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git-svn: make rebuild respect rewriteRoot option
[git/vmiklos.git] / diff.c
blob526249008662d4041e5623914c1a420f3443c4d4
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.renamelimit")) {
135 diff_rename_limit_default = git_config_int(var, value);
136 return 0;
137 }
138 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
139 diff_use_color_default = git_config_colorbool(var, value, -1);
140 return 0;
141 }
142 if (!strcmp(var, "diff.renames")) {
143 if (!value)
144 diff_detect_rename_default = DIFF_DETECT_RENAME;
145 else if (!strcasecmp(value, "copies") ||
146 !strcasecmp(value, "copy"))
147 diff_detect_rename_default = DIFF_DETECT_COPY;
148 else if (git_config_bool(var,value))
149 diff_detect_rename_default = DIFF_DETECT_RENAME;
150 return 0;
151 }
152 if (!strcmp(var, "diff.autorefreshindex")) {
153 diff_auto_refresh_index = git_config_bool(var, value);
154 return 0;
155 }
156 if (!strcmp(var, "diff.external")) {
157 if (!value)
158 return config_error_nonbool(var);
159 external_diff_cmd_cfg = xstrdup(value);
160 return 0;
161 }
162 if (!prefixcmp(var, "diff.")) {
163 const char *ep = strrchr(var, '.');
164
165 if (ep != var + 4 && !strcmp(ep, ".command"))
166 return parse_lldiff_command(var, ep, value);
167 }
168
169 return git_diff_basic_config(var, value, cb);
170 }
171
172 int git_diff_basic_config(const char *var, const char *value, void *cb)
173 {
174 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
175 int slot = parse_diff_color_slot(var, 11);
176 if (!value)
177 return config_error_nonbool(var);
178 color_parse(value, var, diff_colors[slot]);
179 return 0;
180 }
181
182 if (!prefixcmp(var, "diff.")) {
183 const char *ep = strrchr(var, '.');
184 if (ep != var + 4) {
185 if (!strcmp(ep, ".funcname")) {
186 if (!value)
187 return config_error_nonbool(var);
188 return parse_funcname_pattern(var, ep, value);
189 }
190 }
191 }
192
193 return git_color_default_config(var, value, cb);
194 }
195
196 static char *quote_two(const char *one, const char *two)
197 {
198 int need_one = quote_c_style(one, NULL, NULL, 1);
199 int need_two = quote_c_style(two, NULL, NULL, 1);
200 struct strbuf res;
201
202 strbuf_init(&res, 0);
203 if (need_one + need_two) {
204 strbuf_addch(&res, '"');
205 quote_c_style(one, &res, NULL, 1);
206 quote_c_style(two, &res, NULL, 1);
207 strbuf_addch(&res, '"');
208 } else {
209 strbuf_addstr(&res, one);
210 strbuf_addstr(&res, two);
211 }
212 return strbuf_detach(&res, NULL);
213 }
214
215 static const char *external_diff(void)
216 {
217 static const char *external_diff_cmd = NULL;
218 static int done_preparing = 0;
219
220 if (done_preparing)
221 return external_diff_cmd;
222 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
223 if (!external_diff_cmd)
224 external_diff_cmd = external_diff_cmd_cfg;
225 done_preparing = 1;
226 return external_diff_cmd;
227 }
228
229 static struct diff_tempfile {
230 const char *name; /* filename external diff should read from */
231 char hex[41];
232 char mode[10];
233 char tmp_path[PATH_MAX];
234 } diff_temp[2];
235
236 static int count_lines(const char *data, int size)
237 {
238 int count, ch, completely_empty = 1, nl_just_seen = 0;
239 count = 0;
240 while (0 < size--) {
241 ch = *data++;
242 if (ch == '\n') {
243 count++;
244 nl_just_seen = 1;
245 completely_empty = 0;
246 }
247 else {
248 nl_just_seen = 0;
249 completely_empty = 0;
250 }
251 }
252 if (completely_empty)
253 return 0;
254 if (!nl_just_seen)
255 count++; /* no trailing newline */
256 return count;
257 }
258
259 static void print_line_count(FILE *file, int count)
260 {
261 switch (count) {
262 case 0:
263 fprintf(file, "0,0");
264 break;
265 case 1:
266 fprintf(file, "1");
267 break;
268 default:
269 fprintf(file, "1,%d", count);
270 break;
271 }
272 }
273
274 static void copy_file_with_prefix(FILE *file,
275 int prefix, const char *data, int size,
276 const char *set, const char *reset)
277 {
278 int ch, nl_just_seen = 1;
279 while (0 < size--) {
280 ch = *data++;
281 if (nl_just_seen) {
282 fputs(set, file);
283 putc(prefix, file);
284 }
285 if (ch == '\n') {
286 nl_just_seen = 1;
287 fputs(reset, file);
288 } else
289 nl_just_seen = 0;
290 putc(ch, file);
291 }
292 if (!nl_just_seen)
293 fprintf(file, "%s\n\\ No newline at end of file\n", reset);
294 }
295
296 static void emit_rewrite_diff(const char *name_a,
297 const char *name_b,
298 struct diff_filespec *one,
299 struct diff_filespec *two,
300 struct diff_options *o)
301 {
302 int lc_a, lc_b;
303 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
304 const char *name_a_tab, *name_b_tab;
305 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
306 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
307 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
308 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
309 const char *reset = diff_get_color(color_diff, DIFF_RESET);
310 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
311
312 name_a += (*name_a == '/');
313 name_b += (*name_b == '/');
314 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
315 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
316
317 strbuf_reset(&a_name);
318 strbuf_reset(&b_name);
319 quote_two_c_style(&a_name, o->a_prefix, name_a, 0);
320 quote_two_c_style(&b_name, o->b_prefix, name_b, 0);
321
322 diff_populate_filespec(one, 0);
323 diff_populate_filespec(two, 0);
324 lc_a = count_lines(one->data, one->size);
325 lc_b = count_lines(two->data, two->size);
326 fprintf(o->file,
327 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
328 metainfo, a_name.buf, name_a_tab, reset,
329 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
330 print_line_count(o->file, lc_a);
331 fprintf(o->file, " +");
332 print_line_count(o->file, lc_b);
333 fprintf(o->file, " @@%s\n", reset);
334 if (lc_a)
335 copy_file_with_prefix(o->file, '-', one->data, one->size, old, reset);
336 if (lc_b)
337 copy_file_with_prefix(o->file, '+', two->data, two->size, new, reset);
338 }
339
340 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
341 {
342 if (!DIFF_FILE_VALID(one)) {
343 mf->ptr = (char *)""; /* does not matter */
344 mf->size = 0;
345 return 0;
346 }
347 else if (diff_populate_filespec(one, 0))
348 return -1;
349 mf->ptr = one->data;
350 mf->size = one->size;
351 return 0;
352 }
353
354 struct diff_words_buffer {
355 mmfile_t text;
356 long alloc;
357 long current; /* output pointer */
358 int suppressed_newline;
359 };
360
361 static void diff_words_append(char *line, unsigned long len,
362 struct diff_words_buffer *buffer)
363 {
364 if (buffer->text.size + len > buffer->alloc) {
365 buffer->alloc = (buffer->text.size + len) * 3 / 2;
366 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
367 }
368 line++;
369 len--;
370 memcpy(buffer->text.ptr + buffer->text.size, line, len);
371 buffer->text.size += len;
372 }
373
374 struct diff_words_data {
375 struct xdiff_emit_state xm;
376 struct diff_words_buffer minus, plus;
377 FILE *file;
378 };
379
380 static void print_word(FILE *file, struct diff_words_buffer *buffer, int len, int color,
381 int suppress_newline)
382 {
383 const char *ptr;
384 int eol = 0;
385
386 if (len == 0)
387 return;
388
389 ptr = buffer->text.ptr + buffer->current;
390 buffer->current += len;
391
392 if (ptr[len - 1] == '\n') {
393 eol = 1;
394 len--;
395 }
396
397 fputs(diff_get_color(1, color), file);
398 fwrite(ptr, len, 1, file);
399 fputs(diff_get_color(1, DIFF_RESET), file);
400
401 if (eol) {
402 if (suppress_newline)
403 buffer->suppressed_newline = 1;
404 else
405 putc('\n', file);
406 }
407 }
408
409 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
410 {
411 struct diff_words_data *diff_words = priv;
412
413 if (diff_words->minus.suppressed_newline) {
414 if (line[0] != '+')
415 putc('\n', diff_words->file);
416 diff_words->minus.suppressed_newline = 0;
417 }
418
419 len--;
420 switch (line[0]) {
421 case '-':
422 print_word(diff_words->file,
423 &diff_words->minus, len, DIFF_FILE_OLD, 1);
424 break;
425 case '+':
426 print_word(diff_words->file,
427 &diff_words->plus, len, DIFF_FILE_NEW, 0);
428 break;
429 case ' ':
430 print_word(diff_words->file,
431 &diff_words->plus, len, DIFF_PLAIN, 0);
432 diff_words->minus.current += len;
433 break;
434 }
435 }
436
437 /* this executes the word diff on the accumulated buffers */
438 static void diff_words_show(struct diff_words_data *diff_words)
439 {
440 xpparam_t xpp;
441 xdemitconf_t xecfg;
442 xdemitcb_t ecb;
443 mmfile_t minus, plus;
444 int i;
445
446 memset(&xecfg, 0, sizeof(xecfg));
447 minus.size = diff_words->minus.text.size;
448 minus.ptr = xmalloc(minus.size);
449 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
450 for (i = 0; i < minus.size; i++)
451 if (isspace(minus.ptr[i]))
452 minus.ptr[i] = '\n';
453 diff_words->minus.current = 0;
454
455 plus.size = diff_words->plus.text.size;
456 plus.ptr = xmalloc(plus.size);
457 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
458 for (i = 0; i < plus.size; i++)
459 if (isspace(plus.ptr[i]))
460 plus.ptr[i] = '\n';
461 diff_words->plus.current = 0;
462
463 xpp.flags = XDF_NEED_MINIMAL;
464 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
465 ecb.outf = xdiff_outf;
466 ecb.priv = diff_words;
467 diff_words->xm.consume = fn_out_diff_words_aux;
468 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
469
470 free(minus.ptr);
471 free(plus.ptr);
472 diff_words->minus.text.size = diff_words->plus.text.size = 0;
473
474 if (diff_words->minus.suppressed_newline) {
475 putc('\n', diff_words->file);
476 diff_words->minus.suppressed_newline = 0;
477 }
478 }
479
480 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
481
482 struct emit_callback {
483 struct xdiff_emit_state xm;
484 int nparents, color_diff;
485 unsigned ws_rule;
486 sane_truncate_fn truncate;
487 const char **label_path;
488 struct diff_words_data *diff_words;
489 int *found_changesp;
490 FILE *file;
491 };
492
493 static void free_diff_words_data(struct emit_callback *ecbdata)
494 {
495 if (ecbdata->diff_words) {
496 /* flush buffers */
497 if (ecbdata->diff_words->minus.text.size ||
498 ecbdata->diff_words->plus.text.size)
499 diff_words_show(ecbdata->diff_words);
500
501 free (ecbdata->diff_words->minus.text.ptr);
502 free (ecbdata->diff_words->plus.text.ptr);
503 free(ecbdata->diff_words);
504 ecbdata->diff_words = NULL;
505 }
506 }
507
508 const char *diff_get_color(int diff_use_color, enum color_diff ix)
509 {
510 if (diff_use_color)
511 return diff_colors[ix];
512 return "";
513 }
514
515 static void emit_line(FILE *file, const char *set, const char *reset, const char *line, int len)
516 {
517 int has_trailing_newline = (len > 0 && line[len-1] == '\n');
518 if (has_trailing_newline)
519 len--;
520
521 fputs(set, file);
522 fwrite(line, len, 1, file);
523 fputs(reset, file);
524 if (has_trailing_newline)
525 fputc('\n', file);
526 }
527
528 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
529 {
530 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
531 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
532
533 if (!*ws)
534 emit_line(ecbdata->file, set, reset, line, len);
535 else {
536 /* Emit just the prefix, then the rest. */
537 emit_line(ecbdata->file, set, reset, line, ecbdata->nparents);
538 (void)check_and_emit_line(line + ecbdata->nparents,
539 len - ecbdata->nparents, ecbdata->ws_rule,
540 ecbdata->file, set, reset, ws);
541 }
542 }
543
544 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
545 {
546 const char *cp;
547 unsigned long allot;
548 size_t l = len;
549
550 if (ecb->truncate)
551 return ecb->truncate(line, len);
552 cp = line;
553 allot = l;
554 while (0 < l) {
555 (void) utf8_width(&cp, &l);
556 if (!cp)
557 break; /* truncated in the middle? */
558 }
559 return allot - l;
560 }
561
562 static void fn_out_consume(void *priv, char *line, unsigned long len)
563 {
564 int i;
565 int color;
566 struct emit_callback *ecbdata = priv;
567 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
568 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
569 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
570
571 *(ecbdata->found_changesp) = 1;
572
573 if (ecbdata->label_path[0]) {
574 const char *name_a_tab, *name_b_tab;
575
576 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
577 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
578
579 fprintf(ecbdata->file, "%s--- %s%s%s\n",
580 meta, ecbdata->label_path[0], reset, name_a_tab);
581 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
582 meta, ecbdata->label_path[1], reset, name_b_tab);
583 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
584 }
585
586 /* This is not really necessary for now because
587 * this codepath only deals with two-way diffs.
