Unify whitespace checking
[git/git.git] / diff.c
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%s:%s ", data->filename, data->lineno,
977 ws, err, reset);
978 free(err);
979 emit_line(set, reset, line, 1);
980 (void)check_and_emit_line(line + 1, len - 1, data->ws_rule,
981 stdout, set, reset, ws);
982 data->lineno++;
983 } else if (line[0] == ' ')
984 data->lineno++;
985 else if (line[0] == '@') {
986 char *plus = strchr(line, '+');
987 if (plus)
988 data->lineno = strtol(plus, NULL, 10);
989 else
990 die("invalid diff");
991 }
992 }
993
994 static unsigned char *deflate_it(char *data,
995 unsigned long size,
996 unsigned long *result_size)
997 {
998 int bound;
999 unsigned char *deflated;
1000 z_stream stream;
1001
1002 memset(&stream, 0, sizeof(stream));
1003 deflateInit(&stream, zlib_compression_level);
1004 bound = deflateBound(&stream, size);
1005 deflated = xmalloc(bound);
1006 stream.next_out = deflated;
1007 stream.avail_out = bound;
1008
1009 stream.next_in = (unsigned char *)data;
1010 stream.avail_in = size;
1011 while (deflate(&stream, Z_FINISH) == Z_OK)
1012 ; /* nothing */
1013 deflateEnd(&stream);
1014 *result_size = stream.total_out;
1015 return deflated;
1016 }
1017
1018 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1019 {
1020 void *cp;
1021 void *delta;
1022 void *deflated;
1023 void *data;
1024 unsigned long orig_size;
1025 unsigned long delta_size;
1026 unsigned long deflate_size;
1027 unsigned long data_size;
1028
1029 /* We could do deflated delta, or we could do just deflated two,
1030 * whichever is smaller.
1031 */
1032 delta = NULL;
1033 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1034 if (one->size && two->size) {
1035 delta = diff_delta(one->ptr, one->size,
1036 two->ptr, two->size,
1037 &delta_size, deflate_size);
1038 if (delta) {
1039 void *to_free = delta;
1040 orig_size = delta_size;
1041 delta = deflate_it(delta, delta_size, &delta_size);
1042 free(to_free);
1043 }
1044 }
1045
1046 if (delta && delta_size < deflate_size) {
1047 printf("delta %lu\n", orig_size);
1048 free(deflated);
1049 data = delta;
1050 data_size = delta_size;
1051 }
1052 else {
1053 printf("literal %lu\n", two->size);
1054 free(delta);
1055 data = deflated;
1056 data_size = deflate_size;
1057 }
1058
1059 /* emit data encoded in base85 */
1060 cp = data;
1061 while (data_size) {
1062 int bytes = (52 < data_size) ? 52 : data_size;
1063 char line[70];
1064 data_size -= bytes;
1065 if (bytes <= 26)
1066 line[0] = bytes + 'A' - 1;
1067 else
1068 line[0] = bytes - 26 + 'a' - 1;
1069 encode_85(line + 1, cp, bytes);
1070 cp = (char *) cp + bytes;
1071 puts(line);
1072 }
1073 printf("\n");
1074 free(data);
1075 }
1076
1077 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1078 {
1079 printf("GIT binary patch\n");
1080 emit_binary_diff_body(one, two);
1081 emit_binary_diff_body(two, one);
1082 }
1083
1084 static void setup_diff_attr_check(struct git_attr_check *check)
1085 {
1086 static struct git_attr *attr_diff;
1087
1088 if (!attr_diff) {
1089 attr_diff = git_attr("diff", 4);
1090 }
1091 check[0].attr = attr_diff;
1092 }
1093
1094 static void diff_filespec_check_attr(struct diff_filespec *one)
1095 {
1096 struct git_attr_check attr_diff_check;
1097 int check_from_data = 0;
1098
1099 if (one->checked_attr)
1100 return;
1101
1102 setup_diff_attr_check(&attr_diff_check);
1103 one->is_binary = 0;
1104 one->funcname_pattern_ident = NULL;
1105
1106 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1107 const char *value;
1108
1109 /* binaryness */
1110 value = attr_diff_check.value;
1111 if (ATTR_TRUE(value))
1112 ;
1113 else if (ATTR_FALSE(value))
1114 one->is_binary = 1;
1115 else
1116 check_from_data = 1;
1117
1118 /* funcname pattern ident */
1119 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1120 ;
1121 else
1122 one->funcname_pattern_ident = value;
1123 }
1124
1125 if (check_from_data) {
1126 if (!one->data && DIFF_FILE_VALID(one))
1127 diff_populate_filespec(one, 0);
1128
1129 if (one->data)
1130 one->is_binary = buffer_is_binary(one->data, one->size);
1131 }
1132 }
1133
1134 int diff_filespec_is_binary(struct diff_filespec *one)
1135 {
1136 diff_filespec_check_attr(one);
1137 return one->is_binary;
1138 }
1139
1140 static const char *funcname_pattern(const char *ident)
1141 {
1142 struct funcname_pattern *pp;
1143
1144 read_config_if_needed();
1145 for (pp = funcname_pattern_list; pp; pp = pp->next)
1146 if (!strcmp(ident, pp->name))
1147 return pp->pattern;
1148 return NULL;
1149 }
1150
1151 static struct builtin_funcname_pattern {
1152 const char *name;
1153 const char *pattern;
1154 } builtin_funcname_pattern[] = {
1155 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1156 "new\\|return\\|switch\\|throw\\|while\\)\n"
1157 "^[ ]*\\(\\([ ]*"
1158 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1159 "[ ]*([^;]*$\\)" },
1160 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1161 };
1162
1163 static const char *diff_funcname_pattern(struct diff_filespec *one)
1164 {
1165 const char *ident, *pattern;
1166 int i;
1167
1168 diff_filespec_check_attr(one);
1169 ident = one->funcname_pattern_ident;
1170
1171 if (!ident)
1172 /*
1173 * If the config file has "funcname.default" defined, that
1174 * regexp is used; otherwise NULL is returned and xemit uses
1175 * the built-in default.
1176 */
1177 return funcname_pattern("default");
1178
1179 /* Look up custom "funcname.$ident" regexp from config. */
1180 pattern = funcname_pattern(ident);
1181 if (pattern)
1182 return pattern;
1183
1184 /*
1185 * And define built-in fallback patterns here. Note that
1186 * these can be overriden by the user's config settings.
1187 */
1188 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1189 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1190 return builtin_funcname_pattern[i].pattern;
1191
1192 return NULL;
1193 }
1194
1195 static void builtin_diff(const char *name_a,
1196 const char *name_b,
1197 struct diff_filespec *one,
1198 struct diff_filespec *two,
1199 const char *xfrm_msg,
1200 struct diff_options *o,
1201 int complete_rewrite)
1202 {
1203 mmfile_t mf1, mf2;
1204 const char *lbl[2];
1205 char *a_one, *b_two;
1206 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1207 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1208
1209 a_one = quote_two("a/", name_a + (*name_a == '/'));
1210 b_two = quote_two("b/", name_b + (*name_b == '/'));
1211 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1212 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1213 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1214 if (lbl[0][0] == '/') {
1215 /* /dev/null */
1216 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1217 if (xfrm_msg && xfrm_msg[0])
1218 printf("%s%s%s\n", set, xfrm_msg, reset);
1219 }
1220 else if (lbl[1][0] == '/') {
1221 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1222 if (xfrm_msg && xfrm_msg[0])
1223 printf("%s%s%s\n", set, xfrm_msg, reset);
1224 }
1225 else {
1226 if (one->mode != two->mode) {
1227 printf("%sold mode %06o%s\n", set, one->mode, reset);
1228 printf("%snew mode %06o%s\n", set, two->mode, reset);
1229 }
1230 if (xfrm_msg && xfrm_msg[0])
1231 printf("%s%s%s\n", set, xfrm_msg, reset);
1232 /*
1233 * we do not run diff between different kind
1234 * of objects.
