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Teach Makefile to check header dependencies
[git/gsoc2010-gitweb.git] / diff.c
blobf130a367dcfe8668d09a0e4a55f96d6b66251db9
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 return -1;
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 (slot < 0)
126 return 0;
127 if (!value)
128 return config_error_nonbool(var);
129 color_parse(value, var, diff_colors[slot]);
130 return 0;
131 }
132
133 /* like GNU diff's --suppress-blank-empty option */
134 if (!strcmp(var, "diff.suppressblankempty") ||
135 /* for backwards compatibility */
136 !strcmp(var, "diff.suppress-blank-empty")) {
137 diff_suppress_blank_empty = git_config_bool(var, value);
138 return 0;
139 }
140
141 return git_color_default_config(var, value, cb);
142 }
143
144 static char *quote_two(const char *one, const char *two)
145 {
146 int need_one = quote_c_style(one, NULL, NULL, 1);
147 int need_two = quote_c_style(two, NULL, NULL, 1);
148 struct strbuf res = STRBUF_INIT;
149
150 if (need_one + need_two) {
151 strbuf_addch(&res, '"');
152 quote_c_style(one, &res, NULL, 1);
153 quote_c_style(two, &res, NULL, 1);
154 strbuf_addch(&res, '"');
155 } else {
156 strbuf_addstr(&res, one);
157 strbuf_addstr(&res, two);
158 }
159 return strbuf_detach(&res, NULL);
160 }
161
162 static const char *external_diff(void)
163 {
164 static const char *external_diff_cmd = NULL;
165 static int done_preparing = 0;
166
167 if (done_preparing)
168 return external_diff_cmd;
169 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
170 if (!external_diff_cmd)
171 external_diff_cmd = external_diff_cmd_cfg;
172 done_preparing = 1;
173 return external_diff_cmd;
174 }
175
176 static struct diff_tempfile {
177 const char *name; /* filename external diff should read from */
178 char hex[41];
179 char mode[10];
180 char tmp_path[PATH_MAX];
181 } diff_temp[2];
182
183 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
184
185 struct emit_callback {
186 int color_diff;
187 unsigned ws_rule;
188 int blank_at_eof_in_preimage;
189 int blank_at_eof_in_postimage;
190 int lno_in_preimage;
191 int lno_in_postimage;
192 sane_truncate_fn truncate;
193 const char **label_path;
194 struct diff_words_data *diff_words;
195 int *found_changesp;
196 FILE *file;
197 struct strbuf *header;
198 };
199
200 static int count_lines(const char *data, int size)
201 {
202 int count, ch, completely_empty = 1, nl_just_seen = 0;
203 count = 0;
204 while (0 < size--) {
205 ch = *data++;
206 if (ch == '\n') {
207 count++;
208 nl_just_seen = 1;
209 completely_empty = 0;
210 }
211 else {
212 nl_just_seen = 0;
213 completely_empty = 0;
214 }
215 }
216 if (completely_empty)
217 return 0;
218 if (!nl_just_seen)
219 count++; /* no trailing newline */
220 return count;
221 }
222
223 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
224 {
225 if (!DIFF_FILE_VALID(one)) {
226 mf->ptr = (char *)""; /* does not matter */
227 mf->size = 0;
228 return 0;
229 }
230 else if (diff_populate_filespec(one, 0))
231 return -1;
232
233 mf->ptr = one->data;
234 mf->size = one->size;
235 return 0;
236 }
237
238 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
239 {
240 char *ptr = mf->ptr;
241 long size = mf->size;
242 int cnt = 0;
243
244 if (!size)
245 return cnt;
246 ptr += size - 1; /* pointing at the very end */
247 if (*ptr != '\n')
248 ; /* incomplete line */
249 else
250 ptr--; /* skip the last LF */
251 while (mf->ptr < ptr) {
252 char *prev_eol;
253 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
