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git-gc: run pack-refs by default unless the repo is bare
[debian-git.git] / diff.c
blobaaab3095a5f44d5d835bda4bc60112481bf94ed9
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11
12 #ifdef NO_FAST_WORKING_DIRECTORY
13 #define FAST_WORKING_DIRECTORY 0
14 #else
15 #define FAST_WORKING_DIRECTORY 1
16 #endif
17
18 static int use_size_cache;
19
20 static int diff_detect_rename_default;
21 static int diff_rename_limit_default = -1;
22 static int diff_use_color_default;
23
24 static char diff_colors[][COLOR_MAXLEN] = {
25 "\033[m", /* reset */
26 "", /* PLAIN (normal) */
27 "\033[1m", /* METAINFO (bold) */
28 "\033[36m", /* FRAGINFO (cyan) */
29 "\033[31m", /* OLD (red) */
30 "\033[32m", /* NEW (green) */
31 "\033[33m", /* COMMIT (yellow) */
32 "\033[41m", /* WHITESPACE (red background) */
33 };
34
35 static int parse_diff_color_slot(const char *var, int ofs)
36 {
37 if (!strcasecmp(var+ofs, "plain"))
38 return DIFF_PLAIN;
39 if (!strcasecmp(var+ofs, "meta"))
40 return DIFF_METAINFO;
41 if (!strcasecmp(var+ofs, "frag"))
42 return DIFF_FRAGINFO;
43 if (!strcasecmp(var+ofs, "old"))
44 return DIFF_FILE_OLD;
45 if (!strcasecmp(var+ofs, "new"))
46 return DIFF_FILE_NEW;
47 if (!strcasecmp(var+ofs, "commit"))
48 return DIFF_COMMIT;
49 if (!strcasecmp(var+ofs, "whitespace"))
50 return DIFF_WHITESPACE;
51 die("bad config variable '%s'", var);
52 }
53
54 /*
55 * These are to give UI layer defaults.
56 * The core-level commands such as git-diff-files should
57 * never be affected by the setting of diff.renames
58 * the user happens to have in the configuration file.
59 */
60 int git_diff_ui_config(const char *var, const char *value)
61 {
62 if (!strcmp(var, "diff.renamelimit")) {
63 diff_rename_limit_default = git_config_int(var, value);
64 return 0;
65 }
66 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
67 diff_use_color_default = git_config_colorbool(var, value);
68 return 0;
69 }
70 if (!strcmp(var, "diff.renames")) {
71 if (!value)
72 diff_detect_rename_default = DIFF_DETECT_RENAME;
73 else if (!strcasecmp(value, "copies") ||
74 !strcasecmp(value, "copy"))
75 diff_detect_rename_default = DIFF_DETECT_COPY;
76 else if (git_config_bool(var,value))
77 diff_detect_rename_default = DIFF_DETECT_RENAME;
78 return 0;
79 }
80 if (!strncmp(var, "diff.color.", 11) || !strncmp(var, "color.diff.", 11)) {
81 int slot = parse_diff_color_slot(var, 11);
82 color_parse(value, var, diff_colors[slot]);
83 return 0;
84 }
85 return git_default_config(var, value);
86 }
87
88 static char *quote_one(const char *str)
89 {
90 int needlen;
91 char *xp;
92
93 if (!str)
94 return NULL;
95 needlen = quote_c_style(str, NULL, NULL, 0);
96 if (!needlen)
97 return xstrdup(str);
98 xp = xmalloc(needlen + 1);
99 quote_c_style(str, xp, NULL, 0);
100 return xp;
101 }
102
103 static char *quote_two(const char *one, const char *two)
104 {
105 int need_one = quote_c_style(one, NULL, NULL, 1);
106 int need_two = quote_c_style(two, NULL, NULL, 1);
107 char *xp;
108
109 if (need_one + need_two) {
110 if (!need_one) need_one = strlen(one);
111 if (!need_two) need_one = strlen(two);
112
113 xp = xmalloc(need_one + need_two + 3);
114 xp[0] = '"';
115 quote_c_style(one, xp + 1, NULL, 1);
116 quote_c_style(two, xp + need_one + 1, NULL, 1);
117 strcpy(xp + need_one + need_two + 1, "\"");
118 return xp;
119 }
120 need_one = strlen(one);
121 need_two = strlen(two);
122 xp = xmalloc(need_one + need_two + 1);
123 strcpy(xp, one);
124 strcpy(xp + need_one, two);
125 return xp;
126 }
127
128 static const char *external_diff(void)
129 {
130 static const char *external_diff_cmd = NULL;
131 static int done_preparing = 0;
132
133 if (done_preparing)
134 return external_diff_cmd;
135 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
136 done_preparing = 1;
137 return external_diff_cmd;
138 }
139
140 #define TEMPFILE_PATH_LEN 50
141
142 static struct diff_tempfile {
143 const char *name; /* filename external diff should read from */
144 char hex[41];
145 char mode[10];
146 char tmp_path[TEMPFILE_PATH_LEN];
147 } diff_temp[2];
148
149 static int count_lines(const char *data, int size)
150 {
151 int count, ch, completely_empty = 1, nl_just_seen = 0;
152 count = 0;
153 while (0 < size--) {
154 ch = *data++;
155 if (ch == '\n') {
156 count++;
157 nl_just_seen = 1;
158 completely_empty = 0;
159 }
160 else {
161 nl_just_seen = 0;
162 completely_empty = 0;
163 }
164 }
165 if (completely_empty)
166 return 0;
167 if (!nl_just_seen)
168 count++; /* no trailing newline */
169 return count;
170 }
171
172 static void print_line_count(int count)
173 {
174 switch (count) {
175 case 0:
176 printf("0,0");
177 break;
178 case 1:
179 printf("1");
180 break;
181 default:
182 printf("1,%d", count);
183 break;
184 }
185 }
186
187 static void copy_file(int prefix, const char *data, int size)
188 {
189 int ch, nl_just_seen = 1;
190 while (0 < size--) {
191 ch = *data++;
192 if (nl_just_seen)
193 putchar(prefix);
194 putchar(ch);
195 if (ch == '\n')
196 nl_just_seen = 1;
197 else
198 nl_just_seen = 0;
199 }
200 if (!nl_just_seen)
201 printf("\n\\ No newline at end of file\n");
202 }
203
204 static void emit_rewrite_diff(const char *name_a,
205 const char *name_b,
206 struct diff_filespec *one,
207 struct diff_filespec *two)
208 {
209 int lc_a, lc_b;
210 diff_populate_filespec(one, 0);
211 diff_populate_filespec(two, 0);
212 lc_a = count_lines(one->data, one->size);
213 lc_b = count_lines(two->data, two->size);
214 printf("--- a/%s\n+++ b/%s\n@@ -", name_a, name_b);
215 print_line_count(lc_a);
216 printf(" +");
217 print_line_count(lc_b);
218 printf(" @@\n");
219 if (lc_a)
220 copy_file('-', one->data, one->size);
221 if (lc_b)
222 copy_file('+', two->data, two->size);
223 }
224
225 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
226 {
227 if (!DIFF_FILE_VALID(one)) {
228 mf->ptr = (char *)""; /* does not matter */
229 mf->size = 0;
230 return 0;
231 }
232 else if (diff_populate_filespec(one, 0))
233 return -1;
234 mf->ptr = one->data;
235 mf->size = one->size;
236 return 0;
237 }
238
239 struct diff_words_buffer {
240 mmfile_t text;
241 long alloc;
242 long current; /* output pointer */
243 int suppressed_newline;
244 };
245
246 static void diff_words_append(char *line, unsigned long len,
247 struct diff_words_buffer *buffer)
248 {
249 if (buffer->text.size + len > buffer->alloc) {
250 buffer->alloc = (buffer->text.size + len) * 3 / 2;
251 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
252 }
253 line++;
254 len--;
255 memcpy(buffer->text.ptr + buffer->text.size, line, len);
256 buffer->text.size += len;
257 }
258
259 struct diff_words_data {
260 struct xdiff_emit_state xm;
261 struct diff_words_buffer minus, plus;
262 };
263
264 static void print_word(struct diff_words_buffer *buffer, int len, int color,
265 int suppress_newline)
266 {
267 const char *ptr;
268 int eol = 0;
269
270 if (len == 0)
271 return;
272
273 ptr = buffer->text.ptr + buffer->current;
274 buffer->current += len;
275
276 if (ptr[len - 1] == '\n') {
277 eol = 1;
278 len--;
279 }
280
281 fputs(diff_get_color(1, color), stdout);
282 fwrite(ptr, len, 1, stdout);
283 fputs(diff_get_color(1, DIFF_RESET), stdout);
284
285 if (eol) {
286 if (suppress_newline)
287 buffer->suppressed_newline = 1;
288 else
289 putchar('\n');
290 }
291 }
292
293 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
294 {
295 struct diff_words_data *diff_words = priv;
296
297 if (diff_words->minus.suppressed_newline) {
298 if (line[0] != '+')
299 putchar('\n');
300 diff_words->minus.suppressed_newline = 0;
301 }
302
303 len--;
304 switch (line[0]) {
305 case '-':
306 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
307 break;
308 case '+':
309 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
310 break;
311 case ' ':
312 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
313 diff_words->minus.current += len;
314 break;
315 }
316 }
317
318 /* this executes the word diff on the accumulated buffers */
319 static void diff_words_show(struct diff_words_data *diff_words)
320 {
321 xpparam_t xpp;
322 xdemitconf_t xecfg;
323 xdemitcb_t ecb;
324 mmfile_t minus, plus;
325 int i;
326
327 minus.size = diff_words->minus.text.size;
328 minus.ptr = xmalloc(minus.size);
329 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
330 for (i = 0; i < minus.size; i++)
331 if (isspace(minus.ptr[i]))
332 minus.ptr[i] = '\n';
333 diff_words->minus.current = 0;
334
335 plus.size = diff_words->plus.text.size;
336 plus.ptr = xmalloc(plus.size);
337 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
338 for (i = 0; i < plus.size; i++)
339 if (isspace(plus.ptr[i]))
340 plus.ptr[i] = '\n';
341 diff_words->plus.current = 0;
342
343 xpp.flags = XDF_NEED_MINIMAL;
344 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
345 xecfg.flags = 0;
346 ecb.outf = xdiff_outf;
347 ecb.priv = diff_words;
348 diff_words->xm.consume = fn_out_diff_words_aux;
349 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
350
351 free(minus.ptr);
352 free(plus.ptr);
353 diff_words->minus.text.size = diff_words->plus.text.size = 0;
354
355 if (diff_words->minus.suppressed_newline) {
356 putchar('\n');
357 diff_words->minus.suppressed_newline = 0;
358 }
359 }
360
361 struct emit_callback {
362 struct xdiff_emit_state xm;
363 int nparents, color_diff;
364 const char **label_path;
365 struct diff_words_data *diff_words;
366 };
367
368 static void free_diff_words_data(struct emit_callback *ecbdata)
369 {
370 if (ecbdata->diff_words) {
371 /* flush buffers */
372 if (ecbdata->diff_words->minus.text.size ||
373 ecbdata->diff_words->plus.text.size)
374 diff_words_show(ecbdata->diff_words);
375
376 if (ecbdata->diff_words->minus.text.ptr)
377 free (ecbdata->diff_words->minus.text.ptr);
378 if (ecbdata->diff_words->plus.text.ptr)
379 free (ecbdata->diff_words->plus.text.ptr);
380 free(ecbdata->diff_words);
381 ecbdata->diff_words = NULL;
382 }
383 }
384
385 const char *diff_get_color(int diff_use_color, enum color_diff ix)
386 {
387 if (diff_use_color)
388 return diff_colors[ix];
389 return "";
390 }
391
392 static void emit_line(const char *set, const char *reset, const char *line, int len)
393 {
394 if (len > 0 && line[len-1] == '\n')
395 len--;
396 fputs(set, stdout);
397 fwrite(line, len, 1, stdout);
398 puts(reset);
399 }
400
401 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
402 {
403 int col0 = ecbdata->nparents;
404 int last_tab_in_indent = -1;
405 int last_space_in_indent = -1;
406 int i;
407 int tail = len;
408 int need_highlight_leading_space = 0;
409 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
410 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
411
412 if (!*ws) {
413 emit_line(set, reset, line, len);
414 return;
415 }
416
417 /* The line is a newly added line. Does it have funny leading
418 * whitespaces? In indent, SP should never precede a TAB.
