Merge branch 'maint'
[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 #include "utf8.h"
14
15 #ifdef NO_FAST_WORKING_DIRECTORY
16 #define FAST_WORKING_DIRECTORY 0
17 #else
18 #define FAST_WORKING_DIRECTORY 1
19 #endif
20
21 static int diff_detect_rename_default;
22 static int diff_rename_limit_default = 200;
23 static int diff_suppress_blank_empty;
24 int diff_use_color_default = -1;
25 static const char *external_diff_cmd_cfg;
26 int diff_auto_refresh_index = 1;
27 static int diff_mnemonic_prefix;
28
29 static char diff_colors[][COLOR_MAXLEN] = {
30 "\033[m", /* reset */
31 "", /* PLAIN (normal) */
32 "\033[1m", /* METAINFO (bold) */
33 "\033[36m", /* FRAGINFO (cyan) */
34 "\033[31m", /* OLD (red) */
35 "\033[32m", /* NEW (green) */
36 "\033[33m", /* COMMIT (yellow) */
37 "\033[41m", /* WHITESPACE (red background) */
38 };
39
40 static int parse_diff_color_slot(const char *var, int ofs)
41 {
42 if (!strcasecmp(var+ofs, "plain"))
43 return DIFF_PLAIN;
44 if (!strcasecmp(var+ofs, "meta"))
45 return DIFF_METAINFO;
46 if (!strcasecmp(var+ofs, "frag"))
47 return DIFF_FRAGINFO;
48 if (!strcasecmp(var+ofs, "old"))
49 return DIFF_FILE_OLD;
50 if (!strcasecmp(var+ofs, "new"))
51 return DIFF_FILE_NEW;
52 if (!strcasecmp(var+ofs, "commit"))
53 return DIFF_COMMIT;
54 if (!strcasecmp(var+ofs, "whitespace"))
55 return DIFF_WHITESPACE;
56 die("bad config variable '%s'", var);
57 }
58
59 static struct ll_diff_driver {
60 const char *name;
61 struct ll_diff_driver *next;
62 const char *cmd;
63 } *user_diff, **user_diff_tail;
64
65 /*
66 * Currently there is only "diff.<drivername>.command" variable;
67 * because there are "diff.color.<slot>" variables, we are parsing
68 * this in a bit convoluted way to allow low level diff driver
69 * called "color".
70 */
71 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
72 {
73 const char *name;
74 int namelen;
75 struct ll_diff_driver *drv;
76
77 name = var + 5;
78 namelen = ep - name;
79 for (drv = user_diff; drv; drv = drv->next)
80 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
81 break;
82 if (!drv) {
83 drv = xcalloc(1, sizeof(struct ll_diff_driver));
84 drv->name = xmemdupz(name, namelen);
85 if (!user_diff_tail)
86 user_diff_tail = &user_diff;
87 *user_diff_tail = drv;
88 user_diff_tail = &(drv->next);
89 }
90
91 return git_config_string(&(drv->cmd), var, value);
92 }
93
94 /*
95 * 'diff.<what>.funcname' attribute can be specified in the configuration
96 * to define a customized regexp to find the beginning of a function to
97 * be used for hunk header lines of "diff -p" style output.
98 */
99 static struct funcname_pattern {
100 char *name;
101 char *pattern;
102 struct funcname_pattern *next;
103 } *funcname_pattern_list;
104
105 static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
106 {
107 const char *name;
108 int namelen;
109 struct funcname_pattern *pp;
110
111 name = var + 5; /* "diff." */
112 namelen = ep - name;
113
114 for (pp = funcname_pattern_list; pp; pp = pp->next)
115 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
116 break;
117 if (!pp) {
118 pp = xcalloc(1, sizeof(*pp));
119 pp->name = xmemdupz(name, namelen);
120 pp->next = funcname_pattern_list;
121 funcname_pattern_list = pp;
122 }
123 free(pp->pattern);
124 pp->pattern = xstrdup(value);
125 return 0;
126 }
127
128 /*
129 * These are to give UI layer defaults.
130 * The core-level commands such as git-diff-files should
131 * never be affected by the setting of diff.renames
132 * the user happens to have in the configuration file.
133 */
134 int git_diff_ui_config(const char *var, const char *value, void *cb)
135 {
136 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
137 diff_use_color_default = git_config_colorbool(var, value, -1);
138 return 0;
139 }
140 if (!strcmp(var, "diff.renames")) {
141 if (!value)
142 diff_detect_rename_default = DIFF_DETECT_RENAME;
143 else if (!strcasecmp(value, "copies") ||
144 !strcasecmp(value, "copy"))
145 diff_detect_rename_default = DIFF_DETECT_COPY;
146 else if (git_config_bool(var,value))
147 diff_detect_rename_default = DIFF_DETECT_RENAME;
148 return 0;
149 }
150 if (!strcmp(var, "diff.autorefreshindex")) {
151 diff_auto_refresh_index = git_config_bool(var, value);
152 return 0;
153 }
154 if (!strcmp(var, "diff.mnemonicprefix")) {
155 diff_mnemonic_prefix = git_config_bool(var, value);
156 return 0;
157 }
158 if (!strcmp(var, "diff.external"))
159 return git_config_string(&external_diff_cmd_cfg, var, value);
160 if (!prefixcmp(var, "diff.")) {
161 const char *ep = strrchr(var, '.');
162
163 if (ep != var + 4 && !strcmp(ep, ".command"))
164 return parse_lldiff_command(var, ep, value);
165 }
166
167 return git_diff_basic_config(var, value, cb);
168 }
169
170 int git_diff_basic_config(const char *var, const char *value, void *cb)
171 {
172 if (!strcmp(var, "diff.renamelimit")) {
173 diff_rename_limit_default = git_config_int(var, value);
174 return 0;
175 }
176
177 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
178 int slot = parse_diff_color_slot(var, 11);
179 if (!value)
180 return config_error_nonbool(var);
181 color_parse(value, var, diff_colors[slot]);
182 return 0;
183 }
184
185 /* like GNU diff's --suppress-blank-empty option */
186 if (!strcmp(var, "diff.suppress-blank-empty")) {
187 diff_suppress_blank_empty = git_config_bool(var, value);
188 return 0;
189 }
190
191 if (!prefixcmp(var, "diff.")) {
192 const char *ep = strrchr(var, '.');
193 if (ep != var + 4) {
194 if (!strcmp(ep, ".funcname")) {
195 if (!value)
196 return config_error_nonbool(var);
197 return parse_funcname_pattern(var, ep, value);
198 }
199 }
200 }
201
202 return git_color_default_config(var, value, cb);
203 }
204
205 static char *quote_two(const char *one, const char *two)
206 {
207 int need_one = quote_c_style(one, NULL, NULL, 1);
208 int need_two = quote_c_style(two, NULL, NULL, 1);
209 struct strbuf res;
210
211 strbuf_init(&res, 0);
212 if (need_one + need_two) {
213 strbuf_addch(&res, '"');
214 quote_c_style(one, &res, NULL, 1);
215 quote_c_style(two, &res, NULL, 1);
216 strbuf_addch(&res, '"');
217 } else {
218 strbuf_addstr(&res, one);
219 strbuf_addstr(&res, two);
220 }
221 return strbuf_detach(&res, NULL);
222 }
223
224 static const char *external_diff(void)
225 {
226 static const char *external_diff_cmd = NULL;
227 static int done_preparing = 0;
228
229 if (done_preparing)
230 return external_diff_cmd;
231 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
232 if (!external_diff_cmd)
233 external_diff_cmd = external_diff_cmd_cfg;
234 done_preparing = 1;
235 return external_diff_cmd;
236 }
237
238 static struct diff_tempfile {
239 const char *name; /* filename external diff should read from */
240 char hex[41];
241 char mode[10];
242 char tmp_path[PATH_MAX];
243 } diff_temp[2];
244
245 static int count_lines(const char *data, int size)
246 {
247 int count, ch, completely_empty = 1, nl_just_seen = 0;
248 count = 0;
249 while (0 < size--) {
250 ch = *data++;
251 if (ch == '\n') {
252 count++;
253 nl_just_seen = 1;
254 completely_empty = 0;
255 }
256 else {
257 nl_just_seen = 0;
258 completely_empty = 0;
259 }
260 }
261 if (completely_empty)
262 return 0;
263 if (!nl_just_seen)
264 count++; /* no trailing newline */
265 return count;
266 }
267
268 static void print_line_count(FILE *file, int count)
269 {
270 switch (count) {
271 case 0:
272 fprintf(file, "0,0");
273 break;
274 case 1:
275 fprintf(file, "1");
276 break;
277 default:
278 fprintf(file, "1,%d", count);
279 break;
280 }
281 }
282
283 static void copy_file_with_prefix(FILE *file,
284 int prefix, const char *data, int size,
285 const char *set, const char *reset)
286 {
287 int ch, nl_just_seen = 1;
288 while (0 < size--) {
289 ch = *data++;
290 if (nl_just_seen) {
291 fputs(set, file);
292 putc(prefix, file);
293 }
294 if (ch == '\n') {
295 nl_just_seen = 1;
296 fputs(reset, file);
297 } else
298 nl_just_seen = 0;
299 putc(ch, file);
300 }
301 if (!nl_just_seen)
302 fprintf(file, "%s\n\\ No newline at end of file\n", reset);
303 }
304
305 static void emit_rewrite_diff(const char *name_a,
306 const char *name_b,
307 struct diff_filespec *one,
308 struct diff_filespec *two,
309 struct diff_options *o)
310 {
311 int lc_a, lc_b;
312 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
313 const char *name_a_tab, *name_b_tab;
314 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
315 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
316 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
317 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
318 const char *reset = diff_get_color(color_diff, DIFF_RESET);
319 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
320 const char *a_prefix, *b_prefix;
321
322 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
323 a_prefix = o->b_prefix;
324 b_prefix = o->a_prefix;
325 } else {
326 a_prefix = o->a_prefix;
327 b_prefix = o->b_prefix;
328 }
329
330 name_a += (*name_a == '/');
331 name_b += (*name_b == '/');
332 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
333 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
334
335 strbuf_reset(&a_name);
336 strbuf_reset(&b_name);
337 quote_two_c_style(&a_name, a_prefix, name_a, 0);
338 quote_two_c_style(&b_name, b_prefix, name_b, 0);
339
340 diff_populate_filespec(one, 0);
341 diff_populate_filespec(two, 0);
342 lc_a = count_lines(one->data, one->size);
343 lc_b = count_lines(two->data, two->size);
344 fprintf(o->file,
345 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
346 metainfo, a_name.buf, name_a_tab, reset,
347 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
348 print_line_count(o->file, lc_a);
349 fprintf(o->file, " +");
350 print_line_count(o->file, lc_b);
351 fprintf(o->file, " @@%s\n", reset);
352 if (lc_a)
353 copy_file_with_prefix(o->file, '-', one->data, one->size, old, reset);
354 if (lc_b)
355 copy_file_with_prefix(o->file, '+', two->data, two->size, new, reset);
356 }
357
358 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
359 {
360 if (!DIFF_FILE_VALID(one)) {
361 mf->ptr = (char *)""; /* does not matter */
362 mf->size = 0;
363 return 0;
364 }
365 else if (diff_populate_filespec(one, 0))
366 return -1;
367 mf->ptr = one->data;
368 mf->size = one->size;
369 return 0;
370 }
371
372 struct diff_words_buffer {
373 mmfile_t text;
374 long alloc;
375 long current; /* output pointer */
376 int suppressed_newline;
377 };
378
379 static void diff_words_append(char *line, unsigned long len,
380 struct diff_words_buffer *buffer)
381 {
382 if (buffer->text.size + len > buffer->alloc) {
383 buffer->alloc = (buffer->text.size + len) * 3 / 2;
384 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
385 }
386 line++;
387 len--;
388 memcpy(buffer->text.ptr + buffer->text.size, line, len);
389 buffer->text.size += len;
390 }
391
392 struct diff_words_data {
393 struct diff_words_buffer minus, plus;
394 FILE *file;
395 };
396
397 static void print_word(FILE *file, struct diff_words_buffer *buffer, int len, int color,
398 int suppress_newline)
399 {
400 const char *ptr;
401 int eol = 0;
402
403 if (len == 0)
404 return;
405
406 ptr = buffer->text.ptr + buffer->current;
407 buffer->current += len;
408
409 if (ptr[len - 1] == '\n') {
410 eol = 1;
411 len--;
412 }
413
414 fputs(diff_get_color(1, color), file);
415 fwrite(ptr, len, 1, file);
416 fputs(diff_get_color(1, DIFF_RESET), file);
417
418 if (eol) {
419 if (suppress_newline)
420 buffer->suppressed_newline = 1;
421 else
422 putc('\n', file);
423 }
424 }
425
426 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
427 {
428 struct diff_words_data *diff_words = priv;
429
430 if (diff_words->minus.suppressed_newline) {
431 if (line[0] != '+')
432 putc('\n', diff_words->file);
433 diff_words->minus.suppressed_newline = 0;
434 }
435
436 len--;
437 switch (line[0]) {
438 case '-':
439 print_word(diff_words->file,
440 &diff_words->minus, len, DIFF_FILE_OLD, 1);
441 break;
442 case '+':
443 print_word(diff_words->file,
444 &diff_words->plus, len, DIFF_FILE_NEW, 0);
445 break;
446 case ' ':
447 print_word(diff_words->file,
448 &diff_words->plus, len, DIFF_PLAIN, 0);
