Merge branch 'jc/attr'
[git/git.git] / diff.c
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 const char *value = attr_diff_check.value;
1073 if (ATTR_TRUE(value))
1074 return 0;
1075 else if (ATTR_FALSE(value))
1076 return 1;
1077 else if (ATTR_UNSET(value))
1078 ;
1079 else
1080 die("unknown value %s given to 'diff' attribute",
1081 value);
1082 }
1083
1084 if (!one->data) {
1085 if (!DIFF_FILE_VALID(one))
1086 return 0;
1087 diff_populate_filespec(one, 0);
1088 }
1089 sz = one->size;
1090 if (FIRST_FEW_BYTES < sz)
1091 sz = FIRST_FEW_BYTES;
1092 return !!memchr(one->data, 0, sz);
1093 }
1094
1095 static void builtin_diff(const char *name_a,
1096 const char *name_b,
1097 struct diff_filespec *one,
1098 struct diff_filespec *two,
1099 const char *xfrm_msg,
1100 struct diff_options *o,
1101 int complete_rewrite)
1102 {
1103 mmfile_t mf1, mf2;
1104 const char *lbl[2];
1105 char *a_one, *b_two;
1106 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1107 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
1108
1109 a_one = quote_two("a/", name_a + (*name_a == '/'));
1110 b_two = quote_two("b/", name_b + (*name_b == '/'));
1111 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1112 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1113 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1114 if (lbl[0][0] == '/') {
1115 /* /dev/null */
1116 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1117 if (xfrm_msg && xfrm_msg[0])
1118 printf("%s%s%s\n", set, xfrm_msg, reset);
1119 }
1120 else if (lbl[1][0] == '/') {
1121 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1122 if (xfrm_msg && xfrm_msg[0])
1123 printf("%s%s%s\n", set, xfrm_msg, reset);
1124 }
1125 else {
1126 if (one->mode != two->mode) {
1127 printf("%sold mode %06o%s\n", set, one->mode, reset);
1128 printf("%snew mode %06o%s\n", set, two->mode, reset);
1129 }
1130 if (xfrm_msg && xfrm_msg[0])
1131 printf("%s%s%s\n", set, xfrm_msg, reset);
1132 /*
1133 * we do not run diff between different kind
1134 * of objects.
1135 */
1136 if ((one->mode ^ two->mode) & S_IFMT)
1137 goto free_ab_and_return;
1138 if (complete_rewrite) {
1139 emit_rewrite_diff(name_a, name_b, one, two,
1140 o->color_diff);
1141 o->found_changes = 1;
1142 goto free_ab_and_return;
1143 }
1144 }
1145
1146 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1147 die("unable to read files to diff");
1148
1149 if (!o->text && (file_is_binary(one) || file_is_binary(two))) {
1150 /* Quite common confusing case */
1151 if (mf1.size == mf2.size &&
1152 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1153 goto free_ab_and_return;
1154 if (o->binary)
1155 emit_binary_diff(&mf1, &mf2);
1156 else
1157 printf("Binary files %s and %s differ\n",
1158 lbl[0], lbl[1]);
1159 o->found_changes = 1;
1160 }
1161 else {
1162 /* Crazy xdl interfaces.. */
1163 const char *diffopts = getenv("GIT_DIFF_OPTS");
1164 xpparam_t xpp;
1165 xdemitconf_t xecfg;
1166 xdemitcb_t ecb;
1167 struct emit_callback ecbdata;
1168
1169 memset(&ecbdata, 0, sizeof(ecbdata));
1170 ecbdata.label_path = lbl;
1171 ecbdata.color_diff = o->color_diff;
1172 ecbdata.found_changesp = &o->found_changes;
1173 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1174 xecfg.ctxlen = o->context;
1175 xecfg.flags = XDL_EMIT_FUNCNAMES;
1176 if (!diffopts)
1177 ;
1178 else if (!prefixcmp(diffopts, "--unified="))
1179 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1180 else if (!prefixcmp(diffopts, "-u"))
1181 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1182 ecb.outf = xdiff_outf;
1183 ecb.priv = &ecbdata;
1184 ecbdata.xm.consume = fn_out_consume;
1185 if (o->color_diff_words)
1186 ecbdata.diff_words =
1187 xcalloc(1, sizeof(struct diff_words_data));
1188 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1189 if (o->color_diff_words)
1190 free_diff_words_data(&ecbdata);
1191 }
1192
1193 free_ab_and_return:
1194 free(a_one);
1195 free(b_two);
1196 return;
1197 }
1198
1199 static void builtin_diffstat(const char *name_a, const char *name_b,
1200 struct diff_filespec *one,
1201 struct diff_filespec *two,
1202 struct diffstat_t *diffstat,
1203 struct diff_options *o,
1204 int complete_rewrite)
1205 {
1206 mmfile_t mf1, mf2;
1207 struct diffstat_file *data;
1208
1209 data = diffstat_add(diffstat, name_a, name_b);
1210
1211 if (!one || !two) {
1212 data->is_unmerged = 1;
1213 return;
1214 }
1215 if (complete_rewrite) {
1216 diff_populate_filespec(one, 0);
1217 diff_populate_filespec(two, 0);
1218 data->deleted = count_lines(one->data, one->size);
1219 data->added = count_lines(two->data, two->size);
1220 return;
1221 }
1222 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1223 die("unable to read files to diff");
1224
1225 if (file_is_binary(one) || file_is_binary(two)) {
1226 data->is_binary = 1;
1227 data->added = mf2.size;
1228 data->deleted = mf1.size;
1229 } else {
1230 /* Crazy xdl interfaces.. */
1231 xpparam_t xpp;
1232 xdemitconf_t xecfg;
1233 xdemitcb_t ecb;
1234
1235 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1236 xecfg.ctxlen = 0;
1237 xecfg.flags = 0;
1238 ecb.outf = xdiff_outf;
1239 ecb.priv = diffstat;
1240 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1241 }
1242 }
1243
1244 static void builtin_checkdiff(const char *name_a, const char *name_b,
1245 struct diff_filespec *one,
1246 struct diff_filespec *two, struct diff_options *o)
1247 {
1248 mmfile_t mf1, mf2;
1249 struct checkdiff_t data;
1250
1251 if (!two)
1252 return;
1253
1254 memset(&data, 0, sizeof(data));
1255 data.xm.consume = checkdiff_consume;
1256 data.filename = name_b ? name_b : name_a;
1257 data.lineno = 0;
1258 data.color_diff = o->color_diff;
1259
1260 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1261 die("unable to read files to diff");
1262
1263 if (file_is_binary(two))
1264 return;
1265 else {
1266 /* Crazy xdl interfaces.. */
1267 xpparam_t xpp;
1268 xdemitconf_t xecfg;
1269 xdemitcb_t ecb;
1270
1271 xpp.flags = XDF_NEED_MINIMAL;
1272 xecfg.ctxlen = 0;
1273 xecfg.flags = 0;
1274 ecb.outf = xdiff_outf;
1275 ecb.priv = &data;
1276 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1277 }
1278 }
1279
1280 struct diff_filespec *alloc_filespec(const char *path)
1281 {
1282 int namelen = strlen(path);
1283 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1284
1285 memset(spec, 0, sizeof(*spec));
1286 spec->path = (char *)(spec + 1);
1287 memcpy(spec->path, path, namelen+1);
1288 return spec;
1289 }
1290
1291 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1292 unsigned short mode)
1293 {
1294 if (mode) {
1295 spec->mode = canon_mode(mode);
1296 hashcpy(spec->sha1, sha1);
1297 spec->sha1_valid = !is_null_sha1(sha1);
1298 }
1299 }
1300
1301 /*
1302 * Given a name and sha1 pair, if the dircache tells us the file in
1303 * the work tree has that object contents, return true, so that
1304 * prepare_temp_file() does not have to inflate and extract.
