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Make trivial wrapper functions around delta base generation and freeing
[git/builtin-gsoc.git] / diff.c
blob954ca83e0b0c95f55c0287d2deeb4cab76153fe0
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11
12 #ifdef NO_FAST_WORKING_DIRECTORY
13 #define FAST_WORKING_DIRECTORY 0
14 #else
15 #define FAST_WORKING_DIRECTORY 1
16 #endif
17
18 static int use_size_cache;
19
20 static int diff_detect_rename_default;
21 static int diff_rename_limit_default = -1;
22 static int diff_use_color_default;
23
24 static char diff_colors[][COLOR_MAXLEN] = {
25 "\033[m", /* reset */
26 "", /* PLAIN (normal) */
27 "\033[1m", /* METAINFO (bold) */
28 "\033[36m", /* FRAGINFO (cyan) */
29 "\033[31m", /* OLD (red) */
30 "\033[32m", /* NEW (green) */
31 "\033[33m", /* COMMIT (yellow) */
32 "\033[41m", /* WHITESPACE (red background) */
33 };
34
35 static int parse_diff_color_slot(const char *var, int ofs)
36 {
37 if (!strcasecmp(var+ofs, "plain"))
38 return DIFF_PLAIN;
39 if (!strcasecmp(var+ofs, "meta"))
40 return DIFF_METAINFO;
41 if (!strcasecmp(var+ofs, "frag"))
42 return DIFF_FRAGINFO;
43 if (!strcasecmp(var+ofs, "old"))
44 return DIFF_FILE_OLD;
45 if (!strcasecmp(var+ofs, "new"))
46 return DIFF_FILE_NEW;
47 if (!strcasecmp(var+ofs, "commit"))
48 return DIFF_COMMIT;
49 if (!strcasecmp(var+ofs, "whitespace"))
50 return DIFF_WHITESPACE;
51 die("bad config variable '%s'", var);
52 }
53
54 /*
55 * These are to give UI layer defaults.
56 * The core-level commands such as git-diff-files should
57 * never be affected by the setting of diff.renames
58 * the user happens to have in the configuration file.
59 */
60 int git_diff_ui_config(const char *var, const char *value)
61 {
62 if (!strcmp(var, "diff.renamelimit")) {
63 diff_rename_limit_default = git_config_int(var, value);
64 return 0;
65 }
66 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
67 diff_use_color_default = git_config_colorbool(var, value);
68 return 0;
69 }
70 if (!strcmp(var, "diff.renames")) {
71 if (!value)
72 diff_detect_rename_default = DIFF_DETECT_RENAME;
73 else if (!strcasecmp(value, "copies") ||
74 !strcasecmp(value, "copy"))
75 diff_detect_rename_default = DIFF_DETECT_COPY;
76 else if (git_config_bool(var,value))
77 diff_detect_rename_default = DIFF_DETECT_RENAME;
78 return 0;
79 }
80 if (!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 }
87
88 static char *quote_one(const char *str)
89 {
90 int needlen;
91 char *xp;
92
93 if (!str)
94 return NULL;
95 needlen = quote_c_style(str, NULL, NULL, 0);
96 if (!needlen)
97 return xstrdup(str);
98 xp = xmalloc(needlen + 1);
99 quote_c_style(str, xp, NULL, 0);
100 return xp;
101 }
102
103 static char *quote_two(const char *one, const char *two)
104 {
105 int need_one = quote_c_style(one, NULL, NULL, 1);
106 int need_two = quote_c_style(two, NULL, NULL, 1);
107 char *xp;
108
109 if (need_one + need_two) {
110 if (!need_one) need_one = strlen(one);
111 if (!need_two) need_one = strlen(two);
112
113 xp = xmalloc(need_one + need_two + 3);
114 xp[0] = '"';
115 quote_c_style(one, xp + 1, NULL, 1);
116 quote_c_style(two, xp + need_one + 1, NULL, 1);
117 strcpy(xp + need_one + need_two + 1, "\"");
118 return xp;
119 }
120 need_one = strlen(one);
121 need_two = strlen(two);
122 xp = xmalloc(need_one + need_two + 1);
123 strcpy(xp, one);
124 strcpy(xp + need_one, two);
125 return xp;
126 }
127
128 static const char *external_diff(void)
129 {
130 static const char *external_diff_cmd = NULL;
131 static int done_preparing = 0;
132
133 if (done_preparing)
134 return external_diff_cmd;
135 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
136 done_preparing = 1;
137 return external_diff_cmd;
138 }
139
140 #define TEMPFILE_PATH_LEN 50
141
142 static struct diff_tempfile {
143 const char *name; /* filename external diff should read from */
144 char hex[41];
145 char mode[10];
146 char tmp_path[TEMPFILE_PATH_LEN];
147 } diff_temp[2];
148
149 static int count_lines(const char *data, int size)
150 {
151 int count, ch, completely_empty = 1, nl_just_seen = 0;
152 count = 0;
153 while (0 < size--) {
154 ch = *data++;
155 if (ch == '\n') {
156 count++;
157 nl_just_seen = 1;
158 completely_empty = 0;
159 }
160 else {
161 nl_just_seen = 0;
162 completely_empty = 0;
163 }
164 }
165 if (completely_empty)
166 return 0;
167 if (!nl_just_seen)
168 count++; /* no trailing newline */
169 return count;
170 }
171
172 static void print_line_count(int count)
173 {
174 switch (count) {
175 case 0:
176 printf("0,0");
177 break;
178 case 1:
179 printf("1");
180 break;
181 default:
182 printf("1,%d", count);
183 break;
184 }
185 }
186
187 static void copy_file(int prefix, const char *data, int size,
188 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 }
207
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);
221
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" : "";
226
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 }
243
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 }
257
258 struct diff_words_buffer {
259 mmfile_t text;
260 long alloc;
261 long current; /* output pointer */
262 int suppressed_newline;
263 };
264
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 }
277
278 struct diff_words_data {
279 struct xdiff_emit_state xm;
280 struct diff_words_buffer minus, plus;
281 };
282
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;
288
289 if (len == 0)
290 return;
291
292 ptr = buffer->text.ptr + buffer->current;
293 buffer->current += len;
294
295 if (ptr[len - 1] == '\n') {
296 eol = 1;
297 len--;
298 }
299
300 fputs(diff_get_color(1, color), stdout);
301 fwrite(ptr, len, 1, stdout);
302 fputs(diff_get_color(1, DIFF_RESET), stdout);
303
304 if (eol) {
305 if (suppress_newline)
306 buffer->suppressed_newline = 1;
307 else
308 putchar('\n');
309 }
310 }
311
312 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
313 {
314 struct diff_words_data *diff_words = priv;
315
316 if (diff_words->minus.suppressed_newline) {
317 if (line[0] != '+')
318 putchar('\n');
319 diff_words->minus.suppressed_newline = 0;
320 }
321
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 }
336
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;
345
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;
353
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;
361
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);
369
370 free(minus.ptr);
371 free(plus.ptr);
372 diff_words->minus.text.size = diff_words->plus.text.size = 0;
373
374 if (diff_words->minus.suppressed_newline) {
375 putchar('\n');
376 diff_words->minus.suppressed_newline = 0;
377 }
378 }
379
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 int *found_changesp;
386 };
387
388 static void free_diff_words_data(struct emit_callback *ecbdata)
389 {
390 if (ecbdata->diff_words) {
391 /* flush buffers */
392 if (ecbdata->diff_words->minus.text.size ||
393 ecbdata->diff_words->plus.text.size)
394 diff_words_show(ecbdata->diff_words);
395
396 if (ecbdata->diff_words->minus.text.ptr)
397 free (ecbdata->diff_words->minus.text.ptr);
398 if (ecbdata->diff_words->plus.text.ptr)
399 free (ecbdata->diff_words->plus.text.ptr);
400 free(ecbdata->diff_words);
401 ecbdata->diff_words = NULL;
402 }
403 }
404
405 const char *diff_get_color(int diff_use_color, enum color_diff ix)
406 {
407 if (diff_use_color)
408 return diff_colors[ix];
409 return "";
410 }
411
412 static void emit_line(const char *set, const char *reset, const char *line, int len)
413 {
414 if (len > 0 && line[len-1] == '\n')
415 len--;
416 fputs(set, stdout);
417 fwrite(line, len, 1, stdout);
418 puts(reset);
419 }
420
421 static void emit_line_with_ws(int nparents,
422 const char *set, const char *reset, const char *ws,
423 const char *line, int len)
424 {
425 int col0 = nparents;
426 int last_tab_in_indent = -1;
427 int last_space_in_indent = -1;
428 int i;
429 int tail = len;
430 int need_highlight_leading_space = 0;
431 /* The line is a newly added line. Does it have funny leading
432 * whitespaces? In indent, SP should never precede a TAB.
433 */
434 for (i = col0; i < len; i++) {
435 if (line[i] == '\t') {
436 last_tab_in_indent = i;
437 if (0 <= last_space_in_indent)
438 need_highlight_leading_space = 1;
439 }
440 else if (line[i] == ' ')
441 last_space_in_indent = i;
442 else
443 break;
444 }
445 fputs(set, stdout);
446 fwrite(line, col0, 1, stdout);
447 fputs(reset, stdout);
448 if (((i == len) || line[i] == '\n') && i != col0) {
449 /* The whole line was indent */
450 emit_line(ws, reset, line + col0, len - col0);
451 return;
452 }
453 i = col0;
454 if (need_highlight_leading_space) {
455 while (i < last_tab_in_indent) {
456 if (line[i] == ' ') {
457 fputs(ws, stdout);
458 putchar(' ');
459 fputs(reset, stdout);
460 }
461 else
462 putchar(line[i]);
463 i++;
464 }
465 }
466 tail = len - 1;
467 if (line[tail] == '\n' && i < tail)
468 tail--;
469 while (i < tail) {
470 if (!isspace(line[tail]))
471 break;
472 tail--;
473 }
474 if ((i < tail && line[tail + 1] != '\n')) {
475 /* This has whitespace between tail+1..len */
476 fputs(set, stdout);
477 fwrite(line + i, tail - i + 1, 1, stdout);
478 fputs(reset, stdout);
479 emit_line(ws, reset, line + tail + 1, len - tail - 1);
480 }
481 else
482 emit_line(set, reset, line + i, len - i);
483 }
484
485 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
486 {
487 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
488 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
489
490 if (!*ws)
491 emit_line(set, reset, line, len);
492 else
493 emit_line_with_ws(ecbdata->nparents, set, reset, ws,
494 line, len);
495 }
496
497 static void fn_out_consume(void *priv, char *line, unsigned long len)
498 {
499 int i;
500 int color;
501 struct emit_callback *ecbdata = priv;
502 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
503 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
504
505 *(ecbdata->found_changesp) = 1;
506
507 if (ecbdata->label_path[0]) {
508 const char *name_a_tab, *name_b_tab;
509
510 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
511 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
512
513 printf("%s--- %s%s%s\n",
514 set, ecbdata->label_path[0], reset, name_a_tab);
515 printf("%s+++ %s%s%s\n",
516 set, ecbdata->label_path[1], reset, name_b_tab);
517 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
518 }
519
520 /* This is not really necessary for now because
521 * this codepath only deals with two-way diffs.
