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