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Merge branches 'lh/submodules' and 'pb/am'
[alt-git.git] / diff.c
blob508bc51ed59998be463fd429ee074654baaad76a
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12
13 #ifdef NO_FAST_WORKING_DIRECTORY
14 #define FAST_WORKING_DIRECTORY 0
15 #else
16 #define FAST_WORKING_DIRECTORY 1
17 #endif
18
19 static int diff_detect_rename_default;
20 static int diff_rename_limit_default = -1;
21 static int diff_use_color_default;
22
23 static char diff_colors[][COLOR_MAXLEN] = {
24 "\033[m", /* reset */
25 "", /* PLAIN (normal) */
26 "\033[1m", /* METAINFO (bold) */
27 "\033[36m", /* FRAGINFO (cyan) */
28 "\033[31m", /* OLD (red) */
29 "\033[32m", /* NEW (green) */
30 "\033[33m", /* COMMIT (yellow) */
31 "\033[41m", /* WHITESPACE (red background) */
32 };
33
34 static int parse_diff_color_slot(const char *var, int ofs)
35 {
36 if (!strcasecmp(var+ofs, "plain"))
37 return DIFF_PLAIN;
38 if (!strcasecmp(var+ofs, "meta"))
39 return DIFF_METAINFO;
40 if (!strcasecmp(var+ofs, "frag"))
41 return DIFF_FRAGINFO;
42 if (!strcasecmp(var+ofs, "old"))
43 return DIFF_FILE_OLD;
44 if (!strcasecmp(var+ofs, "new"))
45 return DIFF_FILE_NEW;
46 if (!strcasecmp(var+ofs, "commit"))
47 return DIFF_COMMIT;
48 if (!strcasecmp(var+ofs, "whitespace"))
49 return DIFF_WHITESPACE;
50 die("bad config variable '%s'", var);
51 }
52
53 static struct ll_diff_driver {
54 const char *name;
55 struct ll_diff_driver *next;
56 char *cmd;
57 } *user_diff, **user_diff_tail;
58
59 /*
60 * Currently there is only "diff.<drivername>.command" variable;
61 * because there are "diff.color.<slot>" variables, we are parsing
62 * this in a bit convoluted way to allow low level diff driver
63 * called "color".
64 */
65 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
66 {
67 const char *name;
68 int namelen;
69 struct ll_diff_driver *drv;
70
71 name = var + 5;
72 namelen = ep - name;
73 for (drv = user_diff; drv; drv = drv->next)
74 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
75 break;
76 if (!drv) {
77 char *namebuf;
78 drv = xcalloc(1, sizeof(struct ll_diff_driver));
79 namebuf = xmalloc(namelen + 1);
80 memcpy(namebuf, name, namelen);
81 namebuf[namelen] = 0;
82 drv->name = namebuf;
83 drv->next = NULL;
84 if (!user_diff_tail)
85 user_diff_tail = &user_diff;
86 *user_diff_tail = drv;
87 user_diff_tail = &(drv->next);
88 }
89
90 if (!value)
91 return error("%s: lacks value", var);
92 drv->cmd = strdup(value);
93 return 0;
94 }
95
96 /*
97 * These are to give UI layer defaults.
98 * The core-level commands such as git-diff-files should
99 * never be affected by the setting of diff.renames
100 * the user happens to have in the configuration file.
101 */
102 int git_diff_ui_config(const char *var, const char *value)
103 {
104 if (!strcmp(var, "diff.renamelimit")) {
105 diff_rename_limit_default = git_config_int(var, value);
106 return 0;
107 }
108 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
109 diff_use_color_default = git_config_colorbool(var, value);
110 return 0;
111 }
112 if (!strcmp(var, "diff.renames")) {
113 if (!value)
114 diff_detect_rename_default = DIFF_DETECT_RENAME;
115 else if (!strcasecmp(value, "copies") ||
116 !strcasecmp(value, "copy"))
117 diff_detect_rename_default = DIFF_DETECT_COPY;
118 else if (git_config_bool(var,value))
119 diff_detect_rename_default = DIFF_DETECT_RENAME;
120 return 0;
121 }
122 if (!prefixcmp(var, "diff.")) {
123 const char *ep = strrchr(var, '.');
124
125 if (ep != var + 4 && !strcmp(ep, ".command"))
126 return parse_lldiff_command(var, ep, value);
127 }
128 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
129 int slot = parse_diff_color_slot(var, 11);
130 color_parse(value, var, diff_colors[slot]);
131 return 0;
132 }
133
134 return git_default_config(var, value);
135 }
136
137 static char *quote_one(const char *str)
138 {
139 int needlen;
140 char *xp;
141
142 if (!str)
143 return NULL;
144 needlen = quote_c_style(str, NULL, NULL, 0);
145 if (!needlen)
146 return xstrdup(str);
147 xp = xmalloc(needlen + 1);
148 quote_c_style(str, xp, NULL, 0);
149 return xp;
150 }
151
152 static char *quote_two(const char *one, const char *two)
153 {
154 int need_one = quote_c_style(one, NULL, NULL, 1);
155 int need_two = quote_c_style(two, NULL, NULL, 1);
156 char *xp;
157
158 if (need_one + need_two) {
159 if (!need_one) need_one = strlen(one);
160 if (!need_two) need_one = strlen(two);
161
162 xp = xmalloc(need_one + need_two + 3);
163 xp[0] = '"';
164 quote_c_style(one, xp + 1, NULL, 1);
165 quote_c_style(two, xp + need_one + 1, NULL, 1);
166 strcpy(xp + need_one + need_two + 1, "\"");
167 return xp;
168 }
169 need_one = strlen(one);
170 need_two = strlen(two);
171 xp = xmalloc(need_one + need_two + 1);
172 strcpy(xp, one);
173 strcpy(xp + need_one, two);
174 return xp;
175 }
176
177 static const char *external_diff(void)
178 {
179 static const char *external_diff_cmd = NULL;
180 static int done_preparing = 0;
181
182 if (done_preparing)
183 return external_diff_cmd;
184 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
185 done_preparing = 1;
186 return external_diff_cmd;
187 }
188
189 static struct diff_tempfile {
190 const char *name; /* filename external diff should read from */
191 char hex[41];
192 char mode[10];
193 char tmp_path[PATH_MAX];
194 } diff_temp[2];
195
196 static int count_lines(const char *data, int size)
197 {
198 int count, ch, completely_empty = 1, nl_just_seen = 0;
199 count = 0;
200 while (0 < size--) {
201 ch = *data++;
202 if (ch == '\n') {
203 count++;
204 nl_just_seen = 1;
205 completely_empty = 0;
206 }
207 else {
208 nl_just_seen = 0;
209 completely_empty = 0;
210 }
211 }
212 if (completely_empty)
213 return 0;
214 if (!nl_just_seen)
215 count++; /* no trailing newline */
216 return count;
217 }
218
219 static void print_line_count(int count)
220 {
221 switch (count) {
222 case 0:
223 printf("0,0");
224 break;
225 case 1:
226 printf("1");
227 break;
228 default:
229 printf("1,%d", count);
230 break;
231 }
232 }
233
234 static void copy_file(int prefix, const char *data, int size,
235 const char *set, const char *reset)
236 {
237 int ch, nl_just_seen = 1;
238 while (0 < size--) {
239 ch = *data++;
240 if (nl_just_seen) {
241 fputs(set, stdout);
242 putchar(prefix);
243 }
244 if (ch == '\n') {
245 nl_just_seen = 1;
246 fputs(reset, stdout);
247 } else
248 nl_just_seen = 0;
249 putchar(ch);
250 }
251 if (!nl_just_seen)
252 printf("%s\n\\ No newline at end of file\n", reset);
253 }
254
255 static void emit_rewrite_diff(const char *name_a,
256 const char *name_b,
257 struct diff_filespec *one,
258 struct diff_filespec *two,
259 int color_diff)
260 {
261 int lc_a, lc_b;
262 const char *name_a_tab, *name_b_tab;
263 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
264 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
265 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
266 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
267 const char *reset = diff_get_color(color_diff, DIFF_RESET);
268
269 name_a += (*name_a == '/');
270 name_b += (*name_b == '/');
271 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
272 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
273
274 diff_populate_filespec(one, 0);
275 diff_populate_filespec(two, 0);
276 lc_a = count_lines(one->data, one->size);
277 lc_b = count_lines(two->data, two->size);
278 printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
279 metainfo, name_a, name_a_tab, reset,
280 metainfo, name_b, name_b_tab, reset, fraginfo);
281 print_line_count(lc_a);
282 printf(" +");
283 print_line_count(lc_b);
284 printf(" @@%s\n", reset);
285 if (lc_a)
286 copy_file('-', one->data, one->size, old, reset);
287 if (lc_b)
288 copy_file('+', two->data, two->size, new, reset);
289 }
290
291 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
292 {
293 if (!DIFF_FILE_VALID(one)) {
294 mf->ptr = (char *)""; /* does not matter */
295 mf->size = 0;
296 return 0;
297 }
298 else if (diff_populate_filespec(one, 0))
299 return -1;
300 mf->ptr = one->data;
301 mf->size = one->size;
302 return 0;
303 }
304
305 struct diff_words_buffer {
306 mmfile_t text;
307 long alloc;
308 long current; /* output pointer */
309 int suppressed_newline;
310 };
311
312 static void diff_words_append(char *line, unsigned long len,
313 struct diff_words_buffer *buffer)
314 {
315 if (buffer->text.size + len > buffer->alloc) {
316 buffer->alloc = (buffer->text.size + len) * 3 / 2;
317 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
318 }
319 line++;
320 len--;
321 memcpy(buffer->text.ptr + buffer->text.size, line, len);
322 buffer->text.size += len;
323 }
324
325 struct diff_words_data {
326 struct xdiff_emit_state xm;
327 struct diff_words_buffer minus, plus;
328 };
329
330 static void print_word(struct diff_words_buffer *buffer, int len, int color,
331 int suppress_newline)
332 {
333 const char *ptr;
334 int eol = 0;
335
336 if (len == 0)
337 return;
338
339 ptr = buffer->text.ptr + buffer->current;
340 buffer->current += len;
341
342 if (ptr[len - 1] == '\n') {
343 eol = 1;
344 len--;
345 }
346
347 fputs(diff_get_color(1, color), stdout);
348 fwrite(ptr, len, 1, stdout);
349 fputs(diff_get_color(1, DIFF_RESET), stdout);
350
351 if (eol) {
352 if (suppress_newline)
353 buffer->suppressed_newline = 1;
354 else
355 putchar('\n');
356 }
357 }
358
359 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
360 {
361 struct diff_words_data *diff_words = priv;
362
363 if (diff_words->minus.suppressed_newline) {
364 if (line[0] != '+')
365 putchar('\n');
366 diff_words->minus.suppressed_newline = 0;
367 }
368
369 len--;
370 switch (line[0]) {
371 case '-':
372 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
373 break;
374 case '+':
375 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
376 break;
377 case ' ':
378 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
379 diff_words->minus.current += len;
380 break;
381 }
382 }
383
384 /* this executes the word diff on the accumulated buffers */
385 static void diff_words_show(struct diff_words_data *diff_words)
386 {
387 xpparam_t xpp;
388 xdemitconf_t xecfg;
389 xdemitcb_t ecb;
390 mmfile_t minus, plus;
391 int i;
392
393 minus.size = diff_words->minus.text.size;
394 minus.ptr = xmalloc(minus.size);
395 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
396 for (i = 0; i < minus.size; i++)
397 if (isspace(minus.ptr[i]))
398 minus.ptr[i] = '\n';
399 diff_words->minus.current = 0;
400
401 plus.size = diff_words->plus.text.size;
402 plus.ptr = xmalloc(plus.size);
403 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
404 for (i = 0; i < plus.size; i++)
405 if (isspace(plus.ptr[i]))
406 plus.ptr[i] = '\n';
407 diff_words->plus.current = 0;
408
409 xpp.flags = XDF_NEED_MINIMAL;
410 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
411 xecfg.flags = 0;
412 ecb.outf = xdiff_outf;
413 ecb.priv = diff_words;
414 diff_words->xm.consume = fn_out_diff_words_aux;
415 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
416
417 free(minus.ptr);
418 free(plus.ptr);
419 diff_words->minus.text.size = diff_words->plus.text.size = 0;
420
421 if (diff_words->minus.suppressed_newline) {
422 putchar('\n');
423 diff_words->minus.suppressed_newline = 0;
424 }
425 }
426
427 struct emit_callback {
428 struct xdiff_emit_state xm;
429 int nparents, color_diff;
430 const char **label_path;
431 struct diff_words_data *diff_words;
432 int *found_changesp;
433 };
434
435 static void free_diff_words_data(struct emit_callback *ecbdata)
436 {
437 if (ecbdata->diff_words) {
438 /* flush buffers */
439 if (ecbdata->diff_words->minus.text.size ||
440 ecbdata->diff_words->plus.text.size)
441 diff_words_show(ecbdata->diff_words);
442
443 if (ecbdata->diff_words->minus.text.ptr)
444 free (ecbdata->diff_words->minus.text.ptr);
445 if (ecbdata->diff_words->plus.text.ptr)
446 free (ecbdata->diff_words->plus.text.ptr);
447 free(ecbdata->diff_words);
448 ecbdata->diff_words = NULL;
449 }
450 }
451
452 const char *diff_get_color(int diff_use_color, enum color_diff ix)
453 {
454 if (diff_use_color)
455 return diff_colors[ix];
456 return "";
457 }
458
459 static void emit_line(const char *set, const char *reset, const char *line, int len)
460 {
461 if (len > 0 && line[len-1] == '\n')
462 len--;
463 fputs(set, stdout);
464 fwrite(line, len, 1, stdout);
465 puts(reset);
466 }
467
468 static void emit_line_with_ws(int nparents,
469 const char *set, const char *reset, const char *ws,
470 const char *line, int len)
471 {
472 int col0 = nparents;
473 int last_tab_in_indent = -1;
474 int last_space_in_indent = -1;
475 int i;
476 int tail = len;
477 int need_highlight_leading_space = 0;
478 /* The line is a newly added line. Does it have funny leading
479 * whitespaces? In indent, SP should never precede a TAB.
