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diff: Support both attributes and colors
[git/jrn.git] / diff.c
blobf350c6ba910dfc5ac11aa75ba0af668237cd1f8e
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_detect_rename_default = 0;
17 static int diff_rename_limit_default = -1;
18 static int diff_use_color_default = 0;
19
20 enum color_diff {
21 DIFF_RESET = 0,
22 DIFF_PLAIN = 1,
23 DIFF_METAINFO = 2,
24 DIFF_FRAGINFO = 3,
25 DIFF_FILE_OLD = 4,
26 DIFF_FILE_NEW = 5,
27 };
28
29 /* "\033[1;30;47m\0" is 11 bytes */
30 static char diff_colors[][16] = {
31 "\033[m", /* reset */
32 "", /* normal */
33 "\033[1m", /* bold */
34 "\033[36m", /* cyan */
35 "\033[31m", /* red */
36 "\033[32m" /* green */
37 };
38
39 static int parse_diff_color_slot(const char *var, int ofs)
40 {
41 if (!strcasecmp(var+ofs, "plain"))
42 return DIFF_PLAIN;
43 if (!strcasecmp(var+ofs, "meta"))
44 return DIFF_METAINFO;
45 if (!strcasecmp(var+ofs, "frag"))
46 return DIFF_FRAGINFO;
47 if (!strcasecmp(var+ofs, "old"))
48 return DIFF_FILE_OLD;
49 if (!strcasecmp(var+ofs, "new"))
50 return DIFF_FILE_NEW;
51 die("bad config variable '%s'", var);
52 }
53
54 static int parse_color(const char *name, int len)
55 {
56 static const char * const color_names[] = {
57 "normal", "black", "red", "green", "yellow",
58 "blue", "magenta", "cyan", "white"
59 };
60 int i;
61 for (i = 0; i < ARRAY_SIZE(color_names); i++) {
62 const char *str = color_names[i];
63 if (!strncasecmp(name, str, len) && !str[len])
64 return i - 1;
65 }
66 return -2;
67 }
68
69 static int parse_attr(const char *name, int len)
70 {
71 static const int attr_values[] = { 1, 2, 4, 5, 7 };
72 static const char * const attr_names[] = {
73 "bold", "dim", "ul", "blink", "reverse"
74 };
75 int i;
76 for (i = 0; i < ARRAY_SIZE(attr_names); i++) {
77 const char *str = attr_names[i];
78 if (!strncasecmp(name, str, len) && !str[len])
79 return attr_values[i];
80 }
81 return -1;
82 }
83
84 static void parse_diff_color_value(const char *value, const char *var, char *dst)
85 {
86 const char *ptr = value;
87 int attr = -1;
88 int fg = -2;
89 int bg = -2;
90
91 if (!strcasecmp(value, "reset")) {
92 strcpy(dst, "\033[m");
93 return;
94 }
95
96 /* [fg [bg]] [attr] */
97 while (*ptr) {
98 const char *word = ptr;
99 int val, len = 0;
100
101 while (word[len] && !isspace(word[len]))
102 len++;
103
104 ptr = word + len;
105 while (*ptr && isspace(*ptr))
106 ptr++;
107
108 val = parse_color(word, len);
109 if (val >= -1) {
110 if (fg == -2) {
111 fg = val;
112 continue;
113 }
114 if (bg == -2) {
115 bg = val;
116 continue;
117 }
118 goto bad;
119 }
120 val = parse_attr(word, len);
121 if (val < 0 || attr != -1)
122 goto bad;
123 attr = val;
124 }
125
126 if (attr >= 0 || fg >= 0 || bg >= 0) {
127 int sep = 0;
128
129 *dst++ = '\033';
130 *dst++ = '[';
131 if (attr >= 0) {
132 *dst++ = '0' + attr;
133 sep++;
134 }
135 if (fg >= 0) {
136 if (sep++)
137 *dst++ = ';';
138 *dst++ = '3';
139 *dst++ = '0' + fg;
140 }
141 if (bg >= 0) {
142 if (sep++)
143 *dst++ = ';';
144 *dst++ = '4';
145 *dst++ = '0' + bg;
146 }
147 *dst++ = 'm';
148 }
149 *dst = 0;
150 return;
151 bad:
152 die("bad config value '%s' for variable '%s'", value, var);
153 }
154
155 /*
156 * These are to give UI layer defaults.
157 * The core-level commands such as git-diff-files should
158 * never be affected by the setting of diff.renames
159 * the user happens to have in the configuration file.
160 */
161 int git_diff_ui_config(const char *var, const char *value)
162 {
163 if (!strcmp(var, "diff.renamelimit")) {
164 diff_rename_limit_default = git_config_int(var, value);
165 return 0;
166 }
167 if (!strcmp(var, "diff.color")) {
168 if (!value)
169 diff_use_color_default = 1; /* bool */
170 else if (!strcasecmp(value, "auto")) {
171 diff_use_color_default = 0;
172 if (isatty(1) || pager_in_use) {
173 char *term = getenv("TERM");
174 if (term && strcmp(term, "dumb"))
175 diff_use_color_default = 1;
176 }
177 }
178 else if (!strcasecmp(value, "never"))
179 diff_use_color_default = 0;
180 else if (!strcasecmp(value, "always"))
181 diff_use_color_default = 1;
182 else
183 diff_use_color_default = git_config_bool(var, value);
184 return 0;
185 }
186 if (!strcmp(var, "diff.renames")) {
187 if (!value)
188 diff_detect_rename_default = DIFF_DETECT_RENAME;
189 else if (!strcasecmp(value, "copies") ||
190 !strcasecmp(value, "copy"))
191 diff_detect_rename_default = DIFF_DETECT_COPY;
192 else if (git_config_bool(var,value))
193 diff_detect_rename_default = DIFF_DETECT_RENAME;
194 return 0;
195 }
196 if (!strncmp(var, "diff.color.", 11)) {
197 int slot = parse_diff_color_slot(var, 11);
198 parse_diff_color_value(value, var, diff_colors[slot]);
199 return 0;
200 }
201 return git_default_config(var, value);
202 }
203
204 static char *quote_one(const char *str)
205 {
206 int needlen;
207 char *xp;
208
209 if (!str)
210 return NULL;
211 needlen = quote_c_style(str, NULL, NULL, 0);
212 if (!needlen)
213 return strdup(str);
214 xp = xmalloc(needlen + 1);
215 quote_c_style(str, xp, NULL, 0);
216 return xp;
217 }
218
219 static char *quote_two(const char *one, const char *two)
220 {
221 int need_one = quote_c_style(one, NULL, NULL, 1);
222 int need_two = quote_c_style(two, NULL, NULL, 1);
223 char *xp;
224
225 if (need_one + need_two) {
226 if (!need_one) need_one = strlen(one);
227 if (!need_two) need_one = strlen(two);
228
229 xp = xmalloc(need_one + need_two + 3);
230 xp[0] = '"';
231 quote_c_style(one, xp + 1, NULL, 1);
232 quote_c_style(two, xp + need_one + 1, NULL, 1);
233 strcpy(xp + need_one + need_two + 1, "\"");
234 return xp;
235 }
236 need_one = strlen(one);
237 need_two = strlen(two);
238 xp = xmalloc(need_one + need_two + 1);
239 strcpy(xp, one);
240 strcpy(xp + need_one, two);
241 return xp;
242 }
243
244 static const char *external_diff(void)
245 {
246 static const char *external_diff_cmd = NULL;
247 static int done_preparing = 0;
248
249 if (done_preparing)
250 return external_diff_cmd;
251 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
252 done_preparing = 1;
253 return external_diff_cmd;
254 }
255
256 #define TEMPFILE_PATH_LEN 50
257
258 static struct diff_tempfile {
259 const char *name; /* filename external diff should read from */
260 char hex[41];
261 char mode[10];
262 char tmp_path[TEMPFILE_PATH_LEN];
263 } diff_temp[2];
264
265 static int count_lines(const char *data, int size)
266 {
267 int count, ch, completely_empty = 1, nl_just_seen = 0;
268 count = 0;
269 while (0 < size--) {
270 ch = *data++;
271 if (ch == '\n') {
272 count++;
273 nl_just_seen = 1;
274 completely_empty = 0;
275 }
276 else {
277 nl_just_seen = 0;
278 completely_empty = 0;
279 }
280 }
281 if (completely_empty)
282 return 0;
283 if (!nl_just_seen)
284 count++; /* no trailing newline */
285 return count;
286 }
287
288 static void print_line_count(int count)
289 {
290 switch (count) {
291 case 0:
292 printf("0,0");
293 break;
294 case 1:
295 printf("1");
296 break;
297 default:
298 printf("1,%d", count);
299 break;
300 }
301 }
302
303 static void copy_file(int prefix, const char *data, int size)
304 {
305 int ch, nl_just_seen = 1;
306 while (0 < size--) {
307 ch = *data++;
308 if (nl_just_seen)
309 putchar(prefix);
310 putchar(ch);
311 if (ch == '\n')
312 nl_just_seen = 1;
313 else
314 nl_just_seen = 0;
315 }
316 if (!nl_just_seen)
317 printf("\n\\ No newline at end of file\n");
318 }
319
320 static void emit_rewrite_diff(const char *name_a,
321 const char *name_b,
322 struct diff_filespec *one,
323 struct diff_filespec *two)
324 {
325 int lc_a, lc_b;
326 diff_populate_filespec(one, 0);
327 diff_populate_filespec(two, 0);
328 lc_a = count_lines(one->data, one->size);
329 lc_b = count_lines(two->data, two->size);
330 printf("--- %s\n+++ %s\n@@ -", name_a, name_b);
331 print_line_count(lc_a);
332 printf(" +");
333 print_line_count(lc_b);
334 printf(" @@\n");
335 if (lc_a)
336 copy_file('-', one->data, one->size);
337 if (lc_b)
338 copy_file('+', two->data, two->size);
339 }
340
341 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
342 {
343 if (!DIFF_FILE_VALID(one)) {
344 mf->ptr = (char *)""; /* does not matter */
345 mf->size = 0;
346 return 0;
347 }
348 else if (diff_populate_filespec(one, 0))
349 return -1;
350 mf->ptr = one->data;
351 mf->size = one->size;
352 return 0;
353 }
354
355 struct emit_callback {
356 struct xdiff_emit_state xm;
357 int nparents, color_diff;
358 const char **label_path;
359 };
360
361 static inline const char *get_color(int diff_use_color, enum color_diff ix)
362 {
363 if (diff_use_color)
364 return diff_colors[ix];
365 return "";
366 }
367
368 static void fn_out_consume(void *priv, char *line, unsigned long len)
369 {
370 int i;
371 struct emit_callback *ecbdata = priv;
372 const char *set = get_color(ecbdata->color_diff, DIFF_METAINFO);
373 const char *reset = get_color(ecbdata->color_diff, DIFF_RESET);
374
375 if (ecbdata->label_path[0]) {
376 printf("%s--- %s%s\n", set, ecbdata->label_path[0], reset);
377 printf("%s+++ %s%s\n", set, ecbdata->label_path[1], reset);
378 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
379 }
380
381 /* This is not really necessary for now because
382 * this codepath only deals with two-way diffs.