419 */
420 for (i = col0; i < len; i++) {
421 if (line[i] == '\t') {
422 last_tab_in_indent = i;
423 if (0 <= last_space_in_indent)
424 need_highlight_leading_space = 1;
425 }
426 else if (line[i] == ' ')
427 last_space_in_indent = i;
428 else
429 break;
430 }
431 fputs(set, stdout);
432 fwrite(line, col0, 1, stdout);
433 fputs(reset, stdout);
434 if (((i == len) || line[i] == '\n') && i != col0) {
435 /* The whole line was indent */
436 emit_line(ws, reset, line + col0, len - col0);
437 return;
438 }
439 i = col0;
440 if (need_highlight_leading_space) {
441 while (i < last_tab_in_indent) {
442 if (line[i] == ' ') {
443 fputs(ws, stdout);
444 putchar(' ');
445 fputs(reset, stdout);
446 }
447 else
448 putchar(line[i]);
449 i++;
450 }
451 }
452 tail = len - 1;
453 if (line[tail] == '\n' && i < tail)
454 tail--;
455 while (i < tail) {
456 if (!isspace(line[tail]))
457 break;
458 tail--;
459 }
460 if ((i < tail && line[tail + 1] != '\n')) {
461 /* This has whitespace between tail+1..len */
462 fputs(set, stdout);
463 fwrite(line + i, tail - i + 1, 1, stdout);
464 fputs(reset, stdout);
465 emit_line(ws, reset, line + tail + 1, len - tail - 1);
466 }
467 else
468 emit_line(set, reset, line + i, len - i);
469 }
470
471 static void fn_out_consume(void *priv, char *line, unsigned long len)
472 {
473 int i;
474 int color;
475 struct emit_callback *ecbdata = priv;
476 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
477 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
478
479 if (ecbdata->label_path[0]) {
480 printf("%s--- %s%s\n", set, ecbdata->label_path[0], reset);
481 printf("%s+++ %s%s\n", set, ecbdata->label_path[1], reset);
482 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
483 }
484
485 /* This is not really necessary for now because
486 * this codepath only deals with two-way diffs.
487 */
488 for (i = 0; i < len && line[i] == '@'; i++)
489 ;
490 if (2 <= i && i < len && line[i] == ' ') {
491 ecbdata->nparents = i - 1;
492 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
493 reset, line, len);
494 return;
495 }
496
497 if (len < ecbdata->nparents) {
498 set = reset;
499 emit_line(reset, reset, line, len);
500 return;
501 }
502
503 color = DIFF_PLAIN;
504 if (ecbdata->diff_words && ecbdata->nparents != 1)
505 /* fall back to normal diff */
506 free_diff_words_data(ecbdata);
507 if (ecbdata->diff_words) {
508 if (line[0] == '-') {
509 diff_words_append(line, len,
510 &ecbdata->diff_words->minus);
511 return;
512 } else if (line[0] == '+') {
513 diff_words_append(line, len,
514 &ecbdata->diff_words->plus);
515 return;
516 }
517 if (ecbdata->diff_words->minus.text.size ||
518 ecbdata->diff_words->plus.text.size)
519 diff_words_show(ecbdata->diff_words);
520 line++;
521 len--;
522 emit_line(set, reset, line, len);
523 return;
524 }
525 for (i = 0; i < ecbdata->nparents && len; i++) {
526 if (line[i] == '-')
527 color = DIFF_FILE_OLD;
528 else if (line[i] == '+')
529 color = DIFF_FILE_NEW;
530 }
531
532 if (color != DIFF_FILE_NEW) {
533 emit_line(diff_get_color(ecbdata->color_diff, color),
534 reset, line, len);
535 return;
536 }
537 emit_add_line(reset, ecbdata, line, len);
538 }
539
540 static char *pprint_rename(const char *a, const char *b)
541 {
542 const char *old = a;
543 const char *new = b;
544 char *name = NULL;
545 int pfx_length, sfx_length;
546 int len_a = strlen(a);
547 int len_b = strlen(b);
548 int qlen_a = quote_c_style(a, NULL, NULL, 0);
549 int qlen_b = quote_c_style(b, NULL, NULL, 0);
550
551 if (qlen_a || qlen_b) {
552 if (qlen_a) len_a = qlen_a;
553 if (qlen_b) len_b = qlen_b;
554 name = xmalloc( len_a + len_b + 5 );
555 if (qlen_a)
556 quote_c_style(a, name, NULL, 0);
557 else
558 memcpy(name, a, len_a);
559 memcpy(name + len_a, " => ", 4);
560 if (qlen_b)
561 quote_c_style(b, name + len_a + 4, NULL, 0);
562 else
563 memcpy(name + len_a + 4, b, len_b + 1);
564 return name;
565 }
566
567 /* Find common prefix */
568 pfx_length = 0;
569 while (*old && *new && *old == *new) {
570 if (*old == '/')
571 pfx_length = old - a + 1;
572 old++;
573 new++;
574 }
575
576 /* Find common suffix */
577 old = a + len_a;
578 new = b + len_b;
579 sfx_length = 0;
580 while (a <= old && b <= new && *old == *new) {
581 if (*old == '/')
582 sfx_length = len_a - (old - a);
583 old--;
584 new--;
585 }
586
587 /*
588 * pfx{mid-a => mid-b}sfx
589 * {pfx-a => pfx-b}sfx
590 * pfx{sfx-a => sfx-b}
591 * name-a => name-b
592 */
593 if (pfx_length + sfx_length) {
594 int a_midlen = len_a - pfx_length - sfx_length;
595 int b_midlen = len_b - pfx_length - sfx_length;
596 if (a_midlen < 0) a_midlen = 0;
597 if (b_midlen < 0) b_midlen = 0;
598
599 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
600 sprintf(name, "%.*s{%.*s => %.*s}%s",
601 pfx_length, a,
602 a_midlen, a + pfx_length,
603 b_midlen, b + pfx_length,
604 a + len_a - sfx_length);
605 }
606 else {
607 name = xmalloc(len_a + len_b + 5);
608 sprintf(name, "%s => %s", a, b);
609 }
610 return name;
611 }
612
613 struct diffstat_t {
614 struct xdiff_emit_state xm;
615
616 int nr;
617 int alloc;
618 struct diffstat_file {
619 char *name;
620 unsigned is_unmerged:1;
621 unsigned is_binary:1;
622 unsigned is_renamed:1;
623 unsigned int added, deleted;
624 } **files;
625 };
626
627 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
628 const char *name_a,
629 const char *name_b)
630 {
631 struct diffstat_file *x;
632 x = xcalloc(sizeof (*x), 1);
633 if (diffstat->nr == diffstat->alloc) {
634 diffstat->alloc = alloc_nr(diffstat->alloc);
635 diffstat->files = xrealloc(diffstat->files,
636 diffstat->alloc * sizeof(x));
637 }
638 diffstat->files[diffstat->nr++] = x;
639 if (name_b) {
640 x->name = pprint_rename(name_a, name_b);
641 x->is_renamed = 1;
642 }
643 else
644 x->name = xstrdup(name_a);
645 return x;
646 }
647
648 static void diffstat_consume(void *priv, char *line, unsigned long len)
649 {
650 struct diffstat_t *diffstat = priv;
651 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
652
653 if (line[0] == '+')
654 x->added++;
655 else if (line[0] == '-')
656 x->deleted++;
657 }
658
659 const char mime_boundary_leader[] = "------------";
660
661 static int scale_linear(int it, int width, int max_change)
662 {
663 /*
664 * make sure that at least one '-' is printed if there were deletions,
665 * and likewise for '+'.
666 */
667 if (max_change < 2)
668 return it;
669 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
670 }
671
672 static void show_name(const char *prefix, const char *name, int len,
673 const char *reset, const char *set)
674 {
675 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
676 }
677
678 static void show_graph(char ch, int cnt, const char *set, const char *reset)
679 {
680 if (cnt <= 0)
681 return;
682 printf("%s", set);
683 while (cnt--)
684 putchar(ch);
685 printf("%s", reset);
686 }
687
688 static void show_stats(struct diffstat_t* data, struct diff_options *options)
689 {
690 int i, len, add, del, total, adds = 0, dels = 0;
691 int max_change = 0, max_len = 0;
692 int total_files = data->nr;
693 int width, name_width;
694 const char *reset, *set, *add_c, *del_c;
695
696 if (data->nr == 0)
697 return;
698
699 width = options->stat_width ? options->stat_width : 80;
700 name_width = options->stat_name_width ? options->stat_name_width : 50;
701
702 /* Sanity: give at least 5 columns to the graph,
703 * but leave at least 10 columns for the name.
704 */
705 if (width < name_width + 15) {
706 if (name_width <= 25)
707 width = name_width + 15;
708 else
709 name_width = width - 15;
710 }
711
712 /* Find the longest filename and max number of changes */
713 reset = diff_get_color(options->color_diff, DIFF_RESET);
714 set = diff_get_color(options->color_diff, DIFF_PLAIN);
715 add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
716 del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
717
718 for (i = 0; i < data->nr; i++) {
719 struct diffstat_file *file = data->files[i];
720 int change = file->added + file->deleted;
721
722 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
723 len = quote_c_style(file->name, NULL, NULL, 0);
724 if (len) {
725 char *qname = xmalloc(len + 1);
726 quote_c_style(file->name, qname, NULL, 0);
727 free(file->name);
728 file->name = qname;
729 }
730 }
731
732 len = strlen(file->name);
733 if (max_len < len)
734 max_len = len;
735
736 if (file->is_binary || file->is_unmerged)
737 continue;
738 if (max_change < change)
739 max_change = change;
740 }
741
742 /* Compute the width of the graph part;
743 * 10 is for one blank at the beginning of the line plus
744 * " | count " between the name and the graph.
745 *
746 * From here on, name_width is the width of the name area,
747 * and width is the width of the graph area.
