b08d28a5780cf242a4de78e0f5c4007b7041f392
[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
14 #ifdef NO_FAST_WORKING_DIRECTORY
15 #define FAST_WORKING_DIRECTORY 0
16 #else
17 #define FAST_WORKING_DIRECTORY 1
18 #endif
19
20 static int diff_detect_rename_default;
21 static int diff_rename_limit_default = 100;
22 static int diff_use_color_default;
23 int diff_auto_refresh_index = 1;
24
25 static char diff_colors[][COLOR_MAXLEN] = {
26 "\033[m", /* reset */
27 "", /* PLAIN (normal) */
28 "\033[1m", /* METAINFO (bold) */
29 "\033[36m", /* FRAGINFO (cyan) */
30 "\033[31m", /* OLD (red) */
31 "\033[32m", /* NEW (green) */
32 "\033[33m", /* COMMIT (yellow) */
33 "\033[41m", /* WHITESPACE (red background) */
34 };
35
36 static int parse_diff_color_slot(const char *var, int ofs)
37 {
38 if (!strcasecmp(var+ofs, "plain"))
39 return DIFF_PLAIN;
40 if (!strcasecmp(var+ofs, "meta"))
41 return DIFF_METAINFO;
42 if (!strcasecmp(var+ofs, "frag"))
43 return DIFF_FRAGINFO;
44 if (!strcasecmp(var+ofs, "old"))
45 return DIFF_FILE_OLD;
46 if (!strcasecmp(var+ofs, "new"))
47 return DIFF_FILE_NEW;
48 if (!strcasecmp(var+ofs, "commit"))
49 return DIFF_COMMIT;
50 if (!strcasecmp(var+ofs, "whitespace"))
51 return DIFF_WHITESPACE;
52 die("bad config variable '%s'", var);
53 }
54
55 static struct ll_diff_driver {
56 const char *name;
57 struct ll_diff_driver *next;
58 char *cmd;
59 } *user_diff, **user_diff_tail;
60
61 static void read_config_if_needed(void)
62 {
63 if (!user_diff_tail) {
64 user_diff_tail = &user_diff;
65 git_config(git_diff_ui_config);
66 }
67 }
68
69 /*
70 * Currently there is only "diff.<drivername>.command" variable;
71 * because there are "diff.color.<slot>" variables, we are parsing
72 * this in a bit convoluted way to allow low level diff driver
73 * called "color".
74 */
75 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
76 {
77 const char *name;
78 int namelen;
79 struct ll_diff_driver *drv;
80
81 name = var + 5;
82 namelen = ep - name;
83 for (drv = user_diff; drv; drv = drv->next)
84 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
85 break;
86 if (!drv) {
87 drv = xcalloc(1, sizeof(struct ll_diff_driver));
88 drv->name = xmemdupz(name, namelen);
89 if (!user_diff_tail)
90 user_diff_tail = &user_diff;
91 *user_diff_tail = drv;
92 user_diff_tail = &(drv->next);
93 }
94
95 if (!value)
96 return error("%s: lacks value", var);
97 drv->cmd = strdup(value);
98 return 0;
99 }
100
101 /*
102 * 'diff.<what>.funcname' attribute can be specified in the configuration
103 * to define a customized regexp to find the beginning of a function to
104 * be used for hunk header lines of "diff -p" style output.
105 */
106 static struct funcname_pattern {
107 char *name;
108 char *pattern;
109 struct funcname_pattern *next;
110 } *funcname_pattern_list;
111
112 static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
113 {
114 const char *name;
115 int namelen;
116 struct funcname_pattern *pp;
117
118 name = var + 5; /* "diff." */
119 namelen = ep - name;
120
121 for (pp = funcname_pattern_list; pp; pp = pp->next)
122 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
123 break;
124 if (!pp) {
125 pp = xcalloc(1, sizeof(*pp));
126 pp->name = xmemdupz(name, namelen);
127 pp->next = funcname_pattern_list;
128 funcname_pattern_list = pp;
129 }
130 if (pp->pattern)
131 free(pp->pattern);
132 pp->pattern = xstrdup(value);
133 return 0;
134 }
135
136 /*
137 * These are to give UI layer defaults.
138 * The core-level commands such as git-diff-files should
139 * never be affected by the setting of diff.renames
140 * the user happens to have in the configuration file.
141 */
142 int git_diff_ui_config(const char *var, const char *value)
143 {
144 if (!strcmp(var, "diff.renamelimit")) {
145 diff_rename_limit_default = git_config_int(var, value);
146 return 0;
147 }
148 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
149 diff_use_color_default = git_config_colorbool(var, value);
150 return 0;
151 }
152 if (!strcmp(var, "diff.renames")) {
153 if (!value)
154 diff_detect_rename_default = DIFF_DETECT_RENAME;
155 else if (!strcasecmp(value, "copies") ||
156 !strcasecmp(value, "copy"))
157 diff_detect_rename_default = DIFF_DETECT_COPY;
158 else if (git_config_bool(var,value))
159 diff_detect_rename_default = DIFF_DETECT_RENAME;
160 return 0;
161 }
162 if (!strcmp(var, "diff.autorefreshindex")) {
163 diff_auto_refresh_index = git_config_bool(var, value);
164 return 0;
165 }
166 if (!prefixcmp(var, "diff.")) {
167 const char *ep = strrchr(var, '.');
168
169 if (ep != var + 4) {
170 if (!strcmp(ep, ".command"))
171 return parse_lldiff_command(var, ep, value);
172 if (!strcmp(ep, ".funcname"))
173 return parse_funcname_pattern(var, ep, value);
174 }
175 }
176 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
177 int slot = parse_diff_color_slot(var, 11);
178 color_parse(value, var, diff_colors[slot]);
179 return 0;
180 }
181
182 return git_default_config(var, value);
183 }
184
185 static char *quote_two(const char *one, const char *two)
186 {
187 int need_one = quote_c_style(one, NULL, NULL, 1);
188 int need_two = quote_c_style(two, NULL, NULL, 1);
189 struct strbuf res;
190
191 strbuf_init(&res, 0);
192 if (need_one + need_two) {
193 strbuf_addch(&res, '"');
194 quote_c_style(one, &res, NULL, 1);
195 quote_c_style(two, &res, NULL, 1);
196 strbuf_addch(&res, '"');
197 } else {
198 strbuf_addstr(&res, one);
199 strbuf_addstr(&res, two);
200 }
201 return strbuf_detach(&res, NULL);
202 }
203
204 static const char *external_diff(void)
205 {
206 static const char *external_diff_cmd = NULL;
207 static int done_preparing = 0;
208
209 if (done_preparing)
210 return external_diff_cmd;
211 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
212 done_preparing = 1;
213 return external_diff_cmd;
214 }
215
216 static struct diff_tempfile {
217 const char *name; /* filename external diff should read from */
218 char hex[41];
219 char mode[10];
220 char tmp_path[PATH_MAX];
221 } diff_temp[2];
222
223 static int count_lines(const char *data, int size)
224 {
225 int count, ch, completely_empty = 1, nl_just_seen = 0;
226 count = 0;
227 while (0 < size--) {
228 ch = *data++;
229 if (ch == '\n') {
230 count++;
231 nl_just_seen = 1;
232 completely_empty = 0;
233 }
234 else {
235 nl_just_seen = 0;
236 completely_empty = 0;
237 }
238 }
239 if (completely_empty)
240 return 0;
241 if (!nl_just_seen)
242 count++; /* no trailing newline */
243 return count;
244 }
245
246 static void print_line_count(int count)
247 {
248 switch (count) {
249 case 0:
250 printf("0,0");
251 break;
252 case 1:
253 printf("1");
254 break;
255 default:
256 printf("1,%d", count);
257 break;
258 }
259 }
260
261 static void copy_file(int prefix, const char *data, int size,
262 const char *set, const char *reset)
263 {
264 int ch, nl_just_seen = 1;
265 while (0 < size--) {
266 ch = *data++;
267 if (nl_just_seen) {
268 fputs(set, stdout);
269 putchar(prefix);
270 }
271 if (ch == '\n') {
272 nl_just_seen = 1;
273 fputs(reset, stdout);
274 } else
275 nl_just_seen = 0;
276 putchar(ch);
277 }
278 if (!nl_just_seen)
279 printf("%s\n\\ No newline at end of file\n", reset);
280 }
281
282 static void emit_rewrite_diff(const char *name_a,
283 const char *name_b,
284 struct diff_filespec *one,
285 struct diff_filespec *two,
286 int color_diff)
287 {
288 int lc_a, lc_b;
289 const char *name_a_tab, *name_b_tab;
290 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
291 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
292 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
293 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
294 const char *reset = diff_get_color(color_diff, DIFF_RESET);
295
296 name_a += (*name_a == '/');
297 name_b += (*name_b == '/');
298 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
299 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
300
301 diff_populate_filespec(one, 0);
302 diff_populate_filespec(two, 0);
303 lc_a = count_lines(one->data, one->size);
304 lc_b = count_lines(two->data, two->size);
305 printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
306 metainfo, name_a, name_a_tab, reset,
307 metainfo, name_b, name_b_tab, reset, fraginfo);
308 print_line_count(lc_a);
309 printf(" +");
310 print_line_count(lc_b);
311 printf(" @@%s\n", reset);
312 if (lc_a)
313 copy_file('-', one->data, one->size, old, reset);
314 if (lc_b)
315 copy_file('+', two->data, two->size, new, reset);
316 }
317
318 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
319 {
320 if (!DIFF_FILE_VALID(one)) {
321 mf->ptr = (char *)""; /* does not matter */
322 mf->size = 0;
323 return 0;
324 }
325 else if (diff_populate_filespec(one, 0))
326 return -1;
327 mf->ptr = one->data;
328 mf->size = one->size;
329 return 0;
330 }
331
332 struct diff_words_buffer {
333 mmfile_t text;
334 long alloc;
335 long current; /* output pointer */
336 int suppressed_newline;
337 };
338
339 static void diff_words_append(char *line, unsigned long len,
340 struct diff_words_buffer *buffer)
341 {
342 if (buffer->text.size + len > buffer->alloc) {
343 buffer->alloc = (buffer->text.size + len) * 3 / 2;
344 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
345 }
346 line++;
347 len--;
348 memcpy(buffer->text.ptr + buffer->text.size, line, len);
349 buffer->text.size += len;
350 }
351
352 struct diff_words_data {
353 struct xdiff_emit_state xm;
354 struct diff_words_buffer minus, plus;
355 };
356
357 static void print_word(struct diff_words_buffer *buffer, int len, int color,
358 int suppress_newline)
359 {
360 const char *ptr;
361 int eol = 0;
362
363 if (len == 0)
364 return;
365
366 ptr = buffer->text.ptr + buffer->current;
367 buffer->current += len;
368
369 if (ptr[len - 1] == '\n') {
370 eol = 1;
371 len--;
372 }
373
374 fputs(diff_get_color(1, color), stdout);
375 fwrite(ptr, len, 1, stdout);
376 fputs(diff_get_color(1, DIFF_RESET), stdout);
377
378 if (eol) {
379 if (suppress_newline)
380 buffer->suppressed_newline = 1;
381 else
382 putchar('\n');
383 }
384 }
385
386 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
387 {
388 struct diff_words_data *diff_words = priv;
389
390 if (diff_words->minus.suppressed_newline) {
391 if (line[0] != '+')
392 putchar('\n');
393 diff_words->minus.suppressed_newline = 0;
394 }
395
396 len--;
397 switch (line[0]) {
398 case '-':
399 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
400 break;
401 case '+':
402 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
403 break;
404 case ' ':
405 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
406 diff_words->minus.current += len;
407 break;
408 }
409 }
410
411 /* this executes the word diff on the accumulated buffers */
412 static void diff_words_show(struct diff_words_data *diff_words)
413 {
414 xpparam_t xpp;
415 xdemitconf_t xecfg;
416 xdemitcb_t ecb;
417 mmfile_t minus, plus;
418 int i;
419
420 memset(&xecfg, 0, sizeof(xecfg));
421 minus.size = diff_words->minus.text.size;
422 minus.ptr = xmalloc(minus.size);
423 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
424 for (i = 0; i < minus.size; i++)
425 if (isspace(minus.ptr[i]))
426 minus.ptr[i] = '\n';
427 diff_words->minus.current = 0;
428
429 plus.size = diff_words->plus.text.size;
430 plus.ptr = xmalloc(plus.size);
431 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
432 for (i = 0; i < plus.size; i++)
433 if (isspace(plus.ptr[i]))
434 plus.ptr[i] = '\n';
435 diff_words->plus.current = 0;
436
437 xpp.flags = XDF_NEED_MINIMAL;
438 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
439 ecb.outf = xdiff_outf;
440 ecb.priv = diff_words;
441 diff_words->xm.consume = fn_out_diff_words_aux;
442 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
443
444 free(minus.ptr);
445 free(plus.ptr);
446 diff_words->minus.text.size = diff_words->plus.text.size = 0;
447
448 if (diff_words->minus.suppressed_newline) {
449 putchar('\n');
450 diff_words->minus.suppressed_newline = 0;
451 }
452 }
453
454 struct emit_callback {
455 struct xdiff_emit_state xm;
456 int nparents, color_diff;
457 const char **label_path;
458 struct diff_words_data *diff_words;
459 int *found_changesp;
460 };
461
462 static void free_diff_words_data(struct emit_callback *ecbdata)
463 {
464 if (ecbdata->diff_words) {
465 /* flush buffers */
466 if (ecbdata->diff_words->minus.text.size ||
467 ecbdata->diff_words->plus.text.size)
468 diff_words_show(ecbdata->diff_words);
469
470 if (ecbdata->diff_words->minus.text.ptr)
471 free (ecbdata->diff_words->minus.text.ptr);
472 if (ecbdata->diff_words->plus.text.ptr)
473 free (ecbdata->diff_words->plus.text.ptr);
474 free(ecbdata->diff_words);
475 ecbdata->diff_words = NULL;
476 }
477 }
478
479 const char *diff_get_color(int diff_use_color, enum color_diff ix)
480 {
481 if (diff_use_color)
482 return diff_colors[ix];
483 return "";
484 }
485
486 static void emit_line(const char *set, const char *reset, const char *line, int len)
487 {
488 if (len > 0 && line[len-1] == '\n')
489 len--;
490 fputs(set, stdout);
491 fwrite(line, len, 1, stdout);
492 puts(reset);
493 }
494
495 static void emit_line_with_ws(int nparents,
496 const char *set, const char *reset, const char *ws,
497 const char *line, int len)
498 {
499 int col0 = nparents;
500 int last_tab_in_indent = -1;
501 int last_space_in_indent = -1;
502 int i;
503 int tail = len;
504 int need_highlight_leading_space = 0;
505 /* The line is a newly added line. Does it have funny leading
506 * whitespaces? In indent, SP should never precede a TAB.