1235 */
1236 if ((one->mode ^ two->mode) & S_IFMT)
1237 goto free_ab_and_return;
1238 if (complete_rewrite) {
1239 emit_rewrite_diff(name_a, name_b, one, two,
1240 DIFF_OPT_TST(o, COLOR_DIFF));
1241 o->found_changes = 1;
1242 goto free_ab_and_return;
1243 }
1244 }
1245
1246 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1247 die("unable to read files to diff");
1248
1249 if (!DIFF_OPT_TST(o, TEXT) &&
1250 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1251 /* Quite common confusing case */
1252 if (mf1.size == mf2.size &&
1253 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1254 goto free_ab_and_return;
1255 if (DIFF_OPT_TST(o, BINARY))
1256 emit_binary_diff(&mf1, &mf2);
1257 else
1258 printf("Binary files %s and %s differ\n",
1259 lbl[0], lbl[1]);
1260 o->found_changes = 1;
1261 }
1262 else {
1263 /* Crazy xdl interfaces.. */
1264 const char *diffopts = getenv("GIT_DIFF_OPTS");
1265 xpparam_t xpp;
1266 xdemitconf_t xecfg;
1267 xdemitcb_t ecb;
1268 struct emit_callback ecbdata;
1269 const char *funcname_pattern;
1270
1271 funcname_pattern = diff_funcname_pattern(one);
1272 if (!funcname_pattern)
1273 funcname_pattern = diff_funcname_pattern(two);
1274
1275 memset(&xecfg, 0, sizeof(xecfg));
1276 memset(&ecbdata, 0, sizeof(ecbdata));
1277 ecbdata.label_path = lbl;
1278 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1279 ecbdata.found_changesp = &o->found_changes;
1280 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1281 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1282 xecfg.ctxlen = o->context;
1283 xecfg.flags = XDL_EMIT_FUNCNAMES;
1284 if (funcname_pattern)
1285 xdiff_set_find_func(&xecfg, funcname_pattern);
1286 if (!diffopts)
1287 ;
1288 else if (!prefixcmp(diffopts, "--unified="))
1289 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1290 else if (!prefixcmp(diffopts, "-u"))
1291 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1292 ecb.outf = xdiff_outf;
1293 ecb.priv = &ecbdata;
1294 ecbdata.xm.consume = fn_out_consume;
1295 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1296 ecbdata.diff_words =
1297 xcalloc(1, sizeof(struct diff_words_data));
1298 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1299 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1300 free_diff_words_data(&ecbdata);
1301 }
1302
1303 free_ab_and_return:
1304 diff_free_filespec_data(one);
1305 diff_free_filespec_data(two);
1306 free(a_one);
1307 free(b_two);
1308 return;
1309 }
1310
1311 static void builtin_diffstat(const char *name_a, const char *name_b,
1312 struct diff_filespec *one,
1313 struct diff_filespec *two,
1314 struct diffstat_t *diffstat,
1315 struct diff_options *o,
1316 int complete_rewrite)
1317 {
1318 mmfile_t mf1, mf2;
1319 struct diffstat_file *data;
1320
1321 data = diffstat_add(diffstat, name_a, name_b);
1322
1323 if (!one || !two) {
1324 data->is_unmerged = 1;
1325 return;
1326 }
1327 if (complete_rewrite) {
1328 diff_populate_filespec(one, 0);
1329 diff_populate_filespec(two, 0);
1330 data->deleted = count_lines(one->data, one->size);
1331 data->added = count_lines(two->data, two->size);
1332 goto free_and_return;
1333 }
1334 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1335 die("unable to read files to diff");
1336
1337 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1338 data->is_binary = 1;
1339 data->added = mf2.size;
1340 data->deleted = mf1.size;
1341 } else {
1342 /* Crazy xdl interfaces.. */
1343 xpparam_t xpp;
1344 xdemitconf_t xecfg;
1345 xdemitcb_t ecb;
1346
1347 memset(&xecfg, 0, sizeof(xecfg));
1348 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1349 ecb.outf = xdiff_outf;
1350 ecb.priv = diffstat;
1351 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1352 }
1353
1354 free_and_return:
1355 diff_free_filespec_data(one);
1356 diff_free_filespec_data(two);
1357 }
1358
1359 static void builtin_checkdiff(const char *name_a, const char *name_b,
1360 struct diff_filespec *one,
1361 struct diff_filespec *two, struct diff_options *o)
1362 {
1363 mmfile_t mf1, mf2;
1364 struct checkdiff_t data;
1365
1366 if (!two)
1367 return;
1368
1369 memset(&data, 0, sizeof(data));
1370 data.xm.consume = checkdiff_consume;
1371 data.filename = name_b ? name_b : name_a;
1372 data.lineno = 0;
1373 data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1374 data.ws_rule = whitespace_rule(data.filename);
1375
1376 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1377 die("unable to read files to diff");
1378
1379 if (diff_filespec_is_binary(two))
1380 goto free_and_return;
1381 else {
1382 /* Crazy xdl interfaces.. */
1383 xpparam_t xpp;
1384 xdemitconf_t xecfg;
1385 xdemitcb_t ecb;
1386
1387 memset(&xecfg, 0, sizeof(xecfg));
1388 xpp.flags = XDF_NEED_MINIMAL;
1389 ecb.outf = xdiff_outf;
1390 ecb.priv = &data;
1391 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1392 }
1393 free_and_return:
1394 diff_free_filespec_data(one);
1395 diff_free_filespec_data(two);
1396 if (data.status)
1397 DIFF_OPT_SET(o, CHECK_FAILED);
1398 }
1399
1400 struct diff_filespec *alloc_filespec(const char *path)
1401 {
1402 int namelen = strlen(path);
1403 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1404
1405 memset(spec, 0, sizeof(*spec));
1406 spec->path = (char *)(spec + 1);
1407 memcpy(spec->path, path, namelen+1);
1408 spec->count = 1;
1409 return spec;
1410 }
1411
1412 void free_filespec(struct diff_filespec *spec)
1413 {
1414 if (!--spec->count) {
1415 diff_free_filespec_data(spec);
1416 free(spec);
1417 }
1418 }
1419
1420 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1421 unsigned short mode)
1422 {
1423 if (mode) {
1424 spec->mode = canon_mode(mode);
1425 hashcpy(spec->sha1, sha1);
1426 spec->sha1_valid = !is_null_sha1(sha1);
1427 }
1428 }
1429
1430 /*
1431 * Given a name and sha1 pair, if the index tells us the file in
1432 * the work tree has that object contents, return true, so that
1433 * prepare_temp_file() does not have to inflate and extract.
1434 */
1435 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1436 {
1437 struct cache_entry *ce;
1438 struct stat st;
1439 int pos, len;
1440
1441 /* We do not read the cache ourselves here, because the
1442 * benchmark with my previous version that always reads cache
1443 * shows that it makes things worse for diff-tree comparing
1444 * two linux-2.6 kernel trees in an already checked out work
1445 * tree. This is because most diff-tree comparisons deal with
1446 * only a small number of files, while reading the cache is
1447 * expensive for a large project, and its cost outweighs the
1448 * savings we get by not inflating the object to a temporary
1449 * file. Practically, this code only helps when we are used
1450 * by diff-cache --cached, which does read the cache before
1451 * calling us.
1452 */
1453 if (!active_cache)
1454 return 0;
1455
1456 /* We want to avoid the working directory if our caller
1457 * doesn't need the data in a normal file, this system
1458 * is rather slow with its stat/open/mmap/close syscalls,
1459 * and the object is contained in a pack file. The pack
1460 * is probably already open and will be faster to obtain
1461 * the data through than the working directory. Loose
1462 * objects however would tend to be slower as they need
1463 * to be individually opened and inflated.
1464 */
1465 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1466 return 0;
1467
1468 len = strlen(name);
1469 pos = cache_name_pos(name, len);
1470 if (pos < 0)
1471 return 0;
1472 ce = active_cache[pos];
1473 if ((lstat(name, &st) < 0) ||
1474 !S_ISREG(st.st_mode) || /* careful! */
1475 ce_match_stat(ce, &st, 0) ||
1476 hashcmp(sha1, ce->sha1))
1477 return 0;
1478 /* we return 1 only when we can stat, it is a regular file,
1479 * stat information matches, and sha1 recorded in the cache
1480 * matches. I.e. we know the file in the work tree really is
1481 * the same as the <name, sha1> pair.