588 */
589 for (i = 0; i < len && line[i] == '@'; i++)
590 ;
591 if (2 <= i && i < len && line[i] == ' ') {
592 ecbdata->nparents = i - 1;
593 len = sane_truncate_line(ecbdata, line, len);
594 emit_line(ecbdata->file,
595 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
596 reset, line, len);
597 if (line[len-1] != '\n')
598 putc('\n', ecbdata->file);
599 return;
600 }
601
602 if (len < ecbdata->nparents) {
603 emit_line(ecbdata->file, reset, reset, line, len);
604 return;
605 }
606
607 color = DIFF_PLAIN;
608 if (ecbdata->diff_words && ecbdata->nparents != 1)
609 /* fall back to normal diff */
610 free_diff_words_data(ecbdata);
611 if (ecbdata->diff_words) {
612 if (line[0] == '-') {
613 diff_words_append(line, len,
614 &ecbdata->diff_words->minus);
615 return;
616 } else if (line[0] == '+') {
617 diff_words_append(line, len,
618 &ecbdata->diff_words->plus);
619 return;
620 }
621 if (ecbdata->diff_words->minus.text.size ||
622 ecbdata->diff_words->plus.text.size)
623 diff_words_show(ecbdata->diff_words);
624 line++;
625 len--;
626 emit_line(ecbdata->file, plain, reset, line, len);
627 return;
628 }
629 for (i = 0; i < ecbdata->nparents && len; i++) {
630 if (line[i] == '-')
631 color = DIFF_FILE_OLD;
632 else if (line[i] == '+')
633 color = DIFF_FILE_NEW;
634 }
635
636 if (color != DIFF_FILE_NEW) {
637 emit_line(ecbdata->file,
638 diff_get_color(ecbdata->color_diff, color),
639 reset, line, len);
640 return;
641 }
642 emit_add_line(reset, ecbdata, line, len);
643 }
644
645 static char *pprint_rename(const char *a, const char *b)
646 {
647 const char *old = a;
648 const char *new = b;
649 struct strbuf name;
650 int pfx_length, sfx_length;
651 int len_a = strlen(a);
652 int len_b = strlen(b);
653 int a_midlen, b_midlen;
654 int qlen_a = quote_c_style(a, NULL, NULL, 0);
655 int qlen_b = quote_c_style(b, NULL, NULL, 0);
656
657 strbuf_init(&name, 0);
658 if (qlen_a || qlen_b) {
659 quote_c_style(a, &name, NULL, 0);
660 strbuf_addstr(&name, " => ");
661 quote_c_style(b, &name, NULL, 0);
662 return strbuf_detach(&name, NULL);
663 }
664
665 /* Find common prefix */
666 pfx_length = 0;
667 while (*old && *new && *old == *new) {
668 if (*old == '/')
669 pfx_length = old - a + 1;
670 old++;
671 new++;
672 }
673
674 /* Find common suffix */
675 old = a + len_a;
676 new = b + len_b;
677 sfx_length = 0;
678 while (a <= old && b <= new && *old == *new) {
679 if (*old == '/')
680 sfx_length = len_a - (old - a);
681 old--;
682 new--;
683 }
684
685 /*
686 * pfx{mid-a => mid-b}sfx
687 * {pfx-a => pfx-b}sfx
688 * pfx{sfx-a => sfx-b}
689 * name-a => name-b
690 */
691 a_midlen = len_a - pfx_length - sfx_length;
692 b_midlen = len_b - pfx_length - sfx_length;
693 if (a_midlen < 0)
694 a_midlen = 0;
695 if (b_midlen < 0)
696 b_midlen = 0;
697
698 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
699 if (pfx_length + sfx_length) {
700 strbuf_add(&name, a, pfx_length);
701 strbuf_addch(&name, '{');
702 }
703 strbuf_add(&name, a + pfx_length, a_midlen);
704 strbuf_addstr(&name, " => ");
705 strbuf_add(&name, b + pfx_length, b_midlen);
706 if (pfx_length + sfx_length) {
707 strbuf_addch(&name, '}');
708 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
709 }
710 return strbuf_detach(&name, NULL);
711 }
712
713 struct diffstat_t {
714 struct xdiff_emit_state xm;
715
716 int nr;
717 int alloc;
718 struct diffstat_file {
719 char *from_name;
720 char *name;
721 char *print_name;
722 unsigned is_unmerged:1;
723 unsigned is_binary:1;
724 unsigned is_renamed:1;
725 unsigned int added, deleted;
726 } **files;
727 };
728
729 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
730 const char *name_a,
731 const char *name_b)
732 {
733 struct diffstat_file *x;
734 x = xcalloc(sizeof (*x), 1);
735 if (diffstat->nr == diffstat->alloc) {
736 diffstat->alloc = alloc_nr(diffstat->alloc);
737 diffstat->files = xrealloc(diffstat->files,
738 diffstat->alloc * sizeof(x));
739 }
740 diffstat->files[diffstat->nr++] = x;
741 if (name_b) {
742 x->from_name = xstrdup(name_a);
743 x->name = xstrdup(name_b);
744 x->is_renamed = 1;
745 }
746 else {
747 x->from_name = NULL;
748 x->name = xstrdup(name_a);
749 }
750 return x;
751 }
752
753 static void diffstat_consume(void *priv, char *line, unsigned long len)
754 {
755 struct diffstat_t *diffstat = priv;
756 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
757
758 if (line[0] == '+')
759 x->added++;
760 else if (line[0] == '-')
761 x->deleted++;
762 }
763
764 const char mime_boundary_leader[] = "------------";
765
766 static int scale_linear(int it, int width, int max_change)
767 {
768 /*
769 * make sure that at least one '-' is printed if there were deletions,
770 * and likewise for '+'.
771 */
772 if (max_change < 2)
773 return it;
774 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
775 }
776
777 static void show_name(FILE *file,
778 const char *prefix, const char *name, int len,
779 const char *reset, const char *set)
780 {
781 fprintf(file, " %s%s%-*s%s |", set, prefix, len, name, reset);
782 }
783
784 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
785 {
786 if (cnt <= 0)
787 return;
788 fprintf(file, "%s", set);
789 while (cnt--)
790 putc(ch, file);
791 fprintf(file, "%s", reset);
792 }
793
794 static void fill_print_name(struct diffstat_file *file)
795 {
796 char *pname;
797
798 if (file->print_name)
799 return;
800
801 if (!file->is_renamed) {
802 struct strbuf buf;
803 strbuf_init(&buf, 0);
804 if (quote_c_style(file->name, &buf, NULL, 0)) {
805 pname = strbuf_detach(&buf, NULL);
806 } else {
807 pname = file->name;
808 strbuf_release(&buf);
809 }
810 } else {
811 pname = pprint_rename(file->from_name, file->name);
812 }
813 file->print_name = pname;
814 }
815
816 static void show_stats(struct diffstat_t* data, struct diff_options *options)
817 {
818 int i, len, add, del, total, adds = 0, dels = 0;
819 int max_change = 0, max_len = 0;
820 int total_files = data->nr;
821 int width, name_width;
822 const char *reset, *set, *add_c, *del_c;
823
824 if (data->nr == 0)
825 return;
826
827 width = options->stat_width ? options->stat_width : 80;
828 name_width = options->stat_name_width ? options->stat_name_width : 50;
829
830 /* Sanity: give at least 5 columns to the graph,
831 * but leave at least 10 columns for the name.
832 */
833 if (width < name_width + 15) {
834 if (name_width <= 25)
835 width = name_width + 15;
836 else
837 name_width = width - 15;
838 }
839
840 /* Find the longest filename and max number of changes */
841 reset = diff_get_color_opt(options, DIFF_RESET);
842 set = diff_get_color_opt(options, DIFF_PLAIN);
843 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
844 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
845
846 for (i = 0; i < data->nr; i++) {
847 struct diffstat_file *file = data->files[i];
848 int change = file->added + file->deleted;
849 fill_print_name(file);
850 len = strlen(file->print_name);
851 if (max_len < len)
852 max_len = len;
853
854 if (file->is_binary || file->is_unmerged)
855 continue;
856 if (max_change < change)
857 max_change = change;
858 }
859
860 /* Compute the width of the graph part;
861 * 10 is for one blank at the beginning of the line plus
862 * " | count " between the name and the graph.
863 *
864 * From here on, name_width is the width of the name area,
865 * and width is the width of the graph area.
866 */
867 name_width = (name_width < max_len) ? name_width : max_len;
868 if (width < (name_width + 10) + max_change)
869 width = width - (name_width + 10);
870 else
871 width = max_change;
872
873 for (i = 0; i < data->nr; i++) {
874 const char *prefix = "";
875 char *name = data->files[i]->print_name;
876 int added = data->files[i]->added;
877 int deleted = data->files[i]->deleted;
878 int name_len;
879
880 /*
881 * "scale" the filename
882 */
883 len = name_width;
884 name_len = strlen(name);
885 if (name_width < name_len) {
886 char *slash;
887 prefix = "...";
888 len -= 3;
889 name += name_len - len;
890 slash = strchr(name, '/');
891 if (slash)
892 name = slash;
893 }
894
895 if (data->files[i]->is_binary) {
896 show_name(options->file, prefix, name, len, reset, set);
897 fprintf(options->file, " Bin ");
898 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
899 fprintf(options->file, " -> ");
900 fprintf(options->file, "%s%d%s", add_c, added, reset);
901 fprintf(options->file, " bytes");
902 fprintf(options->file, "\n");
903 continue;
904 }
905 else if (data->files[i]->is_unmerged) {
906 show_name(options->file, prefix, name, len, reset, set);
907 fprintf(options->file, " Unmerged\n");
908 continue;
909 }
910 else if (!data->files[i]->is_renamed &&
911 (added + deleted == 0)) {
912 total_files--;
913 continue;
914 }
915
916 /*
917 * scale the add/delete
918 */
919 add = added;
920 del = deleted;
921 total = add + del;
922 adds += add;
923 dels += del;
924
925 if (width <= max_change) {
926 add = scale_linear(add, width, max_change);
927 del = scale_linear(del, width, max_change);
928 total = add + del;
929 }
930 show_name(options->file, prefix, name, len, reset, set);
931 fprintf(options->file, "%5d ", added + deleted);
932 show_graph(options->file, '+', add, add_c, reset);
933 show_graph(options->file, '-', del, del_c, reset);
934 fprintf(options->file, "\n");
935 }
936 fprintf(options->file,
937 "%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
938 set, total_files, adds, dels, reset);
939 }
940
941 static void show_shortstats(struct diffstat_t* data, struct diff_options *options)
942 {
943 int i, adds = 0, dels = 0, total_files = data->nr;
944
945 if (data->nr == 0)
946 return;
947
948 for (i = 0; i < data->nr; i++) {
949 if (!data->files[i]->is_binary &&
950 !data->files[i]->is_unmerged) {
951 int added = data->files[i]->added;
952 int deleted= data->files[i]->deleted;
953 if (!data->files[i]->is_renamed &&
954 (added + deleted == 0)) {
955 total_files--;
956 } else {
957 adds += added;
958 dels += deleted;
959 }
960 }
961 }
962 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
963 total_files, adds, dels);
964 }
965
966 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
967 {
968 int i;
969
970 if (data->nr == 0)
971 return;
972
973 for (i = 0; i < data->nr; i++) {
974 struct diffstat_file *file = data->files[i];
975
976 if (file->is_binary)
977 fprintf(options->file, "-\t-\t");
978 else
979 fprintf(options->file,
980 "%d\t%d\t", file->added, file->deleted);
981 if (options->line_termination) {
982 fill_print_name(file);
983 if (!file->is_renamed)
984 write_name_quoted(file->name, options->file,
985 options->line_termination);
986 else {
987 fputs(file->print_name, options->file);
988 putc(options->line_termination, options->file);
989 }
990 } else {
991 if (file->is_renamed) {
992 putc('\0', options->file);
993 write_name_quoted(file->from_name, options->file, '\0');
994 }
995 write_name_quoted(file->name, options->file, '\0');
996 }
997 }
998 }
999
1000 struct dirstat_file {
1001 const char *name;
1002 unsigned long changed;
1003 };
1004
1005 struct dirstat_dir {
1006 struct dirstat_file *files;
1007 int alloc, nr, percent, cumulative;
1008 };
1009
1010 static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
1011 {
1012 unsigned long this_dir = 0;
1013 unsigned int sources = 0;
1014
1015 while (dir->nr) {
1016 struct dirstat_file *f = dir->files;
1017 int namelen = strlen(f->name);
1018 unsigned long this;
1019 char *slash;
1020
1021 if (namelen < baselen)
1022 break;
1023 if (memcmp(f->name, base, baselen))
1024 break;
1025 slash = strchr(f->name + baselen, '/');
1026 if (slash) {
1027 int newbaselen = slash + 1 - f->name;
1028 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
1029 sources++;
1030 } else {
1031 this = f->changed;
1032 dir->files++;
1033 dir->nr--;
1034 sources += 2;
1035 }
1036 this_dir += this;
1037 }
1038
1039 /*
1040 * We don't report dirstat's for
1041 * - the top level
1042 * - or cases where everything came from a single directory
1043 * under this directory (sources == 1).
