1906 else {
1907 opt++;
1908 opt2 = parse_num(&opt);
1909 }
1910 }
1911 if (*opt != 0)
1912 return -1;
1913 return opt1 | (opt2 << 16);
1914 }
1915
1916 struct diff_queue_struct diff_queued_diff;
1917
1918 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
1919 {
1920 if (queue->alloc <= queue->nr) {
1921 queue->alloc = alloc_nr(queue->alloc);
1922 queue->queue = xrealloc(queue->queue,
1923 sizeof(dp) * queue->alloc);
1924 }
1925 queue->queue[queue->nr++] = dp;
1926 }
1927
1928 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
1929 struct diff_filespec *one,
1930 struct diff_filespec *two)
1931 {
1932 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
1933 dp->one = one;
1934 dp->two = two;
1935 if (queue)
1936 diff_q(queue, dp);
1937 return dp;
1938 }
1939
1940 void diff_free_filepair(struct diff_filepair *p)
1941 {
1942 diff_free_filespec_data(p->one);
1943 diff_free_filespec_data(p->two);
1944 free(p->one);
1945 free(p->two);
1946 free(p);
1947 }
1948
1949 /* This is different from find_unique_abbrev() in that
1950 * it stuffs the result with dots for alignment.
1951 */
1952 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
1953 {
1954 int abblen;
1955 const char *abbrev;
1956 if (len == 40)
1957 return sha1_to_hex(sha1);
1958
1959 abbrev = find_unique_abbrev(sha1, len);
1960 if (!abbrev)
1961 return sha1_to_hex(sha1);
1962 abblen = strlen(abbrev);
1963 if (abblen < 37) {
1964 static char hex[41];
1965 if (len < abblen && abblen <= len + 2)
1966 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
1967 else
1968 sprintf(hex, "%s...", abbrev);
1969 return hex;
1970 }
1971 return sha1_to_hex(sha1);
1972 }
1973
1974 static void diff_flush_raw(struct diff_filepair *p,
1975 struct diff_options *options)
1976 {
1977 int two_paths;
1978 char status[10];
1979 int abbrev = options->abbrev;
1980 const char *path_one, *path_two;
1981 int inter_name_termination = '\t';
1982 int line_termination = options->line_termination;
1983
1984 if (!line_termination)
1985 inter_name_termination = 0;
1986
1987 path_one = p->one->path;
1988 path_two = p->two->path;
1989 if (line_termination) {
1990 path_one = quote_one(path_one);
1991 path_two = quote_one(path_two);
1992 }
1993
1994 if (p->score)
1995 sprintf(status, "%c%03d", p->status,
1996 (int)(0.5 + p->score * 100.0/MAX_SCORE));
1997 else {
1998 status[0] = p->status;
1999 status[1] = 0;
2000 }
2001 switch (p->status) {
2002 case DIFF_STATUS_COPIED:
2003 case DIFF_STATUS_RENAMED:
2004 two_paths = 1;
2005 break;
2006 case DIFF_STATUS_ADDED:
2007 case DIFF_STATUS_DELETED:
2008 two_paths = 0;
2009 break;
2010 default:
2011 two_paths = 0;
2012 break;
2013 }
2014 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
2015 printf(":%06o %06o %s ",
2016 p->one->mode, p->two->mode,
2017 diff_unique_abbrev(p->one->sha1, abbrev));
2018 printf("%s ",
2019 diff_unique_abbrev(p->two->sha1, abbrev));
2020 }
2021 printf("%s%c%s", status, inter_name_termination, path_one);
2022 if (two_paths)
2023 printf("%c%s", inter_name_termination, path_two);
2024 putchar(line_termination);
2025 if (path_one != p->one->path)
2026 free((void*)path_one);
2027 if (path_two != p->two->path)
2028 free((void*)path_two);
2029 }
2030
2031 static void diff_flush_name(struct diff_filepair *p, int line_termination)
2032 {
2033 char *path = p->two->path;
2034
2035 if (line_termination)
2036 path = quote_one(p->two->path);
2037 printf("%s%c", path, line_termination);
2038 if (p->two->path != path)
2039 free(path);
2040 }
2041
2042 int diff_unmodified_pair(struct diff_filepair *p)
2043 {
2044 /* This function is written stricter than necessary to support
2045 * the currently implemented transformers, but the idea is to
2046 * let transformers to produce diff_filepairs any way they want,
2047 * and filter and clean them up here before producing the output.