522 */
523 for (i = 0; i < len && line[i] == '@'; i++)
524 ;
525 if (2 <= i && i < len && line[i] == ' ') {
526 ecbdata->nparents = i - 1;
527 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
528 reset, line, len);
529 return;
530 }
531
532 if (len < ecbdata->nparents) {
533 set = reset;
534 emit_line(reset, reset, line, len);
535 return;
536 }
537
538 color = DIFF_PLAIN;
539 if (ecbdata->diff_words && ecbdata->nparents != 1)
540 /* fall back to normal diff */
541 free_diff_words_data(ecbdata);
542 if (ecbdata->diff_words) {
543 if (line[0] == '-') {
544 diff_words_append(line, len,
545 &ecbdata->diff_words->minus);
546 return;
547 } else if (line[0] == '+') {
548 diff_words_append(line, len,
549 &ecbdata->diff_words->plus);
550 return;
551 }
552 if (ecbdata->diff_words->minus.text.size ||
553 ecbdata->diff_words->plus.text.size)
554 diff_words_show(ecbdata->diff_words);
555 line++;
556 len--;
557 emit_line(set, reset, line, len);
558 return;
559 }
560 for (i = 0; i < ecbdata->nparents && len; i++) {
561 if (line[i] == '-')
562 color = DIFF_FILE_OLD;
563 else if (line[i] == '+')
564 color = DIFF_FILE_NEW;
565 }
566
567 if (color != DIFF_FILE_NEW) {
568 emit_line(diff_get_color(ecbdata->color_diff, color),
569 reset, line, len);
570 return;
571 }
572 emit_add_line(reset, ecbdata, line, len);
573 }
574
575 static char *pprint_rename(const char *a, const char *b)
576 {
577 const char *old = a;
578 const char *new = b;
579 char *name = NULL;
580 int pfx_length, sfx_length;
581 int len_a = strlen(a);
582 int len_b = strlen(b);
583 int qlen_a = quote_c_style(a, NULL, NULL, 0);
584 int qlen_b = quote_c_style(b, NULL, NULL, 0);
585
586 if (qlen_a || qlen_b) {
587 if (qlen_a) len_a = qlen_a;
588 if (qlen_b) len_b = qlen_b;
589 name = xmalloc( len_a + len_b + 5 );
590 if (qlen_a)
591 quote_c_style(a, name, NULL, 0);
592 else
593 memcpy(name, a, len_a);
594 memcpy(name + len_a, " => ", 4);
595 if (qlen_b)
596 quote_c_style(b, name + len_a + 4, NULL, 0);
597 else
598 memcpy(name + len_a + 4, b, len_b + 1);
599 return name;
600 }
601
602 /* Find common prefix */
603 pfx_length = 0;
604 while (*old && *new && *old == *new) {
605 if (*old == '/')
606 pfx_length = old - a + 1;
607 old++;
608 new++;
609 }
610
611 /* Find common suffix */
612 old = a + len_a;
613 new = b + len_b;
614 sfx_length = 0;
615 while (a <= old && b <= new && *old == *new) {
616 if (*old == '/')
617 sfx_length = len_a - (old - a);
618 old--;
619 new--;
620 }
621
622 /*
623 * pfx{mid-a => mid-b}sfx
624 * {pfx-a => pfx-b}sfx
625 * pfx{sfx-a => sfx-b}
626 * name-a => name-b
627 */
628 if (pfx_length + sfx_length) {
629 int a_midlen = len_a - pfx_length - sfx_length;
630 int b_midlen = len_b - pfx_length - sfx_length;
631 if (a_midlen < 0) a_midlen = 0;
632 if (b_midlen < 0) b_midlen = 0;
633
634 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
635 sprintf(name, "%.*s{%.*s => %.*s}%s",
636 pfx_length, a,
637 a_midlen, a + pfx_length,
638 b_midlen, b + pfx_length,
639 a + len_a - sfx_length);
640 }
641 else {
642 name = xmalloc(len_a + len_b + 5);
643 sprintf(name, "%s => %s", a, b);
644 }
645 return name;
646 }
647
648 struct diffstat_t {
649 struct xdiff_emit_state xm;
650
651 int nr;
652 int alloc;
653 struct diffstat_file {
654 char *name;
655 unsigned is_unmerged:1;
656 unsigned is_binary:1;
657 unsigned is_renamed:1;
658 unsigned int added, deleted;
659 } **files;
660 };
661
662 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
663 const char *name_a,
664 const char *name_b)
665 {
666 struct diffstat_file *x;
667 x = xcalloc(sizeof (*x), 1);
668 if (diffstat->nr == diffstat->alloc) {
669 diffstat->alloc = alloc_nr(diffstat->alloc);
670 diffstat->files = xrealloc(diffstat->files,
671 diffstat->alloc * sizeof(x));
672 }
673 diffstat->files[diffstat->nr++] = x;
674 if (name_b) {
675 x->name = pprint_rename(name_a, name_b);
676 x->is_renamed = 1;
677 }
678 else
679 x->name = xstrdup(name_a);
680 return x;
681 }
682
683 static void diffstat_consume(void *priv, char *line, unsigned long len)
684 {
685 struct diffstat_t *diffstat = priv;
686 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
687
688 if (line[0] == '+')
689 x->added++;
690 else if (line[0] == '-')
691 x->deleted++;
692 }
693
694 const char mime_boundary_leader[] = "------------";
695
696 static int scale_linear(int it, int width, int max_change)
697 {
698 /*
699 * make sure that at least one '-' is printed if there were deletions,
700 * and likewise for '+'.
701 */
702 if (max_change < 2)
703 return it;
704 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
705 }
706
707 static void show_name(const char *prefix, const char *name, int len,
708 const char *reset, const char *set)
709 {
710 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
711 }
712
713 static void show_graph(char ch, int cnt, const char *set, const char *reset)
714 {
715 if (cnt <= 0)
716 return;
717 printf("%s", set);
718 while (cnt--)
719 putchar(ch);
720 printf("%s", reset);
721 }
722
723 static void show_stats(struct diffstat_t* data, struct diff_options *options)
724 {
725 int i, len, add, del, total, adds = 0, dels = 0;
726 int max_change = 0, max_len = 0;
727 int total_files = data->nr;
728 int width, name_width;
729 const char *reset, *set, *add_c, *del_c;
730
731 if (data->nr == 0)
732 return;
733
734 width = options->stat_width ? options->stat_width : 80;
735 name_width = options->stat_name_width ? options->stat_name_width : 50;
736
737 /* Sanity: give at least 5 columns to the graph,
738 * but leave at least 10 columns for the name.
739 */
740 if (width < name_width + 15) {
741 if (name_width <= 25)
742 width = name_width + 15;
743 else
744 name_width = width - 15;
745 }
746
747 /* Find the longest filename and max number of changes */
748 reset = diff_get_color(options->color_diff, DIFF_RESET);
749 set = diff_get_color(options->color_diff, DIFF_PLAIN);
750 add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
751 del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
752
753 for (i = 0; i < data->nr; i++) {
754 struct diffstat_file *file = data->files[i];
755 int change = file->added + file->deleted;
756
757 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
758 len = quote_c_style(file->name, NULL, NULL, 0);
759 if (len) {
760 char *qname = xmalloc(len + 1);
761 quote_c_style(file->name, qname, NULL, 0);
762 free(file->name);
763 file->name = qname;
764 }
765 }
766
767 len = strlen(file->name);
768 if (max_len < len)
769 max_len = len;
770
771 if (file->is_binary || file->is_unmerged)
772 continue;
773 if (max_change < change)
774 max_change = change;
775 }
776
777 /* Compute the width of the graph part;
778 * 10 is for one blank at the beginning of the line plus
779 * " | count " between the name and the graph.
780 *
781 * From here on, name_width is the width of the name area,
782 * and width is the width of the graph area.
783 */
784 name_width = (name_width < max_len) ? name_width : max_len;
785 if (width < (name_width + 10) + max_change)
786 width = width - (name_width + 10);
787 else
788 width = max_change;
789
790 for (i = 0; i < data->nr; i++) {
791 const char *prefix = "";
792 char *name = data->files[i]->name;
793 int added = data->files[i]->added;
794 int deleted = data->files[i]->deleted;
795 int name_len;
796
797 /*
798 * "scale" the filename
799 */
800 len = name_width;
801 name_len = strlen(name);
802 if (name_width < name_len) {
803 char *slash;
804 prefix = "...";
805 len -= 3;
806 name += name_len - len;
807 slash = strchr(name, '/');
808 if (slash)
809 name = slash;
810 }
811
812 if (data->files[i]->is_binary) {
813 show_name(prefix, name, len, reset, set);
814 printf(" Bin\n");
815 goto free_diffstat_file;
816 }
817 else if (data->files[i]->is_unmerged) {
818 show_name(prefix, name, len, reset, set);
819 printf(" Unmerged\n");
820 goto free_diffstat_file;
821 }
822 else if (!data->files[i]->is_renamed &&
823 (added + deleted == 0)) {
824 total_files--;
825 goto free_diffstat_file;
826 }
827
828 /*
829 * scale the add/delete
830 */
831 add = added;
832 del = deleted;
833 total = add + del;
834 adds += add;
835 dels += del;
836
837 if (width <= max_change) {
838 add = scale_linear(add, width, max_change);
839 del = scale_linear(del, width, max_change);
840 total = add + del;
841 }
842 show_name(prefix, name, len, reset, set);
843 printf("%5d ", added + deleted);
844 show_graph('+', add, add_c, reset);
845 show_graph('-', del, del_c, reset);
846 putchar('\n');
847 free_diffstat_file:
848 free(data->files[i]->name);
849 free(data->files[i]);
850 }
851 free(data->files);
852 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
853 set, total_files, adds, dels, reset);
854 }
855
856 static void show_shortstats(struct diffstat_t* data)
857 {
858 int i, adds = 0, dels = 0, total_files = data->nr;
859
860 if (data->nr == 0)
861 return;
862
863 for (i = 0; i < data->nr; i++) {
864 if (!data->files[i]->is_binary &&
865 !data->files[i]->is_unmerged) {
866 int added = data->files[i]->added;
867 int deleted= data->files[i]->deleted;
868 if (!data->files[i]->is_renamed &&
869 (added + deleted == 0)) {
870 total_files--;
871 } else {
872 adds += added;
873 dels += deleted;
874 }
875 }
876 free(data->files[i]->name);
877 free(data->files[i]);
878 }
879 free(data->files);
880
881 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
882 total_files, adds, dels);
883 }
884
885 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
886 {
887 int i;
888
889 for (i = 0; i < data->nr; i++) {
890 struct diffstat_file *file = data->files[i];
891
892 if (file->is_binary)
893 printf("-\t-\t");
894 else
895 printf("%d\t%d\t", file->added, file->deleted);
896 if (options->line_termination && !file->is_renamed &&
897 quote_c_style(file->name, NULL, NULL, 0))
898 quote_c_style(file->name, NULL, stdout, 0);
899 else
900 fputs(file->name, stdout);
901 putchar(options->line_termination);
902 }
903 }
904
905 struct checkdiff_t {
906 struct xdiff_emit_state xm;
907 const char *filename;
908 int lineno, color_diff;
909 };
910
911 static void checkdiff_consume(void *priv, char *line, unsigned long len)
912 {
913 struct checkdiff_t *data = priv;
914 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
915 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
916 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
917
918 if (line[0] == '+') {
919 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
920
921 /* check space before tab */
922 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
923 if (line[i] == ' ')
924 spaces++;
925 if (line[i - 1] == '\t' && spaces)
926 space_before_tab = 1;
927
928 /* check white space at line end */
929 if (line[len - 1] == '\n')
930 len--;
931 if (isspace(line[len - 1]))
932 white_space_at_end = 1;
933
934 if (space_before_tab || white_space_at_end) {
935 printf("%s:%d: %s", data->filename, data->lineno, ws);
936 if (space_before_tab) {
937 printf("space before tab");
938 if (white_space_at_end)
939 putchar(',');
940 }
941 if (white_space_at_end)
942 printf("white space at end");
943 printf(":%s ", reset);
944 emit_line_with_ws(1, set, reset, ws, line, len);
945 }
946
947 data->lineno++;
948 } else if (line[0] == ' ')
949 data->lineno++;
950 else if (line[0] == '@') {
951 char *plus = strchr(line, '+');
952 if (plus)
953 data->lineno = strtol(plus, NULL, 10);
954 else
955 die("invalid diff");
956 }
957 }
958
959 static unsigned char *deflate_it(char *data,
960 unsigned long size,
961 unsigned long *result_size)
962 {
963 int bound;
964 unsigned char *deflated;
965 z_stream stream;
966
967 memset(&stream, 0, sizeof(stream));
968 deflateInit(&stream, zlib_compression_level);
969 bound = deflateBound(&stream, size);
970 deflated = xmalloc(bound);
971 stream.next_out = deflated;
972 stream.avail_out = bound;
973
974 stream.next_in = (unsigned char *)data;
975 stream.avail_in = size;
976 while (deflate(&stream, Z_FINISH) == Z_OK)
977 ; /* nothing */
978 deflateEnd(&stream);
979 *result_size = stream.total_out;
980 return deflated;
981 }
982
983 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
984 {
985 void *cp;
986 void *delta;
987 void *deflated;
988 void *data;
989 unsigned long orig_size;
990 unsigned long delta_size;
991 unsigned long deflate_size;
992 unsigned long data_size;
993
994 /* We could do deflated delta, or we could do just deflated two,
995 * whichever is smaller.
