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nfv?asprintf are broken without va_copy, workaround them.
[git/dscho.git] / diff.c
blob2216d756d1f351cf51eb4bca07c0cd5e0497b619
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12
13 #ifdef NO_FAST_WORKING_DIRECTORY
14 #define FAST_WORKING_DIRECTORY 0
15 #else
16 #define FAST_WORKING_DIRECTORY 1
17 #endif
18
19 static int diff_detect_rename_default;
20 static int diff_rename_limit_default = 100;
21 static int diff_use_color_default;
22 int diff_auto_refresh_index = 1;
23
24 static char diff_colors[][COLOR_MAXLEN] = {
25 "\033[m", /* reset */
26 "", /* PLAIN (normal) */
27 "\033[1m", /* METAINFO (bold) */
28 "\033[36m", /* FRAGINFO (cyan) */
29 "\033[31m", /* OLD (red) */
30 "\033[32m", /* NEW (green) */
31 "\033[33m", /* COMMIT (yellow) */
32 "\033[41m", /* WHITESPACE (red background) */
33 };
34
35 static int parse_diff_color_slot(const char *var, int ofs)
36 {
37 if (!strcasecmp(var+ofs, "plain"))
38 return DIFF_PLAIN;
39 if (!strcasecmp(var+ofs, "meta"))
40 return DIFF_METAINFO;
41 if (!strcasecmp(var+ofs, "frag"))
42 return DIFF_FRAGINFO;
43 if (!strcasecmp(var+ofs, "old"))
44 return DIFF_FILE_OLD;
45 if (!strcasecmp(var+ofs, "new"))
46 return DIFF_FILE_NEW;
47 if (!strcasecmp(var+ofs, "commit"))
48 return DIFF_COMMIT;
49 if (!strcasecmp(var+ofs, "whitespace"))
50 return DIFF_WHITESPACE;
51 die("bad config variable '%s'", var);
52 }
53
54 static struct ll_diff_driver {
55 const char *name;
56 struct ll_diff_driver *next;
57 char *cmd;
58 } *user_diff, **user_diff_tail;
59
60 static void read_config_if_needed(void)
61 {
62 if (!user_diff_tail) {
63 user_diff_tail = &user_diff;
64 git_config(git_diff_ui_config);
65 }
66 }
67
68 /*
69 * Currently there is only "diff.<drivername>.command" variable;
70 * because there are "diff.color.<slot>" variables, we are parsing
71 * this in a bit convoluted way to allow low level diff driver
72 * called "color".
73 */
74 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
75 {
76 const char *name;
77 int namelen;
78 struct ll_diff_driver *drv;
79
80 name = var + 5;
81 namelen = ep - name;
82 for (drv = user_diff; drv; drv = drv->next)
83 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
84 break;
85 if (!drv) {
86 drv = xcalloc(1, sizeof(struct ll_diff_driver));
87 drv->name = xmemdupz(name, namelen);
88 if (!user_diff_tail)
89 user_diff_tail = &user_diff;
90 *user_diff_tail = drv;
91 user_diff_tail = &(drv->next);
92 }
93
94 if (!value)
95 return error("%s: lacks value", var);
96 drv->cmd = strdup(value);
97 return 0;
98 }
99
100 /*
101 * 'diff.<what>.funcname' attribute can be specified in the configuration
102 * to define a customized regexp to find the beginning of a function to
103 * be used for hunk header lines of "diff -p" style output.
104 */
105 static struct funcname_pattern {
106 char *name;
107 char *pattern;
108 struct funcname_pattern *next;
109 } *funcname_pattern_list;
110
111 static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
112 {
113 const char *name;
114 int namelen;
115 struct funcname_pattern *pp;
116
117 name = var + 5; /* "diff." */
118 namelen = ep - name;
119
120 for (pp = funcname_pattern_list; pp; pp = pp->next)
121 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
122 break;
123 if (!pp) {
124 pp = xcalloc(1, sizeof(*pp));
125 pp->name = xmemdupz(name, namelen);
126 pp->next = funcname_pattern_list;
127 funcname_pattern_list = pp;
128 }
129 if (pp->pattern)
130 free(pp->pattern);
131 pp->pattern = xstrdup(value);
132 return 0;
133 }
134
135 /*
136 * These are to give UI layer defaults.
137 * The core-level commands such as git-diff-files should
138 * never be affected by the setting of diff.renames
139 * the user happens to have in the configuration file.
140 */
141 int git_diff_ui_config(const char *var, const char *value)
142 {
143 if (!strcmp(var, "diff.renamelimit")) {
144 diff_rename_limit_default = git_config_int(var, value);
145 return 0;
146 }
147 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
148 diff_use_color_default = git_config_colorbool(var, value);
149 return 0;
150 }
151 if (!strcmp(var, "diff.renames")) {
152 if (!value)
153 diff_detect_rename_default = DIFF_DETECT_RENAME;
154 else if (!strcasecmp(value, "copies") ||
155 !strcasecmp(value, "copy"))
156 diff_detect_rename_default = DIFF_DETECT_COPY;
157 else if (git_config_bool(var,value))
158 diff_detect_rename_default = DIFF_DETECT_RENAME;
159 return 0;
160 }
161 if (!strcmp(var, "diff.autorefreshindex")) {
162 diff_auto_refresh_index = git_config_bool(var, value);
163 return 0;
164 }
165 if (!prefixcmp(var, "diff.")) {
166 const char *ep = strrchr(var, '.');
167
168 if (ep != var + 4) {
169 if (!strcmp(ep, ".command"))
170 return parse_lldiff_command(var, ep, value);
171 if (!strcmp(ep, ".funcname"))
172 return parse_funcname_pattern(var, ep, value);
173 }
174 }
175 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
176 int slot = parse_diff_color_slot(var, 11);
177 color_parse(value, var, diff_colors[slot]);
178 return 0;
179 }
180
181 return git_default_config(var, value);
182 }
183
184 static char *quote_one(const char *str)
185 {
186 int needlen;
187 char *xp;
188
189 if (!str)
190 return NULL;
191 needlen = quote_c_style(str, NULL, NULL, 0);
192 if (!needlen)
193 return xstrdup(str);
194 xp = xmalloc(needlen + 1);
195 quote_c_style(str, xp, NULL, 0);
196 return xp;
197 }
198
199 static char *quote_two(const char *one, const char *two)
200 {
201 int need_one = quote_c_style(one, NULL, NULL, 1);
202 int need_two = quote_c_style(two, NULL, NULL, 1);
203 char *xp;
204
205 if (need_one + need_two) {
206 if (!need_one) need_one = strlen(one);
207 if (!need_two) need_one = strlen(two);
208
209 xp = xmalloc(need_one + need_two + 3);
210 xp[0] = '"';
211 quote_c_style(one, xp + 1, NULL, 1);
212 quote_c_style(two, xp + need_one + 1, NULL, 1);
213 strcpy(xp + need_one + need_two + 1, "\"");
214 return xp;
215 }
216 need_one = strlen(one);
217 need_two = strlen(two);
218 xp = xmalloc(need_one + need_two + 1);
219 strcpy(xp, one);
220 strcpy(xp + need_one, two);
221 return xp;
222 }
223
224 static const char *external_diff(void)
225 {
226 static const char *external_diff_cmd = NULL;
227 static int done_preparing = 0;
228
229 if (done_preparing)
230 return external_diff_cmd;
231 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
232 done_preparing = 1;
233 return external_diff_cmd;
234 }
235
236 static struct diff_tempfile {
237 const char *name; /* filename external diff should read from */
238 char hex[41];
239 char mode[10];
240 char tmp_path[PATH_MAX];
241 } diff_temp[2];
242
243 static int count_lines(const char *data, int size)
244 {
245 int count, ch, completely_empty = 1, nl_just_seen = 0;
246 count = 0;
247 while (0 < size--) {
248 ch = *data++;
249 if (ch == '\n') {
250 count++;
251 nl_just_seen = 1;
252 completely_empty = 0;
253 }
254 else {
255 nl_just_seen = 0;
256 completely_empty = 0;
257 }
258 }
259 if (completely_empty)
260 return 0;
261 if (!nl_just_seen)
262 count++; /* no trailing newline */
263 return count;
264 }
265
266 static void print_line_count(int count)
267 {
268 switch (count) {
269 case 0:
270 printf("0,0");
271 break;
272 case 1:
273 printf("1");
274 break;
275 default:
276 printf("1,%d", count);
277 break;
278 }
279 }
280
281 static void copy_file(int prefix, const char *data, int size,
282 const char *set, const char *reset)
283 {
284 int ch, nl_just_seen = 1;
285 while (0 < size--) {
286 ch = *data++;
287 if (nl_just_seen) {
288 fputs(set, stdout);
289 putchar(prefix);
290 }
291 if (ch == '\n') {
292 nl_just_seen = 1;
293 fputs(reset, stdout);
294 } else
295 nl_just_seen = 0;
296 putchar(ch);
297 }
298 if (!nl_just_seen)
299 printf("%s\n\\ No newline at end of file\n", reset);
300 }
301
302 static void emit_rewrite_diff(const char *name_a,
303 const char *name_b,
304 struct diff_filespec *one,
305 struct diff_filespec *two,
306 int color_diff)
307 {
308 int lc_a, lc_b;
309 const char *name_a_tab, *name_b_tab;
310 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
311 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
312 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
313 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
314 const char *reset = diff_get_color(color_diff, DIFF_RESET);
315
316 name_a += (*name_a == '/');
317 name_b += (*name_b == '/');
318 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
319 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
320
321 diff_populate_filespec(one, 0);
322 diff_populate_filespec(two, 0);
323 lc_a = count_lines(one->data, one->size);
324 lc_b = count_lines(two->data, two->size);
325 printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
326 metainfo, name_a, name_a_tab, reset,
327 metainfo, name_b, name_b_tab, reset, fraginfo);
328 print_line_count(lc_a);
329 printf(" +");
330 print_line_count(lc_b);
331 printf(" @@%s\n", reset);
332 if (lc_a)
333 copy_file('-', one->data, one->size, old, reset);
334 if (lc_b)
335 copy_file('+', two->data, two->size, new, reset);
336 }
337
338 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
339 {
340 if (!DIFF_FILE_VALID(one)) {
341 mf->ptr = (char *)""; /* does not matter */
342 mf->size = 0;
343 return 0;
344 }
345 else if (diff_populate_filespec(one, 0))
346 return -1;
347 mf->ptr = one->data;
348 mf->size = one->size;
349 return 0;
350 }
351
352 struct diff_words_buffer {
353 mmfile_t text;
354 long alloc;
355 long current; /* output pointer */
356 int suppressed_newline;
357 };
358
359 static void diff_words_append(char *line, unsigned long len,
360 struct diff_words_buffer *buffer)
361 {
362 if (buffer->text.size + len > buffer->alloc) {
363 buffer->alloc = (buffer->text.size + len) * 3 / 2;
364 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
365 }
366 line++;
367 len--;
368 memcpy(buffer->text.ptr + buffer->text.size, line, len);
369 buffer->text.size += len;
370 }
371
372 struct diff_words_data {
373 struct xdiff_emit_state xm;
374 struct diff_words_buffer minus, plus;
375 };
376
377 static void print_word(struct diff_words_buffer *buffer, int len, int color,
378 int suppress_newline)
379 {
380 const char *ptr;
381 int eol = 0;
382
383 if (len == 0)
384 return;
385
386 ptr = buffer->text.ptr + buffer->current;
387 buffer->current += len;
388
389 if (ptr[len - 1] == '\n') {
390 eol = 1;
391 len--;
392 }
393
394 fputs(diff_get_color(1, color), stdout);
395 fwrite(ptr, len, 1, stdout);
396 fputs(diff_get_color(1, DIFF_RESET), stdout);
397
398 if (eol) {
399 if (suppress_newline)
400 buffer->suppressed_newline = 1;
401 else
402 putchar('\n');
403 }
404 }
405
406 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
407 {
408 struct diff_words_data *diff_words = priv;
409
410 if (diff_words->minus.suppressed_newline) {
411 if (line[0] != '+')
412 putchar('\n');
413 diff_words->minus.suppressed_newline = 0;
414 }
415
416 len--;
417 switch (line[0]) {
418 case '-':
419 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
420 break;
421 case '+':
422 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
423 break;
424 case ' ':
425 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
426 diff_words->minus.current += len;
427 break;
428 }
429 }
430
431 /* this executes the word diff on the accumulated buffers */
432 static void diff_words_show(struct diff_words_data *diff_words)
433 {
434 xpparam_t xpp;
435 xdemitconf_t xecfg;
436 xdemitcb_t ecb;
437 mmfile_t minus, plus;
438 int i;
439
440 memset(&xecfg, 0, sizeof(xecfg));
441 minus.size = diff_words->minus.text.size;
442 minus.ptr = xmalloc(minus.size);
443 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
444 for (i = 0; i < minus.size; i++)
445 if (isspace(minus.ptr[i]))
446 minus.ptr[i] = '\n';
447 diff_words->minus.current = 0;
448
449 plus.size = diff_words->plus.text.size;
450 plus.ptr = xmalloc(plus.size);
451 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
452 for (i = 0; i < plus.size; i++)
453 if (isspace(plus.ptr[i]))
454 plus.ptr[i] = '\n';
455 diff_words->plus.current = 0;
456
457 xpp.flags = XDF_NEED_MINIMAL;
458 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
459 ecb.outf = xdiff_outf;
460 ecb.priv = diff_words;
461 diff_words->xm.consume = fn_out_diff_words_aux;
462 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
463
464 free(minus.ptr);
465 free(plus.ptr);
466 diff_words->minus.text.size = diff_words->plus.text.size = 0;
467
468 if (diff_words->minus.suppressed_newline) {
469 putchar('\n');
470 diff_words->minus.suppressed_newline = 0;
471 }
472 }
473
474 struct emit_callback {
475 struct xdiff_emit_state xm;
476 int nparents, color_diff;
477 const char **label_path;
478 struct diff_words_data *diff_words;
479 int *found_changesp;
480 };
481
482 static void free_diff_words_data(struct emit_callback *ecbdata)
483 {
484 if (ecbdata->diff_words) {
485 /* flush buffers */
486 if (ecbdata->diff_words->minus.text.size ||
487 ecbdata->diff_words->plus.text.size)
488 diff_words_show(ecbdata->diff_words);
489
490 if (ecbdata->diff_words->minus.text.ptr)
491 free (ecbdata->diff_words->minus.text.ptr);
492 if (ecbdata->diff_words->plus.text.ptr)
493 free (ecbdata->diff_words->plus.text.ptr);
494 free(ecbdata->diff_words);
495 ecbdata->diff_words = NULL;
496 }
497 }
498
499 const char *diff_get_color(int diff_use_color, enum color_diff ix)
500 {
501 if (diff_use_color)
502 return diff_colors[ix];
503 return "";
504 }
505
506 static void emit_line(const char *set, const char *reset, const char *line, int len)
507 {
508 if (len > 0 && line[len-1] == '\n')
509 len--;
510 fputs(set, stdout);
511 fwrite(line, len, 1, stdout);
512 puts(reset);
513 }
514
515 static void emit_line_with_ws(int nparents,
516 const char *set, const char *reset, const char *ws,
517 const char *line, int len)
518 {
519 int col0 = nparents;
520 int last_tab_in_indent = -1;
521 int last_space_in_indent = -1;
522 int i;
523 int tail = len;
524 int need_highlight_leading_space = 0;
525 /* The line is a newly added line. Does it have funny leading
526 * whitespaces? In indent, SP should never precede a TAB.
