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git-rebase: document suppression of duplicate commits
[git/debian.git] / diff.c
blob6648e015213913e693b4450230a5a0896a21f7a0
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
13 #ifdef NO_FAST_WORKING_DIRECTORY
14 #define FAST_WORKING_DIRECTORY 0
15 #else
16 #define FAST_WORKING_DIRECTORY 1
17 #endif
18
19 static int diff_detect_rename_default;
20 static int diff_rename_limit_default = 100;
21 static int diff_use_color_default;
22 int diff_auto_refresh_index = 1;
23
24 static char diff_colors[][COLOR_MAXLEN] = {
25 "\033[m", /* reset */
26 "", /* PLAIN (normal) */
27 "\033[1m", /* METAINFO (bold) */
28 "\033[36m", /* FRAGINFO (cyan) */
29 "\033[31m", /* OLD (red) */
30 "\033[32m", /* NEW (green) */
31 "\033[33m", /* COMMIT (yellow) */
32 "\033[41m", /* WHITESPACE (red background) */
33 };
34
35 static int parse_diff_color_slot(const char *var, int ofs)
36 {
37 if (!strcasecmp(var+ofs, "plain"))
38 return DIFF_PLAIN;
39 if (!strcasecmp(var+ofs, "meta"))
40 return DIFF_METAINFO;
41 if (!strcasecmp(var+ofs, "frag"))
42 return DIFF_FRAGINFO;
43 if (!strcasecmp(var+ofs, "old"))
44 return DIFF_FILE_OLD;
45 if (!strcasecmp(var+ofs, "new"))
46 return DIFF_FILE_NEW;
47 if (!strcasecmp(var+ofs, "commit"))
48 return DIFF_COMMIT;
49 if (!strcasecmp(var+ofs, "whitespace"))
50 return DIFF_WHITESPACE;
51 die("bad config variable '%s'", var);
52 }
53
54 static struct ll_diff_driver {
55 const char *name;
56 struct ll_diff_driver *next;
57 char *cmd;
58 } *user_diff, **user_diff_tail;
59
60 static void read_config_if_needed(void)
61 {
62 if (!user_diff_tail) {
63 user_diff_tail = &user_diff;
64 git_config(git_diff_ui_config);
65 }
66 }
67
68 /*
69 * Currently there is only "diff.<drivername>.command" variable;
70 * because there are "diff.color.<slot>" variables, we are parsing
71 * this in a bit convoluted way to allow low level diff driver
72 * called "color".
73 */
74 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
75 {
76 const char *name;
77 int namelen;
78 struct ll_diff_driver *drv;
79
80 name = var + 5;
81 namelen = ep - name;
82 for (drv = user_diff; drv; drv = drv->next)
83 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
84 break;
85 if (!drv) {
86 drv = xcalloc(1, sizeof(struct ll_diff_driver));
87 drv->name = xmemdupz(name, namelen);
88 if (!user_diff_tail)
89 user_diff_tail = &user_diff;
90 *user_diff_tail = drv;
91 user_diff_tail = &(drv->next);
92 }
93
94 if (!value)
95 return error("%s: lacks value", var);
96 drv->cmd = strdup(value);
97 return 0;
98 }
99
100 /*
101 * 'diff.<what>.funcname' attribute can be specified in the configuration
102 * to define a customized regexp to find the beginning of a function to
103 * be used for hunk header lines of "diff -p" style output.
104 */
105 static struct funcname_pattern {
106 char *name;
107 char *pattern;
108 struct funcname_pattern *next;
109 } *funcname_pattern_list;
110
111 static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
112 {
113 const char *name;
114 int namelen;
115 struct funcname_pattern *pp;
116
117 name = var + 5; /* "diff." */
118 namelen = ep - name;
119
120 for (pp = funcname_pattern_list; pp; pp = pp->next)
121 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
122 break;
123 if (!pp) {
124 pp = xcalloc(1, sizeof(*pp));
125 pp->name = xmemdupz(name, namelen);
126 pp->next = funcname_pattern_list;
127 funcname_pattern_list = pp;
128 }
129 if (pp->pattern)
130 free(pp->pattern);
131 pp->pattern = xstrdup(value);
132 return 0;
133 }
134
135 /*
136 * These are to give UI layer defaults.
137 * The core-level commands such as git-diff-files should
138 * never be affected by the setting of diff.renames
139 * the user happens to have in the configuration file.
140 */
141 int git_diff_ui_config(const char *var, const char *value)
142 {
143 if (!strcmp(var, "diff.renamelimit")) {
144 diff_rename_limit_default = git_config_int(var, value);
145 return 0;
146 }
147 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
148 diff_use_color_default = git_config_colorbool(var, value);
149 return 0;
150 }
151 if (!strcmp(var, "diff.renames")) {
152 if (!value)
153 diff_detect_rename_default = DIFF_DETECT_RENAME;
154 else if (!strcasecmp(value, "copies") ||
155 !strcasecmp(value, "copy"))
156 diff_detect_rename_default = DIFF_DETECT_COPY;
157 else if (git_config_bool(var,value))
158 diff_detect_rename_default = DIFF_DETECT_RENAME;
159 return 0;
160 }
161 if (!strcmp(var, "diff.autorefreshindex")) {
162 diff_auto_refresh_index = git_config_bool(var, value);
163 return 0;
164 }
165 if (!prefixcmp(var, "diff.")) {
166 const char *ep = strrchr(var, '.');
167
168 if (ep != var + 4) {
169 if (!strcmp(ep, ".command"))
170 return parse_lldiff_command(var, ep, value);
171 if (!strcmp(ep, ".funcname"))
172 return parse_funcname_pattern(var, ep, value);
173 }
174 }
175 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
176 int slot = parse_diff_color_slot(var, 11);
177 color_parse(value, var, diff_colors[slot]);
178 return 0;
179 }
180
181 return git_default_config(var, value);
182 }
183
184 static char *quote_two(const char *one, const char *two)
185 {
186 int need_one = quote_c_style(one, NULL, NULL, 1);
187 int need_two = quote_c_style(two, NULL, NULL, 1);
188 struct strbuf res;
189
190 strbuf_init(&res, 0);
191 if (need_one + need_two) {
192 strbuf_addch(&res, '"');
193 quote_c_style(one, &res, NULL, 1);
194 quote_c_style(two, &res, NULL, 1);
195 strbuf_addch(&res, '"');
196 } else {
197 strbuf_addstr(&res, one);
198 strbuf_addstr(&res, two);
199 }
200 return strbuf_detach(&res, NULL);
201 }
202
203 static const char *external_diff(void)
204 {
205 static const char *external_diff_cmd = NULL;
206 static int done_preparing = 0;
207
208 if (done_preparing)
209 return external_diff_cmd;
210 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
211 done_preparing = 1;
212 return external_diff_cmd;
213 }
214
215 static struct diff_tempfile {
216 const char *name; /* filename external diff should read from */
217 char hex[41];
218 char mode[10];
219 char tmp_path[PATH_MAX];
220 } diff_temp[2];
221
222 static int count_lines(const char *data, int size)
223 {
224 int count, ch, completely_empty = 1, nl_just_seen = 0;
225 count = 0;
226 while (0 < size--) {
227 ch = *data++;
228 if (ch == '\n') {
229 count++;
230 nl_just_seen = 1;
231 completely_empty = 0;
232 }
233 else {
234 nl_just_seen = 0;
235 completely_empty = 0;
236 }
237 }
238 if (completely_empty)
239 return 0;
240 if (!nl_just_seen)
241 count++; /* no trailing newline */
242 return count;
243 }
244
245 static void print_line_count(int count)
246 {
247 switch (count) {
248 case 0:
249 printf("0,0");
250 break;
251 case 1:
252 printf("1");
253 break;
254 default:
255 printf("1,%d", count);
256 break;
257 }
258 }
259
260 static void copy_file(int prefix, const char *data, int size,
261 const char *set, const char *reset)
262 {
263 int ch, nl_just_seen = 1;
264 while (0 < size--) {
265 ch = *data++;
266 if (nl_just_seen) {
267 fputs(set, stdout);
268 putchar(prefix);
269 }
270 if (ch == '\n') {
271 nl_just_seen = 1;
272 fputs(reset, stdout);
273 } else
274 nl_just_seen = 0;
275 putchar(ch);
276 }
277 if (!nl_just_seen)
278 printf("%s\n\\ No newline at end of file\n", reset);
279 }
280
281 static void emit_rewrite_diff(const char *name_a,
282 const char *name_b,
283 struct diff_filespec *one,
284 struct diff_filespec *two,
285 int color_diff)
286 {
287 int lc_a, lc_b;
288 const char *name_a_tab, *name_b_tab;
289 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
290 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
291 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
292 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
293 const char *reset = diff_get_color(color_diff, DIFF_RESET);
294
295 name_a += (*name_a == '/');
296 name_b += (*name_b == '/');
297 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
298 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
299
300 diff_populate_filespec(one, 0);
301 diff_populate_filespec(two, 0);
302 lc_a = count_lines(one->data, one->size);
303 lc_b = count_lines(two->data, two->size);
304 printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
305 metainfo, name_a, name_a_tab, reset,
306 metainfo, name_b, name_b_tab, reset, fraginfo);
307 print_line_count(lc_a);
308 printf(" +");
309 print_line_count(lc_b);
310 printf(" @@%s\n", reset);
311 if (lc_a)
312 copy_file('-', one->data, one->size, old, reset);
313 if (lc_b)
314 copy_file('+', two->data, two->size, new, reset);
315 }
316
317 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
318 {
319 if (!DIFF_FILE_VALID(one)) {
320 mf->ptr = (char *)""; /* does not matter */
321 mf->size = 0;
322 return 0;
323 }
324 else if (diff_populate_filespec(one, 0))
325 return -1;
326 mf->ptr = one->data;
327 mf->size = one->size;
328 return 0;
329 }
330
331 struct diff_words_buffer {
332 mmfile_t text;
333 long alloc;
334 long current; /* output pointer */
335 int suppressed_newline;
336 };
337
338 static void diff_words_append(char *line, unsigned long len,
339 struct diff_words_buffer *buffer)
340 {
341 if (buffer->text.size + len > buffer->alloc) {
342 buffer->alloc = (buffer->text.size + len) * 3 / 2;
343 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
344 }
345 line++;
346 len--;
347 memcpy(buffer->text.ptr + buffer->text.size, line, len);
348 buffer->text.size += len;
349 }
350
351 struct diff_words_data {
352 struct xdiff_emit_state xm;
353 struct diff_words_buffer minus, plus;
354 };
355
356 static void print_word(struct diff_words_buffer *buffer, int len, int color,
357 int suppress_newline)
358 {
359 const char *ptr;
360 int eol = 0;
361
362 if (len == 0)
363 return;
364
365 ptr = buffer->text.ptr + buffer->current;
366 buffer->current += len;
367
368 if (ptr[len - 1] == '\n') {
369 eol = 1;
370 len--;
371 }
372
373 fputs(diff_get_color(1, color), stdout);
374 fwrite(ptr, len, 1, stdout);
375 fputs(diff_get_color(1, DIFF_RESET), stdout);
376
377 if (eol) {
378 if (suppress_newline)
379 buffer->suppressed_newline = 1;
380 else
381 putchar('\n');
382 }
383 }
384
385 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
386 {
387 struct diff_words_data *diff_words = priv;
388
389 if (diff_words->minus.suppressed_newline) {
390 if (line[0] != '+')
391 putchar('\n');
392 diff_words->minus.suppressed_newline = 0;
393 }
394
395 len--;
396 switch (line[0]) {
397 case '-':
398 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
399 break;
400 case '+':
401 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
402 break;
403 case ' ':
404 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
405 diff_words->minus.current += len;
406 break;
407 }
408 }
409
410 /* this executes the word diff on the accumulated buffers */
411 static void diff_words_show(struct diff_words_data *diff_words)
412 {
413 xpparam_t xpp;
414 xdemitconf_t xecfg;
415 xdemitcb_t ecb;
416 mmfile_t minus, plus;
417 int i;
418
419 memset(&xecfg, 0, sizeof(xecfg));
420 minus.size = diff_words->minus.text.size;
421 minus.ptr = xmalloc(minus.size);
422 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
423 for (i = 0; i < minus.size; i++)
424 if (isspace(minus.ptr[i]))
425 minus.ptr[i] = '\n';
426 diff_words->minus.current = 0;
427
428 plus.size = diff_words->plus.text.size;
429 plus.ptr = xmalloc(plus.size);
430 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
431 for (i = 0; i < plus.size; i++)
432 if (isspace(plus.ptr[i]))
433 plus.ptr[i] = '\n';
434 diff_words->plus.current = 0;
435
436 xpp.flags = XDF_NEED_MINIMAL;
437 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
438 ecb.outf = xdiff_outf;
439 ecb.priv = diff_words;
440 diff_words->xm.consume = fn_out_diff_words_aux;
441 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
442
443 free(minus.ptr);
444 free(plus.ptr);
445 diff_words->minus.text.size = diff_words->plus.text.size = 0;
446
447 if (diff_words->minus.suppressed_newline) {
448 putchar('\n');
449 diff_words->minus.suppressed_newline = 0;
450 }
451 }
452
453 struct emit_callback {
454 struct xdiff_emit_state xm;
455 int nparents, color_diff;
456 const char **label_path;
457 struct diff_words_data *diff_words;
458 int *found_changesp;
459 };
460
461 static void free_diff_words_data(struct emit_callback *ecbdata)
462 {
463 if (ecbdata->diff_words) {
464 /* flush buffers */
465 if (ecbdata->diff_words->minus.text.size ||
466 ecbdata->diff_words->plus.text.size)
467 diff_words_show(ecbdata->diff_words);
468
469 if (ecbdata->diff_words->minus.text.ptr)
470 free (ecbdata->diff_words->minus.text.ptr);
471 if (ecbdata->diff_words->plus.text.ptr)
472 free (ecbdata->diff_words->plus.text.ptr);
473 free(ecbdata->diff_words);
474 ecbdata->diff_words = NULL;
475 }
476 }
477
478 const char *diff_get_color(int diff_use_color, enum color_diff ix)
479 {
480 if (diff_use_color)
481 return diff_colors[ix];
482 return "";
483 }
484
485 static void emit_line(const char *set, const char *reset, const char *line, int len)
486 {
487 if (len > 0 && line[len-1] == '\n')
488 len--;
489 fputs(set, stdout);
490 fwrite(line, len, 1, stdout);
491 puts(reset);
492 }
493
494 static void emit_line_with_ws(int nparents,
495 const char *set, const char *reset, const char *ws,
496 const char *line, int len)
497 {
498 int col0 = nparents;
499 int last_tab_in_indent = -1;
500 int last_space_in_indent = -1;
501 int i;
502 int tail = len;
503 int need_highlight_leading_space = 0;
504 /* The line is a newly added line. Does it have funny leading
505 * whitespaces? In indent, SP should never precede a TAB.