2048 */
2049 struct diff_filespec *one, *two;
2050
2051 if (DIFF_PAIR_UNMERGED(p))
2052 return 0; /* unmerged is interesting */
2053
2054 one = p->one;
2055 two = p->two;
2056
2057 /* deletion, addition, mode or type change
2058 * and rename are all interesting.
2059 */
2060 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2061 DIFF_PAIR_MODE_CHANGED(p) ||
2062 strcmp(one->path, two->path))
2063 return 0;
2064
2065 /* both are valid and point at the same path. that is, we are
2066 * dealing with a change.
2067 */
2068 if (one->sha1_valid && two->sha1_valid &&
2069 !hashcmp(one->sha1, two->sha1))
2070 return 1; /* no change */
2071 if (!one->sha1_valid && !two->sha1_valid)
2072 return 1; /* both look at the same file on the filesystem. */
2073 return 0;
2074 }
2075
2076 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2077 {
2078 if (diff_unmodified_pair(p))
2079 return;
2080
2081 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2082 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2083 return; /* no tree diffs in patch format */
2084
2085 run_diff(p, o);
2086 }
2087
2088 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2089 struct diffstat_t *diffstat)
2090 {
2091 if (diff_unmodified_pair(p))
2092 return;
2093
2094 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2095 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2096 return; /* no tree diffs in patch format */
2097
2098 run_diffstat(p, o, diffstat);
2099 }
2100
2101 static void diff_flush_checkdiff(struct diff_filepair *p,
2102 struct diff_options *o)
2103 {
2104 if (diff_unmodified_pair(p))
2105 return;
2106
2107 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2108 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2109 return; /* no tree diffs in patch format */
2110
2111 run_checkdiff(p, o);
2112 }
2113
2114 int diff_queue_is_empty(void)
2115 {
2116 struct diff_queue_struct *q = &diff_queued_diff;
2117 int i;
2118 for (i = 0; i < q->nr; i++)
2119 if (!diff_unmodified_pair(q->queue[i]))
2120 return 0;
2121 return 1;
2122 }
2123
2124 #if DIFF_DEBUG
2125 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2126 {
2127 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2128 x, one ? one : "",
2129 s->path,
2130 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2131 s->mode,
2132 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2133 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2134 x, one ? one : "",
2135 s->size, s->xfrm_flags);
2136 }
2137
2138 void diff_debug_filepair(const struct diff_filepair *p, int i)
2139 {
2140 diff_debug_filespec(p->one, i, "one");
2141 diff_debug_filespec(p->two, i, "two");
2142 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2143 p->score, p->status ? p->status : '?',
2144 p->source_stays, p->broken_pair);
2145 }
2146
2147 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2148 {
2149 int i;
2150 if (msg)
2151 fprintf(stderr, "%s\n", msg);
2152 fprintf(stderr, "q->nr = %d\n", q->nr);
2153 for (i = 0; i < q->nr; i++) {
2154 struct diff_filepair *p = q->queue[i];
2155 diff_debug_filepair(p, i);
2156 }
2157 }
2158 #endif
2159
2160 static void diff_resolve_rename_copy(void)
2161 {
2162 int i, j;
2163 struct diff_filepair *p, *pp;
2164 struct diff_queue_struct *q = &diff_queued_diff;
2165
2166 diff_debug_queue("resolve-rename-copy", q);
2167
2168 for (i = 0; i < q->nr; i++) {
2169 p = q->queue[i];
2170 p->status = 0; /* undecided */
2171 if (DIFF_PAIR_UNMERGED(p))
2172 p->status = DIFF_STATUS_UNMERGED;
2173 else if (!DIFF_FILE_VALID(p->one))
2174 p->status = DIFF_STATUS_ADDED;
2175 else if (!DIFF_FILE_VALID(p->two))
2176 p->status = DIFF_STATUS_DELETED;
2177 else if (DIFF_PAIR_TYPE_CHANGED(p))
2178 p->status = DIFF_STATUS_TYPE_CHANGED;
2179
2180 /* from this point on, we are dealing with a pair
2181 * whose both sides are valid and of the same type, i.e.
2182 * either in-place edit or rename/copy edit.
2183 */
2184 else if (DIFF_PAIR_RENAME(p)) {
2185 if (p->source_stays) {
2186 p->status = DIFF_STATUS_COPIED;
2187 continue;
2188 }
2189 /* See if there is some other filepair that
2190 * copies from the same source as us. If so
2191 * we are a copy. Otherwise we are either a
2192 * copy if the path stays, or a rename if it
2193 * does not, but we already handled "stays" case.