1305 */
1306 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1307 {
1308 struct cache_entry *ce;
1309 struct stat st;
1310 int pos, len;
1311
1312 /* We do not read the cache ourselves here, because the
1313 * benchmark with my previous version that always reads cache
1314 * shows that it makes things worse for diff-tree comparing
1315 * two linux-2.6 kernel trees in an already checked out work
1316 * tree. This is because most diff-tree comparisons deal with
1317 * only a small number of files, while reading the cache is
1318 * expensive for a large project, and its cost outweighs the
1319 * savings we get by not inflating the object to a temporary
1320 * file. Practically, this code only helps when we are used
1321 * by diff-cache --cached, which does read the cache before
1322 * calling us.
1323 */
1324 if (!active_cache)
1325 return 0;
1326
1327 /* We want to avoid the working directory if our caller
1328 * doesn't need the data in a normal file, this system
1329 * is rather slow with its stat/open/mmap/close syscalls,
1330 * and the object is contained in a pack file. The pack
1331 * is probably already open and will be faster to obtain
1332 * the data through than the working directory. Loose
1333 * objects however would tend to be slower as they need
1334 * to be individually opened and inflated.
1335 */
1336 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1337 return 0;
1338
1339 len = strlen(name);
1340 pos = cache_name_pos(name, len);
1341 if (pos < 0)
1342 return 0;
1343 ce = active_cache[pos];
1344 if ((lstat(name, &st) < 0) ||
1345 !S_ISREG(st.st_mode) || /* careful! */
1346 ce_match_stat(ce, &st, 0) ||
1347 hashcmp(sha1, ce->sha1))
1348 return 0;
1349 /* we return 1 only when we can stat, it is a regular file,
1350 * stat information matches, and sha1 recorded in the cache
1351 * matches. I.e. we know the file in the work tree really is
1352 * the same as the <name, sha1> pair.
1353 */
1354 return 1;
1355 }
1356
1357 static struct sha1_size_cache {
1358 unsigned char sha1[20];
1359 unsigned long size;
1360 } **sha1_size_cache;
1361 static int sha1_size_cache_nr, sha1_size_cache_alloc;
1362
1363 static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
1364 int find_only,
1365 unsigned long size)
1366 {
1367 int first, last;
1368 struct sha1_size_cache *e;
1369
1370 first = 0;
1371 last = sha1_size_cache_nr;
1372 while (last > first) {
1373 int cmp, next = (last + first) >> 1;
1374 e = sha1_size_cache[next];
1375 cmp = hashcmp(e->sha1, sha1);
1376 if (!cmp)
1377 return e;
1378 if (cmp < 0) {
1379 last = next;
1380 continue;
1381 }
1382 first = next+1;
1383 }
1384 /* not found */
1385 if (find_only)
1386 return NULL;
1387 /* insert to make it at "first" */
1388 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
1389 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
1390 sha1_size_cache = xrealloc(sha1_size_cache,
1391 sha1_size_cache_alloc *
1392 sizeof(*sha1_size_cache));
1393 }
1394 sha1_size_cache_nr++;
1395 if (first < sha1_size_cache_nr)
1396 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
1397 (sha1_size_cache_nr - first - 1) *
1398 sizeof(*sha1_size_cache));
1399 e = xmalloc(sizeof(struct sha1_size_cache));
1400 sha1_size_cache[first] = e;
1401 hashcpy(e->sha1, sha1);
1402 e->size = size;
1403 return e;
1404 }
1405
1406 static int populate_from_stdin(struct diff_filespec *s)
1407 {
1408 #define INCREMENT 1024
1409 char *buf;
1410 unsigned long size;
1411 int got;
1412
1413 size = 0;
1414 buf = NULL;
1415 while (1) {
1416 buf = xrealloc(buf, size + INCREMENT);
1417 got = xread(0, buf + size, INCREMENT);
1418 if (!got)
1419 break; /* EOF */
1420 if (got < 0)
1421 return error("error while reading from stdin %s",
1422 strerror(errno));
1423 size += got;
1424 }
1425 s->should_munmap = 0;
1426 s->data = buf;
1427 s->size = size;
1428 s->should_free = 1;
1429 return 0;
1430 }
1431
1432 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1433 {
1434 int len;
1435 char *data = xmalloc(100);
1436 len = snprintf(data, 100,
1437 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1438 s->data = data;
1439 s->size = len;
1440 s->should_free = 1;
1441 if (size_only) {
1442 s->data = NULL;
1443 free(data);
1444 }
1445 return 0;
1446 }
1447
1448 /*
1449 * While doing rename detection and pickaxe operation, we may need to
1450 * grab the data for the blob (or file) for our own in-core comparison.
1451 * diff_filespec has data and size fields for this purpose.
1452 */
1453 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1454 {
1455 int err = 0;
1456 if (!DIFF_FILE_VALID(s))
1457 die("internal error: asking to populate invalid file.");
1458 if (S_ISDIR(s->mode))
1459 return -1;
1460
1461 if (!use_size_cache)
1462 size_only = 0;
1463
1464 if (s->data)
1465 return err;
1466
1467 if (S_ISDIRLNK(s->mode))
1468 return diff_populate_gitlink(s, size_only);
1469
1470 if (!s->sha1_valid ||
1471 reuse_worktree_file(s->path, s->sha1, 0)) {
1472 struct stat st;
1473 int fd;
1474 char *buf;
1475 unsigned long size;
1476
1477 if (!strcmp(s->path, "-"))
1478 return populate_from_stdin(s);
1479
1480 if (lstat(s->path, &st) < 0) {
1481 if (errno == ENOENT) {
1482 err_empty:
1483 err = -1;
1484 empty:
1485 s->data = (char *)"";
1486 s->size = 0;
1487 return err;
1488 }
1489 }
1490 s->size = xsize_t(st.st_size);
1491 if (!s->size)
1492 goto empty;
1493 if (size_only)
1494 return 0;
1495 if (S_ISLNK(st.st_mode)) {
1496 int ret;
1497 s->data = xmalloc(s->size);
1498 s->should_free = 1;
1499 ret = readlink(s->path, s->data, s->size);
1500 if (ret < 0) {
1501 free(s->data);
1502 goto err_empty;
1503 }
1504 return 0;
1505 }
1506 fd = open(s->path, O_RDONLY);
1507 if (fd < 0)
1508 goto err_empty;
1509 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1510 close(fd);
1511 s->should_munmap = 1;
1512
1513 /*
1514 * Convert from working tree format to canonical git format
1515 */
1516 size = s->size;
1517 buf = convert_to_git(s->path, s->data, &size);
1518 if (buf) {
1519 munmap(s->data, s->size);
1520 s->should_munmap = 0;
1521 s->data = buf;
1522 s->size = size;
1523 s->should_free = 1;
1524 }
1525 }
1526 else {
1527 enum object_type type;
1528 struct sha1_size_cache *e;
1529
1530 if (size_only) {
1531 e = locate_size_cache(s->sha1, 1, 0);
1532 if (e) {
1533 s->size = e->size;
1534 return 0;
1535 }
1536 type = sha1_object_info(s->sha1, &s->size);
1537 if (type < 0)
1538 locate_size_cache(s->sha1, 0, s->size);
1539 }
1540 else {
1541 s->data = read_sha1_file(s->sha1, &type, &s->size);
1542 s->should_free = 1;
1543 }
1544 }
1545 return 0;
1546 }
1547
1548 void diff_free_filespec_data(struct diff_filespec *s)
1549 {
1550 if (s->should_free)
1551 free(s->data);
1552 else if (s->should_munmap)
1553 munmap(s->data, s->size);
1554 s->should_free = s->should_munmap = 0;
1555 s->data = NULL;
1556 free(s->cnt_data);
1557 s->cnt_data = NULL;
1558 }
1559
1560 static void prep_temp_blob(struct diff_tempfile *temp,
1561 void *blob,
1562 unsigned long size,
1563 const unsigned char *sha1,
1564 int mode)
1565 {
1566 int fd;
1567
1568 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
1569 if (fd < 0)
1570 die("unable to create temp-file");
1571 if (write_in_full(fd, blob, size) != size)
1572 die("unable to write temp-file");
1573 close(fd);
1574 temp->name = temp->tmp_path;
1575 strcpy(temp->hex, sha1_to_hex(sha1));
1576 temp->hex[40] = 0;
1577 sprintf(temp->mode, "%06o", mode);
1578 }
1579
1580 static void prepare_temp_file(const char *name,
1581 struct diff_tempfile *temp,
1582 struct diff_filespec *one)
1583 {
1584 if (!DIFF_FILE_VALID(one)) {
1585 not_a_valid_file:
1586 /* A '-' entry produces this for file-2, and
1587 * a '+' entry produces this for file-1.
