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Document git-check-attr
[git/gitweb.git] / diff.c
blobdcea405ed39199164251f2be0c42984a0c86aea5
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 #include "attr.h"
12
13 #ifdef NO_FAST_WORKING_DIRECTORY
14 #define FAST_WORKING_DIRECTORY 0
15 #else
16 #define FAST_WORKING_DIRECTORY 1
17 #endif
18
19 static int use_size_cache;
20
21 static int diff_detect_rename_default;
22 static int diff_rename_limit_default = -1;
23 static int diff_use_color_default;
24
25 static char diff_colors[][COLOR_MAXLEN] = {
26 "\033[m", /* reset */
27 "", /* PLAIN (normal) */
28 "\033[1m", /* METAINFO (bold) */
29 "\033[36m", /* FRAGINFO (cyan) */
30 "\033[31m", /* OLD (red) */
31 "\033[32m", /* NEW (green) */
32 "\033[33m", /* COMMIT (yellow) */
33 "\033[41m", /* WHITESPACE (red background) */
34 };
35
36 static int parse_diff_color_slot(const char *var, int ofs)
37 {
38 if (!strcasecmp(var+ofs, "plain"))
39 return DIFF_PLAIN;
40 if (!strcasecmp(var+ofs, "meta"))
41 return DIFF_METAINFO;
42 if (!strcasecmp(var+ofs, "frag"))
43 return DIFF_FRAGINFO;
44 if (!strcasecmp(var+ofs, "old"))
45 return DIFF_FILE_OLD;
46 if (!strcasecmp(var+ofs, "new"))
47 return DIFF_FILE_NEW;
48 if (!strcasecmp(var+ofs, "commit"))
49 return DIFF_COMMIT;
50 if (!strcasecmp(var+ofs, "whitespace"))
51 return DIFF_WHITESPACE;
52 die("bad config variable '%s'", var);
53 }
54
55 /*
56 * These are to give UI layer defaults.
57 * The core-level commands such as git-diff-files should
58 * never be affected by the setting of diff.renames
59 * the user happens to have in the configuration file.
60 */
61 int git_diff_ui_config(const char *var, const char *value)
62 {
63 if (!strcmp(var, "diff.renamelimit")) {
64 diff_rename_limit_default = git_config_int(var, value);
65 return 0;
66 }
67 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
68 diff_use_color_default = git_config_colorbool(var, value);
69 return 0;
70 }
71 if (!strcmp(var, "diff.renames")) {
72 if (!value)
73 diff_detect_rename_default = DIFF_DETECT_RENAME;
74 else if (!strcasecmp(value, "copies") ||
75 !strcasecmp(value, "copy"))
76 diff_detect_rename_default = DIFF_DETECT_COPY;
77 else if (git_config_bool(var,value))
78 diff_detect_rename_default = DIFF_DETECT_RENAME;
79 return 0;
80 }
81 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
82 int slot = parse_diff_color_slot(var, 11);
83 color_parse(value, var, diff_colors[slot]);
84 return 0;
85 }
86 return git_default_config(var, value);
87 }
88
89 static char *quote_one(const char *str)
90 {
91 int needlen;
92 char *xp;
93
94 if (!str)
95 return NULL;
96 needlen = quote_c_style(str, NULL, NULL, 0);
97 if (!needlen)
98 return xstrdup(str);
99 xp = xmalloc(needlen + 1);
100 quote_c_style(str, xp, NULL, 0);
101 return xp;
102 }
103
104 static char *quote_two(const char *one, const char *two)
105 {
106 int need_one = quote_c_style(one, NULL, NULL, 1);
107 int need_two = quote_c_style(two, NULL, NULL, 1);
108 char *xp;
109
110 if (need_one + need_two) {
111 if (!need_one) need_one = strlen(one);
112 if (!need_two) need_one = strlen(two);
113
114 xp = xmalloc(need_one + need_two + 3);
115 xp[0] = '"';
116 quote_c_style(one, xp + 1, NULL, 1);
117 quote_c_style(two, xp + need_one + 1, NULL, 1);
118 strcpy(xp + need_one + need_two + 1, "\"");
119 return xp;
120 }
121 need_one = strlen(one);
122 need_two = strlen(two);
123 xp = xmalloc(need_one + need_two + 1);
124 strcpy(xp, one);
125 strcpy(xp + need_one, two);
126 return xp;
127 }
128
129 static const char *external_diff(void)
130 {
131 static const char *external_diff_cmd = NULL;
132 static int done_preparing = 0;
133
134 if (done_preparing)
135 return external_diff_cmd;
136 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
137 done_preparing = 1;
138 return external_diff_cmd;
139 }
140
141 #define TEMPFILE_PATH_LEN 50
142
143 static struct diff_tempfile {
144 const char *name; /* filename external diff should read from */
145 char hex[41];
146 char mode[10];
147 char tmp_path[TEMPFILE_PATH_LEN];
148 } diff_temp[2];
149
150 static int count_lines(const char *data, int size)
151 {
152 int count, ch, completely_empty = 1, nl_just_seen = 0;
153 count = 0;
154 while (0 < size--) {
155 ch = *data++;
156 if (ch == '\n') {
157 count++;
158 nl_just_seen = 1;
159 completely_empty = 0;
160 }
161 else {
162 nl_just_seen = 0;
163 completely_empty = 0;
164 }
165 }
166 if (completely_empty)
167 return 0;
168 if (!nl_just_seen)
169 count++; /* no trailing newline */
170 return count;
171 }
172
173 static void print_line_count(int count)
174 {
175 switch (count) {
176 case 0:
177 printf("0,0");
178 break;
179 case 1:
180 printf("1");
181 break;
182 default:
183 printf("1,%d", count);
184 break;
185 }
186 }
187
188 static void copy_file(int prefix, const char *data, int size,
189 const char *set, const char *reset)
190 {
191 int ch, nl_just_seen = 1;
192 while (0 < size--) {
193 ch = *data++;
194 if (nl_just_seen) {
195 fputs(set, stdout);
196 putchar(prefix);
197 }
198 if (ch == '\n') {
199 nl_just_seen = 1;
200 fputs(reset, stdout);
201 } else
202 nl_just_seen = 0;
203 putchar(ch);
204 }
205 if (!nl_just_seen)
206 printf("%s\n\\ No newline at end of file\n", reset);
207 }
208
209 static void emit_rewrite_diff(const char *name_a,
210 const char *name_b,
211 struct diff_filespec *one,
212 struct diff_filespec *two,
213 int color_diff)
214 {
215 int lc_a, lc_b;
216 const char *name_a_tab, *name_b_tab;
217 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
218 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
219 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
220 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
221 const char *reset = diff_get_color(color_diff, DIFF_RESET);
222
223 name_a += (*name_a == '/');
224 name_b += (*name_b == '/');
225 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
226 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
227
228 diff_populate_filespec(one, 0);
229 diff_populate_filespec(two, 0);
230 lc_a = count_lines(one->data, one->size);
231 lc_b = count_lines(two->data, two->size);
232 printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
233 metainfo, name_a, name_a_tab, reset,
234 metainfo, name_b, name_b_tab, reset, fraginfo);
235 print_line_count(lc_a);
236 printf(" +");
237 print_line_count(lc_b);
238 printf(" @@%s\n", reset);
239 if (lc_a)
240 copy_file('-', one->data, one->size, old, reset);
241 if (lc_b)
242 copy_file('+', two->data, two->size, new, reset);
243 }
244
245 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
246 {
247 if (!DIFF_FILE_VALID(one)) {
248 mf->ptr = (char *)""; /* does not matter */
249 mf->size = 0;
250 return 0;
251 }
252 else if (diff_populate_filespec(one, 0))
253 return -1;
254 mf->ptr = one->data;
255 mf->size = one->size;
256 return 0;
257 }
258
259 struct diff_words_buffer {
260 mmfile_t text;
261 long alloc;
262 long current; /* output pointer */
263 int suppressed_newline;
264 };
265
266 static void diff_words_append(char *line, unsigned long len,
267 struct diff_words_buffer *buffer)
268 {
269 if (buffer->text.size + len > buffer->alloc) {
270 buffer->alloc = (buffer->text.size + len) * 3 / 2;
271 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
272 }
273 line++;
274 len--;
275 memcpy(buffer->text.ptr + buffer->text.size, line, len);
276 buffer->text.size += len;
277 }
278
279 struct diff_words_data {
280 struct xdiff_emit_state xm;
281 struct diff_words_buffer minus, plus;
282 };
283
284 static void print_word(struct diff_words_buffer *buffer, int len, int color,
285 int suppress_newline)
286 {
287 const char *ptr;
288 int eol = 0;
289
290 if (len == 0)
291 return;
292
293 ptr = buffer->text.ptr + buffer->current;
294 buffer->current += len;
295
296 if (ptr[len - 1] == '\n') {
297 eol = 1;
298 len--;
299 }
300
301 fputs(diff_get_color(1, color), stdout);
302 fwrite(ptr, len, 1, stdout);
303 fputs(diff_get_color(1, DIFF_RESET), stdout);
304
305 if (eol) {
306 if (suppress_newline)
307 buffer->suppressed_newline = 1;
308 else
309 putchar('\n');
310 }
311 }
312
313 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
314 {
315 struct diff_words_data *diff_words = priv;
316
317 if (diff_words->minus.suppressed_newline) {
318 if (line[0] != '+')
319 putchar('\n');
320 diff_words->minus.suppressed_newline = 0;
321 }
322
323 len--;
324 switch (line[0]) {
325 case '-':
326 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
327 break;
328 case '+':
329 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
330 break;
331 case ' ':
332 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
333 diff_words->minus.current += len;
334 break;
335 }
336 }
337
338 /* this executes the word diff on the accumulated buffers */
339 static void diff_words_show(struct diff_words_data *diff_words)
340 {
341 xpparam_t xpp;
342 xdemitconf_t xecfg;
343 xdemitcb_t ecb;
344 mmfile_t minus, plus;
345 int i;
346
347 minus.size = diff_words->minus.text.size;
348 minus.ptr = xmalloc(minus.size);
349 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
350 for (i = 0; i < minus.size; i++)
351 if (isspace(minus.ptr[i]))
352 minus.ptr[i] = '\n';
353 diff_words->minus.current = 0;
354
355 plus.size = diff_words->plus.text.size;
356 plus.ptr = xmalloc(plus.size);
357 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
358 for (i = 0; i < plus.size; i++)
359 if (isspace(plus.ptr[i]))
360 plus.ptr[i] = '\n';
361 diff_words->plus.current = 0;
362
363 xpp.flags = XDF_NEED_MINIMAL;
364 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
365 xecfg.flags = 0;
366 ecb.outf = xdiff_outf;
367 ecb.priv = diff_words;
368 diff_words->xm.consume = fn_out_diff_words_aux;
369 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
370
371 free(minus.ptr);
372 free(plus.ptr);
373 diff_words->minus.text.size = diff_words->plus.text.size = 0;
374
375 if (diff_words->minus.suppressed_newline) {
376 putchar('\n');
377 diff_words->minus.suppressed_newline = 0;
378 }
379 }
380
381 struct emit_callback {
382 struct xdiff_emit_state xm;
383 int nparents, color_diff;
384 const char **label_path;
385 struct diff_words_data *diff_words;
386 int *found_changesp;
387 };
388
389 static void free_diff_words_data(struct emit_callback *ecbdata)
390 {
391 if (ecbdata->diff_words) {
392 /* flush buffers */
393 if (ecbdata->diff_words->minus.text.size ||
394 ecbdata->diff_words->plus.text.size)
395 diff_words_show(ecbdata->diff_words);
396
397 if (ecbdata->diff_words->minus.text.ptr)
398 free (ecbdata->diff_words->minus.text.ptr);
399 if (ecbdata->diff_words->plus.text.ptr)
400 free (ecbdata->diff_words->plus.text.ptr);
401 free(ecbdata->diff_words);
402 ecbdata->diff_words = NULL;
403 }
404 }
405
406 const char *diff_get_color(int diff_use_color, enum color_diff ix)
407 {
408 if (diff_use_color)
409 return diff_colors[ix];
410 return "";
411 }
412
413 static void emit_line(const char *set, const char *reset, const char *line, int len)
414 {
415 if (len > 0 && line[len-1] == '\n')
416 len--;
417 fputs(set, stdout);
418 fwrite(line, len, 1, stdout);
419 puts(reset);
420 }
421
422 static void emit_line_with_ws(int nparents,
423 const char *set, const char *reset, const char *ws,
424 const char *line, int len)
425 {
426 int col0 = nparents;
427 int last_tab_in_indent = -1;
428 int last_space_in_indent = -1;
429 int i;
430 int tail = len;
431 int need_highlight_leading_space = 0;
432 /* The line is a newly added line. Does it have funny leading
433 * whitespaces? In indent, SP should never precede a TAB.