1482 */
1483 return 1;
1484 }
1485
1486 static int populate_from_stdin(struct diff_filespec *s)
1487 {
1488 struct strbuf buf;
1489 size_t size = 0;
1490
1491 strbuf_init(&buf, 0);
1492 if (strbuf_read(&buf, 0, 0) < 0)
1493 return error("error while reading from stdin %s",
1494 strerror(errno));
1495
1496 s->should_munmap = 0;
1497 s->data = strbuf_detach(&buf, &size);
1498 s->size = size;
1499 s->should_free = 1;
1500 return 0;
1501 }
1502
1503 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1504 {
1505 int len;
1506 char *data = xmalloc(100);
1507 len = snprintf(data, 100,
1508 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1509 s->data = data;
1510 s->size = len;
1511 s->should_free = 1;
1512 if (size_only) {
1513 s->data = NULL;
1514 free(data);
1515 }
1516 return 0;
1517 }
1518
1519 /*
1520 * While doing rename detection and pickaxe operation, we may need to
1521 * grab the data for the blob (or file) for our own in-core comparison.
1522 * diff_filespec has data and size fields for this purpose.
1523 */
1524 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1525 {
1526 int err = 0;
1527 if (!DIFF_FILE_VALID(s))
1528 die("internal error: asking to populate invalid file.");
1529 if (S_ISDIR(s->mode))
1530 return -1;
1531
1532 if (s->data)
1533 return 0;
1534
1535 if (size_only && 0 < s->size)
1536 return 0;
1537
1538 if (S_ISGITLINK(s->mode))
1539 return diff_populate_gitlink(s, size_only);
1540
1541 if (!s->sha1_valid ||
1542 reuse_worktree_file(s->path, s->sha1, 0)) {
1543 struct strbuf buf;
1544 struct stat st;
1545 int fd;
1546
1547 if (!strcmp(s->path, "-"))
1548 return populate_from_stdin(s);
1549
1550 if (lstat(s->path, &st) < 0) {
1551 if (errno == ENOENT) {
1552 err_empty:
1553 err = -1;
1554 empty:
1555 s->data = (char *)"";
1556 s->size = 0;
1557 return err;
1558 }
1559 }
1560 s->size = xsize_t(st.st_size);
1561 if (!s->size)
1562 goto empty;
1563 if (size_only)
1564 return 0;
1565 if (S_ISLNK(st.st_mode)) {
1566 int ret;
1567 s->data = xmalloc(s->size);
1568 s->should_free = 1;
1569 ret = readlink(s->path, s->data, s->size);
1570 if (ret < 0) {
1571 free(s->data);
1572 goto err_empty;
1573 }
1574 return 0;
1575 }
1576 fd = open(s->path, O_RDONLY);
1577 if (fd < 0)
1578 goto err_empty;
1579 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1580 close(fd);
1581 s->should_munmap = 1;
1582
1583 /*
1584 * Convert from working tree format to canonical git format
1585 */
1586 strbuf_init(&buf, 0);
1587 if (convert_to_git(s->path, s->data, s->size, &buf)) {
1588 size_t size = 0;
1589 munmap(s->data, s->size);
1590 s->should_munmap = 0;
1591 s->data = strbuf_detach(&buf, &size);
1592 s->size = size;
1593 s->should_free = 1;
1594 }
1595 }
1596 else {
1597 enum object_type type;
1598 if (size_only)
1599 type = sha1_object_info(s->sha1, &s->size);
1600 else {
1601 s->data = read_sha1_file(s->sha1, &type, &s->size);
1602 s->should_free = 1;
1603 }
1604 }
1605 return 0;
1606 }
1607
1608 void diff_free_filespec_blob(struct diff_filespec *s)
1609 {
1610 if (s->should_free)
1611 free(s->data);
1612 else if (s->should_munmap)
1613 munmap(s->data, s->size);
1614
1615 if (s->should_free || s->should_munmap) {
1616 s->should_free = s->should_munmap = 0;
1617 s->data = NULL;
1618 }
1619 }
1620
1621 void diff_free_filespec_data(struct diff_filespec *s)
1622 {
1623 diff_free_filespec_blob(s);
1624 free(s->cnt_data);
1625 s->cnt_data = NULL;
1626 }
1627
1628 static void prep_temp_blob(struct diff_tempfile *temp,
1629 void *blob,
1630 unsigned long size,
1631 const unsigned char *sha1,
1632 int mode)
1633 {
1634 int fd;
1635
1636 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1637 if (fd < 0)
1638 die("unable to create temp-file: %s", strerror(errno));
1639 if (write_in_full(fd, blob, size) != size)
1640 die("unable to write temp-file");
1641 close(fd);
1642 temp->name = temp->tmp_path;
1643 strcpy(temp->hex, sha1_to_hex(sha1));
1644 temp->hex[40] = 0;
1645 sprintf(temp->mode, "%06o", mode);
1646 }
1647
1648 static void prepare_temp_file(const char *name,
1649 struct diff_tempfile *temp,
1650 struct diff_filespec *one)
1651 {
1652 if (!DIFF_FILE_VALID(one)) {
1653 not_a_valid_file:
1654 /* A '-' entry produces this for file-2, and
1655 * a '+' entry produces this for file-1.
1656 */
1657 temp->name = "/dev/null";
1658 strcpy(temp->hex, ".");
1659 strcpy(temp->mode, ".");
1660 return;
1661 }
1662
1663 if (!one->sha1_valid ||
1664 reuse_worktree_file(name, one->sha1, 1)) {
1665 struct stat st;
1666 if (lstat(name, &st) < 0) {
1667 if (errno == ENOENT)
1668 goto not_a_valid_file;
1669 die("stat(%s): %s", name, strerror(errno));
1670 }
1671 if (S_ISLNK(st.st_mode)) {
1672 int ret;
1673 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1674 size_t sz = xsize_t(st.st_size);
1675 if (sizeof(buf) <= st.st_size)
1676 die("symlink too long: %s", name);
1677 ret = readlink(name, buf, sz);
1678 if (ret < 0)
1679 die("readlink(%s)", name);
1680 prep_temp_blob(temp, buf, sz,
1681 (one->sha1_valid ?
1682 one->sha1 : null_sha1),
1683 (one->sha1_valid ?
1684 one->mode : S_IFLNK));
1685 }
1686 else {
1687 /* we can borrow from the file in the work tree */
1688 temp->name = name;
1689 if (!one->sha1_valid)
1690 strcpy(temp->hex, sha1_to_hex(null_sha1));
1691 else
1692 strcpy(temp->hex, sha1_to_hex(one->sha1));
1693 /* Even though we may sometimes borrow the
1694 * contents from the work tree, we always want
1695 * one->mode. mode is trustworthy even when
1696 * !(one->sha1_valid), as long as
1697 * DIFF_FILE_VALID(one).
