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autoconf: Add support for setting PYTHON_PATH or NO_PYTHON
[git/jnareb-git/bp-gitweb.git] / diff.c
blob607c357f5ad8ff07c69dec7c185d667db4e43397
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 /* "\033[1;38;5;2xx;48;5;2xxm\0" is 23 bytes */
21 static char diff_colors[][24] = {
22 "\033[m", /* reset */
23 "", /* normal */
24 "\033[1m", /* bold */
25 "\033[36m", /* cyan */
26 "\033[31m", /* red */
27 "\033[32m", /* green */
28 "\033[33m" /* yellow */
29 };
30
31 static int parse_diff_color_slot(const char *var, int ofs)
32 {
33 if (!strcasecmp(var+ofs, "plain"))
34 return DIFF_PLAIN;
35 if (!strcasecmp(var+ofs, "meta"))
36 return DIFF_METAINFO;
37 if (!strcasecmp(var+ofs, "frag"))
38 return DIFF_FRAGINFO;
39 if (!strcasecmp(var+ofs, "old"))
40 return DIFF_FILE_OLD;
41 if (!strcasecmp(var+ofs, "new"))
42 return DIFF_FILE_NEW;
43 if (!strcasecmp(var+ofs, "commit"))
44 return DIFF_COMMIT;
45 die("bad config variable '%s'", var);
46 }
47
48 static int parse_color(const char *name, int len)
49 {
50 static const char * const color_names[] = {
51 "normal", "black", "red", "green", "yellow",
52 "blue", "magenta", "cyan", "white"
53 };
54 char *end;
55 int i;
56 for (i = 0; i < ARRAY_SIZE(color_names); i++) {
57 const char *str = color_names[i];
58 if (!strncasecmp(name, str, len) && !str[len])
59 return i - 1;
60 }
61 i = strtol(name, &end, 10);
62 if (*name && !*end && i >= -1 && i <= 255)
63 return i;
64 return -2;
65 }
66
67 static int parse_attr(const char *name, int len)
68 {
69 static const int attr_values[] = { 1, 2, 4, 5, 7 };
70 static const char * const attr_names[] = {
71 "bold", "dim", "ul", "blink", "reverse"
72 };
73 int i;
74 for (i = 0; i < ARRAY_SIZE(attr_names); i++) {
75 const char *str = attr_names[i];
76 if (!strncasecmp(name, str, len) && !str[len])
77 return attr_values[i];
78 }
79 return -1;
80 }
81
82 static void parse_diff_color_value(const char *value, const char *var, char *dst)
83 {
84 const char *ptr = value;
85 int attr = -1;
86 int fg = -2;
87 int bg = -2;
88
89 if (!strcasecmp(value, "reset")) {
90 strcpy(dst, "\033[m");
91 return;
92 }
93
94 /* [fg [bg]] [attr] */
95 while (*ptr) {
96 const char *word = ptr;
97 int val, len = 0;
98
99 while (word[len] && !isspace(word[len]))
100 len++;
101
102 ptr = word + len;
103 while (*ptr && isspace(*ptr))
104 ptr++;
105
106 val = parse_color(word, len);
107 if (val >= -1) {
108 if (fg == -2) {
109 fg = val;
110 continue;
111 }
112 if (bg == -2) {
113 bg = val;
114 continue;
115 }
116 goto bad;
117 }
118 val = parse_attr(word, len);
119 if (val < 0 || attr != -1)
120 goto bad;
121 attr = val;
122 }
123
124 if (attr >= 0 || fg >= 0 || bg >= 0) {
125 int sep = 0;
126
127 *dst++ = '\033';
128 *dst++ = '[';
129 if (attr >= 0) {
130 *dst++ = '0' + attr;
131 sep++;
132 }
133 if (fg >= 0) {
134 if (sep++)
135 *dst++ = ';';
136 if (fg < 8) {
137 *dst++ = '3';
138 *dst++ = '0' + fg;
139 } else {
140 dst += sprintf(dst, "38;5;%d", fg);
141 }
142 }
143 if (bg >= 0) {
144 if (sep++)
145 *dst++ = ';';
146 if (bg < 8) {
147 *dst++ = '4';
148 *dst++ = '0' + bg;
149 } else {
150 dst += sprintf(dst, "48;5;%d", bg);
151 }
152 }
153 *dst++ = 'm';
154 }
155 *dst = 0;
156 return;
157 bad:
158 die("bad config value '%s' for variable '%s'", value, var);
159 }
160
161 /*
162 * These are to give UI layer defaults.
163 * The core-level commands such as git-diff-files should
164 * never be affected by the setting of diff.renames
165 * the user happens to have in the configuration file.
166 */
167 int git_diff_ui_config(const char *var, const char *value)
168 {
169 if (!strcmp(var, "diff.renamelimit")) {
170 diff_rename_limit_default = git_config_int(var, value);
171 return 0;
172 }
173 if (!strcmp(var, "diff.color")) {
174 if (!value)
175 diff_use_color_default = 1; /* bool */
176 else if (!strcasecmp(value, "auto")) {
177 diff_use_color_default = 0;
178 if (isatty(1) || (pager_in_use && pager_use_color)) {
179 char *term = getenv("TERM");
180 if (term && strcmp(term, "dumb"))
181 diff_use_color_default = 1;
182 }
183 }
184 else if (!strcasecmp(value, "never"))
185 diff_use_color_default = 0;
186 else if (!strcasecmp(value, "always"))
187 diff_use_color_default = 1;
188 else
189 diff_use_color_default = git_config_bool(var, value);
190 return 0;
191 }
192 if (!strcmp(var, "diff.renames")) {
193 if (!value)
194 diff_detect_rename_default = DIFF_DETECT_RENAME;
195 else if (!strcasecmp(value, "copies") ||
196 !strcasecmp(value, "copy"))
197 diff_detect_rename_default = DIFF_DETECT_COPY;
198 else if (git_config_bool(var,value))
199 diff_detect_rename_default = DIFF_DETECT_RENAME;
200 return 0;
201 }
202 if (!strncmp(var, "diff.color.", 11)) {
203 int slot = parse_diff_color_slot(var, 11);
204 parse_diff_color_value(value, var, diff_colors[slot]);
205 return 0;
206 }
207 return git_default_config(var, value);
208 }
209
210 static char *quote_one(const char *str)
211 {
212 int needlen;
213 char *xp;
214
215 if (!str)
216 return NULL;
217 needlen = quote_c_style(str, NULL, NULL, 0);
218 if (!needlen)
219 return strdup(str);
220 xp = xmalloc(needlen + 1);
221 quote_c_style(str, xp, NULL, 0);
222 return xp;
223 }
224
225 static char *quote_two(const char *one, const char *two)
226 {
227 int need_one = quote_c_style(one, NULL, NULL, 1);
228 int need_two = quote_c_style(two, NULL, NULL, 1);
229 char *xp;
230
231 if (need_one + need_two) {
232 if (!need_one) need_one = strlen(one);
233 if (!need_two) need_one = strlen(two);
234
235 xp = xmalloc(need_one + need_two + 3);
236 xp[0] = '"';
237 quote_c_style(one, xp + 1, NULL, 1);
238 quote_c_style(two, xp + need_one + 1, NULL, 1);
239 strcpy(xp + need_one + need_two + 1, "\"");
240 return xp;
241 }
242 need_one = strlen(one);
243 need_two = strlen(two);
244 xp = xmalloc(need_one + need_two + 1);
245 strcpy(xp, one);
246 strcpy(xp + need_one, two);
247 return xp;
248 }
249
250 static const char *external_diff(void)
251 {
252 static const char *external_diff_cmd = NULL;
253 static int done_preparing = 0;
254
255 if (done_preparing)
256 return external_diff_cmd;
257 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
258 done_preparing = 1;
259 return external_diff_cmd;
260 }
261
262 #define TEMPFILE_PATH_LEN 50
263
264 static struct diff_tempfile {
265 const char *name; /* filename external diff should read from */
266 char hex[41];
267 char mode[10];
268 char tmp_path[TEMPFILE_PATH_LEN];
269 } diff_temp[2];
270
271 static int count_lines(const char *data, int size)
272 {
273 int count, ch, completely_empty = 1, nl_just_seen = 0;
274 count = 0;
275 while (0 < size--) {
276 ch = *data++;
277 if (ch == '\n') {
278 count++;
279 nl_just_seen = 1;
280 completely_empty = 0;
281 }
282 else {
283 nl_just_seen = 0;
284 completely_empty = 0;
285 }
286 }
287 if (completely_empty)
288 return 0;
289 if (!nl_just_seen)
290 count++; /* no trailing newline */
291 return count;
292 }
293
294 static void print_line_count(int count)
295 {
296 switch (count) {
297 case 0:
298 printf("0,0");
299 break;
300 case 1:
301 printf("1");
302 break;
303 default:
304 printf("1,%d", count);
305 break;
306 }
307 }
308
309 static void copy_file(int prefix, const char *data, int size)
310 {
311 int ch, nl_just_seen = 1;
312 while (0 < size--) {
313 ch = *data++;
314 if (nl_just_seen)
315 putchar(prefix);
316 putchar(ch);
317 if (ch == '\n')
318 nl_just_seen = 1;
319 else
320 nl_just_seen = 0;
321 }
322 if (!nl_just_seen)
323 printf("\n\\ No newline at end of file\n");
324 }
325
326 static void emit_rewrite_diff(const char *name_a,
327 const char *name_b,
328 struct diff_filespec *one,
329 struct diff_filespec *two)
330 {
331 int lc_a, lc_b;
332 diff_populate_filespec(one, 0);
333 diff_populate_filespec(two, 0);
334 lc_a = count_lines(one->data, one->size);
335 lc_b = count_lines(two->data, two->size);
336 printf("--- %s\n+++ %s\n@@ -", name_a, name_b);
337 print_line_count(lc_a);
338 printf(" +");
339 print_line_count(lc_b);
340 printf(" @@\n");
341 if (lc_a)
342 copy_file('-', one->data, one->size);
343 if (lc_b)
344 copy_file('+', two->data, two->size);
345 }
346
347 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
348 {
349 if (!DIFF_FILE_VALID(one)) {
350 mf->ptr = (char *)""; /* does not matter */
351 mf->size = 0;
352 return 0;
353 }
354 else if (diff_populate_filespec(one, 0))
355 return -1;
356 mf->ptr = one->data;
357 mf->size = one->size;
358 return 0;
359 }
360
361 struct emit_callback {
362 struct xdiff_emit_state xm;
363 int nparents, color_diff;
364 const char **label_path;
365 };
366
367 const char *diff_get_color(int diff_use_color, enum color_diff ix)
368 {
369 if (diff_use_color)
370 return diff_colors[ix];
371 return "";
372 }
373
374 static void fn_out_consume(void *priv, char *line, unsigned long len)
375 {
376 int i;
377 struct emit_callback *ecbdata = priv;
378 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
379 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
380
381 if (ecbdata->label_path[0]) {
382 printf("%s--- %s%s\n", set, ecbdata->label_path[0], reset);
383 printf("%s+++ %s%s\n", set, ecbdata->label_path[1], reset);
384 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
385 }
386
387 /* This is not really necessary for now because
388 * this codepath only deals with two-way diffs.