480 */
481 for (i = col0; i < len; i++) {
482 if (line[i] == '\t') {
483 last_tab_in_indent = i;
484 if (0 <= last_space_in_indent)
485 need_highlight_leading_space = 1;
486 }
487 else if (line[i] == ' ')
488 last_space_in_indent = i;
489 else
490 break;
491 }
492 fputs(set, stdout);
493 fwrite(line, col0, 1, stdout);
494 fputs(reset, stdout);
495 if (((i == len) || line[i] == '\n') && i != col0) {
496 /* The whole line was indent */
497 emit_line(ws, reset, line + col0, len - col0);
498 return;
499 }
500 i = col0;
501 if (need_highlight_leading_space) {
502 while (i < last_tab_in_indent) {
503 if (line[i] == ' ') {
504 fputs(ws, stdout);
505 putchar(' ');
506 fputs(reset, stdout);
507 }
508 else
509 putchar(line[i]);
510 i++;
511 }
512 }
513 tail = len - 1;
514 if (line[tail] == '\n' && i < tail)
515 tail--;
516 while (i < tail) {
517 if (!isspace(line[tail]))
518 break;
519 tail--;
520 }
521 if ((i < tail && line[tail + 1] != '\n')) {
522 /* This has whitespace between tail+1..len */
523 fputs(set, stdout);
524 fwrite(line + i, tail - i + 1, 1, stdout);
525 fputs(reset, stdout);
526 emit_line(ws, reset, line + tail + 1, len - tail - 1);
527 }
528 else
529 emit_line(set, reset, line + i, len - i);
530 }
531
532 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
533 {
534 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
535 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
536
537 if (!*ws)
538 emit_line(set, reset, line, len);
539 else
540 emit_line_with_ws(ecbdata->nparents, set, reset, ws,
541 line, len);
542 }
543
544 static void fn_out_consume(void *priv, char *line, unsigned long len)
545 {
546 int i;
547 int color;
548 struct emit_callback *ecbdata = priv;
549 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
550 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
551
552 *(ecbdata->found_changesp) = 1;
553
554 if (ecbdata->label_path[0]) {
555 const char *name_a_tab, *name_b_tab;
556
557 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
558 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
559
560 printf("%s--- %s%s%s\n",
561 set, ecbdata->label_path[0], reset, name_a_tab);
562 printf("%s+++ %s%s%s\n",
563 set, ecbdata->label_path[1], reset, name_b_tab);
564 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
565 }
566
567 /* This is not really necessary for now because
568 * this codepath only deals with two-way diffs.
569 */
570 for (i = 0; i < len && line[i] == '@'; i++)
571 ;
572 if (2 <= i && i < len && line[i] == ' ') {
573 ecbdata->nparents = i - 1;
574 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
575 reset, line, len);
576 return;
577 }
578
579 if (len < ecbdata->nparents) {
580 set = reset;
581 emit_line(reset, reset, line, len);
582 return;
583 }
584
585 color = DIFF_PLAIN;
586 if (ecbdata->diff_words && ecbdata->nparents != 1)
587 /* fall back to normal diff */
588 free_diff_words_data(ecbdata);
589 if (ecbdata->diff_words) {
590 if (line[0] == '-') {
591 diff_words_append(line, len,
592 &ecbdata->diff_words->minus);
593 return;
594 } else if (line[0] == '+') {
595 diff_words_append(line, len,
596 &ecbdata->diff_words->plus);
597 return;
598 }
599 if (ecbdata->diff_words->minus.text.size ||
600 ecbdata->diff_words->plus.text.size)
601 diff_words_show(ecbdata->diff_words);
602 line++;
603 len--;
604 emit_line(set, reset, line, len);
605 return;
606 }
607 for (i = 0; i < ecbdata->nparents && len; i++) {
608 if (line[i] == '-')
609 color = DIFF_FILE_OLD;
610 else if (line[i] == '+')
611 color = DIFF_FILE_NEW;
612 }
613
614 if (color != DIFF_FILE_NEW) {
615 emit_line(diff_get_color(ecbdata->color_diff, color),
616 reset, line, len);
617 return;
618 }
619 emit_add_line(reset, ecbdata, line, len);
620 }
621
622 static char *pprint_rename(const char *a, const char *b)
623 {
624 const char *old = a;
625 const char *new = b;
626 char *name = NULL;
627 int pfx_length, sfx_length;
628 int len_a = strlen(a);
629 int len_b = strlen(b);
630 int qlen_a = quote_c_style(a, NULL, NULL, 0);
631 int qlen_b = quote_c_style(b, NULL, NULL, 0);
632
633 if (qlen_a || qlen_b) {
634 if (qlen_a) len_a = qlen_a;
635 if (qlen_b) len_b = qlen_b;
636 name = xmalloc( len_a + len_b + 5 );
637 if (qlen_a)
638 quote_c_style(a, name, NULL, 0);
639 else
640 memcpy(name, a, len_a);
641 memcpy(name + len_a, " => ", 4);
642 if (qlen_b)
643 quote_c_style(b, name + len_a + 4, NULL, 0);
644 else
645 memcpy(name + len_a + 4, b, len_b + 1);
646 return name;
647 }
648
649 /* Find common prefix */
650 pfx_length = 0;
651 while (*old && *new && *old == *new) {
652 if (*old == '/')
653 pfx_length = old - a + 1;
654 old++;
655 new++;
656 }
657
658 /* Find common suffix */
659 old = a + len_a;
660 new = b + len_b;
661 sfx_length = 0;
662 while (a <= old && b <= new && *old == *new) {
663 if (*old == '/')
664 sfx_length = len_a - (old - a);
665 old--;
666 new--;
667 }
668
669 /*
670 * pfx{mid-a => mid-b}sfx
671 * {pfx-a => pfx-b}sfx
672 * pfx{sfx-a => sfx-b}
673 * name-a => name-b
674 */
675 if (pfx_length + sfx_length) {
676 int a_midlen = len_a - pfx_length - sfx_length;
677 int b_midlen = len_b - pfx_length - sfx_length;
678 if (a_midlen < 0) a_midlen = 0;
679 if (b_midlen < 0) b_midlen = 0;
680
681 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
682 sprintf(name, "%.*s{%.*s => %.*s}%s",
683 pfx_length, a,
684 a_midlen, a + pfx_length,
685 b_midlen, b + pfx_length,
686 a + len_a - sfx_length);
687 }
688 else {
689 name = xmalloc(len_a + len_b + 5);
690 sprintf(name, "%s => %s", a, b);
691 }
692 return name;
693 }
694
695 struct diffstat_t {
696 struct xdiff_emit_state xm;
697
698 int nr;
699 int alloc;
700 struct diffstat_file {
701 char *name;
702 unsigned is_unmerged:1;
703 unsigned is_binary:1;
704 unsigned is_renamed:1;
705 unsigned int added, deleted;
706 } **files;
707 };
708
709 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
710 const char *name_a,
711 const char *name_b)
712 {
713 struct diffstat_file *x;
714 x = xcalloc(sizeof (*x), 1);
715 if (diffstat->nr == diffstat->alloc) {
716 diffstat->alloc = alloc_nr(diffstat->alloc);
717 diffstat->files = xrealloc(diffstat->files,
718 diffstat->alloc * sizeof(x));
719 }
720 diffstat->files[diffstat->nr++] = x;
721 if (name_b) {
722 x->name = pprint_rename(name_a, name_b);
723 x->is_renamed = 1;
724 }
725 else
726 x->name = xstrdup(name_a);
727 return x;
728 }
729
730 static void diffstat_consume(void *priv, char *line, unsigned long len)
731 {
732 struct diffstat_t *diffstat = priv;
733 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
734
735 if (line[0] == '+')
736 x->added++;
737 else if (line[0] == '-')
738 x->deleted++;
739 }
740
741 const char mime_boundary_leader[] = "------------";
742
743 static int scale_linear(int it, int width, int max_change)
744 {
745 /*
746 * make sure that at least one '-' is printed if there were deletions,
747 * and likewise for '+'.
748 */
749 if (max_change < 2)
750 return it;
751 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
752 }
753
754 static void show_name(const char *prefix, const char *name, int len,
755 const char *reset, const char *set)
756 {
757 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
758 }
759
760 static void show_graph(char ch, int cnt, const char *set, const char *reset)
761 {
762 if (cnt <= 0)
763 return;
764 printf("%s", set);
765 while (cnt--)
766 putchar(ch);
767 printf("%s", reset);
768 }
769
770 static void show_stats(struct diffstat_t* data, struct diff_options *options)
771 {
772 int i, len, add, del, total, adds = 0, dels = 0;
773 int max_change = 0, max_len = 0;
774 int total_files = data->nr;
775 int width, name_width;
776 const char *reset, *set, *add_c, *del_c;
777
778 if (data->nr == 0)
779 return;
780
781 width = options->stat_width ? options->stat_width : 80;
782 name_width = options->stat_name_width ? options->stat_name_width : 50;
783
784 /* Sanity: give at least 5 columns to the graph,
785 * but leave at least 10 columns for the name.
786 */
787 if (width < name_width + 15) {
788 if (name_width <= 25)
789 width = name_width + 15;
790 else
791 name_width = width - 15;
792 }
793
794 /* Find the longest filename and max number of changes */
795 reset = diff_get_color(options->color_diff, DIFF_RESET);
796 set = diff_get_color(options->color_diff, DIFF_PLAIN);
797 add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
798 del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
799
800 for (i = 0; i < data->nr; i++) {
801 struct diffstat_file *file = data->files[i];
802 int change = file->added + file->deleted;
803
804 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
805 len = quote_c_style(file->name, NULL, NULL, 0);
806 if (len) {
807 char *qname = xmalloc(len + 1);
808 quote_c_style(file->name, qname, NULL, 0);
809 free(file->name);
810 file->name = qname;
811 }
812 }
813
814 len = strlen(file->name);
815 if (max_len < len)
816 max_len = len;
817
818 if (file->is_binary || file->is_unmerged)
819 continue;
820 if (max_change < change)
821 max_change = change;
822 }
823
824 /* Compute the width of the graph part;
825 * 10 is for one blank at the beginning of the line plus
826 * " | count " between the name and the graph.
