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git-svn: sort svk merge tickets to account for minimal parents
[git/gitweb.git] / diff.c
blobd952686926e2e97aab3e369ad192027b4d7e676b
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17
18 #ifdef NO_FAST_WORKING_DIRECTORY
19 #define FAST_WORKING_DIRECTORY 0
20 #else
21 #define FAST_WORKING_DIRECTORY 1
22 #endif
23
24 static int diff_detect_rename_default;
25 static int diff_rename_limit_default = 200;
26 static int diff_suppress_blank_empty;
27 int diff_use_color_default = -1;
28 static const char *diff_word_regex_cfg;
29 static const char *external_diff_cmd_cfg;
30 int diff_auto_refresh_index = 1;
31 static int diff_mnemonic_prefix;
32
33 static char diff_colors[][COLOR_MAXLEN] = {
34 GIT_COLOR_RESET,
35 GIT_COLOR_NORMAL, /* PLAIN */
36 GIT_COLOR_BOLD, /* METAINFO */
37 GIT_COLOR_CYAN, /* FRAGINFO */
38 GIT_COLOR_RED, /* OLD */
39 GIT_COLOR_GREEN, /* NEW */
40 GIT_COLOR_YELLOW, /* COMMIT */
41 GIT_COLOR_BG_RED, /* WHITESPACE */
42 GIT_COLOR_NORMAL, /* FUNCINFO */
43 };
44
45 static void diff_filespec_load_driver(struct diff_filespec *one);
46 static char *run_textconv(const char *, struct diff_filespec *, size_t *);
47
48 static int parse_diff_color_slot(const char *var, int ofs)
49 {
50 if (!strcasecmp(var+ofs, "plain"))
51 return DIFF_PLAIN;
52 if (!strcasecmp(var+ofs, "meta"))
53 return DIFF_METAINFO;
54 if (!strcasecmp(var+ofs, "frag"))
55 return DIFF_FRAGINFO;
56 if (!strcasecmp(var+ofs, "old"))
57 return DIFF_FILE_OLD;
58 if (!strcasecmp(var+ofs, "new"))
59 return DIFF_FILE_NEW;
60 if (!strcasecmp(var+ofs, "commit"))
61 return DIFF_COMMIT;
62 if (!strcasecmp(var+ofs, "whitespace"))
63 return DIFF_WHITESPACE;
64 if (!strcasecmp(var+ofs, "func"))
65 return DIFF_FUNCINFO;
66 die("bad config variable '%s'", var);
67 }
68
69 static int git_config_rename(const char *var, const char *value)
70 {
71 if (!value)
72 return DIFF_DETECT_RENAME;
73 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
74 return DIFF_DETECT_COPY;
75 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
76 }
77
78 /*
79 * These are to give UI layer defaults.
80 * The core-level commands such as git-diff-files should
81 * never be affected by the setting of diff.renames
82 * the user happens to have in the configuration file.
83 */
84 int git_diff_ui_config(const char *var, const char *value, void *cb)
85 {
86 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
87 diff_use_color_default = git_config_colorbool(var, value, -1);
88 return 0;
89 }
90 if (!strcmp(var, "diff.renames")) {
91 diff_detect_rename_default = git_config_rename(var, value);
92 return 0;
93 }
94 if (!strcmp(var, "diff.autorefreshindex")) {
95 diff_auto_refresh_index = git_config_bool(var, value);
96 return 0;
97 }
98 if (!strcmp(var, "diff.mnemonicprefix")) {
99 diff_mnemonic_prefix = git_config_bool(var, value);
100 return 0;
101 }
102 if (!strcmp(var, "diff.external"))
103 return git_config_string(&external_diff_cmd_cfg, var, value);
104 if (!strcmp(var, "diff.wordregex"))
105 return git_config_string(&diff_word_regex_cfg, var, value);
106
107 return git_diff_basic_config(var, value, cb);
108 }
109
110 int git_diff_basic_config(const char *var, const char *value, void *cb)
111 {
112 if (!strcmp(var, "diff.renamelimit")) {
113 diff_rename_limit_default = git_config_int(var, value);
114 return 0;
115 }
116
117 switch (userdiff_config(var, value)) {
118 case 0: break;
119 case -1: return -1;
120 default: return 0;
121 }
122
123 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
124 int slot = parse_diff_color_slot(var, 11);
125 if (!value)
126 return config_error_nonbool(var);
127 color_parse(value, var, diff_colors[slot]);
128 return 0;
129 }
130
131 /* like GNU diff's --suppress-blank-empty option */
132 if (!strcmp(var, "diff.suppressblankempty") ||
133 /* for backwards compatibility */
134 !strcmp(var, "diff.suppress-blank-empty")) {
135 diff_suppress_blank_empty = git_config_bool(var, value);
136 return 0;
137 }
138
139 return git_color_default_config(var, value, cb);
140 }
141
142 static char *quote_two(const char *one, const char *two)
143 {
144 int need_one = quote_c_style(one, NULL, NULL, 1);
145 int need_two = quote_c_style(two, NULL, NULL, 1);
146 struct strbuf res = STRBUF_INIT;
147
148 if (need_one + need_two) {
149 strbuf_addch(&res, '"');
150 quote_c_style(one, &res, NULL, 1);
151 quote_c_style(two, &res, NULL, 1);
152 strbuf_addch(&res, '"');
153 } else {
154 strbuf_addstr(&res, one);
155 strbuf_addstr(&res, two);
156 }
157 return strbuf_detach(&res, NULL);
158 }
159
160 static const char *external_diff(void)
161 {
162 static const char *external_diff_cmd = NULL;
163 static int done_preparing = 0;
164
165 if (done_preparing)
166 return external_diff_cmd;
167 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
168 if (!external_diff_cmd)
169 external_diff_cmd = external_diff_cmd_cfg;
170 done_preparing = 1;
171 return external_diff_cmd;
172 }
173
174 static struct diff_tempfile {
175 const char *name; /* filename external diff should read from */
176 char hex[41];
177 char mode[10];
178 char tmp_path[PATH_MAX];
179 } diff_temp[2];
180
181 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
182
183 struct emit_callback {
184 int color_diff;
185 unsigned ws_rule;
186 int blank_at_eof_in_preimage;
187 int blank_at_eof_in_postimage;
188 int lno_in_preimage;
189 int lno_in_postimage;
190 sane_truncate_fn truncate;
191 const char **label_path;
192 struct diff_words_data *diff_words;
193 int *found_changesp;
194 FILE *file;
195 };
196
197 static int count_lines(const char *data, int size)
198 {
199 int count, ch, completely_empty = 1, nl_just_seen = 0;
200 count = 0;
201 while (0 < size--) {
202 ch = *data++;
203 if (ch == '\n') {
204 count++;
205 nl_just_seen = 1;
206 completely_empty = 0;
207 }
208 else {
209 nl_just_seen = 0;
210 completely_empty = 0;
211 }
212 }
213 if (completely_empty)
214 return 0;
215 if (!nl_just_seen)
216 count++; /* no trailing newline */
217 return count;
218 }
219
220 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
221 {
222 if (!DIFF_FILE_VALID(one)) {
223 mf->ptr = (char *)""; /* does not matter */
224 mf->size = 0;
225 return 0;
226 }
227 else if (diff_populate_filespec(one, 0))
228 return -1;
229
230 mf->ptr = one->data;
231 mf->size = one->size;
232 return 0;
233 }
234
235 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
236 {
237 char *ptr = mf->ptr;
238 long size = mf->size;
239 int cnt = 0;
240
241 if (!size)
242 return cnt;
243 ptr += size - 1; /* pointing at the very end */
244 if (*ptr != '\n')
245 ; /* incomplete line */
246 else
247 ptr--; /* skip the last LF */
248 while (mf->ptr < ptr) {
249 char *prev_eol;
250 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
251 if (*prev_eol == '\n')
252 break;
253 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
254 break;
255 cnt++;
256 ptr = prev_eol - 1;
257 }
258 return cnt;
259 }
260
261 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
262 struct emit_callback *ecbdata)
263 {
264 int l1, l2, at;
265 unsigned ws_rule = ecbdata->ws_rule;
266 l1 = count_trailing_blank(mf1, ws_rule);
267 l2 = count_trailing_blank(mf2, ws_rule);
268 if (l2 <= l1) {
269 ecbdata->blank_at_eof_in_preimage = 0;
270 ecbdata->blank_at_eof_in_postimage = 0;
271 return;
272 }
273 at = count_lines(mf1->ptr, mf1->size);
274 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
275
276 at = count_lines(mf2->ptr, mf2->size);
277 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
278 }
279
280 static void emit_line_0(FILE *file, const char *set, const char *reset,
281 int first, const char *line, int len)
282 {
283 int has_trailing_newline, has_trailing_carriage_return;
284 int nofirst;
285
286 if (len == 0) {
287 has_trailing_newline = (first == '\n');
288 has_trailing_carriage_return = (!has_trailing_newline &&
289 (first == '\r'));
290 nofirst = has_trailing_newline || has_trailing_carriage_return;
291 } else {
292 has_trailing_newline = (len > 0 && line[len-1] == '\n');
293 if (has_trailing_newline)
294 len--;
295 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
296 if (has_trailing_carriage_return)
297 len--;
298 nofirst = 0;
299 }
300
301 if (len || !nofirst) {
302 fputs(set, file);
303 if (!nofirst)
304 fputc(first, file);
305 fwrite(line, len, 1, file);
306 fputs(reset, file);
307 }
308 if (has_trailing_carriage_return)
309 fputc('\r', file);
310 if (has_trailing_newline)
311 fputc('\n', file);
312 }
313
314 static void emit_line(FILE *file, const char *set, const char *reset,
315 const char *line, int len)
316 {
317 emit_line_0(file, set, reset, line[0], line+1, len-1);
318 }
319
320 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
321 {
322 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
323 ecbdata->blank_at_eof_in_preimage &&
324 ecbdata->blank_at_eof_in_postimage &&
325 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
326 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
327 return 0;
328 return ws_blank_line(line, len, ecbdata->ws_rule);
329 }
330
331 static void emit_add_line(const char *reset,
332 struct emit_callback *ecbdata,
333 const char *line, int len)
334 {
335 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
336 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
337
338 if (!*ws)
339 emit_line_0(ecbdata->file, set, reset, '+', line, len);
340 else if (new_blank_line_at_eof(ecbdata, line, len))
341 /* Blank line at EOF - paint '+' as well */
342 emit_line_0(ecbdata->file, ws, reset, '+', line, len);
343 else {
344 /* Emit just the prefix, then the rest. */
345 emit_line_0(ecbdata->file, set, reset, '+', "", 0);
346 ws_check_emit(line, len, ecbdata->ws_rule,
347 ecbdata->file, set, reset, ws);
348 }
349 }
350
351 static void emit_hunk_header(struct emit_callback *ecbdata,
352 const char *line, int len)
353 {
354 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
355 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
356 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
357 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
358 static const char atat[2] = { '@', '@' };
359 const char *cp, *ep;
360
361 /*
362 * As a hunk header must begin with "@@ -<old>, +<new> @@",
363 * it always is at least 10 bytes long.