254 if (*prev_eol == '\n')
255 break;
256 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
257 break;
258 cnt++;
259 ptr = prev_eol - 1;
260 }
261 return cnt;
262 }
263
264 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
265 struct emit_callback *ecbdata)
266 {
267 int l1, l2, at;
268 unsigned ws_rule = ecbdata->ws_rule;
269 l1 = count_trailing_blank(mf1, ws_rule);
270 l2 = count_trailing_blank(mf2, ws_rule);
271 if (l2 <= l1) {
272 ecbdata->blank_at_eof_in_preimage = 0;
273 ecbdata->blank_at_eof_in_postimage = 0;
274 return;
275 }
276 at = count_lines(mf1->ptr, mf1->size);
277 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
278
279 at = count_lines(mf2->ptr, mf2->size);
280 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
281 }
282
283 static void emit_line_0(FILE *file, const char *set, const char *reset,
284 int first, const char *line, int len)
285 {
286 int has_trailing_newline, has_trailing_carriage_return;
287 int nofirst;
288
289 if (len == 0) {
290 has_trailing_newline = (first == '\n');
291 has_trailing_carriage_return = (!has_trailing_newline &&
292 (first == '\r'));
293 nofirst = has_trailing_newline || has_trailing_carriage_return;
294 } else {
295 has_trailing_newline = (len > 0 && line[len-1] == '\n');
296 if (has_trailing_newline)
297 len--;
298 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
299 if (has_trailing_carriage_return)
300 len--;
301 nofirst = 0;
302 }
303
304 if (len || !nofirst) {
305 fputs(set, file);
306 if (!nofirst)
307 fputc(first, file);
308 fwrite(line, len, 1, file);
309 fputs(reset, file);
310 }
311 if (has_trailing_carriage_return)
312 fputc('\r', file);
313 if (has_trailing_newline)
314 fputc('\n', file);
315 }
316
317 static void emit_line(FILE *file, const char *set, const char *reset,
318 const char *line, int len)
319 {
320 emit_line_0(file, set, reset, line[0], line+1, len-1);
321 }
322
323 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
324 {
325 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
326 ecbdata->blank_at_eof_in_preimage &&
327 ecbdata->blank_at_eof_in_postimage &&
328 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
329 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
330 return 0;
331 return ws_blank_line(line, len, ecbdata->ws_rule);
332 }
333
334 static void emit_add_line(const char *reset,
335 struct emit_callback *ecbdata,
336 const char *line, int len)
337 {
338 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
339 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
340
341 if (!*ws)
342 emit_line_0(ecbdata->file, set, reset, '+', line, len);
343 else if (new_blank_line_at_eof(ecbdata, line, len))
344 /* Blank line at EOF - paint '+' as well */
345 emit_line_0(ecbdata->file, ws, reset, '+', line, len);
346 else {
347 /* Emit just the prefix, then the rest. */
348 emit_line_0(ecbdata->file, set, reset, '+', "", 0);
349 ws_check_emit(line, len, ecbdata->ws_rule,
350 ecbdata->file, set, reset, ws);
351 }
352 }
353
354 static void emit_hunk_header(struct emit_callback *ecbdata,
355 const char *line, int len)
356 {
357 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
358 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
359 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
360 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
361 static const char atat[2] = { '@', '@' };
362 const char *cp, *ep;
363
364 /*
365 * As a hunk header must begin with "@@ -<old>, +<new> @@",
366 * it always is at least 10 bytes long.