389 */
390 for (i = 0; i < len && line[i] == '@'; i++)
391 ;
392 if (2 <= i && i < len && line[i] == ' ') {
393 ecbdata->nparents = i - 1;
394 set = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
395 }
396 else if (len < ecbdata->nparents)
397 set = reset;
398 else {
399 int nparents = ecbdata->nparents;
400 int color = DIFF_PLAIN;
401 for (i = 0; i < nparents && len; i++) {
402 if (line[i] == '-')
403 color = DIFF_FILE_OLD;
404 else if (line[i] == '+')
405 color = DIFF_FILE_NEW;
406 }
407 set = diff_get_color(ecbdata->color_diff, color);
408 }
409 if (len > 0 && line[len-1] == '\n')
410 len--;
411 fputs (set, stdout);
412 fwrite (line, len, 1, stdout);
413 puts (reset);
414 }
415
416 static char *pprint_rename(const char *a, const char *b)
417 {
418 const char *old = a;
419 const char *new = b;
420 char *name = NULL;
421 int pfx_length, sfx_length;
422 int len_a = strlen(a);
423 int len_b = strlen(b);
424
425 /* Find common prefix */
426 pfx_length = 0;
427 while (*old && *new && *old == *new) {
428 if (*old == '/')
429 pfx_length = old - a + 1;
430 old++;
431 new++;
432 }
433
434 /* Find common suffix */
435 old = a + len_a;
436 new = b + len_b;
437 sfx_length = 0;
438 while (a <= old && b <= new && *old == *new) {
439 if (*old == '/')
440 sfx_length = len_a - (old - a);
441 old--;
442 new--;
443 }
444
445 /*
446 * pfx{mid-a => mid-b}sfx
447 * {pfx-a => pfx-b}sfx
448 * pfx{sfx-a => sfx-b}
449 * name-a => name-b
450 */
451 if (pfx_length + sfx_length) {
452 int a_midlen = len_a - pfx_length - sfx_length;
453 int b_midlen = len_b - pfx_length - sfx_length;
454 if (a_midlen < 0) a_midlen = 0;
455 if (b_midlen < 0) b_midlen = 0;
456
457 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
458 sprintf(name, "%.*s{%.*s => %.*s}%s",
459 pfx_length, a,
460 a_midlen, a + pfx_length,
461 b_midlen, b + pfx_length,
462 a + len_a - sfx_length);
463 }
464 else {
465 name = xmalloc(len_a + len_b + 5);
466 sprintf(name, "%s => %s", a, b);
467 }
468 return name;
469 }
470
471 struct diffstat_t {
472 struct xdiff_emit_state xm;
473
474 int nr;
475 int alloc;
476 struct diffstat_file {
477 char *name;
478 unsigned is_unmerged:1;
479 unsigned is_binary:1;
480 unsigned is_renamed:1;
481 unsigned int added, deleted;
482 } **files;
483 };
484
485 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
486 const char *name_a,
487 const char *name_b)
488 {
489 struct diffstat_file *x;
490 x = xcalloc(sizeof (*x), 1);
491 if (diffstat->nr == diffstat->alloc) {
492 diffstat->alloc = alloc_nr(diffstat->alloc);
493 diffstat->files = xrealloc(diffstat->files,
494 diffstat->alloc * sizeof(x));
495 }
496 diffstat->files[diffstat->nr++] = x;
497 if (name_b) {
498 x->name = pprint_rename(name_a, name_b);
499 x->is_renamed = 1;
500 }
501 else
502 x->name = strdup(name_a);
503 return x;
504 }
505
506 static void diffstat_consume(void *priv, char *line, unsigned long len)
507 {
508 struct diffstat_t *diffstat = priv;
509 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
510
511 if (line[0] == '+')
512 x->added++;
513 else if (line[0] == '-')
514 x->deleted++;
515 }
516
517 static const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
518 static const char minuses[]= "----------------------------------------------------------------------";
519 const char mime_boundary_leader[] = "------------";
520
521 static void show_stats(struct diffstat_t* data)
522 {
523 int i, len, add, del, total, adds = 0, dels = 0;
524 int max, max_change = 0, max_len = 0;
525 int total_files = data->nr;
526
527 if (data->nr == 0)
528 return;
529
530 for (i = 0; i < data->nr; i++) {
531 struct diffstat_file *file = data->files[i];
532
533 len = strlen(file->name);
534 if (max_len < len)
535 max_len = len;
536
537 if (file->is_binary || file->is_unmerged)
538 continue;
539 if (max_change < file->added + file->deleted)
540 max_change = file->added + file->deleted;
541 }
542
543 for (i = 0; i < data->nr; i++) {
544 const char *prefix = "";
545 char *name = data->files[i]->name;
546 int added = data->files[i]->added;
547 int deleted = data->files[i]->deleted;
548
549 if (0 < (len = quote_c_style(name, NULL, NULL, 0))) {
550 char *qname = xmalloc(len + 1);
551 quote_c_style(name, qname, NULL, 0);
552 free(name);
553 data->files[i]->name = name = qname;
554 }
555
556 /*
557 * "scale" the filename
558 */
559 len = strlen(name);
560 max = max_len;
561 if (max > 50)
562 max = 50;
563 if (len > max) {
564 char *slash;
565 prefix = "...";
566 max -= 3;
567 name += len - max;
568 slash = strchr(name, '/');
569 if (slash)
570 name = slash;
571 }
572 len = max;
573
574 /*
575 * scale the add/delete
576 */
577 max = max_change;
578 if (max + len > 70)
579 max = 70 - len;
580
581 if (data->files[i]->is_binary) {
582 printf(" %s%-*s | Bin\n", prefix, len, name);
583 goto free_diffstat_file;
584 }
585 else if (data->files[i]->is_unmerged) {
586 printf(" %s%-*s | Unmerged\n", prefix, len, name);
587 goto free_diffstat_file;
588 }
589 else if (!data->files[i]->is_renamed &&
590 (added + deleted == 0)) {
591 total_files--;
592 goto free_diffstat_file;
593 }
594
595 add = added;
596 del = deleted;
597 total = add + del;
598 adds += add;
599 dels += del;
600
601 if (max_change > 0) {
602 total = (total * max + max_change / 2) / max_change;
603 add = (add * max + max_change / 2) / max_change;
604 del = total - add;
605 }
606 printf(" %s%-*s |%5d %.*s%.*s\n", prefix,
607 len, name, added + deleted,
608 add, pluses, del, minuses);
609 free_diffstat_file:
610 free(data->files[i]->name);
611 free(data->files[i]);
612 }
613 free(data->files);
614 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
615 total_files, adds, dels);
616 }
617
618 struct checkdiff_t {
619 struct xdiff_emit_state xm;
620 const char *filename;
621 int lineno;
622 };
623
624 static void checkdiff_consume(void *priv, char *line, unsigned long len)
625 {
626 struct checkdiff_t *data = priv;
627
628 if (line[0] == '+') {
629 int i, spaces = 0;
630
631 data->lineno++;
632
633 /* check space before tab */
634 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
635 if (line[i] == ' ')
636 spaces++;
637 if (line[i - 1] == '\t' && spaces)
638 printf("%s:%d: space before tab:%.*s\n",
639 data->filename, data->lineno, (int)len, line);
640
641 /* check white space at line end */
642 if (line[len - 1] == '\n')
643 len--;
644 if (isspace(line[len - 1]))
645 printf("%s:%d: white space at end: %.*s\n",
646 data->filename, data->lineno, (int)len, line);
647 } else if (line[0] == ' ')
648 data->lineno++;
649 else if (line[0] == '@') {
650 char *plus = strchr(line, '+');
651 if (plus)
652 data->lineno = strtol(plus, NULL, 10);
653 else
654 die("invalid diff");
655 }
656 }
657
658 static unsigned char *deflate_it(char *data,
659 unsigned long size,
660 unsigned long *result_size)
661 {
662 int bound;
663 unsigned char *deflated;
664 z_stream stream;
665
666 memset(&stream, 0, sizeof(stream));
667 deflateInit(&stream, zlib_compression_level);
668 bound = deflateBound(&stream, size);
669 deflated = xmalloc(bound);
670 stream.next_out = deflated;
671 stream.avail_out = bound;
672
673 stream.next_in = (unsigned char *)data;
674 stream.avail_in = size;
675 while (deflate(&stream, Z_FINISH) == Z_OK)
676 ; /* nothing */
677 deflateEnd(&stream);
678 *result_size = stream.total_out;
679 return deflated;
680 }
681
682 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
683 {
684 void *cp;
685 void *delta;
686 void *deflated;
687 void *data;
688 unsigned long orig_size;
689 unsigned long delta_size;
690 unsigned long deflate_size;
691 unsigned long data_size;
692
693 printf("GIT binary patch\n");
694 /* We could do deflated delta, or we could do just deflated two,
695 * whichever is smaller.
