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gitweb: disambiguate heads and tags withs the same name
[git/dscho.git] / diff.c
blob08ec66c7945fb330d289f9e579a162e9217a16eb
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 #include "run-command.h"
13
14 #ifdef NO_FAST_WORKING_DIRECTORY
15 #define FAST_WORKING_DIRECTORY 0
16 #else
17 #define FAST_WORKING_DIRECTORY 1
18 #endif
19
20 static int diff_detect_rename_default;
21 static int diff_rename_limit_default = 100;
22 static int diff_use_color_default;
23 int diff_auto_refresh_index = 1;
24
25 static char diff_colors[][COLOR_MAXLEN] = {
26 "\033[m", /* reset */
27 "", /* PLAIN (normal) */
28 "\033[1m", /* METAINFO (bold) */
29 "\033[36m", /* FRAGINFO (cyan) */
30 "\033[31m", /* OLD (red) */
31 "\033[32m", /* NEW (green) */
32 "\033[33m", /* COMMIT (yellow) */
33 "\033[41m", /* WHITESPACE (red background) */
34 };
35
36 static int parse_diff_color_slot(const char *var, int ofs)
37 {
38 if (!strcasecmp(var+ofs, "plain"))
39 return DIFF_PLAIN;
40 if (!strcasecmp(var+ofs, "meta"))
41 return DIFF_METAINFO;
42 if (!strcasecmp(var+ofs, "frag"))
43 return DIFF_FRAGINFO;
44 if (!strcasecmp(var+ofs, "old"))
45 return DIFF_FILE_OLD;
46 if (!strcasecmp(var+ofs, "new"))
47 return DIFF_FILE_NEW;
48 if (!strcasecmp(var+ofs, "commit"))
49 return DIFF_COMMIT;
50 if (!strcasecmp(var+ofs, "whitespace"))
51 return DIFF_WHITESPACE;
52 die("bad config variable '%s'", var);
53 }
54
55 static struct ll_diff_driver {
56 const char *name;
57 struct ll_diff_driver *next;
58 char *cmd;
59 } *user_diff, **user_diff_tail;
60
61 static void read_config_if_needed(void)
62 {
63 if (!user_diff_tail) {
64 user_diff_tail = &user_diff;
65 git_config(git_diff_ui_config);
66 }
67 }
68
69 /*
70 * Currently there is only "diff.<drivername>.command" variable;
71 * because there are "diff.color.<slot>" variables, we are parsing
72 * this in a bit convoluted way to allow low level diff driver
73 * called "color".
74 */
75 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
76 {
77 const char *name;
78 int namelen;
79 struct ll_diff_driver *drv;
80
81 name = var + 5;
82 namelen = ep - name;
83 for (drv = user_diff; drv; drv = drv->next)
84 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
85 break;
86 if (!drv) {
87 drv = xcalloc(1, sizeof(struct ll_diff_driver));
88 drv->name = xmemdupz(name, namelen);
89 if (!user_diff_tail)
90 user_diff_tail = &user_diff;
91 *user_diff_tail = drv;
92 user_diff_tail = &(drv->next);
93 }
94
95 if (!value)
96 return error("%s: lacks value", var);
97 drv->cmd = strdup(value);
98 return 0;
99 }
100
101 /*
102 * 'diff.<what>.funcname' attribute can be specified in the configuration
103 * to define a customized regexp to find the beginning of a function to
104 * be used for hunk header lines of "diff -p" style output.
105 */
106 static struct funcname_pattern {
107 char *name;
108 char *pattern;
109 struct funcname_pattern *next;
110 } *funcname_pattern_list;
111
112 static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
113 {
114 const char *name;
115 int namelen;
116 struct funcname_pattern *pp;
117
118 name = var + 5; /* "diff." */
119 namelen = ep - name;
120
121 for (pp = funcname_pattern_list; pp; pp = pp->next)
122 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
123 break;
124 if (!pp) {
125 pp = xcalloc(1, sizeof(*pp));
126 pp->name = xmemdupz(name, namelen);
127 pp->next = funcname_pattern_list;
128 funcname_pattern_list = pp;
129 }
130 if (pp->pattern)
131 free(pp->pattern);
132 pp->pattern = xstrdup(value);
133 return 0;
134 }
135
136 /*
137 * These are to give UI layer defaults.
138 * The core-level commands such as git-diff-files should
139 * never be affected by the setting of diff.renames
140 * the user happens to have in the configuration file.
141 */
142 int git_diff_ui_config(const char *var, const char *value)
143 {
144 if (!strcmp(var, "diff.renamelimit")) {
145 diff_rename_limit_default = git_config_int(var, value);
146 return 0;
147 }
148 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
149 diff_use_color_default = git_config_colorbool(var, value, -1);
150 return 0;
151 }
152 if (!strcmp(var, "diff.renames")) {
153 if (!value)
154 diff_detect_rename_default = DIFF_DETECT_RENAME;
155 else if (!strcasecmp(value, "copies") ||
156 !strcasecmp(value, "copy"))
157 diff_detect_rename_default = DIFF_DETECT_COPY;
158 else if (git_config_bool(var,value))
159 diff_detect_rename_default = DIFF_DETECT_RENAME;
160 return 0;
161 }
162 if (!strcmp(var, "diff.autorefreshindex")) {
163 diff_auto_refresh_index = git_config_bool(var, value);
164 return 0;
165 }
166 if (!prefixcmp(var, "diff.")) {
167 const char *ep = strrchr(var, '.');
168
169 if (ep != var + 4) {
170 if (!strcmp(ep, ".command"))
171 return parse_lldiff_command(var, ep, value);
172 if (!strcmp(ep, ".funcname"))
173 return parse_funcname_pattern(var, ep, value);
174 }
175 }
176 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
177 int slot = parse_diff_color_slot(var, 11);
178 color_parse(value, var, diff_colors[slot]);
179 return 0;
180 }
181
182 return git_default_config(var, value);
183 }
184
185 static char *quote_two(const char *one, const char *two)
186 {
187 int need_one = quote_c_style(one, NULL, NULL, 1);
188 int need_two = quote_c_style(two, NULL, NULL, 1);
189 struct strbuf res;
190
191 strbuf_init(&res, 0);
192 if (need_one + need_two) {
193 strbuf_addch(&res, '"');
194 quote_c_style(one, &res, NULL, 1);
195 quote_c_style(two, &res, NULL, 1);
196 strbuf_addch(&res, '"');
197 } else {
198 strbuf_addstr(&res, one);
199 strbuf_addstr(&res, two);
200 }
201 return strbuf_detach(&res, NULL);
202 }
203
204 static const char *external_diff(void)
205 {
206 static const char *external_diff_cmd = NULL;
207 static int done_preparing = 0;
208
209 if (done_preparing)
210 return external_diff_cmd;
211 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
212 done_preparing = 1;
213 return external_diff_cmd;
214 }
215
216 static struct diff_tempfile {
217 const char *name; /* filename external diff should read from */
218 char hex[41];
219 char mode[10];
220 char tmp_path[PATH_MAX];
221 } diff_temp[2];
222
223 static int count_lines(const char *data, int size)
224 {
225 int count, ch, completely_empty = 1, nl_just_seen = 0;
226 count = 0;
227 while (0 < size--) {
228 ch = *data++;
229 if (ch == '\n') {
230 count++;
231 nl_just_seen = 1;
232 completely_empty = 0;
233 }
234 else {
235 nl_just_seen = 0;
236 completely_empty = 0;
237 }
238 }
239 if (completely_empty)
240 return 0;
241 if (!nl_just_seen)
242 count++; /* no trailing newline */
243 return count;
244 }
245
246 static void print_line_count(int count)
247 {
248 switch (count) {
249 case 0:
250 printf("0,0");
251 break;
252 case 1:
253 printf("1");
254 break;
255 default:
256 printf("1,%d", count);
257 break;
258 }
259 }
260
261 static void copy_file(int prefix, const char *data, int size,
262 const char *set, const char *reset)
263 {
264 int ch, nl_just_seen = 1;
265 while (0 < size--) {
266 ch = *data++;
267 if (nl_just_seen) {
268 fputs(set, stdout);
269 putchar(prefix);
270 }
271 if (ch == '\n') {
272 nl_just_seen = 1;
273 fputs(reset, stdout);
274 } else
275 nl_just_seen = 0;
276 putchar(ch);
277 }
278 if (!nl_just_seen)
279 printf("%s\n\\ No newline at end of file\n", reset);
280 }
281
282 static void emit_rewrite_diff(const char *name_a,
283 const char *name_b,
284 struct diff_filespec *one,
285 struct diff_filespec *two,
286 int color_diff)
287 {
288 int lc_a, lc_b;
289 const char *name_a_tab, *name_b_tab;
290 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
291 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
292 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
293 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
294 const char *reset = diff_get_color(color_diff, DIFF_RESET);
295
296 name_a += (*name_a == '/');
297 name_b += (*name_b == '/');
298 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
299 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
300
301 diff_populate_filespec(one, 0);
302 diff_populate_filespec(two, 0);
303 lc_a = count_lines(one->data, one->size);
304 lc_b = count_lines(two->data, two->size);
305 printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
306 metainfo, name_a, name_a_tab, reset,
307 metainfo, name_b, name_b_tab, reset, fraginfo);
308 print_line_count(lc_a);
309 printf(" +");
310 print_line_count(lc_b);
311 printf(" @@%s\n", reset);
312 if (lc_a)
313 copy_file('-', one->data, one->size, old, reset);
314 if (lc_b)
315 copy_file('+', two->data, two->size, new, reset);
316 }
317
318 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
319 {
320 if (!DIFF_FILE_VALID(one)) {
321 mf->ptr = (char *)""; /* does not matter */
322 mf->size = 0;
323 return 0;
324 }
325 else if (diff_populate_filespec(one, 0))
326 return -1;
327 mf->ptr = one->data;
328 mf->size = one->size;
329 return 0;
330 }
331
332 struct diff_words_buffer {
333 mmfile_t text;
334 long alloc;
335 long current; /* output pointer */
336 int suppressed_newline;
337 };
338
339 static void diff_words_append(char *line, unsigned long len,
340 struct diff_words_buffer *buffer)
341 {
342 if (buffer->text.size + len > buffer->alloc) {
343 buffer->alloc = (buffer->text.size + len) * 3 / 2;
344 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
345 }
346 line++;
347 len--;
348 memcpy(buffer->text.ptr + buffer->text.size, line, len);
349 buffer->text.size += len;
350 }
351
352 struct diff_words_data {
353 struct xdiff_emit_state xm;
354 struct diff_words_buffer minus, plus;
355 };
356
357 static void print_word(struct diff_words_buffer *buffer, int len, int color,
358 int suppress_newline)
359 {
360 const char *ptr;
361 int eol = 0;
362
363 if (len == 0)
364 return;
365
366 ptr = buffer->text.ptr + buffer->current;
367 buffer->current += len;
368
369 if (ptr[len - 1] == '\n') {
370 eol = 1;
371 len--;
372 }
373
374 fputs(diff_get_color(1, color), stdout);
375 fwrite(ptr, len, 1, stdout);
376 fputs(diff_get_color(1, DIFF_RESET), stdout);
377
378 if (eol) {
379 if (suppress_newline)
380 buffer->suppressed_newline = 1;
381 else
382 putchar('\n');
383 }
384 }
385
386 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
387 {
388 struct diff_words_data *diff_words = priv;
389
390 if (diff_words->minus.suppressed_newline) {
391 if (line[0] != '+')
392 putchar('\n');
393 diff_words->minus.suppressed_newline = 0;
394 }
395
396 len--;
397 switch (line[0]) {
398 case '-':
399 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
400 break;
401 case '+':
402 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
403 break;
404 case ' ':
405 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
406 diff_words->minus.current += len;
407 break;
408 }
409 }
410
411 /* this executes the word diff on the accumulated buffers */
412 static void diff_words_show(struct diff_words_data *diff_words)
413 {
414 xpparam_t xpp;
415 xdemitconf_t xecfg;
416 xdemitcb_t ecb;
417 mmfile_t minus, plus;
418 int i;
419
420 memset(&xecfg, 0, sizeof(xecfg));
421 minus.size = diff_words->minus.text.size;
422 minus.ptr = xmalloc(minus.size);
423 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
424 for (i = 0; i < minus.size; i++)
425 if (isspace(minus.ptr[i]))
426 minus.ptr[i] = '\n';
427 diff_words->minus.current = 0;
428
429 plus.size = diff_words->plus.text.size;
430 plus.ptr = xmalloc(plus.size);
431 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
432 for (i = 0; i < plus.size; i++)
433 if (isspace(plus.ptr[i]))
434 plus.ptr[i] = '\n';
435 diff_words->plus.current = 0;
436
437 xpp.flags = XDF_NEED_MINIMAL;
438 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
439 ecb.outf = xdiff_outf;
440 ecb.priv = diff_words;
441 diff_words->xm.consume = fn_out_diff_words_aux;
442 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
443
444 free(minus.ptr);
445 free(plus.ptr);
446 diff_words->minus.text.size = diff_words->plus.text.size = 0;
447
448 if (diff_words->minus.suppressed_newline) {
449 putchar('\n');
450 diff_words->minus.suppressed_newline = 0;
451 }
452 }
453
454 struct emit_callback {
455 struct xdiff_emit_state xm;
456 int nparents, color_diff;
457 unsigned ws_rule;
458 const char **label_path;
459 struct diff_words_data *diff_words;
460 int *found_changesp;
461 };
462
463 static void free_diff_words_data(struct emit_callback *ecbdata)
464 {
465 if (ecbdata->diff_words) {
466 /* flush buffers */
467 if (ecbdata->diff_words->minus.text.size ||
468 ecbdata->diff_words->plus.text.size)
469 diff_words_show(ecbdata->diff_words);
470
471 if (ecbdata->diff_words->minus.text.ptr)
472 free (ecbdata->diff_words->minus.text.ptr);
473 if (ecbdata->diff_words->plus.text.ptr)
474 free (ecbdata->diff_words->plus.text.ptr);
475 free(ecbdata->diff_words);
476 ecbdata->diff_words = NULL;
477 }
478 }
479
480 const char *diff_get_color(int diff_use_color, enum color_diff ix)
481 {
482 if (diff_use_color)
483 return diff_colors[ix];
484 return "";
485 }
486
487 static void emit_line(const char *set, const char *reset, const char *line, int len)
488 {
489 fputs(set, stdout);
490 fwrite(line, len, 1, stdout);
491 fputs(reset, stdout);
492 }
493
494 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
495 {
496 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
497 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
498
499 if (!*ws)
500 emit_line(set, reset, line, len);
501 else {
502 /* Emit just the prefix, then the rest. */
503 emit_line(set, reset, line, ecbdata->nparents);
504 (void)check_and_emit_line(line + ecbdata->nparents,
505 len - ecbdata->nparents, ecbdata->ws_rule,
506 stdout, set, reset, ws);
507 }
508 }
509
510 static void fn_out_consume(void *priv, char *line, unsigned long len)
511 {
512 int i;
513 int color;
514 struct emit_callback *ecbdata = priv;
515 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
516 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
517
518 *(ecbdata->found_changesp) = 1;
519
520 if (ecbdata->label_path[0]) {
521 const char *name_a_tab, *name_b_tab;
522
523 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
524 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
525
526 printf("%s--- %s%s%s\n",
527 set, ecbdata->label_path[0], reset, name_a_tab);
528 printf("%s+++ %s%s%s\n",
529 set, ecbdata->label_path[1], reset, name_b_tab);
530 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
531 }
532
533 /* This is not really necessary for now because
534 * this codepath only deals with two-way diffs.