434 */
435 for (i = col0; i < len; i++) {
436 if (line[i] == '\t') {
437 last_tab_in_indent = i;
438 if (0 <= last_space_in_indent)
439 need_highlight_leading_space = 1;
440 }
441 else if (line[i] == ' ')
442 last_space_in_indent = i;
443 else
444 break;
445 }
446 fputs(set, stdout);
447 fwrite(line, col0, 1, stdout);
448 fputs(reset, stdout);
449 if (((i == len) || line[i] == '\n') && i != col0) {
450 /* The whole line was indent */
451 emit_line(ws, reset, line + col0, len - col0);
452 return;
453 }
454 i = col0;
455 if (need_highlight_leading_space) {
456 while (i < last_tab_in_indent) {
457 if (line[i] == ' ') {
458 fputs(ws, stdout);
459 putchar(' ');
460 fputs(reset, stdout);
461 }
462 else
463 putchar(line[i]);
464 i++;
465 }
466 }
467 tail = len - 1;
468 if (line[tail] == '\n' && i < tail)
469 tail--;
470 while (i < tail) {
471 if (!isspace(line[tail]))
472 break;
473 tail--;
474 }
475 if ((i < tail && line[tail + 1] != '\n')) {
476 /* This has whitespace between tail+1..len */
477 fputs(set, stdout);
478 fwrite(line + i, tail - i + 1, 1, stdout);
479 fputs(reset, stdout);
480 emit_line(ws, reset, line + tail + 1, len - tail - 1);
481 }
482 else
483 emit_line(set, reset, line + i, len - i);
484 }
485
486 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
487 {
488 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
489 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
490
491 if (!*ws)
492 emit_line(set, reset, line, len);
493 else
494 emit_line_with_ws(ecbdata->nparents, set, reset, ws,
495 line, len);
496 }
497
498 static void fn_out_consume(void *priv, char *line, unsigned long len)
499 {
500 int i;
501 int color;
502 struct emit_callback *ecbdata = priv;
503 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
504 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
505
506 *(ecbdata->found_changesp) = 1;
507
508 if (ecbdata->label_path[0]) {
509 const char *name_a_tab, *name_b_tab;
510
511 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
512 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
513
514 printf("%s--- %s%s%s\n",
515 set, ecbdata->label_path[0], reset, name_a_tab);
516 printf("%s+++ %s%s%s\n",
517 set, ecbdata->label_path[1], reset, name_b_tab);
518 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
519 }
520
521 /* This is not really necessary for now because
522 * this codepath only deals with two-way diffs.
523 */
524 for (i = 0; i < len && line[i] == '@'; i++)
525 ;
526 if (2 <= i && i < len && line[i] == ' ') {
527 ecbdata->nparents = i - 1;
528 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
529 reset, line, len);
530 return;
531 }
532
533 if (len < ecbdata->nparents) {
534 set = reset;
535 emit_line(reset, reset, line, len);
536 return;
537 }
538
539 color = DIFF_PLAIN;
540 if (ecbdata->diff_words && ecbdata->nparents != 1)
541 /* fall back to normal diff */
542 free_diff_words_data(ecbdata);
543 if (ecbdata->diff_words) {
544 if (line[0] == '-') {
545 diff_words_append(line, len,
546 &ecbdata->diff_words->minus);
547 return;
548 } else if (line[0] == '+') {
549 diff_words_append(line, len,
550 &ecbdata->diff_words->plus);
551 return;
552 }
553 if (ecbdata->diff_words->minus.text.size ||
554 ecbdata->diff_words->plus.text.size)
555 diff_words_show(ecbdata->diff_words);
556 line++;
557 len--;
558 emit_line(set, reset, line, len);
559 return;
560 }
561 for (i = 0; i < ecbdata->nparents && len; i++) {
562 if (line[i] == '-')
563 color = DIFF_FILE_OLD;
564 else if (line[i] == '+')
565 color = DIFF_FILE_NEW;
566 }
567
568 if (color != DIFF_FILE_NEW) {
569 emit_line(diff_get_color(ecbdata->color_diff, color),
570 reset, line, len);
571 return;
572 }
573 emit_add_line(reset, ecbdata, line, len);
574 }
575
576 static char *pprint_rename(const char *a, const char *b)
577 {
578 const char *old = a;
579 const char *new = b;
580 char *name = NULL;
581 int pfx_length, sfx_length;
582 int len_a = strlen(a);
583 int len_b = strlen(b);
584 int qlen_a = quote_c_style(a, NULL, NULL, 0);
585 int qlen_b = quote_c_style(b, NULL, NULL, 0);
586
587 if (qlen_a || qlen_b) {
588 if (qlen_a) len_a = qlen_a;
589 if (qlen_b) len_b = qlen_b;
590 name = xmalloc( len_a + len_b + 5 );
591 if (qlen_a)
592 quote_c_style(a, name, NULL, 0);
593 else
594 memcpy(name, a, len_a);
595 memcpy(name + len_a, " => ", 4);
596 if (qlen_b)
597 quote_c_style(b, name + len_a + 4, NULL, 0);
598 else
599 memcpy(name + len_a + 4, b, len_b + 1);
600 return name;
601 }
602
603 /* Find common prefix */
604 pfx_length = 0;
605 while (*old && *new && *old == *new) {
606 if (*old == '/')
607 pfx_length = old - a + 1;
608 old++;
609 new++;
610 }
611
612 /* Find common suffix */
613 old = a + len_a;
614 new = b + len_b;
615 sfx_length = 0;
616 while (a <= old && b <= new && *old == *new) {
617 if (*old == '/')
618 sfx_length = len_a - (old - a);
619 old--;
620 new--;
621 }
622
623 /*
624 * pfx{mid-a => mid-b}sfx
625 * {pfx-a => pfx-b}sfx
626 * pfx{sfx-a => sfx-b}
627 * name-a => name-b
628 */
629 if (pfx_length + sfx_length) {
630 int a_midlen = len_a - pfx_length - sfx_length;
631 int b_midlen = len_b - pfx_length - sfx_length;
632 if (a_midlen < 0) a_midlen = 0;
633 if (b_midlen < 0) b_midlen = 0;
634
635 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
636 sprintf(name, "%.*s{%.*s => %.*s}%s",
637 pfx_length, a,
638 a_midlen, a + pfx_length,
639 b_midlen, b + pfx_length,
640 a + len_a - sfx_length);
641 }
642 else {
643 name = xmalloc(len_a + len_b + 5);
644 sprintf(name, "%s => %s", a, b);
645 }
646 return name;
647 }
648
649 struct diffstat_t {
650 struct xdiff_emit_state xm;
651
652 int nr;
653 int alloc;
654 struct diffstat_file {
655 char *name;
656 unsigned is_unmerged:1;
657 unsigned is_binary:1;
658 unsigned is_renamed:1;
659 unsigned int added, deleted;
660 } **files;
661 };
662
663 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
664 const char *name_a,
665 const char *name_b)
666 {
667 struct diffstat_file *x;
668 x = xcalloc(sizeof (*x), 1);
669 if (diffstat->nr == diffstat->alloc) {
670 diffstat->alloc = alloc_nr(diffstat->alloc);
671 diffstat->files = xrealloc(diffstat->files,
672 diffstat->alloc * sizeof(x));
673 }
674 diffstat->files[diffstat->nr++] = x;
675 if (name_b) {
676 x->name = pprint_rename(name_a, name_b);
677 x->is_renamed = 1;
678 }
679 else
680 x->name = xstrdup(name_a);
681 return x;
682 }
683
684 static void diffstat_consume(void *priv, char *line, unsigned long len)
685 {
686 struct diffstat_t *diffstat = priv;
687 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
688
689 if (line[0] == '+')
690 x->added++;
691 else if (line[0] == '-')
692 x->deleted++;
693 }
694
695 const char mime_boundary_leader[] = "------------";
696
697 static int scale_linear(int it, int width, int max_change)
698 {
699 /*
700 * make sure that at least one '-' is printed if there were deletions,
701 * and likewise for '+'.
702 */
703 if (max_change < 2)
704 return it;
705 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
706 }
707
708 static void show_name(const char *prefix, const char *name, int len,
709 const char *reset, const char *set)
710 {
711 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
712 }
713
714 static void show_graph(char ch, int cnt, const char *set, const char *reset)
715 {
716 if (cnt <= 0)
717 return;
718 printf("%s", set);
719 while (cnt--)
720 putchar(ch);
721 printf("%s", reset);
722 }
723
724 static void show_stats(struct diffstat_t* data, struct diff_options *options)
725 {
726 int i, len, add, del, total, adds = 0, dels = 0;
727 int max_change = 0, max_len = 0;
728 int total_files = data->nr;
729 int width, name_width;
730 const char *reset, *set, *add_c, *del_c;
731
732 if (data->nr == 0)
733 return;
734
735 width = options->stat_width ? options->stat_width : 80;
736 name_width = options->stat_name_width ? options->stat_name_width : 50;
737
738 /* Sanity: give at least 5 columns to the graph,
739 * but leave at least 10 columns for the name.
740 */
741 if (width < name_width + 15) {
742 if (name_width <= 25)
743 width = name_width + 15;
744 else
745 name_width = width - 15;
746 }
747
748 /* Find the longest filename and max number of changes */
749 reset = diff_get_color(options->color_diff, DIFF_RESET);
750 set = diff_get_color(options->color_diff, DIFF_PLAIN);
751 add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
752 del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
753
754 for (i = 0; i < data->nr; i++) {
755 struct diffstat_file *file = data->files[i];
756 int change = file->added + file->deleted;
757
758 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
759 len = quote_c_style(file->name, NULL, NULL, 0);
760 if (len) {
761 char *qname = xmalloc(len + 1);
762 quote_c_style(file->name, qname, NULL, 0);
763 free(file->name);
764 file->name = qname;
765 }
766 }
767
768 len = strlen(file->name);
769 if (max_len < len)
770 max_len = len;
771
772 if (file->is_binary || file->is_unmerged)
773 continue;
774 if (max_change < change)
775 max_change = change;
776 }
777
778 /* Compute the width of the graph part;
779 * 10 is for one blank at the beginning of the line plus
780 * " | count " between the name and the graph.
781 *
782 * From here on, name_width is the width of the name area,
783 * and width is the width of the graph area.