527 */
528 for (i = col0; i < len; i++) {
529 if (line[i] == '\t') {
530 last_tab_in_indent = i;
531 if (0 <= last_space_in_indent)
532 need_highlight_leading_space = 1;
533 }
534 else if (line[i] == ' ')
535 last_space_in_indent = i;
536 else
537 break;
538 }
539 fputs(set, stdout);
540 fwrite(line, col0, 1, stdout);
541 fputs(reset, stdout);
542 if (((i == len) || line[i] == '\n') && i != col0) {
543 /* The whole line was indent */
544 emit_line(ws, reset, line + col0, len - col0);
545 return;
546 }
547 i = col0;
548 if (need_highlight_leading_space) {
549 while (i < last_tab_in_indent) {
550 if (line[i] == ' ') {
551 fputs(ws, stdout);
552 putchar(' ');
553 fputs(reset, stdout);
554 }
555 else
556 putchar(line[i]);
557 i++;
558 }
559 }
560 tail = len - 1;
561 if (line[tail] == '\n' && i < tail)
562 tail--;
563 while (i < tail) {
564 if (!isspace(line[tail]))
565 break;
566 tail--;
567 }
568 if ((i < tail && line[tail + 1] != '\n')) {
569 /* This has whitespace between tail+1..len */
570 fputs(set, stdout);
571 fwrite(line + i, tail - i + 1, 1, stdout);
572 fputs(reset, stdout);
573 emit_line(ws, reset, line + tail + 1, len - tail - 1);
574 }
575 else
576 emit_line(set, reset, line + i, len - i);
577 }
578
579 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
580 {
581 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
582 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
583
584 if (!*ws)
585 emit_line(set, reset, line, len);
586 else
587 emit_line_with_ws(ecbdata->nparents, set, reset, ws,
588 line, len);
589 }
590
591 static void fn_out_consume(void *priv, char *line, unsigned long len)
592 {
593 int i;
594 int color;
595 struct emit_callback *ecbdata = priv;
596 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
597 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
598
599 *(ecbdata->found_changesp) = 1;
600
601 if (ecbdata->label_path[0]) {
602 const char *name_a_tab, *name_b_tab;
603
604 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
605 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
606
607 printf("%s--- %s%s%s\n",
608 set, ecbdata->label_path[0], reset, name_a_tab);
609 printf("%s+++ %s%s%s\n",
610 set, ecbdata->label_path[1], reset, name_b_tab);
611 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
612 }
613
614 /* This is not really necessary for now because
615 * this codepath only deals with two-way diffs.
616 */
617 for (i = 0; i < len && line[i] == '@'; i++)
618 ;
619 if (2 <= i && i < len && line[i] == ' ') {
620 ecbdata->nparents = i - 1;
621 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
622 reset, line, len);
623 return;
624 }
625
626 if (len < ecbdata->nparents) {
627 set = reset;
628 emit_line(reset, reset, line, len);
629 return;
630 }
631
632 color = DIFF_PLAIN;
633 if (ecbdata->diff_words && ecbdata->nparents != 1)
634 /* fall back to normal diff */
635 free_diff_words_data(ecbdata);
636 if (ecbdata->diff_words) {
637 if (line[0] == '-') {
638 diff_words_append(line, len,
639 &ecbdata->diff_words->minus);
640 return;
641 } else if (line[0] == '+') {
642 diff_words_append(line, len,
643 &ecbdata->diff_words->plus);
644 return;
645 }
646 if (ecbdata->diff_words->minus.text.size ||
647 ecbdata->diff_words->plus.text.size)
648 diff_words_show(ecbdata->diff_words);
649 line++;
650 len--;
651 emit_line(set, reset, line, len);
652 return;
653 }
654 for (i = 0; i < ecbdata->nparents && len; i++) {
655 if (line[i] == '-')
656 color = DIFF_FILE_OLD;
657 else if (line[i] == '+')
658 color = DIFF_FILE_NEW;
659 }
660
661 if (color != DIFF_FILE_NEW) {
662 emit_line(diff_get_color(ecbdata->color_diff, color),
663 reset, line, len);
664 return;
665 }
666 emit_add_line(reset, ecbdata, line, len);
667 }
668
669 static char *pprint_rename(const char *a, const char *b)
670 {
671 const char *old = a;
672 const char *new = b;
673 char *name = NULL;
674 int pfx_length, sfx_length;
675 int len_a = strlen(a);
676 int len_b = strlen(b);
677 int qlen_a = quote_c_style(a, NULL, NULL, 0);
678 int qlen_b = quote_c_style(b, NULL, NULL, 0);
679
680 if (qlen_a || qlen_b) {
681 if (qlen_a) len_a = qlen_a;
682 if (qlen_b) len_b = qlen_b;
683 name = xmalloc( len_a + len_b + 5 );
684 if (qlen_a)
685 quote_c_style(a, name, NULL, 0);
686 else
687 memcpy(name, a, len_a);
688 memcpy(name + len_a, " => ", 4);
689 if (qlen_b)
690 quote_c_style(b, name + len_a + 4, NULL, 0);
691 else
692 memcpy(name + len_a + 4, b, len_b + 1);
693 return name;
694 }
695
696 /* Find common prefix */
697 pfx_length = 0;
698 while (*old && *new && *old == *new) {
699 if (*old == '/')
700 pfx_length = old - a + 1;
701 old++;
702 new++;
703 }
704
705 /* Find common suffix */
706 old = a + len_a;
707 new = b + len_b;
708 sfx_length = 0;
709 while (a <= old && b <= new && *old == *new) {
710 if (*old == '/')
711 sfx_length = len_a - (old - a);
712 old--;
713 new--;
714 }
715
716 /*
717 * pfx{mid-a => mid-b}sfx
718 * {pfx-a => pfx-b}sfx
719 * pfx{sfx-a => sfx-b}
720 * name-a => name-b
721 */
722 if (pfx_length + sfx_length) {
723 int a_midlen = len_a - pfx_length - sfx_length;
724 int b_midlen = len_b - pfx_length - sfx_length;
725 if (a_midlen < 0) a_midlen = 0;
726 if (b_midlen < 0) b_midlen = 0;
727
728 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
729 sprintf(name, "%.*s{%.*s => %.*s}%s",
730 pfx_length, a,
731 a_midlen, a + pfx_length,
732 b_midlen, b + pfx_length,
733 a + len_a - sfx_length);
734 }
735 else {
736 name = xmalloc(len_a + len_b + 5);
737 sprintf(name, "%s => %s", a, b);
738 }
739 return name;
740 }
741
742 struct diffstat_t {
743 struct xdiff_emit_state xm;
744
745 int nr;
746 int alloc;
747 struct diffstat_file {
748 char *name;
749 unsigned is_unmerged:1;
750 unsigned is_binary:1;
751 unsigned is_renamed:1;
752 unsigned int added, deleted;
753 } **files;
754 };
755
756 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
757 const char *name_a,
758 const char *name_b)
759 {
760 struct diffstat_file *x;
761 x = xcalloc(sizeof (*x), 1);
762 if (diffstat->nr == diffstat->alloc) {
763 diffstat->alloc = alloc_nr(diffstat->alloc);
764 diffstat->files = xrealloc(diffstat->files,
765 diffstat->alloc * sizeof(x));
766 }
767 diffstat->files[diffstat->nr++] = x;
768 if (name_b) {
769 x->name = pprint_rename(name_a, name_b);
770 x->is_renamed = 1;
771 }
772 else
773 x->name = xstrdup(name_a);
774 return x;
775 }
776
777 static void diffstat_consume(void *priv, char *line, unsigned long len)
778 {
779 struct diffstat_t *diffstat = priv;
780 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
781
782 if (line[0] == '+')
783 x->added++;
784 else if (line[0] == '-')
785 x->deleted++;
786 }
787
788 const char mime_boundary_leader[] = "------------";
789
790 static int scale_linear(int it, int width, int max_change)
791 {
792 /*
793 * make sure that at least one '-' is printed if there were deletions,
794 * and likewise for '+'.
795 */
796 if (max_change < 2)
797 return it;
798 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
799 }
800
801 static void show_name(const char *prefix, const char *name, int len,
802 const char *reset, const char *set)
803 {
804 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
805 }
806
807 static void show_graph(char ch, int cnt, const char *set, const char *reset)
808 {
809 if (cnt <= 0)
810 return;
811 printf("%s", set);
812 while (cnt--)
813 putchar(ch);
814 printf("%s", reset);
815 }
816
817 static void show_stats(struct diffstat_t* data, struct diff_options *options)
818 {
819 int i, len, add, del, total, adds = 0, dels = 0;
820 int max_change = 0, max_len = 0;
821 int total_files = data->nr;
822 int width, name_width;
823 const char *reset, *set, *add_c, *del_c;
824
825 if (data->nr == 0)
826 return;
827
828 width = options->stat_width ? options->stat_width : 80;
829 name_width = options->stat_name_width ? options->stat_name_width : 50;
830
831 /* Sanity: give at least 5 columns to the graph,
832 * but leave at least 10 columns for the name.
833 */
834 if (width < name_width + 15) {
835 if (name_width <= 25)
836 width = name_width + 15;
837 else
838 name_width = width - 15;
839 }
840
841 /* Find the longest filename and max number of changes */
842 reset = diff_get_color(options->color_diff, DIFF_RESET);
843 set = diff_get_color(options->color_diff, DIFF_PLAIN);
844 add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
845 del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
846
847 for (i = 0; i < data->nr; i++) {
848 struct diffstat_file *file = data->files[i];
849 int change = file->added + file->deleted;
850
851 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
852 len = quote_c_style(file->name, NULL, NULL, 0);
853 if (len) {
854 char *qname = xmalloc(len + 1);
855 quote_c_style(file->name, qname, NULL, 0);
856 free(file->name);
857 file->name = qname;
858 }
859 }
860
861 len = strlen(file->name);
862 if (max_len < len)
863 max_len = len;
864
865 if (file->is_binary || file->is_unmerged)
866 continue;
867 if (max_change < change)
868 max_change = change;
869 }
870
871 /* Compute the width of the graph part;
872 * 10 is for one blank at the beginning of the line plus
873 * " | count " between the name and the graph.