367 */
368 if (len < 10 ||
369 memcmp(line, atat, 2) ||
370 !(ep = memmem(line + 2, len - 2, atat, 2))) {
371 emit_line(ecbdata->file, plain, reset, line, len);
372 return;
373 }
374 ep += 2; /* skip over @@ */
375
376 /* The hunk header in fraginfo color */
377 emit_line(ecbdata->file, frag, reset, line, ep - line);
378
379 /* blank before the func header */
380 for (cp = ep; ep - line < len; ep++)
381 if (*ep != ' ' && *ep != '\t')
382 break;
383 if (ep != cp)
384 emit_line(ecbdata->file, plain, reset, cp, ep - cp);
385
386 if (ep < line + len)
387 emit_line(ecbdata->file, func, reset, ep, line + len - ep);
388 }
389
390 static struct diff_tempfile *claim_diff_tempfile(void) {
391 int i;
392 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
393 if (!diff_temp[i].name)
394 return diff_temp + i;
395 die("BUG: diff is failing to clean up its tempfiles");
396 }
397
398 static int remove_tempfile_installed;
399
400 static void remove_tempfile(void)
401 {
402 int i;
403 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
404 if (diff_temp[i].name == diff_temp[i].tmp_path)
405 unlink_or_warn(diff_temp[i].name);
406 diff_temp[i].name = NULL;
407 }
408 }
409
410 static void remove_tempfile_on_signal(int signo)
411 {
412 remove_tempfile();
413 sigchain_pop(signo);
414 raise(signo);
415 }
416
417 static void print_line_count(FILE *file, int count)
418 {
419 switch (count) {
420 case 0:
421 fprintf(file, "0,0");
422 break;
423 case 1:
424 fprintf(file, "1");
425 break;
426 default:
427 fprintf(file, "1,%d", count);
428 break;
429 }
430 }
431
432 static void emit_rewrite_lines(struct emit_callback *ecb,
433 int prefix, const char *data, int size)
434 {
435 const char *endp = NULL;
436 static const char *nneof = " No newline at end of file\n";
437 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
438 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
439
440 while (0 < size) {
441 int len;
442
443 endp = memchr(data, '\n', size);
444 len = endp ? (endp - data + 1) : size;
445 if (prefix != '+') {
446 ecb->lno_in_preimage++;
447 emit_line_0(ecb->file, old, reset, '-',
448 data, len);
449 } else {
450 ecb->lno_in_postimage++;
451 emit_add_line(reset, ecb, data, len);
452 }
453 size -= len;
454 data += len;
455 }
456 if (!endp) {
457 const char *plain = diff_get_color(ecb->color_diff,
458 DIFF_PLAIN);
459 emit_line_0(ecb->file, plain, reset, '\\',
460 nneof, strlen(nneof));
461 }
462 }
463
464 static void emit_rewrite_diff(const char *name_a,
465 const char *name_b,
466 struct diff_filespec *one,
467 struct diff_filespec *two,
468 const char *textconv_one,
469 const char *textconv_two,
470 struct diff_options *o)
471 {
472 int lc_a, lc_b;
473 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
474 const char *name_a_tab, *name_b_tab;
475 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
476 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
477 const char *reset = diff_get_color(color_diff, DIFF_RESET);
478 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
479 const char *a_prefix, *b_prefix;
480 const char *data_one, *data_two;
481 size_t size_one, size_two;
482 struct emit_callback ecbdata;
483
484 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
485 a_prefix = o->b_prefix;
486 b_prefix = o->a_prefix;
487 } else {
488 a_prefix = o->a_prefix;
489 b_prefix = o->b_prefix;
490 }
491
492 name_a += (*name_a == '/');
493 name_b += (*name_b == '/');
494 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
495 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
496
497 strbuf_reset(&a_name);
498 strbuf_reset(&b_name);
499 quote_two_c_style(&a_name, a_prefix, name_a, 0);
500 quote_two_c_style(&b_name, b_prefix, name_b, 0);
501
502 diff_populate_filespec(one, 0);
503 diff_populate_filespec(two, 0);
504 if (textconv_one) {
505 data_one = run_textconv(textconv_one, one, &size_one);
506 if (!data_one)
507 die("unable to read files to diff");
508 }
509 else {
510 data_one = one->data;
511 size_one = one->size;
512 }
513 if (textconv_two) {
514 data_two = run_textconv(textconv_two, two, &size_two);
515 if (!data_two)
516 die("unable to read files to diff");
517 }
518 else {
519 data_two = two->data;
520 size_two = two->size;
521 }
522