364 */
365 if (len < 10 ||
366 memcmp(line, atat, 2) ||
367 !(ep = memmem(line + 2, len - 2, atat, 2))) {
368 emit_line(ecbdata->file, plain, reset, line, len);
369 return;
370 }
371 ep += 2; /* skip over @@ */
372
373 /* The hunk header in fraginfo color */
374 emit_line(ecbdata->file, frag, reset, line, ep - line);
375
376 /* blank before the func header */
377 for (cp = ep; ep - line < len; ep++)
378 if (*ep != ' ' && *ep != '\t')
379 break;
380 if (ep != cp)
381 emit_line(ecbdata->file, plain, reset, cp, ep - cp);
382
383 if (ep < line + len)
384 emit_line(ecbdata->file, func, reset, ep, line + len - ep);
385 }
386
387 static struct diff_tempfile *claim_diff_tempfile(void) {
388 int i;
389 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
390 if (!diff_temp[i].name)
391 return diff_temp + i;
392 die("BUG: diff is failing to clean up its tempfiles");
393 }
394
395 static int remove_tempfile_installed;
396
397 static void remove_tempfile(void)
398 {
399 int i;
400 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
401 if (diff_temp[i].name == diff_temp[i].tmp_path)
402 unlink_or_warn(diff_temp[i].name);
403 diff_temp[i].name = NULL;
404 }
405 }
406
407 static void remove_tempfile_on_signal(int signo)
408 {
409 remove_tempfile();
410 sigchain_pop(signo);
411 raise(signo);
412 }
413
414 static void print_line_count(FILE *file, int count)
415 {
416 switch (count) {
417 case 0:
418 fprintf(file, "0,0");
419 break;
420 case 1:
421 fprintf(file, "1");
422 break;
423 default:
424 fprintf(file, "1,%d", count);
425 break;
426 }
427 }
428
429 static void emit_rewrite_lines(struct emit_callback *ecb,
430 int prefix, const char *data, int size)
431 {
432 const char *endp = NULL;
433 static const char *nneof = " No newline at end of file\n";
434 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
435 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
436
437 while (0 < size) {
438 int len;
439
440 endp = memchr(data, '\n', size);
441 len = endp ? (endp - data + 1) : size;
442 if (prefix != '+') {
443 ecb->lno_in_preimage++;
444 emit_line_0(ecb->file, old, reset, '-',
445 data, len);
446 } else {
447 ecb->lno_in_postimage++;
448 emit_add_line(reset, ecb, data, len);
449 }
450 size -= len;
451 data += len;
452 }
453 if (!endp) {
454 const char *plain = diff_get_color(ecb->color_diff,
455 DIFF_PLAIN);
456 emit_line_0(ecb->file, plain, reset, '\\',
457 nneof, strlen(nneof));
458 }
459 }
460
461 static void emit_rewrite_diff(const char *name_a,
462 const char *name_b,
463 struct diff_filespec *one,
464 struct diff_filespec *two,
465 const char *textconv_one,
466 const char *textconv_two,
467 struct diff_options *o)
468 {
469 int lc_a, lc_b;
470 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
471 const char *name_a_tab, *name_b_tab;
472 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
473 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
474 const char *reset = diff_get_color(color_diff, DIFF_RESET);
475 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
476 const char *a_prefix, *b_prefix;
477 const char *data_one, *data_two;
478 size_t size_one, size_two;
479 struct emit_callback ecbdata;
480
481 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
482 a_prefix = o->b_prefix;
483 b_prefix = o->a_prefix;
484 } else {
485 a_prefix = o->a_prefix;
486 b_prefix = o->b_prefix;
487 }
488
489 name_a += (*name_a == '/');
490 name_b += (*name_b == '/');
491 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
492 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
493
494 strbuf_reset(&a_name);
495 strbuf_reset(&b_name);
496 quote_two_c_style(&a_name, a_prefix, name_a, 0);
497 quote_two_c_style(&b_name, b_prefix, name_b, 0);
498
499 diff_populate_filespec(one, 0);
500 diff_populate_filespec(two, 0);
501 if (textconv_one) {
502 data_one = run_textconv(textconv_one, one, &size_one);
503 if (!data_one)
504 die("unable to read files to diff");
505 }
506 else {
507 data_one = one->data;
508 size_one = one->size;
509 }
510 if (textconv_two) {
511 data_two = run_textconv(textconv_two, two, &size_two);
512 if (!data_two)
513 die("unable to read files to diff");
514 }
515 else {
516 data_two = two->data;
517 size_two = two->size;
518 }
519
520 memset(&ecbdata, 0, sizeof(ecbdata));
521 ecbdata.color_diff = color_diff;
522 ecbdata.found_changesp = &o->found_changes;
523 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
524 ecbdata.file = o->file;
525 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
526 mmfile_t mf1, mf2;
527 mf1.ptr = (char *)data_one;
528 mf2.ptr = (char *)data_two;
529 mf1.size = size_one;
530 mf2.size = size_two;
531 check_blank_at_eof(&mf1, &mf2, &ecbdata);
532 }
533 ecbdata.lno_in_preimage = 1;
534 ecbdata.lno_in_postimage = 1;
535
536 lc_a = count_lines(data_one, size_one);
537 lc_b = count_lines(data_two, size_two);
538 fprintf(o->file,
539 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
540 metainfo, a_name.buf, name_a_tab, reset,
541 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
542 print_line_count(o->file, lc_a);
543 fprintf(o->file, " +");
544 print_line_count(o->file, lc_b);
545 fprintf(o->file, " @@%s\n", reset);
546 if (lc_a)
547 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
548 if (lc_b)
549 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
550 }
551
552 struct diff_words_buffer {
553 mmfile_t text;
554 long alloc;
555 struct diff_words_orig {
556 const char *begin, *end;
557 } *orig;
558 int orig_nr, orig_alloc;
559 };
560
561 static void diff_words_append(char *line, unsigned long len,
562 struct diff_words_buffer *buffer)
563 {
564 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
565 line++;
566 len--;
567 memcpy(buffer->text.ptr + buffer->text.size, line, len);
568 buffer->text.size += len;
569 buffer->text.ptr[buffer->text.size] = '\0';
570 }
571
572 struct diff_words_data {
573 struct diff_words_buffer minus, plus;
574 const char *current_plus;
575 FILE *file;
576 regex_t *word_regex;
577 };
578
579 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
580 {
581 struct diff_words_data *diff_words = priv;
582 int minus_first, minus_len, plus_first, plus_len;
583 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
584
585 if (line[0] != '@' || parse_hunk_header(line, len,
586 &minus_first, &minus_len, &plus_first, &plus_len))
587 return;
588
589 /* POSIX requires that first be decremented by one if len == 0... */
590 if (minus_len) {
591 minus_begin = diff_words->minus.orig[minus_first].begin;
592 minus_end =
593 diff_words->minus.orig[minus_first + minus_len - 1].end;
594 } else
595 minus_begin = minus_end =
596 diff_words->minus.orig[minus_first].end;
597
598 if (plus_len) {
599 plus_begin = diff_words->plus.orig[plus_first].begin;
600 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
601 } else
602 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
603
604 if (diff_words->current_plus != plus_begin)
605 fwrite(diff_words->current_plus,
606 plus_begin - diff_words->current_plus, 1,
607 diff_words->file);
608 if (minus_begin != minus_end)
609 color_fwrite_lines(diff_words->file,
610 diff_get_color(1, DIFF_FILE_OLD),
611 minus_end - minus_begin, minus_begin);
612 if (plus_begin != plus_end)
613 color_fwrite_lines(diff_words->file,
614 diff_get_color(1, DIFF_FILE_NEW),
615 plus_end - plus_begin, plus_begin);
616
617 diff_words->current_plus = plus_end;
618 }
619
620 /* This function starts looking at *begin, and returns 0 iff a word was found. */
621 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
622 int *begin, int *end)
623 {
624 if (word_regex && *begin < buffer->size) {
625 regmatch_t match[1];
626 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
627 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
628 '\n', match[0].rm_eo - match[0].rm_so);
629 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
630 *begin += match[0].rm_so;
631 return *begin >= *end;
632 }
633 return -1;
634 }
635
636 /* find the next word */
637 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
638 (*begin)++;
639 if (*begin >= buffer->size)
640 return -1;
641
642 /* find the end of the word */
643 *end = *begin + 1;
644 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
645 (*end)++;
646
647 return 0;
648 }
649
650 /*
651 * This function splits the words in buffer->text, stores the list with
652 * newline separator into out, and saves the offsets of the original words
653 * in buffer->orig.
654 */
655 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
656 regex_t *word_regex)
657 {
658 int i, j;
659 long alloc = 0;
660
661 out->size = 0;
662 out->ptr = NULL;
663
664 /* fake an empty "0th" word */
665 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
666 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
667 buffer->orig_nr = 1;
668
669 for (i = 0; i < buffer->text.size; i++) {
670 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
671 return;
672
673 /* store original boundaries */
674 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
675 buffer->orig_alloc);
676 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
677 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
678 buffer->orig_nr++;
679
680 /* store one word */
681 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
682 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
683 out->ptr[out->size + j - i] = '\n';
684 out->size += j - i + 1;
685
686 i = j - 1;
687 }
688 }
689
690 /* this executes the word diff on the accumulated buffers */
691 static void diff_words_show(struct diff_words_data *diff_words)
692 {
693 xpparam_t xpp;
694 xdemitconf_t xecfg;
695 xdemitcb_t ecb;
696 mmfile_t minus, plus;
697
698 /* special case: only removal */
699 if (!diff_words->plus.text.size) {
700 color_fwrite_lines(diff_words->file,
701 diff_get_color(1, DIFF_FILE_OLD),
702 diff_words->minus.text.size, diff_words->minus.text.ptr);
703 diff_words->minus.text.size = 0;
704 return;
705 }
706
707 diff_words->current_plus = diff_words->plus.text.ptr;
708
709 memset(&xpp, 0, sizeof(xpp));
710 memset(&xecfg, 0, sizeof(xecfg));
711 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
712 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
713 xpp.flags = XDF_NEED_MINIMAL;
714 /* as only the hunk header will be parsed, we need a 0-context */
715 xecfg.ctxlen = 0;
716 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
717 &xpp, &xecfg, &ecb);
718 free(minus.ptr);
719 free(plus.ptr);
720 if (diff_words->current_plus != diff_words->plus.text.ptr +
721 diff_words->plus.text.size)
722 fwrite(diff_words->current_plus,
723 diff_words->plus.text.ptr + diff_words->plus.text.size
724 - diff_words->current_plus, 1,
725 diff_words->file);
726 diff_words->minus.text.size = diff_words->plus.text.size = 0;
727 }
728
729 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
730 static void diff_words_flush(struct emit_callback *ecbdata)
731 {
732 if (ecbdata->diff_words->minus.text.size ||
733 ecbdata->diff_words->plus.text.size)
734 diff_words_show(ecbdata->diff_words);
735 }
736
737 static void free_diff_words_data(struct emit_callback *ecbdata)
738 {
739 if (ecbdata->diff_words) {
740 diff_words_flush(ecbdata);
741 free (ecbdata->diff_words->minus.text.ptr);
742 free (ecbdata->diff_words->minus.orig);
743 free (ecbdata->diff_words->plus.text.ptr);
744 free (ecbdata->diff_words->plus.orig);
745 free(ecbdata->diff_words->word_regex);
746 free(ecbdata->diff_words);
747 ecbdata->diff_words = NULL;
748 }
749 }
750
751 const char *diff_get_color(int diff_use_color, enum color_diff ix)
752 {
753 if (diff_use_color)
754 return diff_colors[ix];
755 return "";
756 }
757
758 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
759 {
760 const char *cp;
761 unsigned long allot;
762 size_t l = len;
763
764 if (ecb->truncate)
765 return ecb->truncate(line, len);
766 cp = line;
767 allot = l;
768 while (0 < l) {
769 (void) utf8_width(&cp, &l);
770 if (!cp)
771 break; /* truncated in the middle? */
772 }
773 return allot - l;
774 }
775
776 static void find_lno(const char *line, struct emit_callback *ecbdata)
777 {
778 const char *p;
779 ecbdata->lno_in_preimage = 0;
780 ecbdata->lno_in_postimage = 0;
781 p = strchr(line, '-');
782 if (!p)
783 return; /* cannot happen */
784 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
785 p = strchr(p, '+');
786 if (!p)
787 return; /* cannot happen */
788 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
789 }
790
791 static void fn_out_consume(void *priv, char *line, unsigned long len)
792 {
793 struct emit_callback *ecbdata = priv;
794 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
795 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
796 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
797
798 *(ecbdata->found_changesp) = 1;
799
800 if (ecbdata->label_path[0]) {
801 const char *name_a_tab, *name_b_tab;
802
803 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
804 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
805
806 fprintf(ecbdata->file, "%s--- %s%s%s\n",
807 meta, ecbdata->label_path[0], reset, name_a_tab);
808 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
809 meta, ecbdata->label_path[1], reset, name_b_tab);
810 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
811 }
812
813 if (diff_suppress_blank_empty
814 && len == 2 && line[0] == ' ' && line[1] == '\n') {
815 line[0] = '\n';
816 len = 1;
817 }
818
819 if (line[0] == '@') {
820 if (ecbdata->diff_words)
821 diff_words_flush(ecbdata);
822 len = sane_truncate_line(ecbdata, line, len);
823 find_lno(line, ecbdata);
824 emit_hunk_header(ecbdata, line, len);
825 if (line[len-1] != '\n')
826 putc('\n', ecbdata->file);
827 return;
828 }
829
830 if (len < 1) {
831 emit_line(ecbdata->file, reset, reset, line, len);
832 return;
833 }
834
835 if (ecbdata->diff_words) {
836 if (line[0] == '-') {
837 diff_words_append(line, len,
838 &ecbdata->diff_words->minus);
839 return;
840 } else if (line[0] == '+') {
841 diff_words_append(line, len,
842 &ecbdata->diff_words->plus);
843 return;
844 }
845 diff_words_flush(ecbdata);
846 line++;
847 len--;
848 emit_line(ecbdata->file, plain, reset, line, len);
849 return;
850 }
851
852 if (line[0] != '+') {
853 const char *color =
854 diff_get_color(ecbdata->color_diff,
855 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
856 ecbdata->lno_in_preimage++;
857 if (line[0] == ' ')
858 ecbdata->lno_in_postimage++;
859 emit_line(ecbdata->file, color, reset, line, len);
860 } else {
861 ecbdata->lno_in_postimage++;
862 emit_add_line(reset, ecbdata, line + 1, len - 1);
863 }
864 }
865
866 static char *pprint_rename(const char *a, const char *b)
867 {
868 const char *old = a;
869 const char *new = b;
870 struct strbuf name = STRBUF_INIT;
871 int pfx_length, sfx_length;
872 int len_a = strlen(a);
873 int len_b = strlen(b);
874 int a_midlen, b_midlen;
875 int qlen_a = quote_c_style(a, NULL, NULL, 0);
876 int qlen_b = quote_c_style(b, NULL, NULL, 0);
877
878 if (qlen_a || qlen_b) {
879 quote_c_style(a, &name, NULL, 0);
880 strbuf_addstr(&name, " => ");
881 quote_c_style(b, &name, NULL, 0);
882 return strbuf_detach(&name, NULL);
883 }
884
885 /* Find common prefix */
886 pfx_length = 0;
887 while (*old && *new && *old == *new) {
888 if (*old == '/')
889 pfx_length = old - a + 1;
890 old++;
891 new++;
892 }
893
894 /* Find common suffix */
895 old = a + len_a;
896 new = b + len_b;
897 sfx_length = 0;
898 while (a <= old && b <= new && *old == *new) {
899 if (*old == '/')
900 sfx_length = len_a - (old - a);
901 old--;
902 new--;
903 }
904
905 /*
906 * pfx{mid-a => mid-b}sfx
907 * {pfx-a => pfx-b}sfx
908 * pfx{sfx-a => sfx-b}
909 * name-a => name-b
910 */
911 a_midlen = len_a - pfx_length - sfx_length;
912 b_midlen = len_b - pfx_length - sfx_length;
913 if (a_midlen < 0)
914 a_midlen = 0;
915 if (b_midlen < 0)
916 b_midlen = 0;
917
918 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
919 if (pfx_length + sfx_length) {
920 strbuf_add(&name, a, pfx_length);
921 strbuf_addch(&name, '{');
922 }
923 strbuf_add(&name, a + pfx_length, a_midlen);
924 strbuf_addstr(&name, " => ");
925 strbuf_add(&name, b + pfx_length, b_midlen);
926 if (pfx_length + sfx_length) {
927 strbuf_addch(&name, '}');
928 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
929 }
930 return strbuf_detach(&name, NULL);
931 }
932
933 struct diffstat_t {
934 int nr;
935 int alloc;
936 struct diffstat_file {
937 char *from_name;
938 char *name;
939 char *print_name;
940 unsigned is_unmerged:1;
941 unsigned is_binary:1;
942 unsigned is_renamed:1;
943 unsigned int added, deleted;
944 } **files;
945 };
946
947 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
948 const char *name_a,
949 const char *name_b)
950 {
951 struct diffstat_file *x;
952 x = xcalloc(sizeof (*x), 1);
953 if (diffstat->nr == diffstat->alloc) {
954 diffstat->alloc = alloc_nr(diffstat->alloc);
955 diffstat->files = xrealloc(diffstat->files,
956 diffstat->alloc * sizeof(x));
957 }
958 diffstat->files[diffstat->nr++] = x;
959 if (name_b) {
960 x->from_name = xstrdup(name_a);
961 x->name = xstrdup(name_b);
962 x->is_renamed = 1;
963 }
964 else {
965 x->from_name = NULL;
966 x->name = xstrdup(name_a);
967 }
968 return x;
969 }
970
971 static void diffstat_consume(void *priv, char *line, unsigned long len)
972 {
973 struct diffstat_t *diffstat = priv;
974 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
975
976 if (line[0] == '+')
977 x->added++;
978 else if (line[0] == '-')
979 x->deleted++;
980 }
981
982 const char mime_boundary_leader[] = "------------";
983
984 static int scale_linear(int it, int width, int max_change)
985 {
986 /*
987 * make sure that at least one '-' is printed if there were deletions,
988 * and likewise for '+'.
