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