1588 */
1589 temp->name = "/dev/null";
1590 strcpy(temp->hex, ".");
1591 strcpy(temp->mode, ".");
1592 return;
1593 }
1594
1595 if (!one->sha1_valid ||
1596 reuse_worktree_file(name, one->sha1, 1)) {
1597 struct stat st;
1598 if (lstat(name, &st) < 0) {
1599 if (errno == ENOENT)
1600 goto not_a_valid_file;
1601 die("stat(%s): %s", name, strerror(errno));
1602 }
1603 if (S_ISLNK(st.st_mode)) {
1604 int ret;
1605 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1606 size_t sz = xsize_t(st.st_size);
1607 if (sizeof(buf) <= st.st_size)
1608 die("symlink too long: %s", name);
1609 ret = readlink(name, buf, sz);
1610 if (ret < 0)
1611 die("readlink(%s)", name);
1612 prep_temp_blob(temp, buf, sz,
1613 (one->sha1_valid ?
1614 one->sha1 : null_sha1),
1615 (one->sha1_valid ?
1616 one->mode : S_IFLNK));
1617 }
1618 else {
1619 /* we can borrow from the file in the work tree */
1620 temp->name = name;
1621 if (!one->sha1_valid)
1622 strcpy(temp->hex, sha1_to_hex(null_sha1));
1623 else
1624 strcpy(temp->hex, sha1_to_hex(one->sha1));
1625 /* Even though we may sometimes borrow the
1626 * contents from the work tree, we always want
1627 * one->mode. mode is trustworthy even when
1628 * !(one->sha1_valid), as long as
1629 * DIFF_FILE_VALID(one).
1630 */
1631 sprintf(temp->mode, "%06o", one->mode);
1632 }
1633 return;
1634 }
1635 else {
1636 if (diff_populate_filespec(one, 0))
1637 die("cannot read data blob for %s", one->path);
1638 prep_temp_blob(temp, one->data, one->size,
1639 one->sha1, one->mode);
1640 }
1641 }
1642
1643 static void remove_tempfile(void)
1644 {
1645 int i;
1646
1647 for (i = 0; i < 2; i++)
1648 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1649 unlink(diff_temp[i].name);
1650 diff_temp[i].name = NULL;
1651 }
1652 }
1653
1654 static void remove_tempfile_on_signal(int signo)
1655 {
1656 remove_tempfile();
1657 signal(SIGINT, SIG_DFL);
1658 raise(signo);
1659 }
1660
1661 static int spawn_prog(const char *pgm, const char **arg)
1662 {
1663 pid_t pid;
1664 int status;
1665
1666 fflush(NULL);
1667 pid = fork();
1668 if (pid < 0)
1669 die("unable to fork");
1670 if (!pid) {
1671 execvp(pgm, (char *const*) arg);
1672 exit(255);
1673 }
1674
1675 while (waitpid(pid, &status, 0) < 0) {
1676 if (errno == EINTR)
1677 continue;
1678 return -1;
1679 }
1680
1681 /* Earlier we did not check the exit status because
1682 * diff exits non-zero if files are different, and
1683 * we are not interested in knowing that. It was a
1684 * mistake which made it harder to quit a diff-*
1685 * session that uses the git-apply-patch-script as
1686 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1687 * should also exit non-zero only when it wants to
1688 * abort the entire diff-* session.
1689 */
1690 if (WIFEXITED(status) && !WEXITSTATUS(status))
1691 return 0;
1692 return -1;
1693 }
1694
1695 /* An external diff command takes:
1696 *
1697 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1698 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1699 *
1700 */
1701 static void run_external_diff(const char *pgm,
1702 const char *name,
1703 const char *other,
1704 struct diff_filespec *one,
1705 struct diff_filespec *two,
1706 const char *xfrm_msg,
1707 int complete_rewrite)
1708 {
1709 const char *spawn_arg[10];
1710 struct diff_tempfile *temp = diff_temp;
1711 int retval;
1712 static int atexit_asked = 0;
1713 const char *othername;
1714 const char **arg = &spawn_arg[0];
1715
1716 othername = (other? other : name);
1717 if (one && two) {
1718 prepare_temp_file(name, &temp[0], one);
1719 prepare_temp_file(othername, &temp[1], two);
1720 if (! atexit_asked &&
1721 (temp[0].name == temp[0].tmp_path ||
1722 temp[1].name == temp[1].tmp_path)) {
1723 atexit_asked = 1;
1724 atexit(remove_tempfile);
1725 }
1726 signal(SIGINT, remove_tempfile_on_signal);
1727 }
1728
1729 if (one && two) {
1730 *arg++ = pgm;
1731 *arg++ = name;
1732 *arg++ = temp[0].name;
1733 *arg++ = temp[0].hex;
1734 *arg++ = temp[0].mode;
1735 *arg++ = temp[1].name;
1736 *arg++ = temp[1].hex;
1737 *arg++ = temp[1].mode;
1738 if (other) {
1739 *arg++ = other;
1740 *arg++ = xfrm_msg;
1741 }
1742 } else {
1743 *arg++ = pgm;
1744 *arg++ = name;
1745 }
1746 *arg = NULL;
1747 retval = spawn_prog(pgm, spawn_arg);
1748 remove_tempfile();
1749 if (retval) {
1750 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1751 exit(1);
1752 }
1753 }
1754
1755 static void run_diff_cmd(const char *pgm,
1756 const char *name,
1757 const char *other,
1758 struct diff_filespec *one,
1759 struct diff_filespec *two,
1760 const char *xfrm_msg,
1761 struct diff_options *o,
1762 int complete_rewrite)
1763 {
1764 if (pgm) {
1765 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1766 complete_rewrite);
1767 return;
1768 }
1769 if (one && two)
1770 builtin_diff(name, other ? other : name,
1771 one, two, xfrm_msg, o, complete_rewrite);
1772 else
1773 printf("* Unmerged path %s\n", name);
1774 }
1775
1776 static void diff_fill_sha1_info(struct diff_filespec *one)
1777 {
1778 if (DIFF_FILE_VALID(one)) {
1779 if (!one->sha1_valid) {
1780 struct stat st;
1781 if (!strcmp(one->path, "-")) {
1782 hashcpy(one->sha1, null_sha1);
1783 return;
1784 }
1785 if (lstat(one->path, &st) < 0)
1786 die("stat %s", one->path);
1787 if (index_path(one->sha1, one->path, &st, 0))
1788 die("cannot hash %s\n", one->path);
1789 }
1790 }
1791 else
1792 hashclr(one->sha1);
1793 }
1794
1795 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1796 {
1797 const char *pgm = external_diff();
1798 char msg[PATH_MAX*2+300], *xfrm_msg;
1799 struct diff_filespec *one;
1800 struct diff_filespec *two;
1801 const char *name;
1802 const char *other;
1803 char *name_munged, *other_munged;
1804 int complete_rewrite = 0;
1805 int len;
1806
1807 if (DIFF_PAIR_UNMERGED(p)) {
1808 /* unmerged */
1809 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1810 return;
1811 }
1812
1813 name = p->one->path;
1814 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1815 name_munged = quote_one(name);
1816 other_munged = quote_one(other);
1817 one = p->one; two = p->two;
1818
1819 diff_fill_sha1_info(one);
1820 diff_fill_sha1_info(two);
1821
1822 len = 0;
1823 switch (p->status) {
1824 case DIFF_STATUS_COPIED:
1825 len += snprintf(msg + len, sizeof(msg) - len,
1826 "similarity index %d%%\n"
1827 "copy from %s\n"
1828 "copy to %s\n",
1829 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1830 name_munged, other_munged);
1831 break;
1832 case DIFF_STATUS_RENAMED:
1833 len += snprintf(msg + len, sizeof(msg) - len,
1834 "similarity index %d%%\n"
1835 "rename from %s\n"
1836 "rename to %s\n",
1837 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1838 name_munged, other_munged);
1839 break;
1840 case DIFF_STATUS_MODIFIED:
1841 if (p->score) {
1842 len += snprintf(msg + len, sizeof(msg) - len,
1843 "dissimilarity index %d%%\n",
1844 (int)(0.5 + p->score *
1845 100.0/MAX_SCORE));
1846 complete_rewrite = 1;
1847 break;
1848 }
1849 /* fallthru */
1850 default:
1851 /* nothing */
1852 ;
1853 }
1854
1855 if (hashcmp(one->sha1, two->sha1)) {
1856 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1857
1858 if (o->binary) {
1859 mmfile_t mf;
1860 if ((!fill_mmfile(&mf, one) && file_is_binary(one)) ||
1861 (!fill_mmfile(&mf, two) && file_is_binary(two)))
1862 abbrev = 40;
1863 }
1864 len += snprintf(msg + len, sizeof(msg) - len,
1865 "index %.*s..%.*s",
1866 abbrev, sha1_to_hex(one->sha1),
1867 abbrev, sha1_to_hex(two->sha1));
1868 if (one->mode == two->mode)
1869 len += snprintf(msg + len, sizeof(msg) - len,
1870 " %06o", one->mode);
1871 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1872 }
1873
1874 if (len)
1875 msg[--len] = 0;
1876 xfrm_msg = len ? msg : NULL;
1877
1878 if (!pgm &&
1879 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1880 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1881 /* a filepair that changes between file and symlink
1882 * needs to be split into deletion and creation.