989 */
990 if (max_change < 2)
991 return it;
992 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
993 }
994
995 static void show_name(FILE *file,
996 const char *prefix, const char *name, int len)
997 {
998 fprintf(file, " %s%-*s |", prefix, len, name);
999 }
1000
1001 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1002 {
1003 if (cnt <= 0)
1004 return;
1005 fprintf(file, "%s", set);
1006 while (cnt--)
1007 putc(ch, file);
1008 fprintf(file, "%s", reset);
1009 }
1010
1011 static void fill_print_name(struct diffstat_file *file)
1012 {
1013 char *pname;
1014
1015 if (file->print_name)
1016 return;
1017
1018 if (!file->is_renamed) {
1019 struct strbuf buf = STRBUF_INIT;
1020 if (quote_c_style(file->name, &buf, NULL, 0)) {
1021 pname = strbuf_detach(&buf, NULL);
1022 } else {
1023 pname = file->name;
1024 strbuf_release(&buf);
1025 }
1026 } else {
1027 pname = pprint_rename(file->from_name, file->name);
1028 }
1029 file->print_name = pname;
1030 }
1031
1032 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1033 {
1034 int i, len, add, del, adds = 0, dels = 0;
1035 int max_change = 0, max_len = 0;
1036 int total_files = data->nr;
1037 int width, name_width;
1038 const char *reset, *set, *add_c, *del_c;
1039
1040 if (data->nr == 0)
1041 return;
1042
1043 width = options->stat_width ? options->stat_width : 80;
1044 name_width = options->stat_name_width ? options->stat_name_width : 50;
1045
1046 /* Sanity: give at least 5 columns to the graph,
1047 * but leave at least 10 columns for the name.
1048 */
1049 if (width < 25)
1050 width = 25;
1051 if (name_width < 10)
1052 name_width = 10;
1053 else if (width < name_width + 15)
1054 name_width = width - 15;
1055
1056 /* Find the longest filename and max number of changes */
1057 reset = diff_get_color_opt(options, DIFF_RESET);
1058 set = diff_get_color_opt(options, DIFF_PLAIN);
1059 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1060 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1061
1062 for (i = 0; i < data->nr; i++) {
1063 struct diffstat_file *file = data->files[i];
1064 int change = file->added + file->deleted;
1065 fill_print_name(file);
1066 len = strlen(file->print_name);
1067 if (max_len < len)
1068 max_len = len;
1069
1070 if (file->is_binary || file->is_unmerged)
1071 continue;
1072 if (max_change < change)
1073 max_change = change;
1074 }
1075
1076 /* Compute the width of the graph part;
1077 * 10 is for one blank at the beginning of the line plus
1078 * " | count " between the name and the graph.
1079 *
1080 * From here on, name_width is the width of the name area,
1081 * and width is the width of the graph area.
1082 */
1083 name_width = (name_width < max_len) ? name_width : max_len;
1084 if (width < (name_width + 10) + max_change)
1085 width = width - (name_width + 10);
1086 else
1087 width = max_change;
1088
1089 for (i = 0; i < data->nr; i++) {
1090 const char *prefix = "";
1091 char *name = data->files[i]->print_name;
1092 int added = data->files[i]->added;
1093 int deleted = data->files[i]->deleted;
1094 int name_len;
1095
1096 /*
1097 * "scale" the filename
1098 */
1099 len = name_width;
1100 name_len = strlen(name);
1101 if (name_width < name_len) {
1102 char *slash;
1103 prefix = "...";
1104 len -= 3;
1105 name += name_len - len;
1106 slash = strchr(name, '/');
1107 if (slash)
1108 name = slash;
1109 }
1110
1111 if (data->files[i]->is_binary) {
1112 show_name(options->file, prefix, name, len);
1113 fprintf(options->file, " Bin ");
1114 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
1115 fprintf(options->file, " -> ");
1116 fprintf(options->file, "%s%d%s", add_c, added, reset);
1117 fprintf(options->file, " bytes");
1118 fprintf(options->file, "\n");
1119 continue;
1120 }
1121 else if (data->files[i]->is_unmerged) {
1122 show_name(options->file, prefix, name, len);
1123 fprintf(options->file, " Unmerged\n");
1124 continue;
1125 }
1126 else if (!data->files[i]->is_renamed &&
1127 (added + deleted == 0)) {
1128 total_files--;
1129 continue;
1130 }
1131
1132 /*
1133 * scale the add/delete
1134 */
1135 add = added;
1136 del = deleted;
1137 adds += add;
1138 dels += del;
1139
1140 if (width <= max_change) {
1141 add = scale_linear(add, width, max_change);
1142 del = scale_linear(del, width, max_change);
1143 }
1144 show_name(options->file, prefix, name, len);
1145 fprintf(options->file, "%5d%s", added + deleted,
1146 added + deleted ? " " : "");
1147 show_graph(options->file, '+', add, add_c, reset);
1148 show_graph(options->file, '-', del, del_c, reset);
1149 fprintf(options->file, "\n");
1150 }
1151 fprintf(options->file,
1152 " %d files changed, %d insertions(+), %d deletions(-)\n",
1153 total_files, adds, dels);
1154 }
1155
1156 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1157 {
1158 int i, adds = 0, dels = 0, total_files = data->nr;
1159
1160 if (data->nr == 0)
1161 return;
1162
1163 for (i = 0; i < data->nr; i++) {
1164 if (!data->files[i]->is_binary &&
1165 !data->files[i]->is_unmerged) {
1166 int added = data->files[i]->added;
1167 int deleted= data->files[i]->deleted;
1168 if (!data->files[i]->is_renamed &&
1169 (added + deleted == 0)) {
1170 total_files--;
1171 } else {
1172 adds += added;
1173 dels += deleted;
1174 }
1175 }
1176 }
1177 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1178 total_files, adds, dels);
1179 }
1180
1181 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1182 {
1183 int i;
1184
1185 if (data->nr == 0)
1186 return;
1187
1188 for (i = 0; i < data->nr; i++) {
1189 struct diffstat_file *file = data->files[i];
1190
1191 if (file->is_binary)
1192 fprintf(options->file, "-\t-\t");
1193 else
1194 fprintf(options->file,
1195 "%d\t%d\t", file->added, file->deleted);
1196 if (options->line_termination) {
1197 fill_print_name(file);
1198 if (!file->is_renamed)
1199 write_name_quoted(file->name, options->file,
1200 options->line_termination);
1201 else {
1202 fputs(file->print_name, options->file);
1203 putc(options->line_termination, options->file);
1204 }
1205 } else {
1206 if (file->is_renamed) {
1207 putc('\0', options->file);
1208 write_name_quoted(file->from_name, options->file, '\0');
1209 }
1210 write_name_quoted(file->name, options->file, '\0');
1211 }
1212 }
1213 }
1214
1215 struct dirstat_file {
1216 const char *name;
1217 unsigned long changed;
1218 };
1219
1220 struct dirstat_dir {
1221 struct dirstat_file *files;
1222 int alloc, nr, percent, cumulative;
1223 };
1224
1225 static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
1226 {
1227 unsigned long this_dir = 0;
1228 unsigned int sources = 0;
1229
1230 while (dir->nr) {
1231 struct dirstat_file *f = dir->files;
1232 int namelen = strlen(f->name);
1233 unsigned long this;
1234 char *slash;
1235
1236 if (namelen < baselen)
1237 break;
1238 if (memcmp(f->name, base, baselen))
1239 break;
1240 slash = strchr(f->name + baselen, '/');
1241 if (slash) {
1242 int newbaselen = slash + 1 - f->name;
1243 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
1244 sources++;
1245 } else {
1246 this = f->changed;
1247 dir->files++;
1248 dir->nr--;
1249 sources += 2;
1250 }
1251 this_dir += this;
1252 }
1253
1254 /*
1255 * We don't report dirstat's for
1256 * - the top level
1257 * - or cases where everything came from a single directory
1258 * under this directory (sources == 1).
1259 */
1260 if (baselen && sources != 1) {
1261 int permille = this_dir * 1000 / changed;
1262 if (permille) {
1263 int percent = permille / 10;
1264 if (percent >= dir->percent) {
1265 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1266 if (!dir->cumulative)
1267 return 0;
1268 }
1269 }
1270 }
1271 return this_dir;
1272 }
1273
1274 static int dirstat_compare(const void *_a, const void *_b)
1275 {
1276 const struct dirstat_file *a = _a;
1277 const struct dirstat_file *b = _b;
1278 return strcmp(a->name, b->name);
1279 }
1280
1281 static void show_dirstat(struct diff_options *options)
1282 {
1283 int i;
1284 unsigned long changed;
1285 struct dirstat_dir dir;
1286 struct diff_queue_struct *q = &diff_queued_diff;
1287
1288 dir.files = NULL;
1289 dir.alloc = 0;
1290 dir.nr = 0;
1291 dir.percent = options->dirstat_percent;
1292 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1293
1294 changed = 0;
1295 for (i = 0; i < q->nr; i++) {
1296 struct diff_filepair *p = q->queue[i];
1297 const char *name;
1298 unsigned long copied, added, damage;
1299
1300 name = p->one->path ? p->one->path : p->two->path;
1301
1302 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1303 diff_populate_filespec(p->one, 0);
1304 diff_populate_filespec(p->two, 0);
1305 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1306 &copied, &added);
1307 diff_free_filespec_data(p->one);
1308 diff_free_filespec_data(p->two);
1309 } else if (DIFF_FILE_VALID(p->one)) {
1310 diff_populate_filespec(p->one, 1);
1311 copied = added = 0;
1312 diff_free_filespec_data(p->one);
1313 } else if (DIFF_FILE_VALID(p->two)) {
1314 diff_populate_filespec(p->two, 1);
1315 copied = 0;
1316 added = p->two->size;
1317 diff_free_filespec_data(p->two);
1318 } else
1319 continue;
1320
1321 /*
1322 * Original minus copied is the removed material,
1323 * added is the new material. They are both damages
1324 * made to the preimage. In --dirstat-by-file mode, count
1325 * damaged files, not damaged lines. This is done by
1326 * counting only a single damaged line per file.
1327 */
1328 damage = (p->one->size - copied) + added;
1329 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1330 damage = 1;
1331
1332 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1333 dir.files[dir.nr].name = name;
1334 dir.files[dir.nr].changed = damage;
1335 changed += damage;
1336 dir.nr++;
1337 }
1338
1339 /* This can happen even with many files, if everything was renames */
1340 if (!changed)
1341 return;
1342
1343 /* Show all directories with more than x% of the changes */
1344 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1345 gather_dirstat(options->file, &dir, changed, "", 0);
1346 }
1347
1348 static void free_diffstat_info(struct diffstat_t *diffstat)
1349 {
1350 int i;
1351 for (i = 0; i < diffstat->nr; i++) {
1352 struct diffstat_file *f = diffstat->files[i];
1353 if (f->name != f->print_name)
1354 free(f->print_name);
1355 free(f->name);
1356 free(f->from_name);
1357 free(f);
1358 }
1359 free(diffstat->files);
1360 }
1361
1362 struct checkdiff_t {
1363 const char *filename;
1364 int lineno;
1365 struct diff_options *o;
1366 unsigned ws_rule;
1367 unsigned status;
1368 };
1369
1370 static int is_conflict_marker(const char *line, unsigned long len)
1371 {
1372 char firstchar;
1373 int cnt;
1374
1375 if (len < 8)
1376 return 0;
1377 firstchar = line[0];
1378 switch (firstchar) {
1379 case '=': case '>': case '<':
1380 break;
1381 default:
1382 return 0;
1383 }
1384 for (cnt = 1; cnt < 7; cnt++)
1385 if (line[cnt] != firstchar)
1386 return 0;
1387 /* line[0] thru line[6] are same as firstchar */
1388 if (firstchar == '=') {
1389 /* divider between ours and theirs? */
1390 if (len != 8 || line[7] != '\n')
1391 return 0;
1392 } else if (len < 8 || !isspace(line[7])) {
1393 /* not divider before ours nor after theirs */
1394 return 0;
1395 }
1396 return 1;
1397 }
1398
1399 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1400 {
1401 struct checkdiff_t *data = priv;
1402 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1403 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1404 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1405 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1406 char *err;
1407
1408 if (line[0] == '+') {
1409 unsigned bad;
1410 data->lineno++;
1411 if (is_conflict_marker(line + 1, len - 1)) {
1412 data->status |= 1;
1413 fprintf(data->o->file,
1414 "%s:%d: leftover conflict marker\n",
1415 data->filename, data->lineno);
1416 }
1417 bad = ws_check(line + 1, len - 1, data->ws_rule);
1418 if (!bad)
1419 return;
1420 data->status |= bad;
1421 err = whitespace_error_string(bad);
1422 fprintf(data->o->file, "%s:%d: %s.\n",
1423 data->filename, data->lineno, err);
1424 free(err);
1425 emit_line(data->o->file, set, reset, line, 1);
1426 ws_check_emit(line + 1, len - 1, data->ws_rule,
1427 data->o->file, set, reset, ws);
1428 } else if (line[0] == ' ') {
1429 data->lineno++;
1430 } else if (line[0] == '@') {
1431 char *plus = strchr(line, '+');
1432 if (plus)
1433 data->lineno = strtol(plus, NULL, 10) - 1;
1434 else
1435 die("invalid diff");
1436 }
1437 }
1438
1439 static unsigned char *deflate_it(char *data,
1440 unsigned long size,
1441 unsigned long *result_size)
1442 {
1443 int bound;
1444 unsigned char *deflated;
1445 z_stream stream;
1446
1447 memset(&stream, 0, sizeof(stream));
1448 deflateInit(&stream, zlib_compression_level);
1449 bound = deflateBound(&stream, size);
1450 deflated = xmalloc(bound);
1451 stream.next_out = deflated;
1452 stream.avail_out = bound;
1453
1454 stream.next_in = (unsigned char *)data;
1455 stream.avail_in = size;
1456 while (deflate(&stream, Z_FINISH) == Z_OK)
1457 ; /* nothing */
1458 deflateEnd(&stream);
1459 *result_size = stream.total_out;
1460 return deflated;
1461 }
1462
1463 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
1464 {
1465 void *cp;
1466 void *delta;
1467 void *deflated;
1468 void *data;
1469 unsigned long orig_size;
1470 unsigned long delta_size;
1471 unsigned long deflate_size;
1472 unsigned long data_size;
1473
1474 /* We could do deflated delta, or we could do just deflated two,
1475 * whichever is smaller.
