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