827 *
828 * From here on, name_width is the width of the name area,
829 * and width is the width of the graph area.
830 */
831 name_width = (name_width < max_len) ? name_width : max_len;
832 if (width < (name_width + 10) + max_change)
833 width = width - (name_width + 10);
834 else
835 width = max_change;
836
837 for (i = 0; i < data->nr; i++) {
838 const char *prefix = "";
839 char *name = data->files[i]->name;
840 int added = data->files[i]->added;
841 int deleted = data->files[i]->deleted;
842 int name_len;
843
844 /*
845 * "scale" the filename
846 */
847 len = name_width;
848 name_len = strlen(name);
849 if (name_width < name_len) {
850 char *slash;
851 prefix = "...";
852 len -= 3;
853 name += name_len - len;
854 slash = strchr(name, '/');
855 if (slash)
856 name = slash;
857 }
858
859 if (data->files[i]->is_binary) {
860 show_name(prefix, name, len, reset, set);
861 printf(" Bin ");
862 printf("%s%d%s", del_c, deleted, reset);
863 printf(" -> ");
864 printf("%s%d%s", add_c, added, reset);
865 printf(" bytes");
866 printf("\n");
867 goto free_diffstat_file;
868 }
869 else if (data->files[i]->is_unmerged) {
870 show_name(prefix, name, len, reset, set);
871 printf(" Unmerged\n");
872 goto free_diffstat_file;
873 }
874 else if (!data->files[i]->is_renamed &&
875 (added + deleted == 0)) {
876 total_files--;
877 goto free_diffstat_file;
878 }
879
880 /*
881 * scale the add/delete
882 */
883 add = added;
884 del = deleted;
885 total = add + del;
886 adds += add;
887 dels += del;
888
889 if (width <= max_change) {
890 add = scale_linear(add, width, max_change);
891 del = scale_linear(del, width, max_change);
892 total = add + del;
893 }
894 show_name(prefix, name, len, reset, set);
895 printf("%5d ", added + deleted);
896 show_graph('+', add, add_c, reset);
897 show_graph('-', del, del_c, reset);
898 putchar('\n');
899 free_diffstat_file:
900 free(data->files[i]->name);
901 free(data->files[i]);
902 }
903 free(data->files);
904 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
905 set, total_files, adds, dels, reset);
906 }
907
908 static void show_shortstats(struct diffstat_t* data)
909 {
910 int i, adds = 0, dels = 0, total_files = data->nr;
911
912 if (data->nr == 0)
913 return;
914
915 for (i = 0; i < data->nr; i++) {
916 if (!data->files[i]->is_binary &&
917 !data->files[i]->is_unmerged) {
918 int added = data->files[i]->added;
919 int deleted= data->files[i]->deleted;
920 if (!data->files[i]->is_renamed &&
921 (added + deleted == 0)) {
922 total_files--;
923 } else {
924 adds += added;
925 dels += deleted;
926 }
927 }
928 free(data->files[i]->name);
929 free(data->files[i]);
930 }
931 free(data->files);
932
933 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
934 total_files, adds, dels);
935 }
936
937 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
938 {
939 int i;
940
941 for (i = 0; i < data->nr; i++) {
942 struct diffstat_file *file = data->files[i];
943
944 if (file->is_binary)
945 printf("-\t-\t");
946 else
947 printf("%d\t%d\t", file->added, file->deleted);
948 if (options->line_termination && !file->is_renamed &&
949 quote_c_style(file->name, NULL, NULL, 0))
950 quote_c_style(file->name, NULL, stdout, 0);
951 else
952 fputs(file->name, stdout);
953 putchar(options->line_termination);
954 }
955 }
956
957 struct checkdiff_t {
958 struct xdiff_emit_state xm;
959 const char *filename;
960 int lineno, color_diff;
961 };
962
963 static void checkdiff_consume(void *priv, char *line, unsigned long len)
964 {
965 struct checkdiff_t *data = priv;
966 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
967 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
968 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
969
970 if (line[0] == '+') {
971 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
972
973 /* check space before tab */
974 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
975 if (line[i] == ' ')
976 spaces++;
977 if (line[i - 1] == '\t' && spaces)
978 space_before_tab = 1;
979
980 /* check white space at line end */
981 if (line[len - 1] == '\n')
982 len--;
983 if (isspace(line[len - 1]))
984 white_space_at_end = 1;
985
986 if (space_before_tab || white_space_at_end) {
987 printf("%s:%d: %s", data->filename, data->lineno, ws);
988 if (space_before_tab) {
989 printf("space before tab");
990 if (white_space_at_end)
991 putchar(',');
992 }
993 if (white_space_at_end)
994 printf("white space at end");
995 printf(":%s ", reset);
996 emit_line_with_ws(1, set, reset, ws, line, len);
997 }
998
999 data->lineno++;
1000 } else if (line[0] == ' ')
1001 data->lineno++;
1002 else if (line[0] == '@') {
1003 char *plus = strchr(line, '+');
1004 if (plus)
1005 data->lineno = strtol(plus, NULL, 10);
1006 else
1007 die("invalid diff");
1008 }
1009 }
1010
1011 static unsigned char *deflate_it(char *data,
1012 unsigned long size,
1013 unsigned long *result_size)
1014 {
1015 int bound;
1016 unsigned char *deflated;
1017 z_stream stream;
1018
1019 memset(&stream, 0, sizeof(stream));
1020 deflateInit(&stream, zlib_compression_level);
1021 bound = deflateBound(&stream, size);
1022 deflated = xmalloc(bound);
1023 stream.next_out = deflated;
1024 stream.avail_out = bound;
1025
1026 stream.next_in = (unsigned char *)data;
1027 stream.avail_in = size;
1028 while (deflate(&stream, Z_FINISH) == Z_OK)
1029 ; /* nothing */
1030 deflateEnd(&stream);
1031 *result_size = stream.total_out;
1032 return deflated;
1033 }
1034
1035 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1036 {
1037 void *cp;
1038 void *delta;
1039 void *deflated;
1040 void *data;
1041 unsigned long orig_size;
1042 unsigned long delta_size;
1043 unsigned long deflate_size;
1044 unsigned long data_size;
1045
1046 /* We could do deflated delta, or we could do just deflated two,
1047 * whichever is smaller.
1048 */
1049 delta = NULL;
1050 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1051 if (one->size && two->size) {
1052 delta = diff_delta(one->ptr, one->size,
1053 two->ptr, two->size,
1054 &delta_size, deflate_size);
1055 if (delta) {
1056 void *to_free = delta;
1057 orig_size = delta_size;
1058 delta = deflate_it(delta, delta_size, &delta_size);
1059 free(to_free);
1060 }
1061 }
1062
1063 if (delta && delta_size < deflate_size) {
1064 printf("delta %lu\n", orig_size);
1065 free(deflated);
1066 data = delta;
1067 data_size = delta_size;
1068 }
1069 else {
1070 printf("literal %lu\n", two->size);
1071 free(delta);
1072 data = deflated;
1073 data_size = deflate_size;
1074 }
1075
1076 /* emit data encoded in base85 */
1077 cp = data;
1078 while (data_size) {
1079 int bytes = (52 < data_size) ? 52 : data_size;
1080 char line[70];
1081 data_size -= bytes;
1082 if (bytes <= 26)
1083 line[0] = bytes + 'A' - 1;
1084 else
1085 line[0] = bytes - 26 + 'a' - 1;
1086 encode_85(line + 1, cp, bytes);
1087 cp = (char *) cp + bytes;
1088 puts(line);
1089 }
1090 printf("\n");
1091 free(data);
1092 }
1093
1094 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1095 {
1096 printf("GIT binary patch\n");
1097 emit_binary_diff_body(one, two);
1098 emit_binary_diff_body(two, one);
1099 }
1100
1101 static void setup_diff_attr_check(struct git_attr_check *check)
1102 {
1103 static struct git_attr *attr_diff;
1104
1105 if (!attr_diff)
1106 attr_diff = git_attr("diff", 4);
1107 check->attr = attr_diff;
1108 }
1109
1110 #define FIRST_FEW_BYTES 8000
1111 static int file_is_binary(struct diff_filespec *one)
1112 {
1113 unsigned long sz;
1114 struct git_attr_check attr_diff_check;
1115
1116 setup_diff_attr_check(&attr_diff_check);
1117 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1118 const char *value = attr_diff_check.value;
1119 if (ATTR_TRUE(value))
1120 return 0;
1121 else if (ATTR_FALSE(value))
1122 return 1;
1123 }
1124
1125 if (!one->data) {
1126 if (!DIFF_FILE_VALID(one))
1127 return 0;
1128 diff_populate_filespec(one, 0);
1129 }
1130 sz = one->size;
1131 if (FIRST_FEW_BYTES < sz)
1132 sz = FIRST_FEW_BYTES;
1133 return !!memchr(one->data, 0, sz);
1134 }
1135
1136 static void builtin_diff(const char *name_a,
1137 const char *name_b,
1138 struct diff_filespec *one,
1139 struct diff_filespec *two,
1140 const char *xfrm_msg,
1141 struct diff_options *o,
1142 int complete_rewrite)
1143 {
1144 mmfile_t mf1, mf2;
1145 const char *lbl[2];
1146 char *a_one, *b_two;
1147 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1148 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
1149
1150 a_one = quote_two("a/", name_a + (*name_a == '/'));
1151 b_two = quote_two("b/", name_b + (*name_b == '/'));
1152 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1153 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1154 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1155 if (lbl[0][0] == '/') {
1156 /* /dev/null */
1157 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1158 if (xfrm_msg && xfrm_msg[0])
1159 printf("%s%s%s\n", set, xfrm_msg, reset);
1160 }
1161 else if (lbl[1][0] == '/') {
1162 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1163 if (xfrm_msg && xfrm_msg[0])
1164 printf("%s%s%s\n", set, xfrm_msg, reset);
1165 }
1166 else {
1167 if (one->mode != two->mode) {
1168 printf("%sold mode %06o%s\n", set, one->mode, reset);
1169 printf("%snew mode %06o%s\n", set, two->mode, reset);
1170 }
1171 if (xfrm_msg && xfrm_msg[0])
1172 printf("%s%s%s\n", set, xfrm_msg, reset);
1173 /*
1174 * we do not run diff between different kind
1175 * of objects.