1044 */
1045 if (baselen && sources != 1) {
1046 int permille = this_dir * 1000 / changed;
1047 if (permille) {
1048 int percent = permille / 10;
1049 if (percent >= dir->percent) {
1050 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1051 if (!dir->cumulative)
1052 return 0;
1053 }
1054 }
1055 }
1056 return this_dir;
1057 }
1058
1059 static void show_dirstat(struct diff_options *options)
1060 {
1061 int i;
1062 unsigned long changed;
1063 struct dirstat_dir dir;
1064 struct diff_queue_struct *q = &diff_queued_diff;
1065
1066 dir.files = NULL;
1067 dir.alloc = 0;
1068 dir.nr = 0;
1069 dir.percent = options->dirstat_percent;
1070 dir.cumulative = options->output_format & DIFF_FORMAT_CUMULATIVE;
1071
1072 changed = 0;
1073 for (i = 0; i < q->nr; i++) {
1074 struct diff_filepair *p = q->queue[i];
1075 const char *name;
1076 unsigned long copied, added, damage;
1077
1078 name = p->one->path ? p->one->path : p->two->path;
1079
1080 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1081 diff_populate_filespec(p->one, 0);
1082 diff_populate_filespec(p->two, 0);
1083 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1084 &copied, &added);
1085 diff_free_filespec_data(p->one);
1086 diff_free_filespec_data(p->two);
1087 } else if (DIFF_FILE_VALID(p->one)) {
1088 diff_populate_filespec(p->one, 1);
1089 copied = added = 0;
1090 diff_free_filespec_data(p->one);
1091 } else if (DIFF_FILE_VALID(p->two)) {
1092 diff_populate_filespec(p->two, 1);
1093 copied = 0;
1094 added = p->two->size;
1095 diff_free_filespec_data(p->two);
1096 } else
1097 continue;
1098
1099 /*
1100 * Original minus copied is the removed material,
1101 * added is the new material. They are both damages
1102 * made to the preimage.
1103 */
1104 damage = (p->one->size - copied) + added;
1105
1106 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1107 dir.files[dir.nr].name = name;
1108 dir.files[dir.nr].changed = damage;
1109 changed += damage;
1110 dir.nr++;
1111 }
1112
1113 /* This can happen even with many files, if everything was renames */
1114 if (!changed)
1115 return;
1116
1117 /* Show all directories with more than x% of the changes */
1118 gather_dirstat(options->file, &dir, changed, "", 0);
1119 }
1120
1121 static void free_diffstat_info(struct diffstat_t *diffstat)
1122 {
1123 int i;
1124 for (i = 0; i < diffstat->nr; i++) {
1125 struct diffstat_file *f = diffstat->files[i];
1126 if (f->name != f->print_name)
1127 free(f->print_name);
1128 free(f->name);
1129 free(f->from_name);
1130 free(f);
1131 }
1132 free(diffstat->files);
1133 }
1134
1135 struct checkdiff_t {
1136 struct xdiff_emit_state xm;
1137 const char *filename;
1138 int lineno, color_diff;
1139 unsigned ws_rule;
1140 unsigned status;
1141 FILE *file;
1142 };
1143
1144 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1145 {
1146 struct checkdiff_t *data = priv;
1147 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
1148 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
1149 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
1150 char *err;
1151
1152 if (line[0] == '+') {
1153 data->lineno++;
1154 data->status = check_and_emit_line(line + 1, len - 1,
1155 data->ws_rule, NULL, NULL, NULL, NULL);
1156 if (!data->status)
1157 return;
1158 err = whitespace_error_string(data->status);
1159 fprintf(data->file, "%s:%d: %s.\n", data->filename, data->lineno, err);
1160 free(err);
1161 emit_line(data->file, set, reset, line, 1);
1162 (void)check_and_emit_line(line + 1, len - 1, data->ws_rule,
1163 data->file, set, reset, ws);
1164 } else if (line[0] == ' ')
1165 data->lineno++;
1166 else if (line[0] == '@') {
1167 char *plus = strchr(line, '+');
1168 if (plus)
1169 data->lineno = strtol(plus, NULL, 10) - 1;
1170 else
1171 die("invalid diff");
1172 }
1173 }
1174
1175 static unsigned char *deflate_it(char *data,
1176 unsigned long size,
1177 unsigned long *result_size)
1178 {
1179 int bound;
1180 unsigned char *deflated;
1181 z_stream stream;
1182
1183 memset(&stream, 0, sizeof(stream));
1184 deflateInit(&stream, zlib_compression_level);
1185 bound = deflateBound(&stream, size);
1186 deflated = xmalloc(bound);
1187 stream.next_out = deflated;
1188 stream.avail_out = bound;
1189
1190 stream.next_in = (unsigned char *)data;
1191 stream.avail_in = size;
1192 while (deflate(&stream, Z_FINISH) == Z_OK)
1193 ; /* nothing */
1194 deflateEnd(&stream);
1195 *result_size = stream.total_out;
1196 return deflated;
1197 }
1198
1199 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
1200 {
1201 void *cp;
1202 void *delta;
1203 void *deflated;
1204 void *data;
1205 unsigned long orig_size;
1206 unsigned long delta_size;
1207 unsigned long deflate_size;
1208 unsigned long data_size;
1209
1210 /* We could do deflated delta, or we could do just deflated two,
1211 * whichever is smaller.
1212 */
1213 delta = NULL;
1214 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1215 if (one->size && two->size) {
1216 delta = diff_delta(one->ptr, one->size,
1217 two->ptr, two->size,
1218 &delta_size, deflate_size);
1219 if (delta) {
1220 void *to_free = delta;
1221 orig_size = delta_size;
1222 delta = deflate_it(delta, delta_size, &delta_size);
1223 free(to_free);
1224 }
1225 }
1226
1227 if (delta && delta_size < deflate_size) {
1228 fprintf(file, "delta %lu\n", orig_size);
1229 free(deflated);
1230 data = delta;
1231 data_size = delta_size;
1232 }
1233 else {
1234 fprintf(file, "literal %lu\n", two->size);
1235 free(delta);
1236 data = deflated;
1237 data_size = deflate_size;
1238 }
1239
1240 /* emit data encoded in base85 */
1241 cp = data;
1242 while (data_size) {
1243 int bytes = (52 < data_size) ? 52 : data_size;
1244 char line[70];
1245 data_size -= bytes;
1246 if (bytes <= 26)
1247 line[0] = bytes + 'A' - 1;
1248 else
1249 line[0] = bytes - 26 + 'a' - 1;
1250 encode_85(line + 1, cp, bytes);
1251 cp = (char *) cp + bytes;
1252 fputs(line, file);
1253 fputc('\n', file);
1254 }
1255 fprintf(file, "\n");
1256 free(data);
1257 }
1258
1259 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
1260 {
1261 fprintf(file, "GIT binary patch\n");
1262 emit_binary_diff_body(file, one, two);
1263 emit_binary_diff_body(file, two, one);
1264 }
1265
1266 static void setup_diff_attr_check(struct git_attr_check *check)
1267 {
1268 static struct git_attr *attr_diff;
1269
1270 if (!attr_diff) {
1271 attr_diff = git_attr("diff", 4);
1272 }
1273 check[0].attr = attr_diff;
1274 }
1275
1276 static void diff_filespec_check_attr(struct diff_filespec *one)
1277 {
1278 struct git_attr_check attr_diff_check;
1279 int check_from_data = 0;
1280
1281 if (one->checked_attr)
1282 return;
1283
1284 setup_diff_attr_check(&attr_diff_check);
1285 one->is_binary = 0;
1286 one->funcname_pattern_ident = NULL;
1287
1288 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1289 const char *value;
1290
1291 /* binaryness */
1292 value = attr_diff_check.value;
1293 if (ATTR_TRUE(value))
1294 ;
1295 else if (ATTR_FALSE(value))
1296 one->is_binary = 1;
1297 else
1298 check_from_data = 1;
1299
1300 /* funcname pattern ident */
1301 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1302 ;
1303 else
1304 one->funcname_pattern_ident = value;
1305 }
1306
1307 if (check_from_data) {
1308 if (!one->data && DIFF_FILE_VALID(one))
1309 diff_populate_filespec(one, 0);
1310
1311 if (one->data)
1312 one->is_binary = buffer_is_binary(one->data, one->size);
1313 }
1314 }
1315
1316 int diff_filespec_is_binary(struct diff_filespec *one)
1317 {
1318 diff_filespec_check_attr(one);
1319 return one->is_binary;
1320 }
1321
1322 static const char *funcname_pattern(const char *ident)
1323 {
1324 struct funcname_pattern *pp;
1325
1326 for (pp = funcname_pattern_list; pp; pp = pp->next)
1327 if (!strcmp(ident, pp->name))
1328 return pp->pattern;
1329 return NULL;
1330 }
1331
1332 static struct builtin_funcname_pattern {
1333 const char *name;
1334 const char *pattern;
1335 } builtin_funcname_pattern[] = {
1336 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1337 "new\\|return\\|switch\\|throw\\|while\\)\n"
1338 "^[ ]*\\(\\([ ]*"
1339 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1340 "[ ]*([^;]*\\)$" },
1341 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1342 };
1343
1344 static const char *diff_funcname_pattern(struct diff_filespec *one)
1345 {
1346 const char *ident, *pattern;
1347 int i;
1348
1349 diff_filespec_check_attr(one);
1350 ident = one->funcname_pattern_ident;
1351
1352 if (!ident)
1353 /*
1354 * If the config file has "funcname.default" defined, that
1355 * regexp is used; otherwise NULL is returned and xemit uses
1356 * the built-in default.
1357 */
1358 return funcname_pattern("default");
1359
1360 /* Look up custom "funcname.$ident" regexp from config. */
1361 pattern = funcname_pattern(ident);
1362 if (pattern)
1363 return pattern;
1364
1365 /*
1366 * And define built-in fallback patterns here. Note that
1367 * these can be overridden by the user's config settings.
1368 */
1369 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1370 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1371 return builtin_funcname_pattern[i].pattern;
1372
1373 return NULL;
1374 }
1375
1376 static void builtin_diff(const char *name_a,
1377 const char *name_b,
1378 struct diff_filespec *one,
1379 struct diff_filespec *two,
1380 const char *xfrm_msg,
1381 struct diff_options *o,
1382 int complete_rewrite)
1383 {
1384 mmfile_t mf1, mf2;
1385 const char *lbl[2];
1386 char *a_one, *b_two;
1387 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1388 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1389
1390 a_one = quote_two(o->a_prefix, name_a + (*name_a == '/'));
1391 b_two = quote_two(o->b_prefix, name_b + (*name_b == '/'));
1392 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1393 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1394 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1395 if (lbl[0][0] == '/') {
1396 /* /dev/null */
1397 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
1398 if (xfrm_msg && xfrm_msg[0])
1399 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1400 }
1401 else if (lbl[1][0] == '/') {
1402 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1403 if (xfrm_msg && xfrm_msg[0])
1404 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1405 }
1406 else {
1407 if (one->mode != two->mode) {
1408 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1409 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
1410 }
1411 if (xfrm_msg && xfrm_msg[0])
1412 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1413 /*
1414 * we do not run diff between different kind
1415 * of objects.