506 */
507 for (i = col0; i < len; i++) {
508 if (line[i] == '\t') {
509 last_tab_in_indent = i;
510 if (0 <= last_space_in_indent)
511 need_highlight_leading_space = 1;
512 }
513 else if (line[i] == ' ')
514 last_space_in_indent = i;
515 else
516 break;
517 }
518 fputs(set, stdout);
519 fwrite(line, col0, 1, stdout);
520 fputs(reset, stdout);
521 if (((i == len) || line[i] == '\n') && i != col0) {
522 /* The whole line was indent */
523 emit_line(ws, reset, line + col0, len - col0);
524 return;
525 }
526 i = col0;
527 if (need_highlight_leading_space) {
528 while (i < last_tab_in_indent) {
529 if (line[i] == ' ') {
530 fputs(ws, stdout);
531 putchar(' ');
532 fputs(reset, stdout);
533 }
534 else
535 putchar(line[i]);
536 i++;
537 }
538 }
539 tail = len - 1;
540 if (line[tail] == '\n' && i < tail)
541 tail--;
542 while (i < tail) {
543 if (!isspace(line[tail]))
544 break;
545 tail--;
546 }
547 if ((i < tail && line[tail + 1] != '\n')) {
548 /* This has whitespace between tail+1..len */
549 fputs(set, stdout);
550 fwrite(line + i, tail - i + 1, 1, stdout);
551 fputs(reset, stdout);
552 emit_line(ws, reset, line + tail + 1, len - tail - 1);
553 }
554 else
555 emit_line(set, reset, line + i, len - i);
556 }
557
558 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
559 {
560 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
561 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
562
563 if (!*ws)
564 emit_line(set, reset, line, len);
565 else
566 emit_line_with_ws(ecbdata->nparents, set, reset, ws,
567 line, len);
568 }
569
570 static void fn_out_consume(void *priv, char *line, unsigned long len)
571 {
572 int i;
573 int color;
574 struct emit_callback *ecbdata = priv;
575 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
576 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
577
578 *(ecbdata->found_changesp) = 1;
579
580 if (ecbdata->label_path[0]) {
581 const char *name_a_tab, *name_b_tab;
582
583 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
584 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
585
586 printf("%s--- %s%s%s\n",
587 set, ecbdata->label_path[0], reset, name_a_tab);
588 printf("%s+++ %s%s%s\n",
589 set, ecbdata->label_path[1], reset, name_b_tab);
590 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
591 }
592
593 /* This is not really necessary for now because
594 * this codepath only deals with two-way diffs.
595 */
596 for (i = 0; i < len && line[i] == '@'; i++)
597 ;
598 if (2 <= i && i < len && line[i] == ' ') {
599 ecbdata->nparents = i - 1;
600 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
601 reset, line, len);
602 return;
603 }
604
605 if (len < ecbdata->nparents) {
606 set = reset;
607 emit_line(reset, reset, line, len);
608 return;
609 }
610
611 color = DIFF_PLAIN;
612 if (ecbdata->diff_words && ecbdata->nparents != 1)
613 /* fall back to normal diff */
614 free_diff_words_data(ecbdata);
615 if (ecbdata->diff_words) {
616 if (line[0] == '-') {
617 diff_words_append(line, len,
618 &ecbdata->diff_words->minus);
619 return;
620 } else if (line[0] == '+') {
621 diff_words_append(line, len,
622 &ecbdata->diff_words->plus);
623 return;
624 }
625 if (ecbdata->diff_words->minus.text.size ||
626 ecbdata->diff_words->plus.text.size)
627 diff_words_show(ecbdata->diff_words);
628 line++;
629 len--;
630 emit_line(set, reset, line, len);
631 return;
632 }
633 for (i = 0; i < ecbdata->nparents && len; i++) {
634 if (line[i] == '-')
635 color = DIFF_FILE_OLD;
636 else if (line[i] == '+')
637 color = DIFF_FILE_NEW;
638 }
639
640 if (color != DIFF_FILE_NEW) {
641 emit_line(diff_get_color(ecbdata->color_diff, color),
642 reset, line, len);
643 return;
644 }
645 emit_add_line(reset, ecbdata, line, len);
646 }
647
648 static char *pprint_rename(const char *a, const char *b)
649 {
650 const char *old = a;
651 const char *new = b;
652 struct strbuf name;
653 int pfx_length, sfx_length;
654 int len_a = strlen(a);
655 int len_b = strlen(b);
656 int a_midlen, b_midlen;
657 int qlen_a = quote_c_style(a, NULL, NULL, 0);
658 int qlen_b = quote_c_style(b, NULL, NULL, 0);
659
660 strbuf_init(&name, 0);
661 if (qlen_a || qlen_b) {
662 quote_c_style(a, &name, NULL, 0);
663 strbuf_addstr(&name, " => ");
664 quote_c_style(b, &name, NULL, 0);
665 return strbuf_detach(&name, NULL);
666 }
667
668 /* Find common prefix */
669 pfx_length = 0;
670 while (*old && *new && *old == *new) {
671 if (*old == '/')
672 pfx_length = old - a + 1;
673 old++;
674 new++;
675 }
676
677 /* Find common suffix */
678 old = a + len_a;
679 new = b + len_b;
680 sfx_length = 0;
681 while (a <= old && b <= new && *old == *new) {
682 if (*old == '/')
683 sfx_length = len_a - (old - a);
684 old--;
685 new--;
686 }
687
688 /*
689 * pfx{mid-a => mid-b}sfx
690 * {pfx-a => pfx-b}sfx
691 * pfx{sfx-a => sfx-b}
692 * name-a => name-b
693 */
694 a_midlen = len_a - pfx_length - sfx_length;
695 b_midlen = len_b - pfx_length - sfx_length;
696 if (a_midlen < 0)
697 a_midlen = 0;
698 if (b_midlen < 0)
699 b_midlen = 0;
700
701 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
702 if (pfx_length + sfx_length) {
703 strbuf_add(&name, a, pfx_length);
704 strbuf_addch(&name, '{');
705 }
706 strbuf_add(&name, a + pfx_length, a_midlen);
707 strbuf_addstr(&name, " => ");
708 strbuf_add(&name, b + pfx_length, b_midlen);
709 if (pfx_length + sfx_length) {
710 strbuf_addch(&name, '}');
711 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
712 }
713 return strbuf_detach(&name, NULL);
714 }
715
716 struct diffstat_t {
717 struct xdiff_emit_state xm;
718
719 int nr;
720 int alloc;
721 struct diffstat_file {
722 char *name;
723 unsigned is_unmerged:1;
724 unsigned is_binary:1;
725 unsigned is_renamed:1;
726 unsigned int added, deleted;
727 } **files;
728 };
729
730 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
731 const char *name_a,
732 const char *name_b)
733 {
734 struct diffstat_file *x;
735 x = xcalloc(sizeof (*x), 1);
736 if (diffstat->nr == diffstat->alloc) {
737 diffstat->alloc = alloc_nr(diffstat->alloc);
738 diffstat->files = xrealloc(diffstat->files,
739 diffstat->alloc * sizeof(x));
740 }
741 diffstat->files[diffstat->nr++] = x;
742 if (name_b) {
743 x->name = pprint_rename(name_a, name_b);
744 x->is_renamed = 1;
745 }
746 else
747 x->name = xstrdup(name_a);
748 return x;
749 }
750
751 static void diffstat_consume(void *priv, char *line, unsigned long len)
752 {
753 struct diffstat_t *diffstat = priv;
754 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
755
756 if (line[0] == '+')
757 x->added++;
758 else if (line[0] == '-')
759 x->deleted++;
760 }
761
762 const char mime_boundary_leader[] = "------------";
763
764 static int scale_linear(int it, int width, int max_change)
765 {
766 /*
767 * make sure that at least one '-' is printed if there were deletions,
768 * and likewise for '+'.
769 */
770 if (max_change < 2)
771 return it;
772 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
773 }
774
775 static void show_name(const char *prefix, const char *name, int len,
776 const char *reset, const char *set)
777 {
778 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
779 }
780
781 static void show_graph(char ch, int cnt, const char *set, const char *reset)
782 {
783 if (cnt <= 0)
784 return;
785 printf("%s", set);
786 while (cnt--)
787 putchar(ch);
788 printf("%s", reset);
789 }
790
791 static void show_stats(struct diffstat_t* data, struct diff_options *options)
792 {
793 int i, len, add, del, total, adds = 0, dels = 0;
794 int max_change = 0, max_len = 0;
795 int total_files = data->nr;
796 int width, name_width;
797 const char *reset, *set, *add_c, *del_c;
798
799 if (data->nr == 0)
800 return;
801
802 width = options->stat_width ? options->stat_width : 80;
803 name_width = options->stat_name_width ? options->stat_name_width : 50;
804
805 /* Sanity: give at least 5 columns to the graph,
806 * but leave at least 10 columns for the name.
807 */
808 if (width < name_width + 15) {
809 if (name_width <= 25)
810 width = name_width + 15;
811 else
812 name_width = width - 15;
813 }
814
815 /* Find the longest filename and max number of changes */
816 reset = diff_get_color(options->color_diff, DIFF_RESET);
817 set = diff_get_color(options->color_diff, DIFF_PLAIN);
818 add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
819 del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
820
821 for (i = 0; i < data->nr; i++) {
822 struct diffstat_file *file = data->files[i];
823 int change = file->added + file->deleted;
824
825 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
826 struct strbuf buf;
827 strbuf_init(&buf, 0);
828 if (quote_c_style(file->name, &buf, NULL, 0)) {
829 free(file->name);
830 file->name = strbuf_detach(&buf, NULL);
831 } else {
832 strbuf_release(&buf);
833 }
834 }
835
836 len = strlen(file->name);
837 if (max_len < len)
838 max_len = len;
839
840 if (file->is_binary || file->is_unmerged)
841 continue;
842 if (max_change < change)
843 max_change = change;
844 }
845
846 /* Compute the width of the graph part;
847 * 10 is for one blank at the beginning of the line plus
848 * " | count " between the name and the graph.