507 */
508 for (i = col0; i < len; i++) {
509 if (line[i] == '\t') {
510 last_tab_in_indent = i;
511 if (0 <= last_space_in_indent)
512 need_highlight_leading_space = 1;
513 }
514 else if (line[i] == ' ')
515 last_space_in_indent = i;
516 else
517 break;
518 }
519 fputs(set, stdout);
520 fwrite(line, col0, 1, stdout);
521 fputs(reset, stdout);
522 if (((i == len) || line[i] == '\n') && i != col0) {
523 /* The whole line was indent */
524 emit_line(ws, reset, line + col0, len - col0);
525 return;
526 }
527 i = col0;
528 if (need_highlight_leading_space) {
529 while (i < last_tab_in_indent) {
530 if (line[i] == ' ') {
531 fputs(ws, stdout);
532 putchar(' ');
533 fputs(reset, stdout);
534 }
535 else
536 putchar(line[i]);
537 i++;
538 }
539 }
540 tail = len - 1;
541 if (line[tail] == '\n' && i < tail)
542 tail--;
543 while (i < tail) {
544 if (!isspace(line[tail]))
545 break;
546 tail--;
547 }
548 if ((i < tail && line[tail + 1] != '\n')) {
549 /* This has whitespace between tail+1..len */
550 fputs(set, stdout);
551 fwrite(line + i, tail - i + 1, 1, stdout);
552 fputs(reset, stdout);
553 emit_line(ws, reset, line + tail + 1, len - tail - 1);
554 }
555 else
556 emit_line(set, reset, line + i, len - i);
557 }
558
559 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
560 {
561 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
562 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
563
564 if (!*ws)
565 emit_line(set, reset, line, len);
566 else
567 emit_line_with_ws(ecbdata->nparents, set, reset, ws,
568 line, len);
569 }
570
571 static void fn_out_consume(void *priv, char *line, unsigned long len)
572 {
573 int i;
574 int color;
575 struct emit_callback *ecbdata = priv;
576 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
577 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
578
579 *(ecbdata->found_changesp) = 1;
580
581 if (ecbdata->label_path[0]) {
582 const char *name_a_tab, *name_b_tab;
583
584 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
585 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
586
587 printf("%s--- %s%s%s\n",
588 set, ecbdata->label_path[0], reset, name_a_tab);
589 printf("%s+++ %s%s%s\n",
590 set, ecbdata->label_path[1], reset, name_b_tab);
591 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
592 }
593
594 /* This is not really necessary for now because
595 * this codepath only deals with two-way diffs.
596 */
597 for (i = 0; i < len && line[i] == '@'; i++)
598 ;
599 if (2 <= i && i < len && line[i] == ' ') {
600 ecbdata->nparents = i - 1;
601 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
602 reset, line, len);
603 return;
604 }
605
606 if (len < ecbdata->nparents) {
607 set = reset;
608 emit_line(reset, reset, line, len);
609 return;
610 }
611
612 color = DIFF_PLAIN;
613 if (ecbdata->diff_words && ecbdata->nparents != 1)
614 /* fall back to normal diff */
615 free_diff_words_data(ecbdata);
616 if (ecbdata->diff_words) {
617 if (line[0] == '-') {
618 diff_words_append(line, len,
619 &ecbdata->diff_words->minus);
620 return;
621 } else if (line[0] == '+') {
622 diff_words_append(line, len,
623 &ecbdata->diff_words->plus);
624 return;
625 }
626 if (ecbdata->diff_words->minus.text.size ||
627 ecbdata->diff_words->plus.text.size)
628 diff_words_show(ecbdata->diff_words);
629 line++;
630 len--;
631 emit_line(set, reset, line, len);
632 return;
633 }
634 for (i = 0; i < ecbdata->nparents && len; i++) {
635 if (line[i] == '-')
636 color = DIFF_FILE_OLD;
637 else if (line[i] == '+')
638 color = DIFF_FILE_NEW;
639 }
640
641 if (color != DIFF_FILE_NEW) {
642 emit_line(diff_get_color(ecbdata->color_diff, color),
643 reset, line, len);
644 return;
645 }
646 emit_add_line(reset, ecbdata, line, len);
647 }
648
649 static char *pprint_rename(const char *a, const char *b)
650 {
651 const char *old = a;
652 const char *new = b;
653 struct strbuf name;
654 int pfx_length, sfx_length;
655 int len_a = strlen(a);
656 int len_b = strlen(b);
657 int a_midlen, b_midlen;
658 int qlen_a = quote_c_style(a, NULL, NULL, 0);
659 int qlen_b = quote_c_style(b, NULL, NULL, 0);
660
661 strbuf_init(&name, 0);
662 if (qlen_a || qlen_b) {
663 quote_c_style(a, &name, NULL, 0);
664 strbuf_addstr(&name, " => ");
665 quote_c_style(b, &name, NULL, 0);
666 return strbuf_detach(&name, NULL);
667 }
668
669 /* Find common prefix */
670 pfx_length = 0;
671 while (*old && *new && *old == *new) {
672 if (*old == '/')
673 pfx_length = old - a + 1;
674 old++;
675 new++;
676 }
677
678 /* Find common suffix */
679 old = a + len_a;
680 new = b + len_b;
681 sfx_length = 0;
682 while (a <= old && b <= new && *old == *new) {
683 if (*old == '/')
684 sfx_length = len_a - (old - a);
685 old--;
686 new--;
687 }
688
689 /*
690 * pfx{mid-a => mid-b}sfx
691 * {pfx-a => pfx-b}sfx
692 * pfx{sfx-a => sfx-b}
693 * name-a => name-b
694 */
695 a_midlen = len_a - pfx_length - sfx_length;
696 b_midlen = len_b - pfx_length - sfx_length;
697 if (a_midlen < 0)
698 a_midlen = 0;
699 if (b_midlen < 0)
700 b_midlen = 0;
701
702 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
703 if (pfx_length + sfx_length) {
704 strbuf_add(&name, a, pfx_length);
705 strbuf_addch(&name, '{');
706 }
707 strbuf_add(&name, a + pfx_length, a_midlen);
708 strbuf_addstr(&name, " => ");
709 strbuf_add(&name, b + pfx_length, b_midlen);
710 if (pfx_length + sfx_length) {
711 strbuf_addch(&name, '}');
712 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
713 }
714 return strbuf_detach(&name, NULL);
715 }
716
717 struct diffstat_t {
718 struct xdiff_emit_state xm;
719
720 int nr;
721 int alloc;
722 struct diffstat_file {
723 char *name;
724 unsigned is_unmerged:1;
725 unsigned is_binary:1;
726 unsigned is_renamed:1;
727 unsigned int added, deleted;
728 } **files;
729 };
730
731 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
732 const char *name_a,
733 const char *name_b)
734 {
735 struct diffstat_file *x;
736 x = xcalloc(sizeof (*x), 1);
737 if (diffstat->nr == diffstat->alloc) {
738 diffstat->alloc = alloc_nr(diffstat->alloc);
739 diffstat->files = xrealloc(diffstat->files,
740 diffstat->alloc * sizeof(x));
741 }
742 diffstat->files[diffstat->nr++] = x;
743 if (name_b) {
744 x->name = pprint_rename(name_a, name_b);
745 x->is_renamed = 1;
746 }
747 else
748 x->name = xstrdup(name_a);
749 return x;
750 }
751
752 static void diffstat_consume(void *priv, char *line, unsigned long len)
753 {
754 struct diffstat_t *diffstat = priv;
755 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
756
757 if (line[0] == '+')
758 x->added++;
759 else if (line[0] == '-')
760 x->deleted++;
761 }
762
763 const char mime_boundary_leader[] = "------------";
764
765 static int scale_linear(int it, int width, int max_change)
766 {
767 /*
768 * make sure that at least one '-' is printed if there were deletions,
769 * and likewise for '+'.
770 */
771 if (max_change < 2)
772 return it;
773 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
774 }
775
776 static void show_name(const char *prefix, const char *name, int len,
777 const char *reset, const char *set)
778 {
779 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
780 }
781
782 static void show_graph(char ch, int cnt, const char *set, const char *reset)
783 {
784 if (cnt <= 0)
785 return;
786 printf("%s", set);
787 while (cnt--)
788 putchar(ch);
789 printf("%s", reset);
790 }
791
792 static void show_stats(struct diffstat_t* data, struct diff_options *options)
793 {
794 int i, len, add, del, total, adds = 0, dels = 0;
795 int max_change = 0, max_len = 0;
796 int total_files = data->nr;
797 int width, name_width;
798 const char *reset, *set, *add_c, *del_c;
799
800 if (data->nr == 0)
801 return;
802
803 width = options->stat_width ? options->stat_width : 80;
804 name_width = options->stat_name_width ? options->stat_name_width : 50;
805
806 /* Sanity: give at least 5 columns to the graph,
807 * but leave at least 10 columns for the name.
808 */
809 if (width < name_width + 15) {
810 if (name_width <= 25)
811 width = name_width + 15;
812 else
813 name_width = width - 15;
814 }
815
816 /* Find the longest filename and max number of changes */
817 reset = diff_get_color_opt(options, DIFF_RESET);
818 set = diff_get_color_opt(options, DIFF_PLAIN);
819 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
820 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
821
822 for (i = 0; i < data->nr; i++) {
823 struct diffstat_file *file = data->files[i];
824 int change = file->added + file->deleted;
825
826 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
827 struct strbuf buf;
828 strbuf_init(&buf, 0);
829 if (quote_c_style(file->name, &buf, NULL, 0)) {
830 free(file->name);
831 file->name = strbuf_detach(&buf, NULL);
832 } else {
833 strbuf_release(&buf);
834 }
835 }
836
837 len = strlen(file->name);
838 if (max_len < len)
839 max_len = len;
840
841 if (file->is_binary || file->is_unmerged)
842 continue;
843 if (max_change < change)
844 max_change = change;
845 }
846
847 /* Compute the width of the graph part;
848 * 10 is for one blank at the beginning of the line plus
849 * " | count " between the name and the graph.