535 */
536 for (i = 0; i < len && line[i] == '@'; i++)
537 ;
538 if (2 <= i && i < len && line[i] == ' ') {
539 ecbdata->nparents = i - 1;
540 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
541 reset, line, len);
542 return;
543 }
544
545 if (len < ecbdata->nparents) {
546 set = reset;
547 emit_line(reset, reset, line, len);
548 return;
549 }
550
551 color = DIFF_PLAIN;
552 if (ecbdata->diff_words && ecbdata->nparents != 1)
553 /* fall back to normal diff */
554 free_diff_words_data(ecbdata);
555 if (ecbdata->diff_words) {
556 if (line[0] == '-') {
557 diff_words_append(line, len,
558 &ecbdata->diff_words->minus);
559 return;
560 } else if (line[0] == '+') {
561 diff_words_append(line, len,
562 &ecbdata->diff_words->plus);
563 return;
564 }
565 if (ecbdata->diff_words->minus.text.size ||
566 ecbdata->diff_words->plus.text.size)
567 diff_words_show(ecbdata->diff_words);
568 line++;
569 len--;
570 emit_line(set, reset, line, len);
571 return;
572 }
573 for (i = 0; i < ecbdata->nparents && len; i++) {
574 if (line[i] == '-')
575 color = DIFF_FILE_OLD;
576 else if (line[i] == '+')
577 color = DIFF_FILE_NEW;
578 }
579
580 if (color != DIFF_FILE_NEW) {
581 emit_line(diff_get_color(ecbdata->color_diff, color),
582 reset, line, len);
583 return;
584 }
585 emit_add_line(reset, ecbdata, line, len);
586 }
587
588 static char *pprint_rename(const char *a, const char *b)
589 {
590 const char *old = a;
591 const char *new = b;
592 struct strbuf name;
593 int pfx_length, sfx_length;
594 int len_a = strlen(a);
595 int len_b = strlen(b);
596 int a_midlen, b_midlen;
597 int qlen_a = quote_c_style(a, NULL, NULL, 0);
598 int qlen_b = quote_c_style(b, NULL, NULL, 0);
599
600 strbuf_init(&name, 0);
601 if (qlen_a || qlen_b) {
602 quote_c_style(a, &name, NULL, 0);
603 strbuf_addstr(&name, " => ");
604 quote_c_style(b, &name, NULL, 0);
605 return strbuf_detach(&name, NULL);
606 }
607
608 /* Find common prefix */
609 pfx_length = 0;
610 while (*old && *new && *old == *new) {
611 if (*old == '/')
612 pfx_length = old - a + 1;
613 old++;
614 new++;
615 }
616
617 /* Find common suffix */
618 old = a + len_a;
619 new = b + len_b;
620 sfx_length = 0;
621 while (a <= old && b <= new && *old == *new) {
622 if (*old == '/')
623 sfx_length = len_a - (old - a);
624 old--;
625 new--;
626 }
627
628 /*
629 * pfx{mid-a => mid-b}sfx
630 * {pfx-a => pfx-b}sfx
631 * pfx{sfx-a => sfx-b}
632 * name-a => name-b
633 */
634 a_midlen = len_a - pfx_length - sfx_length;
635 b_midlen = len_b - pfx_length - sfx_length;
636 if (a_midlen < 0)
637 a_midlen = 0;
638 if (b_midlen < 0)
639 b_midlen = 0;
640
641 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
642 if (pfx_length + sfx_length) {
643 strbuf_add(&name, a, pfx_length);
644 strbuf_addch(&name, '{');
645 }
646 strbuf_add(&name, a + pfx_length, a_midlen);
647 strbuf_addstr(&name, " => ");
648 strbuf_add(&name, b + pfx_length, b_midlen);
649 if (pfx_length + sfx_length) {
650 strbuf_addch(&name, '}');
651 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
652 }
653 return strbuf_detach(&name, NULL);
654 }
655
656 struct diffstat_t {
657 struct xdiff_emit_state xm;
658
659 int nr;
660 int alloc;
661 struct diffstat_file {
662 char *from_name;
663 char *name;
664 char *print_name;
665 unsigned is_unmerged:1;
666 unsigned is_binary:1;
667 unsigned is_renamed:1;
668 unsigned int added, deleted;
669 } **files;
670 };
671
672 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
673 const char *name_a,
674 const char *name_b)
675 {
676 struct diffstat_file *x;
677 x = xcalloc(sizeof (*x), 1);
678 if (diffstat->nr == diffstat->alloc) {
679 diffstat->alloc = alloc_nr(diffstat->alloc);
680 diffstat->files = xrealloc(diffstat->files,
681 diffstat->alloc * sizeof(x));
682 }
683 diffstat->files[diffstat->nr++] = x;
684 if (name_b) {
685 x->from_name = xstrdup(name_a);
686 x->name = xstrdup(name_b);
687 x->is_renamed = 1;
688 }
689 else {
690 x->from_name = NULL;
691 x->name = xstrdup(name_a);
692 }
693 return x;
694 }
695
696 static void diffstat_consume(void *priv, char *line, unsigned long len)
697 {
698 struct diffstat_t *diffstat = priv;
699 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
700
701 if (line[0] == '+')
702 x->added++;
703 else if (line[0] == '-')
704 x->deleted++;
705 }
706
707 const char mime_boundary_leader[] = "------------";
708
709 static int scale_linear(int it, int width, int max_change)
710 {
711 /*
712 * make sure that at least one '-' is printed if there were deletions,
713 * and likewise for '+'.
714 */
715 if (max_change < 2)
716 return it;
717 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
718 }
719
720 static void show_name(const char *prefix, const char *name, int len,
721 const char *reset, const char *set)
722 {
723 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
724 }
725
726 static void show_graph(char ch, int cnt, const char *set, const char *reset)
727 {
728 if (cnt <= 0)
729 return;
730 printf("%s", set);
731 while (cnt--)
732 putchar(ch);
733 printf("%s", reset);
734 }
735
736 static void fill_print_name(struct diffstat_file *file)
737 {
738 char *pname;
739
740 if (file->print_name)
741 return;
742
743 if (!file->is_renamed) {
744 struct strbuf buf;
745 strbuf_init(&buf, 0);
746 if (quote_c_style(file->name, &buf, NULL, 0)) {
747 pname = strbuf_detach(&buf, NULL);
748 } else {
749 pname = file->name;
750 strbuf_release(&buf);
751 }
752 } else {
753 pname = pprint_rename(file->from_name, file->name);
754 }
755 file->print_name = pname;
756 }
757
758 static void show_stats(struct diffstat_t* data, struct diff_options *options)
759 {
760 int i, len, add, del, total, adds = 0, dels = 0;
761 int max_change = 0, max_len = 0;
762 int total_files = data->nr;
763 int width, name_width;
764 const char *reset, *set, *add_c, *del_c;
765
766 if (data->nr == 0)
767 return;
768
769 width = options->stat_width ? options->stat_width : 80;
770 name_width = options->stat_name_width ? options->stat_name_width : 50;
771
772 /* Sanity: give at least 5 columns to the graph,
773 * but leave at least 10 columns for the name.
774 */
775 if (width < name_width + 15) {
776 if (name_width <= 25)
777 width = name_width + 15;
778 else
779 name_width = width - 15;
780 }
781
782 /* Find the longest filename and max number of changes */
783 reset = diff_get_color_opt(options, DIFF_RESET);
784 set = diff_get_color_opt(options, DIFF_PLAIN);
785 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
786 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
787
788 for (i = 0; i < data->nr; i++) {
789 struct diffstat_file *file = data->files[i];
790 int change = file->added + file->deleted;
791 fill_print_name(file);
792 len = strlen(file->print_name);
793 if (max_len < len)
794 max_len = len;
795
796 if (file->is_binary || file->is_unmerged)
797 continue;
798 if (max_change < change)
799 max_change = change;
800 }
801
802 /* Compute the width of the graph part;
803 * 10 is for one blank at the beginning of the line plus
804 * " | count " between the name and the graph.
805 *
806 * From here on, name_width is the width of the name area,
807 * and width is the width of the graph area.