748 */
749 name_width = (name_width < max_len) ? name_width : max_len;
750 if (width < (name_width + 10) + max_change)
751 width = width - (name_width + 10);
752 else
753 width = max_change;
754
755 for (i = 0; i < data->nr; i++) {
756 const char *prefix = "";
757 char *name = data->files[i]->name;
758 int added = data->files[i]->added;
759 int deleted = data->files[i]->deleted;
760 int name_len;
761
762 /*
763 * "scale" the filename
764 */
765 len = name_width;
766 name_len = strlen(name);
767 if (name_width < name_len) {
768 char *slash;
769 prefix = "...";
770 len -= 3;
771 name += name_len - len;
772 slash = strchr(name, '/');
773 if (slash)
774 name = slash;
775 }
776
777 if (data->files[i]->is_binary) {
778 show_name(prefix, name, len, reset, set);
779 printf(" Bin\n");
780 goto free_diffstat_file;
781 }
782 else if (data->files[i]->is_unmerged) {
783 show_name(prefix, name, len, reset, set);
784 printf(" Unmerged\n");
785 goto free_diffstat_file;
786 }
787 else if (!data->files[i]->is_renamed &&
788 (added + deleted == 0)) {
789 total_files--;
790 goto free_diffstat_file;
791 }
792
793 /*
794 * scale the add/delete
795 */
796 add = added;
797 del = deleted;
798 total = add + del;
799 adds += add;
800 dels += del;
801
802 if (width <= max_change) {
803 add = scale_linear(add, width, max_change);
804 del = scale_linear(del, width, max_change);
805 total = add + del;
806 }
807 show_name(prefix, name, len, reset, set);
808 printf("%5d ", added + deleted);
809 show_graph('+', add, add_c, reset);
810 show_graph('-', del, del_c, reset);
811 putchar('\n');
812 free_diffstat_file:
813 free(data->files[i]->name);
814 free(data->files[i]);
815 }
816 free(data->files);
817 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
818 set, total_files, adds, dels, reset);
819 }
820
821 static void show_shortstats(struct diffstat_t* data)
822 {
823 int i, adds = 0, dels = 0, total_files = data->nr;
824
825 if (data->nr == 0)
826 return;
827
828 for (i = 0; i < data->nr; i++) {
829 if (!data->files[i]->is_binary &&
830 !data->files[i]->is_unmerged) {
831 int added = data->files[i]->added;
832 int deleted= data->files[i]->deleted;
833 if (!data->files[i]->is_renamed &&
834 (added + deleted == 0)) {
835 total_files--;
836 } else {
837 adds += added;
838 dels += deleted;
839 }
840 }
841 free(data->files[i]->name);
842 free(data->files[i]);
843 }
844 free(data->files);
845
846 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
847 total_files, adds, dels);
848 }
849
850 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
851 {
852 int i;
853
854 for (i = 0; i < data->nr; i++) {
855 struct diffstat_file *file = data->files[i];
856
857 if (file->is_binary)
858 printf("-\t-\t");
859 else
860 printf("%d\t%d\t", file->added, file->deleted);
861 if (options->line_termination && !file->is_renamed &&
862 quote_c_style(file->name, NULL, NULL, 0))
863 quote_c_style(file->name, NULL, stdout, 0);
864 else
865 fputs(file->name, stdout);
866 putchar(options->line_termination);
867 }
868 }
869
870 struct checkdiff_t {
871 struct xdiff_emit_state xm;
872 const char *filename;
873 int lineno;
874 };
875
876 static void checkdiff_consume(void *priv, char *line, unsigned long len)
877 {
878 struct checkdiff_t *data = priv;
879
880 if (line[0] == '+') {
881 int i, spaces = 0;
882
883 /* check space before tab */
884 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
885 if (line[i] == ' ')
886 spaces++;
887 if (line[i - 1] == '\t' && spaces)
888 printf("%s:%d: space before tab:%.*s\n",
889 data->filename, data->lineno, (int)len, line);
890
891 /* check white space at line end */
892 if (line[len - 1] == '\n')
893 len--;
894 if (isspace(line[len - 1]))
895 printf("%s:%d: white space at end: %.*s\n",
896 data->filename, data->lineno, (int)len, line);
897
898 data->lineno++;
899 } else if (line[0] == ' ')
900 data->lineno++;
901 else if (line[0] == '@') {
902 char *plus = strchr(line, '+');
903 if (plus)
904 data->lineno = strtol(plus, NULL, 10);
905 else
906 die("invalid diff");
907 }
908 }
909
910 static unsigned char *deflate_it(char *data,
911 unsigned long size,
912 unsigned long *result_size)
913 {
914 int bound;
915 unsigned char *deflated;
916 z_stream stream;
917
918 memset(&stream, 0, sizeof(stream));
919 deflateInit(&stream, zlib_compression_level);
920 bound = deflateBound(&stream, size);
921 deflated = xmalloc(bound);
922 stream.next_out = deflated;
923 stream.avail_out = bound;
924
925 stream.next_in = (unsigned char *)data;
926 stream.avail_in = size;
927 while (deflate(&stream, Z_FINISH) == Z_OK)
928 ; /* nothing */
929 deflateEnd(&stream);
930 *result_size = stream.total_out;
931 return deflated;
932 }
933
934 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
935 {
936 void *cp;
937 void *delta;
938 void *deflated;
939 void *data;
940 unsigned long orig_size;
941 unsigned long delta_size;
942 unsigned long deflate_size;
943 unsigned long data_size;
944
945 /* We could do deflated delta, or we could do just deflated two,
946 * whichever is smaller.
947 */
948 delta = NULL;
949 deflated = deflate_it(two->ptr, two->size, &deflate_size);
950 if (one->size && two->size) {
951 delta = diff_delta(one->ptr, one->size,
952 two->ptr, two->size,
953 &delta_size, deflate_size);
954 if (delta) {
955 void *to_free = delta;
956 orig_size = delta_size;
957 delta = deflate_it(delta, delta_size, &delta_size);
958 free(to_free);
959 }
960 }
961
962 if (delta && delta_size < deflate_size) {
963 printf("delta %lu\n", orig_size);
964 free(deflated);
965 data = delta;
966 data_size = delta_size;
967 }
968 else {
969 printf("literal %lu\n", two->size);
970 free(delta);
971 data = deflated;
972 data_size = deflate_size;
973 }
974
975 /* emit data encoded in base85 */
976 cp = data;
977 while (data_size) {
978 int bytes = (52 < data_size) ? 52 : data_size;
979 char line[70];
980 data_size -= bytes;
981 if (bytes <= 26)
982 line[0] = bytes + 'A' - 1;
983 else
984 line[0] = bytes - 26 + 'a' - 1;
985 encode_85(line + 1, cp, bytes);
986 cp = (char *) cp + bytes;
987 puts(line);
988 }
989 printf("\n");
990 free(data);
991 }
992
993 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
994 {
995 printf("GIT binary patch\n");
996 emit_binary_diff_body(one, two);
997 emit_binary_diff_body(two, one);
998 }
999
1000 #define FIRST_FEW_BYTES 8000
1001 static int mmfile_is_binary(mmfile_t *mf)
1002 {
1003 long sz = mf->size;
1004 if (FIRST_FEW_BYTES < sz)
1005 sz = FIRST_FEW_BYTES;
1006 return !!memchr(mf->ptr, 0, sz);
1007 }
1008
1009 static void builtin_diff(const char *name_a,
1010 const char *name_b,
1011 struct diff_filespec *one,
1012 struct diff_filespec *two,
1013 const char *xfrm_msg,
1014 struct diff_options *o,
1015 int complete_rewrite)
1016 {
1017 mmfile_t mf1, mf2;
1018 const char *lbl[2];
1019 char *a_one, *b_two;
1020 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1021 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
1022
1023 a_one = quote_two("a/", name_a);
1024 b_two = quote_two("b/", name_b);
1025 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1026 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1027 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1028 if (lbl[0][0] == '/') {
1029 /* /dev/null */
1030 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1031 if (xfrm_msg && xfrm_msg[0])
1032 printf("%s%s%s\n", set, xfrm_msg, reset);
1033 }
1034 else if (lbl[1][0] == '/') {
1035 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1036 if (xfrm_msg && xfrm_msg[0])
1037 printf("%s%s%s\n", set, xfrm_msg, reset);
1038 }
1039 else {
1040 if (one->mode != two->mode) {
1041 printf("%sold mode %06o%s\n", set, one->mode, reset);
1042 printf("%snew mode %06o%s\n", set, two->mode, reset);
1043 }
1044 if (xfrm_msg && xfrm_msg[0])
1045 printf("%s%s%s\n", set, xfrm_msg, reset);
1046 /*
1047 * we do not run diff between different kind
1048 * of objects.
1049 */
1050 if ((one->mode ^ two->mode) & S_IFMT)
1051 goto free_ab_and_return;
1052 if (complete_rewrite) {
1053 emit_rewrite_diff(name_a, name_b, one, two);
1054 goto free_ab_and_return;
1055 }
1056 }
1057
1058 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1059 die("unable to read files to diff");
1060
1061 if (!o->text && (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))) {
1062 /* Quite common confusing case */
1063 if (mf1.size == mf2.size &&
1064 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1065 goto free_ab_and_return;
1066 if (o->binary)
1067 emit_binary_diff(&mf1, &mf2);
1068 else
1069 printf("Binary files %s and %s differ\n",
1070 lbl[0], lbl[1]);
1071 }
1072 else {
1073 /* Crazy xdl interfaces.. */
1074 const char *diffopts = getenv("GIT_DIFF_OPTS");
1075 xpparam_t xpp;
1076 xdemitconf_t xecfg;
1077 xdemitcb_t ecb;
1078 struct emit_callback ecbdata;
1079
1080 memset(&ecbdata, 0, sizeof(ecbdata));
1081 ecbdata.label_path = lbl;
1082 ecbdata.color_diff = o->color_diff;
1083 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1084 xecfg.ctxlen = o->context;
1085 xecfg.flags = XDL_EMIT_FUNCNAMES;
1086 if (!diffopts)
1087 ;
1088 else if (!strncmp(diffopts, "--unified=", 10))
1089 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1090 else if (!strncmp(diffopts, "-u", 2))
1091 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1092 ecb.outf = xdiff_outf;
1093 ecb.priv = &ecbdata;
1094 ecbdata.xm.consume = fn_out_consume;
1095 if (o->color_diff_words)
1096 ecbdata.diff_words =
1097 xcalloc(1, sizeof(struct diff_words_data));
1098 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1099 if (o->color_diff_words)
1100 free_diff_words_data(&ecbdata);
1101 }
1102
1103 free_ab_and_return:
1104 free(a_one);
1105 free(b_two);
1106 return;
1107 }
1108
1109 static void builtin_diffstat(const char *name_a, const char *name_b,
1110 struct diff_filespec *one,
1111 struct diff_filespec *two,
1112 struct diffstat_t *diffstat,
1113 struct diff_options *o,
1114 int complete_rewrite)
1115 {
1116 mmfile_t mf1, mf2;
1117 struct diffstat_file *data;
1118
1119 data = diffstat_add(diffstat, name_a, name_b);
1120
1121 if (!one || !two) {
1122 data->is_unmerged = 1;
1123 return;
1124 }
1125 if (complete_rewrite) {
1126 diff_populate_filespec(one, 0);
1127 diff_populate_filespec(two, 0);
1128 data->deleted = count_lines(one->data, one->size);
1129 data->added = count_lines(two->data, two->size);
1130 return;
1131 }
1132 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1133 die("unable to read files to diff");
1134
1135 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
1136 data->is_binary = 1;
1137 else {
1138 /* Crazy xdl interfaces.. */
1139 xpparam_t xpp;
1140 xdemitconf_t xecfg;
1141 xdemitcb_t ecb;
1142
1143 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1144 xecfg.ctxlen = 0;
1145 xecfg.flags = 0;
1146 ecb.outf = xdiff_outf;
1147 ecb.priv = diffstat;
1148 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1149 }
1150 }
1151
1152 static void builtin_checkdiff(const char *name_a, const char *name_b,
1153 struct diff_filespec *one,
1154 struct diff_filespec *two)
1155 {
1156 mmfile_t mf1, mf2;
1157 struct checkdiff_t data;
1158
1159 if (!two)
1160 return;
1161
1162 memset(&data, 0, sizeof(data));
1163 data.xm.consume = checkdiff_consume;
1164 data.filename = name_b ? name_b : name_a;
1165 data.lineno = 0;
1166
1167 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1168 die("unable to read files to diff");
1169
1170 if (mmfile_is_binary(&mf2))
1171 return;
1172 else {
1173 /* Crazy xdl interfaces.. */
1174 xpparam_t xpp;
1175 xdemitconf_t xecfg;
1176 xdemitcb_t ecb;
1177
1178 xpp.flags = XDF_NEED_MINIMAL;
1179 xecfg.ctxlen = 0;
1180 xecfg.flags = 0;
1181 ecb.outf = xdiff_outf;
1182 ecb.priv = &data;
1183 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1184 }
1185 }
1186
1187 struct diff_filespec *alloc_filespec(const char *path)
1188 {
1189 int namelen = strlen(path);
1190 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1191
1192 memset(spec, 0, sizeof(*spec));
1193 spec->path = (char *)(spec + 1);
1194 memcpy(spec->path, path, namelen+1);
1195 return spec;
1196 }
1197
1198 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1199 unsigned short mode)
1200 {
1201 if (mode) {
1202 spec->mode = canon_mode(mode);
1203 hashcpy(spec->sha1, sha1);
1204 spec->sha1_valid = !is_null_sha1(sha1);
1205 }
1206 }
1207
1208 /*
1209 * Given a name and sha1 pair, if the dircache tells us the file in
1210 * the work tree has that object contents, return true, so that
1211 * prepare_temp_file() does not have to inflate and extract.