850 *
851 * From here on, name_width is the width of the name area,
852 * and width is the width of the graph area.
853 */
854 name_width = (name_width < max_len) ? name_width : max_len;
855 if (width < (name_width + 10) + max_change)
856 width = width - (name_width + 10);
857 else
858 width = max_change;
859
860 for (i = 0; i < data->nr; i++) {
861 const char *prefix = "";
862 char *name = data->files[i]->name;
863 int added = data->files[i]->added;
864 int deleted = data->files[i]->deleted;
865 int name_len;
866
867 /*
868 * "scale" the filename
869 */
870 len = name_width;
871 name_len = strlen(name);
872 if (name_width < name_len) {
873 char *slash;
874 prefix = "...";
875 len -= 3;
876 name += name_len - len;
877 slash = strchr(name, '/');
878 if (slash)
879 name = slash;
880 }
881
882 if (data->files[i]->is_binary) {
883 show_name(prefix, name, len, reset, set);
884 printf(" Bin ");
885 printf("%s%d%s", del_c, deleted, reset);
886 printf(" -> ");
887 printf("%s%d%s", add_c, added, reset);
888 printf(" bytes");
889 printf("\n");
890 goto free_diffstat_file;
891 }
892 else if (data->files[i]->is_unmerged) {
893 show_name(prefix, name, len, reset, set);
894 printf(" Unmerged\n");
895 goto free_diffstat_file;
896 }
897 else if (!data->files[i]->is_renamed &&
898 (added + deleted == 0)) {
899 total_files--;
900 goto free_diffstat_file;
901 }
902
903 /*
904 * scale the add/delete
905 */
906 add = added;
907 del = deleted;
908 total = add + del;
909 adds += add;
910 dels += del;
911
912 if (width <= max_change) {
913 add = scale_linear(add, width, max_change);
914 del = scale_linear(del, width, max_change);
915 total = add + del;
916 }
917 show_name(prefix, name, len, reset, set);
918 printf("%5d ", added + deleted);
919 show_graph('+', add, add_c, reset);
920 show_graph('-', del, del_c, reset);
921 putchar('\n');
922 free_diffstat_file:
923 free(data->files[i]->name);
924 free(data->files[i]);
925 }
926 free(data->files);
927 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
928 set, total_files, adds, dels, reset);
929 }
930
931 static void show_shortstats(struct diffstat_t* data)
932 {
933 int i, adds = 0, dels = 0, total_files = data->nr;
934
935 if (data->nr == 0)
936 return;
937
938 for (i = 0; i < data->nr; i++) {
939 if (!data->files[i]->is_binary &&
940 !data->files[i]->is_unmerged) {
941 int added = data->files[i]->added;
942 int deleted= data->files[i]->deleted;
943 if (!data->files[i]->is_renamed &&
944 (added + deleted == 0)) {
945 total_files--;
946 } else {
947 adds += added;
948 dels += deleted;
949 }
950 }
951 free(data->files[i]->name);
952 free(data->files[i]);
953 }
954 free(data->files);
955
956 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
957 total_files, adds, dels);
958 }
959
960 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
961 {
962 int i;
963
964 for (i = 0; i < data->nr; i++) {
965 struct diffstat_file *file = data->files[i];
966
967 if (file->is_binary)
968 printf("-\t-\t");
969 else
970 printf("%d\t%d\t", file->added, file->deleted);
971 if (!file->is_renamed) {
972 write_name_quoted(file->name, stdout, options->line_termination);
973 } else {
974 fputs(file->name, stdout);
975 putchar(options->line_termination);
976 }
977 }
978 }
979
980 struct checkdiff_t {
981 struct xdiff_emit_state xm;
982 const char *filename;
983 int lineno, color_diff;
984 };
985
986 static void checkdiff_consume(void *priv, char *line, unsigned long len)
987 {
988 struct checkdiff_t *data = priv;
989 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
990 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
991 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
992
993 if (line[0] == '+') {
994 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
995
996 /* check space before tab */
997 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
998 if (line[i] == ' ')
999 spaces++;
1000 if (line[i - 1] == '\t' && spaces)
1001 space_before_tab = 1;
1002
1003 /* check white space at line end */
1004 if (line[len - 1] == '\n')
1005 len--;
1006 if (isspace(line[len - 1]))
1007 white_space_at_end = 1;
1008
1009 if (space_before_tab || white_space_at_end) {
1010 printf("%s:%d: %s", data->filename, data->lineno, ws);
1011 if (space_before_tab) {
1012 printf("space before tab");
1013 if (white_space_at_end)
1014 putchar(',');
1015 }
1016 if (white_space_at_end)
1017 printf("white space at end");
1018 printf(":%s ", reset);
1019 emit_line_with_ws(1, set, reset, ws, line, len);
1020 }
1021
1022 data->lineno++;
1023 } else if (line[0] == ' ')
1024 data->lineno++;
1025 else if (line[0] == '@') {
1026 char *plus = strchr(line, '+');
1027 if (plus)
1028 data->lineno = strtol(plus, NULL, 10);
1029 else
1030 die("invalid diff");
1031 }
1032 }
1033
1034 static unsigned char *deflate_it(char *data,
1035 unsigned long size,
1036 unsigned long *result_size)
1037 {
1038 int bound;
1039 unsigned char *deflated;
1040 z_stream stream;
1041
1042 memset(&stream, 0, sizeof(stream));
1043 deflateInit(&stream, zlib_compression_level);
1044 bound = deflateBound(&stream, size);
1045 deflated = xmalloc(bound);
1046 stream.next_out = deflated;
1047 stream.avail_out = bound;
1048
1049 stream.next_in = (unsigned char *)data;
1050 stream.avail_in = size;
1051 while (deflate(&stream, Z_FINISH) == Z_OK)
1052 ; /* nothing */
1053 deflateEnd(&stream);
1054 *result_size = stream.total_out;
1055 return deflated;
1056 }
1057
1058 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1059 {
1060 void *cp;
1061 void *delta;
1062 void *deflated;
1063 void *data;
1064 unsigned long orig_size;
1065 unsigned long delta_size;
1066 unsigned long deflate_size;
1067 unsigned long data_size;
1068
1069 /* We could do deflated delta, or we could do just deflated two,
1070 * whichever is smaller.
1071 */
1072 delta = NULL;
1073 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1074 if (one->size && two->size) {
1075 delta = diff_delta(one->ptr, one->size,
1076 two->ptr, two->size,
1077 &delta_size, deflate_size);
1078 if (delta) {
1079 void *to_free = delta;
1080 orig_size = delta_size;
1081 delta = deflate_it(delta, delta_size, &delta_size);
1082 free(to_free);
1083 }
1084 }
1085
1086 if (delta && delta_size < deflate_size) {
1087 printf("delta %lu\n", orig_size);
1088 free(deflated);
1089 data = delta;
1090 data_size = delta_size;
1091 }
1092 else {
1093 printf("literal %lu\n", two->size);
1094 free(delta);
1095 data = deflated;
1096 data_size = deflate_size;
1097 }
1098
1099 /* emit data encoded in base85 */
1100 cp = data;
1101 while (data_size) {
1102 int bytes = (52 < data_size) ? 52 : data_size;
1103 char line[70];
1104 data_size -= bytes;
1105 if (bytes <= 26)
1106 line[0] = bytes + 'A' - 1;
1107 else
1108 line[0] = bytes - 26 + 'a' - 1;
1109 encode_85(line + 1, cp, bytes);
1110 cp = (char *) cp + bytes;
1111 puts(line);
1112 }
1113 printf("\n");
1114 free(data);
1115 }
1116
1117 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1118 {
1119 printf("GIT binary patch\n");
1120 emit_binary_diff_body(one, two);
1121 emit_binary_diff_body(two, one);
1122 }
1123
1124 static void setup_diff_attr_check(struct git_attr_check *check)
1125 {
1126 static struct git_attr *attr_diff;
1127
1128 if (!attr_diff) {
1129 attr_diff = git_attr("diff", 4);
1130 }
1131 check[0].attr = attr_diff;
1132 }
1133
1134 static void diff_filespec_check_attr(struct diff_filespec *one)
1135 {
1136 struct git_attr_check attr_diff_check;
1137 int check_from_data = 0;
1138
1139 if (one->checked_attr)
1140 return;
1141
1142 setup_diff_attr_check(&attr_diff_check);
1143 one->is_binary = 0;
1144 one->funcname_pattern_ident = NULL;
1145
1146 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1147 const char *value;
1148
1149 /* binaryness */
1150 value = attr_diff_check.value;
1151 if (ATTR_TRUE(value))
1152 ;
1153 else if (ATTR_FALSE(value))
1154 one->is_binary = 1;
1155 else
1156 check_from_data = 1;
1157
1158 /* funcname pattern ident */
1159 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1160 ;
1161 else
1162 one->funcname_pattern_ident = value;
1163 }
1164
1165 if (check_from_data) {
1166 if (!one->data && DIFF_FILE_VALID(one))
1167 diff_populate_filespec(one, 0);
1168
1169 if (one->data)
1170 one->is_binary = buffer_is_binary(one->data, one->size);
1171 }
1172 }
1173
1174 int diff_filespec_is_binary(struct diff_filespec *one)
1175 {
1176 diff_filespec_check_attr(one);
1177 return one->is_binary;
1178 }
1179
1180 static const char *funcname_pattern(const char *ident)
1181 {
1182 struct funcname_pattern *pp;
1183
1184 read_config_if_needed();
1185 for (pp = funcname_pattern_list; pp; pp = pp->next)
1186 if (!strcmp(ident, pp->name))
1187 return pp->pattern;
1188 return NULL;
1189 }
1190
1191 static struct builtin_funcname_pattern {
1192 const char *name;
1193 const char *pattern;
1194 } builtin_funcname_pattern[] = {
1195 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1196 "new\\|return\\|switch\\|throw\\|while\\)\n"
1197 "^[ ]*\\(\\([ ]*"
1198 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1199 "[ ]*([^;]*$\\)" },
1200 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1201 };
1202
1203 static const char *diff_funcname_pattern(struct diff_filespec *one)
1204 {
1205 const char *ident, *pattern;
1206 int i;
1207
1208 diff_filespec_check_attr(one);
1209 ident = one->funcname_pattern_ident;
1210
1211 if (!ident)
1212 /*
1213 * If the config file has "funcname.default" defined, that
1214 * regexp is used; otherwise NULL is returned and xemit uses
1215 * the built-in default.
1216 */
1217 return funcname_pattern("default");
1218
1219 /* Look up custom "funcname.$ident" regexp from config. */
1220 pattern = funcname_pattern(ident);
1221 if (pattern)
1222 return pattern;
1223
1224 /*
1225 * And define built-in fallback patterns here. Note that
1226 * these can be overriden by the user's config settings.
1227 */
1228 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1229 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1230 return builtin_funcname_pattern[i].pattern;
1231
1232 return NULL;
1233 }
1234
1235 static void builtin_diff(const char *name_a,
1236 const char *name_b,
1237 struct diff_filespec *one,
1238 struct diff_filespec *two,
1239 const char *xfrm_msg,
1240 struct diff_options *o,
1241 int complete_rewrite)
1242 {
1243 mmfile_t mf1, mf2;
1244 const char *lbl[2];
1245 char *a_one, *b_two;
1246 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1247 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1248
1249 a_one = quote_two("a/", name_a + (*name_a == '/'));
1250 b_two = quote_two("b/", name_b + (*name_b == '/'));
1251 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1252 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1253 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1254 if (lbl[0][0] == '/') {
1255 /* /dev/null */
1256 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1257 if (xfrm_msg && xfrm_msg[0])
1258 printf("%s%s%s\n", set, xfrm_msg, reset);
1259 }
1260 else if (lbl[1][0] == '/') {
1261 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1262 if (xfrm_msg && xfrm_msg[0])
1263 printf("%s%s%s\n", set, xfrm_msg, reset);
1264 }
1265 else {
1266 if (one->mode != two->mode) {
1267 printf("%sold mode %06o%s\n", set, one->mode, reset);
1268 printf("%snew mode %06o%s\n", set, two->mode, reset);
1269 }
1270 if (xfrm_msg && xfrm_msg[0])
1271 printf("%s%s%s\n", set, xfrm_msg, reset);
1272 /*
1273 * we do not run diff between different kind
1274 * of objects.