808 */
809 name_width = (name_width < max_len) ? name_width : max_len;
810 if (width < (name_width + 10) + max_change)
811 width = width - (name_width + 10);
812 else
813 width = max_change;
814
815 for (i = 0; i < data->nr; i++) {
816 const char *prefix = "";
817 char *name = data->files[i]->print_name;
818 int added = data->files[i]->added;
819 int deleted = data->files[i]->deleted;
820 int name_len;
821
822 /*
823 * "scale" the filename
824 */
825 len = name_width;
826 name_len = strlen(name);
827 if (name_width < name_len) {
828 char *slash;
829 prefix = "...";
830 len -= 3;
831 name += name_len - len;
832 slash = strchr(name, '/');
833 if (slash)
834 name = slash;
835 }
836
837 if (data->files[i]->is_binary) {
838 show_name(prefix, name, len, reset, set);
839 printf(" Bin ");
840 printf("%s%d%s", del_c, deleted, reset);
841 printf(" -> ");
842 printf("%s%d%s", add_c, added, reset);
843 printf(" bytes");
844 printf("\n");
845 continue;
846 }
847 else if (data->files[i]->is_unmerged) {
848 show_name(prefix, name, len, reset, set);
849 printf(" Unmerged\n");
850 continue;
851 }
852 else if (!data->files[i]->is_renamed &&
853 (added + deleted == 0)) {
854 total_files--;
855 continue;
856 }
857
858 /*
859 * scale the add/delete
860 */
861 add = added;
862 del = deleted;
863 total = add + del;
864 adds += add;
865 dels += del;
866
867 if (width <= max_change) {
868 add = scale_linear(add, width, max_change);
869 del = scale_linear(del, width, max_change);
870 total = add + del;
871 }
872 show_name(prefix, name, len, reset, set);
873 printf("%5d ", added + deleted);
874 show_graph('+', add, add_c, reset);
875 show_graph('-', del, del_c, reset);
876 putchar('\n');
877 }
878 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
879 set, total_files, adds, dels, reset);
880 }
881
882 static void show_shortstats(struct diffstat_t* data)
883 {
884 int i, adds = 0, dels = 0, total_files = data->nr;
885
886 if (data->nr == 0)
887 return;
888
889 for (i = 0; i < data->nr; i++) {
890 if (!data->files[i]->is_binary &&
891 !data->files[i]->is_unmerged) {
892 int added = data->files[i]->added;
893 int deleted= data->files[i]->deleted;
894 if (!data->files[i]->is_renamed &&
895 (added + deleted == 0)) {
896 total_files--;
897 } else {
898 adds += added;
899 dels += deleted;
900 }
901 }
902 }
903 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
904 total_files, adds, dels);
905 }
906
907 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
908 {
909 int i;
910
911 if (data->nr == 0)
912 return;
913
914 for (i = 0; i < data->nr; i++) {
915 struct diffstat_file *file = data->files[i];
916
917 if (file->is_binary)
918 printf("-\t-\t");
919 else
920 printf("%d\t%d\t", file->added, file->deleted);
921 if (options->line_termination) {
922 fill_print_name(file);
923 if (!file->is_renamed)
924 write_name_quoted(file->name, stdout,
925 options->line_termination);
926 else {
927 fputs(file->print_name, stdout);
928 putchar(options->line_termination);
929 }
930 } else {
931 if (file->is_renamed) {
932 putchar('\0');
933 write_name_quoted(file->from_name, stdout, '\0');
934 }
935 write_name_quoted(file->name, stdout, '\0');
936 }
937 }
938 }
939
940 static void free_diffstat_info(struct diffstat_t *diffstat)
941 {
942 int i;
943 for (i = 0; i < diffstat->nr; i++) {
944 struct diffstat_file *f = diffstat->files[i];
945 if (f->name != f->print_name)
946 free(f->print_name);
947 free(f->name);
948 free(f->from_name);
949 free(f);
950 }
951 free(diffstat->files);
952 }
953
954 struct checkdiff_t {
955 struct xdiff_emit_state xm;
956 const char *filename;
957 int lineno, color_diff;
958 unsigned ws_rule;
959 unsigned status;
960 };
961
962 static void checkdiff_consume(void *priv, char *line, unsigned long len)
963 {
964 struct checkdiff_t *data = priv;
965 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
966 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
967 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
968 char *err;
969
970 if (line[0] == '+') {
971 data->status = check_and_emit_line(line + 1, len - 1,
972 data->ws_rule, NULL, NULL, NULL, NULL);
973 if (!data->status)
974 return;
975 err = whitespace_error_string(data->status);
976 printf("%s:%d: %s.\n", data->filename, data->lineno, err);
977 free(err);
978 emit_line(set, reset, line, 1);
979 (void)check_and_emit_line(line + 1, len - 1, data->ws_rule,
980 stdout, set, reset, ws);
981 data->lineno++;
982 } else if (line[0] == ' ')
983 data->lineno++;
984 else if (line[0] == '@') {
985 char *plus = strchr(line, '+');
986 if (plus)
987 data->lineno = strtol(plus, NULL, 10);
988 else
989 die("invalid diff");
990 }
991 }
992
993 static unsigned char *deflate_it(char *data,
994 unsigned long size,
995 unsigned long *result_size)
996 {
997 int bound;
998 unsigned char *deflated;
999 z_stream stream;
1000
1001 memset(&stream, 0, sizeof(stream));
1002 deflateInit(&stream, zlib_compression_level);
1003 bound = deflateBound(&stream, size);
1004 deflated = xmalloc(bound);
1005 stream.next_out = deflated;
1006 stream.avail_out = bound;
1007
1008 stream.next_in = (unsigned char *)data;
1009 stream.avail_in = size;
1010 while (deflate(&stream, Z_FINISH) == Z_OK)
1011 ; /* nothing */
1012 deflateEnd(&stream);
1013 *result_size = stream.total_out;
1014 return deflated;
1015 }
1016
1017 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1018 {
1019 void *cp;
1020 void *delta;
1021 void *deflated;
1022 void *data;
1023 unsigned long orig_size;
1024 unsigned long delta_size;
1025 unsigned long deflate_size;
1026 unsigned long data_size;
1027
1028 /* We could do deflated delta, or we could do just deflated two,
1029 * whichever is smaller.
1030 */
1031 delta = NULL;
1032 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1033 if (one->size && two->size) {
1034 delta = diff_delta(one->ptr, one->size,
1035 two->ptr, two->size,
1036 &delta_size, deflate_size);
1037 if (delta) {
1038 void *to_free = delta;
1039 orig_size = delta_size;
1040 delta = deflate_it(delta, delta_size, &delta_size);
1041 free(to_free);
1042 }
1043 }
1044
1045 if (delta && delta_size < deflate_size) {
1046 printf("delta %lu\n", orig_size);
1047 free(deflated);
1048 data = delta;
1049 data_size = delta_size;
1050 }
1051 else {
1052 printf("literal %lu\n", two->size);
1053 free(delta);
1054 data = deflated;
1055 data_size = deflate_size;
1056 }
1057
1058 /* emit data encoded in base85 */
1059 cp = data;
1060 while (data_size) {
1061 int bytes = (52 < data_size) ? 52 : data_size;
1062 char line[70];
1063 data_size -= bytes;
1064 if (bytes <= 26)
1065 line[0] = bytes + 'A' - 1;
1066 else
1067 line[0] = bytes - 26 + 'a' - 1;
1068 encode_85(line + 1, cp, bytes);
1069 cp = (char *) cp + bytes;
1070 puts(line);
1071 }
1072 printf("\n");
1073 free(data);
1074 }
1075
1076 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1077 {
1078 printf("GIT binary patch\n");
1079 emit_binary_diff_body(one, two);
1080 emit_binary_diff_body(two, one);
1081 }
1082
1083 static void setup_diff_attr_check(struct git_attr_check *check)
1084 {
1085 static struct git_attr *attr_diff;
1086
1087 if (!attr_diff) {
1088 attr_diff = git_attr("diff", 4);
1089 }
1090 check[0].attr = attr_diff;
1091 }
1092
1093 static void diff_filespec_check_attr(struct diff_filespec *one)
1094 {
1095 struct git_attr_check attr_diff_check;
1096 int check_from_data = 0;
1097
1098 if (one->checked_attr)
1099 return;
1100
1101 setup_diff_attr_check(&attr_diff_check);
1102 one->is_binary = 0;
1103 one->funcname_pattern_ident = NULL;
1104
1105 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1106 const char *value;
1107
1108 /* binaryness */
1109 value = attr_diff_check.value;
1110 if (ATTR_TRUE(value))
1111 ;
1112 else if (ATTR_FALSE(value))
1113 one->is_binary = 1;
1114 else
1115 check_from_data = 1;
1116
1117 /* funcname pattern ident */
1118 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1119 ;
1120 else
1121 one->funcname_pattern_ident = value;
1122 }
1123
1124 if (check_from_data) {
1125 if (!one->data && DIFF_FILE_VALID(one))
1126 diff_populate_filespec(one, 0);
1127
1128 if (one->data)
1129 one->is_binary = buffer_is_binary(one->data, one->size);
1130 }
1131 }
1132
1133 int diff_filespec_is_binary(struct diff_filespec *one)
1134 {
1135 diff_filespec_check_attr(one);
1136 return one->is_binary;
1137 }
1138
1139 static const char *funcname_pattern(const char *ident)
1140 {
1141 struct funcname_pattern *pp;
1142
1143 read_config_if_needed();
1144 for (pp = funcname_pattern_list; pp; pp = pp->next)
1145 if (!strcmp(ident, pp->name))
1146 return pp->pattern;
1147 return NULL;
1148 }
1149
1150 static struct builtin_funcname_pattern {
1151 const char *name;
1152 const char *pattern;
1153 } builtin_funcname_pattern[] = {
1154 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1155 "new\\|return\\|switch\\|throw\\|while\\)\n"
1156 "^[ ]*\\(\\([ ]*"
1157 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1158 "[ ]*([^;]*$\\)" },
1159 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1160 };
1161
1162 static const char *diff_funcname_pattern(struct diff_filespec *one)
1163 {
1164 const char *ident, *pattern;
1165 int i;
1166
1167 diff_filespec_check_attr(one);
1168 ident = one->funcname_pattern_ident;
1169
1170 if (!ident)
1171 /*
1172 * If the config file has "funcname.default" defined, that
1173 * regexp is used; otherwise NULL is returned and xemit uses
1174 * the built-in default.
1175 */
1176 return funcname_pattern("default");
1177
1178 /* Look up custom "funcname.$ident" regexp from config. */
1179 pattern = funcname_pattern(ident);
1180 if (pattern)
1181 return pattern;
1182
1183 /*
1184 * And define built-in fallback patterns here. Note that
1185 * these can be overriden by the user's config settings.
1186 */
1187 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1188 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1189 return builtin_funcname_pattern[i].pattern;
1190
1191 return NULL;
1192 }
1193
1194 static void builtin_diff(const char *name_a,
1195 const char *name_b,
1196 struct diff_filespec *one,
1197 struct diff_filespec *two,
1198 const char *xfrm_msg,
1199 struct diff_options *o,
1200 int complete_rewrite)
1201 {
1202 mmfile_t mf1, mf2;
1203 const char *lbl[2];
1204 char *a_one, *b_two;
1205 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1206 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1207
1208 a_one = quote_two("a/", name_a + (*name_a == '/'));
1209 b_two = quote_two("b/", name_b + (*name_b == '/'));
1210 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1211 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1212 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1213 if (lbl[0][0] == '/') {
1214 /* /dev/null */
1215 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1216 if (xfrm_msg && xfrm_msg[0])
1217 printf("%s%s%s\n", set, xfrm_msg, reset);
1218 }
1219 else if (lbl[1][0] == '/') {
1220 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1221 if (xfrm_msg && xfrm_msg[0])
1222 printf("%s%s%s\n", set, xfrm_msg, reset);
1223 }
1224 else {
1225 if (one->mode != two->mode) {
1226 printf("%sold mode %06o%s\n", set, one->mode, reset);
1227 printf("%snew mode %06o%s\n", set, two->mode, reset);
1228 }
1229 if (xfrm_msg && xfrm_msg[0])
1230 printf("%s%s%s\n", set, xfrm_msg, reset);
1231 /*
1232 * we do not run diff between different kind
1233 * of objects.