996 */
997 delta = NULL;
998 deflated = deflate_it(two->ptr, two->size, &deflate_size);
999 if (one->size && two->size) {
1000 delta = diff_delta(one->ptr, one->size,
1001 two->ptr, two->size,
1002 &delta_size, deflate_size);
1003 if (delta) {
1004 void *to_free = delta;
1005 orig_size = delta_size;
1006 delta = deflate_it(delta, delta_size, &delta_size);
1007 free(to_free);
1008 }
1009 }
1010
1011 if (delta && delta_size < deflate_size) {
1012 printf("delta %lu\n", orig_size);
1013 free(deflated);
1014 data = delta;
1015 data_size = delta_size;
1016 }
1017 else {
1018 printf("literal %lu\n", two->size);
1019 free(delta);
1020 data = deflated;
1021 data_size = deflate_size;
1022 }
1023
1024 /* emit data encoded in base85 */
1025 cp = data;
1026 while (data_size) {
1027 int bytes = (52 < data_size) ? 52 : data_size;
1028 char line[70];
1029 data_size -= bytes;
1030 if (bytes <= 26)
1031 line[0] = bytes + 'A' - 1;
1032 else
1033 line[0] = bytes - 26 + 'a' - 1;
1034 encode_85(line + 1, cp, bytes);
1035 cp = (char *) cp + bytes;
1036 puts(line);
1037 }
1038 printf("\n");
1039 free(data);
1040 }
1041
1042 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1043 {
1044 printf("GIT binary patch\n");
1045 emit_binary_diff_body(one, two);
1046 emit_binary_diff_body(two, one);
1047 }
1048
1049 #define FIRST_FEW_BYTES 8000
1050 static int mmfile_is_binary(mmfile_t *mf)
1051 {
1052 long sz = mf->size;
1053 if (FIRST_FEW_BYTES < sz)
1054 sz = FIRST_FEW_BYTES;
1055 return !!memchr(mf->ptr, 0, sz);
1056 }
1057
1058 static void builtin_diff(const char *name_a,
1059 const char *name_b,
1060 struct diff_filespec *one,
1061 struct diff_filespec *two,
1062 const char *xfrm_msg,
1063 struct diff_options *o,
1064 int complete_rewrite)
1065 {
1066 mmfile_t mf1, mf2;
1067 const char *lbl[2];
1068 char *a_one, *b_two;
1069 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1070 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
1071
1072 a_one = quote_two("a/", name_a + (*name_a == '/'));
1073 b_two = quote_two("b/", name_b + (*name_b == '/'));
1074 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1075 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1076 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1077 if (lbl[0][0] == '/') {
1078 /* /dev/null */
1079 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1080 if (xfrm_msg && xfrm_msg[0])
1081 printf("%s%s%s\n", set, xfrm_msg, reset);
1082 }
1083 else if (lbl[1][0] == '/') {
1084 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1085 if (xfrm_msg && xfrm_msg[0])
1086 printf("%s%s%s\n", set, xfrm_msg, reset);
1087 }
1088 else {
1089 if (one->mode != two->mode) {
1090 printf("%sold mode %06o%s\n", set, one->mode, reset);
1091 printf("%snew mode %06o%s\n", set, two->mode, reset);
1092 }
1093 if (xfrm_msg && xfrm_msg[0])
1094 printf("%s%s%s\n", set, xfrm_msg, reset);
1095 /*
1096 * we do not run diff between different kind
1097 * of objects.
1098 */
1099 if ((one->mode ^ two->mode) & S_IFMT)
1100 goto free_ab_and_return;
1101 if (complete_rewrite) {
1102 emit_rewrite_diff(name_a, name_b, one, two,
1103 o->color_diff);
1104 o->found_changes = 1;
1105 goto free_ab_and_return;
1106 }
1107 }
1108
1109 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1110 die("unable to read files to diff");
1111
1112 if (!o->text && (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))) {
1113 /* Quite common confusing case */
1114 if (mf1.size == mf2.size &&
1115 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1116 goto free_ab_and_return;
1117 if (o->binary)
1118 emit_binary_diff(&mf1, &mf2);
1119 else
1120 printf("Binary files %s and %s differ\n",
1121 lbl[0], lbl[1]);
1122 o->found_changes = 1;
1123 }
1124 else {
1125 /* Crazy xdl interfaces.. */
1126 const char *diffopts = getenv("GIT_DIFF_OPTS");
1127 xpparam_t xpp;
1128 xdemitconf_t xecfg;
1129 xdemitcb_t ecb;
1130 struct emit_callback ecbdata;
1131
1132 memset(&ecbdata, 0, sizeof(ecbdata));
1133 ecbdata.label_path = lbl;
1134 ecbdata.color_diff = o->color_diff;
1135 ecbdata.found_changesp = &o->found_changes;
1136 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1137 xecfg.ctxlen = o->context;
1138 xecfg.flags = XDL_EMIT_FUNCNAMES;
1139 if (!diffopts)
1140 ;
1141 else if (!prefixcmp(diffopts, "--unified="))
1142 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1143 else if (!prefixcmp(diffopts, "-u"))
1144 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1145 ecb.outf = xdiff_outf;
1146 ecb.priv = &ecbdata;
1147 ecbdata.xm.consume = fn_out_consume;
1148 if (o->color_diff_words)
1149 ecbdata.diff_words =
1150 xcalloc(1, sizeof(struct diff_words_data));
1151 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1152 if (o->color_diff_words)
1153 free_diff_words_data(&ecbdata);
1154 }
1155
1156 free_ab_and_return:
1157 free(a_one);
1158 free(b_two);
1159 return;
1160 }
1161
1162 static void builtin_diffstat(const char *name_a, const char *name_b,
1163 struct diff_filespec *one,
1164 struct diff_filespec *two,
1165 struct diffstat_t *diffstat,
1166 struct diff_options *o,
1167 int complete_rewrite)
1168 {
1169 mmfile_t mf1, mf2;
1170 struct diffstat_file *data;
1171
1172 data = diffstat_add(diffstat, name_a, name_b);
1173
1174 if (!one || !two) {
1175 data->is_unmerged = 1;
1176 return;
1177 }
1178 if (complete_rewrite) {
1179 diff_populate_filespec(one, 0);
1180 diff_populate_filespec(two, 0);
1181 data->deleted = count_lines(one->data, one->size);
1182 data->added = count_lines(two->data, two->size);
1183 return;
1184 }
1185 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1186 die("unable to read files to diff");
1187
1188 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
1189 data->is_binary = 1;
1190 else {
1191 /* Crazy xdl interfaces.. */
1192 xpparam_t xpp;
1193 xdemitconf_t xecfg;
1194 xdemitcb_t ecb;
1195
1196 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1197 xecfg.ctxlen = 0;
1198 xecfg.flags = 0;
1199 ecb.outf = xdiff_outf;
1200 ecb.priv = diffstat;
1201 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1202 }
1203 }
1204
1205 static void builtin_checkdiff(const char *name_a, const char *name_b,
1206 struct diff_filespec *one,
1207 struct diff_filespec *two, struct diff_options *o)
1208 {
1209 mmfile_t mf1, mf2;
1210 struct checkdiff_t data;
1211
1212 if (!two)
1213 return;
1214
1215 memset(&data, 0, sizeof(data));
1216 data.xm.consume = checkdiff_consume;
1217 data.filename = name_b ? name_b : name_a;
1218 data.lineno = 0;
1219 data.color_diff = o->color_diff;
1220
1221 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1222 die("unable to read files to diff");
1223
1224 if (mmfile_is_binary(&mf2))
1225 return;
1226 else {
1227 /* Crazy xdl interfaces.. */
1228 xpparam_t xpp;
1229 xdemitconf_t xecfg;
1230 xdemitcb_t ecb;
1231
1232 xpp.flags = XDF_NEED_MINIMAL;
1233 xecfg.ctxlen = 0;
1234 xecfg.flags = 0;
1235 ecb.outf = xdiff_outf;
1236 ecb.priv = &data;
1237 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1238 }
1239 }
1240
1241 struct diff_filespec *alloc_filespec(const char *path)
1242 {
1243 int namelen = strlen(path);
1244 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1245
1246 memset(spec, 0, sizeof(*spec));
1247 spec->path = (char *)(spec + 1);
1248 memcpy(spec->path, path, namelen+1);
1249 return spec;
1250 }
1251
1252 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1253 unsigned short mode)
1254 {
1255 if (mode) {
1256 spec->mode = canon_mode(mode);
1257 hashcpy(spec->sha1, sha1);
1258 spec->sha1_valid = !is_null_sha1(sha1);
1259 }
1260 }
1261
1262 /*
1263 * Given a name and sha1 pair, if the dircache tells us the file in
1264 * the work tree has that object contents, return true, so that
1265 * prepare_temp_file() does not have to inflate and extract.