1275 */
1276 if ((one->mode ^ two->mode) & S_IFMT)
1277 goto free_ab_and_return;
1278 if (complete_rewrite) {
1279 emit_rewrite_diff(name_a, name_b, one, two,
1280 DIFF_OPT_TST(o, COLOR_DIFF));
1281 o->found_changes = 1;
1282 goto free_ab_and_return;
1283 }
1284 }
1285
1286 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1287 die("unable to read files to diff");
1288
1289 if (!DIFF_OPT_TST(o, TEXT) &&
1290 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1291 /* Quite common confusing case */
1292 if (mf1.size == mf2.size &&
1293 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1294 goto free_ab_and_return;
1295 if (DIFF_OPT_TST(o, BINARY))
1296 emit_binary_diff(&mf1, &mf2);
1297 else
1298 printf("Binary files %s and %s differ\n",
1299 lbl[0], lbl[1]);
1300 o->found_changes = 1;
1301 }
1302 else {
1303 /* Crazy xdl interfaces.. */
1304 const char *diffopts = getenv("GIT_DIFF_OPTS");
1305 xpparam_t xpp;
1306 xdemitconf_t xecfg;
1307 xdemitcb_t ecb;
1308 struct emit_callback ecbdata;
1309 const char *funcname_pattern;
1310
1311 funcname_pattern = diff_funcname_pattern(one);
1312 if (!funcname_pattern)
1313 funcname_pattern = diff_funcname_pattern(two);
1314
1315 memset(&xecfg, 0, sizeof(xecfg));
1316 memset(&ecbdata, 0, sizeof(ecbdata));
1317 ecbdata.label_path = lbl;
1318 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1319 ecbdata.found_changesp = &o->found_changes;
1320 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1321 xecfg.ctxlen = o->context;
1322 xecfg.flags = XDL_EMIT_FUNCNAMES;
1323 if (funcname_pattern)
1324 xdiff_set_find_func(&xecfg, funcname_pattern);
1325 if (!diffopts)
1326 ;
1327 else if (!prefixcmp(diffopts, "--unified="))
1328 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1329 else if (!prefixcmp(diffopts, "-u"))
1330 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1331 ecb.outf = xdiff_outf;
1332 ecb.priv = &ecbdata;
1333 ecbdata.xm.consume = fn_out_consume;
1334 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1335 ecbdata.diff_words =
1336 xcalloc(1, sizeof(struct diff_words_data));
1337 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1338 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1339 free_diff_words_data(&ecbdata);
1340 }
1341
1342 free_ab_and_return:
1343 diff_free_filespec_data(one);
1344 diff_free_filespec_data(two);
1345 free(a_one);
1346 free(b_two);
1347 return;
1348 }
1349
1350 static void builtin_diffstat(const char *name_a, const char *name_b,
1351 struct diff_filespec *one,
1352 struct diff_filespec *two,
1353 struct diffstat_t *diffstat,
1354 struct diff_options *o,
1355 int complete_rewrite)
1356 {
1357 mmfile_t mf1, mf2;
1358 struct diffstat_file *data;
1359
1360 data = diffstat_add(diffstat, name_a, name_b);
1361
1362 if (!one || !two) {
1363 data->is_unmerged = 1;
1364 return;
1365 }
1366 if (complete_rewrite) {
1367 diff_populate_filespec(one, 0);
1368 diff_populate_filespec(two, 0);
1369 data->deleted = count_lines(one->data, one->size);
1370 data->added = count_lines(two->data, two->size);
1371 goto free_and_return;
1372 }
1373 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1374 die("unable to read files to diff");
1375
1376 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1377 data->is_binary = 1;
1378 data->added = mf2.size;
1379 data->deleted = mf1.size;
1380 } else {
1381 /* Crazy xdl interfaces.. */
1382 xpparam_t xpp;
1383 xdemitconf_t xecfg;
1384 xdemitcb_t ecb;
1385
1386 memset(&xecfg, 0, sizeof(xecfg));
1387 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1388 ecb.outf = xdiff_outf;
1389 ecb.priv = diffstat;
1390 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1391 }
1392
1393 free_and_return:
1394 diff_free_filespec_data(one);
1395 diff_free_filespec_data(two);
1396 }
1397
1398 static void builtin_checkdiff(const char *name_a, const char *name_b,
1399 struct diff_filespec *one,
1400 struct diff_filespec *two, struct diff_options *o)
1401 {
1402 mmfile_t mf1, mf2;
1403 struct checkdiff_t data;
1404
1405 if (!two)
1406 return;
1407
1408 memset(&data, 0, sizeof(data));
1409 data.xm.consume = checkdiff_consume;
1410 data.filename = name_b ? name_b : name_a;
1411 data.lineno = 0;
1412 data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1413
1414 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1415 die("unable to read files to diff");
1416
1417 if (diff_filespec_is_binary(two))
1418 goto free_and_return;
1419 else {
1420 /* Crazy xdl interfaces.. */
1421 xpparam_t xpp;
1422 xdemitconf_t xecfg;
1423 xdemitcb_t ecb;
1424
1425 memset(&xecfg, 0, sizeof(xecfg));
1426 xpp.flags = XDF_NEED_MINIMAL;
1427 ecb.outf = xdiff_outf;
1428 ecb.priv = &data;
1429 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1430 }
1431 free_and_return:
1432 diff_free_filespec_data(one);
1433 diff_free_filespec_data(two);
1434 }
1435
1436 struct diff_filespec *alloc_filespec(const char *path)
1437 {
1438 int namelen = strlen(path);
1439 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1440
1441 memset(spec, 0, sizeof(*spec));
1442 spec->path = (char *)(spec + 1);
1443 memcpy(spec->path, path, namelen+1);
1444 spec->count = 1;
1445 return spec;
1446 }
1447
1448 void free_filespec(struct diff_filespec *spec)
1449 {
1450 if (!--spec->count) {
1451 diff_free_filespec_data(spec);
1452 free(spec);
1453 }
1454 }
1455
1456 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1457 unsigned short mode)
1458 {
1459 if (mode) {
1460 spec->mode = canon_mode(mode);
1461 hashcpy(spec->sha1, sha1);
1462 spec->sha1_valid = !is_null_sha1(sha1);
1463 }
1464 }
1465
1466 /*
1467 * Given a name and sha1 pair, if the index tells us the file in
1468 * the work tree has that object contents, return true, so that
1469 * prepare_temp_file() does not have to inflate and extract.
1470 */
1471 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1472 {
1473 struct cache_entry *ce;
1474 struct stat st;
1475 int pos, len;
1476
1477 /* We do not read the cache ourselves here, because the
1478 * benchmark with my previous version that always reads cache
1479 * shows that it makes things worse for diff-tree comparing
1480 * two linux-2.6 kernel trees in an already checked out work
1481 * tree. This is because most diff-tree comparisons deal with
1482 * only a small number of files, while reading the cache is
1483 * expensive for a large project, and its cost outweighs the
1484 * savings we get by not inflating the object to a temporary
1485 * file. Practically, this code only helps when we are used
1486 * by diff-cache --cached, which does read the cache before
1487 * calling us.
1488 */
1489 if (!active_cache)
1490 return 0;
1491
1492 /* We want to avoid the working directory if our caller
1493 * doesn't need the data in a normal file, this system
1494 * is rather slow with its stat/open/mmap/close syscalls,
1495 * and the object is contained in a pack file. The pack
1496 * is probably already open and will be faster to obtain
1497 * the data through than the working directory. Loose
1498 * objects however would tend to be slower as they need
1499 * to be individually opened and inflated.
1500 */
1501 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1502 return 0;
1503
1504 len = strlen(name);
1505 pos = cache_name_pos(name, len);
1506 if (pos < 0)
1507 return 0;
1508 ce = active_cache[pos];
1509 if ((lstat(name, &st) < 0) ||
1510 !S_ISREG(st.st_mode) || /* careful! */
1511 ce_match_stat(ce, &st, 0) ||
1512 hashcmp(sha1, ce->sha1))
1513 return 0;
1514 /* we return 1 only when we can stat, it is a regular file,
1515 * stat information matches, and sha1 recorded in the cache
1516 * matches. I.e. we know the file in the work tree really is
1517 * the same as the <name, sha1> pair.
1518 */
1519 return 1;
1520 }
1521
1522 static int populate_from_stdin(struct diff_filespec *s)
1523 {
1524 struct strbuf buf;
1525 size_t size = 0;
1526
1527 strbuf_init(&buf, 0);
1528 if (strbuf_read(&buf, 0, 0) < 0)
1529 return error("error while reading from stdin %s",
1530 strerror(errno));
1531
1532 s->should_munmap = 0;
1533 s->data = strbuf_detach(&buf, &size);
1534 s->size = size;
1535 s->should_free = 1;
1536 return 0;
1537 }
1538
1539 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1540 {
1541 int len;
1542 char *data = xmalloc(100);
1543 len = snprintf(data, 100,
1544 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1545 s->data = data;
1546 s->size = len;
1547 s->should_free = 1;
1548 if (size_only) {
1549 s->data = NULL;
1550 free(data);
1551 }
1552 return 0;
1553 }
1554
1555 /*
1556 * While doing rename detection and pickaxe operation, we may need to
1557 * grab the data for the blob (or file) for our own in-core comparison.
1558 * diff_filespec has data and size fields for this purpose.
1559 */
1560 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1561 {
1562 int err = 0;
1563 if (!DIFF_FILE_VALID(s))
1564 die("internal error: asking to populate invalid file.");
1565 if (S_ISDIR(s->mode))
1566 return -1;
1567
1568 if (s->data)
1569 return 0;
1570
1571 if (size_only && 0 < s->size)
1572 return 0;
1573
1574 if (S_ISGITLINK(s->mode))
1575 return diff_populate_gitlink(s, size_only);
1576
1577 if (!s->sha1_valid ||
1578 reuse_worktree_file(s->path, s->sha1, 0)) {
1579 struct strbuf buf;
1580 struct stat st;
1581 int fd;
1582
1583 if (!strcmp(s->path, "-"))
1584 return populate_from_stdin(s);
1585
1586 if (lstat(s->path, &st) < 0) {
1587 if (errno == ENOENT) {
1588 err_empty:
1589 err = -1;
1590 empty:
1591 s->data = (char *)"";
1592 s->size = 0;
1593 return err;
1594 }
1595 }
1596 s->size = xsize_t(st.st_size);
1597 if (!s->size)
1598 goto empty;
1599 if (size_only)
1600 return 0;
1601 if (S_ISLNK(st.st_mode)) {
1602 int ret;
1603 s->data = xmalloc(s->size);
1604 s->should_free = 1;
1605 ret = readlink(s->path, s->data, s->size);
1606 if (ret < 0) {
1607 free(s->data);
1608 goto err_empty;
1609 }
1610 return 0;
1611 }
1612 fd = open(s->path, O_RDONLY);
1613 if (fd < 0)
1614 goto err_empty;
1615 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1616 close(fd);
1617 s->should_munmap = 1;
1618
1619 /*
1620 * Convert from working tree format to canonical git format
1621 */
1622 strbuf_init(&buf, 0);
1623 if (convert_to_git(s->path, s->data, s->size, &buf)) {
1624 size_t size = 0;
1625 munmap(s->data, s->size);
1626 s->should_munmap = 0;
1627 s->data = strbuf_detach(&buf, &size);
1628 s->size = size;
1629 s->should_free = 1;
1630 }
1631 }
1632 else {
1633 enum object_type type;
1634 if (size_only)
1635 type = sha1_object_info(s->sha1, &s->size);
1636 else {
1637 s->data = read_sha1_file(s->sha1, &type, &s->size);
1638 s->should_free = 1;
1639 }
1640 }
1641 return 0;
1642 }
1643
1644 void diff_free_filespec_blob(struct diff_filespec *s)
1645 {
1646 if (s->should_free)
1647 free(s->data);
1648 else if (s->should_munmap)
1649 munmap(s->data, s->size);
1650
1651 if (s->should_free || s->should_munmap) {
1652 s->should_free = s->should_munmap = 0;
1653 s->data = NULL;
1654 }
1655 }
1656
1657 void diff_free_filespec_data(struct diff_filespec *s)
1658 {
1659 diff_free_filespec_blob(s);
1660 free(s->cnt_data);
1661 s->cnt_data = NULL;
1662 }
1663
1664 static void prep_temp_blob(struct diff_tempfile *temp,
1665 void *blob,
1666 unsigned long size,
1667 const unsigned char *sha1,
1668 int mode)
1669 {
1670 int fd;
1671
1672 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1673 if (fd < 0)
1674 die("unable to create temp-file: %s", strerror(errno));
1675 if (write_in_full(fd, blob, size) != size)
1676 die("unable to write temp-file");
1677 close(fd);
1678 temp->name = temp->tmp_path;
1679 strcpy(temp->hex, sha1_to_hex(sha1));
1680 temp->hex[40] = 0;
1681 sprintf(temp->mode, "%06o", mode);
1682 }
1683
1684 static void prepare_temp_file(const char *name,
1685 struct diff_tempfile *temp,
1686 struct diff_filespec *one)
1687 {
1688 if (!DIFF_FILE_VALID(one)) {
1689 not_a_valid_file:
1690 /* A '-' entry produces this for file-2, and
1691 * a '+' entry produces this for file-1.