1234 */
1235 if ((one->mode ^ two->mode) & S_IFMT)
1236 goto free_ab_and_return;
1237 if (complete_rewrite) {
1238 emit_rewrite_diff(name_a, name_b, one, two,
1239 DIFF_OPT_TST(o, COLOR_DIFF));
1240 o->found_changes = 1;
1241 goto free_ab_and_return;
1242 }
1243 }
1244
1245 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1246 die("unable to read files to diff");
1247
1248 if (!DIFF_OPT_TST(o, TEXT) &&
1249 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1250 /* Quite common confusing case */
1251 if (mf1.size == mf2.size &&
1252 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1253 goto free_ab_and_return;
1254 if (DIFF_OPT_TST(o, BINARY))
1255 emit_binary_diff(&mf1, &mf2);
1256 else
1257 printf("Binary files %s and %s differ\n",
1258 lbl[0], lbl[1]);
1259 o->found_changes = 1;
1260 }
1261 else {
1262 /* Crazy xdl interfaces.. */
1263 const char *diffopts = getenv("GIT_DIFF_OPTS");
1264 xpparam_t xpp;
1265 xdemitconf_t xecfg;
1266 xdemitcb_t ecb;
1267 struct emit_callback ecbdata;
1268 const char *funcname_pattern;
1269
1270 funcname_pattern = diff_funcname_pattern(one);
1271 if (!funcname_pattern)
1272 funcname_pattern = diff_funcname_pattern(two);
1273
1274 memset(&xecfg, 0, sizeof(xecfg));
1275 memset(&ecbdata, 0, sizeof(ecbdata));
1276 ecbdata.label_path = lbl;
1277 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1278 ecbdata.found_changesp = &o->found_changes;
1279 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1280 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1281 xecfg.ctxlen = o->context;
1282 xecfg.flags = XDL_EMIT_FUNCNAMES;
1283 if (funcname_pattern)
1284 xdiff_set_find_func(&xecfg, funcname_pattern);
1285 if (!diffopts)
1286 ;
1287 else if (!prefixcmp(diffopts, "--unified="))
1288 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1289 else if (!prefixcmp(diffopts, "-u"))
1290 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1291 ecb.outf = xdiff_outf;
1292 ecb.priv = &ecbdata;
1293 ecbdata.xm.consume = fn_out_consume;
1294 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1295 ecbdata.diff_words =
1296 xcalloc(1, sizeof(struct diff_words_data));
1297 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1298 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1299 free_diff_words_data(&ecbdata);
1300 }
1301
1302 free_ab_and_return:
1303 diff_free_filespec_data(one);
1304 diff_free_filespec_data(two);
1305 free(a_one);
1306 free(b_two);
1307 return;
1308 }
1309
1310 static void builtin_diffstat(const char *name_a, const char *name_b,
1311 struct diff_filespec *one,
1312 struct diff_filespec *two,
1313 struct diffstat_t *diffstat,
1314 struct diff_options *o,
1315 int complete_rewrite)
1316 {
1317 mmfile_t mf1, mf2;
1318 struct diffstat_file *data;
1319
1320 data = diffstat_add(diffstat, name_a, name_b);
1321
1322 if (!one || !two) {
1323 data->is_unmerged = 1;
1324 return;
1325 }
1326 if (complete_rewrite) {
1327 diff_populate_filespec(one, 0);
1328 diff_populate_filespec(two, 0);
1329 data->deleted = count_lines(one->data, one->size);
1330 data->added = count_lines(two->data, two->size);
1331 goto free_and_return;
1332 }
1333 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1334 die("unable to read files to diff");
1335
1336 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1337 data->is_binary = 1;
1338 data->added = mf2.size;
1339 data->deleted = mf1.size;
1340 } else {
1341 /* Crazy xdl interfaces.. */
1342 xpparam_t xpp;
1343 xdemitconf_t xecfg;
1344 xdemitcb_t ecb;
1345
1346 memset(&xecfg, 0, sizeof(xecfg));
1347 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1348 ecb.outf = xdiff_outf;
1349 ecb.priv = diffstat;
1350 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1351 }
1352
1353 free_and_return:
1354 diff_free_filespec_data(one);
1355 diff_free_filespec_data(two);
1356 }
1357
1358 static void builtin_checkdiff(const char *name_a, const char *name_b,
1359 struct diff_filespec *one,
1360 struct diff_filespec *two, struct diff_options *o)
1361 {
1362 mmfile_t mf1, mf2;
1363 struct checkdiff_t data;
1364
1365 if (!two)
1366 return;
1367
1368 memset(&data, 0, sizeof(data));
1369 data.xm.consume = checkdiff_consume;
1370 data.filename = name_b ? name_b : name_a;
1371 data.lineno = 0;
1372 data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1373 data.ws_rule = whitespace_rule(data.filename);
1374
1375 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1376 die("unable to read files to diff");
1377
1378 if (diff_filespec_is_binary(two))
1379 goto free_and_return;
1380 else {
1381 /* Crazy xdl interfaces.. */
1382 xpparam_t xpp;
1383 xdemitconf_t xecfg;
1384 xdemitcb_t ecb;
1385
1386 memset(&xecfg, 0, sizeof(xecfg));
1387 xpp.flags = XDF_NEED_MINIMAL;
1388 ecb.outf = xdiff_outf;
1389 ecb.priv = &data;
1390 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1391 }
1392 free_and_return:
1393 diff_free_filespec_data(one);
1394 diff_free_filespec_data(two);
1395 if (data.status)
1396 DIFF_OPT_SET(o, CHECK_FAILED);
1397 }
1398
1399 struct diff_filespec *alloc_filespec(const char *path)
1400 {
1401 int namelen = strlen(path);
1402 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1403
1404 memset(spec, 0, sizeof(*spec));
1405 spec->path = (char *)(spec + 1);
1406 memcpy(spec->path, path, namelen+1);
1407 spec->count = 1;
1408 return spec;
1409 }
1410
1411 void free_filespec(struct diff_filespec *spec)
1412 {
1413 if (!--spec->count) {
1414 diff_free_filespec_data(spec);
1415 free(spec);
1416 }
1417 }
1418
1419 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1420 unsigned short mode)
1421 {
1422 if (mode) {
1423 spec->mode = canon_mode(mode);
1424 hashcpy(spec->sha1, sha1);
1425 spec->sha1_valid = !is_null_sha1(sha1);
1426 }
1427 }
1428
1429 /*
1430 * Given a name and sha1 pair, if the index tells us the file in
1431 * the work tree has that object contents, return true, so that
1432 * prepare_temp_file() does not have to inflate and extract.
1433 */
1434 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1435 {
1436 struct cache_entry *ce;
1437 struct stat st;
1438 int pos, len;
1439
1440 /* We do not read the cache ourselves here, because the
1441 * benchmark with my previous version that always reads cache
1442 * shows that it makes things worse for diff-tree comparing
1443 * two linux-2.6 kernel trees in an already checked out work
1444 * tree. This is because most diff-tree comparisons deal with
1445 * only a small number of files, while reading the cache is
1446 * expensive for a large project, and its cost outweighs the
1447 * savings we get by not inflating the object to a temporary
1448 * file. Practically, this code only helps when we are used
1449 * by diff-cache --cached, which does read the cache before
1450 * calling us.
1451 */
1452 if (!active_cache)
1453 return 0;
1454
1455 /* We want to avoid the working directory if our caller
1456 * doesn't need the data in a normal file, this system
1457 * is rather slow with its stat/open/mmap/close syscalls,
1458 * and the object is contained in a pack file. The pack
1459 * is probably already open and will be faster to obtain
1460 * the data through than the working directory. Loose
1461 * objects however would tend to be slower as they need
1462 * to be individually opened and inflated.
1463 */
1464 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1465 return 0;
1466
1467 len = strlen(name);
1468 pos = cache_name_pos(name, len);
1469 if (pos < 0)
1470 return 0;
1471 ce = active_cache[pos];
1472 if ((lstat(name, &st) < 0) ||
1473 !S_ISREG(st.st_mode) || /* careful! */
1474 ce_match_stat(ce, &st, 0) ||
1475 hashcmp(sha1, ce->sha1))
1476 return 0;
1477 /* we return 1 only when we can stat, it is a regular file,
1478 * stat information matches, and sha1 recorded in the cache
1479 * matches. I.e. we know the file in the work tree really is
1480 * the same as the <name, sha1> pair.
1481 */
1482 return 1;
1483 }
1484
1485 static int populate_from_stdin(struct diff_filespec *s)
1486 {
1487 struct strbuf buf;
1488 size_t size = 0;
1489
1490 strbuf_init(&buf, 0);
1491 if (strbuf_read(&buf, 0, 0) < 0)
1492 return error("error while reading from stdin %s",
1493 strerror(errno));
1494
1495 s->should_munmap = 0;
1496 s->data = strbuf_detach(&buf, &size);
1497 s->size = size;
1498 s->should_free = 1;
1499 return 0;
1500 }
1501
1502 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1503 {
1504 int len;
1505 char *data = xmalloc(100);
1506 len = snprintf(data, 100,
1507 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1508 s->data = data;
1509 s->size = len;
1510 s->should_free = 1;
1511 if (size_only) {
1512 s->data = NULL;
1513 free(data);
1514 }
1515 return 0;
1516 }
1517
1518 /*
1519 * While doing rename detection and pickaxe operation, we may need to
1520 * grab the data for the blob (or file) for our own in-core comparison.
1521 * diff_filespec has data and size fields for this purpose.
1522 */
1523 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1524 {
1525 int err = 0;
1526 if (!DIFF_FILE_VALID(s))
1527 die("internal error: asking to populate invalid file.");
1528 if (S_ISDIR(s->mode))
1529 return -1;
1530
1531 if (s->data)
1532 return 0;
1533
1534 if (size_only && 0 < s->size)
1535 return 0;
1536
1537 if (S_ISGITLINK(s->mode))
1538 return diff_populate_gitlink(s, size_only);
1539
1540 if (!s->sha1_valid ||
1541 reuse_worktree_file(s->path, s->sha1, 0)) {
1542 struct strbuf buf;
1543 struct stat st;
1544 int fd;
1545
1546 if (!strcmp(s->path, "-"))
1547 return populate_from_stdin(s);
1548
1549 if (lstat(s->path, &st) < 0) {
1550 if (errno == ENOENT) {
1551 err_empty:
1552 err = -1;
1553 empty:
1554 s->data = (char *)"";
1555 s->size = 0;
1556 return err;
1557 }
1558 }
1559 s->size = xsize_t(st.st_size);
1560 if (!s->size)
1561 goto empty;
1562 if (size_only)
1563 return 0;
1564 if (S_ISLNK(st.st_mode)) {
1565 int ret;
1566 s->data = xmalloc(s->size);
1567 s->should_free = 1;
1568 ret = readlink(s->path, s->data, s->size);
1569 if (ret < 0) {
1570 free(s->data);
1571 goto err_empty;
1572 }
1573 return 0;
1574 }
1575 fd = open(s->path, O_RDONLY);
1576 if (fd < 0)
1577 goto err_empty;
1578 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1579 close(fd);
1580 s->should_munmap = 1;
1581
1582 /*
1583 * Convert from working tree format to canonical git format
1584 */
1585 strbuf_init(&buf, 0);
1586 if (convert_to_git(s->path, s->data, s->size, &buf)) {
1587 size_t size = 0;
1588 munmap(s->data, s->size);
1589 s->should_munmap = 0;
1590 s->data = strbuf_detach(&buf, &size);
1591 s->size = size;
1592 s->should_free = 1;
1593 }
1594 }
1595 else {
1596 enum object_type type;
1597 if (size_only)
1598 type = sha1_object_info(s->sha1, &s->size);
1599 else {
1600 s->data = read_sha1_file(s->sha1, &type, &s->size);
1601 s->should_free = 1;
1602 }
1603 }
1604 return 0;
1605 }
1606
1607 void diff_free_filespec_blob(struct diff_filespec *s)
1608 {
1609 if (s->should_free)
1610 free(s->data);
1611 else if (s->should_munmap)
1612 munmap(s->data, s->size);
1613
1614 if (s->should_free || s->should_munmap) {
1615 s->should_free = s->should_munmap = 0;
1616 s->data = NULL;
1617 }
1618 }
1619
1620 void diff_free_filespec_data(struct diff_filespec *s)
1621 {
1622 diff_free_filespec_blob(s);
1623 free(s->cnt_data);
1624 s->cnt_data = NULL;
1625 }
1626
1627 static void prep_temp_blob(struct diff_tempfile *temp,
1628 void *blob,
1629 unsigned long size,
1630 const unsigned char *sha1,
1631 int mode)
1632 {
1633 int fd;
1634
1635 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1636 if (fd < 0)
1637 die("unable to create temp-file: %s", strerror(errno));
1638 if (write_in_full(fd, blob, size) != size)
1639 die("unable to write temp-file");
1640 close(fd);
1641 temp->name = temp->tmp_path;
1642 strcpy(temp->hex, sha1_to_hex(sha1));
1643 temp->hex[40] = 0;
1644 sprintf(temp->mode, "%06o", mode);
1645 }
1646
1647 static void prepare_temp_file(const char *name,
1648 struct diff_tempfile *temp,
1649 struct diff_filespec *one)
1650 {
1651 if (!DIFF_FILE_VALID(one)) {
1652 not_a_valid_file:
1653 /* A '-' entry produces this for file-2, and
1654 * a '+' entry produces this for file-1.