449 diff_words->minus.current += len;
450 break;
451 }
452 }
453
454 /* this executes the word diff on the accumulated buffers */
455 static void diff_words_show(struct diff_words_data *diff_words)
456 {
457 xpparam_t xpp;
458 xdemitconf_t xecfg;
459 xdemitcb_t ecb;
460 mmfile_t minus, plus;
461 int i;
462
463 memset(&xecfg, 0, sizeof(xecfg));
464 minus.size = diff_words->minus.text.size;
465 minus.ptr = xmalloc(minus.size);
466 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
467 for (i = 0; i < minus.size; i++)
468 if (isspace(minus.ptr[i]))
469 minus.ptr[i] = '\n';
470 diff_words->minus.current = 0;
471
472 plus.size = diff_words->plus.text.size;
473 plus.ptr = xmalloc(plus.size);
474 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
475 for (i = 0; i < plus.size; i++)
476 if (isspace(plus.ptr[i]))
477 plus.ptr[i] = '\n';
478 diff_words->plus.current = 0;
479
480 xpp.flags = XDF_NEED_MINIMAL;
481 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
482 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
483 &xpp, &xecfg, &ecb);
484 free(minus.ptr);
485 free(plus.ptr);
486 diff_words->minus.text.size = diff_words->plus.text.size = 0;
487
488 if (diff_words->minus.suppressed_newline) {
489 putc('\n', diff_words->file);
490 diff_words->minus.suppressed_newline = 0;
491 }
492 }
493
494 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
495
496 struct emit_callback {
497 int nparents, color_diff;
498 unsigned ws_rule;
499 sane_truncate_fn truncate;
500 const char **label_path;
501 struct diff_words_data *diff_words;
502 int *found_changesp;
503 FILE *file;
504 };
505
506 static void free_diff_words_data(struct emit_callback *ecbdata)
507 {
508 if (ecbdata->diff_words) {
509 /* flush buffers */
510 if (ecbdata->diff_words->minus.text.size ||
511 ecbdata->diff_words->plus.text.size)
512 diff_words_show(ecbdata->diff_words);
513
514 free (ecbdata->diff_words->minus.text.ptr);
515 free (ecbdata->diff_words->plus.text.ptr);
516 free(ecbdata->diff_words);
517 ecbdata->diff_words = NULL;
518 }
519 }
520
521 const char *diff_get_color(int diff_use_color, enum color_diff ix)
522 {
523 if (diff_use_color)
524 return diff_colors[ix];
525 return "";
526 }
527
528 static void emit_line(FILE *file, const char *set, const char *reset, const char *line, int len)
529 {
530 int has_trailing_newline, has_trailing_carriage_return;
531
532 has_trailing_newline = (len > 0 && line[len-1] == '\n');
533 if (has_trailing_newline)
534 len--;
535 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
536 if (has_trailing_carriage_return)
537 len--;
538
539 fputs(set, file);
540 fwrite(line, len, 1, file);
541 fputs(reset, file);
542 if (has_trailing_carriage_return)
543 fputc('\r', file);
544 if (has_trailing_newline)
545 fputc('\n', file);
546 }
547
548 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
549 {
550 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
551 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
552
553 if (!*ws)
554 emit_line(ecbdata->file, set, reset, line, len);
555 else {
556 /* Emit just the prefix, then the rest. */
557 emit_line(ecbdata->file, set, reset, line, ecbdata->nparents);
558 ws_check_emit(line + ecbdata->nparents,
559 len - ecbdata->nparents, ecbdata->ws_rule,
560 ecbdata->file, set, reset, ws);
561 }
562 }
563
564 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
565 {
566 const char *cp;
567 unsigned long allot;
568 size_t l = len;
569
570 if (ecb->truncate)
571 return ecb->truncate(line, len);
572 cp = line;
573 allot = l;
574 while (0 < l) {
575 (void) utf8_width(&cp, &l);
576 if (!cp)
577 break; /* truncated in the middle? */
578 }
579 return allot - l;
580 }
581
582 static void fn_out_consume(void *priv, char *line, unsigned long len)
583 {
584 int i;
585 int color;
586 struct emit_callback *ecbdata = priv;
587 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
588 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
589 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
590
591 *(ecbdata->found_changesp) = 1;
592
593 if (ecbdata->label_path[0]) {
594 const char *name_a_tab, *name_b_tab;
595
596 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
597 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
598
599 fprintf(ecbdata->file, "%s--- %s%s%s\n",
600 meta, ecbdata->label_path[0], reset, name_a_tab);
601 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
602 meta, ecbdata->label_path[1], reset, name_b_tab);
603 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
604 }
605
606 if (diff_suppress_blank_empty
607 && len == 2 && line[0] == ' ' && line[1] == '\n') {
608 line[0] = '\n';
609 len = 1;
610 }
611
612 /* This is not really necessary for now because
613 * this codepath only deals with two-way diffs.
614 */
615 for (i = 0; i < len && line[i] == '@'; i++)
616 ;
617 if (2 <= i && i < len && line[i] == ' ') {
618 ecbdata->nparents = i - 1;
619 len = sane_truncate_line(ecbdata, line, len);
620 emit_line(ecbdata->file,
621 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
622 reset, line, len);
623 if (line[len-1] != '\n')
624 putc('\n', ecbdata->file);
625 return;
626 }
627
628 if (len < ecbdata->nparents) {
629 emit_line(ecbdata->file, reset, reset, line, len);
630 return;
631 }
632
633 color = DIFF_PLAIN;
634 if (ecbdata->diff_words && ecbdata->nparents != 1)
635 /* fall back to normal diff */
636 free_diff_words_data(ecbdata);
637 if (ecbdata->diff_words) {
638 if (line[0] == '-') {
639 diff_words_append(line, len,
640 &ecbdata->diff_words->minus);
641 return;
642 } else if (line[0] == '+') {
643 diff_words_append(line, len,
644 &ecbdata->diff_words->plus);
645 return;
646 }
647 if (ecbdata->diff_words->minus.text.size ||
648 ecbdata->diff_words->plus.text.size)
649 diff_words_show(ecbdata->diff_words);
650 line++;
651 len--;
652 emit_line(ecbdata->file, plain, reset, line, len);
653 return;
654 }
655 for (i = 0; i < ecbdata->nparents && len; i++) {
656 if (line[i] == '-')
657 color = DIFF_FILE_OLD;
658 else if (line[i] == '+')
659 color = DIFF_FILE_NEW;
660 }
661
662 if (color != DIFF_FILE_NEW) {
663 emit_line(ecbdata->file,
664 diff_get_color(ecbdata->color_diff, color),
665 reset, line, len);
666 return;
667 }
668 emit_add_line(reset, ecbdata, line, len);
669 }
670
671 static char *pprint_rename(const char *a, const char *b)
672 {
673 const char *old = a;
674 const char *new = b;
675 struct strbuf name;
676 int pfx_length, sfx_length;
677 int len_a = strlen(a);
678 int len_b = strlen(b);
679 int a_midlen, b_midlen;
680 int qlen_a = quote_c_style(a, NULL, NULL, 0);
681 int qlen_b = quote_c_style(b, NULL, NULL, 0);
682
683 strbuf_init(&name, 0);
684 if (qlen_a || qlen_b) {
685 quote_c_style(a, &name, NULL, 0);
686 strbuf_addstr(&name, " => ");
687 quote_c_style(b, &name, NULL, 0);
688 return strbuf_detach(&name, NULL);
689 }
690
691 /* Find common prefix */
692 pfx_length = 0;
693 while (*old && *new && *old == *new) {
694 if (*old == '/')
695 pfx_length = old - a + 1;
696 old++;
697 new++;
698 }
699
700 /* Find common suffix */
701 old = a + len_a;
702 new = b + len_b;
703 sfx_length = 0;
704 while (a <= old && b <= new && *old == *new) {
705 if (*old == '/')
706 sfx_length = len_a - (old - a);
707 old--;
708 new--;
709 }
710
711 /*
712 * pfx{mid-a => mid-b}sfx
713 * {pfx-a => pfx-b}sfx
714 * pfx{sfx-a => sfx-b}
715 * name-a => name-b
716 */
717 a_midlen = len_a - pfx_length - sfx_length;
718 b_midlen = len_b - pfx_length - sfx_length;
719 if (a_midlen < 0)
720 a_midlen = 0;
721 if (b_midlen < 0)
722 b_midlen = 0;
723
724 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
725 if (pfx_length + sfx_length) {
726 strbuf_add(&name, a, pfx_length);
727 strbuf_addch(&name, '{');
728 }
729 strbuf_add(&name, a + pfx_length, a_midlen);
730 strbuf_addstr(&name, " => ");
731 strbuf_add(&name, b + pfx_length, b_midlen);
732 if (pfx_length + sfx_length) {
733 strbuf_addch(&name, '}');
734 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
735 }
736 return strbuf_detach(&name, NULL);
737 }
738
739 struct diffstat_t {
740 int nr;
741 int alloc;
742 struct diffstat_file {
743 char *from_name;
744 char *name;
745 char *print_name;
746 unsigned is_unmerged:1;
747 unsigned is_binary:1;
748 unsigned is_renamed:1;
749 unsigned int added, deleted;
750 } **files;
751 };
752
753 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
754 const char *name_a,
755 const char *name_b)
756 {
757 struct diffstat_file *x;
758 x = xcalloc(sizeof (*x), 1);
759 if (diffstat->nr == diffstat->alloc) {
760 diffstat->alloc = alloc_nr(diffstat->alloc);
761 diffstat->files = xrealloc(diffstat->files,
762 diffstat->alloc * sizeof(x));
763 }
764 diffstat->files[diffstat->nr++] = x;
765 if (name_b) {
766 x->from_name = xstrdup(name_a);
767 x->name = xstrdup(name_b);
768 x->is_renamed = 1;
769 }
770 else {
771 x->from_name = NULL;
772 x->name = xstrdup(name_a);
773 }
774 return x;
775 }
776
777 static void diffstat_consume(void *priv, char *line, unsigned long len)
778 {
779 struct diffstat_t *diffstat = priv;
780 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
781
782 if (line[0] == '+')
783 x->added++;
784 else if (line[0] == '-')
785 x->deleted++;
786 }
787
788 const char mime_boundary_leader[] = "------------";
789
790 static int scale_linear(int it, int width, int max_change)
791 {
792 /*
793 * make sure that at least one '-' is printed if there were deletions,
794 * and likewise for '+'.
795 */
796 if (max_change < 2)
797 return it;
798 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
799 }
800
801 static void show_name(FILE *file,
802 const char *prefix, const char *name, int len,
803 const char *reset, const char *set)
804 {
805 fprintf(file, " %s%s%-*s%s |", set, prefix, len, name, reset);
806 }
807
808 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
809 {
810 if (cnt <= 0)
811 return;
812 fprintf(file, "%s", set);
813 while (cnt--)
814 putc(ch, file);
815 fprintf(file, "%s", reset);
816 }
817
818 static void fill_print_name(struct diffstat_file *file)
819 {
820 char *pname;
821
822 if (file->print_name)
823 return;
824
825 if (!file->is_renamed) {
826 struct strbuf buf;
827 strbuf_init(&buf, 0);
828 if (quote_c_style(file->name, &buf, NULL, 0)) {
829 pname = strbuf_detach(&buf, NULL);
830 } else {
831 pname = file->name;
832 strbuf_release(&buf);
833 }
834 } else {
835 pname = pprint_rename(file->from_name, file->name);
836 }
837 file->print_name = pname;
838 }
839
840 static void show_stats(struct diffstat_t* data, struct diff_options *options)
841 {
842 int i, len, add, del, total, adds = 0, dels = 0;
843 int max_change = 0, max_len = 0;
844 int total_files = data->nr;
845 int width, name_width;
846 const char *reset, *set, *add_c, *del_c;
847
848 if (data->nr == 0)
849 return;
850
851 width = options->stat_width ? options->stat_width : 80;
852 name_width = options->stat_name_width ? options->stat_name_width : 50;
853
854 /* Sanity: give at least 5 columns to the graph,
855 * but leave at least 10 columns for the name.
856 */
857 if (width < 25)
858 width = 25;
859 if (name_width < 10)
860 name_width = 10;
861 else if (width < name_width + 15)
862 name_width = width - 15;
863
864 /* Find the longest filename and max number of changes */
865 reset = diff_get_color_opt(options, DIFF_RESET);
866 set = diff_get_color_opt(options, DIFF_PLAIN);
867 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
868 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
869
870 for (i = 0; i < data->nr; i++) {
871 struct diffstat_file *file = data->files[i];
872 int change = file->added + file->deleted;
873 fill_print_name(file);
874 len = strlen(file->print_name);
875 if (max_len < len)
876 max_len = len;
877
878 if (file->is_binary || file->is_unmerged)
879 continue;
880 if (max_change < change)
881 max_change = change;
882 }
883
884 /* Compute the width of the graph part;
885 * 10 is for one blank at the beginning of the line plus
886 * " | count " between the name and the graph.
887 *
888 * From here on, name_width is the width of the name area,
889 * and width is the width of the graph area.