696 */
697 delta = NULL;
698 deflated = deflate_it(two->ptr, two->size, &deflate_size);
699 if (one->size && two->size) {
700 delta = diff_delta(one->ptr, one->size,
701 two->ptr, two->size,
702 &delta_size, deflate_size);
703 if (delta) {
704 void *to_free = delta;
705 orig_size = delta_size;
706 delta = deflate_it(delta, delta_size, &delta_size);
707 free(to_free);
708 }
709 }
710
711 if (delta && delta_size < deflate_size) {
712 printf("delta %lu\n", orig_size);
713 free(deflated);
714 data = delta;
715 data_size = delta_size;
716 }
717 else {
718 printf("literal %lu\n", two->size);
719 free(delta);
720 data = deflated;
721 data_size = deflate_size;
722 }
723
724 /* emit data encoded in base85 */
725 cp = data;
726 while (data_size) {
727 int bytes = (52 < data_size) ? 52 : data_size;
728 char line[70];
729 data_size -= bytes;
730 if (bytes <= 26)
731 line[0] = bytes + 'A' - 1;
732 else
733 line[0] = bytes - 26 + 'a' - 1;
734 encode_85(line + 1, cp, bytes);
735 cp = (char *) cp + bytes;
736 puts(line);
737 }
738 printf("\n");
739 free(data);
740 }
741
742 #define FIRST_FEW_BYTES 8000
743 static int mmfile_is_binary(mmfile_t *mf)
744 {
745 long sz = mf->size;
746 if (FIRST_FEW_BYTES < sz)
747 sz = FIRST_FEW_BYTES;
748 if (memchr(mf->ptr, 0, sz))
749 return 1;
750 return 0;
751 }
752
753 static void builtin_diff(const char *name_a,
754 const char *name_b,
755 struct diff_filespec *one,
756 struct diff_filespec *two,
757 const char *xfrm_msg,
758 struct diff_options *o,
759 int complete_rewrite)
760 {
761 mmfile_t mf1, mf2;
762 const char *lbl[2];
763 char *a_one, *b_two;
764 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
765 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
766
767 a_one = quote_two("a/", name_a);
768 b_two = quote_two("b/", name_b);
769 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
770 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
771 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
772 if (lbl[0][0] == '/') {
773 /* /dev/null */
774 printf("%snew file mode %06o%s\n", set, two->mode, reset);
775 if (xfrm_msg && xfrm_msg[0])
776 printf("%s%s%s\n", set, xfrm_msg, reset);
777 }
778 else if (lbl[1][0] == '/') {
779 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
780 if (xfrm_msg && xfrm_msg[0])
781 printf("%s%s%s\n", set, xfrm_msg, reset);
782 }
783 else {
784 if (one->mode != two->mode) {
785 printf("%sold mode %06o%s\n", set, one->mode, reset);
786 printf("%snew mode %06o%s\n", set, two->mode, reset);
787 }
788 if (xfrm_msg && xfrm_msg[0])
789 printf("%s%s%s\n", set, xfrm_msg, reset);
790 /*
791 * we do not run diff between different kind
792 * of objects.
793 */
794 if ((one->mode ^ two->mode) & S_IFMT)
795 goto free_ab_and_return;
796 if (complete_rewrite) {
797 emit_rewrite_diff(name_a, name_b, one, two);
798 goto free_ab_and_return;
799 }
800 }
801
802 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
803 die("unable to read files to diff");
804
805 if (!o->text && (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))) {
806 /* Quite common confusing case */
807 if (mf1.size == mf2.size &&
808 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
809 goto free_ab_and_return;
810 if (o->binary)
811 emit_binary_diff(&mf1, &mf2);
812 else
813 printf("Binary files %s and %s differ\n",
814 lbl[0], lbl[1]);
815 }
816 else {
817 /* Crazy xdl interfaces.. */
818 const char *diffopts = getenv("GIT_DIFF_OPTS");
819 xpparam_t xpp;
820 xdemitconf_t xecfg;
821 xdemitcb_t ecb;
822 struct emit_callback ecbdata;
823
824 memset(&ecbdata, 0, sizeof(ecbdata));
825 ecbdata.label_path = lbl;
826 ecbdata.color_diff = o->color_diff;
827 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
828 xecfg.ctxlen = o->context;
829 xecfg.flags = XDL_EMIT_FUNCNAMES;
830 if (!diffopts)
831 ;
832 else if (!strncmp(diffopts, "--unified=", 10))
833 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
834 else if (!strncmp(diffopts, "-u", 2))
835 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
836 ecb.outf = xdiff_outf;
837 ecb.priv = &ecbdata;
838 ecbdata.xm.consume = fn_out_consume;
839 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
840 }
841
842 free_ab_and_return:
843 free(a_one);
844 free(b_two);
845 return;
846 }
847
848 static void builtin_diffstat(const char *name_a, const char *name_b,
849 struct diff_filespec *one,
850 struct diff_filespec *two,
851 struct diffstat_t *diffstat,
852 struct diff_options *o,
853 int complete_rewrite)
854 {
855 mmfile_t mf1, mf2;
856 struct diffstat_file *data;
857
858 data = diffstat_add(diffstat, name_a, name_b);
859
860 if (!one || !two) {
861 data->is_unmerged = 1;
862 return;
863 }
864 if (complete_rewrite) {
865 diff_populate_filespec(one, 0);
866 diff_populate_filespec(two, 0);
867 data->deleted = count_lines(one->data, one->size);
868 data->added = count_lines(two->data, two->size);
869 return;
870 }
871 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
872 die("unable to read files to diff");
873
874 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
875 data->is_binary = 1;
876 else {
877 /* Crazy xdl interfaces.. */
878 xpparam_t xpp;
879 xdemitconf_t xecfg;
880 xdemitcb_t ecb;
881
882 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
883 xecfg.ctxlen = 0;
884 xecfg.flags = 0;
885 ecb.outf = xdiff_outf;
886 ecb.priv = diffstat;
887 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
888 }
889 }
890
891 static void builtin_checkdiff(const char *name_a, const char *name_b,
892 struct diff_filespec *one,
893 struct diff_filespec *two)
894 {
895 mmfile_t mf1, mf2;
896 struct checkdiff_t data;
897
898 if (!two)
899 return;
900
901 memset(&data, 0, sizeof(data));
902 data.xm.consume = checkdiff_consume;
903 data.filename = name_b ? name_b : name_a;
904 data.lineno = 0;
905
906 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
907 die("unable to read files to diff");
908
909 if (mmfile_is_binary(&mf2))
910 return;
911 else {
912 /* Crazy xdl interfaces.. */
913 xpparam_t xpp;
914 xdemitconf_t xecfg;
915 xdemitcb_t ecb;
916
917 xpp.flags = XDF_NEED_MINIMAL;
918 xecfg.ctxlen = 0;
919 xecfg.flags = 0;
920 ecb.outf = xdiff_outf;
921 ecb.priv = &data;
922 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
923 }
924 }
925
926 struct diff_filespec *alloc_filespec(const char *path)
927 {
928 int namelen = strlen(path);
929 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
930
931 memset(spec, 0, sizeof(*spec));
932 spec->path = (char *)(spec + 1);
933 memcpy(spec->path, path, namelen+1);
934 return spec;
935 }
936
937 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
938 unsigned short mode)
939 {
940 if (mode) {
941 spec->mode = canon_mode(mode);
942 memcpy(spec->sha1, sha1, 20);
943 spec->sha1_valid = !!memcmp(sha1, null_sha1, 20);
944 }
945 }
946
947 /*
948 * Given a name and sha1 pair, if the dircache tells us the file in
949 * the work tree has that object contents, return true, so that
950 * prepare_temp_file() does not have to inflate and extract.
951 */
952 static int work_tree_matches(const char *name, const unsigned char *sha1)
953 {
954 struct cache_entry *ce;
955 struct stat st;
956 int pos, len;
957
958 /* We do not read the cache ourselves here, because the
959 * benchmark with my previous version that always reads cache
960 * shows that it makes things worse for diff-tree comparing
961 * two linux-2.6 kernel trees in an already checked out work
962 * tree. This is because most diff-tree comparisons deal with
963 * only a small number of files, while reading the cache is
964 * expensive for a large project, and its cost outweighs the
965 * savings we get by not inflating the object to a temporary
966 * file. Practically, this code only helps when we are used
967 * by diff-cache --cached, which does read the cache before
968 * calling us.
969 */
970 if (!active_cache)
971 return 0;
972
973 len = strlen(name);
974 pos = cache_name_pos(name, len);
975 if (pos < 0)
976 return 0;
977 ce = active_cache[pos];
978 if ((lstat(name, &st) < 0) ||
979 !S_ISREG(st.st_mode) || /* careful! */
980 ce_match_stat(ce, &st, 0) ||
981 memcmp(sha1, ce->sha1, 20))
982 return 0;
983 /* we return 1 only when we can stat, it is a regular file,
984 * stat information matches, and sha1 recorded in the cache
985 * matches. I.e. we know the file in the work tree really is
986 * the same as the <name, sha1> pair.
