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Merge branch 'mergetool' of git://repo.or.cz/git/mergetool into maint
[alt-git.git] / diff.c
blob0ee9ea1c1b47b82710a3850e7e9f679e4486f7bd
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 char *namebuf;
87 drv = xcalloc(1, sizeof(struct ll_diff_driver));
88 namebuf = xmalloc(namelen + 1);
89 memcpy(namebuf, name, namelen);
90 namebuf[namelen] = 0;
91 drv->name = namebuf;
92 drv->next = NULL;
93 if (!user_diff_tail)
94 user_diff_tail = &user_diff;
95 *user_diff_tail = drv;
96 user_diff_tail = &(drv->next);
97 }
98
99 if (!value)
100 return error("%s: lacks value", var);
101 drv->cmd = strdup(value);
102 return 0;
103 }
104
105 /*
106 * 'diff.<what>.funcname' attribute can be specified in the configuration
107 * to define a customized regexp to find the beginning of a function to
108 * be used for hunk header lines of "diff -p" style output.
109 */
110 static struct funcname_pattern {
111 char *name;
112 char *pattern;
113 struct funcname_pattern *next;
114 } *funcname_pattern_list;
115
116 static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
117 {
118 const char *name;
119 int namelen;
120 struct funcname_pattern *pp;
121
122 name = var + 5; /* "diff." */
123 namelen = ep - name;
124
125 for (pp = funcname_pattern_list; pp; pp = pp->next)
126 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
127 break;
128 if (!pp) {
129 char *namebuf;
130 pp = xcalloc(1, sizeof(*pp));
131 namebuf = xmalloc(namelen + 1);
132 memcpy(namebuf, name, namelen);
133 namebuf[namelen] = 0;
134 pp->name = namebuf;
135 pp->next = funcname_pattern_list;
136 funcname_pattern_list = pp;
137 }
138 if (pp->pattern)
139 free(pp->pattern);
140 pp->pattern = xstrdup(value);
141 return 0;
142 }
143
144 /*
145 * These are to give UI layer defaults.
146 * The core-level commands such as git-diff-files should
147 * never be affected by the setting of diff.renames
148 * the user happens to have in the configuration file.
149 */
150 int git_diff_ui_config(const char *var, const char *value)
151 {
152 if (!strcmp(var, "diff.renamelimit")) {
153 diff_rename_limit_default = git_config_int(var, value);
154 return 0;
155 }
156 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
157 diff_use_color_default = git_config_colorbool(var, value);
158 return 0;
159 }
160 if (!strcmp(var, "diff.renames")) {
161 if (!value)
162 diff_detect_rename_default = DIFF_DETECT_RENAME;
163 else if (!strcasecmp(value, "copies") ||
164 !strcasecmp(value, "copy"))
165 diff_detect_rename_default = DIFF_DETECT_COPY;
166 else if (git_config_bool(var,value))
167 diff_detect_rename_default = DIFF_DETECT_RENAME;
168 return 0;
169 }
170 if (!strcmp(var, "diff.autorefreshindex")) {
171 diff_auto_refresh_index = git_config_bool(var, value);
172 return 0;
173 }
174 if (!prefixcmp(var, "diff.")) {
175 const char *ep = strrchr(var, '.');
176
177 if (ep != var + 4) {
178 if (!strcmp(ep, ".command"))
179 return parse_lldiff_command(var, ep, value);
180 if (!strcmp(ep, ".funcname"))
181 return parse_funcname_pattern(var, ep, value);
182 }
183 }
184 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
185 int slot = parse_diff_color_slot(var, 11);
186 color_parse(value, var, diff_colors[slot]);
187 return 0;
188 }
189
190 return git_default_config(var, value);
191 }
192
193 static char *quote_one(const char *str)
194 {
195 int needlen;
196 char *xp;
197
198 if (!str)
199 return NULL;
200 needlen = quote_c_style(str, NULL, NULL, 0);
201 if (!needlen)
202 return xstrdup(str);
203 xp = xmalloc(needlen + 1);
204 quote_c_style(str, xp, NULL, 0);
205 return xp;
206 }
207
208 static char *quote_two(const char *one, const char *two)
209 {
210 int need_one = quote_c_style(one, NULL, NULL, 1);
211 int need_two = quote_c_style(two, NULL, NULL, 1);
212 char *xp;
213
214 if (need_one + need_two) {
215 if (!need_one) need_one = strlen(one);
216 if (!need_two) need_one = strlen(two);
217
218 xp = xmalloc(need_one + need_two + 3);
219 xp[0] = '"';
220 quote_c_style(one, xp + 1, NULL, 1);
221 quote_c_style(two, xp + need_one + 1, NULL, 1);
222 strcpy(xp + need_one + need_two + 1, "\"");
223 return xp;
224 }
225 need_one = strlen(one);
226 need_two = strlen(two);
227 xp = xmalloc(need_one + need_two + 1);
228 strcpy(xp, one);
229 strcpy(xp + need_one, two);
230 return xp;
231 }
232
233 static const char *external_diff(void)
234 {
235 static const char *external_diff_cmd = NULL;
236 static int done_preparing = 0;
237
238 if (done_preparing)
239 return external_diff_cmd;
240 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
241 done_preparing = 1;
242 return external_diff_cmd;
243 }
244
245 static struct diff_tempfile {
246 const char *name; /* filename external diff should read from */
247 char hex[41];
248 char mode[10];
249 char tmp_path[PATH_MAX];
250 } diff_temp[2];
251
252 static int count_lines(const char *data, int size)
253 {
254 int count, ch, completely_empty = 1, nl_just_seen = 0;
255 count = 0;
256 while (0 < size--) {
257 ch = *data++;
258 if (ch == '\n') {
259 count++;
260 nl_just_seen = 1;
261 completely_empty = 0;
262 }
263 else {
264 nl_just_seen = 0;
265 completely_empty = 0;
266 }
267 }
268 if (completely_empty)
269 return 0;
270 if (!nl_just_seen)
271 count++; /* no trailing newline */
272 return count;
273 }
274
275 static void print_line_count(int count)
276 {
277 switch (count) {
278 case 0:
279 printf("0,0");
280 break;
281 case 1:
282 printf("1");
283 break;
284 default:
285 printf("1,%d", count);
286 break;
287 }
288 }
289
290 static void copy_file(int prefix, const char *data, int size,
291 const char *set, const char *reset)
292 {
293 int ch, nl_just_seen = 1;
294 while (0 < size--) {
295 ch = *data++;
296 if (nl_just_seen) {
297 fputs(set, stdout);
298 putchar(prefix);
299 }
300 if (ch == '\n') {
301 nl_just_seen = 1;
302 fputs(reset, stdout);
303 } else
304 nl_just_seen = 0;
305 putchar(ch);
306 }
307 if (!nl_just_seen)
308 printf("%s\n\\ No newline at end of file\n", reset);
309 }
310
311 static void emit_rewrite_diff(const char *name_a,
312 const char *name_b,
313 struct diff_filespec *one,
314 struct diff_filespec *two,
315 int color_diff)
316 {
317 int lc_a, lc_b;
318 const char *name_a_tab, *name_b_tab;
319 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
320 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
321 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
322 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
323 const char *reset = diff_get_color(color_diff, DIFF_RESET);
324
325 name_a += (*name_a == '/');
326 name_b += (*name_b == '/');
327 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
328 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
329
330 diff_populate_filespec(one, 0);
331 diff_populate_filespec(two, 0);
332 lc_a = count_lines(one->data, one->size);
333 lc_b = count_lines(two->data, two->size);
334 printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
335 metainfo, name_a, name_a_tab, reset,
336 metainfo, name_b, name_b_tab, reset, fraginfo);
337 print_line_count(lc_a);
338 printf(" +");
339 print_line_count(lc_b);
340 printf(" @@%s\n", reset);
341 if (lc_a)
342 copy_file('-', one->data, one->size, old, reset);
343 if (lc_b)
344 copy_file('+', two->data, two->size, new, reset);
345 }
346
347 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
348 {
349 if (!DIFF_FILE_VALID(one)) {
350 mf->ptr = (char *)""; /* does not matter */
351 mf->size = 0;
352 return 0;
353 }
354 else if (diff_populate_filespec(one, 0))
355 return -1;
356 mf->ptr = one->data;
357 mf->size = one->size;
358 return 0;
359 }
360
361 struct diff_words_buffer {
362 mmfile_t text;
363 long alloc;
364 long current; /* output pointer */
365 int suppressed_newline;
366 };
367
368 static void diff_words_append(char *line, unsigned long len,
369 struct diff_words_buffer *buffer)
370 {
371 if (buffer->text.size + len > buffer->alloc) {
372 buffer->alloc = (buffer->text.size + len) * 3 / 2;
373 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
374 }
375 line++;
376 len--;
377 memcpy(buffer->text.ptr + buffer->text.size, line, len);
378 buffer->text.size += len;
379 }
380
381 struct diff_words_data {
382 struct xdiff_emit_state xm;
383 struct diff_words_buffer minus, plus;
384 };
385
386 static void print_word(struct diff_words_buffer *buffer, int len, int color,
387 int suppress_newline)
388 {
389 const char *ptr;
390 int eol = 0;
391
392 if (len == 0)
393 return;
394
395 ptr = buffer->text.ptr + buffer->current;
396 buffer->current += len;
397
398 if (ptr[len - 1] == '\n') {
399 eol = 1;
400 len--;
401 }
402
403 fputs(diff_get_color(1, color), stdout);
404 fwrite(ptr, len, 1, stdout);
405 fputs(diff_get_color(1, DIFF_RESET), stdout);
406
407 if (eol) {
408 if (suppress_newline)
409 buffer->suppressed_newline = 1;
410 else
411 putchar('\n');
412 }
413 }
414
415 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
416 {
417 struct diff_words_data *diff_words = priv;
418
419 if (diff_words->minus.suppressed_newline) {
420 if (line[0] != '+')
421 putchar('\n');
422 diff_words->minus.suppressed_newline = 0;
423 }
424
425 len--;
426 switch (line[0]) {
427 case '-':
428 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
429 break;
430 case '+':
431 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
432 break;
433 case ' ':
434 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
435 diff_words->minus.current += len;
436 break;
437 }
438 }
439
440 /* this executes the word diff on the accumulated buffers */
441 static void diff_words_show(struct diff_words_data *diff_words)
442 {
443 xpparam_t xpp;
444 xdemitconf_t xecfg;
445 xdemitcb_t ecb;
446 mmfile_t minus, plus;
447 int i;
448
449 memset(&xecfg, 0, sizeof(xecfg));
450 minus.size = diff_words->minus.text.size;
451 minus.ptr = xmalloc(minus.size);
452 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
453 for (i = 0; i < minus.size; i++)
454 if (isspace(minus.ptr[i]))
455 minus.ptr[i] = '\n';
456 diff_words->minus.current = 0;
457
458 plus.size = diff_words->plus.text.size;
459 plus.ptr = xmalloc(plus.size);
460 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
461 for (i = 0; i < plus.size; i++)
462 if (isspace(plus.ptr[i]))
463 plus.ptr[i] = '\n';
464 diff_words->plus.current = 0;
465
466 xpp.flags = XDF_NEED_MINIMAL;
467 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
468 ecb.outf = xdiff_outf;
469 ecb.priv = diff_words;
470 diff_words->xm.consume = fn_out_diff_words_aux;
471 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
472
473 free(minus.ptr);
474 free(plus.ptr);
475 diff_words->minus.text.size = diff_words->plus.text.size = 0;
476
477 if (diff_words->minus.suppressed_newline) {
478 putchar('\n');
479 diff_words->minus.suppressed_newline = 0;
480 }
481 }
482
483 struct emit_callback {
484 struct xdiff_emit_state xm;
485 int nparents, color_diff;
486 const char **label_path;
487 struct diff_words_data *diff_words;
488 int *found_changesp;
489 };
490
491 static void free_diff_words_data(struct emit_callback *ecbdata)
492 {
493 if (ecbdata->diff_words) {
494 /* flush buffers */
495 if (ecbdata->diff_words->minus.text.size ||
496 ecbdata->diff_words->plus.text.size)
497 diff_words_show(ecbdata->diff_words);
498
499 if (ecbdata->diff_words->minus.text.ptr)
500 free (ecbdata->diff_words->minus.text.ptr);
501 if (ecbdata->diff_words->plus.text.ptr)
502 free (ecbdata->diff_words->plus.text.ptr);
503 free(ecbdata->diff_words);
504 ecbdata->diff_words = NULL;
505 }
506 }
507
508 const char *diff_get_color(int diff_use_color, enum color_diff ix)
509 {
510 if (diff_use_color)
511 return diff_colors[ix];
512 return "";
513 }
514
515 static void emit_line(const char *set, const char *reset, const char *line, int len)
516 {
517 if (len > 0 && line[len-1] == '\n')
518 len--;
519 fputs(set, stdout);
520 fwrite(line, len, 1, stdout);
521 puts(reset);
522 }
523
524 static void emit_line_with_ws(int nparents,
525 const char *set, const char *reset, const char *ws,
526 const char *line, int len)
527 {
528 int col0 = nparents;
529 int last_tab_in_indent = -1;
530 int last_space_in_indent = -1;
531 int i;
532 int tail = len;
533 int need_highlight_leading_space = 0;
534 /* The line is a newly added line. Does it have funny leading
535 * whitespaces? In indent, SP should never precede a TAB.