1266 */
1267 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1268 {
1269 struct cache_entry *ce;
1270 struct stat st;
1271 int pos, len;
1272
1273 /* We do not read the cache ourselves here, because the
1274 * benchmark with my previous version that always reads cache
1275 * shows that it makes things worse for diff-tree comparing
1276 * two linux-2.6 kernel trees in an already checked out work
1277 * tree. This is because most diff-tree comparisons deal with
1278 * only a small number of files, while reading the cache is
1279 * expensive for a large project, and its cost outweighs the
1280 * savings we get by not inflating the object to a temporary
1281 * file. Practically, this code only helps when we are used
1282 * by diff-cache --cached, which does read the cache before
1283 * calling us.
1284 */
1285 if (!active_cache)
1286 return 0;
1287
1288 /* We want to avoid the working directory if our caller
1289 * doesn't need the data in a normal file, this system
1290 * is rather slow with its stat/open/mmap/close syscalls,
1291 * and the object is contained in a pack file. The pack
1292 * is probably already open and will be faster to obtain
1293 * the data through than the working directory. Loose
1294 * objects however would tend to be slower as they need
1295 * to be individually opened and inflated.
1296 */
1297 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1298 return 0;
1299
1300 len = strlen(name);
1301 pos = cache_name_pos(name, len);
1302 if (pos < 0)
1303 return 0;
1304 ce = active_cache[pos];
1305 if ((lstat(name, &st) < 0) ||
1306 !S_ISREG(st.st_mode) || /* careful! */
1307 ce_match_stat(ce, &st, 0) ||
1308 hashcmp(sha1, ce->sha1))
1309 return 0;
1310 /* we return 1 only when we can stat, it is a regular file,
1311 * stat information matches, and sha1 recorded in the cache
1312 * matches. I.e. we know the file in the work tree really is
1313 * the same as the <name, sha1> pair.
1314 */
1315 return 1;
1316 }
1317
1318 static struct sha1_size_cache {
1319 unsigned char sha1[20];
1320 unsigned long size;
1321 } **sha1_size_cache;
1322 static int sha1_size_cache_nr, sha1_size_cache_alloc;
1323
1324 static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
1325 int find_only,
1326 unsigned long size)
1327 {
1328 int first, last;
1329 struct sha1_size_cache *e;
1330
1331 first = 0;
1332 last = sha1_size_cache_nr;
1333 while (last > first) {
1334 int cmp, next = (last + first) >> 1;
1335 e = sha1_size_cache[next];
1336 cmp = hashcmp(e->sha1, sha1);
1337 if (!cmp)
1338 return e;
1339 if (cmp < 0) {
1340 last = next;
1341 continue;
1342 }
1343 first = next+1;
1344 }
1345 /* not found */
1346 if (find_only)
1347 return NULL;
1348 /* insert to make it at "first" */
1349 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
1350 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
1351 sha1_size_cache = xrealloc(sha1_size_cache,
1352 sha1_size_cache_alloc *
1353 sizeof(*sha1_size_cache));
1354 }
1355 sha1_size_cache_nr++;
1356 if (first < sha1_size_cache_nr)
1357 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
1358 (sha1_size_cache_nr - first - 1) *
1359 sizeof(*sha1_size_cache));
1360 e = xmalloc(sizeof(struct sha1_size_cache));
1361 sha1_size_cache[first] = e;
1362 hashcpy(e->sha1, sha1);
1363 e->size = size;
1364 return e;
1365 }
1366
1367 static int populate_from_stdin(struct diff_filespec *s)
1368 {
1369 #define INCREMENT 1024
1370 char *buf;
1371 unsigned long size;
1372 int got;
1373
1374 size = 0;
1375 buf = NULL;
1376 while (1) {
1377 buf = xrealloc(buf, size + INCREMENT);
1378 got = xread(0, buf + size, INCREMENT);
1379 if (!got)
1380 break; /* EOF */
1381 if (got < 0)
1382 return error("error while reading from stdin %s",
1383 strerror(errno));
1384 size += got;
1385 }
1386 s->should_munmap = 0;
1387 s->data = buf;
1388 s->size = size;
1389 s->should_free = 1;
1390 return 0;
1391 }
1392
1393 /*
1394 * While doing rename detection and pickaxe operation, we may need to
1395 * grab the data for the blob (or file) for our own in-core comparison.
1396 * diff_filespec has data and size fields for this purpose.
1397 */
1398 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1399 {
1400 int err = 0;
1401 if (!DIFF_FILE_VALID(s))
1402 die("internal error: asking to populate invalid file.");
1403 if (S_ISDIR(s->mode))
1404 return -1;
1405
1406 if (!use_size_cache)
1407 size_only = 0;
1408
1409 if (s->data)
1410 return err;
1411 if (!s->sha1_valid ||
1412 reuse_worktree_file(s->path, s->sha1, 0)) {
1413 struct stat st;
1414 int fd;
1415 char *buf;
1416 unsigned long size;
1417
1418 if (!strcmp(s->path, "-"))
1419 return populate_from_stdin(s);
1420
1421 if (lstat(s->path, &st) < 0) {
1422 if (errno == ENOENT) {
1423 err_empty:
1424 err = -1;
1425 empty:
1426 s->data = (char *)"";
1427 s->size = 0;
1428 return err;
1429 }
1430 }
1431 s->size = xsize_t(st.st_size);
1432 if (!s->size)
1433 goto empty;
1434 if (size_only)
1435 return 0;
1436 if (S_ISLNK(st.st_mode)) {
1437 int ret;
1438 s->data = xmalloc(s->size);
1439 s->should_free = 1;
1440 ret = readlink(s->path, s->data, s->size);
1441 if (ret < 0) {
1442 free(s->data);
1443 goto err_empty;
1444 }
1445 return 0;
1446 }
1447 fd = open(s->path, O_RDONLY);
1448 if (fd < 0)
1449 goto err_empty;
1450 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1451 close(fd);
1452 s->should_munmap = 1;
1453
1454 /*
1455 * Convert from working tree format to canonical git format
1456 */
1457 buf = s->data;
1458 size = s->size;
1459 if (convert_to_git(s->path, &buf, &size)) {
1460 munmap(s->data, s->size);
1461 s->should_munmap = 0;
1462 s->data = buf;
1463 s->size = size;
1464 s->should_free = 1;
1465 }
1466 }
1467 else {
1468 enum object_type type;
1469 struct sha1_size_cache *e;
1470
1471 if (size_only) {
1472 e = locate_size_cache(s->sha1, 1, 0);
1473 if (e) {
1474 s->size = e->size;
1475 return 0;
1476 }
1477 type = sha1_object_info(s->sha1, &s->size);
1478 if (type < 0)
1479 locate_size_cache(s->sha1, 0, s->size);
1480 }
1481 else {
1482 s->data = read_sha1_file(s->sha1, &type, &s->size);
1483 s->should_free = 1;
1484 }
1485 }
1486 return 0;
1487 }
1488
1489 void diff_free_filespec_data(struct diff_filespec *s)
1490 {
1491 if (s->should_free)
1492 free(s->data);
1493 else if (s->should_munmap)
1494 munmap(s->data, s->size);
1495 s->should_free = s->should_munmap = 0;
1496 s->data = NULL;
1497 free(s->cnt_data);
1498 s->cnt_data = NULL;
1499 }
1500
1501 static void prep_temp_blob(struct diff_tempfile *temp,
1502 void *blob,
1503 unsigned long size,
1504 const unsigned char *sha1,
1505 int mode)
1506 {
1507 int fd;
1508
1509 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
1510 if (fd < 0)
1511 die("unable to create temp-file");
1512 if (write_in_full(fd, blob, size) != size)
1513 die("unable to write temp-file");
1514 close(fd);
1515 temp->name = temp->tmp_path;
1516 strcpy(temp->hex, sha1_to_hex(sha1));
1517 temp->hex[40] = 0;
1518 sprintf(temp->mode, "%06o", mode);
1519 }
1520
1521 static void prepare_temp_file(const char *name,
1522 struct diff_tempfile *temp,
1523 struct diff_filespec *one)
1524 {
1525 if (!DIFF_FILE_VALID(one)) {
1526 not_a_valid_file:
1527 /* A '-' entry produces this for file-2, and
1528 * a '+' entry produces this for file-1.
1529 */
1530 temp->name = "/dev/null";
1531 strcpy(temp->hex, ".");
1532 strcpy(temp->mode, ".");
1533 return;
1534 }
1535
1536 if (!one->sha1_valid ||
1537 reuse_worktree_file(name, one->sha1, 1)) {
1538 struct stat st;
1539 if (lstat(name, &st) < 0) {
1540 if (errno == ENOENT)
1541 goto not_a_valid_file;
1542 die("stat(%s): %s", name, strerror(errno));
1543 }
1544 if (S_ISLNK(st.st_mode)) {
1545 int ret;
1546 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1547 size_t sz = xsize_t(st.st_size);
1548 if (sizeof(buf) <= st.st_size)
1549 die("symlink too long: %s", name);
1550 ret = readlink(name, buf, sz);
1551 if (ret < 0)
1552 die("readlink(%s)", name);
1553 prep_temp_blob(temp, buf, sz,
1554 (one->sha1_valid ?
1555 one->sha1 : null_sha1),
1556 (one->sha1_valid ?
1557 one->mode : S_IFLNK));
1558 }
1559 else {
1560 /* we can borrow from the file in the work tree */
1561 temp->name = name;
1562 if (!one->sha1_valid)
1563 strcpy(temp->hex, sha1_to_hex(null_sha1));
1564 else
1565 strcpy(temp->hex, sha1_to_hex(one->sha1));
1566 /* Even though we may sometimes borrow the
1567 * contents from the work tree, we always want
1568 * one->mode. mode is trustworthy even when
1569 * !(one->sha1_valid), as long as
1570 * DIFF_FILE_VALID(one).
1571 */
1572 sprintf(temp->mode, "%06o", one->mode);
1573 }
1574 return;
1575 }
1576 else {
1577 if (diff_populate_filespec(one, 0))
1578 die("cannot read data blob for %s", one->path);
1579 prep_temp_blob(temp, one->data, one->size,
1580 one->sha1, one->mode);
1581 }
1582 }
1583
1584 static void remove_tempfile(void)
1585 {
1586 int i;
1587
1588 for (i = 0; i < 2; i++)
1589 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1590 unlink(diff_temp[i].name);
1591 diff_temp[i].name = NULL;
1592 }
1593 }
1594
1595 static void remove_tempfile_on_signal(int signo)
1596 {
1597 remove_tempfile();
1598 signal(SIGINT, SIG_DFL);
1599 raise(signo);
1600 }
1601
1602 static int spawn_prog(const char *pgm, const char **arg)
1603 {
1604 pid_t pid;
1605 int status;
1606
1607 fflush(NULL);
1608 pid = fork();
1609 if (pid < 0)
1610 die("unable to fork");
1611 if (!pid) {
1612 execvp(pgm, (char *const*) arg);
1613 exit(255);
1614 }
1615
1616 while (waitpid(pid, &status, 0) < 0) {
1617 if (errno == EINTR)
1618 continue;
1619 return -1;
1620 }
1621
1622 /* Earlier we did not check the exit status because
1623 * diff exits non-zero if files are different, and
1624 * we are not interested in knowing that. It was a
1625 * mistake which made it harder to quit a diff-*
1626 * session that uses the git-apply-patch-script as
1627 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1628 * should also exit non-zero only when it wants to
1629 * abort the entire diff-* session.