1476 */
1477 delta = NULL;
1478 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1479 if (one->size && two->size) {
1480 delta = diff_delta(one->ptr, one->size,
1481 two->ptr, two->size,
1482 &delta_size, deflate_size);
1483 if (delta) {
1484 void *to_free = delta;
1485 orig_size = delta_size;
1486 delta = deflate_it(delta, delta_size, &delta_size);
1487 free(to_free);
1488 }
1489 }
1490
1491 if (delta && delta_size < deflate_size) {
1492 fprintf(file, "delta %lu\n", orig_size);
1493 free(deflated);
1494 data = delta;
1495 data_size = delta_size;
1496 }
1497 else {
1498 fprintf(file, "literal %lu\n", two->size);
1499 free(delta);
1500 data = deflated;
1501 data_size = deflate_size;
1502 }
1503
1504 /* emit data encoded in base85 */
1505 cp = data;
1506 while (data_size) {
1507 int bytes = (52 < data_size) ? 52 : data_size;
1508 char line[70];
1509 data_size -= bytes;
1510 if (bytes <= 26)
1511 line[0] = bytes + 'A' - 1;
1512 else
1513 line[0] = bytes - 26 + 'a' - 1;
1514 encode_85(line + 1, cp, bytes);
1515 cp = (char *) cp + bytes;
1516 fputs(line, file);
1517 fputc('\n', file);
1518 }
1519 fprintf(file, "\n");
1520 free(data);
1521 }
1522
1523 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
1524 {
1525 fprintf(file, "GIT binary patch\n");
1526 emit_binary_diff_body(file, one, two);
1527 emit_binary_diff_body(file, two, one);
1528 }
1529
1530 static void diff_filespec_load_driver(struct diff_filespec *one)
1531 {
1532 if (!one->driver)
1533 one->driver = userdiff_find_by_path(one->path);
1534 if (!one->driver)
1535 one->driver = userdiff_find_by_name("default");
1536 }
1537
1538 int diff_filespec_is_binary(struct diff_filespec *one)
1539 {
1540 if (one->is_binary == -1) {
1541 diff_filespec_load_driver(one);
1542 if (one->driver->binary != -1)
1543 one->is_binary = one->driver->binary;
1544 else {
1545 if (!one->data && DIFF_FILE_VALID(one))
1546 diff_populate_filespec(one, 0);
1547 if (one->data)
1548 one->is_binary = buffer_is_binary(one->data,
1549 one->size);
1550 if (one->is_binary == -1)
1551 one->is_binary = 0;
1552 }
1553 }
1554 return one->is_binary;
1555 }
1556
1557 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1558 {
1559 diff_filespec_load_driver(one);
1560 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1561 }
1562
1563 static const char *userdiff_word_regex(struct diff_filespec *one)
1564 {
1565 diff_filespec_load_driver(one);
1566 return one->driver->word_regex;
1567 }
1568
1569 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1570 {
1571 if (!options->a_prefix)
1572 options->a_prefix = a;
1573 if (!options->b_prefix)
1574 options->b_prefix = b;
1575 }
1576
1577 static const char *get_textconv(struct diff_filespec *one)
1578 {
1579 if (!DIFF_FILE_VALID(one))
1580 return NULL;
1581 if (!S_ISREG(one->mode))
1582 return NULL;
1583 diff_filespec_load_driver(one);
1584 return one->driver->textconv;
1585 }
1586
1587 static void builtin_diff(const char *name_a,
1588 const char *name_b,
1589 struct diff_filespec *one,
1590 struct diff_filespec *two,
1591 const char *xfrm_msg,
1592 struct diff_options *o,
1593 int complete_rewrite)
1594 {
1595 mmfile_t mf1, mf2;
1596 const char *lbl[2];
1597 char *a_one, *b_two;
1598 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1599 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1600 const char *a_prefix, *b_prefix;
1601 const char *textconv_one = NULL, *textconv_two = NULL;
1602
1603 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
1604 (!one->mode || S_ISGITLINK(one->mode)) &&
1605 (!two->mode || S_ISGITLINK(two->mode))) {
1606 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
1607 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
1608 show_submodule_summary(o->file, one ? one->path : two->path,
1609 one->sha1, two->sha1,
1610 del, add, reset);
1611 return;
1612 }
1613
1614 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1615 textconv_one = get_textconv(one);
1616 textconv_two = get_textconv(two);
1617 }
1618
1619 diff_set_mnemonic_prefix(o, "a/", "b/");
1620 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1621 a_prefix = o->b_prefix;
1622 b_prefix = o->a_prefix;
1623 } else {
1624 a_prefix = o->a_prefix;
1625 b_prefix = o->b_prefix;
1626 }
1627
1628 /* Never use a non-valid filename anywhere if at all possible */
1629 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1630 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1631
1632 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1633 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1634 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1635 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1636 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1637 if (lbl[0][0] == '/') {
1638 /* /dev/null */
1639 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
1640 if (xfrm_msg && xfrm_msg[0])
1641 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1642 }
1643 else if (lbl[1][0] == '/') {
1644 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1645 if (xfrm_msg && xfrm_msg[0])
1646 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1647 }
1648 else {
1649 if (one->mode != two->mode) {
1650 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1651 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
1652 }
1653 if (xfrm_msg && xfrm_msg[0])
1654 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1655 /*
1656 * we do not run diff between different kind
1657 * of objects.
1658 */
1659 if ((one->mode ^ two->mode) & S_IFMT)
1660 goto free_ab_and_return;
1661 if (complete_rewrite &&
1662 (textconv_one || !diff_filespec_is_binary(one)) &&
1663 (textconv_two || !diff_filespec_is_binary(two))) {
1664 emit_rewrite_diff(name_a, name_b, one, two,
1665 textconv_one, textconv_two, o);
1666 o->found_changes = 1;
1667 goto free_ab_and_return;
1668 }
1669 }
1670
1671 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1672 die("unable to read files to diff");
1673
1674 if (!DIFF_OPT_TST(o, TEXT) &&
1675 ( (diff_filespec_is_binary(one) && !textconv_one) ||
1676 (diff_filespec_is_binary(two) && !textconv_two) )) {
1677 /* Quite common confusing case */
1678 if (mf1.size == mf2.size &&
1679 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1680 goto free_ab_and_return;
1681 if (DIFF_OPT_TST(o, BINARY))
1682 emit_binary_diff(o->file, &mf1, &mf2);
1683 else
1684 fprintf(o->file, "Binary files %s and %s differ\n",
1685 lbl[0], lbl[1]);
1686 o->found_changes = 1;
1687 }
1688 else {
1689 /* Crazy xdl interfaces.. */
1690 const char *diffopts = getenv("GIT_DIFF_OPTS");
1691 xpparam_t xpp;
1692 xdemitconf_t xecfg;
1693 xdemitcb_t ecb;
1694 struct emit_callback ecbdata;
1695 const struct userdiff_funcname *pe;
1696
1697 if (textconv_one) {
1698 size_t size;
1699 mf1.ptr = run_textconv(textconv_one, one, &size);
1700 if (!mf1.ptr)
1701 die("unable to read files to diff");
1702 mf1.size = size;
1703 }
1704 if (textconv_two) {
1705 size_t size;
1706 mf2.ptr = run_textconv(textconv_two, two, &size);
1707 if (!mf2.ptr)
1708 die("unable to read files to diff");
1709 mf2.size = size;
1710 }
1711
1712 pe = diff_funcname_pattern(one);
1713 if (!pe)
1714 pe = diff_funcname_pattern(two);
1715
1716 memset(&xpp, 0, sizeof(xpp));
1717 memset(&xecfg, 0, sizeof(xecfg));
1718 memset(&ecbdata, 0, sizeof(ecbdata));
1719 ecbdata.label_path = lbl;
1720 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1721 ecbdata.found_changesp = &o->found_changes;
1722 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1723 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
1724 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1725 ecbdata.file = o->file;
1726 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1727 xecfg.ctxlen = o->context;
1728 xecfg.interhunkctxlen = o->interhunkcontext;
1729 xecfg.flags = XDL_EMIT_FUNCNAMES;
1730 if (pe)
1731 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1732 if (!diffopts)
1733 ;
1734 else if (!prefixcmp(diffopts, "--unified="))
1735 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1736 else if (!prefixcmp(diffopts, "-u"))
1737 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1738 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1739 ecbdata.diff_words =
1740 xcalloc(1, sizeof(struct diff_words_data));
1741 ecbdata.diff_words->file = o->file;
1742 if (!o->word_regex)
1743 o->word_regex = userdiff_word_regex(one);
1744 if (!o->word_regex)
1745 o->word_regex = userdiff_word_regex(two);
1746 if (!o->word_regex)
1747 o->word_regex = diff_word_regex_cfg;
1748 if (o->word_regex) {
1749 ecbdata.diff_words->word_regex = (regex_t *)
1750 xmalloc(sizeof(regex_t));
1751 if (regcomp(ecbdata.diff_words->word_regex,
1752 o->word_regex,
1753 REG_EXTENDED | REG_NEWLINE))
1754 die ("Invalid regular expression: %s",
1755 o->word_regex);
1756 }
1757 }
1758 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
1759 &xpp, &xecfg, &ecb);
1760 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1761 free_diff_words_data(&ecbdata);
1762 if (textconv_one)
1763 free(mf1.ptr);
1764 if (textconv_two)
1765 free(mf2.ptr);
1766 xdiff_clear_find_func(&xecfg);
1767 }
1768
1769 free_ab_and_return:
1770 diff_free_filespec_data(one);
1771 diff_free_filespec_data(two);
1772 free(a_one);
1773 free(b_two);
1774 return;
1775 }
1776
1777 static void builtin_diffstat(const char *name_a, const char *name_b,
1778 struct diff_filespec *one,
1779 struct diff_filespec *two,
1780 struct diffstat_t *diffstat,
1781 struct diff_options *o,
1782 int complete_rewrite)
1783 {
1784 mmfile_t mf1, mf2;
1785 struct diffstat_file *data;
1786
1787 data = diffstat_add(diffstat, name_a, name_b);
1788
1789 if (!one || !two) {
1790 data->is_unmerged = 1;
1791 return;
1792 }
1793 if (complete_rewrite) {
1794 diff_populate_filespec(one, 0);
1795 diff_populate_filespec(two, 0);
1796 data->deleted = count_lines(one->data, one->size);
1797 data->added = count_lines(two->data, two->size);
1798 goto free_and_return;
1799 }
1800 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1801 die("unable to read files to diff");
1802
1803 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1804 data->is_binary = 1;
1805 data->added = mf2.size;
1806 data->deleted = mf1.size;
1807 } else {
1808 /* Crazy xdl interfaces.. */
1809 xpparam_t xpp;
1810 xdemitconf_t xecfg;
1811 xdemitcb_t ecb;
1812
1813 memset(&xpp, 0, sizeof(xpp));
1814 memset(&xecfg, 0, sizeof(xecfg));
1815 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1816 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
1817 &xpp, &xecfg, &ecb);
1818 }
1819
1820 free_and_return:
1821 diff_free_filespec_data(one);
1822 diff_free_filespec_data(two);
1823 }
1824
1825 static void builtin_checkdiff(const char *name_a, const char *name_b,
1826 const char *attr_path,
1827 struct diff_filespec *one,
1828 struct diff_filespec *two,
1829 struct diff_options *o)
1830 {
1831 mmfile_t mf1, mf2;
1832 struct checkdiff_t data;
1833
1834 if (!two)
1835 return;
1836
1837 memset(&data, 0, sizeof(data));
1838 data.filename = name_b ? name_b : name_a;
1839 data.lineno = 0;
1840 data.o = o;
1841 data.ws_rule = whitespace_rule(attr_path);
1842
1843 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1844 die("unable to read files to diff");
1845
1846 /*
1847 * All the other codepaths check both sides, but not checking
1848 * the "old" side here is deliberate. We are checking the newly
1849 * introduced changes, and as long as the "new" side is text, we
1850 * can and should check what it introduces.
1851 */
1852 if (diff_filespec_is_binary(two))
1853 goto free_and_return;
1854 else {
1855 /* Crazy xdl interfaces.. */
1856 xpparam_t xpp;
1857 xdemitconf_t xecfg;
1858 xdemitcb_t ecb;
1859
1860 memset(&xpp, 0, sizeof(xpp));
1861 memset(&xecfg, 0, sizeof(xecfg));
1862 xecfg.ctxlen = 1; /* at least one context line */
1863 xpp.flags = XDF_NEED_MINIMAL;
1864 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
1865 &xpp, &xecfg, &ecb);
1866
1867 if (data.ws_rule & WS_BLANK_AT_EOF) {
1868 struct emit_callback ecbdata;
1869 int blank_at_eof;
1870
1871 ecbdata.ws_rule = data.ws_rule;
1872 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1873 blank_at_eof = ecbdata.blank_at_eof_in_preimage;
1874
1875 if (blank_at_eof) {
1876 static char *err;
1877 if (!err)
1878 err = whitespace_error_string(WS_BLANK_AT_EOF);
1879 fprintf(o->file, "%s:%d: %s.\n",
1880 data.filename, blank_at_eof, err);
1881 data.status = 1; /* report errors */
1882 }
1883 }
1884 }
1885 free_and_return:
1886 diff_free_filespec_data(one);
1887 diff_free_filespec_data(two);
1888 if (data.status)
1889 DIFF_OPT_SET(o, CHECK_FAILED);
1890 }
1891
1892 struct diff_filespec *alloc_filespec(const char *path)
1893 {
1894 int namelen = strlen(path);
1895 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1896
1897 memset(spec, 0, sizeof(*spec));
1898 spec->path = (char *)(spec + 1);
1899 memcpy(spec->path, path, namelen+1);
1900 spec->count = 1;
1901 spec->is_binary = -1;
1902 return spec;
1903 }
1904
1905 void free_filespec(struct diff_filespec *spec)
1906 {
1907 if (!--spec->count) {
1908 diff_free_filespec_data(spec);
1909 free(spec);
1910 }
1911 }
1912
1913 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1914 unsigned short mode)
1915 {
1916 if (mode) {
1917 spec->mode = canon_mode(mode);
1918 hashcpy(spec->sha1, sha1);
1919 spec->sha1_valid = !is_null_sha1(sha1);
1920 }
1921 }
1922
1923 /*
1924 * Given a name and sha1 pair, if the index tells us the file in
1925 * the work tree has that object contents, return true, so that
1926 * prepare_temp_file() does not have to inflate and extract.
1927 */
1928 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1929 {
1930 struct cache_entry *ce;
1931 struct stat st;
1932 int pos, len;
1933
1934 /*
1935 * We do not read the cache ourselves here, because the
1936 * benchmark with my previous version that always reads cache
1937 * shows that it makes things worse for diff-tree comparing
1938 * two linux-2.6 kernel trees in an already checked out work
1939 * tree. This is because most diff-tree comparisons deal with
1940 * only a small number of files, while reading the cache is
1941 * expensive for a large project, and its cost outweighs the
1942 * savings we get by not inflating the object to a temporary
1943 * file. Practically, this code only helps when we are used
1944 * by diff-cache --cached, which does read the cache before
1945 * calling us.