1883 */
1884 struct diff_filespec *null = alloc_filespec(two->path);
1885 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1886 free(null);
1887 null = alloc_filespec(one->path);
1888 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1889 free(null);
1890 }
1891 else
1892 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1893 complete_rewrite);
1894
1895 free(name_munged);
1896 free(other_munged);
1897 }
1898
1899 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1900 struct diffstat_t *diffstat)
1901 {
1902 const char *name;
1903 const char *other;
1904 int complete_rewrite = 0;
1905
1906 if (DIFF_PAIR_UNMERGED(p)) {
1907 /* unmerged */
1908 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1909 return;
1910 }
1911
1912 name = p->one->path;
1913 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1914
1915 diff_fill_sha1_info(p->one);
1916 diff_fill_sha1_info(p->two);
1917
1918 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1919 complete_rewrite = 1;
1920 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
1921 }
1922
1923 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1924 {
1925 const char *name;
1926 const char *other;
1927
1928 if (DIFF_PAIR_UNMERGED(p)) {
1929 /* unmerged */
1930 return;
1931 }
1932
1933 name = p->one->path;
1934 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1935
1936 diff_fill_sha1_info(p->one);
1937 diff_fill_sha1_info(p->two);
1938
1939 builtin_checkdiff(name, other, p->one, p->two, o);
1940 }
1941
1942 void diff_setup(struct diff_options *options)
1943 {
1944 memset(options, 0, sizeof(*options));
1945 options->line_termination = '\n';
1946 options->break_opt = -1;
1947 options->rename_limit = -1;
1948 options->context = 3;
1949 options->msg_sep = "";
1950
1951 options->change = diff_change;
1952 options->add_remove = diff_addremove;
1953 options->color_diff = diff_use_color_default;
1954 options->detect_rename = diff_detect_rename_default;
1955 }
1956
1957 int diff_setup_done(struct diff_options *options)
1958 {
1959 int count = 0;
1960
1961 if (options->output_format & DIFF_FORMAT_NAME)
1962 count++;
1963 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
1964 count++;
1965 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
1966 count++;
1967 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
1968 count++;
1969 if (count > 1)
1970 die("--name-only, --name-status, --check and -s are mutually exclusive");
1971
1972 if (options->find_copies_harder)
1973 options->detect_rename = DIFF_DETECT_COPY;
1974
1975 if (options->output_format & (DIFF_FORMAT_NAME |
1976 DIFF_FORMAT_NAME_STATUS |
1977 DIFF_FORMAT_CHECKDIFF |
1978 DIFF_FORMAT_NO_OUTPUT))
1979 options->output_format &= ~(DIFF_FORMAT_RAW |
1980 DIFF_FORMAT_NUMSTAT |
1981 DIFF_FORMAT_DIFFSTAT |
1982 DIFF_FORMAT_SHORTSTAT |
1983 DIFF_FORMAT_SUMMARY |
1984 DIFF_FORMAT_PATCH);
1985
1986 /*
1987 * These cases always need recursive; we do not drop caller-supplied
1988 * recursive bits for other formats here.
1989 */
1990 if (options->output_format & (DIFF_FORMAT_PATCH |
1991 DIFF_FORMAT_NUMSTAT |
1992 DIFF_FORMAT_DIFFSTAT |
1993 DIFF_FORMAT_SHORTSTAT |
1994 DIFF_FORMAT_SUMMARY |
1995 DIFF_FORMAT_CHECKDIFF))
1996 options->recursive = 1;
1997 /*
1998 * Also pickaxe would not work very well if you do not say recursive
1999 */
2000 if (options->pickaxe)
2001 options->recursive = 1;
2002
2003 if (options->detect_rename && options->rename_limit < 0)
2004 options->rename_limit = diff_rename_limit_default;
2005 if (options->setup & DIFF_SETUP_USE_CACHE) {
2006 if (!active_cache)
2007 /* read-cache does not die even when it fails
2008 * so it is safe for us to do this here. Also
2009 * it does not smudge active_cache or active_nr
2010 * when it fails, so we do not have to worry about
2011 * cleaning it up ourselves either.
2012 */
2013 read_cache();
2014 }
2015 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
2016 use_size_cache = 1;
2017 if (options->abbrev <= 0 || 40 < options->abbrev)
2018 options->abbrev = 40; /* full */
2019
2020 /*
2021 * It does not make sense to show the first hit we happened
2022 * to have found. It does not make sense not to return with
2023 * exit code in such a case either.
2024 */
2025 if (options->quiet) {
2026 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2027 options->exit_with_status = 1;
2028 }
2029
2030 /*
2031 * If we postprocess in diffcore, we cannot simply return
2032 * upon the first hit. We need to run diff as usual.