890 */
891 name_width = (name_width < max_len) ? name_width : max_len;
892 if (width < (name_width + 10) + max_change)
893 width = width - (name_width + 10);
894 else
895 width = max_change;
896
897 for (i = 0; i < data->nr; i++) {
898 const char *prefix = "";
899 char *name = data->files[i]->print_name;
900 int added = data->files[i]->added;
901 int deleted = data->files[i]->deleted;
902 int name_len;
903
904 /*
905 * "scale" the filename
906 */
907 len = name_width;
908 name_len = strlen(name);
909 if (name_width < name_len) {
910 char *slash;
911 prefix = "...";
912 len -= 3;
913 name += name_len - len;
914 slash = strchr(name, '/');
915 if (slash)
916 name = slash;
917 }
918
919 if (data->files[i]->is_binary) {
920 show_name(options->file, prefix, name, len, reset, set);
921 fprintf(options->file, " Bin ");
922 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
923 fprintf(options->file, " -> ");
924 fprintf(options->file, "%s%d%s", add_c, added, reset);
925 fprintf(options->file, " bytes");
926 fprintf(options->file, "\n");
927 continue;
928 }
929 else if (data->files[i]->is_unmerged) {
930 show_name(options->file, prefix, name, len, reset, set);
931 fprintf(options->file, " Unmerged\n");
932 continue;
933 }
934 else if (!data->files[i]->is_renamed &&
935 (added + deleted == 0)) {
936 total_files--;
937 continue;
938 }
939
940 /*
941 * scale the add/delete
942 */
943 add = added;
944 del = deleted;
945 total = add + del;
946 adds += add;
947 dels += del;
948
949 if (width <= max_change) {
950 add = scale_linear(add, width, max_change);
951 del = scale_linear(del, width, max_change);
952 total = add + del;
953 }
954 show_name(options->file, prefix, name, len, reset, set);
955 fprintf(options->file, "%5d%s", added + deleted,
956 added + deleted ? " " : "");
957 show_graph(options->file, '+', add, add_c, reset);
958 show_graph(options->file, '-', del, del_c, reset);
959 fprintf(options->file, "\n");
960 }
961 fprintf(options->file,
962 "%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
963 set, total_files, adds, dels, reset);
964 }
965
966 static void show_shortstats(struct diffstat_t* data, struct diff_options *options)
967 {
968 int i, adds = 0, dels = 0, total_files = data->nr;
969
970 if (data->nr == 0)
971 return;
972
973 for (i = 0; i < data->nr; i++) {
974 if (!data->files[i]->is_binary &&
975 !data->files[i]->is_unmerged) {
976 int added = data->files[i]->added;
977 int deleted= data->files[i]->deleted;
978 if (!data->files[i]->is_renamed &&
979 (added + deleted == 0)) {
980 total_files--;
981 } else {
982 adds += added;
983 dels += deleted;
984 }
985 }
986 }
987 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
988 total_files, adds, dels);
989 }
990
991 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
992 {
993 int i;
994
995 if (data->nr == 0)
996 return;
997
998 for (i = 0; i < data->nr; i++) {
999 struct diffstat_file *file = data->files[i];
1000
1001 if (file->is_binary)
1002 fprintf(options->file, "-\t-\t");
1003 else
1004 fprintf(options->file,
1005 "%d\t%d\t", file->added, file->deleted);
1006 if (options->line_termination) {
1007 fill_print_name(file);
1008 if (!file->is_renamed)
1009 write_name_quoted(file->name, options->file,
1010 options->line_termination);
1011 else {
1012 fputs(file->print_name, options->file);
1013 putc(options->line_termination, options->file);
1014 }
1015 } else {
1016 if (file->is_renamed) {
1017 putc('\0', options->file);
1018 write_name_quoted(file->from_name, options->file, '\0');
1019 }
1020 write_name_quoted(file->name, options->file, '\0');
1021 }
1022 }
1023 }
1024
1025 struct dirstat_file {
1026 const char *name;
1027 unsigned long changed;
1028 };
1029
1030 struct dirstat_dir {
1031 struct dirstat_file *files;
1032 int alloc, nr, percent, cumulative;
1033 };
1034
1035 static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
1036 {
1037 unsigned long this_dir = 0;
1038 unsigned int sources = 0;
1039
1040 while (dir->nr) {
1041 struct dirstat_file *f = dir->files;
1042 int namelen = strlen(f->name);
1043 unsigned long this;
1044 char *slash;
1045
1046 if (namelen < baselen)
1047 break;
1048 if (memcmp(f->name, base, baselen))
1049 break;
1050 slash = strchr(f->name + baselen, '/');
1051 if (slash) {
1052 int newbaselen = slash + 1 - f->name;
1053 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
1054 sources++;
1055 } else {
1056 this = f->changed;
1057 dir->files++;
1058 dir->nr--;
1059 sources += 2;
1060 }
1061 this_dir += this;
1062 }
1063
1064 /*
1065 * We don't report dirstat's for
1066 * - the top level
1067 * - or cases where everything came from a single directory
1068 * under this directory (sources == 1).
1069 */
1070 if (baselen && sources != 1) {
1071 int permille = this_dir * 1000 / changed;
1072 if (permille) {
1073 int percent = permille / 10;
1074 if (percent >= dir->percent) {
1075 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1076 if (!dir->cumulative)
1077 return 0;
1078 }
1079 }
1080 }
1081 return this_dir;
1082 }
1083
1084 static int dirstat_compare(const void *_a, const void *_b)
1085 {
1086 const struct dirstat_file *a = _a;
1087 const struct dirstat_file *b = _b;
1088 return strcmp(a->name, b->name);
1089 }
1090
1091 static void show_dirstat(struct diff_options *options)
1092 {
1093 int i;
1094 unsigned long changed;
1095 struct dirstat_dir dir;
1096 struct diff_queue_struct *q = &diff_queued_diff;
1097
1098 dir.files = NULL;
1099 dir.alloc = 0;
1100 dir.nr = 0;
1101 dir.percent = options->dirstat_percent;
1102 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1103
1104 changed = 0;
1105 for (i = 0; i < q->nr; i++) {
1106 struct diff_filepair *p = q->queue[i];
1107 const char *name;
1108 unsigned long copied, added, damage;
1109
1110 name = p->one->path ? p->one->path : p->two->path;
1111
1112 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1113 diff_populate_filespec(p->one, 0);
1114 diff_populate_filespec(p->two, 0);
1115 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1116 &copied, &added);
1117 diff_free_filespec_data(p->one);
1118 diff_free_filespec_data(p->two);
1119 } else if (DIFF_FILE_VALID(p->one)) {
1120 diff_populate_filespec(p->one, 1);
1121 copied = added = 0;
1122 diff_free_filespec_data(p->one);
1123 } else if (DIFF_FILE_VALID(p->two)) {
1124 diff_populate_filespec(p->two, 1);
1125 copied = 0;
1126 added = p->two->size;
1127 diff_free_filespec_data(p->two);
1128 } else
1129 continue;
1130
1131 /*
1132 * Original minus copied is the removed material,
1133 * added is the new material. They are both damages
1134 * made to the preimage.
1135 */
1136 damage = (p->one->size - copied) + added;
1137
1138 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1139 dir.files[dir.nr].name = name;
1140 dir.files[dir.nr].changed = damage;
1141 changed += damage;
1142 dir.nr++;
1143 }
1144
1145 /* This can happen even with many files, if everything was renames */
1146 if (!changed)
1147 return;
1148
1149 /* Show all directories with more than x% of the changes */
1150 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1151 gather_dirstat(options->file, &dir, changed, "", 0);
1152 }
1153
1154 static void free_diffstat_info(struct diffstat_t *diffstat)
1155 {
1156 int i;
1157 for (i = 0; i < diffstat->nr; i++) {
1158 struct diffstat_file *f = diffstat->files[i];
1159 if (f->name != f->print_name)
1160 free(f->print_name);
1161 free(f->name);
1162 free(f->from_name);
1163 free(f);
1164 }
1165 free(diffstat->files);
1166 }
1167
1168 struct checkdiff_t {
1169 const char *filename;
1170 int lineno;
1171 struct diff_options *o;
1172 unsigned ws_rule;
1173 unsigned status;
1174 int trailing_blanks_start;
1175 };
1176
1177 static int is_conflict_marker(const char *line, unsigned long len)
1178 {
1179 char firstchar;
1180 int cnt;
1181
1182 if (len < 8)
1183 return 0;
1184 firstchar = line[0];
1185 switch (firstchar) {
1186 case '=': case '>': case '<':
1187 break;
1188 default:
1189 return 0;
1190 }
1191 for (cnt = 1; cnt < 7; cnt++)
1192 if (line[cnt] != firstchar)
1193 return 0;
1194 /* line[0] thru line[6] are same as firstchar */
1195 if (firstchar == '=') {
1196 /* divider between ours and theirs? */
1197 if (len != 8 || line[7] != '\n')
1198 return 0;
1199 } else if (len < 8 || !isspace(line[7])) {
1200 /* not divider before ours nor after theirs */
1201 return 0;
1202 }
1203 return 1;
1204 }
1205
1206 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1207 {
1208 struct checkdiff_t *data = priv;
1209 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1210 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1211 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1212 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1213 char *err;
1214
1215 if (line[0] == '+') {
1216 unsigned bad;
1217 data->lineno++;
1218 if (!ws_blank_line(line + 1, len - 1, data->ws_rule))
1219 data->trailing_blanks_start = 0;
1220 else if (!data->trailing_blanks_start)
1221 data->trailing_blanks_start = data->lineno;
1222 if (is_conflict_marker(line + 1, len - 1)) {
1223 data->status |= 1;
1224 fprintf(data->o->file,
1225 "%s:%d: leftover conflict marker\n",
1226 data->filename, data->lineno);
1227 }
1228 bad = ws_check(line + 1, len - 1, data->ws_rule);
1229 if (!bad)
1230 return;
1231 data->status |= bad;
1232 err = whitespace_error_string(bad);
1233 fprintf(data->o->file, "%s:%d: %s.\n",
1234 data->filename, data->lineno, err);
1235 free(err);
1236 emit_line(data->o->file, set, reset, line, 1);
1237 ws_check_emit(line + 1, len - 1, data->ws_rule,
1238 data->o->file, set, reset, ws);
1239 } else if (line[0] == ' ') {
1240 data->lineno++;
1241 data->trailing_blanks_start = 0;
1242 } else if (line[0] == '@') {
1243 char *plus = strchr(line, '+');
1244 if (plus)
1245 data->lineno = strtol(plus, NULL, 10) - 1;
1246 else
1247 die("invalid diff");
1248 data->trailing_blanks_start = 0;
1249 }
1250 }
1251
1252 static unsigned char *deflate_it(char *data,
1253 unsigned long size,
1254 unsigned long *result_size)
1255 {
1256 int bound;
1257 unsigned char *deflated;
1258 z_stream stream;
1259
1260 memset(&stream, 0, sizeof(stream));
1261 deflateInit(&stream, zlib_compression_level);
1262 bound = deflateBound(&stream, size);
1263 deflated = xmalloc(bound);
1264 stream.next_out = deflated;
1265 stream.avail_out = bound;
1266
1267 stream.next_in = (unsigned char *)data;
1268 stream.avail_in = size;
1269 while (deflate(&stream, Z_FINISH) == Z_OK)
1270 ; /* nothing */
1271 deflateEnd(&stream);
1272 *result_size = stream.total_out;
1273 return deflated;
1274 }
1275
1276 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
1277 {
1278 void *cp;
1279 void *delta;
1280 void *deflated;
1281 void *data;
1282 unsigned long orig_size;
1283 unsigned long delta_size;
1284 unsigned long deflate_size;
1285 unsigned long data_size;
1286
1287 /* We could do deflated delta, or we could do just deflated two,
1288 * whichever is smaller.
1289 */
1290 delta = NULL;
1291 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1292 if (one->size && two->size) {
1293 delta = diff_delta(one->ptr, one->size,
1294 two->ptr, two->size,
1295 &delta_size, deflate_size);
1296 if (delta) {
1297 void *to_free = delta;
1298 orig_size = delta_size;
1299 delta = deflate_it(delta, delta_size, &delta_size);
1300 free(to_free);
1301 }
1302 }
1303
1304 if (delta && delta_size < deflate_size) {
1305 fprintf(file, "delta %lu\n", orig_size);
1306 free(deflated);
1307 data = delta;
1308 data_size = delta_size;
1309 }
1310 else {
1311 fprintf(file, "literal %lu\n", two->size);
1312 free(delta);
1313 data = deflated;
1314 data_size = deflate_size;
1315 }
1316
1317 /* emit data encoded in base85 */
1318 cp = data;
1319 while (data_size) {
1320 int bytes = (52 < data_size) ? 52 : data_size;
1321 char line[70];
1322 data_size -= bytes;
1323 if (bytes <= 26)
1324 line[0] = bytes + 'A' - 1;
1325 else
1326 line[0] = bytes - 26 + 'a' - 1;
1327 encode_85(line + 1, cp, bytes);
1328 cp = (char *) cp + bytes;
1329 fputs(line, file);
1330 fputc('\n', file);
1331 }
1332 fprintf(file, "\n");
1333 free(data);
1334 }
1335
1336 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
1337 {
1338 fprintf(file, "GIT binary patch\n");
1339 emit_binary_diff_body(file, one, two);
1340 emit_binary_diff_body(file, two, one);
1341 }
1342
1343 static void setup_diff_attr_check(struct git_attr_check *check)
1344 {
1345 static struct git_attr *attr_diff;
1346
1347 if (!attr_diff) {
1348 attr_diff = git_attr("diff", 4);
1349 }
1350 check[0].attr = attr_diff;
1351 }
1352
1353 static void diff_filespec_check_attr(struct diff_filespec *one)
1354 {
1355 struct git_attr_check attr_diff_check;
1356 int check_from_data = 0;
1357
1358 if (one->checked_attr)
1359 return;
1360
1361 setup_diff_attr_check(&attr_diff_check);
1362 one->is_binary = 0;
1363 one->funcname_pattern_ident = NULL;
1364
1365 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1366 const char *value;
1367
1368 /* binaryness */
1369 value = attr_diff_check.value;
1370 if (ATTR_TRUE(value))
1371 ;
1372 else if (ATTR_FALSE(value))
1373 one->is_binary = 1;
1374 else
1375 check_from_data = 1;
1376
1377 /* funcname pattern ident */
1378 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1379 ;
1380 else
1381 one->funcname_pattern_ident = value;
1382 }
1383
1384 if (check_from_data) {
1385 if (!one->data && DIFF_FILE_VALID(one))
1386 diff_populate_filespec(one, 0);
1387
1388 if (one->data)
1389 one->is_binary = buffer_is_binary(one->data, one->size);
1390 }
1391 }
1392
1393 int diff_filespec_is_binary(struct diff_filespec *one)
1394 {
1395 diff_filespec_check_attr(one);
1396 return one->is_binary;
1397 }
1398
1399 static const char *funcname_pattern(const char *ident)
1400 {
1401 struct funcname_pattern *pp;
1402
1403 for (pp = funcname_pattern_list; pp; pp = pp->next)
1404 if (!strcmp(ident, pp->name))
1405 return pp->pattern;
1406 return NULL;
1407 }
1408
1409 static struct builtin_funcname_pattern {
1410 const char *name;
1411 const char *pattern;
1412 } builtin_funcname_pattern[] = {
1413 { "bibtex", "\\(@[a-zA-Z]\\{1,\\}[ \t]*{\\{0,1\\}[ \t]*[^ \t\"@',\\#}{~%]*\\).*$" },
1414 { "html", "^\\s*\\(<[Hh][1-6]\\s.*>.*\\)$" },
1415 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1416 "new\\|return\\|switch\\|throw\\|while\\)\n"
1417 "^[ ]*\\(\\([ ]*"
1418 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1419 "[ ]*([^;]*\\)$" },
1420 { "pascal", "^\\(\\(procedure\\|function\\|constructor\\|"
1421 "destructor\\|interface\\|implementation\\|"
1422 "initialization\\|finalization\\)[ \t]*.*\\)$"
1423 "\\|"
1424 "^\\(.*=[ \t]*\\(class\\|record\\).*\\)$"
1425 },
1426 { "php", "^[\t ]*\\(\\(function\\|class\\).*\\)" },
1427 { "python", "^\\s*\\(\\(class\\|def\\)\\s.*\\)$" },
1428 { "ruby", "^\\s*\\(\\(class\\|module\\|def\\)\\s.*\\)$" },
1429 { "tex", "^\\(\\\\\\(\\(sub\\)*section\\|chapter\\|part\\)\\*\\{0,1\\}{.*\\)$" },
1430 };
1431
1432 static const char *diff_funcname_pattern(struct diff_filespec *one)
1433 {
1434 const char *ident, *pattern;
1435 int i;
1436
1437 diff_filespec_check_attr(one);
1438 ident = one->funcname_pattern_ident;
1439
1440 if (!ident)
1441 /*
1442 * If the config file has "funcname.default" defined, that
1443 * regexp is used; otherwise NULL is returned and xemit uses
1444 * the built-in default.