1946 */
1947 if (!active_cache)
1948 return 0;
1949
1950 /* We want to avoid the working directory if our caller
1951 * doesn't need the data in a normal file, this system
1952 * is rather slow with its stat/open/mmap/close syscalls,
1953 * and the object is contained in a pack file. The pack
1954 * is probably already open and will be faster to obtain
1955 * the data through than the working directory. Loose
1956 * objects however would tend to be slower as they need
1957 * to be individually opened and inflated.
1958 */
1959 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
1960 return 0;
1961
1962 len = strlen(name);
1963 pos = cache_name_pos(name, len);
1964 if (pos < 0)
1965 return 0;
1966 ce = active_cache[pos];
1967
1968 /*
1969 * This is not the sha1 we are looking for, or
1970 * unreusable because it is not a regular file.
1971 */
1972 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1973 return 0;
1974
1975 /*
1976 * If ce is marked as "assume unchanged", there is no
1977 * guarantee that work tree matches what we are looking for.
1978 */
1979 if (ce->ce_flags & CE_VALID)
1980 return 0;
1981
1982 /*
1983 * If ce matches the file in the work tree, we can reuse it.
1984 */
1985 if (ce_uptodate(ce) ||
1986 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1987 return 1;
1988
1989 return 0;
1990 }
1991
1992 static int populate_from_stdin(struct diff_filespec *s)
1993 {
1994 struct strbuf buf = STRBUF_INIT;
1995 size_t size = 0;
1996
1997 if (strbuf_read(&buf, 0, 0) < 0)
1998 return error("error while reading from stdin %s",
1999 strerror(errno));
2000
2001 s->should_munmap = 0;
2002 s->data = strbuf_detach(&buf, &size);
2003 s->size = size;
2004 s->should_free = 1;
2005 return 0;
2006 }
2007
2008 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2009 {
2010 int len;
2011 char *data = xmalloc(100);
2012 len = snprintf(data, 100,
2013 "Subproject commit %s\n", sha1_to_hex(s->sha1));
2014 s->data = data;
2015 s->size = len;
2016 s->should_free = 1;
2017 if (size_only) {
2018 s->data = NULL;
2019 free(data);
2020 }
2021 return 0;
2022 }
2023
2024 /*
2025 * While doing rename detection and pickaxe operation, we may need to
2026 * grab the data for the blob (or file) for our own in-core comparison.
2027 * diff_filespec has data and size fields for this purpose.
2028 */
2029 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2030 {
2031 int err = 0;
2032 if (!DIFF_FILE_VALID(s))
2033 die("internal error: asking to populate invalid file.");
2034 if (S_ISDIR(s->mode))
2035 return -1;
2036
2037 if (s->data)
2038 return 0;
2039
2040 if (size_only && 0 < s->size)
2041 return 0;
2042
2043 if (S_ISGITLINK(s->mode))
2044 return diff_populate_gitlink(s, size_only);
2045
2046 if (!s->sha1_valid ||
2047 reuse_worktree_file(s->path, s->sha1, 0)) {
2048 struct strbuf buf = STRBUF_INIT;
2049 struct stat st;
2050 int fd;
2051
2052 if (!strcmp(s->path, "-"))
2053 return populate_from_stdin(s);
2054
2055 if (lstat(s->path, &st) < 0) {
2056 if (errno == ENOENT) {
2057 err_empty:
2058 err = -1;
2059 empty:
2060 s->data = (char *)"";
2061 s->size = 0;
2062 return err;
2063 }
2064 }
2065 s->size = xsize_t(st.st_size);
2066 if (!s->size)
2067 goto empty;
2068 if (S_ISLNK(st.st_mode)) {
2069 struct strbuf sb = STRBUF_INIT;
2070
2071 if (strbuf_readlink(&sb, s->path, s->size))
2072 goto err_empty;
2073 s->size = sb.len;
2074 s->data = strbuf_detach(&sb, NULL);
2075 s->should_free = 1;
2076 return 0;
2077 }
2078 if (size_only)
2079 return 0;
2080 fd = open(s->path, O_RDONLY);
2081 if (fd < 0)
2082 goto err_empty;
2083 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2084 close(fd);
2085 s->should_munmap = 1;
2086
2087 /*
2088 * Convert from working tree format to canonical git format
2089 */
2090 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2091 size_t size = 0;
2092 munmap(s->data, s->size);
2093 s->should_munmap = 0;
2094 s->data = strbuf_detach(&buf, &size);
2095 s->size = size;
2096 s->should_free = 1;
2097 }
2098 }
2099 else {
2100 enum object_type type;
2101 if (size_only)
2102 type = sha1_object_info(s->sha1, &s->size);
2103 else {
2104 s->data = read_sha1_file(s->sha1, &type, &s->size);
2105 s->should_free = 1;
2106 }
2107 }
2108 return 0;
2109 }
2110
2111 void diff_free_filespec_blob(struct diff_filespec *s)
2112 {
2113 if (s->should_free)
2114 free(s->data);
2115 else if (s->should_munmap)
2116 munmap(s->data, s->size);
2117
2118 if (s->should_free || s->should_munmap) {
2119 s->should_free = s->should_munmap = 0;
2120 s->data = NULL;
2121 }
2122 }
2123
2124 void diff_free_filespec_data(struct diff_filespec *s)
2125 {
2126 diff_free_filespec_blob(s);
2127 free(s->cnt_data);
2128 s->cnt_data = NULL;
2129 }
2130
2131 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2132 void *blob,
2133 unsigned long size,
2134 const unsigned char *sha1,
2135 int mode)
2136 {
2137 int fd;
2138 struct strbuf buf = STRBUF_INIT;
2139 struct strbuf template = STRBUF_INIT;
2140 char *path_dup = xstrdup(path);
2141 const char *base = basename(path_dup);
2142
2143 /* Generate "XXXXXX_basename.ext" */
2144 strbuf_addstr(&template, "XXXXXX_");
2145 strbuf_addstr(&template, base);
2146
2147 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2148 strlen(base) + 1);
2149 if (fd < 0)
2150 die_errno("unable to create temp-file");
2151 if (convert_to_working_tree(path,
2152 (const char *)blob, (size_t)size, &buf)) {
2153 blob = buf.buf;
2154 size = buf.len;
2155 }
2156 if (write_in_full(fd, blob, size) != size)
2157 die_errno("unable to write temp-file");
2158 close(fd);
2159 temp->name = temp->tmp_path;
2160 strcpy(temp->hex, sha1_to_hex(sha1));
2161 temp->hex[40] = 0;
2162 sprintf(temp->mode, "%06o", mode);
2163 strbuf_release(&buf);
2164 strbuf_release(&template);
2165 free(path_dup);
2166 }
2167
2168 static struct diff_tempfile *prepare_temp_file(const char *name,
2169 struct diff_filespec *one)
2170 {
2171 struct diff_tempfile *temp = claim_diff_tempfile();
2172
2173 if (!DIFF_FILE_VALID(one)) {
2174 not_a_valid_file:
2175 /* A '-' entry produces this for file-2, and
2176 * a '+' entry produces this for file-1.
2177 */
2178 temp->name = "/dev/null";
2179 strcpy(temp->hex, ".");
2180 strcpy(temp->mode, ".");
2181 return temp;
2182 }
2183
2184 if (!remove_tempfile_installed) {
2185 atexit(remove_tempfile);
2186 sigchain_push_common(remove_tempfile_on_signal);
2187 remove_tempfile_installed = 1;
2188 }
2189
2190 if (!one->sha1_valid ||
2191 reuse_worktree_file(name, one->sha1, 1)) {
2192 struct stat st;
2193 if (lstat(name, &st) < 0) {
2194 if (errno == ENOENT)
2195 goto not_a_valid_file;
2196 die_errno("stat(%s)", name);
2197 }
2198 if (S_ISLNK(st.st_mode)) {
2199 struct strbuf sb = STRBUF_INIT;
2200 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2201 die_errno("readlink(%s)", name);
2202 prep_temp_blob(name, temp, sb.buf, sb.len,
2203 (one->sha1_valid ?
2204 one->sha1 : null_sha1),
2205 (one->sha1_valid ?
2206 one->mode : S_IFLNK));
2207 strbuf_release(&sb);
2208 }
2209 else {
2210 /* we can borrow from the file in the work tree */
2211 temp->name = name;
2212 if (!one->sha1_valid)
2213 strcpy(temp->hex, sha1_to_hex(null_sha1));
2214 else
2215 strcpy(temp->hex, sha1_to_hex(one->sha1));
2216 /* Even though we may sometimes borrow the
2217 * contents from the work tree, we always want
2218 * one->mode. mode is trustworthy even when
2219 * !(one->sha1_valid), as long as
2220 * DIFF_FILE_VALID(one).
2221 */
2222 sprintf(temp->mode, "%06o", one->mode);
2223 }
2224 return temp;
2225 }
2226 else {
2227 if (diff_populate_filespec(one, 0))
2228 die("cannot read data blob for %s", one->path);
2229 prep_temp_blob(name, temp, one->data, one->size,
2230 one->sha1, one->mode);
2231 }
2232 return temp;
2233 }
2234
2235 /* An external diff command takes:
2236 *
2237 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2238 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2239 *
2240 */
2241 static void run_external_diff(const char *pgm,
2242 const char *name,
2243 const char *other,
2244 struct diff_filespec *one,
2245 struct diff_filespec *two,
2246 const char *xfrm_msg,
2247 int complete_rewrite)
2248 {
2249 const char *spawn_arg[10];
2250 int retval;
2251 const char **arg = &spawn_arg[0];
2252
2253 if (one && two) {
2254 struct diff_tempfile *temp_one, *temp_two;
2255 const char *othername = (other ? other : name);
2256 temp_one = prepare_temp_file(name, one);
2257 temp_two = prepare_temp_file(othername, two);
2258 *arg++ = pgm;
2259 *arg++ = name;
2260 *arg++ = temp_one->name;
2261 *arg++ = temp_one->hex;
2262 *arg++ = temp_one->mode;
2263 *arg++ = temp_two->name;
2264 *arg++ = temp_two->hex;
2265 *arg++ = temp_two->mode;
2266 if (other) {
2267 *arg++ = other;
2268 *arg++ = xfrm_msg;
2269 }
2270 } else {
2271 *arg++ = pgm;
2272 *arg++ = name;
2273 }
2274 *arg = NULL;
2275 fflush(NULL);
2276 retval = run_command_v_opt(spawn_arg, 0);
2277 remove_tempfile();
2278 if (retval) {
2279 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2280 exit(1);
2281 }
2282 }
2283
2284 static int similarity_index(struct diff_filepair *p)
2285 {
2286 return p->score * 100 / MAX_SCORE;
2287 }
2288
2289 static void fill_metainfo(struct strbuf *msg,
2290 const char *name,
2291 const char *other,
2292 struct diff_filespec *one,
2293 struct diff_filespec *two,
2294 struct diff_options *o,
2295 struct diff_filepair *p)
2296 {
2297 strbuf_init(msg, PATH_MAX * 2 + 300);
2298 switch (p->status) {
2299 case DIFF_STATUS_COPIED:
2300 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2301 strbuf_addstr(msg, "\ncopy from ");
2302 quote_c_style(name, msg, NULL, 0);
2303 strbuf_addstr(msg, "\ncopy to ");
2304 quote_c_style(other, msg, NULL, 0);
2305 strbuf_addch(msg, '\n');
2306 break;
2307 case DIFF_STATUS_RENAMED:
2308 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2309 strbuf_addstr(msg, "\nrename from ");
2310 quote_c_style(name, msg, NULL, 0);
2311 strbuf_addstr(msg, "\nrename to ");
2312 quote_c_style(other, msg, NULL, 0);
2313 strbuf_addch(msg, '\n');
2314 break;
2315 case DIFF_STATUS_MODIFIED:
2316 if (p->score) {
2317 strbuf_addf(msg, "dissimilarity index %d%%\n",
2318 similarity_index(p));
2319 break;
2320 }
2321 /* fallthru */
2322 default:
2323 /* nothing */
2324 ;
2325 }
2326 if (one && two && hashcmp(one->sha1, two->sha1)) {
2327 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2328
2329 if (DIFF_OPT_TST(o, BINARY)) {
2330 mmfile_t mf;
2331 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2332 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2333 abbrev = 40;
2334 }
2335 strbuf_addf(msg, "index %.*s..%.*s",
2336 abbrev, sha1_to_hex(one->sha1),
2337 abbrev, sha1_to_hex(two->sha1));
2338 if (one->mode == two->mode)
2339 strbuf_addf(msg, " %06o", one->mode);
2340 strbuf_addch(msg, '\n');
2341 }
2342 if (msg->len)
2343 strbuf_setlen(msg, msg->len - 1);
2344 }
2345
2346 static void run_diff_cmd(const char *pgm,
2347 const char *name,
2348 const char *other,
2349 const char *attr_path,
2350 struct diff_filespec *one,
2351 struct diff_filespec *two,
2352 struct strbuf *msg,
2353 struct diff_options *o,
2354 struct diff_filepair *p)
2355 {
2356 const char *xfrm_msg = NULL;
2357 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2358
2359 if (msg) {
2360 fill_metainfo(msg, name, other, one, two, o, p);
2361 xfrm_msg = msg->len ? msg->buf : NULL;
2362 }
2363
2364 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2365 pgm = NULL;
2366 else {
2367 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2368 if (drv && drv->external)
2369 pgm = drv->external;
2370 }
2371
2372 if (pgm) {
2373 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2374 complete_rewrite);
2375 return;
2376 }
2377 if (one && two)
2378 builtin_diff(name, other ? other : name,
2379 one, two, xfrm_msg, o, complete_rewrite);
2380 else
2381 fprintf(o->file, "* Unmerged path %s\n", name);
2382 }
2383
2384 static void diff_fill_sha1_info(struct diff_filespec *one)
2385 {
2386 if (DIFF_FILE_VALID(one)) {
2387 if (!one->sha1_valid) {
2388 struct stat st;
2389 if (!strcmp(one->path, "-")) {
2390 hashcpy(one->sha1, null_sha1);
2391 return;
2392 }
2393 if (lstat(one->path, &st) < 0)
2394 die_errno("stat '%s'", one->path);
2395 if (index_path(one->sha1, one->path, &st, 0))
2396 die("cannot hash %s", one->path);
2397 }
2398 }
2399 else
2400 hashclr(one->sha1);
2401 }
2402
2403 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2404 {
2405 /* Strip the prefix but do not molest /dev/null and absolute paths */
2406 if (*namep && **namep != '/')
2407 *namep += prefix_length;
2408 if (*otherp && **otherp != '/')
2409 *otherp += prefix_length;
2410 }
2411
2412 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2413 {
2414 const char *pgm = external_diff();
2415 struct strbuf msg;
2416 struct diff_filespec *one = p->one;
2417 struct diff_filespec *two = p->two;
2418 const char *name;
2419 const char *other;
2420 const char *attr_path;
2421
2422 name = p->one->path;
2423 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2424 attr_path = name;
2425 if (o->prefix_length)
2426 strip_prefix(o->prefix_length, &name, &other);
2427
2428 if (DIFF_PAIR_UNMERGED(p)) {
2429 run_diff_cmd(pgm, name, NULL, attr_path,
2430 NULL, NULL, NULL, o, p);
2431 return;
2432 }
2433
2434 diff_fill_sha1_info(one);
2435 diff_fill_sha1_info(two);
2436
2437 if (!pgm &&
2438 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2439 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2440 /*
2441 * a filepair that changes between file and symlink
2442 * needs to be split into deletion and creation.
