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