1445 */
1446 return funcname_pattern("default");
1447
1448 /* Look up custom "funcname.$ident" regexp from config. */
1449 pattern = funcname_pattern(ident);
1450 if (pattern)
1451 return pattern;
1452
1453 /*
1454 * And define built-in fallback patterns here. Note that
1455 * these can be overridden by the user's config settings.
1456 */
1457 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1458 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1459 return builtin_funcname_pattern[i].pattern;
1460
1461 return NULL;
1462 }
1463
1464 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1465 {
1466 if (!options->a_prefix)
1467 options->a_prefix = a;
1468 if (!options->b_prefix)
1469 options->b_prefix = b;
1470 }
1471
1472 static void builtin_diff(const char *name_a,
1473 const char *name_b,
1474 struct diff_filespec *one,
1475 struct diff_filespec *two,
1476 const char *xfrm_msg,
1477 struct diff_options *o,
1478 int complete_rewrite)
1479 {
1480 mmfile_t mf1, mf2;
1481 const char *lbl[2];
1482 char *a_one, *b_two;
1483 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1484 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1485 const char *a_prefix, *b_prefix;
1486
1487 diff_set_mnemonic_prefix(o, "a/", "b/");
1488 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1489 a_prefix = o->b_prefix;
1490 b_prefix = o->a_prefix;
1491 } else {
1492 a_prefix = o->a_prefix;
1493 b_prefix = o->b_prefix;
1494 }
1495
1496 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1497 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1498 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1499 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1500 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1501 if (lbl[0][0] == '/') {
1502 /* /dev/null */
1503 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
1504 if (xfrm_msg && xfrm_msg[0])
1505 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1506 }
1507 else if (lbl[1][0] == '/') {
1508 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1509 if (xfrm_msg && xfrm_msg[0])
1510 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1511 }
1512 else {
1513 if (one->mode != two->mode) {
1514 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1515 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
1516 }
1517 if (xfrm_msg && xfrm_msg[0])
1518 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1519 /*
1520 * we do not run diff between different kind
1521 * of objects.
1522 */
1523 if ((one->mode ^ two->mode) & S_IFMT)
1524 goto free_ab_and_return;
1525 if (complete_rewrite) {
1526 emit_rewrite_diff(name_a, name_b, one, two, o);
1527 o->found_changes = 1;
1528 goto free_ab_and_return;
1529 }
1530 }
1531
1532 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1533 die("unable to read files to diff");
1534
1535 if (!DIFF_OPT_TST(o, TEXT) &&
1536 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1537 /* Quite common confusing case */
1538 if (mf1.size == mf2.size &&
1539 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1540 goto free_ab_and_return;
1541 if (DIFF_OPT_TST(o, BINARY))
1542 emit_binary_diff(o->file, &mf1, &mf2);
1543 else
1544 fprintf(o->file, "Binary files %s and %s differ\n",
1545 lbl[0], lbl[1]);
1546 o->found_changes = 1;
1547 }
1548 else {
1549 /* Crazy xdl interfaces.. */
1550 const char *diffopts = getenv("GIT_DIFF_OPTS");
1551 xpparam_t xpp;
1552 xdemitconf_t xecfg;
1553 xdemitcb_t ecb;
1554 struct emit_callback ecbdata;
1555 const char *funcname_pattern;
1556
1557 funcname_pattern = diff_funcname_pattern(one);
1558 if (!funcname_pattern)
1559 funcname_pattern = diff_funcname_pattern(two);
1560
1561 memset(&xecfg, 0, sizeof(xecfg));
1562 memset(&ecbdata, 0, sizeof(ecbdata));
1563 ecbdata.label_path = lbl;
1564 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1565 ecbdata.found_changesp = &o->found_changes;
1566 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1567 ecbdata.file = o->file;
1568 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1569 xecfg.ctxlen = o->context;
1570 xecfg.flags = XDL_EMIT_FUNCNAMES;
1571 if (funcname_pattern)
1572 xdiff_set_find_func(&xecfg, funcname_pattern);
1573 if (!diffopts)
1574 ;
1575 else if (!prefixcmp(diffopts, "--unified="))
1576 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1577 else if (!prefixcmp(diffopts, "-u"))
1578 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1579 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1580 ecbdata.diff_words =
1581 xcalloc(1, sizeof(struct diff_words_data));
1582 ecbdata.diff_words->file = o->file;
1583 }
1584 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
1585 &xpp, &xecfg, &ecb);
1586 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1587 free_diff_words_data(&ecbdata);
1588 }
1589
1590 free_ab_and_return:
1591 diff_free_filespec_data(one);
1592 diff_free_filespec_data(two);
1593 free(a_one);
1594 free(b_two);
1595 return;
1596 }
1597
1598 static void builtin_diffstat(const char *name_a, const char *name_b,
1599 struct diff_filespec *one,
1600 struct diff_filespec *two,
1601 struct diffstat_t *diffstat,
1602 struct diff_options *o,
1603 int complete_rewrite)
1604 {
1605 mmfile_t mf1, mf2;
1606 struct diffstat_file *data;
1607
1608 data = diffstat_add(diffstat, name_a, name_b);
1609
1610 if (!one || !two) {
1611 data->is_unmerged = 1;
1612 return;
1613 }
1614 if (complete_rewrite) {
1615 diff_populate_filespec(one, 0);
1616 diff_populate_filespec(two, 0);
1617 data->deleted = count_lines(one->data, one->size);
1618 data->added = count_lines(two->data, two->size);
1619 goto free_and_return;
1620 }
1621 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1622 die("unable to read files to diff");
1623
1624 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1625 data->is_binary = 1;
1626 data->added = mf2.size;
1627 data->deleted = mf1.size;
1628 } else {
1629 /* Crazy xdl interfaces.. */
1630 xpparam_t xpp;
1631 xdemitconf_t xecfg;
1632 xdemitcb_t ecb;
1633
1634 memset(&xecfg, 0, sizeof(xecfg));
1635 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1636 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
1637 &xpp, &xecfg, &ecb);
1638 }
1639
1640 free_and_return:
1641 diff_free_filespec_data(one);
1642 diff_free_filespec_data(two);
1643 }
1644
1645 static void builtin_checkdiff(const char *name_a, const char *name_b,
1646 const char *attr_path,
1647 struct diff_filespec *one,
1648 struct diff_filespec *two,
1649 struct diff_options *o)
1650 {
1651 mmfile_t mf1, mf2;
1652 struct checkdiff_t data;
1653
1654 if (!two)
1655 return;
1656
1657 memset(&data, 0, sizeof(data));
1658 data.filename = name_b ? name_b : name_a;
1659 data.lineno = 0;
1660 data.o = o;
1661 data.ws_rule = whitespace_rule(attr_path);
1662
1663 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1664 die("unable to read files to diff");
1665
1666 /*
1667 * All the other codepaths check both sides, but not checking
1668 * the "old" side here is deliberate. We are checking the newly
1669 * introduced changes, and as long as the "new" side is text, we
1670 * can and should check what it introduces.
1671 */
1672 if (diff_filespec_is_binary(two))
1673 goto free_and_return;
1674 else {
1675 /* Crazy xdl interfaces.. */
1676 xpparam_t xpp;
1677 xdemitconf_t xecfg;
1678 xdemitcb_t ecb;
1679
1680 memset(&xecfg, 0, sizeof(xecfg));
1681 xecfg.ctxlen = 1; /* at least one context line */
1682 xpp.flags = XDF_NEED_MINIMAL;
1683 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
1684 &xpp, &xecfg, &ecb);
1685
1686 if ((data.ws_rule & WS_TRAILING_SPACE) &&
1687 data.trailing_blanks_start) {
1688 fprintf(o->file, "%s:%d: ends with blank lines.\n",
1689 data.filename, data.trailing_blanks_start);
1690 data.status = 1; /* report errors */
1691 }
1692 }
1693 free_and_return:
1694 diff_free_filespec_data(one);
1695 diff_free_filespec_data(two);
1696 if (data.status)
1697 DIFF_OPT_SET(o, CHECK_FAILED);
1698 }
1699
1700 struct diff_filespec *alloc_filespec(const char *path)
1701 {
1702 int namelen = strlen(path);
1703 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1704
1705 memset(spec, 0, sizeof(*spec));
1706 spec->path = (char *)(spec + 1);
1707 memcpy(spec->path, path, namelen+1);
1708 spec->count = 1;
1709 return spec;
1710 }
1711
1712 void free_filespec(struct diff_filespec *spec)
1713 {
1714 if (!--spec->count) {
1715 diff_free_filespec_data(spec);
1716 free(spec);
1717 }
1718 }
1719
1720 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1721 unsigned short mode)
1722 {
1723 if (mode) {
1724 spec->mode = canon_mode(mode);
1725 hashcpy(spec->sha1, sha1);
1726 spec->sha1_valid = !is_null_sha1(sha1);
1727 }
1728 }
1729
1730 /*
1731 * Given a name and sha1 pair, if the index tells us the file in
1732 * the work tree has that object contents, return true, so that
1733 * prepare_temp_file() does not have to inflate and extract.
1734 */
1735 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1736 {
1737 struct cache_entry *ce;
1738 struct stat st;
1739 int pos, len;
1740
1741 /* We do not read the cache ourselves here, because the
1742 * benchmark with my previous version that always reads cache
1743 * shows that it makes things worse for diff-tree comparing
1744 * two linux-2.6 kernel trees in an already checked out work
1745 * tree. This is because most diff-tree comparisons deal with
1746 * only a small number of files, while reading the cache is
1747 * expensive for a large project, and its cost outweighs the
1748 * savings we get by not inflating the object to a temporary
1749 * file. Practically, this code only helps when we are used
1750 * by diff-cache --cached, which does read the cache before
1751 * calling us.
1752 */
1753 if (!active_cache)
1754 return 0;
1755
1756 /* We want to avoid the working directory if our caller
1757 * doesn't need the data in a normal file, this system
1758 * is rather slow with its stat/open/mmap/close syscalls,
1759 * and the object is contained in a pack file. The pack
1760 * is probably already open and will be faster to obtain
1761 * the data through than the working directory. Loose
1762 * objects however would tend to be slower as they need
1763 * to be individually opened and inflated.
1764 */
1765 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1766 return 0;
1767
1768 len = strlen(name);
1769 pos = cache_name_pos(name, len);
1770 if (pos < 0)
1771 return 0;
1772 ce = active_cache[pos];
1773
1774 /*
1775 * This is not the sha1 we are looking for, or
1776 * unreusable because it is not a regular file.
1777 */
1778 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1779 return 0;
1780
1781 /*
1782 * If ce matches the file in the work tree, we can reuse it.
1783 */
1784 if (ce_uptodate(ce) ||
1785 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1786 return 1;
1787
1788 return 0;
1789 }
1790
1791 static int populate_from_stdin(struct diff_filespec *s)
1792 {
1793 struct strbuf buf;
1794 size_t size = 0;
1795
1796 strbuf_init(&buf, 0);
1797 if (strbuf_read(&buf, 0, 0) < 0)
1798 return error("error while reading from stdin %s",
1799 strerror(errno));
1800
1801 s->should_munmap = 0;
1802 s->data = strbuf_detach(&buf, &size);
1803 s->size = size;
1804 s->should_free = 1;
1805 return 0;
1806 }
1807
1808 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1809 {
1810 int len;
1811 char *data = xmalloc(100);
1812 len = snprintf(data, 100,
1813 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1814 s->data = data;
1815 s->size = len;
1816 s->should_free = 1;
1817 if (size_only) {
1818 s->data = NULL;
1819 free(data);
1820 }
1821 return 0;
1822 }
1823
1824 /*
1825 * While doing rename detection and pickaxe operation, we may need to
1826 * grab the data for the blob (or file) for our own in-core comparison.