523 memset(&ecbdata, 0, sizeof(ecbdata));
524 ecbdata.color_diff = color_diff;
525 ecbdata.found_changesp = &o->found_changes;
526 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
527 ecbdata.file = o->file;
528 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
529 mmfile_t mf1, mf2;
530 mf1.ptr = (char *)data_one;
531 mf2.ptr = (char *)data_two;
532 mf1.size = size_one;
533 mf2.size = size_two;
534 check_blank_at_eof(&mf1, &mf2, &ecbdata);
535 }
536 ecbdata.lno_in_preimage = 1;
537 ecbdata.lno_in_postimage = 1;
538
539 lc_a = count_lines(data_one, size_one);
540 lc_b = count_lines(data_two, size_two);
541 fprintf(o->file,
542 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
543 metainfo, a_name.buf, name_a_tab, reset,
544 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
545 print_line_count(o->file, lc_a);
546 fprintf(o->file, " +");
547 print_line_count(o->file, lc_b);
548 fprintf(o->file, " @@%s\n", reset);
549 if (lc_a)
550 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
551 if (lc_b)
552 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
553 }
554
555 struct diff_words_buffer {
556 mmfile_t text;
557 long alloc;
558 struct diff_words_orig {
559 const char *begin, *end;
560 } *orig;
561 int orig_nr, orig_alloc;
562 };
563
564 static void diff_words_append(char *line, unsigned long len,
565 struct diff_words_buffer *buffer)
566 {
567 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
568 line++;
569 len--;
570 memcpy(buffer->text.ptr + buffer->text.size, line, len);
571 buffer->text.size += len;
572 buffer->text.ptr[buffer->text.size] = '\0';
573 }
574
575 struct diff_words_data {
576 struct diff_words_buffer minus, plus;
577 const char *current_plus;
578 FILE *file;
579 regex_t *word_regex;
580 };
581
582 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
583 {
584 struct diff_words_data *diff_words = priv;
585 int minus_first, minus_len, plus_first, plus_len;
586 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
587
588 if (line[0] != '@' || parse_hunk_header(line, len,
589 &minus_first, &minus_len, &plus_first, &plus_len))
590 return;
591
592 /* POSIX requires that first be decremented by one if len == 0... */
593 if (minus_len) {
594 minus_begin = diff_words->minus.orig[minus_first].begin;
595 minus_end =
596 diff_words->minus.orig[minus_first + minus_len - 1].end;
597 } else
598 minus_begin = minus_end =
599 diff_words->minus.orig[minus_first].end;
600
601 if (plus_len) {
602 plus_begin = diff_words->plus.orig[plus_first].begin;
603 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
604 } else
605 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
606
607 if (diff_words->current_plus != plus_begin)
608 fwrite(diff_words->current_plus,
609 plus_begin - diff_words->current_plus, 1,
610 diff_words->file);
611 if (minus_begin != minus_end)
612 color_fwrite_lines(diff_words->file,
613 diff_get_color(1, DIFF_FILE_OLD),
614 minus_end - minus_begin, minus_begin);
615 if (plus_begin != plus_end)
616 color_fwrite_lines(diff_words->file,
617 diff_get_color(1, DIFF_FILE_NEW),
618 plus_end - plus_begin, plus_begin);
619
620 diff_words->current_plus = plus_end;
621 }
622
623 /* This function starts looking at *begin, and returns 0 iff a word was found. */
624 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
625 int *begin, int *end)
626 {
627 if (word_regex && *begin < buffer->size) {
628 regmatch_t match[1];
629 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
630 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
631 '\n', match[0].rm_eo - match[0].rm_so);
632 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
633 *begin += match[0].rm_so;
634 return *begin >= *end;
635 }
636 return -1;
637 }
638
639 /* find the next word */
640 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
641 (*begin)++;
642 if (*begin >= buffer->size)
643 return -1;
644
645 /* find the end of the word */
646 *end = *begin + 1;
647 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
648 (*end)++;
649
650 return 0;
651 }
652
653 /*
654 * This function splits the words in buffer->text, stores the list with
655 * newline separator into out, and saves the offsets of the original words
656 * in buffer->orig.