1416 */
1417 if ((one->mode ^ two->mode) & S_IFMT)
1418 goto free_ab_and_return;
1419 if (complete_rewrite) {
1420 emit_rewrite_diff(name_a, name_b, one, two, o);
1421 o->found_changes = 1;
1422 goto free_ab_and_return;
1423 }
1424 }
1425
1426 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1427 die("unable to read files to diff");
1428
1429 if (!DIFF_OPT_TST(o, TEXT) &&
1430 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1431 /* Quite common confusing case */
1432 if (mf1.size == mf2.size &&
1433 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1434 goto free_ab_and_return;
1435 if (DIFF_OPT_TST(o, BINARY))
1436 emit_binary_diff(o->file, &mf1, &mf2);
1437 else
1438 fprintf(o->file, "Binary files %s and %s differ\n",
1439 lbl[0], lbl[1]);
1440 o->found_changes = 1;
1441 }
1442 else {
1443 /* Crazy xdl interfaces.. */
1444 const char *diffopts = getenv("GIT_DIFF_OPTS");
1445 xpparam_t xpp;
1446 xdemitconf_t xecfg;
1447 xdemitcb_t ecb;
1448 struct emit_callback ecbdata;
1449 const char *funcname_pattern;
1450
1451 funcname_pattern = diff_funcname_pattern(one);
1452 if (!funcname_pattern)
1453 funcname_pattern = diff_funcname_pattern(two);
1454
1455 memset(&xecfg, 0, sizeof(xecfg));
1456 memset(&ecbdata, 0, sizeof(ecbdata));
1457 ecbdata.label_path = lbl;
1458 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1459 ecbdata.found_changesp = &o->found_changes;
1460 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1461 ecbdata.file = o->file;
1462 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1463 xecfg.ctxlen = o->context;
1464 xecfg.flags = XDL_EMIT_FUNCNAMES;
1465 if (funcname_pattern)
1466 xdiff_set_find_func(&xecfg, funcname_pattern);
1467 if (!diffopts)
1468 ;
1469 else if (!prefixcmp(diffopts, "--unified="))
1470 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1471 else if (!prefixcmp(diffopts, "-u"))
1472 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1473 ecb.outf = xdiff_outf;
1474 ecb.priv = &ecbdata;
1475 ecbdata.xm.consume = fn_out_consume;
1476 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1477 ecbdata.diff_words =
1478 xcalloc(1, sizeof(struct diff_words_data));
1479 ecbdata.diff_words->file = o->file;
1480 }
1481 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1482 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1483 free_diff_words_data(&ecbdata);
1484 }
1485
1486 free_ab_and_return:
1487 diff_free_filespec_data(one);
1488 diff_free_filespec_data(two);
1489 free(a_one);
1490 free(b_two);
1491 return;
1492 }
1493
1494 static void builtin_diffstat(const char *name_a, const char *name_b,
1495 struct diff_filespec *one,
1496 struct diff_filespec *two,
1497 struct diffstat_t *diffstat,
1498 struct diff_options *o,
1499 int complete_rewrite)
1500 {
1501 mmfile_t mf1, mf2;
1502 struct diffstat_file *data;
1503
1504 data = diffstat_add(diffstat, name_a, name_b);
1505
1506 if (!one || !two) {
1507 data->is_unmerged = 1;
1508 return;
1509 }
1510 if (complete_rewrite) {
1511 diff_populate_filespec(one, 0);
1512 diff_populate_filespec(two, 0);
1513 data->deleted = count_lines(one->data, one->size);
1514 data->added = count_lines(two->data, two->size);
1515 goto free_and_return;
1516 }
1517 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1518 die("unable to read files to diff");
1519
1520 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1521 data->is_binary = 1;
1522 data->added = mf2.size;
1523 data->deleted = mf1.size;
1524 } else {
1525 /* Crazy xdl interfaces.. */
1526 xpparam_t xpp;
1527 xdemitconf_t xecfg;
1528 xdemitcb_t ecb;
1529
1530 memset(&xecfg, 0, sizeof(xecfg));
1531 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1532 ecb.outf = xdiff_outf;
1533 ecb.priv = diffstat;
1534 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1535 }
1536
1537 free_and_return:
1538 diff_free_filespec_data(one);
1539 diff_free_filespec_data(two);
1540 }
1541
1542 static void builtin_checkdiff(const char *name_a, const char *name_b,
1543 const char *attr_path,
1544 struct diff_filespec *one,
1545 struct diff_filespec *two, struct diff_options *o)
1546 {
1547 mmfile_t mf1, mf2;
1548 struct checkdiff_t data;
1549
1550 if (!two)
1551 return;
1552
1553 memset(&data, 0, sizeof(data));
1554 data.xm.consume = checkdiff_consume;
1555 data.filename = name_b ? name_b : name_a;
1556 data.lineno = 0;
1557 data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1558 data.ws_rule = whitespace_rule(attr_path);
1559 data.file = o->file;
1560
1561 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1562 die("unable to read files to diff");
1563
1564 if (diff_filespec_is_binary(two))
1565 goto free_and_return;
1566 else {
1567 /* Crazy xdl interfaces.. */
1568 xpparam_t xpp;
1569 xdemitconf_t xecfg;
1570 xdemitcb_t ecb;
1571
1572 memset(&xecfg, 0, sizeof(xecfg));
1573 xpp.flags = XDF_NEED_MINIMAL;
1574 ecb.outf = xdiff_outf;
1575 ecb.priv = &data;
1576 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1577 }
1578 free_and_return:
1579 diff_free_filespec_data(one);
1580 diff_free_filespec_data(two);
1581 if (data.status)
1582 DIFF_OPT_SET(o, CHECK_FAILED);
1583 }
1584
1585 struct diff_filespec *alloc_filespec(const char *path)
1586 {
1587 int namelen = strlen(path);
1588 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1589
1590 memset(spec, 0, sizeof(*spec));
1591 spec->path = (char *)(spec + 1);
1592 memcpy(spec->path, path, namelen+1);
1593 spec->count = 1;
1594 return spec;
1595 }
1596
1597 void free_filespec(struct diff_filespec *spec)
1598 {
1599 if (!--spec->count) {
1600 diff_free_filespec_data(spec);
1601 free(spec);
1602 }
1603 }
1604
1605 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1606 unsigned short mode)
1607 {
1608 if (mode) {
1609 spec->mode = canon_mode(mode);
1610 hashcpy(spec->sha1, sha1);
1611 spec->sha1_valid = !is_null_sha1(sha1);
1612 }
1613 }
1614
1615 /*
1616 * Given a name and sha1 pair, if the index tells us the file in
1617 * the work tree has that object contents, return true, so that
1618 * prepare_temp_file() does not have to inflate and extract.
1619 */
1620 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1621 {
1622 struct cache_entry *ce;
1623 struct stat st;
1624 int pos, len;
1625
1626 /* We do not read the cache ourselves here, because the
1627 * benchmark with my previous version that always reads cache
1628 * shows that it makes things worse for diff-tree comparing
1629 * two linux-2.6 kernel trees in an already checked out work
1630 * tree. This is because most diff-tree comparisons deal with
1631 * only a small number of files, while reading the cache is
1632 * expensive for a large project, and its cost outweighs the
1633 * savings we get by not inflating the object to a temporary
1634 * file. Practically, this code only helps when we are used
1635 * by diff-cache --cached, which does read the cache before
1636 * calling us.
1637 */
1638 if (!active_cache)
1639 return 0;
1640
1641 /* We want to avoid the working directory if our caller
1642 * doesn't need the data in a normal file, this system
1643 * is rather slow with its stat/open/mmap/close syscalls,
1644 * and the object is contained in a pack file. The pack
1645 * is probably already open and will be faster to obtain
1646 * the data through than the working directory. Loose
1647 * objects however would tend to be slower as they need
1648 * to be individually opened and inflated.
1649 */
1650 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1651 return 0;
1652
1653 len = strlen(name);
1654 pos = cache_name_pos(name, len);
1655 if (pos < 0)
1656 return 0;
1657 ce = active_cache[pos];
1658
1659 /*
1660 * This is not the sha1 we are looking for, or
1661 * unreusable because it is not a regular file.
1662 */
1663 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1664 return 0;
1665
1666 /*
1667 * If ce matches the file in the work tree, we can reuse it.
1668 */
1669 if (ce_uptodate(ce) ||
1670 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1671 return 1;
1672
1673 return 0;
1674 }
1675
1676 static int populate_from_stdin(struct diff_filespec *s)
1677 {
1678 struct strbuf buf;
1679 size_t size = 0;
1680
1681 strbuf_init(&buf, 0);
1682 if (strbuf_read(&buf, 0, 0) < 0)
1683 return error("error while reading from stdin %s",
1684 strerror(errno));
1685
1686 s->should_munmap = 0;
1687 s->data = strbuf_detach(&buf, &size);
1688 s->size = size;
1689 s->should_free = 1;
1690 return 0;
1691 }
1692
1693 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1694 {
1695 int len;
1696 char *data = xmalloc(100);
1697 len = snprintf(data, 100,
1698 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1699 s->data = data;
1700 s->size = len;
1701 s->should_free = 1;
1702 if (size_only) {
1703 s->data = NULL;
1704 free(data);
1705 }
1706 return 0;
1707 }
1708
1709 /*
1710 * While doing rename detection and pickaxe operation, we may need to
1711 * grab the data for the blob (or file) for our own in-core comparison.
1712 * diff_filespec has data and size fields for this purpose.
1713 */
1714 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1715 {
1716 int err = 0;
1717 if (!DIFF_FILE_VALID(s))
1718 die("internal error: asking to populate invalid file.");
1719 if (S_ISDIR(s->mode))
1720 return -1;
1721
1722 if (s->data)
1723 return 0;
1724
1725 if (size_only && 0 < s->size)
1726 return 0;
1727
1728 if (S_ISGITLINK(s->mode))
1729 return diff_populate_gitlink(s, size_only);
1730
1731 if (!s->sha1_valid ||
1732 reuse_worktree_file(s->path, s->sha1, 0)) {
1733 struct strbuf buf;
1734 struct stat st;
1735 int fd;
1736
1737 if (!strcmp(s->path, "-"))
1738 return populate_from_stdin(s);
1739
1740 if (lstat(s->path, &st) < 0) {
1741 if (errno == ENOENT) {
1742 err_empty:
1743 err = -1;
1744 empty:
1745 s->data = (char *)"";
1746 s->size = 0;
1747 return err;
1748 }
1749 }
1750 s->size = xsize_t(st.st_size);
1751 if (!s->size)
1752 goto empty;
1753 if (size_only)
1754 return 0;
1755 if (S_ISLNK(st.st_mode)) {
1756 int ret;
1757 s->data = xmalloc(s->size);
1758 s->should_free = 1;
1759 ret = readlink(s->path, s->data, s->size);
1760 if (ret < 0) {
1761 free(s->data);
1762 goto err_empty;
1763 }
1764 return 0;
1765 }
1766 fd = open(s->path, O_RDONLY);
1767 if (fd < 0)
1768 goto err_empty;
1769 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1770 close(fd);
1771 s->should_munmap = 1;
1772
1773 /*
1774 * Convert from working tree format to canonical git format
1775 */
1776 strbuf_init(&buf, 0);
1777 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
1778 size_t size = 0;
1779 munmap(s->data, s->size);
1780 s->should_munmap = 0;
1781 s->data = strbuf_detach(&buf, &size);
1782 s->size = size;
1783 s->should_free = 1;
1784 }
1785 }
1786 else {
1787 enum object_type type;
1788 if (size_only)
1789 type = sha1_object_info(s->sha1, &s->size);
1790 else {
1791 s->data = read_sha1_file(s->sha1, &type, &s->size);
1792 s->should_free = 1;
1793 }
1794 }
1795 return 0;
1796 }
1797
1798 void diff_free_filespec_blob(struct diff_filespec *s)
1799 {
1800 if (s->should_free)
1801 free(s->data);
1802 else if (s->should_munmap)
1803 munmap(s->data, s->size);
1804
1805 if (s->should_free || s->should_munmap) {
1806 s->should_free = s->should_munmap = 0;
1807 s->data = NULL;
1808 }
1809 }
1810
1811 void diff_free_filespec_data(struct diff_filespec *s)
1812 {
1813 diff_free_filespec_blob(s);
1814 free(s->cnt_data);
1815 s->cnt_data = NULL;
1816 }
1817
1818 static void prep_temp_blob(struct diff_tempfile *temp,
1819 void *blob,
1820 unsigned long size,
1821 const unsigned char *sha1,
1822 int mode)
1823 {
1824 int fd;
1825
1826 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1827 if (fd < 0)
1828 die("unable to create temp-file: %s", strerror(errno));
1829 if (write_in_full(fd, blob, size) != size)
1830 die("unable to write temp-file");
1831 close(fd);
1832 temp->name = temp->tmp_path;
1833 strcpy(temp->hex, sha1_to_hex(sha1));
1834 temp->hex[40] = 0;
1835 sprintf(temp->mode, "%06o", mode);
1836 }
1837
1838 static void prepare_temp_file(const char *name,
1839 struct diff_tempfile *temp,
1840 struct diff_filespec *one)
1841 {
1842 if (!DIFF_FILE_VALID(one)) {
1843 not_a_valid_file:
1844 /* A '-' entry produces this for file-2, and
1845 * a '+' entry produces this for file-1.