1827 * diff_filespec has data and size fields for this purpose.
1828 */
1829 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1830 {
1831 int err = 0;
1832 if (!DIFF_FILE_VALID(s))
1833 die("internal error: asking to populate invalid file.");
1834 if (S_ISDIR(s->mode))
1835 return -1;
1836
1837 if (s->data)
1838 return 0;
1839
1840 if (size_only && 0 < s->size)
1841 return 0;
1842
1843 if (S_ISGITLINK(s->mode))
1844 return diff_populate_gitlink(s, size_only);
1845
1846 if (!s->sha1_valid ||
1847 reuse_worktree_file(s->path, s->sha1, 0)) {
1848 struct strbuf buf;
1849 struct stat st;
1850 int fd;
1851
1852 if (!strcmp(s->path, "-"))
1853 return populate_from_stdin(s);
1854
1855 if (lstat(s->path, &st) < 0) {
1856 if (errno == ENOENT) {
1857 err_empty:
1858 err = -1;
1859 empty:
1860 s->data = (char *)"";
1861 s->size = 0;
1862 return err;
1863 }
1864 }
1865 s->size = xsize_t(st.st_size);
1866 if (!s->size)
1867 goto empty;
1868 if (size_only)
1869 return 0;
1870 if (S_ISLNK(st.st_mode)) {
1871 int ret;
1872 s->data = xmalloc(s->size);
1873 s->should_free = 1;
1874 ret = readlink(s->path, s->data, s->size);
1875 if (ret < 0) {
1876 free(s->data);
1877 goto err_empty;
1878 }
1879 return 0;
1880 }
1881 fd = open(s->path, O_RDONLY);
1882 if (fd < 0)
1883 goto err_empty;
1884 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1885 close(fd);
1886 s->should_munmap = 1;
1887
1888 /*
1889 * Convert from working tree format to canonical git format
1890 */
1891 strbuf_init(&buf, 0);
1892 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
1893 size_t size = 0;
1894 munmap(s->data, s->size);
1895 s->should_munmap = 0;
1896 s->data = strbuf_detach(&buf, &size);
1897 s->size = size;
1898 s->should_free = 1;
1899 }
1900 }
1901 else {
1902 enum object_type type;
1903 if (size_only)
1904 type = sha1_object_info(s->sha1, &s->size);
1905 else {
1906 s->data = read_sha1_file(s->sha1, &type, &s->size);
1907 s->should_free = 1;
1908 }
1909 }
1910 return 0;
1911 }
1912
1913 void diff_free_filespec_blob(struct diff_filespec *s)
1914 {
1915 if (s->should_free)
1916 free(s->data);
1917 else if (s->should_munmap)
1918 munmap(s->data, s->size);
1919
1920 if (s->should_free || s->should_munmap) {
1921 s->should_free = s->should_munmap = 0;
1922 s->data = NULL;
1923 }
1924 }
1925
1926 void diff_free_filespec_data(struct diff_filespec *s)
1927 {
1928 diff_free_filespec_blob(s);
1929 free(s->cnt_data);
1930 s->cnt_data = NULL;
1931 }
1932
1933 static void prep_temp_blob(struct diff_tempfile *temp,
1934 void *blob,
1935 unsigned long size,
1936 const unsigned char *sha1,
1937 int mode)
1938 {
1939 int fd;
1940
1941 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1942 if (fd < 0)
1943 die("unable to create temp-file: %s", strerror(errno));
1944 if (write_in_full(fd, blob, size) != size)
1945 die("unable to write temp-file");
1946 close(fd);
1947 temp->name = temp->tmp_path;
1948 strcpy(temp->hex, sha1_to_hex(sha1));
1949 temp->hex[40] = 0;
1950 sprintf(temp->mode, "%06o", mode);
1951 }
1952
1953 static void prepare_temp_file(const char *name,
1954 struct diff_tempfile *temp,
1955 struct diff_filespec *one)
1956 {
1957 if (!DIFF_FILE_VALID(one)) {
1958 not_a_valid_file:
1959 /* A '-' entry produces this for file-2, and
1960 * a '+' entry produces this for file-1.
1961 */
1962 temp->name = "/dev/null";
1963 strcpy(temp->hex, ".");
1964 strcpy(temp->mode, ".");
1965 return;
1966 }
1967
1968 if (!one->sha1_valid ||
1969 reuse_worktree_file(name, one->sha1, 1)) {
1970 struct stat st;
1971 if (lstat(name, &st) < 0) {
1972 if (errno == ENOENT)
1973 goto not_a_valid_file;
1974 die("stat(%s): %s", name, strerror(errno));
1975 }
1976 if (S_ISLNK(st.st_mode)) {
1977 int ret;
1978 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1979 size_t sz = xsize_t(st.st_size);
1980 if (sizeof(buf) <= st.st_size)
1981 die("symlink too long: %s", name);
1982 ret = readlink(name, buf, sz);
1983 if (ret < 0)
1984 die("readlink(%s)", name);
1985 prep_temp_blob(temp, buf, sz,
1986 (one->sha1_valid ?
1987 one->sha1 : null_sha1),
1988 (one->sha1_valid ?
1989 one->mode : S_IFLNK));
1990 }
1991 else {
1992 /* we can borrow from the file in the work tree */
1993 temp->name = name;
1994 if (!one->sha1_valid)
1995 strcpy(temp->hex, sha1_to_hex(null_sha1));
1996 else
1997 strcpy(temp->hex, sha1_to_hex(one->sha1));
1998 /* Even though we may sometimes borrow the
1999 * contents from the work tree, we always want
2000 * one->mode. mode is trustworthy even when
2001 * !(one->sha1_valid), as long as
2002 * DIFF_FILE_VALID(one).
2003 */
2004 sprintf(temp->mode, "%06o", one->mode);
2005 }
2006 return;
2007 }
2008 else {
2009 if (diff_populate_filespec(one, 0))
2010 die("cannot read data blob for %s", one->path);
2011 prep_temp_blob(temp, one->data, one->size,
2012 one->sha1, one->mode);
2013 }
2014 }
2015
2016 static void remove_tempfile(void)
2017 {
2018 int i;
2019
2020 for (i = 0; i < 2; i++)
2021 if (diff_temp[i].name == diff_temp[i].tmp_path) {
2022 unlink(diff_temp[i].name);
2023 diff_temp[i].name = NULL;
2024 }
2025 }
2026
2027 static void remove_tempfile_on_signal(int signo)
2028 {
2029 remove_tempfile();
2030 signal(SIGINT, SIG_DFL);
2031 raise(signo);
2032 }
2033
2034 /* An external diff command takes:
2035 *
2036 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2037 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2038 *
2039 */
2040 static void run_external_diff(const char *pgm,
2041 const char *name,
2042 const char *other,
2043 struct diff_filespec *one,
2044 struct diff_filespec *two,
2045 const char *xfrm_msg,
2046 int complete_rewrite)
2047 {
2048 const char *spawn_arg[10];
2049 struct diff_tempfile *temp = diff_temp;
2050 int retval;
2051 static int atexit_asked = 0;
2052 const char *othername;
2053 const char **arg = &spawn_arg[0];
2054
2055 othername = (other? other : name);
2056 if (one && two) {
2057 prepare_temp_file(name, &temp[0], one);
2058 prepare_temp_file(othername, &temp[1], two);
2059 if (! atexit_asked &&
2060 (temp[0].name == temp[0].tmp_path ||
2061 temp[1].name == temp[1].tmp_path)) {
2062 atexit_asked = 1;
2063 atexit(remove_tempfile);
2064 }
2065 signal(SIGINT, remove_tempfile_on_signal);
2066 }
2067
2068 if (one && two) {
2069 *arg++ = pgm;
2070 *arg++ = name;
2071 *arg++ = temp[0].name;
2072 *arg++ = temp[0].hex;
2073 *arg++ = temp[0].mode;
2074 *arg++ = temp[1].name;
2075 *arg++ = temp[1].hex;
2076 *arg++ = temp[1].mode;
2077 if (other) {
2078 *arg++ = other;
2079 *arg++ = xfrm_msg;
2080 }
2081 } else {
2082 *arg++ = pgm;
2083 *arg++ = name;
2084 }
2085 *arg = NULL;
2086 fflush(NULL);
2087 retval = run_command_v_opt(spawn_arg, 0);
2088 remove_tempfile();
2089 if (retval) {
2090 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2091 exit(1);
2092 }
2093 }
2094
2095 static const char *external_diff_attr(const char *name)
2096 {
2097 struct git_attr_check attr_diff_check;
2098
2099 if (!name)
2100 return NULL;
2101
2102 setup_diff_attr_check(&attr_diff_check);
2103 if (!git_checkattr(name, 1, &attr_diff_check)) {
2104 const char *value = attr_diff_check.value;
2105 if (!ATTR_TRUE(value) &&
2106 !ATTR_FALSE(value) &&
2107 !ATTR_UNSET(value)) {
2108 struct ll_diff_driver *drv;
2109
2110 for (drv = user_diff; drv; drv = drv->next)
2111 if (!strcmp(drv->name, value))
2112 return drv->cmd;
2113 }
2114 }
2115 return NULL;
2116 }
2117
2118 static void run_diff_cmd(const char *pgm,
2119 const char *name,
2120 const char *other,
2121 const char *attr_path,
2122 struct diff_filespec *one,
2123 struct diff_filespec *two,
2124 const char *xfrm_msg,
2125 struct diff_options *o,
2126 int complete_rewrite)
2127 {
2128 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2129 pgm = NULL;
2130 else {
2131 const char *cmd = external_diff_attr(attr_path);
2132 if (cmd)
2133 pgm = cmd;
2134 }
2135
2136 if (pgm) {
2137 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2138 complete_rewrite);
2139 return;
2140 }
2141 if (one && two)
2142 builtin_diff(name, other ? other : name,
2143 one, two, xfrm_msg, o, complete_rewrite);
2144 else
2145 fprintf(o->file, "* Unmerged path %s\n", name);
2146 }
2147
2148 static void diff_fill_sha1_info(struct diff_filespec *one)
2149 {
2150 if (DIFF_FILE_VALID(one)) {
2151 if (!one->sha1_valid) {
2152 struct stat st;
2153 if (!strcmp(one->path, "-")) {
2154 hashcpy(one->sha1, null_sha1);
2155 return;
2156 }
2157 if (lstat(one->path, &st) < 0)
2158 die("stat %s", one->path);
2159 if (index_path(one->sha1, one->path, &st, 0))
2160 die("cannot hash %s\n", one->path);
2161 }
2162 }
2163 else
2164 hashclr(one->sha1);
2165 }
2166
2167 static int similarity_index(struct diff_filepair *p)
2168 {
2169 return p->score * 100 / MAX_SCORE;
2170 }
2171
2172 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2173 {
2174 /* Strip the prefix but do not molest /dev/null and absolute paths */
2175 if (*namep && **namep != '/')
2176 *namep += prefix_length;
2177 if (*otherp && **otherp != '/')
2178 *otherp += prefix_length;
2179 }
2180
2181 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2182 {
2183 const char *pgm = external_diff();
2184 struct strbuf msg;
2185 char *xfrm_msg;
2186 struct diff_filespec *one = p->one;
2187 struct diff_filespec *two = p->two;
2188 const char *name;
2189 const char *other;
2190 const char *attr_path;
2191 int complete_rewrite = 0;
2192
2193 name = p->one->path;
2194 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2195 attr_path = name;
2196 if (o->prefix_length)
2197 strip_prefix(o->prefix_length, &name, &other);
2198
2199 if (DIFF_PAIR_UNMERGED(p)) {
2200 run_diff_cmd(pgm, name, NULL, attr_path,
2201 NULL, NULL, NULL, o, 0);
2202 return;
2203 }
2204
2205 diff_fill_sha1_info(one);
2206 diff_fill_sha1_info(two);
2207
2208 strbuf_init(&msg, PATH_MAX * 2 + 300);
2209 switch (p->status) {
2210 case DIFF_STATUS_COPIED:
2211 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2212 strbuf_addstr(&msg, "\ncopy from ");
2213 quote_c_style(name, &msg, NULL, 0);
2214 strbuf_addstr(&msg, "\ncopy to ");
2215 quote_c_style(other, &msg, NULL, 0);
2216 strbuf_addch(&msg, '\n');
2217 break;
2218 case DIFF_STATUS_RENAMED:
2219 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2220 strbuf_addstr(&msg, "\nrename from ");
2221 quote_c_style(name, &msg, NULL, 0);
2222 strbuf_addstr(&msg, "\nrename to ");
2223 quote_c_style(other, &msg, NULL, 0);
2224 strbuf_addch(&msg, '\n');
2225 break;
2226 case DIFF_STATUS_MODIFIED:
2227 if (p->score) {
2228 strbuf_addf(&msg, "dissimilarity index %d%%\n",
2229 similarity_index(p));
2230 complete_rewrite = 1;
2231 break;
2232 }
2233 /* fallthru */
2234 default:
2235 /* nothing */
2236 ;
2237 }
2238
2239 if (hashcmp(one->sha1, two->sha1)) {
2240 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2241
2242 if (DIFF_OPT_TST(o, BINARY)) {
2243 mmfile_t mf;
2244 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2245 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2246 abbrev = 40;
2247 }
2248 strbuf_addf(&msg, "index %.*s..%.*s",
2249 abbrev, sha1_to_hex(one->sha1),
2250 abbrev, sha1_to_hex(two->sha1));
2251 if (one->mode == two->mode)
2252 strbuf_addf(&msg, " %06o", one->mode);
2253 strbuf_addch(&msg, '\n');
2254 }
2255
2256 if (msg.len)
2257 strbuf_setlen(&msg, msg.len - 1);
2258 xfrm_msg = msg.len ? msg.buf : NULL;
2259
2260 if (!pgm &&
2261 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2262 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2263 /* a filepair that changes between file and symlink
2264 * needs to be split into deletion and creation.