383 */
384 for (i = 0; i < len && line[i] == '@'; i++)
385 ;
386 if (2 <= i && i < len && line[i] == ' ') {
387 ecbdata->nparents = i - 1;
388 set = get_color(ecbdata->color_diff, DIFF_FRAGINFO);
389 }
390 else if (len < ecbdata->nparents)
391 set = reset;
392 else {
393 int nparents = ecbdata->nparents;
394 int color = DIFF_PLAIN;
395 for (i = 0; i < nparents && len; i++) {
396 if (line[i] == '-')
397 color = DIFF_FILE_OLD;
398 else if (line[i] == '+')
399 color = DIFF_FILE_NEW;
400 }
401 set = get_color(ecbdata->color_diff, color);
402 }
403 if (len > 0 && line[len-1] == '\n')
404 len--;
405 fputs (set, stdout);
406 fwrite (line, len, 1, stdout);
407 puts (reset);
408 }
409
410 static char *pprint_rename(const char *a, const char *b)
411 {
412 const char *old = a;
413 const char *new = b;
414 char *name = NULL;
415 int pfx_length, sfx_length;
416 int len_a = strlen(a);
417 int len_b = strlen(b);
418
419 /* Find common prefix */
420 pfx_length = 0;
421 while (*old && *new && *old == *new) {
422 if (*old == '/')
423 pfx_length = old - a + 1;
424 old++;
425 new++;
426 }
427
428 /* Find common suffix */
429 old = a + len_a;
430 new = b + len_b;
431 sfx_length = 0;
432 while (a <= old && b <= new && *old == *new) {
433 if (*old == '/')
434 sfx_length = len_a - (old - a);
435 old--;
436 new--;
437 }
438
439 /*
440 * pfx{mid-a => mid-b}sfx
441 * {pfx-a => pfx-b}sfx
442 * pfx{sfx-a => sfx-b}
443 * name-a => name-b
444 */
445 if (pfx_length + sfx_length) {
446 int a_midlen = len_a - pfx_length - sfx_length;
447 int b_midlen = len_b - pfx_length - sfx_length;
448 if (a_midlen < 0) a_midlen = 0;
449 if (b_midlen < 0) b_midlen = 0;
450
451 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
452 sprintf(name, "%.*s{%.*s => %.*s}%s",
453 pfx_length, a,
454 a_midlen, a + pfx_length,
455 b_midlen, b + pfx_length,
456 a + len_a - sfx_length);
457 }
458 else {
459 name = xmalloc(len_a + len_b + 5);
460 sprintf(name, "%s => %s", a, b);
461 }
462 return name;
463 }
464
465 struct diffstat_t {
466 struct xdiff_emit_state xm;
467
468 int nr;
469 int alloc;
470 struct diffstat_file {
471 char *name;
472 unsigned is_unmerged:1;
473 unsigned is_binary:1;
474 unsigned is_renamed:1;
475 unsigned int added, deleted;
476 } **files;
477 };
478
479 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
480 const char *name_a,
481 const char *name_b)
482 {
483 struct diffstat_file *x;
484 x = xcalloc(sizeof (*x), 1);
485 if (diffstat->nr == diffstat->alloc) {
486 diffstat->alloc = alloc_nr(diffstat->alloc);
487 diffstat->files = xrealloc(diffstat->files,
488 diffstat->alloc * sizeof(x));
489 }
490 diffstat->files[diffstat->nr++] = x;
491 if (name_b) {
492 x->name = pprint_rename(name_a, name_b);
493 x->is_renamed = 1;
494 }
495 else
496 x->name = strdup(name_a);
497 return x;
498 }
499
500 static void diffstat_consume(void *priv, char *line, unsigned long len)
501 {
502 struct diffstat_t *diffstat = priv;
503 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
504
505 if (line[0] == '+')
506 x->added++;
507 else if (line[0] == '-')
508 x->deleted++;
509 }
510
511 static const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
512 static const char minuses[]= "----------------------------------------------------------------------";
513 const char mime_boundary_leader[] = "------------";
514
515 static void show_stats(struct diffstat_t* data)
516 {
517 int i, len, add, del, total, adds = 0, dels = 0;
518 int max, max_change = 0, max_len = 0;
519 int total_files = data->nr;
520
521 if (data->nr == 0)
522 return;
523
524 for (i = 0; i < data->nr; i++) {
525 struct diffstat_file *file = data->files[i];
526
527 len = strlen(file->name);
528 if (max_len < len)
529 max_len = len;
530
531 if (file->is_binary || file->is_unmerged)
532 continue;
533 if (max_change < file->added + file->deleted)
534 max_change = file->added + file->deleted;
535 }
536
537 for (i = 0; i < data->nr; i++) {
538 const char *prefix = "";
539 char *name = data->files[i]->name;
540 int added = data->files[i]->added;
541 int deleted = data->files[i]->deleted;
542
543 if (0 < (len = quote_c_style(name, NULL, NULL, 0))) {
544 char *qname = xmalloc(len + 1);
545 quote_c_style(name, qname, NULL, 0);
546 free(name);
547 data->files[i]->name = name = qname;
548 }
549
550 /*
551 * "scale" the filename
552 */
553 len = strlen(name);
554 max = max_len;
555 if (max > 50)
556 max = 50;
557 if (len > max) {
558 char *slash;
559 prefix = "...";
560 max -= 3;
561 name += len - max;
562 slash = strchr(name, '/');
563 if (slash)
564 name = slash;
565 }
566 len = max;
567
568 /*
569 * scale the add/delete
570 */
571 max = max_change;
572 if (max + len > 70)
573 max = 70 - len;
574
575 if (data->files[i]->is_binary) {
576 printf(" %s%-*s | Bin\n", prefix, len, name);
577 goto free_diffstat_file;
578 }
579 else if (data->files[i]->is_unmerged) {
580 printf(" %s%-*s | Unmerged\n", prefix, len, name);
581 goto free_diffstat_file;
582 }
583 else if (!data->files[i]->is_renamed &&
584 (added + deleted == 0)) {
585 total_files--;
586 goto free_diffstat_file;
587 }
588
589 add = added;
590 del = deleted;
591 total = add + del;
592 adds += add;
593 dels += del;
594
595 if (max_change > 0) {
596 total = (total * max + max_change / 2) / max_change;
597 add = (add * max + max_change / 2) / max_change;
598 del = total - add;
599 }
600 printf(" %s%-*s |%5d %.*s%.*s\n", prefix,
601 len, name, added + deleted,
602 add, pluses, del, minuses);
603 free_diffstat_file:
604 free(data->files[i]->name);
605 free(data->files[i]);
606 }
607 free(data->files);
608 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
609 total_files, adds, dels);
610 }
611
612 struct checkdiff_t {
613 struct xdiff_emit_state xm;
614 const char *filename;
615 int lineno;
616 };
617
618 static void checkdiff_consume(void *priv, char *line, unsigned long len)
619 {
620 struct checkdiff_t *data = priv;
621
622 if (line[0] == '+') {
623 int i, spaces = 0;
624
625 data->lineno++;
626
627 /* check space before tab */
628 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
629 if (line[i] == ' ')
630 spaces++;
631 if (line[i - 1] == '\t' && spaces)
632 printf("%s:%d: space before tab:%.*s\n",
633 data->filename, data->lineno, (int)len, line);
634
635 /* check white space at line end */
636 if (line[len - 1] == '\n')
637 len--;
638 if (isspace(line[len - 1]))
639 printf("%s:%d: white space at end: %.*s\n",
640 data->filename, data->lineno, (int)len, line);
641 } else if (line[0] == ' ')
642 data->lineno++;
643 else if (line[0] == '@') {
644 char *plus = strchr(line, '+');
645 if (plus)
646 data->lineno = strtol(plus, NULL, 10);
647 else
648 die("invalid diff");
649 }
650 }
651
652 static unsigned char *deflate_it(char *data,
653 unsigned long size,
654 unsigned long *result_size)
655 {
656 int bound;
657 unsigned char *deflated;
658 z_stream stream;
659
660 memset(&stream, 0, sizeof(stream));
661 deflateInit(&stream, zlib_compression_level);
662 bound = deflateBound(&stream, size);
663 deflated = xmalloc(bound);
664 stream.next_out = deflated;
665 stream.avail_out = bound;
666
667 stream.next_in = (unsigned char *)data;
668 stream.avail_in = size;
669 while (deflate(&stream, Z_FINISH) == Z_OK)
670 ; /* nothing */
671 deflateEnd(&stream);
672 *result_size = stream.total_out;
673 return deflated;
674 }
675
676 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
677 {
678 void *cp;
679 void *delta;
680 void *deflated;
681 void *data;
682 unsigned long orig_size;
683 unsigned long delta_size;
684 unsigned long deflate_size;
685 unsigned long data_size;
686
687 printf("GIT binary patch\n");
688 /* We could do deflated delta, or we could do just deflated two,
689 * whichever is smaller.
