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Use fstat instead of fseek
[git/mingw.git] / diff.c
blob70699fd8c48754215934a8ed45db336b9db68918
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;
17 static int diff_rename_limit_default = -1;
18 static int diff_use_color_default;
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 diff_words_buffer {
362 mmfile_t text;
363 long alloc;
364 long current; /* output pointer */
365 int suppressed_newline;
366 };
367
368 static void diff_words_append(char *line, unsigned long len,
369 struct diff_words_buffer *buffer)
370 {
371 if (buffer->text.size + len > buffer->alloc) {
372 buffer->alloc = (buffer->text.size + len) * 3 / 2;
373 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
374 }
375 line++;
376 len--;
377 memcpy(buffer->text.ptr + buffer->text.size, line, len);
378 buffer->text.size += len;
379 }
380
381 struct diff_words_data {
382 struct xdiff_emit_state xm;
383 struct diff_words_buffer minus, plus;
384 };
385
386 static void print_word(struct diff_words_buffer *buffer, int len, int color,
387 int suppress_newline)
388 {
389 const char *ptr;
390 int eol = 0;
391
392 if (len == 0)
393 return;
394
395 ptr = buffer->text.ptr + buffer->current;
396 buffer->current += len;
397
398 if (ptr[len - 1] == '\n') {
399 eol = 1;
400 len--;
401 }
402
403 fputs(diff_get_color(1, color), stdout);
404 fwrite(ptr, len, 1, stdout);
405 fputs(diff_get_color(1, DIFF_RESET), stdout);
406
407 if (eol) {
408 if (suppress_newline)
409 buffer->suppressed_newline = 1;
410 else
411 putchar('\n');
412 }
413 }
414
415 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
416 {
417 struct diff_words_data *diff_words = priv;
418
419 if (diff_words->minus.suppressed_newline) {
420 if (line[0] != '+')
421 putchar('\n');
422 diff_words->minus.suppressed_newline = 0;
423 }
424
425 len--;
426 switch (line[0]) {
427 case '-':
428 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
429 break;
430 case '+':
431 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
432 break;
433 case ' ':
434 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
435 diff_words->minus.current += len;
436 break;
437 }
438 }
439
440 /* this executes the word diff on the accumulated buffers */
441 static void diff_words_show(struct diff_words_data *diff_words)
442 {
443 xpparam_t xpp;
444 xdemitconf_t xecfg;
445 xdemitcb_t ecb;
446 mmfile_t minus, plus;
447 int i;
448
449 minus.size = diff_words->minus.text.size;
450 minus.ptr = xmalloc(minus.size);
451 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
452 for (i = 0; i < minus.size; i++)
453 if (isspace(minus.ptr[i]))
454 minus.ptr[i] = '\n';
455 diff_words->minus.current = 0;
456
457 plus.size = diff_words->plus.text.size;
458 plus.ptr = xmalloc(plus.size);
459 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
460 for (i = 0; i < plus.size; i++)
461 if (isspace(plus.ptr[i]))
462 plus.ptr[i] = '\n';
463 diff_words->plus.current = 0;
464
465 xpp.flags = XDF_NEED_MINIMAL;
466 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
467 xecfg.flags = 0;
468 ecb.outf = xdiff_outf;
469 ecb.priv = diff_words;
470 diff_words->xm.consume = fn_out_diff_words_aux;
471 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
472
473 free(minus.ptr);
474 free(plus.ptr);
475 diff_words->minus.text.size = diff_words->plus.text.size = 0;
476
477 if (diff_words->minus.suppressed_newline) {
478 putchar('\n');
479 diff_words->minus.suppressed_newline = 0;
480 }
481 }
482
483 struct emit_callback {
484 struct xdiff_emit_state xm;
485 int nparents, color_diff;
486 const char **label_path;
487 struct diff_words_data *diff_words;
488 };
489
490 static void free_diff_words_data(struct emit_callback *ecbdata)
491 {
492 if (ecbdata->diff_words) {
493 /* flush buffers */
494 if (ecbdata->diff_words->minus.text.size ||
495 ecbdata->diff_words->plus.text.size)
496 diff_words_show(ecbdata->diff_words);
497
498 if (ecbdata->diff_words->minus.text.ptr)
499 free (ecbdata->diff_words->minus.text.ptr);
500 if (ecbdata->diff_words->plus.text.ptr)
501 free (ecbdata->diff_words->plus.text.ptr);
502 free(ecbdata->diff_words);
503 ecbdata->diff_words = NULL;
504 }
505 }
506
507 const char *diff_get_color(int diff_use_color, enum color_diff ix)
508 {
509 if (diff_use_color)
510 return diff_colors[ix];
511 return "";
512 }
513
514 static void fn_out_consume(void *priv, char *line, unsigned long len)
515 {
516 int i;
517 struct emit_callback *ecbdata = priv;
518 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
519 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
520
521 if (ecbdata->label_path[0]) {
522 printf("%s--- %s%s\n", set, ecbdata->label_path[0], reset);
523 printf("%s+++ %s%s\n", set, ecbdata->label_path[1], reset);
524 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
525 }
526
527 /* This is not really necessary for now because
528 * this codepath only deals with two-way diffs.
529 */
530 for (i = 0; i < len && line[i] == '@'; i++)
531 ;
532 if (2 <= i && i < len && line[i] == ' ') {
533 ecbdata->nparents = i - 1;
534 set = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
535 }
536 else if (len < ecbdata->nparents)
537 set = reset;
538 else {
539 int nparents = ecbdata->nparents;
540 int color = DIFF_PLAIN;
541 if (ecbdata->diff_words && nparents != 1)
542 /* fall back to normal diff */
543 free_diff_words_data(ecbdata);
544 if (ecbdata->diff_words) {
545 if (line[0] == '-') {
546 diff_words_append(line, len,
547 &ecbdata->diff_words->minus);
548 return;
549 } else if (line[0] == '+') {
550 diff_words_append(line, len,
551 &ecbdata->diff_words->plus);
552 return;
553 }
554 if (ecbdata->diff_words->minus.text.size ||
555 ecbdata->diff_words->plus.text.size)
556 diff_words_show(ecbdata->diff_words);
557 line++;
558 len--;
559 } else
560 for (i = 0; i < nparents && len; i++) {
561 if (line[i] == '-')
562 color = DIFF_FILE_OLD;
563 else if (line[i] == '+')
564 color = DIFF_FILE_NEW;
565 }
566 set = diff_get_color(ecbdata->color_diff, color);
567 }
568 if (len > 0 && line[len-1] == '\n')
569 len--;
570 fputs (set, stdout);
571 fwrite (line, len, 1, stdout);
572 puts (reset);
573 }
574
575 static char *pprint_rename(const char *a, const char *b)
576 {
577 const char *old = a;
578 const char *new = b;
579 char *name = NULL;
580 int pfx_length, sfx_length;
581 int len_a = strlen(a);
582 int len_b = strlen(b);
583
584 /* Find common prefix */
585 pfx_length = 0;
586 while (*old && *new && *old == *new) {
587 if (*old == '/')
588 pfx_length = old - a + 1;
589 old++;
590 new++;
591 }
592
593 /* Find common suffix */
594 old = a + len_a;
595 new = b + len_b;
596 sfx_length = 0;
597 while (a <= old && b <= new && *old == *new) {
598 if (*old == '/')
599 sfx_length = len_a - (old - a);
600 old--;
601 new--;
602 }
603
604 /*
605 * pfx{mid-a => mid-b}sfx
606 * {pfx-a => pfx-b}sfx
607 * pfx{sfx-a => sfx-b}
608 * name-a => name-b
609 */
610 if (pfx_length + sfx_length) {
611 int a_midlen = len_a - pfx_length - sfx_length;
612 int b_midlen = len_b - pfx_length - sfx_length;
613 if (a_midlen < 0) a_midlen = 0;
614 if (b_midlen < 0) b_midlen = 0;
615
616 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
617 sprintf(name, "%.*s{%.*s => %.*s}%s",
618 pfx_length, a,
619 a_midlen, a + pfx_length,
620 b_midlen, b + pfx_length,
621 a + len_a - sfx_length);
622 }
623 else {
624 name = xmalloc(len_a + len_b + 5);
625 sprintf(name, "%s => %s", a, b);
626 }
627 return name;
628 }
629
630 struct diffstat_t {
631 struct xdiff_emit_state xm;
632
633 int nr;
634 int alloc;
635 struct diffstat_file {
636 char *name;
637 unsigned is_unmerged:1;
638 unsigned is_binary:1;
639 unsigned is_renamed:1;
640 unsigned int added, deleted;
641 } **files;
642 };
643
644 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
645 const char *name_a,
646 const char *name_b)
647 {
648 struct diffstat_file *x;
649 x = xcalloc(sizeof (*x), 1);
650 if (diffstat->nr == diffstat->alloc) {
651 diffstat->alloc = alloc_nr(diffstat->alloc);