849 *
850 * From here on, name_width is the width of the name area,
851 * and width is the width of the graph area.
852 */
853 name_width = (name_width < max_len) ? name_width : max_len;
854 if (width < (name_width + 10) + max_change)
855 width = width - (name_width + 10);
856 else
857 width = max_change;
858
859 for (i = 0; i < data->nr; i++) {
860 const char *prefix = "";
861 char *name = data->files[i]->name;
862 int added = data->files[i]->added;
863 int deleted = data->files[i]->deleted;
864 int name_len;
865
866 /*
867 * "scale" the filename
868 */
869 len = name_width;
870 name_len = strlen(name);
871 if (name_width < name_len) {
872 char *slash;
873 prefix = "...";
874 len -= 3;
875 name += name_len - len;
876 slash = strchr(name, '/');
877 if (slash)
878 name = slash;
879 }
880
881 if (data->files[i]->is_binary) {
882 show_name(prefix, name, len, reset, set);
883 printf(" Bin ");
884 printf("%s%d%s", del_c, deleted, reset);
885 printf(" -> ");
886 printf("%s%d%s", add_c, added, reset);
887 printf(" bytes");
888 printf("\n");
889 goto free_diffstat_file;
890 }
891 else if (data->files[i]->is_unmerged) {
892 show_name(prefix, name, len, reset, set);
893 printf(" Unmerged\n");
894 goto free_diffstat_file;
895 }
896 else if (!data->files[i]->is_renamed &&
897 (added + deleted == 0)) {
898 total_files--;
899 goto free_diffstat_file;
900 }
901
902 /*
903 * scale the add/delete
904 */
905 add = added;
906 del = deleted;
907 total = add + del;
908 adds += add;
909 dels += del;
910
911 if (width <= max_change) {
912 add = scale_linear(add, width, max_change);
913 del = scale_linear(del, width, max_change);
914 total = add + del;
915 }
916 show_name(prefix, name, len, reset, set);
917 printf("%5d ", added + deleted);
918 show_graph('+', add, add_c, reset);
919 show_graph('-', del, del_c, reset);
920 putchar('\n');
921 free_diffstat_file:
922 free(data->files[i]->name);
923 free(data->files[i]);
924 }
925 free(data->files);
926 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
927 set, total_files, adds, dels, reset);
928 }
929
930 static void show_shortstats(struct diffstat_t* data)
931 {
932 int i, adds = 0, dels = 0, total_files = data->nr;
933
934 if (data->nr == 0)
935 return;
936
937 for (i = 0; i < data->nr; i++) {
938 if (!data->files[i]->is_binary &&
939 !data->files[i]->is_unmerged) {
940 int added = data->files[i]->added;
941 int deleted= data->files[i]->deleted;
942 if (!data->files[i]->is_renamed &&
943 (added + deleted == 0)) {
944 total_files--;
945 } else {
946 adds += added;
947 dels += deleted;
948 }
949 }
950 free(data->files[i]->name);
951 free(data->files[i]);
952 }
953 free(data->files);
954
955 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
956 total_files, adds, dels);
957 }
958
959 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
960 {
961 int i;
962
963 for (i = 0; i < data->nr; i++) {
964 struct diffstat_file *file = data->files[i];
965
966 if (file->is_binary)
967 printf("-\t-\t");
968 else
969 printf("%d\t%d\t", file->added, file->deleted);
970 if (!file->is_renamed) {
971 write_name_quoted(file->name, stdout, options->line_termination);
972 } else {
973 fputs(file->name, stdout);
974 putchar(options->line_termination);
975 }
976 }
977 }
978
979 struct checkdiff_t {
980 struct xdiff_emit_state xm;
981 const char *filename;
982 int lineno, color_diff;
983 };
984
985 static void checkdiff_consume(void *priv, char *line, unsigned long len)
986 {
987 struct checkdiff_t *data = priv;
988 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
989 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
990 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
991
992 if (line[0] == '+') {
993 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
994
995 /* check space before tab */
996 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
997 if (line[i] == ' ')
998 spaces++;
999 if (line[i - 1] == '\t' && spaces)
1000 space_before_tab = 1;
1001
1002 /* check white space at line end */
1003 if (line[len - 1] == '\n')
1004 len--;
1005 if (isspace(line[len - 1]))
1006 white_space_at_end = 1;
1007
1008 if (space_before_tab || white_space_at_end) {
1009 printf("%s:%d: %s", data->filename, data->lineno, ws);
1010 if (space_before_tab) {
1011 printf("space before tab");
1012 if (white_space_at_end)
1013 putchar(',');
1014 }
1015 if (white_space_at_end)
1016 printf("white space at end");
1017 printf(":%s ", reset);
1018 emit_line_with_ws(1, set, reset, ws, line, len);
1019 }
1020
1021 data->lineno++;
1022 } else if (line[0] == ' ')
1023 data->lineno++;
1024 else if (line[0] == '@') {
1025 char *plus = strchr(line, '+');
1026 if (plus)
1027 data->lineno = strtol(plus, NULL, 10);
1028 else
1029 die("invalid diff");
1030 }
1031 }
1032
1033 static unsigned char *deflate_it(char *data,
1034 unsigned long size,
1035 unsigned long *result_size)
1036 {
1037 int bound;
1038 unsigned char *deflated;
1039 z_stream stream;
1040
1041 memset(&stream, 0, sizeof(stream));
1042 deflateInit(&stream, zlib_compression_level);
1043 bound = deflateBound(&stream, size);
1044 deflated = xmalloc(bound);
1045 stream.next_out = deflated;
1046 stream.avail_out = bound;
1047
1048 stream.next_in = (unsigned char *)data;
1049 stream.avail_in = size;
1050 while (deflate(&stream, Z_FINISH) == Z_OK)
1051 ; /* nothing */
1052 deflateEnd(&stream);
1053 *result_size = stream.total_out;
1054 return deflated;
1055 }
1056
1057 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1058 {
1059 void *cp;
1060 void *delta;
1061 void *deflated;
1062 void *data;
1063 unsigned long orig_size;
1064 unsigned long delta_size;
1065 unsigned long deflate_size;
1066 unsigned long data_size;
1067
1068 /* We could do deflated delta, or we could do just deflated two,
1069 * whichever is smaller.
1070 */
1071 delta = NULL;
1072 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1073 if (one->size && two->size) {
1074 delta = diff_delta(one->ptr, one->size,
1075 two->ptr, two->size,
1076 &delta_size, deflate_size);
1077 if (delta) {
1078 void *to_free = delta;
1079 orig_size = delta_size;
1080 delta = deflate_it(delta, delta_size, &delta_size);
1081 free(to_free);
1082 }
1083 }
1084
1085 if (delta && delta_size < deflate_size) {
1086 printf("delta %lu\n", orig_size);
1087 free(deflated);
1088 data = delta;
1089 data_size = delta_size;
1090 }
1091 else {
1092 printf("literal %lu\n", two->size);
1093 free(delta);
1094 data = deflated;
1095 data_size = deflate_size;
1096 }
1097
1098 /* emit data encoded in base85 */
1099 cp = data;
1100 while (data_size) {
1101 int bytes = (52 < data_size) ? 52 : data_size;
1102 char line[70];
1103 data_size -= bytes;
1104 if (bytes <= 26)
1105 line[0] = bytes + 'A' - 1;
1106 else
1107 line[0] = bytes - 26 + 'a' - 1;
1108 encode_85(line + 1, cp, bytes);
1109 cp = (char *) cp + bytes;
1110 puts(line);
1111 }
1112 printf("\n");
1113 free(data);
1114 }
1115
1116 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1117 {
1118 printf("GIT binary patch\n");
1119 emit_binary_diff_body(one, two);
1120 emit_binary_diff_body(two, one);
1121 }
1122
1123 static void setup_diff_attr_check(struct git_attr_check *check)
1124 {
1125 static struct git_attr *attr_diff;
1126
1127 if (!attr_diff) {
1128 attr_diff = git_attr("diff", 4);
1129 }
1130 check[0].attr = attr_diff;
1131 }
1132
1133 static void diff_filespec_check_attr(struct diff_filespec *one)
1134 {
1135 struct git_attr_check attr_diff_check;
1136 int check_from_data = 0;
1137
1138 if (one->checked_attr)
1139 return;
1140
1141 setup_diff_attr_check(&attr_diff_check);
1142 one->is_binary = 0;
1143 one->funcname_pattern_ident = NULL;
1144
1145 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1146 const char *value;
1147
1148 /* binaryness */
1149 value = attr_diff_check.value;
1150 if (ATTR_TRUE(value))
1151 ;
1152 else if (ATTR_FALSE(value))
1153 one->is_binary = 1;
1154 else
1155 check_from_data = 1;
1156
1157 /* funcname pattern ident */
1158 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1159 ;
1160 else
1161 one->funcname_pattern_ident = value;
1162 }
1163
1164 if (check_from_data) {
1165 if (!one->data && DIFF_FILE_VALID(one))
1166 diff_populate_filespec(one, 0);
1167
1168 if (one->data)
1169 one->is_binary = buffer_is_binary(one->data, one->size);
1170 }
1171 }
1172
1173 int diff_filespec_is_binary(struct diff_filespec *one)
1174 {
1175 diff_filespec_check_attr(one);
1176 return one->is_binary;
1177 }
1178
1179 static const char *funcname_pattern(const char *ident)
1180 {
1181 struct funcname_pattern *pp;
1182
1183 read_config_if_needed();
1184 for (pp = funcname_pattern_list; pp; pp = pp->next)
1185 if (!strcmp(ident, pp->name))
1186 return pp->pattern;
1187 return NULL;
1188 }
1189
1190 static struct builtin_funcname_pattern {
1191 const char *name;
1192 const char *pattern;
1193 } builtin_funcname_pattern[] = {
1194 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1195 "new\\|return\\|switch\\|throw\\|while\\)\n"
1196 "^[ ]*\\(\\([ ]*"
1197 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1198 "[ ]*([^;]*$\\)" },
1199 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1200 };
1201
1202 static const char *diff_funcname_pattern(struct diff_filespec *one)
1203 {
1204 const char *ident, *pattern;
1205 int i;
1206
1207 diff_filespec_check_attr(one);
1208 ident = one->funcname_pattern_ident;
1209
1210 if (!ident)
1211 /*
1212 * If the config file has "funcname.default" defined, that
1213 * regexp is used; otherwise NULL is returned and xemit uses
1214 * the built-in default.
1215 */
1216 return funcname_pattern("default");
1217
1218 /* Look up custom "funcname.$ident" regexp from config. */
1219 pattern = funcname_pattern(ident);
1220 if (pattern)
1221 return pattern;
1222
1223 /*
1224 * And define built-in fallback patterns here. Note that
1225 * these can be overriden by the user's config settings.
1226 */
1227 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1228 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1229 return builtin_funcname_pattern[i].pattern;
1230
1231 return NULL;
1232 }
1233
1234 static void builtin_diff(const char *name_a,
1235 const char *name_b,
1236 struct diff_filespec *one,
1237 struct diff_filespec *two,
1238 const char *xfrm_msg,
1239 struct diff_options *o,
1240 int complete_rewrite)
1241 {
1242 mmfile_t mf1, mf2;
1243 const char *lbl[2];
1244 char *a_one, *b_two;
1245 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1246 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
1247
1248 a_one = quote_two("a/", name_a + (*name_a == '/'));
1249 b_two = quote_two("b/", name_b + (*name_b == '/'));
1250 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1251 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1252 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1253 if (lbl[0][0] == '/') {
1254 /* /dev/null */
1255 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1256 if (xfrm_msg && xfrm_msg[0])
1257 printf("%s%s%s\n", set, xfrm_msg, reset);
1258 }
1259 else if (lbl[1][0] == '/') {
1260 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1261 if (xfrm_msg && xfrm_msg[0])
1262 printf("%s%s%s\n", set, xfrm_msg, reset);
1263 }
1264 else {
1265 if (one->mode != two->mode) {
1266 printf("%sold mode %06o%s\n", set, one->mode, reset);
1267 printf("%snew mode %06o%s\n", set, two->mode, reset);
1268 }
1269 if (xfrm_msg && xfrm_msg[0])
1270 printf("%s%s%s\n", set, xfrm_msg, reset);
1271 /*
1272 * we do not run diff between different kind
1273 * of objects.