2443 */
2444 struct diff_filespec *null = alloc_filespec(two->path);
2445 run_diff_cmd(NULL, name, other, attr_path,
2446 one, null, &msg, o, p);
2447 free(null);
2448 strbuf_release(&msg);
2449
2450 null = alloc_filespec(one->path);
2451 run_diff_cmd(NULL, name, other, attr_path,
2452 null, two, &msg, o, p);
2453 free(null);
2454 }
2455 else
2456 run_diff_cmd(pgm, name, other, attr_path,
2457 one, two, &msg, o, p);
2458
2459 strbuf_release(&msg);
2460 }
2461
2462 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2463 struct diffstat_t *diffstat)
2464 {
2465 const char *name;
2466 const char *other;
2467 int complete_rewrite = 0;
2468
2469 if (DIFF_PAIR_UNMERGED(p)) {
2470 /* unmerged */
2471 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2472 return;
2473 }
2474
2475 name = p->one->path;
2476 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2477
2478 if (o->prefix_length)
2479 strip_prefix(o->prefix_length, &name, &other);
2480
2481 diff_fill_sha1_info(p->one);
2482 diff_fill_sha1_info(p->two);
2483
2484 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2485 complete_rewrite = 1;
2486 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2487 }
2488
2489 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2490 {
2491 const char *name;
2492 const char *other;
2493 const char *attr_path;
2494
2495 if (DIFF_PAIR_UNMERGED(p)) {
2496 /* unmerged */
2497 return;
2498 }
2499
2500 name = p->one->path;
2501 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2502 attr_path = other ? other : name;
2503
2504 if (o->prefix_length)
2505 strip_prefix(o->prefix_length, &name, &other);
2506
2507 diff_fill_sha1_info(p->one);
2508 diff_fill_sha1_info(p->two);
2509
2510 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2511 }
2512
2513 void diff_setup(struct diff_options *options)
2514 {
2515 memset(options, 0, sizeof(*options));
2516
2517 options->file = stdout;
2518
2519 options->line_termination = '\n';
2520 options->break_opt = -1;
2521 options->rename_limit = -1;
2522 options->dirstat_percent = 3;
2523 options->context = 3;
2524
2525 options->change = diff_change;
2526 options->add_remove = diff_addremove;
2527 if (diff_use_color_default > 0)
2528 DIFF_OPT_SET(options, COLOR_DIFF);
2529 options->detect_rename = diff_detect_rename_default;
2530
2531 if (!diff_mnemonic_prefix) {
2532 options->a_prefix = "a/";
2533 options->b_prefix = "b/";
2534 }
2535 }
2536
2537 int diff_setup_done(struct diff_options *options)
2538 {
2539 int count = 0;
2540
2541 if (options->output_format & DIFF_FORMAT_NAME)
2542 count++;
2543 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2544 count++;
2545 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2546 count++;
2547 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2548 count++;
2549 if (count > 1)
2550 die("--name-only, --name-status, --check and -s are mutually exclusive");
2551
2552 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2553 options->detect_rename = DIFF_DETECT_COPY;
2554
2555 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2556 options->prefix = NULL;
2557 if (options->prefix)
2558 options->prefix_length = strlen(options->prefix);
2559 else
2560 options->prefix_length = 0;
2561
2562 if (options->output_format & (DIFF_FORMAT_NAME |
2563 DIFF_FORMAT_NAME_STATUS |
2564 DIFF_FORMAT_CHECKDIFF |
2565 DIFF_FORMAT_NO_OUTPUT))
2566 options->output_format &= ~(DIFF_FORMAT_RAW |
2567 DIFF_FORMAT_NUMSTAT |
2568 DIFF_FORMAT_DIFFSTAT |
2569 DIFF_FORMAT_SHORTSTAT |
2570 DIFF_FORMAT_DIRSTAT |
2571 DIFF_FORMAT_SUMMARY |
2572 DIFF_FORMAT_PATCH);
2573
2574 /*
2575 * These cases always need recursive; we do not drop caller-supplied
2576 * recursive bits for other formats here.
2577 */
2578 if (options->output_format & (DIFF_FORMAT_PATCH |
2579 DIFF_FORMAT_NUMSTAT |
2580 DIFF_FORMAT_DIFFSTAT |
2581 DIFF_FORMAT_SHORTSTAT |
2582 DIFF_FORMAT_DIRSTAT |
2583 DIFF_FORMAT_SUMMARY |
2584 DIFF_FORMAT_CHECKDIFF))
2585 DIFF_OPT_SET(options, RECURSIVE);
2586 /*
2587 * Also pickaxe would not work very well if you do not say recursive
2588 */
2589 if (options->pickaxe)
2590 DIFF_OPT_SET(options, RECURSIVE);
2591
2592 if (options->detect_rename && options->rename_limit < 0)
2593 options->rename_limit = diff_rename_limit_default;
2594 if (options->setup & DIFF_SETUP_USE_CACHE) {
2595 if (!active_cache)
2596 /* read-cache does not die even when it fails
2597 * so it is safe for us to do this here. Also
2598 * it does not smudge active_cache or active_nr
2599 * when it fails, so we do not have to worry about
2600 * cleaning it up ourselves either.
2601 */
2602 read_cache();
2603 }
2604 if (options->abbrev <= 0 || 40 < options->abbrev)
2605 options->abbrev = 40; /* full */
2606
2607 /*
2608 * It does not make sense to show the first hit we happened
2609 * to have found. It does not make sense not to return with
2610 * exit code in such a case either.
2611 */
2612 if (DIFF_OPT_TST(options, QUIET)) {
2613 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2614 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2615 }
2616
2617 return 0;
2618 }
2619
2620 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2621 {
2622 char c, *eq;
2623 int len;
2624
2625 if (*arg != '-')
2626 return 0;
2627 c = *++arg;
2628 if (!c)
2629 return 0;
2630 if (c == arg_short) {
2631 c = *++arg;
2632 if (!c)
2633 return 1;
2634 if (val && isdigit(c)) {
2635 char *end;
2636 int n = strtoul(arg, &end, 10);
2637 if (*end)
2638 return 0;
2639 *val = n;
2640 return 1;
2641 }
2642 return 0;
2643 }
2644 if (c != '-')
2645 return 0;
2646 arg++;
2647 eq = strchr(arg, '=');
2648 if (eq)
2649 len = eq - arg;
2650 else
2651 len = strlen(arg);
2652 if (!len || strncmp(arg, arg_long, len))
2653 return 0;
2654 if (eq) {
2655 int n;
2656 char *end;
2657 if (!isdigit(*++eq))
2658 return 0;
2659 n = strtoul(eq, &end, 10);
2660 if (*end)
2661 return 0;
2662 *val = n;
2663 }
2664 return 1;
2665 }
2666
2667 static int diff_scoreopt_parse(const char *opt);
2668
2669 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2670 {
2671 const char *arg = av[0];
2672
2673 /* Output format options */
2674 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2675 options->output_format |= DIFF_FORMAT_PATCH;
2676 else if (opt_arg(arg, 'U', "unified", &options->context))
2677 options->output_format |= DIFF_FORMAT_PATCH;
2678 else if (!strcmp(arg, "--raw"))
2679 options->output_format |= DIFF_FORMAT_RAW;
2680 else if (!strcmp(arg, "--patch-with-raw"))
2681 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2682 else if (!strcmp(arg, "--numstat"))
2683 options->output_format |= DIFF_FORMAT_NUMSTAT;
2684 else if (!strcmp(arg, "--shortstat"))
2685 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2686 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2687 options->output_format |= DIFF_FORMAT_DIRSTAT;
2688 else if (!strcmp(arg, "--cumulative")) {
2689 options->output_format |= DIFF_FORMAT_DIRSTAT;
2690 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
2691 } else if (opt_arg(arg, 0, "dirstat-by-file",
2692 &options->dirstat_percent)) {
2693 options->output_format |= DIFF_FORMAT_DIRSTAT;
2694 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
2695 }
2696 else if (!strcmp(arg, "--check"))
2697 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2698 else if (!strcmp(arg, "--summary"))
2699 options->output_format |= DIFF_FORMAT_SUMMARY;
2700 else if (!strcmp(arg, "--patch-with-stat"))
2701 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2702 else if (!strcmp(arg, "--name-only"))
2703 options->output_format |= DIFF_FORMAT_NAME;
2704 else if (!strcmp(arg, "--name-status"))
2705 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2706 else if (!strcmp(arg, "-s"))
2707 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2708 else if (!prefixcmp(arg, "--stat")) {
2709 char *end;
2710 int width = options->stat_width;
2711 int name_width = options->stat_name_width;
2712 arg += 6;
2713 end = (char *)arg;
2714
2715 switch (*arg) {
2716 case '-':
2717 if (!prefixcmp(arg, "-width="))
2718 width = strtoul(arg + 7, &end, 10);
2719 else if (!prefixcmp(arg, "-name-width="))
2720 name_width = strtoul(arg + 12, &end, 10);
2721 break;
2722 case '=':
2723 width = strtoul(arg+1, &end, 10);
2724 if (*end == ',')
2725 name_width = strtoul(end+1, &end, 10);
2726 }
2727
2728 /* Important! This checks all the error cases! */
2729 if (*end)
2730 return 0;
2731 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2732 options->stat_name_width = name_width;
2733 options->stat_width = width;
2734 }
2735
2736 /* renames options */
2737 else if (!prefixcmp(arg, "-B")) {
2738 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2739 return -1;
2740 }
2741 else if (!prefixcmp(arg, "-M")) {
2742 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2743 return -1;
2744 options->detect_rename = DIFF_DETECT_RENAME;
2745 }
2746 else if (!prefixcmp(arg, "-C")) {
2747 if (options->detect_rename == DIFF_DETECT_COPY)
2748 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2749 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2750 return -1;
2751 options->detect_rename = DIFF_DETECT_COPY;
2752 }
2753 else if (!strcmp(arg, "--no-renames"))
2754 options->detect_rename = 0;
2755 else if (!strcmp(arg, "--relative"))
2756 DIFF_OPT_SET(options, RELATIVE_NAME);
2757 else if (!prefixcmp(arg, "--relative=")) {
2758 DIFF_OPT_SET(options, RELATIVE_NAME);
2759 options->prefix = arg + 11;
2760 }
2761
2762 /* xdiff options */
2763 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2764 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
2765 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2766 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
2767 else if (!strcmp(arg, "--ignore-space-at-eol"))
2768 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
2769 else if (!strcmp(arg, "--patience"))
2770 DIFF_XDL_SET(options, PATIENCE_DIFF);
2771
2772 /* flags options */
2773 else if (!strcmp(arg, "--binary")) {
2774 options->output_format |= DIFF_FORMAT_PATCH;
2775 DIFF_OPT_SET(options, BINARY);
2776 }
2777 else if (!strcmp(arg, "--full-index"))
2778 DIFF_OPT_SET(options, FULL_INDEX);
2779 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2780 DIFF_OPT_SET(options, TEXT);
2781 else if (!strcmp(arg, "-R"))
2782 DIFF_OPT_SET(options, REVERSE_DIFF);
2783 else if (!strcmp(arg, "--find-copies-harder"))
2784 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2785 else if (!strcmp(arg, "--follow"))
2786 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2787 else if (!strcmp(arg, "--color"))
2788 DIFF_OPT_SET(options, COLOR_DIFF);
2789 else if (!strcmp(arg, "--no-color"))
2790 DIFF_OPT_CLR(options, COLOR_DIFF);
2791 else if (!strcmp(arg, "--color-words")) {
2792 DIFF_OPT_SET(options, COLOR_DIFF);
2793 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2794 }
2795 else if (!prefixcmp(arg, "--color-words=")) {
2796 DIFF_OPT_SET(options, COLOR_DIFF);
2797 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2798 options->word_regex = arg + 14;
2799 }
2800 else if (!strcmp(arg, "--exit-code"))
2801 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2802 else if (!strcmp(arg, "--quiet"))
2803 DIFF_OPT_SET(options, QUIET);
2804 else if (!strcmp(arg, "--ext-diff"))
2805 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2806 else if (!strcmp(arg, "--no-ext-diff"))
2807 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2808 else if (!strcmp(arg, "--textconv"))
2809 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
2810 else if (!strcmp(arg, "--no-textconv"))
2811 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
2812 else if (!strcmp(arg, "--ignore-submodules"))
2813 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2814 else if (!strcmp(arg, "--submodule"))
2815 DIFF_OPT_SET(options, SUBMODULE_LOG);
2816 else if (!prefixcmp(arg, "--submodule=")) {
2817 if (!strcmp(arg + 12, "log"))
2818 DIFF_OPT_SET(options, SUBMODULE_LOG);
2819 }
2820
2821 /* misc options */
2822 else if (!strcmp(arg, "-z"))
2823 options->line_termination = 0;
2824 else if (!prefixcmp(arg, "-l"))
2825 options->rename_limit = strtoul(arg+2, NULL, 10);
2826 else if (!prefixcmp(arg, "-S"))
2827 options->pickaxe = arg + 2;
2828 else if (!strcmp(arg, "--pickaxe-all"))
2829 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2830 else if (!strcmp(arg, "--pickaxe-regex"))
2831 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2832 else if (!prefixcmp(arg, "-O"))
2833 options->orderfile = arg + 2;
2834 else if (!prefixcmp(arg, "--diff-filter="))
2835 options->filter = arg + 14;
2836 else if (!strcmp(arg, "--abbrev"))
2837 options->abbrev = DEFAULT_ABBREV;
2838 else if (!prefixcmp(arg, "--abbrev=")) {
2839 options->abbrev = strtoul(arg + 9, NULL, 10);
2840 if (options->abbrev < MINIMUM_ABBREV)
2841 options->abbrev = MINIMUM_ABBREV;
2842 else if (40 < options->abbrev)
2843 options->abbrev = 40;
2844 }
2845 else if (!prefixcmp(arg, "--src-prefix="))
2846 options->a_prefix = arg + 13;
2847 else if (!prefixcmp(arg, "--dst-prefix="))
2848 options->b_prefix = arg + 13;
2849 else if (!strcmp(arg, "--no-prefix"))
2850 options->a_prefix = options->b_prefix = "";
2851 else if (opt_arg(arg, '\0', "inter-hunk-context",
2852 &options->interhunkcontext))
2853 ;
2854 else if (!prefixcmp(arg, "--output=")) {
2855 options->file = fopen(arg + strlen("--output="), "w");
2856 options->close_file = 1;
2857 } else
2858 return 0;
2859 return 1;
2860 }
2861
2862 static int parse_num(const char **cp_p)
2863 {
2864 unsigned long num, scale;
2865 int ch, dot;
2866 const char *cp = *cp_p;
2867
2868 num = 0;
2869 scale = 1;
2870 dot = 0;
2871 for (;;) {
2872 ch = *cp;
2873 if ( !dot && ch == '.' ) {
2874 scale = 1;
2875 dot = 1;
2876 } else if ( ch == '%' ) {
2877 scale = dot ? scale*100 : 100;
2878 cp++; /* % is always at the end */
2879 break;
2880 } else if ( ch >= '0' && ch <= '9' ) {
2881 if ( scale < 100000 ) {
2882 scale *= 10;
2883 num = (num*10) + (ch-'0');
2884 }
2885 } else {
2886 break;
2887 }
2888 cp++;
2889 }
2890 *cp_p = cp;
2891
2892 /* user says num divided by scale and we say internally that
2893 * is MAX_SCORE * num / scale.