1630 */
1631 if (WIFEXITED(status) && !WEXITSTATUS(status))
1632 return 0;
1633 return -1;
1634 }
1635
1636 /* An external diff command takes:
1637 *
1638 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1639 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1640 *
1641 */
1642 static void run_external_diff(const char *pgm,
1643 const char *name,
1644 const char *other,
1645 struct diff_filespec *one,
1646 struct diff_filespec *two,
1647 const char *xfrm_msg,
1648 int complete_rewrite)
1649 {
1650 const char *spawn_arg[10];
1651 struct diff_tempfile *temp = diff_temp;
1652 int retval;
1653 static int atexit_asked = 0;
1654 const char *othername;
1655 const char **arg = &spawn_arg[0];
1656
1657 othername = (other? other : name);
1658 if (one && two) {
1659 prepare_temp_file(name, &temp[0], one);
1660 prepare_temp_file(othername, &temp[1], two);
1661 if (! atexit_asked &&
1662 (temp[0].name == temp[0].tmp_path ||
1663 temp[1].name == temp[1].tmp_path)) {
1664 atexit_asked = 1;
1665 atexit(remove_tempfile);
1666 }
1667 signal(SIGINT, remove_tempfile_on_signal);
1668 }
1669
1670 if (one && two) {
1671 *arg++ = pgm;
1672 *arg++ = name;
1673 *arg++ = temp[0].name;
1674 *arg++ = temp[0].hex;
1675 *arg++ = temp[0].mode;
1676 *arg++ = temp[1].name;
1677 *arg++ = temp[1].hex;
1678 *arg++ = temp[1].mode;
1679 if (other) {
1680 *arg++ = other;
1681 *arg++ = xfrm_msg;
1682 }
1683 } else {
1684 *arg++ = pgm;
1685 *arg++ = name;
1686 }
1687 *arg = NULL;
1688 retval = spawn_prog(pgm, spawn_arg);
1689 remove_tempfile();
1690 if (retval) {
1691 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1692 exit(1);
1693 }
1694 }
1695
1696 static void run_diff_cmd(const char *pgm,
1697 const char *name,
1698 const char *other,
1699 struct diff_filespec *one,
1700 struct diff_filespec *two,
1701 const char *xfrm_msg,
1702 struct diff_options *o,
1703 int complete_rewrite)
1704 {
1705 if (pgm) {
1706 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1707 complete_rewrite);
1708 return;
1709 }
1710 if (one && two)
1711 builtin_diff(name, other ? other : name,
1712 one, two, xfrm_msg, o, complete_rewrite);
1713 else
1714 printf("* Unmerged path %s\n", name);
1715 }
1716
1717 static void diff_fill_sha1_info(struct diff_filespec *one)
1718 {
1719 if (DIFF_FILE_VALID(one)) {
1720 if (!one->sha1_valid) {
1721 struct stat st;
1722 if (!strcmp(one->path, "-")) {
1723 hashcpy(one->sha1, null_sha1);
1724 return;
1725 }
1726 if (lstat(one->path, &st) < 0)
1727 die("stat %s", one->path);
1728 if (index_path(one->sha1, one->path, &st, 0))
1729 die("cannot hash %s\n", one->path);
1730 }
1731 }
1732 else
1733 hashclr(one->sha1);
1734 }
1735
1736 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1737 {
1738 const char *pgm = external_diff();
1739 char msg[PATH_MAX*2+300], *xfrm_msg;
1740 struct diff_filespec *one;
1741 struct diff_filespec *two;
1742 const char *name;
1743 const char *other;
1744 char *name_munged, *other_munged;
1745 int complete_rewrite = 0;
1746 int len;
1747
1748 if (DIFF_PAIR_UNMERGED(p)) {
1749 /* unmerged */
1750 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1751 return;
1752 }
1753
1754 name = p->one->path;
1755 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1756 name_munged = quote_one(name);
1757 other_munged = quote_one(other);
1758 one = p->one; two = p->two;
1759
1760 diff_fill_sha1_info(one);
1761 diff_fill_sha1_info(two);
1762
1763 len = 0;
1764 switch (p->status) {
1765 case DIFF_STATUS_COPIED:
1766 len += snprintf(msg + len, sizeof(msg) - len,
1767 "similarity index %d%%\n"
1768 "copy from %s\n"
1769 "copy to %s\n",
1770 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1771 name_munged, other_munged);
1772 break;
1773 case DIFF_STATUS_RENAMED:
1774 len += snprintf(msg + len, sizeof(msg) - len,
1775 "similarity index %d%%\n"
1776 "rename from %s\n"
1777 "rename to %s\n",
1778 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1779 name_munged, other_munged);
1780 break;
1781 case DIFF_STATUS_MODIFIED:
1782 if (p->score) {
1783 len += snprintf(msg + len, sizeof(msg) - len,
1784 "dissimilarity index %d%%\n",
1785 (int)(0.5 + p->score *
1786 100.0/MAX_SCORE));
1787 complete_rewrite = 1;
1788 break;
1789 }
1790 /* fallthru */
1791 default:
1792 /* nothing */
1793 ;
1794 }
1795
1796 if (hashcmp(one->sha1, two->sha1)) {
1797 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1798
1799 if (o->binary) {
1800 mmfile_t mf;
1801 if ((!fill_mmfile(&mf, one) && mmfile_is_binary(&mf)) ||
1802 (!fill_mmfile(&mf, two) && mmfile_is_binary(&mf)))
1803 abbrev = 40;
1804 }
1805 len += snprintf(msg + len, sizeof(msg) - len,
1806 "index %.*s..%.*s",
1807 abbrev, sha1_to_hex(one->sha1),
1808 abbrev, sha1_to_hex(two->sha1));
1809 if (one->mode == two->mode)
1810 len += snprintf(msg + len, sizeof(msg) - len,
1811 " %06o", one->mode);
1812 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1813 }
1814
1815 if (len)
1816 msg[--len] = 0;
1817 xfrm_msg = len ? msg : NULL;
1818
1819 if (!pgm &&
1820 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1821 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1822 /* a filepair that changes between file and symlink
1823 * needs to be split into deletion and creation.
1824 */
1825 struct diff_filespec *null = alloc_filespec(two->path);
1826 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1827 free(null);
1828 null = alloc_filespec(one->path);
1829 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1830 free(null);
1831 }
1832 else
1833 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1834 complete_rewrite);
1835
1836 free(name_munged);
1837 free(other_munged);
1838 }
1839
1840 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1841 struct diffstat_t *diffstat)
1842 {
1843 const char *name;
1844 const char *other;
1845 int complete_rewrite = 0;
1846
1847 if (DIFF_PAIR_UNMERGED(p)) {
1848 /* unmerged */
1849 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1850 return;
1851 }
1852
1853 name = p->one->path;
1854 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1855
1856 diff_fill_sha1_info(p->one);
1857 diff_fill_sha1_info(p->two);
1858
1859 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1860 complete_rewrite = 1;
1861 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
1862 }
1863
1864 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1865 {
1866 const char *name;
1867 const char *other;
1868
1869 if (DIFF_PAIR_UNMERGED(p)) {
1870 /* unmerged */
1871 return;
1872 }
1873
1874 name = p->one->path;
1875 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1876
1877 diff_fill_sha1_info(p->one);
1878 diff_fill_sha1_info(p->two);
1879
1880 builtin_checkdiff(name, other, p->one, p->two, o);
1881 }
1882
1883 void diff_setup(struct diff_options *options)
1884 {
1885 memset(options, 0, sizeof(*options));
1886 options->line_termination = '\n';
1887 options->break_opt = -1;
1888 options->rename_limit = -1;
1889 options->context = 3;
1890 options->msg_sep = "";
1891
1892 options->change = diff_change;
1893 options->add_remove = diff_addremove;
1894 options->color_diff = diff_use_color_default;
1895 options->detect_rename = diff_detect_rename_default;
1896 }
1897
1898 int diff_setup_done(struct diff_options *options)
1899 {
1900 int count = 0;
1901
1902 if (options->output_format & DIFF_FORMAT_NAME)
1903 count++;
1904 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
1905 count++;
1906 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
1907 count++;
1908 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
1909 count++;
1910 if (count > 1)
1911 die("--name-only, --name-status, --check and -s are mutually exclusive");
1912
1913 if (options->find_copies_harder)
1914 options->detect_rename = DIFF_DETECT_COPY;
1915
1916 if (options->output_format & (DIFF_FORMAT_NAME |
1917 DIFF_FORMAT_NAME_STATUS |
1918 DIFF_FORMAT_CHECKDIFF |
1919 DIFF_FORMAT_NO_OUTPUT))
1920 options->output_format &= ~(DIFF_FORMAT_RAW |
1921 DIFF_FORMAT_NUMSTAT |
1922 DIFF_FORMAT_DIFFSTAT |
1923 DIFF_FORMAT_SHORTSTAT |
1924 DIFF_FORMAT_SUMMARY |
1925 DIFF_FORMAT_PATCH);
1926
1927 /*
1928 * These cases always need recursive; we do not drop caller-supplied
1929 * recursive bits for other formats here.
1930 */
1931 if (options->output_format & (DIFF_FORMAT_PATCH |
1932 DIFF_FORMAT_NUMSTAT |
1933 DIFF_FORMAT_DIFFSTAT |
1934 DIFF_FORMAT_SHORTSTAT |
1935 DIFF_FORMAT_SUMMARY |
1936 DIFF_FORMAT_CHECKDIFF))
1937 options->recursive = 1;
1938 /*
1939 * Also pickaxe would not work very well if you do not say recursive
1940 */
1941 if (options->pickaxe)
1942 options->recursive = 1;
1943
1944 if (options->detect_rename && options->rename_limit < 0)
1945 options->rename_limit = diff_rename_limit_default;
1946 if (options->setup & DIFF_SETUP_USE_CACHE) {
1947 if (!active_cache)
1948 /* read-cache does not die even when it fails
1949 * so it is safe for us to do this here. Also
1950 * it does not smudge active_cache or active_nr
1951 * when it fails, so we do not have to worry about
1952 * cleaning it up ourselves either.