784 */
785 name_width = (name_width < max_len) ? name_width : max_len;
786 if (width < (name_width + 10) + max_change)
787 width = width - (name_width + 10);
788 else
789 width = max_change;
790
791 for (i = 0; i < data->nr; i++) {
792 const char *prefix = "";
793 char *name = data->files[i]->name;
794 int added = data->files[i]->added;
795 int deleted = data->files[i]->deleted;
796 int name_len;
797
798 /*
799 * "scale" the filename
800 */
801 len = name_width;
802 name_len = strlen(name);
803 if (name_width < name_len) {
804 char *slash;
805 prefix = "...";
806 len -= 3;
807 name += name_len - len;
808 slash = strchr(name, '/');
809 if (slash)
810 name = slash;
811 }
812
813 if (data->files[i]->is_binary) {
814 show_name(prefix, name, len, reset, set);
815 printf(" Bin ");
816 printf("%s%d%s", del_c, deleted, reset);
817 printf(" -> ");
818 printf("%s%d%s", add_c, added, reset);
819 printf(" bytes");
820 printf("\n");
821 goto free_diffstat_file;
822 }
823 else if (data->files[i]->is_unmerged) {
824 show_name(prefix, name, len, reset, set);
825 printf(" Unmerged\n");
826 goto free_diffstat_file;
827 }
828 else if (!data->files[i]->is_renamed &&
829 (added + deleted == 0)) {
830 total_files--;
831 goto free_diffstat_file;
832 }
833
834 /*
835 * scale the add/delete
836 */
837 add = added;
838 del = deleted;
839 total = add + del;
840 adds += add;
841 dels += del;
842
843 if (width <= max_change) {
844 add = scale_linear(add, width, max_change);
845 del = scale_linear(del, width, max_change);
846 total = add + del;
847 }
848 show_name(prefix, name, len, reset, set);
849 printf("%5d ", added + deleted);
850 show_graph('+', add, add_c, reset);
851 show_graph('-', del, del_c, reset);
852 putchar('\n');
853 free_diffstat_file:
854 free(data->files[i]->name);
855 free(data->files[i]);
856 }
857 free(data->files);
858 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
859 set, total_files, adds, dels, reset);
860 }
861
862 static void show_shortstats(struct diffstat_t* data)
863 {
864 int i, adds = 0, dels = 0, total_files = data->nr;
865
866 if (data->nr == 0)
867 return;
868
869 for (i = 0; i < data->nr; i++) {
870 if (!data->files[i]->is_binary &&
871 !data->files[i]->is_unmerged) {
872 int added = data->files[i]->added;
873 int deleted= data->files[i]->deleted;
874 if (!data->files[i]->is_renamed &&
875 (added + deleted == 0)) {
876 total_files--;
877 } else {
878 adds += added;
879 dels += deleted;
880 }
881 }
882 free(data->files[i]->name);
883 free(data->files[i]);
884 }
885 free(data->files);
886
887 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
888 total_files, adds, dels);
889 }
890
891 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
892 {
893 int i;
894
895 for (i = 0; i < data->nr; i++) {
896 struct diffstat_file *file = data->files[i];
897
898 if (file->is_binary)
899 printf("-\t-\t");
900 else
901 printf("%d\t%d\t", file->added, file->deleted);
902 if (options->line_termination && !file->is_renamed &&
903 quote_c_style(file->name, NULL, NULL, 0))
904 quote_c_style(file->name, NULL, stdout, 0);
905 else
906 fputs(file->name, stdout);
907 putchar(options->line_termination);
908 }
909 }
910
911 struct checkdiff_t {
912 struct xdiff_emit_state xm;
913 const char *filename;
914 int lineno, color_diff;
915 };
916
917 static void checkdiff_consume(void *priv, char *line, unsigned long len)
918 {
919 struct checkdiff_t *data = priv;
920 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
921 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
922 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
923
924 if (line[0] == '+') {
925 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
926
927 /* check space before tab */
928 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
929 if (line[i] == ' ')
930 spaces++;
931 if (line[i - 1] == '\t' && spaces)
932 space_before_tab = 1;
933
934 /* check white space at line end */
935 if (line[len - 1] == '\n')
936 len--;
937 if (isspace(line[len - 1]))
938 white_space_at_end = 1;
939
940 if (space_before_tab || white_space_at_end) {
941 printf("%s:%d: %s", data->filename, data->lineno, ws);
942 if (space_before_tab) {
943 printf("space before tab");
944 if (white_space_at_end)
945 putchar(',');
946 }
947 if (white_space_at_end)
948 printf("white space at end");
949 printf(":%s ", reset);
950 emit_line_with_ws(1, set, reset, ws, line, len);
951 }
952
953 data->lineno++;
954 } else if (line[0] == ' ')
955 data->lineno++;
956 else if (line[0] == '@') {
957 char *plus = strchr(line, '+');
958 if (plus)
959 data->lineno = strtol(plus, NULL, 10);
960 else
961 die("invalid diff");
962 }
963 }
964
965 static unsigned char *deflate_it(char *data,
966 unsigned long size,
967 unsigned long *result_size)
968 {
969 int bound;
970 unsigned char *deflated;
971 z_stream stream;
972
973 memset(&stream, 0, sizeof(stream));
974 deflateInit(&stream, zlib_compression_level);
975 bound = deflateBound(&stream, size);
976 deflated = xmalloc(bound);
977 stream.next_out = deflated;
978 stream.avail_out = bound;
979
980 stream.next_in = (unsigned char *)data;
981 stream.avail_in = size;
982 while (deflate(&stream, Z_FINISH) == Z_OK)
983 ; /* nothing */
984 deflateEnd(&stream);
985 *result_size = stream.total_out;
986 return deflated;
987 }
988
989 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
990 {
991 void *cp;
992 void *delta;
993 void *deflated;
994 void *data;
995 unsigned long orig_size;
996 unsigned long delta_size;
997 unsigned long deflate_size;
998 unsigned long data_size;
999
1000 /* We could do deflated delta, or we could do just deflated two,
1001 * whichever is smaller.
1002 */
1003 delta = NULL;
1004 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1005 if (one->size && two->size) {
1006 delta = diff_delta(one->ptr, one->size,
1007 two->ptr, two->size,
1008 &delta_size, deflate_size);
1009 if (delta) {
1010 void *to_free = delta;
1011 orig_size = delta_size;
1012 delta = deflate_it(delta, delta_size, &delta_size);
1013 free(to_free);
1014 }
1015 }
1016
1017 if (delta && delta_size < deflate_size) {
1018 printf("delta %lu\n", orig_size);
1019 free(deflated);
1020 data = delta;
1021 data_size = delta_size;
1022 }
1023 else {
1024 printf("literal %lu\n", two->size);
1025 free(delta);
1026 data = deflated;
1027 data_size = deflate_size;
1028 }
1029
1030 /* emit data encoded in base85 */
1031 cp = data;
1032 while (data_size) {
1033 int bytes = (52 < data_size) ? 52 : data_size;
1034 char line[70];
1035 data_size -= bytes;
1036 if (bytes <= 26)
1037 line[0] = bytes + 'A' - 1;
1038 else
1039 line[0] = bytes - 26 + 'a' - 1;
1040 encode_85(line + 1, cp, bytes);
1041 cp = (char *) cp + bytes;
1042 puts(line);
1043 }
1044 printf("\n");
1045 free(data);
1046 }
1047
1048 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1049 {
1050 printf("GIT binary patch\n");
1051 emit_binary_diff_body(one, two);
1052 emit_binary_diff_body(two, one);
1053 }
1054
1055 static void setup_diff_attr_check(struct git_attr_check *check)
1056 {
1057 static struct git_attr *attr_diff;
1058
1059 if (!attr_diff)
1060 attr_diff = git_attr("diff", 4);
1061 check->attr = attr_diff;
1062 }
1063
1064 #define FIRST_FEW_BYTES 8000
1065 static int file_is_binary(struct diff_filespec *one)
1066 {
1067 unsigned long sz;
1068 struct git_attr_check attr_diff_check;
1069
1070 setup_diff_attr_check(&attr_diff_check);
1071 if (!git_checkattr(one->path, 1, &attr_diff_check) &&
1072 (0 <= attr_diff_check.isset))
1073 return !attr_diff_check.isset;
1074
1075 if (!one->data) {
1076 if (!DIFF_FILE_VALID(one))
1077 return 0;
1078 diff_populate_filespec(one, 0);
1079 }
1080 sz = one->size;
1081 if (FIRST_FEW_BYTES < sz)
1082 sz = FIRST_FEW_BYTES;
1083 return !!memchr(one->data, 0, sz);
1084 }
1085
1086 static void builtin_diff(const char *name_a,
1087 const char *name_b,
1088 struct diff_filespec *one,
1089 struct diff_filespec *two,
1090 const char *xfrm_msg,
1091 struct diff_options *o,
1092 int complete_rewrite)
1093 {
1094 mmfile_t mf1, mf2;
1095 const char *lbl[2];
1096 char *a_one, *b_two;
1097 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1098 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
1099
1100 a_one = quote_two("a/", name_a + (*name_a == '/'));
1101 b_two = quote_two("b/", name_b + (*name_b == '/'));
1102 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1103 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1104 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1105 if (lbl[0][0] == '/') {
1106 /* /dev/null */
1107 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1108 if (xfrm_msg && xfrm_msg[0])
1109 printf("%s%s%s\n", set, xfrm_msg, reset);
1110 }
1111 else if (lbl[1][0] == '/') {
1112 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1113 if (xfrm_msg && xfrm_msg[0])
1114 printf("%s%s%s\n", set, xfrm_msg, reset);
1115 }
1116 else {
1117 if (one->mode != two->mode) {
1118 printf("%sold mode %06o%s\n", set, one->mode, reset);
1119 printf("%snew mode %06o%s\n", set, two->mode, reset);
1120 }
1121 if (xfrm_msg && xfrm_msg[0])
1122 printf("%s%s%s\n", set, xfrm_msg, reset);
1123 /*
1124 * we do not run diff between different kind
1125 * of objects.