690 */
691 delta = NULL;
692 deflated = deflate_it(two->ptr, two->size, &deflate_size);
693 if (one->size && two->size) {
694 delta = diff_delta(one->ptr, one->size,
695 two->ptr, two->size,
696 &delta_size, deflate_size);
697 if (delta) {
698 void *to_free = delta;
699 orig_size = delta_size;
700 delta = deflate_it(delta, delta_size, &delta_size);
701 free(to_free);
702 }
703 }
704
705 if (delta && delta_size < deflate_size) {
706 printf("delta %lu\n", orig_size);
707 free(deflated);
708 data = delta;
709 data_size = delta_size;
710 }
711 else {
712 printf("literal %lu\n", two->size);
713 free(delta);
714 data = deflated;
715 data_size = deflate_size;
716 }
717
718 /* emit data encoded in base85 */
719 cp = data;
720 while (data_size) {
721 int bytes = (52 < data_size) ? 52 : data_size;
722 char line[70];
723 data_size -= bytes;
724 if (bytes <= 26)
725 line[0] = bytes + 'A' - 1;
726 else
727 line[0] = bytes - 26 + 'a' - 1;
728 encode_85(line + 1, cp, bytes);
729 cp = (char *) cp + bytes;
730 puts(line);
731 }
732 printf("\n");
733 free(data);
734 }
735
736 #define FIRST_FEW_BYTES 8000
737 static int mmfile_is_binary(mmfile_t *mf)
738 {
739 long sz = mf->size;
740 if (FIRST_FEW_BYTES < sz)
741 sz = FIRST_FEW_BYTES;
742 if (memchr(mf->ptr, 0, sz))
743 return 1;
744 return 0;
745 }
746
747 static void builtin_diff(const char *name_a,
748 const char *name_b,
749 struct diff_filespec *one,
750 struct diff_filespec *two,
751 const char *xfrm_msg,
752 struct diff_options *o,
753 int complete_rewrite)
754 {
755 mmfile_t mf1, mf2;
756 const char *lbl[2];
757 char *a_one, *b_two;
758 const char *set = get_color(o->color_diff, DIFF_METAINFO);
759 const char *reset = get_color(o->color_diff, DIFF_RESET);
760
761 a_one = quote_two("a/", name_a);
762 b_two = quote_two("b/", name_b);
763 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
764 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
765 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
766 if (lbl[0][0] == '/') {
767 /* /dev/null */
768 printf("%snew file mode %06o%s\n", set, two->mode, reset);
769 if (xfrm_msg && xfrm_msg[0])
770 printf("%s%s%s\n", set, xfrm_msg, reset);
771 }
772 else if (lbl[1][0] == '/') {
773 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
774 if (xfrm_msg && xfrm_msg[0])
775 printf("%s%s%s\n", set, xfrm_msg, reset);
776 }
777 else {
778 if (one->mode != two->mode) {
779 printf("%sold mode %06o%s\n", set, one->mode, reset);
780 printf("%snew mode %06o%s\n", set, two->mode, reset);
781 }
782 if (xfrm_msg && xfrm_msg[0])
783 printf("%s%s%s\n", set, xfrm_msg, reset);
784 /*
785 * we do not run diff between different kind
786 * of objects.
787 */
788 if ((one->mode ^ two->mode) & S_IFMT)
789 goto free_ab_and_return;
790 if (complete_rewrite) {
791 emit_rewrite_diff(name_a, name_b, one, two);
792 goto free_ab_and_return;
793 }
794 }
795
796 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
797 die("unable to read files to diff");
798
799 if (!o->text && (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))) {
800 /* Quite common confusing case */
801 if (mf1.size == mf2.size &&
802 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
803 goto free_ab_and_return;
804 if (o->binary)
805 emit_binary_diff(&mf1, &mf2);
806 else
807 printf("Binary files %s and %s differ\n",
808 lbl[0], lbl[1]);
809 }
810 else {
811 /* Crazy xdl interfaces.. */
812 const char *diffopts = getenv("GIT_DIFF_OPTS");
813 xpparam_t xpp;
814 xdemitconf_t xecfg;
815 xdemitcb_t ecb;
816 struct emit_callback ecbdata;
817
818 memset(&ecbdata, 0, sizeof(ecbdata));
819 ecbdata.label_path = lbl;
820 ecbdata.color_diff = o->color_diff;
821 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
822 xecfg.ctxlen = o->context;
823 xecfg.flags = XDL_EMIT_FUNCNAMES;
824 if (!diffopts)
825 ;
826 else if (!strncmp(diffopts, "--unified=", 10))
827 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
828 else if (!strncmp(diffopts, "-u", 2))
829 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
830 ecb.outf = xdiff_outf;
831 ecb.priv = &ecbdata;
832 ecbdata.xm.consume = fn_out_consume;
833 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
834 }
835
836 free_ab_and_return:
837 free(a_one);
838 free(b_two);
839 return;
840 }
841
842 static void builtin_diffstat(const char *name_a, const char *name_b,
843 struct diff_filespec *one,
844 struct diff_filespec *two,
845 struct diffstat_t *diffstat,
846 struct diff_options *o,
847 int complete_rewrite)
848 {
849 mmfile_t mf1, mf2;
850 struct diffstat_file *data;
851
852 data = diffstat_add(diffstat, name_a, name_b);
853
854 if (!one || !two) {
855 data->is_unmerged = 1;
856 return;
857 }
858 if (complete_rewrite) {
859 diff_populate_filespec(one, 0);
860 diff_populate_filespec(two, 0);
861 data->deleted = count_lines(one->data, one->size);
862 data->added = count_lines(two->data, two->size);
863 return;
864 }
865 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
866 die("unable to read files to diff");
867
868 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
869 data->is_binary = 1;
870 else {
871 /* Crazy xdl interfaces.. */
872 xpparam_t xpp;
873 xdemitconf_t xecfg;
874 xdemitcb_t ecb;
875
876 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
877 xecfg.ctxlen = 0;
878 xecfg.flags = 0;
879 ecb.outf = xdiff_outf;
880 ecb.priv = diffstat;
881 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
882 }
883 }
884
885 static void builtin_checkdiff(const char *name_a, const char *name_b,
886 struct diff_filespec *one,
887 struct diff_filespec *two)
888 {
889 mmfile_t mf1, mf2;
890 struct checkdiff_t data;
891
892 if (!two)
893 return;
894
895 memset(&data, 0, sizeof(data));
896 data.xm.consume = checkdiff_consume;
897 data.filename = name_b ? name_b : name_a;
898 data.lineno = 0;
899
900 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
901 die("unable to read files to diff");
902
903 if (mmfile_is_binary(&mf2))
904 return;
905 else {
906 /* Crazy xdl interfaces.. */
907 xpparam_t xpp;
908 xdemitconf_t xecfg;
909 xdemitcb_t ecb;
910
911 xpp.flags = XDF_NEED_MINIMAL;
912 xecfg.ctxlen = 0;
913 xecfg.flags = 0;
914 ecb.outf = xdiff_outf;
915 ecb.priv = &data;
916 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
917 }
918 }
919
920 struct diff_filespec *alloc_filespec(const char *path)
921 {
922 int namelen = strlen(path);
923 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
924
925 memset(spec, 0, sizeof(*spec));
926 spec->path = (char *)(spec + 1);
927 memcpy(spec->path, path, namelen+1);
928 return spec;
929 }
930
931 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
932 unsigned short mode)
933 {
934 if (mode) {
935 spec->mode = canon_mode(mode);
936 memcpy(spec->sha1, sha1, 20);
937 spec->sha1_valid = !!memcmp(sha1, null_sha1, 20);
938 }
939 }
940
941 /*
942 * Given a name and sha1 pair, if the dircache tells us the file in
943 * the work tree has that object contents, return true, so that
944 * prepare_temp_file() does not have to inflate and extract.
945 */
946 static int work_tree_matches(const char *name, const unsigned char *sha1)
947 {
948 struct cache_entry *ce;
949 struct stat st;
950 int pos, len;
951
952 /* We do not read the cache ourselves here, because the
953 * benchmark with my previous version that always reads cache
954 * shows that it makes things worse for diff-tree comparing
955 * two linux-2.6 kernel trees in an already checked out work
956 * tree. This is because most diff-tree comparisons deal with
957 * only a small number of files, while reading the cache is
958 * expensive for a large project, and its cost outweighs the
959 * savings we get by not inflating the object to a temporary
960 * file. Practically, this code only helps when we are used
961 * by diff-cache --cached, which does read the cache before
962 * calling us.
963 */
964 if (!active_cache)
965 return 0;
966
967 len = strlen(name);
968 pos = cache_name_pos(name, len);
969 if (pos < 0)
970 return 0;
971 ce = active_cache[pos];
972 if ((lstat(name, &st) < 0) ||
973 !S_ISREG(st.st_mode) || /* careful! */
974 ce_match_stat(ce, &st, 0) ||
975 memcmp(sha1, ce->sha1, 20))
976 return 0;
977 /* we return 1 only when we can stat, it is a regular file,
978 * stat information matches, and sha1 recorded in the cache
979 * matches. I.e. we know the file in the work tree really is
980 * the same as the <name, sha1> pair.