1953 */
1954 read_cache();
1955 }
1956 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
1957 use_size_cache = 1;
1958 if (options->abbrev <= 0 || 40 < options->abbrev)
1959 options->abbrev = 40; /* full */
1960
1961 return 0;
1962 }
1963
1964 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
1965 {
1966 char c, *eq;
1967 int len;
1968
1969 if (*arg != '-')
1970 return 0;
1971 c = *++arg;
1972 if (!c)
1973 return 0;
1974 if (c == arg_short) {
1975 c = *++arg;
1976 if (!c)
1977 return 1;
1978 if (val && isdigit(c)) {
1979 char *end;
1980 int n = strtoul(arg, &end, 10);
1981 if (*end)
1982 return 0;
1983 *val = n;
1984 return 1;
1985 }
1986 return 0;
1987 }
1988 if (c != '-')
1989 return 0;
1990 arg++;
1991 eq = strchr(arg, '=');
1992 if (eq)
1993 len = eq - arg;
1994 else
1995 len = strlen(arg);
1996 if (!len || strncmp(arg, arg_long, len))
1997 return 0;
1998 if (eq) {
1999 int n;
2000 char *end;
2001 if (!isdigit(*++eq))
2002 return 0;
2003 n = strtoul(eq, &end, 10);
2004 if (*end)
2005 return 0;
2006 *val = n;
2007 }
2008 return 1;
2009 }
2010
2011 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2012 {
2013 const char *arg = av[0];
2014 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2015 options->output_format |= DIFF_FORMAT_PATCH;
2016 else if (opt_arg(arg, 'U', "unified", &options->context))
2017 options->output_format |= DIFF_FORMAT_PATCH;
2018 else if (!strcmp(arg, "--raw"))
2019 options->output_format |= DIFF_FORMAT_RAW;
2020 else if (!strcmp(arg, "--patch-with-raw")) {
2021 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2022 }
2023 else if (!strcmp(arg, "--numstat")) {
2024 options->output_format |= DIFF_FORMAT_NUMSTAT;
2025 }
2026 else if (!strcmp(arg, "--shortstat")) {
2027 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2028 }
2029 else if (!prefixcmp(arg, "--stat")) {
2030 char *end;
2031 int width = options->stat_width;
2032 int name_width = options->stat_name_width;
2033 arg += 6;
2034 end = (char *)arg;
2035
2036 switch (*arg) {
2037 case '-':
2038 if (!prefixcmp(arg, "-width="))
2039 width = strtoul(arg + 7, &end, 10);
2040 else if (!prefixcmp(arg, "-name-width="))
2041 name_width = strtoul(arg + 12, &end, 10);
2042 break;
2043 case '=':
2044 width = strtoul(arg+1, &end, 10);
2045 if (*end == ',')
2046 name_width = strtoul(end+1, &end, 10);
2047 }
2048
2049 /* Important! This checks all the error cases! */
2050 if (*end)
2051 return 0;
2052 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2053 options->stat_name_width = name_width;
2054 options->stat_width = width;
2055 }
2056 else if (!strcmp(arg, "--check"))
2057 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2058 else if (!strcmp(arg, "--summary"))
2059 options->output_format |= DIFF_FORMAT_SUMMARY;
2060 else if (!strcmp(arg, "--patch-with-stat")) {
2061 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2062 }
2063 else if (!strcmp(arg, "-z"))
2064 options->line_termination = 0;
2065 else if (!prefixcmp(arg, "-l"))
2066 options->rename_limit = strtoul(arg+2, NULL, 10);
2067 else if (!strcmp(arg, "--full-index"))
2068 options->full_index = 1;
2069 else if (!strcmp(arg, "--binary")) {
2070 options->output_format |= DIFF_FORMAT_PATCH;
2071 options->binary = 1;
2072 }
2073 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
2074 options->text = 1;
2075 }
2076 else if (!strcmp(arg, "--name-only"))
2077 options->output_format |= DIFF_FORMAT_NAME;
2078 else if (!strcmp(arg, "--name-status"))
2079 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2080 else if (!strcmp(arg, "-R"))
2081 options->reverse_diff = 1;
2082 else if (!prefixcmp(arg, "-S"))
2083 options->pickaxe = arg + 2;
2084 else if (!strcmp(arg, "-s")) {
2085 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2086 }
2087 else if (!prefixcmp(arg, "-O"))
2088 options->orderfile = arg + 2;
2089 else if (!prefixcmp(arg, "--diff-filter="))
2090 options->filter = arg + 14;
2091 else if (!strcmp(arg, "--pickaxe-all"))
2092 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2093 else if (!strcmp(arg, "--pickaxe-regex"))
2094 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2095 else if (!prefixcmp(arg, "-B")) {
2096 if ((options->break_opt =
2097 diff_scoreopt_parse(arg)) == -1)
2098 return -1;
2099 }
2100 else if (!prefixcmp(arg, "-M")) {
2101 if ((options->rename_score =
2102 diff_scoreopt_parse(arg)) == -1)
2103 return -1;
2104 options->detect_rename = DIFF_DETECT_RENAME;
2105 }
2106 else if (!prefixcmp(arg, "-C")) {
2107 if ((options->rename_score =
2108 diff_scoreopt_parse(arg)) == -1)
2109 return -1;
2110 options->detect_rename = DIFF_DETECT_COPY;
2111 }
2112 else if (!strcmp(arg, "--find-copies-harder"))
2113 options->find_copies_harder = 1;
2114 else if (!strcmp(arg, "--abbrev"))
2115 options->abbrev = DEFAULT_ABBREV;
2116 else if (!prefixcmp(arg, "--abbrev=")) {
2117 options->abbrev = strtoul(arg + 9, NULL, 10);
2118 if (options->abbrev < MINIMUM_ABBREV)
2119 options->abbrev = MINIMUM_ABBREV;
2120 else if (40 < options->abbrev)
2121 options->abbrev = 40;
2122 }
2123 else if (!strcmp(arg, "--color"))
2124 options->color_diff = 1;
2125 else if (!strcmp(arg, "--no-color"))
2126 options->color_diff = 0;
2127 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2128 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2129 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2130 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2131 else if (!strcmp(arg, "--ignore-space-at-eol"))
2132 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2133 else if (!strcmp(arg, "--color-words"))
2134 options->color_diff = options->color_diff_words = 1;
2135 else if (!strcmp(arg, "--no-renames"))
2136 options->detect_rename = 0;
2137 else
2138 return 0;
2139 return 1;
2140 }
2141
2142 static int parse_num(const char **cp_p)
2143 {
2144 unsigned long num, scale;
2145 int ch, dot;
2146 const char *cp = *cp_p;
2147
2148 num = 0;
2149 scale = 1;
2150 dot = 0;
2151 for(;;) {
2152 ch = *cp;
2153 if ( !dot && ch == '.' ) {
2154 scale = 1;
2155 dot = 1;
2156 } else if ( ch == '%' ) {
2157 scale = dot ? scale*100 : 100;
2158 cp++; /* % is always at the end */
2159 break;
2160 } else if ( ch >= '0' && ch <= '9' ) {
2161 if ( scale < 100000 ) {
2162 scale *= 10;
2163 num = (num*10) + (ch-'0');
2164 }
2165 } else {
2166 break;
2167 }
2168 cp++;
2169 }
2170 *cp_p = cp;
2171
2172 /* user says num divided by scale and we say internally that
2173 * is MAX_SCORE * num / scale.
2174 */
2175 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2176 }
2177
2178 int diff_scoreopt_parse(const char *opt)
2179 {
2180 int opt1, opt2, cmd;
2181
2182 if (*opt++ != '-')
2183 return -1;
2184 cmd = *opt++;
2185 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2186 return -1; /* that is not a -M, -C nor -B option */
2187
2188 opt1 = parse_num(&opt);
2189 if (cmd != 'B')
2190 opt2 = 0;
2191 else {
2192 if (*opt == 0)
2193 opt2 = 0;
2194 else if (*opt != '/')
2195 return -1; /* we expect -B80/99 or -B80 */
2196 else {
2197 opt++;
2198 opt2 = parse_num(&opt);
2199 }
2200 }
2201 if (*opt != 0)
2202 return -1;
2203 return opt1 | (opt2 << 16);
2204 }
2205
2206 struct diff_queue_struct diff_queued_diff;
2207
2208 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2209 {
2210 if (queue->alloc <= queue->nr) {
2211 queue->alloc = alloc_nr(queue->alloc);
2212 queue->queue = xrealloc(queue->queue,
2213 sizeof(dp) * queue->alloc);
2214 }
2215 queue->queue[queue->nr++] = dp;
2216 }
2217
2218 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2219 struct diff_filespec *one,
2220 struct diff_filespec *two)
2221 {
2222 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2223 dp->one = one;
2224 dp->two = two;
2225 if (queue)
2226 diff_q(queue, dp);
2227 return dp;
2228 }
2229
2230 void diff_free_filepair(struct diff_filepair *p)
2231 {
2232 diff_free_filespec_data(p->one);
2233 diff_free_filespec_data(p->two);
2234 free(p->one);
2235 free(p->two);
2236 free(p);
2237 }
2238
2239 /* This is different from find_unique_abbrev() in that
2240 * it stuffs the result with dots for alignment.
2241 */
2242 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2243 {
2244 int abblen;
2245 const char *abbrev;
2246 if (len == 40)
2247 return sha1_to_hex(sha1);
2248
2249 abbrev = find_unique_abbrev(sha1, len);
2250 if (!abbrev)
2251 return sha1_to_hex(sha1);
2252 abblen = strlen(abbrev);
2253 if (abblen < 37) {
2254 static char hex[41];
2255 if (len < abblen && abblen <= len + 2)
2256 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2257 else
2258 sprintf(hex, "%s...", abbrev);
2259 return hex;
2260 }
2261 return sha1_to_hex(sha1);
2262 }
2263
2264 static void diff_flush_raw(struct diff_filepair *p,
2265 struct diff_options *options)
2266 {
2267 int two_paths;
2268 char status[10];
2269 int abbrev = options->abbrev;
2270 const char *path_one, *path_two;
2271 int inter_name_termination = '\t';
2272 int line_termination = options->line_termination;
2273
2274 if (!line_termination)
2275 inter_name_termination = 0;
2276
2277 path_one = p->one->path;
2278 path_two = p->two->path;
2279 if (line_termination) {
2280 path_one = quote_one(path_one);
2281 path_two = quote_one(path_two);
2282 }
2283
2284 if (p->score)
2285 sprintf(status, "%c%03d", p->status,
2286 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2287 else {
2288 status[0] = p->status;
2289 status[1] = 0;
2290 }
2291 switch (p->status) {
2292 case DIFF_STATUS_COPIED:
2293 case DIFF_STATUS_RENAMED:
2294 two_paths = 1;
2295 break;
2296 case DIFF_STATUS_ADDED:
2297 case DIFF_STATUS_DELETED:
2298 two_paths = 0;
2299 break;
2300 default:
2301 two_paths = 0;
2302 break;
2303 }
2304 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
2305 printf(":%06o %06o %s ",
2306 p->one->mode, p->two->mode,
2307 diff_unique_abbrev(p->one->sha1, abbrev));
2308 printf("%s ",
2309 diff_unique_abbrev(p->two->sha1, abbrev));
2310 }
2311 printf("%s%c%s", status, inter_name_termination, path_one);
2312 if (two_paths)
2313 printf("%c%s", inter_name_termination, path_two);
2314 putchar(line_termination);
2315 if (path_one != p->one->path)
2316 free((void*)path_one);
2317 if (path_two != p->two->path)
2318 free((void*)path_two);
2319 }
2320
2321 static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
2322 {
2323 char *path = p->two->path;
2324
2325 if (opt->line_termination)
2326 path = quote_one(p->two->path);
2327 printf("%s%c", path, opt->line_termination);
2328 if (p->two->path != path)
2329 free(path);
2330 }
2331
2332 int diff_unmodified_pair(struct diff_filepair *p)
2333 {
2334 /* This function is written stricter than necessary to support
2335 * the currently implemented transformers, but the idea is to
2336 * let transformers to produce diff_filepairs any way they want,
2337 * and filter and clean them up here before producing the output.