874 *
875 * From here on, name_width is the width of the name area,
876 * and width is the width of the graph area.
877 */
878 name_width = (name_width < max_len) ? name_width : max_len;
879 if (width < (name_width + 10) + max_change)
880 width = width - (name_width + 10);
881 else
882 width = max_change;
883
884 for (i = 0; i < data->nr; i++) {
885 const char *prefix = "";
886 char *name = data->files[i]->name;
887 int added = data->files[i]->added;
888 int deleted = data->files[i]->deleted;
889 int name_len;
890
891 /*
892 * "scale" the filename
893 */
894 len = name_width;
895 name_len = strlen(name);
896 if (name_width < name_len) {
897 char *slash;
898 prefix = "...";
899 len -= 3;
900 name += name_len - len;
901 slash = strchr(name, '/');
902 if (slash)
903 name = slash;
904 }
905
906 if (data->files[i]->is_binary) {
907 show_name(prefix, name, len, reset, set);
908 printf(" Bin ");
909 printf("%s%d%s", del_c, deleted, reset);
910 printf(" -> ");
911 printf("%s%d%s", add_c, added, reset);
912 printf(" bytes");
913 printf("\n");
914 goto free_diffstat_file;
915 }
916 else if (data->files[i]->is_unmerged) {
917 show_name(prefix, name, len, reset, set);
918 printf(" Unmerged\n");
919 goto free_diffstat_file;
920 }
921 else if (!data->files[i]->is_renamed &&
922 (added + deleted == 0)) {
923 total_files--;
924 goto free_diffstat_file;
925 }
926
927 /*
928 * scale the add/delete
929 */
930 add = added;
931 del = deleted;
932 total = add + del;
933 adds += add;
934 dels += del;
935
936 if (width <= max_change) {
937 add = scale_linear(add, width, max_change);
938 del = scale_linear(del, width, max_change);
939 total = add + del;
940 }
941 show_name(prefix, name, len, reset, set);
942 printf("%5d ", added + deleted);
943 show_graph('+', add, add_c, reset);
944 show_graph('-', del, del_c, reset);
945 putchar('\n');
946 free_diffstat_file:
947 free(data->files[i]->name);
948 free(data->files[i]);
949 }
950 free(data->files);
951 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
952 set, total_files, adds, dels, reset);
953 }
954
955 static void show_shortstats(struct diffstat_t* data)
956 {
957 int i, adds = 0, dels = 0, total_files = data->nr;
958
959 if (data->nr == 0)
960 return;
961
962 for (i = 0; i < data->nr; i++) {
963 if (!data->files[i]->is_binary &&
964 !data->files[i]->is_unmerged) {
965 int added = data->files[i]->added;
966 int deleted= data->files[i]->deleted;
967 if (!data->files[i]->is_renamed &&
968 (added + deleted == 0)) {
969 total_files--;
970 } else {
971 adds += added;
972 dels += deleted;
973 }
974 }
975 free(data->files[i]->name);
976 free(data->files[i]);
977 }
978 free(data->files);
979
980 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
981 total_files, adds, dels);
982 }
983
984 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
985 {
986 int i;
987
988 for (i = 0; i < data->nr; i++) {
989 struct diffstat_file *file = data->files[i];
990
991 if (file->is_binary)
992 printf("-\t-\t");
993 else
994 printf("%d\t%d\t", file->added, file->deleted);
995 if (options->line_termination && !file->is_renamed &&
996 quote_c_style(file->name, NULL, NULL, 0))
997 quote_c_style(file->name, NULL, stdout, 0);
998 else
999 fputs(file->name, stdout);
1000 putchar(options->line_termination);
1001 }
1002 }
1003
1004 struct checkdiff_t {
1005 struct xdiff_emit_state xm;
1006 const char *filename;
1007 int lineno, color_diff;
1008 };
1009
1010 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1011 {
1012 struct checkdiff_t *data = priv;
1013 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
1014 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
1015 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
1016
1017 if (line[0] == '+') {
1018 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
1019
1020 /* check space before tab */
1021 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
1022 if (line[i] == ' ')
1023 spaces++;
1024 if (line[i - 1] == '\t' && spaces)
1025 space_before_tab = 1;
1026
1027 /* check white space at line end */
1028 if (line[len - 1] == '\n')
1029 len--;
1030 if (isspace(line[len - 1]))
1031 white_space_at_end = 1;
1032
1033 if (space_before_tab || white_space_at_end) {
1034 printf("%s:%d: %s", data->filename, data->lineno, ws);
1035 if (space_before_tab) {
1036 printf("space before tab");
1037 if (white_space_at_end)
1038 putchar(',');
1039 }
1040 if (white_space_at_end)
1041 printf("white space at end");
1042 printf(":%s ", reset);
1043 emit_line_with_ws(1, set, reset, ws, line, len);
1044 }
1045
1046 data->lineno++;
1047 } else if (line[0] == ' ')
1048 data->lineno++;
1049 else if (line[0] == '@') {
1050 char *plus = strchr(line, '+');
1051 if (plus)
1052 data->lineno = strtol(plus, NULL, 10);
1053 else
1054 die("invalid diff");
1055 }
1056 }
1057
1058 static unsigned char *deflate_it(char *data,
1059 unsigned long size,
1060 unsigned long *result_size)
1061 {
1062 int bound;
1063 unsigned char *deflated;
1064 z_stream stream;
1065
1066 memset(&stream, 0, sizeof(stream));
1067 deflateInit(&stream, zlib_compression_level);
1068 bound = deflateBound(&stream, size);
1069 deflated = xmalloc(bound);
1070 stream.next_out = deflated;
1071 stream.avail_out = bound;
1072
1073 stream.next_in = (unsigned char *)data;
1074 stream.avail_in = size;
1075 while (deflate(&stream, Z_FINISH) == Z_OK)
1076 ; /* nothing */
1077 deflateEnd(&stream);
1078 *result_size = stream.total_out;
1079 return deflated;
1080 }
1081
1082 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1083 {
1084 void *cp;
1085 void *delta;
1086 void *deflated;
1087 void *data;
1088 unsigned long orig_size;
1089 unsigned long delta_size;
1090 unsigned long deflate_size;
1091 unsigned long data_size;
1092
1093 /* We could do deflated delta, or we could do just deflated two,
1094 * whichever is smaller.
1095 */
1096 delta = NULL;
1097 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1098 if (one->size && two->size) {
1099 delta = diff_delta(one->ptr, one->size,
1100 two->ptr, two->size,
1101 &delta_size, deflate_size);
1102 if (delta) {
1103 void *to_free = delta;
1104 orig_size = delta_size;
1105 delta = deflate_it(delta, delta_size, &delta_size);
1106 free(to_free);
1107 }
1108 }
1109
1110 if (delta && delta_size < deflate_size) {
1111 printf("delta %lu\n", orig_size);
1112 free(deflated);
1113 data = delta;
1114 data_size = delta_size;
1115 }
1116 else {
1117 printf("literal %lu\n", two->size);
1118 free(delta);
1119 data = deflated;
1120 data_size = deflate_size;
1121 }
1122
1123 /* emit data encoded in base85 */
1124 cp = data;
1125 while (data_size) {
1126 int bytes = (52 < data_size) ? 52 : data_size;
1127 char line[70];
1128 data_size -= bytes;
1129 if (bytes <= 26)
1130 line[0] = bytes + 'A' - 1;
1131 else
1132 line[0] = bytes - 26 + 'a' - 1;
1133 encode_85(line + 1, cp, bytes);
1134 cp = (char *) cp + bytes;
1135 puts(line);
1136 }
1137 printf("\n");
1138 free(data);
1139 }
1140
1141 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1142 {
1143 printf("GIT binary patch\n");
1144 emit_binary_diff_body(one, two);
1145 emit_binary_diff_body(two, one);
1146 }
1147
1148 static void setup_diff_attr_check(struct git_attr_check *check)
1149 {
1150 static struct git_attr *attr_diff;
1151
1152 if (!attr_diff) {
1153 attr_diff = git_attr("diff", 4);
1154 }
1155 check[0].attr = attr_diff;
1156 }
1157
1158 static void diff_filespec_check_attr(struct diff_filespec *one)
1159 {
1160 struct git_attr_check attr_diff_check;
1161 int check_from_data = 0;
1162
1163 if (one->checked_attr)
1164 return;
1165
1166 setup_diff_attr_check(&attr_diff_check);
1167 one->is_binary = 0;
1168 one->funcname_pattern_ident = NULL;
1169
1170 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1171 const char *value;
1172
1173 /* binaryness */
1174 value = attr_diff_check.value;
1175 if (ATTR_TRUE(value))
1176 ;
1177 else if (ATTR_FALSE(value))
1178 one->is_binary = 1;
1179 else
1180 check_from_data = 1;
1181
1182 /* funcname pattern ident */
1183 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1184 ;
1185 else
1186 one->funcname_pattern_ident = value;
1187 }
1188
1189 if (check_from_data) {
1190 if (!one->data && DIFF_FILE_VALID(one))
1191 diff_populate_filespec(one, 0);
1192
1193 if (one->data)
1194 one->is_binary = buffer_is_binary(one->data, one->size);
1195 }
1196 }
1197
1198 int diff_filespec_is_binary(struct diff_filespec *one)
1199 {
1200 diff_filespec_check_attr(one);
1201 return one->is_binary;
1202 }
1203
1204 static const char *funcname_pattern(const char *ident)
1205 {
1206 struct funcname_pattern *pp;
1207
1208 read_config_if_needed();
1209 for (pp = funcname_pattern_list; pp; pp = pp->next)
1210 if (!strcmp(ident, pp->name))
1211 return pp->pattern;
1212 return NULL;
1213 }
1214
1215 static struct builtin_funcname_pattern {
1216 const char *name;
1217 const char *pattern;
1218 } builtin_funcname_pattern[] = {
1219 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1220 "new\\|return\\|switch\\|throw\\|while\\)\n"
1221 "^[ ]*\\(\\([ ]*"
1222 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1223 "[ ]*([^;]*$\\)" },
1224 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1225 };
1226
1227 static const char *diff_funcname_pattern(struct diff_filespec *one)
1228 {
1229 const char *ident, *pattern;
1230 int i;
1231
1232 diff_filespec_check_attr(one);
1233 ident = one->funcname_pattern_ident;
1234
1235 if (!ident)
1236 /*
1237 * If the config file has "funcname.default" defined, that
1238 * regexp is used; otherwise NULL is returned and xemit uses
1239 * the built-in default.
1240 */
1241 return funcname_pattern("default");
1242
1243 /* Look up custom "funcname.$ident" regexp from config. */
1244 pattern = funcname_pattern(ident);
1245 if (pattern)
1246 return pattern;
1247
1248 /*
1249 * And define built-in fallback patterns here. Note that
1250 * these can be overriden by the user's config settings.
1251 */
1252 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1253 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1254 return builtin_funcname_pattern[i].pattern;
1255
1256 return NULL;
1257 }
1258
1259 static void builtin_diff(const char *name_a,
1260 const char *name_b,
1261 struct diff_filespec *one,
1262 struct diff_filespec *two,
1263 const char *xfrm_msg,
1264 struct diff_options *o,
1265 int complete_rewrite)
1266 {
1267 mmfile_t mf1, mf2;
1268 const char *lbl[2];
1269 char *a_one, *b_two;
1270 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1271 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
1272
1273 a_one = quote_two("a/", name_a + (*name_a == '/'));
1274 b_two = quote_two("b/", name_b + (*name_b == '/'));
1275 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1276 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1277 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1278 if (lbl[0][0] == '/') {
1279 /* /dev/null */
1280 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1281 if (xfrm_msg && xfrm_msg[0])
1282 printf("%s%s%s\n", set, xfrm_msg, reset);
1283 }
1284 else if (lbl[1][0] == '/') {
1285 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1286 if (xfrm_msg && xfrm_msg[0])
1287 printf("%s%s%s\n", set, xfrm_msg, reset);
1288 }
1289 else {
1290 if (one->mode != two->mode) {
1291 printf("%sold mode %06o%s\n", set, one->mode, reset);
1292 printf("%snew mode %06o%s\n", set, two->mode, reset);
1293 }
1294 if (xfrm_msg && xfrm_msg[0])
1295 printf("%s%s%s\n", set, xfrm_msg, reset);
1296 /*
1297 * we do not run diff between different kind
1298 * of objects.