981 */
982 return 1;
983 }
984
985 static struct sha1_size_cache {
986 unsigned char sha1[20];
987 unsigned long size;
988 } **sha1_size_cache;
989 static int sha1_size_cache_nr, sha1_size_cache_alloc;
990
991 static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
992 int find_only,
993 unsigned long size)
994 {
995 int first, last;
996 struct sha1_size_cache *e;
997
998 first = 0;
999 last = sha1_size_cache_nr;
1000 while (last > first) {
1001 int cmp, next = (last + first) >> 1;
1002 e = sha1_size_cache[next];
1003 cmp = memcmp(e->sha1, sha1, 20);
1004 if (!cmp)
1005 return e;
1006 if (cmp < 0) {
1007 last = next;
1008 continue;
1009 }
1010 first = next+1;
1011 }
1012 /* not found */
1013 if (find_only)
1014 return NULL;
1015 /* insert to make it at "first" */
1016 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
1017 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
1018 sha1_size_cache = xrealloc(sha1_size_cache,
1019 sha1_size_cache_alloc *
1020 sizeof(*sha1_size_cache));
1021 }
1022 sha1_size_cache_nr++;
1023 if (first < sha1_size_cache_nr)
1024 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
1025 (sha1_size_cache_nr - first - 1) *
1026 sizeof(*sha1_size_cache));
1027 e = xmalloc(sizeof(struct sha1_size_cache));
1028 sha1_size_cache[first] = e;
1029 memcpy(e->sha1, sha1, 20);
1030 e->size = size;
1031 return e;
1032 }
1033
1034 /*
1035 * While doing rename detection and pickaxe operation, we may need to
1036 * grab the data for the blob (or file) for our own in-core comparison.
1037 * diff_filespec has data and size fields for this purpose.
1038 */
1039 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1040 {
1041 int err = 0;
1042 if (!DIFF_FILE_VALID(s))
1043 die("internal error: asking to populate invalid file.");
1044 if (S_ISDIR(s->mode))
1045 return -1;
1046
1047 if (!use_size_cache)
1048 size_only = 0;
1049
1050 if (s->data)
1051 return err;
1052 if (!s->sha1_valid ||
1053 work_tree_matches(s->path, s->sha1)) {
1054 struct stat st;
1055 int fd;
1056 if (lstat(s->path, &st) < 0) {
1057 if (errno == ENOENT) {
1058 err_empty:
1059 err = -1;
1060 empty:
1061 s->data = (char *)"";
1062 s->size = 0;
1063 return err;
1064 }
1065 }
1066 s->size = st.st_size;
1067 if (!s->size)
1068 goto empty;
1069 if (size_only)
1070 return 0;
1071 if (S_ISLNK(st.st_mode)) {
1072 int ret;
1073 s->data = xmalloc(s->size);
1074 s->should_free = 1;
1075 ret = readlink(s->path, s->data, s->size);
1076 if (ret < 0) {
1077 free(s->data);
1078 goto err_empty;
1079 }
1080 return 0;
1081 }
1082 fd = open(s->path, O_RDONLY);
1083 if (fd < 0)
1084 goto err_empty;
1085 s->data = mmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1086 close(fd);
1087 if (s->data == MAP_FAILED)
1088 goto err_empty;
1089 s->should_munmap = 1;
1090 }
1091 else {
1092 char type[20];
1093 struct sha1_size_cache *e;
1094
1095 if (size_only) {
1096 e = locate_size_cache(s->sha1, 1, 0);
1097 if (e) {
1098 s->size = e->size;
1099 return 0;
1100 }
1101 if (!sha1_object_info(s->sha1, type, &s->size))
1102 locate_size_cache(s->sha1, 0, s->size);
1103 }
1104 else {
1105 s->data = read_sha1_file(s->sha1, type, &s->size);
1106 s->should_free = 1;
1107 }
1108 }
1109 return 0;
1110 }
1111
1112 void diff_free_filespec_data(struct diff_filespec *s)
1113 {
1114 if (s->should_free)
1115 free(s->data);
1116 else if (s->should_munmap)
1117 munmap(s->data, s->size);
1118 s->should_free = s->should_munmap = 0;
1119 s->data = NULL;
1120 free(s->cnt_data);
1121 s->cnt_data = NULL;
1122 }
1123
1124 static void prep_temp_blob(struct diff_tempfile *temp,
1125 void *blob,
1126 unsigned long size,
1127 const unsigned char *sha1,
1128 int mode)
1129 {
1130 int fd;
1131
1132 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
1133 if (fd < 0)
1134 die("unable to create temp-file");
1135 if (write(fd, blob, size) != size)
1136 die("unable to write temp-file");
1137 close(fd);
1138 temp->name = temp->tmp_path;
1139 strcpy(temp->hex, sha1_to_hex(sha1));
1140 temp->hex[40] = 0;
1141 sprintf(temp->mode, "%06o", mode);
1142 }
1143
1144 static void prepare_temp_file(const char *name,
1145 struct diff_tempfile *temp,
1146 struct diff_filespec *one)
1147 {
1148 if (!DIFF_FILE_VALID(one)) {
1149 not_a_valid_file:
1150 /* A '-' entry produces this for file-2, and
1151 * a '+' entry produces this for file-1.
1152 */
1153 temp->name = "/dev/null";
1154 strcpy(temp->hex, ".");
1155 strcpy(temp->mode, ".");
1156 return;
1157 }
1158
1159 if (!one->sha1_valid ||
1160 work_tree_matches(name, one->sha1)) {
1161 struct stat st;
1162 if (lstat(name, &st) < 0) {
1163 if (errno == ENOENT)
1164 goto not_a_valid_file;
1165 die("stat(%s): %s", name, strerror(errno));
1166 }
1167 if (S_ISLNK(st.st_mode)) {
1168 int ret;
1169 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1170 if (sizeof(buf) <= st.st_size)
1171 die("symlink too long: %s", name);
1172 ret = readlink(name, buf, st.st_size);
1173 if (ret < 0)
1174 die("readlink(%s)", name);
1175 prep_temp_blob(temp, buf, st.st_size,
1176 (one->sha1_valid ?
1177 one->sha1 : null_sha1),
1178 (one->sha1_valid ?
1179 one->mode : S_IFLNK));
1180 }
1181 else {
1182 /* we can borrow from the file in the work tree */
1183 temp->name = name;
1184 if (!one->sha1_valid)
1185 strcpy(temp->hex, sha1_to_hex(null_sha1));
1186 else
1187 strcpy(temp->hex, sha1_to_hex(one->sha1));
1188 /* Even though we may sometimes borrow the
1189 * contents from the work tree, we always want
1190 * one->mode. mode is trustworthy even when
1191 * !(one->sha1_valid), as long as
1192 * DIFF_FILE_VALID(one).
1193 */
1194 sprintf(temp->mode, "%06o", one->mode);
1195 }
1196 return;
1197 }
1198 else {
1199 if (diff_populate_filespec(one, 0))
1200 die("cannot read data blob for %s", one->path);
1201 prep_temp_blob(temp, one->data, one->size,
1202 one->sha1, one->mode);
1203 }
1204 }
1205
1206 static void remove_tempfile(void)
1207 {
1208 int i;
1209
1210 for (i = 0; i < 2; i++)
1211 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1212 unlink(diff_temp[i].name);
1213 diff_temp[i].name = NULL;
1214 }
1215 }
1216
1217 static void remove_tempfile_on_signal(int signo)
1218 {
1219 remove_tempfile();
1220 signal(SIGINT, SIG_DFL);
1221 raise(signo);
1222 }
1223
1224 static int spawn_prog(const char *pgm, const char **arg)
1225 {
1226 pid_t pid;
1227 int status;
1228
1229 fflush(NULL);
1230 pid = fork();
1231 if (pid < 0)
1232 die("unable to fork");
1233 if (!pid) {
1234 execvp(pgm, (char *const*) arg);
1235 exit(255);
1236 }
1237
1238 while (waitpid(pid, &status, 0) < 0) {
1239 if (errno == EINTR)
1240 continue;
1241 return -1;
1242 }
1243
1244 /* Earlier we did not check the exit status because
1245 * diff exits non-zero if files are different, and
1246 * we are not interested in knowing that. It was a
1247 * mistake which made it harder to quit a diff-*
1248 * session that uses the git-apply-patch-script as
1249 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1250 * should also exit non-zero only when it wants to
1251 * abort the entire diff-* session.