1126 */
1127 if ((one->mode ^ two->mode) & S_IFMT)
1128 goto free_ab_and_return;
1129 if (complete_rewrite) {
1130 emit_rewrite_diff(name_a, name_b, one, two,
1131 o->color_diff);
1132 o->found_changes = 1;
1133 goto free_ab_and_return;
1134 }
1135 }
1136
1137 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1138 die("unable to read files to diff");
1139
1140 if (!o->text && (file_is_binary(one) || file_is_binary(two))) {
1141 /* Quite common confusing case */
1142 if (mf1.size == mf2.size &&
1143 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1144 goto free_ab_and_return;
1145 if (o->binary)
1146 emit_binary_diff(&mf1, &mf2);
1147 else
1148 printf("Binary files %s and %s differ\n",
1149 lbl[0], lbl[1]);
1150 o->found_changes = 1;
1151 }
1152 else {
1153 /* Crazy xdl interfaces.. */
1154 const char *diffopts = getenv("GIT_DIFF_OPTS");
1155 xpparam_t xpp;
1156 xdemitconf_t xecfg;
1157 xdemitcb_t ecb;
1158 struct emit_callback ecbdata;
1159
1160 memset(&ecbdata, 0, sizeof(ecbdata));
1161 ecbdata.label_path = lbl;
1162 ecbdata.color_diff = o->color_diff;
1163 ecbdata.found_changesp = &o->found_changes;
1164 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1165 xecfg.ctxlen = o->context;
1166 xecfg.flags = XDL_EMIT_FUNCNAMES;
1167 if (!diffopts)
1168 ;
1169 else if (!prefixcmp(diffopts, "--unified="))
1170 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1171 else if (!prefixcmp(diffopts, "-u"))
1172 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1173 ecb.outf = xdiff_outf;
1174 ecb.priv = &ecbdata;
1175 ecbdata.xm.consume = fn_out_consume;
1176 if (o->color_diff_words)
1177 ecbdata.diff_words =
1178 xcalloc(1, sizeof(struct diff_words_data));
1179 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1180 if (o->color_diff_words)
1181 free_diff_words_data(&ecbdata);
1182 }
1183
1184 free_ab_and_return:
1185 free(a_one);
1186 free(b_two);
1187 return;
1188 }
1189
1190 static void builtin_diffstat(const char *name_a, const char *name_b,
1191 struct diff_filespec *one,
1192 struct diff_filespec *two,
1193 struct diffstat_t *diffstat,
1194 struct diff_options *o,
1195 int complete_rewrite)
1196 {
1197 mmfile_t mf1, mf2;
1198 struct diffstat_file *data;
1199
1200 data = diffstat_add(diffstat, name_a, name_b);
1201
1202 if (!one || !two) {
1203 data->is_unmerged = 1;
1204 return;
1205 }
1206 if (complete_rewrite) {
1207 diff_populate_filespec(one, 0);
1208 diff_populate_filespec(two, 0);
1209 data->deleted = count_lines(one->data, one->size);
1210 data->added = count_lines(two->data, two->size);
1211 return;
1212 }
1213 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1214 die("unable to read files to diff");
1215
1216 if (file_is_binary(one) || file_is_binary(two)) {
1217 data->is_binary = 1;
1218 data->added = mf2.size;
1219 data->deleted = mf1.size;
1220 } else {
1221 /* Crazy xdl interfaces.. */
1222 xpparam_t xpp;
1223 xdemitconf_t xecfg;
1224 xdemitcb_t ecb;
1225
1226 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1227 xecfg.ctxlen = 0;
1228 xecfg.flags = 0;
1229 ecb.outf = xdiff_outf;
1230 ecb.priv = diffstat;
1231 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1232 }
1233 }
1234
1235 static void builtin_checkdiff(const char *name_a, const char *name_b,
1236 struct diff_filespec *one,
1237 struct diff_filespec *two, struct diff_options *o)
1238 {
1239 mmfile_t mf1, mf2;
1240 struct checkdiff_t data;
1241
1242 if (!two)
1243 return;
1244
1245 memset(&data, 0, sizeof(data));
1246 data.xm.consume = checkdiff_consume;
1247 data.filename = name_b ? name_b : name_a;
1248 data.lineno = 0;
1249 data.color_diff = o->color_diff;
1250
1251 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1252 die("unable to read files to diff");
1253
1254 if (file_is_binary(two))
1255 return;
1256 else {
1257 /* Crazy xdl interfaces.. */
1258 xpparam_t xpp;
1259 xdemitconf_t xecfg;
1260 xdemitcb_t ecb;
1261
1262 xpp.flags = XDF_NEED_MINIMAL;
1263 xecfg.ctxlen = 0;
1264 xecfg.flags = 0;
1265 ecb.outf = xdiff_outf;
1266 ecb.priv = &data;
1267 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1268 }
1269 }
1270
1271 struct diff_filespec *alloc_filespec(const char *path)
1272 {
1273 int namelen = strlen(path);
1274 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1275
1276 memset(spec, 0, sizeof(*spec));
1277 spec->path = (char *)(spec + 1);
1278 memcpy(spec->path, path, namelen+1);
1279 return spec;
1280 }
1281
1282 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1283 unsigned short mode)
1284 {
1285 if (mode) {
1286 spec->mode = canon_mode(mode);
1287 hashcpy(spec->sha1, sha1);
1288 spec->sha1_valid = !is_null_sha1(sha1);
1289 }
1290 }
1291
1292 /*
1293 * Given a name and sha1 pair, if the dircache tells us the file in
1294 * the work tree has that object contents, return true, so that
1295 * prepare_temp_file() does not have to inflate and extract.
1296 */
1297 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1298 {
1299 struct cache_entry *ce;
1300 struct stat st;
1301 int pos, len;
1302
1303 /* We do not read the cache ourselves here, because the
1304 * benchmark with my previous version that always reads cache
1305 * shows that it makes things worse for diff-tree comparing
1306 * two linux-2.6 kernel trees in an already checked out work
1307 * tree. This is because most diff-tree comparisons deal with
1308 * only a small number of files, while reading the cache is
1309 * expensive for a large project, and its cost outweighs the
1310 * savings we get by not inflating the object to a temporary
1311 * file. Practically, this code only helps when we are used
1312 * by diff-cache --cached, which does read the cache before
1313 * calling us.
1314 */
1315 if (!active_cache)
1316 return 0;
1317
1318 /* We want to avoid the working directory if our caller
1319 * doesn't need the data in a normal file, this system
1320 * is rather slow with its stat/open/mmap/close syscalls,
1321 * and the object is contained in a pack file. The pack
1322 * is probably already open and will be faster to obtain
1323 * the data through than the working directory. Loose
1324 * objects however would tend to be slower as they need
1325 * to be individually opened and inflated.
1326 */
1327 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1328 return 0;
1329
1330 len = strlen(name);
1331 pos = cache_name_pos(name, len);
1332 if (pos < 0)
1333 return 0;
1334 ce = active_cache[pos];
1335 if ((lstat(name, &st) < 0) ||
1336 !S_ISREG(st.st_mode) || /* careful! */
1337 ce_match_stat(ce, &st, 0) ||
1338 hashcmp(sha1, ce->sha1))
1339 return 0;
1340 /* we return 1 only when we can stat, it is a regular file,
1341 * stat information matches, and sha1 recorded in the cache
1342 * matches. I.e. we know the file in the work tree really is
1343 * the same as the <name, sha1> pair.
1344 */
1345 return 1;
1346 }
1347
1348 static struct sha1_size_cache {
1349 unsigned char sha1[20];
1350 unsigned long size;
1351 } **sha1_size_cache;
1352 static int sha1_size_cache_nr, sha1_size_cache_alloc;
1353
1354 static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
1355 int find_only,
1356 unsigned long size)
1357 {
1358 int first, last;
1359 struct sha1_size_cache *e;
1360
1361 first = 0;
1362 last = sha1_size_cache_nr;
1363 while (last > first) {
1364 int cmp, next = (last + first) >> 1;
1365 e = sha1_size_cache[next];
1366 cmp = hashcmp(e->sha1, sha1);
1367 if (!cmp)
1368 return e;
1369 if (cmp < 0) {
1370 last = next;
1371 continue;
1372 }
1373 first = next+1;
1374 }
1375 /* not found */
1376 if (find_only)
1377 return NULL;
1378 /* insert to make it at "first" */
1379 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
1380 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
1381 sha1_size_cache = xrealloc(sha1_size_cache,
1382 sha1_size_cache_alloc *
1383 sizeof(*sha1_size_cache));
1384 }
1385 sha1_size_cache_nr++;
1386 if (first < sha1_size_cache_nr)
1387 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
1388 (sha1_size_cache_nr - first - 1) *
1389 sizeof(*sha1_size_cache));
1390 e = xmalloc(sizeof(struct sha1_size_cache));
1391 sha1_size_cache[first] = e;
1392 hashcpy(e->sha1, sha1);
1393 e->size = size;
1394 return e;
1395 }
1396
1397 static int populate_from_stdin(struct diff_filespec *s)
1398 {
1399 #define INCREMENT 1024
1400 char *buf;
1401 unsigned long size;
1402 int got;
1403
1404 size = 0;
1405 buf = NULL;
1406 while (1) {
1407 buf = xrealloc(buf, size + INCREMENT);
1408 got = xread(0, buf + size, INCREMENT);
1409 if (!got)
1410 break; /* EOF */
1411 if (got < 0)
1412 return error("error while reading from stdin %s",
1413 strerror(errno));
1414 size += got;
1415 }
1416 s->should_munmap = 0;
1417 s->data = buf;
1418 s->size = size;
1419 s->should_free = 1;
1420 return 0;
1421 }
1422
1423 /*
1424 * While doing rename detection and pickaxe operation, we may need to
1425 * grab the data for the blob (or file) for our own in-core comparison.
1426 * diff_filespec has data and size fields for this purpose.
1427 */
1428 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1429 {
1430 int err = 0;
1431 if (!DIFF_FILE_VALID(s))
1432 die("internal error: asking to populate invalid file.");
1433 if (S_ISDIR(s->mode))
1434 return -1;
1435
1436 if (!use_size_cache)
1437 size_only = 0;
1438
1439 if (s->data)
1440 return err;
1441 if (!s->sha1_valid ||
1442 reuse_worktree_file(s->path, s->sha1, 0)) {
1443 struct stat st;
1444 int fd;
1445 char *buf;
1446 unsigned long size;
1447
1448 if (!strcmp(s->path, "-"))
1449 return populate_from_stdin(s);
1450
1451 if (lstat(s->path, &st) < 0) {
1452 if (errno == ENOENT) {
1453 err_empty:
1454 err = -1;
1455 empty:
1456 s->data = (char *)"";
1457 s->size = 0;
1458 return err;
1459 }
1460 }
1461 s->size = xsize_t(st.st_size);
1462 if (!s->size)
1463 goto empty;
1464 if (size_only)
1465 return 0;
1466 if (S_ISLNK(st.st_mode)) {
1467 int ret;
1468 s->data = xmalloc(s->size);
1469 s->should_free = 1;
1470 ret = readlink(s->path, s->data, s->size);
1471 if (ret < 0) {
1472 free(s->data);
1473 goto err_empty;
1474 }
1475 return 0;
1476 }
1477 fd = open(s->path, O_RDONLY);
1478 if (fd < 0)
1479 goto err_empty;
1480 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1481 close(fd);
1482 s->should_munmap = 1;
1483
1484 /*
1485 * Convert from working tree format to canonical git format
1486 */
1487 buf = s->data;
1488 size = s->size;
1489 if (convert_to_git(s->path, &buf, &size)) {
1490 munmap(s->data, s->size);
1491 s->should_munmap = 0;
1492 s->data = buf;
1493 s->size = size;
1494 s->should_free = 1;
1495 }
1496 }
1497 else {
1498 enum object_type type;
1499 struct sha1_size_cache *e;
1500
1501 if (size_only) {
1502 e = locate_size_cache(s->sha1, 1, 0);
1503 if (e) {
1504 s->size = e->size;
1505 return 0;
1506 }
1507 type = sha1_object_info(s->sha1, &s->size);
1508 if (type < 0)
1509 locate_size_cache(s->sha1, 0, s->size);
1510 }
1511 else {
1512 s->data = read_sha1_file(s->sha1, &type, &s->size);
1513 s->should_free = 1;
1514 }
1515 }
1516 return 0;
1517 }
1518
1519 void diff_free_filespec_data(struct diff_filespec *s)
1520 {
1521 if (s->should_free)
1522 free(s->data);
1523 else if (s->should_munmap)
1524 munmap(s->data, s->size);
1525 s->should_free = s->should_munmap = 0;
1526 s->data = NULL;
1527 free(s->cnt_data);
1528 s->cnt_data = NULL;
1529 }
1530
1531 static void prep_temp_blob(struct diff_tempfile *temp,
1532 void *blob,
1533 unsigned long size,
1534 const unsigned char *sha1,
1535 int mode)
1536 {
1537 int fd;
1538
1539 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
1540 if (fd < 0)
1541 die("unable to create temp-file");
1542 if (write_in_full(fd, blob, size) != size)
1543 die("unable to write temp-file");
1544 close(fd);
1545 temp->name = temp->tmp_path;
1546 strcpy(temp->hex, sha1_to_hex(sha1));
1547 temp->hex[40] = 0;
1548 sprintf(temp->mode, "%06o", mode);
1549 }
1550
1551 static void prepare_temp_file(const char *name,
1552 struct diff_tempfile *temp,
1553 struct diff_filespec *one)
1554 {
1555 if (!DIFF_FILE_VALID(one)) {
1556 not_a_valid_file:
1557 /* A '-' entry produces this for file-2, and
1558 * a '+' entry produces this for file-1.