1274 */
1275 if ((one->mode ^ two->mode) & S_IFMT)
1276 goto free_ab_and_return;
1277 if (complete_rewrite) {
1278 emit_rewrite_diff(name_a, name_b, one, two,
1279 o->color_diff);
1280 o->found_changes = 1;
1281 goto free_ab_and_return;
1282 }
1283 }
1284
1285 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1286 die("unable to read files to diff");
1287
1288 if (!o->text &&
1289 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1290 /* Quite common confusing case */
1291 if (mf1.size == mf2.size &&
1292 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1293 goto free_ab_and_return;
1294 if (o->binary)
1295 emit_binary_diff(&mf1, &mf2);
1296 else
1297 printf("Binary files %s and %s differ\n",
1298 lbl[0], lbl[1]);
1299 o->found_changes = 1;
1300 }
1301 else {
1302 /* Crazy xdl interfaces.. */
1303 const char *diffopts = getenv("GIT_DIFF_OPTS");
1304 xpparam_t xpp;
1305 xdemitconf_t xecfg;
1306 xdemitcb_t ecb;
1307 struct emit_callback ecbdata;
1308 const char *funcname_pattern;
1309
1310 funcname_pattern = diff_funcname_pattern(one);
1311 if (!funcname_pattern)
1312 funcname_pattern = diff_funcname_pattern(two);
1313
1314 memset(&xecfg, 0, sizeof(xecfg));
1315 memset(&ecbdata, 0, sizeof(ecbdata));
1316 ecbdata.label_path = lbl;
1317 ecbdata.color_diff = o->color_diff;
1318 ecbdata.found_changesp = &o->found_changes;
1319 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1320 xecfg.ctxlen = o->context;
1321 xecfg.flags = XDL_EMIT_FUNCNAMES;
1322 if (funcname_pattern)
1323 xdiff_set_find_func(&xecfg, funcname_pattern);
1324 if (!diffopts)
1325 ;
1326 else if (!prefixcmp(diffopts, "--unified="))
1327 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1328 else if (!prefixcmp(diffopts, "-u"))
1329 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1330 ecb.outf = xdiff_outf;
1331 ecb.priv = &ecbdata;
1332 ecbdata.xm.consume = fn_out_consume;
1333 if (o->color_diff_words)
1334 ecbdata.diff_words =
1335 xcalloc(1, sizeof(struct diff_words_data));
1336 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1337 if (o->color_diff_words)
1338 free_diff_words_data(&ecbdata);
1339 }
1340
1341 free_ab_and_return:
1342 diff_free_filespec_data(one);
1343 diff_free_filespec_data(two);
1344 free(a_one);
1345 free(b_two);
1346 return;
1347 }
1348
1349 static void builtin_diffstat(const char *name_a, const char *name_b,
1350 struct diff_filespec *one,
1351 struct diff_filespec *two,
1352 struct diffstat_t *diffstat,
1353 struct diff_options *o,
1354 int complete_rewrite)
1355 {
1356 mmfile_t mf1, mf2;
1357 struct diffstat_file *data;
1358
1359 data = diffstat_add(diffstat, name_a, name_b);
1360
1361 if (!one || !two) {
1362 data->is_unmerged = 1;
1363 return;
1364 }
1365 if (complete_rewrite) {
1366 diff_populate_filespec(one, 0);
1367 diff_populate_filespec(two, 0);
1368 data->deleted = count_lines(one->data, one->size);
1369 data->added = count_lines(two->data, two->size);
1370 goto free_and_return;
1371 }
1372 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1373 die("unable to read files to diff");
1374
1375 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1376 data->is_binary = 1;
1377 data->added = mf2.size;
1378 data->deleted = mf1.size;
1379 } else {
1380 /* Crazy xdl interfaces.. */
1381 xpparam_t xpp;
1382 xdemitconf_t xecfg;
1383 xdemitcb_t ecb;
1384
1385 memset(&xecfg, 0, sizeof(xecfg));
1386 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1387 ecb.outf = xdiff_outf;
1388 ecb.priv = diffstat;
1389 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1390 }
1391
1392 free_and_return:
1393 diff_free_filespec_data(one);
1394 diff_free_filespec_data(two);
1395 }
1396
1397 static void builtin_checkdiff(const char *name_a, const char *name_b,
1398 struct diff_filespec *one,
1399 struct diff_filespec *two, struct diff_options *o)
1400 {
1401 mmfile_t mf1, mf2;
1402 struct checkdiff_t data;
1403
1404 if (!two)
1405 return;
1406
1407 memset(&data, 0, sizeof(data));
1408 data.xm.consume = checkdiff_consume;
1409 data.filename = name_b ? name_b : name_a;
1410 data.lineno = 0;
1411 data.color_diff = o->color_diff;
1412
1413 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1414 die("unable to read files to diff");
1415
1416 if (diff_filespec_is_binary(two))
1417 goto free_and_return;
1418 else {
1419 /* Crazy xdl interfaces.. */
1420 xpparam_t xpp;
1421 xdemitconf_t xecfg;
1422 xdemitcb_t ecb;
1423
1424 memset(&xecfg, 0, sizeof(xecfg));
1425 xpp.flags = XDF_NEED_MINIMAL;
1426 ecb.outf = xdiff_outf;
1427 ecb.priv = &data;
1428 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1429 }
1430 free_and_return:
1431 diff_free_filespec_data(one);
1432 diff_free_filespec_data(two);
1433 }
1434
1435 struct diff_filespec *alloc_filespec(const char *path)
1436 {
1437 int namelen = strlen(path);
1438 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1439
1440 memset(spec, 0, sizeof(*spec));
1441 spec->path = (char *)(spec + 1);
1442 memcpy(spec->path, path, namelen+1);
1443 return spec;
1444 }
1445
1446 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1447 unsigned short mode)
1448 {
1449 if (mode) {
1450 spec->mode = canon_mode(mode);
1451 hashcpy(spec->sha1, sha1);
1452 spec->sha1_valid = !is_null_sha1(sha1);
1453 }
1454 }
1455
1456 /*
1457 * Given a name and sha1 pair, if the index tells us the file in
1458 * the work tree has that object contents, return true, so that
1459 * prepare_temp_file() does not have to inflate and extract.
1460 */
1461 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1462 {
1463 struct cache_entry *ce;
1464 struct stat st;
1465 int pos, len;
1466
1467 /* We do not read the cache ourselves here, because the
1468 * benchmark with my previous version that always reads cache
1469 * shows that it makes things worse for diff-tree comparing
1470 * two linux-2.6 kernel trees in an already checked out work
1471 * tree. This is because most diff-tree comparisons deal with
1472 * only a small number of files, while reading the cache is
1473 * expensive for a large project, and its cost outweighs the
1474 * savings we get by not inflating the object to a temporary
1475 * file. Practically, this code only helps when we are used
1476 * by diff-cache --cached, which does read the cache before
1477 * calling us.
1478 */
1479 if (!active_cache)
1480 return 0;
1481
1482 /* We want to avoid the working directory if our caller
1483 * doesn't need the data in a normal file, this system
1484 * is rather slow with its stat/open/mmap/close syscalls,
1485 * and the object is contained in a pack file. The pack
1486 * is probably already open and will be faster to obtain
1487 * the data through than the working directory. Loose
1488 * objects however would tend to be slower as they need
1489 * to be individually opened and inflated.
1490 */
1491 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1492 return 0;
1493
1494 len = strlen(name);
1495 pos = cache_name_pos(name, len);
1496 if (pos < 0)
1497 return 0;
1498 ce = active_cache[pos];
1499 if ((lstat(name, &st) < 0) ||
1500 !S_ISREG(st.st_mode) || /* careful! */
1501 ce_match_stat(ce, &st, 0) ||
1502 hashcmp(sha1, ce->sha1))
1503 return 0;
1504 /* we return 1 only when we can stat, it is a regular file,
1505 * stat information matches, and sha1 recorded in the cache
1506 * matches. I.e. we know the file in the work tree really is
1507 * the same as the <name, sha1> pair.
1508 */
1509 return 1;
1510 }
1511
1512 static int populate_from_stdin(struct diff_filespec *s)
1513 {
1514 struct strbuf buf;
1515
1516 strbuf_init(&buf, 0);
1517 if (strbuf_read(&buf, 0, 0) < 0)
1518 return error("error while reading from stdin %s",
1519 strerror(errno));
1520
1521 s->should_munmap = 0;
1522 s->data = strbuf_detach(&buf, &s->size);
1523 s->should_free = 1;
1524 return 0;
1525 }
1526
1527 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1528 {
1529 int len;
1530 char *data = xmalloc(100);
1531 len = snprintf(data, 100,
1532 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1533 s->data = data;
1534 s->size = len;
1535 s->should_free = 1;
1536 if (size_only) {
1537 s->data = NULL;
1538 free(data);
1539 }
1540 return 0;
1541 }
1542
1543 /*
1544 * While doing rename detection and pickaxe operation, we may need to
1545 * grab the data for the blob (or file) for our own in-core comparison.
1546 * diff_filespec has data and size fields for this purpose.
1547 */
1548 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1549 {
1550 int err = 0;
1551 if (!DIFF_FILE_VALID(s))
1552 die("internal error: asking to populate invalid file.");
1553 if (S_ISDIR(s->mode))
1554 return -1;
1555
1556 if (s->data)
1557 return 0;
1558
1559 if (size_only && 0 < s->size)
1560 return 0;
1561
1562 if (S_ISGITLINK(s->mode))
1563 return diff_populate_gitlink(s, size_only);
1564
1565 if (!s->sha1_valid ||
1566 reuse_worktree_file(s->path, s->sha1, 0)) {
1567 struct strbuf buf;
1568 struct stat st;
1569 int fd;
1570
1571 if (!strcmp(s->path, "-"))
1572 return populate_from_stdin(s);
1573
1574 if (lstat(s->path, &st) < 0) {
1575 if (errno == ENOENT) {
1576 err_empty:
1577 err = -1;
1578 empty:
1579 s->data = (char *)"";
1580 s->size = 0;
1581 return err;
1582 }
1583 }
1584 s->size = xsize_t(st.st_size);
1585 if (!s->size)
1586 goto empty;
1587 if (size_only)
1588 return 0;
1589 if (S_ISLNK(st.st_mode)) {
1590 int ret;
1591 s->data = xmalloc(s->size);
1592 s->should_free = 1;
1593 ret = readlink(s->path, s->data, s->size);
1594 if (ret < 0) {
1595 free(s->data);
1596 goto err_empty;
1597 }
1598 return 0;
1599 }
1600 fd = open(s->path, O_RDONLY);
1601 if (fd < 0)
1602 goto err_empty;
1603 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1604 close(fd);
1605 s->should_munmap = 1;
1606
1607 /*
1608 * Convert from working tree format to canonical git format
1609 */
1610 strbuf_init(&buf, 0);
1611 if (convert_to_git(s->path, s->data, s->size, &buf)) {
1612 munmap(s->data, s->size);
1613 s->should_munmap = 0;
1614 s->data = strbuf_detach(&buf, &s->size);
1615 s->should_free = 1;
1616 }
1617 }
1618 else {
1619 enum object_type type;
1620 if (size_only)
1621 type = sha1_object_info(s->sha1, &s->size);
1622 else {
1623 s->data = read_sha1_file(s->sha1, &type, &s->size);
1624 s->should_free = 1;
1625 }
1626 }
1627 return 0;
1628 }
1629
1630 void diff_free_filespec_blob(struct diff_filespec *s)
1631 {
1632 if (s->should_free)
1633 free(s->data);
1634 else if (s->should_munmap)
1635 munmap(s->data, s->size);
1636
1637 if (s->should_free || s->should_munmap) {
1638 s->should_free = s->should_munmap = 0;
1639 s->data = NULL;
1640 }
1641 }
1642
1643 void diff_free_filespec_data(struct diff_filespec *s)
1644 {
1645 diff_free_filespec_blob(s);
1646 free(s->cnt_data);
1647 s->cnt_data = NULL;
1648 }
1649
1650 static void prep_temp_blob(struct diff_tempfile *temp,
1651 void *blob,
1652 unsigned long size,
1653 const unsigned char *sha1,
1654 int mode)
1655 {
1656 int fd;
1657
1658 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1659 if (fd < 0)
1660 die("unable to create temp-file: %s", strerror(errno));
1661 if (write_in_full(fd, blob, size) != size)
1662 die("unable to write temp-file");
1663 close(fd);
1664 temp->name = temp->tmp_path;
1665 strcpy(temp->hex, sha1_to_hex(sha1));
1666 temp->hex[40] = 0;
1667 sprintf(temp->mode, "%06o", mode);
1668 }
1669
1670 static void prepare_temp_file(const char *name,
1671 struct diff_tempfile *temp,
1672 struct diff_filespec *one)
1673 {
1674 if (!DIFF_FILE_VALID(one)) {
1675 not_a_valid_file:
1676 /* A '-' entry produces this for file-2, and
1677 * a '+' entry produces this for file-1.