1176 */
1177 if ((one->mode ^ two->mode) & S_IFMT)
1178 goto free_ab_and_return;
1179 if (complete_rewrite) {
1180 emit_rewrite_diff(name_a, name_b, one, two,
1181 o->color_diff);
1182 o->found_changes = 1;
1183 goto free_ab_and_return;
1184 }
1185 }
1186
1187 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1188 die("unable to read files to diff");
1189
1190 if (!o->text && (file_is_binary(one) || file_is_binary(two))) {
1191 /* Quite common confusing case */
1192 if (mf1.size == mf2.size &&
1193 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1194 goto free_ab_and_return;
1195 if (o->binary)
1196 emit_binary_diff(&mf1, &mf2);
1197 else
1198 printf("Binary files %s and %s differ\n",
1199 lbl[0], lbl[1]);
1200 o->found_changes = 1;
1201 }
1202 else {
1203 /* Crazy xdl interfaces.. */
1204 const char *diffopts = getenv("GIT_DIFF_OPTS");
1205 xpparam_t xpp;
1206 xdemitconf_t xecfg;
1207 xdemitcb_t ecb;
1208 struct emit_callback ecbdata;
1209
1210 memset(&ecbdata, 0, sizeof(ecbdata));
1211 ecbdata.label_path = lbl;
1212 ecbdata.color_diff = o->color_diff;
1213 ecbdata.found_changesp = &o->found_changes;
1214 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1215 xecfg.ctxlen = o->context;
1216 xecfg.flags = XDL_EMIT_FUNCNAMES;
1217 if (!diffopts)
1218 ;
1219 else if (!prefixcmp(diffopts, "--unified="))
1220 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1221 else if (!prefixcmp(diffopts, "-u"))
1222 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1223 ecb.outf = xdiff_outf;
1224 ecb.priv = &ecbdata;
1225 ecbdata.xm.consume = fn_out_consume;
1226 if (o->color_diff_words)
1227 ecbdata.diff_words =
1228 xcalloc(1, sizeof(struct diff_words_data));
1229 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1230 if (o->color_diff_words)
1231 free_diff_words_data(&ecbdata);
1232 }
1233
1234 free_ab_and_return:
1235 diff_free_filespec_data(one);
1236 diff_free_filespec_data(two);
1237 free(a_one);
1238 free(b_two);
1239 return;
1240 }
1241
1242 static void builtin_diffstat(const char *name_a, const char *name_b,
1243 struct diff_filespec *one,
1244 struct diff_filespec *two,
1245 struct diffstat_t *diffstat,
1246 struct diff_options *o,
1247 int complete_rewrite)
1248 {
1249 mmfile_t mf1, mf2;
1250 struct diffstat_file *data;
1251
1252 data = diffstat_add(diffstat, name_a, name_b);
1253
1254 if (!one || !two) {
1255 data->is_unmerged = 1;
1256 return;
1257 }
1258 if (complete_rewrite) {
1259 diff_populate_filespec(one, 0);
1260 diff_populate_filespec(two, 0);
1261 data->deleted = count_lines(one->data, one->size);
1262 data->added = count_lines(two->data, two->size);
1263 goto free_and_return;
1264 }
1265 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1266 die("unable to read files to diff");
1267
1268 if (file_is_binary(one) || file_is_binary(two)) {
1269 data->is_binary = 1;
1270 data->added = mf2.size;
1271 data->deleted = mf1.size;
1272 } else {
1273 /* Crazy xdl interfaces.. */
1274 xpparam_t xpp;
1275 xdemitconf_t xecfg;
1276 xdemitcb_t ecb;
1277
1278 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1279 xecfg.ctxlen = 0;
1280 xecfg.flags = 0;
1281 ecb.outf = xdiff_outf;
1282 ecb.priv = diffstat;
1283 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1284 }
1285
1286 free_and_return:
1287 diff_free_filespec_data(one);
1288 diff_free_filespec_data(two);
1289 }
1290
1291 static void builtin_checkdiff(const char *name_a, const char *name_b,
1292 struct diff_filespec *one,
1293 struct diff_filespec *two, struct diff_options *o)
1294 {
1295 mmfile_t mf1, mf2;
1296 struct checkdiff_t data;
1297
1298 if (!two)
1299 return;
1300
1301 memset(&data, 0, sizeof(data));
1302 data.xm.consume = checkdiff_consume;
1303 data.filename = name_b ? name_b : name_a;
1304 data.lineno = 0;
1305 data.color_diff = o->color_diff;
1306
1307 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1308 die("unable to read files to diff");
1309
1310 if (file_is_binary(two))
1311 goto free_and_return;
1312 else {
1313 /* Crazy xdl interfaces.. */
1314 xpparam_t xpp;
1315 xdemitconf_t xecfg;
1316 xdemitcb_t ecb;
1317
1318 xpp.flags = XDF_NEED_MINIMAL;
1319 xecfg.ctxlen = 0;
1320 xecfg.flags = 0;
1321 ecb.outf = xdiff_outf;
1322 ecb.priv = &data;
1323 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1324 }
1325 free_and_return:
1326 diff_free_filespec_data(one);
1327 diff_free_filespec_data(two);
1328 }
1329
1330 struct diff_filespec *alloc_filespec(const char *path)
1331 {
1332 int namelen = strlen(path);
1333 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1334
1335 memset(spec, 0, sizeof(*spec));
1336 spec->path = (char *)(spec + 1);
1337 memcpy(spec->path, path, namelen+1);
1338 return spec;
1339 }
1340
1341 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1342 unsigned short mode)
1343 {
1344 if (mode) {
1345 spec->mode = canon_mode(mode);
1346 hashcpy(spec->sha1, sha1);
1347 spec->sha1_valid = !is_null_sha1(sha1);
1348 }
1349 }
1350
1351 /*
1352 * Given a name and sha1 pair, if the index tells us the file in
1353 * the work tree has that object contents, return true, so that
1354 * prepare_temp_file() does not have to inflate and extract.
1355 */
1356 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1357 {
1358 struct cache_entry *ce;
1359 struct stat st;
1360 int pos, len;
1361
1362 /* We do not read the cache ourselves here, because the
1363 * benchmark with my previous version that always reads cache
1364 * shows that it makes things worse for diff-tree comparing
1365 * two linux-2.6 kernel trees in an already checked out work
1366 * tree. This is because most diff-tree comparisons deal with
1367 * only a small number of files, while reading the cache is
1368 * expensive for a large project, and its cost outweighs the
1369 * savings we get by not inflating the object to a temporary
1370 * file. Practically, this code only helps when we are used
1371 * by diff-cache --cached, which does read the cache before
1372 * calling us.
1373 */
1374 if (!active_cache)
1375 return 0;
1376
1377 /* We want to avoid the working directory if our caller
1378 * doesn't need the data in a normal file, this system
1379 * is rather slow with its stat/open/mmap/close syscalls,
1380 * and the object is contained in a pack file. The pack
1381 * is probably already open and will be faster to obtain
1382 * the data through than the working directory. Loose
1383 * objects however would tend to be slower as they need
1384 * to be individually opened and inflated.
1385 */
1386 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1387 return 0;
1388
1389 len = strlen(name);
1390 pos = cache_name_pos(name, len);
1391 if (pos < 0)
1392 return 0;
1393 ce = active_cache[pos];
1394 if ((lstat(name, &st) < 0) ||
1395 !S_ISREG(st.st_mode) || /* careful! */
1396 ce_match_stat(ce, &st, 0) ||
1397 hashcmp(sha1, ce->sha1))
1398 return 0;
1399 /* we return 1 only when we can stat, it is a regular file,
1400 * stat information matches, and sha1 recorded in the cache
1401 * matches. I.e. we know the file in the work tree really is
1402 * the same as the <name, sha1> pair.
1403 */
1404 return 1;
1405 }
1406
1407 static int populate_from_stdin(struct diff_filespec *s)
1408 {
1409 #define INCREMENT 1024
1410 char *buf;
1411 unsigned long size;
1412 ssize_t got;
1413
1414 size = 0;
1415 buf = NULL;
1416 while (1) {
1417 buf = xrealloc(buf, size + INCREMENT);
1418 got = xread(0, buf + size, INCREMENT);
1419 if (!got)
1420 break; /* EOF */
1421 if (got < 0)
1422 return error("error while reading from stdin %s",
1423 strerror(errno));
1424 size += got;
1425 }
1426 s->should_munmap = 0;
1427 s->data = buf;
1428 s->size = size;
1429 s->should_free = 1;
1430 return 0;
1431 }
1432
1433 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1434 {
1435 int len;
1436 char *data = xmalloc(100);
1437 len = snprintf(data, 100,
1438 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1439 s->data = data;
1440 s->size = len;
1441 s->should_free = 1;
1442 if (size_only) {
1443 s->data = NULL;
1444 free(data);
1445 }
1446 return 0;
1447 }
1448
1449 /*
1450 * While doing rename detection and pickaxe operation, we may need to
1451 * grab the data for the blob (or file) for our own in-core comparison.
1452 * diff_filespec has data and size fields for this purpose.
1453 */
1454 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1455 {
1456 int err = 0;
1457 if (!DIFF_FILE_VALID(s))
1458 die("internal error: asking to populate invalid file.");
1459 if (S_ISDIR(s->mode))
1460 return -1;
1461
1462 if (s->data)
1463 return 0;
1464
1465 if (size_only && 0 < s->size)
1466 return 0;
1467
1468 if (S_ISGITLINK(s->mode))
1469 return diff_populate_gitlink(s, size_only);
1470
1471 if (!s->sha1_valid ||
1472 reuse_worktree_file(s->path, s->sha1, 0)) {
1473 struct stat st;
1474 int fd;
1475 char *buf;
1476 unsigned long size;
1477
1478 if (!strcmp(s->path, "-"))
1479 return populate_from_stdin(s);
1480
1481 if (lstat(s->path, &st) < 0) {
1482 if (errno == ENOENT) {
1483 err_empty:
1484 err = -1;
1485 empty:
1486 s->data = (char *)"";
1487 s->size = 0;
1488 return err;
1489 }
1490 }
1491 s->size = xsize_t(st.st_size);
1492 if (!s->size)
1493 goto empty;
1494 if (size_only)
1495 return 0;
1496 if (S_ISLNK(st.st_mode)) {
1497 int ret;
1498 s->data = xmalloc(s->size);
1499 s->should_free = 1;
1500 ret = readlink(s->path, s->data, s->size);
1501 if (ret < 0) {
1502 free(s->data);
1503 goto err_empty;
1504 }
1505 return 0;
1506 }
1507 fd = open(s->path, O_RDONLY);
1508 if (fd < 0)
1509 goto err_empty;
1510 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1511 close(fd);
1512 s->should_munmap = 1;
1513
1514 /*
1515 * Convert from working tree format to canonical git format
1516 */
1517 size = s->size;
1518 buf = convert_to_git(s->path, s->data, &size);
1519 if (buf) {
1520 munmap(s->data, s->size);
1521 s->should_munmap = 0;
1522 s->data = buf;
1523 s->size = size;
1524 s->should_free = 1;
1525 }
1526 }
1527 else {
1528 enum object_type type;
1529 if (size_only)
1530 type = sha1_object_info(s->sha1, &s->size);
1531 else {
1532 s->data = read_sha1_file(s->sha1, &type, &s->size);
1533 s->should_free = 1;
1534 }
1535 }
1536 return 0;
1537 }
1538
1539 void diff_free_filespec_data(struct diff_filespec *s)
1540 {
1541 if (s->should_free)
1542 free(s->data);
1543 else if (s->should_munmap)
1544 munmap(s->data, s->size);
1545
1546 if (s->should_free || s->should_munmap) {
1547 s->should_free = s->should_munmap = 0;
1548 s->data = NULL;
1549 }
1550 free(s->cnt_data);
1551 s->cnt_data = NULL;
1552 }
1553
1554 static void prep_temp_blob(struct diff_tempfile *temp,
1555 void *blob,
1556 unsigned long size,
1557 const unsigned char *sha1,
1558 int mode)
1559 {
1560 int fd;
1561
1562 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1563 if (fd < 0)
1564 die("unable to create temp-file");
1565 if (write_in_full(fd, blob, size) != size)
1566 die("unable to write temp-file");
1567 close(fd);
1568 temp->name = temp->tmp_path;
1569 strcpy(temp->hex, sha1_to_hex(sha1));
1570 temp->hex[40] = 0;
1571 sprintf(temp->mode, "%06o", mode);
1572 }
1573
1574 static void prepare_temp_file(const char *name,
1575 struct diff_tempfile *temp,
1576 struct diff_filespec *one)
1577 {
1578 if (!DIFF_FILE_VALID(one)) {
1579 not_a_valid_file:
1580 /* A '-' entry produces this for file-2, and
1581 * a '+' entry produces this for file-1.