1559 */
1560 temp->name = "/dev/null";
1561 strcpy(temp->hex, ".");
1562 strcpy(temp->mode, ".");
1563 return;
1564 }
1565
1566 if (!one->sha1_valid ||
1567 reuse_worktree_file(name, one->sha1, 1)) {
1568 struct stat st;
1569 if (lstat(name, &st) < 0) {
1570 if (errno == ENOENT)
1571 goto not_a_valid_file;
1572 die("stat(%s): %s", name, strerror(errno));
1573 }
1574 if (S_ISLNK(st.st_mode)) {
1575 int ret;
1576 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1577 size_t sz = xsize_t(st.st_size);
1578 if (sizeof(buf) <= st.st_size)
1579 die("symlink too long: %s", name);
1580 ret = readlink(name, buf, sz);
1581 if (ret < 0)
1582 die("readlink(%s)", name);
1583 prep_temp_blob(temp, buf, sz,
1584 (one->sha1_valid ?
1585 one->sha1 : null_sha1),
1586 (one->sha1_valid ?
1587 one->mode : S_IFLNK));
1588 }
1589 else {
1590 /* we can borrow from the file in the work tree */
1591 temp->name = name;
1592 if (!one->sha1_valid)
1593 strcpy(temp->hex, sha1_to_hex(null_sha1));
1594 else
1595 strcpy(temp->hex, sha1_to_hex(one->sha1));
1596 /* Even though we may sometimes borrow the
1597 * contents from the work tree, we always want
1598 * one->mode. mode is trustworthy even when
1599 * !(one->sha1_valid), as long as
1600 * DIFF_FILE_VALID(one).
1601 */
1602 sprintf(temp->mode, "%06o", one->mode);
1603 }
1604 return;
1605 }
1606 else {
1607 if (diff_populate_filespec(one, 0))
1608 die("cannot read data blob for %s", one->path);
1609 prep_temp_blob(temp, one->data, one->size,
1610 one->sha1, one->mode);
1611 }
1612 }
1613
1614 static void remove_tempfile(void)
1615 {
1616 int i;
1617
1618 for (i = 0; i < 2; i++)
1619 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1620 unlink(diff_temp[i].name);
1621 diff_temp[i].name = NULL;
1622 }
1623 }
1624
1625 static void remove_tempfile_on_signal(int signo)
1626 {
1627 remove_tempfile();
1628 signal(SIGINT, SIG_DFL);
1629 raise(signo);
1630 }
1631
1632 static int spawn_prog(const char *pgm, const char **arg)
1633 {
1634 pid_t pid;
1635 int status;
1636
1637 fflush(NULL);
1638 pid = fork();
1639 if (pid < 0)
1640 die("unable to fork");
1641 if (!pid) {
1642 execvp(pgm, (char *const*) arg);
1643 exit(255);
1644 }
1645
1646 while (waitpid(pid, &status, 0) < 0) {
1647 if (errno == EINTR)
1648 continue;
1649 return -1;
1650 }
1651
1652 /* Earlier we did not check the exit status because
1653 * diff exits non-zero if files are different, and
1654 * we are not interested in knowing that. It was a
1655 * mistake which made it harder to quit a diff-*
1656 * session that uses the git-apply-patch-script as
1657 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1658 * should also exit non-zero only when it wants to
1659 * abort the entire diff-* session.
1660 */
1661 if (WIFEXITED(status) && !WEXITSTATUS(status))
1662 return 0;
1663 return -1;
1664 }
1665
1666 /* An external diff command takes:
1667 *
1668 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1669 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1670 *
1671 */
1672 static void run_external_diff(const char *pgm,
1673 const char *name,
1674 const char *other,
1675 struct diff_filespec *one,
1676 struct diff_filespec *two,
1677 const char *xfrm_msg,
1678 int complete_rewrite)
1679 {
1680 const char *spawn_arg[10];
1681 struct diff_tempfile *temp = diff_temp;
1682 int retval;
1683 static int atexit_asked = 0;
1684 const char *othername;
1685 const char **arg = &spawn_arg[0];
1686
1687 othername = (other? other : name);
1688 if (one && two) {
1689 prepare_temp_file(name, &temp[0], one);
1690 prepare_temp_file(othername, &temp[1], two);
1691 if (! atexit_asked &&
1692 (temp[0].name == temp[0].tmp_path ||
1693 temp[1].name == temp[1].tmp_path)) {
1694 atexit_asked = 1;
1695 atexit(remove_tempfile);
1696 }
1697 signal(SIGINT, remove_tempfile_on_signal);
1698 }
1699
1700 if (one && two) {
1701 *arg++ = pgm;
1702 *arg++ = name;
1703 *arg++ = temp[0].name;
1704 *arg++ = temp[0].hex;
1705 *arg++ = temp[0].mode;
1706 *arg++ = temp[1].name;
1707 *arg++ = temp[1].hex;
1708 *arg++ = temp[1].mode;
1709 if (other) {
1710 *arg++ = other;
1711 *arg++ = xfrm_msg;
1712 }
1713 } else {
1714 *arg++ = pgm;
1715 *arg++ = name;
1716 }
1717 *arg = NULL;
1718 retval = spawn_prog(pgm, spawn_arg);
1719 remove_tempfile();
1720 if (retval) {
1721 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1722 exit(1);
1723 }
1724 }
1725
1726 static void run_diff_cmd(const char *pgm,
1727 const char *name,
1728 const char *other,
1729 struct diff_filespec *one,
1730 struct diff_filespec *two,
1731 const char *xfrm_msg,
1732 struct diff_options *o,
1733 int complete_rewrite)
1734 {
1735 if (pgm) {
1736 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1737 complete_rewrite);
1738 return;
1739 }
1740 if (one && two)
1741 builtin_diff(name, other ? other : name,
1742 one, two, xfrm_msg, o, complete_rewrite);
1743 else
1744 printf("* Unmerged path %s\n", name);
1745 }
1746
1747 static void diff_fill_sha1_info(struct diff_filespec *one)
1748 {
1749 if (DIFF_FILE_VALID(one)) {
1750 if (!one->sha1_valid) {
1751 struct stat st;
1752 if (!strcmp(one->path, "-")) {
1753 hashcpy(one->sha1, null_sha1);
1754 return;
1755 }
1756 if (lstat(one->path, &st) < 0)
1757 die("stat %s", one->path);
1758 if (index_path(one->sha1, one->path, &st, 0))
1759 die("cannot hash %s\n", one->path);
1760 }
1761 }
1762 else
1763 hashclr(one->sha1);
1764 }
1765
1766 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1767 {
1768 const char *pgm = external_diff();
1769 char msg[PATH_MAX*2+300], *xfrm_msg;
1770 struct diff_filespec *one;
1771 struct diff_filespec *two;
1772 const char *name;
1773 const char *other;
1774 char *name_munged, *other_munged;
1775 int complete_rewrite = 0;
1776 int len;
1777
1778 if (DIFF_PAIR_UNMERGED(p)) {
1779 /* unmerged */
1780 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1781 return;
1782 }
1783
1784 name = p->one->path;
1785 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1786 name_munged = quote_one(name);
1787 other_munged = quote_one(other);
1788 one = p->one; two = p->two;
1789
1790 diff_fill_sha1_info(one);
1791 diff_fill_sha1_info(two);
1792
1793 len = 0;
1794 switch (p->status) {
1795 case DIFF_STATUS_COPIED:
1796 len += snprintf(msg + len, sizeof(msg) - len,
1797 "similarity index %d%%\n"
1798 "copy from %s\n"
1799 "copy to %s\n",
1800 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1801 name_munged, other_munged);
1802 break;
1803 case DIFF_STATUS_RENAMED:
1804 len += snprintf(msg + len, sizeof(msg) - len,
1805 "similarity index %d%%\n"
1806 "rename from %s\n"
1807 "rename to %s\n",
1808 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1809 name_munged, other_munged);
1810 break;
1811 case DIFF_STATUS_MODIFIED:
1812 if (p->score) {
1813 len += snprintf(msg + len, sizeof(msg) - len,
1814 "dissimilarity index %d%%\n",
1815 (int)(0.5 + p->score *
1816 100.0/MAX_SCORE));
1817 complete_rewrite = 1;
1818 break;
1819 }
1820 /* fallthru */
1821 default:
1822 /* nothing */
1823 ;
1824 }
1825
1826 if (hashcmp(one->sha1, two->sha1)) {
1827 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1828
1829 if (o->binary) {
1830 mmfile_t mf;
1831 if ((!fill_mmfile(&mf, one) && file_is_binary(one)) ||
1832 (!fill_mmfile(&mf, two) && file_is_binary(two)))
1833 abbrev = 40;
1834 }
1835 len += snprintf(msg + len, sizeof(msg) - len,
1836 "index %.*s..%.*s",
1837 abbrev, sha1_to_hex(one->sha1),
1838 abbrev, sha1_to_hex(two->sha1));
1839 if (one->mode == two->mode)
1840 len += snprintf(msg + len, sizeof(msg) - len,
1841 " %06o", one->mode);
1842 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1843 }
1844
1845 if (len)
1846 msg[--len] = 0;
1847 xfrm_msg = len ? msg : NULL;
1848
1849 if (!pgm &&
1850 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1851 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1852 /* a filepair that changes between file and symlink
1853 * needs to be split into deletion and creation.
1854 */
1855 struct diff_filespec *null = alloc_filespec(two->path);
1856 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1857 free(null);
1858 null = alloc_filespec(one->path);
1859 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1860 free(null);
1861 }
1862 else
1863 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1864 complete_rewrite);
1865
1866 free(name_munged);
1867 free(other_munged);
1868 }
1869
1870 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1871 struct diffstat_t *diffstat)
1872 {
1873 const char *name;
1874 const char *other;
1875 int complete_rewrite = 0;
1876
1877 if (DIFF_PAIR_UNMERGED(p)) {
1878 /* unmerged */
1879 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1880 return;
1881 }
1882
1883 name = p->one->path;
1884 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1885
1886 diff_fill_sha1_info(p->one);
1887 diff_fill_sha1_info(p->two);
1888
1889 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1890 complete_rewrite = 1;
1891 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
1892 }
1893
1894 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1895 {
1896 const char *name;
1897 const char *other;
1898
1899 if (DIFF_PAIR_UNMERGED(p)) {
1900 /* unmerged */
1901 return;
1902 }
1903
1904 name = p->one->path;
1905 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1906
1907 diff_fill_sha1_info(p->one);
1908 diff_fill_sha1_info(p->two);
1909
1910 builtin_checkdiff(name, other, p->one, p->two, o);
1911 }
1912
1913 void diff_setup(struct diff_options *options)
1914 {
1915 memset(options, 0, sizeof(*options));
1916 options->line_termination = '\n';
1917 options->break_opt = -1;
1918 options->rename_limit = -1;
1919 options->context = 3;
1920 options->msg_sep = "";
1921
1922 options->change = diff_change;
1923 options->add_remove = diff_addremove;
1924 options->color_diff = diff_use_color_default;
1925 options->detect_rename = diff_detect_rename_default;
1926 }
1927
1928 int diff_setup_done(struct diff_options *options)
1929 {
1930 int count = 0;
1931
1932 if (options->output_format & DIFF_FORMAT_NAME)
1933 count++;
1934 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
1935 count++;
1936 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
1937 count++;
1938 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
1939 count++;
1940 if (count > 1)
1941 die("--name-only, --name-status, --check and -s are mutually exclusive");
1942
1943 if (options->find_copies_harder)
1944 options->detect_rename = DIFF_DETECT_COPY;
1945
1946 if (options->output_format & (DIFF_FORMAT_NAME |
1947 DIFF_FORMAT_NAME_STATUS |
1948 DIFF_FORMAT_CHECKDIFF |
1949 DIFF_FORMAT_NO_OUTPUT))
1950 options->output_format &= ~(DIFF_FORMAT_RAW |
1951 DIFF_FORMAT_NUMSTAT |
1952 DIFF_FORMAT_DIFFSTAT |
1953 DIFF_FORMAT_SHORTSTAT |
1954 DIFF_FORMAT_SUMMARY |
1955 DIFF_FORMAT_PATCH);
1956
1957 /*
1958 * These cases always need recursive; we do not drop caller-supplied
1959 * recursive bits for other formats here.