987 */
988 return 1;
989 }
990
991 static struct sha1_size_cache {
992 unsigned char sha1[20];
993 unsigned long size;
994 } **sha1_size_cache;
995 static int sha1_size_cache_nr, sha1_size_cache_alloc;
996
997 static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
998 int find_only,
999 unsigned long size)
1000 {
1001 int first, last;
1002 struct sha1_size_cache *e;
1003
1004 first = 0;
1005 last = sha1_size_cache_nr;
1006 while (last > first) {
1007 int cmp, next = (last + first) >> 1;
1008 e = sha1_size_cache[next];
1009 cmp = memcmp(e->sha1, sha1, 20);
1010 if (!cmp)
1011 return e;
1012 if (cmp < 0) {
1013 last = next;
1014 continue;
1015 }
1016 first = next+1;
1017 }
1018 /* not found */
1019 if (find_only)
1020 return NULL;
1021 /* insert to make it at "first" */
1022 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
1023 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
1024 sha1_size_cache = xrealloc(sha1_size_cache,
1025 sha1_size_cache_alloc *
1026 sizeof(*sha1_size_cache));
1027 }
1028 sha1_size_cache_nr++;
1029 if (first < sha1_size_cache_nr)
1030 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
1031 (sha1_size_cache_nr - first - 1) *
1032 sizeof(*sha1_size_cache));
1033 e = xmalloc(sizeof(struct sha1_size_cache));
1034 sha1_size_cache[first] = e;
1035 memcpy(e->sha1, sha1, 20);
1036 e->size = size;
1037 return e;
1038 }
1039
1040 /*
1041 * While doing rename detection and pickaxe operation, we may need to
1042 * grab the data for the blob (or file) for our own in-core comparison.
1043 * diff_filespec has data and size fields for this purpose.
1044 */
1045 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1046 {
1047 int err = 0;
1048 if (!DIFF_FILE_VALID(s))
1049 die("internal error: asking to populate invalid file.");
1050 if (S_ISDIR(s->mode))
1051 return -1;
1052
1053 if (!use_size_cache)
1054 size_only = 0;
1055
1056 if (s->data)
1057 return err;
1058 if (!s->sha1_valid ||
1059 work_tree_matches(s->path, s->sha1)) {
1060 struct stat st;
1061 int fd;
1062 if (lstat(s->path, &st) < 0) {
1063 if (errno == ENOENT) {
1064 err_empty:
1065 err = -1;
1066 empty:
1067 s->data = (char *)"";
1068 s->size = 0;
1069 return err;
1070 }
1071 }
1072 s->size = st.st_size;
1073 if (!s->size)
1074 goto empty;
1075 if (size_only)
1076 return 0;
1077 if (S_ISLNK(st.st_mode)) {
1078 int ret;
1079 s->data = xmalloc(s->size);
1080 s->should_free = 1;
1081 ret = readlink(s->path, s->data, s->size);
1082 if (ret < 0) {
1083 free(s->data);
1084 goto err_empty;
1085 }
1086 return 0;
1087 }
1088 fd = open(s->path, O_RDONLY);
1089 if (fd < 0)
1090 goto err_empty;
1091 s->data = mmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1092 close(fd);
1093 if (s->data == MAP_FAILED)
1094 goto err_empty;
1095 s->should_munmap = 1;
1096 }
1097 else {
1098 char type[20];
1099 struct sha1_size_cache *e;
1100
1101 if (size_only) {
1102 e = locate_size_cache(s->sha1, 1, 0);
1103 if (e) {
1104 s->size = e->size;
1105 return 0;
1106 }
1107 if (!sha1_object_info(s->sha1, type, &s->size))
1108 locate_size_cache(s->sha1, 0, s->size);
1109 }
1110 else {
1111 s->data = read_sha1_file(s->sha1, type, &s->size);
1112 s->should_free = 1;
1113 }
1114 }
1115 return 0;
1116 }
1117
1118 void diff_free_filespec_data(struct diff_filespec *s)
1119 {
1120 if (s->should_free)
1121 free(s->data);
1122 else if (s->should_munmap)
1123 munmap(s->data, s->size);
1124 s->should_free = s->should_munmap = 0;
1125 s->data = NULL;
1126 free(s->cnt_data);
1127 s->cnt_data = NULL;
1128 }
1129
1130 static void prep_temp_blob(struct diff_tempfile *temp,
1131 void *blob,
1132 unsigned long size,
1133 const unsigned char *sha1,
1134 int mode)
1135 {
1136 int fd;
1137
1138 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
1139 if (fd < 0)
1140 die("unable to create temp-file");
1141 if (write(fd, blob, size) != size)
1142 die("unable to write temp-file");
1143 close(fd);
1144 temp->name = temp->tmp_path;
1145 strcpy(temp->hex, sha1_to_hex(sha1));
1146 temp->hex[40] = 0;
1147 sprintf(temp->mode, "%06o", mode);
1148 }
1149
1150 static void prepare_temp_file(const char *name,
1151 struct diff_tempfile *temp,
1152 struct diff_filespec *one)
1153 {
1154 if (!DIFF_FILE_VALID(one)) {
1155 not_a_valid_file:
1156 /* A '-' entry produces this for file-2, and
1157 * a '+' entry produces this for file-1.
1158 */
1159 temp->name = "/dev/null";
1160 strcpy(temp->hex, ".");
1161 strcpy(temp->mode, ".");
1162 return;
1163 }
1164
1165 if (!one->sha1_valid ||
1166 work_tree_matches(name, one->sha1)) {
1167 struct stat st;
1168 if (lstat(name, &st) < 0) {
1169 if (errno == ENOENT)
1170 goto not_a_valid_file;
1171 die("stat(%s): %s", name, strerror(errno));
1172 }
1173 if (S_ISLNK(st.st_mode)) {
1174 int ret;
1175 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1176 if (sizeof(buf) <= st.st_size)
1177 die("symlink too long: %s", name);
1178 ret = readlink(name, buf, st.st_size);
1179 if (ret < 0)
1180 die("readlink(%s)", name);
1181 prep_temp_blob(temp, buf, st.st_size,
1182 (one->sha1_valid ?
1183 one->sha1 : null_sha1),
1184 (one->sha1_valid ?
1185 one->mode : S_IFLNK));
1186 }
1187 else {
1188 /* we can borrow from the file in the work tree */
1189 temp->name = name;
1190 if (!one->sha1_valid)
1191 strcpy(temp->hex, sha1_to_hex(null_sha1));
1192 else
1193 strcpy(temp->hex, sha1_to_hex(one->sha1));
1194 /* Even though we may sometimes borrow the
1195 * contents from the work tree, we always want
1196 * one->mode. mode is trustworthy even when
1197 * !(one->sha1_valid), as long as
1198 * DIFF_FILE_VALID(one).
1199 */
1200 sprintf(temp->mode, "%06o", one->mode);
1201 }
1202 return;
1203 }
1204 else {
1205 if (diff_populate_filespec(one, 0))
1206 die("cannot read data blob for %s", one->path);
1207 prep_temp_blob(temp, one->data, one->size,
1208 one->sha1, one->mode);
1209 }
1210 }
1211
1212 static void remove_tempfile(void)
1213 {
1214 int i;
1215
1216 for (i = 0; i < 2; i++)
1217 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1218 unlink(diff_temp[i].name);
1219 diff_temp[i].name = NULL;
1220 }
1221 }
1222
1223 static void remove_tempfile_on_signal(int signo)
1224 {
1225 remove_tempfile();
1226 signal(SIGINT, SIG_DFL);
1227 raise(signo);
1228 }
1229
1230 static int spawn_prog(const char *pgm, const char **arg)
1231 {
1232 pid_t pid;
1233 int status;
1234
1235 fflush(NULL);
1236 pid = fork();
1237 if (pid < 0)
1238 die("unable to fork");
1239 if (!pid) {
1240 execvp(pgm, (char *const*) arg);
1241 exit(255);
1242 }
1243
1244 while (waitpid(pid, &status, 0) < 0) {
1245 if (errno == EINTR)
1246 continue;
1247 return -1;
1248 }
1249
1250 /* Earlier we did not check the exit status because
1251 * diff exits non-zero if files are different, and
1252 * we are not interested in knowing that. It was a
1253 * mistake which made it harder to quit a diff-*
1254 * session that uses the git-apply-patch-script as
1255 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1256 * should also exit non-zero only when it wants to
1257 * abort the entire diff-* session.