536 */
537 for (i = col0; i < len; i++) {
538 if (line[i] == '\t') {
539 last_tab_in_indent = i;
540 if (0 <= last_space_in_indent)
541 need_highlight_leading_space = 1;
542 }
543 else if (line[i] == ' ')
544 last_space_in_indent = i;
545 else
546 break;
547 }
548 fputs(set, stdout);
549 fwrite(line, col0, 1, stdout);
550 fputs(reset, stdout);
551 if (((i == len) || line[i] == '\n') && i != col0) {
552 /* The whole line was indent */
553 emit_line(ws, reset, line + col0, len - col0);
554 return;
555 }
556 i = col0;
557 if (need_highlight_leading_space) {
558 while (i < last_tab_in_indent) {
559 if (line[i] == ' ') {
560 fputs(ws, stdout);
561 putchar(' ');
562 fputs(reset, stdout);
563 }
564 else
565 putchar(line[i]);
566 i++;
567 }
568 }
569 tail = len - 1;
570 if (line[tail] == '\n' && i < tail)
571 tail--;
572 while (i < tail) {
573 if (!isspace(line[tail]))
574 break;
575 tail--;
576 }
577 if ((i < tail && line[tail + 1] != '\n')) {
578 /* This has whitespace between tail+1..len */
579 fputs(set, stdout);
580 fwrite(line + i, tail - i + 1, 1, stdout);
581 fputs(reset, stdout);
582 emit_line(ws, reset, line + tail + 1, len - tail - 1);
583 }
584 else
585 emit_line(set, reset, line + i, len - i);
586 }
587
588 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
589 {
590 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
591 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
592
593 if (!*ws)
594 emit_line(set, reset, line, len);
595 else
596 emit_line_with_ws(ecbdata->nparents, set, reset, ws,
597 line, len);
598 }
599
600 static void fn_out_consume(void *priv, char *line, unsigned long len)
601 {
602 int i;
603 int color;
604 struct emit_callback *ecbdata = priv;
605 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
606 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
607
608 *(ecbdata->found_changesp) = 1;
609
610 if (ecbdata->label_path[0]) {
611 const char *name_a_tab, *name_b_tab;
612
613 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
614 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
615
616 printf("%s--- %s%s%s\n",
617 set, ecbdata->label_path[0], reset, name_a_tab);
618 printf("%s+++ %s%s%s\n",
619 set, ecbdata->label_path[1], reset, name_b_tab);
620 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
621 }
622
623 /* This is not really necessary for now because
624 * this codepath only deals with two-way diffs.
625 */
626 for (i = 0; i < len && line[i] == '@'; i++)
627 ;
628 if (2 <= i && i < len && line[i] == ' ') {
629 ecbdata->nparents = i - 1;
630 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
631 reset, line, len);
632 return;
633 }
634
635 if (len < ecbdata->nparents) {
636 set = reset;
637 emit_line(reset, reset, line, len);
638 return;
639 }
640
641 color = DIFF_PLAIN;
642 if (ecbdata->diff_words && ecbdata->nparents != 1)
643 /* fall back to normal diff */
644 free_diff_words_data(ecbdata);
645 if (ecbdata->diff_words) {
646 if (line[0] == '-') {
647 diff_words_append(line, len,
648 &ecbdata->diff_words->minus);
649 return;
650 } else if (line[0] == '+') {
651 diff_words_append(line, len,
652 &ecbdata->diff_words->plus);
653 return;
654 }
655 if (ecbdata->diff_words->minus.text.size ||
656 ecbdata->diff_words->plus.text.size)
657 diff_words_show(ecbdata->diff_words);
658 line++;
659 len--;
660 emit_line(set, reset, line, len);
661 return;
662 }
663 for (i = 0; i < ecbdata->nparents && len; i++) {
664 if (line[i] == '-')
665 color = DIFF_FILE_OLD;
666 else if (line[i] == '+')
667 color = DIFF_FILE_NEW;
668 }
669
670 if (color != DIFF_FILE_NEW) {
671 emit_line(diff_get_color(ecbdata->color_diff, color),
672 reset, line, len);
673 return;
674 }
675 emit_add_line(reset, ecbdata, line, len);
676 }
677
678 static char *pprint_rename(const char *a, const char *b)
679 {
680 const char *old = a;
681 const char *new = b;
682 char *name = NULL;
683 int pfx_length, sfx_length;
684 int len_a = strlen(a);
685 int len_b = strlen(b);
686 int qlen_a = quote_c_style(a, NULL, NULL, 0);
687 int qlen_b = quote_c_style(b, NULL, NULL, 0);
688
689 if (qlen_a || qlen_b) {
690 if (qlen_a) len_a = qlen_a;
691 if (qlen_b) len_b = qlen_b;
692 name = xmalloc( len_a + len_b + 5 );
693 if (qlen_a)
694 quote_c_style(a, name, NULL, 0);
695 else
696 memcpy(name, a, len_a);
697 memcpy(name + len_a, " => ", 4);
698 if (qlen_b)
699 quote_c_style(b, name + len_a + 4, NULL, 0);
700 else
701 memcpy(name + len_a + 4, b, len_b + 1);
702 return name;
703 }
704
705 /* Find common prefix */
706 pfx_length = 0;
707 while (*old && *new && *old == *new) {
708 if (*old == '/')
709 pfx_length = old - a + 1;
710 old++;
711 new++;
712 }
713
714 /* Find common suffix */
715 old = a + len_a;
716 new = b + len_b;
717 sfx_length = 0;
718 while (a <= old && b <= new && *old == *new) {
719 if (*old == '/')
720 sfx_length = len_a - (old - a);
721 old--;
722 new--;
723 }
724
725 /*
726 * pfx{mid-a => mid-b}sfx
727 * {pfx-a => pfx-b}sfx
728 * pfx{sfx-a => sfx-b}
729 * name-a => name-b
730 */
731 if (pfx_length + sfx_length) {
732 int a_midlen = len_a - pfx_length - sfx_length;
733 int b_midlen = len_b - pfx_length - sfx_length;
734 if (a_midlen < 0) a_midlen = 0;
735 if (b_midlen < 0) b_midlen = 0;
736
737 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
738 sprintf(name, "%.*s{%.*s => %.*s}%s",
739 pfx_length, a,
740 a_midlen, a + pfx_length,
741 b_midlen, b + pfx_length,
742 a + len_a - sfx_length);
743 }
744 else {
745 name = xmalloc(len_a + len_b + 5);
746 sprintf(name, "%s => %s", a, b);
747 }
748 return name;
749 }
750
751 struct diffstat_t {
752 struct xdiff_emit_state xm;
753
754 int nr;
755 int alloc;
756 struct diffstat_file {
757 char *name;
758 unsigned is_unmerged:1;
759 unsigned is_binary:1;
760 unsigned is_renamed:1;
761 unsigned int added, deleted;
762 } **files;
763 };
764
765 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
766 const char *name_a,
767 const char *name_b)
768 {
769 struct diffstat_file *x;
770 x = xcalloc(sizeof (*x), 1);
771 if (diffstat->nr == diffstat->alloc) {
772 diffstat->alloc = alloc_nr(diffstat->alloc);
773 diffstat->files = xrealloc(diffstat->files,
774 diffstat->alloc * sizeof(x));
775 }
776 diffstat->files[diffstat->nr++] = x;
777 if (name_b) {
778 x->name = pprint_rename(name_a, name_b);
779 x->is_renamed = 1;
780 }
781 else
782 x->name = xstrdup(name_a);
783 return x;
784 }
785
786 static void diffstat_consume(void *priv, char *line, unsigned long len)
787 {
788 struct diffstat_t *diffstat = priv;
789 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
790
791 if (line[0] == '+')
792 x->added++;
793 else if (line[0] == '-')
794 x->deleted++;
795 }
796
797 const char mime_boundary_leader[] = "------------";
798
799 static int scale_linear(int it, int width, int max_change)
800 {
801 /*
802 * make sure that at least one '-' is printed if there were deletions,
803 * and likewise for '+'.
804 */
805 if (max_change < 2)
806 return it;
807 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
808 }
809
810 static void show_name(const char *prefix, const char *name, int len,
811 const char *reset, const char *set)
812 {
813 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
814 }
815
816 static void show_graph(char ch, int cnt, const char *set, const char *reset)
817 {
818 if (cnt <= 0)
819 return;
820 printf("%s", set);
821 while (cnt--)
822 putchar(ch);
823 printf("%s", reset);
824 }
825
826 static void show_stats(struct diffstat_t* data, struct diff_options *options)
827 {
828 int i, len, add, del, total, adds = 0, dels = 0;
829 int max_change = 0, max_len = 0;
830 int total_files = data->nr;
831 int width, name_width;
832 const char *reset, *set, *add_c, *del_c;
833
834 if (data->nr == 0)
835 return;
836
837 width = options->stat_width ? options->stat_width : 80;
838 name_width = options->stat_name_width ? options->stat_name_width : 50;
839
840 /* Sanity: give at least 5 columns to the graph,
841 * but leave at least 10 columns for the name.
842 */
843 if (width < name_width + 15) {
844 if (name_width <= 25)
845 width = name_width + 15;
846 else
847 name_width = width - 15;
848 }
849
850 /* Find the longest filename and max number of changes */
851 reset = diff_get_color(options->color_diff, DIFF_RESET);
852 set = diff_get_color(options->color_diff, DIFF_PLAIN);
853 add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
854 del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
855
856 for (i = 0; i < data->nr; i++) {
857 struct diffstat_file *file = data->files[i];
858 int change = file->added + file->deleted;
859
860 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
861 len = quote_c_style(file->name, NULL, NULL, 0);
862 if (len) {
863 char *qname = xmalloc(len + 1);
864 quote_c_style(file->name, qname, NULL, 0);
865 free(file->name);
866 file->name = qname;
867 }
868 }
869
870 len = strlen(file->name);
871 if (max_len < len)
872 max_len = len;
873
874 if (file->is_binary || file->is_unmerged)
875 continue;
876 if (max_change < change)
877 max_change = change;
878 }
879
880 /* Compute the width of the graph part;
881 * 10 is for one blank at the beginning of the line plus
882 * " | count " between the name and the graph.
883 *
884 * From here on, name_width is the width of the name area,
885 * and width is the width of the graph area.