2033 */
2034 if (options->pickaxe || options->filter)
2035 options->quiet = 0;
2036
2037 return 0;
2038 }
2039
2040 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2041 {
2042 char c, *eq;
2043 int len;
2044
2045 if (*arg != '-')
2046 return 0;
2047 c = *++arg;
2048 if (!c)
2049 return 0;
2050 if (c == arg_short) {
2051 c = *++arg;
2052 if (!c)
2053 return 1;
2054 if (val && isdigit(c)) {
2055 char *end;
2056 int n = strtoul(arg, &end, 10);
2057 if (*end)
2058 return 0;
2059 *val = n;
2060 return 1;
2061 }
2062 return 0;
2063 }
2064 if (c != '-')
2065 return 0;
2066 arg++;
2067 eq = strchr(arg, '=');
2068 if (eq)
2069 len = eq - arg;
2070 else
2071 len = strlen(arg);
2072 if (!len || strncmp(arg, arg_long, len))
2073 return 0;
2074 if (eq) {
2075 int n;
2076 char *end;
2077 if (!isdigit(*++eq))
2078 return 0;
2079 n = strtoul(eq, &end, 10);
2080 if (*end)
2081 return 0;
2082 *val = n;
2083 }
2084 return 1;
2085 }
2086
2087 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2088 {
2089 const char *arg = av[0];
2090 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2091 options->output_format |= DIFF_FORMAT_PATCH;
2092 else if (opt_arg(arg, 'U', "unified", &options->context))
2093 options->output_format |= DIFF_FORMAT_PATCH;
2094 else if (!strcmp(arg, "--raw"))
2095 options->output_format |= DIFF_FORMAT_RAW;
2096 else if (!strcmp(arg, "--patch-with-raw")) {
2097 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2098 }
2099 else if (!strcmp(arg, "--numstat")) {
2100 options->output_format |= DIFF_FORMAT_NUMSTAT;
2101 }
2102 else if (!strcmp(arg, "--shortstat")) {
2103 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2104 }
2105 else if (!prefixcmp(arg, "--stat")) {
2106 char *end;
2107 int width = options->stat_width;
2108 int name_width = options->stat_name_width;
2109 arg += 6;
2110 end = (char *)arg;
2111
2112 switch (*arg) {
2113 case '-':
2114 if (!prefixcmp(arg, "-width="))
2115 width = strtoul(arg + 7, &end, 10);
2116 else if (!prefixcmp(arg, "-name-width="))
2117 name_width = strtoul(arg + 12, &end, 10);
2118 break;
2119 case '=':
2120 width = strtoul(arg+1, &end, 10);
2121 if (*end == ',')
2122 name_width = strtoul(end+1, &end, 10);
2123 }
2124
2125 /* Important! This checks all the error cases! */
2126 if (*end)
2127 return 0;
2128 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2129 options->stat_name_width = name_width;
2130 options->stat_width = width;
2131 }
2132 else if (!strcmp(arg, "--check"))
2133 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2134 else if (!strcmp(arg, "--summary"))
2135 options->output_format |= DIFF_FORMAT_SUMMARY;
2136 else if (!strcmp(arg, "--patch-with-stat")) {
2137 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2138 }
2139 else if (!strcmp(arg, "-z"))
2140 options->line_termination = 0;
2141 else if (!prefixcmp(arg, "-l"))
2142 options->rename_limit = strtoul(arg+2, NULL, 10);
2143 else if (!strcmp(arg, "--full-index"))
2144 options->full_index = 1;
2145 else if (!strcmp(arg, "--binary")) {
2146 options->output_format |= DIFF_FORMAT_PATCH;
2147 options->binary = 1;
2148 }
2149 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
2150 options->text = 1;
2151 }
2152 else if (!strcmp(arg, "--name-only"))
2153 options->output_format |= DIFF_FORMAT_NAME;
2154 else if (!strcmp(arg, "--name-status"))
2155 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2156 else if (!strcmp(arg, "-R"))
2157 options->reverse_diff = 1;
2158 else if (!prefixcmp(arg, "-S"))
2159 options->pickaxe = arg + 2;
2160 else if (!strcmp(arg, "-s")) {
2161 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2162 }
2163 else if (!prefixcmp(arg, "-O"))
2164 options->orderfile = arg + 2;
2165 else if (!prefixcmp(arg, "--diff-filter="))
2166 options->filter = arg + 14;
2167 else if (!strcmp(arg, "--pickaxe-all"))
2168 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2169 else if (!strcmp(arg, "--pickaxe-regex"))
2170 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2171 else if (!prefixcmp(arg, "-B")) {
2172 if ((options->break_opt =
2173 diff_scoreopt_parse(arg)) == -1)
2174 return -1;
2175 }
2176 else if (!prefixcmp(arg, "-M")) {
2177 if ((options->rename_score =
2178 diff_scoreopt_parse(arg)) == -1)
2179 return -1;
2180 options->detect_rename = DIFF_DETECT_RENAME;
2181 }
2182 else if (!prefixcmp(arg, "-C")) {
2183 if ((options->rename_score =
2184 diff_scoreopt_parse(arg)) == -1)
2185 return -1;
2186 options->detect_rename = DIFF_DETECT_COPY;
2187 }
2188 else if (!strcmp(arg, "--find-copies-harder"))
2189 options->find_copies_harder = 1;
2190 else if (!strcmp(arg, "--abbrev"))
2191 options->abbrev = DEFAULT_ABBREV;
2192 else if (!prefixcmp(arg, "--abbrev=")) {
2193 options->abbrev = strtoul(arg + 9, NULL, 10);
2194 if (options->abbrev < MINIMUM_ABBREV)
2195 options->abbrev = MINIMUM_ABBREV;
2196 else if (40 < options->abbrev)
2197 options->abbrev = 40;
2198 }
2199 else if (!strcmp(arg, "--color"))
2200 options->color_diff = 1;
2201 else if (!strcmp(arg, "--no-color"))
2202 options->color_diff = 0;
2203 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2204 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2205 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2206 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2207 else if (!strcmp(arg, "--ignore-space-at-eol"))
2208 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2209 else if (!strcmp(arg, "--color-words"))
2210 options->color_diff = options->color_diff_words = 1;
2211 else if (!strcmp(arg, "--no-renames"))
2212 options->detect_rename = 0;
2213 else if (!strcmp(arg, "--exit-code"))
2214 options->exit_with_status = 1;
2215 else if (!strcmp(arg, "--quiet"))
2216 options->quiet = 1;
2217 else
2218 return 0;
2219 return 1;
2220 }
2221
2222 static int parse_num(const char **cp_p)
2223 {
2224 unsigned long num, scale;
2225 int ch, dot;
2226 const char *cp = *cp_p;
2227
2228 num = 0;
2229 scale = 1;
2230 dot = 0;
2231 for(;;) {
2232 ch = *cp;
2233 if ( !dot && ch == '.' ) {
2234 scale = 1;
2235 dot = 1;
2236 } else if ( ch == '%' ) {
2237 scale = dot ? scale*100 : 100;
2238 cp++; /* % is always at the end */
2239 break;
2240 } else if ( ch >= '0' && ch <= '9' ) {
2241 if ( scale < 100000 ) {
2242 scale *= 10;
2243 num = (num*10) + (ch-'0');
2244 }
2245 } else {
2246 break;
2247 }
2248 cp++;
2249 }
2250 *cp_p = cp;
2251
2252 /* user says num divided by scale and we say internally that
2253 * is MAX_SCORE * num / scale.
2254 */
2255 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2256 }
2257
2258 int diff_scoreopt_parse(const char *opt)
2259 {
2260 int opt1, opt2, cmd;
2261
2262 if (*opt++ != '-')
2263 return -1;
2264 cmd = *opt++;
2265 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2266 return -1; /* that is not a -M, -C nor -B option */
2267
2268 opt1 = parse_num(&opt);
2269 if (cmd != 'B')
2270 opt2 = 0;
2271 else {
2272 if (*opt == 0)
2273 opt2 = 0;
2274 else if (*opt != '/')
2275 return -1; /* we expect -B80/99 or -B80 */
2276 else {
2277 opt++;
2278 opt2 = parse_num(&opt);
2279 }
2280 }
2281 if (*opt != 0)
2282 return -1;
2283 return opt1 | (opt2 << 16);
2284 }
2285
2286 struct diff_queue_struct diff_queued_diff;
2287
2288 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2289 {
2290 if (queue->alloc <= queue->nr) {
2291 queue->alloc = alloc_nr(queue->alloc);
2292 queue->queue = xrealloc(queue->queue,
2293 sizeof(dp) * queue->alloc);
2294 }
2295 queue->queue[queue->nr++] = dp;
2296 }
2297
2298 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2299 struct diff_filespec *one,
2300 struct diff_filespec *two)
2301 {
2302 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2303 dp->one = one;
2304 dp->two = two;
2305 if (queue)
2306 diff_q(queue, dp);
2307 return dp;
2308 }
2309
2310 void diff_free_filepair(struct diff_filepair *p)
2311 {
2312 diff_free_filespec_data(p->one);
2313 diff_free_filespec_data(p->two);
2314 free(p->one);
2315 free(p->two);
2316 free(p);
2317 }
2318
2319 /* This is different from find_unique_abbrev() in that
2320 * it stuffs the result with dots for alignment.