657 */
658 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
659 regex_t *word_regex)
660 {
661 int i, j;
662 long alloc = 0;
663
664 out->size = 0;
665 out->ptr = NULL;
666
667 /* fake an empty "0th" word */
668 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
669 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
670 buffer->orig_nr = 1;
671
672 for (i = 0; i < buffer->text.size; i++) {
673 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
674 return;
675
676 /* store original boundaries */
677 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
678 buffer->orig_alloc);
679 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
680 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
681 buffer->orig_nr++;
682
683 /* store one word */
684 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
685 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
686 out->ptr[out->size + j - i] = '\n';
687 out->size += j - i + 1;
688
689 i = j - 1;
690 }
691 }
692
693 /* this executes the word diff on the accumulated buffers */
694 static void diff_words_show(struct diff_words_data *diff_words)
695 {
696 xpparam_t xpp;
697 xdemitconf_t xecfg;
698 xdemitcb_t ecb;
699 mmfile_t minus, plus;
700
701 /* special case: only removal */
702 if (!diff_words->plus.text.size) {
703 color_fwrite_lines(diff_words->file,
704 diff_get_color(1, DIFF_FILE_OLD),
705 diff_words->minus.text.size, diff_words->minus.text.ptr);
706 diff_words->minus.text.size = 0;
707 return;
708 }
709
710 diff_words->current_plus = diff_words->plus.text.ptr;
711
712 memset(&xpp, 0, sizeof(xpp));
713 memset(&xecfg, 0, sizeof(xecfg));
714 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
715 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
716 xpp.flags = XDF_NEED_MINIMAL;
717 /* as only the hunk header will be parsed, we need a 0-context */
718 xecfg.ctxlen = 0;
719 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
720 &xpp, &xecfg, &ecb);
721 free(minus.ptr);
722 free(plus.ptr);
723 if (diff_words->current_plus != diff_words->plus.text.ptr +
724 diff_words->plus.text.size)
725 fwrite(diff_words->current_plus,
726 diff_words->plus.text.ptr + diff_words->plus.text.size
727 - diff_words->current_plus, 1,
728 diff_words->file);
729 diff_words->minus.text.size = diff_words->plus.text.size = 0;
730 }
731
732 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
733 static void diff_words_flush(struct emit_callback *ecbdata)
734 {
735 if (ecbdata->diff_words->minus.text.size ||
736 ecbdata->diff_words->plus.text.size)
737 diff_words_show(ecbdata->diff_words);
738 }
739
740 static void free_diff_words_data(struct emit_callback *ecbdata)
741 {
742 if (ecbdata->diff_words) {
743 diff_words_flush(ecbdata);
744 free (ecbdata->diff_words->minus.text.ptr);
745 free (ecbdata->diff_words->minus.orig);
746 free (ecbdata->diff_words->plus.text.ptr);
747 free (ecbdata->diff_words->plus.orig);
748 free(ecbdata->diff_words->word_regex);
749 free(ecbdata->diff_words);
750 ecbdata->diff_words = NULL;
751 }
752 }
753
754 const char *diff_get_color(int diff_use_color, enum color_diff ix)
755 {
756 if (diff_use_color)
757 return diff_colors[ix];
758 return "";
759 }
760
761 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
762 {
763 const char *cp;
764 unsigned long allot;
765 size_t l = len;
766
767 if (ecb->truncate)
768 return ecb->truncate(line, len);
769 cp = line;
770 allot = l;
771 while (0 < l) {
772 (void) utf8_width(&cp, &l);
773 if (!cp)
774 break; /* truncated in the middle? */
775 }
776 return allot - l;
777 }
778
779 static void find_lno(const char *line, struct emit_callback *ecbdata)
780 {
781 const char *p;
782 ecbdata->lno_in_preimage = 0;
783 ecbdata->lno_in_postimage = 0;