652 diffstat->files = xrealloc(diffstat->files,
653 diffstat->alloc * sizeof(x));
654 }
655 diffstat->files[diffstat->nr++] = x;
656 if (name_b) {
657 x->name = pprint_rename(name_a, name_b);
658 x->is_renamed = 1;
659 }
660 else
661 x->name = strdup(name_a);
662 return x;
663 }
664
665 static void diffstat_consume(void *priv, char *line, unsigned long len)
666 {
667 struct diffstat_t *diffstat = priv;
668 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
669
670 if (line[0] == '+')
671 x->added++;
672 else if (line[0] == '-')
673 x->deleted++;
674 }
675
676 static const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
677 static const char minuses[]= "----------------------------------------------------------------------";
678 const char mime_boundary_leader[] = "------------";
679
680 static void show_stats(struct diffstat_t* data)
681 {
682 int i, len, add, del, total, adds = 0, dels = 0;
683 int max, max_change = 0, max_len = 0;
684 int total_files = data->nr;
685
686 if (data->nr == 0)
687 return;
688
689 for (i = 0; i < data->nr; i++) {
690 struct diffstat_file *file = data->files[i];
691
692 len = strlen(file->name);
693 if (max_len < len)
694 max_len = len;
695
696 if (file->is_binary || file->is_unmerged)
697 continue;
698 if (max_change < file->added + file->deleted)
699 max_change = file->added + file->deleted;
700 }
701
702 for (i = 0; i < data->nr; i++) {
703 const char *prefix = "";
704 char *name = data->files[i]->name;
705 int added = data->files[i]->added;
706 int deleted = data->files[i]->deleted;
707
708 if (0 < (len = quote_c_style(name, NULL, NULL, 0))) {
709 char *qname = xmalloc(len + 1);
710 quote_c_style(name, qname, NULL, 0);
711 free(name);
712 data->files[i]->name = name = qname;
713 }
714
715 /*
716 * "scale" the filename
717 */
718 len = strlen(name);
719 max = max_len;
720 if (max > 50)
721 max = 50;
722 if (len > max) {
723 char *slash;
724 prefix = "...";
725 max -= 3;
726 name += len - max;
727 slash = strchr(name, '/');
728 if (slash)
729 name = slash;
730 }
731 len = max;
732
733 /*
734 * scale the add/delete
735 */
736 max = max_change;
737 if (max + len > 70)
738 max = 70 - len;
739
740 if (data->files[i]->is_binary) {
741 printf(" %s%-*s | Bin\n", prefix, len, name);
742 goto free_diffstat_file;
743 }
744 else if (data->files[i]->is_unmerged) {
745 printf(" %s%-*s | Unmerged\n", prefix, len, name);
746 goto free_diffstat_file;
747 }
748 else if (!data->files[i]->is_renamed &&
749 (added + deleted == 0)) {
750 total_files--;
751 goto free_diffstat_file;
752 }
753
754 add = added;
755 del = deleted;
756 total = add + del;
757 adds += add;
758 dels += del;
759
760 if (max_change > 0) {
761 total = (total * max + max_change / 2) / max_change;
762 add = (add * max + max_change / 2) / max_change;
763 del = total - add;
764 }
765 printf(" %s%-*s |%5d %.*s%.*s\n", prefix,
766 len, name, added + deleted,
767 add, pluses, del, minuses);
768 free_diffstat_file:
769 free(data->files[i]->name);
770 free(data->files[i]);
771 }
772 free(data->files);
773 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
774 total_files, adds, dels);
775 }
776
777 struct checkdiff_t {
778 struct xdiff_emit_state xm;
779 const char *filename;
780 int lineno;
781 };
782
783 static void checkdiff_consume(void *priv, char *line, unsigned long len)
784 {
785 struct checkdiff_t *data = priv;
786
787 if (line[0] == '+') {
788 int i, spaces = 0;
789
790 data->lineno++;
791
792 /* check space before tab */
793 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
794 if (line[i] == ' ')
795 spaces++;
796 if (line[i - 1] == '\t' && spaces)
797 printf("%s:%d: space before tab:%.*s\n",
798 data->filename, data->lineno, (int)len, line);
799
800 /* check white space at line end */
801 if (line[len - 1] == '\n')
802 len--;
803 if (isspace(line[len - 1]))
804 printf("%s:%d: white space at end: %.*s\n",
805 data->filename, data->lineno, (int)len, line);
806 } else if (line[0] == ' ')
807 data->lineno++;
808 else if (line[0] == '@') {
809 char *plus = strchr(line, '+');
810 if (plus)
811 data->lineno = strtol(plus, NULL, 10);
812 else
813 die("invalid diff");
814 }
815 }
816
817 static unsigned char *deflate_it(char *data,
818 unsigned long size,
819 unsigned long *result_size)
820 {
821 int bound;
822 unsigned char *deflated;
823 z_stream stream;
824
825 memset(&stream, 0, sizeof(stream));
826 deflateInit(&stream, zlib_compression_level);
827 bound = deflateBound(&stream, size);
828 deflated = xmalloc(bound);
829 stream.next_out = deflated;
830 stream.avail_out = bound;
831
832 stream.next_in = (unsigned char *)data;
833 stream.avail_in = size;
834 while (deflate(&stream, Z_FINISH) == Z_OK)
835 ; /* nothing */
836 deflateEnd(&stream);
837 *result_size = stream.total_out;
838 return deflated;
839 }
840
841 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
842 {
843 void *cp;
844 void *delta;
845 void *deflated;
846 void *data;
847 unsigned long orig_size;
848 unsigned long delta_size;
849 unsigned long deflate_size;
850 unsigned long data_size;
851
852 /* We could do deflated delta, or we could do just deflated two,
853 * whichever is smaller.
854 */
855 delta = NULL;
856 deflated = deflate_it(two->ptr, two->size, &deflate_size);
857 if (one->size && two->size) {
858 delta = diff_delta(one->ptr, one->size,
859 two->ptr, two->size,
860 &delta_size, deflate_size);
861 if (delta) {
862 void *to_free = delta;
863 orig_size = delta_size;
864 delta = deflate_it(delta, delta_size, &delta_size);
865 free(to_free);
866 }
867 }
868
869 if (delta && delta_size < deflate_size) {
870 printf("delta %lu\n", orig_size);
871 free(deflated);
872 data = delta;
873 data_size = delta_size;
874 }
875 else {
876 printf("literal %lu\n", two->size);
877 free(delta);
878 data = deflated;
879 data_size = deflate_size;
880 }
881
882 /* emit data encoded in base85 */
883 cp = data;
884 while (data_size) {
885 int bytes = (52 < data_size) ? 52 : data_size;
886 char line[70];
887 data_size -= bytes;
888 if (bytes <= 26)
889 line[0] = bytes + 'A' - 1;
890 else
891 line[0] = bytes - 26 + 'a' - 1;
892 encode_85(line + 1, cp, bytes);
893 cp = (char *) cp + bytes;
894 puts(line);
895 }
896 printf("\n");
897 free(data);
898 }
899
900 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
901 {
902 printf("GIT binary patch\n");
903 emit_binary_diff_body(one, two);
904 emit_binary_diff_body(two, one);
905 }
906
907 #define FIRST_FEW_BYTES 8000
908 static int mmfile_is_binary(mmfile_t *mf)
909 {
910 long sz = mf->size;
911 if (FIRST_FEW_BYTES < sz)
912 sz = FIRST_FEW_BYTES;
913 return !!memchr(mf->ptr, 0, sz);
914 }
915
916 static void builtin_diff(const char *name_a,
917 const char *name_b,
918 struct diff_filespec *one,
919 struct diff_filespec *two,
920 const char *xfrm_msg,
921 struct diff_options *o,
922 int complete_rewrite)
923 {
924 mmfile_t mf1, mf2;
925 const char *lbl[2];
926 char *a_one, *b_two;
927 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
928 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
929
930 a_one = quote_two("a/", name_a);
931 b_two = quote_two("b/", name_b);
932 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
933 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
934 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
935 if (lbl[0][0] == '/') {
936 /* /dev/null */
937 printf("%snew file mode %06o%s\n", set, two->mode, reset);
938 if (xfrm_msg && xfrm_msg[0])
939 printf("%s%s%s\n", set, xfrm_msg, reset);
940 }
941 else if (lbl[1][0] == '/') {
942 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
943 if (xfrm_msg && xfrm_msg[0])
944 printf("%s%s%s\n", set, xfrm_msg, reset);
945 }
946 else {
947 if (one->mode != two->mode) {
948 printf("%sold mode %06o%s\n", set, one->mode, reset);
949 printf("%snew mode %06o%s\n", set, two->mode, reset);
950 }
951 if (xfrm_msg && xfrm_msg[0])
952 printf("%s%s%s\n", set, xfrm_msg, reset);
953 /*
954 * we do not run diff between different kind
955 * of objects.