2321 */
2322 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2323 {
2324 int abblen;
2325 const char *abbrev;
2326 if (len == 40)
2327 return sha1_to_hex(sha1);
2328
2329 abbrev = find_unique_abbrev(sha1, len);
2330 if (!abbrev)
2331 return sha1_to_hex(sha1);
2332 abblen = strlen(abbrev);
2333 if (abblen < 37) {
2334 static char hex[41];
2335 if (len < abblen && abblen <= len + 2)
2336 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2337 else
2338 sprintf(hex, "%s...", abbrev);
2339 return hex;
2340 }
2341 return sha1_to_hex(sha1);
2342 }
2343
2344 static void diff_flush_raw(struct diff_filepair *p,
2345 struct diff_options *options)
2346 {
2347 int two_paths;
2348 char status[10];
2349 int abbrev = options->abbrev;
2350 const char *path_one, *path_two;
2351 int inter_name_termination = '\t';
2352 int line_termination = options->line_termination;
2353
2354 if (!line_termination)
2355 inter_name_termination = 0;
2356
2357 path_one = p->one->path;
2358 path_two = p->two->path;
2359 if (line_termination) {
2360 path_one = quote_one(path_one);
2361 path_two = quote_one(path_two);
2362 }
2363
2364 if (p->score)
2365 sprintf(status, "%c%03d", p->status,
2366 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2367 else {
2368 status[0] = p->status;
2369 status[1] = 0;
2370 }
2371 switch (p->status) {
2372 case DIFF_STATUS_COPIED:
2373 case DIFF_STATUS_RENAMED:
2374 two_paths = 1;
2375 break;
2376 case DIFF_STATUS_ADDED:
2377 case DIFF_STATUS_DELETED:
2378 two_paths = 0;
2379 break;
2380 default:
2381 two_paths = 0;
2382 break;
2383 }
2384 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
2385 printf(":%06o %06o %s ",
2386 p->one->mode, p->two->mode,
2387 diff_unique_abbrev(p->one->sha1, abbrev));
2388 printf("%s ",
2389 diff_unique_abbrev(p->two->sha1, abbrev));
2390 }
2391 printf("%s%c%s", status, inter_name_termination, path_one);
2392 if (two_paths)
2393 printf("%c%s", inter_name_termination, path_two);
2394 putchar(line_termination);
2395 if (path_one != p->one->path)
2396 free((void*)path_one);
2397 if (path_two != p->two->path)
2398 free((void*)path_two);
2399 }
2400
2401 static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
2402 {
2403 char *path = p->two->path;
2404
2405 if (opt->line_termination)
2406 path = quote_one(p->two->path);
2407 printf("%s%c", path, opt->line_termination);
2408 if (p->two->path != path)
2409 free(path);
2410 }
2411
2412 int diff_unmodified_pair(struct diff_filepair *p)
2413 {
2414 /* This function is written stricter than necessary to support
2415 * the currently implemented transformers, but the idea is to
2416 * let transformers to produce diff_filepairs any way they want,
2417 * and filter and clean them up here before producing the output.
2418 */
2419 struct diff_filespec *one, *two;
2420
2421 if (DIFF_PAIR_UNMERGED(p))
2422 return 0; /* unmerged is interesting */
2423
2424 one = p->one;
2425 two = p->two;
2426
2427 /* deletion, addition, mode or type change
2428 * and rename are all interesting.
2429 */
2430 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2431 DIFF_PAIR_MODE_CHANGED(p) ||
2432 strcmp(one->path, two->path))
2433 return 0;
2434
2435 /* both are valid and point at the same path. that is, we are
2436 * dealing with a change.
2437 */
2438 if (one->sha1_valid && two->sha1_valid &&
2439 !hashcmp(one->sha1, two->sha1))
2440 return 1; /* no change */
2441 if (!one->sha1_valid && !two->sha1_valid)
2442 return 1; /* both look at the same file on the filesystem. */
2443 return 0;
2444 }
2445
2446 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2447 {
2448 if (diff_unmodified_pair(p))
2449 return;
2450
2451 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2452 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2453 return; /* no tree diffs in patch format */
2454
2455 run_diff(p, o);
2456 }
2457
2458 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2459 struct diffstat_t *diffstat)
2460 {
2461 if (diff_unmodified_pair(p))
2462 return;
2463
2464 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2465 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2466 return; /* no tree diffs in patch format */
2467
2468 run_diffstat(p, o, diffstat);
2469 }
2470
2471 static void diff_flush_checkdiff(struct diff_filepair *p,
2472 struct diff_options *o)
2473 {
2474 if (diff_unmodified_pair(p))
2475 return;
2476
2477 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2478 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2479 return; /* no tree diffs in patch format */
2480
2481 run_checkdiff(p, o);
2482 }
2483
2484 int diff_queue_is_empty(void)
2485 {
2486 struct diff_queue_struct *q = &diff_queued_diff;
2487 int i;
2488 for (i = 0; i < q->nr; i++)
2489 if (!diff_unmodified_pair(q->queue[i]))
2490 return 0;
2491 return 1;
2492 }
2493
2494 #if DIFF_DEBUG
2495 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2496 {
2497 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2498 x, one ? one : "",
2499 s->path,
2500 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2501 s->mode,
2502 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2503 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2504 x, one ? one : "",
2505 s->size, s->xfrm_flags);
2506 }
2507
2508 void diff_debug_filepair(const struct diff_filepair *p, int i)
2509 {
2510 diff_debug_filespec(p->one, i, "one");
2511 diff_debug_filespec(p->two, i, "two");
2512 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2513 p->score, p->status ? p->status : '?',
2514 p->source_stays, p->broken_pair);
2515 }
2516
2517 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2518 {
2519 int i;
2520 if (msg)
2521 fprintf(stderr, "%s\n", msg);
2522 fprintf(stderr, "q->nr = %d\n", q->nr);
2523 for (i = 0; i < q->nr; i++) {
2524 struct diff_filepair *p = q->queue[i];
2525 diff_debug_filepair(p, i);
2526 }
2527 }
2528 #endif
2529
2530 static void diff_resolve_rename_copy(void)
2531 {
2532 int i, j;
2533 struct diff_filepair *p, *pp;
2534 struct diff_queue_struct *q = &diff_queued_diff;
2535
2536 diff_debug_queue("resolve-rename-copy", q);
2537
2538 for (i = 0; i < q->nr; i++) {
2539 p = q->queue[i];
2540 p->status = 0; /* undecided */
2541 if (DIFF_PAIR_UNMERGED(p))
2542 p->status = DIFF_STATUS_UNMERGED;
2543 else if (!DIFF_FILE_VALID(p->one))
2544 p->status = DIFF_STATUS_ADDED;
2545 else if (!DIFF_FILE_VALID(p->two))
2546 p->status = DIFF_STATUS_DELETED;
2547 else if (DIFF_PAIR_TYPE_CHANGED(p))
2548 p->status = DIFF_STATUS_TYPE_CHANGED;
2549
2550 /* from this point on, we are dealing with a pair
2551 * whose both sides are valid and of the same type, i.e.
2552 * either in-place edit or rename/copy edit.
2553 */
2554 else if (DIFF_PAIR_RENAME(p)) {
2555 if (p->source_stays) {
2556 p->status = DIFF_STATUS_COPIED;
2557 continue;
2558 }
2559 /* See if there is some other filepair that
2560 * copies from the same source as us. If so
2561 * we are a copy. Otherwise we are either a
2562 * copy if the path stays, or a rename if it
2563 * does not, but we already handled "stays" case.
2564 */
2565 for (j = i + 1; j < q->nr; j++) {
2566 pp = q->queue[j];
2567 if (strcmp(pp->one->path, p->one->path))
2568 continue; /* not us */
2569 if (!DIFF_PAIR_RENAME(pp))
2570 continue; /* not a rename/copy */
2571 /* pp is a rename/copy from the same source */
2572 p->status = DIFF_STATUS_COPIED;
2573 break;
2574 }
2575 if (!p->status)
2576 p->status = DIFF_STATUS_RENAMED;
2577 }
2578 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2579 p->one->mode != p->two->mode ||
2580 is_null_sha1(p->one->sha1))
2581 p->status = DIFF_STATUS_MODIFIED;
2582 else {
2583 /* This is a "no-change" entry and should not
2584 * happen anymore, but prepare for broken callers.