1692 */
1693 temp->name = "/dev/null";
1694 strcpy(temp->hex, ".");
1695 strcpy(temp->mode, ".");
1696 return;
1697 }
1698
1699 if (!one->sha1_valid ||
1700 reuse_worktree_file(name, one->sha1, 1)) {
1701 struct stat st;
1702 if (lstat(name, &st) < 0) {
1703 if (errno == ENOENT)
1704 goto not_a_valid_file;
1705 die("stat(%s): %s", name, strerror(errno));
1706 }
1707 if (S_ISLNK(st.st_mode)) {
1708 int ret;
1709 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1710 size_t sz = xsize_t(st.st_size);
1711 if (sizeof(buf) <= st.st_size)
1712 die("symlink too long: %s", name);
1713 ret = readlink(name, buf, sz);
1714 if (ret < 0)
1715 die("readlink(%s)", name);
1716 prep_temp_blob(temp, buf, sz,
1717 (one->sha1_valid ?
1718 one->sha1 : null_sha1),
1719 (one->sha1_valid ?
1720 one->mode : S_IFLNK));
1721 }
1722 else {
1723 /* we can borrow from the file in the work tree */
1724 temp->name = name;
1725 if (!one->sha1_valid)
1726 strcpy(temp->hex, sha1_to_hex(null_sha1));
1727 else
1728 strcpy(temp->hex, sha1_to_hex(one->sha1));
1729 /* Even though we may sometimes borrow the
1730 * contents from the work tree, we always want
1731 * one->mode. mode is trustworthy even when
1732 * !(one->sha1_valid), as long as
1733 * DIFF_FILE_VALID(one).
1734 */
1735 sprintf(temp->mode, "%06o", one->mode);
1736 }
1737 return;
1738 }
1739 else {
1740 if (diff_populate_filespec(one, 0))
1741 die("cannot read data blob for %s", one->path);
1742 prep_temp_blob(temp, one->data, one->size,
1743 one->sha1, one->mode);
1744 }
1745 }
1746
1747 static void remove_tempfile(void)
1748 {
1749 int i;
1750
1751 for (i = 0; i < 2; i++)
1752 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1753 unlink(diff_temp[i].name);
1754 diff_temp[i].name = NULL;
1755 }
1756 }
1757
1758 static void remove_tempfile_on_signal(int signo)
1759 {
1760 remove_tempfile();
1761 signal(SIGINT, SIG_DFL);
1762 raise(signo);
1763 }
1764
1765 /* An external diff command takes:
1766 *
1767 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1768 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1769 *
1770 */
1771 static void run_external_diff(const char *pgm,
1772 const char *name,
1773 const char *other,
1774 struct diff_filespec *one,
1775 struct diff_filespec *two,
1776 const char *xfrm_msg,
1777 int complete_rewrite)
1778 {
1779 const char *spawn_arg[10];
1780 struct diff_tempfile *temp = diff_temp;
1781 int retval;
1782 static int atexit_asked = 0;
1783 const char *othername;
1784 const char **arg = &spawn_arg[0];
1785
1786 othername = (other? other : name);
1787 if (one && two) {
1788 prepare_temp_file(name, &temp[0], one);
1789 prepare_temp_file(othername, &temp[1], two);
1790 if (! atexit_asked &&
1791 (temp[0].name == temp[0].tmp_path ||
1792 temp[1].name == temp[1].tmp_path)) {
1793 atexit_asked = 1;
1794 atexit(remove_tempfile);
1795 }
1796 signal(SIGINT, remove_tempfile_on_signal);
1797 }
1798
1799 if (one && two) {
1800 *arg++ = pgm;
1801 *arg++ = name;
1802 *arg++ = temp[0].name;
1803 *arg++ = temp[0].hex;
1804 *arg++ = temp[0].mode;
1805 *arg++ = temp[1].name;
1806 *arg++ = temp[1].hex;
1807 *arg++ = temp[1].mode;
1808 if (other) {
1809 *arg++ = other;
1810 *arg++ = xfrm_msg;
1811 }
1812 } else {
1813 *arg++ = pgm;
1814 *arg++ = name;
1815 }
1816 *arg = NULL;
1817 fflush(NULL);
1818 retval = run_command_v_opt(spawn_arg, 0);
1819 remove_tempfile();
1820 if (retval) {
1821 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1822 exit(1);
1823 }
1824 }
1825
1826 static const char *external_diff_attr(const char *name)
1827 {
1828 struct git_attr_check attr_diff_check;
1829
1830 setup_diff_attr_check(&attr_diff_check);
1831 if (!git_checkattr(name, 1, &attr_diff_check)) {
1832 const char *value = attr_diff_check.value;
1833 if (!ATTR_TRUE(value) &&
1834 !ATTR_FALSE(value) &&
1835 !ATTR_UNSET(value)) {
1836 struct ll_diff_driver *drv;
1837
1838 read_config_if_needed();
1839 for (drv = user_diff; drv; drv = drv->next)
1840 if (!strcmp(drv->name, value))
1841 return drv->cmd;
1842 }
1843 }
1844 return NULL;
1845 }
1846
1847 static void run_diff_cmd(const char *pgm,
1848 const char *name,
1849 const char *other,
1850 struct diff_filespec *one,
1851 struct diff_filespec *two,
1852 const char *xfrm_msg,
1853 struct diff_options *o,
1854 int complete_rewrite)
1855 {
1856 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
1857 pgm = NULL;
1858 else {
1859 const char *cmd = external_diff_attr(name);
1860 if (cmd)
1861 pgm = cmd;
1862 }
1863
1864 if (pgm) {
1865 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1866 complete_rewrite);
1867 return;
1868 }
1869 if (one && two)
1870 builtin_diff(name, other ? other : name,
1871 one, two, xfrm_msg, o, complete_rewrite);
1872 else
1873 printf("* Unmerged path %s\n", name);
1874 }
1875
1876 static void diff_fill_sha1_info(struct diff_filespec *one)
1877 {
1878 if (DIFF_FILE_VALID(one)) {
1879 if (!one->sha1_valid) {
1880 struct stat st;
1881 if (!strcmp(one->path, "-")) {
1882 hashcpy(one->sha1, null_sha1);
1883 return;
1884 }
1885 if (lstat(one->path, &st) < 0)
1886 die("stat %s", one->path);
1887 if (index_path(one->sha1, one->path, &st, 0))
1888 die("cannot hash %s\n", one->path);
1889 }
1890 }
1891 else
1892 hashclr(one->sha1);
1893 }
1894
1895 static int similarity_index(struct diff_filepair *p)
1896 {
1897 return p->score * 100 / MAX_SCORE;
1898 }
1899
1900 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1901 {
1902 const char *pgm = external_diff();
1903 struct strbuf msg;
1904 char *xfrm_msg;
1905 struct diff_filespec *one = p->one;
1906 struct diff_filespec *two = p->two;
1907 const char *name;
1908 const char *other;
1909 int complete_rewrite = 0;
1910
1911
1912 if (DIFF_PAIR_UNMERGED(p)) {
1913 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1914 return;
1915 }
1916
1917 name = p->one->path;
1918 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1919 diff_fill_sha1_info(one);
1920 diff_fill_sha1_info(two);
1921
1922 strbuf_init(&msg, PATH_MAX * 2 + 300);
1923 switch (p->status) {
1924 case DIFF_STATUS_COPIED:
1925 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1926 strbuf_addstr(&msg, "\ncopy from ");
1927 quote_c_style(name, &msg, NULL, 0);
1928 strbuf_addstr(&msg, "\ncopy to ");
1929 quote_c_style(other, &msg, NULL, 0);
1930 strbuf_addch(&msg, '\n');
1931 break;
1932 case DIFF_STATUS_RENAMED:
1933 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1934 strbuf_addstr(&msg, "\nrename from ");
1935 quote_c_style(name, &msg, NULL, 0);
1936 strbuf_addstr(&msg, "\nrename to ");
1937 quote_c_style(other, &msg, NULL, 0);
1938 strbuf_addch(&msg, '\n');
1939 break;
1940 case DIFF_STATUS_MODIFIED:
1941 if (p->score) {
1942 strbuf_addf(&msg, "dissimilarity index %d%%\n",
1943 similarity_index(p));
1944 complete_rewrite = 1;
1945 break;
1946 }
1947 /* fallthru */
1948 default:
1949 /* nothing */
1950 ;
1951 }
1952
1953 if (hashcmp(one->sha1, two->sha1)) {
1954 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
1955
1956 if (DIFF_OPT_TST(o, BINARY)) {
1957 mmfile_t mf;
1958 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
1959 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
1960 abbrev = 40;
1961 }
1962 strbuf_addf(&msg, "index %.*s..%.*s",
1963 abbrev, sha1_to_hex(one->sha1),
1964 abbrev, sha1_to_hex(two->sha1));
1965 if (one->mode == two->mode)
1966 strbuf_addf(&msg, " %06o", one->mode);
1967 strbuf_addch(&msg, '\n');
1968 }
1969
1970 if (msg.len)
1971 strbuf_setlen(&msg, msg.len - 1);
1972 xfrm_msg = msg.len ? msg.buf : NULL;
1973
1974 if (!pgm &&
1975 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1976 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1977 /* a filepair that changes between file and symlink
1978 * needs to be split into deletion and creation.
1979 */
1980 struct diff_filespec *null = alloc_filespec(two->path);
1981 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1982 free(null);
1983 null = alloc_filespec(one->path);
1984 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1985 free(null);
1986 }
1987 else
1988 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1989 complete_rewrite);
1990
1991 strbuf_release(&msg);
1992 }
1993
1994 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1995 struct diffstat_t *diffstat)
1996 {
1997 const char *name;
1998 const char *other;
1999 int complete_rewrite = 0;
2000
2001 if (DIFF_PAIR_UNMERGED(p)) {
2002 /* unmerged */
2003 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2004 return;
2005 }
2006
2007 name = p->one->path;
2008 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2009
2010 diff_fill_sha1_info(p->one);
2011 diff_fill_sha1_info(p->two);
2012
2013 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2014 complete_rewrite = 1;
2015 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2016 }
2017
2018 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2019 {
2020 const char *name;
2021 const char *other;
2022
2023 if (DIFF_PAIR_UNMERGED(p)) {
2024 /* unmerged */
2025 return;
2026 }
2027
2028 name = p->one->path;
2029 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2030
2031 diff_fill_sha1_info(p->one);
2032 diff_fill_sha1_info(p->two);
2033
2034 builtin_checkdiff(name, other, p->one, p->two, o);
2035 }
2036
2037 void diff_setup(struct diff_options *options)
2038 {
2039 memset(options, 0, sizeof(*options));
2040 options->line_termination = '\n';
2041 options->break_opt = -1;
2042 options->rename_limit = -1;
2043 options->context = 3;
2044 options->msg_sep = "";
2045
2046 options->change = diff_change;
2047 options->add_remove = diff_addremove;
2048 if (diff_use_color_default)
2049 DIFF_OPT_SET(options, COLOR_DIFF);
2050 else
2051 DIFF_OPT_CLR(options, COLOR_DIFF);
2052 options->detect_rename = diff_detect_rename_default;
2053 }
2054
2055 int diff_setup_done(struct diff_options *options)
2056 {
2057 int count = 0;
2058
2059 if (options->output_format & DIFF_FORMAT_NAME)
2060 count++;
2061 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2062 count++;
2063 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2064 count++;
2065 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2066 count++;
2067 if (count > 1)
2068 die("--name-only, --name-status, --check and -s are mutually exclusive");
2069
2070 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2071 options->detect_rename = DIFF_DETECT_COPY;
2072
2073 if (options->output_format & (DIFF_FORMAT_NAME |
2074 DIFF_FORMAT_NAME_STATUS |
2075 DIFF_FORMAT_CHECKDIFF |
2076 DIFF_FORMAT_NO_OUTPUT))
2077 options->output_format &= ~(DIFF_FORMAT_RAW |
2078 DIFF_FORMAT_NUMSTAT |
2079 DIFF_FORMAT_DIFFSTAT |
2080 DIFF_FORMAT_SHORTSTAT |
2081 DIFF_FORMAT_SUMMARY |
2082 DIFF_FORMAT_PATCH);
2083
2084 /*
2085 * These cases always need recursive; we do not drop caller-supplied
2086 * recursive bits for other formats here.