1655 */
1656 temp->name = "/dev/null";
1657 strcpy(temp->hex, ".");
1658 strcpy(temp->mode, ".");
1659 return;
1660 }
1661
1662 if (!one->sha1_valid ||
1663 reuse_worktree_file(name, one->sha1, 1)) {
1664 struct stat st;
1665 if (lstat(name, &st) < 0) {
1666 if (errno == ENOENT)
1667 goto not_a_valid_file;
1668 die("stat(%s): %s", name, strerror(errno));
1669 }
1670 if (S_ISLNK(st.st_mode)) {
1671 int ret;
1672 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1673 size_t sz = xsize_t(st.st_size);
1674 if (sizeof(buf) <= st.st_size)
1675 die("symlink too long: %s", name);
1676 ret = readlink(name, buf, sz);
1677 if (ret < 0)
1678 die("readlink(%s)", name);
1679 prep_temp_blob(temp, buf, sz,
1680 (one->sha1_valid ?
1681 one->sha1 : null_sha1),
1682 (one->sha1_valid ?
1683 one->mode : S_IFLNK));
1684 }
1685 else {
1686 /* we can borrow from the file in the work tree */
1687 temp->name = name;
1688 if (!one->sha1_valid)
1689 strcpy(temp->hex, sha1_to_hex(null_sha1));
1690 else
1691 strcpy(temp->hex, sha1_to_hex(one->sha1));
1692 /* Even though we may sometimes borrow the
1693 * contents from the work tree, we always want
1694 * one->mode. mode is trustworthy even when
1695 * !(one->sha1_valid), as long as
1696 * DIFF_FILE_VALID(one).
1697 */
1698 sprintf(temp->mode, "%06o", one->mode);
1699 }
1700 return;
1701 }
1702 else {
1703 if (diff_populate_filespec(one, 0))
1704 die("cannot read data blob for %s", one->path);
1705 prep_temp_blob(temp, one->data, one->size,
1706 one->sha1, one->mode);
1707 }
1708 }
1709
1710 static void remove_tempfile(void)
1711 {
1712 int i;
1713
1714 for (i = 0; i < 2; i++)
1715 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1716 unlink(diff_temp[i].name);
1717 diff_temp[i].name = NULL;
1718 }
1719 }
1720
1721 static void remove_tempfile_on_signal(int signo)
1722 {
1723 remove_tempfile();
1724 signal(SIGINT, SIG_DFL);
1725 raise(signo);
1726 }
1727
1728 /* An external diff command takes:
1729 *
1730 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1731 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1732 *
1733 */
1734 static void run_external_diff(const char *pgm,
1735 const char *name,
1736 const char *other,
1737 struct diff_filespec *one,
1738 struct diff_filespec *two,
1739 const char *xfrm_msg,
1740 int complete_rewrite)
1741 {
1742 const char *spawn_arg[10];
1743 struct diff_tempfile *temp = diff_temp;
1744 int retval;
1745 static int atexit_asked = 0;
1746 const char *othername;
1747 const char **arg = &spawn_arg[0];
1748
1749 othername = (other? other : name);
1750 if (one && two) {
1751 prepare_temp_file(name, &temp[0], one);
1752 prepare_temp_file(othername, &temp[1], two);
1753 if (! atexit_asked &&
1754 (temp[0].name == temp[0].tmp_path ||
1755 temp[1].name == temp[1].tmp_path)) {
1756 atexit_asked = 1;
1757 atexit(remove_tempfile);
1758 }
1759 signal(SIGINT, remove_tempfile_on_signal);
1760 }
1761
1762 if (one && two) {
1763 *arg++ = pgm;
1764 *arg++ = name;
1765 *arg++ = temp[0].name;
1766 *arg++ = temp[0].hex;
1767 *arg++ = temp[0].mode;
1768 *arg++ = temp[1].name;
1769 *arg++ = temp[1].hex;
1770 *arg++ = temp[1].mode;
1771 if (other) {
1772 *arg++ = other;
1773 *arg++ = xfrm_msg;
1774 }
1775 } else {
1776 *arg++ = pgm;
1777 *arg++ = name;
1778 }
1779 *arg = NULL;
1780 fflush(NULL);
1781 retval = run_command_v_opt(spawn_arg, 0);
1782 remove_tempfile();
1783 if (retval) {
1784 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1785 exit(1);
1786 }
1787 }
1788
1789 static const char *external_diff_attr(const char *name)
1790 {
1791 struct git_attr_check attr_diff_check;
1792
1793 setup_diff_attr_check(&attr_diff_check);
1794 if (!git_checkattr(name, 1, &attr_diff_check)) {
1795 const char *value = attr_diff_check.value;
1796 if (!ATTR_TRUE(value) &&
1797 !ATTR_FALSE(value) &&
1798 !ATTR_UNSET(value)) {
1799 struct ll_diff_driver *drv;
1800
1801 read_config_if_needed();
1802 for (drv = user_diff; drv; drv = drv->next)
1803 if (!strcmp(drv->name, value))
1804 return drv->cmd;
1805 }
1806 }
1807 return NULL;
1808 }
1809
1810 static void run_diff_cmd(const char *pgm,
1811 const char *name,
1812 const char *other,
1813 struct diff_filespec *one,
1814 struct diff_filespec *two,
1815 const char *xfrm_msg,
1816 struct diff_options *o,
1817 int complete_rewrite)
1818 {
1819 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
1820 pgm = NULL;
1821 else {
1822 const char *cmd = external_diff_attr(name);
1823 if (cmd)
1824 pgm = cmd;
1825 }
1826
1827 if (pgm) {
1828 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1829 complete_rewrite);
1830 return;
1831 }
1832 if (one && two)
1833 builtin_diff(name, other ? other : name,
1834 one, two, xfrm_msg, o, complete_rewrite);
1835 else
1836 printf("* Unmerged path %s\n", name);
1837 }
1838
1839 static void diff_fill_sha1_info(struct diff_filespec *one)
1840 {
1841 if (DIFF_FILE_VALID(one)) {
1842 if (!one->sha1_valid) {
1843 struct stat st;
1844 if (!strcmp(one->path, "-")) {
1845 hashcpy(one->sha1, null_sha1);
1846 return;
1847 }
1848 if (lstat(one->path, &st) < 0)
1849 die("stat %s", one->path);
1850 if (index_path(one->sha1, one->path, &st, 0))
1851 die("cannot hash %s\n", one->path);
1852 }
1853 }
1854 else
1855 hashclr(one->sha1);
1856 }
1857
1858 static int similarity_index(struct diff_filepair *p)
1859 {
1860 return p->score * 100 / MAX_SCORE;
1861 }
1862
1863 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1864 {
1865 const char *pgm = external_diff();
1866 struct strbuf msg;
1867 char *xfrm_msg;
1868 struct diff_filespec *one = p->one;
1869 struct diff_filespec *two = p->two;
1870 const char *name;
1871 const char *other;
1872 int complete_rewrite = 0;
1873
1874
1875 if (DIFF_PAIR_UNMERGED(p)) {
1876 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1877 return;
1878 }
1879
1880 name = p->one->path;
1881 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1882 diff_fill_sha1_info(one);
1883 diff_fill_sha1_info(two);
1884
1885 strbuf_init(&msg, PATH_MAX * 2 + 300);
1886 switch (p->status) {
1887 case DIFF_STATUS_COPIED:
1888 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1889 strbuf_addstr(&msg, "\ncopy from ");
1890 quote_c_style(name, &msg, NULL, 0);
1891 strbuf_addstr(&msg, "\ncopy to ");
1892 quote_c_style(other, &msg, NULL, 0);
1893 strbuf_addch(&msg, '\n');
1894 break;
1895 case DIFF_STATUS_RENAMED:
1896 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1897 strbuf_addstr(&msg, "\nrename from ");
1898 quote_c_style(name, &msg, NULL, 0);
1899 strbuf_addstr(&msg, "\nrename to ");
1900 quote_c_style(other, &msg, NULL, 0);
1901 strbuf_addch(&msg, '\n');
1902 break;
1903 case DIFF_STATUS_MODIFIED:
1904 if (p->score) {
1905 strbuf_addf(&msg, "dissimilarity index %d%%\n",
1906 similarity_index(p));
1907 complete_rewrite = 1;
1908 break;
1909 }
1910 /* fallthru */
1911 default:
1912 /* nothing */
1913 ;
1914 }
1915
1916 if (hashcmp(one->sha1, two->sha1)) {
1917 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
1918
1919 if (DIFF_OPT_TST(o, BINARY)) {
1920 mmfile_t mf;
1921 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
1922 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
1923 abbrev = 40;
1924 }
1925 strbuf_addf(&msg, "index %.*s..%.*s",
1926 abbrev, sha1_to_hex(one->sha1),
1927 abbrev, sha1_to_hex(two->sha1));
1928 if (one->mode == two->mode)
1929 strbuf_addf(&msg, " %06o", one->mode);
1930 strbuf_addch(&msg, '\n');
1931 }
1932
1933 if (msg.len)
1934 strbuf_setlen(&msg, msg.len - 1);
1935 xfrm_msg = msg.len ? msg.buf : NULL;
1936
1937 if (!pgm &&
1938 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1939 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1940 /* a filepair that changes between file and symlink
1941 * needs to be split into deletion and creation.
1942 */
1943 struct diff_filespec *null = alloc_filespec(two->path);
1944 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1945 free(null);
1946 null = alloc_filespec(one->path);
1947 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1948 free(null);
1949 }
1950 else
1951 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1952 complete_rewrite);
1953
1954 strbuf_release(&msg);
1955 }
1956
1957 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1958 struct diffstat_t *diffstat)
1959 {
1960 const char *name;
1961 const char *other;
1962 int complete_rewrite = 0;
1963
1964 if (DIFF_PAIR_UNMERGED(p)) {
1965 /* unmerged */
1966 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1967 return;
1968 }
1969
1970 name = p->one->path;
1971 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1972
1973 diff_fill_sha1_info(p->one);
1974 diff_fill_sha1_info(p->two);
1975
1976 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1977 complete_rewrite = 1;
1978 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
1979 }
1980
1981 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1982 {
1983 const char *name;
1984 const char *other;
1985
1986 if (DIFF_PAIR_UNMERGED(p)) {
1987 /* unmerged */
1988 return;
1989 }
1990
1991 name = p->one->path;
1992 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1993
1994 diff_fill_sha1_info(p->one);
1995 diff_fill_sha1_info(p->two);
1996
1997 builtin_checkdiff(name, other, p->one, p->two, o);
1998 }
1999
2000 void diff_setup(struct diff_options *options)
2001 {
2002 memset(options, 0, sizeof(*options));
2003 options->line_termination = '\n';
2004 options->break_opt = -1;
2005 options->rename_limit = -1;
2006 options->context = 3;
2007 options->msg_sep = "";
2008
2009 options->change = diff_change;
2010 options->add_remove = diff_addremove;
2011 if (diff_use_color_default)
2012 DIFF_OPT_SET(options, COLOR_DIFF);
2013 else
2014 DIFF_OPT_CLR(options, COLOR_DIFF);
2015 options->detect_rename = diff_detect_rename_default;
2016 }
2017
2018 int diff_setup_done(struct diff_options *options)
2019 {
2020 int count = 0;
2021
2022 if (options->output_format & DIFF_FORMAT_NAME)
2023 count++;
2024 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2025 count++;
2026 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2027 count++;
2028 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2029 count++;
2030 if (count > 1)
2031 die("--name-only, --name-status, --check and -s are mutually exclusive");
2032
2033 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2034 options->detect_rename = DIFF_DETECT_COPY;
2035
2036 if (options->output_format & (DIFF_FORMAT_NAME |
2037 DIFF_FORMAT_NAME_STATUS |
2038 DIFF_FORMAT_CHECKDIFF |
2039 DIFF_FORMAT_NO_OUTPUT))
2040 options->output_format &= ~(DIFF_FORMAT_RAW |
2041 DIFF_FORMAT_NUMSTAT |
2042 DIFF_FORMAT_DIFFSTAT |
2043 DIFF_FORMAT_SHORTSTAT |
2044 DIFF_FORMAT_SUMMARY |
2045 DIFF_FORMAT_PATCH);
2046
2047 /*
2048 * These cases always need recursive; we do not drop caller-supplied
2049 * recursive bits for other formats here.