1258 */
1259 if (WIFEXITED(status) && !WEXITSTATUS(status))
1260 return 0;
1261 return -1;
1262 }
1263
1264 /* An external diff command takes:
1265 *
1266 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1267 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1268 *
1269 */
1270 static void run_external_diff(const char *pgm,
1271 const char *name,
1272 const char *other,
1273 struct diff_filespec *one,
1274 struct diff_filespec *two,
1275 const char *xfrm_msg,
1276 int complete_rewrite)
1277 {
1278 const char *spawn_arg[10];
1279 struct diff_tempfile *temp = diff_temp;
1280 int retval;
1281 static int atexit_asked = 0;
1282 const char *othername;
1283 const char **arg = &spawn_arg[0];
1284
1285 othername = (other? other : name);
1286 if (one && two) {
1287 prepare_temp_file(name, &temp[0], one);
1288 prepare_temp_file(othername, &temp[1], two);
1289 if (! atexit_asked &&
1290 (temp[0].name == temp[0].tmp_path ||
1291 temp[1].name == temp[1].tmp_path)) {
1292 atexit_asked = 1;
1293 atexit(remove_tempfile);
1294 }
1295 signal(SIGINT, remove_tempfile_on_signal);
1296 }
1297
1298 if (one && two) {
1299 *arg++ = pgm;
1300 *arg++ = name;
1301 *arg++ = temp[0].name;
1302 *arg++ = temp[0].hex;
1303 *arg++ = temp[0].mode;
1304 *arg++ = temp[1].name;
1305 *arg++ = temp[1].hex;
1306 *arg++ = temp[1].mode;
1307 if (other) {
1308 *arg++ = other;
1309 *arg++ = xfrm_msg;
1310 }
1311 } else {
1312 *arg++ = pgm;
1313 *arg++ = name;
1314 }
1315 *arg = NULL;
1316 retval = spawn_prog(pgm, spawn_arg);
1317 remove_tempfile();
1318 if (retval) {
1319 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1320 exit(1);
1321 }
1322 }
1323
1324 static void run_diff_cmd(const char *pgm,
1325 const char *name,
1326 const char *other,
1327 struct diff_filespec *one,
1328 struct diff_filespec *two,
1329 const char *xfrm_msg,
1330 struct diff_options *o,
1331 int complete_rewrite)
1332 {
1333 if (pgm) {
1334 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1335 complete_rewrite);
1336 return;
1337 }
1338 if (one && two)
1339 builtin_diff(name, other ? other : name,
1340 one, two, xfrm_msg, o, complete_rewrite);
1341 else
1342 printf("* Unmerged path %s\n", name);
1343 }
1344
1345 static void diff_fill_sha1_info(struct diff_filespec *one)
1346 {
1347 if (DIFF_FILE_VALID(one)) {
1348 if (!one->sha1_valid) {
1349 struct stat st;
1350 if (lstat(one->path, &st) < 0)
1351 die("stat %s", one->path);
1352 if (index_path(one->sha1, one->path, &st, 0))
1353 die("cannot hash %s\n", one->path);
1354 }
1355 }
1356 else
1357 memset(one->sha1, 0, 20);
1358 }
1359
1360 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1361 {
1362 const char *pgm = external_diff();
1363 char msg[PATH_MAX*2+300], *xfrm_msg;
1364 struct diff_filespec *one;
1365 struct diff_filespec *two;
1366 const char *name;
1367 const char *other;
1368 char *name_munged, *other_munged;
1369 int complete_rewrite = 0;
1370 int len;
1371
1372 if (DIFF_PAIR_UNMERGED(p)) {
1373 /* unmerged */
1374 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1375 return;
1376 }
1377
1378 name = p->one->path;
1379 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1380 name_munged = quote_one(name);
1381 other_munged = quote_one(other);
1382 one = p->one; two = p->two;
1383
1384 diff_fill_sha1_info(one);
1385 diff_fill_sha1_info(two);
1386
1387 len = 0;
1388 switch (p->status) {
1389 case DIFF_STATUS_COPIED:
1390 len += snprintf(msg + len, sizeof(msg) - len,
1391 "similarity index %d%%\n"
1392 "copy from %s\n"
1393 "copy to %s\n",
1394 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1395 name_munged, other_munged);
1396 break;
1397 case DIFF_STATUS_RENAMED:
1398 len += snprintf(msg + len, sizeof(msg) - len,
1399 "similarity index %d%%\n"
1400 "rename from %s\n"
1401 "rename to %s\n",
1402 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1403 name_munged, other_munged);
1404 break;
1405 case DIFF_STATUS_MODIFIED:
1406 if (p->score) {
1407 len += snprintf(msg + len, sizeof(msg) - len,
1408 "dissimilarity index %d%%\n",
1409 (int)(0.5 + p->score *
1410 100.0/MAX_SCORE));
1411 complete_rewrite = 1;
1412 break;
1413 }
1414 /* fallthru */
1415 default:
1416 /* nothing */
1417 ;
1418 }
1419
1420 if (memcmp(one->sha1, two->sha1, 20)) {
1421 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1422
1423 len += snprintf(msg + len, sizeof(msg) - len,
1424 "index %.*s..%.*s",
1425 abbrev, sha1_to_hex(one->sha1),
1426 abbrev, sha1_to_hex(two->sha1));
1427 if (one->mode == two->mode)
1428 len += snprintf(msg + len, sizeof(msg) - len,
1429 " %06o", one->mode);
1430 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1431 }
1432
1433 if (len)
1434 msg[--len] = 0;
1435 xfrm_msg = len ? msg : NULL;
1436
1437 if (!pgm &&
1438 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1439 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1440 /* a filepair that changes between file and symlink
1441 * needs to be split into deletion and creation.
1442 */
1443 struct diff_filespec *null = alloc_filespec(two->path);
1444 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1445 free(null);
1446 null = alloc_filespec(one->path);
1447 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1448 free(null);
1449 }
1450 else
1451 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1452 complete_rewrite);
1453
1454 free(name_munged);
1455 free(other_munged);
1456 }
1457
1458 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1459 struct diffstat_t *diffstat)
1460 {
1461 const char *name;
1462 const char *other;
1463 int complete_rewrite = 0;
1464
1465 if (DIFF_PAIR_UNMERGED(p)) {
1466 /* unmerged */
1467 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1468 return;
1469 }
1470
1471 name = p->one->path;
1472 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1473
1474 diff_fill_sha1_info(p->one);
1475 diff_fill_sha1_info(p->two);
1476
1477 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1478 complete_rewrite = 1;
1479 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
1480 }
1481
1482 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1483 {
1484 const char *name;
1485 const char *other;
1486
1487 if (DIFF_PAIR_UNMERGED(p)) {
1488 /* unmerged */
1489 return;
1490 }
1491
1492 name = p->one->path;
1493 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1494
1495 diff_fill_sha1_info(p->one);
1496 diff_fill_sha1_info(p->two);
1497
1498 builtin_checkdiff(name, other, p->one, p->two);
1499 }
1500
1501 void diff_setup(struct diff_options *options)
1502 {
1503 memset(options, 0, sizeof(*options));
1504 options->line_termination = '\n';
1505 options->break_opt = -1;
1506 options->rename_limit = -1;
1507 options->context = 3;
1508 options->msg_sep = "";
1509
1510 options->change = diff_change;
1511 options->add_remove = diff_addremove;
1512 options->color_diff = diff_use_color_default;
1513 options->detect_rename = diff_detect_rename_default;
1514 }
1515
1516 int diff_setup_done(struct diff_options *options)
1517 {
1518 if ((options->find_copies_harder &&
1519 options->detect_rename != DIFF_DETECT_COPY) ||
1520 (0 <= options->rename_limit && !options->detect_rename))
1521 return -1;
1522
1523 if (options->output_format & (DIFF_FORMAT_NAME |
1524 DIFF_FORMAT_NAME_STATUS |
1525 DIFF_FORMAT_CHECKDIFF |
1526 DIFF_FORMAT_NO_OUTPUT))
1527 options->output_format &= ~(DIFF_FORMAT_RAW |
1528 DIFF_FORMAT_DIFFSTAT |
1529 DIFF_FORMAT_SUMMARY |
1530 DIFF_FORMAT_PATCH);
1531
1532 /*
1533 * These cases always need recursive; we do not drop caller-supplied
1534 * recursive bits for other formats here.
1535 */
1536 if (options->output_format & (DIFF_FORMAT_PATCH |
1537 DIFF_FORMAT_DIFFSTAT |
1538 DIFF_FORMAT_CHECKDIFF))
1539 options->recursive = 1;
1540 /*
1541 * Also pickaxe would not work very well if you do not say recursive
1542 */
1543 if (options->pickaxe)
1544 options->recursive = 1;
1545
1546 if (options->detect_rename && options->rename_limit < 0)
1547 options->rename_limit = diff_rename_limit_default;
1548 if (options->setup & DIFF_SETUP_USE_CACHE) {
1549 if (!active_cache)
1550 /* read-cache does not die even when it fails
1551 * so it is safe for us to do this here. Also
1552 * it does not smudge active_cache or active_nr
1553 * when it fails, so we do not have to worry about
1554 * cleaning it up ourselves either.
1555 */
1556 read_cache();
1557 }
1558 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
1559 use_size_cache = 1;
1560 if (options->abbrev <= 0 || 40 < options->abbrev)
1561 options->abbrev = 40; /* full */
1562
1563 return 0;
1564 }
1565
1566 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
1567 {
1568 char c, *eq;
1569 int len;
1570
1571 if (*arg != '-')
1572 return 0;
1573 c = *++arg;
1574 if (!c)
1575 return 0;
1576 if (c == arg_short) {
1577 c = *++arg;
1578 if (!c)
1579 return 1;
1580 if (val && isdigit(c)) {
1581 char *end;
1582 int n = strtoul(arg, &end, 10);
1583 if (*end)
1584 return 0;
1585 *val = n;
1586 return 1;
1587 }
1588 return 0;
1589 }
1590 if (c != '-')
1591 return 0;
1592 arg++;
1593 eq = strchr(arg, '=');
1594 if (eq)
1595 len = eq - arg;
1596 else
1597 len = strlen(arg);
1598 if (!len || strncmp(arg, arg_long, len))
1599 return 0;
1600 if (eq) {
1601 int n;
1602 char *end;
1603 if (!isdigit(*++eq))
1604 return 0;
1605 n = strtoul(eq, &end, 10);
1606 if (*end)
1607 return 0;
1608 *val = n;