1960 */
1961 if (options->output_format & (DIFF_FORMAT_PATCH |
1962 DIFF_FORMAT_NUMSTAT |
1963 DIFF_FORMAT_DIFFSTAT |
1964 DIFF_FORMAT_SHORTSTAT |
1965 DIFF_FORMAT_SUMMARY |
1966 DIFF_FORMAT_CHECKDIFF))
1967 options->recursive = 1;
1968 /*
1969 * Also pickaxe would not work very well if you do not say recursive
1970 */
1971 if (options->pickaxe)
1972 options->recursive = 1;
1973
1974 if (options->detect_rename && options->rename_limit < 0)
1975 options->rename_limit = diff_rename_limit_default;
1976 if (options->setup & DIFF_SETUP_USE_CACHE) {
1977 if (!active_cache)
1978 /* read-cache does not die even when it fails
1979 * so it is safe for us to do this here. Also
1980 * it does not smudge active_cache or active_nr
1981 * when it fails, so we do not have to worry about
1982 * cleaning it up ourselves either.
1983 */
1984 read_cache();
1985 }
1986 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
1987 use_size_cache = 1;
1988 if (options->abbrev <= 0 || 40 < options->abbrev)
1989 options->abbrev = 40; /* full */
1990
1991 /*
1992 * It does not make sense to show the first hit we happened
1993 * to have found. It does not make sense not to return with
1994 * exit code in such a case either.
1995 */
1996 if (options->quiet) {
1997 options->output_format = DIFF_FORMAT_NO_OUTPUT;
1998 options->exit_with_status = 1;
1999 }
2000
2001 /*
2002 * If we postprocess in diffcore, we cannot simply return
2003 * upon the first hit. We need to run diff as usual.
2004 */
2005 if (options->pickaxe || options->filter)
2006 options->quiet = 0;
2007
2008 return 0;
2009 }
2010
2011 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2012 {
2013 char c, *eq;
2014 int len;
2015
2016 if (*arg != '-')
2017 return 0;
2018 c = *++arg;
2019 if (!c)
2020 return 0;
2021 if (c == arg_short) {
2022 c = *++arg;
2023 if (!c)
2024 return 1;
2025 if (val && isdigit(c)) {
2026 char *end;
2027 int n = strtoul(arg, &end, 10);
2028 if (*end)
2029 return 0;
2030 *val = n;
2031 return 1;
2032 }
2033 return 0;
2034 }
2035 if (c != '-')
2036 return 0;
2037 arg++;
2038 eq = strchr(arg, '=');
2039 if (eq)
2040 len = eq - arg;
2041 else
2042 len = strlen(arg);
2043 if (!len || strncmp(arg, arg_long, len))
2044 return 0;
2045 if (eq) {
2046 int n;
2047 char *end;
2048 if (!isdigit(*++eq))
2049 return 0;
2050 n = strtoul(eq, &end, 10);
2051 if (*end)
2052 return 0;
2053 *val = n;
2054 }
2055 return 1;
2056 }
2057
2058 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2059 {
2060 const char *arg = av[0];
2061 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2062 options->output_format |= DIFF_FORMAT_PATCH;
2063 else if (opt_arg(arg, 'U', "unified", &options->context))
2064 options->output_format |= DIFF_FORMAT_PATCH;
2065 else if (!strcmp(arg, "--raw"))
2066 options->output_format |= DIFF_FORMAT_RAW;
2067 else if (!strcmp(arg, "--patch-with-raw")) {
2068 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2069 }
2070 else if (!strcmp(arg, "--numstat")) {
2071 options->output_format |= DIFF_FORMAT_NUMSTAT;
2072 }
2073 else if (!strcmp(arg, "--shortstat")) {
2074 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2075 }
2076 else if (!prefixcmp(arg, "--stat")) {
2077 char *end;
2078 int width = options->stat_width;
2079 int name_width = options->stat_name_width;
2080 arg += 6;
2081 end = (char *)arg;
2082
2083 switch (*arg) {
2084 case '-':
2085 if (!prefixcmp(arg, "-width="))
2086 width = strtoul(arg + 7, &end, 10);
2087 else if (!prefixcmp(arg, "-name-width="))
2088 name_width = strtoul(arg + 12, &end, 10);
2089 break;
2090 case '=':
2091 width = strtoul(arg+1, &end, 10);
2092 if (*end == ',')
2093 name_width = strtoul(end+1, &end, 10);
2094 }
2095
2096 /* Important! This checks all the error cases! */
2097 if (*end)
2098 return 0;
2099 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2100 options->stat_name_width = name_width;
2101 options->stat_width = width;
2102 }
2103 else if (!strcmp(arg, "--check"))
2104 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2105 else if (!strcmp(arg, "--summary"))
2106 options->output_format |= DIFF_FORMAT_SUMMARY;
2107 else if (!strcmp(arg, "--patch-with-stat")) {
2108 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2109 }
2110 else if (!strcmp(arg, "-z"))
2111 options->line_termination = 0;
2112 else if (!prefixcmp(arg, "-l"))
2113 options->rename_limit = strtoul(arg+2, NULL, 10);
2114 else if (!strcmp(arg, "--full-index"))
2115 options->full_index = 1;
2116 else if (!strcmp(arg, "--binary")) {
2117 options->output_format |= DIFF_FORMAT_PATCH;
2118 options->binary = 1;
2119 }
2120 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
2121 options->text = 1;
2122 }
2123 else if (!strcmp(arg, "--name-only"))
2124 options->output_format |= DIFF_FORMAT_NAME;
2125 else if (!strcmp(arg, "--name-status"))
2126 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2127 else if (!strcmp(arg, "-R"))
2128 options->reverse_diff = 1;
2129 else if (!prefixcmp(arg, "-S"))
2130 options->pickaxe = arg + 2;
2131 else if (!strcmp(arg, "-s")) {
2132 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2133 }
2134 else if (!prefixcmp(arg, "-O"))
2135 options->orderfile = arg + 2;
2136 else if (!prefixcmp(arg, "--diff-filter="))
2137 options->filter = arg + 14;
2138 else if (!strcmp(arg, "--pickaxe-all"))
2139 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2140 else if (!strcmp(arg, "--pickaxe-regex"))
2141 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2142 else if (!prefixcmp(arg, "-B")) {
2143 if ((options->break_opt =
2144 diff_scoreopt_parse(arg)) == -1)
2145 return -1;
2146 }
2147 else if (!prefixcmp(arg, "-M")) {
2148 if ((options->rename_score =
2149 diff_scoreopt_parse(arg)) == -1)
2150 return -1;
2151 options->detect_rename = DIFF_DETECT_RENAME;
2152 }
2153 else if (!prefixcmp(arg, "-C")) {
2154 if ((options->rename_score =
2155 diff_scoreopt_parse(arg)) == -1)
2156 return -1;
2157 options->detect_rename = DIFF_DETECT_COPY;
2158 }
2159 else if (!strcmp(arg, "--find-copies-harder"))
2160 options->find_copies_harder = 1;
2161 else if (!strcmp(arg, "--abbrev"))
2162 options->abbrev = DEFAULT_ABBREV;
2163 else if (!prefixcmp(arg, "--abbrev=")) {
2164 options->abbrev = strtoul(arg + 9, NULL, 10);
2165 if (options->abbrev < MINIMUM_ABBREV)
2166 options->abbrev = MINIMUM_ABBREV;
2167 else if (40 < options->abbrev)
2168 options->abbrev = 40;
2169 }
2170 else if (!strcmp(arg, "--color"))
2171 options->color_diff = 1;
2172 else if (!strcmp(arg, "--no-color"))
2173 options->color_diff = 0;
2174 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2175 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2176 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2177 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2178 else if (!strcmp(arg, "--ignore-space-at-eol"))
2179 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2180 else if (!strcmp(arg, "--color-words"))
2181 options->color_diff = options->color_diff_words = 1;
2182 else if (!strcmp(arg, "--no-renames"))
2183 options->detect_rename = 0;
2184 else if (!strcmp(arg, "--exit-code"))
2185 options->exit_with_status = 1;
2186 else if (!strcmp(arg, "--quiet"))
2187 options->quiet = 1;
2188 else
2189 return 0;
2190 return 1;
2191 }
2192
2193 static int parse_num(const char **cp_p)
2194 {
2195 unsigned long num, scale;
2196 int ch, dot;
2197 const char *cp = *cp_p;
2198
2199 num = 0;
2200 scale = 1;
2201 dot = 0;
2202 for(;;) {
2203 ch = *cp;
2204 if ( !dot && ch == '.' ) {
2205 scale = 1;
2206 dot = 1;
2207 } else if ( ch == '%' ) {
2208 scale = dot ? scale*100 : 100;
2209 cp++; /* % is always at the end */
2210 break;
2211 } else if ( ch >= '0' && ch <= '9' ) {
2212 if ( scale < 100000 ) {
2213 scale *= 10;
2214 num = (num*10) + (ch-'0');
2215 }
2216 } else {
2217 break;
2218 }
2219 cp++;
2220 }
2221 *cp_p = cp;
2222
2223 /* user says num divided by scale and we say internally that
2224 * is MAX_SCORE * num / scale.
2225 */
2226 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2227 }
2228
2229 int diff_scoreopt_parse(const char *opt)
2230 {
2231 int opt1, opt2, cmd;
2232
2233 if (*opt++ != '-')
2234 return -1;
2235 cmd = *opt++;
2236 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2237 return -1; /* that is not a -M, -C nor -B option */
2238
2239 opt1 = parse_num(&opt);
2240 if (cmd != 'B')
2241 opt2 = 0;
2242 else {
2243 if (*opt == 0)
2244 opt2 = 0;
2245 else if (*opt != '/')
2246 return -1; /* we expect -B80/99 or -B80 */
2247 else {
2248 opt++;
2249 opt2 = parse_num(&opt);
2250 }
2251 }
2252 if (*opt != 0)
2253 return -1;
2254 return opt1 | (opt2 << 16);
2255 }
2256
2257 struct diff_queue_struct diff_queued_diff;
2258
2259 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2260 {
2261 if (queue->alloc <= queue->nr) {
2262 queue->alloc = alloc_nr(queue->alloc);
2263 queue->queue = xrealloc(queue->queue,
2264 sizeof(dp) * queue->alloc);
2265 }
2266 queue->queue[queue->nr++] = dp;
2267 }
2268
2269 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2270 struct diff_filespec *one,
2271 struct diff_filespec *two)
2272 {
2273 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2274 dp->one = one;
2275 dp->two = two;
2276 if (queue)
2277 diff_q(queue, dp);
2278 return dp;
2279 }
2280
2281 void diff_free_filepair(struct diff_filepair *p)
2282 {
2283 diff_free_filespec_data(p->one);
2284 diff_free_filespec_data(p->two);
2285 free(p->one);
2286 free(p->two);
2287 free(p);
2288 }
2289
2290 /* This is different from find_unique_abbrev() in that
2291 * it stuffs the result with dots for alignment.