1582 */
1583 temp->name = "/dev/null";
1584 strcpy(temp->hex, ".");
1585 strcpy(temp->mode, ".");
1586 return;
1587 }
1588
1589 if (!one->sha1_valid ||
1590 reuse_worktree_file(name, one->sha1, 1)) {
1591 struct stat st;
1592 if (lstat(name, &st) < 0) {
1593 if (errno == ENOENT)
1594 goto not_a_valid_file;
1595 die("stat(%s): %s", name, strerror(errno));
1596 }
1597 if (S_ISLNK(st.st_mode)) {
1598 int ret;
1599 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1600 size_t sz = xsize_t(st.st_size);
1601 if (sizeof(buf) <= st.st_size)
1602 die("symlink too long: %s", name);
1603 ret = readlink(name, buf, sz);
1604 if (ret < 0)
1605 die("readlink(%s)", name);
1606 prep_temp_blob(temp, buf, sz,
1607 (one->sha1_valid ?
1608 one->sha1 : null_sha1),
1609 (one->sha1_valid ?
1610 one->mode : S_IFLNK));
1611 }
1612 else {
1613 /* we can borrow from the file in the work tree */
1614 temp->name = name;
1615 if (!one->sha1_valid)
1616 strcpy(temp->hex, sha1_to_hex(null_sha1));
1617 else
1618 strcpy(temp->hex, sha1_to_hex(one->sha1));
1619 /* Even though we may sometimes borrow the
1620 * contents from the work tree, we always want
1621 * one->mode. mode is trustworthy even when
1622 * !(one->sha1_valid), as long as
1623 * DIFF_FILE_VALID(one).
1624 */
1625 sprintf(temp->mode, "%06o", one->mode);
1626 }
1627 return;
1628 }
1629 else {
1630 if (diff_populate_filespec(one, 0))
1631 die("cannot read data blob for %s", one->path);
1632 prep_temp_blob(temp, one->data, one->size,
1633 one->sha1, one->mode);
1634 }
1635 }
1636
1637 static void remove_tempfile(void)
1638 {
1639 int i;
1640
1641 for (i = 0; i < 2; i++)
1642 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1643 unlink(diff_temp[i].name);
1644 diff_temp[i].name = NULL;
1645 }
1646 }
1647
1648 static void remove_tempfile_on_signal(int signo)
1649 {
1650 remove_tempfile();
1651 signal(SIGINT, SIG_DFL);
1652 raise(signo);
1653 }
1654
1655 static int spawn_prog(const char *pgm, const char **arg)
1656 {
1657 pid_t pid;
1658 int status;
1659
1660 fflush(NULL);
1661 pid = fork();
1662 if (pid < 0)
1663 die("unable to fork");
1664 if (!pid) {
1665 execvp(pgm, (char *const*) arg);
1666 exit(255);
1667 }
1668
1669 while (waitpid(pid, &status, 0) < 0) {
1670 if (errno == EINTR)
1671 continue;
1672 return -1;
1673 }
1674
1675 /* Earlier we did not check the exit status because
1676 * diff exits non-zero if files are different, and
1677 * we are not interested in knowing that. It was a
1678 * mistake which made it harder to quit a diff-*
1679 * session that uses the git-apply-patch-script as
1680 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1681 * should also exit non-zero only when it wants to
1682 * abort the entire diff-* session.
1683 */
1684 if (WIFEXITED(status) && !WEXITSTATUS(status))
1685 return 0;
1686 return -1;
1687 }
1688
1689 /* An external diff command takes:
1690 *
1691 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1692 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1693 *
1694 */
1695 static void run_external_diff(const char *pgm,
1696 const char *name,
1697 const char *other,
1698 struct diff_filespec *one,
1699 struct diff_filespec *two,
1700 const char *xfrm_msg,
1701 int complete_rewrite)
1702 {
1703 const char *spawn_arg[10];
1704 struct diff_tempfile *temp = diff_temp;
1705 int retval;
1706 static int atexit_asked = 0;
1707 const char *othername;
1708 const char **arg = &spawn_arg[0];
1709
1710 othername = (other? other : name);
1711 if (one && two) {
1712 prepare_temp_file(name, &temp[0], one);
1713 prepare_temp_file(othername, &temp[1], two);
1714 if (! atexit_asked &&
1715 (temp[0].name == temp[0].tmp_path ||
1716 temp[1].name == temp[1].tmp_path)) {
1717 atexit_asked = 1;
1718 atexit(remove_tempfile);
1719 }
1720 signal(SIGINT, remove_tempfile_on_signal);
1721 }
1722
1723 if (one && two) {
1724 *arg++ = pgm;
1725 *arg++ = name;
1726 *arg++ = temp[0].name;
1727 *arg++ = temp[0].hex;
1728 *arg++ = temp[0].mode;
1729 *arg++ = temp[1].name;
1730 *arg++ = temp[1].hex;
1731 *arg++ = temp[1].mode;
1732 if (other) {
1733 *arg++ = other;
1734 *arg++ = xfrm_msg;
1735 }
1736 } else {
1737 *arg++ = pgm;
1738 *arg++ = name;
1739 }
1740 *arg = NULL;
1741 retval = spawn_prog(pgm, spawn_arg);
1742 remove_tempfile();
1743 if (retval) {
1744 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1745 exit(1);
1746 }
1747 }
1748
1749 static const char *external_diff_attr(const char *name)
1750 {
1751 struct git_attr_check attr_diff_check;
1752
1753 setup_diff_attr_check(&attr_diff_check);
1754 if (!git_checkattr(name, 1, &attr_diff_check)) {
1755 const char *value = attr_diff_check.value;
1756 if (!ATTR_TRUE(value) &&
1757 !ATTR_FALSE(value) &&
1758 !ATTR_UNSET(value)) {
1759 struct ll_diff_driver *drv;
1760
1761 if (!user_diff_tail) {
1762 user_diff_tail = &user_diff;
1763 git_config(git_diff_ui_config);
1764 }
1765 for (drv = user_diff; drv; drv = drv->next)
1766 if (!strcmp(drv->name, value))
1767 return drv->cmd;
1768 }
1769 }
1770 return NULL;
1771 }
1772
1773 static void run_diff_cmd(const char *pgm,
1774 const char *name,
1775 const char *other,
1776 struct diff_filespec *one,
1777 struct diff_filespec *two,
1778 const char *xfrm_msg,
1779 struct diff_options *o,
1780 int complete_rewrite)
1781 {
1782 if (!o->allow_external)
1783 pgm = NULL;
1784 else {
1785 const char *cmd = external_diff_attr(name);
1786 if (cmd)
1787 pgm = cmd;
1788 }
1789
1790 if (pgm) {
1791 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1792 complete_rewrite);
1793 return;
1794 }
1795 if (one && two)
1796 builtin_diff(name, other ? other : name,
1797 one, two, xfrm_msg, o, complete_rewrite);
1798 else
1799 printf("* Unmerged path %s\n", name);
1800 }
1801
1802 static void diff_fill_sha1_info(struct diff_filespec *one)
1803 {
1804 if (DIFF_FILE_VALID(one)) {
1805 if (!one->sha1_valid) {
1806 struct stat st;
1807 if (!strcmp(one->path, "-")) {
1808 hashcpy(one->sha1, null_sha1);
1809 return;
1810 }
1811 if (lstat(one->path, &st) < 0)
1812 die("stat %s", one->path);
1813 if (index_path(one->sha1, one->path, &st, 0))
1814 die("cannot hash %s\n", one->path);
1815 }
1816 }
1817 else
1818 hashclr(one->sha1);
1819 }
1820
1821 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1822 {
1823 const char *pgm = external_diff();
1824 char msg[PATH_MAX*2+300], *xfrm_msg;
1825 struct diff_filespec *one;
1826 struct diff_filespec *two;
1827 const char *name;
1828 const char *other;
1829 char *name_munged, *other_munged;
1830 int complete_rewrite = 0;
1831 int len;
1832
1833 if (DIFF_PAIR_UNMERGED(p)) {
1834 /* unmerged */
1835 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1836 return;
1837 }
1838
1839 name = p->one->path;
1840 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1841 name_munged = quote_one(name);
1842 other_munged = quote_one(other);
1843 one = p->one; two = p->two;
1844
1845 diff_fill_sha1_info(one);
1846 diff_fill_sha1_info(two);
1847
1848 len = 0;
1849 switch (p->status) {
1850 case DIFF_STATUS_COPIED:
1851 len += snprintf(msg + len, sizeof(msg) - len,
1852 "similarity index %d%%\n"
1853 "copy from %s\n"
1854 "copy to %s\n",
1855 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1856 name_munged, other_munged);
1857 break;
1858 case DIFF_STATUS_RENAMED:
1859 len += snprintf(msg + len, sizeof(msg) - len,
1860 "similarity index %d%%\n"
1861 "rename from %s\n"
1862 "rename to %s\n",
1863 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1864 name_munged, other_munged);
1865 break;
1866 case DIFF_STATUS_MODIFIED:
1867 if (p->score) {
1868 len += snprintf(msg + len, sizeof(msg) - len,
1869 "dissimilarity index %d%%\n",
1870 (int)(0.5 + p->score *
1871 100.0/MAX_SCORE));
1872 complete_rewrite = 1;
1873 break;
1874 }
1875 /* fallthru */
1876 default:
1877 /* nothing */
1878 ;
1879 }
1880
1881 if (hashcmp(one->sha1, two->sha1)) {
1882 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1883
1884 if (o->binary) {
1885 mmfile_t mf;
1886 if ((!fill_mmfile(&mf, one) && file_is_binary(one)) ||
1887 (!fill_mmfile(&mf, two) && file_is_binary(two)))
1888 abbrev = 40;
1889 }
1890 len += snprintf(msg + len, sizeof(msg) - len,
1891 "index %.*s..%.*s",
1892 abbrev, sha1_to_hex(one->sha1),
1893 abbrev, sha1_to_hex(two->sha1));
1894 if (one->mode == two->mode)
1895 len += snprintf(msg + len, sizeof(msg) - len,
1896 " %06o", one->mode);
1897 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1898 }
1899
1900 if (len)
1901 msg[--len] = 0;
1902 xfrm_msg = len ? msg : NULL;
1903
1904 if (!pgm &&
1905 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1906 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1907 /* a filepair that changes between file and symlink
1908 * needs to be split into deletion and creation.
1909 */
1910 struct diff_filespec *null = alloc_filespec(two->path);
1911 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1912 free(null);
1913 null = alloc_filespec(one->path);
1914 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1915 free(null);
1916 }
1917 else
1918 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1919 complete_rewrite);
1920
1921 free(name_munged);
1922 free(other_munged);
1923 }
1924
1925 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1926 struct diffstat_t *diffstat)
1927 {
1928 const char *name;
1929 const char *other;
1930 int complete_rewrite = 0;
1931
1932 if (DIFF_PAIR_UNMERGED(p)) {
1933 /* unmerged */
1934 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1935 return;
1936 }
1937
1938 name = p->one->path;
1939 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1940
1941 diff_fill_sha1_info(p->one);
1942 diff_fill_sha1_info(p->two);
1943
1944 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1945 complete_rewrite = 1;
1946 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
1947 }
1948
1949 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1950 {
1951 const char *name;
1952 const char *other;
1953
1954 if (DIFF_PAIR_UNMERGED(p)) {
1955 /* unmerged */
1956 return;
1957 }
1958
1959 name = p->one->path;
1960 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1961
1962 diff_fill_sha1_info(p->one);
1963 diff_fill_sha1_info(p->two);
1964
1965 builtin_checkdiff(name, other, p->one, p->two, o);
1966 }
1967
1968 void diff_setup(struct diff_options *options)
1969 {
1970 memset(options, 0, sizeof(*options));
1971 options->line_termination = '\n';
1972 options->break_opt = -1;
1973 options->rename_limit = -1;
1974 options->context = 3;
1975 options->msg_sep = "";
1976
1977 options->change = diff_change;
1978 options->add_remove = diff_addremove;
1979 options->color_diff = diff_use_color_default;
1980 options->detect_rename = diff_detect_rename_default;
1981 }
1982
1983 int diff_setup_done(struct diff_options *options)
1984 {
1985 int count = 0;
1986
1987 if (options->output_format & DIFF_FORMAT_NAME)
1988 count++;
1989 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
1990 count++;
1991 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
1992 count++;
1993 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
1994 count++;
1995 if (count > 1)
1996 die("--name-only, --name-status, --check and -s are mutually exclusive");
1997
1998 if (options->find_copies_harder)
1999 options->detect_rename = DIFF_DETECT_COPY;
2000
2001 if (options->output_format & (DIFF_FORMAT_NAME |
2002 DIFF_FORMAT_NAME_STATUS |
2003 DIFF_FORMAT_CHECKDIFF |
2004 DIFF_FORMAT_NO_OUTPUT))
2005 options->output_format &= ~(DIFF_FORMAT_RAW |
2006 DIFF_FORMAT_NUMSTAT |
2007 DIFF_FORMAT_DIFFSTAT |
2008 DIFF_FORMAT_SHORTSTAT |
2009 DIFF_FORMAT_SUMMARY |
2010 DIFF_FORMAT_PATCH);
2011
2012 /*
2013 * These cases always need recursive; we do not drop caller-supplied
2014 * recursive bits for other formats here.