2050 */
2051 if (options->output_format & (DIFF_FORMAT_PATCH |
2052 DIFF_FORMAT_NUMSTAT |
2053 DIFF_FORMAT_DIFFSTAT |
2054 DIFF_FORMAT_SHORTSTAT |
2055 DIFF_FORMAT_SUMMARY |
2056 DIFF_FORMAT_CHECKDIFF))
2057 DIFF_OPT_SET(options, RECURSIVE);
2058 /*
2059 * Also pickaxe would not work very well if you do not say recursive
2060 */
2061 if (options->pickaxe)
2062 DIFF_OPT_SET(options, RECURSIVE);
2063
2064 if (options->detect_rename && options->rename_limit < 0)
2065 options->rename_limit = diff_rename_limit_default;
2066 if (options->setup & DIFF_SETUP_USE_CACHE) {
2067 if (!active_cache)
2068 /* read-cache does not die even when it fails
2069 * so it is safe for us to do this here. Also
2070 * it does not smudge active_cache or active_nr
2071 * when it fails, so we do not have to worry about
2072 * cleaning it up ourselves either.
2073 */
2074 read_cache();
2075 }
2076 if (options->abbrev <= 0 || 40 < options->abbrev)
2077 options->abbrev = 40; /* full */
2078
2079 /*
2080 * It does not make sense to show the first hit we happened
2081 * to have found. It does not make sense not to return with
2082 * exit code in such a case either.
2083 */
2084 if (DIFF_OPT_TST(options, QUIET)) {
2085 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2086 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2087 }
2088
2089 /*
2090 * If we postprocess in diffcore, we cannot simply return
2091 * upon the first hit. We need to run diff as usual.
2092 */
2093 if (options->pickaxe || options->filter)
2094 DIFF_OPT_CLR(options, QUIET);
2095
2096 return 0;
2097 }
2098
2099 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2100 {
2101 char c, *eq;
2102 int len;
2103
2104 if (*arg != '-')
2105 return 0;
2106 c = *++arg;
2107 if (!c)
2108 return 0;
2109 if (c == arg_short) {
2110 c = *++arg;
2111 if (!c)
2112 return 1;
2113 if (val && isdigit(c)) {
2114 char *end;
2115 int n = strtoul(arg, &end, 10);
2116 if (*end)
2117 return 0;
2118 *val = n;
2119 return 1;
2120 }
2121 return 0;
2122 }
2123 if (c != '-')
2124 return 0;
2125 arg++;
2126 eq = strchr(arg, '=');
2127 if (eq)
2128 len = eq - arg;
2129 else
2130 len = strlen(arg);
2131 if (!len || strncmp(arg, arg_long, len))
2132 return 0;
2133 if (eq) {
2134 int n;
2135 char *end;
2136 if (!isdigit(*++eq))
2137 return 0;
2138 n = strtoul(eq, &end, 10);
2139 if (*end)
2140 return 0;
2141 *val = n;
2142 }
2143 return 1;
2144 }
2145
2146 static int diff_scoreopt_parse(const char *opt);
2147
2148 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2149 {
2150 const char *arg = av[0];
2151
2152 /* Output format options */
2153 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2154 options->output_format |= DIFF_FORMAT_PATCH;
2155 else if (opt_arg(arg, 'U', "unified", &options->context))
2156 options->output_format |= DIFF_FORMAT_PATCH;
2157 else if (!strcmp(arg, "--raw"))
2158 options->output_format |= DIFF_FORMAT_RAW;
2159 else if (!strcmp(arg, "--patch-with-raw"))
2160 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2161 else if (!strcmp(arg, "--numstat"))
2162 options->output_format |= DIFF_FORMAT_NUMSTAT;
2163 else if (!strcmp(arg, "--shortstat"))
2164 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2165 else if (!strcmp(arg, "--check"))
2166 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2167 else if (!strcmp(arg, "--summary"))
2168 options->output_format |= DIFF_FORMAT_SUMMARY;
2169 else if (!strcmp(arg, "--patch-with-stat"))
2170 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2171 else if (!strcmp(arg, "--name-only"))
2172 options->output_format |= DIFF_FORMAT_NAME;
2173 else if (!strcmp(arg, "--name-status"))
2174 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2175 else if (!strcmp(arg, "-s"))
2176 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2177 else if (!prefixcmp(arg, "--stat")) {
2178 char *end;
2179 int width = options->stat_width;
2180 int name_width = options->stat_name_width;
2181 arg += 6;
2182 end = (char *)arg;
2183
2184 switch (*arg) {
2185 case '-':
2186 if (!prefixcmp(arg, "-width="))
2187 width = strtoul(arg + 7, &end, 10);
2188 else if (!prefixcmp(arg, "-name-width="))
2189 name_width = strtoul(arg + 12, &end, 10);
2190 break;
2191 case '=':
2192 width = strtoul(arg+1, &end, 10);
2193 if (*end == ',')
2194 name_width = strtoul(end+1, &end, 10);
2195 }
2196
2197 /* Important! This checks all the error cases! */
2198 if (*end)
2199 return 0;
2200 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2201 options->stat_name_width = name_width;
2202 options->stat_width = width;
2203 }
2204
2205 /* renames options */
2206 else if (!prefixcmp(arg, "-B")) {
2207 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2208 return -1;
2209 }
2210 else if (!prefixcmp(arg, "-M")) {
2211 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2212 return -1;
2213 options->detect_rename = DIFF_DETECT_RENAME;
2214 }
2215 else if (!prefixcmp(arg, "-C")) {
2216 if (options->detect_rename == DIFF_DETECT_COPY)
2217 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2218 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2219 return -1;
2220 options->detect_rename = DIFF_DETECT_COPY;
2221 }
2222 else if (!strcmp(arg, "--no-renames"))
2223 options->detect_rename = 0;
2224
2225 /* xdiff options */
2226 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2227 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2228 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2229 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2230 else if (!strcmp(arg, "--ignore-space-at-eol"))
2231 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2232
2233 /* flags options */
2234 else if (!strcmp(arg, "--binary")) {
2235 options->output_format |= DIFF_FORMAT_PATCH;
2236 DIFF_OPT_SET(options, BINARY);
2237 }
2238 else if (!strcmp(arg, "--full-index"))
2239 DIFF_OPT_SET(options, FULL_INDEX);
2240 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2241 DIFF_OPT_SET(options, TEXT);
2242 else if (!strcmp(arg, "-R"))
2243 DIFF_OPT_SET(options, REVERSE_DIFF);
2244 else if (!strcmp(arg, "--find-copies-harder"))
2245 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2246 else if (!strcmp(arg, "--follow"))
2247 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2248 else if (!strcmp(arg, "--color"))
2249 DIFF_OPT_SET(options, COLOR_DIFF);
2250 else if (!strcmp(arg, "--no-color"))
2251 DIFF_OPT_CLR(options, COLOR_DIFF);
2252 else if (!strcmp(arg, "--color-words"))
2253 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2254 else if (!strcmp(arg, "--exit-code"))
2255 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2256 else if (!strcmp(arg, "--quiet"))
2257 DIFF_OPT_SET(options, QUIET);
2258 else if (!strcmp(arg, "--ext-diff"))
2259 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2260 else if (!strcmp(arg, "--no-ext-diff"))
2261 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2262
2263 /* misc options */
2264 else if (!strcmp(arg, "-z"))
2265 options->line_termination = 0;
2266 else if (!prefixcmp(arg, "-l"))
2267 options->rename_limit = strtoul(arg+2, NULL, 10);
2268 else if (!prefixcmp(arg, "-S"))
2269 options->pickaxe = arg + 2;
2270 else if (!strcmp(arg, "--pickaxe-all"))
2271 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2272 else if (!strcmp(arg, "--pickaxe-regex"))
2273 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2274 else if (!prefixcmp(arg, "-O"))
2275 options->orderfile = arg + 2;
2276 else if (!prefixcmp(arg, "--diff-filter="))
2277 options->filter = arg + 14;
2278 else if (!strcmp(arg, "--abbrev"))
2279 options->abbrev = DEFAULT_ABBREV;
2280 else if (!prefixcmp(arg, "--abbrev=")) {
2281 options->abbrev = strtoul(arg + 9, NULL, 10);
2282 if (options->abbrev < MINIMUM_ABBREV)
2283 options->abbrev = MINIMUM_ABBREV;
2284 else if (40 < options->abbrev)
2285 options->abbrev = 40;
2286 }
2287 else
2288 return 0;
2289 return 1;
2290 }
2291
2292 static int parse_num(const char **cp_p)
2293 {
2294 unsigned long num, scale;
2295 int ch, dot;
2296 const char *cp = *cp_p;
2297
2298 num = 0;
2299 scale = 1;
2300 dot = 0;
2301 for(;;) {
2302 ch = *cp;
2303 if ( !dot && ch == '.' ) {
2304 scale = 1;
2305 dot = 1;
2306 } else if ( ch == '%' ) {
2307 scale = dot ? scale*100 : 100;
2308 cp++; /* % is always at the end */
2309 break;
2310 } else if ( ch >= '0' && ch <= '9' ) {
2311 if ( scale < 100000 ) {
2312 scale *= 10;
2313 num = (num*10) + (ch-'0');
2314 }
2315 } else {
2316 break;
2317 }
2318 cp++;
2319 }
2320 *cp_p = cp;
2321
2322 /* user says num divided by scale and we say internally that
2323 * is MAX_SCORE * num / scale.
2324 */
2325 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2326 }
2327
2328 static int diff_scoreopt_parse(const char *opt)
2329 {
2330 int opt1, opt2, cmd;
2331
2332 if (*opt++ != '-')
2333 return -1;
2334 cmd = *opt++;
2335 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2336 return -1; /* that is not a -M, -C nor -B option */
2337
2338 opt1 = parse_num(&opt);
2339 if (cmd != 'B')
2340 opt2 = 0;
2341 else {
2342 if (*opt == 0)
2343 opt2 = 0;
2344 else if (*opt != '/')
2345 return -1; /* we expect -B80/99 or -B80 */
2346 else {
2347 opt++;
2348 opt2 = parse_num(&opt);
2349 }
2350 }
2351 if (*opt != 0)
2352 return -1;
2353 return opt1 | (opt2 << 16);
2354 }
2355
2356 struct diff_queue_struct diff_queued_diff;
2357
2358 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2359 {
2360 if (queue->alloc <= queue->nr) {
2361 queue->alloc = alloc_nr(queue->alloc);
2362 queue->queue = xrealloc(queue->queue,
2363 sizeof(dp) * queue->alloc);
2364 }
2365 queue->queue[queue->nr++] = dp;
2366 }
2367
2368 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2369 struct diff_filespec *one,
2370 struct diff_filespec *two)
2371 {
2372 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2373 dp->one = one;
2374 dp->two = two;
2375 if (queue)
2376 diff_q(queue, dp);
2377 return dp;
2378 }
2379
2380 void diff_free_filepair(struct diff_filepair *p)
2381 {
2382 free_filespec(p->one);
2383 free_filespec(p->two);
2384 free(p);
2385 }
2386
2387 /* This is different from find_unique_abbrev() in that
2388 * it stuffs the result with dots for alignment.