956 */
957 if ((one->mode ^ two->mode) & S_IFMT)
958 goto free_ab_and_return;
959 if (complete_rewrite) {
960 emit_rewrite_diff(name_a, name_b, one, two);
961 goto free_ab_and_return;
962 }
963 }
964
965 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
966 die("unable to read files to diff");
967
968 if (!o->text && (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))) {
969 /* Quite common confusing case */
970 if (mf1.size == mf2.size &&
971 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
972 goto free_ab_and_return;
973 if (o->binary)
974 emit_binary_diff(&mf1, &mf2);
975 else
976 printf("Binary files %s and %s differ\n",
977 lbl[0], lbl[1]);
978 }
979 else {
980 /* Crazy xdl interfaces.. */
981 const char *diffopts = getenv("GIT_DIFF_OPTS");
982 xpparam_t xpp;
983 xdemitconf_t xecfg;
984 xdemitcb_t ecb;
985 struct emit_callback ecbdata;
986
987 memset(&ecbdata, 0, sizeof(ecbdata));
988 ecbdata.label_path = lbl;
989 ecbdata.color_diff = o->color_diff;
990 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
991 xecfg.ctxlen = o->context;
992 xecfg.flags = XDL_EMIT_FUNCNAMES;
993 if (!diffopts)
994 ;
995 else if (!strncmp(diffopts, "--unified=", 10))
996 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
997 else if (!strncmp(diffopts, "-u", 2))
998 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
999 ecb.outf = xdiff_outf;
1000 ecb.priv = &ecbdata;
1001 ecbdata.xm.consume = fn_out_consume;
1002 if (o->color_diff_words)
1003 ecbdata.diff_words =
1004 xcalloc(1, sizeof(struct diff_words_data));
1005 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1006 if (o->color_diff_words)
1007 free_diff_words_data(&ecbdata);
1008 }
1009
1010 free_ab_and_return:
1011 free(a_one);
1012 free(b_two);
1013 return;
1014 }
1015
1016 static void builtin_diffstat(const char *name_a, const char *name_b,
1017 struct diff_filespec *one,
1018 struct diff_filespec *two,
1019 struct diffstat_t *diffstat,
1020 struct diff_options *o,
1021 int complete_rewrite)
1022 {
1023 mmfile_t mf1, mf2;
1024 struct diffstat_file *data;
1025
1026 data = diffstat_add(diffstat, name_a, name_b);
1027
1028 if (!one || !two) {
1029 data->is_unmerged = 1;
1030 return;
1031 }
1032 if (complete_rewrite) {
1033 diff_populate_filespec(one, 0);
1034 diff_populate_filespec(two, 0);
1035 data->deleted = count_lines(one->data, one->size);
1036 data->added = count_lines(two->data, two->size);
1037 return;
1038 }
1039 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1040 die("unable to read files to diff");
1041
1042 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
1043 data->is_binary = 1;
1044 else {
1045 /* Crazy xdl interfaces.. */
1046 xpparam_t xpp;
1047 xdemitconf_t xecfg;
1048 xdemitcb_t ecb;
1049
1050 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1051 xecfg.ctxlen = 0;
1052 xecfg.flags = 0;
1053 ecb.outf = xdiff_outf;
1054 ecb.priv = diffstat;
1055 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1056 }
1057 }
1058
1059 static void builtin_checkdiff(const char *name_a, const char *name_b,
1060 struct diff_filespec *one,
1061 struct diff_filespec *two)
1062 {
1063 mmfile_t mf1, mf2;
1064 struct checkdiff_t data;
1065
1066 if (!two)
1067 return;
1068
1069 memset(&data, 0, sizeof(data));
1070 data.xm.consume = checkdiff_consume;
1071 data.filename = name_b ? name_b : name_a;
1072 data.lineno = 0;
1073
1074 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1075 die("unable to read files to diff");
1076
1077 if (mmfile_is_binary(&mf2))
1078 return;
1079 else {
1080 /* Crazy xdl interfaces.. */
1081 xpparam_t xpp;
1082 xdemitconf_t xecfg;
1083 xdemitcb_t ecb;
1084
1085 xpp.flags = XDF_NEED_MINIMAL;
1086 xecfg.ctxlen = 0;
1087 xecfg.flags = 0;
1088 ecb.outf = xdiff_outf;
1089 ecb.priv = &data;
1090 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1091 }
1092 }
1093
1094 struct diff_filespec *alloc_filespec(const char *path)
1095 {
1096 int namelen = strlen(path);
1097 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1098
1099 memset(spec, 0, sizeof(*spec));
1100 spec->path = (char *)(spec + 1);
1101 memcpy(spec->path, path, namelen+1);
1102 return spec;
1103 }
1104
1105 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1106 unsigned short mode)
1107 {
1108 if (mode) {
1109 spec->mode = canon_mode(mode);
1110 hashcpy(spec->sha1, sha1);
1111 spec->sha1_valid = !is_null_sha1(sha1);
1112 }
1113 }
1114
1115 /*
1116 * Given a name and sha1 pair, if the dircache tells us the file in
1117 * the work tree has that object contents, return true, so that
1118 * prepare_temp_file() does not have to inflate and extract.
1119 */
1120 static int work_tree_matches(const char *name, const unsigned char *sha1)
1121 {
1122 struct cache_entry *ce;
1123 struct stat st;
1124 int pos, len;
1125
1126 /* We do not read the cache ourselves here, because the
1127 * benchmark with my previous version that always reads cache
1128 * shows that it makes things worse for diff-tree comparing
1129 * two linux-2.6 kernel trees in an already checked out work
1130 * tree. This is because most diff-tree comparisons deal with
1131 * only a small number of files, while reading the cache is
1132 * expensive for a large project, and its cost outweighs the
1133 * savings we get by not inflating the object to a temporary
1134 * file. Practically, this code only helps when we are used
1135 * by diff-cache --cached, which does read the cache before
1136 * calling us.
1137 */
1138 if (!active_cache)
1139 return 0;
1140
1141 len = strlen(name);
1142 pos = cache_name_pos(name, len);
1143 if (pos < 0)
1144 return 0;
1145 ce = active_cache[pos];
1146 if ((lstat(name, &st) < 0) ||
1147 !S_ISREG(st.st_mode) || /* careful! */
1148 ce_match_stat(ce, &st, 0) ||
1149 hashcmp(sha1, ce->sha1))
1150 return 0;
1151 /* we return 1 only when we can stat, it is a regular file,
1152 * stat information matches, and sha1 recorded in the cache
1153 * matches. I.e. we know the file in the work tree really is
1154 * the same as the <name, sha1> pair.
1155 */
1156 return 1;
1157 }
1158
1159 static struct sha1_size_cache {
1160 unsigned char sha1[20];
1161 unsigned long size;
1162 } **sha1_size_cache;
1163 static int sha1_size_cache_nr, sha1_size_cache_alloc;
1164
1165 static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
1166 int find_only,
1167 unsigned long size)
1168 {
1169 int first, last;
1170 struct sha1_size_cache *e;
1171
1172 first = 0;
1173 last = sha1_size_cache_nr;
1174 while (last > first) {
1175 int cmp, next = (last + first) >> 1;
1176 e = sha1_size_cache[next];
1177 cmp = hashcmp(e->sha1, sha1);
1178 if (!cmp)
1179 return e;
1180 if (cmp < 0) {
1181 last = next;
1182 continue;
1183 }
1184 first = next+1;
1185 }
1186 /* not found */
1187 if (find_only)
1188 return NULL;
1189 /* insert to make it at "first" */
1190 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
1191 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
1192 sha1_size_cache = xrealloc(sha1_size_cache,
1193 sha1_size_cache_alloc *
1194 sizeof(*sha1_size_cache));
1195 }
1196 sha1_size_cache_nr++;
1197 if (first < sha1_size_cache_nr)
1198 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
1199 (sha1_size_cache_nr - first - 1) *
1200 sizeof(*sha1_size_cache));
1201 e = xmalloc(sizeof(struct sha1_size_cache));
1202 sha1_size_cache[first] = e;
1203 hashcpy(e->sha1, sha1);
1204 e->size = size;
1205 return e;
1206 }
1207
1208 /*
1209 * While doing rename detection and pickaxe operation, we may need to
1210 * grab the data for the blob (or file) for our own in-core comparison.
1211 * diff_filespec has data and size fields for this purpose.
1212 */
1213 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1214 {
1215 int err = 0;
1216 if (!DIFF_FILE_VALID(s))
1217 die("internal error: asking to populate invalid file.");
1218 if (S_ISDIR(s->mode))
1219 return -1;
1220
1221 if (!use_size_cache)
1222 size_only = 0;
1223
1224 if (s->data)
1225 return err;
1226 if (!s->sha1_valid ||
1227 work_tree_matches(s->path, s->sha1)) {
1228 struct stat st;
1229 int fd;
1230 if (lstat(s->path, &st) < 0) {
1231 if (errno == ENOENT) {
1232 err_empty:
1233 err = -1;
1234 empty:
1235 s->data = (char *)"";
1236 s->size = 0;
1237 return err;
1238 }
1239 }
1240 s->size = st.st_size;
1241 if (!s->size)
1242 goto empty;
1243 if (size_only)
1244 return 0;
1245 if (S_ISLNK(st.st_mode)) {
1246 int ret;
1247 s->data = xmalloc(s->size);
1248 s->should_free = 1;
1249 ret = readlink(s->path, s->data, s->size);
1250 if (ret < 0) {
1251 free(s->data);
1252 goto err_empty;
1253 }
1254 return 0;
1255 }
1256 fd = open(s->path, O_RDONLY);
1257 if (fd < 0)
1258 goto err_empty;
1259 s->data = mmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1260 close(fd);
1261 if (s->data == MAP_FAILED)
1262 goto err_empty;
1263 s->should_munmap = 1;
1264 }
1265 else {
1266 char type[20];
1267 struct sha1_size_cache *e;
1268
1269 if (size_only) {
1270 e = locate_size_cache(s->sha1, 1, 0);
1271 if (e) {
1272 s->size = e->size;
1273 return 0;
1274 }
1275 if (!sha1_object_info(s->sha1, type, &s->size))
1276 locate_size_cache(s->sha1, 0, s->size);
1277 }
1278 else {
1279 s->data = read_sha1_file(s->sha1, type, &s->size);
1280 s->should_free = 1;
1281 }
1282 }
1283 return 0;
1284 }
1285
1286 void diff_free_filespec_data(struct diff_filespec *s)
1287 {
1288 if (s->should_free)
1289 free(s->data);
1290 else if (s->should_munmap)
1291 munmap(s->data, s->size);
1292 s->should_free = s->should_munmap = 0;
1293 s->data = NULL;
1294 free(s->cnt_data);
1295 s->cnt_data = NULL;
1296 }
1297
1298 static void prep_temp_blob(struct diff_tempfile *temp,
1299 void *blob,
1300 unsigned long size,
1301 const unsigned char *sha1,
1302 int mode)
1303 {
1304 int fd;
1305
1306 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
1307 if (fd < 0)
1308 die("unable to create temp-file");
1309 if (write(fd, blob, size) != size)
1310 die("unable to write temp-file");
1311 close(fd);
1312 temp->name = temp->tmp_path;
1313 strcpy(temp->hex, sha1_to_hex(sha1));
1314 temp->hex[40] = 0;
1315 sprintf(temp->mode, "%06o", mode);
1316 }
1317
1318 static void prepare_temp_file(const char *name,
1319 struct diff_tempfile *temp,
1320 struct diff_filespec *one)
1321 {
1322 if (!DIFF_FILE_VALID(one)) {
1323 not_a_valid_file:
1324 /* A '-' entry produces this for file-2, and
1325 * a '+' entry produces this for file-1.