886 */
887 name_width = (name_width < max_len) ? name_width : max_len;
888 if (width < (name_width + 10) + max_change)
889 width = width - (name_width + 10);
890 else
891 width = max_change;
892
893 for (i = 0; i < data->nr; i++) {
894 const char *prefix = "";
895 char *name = data->files[i]->name;
896 int added = data->files[i]->added;
897 int deleted = data->files[i]->deleted;
898 int name_len;
899
900 /*
901 * "scale" the filename
902 */
903 len = name_width;
904 name_len = strlen(name);
905 if (name_width < name_len) {
906 char *slash;
907 prefix = "...";
908 len -= 3;
909 name += name_len - len;
910 slash = strchr(name, '/');
911 if (slash)
912 name = slash;
913 }
914
915 if (data->files[i]->is_binary) {
916 show_name(prefix, name, len, reset, set);
917 printf(" Bin ");
918 printf("%s%d%s", del_c, deleted, reset);
919 printf(" -> ");
920 printf("%s%d%s", add_c, added, reset);
921 printf(" bytes");
922 printf("\n");
923 goto free_diffstat_file;
924 }
925 else if (data->files[i]->is_unmerged) {
926 show_name(prefix, name, len, reset, set);
927 printf(" Unmerged\n");
928 goto free_diffstat_file;
929 }
930 else if (!data->files[i]->is_renamed &&
931 (added + deleted == 0)) {
932 total_files--;
933 goto free_diffstat_file;
934 }
935
936 /*
937 * scale the add/delete
938 */
939 add = added;
940 del = deleted;
941 total = add + del;
942 adds += add;
943 dels += del;
944
945 if (width <= max_change) {
946 add = scale_linear(add, width, max_change);
947 del = scale_linear(del, width, max_change);
948 total = add + del;
949 }
950 show_name(prefix, name, len, reset, set);
951 printf("%5d ", added + deleted);
952 show_graph('+', add, add_c, reset);
953 show_graph('-', del, del_c, reset);
954 putchar('\n');
955 free_diffstat_file:
956 free(data->files[i]->name);
957 free(data->files[i]);
958 }
959 free(data->files);
960 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
961 set, total_files, adds, dels, reset);
962 }
963
964 static void show_shortstats(struct diffstat_t* data)
965 {
966 int i, adds = 0, dels = 0, total_files = data->nr;
967
968 if (data->nr == 0)
969 return;
970
971 for (i = 0; i < data->nr; i++) {
972 if (!data->files[i]->is_binary &&
973 !data->files[i]->is_unmerged) {
974 int added = data->files[i]->added;
975 int deleted= data->files[i]->deleted;
976 if (!data->files[i]->is_renamed &&
977 (added + deleted == 0)) {
978 total_files--;
979 } else {
980 adds += added;
981 dels += deleted;
982 }
983 }
984 free(data->files[i]->name);
985 free(data->files[i]);
986 }
987 free(data->files);
988
989 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
990 total_files, adds, dels);
991 }
992
993 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
994 {
995 int i;
996
997 for (i = 0; i < data->nr; i++) {
998 struct diffstat_file *file = data->files[i];
999
1000 if (file->is_binary)
1001 printf("-\t-\t");
1002 else
1003 printf("%d\t%d\t", file->added, file->deleted);
1004 if (options->line_termination && !file->is_renamed &&
1005 quote_c_style(file->name, NULL, NULL, 0))
1006 quote_c_style(file->name, NULL, stdout, 0);
1007 else
1008 fputs(file->name, stdout);
1009 putchar(options->line_termination);
1010 }
1011 }
1012
1013 struct checkdiff_t {
1014 struct xdiff_emit_state xm;
1015 const char *filename;
1016 int lineno, color_diff;
1017 };
1018
1019 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1020 {
1021 struct checkdiff_t *data = priv;
1022 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
1023 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
1024 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
1025
1026 if (line[0] == '+') {
1027 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
1028
1029 /* check space before tab */
1030 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
1031 if (line[i] == ' ')
1032 spaces++;
1033 if (line[i - 1] == '\t' && spaces)
1034 space_before_tab = 1;
1035
1036 /* check white space at line end */
1037 if (line[len - 1] == '\n')
1038 len--;
1039 if (isspace(line[len - 1]))
1040 white_space_at_end = 1;
1041
1042 if (space_before_tab || white_space_at_end) {
1043 printf("%s:%d: %s", data->filename, data->lineno, ws);
1044 if (space_before_tab) {
1045 printf("space before tab");
1046 if (white_space_at_end)
1047 putchar(',');
1048 }
1049 if (white_space_at_end)
1050 printf("white space at end");
1051 printf(":%s ", reset);
1052 emit_line_with_ws(1, set, reset, ws, line, len);
1053 }
1054
1055 data->lineno++;
1056 } else if (line[0] == ' ')
1057 data->lineno++;
1058 else if (line[0] == '@') {
1059 char *plus = strchr(line, '+');
1060 if (plus)
1061 data->lineno = strtol(plus, NULL, 10);
1062 else
1063 die("invalid diff");
1064 }
1065 }
1066
1067 static unsigned char *deflate_it(char *data,
1068 unsigned long size,
1069 unsigned long *result_size)
1070 {
1071 int bound;
1072 unsigned char *deflated;
1073 z_stream stream;
1074
1075 memset(&stream, 0, sizeof(stream));
1076 deflateInit(&stream, zlib_compression_level);
1077 bound = deflateBound(&stream, size);
1078 deflated = xmalloc(bound);
1079 stream.next_out = deflated;
1080 stream.avail_out = bound;
1081
1082 stream.next_in = (unsigned char *)data;
1083 stream.avail_in = size;
1084 while (deflate(&stream, Z_FINISH) == Z_OK)
1085 ; /* nothing */
1086 deflateEnd(&stream);
1087 *result_size = stream.total_out;
1088 return deflated;
1089 }
1090
1091 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1092 {
1093 void *cp;
1094 void *delta;
1095 void *deflated;
1096 void *data;
1097 unsigned long orig_size;
1098 unsigned long delta_size;
1099 unsigned long deflate_size;
1100 unsigned long data_size;
1101
1102 /* We could do deflated delta, or we could do just deflated two,
1103 * whichever is smaller.
1104 */
1105 delta = NULL;
1106 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1107 if (one->size && two->size) {
1108 delta = diff_delta(one->ptr, one->size,
1109 two->ptr, two->size,
1110 &delta_size, deflate_size);
1111 if (delta) {
1112 void *to_free = delta;
1113 orig_size = delta_size;
1114 delta = deflate_it(delta, delta_size, &delta_size);
1115 free(to_free);
1116 }
1117 }
1118
1119 if (delta && delta_size < deflate_size) {
1120 printf("delta %lu\n", orig_size);
1121 free(deflated);
1122 data = delta;
1123 data_size = delta_size;
1124 }
1125 else {
1126 printf("literal %lu\n", two->size);
1127 free(delta);
1128 data = deflated;
1129 data_size = deflate_size;
1130 }
1131
1132 /* emit data encoded in base85 */
1133 cp = data;
1134 while (data_size) {
1135 int bytes = (52 < data_size) ? 52 : data_size;
1136 char line[70];
1137 data_size -= bytes;
1138 if (bytes <= 26)
1139 line[0] = bytes + 'A' - 1;
1140 else
1141 line[0] = bytes - 26 + 'a' - 1;
1142 encode_85(line + 1, cp, bytes);
1143 cp = (char *) cp + bytes;
1144 puts(line);
1145 }
1146 printf("\n");
1147 free(data);
1148 }
1149
1150 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1151 {
1152 printf("GIT binary patch\n");
1153 emit_binary_diff_body(one, two);
1154 emit_binary_diff_body(two, one);
1155 }
1156
1157 static void setup_diff_attr_check(struct git_attr_check *check)
1158 {
1159 static struct git_attr *attr_diff;
1160
1161 if (!attr_diff) {
1162 attr_diff = git_attr("diff", 4);
1163 }
1164 check[0].attr = attr_diff;
1165 }
1166
1167 static void diff_filespec_check_attr(struct diff_filespec *one)
1168 {
1169 struct git_attr_check attr_diff_check;
1170 int check_from_data = 0;
1171
1172 if (one->checked_attr)
1173 return;
1174
1175 setup_diff_attr_check(&attr_diff_check);
1176 one->is_binary = 0;
1177 one->funcname_pattern_ident = NULL;
1178
1179 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1180 const char *value;
1181
1182 /* binaryness */
1183 value = attr_diff_check.value;
1184 if (ATTR_TRUE(value))
1185 ;
1186 else if (ATTR_FALSE(value))
1187 one->is_binary = 1;
1188 else
1189 check_from_data = 1;
1190
1191 /* funcname pattern ident */
1192 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1193 ;
1194 else
1195 one->funcname_pattern_ident = value;
1196 }
1197
1198 if (check_from_data) {
1199 if (!one->data && DIFF_FILE_VALID(one))
1200 diff_populate_filespec(one, 0);
1201
1202 if (one->data)
1203 one->is_binary = buffer_is_binary(one->data, one->size);
1204 }
1205 }
1206
1207 int diff_filespec_is_binary(struct diff_filespec *one)
1208 {
1209 diff_filespec_check_attr(one);
1210 return one->is_binary;
1211 }
1212
1213 static const char *funcname_pattern(const char *ident)
1214 {
1215 struct funcname_pattern *pp;
1216
1217 read_config_if_needed();
1218 for (pp = funcname_pattern_list; pp; pp = pp->next)
1219 if (!strcmp(ident, pp->name))
1220 return pp->pattern;
1221 return NULL;
1222 }
1223
1224 static struct builtin_funcname_pattern {
1225 const char *name;
1226 const char *pattern;
1227 } builtin_funcname_pattern[] = {
1228 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1229 "new\\|return\\|switch\\|throw\\|while\\)\n"
1230 "^[ ]*\\(\\([ ]*"
1231 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1232 "[ ]*([^;]*$\\)" },
1233 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1234 };
1235
1236 static const char *diff_funcname_pattern(struct diff_filespec *one)
1237 {
1238 const char *ident, *pattern;
1239 int i;
1240
1241 diff_filespec_check_attr(one);
1242 ident = one->funcname_pattern_ident;
1243
1244 if (!ident)
1245 /*
1246 * If the config file has "funcname.default" defined, that
1247 * regexp is used; otherwise NULL is returned and xemit uses
1248 * the built-in default.
1249 */
1250 return funcname_pattern("default");
1251
1252 /* Look up custom "funcname.$ident" regexp from config. */
1253 pattern = funcname_pattern(ident);
1254 if (pattern)
1255 return pattern;
1256
1257 /*
1258 * And define built-in fallback patterns here. Note that
1259 * these can be overriden by the user's config settings.
1260 */
1261 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1262 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1263 return builtin_funcname_pattern[i].pattern;
1264
1265 return NULL;
1266 }
1267
1268 static void builtin_diff(const char *name_a,
1269 const char *name_b,
1270 struct diff_filespec *one,
1271 struct diff_filespec *two,
1272 const char *xfrm_msg,
1273 struct diff_options *o,
1274 int complete_rewrite)
1275 {
1276 mmfile_t mf1, mf2;
1277 const char *lbl[2];
1278 char *a_one, *b_two;
1279 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1280 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
1281
1282 a_one = quote_two("a/", name_a + (*name_a == '/'));
1283 b_two = quote_two("b/", name_b + (*name_b == '/'));
1284 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1285 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1286 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1287 if (lbl[0][0] == '/') {
1288 /* /dev/null */
1289 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1290 if (xfrm_msg && xfrm_msg[0])
1291 printf("%s%s%s\n", set, xfrm_msg, reset);
1292 }
1293 else if (lbl[1][0] == '/') {
1294 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1295 if (xfrm_msg && xfrm_msg[0])
1296 printf("%s%s%s\n", set, xfrm_msg, reset);
1297 }
1298 else {
1299 if (one->mode != two->mode) {
1300 printf("%sold mode %06o%s\n", set, one->mode, reset);
1301 printf("%snew mode %06o%s\n", set, two->mode, reset);
1302 }
1303 if (xfrm_msg && xfrm_msg[0])
1304 printf("%s%s%s\n", set, xfrm_msg, reset);
1305 /*
1306 * we do not run diff between different kind
1307 * of objects.