1678 */
1679 temp->name = "/dev/null";
1680 strcpy(temp->hex, ".");
1681 strcpy(temp->mode, ".");
1682 return;
1683 }
1684
1685 if (!one->sha1_valid ||
1686 reuse_worktree_file(name, one->sha1, 1)) {
1687 struct stat st;
1688 if (lstat(name, &st) < 0) {
1689 if (errno == ENOENT)
1690 goto not_a_valid_file;
1691 die("stat(%s): %s", name, strerror(errno));
1692 }
1693 if (S_ISLNK(st.st_mode)) {
1694 int ret;
1695 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1696 size_t sz = xsize_t(st.st_size);
1697 if (sizeof(buf) <= st.st_size)
1698 die("symlink too long: %s", name);
1699 ret = readlink(name, buf, sz);
1700 if (ret < 0)
1701 die("readlink(%s)", name);
1702 prep_temp_blob(temp, buf, sz,
1703 (one->sha1_valid ?
1704 one->sha1 : null_sha1),
1705 (one->sha1_valid ?
1706 one->mode : S_IFLNK));
1707 }
1708 else {
1709 /* we can borrow from the file in the work tree */
1710 temp->name = name;
1711 if (!one->sha1_valid)
1712 strcpy(temp->hex, sha1_to_hex(null_sha1));
1713 else
1714 strcpy(temp->hex, sha1_to_hex(one->sha1));
1715 /* Even though we may sometimes borrow the
1716 * contents from the work tree, we always want
1717 * one->mode. mode is trustworthy even when
1718 * !(one->sha1_valid), as long as
1719 * DIFF_FILE_VALID(one).
1720 */
1721 sprintf(temp->mode, "%06o", one->mode);
1722 }
1723 return;
1724 }
1725 else {
1726 if (diff_populate_filespec(one, 0))
1727 die("cannot read data blob for %s", one->path);
1728 prep_temp_blob(temp, one->data, one->size,
1729 one->sha1, one->mode);
1730 }
1731 }
1732
1733 static void remove_tempfile(void)
1734 {
1735 int i;
1736
1737 for (i = 0; i < 2; i++)
1738 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1739 unlink(diff_temp[i].name);
1740 diff_temp[i].name = NULL;
1741 }
1742 }
1743
1744 static void remove_tempfile_on_signal(int signo)
1745 {
1746 remove_tempfile();
1747 signal(SIGINT, SIG_DFL);
1748 raise(signo);
1749 }
1750
1751 static int spawn_prog(const char *pgm, const char **arg)
1752 {
1753 pid_t pid;
1754 int status;
1755
1756 fflush(NULL);
1757 pid = fork();
1758 if (pid < 0)
1759 die("unable to fork");
1760 if (!pid) {
1761 execvp(pgm, (char *const*) arg);
1762 exit(255);
1763 }
1764
1765 while (waitpid(pid, &status, 0) < 0) {
1766 if (errno == EINTR)
1767 continue;
1768 return -1;
1769 }
1770
1771 /* Earlier we did not check the exit status because
1772 * diff exits non-zero if files are different, and
1773 * we are not interested in knowing that. It was a
1774 * mistake which made it harder to quit a diff-*
1775 * session that uses the git-apply-patch-script as
1776 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1777 * should also exit non-zero only when it wants to
1778 * abort the entire diff-* session.
1779 */
1780 if (WIFEXITED(status) && !WEXITSTATUS(status))
1781 return 0;
1782 return -1;
1783 }
1784
1785 /* An external diff command takes:
1786 *
1787 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1788 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1789 *
1790 */
1791 static void run_external_diff(const char *pgm,
1792 const char *name,
1793 const char *other,
1794 struct diff_filespec *one,
1795 struct diff_filespec *two,
1796 const char *xfrm_msg,
1797 int complete_rewrite)
1798 {
1799 const char *spawn_arg[10];
1800 struct diff_tempfile *temp = diff_temp;
1801 int retval;
1802 static int atexit_asked = 0;
1803 const char *othername;
1804 const char **arg = &spawn_arg[0];
1805
1806 othername = (other? other : name);
1807 if (one && two) {
1808 prepare_temp_file(name, &temp[0], one);
1809 prepare_temp_file(othername, &temp[1], two);
1810 if (! atexit_asked &&
1811 (temp[0].name == temp[0].tmp_path ||
1812 temp[1].name == temp[1].tmp_path)) {
1813 atexit_asked = 1;
1814 atexit(remove_tempfile);
1815 }
1816 signal(SIGINT, remove_tempfile_on_signal);
1817 }
1818
1819 if (one && two) {
1820 *arg++ = pgm;
1821 *arg++ = name;
1822 *arg++ = temp[0].name;
1823 *arg++ = temp[0].hex;
1824 *arg++ = temp[0].mode;
1825 *arg++ = temp[1].name;
1826 *arg++ = temp[1].hex;
1827 *arg++ = temp[1].mode;
1828 if (other) {
1829 *arg++ = other;
1830 *arg++ = xfrm_msg;
1831 }
1832 } else {
1833 *arg++ = pgm;
1834 *arg++ = name;
1835 }
1836 *arg = NULL;
1837 retval = spawn_prog(pgm, spawn_arg);
1838 remove_tempfile();
1839 if (retval) {
1840 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1841 exit(1);
1842 }
1843 }
1844
1845 static const char *external_diff_attr(const char *name)
1846 {
1847 struct git_attr_check attr_diff_check;
1848
1849 setup_diff_attr_check(&attr_diff_check);
1850 if (!git_checkattr(name, 1, &attr_diff_check)) {
1851 const char *value = attr_diff_check.value;
1852 if (!ATTR_TRUE(value) &&
1853 !ATTR_FALSE(value) &&
1854 !ATTR_UNSET(value)) {
1855 struct ll_diff_driver *drv;
1856
1857 read_config_if_needed();
1858 for (drv = user_diff; drv; drv = drv->next)
1859 if (!strcmp(drv->name, value))
1860 return drv->cmd;
1861 }
1862 }
1863 return NULL;
1864 }
1865
1866 static void run_diff_cmd(const char *pgm,
1867 const char *name,
1868 const char *other,
1869 struct diff_filespec *one,
1870 struct diff_filespec *two,
1871 const char *xfrm_msg,
1872 struct diff_options *o,
1873 int complete_rewrite)
1874 {
1875 if (!o->allow_external)
1876 pgm = NULL;
1877 else {
1878 const char *cmd = external_diff_attr(name);
1879 if (cmd)
1880 pgm = cmd;
1881 }
1882
1883 if (pgm) {
1884 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1885 complete_rewrite);
1886 return;
1887 }
1888 if (one && two)
1889 builtin_diff(name, other ? other : name,
1890 one, two, xfrm_msg, o, complete_rewrite);
1891 else
1892 printf("* Unmerged path %s\n", name);
1893 }
1894
1895 static void diff_fill_sha1_info(struct diff_filespec *one)
1896 {
1897 if (DIFF_FILE_VALID(one)) {
1898 if (!one->sha1_valid) {
1899 struct stat st;
1900 if (!strcmp(one->path, "-")) {
1901 hashcpy(one->sha1, null_sha1);
1902 return;
1903 }
1904 if (lstat(one->path, &st) < 0)
1905 die("stat %s", one->path);
1906 if (index_path(one->sha1, one->path, &st, 0))
1907 die("cannot hash %s\n", one->path);
1908 }
1909 }
1910 else
1911 hashclr(one->sha1);
1912 }
1913
1914 static int similarity_index(struct diff_filepair *p)
1915 {
1916 return p->score * 100 / MAX_SCORE;
1917 }
1918
1919 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1920 {
1921 const char *pgm = external_diff();
1922 struct strbuf msg;
1923 char *xfrm_msg;
1924 struct diff_filespec *one = p->one;
1925 struct diff_filespec *two = p->two;
1926 const char *name;
1927 const char *other;
1928 int complete_rewrite = 0;
1929
1930
1931 if (DIFF_PAIR_UNMERGED(p)) {
1932 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1933 return;
1934 }
1935
1936 name = p->one->path;
1937 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1938 diff_fill_sha1_info(one);
1939 diff_fill_sha1_info(two);
1940
1941 strbuf_init(&msg, PATH_MAX * 2 + 300);
1942 switch (p->status) {
1943 case DIFF_STATUS_COPIED:
1944 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1945 strbuf_addstr(&msg, "\ncopy from ");
1946 quote_c_style(name, &msg, NULL, 0);
1947 strbuf_addstr(&msg, "\ncopy to ");
1948 quote_c_style(other, &msg, NULL, 0);
1949 strbuf_addch(&msg, '\n');
1950 break;
1951 case DIFF_STATUS_RENAMED:
1952 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1953 strbuf_addstr(&msg, "\nrename from ");
1954 quote_c_style(name, &msg, NULL, 0);
1955 strbuf_addstr(&msg, "\nrename to ");
1956 quote_c_style(other, &msg, NULL, 0);
1957 strbuf_addch(&msg, '\n');
1958 break;
1959 case DIFF_STATUS_MODIFIED:
1960 if (p->score) {
1961 strbuf_addf(&msg, "dissimilarity index %d%%\n",
1962 similarity_index(p));
1963 complete_rewrite = 1;
1964 break;
1965 }
1966 /* fallthru */
1967 default:
1968 /* nothing */
1969 ;
1970 }
1971
1972 if (hashcmp(one->sha1, two->sha1)) {
1973 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1974
1975 if (o->binary) {
1976 mmfile_t mf;
1977 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
1978 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
1979 abbrev = 40;
1980 }
1981 strbuf_addf(&msg, "index %.*s..%.*s",
1982 abbrev, sha1_to_hex(one->sha1),
1983 abbrev, sha1_to_hex(two->sha1));
1984 if (one->mode == two->mode)
1985 strbuf_addf(&msg, " %06o", one->mode);
1986 strbuf_addch(&msg, '\n');
1987 }
1988
1989 if (msg.len)
1990 strbuf_setlen(&msg, msg.len - 1);
1991 xfrm_msg = msg.len ? msg.buf : NULL;
1992
1993 if (!pgm &&
1994 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1995 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1996 /* a filepair that changes between file and symlink
1997 * needs to be split into deletion and creation.
1998 */
1999 struct diff_filespec *null = alloc_filespec(two->path);
2000 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
2001 free(null);
2002 null = alloc_filespec(one->path);
2003 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
2004 free(null);
2005 }
2006 else
2007 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
2008 complete_rewrite);
2009
2010 strbuf_release(&msg);
2011 }
2012
2013 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2014 struct diffstat_t *diffstat)
2015 {
2016 const char *name;
2017 const char *other;
2018 int complete_rewrite = 0;
2019
2020 if (DIFF_PAIR_UNMERGED(p)) {
2021 /* unmerged */
2022 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2023 return;
2024 }
2025
2026 name = p->one->path;
2027 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2028
2029 diff_fill_sha1_info(p->one);
2030 diff_fill_sha1_info(p->two);
2031
2032 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2033 complete_rewrite = 1;
2034 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2035 }
2036
2037 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2038 {
2039 const char *name;
2040 const char *other;
2041
2042 if (DIFF_PAIR_UNMERGED(p)) {
2043 /* unmerged */
2044 return;
2045 }
2046
2047 name = p->one->path;
2048 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2049
2050 diff_fill_sha1_info(p->one);
2051 diff_fill_sha1_info(p->two);
2052
2053 builtin_checkdiff(name, other, p->one, p->two, o);
2054 }
2055
2056 void diff_setup(struct diff_options *options)
2057 {
2058 memset(options, 0, sizeof(*options));
2059 options->line_termination = '\n';
2060 options->break_opt = -1;
2061 options->rename_limit = -1;
2062 options->context = 3;
2063 options->msg_sep = "";
2064
2065 options->change = diff_change;
2066 options->add_remove = diff_addremove;
2067 options->color_diff = diff_use_color_default;
2068 options->detect_rename = diff_detect_rename_default;
2069 }
2070
2071 int diff_setup_done(struct diff_options *options)
2072 {
2073 int count = 0;
2074
2075 if (options->output_format & DIFF_FORMAT_NAME)
2076 count++;
2077 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2078 count++;
2079 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2080 count++;
2081 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2082 count++;
2083 if (count > 1)
2084 die("--name-only, --name-status, --check and -s are mutually exclusive");
2085
2086 if (options->find_copies_harder)
2087 options->detect_rename = DIFF_DETECT_COPY;
2088
2089 if (options->output_format & (DIFF_FORMAT_NAME |
2090 DIFF_FORMAT_NAME_STATUS |
2091 DIFF_FORMAT_CHECKDIFF |
2092 DIFF_FORMAT_NO_OUTPUT))
2093 options->output_format &= ~(DIFF_FORMAT_RAW |
2094 DIFF_FORMAT_NUMSTAT |
2095 DIFF_FORMAT_DIFFSTAT |
2096 DIFF_FORMAT_SHORTSTAT |
2097 DIFF_FORMAT_SUMMARY |
2098 DIFF_FORMAT_PATCH);
2099
2100 /*
2101 * These cases always need recursive; we do not drop caller-supplied
2102 * recursive bits for other formats here.