1326 */
1327 temp->name = "/dev/null";
1328 strcpy(temp->hex, ".");
1329 strcpy(temp->mode, ".");
1330 return;
1331 }
1332
1333 if (!one->sha1_valid ||
1334 work_tree_matches(name, one->sha1)) {
1335 struct stat st;
1336 if (lstat(name, &st) < 0) {
1337 if (errno == ENOENT)
1338 goto not_a_valid_file;
1339 die("stat(%s): %s", name, strerror(errno));
1340 }
1341 if (S_ISLNK(st.st_mode)) {
1342 int ret;
1343 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1344 if (sizeof(buf) <= st.st_size)
1345 die("symlink too long: %s", name);
1346 ret = readlink(name, buf, st.st_size);
1347 if (ret < 0)
1348 die("readlink(%s)", name);
1349 prep_temp_blob(temp, buf, st.st_size,
1350 (one->sha1_valid ?
1351 one->sha1 : null_sha1),
1352 (one->sha1_valid ?
1353 one->mode : S_IFLNK));
1354 }
1355 else {
1356 /* we can borrow from the file in the work tree */
1357 temp->name = name;
1358 if (!one->sha1_valid)
1359 strcpy(temp->hex, sha1_to_hex(null_sha1));
1360 else
1361 strcpy(temp->hex, sha1_to_hex(one->sha1));
1362 /* Even though we may sometimes borrow the
1363 * contents from the work tree, we always want
1364 * one->mode. mode is trustworthy even when
1365 * !(one->sha1_valid), as long as
1366 * DIFF_FILE_VALID(one).
1367 */
1368 sprintf(temp->mode, "%06o", one->mode);
1369 }
1370 return;
1371 }
1372 else {
1373 if (diff_populate_filespec(one, 0))
1374 die("cannot read data blob for %s", one->path);
1375 prep_temp_blob(temp, one->data, one->size,
1376 one->sha1, one->mode);
1377 }
1378 }
1379
1380 static void remove_tempfile(void)
1381 {
1382 int i;
1383
1384 for (i = 0; i < 2; i++)
1385 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1386 unlink(diff_temp[i].name);
1387 diff_temp[i].name = NULL;
1388 }
1389 }
1390
1391 static void remove_tempfile_on_signal(int signo)
1392 {
1393 remove_tempfile();
1394 signal(SIGINT, SIG_DFL);
1395 raise(signo);
1396 }
1397
1398 static int spawn_prog(const char *pgm, const char **arg)
1399 {
1400 pid_t pid;
1401 int status;
1402
1403 fflush(NULL);
1404 pid = fork();
1405 if (pid < 0)
1406 die("unable to fork");
1407 if (!pid) {
1408 execvp(pgm, (char *const*) arg);
1409 exit(255);
1410 }
1411
1412 while (waitpid(pid, &status, 0) < 0) {
1413 if (errno == EINTR)
1414 continue;
1415 return -1;
1416 }
1417
1418 /* Earlier we did not check the exit status because
1419 * diff exits non-zero if files are different, and
1420 * we are not interested in knowing that. It was a
1421 * mistake which made it harder to quit a diff-*
1422 * session that uses the git-apply-patch-script as
1423 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1424 * should also exit non-zero only when it wants to
1425 * abort the entire diff-* session.
1426 */
1427 if (WIFEXITED(status) && !WEXITSTATUS(status))
1428 return 0;
1429 return -1;
1430 }
1431
1432 /* An external diff command takes:
1433 *
1434 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1435 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1436 *
1437 */
1438 static void run_external_diff(const char *pgm,
1439 const char *name,
1440 const char *other,
1441 struct diff_filespec *one,
1442 struct diff_filespec *two,
1443 const char *xfrm_msg,
1444 int complete_rewrite)
1445 {
1446 const char *spawn_arg[10];
1447 struct diff_tempfile *temp = diff_temp;
1448 int retval;
1449 static int atexit_asked = 0;
1450 const char *othername;
1451 const char **arg = &spawn_arg[0];
1452
1453 othername = (other? other : name);
1454 if (one && two) {
1455 prepare_temp_file(name, &temp[0], one);
1456 prepare_temp_file(othername, &temp[1], two);
1457 if (! atexit_asked &&
1458 (temp[0].name == temp[0].tmp_path ||
1459 temp[1].name == temp[1].tmp_path)) {
1460 atexit_asked = 1;
1461 atexit(remove_tempfile);
1462 }
1463 signal(SIGINT, remove_tempfile_on_signal);
1464 }
1465
1466 if (one && two) {
1467 *arg++ = pgm;
1468 *arg++ = name;
1469 *arg++ = temp[0].name;
1470 *arg++ = temp[0].hex;
1471 *arg++ = temp[0].mode;
1472 *arg++ = temp[1].name;
1473 *arg++ = temp[1].hex;
1474 *arg++ = temp[1].mode;
1475 if (other) {
1476 *arg++ = other;
1477 *arg++ = xfrm_msg;
1478 }
1479 } else {
1480 *arg++ = pgm;
1481 *arg++ = name;
1482 }
1483 *arg = NULL;
1484 retval = spawn_prog(pgm, spawn_arg);
1485 remove_tempfile();
1486 if (retval) {
1487 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1488 exit(1);
1489 }
1490 }
1491
1492 static void run_diff_cmd(const char *pgm,
1493 const char *name,
1494 const char *other,
1495 struct diff_filespec *one,
1496 struct diff_filespec *two,
1497 const char *xfrm_msg,
1498 struct diff_options *o,
1499 int complete_rewrite)
1500 {
1501 if (pgm) {
1502 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1503 complete_rewrite);
1504 return;
1505 }
1506 if (one && two)
1507 builtin_diff(name, other ? other : name,
1508 one, two, xfrm_msg, o, complete_rewrite);
1509 else
1510 printf("* Unmerged path %s\n", name);
1511 }
1512
1513 static void diff_fill_sha1_info(struct diff_filespec *one)
1514 {
1515 if (DIFF_FILE_VALID(one)) {
1516 if (!one->sha1_valid) {
1517 struct stat st;
1518 if (lstat(one->path, &st) < 0)
1519 die("stat %s", one->path);
1520 if (index_path(one->sha1, one->path, &st, 0))
1521 die("cannot hash %s\n", one->path);
1522 }
1523 }
1524 else
1525 hashclr(one->sha1);
1526 }
1527
1528 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1529 {
1530 const char *pgm = external_diff();
1531 char msg[PATH_MAX*2+300], *xfrm_msg;
1532 struct diff_filespec *one;
1533 struct diff_filespec *two;
1534 const char *name;
1535 const char *other;
1536 char *name_munged, *other_munged;
1537 int complete_rewrite = 0;
1538 int len;
1539
1540 if (DIFF_PAIR_UNMERGED(p)) {
1541 /* unmerged */
1542 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1543 return;
1544 }
1545
1546 name = p->one->path;
1547 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1548 name_munged = quote_one(name);
1549 other_munged = quote_one(other);
1550 one = p->one; two = p->two;
1551
1552 diff_fill_sha1_info(one);
1553 diff_fill_sha1_info(two);
1554
1555 len = 0;
1556 switch (p->status) {
1557 case DIFF_STATUS_COPIED:
1558 len += snprintf(msg + len, sizeof(msg) - len,
1559 "similarity index %d%%\n"
1560 "copy from %s\n"
1561 "copy to %s\n",
1562 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1563 name_munged, other_munged);
1564 break;
1565 case DIFF_STATUS_RENAMED:
1566 len += snprintf(msg + len, sizeof(msg) - len,
1567 "similarity index %d%%\n"
1568 "rename from %s\n"
1569 "rename to %s\n",
1570 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1571 name_munged, other_munged);
1572 break;
1573 case DIFF_STATUS_MODIFIED:
1574 if (p->score) {
1575 len += snprintf(msg + len, sizeof(msg) - len,
1576 "dissimilarity index %d%%\n",
1577 (int)(0.5 + p->score *
1578 100.0/MAX_SCORE));
1579 complete_rewrite = 1;
1580 break;
1581 }
1582 /* fallthru */
1583 default:
1584 /* nothing */
1585 ;
1586 }
1587
1588 if (hashcmp(one->sha1, two->sha1)) {
1589 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1590
1591 len += snprintf(msg + len, sizeof(msg) - len,
1592 "index %.*s..%.*s",
1593 abbrev, sha1_to_hex(one->sha1),
1594 abbrev, sha1_to_hex(two->sha1));
1595 if (one->mode == two->mode)
1596 len += snprintf(msg + len, sizeof(msg) - len,
1597 " %06o", one->mode);
1598 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1599 }
1600
1601 if (len)
1602 msg[--len] = 0;
1603 xfrm_msg = len ? msg : NULL;
1604
1605 if (!pgm &&
1606 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1607 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1608 /* a filepair that changes between file and symlink
1609 * needs to be split into deletion and creation.