1299 */
1300 if ((one->mode ^ two->mode) & S_IFMT)
1301 goto free_ab_and_return;
1302 if (complete_rewrite) {
1303 emit_rewrite_diff(name_a, name_b, one, two,
1304 o->color_diff);
1305 o->found_changes = 1;
1306 goto free_ab_and_return;
1307 }
1308 }
1309
1310 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1311 die("unable to read files to diff");
1312
1313 if (!o->text &&
1314 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1315 /* Quite common confusing case */
1316 if (mf1.size == mf2.size &&
1317 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1318 goto free_ab_and_return;
1319 if (o->binary)
1320 emit_binary_diff(&mf1, &mf2);
1321 else
1322 printf("Binary files %s and %s differ\n",
1323 lbl[0], lbl[1]);
1324 o->found_changes = 1;
1325 }
1326 else {
1327 /* Crazy xdl interfaces.. */
1328 const char *diffopts = getenv("GIT_DIFF_OPTS");
1329 xpparam_t xpp;
1330 xdemitconf_t xecfg;
1331 xdemitcb_t ecb;
1332 struct emit_callback ecbdata;
1333 const char *funcname_pattern;
1334
1335 funcname_pattern = diff_funcname_pattern(one);
1336 if (!funcname_pattern)
1337 funcname_pattern = diff_funcname_pattern(two);
1338
1339 memset(&xecfg, 0, sizeof(xecfg));
1340 memset(&ecbdata, 0, sizeof(ecbdata));
1341 ecbdata.label_path = lbl;
1342 ecbdata.color_diff = o->color_diff;
1343 ecbdata.found_changesp = &o->found_changes;
1344 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1345 xecfg.ctxlen = o->context;
1346 xecfg.flags = XDL_EMIT_FUNCNAMES;
1347 if (funcname_pattern)
1348 xdiff_set_find_func(&xecfg, funcname_pattern);
1349 if (!diffopts)
1350 ;
1351 else if (!prefixcmp(diffopts, "--unified="))
1352 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1353 else if (!prefixcmp(diffopts, "-u"))
1354 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1355 ecb.outf = xdiff_outf;
1356 ecb.priv = &ecbdata;
1357 ecbdata.xm.consume = fn_out_consume;
1358 if (o->color_diff_words)
1359 ecbdata.diff_words =
1360 xcalloc(1, sizeof(struct diff_words_data));
1361 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1362 if (o->color_diff_words)
1363 free_diff_words_data(&ecbdata);
1364 }
1365
1366 free_ab_and_return:
1367 diff_free_filespec_data(one);
1368 diff_free_filespec_data(two);
1369 free(a_one);
1370 free(b_two);
1371 return;
1372 }
1373
1374 static void builtin_diffstat(const char *name_a, const char *name_b,
1375 struct diff_filespec *one,
1376 struct diff_filespec *two,
1377 struct diffstat_t *diffstat,
1378 struct diff_options *o,
1379 int complete_rewrite)
1380 {
1381 mmfile_t mf1, mf2;
1382 struct diffstat_file *data;
1383
1384 data = diffstat_add(diffstat, name_a, name_b);
1385
1386 if (!one || !two) {
1387 data->is_unmerged = 1;
1388 return;
1389 }
1390 if (complete_rewrite) {
1391 diff_populate_filespec(one, 0);
1392 diff_populate_filespec(two, 0);
1393 data->deleted = count_lines(one->data, one->size);
1394 data->added = count_lines(two->data, two->size);
1395 goto free_and_return;
1396 }
1397 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1398 die("unable to read files to diff");
1399
1400 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1401 data->is_binary = 1;
1402 data->added = mf2.size;
1403 data->deleted = mf1.size;
1404 } else {
1405 /* Crazy xdl interfaces.. */
1406 xpparam_t xpp;
1407 xdemitconf_t xecfg;
1408 xdemitcb_t ecb;
1409
1410 memset(&xecfg, 0, sizeof(xecfg));
1411 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1412 ecb.outf = xdiff_outf;
1413 ecb.priv = diffstat;
1414 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1415 }
1416
1417 free_and_return:
1418 diff_free_filespec_data(one);
1419 diff_free_filespec_data(two);
1420 }
1421
1422 static void builtin_checkdiff(const char *name_a, const char *name_b,
1423 struct diff_filespec *one,
1424 struct diff_filespec *two, struct diff_options *o)
1425 {
1426 mmfile_t mf1, mf2;
1427 struct checkdiff_t data;
1428
1429 if (!two)
1430 return;
1431
1432 memset(&data, 0, sizeof(data));
1433 data.xm.consume = checkdiff_consume;
1434 data.filename = name_b ? name_b : name_a;
1435 data.lineno = 0;
1436 data.color_diff = o->color_diff;
1437
1438 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1439 die("unable to read files to diff");
1440
1441 if (diff_filespec_is_binary(two))
1442 goto free_and_return;
1443 else {
1444 /* Crazy xdl interfaces.. */
1445 xpparam_t xpp;
1446 xdemitconf_t xecfg;
1447 xdemitcb_t ecb;
1448
1449 memset(&xecfg, 0, sizeof(xecfg));
1450 xpp.flags = XDF_NEED_MINIMAL;
1451 ecb.outf = xdiff_outf;
1452 ecb.priv = &data;
1453 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1454 }
1455 free_and_return:
1456 diff_free_filespec_data(one);
1457 diff_free_filespec_data(two);
1458 }
1459
1460 struct diff_filespec *alloc_filespec(const char *path)
1461 {
1462 int namelen = strlen(path);
1463 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1464
1465 memset(spec, 0, sizeof(*spec));
1466 spec->path = (char *)(spec + 1);
1467 memcpy(spec->path, path, namelen+1);
1468 return spec;
1469 }
1470
1471 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1472 unsigned short mode)
1473 {
1474 if (mode) {
1475 spec->mode = canon_mode(mode);
1476 hashcpy(spec->sha1, sha1);
1477 spec->sha1_valid = !is_null_sha1(sha1);
1478 }
1479 }
1480
1481 /*
1482 * Given a name and sha1 pair, if the index tells us the file in
1483 * the work tree has that object contents, return true, so that
1484 * prepare_temp_file() does not have to inflate and extract.
1485 */
1486 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1487 {
1488 struct cache_entry *ce;
1489 struct stat st;
1490 int pos, len;
1491
1492 /* We do not read the cache ourselves here, because the
1493 * benchmark with my previous version that always reads cache
1494 * shows that it makes things worse for diff-tree comparing
1495 * two linux-2.6 kernel trees in an already checked out work
1496 * tree. This is because most diff-tree comparisons deal with
1497 * only a small number of files, while reading the cache is
1498 * expensive for a large project, and its cost outweighs the
1499 * savings we get by not inflating the object to a temporary
1500 * file. Practically, this code only helps when we are used
1501 * by diff-cache --cached, which does read the cache before
1502 * calling us.
1503 */
1504 if (!active_cache)
1505 return 0;
1506
1507 /* We want to avoid the working directory if our caller
1508 * doesn't need the data in a normal file, this system
1509 * is rather slow with its stat/open/mmap/close syscalls,
1510 * and the object is contained in a pack file. The pack
1511 * is probably already open and will be faster to obtain
1512 * the data through than the working directory. Loose
1513 * objects however would tend to be slower as they need
1514 * to be individually opened and inflated.
1515 */
1516 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1517 return 0;
1518
1519 len = strlen(name);
1520 pos = cache_name_pos(name, len);
1521 if (pos < 0)
1522 return 0;
1523 ce = active_cache[pos];
1524 if ((lstat(name, &st) < 0) ||
1525 !S_ISREG(st.st_mode) || /* careful! */
1526 ce_match_stat(ce, &st, 0) ||
1527 hashcmp(sha1, ce->sha1))
1528 return 0;
1529 /* we return 1 only when we can stat, it is a regular file,
1530 * stat information matches, and sha1 recorded in the cache
1531 * matches. I.e. we know the file in the work tree really is
1532 * the same as the <name, sha1> pair.
1533 */
1534 return 1;
1535 }
1536
1537 static int populate_from_stdin(struct diff_filespec *s)
1538 {
1539 struct strbuf buf;
1540
1541 strbuf_init(&buf, 0);
1542 if (strbuf_read(&buf, 0, 0) < 0)
1543 return error("error while reading from stdin %s",
1544 strerror(errno));
1545
1546 s->should_munmap = 0;
1547 s->size = buf.len;
1548 s->data = strbuf_detach(&buf);
1549 s->should_free = 1;
1550 return 0;
1551 }
1552
1553 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1554 {
1555 int len;
1556 char *data = xmalloc(100);
1557 len = snprintf(data, 100,
1558 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1559 s->data = data;
1560 s->size = len;
1561 s->should_free = 1;
1562 if (size_only) {
1563 s->data = NULL;
1564 free(data);
1565 }
1566 return 0;
1567 }
1568
1569 /*
1570 * While doing rename detection and pickaxe operation, we may need to
1571 * grab the data for the blob (or file) for our own in-core comparison.
1572 * diff_filespec has data and size fields for this purpose.
1573 */
1574 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1575 {
1576 int err = 0;
1577 if (!DIFF_FILE_VALID(s))
1578 die("internal error: asking to populate invalid file.");
1579 if (S_ISDIR(s->mode))
1580 return -1;
1581
1582 if (s->data)
1583 return 0;
1584
1585 if (size_only && 0 < s->size)
1586 return 0;
1587
1588 if (S_ISGITLINK(s->mode))
1589 return diff_populate_gitlink(s, size_only);
1590
1591 if (!s->sha1_valid ||
1592 reuse_worktree_file(s->path, s->sha1, 0)) {
1593 struct strbuf buf;
1594 struct stat st;
1595 int fd;
1596
1597 if (!strcmp(s->path, "-"))
1598 return populate_from_stdin(s);
1599
1600 if (lstat(s->path, &st) < 0) {
1601 if (errno == ENOENT) {
1602 err_empty:
1603 err = -1;
1604 empty:
1605 s->data = (char *)"";
1606 s->size = 0;
1607 return err;
1608 }
1609 }
1610 s->size = xsize_t(st.st_size);
1611 if (!s->size)
1612 goto empty;
1613 if (size_only)
1614 return 0;
1615 if (S_ISLNK(st.st_mode)) {
1616 int ret;
1617 s->data = xmalloc(s->size);
1618 s->should_free = 1;
1619 ret = readlink(s->path, s->data, s->size);
1620 if (ret < 0) {
1621 free(s->data);
1622 goto err_empty;
1623 }
1624 return 0;
1625 }
1626 fd = open(s->path, O_RDONLY);
1627 if (fd < 0)
1628 goto err_empty;
1629 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1630 close(fd);
1631 s->should_munmap = 1;
1632
1633 /*
1634 * Convert from working tree format to canonical git format
1635 */
1636 strbuf_init(&buf, 0);
1637 if (convert_to_git(s->path, s->data, s->size, &buf)) {
1638 munmap(s->data, s->size);
1639 s->should_munmap = 0;
1640 s->data = buf.buf;
1641 s->size = buf.len;
1642 s->should_free = 1;
1643 }
1644 }
1645 else {
1646 enum object_type type;
1647 if (size_only)
1648 type = sha1_object_info(s->sha1, &s->size);
1649 else {
1650 s->data = read_sha1_file(s->sha1, &type, &s->size);
1651 s->should_free = 1;
1652 }
1653 }
1654 return 0;
1655 }
1656
1657 void diff_free_filespec_data(struct diff_filespec *s)
1658 {
1659 if (s->should_free)
1660 free(s->data);
1661 else if (s->should_munmap)
1662 munmap(s->data, s->size);
1663
1664 if (s->should_free || s->should_munmap) {
1665 s->should_free = s->should_munmap = 0;
1666 s->data = NULL;
1667 }
1668 free(s->cnt_data);
1669 s->cnt_data = NULL;
1670 }
1671
1672 static void prep_temp_blob(struct diff_tempfile *temp,
1673 void *blob,
1674 unsigned long size,
1675 const unsigned char *sha1,
1676 int mode)
1677 {
1678 int fd;
1679
1680 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1681 if (fd < 0)
1682 die("unable to create temp-file: %s", strerror(errno));
1683 if (write_in_full(fd, blob, size) != size)
1684 die("unable to write temp-file");
1685 close(fd);
1686 temp->name = temp->tmp_path;
1687 strcpy(temp->hex, sha1_to_hex(sha1));
1688 temp->hex[40] = 0;
1689 sprintf(temp->mode, "%06o", mode);
1690 }
1691
1692 static void prepare_temp_file(const char *name,
1693 struct diff_tempfile *temp,
1694 struct diff_filespec *one)
1695 {
1696 if (!DIFF_FILE_VALID(one)) {
1697 not_a_valid_file:
1698 /* A '-' entry produces this for file-2, and
1699 * a '+' entry produces this for file-1.