784 p = strchr(line, '-');
785 if (!p)
786 return; /* cannot happen */
787 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
788 p = strchr(p, '+');
789 if (!p)
790 return; /* cannot happen */
791 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
792 }
793
794 static void fn_out_consume(void *priv, char *line, unsigned long len)
795 {
796 struct emit_callback *ecbdata = priv;
797 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
798 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
799 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
800
801 if (ecbdata->header) {
802 fprintf(ecbdata->file, "%s", ecbdata->header->buf);
803 strbuf_reset(ecbdata->header);
804 ecbdata->header = NULL;
805 }
806 *(ecbdata->found_changesp) = 1;
807
808 if (ecbdata->label_path[0]) {
809 const char *name_a_tab, *name_b_tab;
810
811 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
812 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
813
814 fprintf(ecbdata->file, "%s--- %s%s%s\n",
815 meta, ecbdata->label_path[0], reset, name_a_tab);
816 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
817 meta, ecbdata->label_path[1], reset, name_b_tab);
818 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
819 }
820
821 if (diff_suppress_blank_empty
822 && len == 2 && line[0] == ' ' && line[1] == '\n') {
823 line[0] = '\n';
824 len = 1;
825 }
826
827 if (line[0] == '@') {
828 if (ecbdata->diff_words)
829 diff_words_flush(ecbdata);
830 len = sane_truncate_line(ecbdata, line, len);
831 find_lno(line, ecbdata);
832 emit_hunk_header(ecbdata, line, len);
833 if (line[len-1] != '\n')
834 putc('\n', ecbdata->file);
835 return;
836 }
837
838 if (len < 1) {
839 emit_line(ecbdata->file, reset, reset, line, len);
840 return;
841 }
842
843 if (ecbdata->diff_words) {
844 if (line[0] == '-') {
845 diff_words_append(line, len,
846 &ecbdata->diff_words->minus);
847 return;
848 } else if (line[0] == '+') {
849 diff_words_append(line, len,
850 &ecbdata->diff_words->plus);
851 return;
852 }
853 diff_words_flush(ecbdata);
854 line++;
855 len--;
856 emit_line(ecbdata->file, plain, reset, line, len);
857 return;
858 }
859
860 if (line[0] != '+') {
861 const char *color =
862 diff_get_color(ecbdata->color_diff,
863 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
864 ecbdata->lno_in_preimage++;
865 if (line[0] == ' ')
866 ecbdata->lno_in_postimage++;
867 emit_line(ecbdata->file, color, reset, line, len);
868 } else {
869 ecbdata->lno_in_postimage++;
870 emit_add_line(reset, ecbdata, line + 1, len - 1);
871 }
872 }
873
874 static char *pprint_rename(const char *a, const char *b)
875 {
876 const char *old = a;
877 const char *new = b;
878 struct strbuf name = STRBUF_INIT;
879 int pfx_length, sfx_length;
880 int len_a = strlen(a);
881 int len_b = strlen(b);
882 int a_midlen, b_midlen;
883 int qlen_a = quote_c_style(a, NULL, NULL, 0);
884 int qlen_b = quote_c_style(b, NULL, NULL, 0);
885
886 if (qlen_a || qlen_b) {
887 quote_c_style(a, &name, NULL, 0);
888 strbuf_addstr(&name, " => ");
889 quote_c_style(b, &name, NULL, 0);
890 return strbuf_detach(&name, NULL);
891 }
892
893 /* Find common prefix */
894 pfx_length = 0;
895 while (*old && *new && *old == *new) {
896 if (*old == '/')
897 pfx_length = old - a + 1;
898 old++;
899 new++;
900 }
901
902 /* Find common suffix */
903 old = a + len_a;
904 new = b + len_b;
905 sfx_length = 0;
906 while (a <= old && b <= new && *old == *new) {
907 if (*old == '/')
908 sfx_length = len_a - (old - a);
909 old--;
910 new--;
911 }
912
913 /*
914 * pfx{mid-a => mid-b}sfx
915 * {pfx-a => pfx-b}sfx
916 * pfx{sfx-a => sfx-b}
917 * name-a => name-b
918 */
919 a_midlen = len_a - pfx_length - sfx_length;
920 b_midlen = len_b - pfx_length - sfx_length;
921 if (a_midlen < 0)