2894 */
2895 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2896 }
2897
2898 static int diff_scoreopt_parse(const char *opt)
2899 {
2900 int opt1, opt2, cmd;
2901
2902 if (*opt++ != '-')
2903 return -1;
2904 cmd = *opt++;
2905 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2906 return -1; /* that is not a -M, -C nor -B option */
2907
2908 opt1 = parse_num(&opt);
2909 if (cmd != 'B')
2910 opt2 = 0;
2911 else {
2912 if (*opt == 0)
2913 opt2 = 0;
2914 else if (*opt != '/')
2915 return -1; /* we expect -B80/99 or -B80 */
2916 else {
2917 opt++;
2918 opt2 = parse_num(&opt);
2919 }
2920 }
2921 if (*opt != 0)
2922 return -1;
2923 return opt1 | (opt2 << 16);
2924 }
2925
2926 struct diff_queue_struct diff_queued_diff;
2927
2928 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2929 {
2930 if (queue->alloc <= queue->nr) {
2931 queue->alloc = alloc_nr(queue->alloc);
2932 queue->queue = xrealloc(queue->queue,
2933 sizeof(dp) * queue->alloc);
2934 }
2935 queue->queue[queue->nr++] = dp;
2936 }
2937
2938 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2939 struct diff_filespec *one,
2940 struct diff_filespec *two)
2941 {
2942 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2943 dp->one = one;
2944 dp->two = two;
2945 if (queue)
2946 diff_q(queue, dp);
2947 return dp;
2948 }
2949
2950 void diff_free_filepair(struct diff_filepair *p)
2951 {
2952 free_filespec(p->one);
2953 free_filespec(p->two);
2954 free(p);
2955 }
2956
2957 /* This is different from find_unique_abbrev() in that
2958 * it stuffs the result with dots for alignment.
2959 */
2960 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2961 {
2962 int abblen;
2963 const char *abbrev;
2964 if (len == 40)
2965 return sha1_to_hex(sha1);
2966
2967 abbrev = find_unique_abbrev(sha1, len);
2968 abblen = strlen(abbrev);
2969 if (abblen < 37) {
2970 static char hex[41];
2971 if (len < abblen && abblen <= len + 2)
2972 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2973 else
2974 sprintf(hex, "%s...", abbrev);
2975 return hex;
2976 }
2977 return sha1_to_hex(sha1);
2978 }
2979
2980 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2981 {
2982 int line_termination = opt->line_termination;
2983 int inter_name_termination = line_termination ? '\t' : '\0';
2984
2985 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2986 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2987 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2988 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2989 }
2990 if (p->score) {
2991 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2992 inter_name_termination);
2993 } else {
2994 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
2995 }
2996
2997 if (p->status == DIFF_STATUS_COPIED ||
2998 p->status == DIFF_STATUS_RENAMED) {
2999 const char *name_a, *name_b;
3000 name_a = p->one->path;
3001 name_b = p->two->path;
3002 strip_prefix(opt->prefix_length, &name_a, &name_b);
3003 write_name_quoted(name_a, opt->file, inter_name_termination);
3004 write_name_quoted(name_b, opt->file, line_termination);
3005 } else {
3006 const char *name_a, *name_b;
3007 name_a = p->one->mode ? p->one->path : p->two->path;
3008 name_b = NULL;
3009 strip_prefix(opt->prefix_length, &name_a, &name_b);
3010 write_name_quoted(name_a, opt->file, line_termination);
3011 }
3012 }
3013
3014 int diff_unmodified_pair(struct diff_filepair *p)
3015 {
3016 /* This function is written stricter than necessary to support
3017 * the currently implemented transformers, but the idea is to
3018 * let transformers to produce diff_filepairs any way they want,
3019 * and filter and clean them up here before producing the output.
3020 */
3021 struct diff_filespec *one = p->one, *two = p->two;
3022
3023 if (DIFF_PAIR_UNMERGED(p))
3024 return 0; /* unmerged is interesting */
3025
3026 /* deletion, addition, mode or type change
3027 * and rename are all interesting.
3028 */
3029 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3030 DIFF_PAIR_MODE_CHANGED(p) ||
3031 strcmp(one->path, two->path))
3032 return 0;
3033
3034 /* both are valid and point at the same path. that is, we are
3035 * dealing with a change.
3036 */
3037 if (one->sha1_valid && two->sha1_valid &&
3038 !hashcmp(one->sha1, two->sha1))
3039 return 1; /* no change */
3040 if (!one->sha1_valid && !two->sha1_valid)
3041 return 1; /* both look at the same file on the filesystem. */
3042 return 0;
3043 }
3044
3045 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3046 {
3047 if (diff_unmodified_pair(p))
3048 return;
3049
3050 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3051 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3052 return; /* no tree diffs in patch format */
3053
3054 run_diff(p, o);
3055 }
3056
3057 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3058 struct diffstat_t *diffstat)
3059 {
3060 if (diff_unmodified_pair(p))
3061 return;
3062
3063 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3064 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3065 return; /* no tree diffs in patch format */
3066
3067 run_diffstat(p, o, diffstat);
3068 }
3069
3070 static void diff_flush_checkdiff(struct diff_filepair *p,
3071 struct diff_options *o)
3072 {
3073 if (diff_unmodified_pair(p))
3074 return;
3075
3076 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3077 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3078 return; /* no tree diffs in patch format */
3079
3080 run_checkdiff(p, o);
3081 }
3082
3083 int diff_queue_is_empty(void)
3084 {
3085 struct diff_queue_struct *q = &diff_queued_diff;
3086 int i;
3087 for (i = 0; i < q->nr; i++)
3088 if (!diff_unmodified_pair(q->queue[i]))
3089 return 0;
3090 return 1;
3091 }
3092
3093 #if DIFF_DEBUG
3094 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3095 {
3096 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3097 x, one ? one : "",
3098 s->path,
3099 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3100 s->mode,
3101 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3102 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3103 x, one ? one : "",
3104 s->size, s->xfrm_flags);
3105 }
3106
3107 void diff_debug_filepair(const struct diff_filepair *p, int i)
3108 {
3109 diff_debug_filespec(p->one, i, "one");
3110 diff_debug_filespec(p->two, i, "two");
3111 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3112 p->score, p->status ? p->status : '?',
3113 p->one->rename_used, p->broken_pair);
3114 }
3115
3116 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3117 {
3118 int i;
3119 if (msg)
3120 fprintf(stderr, "%s\n", msg);
3121 fprintf(stderr, "q->nr = %d\n", q->nr);
3122 for (i = 0; i < q->nr; i++) {
3123 struct diff_filepair *p = q->queue[i];
3124 diff_debug_filepair(p, i);
3125 }
3126 }
3127 #endif
3128
3129 static void diff_resolve_rename_copy(void)
3130 {
3131 int i;
3132 struct diff_filepair *p;
3133 struct diff_queue_struct *q = &diff_queued_diff;
3134
3135 diff_debug_queue("resolve-rename-copy", q);
3136
3137 for (i = 0; i < q->nr; i++) {
3138 p = q->queue[i];
3139 p->status = 0; /* undecided */
3140 if (DIFF_PAIR_UNMERGED(p))
3141 p->status = DIFF_STATUS_UNMERGED;
3142 else if (!DIFF_FILE_VALID(p->one))
3143 p->status = DIFF_STATUS_ADDED;
3144 else if (!DIFF_FILE_VALID(p->two))
3145 p->status = DIFF_STATUS_DELETED;
3146 else if (DIFF_PAIR_TYPE_CHANGED(p))
3147 p->status = DIFF_STATUS_TYPE_CHANGED;
3148
3149 /* from this point on, we are dealing with a pair
3150 * whose both sides are valid and of the same type, i.e.
3151 * either in-place edit or rename/copy edit.
3152 */
3153 else if (DIFF_PAIR_RENAME(p)) {
3154 /*
3155 * A rename might have re-connected a broken
3156 * pair up, causing the pathnames to be the
3157 * same again. If so, that's not a rename at
3158 * all, just a modification..
3159 *
3160 * Otherwise, see if this source was used for
3161 * multiple renames, in which case we decrement
3162 * the count, and call it a copy.
3163 */
3164 if (!strcmp(p->one->path, p->two->path))
3165 p->status = DIFF_STATUS_MODIFIED;
3166 else if (--p->one->rename_used > 0)
3167 p->status = DIFF_STATUS_COPIED;
3168 else
3169 p->status = DIFF_STATUS_RENAMED;
3170 }
3171 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3172 p->one->mode != p->two->mode ||
3173 is_null_sha1(p->one->sha1))
3174 p->status = DIFF_STATUS_MODIFIED;
3175 else {
3176 /* This is a "no-change" entry and should not
3177 * happen anymore, but prepare for broken callers.
3178 */
3179 error("feeding unmodified %s to diffcore",
3180 p->one->path);
3181 p->status = DIFF_STATUS_UNKNOWN;
3182 }
3183 }
3184 diff_debug_queue("resolve-rename-copy done", q);
3185 }
3186
3187 static int check_pair_status(struct diff_filepair *p)
3188 {
3189 switch (p->status) {
3190 case DIFF_STATUS_UNKNOWN:
3191 return 0;
3192 case 0:
3193 die("internal error in diff-resolve-rename-copy");
3194 default:
3195 return 1;
3196 }
3197 }
3198
3199 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3200 {
3201 int fmt = opt->output_format;
3202
3203 if (fmt & DIFF_FORMAT_CHECKDIFF)
3204 diff_flush_checkdiff(p, opt);
3205 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3206 diff_flush_raw(p, opt);
3207 else if (fmt & DIFF_FORMAT_NAME) {
3208 const char *name_a, *name_b;
3209 name_a = p->two->path;
3210 name_b = NULL;
3211 strip_prefix(opt->prefix_length, &name_a, &name_b);
3212 write_name_quoted(name_a, opt->file, opt->line_termination);
3213 }
3214 }
3215
3216 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3217 {
3218 if (fs->mode)
3219 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3220 else
3221 fprintf(file, " %s ", newdelete);
3222 write_name_quoted(fs->path, file, '\n');
3223 }
3224
3225
3226 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
3227 {
3228 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3229 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
3230 show_name ? ' ' : '\n');
3231 if (show_name) {
3232 write_name_quoted(p->two->path, file, '\n');
3233 }
3234 }
3235 }
3236
3237 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
3238 {
3239 char *names = pprint_rename(p->one->path, p->two->path);
3240
3241 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3242 free(names);
3243 show_mode_change(file, p, 0);
3244 }
3245
3246 static void diff_summary(FILE *file, struct diff_filepair *p)
3247 {
3248 switch(p->status) {
3249 case DIFF_STATUS_DELETED:
3250 show_file_mode_name(file, "delete", p->one);
3251 break;
3252 case DIFF_STATUS_ADDED:
3253 show_file_mode_name(file, "create", p->two);
3254 break;
3255 case DIFF_STATUS_COPIED:
3256 show_rename_copy(file, "copy", p);
3257 break;
3258 case DIFF_STATUS_RENAMED:
3259 show_rename_copy(file, "rename", p);
3260 break;
3261 default:
3262 if (p->score) {
3263 fputs(" rewrite ", file);
3264 write_name_quoted(p->two->path, file, ' ');
3265 fprintf(file, "(%d%%)\n", similarity_index(p));
3266 }
3267 show_mode_change(file, p, !p->score);
3268 break;
3269 }
3270 }
3271
3272 struct patch_id_t {
3273 git_SHA_CTX *ctx;
3274 int patchlen;
3275 };
3276
3277 static int remove_space(char *line, int len)
3278 {
3279 int i;
3280 char *dst = line;
3281 unsigned char c;
3282
3283 for (i = 0; i < len; i++)
3284 if (!isspace((c = line[i])))
3285 *dst++ = c;
3286
3287 return dst - line;
3288 }
3289
3290 static void patch_id_consume(void *priv, char *line, unsigned long len)
3291 {
3292 struct patch_id_t *data = priv;
3293 int new_len;
3294
3295 /* Ignore line numbers when computing the SHA1 of the patch */
3296 if (!prefixcmp(line, "@@ -"))
3297 return;
3298
3299 new_len = remove_space(line, len);
3300
3301 git_SHA1_Update(data->ctx, line, new_len);
3302 data->patchlen += new_len;
3303 }
3304
3305 /* returns 0 upon success, and writes result into sha1 */
3306 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3307 {
3308 struct diff_queue_struct *q = &diff_queued_diff;
3309 int i;
3310 git_SHA_CTX ctx;
3311 struct patch_id_t data;
3312 char buffer[PATH_MAX * 4 + 20];
3313
3314 git_SHA1_Init(&ctx);
3315 memset(&data, 0, sizeof(struct patch_id_t));
3316 data.ctx = &ctx;
3317
3318 for (i = 0; i < q->nr; i++) {
3319 xpparam_t xpp;
3320 xdemitconf_t xecfg;
3321 xdemitcb_t ecb;
3322 mmfile_t mf1, mf2;
3323 struct diff_filepair *p = q->queue[i];
3324 int len1, len2;
3325
3326 memset(&xpp, 0, sizeof(xpp));
3327 memset(&xecfg, 0, sizeof(xecfg));
3328 if (p->status == 0)
3329 return error("internal diff status error");
3330 if (p->status == DIFF_STATUS_UNKNOWN)
3331 continue;
3332 if (diff_unmodified_pair(p))
3333 continue;
3334 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3335 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3336 continue;
3337 if (DIFF_PAIR_UNMERGED(p))
3338 continue;
3339
3340 diff_fill_sha1_info(p->one);
3341 diff_fill_sha1_info(p->two);
3342 if (fill_mmfile(&mf1, p->one) < 0 ||
3343 fill_mmfile(&mf2, p->two) < 0)
3344 return error("unable to read files to diff");