2338 */
2339 struct diff_filespec *one, *two;
2340
2341 if (DIFF_PAIR_UNMERGED(p))
2342 return 0; /* unmerged is interesting */
2343
2344 one = p->one;
2345 two = p->two;
2346
2347 /* deletion, addition, mode or type change
2348 * and rename are all interesting.
2349 */
2350 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2351 DIFF_PAIR_MODE_CHANGED(p) ||
2352 strcmp(one->path, two->path))
2353 return 0;
2354
2355 /* both are valid and point at the same path. that is, we are
2356 * dealing with a change.
2357 */
2358 if (one->sha1_valid && two->sha1_valid &&
2359 !hashcmp(one->sha1, two->sha1))
2360 return 1; /* no change */
2361 if (!one->sha1_valid && !two->sha1_valid)
2362 return 1; /* both look at the same file on the filesystem. */
2363 return 0;
2364 }
2365
2366 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2367 {
2368 if (diff_unmodified_pair(p))
2369 return;
2370
2371 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2372 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2373 return; /* no tree diffs in patch format */
2374
2375 run_diff(p, o);
2376 }
2377
2378 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2379 struct diffstat_t *diffstat)
2380 {
2381 if (diff_unmodified_pair(p))
2382 return;
2383
2384 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2385 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2386 return; /* no tree diffs in patch format */
2387
2388 run_diffstat(p, o, diffstat);
2389 }
2390
2391 static void diff_flush_checkdiff(struct diff_filepair *p,
2392 struct diff_options *o)
2393 {
2394 if (diff_unmodified_pair(p))
2395 return;
2396
2397 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2398 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2399 return; /* no tree diffs in patch format */
2400
2401 run_checkdiff(p, o);
2402 }
2403
2404 int diff_queue_is_empty(void)
2405 {
2406 struct diff_queue_struct *q = &diff_queued_diff;
2407 int i;
2408 for (i = 0; i < q->nr; i++)
2409 if (!diff_unmodified_pair(q->queue[i]))
2410 return 0;
2411 return 1;
2412 }
2413
2414 #if DIFF_DEBUG
2415 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2416 {
2417 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2418 x, one ? one : "",
2419 s->path,
2420 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2421 s->mode,
2422 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2423 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2424 x, one ? one : "",
2425 s->size, s->xfrm_flags);
2426 }
2427
2428 void diff_debug_filepair(const struct diff_filepair *p, int i)
2429 {
2430 diff_debug_filespec(p->one, i, "one");
2431 diff_debug_filespec(p->two, i, "two");
2432 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2433 p->score, p->status ? p->status : '?',
2434 p->source_stays, p->broken_pair);
2435 }
2436
2437 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2438 {
2439 int i;
2440 if (msg)
2441 fprintf(stderr, "%s\n", msg);
2442 fprintf(stderr, "q->nr = %d\n", q->nr);
2443 for (i = 0; i < q->nr; i++) {
2444 struct diff_filepair *p = q->queue[i];
2445 diff_debug_filepair(p, i);
2446 }
2447 }
2448 #endif
2449
2450 static void diff_resolve_rename_copy(void)
2451 {
2452 int i, j;
2453 struct diff_filepair *p, *pp;
2454 struct diff_queue_struct *q = &diff_queued_diff;
2455
2456 diff_debug_queue("resolve-rename-copy", q);
2457
2458 for (i = 0; i < q->nr; i++) {
2459 p = q->queue[i];
2460 p->status = 0; /* undecided */
2461 if (DIFF_PAIR_UNMERGED(p))
2462 p->status = DIFF_STATUS_UNMERGED;
2463 else if (!DIFF_FILE_VALID(p->one))
2464 p->status = DIFF_STATUS_ADDED;
2465 else if (!DIFF_FILE_VALID(p->two))
2466 p->status = DIFF_STATUS_DELETED;
2467 else if (DIFF_PAIR_TYPE_CHANGED(p))
2468 p->status = DIFF_STATUS_TYPE_CHANGED;
2469
2470 /* from this point on, we are dealing with a pair
2471 * whose both sides are valid and of the same type, i.e.
2472 * either in-place edit or rename/copy edit.
2473 */
2474 else if (DIFF_PAIR_RENAME(p)) {
2475 if (p->source_stays) {
2476 p->status = DIFF_STATUS_COPIED;
2477 continue;
2478 }
2479 /* See if there is some other filepair that
2480 * copies from the same source as us. If so
2481 * we are a copy. Otherwise we are either a
2482 * copy if the path stays, or a rename if it
2483 * does not, but we already handled "stays" case.
2484 */
2485 for (j = i + 1; j < q->nr; j++) {
2486 pp = q->queue[j];
2487 if (strcmp(pp->one->path, p->one->path))
2488 continue; /* not us */
2489 if (!DIFF_PAIR_RENAME(pp))
2490 continue; /* not a rename/copy */
2491 /* pp is a rename/copy from the same source */
2492 p->status = DIFF_STATUS_COPIED;
2493 break;
2494 }
2495 if (!p->status)
2496 p->status = DIFF_STATUS_RENAMED;
2497 }
2498 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2499 p->one->mode != p->two->mode ||
2500 is_null_sha1(p->one->sha1))
2501 p->status = DIFF_STATUS_MODIFIED;
2502 else {
2503 /* This is a "no-change" entry and should not
2504 * happen anymore, but prepare for broken callers.
2505 */
2506 error("feeding unmodified %s to diffcore",
2507 p->one->path);
2508 p->status = DIFF_STATUS_UNKNOWN;
2509 }
2510 }
2511 diff_debug_queue("resolve-rename-copy done", q);
2512 }
2513
2514 static int check_pair_status(struct diff_filepair *p)
2515 {
2516 switch (p->status) {
2517 case DIFF_STATUS_UNKNOWN:
2518 return 0;
2519 case 0:
2520 die("internal error in diff-resolve-rename-copy");
2521 default:
2522 return 1;
2523 }
2524 }
2525
2526 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2527 {
2528 int fmt = opt->output_format;
2529
2530 if (fmt & DIFF_FORMAT_CHECKDIFF)
2531 diff_flush_checkdiff(p, opt);
2532 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2533 diff_flush_raw(p, opt);
2534 else if (fmt & DIFF_FORMAT_NAME)
2535 diff_flush_name(p, opt);
2536 }
2537
2538 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2539 {
2540 char *name = quote_one(fs->path);
2541 if (fs->mode)
2542 printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
2543 else
2544 printf(" %s %s\n", newdelete, name);
2545 free(name);
2546 }
2547
2548
2549 static void show_mode_change(struct diff_filepair *p, int show_name)
2550 {
2551 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2552 if (show_name) {
2553 char *name = quote_one(p->two->path);
2554 printf(" mode change %06o => %06o %s\n",
2555 p->one->mode, p->two->mode, name);
2556 free(name);
2557 }
2558 else
2559 printf(" mode change %06o => %06o\n",
2560 p->one->mode, p->two->mode);
2561 }
2562 }
2563
2564 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2565 {
2566 char *names = pprint_rename(p->one->path, p->two->path);
2567
2568 printf(" %s %s (%d%%)\n", renamecopy, names,
2569 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2570 free(names);
2571 show_mode_change(p, 0);
2572 }
2573
2574 static void diff_summary(struct diff_filepair *p)
2575 {
2576 switch(p->status) {
2577 case DIFF_STATUS_DELETED:
2578 show_file_mode_name("delete", p->one);
2579 break;
2580 case DIFF_STATUS_ADDED:
2581 show_file_mode_name("create", p->two);
2582 break;
2583 case DIFF_STATUS_COPIED:
2584 show_rename_copy("copy", p);
2585 break;
2586 case DIFF_STATUS_RENAMED:
2587 show_rename_copy("rename", p);
2588 break;
2589 default:
2590 if (p->score) {
2591 char *name = quote_one(p->two->path);
2592 printf(" rewrite %s (%d%%)\n", name,
2593 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2594 free(name);
2595 show_mode_change(p, 0);
2596 } else show_mode_change(p, 1);
2597 break;
2598 }
2599 }
2600
2601 struct patch_id_t {
2602 struct xdiff_emit_state xm;
2603 SHA_CTX *ctx;
2604 int patchlen;
2605 };
2606
2607 static int remove_space(char *line, int len)
2608 {
2609 int i;
2610 char *dst = line;
2611 unsigned char c;
2612
2613 for (i = 0; i < len; i++)
2614 if (!isspace((c = line[i])))
2615 *dst++ = c;
2616
2617 return dst - line;
2618 }
2619
2620 static void patch_id_consume(void *priv, char *line, unsigned long len)
2621 {
2622 struct patch_id_t *data = priv;
2623 int new_len;
2624
2625 /* Ignore line numbers when computing the SHA1 of the patch */
2626 if (!prefixcmp(line, "@@ -"))
2627 return;
2628
2629 new_len = remove_space(line, len);
2630
2631 SHA1_Update(data->ctx, line, new_len);
2632 data->patchlen += new_len;
2633 }
2634
2635 /* returns 0 upon success, and writes result into sha1 */
2636 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2637 {
2638 struct diff_queue_struct *q = &diff_queued_diff;
2639 int i;
2640 SHA_CTX ctx;
2641 struct patch_id_t data;
2642 char buffer[PATH_MAX * 4 + 20];
2643
2644 SHA1_Init(&ctx);
2645 memset(&data, 0, sizeof(struct patch_id_t));
2646 data.ctx = &ctx;
2647 data.xm.consume = patch_id_consume;
2648
2649 for (i = 0; i < q->nr; i++) {
2650 xpparam_t xpp;
2651 xdemitconf_t xecfg;
2652 xdemitcb_t ecb;
2653 mmfile_t mf1, mf2;
2654 struct diff_filepair *p = q->queue[i];
2655 int len1, len2;
2656
2657 if (p->status == 0)
2658 return error("internal diff status error");
2659 if (p->status == DIFF_STATUS_UNKNOWN)
2660 continue;
2661 if (diff_unmodified_pair(p))
2662 continue;
2663 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2664 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2665 continue;
2666 if (DIFF_PAIR_UNMERGED(p))
2667 continue;
2668
2669 diff_fill_sha1_info(p->one);
2670 diff_fill_sha1_info(p->two);
2671 if (fill_mmfile(&mf1, p->one) < 0 ||