1846 */
1847 temp->name = "/dev/null";
1848 strcpy(temp->hex, ".");
1849 strcpy(temp->mode, ".");
1850 return;
1851 }
1852
1853 if (!one->sha1_valid ||
1854 reuse_worktree_file(name, one->sha1, 1)) {
1855 struct stat st;
1856 if (lstat(name, &st) < 0) {
1857 if (errno == ENOENT)
1858 goto not_a_valid_file;
1859 die("stat(%s): %s", name, strerror(errno));
1860 }
1861 if (S_ISLNK(st.st_mode)) {
1862 int ret;
1863 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1864 size_t sz = xsize_t(st.st_size);
1865 if (sizeof(buf) <= st.st_size)
1866 die("symlink too long: %s", name);
1867 ret = readlink(name, buf, sz);
1868 if (ret < 0)
1869 die("readlink(%s)", name);
1870 prep_temp_blob(temp, buf, sz,
1871 (one->sha1_valid ?
1872 one->sha1 : null_sha1),
1873 (one->sha1_valid ?
1874 one->mode : S_IFLNK));
1875 }
1876 else {
1877 /* we can borrow from the file in the work tree */
1878 temp->name = name;
1879 if (!one->sha1_valid)
1880 strcpy(temp->hex, sha1_to_hex(null_sha1));
1881 else
1882 strcpy(temp->hex, sha1_to_hex(one->sha1));
1883 /* Even though we may sometimes borrow the
1884 * contents from the work tree, we always want
1885 * one->mode. mode is trustworthy even when
1886 * !(one->sha1_valid), as long as
1887 * DIFF_FILE_VALID(one).
1888 */
1889 sprintf(temp->mode, "%06o", one->mode);
1890 }
1891 return;
1892 }
1893 else {
1894 if (diff_populate_filespec(one, 0))
1895 die("cannot read data blob for %s", one->path);
1896 prep_temp_blob(temp, one->data, one->size,
1897 one->sha1, one->mode);
1898 }
1899 }
1900
1901 static void remove_tempfile(void)
1902 {
1903 int i;
1904
1905 for (i = 0; i < 2; i++)
1906 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1907 unlink(diff_temp[i].name);
1908 diff_temp[i].name = NULL;
1909 }
1910 }
1911
1912 static void remove_tempfile_on_signal(int signo)
1913 {
1914 remove_tempfile();
1915 signal(SIGINT, SIG_DFL);
1916 raise(signo);
1917 }
1918
1919 /* An external diff command takes:
1920 *
1921 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1922 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1923 *
1924 */
1925 static void run_external_diff(const char *pgm,
1926 const char *name,
1927 const char *other,
1928 struct diff_filespec *one,
1929 struct diff_filespec *two,
1930 const char *xfrm_msg,
1931 int complete_rewrite)
1932 {
1933 const char *spawn_arg[10];
1934 struct diff_tempfile *temp = diff_temp;
1935 int retval;
1936 static int atexit_asked = 0;
1937 const char *othername;
1938 const char **arg = &spawn_arg[0];
1939
1940 othername = (other? other : name);
1941 if (one && two) {
1942 prepare_temp_file(name, &temp[0], one);
1943 prepare_temp_file(othername, &temp[1], two);
1944 if (! atexit_asked &&
1945 (temp[0].name == temp[0].tmp_path ||
1946 temp[1].name == temp[1].tmp_path)) {
1947 atexit_asked = 1;
1948 atexit(remove_tempfile);
1949 }
1950 signal(SIGINT, remove_tempfile_on_signal);
1951 }
1952
1953 if (one && two) {
1954 *arg++ = pgm;
1955 *arg++ = name;
1956 *arg++ = temp[0].name;
1957 *arg++ = temp[0].hex;
1958 *arg++ = temp[0].mode;
1959 *arg++ = temp[1].name;
1960 *arg++ = temp[1].hex;
1961 *arg++ = temp[1].mode;
1962 if (other) {
1963 *arg++ = other;
1964 *arg++ = xfrm_msg;
1965 }
1966 } else {
1967 *arg++ = pgm;
1968 *arg++ = name;
1969 }
1970 *arg = NULL;
1971 fflush(NULL);
1972 retval = run_command_v_opt(spawn_arg, 0);
1973 remove_tempfile();
1974 if (retval) {
1975 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1976 exit(1);
1977 }
1978 }
1979
1980 static const char *external_diff_attr(const char *name)
1981 {
1982 struct git_attr_check attr_diff_check;
1983
1984 if (!name)
1985 return NULL;
1986
1987 setup_diff_attr_check(&attr_diff_check);
1988 if (!git_checkattr(name, 1, &attr_diff_check)) {
1989 const char *value = attr_diff_check.value;
1990 if (!ATTR_TRUE(value) &&
1991 !ATTR_FALSE(value) &&
1992 !ATTR_UNSET(value)) {
1993 struct ll_diff_driver *drv;
1994
1995 for (drv = user_diff; drv; drv = drv->next)
1996 if (!strcmp(drv->name, value))
1997 return drv->cmd;
1998 }
1999 }
2000 return NULL;
2001 }
2002
2003 static void run_diff_cmd(const char *pgm,
2004 const char *name,
2005 const char *other,
2006 const char *attr_path,
2007 struct diff_filespec *one,
2008 struct diff_filespec *two,
2009 const char *xfrm_msg,
2010 struct diff_options *o,
2011 int complete_rewrite)
2012 {
2013 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2014 pgm = NULL;
2015 else {
2016 const char *cmd = external_diff_attr(attr_path);
2017 if (cmd)
2018 pgm = cmd;
2019 }
2020
2021 if (pgm) {
2022 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2023 complete_rewrite);
2024 return;
2025 }
2026 if (one && two)
2027 builtin_diff(name, other ? other : name,
2028 one, two, xfrm_msg, o, complete_rewrite);
2029 else
2030 fprintf(o->file, "* Unmerged path %s\n", name);
2031 }
2032
2033 static void diff_fill_sha1_info(struct diff_filespec *one)
2034 {
2035 if (DIFF_FILE_VALID(one)) {
2036 if (!one->sha1_valid) {
2037 struct stat st;
2038 if (!strcmp(one->path, "-")) {
2039 hashcpy(one->sha1, null_sha1);
2040 return;
2041 }
2042 if (lstat(one->path, &st) < 0)
2043 die("stat %s", one->path);
2044 if (index_path(one->sha1, one->path, &st, 0))
2045 die("cannot hash %s\n", one->path);
2046 }
2047 }
2048 else
2049 hashclr(one->sha1);
2050 }
2051
2052 static int similarity_index(struct diff_filepair *p)
2053 {
2054 return p->score * 100 / MAX_SCORE;
2055 }
2056
2057 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2058 {
2059 /* Strip the prefix but do not molest /dev/null and absolute paths */
2060 if (*namep && **namep != '/')
2061 *namep += prefix_length;
2062 if (*otherp && **otherp != '/')
2063 *otherp += prefix_length;
2064 }
2065
2066 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2067 {
2068 const char *pgm = external_diff();
2069 struct strbuf msg;
2070 char *xfrm_msg;
2071 struct diff_filespec *one = p->one;
2072 struct diff_filespec *two = p->two;
2073 const char *name;
2074 const char *other;
2075 const char *attr_path;
2076 int complete_rewrite = 0;
2077
2078 name = p->one->path;
2079 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2080 attr_path = name;
2081 if (o->prefix_length)
2082 strip_prefix(o->prefix_length, &name, &other);
2083
2084 if (DIFF_PAIR_UNMERGED(p)) {
2085 run_diff_cmd(pgm, name, NULL, attr_path,
2086 NULL, NULL, NULL, o, 0);
2087 return;
2088 }
2089
2090 diff_fill_sha1_info(one);
2091 diff_fill_sha1_info(two);
2092
2093 strbuf_init(&msg, PATH_MAX * 2 + 300);
2094 switch (p->status) {
2095 case DIFF_STATUS_COPIED:
2096 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2097 strbuf_addstr(&msg, "\ncopy from ");
2098 quote_c_style(name, &msg, NULL, 0);
2099 strbuf_addstr(&msg, "\ncopy to ");
2100 quote_c_style(other, &msg, NULL, 0);
2101 strbuf_addch(&msg, '\n');
2102 break;
2103 case DIFF_STATUS_RENAMED:
2104 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2105 strbuf_addstr(&msg, "\nrename from ");
2106 quote_c_style(name, &msg, NULL, 0);
2107 strbuf_addstr(&msg, "\nrename to ");
2108 quote_c_style(other, &msg, NULL, 0);
2109 strbuf_addch(&msg, '\n');
2110 break;
2111 case DIFF_STATUS_MODIFIED:
2112 if (p->score) {
2113 strbuf_addf(&msg, "dissimilarity index %d%%\n",
2114 similarity_index(p));
2115 complete_rewrite = 1;
2116 break;
2117 }
2118 /* fallthru */
2119 default:
2120 /* nothing */
2121 ;
2122 }
2123
2124 if (hashcmp(one->sha1, two->sha1)) {
2125 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2126
2127 if (DIFF_OPT_TST(o, BINARY)) {
2128 mmfile_t mf;
2129 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2130 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2131 abbrev = 40;
2132 }
2133 strbuf_addf(&msg, "index %.*s..%.*s",
2134 abbrev, sha1_to_hex(one->sha1),
2135 abbrev, sha1_to_hex(two->sha1));
2136 if (one->mode == two->mode)
2137 strbuf_addf(&msg, " %06o", one->mode);
2138 strbuf_addch(&msg, '\n');
2139 }
2140
2141 if (msg.len)
2142 strbuf_setlen(&msg, msg.len - 1);
2143 xfrm_msg = msg.len ? msg.buf : NULL;
2144
2145 if (!pgm &&
2146 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2147 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2148 /* a filepair that changes between file and symlink
2149 * needs to be split into deletion and creation.
2150 */
2151 struct diff_filespec *null = alloc_filespec(two->path);
2152 run_diff_cmd(NULL, name, other, attr_path,
2153 one, null, xfrm_msg, o, 0);
2154 free(null);
2155 null = alloc_filespec(one->path);
2156 run_diff_cmd(NULL, name, other, attr_path,
2157 null, two, xfrm_msg, o, 0);
2158 free(null);
2159 }
2160 else
2161 run_diff_cmd(pgm, name, other, attr_path,
2162 one, two, xfrm_msg, o, complete_rewrite);
2163
2164 strbuf_release(&msg);
2165 }
2166
2167 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2168 struct diffstat_t *diffstat)
2169 {
2170 const char *name;
2171 const char *other;
2172 int complete_rewrite = 0;
2173
2174 if (DIFF_PAIR_UNMERGED(p)) {
2175 /* unmerged */
2176 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2177 return;
2178 }
2179
2180 name = p->one->path;
2181 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2182
2183 if (o->prefix_length)
2184 strip_prefix(o->prefix_length, &name, &other);
2185
2186 diff_fill_sha1_info(p->one);
2187 diff_fill_sha1_info(p->two);
2188
2189 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2190 complete_rewrite = 1;
2191 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2192 }
2193
2194 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2195 {
2196 const char *name;
2197 const char *other;
2198 const char *attr_path;
2199
2200 if (DIFF_PAIR_UNMERGED(p)) {
2201 /* unmerged */
2202 return;
2203 }
2204
2205 name = p->one->path;
2206 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2207 attr_path = other ? other : name;
2208
2209 if (o->prefix_length)
2210 strip_prefix(o->prefix_length, &name, &other);
2211
2212 diff_fill_sha1_info(p->one);
2213 diff_fill_sha1_info(p->two);
2214
2215 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2216 }
2217
2218 void diff_setup(struct diff_options *options)
2219 {
2220 memset(options, 0, sizeof(*options));
2221
2222 options->file = stdout;
2223
2224 options->line_termination = '\n';
2225 options->break_opt = -1;
2226 options->rename_limit = -1;
2227 options->dirstat_percent = 3;
2228 options->context = 3;
2229
2230 options->change = diff_change;
2231 options->add_remove = diff_addremove;
2232 if (diff_use_color_default > 0)
2233 DIFF_OPT_SET(options, COLOR_DIFF);
2234 else
2235 DIFF_OPT_CLR(options, COLOR_DIFF);
2236 options->detect_rename = diff_detect_rename_default;
2237
2238 options->a_prefix = "a/";
2239 options->b_prefix = "b/";
2240 }
2241
2242 int diff_setup_done(struct diff_options *options)
2243 {
2244 int count = 0;
2245
2246 if (options->output_format & DIFF_FORMAT_NAME)
2247 count++;
2248 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2249 count++;
2250 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2251 count++;
2252 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2253 count++;
2254 if (count > 1)
2255 die("--name-only, --name-status, --check and -s are mutually exclusive");
2256
2257 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2258 options->detect_rename = DIFF_DETECT_COPY;
2259
2260 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2261 options->prefix = NULL;
2262 if (options->prefix)
2263 options->prefix_length = strlen(options->prefix);
2264 else
2265 options->prefix_length = 0;
2266
2267 if (options->output_format & (DIFF_FORMAT_NAME |
2268 DIFF_FORMAT_NAME_STATUS |
2269 DIFF_FORMAT_CHECKDIFF |
2270 DIFF_FORMAT_NO_OUTPUT))
2271 options->output_format &= ~(DIFF_FORMAT_RAW |
2272 DIFF_FORMAT_NUMSTAT |
2273 DIFF_FORMAT_DIFFSTAT |
2274 DIFF_FORMAT_SHORTSTAT |
2275 DIFF_FORMAT_DIRSTAT |
2276 DIFF_FORMAT_SUMMARY |
2277 DIFF_FORMAT_PATCH);
2278
2279 /*
2280 * These cases always need recursive; we do not drop caller-supplied
2281 * recursive bits for other formats here.