1212 */
1213 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1214 {
1215 struct cache_entry *ce;
1216 struct stat st;
1217 int pos, len;
1218
1219 /* We do not read the cache ourselves here, because the
1220 * benchmark with my previous version that always reads cache
1221 * shows that it makes things worse for diff-tree comparing
1222 * two linux-2.6 kernel trees in an already checked out work
1223 * tree. This is because most diff-tree comparisons deal with
1224 * only a small number of files, while reading the cache is
1225 * expensive for a large project, and its cost outweighs the
1226 * savings we get by not inflating the object to a temporary
1227 * file. Practically, this code only helps when we are used
1228 * by diff-cache --cached, which does read the cache before
1229 * calling us.
1230 */
1231 if (!active_cache)
1232 return 0;
1233
1234 /* We want to avoid the working directory if our caller
1235 * doesn't need the data in a normal file, this system
1236 * is rather slow with its stat/open/mmap/close syscalls,
1237 * and the object is contained in a pack file. The pack
1238 * is probably already open and will be faster to obtain
1239 * the data through than the working directory. Loose
1240 * objects however would tend to be slower as they need
1241 * to be individually opened and inflated.
1242 */
1243 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1244 return 0;
1245
1246 len = strlen(name);
1247 pos = cache_name_pos(name, len);
1248 if (pos < 0)
1249 return 0;
1250 ce = active_cache[pos];
1251 if ((lstat(name, &st) < 0) ||
1252 !S_ISREG(st.st_mode) || /* careful! */
1253 ce_match_stat(ce, &st, 0) ||
1254 hashcmp(sha1, ce->sha1))
1255 return 0;
1256 /* we return 1 only when we can stat, it is a regular file,
1257 * stat information matches, and sha1 recorded in the cache
1258 * matches. I.e. we know the file in the work tree really is
1259 * the same as the <name, sha1> pair.
1260 */
1261 return 1;
1262 }
1263
1264 static struct sha1_size_cache {
1265 unsigned char sha1[20];
1266 unsigned long size;
1267 } **sha1_size_cache;
1268 static int sha1_size_cache_nr, sha1_size_cache_alloc;
1269
1270 static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
1271 int find_only,
1272 unsigned long size)
1273 {
1274 int first, last;
1275 struct sha1_size_cache *e;
1276
1277 first = 0;
1278 last = sha1_size_cache_nr;
1279 while (last > first) {
1280 int cmp, next = (last + first) >> 1;
1281 e = sha1_size_cache[next];
1282 cmp = hashcmp(e->sha1, sha1);
1283 if (!cmp)
1284 return e;
1285 if (cmp < 0) {
1286 last = next;
1287 continue;
1288 }
1289 first = next+1;
1290 }
1291 /* not found */
1292 if (find_only)
1293 return NULL;
1294 /* insert to make it at "first" */
1295 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
1296 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
1297 sha1_size_cache = xrealloc(sha1_size_cache,
1298 sha1_size_cache_alloc *
1299 sizeof(*sha1_size_cache));
1300 }
1301 sha1_size_cache_nr++;
1302 if (first < sha1_size_cache_nr)
1303 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
1304 (sha1_size_cache_nr - first - 1) *
1305 sizeof(*sha1_size_cache));
1306 e = xmalloc(sizeof(struct sha1_size_cache));
1307 sha1_size_cache[first] = e;
1308 hashcpy(e->sha1, sha1);
1309 e->size = size;
1310 return e;
1311 }
1312
1313 /*
1314 * While doing rename detection and pickaxe operation, we may need to
1315 * grab the data for the blob (or file) for our own in-core comparison.
1316 * diff_filespec has data and size fields for this purpose.
1317 */
1318 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1319 {
1320 int err = 0;
1321 if (!DIFF_FILE_VALID(s))
1322 die("internal error: asking to populate invalid file.");
1323 if (S_ISDIR(s->mode))
1324 return -1;
1325
1326 if (!use_size_cache)
1327 size_only = 0;
1328
1329 if (s->data)
1330 return err;
1331 if (!s->sha1_valid ||
1332 reuse_worktree_file(s->path, s->sha1, 0)) {
1333 struct stat st;
1334 int fd;
1335 if (lstat(s->path, &st) < 0) {
1336 if (errno == ENOENT) {
1337 err_empty:
1338 err = -1;
1339 empty:
1340 s->data = (char *)"";
1341 s->size = 0;
1342 return err;
1343 }
1344 }
1345 s->size = st.st_size;
1346 if (!s->size)
1347 goto empty;
1348 if (size_only)
1349 return 0;
1350 if (S_ISLNK(st.st_mode)) {
1351 int ret;
1352 s->data = xmalloc(s->size);
1353 s->should_free = 1;
1354 ret = readlink(s->path, s->data, s->size);
1355 if (ret < 0) {
1356 free(s->data);
1357 goto err_empty;
1358 }
1359 return 0;
1360 }
1361 fd = open(s->path, O_RDONLY);
1362 if (fd < 0)
1363 goto err_empty;
1364 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1365 close(fd);
1366 s->should_munmap = 1;
1367 }
1368 else {
1369 char type[20];
1370 struct sha1_size_cache *e;
1371
1372 if (size_only) {
1373 e = locate_size_cache(s->sha1, 1, 0);
1374 if (e) {
1375 s->size = e->size;
1376 return 0;
1377 }
1378 if (!sha1_object_info(s->sha1, type, &s->size))
1379 locate_size_cache(s->sha1, 0, s->size);
1380 }
1381 else {
1382 s->data = read_sha1_file(s->sha1, type, &s->size);
1383 s->should_free = 1;
1384 }
1385 }
1386 return 0;
1387 }
1388
1389 void diff_free_filespec_data(struct diff_filespec *s)
1390 {
1391 if (s->should_free)
1392 free(s->data);
1393 else if (s->should_munmap)
1394 munmap(s->data, s->size);
1395 s->should_free = s->should_munmap = 0;
1396 s->data = NULL;
1397 free(s->cnt_data);
1398 s->cnt_data = NULL;
1399 }
1400
1401 static void prep_temp_blob(struct diff_tempfile *temp,
1402 void *blob,
1403 unsigned long size,
1404 const unsigned char *sha1,
1405 int mode)
1406 {
1407 int fd;
1408
1409 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
1410 if (fd < 0)
1411 die("unable to create temp-file");
1412 if (write_in_full(fd, blob, size) != size)
1413 die("unable to write temp-file");
1414 close(fd);
1415 temp->name = temp->tmp_path;
1416 strcpy(temp->hex, sha1_to_hex(sha1));
1417 temp->hex[40] = 0;
1418 sprintf(temp->mode, "%06o", mode);
1419 }
1420
1421 static void prepare_temp_file(const char *name,
1422 struct diff_tempfile *temp,
1423 struct diff_filespec *one)
1424 {
1425 if (!DIFF_FILE_VALID(one)) {
1426 not_a_valid_file:
1427 /* A '-' entry produces this for file-2, and
1428 * a '+' entry produces this for file-1.
1429 */
1430 temp->name = "/dev/null";
1431 strcpy(temp->hex, ".");
1432 strcpy(temp->mode, ".");
1433 return;
1434 }
1435
1436 if (!one->sha1_valid ||
1437 reuse_worktree_file(name, one->sha1, 1)) {
1438 struct stat st;
1439 if (lstat(name, &st) < 0) {
1440 if (errno == ENOENT)
1441 goto not_a_valid_file;
1442 die("stat(%s): %s", name, strerror(errno));
1443 }
1444 if (S_ISLNK(st.st_mode)) {
1445 int ret;
1446 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1447 if (sizeof(buf) <= st.st_size)
1448 die("symlink too long: %s", name);
1449 ret = readlink(name, buf, st.st_size);
1450 if (ret < 0)
1451 die("readlink(%s)", name);
1452 prep_temp_blob(temp, buf, st.st_size,
1453 (one->sha1_valid ?
1454 one->sha1 : null_sha1),
1455 (one->sha1_valid ?
1456 one->mode : S_IFLNK));
1457 }
1458 else {
1459 /* we can borrow from the file in the work tree */
1460 temp->name = name;
1461 if (!one->sha1_valid)
1462 strcpy(temp->hex, sha1_to_hex(null_sha1));
1463 else
1464 strcpy(temp->hex, sha1_to_hex(one->sha1));
1465 /* Even though we may sometimes borrow the
1466 * contents from the work tree, we always want
1467 * one->mode. mode is trustworthy even when
1468 * !(one->sha1_valid), as long as
1469 * DIFF_FILE_VALID(one).