1252 */
1253 if (WIFEXITED(status) && !WEXITSTATUS(status))
1254 return 0;
1255 return -1;
1256 }
1257
1258 /* An external diff command takes:
1259 *
1260 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1261 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1262 *
1263 */
1264 static void run_external_diff(const char *pgm,
1265 const char *name,
1266 const char *other,
1267 struct diff_filespec *one,
1268 struct diff_filespec *two,
1269 const char *xfrm_msg,
1270 int complete_rewrite)
1271 {
1272 const char *spawn_arg[10];
1273 struct diff_tempfile *temp = diff_temp;
1274 int retval;
1275 static int atexit_asked = 0;
1276 const char *othername;
1277 const char **arg = &spawn_arg[0];
1278
1279 othername = (other? other : name);
1280 if (one && two) {
1281 prepare_temp_file(name, &temp[0], one);
1282 prepare_temp_file(othername, &temp[1], two);
1283 if (! atexit_asked &&
1284 (temp[0].name == temp[0].tmp_path ||
1285 temp[1].name == temp[1].tmp_path)) {
1286 atexit_asked = 1;
1287 atexit(remove_tempfile);
1288 }
1289 signal(SIGINT, remove_tempfile_on_signal);
1290 }
1291
1292 if (one && two) {
1293 *arg++ = pgm;
1294 *arg++ = name;
1295 *arg++ = temp[0].name;
1296 *arg++ = temp[0].hex;
1297 *arg++ = temp[0].mode;
1298 *arg++ = temp[1].name;
1299 *arg++ = temp[1].hex;
1300 *arg++ = temp[1].mode;
1301 if (other) {
1302 *arg++ = other;
1303 *arg++ = xfrm_msg;
1304 }
1305 } else {
1306 *arg++ = pgm;
1307 *arg++ = name;
1308 }
1309 *arg = NULL;
1310 retval = spawn_prog(pgm, spawn_arg);
1311 remove_tempfile();
1312 if (retval) {
1313 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1314 exit(1);
1315 }
1316 }
1317
1318 static void run_diff_cmd(const char *pgm,
1319 const char *name,
1320 const char *other,
1321 struct diff_filespec *one,
1322 struct diff_filespec *two,
1323 const char *xfrm_msg,
1324 struct diff_options *o,
1325 int complete_rewrite)
1326 {
1327 if (pgm) {
1328 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1329 complete_rewrite);
1330 return;
1331 }
1332 if (one && two)
1333 builtin_diff(name, other ? other : name,
1334 one, two, xfrm_msg, o, complete_rewrite);
1335 else
1336 printf("* Unmerged path %s\n", name);
1337 }
1338
1339 static void diff_fill_sha1_info(struct diff_filespec *one)
1340 {
1341 if (DIFF_FILE_VALID(one)) {
1342 if (!one->sha1_valid) {
1343 struct stat st;
1344 if (lstat(one->path, &st) < 0)
1345 die("stat %s", one->path);
1346 if (index_path(one->sha1, one->path, &st, 0))
1347 die("cannot hash %s\n", one->path);
1348 }
1349 }
1350 else
1351 memset(one->sha1, 0, 20);
1352 }
1353
1354 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1355 {
1356 const char *pgm = external_diff();
1357 char msg[PATH_MAX*2+300], *xfrm_msg;
1358 struct diff_filespec *one;
1359 struct diff_filespec *two;
1360 const char *name;
1361 const char *other;
1362 char *name_munged, *other_munged;
1363 int complete_rewrite = 0;
1364 int len;
1365
1366 if (DIFF_PAIR_UNMERGED(p)) {
1367 /* unmerged */
1368 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1369 return;
1370 }
1371
1372 name = p->one->path;
1373 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1374 name_munged = quote_one(name);
1375 other_munged = quote_one(other);
1376 one = p->one; two = p->two;
1377
1378 diff_fill_sha1_info(one);
1379 diff_fill_sha1_info(two);
1380
1381 len = 0;
1382 switch (p->status) {
1383 case DIFF_STATUS_COPIED:
1384 len += snprintf(msg + len, sizeof(msg) - len,
1385 "similarity index %d%%\n"
1386 "copy from %s\n"
1387 "copy to %s\n",
1388 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1389 name_munged, other_munged);
1390 break;
1391 case DIFF_STATUS_RENAMED:
1392 len += snprintf(msg + len, sizeof(msg) - len,
1393 "similarity index %d%%\n"
1394 "rename from %s\n"
1395 "rename to %s\n",
1396 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1397 name_munged, other_munged);
1398 break;
1399 case DIFF_STATUS_MODIFIED:
1400 if (p->score) {
1401 len += snprintf(msg + len, sizeof(msg) - len,
1402 "dissimilarity index %d%%\n",
1403 (int)(0.5 + p->score *
1404 100.0/MAX_SCORE));
1405 complete_rewrite = 1;
1406 break;
1407 }
1408 /* fallthru */
1409 default:
1410 /* nothing */
1411 ;
1412 }
1413
1414 if (memcmp(one->sha1, two->sha1, 20)) {
1415 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1416
1417 len += snprintf(msg + len, sizeof(msg) - len,
1418 "index %.*s..%.*s",
1419 abbrev, sha1_to_hex(one->sha1),
1420 abbrev, sha1_to_hex(two->sha1));
1421 if (one->mode == two->mode)
1422 len += snprintf(msg + len, sizeof(msg) - len,
1423 " %06o", one->mode);
1424 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1425 }
1426
1427 if (len)
1428 msg[--len] = 0;
1429 xfrm_msg = len ? msg : NULL;
1430
1431 if (!pgm &&
1432 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1433 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1434 /* a filepair that changes between file and symlink
1435 * needs to be split into deletion and creation.
1436 */
1437 struct diff_filespec *null = alloc_filespec(two->path);
1438 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1439 free(null);
1440 null = alloc_filespec(one->path);
1441 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1442 free(null);
1443 }
1444 else
1445 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1446 complete_rewrite);
1447
1448 free(name_munged);
1449 free(other_munged);
1450 }
1451
1452 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1453 struct diffstat_t *diffstat)
1454 {
1455 const char *name;
1456 const char *other;
1457 int complete_rewrite = 0;
1458
1459 if (DIFF_PAIR_UNMERGED(p)) {
1460 /* unmerged */
1461 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1462 return;
1463 }
1464
1465 name = p->one->path;
1466 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1467
1468 diff_fill_sha1_info(p->one);
1469 diff_fill_sha1_info(p->two);
1470
1471 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1472 complete_rewrite = 1;
1473 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
1474 }
1475
1476 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1477 {
1478 const char *name;
1479 const char *other;
1480
1481 if (DIFF_PAIR_UNMERGED(p)) {
1482 /* unmerged */
1483 return;
1484 }
1485
1486 name = p->one->path;
1487 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1488
1489 diff_fill_sha1_info(p->one);
1490 diff_fill_sha1_info(p->two);
1491
1492 builtin_checkdiff(name, other, p->one, p->two);
1493 }
1494
1495 void diff_setup(struct diff_options *options)
1496 {
1497 memset(options, 0, sizeof(*options));
1498 options->line_termination = '\n';
1499 options->break_opt = -1;
1500 options->rename_limit = -1;
1501 options->context = 3;
1502 options->msg_sep = "";
1503
1504 options->change = diff_change;
1505 options->add_remove = diff_addremove;
1506 options->color_diff = diff_use_color_default;
1507 options->detect_rename = diff_detect_rename_default;
1508 }
1509
1510 int diff_setup_done(struct diff_options *options)
1511 {
1512 if ((options->find_copies_harder &&
1513 options->detect_rename != DIFF_DETECT_COPY) ||
1514 (0 <= options->rename_limit && !options->detect_rename))
1515 return -1;
1516
1517 if (options->output_format & (DIFF_FORMAT_NAME |
1518 DIFF_FORMAT_NAME_STATUS |
1519 DIFF_FORMAT_CHECKDIFF |
1520 DIFF_FORMAT_NO_OUTPUT))
1521 options->output_format &= ~(DIFF_FORMAT_RAW |
1522 DIFF_FORMAT_DIFFSTAT |
1523 DIFF_FORMAT_SUMMARY |
1524 DIFF_FORMAT_PATCH);
1525
1526 /*
1527 * These cases always need recursive; we do not drop caller-supplied
1528 * recursive bits for other formats here.
1529 */
1530 if (options->output_format & (DIFF_FORMAT_PATCH |
1531 DIFF_FORMAT_DIFFSTAT |
1532 DIFF_FORMAT_CHECKDIFF))
1533 options->recursive = 1;
1534 /*
1535 * Also pickaxe would not work very well if you do not say recursive
1536 */
1537 if (options->pickaxe)
1538 options->recursive = 1;
1539
1540 if (options->detect_rename && options->rename_limit < 0)
1541 options->rename_limit = diff_rename_limit_default;
1542 if (options->setup & DIFF_SETUP_USE_CACHE) {
1543 if (!active_cache)
1544 /* read-cache does not die even when it fails
1545 * so it is safe for us to do this here. Also
1546 * it does not smudge active_cache or active_nr
1547 * when it fails, so we do not have to worry about
1548 * cleaning it up ourselves either.
1549 */
1550 read_cache();
1551 }
1552 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
1553 use_size_cache = 1;
1554 if (options->abbrev <= 0 || 40 < options->abbrev)
1555 options->abbrev = 40; /* full */
1556
1557 return 0;
1558 }
1559
1560 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
1561 {
1562 char c, *eq;
1563 int len;
1564
1565 if (*arg != '-')
1566 return 0;
1567 c = *++arg;
1568 if (!c)
1569 return 0;
1570 if (c == arg_short) {
1571 c = *++arg;
1572 if (!c)
1573 return 1;
1574 if (val && isdigit(c)) {
1575 char *end;
1576 int n = strtoul(arg, &end, 10);
1577 if (*end)
1578 return 0;
1579 *val = n;
1580 return 1;
1581 }
1582 return 0;
1583 }
1584 if (c != '-')
1585 return 0;
1586 arg++;
1587 eq = strchr(arg, '=');
1588 if (eq)
1589 len = eq - arg;
1590 else
1591 len = strlen(arg);
1592 if (!len || strncmp(arg, arg_long, len))
1593 return 0;
1594 if (eq) {
1595 int n;
1596 char *end;
1597 if (!isdigit(*++eq))
1598 return 0;
1599 n = strtoul(eq, &end, 10);
1600 if (*end)
1601 return 0;
1602 *val = n;