1610 */
1611 struct diff_filespec *null = alloc_filespec(two->path);
1612 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1613 free(null);
1614 null = alloc_filespec(one->path);
1615 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1616 free(null);
1617 }
1618 else
1619 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1620 complete_rewrite);
1621
1622 free(name_munged);
1623 free(other_munged);
1624 }
1625
1626 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1627 struct diffstat_t *diffstat)
1628 {
1629 const char *name;
1630 const char *other;
1631 int complete_rewrite = 0;
1632
1633 if (DIFF_PAIR_UNMERGED(p)) {
1634 /* unmerged */
1635 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1636 return;
1637 }
1638
1639 name = p->one->path;
1640 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1641
1642 diff_fill_sha1_info(p->one);
1643 diff_fill_sha1_info(p->two);
1644
1645 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1646 complete_rewrite = 1;
1647 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
1648 }
1649
1650 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1651 {
1652 const char *name;
1653 const char *other;
1654
1655 if (DIFF_PAIR_UNMERGED(p)) {
1656 /* unmerged */
1657 return;
1658 }
1659
1660 name = p->one->path;
1661 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1662
1663 diff_fill_sha1_info(p->one);
1664 diff_fill_sha1_info(p->two);
1665
1666 builtin_checkdiff(name, other, p->one, p->two);
1667 }
1668
1669 void diff_setup(struct diff_options *options)
1670 {
1671 memset(options, 0, sizeof(*options));
1672 options->line_termination = '\n';
1673 options->break_opt = -1;
1674 options->rename_limit = -1;
1675 options->context = 3;
1676 options->msg_sep = "";
1677
1678 options->change = diff_change;
1679 options->add_remove = diff_addremove;
1680 options->color_diff = diff_use_color_default;
1681 options->detect_rename = diff_detect_rename_default;
1682 }
1683
1684 int diff_setup_done(struct diff_options *options)
1685 {
1686 int count = 0;
1687
1688 if (options->output_format & DIFF_FORMAT_NAME)
1689 count++;
1690 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
1691 count++;
1692 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
1693 count++;
1694 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
1695 count++;
1696 if (count > 1)
1697 die("--name-only, --name-status, --check and -s are mutually exclusive");
1698
1699 if (options->find_copies_harder)
1700 options->detect_rename = DIFF_DETECT_COPY;
1701
1702 if (options->output_format & (DIFF_FORMAT_NAME |
1703 DIFF_FORMAT_NAME_STATUS |
1704 DIFF_FORMAT_CHECKDIFF |
1705 DIFF_FORMAT_NO_OUTPUT))
1706 options->output_format &= ~(DIFF_FORMAT_RAW |
1707 DIFF_FORMAT_DIFFSTAT |
1708 DIFF_FORMAT_SUMMARY |
1709 DIFF_FORMAT_PATCH);
1710
1711 /*
1712 * These cases always need recursive; we do not drop caller-supplied
1713 * recursive bits for other formats here.
1714 */
1715 if (options->output_format & (DIFF_FORMAT_PATCH |
1716 DIFF_FORMAT_DIFFSTAT |
1717 DIFF_FORMAT_CHECKDIFF))
1718 options->recursive = 1;
1719 /*
1720 * Also pickaxe would not work very well if you do not say recursive
1721 */
1722 if (options->pickaxe)
1723 options->recursive = 1;
1724
1725 if (options->detect_rename && options->rename_limit < 0)
1726 options->rename_limit = diff_rename_limit_default;
1727 if (options->setup & DIFF_SETUP_USE_CACHE) {
1728 if (!active_cache)
1729 /* read-cache does not die even when it fails
1730 * so it is safe for us to do this here. Also
1731 * it does not smudge active_cache or active_nr
1732 * when it fails, so we do not have to worry about
1733 * cleaning it up ourselves either.
1734 */
1735 read_cache();
1736 }
1737 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
1738 use_size_cache = 1;
1739 if (options->abbrev <= 0 || 40 < options->abbrev)
1740 options->abbrev = 40; /* full */
1741
1742 return 0;
1743 }
1744
1745 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
1746 {
1747 char c, *eq;
1748 int len;
1749
1750 if (*arg != '-')
1751 return 0;
1752 c = *++arg;
1753 if (!c)
1754 return 0;
1755 if (c == arg_short) {
1756 c = *++arg;
1757 if (!c)
1758 return 1;
1759 if (val && isdigit(c)) {
1760 char *end;
1761 int n = strtoul(arg, &end, 10);
1762 if (*end)
1763 return 0;
1764 *val = n;
1765 return 1;
1766 }
1767 return 0;
1768 }
1769 if (c != '-')
1770 return 0;
1771 arg++;
1772 eq = strchr(arg, '=');
1773 if (eq)
1774 len = eq - arg;
1775 else
1776 len = strlen(arg);
1777 if (!len || strncmp(arg, arg_long, len))
1778 return 0;
1779 if (eq) {
1780 int n;
1781 char *end;
1782 if (!isdigit(*++eq))
1783 return 0;
1784 n = strtoul(eq, &end, 10);
1785 if (*end)
1786 return 0;
1787 *val = n;
1788 }
1789 return 1;
1790 }
1791
1792 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
1793 {
1794 const char *arg = av[0];
1795 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
1796 options->output_format |= DIFF_FORMAT_PATCH;
1797 else if (opt_arg(arg, 'U', "unified", &options->context))
1798 options->output_format |= DIFF_FORMAT_PATCH;
1799 else if (!strcmp(arg, "--raw"))
1800 options->output_format |= DIFF_FORMAT_RAW;
1801 else if (!strcmp(arg, "--patch-with-raw")) {
1802 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
1803 }
1804 else if (!strcmp(arg, "--stat"))
1805 options->output_format |= DIFF_FORMAT_DIFFSTAT;
1806 else if (!strcmp(arg, "--check"))
1807 options->output_format |= DIFF_FORMAT_CHECKDIFF;
1808 else if (!strcmp(arg, "--summary"))
1809 options->output_format |= DIFF_FORMAT_SUMMARY;
1810 else if (!strcmp(arg, "--patch-with-stat")) {
1811 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
1812 }
1813 else if (!strcmp(arg, "-z"))
1814 options->line_termination = 0;
1815 else if (!strncmp(arg, "-l", 2))
1816 options->rename_limit = strtoul(arg+2, NULL, 10);
1817 else if (!strcmp(arg, "--full-index"))
1818 options->full_index = 1;
1819 else if (!strcmp(arg, "--binary")) {
1820 options->output_format |= DIFF_FORMAT_PATCH;
1821 options->full_index = options->binary = 1;
1822 }
1823 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
1824 options->text = 1;
1825 }
1826 else if (!strcmp(arg, "--name-only"))
1827 options->output_format |= DIFF_FORMAT_NAME;
1828 else if (!strcmp(arg, "--name-status"))
1829 options->output_format |= DIFF_FORMAT_NAME_STATUS;
1830 else if (!strcmp(arg, "-R"))
1831 options->reverse_diff = 1;
1832 else if (!strncmp(arg, "-S", 2))
1833 options->pickaxe = arg + 2;
1834 else if (!strcmp(arg, "-s")) {
1835 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
1836 }
1837 else if (!strncmp(arg, "-O", 2))
1838 options->orderfile = arg + 2;
1839 else if (!strncmp(arg, "--diff-filter=", 14))
1840 options->filter = arg + 14;
1841 else if (!strcmp(arg, "--pickaxe-all"))
1842 options->pickaxe_opts = DIFF_PICKAXE_ALL;
1843 else if (!strcmp(arg, "--pickaxe-regex"))
1844 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
1845 else if (!strncmp(arg, "-B", 2)) {
1846 if ((options->break_opt =
1847 diff_scoreopt_parse(arg)) == -1)
1848 return -1;
1849 }
1850 else if (!strncmp(arg, "-M", 2)) {
1851 if ((options->rename_score =
1852 diff_scoreopt_parse(arg)) == -1)
1853 return -1;
1854 options->detect_rename = DIFF_DETECT_RENAME;
1855 }
1856 else if (!strncmp(arg, "-C", 2)) {
1857 if ((options->rename_score =
1858 diff_scoreopt_parse(arg)) == -1)
1859 return -1;
1860 options->detect_rename = DIFF_DETECT_COPY;
1861 }
1862 else if (!strcmp(arg, "--find-copies-harder"))
1863 options->find_copies_harder = 1;
1864 else if (!strcmp(arg, "--abbrev"))
1865 options->abbrev = DEFAULT_ABBREV;
1866 else if (!strncmp(arg, "--abbrev=", 9)) {
1867 options->abbrev = strtoul(arg + 9, NULL, 10);
1868 if (options->abbrev < MINIMUM_ABBREV)
1869 options->abbrev = MINIMUM_ABBREV;
1870 else if (40 < options->abbrev)
1871 options->abbrev = 40;
1872 }
1873 else if (!strcmp(arg, "--color"))
1874 options->color_diff = 1;
1875 else if (!strcmp(arg, "--no-color"))
1876 options->color_diff = 0;
1877 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
1878 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
1879 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
1880 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
1881 else if (!strcmp(arg, "--color-words"))
1882 options->color_diff = options->color_diff_words = 1;
1883 else if (!strcmp(arg, "--no-renames"))
1884 options->detect_rename = 0;
1885 else
1886 return 0;
1887 return 1;
1888 }
1889
1890 static int parse_num(const char **cp_p)
1891 {
1892 unsigned long num, scale;
1893 int ch, dot;
1894 const char *cp = *cp_p;
1895
1896 num = 0;
1897 scale = 1;
1898 dot = 0;
1899 for(;;) {
1900 ch = *cp;
1901 if ( !dot && ch == '.' ) {
1902 scale = 1;
1903 dot = 1;
1904 } else if ( ch == '%' ) {
1905 scale = dot ? scale*100 : 100;
1906 cp++; /* % is always at the end */
1907 break;
1908 } else if ( ch >= '0' && ch <= '9' ) {
1909 if ( scale < 100000 ) {
1910 scale *= 10;
1911 num = (num*10) + (ch-'0');
1912 }
1913 } else {
1914 break;
1915 }
1916 cp++;
1917 }
1918 *cp_p = cp;
1919
1920 /* user says num divided by scale and we say internally that
1921 * is MAX_SCORE * num / scale.