1470 */
1471 sprintf(temp->mode, "%06o", one->mode);
1472 }
1473 return;
1474 }
1475 else {
1476 if (diff_populate_filespec(one, 0))
1477 die("cannot read data blob for %s", one->path);
1478 prep_temp_blob(temp, one->data, one->size,
1479 one->sha1, one->mode);
1480 }
1481 }
1482
1483 static void remove_tempfile(void)
1484 {
1485 int i;
1486
1487 for (i = 0; i < 2; i++)
1488 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1489 unlink(diff_temp[i].name);
1490 diff_temp[i].name = NULL;
1491 }
1492 }
1493
1494 static void remove_tempfile_on_signal(int signo)
1495 {
1496 remove_tempfile();
1497 signal(SIGINT, SIG_DFL);
1498 raise(signo);
1499 }
1500
1501 static int spawn_prog(const char *pgm, const char **arg)
1502 {
1503 pid_t pid;
1504 int status;
1505
1506 fflush(NULL);
1507 pid = fork();
1508 if (pid < 0)
1509 die("unable to fork");
1510 if (!pid) {
1511 execvp(pgm, (char *const*) arg);
1512 exit(255);
1513 }
1514
1515 while (waitpid(pid, &status, 0) < 0) {
1516 if (errno == EINTR)
1517 continue;
1518 return -1;
1519 }
1520
1521 /* Earlier we did not check the exit status because
1522 * diff exits non-zero if files are different, and
1523 * we are not interested in knowing that. It was a
1524 * mistake which made it harder to quit a diff-*
1525 * session that uses the git-apply-patch-script as
1526 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1527 * should also exit non-zero only when it wants to
1528 * abort the entire diff-* session.
1529 */
1530 if (WIFEXITED(status) && !WEXITSTATUS(status))
1531 return 0;
1532 return -1;
1533 }
1534
1535 /* An external diff command takes:
1536 *
1537 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1538 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1539 *
1540 */
1541 static void run_external_diff(const char *pgm,
1542 const char *name,
1543 const char *other,
1544 struct diff_filespec *one,
1545 struct diff_filespec *two,
1546 const char *xfrm_msg,
1547 int complete_rewrite)
1548 {
1549 const char *spawn_arg[10];
1550 struct diff_tempfile *temp = diff_temp;
1551 int retval;
1552 static int atexit_asked = 0;
1553 const char *othername;
1554 const char **arg = &spawn_arg[0];
1555
1556 othername = (other? other : name);
1557 if (one && two) {
1558 prepare_temp_file(name, &temp[0], one);
1559 prepare_temp_file(othername, &temp[1], two);
1560 if (! atexit_asked &&
1561 (temp[0].name == temp[0].tmp_path ||
1562 temp[1].name == temp[1].tmp_path)) {
1563 atexit_asked = 1;
1564 atexit(remove_tempfile);
1565 }
1566 signal(SIGINT, remove_tempfile_on_signal);
1567 }
1568
1569 if (one && two) {
1570 *arg++ = pgm;
1571 *arg++ = name;
1572 *arg++ = temp[0].name;
1573 *arg++ = temp[0].hex;
1574 *arg++ = temp[0].mode;
1575 *arg++ = temp[1].name;
1576 *arg++ = temp[1].hex;
1577 *arg++ = temp[1].mode;
1578 if (other) {
1579 *arg++ = other;
1580 *arg++ = xfrm_msg;
1581 }
1582 } else {
1583 *arg++ = pgm;
1584 *arg++ = name;
1585 }
1586 *arg = NULL;
1587 retval = spawn_prog(pgm, spawn_arg);
1588 remove_tempfile();
1589 if (retval) {
1590 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1591 exit(1);
1592 }
1593 }
1594
1595 static void run_diff_cmd(const char *pgm,
1596 const char *name,
1597 const char *other,
1598 struct diff_filespec *one,
1599 struct diff_filespec *two,
1600 const char *xfrm_msg,
1601 struct diff_options *o,
1602 int complete_rewrite)
1603 {
1604 if (pgm) {
1605 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1606 complete_rewrite);
1607 return;
1608 }
1609 if (one && two)
1610 builtin_diff(name, other ? other : name,
1611 one, two, xfrm_msg, o, complete_rewrite);
1612 else
1613 printf("* Unmerged path %s\n", name);
1614 }
1615
1616 static void diff_fill_sha1_info(struct diff_filespec *one)
1617 {
1618 if (DIFF_FILE_VALID(one)) {
1619 if (!one->sha1_valid) {
1620 struct stat st;
1621 if (lstat(one->path, &st) < 0)
1622 die("stat %s", one->path);
1623 if (index_path(one->sha1, one->path, &st, 0))
1624 die("cannot hash %s\n", one->path);
1625 }
1626 }
1627 else
1628 hashclr(one->sha1);
1629 }
1630
1631 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1632 {
1633 const char *pgm = external_diff();
1634 char msg[PATH_MAX*2+300], *xfrm_msg;
1635 struct diff_filespec *one;
1636 struct diff_filespec *two;
1637 const char *name;
1638 const char *other;
1639 char *name_munged, *other_munged;
1640 int complete_rewrite = 0;
1641 int len;
1642
1643 if (DIFF_PAIR_UNMERGED(p)) {
1644 /* unmerged */
1645 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1646 return;
1647 }
1648
1649 name = p->one->path;
1650 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1651 name_munged = quote_one(name);
1652 other_munged = quote_one(other);
1653 one = p->one; two = p->two;
1654
1655 diff_fill_sha1_info(one);
1656 diff_fill_sha1_info(two);
1657
1658 len = 0;
1659 switch (p->status) {
1660 case DIFF_STATUS_COPIED:
1661 len += snprintf(msg + len, sizeof(msg) - len,
1662 "similarity index %d%%\n"
1663 "copy from %s\n"
1664 "copy to %s\n",
1665 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1666 name_munged, other_munged);
1667 break;
1668 case DIFF_STATUS_RENAMED:
1669 len += snprintf(msg + len, sizeof(msg) - len,
1670 "similarity index %d%%\n"
1671 "rename from %s\n"
1672 "rename to %s\n",
1673 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1674 name_munged, other_munged);
1675 break;
1676 case DIFF_STATUS_MODIFIED:
1677 if (p->score) {
1678 len += snprintf(msg + len, sizeof(msg) - len,
1679 "dissimilarity index %d%%\n",
1680 (int)(0.5 + p->score *
1681 100.0/MAX_SCORE));
1682 complete_rewrite = 1;
1683 break;
1684 }
1685 /* fallthru */
1686 default:
1687 /* nothing */
1688 ;
1689 }
1690
1691 if (hashcmp(one->sha1, two->sha1)) {
1692 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1693
1694 if (o->binary) {
1695 mmfile_t mf;
1696 if ((!fill_mmfile(&mf, one) && mmfile_is_binary(&mf)) ||
1697 (!fill_mmfile(&mf, two) && mmfile_is_binary(&mf)))
1698 abbrev = 40;
1699 }
1700 len += snprintf(msg + len, sizeof(msg) - len,
1701 "index %.*s..%.*s",
1702 abbrev, sha1_to_hex(one->sha1),
1703 abbrev, sha1_to_hex(two->sha1));
1704 if (one->mode == two->mode)
1705 len += snprintf(msg + len, sizeof(msg) - len,
1706 " %06o", one->mode);
1707 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1708 }
1709
1710 if (len)
1711 msg[--len] = 0;
1712 xfrm_msg = len ? msg : NULL;
1713
1714 if (!pgm &&
1715 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1716 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1717 /* a filepair that changes between file and symlink
1718 * needs to be split into deletion and creation.
1719 */
1720 struct diff_filespec *null = alloc_filespec(two->path);
1721 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1722 free(null);
1723 null = alloc_filespec(one->path);
1724 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1725 free(null);
1726 }
1727 else
1728 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1729 complete_rewrite);
1730
1731 free(name_munged);
1732 free(other_munged);
1733 }
1734
1735 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1736 struct diffstat_t *diffstat)
1737 {
1738 const char *name;
1739 const char *other;
1740 int complete_rewrite = 0;
1741
1742 if (DIFF_PAIR_UNMERGED(p)) {
1743 /* unmerged */
1744 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1745 return;
1746 }
1747
1748 name = p->one->path;
1749 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1750
1751 diff_fill_sha1_info(p->one);
1752 diff_fill_sha1_info(p->two);
1753
1754 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1755 complete_rewrite = 1;
1756 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
1757 }
1758
1759 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1760 {
1761 const char *name;
1762 const char *other;
1763
1764 if (DIFF_PAIR_UNMERGED(p)) {
1765 /* unmerged */
1766 return;
1767 }
1768
1769 name = p->one->path;
1770 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1771
1772 diff_fill_sha1_info(p->one);
1773 diff_fill_sha1_info(p->two);
1774
1775 builtin_checkdiff(name, other, p->one, p->two);
1776 }
1777
1778 void diff_setup(struct diff_options *options)
1779 {
1780 memset(options, 0, sizeof(*options));
1781 options->line_termination = '\n';
1782 options->break_opt = -1;
1783 options->rename_limit = -1;
1784 options->context = 3;
1785 options->msg_sep = "";
1786
1787 options->change = diff_change;
1788 options->add_remove = diff_addremove;
1789 options->color_diff = diff_use_color_default;
1790 options->detect_rename = diff_detect_rename_default;
1791 }
1792
1793 int diff_setup_done(struct diff_options *options)
1794 {
1795 int count = 0;
1796
1797 if (options->output_format & DIFF_FORMAT_NAME)
1798 count++;
1799 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
1800 count++;
1801 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
1802 count++;
1803 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
1804 count++;
1805 if (count > 1)
1806 die("--name-only, --name-status, --check and -s are mutually exclusive");
1807
1808 if (options->find_copies_harder)
1809 options->detect_rename = DIFF_DETECT_COPY;
1810
1811 if (options->output_format & (DIFF_FORMAT_NAME |
1812 DIFF_FORMAT_NAME_STATUS |
1813 DIFF_FORMAT_CHECKDIFF |
1814 DIFF_FORMAT_NO_OUTPUT))
1815 options->output_format &= ~(DIFF_FORMAT_RAW |
1816 DIFF_FORMAT_NUMSTAT |
1817 DIFF_FORMAT_DIFFSTAT |
1818 DIFF_FORMAT_SHORTSTAT |
1819 DIFF_FORMAT_SUMMARY |
1820 DIFF_FORMAT_PATCH);
1821
1822 /*
1823 * These cases always need recursive; we do not drop caller-supplied
1824 * recursive bits for other formats here.
1825 */
1826 if (options->output_format & (DIFF_FORMAT_PATCH |
1827 DIFF_FORMAT_NUMSTAT |
1828 DIFF_FORMAT_DIFFSTAT |
1829 DIFF_FORMAT_SHORTSTAT |
1830 DIFF_FORMAT_SUMMARY |
1831 DIFF_FORMAT_CHECKDIFF))
1832 options->recursive = 1;
1833 /*
1834 * Also pickaxe would not work very well if you do not say recursive
1835 */
1836 if (options->pickaxe)
1837 options->recursive = 1;
1838
1839 if (options->detect_rename && options->rename_limit < 0)
1840 options->rename_limit = diff_rename_limit_default;
1841 if (options->setup & DIFF_SETUP_USE_CACHE) {
1842 if (!active_cache)
1843 /* read-cache does not die even when it fails
1844 * so it is safe for us to do this here. Also
1845 * it does not smudge active_cache or active_nr
1846 * when it fails, so we do not have to worry about
1847 * cleaning it up ourselves either.