1308 */
1309 if ((one->mode ^ two->mode) & S_IFMT)
1310 goto free_ab_and_return;
1311 if (complete_rewrite) {
1312 emit_rewrite_diff(name_a, name_b, one, two,
1313 o->color_diff);
1314 o->found_changes = 1;
1315 goto free_ab_and_return;
1316 }
1317 }
1318
1319 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1320 die("unable to read files to diff");
1321
1322 if (!o->text &&
1323 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1324 /* Quite common confusing case */
1325 if (mf1.size == mf2.size &&
1326 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1327 goto free_ab_and_return;
1328 if (o->binary)
1329 emit_binary_diff(&mf1, &mf2);
1330 else
1331 printf("Binary files %s and %s differ\n",
1332 lbl[0], lbl[1]);
1333 o->found_changes = 1;
1334 }
1335 else {
1336 /* Crazy xdl interfaces.. */
1337 const char *diffopts = getenv("GIT_DIFF_OPTS");
1338 xpparam_t xpp;
1339 xdemitconf_t xecfg;
1340 xdemitcb_t ecb;
1341 struct emit_callback ecbdata;
1342 const char *funcname_pattern;
1343
1344 funcname_pattern = diff_funcname_pattern(one);
1345 if (!funcname_pattern)
1346 funcname_pattern = diff_funcname_pattern(two);
1347
1348 memset(&xecfg, 0, sizeof(xecfg));
1349 memset(&ecbdata, 0, sizeof(ecbdata));
1350 ecbdata.label_path = lbl;
1351 ecbdata.color_diff = o->color_diff;
1352 ecbdata.found_changesp = &o->found_changes;
1353 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1354 xecfg.ctxlen = o->context;
1355 xecfg.flags = XDL_EMIT_FUNCNAMES;
1356 if (funcname_pattern)
1357 xdiff_set_find_func(&xecfg, funcname_pattern);
1358 if (!diffopts)
1359 ;
1360 else if (!prefixcmp(diffopts, "--unified="))
1361 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1362 else if (!prefixcmp(diffopts, "-u"))
1363 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1364 ecb.outf = xdiff_outf;
1365 ecb.priv = &ecbdata;
1366 ecbdata.xm.consume = fn_out_consume;
1367 if (o->color_diff_words)
1368 ecbdata.diff_words =
1369 xcalloc(1, sizeof(struct diff_words_data));
1370 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1371 if (o->color_diff_words)
1372 free_diff_words_data(&ecbdata);
1373 }
1374
1375 free_ab_and_return:
1376 diff_free_filespec_data(one);
1377 diff_free_filespec_data(two);
1378 free(a_one);
1379 free(b_two);
1380 return;
1381 }
1382
1383 static void builtin_diffstat(const char *name_a, const char *name_b,
1384 struct diff_filespec *one,
1385 struct diff_filespec *two,
1386 struct diffstat_t *diffstat,
1387 struct diff_options *o,
1388 int complete_rewrite)
1389 {
1390 mmfile_t mf1, mf2;
1391 struct diffstat_file *data;
1392
1393 data = diffstat_add(diffstat, name_a, name_b);
1394
1395 if (!one || !two) {
1396 data->is_unmerged = 1;
1397 return;
1398 }
1399 if (complete_rewrite) {
1400 diff_populate_filespec(one, 0);
1401 diff_populate_filespec(two, 0);
1402 data->deleted = count_lines(one->data, one->size);
1403 data->added = count_lines(two->data, two->size);
1404 goto free_and_return;
1405 }
1406 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1407 die("unable to read files to diff");
1408
1409 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1410 data->is_binary = 1;
1411 data->added = mf2.size;
1412 data->deleted = mf1.size;
1413 } else {
1414 /* Crazy xdl interfaces.. */
1415 xpparam_t xpp;
1416 xdemitconf_t xecfg;
1417 xdemitcb_t ecb;
1418
1419 memset(&xecfg, 0, sizeof(xecfg));
1420 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1421 ecb.outf = xdiff_outf;
1422 ecb.priv = diffstat;
1423 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1424 }
1425
1426 free_and_return:
1427 diff_free_filespec_data(one);
1428 diff_free_filespec_data(two);
1429 }
1430
1431 static void builtin_checkdiff(const char *name_a, const char *name_b,
1432 struct diff_filespec *one,
1433 struct diff_filespec *two, struct diff_options *o)
1434 {
1435 mmfile_t mf1, mf2;
1436 struct checkdiff_t data;
1437
1438 if (!two)
1439 return;
1440
1441 memset(&data, 0, sizeof(data));
1442 data.xm.consume = checkdiff_consume;
1443 data.filename = name_b ? name_b : name_a;
1444 data.lineno = 0;
1445 data.color_diff = o->color_diff;
1446
1447 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1448 die("unable to read files to diff");
1449
1450 if (diff_filespec_is_binary(two))
1451 goto free_and_return;
1452 else {
1453 /* Crazy xdl interfaces.. */
1454 xpparam_t xpp;
1455 xdemitconf_t xecfg;
1456 xdemitcb_t ecb;
1457
1458 memset(&xecfg, 0, sizeof(xecfg));
1459 xpp.flags = XDF_NEED_MINIMAL;
1460 ecb.outf = xdiff_outf;
1461 ecb.priv = &data;
1462 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1463 }
1464 free_and_return:
1465 diff_free_filespec_data(one);
1466 diff_free_filespec_data(two);
1467 }
1468
1469 struct diff_filespec *alloc_filespec(const char *path)
1470 {
1471 int namelen = strlen(path);
1472 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1473
1474 memset(spec, 0, sizeof(*spec));
1475 spec->path = (char *)(spec + 1);
1476 memcpy(spec->path, path, namelen+1);
1477 return spec;
1478 }
1479
1480 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1481 unsigned short mode)
1482 {
1483 if (mode) {
1484 spec->mode = canon_mode(mode);
1485 hashcpy(spec->sha1, sha1);
1486 spec->sha1_valid = !is_null_sha1(sha1);
1487 }
1488 }
1489
1490 /*
1491 * Given a name and sha1 pair, if the index tells us the file in
1492 * the work tree has that object contents, return true, so that
1493 * prepare_temp_file() does not have to inflate and extract.
1494 */
1495 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1496 {
1497 struct cache_entry *ce;
1498 struct stat st;
1499 int pos, len;
1500
1501 /* We do not read the cache ourselves here, because the
1502 * benchmark with my previous version that always reads cache
1503 * shows that it makes things worse for diff-tree comparing
1504 * two linux-2.6 kernel trees in an already checked out work
1505 * tree. This is because most diff-tree comparisons deal with
1506 * only a small number of files, while reading the cache is
1507 * expensive for a large project, and its cost outweighs the
1508 * savings we get by not inflating the object to a temporary
1509 * file. Practically, this code only helps when we are used
1510 * by diff-cache --cached, which does read the cache before
1511 * calling us.
1512 */
1513 if (!active_cache)
1514 return 0;
1515
1516 /* We want to avoid the working directory if our caller
1517 * doesn't need the data in a normal file, this system
1518 * is rather slow with its stat/open/mmap/close syscalls,
1519 * and the object is contained in a pack file. The pack
1520 * is probably already open and will be faster to obtain
1521 * the data through than the working directory. Loose
1522 * objects however would tend to be slower as they need
1523 * to be individually opened and inflated.
1524 */
1525 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1526 return 0;
1527
1528 len = strlen(name);
1529 pos = cache_name_pos(name, len);
1530 if (pos < 0)
1531 return 0;
1532 ce = active_cache[pos];
1533 if ((lstat(name, &st) < 0) ||
1534 !S_ISREG(st.st_mode) || /* careful! */
1535 ce_match_stat(ce, &st, 0) ||
1536 hashcmp(sha1, ce->sha1))
1537 return 0;
1538 /* we return 1 only when we can stat, it is a regular file,
1539 * stat information matches, and sha1 recorded in the cache
1540 * matches. I.e. we know the file in the work tree really is
1541 * the same as the <name, sha1> pair.
1542 */
1543 return 1;
1544 }
1545
1546 static int populate_from_stdin(struct diff_filespec *s)
1547 {
1548 #define INCREMENT 1024
1549 char *buf;
1550 unsigned long size;
1551 ssize_t got;
1552
1553 size = 0;
1554 buf = NULL;
1555 while (1) {
1556 buf = xrealloc(buf, size + INCREMENT);
1557 got = xread(0, buf + size, INCREMENT);
1558 if (!got)
1559 break; /* EOF */
1560 if (got < 0)
1561 return error("error while reading from stdin %s",
1562 strerror(errno));
1563 size += got;
1564 }
1565 s->should_munmap = 0;
1566 s->data = buf;
1567 s->size = size;
1568 s->should_free = 1;
1569 return 0;
1570 }
1571
1572 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1573 {
1574 int len;
1575 char *data = xmalloc(100);
1576 len = snprintf(data, 100,
1577 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1578 s->data = data;
1579 s->size = len;
1580 s->should_free = 1;
1581 if (size_only) {
1582 s->data = NULL;
1583 free(data);
1584 }
1585 return 0;
1586 }
1587
1588 /*
1589 * While doing rename detection and pickaxe operation, we may need to
1590 * grab the data for the blob (or file) for our own in-core comparison.
1591 * diff_filespec has data and size fields for this purpose.
1592 */
1593 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1594 {
1595 int err = 0;
1596 if (!DIFF_FILE_VALID(s))
1597 die("internal error: asking to populate invalid file.");
1598 if (S_ISDIR(s->mode))
1599 return -1;
1600
1601 if (s->data)
1602 return 0;
1603
1604 if (size_only && 0 < s->size)
1605 return 0;
1606
1607 if (S_ISGITLINK(s->mode))
1608 return diff_populate_gitlink(s, size_only);
1609
1610 if (!s->sha1_valid ||
1611 reuse_worktree_file(s->path, s->sha1, 0)) {
1612 struct stat st;
1613 int fd;
1614 char *buf;
1615 unsigned long size;
1616
1617 if (!strcmp(s->path, "-"))
1618 return populate_from_stdin(s);
1619
1620 if (lstat(s->path, &st) < 0) {
1621 if (errno == ENOENT) {
1622 err_empty:
1623 err = -1;
1624 empty:
1625 s->data = (char *)"";
1626 s->size = 0;
1627 return err;
1628 }
1629 }
1630 s->size = xsize_t(st.st_size);
1631 if (!s->size)
1632 goto empty;
1633 if (size_only)
1634 return 0;
1635 if (S_ISLNK(st.st_mode)) {
1636 int ret;
1637 s->data = xmalloc(s->size);
1638 s->should_free = 1;
1639 ret = readlink(s->path, s->data, s->size);
1640 if (ret < 0) {
1641 free(s->data);
1642 goto err_empty;
1643 }
1644 return 0;
1645 }
1646 fd = open(s->path, O_RDONLY);
1647 if (fd < 0)
1648 goto err_empty;
1649 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1650 close(fd);
1651 s->should_munmap = 1;
1652
1653 /*
1654 * Convert from working tree format to canonical git format
1655 */
1656 size = s->size;
1657 buf = convert_to_git(s->path, s->data, &size);
1658 if (buf) {
1659 munmap(s->data, s->size);
1660 s->should_munmap = 0;
1661 s->data = buf;
1662 s->size = size;
1663 s->should_free = 1;
1664 }
1665 }
1666 else {
1667 enum object_type type;
1668 if (size_only)
1669 type = sha1_object_info(s->sha1, &s->size);
1670 else {
1671 s->data = read_sha1_file(s->sha1, &type, &s->size);
1672 s->should_free = 1;
1673 }
1674 }
1675 return 0;
1676 }
1677
1678 void diff_free_filespec_data(struct diff_filespec *s)
1679 {
1680 if (s->should_free)
1681 free(s->data);
1682 else if (s->should_munmap)
1683 munmap(s->data, s->size);
1684
1685 if (s->should_free || s->should_munmap) {
1686 s->should_free = s->should_munmap = 0;
1687 s->data = NULL;
1688 }
1689 free(s->cnt_data);
1690 s->cnt_data = NULL;
1691 }
1692
1693 static void prep_temp_blob(struct diff_tempfile *temp,
1694 void *blob,
1695 unsigned long size,
1696 const unsigned char *sha1,
1697 int mode)
1698 {
1699 int fd;
1700
1701 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1702 if (fd < 0)
1703 die("unable to create temp-file: %s", strerror(errno));
1704 if (write_in_full(fd, blob, size) != size)
1705 die("unable to write temp-file");
1706 close(fd);
1707 temp->name = temp->tmp_path;
1708 strcpy(temp->hex, sha1_to_hex(sha1));
1709 temp->hex[40] = 0;
1710 sprintf(temp->mode, "%06o", mode);
1711 }
1712
1713 static void prepare_temp_file(const char *name,
1714 struct diff_tempfile *temp,
1715 struct diff_filespec *one)
1716 {
1717 if (!DIFF_FILE_VALID(one)) {
1718 not_a_valid_file:
1719 /* A '-' entry produces this for file-2, and
1720 * a '+' entry produces this for file-1.
1721 */
1722 temp->name = "/dev/null";
1723 strcpy(temp->hex, ".");
1724 strcpy(temp->mode, ".");
1725 return;
1726 }
1727
1728 if (!one->sha1_valid ||
1729 reuse_worktree_file(name, one->sha1, 1)) {
1730 struct stat st;
1731 if (lstat(name, &st) < 0) {
1732 if (errno == ENOENT)
1733 goto not_a_valid_file;
1734 die("stat(%s): %s", name, strerror(errno));
1735 }
1736 if (S_ISLNK(st.st_mode)) {
1737 int ret;
1738 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1739 size_t sz = xsize_t(st.st_size);
1740 if (sizeof(buf) <= st.st_size)
1741 die("symlink too long: %s", name);
1742 ret = readlink(name, buf, sz);
1743 if (ret < 0)
1744 die("readlink(%s)", name);
1745 prep_temp_blob(temp, buf, sz,
1746 (one->sha1_valid ?