2103 */
2104 if (options->output_format & (DIFF_FORMAT_PATCH |
2105 DIFF_FORMAT_NUMSTAT |
2106 DIFF_FORMAT_DIFFSTAT |
2107 DIFF_FORMAT_SHORTSTAT |
2108 DIFF_FORMAT_SUMMARY |
2109 DIFF_FORMAT_CHECKDIFF))
2110 options->recursive = 1;
2111 /*
2112 * Also pickaxe would not work very well if you do not say recursive
2113 */
2114 if (options->pickaxe)
2115 options->recursive = 1;
2116
2117 if (options->detect_rename && options->rename_limit < 0)
2118 options->rename_limit = diff_rename_limit_default;
2119 if (options->setup & DIFF_SETUP_USE_CACHE) {
2120 if (!active_cache)
2121 /* read-cache does not die even when it fails
2122 * so it is safe for us to do this here. Also
2123 * it does not smudge active_cache or active_nr
2124 * when it fails, so we do not have to worry about
2125 * cleaning it up ourselves either.
2126 */
2127 read_cache();
2128 }
2129 if (options->abbrev <= 0 || 40 < options->abbrev)
2130 options->abbrev = 40; /* full */
2131
2132 /*
2133 * It does not make sense to show the first hit we happened
2134 * to have found. It does not make sense not to return with
2135 * exit code in such a case either.
2136 */
2137 if (options->quiet) {
2138 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2139 options->exit_with_status = 1;
2140 }
2141
2142 /*
2143 * If we postprocess in diffcore, we cannot simply return
2144 * upon the first hit. We need to run diff as usual.
2145 */
2146 if (options->pickaxe || options->filter)
2147 options->quiet = 0;
2148
2149 return 0;
2150 }
2151
2152 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2153 {
2154 char c, *eq;
2155 int len;
2156
2157 if (*arg != '-')
2158 return 0;
2159 c = *++arg;
2160 if (!c)
2161 return 0;
2162 if (c == arg_short) {
2163 c = *++arg;
2164 if (!c)
2165 return 1;
2166 if (val && isdigit(c)) {
2167 char *end;
2168 int n = strtoul(arg, &end, 10);
2169 if (*end)
2170 return 0;
2171 *val = n;
2172 return 1;
2173 }
2174 return 0;
2175 }
2176 if (c != '-')
2177 return 0;
2178 arg++;
2179 eq = strchr(arg, '=');
2180 if (eq)
2181 len = eq - arg;
2182 else
2183 len = strlen(arg);
2184 if (!len || strncmp(arg, arg_long, len))
2185 return 0;
2186 if (eq) {
2187 int n;
2188 char *end;
2189 if (!isdigit(*++eq))
2190 return 0;
2191 n = strtoul(eq, &end, 10);
2192 if (*end)
2193 return 0;
2194 *val = n;
2195 }
2196 return 1;
2197 }
2198
2199 static int diff_scoreopt_parse(const char *opt);
2200
2201 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2202 {
2203 const char *arg = av[0];
2204 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2205 options->output_format |= DIFF_FORMAT_PATCH;
2206 else if (opt_arg(arg, 'U', "unified", &options->context))
2207 options->output_format |= DIFF_FORMAT_PATCH;
2208 else if (!strcmp(arg, "--raw"))
2209 options->output_format |= DIFF_FORMAT_RAW;
2210 else if (!strcmp(arg, "--patch-with-raw")) {
2211 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2212 }
2213 else if (!strcmp(arg, "--numstat")) {
2214 options->output_format |= DIFF_FORMAT_NUMSTAT;
2215 }
2216 else if (!strcmp(arg, "--shortstat")) {
2217 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2218 }
2219 else if (!prefixcmp(arg, "--stat")) {
2220 char *end;
2221 int width = options->stat_width;
2222 int name_width = options->stat_name_width;
2223 arg += 6;
2224 end = (char *)arg;
2225
2226 switch (*arg) {
2227 case '-':
2228 if (!prefixcmp(arg, "-width="))
2229 width = strtoul(arg + 7, &end, 10);
2230 else if (!prefixcmp(arg, "-name-width="))
2231 name_width = strtoul(arg + 12, &end, 10);
2232 break;
2233 case '=':
2234 width = strtoul(arg+1, &end, 10);
2235 if (*end == ',')
2236 name_width = strtoul(end+1, &end, 10);
2237 }
2238
2239 /* Important! This checks all the error cases! */
2240 if (*end)
2241 return 0;
2242 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2243 options->stat_name_width = name_width;
2244 options->stat_width = width;
2245 }
2246 else if (!strcmp(arg, "--check"))
2247 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2248 else if (!strcmp(arg, "--summary"))
2249 options->output_format |= DIFF_FORMAT_SUMMARY;
2250 else if (!strcmp(arg, "--patch-with-stat")) {
2251 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2252 }
2253 else if (!strcmp(arg, "-z"))
2254 options->line_termination = 0;
2255 else if (!prefixcmp(arg, "-l"))
2256 options->rename_limit = strtoul(arg+2, NULL, 10);
2257 else if (!strcmp(arg, "--full-index"))
2258 options->full_index = 1;
2259 else if (!strcmp(arg, "--binary")) {
2260 options->output_format |= DIFF_FORMAT_PATCH;
2261 options->binary = 1;
2262 }
2263 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
2264 options->text = 1;
2265 }
2266 else if (!strcmp(arg, "--name-only"))
2267 options->output_format |= DIFF_FORMAT_NAME;
2268 else if (!strcmp(arg, "--name-status"))
2269 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2270 else if (!strcmp(arg, "-R"))
2271 options->reverse_diff = 1;
2272 else if (!prefixcmp(arg, "-S"))
2273 options->pickaxe = arg + 2;
2274 else if (!strcmp(arg, "-s")) {
2275 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2276 }
2277 else if (!prefixcmp(arg, "-O"))
2278 options->orderfile = arg + 2;
2279 else if (!prefixcmp(arg, "--diff-filter="))
2280 options->filter = arg + 14;
2281 else if (!strcmp(arg, "--pickaxe-all"))
2282 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2283 else if (!strcmp(arg, "--pickaxe-regex"))
2284 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2285 else if (!prefixcmp(arg, "-B")) {
2286 if ((options->break_opt =
2287 diff_scoreopt_parse(arg)) == -1)
2288 return -1;
2289 }
2290 else if (!prefixcmp(arg, "-M")) {
2291 if ((options->rename_score =
2292 diff_scoreopt_parse(arg)) == -1)
2293 return -1;
2294 options->detect_rename = DIFF_DETECT_RENAME;
2295 }
2296 else if (!prefixcmp(arg, "-C")) {
2297 if (options->detect_rename == DIFF_DETECT_COPY)
2298 options->find_copies_harder = 1;
2299 if ((options->rename_score =
2300 diff_scoreopt_parse(arg)) == -1)
2301 return -1;
2302 options->detect_rename = DIFF_DETECT_COPY;
2303 }
2304 else if (!strcmp(arg, "--find-copies-harder"))
2305 options->find_copies_harder = 1;
2306 else if (!strcmp(arg, "--follow"))
2307 options->follow_renames = 1;
2308 else if (!strcmp(arg, "--abbrev"))
2309 options->abbrev = DEFAULT_ABBREV;
2310 else if (!prefixcmp(arg, "--abbrev=")) {
2311 options->abbrev = strtoul(arg + 9, NULL, 10);
2312 if (options->abbrev < MINIMUM_ABBREV)
2313 options->abbrev = MINIMUM_ABBREV;
2314 else if (40 < options->abbrev)
2315 options->abbrev = 40;
2316 }
2317 else if (!strcmp(arg, "--color"))
2318 options->color_diff = 1;
2319 else if (!strcmp(arg, "--no-color"))
2320 options->color_diff = 0;
2321 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2322 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2323 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2324 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2325 else if (!strcmp(arg, "--ignore-space-at-eol"))
2326 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2327 else if (!strcmp(arg, "--color-words"))
2328 options->color_diff = options->color_diff_words = 1;
2329 else if (!strcmp(arg, "--no-renames"))
2330 options->detect_rename = 0;
2331 else if (!strcmp(arg, "--exit-code"))
2332 options->exit_with_status = 1;
2333 else if (!strcmp(arg, "--quiet"))
2334 options->quiet = 1;
2335 else if (!strcmp(arg, "--ext-diff"))
2336 options->allow_external = 1;
2337 else if (!strcmp(arg, "--no-ext-diff"))
2338 options->allow_external = 0;
2339 else
2340 return 0;
2341 return 1;
2342 }
2343
2344 static int parse_num(const char **cp_p)
2345 {
2346 unsigned long num, scale;
2347 int ch, dot;
2348 const char *cp = *cp_p;
2349
2350 num = 0;
2351 scale = 1;
2352 dot = 0;
2353 for(;;) {
2354 ch = *cp;
2355 if ( !dot && ch == '.' ) {
2356 scale = 1;
2357 dot = 1;
2358 } else if ( ch == '%' ) {
2359 scale = dot ? scale*100 : 100;
2360 cp++; /* % is always at the end */
2361 break;
2362 } else if ( ch >= '0' && ch <= '9' ) {
2363 if ( scale < 100000 ) {
2364 scale *= 10;
2365 num = (num*10) + (ch-'0');
2366 }
2367 } else {
2368 break;
2369 }
2370 cp++;
2371 }
2372 *cp_p = cp;
2373
2374 /* user says num divided by scale and we say internally that
2375 * is MAX_SCORE * num / scale.
2376 */
2377 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2378 }
2379
2380 static int diff_scoreopt_parse(const char *opt)
2381 {
2382 int opt1, opt2, cmd;
2383
2384 if (*opt++ != '-')
2385 return -1;
2386 cmd = *opt++;
2387 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2388 return -1; /* that is not a -M, -C nor -B option */
2389
2390 opt1 = parse_num(&opt);
2391 if (cmd != 'B')
2392 opt2 = 0;
2393 else {
2394 if (*opt == 0)
2395 opt2 = 0;
2396 else if (*opt != '/')
2397 return -1; /* we expect -B80/99 or -B80 */
2398 else {
2399 opt++;
2400 opt2 = parse_num(&opt);
2401 }
2402 }
2403 if (*opt != 0)
2404 return -1;
2405 return opt1 | (opt2 << 16);
2406 }
2407
2408 struct diff_queue_struct diff_queued_diff;
2409
2410 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2411 {
2412 if (queue->alloc <= queue->nr) {
2413 queue->alloc = alloc_nr(queue->alloc);
2414 queue->queue = xrealloc(queue->queue,
2415 sizeof(dp) * queue->alloc);
2416 }
2417 queue->queue[queue->nr++] = dp;
2418 }
2419
2420 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2421 struct diff_filespec *one,
2422 struct diff_filespec *two)
2423 {
2424 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2425 dp->one = one;
2426 dp->two = two;
2427 if (queue)
2428 diff_q(queue, dp);
2429 return dp;
2430 }
2431
2432 void diff_free_filepair(struct diff_filepair *p)
2433 {
2434 diff_free_filespec_data(p->one);
2435 diff_free_filespec_data(p->two);
2436 free(p->one);
2437 free(p->two);
2438 free(p);
2439 }
2440
2441 /* This is different from find_unique_abbrev() in that
2442 * it stuffs the result with dots for alignment.