2672 fill_mmfile(&mf2, p->two) < 0)
2673 return error("unable to read files to diff");
2674
2675 /* Maybe hash p->two? into the patch id? */
2676 if (mmfile_is_binary(&mf2))
2677 continue;
2678
2679 len1 = remove_space(p->one->path, strlen(p->one->path));
2680 len2 = remove_space(p->two->path, strlen(p->two->path));
2681 if (p->one->mode == 0)
2682 len1 = snprintf(buffer, sizeof(buffer),
2683 "diff--gita/%.*sb/%.*s"
2684 "newfilemode%06o"
2685 "---/dev/null"
2686 "+++b/%.*s",
2687 len1, p->one->path,
2688 len2, p->two->path,
2689 p->two->mode,
2690 len2, p->two->path);
2691 else if (p->two->mode == 0)
2692 len1 = snprintf(buffer, sizeof(buffer),
2693 "diff--gita/%.*sb/%.*s"
2694 "deletedfilemode%06o"
2695 "---a/%.*s"
2696 "+++/dev/null",
2697 len1, p->one->path,
2698 len2, p->two->path,
2699 p->one->mode,
2700 len1, p->one->path);
2701 else
2702 len1 = snprintf(buffer, sizeof(buffer),
2703 "diff--gita/%.*sb/%.*s"
2704 "---a/%.*s"
2705 "+++b/%.*s",
2706 len1, p->one->path,
2707 len2, p->two->path,
2708 len1, p->one->path,
2709 len2, p->two->path);
2710 SHA1_Update(&ctx, buffer, len1);
2711
2712 xpp.flags = XDF_NEED_MINIMAL;
2713 xecfg.ctxlen = 3;
2714 xecfg.flags = XDL_EMIT_FUNCNAMES;
2715 ecb.outf = xdiff_outf;
2716 ecb.priv = &data;
2717 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2718 }
2719
2720 SHA1_Final(sha1, &ctx);
2721 return 0;
2722 }
2723
2724 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2725 {
2726 struct diff_queue_struct *q = &diff_queued_diff;
2727 int i;
2728 int result = diff_get_patch_id(options, sha1);
2729
2730 for (i = 0; i < q->nr; i++)
2731 diff_free_filepair(q->queue[i]);
2732
2733 free(q->queue);
2734 q->queue = NULL;
2735 q->nr = q->alloc = 0;
2736
2737 return result;
2738 }
2739
2740 static int is_summary_empty(const struct diff_queue_struct *q)
2741 {
2742 int i;
2743
2744 for (i = 0; i < q->nr; i++) {
2745 const struct diff_filepair *p = q->queue[i];
2746
2747 switch (p->status) {
2748 case DIFF_STATUS_DELETED:
2749 case DIFF_STATUS_ADDED:
2750 case DIFF_STATUS_COPIED:
2751 case DIFF_STATUS_RENAMED:
2752 return 0;
2753 default:
2754 if (p->score)
2755 return 0;
2756 if (p->one->mode && p->two->mode &&
2757 p->one->mode != p->two->mode)
2758 return 0;
2759 break;
2760 }
2761 }
2762 return 1;
2763 }
2764
2765 void diff_flush(struct diff_options *options)
2766 {
2767 struct diff_queue_struct *q = &diff_queued_diff;
2768 int i, output_format = options->output_format;
2769 int separator = 0;
2770
2771 /*
2772 * Order: raw, stat, summary, patch
2773 * or: name/name-status/checkdiff (other bits clear)
2774 */
2775 if (!q->nr)
2776 goto free_queue;
2777
2778 if (output_format & (DIFF_FORMAT_RAW |
2779 DIFF_FORMAT_NAME |
2780 DIFF_FORMAT_NAME_STATUS |
2781 DIFF_FORMAT_CHECKDIFF)) {
2782 for (i = 0; i < q->nr; i++) {
2783 struct diff_filepair *p = q->queue[i];
2784 if (check_pair_status(p))
2785 flush_one_pair(p, options);
2786 }
2787 separator++;
2788 }
2789
2790 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2791 struct diffstat_t diffstat;
2792
2793 memset(&diffstat, 0, sizeof(struct diffstat_t));
2794 diffstat.xm.consume = diffstat_consume;
2795 for (i = 0; i < q->nr; i++) {
2796 struct diff_filepair *p = q->queue[i];
2797 if (check_pair_status(p))
2798 diff_flush_stat(p, options, &diffstat);
2799 }
2800 if (output_format & DIFF_FORMAT_NUMSTAT)
2801 show_numstat(&diffstat, options);
2802 if (output_format & DIFF_FORMAT_DIFFSTAT)
2803 show_stats(&diffstat, options);
2804 else if (output_format & DIFF_FORMAT_SHORTSTAT)
2805 show_shortstats(&diffstat);
2806 separator++;
2807 }
2808
2809 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2810 for (i = 0; i < q->nr; i++)
2811 diff_summary(q->queue[i]);
2812 separator++;
2813 }
2814
2815 if (output_format & DIFF_FORMAT_PATCH) {
2816 if (separator) {
2817 if (options->stat_sep) {
2818 /* attach patch instead of inline */
2819 fputs(options->stat_sep, stdout);
2820 } else {
2821 putchar(options->line_termination);
2822 }
2823 }
2824
2825 for (i = 0; i < q->nr; i++) {
2826 struct diff_filepair *p = q->queue[i];
2827 if (check_pair_status(p))
2828 diff_flush_patch(p, options);
2829 }
2830 }
2831
2832 if (output_format & DIFF_FORMAT_CALLBACK)
2833 options->format_callback(q, options, options->format_callback_data);
2834
2835 for (i = 0; i < q->nr; i++)
2836 diff_free_filepair(q->queue[i]);
2837 free_queue:
2838 free(q->queue);
2839 q->queue = NULL;
2840 q->nr = q->alloc = 0;
2841 }
2842
2843 static void diffcore_apply_filter(const char *filter)
2844 {
2845 int i;
2846 struct diff_queue_struct *q = &diff_queued_diff;
2847 struct diff_queue_struct outq;
2848 outq.queue = NULL;
2849 outq.nr = outq.alloc = 0;
2850
2851 if (!filter)
2852 return;
2853
2854 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2855 int found;
2856 for (i = found = 0; !found && i < q->nr; i++) {
2857 struct diff_filepair *p = q->queue[i];
2858 if (((p->status == DIFF_STATUS_MODIFIED) &&
2859 ((p->score &&
2860 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2861 (!p->score &&
2862 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2863 ((p->status != DIFF_STATUS_MODIFIED) &&
2864 strchr(filter, p->status)))
2865 found++;
2866 }
2867 if (found)
2868 return;
2869
2870 /* otherwise we will clear the whole queue
2871 * by copying the empty outq at the end of this
2872 * function, but first clear the current entries
2873 * in the queue.
2874 */
2875 for (i = 0; i < q->nr; i++)
2876 diff_free_filepair(q->queue[i]);
2877 }
2878 else {
2879 /* Only the matching ones */
2880 for (i = 0; i < q->nr; i++) {
2881 struct diff_filepair *p = q->queue[i];
2882
2883 if (((p->status == DIFF_STATUS_MODIFIED) &&
2884 ((p->score &&
2885 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2886 (!p->score &&
2887 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2888 ((p->status != DIFF_STATUS_MODIFIED) &&
2889 strchr(filter, p->status)))
2890 diff_q(&outq, p);
2891 else
2892 diff_free_filepair(p);
2893 }
2894 }
2895 free(q->queue);
2896 *q = outq;
2897 }
2898
2899 void diffcore_std(struct diff_options *options)
2900 {
2901 if (options->break_opt != -1)
2902 diffcore_break(options->break_opt);
2903 if (options->detect_rename)
2904 diffcore_rename(options);
2905 if (options->break_opt != -1)
2906 diffcore_merge_broken();
2907 if (options->pickaxe)
2908 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2909 if (options->orderfile)
2910 diffcore_order(options->orderfile);
2911 diff_resolve_rename_copy();
2912 diffcore_apply_filter(options->filter);
2913 }
2914
2915
2916 void diffcore_std_no_resolve(struct diff_options *options)
2917 {
2918 if (options->pickaxe)
2919 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2920 if (options->orderfile)
2921 diffcore_order(options->orderfile);
2922 diffcore_apply_filter(options->filter);
2923 }
2924
2925 void diff_addremove(struct diff_options *options,
2926 int addremove, unsigned mode,
2927 const unsigned char *sha1,
2928 const char *base, const char *path)
2929 {
2930 char concatpath[PATH_MAX];
2931 struct diff_filespec *one, *two;
2932
2933 /* This may look odd, but it is a preparation for
2934 * feeding "there are unchanged files which should
2935 * not produce diffs, but when you are doing copy
2936 * detection you would need them, so here they are"
2937 * entries to the diff-core. They will be prefixed
2938 * with something like '=' or '*' (I haven't decided
2939 * which but should not make any difference).
2940 * Feeding the same new and old to diff_change()
2941 * also has the same effect.
2942 * Before the final output happens, they are pruned after
2943 * merged into rename/copy pairs as appropriate.
2944 */
2945 if (options->reverse_diff)
2946 addremove = (addremove == '+' ? '-' :
2947 addremove == '-' ? '+' : addremove);
2948
2949 if (!path) path = "";
2950 sprintf(concatpath, "%s%s", base, path);
2951 one = alloc_filespec(concatpath);
2952 two = alloc_filespec(concatpath);
2953
2954 if (addremove != '+')
2955 fill_filespec(one, sha1, mode);
2956 if (addremove != '-')
2957 fill_filespec(two, sha1, mode);
2958
2959 diff_queue(&diff_queued_diff, one, two);
2960 }
2961
2962 void diff_change(struct diff_options *options,
2963 unsigned old_mode, unsigned new_mode,
2964 const unsigned char *old_sha1,
2965 const unsigned char *new_sha1,
2966 const char *base, const char *path)
2967 {
2968 char concatpath[PATH_MAX];
2969 struct diff_filespec *one, *two;
2970
2971 if (options->reverse_diff) {
2972 unsigned tmp;
2973 const unsigned char *tmp_c;
2974 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
2975 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
2976 }
2977 if (!path) path = "";
2978 sprintf(concatpath, "%s%s", base, path);
2979 one = alloc_filespec(concatpath);
2980 two = alloc_filespec(concatpath);
2981 fill_filespec(one, old_sha1, old_mode);
2982 fill_filespec(two, new_sha1, new_mode);
2983
2984 diff_queue(&diff_queued_diff, one, two);
2985 }
2986
2987 void diff_unmerge(struct diff_options *options,
2988 const char *path,
2989 unsigned mode, const unsigned char *sha1)
2990 {
2991 struct diff_filespec *one, *two;
2992 one = alloc_filespec(path);
2993 two = alloc_filespec(path);
2994 fill_filespec(one, sha1, mode);
2995 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
2996 }
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