2389 */
2390 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2391 {
2392 int abblen;
2393 const char *abbrev;
2394 if (len == 40)
2395 return sha1_to_hex(sha1);
2396
2397 abbrev = find_unique_abbrev(sha1, len);
2398 if (!abbrev)
2399 return sha1_to_hex(sha1);
2400 abblen = strlen(abbrev);
2401 if (abblen < 37) {
2402 static char hex[41];
2403 if (len < abblen && abblen <= len + 2)
2404 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2405 else
2406 sprintf(hex, "%s...", abbrev);
2407 return hex;
2408 }
2409 return sha1_to_hex(sha1);
2410 }
2411
2412 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2413 {
2414 int line_termination = opt->line_termination;
2415 int inter_name_termination = line_termination ? '\t' : '\0';
2416
2417 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2418 printf(":%06o %06o %s ", p->one->mode, p->two->mode,
2419 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2420 printf("%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2421 }
2422 if (p->score) {
2423 printf("%c%03d%c", p->status, similarity_index(p),
2424 inter_name_termination);
2425 } else {
2426 printf("%c%c", p->status, inter_name_termination);
2427 }
2428
2429 if (p->status == DIFF_STATUS_COPIED || p->status == DIFF_STATUS_RENAMED) {
2430 write_name_quoted(p->one->path, stdout, inter_name_termination);
2431 write_name_quoted(p->two->path, stdout, line_termination);
2432 } else {
2433 const char *path = p->one->mode ? p->one->path : p->two->path;
2434 write_name_quoted(path, stdout, line_termination);
2435 }
2436 }
2437
2438 int diff_unmodified_pair(struct diff_filepair *p)
2439 {
2440 /* This function is written stricter than necessary to support
2441 * the currently implemented transformers, but the idea is to
2442 * let transformers to produce diff_filepairs any way they want,
2443 * and filter and clean them up here before producing the output.
2444 */
2445 struct diff_filespec *one = p->one, *two = p->two;
2446
2447 if (DIFF_PAIR_UNMERGED(p))
2448 return 0; /* unmerged is interesting */
2449
2450 /* deletion, addition, mode or type change
2451 * and rename are all interesting.
2452 */
2453 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2454 DIFF_PAIR_MODE_CHANGED(p) ||
2455 strcmp(one->path, two->path))
2456 return 0;
2457
2458 /* both are valid and point at the same path. that is, we are
2459 * dealing with a change.
2460 */
2461 if (one->sha1_valid && two->sha1_valid &&
2462 !hashcmp(one->sha1, two->sha1))
2463 return 1; /* no change */
2464 if (!one->sha1_valid && !two->sha1_valid)
2465 return 1; /* both look at the same file on the filesystem. */
2466 return 0;
2467 }
2468
2469 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2470 {
2471 if (diff_unmodified_pair(p))
2472 return;
2473
2474 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2475 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2476 return; /* no tree diffs in patch format */
2477
2478 run_diff(p, o);
2479 }
2480
2481 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2482 struct diffstat_t *diffstat)
2483 {
2484 if (diff_unmodified_pair(p))
2485 return;
2486
2487 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2488 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2489 return; /* no tree diffs in patch format */
2490
2491 run_diffstat(p, o, diffstat);
2492 }
2493
2494 static void diff_flush_checkdiff(struct diff_filepair *p,
2495 struct diff_options *o)
2496 {
2497 if (diff_unmodified_pair(p))
2498 return;
2499
2500 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2501 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2502 return; /* no tree diffs in patch format */
2503
2504 run_checkdiff(p, o);
2505 }
2506
2507 int diff_queue_is_empty(void)
2508 {
2509 struct diff_queue_struct *q = &diff_queued_diff;
2510 int i;
2511 for (i = 0; i < q->nr; i++)
2512 if (!diff_unmodified_pair(q->queue[i]))
2513 return 0;
2514 return 1;
2515 }
2516
2517 #if DIFF_DEBUG
2518 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2519 {
2520 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2521 x, one ? one : "",
2522 s->path,
2523 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2524 s->mode,
2525 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2526 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2527 x, one ? one : "",
2528 s->size, s->xfrm_flags);
2529 }
2530
2531 void diff_debug_filepair(const struct diff_filepair *p, int i)
2532 {
2533 diff_debug_filespec(p->one, i, "one");
2534 diff_debug_filespec(p->two, i, "two");
2535 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2536 p->score, p->status ? p->status : '?',
2537 p->one->rename_used, p->broken_pair);
2538 }
2539
2540 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2541 {
2542 int i;
2543 if (msg)
2544 fprintf(stderr, "%s\n", msg);
2545 fprintf(stderr, "q->nr = %d\n", q->nr);
2546 for (i = 0; i < q->nr; i++) {
2547 struct diff_filepair *p = q->queue[i];
2548 diff_debug_filepair(p, i);
2549 }
2550 }
2551 #endif
2552
2553 static void diff_resolve_rename_copy(void)
2554 {
2555 int i;
2556 struct diff_filepair *p;
2557 struct diff_queue_struct *q = &diff_queued_diff;
2558
2559 diff_debug_queue("resolve-rename-copy", q);
2560
2561 for (i = 0; i < q->nr; i++) {
2562 p = q->queue[i];
2563 p->status = 0; /* undecided */
2564 if (DIFF_PAIR_UNMERGED(p))
2565 p->status = DIFF_STATUS_UNMERGED;
2566 else if (!DIFF_FILE_VALID(p->one))
2567 p->status = DIFF_STATUS_ADDED;
2568 else if (!DIFF_FILE_VALID(p->two))
2569 p->status = DIFF_STATUS_DELETED;
2570 else if (DIFF_PAIR_TYPE_CHANGED(p))
2571 p->status = DIFF_STATUS_TYPE_CHANGED;
2572
2573 /* from this point on, we are dealing with a pair
2574 * whose both sides are valid and of the same type, i.e.
2575 * either in-place edit or rename/copy edit.
2576 */
2577 else if (DIFF_PAIR_RENAME(p)) {
2578 /*
2579 * A rename might have re-connected a broken
2580 * pair up, causing the pathnames to be the
2581 * same again. If so, that's not a rename at
2582 * all, just a modification..
2583 *
2584 * Otherwise, see if this source was used for
2585 * multiple renames, in which case we decrement
2586 * the count, and call it a copy.
2587 */
2588 if (!strcmp(p->one->path, p->two->path))
2589 p->status = DIFF_STATUS_MODIFIED;
2590 else if (--p->one->rename_used > 0)
2591 p->status = DIFF_STATUS_COPIED;
2592 else
2593 p->status = DIFF_STATUS_RENAMED;
2594 }
2595 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2596 p->one->mode != p->two->mode ||
2597 is_null_sha1(p->one->sha1))
2598 p->status = DIFF_STATUS_MODIFIED;
2599 else {
2600 /* This is a "no-change" entry and should not
2601 * happen anymore, but prepare for broken callers.
2602 */
2603 error("feeding unmodified %s to diffcore",
2604 p->one->path);
2605 p->status = DIFF_STATUS_UNKNOWN;
2606 }
2607 }
2608 diff_debug_queue("resolve-rename-copy done", q);
2609 }
2610
2611 static int check_pair_status(struct diff_filepair *p)
2612 {
2613 switch (p->status) {
2614 case DIFF_STATUS_UNKNOWN:
2615 return 0;
2616 case 0:
2617 die("internal error in diff-resolve-rename-copy");
2618 default:
2619 return 1;
2620 }
2621 }
2622
2623 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2624 {
2625 int fmt = opt->output_format;
2626
2627 if (fmt & DIFF_FORMAT_CHECKDIFF)
2628 diff_flush_checkdiff(p, opt);
2629 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2630 diff_flush_raw(p, opt);
2631 else if (fmt & DIFF_FORMAT_NAME)
2632 write_name_quoted(p->two->path, stdout, opt->line_termination);
2633 }
2634
2635 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2636 {
2637 if (fs->mode)
2638 printf(" %s mode %06o ", newdelete, fs->mode);
2639 else
2640 printf(" %s ", newdelete);
2641 write_name_quoted(fs->path, stdout, '\n');
2642 }
2643
2644
2645 static void show_mode_change(struct diff_filepair *p, int show_name)
2646 {
2647 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2648 printf(" mode change %06o => %06o%c", p->one->mode, p->two->mode,
2649 show_name ? ' ' : '\n');
2650 if (show_name) {
2651 write_name_quoted(p->two->path, stdout, '\n');
2652 }
2653 }
2654 }
2655
2656 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2657 {
2658 char *names = pprint_rename(p->one->path, p->two->path);
2659
2660 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2661 free(names);
2662 show_mode_change(p, 0);
2663 }
2664
2665 static void diff_summary(struct diff_filepair *p)
2666 {
2667 switch(p->status) {
2668 case DIFF_STATUS_DELETED:
2669 show_file_mode_name("delete", p->one);
2670 break;
2671 case DIFF_STATUS_ADDED:
2672 show_file_mode_name("create", p->two);
2673 break;
2674 case DIFF_STATUS_COPIED:
2675 show_rename_copy("copy", p);
2676 break;
2677 case DIFF_STATUS_RENAMED:
2678 show_rename_copy("rename", p);
2679 break;
2680 default:
2681 if (p->score) {
2682 fputs(" rewrite ", stdout);
2683 write_name_quoted(p->two->path, stdout, ' ');
2684 printf("(%d%%)\n", similarity_index(p));
2685 }
2686 show_mode_change(p, !p->score);
2687 break;
2688 }
2689 }
2690
2691 struct patch_id_t {
2692 struct xdiff_emit_state xm;
2693 SHA_CTX *ctx;
2694 int patchlen;
2695 };
2696
2697 static int remove_space(char *line, int len)
2698 {
2699 int i;
2700 char *dst = line;
2701 unsigned char c;
2702
2703 for (i = 0; i < len; i++)
2704 if (!isspace((c = line[i])))
2705 *dst++ = c;
2706
2707 return dst - line;
2708 }
2709
2710 static void patch_id_consume(void *priv, char *line, unsigned long len)
2711 {
2712 struct patch_id_t *data = priv;
2713 int new_len;
2714
2715 /* Ignore line numbers when computing the SHA1 of the patch */
2716 if (!prefixcmp(line, "@@ -"))
2717 return;
2718
2719 new_len = remove_space(line, len);
2720
2721 SHA1_Update(data->ctx, line, new_len);
2722 data->patchlen += new_len;
2723 }
2724
2725 /* returns 0 upon success, and writes result into sha1 */
2726 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2727 {
2728 struct diff_queue_struct *q = &diff_queued_diff;
2729 int i;
2730 SHA_CTX ctx;
2731 struct patch_id_t data;
2732 char buffer[PATH_MAX * 4 + 20];
2733
2734 SHA1_Init(&ctx);
2735 memset(&data, 0, sizeof(struct patch_id_t));
2736 data.ctx = &ctx;
2737 data.xm.consume = patch_id_consume;
2738
2739 for (i = 0; i < q->nr; i++) {
2740 xpparam_t xpp;
2741 xdemitconf_t xecfg;
2742 xdemitcb_t ecb;
2743 mmfile_t mf1, mf2;
2744 struct diff_filepair *p = q->queue[i];
2745 int len1, len2;
2746
2747 memset(&xecfg, 0, sizeof(xecfg));
2748 if (p->status == 0)
2749 return error("internal diff status error");
2750 if (p->status == DIFF_STATUS_UNKNOWN)
2751 continue;
2752 if (diff_unmodified_pair(p))
2753 continue;
2754 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2755 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2756 continue;
2757 if (DIFF_PAIR_UNMERGED(p))
2758 continue;
2759
2760 diff_fill_sha1_info(p->one);
2761 diff_fill_sha1_info(p->two);
2762 if (fill_mmfile(&mf1, p->one) < 0 ||
2763 fill_mmfile(&mf2, p->two) < 0)
2764 return error("unable to read files to diff");
2765
2766 len1 = remove_space(p->one->path, strlen(p->one->path));
2767 len2 = remove_space(p->two->path, strlen(p->two->path));
2768 if (p->one->mode == 0)
2769 len1 = snprintf(buffer, sizeof(buffer),
2770 "diff--gita/%.*sb/%.*s"
2771 "newfilemode%06o"
2772 "---/dev/null"
2773 "+++b/%.*s",
2774 len1, p->one->path,
2775 len2, p->two->path,
2776 p->two->mode,
2777 len2, p->two->path);
2778 else if (p->two->mode == 0)
2779 len1 = snprintf(buffer, sizeof(buffer),