1609 }
1610 return 1;
1611 }
1612
1613 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
1614 {
1615 const char *arg = av[0];
1616 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
1617 options->output_format |= DIFF_FORMAT_PATCH;
1618 else if (opt_arg(arg, 'U', "unified", &options->context))
1619 options->output_format |= DIFF_FORMAT_PATCH;
1620 else if (!strcmp(arg, "--raw"))
1621 options->output_format |= DIFF_FORMAT_RAW;
1622 else if (!strcmp(arg, "--patch-with-raw")) {
1623 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
1624 }
1625 else if (!strcmp(arg, "--stat"))
1626 options->output_format |= DIFF_FORMAT_DIFFSTAT;
1627 else if (!strcmp(arg, "--check"))
1628 options->output_format |= DIFF_FORMAT_CHECKDIFF;
1629 else if (!strcmp(arg, "--summary"))
1630 options->output_format |= DIFF_FORMAT_SUMMARY;
1631 else if (!strcmp(arg, "--patch-with-stat")) {
1632 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
1633 }
1634 else if (!strcmp(arg, "-z"))
1635 options->line_termination = 0;
1636 else if (!strncmp(arg, "-l", 2))
1637 options->rename_limit = strtoul(arg+2, NULL, 10);
1638 else if (!strcmp(arg, "--full-index"))
1639 options->full_index = 1;
1640 else if (!strcmp(arg, "--binary")) {
1641 options->output_format |= DIFF_FORMAT_PATCH;
1642 options->full_index = options->binary = 1;
1643 }
1644 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
1645 options->text = 1;
1646 }
1647 else if (!strcmp(arg, "--name-only"))
1648 options->output_format |= DIFF_FORMAT_NAME;
1649 else if (!strcmp(arg, "--name-status"))
1650 options->output_format |= DIFF_FORMAT_NAME_STATUS;
1651 else if (!strcmp(arg, "-R"))
1652 options->reverse_diff = 1;
1653 else if (!strncmp(arg, "-S", 2))
1654 options->pickaxe = arg + 2;
1655 else if (!strcmp(arg, "-s")) {
1656 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
1657 }
1658 else if (!strncmp(arg, "-O", 2))
1659 options->orderfile = arg + 2;
1660 else if (!strncmp(arg, "--diff-filter=", 14))
1661 options->filter = arg + 14;
1662 else if (!strcmp(arg, "--pickaxe-all"))
1663 options->pickaxe_opts = DIFF_PICKAXE_ALL;
1664 else if (!strcmp(arg, "--pickaxe-regex"))
1665 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
1666 else if (!strncmp(arg, "-B", 2)) {
1667 if ((options->break_opt =
1668 diff_scoreopt_parse(arg)) == -1)
1669 return -1;
1670 }
1671 else if (!strncmp(arg, "-M", 2)) {
1672 if ((options->rename_score =
1673 diff_scoreopt_parse(arg)) == -1)
1674 return -1;
1675 options->detect_rename = DIFF_DETECT_RENAME;
1676 }
1677 else if (!strncmp(arg, "-C", 2)) {
1678 if ((options->rename_score =
1679 diff_scoreopt_parse(arg)) == -1)
1680 return -1;
1681 options->detect_rename = DIFF_DETECT_COPY;
1682 }
1683 else if (!strcmp(arg, "--find-copies-harder"))
1684 options->find_copies_harder = 1;
1685 else if (!strcmp(arg, "--abbrev"))
1686 options->abbrev = DEFAULT_ABBREV;
1687 else if (!strncmp(arg, "--abbrev=", 9)) {
1688 options->abbrev = strtoul(arg + 9, NULL, 10);
1689 if (options->abbrev < MINIMUM_ABBREV)
1690 options->abbrev = MINIMUM_ABBREV;
1691 else if (40 < options->abbrev)
1692 options->abbrev = 40;
1693 }
1694 else if (!strcmp(arg, "--color"))
1695 options->color_diff = 1;
1696 else if (!strcmp(arg, "--no-color"))
1697 options->color_diff = 0;
1698 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
1699 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
1700 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
1701 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
1702 else if (!strcmp(arg, "--no-renames"))
1703 options->detect_rename = 0;
1704 else
1705 return 0;
1706 return 1;
1707 }
1708
1709 static int parse_num(const char **cp_p)
1710 {
1711 unsigned long num, scale;
1712 int ch, dot;
1713 const char *cp = *cp_p;
1714
1715 num = 0;
1716 scale = 1;
1717 dot = 0;
1718 for(;;) {
1719 ch = *cp;
1720 if ( !dot && ch == '.' ) {
1721 scale = 1;
1722 dot = 1;
1723 } else if ( ch == '%' ) {
1724 scale = dot ? scale*100 : 100;
1725 cp++; /* % is always at the end */
1726 break;
1727 } else if ( ch >= '0' && ch <= '9' ) {
1728 if ( scale < 100000 ) {
1729 scale *= 10;
1730 num = (num*10) + (ch-'0');
1731 }
1732 } else {
1733 break;
1734 }
1735 cp++;
1736 }
1737 *cp_p = cp;
1738
1739 /* user says num divided by scale and we say internally that
1740 * is MAX_SCORE * num / scale.
1741 */
1742 return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
1743 }
1744
1745 int diff_scoreopt_parse(const char *opt)
1746 {
1747 int opt1, opt2, cmd;
1748
1749 if (*opt++ != '-')
1750 return -1;
1751 cmd = *opt++;
1752 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
1753 return -1; /* that is not a -M, -C nor -B option */
1754
1755 opt1 = parse_num(&opt);
1756 if (cmd != 'B')
1757 opt2 = 0;
1758 else {
1759 if (*opt == 0)
1760 opt2 = 0;
1761 else if (*opt != '/')
1762 return -1; /* we expect -B80/99 or -B80 */
1763 else {
1764 opt++;
1765 opt2 = parse_num(&opt);
1766 }
1767 }
1768 if (*opt != 0)
1769 return -1;
1770 return opt1 | (opt2 << 16);
1771 }
1772
1773 struct diff_queue_struct diff_queued_diff;
1774
1775 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
1776 {
1777 if (queue->alloc <= queue->nr) {
1778 queue->alloc = alloc_nr(queue->alloc);
1779 queue->queue = xrealloc(queue->queue,
1780 sizeof(dp) * queue->alloc);
1781 }
1782 queue->queue[queue->nr++] = dp;
1783 }
1784
1785 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
1786 struct diff_filespec *one,
1787 struct diff_filespec *two)
1788 {
1789 struct diff_filepair *dp = xmalloc(sizeof(*dp));
1790 dp->one = one;
1791 dp->two = two;
1792 dp->score = 0;
1793 dp->status = 0;
1794 dp->source_stays = 0;
1795 dp->broken_pair = 0;
1796 if (queue)
1797 diff_q(queue, dp);
1798 return dp;
1799 }
1800
1801 void diff_free_filepair(struct diff_filepair *p)
1802 {
1803 diff_free_filespec_data(p->one);
1804 diff_free_filespec_data(p->two);
1805 free(p->one);
1806 free(p->two);
1807 free(p);
1808 }
1809
1810 /* This is different from find_unique_abbrev() in that
1811 * it stuffs the result with dots for alignment.
1812 */
1813 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
1814 {
1815 int abblen;
1816 const char *abbrev;
1817 if (len == 40)
1818 return sha1_to_hex(sha1);
1819
1820 abbrev = find_unique_abbrev(sha1, len);
1821 if (!abbrev)
1822 return sha1_to_hex(sha1);
1823 abblen = strlen(abbrev);
1824 if (abblen < 37) {
1825 static char hex[41];
1826 if (len < abblen && abblen <= len + 2)
1827 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
1828 else
1829 sprintf(hex, "%s...", abbrev);
1830 return hex;
1831 }
1832 return sha1_to_hex(sha1);
1833 }
1834
1835 static void diff_flush_raw(struct diff_filepair *p,
1836 struct diff_options *options)
1837 {
1838 int two_paths;
1839 char status[10];
1840 int abbrev = options->abbrev;
1841 const char *path_one, *path_two;
1842 int inter_name_termination = '\t';
1843 int line_termination = options->line_termination;
1844
1845 if (!line_termination)
1846 inter_name_termination = 0;
1847
1848 path_one = p->one->path;
1849 path_two = p->two->path;
1850 if (line_termination) {
1851 path_one = quote_one(path_one);
1852 path_two = quote_one(path_two);
1853 }
1854
1855 if (p->score)
1856 sprintf(status, "%c%03d", p->status,
1857 (int)(0.5 + p->score * 100.0/MAX_SCORE));
1858 else {
1859 status[0] = p->status;
1860 status[1] = 0;
1861 }
1862 switch (p->status) {
1863 case DIFF_STATUS_COPIED:
1864 case DIFF_STATUS_RENAMED:
1865 two_paths = 1;
1866 break;
1867 case DIFF_STATUS_ADDED:
1868 case DIFF_STATUS_DELETED:
1869 two_paths = 0;
1870 break;
1871 default:
1872 two_paths = 0;
1873 break;
1874 }
1875 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
1876 printf(":%06o %06o %s ",
1877 p->one->mode, p->two->mode,
1878 diff_unique_abbrev(p->one->sha1, abbrev));
1879 printf("%s ",
1880 diff_unique_abbrev(p->two->sha1, abbrev));
1881 }
1882 printf("%s%c%s", status, inter_name_termination, path_one);
1883 if (two_paths)
1884 printf("%c%s", inter_name_termination, path_two);
1885 putchar(line_termination);
1886 if (path_one != p->one->path)
1887 free((void*)path_one);
1888 if (path_two != p->two->path)
1889 free((void*)path_two);
1890 }
1891
1892 static void diff_flush_name(struct diff_filepair *p, int line_termination)
1893 {
1894 char *path = p->two->path;
1895
1896 if (line_termination)
1897 path = quote_one(p->two->path);
1898 printf("%s%c", path, line_termination);
1899 if (p->two->path != path)
1900 free(path);
1901 }
1902
1903 int diff_unmodified_pair(struct diff_filepair *p)
1904 {
1905 /* This function is written stricter than necessary to support
1906 * the currently implemented transformers, but the idea is to
1907 * let transformers to produce diff_filepairs any way they want,
1908 * and filter and clean them up here before producing the output.
1909 */
1910 struct diff_filespec *one, *two;
1911
1912 if (DIFF_PAIR_UNMERGED(p))
1913 return 0; /* unmerged is interesting */
1914
1915 one = p->one;
1916 two = p->two;
1917
1918 /* deletion, addition, mode or type change
1919 * and rename are all interesting.
1920 */
1921 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
1922 DIFF_PAIR_MODE_CHANGED(p) ||
1923 strcmp(one->path, two->path))
1924 return 0;
1925
1926 /* both are valid and point at the same path. that is, we are
1927 * dealing with a change.