1698 */
1699 sprintf(temp->mode, "%06o", one->mode);
1700 }
1701 return;
1702 }
1703 else {
1704 if (diff_populate_filespec(one, 0))
1705 die("cannot read data blob for %s", one->path);
1706 prep_temp_blob(temp, one->data, one->size,
1707 one->sha1, one->mode);
1708 }
1709 }
1710
1711 static void remove_tempfile(void)
1712 {
1713 int i;
1714
1715 for (i = 0; i < 2; i++)
1716 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1717 unlink(diff_temp[i].name);
1718 diff_temp[i].name = NULL;
1719 }
1720 }
1721
1722 static void remove_tempfile_on_signal(int signo)
1723 {
1724 remove_tempfile();
1725 signal(SIGINT, SIG_DFL);
1726 raise(signo);
1727 }
1728
1729 /* An external diff command takes:
1730 *
1731 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1732 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1733 *
1734 */
1735 static void run_external_diff(const char *pgm,
1736 const char *name,
1737 const char *other,
1738 struct diff_filespec *one,
1739 struct diff_filespec *two,
1740 const char *xfrm_msg,
1741 int complete_rewrite)
1742 {
1743 const char *spawn_arg[10];
1744 struct diff_tempfile *temp = diff_temp;
1745 int retval;
1746 static int atexit_asked = 0;
1747 const char *othername;
1748 const char **arg = &spawn_arg[0];
1749
1750 othername = (other? other : name);
1751 if (one && two) {
1752 prepare_temp_file(name, &temp[0], one);
1753 prepare_temp_file(othername, &temp[1], two);
1754 if (! atexit_asked &&
1755 (temp[0].name == temp[0].tmp_path ||
1756 temp[1].name == temp[1].tmp_path)) {
1757 atexit_asked = 1;
1758 atexit(remove_tempfile);
1759 }
1760 signal(SIGINT, remove_tempfile_on_signal);
1761 }
1762
1763 if (one && two) {
1764 *arg++ = pgm;
1765 *arg++ = name;
1766 *arg++ = temp[0].name;
1767 *arg++ = temp[0].hex;
1768 *arg++ = temp[0].mode;
1769 *arg++ = temp[1].name;
1770 *arg++ = temp[1].hex;
1771 *arg++ = temp[1].mode;
1772 if (other) {
1773 *arg++ = other;
1774 *arg++ = xfrm_msg;
1775 }
1776 } else {
1777 *arg++ = pgm;
1778 *arg++ = name;
1779 }
1780 *arg = NULL;
1781 fflush(NULL);
1782 retval = run_command_v_opt(spawn_arg, 0);
1783 remove_tempfile();
1784 if (retval) {
1785 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1786 exit(1);
1787 }
1788 }
1789
1790 static const char *external_diff_attr(const char *name)
1791 {
1792 struct git_attr_check attr_diff_check;
1793
1794 setup_diff_attr_check(&attr_diff_check);
1795 if (!git_checkattr(name, 1, &attr_diff_check)) {
1796 const char *value = attr_diff_check.value;
1797 if (!ATTR_TRUE(value) &&
1798 !ATTR_FALSE(value) &&
1799 !ATTR_UNSET(value)) {
1800 struct ll_diff_driver *drv;
1801
1802 read_config_if_needed();
1803 for (drv = user_diff; drv; drv = drv->next)
1804 if (!strcmp(drv->name, value))
1805 return drv->cmd;
1806 }
1807 }
1808 return NULL;
1809 }
1810
1811 static void run_diff_cmd(const char *pgm,
1812 const char *name,
1813 const char *other,
1814 struct diff_filespec *one,
1815 struct diff_filespec *two,
1816 const char *xfrm_msg,
1817 struct diff_options *o,
1818 int complete_rewrite)
1819 {
1820 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
1821 pgm = NULL;
1822 else {
1823 const char *cmd = external_diff_attr(name);
1824 if (cmd)
1825 pgm = cmd;
1826 }
1827
1828 if (pgm) {
1829 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1830 complete_rewrite);
1831 return;
1832 }
1833 if (one && two)
1834 builtin_diff(name, other ? other : name,
1835 one, two, xfrm_msg, o, complete_rewrite);
1836 else
1837 printf("* Unmerged path %s\n", name);
1838 }
1839
1840 static void diff_fill_sha1_info(struct diff_filespec *one)
1841 {
1842 if (DIFF_FILE_VALID(one)) {
1843 if (!one->sha1_valid) {
1844 struct stat st;
1845 if (!strcmp(one->path, "-")) {
1846 hashcpy(one->sha1, null_sha1);
1847 return;
1848 }
1849 if (lstat(one->path, &st) < 0)
1850 die("stat %s", one->path);
1851 if (index_path(one->sha1, one->path, &st, 0))
1852 die("cannot hash %s\n", one->path);
1853 }
1854 }
1855 else
1856 hashclr(one->sha1);
1857 }
1858
1859 static int similarity_index(struct diff_filepair *p)
1860 {
1861 return p->score * 100 / MAX_SCORE;
1862 }
1863
1864 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1865 {
1866 const char *pgm = external_diff();
1867 struct strbuf msg;
1868 char *xfrm_msg;
1869 struct diff_filespec *one = p->one;
1870 struct diff_filespec *two = p->two;
1871 const char *name;
1872 const char *other;
1873 int complete_rewrite = 0;
1874
1875
1876 if (DIFF_PAIR_UNMERGED(p)) {
1877 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1878 return;
1879 }
1880
1881 name = p->one->path;
1882 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1883 diff_fill_sha1_info(one);
1884 diff_fill_sha1_info(two);
1885
1886 strbuf_init(&msg, PATH_MAX * 2 + 300);
1887 switch (p->status) {
1888 case DIFF_STATUS_COPIED:
1889 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1890 strbuf_addstr(&msg, "\ncopy from ");
1891 quote_c_style(name, &msg, NULL, 0);
1892 strbuf_addstr(&msg, "\ncopy to ");
1893 quote_c_style(other, &msg, NULL, 0);
1894 strbuf_addch(&msg, '\n');
1895 break;
1896 case DIFF_STATUS_RENAMED:
1897 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1898 strbuf_addstr(&msg, "\nrename from ");
1899 quote_c_style(name, &msg, NULL, 0);
1900 strbuf_addstr(&msg, "\nrename to ");
1901 quote_c_style(other, &msg, NULL, 0);
1902 strbuf_addch(&msg, '\n');
1903 break;
1904 case DIFF_STATUS_MODIFIED:
1905 if (p->score) {
1906 strbuf_addf(&msg, "dissimilarity index %d%%\n",
1907 similarity_index(p));
1908 complete_rewrite = 1;
1909 break;
1910 }
1911 /* fallthru */
1912 default:
1913 /* nothing */
1914 ;
1915 }
1916
1917 if (hashcmp(one->sha1, two->sha1)) {
1918 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
1919
1920 if (DIFF_OPT_TST(o, BINARY)) {
1921 mmfile_t mf;
1922 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
1923 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
1924 abbrev = 40;
1925 }
1926 strbuf_addf(&msg, "index %.*s..%.*s",
1927 abbrev, sha1_to_hex(one->sha1),
1928 abbrev, sha1_to_hex(two->sha1));
1929 if (one->mode == two->mode)
1930 strbuf_addf(&msg, " %06o", one->mode);
1931 strbuf_addch(&msg, '\n');
1932 }
1933
1934 if (msg.len)
1935 strbuf_setlen(&msg, msg.len - 1);
1936 xfrm_msg = msg.len ? msg.buf : NULL;
1937
1938 if (!pgm &&
1939 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1940 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1941 /* a filepair that changes between file and symlink
1942 * needs to be split into deletion and creation.
1943 */
1944 struct diff_filespec *null = alloc_filespec(two->path);
1945 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1946 free(null);
1947 null = alloc_filespec(one->path);
1948 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1949 free(null);
1950 }
1951 else
1952 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1953 complete_rewrite);
1954
1955 strbuf_release(&msg);
1956 }
1957
1958 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1959 struct diffstat_t *diffstat)
1960 {
1961 const char *name;
1962 const char *other;
1963 int complete_rewrite = 0;
1964
1965 if (DIFF_PAIR_UNMERGED(p)) {
1966 /* unmerged */
1967 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1968 return;
1969 }
1970
1971 name = p->one->path;
1972 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1973
1974 diff_fill_sha1_info(p->one);
1975 diff_fill_sha1_info(p->two);
1976
1977 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1978 complete_rewrite = 1;
1979 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
1980 }
1981
1982 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1983 {
1984 const char *name;
1985 const char *other;
1986
1987 if (DIFF_PAIR_UNMERGED(p)) {
1988 /* unmerged */
1989 return;
1990 }
1991
1992 name = p->one->path;
1993 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1994
1995 diff_fill_sha1_info(p->one);
1996 diff_fill_sha1_info(p->two);
1997
1998 builtin_checkdiff(name, other, p->one, p->two, o);
1999 }
2000
2001 void diff_setup(struct diff_options *options)
2002 {
2003 memset(options, 0, sizeof(*options));
2004 options->line_termination = '\n';
2005 options->break_opt = -1;
2006 options->rename_limit = -1;
2007 options->context = 3;
2008 options->msg_sep = "";
2009
2010 options->change = diff_change;
2011 options->add_remove = diff_addremove;
2012 if (diff_use_color_default)
2013 DIFF_OPT_SET(options, COLOR_DIFF);
2014 else
2015 DIFF_OPT_CLR(options, COLOR_DIFF);
2016 options->detect_rename = diff_detect_rename_default;
2017 }
2018
2019 int diff_setup_done(struct diff_options *options)
2020 {
2021 int count = 0;
2022
2023 if (options->output_format & DIFF_FORMAT_NAME)
2024 count++;
2025 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2026 count++;
2027 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2028 count++;
2029 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2030 count++;
2031 if (count > 1)
2032 die("--name-only, --name-status, --check and -s are mutually exclusive");
2033
2034 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2035 options->detect_rename = DIFF_DETECT_COPY;
2036
2037 if (options->output_format & (DIFF_FORMAT_NAME |
2038 DIFF_FORMAT_NAME_STATUS |
2039 DIFF_FORMAT_CHECKDIFF |
2040 DIFF_FORMAT_NO_OUTPUT))
2041 options->output_format &= ~(DIFF_FORMAT_RAW |
2042 DIFF_FORMAT_NUMSTAT |
2043 DIFF_FORMAT_DIFFSTAT |
2044 DIFF_FORMAT_SHORTSTAT |
2045 DIFF_FORMAT_SUMMARY |
2046 DIFF_FORMAT_PATCH);
2047
2048 /*
2049 * These cases always need recursive; we do not drop caller-supplied
2050 * recursive bits for other formats here.