2087 */
2088 if (options->output_format & (DIFF_FORMAT_PATCH |
2089 DIFF_FORMAT_NUMSTAT |
2090 DIFF_FORMAT_DIFFSTAT |
2091 DIFF_FORMAT_SHORTSTAT |
2092 DIFF_FORMAT_SUMMARY |
2093 DIFF_FORMAT_CHECKDIFF))
2094 DIFF_OPT_SET(options, RECURSIVE);
2095 /*
2096 * Also pickaxe would not work very well if you do not say recursive
2097 */
2098 if (options->pickaxe)
2099 DIFF_OPT_SET(options, RECURSIVE);
2100
2101 if (options->detect_rename && options->rename_limit < 0)
2102 options->rename_limit = diff_rename_limit_default;
2103 if (options->setup & DIFF_SETUP_USE_CACHE) {
2104 if (!active_cache)
2105 /* read-cache does not die even when it fails
2106 * so it is safe for us to do this here. Also
2107 * it does not smudge active_cache or active_nr
2108 * when it fails, so we do not have to worry about
2109 * cleaning it up ourselves either.
2110 */
2111 read_cache();
2112 }
2113 if (options->abbrev <= 0 || 40 < options->abbrev)
2114 options->abbrev = 40; /* full */
2115
2116 /*
2117 * It does not make sense to show the first hit we happened
2118 * to have found. It does not make sense not to return with
2119 * exit code in such a case either.
2120 */
2121 if (DIFF_OPT_TST(options, QUIET)) {
2122 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2123 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2124 }
2125
2126 /*
2127 * If we postprocess in diffcore, we cannot simply return
2128 * upon the first hit. We need to run diff as usual.
2129 */
2130 if (options->pickaxe || options->filter)
2131 DIFF_OPT_CLR(options, QUIET);
2132
2133 return 0;
2134 }
2135
2136 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2137 {
2138 char c, *eq;
2139 int len;
2140
2141 if (*arg != '-')
2142 return 0;
2143 c = *++arg;
2144 if (!c)
2145 return 0;
2146 if (c == arg_short) {
2147 c = *++arg;
2148 if (!c)
2149 return 1;
2150 if (val && isdigit(c)) {
2151 char *end;
2152 int n = strtoul(arg, &end, 10);
2153 if (*end)
2154 return 0;
2155 *val = n;
2156 return 1;
2157 }
2158 return 0;
2159 }
2160 if (c != '-')
2161 return 0;
2162 arg++;
2163 eq = strchr(arg, '=');
2164 if (eq)
2165 len = eq - arg;
2166 else
2167 len = strlen(arg);
2168 if (!len || strncmp(arg, arg_long, len))
2169 return 0;
2170 if (eq) {
2171 int n;
2172 char *end;
2173 if (!isdigit(*++eq))
2174 return 0;
2175 n = strtoul(eq, &end, 10);
2176 if (*end)
2177 return 0;
2178 *val = n;
2179 }
2180 return 1;
2181 }
2182
2183 static int diff_scoreopt_parse(const char *opt);
2184
2185 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2186 {
2187 const char *arg = av[0];
2188
2189 /* Output format options */
2190 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2191 options->output_format |= DIFF_FORMAT_PATCH;
2192 else if (opt_arg(arg, 'U', "unified", &options->context))
2193 options->output_format |= DIFF_FORMAT_PATCH;
2194 else if (!strcmp(arg, "--raw"))
2195 options->output_format |= DIFF_FORMAT_RAW;
2196 else if (!strcmp(arg, "--patch-with-raw"))
2197 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2198 else if (!strcmp(arg, "--numstat"))
2199 options->output_format |= DIFF_FORMAT_NUMSTAT;
2200 else if (!strcmp(arg, "--shortstat"))
2201 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2202 else if (!strcmp(arg, "--check"))
2203 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2204 else if (!strcmp(arg, "--summary"))
2205 options->output_format |= DIFF_FORMAT_SUMMARY;
2206 else if (!strcmp(arg, "--patch-with-stat"))
2207 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2208 else if (!strcmp(arg, "--name-only"))
2209 options->output_format |= DIFF_FORMAT_NAME;
2210 else if (!strcmp(arg, "--name-status"))
2211 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2212 else if (!strcmp(arg, "-s"))
2213 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2214 else if (!prefixcmp(arg, "--stat")) {
2215 char *end;
2216 int width = options->stat_width;
2217 int name_width = options->stat_name_width;
2218 arg += 6;
2219 end = (char *)arg;
2220
2221 switch (*arg) {
2222 case '-':
2223 if (!prefixcmp(arg, "-width="))
2224 width = strtoul(arg + 7, &end, 10);
2225 else if (!prefixcmp(arg, "-name-width="))
2226 name_width = strtoul(arg + 12, &end, 10);
2227 break;
2228 case '=':
2229 width = strtoul(arg+1, &end, 10);
2230 if (*end == ',')
2231 name_width = strtoul(end+1, &end, 10);
2232 }
2233
2234 /* Important! This checks all the error cases! */
2235 if (*end)
2236 return 0;
2237 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2238 options->stat_name_width = name_width;
2239 options->stat_width = width;
2240 }
2241
2242 /* renames options */
2243 else if (!prefixcmp(arg, "-B")) {
2244 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2245 return -1;
2246 }
2247 else if (!prefixcmp(arg, "-M")) {
2248 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2249 return -1;
2250 options->detect_rename = DIFF_DETECT_RENAME;
2251 }
2252 else if (!prefixcmp(arg, "-C")) {
2253 if (options->detect_rename == DIFF_DETECT_COPY)
2254 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2255 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2256 return -1;
2257 options->detect_rename = DIFF_DETECT_COPY;
2258 }
2259 else if (!strcmp(arg, "--no-renames"))
2260 options->detect_rename = 0;
2261
2262 /* xdiff options */
2263 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2264 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2265 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2266 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2267 else if (!strcmp(arg, "--ignore-space-at-eol"))
2268 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2269
2270 /* flags options */
2271 else if (!strcmp(arg, "--binary")) {
2272 options->output_format |= DIFF_FORMAT_PATCH;
2273 DIFF_OPT_SET(options, BINARY);
2274 }
2275 else if (!strcmp(arg, "--full-index"))
2276 DIFF_OPT_SET(options, FULL_INDEX);
2277 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2278 DIFF_OPT_SET(options, TEXT);
2279 else if (!strcmp(arg, "-R"))
2280 DIFF_OPT_SET(options, REVERSE_DIFF);
2281 else if (!strcmp(arg, "--find-copies-harder"))
2282 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2283 else if (!strcmp(arg, "--follow"))
2284 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2285 else if (!strcmp(arg, "--color"))
2286 DIFF_OPT_SET(options, COLOR_DIFF);
2287 else if (!strcmp(arg, "--no-color"))
2288 DIFF_OPT_CLR(options, COLOR_DIFF);
2289 else if (!strcmp(arg, "--color-words"))
2290 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2291 else if (!strcmp(arg, "--exit-code"))
2292 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2293 else if (!strcmp(arg, "--quiet"))
2294 DIFF_OPT_SET(options, QUIET);
2295 else if (!strcmp(arg, "--ext-diff"))
2296 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2297 else if (!strcmp(arg, "--no-ext-diff"))
2298 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2299
2300 /* misc options */
2301 else if (!strcmp(arg, "-z"))
2302 options->line_termination = 0;
2303 else if (!prefixcmp(arg, "-l"))
2304 options->rename_limit = strtoul(arg+2, NULL, 10);
2305 else if (!prefixcmp(arg, "-S"))
2306 options->pickaxe = arg + 2;
2307 else if (!strcmp(arg, "--pickaxe-all"))
2308 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2309 else if (!strcmp(arg, "--pickaxe-regex"))
2310 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2311 else if (!prefixcmp(arg, "-O"))
2312 options->orderfile = arg + 2;
2313 else if (!prefixcmp(arg, "--diff-filter="))
2314 options->filter = arg + 14;
2315 else if (!strcmp(arg, "--abbrev"))
2316 options->abbrev = DEFAULT_ABBREV;
2317 else if (!prefixcmp(arg, "--abbrev=")) {
2318 options->abbrev = strtoul(arg + 9, NULL, 10);
2319 if (options->abbrev < MINIMUM_ABBREV)
2320 options->abbrev = MINIMUM_ABBREV;
2321 else if (40 < options->abbrev)
2322 options->abbrev = 40;
2323 }
2324 else
2325 return 0;
2326 return 1;
2327 }
2328
2329 static int parse_num(const char **cp_p)
2330 {
2331 unsigned long num, scale;
2332 int ch, dot;
2333 const char *cp = *cp_p;
2334
2335 num = 0;
2336 scale = 1;
2337 dot = 0;
2338 for(;;) {
2339 ch = *cp;
2340 if ( !dot && ch == '.' ) {
2341 scale = 1;
2342 dot = 1;
2343 } else if ( ch == '%' ) {
2344 scale = dot ? scale*100 : 100;
2345 cp++; /* % is always at the end */
2346 break;
2347 } else if ( ch >= '0' && ch <= '9' ) {
2348 if ( scale < 100000 ) {
2349 scale *= 10;
2350 num = (num*10) + (ch-'0');
2351 }
2352 } else {
2353 break;
2354 }
2355 cp++;
2356 }
2357 *cp_p = cp;
2358
2359 /* user says num divided by scale and we say internally that
2360 * is MAX_SCORE * num / scale.
2361 */
2362 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2363 }
2364
2365 static int diff_scoreopt_parse(const char *opt)
2366 {
2367 int opt1, opt2, cmd;
2368
2369 if (*opt++ != '-')
2370 return -1;
2371 cmd = *opt++;
2372 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2373 return -1; /* that is not a -M, -C nor -B option */
2374
2375 opt1 = parse_num(&opt);
2376 if (cmd != 'B')
2377 opt2 = 0;
2378 else {
2379 if (*opt == 0)
2380 opt2 = 0;
2381 else if (*opt != '/')
2382 return -1; /* we expect -B80/99 or -B80 */
2383 else {
2384 opt++;
2385 opt2 = parse_num(&opt);
2386 }
2387 }
2388 if (*opt != 0)
2389 return -1;
2390 return opt1 | (opt2 << 16);
2391 }
2392
2393 struct diff_queue_struct diff_queued_diff;
2394
2395 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2396 {
2397 if (queue->alloc <= queue->nr) {
2398 queue->alloc = alloc_nr(queue->alloc);
2399 queue->queue = xrealloc(queue->queue,
2400 sizeof(dp) * queue->alloc);
2401 }
2402 queue->queue[queue->nr++] = dp;
2403 }
2404
2405 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2406 struct diff_filespec *one,
2407 struct diff_filespec *two)
2408 {
2409 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2410 dp->one = one;
2411 dp->two = two;
2412 if (queue)
2413 diff_q(queue, dp);
2414 return dp;
2415 }
2416
2417 void diff_free_filepair(struct diff_filepair *p)
2418 {
2419 free_filespec(p->one);
2420 free_filespec(p->two);
2421 free(p);
2422 }
2423
2424 /* This is different from find_unique_abbrev() in that
2425 * it stuffs the result with dots for alignment.