2265 */
2266 struct diff_filespec *null = alloc_filespec(two->path);
2267 run_diff_cmd(NULL, name, other, attr_path,
2268 one, null, xfrm_msg, o, 0);
2269 free(null);
2270 null = alloc_filespec(one->path);
2271 run_diff_cmd(NULL, name, other, attr_path,
2272 null, two, xfrm_msg, o, 0);
2273 free(null);
2274 }
2275 else
2276 run_diff_cmd(pgm, name, other, attr_path,
2277 one, two, xfrm_msg, o, complete_rewrite);
2278
2279 strbuf_release(&msg);
2280 }
2281
2282 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2283 struct diffstat_t *diffstat)
2284 {
2285 const char *name;
2286 const char *other;
2287 int complete_rewrite = 0;
2288
2289 if (DIFF_PAIR_UNMERGED(p)) {
2290 /* unmerged */
2291 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2292 return;
2293 }
2294
2295 name = p->one->path;
2296 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2297
2298 if (o->prefix_length)
2299 strip_prefix(o->prefix_length, &name, &other);
2300
2301 diff_fill_sha1_info(p->one);
2302 diff_fill_sha1_info(p->two);
2303
2304 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2305 complete_rewrite = 1;
2306 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2307 }
2308
2309 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2310 {
2311 const char *name;
2312 const char *other;
2313 const char *attr_path;
2314
2315 if (DIFF_PAIR_UNMERGED(p)) {
2316 /* unmerged */
2317 return;
2318 }
2319
2320 name = p->one->path;
2321 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2322 attr_path = other ? other : name;
2323
2324 if (o->prefix_length)
2325 strip_prefix(o->prefix_length, &name, &other);
2326
2327 diff_fill_sha1_info(p->one);
2328 diff_fill_sha1_info(p->two);
2329
2330 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2331 }
2332
2333 void diff_setup(struct diff_options *options)
2334 {
2335 memset(options, 0, sizeof(*options));
2336
2337 options->file = stdout;
2338
2339 options->line_termination = '\n';
2340 options->break_opt = -1;
2341 options->rename_limit = -1;
2342 options->dirstat_percent = 3;
2343 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
2344 options->context = 3;
2345
2346 options->change = diff_change;
2347 options->add_remove = diff_addremove;
2348 if (diff_use_color_default > 0)
2349 DIFF_OPT_SET(options, COLOR_DIFF);
2350 else
2351 DIFF_OPT_CLR(options, COLOR_DIFF);
2352 options->detect_rename = diff_detect_rename_default;
2353
2354 if (!diff_mnemonic_prefix) {
2355 options->a_prefix = "a/";
2356 options->b_prefix = "b/";
2357 }
2358 }
2359
2360 int diff_setup_done(struct diff_options *options)
2361 {
2362 int count = 0;
2363
2364 if (options->output_format & DIFF_FORMAT_NAME)
2365 count++;
2366 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2367 count++;
2368 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2369 count++;
2370 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2371 count++;
2372 if (count > 1)
2373 die("--name-only, --name-status, --check and -s are mutually exclusive");
2374
2375 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2376 options->detect_rename = DIFF_DETECT_COPY;
2377
2378 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2379 options->prefix = NULL;
2380 if (options->prefix)
2381 options->prefix_length = strlen(options->prefix);
2382 else
2383 options->prefix_length = 0;
2384
2385 if (options->output_format & (DIFF_FORMAT_NAME |
2386 DIFF_FORMAT_NAME_STATUS |
2387 DIFF_FORMAT_CHECKDIFF |
2388 DIFF_FORMAT_NO_OUTPUT))
2389 options->output_format &= ~(DIFF_FORMAT_RAW |
2390 DIFF_FORMAT_NUMSTAT |
2391 DIFF_FORMAT_DIFFSTAT |
2392 DIFF_FORMAT_SHORTSTAT |
2393 DIFF_FORMAT_DIRSTAT |
2394 DIFF_FORMAT_SUMMARY |
2395 DIFF_FORMAT_PATCH);
2396
2397 /*
2398 * These cases always need recursive; we do not drop caller-supplied
2399 * recursive bits for other formats here.
2400 */
2401 if (options->output_format & (DIFF_FORMAT_PATCH |
2402 DIFF_FORMAT_NUMSTAT |
2403 DIFF_FORMAT_DIFFSTAT |
2404 DIFF_FORMAT_SHORTSTAT |
2405 DIFF_FORMAT_DIRSTAT |
2406 DIFF_FORMAT_SUMMARY |
2407 DIFF_FORMAT_CHECKDIFF))
2408 DIFF_OPT_SET(options, RECURSIVE);
2409 /*
2410 * Also pickaxe would not work very well if you do not say recursive
2411 */
2412 if (options->pickaxe)
2413 DIFF_OPT_SET(options, RECURSIVE);
2414
2415 if (options->detect_rename && options->rename_limit < 0)
2416 options->rename_limit = diff_rename_limit_default;
2417 if (options->setup & DIFF_SETUP_USE_CACHE) {
2418 if (!active_cache)
2419 /* read-cache does not die even when it fails
2420 * so it is safe for us to do this here. Also
2421 * it does not smudge active_cache or active_nr
2422 * when it fails, so we do not have to worry about
2423 * cleaning it up ourselves either.
2424 */
2425 read_cache();
2426 }
2427 if (options->abbrev <= 0 || 40 < options->abbrev)
2428 options->abbrev = 40; /* full */
2429
2430 /*
2431 * It does not make sense to show the first hit we happened
2432 * to have found. It does not make sense not to return with
2433 * exit code in such a case either.
2434 */
2435 if (DIFF_OPT_TST(options, QUIET)) {
2436 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2437 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2438 }
2439
2440 return 0;
2441 }
2442
2443 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2444 {
2445 char c, *eq;
2446 int len;
2447
2448 if (*arg != '-')
2449 return 0;
2450 c = *++arg;
2451 if (!c)
2452 return 0;
2453 if (c == arg_short) {
2454 c = *++arg;
2455 if (!c)
2456 return 1;
2457 if (val && isdigit(c)) {
2458 char *end;
2459 int n = strtoul(arg, &end, 10);
2460 if (*end)
2461 return 0;
2462 *val = n;
2463 return 1;
2464 }
2465 return 0;
2466 }
2467 if (c != '-')
2468 return 0;
2469 arg++;
2470 eq = strchr(arg, '=');
2471 if (eq)
2472 len = eq - arg;
2473 else
2474 len = strlen(arg);
2475 if (!len || strncmp(arg, arg_long, len))
2476 return 0;
2477 if (eq) {
2478 int n;
2479 char *end;
2480 if (!isdigit(*++eq))
2481 return 0;
2482 n = strtoul(eq, &end, 10);
2483 if (*end)
2484 return 0;
2485 *val = n;
2486 }
2487 return 1;
2488 }
2489
2490 static int diff_scoreopt_parse(const char *opt);
2491
2492 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2493 {
2494 const char *arg = av[0];
2495
2496 /* Output format options */
2497 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2498 options->output_format |= DIFF_FORMAT_PATCH;
2499 else if (opt_arg(arg, 'U', "unified", &options->context))
2500 options->output_format |= DIFF_FORMAT_PATCH;
2501 else if (!strcmp(arg, "--raw"))
2502 options->output_format |= DIFF_FORMAT_RAW;
2503 else if (!strcmp(arg, "--patch-with-raw"))
2504 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2505 else if (!strcmp(arg, "--numstat"))
2506 options->output_format |= DIFF_FORMAT_NUMSTAT;
2507 else if (!strcmp(arg, "--shortstat"))
2508 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2509 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2510 options->output_format |= DIFF_FORMAT_DIRSTAT;
2511 else if (!strcmp(arg, "--cumulative")) {
2512 options->output_format |= DIFF_FORMAT_DIRSTAT;
2513 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
2514 }
2515 else if (!strcmp(arg, "--check"))
2516 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2517 else if (!strcmp(arg, "--summary"))
2518 options->output_format |= DIFF_FORMAT_SUMMARY;
2519 else if (!strcmp(arg, "--patch-with-stat"))
2520 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2521 else if (!strcmp(arg, "--name-only"))
2522 options->output_format |= DIFF_FORMAT_NAME;
2523 else if (!strcmp(arg, "--name-status"))
2524 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2525 else if (!strcmp(arg, "-s"))
2526 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2527 else if (!prefixcmp(arg, "--stat")) {
2528 char *end;
2529 int width = options->stat_width;
2530 int name_width = options->stat_name_width;
2531 arg += 6;
2532 end = (char *)arg;
2533
2534 switch (*arg) {
2535 case '-':
2536 if (!prefixcmp(arg, "-width="))
2537 width = strtoul(arg + 7, &end, 10);
2538 else if (!prefixcmp(arg, "-name-width="))
2539 name_width = strtoul(arg + 12, &end, 10);
2540 break;
2541 case '=':
2542 width = strtoul(arg+1, &end, 10);
2543 if (*end == ',')
2544 name_width = strtoul(end+1, &end, 10);
2545 }
2546
2547 /* Important! This checks all the error cases! */
2548 if (*end)
2549 return 0;
2550 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2551 options->stat_name_width = name_width;
2552 options->stat_width = width;
2553 }
2554
2555 /* renames options */
2556 else if (!prefixcmp(arg, "-B")) {
2557 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2558 return -1;
2559 }
2560 else if (!prefixcmp(arg, "-M")) {
2561 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2562 return -1;
2563 options->detect_rename = DIFF_DETECT_RENAME;
2564 }
2565 else if (!prefixcmp(arg, "-C")) {
2566 if (options->detect_rename == DIFF_DETECT_COPY)
2567 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2568 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2569 return -1;
2570 options->detect_rename = DIFF_DETECT_COPY;
2571 }
2572 else if (!strcmp(arg, "--no-renames"))
2573 options->detect_rename = 0;
2574 else if (!strcmp(arg, "--relative"))
2575 DIFF_OPT_SET(options, RELATIVE_NAME);
2576 else if (!prefixcmp(arg, "--relative=")) {
2577 DIFF_OPT_SET(options, RELATIVE_NAME);
2578 options->prefix = arg + 11;
2579 }
2580
2581 /* xdiff options */
2582 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2583 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2584 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2585 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2586 else if (!strcmp(arg, "--ignore-space-at-eol"))
2587 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2588
2589 /* flags options */
2590 else if (!strcmp(arg, "--binary")) {
2591 options->output_format |= DIFF_FORMAT_PATCH;
2592 DIFF_OPT_SET(options, BINARY);
2593 }
2594 else if (!strcmp(arg, "--full-index"))
2595 DIFF_OPT_SET(options, FULL_INDEX);
2596 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2597 DIFF_OPT_SET(options, TEXT);
2598 else if (!strcmp(arg, "-R"))
2599 DIFF_OPT_SET(options, REVERSE_DIFF);
2600 else if (!strcmp(arg, "--find-copies-harder"))
2601 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2602 else if (!strcmp(arg, "--follow"))
2603 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2604 else if (!strcmp(arg, "--color"))
2605 DIFF_OPT_SET(options, COLOR_DIFF);
2606 else if (!strcmp(arg, "--no-color"))
2607 DIFF_OPT_CLR(options, COLOR_DIFF);
2608 else if (!strcmp(arg, "--color-words"))
2609 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2610 else if (!strcmp(arg, "--exit-code"))
2611 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2612 else if (!strcmp(arg, "--quiet"))
2613 DIFF_OPT_SET(options, QUIET);
2614 else if (!strcmp(arg, "--ext-diff"))
2615 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2616 else if (!strcmp(arg, "--no-ext-diff"))
2617 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2618 else if (!strcmp(arg, "--ignore-submodules"))
2619 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2620
2621 /* misc options */
2622 else if (!strcmp(arg, "-z"))
2623 options->line_termination = 0;
2624 else if (!prefixcmp(arg, "-l"))
2625 options->rename_limit = strtoul(arg+2, NULL, 10);
2626 else if (!prefixcmp(arg, "-S"))
2627 options->pickaxe = arg + 2;
2628 else if (!strcmp(arg, "--pickaxe-all"))
2629 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2630 else if (!strcmp(arg, "--pickaxe-regex"))
2631 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2632 else if (!prefixcmp(arg, "-O"))
2633 options->orderfile = arg + 2;
2634 else if (!prefixcmp(arg, "--diff-filter="))
2635 options->filter = arg + 14;
2636 else if (!strcmp(arg, "--abbrev"))
2637 options->abbrev = DEFAULT_ABBREV;
2638 else if (!prefixcmp(arg, "--abbrev=")) {
2639 options->abbrev = strtoul(arg + 9, NULL, 10);
2640 if (options->abbrev < MINIMUM_ABBREV)
2641 options->abbrev = MINIMUM_ABBREV;
2642 else if (40 < options->abbrev)
2643 options->abbrev = 40;
2644 }
2645 else if (!prefixcmp(arg, "--src-prefix="))
2646 options->a_prefix = arg + 13;
2647 else if (!prefixcmp(arg, "--dst-prefix="))
2648 options->b_prefix = arg + 13;
2649 else if (!strcmp(arg, "--no-prefix"))
2650 options->a_prefix = options->b_prefix = "";
2651 else if (!prefixcmp(arg, "--output=")) {
2652 options->file = fopen(arg + strlen("--output="), "w");
2653 options->close_file = 1;
2654 } else
2655 return 0;
2656 return 1;
2657 }
2658
2659 static int parse_num(const char **cp_p)
2660 {
2661 unsigned long num, scale;
2662 int ch, dot;
2663 const char *cp = *cp_p;
2664
2665 num = 0;
2666 scale = 1;
2667 dot = 0;
2668 for(;;) {
2669 ch = *cp;
2670 if ( !dot && ch == '.' ) {
2671 scale = 1;
2672 dot = 1;
2673 } else if ( ch == '%' ) {
2674 scale = dot ? scale*100 : 100;
2675 cp++; /* % is always at the end */
2676 break;
2677 } else if ( ch >= '0' && ch <= '9' ) {
2678 if ( scale < 100000 ) {
2679 scale *= 10;
2680 num = (num*10) + (ch-'0');
2681 }
2682 } else {
2683 break;
2684 }
2685 cp++;
2686 }
2687 *cp_p = cp;
2688
2689 /* user says num divided by scale and we say internally that
2690 * is MAX_SCORE * num / scale.