2051 */
2052 if (options->output_format & (DIFF_FORMAT_PATCH |
2053 DIFF_FORMAT_NUMSTAT |
2054 DIFF_FORMAT_DIFFSTAT |
2055 DIFF_FORMAT_SHORTSTAT |
2056 DIFF_FORMAT_SUMMARY |
2057 DIFF_FORMAT_CHECKDIFF))
2058 DIFF_OPT_SET(options, RECURSIVE);
2059 /*
2060 * Also pickaxe would not work very well if you do not say recursive
2061 */
2062 if (options->pickaxe)
2063 DIFF_OPT_SET(options, RECURSIVE);
2064
2065 if (options->detect_rename && options->rename_limit < 0)
2066 options->rename_limit = diff_rename_limit_default;
2067 if (options->setup & DIFF_SETUP_USE_CACHE) {
2068 if (!active_cache)
2069 /* read-cache does not die even when it fails
2070 * so it is safe for us to do this here. Also
2071 * it does not smudge active_cache or active_nr
2072 * when it fails, so we do not have to worry about
2073 * cleaning it up ourselves either.
2074 */
2075 read_cache();
2076 }
2077 if (options->abbrev <= 0 || 40 < options->abbrev)
2078 options->abbrev = 40; /* full */
2079
2080 /*
2081 * It does not make sense to show the first hit we happened
2082 * to have found. It does not make sense not to return with
2083 * exit code in such a case either.
2084 */
2085 if (DIFF_OPT_TST(options, QUIET)) {
2086 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2087 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2088 }
2089
2090 /*
2091 * If we postprocess in diffcore, we cannot simply return
2092 * upon the first hit. We need to run diff as usual.
2093 */
2094 if (options->pickaxe || options->filter)
2095 DIFF_OPT_CLR(options, QUIET);
2096
2097 return 0;
2098 }
2099
2100 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2101 {
2102 char c, *eq;
2103 int len;
2104
2105 if (*arg != '-')
2106 return 0;
2107 c = *++arg;
2108 if (!c)
2109 return 0;
2110 if (c == arg_short) {
2111 c = *++arg;
2112 if (!c)
2113 return 1;
2114 if (val && isdigit(c)) {
2115 char *end;
2116 int n = strtoul(arg, &end, 10);
2117 if (*end)
2118 return 0;
2119 *val = n;
2120 return 1;
2121 }
2122 return 0;
2123 }
2124 if (c != '-')
2125 return 0;
2126 arg++;
2127 eq = strchr(arg, '=');
2128 if (eq)
2129 len = eq - arg;
2130 else
2131 len = strlen(arg);
2132 if (!len || strncmp(arg, arg_long, len))
2133 return 0;
2134 if (eq) {
2135 int n;
2136 char *end;
2137 if (!isdigit(*++eq))
2138 return 0;
2139 n = strtoul(eq, &end, 10);
2140 if (*end)
2141 return 0;
2142 *val = n;
2143 }
2144 return 1;
2145 }
2146
2147 static int diff_scoreopt_parse(const char *opt);
2148
2149 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2150 {
2151 const char *arg = av[0];
2152
2153 /* Output format options */
2154 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2155 options->output_format |= DIFF_FORMAT_PATCH;
2156 else if (opt_arg(arg, 'U', "unified", &options->context))
2157 options->output_format |= DIFF_FORMAT_PATCH;
2158 else if (!strcmp(arg, "--raw"))
2159 options->output_format |= DIFF_FORMAT_RAW;
2160 else if (!strcmp(arg, "--patch-with-raw"))
2161 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2162 else if (!strcmp(arg, "--numstat"))
2163 options->output_format |= DIFF_FORMAT_NUMSTAT;
2164 else if (!strcmp(arg, "--shortstat"))
2165 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2166 else if (!strcmp(arg, "--check"))
2167 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2168 else if (!strcmp(arg, "--summary"))
2169 options->output_format |= DIFF_FORMAT_SUMMARY;
2170 else if (!strcmp(arg, "--patch-with-stat"))
2171 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2172 else if (!strcmp(arg, "--name-only"))
2173 options->output_format |= DIFF_FORMAT_NAME;
2174 else if (!strcmp(arg, "--name-status"))
2175 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2176 else if (!strcmp(arg, "-s"))
2177 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2178 else if (!prefixcmp(arg, "--stat")) {
2179 char *end;
2180 int width = options->stat_width;
2181 int name_width = options->stat_name_width;
2182 arg += 6;
2183 end = (char *)arg;
2184
2185 switch (*arg) {
2186 case '-':
2187 if (!prefixcmp(arg, "-width="))
2188 width = strtoul(arg + 7, &end, 10);
2189 else if (!prefixcmp(arg, "-name-width="))
2190 name_width = strtoul(arg + 12, &end, 10);
2191 break;
2192 case '=':
2193 width = strtoul(arg+1, &end, 10);
2194 if (*end == ',')
2195 name_width = strtoul(end+1, &end, 10);
2196 }
2197
2198 /* Important! This checks all the error cases! */
2199 if (*end)
2200 return 0;
2201 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2202 options->stat_name_width = name_width;
2203 options->stat_width = width;
2204 }
2205
2206 /* renames options */
2207 else if (!prefixcmp(arg, "-B")) {
2208 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2209 return -1;
2210 }
2211 else if (!prefixcmp(arg, "-M")) {
2212 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2213 return -1;
2214 options->detect_rename = DIFF_DETECT_RENAME;
2215 }
2216 else if (!prefixcmp(arg, "-C")) {
2217 if (options->detect_rename == DIFF_DETECT_COPY)
2218 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2219 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2220 return -1;
2221 options->detect_rename = DIFF_DETECT_COPY;
2222 }
2223 else if (!strcmp(arg, "--no-renames"))
2224 options->detect_rename = 0;
2225
2226 /* xdiff options */
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
2234 /* flags options */
2235 else if (!strcmp(arg, "--binary")) {
2236 options->output_format |= DIFF_FORMAT_PATCH;
2237 DIFF_OPT_SET(options, BINARY);
2238 }
2239 else if (!strcmp(arg, "--full-index"))
2240 DIFF_OPT_SET(options, FULL_INDEX);
2241 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2242 DIFF_OPT_SET(options, TEXT);
2243 else if (!strcmp(arg, "-R"))
2244 DIFF_OPT_SET(options, REVERSE_DIFF);
2245 else if (!strcmp(arg, "--find-copies-harder"))
2246 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2247 else if (!strcmp(arg, "--follow"))
2248 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2249 else if (!strcmp(arg, "--color"))
2250 DIFF_OPT_SET(options, COLOR_DIFF);
2251 else if (!strcmp(arg, "--no-color"))
2252 DIFF_OPT_CLR(options, COLOR_DIFF);
2253 else if (!strcmp(arg, "--color-words"))
2254 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2255 else if (!strcmp(arg, "--exit-code"))
2256 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2257 else if (!strcmp(arg, "--quiet"))
2258 DIFF_OPT_SET(options, QUIET);
2259 else if (!strcmp(arg, "--ext-diff"))
2260 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2261 else if (!strcmp(arg, "--no-ext-diff"))
2262 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2263
2264 /* misc options */
2265 else if (!strcmp(arg, "-z"))
2266 options->line_termination = 0;
2267 else if (!prefixcmp(arg, "-l"))
2268 options->rename_limit = strtoul(arg+2, NULL, 10);
2269 else if (!prefixcmp(arg, "-S"))
2270 options->pickaxe = arg + 2;
2271 else if (!strcmp(arg, "--pickaxe-all"))
2272 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2273 else if (!strcmp(arg, "--pickaxe-regex"))
2274 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2275 else if (!prefixcmp(arg, "-O"))
2276 options->orderfile = arg + 2;
2277 else if (!prefixcmp(arg, "--diff-filter="))
2278 options->filter = arg + 14;
2279 else if (!strcmp(arg, "--abbrev"))
2280 options->abbrev = DEFAULT_ABBREV;
2281 else if (!prefixcmp(arg, "--abbrev=")) {
2282 options->abbrev = strtoul(arg + 9, NULL, 10);
2283 if (options->abbrev < MINIMUM_ABBREV)
2284 options->abbrev = MINIMUM_ABBREV;
2285 else if (40 < options->abbrev)
2286 options->abbrev = 40;
2287 }
2288 else
2289 return 0;
2290 return 1;
2291 }
2292
2293 static int parse_num(const char **cp_p)
2294 {
2295 unsigned long num, scale;
2296 int ch, dot;
2297 const char *cp = *cp_p;
2298
2299 num = 0;
2300 scale = 1;
2301 dot = 0;
2302 for(;;) {
2303 ch = *cp;
2304 if ( !dot && ch == '.' ) {
2305 scale = 1;
2306 dot = 1;
2307 } else if ( ch == '%' ) {
2308 scale = dot ? scale*100 : 100;
2309 cp++; /* % is always at the end */
2310 break;
2311 } else if ( ch >= '0' && ch <= '9' ) {
2312 if ( scale < 100000 ) {
2313 scale *= 10;
2314 num = (num*10) + (ch-'0');
2315 }
2316 } else {
2317 break;
2318 }
2319 cp++;
2320 }
2321 *cp_p = cp;
2322
2323 /* user says num divided by scale and we say internally that
2324 * is MAX_SCORE * num / scale.