2780 "diff--gita/%.*sb/%.*s"
2781 "deletedfilemode%06o"
2782 "---a/%.*s"
2783 "+++/dev/null",
2784 len1, p->one->path,
2785 len2, p->two->path,
2786 p->one->mode,
2787 len1, p->one->path);
2788 else
2789 len1 = snprintf(buffer, sizeof(buffer),
2790 "diff--gita/%.*sb/%.*s"
2791 "---a/%.*s"
2792 "+++b/%.*s",
2793 len1, p->one->path,
2794 len2, p->two->path,
2795 len1, p->one->path,
2796 len2, p->two->path);
2797 SHA1_Update(&ctx, buffer, len1);
2798
2799 xpp.flags = XDF_NEED_MINIMAL;
2800 xecfg.ctxlen = 3;
2801 xecfg.flags = XDL_EMIT_FUNCNAMES;
2802 ecb.outf = xdiff_outf;
2803 ecb.priv = &data;
2804 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2805 }
2806
2807 SHA1_Final(sha1, &ctx);
2808 return 0;
2809 }
2810
2811 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2812 {
2813 struct diff_queue_struct *q = &diff_queued_diff;
2814 int i;
2815 int result = diff_get_patch_id(options, sha1);
2816
2817 for (i = 0; i < q->nr; i++)
2818 diff_free_filepair(q->queue[i]);
2819
2820 free(q->queue);
2821 q->queue = NULL;
2822 q->nr = q->alloc = 0;
2823
2824 return result;
2825 }
2826
2827 static int is_summary_empty(const struct diff_queue_struct *q)
2828 {
2829 int i;
2830
2831 for (i = 0; i < q->nr; i++) {
2832 const struct diff_filepair *p = q->queue[i];
2833
2834 switch (p->status) {
2835 case DIFF_STATUS_DELETED:
2836 case DIFF_STATUS_ADDED:
2837 case DIFF_STATUS_COPIED:
2838 case DIFF_STATUS_RENAMED:
2839 return 0;
2840 default:
2841 if (p->score)
2842 return 0;
2843 if (p->one->mode && p->two->mode &&
2844 p->one->mode != p->two->mode)
2845 return 0;
2846 break;
2847 }
2848 }
2849 return 1;
2850 }
2851
2852 void diff_flush(struct diff_options *options)
2853 {
2854 struct diff_queue_struct *q = &diff_queued_diff;
2855 int i, output_format = options->output_format;
2856 int separator = 0;
2857
2858 /*
2859 * Order: raw, stat, summary, patch
2860 * or: name/name-status/checkdiff (other bits clear)
2861 */
2862 if (!q->nr)
2863 goto free_queue;
2864
2865 if (output_format & (DIFF_FORMAT_RAW |
2866 DIFF_FORMAT_NAME |
2867 DIFF_FORMAT_NAME_STATUS |
2868 DIFF_FORMAT_CHECKDIFF)) {
2869 for (i = 0; i < q->nr; i++) {
2870 struct diff_filepair *p = q->queue[i];
2871 if (check_pair_status(p))
2872 flush_one_pair(p, options);
2873 }
2874 separator++;
2875 }
2876
2877 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2878 struct diffstat_t diffstat;
2879
2880 memset(&diffstat, 0, sizeof(struct diffstat_t));
2881 diffstat.xm.consume = diffstat_consume;
2882 for (i = 0; i < q->nr; i++) {
2883 struct diff_filepair *p = q->queue[i];
2884 if (check_pair_status(p))
2885 diff_flush_stat(p, options, &diffstat);
2886 }
2887 if (output_format & DIFF_FORMAT_NUMSTAT)
2888 show_numstat(&diffstat, options);
2889 if (output_format & DIFF_FORMAT_DIFFSTAT)
2890 show_stats(&diffstat, options);
2891 if (output_format & DIFF_FORMAT_SHORTSTAT)
2892 show_shortstats(&diffstat);
2893 free_diffstat_info(&diffstat);
2894 separator++;
2895 }
2896
2897 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2898 for (i = 0; i < q->nr; i++)
2899 diff_summary(q->queue[i]);
2900 separator++;
2901 }
2902
2903 if (output_format & DIFF_FORMAT_PATCH) {
2904 if (separator) {
2905 if (options->stat_sep) {
2906 /* attach patch instead of inline */
2907 fputs(options->stat_sep, stdout);
2908 } else {
2909 putchar(options->line_termination);
2910 }
2911 }
2912
2913 for (i = 0; i < q->nr; i++) {
2914 struct diff_filepair *p = q->queue[i];
2915 if (check_pair_status(p))
2916 diff_flush_patch(p, options);
2917 }
2918 }
2919
2920 if (output_format & DIFF_FORMAT_CALLBACK)
2921 options->format_callback(q, options, options->format_callback_data);
2922
2923 for (i = 0; i < q->nr; i++)
2924 diff_free_filepair(q->queue[i]);
2925 free_queue:
2926 free(q->queue);
2927 q->queue = NULL;
2928 q->nr = q->alloc = 0;
2929 }
2930
2931 static void diffcore_apply_filter(const char *filter)
2932 {
2933 int i;
2934 struct diff_queue_struct *q = &diff_queued_diff;
2935 struct diff_queue_struct outq;
2936 outq.queue = NULL;
2937 outq.nr = outq.alloc = 0;
2938
2939 if (!filter)
2940 return;
2941
2942 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2943 int found;
2944 for (i = found = 0; !found && i < q->nr; i++) {
2945 struct diff_filepair *p = q->queue[i];
2946 if (((p->status == DIFF_STATUS_MODIFIED) &&
2947 ((p->score &&
2948 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2949 (!p->score &&
2950 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2951 ((p->status != DIFF_STATUS_MODIFIED) &&
2952 strchr(filter, p->status)))
2953 found++;
2954 }
2955 if (found)
2956 return;
2957
2958 /* otherwise we will clear the whole queue
2959 * by copying the empty outq at the end of this
2960 * function, but first clear the current entries
2961 * in the queue.
2962 */
2963 for (i = 0; i < q->nr; i++)
2964 diff_free_filepair(q->queue[i]);
2965 }
2966 else {
2967 /* Only the matching ones */
2968 for (i = 0; i < q->nr; i++) {
2969 struct diff_filepair *p = q->queue[i];
2970
2971 if (((p->status == DIFF_STATUS_MODIFIED) &&
2972 ((p->score &&
2973 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2974 (!p->score &&
2975 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2976 ((p->status != DIFF_STATUS_MODIFIED) &&
2977 strchr(filter, p->status)))
2978 diff_q(&outq, p);
2979 else
2980 diff_free_filepair(p);
2981 }
2982 }
2983 free(q->queue);
2984 *q = outq;
2985 }
2986
2987 /* Check whether two filespecs with the same mode and size are identical */
2988 static int diff_filespec_is_identical(struct diff_filespec *one,
2989 struct diff_filespec *two)
2990 {
2991 if (S_ISGITLINK(one->mode)) {
2992 diff_fill_sha1_info(one);
2993 diff_fill_sha1_info(two);
2994 return !hashcmp(one->sha1, two->sha1);
2995 }
2996 if (diff_populate_filespec(one, 0))
2997 return 0;
2998 if (diff_populate_filespec(two, 0))
2999 return 0;
3000 return !memcmp(one->data, two->data, one->size);
3001 }
3002
3003 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3004 {
3005 int i;
3006 struct diff_queue_struct *q = &diff_queued_diff;
3007 struct diff_queue_struct outq;
3008 outq.queue = NULL;
3009 outq.nr = outq.alloc = 0;
3010
3011 for (i = 0; i < q->nr; i++) {
3012 struct diff_filepair *p = q->queue[i];
3013
3014 /*
3015 * 1. Entries that come from stat info dirtyness
3016 * always have both sides (iow, not create/delete),
3017 * one side of the object name is unknown, with
3018 * the same mode and size. Keep the ones that
3019 * do not match these criteria. They have real
3020 * differences.
3021 *
3022 * 2. At this point, the file is known to be modified,
3023 * with the same mode and size, and the object
3024 * name of one side is unknown. Need to inspect
3025 * the identical contents.
3026 */
3027 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3028 !DIFF_FILE_VALID(p->two) ||
3029 (p->one->sha1_valid && p->two->sha1_valid) ||
3030 (p->one->mode != p->two->mode) ||
3031 diff_populate_filespec(p->one, 1) ||
3032 diff_populate_filespec(p->two, 1) ||
3033 (p->one->size != p->two->size) ||
3034 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3035 diff_q(&outq, p);
3036 else {
3037 /*
3038 * The caller can subtract 1 from skip_stat_unmatch
3039 * to determine how many paths were dirty only
3040 * due to stat info mismatch.
3041 */
3042 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3043 diffopt->skip_stat_unmatch++;
3044 diff_free_filepair(p);
3045 }
3046 }
3047 free(q->queue);
3048 *q = outq;
3049 }
3050
3051 void diffcore_std(struct diff_options *options)
3052 {
3053 if (DIFF_OPT_TST(options, QUIET))
3054 return;
3055
3056 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3057 diffcore_skip_stat_unmatch(options);
3058 if (options->break_opt != -1)
3059 diffcore_break(options->break_opt);
3060 if (options->detect_rename)
3061 diffcore_rename(options);
3062 if (options->break_opt != -1)
3063 diffcore_merge_broken();
3064 if (options->pickaxe)
3065 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3066 if (options->orderfile)
3067 diffcore_order(options->orderfile);
3068 diff_resolve_rename_copy();
3069 diffcore_apply_filter(options->filter);
3070
3071 if (diff_queued_diff.nr)
3072 DIFF_OPT_SET(options, HAS_CHANGES);
3073 else
3074 DIFF_OPT_CLR(options, HAS_CHANGES);
3075 }
3076
3077 int diff_result_code(struct diff_options *opt, int status)
3078 {
3079 int result = 0;
3080 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3081 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3082 return status;
3083 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3084 DIFF_OPT_TST(opt, HAS_CHANGES))
3085 result |= 01;
3086 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3087 DIFF_OPT_TST(opt, CHECK_FAILED))
3088 result |= 02;
3089 return result;
3090 }
3091
3092 void diff_addremove(struct diff_options *options,
3093 int addremove, unsigned mode,
3094 const unsigned char *sha1,
3095 const char *base, const char *path)
3096 {
3097 char concatpath[PATH_MAX];
3098 struct diff_filespec *one, *two;
3099
3100 /* This may look odd, but it is a preparation for
3101 * feeding "there are unchanged files which should
3102 * not produce diffs, but when you are doing copy
3103 * detection you would need them, so here they are"
3104 * entries to the diff-core. They will be prefixed
3105 * with something like '=' or '*' (I haven't decided
3106 * which but should not make any difference).
3107 * Feeding the same new and old to diff_change()
3108 * also has the same effect.
3109 * Before the final output happens, they are pruned after
3110 * merged into rename/copy pairs as appropriate.
3111 */
3112 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3113 addremove = (addremove == '+' ? '-' :
3114 addremove == '-' ? '+' : addremove);
3115
3116 if (!path) path = "";
3117 sprintf(concatpath, "%s%s", base, path);
3118 one = alloc_filespec(concatpath);
3119 two = alloc_filespec(concatpath);
3120
3121 if (addremove != '+')
3122 fill_filespec(one, sha1, mode);
3123 if (addremove != '-')
3124 fill_filespec(two, sha1, mode);
3125
3126 diff_queue(&diff_queued_diff, one, two);
3127 DIFF_OPT_SET(options, HAS_CHANGES);
3128 }
3129
3130 void diff_change(struct diff_options *options,
3131 unsigned old_mode, unsigned new_mode,
3132 const unsigned char *old_sha1,
3133 const unsigned char *new_sha1,
3134 const char *base, const char *path)
3135 {
3136 char concatpath[PATH_MAX];
3137 struct diff_filespec *one, *two;
3138
3139 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3140 unsigned tmp;
3141 const unsigned char *tmp_c;
3142 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3143 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3144 }
3145 if (!path) path = "";
3146 sprintf(concatpath, "%s%s", base, path);
3147 one = alloc_filespec(concatpath);
3148 two = alloc_filespec(concatpath);
3149 fill_filespec(one, old_sha1, old_mode);
3150 fill_filespec(two, new_sha1, new_mode);
3151
3152 diff_queue(&diff_queued_diff, one, two);
3153 DIFF_OPT_SET(options, HAS_CHANGES);
3154 }
3155
3156 void diff_unmerge(struct diff_options *options,
3157 const char *path,
3158 unsigned mode, const unsigned char *sha1)
3159 {
3160 struct diff_filespec *one, *two;
3161 one = alloc_filespec(path);
3162 two = alloc_filespec(path);
3163 fill_filespec(one, sha1, mode);
3164 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3165 }
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