1747 one->sha1 : null_sha1),
1748 (one->sha1_valid ?
1749 one->mode : S_IFLNK));
1750 }
1751 else {
1752 /* we can borrow from the file in the work tree */
1753 temp->name = name;
1754 if (!one->sha1_valid)
1755 strcpy(temp->hex, sha1_to_hex(null_sha1));
1756 else
1757 strcpy(temp->hex, sha1_to_hex(one->sha1));
1758 /* Even though we may sometimes borrow the
1759 * contents from the work tree, we always want
1760 * one->mode. mode is trustworthy even when
1761 * !(one->sha1_valid), as long as
1762 * DIFF_FILE_VALID(one).
1763 */
1764 sprintf(temp->mode, "%06o", one->mode);
1765 }
1766 return;
1767 }
1768 else {
1769 if (diff_populate_filespec(one, 0))
1770 die("cannot read data blob for %s", one->path);
1771 prep_temp_blob(temp, one->data, one->size,
1772 one->sha1, one->mode);
1773 }
1774 }
1775
1776 static void remove_tempfile(void)
1777 {
1778 int i;
1779
1780 for (i = 0; i < 2; i++)
1781 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1782 unlink(diff_temp[i].name);
1783 diff_temp[i].name = NULL;
1784 }
1785 }
1786
1787 static void remove_tempfile_on_signal(int signo)
1788 {
1789 remove_tempfile();
1790 signal(SIGINT, SIG_DFL);
1791 raise(signo);
1792 }
1793
1794 static int spawn_prog(const char *pgm, const char **arg)
1795 {
1796 pid_t pid;
1797 int status;
1798
1799 fflush(NULL);
1800 pid = fork();
1801 if (pid < 0)
1802 die("unable to fork");
1803 if (!pid) {
1804 execvp(pgm, (char *const*) arg);
1805 exit(255);
1806 }
1807
1808 while (waitpid(pid, &status, 0) < 0) {
1809 if (errno == EINTR)
1810 continue;
1811 return -1;
1812 }
1813
1814 /* Earlier we did not check the exit status because
1815 * diff exits non-zero if files are different, and
1816 * we are not interested in knowing that. It was a
1817 * mistake which made it harder to quit a diff-*
1818 * session that uses the git-apply-patch-script as
1819 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1820 * should also exit non-zero only when it wants to
1821 * abort the entire diff-* session.
1822 */
1823 if (WIFEXITED(status) && !WEXITSTATUS(status))
1824 return 0;
1825 return -1;
1826 }
1827
1828 /* An external diff command takes:
1829 *
1830 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1831 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1832 *
1833 */
1834 static void run_external_diff(const char *pgm,
1835 const char *name,
1836 const char *other,
1837 struct diff_filespec *one,
1838 struct diff_filespec *two,
1839 const char *xfrm_msg,
1840 int complete_rewrite)
1841 {
1842 const char *spawn_arg[10];
1843 struct diff_tempfile *temp = diff_temp;
1844 int retval;
1845 static int atexit_asked = 0;
1846 const char *othername;
1847 const char **arg = &spawn_arg[0];
1848
1849 othername = (other? other : name);
1850 if (one && two) {
1851 prepare_temp_file(name, &temp[0], one);
1852 prepare_temp_file(othername, &temp[1], two);
1853 if (! atexit_asked &&
1854 (temp[0].name == temp[0].tmp_path ||
1855 temp[1].name == temp[1].tmp_path)) {
1856 atexit_asked = 1;
1857 atexit(remove_tempfile);
1858 }
1859 signal(SIGINT, remove_tempfile_on_signal);
1860 }
1861
1862 if (one && two) {
1863 *arg++ = pgm;
1864 *arg++ = name;
1865 *arg++ = temp[0].name;
1866 *arg++ = temp[0].hex;
1867 *arg++ = temp[0].mode;
1868 *arg++ = temp[1].name;
1869 *arg++ = temp[1].hex;
1870 *arg++ = temp[1].mode;
1871 if (other) {
1872 *arg++ = other;
1873 *arg++ = xfrm_msg;
1874 }
1875 } else {
1876 *arg++ = pgm;
1877 *arg++ = name;
1878 }
1879 *arg = NULL;
1880 retval = spawn_prog(pgm, spawn_arg);
1881 remove_tempfile();
1882 if (retval) {
1883 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1884 exit(1);
1885 }
1886 }
1887
1888 static const char *external_diff_attr(const char *name)
1889 {
1890 struct git_attr_check attr_diff_check;
1891
1892 setup_diff_attr_check(&attr_diff_check);
1893 if (!git_checkattr(name, 1, &attr_diff_check)) {
1894 const char *value = attr_diff_check.value;
1895 if (!ATTR_TRUE(value) &&
1896 !ATTR_FALSE(value) &&
1897 !ATTR_UNSET(value)) {
1898 struct ll_diff_driver *drv;
1899
1900 read_config_if_needed();
1901 for (drv = user_diff; drv; drv = drv->next)
1902 if (!strcmp(drv->name, value))
1903 return drv->cmd;
1904 }
1905 }
1906 return NULL;
1907 }
1908
1909 static void run_diff_cmd(const char *pgm,
1910 const char *name,
1911 const char *other,
1912 struct diff_filespec *one,
1913 struct diff_filespec *two,
1914 const char *xfrm_msg,
1915 struct diff_options *o,
1916 int complete_rewrite)
1917 {
1918 if (!o->allow_external)
1919 pgm = NULL;
1920 else {
1921 const char *cmd = external_diff_attr(name);
1922 if (cmd)
1923 pgm = cmd;
1924 }
1925
1926 if (pgm) {
1927 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1928 complete_rewrite);
1929 return;
1930 }
1931 if (one && two)
1932 builtin_diff(name, other ? other : name,
1933 one, two, xfrm_msg, o, complete_rewrite);
1934 else
1935 printf("* Unmerged path %s\n", name);
1936 }
1937
1938 static void diff_fill_sha1_info(struct diff_filespec *one)
1939 {
1940 if (DIFF_FILE_VALID(one)) {
1941 if (!one->sha1_valid) {
1942 struct stat st;
1943 if (!strcmp(one->path, "-")) {
1944 hashcpy(one->sha1, null_sha1);
1945 return;
1946 }
1947 if (lstat(one->path, &st) < 0)
1948 die("stat %s", one->path);
1949 if (index_path(one->sha1, one->path, &st, 0))
1950 die("cannot hash %s\n", one->path);
1951 }
1952 }
1953 else
1954 hashclr(one->sha1);
1955 }
1956
1957 static int similarity_index(struct diff_filepair *p)
1958 {
1959 return p->score * 100 / MAX_SCORE;
1960 }
1961
1962 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1963 {
1964 const char *pgm = external_diff();
1965 char msg[PATH_MAX*2+300], *xfrm_msg;
1966 struct diff_filespec *one;
1967 struct diff_filespec *two;
1968 const char *name;
1969 const char *other;
1970 char *name_munged, *other_munged;
1971 int complete_rewrite = 0;
1972 int len;
1973
1974 if (DIFF_PAIR_UNMERGED(p)) {
1975 /* unmerged */
1976 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1977 return;
1978 }
1979
1980 name = p->one->path;
1981 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1982 name_munged = quote_one(name);
1983 other_munged = quote_one(other);
1984 one = p->one; two = p->two;
1985
1986 diff_fill_sha1_info(one);
1987 diff_fill_sha1_info(two);
1988
1989 len = 0;
1990 switch (p->status) {
1991 case DIFF_STATUS_COPIED:
1992 len += snprintf(msg + len, sizeof(msg) - len,
1993 "similarity index %d%%\n"
1994 "copy from %s\n"
1995 "copy to %s\n",
1996 similarity_index(p), name_munged, other_munged);
1997 break;
1998 case DIFF_STATUS_RENAMED:
1999 len += snprintf(msg + len, sizeof(msg) - len,
2000 "similarity index %d%%\n"
2001 "rename from %s\n"
2002 "rename to %s\n",
2003 similarity_index(p), name_munged, other_munged);
2004 break;
2005 case DIFF_STATUS_MODIFIED:
2006 if (p->score) {
2007 len += snprintf(msg + len, sizeof(msg) - len,
2008 "dissimilarity index %d%%\n",
2009 similarity_index(p));
2010 complete_rewrite = 1;
2011 break;
2012 }
2013 /* fallthru */
2014 default:
2015 /* nothing */
2016 ;
2017 }
2018
2019 if (hashcmp(one->sha1, two->sha1)) {
2020 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
2021
2022 if (o->binary) {
2023 mmfile_t mf;
2024 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2025 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2026 abbrev = 40;
2027 }
2028 len += snprintf(msg + len, sizeof(msg) - len,
2029 "index %.*s..%.*s",
2030 abbrev, sha1_to_hex(one->sha1),
2031 abbrev, sha1_to_hex(two->sha1));
2032 if (one->mode == two->mode)
2033 len += snprintf(msg + len, sizeof(msg) - len,
2034 " %06o", one->mode);
2035 len += snprintf(msg + len, sizeof(msg) - len, "\n");
2036 }
2037
2038 if (len)
2039 msg[--len] = 0;
2040 xfrm_msg = len ? msg : NULL;
2041
2042 if (!pgm &&
2043 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2044 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2045 /* a filepair that changes between file and symlink
2046 * needs to be split into deletion and creation.
2047 */
2048 struct diff_filespec *null = alloc_filespec(two->path);
2049 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
2050 free(null);
2051 null = alloc_filespec(one->path);
2052 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
2053 free(null);
2054 }
2055 else
2056 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
2057 complete_rewrite);
2058
2059 free(name_munged);
2060 free(other_munged);
2061 }
2062
2063 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2064 struct diffstat_t *diffstat)
2065 {
2066 const char *name;
2067 const char *other;
2068 int complete_rewrite = 0;
2069
2070 if (DIFF_PAIR_UNMERGED(p)) {
2071 /* unmerged */
2072 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2073 return;
2074 }
2075
2076 name = p->one->path;
2077 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2078
2079 diff_fill_sha1_info(p->one);
2080 diff_fill_sha1_info(p->two);
2081
2082 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2083 complete_rewrite = 1;
2084 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2085 }
2086
2087 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2088 {
2089 const char *name;
2090 const char *other;
2091
2092 if (DIFF_PAIR_UNMERGED(p)) {
2093 /* unmerged */
2094 return;
2095 }
2096
2097 name = p->one->path;
2098 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2099
2100 diff_fill_sha1_info(p->one);
2101 diff_fill_sha1_info(p->two);
2102
2103 builtin_checkdiff(name, other, p->one, p->two, o);
2104 }
2105
2106 void diff_setup(struct diff_options *options)
2107 {
2108 memset(options, 0, sizeof(*options));
2109 options->line_termination = '\n';
2110 options->break_opt = -1;
2111 options->rename_limit = -1;
2112 options->context = 3;
2113 options->msg_sep = "";
2114
2115 options->change = diff_change;
2116 options->add_remove = diff_addremove;
2117 options->color_diff = diff_use_color_default;
2118 options->detect_rename = diff_detect_rename_default;
2119 }
2120
2121 int diff_setup_done(struct diff_options *options)
2122 {
2123 int count = 0;
2124
2125 if (options->output_format & DIFF_FORMAT_NAME)
2126 count++;
2127 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2128 count++;
2129 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2130 count++;
2131 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2132 count++;
2133 if (count > 1)
2134 die("--name-only, --name-status, --check and -s are mutually exclusive");
2135
2136 if (options->find_copies_harder)
2137 options->detect_rename = DIFF_DETECT_COPY;
2138
2139 if (options->output_format & (DIFF_FORMAT_NAME |
2140 DIFF_FORMAT_NAME_STATUS |
2141 DIFF_FORMAT_CHECKDIFF |
2142 DIFF_FORMAT_NO_OUTPUT))
2143 options->output_format &= ~(DIFF_FORMAT_RAW |
2144 DIFF_FORMAT_NUMSTAT |
2145 DIFF_FORMAT_DIFFSTAT |
2146 DIFF_FORMAT_SHORTSTAT |
2147 DIFF_FORMAT_SUMMARY |
2148 DIFF_FORMAT_PATCH);
2149
2150 /*
2151 * These cases always need recursive; we do not drop caller-supplied
2152 * recursive bits for other formats here.