2015 */
2016 if (options->output_format & (DIFF_FORMAT_PATCH |
2017 DIFF_FORMAT_NUMSTAT |
2018 DIFF_FORMAT_DIFFSTAT |
2019 DIFF_FORMAT_SHORTSTAT |
2020 DIFF_FORMAT_SUMMARY |
2021 DIFF_FORMAT_CHECKDIFF))
2022 options->recursive = 1;
2023 /*
2024 * Also pickaxe would not work very well if you do not say recursive
2025 */
2026 if (options->pickaxe)
2027 options->recursive = 1;
2028
2029 if (options->detect_rename && options->rename_limit < 0)
2030 options->rename_limit = diff_rename_limit_default;
2031 if (options->setup & DIFF_SETUP_USE_CACHE) {
2032 if (!active_cache)
2033 /* read-cache does not die even when it fails
2034 * so it is safe for us to do this here. Also
2035 * it does not smudge active_cache or active_nr
2036 * when it fails, so we do not have to worry about
2037 * cleaning it up ourselves either.
2038 */
2039 read_cache();
2040 }
2041 if (options->abbrev <= 0 || 40 < options->abbrev)
2042 options->abbrev = 40; /* full */
2043
2044 /*
2045 * It does not make sense to show the first hit we happened
2046 * to have found. It does not make sense not to return with
2047 * exit code in such a case either.
2048 */
2049 if (options->quiet) {
2050 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2051 options->exit_with_status = 1;
2052 }
2053
2054 /*
2055 * If we postprocess in diffcore, we cannot simply return
2056 * upon the first hit. We need to run diff as usual.
2057 */
2058 if (options->pickaxe || options->filter)
2059 options->quiet = 0;
2060
2061 return 0;
2062 }
2063
2064 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2065 {
2066 char c, *eq;
2067 int len;
2068
2069 if (*arg != '-')
2070 return 0;
2071 c = *++arg;
2072 if (!c)
2073 return 0;
2074 if (c == arg_short) {
2075 c = *++arg;
2076 if (!c)
2077 return 1;
2078 if (val && isdigit(c)) {
2079 char *end;
2080 int n = strtoul(arg, &end, 10);
2081 if (*end)
2082 return 0;
2083 *val = n;
2084 return 1;
2085 }
2086 return 0;
2087 }
2088 if (c != '-')
2089 return 0;
2090 arg++;
2091 eq = strchr(arg, '=');
2092 if (eq)
2093 len = eq - arg;
2094 else
2095 len = strlen(arg);
2096 if (!len || strncmp(arg, arg_long, len))
2097 return 0;
2098 if (eq) {
2099 int n;
2100 char *end;
2101 if (!isdigit(*++eq))
2102 return 0;
2103 n = strtoul(eq, &end, 10);
2104 if (*end)
2105 return 0;
2106 *val = n;
2107 }
2108 return 1;
2109 }
2110
2111 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2112 {
2113 const char *arg = av[0];
2114 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2115 options->output_format |= DIFF_FORMAT_PATCH;
2116 else if (opt_arg(arg, 'U', "unified", &options->context))
2117 options->output_format |= DIFF_FORMAT_PATCH;
2118 else if (!strcmp(arg, "--raw"))
2119 options->output_format |= DIFF_FORMAT_RAW;
2120 else if (!strcmp(arg, "--patch-with-raw")) {
2121 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2122 }
2123 else if (!strcmp(arg, "--numstat")) {
2124 options->output_format |= DIFF_FORMAT_NUMSTAT;
2125 }
2126 else if (!strcmp(arg, "--shortstat")) {
2127 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2128 }
2129 else if (!prefixcmp(arg, "--stat")) {
2130 char *end;
2131 int width = options->stat_width;
2132 int name_width = options->stat_name_width;
2133 arg += 6;
2134 end = (char *)arg;
2135
2136 switch (*arg) {
2137 case '-':
2138 if (!prefixcmp(arg, "-width="))
2139 width = strtoul(arg + 7, &end, 10);
2140 else if (!prefixcmp(arg, "-name-width="))
2141 name_width = strtoul(arg + 12, &end, 10);
2142 break;
2143 case '=':
2144 width = strtoul(arg+1, &end, 10);
2145 if (*end == ',')
2146 name_width = strtoul(end+1, &end, 10);
2147 }
2148
2149 /* Important! This checks all the error cases! */
2150 if (*end)
2151 return 0;
2152 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2153 options->stat_name_width = name_width;
2154 options->stat_width = width;
2155 }
2156 else if (!strcmp(arg, "--check"))
2157 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2158 else if (!strcmp(arg, "--summary"))
2159 options->output_format |= DIFF_FORMAT_SUMMARY;
2160 else if (!strcmp(arg, "--patch-with-stat")) {
2161 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2162 }
2163 else if (!strcmp(arg, "-z"))
2164 options->line_termination = 0;
2165 else if (!prefixcmp(arg, "-l"))
2166 options->rename_limit = strtoul(arg+2, NULL, 10);
2167 else if (!strcmp(arg, "--full-index"))
2168 options->full_index = 1;
2169 else if (!strcmp(arg, "--binary")) {
2170 options->output_format |= DIFF_FORMAT_PATCH;
2171 options->binary = 1;
2172 }
2173 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
2174 options->text = 1;
2175 }
2176 else if (!strcmp(arg, "--name-only"))
2177 options->output_format |= DIFF_FORMAT_NAME;
2178 else if (!strcmp(arg, "--name-status"))
2179 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2180 else if (!strcmp(arg, "-R"))
2181 options->reverse_diff = 1;
2182 else if (!prefixcmp(arg, "-S"))
2183 options->pickaxe = arg + 2;
2184 else if (!strcmp(arg, "-s")) {
2185 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2186 }
2187 else if (!prefixcmp(arg, "-O"))
2188 options->orderfile = arg + 2;
2189 else if (!prefixcmp(arg, "--diff-filter="))
2190 options->filter = arg + 14;
2191 else if (!strcmp(arg, "--pickaxe-all"))
2192 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2193 else if (!strcmp(arg, "--pickaxe-regex"))
2194 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2195 else if (!prefixcmp(arg, "-B")) {
2196 if ((options->break_opt =
2197 diff_scoreopt_parse(arg)) == -1)
2198 return -1;
2199 }
2200 else if (!prefixcmp(arg, "-M")) {
2201 if ((options->rename_score =
2202 diff_scoreopt_parse(arg)) == -1)
2203 return -1;
2204 options->detect_rename = DIFF_DETECT_RENAME;
2205 }
2206 else if (!prefixcmp(arg, "-C")) {
2207 if ((options->rename_score =
2208 diff_scoreopt_parse(arg)) == -1)
2209 return -1;
2210 options->detect_rename = DIFF_DETECT_COPY;
2211 }
2212 else if (!strcmp(arg, "--find-copies-harder"))
2213 options->find_copies_harder = 1;
2214 else if (!strcmp(arg, "--abbrev"))
2215 options->abbrev = DEFAULT_ABBREV;
2216 else if (!prefixcmp(arg, "--abbrev=")) {
2217 options->abbrev = strtoul(arg + 9, NULL, 10);
2218 if (options->abbrev < MINIMUM_ABBREV)
2219 options->abbrev = MINIMUM_ABBREV;
2220 else if (40 < options->abbrev)
2221 options->abbrev = 40;
2222 }
2223 else if (!strcmp(arg, "--color"))
2224 options->color_diff = 1;
2225 else if (!strcmp(arg, "--no-color"))
2226 options->color_diff = 0;
2227 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2228 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2229 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2230 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2231 else if (!strcmp(arg, "--ignore-space-at-eol"))
2232 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2233 else if (!strcmp(arg, "--color-words"))
2234 options->color_diff = options->color_diff_words = 1;
2235 else if (!strcmp(arg, "--no-renames"))
2236 options->detect_rename = 0;
2237 else if (!strcmp(arg, "--exit-code"))
2238 options->exit_with_status = 1;
2239 else if (!strcmp(arg, "--quiet"))
2240 options->quiet = 1;
2241 else
2242 return 0;
2243 return 1;
2244 }
2245
2246 static int parse_num(const char **cp_p)
2247 {
2248 unsigned long num, scale;
2249 int ch, dot;
2250 const char *cp = *cp_p;
2251
2252 num = 0;
2253 scale = 1;
2254 dot = 0;
2255 for(;;) {
2256 ch = *cp;
2257 if ( !dot && ch == '.' ) {
2258 scale = 1;
2259 dot = 1;
2260 } else if ( ch == '%' ) {
2261 scale = dot ? scale*100 : 100;
2262 cp++; /* % is always at the end */
2263 break;
2264 } else if ( ch >= '0' && ch <= '9' ) {
2265 if ( scale < 100000 ) {
2266 scale *= 10;
2267 num = (num*10) + (ch-'0');
2268 }
2269 } else {
2270 break;
2271 }
2272 cp++;
2273 }
2274 *cp_p = cp;
2275
2276 /* user says num divided by scale and we say internally that
2277 * is MAX_SCORE * num / scale.
2278 */
2279 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2280 }
2281
2282 int diff_scoreopt_parse(const char *opt)
2283 {
2284 int opt1, opt2, cmd;
2285
2286 if (*opt++ != '-')
2287 return -1;
2288 cmd = *opt++;
2289 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2290 return -1; /* that is not a -M, -C nor -B option */
2291
2292 opt1 = parse_num(&opt);
2293 if (cmd != 'B')
2294 opt2 = 0;
2295 else {
2296 if (*opt == 0)
2297 opt2 = 0;
2298 else if (*opt != '/')
2299 return -1; /* we expect -B80/99 or -B80 */
2300 else {
2301 opt++;
2302 opt2 = parse_num(&opt);
2303 }
2304 }
2305 if (*opt != 0)
2306 return -1;
2307 return opt1 | (opt2 << 16);
2308 }
2309
2310 struct diff_queue_struct diff_queued_diff;
2311
2312 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2313 {
2314 if (queue->alloc <= queue->nr) {
2315 queue->alloc = alloc_nr(queue->alloc);
2316 queue->queue = xrealloc(queue->queue,
2317 sizeof(dp) * queue->alloc);
2318 }
2319 queue->queue[queue->nr++] = dp;
2320 }
2321
2322 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2323 struct diff_filespec *one,
2324 struct diff_filespec *two)
2325 {
2326 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2327 dp->one = one;
2328 dp->two = two;
2329 if (queue)
2330 diff_q(queue, dp);
2331 return dp;
2332 }
2333
2334 void diff_free_filepair(struct diff_filepair *p)
2335 {
2336 diff_free_filespec_data(p->one);
2337 diff_free_filespec_data(p->two);
2338 free(p->one);
2339 free(p->two);
2340 free(p);
2341 }
2342
2343 /* This is different from find_unique_abbrev() in that
2344 * it stuffs the result with dots for alignment.