1928 */
1929 if (one->sha1_valid && two->sha1_valid &&
1930 !memcmp(one->sha1, two->sha1, sizeof(one->sha1)))
1931 return 1; /* no change */
1932 if (!one->sha1_valid && !two->sha1_valid)
1933 return 1; /* both look at the same file on the filesystem. */
1934 return 0;
1935 }
1936
1937 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
1938 {
1939 if (diff_unmodified_pair(p))
1940 return;
1941
1942 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1943 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1944 return; /* no tree diffs in patch format */
1945
1946 run_diff(p, o);
1947 }
1948
1949 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
1950 struct diffstat_t *diffstat)
1951 {
1952 if (diff_unmodified_pair(p))
1953 return;
1954
1955 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1956 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1957 return; /* no tree diffs in patch format */
1958
1959 run_diffstat(p, o, diffstat);
1960 }
1961
1962 static void diff_flush_checkdiff(struct diff_filepair *p,
1963 struct diff_options *o)
1964 {
1965 if (diff_unmodified_pair(p))
1966 return;
1967
1968 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1969 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1970 return; /* no tree diffs in patch format */
1971
1972 run_checkdiff(p, o);
1973 }
1974
1975 int diff_queue_is_empty(void)
1976 {
1977 struct diff_queue_struct *q = &diff_queued_diff;
1978 int i;
1979 for (i = 0; i < q->nr; i++)
1980 if (!diff_unmodified_pair(q->queue[i]))
1981 return 0;
1982 return 1;
1983 }
1984
1985 #if DIFF_DEBUG
1986 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
1987 {
1988 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
1989 x, one ? one : "",
1990 s->path,
1991 DIFF_FILE_VALID(s) ? "valid" : "invalid",
1992 s->mode,
1993 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
1994 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
1995 x, one ? one : "",
1996 s->size, s->xfrm_flags);
1997 }
1998
1999 void diff_debug_filepair(const struct diff_filepair *p, int i)
2000 {
2001 diff_debug_filespec(p->one, i, "one");
2002 diff_debug_filespec(p->two, i, "two");
2003 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2004 p->score, p->status ? p->status : '?',
2005 p->source_stays, p->broken_pair);
2006 }
2007
2008 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2009 {
2010 int i;
2011 if (msg)
2012 fprintf(stderr, "%s\n", msg);
2013 fprintf(stderr, "q->nr = %d\n", q->nr);
2014 for (i = 0; i < q->nr; i++) {
2015 struct diff_filepair *p = q->queue[i];
2016 diff_debug_filepair(p, i);
2017 }
2018 }
2019 #endif
2020
2021 static void diff_resolve_rename_copy(void)
2022 {
2023 int i, j;
2024 struct diff_filepair *p, *pp;
2025 struct diff_queue_struct *q = &diff_queued_diff;
2026
2027 diff_debug_queue("resolve-rename-copy", q);
2028
2029 for (i = 0; i < q->nr; i++) {
2030 p = q->queue[i];
2031 p->status = 0; /* undecided */
2032 if (DIFF_PAIR_UNMERGED(p))
2033 p->status = DIFF_STATUS_UNMERGED;
2034 else if (!DIFF_FILE_VALID(p->one))
2035 p->status = DIFF_STATUS_ADDED;
2036 else if (!DIFF_FILE_VALID(p->two))
2037 p->status = DIFF_STATUS_DELETED;
2038 else if (DIFF_PAIR_TYPE_CHANGED(p))
2039 p->status = DIFF_STATUS_TYPE_CHANGED;
2040
2041 /* from this point on, we are dealing with a pair
2042 * whose both sides are valid and of the same type, i.e.
2043 * either in-place edit or rename/copy edit.
2044 */
2045 else if (DIFF_PAIR_RENAME(p)) {
2046 if (p->source_stays) {
2047 p->status = DIFF_STATUS_COPIED;
2048 continue;
2049 }
2050 /* See if there is some other filepair that
2051 * copies from the same source as us. If so
2052 * we are a copy. Otherwise we are either a
2053 * copy if the path stays, or a rename if it
2054 * does not, but we already handled "stays" case.
2055 */
2056 for (j = i + 1; j < q->nr; j++) {
2057 pp = q->queue[j];
2058 if (strcmp(pp->one->path, p->one->path))
2059 continue; /* not us */
2060 if (!DIFF_PAIR_RENAME(pp))
2061 continue; /* not a rename/copy */
2062 /* pp is a rename/copy from the same source */
2063 p->status = DIFF_STATUS_COPIED;
2064 break;
2065 }
2066 if (!p->status)
2067 p->status = DIFF_STATUS_RENAMED;
2068 }
2069 else if (memcmp(p->one->sha1, p->two->sha1, 20) ||
2070 p->one->mode != p->two->mode)
2071 p->status = DIFF_STATUS_MODIFIED;
2072 else {
2073 /* This is a "no-change" entry and should not
2074 * happen anymore, but prepare for broken callers.
2075 */
2076 error("feeding unmodified %s to diffcore",
2077 p->one->path);
2078 p->status = DIFF_STATUS_UNKNOWN;
2079 }
2080 }
2081 diff_debug_queue("resolve-rename-copy done", q);
2082 }
2083
2084 static int check_pair_status(struct diff_filepair *p)
2085 {
2086 switch (p->status) {
2087 case DIFF_STATUS_UNKNOWN:
2088 return 0;
2089 case 0:
2090 die("internal error in diff-resolve-rename-copy");
2091 default:
2092 return 1;
2093 }
2094 }
2095
2096 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2097 {
2098 int fmt = opt->output_format;
2099
2100 if (fmt & DIFF_FORMAT_CHECKDIFF)
2101 diff_flush_checkdiff(p, opt);
2102 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2103 diff_flush_raw(p, opt);
2104 else if (fmt & DIFF_FORMAT_NAME)
2105 diff_flush_name(p, opt->line_termination);
2106 }
2107
2108 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2109 {
2110 if (fs->mode)
2111 printf(" %s mode %06o %s\n", newdelete, fs->mode, fs->path);
2112 else
2113 printf(" %s %s\n", newdelete, fs->path);
2114 }
2115
2116
2117 static void show_mode_change(struct diff_filepair *p, int show_name)
2118 {
2119 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2120 if (show_name)
2121 printf(" mode change %06o => %06o %s\n",
2122 p->one->mode, p->two->mode, p->two->path);
2123 else
2124 printf(" mode change %06o => %06o\n",
2125 p->one->mode, p->two->mode);
2126 }
2127 }
2128
2129 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2130 {
2131 const char *old, *new;
2132
2133 /* Find common prefix */
2134 old = p->one->path;
2135 new = p->two->path;
2136 while (1) {
2137 const char *slash_old, *slash_new;
2138 slash_old = strchr(old, '/');
2139 slash_new = strchr(new, '/');
2140 if (!slash_old ||
2141 !slash_new ||
2142 slash_old - old != slash_new - new ||
2143 memcmp(old, new, slash_new - new))
2144 break;
2145 old = slash_old + 1;
2146 new = slash_new + 1;
2147 }
2148 /* p->one->path thru old is the common prefix, and old and new
2149 * through the end of names are renames
2150 */
2151 if (old != p->one->path)
2152 printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
2153 (int)(old - p->one->path), p->one->path,
2154 old, new, (int)(0.5 + p->score * 100.0/MAX_SCORE));
2155 else
2156 printf(" %s %s => %s (%d%%)\n", renamecopy,
2157 p->one->path, p->two->path,
2158 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2159 show_mode_change(p, 0);
2160 }
2161
2162 static void diff_summary(struct diff_filepair *p)
2163 {
2164 switch(p->status) {
2165 case DIFF_STATUS_DELETED:
2166 show_file_mode_name("delete", p->one);
2167 break;
2168 case DIFF_STATUS_ADDED:
2169 show_file_mode_name("create", p->two);
2170 break;
2171 case DIFF_STATUS_COPIED:
2172 show_rename_copy("copy", p);
2173 break;
2174 case DIFF_STATUS_RENAMED:
2175 show_rename_copy("rename", p);
2176 break;
2177 default:
2178 if (p->score) {
2179 printf(" rewrite %s (%d%%)\n", p->two->path,
2180 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2181 show_mode_change(p, 0);
2182 } else show_mode_change(p, 1);
2183 break;
2184 }
2185 }
2186
2187 struct patch_id_t {
2188 struct xdiff_emit_state xm;
2189 SHA_CTX *ctx;
2190 int patchlen;
2191 };
2192
2193 static int remove_space(char *line, int len)
2194 {
2195 int i;
2196 char *dst = line;
2197 unsigned char c;
2198
2199 for (i = 0; i < len; i++)
2200 if (!isspace((c = line[i])))
2201 *dst++ = c;
2202
2203 return dst - line;
2204 }
2205
2206 static void patch_id_consume(void *priv, char *line, unsigned long len)
2207 {
2208 struct patch_id_t *data = priv;
2209 int new_len;
2210
2211 /* Ignore line numbers when computing the SHA1 of the patch */
2212 if (!strncmp(line, "@@ -", 4))
2213 return;
2214
2215 new_len = remove_space(line, len);
2216
2217 SHA1_Update(data->ctx, line, new_len);
2218 data->patchlen += new_len;
2219 }
2220
2221 /* returns 0 upon success, and writes result into sha1 */
2222 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2223 {
2224 struct diff_queue_struct *q = &diff_queued_diff;
2225 int i;
2226 SHA_CTX ctx;
2227 struct patch_id_t data;
2228 char buffer[PATH_MAX * 4 + 20];
2229
2230 SHA1_Init(&ctx);
2231 memset(&data, 0, sizeof(struct patch_id_t));
2232 data.ctx = &ctx;
2233 data.xm.consume = patch_id_consume;
2234
2235 for (i = 0; i < q->nr; i++) {
2236 xpparam_t xpp;
2237 xdemitconf_t xecfg;
2238 xdemitcb_t ecb;
2239 mmfile_t mf1, mf2;
2240 struct diff_filepair *p = q->queue[i];
2241 int len1, len2;
2242
2243 if (p->status == 0)
2244 return error("internal diff status error");
2245 if (p->status == DIFF_STATUS_UNKNOWN)
2246 continue;
2247 if (diff_unmodified_pair(p))
2248 continue;