1922 */
1923 return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
1924 }
1925
1926 int diff_scoreopt_parse(const char *opt)
1927 {
1928 int opt1, opt2, cmd;
1929
1930 if (*opt++ != '-')
1931 return -1;
1932 cmd = *opt++;
1933 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
1934 return -1; /* that is not a -M, -C nor -B option */
1935
1936 opt1 = parse_num(&opt);
1937 if (cmd != 'B')
1938 opt2 = 0;
1939 else {
1940 if (*opt == 0)
1941 opt2 = 0;
1942 else if (*opt != '/')
1943 return -1; /* we expect -B80/99 or -B80 */
1944 else {
1945 opt++;
1946 opt2 = parse_num(&opt);
1947 }
1948 }
1949 if (*opt != 0)
1950 return -1;
1951 return opt1 | (opt2 << 16);
1952 }
1953
1954 struct diff_queue_struct diff_queued_diff;
1955
1956 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
1957 {
1958 if (queue->alloc <= queue->nr) {
1959 queue->alloc = alloc_nr(queue->alloc);
1960 queue->queue = xrealloc(queue->queue,
1961 sizeof(dp) * queue->alloc);
1962 }
1963 queue->queue[queue->nr++] = dp;
1964 }
1965
1966 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
1967 struct diff_filespec *one,
1968 struct diff_filespec *two)
1969 {
1970 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
1971 dp->one = one;
1972 dp->two = two;
1973 if (queue)
1974 diff_q(queue, dp);
1975 return dp;
1976 }
1977
1978 void diff_free_filepair(struct diff_filepair *p)
1979 {
1980 diff_free_filespec_data(p->one);
1981 diff_free_filespec_data(p->two);
1982 free(p->one);
1983 free(p->two);
1984 free(p);
1985 }
1986
1987 /* This is different from find_unique_abbrev() in that
1988 * it stuffs the result with dots for alignment.
1989 */
1990 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
1991 {
1992 int abblen;
1993 const char *abbrev;
1994 if (len == 40)
1995 return sha1_to_hex(sha1);
1996
1997 abbrev = find_unique_abbrev(sha1, len);
1998 if (!abbrev)
1999 return sha1_to_hex(sha1);
2000 abblen = strlen(abbrev);
2001 if (abblen < 37) {
2002 static char hex[41];
2003 if (len < abblen && abblen <= len + 2)
2004 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2005 else
2006 sprintf(hex, "%s...", abbrev);
2007 return hex;
2008 }
2009 return sha1_to_hex(sha1);
2010 }
2011
2012 static void diff_flush_raw(struct diff_filepair *p,
2013 struct diff_options *options)
2014 {
2015 int two_paths;
2016 char status[10];
2017 int abbrev = options->abbrev;
2018 const char *path_one, *path_two;
2019 int inter_name_termination = '\t';
2020 int line_termination = options->line_termination;
2021
2022 if (!line_termination)
2023 inter_name_termination = 0;
2024
2025 path_one = p->one->path;
2026 path_two = p->two->path;
2027 if (line_termination) {
2028 path_one = quote_one(path_one);
2029 path_two = quote_one(path_two);
2030 }
2031
2032 if (p->score)
2033 sprintf(status, "%c%03d", p->status,
2034 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2035 else {
2036 status[0] = p->status;
2037 status[1] = 0;
2038 }
2039 switch (p->status) {
2040 case DIFF_STATUS_COPIED:
2041 case DIFF_STATUS_RENAMED:
2042 two_paths = 1;
2043 break;
2044 case DIFF_STATUS_ADDED:
2045 case DIFF_STATUS_DELETED:
2046 two_paths = 0;
2047 break;
2048 default:
2049 two_paths = 0;
2050 break;
2051 }
2052 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
2053 printf(":%06o %06o %s ",
2054 p->one->mode, p->two->mode,
2055 diff_unique_abbrev(p->one->sha1, abbrev));
2056 printf("%s ",
2057 diff_unique_abbrev(p->two->sha1, abbrev));
2058 }
2059 printf("%s%c%s", status, inter_name_termination, path_one);
2060 if (two_paths)
2061 printf("%c%s", inter_name_termination, path_two);
2062 putchar(line_termination);
2063 if (path_one != p->one->path)
2064 free((void*)path_one);
2065 if (path_two != p->two->path)
2066 free((void*)path_two);
2067 }
2068
2069 static void diff_flush_name(struct diff_filepair *p, int line_termination)
2070 {
2071 char *path = p->two->path;
2072
2073 if (line_termination)
2074 path = quote_one(p->two->path);
2075 printf("%s%c", path, line_termination);
2076 if (p->two->path != path)
2077 free(path);
2078 }
2079
2080 int diff_unmodified_pair(struct diff_filepair *p)
2081 {
2082 /* This function is written stricter than necessary to support
2083 * the currently implemented transformers, but the idea is to
2084 * let transformers to produce diff_filepairs any way they want,
2085 * and filter and clean them up here before producing the output.
2086 */
2087 struct diff_filespec *one, *two;
2088
2089 if (DIFF_PAIR_UNMERGED(p))
2090 return 0; /* unmerged is interesting */
2091
2092 one = p->one;
2093 two = p->two;
2094
2095 /* deletion, addition, mode or type change
2096 * and rename are all interesting.
2097 */
2098 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2099 DIFF_PAIR_MODE_CHANGED(p) ||
2100 strcmp(one->path, two->path))
2101 return 0;
2102
2103 /* both are valid and point at the same path. that is, we are
2104 * dealing with a change.
2105 */
2106 if (one->sha1_valid && two->sha1_valid &&
2107 !hashcmp(one->sha1, two->sha1))
2108 return 1; /* no change */
2109 if (!one->sha1_valid && !two->sha1_valid)
2110 return 1; /* both look at the same file on the filesystem. */
2111 return 0;
2112 }
2113
2114 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2115 {
2116 if (diff_unmodified_pair(p))
2117 return;
2118
2119 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2120 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2121 return; /* no tree diffs in patch format */
2122
2123 run_diff(p, o);
2124 }
2125
2126 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2127 struct diffstat_t *diffstat)
2128 {
2129 if (diff_unmodified_pair(p))
2130 return;
2131
2132 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2133 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2134 return; /* no tree diffs in patch format */
2135
2136 run_diffstat(p, o, diffstat);
2137 }
2138
2139 static void diff_flush_checkdiff(struct diff_filepair *p,
2140 struct diff_options *o)
2141 {
2142 if (diff_unmodified_pair(p))
2143 return;
2144
2145 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2146 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2147 return; /* no tree diffs in patch format */
2148
2149 run_checkdiff(p, o);
2150 }
2151
2152 int diff_queue_is_empty(void)
2153 {
2154 struct diff_queue_struct *q = &diff_queued_diff;
2155 int i;
2156 for (i = 0; i < q->nr; i++)
2157 if (!diff_unmodified_pair(q->queue[i]))
2158 return 0;
2159 return 1;
2160 }
2161
2162 #if DIFF_DEBUG
2163 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2164 {
2165 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2166 x, one ? one : "",
2167 s->path,
2168 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2169 s->mode,
2170 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2171 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2172 x, one ? one : "",
2173 s->size, s->xfrm_flags);
2174 }
2175
2176 void diff_debug_filepair(const struct diff_filepair *p, int i)
2177 {
2178 diff_debug_filespec(p->one, i, "one");
2179 diff_debug_filespec(p->two, i, "two");
2180 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2181 p->score, p->status ? p->status : '?',
2182 p->source_stays, p->broken_pair);
2183 }
2184
2185 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2186 {
2187 int i;
2188 if (msg)
2189 fprintf(stderr, "%s\n", msg);
2190 fprintf(stderr, "q->nr = %d\n", q->nr);
2191 for (i = 0; i < q->nr; i++) {
2192 struct diff_filepair *p = q->queue[i];
2193 diff_debug_filepair(p, i);
2194 }
2195 }
2196 #endif
2197
2198 static void diff_resolve_rename_copy(void)
2199 {
2200 int i, j;
2201 struct diff_filepair *p, *pp;
2202 struct diff_queue_struct *q = &diff_queued_diff;
2203
2204 diff_debug_queue("resolve-rename-copy", q);
2205
2206 for (i = 0; i < q->nr; i++) {
2207 p = q->queue[i];
2208 p->status = 0; /* undecided */
2209 if (DIFF_PAIR_UNMERGED(p))
2210 p->status = DIFF_STATUS_UNMERGED;
2211 else if (!DIFF_FILE_VALID(p->one))
2212 p->status = DIFF_STATUS_ADDED;
2213 else if (!DIFF_FILE_VALID(p->two))
2214 p->status = DIFF_STATUS_DELETED;
2215 else if (DIFF_PAIR_TYPE_CHANGED(p))
2216 p->status = DIFF_STATUS_TYPE_CHANGED;
2217
2218 /* from this point on, we are dealing with a pair
2219 * whose both sides are valid and of the same type, i.e.