2345 */
2346 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2347 {
2348 int abblen;
2349 const char *abbrev;
2350 if (len == 40)
2351 return sha1_to_hex(sha1);
2352
2353 abbrev = find_unique_abbrev(sha1, len);
2354 if (!abbrev)
2355 return sha1_to_hex(sha1);
2356 abblen = strlen(abbrev);
2357 if (abblen < 37) {
2358 static char hex[41];
2359 if (len < abblen && abblen <= len + 2)
2360 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2361 else
2362 sprintf(hex, "%s...", abbrev);
2363 return hex;
2364 }
2365 return sha1_to_hex(sha1);
2366 }
2367
2368 static void diff_flush_raw(struct diff_filepair *p,
2369 struct diff_options *options)
2370 {
2371 int two_paths;
2372 char status[10];
2373 int abbrev = options->abbrev;
2374 const char *path_one, *path_two;
2375 int inter_name_termination = '\t';
2376 int line_termination = options->line_termination;
2377
2378 if (!line_termination)
2379 inter_name_termination = 0;
2380
2381 path_one = p->one->path;
2382 path_two = p->two->path;
2383 if (line_termination) {
2384 path_one = quote_one(path_one);
2385 path_two = quote_one(path_two);
2386 }
2387
2388 if (p->score)
2389 sprintf(status, "%c%03d", p->status,
2390 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2391 else {
2392 status[0] = p->status;
2393 status[1] = 0;
2394 }
2395 switch (p->status) {
2396 case DIFF_STATUS_COPIED:
2397 case DIFF_STATUS_RENAMED:
2398 two_paths = 1;
2399 break;
2400 case DIFF_STATUS_ADDED:
2401 case DIFF_STATUS_DELETED:
2402 two_paths = 0;
2403 break;
2404 default:
2405 two_paths = 0;
2406 break;
2407 }
2408 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
2409 printf(":%06o %06o %s ",
2410 p->one->mode, p->two->mode,
2411 diff_unique_abbrev(p->one->sha1, abbrev));
2412 printf("%s ",
2413 diff_unique_abbrev(p->two->sha1, abbrev));
2414 }
2415 printf("%s%c%s", status, inter_name_termination, path_one);
2416 if (two_paths)
2417 printf("%c%s", inter_name_termination, path_two);
2418 putchar(line_termination);
2419 if (path_one != p->one->path)
2420 free((void*)path_one);
2421 if (path_two != p->two->path)
2422 free((void*)path_two);
2423 }
2424
2425 static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
2426 {
2427 char *path = p->two->path;
2428
2429 if (opt->line_termination)
2430 path = quote_one(p->two->path);
2431 printf("%s%c", path, opt->line_termination);
2432 if (p->two->path != path)
2433 free(path);
2434 }
2435
2436 int diff_unmodified_pair(struct diff_filepair *p)
2437 {
2438 /* This function is written stricter than necessary to support
2439 * the currently implemented transformers, but the idea is to
2440 * let transformers to produce diff_filepairs any way they want,
2441 * and filter and clean them up here before producing the output.
2442 */
2443 struct diff_filespec *one, *two;
2444
2445 if (DIFF_PAIR_UNMERGED(p))
2446 return 0; /* unmerged is interesting */
2447
2448 one = p->one;
2449 two = p->two;
2450
2451 /* deletion, addition, mode or type change
2452 * and rename are all interesting.
2453 */
2454 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2455 DIFF_PAIR_MODE_CHANGED(p) ||
2456 strcmp(one->path, two->path))
2457 return 0;
2458
2459 /* both are valid and point at the same path. that is, we are
2460 * dealing with a change.
2461 */
2462 if (one->sha1_valid && two->sha1_valid &&
2463 !hashcmp(one->sha1, two->sha1))
2464 return 1; /* no change */
2465 if (!one->sha1_valid && !two->sha1_valid)
2466 return 1; /* both look at the same file on the filesystem. */
2467 return 0;
2468 }
2469
2470 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2471 {
2472 if (diff_unmodified_pair(p))
2473 return;
2474
2475 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2476 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2477 return; /* no tree diffs in patch format */
2478
2479 run_diff(p, o);
2480 }
2481
2482 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2483 struct diffstat_t *diffstat)
2484 {
2485 if (diff_unmodified_pair(p))
2486 return;
2487
2488 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2489 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2490 return; /* no tree diffs in patch format */
2491
2492 run_diffstat(p, o, diffstat);
2493 }
2494
2495 static void diff_flush_checkdiff(struct diff_filepair *p,
2496 struct diff_options *o)
2497 {
2498 if (diff_unmodified_pair(p))
2499 return;
2500
2501 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2502 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2503 return; /* no tree diffs in patch format */
2504
2505 run_checkdiff(p, o);
2506 }
2507
2508 int diff_queue_is_empty(void)
2509 {
2510 struct diff_queue_struct *q = &diff_queued_diff;
2511 int i;
2512 for (i = 0; i < q->nr; i++)
2513 if (!diff_unmodified_pair(q->queue[i]))
2514 return 0;
2515 return 1;
2516 }
2517
2518 #if DIFF_DEBUG
2519 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2520 {
2521 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2522 x, one ? one : "",
2523 s->path,
2524 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2525 s->mode,
2526 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2527 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2528 x, one ? one : "",
2529 s->size, s->xfrm_flags);
2530 }
2531
2532 void diff_debug_filepair(const struct diff_filepair *p, int i)
2533 {
2534 diff_debug_filespec(p->one, i, "one");
2535 diff_debug_filespec(p->two, i, "two");
2536 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2537 p->score, p->status ? p->status : '?',
2538 p->source_stays, p->broken_pair);
2539 }
2540
2541 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2542 {
2543 int i;
2544 if (msg)
2545 fprintf(stderr, "%s\n", msg);
2546 fprintf(stderr, "q->nr = %d\n", q->nr);
2547 for (i = 0; i < q->nr; i++) {
2548 struct diff_filepair *p = q->queue[i];
2549 diff_debug_filepair(p, i);
2550 }
2551 }
2552 #endif
2553
2554 static void diff_resolve_rename_copy(void)
2555 {
2556 int i, j;
2557 struct diff_filepair *p, *pp;
2558 struct diff_queue_struct *q = &diff_queued_diff;
2559
2560 diff_debug_queue("resolve-rename-copy", q);
2561
2562 for (i = 0; i < q->nr; i++) {
2563 p = q->queue[i];
2564 p->status = 0; /* undecided */
2565 if (DIFF_PAIR_UNMERGED(p))
2566 p->status = DIFF_STATUS_UNMERGED;
2567 else if (!DIFF_FILE_VALID(p->one))
2568 p->status = DIFF_STATUS_ADDED;
2569 else if (!DIFF_FILE_VALID(p->two))
2570 p->status = DIFF_STATUS_DELETED;
2571 else if (DIFF_PAIR_TYPE_CHANGED(p))
2572 p->status = DIFF_STATUS_TYPE_CHANGED;
2573
2574 /* from this point on, we are dealing with a pair
2575 * whose both sides are valid and of the same type, i.e.
2576 * either in-place edit or rename/copy edit.
2577 */
2578 else if (DIFF_PAIR_RENAME(p)) {
2579 if (p->source_stays) {
2580 p->status = DIFF_STATUS_COPIED;
2581 continue;
2582 }
2583 /* See if there is some other filepair that
2584 * copies from the same source as us. If so
2585 * we are a copy. Otherwise we are either a
2586 * copy if the path stays, or a rename if it
2587 * does not, but we already handled "stays" case.
2588 */
2589 for (j = i + 1; j < q->nr; j++) {
2590 pp = q->queue[j];
2591 if (strcmp(pp->one->path, p->one->path))
2592 continue; /* not us */
2593 if (!DIFF_PAIR_RENAME(pp))
2594 continue; /* not a rename/copy */
2595 /* pp is a rename/copy from the same source */
2596 p->status = DIFF_STATUS_COPIED;
2597 break;
2598 }
2599 if (!p->status)
2600 p->status = DIFF_STATUS_RENAMED;
2601 }
2602 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2603 p->one->mode != p->two->mode ||
2604 is_null_sha1(p->one->sha1))
2605 p->status = DIFF_STATUS_MODIFIED;
2606 else {
2607 /* This is a "no-change" entry and should not
2608 * happen anymore, but prepare for broken callers.
2609 */
2610 error("feeding unmodified %s to diffcore",
2611 p->one->path);
2612 p->status = DIFF_STATUS_UNKNOWN;
2613 }
2614 }
2615 diff_debug_queue("resolve-rename-copy done", q);
2616 }
2617
2618 static int check_pair_status(struct diff_filepair *p)
2619 {
2620 switch (p->status) {
2621 case DIFF_STATUS_UNKNOWN:
2622 return 0;
2623 case 0:
2624 die("internal error in diff-resolve-rename-copy");
2625 default:
2626 return 1;
2627 }
2628 }
2629
2630 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2631 {
2632 int fmt = opt->output_format;
2633
2634 if (fmt & DIFF_FORMAT_CHECKDIFF)
2635 diff_flush_checkdiff(p, opt);
2636 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2637 diff_flush_raw(p, opt);
2638 else if (fmt & DIFF_FORMAT_NAME)
2639 diff_flush_name(p, opt);
2640 }
2641
2642 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2643 {
2644 char *name = quote_one(fs->path);
2645 if (fs->mode)
2646 printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
2647 else
2648 printf(" %s %s\n", newdelete, name);
2649 free(name);
2650 }
2651
2652
2653 static void show_mode_change(struct diff_filepair *p, int show_name)
2654 {
2655 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2656 if (show_name) {
2657 char *name = quote_one(p->two->path);
2658 printf(" mode change %06o => %06o %s\n",
2659 p->one->mode, p->two->mode, name);
2660 free(name);
2661 }
2662 else
2663 printf(" mode change %06o => %06o\n",
2664 p->one->mode, p->two->mode);
2665 }
2666 }
2667
2668 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2669 {
2670 char *names = pprint_rename(p->one->path, p->two->path);
2671
2672 printf(" %s %s (%d%%)\n", renamecopy, names,
2673 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2674 free(names);
2675 show_mode_change(p, 0);
2676 }
2677
2678 static void diff_summary(struct diff_filepair *p)
2679 {
2680 switch(p->status) {
2681 case DIFF_STATUS_DELETED:
2682 show_file_mode_name("delete", p->one);
2683 break;
2684 case DIFF_STATUS_ADDED:
2685 show_file_mode_name("create", p->two);
2686 break;
2687 case DIFF_STATUS_COPIED:
2688 show_rename_copy("copy", p);
2689 break;
2690 case DIFF_STATUS_RENAMED:
2691 show_rename_copy("rename", p);
2692 break;
2693 default:
2694 if (p->score) {
2695 char *name = quote_one(p->two->path);
2696 printf(" rewrite %s (%d%%)\n", name,
2697 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2698 free(name);
2699 show_mode_change(p, 0);
2700 } else show_mode_change(p, 1);
2701 break;
2702 }
2703 }
2704
2705 struct patch_id_t {
2706 struct xdiff_emit_state xm;
2707 SHA_CTX *ctx;
2708 int patchlen;
2709 };
2710
2711 static int remove_space(char *line, int len)
2712 {
2713 int i;
2714 char *dst = line;
2715 unsigned char c;
2716
2717 for (i = 0; i < len; i++)
2718 if (!isspace((c = line[i])))
2719 *dst++ = c;
2720
2721 return dst - line;
2722 }
2723
2724 static void patch_id_consume(void *priv, char *line, unsigned long len)