2691 */
2692 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2693 }
2694
2695 static int diff_scoreopt_parse(const char *opt)
2696 {
2697 int opt1, opt2, cmd;
2698
2699 if (*opt++ != '-')
2700 return -1;
2701 cmd = *opt++;
2702 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2703 return -1; /* that is not a -M, -C nor -B option */
2704
2705 opt1 = parse_num(&opt);
2706 if (cmd != 'B')
2707 opt2 = 0;
2708 else {
2709 if (*opt == 0)
2710 opt2 = 0;
2711 else if (*opt != '/')
2712 return -1; /* we expect -B80/99 or -B80 */
2713 else {
2714 opt++;
2715 opt2 = parse_num(&opt);
2716 }
2717 }
2718 if (*opt != 0)
2719 return -1;
2720 return opt1 | (opt2 << 16);
2721 }
2722
2723 struct diff_queue_struct diff_queued_diff;
2724
2725 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2726 {
2727 if (queue->alloc <= queue->nr) {
2728 queue->alloc = alloc_nr(queue->alloc);
2729 queue->queue = xrealloc(queue->queue,
2730 sizeof(dp) * queue->alloc);
2731 }
2732 queue->queue[queue->nr++] = dp;
2733 }
2734
2735 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2736 struct diff_filespec *one,
2737 struct diff_filespec *two)
2738 {
2739 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2740 dp->one = one;
2741 dp->two = two;
2742 if (queue)
2743 diff_q(queue, dp);
2744 return dp;
2745 }
2746
2747 void diff_free_filepair(struct diff_filepair *p)
2748 {
2749 free_filespec(p->one);
2750 free_filespec(p->two);
2751 free(p);
2752 }
2753
2754 /* This is different from find_unique_abbrev() in that
2755 * it stuffs the result with dots for alignment.
2756 */
2757 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2758 {
2759 int abblen;
2760 const char *abbrev;
2761 if (len == 40)
2762 return sha1_to_hex(sha1);
2763
2764 abbrev = find_unique_abbrev(sha1, len);
2765 abblen = strlen(abbrev);
2766 if (abblen < 37) {
2767 static char hex[41];
2768 if (len < abblen && abblen <= len + 2)
2769 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2770 else
2771 sprintf(hex, "%s...", abbrev);
2772 return hex;
2773 }
2774 return sha1_to_hex(sha1);
2775 }
2776
2777 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2778 {
2779 int line_termination = opt->line_termination;
2780 int inter_name_termination = line_termination ? '\t' : '\0';
2781
2782 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2783 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2784 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2785 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2786 }
2787 if (p->score) {
2788 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2789 inter_name_termination);
2790 } else {
2791 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
2792 }
2793
2794 if (p->status == DIFF_STATUS_COPIED ||
2795 p->status == DIFF_STATUS_RENAMED) {
2796 const char *name_a, *name_b;
2797 name_a = p->one->path;
2798 name_b = p->two->path;
2799 strip_prefix(opt->prefix_length, &name_a, &name_b);
2800 write_name_quoted(name_a, opt->file, inter_name_termination);
2801 write_name_quoted(name_b, opt->file, line_termination);
2802 } else {
2803 const char *name_a, *name_b;
2804 name_a = p->one->mode ? p->one->path : p->two->path;
2805 name_b = NULL;
2806 strip_prefix(opt->prefix_length, &name_a, &name_b);
2807 write_name_quoted(name_a, opt->file, line_termination);
2808 }
2809 }
2810
2811 int diff_unmodified_pair(struct diff_filepair *p)
2812 {
2813 /* This function is written stricter than necessary to support
2814 * the currently implemented transformers, but the idea is to
2815 * let transformers to produce diff_filepairs any way they want,
2816 * and filter and clean them up here before producing the output.
2817 */
2818 struct diff_filespec *one = p->one, *two = p->two;
2819
2820 if (DIFF_PAIR_UNMERGED(p))
2821 return 0; /* unmerged is interesting */
2822
2823 /* deletion, addition, mode or type change
2824 * and rename are all interesting.
2825 */
2826 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2827 DIFF_PAIR_MODE_CHANGED(p) ||
2828 strcmp(one->path, two->path))
2829 return 0;
2830
2831 /* both are valid and point at the same path. that is, we are
2832 * dealing with a change.
2833 */
2834 if (one->sha1_valid && two->sha1_valid &&
2835 !hashcmp(one->sha1, two->sha1))
2836 return 1; /* no change */
2837 if (!one->sha1_valid && !two->sha1_valid)
2838 return 1; /* both look at the same file on the filesystem. */
2839 return 0;
2840 }
2841
2842 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2843 {
2844 if (diff_unmodified_pair(p))
2845 return;
2846
2847 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2848 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2849 return; /* no tree diffs in patch format */
2850
2851 run_diff(p, o);
2852 }
2853
2854 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2855 struct diffstat_t *diffstat)
2856 {
2857 if (diff_unmodified_pair(p))
2858 return;
2859
2860 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2861 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2862 return; /* no tree diffs in patch format */
2863
2864 run_diffstat(p, o, diffstat);
2865 }
2866
2867 static void diff_flush_checkdiff(struct diff_filepair *p,
2868 struct diff_options *o)
2869 {
2870 if (diff_unmodified_pair(p))
2871 return;
2872
2873 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2874 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2875 return; /* no tree diffs in patch format */
2876
2877 run_checkdiff(p, o);
2878 }
2879
2880 int diff_queue_is_empty(void)
2881 {
2882 struct diff_queue_struct *q = &diff_queued_diff;
2883 int i;
2884 for (i = 0; i < q->nr; i++)
2885 if (!diff_unmodified_pair(q->queue[i]))
2886 return 0;
2887 return 1;
2888 }
2889
2890 #if DIFF_DEBUG
2891 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2892 {
2893 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2894 x, one ? one : "",
2895 s->path,
2896 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2897 s->mode,
2898 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2899 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2900 x, one ? one : "",
2901 s->size, s->xfrm_flags);
2902 }
2903
2904 void diff_debug_filepair(const struct diff_filepair *p, int i)
2905 {
2906 diff_debug_filespec(p->one, i, "one");
2907 diff_debug_filespec(p->two, i, "two");
2908 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2909 p->score, p->status ? p->status : '?',
2910 p->one->rename_used, p->broken_pair);
2911 }
2912
2913 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2914 {
2915 int i;
2916 if (msg)
2917 fprintf(stderr, "%s\n", msg);
2918 fprintf(stderr, "q->nr = %d\n", q->nr);
2919 for (i = 0; i < q->nr; i++) {
2920 struct diff_filepair *p = q->queue[i];
2921 diff_debug_filepair(p, i);
2922 }
2923 }
2924 #endif
2925
2926 static void diff_resolve_rename_copy(void)
2927 {
2928 int i;
2929 struct diff_filepair *p;
2930 struct diff_queue_struct *q = &diff_queued_diff;
2931
2932 diff_debug_queue("resolve-rename-copy", q);
2933
2934 for (i = 0; i < q->nr; i++) {
2935 p = q->queue[i];
2936 p->status = 0; /* undecided */
2937 if (DIFF_PAIR_UNMERGED(p))
2938 p->status = DIFF_STATUS_UNMERGED;
2939 else if (!DIFF_FILE_VALID(p->one))
2940 p->status = DIFF_STATUS_ADDED;
2941 else if (!DIFF_FILE_VALID(p->two))
2942 p->status = DIFF_STATUS_DELETED;
2943 else if (DIFF_PAIR_TYPE_CHANGED(p))
2944 p->status = DIFF_STATUS_TYPE_CHANGED;
2945
2946 /* from this point on, we are dealing with a pair
2947 * whose both sides are valid and of the same type, i.e.
2948 * either in-place edit or rename/copy edit.
2949 */
2950 else if (DIFF_PAIR_RENAME(p)) {
2951 /*
2952 * A rename might have re-connected a broken
2953 * pair up, causing the pathnames to be the
2954 * same again. If so, that's not a rename at
2955 * all, just a modification..
2956 *
2957 * Otherwise, see if this source was used for
2958 * multiple renames, in which case we decrement
2959 * the count, and call it a copy.
2960 */
2961 if (!strcmp(p->one->path, p->two->path))
2962 p->status = DIFF_STATUS_MODIFIED;
2963 else if (--p->one->rename_used > 0)
2964 p->status = DIFF_STATUS_COPIED;
2965 else
2966 p->status = DIFF_STATUS_RENAMED;
2967 }
2968 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2969 p->one->mode != p->two->mode ||
2970 is_null_sha1(p->one->sha1))
2971 p->status = DIFF_STATUS_MODIFIED;
2972 else {
2973 /* This is a "no-change" entry and should not
2974 * happen anymore, but prepare for broken callers.
2975 */
2976 error("feeding unmodified %s to diffcore",
2977 p->one->path);
2978 p->status = DIFF_STATUS_UNKNOWN;
2979 }
2980 }
2981 diff_debug_queue("resolve-rename-copy done", q);
2982 }
2983
2984 static int check_pair_status(struct diff_filepair *p)
2985 {
2986 switch (p->status) {
2987 case DIFF_STATUS_UNKNOWN:
2988 return 0;
2989 case 0:
2990 die("internal error in diff-resolve-rename-copy");
2991 default:
2992 return 1;
2993 }
2994 }
2995
2996 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2997 {
2998 int fmt = opt->output_format;
2999
3000 if (fmt & DIFF_FORMAT_CHECKDIFF)
3001 diff_flush_checkdiff(p, opt);
3002 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3003 diff_flush_raw(p, opt);
3004 else if (fmt & DIFF_FORMAT_NAME) {
3005 const char *name_a, *name_b;
3006 name_a = p->two->path;
3007 name_b = NULL;
3008 strip_prefix(opt->prefix_length, &name_a, &name_b);
3009 write_name_quoted(name_a, opt->file, opt->line_termination);
3010 }
3011 }
3012
3013 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3014 {
3015 if (fs->mode)
3016 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3017 else
3018 fprintf(file, " %s ", newdelete);
3019 write_name_quoted(fs->path, file, '\n');
3020 }
3021
3022
3023 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
3024 {
3025 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3026 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
3027 show_name ? ' ' : '\n');
3028 if (show_name) {
3029 write_name_quoted(p->two->path, file, '\n');
3030 }
3031 }
3032 }
3033
3034 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
3035 {
3036 char *names = pprint_rename(p->one->path, p->two->path);
3037
3038 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3039 free(names);
3040 show_mode_change(file, p, 0);
3041 }
3042
3043 static void diff_summary(FILE *file, struct diff_filepair *p)
3044 {
3045 switch(p->status) {
3046 case DIFF_STATUS_DELETED:
3047 show_file_mode_name(file, "delete", p->one);
3048 break;
3049 case DIFF_STATUS_ADDED:
3050 show_file_mode_name(file, "create", p->two);
3051 break;
3052 case DIFF_STATUS_COPIED:
3053 show_rename_copy(file, "copy", p);
3054 break;
3055 case DIFF_STATUS_RENAMED:
3056 show_rename_copy(file, "rename", p);
3057 break;
3058 default:
3059 if (p->score) {
3060 fputs(" rewrite ", file);
3061 write_name_quoted(p->two->path, file, ' ');
3062 fprintf(file, "(%d%%)\n", similarity_index(p));
3063 }
3064 show_mode_change(file, p, !p->score);
3065 break;
3066 }
3067 }
3068
3069 struct patch_id_t {
3070 SHA_CTX *ctx;
3071 int patchlen;
3072 };
3073
3074 static int remove_space(char *line, int len)
3075 {
3076 int i;
3077 char *dst = line;
3078 unsigned char c;
3079
3080 for (i = 0; i < len; i++)
3081 if (!isspace((c = line[i])))
3082 *dst++ = c;
3083
3084 return dst - line;
3085 }
3086
3087 static void patch_id_consume(void *priv, char *line, unsigned long len)
3088 {
3089 struct patch_id_t *data = priv;
3090 int new_len;
3091
3092 /* Ignore line numbers when computing the SHA1 of the patch */
3093 if (!prefixcmp(line, "@@ -"))
3094 return;
3095
3096 new_len = remove_space(line, len);
3097
3098 SHA1_Update(data->ctx, line, new_len);
3099 data->patchlen += new_len;
3100 }
3101
3102 /* returns 0 upon success, and writes result into sha1 */
3103 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3104 {
3105 struct diff_queue_struct *q = &diff_queued_diff;
3106 int i;
3107 SHA_CTX ctx;
3108 struct patch_id_t data;
3109 char buffer[PATH_MAX * 4 + 20];
3110
3111 SHA1_Init(&ctx);
3112 memset(&data, 0, sizeof(struct patch_id_t));
3113 data.ctx = &ctx;
3114
3115 for (i = 0; i < q->nr; i++) {
3116 xpparam_t xpp;
3117 xdemitconf_t xecfg;
3118 xdemitcb_t ecb;
3119 mmfile_t mf1, mf2;
3120 struct diff_filepair *p = q->queue[i];
3121 int len1, len2;
3122
3123 memset(&xecfg, 0, sizeof(xecfg));
3124 if (p->status == 0)
3125 return error("internal diff status error");
3126 if (p->status == DIFF_STATUS_UNKNOWN)
3127 continue;