2426 */
2427 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2428 {
2429 int abblen;
2430 const char *abbrev;
2431 if (len == 40)
2432 return sha1_to_hex(sha1);
2433
2434 abbrev = find_unique_abbrev(sha1, len);
2435 if (!abbrev)
2436 return sha1_to_hex(sha1);
2437 abblen = strlen(abbrev);
2438 if (abblen < 37) {
2439 static char hex[41];
2440 if (len < abblen && abblen <= len + 2)
2441 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2442 else
2443 sprintf(hex, "%s...", abbrev);
2444 return hex;
2445 }
2446 return sha1_to_hex(sha1);
2447 }
2448
2449 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2450 {
2451 int line_termination = opt->line_termination;
2452 int inter_name_termination = line_termination ? '\t' : '\0';
2453
2454 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2455 printf(":%06o %06o %s ", p->one->mode, p->two->mode,
2456 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2457 printf("%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2458 }
2459 if (p->score) {
2460 printf("%c%03d%c", p->status, similarity_index(p),
2461 inter_name_termination);
2462 } else {
2463 printf("%c%c", p->status, inter_name_termination);
2464 }
2465
2466 if (p->status == DIFF_STATUS_COPIED || p->status == DIFF_STATUS_RENAMED) {
2467 write_name_quoted(p->one->path, stdout, inter_name_termination);
2468 write_name_quoted(p->two->path, stdout, line_termination);
2469 } else {
2470 const char *path = p->one->mode ? p->one->path : p->two->path;
2471 write_name_quoted(path, stdout, line_termination);
2472 }
2473 }
2474
2475 int diff_unmodified_pair(struct diff_filepair *p)
2476 {
2477 /* This function is written stricter than necessary to support
2478 * the currently implemented transformers, but the idea is to
2479 * let transformers to produce diff_filepairs any way they want,
2480 * and filter and clean them up here before producing the output.
2481 */
2482 struct diff_filespec *one = p->one, *two = p->two;
2483
2484 if (DIFF_PAIR_UNMERGED(p))
2485 return 0; /* unmerged is interesting */
2486
2487 /* deletion, addition, mode or type change
2488 * and rename are all interesting.
2489 */
2490 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2491 DIFF_PAIR_MODE_CHANGED(p) ||
2492 strcmp(one->path, two->path))
2493 return 0;
2494
2495 /* both are valid and point at the same path. that is, we are
2496 * dealing with a change.
2497 */
2498 if (one->sha1_valid && two->sha1_valid &&
2499 !hashcmp(one->sha1, two->sha1))
2500 return 1; /* no change */
2501 if (!one->sha1_valid && !two->sha1_valid)
2502 return 1; /* both look at the same file on the filesystem. */
2503 return 0;
2504 }
2505
2506 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2507 {
2508 if (diff_unmodified_pair(p))
2509 return;
2510
2511 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2512 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2513 return; /* no tree diffs in patch format */
2514
2515 run_diff(p, o);
2516 }
2517
2518 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2519 struct diffstat_t *diffstat)
2520 {
2521 if (diff_unmodified_pair(p))
2522 return;
2523
2524 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2525 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2526 return; /* no tree diffs in patch format */
2527
2528 run_diffstat(p, o, diffstat);
2529 }
2530
2531 static void diff_flush_checkdiff(struct diff_filepair *p,
2532 struct diff_options *o)
2533 {
2534 if (diff_unmodified_pair(p))
2535 return;
2536
2537 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2538 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2539 return; /* no tree diffs in patch format */
2540
2541 run_checkdiff(p, o);
2542 }
2543
2544 int diff_queue_is_empty(void)
2545 {
2546 struct diff_queue_struct *q = &diff_queued_diff;
2547 int i;
2548 for (i = 0; i < q->nr; i++)
2549 if (!diff_unmodified_pair(q->queue[i]))
2550 return 0;
2551 return 1;
2552 }
2553
2554 #if DIFF_DEBUG
2555 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2556 {
2557 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2558 x, one ? one : "",
2559 s->path,
2560 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2561 s->mode,
2562 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2563 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2564 x, one ? one : "",
2565 s->size, s->xfrm_flags);
2566 }
2567
2568 void diff_debug_filepair(const struct diff_filepair *p, int i)
2569 {
2570 diff_debug_filespec(p->one, i, "one");
2571 diff_debug_filespec(p->two, i, "two");
2572 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2573 p->score, p->status ? p->status : '?',
2574 p->one->rename_used, p->broken_pair);
2575 }
2576
2577 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2578 {
2579 int i;
2580 if (msg)
2581 fprintf(stderr, "%s\n", msg);
2582 fprintf(stderr, "q->nr = %d\n", q->nr);
2583 for (i = 0; i < q->nr; i++) {
2584 struct diff_filepair *p = q->queue[i];
2585 diff_debug_filepair(p, i);
2586 }
2587 }
2588 #endif
2589
2590 static void diff_resolve_rename_copy(void)
2591 {
2592 int i;
2593 struct diff_filepair *p;
2594 struct diff_queue_struct *q = &diff_queued_diff;
2595
2596 diff_debug_queue("resolve-rename-copy", q);
2597
2598 for (i = 0; i < q->nr; i++) {
2599 p = q->queue[i];
2600 p->status = 0; /* undecided */
2601 if (DIFF_PAIR_UNMERGED(p))
2602 p->status = DIFF_STATUS_UNMERGED;
2603 else if (!DIFF_FILE_VALID(p->one))
2604 p->status = DIFF_STATUS_ADDED;
2605 else if (!DIFF_FILE_VALID(p->two))
2606 p->status = DIFF_STATUS_DELETED;
2607 else if (DIFF_PAIR_TYPE_CHANGED(p))
2608 p->status = DIFF_STATUS_TYPE_CHANGED;
2609
2610 /* from this point on, we are dealing with a pair
2611 * whose both sides are valid and of the same type, i.e.
2612 * either in-place edit or rename/copy edit.
2613 */
2614 else if (DIFF_PAIR_RENAME(p)) {
2615 /*
2616 * A rename might have re-connected a broken
2617 * pair up, causing the pathnames to be the
2618 * same again. If so, that's not a rename at
2619 * all, just a modification..
2620 *
2621 * Otherwise, see if this source was used for
2622 * multiple renames, in which case we decrement
2623 * the count, and call it a copy.
2624 */
2625 if (!strcmp(p->one->path, p->two->path))
2626 p->status = DIFF_STATUS_MODIFIED;
2627 else if (--p->one->rename_used > 0)
2628 p->status = DIFF_STATUS_COPIED;
2629 else
2630 p->status = DIFF_STATUS_RENAMED;
2631 }
2632 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2633 p->one->mode != p->two->mode ||
2634 is_null_sha1(p->one->sha1))
2635 p->status = DIFF_STATUS_MODIFIED;
2636 else {
2637 /* This is a "no-change" entry and should not
2638 * happen anymore, but prepare for broken callers.
2639 */
2640 error("feeding unmodified %s to diffcore",
2641 p->one->path);
2642 p->status = DIFF_STATUS_UNKNOWN;
2643 }
2644 }
2645 diff_debug_queue("resolve-rename-copy done", q);
2646 }
2647
2648 static int check_pair_status(struct diff_filepair *p)
2649 {
2650 switch (p->status) {
2651 case DIFF_STATUS_UNKNOWN:
2652 return 0;
2653 case 0:
2654 die("internal error in diff-resolve-rename-copy");
2655 default:
2656 return 1;
2657 }
2658 }
2659
2660 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2661 {
2662 int fmt = opt->output_format;
2663
2664 if (fmt & DIFF_FORMAT_CHECKDIFF)
2665 diff_flush_checkdiff(p, opt);
2666 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2667 diff_flush_raw(p, opt);
2668 else if (fmt & DIFF_FORMAT_NAME)
2669 write_name_quoted(p->two->path, stdout, opt->line_termination);
2670 }
2671
2672 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2673 {
2674 if (fs->mode)
2675 printf(" %s mode %06o ", newdelete, fs->mode);
2676 else
2677 printf(" %s ", newdelete);
2678 write_name_quoted(fs->path, stdout, '\n');
2679 }
2680
2681
2682 static void show_mode_change(struct diff_filepair *p, int show_name)
2683 {
2684 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2685 printf(" mode change %06o => %06o%c", p->one->mode, p->two->mode,
2686 show_name ? ' ' : '\n');
2687 if (show_name) {
2688 write_name_quoted(p->two->path, stdout, '\n');
2689 }
2690 }
2691 }
2692
2693 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2694 {
2695 char *names = pprint_rename(p->one->path, p->two->path);
2696
2697 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2698 free(names);
2699 show_mode_change(p, 0);
2700 }
2701
2702 static void diff_summary(struct diff_filepair *p)
2703 {
2704 switch(p->status) {
2705 case DIFF_STATUS_DELETED:
2706 show_file_mode_name("delete", p->one);
2707 break;
2708 case DIFF_STATUS_ADDED:
2709 show_file_mode_name("create", p->two);
2710 break;
2711 case DIFF_STATUS_COPIED:
2712 show_rename_copy("copy", p);
2713 break;
2714 case DIFF_STATUS_RENAMED:
2715 show_rename_copy("rename", p);
2716 break;
2717 default:
2718 if (p->score) {
2719 puts(" rewrite ");
2720 write_name_quoted(p->two->path, stdout, ' ');
2721 printf("(%d%%)\n", similarity_index(p));
2722 }
2723 show_mode_change(p, !p->score);
2724 break;
2725 }
2726 }
2727
2728 struct patch_id_t {
2729 struct xdiff_emit_state xm;
2730 SHA_CTX *ctx;
2731 int patchlen;
2732 };
2733
2734 static int remove_space(char *line, int len)
2735 {
2736 int i;
2737 char *dst = line;
2738 unsigned char c;
2739
2740 for (i = 0; i < len; i++)
2741 if (!isspace((c = line[i])))
2742 *dst++ = c;
2743
2744 return dst - line;
2745 }
2746
2747 static void patch_id_consume(void *priv, char *line, unsigned long len)
2748 {
2749 struct patch_id_t *data = priv;
2750 int new_len;
2751
2752 /* Ignore line numbers when computing the SHA1 of the patch */
2753 if (!prefixcmp(line, "@@ -"))
2754 return;
2755
2756 new_len = remove_space(line, len);
2757
2758 SHA1_Update(data->ctx, line, new_len);
2759 data->patchlen += new_len;
2760 }
2761
2762 /* returns 0 upon success, and writes result into sha1 */
2763 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2764 {
2765 struct diff_queue_struct *q = &diff_queued_diff;
2766 int i;
2767 SHA_CTX ctx;
2768 struct patch_id_t data;
2769 char buffer[PATH_MAX * 4 + 20];
2770
2771 SHA1_Init(&ctx);
2772 memset(&data, 0, sizeof(struct patch_id_t));
2773 data.ctx = &ctx;
2774 data.xm.consume = patch_id_consume;
2775
2776 for (i = 0; i < q->nr; i++) {
2777 xpparam_t xpp;
2778 xdemitconf_t xecfg;
2779 xdemitcb_t ecb;
2780 mmfile_t mf1, mf2;
2781 struct diff_filepair *p = q->queue[i];
2782 int len1, len2;
2783
2784 memset(&xecfg, 0, sizeof(xecfg));
2785 if (p->status == 0)
2786 return error("internal diff status error");
2787 if (p->status == DIFF_STATUS_UNKNOWN)
2788 continue;
2789 if (diff_unmodified_pair(p))
2790 continue;
2791 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2792 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2793 continue;
2794 if (DIFF_PAIR_UNMERGED(p))
2795 continue;
2796
2797 diff_fill_sha1_info(p->one);
2798 diff_fill_sha1_info(p->two);
2799 if (fill_mmfile(&mf1, p->one) < 0 ||
2800 fill_mmfile(&mf2, p->two) < 0)
2801 return error("unable to read files to diff");
2802
2803 len1 = remove_space(p->one->path, strlen(p->one->path));
2804 len2 = remove_space(p->two->path, strlen(p->two->path));
2805 if (p->one->mode == 0)