2325 */
2326 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2327 }
2328
2329 static int diff_scoreopt_parse(const char *opt)
2330 {
2331 int opt1, opt2, cmd;
2332
2333 if (*opt++ != '-')
2334 return -1;
2335 cmd = *opt++;
2336 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2337 return -1; /* that is not a -M, -C nor -B option */
2338
2339 opt1 = parse_num(&opt);
2340 if (cmd != 'B')
2341 opt2 = 0;
2342 else {
2343 if (*opt == 0)
2344 opt2 = 0;
2345 else if (*opt != '/')
2346 return -1; /* we expect -B80/99 or -B80 */
2347 else {
2348 opt++;
2349 opt2 = parse_num(&opt);
2350 }
2351 }
2352 if (*opt != 0)
2353 return -1;
2354 return opt1 | (opt2 << 16);
2355 }
2356
2357 struct diff_queue_struct diff_queued_diff;
2358
2359 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2360 {
2361 if (queue->alloc <= queue->nr) {
2362 queue->alloc = alloc_nr(queue->alloc);
2363 queue->queue = xrealloc(queue->queue,
2364 sizeof(dp) * queue->alloc);
2365 }
2366 queue->queue[queue->nr++] = dp;
2367 }
2368
2369 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2370 struct diff_filespec *one,
2371 struct diff_filespec *two)
2372 {
2373 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2374 dp->one = one;
2375 dp->two = two;
2376 if (queue)
2377 diff_q(queue, dp);
2378 return dp;
2379 }
2380
2381 void diff_free_filepair(struct diff_filepair *p)
2382 {
2383 free_filespec(p->one);
2384 free_filespec(p->two);
2385 free(p);
2386 }
2387
2388 /* This is different from find_unique_abbrev() in that
2389 * it stuffs the result with dots for alignment.
2390 */
2391 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2392 {
2393 int abblen;
2394 const char *abbrev;
2395 if (len == 40)
2396 return sha1_to_hex(sha1);
2397
2398 abbrev = find_unique_abbrev(sha1, len);
2399 if (!abbrev)
2400 return sha1_to_hex(sha1);
2401 abblen = strlen(abbrev);
2402 if (abblen < 37) {
2403 static char hex[41];
2404 if (len < abblen && abblen <= len + 2)
2405 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2406 else
2407 sprintf(hex, "%s...", abbrev);
2408 return hex;
2409 }
2410 return sha1_to_hex(sha1);
2411 }
2412
2413 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2414 {
2415 int line_termination = opt->line_termination;
2416 int inter_name_termination = line_termination ? '\t' : '\0';
2417
2418 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2419 printf(":%06o %06o %s ", p->one->mode, p->two->mode,
2420 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2421 printf("%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2422 }
2423 if (p->score) {
2424 printf("%c%03d%c", p->status, similarity_index(p),
2425 inter_name_termination);
2426 } else {
2427 printf("%c%c", p->status, inter_name_termination);
2428 }
2429
2430 if (p->status == DIFF_STATUS_COPIED || p->status == DIFF_STATUS_RENAMED) {
2431 write_name_quoted(p->one->path, stdout, inter_name_termination);
2432 write_name_quoted(p->two->path, stdout, line_termination);
2433 } else {
2434 const char *path = p->one->mode ? p->one->path : p->two->path;
2435 write_name_quoted(path, stdout, line_termination);
2436 }
2437 }
2438
2439 int diff_unmodified_pair(struct diff_filepair *p)
2440 {
2441 /* This function is written stricter than necessary to support
2442 * the currently implemented transformers, but the idea is to
2443 * let transformers to produce diff_filepairs any way they want,
2444 * and filter and clean them up here before producing the output.
2445 */
2446 struct diff_filespec *one = p->one, *two = p->two;
2447
2448 if (DIFF_PAIR_UNMERGED(p))
2449 return 0; /* unmerged is interesting */
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 rename_used %d broken %d\n",
2537 p->score, p->status ? p->status : '?',
2538 p->one->rename_used, 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;
2557 struct diff_filepair *p;
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 /*
2580 * A rename might have re-connected a broken
2581 * pair up, causing the pathnames to be the
2582 * same again. If so, that's not a rename at
2583 * all, just a modification..
2584 *
2585 * Otherwise, see if this source was used for
2586 * multiple renames, in which case we decrement
2587 * the count, and call it a copy.
2588 */
2589 if (!strcmp(p->one->path, p->two->path))
2590 p->status = DIFF_STATUS_MODIFIED;
2591 else if (--p->one->rename_used > 0)
2592 p->status = DIFF_STATUS_COPIED;
2593 else
2594 p->status = DIFF_STATUS_RENAMED;
2595 }
2596 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2597 p->one->mode != p->two->mode ||
2598 is_null_sha1(p->one->sha1))
2599 p->status = DIFF_STATUS_MODIFIED;
2600 else {
2601 /* This is a "no-change" entry and should not
2602 * happen anymore, but prepare for broken callers.