2194 */
2195 for (j = i + 1; j < q->nr; j++) {
2196 pp = q->queue[j];
2197 if (strcmp(pp->one->path, p->one->path))
2198 continue; /* not us */
2199 if (!DIFF_PAIR_RENAME(pp))
2200 continue; /* not a rename/copy */
2201 /* pp is a rename/copy from the same source */
2202 p->status = DIFF_STATUS_COPIED;
2203 break;
2204 }
2205 if (!p->status)
2206 p->status = DIFF_STATUS_RENAMED;
2207 }
2208 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2209 p->one->mode != p->two->mode)
2210 p->status = DIFF_STATUS_MODIFIED;
2211 else {
2212 /* This is a "no-change" entry and should not
2213 * happen anymore, but prepare for broken callers.
2214 */
2215 error("feeding unmodified %s to diffcore",
2216 p->one->path);
2217 p->status = DIFF_STATUS_UNKNOWN;
2218 }
2219 }
2220 diff_debug_queue("resolve-rename-copy done", q);
2221 }
2222
2223 static int check_pair_status(struct diff_filepair *p)
2224 {
2225 switch (p->status) {
2226 case DIFF_STATUS_UNKNOWN:
2227 return 0;
2228 case 0:
2229 die("internal error in diff-resolve-rename-copy");
2230 default:
2231 return 1;
2232 }
2233 }
2234
2235 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2236 {
2237 int fmt = opt->output_format;
2238
2239 if (fmt & DIFF_FORMAT_CHECKDIFF)
2240 diff_flush_checkdiff(p, opt);
2241 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2242 diff_flush_raw(p, opt);
2243 else if (fmt & DIFF_FORMAT_NAME)
2244 diff_flush_name(p, opt->line_termination);
2245 }
2246
2247 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2248 {
2249 if (fs->mode)
2250 printf(" %s mode %06o %s\n", newdelete, fs->mode, fs->path);
2251 else
2252 printf(" %s %s\n", newdelete, fs->path);
2253 }
2254
2255
2256 static void show_mode_change(struct diff_filepair *p, int show_name)
2257 {
2258 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2259 if (show_name)
2260 printf(" mode change %06o => %06o %s\n",
2261 p->one->mode, p->two->mode, p->two->path);
2262 else
2263 printf(" mode change %06o => %06o\n",
2264 p->one->mode, p->two->mode);
2265 }
2266 }
2267
2268 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2269 {
2270 const char *old, *new;
2271
2272 /* Find common prefix */
2273 old = p->one->path;
2274 new = p->two->path;
2275 while (1) {
2276 const char *slash_old, *slash_new;
2277 slash_old = strchr(old, '/');
2278 slash_new = strchr(new, '/');
2279 if (!slash_old ||
2280 !slash_new ||
2281 slash_old - old != slash_new - new ||
2282 memcmp(old, new, slash_new - new))
2283 break;
2284 old = slash_old + 1;
2285 new = slash_new + 1;
2286 }
2287 /* p->one->path thru old is the common prefix, and old and new
2288 * through the end of names are renames
2289 */
2290 if (old != p->one->path)
2291 printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
2292 (int)(old - p->one->path), p->one->path,
2293 old, new, (int)(0.5 + p->score * 100.0/MAX_SCORE));
2294 else
2295 printf(" %s %s => %s (%d%%)\n", renamecopy,
2296 p->one->path, p->two->path,
2297 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2298 show_mode_change(p, 0);
2299 }
2300
2301 static void diff_summary(struct diff_filepair *p)
2302 {
2303 switch(p->status) {
2304 case DIFF_STATUS_DELETED:
2305 show_file_mode_name("delete", p->one);
2306 break;
2307 case DIFF_STATUS_ADDED:
2308 show_file_mode_name("create", p->two);
2309 break;
2310 case DIFF_STATUS_COPIED:
2311 show_rename_copy("copy", p);
2312 break;
2313 case DIFF_STATUS_RENAMED:
2314 show_rename_copy("rename", p);
2315 break;
2316 default:
2317 if (p->score) {
2318 printf(" rewrite %s (%d%%)\n", p->two->path,