1603 }
1604 return 1;
1605 }
1606
1607 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
1608 {
1609 const char *arg = av[0];
1610 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
1611 options->output_format |= DIFF_FORMAT_PATCH;
1612 else if (opt_arg(arg, 'U', "unified", &options->context))
1613 options->output_format |= DIFF_FORMAT_PATCH;
1614 else if (!strcmp(arg, "--raw"))
1615 options->output_format |= DIFF_FORMAT_RAW;
1616 else if (!strcmp(arg, "--patch-with-raw")) {
1617 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
1618 }
1619 else if (!strcmp(arg, "--stat"))
1620 options->output_format |= DIFF_FORMAT_DIFFSTAT;
1621 else if (!strcmp(arg, "--check"))
1622 options->output_format |= DIFF_FORMAT_CHECKDIFF;
1623 else if (!strcmp(arg, "--summary"))
1624 options->output_format |= DIFF_FORMAT_SUMMARY;
1625 else if (!strcmp(arg, "--patch-with-stat")) {
1626 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
1627 }
1628 else if (!strcmp(arg, "-z"))
1629 options->line_termination = 0;
1630 else if (!strncmp(arg, "-l", 2))
1631 options->rename_limit = strtoul(arg+2, NULL, 10);
1632 else if (!strcmp(arg, "--full-index"))
1633 options->full_index = 1;
1634 else if (!strcmp(arg, "--binary")) {
1635 options->output_format |= DIFF_FORMAT_PATCH;
1636 options->full_index = options->binary = 1;
1637 }
1638 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
1639 options->text = 1;
1640 }
1641 else if (!strcmp(arg, "--name-only"))
1642 options->output_format |= DIFF_FORMAT_NAME;
1643 else if (!strcmp(arg, "--name-status"))
1644 options->output_format |= DIFF_FORMAT_NAME_STATUS;
1645 else if (!strcmp(arg, "-R"))
1646 options->reverse_diff = 1;
1647 else if (!strncmp(arg, "-S", 2))
1648 options->pickaxe = arg + 2;
1649 else if (!strcmp(arg, "-s")) {
1650 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
1651 }
1652 else if (!strncmp(arg, "-O", 2))
1653 options->orderfile = arg + 2;
1654 else if (!strncmp(arg, "--diff-filter=", 14))
1655 options->filter = arg + 14;
1656 else if (!strcmp(arg, "--pickaxe-all"))
1657 options->pickaxe_opts = DIFF_PICKAXE_ALL;
1658 else if (!strcmp(arg, "--pickaxe-regex"))
1659 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
1660 else if (!strncmp(arg, "-B", 2)) {
1661 if ((options->break_opt =
1662 diff_scoreopt_parse(arg)) == -1)
1663 return -1;
1664 }
1665 else if (!strncmp(arg, "-M", 2)) {
1666 if ((options->rename_score =
1667 diff_scoreopt_parse(arg)) == -1)
1668 return -1;
1669 options->detect_rename = DIFF_DETECT_RENAME;
1670 }
1671 else if (!strncmp(arg, "-C", 2)) {
1672 if ((options->rename_score =
1673 diff_scoreopt_parse(arg)) == -1)
1674 return -1;
1675 options->detect_rename = DIFF_DETECT_COPY;
1676 }
1677 else if (!strcmp(arg, "--find-copies-harder"))
1678 options->find_copies_harder = 1;
1679 else if (!strcmp(arg, "--abbrev"))
1680 options->abbrev = DEFAULT_ABBREV;
1681 else if (!strncmp(arg, "--abbrev=", 9)) {
1682 options->abbrev = strtoul(arg + 9, NULL, 10);
1683 if (options->abbrev < MINIMUM_ABBREV)
1684 options->abbrev = MINIMUM_ABBREV;
1685 else if (40 < options->abbrev)
1686 options->abbrev = 40;
1687 }
1688 else if (!strcmp(arg, "--color"))
1689 options->color_diff = 1;
1690 else if (!strcmp(arg, "--no-color"))
1691 options->color_diff = 0;
1692 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
1693 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
1694 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
1695 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
1696 else if (!strcmp(arg, "--no-renames"))
1697 options->detect_rename = 0;
1698 else
1699 return 0;
1700 return 1;
1701 }
1702
1703 static int parse_num(const char **cp_p)
1704 {
1705 unsigned long num, scale;
1706 int ch, dot;
1707 const char *cp = *cp_p;
1708
1709 num = 0;
1710 scale = 1;
1711 dot = 0;
1712 for(;;) {
1713 ch = *cp;
1714 if ( !dot && ch == '.' ) {
1715 scale = 1;
1716 dot = 1;
1717 } else if ( ch == '%' ) {
1718 scale = dot ? scale*100 : 100;
1719 cp++; /* % is always at the end */
1720 break;
1721 } else if ( ch >= '0' && ch <= '9' ) {
1722 if ( scale < 100000 ) {
1723 scale *= 10;
1724 num = (num*10) + (ch-'0');
1725 }
1726 } else {
1727 break;
1728 }
1729 cp++;
1730 }
1731 *cp_p = cp;
1732
1733 /* user says num divided by scale and we say internally that
1734 * is MAX_SCORE * num / scale.
1735 */
1736 return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
1737 }
1738
1739 int diff_scoreopt_parse(const char *opt)
1740 {
1741 int opt1, opt2, cmd;
1742
1743 if (*opt++ != '-')
1744 return -1;
1745 cmd = *opt++;
1746 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
1747 return -1; /* that is not a -M, -C nor -B option */
1748
1749 opt1 = parse_num(&opt);
1750 if (cmd != 'B')
1751 opt2 = 0;
1752 else {
1753 if (*opt == 0)
1754 opt2 = 0;
1755 else if (*opt != '/')
1756 return -1; /* we expect -B80/99 or -B80 */
1757 else {
1758 opt++;
1759 opt2 = parse_num(&opt);
1760 }
1761 }
1762 if (*opt != 0)
1763 return -1;
1764 return opt1 | (opt2 << 16);
1765 }
1766
1767 struct diff_queue_struct diff_queued_diff;
1768
1769 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
1770 {
1771 if (queue->alloc <= queue->nr) {
1772 queue->alloc = alloc_nr(queue->alloc);
1773 queue->queue = xrealloc(queue->queue,
1774 sizeof(dp) * queue->alloc);
1775 }
1776 queue->queue[queue->nr++] = dp;
1777 }
1778
1779 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
1780 struct diff_filespec *one,
1781 struct diff_filespec *two)
1782 {
1783 struct diff_filepair *dp = xmalloc(sizeof(*dp));
1784 dp->one = one;
1785 dp->two = two;
1786 dp->score = 0;
1787 dp->status = 0;
1788 dp->source_stays = 0;
1789 dp->broken_pair = 0;
1790 if (queue)
1791 diff_q(queue, dp);
1792 return dp;
1793 }
1794
1795 void diff_free_filepair(struct diff_filepair *p)
1796 {
1797 diff_free_filespec_data(p->one);
1798 diff_free_filespec_data(p->two);
1799 free(p->one);
1800 free(p->two);
1801 free(p);
1802 }
1803
1804 /* This is different from find_unique_abbrev() in that
1805 * it stuffs the result with dots for alignment.
1806 */
1807 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
1808 {
1809 int abblen;
1810 const char *abbrev;
1811 if (len == 40)
1812 return sha1_to_hex(sha1);
1813
1814 abbrev = find_unique_abbrev(sha1, len);
1815 if (!abbrev)
1816 return sha1_to_hex(sha1);
1817 abblen = strlen(abbrev);
1818 if (abblen < 37) {
1819 static char hex[41];
1820 if (len < abblen && abblen <= len + 2)
1821 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
1822 else
1823 sprintf(hex, "%s...", abbrev);
1824 return hex;
1825 }
1826 return sha1_to_hex(sha1);
1827 }
1828
1829 static void diff_flush_raw(struct diff_filepair *p,
1830 struct diff_options *options)
1831 {
1832 int two_paths;
1833 char status[10];
1834 int abbrev = options->abbrev;
1835 const char *path_one, *path_two;
1836 int inter_name_termination = '\t';
1837 int line_termination = options->line_termination;
1838
1839 if (!line_termination)
1840 inter_name_termination = 0;
1841
1842 path_one = p->one->path;
1843 path_two = p->two->path;
1844 if (line_termination) {
1845 path_one = quote_one(path_one);
1846 path_two = quote_one(path_two);
1847 }
1848
1849 if (p->score)
1850 sprintf(status, "%c%03d", p->status,
1851 (int)(0.5 + p->score * 100.0/MAX_SCORE));
1852 else {
1853 status[0] = p->status;
1854 status[1] = 0;
1855 }
1856 switch (p->status) {
1857 case DIFF_STATUS_COPIED:
1858 case DIFF_STATUS_RENAMED:
1859 two_paths = 1;
1860 break;
1861 case DIFF_STATUS_ADDED:
1862 case DIFF_STATUS_DELETED:
1863 two_paths = 0;
1864 break;
1865 default:
1866 two_paths = 0;
1867 break;
1868 }
1869 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
1870 printf(":%06o %06o %s ",
1871 p->one->mode, p->two->mode,
1872 diff_unique_abbrev(p->one->sha1, abbrev));
1873 printf("%s ",
1874 diff_unique_abbrev(p->two->sha1, abbrev));
1875 }
1876 printf("%s%c%s", status, inter_name_termination, path_one);
1877 if (two_paths)
1878 printf("%c%s", inter_name_termination, path_two);
1879 putchar(line_termination);
1880 if (path_one != p->one->path)
1881 free((void*)path_one);
1882 if (path_two != p->two->path)
1883 free((void*)path_two);
1884 }
1885
1886 static void diff_flush_name(struct diff_filepair *p, int line_termination)
1887 {
1888 char *path = p->two->path;
1889
1890 if (line_termination)
1891 path = quote_one(p->two->path);
1892 printf("%s%c", path, line_termination);
1893 if (p->two->path != path)
1894 free(path);
1895 }
1896
1897 int diff_unmodified_pair(struct diff_filepair *p)
1898 {
1899 /* This function is written stricter than necessary to support
1900 * the currently implemented transformers, but the idea is to
1901 * let transformers to produce diff_filepairs any way they want,
1902 * and filter and clean them up here before producing the output.
1903 */
1904 struct diff_filespec *one, *two;
1905
1906 if (DIFF_PAIR_UNMERGED(p))
1907 return 0; /* unmerged is interesting */
1908
1909 one = p->one;
1910 two = p->two;
1911
1912 /* deletion, addition, mode or type change
1913 * and rename are all interesting.
1914 */
1915 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
1916 DIFF_PAIR_MODE_CHANGED(p) ||
1917 strcmp(one->path, two->path))
1918 return 0;
1919
1920 /* both are valid and point at the same path. that is, we are
1921 * dealing with a change.