3345
3346 len1 = remove_space(p->one->path, strlen(p->one->path));
3347 len2 = remove_space(p->two->path, strlen(p->two->path));
3348 if (p->one->mode == 0)
3349 len1 = snprintf(buffer, sizeof(buffer),
3350 "diff--gita/%.*sb/%.*s"
3351 "newfilemode%06o"
3352 "---/dev/null"
3353 "+++b/%.*s",
3354 len1, p->one->path,
3355 len2, p->two->path,
3356 p->two->mode,
3357 len2, p->two->path);
3358 else if (p->two->mode == 0)
3359 len1 = snprintf(buffer, sizeof(buffer),
3360 "diff--gita/%.*sb/%.*s"
3361 "deletedfilemode%06o"
3362 "---a/%.*s"
3363 "+++/dev/null",
3364 len1, p->one->path,
3365 len2, p->two->path,
3366 p->one->mode,
3367 len1, p->one->path);
3368 else
3369 len1 = snprintf(buffer, sizeof(buffer),
3370 "diff--gita/%.*sb/%.*s"
3371 "---a/%.*s"
3372 "+++b/%.*s",
3373 len1, p->one->path,
3374 len2, p->two->path,
3375 len1, p->one->path,
3376 len2, p->two->path);
3377 git_SHA1_Update(&ctx, buffer, len1);
3378
3379 xpp.flags = XDF_NEED_MINIMAL;
3380 xecfg.ctxlen = 3;
3381 xecfg.flags = XDL_EMIT_FUNCNAMES;
3382 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3383 &xpp, &xecfg, &ecb);
3384 }
3385
3386 git_SHA1_Final(sha1, &ctx);
3387 return 0;
3388 }
3389
3390 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3391 {
3392 struct diff_queue_struct *q = &diff_queued_diff;
3393 int i;
3394 int result = diff_get_patch_id(options, sha1);
3395
3396 for (i = 0; i < q->nr; i++)
3397 diff_free_filepair(q->queue[i]);
3398
3399 free(q->queue);
3400 q->queue = NULL;
3401 q->nr = q->alloc = 0;
3402
3403 return result;
3404 }
3405
3406 static int is_summary_empty(const struct diff_queue_struct *q)
3407 {
3408 int i;
3409
3410 for (i = 0; i < q->nr; i++) {
3411 const struct diff_filepair *p = q->queue[i];
3412
3413 switch (p->status) {
3414 case DIFF_STATUS_DELETED:
3415 case DIFF_STATUS_ADDED:
3416 case DIFF_STATUS_COPIED:
3417 case DIFF_STATUS_RENAMED:
3418 return 0;
3419 default:
3420 if (p->score)
3421 return 0;
3422 if (p->one->mode && p->two->mode &&
3423 p->one->mode != p->two->mode)
3424 return 0;
3425 break;
3426 }
3427 }
3428 return 1;
3429 }
3430
3431 void diff_flush(struct diff_options *options)
3432 {
3433 struct diff_queue_struct *q = &diff_queued_diff;
3434 int i, output_format = options->output_format;
3435 int separator = 0;
3436
3437 /*
3438 * Order: raw, stat, summary, patch
3439 * or: name/name-status/checkdiff (other bits clear)
3440 */
3441 if (!q->nr)
3442 goto free_queue;
3443
3444 if (output_format & (DIFF_FORMAT_RAW |
3445 DIFF_FORMAT_NAME |
3446 DIFF_FORMAT_NAME_STATUS |
3447 DIFF_FORMAT_CHECKDIFF)) {
3448 for (i = 0; i < q->nr; i++) {
3449 struct diff_filepair *p = q->queue[i];
3450 if (check_pair_status(p))
3451 flush_one_pair(p, options);
3452 }
3453 separator++;
3454 }
3455
3456 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3457 struct diffstat_t diffstat;
3458
3459 memset(&diffstat, 0, sizeof(struct diffstat_t));
3460 for (i = 0; i < q->nr; i++) {
3461 struct diff_filepair *p = q->queue[i];
3462 if (check_pair_status(p))
3463 diff_flush_stat(p, options, &diffstat);
3464 }
3465 if (output_format & DIFF_FORMAT_NUMSTAT)
3466 show_numstat(&diffstat, options);
3467 if (output_format & DIFF_FORMAT_DIFFSTAT)
3468 show_stats(&diffstat, options);
3469 if (output_format & DIFF_FORMAT_SHORTSTAT)
3470 show_shortstats(&diffstat, options);
3471 free_diffstat_info(&diffstat);
3472 separator++;
3473 }
3474 if (output_format & DIFF_FORMAT_DIRSTAT)
3475 show_dirstat(options);
3476
3477 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3478 for (i = 0; i < q->nr; i++)
3479 diff_summary(options->file, q->queue[i]);
3480 separator++;
3481 }
3482
3483 if (output_format & DIFF_FORMAT_PATCH) {
3484 if (separator) {
3485 putc(options->line_termination, options->file);
3486 if (options->stat_sep) {
3487 /* attach patch instead of inline */
3488 fputs(options->stat_sep, options->file);
3489 }
3490 }
3491
3492 for (i = 0; i < q->nr; i++) {
3493 struct diff_filepair *p = q->queue[i];
3494 if (check_pair_status(p))
3495 diff_flush_patch(p, options);
3496 }
3497 }
3498
3499 if (output_format & DIFF_FORMAT_CALLBACK)
3500 options->format_callback(q, options, options->format_callback_data);
3501
3502 for (i = 0; i < q->nr; i++)
3503 diff_free_filepair(q->queue[i]);
3504 free_queue:
3505 free(q->queue);
3506 q->queue = NULL;
3507 q->nr = q->alloc = 0;
3508 if (options->close_file)
3509 fclose(options->file);
3510 }
3511
3512 static void diffcore_apply_filter(const char *filter)
3513 {
3514 int i;
3515 struct diff_queue_struct *q = &diff_queued_diff;
3516 struct diff_queue_struct outq;
3517 outq.queue = NULL;
3518 outq.nr = outq.alloc = 0;
3519
3520 if (!filter)
3521 return;
3522
3523 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3524 int found;
3525 for (i = found = 0; !found && i < q->nr; i++) {
3526 struct diff_filepair *p = q->queue[i];
3527 if (((p->status == DIFF_STATUS_MODIFIED) &&
3528 ((p->score &&
3529 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3530 (!p->score &&
3531 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3532 ((p->status != DIFF_STATUS_MODIFIED) &&
3533 strchr(filter, p->status)))
3534 found++;
3535 }
3536 if (found)
3537 return;
3538
3539 /* otherwise we will clear the whole queue
3540 * by copying the empty outq at the end of this
3541 * function, but first clear the current entries
3542 * in the queue.
3543 */
3544 for (i = 0; i < q->nr; i++)
3545 diff_free_filepair(q->queue[i]);
3546 }
3547 else {
3548 /* Only the matching ones */
3549 for (i = 0; i < q->nr; i++) {
3550 struct diff_filepair *p = q->queue[i];
3551
3552 if (((p->status == DIFF_STATUS_MODIFIED) &&
3553 ((p->score &&
3554 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3555 (!p->score &&
3556 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3557 ((p->status != DIFF_STATUS_MODIFIED) &&
3558 strchr(filter, p->status)))
3559 diff_q(&outq, p);
3560 else
3561 diff_free_filepair(p);
3562 }
3563 }
3564 free(q->queue);
3565 *q = outq;
3566 }
3567
3568 /* Check whether two filespecs with the same mode and size are identical */
3569 static int diff_filespec_is_identical(struct diff_filespec *one,
3570 struct diff_filespec *two)
3571 {
3572 if (S_ISGITLINK(one->mode))
3573 return 0;
3574 if (diff_populate_filespec(one, 0))
3575 return 0;
3576 if (diff_populate_filespec(two, 0))
3577 return 0;
3578 return !memcmp(one->data, two->data, one->size);
3579 }
3580
3581 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3582 {
3583 int i;
3584 struct diff_queue_struct *q = &diff_queued_diff;
3585 struct diff_queue_struct outq;
3586 outq.queue = NULL;
3587 outq.nr = outq.alloc = 0;
3588
3589 for (i = 0; i < q->nr; i++) {
3590 struct diff_filepair *p = q->queue[i];
3591
3592 /*
3593 * 1. Entries that come from stat info dirtyness
3594 * always have both sides (iow, not create/delete),
3595 * one side of the object name is unknown, with
3596 * the same mode and size. Keep the ones that
3597 * do not match these criteria. They have real
3598 * differences.
3599 *
3600 * 2. At this point, the file is known to be modified,
3601 * with the same mode and size, and the object
3602 * name of one side is unknown. Need to inspect
3603 * the identical contents.
3604 */
3605 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3606 !DIFF_FILE_VALID(p->two) ||
3607 (p->one->sha1_valid && p->two->sha1_valid) ||
3608 (p->one->mode != p->two->mode) ||
3609 diff_populate_filespec(p->one, 1) ||
3610 diff_populate_filespec(p->two, 1) ||
3611 (p->one->size != p->two->size) ||
3612 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3613 diff_q(&outq, p);
3614 else {
3615 /*
3616 * The caller can subtract 1 from skip_stat_unmatch
3617 * to determine how many paths were dirty only
3618 * due to stat info mismatch.
3619 */
3620 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3621 diffopt->skip_stat_unmatch++;
3622 diff_free_filepair(p);
3623 }
3624 }
3625 free(q->queue);
3626 *q = outq;
3627 }
3628
3629 void diffcore_std(struct diff_options *options)
3630 {
3631 if (options->skip_stat_unmatch)
3632 diffcore_skip_stat_unmatch(options);
3633 if (options->break_opt != -1)
3634 diffcore_break(options->break_opt);
3635 if (options->detect_rename)
3636 diffcore_rename(options);
3637 if (options->break_opt != -1)
3638 diffcore_merge_broken();
3639 if (options->pickaxe)
3640 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3641 if (options->orderfile)
3642 diffcore_order(options->orderfile);
3643 diff_resolve_rename_copy();
3644 diffcore_apply_filter(options->filter);
3645
3646 if (diff_queued_diff.nr)
3647 DIFF_OPT_SET(options, HAS_CHANGES);
3648 else
3649 DIFF_OPT_CLR(options, HAS_CHANGES);
3650 }
3651
3652 int diff_result_code(struct diff_options *opt, int status)
3653 {
3654 int result = 0;
3655 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3656 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3657 return status;
3658 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3659 DIFF_OPT_TST(opt, HAS_CHANGES))
3660 result |= 01;
3661 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3662 DIFF_OPT_TST(opt, CHECK_FAILED))
3663 result |= 02;
3664 return result;
3665 }
3666
3667 void diff_addremove(struct diff_options *options,
3668 int addremove, unsigned mode,
3669 const unsigned char *sha1,
3670 const char *concatpath)
3671 {
3672 struct diff_filespec *one, *two;
3673
3674 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3675 return;
3676
3677 /* This may look odd, but it is a preparation for
3678 * feeding "there are unchanged files which should
3679 * not produce diffs, but when you are doing copy
3680 * detection you would need them, so here they are"
3681 * entries to the diff-core. They will be prefixed
3682 * with something like '=' or '*' (I haven't decided
3683 * which but should not make any difference).
3684 * Feeding the same new and old to diff_change()
3685 * also has the same effect.
3686 * Before the final output happens, they are pruned after
3687 * merged into rename/copy pairs as appropriate.
3688 */
3689 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3690 addremove = (addremove == '+' ? '-' :
3691 addremove == '-' ? '+' : addremove);
3692
3693 if (options->prefix &&
3694 strncmp(concatpath, options->prefix, options->prefix_length))
3695 return;
3696
3697 one = alloc_filespec(concatpath);
3698 two = alloc_filespec(concatpath);
3699
3700 if (addremove != '+')
3701 fill_filespec(one, sha1, mode);
3702 if (addremove != '-')
3703 fill_filespec(two, sha1, mode);
3704
3705 diff_queue(&diff_queued_diff, one, two);
3706 DIFF_OPT_SET(options, HAS_CHANGES);
3707 }
3708
3709 void diff_change(struct diff_options *options,
3710 unsigned old_mode, unsigned new_mode,
3711 const unsigned char *old_sha1,
3712 const unsigned char *new_sha1,
3713 const char *concatpath)
3714 {
3715 struct diff_filespec *one, *two;
3716
3717 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3718 && S_ISGITLINK(new_mode))
3719 return;
3720
3721 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3722 unsigned tmp;
3723 const unsigned char *tmp_c;
3724 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3725 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3726 }
3727
3728 if (options->prefix &&
3729 strncmp(concatpath, options->prefix, options->prefix_length))
3730 return;
3731
3732 one = alloc_filespec(concatpath);
3733 two = alloc_filespec(concatpath);
3734 fill_filespec(one, old_sha1, old_mode);
3735 fill_filespec(two, new_sha1, new_mode);
3736
3737 diff_queue(&diff_queued_diff, one, two);
3738 DIFF_OPT_SET(options, HAS_CHANGES);
3739 }
3740
3741 void diff_unmerge(struct diff_options *options,
3742 const char *path,
3743 unsigned mode, const unsigned char *sha1)
3744 {
3745 struct diff_filespec *one, *two;
3746
3747 if (options->prefix &&
3748 strncmp(path, options->prefix, options->prefix_length))
3749 return;
3750
3751 one = alloc_filespec(path);
3752 two = alloc_filespec(path);
3753 fill_filespec(one, sha1, mode);
3754 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3755 }
3756
3757 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
3758 size_t *outsize)
3759 {
3760 struct diff_tempfile *temp;
3761 const char *argv[3];
3762 const char **arg = argv;
3763 struct child_process child;
3764 struct strbuf buf = STRBUF_INIT;
3765
3766 temp = prepare_temp_file(spec->path, spec);
3767 *arg++ = pgm;
3768 *arg++ = temp->name;
3769 *arg = NULL;
3770
3771 memset(&child, 0, sizeof(child));
3772 child.argv = argv;
3773 child.out = -1;
3774 if (start_command(&child) != 0 ||
3775 strbuf_read(&buf, child.out, 0) < 0 ||
3776 finish_command(&child) != 0) {
3777 strbuf_release(&buf);
3778 remove_tempfile();
3779 error("error running textconv command '%s'", pgm);
3780 return NULL;
3781 }
3782 remove_tempfile();
3783
3784 return strbuf_detach(&buf, outsize);
3785 }
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