1848 */
1849 read_cache();
1850 }
1851 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
1852 use_size_cache = 1;
1853 if (options->abbrev <= 0 || 40 < options->abbrev)
1854 options->abbrev = 40; /* full */
1855
1856 return 0;
1857 }
1858
1859 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
1860 {
1861 char c, *eq;
1862 int len;
1863
1864 if (*arg != '-')
1865 return 0;
1866 c = *++arg;
1867 if (!c)
1868 return 0;
1869 if (c == arg_short) {
1870 c = *++arg;
1871 if (!c)
1872 return 1;
1873 if (val && isdigit(c)) {
1874 char *end;
1875 int n = strtoul(arg, &end, 10);
1876 if (*end)
1877 return 0;
1878 *val = n;
1879 return 1;
1880 }
1881 return 0;
1882 }
1883 if (c != '-')
1884 return 0;
1885 arg++;
1886 eq = strchr(arg, '=');
1887 if (eq)
1888 len = eq - arg;
1889 else
1890 len = strlen(arg);
1891 if (!len || strncmp(arg, arg_long, len))
1892 return 0;
1893 if (eq) {
1894 int n;
1895 char *end;
1896 if (!isdigit(*++eq))
1897 return 0;
1898 n = strtoul(eq, &end, 10);
1899 if (*end)
1900 return 0;
1901 *val = n;
1902 }
1903 return 1;
1904 }
1905
1906 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
1907 {
1908 const char *arg = av[0];
1909 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
1910 options->output_format |= DIFF_FORMAT_PATCH;
1911 else if (opt_arg(arg, 'U', "unified", &options->context))
1912 options->output_format |= DIFF_FORMAT_PATCH;
1913 else if (!strcmp(arg, "--raw"))
1914 options->output_format |= DIFF_FORMAT_RAW;
1915 else if (!strcmp(arg, "--patch-with-raw")) {
1916 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
1917 }
1918 else if (!strcmp(arg, "--numstat")) {
1919 options->output_format |= DIFF_FORMAT_NUMSTAT;
1920 }
1921 else if (!strcmp(arg, "--shortstat")) {
1922 options->output_format |= DIFF_FORMAT_SHORTSTAT;
1923 }
1924 else if (!strncmp(arg, "--stat", 6)) {
1925 char *end;
1926 int width = options->stat_width;
1927 int name_width = options->stat_name_width;
1928 arg += 6;
1929 end = (char *)arg;
1930
1931 switch (*arg) {
1932 case '-':
1933 if (!strncmp(arg, "-width=", 7))
1934 width = strtoul(arg + 7, &end, 10);
1935 else if (!strncmp(arg, "-name-width=", 12))
1936 name_width = strtoul(arg + 12, &end, 10);
1937 break;
1938 case '=':
1939 width = strtoul(arg+1, &end, 10);
1940 if (*end == ',')
1941 name_width = strtoul(end+1, &end, 10);
1942 }
1943
1944 /* Important! This checks all the error cases! */
1945 if (*end)
1946 return 0;
1947 options->output_format |= DIFF_FORMAT_DIFFSTAT;
1948 options->stat_name_width = name_width;
1949 options->stat_width = width;
1950 }
1951 else if (!strcmp(arg, "--check"))
1952 options->output_format |= DIFF_FORMAT_CHECKDIFF;
1953 else if (!strcmp(arg, "--summary"))
1954 options->output_format |= DIFF_FORMAT_SUMMARY;
1955 else if (!strcmp(arg, "--patch-with-stat")) {
1956 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
1957 }
1958 else if (!strcmp(arg, "-z"))
1959 options->line_termination = 0;
1960 else if (!strncmp(arg, "-l", 2))
1961 options->rename_limit = strtoul(arg+2, NULL, 10);
1962 else if (!strcmp(arg, "--full-index"))
1963 options->full_index = 1;
1964 else if (!strcmp(arg, "--binary")) {
1965 options->output_format |= DIFF_FORMAT_PATCH;
1966 options->binary = 1;
1967 }
1968 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
1969 options->text = 1;
1970 }
1971 else if (!strcmp(arg, "--name-only"))
1972 options->output_format |= DIFF_FORMAT_NAME;
1973 else if (!strcmp(arg, "--name-status"))
1974 options->output_format |= DIFF_FORMAT_NAME_STATUS;
1975 else if (!strcmp(arg, "-R"))
1976 options->reverse_diff = 1;
1977 else if (!strncmp(arg, "-S", 2))
1978 options->pickaxe = arg + 2;
1979 else if (!strcmp(arg, "-s")) {
1980 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
1981 }
1982 else if (!strncmp(arg, "-O", 2))
1983 options->orderfile = arg + 2;
1984 else if (!strncmp(arg, "--diff-filter=", 14))
1985 options->filter = arg + 14;
1986 else if (!strcmp(arg, "--pickaxe-all"))
1987 options->pickaxe_opts = DIFF_PICKAXE_ALL;
1988 else if (!strcmp(arg, "--pickaxe-regex"))
1989 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
1990 else if (!strncmp(arg, "-B", 2)) {
1991 if ((options->break_opt =
1992 diff_scoreopt_parse(arg)) == -1)
1993 return -1;
1994 }
1995 else if (!strncmp(arg, "-M", 2)) {
1996 if ((options->rename_score =
1997 diff_scoreopt_parse(arg)) == -1)
1998 return -1;
1999 options->detect_rename = DIFF_DETECT_RENAME;
2000 }
2001 else if (!strncmp(arg, "-C", 2)) {
2002 if ((options->rename_score =
2003 diff_scoreopt_parse(arg)) == -1)
2004 return -1;
2005 options->detect_rename = DIFF_DETECT_COPY;
2006 }
2007 else if (!strcmp(arg, "--find-copies-harder"))
2008 options->find_copies_harder = 1;
2009 else if (!strcmp(arg, "--abbrev"))
2010 options->abbrev = DEFAULT_ABBREV;
2011 else if (!strncmp(arg, "--abbrev=", 9)) {
2012 options->abbrev = strtoul(arg + 9, NULL, 10);
2013 if (options->abbrev < MINIMUM_ABBREV)
2014 options->abbrev = MINIMUM_ABBREV;
2015 else if (40 < options->abbrev)
2016 options->abbrev = 40;
2017 }
2018 else if (!strcmp(arg, "--color"))
2019 options->color_diff = 1;
2020 else if (!strcmp(arg, "--no-color"))
2021 options->color_diff = 0;
2022 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2023 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2024 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2025 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2026 else if (!strcmp(arg, "--color-words"))
2027 options->color_diff = options->color_diff_words = 1;
2028 else if (!strcmp(arg, "--no-renames"))
2029 options->detect_rename = 0;
2030 else
2031 return 0;
2032 return 1;
2033 }
2034
2035 static int parse_num(const char **cp_p)
2036 {
2037 unsigned long num, scale;
2038 int ch, dot;
2039 const char *cp = *cp_p;
2040
2041 num = 0;
2042 scale = 1;
2043 dot = 0;
2044 for(;;) {
2045 ch = *cp;
2046 if ( !dot && ch == '.' ) {
2047 scale = 1;
2048 dot = 1;
2049 } else if ( ch == '%' ) {
2050 scale = dot ? scale*100 : 100;
2051 cp++; /* % is always at the end */
2052 break;
2053 } else if ( ch >= '0' && ch <= '9' ) {
2054 if ( scale < 100000 ) {
2055 scale *= 10;
2056 num = (num*10) + (ch-'0');
2057 }
2058 } else {
2059 break;
2060 }
2061 cp++;
2062 }
2063 *cp_p = cp;
2064
2065 /* user says num divided by scale and we say internally that
2066 * is MAX_SCORE * num / scale.
2067 */
2068 return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
2069 }
2070
2071 int diff_scoreopt_parse(const char *opt)
2072 {
2073 int opt1, opt2, cmd;
2074
2075 if (*opt++ != '-')
2076 return -1;
2077 cmd = *opt++;
2078 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2079 return -1; /* that is not a -M, -C nor -B option */
2080
2081 opt1 = parse_num(&opt);
2082 if (cmd != 'B')
2083 opt2 = 0;
2084 else {
2085 if (*opt == 0)
2086 opt2 = 0;
2087 else if (*opt != '/')
2088 return -1; /* we expect -B80/99 or -B80 */
2089 else {
2090 opt++;
2091 opt2 = parse_num(&opt);
2092 }
2093 }
2094 if (*opt != 0)
2095 return -1;
2096 return opt1 | (opt2 << 16);
2097 }
2098
2099 struct diff_queue_struct diff_queued_diff;
2100
2101 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2102 {
2103 if (queue->alloc <= queue->nr) {
2104 queue->alloc = alloc_nr(queue->alloc);
2105 queue->queue = xrealloc(queue->queue,
2106 sizeof(dp) * queue->alloc);
2107 }
2108 queue->queue[queue->nr++] = dp;
2109 }
2110
2111 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2112 struct diff_filespec *one,
2113 struct diff_filespec *two)
2114 {
2115 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2116 dp->one = one;
2117 dp->two = two;
2118 if (queue)
2119 diff_q(queue, dp);
2120 return dp;
2121 }
2122
2123 void diff_free_filepair(struct diff_filepair *p)
2124 {
2125 diff_free_filespec_data(p->one);
2126 diff_free_filespec_data(p->two);
2127 free(p->one);
2128 free(p->two);
2129 free(p);
2130 }
2131
2132 /* This is different from find_unique_abbrev() in that
2133 * it stuffs the result with dots for alignment.
2134 */
2135 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2136 {
2137 int abblen;
2138 const char *abbrev;
2139 if (len == 40)
2140 return sha1_to_hex(sha1);
2141
2142 abbrev = find_unique_abbrev(sha1, len);
2143 if (!abbrev)
2144 return sha1_to_hex(sha1);
2145 abblen = strlen(abbrev);
2146 if (abblen < 37) {
2147 static char hex[41];
2148 if (len < abblen && abblen <= len + 2)
2149 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2150 else
2151 sprintf(hex, "%s...", abbrev);
2152 return hex;
2153 }
2154 return sha1_to_hex(sha1);
2155 }
2156
2157 static void diff_flush_raw(struct diff_filepair *p,
2158 struct diff_options *options)
2159 {
2160 int two_paths;
2161 char status[10];
2162 int abbrev = options->abbrev;
2163 const char *path_one, *path_two;
2164 int inter_name_termination = '\t';
2165 int line_termination = options->line_termination;
2166
2167 if (!line_termination)
2168 inter_name_termination = 0;
2169
2170 path_one = p->one->path;
2171 path_two = p->two->path;
2172 if (line_termination) {
2173 path_one = quote_one(path_one);
2174 path_two = quote_one(path_two);
2175 }
2176
2177 if (p->score)
2178 sprintf(status, "%c%03d", p->status,
2179 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2180 else {
2181 status[0] = p->status;
2182 status[1] = 0;
2183 }
2184 switch (p->status) {
2185 case DIFF_STATUS_COPIED:
2186 case DIFF_STATUS_RENAMED:
2187 two_paths = 1;
2188 break;
2189 case DIFF_STATUS_ADDED:
2190 case DIFF_STATUS_DELETED:
2191 two_paths = 0;
2192 break;
2193 default:
2194 two_paths = 0;
2195 break;
2196 }
2197 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
2198 printf(":%06o %06o %s ",
2199 p->one->mode, p->two->mode,
2200 diff_unique_abbrev(p->one->sha1, abbrev));
2201 printf("%s ",
2202 diff_unique_abbrev(p->two->sha1, abbrev));
2203 }
2204 printf("%s%c%s", status, inter_name_termination, path_one);
2205 if (two_paths)
2206 printf("%c%s", inter_name_termination, path_two);
2207 putchar(line_termination);
2208 if (path_one != p->one->path)
2209 free((void*)path_one);
2210 if (path_two != p->two->path)
2211 free((void*)path_two);
2212 }
2213
2214 static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
2215 {
2216 char *path = p->two->path;
2217
2218 if (opt->line_termination)
2219 path = quote_one(p->two->path);
2220 printf("%s%c", path, opt->line_termination);
2221 if (p->two->path != path)
2222 free(path);
2223 }
2224
2225 int diff_unmodified_pair(struct diff_filepair *p)
2226 {
2227 /* This function is written stricter than necessary to support
2228 * the currently implemented transformers, but the idea is to
2229 * let transformers to produce diff_filepairs any way they want,
2230 * and filter and clean them up here before producing the output.