1700 */
1701 temp->name = "/dev/null";
1702 strcpy(temp->hex, ".");
1703 strcpy(temp->mode, ".");
1704 return;
1705 }
1706
1707 if (!one->sha1_valid ||
1708 reuse_worktree_file(name, one->sha1, 1)) {
1709 struct stat st;
1710 if (lstat(name, &st) < 0) {
1711 if (errno == ENOENT)
1712 goto not_a_valid_file;
1713 die("stat(%s): %s", name, strerror(errno));
1714 }
1715 if (S_ISLNK(st.st_mode)) {
1716 int ret;
1717 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1718 size_t sz = xsize_t(st.st_size);
1719 if (sizeof(buf) <= st.st_size)
1720 die("symlink too long: %s", name);
1721 ret = readlink(name, buf, sz);
1722 if (ret < 0)
1723 die("readlink(%s)", name);
1724 prep_temp_blob(temp, buf, sz,
1725 (one->sha1_valid ?
1726 one->sha1 : null_sha1),
1727 (one->sha1_valid ?
1728 one->mode : S_IFLNK));
1729 }
1730 else {
1731 /* we can borrow from the file in the work tree */
1732 temp->name = name;
1733 if (!one->sha1_valid)
1734 strcpy(temp->hex, sha1_to_hex(null_sha1));
1735 else
1736 strcpy(temp->hex, sha1_to_hex(one->sha1));
1737 /* Even though we may sometimes borrow the
1738 * contents from the work tree, we always want
1739 * one->mode. mode is trustworthy even when
1740 * !(one->sha1_valid), as long as
1741 * DIFF_FILE_VALID(one).
1742 */
1743 sprintf(temp->mode, "%06o", one->mode);
1744 }
1745 return;
1746 }
1747 else {
1748 if (diff_populate_filespec(one, 0))
1749 die("cannot read data blob for %s", one->path);
1750 prep_temp_blob(temp, one->data, one->size,
1751 one->sha1, one->mode);
1752 }
1753 }
1754
1755 static void remove_tempfile(void)
1756 {
1757 int i;
1758
1759 for (i = 0; i < 2; i++)
1760 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1761 unlink(diff_temp[i].name);
1762 diff_temp[i].name = NULL;
1763 }
1764 }
1765
1766 static void remove_tempfile_on_signal(int signo)
1767 {
1768 remove_tempfile();
1769 signal(SIGINT, SIG_DFL);
1770 raise(signo);
1771 }
1772
1773 static int spawn_prog(const char *pgm, const char **arg)
1774 {
1775 pid_t pid;
1776 int status;
1777
1778 fflush(NULL);
1779 pid = fork();
1780 if (pid < 0)
1781 die("unable to fork");
1782 if (!pid) {
1783 execvp(pgm, (char *const*) arg);
1784 exit(255);
1785 }
1786
1787 while (waitpid(pid, &status, 0) < 0) {
1788 if (errno == EINTR)
1789 continue;
1790 return -1;
1791 }
1792
1793 /* Earlier we did not check the exit status because
1794 * diff exits non-zero if files are different, and
1795 * we are not interested in knowing that. It was a
1796 * mistake which made it harder to quit a diff-*
1797 * session that uses the git-apply-patch-script as
1798 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1799 * should also exit non-zero only when it wants to
1800 * abort the entire diff-* session.
1801 */
1802 if (WIFEXITED(status) && !WEXITSTATUS(status))
1803 return 0;
1804 return -1;
1805 }
1806
1807 /* An external diff command takes:
1808 *
1809 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1810 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1811 *
1812 */
1813 static void run_external_diff(const char *pgm,
1814 const char *name,
1815 const char *other,
1816 struct diff_filespec *one,
1817 struct diff_filespec *two,
1818 const char *xfrm_msg,
1819 int complete_rewrite)
1820 {
1821 const char *spawn_arg[10];
1822 struct diff_tempfile *temp = diff_temp;
1823 int retval;
1824 static int atexit_asked = 0;
1825 const char *othername;
1826 const char **arg = &spawn_arg[0];
1827
1828 othername = (other? other : name);
1829 if (one && two) {
1830 prepare_temp_file(name, &temp[0], one);
1831 prepare_temp_file(othername, &temp[1], two);
1832 if (! atexit_asked &&
1833 (temp[0].name == temp[0].tmp_path ||
1834 temp[1].name == temp[1].tmp_path)) {
1835 atexit_asked = 1;
1836 atexit(remove_tempfile);
1837 }
1838 signal(SIGINT, remove_tempfile_on_signal);
1839 }
1840
1841 if (one && two) {
1842 *arg++ = pgm;
1843 *arg++ = name;
1844 *arg++ = temp[0].name;
1845 *arg++ = temp[0].hex;
1846 *arg++ = temp[0].mode;
1847 *arg++ = temp[1].name;
1848 *arg++ = temp[1].hex;
1849 *arg++ = temp[1].mode;
1850 if (other) {
1851 *arg++ = other;
1852 *arg++ = xfrm_msg;
1853 }
1854 } else {
1855 *arg++ = pgm;
1856 *arg++ = name;
1857 }
1858 *arg = NULL;
1859 retval = spawn_prog(pgm, spawn_arg);
1860 remove_tempfile();
1861 if (retval) {
1862 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1863 exit(1);
1864 }
1865 }
1866
1867 static const char *external_diff_attr(const char *name)
1868 {
1869 struct git_attr_check attr_diff_check;
1870
1871 setup_diff_attr_check(&attr_diff_check);
1872 if (!git_checkattr(name, 1, &attr_diff_check)) {
1873 const char *value = attr_diff_check.value;
1874 if (!ATTR_TRUE(value) &&
1875 !ATTR_FALSE(value) &&
1876 !ATTR_UNSET(value)) {
1877 struct ll_diff_driver *drv;
1878
1879 read_config_if_needed();
1880 for (drv = user_diff; drv; drv = drv->next)
1881 if (!strcmp(drv->name, value))
1882 return drv->cmd;
1883 }
1884 }
1885 return NULL;
1886 }
1887
1888 static void run_diff_cmd(const char *pgm,
1889 const char *name,
1890 const char *other,
1891 struct diff_filespec *one,
1892 struct diff_filespec *two,
1893 const char *xfrm_msg,
1894 struct diff_options *o,
1895 int complete_rewrite)
1896 {
1897 if (!o->allow_external)
1898 pgm = NULL;
1899 else {
1900 const char *cmd = external_diff_attr(name);
1901 if (cmd)
1902 pgm = cmd;
1903 }
1904
1905 if (pgm) {
1906 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1907 complete_rewrite);
1908 return;
1909 }
1910 if (one && two)
1911 builtin_diff(name, other ? other : name,
1912 one, two, xfrm_msg, o, complete_rewrite);
1913 else
1914 printf("* Unmerged path %s\n", name);
1915 }
1916
1917 static void diff_fill_sha1_info(struct diff_filespec *one)
1918 {
1919 if (DIFF_FILE_VALID(one)) {
1920 if (!one->sha1_valid) {
1921 struct stat st;
1922 if (!strcmp(one->path, "-")) {
1923 hashcpy(one->sha1, null_sha1);
1924 return;
1925 }
1926 if (lstat(one->path, &st) < 0)
1927 die("stat %s", one->path);
1928 if (index_path(one->sha1, one->path, &st, 0))
1929 die("cannot hash %s\n", one->path);
1930 }
1931 }
1932 else
1933 hashclr(one->sha1);
1934 }
1935
1936 static int similarity_index(struct diff_filepair *p)
1937 {
1938 return p->score * 100 / MAX_SCORE;
1939 }
1940
1941 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1942 {
1943 const char *pgm = external_diff();
1944 char msg[PATH_MAX*2+300], *xfrm_msg;
1945 struct diff_filespec *one;
1946 struct diff_filespec *two;
1947 const char *name;
1948 const char *other;
1949 char *name_munged, *other_munged;
1950 int complete_rewrite = 0;
1951 int len;
1952
1953 if (DIFF_PAIR_UNMERGED(p)) {
1954 /* unmerged */
1955 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1956 return;
1957 }
1958
1959 name = p->one->path;
1960 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1961 name_munged = quote_one(name);
1962 other_munged = quote_one(other);
1963 one = p->one; two = p->two;
1964
1965 diff_fill_sha1_info(one);
1966 diff_fill_sha1_info(two);
1967
1968 len = 0;
1969 switch (p->status) {
1970 case DIFF_STATUS_COPIED:
1971 len += snprintf(msg + len, sizeof(msg) - len,
1972 "similarity index %d%%\n"
1973 "copy from %s\n"
1974 "copy to %s\n",
1975 similarity_index(p), name_munged, other_munged);
1976 break;
1977 case DIFF_STATUS_RENAMED:
1978 len += snprintf(msg + len, sizeof(msg) - len,
1979 "similarity index %d%%\n"
1980 "rename from %s\n"
1981 "rename to %s\n",
1982 similarity_index(p), name_munged, other_munged);
1983 break;
1984 case DIFF_STATUS_MODIFIED:
1985 if (p->score) {
1986 len += snprintf(msg + len, sizeof(msg) - len,
1987 "dissimilarity index %d%%\n",
1988 similarity_index(p));
1989 complete_rewrite = 1;
1990 break;
1991 }
1992 /* fallthru */
1993 default:
1994 /* nothing */
1995 ;
1996 }
1997
1998 if (hashcmp(one->sha1, two->sha1)) {
1999 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
2000
2001 if (o->binary) {
2002 mmfile_t mf;
2003 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2004 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2005 abbrev = 40;
2006 }
2007 len += snprintf(msg + len, sizeof(msg) - len,
2008 "index %.*s..%.*s",
2009 abbrev, sha1_to_hex(one->sha1),
2010 abbrev, sha1_to_hex(two->sha1));
2011 if (one->mode == two->mode)
2012 len += snprintf(msg + len, sizeof(msg) - len,
2013 " %06o", one->mode);
2014 len += snprintf(msg + len, sizeof(msg) - len, "\n");
2015 }
2016
2017 if (len)
2018 msg[--len] = 0;
2019 xfrm_msg = len ? msg : NULL;
2020
2021 if (!pgm &&
2022 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2023 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2024 /* a filepair that changes between file and symlink
2025 * needs to be split into deletion and creation.
2026 */
2027 struct diff_filespec *null = alloc_filespec(two->path);
2028 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
2029 free(null);
2030 null = alloc_filespec(one->path);
2031 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
2032 free(null);
2033 }
2034 else
2035 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
2036 complete_rewrite);
2037
2038 free(name_munged);
2039 free(other_munged);
2040 }
2041
2042 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2043 struct diffstat_t *diffstat)
2044 {
2045 const char *name;
2046 const char *other;
2047 int complete_rewrite = 0;
2048
2049 if (DIFF_PAIR_UNMERGED(p)) {
2050 /* unmerged */
2051 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2052 return;
2053 }
2054
2055 name = p->one->path;
2056 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2057
2058 diff_fill_sha1_info(p->one);
2059 diff_fill_sha1_info(p->two);
2060
2061 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2062 complete_rewrite = 1;
2063 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2064 }
2065
2066 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2067 {
2068 const char *name;
2069 const char *other;
2070
2071 if (DIFF_PAIR_UNMERGED(p)) {
2072 /* unmerged */
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 builtin_checkdiff(name, other, p->one, p->two, o);
2083 }
2084
2085 void diff_setup(struct diff_options *options)
2086 {
2087 memset(options, 0, sizeof(*options));
2088 options->line_termination = '\n';
2089 options->break_opt = -1;
2090 options->rename_limit = -1;
2091 options->context = 3;
2092 options->msg_sep = "";
2093
2094 options->change = diff_change;
2095 options->add_remove = diff_addremove;
2096 options->color_diff = diff_use_color_default;
2097 options->detect_rename = diff_detect_rename_default;
2098 }
2099
2100 int diff_setup_done(struct diff_options *options)
2101 {
2102 int count = 0;
2103
2104 if (options->output_format & DIFF_FORMAT_NAME)
2105 count++;
2106 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2107 count++;
2108 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2109 count++;
2110 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2111 count++;
2112 if (count > 1)
2113 die("--name-only, --name-status, --check and -s are mutually exclusive");
2114
2115 if (options->find_copies_harder)
2116 options->detect_rename = DIFF_DETECT_COPY;
2117
2118 if (options->output_format & (DIFF_FORMAT_NAME |
2119 DIFF_FORMAT_NAME_STATUS |
2120 DIFF_FORMAT_CHECKDIFF |
2121 DIFF_FORMAT_NO_OUTPUT))
2122 options->output_format &= ~(DIFF_FORMAT_RAW |
2123 DIFF_FORMAT_NUMSTAT |
2124 DIFF_FORMAT_DIFFSTAT |
2125 DIFF_FORMAT_SHORTSTAT |
2126 DIFF_FORMAT_SUMMARY |
2127 DIFF_FORMAT_PATCH);
2128
2129 /*
2130 * These cases always need recursive; we do not drop caller-supplied
2131 * recursive bits for other formats here.