2725 {
2726 struct patch_id_t *data = priv;
2727 int new_len;
2728
2729 /* Ignore line numbers when computing the SHA1 of the patch */
2730 if (!prefixcmp(line, "@@ -"))
2731 return;
2732
2733 new_len = remove_space(line, len);
2734
2735 SHA1_Update(data->ctx, line, new_len);
2736 data->patchlen += new_len;
2737 }
2738
2739 /* returns 0 upon success, and writes result into sha1 */
2740 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2741 {
2742 struct diff_queue_struct *q = &diff_queued_diff;
2743 int i;
2744 SHA_CTX ctx;
2745 struct patch_id_t data;
2746 char buffer[PATH_MAX * 4 + 20];
2747
2748 SHA1_Init(&ctx);
2749 memset(&data, 0, sizeof(struct patch_id_t));
2750 data.ctx = &ctx;
2751 data.xm.consume = patch_id_consume;
2752
2753 for (i = 0; i < q->nr; i++) {
2754 xpparam_t xpp;
2755 xdemitconf_t xecfg;
2756 xdemitcb_t ecb;
2757 mmfile_t mf1, mf2;
2758 struct diff_filepair *p = q->queue[i];
2759 int len1, len2;
2760
2761 if (p->status == 0)
2762 return error("internal diff status error");
2763 if (p->status == DIFF_STATUS_UNKNOWN)
2764 continue;
2765 if (diff_unmodified_pair(p))
2766 continue;
2767 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2768 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2769 continue;
2770 if (DIFF_PAIR_UNMERGED(p))
2771 continue;
2772
2773 diff_fill_sha1_info(p->one);
2774 diff_fill_sha1_info(p->two);
2775 if (fill_mmfile(&mf1, p->one) < 0 ||
2776 fill_mmfile(&mf2, p->two) < 0)
2777 return error("unable to read files to diff");
2778
2779 /* Maybe hash p->two? into the patch id? */
2780 if (file_is_binary(p->two))
2781 continue;
2782
2783 len1 = remove_space(p->one->path, strlen(p->one->path));
2784 len2 = remove_space(p->two->path, strlen(p->two->path));
2785 if (p->one->mode == 0)
2786 len1 = snprintf(buffer, sizeof(buffer),
2787 "diff--gita/%.*sb/%.*s"
2788 "newfilemode%06o"
2789 "---/dev/null"
2790 "+++b/%.*s",
2791 len1, p->one->path,
2792 len2, p->two->path,
2793 p->two->mode,
2794 len2, p->two->path);
2795 else if (p->two->mode == 0)
2796 len1 = snprintf(buffer, sizeof(buffer),
2797 "diff--gita/%.*sb/%.*s"
2798 "deletedfilemode%06o"
2799 "---a/%.*s"
2800 "+++/dev/null",
2801 len1, p->one->path,
2802 len2, p->two->path,
2803 p->one->mode,
2804 len1, p->one->path);
2805 else
2806 len1 = snprintf(buffer, sizeof(buffer),
2807 "diff--gita/%.*sb/%.*s"
2808 "---a/%.*s"
2809 "+++b/%.*s",
2810 len1, p->one->path,
2811 len2, p->two->path,
2812 len1, p->one->path,
2813 len2, p->two->path);
2814 SHA1_Update(&ctx, buffer, len1);
2815
2816 xpp.flags = XDF_NEED_MINIMAL;
2817 xecfg.ctxlen = 3;
2818 xecfg.flags = XDL_EMIT_FUNCNAMES;
2819 ecb.outf = xdiff_outf;
2820 ecb.priv = &data;
2821 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2822 }
2823
2824 SHA1_Final(sha1, &ctx);
2825 return 0;
2826 }
2827
2828 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2829 {
2830 struct diff_queue_struct *q = &diff_queued_diff;
2831 int i;
2832 int result = diff_get_patch_id(options, sha1);
2833
2834 for (i = 0; i < q->nr; i++)
2835 diff_free_filepair(q->queue[i]);
2836
2837 free(q->queue);
2838 q->queue = NULL;
2839 q->nr = q->alloc = 0;
2840
2841 return result;
2842 }
2843
2844 static int is_summary_empty(const struct diff_queue_struct *q)
2845 {
2846 int i;
2847
2848 for (i = 0; i < q->nr; i++) {
2849 const struct diff_filepair *p = q->queue[i];
2850
2851 switch (p->status) {
2852 case DIFF_STATUS_DELETED:
2853 case DIFF_STATUS_ADDED:
2854 case DIFF_STATUS_COPIED:
2855 case DIFF_STATUS_RENAMED:
2856 return 0;
2857 default:
2858 if (p->score)
2859 return 0;
2860 if (p->one->mode && p->two->mode &&
2861 p->one->mode != p->two->mode)
2862 return 0;
2863 break;
2864 }
2865 }
2866 return 1;
2867 }
2868
2869 void diff_flush(struct diff_options *options)
2870 {
2871 struct diff_queue_struct *q = &diff_queued_diff;
2872 int i, output_format = options->output_format;
2873 int separator = 0;
2874
2875 /*
2876 * Order: raw, stat, summary, patch
2877 * or: name/name-status/checkdiff (other bits clear)
2878 */
2879 if (!q->nr)
2880 goto free_queue;
2881
2882 if (output_format & (DIFF_FORMAT_RAW |
2883 DIFF_FORMAT_NAME |
2884 DIFF_FORMAT_NAME_STATUS |
2885 DIFF_FORMAT_CHECKDIFF)) {
2886 for (i = 0; i < q->nr; i++) {
2887 struct diff_filepair *p = q->queue[i];
2888 if (check_pair_status(p))
2889 flush_one_pair(p, options);
2890 }
2891 separator++;
2892 }
2893
2894 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2895 struct diffstat_t diffstat;
2896
2897 memset(&diffstat, 0, sizeof(struct diffstat_t));
2898 diffstat.xm.consume = diffstat_consume;
2899 for (i = 0; i < q->nr; i++) {
2900 struct diff_filepair *p = q->queue[i];
2901 if (check_pair_status(p))
2902 diff_flush_stat(p, options, &diffstat);
2903 }
2904 if (output_format & DIFF_FORMAT_NUMSTAT)
2905 show_numstat(&diffstat, options);
2906 if (output_format & DIFF_FORMAT_DIFFSTAT)
2907 show_stats(&diffstat, options);
2908 else if (output_format & DIFF_FORMAT_SHORTSTAT)
2909 show_shortstats(&diffstat);
2910 separator++;
2911 }
2912
2913 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2914 for (i = 0; i < q->nr; i++)
2915 diff_summary(q->queue[i]);
2916 separator++;
2917 }
2918
2919 if (output_format & DIFF_FORMAT_PATCH) {
2920 if (separator) {
2921 if (options->stat_sep) {
2922 /* attach patch instead of inline */
2923 fputs(options->stat_sep, stdout);
2924 } else {
2925 putchar(options->line_termination);
2926 }
2927 }
2928
2929 for (i = 0; i < q->nr; i++) {
2930 struct diff_filepair *p = q->queue[i];
2931 if (check_pair_status(p))
2932 diff_flush_patch(p, options);
2933 }
2934 }
2935
2936 if (output_format & DIFF_FORMAT_CALLBACK)
2937 options->format_callback(q, options, options->format_callback_data);
2938
2939 for (i = 0; i < q->nr; i++)
2940 diff_free_filepair(q->queue[i]);
2941 free_queue:
2942 free(q->queue);
2943 q->queue = NULL;
2944 q->nr = q->alloc = 0;
2945 }
2946
2947 static void diffcore_apply_filter(const char *filter)
2948 {
2949 int i;
2950 struct diff_queue_struct *q = &diff_queued_diff;
2951 struct diff_queue_struct outq;
2952 outq.queue = NULL;
2953 outq.nr = outq.alloc = 0;
2954
2955 if (!filter)
2956 return;
2957
2958 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2959 int found;
2960 for (i = found = 0; !found && i < q->nr; i++) {
2961 struct diff_filepair *p = q->queue[i];
2962 if (((p->status == DIFF_STATUS_MODIFIED) &&
2963 ((p->score &&
2964 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2965 (!p->score &&
2966 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2967 ((p->status != DIFF_STATUS_MODIFIED) &&
2968 strchr(filter, p->status)))
2969 found++;
2970 }
2971 if (found)
2972 return;
2973
2974 /* otherwise we will clear the whole queue
2975 * by copying the empty outq at the end of this
2976 * function, but first clear the current entries
2977 * in the queue.
2978 */
2979 for (i = 0; i < q->nr; i++)
2980 diff_free_filepair(q->queue[i]);
2981 }
2982 else {
2983 /* Only the matching ones */
2984 for (i = 0; i < q->nr; i++) {
2985 struct diff_filepair *p = q->queue[i];
2986
2987 if (((p->status == DIFF_STATUS_MODIFIED) &&
2988 ((p->score &&
2989 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2990 (!p->score &&
2991 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2992 ((p->status != DIFF_STATUS_MODIFIED) &&
2993 strchr(filter, p->status)))
2994 diff_q(&outq, p);
2995 else
2996 diff_free_filepair(p);
2997 }
2998 }
2999 free(q->queue);
3000 *q = outq;
3001 }
3002
3003 void diffcore_std(struct diff_options *options)
3004 {
3005 if (options->quiet)
3006 return;
3007 if (options->break_opt != -1)
3008 diffcore_break(options->break_opt);
3009 if (options->detect_rename)
3010 diffcore_rename(options);
3011 if (options->break_opt != -1)
3012 diffcore_merge_broken();
3013 if (options->pickaxe)
3014 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3015 if (options->orderfile)
3016 diffcore_order(options->orderfile);
3017 diff_resolve_rename_copy();
3018 diffcore_apply_filter(options->filter);
3019
3020 options->has_changes = !!diff_queued_diff.nr;
3021 }
3022
3023
3024 void diff_addremove(struct diff_options *options,
3025 int addremove, unsigned mode,
3026 const unsigned char *sha1,
3027 const char *base, const char *path)
3028 {
3029 char concatpath[PATH_MAX];
3030 struct diff_filespec *one, *two;
3031
3032 /* This may look odd, but it is a preparation for
3033 * feeding "there are unchanged files which should
3034 * not produce diffs, but when you are doing copy
3035 * detection you would need them, so here they are"
3036 * entries to the diff-core. They will be prefixed
3037 * with something like '=' or '*' (I haven't decided
3038 * which but should not make any difference).
3039 * Feeding the same new and old to diff_change()
3040 * also has the same effect.
3041 * Before the final output happens, they are pruned after
3042 * merged into rename/copy pairs as appropriate.
3043 */
3044 if (options->reverse_diff)
3045 addremove = (addremove == '+' ? '-' :
3046 addremove == '-' ? '+' : addremove);
3047
3048 if (!path) path = "";
3049 sprintf(concatpath, "%s%s", base, path);
3050 one = alloc_filespec(concatpath);
3051 two = alloc_filespec(concatpath);
3052
3053 if (addremove != '+')
3054 fill_filespec(one, sha1, mode);
3055 if (addremove != '-')
3056 fill_filespec(two, sha1, mode);
3057
3058 diff_queue(&diff_queued_diff, one, two);
3059 options->has_changes = 1;
3060 }
3061
3062 void diff_change(struct diff_options *options,
3063 unsigned old_mode, unsigned new_mode,
3064 const unsigned char *old_sha1,
3065 const unsigned char *new_sha1,
3066 const char *base, const char *path)
3067 {
3068 char concatpath[PATH_MAX];
3069 struct diff_filespec *one, *two;
3070
3071 if (options->reverse_diff) {
3072 unsigned tmp;
3073 const unsigned char *tmp_c;
3074 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3075 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3076 }
3077 if (!path) path = "";
3078 sprintf(concatpath, "%s%s", base, path);
3079 one = alloc_filespec(concatpath);
3080 two = alloc_filespec(concatpath);
3081 fill_filespec(one, old_sha1, old_mode);
3082 fill_filespec(two, new_sha1, new_mode);
3083
3084 diff_queue(&diff_queued_diff, one, two);
3085 options->has_changes = 1;
3086 }
3087
3088 void diff_unmerge(struct diff_options *options,
3089 const char *path,
3090 unsigned mode, const unsigned char *sha1)
3091 {
3092 struct diff_filespec *one, *two;
3093 one = alloc_filespec(path);
3094 two = alloc_filespec(path);
3095 fill_filespec(one, sha1, mode);
3096 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3097 }
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