2603 */
2604 error("feeding unmodified %s to diffcore",
2605 p->one->path);
2606 p->status = DIFF_STATUS_UNKNOWN;
2607 }
2608 }
2609 diff_debug_queue("resolve-rename-copy done", q);
2610 }
2611
2612 static int check_pair_status(struct diff_filepair *p)
2613 {
2614 switch (p->status) {
2615 case DIFF_STATUS_UNKNOWN:
2616 return 0;
2617 case 0:
2618 die("internal error in diff-resolve-rename-copy");
2619 default:
2620 return 1;
2621 }
2622 }
2623
2624 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2625 {
2626 int fmt = opt->output_format;
2627
2628 if (fmt & DIFF_FORMAT_CHECKDIFF)
2629 diff_flush_checkdiff(p, opt);
2630 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2631 diff_flush_raw(p, opt);
2632 else if (fmt & DIFF_FORMAT_NAME)
2633 write_name_quoted(p->two->path, stdout, opt->line_termination);
2634 }
2635
2636 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2637 {
2638 if (fs->mode)
2639 printf(" %s mode %06o ", newdelete, fs->mode);
2640 else
2641 printf(" %s ", newdelete);
2642 write_name_quoted(fs->path, stdout, '\n');
2643 }
2644
2645
2646 static void show_mode_change(struct diff_filepair *p, int show_name)
2647 {
2648 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2649 printf(" mode change %06o => %06o%c", p->one->mode, p->two->mode,
2650 show_name ? ' ' : '\n');
2651 if (show_name) {
2652 write_name_quoted(p->two->path, stdout, '\n');
2653 }
2654 }
2655 }
2656
2657 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2658 {
2659 char *names = pprint_rename(p->one->path, p->two->path);
2660
2661 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2662 free(names);
2663 show_mode_change(p, 0);
2664 }
2665
2666 static void diff_summary(struct diff_filepair *p)
2667 {
2668 switch(p->status) {
2669 case DIFF_STATUS_DELETED:
2670 show_file_mode_name("delete", p->one);
2671 break;
2672 case DIFF_STATUS_ADDED:
2673 show_file_mode_name("create", p->two);
2674 break;
2675 case DIFF_STATUS_COPIED:
2676 show_rename_copy("copy", p);
2677 break;
2678 case DIFF_STATUS_RENAMED:
2679 show_rename_copy("rename", p);
2680 break;
2681 default:
2682 if (p->score) {
2683 fputs(" rewrite ", stdout);
2684 write_name_quoted(p->two->path, stdout, ' ');
2685 printf("(%d%%)\n", similarity_index(p));
2686 }
2687 show_mode_change(p, !p->score);
2688 break;
2689 }
2690 }
2691
2692 struct patch_id_t {
2693 struct xdiff_emit_state xm;
2694 SHA_CTX *ctx;
2695 int patchlen;
2696 };
2697
2698 static int remove_space(char *line, int len)
2699 {
2700 int i;
2701 char *dst = line;
2702 unsigned char c;
2703
2704 for (i = 0; i < len; i++)
2705 if (!isspace((c = line[i])))
2706 *dst++ = c;
2707
2708 return dst - line;
2709 }
2710
2711 static void patch_id_consume(void *priv, char *line, unsigned long len)
2712 {
2713 struct patch_id_t *data = priv;
2714 int new_len;
2715
2716 /* Ignore line numbers when computing the SHA1 of the patch */
2717 if (!prefixcmp(line, "@@ -"))
2718 return;
2719
2720 new_len = remove_space(line, len);
2721
2722 SHA1_Update(data->ctx, line, new_len);
2723 data->patchlen += new_len;
2724 }
2725
2726 /* returns 0 upon success, and writes result into sha1 */
2727 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2728 {
2729 struct diff_queue_struct *q = &diff_queued_diff;
2730 int i;
2731 SHA_CTX ctx;
2732 struct patch_id_t data;
2733 char buffer[PATH_MAX * 4 + 20];
2734
2735 SHA1_Init(&ctx);
2736 memset(&data, 0, sizeof(struct patch_id_t));
2737 data.ctx = &ctx;
2738 data.xm.consume = patch_id_consume;
2739
2740 for (i = 0; i < q->nr; i++) {
2741 xpparam_t xpp;
2742 xdemitconf_t xecfg;
2743 xdemitcb_t ecb;
2744 mmfile_t mf1, mf2;
2745 struct diff_filepair *p = q->queue[i];
2746 int len1, len2;
2747
2748 memset(&xecfg, 0, sizeof(xecfg));
2749 if (p->status == 0)
2750 return error("internal diff status error");
2751 if (p->status == DIFF_STATUS_UNKNOWN)
2752 continue;
2753 if (diff_unmodified_pair(p))
2754 continue;
2755 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2756 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2757 continue;
2758 if (DIFF_PAIR_UNMERGED(p))
2759 continue;
2760
2761 diff_fill_sha1_info(p->one);
2762 diff_fill_sha1_info(p->two);
2763 if (fill_mmfile(&mf1, p->one) < 0 ||
2764 fill_mmfile(&mf2, p->two) < 0)
2765 return error("unable to read files to diff");
2766
2767 len1 = remove_space(p->one->path, strlen(p->one->path));
2768 len2 = remove_space(p->two->path, strlen(p->two->path));
2769 if (p->one->mode == 0)
2770 len1 = snprintf(buffer, sizeof(buffer),
2771 "diff--gita/%.*sb/%.*s"
2772 "newfilemode%06o"
2773 "---/dev/null"
2774 "+++b/%.*s",
2775 len1, p->one->path,
2776 len2, p->two->path,
2777 p->two->mode,
2778 len2, p->two->path);
2779 else if (p->two->mode == 0)
2780 len1 = snprintf(buffer, sizeof(buffer),
2781 "diff--gita/%.*sb/%.*s"
2782 "deletedfilemode%06o"
2783 "---a/%.*s"
2784 "+++/dev/null",
2785 len1, p->one->path,
2786 len2, p->two->path,
2787 p->one->mode,
2788 len1, p->one->path);
2789 else
2790 len1 = snprintf(buffer, sizeof(buffer),
2791 "diff--gita/%.*sb/%.*s"
2792 "---a/%.*s"
2793 "+++b/%.*s",
2794 len1, p->one->path,
2795 len2, p->two->path,
2796 len1, p->one->path,
2797 len2, p->two->path);
2798 SHA1_Update(&ctx, buffer, len1);
2799
2800 xpp.flags = XDF_NEED_MINIMAL;
2801 xecfg.ctxlen = 3;
2802 xecfg.flags = XDL_EMIT_FUNCNAMES;
2803 ecb.outf = xdiff_outf;
2804 ecb.priv = &data;
2805 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2806 }
2807
2808 SHA1_Final(sha1, &ctx);
2809 return 0;
2810 }
2811
2812 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2813 {
2814 struct diff_queue_struct *q = &diff_queued_diff;
2815 int i;
2816 int result = diff_get_patch_id(options, sha1);
2817
2818 for (i = 0; i < q->nr; i++)
2819 diff_free_filepair(q->queue[i]);
2820
2821 free(q->queue);
2822 q->queue = NULL;
2823 q->nr = q->alloc = 0;
2824
2825 return result;
2826 }
2827
2828 static int is_summary_empty(const struct diff_queue_struct *q)
2829 {
2830 int i;
2831
2832 for (i = 0; i < q->nr; i++) {
2833 const struct diff_filepair *p = q->queue[i];
2834
2835 switch (p->status) {
2836 case DIFF_STATUS_DELETED:
2837 case DIFF_STATUS_ADDED:
2838 case DIFF_STATUS_COPIED:
2839 case DIFF_STATUS_RENAMED:
2840 return 0;
2841 default:
2842 if (p->score)
2843 return 0;
2844 if (p->one->mode && p->two->mode &&
2845 p->one->mode != p->two->mode)
2846 return 0;
2847 break;
2848 }
2849 }
2850 return 1;
2851 }
2852
2853 void diff_flush(struct diff_options *options)
2854 {
2855 struct diff_queue_struct *q = &diff_queued_diff;
2856 int i, output_format = options->output_format;
2857 int separator = 0;
2858
2859 /*
2860 * Order: raw, stat, summary, patch
2861 * or: name/name-status/checkdiff (other bits clear)
2862 */
2863 if (!q->nr)
2864 goto free_queue;
2865
2866 if (output_format & (DIFF_FORMAT_RAW |
2867 DIFF_FORMAT_NAME |
2868 DIFF_FORMAT_NAME_STATUS |
2869 DIFF_FORMAT_CHECKDIFF)) {
2870 for (i = 0; i < q->nr; i++) {
2871 struct diff_filepair *p = q->queue[i];
2872 if (check_pair_status(p))
2873 flush_one_pair(p, options);
2874 }
2875 separator++;
2876 }
2877
2878 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2879 struct diffstat_t diffstat;
2880
2881 memset(&diffstat, 0, sizeof(struct diffstat_t));
2882 diffstat.xm.consume = diffstat_consume;
2883 for (i = 0; i < q->nr; i++) {
2884 struct diff_filepair *p = q->queue[i];
2885 if (check_pair_status(p))
2886 diff_flush_stat(p, options, &diffstat);
2887 }
2888 if (output_format & DIFF_FORMAT_NUMSTAT)
2889 show_numstat(&diffstat, options);
2890 if (output_format & DIFF_FORMAT_DIFFSTAT)
2891 show_stats(&diffstat, options);
2892 if (output_format & DIFF_FORMAT_SHORTSTAT)
2893 show_shortstats(&diffstat);
2894 free_diffstat_info(&diffstat);
2895 separator++;
2896 }
2897
2898 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2899 for (i = 0; i < q->nr; i++)
2900 diff_summary(q->queue[i]);
2901 separator++;
2902 }
2903
2904 if (output_format & DIFF_FORMAT_PATCH) {
2905 if (separator) {
2906 if (options->stat_sep) {
2907 /* attach patch instead of inline */
2908 fputs(options->stat_sep, stdout);
2909 } else {
2910 putchar(options->line_termination);
2911 }
2912 }
2913
2914 for (i = 0; i < q->nr; i++) {
2915 struct diff_filepair *p = q->queue[i];
2916 if (check_pair_status(p))
2917 diff_flush_patch(p, options);
2918 }
2919 }
2920
2921 if (output_format & DIFF_FORMAT_CALLBACK)
2922 options->format_callback(q, options, options->format_callback_data);
2923
2924 for (i = 0; i < q->nr; i++)
2925 diff_free_filepair(q->queue[i]);
2926 free_queue:
2927 free(q->queue);
2928 q->queue = NULL;
2929 q->nr = q->alloc = 0;
2930 }
2931
2932 static void diffcore_apply_filter(const char *filter)
2933 {
2934 int i;
2935 struct diff_queue_struct *q = &diff_queued_diff;
2936 struct diff_queue_struct outq;
2937 outq.queue = NULL;
2938 outq.nr = outq.alloc = 0;
2939
2940 if (!filter)
2941 return;
2942
2943 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2944 int found;
2945 for (i = found = 0; !found && i < q->nr; i++) {
2946 struct diff_filepair *p = q->queue[i];
2947 if (((p->status == DIFF_STATUS_MODIFIED) &&
2948 ((p->score &&
2949 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2950 (!p->score &&
2951 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2952 ((p->status != DIFF_STATUS_MODIFIED) &&
2953 strchr(filter, p->status)))
2954 found++;
2955 }
2956 if (found)
2957 return;
2958
2959 /* otherwise we will clear the whole queue
2960 * by copying the empty outq at the end of this
2961 * function, but first clear the current entries
2962 * in the queue.