2282 */
2283 if (options->output_format & (DIFF_FORMAT_PATCH |
2284 DIFF_FORMAT_NUMSTAT |
2285 DIFF_FORMAT_DIFFSTAT |
2286 DIFF_FORMAT_SHORTSTAT |
2287 DIFF_FORMAT_DIRSTAT |
2288 DIFF_FORMAT_SUMMARY |
2289 DIFF_FORMAT_CHECKDIFF))
2290 DIFF_OPT_SET(options, RECURSIVE);
2291 /*
2292 * Also pickaxe would not work very well if you do not say recursive
2293 */
2294 if (options->pickaxe)
2295 DIFF_OPT_SET(options, RECURSIVE);
2296
2297 if (options->detect_rename && options->rename_limit < 0)
2298 options->rename_limit = diff_rename_limit_default;
2299 if (options->setup & DIFF_SETUP_USE_CACHE) {
2300 if (!active_cache)
2301 /* read-cache does not die even when it fails
2302 * so it is safe for us to do this here. Also
2303 * it does not smudge active_cache or active_nr
2304 * when it fails, so we do not have to worry about
2305 * cleaning it up ourselves either.
2306 */
2307 read_cache();
2308 }
2309 if (options->abbrev <= 0 || 40 < options->abbrev)
2310 options->abbrev = 40; /* full */
2311
2312 /*
2313 * It does not make sense to show the first hit we happened
2314 * to have found. It does not make sense not to return with
2315 * exit code in such a case either.
2316 */
2317 if (DIFF_OPT_TST(options, QUIET)) {
2318 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2319 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2320 }
2321
2322 /*
2323 * If we postprocess in diffcore, we cannot simply return
2324 * upon the first hit. We need to run diff as usual.
2325 */
2326 if (options->pickaxe || options->filter)
2327 DIFF_OPT_CLR(options, QUIET);
2328
2329 return 0;
2330 }
2331
2332 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2333 {
2334 char c, *eq;
2335 int len;
2336
2337 if (*arg != '-')
2338 return 0;
2339 c = *++arg;
2340 if (!c)
2341 return 0;
2342 if (c == arg_short) {
2343 c = *++arg;
2344 if (!c)
2345 return 1;
2346 if (val && isdigit(c)) {
2347 char *end;
2348 int n = strtoul(arg, &end, 10);
2349 if (*end)
2350 return 0;
2351 *val = n;
2352 return 1;
2353 }
2354 return 0;
2355 }
2356 if (c != '-')
2357 return 0;
2358 arg++;
2359 eq = strchr(arg, '=');
2360 if (eq)
2361 len = eq - arg;
2362 else
2363 len = strlen(arg);
2364 if (!len || strncmp(arg, arg_long, len))
2365 return 0;
2366 if (eq) {
2367 int n;
2368 char *end;
2369 if (!isdigit(*++eq))
2370 return 0;
2371 n = strtoul(eq, &end, 10);
2372 if (*end)
2373 return 0;
2374 *val = n;
2375 }
2376 return 1;
2377 }
2378
2379 static int diff_scoreopt_parse(const char *opt);
2380
2381 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2382 {
2383 const char *arg = av[0];
2384
2385 /* Output format options */
2386 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2387 options->output_format |= DIFF_FORMAT_PATCH;
2388 else if (opt_arg(arg, 'U', "unified", &options->context))
2389 options->output_format |= DIFF_FORMAT_PATCH;
2390 else if (!strcmp(arg, "--raw"))
2391 options->output_format |= DIFF_FORMAT_RAW;
2392 else if (!strcmp(arg, "--patch-with-raw"))
2393 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2394 else if (!strcmp(arg, "--numstat"))
2395 options->output_format |= DIFF_FORMAT_NUMSTAT;
2396 else if (!strcmp(arg, "--shortstat"))
2397 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2398 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2399 options->output_format |= DIFF_FORMAT_DIRSTAT;
2400 else if (!strcmp(arg, "--cumulative"))
2401 options->output_format |= DIFF_FORMAT_CUMULATIVE;
2402 else if (!strcmp(arg, "--check"))
2403 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2404 else if (!strcmp(arg, "--summary"))
2405 options->output_format |= DIFF_FORMAT_SUMMARY;
2406 else if (!strcmp(arg, "--patch-with-stat"))
2407 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2408 else if (!strcmp(arg, "--name-only"))
2409 options->output_format |= DIFF_FORMAT_NAME;
2410 else if (!strcmp(arg, "--name-status"))
2411 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2412 else if (!strcmp(arg, "-s"))
2413 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2414 else if (!prefixcmp(arg, "--stat")) {
2415 char *end;
2416 int width = options->stat_width;
2417 int name_width = options->stat_name_width;
2418 arg += 6;
2419 end = (char *)arg;
2420
2421 switch (*arg) {
2422 case '-':
2423 if (!prefixcmp(arg, "-width="))
2424 width = strtoul(arg + 7, &end, 10);
2425 else if (!prefixcmp(arg, "-name-width="))
2426 name_width = strtoul(arg + 12, &end, 10);
2427 break;
2428 case '=':
2429 width = strtoul(arg+1, &end, 10);
2430 if (*end == ',')
2431 name_width = strtoul(end+1, &end, 10);
2432 }
2433
2434 /* Important! This checks all the error cases! */
2435 if (*end)
2436 return 0;
2437 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2438 options->stat_name_width = name_width;
2439 options->stat_width = width;
2440 }
2441
2442 /* renames options */
2443 else if (!prefixcmp(arg, "-B")) {
2444 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2445 return -1;
2446 }
2447 else if (!prefixcmp(arg, "-M")) {
2448 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2449 return -1;
2450 options->detect_rename = DIFF_DETECT_RENAME;
2451 }
2452 else if (!prefixcmp(arg, "-C")) {
2453 if (options->detect_rename == DIFF_DETECT_COPY)
2454 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2455 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2456 return -1;
2457 options->detect_rename = DIFF_DETECT_COPY;
2458 }
2459 else if (!strcmp(arg, "--no-renames"))
2460 options->detect_rename = 0;
2461 else if (!strcmp(arg, "--relative"))
2462 DIFF_OPT_SET(options, RELATIVE_NAME);
2463 else if (!prefixcmp(arg, "--relative=")) {
2464 DIFF_OPT_SET(options, RELATIVE_NAME);
2465 options->prefix = arg + 11;
2466 }
2467
2468 /* xdiff options */
2469 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2470 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2471 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2472 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2473 else if (!strcmp(arg, "--ignore-space-at-eol"))
2474 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2475
2476 /* flags options */
2477 else if (!strcmp(arg, "--binary")) {
2478 options->output_format |= DIFF_FORMAT_PATCH;
2479 DIFF_OPT_SET(options, BINARY);
2480 }
2481 else if (!strcmp(arg, "--full-index"))
2482 DIFF_OPT_SET(options, FULL_INDEX);
2483 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2484 DIFF_OPT_SET(options, TEXT);
2485 else if (!strcmp(arg, "-R"))
2486 DIFF_OPT_SET(options, REVERSE_DIFF);
2487 else if (!strcmp(arg, "--find-copies-harder"))
2488 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2489 else if (!strcmp(arg, "--follow"))
2490 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2491 else if (!strcmp(arg, "--color"))
2492 DIFF_OPT_SET(options, COLOR_DIFF);
2493 else if (!strcmp(arg, "--no-color"))
2494 DIFF_OPT_CLR(options, COLOR_DIFF);
2495 else if (!strcmp(arg, "--color-words"))
2496 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2497 else if (!strcmp(arg, "--exit-code"))
2498 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2499 else if (!strcmp(arg, "--quiet"))
2500 DIFF_OPT_SET(options, QUIET);
2501 else if (!strcmp(arg, "--ext-diff"))
2502 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2503 else if (!strcmp(arg, "--no-ext-diff"))
2504 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2505 else if (!strcmp(arg, "--ignore-submodules"))
2506 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2507
2508 /* misc options */
2509 else if (!strcmp(arg, "-z"))
2510 options->line_termination = 0;
2511 else if (!prefixcmp(arg, "-l"))
2512 options->rename_limit = strtoul(arg+2, NULL, 10);
2513 else if (!prefixcmp(arg, "-S"))
2514 options->pickaxe = arg + 2;
2515 else if (!strcmp(arg, "--pickaxe-all"))
2516 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2517 else if (!strcmp(arg, "--pickaxe-regex"))
2518 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2519 else if (!prefixcmp(arg, "-O"))
2520 options->orderfile = arg + 2;
2521 else if (!prefixcmp(arg, "--diff-filter="))
2522 options->filter = arg + 14;
2523 else if (!strcmp(arg, "--abbrev"))
2524 options->abbrev = DEFAULT_ABBREV;
2525 else if (!prefixcmp(arg, "--abbrev=")) {
2526 options->abbrev = strtoul(arg + 9, NULL, 10);
2527 if (options->abbrev < MINIMUM_ABBREV)
2528 options->abbrev = MINIMUM_ABBREV;
2529 else if (40 < options->abbrev)
2530 options->abbrev = 40;
2531 }
2532 else if (!prefixcmp(arg, "--src-prefix="))
2533 options->a_prefix = arg + 13;
2534 else if (!prefixcmp(arg, "--dst-prefix="))
2535 options->b_prefix = arg + 13;
2536 else if (!strcmp(arg, "--no-prefix"))
2537 options->a_prefix = options->b_prefix = "";
2538 else if (!prefixcmp(arg, "--output=")) {
2539 options->file = fopen(arg + strlen("--output="), "w");
2540 options->close_file = 1;
2541 } else
2542 return 0;
2543 return 1;
2544 }
2545
2546 static int parse_num(const char **cp_p)
2547 {
2548 unsigned long num, scale;
2549 int ch, dot;
2550 const char *cp = *cp_p;
2551
2552 num = 0;
2553 scale = 1;
2554 dot = 0;
2555 for(;;) {
2556 ch = *cp;
2557 if ( !dot && ch == '.' ) {
2558 scale = 1;
2559 dot = 1;
2560 } else if ( ch == '%' ) {
2561 scale = dot ? scale*100 : 100;
2562 cp++; /* % is always at the end */
2563 break;
2564 } else if ( ch >= '0' && ch <= '9' ) {
2565 if ( scale < 100000 ) {
2566 scale *= 10;
2567 num = (num*10) + (ch-'0');
2568 }
2569 } else {
2570 break;
2571 }
2572 cp++;
2573 }
2574 *cp_p = cp;
2575
2576 /* user says num divided by scale and we say internally that
2577 * is MAX_SCORE * num / scale.
2578 */
2579 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2580 }
2581
2582 static int diff_scoreopt_parse(const char *opt)
2583 {
2584 int opt1, opt2, cmd;
2585
2586 if (*opt++ != '-')
2587 return -1;
2588 cmd = *opt++;
2589 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2590 return -1; /* that is not a -M, -C nor -B option */
2591
2592 opt1 = parse_num(&opt);
2593 if (cmd != 'B')
2594 opt2 = 0;
2595 else {
2596 if (*opt == 0)
2597 opt2 = 0;
2598 else if (*opt != '/')
2599 return -1; /* we expect -B80/99 or -B80 */
2600 else {
2601 opt++;
2602 opt2 = parse_num(&opt);
2603 }
2604 }
2605 if (*opt != 0)
2606 return -1;
2607 return opt1 | (opt2 << 16);
2608 }
2609
2610 struct diff_queue_struct diff_queued_diff;
2611
2612 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2613 {
2614 if (queue->alloc <= queue->nr) {
2615 queue->alloc = alloc_nr(queue->alloc);
2616 queue->queue = xrealloc(queue->queue,
2617 sizeof(dp) * queue->alloc);
2618 }
2619 queue->queue[queue->nr++] = dp;
2620 }
2621
2622 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2623 struct diff_filespec *one,
2624 struct diff_filespec *two)
2625 {
2626 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2627 dp->one = one;
2628 dp->two = two;
2629 if (queue)
2630 diff_q(queue, dp);
2631 return dp;
2632 }
2633
2634 void diff_free_filepair(struct diff_filepair *p)
2635 {
2636 free_filespec(p->one);
2637 free_filespec(p->two);
2638 free(p);
2639 }
2640
2641 /* This is different from find_unique_abbrev() in that
2642 * it stuffs the result with dots for alignment.