2443 */
2444 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2445 {
2446 int abblen;
2447 const char *abbrev;
2448 if (len == 40)
2449 return sha1_to_hex(sha1);
2450
2451 abbrev = find_unique_abbrev(sha1, len);
2452 if (!abbrev)
2453 return sha1_to_hex(sha1);
2454 abblen = strlen(abbrev);
2455 if (abblen < 37) {
2456 static char hex[41];
2457 if (len < abblen && abblen <= len + 2)
2458 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2459 else
2460 sprintf(hex, "%s...", abbrev);
2461 return hex;
2462 }
2463 return sha1_to_hex(sha1);
2464 }
2465
2466 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2467 {
2468 int line_termination = opt->line_termination;
2469 int inter_name_termination = line_termination ? '\t' : '\0';
2470
2471 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2472 printf(":%06o %06o %s ", p->one->mode, p->two->mode,
2473 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2474 printf("%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2475 }
2476 if (p->score) {
2477 printf("%c%03d%c", p->status, similarity_index(p),
2478 inter_name_termination);
2479 } else {
2480 printf("%c%c", p->status, inter_name_termination);
2481 }
2482
2483 if (p->status == DIFF_STATUS_COPIED || p->status == DIFF_STATUS_RENAMED) {
2484 write_name_quoted(p->one->path, stdout, inter_name_termination);
2485 write_name_quoted(p->two->path, stdout, line_termination);
2486 } else {
2487 const char *path = p->one->mode ? p->one->path : p->two->path;
2488 write_name_quoted(path, stdout, line_termination);
2489 }
2490 }
2491
2492 int diff_unmodified_pair(struct diff_filepair *p)
2493 {
2494 /* This function is written stricter than necessary to support
2495 * the currently implemented transformers, but the idea is to
2496 * let transformers to produce diff_filepairs any way they want,
2497 * and filter and clean them up here before producing the output.
2498 */
2499 struct diff_filespec *one = p->one, *two = p->two;
2500
2501 if (DIFF_PAIR_UNMERGED(p))
2502 return 0; /* unmerged is interesting */
2503
2504 /* deletion, addition, mode or type change
2505 * and rename are all interesting.
2506 */
2507 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2508 DIFF_PAIR_MODE_CHANGED(p) ||
2509 strcmp(one->path, two->path))
2510 return 0;
2511
2512 /* both are valid and point at the same path. that is, we are
2513 * dealing with a change.
2514 */
2515 if (one->sha1_valid && two->sha1_valid &&
2516 !hashcmp(one->sha1, two->sha1))
2517 return 1; /* no change */
2518 if (!one->sha1_valid && !two->sha1_valid)
2519 return 1; /* both look at the same file on the filesystem. */
2520 return 0;
2521 }
2522
2523 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2524 {
2525 if (diff_unmodified_pair(p))
2526 return;
2527
2528 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2529 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2530 return; /* no tree diffs in patch format */
2531
2532 run_diff(p, o);
2533 }
2534
2535 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2536 struct diffstat_t *diffstat)
2537 {
2538 if (diff_unmodified_pair(p))
2539 return;
2540
2541 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2542 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2543 return; /* no tree diffs in patch format */
2544
2545 run_diffstat(p, o, diffstat);
2546 }
2547
2548 static void diff_flush_checkdiff(struct diff_filepair *p,
2549 struct diff_options *o)
2550 {
2551 if (diff_unmodified_pair(p))
2552 return;
2553
2554 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2555 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2556 return; /* no tree diffs in patch format */
2557
2558 run_checkdiff(p, o);
2559 }
2560
2561 int diff_queue_is_empty(void)
2562 {
2563 struct diff_queue_struct *q = &diff_queued_diff;
2564 int i;
2565 for (i = 0; i < q->nr; i++)
2566 if (!diff_unmodified_pair(q->queue[i]))
2567 return 0;
2568 return 1;
2569 }
2570
2571 #if DIFF_DEBUG
2572 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2573 {
2574 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2575 x, one ? one : "",
2576 s->path,
2577 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2578 s->mode,
2579 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2580 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2581 x, one ? one : "",
2582 s->size, s->xfrm_flags);
2583 }
2584
2585 void diff_debug_filepair(const struct diff_filepair *p, int i)
2586 {
2587 diff_debug_filespec(p->one, i, "one");
2588 diff_debug_filespec(p->two, i, "two");
2589 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2590 p->score, p->status ? p->status : '?',
2591 p->source_stays, p->broken_pair);
2592 }
2593
2594 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2595 {
2596 int i;
2597 if (msg)
2598 fprintf(stderr, "%s\n", msg);
2599 fprintf(stderr, "q->nr = %d\n", q->nr);
2600 for (i = 0; i < q->nr; i++) {
2601 struct diff_filepair *p = q->queue[i];
2602 diff_debug_filepair(p, i);
2603 }
2604 }
2605 #endif
2606
2607 static void diff_resolve_rename_copy(void)
2608 {
2609 int i, j;
2610 struct diff_filepair *p, *pp;
2611 struct diff_queue_struct *q = &diff_queued_diff;
2612
2613 diff_debug_queue("resolve-rename-copy", q);
2614
2615 for (i = 0; i < q->nr; i++) {
2616 p = q->queue[i];
2617 p->status = 0; /* undecided */
2618 if (DIFF_PAIR_UNMERGED(p))
2619 p->status = DIFF_STATUS_UNMERGED;
2620 else if (!DIFF_FILE_VALID(p->one))
2621 p->status = DIFF_STATUS_ADDED;
2622 else if (!DIFF_FILE_VALID(p->two))
2623 p->status = DIFF_STATUS_DELETED;
2624 else if (DIFF_PAIR_TYPE_CHANGED(p))
2625 p->status = DIFF_STATUS_TYPE_CHANGED;
2626
2627 /* from this point on, we are dealing with a pair
2628 * whose both sides are valid and of the same type, i.e.
2629 * either in-place edit or rename/copy edit.
2630 */
2631 else if (DIFF_PAIR_RENAME(p)) {
2632 if (p->source_stays) {
2633 p->status = DIFF_STATUS_COPIED;
2634 continue;
2635 }
2636 /* See if there is some other filepair that
2637 * copies from the same source as us. If so
2638 * we are a copy. Otherwise we are either a
2639 * copy if the path stays, or a rename if it
2640 * does not, but we already handled "stays" case.
2641 */
2642 for (j = i + 1; j < q->nr; j++) {
2643 pp = q->queue[j];
2644 if (strcmp(pp->one->path, p->one->path))
2645 continue; /* not us */
2646 if (!DIFF_PAIR_RENAME(pp))
2647 continue; /* not a rename/copy */
2648 /* pp is a rename/copy from the same source */
2649 p->status = DIFF_STATUS_COPIED;
2650 break;
2651 }
2652 if (!p->status)
2653 p->status = DIFF_STATUS_RENAMED;
2654 }
2655 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2656 p->one->mode != p->two->mode ||
2657 is_null_sha1(p->one->sha1))
2658 p->status = DIFF_STATUS_MODIFIED;
2659 else {
2660 /* This is a "no-change" entry and should not
2661 * happen anymore, but prepare for broken callers.
2662 */
2663 error("feeding unmodified %s to diffcore",
2664 p->one->path);
2665 p->status = DIFF_STATUS_UNKNOWN;
2666 }
2667 }
2668 diff_debug_queue("resolve-rename-copy done", q);
2669 }
2670
2671 static int check_pair_status(struct diff_filepair *p)
2672 {
2673 switch (p->status) {
2674 case DIFF_STATUS_UNKNOWN:
2675 return 0;
2676 case 0:
2677 die("internal error in diff-resolve-rename-copy");
2678 default:
2679 return 1;
2680 }
2681 }
2682
2683 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2684 {
2685 int fmt = opt->output_format;
2686
2687 if (fmt & DIFF_FORMAT_CHECKDIFF)
2688 diff_flush_checkdiff(p, opt);
2689 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2690 diff_flush_raw(p, opt);
2691 else if (fmt & DIFF_FORMAT_NAME)
2692 write_name_quoted(p->two->path, stdout, opt->line_termination);
2693 }
2694
2695 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2696 {
2697 if (fs->mode)
2698 printf(" %s mode %06o ", newdelete, fs->mode);
2699 else
2700 printf(" %s ", newdelete);
2701 write_name_quoted(fs->path, stdout, '\n');
2702 }
2703
2704
2705 static void show_mode_change(struct diff_filepair *p, int show_name)
2706 {
2707 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2708 printf(" mode change %06o => %06o%c", p->one->mode, p->two->mode,
2709 show_name ? ' ' : '\n');
2710 if (show_name) {
2711 write_name_quoted(p->two->path, stdout, '\n');
2712 }
2713 }
2714 }
2715
2716 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2717 {
2718 char *names = pprint_rename(p->one->path, p->two->path);
2719
2720 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2721 free(names);
2722 show_mode_change(p, 0);
2723 }
2724
2725 static void diff_summary(struct diff_filepair *p)
2726 {
2727 switch(p->status) {
2728 case DIFF_STATUS_DELETED:
2729 show_file_mode_name("delete", p->one);
2730 break;
2731 case DIFF_STATUS_ADDED:
2732 show_file_mode_name("create", p->two);
2733 break;
2734 case DIFF_STATUS_COPIED:
2735 show_rename_copy("copy", p);
2736 break;
2737 case DIFF_STATUS_RENAMED:
2738 show_rename_copy("rename", p);
2739 break;
2740 default:
2741 if (p->score) {
2742 puts(" rewrite ");
2743 write_name_quoted(p->two->path, stdout, ' ');
2744 printf("(%d%%)\n", similarity_index(p));
2745 }
2746 show_mode_change(p, !p->score);
2747 break;
2748 }
2749 }
2750
2751 struct patch_id_t {
2752 struct xdiff_emit_state xm;
2753 SHA_CTX *ctx;
2754 int patchlen;
2755 };
2756
2757 static int remove_space(char *line, int len)
2758 {
2759 int i;
2760 char *dst = line;
2761 unsigned char c;
2762
2763 for (i = 0; i < len; i++)
2764 if (!isspace((c = line[i])))
2765 *dst++ = c;
2766
2767 return dst - line;
2768 }
2769
2770 static void patch_id_consume(void *priv, char *line, unsigned long len)
2771 {
2772 struct patch_id_t *data = priv;
2773 int new_len;
2774
2775 /* Ignore line numbers when computing the SHA1 of the patch */
2776 if (!prefixcmp(line, "@@ -"))
2777 return;
2778
2779 new_len = remove_space(line, len);
2780
2781 SHA1_Update(data->ctx, line, new_len);
2782 data->patchlen += new_len;
2783 }
2784
2785 /* returns 0 upon success, and writes result into sha1 */
2786 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2787 {
2788 struct diff_queue_struct *q = &diff_queued_diff;
2789 int i;
2790 SHA_CTX ctx;
2791 struct patch_id_t data;
2792 char buffer[PATH_MAX * 4 + 20];
2793
2794 SHA1_Init(&ctx);
2795 memset(&data, 0, sizeof(struct patch_id_t));
2796 data.ctx = &ctx;
2797 data.xm.consume = patch_id_consume;
2798
2799 for (i = 0; i < q->nr; i++) {
2800 xpparam_t xpp;
2801 xdemitconf_t xecfg;
2802 xdemitcb_t ecb;
2803 mmfile_t mf1, mf2;
2804 struct diff_filepair *p = q->queue[i];
2805 int len1, len2;
2806
2807 memset(&xecfg, 0, sizeof(xecfg));
2808 if (p->status == 0)
2809 return error("internal diff status error");
2810 if (p->status == DIFF_STATUS_UNKNOWN)
2811 continue;
2812 if (diff_unmodified_pair(p))
2813 continue;
2814 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2815 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2816 continue;
2817 if (DIFF_PAIR_UNMERGED(p))
2818 continue;
2819
2820 diff_fill_sha1_info(p->one);
2821 diff_fill_sha1_info(p->two);
2822 if (fill_mmfile(&mf1, p->one) < 0 ||
2823 fill_mmfile(&mf2, p->two) < 0)
2824 return error("unable to read files to diff");
2825