2319 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2320 show_mode_change(p, 0);
2321 } else show_mode_change(p, 1);
2322 break;
2323 }
2324 }
2325
2326 struct patch_id_t {
2327 struct xdiff_emit_state xm;
2328 SHA_CTX *ctx;
2329 int patchlen;
2330 };
2331
2332 static int remove_space(char *line, int len)
2333 {
2334 int i;
2335 char *dst = line;
2336 unsigned char c;
2337
2338 for (i = 0; i < len; i++)
2339 if (!isspace((c = line[i])))
2340 *dst++ = c;
2341
2342 return dst - line;
2343 }
2344
2345 static void patch_id_consume(void *priv, char *line, unsigned long len)
2346 {
2347 struct patch_id_t *data = priv;
2348 int new_len;
2349
2350 /* Ignore line numbers when computing the SHA1 of the patch */
2351 if (!strncmp(line, "@@ -", 4))
2352 return;
2353
2354 new_len = remove_space(line, len);
2355
2356 SHA1_Update(data->ctx, line, new_len);
2357 data->patchlen += new_len;
2358 }
2359
2360 /* returns 0 upon success, and writes result into sha1 */
2361 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2362 {
2363 struct diff_queue_struct *q = &diff_queued_diff;
2364 int i;
2365 SHA_CTX ctx;
2366 struct patch_id_t data;
2367 char buffer[PATH_MAX * 4 + 20];
2368
2369 SHA1_Init(&ctx);
2370 memset(&data, 0, sizeof(struct patch_id_t));
2371 data.ctx = &ctx;
2372 data.xm.consume = patch_id_consume;
2373
2374 for (i = 0; i < q->nr; i++) {
2375 xpparam_t xpp;
2376 xdemitconf_t xecfg;
2377 xdemitcb_t ecb;
2378 mmfile_t mf1, mf2;
2379 struct diff_filepair *p = q->queue[i];
2380 int len1, len2;
2381
2382 if (p->status == 0)
2383 return error("internal diff status error");
2384 if (p->status == DIFF_STATUS_UNKNOWN)
2385 continue;
2386 if (diff_unmodified_pair(p))
2387 continue;
2388 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2389 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2390 continue;
2391 if (DIFF_PAIR_UNMERGED(p))
2392 continue;
2393
2394 diff_fill_sha1_info(p->one);
2395 diff_fill_sha1_info(p->two);
2396 if (fill_mmfile(&mf1, p->one) < 0 ||
2397 fill_mmfile(&mf2, p->two) < 0)
2398 return error("unable to read files to diff");
2399
2400 /* Maybe hash p->two? into the patch id? */
2401 if (mmfile_is_binary(&mf2))
2402 continue;
2403
2404 len1 = remove_space(p->one->path, strlen(p->one->path));
2405 len2 = remove_space(p->two->path, strlen(p->two->path));
2406 if (p->one->mode == 0)
2407 len1 = snprintf(buffer, sizeof(buffer),
2408 "diff--gita/%.*sb/%.*s"
2409 "newfilemode%06o"
2410 "---/dev/null"
2411 "+++b/%.*s",
2412 len1, p->one->path,
2413 len2, p->two->path,
2414 p->two->mode,
2415 len2, p->two->path);
2416 else if (p->two->mode == 0)
2417 len1 = snprintf(buffer, sizeof(buffer),
2418 "diff--gita/%.*sb/%.*s"
2419 "deletedfilemode%06o"
2420 "---a/%.*s"
2421 "+++/dev/null",
2422 len1, p->one->path,
2423 len2, p->two->path,
2424 p->one->mode,
2425 len1, p->one->path);
2426 else
2427 len1 = snprintf(buffer, sizeof(buffer),
2428 "diff--gita/%.*sb/%.*s"
2429 "---a/%.*s"
2430 "+++b/%.*s",
2431 len1, p->one->path,
2432 len2, p->two->path,
2433 len1, p->one->path,
2434 len2, p->two->path);
2435 SHA1_Update(&ctx, buffer, len1);
2436
2437 xpp.flags = XDF_NEED_MINIMAL;
2438 xecfg.ctxlen = 3;
2439 xecfg.flags = XDL_EMIT_FUNCNAMES;
2440 ecb.outf = xdiff_outf;
2441 ecb.priv = &data;
2442 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2443 }
2444
2445 SHA1_Final(sha1, &ctx);
2446 return 0;
2447 }
2448
2449 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2450 {
2451 struct diff_queue_struct *q = &diff_queued_diff;
2452 int i;
2453 int result = diff_get_patch_id(options, sha1);
2454
2455 for (i = 0; i < q->nr; i++)