1922 */
1923 if (one->sha1_valid && two->sha1_valid &&
1924 !memcmp(one->sha1, two->sha1, sizeof(one->sha1)))
1925 return 1; /* no change */
1926 if (!one->sha1_valid && !two->sha1_valid)
1927 return 1; /* both look at the same file on the filesystem. */
1928 return 0;
1929 }
1930
1931 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
1932 {
1933 if (diff_unmodified_pair(p))
1934 return;
1935
1936 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1937 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1938 return; /* no tree diffs in patch format */
1939
1940 run_diff(p, o);
1941 }
1942
1943 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
1944 struct diffstat_t *diffstat)
1945 {
1946 if (diff_unmodified_pair(p))
1947 return;
1948
1949 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1950 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1951 return; /* no tree diffs in patch format */
1952
1953 run_diffstat(p, o, diffstat);
1954 }
1955
1956 static void diff_flush_checkdiff(struct diff_filepair *p,
1957 struct diff_options *o)
1958 {
1959 if (diff_unmodified_pair(p))
1960 return;
1961
1962 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1963 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1964 return; /* no tree diffs in patch format */
1965
1966 run_checkdiff(p, o);
1967 }
1968
1969 int diff_queue_is_empty(void)
1970 {
1971 struct diff_queue_struct *q = &diff_queued_diff;
1972 int i;
1973 for (i = 0; i < q->nr; i++)
1974 if (!diff_unmodified_pair(q->queue[i]))
1975 return 0;
1976 return 1;
1977 }
1978
1979 #if DIFF_DEBUG
1980 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
1981 {
1982 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
1983 x, one ? one : "",
1984 s->path,
1985 DIFF_FILE_VALID(s) ? "valid" : "invalid",
1986 s->mode,
1987 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
1988 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
1989 x, one ? one : "",
1990 s->size, s->xfrm_flags);
1991 }
1992
1993 void diff_debug_filepair(const struct diff_filepair *p, int i)
1994 {
1995 diff_debug_filespec(p->one, i, "one");
1996 diff_debug_filespec(p->two, i, "two");
1997 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
1998 p->score, p->status ? p->status : '?',
1999 p->source_stays, p->broken_pair);
2000 }
2001
2002 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2003 {
2004 int i;
2005 if (msg)
2006 fprintf(stderr, "%s\n", msg);
2007 fprintf(stderr, "q->nr = %d\n", q->nr);
2008 for (i = 0; i < q->nr; i++) {
2009 struct diff_filepair *p = q->queue[i];
2010 diff_debug_filepair(p, i);
2011 }
2012 }
2013 #endif
2014
2015 static void diff_resolve_rename_copy(void)
2016 {
2017 int i, j;
2018 struct diff_filepair *p, *pp;
2019 struct diff_queue_struct *q = &diff_queued_diff;
2020
2021 diff_debug_queue("resolve-rename-copy", q);
2022
2023 for (i = 0; i < q->nr; i++) {
2024 p = q->queue[i];
2025 p->status = 0; /* undecided */
2026 if (DIFF_PAIR_UNMERGED(p))
2027 p->status = DIFF_STATUS_UNMERGED;
2028 else if (!DIFF_FILE_VALID(p->one))
2029 p->status = DIFF_STATUS_ADDED;
2030 else if (!DIFF_FILE_VALID(p->two))
2031 p->status = DIFF_STATUS_DELETED;
2032 else if (DIFF_PAIR_TYPE_CHANGED(p))
2033 p->status = DIFF_STATUS_TYPE_CHANGED;
2034
2035 /* from this point on, we are dealing with a pair
2036 * whose both sides are valid and of the same type, i.e.
2037 * either in-place edit or rename/copy edit.
2038 */
2039 else if (DIFF_PAIR_RENAME(p)) {
2040 if (p->source_stays) {
2041 p->status = DIFF_STATUS_COPIED;
2042 continue;
2043 }
2044 /* See if there is some other filepair that
2045 * copies from the same source as us. If so
2046 * we are a copy. Otherwise we are either a
2047 * copy if the path stays, or a rename if it
2048 * does not, but we already handled "stays" case.
2049 */
2050 for (j = i + 1; j < q->nr; j++) {
2051 pp = q->queue[j];
2052 if (strcmp(pp->one->path, p->one->path))
2053 continue; /* not us */
2054 if (!DIFF_PAIR_RENAME(pp))
2055 continue; /* not a rename/copy */
2056 /* pp is a rename/copy from the same source */
2057 p->status = DIFF_STATUS_COPIED;
2058 break;
2059 }
2060 if (!p->status)
2061 p->status = DIFF_STATUS_RENAMED;
2062 }
2063 else if (memcmp(p->one->sha1, p->two->sha1, 20) ||
2064 p->one->mode != p->two->mode)
2065 p->status = DIFF_STATUS_MODIFIED;
2066 else {
2067 /* This is a "no-change" entry and should not
2068 * happen anymore, but prepare for broken callers.
2069 */
2070 error("feeding unmodified %s to diffcore",
2071 p->one->path);
2072 p->status = DIFF_STATUS_UNKNOWN;
2073 }
2074 }
2075 diff_debug_queue("resolve-rename-copy done", q);
2076 }
2077
2078 static int check_pair_status(struct diff_filepair *p)
2079 {
2080 switch (p->status) {
2081 case DIFF_STATUS_UNKNOWN:
2082 return 0;
2083 case 0:
2084 die("internal error in diff-resolve-rename-copy");
2085 default:
2086 return 1;
2087 }
2088 }
2089
2090 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2091 {
2092 int fmt = opt->output_format;
2093
2094 if (fmt & DIFF_FORMAT_CHECKDIFF)
2095 diff_flush_checkdiff(p, opt);
2096 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2097 diff_flush_raw(p, opt);
2098 else if (fmt & DIFF_FORMAT_NAME)
2099 diff_flush_name(p, opt->line_termination);
2100 }
2101
2102 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2103 {
2104 if (fs->mode)
2105 printf(" %s mode %06o %s\n", newdelete, fs->mode, fs->path);
2106 else
2107 printf(" %s %s\n", newdelete, fs->path);
2108 }
2109
2110
2111 static void show_mode_change(struct diff_filepair *p, int show_name)
2112 {
2113 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2114 if (show_name)
2115 printf(" mode change %06o => %06o %s\n",
2116 p->one->mode, p->two->mode, p->two->path);
2117 else
2118 printf(" mode change %06o => %06o\n",
2119 p->one->mode, p->two->mode);
2120 }
2121 }
2122
2123 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2124 {
2125 const char *old, *new;
2126
2127 /* Find common prefix */
2128 old = p->one->path;
2129 new = p->two->path;
2130 while (1) {
2131 const char *slash_old, *slash_new;
2132 slash_old = strchr(old, '/');
2133 slash_new = strchr(new, '/');
2134 if (!slash_old ||
2135 !slash_new ||
2136 slash_old - old != slash_new - new ||
2137 memcmp(old, new, slash_new - new))
2138 break;
2139 old = slash_old + 1;
2140 new = slash_new + 1;
2141 }
2142 /* p->one->path thru old is the common prefix, and old and new
2143 * through the end of names are renames
2144 */
2145 if (old != p->one->path)
2146 printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
2147 (int)(old - p->one->path), p->one->path,
2148 old, new, (int)(0.5 + p->score * 100.0/MAX_SCORE));
2149 else
2150 printf(" %s %s => %s (%d%%)\n", renamecopy,
2151 p->one->path, p->two->path,
2152 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2153 show_mode_change(p, 0);
2154 }
2155
2156 static void diff_summary(struct diff_filepair *p)
2157 {
2158 switch(p->status) {
2159 case DIFF_STATUS_DELETED:
2160 show_file_mode_name("delete", p->one);
2161 break;
2162 case DIFF_STATUS_ADDED:
2163 show_file_mode_name("create", p->two);
2164 break;
2165 case DIFF_STATUS_COPIED:
2166 show_rename_copy("copy", p);
2167 break;
2168 case DIFF_STATUS_RENAMED:
2169 show_rename_copy("rename", p);
2170 break;
2171 default:
2172 if (p->score) {
2173 printf(" rewrite %s (%d%%)\n", p->two->path,
2174 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2175 show_mode_change(p, 0);
2176 } else show_mode_change(p, 1);
2177 break;
2178 }
2179 }
2180
2181 struct patch_id_t {
2182 struct xdiff_emit_state xm;
2183 SHA_CTX *ctx;
2184 int patchlen;
2185 };
2186
2187 static int remove_space(char *line, int len)
2188 {
2189 int i;
2190 char *dst = line;
2191 unsigned char c;
2192
2193 for (i = 0; i < len; i++)
2194 if (!isspace((c = line[i])))
2195 *dst++ = c;
2196
2197 return dst - line;
2198 }
2199
2200 static void patch_id_consume(void *priv, char *line, unsigned long len)
2201 {
2202 struct patch_id_t *data = priv;
2203 int new_len;
2204
2205 /* Ignore line numbers when computing the SHA1 of the patch */
2206 if (!strncmp(line, "@@ -", 4))
2207 return;
2208
2209 new_len = remove_space(line, len);
2210
2211 SHA1_Update(data->ctx, line, new_len);
2212 data->patchlen += new_len;
2213 }
2214
2215 /* returns 0 upon success, and writes result into sha1 */
2216 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2217 {
2218 struct diff_queue_struct *q = &diff_queued_diff;
2219 int i;
2220 SHA_CTX ctx;
2221 struct patch_id_t data;
2222 char buffer[PATH_MAX * 4 + 20];
2223
2224 SHA1_Init(&ctx);
2225 memset(&data, 0, sizeof(struct patch_id_t));
2226 data.ctx = &ctx;
2227 data.xm.consume = patch_id_consume;
2228
2229 for (i = 0; i < q->nr; i++) {
2230 xpparam_t xpp;
2231 xdemitconf_t xecfg;
2232 xdemitcb_t ecb;
2233 mmfile_t mf1, mf2;
2234 struct diff_filepair *p = q->queue[i];
2235 int len1, len2;
2236
2237 if (p->status == 0)
2238 return error("internal diff status error");
2239 if (p->status == DIFF_STATUS_UNKNOWN)
2240 continue;
2241 if (diff_unmodified_pair(p))
2242 continue;