2826 len1 = remove_space(p->one->path, strlen(p->one->path));
2827 len2 = remove_space(p->two->path, strlen(p->two->path));
2828 if (p->one->mode == 0)
2829 len1 = snprintf(buffer, sizeof(buffer),
2830 "diff--gita/%.*sb/%.*s"
2831 "newfilemode%06o"
2832 "---/dev/null"
2833 "+++b/%.*s",
2834 len1, p->one->path,
2835 len2, p->two->path,
2836 p->two->mode,
2837 len2, p->two->path);
2838 else if (p->two->mode == 0)
2839 len1 = snprintf(buffer, sizeof(buffer),
2840 "diff--gita/%.*sb/%.*s"
2841 "deletedfilemode%06o"
2842 "---a/%.*s"
2843 "+++/dev/null",
2844 len1, p->one->path,
2845 len2, p->two->path,
2846 p->one->mode,
2847 len1, p->one->path);
2848 else
2849 len1 = snprintf(buffer, sizeof(buffer),
2850 "diff--gita/%.*sb/%.*s"
2851 "---a/%.*s"
2852 "+++b/%.*s",
2853 len1, p->one->path,
2854 len2, p->two->path,
2855 len1, p->one->path,
2856 len2, p->two->path);
2857 SHA1_Update(&ctx, buffer, len1);
2858
2859 xpp.flags = XDF_NEED_MINIMAL;
2860 xecfg.ctxlen = 3;
2861 xecfg.flags = XDL_EMIT_FUNCNAMES;
2862 ecb.outf = xdiff_outf;
2863 ecb.priv = &data;
2864 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2865 }
2866
2867 SHA1_Final(sha1, &ctx);
2868 return 0;
2869 }
2870
2871 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2872 {
2873 struct diff_queue_struct *q = &diff_queued_diff;
2874 int i;
2875 int result = diff_get_patch_id(options, sha1);
2876
2877 for (i = 0; i < q->nr; i++)
2878 diff_free_filepair(q->queue[i]);
2879
2880 free(q->queue);
2881 q->queue = NULL;
2882 q->nr = q->alloc = 0;
2883
2884 return result;
2885 }
2886
2887 static int is_summary_empty(const struct diff_queue_struct *q)
2888 {
2889 int i;
2890
2891 for (i = 0; i < q->nr; i++) {
2892 const struct diff_filepair *p = q->queue[i];
2893
2894 switch (p->status) {
2895 case DIFF_STATUS_DELETED:
2896 case DIFF_STATUS_ADDED:
2897 case DIFF_STATUS_COPIED:
2898 case DIFF_STATUS_RENAMED:
2899 return 0;
2900 default:
2901 if (p->score)
2902 return 0;
2903 if (p->one->mode && p->two->mode &&
2904 p->one->mode != p->two->mode)
2905 return 0;
2906 break;
2907 }
2908 }
2909 return 1;
2910 }
2911
2912 void diff_flush(struct diff_options *options)
2913 {
2914 struct diff_queue_struct *q = &diff_queued_diff;
2915 int i, output_format = options->output_format;
2916 int separator = 0;
2917
2918 /*
2919 * Order: raw, stat, summary, patch
2920 * or: name/name-status/checkdiff (other bits clear)
2921 */
2922 if (!q->nr)
2923 goto free_queue;
2924
2925 if (output_format & (DIFF_FORMAT_RAW |
2926 DIFF_FORMAT_NAME |
2927 DIFF_FORMAT_NAME_STATUS |
2928 DIFF_FORMAT_CHECKDIFF)) {
2929 for (i = 0; i < q->nr; i++) {
2930 struct diff_filepair *p = q->queue[i];
2931 if (check_pair_status(p))
2932 flush_one_pair(p, options);
2933 }
2934 separator++;
2935 }
2936
2937 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2938 struct diffstat_t diffstat;
2939
2940 memset(&diffstat, 0, sizeof(struct diffstat_t));
2941 diffstat.xm.consume = diffstat_consume;
2942 for (i = 0; i < q->nr; i++) {
2943 struct diff_filepair *p = q->queue[i];
2944 if (check_pair_status(p))
2945 diff_flush_stat(p, options, &diffstat);
2946 }
2947 if (output_format & DIFF_FORMAT_NUMSTAT)
2948 show_numstat(&diffstat, options);
2949 if (output_format & DIFF_FORMAT_DIFFSTAT)
2950 show_stats(&diffstat, options);
2951 else if (output_format & DIFF_FORMAT_SHORTSTAT)
2952 show_shortstats(&diffstat);
2953 separator++;
2954 }
2955
2956 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2957 for (i = 0; i < q->nr; i++)
2958 diff_summary(q->queue[i]);
2959 separator++;
2960 }
2961
2962 if (output_format & DIFF_FORMAT_PATCH) {
2963 if (separator) {
2964 if (options->stat_sep) {
2965 /* attach patch instead of inline */
2966 fputs(options->stat_sep, stdout);
2967 } else {
2968 putchar(options->line_termination);
2969 }
2970 }
2971
2972 for (i = 0; i < q->nr; i++) {
2973 struct diff_filepair *p = q->queue[i];
2974 if (check_pair_status(p))
2975 diff_flush_patch(p, options);
2976 }
2977 }
2978
2979 if (output_format & DIFF_FORMAT_CALLBACK)
2980 options->format_callback(q, options, options->format_callback_data);
2981
2982 for (i = 0; i < q->nr; i++)
2983 diff_free_filepair(q->queue[i]);
2984 free_queue:
2985 free(q->queue);
2986 q->queue = NULL;
2987 q->nr = q->alloc = 0;
2988 }
2989
2990 static void diffcore_apply_filter(const char *filter)
2991 {
2992 int i;
2993 struct diff_queue_struct *q = &diff_queued_diff;
2994 struct diff_queue_struct outq;
2995 outq.queue = NULL;
2996 outq.nr = outq.alloc = 0;
2997
2998 if (!filter)
2999 return;
3000
3001 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3002 int found;
3003 for (i = found = 0; !found && i < q->nr; i++) {
3004 struct diff_filepair *p = q->queue[i];
3005 if (((p->status == DIFF_STATUS_MODIFIED) &&
3006 ((p->score &&
3007 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3008 (!p->score &&
3009 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3010 ((p->status != DIFF_STATUS_MODIFIED) &&
3011 strchr(filter, p->status)))
3012 found++;
3013 }
3014 if (found)
3015 return;
3016
3017 /* otherwise we will clear the whole queue
3018 * by copying the empty outq at the end of this
3019 * function, but first clear the current entries
3020 * in the queue.
3021 */
3022 for (i = 0; i < q->nr; i++)
3023 diff_free_filepair(q->queue[i]);
3024 }
3025 else {
3026 /* Only the matching ones */
3027 for (i = 0; i < q->nr; i++) {
3028 struct diff_filepair *p = q->queue[i];
3029
3030 if (((p->status == DIFF_STATUS_MODIFIED) &&
3031 ((p->score &&
3032 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3033 (!p->score &&
3034 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3035 ((p->status != DIFF_STATUS_MODIFIED) &&
3036 strchr(filter, p->status)))
3037 diff_q(&outq, p);
3038 else
3039 diff_free_filepair(p);
3040 }
3041 }
3042 free(q->queue);
3043 *q = outq;
3044 }
3045
3046 /* Check whether two filespecs with the same mode and size are identical */
3047 static int diff_filespec_is_identical(struct diff_filespec *one,
3048 struct diff_filespec *two)
3049 {
3050 if (S_ISGITLINK(one->mode)) {
3051 diff_fill_sha1_info(one);
3052 diff_fill_sha1_info(two);
3053 return !hashcmp(one->sha1, two->sha1);
3054 }
3055 if (diff_populate_filespec(one, 0))
3056 return 0;
3057 if (diff_populate_filespec(two, 0))
3058 return 0;
3059 return !memcmp(one->data, two->data, one->size);
3060 }
3061
3062 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3063 {
3064 int i;
3065 struct diff_queue_struct *q = &diff_queued_diff;
3066 struct diff_queue_struct outq;
3067 outq.queue = NULL;
3068 outq.nr = outq.alloc = 0;
3069
3070 for (i = 0; i < q->nr; i++) {
3071 struct diff_filepair *p = q->queue[i];
3072
3073 /*
3074 * 1. Entries that come from stat info dirtyness
3075 * always have both sides (iow, not create/delete),
3076 * one side of the object name is unknown, with
3077 * the same mode and size. Keep the ones that
3078 * do not match these criteria. They have real
3079 * differences.
3080 *
3081 * 2. At this point, the file is known to be modified,
3082 * with the same mode and size, and the object
3083 * name of one side is unknown. Need to inspect
3084 * the identical contents.
3085 */
3086 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3087 !DIFF_FILE_VALID(p->two) ||
3088 (p->one->sha1_valid && p->two->sha1_valid) ||
3089 (p->one->mode != p->two->mode) ||
3090 diff_populate_filespec(p->one, 1) ||
3091 diff_populate_filespec(p->two, 1) ||
3092 (p->one->size != p->two->size) ||
3093 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3094 diff_q(&outq, p);
3095 else {
3096 /*
3097 * The caller can subtract 1 from skip_stat_unmatch
3098 * to determine how many paths were dirty only
3099 * due to stat info mismatch.
3100 */
3101 if (!diffopt->no_index)
3102 diffopt->skip_stat_unmatch++;
3103 diff_free_filepair(p);
3104 }
3105 }
3106 free(q->queue);
3107 *q = outq;
3108 }
3109
3110 void diffcore_std(struct diff_options *options)
3111 {
3112 if (options->quiet)
3113 return;
3114
3115 if (options->skip_stat_unmatch && !options->find_copies_harder)
3116 diffcore_skip_stat_unmatch(options);
3117 if (options->break_opt != -1)
3118 diffcore_break(options->break_opt);
3119 if (options->detect_rename)
3120 diffcore_rename(options);
3121 if (options->break_opt != -1)
3122 diffcore_merge_broken();
3123 if (options->pickaxe)
3124 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3125 if (options->orderfile)
3126 diffcore_order(options->orderfile);
3127 diff_resolve_rename_copy();
3128 diffcore_apply_filter(options->filter);
3129
3130 options->has_changes = !!diff_queued_diff.nr;
3131 }
3132
3133
3134 void diff_addremove(struct diff_options *options,
3135 int addremove, unsigned mode,
3136 const unsigned char *sha1,
3137 const char *base, const char *path)
3138 {
3139 char concatpath[PATH_MAX];
3140 struct diff_filespec *one, *two;
3141
3142 /* This may look odd, but it is a preparation for
3143 * feeding "there are unchanged files which should
3144 * not produce diffs, but when you are doing copy
3145 * detection you would need them, so here they are"
3146 * entries to the diff-core. They will be prefixed
3147 * with something like '=' or '*' (I haven't decided
3148 * which but should not make any difference).
3149 * Feeding the same new and old to diff_change()
3150 * also has the same effect.
3151 * Before the final output happens, they are pruned after
3152 * merged into rename/copy pairs as appropriate.
3153 */
3154 if (options->reverse_diff)
3155 addremove = (addremove == '+' ? '-' :
3156 addremove == '-' ? '+' : addremove);
3157
3158 if (!path) path = "";
3159 sprintf(concatpath, "%s%s", base, path);
3160 one = alloc_filespec(concatpath);
3161 two = alloc_filespec(concatpath);
3162
3163 if (addremove != '+')
3164 fill_filespec(one, sha1, mode);
3165 if (addremove != '-')
3166 fill_filespec(two, sha1, mode);
3167
3168 diff_queue(&diff_queued_diff, one, two);
3169 options->has_changes = 1;
3170 }
3171
3172 void diff_change(struct diff_options *options,
3173 unsigned old_mode, unsigned new_mode,
3174 const unsigned char *old_sha1,
3175 const unsigned char *new_sha1,
3176 const char *base, const char *path)
3177 {
3178 char concatpath[PATH_MAX];
3179 struct diff_filespec *one, *two;
3180
3181 if (options->reverse_diff) {
3182 unsigned tmp;
3183 const unsigned char *tmp_c;
3184 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3185 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3186 }
3187 if (!path) path = "";
3188 sprintf(concatpath, "%s%s", base, path);
3189 one = alloc_filespec(concatpath);
3190 two = alloc_filespec(concatpath);
3191 fill_filespec(one, old_sha1, old_mode);
3192 fill_filespec(two, new_sha1, new_mode);
3193
3194 diff_queue(&diff_queued_diff, one, two);
3195 options->has_changes = 1;
3196 }
3197
3198 void diff_unmerge(struct diff_options *options,
3199 const char *path,
3200 unsigned mode, const unsigned char *sha1)
3201 {
3202 struct diff_filespec *one, *two;
3203 one = alloc_filespec(path);
3204 two = alloc_filespec(path);
3205 fill_filespec(one, sha1, mode);
3206 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3207 }
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