2153 */
2154 if (options->output_format & (DIFF_FORMAT_PATCH |
2155 DIFF_FORMAT_NUMSTAT |
2156 DIFF_FORMAT_DIFFSTAT |
2157 DIFF_FORMAT_SHORTSTAT |
2158 DIFF_FORMAT_SUMMARY |
2159 DIFF_FORMAT_CHECKDIFF))
2160 options->recursive = 1;
2161 /*
2162 * Also pickaxe would not work very well if you do not say recursive
2163 */
2164 if (options->pickaxe)
2165 options->recursive = 1;
2166
2167 if (options->detect_rename && options->rename_limit < 0)
2168 options->rename_limit = diff_rename_limit_default;
2169 if (options->setup & DIFF_SETUP_USE_CACHE) {
2170 if (!active_cache)
2171 /* read-cache does not die even when it fails
2172 * so it is safe for us to do this here. Also
2173 * it does not smudge active_cache or active_nr
2174 * when it fails, so we do not have to worry about
2175 * cleaning it up ourselves either.
2176 */
2177 read_cache();
2178 }
2179 if (options->abbrev <= 0 || 40 < options->abbrev)
2180 options->abbrev = 40; /* full */
2181
2182 /*
2183 * It does not make sense to show the first hit we happened
2184 * to have found. It does not make sense not to return with
2185 * exit code in such a case either.
2186 */
2187 if (options->quiet) {
2188 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2189 options->exit_with_status = 1;
2190 }
2191
2192 /*
2193 * If we postprocess in diffcore, we cannot simply return
2194 * upon the first hit. We need to run diff as usual.
2195 */
2196 if (options->pickaxe || options->filter)
2197 options->quiet = 0;
2198
2199 return 0;
2200 }
2201
2202 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2203 {
2204 char c, *eq;
2205 int len;
2206
2207 if (*arg != '-')
2208 return 0;
2209 c = *++arg;
2210 if (!c)
2211 return 0;
2212 if (c == arg_short) {
2213 c = *++arg;
2214 if (!c)
2215 return 1;
2216 if (val && isdigit(c)) {
2217 char *end;
2218 int n = strtoul(arg, &end, 10);
2219 if (*end)
2220 return 0;
2221 *val = n;
2222 return 1;
2223 }
2224 return 0;
2225 }
2226 if (c != '-')
2227 return 0;
2228 arg++;
2229 eq = strchr(arg, '=');
2230 if (eq)
2231 len = eq - arg;
2232 else
2233 len = strlen(arg);
2234 if (!len || strncmp(arg, arg_long, len))
2235 return 0;
2236 if (eq) {
2237 int n;
2238 char *end;
2239 if (!isdigit(*++eq))
2240 return 0;
2241 n = strtoul(eq, &end, 10);
2242 if (*end)
2243 return 0;
2244 *val = n;
2245 }
2246 return 1;
2247 }
2248
2249 static int diff_scoreopt_parse(const char *opt);
2250
2251 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2252 {
2253 const char *arg = av[0];
2254 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2255 options->output_format |= DIFF_FORMAT_PATCH;
2256 else if (opt_arg(arg, 'U', "unified", &options->context))
2257 options->output_format |= DIFF_FORMAT_PATCH;
2258 else if (!strcmp(arg, "--raw"))
2259 options->output_format |= DIFF_FORMAT_RAW;
2260 else if (!strcmp(arg, "--patch-with-raw")) {
2261 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2262 }
2263 else if (!strcmp(arg, "--numstat")) {
2264 options->output_format |= DIFF_FORMAT_NUMSTAT;
2265 }
2266 else if (!strcmp(arg, "--shortstat")) {
2267 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2268 }
2269 else if (!prefixcmp(arg, "--stat")) {
2270 char *end;
2271 int width = options->stat_width;
2272 int name_width = options->stat_name_width;
2273 arg += 6;
2274 end = (char *)arg;
2275
2276 switch (*arg) {
2277 case '-':
2278 if (!prefixcmp(arg, "-width="))
2279 width = strtoul(arg + 7, &end, 10);
2280 else if (!prefixcmp(arg, "-name-width="))
2281 name_width = strtoul(arg + 12, &end, 10);
2282 break;
2283 case '=':
2284 width = strtoul(arg+1, &end, 10);
2285 if (*end == ',')
2286 name_width = strtoul(end+1, &end, 10);
2287 }
2288
2289 /* Important! This checks all the error cases! */
2290 if (*end)
2291 return 0;
2292 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2293 options->stat_name_width = name_width;
2294 options->stat_width = width;
2295 }
2296 else if (!strcmp(arg, "--check"))
2297 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2298 else if (!strcmp(arg, "--summary"))
2299 options->output_format |= DIFF_FORMAT_SUMMARY;
2300 else if (!strcmp(arg, "--patch-with-stat")) {
2301 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2302 }
2303 else if (!strcmp(arg, "-z"))
2304 options->line_termination = 0;
2305 else if (!prefixcmp(arg, "-l"))
2306 options->rename_limit = strtoul(arg+2, NULL, 10);
2307 else if (!strcmp(arg, "--full-index"))
2308 options->full_index = 1;
2309 else if (!strcmp(arg, "--binary")) {
2310 options->output_format |= DIFF_FORMAT_PATCH;
2311 options->binary = 1;
2312 }
2313 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
2314 options->text = 1;
2315 }
2316 else if (!strcmp(arg, "--name-only"))
2317 options->output_format |= DIFF_FORMAT_NAME;
2318 else if (!strcmp(arg, "--name-status"))
2319 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2320 else if (!strcmp(arg, "-R"))
2321 options->reverse_diff = 1;
2322 else if (!prefixcmp(arg, "-S"))
2323 options->pickaxe = arg + 2;
2324 else if (!strcmp(arg, "-s")) {
2325 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2326 }
2327 else if (!prefixcmp(arg, "-O"))
2328 options->orderfile = arg + 2;
2329 else if (!prefixcmp(arg, "--diff-filter="))
2330 options->filter = arg + 14;
2331 else if (!strcmp(arg, "--pickaxe-all"))
2332 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2333 else if (!strcmp(arg, "--pickaxe-regex"))
2334 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2335 else if (!prefixcmp(arg, "-B")) {
2336 if ((options->break_opt =
2337 diff_scoreopt_parse(arg)) == -1)
2338 return -1;
2339 }
2340 else if (!prefixcmp(arg, "-M")) {
2341 if ((options->rename_score =
2342 diff_scoreopt_parse(arg)) == -1)
2343 return -1;
2344 options->detect_rename = DIFF_DETECT_RENAME;
2345 }
2346 else if (!prefixcmp(arg, "-C")) {
2347 if (options->detect_rename == DIFF_DETECT_COPY)
2348 options->find_copies_harder = 1;
2349 if ((options->rename_score =
2350 diff_scoreopt_parse(arg)) == -1)
2351 return -1;
2352 options->detect_rename = DIFF_DETECT_COPY;
2353 }
2354 else if (!strcmp(arg, "--find-copies-harder"))
2355 options->find_copies_harder = 1;
2356 else if (!strcmp(arg, "--follow"))
2357 options->follow_renames = 1;
2358 else if (!strcmp(arg, "--abbrev"))
2359 options->abbrev = DEFAULT_ABBREV;
2360 else if (!prefixcmp(arg, "--abbrev=")) {
2361 options->abbrev = strtoul(arg + 9, NULL, 10);
2362 if (options->abbrev < MINIMUM_ABBREV)
2363 options->abbrev = MINIMUM_ABBREV;
2364 else if (40 < options->abbrev)
2365 options->abbrev = 40;
2366 }
2367 else if (!strcmp(arg, "--color"))
2368 options->color_diff = 1;
2369 else if (!strcmp(arg, "--no-color"))
2370 options->color_diff = 0;
2371 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2372 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2373 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2374 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2375 else if (!strcmp(arg, "--ignore-space-at-eol"))
2376 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2377 else if (!strcmp(arg, "--color-words"))
2378 options->color_diff = options->color_diff_words = 1;
2379 else if (!strcmp(arg, "--no-renames"))
2380 options->detect_rename = 0;
2381 else if (!strcmp(arg, "--exit-code"))
2382 options->exit_with_status = 1;
2383 else if (!strcmp(arg, "--quiet"))
2384 options->quiet = 1;
2385 else if (!strcmp(arg, "--ext-diff"))
2386 options->allow_external = 1;
2387 else if (!strcmp(arg, "--no-ext-diff"))
2388 options->allow_external = 0;
2389 else
2390 return 0;
2391 return 1;
2392 }
2393
2394 static int parse_num(const char **cp_p)
2395 {
2396 unsigned long num, scale;
2397 int ch, dot;
2398 const char *cp = *cp_p;
2399
2400 num = 0;
2401 scale = 1;
2402 dot = 0;
2403 for(;;) {
2404 ch = *cp;
2405 if ( !dot && ch == '.' ) {
2406 scale = 1;
2407 dot = 1;
2408 } else if ( ch == '%' ) {
2409 scale = dot ? scale*100 : 100;
2410 cp++; /* % is always at the end */
2411 break;
2412 } else if ( ch >= '0' && ch <= '9' ) {
2413 if ( scale < 100000 ) {
2414 scale *= 10;
2415 num = (num*10) + (ch-'0');
2416 }
2417 } else {
2418 break;
2419 }
2420 cp++;
2421 }
2422 *cp_p = cp;
2423
2424 /* user says num divided by scale and we say internally that
2425 * is MAX_SCORE * num / scale.
2426 */
2427 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2428 }
2429
2430 static int diff_scoreopt_parse(const char *opt)
2431 {
2432 int opt1, opt2, cmd;
2433
2434 if (*opt++ != '-')
2435 return -1;
2436 cmd = *opt++;
2437 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2438 return -1; /* that is not a -M, -C nor -B option */
2439
2440 opt1 = parse_num(&opt);
2441 if (cmd != 'B')
2442 opt2 = 0;
2443 else {
2444 if (*opt == 0)
2445 opt2 = 0;
2446 else if (*opt != '/')
2447 return -1; /* we expect -B80/99 or -B80 */
2448 else {
2449 opt++;
2450 opt2 = parse_num(&opt);
2451 }
2452 }
2453 if (*opt != 0)
2454 return -1;
2455 return opt1 | (opt2 << 16);
2456 }
2457
2458 struct diff_queue_struct diff_queued_diff;
2459
2460 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2461 {
2462 if (queue->alloc <= queue->nr) {
2463 queue->alloc = alloc_nr(queue->alloc);
2464 queue->queue = xrealloc(queue->queue,
2465 sizeof(dp) * queue->alloc);
2466 }
2467 queue->queue[queue->nr++] = dp;
2468 }
2469
2470 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2471 struct diff_filespec *one,
2472 struct diff_filespec *two)
2473 {
2474 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2475 dp->one = one;
2476 dp->two = two;
2477 if (queue)
2478 diff_q(queue, dp);
2479 return dp;
2480 }
2481
2482 void diff_free_filepair(struct diff_filepair *p)
2483 {
2484 diff_free_filespec_data(p->one);
2485 diff_free_filespec_data(p->two);
2486 free(p->one);
2487 free(p->two);
2488 free(p);
2489 }
2490
2491 /* This is different from find_unique_abbrev() in that
2492 * it stuffs the result with dots for alignment.