2243 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2244 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2245 continue;
2246 if (DIFF_PAIR_UNMERGED(p))
2247 continue;
2248
2249 diff_fill_sha1_info(p->one);
2250 diff_fill_sha1_info(p->two);
2251 if (fill_mmfile(&mf1, p->one) < 0 ||
2252 fill_mmfile(&mf2, p->two) < 0)
2253 return error("unable to read files to diff");
2254
2255 /* Maybe hash p->two? into the patch id? */
2256 if (mmfile_is_binary(&mf2))
2257 continue;
2258
2259 len1 = remove_space(p->one->path, strlen(p->one->path));
2260 len2 = remove_space(p->two->path, strlen(p->two->path));
2261 if (p->one->mode == 0)
2262 len1 = snprintf(buffer, sizeof(buffer),
2263 "diff--gita/%.*sb/%.*s"
2264 "newfilemode%06o"
2265 "---/dev/null"
2266 "+++b/%.*s",
2267 len1, p->one->path,
2268 len2, p->two->path,
2269 p->two->mode,
2270 len2, p->two->path);
2271 else if (p->two->mode == 0)
2272 len1 = snprintf(buffer, sizeof(buffer),
2273 "diff--gita/%.*sb/%.*s"
2274 "deletedfilemode%06o"
2275 "---a/%.*s"
2276 "+++/dev/null",
2277 len1, p->one->path,
2278 len2, p->two->path,
2279 p->one->mode,
2280 len1, p->one->path);
2281 else
2282 len1 = snprintf(buffer, sizeof(buffer),
2283 "diff--gita/%.*sb/%.*s"
2284 "---a/%.*s"
2285 "+++b/%.*s",
2286 len1, p->one->path,
2287 len2, p->two->path,
2288 len1, p->one->path,
2289 len2, p->two->path);
2290 SHA1_Update(&ctx, buffer, len1);
2291
2292 xpp.flags = XDF_NEED_MINIMAL;
2293 xecfg.ctxlen = 3;
2294 xecfg.flags = XDL_EMIT_FUNCNAMES;
2295 ecb.outf = xdiff_outf;
2296 ecb.priv = &data;
2297 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2298 }
2299
2300 SHA1_Final(sha1, &ctx);
2301 return 0;
2302 }
2303
2304 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2305 {
2306 struct diff_queue_struct *q = &diff_queued_diff;
2307 int i;
2308 int result = diff_get_patch_id(options, sha1);
2309
2310 for (i = 0; i < q->nr; i++)
2311 diff_free_filepair(q->queue[i]);
2312
2313 free(q->queue);
2314 q->queue = NULL;
2315 q->nr = q->alloc = 0;
2316
2317 return result;
2318 }
2319
2320 static int is_summary_empty(const struct diff_queue_struct *q)
2321 {
2322 int i;
2323
2324 for (i = 0; i < q->nr; i++) {
2325 const struct diff_filepair *p = q->queue[i];
2326
2327 switch (p->status) {
2328 case DIFF_STATUS_DELETED:
2329 case DIFF_STATUS_ADDED:
2330 case DIFF_STATUS_COPIED:
2331 case DIFF_STATUS_RENAMED:
2332 return 0;
2333 default:
2334 if (p->score)
2335 return 0;
2336 if (p->one->mode && p->two->mode &&
2337 p->one->mode != p->two->mode)
2338 return 0;
2339 break;
2340 }
2341 }
2342 return 1;
2343 }
2344
2345 void diff_flush(struct diff_options *options)
2346 {
2347 struct diff_queue_struct *q = &diff_queued_diff;
2348 int i, output_format = options->output_format;
2349 int separator = 0;
2350
2351 /*
2352 * Order: raw, stat, summary, patch
2353 * or: name/name-status/checkdiff (other bits clear)
2354 */
2355 if (!q->nr)
2356 goto free_queue;
2357
2358 if (output_format & (DIFF_FORMAT_RAW |
2359 DIFF_FORMAT_NAME |
2360 DIFF_FORMAT_NAME_STATUS |
2361 DIFF_FORMAT_CHECKDIFF)) {
2362 for (i = 0; i < q->nr; i++) {
2363 struct diff_filepair *p = q->queue[i];
2364 if (check_pair_status(p))
2365 flush_one_pair(p, options);
2366 }
2367 separator++;
2368 }
2369
2370 if (output_format & DIFF_FORMAT_DIFFSTAT) {
2371 struct diffstat_t diffstat;
2372
2373 memset(&diffstat, 0, sizeof(struct diffstat_t));
2374 diffstat.xm.consume = diffstat_consume;
2375 for (i = 0; i < q->nr; i++) {
2376 struct diff_filepair *p = q->queue[i];
2377 if (check_pair_status(p))
2378 diff_flush_stat(p, options, &diffstat);
2379 }
2380 show_stats(&diffstat);
2381 separator++;
2382 }
2383
2384 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2385 for (i = 0; i < q->nr; i++)
2386 diff_summary(q->queue[i]);
2387 separator++;
2388 }
2389
2390 if (output_format & DIFF_FORMAT_PATCH) {
2391 if (separator) {
2392 if (options->stat_sep) {
2393 /* attach patch instead of inline */
2394 fputs(options->stat_sep, stdout);
2395 } else {
2396 putchar(options->line_termination);
2397 }
2398 }
2399
2400 for (i = 0; i < q->nr; i++) {
2401 struct diff_filepair *p = q->queue[i];
2402 if (check_pair_status(p))
2403 diff_flush_patch(p, options);
2404 }
2405 }
2406
2407 for (i = 0; i < q->nr; i++)
2408 diff_free_filepair(q->queue[i]);
2409 free_queue:
2410 free(q->queue);
2411 q->queue = NULL;
2412 q->nr = q->alloc = 0;
2413 }
2414
2415 static void diffcore_apply_filter(const char *filter)
2416 {
2417 int i;
2418 struct diff_queue_struct *q = &diff_queued_diff;
2419 struct diff_queue_struct outq;
2420 outq.queue = NULL;
2421 outq.nr = outq.alloc = 0;
2422
2423 if (!filter)
2424 return;
2425
2426 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2427 int found;
2428 for (i = found = 0; !found && i < q->nr; i++) {
2429 struct diff_filepair *p = q->queue[i];
2430 if (((p->status == DIFF_STATUS_MODIFIED) &&
2431 ((p->score &&
2432 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2433 (!p->score &&
2434 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2435 ((p->status != DIFF_STATUS_MODIFIED) &&
2436 strchr(filter, p->status)))
2437 found++;
2438 }
2439 if (found)
2440 return;
2441
2442 /* otherwise we will clear the whole queue
2443 * by copying the empty outq at the end of this
2444 * function, but first clear the current entries
2445 * in the queue.
2446 */
2447 for (i = 0; i < q->nr; i++)
2448 diff_free_filepair(q->queue[i]);
2449 }
2450 else {
2451 /* Only the matching ones */
2452 for (i = 0; i < q->nr; i++) {
2453 struct diff_filepair *p = q->queue[i];
2454
2455 if (((p->status == DIFF_STATUS_MODIFIED) &&
2456 ((p->score &&
2457 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2458 (!p->score &&
2459 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2460 ((p->status != DIFF_STATUS_MODIFIED) &&
2461 strchr(filter, p->status)))
2462 diff_q(&outq, p);
2463 else
2464 diff_free_filepair(p);
2465 }
2466 }
2467 free(q->queue);
2468 *q = outq;
2469 }
2470
2471 void diffcore_std(struct diff_options *options)
2472 {
2473 if (options->break_opt != -1)
2474 diffcore_break(options->break_opt);
2475 if (options->detect_rename)
2476 diffcore_rename(options);
2477 if (options->break_opt != -1)
2478 diffcore_merge_broken();
2479 if (options->pickaxe)
2480 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2481 if (options->orderfile)
2482 diffcore_order(options->orderfile);
2483 diff_resolve_rename_copy();
2484 diffcore_apply_filter(options->filter);
2485 }
2486
2487
2488 void diffcore_std_no_resolve(struct diff_options *options)
2489 {
2490 if (options->pickaxe)
2491 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2492 if (options->orderfile)
2493 diffcore_order(options->orderfile);
2494 diffcore_apply_filter(options->filter);
2495 }
2496
2497 void diff_addremove(struct diff_options *options,
2498 int addremove, unsigned mode,
2499 const unsigned char *sha1,
2500 const char *base, const char *path)
2501 {
2502 char concatpath[PATH_MAX];
2503 struct diff_filespec *one, *two;
2504
2505 /* This may look odd, but it is a preparation for
2506 * feeding "there are unchanged files which should
2507 * not produce diffs, but when you are doing copy
2508 * detection you would need them, so here they are"
2509 * entries to the diff-core. They will be prefixed
2510 * with something like '=' or '*' (I haven't decided
2511 * which but should not make any difference).
2512 * Feeding the same new and old to diff_change()
2513 * also has the same effect.
2514 * Before the final output happens, they are pruned after
2515 * merged into rename/copy pairs as appropriate.
2516 */
2517 if (options->reverse_diff)
2518 addremove = (addremove == '+' ? '-' :
2519 addremove == '-' ? '+' : addremove);
2520
2521 if (!path) path = "";
2522 sprintf(concatpath, "%s%s", base, path);
2523 one = alloc_filespec(concatpath);
2524 two = alloc_filespec(concatpath);
2525
2526 if (addremove != '+')
2527 fill_filespec(one, sha1, mode);
2528 if (addremove != '-')
2529 fill_filespec(two, sha1, mode);
2530
2531 diff_queue(&diff_queued_diff, one, two);
2532 }
2533
2534 void diff_change(struct diff_options *options,
2535 unsigned old_mode, unsigned new_mode,
2536 const unsigned char *old_sha1,
2537 const unsigned char *new_sha1,
2538 const char *base, const char *path)
2539 {
2540 char concatpath[PATH_MAX];
2541 struct diff_filespec *one, *two;
2542
2543 if (options->reverse_diff) {
2544 unsigned tmp;
2545 const unsigned char *tmp_c;
2546 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
2547 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
2548 }
2549 if (!path) path = "";
2550 sprintf(concatpath, "%s%s", base, path);
2551 one = alloc_filespec(concatpath);
2552 two = alloc_filespec(concatpath);
2553 fill_filespec(one, old_sha1, old_mode);
2554 fill_filespec(two, new_sha1, new_mode);
2555
2556 diff_queue(&diff_queued_diff, one, two);
2557 }
2558
2559 void diff_unmerge(struct diff_options *options,
2560 const char *path)
2561 {
2562 struct diff_filespec *one, *two;
2563 one = alloc_filespec(path);
2564 two = alloc_filespec(path);
2565 diff_queue(&diff_queued_diff, one, two);
2566 }
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