2220 * either in-place edit or rename/copy edit.
2221 */
2222 else if (DIFF_PAIR_RENAME(p)) {
2223 if (p->source_stays) {
2224 p->status = DIFF_STATUS_COPIED;
2225 continue;
2226 }
2227 /* See if there is some other filepair that
2228 * copies from the same source as us. If so
2229 * we are a copy. Otherwise we are either a
2230 * copy if the path stays, or a rename if it
2231 * does not, but we already handled "stays" case.
2232 */
2233 for (j = i + 1; j < q->nr; j++) {
2234 pp = q->queue[j];
2235 if (strcmp(pp->one->path, p->one->path))
2236 continue; /* not us */
2237 if (!DIFF_PAIR_RENAME(pp))
2238 continue; /* not a rename/copy */
2239 /* pp is a rename/copy from the same source */
2240 p->status = DIFF_STATUS_COPIED;
2241 break;
2242 }
2243 if (!p->status)
2244 p->status = DIFF_STATUS_RENAMED;
2245 }
2246 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2247 p->one->mode != p->two->mode)
2248 p->status = DIFF_STATUS_MODIFIED;
2249 else {
2250 /* This is a "no-change" entry and should not
2251 * happen anymore, but prepare for broken callers.
2252 */
2253 error("feeding unmodified %s to diffcore",
2254 p->one->path);
2255 p->status = DIFF_STATUS_UNKNOWN;
2256 }
2257 }
2258 diff_debug_queue("resolve-rename-copy done", q);
2259 }
2260
2261 static int check_pair_status(struct diff_filepair *p)
2262 {
2263 switch (p->status) {
2264 case DIFF_STATUS_UNKNOWN:
2265 return 0;
2266 case 0:
2267 die("internal error in diff-resolve-rename-copy");
2268 default:
2269 return 1;
2270 }
2271 }
2272
2273 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2274 {
2275 int fmt = opt->output_format;
2276
2277 if (fmt & DIFF_FORMAT_CHECKDIFF)
2278 diff_flush_checkdiff(p, opt);
2279 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2280 diff_flush_raw(p, opt);
2281 else if (fmt & DIFF_FORMAT_NAME)
2282 diff_flush_name(p, opt->line_termination);
2283 }
2284
2285 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2286 {
2287 if (fs->mode)
2288 printf(" %s mode %06o %s\n", newdelete, fs->mode, fs->path);
2289 else
2290 printf(" %s %s\n", newdelete, fs->path);
2291 }
2292
2293
2294 static void show_mode_change(struct diff_filepair *p, int show_name)
2295 {
2296 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2297 if (show_name)
2298 printf(" mode change %06o => %06o %s\n",
2299 p->one->mode, p->two->mode, p->two->path);
2300 else
2301 printf(" mode change %06o => %06o\n",
2302 p->one->mode, p->two->mode);
2303 }
2304 }
2305
2306 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2307 {
2308 const char *old, *new;
2309
2310 /* Find common prefix */
2311 old = p->one->path;
2312 new = p->two->path;
2313 while (1) {
2314 const char *slash_old, *slash_new;
2315 slash_old = strchr(old, '/');
2316 slash_new = strchr(new, '/');
2317 if (!slash_old ||
2318 !slash_new ||
2319 slash_old - old != slash_new - new ||
2320 memcmp(old, new, slash_new - new))
2321 break;
2322 old = slash_old + 1;
2323 new = slash_new + 1;
2324 }
2325 /* p->one->path thru old is the common prefix, and old and new
2326 * through the end of names are renames
2327 */
2328 if (old != p->one->path)
2329 printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
2330 (int)(old - p->one->path), p->one->path,
2331 old, new, (int)(0.5 + p->score * 100.0/MAX_SCORE));
2332 else
2333 printf(" %s %s => %s (%d%%)\n", renamecopy,
2334 p->one->path, p->two->path,
2335 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2336 show_mode_change(p, 0);
2337 }
2338
2339 static void diff_summary(struct diff_filepair *p)
2340 {
2341 switch(p->status) {
2342 case DIFF_STATUS_DELETED:
2343 show_file_mode_name("delete", p->one);
2344 break;
2345 case DIFF_STATUS_ADDED:
2346 show_file_mode_name("create", p->two);
2347 break;
2348 case DIFF_STATUS_COPIED:
2349 show_rename_copy("copy", p);
2350 break;
2351 case DIFF_STATUS_RENAMED:
2352 show_rename_copy("rename", p);
2353 break;
2354 default:
2355 if (p->score) {
2356 printf(" rewrite %s (%d%%)\n", p->two->path,
2357 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2358 show_mode_change(p, 0);
2359 } else show_mode_change(p, 1);
2360 break;
2361 }
2362 }
2363
2364 struct patch_id_t {
2365 struct xdiff_emit_state xm;
2366 SHA_CTX *ctx;
2367 int patchlen;
2368 };
2369
2370 static int remove_space(char *line, int len)
2371 {
2372 int i;
2373 char *dst = line;
2374 unsigned char c;
2375
2376 for (i = 0; i < len; i++)
2377 if (!isspace((c = line[i])))
2378 *dst++ = c;
2379
2380 return dst - line;
2381 }
2382
2383 static void patch_id_consume(void *priv, char *line, unsigned long len)
2384 {
2385 struct patch_id_t *data = priv;
2386 int new_len;
2387
2388 /* Ignore line numbers when computing the SHA1 of the patch */
2389 if (!strncmp(line, "@@ -", 4))
2390 return;
2391
2392 new_len = remove_space(line, len);
2393
2394 SHA1_Update(data->ctx, line, new_len);
2395 data->patchlen += new_len;
2396 }
2397
2398 /* returns 0 upon success, and writes result into sha1 */
2399 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2400 {
2401 struct diff_queue_struct *q = &diff_queued_diff;
2402 int i;
2403 SHA_CTX ctx;
2404 struct patch_id_t data;
2405 char buffer[PATH_MAX * 4 + 20];
2406
2407 SHA1_Init(&ctx);
2408 memset(&data, 0, sizeof(struct patch_id_t));
2409 data.ctx = &ctx;
2410 data.xm.consume = patch_id_consume;
2411
2412 for (i = 0; i < q->nr; i++) {
2413 xpparam_t xpp;
2414 xdemitconf_t xecfg;
2415 xdemitcb_t ecb;
2416 mmfile_t mf1, mf2;
2417 struct diff_filepair *p = q->queue[i];
2418 int len1, len2;
2419
2420 if (p->status == 0)
2421 return error("internal diff status error");
2422 if (p->status == DIFF_STATUS_UNKNOWN)
2423 continue;
2424 if (diff_unmodified_pair(p))
2425 continue;
2426 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2427 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2428 continue;
2429 if (DIFF_PAIR_UNMERGED(p))
2430 continue;
2431
2432 diff_fill_sha1_info(p->one);
2433 diff_fill_sha1_info(p->two);
2434 if (fill_mmfile(&mf1, p->one) < 0 ||
2435 fill_mmfile(&mf2, p->two) < 0)
2436 return error("unable to read files to diff");
2437
2438 /* Maybe hash p->two? into the patch id? */
2439 if (mmfile_is_binary(&mf2))
2440 continue;
2441
2442 len1 = remove_space(p->one->path, strlen(p->one->path));
2443 len2 = remove_space(p->two->path, strlen(p->two->path));
2444 if (p->one->mode == 0)
2445 len1 = snprintf(buffer, sizeof(buffer),
2446 "diff--gita/%.*sb/%.*s"
2447 "newfilemode%06o"
2448 "---/dev/null"
2449 "+++b/%.*s",
2450 len1, p->one->path,
2451 len2, p->two->path,
2452 p->two->mode,
2453 len2, p->two->path);
2454 else if (p->two->mode == 0)
2455 len1 = snprintf(buffer, sizeof(buffer),
2456 "diff--gita/%.*sb/%.*s"
2457 "deletedfilemode%06o"
2458 "---a/%.*s"
2459 "+++/dev/null",
2460 len1, p->one->path,
2461 len2, p->two->path,
2462 p->one->mode,
2463 len1, p->one->path);
2464 else
2465 len1 = snprintf(buffer, sizeof(buffer),
2466 "diff--gita/%.*sb/%.*s"
2467 "---a/%.*s"
2468 "+++b/%.*s",
2469 len1, p->one->path,
2470 len2, p->two->path,
2471 len1, p->one->path,
2472 len2, p->two->path);
2473 SHA1_Update(&ctx, buffer, len1);
2474
2475 xpp.flags = XDF_NEED_MINIMAL;
2476 xecfg.ctxlen = 3;
2477 xecfg.flags = XDL_EMIT_FUNCNAMES;
2478 ecb.outf = xdiff_outf;
2479 ecb.priv = &data;
2480 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2481 }
2482
2483 SHA1_Final(sha1, &ctx);
2484 return 0;
2485 }
2486
2487 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2488 {