2493 */
2494 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2495 {
2496 int abblen;
2497 const char *abbrev;
2498 if (len == 40)
2499 return sha1_to_hex(sha1);
2500
2501 abbrev = find_unique_abbrev(sha1, len);
2502 if (!abbrev)
2503 return sha1_to_hex(sha1);
2504 abblen = strlen(abbrev);
2505 if (abblen < 37) {
2506 static char hex[41];
2507 if (len < abblen && abblen <= len + 2)
2508 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2509 else
2510 sprintf(hex, "%s...", abbrev);
2511 return hex;
2512 }
2513 return sha1_to_hex(sha1);
2514 }
2515
2516 static void diff_flush_raw(struct diff_filepair *p,
2517 struct diff_options *options)
2518 {
2519 int two_paths;
2520 char status[10];
2521 int abbrev = options->abbrev;
2522 const char *path_one, *path_two;
2523 int inter_name_termination = '\t';
2524 int line_termination = options->line_termination;
2525
2526 if (!line_termination)
2527 inter_name_termination = 0;
2528
2529 path_one = p->one->path;
2530 path_two = p->two->path;
2531 if (line_termination) {
2532 path_one = quote_one(path_one);
2533 path_two = quote_one(path_two);
2534 }
2535
2536 if (p->score)
2537 sprintf(status, "%c%03d", p->status, similarity_index(p));
2538 else {
2539 status[0] = p->status;
2540 status[1] = 0;
2541 }
2542 switch (p->status) {
2543 case DIFF_STATUS_COPIED:
2544 case DIFF_STATUS_RENAMED:
2545 two_paths = 1;
2546 break;
2547 case DIFF_STATUS_ADDED:
2548 case DIFF_STATUS_DELETED:
2549 two_paths = 0;
2550 break;
2551 default:
2552 two_paths = 0;
2553 break;
2554 }
2555 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
2556 printf(":%06o %06o %s ",
2557 p->one->mode, p->two->mode,
2558 diff_unique_abbrev(p->one->sha1, abbrev));
2559 printf("%s ",
2560 diff_unique_abbrev(p->two->sha1, abbrev));
2561 }
2562 printf("%s%c%s", status, inter_name_termination,
2563 two_paths || p->one->mode ? path_one : path_two);
2564 if (two_paths)
2565 printf("%c%s", inter_name_termination, path_two);
2566 putchar(line_termination);
2567 if (path_one != p->one->path)
2568 free((void*)path_one);
2569 if (path_two != p->two->path)
2570 free((void*)path_two);
2571 }
2572
2573 static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
2574 {
2575 char *path = p->two->path;
2576
2577 if (opt->line_termination)
2578 path = quote_one(p->two->path);
2579 printf("%s%c", path, opt->line_termination);
2580 if (p->two->path != path)
2581 free(path);
2582 }
2583
2584 int diff_unmodified_pair(struct diff_filepair *p)
2585 {
2586 /* This function is written stricter than necessary to support
2587 * the currently implemented transformers, but the idea is to
2588 * let transformers to produce diff_filepairs any way they want,
2589 * and filter and clean them up here before producing the output.
2590 */
2591 struct diff_filespec *one, *two;
2592
2593 if (DIFF_PAIR_UNMERGED(p))
2594 return 0; /* unmerged is interesting */
2595
2596 one = p->one;
2597 two = p->two;
2598
2599 /* deletion, addition, mode or type change
2600 * and rename are all interesting.
2601 */
2602 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2603 DIFF_PAIR_MODE_CHANGED(p) ||
2604 strcmp(one->path, two->path))
2605 return 0;
2606
2607 /* both are valid and point at the same path. that is, we are
2608 * dealing with a change.
2609 */
2610 if (one->sha1_valid && two->sha1_valid &&
2611 !hashcmp(one->sha1, two->sha1))
2612 return 1; /* no change */
2613 if (!one->sha1_valid && !two->sha1_valid)
2614 return 1; /* both look at the same file on the filesystem. */
2615 return 0;
2616 }
2617
2618 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2619 {
2620 if (diff_unmodified_pair(p))
2621 return;
2622
2623 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2624 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2625 return; /* no tree diffs in patch format */
2626
2627 run_diff(p, o);
2628 }
2629
2630 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2631 struct diffstat_t *diffstat)
2632 {
2633 if (diff_unmodified_pair(p))
2634 return;
2635
2636 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2637 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2638 return; /* no tree diffs in patch format */
2639
2640 run_diffstat(p, o, diffstat);
2641 }
2642
2643 static void diff_flush_checkdiff(struct diff_filepair *p,
2644 struct diff_options *o)
2645 {
2646 if (diff_unmodified_pair(p))
2647 return;
2648
2649 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2650 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2651 return; /* no tree diffs in patch format */
2652
2653 run_checkdiff(p, o);
2654 }
2655
2656 int diff_queue_is_empty(void)
2657 {
2658 struct diff_queue_struct *q = &diff_queued_diff;
2659 int i;
2660 for (i = 0; i < q->nr; i++)
2661 if (!diff_unmodified_pair(q->queue[i]))
2662 return 0;
2663 return 1;
2664 }
2665
2666 #if DIFF_DEBUG
2667 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2668 {
2669 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2670 x, one ? one : "",
2671 s->path,
2672 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2673 s->mode,
2674 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2675 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2676 x, one ? one : "",
2677 s->size, s->xfrm_flags);
2678 }
2679
2680 void diff_debug_filepair(const struct diff_filepair *p, int i)
2681 {
2682 diff_debug_filespec(p->one, i, "one");
2683 diff_debug_filespec(p->two, i, "two");
2684 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2685 p->score, p->status ? p->status : '?',
2686 p->source_stays, p->broken_pair);
2687 }
2688
2689 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2690 {
2691 int i;
2692 if (msg)
2693 fprintf(stderr, "%s\n", msg);
2694 fprintf(stderr, "q->nr = %d\n", q->nr);
2695 for (i = 0; i < q->nr; i++) {
2696 struct diff_filepair *p = q->queue[i];
2697 diff_debug_filepair(p, i);
2698 }
2699 }
2700 #endif
2701
2702 static void diff_resolve_rename_copy(void)
2703 {
2704 int i, j;
2705 struct diff_filepair *p, *pp;
2706 struct diff_queue_struct *q = &diff_queued_diff;
2707
2708 diff_debug_queue("resolve-rename-copy", q);
2709
2710 for (i = 0; i < q->nr; i++) {
2711 p = q->queue[i];
2712 p->status = 0; /* undecided */
2713 if (DIFF_PAIR_UNMERGED(p))
2714 p->status = DIFF_STATUS_UNMERGED;
2715 else if (!DIFF_FILE_VALID(p->one))
2716 p->status = DIFF_STATUS_ADDED;
2717 else if (!DIFF_FILE_VALID(p->two))
2718 p->status = DIFF_STATUS_DELETED;
2719 else if (DIFF_PAIR_TYPE_CHANGED(p))
2720 p->status = DIFF_STATUS_TYPE_CHANGED;
2721
2722 /* from this point on, we are dealing with a pair
2723 * whose both sides are valid and of the same type, i.e.
2724 * either in-place edit or rename/copy edit.
2725 */
2726 else if (DIFF_PAIR_RENAME(p)) {
2727 if (p->source_stays) {
2728 p->status = DIFF_STATUS_COPIED;
2729 continue;
2730 }
2731 /* See if there is some other filepair that
2732 * copies from the same source as us. If so
2733 * we are a copy. Otherwise we are either a
2734 * copy if the path stays, or a rename if it
2735 * does not, but we already handled "stays" case.
2736 */
2737 for (j = i + 1; j < q->nr; j++) {
2738 pp = q->queue[j];
2739 if (strcmp(pp->one->path, p->one->path))
2740 continue; /* not us */
2741 if (!DIFF_PAIR_RENAME(pp))
2742 continue; /* not a rename/copy */
2743 /* pp is a rename/copy from the same source */
2744 p->status = DIFF_STATUS_COPIED;
2745 break;
2746 }
2747 if (!p->status)
2748 p->status = DIFF_STATUS_RENAMED;
2749 }
2750 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2751 p->one->mode != p->two->mode ||
2752 is_null_sha1(p->one->sha1))
2753 p->status = DIFF_STATUS_MODIFIED;
2754 else {
2755 /* This is a "no-change" entry and should not
2756 * happen anymore, but prepare for broken callers.
2757 */
2758 error("feeding unmodified %s to diffcore",
2759 p->one->path);
2760 p->status = DIFF_STATUS_UNKNOWN;
2761 }
2762 }
2763 diff_debug_queue("resolve-rename-copy done", q);
2764 }
2765
2766 static int check_pair_status(struct diff_filepair *p)
2767 {
2768 switch (p->status) {
2769 case DIFF_STATUS_UNKNOWN:
2770 return 0;
2771 case 0:
2772 die("internal error in diff-resolve-rename-copy");
2773 default:
2774 return 1;
2775 }
2776 }
2777
2778 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2779 {
2780 int fmt = opt->output_format;
2781
2782 if (fmt & DIFF_FORMAT_CHECKDIFF)
2783 diff_flush_checkdiff(p, opt);
2784 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2785 diff_flush_raw(p, opt);
2786 else if (fmt & DIFF_FORMAT_NAME)
2787 diff_flush_name(p, opt);
2788 }
2789
2790 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2791 {
2792 char *name = quote_one(fs->path);
2793 if (fs->mode)
2794 printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
2795 else
2796 printf(" %s %s\n", newdelete, name);
2797 free(name);
2798 }
2799
2800
2801 static void show_mode_change(struct diff_filepair *p, int show_name)
2802 {
2803 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2804 if (show_name) {
2805 char *name = quote_one(p->two->path);
2806 printf(" mode change %06o => %06o %s\n",
2807 p->one->mode, p->two->mode, name);
2808 free(name);
2809 }
2810 else
2811 printf(" mode change %06o => %06o\n",
2812 p->one->mode, p->two->mode);
2813 }
2814 }
2815
2816 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2817 {
2818 char *names = pprint_rename(p->one->path, p->two->path);
2819
2820 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2821 free(names);
2822 show_mode_change(p, 0);
2823 }
2824
2825 static void diff_summary(struct diff_filepair *p)
2826 {
2827 switch(p->status) {
2828 case DIFF_STATUS_DELETED:
2829 show_file_mode_name("delete", p->one);
2830 break;
2831 case DIFF_STATUS_ADDED:
2832 show_file_mode_name("create", p->two);
2833 break;
2834 case DIFF_STATUS_COPIED:
2835 show_rename_copy("copy", p);
2836 break;
2837 case DIFF_STATUS_RENAMED:
2838 show_rename_copy("rename", p);
2839 break;
2840 default:
2841 if (p->score) {
2842 char *name = quote_one(p->two->path);
2843 printf(" rewrite %s (%d%%)\n", name,
2844 similarity_index(p));
2845 free(name);
2846 show_mode_change(p, 0);
2847 } else show_mode_change(p, 1);
2848 break;
2849 }
2850 }
2851
2852 struct patch_id_t {
2853 struct xdiff_emit_state xm;
2854 SHA_CTX *ctx;
2855 int patchlen;
2856 };
2857
2858 static int remove_space(char *line, int len)
2859 {
2860 int i;
2861 char *dst = line;
2862 unsigned char c;
2863
2864 for (i = 0; i < len; i++)
2865 if (!isspace((c = line[i])))
2866 *dst++ = c;
2867
2868 return dst - line;
2869 }
2870
2871 static void patch_id_consume(void *priv, char *line, unsigned long len)
2872 {
2873 struct patch_id_t *data = priv;
2874 int new_len;
2875
2876 /* Ignore line numbers when computing the SHA1 of the patch */
2877 if (!prefixcmp(line, "@@ -"))
2878 return;
2879
2880 new_len = remove_space(line, len);
2881
2882 SHA1_Update(data->ctx, line, new_len);
2883 data->patchlen += new_len;
2884 }
2885
2886 /* returns 0 upon success, and writes result into sha1 */
2887 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2888 {
2889 struct diff_queue_struct *q = &diff_queued_diff;
2890 int i;
2891 SHA_CTX ctx;
2892 struct patch_id_t data;
2893 char buffer[PATH_MAX * 4 + 20];
2894
2895 SHA1_Init(&ctx);
2896 memset(&data, 0, sizeof(struct patch_id_t));
2897 data.ctx = &ctx;
2898 data.xm.consume = patch_id_consume;
2899
2900 for (i = 0; i < q->nr; i++) {
2901 xpparam_t xpp;
2902 xdemitconf_t xecfg;
2903 xdemitcb_t ecb;
2904 mmfile_t mf1, mf2;
2905 struct diff_filepair *p = q->queue[i];
2906 int len1, len2;
2907
2908 memset(&xecfg, 0, sizeof(xecfg));
2909 if (p->status == 0)
2910 return error("internal diff status error");