2456 diff_free_filepair(q->queue[i]);
2457
2458 free(q->queue);
2459 q->queue = NULL;
2460 q->nr = q->alloc = 0;
2461
2462 return result;
2463 }
2464
2465 static int is_summary_empty(const struct diff_queue_struct *q)
2466 {
2467 int i;
2468
2469 for (i = 0; i < q->nr; i++) {
2470 const struct diff_filepair *p = q->queue[i];
2471
2472 switch (p->status) {
2473 case DIFF_STATUS_DELETED:
2474 case DIFF_STATUS_ADDED:
2475 case DIFF_STATUS_COPIED:
2476 case DIFF_STATUS_RENAMED:
2477 return 0;
2478 default:
2479 if (p->score)
2480 return 0;
2481 if (p->one->mode && p->two->mode &&
2482 p->one->mode != p->two->mode)
2483 return 0;
2484 break;
2485 }
2486 }
2487 return 1;
2488 }
2489
2490 void diff_flush(struct diff_options *options)
2491 {
2492 struct diff_queue_struct *q = &diff_queued_diff;
2493 int i, output_format = options->output_format;
2494 int separator = 0;
2495
2496 /*
2497 * Order: raw, stat, summary, patch
2498 * or: name/name-status/checkdiff (other bits clear)
2499 */
2500 if (!q->nr)
2501 goto free_queue;
2502
2503 if (output_format & (DIFF_FORMAT_RAW |
2504 DIFF_FORMAT_NAME |
2505 DIFF_FORMAT_NAME_STATUS |
2506 DIFF_FORMAT_CHECKDIFF)) {
2507 for (i = 0; i < q->nr; i++) {
2508 struct diff_filepair *p = q->queue[i];
2509 if (check_pair_status(p))
2510 flush_one_pair(p, options);
2511 }
2512 separator++;
2513 }
2514
2515 if (output_format & DIFF_FORMAT_DIFFSTAT) {
2516 struct diffstat_t diffstat;
2517
2518 memset(&diffstat, 0, sizeof(struct diffstat_t));
2519 diffstat.xm.consume = diffstat_consume;
2520 for (i = 0; i < q->nr; i++) {
2521 struct diff_filepair *p = q->queue[i];
2522 if (check_pair_status(p))
2523 diff_flush_stat(p, options, &diffstat);
2524 }
2525 show_stats(&diffstat, options);
2526 separator++;
2527 }
2528
2529 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2530 for (i = 0; i < q->nr; i++)
2531 diff_summary(q->queue[i]);
2532 separator++;
2533 }
2534
2535 if (output_format & DIFF_FORMAT_PATCH) {
2536 if (separator) {
2537 if (options->stat_sep) {
2538 /* attach patch instead of inline */
2539 fputs(options->stat_sep, stdout);
2540 } else {
2541 putchar(options->line_termination);
2542 }
2543 }
2544
2545 for (i = 0; i < q->nr; i++) {
2546 struct diff_filepair *p = q->queue[i];
2547 if (check_pair_status(p))
2548 diff_flush_patch(p, options);
2549 }
2550 }
2551
2552 if (output_format & DIFF_FORMAT_CALLBACK)
2553 options->format_callback(q, options, options->format_callback_data);
2554
2555 for (i = 0; i < q->nr; i++)
2556 diff_free_filepair(q->queue[i]);
2557 free_queue:
2558 free(q->queue);
2559 q->queue = NULL;
2560 q->nr = q->alloc = 0;
2561 }
2562
2563 static void diffcore_apply_filter(const char *filter)
2564 {
2565 int i;
2566 struct diff_queue_struct *q = &diff_queued_diff;
2567 struct diff_queue_struct outq;
2568 outq.queue = NULL;
2569 outq.nr = outq.alloc = 0;
2570
2571 if (!filter)
2572 return;
2573
2574 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2575 int found;
2576 for (i = found = 0; !found && i < q->nr; i++) {
2577 struct diff_filepair *p = q->queue[i];
2578 if (((p->status == DIFF_STATUS_MODIFIED) &&
2579 ((p->score &&
2580 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2581 (!p->score &&
2582 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2583 ((p->status != DIFF_STATUS_MODIFIED) &&
2584 strchr(filter, p->status)))
2585 found++;
2586 }
2587 if (found)
2588 return;
2589
2590 /* otherwise we will clear the whole queue
2591 * by copying the empty outq at the end of this
2592 * function, but first clear the current entries
2593 * in the queue.