3128 if (diff_unmodified_pair(p))
3129 continue;
3130 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3131 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3132 continue;
3133 if (DIFF_PAIR_UNMERGED(p))
3134 continue;
3135
3136 diff_fill_sha1_info(p->one);
3137 diff_fill_sha1_info(p->two);
3138 if (fill_mmfile(&mf1, p->one) < 0 ||
3139 fill_mmfile(&mf2, p->two) < 0)
3140 return error("unable to read files to diff");
3141
3142 len1 = remove_space(p->one->path, strlen(p->one->path));
3143 len2 = remove_space(p->two->path, strlen(p->two->path));
3144 if (p->one->mode == 0)
3145 len1 = snprintf(buffer, sizeof(buffer),
3146 "diff--gita/%.*sb/%.*s"
3147 "newfilemode%06o"
3148 "---/dev/null"
3149 "+++b/%.*s",
3150 len1, p->one->path,
3151 len2, p->two->path,
3152 p->two->mode,
3153 len2, p->two->path);
3154 else if (p->two->mode == 0)
3155 len1 = snprintf(buffer, sizeof(buffer),
3156 "diff--gita/%.*sb/%.*s"
3157 "deletedfilemode%06o"
3158 "---a/%.*s"
3159 "+++/dev/null",
3160 len1, p->one->path,
3161 len2, p->two->path,
3162 p->one->mode,
3163 len1, p->one->path);
3164 else
3165 len1 = snprintf(buffer, sizeof(buffer),
3166 "diff--gita/%.*sb/%.*s"
3167 "---a/%.*s"
3168 "+++b/%.*s",
3169 len1, p->one->path,
3170 len2, p->two->path,
3171 len1, p->one->path,
3172 len2, p->two->path);
3173 SHA1_Update(&ctx, buffer, len1);
3174
3175 xpp.flags = XDF_NEED_MINIMAL;
3176 xecfg.ctxlen = 3;
3177 xecfg.flags = XDL_EMIT_FUNCNAMES;
3178 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3179 &xpp, &xecfg, &ecb);
3180 }
3181
3182 SHA1_Final(sha1, &ctx);
3183 return 0;
3184 }
3185
3186 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3187 {
3188 struct diff_queue_struct *q = &diff_queued_diff;
3189 int i;
3190 int result = diff_get_patch_id(options, sha1);
3191
3192 for (i = 0; i < q->nr; i++)
3193 diff_free_filepair(q->queue[i]);
3194
3195 free(q->queue);
3196 q->queue = NULL;
3197 q->nr = q->alloc = 0;
3198
3199 return result;
3200 }
3201
3202 static int is_summary_empty(const struct diff_queue_struct *q)
3203 {
3204 int i;
3205
3206 for (i = 0; i < q->nr; i++) {
3207 const struct diff_filepair *p = q->queue[i];
3208
3209 switch (p->status) {
3210 case DIFF_STATUS_DELETED:
3211 case DIFF_STATUS_ADDED:
3212 case DIFF_STATUS_COPIED:
3213 case DIFF_STATUS_RENAMED:
3214 return 0;
3215 default:
3216 if (p->score)
3217 return 0;
3218 if (p->one->mode && p->two->mode &&
3219 p->one->mode != p->two->mode)
3220 return 0;
3221 break;
3222 }
3223 }
3224 return 1;
3225 }
3226
3227 void diff_flush(struct diff_options *options)
3228 {
3229 struct diff_queue_struct *q = &diff_queued_diff;
3230 int i, output_format = options->output_format;
3231 int separator = 0;
3232
3233 /*
3234 * Order: raw, stat, summary, patch
3235 * or: name/name-status/checkdiff (other bits clear)
3236 */
3237 if (!q->nr)
3238 goto free_queue;
3239
3240 if (output_format & (DIFF_FORMAT_RAW |
3241 DIFF_FORMAT_NAME |
3242 DIFF_FORMAT_NAME_STATUS |
3243 DIFF_FORMAT_CHECKDIFF)) {
3244 for (i = 0; i < q->nr; i++) {
3245 struct diff_filepair *p = q->queue[i];
3246 if (check_pair_status(p))
3247 flush_one_pair(p, options);
3248 }
3249 separator++;
3250 }
3251
3252 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3253 struct diffstat_t diffstat;
3254
3255 memset(&diffstat, 0, sizeof(struct diffstat_t));
3256 for (i = 0; i < q->nr; i++) {
3257 struct diff_filepair *p = q->queue[i];
3258 if (check_pair_status(p))
3259 diff_flush_stat(p, options, &diffstat);
3260 }
3261 if (output_format & DIFF_FORMAT_NUMSTAT)
3262 show_numstat(&diffstat, options);
3263 if (output_format & DIFF_FORMAT_DIFFSTAT)
3264 show_stats(&diffstat, options);
3265 if (output_format & DIFF_FORMAT_SHORTSTAT)
3266 show_shortstats(&diffstat, options);
3267 free_diffstat_info(&diffstat);
3268 separator++;
3269 }
3270 if (output_format & DIFF_FORMAT_DIRSTAT)
3271 show_dirstat(options);
3272
3273 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3274 for (i = 0; i < q->nr; i++)
3275 diff_summary(options->file, q->queue[i]);
3276 separator++;
3277 }
3278
3279 if (output_format & DIFF_FORMAT_PATCH) {
3280 if (separator) {
3281 putc(options->line_termination, options->file);
3282 if (options->stat_sep) {
3283 /* attach patch instead of inline */
3284 fputs(options->stat_sep, options->file);
3285 }
3286 }
3287
3288 for (i = 0; i < q->nr; i++) {
3289 struct diff_filepair *p = q->queue[i];
3290 if (check_pair_status(p))
3291 diff_flush_patch(p, options);
3292 }
3293 }
3294
3295 if (output_format & DIFF_FORMAT_CALLBACK)
3296 options->format_callback(q, options, options->format_callback_data);
3297
3298 for (i = 0; i < q->nr; i++)
3299 diff_free_filepair(q->queue[i]);
3300 free_queue:
3301 free(q->queue);
3302 q->queue = NULL;
3303 q->nr = q->alloc = 0;
3304 if (options->close_file)
3305 fclose(options->file);
3306 }
3307
3308 static void diffcore_apply_filter(const char *filter)
3309 {
3310 int i;
3311 struct diff_queue_struct *q = &diff_queued_diff;
3312 struct diff_queue_struct outq;
3313 outq.queue = NULL;
3314 outq.nr = outq.alloc = 0;
3315
3316 if (!filter)
3317 return;
3318
3319 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3320 int found;
3321 for (i = found = 0; !found && i < q->nr; i++) {
3322 struct diff_filepair *p = q->queue[i];
3323 if (((p->status == DIFF_STATUS_MODIFIED) &&
3324 ((p->score &&
3325 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3326 (!p->score &&
3327 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3328 ((p->status != DIFF_STATUS_MODIFIED) &&
3329 strchr(filter, p->status)))
3330 found++;
3331 }
3332 if (found)
3333 return;
3334
3335 /* otherwise we will clear the whole queue
3336 * by copying the empty outq at the end of this
3337 * function, but first clear the current entries
3338 * in the queue.
3339 */
3340 for (i = 0; i < q->nr; i++)
3341 diff_free_filepair(q->queue[i]);
3342 }
3343 else {
3344 /* Only the matching ones */
3345 for (i = 0; i < q->nr; i++) {
3346 struct diff_filepair *p = q->queue[i];
3347
3348 if (((p->status == DIFF_STATUS_MODIFIED) &&
3349 ((p->score &&
3350 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3351 (!p->score &&
3352 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3353 ((p->status != DIFF_STATUS_MODIFIED) &&
3354 strchr(filter, p->status)))
3355 diff_q(&outq, p);
3356 else
3357 diff_free_filepair(p);
3358 }
3359 }
3360 free(q->queue);
3361 *q = outq;
3362 }
3363
3364 /* Check whether two filespecs with the same mode and size are identical */
3365 static int diff_filespec_is_identical(struct diff_filespec *one,
3366 struct diff_filespec *two)
3367 {
3368 if (S_ISGITLINK(one->mode))
3369 return 0;
3370 if (diff_populate_filespec(one, 0))
3371 return 0;
3372 if (diff_populate_filespec(two, 0))
3373 return 0;
3374 return !memcmp(one->data, two->data, one->size);
3375 }
3376
3377 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3378 {
3379 int i;
3380 struct diff_queue_struct *q = &diff_queued_diff;
3381 struct diff_queue_struct outq;
3382 outq.queue = NULL;
3383 outq.nr = outq.alloc = 0;
3384
3385 for (i = 0; i < q->nr; i++) {
3386 struct diff_filepair *p = q->queue[i];
3387
3388 /*
3389 * 1. Entries that come from stat info dirtyness
3390 * always have both sides (iow, not create/delete),
3391 * one side of the object name is unknown, with
3392 * the same mode and size. Keep the ones that
3393 * do not match these criteria. They have real
3394 * differences.
3395 *
3396 * 2. At this point, the file is known to be modified,
3397 * with the same mode and size, and the object
3398 * name of one side is unknown. Need to inspect
3399 * the identical contents.
3400 */
3401 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3402 !DIFF_FILE_VALID(p->two) ||
3403 (p->one->sha1_valid && p->two->sha1_valid) ||
3404 (p->one->mode != p->two->mode) ||
3405 diff_populate_filespec(p->one, 1) ||
3406 diff_populate_filespec(p->two, 1) ||
3407 (p->one->size != p->two->size) ||
3408 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3409 diff_q(&outq, p);
3410 else {
3411 /*
3412 * The caller can subtract 1 from skip_stat_unmatch
3413 * to determine how many paths were dirty only
3414 * due to stat info mismatch.
3415 */
3416 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3417 diffopt->skip_stat_unmatch++;
3418 diff_free_filepair(p);
3419 }
3420 }
3421 free(q->queue);
3422 *q = outq;
3423 }
3424
3425 void diffcore_std(struct diff_options *options)
3426 {
3427 if (options->skip_stat_unmatch)
3428 diffcore_skip_stat_unmatch(options);
3429 if (options->break_opt != -1)
3430 diffcore_break(options->break_opt);
3431 if (options->detect_rename)
3432 diffcore_rename(options);
3433 if (options->break_opt != -1)
3434 diffcore_merge_broken();
3435 if (options->pickaxe)
3436 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3437 if (options->orderfile)
3438 diffcore_order(options->orderfile);
3439 diff_resolve_rename_copy();
3440 diffcore_apply_filter(options->filter);
3441
3442 if (diff_queued_diff.nr)
3443 DIFF_OPT_SET(options, HAS_CHANGES);
3444 else
3445 DIFF_OPT_CLR(options, HAS_CHANGES);
3446 }
3447
3448 int diff_result_code(struct diff_options *opt, int status)
3449 {
3450 int result = 0;
3451 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3452 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3453 return status;
3454 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3455 DIFF_OPT_TST(opt, HAS_CHANGES))
3456 result |= 01;
3457 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3458 DIFF_OPT_TST(opt, CHECK_FAILED))
3459 result |= 02;
3460 return result;
3461 }
3462
3463 void diff_addremove(struct diff_options *options,
3464 int addremove, unsigned mode,
3465 const unsigned char *sha1,
3466 const char *concatpath)
3467 {
3468 struct diff_filespec *one, *two;
3469
3470 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3471 return;
3472
3473 /* This may look odd, but it is a preparation for
3474 * feeding "there are unchanged files which should
3475 * not produce diffs, but when you are doing copy
3476 * detection you would need them, so here they are"
3477 * entries to the diff-core. They will be prefixed
3478 * with something like '=' or '*' (I haven't decided
3479 * which but should not make any difference).
3480 * Feeding the same new and old to diff_change()
3481 * also has the same effect.
3482 * Before the final output happens, they are pruned after
3483 * merged into rename/copy pairs as appropriate.
3484 */
3485 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3486 addremove = (addremove == '+' ? '-' :
3487 addremove == '-' ? '+' : addremove);
3488
3489 if (options->prefix &&
3490 strncmp(concatpath, options->prefix, options->prefix_length))
3491 return;
3492
3493 one = alloc_filespec(concatpath);
3494 two = alloc_filespec(concatpath);
3495
3496 if (addremove != '+')
3497 fill_filespec(one, sha1, mode);
3498 if (addremove != '-')
3499 fill_filespec(two, sha1, mode);
3500
3501 diff_queue(&diff_queued_diff, one, two);
3502 DIFF_OPT_SET(options, HAS_CHANGES);
3503 }
3504
3505 void diff_change(struct diff_options *options,
3506 unsigned old_mode, unsigned new_mode,
3507 const unsigned char *old_sha1,
3508 const unsigned char *new_sha1,
3509 const char *concatpath)
3510 {
3511 struct diff_filespec *one, *two;
3512
3513 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3514 && S_ISGITLINK(new_mode))
3515 return;
3516
3517 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3518 unsigned tmp;
3519 const unsigned char *tmp_c;
3520 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3521 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3522 }
3523
3524 if (options->prefix &&
3525 strncmp(concatpath, options->prefix, options->prefix_length))
3526 return;
3527
3528 one = alloc_filespec(concatpath);
3529 two = alloc_filespec(concatpath);
3530 fill_filespec(one, old_sha1, old_mode);
3531 fill_filespec(two, new_sha1, new_mode);
3532
3533 diff_queue(&diff_queued_diff, one, two);
3534 DIFF_OPT_SET(options, HAS_CHANGES);
3535 }
3536
3537 void diff_unmerge(struct diff_options *options,
3538 const char *path,
3539 unsigned mode, const unsigned char *sha1)
3540 {
3541 struct diff_filespec *one, *two;
3542
3543 if (options->prefix &&
3544 strncmp(path, options->prefix, options->prefix_length))
3545 return;
3546
3547 one = alloc_filespec(path);
3548 two = alloc_filespec(path);
3549 fill_filespec(one, sha1, mode);
3550 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3551 }