2132 */
2133 if (options->output_format & (DIFF_FORMAT_PATCH |
2134 DIFF_FORMAT_NUMSTAT |
2135 DIFF_FORMAT_DIFFSTAT |
2136 DIFF_FORMAT_SHORTSTAT |
2137 DIFF_FORMAT_SUMMARY |
2138 DIFF_FORMAT_CHECKDIFF))
2139 options->recursive = 1;
2140 /*
2141 * Also pickaxe would not work very well if you do not say recursive
2142 */
2143 if (options->pickaxe)
2144 options->recursive = 1;
2145
2146 if (options->detect_rename && options->rename_limit < 0)
2147 options->rename_limit = diff_rename_limit_default;
2148 if (options->setup & DIFF_SETUP_USE_CACHE) {
2149 if (!active_cache)
2150 /* read-cache does not die even when it fails
2151 * so it is safe for us to do this here. Also
2152 * it does not smudge active_cache or active_nr
2153 * when it fails, so we do not have to worry about
2154 * cleaning it up ourselves either.
2155 */
2156 read_cache();
2157 }
2158 if (options->abbrev <= 0 || 40 < options->abbrev)
2159 options->abbrev = 40; /* full */
2160
2161 /*
2162 * It does not make sense to show the first hit we happened
2163 * to have found. It does not make sense not to return with
2164 * exit code in such a case either.
2165 */
2166 if (options->quiet) {
2167 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2168 options->exit_with_status = 1;
2169 }
2170
2171 /*
2172 * If we postprocess in diffcore, we cannot simply return
2173 * upon the first hit. We need to run diff as usual.
2174 */
2175 if (options->pickaxe || options->filter)
2176 options->quiet = 0;
2177
2178 return 0;
2179 }
2180
2181 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2182 {
2183 char c, *eq;
2184 int len;
2185
2186 if (*arg != '-')
2187 return 0;
2188 c = *++arg;
2189 if (!c)
2190 return 0;
2191 if (c == arg_short) {
2192 c = *++arg;
2193 if (!c)
2194 return 1;
2195 if (val && isdigit(c)) {
2196 char *end;
2197 int n = strtoul(arg, &end, 10);
2198 if (*end)
2199 return 0;
2200 *val = n;
2201 return 1;
2202 }
2203 return 0;
2204 }
2205 if (c != '-')
2206 return 0;
2207 arg++;
2208 eq = strchr(arg, '=');
2209 if (eq)
2210 len = eq - arg;
2211 else
2212 len = strlen(arg);
2213 if (!len || strncmp(arg, arg_long, len))
2214 return 0;
2215 if (eq) {
2216 int n;
2217 char *end;
2218 if (!isdigit(*++eq))
2219 return 0;
2220 n = strtoul(eq, &end, 10);
2221 if (*end)
2222 return 0;
2223 *val = n;
2224 }
2225 return 1;
2226 }
2227
2228 static int diff_scoreopt_parse(const char *opt);
2229
2230 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2231 {
2232 const char *arg = av[0];
2233 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2234 options->output_format |= DIFF_FORMAT_PATCH;
2235 else if (opt_arg(arg, 'U', "unified", &options->context))
2236 options->output_format |= DIFF_FORMAT_PATCH;
2237 else if (!strcmp(arg, "--raw"))
2238 options->output_format |= DIFF_FORMAT_RAW;
2239 else if (!strcmp(arg, "--patch-with-raw")) {
2240 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2241 }
2242 else if (!strcmp(arg, "--numstat")) {
2243 options->output_format |= DIFF_FORMAT_NUMSTAT;
2244 }
2245 else if (!strcmp(arg, "--shortstat")) {
2246 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2247 }
2248 else if (!prefixcmp(arg, "--stat")) {
2249 char *end;
2250 int width = options->stat_width;
2251 int name_width = options->stat_name_width;
2252 arg += 6;
2253 end = (char *)arg;
2254
2255 switch (*arg) {
2256 case '-':
2257 if (!prefixcmp(arg, "-width="))
2258 width = strtoul(arg + 7, &end, 10);
2259 else if (!prefixcmp(arg, "-name-width="))
2260 name_width = strtoul(arg + 12, &end, 10);
2261 break;
2262 case '=':
2263 width = strtoul(arg+1, &end, 10);
2264 if (*end == ',')
2265 name_width = strtoul(end+1, &end, 10);
2266 }
2267
2268 /* Important! This checks all the error cases! */
2269 if (*end)
2270 return 0;
2271 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2272 options->stat_name_width = name_width;
2273 options->stat_width = width;
2274 }
2275 else if (!strcmp(arg, "--check"))
2276 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2277 else if (!strcmp(arg, "--summary"))
2278 options->output_format |= DIFF_FORMAT_SUMMARY;
2279 else if (!strcmp(arg, "--patch-with-stat")) {
2280 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2281 }
2282 else if (!strcmp(arg, "-z"))
2283 options->line_termination = 0;
2284 else if (!prefixcmp(arg, "-l"))
2285 options->rename_limit = strtoul(arg+2, NULL, 10);
2286 else if (!strcmp(arg, "--full-index"))
2287 options->full_index = 1;
2288 else if (!strcmp(arg, "--binary")) {
2289 options->output_format |= DIFF_FORMAT_PATCH;
2290 options->binary = 1;
2291 }
2292 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
2293 options->text = 1;
2294 }
2295 else if (!strcmp(arg, "--name-only"))
2296 options->output_format |= DIFF_FORMAT_NAME;
2297 else if (!strcmp(arg, "--name-status"))
2298 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2299 else if (!strcmp(arg, "-R"))
2300 options->reverse_diff = 1;
2301 else if (!prefixcmp(arg, "-S"))
2302 options->pickaxe = arg + 2;
2303 else if (!strcmp(arg, "-s")) {
2304 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2305 }
2306 else if (!prefixcmp(arg, "-O"))
2307 options->orderfile = arg + 2;
2308 else if (!prefixcmp(arg, "--diff-filter="))
2309 options->filter = arg + 14;
2310 else if (!strcmp(arg, "--pickaxe-all"))
2311 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2312 else if (!strcmp(arg, "--pickaxe-regex"))
2313 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2314 else if (!prefixcmp(arg, "-B")) {
2315 if ((options->break_opt =
2316 diff_scoreopt_parse(arg)) == -1)
2317 return -1;
2318 }
2319 else if (!prefixcmp(arg, "-M")) {
2320 if ((options->rename_score =
2321 diff_scoreopt_parse(arg)) == -1)
2322 return -1;
2323 options->detect_rename = DIFF_DETECT_RENAME;
2324 }
2325 else if (!prefixcmp(arg, "-C")) {
2326 if (options->detect_rename == DIFF_DETECT_COPY)
2327 options->find_copies_harder = 1;
2328 if ((options->rename_score =
2329 diff_scoreopt_parse(arg)) == -1)
2330 return -1;
2331 options->detect_rename = DIFF_DETECT_COPY;
2332 }
2333 else if (!strcmp(arg, "--find-copies-harder"))
2334 options->find_copies_harder = 1;
2335 else if (!strcmp(arg, "--follow"))
2336 options->follow_renames = 1;
2337 else if (!strcmp(arg, "--abbrev"))
2338 options->abbrev = DEFAULT_ABBREV;
2339 else if (!prefixcmp(arg, "--abbrev=")) {
2340 options->abbrev = strtoul(arg + 9, NULL, 10);
2341 if (options->abbrev < MINIMUM_ABBREV)
2342 options->abbrev = MINIMUM_ABBREV;
2343 else if (40 < options->abbrev)
2344 options->abbrev = 40;
2345 }
2346 else if (!strcmp(arg, "--color"))
2347 options->color_diff = 1;
2348 else if (!strcmp(arg, "--no-color"))
2349 options->color_diff = 0;
2350 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2351 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2352 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2353 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2354 else if (!strcmp(arg, "--ignore-space-at-eol"))
2355 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2356 else if (!strcmp(arg, "--color-words"))
2357 options->color_diff = options->color_diff_words = 1;
2358 else if (!strcmp(arg, "--no-renames"))
2359 options->detect_rename = 0;
2360 else if (!strcmp(arg, "--exit-code"))
2361 options->exit_with_status = 1;
2362 else if (!strcmp(arg, "--quiet"))
2363 options->quiet = 1;
2364 else if (!strcmp(arg, "--ext-diff"))
2365 options->allow_external = 1;
2366 else if (!strcmp(arg, "--no-ext-diff"))
2367 options->allow_external = 0;
2368 else
2369 return 0;
2370 return 1;
2371 }
2372
2373 static int parse_num(const char **cp_p)
2374 {
2375 unsigned long num, scale;
2376 int ch, dot;
2377 const char *cp = *cp_p;
2378
2379 num = 0;
2380 scale = 1;
2381 dot = 0;
2382 for(;;) {
2383 ch = *cp;
2384 if ( !dot && ch == '.' ) {
2385 scale = 1;
2386 dot = 1;
2387 } else if ( ch == '%' ) {
2388 scale = dot ? scale*100 : 100;
2389 cp++; /* % is always at the end */
2390 break;
2391 } else if ( ch >= '0' && ch <= '9' ) {
2392 if ( scale < 100000 ) {
2393 scale *= 10;
2394 num = (num*10) + (ch-'0');
2395 }
2396 } else {
2397 break;
2398 }
2399 cp++;
2400 }
2401 *cp_p = cp;
2402
2403 /* user says num divided by scale and we say internally that
2404 * is MAX_SCORE * num / scale.
2405 */
2406 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2407 }
2408
2409 static int diff_scoreopt_parse(const char *opt)
2410 {
2411 int opt1, opt2, cmd;
2412
2413 if (*opt++ != '-')
2414 return -1;
2415 cmd = *opt++;
2416 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2417 return -1; /* that is not a -M, -C nor -B option */
2418
2419 opt1 = parse_num(&opt);
2420 if (cmd != 'B')
2421 opt2 = 0;
2422 else {
2423 if (*opt == 0)
2424 opt2 = 0;
2425 else if (*opt != '/')
2426 return -1; /* we expect -B80/99 or -B80 */
2427 else {
2428 opt++;
2429 opt2 = parse_num(&opt);
2430 }
2431 }
2432 if (*opt != 0)
2433 return -1;
2434 return opt1 | (opt2 << 16);
2435 }
2436
2437 struct diff_queue_struct diff_queued_diff;
2438
2439 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2440 {
2441 if (queue->alloc <= queue->nr) {
2442 queue->alloc = alloc_nr(queue->alloc);
2443 queue->queue = xrealloc(queue->queue,
2444 sizeof(dp) * queue->alloc);
2445 }
2446 queue->queue[queue->nr++] = dp;
2447 }
2448
2449 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2450 struct diff_filespec *one,
2451 struct diff_filespec *two)
2452 {
2453 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2454 dp->one = one;
2455 dp->two = two;
2456 if (queue)
2457 diff_q(queue, dp);
2458 return dp;
2459 }
2460
2461 void diff_free_filepair(struct diff_filepair *p)
2462 {
2463 diff_free_filespec_data(p->one);
2464 diff_free_filespec_data(p->two);
2465 free(p->one);
2466 free(p->two);
2467 free(p);
2468 }
2469
2470 /* This is different from find_unique_abbrev() in that
2471 * it stuffs the result with dots for alignment.
