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