2249 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2250 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2251 continue;
2252 if (DIFF_PAIR_UNMERGED(p))
2253 continue;
2254
2255 diff_fill_sha1_info(p->one);
2256 diff_fill_sha1_info(p->two);
2257 if (fill_mmfile(&mf1, p->one) < 0 ||
2258 fill_mmfile(&mf2, p->two) < 0)
2259 return error("unable to read files to diff");
2260
2261 /* Maybe hash p->two? into the patch id? */
2262 if (mmfile_is_binary(&mf2))
2263 continue;
2264
2265 len1 = remove_space(p->one->path, strlen(p->one->path));
2266 len2 = remove_space(p->two->path, strlen(p->two->path));
2267 if (p->one->mode == 0)
2268 len1 = snprintf(buffer, sizeof(buffer),
2269 "diff--gita/%.*sb/%.*s"
2270 "newfilemode%06o"
2271 "---/dev/null"
2272 "+++b/%.*s",
2273 len1, p->one->path,
2274 len2, p->two->path,
2275 p->two->mode,
2276 len2, p->two->path);
2277 else if (p->two->mode == 0)
2278 len1 = snprintf(buffer, sizeof(buffer),
2279 "diff--gita/%.*sb/%.*s"
2280 "deletedfilemode%06o"
2281 "---a/%.*s"
2282 "+++/dev/null",
2283 len1, p->one->path,
2284 len2, p->two->path,
2285 p->one->mode,
2286 len1, p->one->path);
2287 else
2288 len1 = snprintf(buffer, sizeof(buffer),
2289 "diff--gita/%.*sb/%.*s"
2290 "---a/%.*s"
2291 "+++b/%.*s",
2292 len1, p->one->path,
2293 len2, p->two->path,
2294 len1, p->one->path,
2295 len2, p->two->path);
2296 SHA1_Update(&ctx, buffer, len1);
2297
2298 xpp.flags = XDF_NEED_MINIMAL;
2299 xecfg.ctxlen = 3;
2300 xecfg.flags = XDL_EMIT_FUNCNAMES;
2301 ecb.outf = xdiff_outf;
2302 ecb.priv = &data;
2303 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2304 }
2305
2306 SHA1_Final(sha1, &ctx);
2307 return 0;
2308 }
2309
2310 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2311 {
2312 struct diff_queue_struct *q = &diff_queued_diff;
2313 int i;
2314 int result = diff_get_patch_id(options, sha1);
2315
2316 for (i = 0; i < q->nr; i++)
2317 diff_free_filepair(q->queue[i]);
2318
2319 free(q->queue);
2320 q->queue = NULL;
2321 q->nr = q->alloc = 0;
2322
2323 return result;
2324 }
2325
2326 static int is_summary_empty(const struct diff_queue_struct *q)
2327 {
2328 int i;
2329
2330 for (i = 0; i < q->nr; i++) {
2331 const struct diff_filepair *p = q->queue[i];
2332
2333 switch (p->status) {
2334 case DIFF_STATUS_DELETED:
2335 case DIFF_STATUS_ADDED:
2336 case DIFF_STATUS_COPIED:
2337 case DIFF_STATUS_RENAMED:
2338 return 0;
2339 default:
2340 if (p->score)
2341 return 0;
2342 if (p->one->mode && p->two->mode &&
2343 p->one->mode != p->two->mode)
2344 return 0;
2345 break;
2346 }
2347 }
2348 return 1;
2349 }
2350
2351 void diff_flush(struct diff_options *options)
2352 {
2353 struct diff_queue_struct *q = &diff_queued_diff;
2354 int i, output_format = options->output_format;
2355 int separator = 0;
2356
2357 /*
2358 * Order: raw, stat, summary, patch
2359 * or: name/name-status/checkdiff (other bits clear)
2360 */
2361 if (!q->nr)
2362 goto free_queue;
2363
2364 if (output_format & (DIFF_FORMAT_RAW |
2365 DIFF_FORMAT_NAME |
2366 DIFF_FORMAT_NAME_STATUS |
2367 DIFF_FORMAT_CHECKDIFF)) {
2368 for (i = 0; i < q->nr; i++) {
2369 struct diff_filepair *p = q->queue[i];
2370 if (check_pair_status(p))
2371 flush_one_pair(p, options);
2372 }
2373 separator++;
2374 }
2375
2376 if (output_format & DIFF_FORMAT_DIFFSTAT) {
2377 struct diffstat_t diffstat;
2378
2379 memset(&diffstat, 0, sizeof(struct diffstat_t));
2380 diffstat.xm.consume = diffstat_consume;
2381 for (i = 0; i < q->nr; i++) {
2382 struct diff_filepair *p = q->queue[i];
2383 if (check_pair_status(p))
2384 diff_flush_stat(p, options, &diffstat);
2385 }
2386 show_stats(&diffstat);
2387 separator++;
2388 }
2389
2390 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2391 for (i = 0; i < q->nr; i++)
2392 diff_summary(q->queue[i]);
2393 separator++;
2394 }
2395
2396 if (output_format & DIFF_FORMAT_PATCH) {
2397 if (separator) {
2398 if (options->stat_sep) {
2399 /* attach patch instead of inline */
2400 fputs(options->stat_sep, stdout);
2401 } else {
2402 putchar(options->line_termination);
2403 }
2404 }
2405
2406 for (i = 0; i < q->nr; i++) {
2407 struct diff_filepair *p = q->queue[i];
2408 if (check_pair_status(p))
2409 diff_flush_patch(p, options);
2410 }
2411 }
2412
2413 for (i = 0; i < q->nr; i++)
2414 diff_free_filepair(q->queue[i]);
2415 free_queue:
2416 free(q->queue);
2417 q->queue = NULL;
2418 q->nr = q->alloc = 0;
2419 }
2420
2421 static void diffcore_apply_filter(const char *filter)
2422 {
2423 int i;
2424 struct diff_queue_struct *q = &diff_queued_diff;
2425 struct diff_queue_struct outq;
2426 outq.queue = NULL;
2427 outq.nr = outq.alloc = 0;
2428
2429 if (!filter)
2430 return;
2431
2432 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2433 int found;
2434 for (i = found = 0; !found && i < q->nr; i++) {
2435 struct diff_filepair *p = q->queue[i];
2436 if (((p->status == DIFF_STATUS_MODIFIED) &&
2437 ((p->score &&
2438 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2439 (!p->score &&
2440 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2441 ((p->status != DIFF_STATUS_MODIFIED) &&
2442 strchr(filter, p->status)))
2443 found++;
2444 }
2445 if (found)
2446 return;
2447
2448 /* otherwise we will clear the whole queue
2449 * by copying the empty outq at the end of this
2450 * function, but first clear the current entries
2451 * in the queue.
2452 */
2453 for (i = 0; i < q->nr; i++)
2454 diff_free_filepair(q->queue[i]);
2455 }
2456 else {
2457 /* Only the matching ones */
2458 for (i = 0; i < q->nr; i++) {
2459 struct diff_filepair *p = q->queue[i];
2460
2461 if (((p->status == DIFF_STATUS_MODIFIED) &&
2462 ((p->score &&
2463 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2464 (!p->score &&
2465 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2466 ((p->status != DIFF_STATUS_MODIFIED) &&
2467 strchr(filter, p->status)))
2468 diff_q(&outq, p);
2469 else
2470 diff_free_filepair(p);
2471 }
2472 }
2473 free(q->queue);
2474 *q = outq;
2475 }
2476
2477 void diffcore_std(struct diff_options *options)
2478 {
2479 if (options->break_opt != -1)
2480 diffcore_break(options->break_opt);
2481 if (options->detect_rename)
2482 diffcore_rename(options);
2483 if (options->break_opt != -1)
2484 diffcore_merge_broken();
2485 if (options->pickaxe)
2486 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2487 if (options->orderfile)
2488 diffcore_order(options->orderfile);
2489 diff_resolve_rename_copy();
2490 diffcore_apply_filter(options->filter);
2491 }
2492
2493
2494 void diffcore_std_no_resolve(struct diff_options *options)
2495 {
2496 if (options->pickaxe)
2497 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2498 if (options->orderfile)
2499 diffcore_order(options->orderfile);
2500 diffcore_apply_filter(options->filter);
2501 }
2502
2503 void diff_addremove(struct diff_options *options,
2504 int addremove, unsigned mode,
2505 const unsigned char *sha1,
2506 const char *base, const char *path)
2507 {
2508 char concatpath[PATH_MAX];
2509 struct diff_filespec *one, *two;
2510
2511 /* This may look odd, but it is a preparation for
2512 * feeding "there are unchanged files which should
2513 * not produce diffs, but when you are doing copy
2514 * detection you would need them, so here they are"
2515 * entries to the diff-core. They will be prefixed
2516 * with something like '=' or '*' (I haven't decided
2517 * which but should not make any difference).
2518 * Feeding the same new and old to diff_change()
2519 * also has the same effect.
2520 * Before the final output happens, they are pruned after
2521 * merged into rename/copy pairs as appropriate.
2522 */
2523 if (options->reverse_diff)
2524 addremove = (addremove == '+' ? '-' :
2525 addremove == '-' ? '+' : addremove);
2526
2527 if (!path) path = "";
2528 sprintf(concatpath, "%s%s", base, path);
2529 one = alloc_filespec(concatpath);
2530 two = alloc_filespec(concatpath);
2531
2532 if (addremove != '+')
2533 fill_filespec(one, sha1, mode);
2534 if (addremove != '-')
2535 fill_filespec(two, sha1, mode);
2536
2537 diff_queue(&diff_queued_diff, one, two);
2538 }
2539
2540 void diff_change(struct diff_options *options,
2541 unsigned old_mode, unsigned new_mode,
2542 const unsigned char *old_sha1,
2543 const unsigned char *new_sha1,
2544 const char *base, const char *path)
2545 {
2546 char concatpath[PATH_MAX];
2547 struct diff_filespec *one, *two;
2548
2549 if (options->reverse_diff) {
2550 unsigned tmp;
2551 const unsigned char *tmp_c;
2552 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
2553 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
2554 }
2555 if (!path) path = "";
2556 sprintf(concatpath, "%s%s", base, path);
2557 one = alloc_filespec(concatpath);
2558 two = alloc_filespec(concatpath);
2559 fill_filespec(one, old_sha1, old_mode);
2560 fill_filespec(two, new_sha1, new_mode);
2561
2562 diff_queue(&diff_queued_diff, one, two);
2563 }
2564
2565 void diff_unmerge(struct diff_options *options,
2566 const char *path)
2567 {
2568 struct diff_filespec *one, *two;
2569 one = alloc_filespec(path);
2570 two = alloc_filespec(path);
2571 diff_queue(&diff_queued_diff, one, two);
2572 }