2292 */
2293 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2294 {
2295 int abblen;
2296 const char *abbrev;
2297 if (len == 40)
2298 return sha1_to_hex(sha1);
2299
2300 abbrev = find_unique_abbrev(sha1, len);
2301 if (!abbrev)
2302 return sha1_to_hex(sha1);
2303 abblen = strlen(abbrev);
2304 if (abblen < 37) {
2305 static char hex[41];
2306 if (len < abblen && abblen <= len + 2)
2307 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2308 else
2309 sprintf(hex, "%s...", abbrev);
2310 return hex;
2311 }
2312 return sha1_to_hex(sha1);
2313 }
2314
2315 static void diff_flush_raw(struct diff_filepair *p,
2316 struct diff_options *options)
2317 {
2318 int two_paths;
2319 char status[10];
2320 int abbrev = options->abbrev;
2321 const char *path_one, *path_two;
2322 int inter_name_termination = '\t';
2323 int line_termination = options->line_termination;
2324
2325 if (!line_termination)
2326 inter_name_termination = 0;
2327
2328 path_one = p->one->path;
2329 path_two = p->two->path;
2330 if (line_termination) {
2331 path_one = quote_one(path_one);
2332 path_two = quote_one(path_two);
2333 }
2334
2335 if (p->score)
2336 sprintf(status, "%c%03d", p->status,
2337 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2338 else {
2339 status[0] = p->status;
2340 status[1] = 0;
2341 }
2342 switch (p->status) {
2343 case DIFF_STATUS_COPIED:
2344 case DIFF_STATUS_RENAMED:
2345 two_paths = 1;
2346 break;
2347 case DIFF_STATUS_ADDED:
2348 case DIFF_STATUS_DELETED:
2349 two_paths = 0;
2350 break;
2351 default:
2352 two_paths = 0;
2353 break;
2354 }
2355 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
2356 printf(":%06o %06o %s ",
2357 p->one->mode, p->two->mode,
2358 diff_unique_abbrev(p->one->sha1, abbrev));
2359 printf("%s ",
2360 diff_unique_abbrev(p->two->sha1, abbrev));
2361 }
2362 printf("%s%c%s", status, inter_name_termination, path_one);
2363 if (two_paths)
2364 printf("%c%s", inter_name_termination, path_two);
2365 putchar(line_termination);
2366 if (path_one != p->one->path)
2367 free((void*)path_one);
2368 if (path_two != p->two->path)
2369 free((void*)path_two);
2370 }
2371
2372 static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
2373 {
2374 char *path = p->two->path;
2375
2376 if (opt->line_termination)
2377 path = quote_one(p->two->path);
2378 printf("%s%c", path, opt->line_termination);
2379 if (p->two->path != path)
2380 free(path);
2381 }
2382
2383 int diff_unmodified_pair(struct diff_filepair *p)
2384 {
2385 /* This function is written stricter than necessary to support
2386 * the currently implemented transformers, but the idea is to
2387 * let transformers to produce diff_filepairs any way they want,
2388 * and filter and clean them up here before producing the output.
2389 */
2390 struct diff_filespec *one, *two;
2391
2392 if (DIFF_PAIR_UNMERGED(p))
2393 return 0; /* unmerged is interesting */
2394
2395 one = p->one;
2396 two = p->two;
2397
2398 /* deletion, addition, mode or type change
2399 * and rename are all interesting.
2400 */
2401 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2402 DIFF_PAIR_MODE_CHANGED(p) ||
2403 strcmp(one->path, two->path))
2404 return 0;
2405
2406 /* both are valid and point at the same path. that is, we are
2407 * dealing with a change.
2408 */
2409 if (one->sha1_valid && two->sha1_valid &&
2410 !hashcmp(one->sha1, two->sha1))
2411 return 1; /* no change */
2412 if (!one->sha1_valid && !two->sha1_valid)
2413 return 1; /* both look at the same file on the filesystem. */
2414 return 0;
2415 }
2416
2417 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2418 {
2419 if (diff_unmodified_pair(p))
2420 return;
2421
2422 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2423 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2424 return; /* no tree diffs in patch format */
2425
2426 run_diff(p, o);
2427 }
2428
2429 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2430 struct diffstat_t *diffstat)
2431 {
2432 if (diff_unmodified_pair(p))
2433 return;
2434
2435 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2436 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2437 return; /* no tree diffs in patch format */
2438
2439 run_diffstat(p, o, diffstat);
2440 }
2441
2442 static void diff_flush_checkdiff(struct diff_filepair *p,
2443 struct diff_options *o)
2444 {
2445 if (diff_unmodified_pair(p))
2446 return;
2447
2448 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2449 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2450 return; /* no tree diffs in patch format */
2451
2452 run_checkdiff(p, o);
2453 }
2454
2455 int diff_queue_is_empty(void)
2456 {
2457 struct diff_queue_struct *q = &diff_queued_diff;
2458 int i;
2459 for (i = 0; i < q->nr; i++)
2460 if (!diff_unmodified_pair(q->queue[i]))
2461 return 0;
2462 return 1;
2463 }
2464
2465 #if DIFF_DEBUG
2466 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2467 {
2468 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2469 x, one ? one : "",
2470 s->path,
2471 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2472 s->mode,
2473 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2474 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2475 x, one ? one : "",
2476 s->size, s->xfrm_flags);
2477 }
2478
2479 void diff_debug_filepair(const struct diff_filepair *p, int i)
2480 {
2481 diff_debug_filespec(p->one, i, "one");
2482 diff_debug_filespec(p->two, i, "two");
2483 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2484 p->score, p->status ? p->status : '?',
2485 p->source_stays, p->broken_pair);
2486 }
2487
2488 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2489 {
2490 int i;
2491 if (msg)
2492 fprintf(stderr, "%s\n", msg);
2493 fprintf(stderr, "q->nr = %d\n", q->nr);
2494 for (i = 0; i < q->nr; i++) {
2495 struct diff_filepair *p = q->queue[i];
2496 diff_debug_filepair(p, i);
2497 }
2498 }
2499 #endif
2500
2501 static void diff_resolve_rename_copy(void)
2502 {
2503 int i, j;
2504 struct diff_filepair *p, *pp;
2505 struct diff_queue_struct *q = &diff_queued_diff;
2506
2507 diff_debug_queue("resolve-rename-copy", q);
2508
2509 for (i = 0; i < q->nr; i++) {
2510 p = q->queue[i];
2511 p->status = 0; /* undecided */
2512 if (DIFF_PAIR_UNMERGED(p))
2513 p->status = DIFF_STATUS_UNMERGED;
2514 else if (!DIFF_FILE_VALID(p->one))
2515 p->status = DIFF_STATUS_ADDED;
2516 else if (!DIFF_FILE_VALID(p->two))
2517 p->status = DIFF_STATUS_DELETED;
2518 else if (DIFF_PAIR_TYPE_CHANGED(p))
2519 p->status = DIFF_STATUS_TYPE_CHANGED;
2520
2521 /* from this point on, we are dealing with a pair
2522 * whose both sides are valid and of the same type, i.e.
2523 * either in-place edit or rename/copy edit.
2524 */
2525 else if (DIFF_PAIR_RENAME(p)) {
2526 if (p->source_stays) {
2527 p->status = DIFF_STATUS_COPIED;
2528 continue;
2529 }
2530 /* See if there is some other filepair that
2531 * copies from the same source as us. If so
2532 * we are a copy. Otherwise we are either a
2533 * copy if the path stays, or a rename if it
2534 * does not, but we already handled "stays" case.
2535 */
2536 for (j = i + 1; j < q->nr; j++) {
2537 pp = q->queue[j];
2538 if (strcmp(pp->one->path, p->one->path))
2539 continue; /* not us */
2540 if (!DIFF_PAIR_RENAME(pp))
2541 continue; /* not a rename/copy */
2542 /* pp is a rename/copy from the same source */
2543 p->status = DIFF_STATUS_COPIED;
2544 break;
2545 }
2546 if (!p->status)
2547 p->status = DIFF_STATUS_RENAMED;
2548 }
2549 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2550 p->one->mode != p->two->mode ||
2551 is_null_sha1(p->one->sha1))
2552 p->status = DIFF_STATUS_MODIFIED;
2553 else {
2554 /* This is a "no-change" entry and should not
2555 * happen anymore, but prepare for broken callers.
2556 */
2557 error("feeding unmodified %s to diffcore",
2558 p->one->path);
2559 p->status = DIFF_STATUS_UNKNOWN;
2560 }
2561 }
2562 diff_debug_queue("resolve-rename-copy done", q);
2563 }
2564
2565 static int check_pair_status(struct diff_filepair *p)
2566 {
2567 switch (p->status) {
2568 case DIFF_STATUS_UNKNOWN:
2569 return 0;
2570 case 0:
2571 die("internal error in diff-resolve-rename-copy");
2572 default:
2573 return 1;
2574 }
2575 }
2576
2577 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2578 {
2579 int fmt = opt->output_format;
2580
2581 if (fmt & DIFF_FORMAT_CHECKDIFF)
2582 diff_flush_checkdiff(p, opt);
2583 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2584 diff_flush_raw(p, opt);
2585 else if (fmt & DIFF_FORMAT_NAME)
2586 diff_flush_name(p, opt);
2587 }
2588
2589 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2590 {
2591 char *name = quote_one(fs->path);
2592 if (fs->mode)
2593 printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
2594 else
2595 printf(" %s %s\n", newdelete, name);
2596 free(name);
2597 }
2598
2599
2600 static void show_mode_change(struct diff_filepair *p, int show_name)
2601 {
2602 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2603 if (show_name) {
2604 char *name = quote_one(p->two->path);
2605 printf(" mode change %06o => %06o %s\n",
2606 p->one->mode, p->two->mode, name);
2607 free(name);
2608 }
2609 else
2610 printf(" mode change %06o => %06o\n",
2611 p->one->mode, p->two->mode);
2612 }
2613 }
2614
2615 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2616 {
2617 char *names = pprint_rename(p->one->path, p->two->path);
2618
2619 printf(" %s %s (%d%%)\n", renamecopy, names,
2620 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2621 free(names);
2622 show_mode_change(p, 0);
2623 }
2624
2625 static void diff_summary(struct diff_filepair *p)
2626 {
2627 switch(p->status) {
2628 case DIFF_STATUS_DELETED:
2629 show_file_mode_name("delete", p->one);
2630 break;
2631 case DIFF_STATUS_ADDED:
2632 show_file_mode_name("create", p->two);
2633 break;
2634 case DIFF_STATUS_COPIED:
2635 show_rename_copy("copy", p);
2636 break;
2637 case DIFF_STATUS_RENAMED:
2638 show_rename_copy("rename", p);
2639 break;
2640 default:
2641 if (p->score) {
2642 char *name = quote_one(p->two->path);
2643 printf(" rewrite %s (%d%%)\n", name,
2644 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2645 free(name);
2646 show_mode_change(p, 0);
2647 } else show_mode_change(p, 1);
2648 break;
2649 }
2650 }
2651
2652 struct patch_id_t {
2653 struct xdiff_emit_state xm;
2654 SHA_CTX *ctx;
2655 int patchlen;
2656 };
2657
2658 static int remove_space(char *line, int len)
2659 {
2660 int i;
2661 char *dst = line;
2662 unsigned char c;
2663
2664 for (i = 0; i < len; i++)
2665 if (!isspace((c = line[i])))
2666 *dst++ = c;
2667
2668 return dst - line;
2669 }
2670
2671 static void patch_id_consume(void *priv, char *line, unsigned long len)