2963 */
2964 for (i = 0; i < q->nr; i++)
2965 diff_free_filepair(q->queue[i]);
2966 }
2967 else {
2968 /* Only the matching ones */
2969 for (i = 0; i < q->nr; i++) {
2970 struct diff_filepair *p = q->queue[i];
2971
2972 if (((p->status == DIFF_STATUS_MODIFIED) &&
2973 ((p->score &&
2974 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2975 (!p->score &&
2976 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2977 ((p->status != DIFF_STATUS_MODIFIED) &&
2978 strchr(filter, p->status)))
2979 diff_q(&outq, p);
2980 else
2981 diff_free_filepair(p);
2982 }
2983 }
2984 free(q->queue);
2985 *q = outq;
2986 }
2987
2988 /* Check whether two filespecs with the same mode and size are identical */
2989 static int diff_filespec_is_identical(struct diff_filespec *one,
2990 struct diff_filespec *two)
2991 {
2992 if (S_ISGITLINK(one->mode)) {
2993 diff_fill_sha1_info(one);
2994 diff_fill_sha1_info(two);
2995 return !hashcmp(one->sha1, two->sha1);
2996 }
2997 if (diff_populate_filespec(one, 0))
2998 return 0;
2999 if (diff_populate_filespec(two, 0))
3000 return 0;
3001 return !memcmp(one->data, two->data, one->size);
3002 }
3003
3004 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3005 {
3006 int i;
3007 struct diff_queue_struct *q = &diff_queued_diff;
3008 struct diff_queue_struct outq;
3009 outq.queue = NULL;
3010 outq.nr = outq.alloc = 0;
3011
3012 for (i = 0; i < q->nr; i++) {
3013 struct diff_filepair *p = q->queue[i];
3014
3015 /*
3016 * 1. Entries that come from stat info dirtyness
3017 * always have both sides (iow, not create/delete),
3018 * one side of the object name is unknown, with
3019 * the same mode and size. Keep the ones that
3020 * do not match these criteria. They have real
3021 * differences.
3022 *
3023 * 2. At this point, the file is known to be modified,
3024 * with the same mode and size, and the object
3025 * name of one side is unknown. Need to inspect
3026 * the identical contents.
3027 */
3028 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3029 !DIFF_FILE_VALID(p->two) ||
3030 (p->one->sha1_valid && p->two->sha1_valid) ||
3031 (p->one->mode != p->two->mode) ||
3032 diff_populate_filespec(p->one, 1) ||
3033 diff_populate_filespec(p->two, 1) ||
3034 (p->one->size != p->two->size) ||
3035 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3036 diff_q(&outq, p);
3037 else {
3038 /*
3039 * The caller can subtract 1 from skip_stat_unmatch
3040 * to determine how many paths were dirty only
3041 * due to stat info mismatch.
3042 */
3043 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3044 diffopt->skip_stat_unmatch++;
3045 diff_free_filepair(p);
3046 }
3047 }
3048 free(q->queue);
3049 *q = outq;
3050 }
3051
3052 void diffcore_std(struct diff_options *options)
3053 {
3054 if (DIFF_OPT_TST(options, QUIET))
3055 return;
3056
3057 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3058 diffcore_skip_stat_unmatch(options);
3059 if (options->break_opt != -1)
3060 diffcore_break(options->break_opt);
3061 if (options->detect_rename)
3062 diffcore_rename(options);
3063 if (options->break_opt != -1)
3064 diffcore_merge_broken();
3065 if (options->pickaxe)
3066 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3067 if (options->orderfile)
3068 diffcore_order(options->orderfile);
3069 diff_resolve_rename_copy();
3070 diffcore_apply_filter(options->filter);
3071
3072 if (diff_queued_diff.nr)
3073 DIFF_OPT_SET(options, HAS_CHANGES);
3074 else
3075 DIFF_OPT_CLR(options, HAS_CHANGES);
3076 }
3077
3078 int diff_result_code(struct diff_options *opt, int status)
3079 {
3080 int result = 0;
3081 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3082 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3083 return status;
3084 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3085 DIFF_OPT_TST(opt, HAS_CHANGES))
3086 result |= 01;
3087 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3088 DIFF_OPT_TST(opt, CHECK_FAILED))
3089 result |= 02;
3090 return result;
3091 }
3092
3093 void diff_addremove(struct diff_options *options,
3094 int addremove, unsigned mode,
3095 const unsigned char *sha1,
3096 const char *base, const char *path)
3097 {
3098 char concatpath[PATH_MAX];
3099 struct diff_filespec *one, *two;
3100
3101 /* This may look odd, but it is a preparation for
3102 * feeding "there are unchanged files which should
3103 * not produce diffs, but when you are doing copy
3104 * detection you would need them, so here they are"
3105 * entries to the diff-core. They will be prefixed
3106 * with something like '=' or '*' (I haven't decided
3107 * which but should not make any difference).
3108 * Feeding the same new and old to diff_change()
3109 * also has the same effect.
3110 * Before the final output happens, they are pruned after
3111 * merged into rename/copy pairs as appropriate.
3112 */
3113 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3114 addremove = (addremove == '+' ? '-' :
3115 addremove == '-' ? '+' : addremove);
3116
3117 if (!path) path = "";
3118 sprintf(concatpath, "%s%s", base, path);
3119 one = alloc_filespec(concatpath);
3120 two = alloc_filespec(concatpath);
3121
3122 if (addremove != '+')
3123 fill_filespec(one, sha1, mode);
3124 if (addremove != '-')
3125 fill_filespec(two, sha1, mode);
3126
3127 diff_queue(&diff_queued_diff, one, two);
3128 DIFF_OPT_SET(options, HAS_CHANGES);
3129 }
3130
3131 void diff_change(struct diff_options *options,
3132 unsigned old_mode, unsigned new_mode,
3133 const unsigned char *old_sha1,
3134 const unsigned char *new_sha1,
3135 const char *base, const char *path)
3136 {
3137 char concatpath[PATH_MAX];
3138 struct diff_filespec *one, *two;
3139
3140 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3141 unsigned tmp;
3142 const unsigned char *tmp_c;
3143 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3144 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3145 }
3146 if (!path) path = "";
3147 sprintf(concatpath, "%s%s", base, path);
3148 one = alloc_filespec(concatpath);
3149 two = alloc_filespec(concatpath);
3150 fill_filespec(one, old_sha1, old_mode);
3151 fill_filespec(two, new_sha1, new_mode);
3152
3153 diff_queue(&diff_queued_diff, one, two);
3154 DIFF_OPT_SET(options, HAS_CHANGES);
3155 }
3156
3157 void diff_unmerge(struct diff_options *options,
3158 const char *path,
3159 unsigned mode, const unsigned char *sha1)
3160 {
3161 struct diff_filespec *one, *two;
3162 one = alloc_filespec(path);
3163 two = alloc_filespec(path);
3164 fill_filespec(one, sha1, mode);
3165 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3166 }