2489 struct diff_queue_struct *q = &diff_queued_diff;
2490 int i;
2491 int result = diff_get_patch_id(options, sha1);
2492
2493 for (i = 0; i < q->nr; i++)
2494 diff_free_filepair(q->queue[i]);
2495
2496 free(q->queue);
2497 q->queue = NULL;
2498 q->nr = q->alloc = 0;
2499
2500 return result;
2501 }
2502
2503 static int is_summary_empty(const struct diff_queue_struct *q)
2504 {
2505 int i;
2506
2507 for (i = 0; i < q->nr; i++) {
2508 const struct diff_filepair *p = q->queue[i];
2509
2510 switch (p->status) {
2511 case DIFF_STATUS_DELETED:
2512 case DIFF_STATUS_ADDED:
2513 case DIFF_STATUS_COPIED:
2514 case DIFF_STATUS_RENAMED:
2515 return 0;
2516 default:
2517 if (p->score)
2518 return 0;
2519 if (p->one->mode && p->two->mode &&
2520 p->one->mode != p->two->mode)
2521 return 0;
2522 break;
2523 }
2524 }
2525 return 1;
2526 }
2527
2528 void diff_flush(struct diff_options *options)
2529 {
2530 struct diff_queue_struct *q = &diff_queued_diff;
2531 int i, output_format = options->output_format;
2532 int separator = 0;
2533
2534 /*
2535 * Order: raw, stat, summary, patch
2536 * or: name/name-status/checkdiff (other bits clear)
2537 */
2538 if (!q->nr)
2539 goto free_queue;
2540
2541 if (output_format & (DIFF_FORMAT_RAW |
2542 DIFF_FORMAT_NAME |
2543 DIFF_FORMAT_NAME_STATUS |
2544 DIFF_FORMAT_CHECKDIFF)) {
2545 for (i = 0; i < q->nr; i++) {
2546 struct diff_filepair *p = q->queue[i];
2547 if (check_pair_status(p))
2548 flush_one_pair(p, options);
2549 }
2550 separator++;
2551 }
2552
2553 if (output_format & DIFF_FORMAT_DIFFSTAT) {
2554 struct diffstat_t diffstat;
2555
2556 memset(&diffstat, 0, sizeof(struct diffstat_t));
2557 diffstat.xm.consume = diffstat_consume;
2558 for (i = 0; i < q->nr; i++) {
2559 struct diff_filepair *p = q->queue[i];
2560 if (check_pair_status(p))
2561 diff_flush_stat(p, options, &diffstat);
2562 }
2563 show_stats(&diffstat);
2564 separator++;
2565 }
2566
2567 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2568 for (i = 0; i < q->nr; i++)
2569 diff_summary(q->queue[i]);
2570 separator++;
2571 }
2572
2573 if (output_format & DIFF_FORMAT_PATCH) {
2574 if (separator) {
2575 if (options->stat_sep) {
2576 /* attach patch instead of inline */
2577 fputs(options->stat_sep, stdout);
2578 } else {
2579 putchar(options->line_termination);
2580 }
2581 }
2582
2583 for (i = 0; i < q->nr; i++) {
2584 struct diff_filepair *p = q->queue[i];
2585 if (check_pair_status(p))
2586 diff_flush_patch(p, options);
2587 }
2588 }
2589
2590 for (i = 0; i < q->nr; i++)
2591 diff_free_filepair(q->queue[i]);
2592 free_queue:
2593 free(q->queue);
2594 q->queue = NULL;
2595 q->nr = q->alloc = 0;
2596 }
2597
2598 static void diffcore_apply_filter(const char *filter)
2599 {
2600 int i;
2601 struct diff_queue_struct *q = &diff_queued_diff;
2602 struct diff_queue_struct outq;
2603 outq.queue = NULL;
2604 outq.nr = outq.alloc = 0;
2605
2606 if (!filter)
2607 return;
2608
2609 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2610 int found;
2611 for (i = found = 0; !found && i < q->nr; i++) {
2612 struct diff_filepair *p = q->queue[i];
2613 if (((p->status == DIFF_STATUS_MODIFIED) &&
2614 ((p->score &&
2615 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2616 (!p->score &&
2617 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2618 ((p->status != DIFF_STATUS_MODIFIED) &&
2619 strchr(filter, p->status)))
2620 found++;
2621 }
2622 if (found)
2623 return;
2624
2625 /* otherwise we will clear the whole queue
2626 * by copying the empty outq at the end of this
2627 * function, but first clear the current entries
2628 * in the queue.
2629 */
2630 for (i = 0; i < q->nr; i++)
2631 diff_free_filepair(q->queue[i]);
2632 }
2633 else {
2634 /* Only the matching ones */
2635 for (i = 0; i < q->nr; i++) {
2636 struct diff_filepair *p = q->queue[i];
2637
2638 if (((p->status == DIFF_STATUS_MODIFIED) &&
2639 ((p->score &&
2640 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2641 (!p->score &&
2642 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2643 ((p->status != DIFF_STATUS_MODIFIED) &&
2644 strchr(filter, p->status)))
2645 diff_q(&outq, p);
2646 else
2647 diff_free_filepair(p);
2648 }
2649 }
2650 free(q->queue);
2651 *q = outq;
2652 }
2653
2654 void diffcore_std(struct diff_options *options)
2655 {
2656 if (options->break_opt != -1)
2657 diffcore_break(options->break_opt);
2658 if (options->detect_rename)
2659 diffcore_rename(options);
2660 if (options->break_opt != -1)
2661 diffcore_merge_broken();
2662 if (options->pickaxe)
2663 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2664 if (options->orderfile)
2665 diffcore_order(options->orderfile);
2666 diff_resolve_rename_copy();
2667 diffcore_apply_filter(options->filter);
2668 }
2669
2670
2671 void diffcore_std_no_resolve(struct diff_options *options)
2672 {
2673 if (options->pickaxe)
2674 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2675 if (options->orderfile)
2676 diffcore_order(options->orderfile);
2677 diffcore_apply_filter(options->filter);
2678 }
2679
2680 void diff_addremove(struct diff_options *options,
2681 int addremove, unsigned mode,
2682 const unsigned char *sha1,
2683 const char *base, const char *path)
2684 {
2685 char concatpath[PATH_MAX];
2686 struct diff_filespec *one, *two;
2687
2688 /* This may look odd, but it is a preparation for
2689 * feeding "there are unchanged files which should
2690 * not produce diffs, but when you are doing copy
2691 * detection you would need them, so here they are"
2692 * entries to the diff-core. They will be prefixed
2693 * with something like '=' or '*' (I haven't decided
2694 * which but should not make any difference).
2695 * Feeding the same new and old to diff_change()
2696 * also has the same effect.
2697 * Before the final output happens, they are pruned after
2698 * merged into rename/copy pairs as appropriate.
2699 */
2700 if (options->reverse_diff)
2701 addremove = (addremove == '+' ? '-' :
2702 addremove == '-' ? '+' : addremove);
2703
2704 if (!path) path = "";
2705 sprintf(concatpath, "%s%s", base, path);
2706 one = alloc_filespec(concatpath);
2707 two = alloc_filespec(concatpath);
2708
2709 if (addremove != '+')
2710 fill_filespec(one, sha1, mode);
2711 if (addremove != '-')
2712 fill_filespec(two, sha1, mode);
2713
2714 diff_queue(&diff_queued_diff, one, two);
2715 }
2716
2717 void diff_change(struct diff_options *options,
2718 unsigned old_mode, unsigned new_mode,
2719 const unsigned char *old_sha1,
2720 const unsigned char *new_sha1,
2721 const char *base, const char *path)
2722 {
2723 char concatpath[PATH_MAX];
2724 struct diff_filespec *one, *two;
2725
2726 if (options->reverse_diff) {
2727 unsigned tmp;
2728 const unsigned char *tmp_c;
2729 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
2730 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
2731 }
2732 if (!path) path = "";
2733 sprintf(concatpath, "%s%s", base, path);
2734 one = alloc_filespec(concatpath);
2735 two = alloc_filespec(concatpath);
2736 fill_filespec(one, old_sha1, old_mode);
2737 fill_filespec(two, new_sha1, new_mode);
2738
2739 diff_queue(&diff_queued_diff, one, two);
2740 }
2741
2742 void diff_unmerge(struct diff_options *options,
2743 const char *path)
2744 {
2745 struct diff_filespec *one, *two;
2746 one = alloc_filespec(path);
2747 two = alloc_filespec(path);
2748 diff_queue(&diff_queued_diff, one, two);
2749 }
MinGW port of GIT