2472 */
2473 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2474 {
2475 int abblen;
2476 const char *abbrev;
2477 if (len == 40)
2478 return sha1_to_hex(sha1);
2479
2480 abbrev = find_unique_abbrev(sha1, len);
2481 if (!abbrev)
2482 return sha1_to_hex(sha1);
2483 abblen = strlen(abbrev);
2484 if (abblen < 37) {
2485 static char hex[41];
2486 if (len < abblen && abblen <= len + 2)
2487 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2488 else
2489 sprintf(hex, "%s...", abbrev);
2490 return hex;
2491 }
2492 return sha1_to_hex(sha1);
2493 }
2494
2495 static void diff_flush_raw(struct diff_filepair *p,
2496 struct diff_options *options)
2497 {
2498 int two_paths;
2499 char status[10];
2500 int abbrev = options->abbrev;
2501 const char *path_one, *path_two;
2502 int inter_name_termination = '\t';
2503 int line_termination = options->line_termination;
2504
2505 if (!line_termination)
2506 inter_name_termination = 0;
2507
2508 path_one = p->one->path;
2509 path_two = p->two->path;
2510 if (line_termination) {
2511 path_one = quote_one(path_one);
2512 path_two = quote_one(path_two);
2513 }
2514
2515 if (p->score)
2516 sprintf(status, "%c%03d", p->status, similarity_index(p));
2517 else {
2518 status[0] = p->status;
2519 status[1] = 0;
2520 }
2521 switch (p->status) {
2522 case DIFF_STATUS_COPIED:
2523 case DIFF_STATUS_RENAMED:
2524 two_paths = 1;
2525 break;
2526 case DIFF_STATUS_ADDED:
2527 case DIFF_STATUS_DELETED:
2528 two_paths = 0;
2529 break;
2530 default:
2531 two_paths = 0;
2532 break;
2533 }
2534 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
2535 printf(":%06o %06o %s ",
2536 p->one->mode, p->two->mode,
2537 diff_unique_abbrev(p->one->sha1, abbrev));
2538 printf("%s ",
2539 diff_unique_abbrev(p->two->sha1, abbrev));
2540 }
2541 printf("%s%c%s", status, inter_name_termination,
2542 two_paths || p->one->mode ? path_one : path_two);
2543 if (two_paths)
2544 printf("%c%s", inter_name_termination, path_two);
2545 putchar(line_termination);
2546 if (path_one != p->one->path)
2547 free((void*)path_one);
2548 if (path_two != p->two->path)
2549 free((void*)path_two);
2550 }
2551
2552 static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
2553 {
2554 char *path = p->two->path;
2555
2556 if (opt->line_termination)
2557 path = quote_one(p->two->path);
2558 printf("%s%c", path, opt->line_termination);
2559 if (p->two->path != path)
2560 free(path);
2561 }
2562
2563 int diff_unmodified_pair(struct diff_filepair *p)
2564 {
2565 /* This function is written stricter than necessary to support
2566 * the currently implemented transformers, but the idea is to
2567 * let transformers to produce diff_filepairs any way they want,
2568 * and filter and clean them up here before producing the output.
2569 */
2570 struct diff_filespec *one, *two;
2571
2572 if (DIFF_PAIR_UNMERGED(p))
2573 return 0; /* unmerged is interesting */
2574
2575 one = p->one;
2576 two = p->two;
2577
2578 /* deletion, addition, mode or type change
2579 * and rename are all interesting.
2580 */
2581 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2582 DIFF_PAIR_MODE_CHANGED(p) ||
2583 strcmp(one->path, two->path))
2584 return 0;
2585
2586 /* both are valid and point at the same path. that is, we are
2587 * dealing with a change.
2588 */
2589 if (one->sha1_valid && two->sha1_valid &&
2590 !hashcmp(one->sha1, two->sha1))
2591 return 1; /* no change */
2592 if (!one->sha1_valid && !two->sha1_valid)
2593 return 1; /* both look at the same file on the filesystem. */
2594 return 0;
2595 }
2596
2597 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2598 {
2599 if (diff_unmodified_pair(p))
2600 return;
2601
2602 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2603 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2604 return; /* no tree diffs in patch format */
2605
2606 run_diff(p, o);
2607 }
2608
2609 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2610 struct diffstat_t *diffstat)
2611 {
2612 if (diff_unmodified_pair(p))
2613 return;
2614
2615 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2616 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2617 return; /* no tree diffs in patch format */
2618
2619 run_diffstat(p, o, diffstat);
2620 }
2621
2622 static void diff_flush_checkdiff(struct diff_filepair *p,
2623 struct diff_options *o)
2624 {
2625 if (diff_unmodified_pair(p))
2626 return;
2627
2628 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2629 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2630 return; /* no tree diffs in patch format */
2631
2632 run_checkdiff(p, o);
2633 }
2634
2635 int diff_queue_is_empty(void)
2636 {
2637 struct diff_queue_struct *q = &diff_queued_diff;
2638 int i;
2639 for (i = 0; i < q->nr; i++)
2640 if (!diff_unmodified_pair(q->queue[i]))
2641 return 0;
2642 return 1;
2643 }
2644
2645 #if DIFF_DEBUG
2646 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2647 {
2648 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2649 x, one ? one : "",
2650 s->path,
2651 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2652 s->mode,
2653 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2654 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2655 x, one ? one : "",
2656 s->size, s->xfrm_flags);
2657 }
2658
2659 void diff_debug_filepair(const struct diff_filepair *p, int i)
2660 {
2661 diff_debug_filespec(p->one, i, "one");
2662 diff_debug_filespec(p->two, i, "two");
2663 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2664 p->score, p->status ? p->status : '?',
2665 p->source_stays, p->broken_pair);
2666 }
2667
2668 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2669 {
2670 int i;
2671 if (msg)
2672 fprintf(stderr, "%s\n", msg);
2673 fprintf(stderr, "q->nr = %d\n", q->nr);
2674 for (i = 0; i < q->nr; i++) {
2675 struct diff_filepair *p = q->queue[i];
2676 diff_debug_filepair(p, i);
2677 }
2678 }
2679 #endif
2680
2681 static void diff_resolve_rename_copy(void)
2682 {
2683 int i, j;
2684 struct diff_filepair *p, *pp;
2685 struct diff_queue_struct *q = &diff_queued_diff;
2686
2687 diff_debug_queue("resolve-rename-copy", q);
2688
2689 for (i = 0; i < q->nr; i++) {
2690 p = q->queue[i];
2691 p->status = 0; /* undecided */
2692 if (DIFF_PAIR_UNMERGED(p))
2693 p->status = DIFF_STATUS_UNMERGED;
2694 else if (!DIFF_FILE_VALID(p->one))
2695 p->status = DIFF_STATUS_ADDED;
2696 else if (!DIFF_FILE_VALID(p->two))
2697 p->status = DIFF_STATUS_DELETED;
2698 else if (DIFF_PAIR_TYPE_CHANGED(p))
2699 p->status = DIFF_STATUS_TYPE_CHANGED;
2700
2701 /* from this point on, we are dealing with a pair
2702 * whose both sides are valid and of the same type, i.e.
2703 * either in-place edit or rename/copy edit.
2704 */
2705 else if (DIFF_PAIR_RENAME(p)) {
2706 if (p->source_stays) {
2707 p->status = DIFF_STATUS_COPIED;
2708 continue;
2709 }
2710 /* See if there is some other filepair that
2711 * copies from the same source as us. If so
2712 * we are a copy. Otherwise we are either a
2713 * copy if the path stays, or a rename if it
2714 * does not, but we already handled "stays" case.
2715 */
2716 for (j = i + 1; j < q->nr; j++) {
2717 pp = q->queue[j];
2718 if (strcmp(pp->one->path, p->one->path))
2719 continue; /* not us */
2720 if (!DIFF_PAIR_RENAME(pp))
2721 continue; /* not a rename/copy */
2722 /* pp is a rename/copy from the same source */
2723 p->status = DIFF_STATUS_COPIED;
2724 break;
2725 }
2726 if (!p->status)
2727 p->status = DIFF_STATUS_RENAMED;
2728 }
2729 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2730 p->one->mode != p->two->mode ||
2731 is_null_sha1(p->one->sha1))
2732 p->status = DIFF_STATUS_MODIFIED;
2733 else {
2734 /* This is a "no-change" entry and should not
2735 * happen anymore, but prepare for broken callers.
2736 */
2737 error("feeding unmodified %s to diffcore",
2738 p->one->path);
2739 p->status = DIFF_STATUS_UNKNOWN;
2740 }
2741 }
2742 diff_debug_queue("resolve-rename-copy done", q);
2743 }
2744
2745 static int check_pair_status(struct diff_filepair *p)
2746 {
2747 switch (p->status) {
2748 case DIFF_STATUS_UNKNOWN:
2749 return 0;
2750 case 0:
2751 die("internal error in diff-resolve-rename-copy");
2752 default:
2753 return 1;
2754 }
2755 }
2756
2757 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2758 {
2759 int fmt = opt->output_format;
2760
2761 if (fmt & DIFF_FORMAT_CHECKDIFF)
2762 diff_flush_checkdiff(p, opt);
2763 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2764 diff_flush_raw(p, opt);
2765 else if (fmt & DIFF_FORMAT_NAME)
2766 diff_flush_name(p, opt);
2767 }
2768
2769 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2770 {
2771 char *name = quote_one(fs->path);
2772 if (fs->mode)
2773 printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
2774 else
2775 printf(" %s %s\n", newdelete, name);
2776 free(name);
2777 }
2778
2779
2780 static void show_mode_change(struct diff_filepair *p, int show_name)
2781 {
2782 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2783 if (show_name) {
2784 char *name = quote_one(p->two->path);
2785 printf(" mode change %06o => %06o %s\n",
2786 p->one->mode, p->two->mode, name);
2787 free(name);
2788 }
2789 else
2790 printf(" mode change %06o => %06o\n",
2791 p->one->mode, p->two->mode);
2792 }
2793 }
2794
2795 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2796 {
2797 char *names = pprint_rename(p->one->path, p->two->path);
2798
2799 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2800 free(names);
2801 show_mode_change(p, 0);
2802 }
2803
2804 static void diff_summary(struct diff_filepair *p)
2805 {
2806 switch(p->status) {
2807 case DIFF_STATUS_DELETED:
2808 show_file_mode_name("delete", p->one);
2809 break;
2810 case DIFF_STATUS_ADDED:
2811 show_file_mode_name("create", p->two);
2812 break;
2813 case DIFF_STATUS_COPIED:
2814 show_rename_copy("copy", p);
2815 break;
2816 case DIFF_STATUS_RENAMED:
2817 show_rename_copy("rename", p);
2818 break;
2819 default:
2820 if (p->score) {
2821 char *name = quote_one(p->two->path);
2822 printf(" rewrite %s (%d%%)\n", name,
2823 similarity_index(p));
2824 free(name);
2825 show_mode_change(p, 0);
2826 } else show_mode_change(p, 1);
2827 break;
2828 }
2829 }
2830
2831 struct patch_id_t {
2832 struct xdiff_emit_state xm;
2833 SHA_CTX *ctx;
2834 int patchlen;
2835 };
2836
2837 static int remove_space(char *line, int len)
2838 {
2839 int i;
2840 char *dst = line;
2841 unsigned char c;
2842
2843 for (i = 0; i < len; i++)
2844 if (!isspace((c = line[i])))
2845 *dst++ = c;
2846
2847 return dst - line;
2848 }
2849
2850 static void patch_id_consume(void *priv, char *line, unsigned long len)
2851 {
2852 struct patch_id_t *data = priv;
2853 int new_len;
2854
2855 /* Ignore line numbers when computing the SHA1 of the patch */
2856 if (!prefixcmp(line, "@@ -"))
2857 return;
2858
2859 new_len = remove_space(line, len);
2860
2861 SHA1_Update(data->ctx, line, new_len);
2862 data->patchlen += new_len;
2863 }
2864
2865 /* returns 0 upon success, and writes result into sha1 */
2866 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2867 {
2868 struct diff_queue_struct *q = &diff_queued_diff;
2869 int i;
2870 SHA_CTX ctx;
2871 struct patch_id_t data;
2872 char buffer[PATH_MAX * 4 + 20];
2873
2874 SHA1_Init(&ctx);
2875 memset(&data, 0, sizeof(struct patch_id_t));
2876 data.ctx = &ctx;
2877 data.xm.consume = patch_id_consume;
2878
2879 for (i = 0; i < q->nr; i++) {
2880 xpparam_t xpp;
2881 xdemitconf_t xecfg;
2882 xdemitcb_t ecb;
2883 mmfile_t mf1, mf2;
2884 struct diff_filepair *p = q->queue[i];
2885 int len1, len2;
2886
2887 memset(&xecfg, 0, sizeof(xecfg));
2888 if (p->status == 0)
2889 return error("internal diff status error");