2643 */
2644 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2645 {
2646 int abblen;
2647 const char *abbrev;
2648 if (len == 40)
2649 return sha1_to_hex(sha1);
2650
2651 abbrev = find_unique_abbrev(sha1, len);
2652 abblen = strlen(abbrev);
2653 if (abblen < 37) {
2654 static char hex[41];
2655 if (len < abblen && abblen <= len + 2)
2656 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2657 else
2658 sprintf(hex, "%s...", abbrev);
2659 return hex;
2660 }
2661 return sha1_to_hex(sha1);
2662 }
2663
2664 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2665 {
2666 int line_termination = opt->line_termination;
2667 int inter_name_termination = line_termination ? '\t' : '\0';
2668
2669 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2670 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2671 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2672 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2673 }
2674 if (p->score) {
2675 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2676 inter_name_termination);
2677 } else {
2678 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
2679 }
2680
2681 if (p->status == DIFF_STATUS_COPIED ||
2682 p->status == DIFF_STATUS_RENAMED) {
2683 const char *name_a, *name_b;
2684 name_a = p->one->path;
2685 name_b = p->two->path;
2686 strip_prefix(opt->prefix_length, &name_a, &name_b);
2687 write_name_quoted(name_a, opt->file, inter_name_termination);
2688 write_name_quoted(name_b, opt->file, line_termination);
2689 } else {
2690 const char *name_a, *name_b;
2691 name_a = p->one->mode ? p->one->path : p->two->path;
2692 name_b = NULL;
2693 strip_prefix(opt->prefix_length, &name_a, &name_b);
2694 write_name_quoted(name_a, opt->file, line_termination);
2695 }
2696 }
2697
2698 int diff_unmodified_pair(struct diff_filepair *p)
2699 {
2700 /* This function is written stricter than necessary to support
2701 * the currently implemented transformers, but the idea is to
2702 * let transformers to produce diff_filepairs any way they want,
2703 * and filter and clean them up here before producing the output.
2704 */
2705 struct diff_filespec *one = p->one, *two = p->two;
2706
2707 if (DIFF_PAIR_UNMERGED(p))
2708 return 0; /* unmerged is interesting */
2709
2710 /* deletion, addition, mode or type change
2711 * and rename are all interesting.
2712 */
2713 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2714 DIFF_PAIR_MODE_CHANGED(p) ||
2715 strcmp(one->path, two->path))
2716 return 0;
2717
2718 /* both are valid and point at the same path. that is, we are
2719 * dealing with a change.
2720 */
2721 if (one->sha1_valid && two->sha1_valid &&
2722 !hashcmp(one->sha1, two->sha1))
2723 return 1; /* no change */
2724 if (!one->sha1_valid && !two->sha1_valid)
2725 return 1; /* both look at the same file on the filesystem. */
2726 return 0;
2727 }
2728
2729 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2730 {
2731 if (diff_unmodified_pair(p))
2732 return;
2733
2734 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2735 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2736 return; /* no tree diffs in patch format */
2737
2738 run_diff(p, o);
2739 }
2740
2741 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2742 struct diffstat_t *diffstat)
2743 {
2744 if (diff_unmodified_pair(p))
2745 return;
2746
2747 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2748 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2749 return; /* no tree diffs in patch format */
2750
2751 run_diffstat(p, o, diffstat);
2752 }
2753
2754 static void diff_flush_checkdiff(struct diff_filepair *p,
2755 struct diff_options *o)
2756 {
2757 if (diff_unmodified_pair(p))
2758 return;
2759
2760 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2761 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2762 return; /* no tree diffs in patch format */
2763
2764 run_checkdiff(p, o);
2765 }
2766
2767 int diff_queue_is_empty(void)
2768 {
2769 struct diff_queue_struct *q = &diff_queued_diff;
2770 int i;
2771 for (i = 0; i < q->nr; i++)
2772 if (!diff_unmodified_pair(q->queue[i]))
2773 return 0;
2774 return 1;
2775 }
2776
2777 #if DIFF_DEBUG
2778 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2779 {
2780 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2781 x, one ? one : "",
2782 s->path,
2783 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2784 s->mode,
2785 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2786 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2787 x, one ? one : "",
2788 s->size, s->xfrm_flags);
2789 }
2790
2791 void diff_debug_filepair(const struct diff_filepair *p, int i)
2792 {
2793 diff_debug_filespec(p->one, i, "one");
2794 diff_debug_filespec(p->two, i, "two");
2795 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2796 p->score, p->status ? p->status : '?',
2797 p->one->rename_used, p->broken_pair);
2798 }
2799
2800 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2801 {
2802 int i;
2803 if (msg)
2804 fprintf(stderr, "%s\n", msg);
2805 fprintf(stderr, "q->nr = %d\n", q->nr);
2806 for (i = 0; i < q->nr; i++) {
2807 struct diff_filepair *p = q->queue[i];
2808 diff_debug_filepair(p, i);
2809 }
2810 }
2811 #endif
2812
2813 static void diff_resolve_rename_copy(void)
2814 {
2815 int i;
2816 struct diff_filepair *p;
2817 struct diff_queue_struct *q = &diff_queued_diff;
2818
2819 diff_debug_queue("resolve-rename-copy", q);
2820
2821 for (i = 0; i < q->nr; i++) {
2822 p = q->queue[i];
2823 p->status = 0; /* undecided */
2824 if (DIFF_PAIR_UNMERGED(p))
2825 p->status = DIFF_STATUS_UNMERGED;
2826 else if (!DIFF_FILE_VALID(p->one))
2827 p->status = DIFF_STATUS_ADDED;
2828 else if (!DIFF_FILE_VALID(p->two))
2829 p->status = DIFF_STATUS_DELETED;
2830 else if (DIFF_PAIR_TYPE_CHANGED(p))
2831 p->status = DIFF_STATUS_TYPE_CHANGED;
2832
2833 /* from this point on, we are dealing with a pair
2834 * whose both sides are valid and of the same type, i.e.
2835 * either in-place edit or rename/copy edit.
2836 */
2837 else if (DIFF_PAIR_RENAME(p)) {
2838 /*
2839 * A rename might have re-connected a broken
2840 * pair up, causing the pathnames to be the
2841 * same again. If so, that's not a rename at
2842 * all, just a modification..
2843 *
2844 * Otherwise, see if this source was used for
2845 * multiple renames, in which case we decrement
2846 * the count, and call it a copy.
2847 */
2848 if (!strcmp(p->one->path, p->two->path))
2849 p->status = DIFF_STATUS_MODIFIED;
2850 else if (--p->one->rename_used > 0)
2851 p->status = DIFF_STATUS_COPIED;
2852 else
2853 p->status = DIFF_STATUS_RENAMED;
2854 }
2855 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2856 p->one->mode != p->two->mode ||
2857 is_null_sha1(p->one->sha1))
2858 p->status = DIFF_STATUS_MODIFIED;
2859 else {
2860 /* This is a "no-change" entry and should not
2861 * happen anymore, but prepare for broken callers.
2862 */
2863 error("feeding unmodified %s to diffcore",
2864 p->one->path);
2865 p->status = DIFF_STATUS_UNKNOWN;
2866 }
2867 }
2868 diff_debug_queue("resolve-rename-copy done", q);
2869 }
2870
2871 static int check_pair_status(struct diff_filepair *p)
2872 {
2873 switch (p->status) {
2874 case DIFF_STATUS_UNKNOWN:
2875 return 0;
2876 case 0:
2877 die("internal error in diff-resolve-rename-copy");
2878 default:
2879 return 1;
2880 }
2881 }
2882
2883 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2884 {
2885 int fmt = opt->output_format;
2886
2887 if (fmt & DIFF_FORMAT_CHECKDIFF)
2888 diff_flush_checkdiff(p, opt);
2889 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2890 diff_flush_raw(p, opt);
2891 else if (fmt & DIFF_FORMAT_NAME) {
2892 const char *name_a, *name_b;
2893 name_a = p->two->path;
2894 name_b = NULL;
2895 strip_prefix(opt->prefix_length, &name_a, &name_b);
2896 write_name_quoted(name_a, opt->file, opt->line_termination);
2897 }
2898 }
2899
2900 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
2901 {
2902 if (fs->mode)
2903 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
2904 else
2905 fprintf(file, " %s ", newdelete);
2906 write_name_quoted(fs->path, file, '\n');
2907 }
2908
2909
2910 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
2911 {
2912 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2913 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
2914 show_name ? ' ' : '\n');
2915 if (show_name) {
2916 write_name_quoted(p->two->path, file, '\n');
2917 }
2918 }
2919 }
2920
2921 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
2922 {
2923 char *names = pprint_rename(p->one->path, p->two->path);
2924
2925 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2926 free(names);
2927 show_mode_change(file, p, 0);
2928 }
2929
2930 static void diff_summary(FILE *file, struct diff_filepair *p)
2931 {
2932 switch(p->status) {
2933 case DIFF_STATUS_DELETED:
2934 show_file_mode_name(file, "delete", p->one);
2935 break;
2936 case DIFF_STATUS_ADDED:
2937 show_file_mode_name(file, "create", p->two);
2938 break;
2939 case DIFF_STATUS_COPIED:
2940 show_rename_copy(file, "copy", p);
2941 break;
2942 case DIFF_STATUS_RENAMED:
2943 show_rename_copy(file, "rename", p);
2944 break;
2945 default:
2946 if (p->score) {
2947 fputs(" rewrite ", file);
2948 write_name_quoted(p->two->path, file, ' ');
2949 fprintf(file, "(%d%%)\n", similarity_index(p));
2950 }
2951 show_mode_change(file, p, !p->score);
2952 break;
2953 }
2954 }
2955
2956 struct patch_id_t {
2957 struct xdiff_emit_state xm;
2958 SHA_CTX *ctx;
2959 int patchlen;
2960 };
2961
2962 static int remove_space(char *line, int len)
2963 {
2964 int i;
2965 char *dst = line;
2966 unsigned char c;
2967
2968 for (i = 0; i < len; i++)
2969 if (!isspace((c = line[i])))
2970 *dst++ = c;
2971
2972 return dst - line;
2973 }
2974
2975 static void patch_id_consume(void *priv, char *line, unsigned long len)
2976 {
2977 struct patch_id_t *data = priv;
2978 int new_len;
2979
2980 /* Ignore line numbers when computing the SHA1 of the patch */
2981 if (!prefixcmp(line, "@@ -"))
2982 return;
2983
2984 new_len = remove_space(line, len);
2985
2986 SHA1_Update(data->ctx, line, new_len);
2987 data->patchlen += new_len;
2988 }
2989
2990 /* returns 0 upon success, and writes result into sha1 */
2991 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2992 {
2993 struct diff_queue_struct *q = &diff_queued_diff;
2994 int i;
2995 SHA_CTX ctx;
2996 struct patch_id_t data;
2997 char buffer[PATH_MAX * 4 + 20];
2998
2999 SHA1_Init(&ctx);
3000 memset(&data, 0, sizeof(struct patch_id_t));
3001 data.ctx = &ctx;
3002 data.xm.consume = patch_id_consume;
3003
3004 for (i = 0; i < q->nr; i++) {
3005 xpparam_t xpp;
3006 xdemitconf_t xecfg;
3007 xdemitcb_t ecb;
3008 mmfile_t mf1, mf2;
3009 struct diff_filepair *p = q->queue[i];
3010 int len1, len2;
3011
3012 memset(&xecfg, 0, sizeof(xecfg));
3013 if (p->status == 0)
3014 return error("internal diff status error");
3015 if (p->status == DIFF_STATUS_UNKNOWN)
3016 continue;
3017 if (diff_unmodified_pair(p))
3018 continue;
3019 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3020 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3021 continue;
3022 if (DIFF_PAIR_UNMERGED(p))
3023 continue;
3024
3025 diff_fill_sha1_info(p->one);
3026 diff_fill_sha1_info(p->two);
3027 if (fill_mmfile(&mf1, p->one) < 0 ||
3028 fill_mmfile(&mf2, p->two) < 0)
3029 return error("unable to read files to diff");
3030
3031 len1 = remove_space(p->one->path, strlen(p->one->path));
3032 len2 = remove_space(p->two->path, strlen(p->two->path));
3033 if (p->one->mode == 0)
3034 len1 = snprintf(buffer, sizeof(buffer),
3035 "diff--gita/%.*sb/%.*s"
3036 "newfilemode%06o"
3037 "---/dev/null"
3038 "+++b/%.*s",
3039 len1, p->one->path,
3040 len2, p->two->path,
3041 p->two->mode,
3042 len2, p->two->path);
3043 else if (p->two->mode == 0)
3044 len1 = snprintf(buffer, sizeof(buffer),
3045 "diff--gita/%.*sb/%.*s"
3046 "deletedfilemode%06o"
3047 "---a/%.*s"
3048 "+++/dev/null",