2231 */
2232 struct diff_filespec *one, *two;
2233
2234 if (DIFF_PAIR_UNMERGED(p))
2235 return 0; /* unmerged is interesting */
2236
2237 one = p->one;
2238 two = p->two;
2239
2240 /* deletion, addition, mode or type change
2241 * and rename are all interesting.
2242 */
2243 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2244 DIFF_PAIR_MODE_CHANGED(p) ||
2245 strcmp(one->path, two->path))
2246 return 0;
2247
2248 /* both are valid and point at the same path. that is, we are
2249 * dealing with a change.
2250 */
2251 if (one->sha1_valid && two->sha1_valid &&
2252 !hashcmp(one->sha1, two->sha1))
2253 return 1; /* no change */
2254 if (!one->sha1_valid && !two->sha1_valid)
2255 return 1; /* both look at the same file on the filesystem. */
2256 return 0;
2257 }
2258
2259 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2260 {
2261 if (diff_unmodified_pair(p))
2262 return;
2263
2264 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2265 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2266 return; /* no tree diffs in patch format */
2267
2268 run_diff(p, o);
2269 }
2270
2271 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2272 struct diffstat_t *diffstat)
2273 {
2274 if (diff_unmodified_pair(p))
2275 return;
2276
2277 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2278 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2279 return; /* no tree diffs in patch format */
2280
2281 run_diffstat(p, o, diffstat);
2282 }
2283
2284 static void diff_flush_checkdiff(struct diff_filepair *p,
2285 struct diff_options *o)
2286 {
2287 if (diff_unmodified_pair(p))
2288 return;
2289
2290 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2291 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2292 return; /* no tree diffs in patch format */
2293
2294 run_checkdiff(p, o);
2295 }
2296
2297 int diff_queue_is_empty(void)
2298 {
2299 struct diff_queue_struct *q = &diff_queued_diff;
2300 int i;
2301 for (i = 0; i < q->nr; i++)
2302 if (!diff_unmodified_pair(q->queue[i]))
2303 return 0;
2304 return 1;
2305 }
2306
2307 #if DIFF_DEBUG
2308 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2309 {
2310 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2311 x, one ? one : "",
2312 s->path,
2313 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2314 s->mode,
2315 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2316 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2317 x, one ? one : "",
2318 s->size, s->xfrm_flags);
2319 }
2320
2321 void diff_debug_filepair(const struct diff_filepair *p, int i)
2322 {
2323 diff_debug_filespec(p->one, i, "one");
2324 diff_debug_filespec(p->two, i, "two");
2325 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2326 p->score, p->status ? p->status : '?',
2327 p->source_stays, p->broken_pair);
2328 }
2329
2330 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2331 {
2332 int i;
2333 if (msg)
2334 fprintf(stderr, "%s\n", msg);
2335 fprintf(stderr, "q->nr = %d\n", q->nr);
2336 for (i = 0; i < q->nr; i++) {
2337 struct diff_filepair *p = q->queue[i];
2338 diff_debug_filepair(p, i);
2339 }
2340 }
2341 #endif
2342
2343 static void diff_resolve_rename_copy(void)
2344 {
2345 int i, j;
2346 struct diff_filepair *p, *pp;
2347 struct diff_queue_struct *q = &diff_queued_diff;
2348
2349 diff_debug_queue("resolve-rename-copy", q);
2350
2351 for (i = 0; i < q->nr; i++) {
2352 p = q->queue[i];
2353 p->status = 0; /* undecided */
2354 if (DIFF_PAIR_UNMERGED(p))
2355 p->status = DIFF_STATUS_UNMERGED;
2356 else if (!DIFF_FILE_VALID(p->one))
2357 p->status = DIFF_STATUS_ADDED;
2358 else if (!DIFF_FILE_VALID(p->two))
2359 p->status = DIFF_STATUS_DELETED;
2360 else if (DIFF_PAIR_TYPE_CHANGED(p))
2361 p->status = DIFF_STATUS_TYPE_CHANGED;
2362
2363 /* from this point on, we are dealing with a pair
2364 * whose both sides are valid and of the same type, i.e.
2365 * either in-place edit or rename/copy edit.
2366 */
2367 else if (DIFF_PAIR_RENAME(p)) {
2368 if (p->source_stays) {
2369 p->status = DIFF_STATUS_COPIED;
2370 continue;
2371 }
2372 /* See if there is some other filepair that
2373 * copies from the same source as us. If so
2374 * we are a copy. Otherwise we are either a
2375 * copy if the path stays, or a rename if it
2376 * does not, but we already handled "stays" case.
2377 */
2378 for (j = i + 1; j < q->nr; j++) {
2379 pp = q->queue[j];
2380 if (strcmp(pp->one->path, p->one->path))
2381 continue; /* not us */
2382 if (!DIFF_PAIR_RENAME(pp))
2383 continue; /* not a rename/copy */
2384 /* pp is a rename/copy from the same source */
2385 p->status = DIFF_STATUS_COPIED;
2386 break;
2387 }
2388 if (!p->status)
2389 p->status = DIFF_STATUS_RENAMED;
2390 }
2391 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2392 p->one->mode != p->two->mode)
2393 p->status = DIFF_STATUS_MODIFIED;
2394 else {
2395 /* This is a "no-change" entry and should not
2396 * happen anymore, but prepare for broken callers.
2397 */
2398 error("feeding unmodified %s to diffcore",
2399 p->one->path);
2400 p->status = DIFF_STATUS_UNKNOWN;
2401 }
2402 }
2403 diff_debug_queue("resolve-rename-copy done", q);
2404 }
2405
2406 static int check_pair_status(struct diff_filepair *p)
2407 {
2408 switch (p->status) {
2409 case DIFF_STATUS_UNKNOWN:
2410 return 0;
2411 case 0:
2412 die("internal error in diff-resolve-rename-copy");
2413 default:
2414 return 1;
2415 }
2416 }
2417
2418 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2419 {
2420 int fmt = opt->output_format;
2421
2422 if (fmt & DIFF_FORMAT_CHECKDIFF)
2423 diff_flush_checkdiff(p, opt);
2424 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2425 diff_flush_raw(p, opt);
2426 else if (fmt & DIFF_FORMAT_NAME)
2427 diff_flush_name(p, opt);
2428 }
2429
2430 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2431 {
2432 char *name = quote_one(fs->path);
2433 if (fs->mode)
2434 printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
2435 else
2436 printf(" %s %s\n", newdelete, name);
2437 free(name);
2438 }
2439
2440
2441 static void show_mode_change(struct diff_filepair *p, int show_name)
2442 {
2443 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2444 if (show_name) {
2445 char *name = quote_one(p->two->path);
2446 printf(" mode change %06o => %06o %s\n",
2447 p->one->mode, p->two->mode, name);
2448 free(name);
2449 }
2450 else
2451 printf(" mode change %06o => %06o\n",
2452 p->one->mode, p->two->mode);
2453 }
2454 }
2455
2456 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2457 {
2458 char *names = pprint_rename(p->one->path, p->two->path);
2459
2460 printf(" %s %s (%d%%)\n", renamecopy, names,
2461 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2462 free(names);
2463 show_mode_change(p, 0);
2464 }
2465
2466 static void diff_summary(struct diff_filepair *p)
2467 {
2468 switch(p->status) {
2469 case DIFF_STATUS_DELETED:
2470 show_file_mode_name("delete", p->one);
2471 break;
2472 case DIFF_STATUS_ADDED:
2473 show_file_mode_name("create", p->two);
2474 break;
2475 case DIFF_STATUS_COPIED:
2476 show_rename_copy("copy", p);
2477 break;
2478 case DIFF_STATUS_RENAMED:
2479 show_rename_copy("rename", p);
2480 break;
2481 default:
2482 if (p->score) {
2483 char *name = quote_one(p->two->path);
2484 printf(" rewrite %s (%d%%)\n", name,
2485 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2486 free(name);
2487 show_mode_change(p, 0);
2488 } else show_mode_change(p, 1);
2489 break;
2490 }
2491 }
2492
2493 struct patch_id_t {
2494 struct xdiff_emit_state xm;
2495 SHA_CTX *ctx;
2496 int patchlen;
2497 };
2498
2499 static int remove_space(char *line, int len)
2500 {
2501 int i;
2502 char *dst = line;
2503 unsigned char c;
2504
2505 for (i = 0; i < len; i++)
2506 if (!isspace((c = line[i])))
2507 *dst++ = c;
2508
2509 return dst - line;
2510 }
2511
2512 static void patch_id_consume(void *priv, char *line, unsigned long len)
2513 {
2514 struct patch_id_t *data = priv;
2515 int new_len;
2516
2517 /* Ignore line numbers when computing the SHA1 of the patch */
2518 if (!strncmp(line, "@@ -", 4))
2519 return;
2520
2521 new_len = remove_space(line, len);
2522
2523 SHA1_Update(data->ctx, line, new_len);
2524 data->patchlen += new_len;
2525 }
2526
2527 /* returns 0 upon success, and writes result into sha1 */
2528 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2529 {
2530 struct diff_queue_struct *q = &diff_queued_diff;
2531 int i;
2532 SHA_CTX ctx;
2533 struct patch_id_t data;
2534 char buffer[PATH_MAX * 4 + 20];
2535
2536 SHA1_Init(&ctx);
2537 memset(&data, 0, sizeof(struct patch_id_t));
2538 data.ctx = &ctx;
2539 data.xm.consume = patch_id_consume;
2540
2541 for (i = 0; i < q->nr; i++) {
2542 xpparam_t xpp;
2543 xdemitconf_t xecfg;
2544 xdemitcb_t ecb;
2545 mmfile_t mf1, mf2;
2546 struct diff_filepair *p = q->queue[i];
2547 int len1, len2;
2548
2549 if (p->status == 0)
2550 return error("internal diff status error");
2551 if (p->status == DIFF_STATUS_UNKNOWN)
2552 continue;
2553 if (diff_unmodified_pair(p))
2554 continue;
2555 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2556 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2557 continue;
2558 if (DIFF_PAIR_UNMERGED(p))
2559 continue;
2560
2561 diff_fill_sha1_info(p->one);
2562 diff_fill_sha1_info(p->two);
2563 if (fill_mmfile(&mf1, p->one) < 0 ||
2564 fill_mmfile(&mf2, p->two) < 0)