2585 */
2586 error("feeding unmodified %s to diffcore",
2587 p->one->path);
2588 p->status = DIFF_STATUS_UNKNOWN;
2589 }
2590 }
2591 diff_debug_queue("resolve-rename-copy done", q);
2592 }
2593
2594 static int check_pair_status(struct diff_filepair *p)
2595 {
2596 switch (p->status) {
2597 case DIFF_STATUS_UNKNOWN:
2598 return 0;
2599 case 0:
2600 die("internal error in diff-resolve-rename-copy");
2601 default:
2602 return 1;
2603 }
2604 }
2605
2606 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2607 {
2608 int fmt = opt->output_format;
2609
2610 if (fmt & DIFF_FORMAT_CHECKDIFF)
2611 diff_flush_checkdiff(p, opt);
2612 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2613 diff_flush_raw(p, opt);
2614 else if (fmt & DIFF_FORMAT_NAME)
2615 diff_flush_name(p, opt);
2616 }
2617
2618 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2619 {
2620 char *name = quote_one(fs->path);
2621 if (fs->mode)
2622 printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
2623 else
2624 printf(" %s %s\n", newdelete, name);
2625 free(name);
2626 }
2627
2628
2629 static void show_mode_change(struct diff_filepair *p, int show_name)
2630 {
2631 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2632 if (show_name) {
2633 char *name = quote_one(p->two->path);
2634 printf(" mode change %06o => %06o %s\n",
2635 p->one->mode, p->two->mode, name);
2636 free(name);
2637 }
2638 else
2639 printf(" mode change %06o => %06o\n",
2640 p->one->mode, p->two->mode);
2641 }
2642 }
2643
2644 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2645 {
2646 char *names = pprint_rename(p->one->path, p->two->path);
2647
2648 printf(" %s %s (%d%%)\n", renamecopy, names,
2649 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2650 free(names);
2651 show_mode_change(p, 0);
2652 }
2653
2654 static void diff_summary(struct diff_filepair *p)
2655 {
2656 switch(p->status) {
2657 case DIFF_STATUS_DELETED:
2658 show_file_mode_name("delete", p->one);
2659 break;
2660 case DIFF_STATUS_ADDED:
2661 show_file_mode_name("create", p->two);
2662 break;
2663 case DIFF_STATUS_COPIED:
2664 show_rename_copy("copy", p);
2665 break;
2666 case DIFF_STATUS_RENAMED:
2667 show_rename_copy("rename", p);
2668 break;
2669 default:
2670 if (p->score) {
2671 char *name = quote_one(p->two->path);
2672 printf(" rewrite %s (%d%%)\n", name,
2673 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2674 free(name);
2675 show_mode_change(p, 0);
2676 } else show_mode_change(p, 1);
2677 break;
2678 }
2679 }
2680
2681 struct patch_id_t {
2682 struct xdiff_emit_state xm;
2683 SHA_CTX *ctx;
2684 int patchlen;
2685 };
2686
2687 static int remove_space(char *line, int len)
2688 {
2689 int i;
2690 char *dst = line;
2691 unsigned char c;
2692
2693 for (i = 0; i < len; i++)
2694 if (!isspace((c = line[i])))
2695 *dst++ = c;
2696
2697 return dst - line;
2698 }
2699
2700 static void patch_id_consume(void *priv, char *line, unsigned long len)
2701 {
2702 struct patch_id_t *data = priv;
2703 int new_len;
2704
2705 /* Ignore line numbers when computing the SHA1 of the patch */
2706 if (!prefixcmp(line, "@@ -"))
2707 return;
2708
2709 new_len = remove_space(line, len);
2710
2711 SHA1_Update(data->ctx, line, new_len);
2712 data->patchlen += new_len;
2713 }
2714
2715 /* returns 0 upon success, and writes result into sha1 */
2716 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2717 {
2718 struct diff_queue_struct *q = &diff_queued_diff;
2719 int i;
2720 SHA_CTX ctx;
2721 struct patch_id_t data;
2722 char buffer[PATH_MAX * 4 + 20];
2723
2724 SHA1_Init(&ctx);
2725 memset(&data, 0, sizeof(struct patch_id_t));
2726 data.ctx = &ctx;
2727 data.xm.consume = patch_id_consume;
2728
2729 for (i = 0; i < q->nr; i++) {
2730 xpparam_t xpp;
2731 xdemitconf_t xecfg;
2732 xdemitcb_t ecb;
2733 mmfile_t mf1, mf2;
2734 struct diff_filepair *p = q->queue[i];
2735 int len1, len2;
2736
2737 if (p->status == 0)
2738 return error("internal diff status error");
2739 if (p->status == DIFF_STATUS_UNKNOWN)
2740 continue;
2741 if (diff_unmodified_pair(p))
2742 continue;
2743 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2744 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2745 continue;
2746 if (DIFF_PAIR_UNMERGED(p))
2747 continue;
2748
2749 diff_fill_sha1_info(p->one);
2750 diff_fill_sha1_info(p->two);
2751 if (fill_mmfile(&mf1, p->one) < 0 ||
2752 fill_mmfile(&mf2, p->two) < 0)
2753 return error("unable to read files to diff");
2754
2755 /* Maybe hash p->two? into the patch id? */
2756 if (file_is_binary(p->two))
2757 continue;
2758
2759 len1 = remove_space(p->one->path, strlen(p->one->path));
2760 len2 = remove_space(p->two->path, strlen(p->two->path));
2761 if (p->one->mode == 0)
2762 len1 = snprintf(buffer, sizeof(buffer),
2763 "diff--gita/%.*sb/%.*s"
2764 "newfilemode%06o"
2765 "---/dev/null"
2766 "+++b/%.*s",
2767 len1, p->one->path,
2768 len2, p->two->path,
2769 p->two->mode,
2770 len2, p->two->path);
2771 else if (p->two->mode == 0)
2772 len1 = snprintf(buffer, sizeof(buffer),
2773 "diff--gita/%.*sb/%.*s"
2774 "deletedfilemode%06o"
2775 "---a/%.*s"
2776 "+++/dev/null",
2777 len1, p->one->path,
2778 len2, p->two->path,
2779 p->one->mode,
2780 len1, p->one->path);
2781 else
2782 len1 = snprintf(buffer, sizeof(buffer),
2783 "diff--gita/%.*sb/%.*s"
2784 "---a/%.*s"
2785 "+++b/%.*s",
2786 len1, p->one->path,
2787 len2, p->two->path,
2788 len1, p->one->path,
2789 len2, p->two->path);
2790 SHA1_Update(&ctx, buffer, len1);
2791
2792 xpp.flags = XDF_NEED_MINIMAL;
2793 xecfg.ctxlen = 3;
2794 xecfg.flags = XDL_EMIT_FUNCNAMES;
2795 ecb.outf = xdiff_outf;
2796 ecb.priv = &data;
2797 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2798 }
2799
2800 SHA1_Final(sha1, &ctx);
2801 return 0;
2802 }
2803
2804 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2805 {
2806 struct diff_queue_struct *q = &diff_queued_diff;
2807 int i;
2808 int result = diff_get_patch_id(options, sha1);
2809
2810 for (i = 0; i < q->nr; i++)
2811 diff_free_filepair(q->queue[i]);
2812
2813 free(q->queue);
2814 q->queue = NULL;
2815 q->nr = q->alloc = 0;
2816
2817 return result;
2818 }
2819
2820 static int is_summary_empty(const struct diff_queue_struct *q)
2821 {
2822 int i;
2823
2824 for (i = 0; i < q->nr; i++) {
2825 const struct diff_filepair *p = q->queue[i];
2826
2827 switch (p->status) {
2828 case DIFF_STATUS_DELETED:
2829 case DIFF_STATUS_ADDED:
2830 case DIFF_STATUS_COPIED:
2831 case DIFF_STATUS_RENAMED:
2832 return 0;
2833 default:
2834 if (p->score)
2835 return 0;
2836 if (p->one->mode && p->two->mode &&
2837 p->one->mode != p->two->mode)
2838 return 0;
2839 break;
2840 }
2841 }
2842 return 1;
2843 }
2844
2845 void diff_flush(struct diff_options *options)
2846 {
2847 struct diff_queue_struct *q = &diff_queued_diff;