3049 len1, p->one->path,
3050 len2, p->two->path,
3051 p->one->mode,
3052 len1, p->one->path);
3053 else
3054 len1 = snprintf(buffer, sizeof(buffer),
3055 "diff--gita/%.*sb/%.*s"
3056 "---a/%.*s"
3057 "+++b/%.*s",
3058 len1, p->one->path,
3059 len2, p->two->path,
3060 len1, p->one->path,
3061 len2, p->two->path);
3062 SHA1_Update(&ctx, buffer, len1);
3063
3064 xpp.flags = XDF_NEED_MINIMAL;
3065 xecfg.ctxlen = 3;
3066 xecfg.flags = XDL_EMIT_FUNCNAMES;
3067 ecb.outf = xdiff_outf;
3068 ecb.priv = &data;
3069 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
3070 }
3071
3072 SHA1_Final(sha1, &ctx);
3073 return 0;
3074 }
3075
3076 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3077 {
3078 struct diff_queue_struct *q = &diff_queued_diff;
3079 int i;
3080 int result = diff_get_patch_id(options, sha1);
3081
3082 for (i = 0; i < q->nr; i++)
3083 diff_free_filepair(q->queue[i]);
3084
3085 free(q->queue);
3086 q->queue = NULL;
3087 q->nr = q->alloc = 0;
3088
3089 return result;
3090 }
3091
3092 static int is_summary_empty(const struct diff_queue_struct *q)
3093 {
3094 int i;
3095
3096 for (i = 0; i < q->nr; i++) {
3097 const struct diff_filepair *p = q->queue[i];
3098
3099 switch (p->status) {
3100 case DIFF_STATUS_DELETED:
3101 case DIFF_STATUS_ADDED:
3102 case DIFF_STATUS_COPIED:
3103 case DIFF_STATUS_RENAMED:
3104 return 0;
3105 default:
3106 if (p->score)
3107 return 0;
3108 if (p->one->mode && p->two->mode &&
3109 p->one->mode != p->two->mode)
3110 return 0;
3111 break;
3112 }
3113 }
3114 return 1;
3115 }
3116
3117 void diff_flush(struct diff_options *options)
3118 {
3119 struct diff_queue_struct *q = &diff_queued_diff;
3120 int i, output_format = options->output_format;
3121 int separator = 0;
3122
3123 /*
3124 * Order: raw, stat, summary, patch
3125 * or: name/name-status/checkdiff (other bits clear)
3126 */
3127 if (!q->nr)
3128 goto free_queue;
3129
3130 if (output_format & (DIFF_FORMAT_RAW |
3131 DIFF_FORMAT_NAME |
3132 DIFF_FORMAT_NAME_STATUS |
3133 DIFF_FORMAT_CHECKDIFF)) {
3134 for (i = 0; i < q->nr; i++) {
3135 struct diff_filepair *p = q->queue[i];
3136 if (check_pair_status(p))
3137 flush_one_pair(p, options);
3138 }
3139 separator++;
3140 }
3141
3142 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3143 struct diffstat_t diffstat;
3144
3145 memset(&diffstat, 0, sizeof(struct diffstat_t));
3146 diffstat.xm.consume = diffstat_consume;
3147 for (i = 0; i < q->nr; i++) {
3148 struct diff_filepair *p = q->queue[i];
3149 if (check_pair_status(p))
3150 diff_flush_stat(p, options, &diffstat);
3151 }
3152 if (output_format & DIFF_FORMAT_NUMSTAT)
3153 show_numstat(&diffstat, options);
3154 if (output_format & DIFF_FORMAT_DIFFSTAT)
3155 show_stats(&diffstat, options);
3156 if (output_format & DIFF_FORMAT_SHORTSTAT)
3157 show_shortstats(&diffstat, options);
3158 free_diffstat_info(&diffstat);
3159 separator++;
3160 }
3161 if (output_format & DIFF_FORMAT_DIRSTAT)
3162 show_dirstat(options);
3163
3164 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3165 for (i = 0; i < q->nr; i++)
3166 diff_summary(options->file, q->queue[i]);
3167 separator++;
3168 }
3169
3170 if (output_format & DIFF_FORMAT_PATCH) {
3171 if (separator) {
3172 if (options->stat_sep) {
3173 /* attach patch instead of inline */
3174 fputs(options->stat_sep, options->file);
3175 } else {
3176 putc(options->line_termination, options->file);
3177 }
3178 }
3179
3180 for (i = 0; i < q->nr; i++) {
3181 struct diff_filepair *p = q->queue[i];
3182 if (check_pair_status(p))
3183 diff_flush_patch(p, options);
3184 }
3185 }
3186
3187 if (output_format & DIFF_FORMAT_CALLBACK)
3188 options->format_callback(q, options, options->format_callback_data);
3189
3190 for (i = 0; i < q->nr; i++)
3191 diff_free_filepair(q->queue[i]);
3192 free_queue:
3193 free(q->queue);
3194 q->queue = NULL;
3195 q->nr = q->alloc = 0;
3196 if (options->close_file)
3197 fclose(options->file);
3198 }
3199
3200 static void diffcore_apply_filter(const char *filter)
3201 {
3202 int i;
3203 struct diff_queue_struct *q = &diff_queued_diff;
3204 struct diff_queue_struct outq;
3205 outq.queue = NULL;
3206 outq.nr = outq.alloc = 0;
3207
3208 if (!filter)
3209 return;
3210
3211 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3212 int found;
3213 for (i = found = 0; !found && i < q->nr; i++) {
3214 struct diff_filepair *p = q->queue[i];
3215 if (((p->status == DIFF_STATUS_MODIFIED) &&
3216 ((p->score &&
3217 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3218 (!p->score &&
3219 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3220 ((p->status != DIFF_STATUS_MODIFIED) &&
3221 strchr(filter, p->status)))
3222 found++;
3223 }
3224 if (found)
3225 return;
3226
3227 /* otherwise we will clear the whole queue
3228 * by copying the empty outq at the end of this
3229 * function, but first clear the current entries
3230 * in the queue.
3231 */
3232 for (i = 0; i < q->nr; i++)
3233 diff_free_filepair(q->queue[i]);
3234 }
3235 else {
3236 /* Only the matching ones */
3237 for (i = 0; i < q->nr; i++) {
3238 struct diff_filepair *p = q->queue[i];
3239
3240 if (((p->status == DIFF_STATUS_MODIFIED) &&
3241 ((p->score &&
3242 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3243 (!p->score &&
3244 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3245 ((p->status != DIFF_STATUS_MODIFIED) &&
3246 strchr(filter, p->status)))
3247 diff_q(&outq, p);
3248 else
3249 diff_free_filepair(p);
3250 }
3251 }
3252 free(q->queue);
3253 *q = outq;
3254 }
3255
3256 /* Check whether two filespecs with the same mode and size are identical */
3257 static int diff_filespec_is_identical(struct diff_filespec *one,
3258 struct diff_filespec *two)
3259 {
3260 if (S_ISGITLINK(one->mode))
3261 return 0;
3262 if (diff_populate_filespec(one, 0))
3263 return 0;
3264 if (diff_populate_filespec(two, 0))
3265 return 0;
3266 return !memcmp(one->data, two->data, one->size);
3267 }
3268
3269 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3270 {
3271 int i;
3272 struct diff_queue_struct *q = &diff_queued_diff;
3273 struct diff_queue_struct outq;
3274 outq.queue = NULL;
3275 outq.nr = outq.alloc = 0;
3276
3277 for (i = 0; i < q->nr; i++) {
3278 struct diff_filepair *p = q->queue[i];
3279
3280 /*
3281 * 1. Entries that come from stat info dirtyness
3282 * always have both sides (iow, not create/delete),
3283 * one side of the object name is unknown, with
3284 * the same mode and size. Keep the ones that
3285 * do not match these criteria. They have real
3286 * differences.
3287 *
3288 * 2. At this point, the file is known to be modified,
3289 * with the same mode and size, and the object
3290 * name of one side is unknown. Need to inspect
3291 * the identical contents.
3292 */
3293 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3294 !DIFF_FILE_VALID(p->two) ||
3295 (p->one->sha1_valid && p->two->sha1_valid) ||
3296 (p->one->mode != p->two->mode) ||
3297 diff_populate_filespec(p->one, 1) ||
3298 diff_populate_filespec(p->two, 1) ||
3299 (p->one->size != p->two->size) ||
3300 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3301 diff_q(&outq, p);
3302 else {
3303 /*
3304 * The caller can subtract 1 from skip_stat_unmatch
3305 * to determine how many paths were dirty only
3306 * due to stat info mismatch.
3307 */
3308 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3309 diffopt->skip_stat_unmatch++;
3310 diff_free_filepair(p);
3311 }
3312 }
3313 free(q->queue);
3314 *q = outq;
3315 }
3316
3317 void diffcore_std(struct diff_options *options)
3318 {
3319 if (DIFF_OPT_TST(options, QUIET))
3320 return;
3321
3322 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3323 diffcore_skip_stat_unmatch(options);
3324 if (options->break_opt != -1)
3325 diffcore_break(options->break_opt);
3326 if (options->detect_rename)
3327 diffcore_rename(options);
3328 if (options->break_opt != -1)
3329 diffcore_merge_broken();
3330 if (options->pickaxe)
3331 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3332 if (options->orderfile)
3333 diffcore_order(options->orderfile);
3334 diff_resolve_rename_copy();
3335 diffcore_apply_filter(options->filter);
3336
3337 if (diff_queued_diff.nr)
3338 DIFF_OPT_SET(options, HAS_CHANGES);
3339 else
3340 DIFF_OPT_CLR(options, HAS_CHANGES);
3341 }
3342
3343 int diff_result_code(struct diff_options *opt, int status)
3344 {
3345 int result = 0;
3346 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3347 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3348 return status;
3349 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3350 DIFF_OPT_TST(opt, HAS_CHANGES))
3351 result |= 01;
3352 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3353 DIFF_OPT_TST(opt, CHECK_FAILED))
3354 result |= 02;
3355 return result;
3356 }
3357
3358 void diff_addremove(struct diff_options *options,
3359 int addremove, unsigned mode,
3360 const unsigned char *sha1,
3361 const char *base, const char *path)
3362 {
3363 char concatpath[PATH_MAX];
3364 struct diff_filespec *one, *two;
3365
3366 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3367 return;
3368
3369 /* This may look odd, but it is a preparation for
3370 * feeding "there are unchanged files which should
3371 * not produce diffs, but when you are doing copy
3372 * detection you would need them, so here they are"
3373 * entries to the diff-core. They will be prefixed
3374 * with something like '=' or '*' (I haven't decided
3375 * which but should not make any difference).
3376 * Feeding the same new and old to diff_change()
3377 * also has the same effect.
3378 * Before the final output happens, they are pruned after
3379 * merged into rename/copy pairs as appropriate.
3380 */
3381 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3382 addremove = (addremove == '+' ? '-' :
3383 addremove == '-' ? '+' : addremove);
3384
3385 if (!path) path = "";
3386 sprintf(concatpath, "%s%s", base, path);
3387
3388 if (options->prefix &&
3389 strncmp(concatpath, options->prefix, options->prefix_length))
3390 return;
3391
3392 one = alloc_filespec(concatpath);
3393 two = alloc_filespec(concatpath);
3394
3395 if (addremove != '+')
3396 fill_filespec(one, sha1, mode);
3397 if (addremove != '-')
3398 fill_filespec(two, sha1, mode);
3399
3400 diff_queue(&diff_queued_diff, one, two);
3401 DIFF_OPT_SET(options, HAS_CHANGES);
3402 }
3403
3404 void diff_change(struct diff_options *options,
3405 unsigned old_mode, unsigned new_mode,
3406 const unsigned char *old_sha1,
3407 const unsigned char *new_sha1,
3408 const char *base, const char *path)
3409 {
3410 char concatpath[PATH_MAX];
3411 struct diff_filespec *one, *two;
3412
3413 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3414 && S_ISGITLINK(new_mode))
3415 return;
3416
3417 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3418 unsigned tmp;
3419 const unsigned char *tmp_c;
3420 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3421 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3422 }
3423 if (!path) path = "";
3424 sprintf(concatpath, "%s%s", base, path);
3425
3426 if (options->prefix &&
3427 strncmp(concatpath, options->prefix, options->prefix_length))
3428 return;
3429
3430 one = alloc_filespec(concatpath);
3431 two = alloc_filespec(concatpath);
3432 fill_filespec(one, old_sha1, old_mode);
3433 fill_filespec(two, new_sha1, new_mode);
3434
3435 diff_queue(&diff_queued_diff, one, two);
3436 DIFF_OPT_SET(options, HAS_CHANGES);
3437 }
3438
3439 void diff_unmerge(struct diff_options *options,
3440 const char *path,
3441 unsigned mode, const unsigned char *sha1)
3442 {
3443 struct diff_filespec *one, *two;
3444
3445 if (options->prefix &&
3446 strncmp(path, options->prefix, options->prefix_length))
3447 return;
3448
3449 one = alloc_filespec(path);
3450 two = alloc_filespec(path);
3451 fill_filespec(one, sha1, mode);
3452 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3453 }
Miklos' Git tree to make git-merge a builtin.