2565 return error("unable to read files to diff");
2566
2567 /* Maybe hash p->two? into the patch id? */
2568 if (mmfile_is_binary(&mf2))
2569 continue;
2570
2571 len1 = remove_space(p->one->path, strlen(p->one->path));
2572 len2 = remove_space(p->two->path, strlen(p->two->path));
2573 if (p->one->mode == 0)
2574 len1 = snprintf(buffer, sizeof(buffer),
2575 "diff--gita/%.*sb/%.*s"
2576 "newfilemode%06o"
2577 "---/dev/null"
2578 "+++b/%.*s",
2579 len1, p->one->path,
2580 len2, p->two->path,
2581 p->two->mode,
2582 len2, p->two->path);
2583 else if (p->two->mode == 0)
2584 len1 = snprintf(buffer, sizeof(buffer),
2585 "diff--gita/%.*sb/%.*s"
2586 "deletedfilemode%06o"
2587 "---a/%.*s"
2588 "+++/dev/null",
2589 len1, p->one->path,
2590 len2, p->two->path,
2591 p->one->mode,
2592 len1, p->one->path);
2593 else
2594 len1 = snprintf(buffer, sizeof(buffer),
2595 "diff--gita/%.*sb/%.*s"
2596 "---a/%.*s"
2597 "+++b/%.*s",
2598 len1, p->one->path,
2599 len2, p->two->path,
2600 len1, p->one->path,
2601 len2, p->two->path);
2602 SHA1_Update(&ctx, buffer, len1);
2603
2604 xpp.flags = XDF_NEED_MINIMAL;
2605 xecfg.ctxlen = 3;
2606 xecfg.flags = XDL_EMIT_FUNCNAMES;
2607 ecb.outf = xdiff_outf;
2608 ecb.priv = &data;
2609 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2610 }
2611
2612 SHA1_Final(sha1, &ctx);
2613 return 0;
2614 }
2615
2616 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2617 {
2618 struct diff_queue_struct *q = &diff_queued_diff;
2619 int i;
2620 int result = diff_get_patch_id(options, sha1);
2621
2622 for (i = 0; i < q->nr; i++)
2623 diff_free_filepair(q->queue[i]);
2624
2625 free(q->queue);
2626 q->queue = NULL;
2627 q->nr = q->alloc = 0;
2628
2629 return result;
2630 }
2631
2632 static int is_summary_empty(const struct diff_queue_struct *q)
2633 {
2634 int i;
2635
2636 for (i = 0; i < q->nr; i++) {
2637 const struct diff_filepair *p = q->queue[i];
2638
2639 switch (p->status) {
2640 case DIFF_STATUS_DELETED:
2641 case DIFF_STATUS_ADDED:
2642 case DIFF_STATUS_COPIED:
2643 case DIFF_STATUS_RENAMED:
2644 return 0;
2645 default:
2646 if (p->score)
2647 return 0;
2648 if (p->one->mode && p->two->mode &&
2649 p->one->mode != p->two->mode)
2650 return 0;
2651 break;
2652 }
2653 }
2654 return 1;
2655 }
2656
2657 void diff_flush(struct diff_options *options)
2658 {
2659 struct diff_queue_struct *q = &diff_queued_diff;
2660 int i, output_format = options->output_format;
2661 int separator = 0;
2662
2663 /*
2664 * Order: raw, stat, summary, patch
2665 * or: name/name-status/checkdiff (other bits clear)
2666 */
2667 if (!q->nr)
2668 goto free_queue;
2669
2670 if (output_format & (DIFF_FORMAT_RAW |
2671 DIFF_FORMAT_NAME |
2672 DIFF_FORMAT_NAME_STATUS |
2673 DIFF_FORMAT_CHECKDIFF)) {
2674 for (i = 0; i < q->nr; i++) {
2675 struct diff_filepair *p = q->queue[i];
2676 if (check_pair_status(p))
2677 flush_one_pair(p, options);
2678 }
2679 separator++;
2680 }
2681
2682 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2683 struct diffstat_t diffstat;
2684
2685 memset(&diffstat, 0, sizeof(struct diffstat_t));
2686 diffstat.xm.consume = diffstat_consume;
2687 for (i = 0; i < q->nr; i++) {
2688 struct diff_filepair *p = q->queue[i];
2689 if (check_pair_status(p))
2690 diff_flush_stat(p, options, &diffstat);
2691 }
2692 if (output_format & DIFF_FORMAT_NUMSTAT)
2693 show_numstat(&diffstat, options);
2694 if (output_format & DIFF_FORMAT_DIFFSTAT)
2695 show_stats(&diffstat, options);
2696 else if (output_format & DIFF_FORMAT_SHORTSTAT)
2697 show_shortstats(&diffstat);
2698 separator++;
2699 }
2700
2701 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2702 for (i = 0; i < q->nr; i++)
2703 diff_summary(q->queue[i]);
2704 separator++;
2705 }
2706
2707 if (output_format & DIFF_FORMAT_PATCH) {
2708 if (separator) {
2709 if (options->stat_sep) {
2710 /* attach patch instead of inline */
2711 fputs(options->stat_sep, stdout);
2712 } else {
2713 putchar(options->line_termination);
2714 }
2715 }
2716
2717 for (i = 0; i < q->nr; i++) {
2718 struct diff_filepair *p = q->queue[i];
2719 if (check_pair_status(p))
2720 diff_flush_patch(p, options);
2721 }
2722 }
2723
2724 if (output_format & DIFF_FORMAT_CALLBACK)
2725 options->format_callback(q, options, options->format_callback_data);
2726
2727 for (i = 0; i < q->nr; i++)
2728 diff_free_filepair(q->queue[i]);
2729 free_queue:
2730 free(q->queue);
2731 q->queue = NULL;
2732 q->nr = q->alloc = 0;
2733 }
2734
2735 static void diffcore_apply_filter(const char *filter)
2736 {
2737 int i;
2738 struct diff_queue_struct *q = &diff_queued_diff;
2739 struct diff_queue_struct outq;
2740 outq.queue = NULL;
2741 outq.nr = outq.alloc = 0;
2742
2743 if (!filter)
2744 return;
2745
2746 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2747 int found;
2748 for (i = found = 0; !found && i < q->nr; i++) {
2749 struct diff_filepair *p = q->queue[i];
2750 if (((p->status == DIFF_STATUS_MODIFIED) &&
2751 ((p->score &&
2752 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2753 (!p->score &&
2754 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2755 ((p->status != DIFF_STATUS_MODIFIED) &&
2756 strchr(filter, p->status)))
2757 found++;
2758 }
2759 if (found)
2760 return;
2761
2762 /* otherwise we will clear the whole queue
2763 * by copying the empty outq at the end of this
2764 * function, but first clear the current entries
2765 * in the queue.
2766 */
2767 for (i = 0; i < q->nr; i++)
2768 diff_free_filepair(q->queue[i]);
2769 }
2770 else {
2771 /* Only the matching ones */
2772 for (i = 0; i < q->nr; i++) {
2773 struct diff_filepair *p = q->queue[i];
2774
2775 if (((p->status == DIFF_STATUS_MODIFIED) &&
2776 ((p->score &&
2777 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2778 (!p->score &&
2779 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2780 ((p->status != DIFF_STATUS_MODIFIED) &&
2781 strchr(filter, p->status)))
2782 diff_q(&outq, p);
2783 else
2784 diff_free_filepair(p);
2785 }
2786 }
2787 free(q->queue);
2788 *q = outq;
2789 }
2790
2791 void diffcore_std(struct diff_options *options)
2792 {
2793 if (options->break_opt != -1)
2794 diffcore_break(options->break_opt);
2795 if (options->detect_rename)
2796 diffcore_rename(options);
2797 if (options->break_opt != -1)
2798 diffcore_merge_broken();
2799 if (options->pickaxe)
2800 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2801 if (options->orderfile)
2802 diffcore_order(options->orderfile);
2803 diff_resolve_rename_copy();
2804 diffcore_apply_filter(options->filter);
2805 }
2806
2807
2808 void diffcore_std_no_resolve(struct diff_options *options)
2809 {
2810 if (options->pickaxe)
2811 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2812 if (options->orderfile)
2813 diffcore_order(options->orderfile);
2814 diffcore_apply_filter(options->filter);
2815 }
2816
2817 void diff_addremove(struct diff_options *options,
2818 int addremove, unsigned mode,
2819 const unsigned char *sha1,
2820 const char *base, const char *path)
2821 {
2822 char concatpath[PATH_MAX];
2823 struct diff_filespec *one, *two;
2824
2825 /* This may look odd, but it is a preparation for
2826 * feeding "there are unchanged files which should
2827 * not produce diffs, but when you are doing copy
2828 * detection you would need them, so here they are"
2829 * entries to the diff-core. They will be prefixed
2830 * with something like '=' or '*' (I haven't decided
2831 * which but should not make any difference).
2832 * Feeding the same new and old to diff_change()
2833 * also has the same effect.
2834 * Before the final output happens, they are pruned after
2835 * merged into rename/copy pairs as appropriate.
2836 */
2837 if (options->reverse_diff)
2838 addremove = (addremove == '+' ? '-' :
2839 addremove == '-' ? '+' : addremove);
2840
2841 if (!path) path = "";
2842 sprintf(concatpath, "%s%s", base, path);
2843 one = alloc_filespec(concatpath);
2844 two = alloc_filespec(concatpath);
2845
2846 if (addremove != '+')
2847 fill_filespec(one, sha1, mode);
2848 if (addremove != '-')
2849 fill_filespec(two, sha1, mode);
2850
2851 diff_queue(&diff_queued_diff, one, two);
2852 }
2853
2854 void diff_change(struct diff_options *options,
2855 unsigned old_mode, unsigned new_mode,
2856 const unsigned char *old_sha1,
2857 const unsigned char *new_sha1,
2858 const char *base, const char *path)
2859 {
2860 char concatpath[PATH_MAX];
2861 struct diff_filespec *one, *two;
2862
2863 if (options->reverse_diff) {
2864 unsigned tmp;
2865 const unsigned char *tmp_c;
2866 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
2867 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
2868 }
2869 if (!path) path = "";
2870 sprintf(concatpath, "%s%s", base, path);
2871 one = alloc_filespec(concatpath);
2872 two = alloc_filespec(concatpath);
2873 fill_filespec(one, old_sha1, old_mode);
2874 fill_filespec(two, new_sha1, new_mode);
2875
2876 diff_queue(&diff_queued_diff, one, two);
2877 }
2878
2879 void diff_unmerge(struct diff_options *options,
2880 const char *path,
2881 unsigned mode, const unsigned char *sha1)
2882 {
2883 struct diff_filespec *one, *two;
2884 one = alloc_filespec(path);
2885 two = alloc_filespec(path);
2886 fill_filespec(one, sha1, mode);
2887 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
2888 }
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