2806 len1 = snprintf(buffer, sizeof(buffer),
2807 "diff--gita/%.*sb/%.*s"
2808 "newfilemode%06o"
2809 "---/dev/null"
2810 "+++b/%.*s",
2811 len1, p->one->path,
2812 len2, p->two->path,
2813 p->two->mode,
2814 len2, p->two->path);
2815 else if (p->two->mode == 0)
2816 len1 = snprintf(buffer, sizeof(buffer),
2817 "diff--gita/%.*sb/%.*s"
2818 "deletedfilemode%06o"
2819 "---a/%.*s"
2820 "+++/dev/null",
2821 len1, p->one->path,
2822 len2, p->two->path,
2823 p->one->mode,
2824 len1, p->one->path);
2825 else
2826 len1 = snprintf(buffer, sizeof(buffer),
2827 "diff--gita/%.*sb/%.*s"
2828 "---a/%.*s"
2829 "+++b/%.*s",
2830 len1, p->one->path,
2831 len2, p->two->path,
2832 len1, p->one->path,
2833 len2, p->two->path);
2834 SHA1_Update(&ctx, buffer, len1);
2835
2836 xpp.flags = XDF_NEED_MINIMAL;
2837 xecfg.ctxlen = 3;
2838 xecfg.flags = XDL_EMIT_FUNCNAMES;
2839 ecb.outf = xdiff_outf;
2840 ecb.priv = &data;
2841 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2842 }
2843
2844 SHA1_Final(sha1, &ctx);
2845 return 0;
2846 }
2847
2848 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2849 {
2850 struct diff_queue_struct *q = &diff_queued_diff;
2851 int i;
2852 int result = diff_get_patch_id(options, sha1);
2853
2854 for (i = 0; i < q->nr; i++)
2855 diff_free_filepair(q->queue[i]);
2856
2857 free(q->queue);
2858 q->queue = NULL;
2859 q->nr = q->alloc = 0;
2860
2861 return result;
2862 }
2863
2864 static int is_summary_empty(const struct diff_queue_struct *q)
2865 {
2866 int i;
2867
2868 for (i = 0; i < q->nr; i++) {
2869 const struct diff_filepair *p = q->queue[i];
2870
2871 switch (p->status) {
2872 case DIFF_STATUS_DELETED:
2873 case DIFF_STATUS_ADDED:
2874 case DIFF_STATUS_COPIED:
2875 case DIFF_STATUS_RENAMED:
2876 return 0;
2877 default:
2878 if (p->score)
2879 return 0;
2880 if (p->one->mode && p->two->mode &&
2881 p->one->mode != p->two->mode)
2882 return 0;
2883 break;
2884 }
2885 }
2886 return 1;
2887 }
2888
2889 void diff_flush(struct diff_options *options)
2890 {
2891 struct diff_queue_struct *q = &diff_queued_diff;
2892 int i, output_format = options->output_format;
2893 int separator = 0;
2894
2895 /*
2896 * Order: raw, stat, summary, patch
2897 * or: name/name-status/checkdiff (other bits clear)
2898 */
2899 if (!q->nr)
2900 goto free_queue;
2901
2902 if (output_format & (DIFF_FORMAT_RAW |
2903 DIFF_FORMAT_NAME |
2904 DIFF_FORMAT_NAME_STATUS |
2905 DIFF_FORMAT_CHECKDIFF)) {
2906 for (i = 0; i < q->nr; i++) {
2907 struct diff_filepair *p = q->queue[i];
2908 if (check_pair_status(p))
2909 flush_one_pair(p, options);
2910 }
2911 separator++;
2912 }
2913
2914 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2915 struct diffstat_t diffstat;
2916
2917 memset(&diffstat, 0, sizeof(struct diffstat_t));
2918 diffstat.xm.consume = diffstat_consume;
2919 for (i = 0; i < q->nr; i++) {
2920 struct diff_filepair *p = q->queue[i];
2921 if (check_pair_status(p))
2922 diff_flush_stat(p, options, &diffstat);
2923 }
2924 if (output_format & DIFF_FORMAT_NUMSTAT)
2925 show_numstat(&diffstat, options);
2926 if (output_format & DIFF_FORMAT_DIFFSTAT)
2927 show_stats(&diffstat, options);
2928 else if (output_format & DIFF_FORMAT_SHORTSTAT)
2929 show_shortstats(&diffstat);
2930 separator++;
2931 }
2932
2933 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2934 for (i = 0; i < q->nr; i++)
2935 diff_summary(q->queue[i]);
2936 separator++;
2937 }
2938
2939 if (output_format & DIFF_FORMAT_PATCH) {
2940 if (separator) {
2941 if (options->stat_sep) {
2942 /* attach patch instead of inline */
2943 fputs(options->stat_sep, stdout);
2944 } else {
2945 putchar(options->line_termination);
2946 }
2947 }
2948
2949 for (i = 0; i < q->nr; i++) {
2950 struct diff_filepair *p = q->queue[i];
2951 if (check_pair_status(p))
2952 diff_flush_patch(p, options);
2953 }
2954 }
2955
2956 if (output_format & DIFF_FORMAT_CALLBACK)
2957 options->format_callback(q, options, options->format_callback_data);
2958
2959 for (i = 0; i < q->nr; i++)
2960 diff_free_filepair(q->queue[i]);
2961 free_queue:
2962 free(q->queue);
2963 q->queue = NULL;
2964 q->nr = q->alloc = 0;
2965 }
2966
2967 static void diffcore_apply_filter(const char *filter)
2968 {
2969 int i;
2970 struct diff_queue_struct *q = &diff_queued_diff;
2971 struct diff_queue_struct outq;
2972 outq.queue = NULL;
2973 outq.nr = outq.alloc = 0;
2974
2975 if (!filter)
2976 return;
2977
2978 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2979 int found;
2980 for (i = found = 0; !found && i < q->nr; i++) {
2981 struct diff_filepair *p = q->queue[i];
2982 if (((p->status == DIFF_STATUS_MODIFIED) &&
2983 ((p->score &&
2984 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2985 (!p->score &&
2986 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2987 ((p->status != DIFF_STATUS_MODIFIED) &&
2988 strchr(filter, p->status)))
2989 found++;
2990 }
2991 if (found)
2992 return;
2993
2994 /* otherwise we will clear the whole queue
2995 * by copying the empty outq at the end of this
2996 * function, but first clear the current entries
2997 * in the queue.
2998 */
2999 for (i = 0; i < q->nr; i++)
3000 diff_free_filepair(q->queue[i]);
3001 }
3002 else {
3003 /* Only the matching ones */
3004 for (i = 0; i < q->nr; i++) {
3005 struct diff_filepair *p = q->queue[i];
3006
3007 if (((p->status == DIFF_STATUS_MODIFIED) &&
3008 ((p->score &&
3009 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3010 (!p->score &&
3011 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3012 ((p->status != DIFF_STATUS_MODIFIED) &&
3013 strchr(filter, p->status)))
3014 diff_q(&outq, p);
3015 else
3016 diff_free_filepair(p);
3017 }
3018 }
3019 free(q->queue);
3020 *q = outq;
3021 }
3022
3023 /* Check whether two filespecs with the same mode and size are identical */
3024 static int diff_filespec_is_identical(struct diff_filespec *one,
3025 struct diff_filespec *two)
3026 {
3027 if (S_ISGITLINK(one->mode)) {
3028 diff_fill_sha1_info(one);
3029 diff_fill_sha1_info(two);
3030 return !hashcmp(one->sha1, two->sha1);
3031 }
3032 if (diff_populate_filespec(one, 0))
3033 return 0;
3034 if (diff_populate_filespec(two, 0))
3035 return 0;
3036 return !memcmp(one->data, two->data, one->size);
3037 }
3038
3039 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3040 {
3041 int i;
3042 struct diff_queue_struct *q = &diff_queued_diff;
3043 struct diff_queue_struct outq;
3044 outq.queue = NULL;
3045 outq.nr = outq.alloc = 0;
3046
3047 for (i = 0; i < q->nr; i++) {
3048 struct diff_filepair *p = q->queue[i];
3049
3050 /*
3051 * 1. Entries that come from stat info dirtyness
3052 * always have both sides (iow, not create/delete),
3053 * one side of the object name is unknown, with
3054 * the same mode and size. Keep the ones that
3055 * do not match these criteria. They have real
3056 * differences.
3057 *
3058 * 2. At this point, the file is known to be modified,
3059 * with the same mode and size, and the object
3060 * name of one side is unknown. Need to inspect
3061 * the identical contents.
3062 */
3063 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3064 !DIFF_FILE_VALID(p->two) ||
3065 (p->one->sha1_valid && p->two->sha1_valid) ||
3066 (p->one->mode != p->two->mode) ||
3067 diff_populate_filespec(p->one, 1) ||
3068 diff_populate_filespec(p->two, 1) ||
3069 (p->one->size != p->two->size) ||
3070 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3071 diff_q(&outq, p);
3072 else {
3073 /*
3074 * The caller can subtract 1 from skip_stat_unmatch
3075 * to determine how many paths were dirty only
3076 * due to stat info mismatch.
3077 */
3078 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3079 diffopt->skip_stat_unmatch++;
3080 diff_free_filepair(p);
3081 }
3082 }
3083 free(q->queue);
3084 *q = outq;
3085 }
3086
3087 void diffcore_std(struct diff_options *options)
3088 {
3089 if (DIFF_OPT_TST(options, QUIET))
3090 return;
3091
3092 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3093 diffcore_skip_stat_unmatch(options);
3094 if (options->break_opt != -1)
3095 diffcore_break(options->break_opt);
3096 if (options->detect_rename)
3097 diffcore_rename(options);
3098 if (options->break_opt != -1)
3099 diffcore_merge_broken();
3100 if (options->pickaxe)
3101 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3102 if (options->orderfile)
3103 diffcore_order(options->orderfile);
3104 diff_resolve_rename_copy();
3105 diffcore_apply_filter(options->filter);
3106
3107 if (diff_queued_diff.nr)
3108 DIFF_OPT_SET(options, HAS_CHANGES);
3109 else
3110 DIFF_OPT_CLR(options, HAS_CHANGES);
3111 }
3112
3113
3114 void diff_addremove(struct diff_options *options,
3115 int addremove, unsigned mode,
3116 const unsigned char *sha1,
3117 const char *base, const char *path)
3118 {
3119 char concatpath[PATH_MAX];
3120 struct diff_filespec *one, *two;
3121
3122 /* This may look odd, but it is a preparation for
3123 * feeding "there are unchanged files which should
3124 * not produce diffs, but when you are doing copy
3125 * detection you would need them, so here they are"
3126 * entries to the diff-core. They will be prefixed
3127 * with something like '=' or '*' (I haven't decided
3128 * which but should not make any difference).
3129 * Feeding the same new and old to diff_change()
3130 * also has the same effect.
3131 * Before the final output happens, they are pruned after
3132 * merged into rename/copy pairs as appropriate.
3133 */
3134 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3135 addremove = (addremove == '+' ? '-' :
3136 addremove == '-' ? '+' : addremove);
3137
3138 if (!path) path = "";
3139 sprintf(concatpath, "%s%s", base, path);
3140 one = alloc_filespec(concatpath);
3141 two = alloc_filespec(concatpath);
3142
3143 if (addremove != '+')
3144 fill_filespec(one, sha1, mode);
3145 if (addremove != '-')
3146 fill_filespec(two, sha1, mode);
3147
3148 diff_queue(&diff_queued_diff, one, two);
3149 DIFF_OPT_SET(options, HAS_CHANGES);
3150 }
3151
3152 void diff_change(struct diff_options *options,
3153 unsigned old_mode, unsigned new_mode,
3154 const unsigned char *old_sha1,
3155 const unsigned char *new_sha1,
3156 const char *base, const char *path)
3157 {
3158 char concatpath[PATH_MAX];
3159 struct diff_filespec *one, *two;
3160
3161 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3162 unsigned tmp;
3163 const unsigned char *tmp_c;
3164 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3165 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3166 }
3167 if (!path) path = "";
3168 sprintf(concatpath, "%s%s", base, path);
3169 one = alloc_filespec(concatpath);
3170 two = alloc_filespec(concatpath);
3171 fill_filespec(one, old_sha1, old_mode);
3172 fill_filespec(two, new_sha1, new_mode);
3173
3174 diff_queue(&diff_queued_diff, one, two);
3175 DIFF_OPT_SET(options, HAS_CHANGES);
3176 }
3177
3178 void diff_unmerge(struct diff_options *options,
3179 const char *path,
3180 unsigned mode, const unsigned char *sha1)
3181 {
3182 struct diff_filespec *one, *two;
3183 one = alloc_filespec(path);
3184 two = alloc_filespec(path);
3185 fill_filespec(one, sha1, mode);
3186 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3187 }