2594 */
2595 for (i = 0; i < q->nr; i++)
2596 diff_free_filepair(q->queue[i]);
2597 }
2598 else {
2599 /* Only the matching ones */
2600 for (i = 0; i < q->nr; i++) {
2601 struct diff_filepair *p = q->queue[i];
2602
2603 if (((p->status == DIFF_STATUS_MODIFIED) &&
2604 ((p->score &&
2605 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2606 (!p->score &&
2607 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2608 ((p->status != DIFF_STATUS_MODIFIED) &&
2609 strchr(filter, p->status)))
2610 diff_q(&outq, p);
2611 else
2612 diff_free_filepair(p);
2613 }
2614 }
2615 free(q->queue);
2616 *q = outq;
2617 }
2618
2619 void diffcore_std(struct diff_options *options)
2620 {
2621 if (options->break_opt != -1)
2622 diffcore_break(options->break_opt);
2623 if (options->detect_rename)
2624 diffcore_rename(options);
2625 if (options->break_opt != -1)
2626 diffcore_merge_broken();
2627 if (options->pickaxe)
2628 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2629 if (options->orderfile)
2630 diffcore_order(options->orderfile);
2631 diff_resolve_rename_copy();
2632 diffcore_apply_filter(options->filter);
2633 }
2634
2635
2636 void diffcore_std_no_resolve(struct diff_options *options)
2637 {
2638 if (options->pickaxe)
2639 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2640 if (options->orderfile)
2641 diffcore_order(options->orderfile);
2642 diffcore_apply_filter(options->filter);
2643 }
2644
2645 void diff_addremove(struct diff_options *options,
2646 int addremove, unsigned mode,
2647 const unsigned char *sha1,
2648 const char *base, const char *path)
2649 {
2650 char concatpath[PATH_MAX];
2651 struct diff_filespec *one, *two;
2652
2653 /* This may look odd, but it is a preparation for
2654 * feeding "there are unchanged files which should
2655 * not produce diffs, but when you are doing copy
2656 * detection you would need them, so here they are"
2657 * entries to the diff-core. They will be prefixed
2658 * with something like '=' or '*' (I haven't decided
2659 * which but should not make any difference).
2660 * Feeding the same new and old to diff_change()
2661 * also has the same effect.
2662 * Before the final output happens, they are pruned after
2663 * merged into rename/copy pairs as appropriate.
2664 */
2665 if (options->reverse_diff)
2666 addremove = (addremove == '+' ? '-' :
2667 addremove == '-' ? '+' : addremove);
2668
2669 if (!path) path = "";
2670 sprintf(concatpath, "%s%s", base, path);
2671 one = alloc_filespec(concatpath);
2672 two = alloc_filespec(concatpath);
2673
2674 if (addremove != '+')
2675 fill_filespec(one, sha1, mode);
2676 if (addremove != '-')
2677 fill_filespec(two, sha1, mode);
2678
2679 diff_queue(&diff_queued_diff, one, two);
2680 }
2681
2682 void diff_change(struct diff_options *options,
2683 unsigned old_mode, unsigned new_mode,
2684 const unsigned char *old_sha1,
2685 const unsigned char *new_sha1,
2686 const char *base, const char *path)
2687 {
2688 char concatpath[PATH_MAX];
2689 struct diff_filespec *one, *two;
2690
2691 if (options->reverse_diff) {
2692 unsigned tmp;
2693 const unsigned char *tmp_c;
2694 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
2695 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
2696 }
2697 if (!path) path = "";
2698 sprintf(concatpath, "%s%s", base, path);
2699 one = alloc_filespec(concatpath);
2700 two = alloc_filespec(concatpath);
2701 fill_filespec(one, old_sha1, old_mode);
2702 fill_filespec(two, new_sha1, new_mode);
2703
2704 diff_queue(&diff_queued_diff, one, two);
2705 }
2706
2707 void diff_unmerge(struct diff_options *options,
2708 const char *path)
2709 {
2710 struct diff_filespec *one, *two;
2711 one = alloc_filespec(path);
2712 two = alloc_filespec(path);
2713 diff_queue(&diff_queued_diff, one, two);
2714 }
MinGW port of GIT