2890 if (p->status == DIFF_STATUS_UNKNOWN)
2891 continue;
2892 if (diff_unmodified_pair(p))
2893 continue;
2894 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2895 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2896 continue;
2897 if (DIFF_PAIR_UNMERGED(p))
2898 continue;
2899
2900 diff_fill_sha1_info(p->one);
2901 diff_fill_sha1_info(p->two);
2902 if (fill_mmfile(&mf1, p->one) < 0 ||
2903 fill_mmfile(&mf2, p->two) < 0)
2904 return error("unable to read files to diff");
2905
2906 len1 = remove_space(p->one->path, strlen(p->one->path));
2907 len2 = remove_space(p->two->path, strlen(p->two->path));
2908 if (p->one->mode == 0)
2909 len1 = snprintf(buffer, sizeof(buffer),
2910 "diff--gita/%.*sb/%.*s"
2911 "newfilemode%06o"
2912 "---/dev/null"
2913 "+++b/%.*s",
2914 len1, p->one->path,
2915 len2, p->two->path,
2916 p->two->mode,
2917 len2, p->two->path);
2918 else if (p->two->mode == 0)
2919 len1 = snprintf(buffer, sizeof(buffer),
2920 "diff--gita/%.*sb/%.*s"
2921 "deletedfilemode%06o"
2922 "---a/%.*s"
2923 "+++/dev/null",
2924 len1, p->one->path,
2925 len2, p->two->path,
2926 p->one->mode,
2927 len1, p->one->path);
2928 else
2929 len1 = snprintf(buffer, sizeof(buffer),
2930 "diff--gita/%.*sb/%.*s"
2931 "---a/%.*s"
2932 "+++b/%.*s",
2933 len1, p->one->path,
2934 len2, p->two->path,
2935 len1, p->one->path,
2936 len2, p->two->path);
2937 SHA1_Update(&ctx, buffer, len1);
2938
2939 xpp.flags = XDF_NEED_MINIMAL;
2940 xecfg.ctxlen = 3;
2941 xecfg.flags = XDL_EMIT_FUNCNAMES;
2942 ecb.outf = xdiff_outf;
2943 ecb.priv = &data;
2944 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2945 }
2946
2947 SHA1_Final(sha1, &ctx);
2948 return 0;
2949 }
2950
2951 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2952 {
2953 struct diff_queue_struct *q = &diff_queued_diff;
2954 int i;
2955 int result = diff_get_patch_id(options, sha1);
2956
2957 for (i = 0; i < q->nr; i++)
2958 diff_free_filepair(q->queue[i]);
2959
2960 free(q->queue);
2961 q->queue = NULL;
2962 q->nr = q->alloc = 0;
2963
2964 return result;
2965 }
2966
2967 static int is_summary_empty(const struct diff_queue_struct *q)
2968 {
2969 int i;
2970
2971 for (i = 0; i < q->nr; i++) {
2972 const struct diff_filepair *p = q->queue[i];
2973
2974 switch (p->status) {
2975 case DIFF_STATUS_DELETED:
2976 case DIFF_STATUS_ADDED:
2977 case DIFF_STATUS_COPIED:
2978 case DIFF_STATUS_RENAMED:
2979 return 0;
2980 default:
2981 if (p->score)
2982 return 0;
2983 if (p->one->mode && p->two->mode &&
2984 p->one->mode != p->two->mode)
2985 return 0;
2986 break;
2987 }
2988 }
2989 return 1;
2990 }
2991
2992 void diff_flush(struct diff_options *options)
2993 {
2994 struct diff_queue_struct *q = &diff_queued_diff;
2995 int i, output_format = options->output_format;
2996 int separator = 0;
2997
2998 /*
2999 * Order: raw, stat, summary, patch
3000 * or: name/name-status/checkdiff (other bits clear)
3001 */
3002 if (!q->nr)
3003 goto free_queue;
3004
3005 if (output_format & (DIFF_FORMAT_RAW |
3006 DIFF_FORMAT_NAME |
3007 DIFF_FORMAT_NAME_STATUS |
3008 DIFF_FORMAT_CHECKDIFF)) {
3009 for (i = 0; i < q->nr; i++) {
3010 struct diff_filepair *p = q->queue[i];
3011 if (check_pair_status(p))
3012 flush_one_pair(p, options);
3013 }
3014 separator++;
3015 }
3016
3017 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3018 struct diffstat_t diffstat;
3019
3020 memset(&diffstat, 0, sizeof(struct diffstat_t));
3021 diffstat.xm.consume = diffstat_consume;
3022 for (i = 0; i < q->nr; i++) {
3023 struct diff_filepair *p = q->queue[i];
3024 if (check_pair_status(p))
3025 diff_flush_stat(p, options, &diffstat);
3026 }
3027 if (output_format & DIFF_FORMAT_NUMSTAT)
3028 show_numstat(&diffstat, options);
3029 if (output_format & DIFF_FORMAT_DIFFSTAT)
3030 show_stats(&diffstat, options);
3031 else if (output_format & DIFF_FORMAT_SHORTSTAT)
3032 show_shortstats(&diffstat);
3033 separator++;
3034 }
3035
3036 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3037 for (i = 0; i < q->nr; i++)
3038 diff_summary(q->queue[i]);
3039 separator++;
3040 }
3041
3042 if (output_format & DIFF_FORMAT_PATCH) {
3043 if (separator) {
3044 if (options->stat_sep) {
3045 /* attach patch instead of inline */
3046 fputs(options->stat_sep, stdout);
3047 } else {
3048 putchar(options->line_termination);
3049 }
3050 }
3051
3052 for (i = 0; i < q->nr; i++) {
3053 struct diff_filepair *p = q->queue[i];
3054 if (check_pair_status(p))
3055 diff_flush_patch(p, options);
3056 }
3057 }
3058
3059 if (output_format & DIFF_FORMAT_CALLBACK)
3060 options->format_callback(q, options, options->format_callback_data);
3061
3062 for (i = 0; i < q->nr; i++)
3063 diff_free_filepair(q->queue[i]);
3064 free_queue:
3065 free(q->queue);
3066 q->queue = NULL;
3067 q->nr = q->alloc = 0;
3068 }
3069
3070 static void diffcore_apply_filter(const char *filter)
3071 {
3072 int i;
3073 struct diff_queue_struct *q = &diff_queued_diff;
3074 struct diff_queue_struct outq;
3075 outq.queue = NULL;
3076 outq.nr = outq.alloc = 0;
3077
3078 if (!filter)
3079 return;
3080
3081 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3082 int found;
3083 for (i = found = 0; !found && i < q->nr; i++) {
3084 struct diff_filepair *p = q->queue[i];
3085 if (((p->status == DIFF_STATUS_MODIFIED) &&
3086 ((p->score &&
3087 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3088 (!p->score &&
3089 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3090 ((p->status != DIFF_STATUS_MODIFIED) &&
3091 strchr(filter, p->status)))
3092 found++;
3093 }
3094 if (found)
3095 return;
3096
3097 /* otherwise we will clear the whole queue
3098 * by copying the empty outq at the end of this
3099 * function, but first clear the current entries
3100 * in the queue.
3101 */
3102 for (i = 0; i < q->nr; i++)
3103 diff_free_filepair(q->queue[i]);
3104 }
3105 else {
3106 /* Only the matching ones */
3107 for (i = 0; i < q->nr; i++) {
3108 struct diff_filepair *p = q->queue[i];
3109
3110 if (((p->status == DIFF_STATUS_MODIFIED) &&
3111 ((p->score &&
3112 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3113 (!p->score &&
3114 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3115 ((p->status != DIFF_STATUS_MODIFIED) &&
3116 strchr(filter, p->status)))
3117 diff_q(&outq, p);
3118 else
3119 diff_free_filepair(p);
3120 }
3121 }
3122 free(q->queue);
3123 *q = outq;
3124 }
3125
3126 /* Check whether two filespecs with the same mode and size are identical */
3127 static int diff_filespec_is_identical(struct diff_filespec *one,
3128 struct diff_filespec *two)
3129 {
3130 if (S_ISGITLINK(one->mode)) {
3131 diff_fill_sha1_info(one);
3132 diff_fill_sha1_info(two);
3133 return !hashcmp(one->sha1, two->sha1);
3134 }
3135 if (diff_populate_filespec(one, 0))
3136 return 0;
3137 if (diff_populate_filespec(two, 0))
3138 return 0;
3139 return !memcmp(one->data, two->data, one->size);
3140 }
3141
3142 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3143 {
3144 int i;
3145 struct diff_queue_struct *q = &diff_queued_diff;
3146 struct diff_queue_struct outq;
3147 outq.queue = NULL;
3148 outq.nr = outq.alloc = 0;
3149
3150 for (i = 0; i < q->nr; i++) {
3151 struct diff_filepair *p = q->queue[i];
3152
3153 /*
3154 * 1. Entries that come from stat info dirtyness
3155 * always have both sides (iow, not create/delete),
3156 * one side of the object name is unknown, with
3157 * the same mode and size. Keep the ones that
3158 * do not match these criteria. They have real
3159 * differences.
3160 *
3161 * 2. At this point, the file is known to be modified,
3162 * with the same mode and size, and the object
3163 * name of one side is unknown. Need to inspect
3164 * the identical contents.
3165 */
3166 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3167 !DIFF_FILE_VALID(p->two) ||
3168 (p->one->sha1_valid && p->two->sha1_valid) ||
3169 (p->one->mode != p->two->mode) ||
3170 diff_populate_filespec(p->one, 1) ||
3171 diff_populate_filespec(p->two, 1) ||
3172 (p->one->size != p->two->size) ||
3173 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3174 diff_q(&outq, p);
3175 else {
3176 /*
3177 * The caller can subtract 1 from skip_stat_unmatch
3178 * to determine how many paths were dirty only
3179 * due to stat info mismatch.
3180 */
3181 if (!diffopt->no_index)
3182 diffopt->skip_stat_unmatch++;
3183 diff_free_filepair(p);
3184 }
3185 }
3186 free(q->queue);
3187 *q = outq;
3188 }
3189
3190 void diffcore_std(struct diff_options *options)
3191 {
3192 if (options->quiet)
3193 return;
3194
3195 if (options->skip_stat_unmatch && !options->find_copies_harder)
3196 diffcore_skip_stat_unmatch(options);
3197 if (options->break_opt != -1)
3198 diffcore_break(options->break_opt);
3199 if (options->detect_rename)
3200 diffcore_rename(options);
3201 if (options->break_opt != -1)
3202 diffcore_merge_broken();
3203 if (options->pickaxe)
3204 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3205 if (options->orderfile)
3206 diffcore_order(options->orderfile);
3207 diff_resolve_rename_copy();
3208 diffcore_apply_filter(options->filter);
3209
3210 options->has_changes = !!diff_queued_diff.nr;
3211 }
3212
3213
3214 void diff_addremove(struct diff_options *options,
3215 int addremove, unsigned mode,
3216 const unsigned char *sha1,
3217 const char *base, const char *path)
3218 {
3219 char concatpath[PATH_MAX];
3220 struct diff_filespec *one, *two;
3221
3222 /* This may look odd, but it is a preparation for
3223 * feeding "there are unchanged files which should
3224 * not produce diffs, but when you are doing copy
3225 * detection you would need them, so here they are"
3226 * entries to the diff-core. They will be prefixed
3227 * with something like '=' or '*' (I haven't decided
3228 * which but should not make any difference).
3229 * Feeding the same new and old to diff_change()
3230 * also has the same effect.
3231 * Before the final output happens, they are pruned after
3232 * merged into rename/copy pairs as appropriate.
3233 */
3234 if (options->reverse_diff)
3235 addremove = (addremove == '+' ? '-' :
3236 addremove == '-' ? '+' : addremove);
3237
3238 if (!path) path = "";
3239 sprintf(concatpath, "%s%s", base, path);
3240 one = alloc_filespec(concatpath);
3241 two = alloc_filespec(concatpath);
3242
3243 if (addremove != '+')
3244 fill_filespec(one, sha1, mode);
3245 if (addremove != '-')
3246 fill_filespec(two, sha1, mode);
3247
3248 diff_queue(&diff_queued_diff, one, two);
3249 options->has_changes = 1;
3250 }
3251
3252 void diff_change(struct diff_options *options,
3253 unsigned old_mode, unsigned new_mode,
3254 const unsigned char *old_sha1,
3255 const unsigned char *new_sha1,
3256 const char *base, const char *path)
3257 {
3258 char concatpath[PATH_MAX];
3259 struct diff_filespec *one, *two;
3260
3261 if (options->reverse_diff) {
3262 unsigned tmp;
3263 const unsigned char *tmp_c;
3264 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3265 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3266 }
3267 if (!path) path = "";
3268 sprintf(concatpath, "%s%s", base, path);
3269 one = alloc_filespec(concatpath);
3270 two = alloc_filespec(concatpath);
3271 fill_filespec(one, old_sha1, old_mode);
3272 fill_filespec(two, new_sha1, new_mode);
3273
3274 diff_queue(&diff_queued_diff, one, two);
3275 options->has_changes = 1;
3276 }
3277
3278 void diff_unmerge(struct diff_options *options,
3279 const char *path,
3280 unsigned mode, const unsigned char *sha1)
3281 {
3282 struct diff_filespec *one, *two;
3283 one = alloc_filespec(path);
3284 two = alloc_filespec(path);
3285 fill_filespec(one, sha1, mode);
3286 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3287 }
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