2911 if (p->status == DIFF_STATUS_UNKNOWN)
2912 continue;
2913 if (diff_unmodified_pair(p))
2914 continue;
2915 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2916 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2917 continue;
2918 if (DIFF_PAIR_UNMERGED(p))
2919 continue;
2920
2921 diff_fill_sha1_info(p->one);
2922 diff_fill_sha1_info(p->two);
2923 if (fill_mmfile(&mf1, p->one) < 0 ||
2924 fill_mmfile(&mf2, p->two) < 0)
2925 return error("unable to read files to diff");
2926
2927 len1 = remove_space(p->one->path, strlen(p->one->path));
2928 len2 = remove_space(p->two->path, strlen(p->two->path));
2929 if (p->one->mode == 0)
2930 len1 = snprintf(buffer, sizeof(buffer),
2931 "diff--gita/%.*sb/%.*s"
2932 "newfilemode%06o"
2933 "---/dev/null"
2934 "+++b/%.*s",
2935 len1, p->one->path,
2936 len2, p->two->path,
2937 p->two->mode,
2938 len2, p->two->path);
2939 else if (p->two->mode == 0)
2940 len1 = snprintf(buffer, sizeof(buffer),
2941 "diff--gita/%.*sb/%.*s"
2942 "deletedfilemode%06o"
2943 "---a/%.*s"
2944 "+++/dev/null",
2945 len1, p->one->path,
2946 len2, p->two->path,
2947 p->one->mode,
2948 len1, p->one->path);
2949 else
2950 len1 = snprintf(buffer, sizeof(buffer),
2951 "diff--gita/%.*sb/%.*s"
2952 "---a/%.*s"
2953 "+++b/%.*s",
2954 len1, p->one->path,
2955 len2, p->two->path,
2956 len1, p->one->path,
2957 len2, p->two->path);
2958 SHA1_Update(&ctx, buffer, len1);
2959
2960 xpp.flags = XDF_NEED_MINIMAL;
2961 xecfg.ctxlen = 3;
2962 xecfg.flags = XDL_EMIT_FUNCNAMES;
2963 ecb.outf = xdiff_outf;
2964 ecb.priv = &data;
2965 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2966 }
2967
2968 SHA1_Final(sha1, &ctx);
2969 return 0;
2970 }
2971
2972 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2973 {
2974 struct diff_queue_struct *q = &diff_queued_diff;
2975 int i;
2976 int result = diff_get_patch_id(options, sha1);
2977
2978 for (i = 0; i < q->nr; i++)
2979 diff_free_filepair(q->queue[i]);
2980
2981 free(q->queue);
2982 q->queue = NULL;
2983 q->nr = q->alloc = 0;
2984
2985 return result;
2986 }
2987
2988 static int is_summary_empty(const struct diff_queue_struct *q)
2989 {
2990 int i;
2991
2992 for (i = 0; i < q->nr; i++) {
2993 const struct diff_filepair *p = q->queue[i];
2994
2995 switch (p->status) {
2996 case DIFF_STATUS_DELETED:
2997 case DIFF_STATUS_ADDED:
2998 case DIFF_STATUS_COPIED:
2999 case DIFF_STATUS_RENAMED:
3000 return 0;
3001 default:
3002 if (p->score)
3003 return 0;
3004 if (p->one->mode && p->two->mode &&
3005 p->one->mode != p->two->mode)
3006 return 0;
3007 break;
3008 }
3009 }
3010 return 1;
3011 }
3012
3013 void diff_flush(struct diff_options *options)
3014 {
3015 struct diff_queue_struct *q = &diff_queued_diff;
3016 int i, output_format = options->output_format;
3017 int separator = 0;
3018
3019 /*
3020 * Order: raw, stat, summary, patch
3021 * or: name/name-status/checkdiff (other bits clear)
3022 */
3023 if (!q->nr)
3024 goto free_queue;
3025
3026 if (output_format & (DIFF_FORMAT_RAW |
3027 DIFF_FORMAT_NAME |
3028 DIFF_FORMAT_NAME_STATUS |
3029 DIFF_FORMAT_CHECKDIFF)) {
3030 for (i = 0; i < q->nr; i++) {
3031 struct diff_filepair *p = q->queue[i];
3032 if (check_pair_status(p))
3033 flush_one_pair(p, options);
3034 }
3035 separator++;
3036 }
3037
3038 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3039 struct diffstat_t diffstat;
3040
3041 memset(&diffstat, 0, sizeof(struct diffstat_t));
3042 diffstat.xm.consume = diffstat_consume;
3043 for (i = 0; i < q->nr; i++) {
3044 struct diff_filepair *p = q->queue[i];
3045 if (check_pair_status(p))
3046 diff_flush_stat(p, options, &diffstat);
3047 }
3048 if (output_format & DIFF_FORMAT_NUMSTAT)
3049 show_numstat(&diffstat, options);
3050 if (output_format & DIFF_FORMAT_DIFFSTAT)
3051 show_stats(&diffstat, options);
3052 else if (output_format & DIFF_FORMAT_SHORTSTAT)
3053 show_shortstats(&diffstat);
3054 separator++;
3055 }
3056
3057 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3058 for (i = 0; i < q->nr; i++)
3059 diff_summary(q->queue[i]);
3060 separator++;
3061 }
3062
3063 if (output_format & DIFF_FORMAT_PATCH) {
3064 if (separator) {
3065 if (options->stat_sep) {
3066 /* attach patch instead of inline */
3067 fputs(options->stat_sep, stdout);
3068 } else {
3069 putchar(options->line_termination);
3070 }
3071 }
3072
3073 for (i = 0; i < q->nr; i++) {
3074 struct diff_filepair *p = q->queue[i];
3075 if (check_pair_status(p))
3076 diff_flush_patch(p, options);
3077 }
3078 }
3079
3080 if (output_format & DIFF_FORMAT_CALLBACK)
3081 options->format_callback(q, options, options->format_callback_data);
3082
3083 for (i = 0; i < q->nr; i++)
3084 diff_free_filepair(q->queue[i]);
3085 free_queue:
3086 free(q->queue);
3087 q->queue = NULL;
3088 q->nr = q->alloc = 0;
3089 }
3090
3091 static void diffcore_apply_filter(const char *filter)
3092 {
3093 int i;
3094 struct diff_queue_struct *q = &diff_queued_diff;
3095 struct diff_queue_struct outq;
3096 outq.queue = NULL;
3097 outq.nr = outq.alloc = 0;
3098
3099 if (!filter)
3100 return;
3101
3102 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3103 int found;
3104 for (i = found = 0; !found && i < q->nr; i++) {
3105 struct diff_filepair *p = q->queue[i];
3106 if (((p->status == DIFF_STATUS_MODIFIED) &&
3107 ((p->score &&
3108 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3109 (!p->score &&
3110 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3111 ((p->status != DIFF_STATUS_MODIFIED) &&
3112 strchr(filter, p->status)))
3113 found++;
3114 }
3115 if (found)
3116 return;
3117
3118 /* otherwise we will clear the whole queue
3119 * by copying the empty outq at the end of this
3120 * function, but first clear the current entries
3121 * in the queue.
3122 */
3123 for (i = 0; i < q->nr; i++)
3124 diff_free_filepair(q->queue[i]);
3125 }
3126 else {
3127 /* Only the matching ones */
3128 for (i = 0; i < q->nr; i++) {
3129 struct diff_filepair *p = q->queue[i];
3130
3131 if (((p->status == DIFF_STATUS_MODIFIED) &&
3132 ((p->score &&
3133 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3134 (!p->score &&
3135 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3136 ((p->status != DIFF_STATUS_MODIFIED) &&
3137 strchr(filter, p->status)))
3138 diff_q(&outq, p);
3139 else
3140 diff_free_filepair(p);
3141 }
3142 }
3143 free(q->queue);
3144 *q = outq;
3145 }
3146
3147 /* Check whether two filespecs with the same mode and size are identical */
3148 static int diff_filespec_is_identical(struct diff_filespec *one,
3149 struct diff_filespec *two)
3150 {
3151 if (S_ISGITLINK(one->mode)) {
3152 diff_fill_sha1_info(one);
3153 diff_fill_sha1_info(two);
3154 return !hashcmp(one->sha1, two->sha1);
3155 }
3156 if (diff_populate_filespec(one, 0))
3157 return 0;
3158 if (diff_populate_filespec(two, 0))
3159 return 0;
3160 return !memcmp(one->data, two->data, one->size);
3161 }
3162
3163 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3164 {
3165 int i;
3166 struct diff_queue_struct *q = &diff_queued_diff;
3167 struct diff_queue_struct outq;
3168 outq.queue = NULL;
3169 outq.nr = outq.alloc = 0;
3170
3171 for (i = 0; i < q->nr; i++) {
3172 struct diff_filepair *p = q->queue[i];
3173
3174 /*
3175 * 1. Entries that come from stat info dirtyness
3176 * always have both sides (iow, not create/delete),
3177 * one side of the object name is unknown, with
3178 * the same mode and size. Keep the ones that
3179 * do not match these criteria. They have real
3180 * differences.
3181 *
3182 * 2. At this point, the file is known to be modified,
3183 * with the same mode and size, and the object
3184 * name of one side is unknown. Need to inspect
3185 * the identical contents.
3186 */
3187 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3188 !DIFF_FILE_VALID(p->two) ||
3189 (p->one->sha1_valid && p->two->sha1_valid) ||
3190 (p->one->mode != p->two->mode) ||
3191 diff_populate_filespec(p->one, 1) ||
3192 diff_populate_filespec(p->two, 1) ||
3193 (p->one->size != p->two->size) ||
3194 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3195 diff_q(&outq, p);
3196 else {
3197 /*
3198 * The caller can subtract 1 from skip_stat_unmatch
3199 * to determine how many paths were dirty only
3200 * due to stat info mismatch.
3201 */
3202 if (!diffopt->no_index)
3203 diffopt->skip_stat_unmatch++;
3204 diff_free_filepair(p);
3205 }
3206 }
3207 free(q->queue);
3208 *q = outq;
3209 }
3210
3211 void diffcore_std(struct diff_options *options)
3212 {
3213 if (options->quiet)
3214 return;
3215
3216 if (options->skip_stat_unmatch && !options->find_copies_harder)
3217 diffcore_skip_stat_unmatch(options);
3218 if (options->break_opt != -1)
3219 diffcore_break(options->break_opt);
3220 if (options->detect_rename)
3221 diffcore_rename(options);
3222 if (options->break_opt != -1)
3223 diffcore_merge_broken();
3224 if (options->pickaxe)
3225 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3226 if (options->orderfile)
3227 diffcore_order(options->orderfile);
3228 diff_resolve_rename_copy();
3229 diffcore_apply_filter(options->filter);
3230
3231 options->has_changes = !!diff_queued_diff.nr;
3232 }
3233
3234
3235 void diff_addremove(struct diff_options *options,
3236 int addremove, unsigned mode,
3237 const unsigned char *sha1,
3238 const char *base, const char *path)
3239 {
3240 char concatpath[PATH_MAX];
3241 struct diff_filespec *one, *two;
3242
3243 /* This may look odd, but it is a preparation for
3244 * feeding "there are unchanged files which should
3245 * not produce diffs, but when you are doing copy
3246 * detection you would need them, so here they are"
3247 * entries to the diff-core. They will be prefixed
3248 * with something like '=' or '*' (I haven't decided
3249 * which but should not make any difference).
3250 * Feeding the same new and old to diff_change()
3251 * also has the same effect.
3252 * Before the final output happens, they are pruned after
3253 * merged into rename/copy pairs as appropriate.
3254 */
3255 if (options->reverse_diff)
3256 addremove = (addremove == '+' ? '-' :
3257 addremove == '-' ? '+' : addremove);
3258
3259 if (!path) path = "";
3260 sprintf(concatpath, "%s%s", base, path);
3261 one = alloc_filespec(concatpath);
3262 two = alloc_filespec(concatpath);
3263
3264 if (addremove != '+')
3265 fill_filespec(one, sha1, mode);
3266 if (addremove != '-')
3267 fill_filespec(two, sha1, mode);
3268
3269 diff_queue(&diff_queued_diff, one, two);
3270 options->has_changes = 1;
3271 }
3272
3273 void diff_change(struct diff_options *options,
3274 unsigned old_mode, unsigned new_mode,
3275 const unsigned char *old_sha1,
3276 const unsigned char *new_sha1,
3277 const char *base, const char *path)
3278 {
3279 char concatpath[PATH_MAX];
3280 struct diff_filespec *one, *two;
3281
3282 if (options->reverse_diff) {
3283 unsigned tmp;
3284 const unsigned char *tmp_c;
3285 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3286 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3287 }
3288 if (!path) path = "";
3289 sprintf(concatpath, "%s%s", base, path);
3290 one = alloc_filespec(concatpath);
3291 two = alloc_filespec(concatpath);
3292 fill_filespec(one, old_sha1, old_mode);
3293 fill_filespec(two, new_sha1, new_mode);
3294
3295 diff_queue(&diff_queued_diff, one, two);
3296 options->has_changes = 1;
3297 }
3298
3299 void diff_unmerge(struct diff_options *options,
3300 const char *path,
3301 unsigned mode, const unsigned char *sha1)
3302 {
3303 struct diff_filespec *one, *two;
3304 one = alloc_filespec(path);
3305 two = alloc_filespec(path);
3306 fill_filespec(one, sha1, mode);
3307 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3308 }
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