2672 {
2673 struct patch_id_t *data = priv;
2674 int new_len;
2675
2676 /* Ignore line numbers when computing the SHA1 of the patch */
2677 if (!prefixcmp(line, "@@ -"))
2678 return;
2679
2680 new_len = remove_space(line, len);
2681
2682 SHA1_Update(data->ctx, line, new_len);
2683 data->patchlen += new_len;
2684 }
2685
2686 /* returns 0 upon success, and writes result into sha1 */
2687 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2688 {
2689 struct diff_queue_struct *q = &diff_queued_diff;
2690 int i;
2691 SHA_CTX ctx;
2692 struct patch_id_t data;
2693 char buffer[PATH_MAX * 4 + 20];
2694
2695 SHA1_Init(&ctx);
2696 memset(&data, 0, sizeof(struct patch_id_t));
2697 data.ctx = &ctx;
2698 data.xm.consume = patch_id_consume;
2699
2700 for (i = 0; i < q->nr; i++) {
2701 xpparam_t xpp;
2702 xdemitconf_t xecfg;
2703 xdemitcb_t ecb;
2704 mmfile_t mf1, mf2;
2705 struct diff_filepair *p = q->queue[i];
2706 int len1, len2;
2707
2708 if (p->status == 0)
2709 return error("internal diff status error");
2710 if (p->status == DIFF_STATUS_UNKNOWN)
2711 continue;
2712 if (diff_unmodified_pair(p))
2713 continue;
2714 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2715 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2716 continue;
2717 if (DIFF_PAIR_UNMERGED(p))
2718 continue;
2719
2720 diff_fill_sha1_info(p->one);
2721 diff_fill_sha1_info(p->two);
2722 if (fill_mmfile(&mf1, p->one) < 0 ||
2723 fill_mmfile(&mf2, p->two) < 0)
2724 return error("unable to read files to diff");
2725
2726 /* Maybe hash p->two? into the patch id? */
2727 if (file_is_binary(p->two))
2728 continue;
2729
2730 len1 = remove_space(p->one->path, strlen(p->one->path));
2731 len2 = remove_space(p->two->path, strlen(p->two->path));
2732 if (p->one->mode == 0)
2733 len1 = snprintf(buffer, sizeof(buffer),
2734 "diff--gita/%.*sb/%.*s"
2735 "newfilemode%06o"
2736 "---/dev/null"
2737 "+++b/%.*s",
2738 len1, p->one->path,
2739 len2, p->two->path,
2740 p->two->mode,
2741 len2, p->two->path);
2742 else if (p->two->mode == 0)
2743 len1 = snprintf(buffer, sizeof(buffer),
2744 "diff--gita/%.*sb/%.*s"
2745 "deletedfilemode%06o"
2746 "---a/%.*s"
2747 "+++/dev/null",
2748 len1, p->one->path,
2749 len2, p->two->path,
2750 p->one->mode,
2751 len1, p->one->path);
2752 else
2753 len1 = snprintf(buffer, sizeof(buffer),
2754 "diff--gita/%.*sb/%.*s"
2755 "---a/%.*s"
2756 "+++b/%.*s",
2757 len1, p->one->path,
2758 len2, p->two->path,
2759 len1, p->one->path,
2760 len2, p->two->path);
2761 SHA1_Update(&ctx, buffer, len1);
2762
2763 xpp.flags = XDF_NEED_MINIMAL;
2764 xecfg.ctxlen = 3;
2765 xecfg.flags = XDL_EMIT_FUNCNAMES;
2766 ecb.outf = xdiff_outf;
2767 ecb.priv = &data;
2768 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2769 }
2770
2771 SHA1_Final(sha1, &ctx);
2772 return 0;
2773 }
2774
2775 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2776 {
2777 struct diff_queue_struct *q = &diff_queued_diff;
2778 int i;
2779 int result = diff_get_patch_id(options, sha1);
2780
2781 for (i = 0; i < q->nr; i++)
2782 diff_free_filepair(q->queue[i]);
2783
2784 free(q->queue);
2785 q->queue = NULL;
2786 q->nr = q->alloc = 0;
2787
2788 return result;
2789 }
2790
2791 static int is_summary_empty(const struct diff_queue_struct *q)
2792 {
2793 int i;
2794
2795 for (i = 0; i < q->nr; i++) {
2796 const struct diff_filepair *p = q->queue[i];
2797
2798 switch (p->status) {
2799 case DIFF_STATUS_DELETED:
2800 case DIFF_STATUS_ADDED:
2801 case DIFF_STATUS_COPIED:
2802 case DIFF_STATUS_RENAMED:
2803 return 0;
2804 default:
2805 if (p->score)
2806 return 0;
2807 if (p->one->mode && p->two->mode &&
2808 p->one->mode != p->two->mode)
2809 return 0;
2810 break;
2811 }
2812 }
2813 return 1;
2814 }
2815
2816 void diff_flush(struct diff_options *options)
2817 {
2818 struct diff_queue_struct *q = &diff_queued_diff;
2819 int i, output_format = options->output_format;
2820 int separator = 0;
2821
2822 /*
2823 * Order: raw, stat, summary, patch
2824 * or: name/name-status/checkdiff (other bits clear)
2825 */
2826 if (!q->nr)
2827 goto free_queue;
2828
2829 if (output_format & (DIFF_FORMAT_RAW |
2830 DIFF_FORMAT_NAME |
2831 DIFF_FORMAT_NAME_STATUS |
2832 DIFF_FORMAT_CHECKDIFF)) {
2833 for (i = 0; i < q->nr; i++) {
2834 struct diff_filepair *p = q->queue[i];
2835 if (check_pair_status(p))
2836 flush_one_pair(p, options);
2837 }
2838 separator++;
2839 }
2840
2841 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2842 struct diffstat_t diffstat;
2843
2844 memset(&diffstat, 0, sizeof(struct diffstat_t));
2845 diffstat.xm.consume = diffstat_consume;
2846 for (i = 0; i < q->nr; i++) {
2847 struct diff_filepair *p = q->queue[i];
2848 if (check_pair_status(p))
2849 diff_flush_stat(p, options, &diffstat);
2850 }
2851 if (output_format & DIFF_FORMAT_NUMSTAT)
2852 show_numstat(&diffstat, options);
2853 if (output_format & DIFF_FORMAT_DIFFSTAT)
2854 show_stats(&diffstat, options);
2855 else if (output_format & DIFF_FORMAT_SHORTSTAT)
2856 show_shortstats(&diffstat);
2857 separator++;
2858 }
2859
2860 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2861 for (i = 0; i < q->nr; i++)
2862 diff_summary(q->queue[i]);
2863 separator++;
2864 }
2865
2866 if (output_format & DIFF_FORMAT_PATCH) {
2867 if (separator) {
2868 if (options->stat_sep) {
2869 /* attach patch instead of inline */
2870 fputs(options->stat_sep, stdout);
2871 } else {
2872 putchar(options->line_termination);
2873 }
2874 }
2875
2876 for (i = 0; i < q->nr; i++) {
2877 struct diff_filepair *p = q->queue[i];
2878 if (check_pair_status(p))
2879 diff_flush_patch(p, options);
2880 }
2881 }
2882
2883 if (output_format & DIFF_FORMAT_CALLBACK)
2884 options->format_callback(q, options, options->format_callback_data);
2885
2886 for (i = 0; i < q->nr; i++)
2887 diff_free_filepair(q->queue[i]);
2888 free_queue:
2889 free(q->queue);
2890 q->queue = NULL;
2891 q->nr = q->alloc = 0;
2892 }
2893
2894 static void diffcore_apply_filter(const char *filter)
2895 {
2896 int i;
2897 struct diff_queue_struct *q = &diff_queued_diff;
2898 struct diff_queue_struct outq;
2899 outq.queue = NULL;
2900 outq.nr = outq.alloc = 0;
2901
2902 if (!filter)
2903 return;
2904
2905 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2906 int found;
2907 for (i = found = 0; !found && i < q->nr; i++) {
2908 struct diff_filepair *p = q->queue[i];
2909 if (((p->status == DIFF_STATUS_MODIFIED) &&
2910 ((p->score &&
2911 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2912 (!p->score &&
2913 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2914 ((p->status != DIFF_STATUS_MODIFIED) &&
2915 strchr(filter, p->status)))
2916 found++;
2917 }
2918 if (found)
2919 return;
2920
2921 /* otherwise we will clear the whole queue
2922 * by copying the empty outq at the end of this
2923 * function, but first clear the current entries
2924 * in the queue.
2925 */
2926 for (i = 0; i < q->nr; i++)
2927 diff_free_filepair(q->queue[i]);
2928 }
2929 else {
2930 /* Only the matching ones */
2931 for (i = 0; i < q->nr; i++) {
2932 struct diff_filepair *p = q->queue[i];
2933
2934 if (((p->status == DIFF_STATUS_MODIFIED) &&
2935 ((p->score &&
2936 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2937 (!p->score &&
2938 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2939 ((p->status != DIFF_STATUS_MODIFIED) &&
2940 strchr(filter, p->status)))
2941 diff_q(&outq, p);
2942 else
2943 diff_free_filepair(p);
2944 }
2945 }
2946 free(q->queue);
2947 *q = outq;
2948 }
2949
2950 void diffcore_std(struct diff_options *options)
2951 {
2952 if (options->quiet)
2953 return;
2954 if (options->break_opt != -1)
2955 diffcore_break(options->break_opt);
2956 if (options->detect_rename)
2957 diffcore_rename(options);
2958 if (options->break_opt != -1)
2959 diffcore_merge_broken();
2960 if (options->pickaxe)
2961 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2962 if (options->orderfile)
2963 diffcore_order(options->orderfile);
2964 diff_resolve_rename_copy();
2965 diffcore_apply_filter(options->filter);
2966
2967 options->has_changes = !!diff_queued_diff.nr;
2968 }
2969
2970
2971 void diff_addremove(struct diff_options *options,
2972 int addremove, unsigned mode,
2973 const unsigned char *sha1,
2974 const char *base, const char *path)
2975 {
2976 char concatpath[PATH_MAX];
2977 struct diff_filespec *one, *two;
2978
2979 /* This may look odd, but it is a preparation for
2980 * feeding "there are unchanged files which should
2981 * not produce diffs, but when you are doing copy
2982 * detection you would need them, so here they are"
2983 * entries to the diff-core. They will be prefixed
2984 * with something like '=' or '*' (I haven't decided
2985 * which but should not make any difference).
2986 * Feeding the same new and old to diff_change()
2987 * also has the same effect.
2988 * Before the final output happens, they are pruned after
2989 * merged into rename/copy pairs as appropriate.
2990 */
2991 if (options->reverse_diff)
2992 addremove = (addremove == '+' ? '-' :
2993 addremove == '-' ? '+' : addremove);
2994
2995 if (!path) path = "";
2996 sprintf(concatpath, "%s%s", base, path);
2997 one = alloc_filespec(concatpath);
2998 two = alloc_filespec(concatpath);
2999
3000 if (addremove != '+')
3001 fill_filespec(one, sha1, mode);
3002 if (addremove != '-')
3003 fill_filespec(two, sha1, mode);
3004
3005 diff_queue(&diff_queued_diff, one, two);
3006 options->has_changes = 1;
3007 }
3008
3009 void diff_change(struct diff_options *options,
3010 unsigned old_mode, unsigned new_mode,
3011 const unsigned char *old_sha1,
3012 const unsigned char *new_sha1,
3013 const char *base, const char *path)
3014 {
3015 char concatpath[PATH_MAX];
3016 struct diff_filespec *one, *two;
3017
3018 if (options->reverse_diff) {
3019 unsigned tmp;
3020 const unsigned char *tmp_c;
3021 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3022 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3023 }
3024 if (!path) path = "";
3025 sprintf(concatpath, "%s%s", base, path);
3026 one = alloc_filespec(concatpath);
3027 two = alloc_filespec(concatpath);
3028 fill_filespec(one, old_sha1, old_mode);
3029 fill_filespec(two, new_sha1, new_mode);
3030
3031 diff_queue(&diff_queued_diff, one, two);
3032 options->has_changes = 1;
3033 }
3034
3035 void diff_unmerge(struct diff_options *options,
3036 const char *path,
3037 unsigned mode, const unsigned char *sha1)
3038 {
3039 struct diff_filespec *one, *two;
3040 one = alloc_filespec(path);
3041 two = alloc_filespec(path);
3042 fill_filespec(one, sha1, mode);
3043 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3044 }
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