2848 int i, output_format = options->output_format;
2849 int separator = 0;
2850
2851 /*
2852 * Order: raw, stat, summary, patch
2853 * or: name/name-status/checkdiff (other bits clear)
2854 */
2855 if (!q->nr)
2856 goto free_queue;
2857
2858 if (output_format & (DIFF_FORMAT_RAW |
2859 DIFF_FORMAT_NAME |
2860 DIFF_FORMAT_NAME_STATUS |
2861 DIFF_FORMAT_CHECKDIFF)) {
2862 for (i = 0; i < q->nr; i++) {
2863 struct diff_filepair *p = q->queue[i];
2864 if (check_pair_status(p))
2865 flush_one_pair(p, options);
2866 }
2867 separator++;
2868 }
2869
2870 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2871 struct diffstat_t diffstat;
2872
2873 memset(&diffstat, 0, sizeof(struct diffstat_t));
2874 diffstat.xm.consume = diffstat_consume;
2875 for (i = 0; i < q->nr; i++) {
2876 struct diff_filepair *p = q->queue[i];
2877 if (check_pair_status(p))
2878 diff_flush_stat(p, options, &diffstat);
2879 }
2880 if (output_format & DIFF_FORMAT_NUMSTAT)
2881 show_numstat(&diffstat, options);
2882 if (output_format & DIFF_FORMAT_DIFFSTAT)
2883 show_stats(&diffstat, options);
2884 else if (output_format & DIFF_FORMAT_SHORTSTAT)
2885 show_shortstats(&diffstat);
2886 separator++;
2887 }
2888
2889 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2890 for (i = 0; i < q->nr; i++)
2891 diff_summary(q->queue[i]);
2892 separator++;
2893 }
2894
2895 if (output_format & DIFF_FORMAT_PATCH) {
2896 if (separator) {
2897 if (options->stat_sep) {
2898 /* attach patch instead of inline */
2899 fputs(options->stat_sep, stdout);
2900 } else {
2901 putchar(options->line_termination);
2902 }
2903 }
2904
2905 for (i = 0; i < q->nr; i++) {
2906 struct diff_filepair *p = q->queue[i];
2907 if (check_pair_status(p))
2908 diff_flush_patch(p, options);
2909 }
2910 }
2911
2912 if (output_format & DIFF_FORMAT_CALLBACK)
2913 options->format_callback(q, options, options->format_callback_data);
2914
2915 for (i = 0; i < q->nr; i++)
2916 diff_free_filepair(q->queue[i]);
2917 free_queue:
2918 free(q->queue);
2919 q->queue = NULL;
2920 q->nr = q->alloc = 0;
2921 }
2922
2923 static void diffcore_apply_filter(const char *filter)
2924 {
2925 int i;
2926 struct diff_queue_struct *q = &diff_queued_diff;
2927 struct diff_queue_struct outq;
2928 outq.queue = NULL;
2929 outq.nr = outq.alloc = 0;
2930
2931 if (!filter)
2932 return;
2933
2934 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2935 int found;
2936 for (i = found = 0; !found && i < q->nr; i++) {
2937 struct diff_filepair *p = q->queue[i];
2938 if (((p->status == DIFF_STATUS_MODIFIED) &&
2939 ((p->score &&
2940 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2941 (!p->score &&
2942 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2943 ((p->status != DIFF_STATUS_MODIFIED) &&
2944 strchr(filter, p->status)))
2945 found++;
2946 }
2947 if (found)
2948 return;
2949
2950 /* otherwise we will clear the whole queue
2951 * by copying the empty outq at the end of this
2952 * function, but first clear the current entries
2953 * in the queue.
2954 */
2955 for (i = 0; i < q->nr; i++)
2956 diff_free_filepair(q->queue[i]);
2957 }
2958 else {
2959 /* Only the matching ones */
2960 for (i = 0; i < q->nr; i++) {
2961 struct diff_filepair *p = q->queue[i];
2962
2963 if (((p->status == DIFF_STATUS_MODIFIED) &&
2964 ((p->score &&
2965 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2966 (!p->score &&
2967 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2968 ((p->status != DIFF_STATUS_MODIFIED) &&
2969 strchr(filter, p->status)))
2970 diff_q(&outq, p);
2971 else
2972 diff_free_filepair(p);
2973 }
2974 }
2975 free(q->queue);
2976 *q = outq;
2977 }
2978
2979 void diffcore_std(struct diff_options *options)
2980 {
2981 if (options->quiet)
2982 return;
2983 if (options->break_opt != -1)
2984 diffcore_break(options->break_opt);
2985 if (options->detect_rename)
2986 diffcore_rename(options);
2987 if (options->break_opt != -1)
2988 diffcore_merge_broken();
2989 if (options->pickaxe)
2990 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2991 if (options->orderfile)
2992 diffcore_order(options->orderfile);
2993 diff_resolve_rename_copy();
2994 diffcore_apply_filter(options->filter);
2995
2996 options->has_changes = !!diff_queued_diff.nr;
2997 }
2998
2999
3000 void diff_addremove(struct diff_options *options,
3001 int addremove, unsigned mode,
3002 const unsigned char *sha1,
3003 const char *base, const char *path)
3004 {
3005 char concatpath[PATH_MAX];
3006 struct diff_filespec *one, *two;
3007
3008 /* This may look odd, but it is a preparation for
3009 * feeding "there are unchanged files which should
3010 * not produce diffs, but when you are doing copy
3011 * detection you would need them, so here they are"
3012 * entries to the diff-core. They will be prefixed
3013 * with something like '=' or '*' (I haven't decided
3014 * which but should not make any difference).
3015 * Feeding the same new and old to diff_change()
3016 * also has the same effect.
3017 * Before the final output happens, they are pruned after
3018 * merged into rename/copy pairs as appropriate.
3019 */
3020 if (options->reverse_diff)
3021 addremove = (addremove == '+' ? '-' :
3022 addremove == '-' ? '+' : addremove);
3023
3024 if (!path) path = "";
3025 sprintf(concatpath, "%s%s", base, path);
3026 one = alloc_filespec(concatpath);
3027 two = alloc_filespec(concatpath);
3028
3029 if (addremove != '+')
3030 fill_filespec(one, sha1, mode);
3031 if (addremove != '-')
3032 fill_filespec(two, sha1, mode);
3033
3034 diff_queue(&diff_queued_diff, one, two);
3035 options->has_changes = 1;
3036 }
3037
3038 void diff_change(struct diff_options *options,
3039 unsigned old_mode, unsigned new_mode,
3040 const unsigned char *old_sha1,
3041 const unsigned char *new_sha1,
3042 const char *base, const char *path)
3043 {
3044 char concatpath[PATH_MAX];
3045 struct diff_filespec *one, *two;
3046
3047 if (options->reverse_diff) {
3048 unsigned tmp;
3049 const unsigned char *tmp_c;
3050 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3051 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3052 }
3053 if (!path) path = "";
3054 sprintf(concatpath, "%s%s", base, path);
3055 one = alloc_filespec(concatpath);
3056 two = alloc_filespec(concatpath);
3057 fill_filespec(one, old_sha1, old_mode);
3058 fill_filespec(two, new_sha1, new_mode);
3059
3060 diff_queue(&diff_queued_diff, one, two);
3061 options->has_changes = 1;
3062 }
3063
3064 void diff_unmerge(struct diff_options *options,
3065 const char *path,
3066 unsigned mode, const unsigned char *sha1)
3067 {
3068 struct diff_filespec *one, *two;
3069 one = alloc_filespec(path);
3070 two = alloc_filespec(path);
3071 fill_filespec(one, sha1, mode);
3072 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3073 }