922 a_midlen = 0;
923 if (b_midlen < 0)
924 b_midlen = 0;
925
926 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
927 if (pfx_length + sfx_length) {
928 strbuf_add(&name, a, pfx_length);
929 strbuf_addch(&name, '{');
930 }
931 strbuf_add(&name, a + pfx_length, a_midlen);
932 strbuf_addstr(&name, " => ");
933 strbuf_add(&name, b + pfx_length, b_midlen);
934 if (pfx_length + sfx_length) {
935 strbuf_addch(&name, '}');
936 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
937 }
938 return strbuf_detach(&name, NULL);
939 }
940
941 struct diffstat_t {
942 int nr;
943 int alloc;
944 struct diffstat_file {
945 char *from_name;
946 char *name;
947 char *print_name;
948 unsigned is_unmerged:1;
949 unsigned is_binary:1;
950 unsigned is_renamed:1;
951 unsigned int added, deleted;
952 } **files;
953 };
954
955 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
956 const char *name_a,
957 const char *name_b)
958 {
959 struct diffstat_file *x;
960 x = xcalloc(sizeof (*x), 1);
961 if (diffstat->nr == diffstat->alloc) {
962 diffstat->alloc = alloc_nr(diffstat->alloc);
963 diffstat->files = xrealloc(diffstat->files,
964 diffstat->alloc * sizeof(x));
965 }
966 diffstat->files[diffstat->nr++] = x;
967 if (name_b) {
968 x->from_name = xstrdup(name_a);
969 x->name = xstrdup(name_b);
970 x->is_renamed = 1;
971 }
972 else {
973 x->from_name = NULL;
974 x->name = xstrdup(name_a);
975 }
976 return x;
977 }
978
979 static void diffstat_consume(void *priv, char *line, unsigned long len)
980 {
981 struct diffstat_t *diffstat = priv;
982 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
983
984 if (line[0] == '+')
985 x->added++;
986 else if (line[0] == '-')
987 x->deleted++;
988 }
989
990 const char mime_boundary_leader[] = "------------";
991
992 static int scale_linear(int it, int width, int max_change)
993 {
994 /*
995 * make sure that at least one '-' is printed if there were deletions,
996 * and likewise for '+'.
997 */
998 if (max_change < 2)
999 return it;
1000 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
1001 }
1002
1003 static void show_name(FILE *file,
1004 const char *prefix, const char *name, int len)
1005 {
1006 fprintf(file, " %s%-*s |", prefix, len, name);
1007 }
1008
1009 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1010 {
1011 if (cnt <= 0)
1012 return;
1013 fprintf(file, "%s", set);
1014 while (cnt--)
1015 putc(ch, file);
1016 fprintf(file, "%s", reset);
1017 }
1018
1019 static void fill_print_name(struct diffstat_file *file)
1020 {
1021 char *pname;
1022
1023 if (file->print_name)
1024 return;
1025
1026 if (!file->is_renamed) {
1027 struct strbuf buf = STRBUF_INIT;
1028 if (quote_c_style(file->name, &buf, NULL, 0)) {
1029 pname = strbuf_detach(&buf, NULL);
1030 } else {
1031 pname = file->name;
1032 strbuf_release(&buf);
1033 }
1034 } else {
1035 pname = pprint_rename(file->from_name, file->name);
1036 }
1037 file->print_name = pname;
1038 }
1039
1040 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1041 {
1042 int i, len, add, del, adds = 0, dels = 0;
1043 int max_change = 0, max_len = 0;
1044 int total_files = data->nr;
1045 int width, name_width;
1046 const char *reset, *set, *add_c, *del_c;
1047
1048 if (data->nr == 0)
1049 return;
1050
1051 width = options->stat_width ? options->stat_width : 80;
1052 name_width = options->stat_name_width ? options->stat_name_width : 50;
1053
1054 /* Sanity: give at least 5 columns to the graph,
1055 * but leave at least 10 columns for the name.
1056 */
1057 if (width < 25)
1058 width = 25;
1059 if (name_width < 10)
1060 name_width = 10;
1061 else if (width < name_width + 15)
1062 name_width = width - 15;
1063
1064 /* Find the longest filename and max number of changes */
1065 reset = diff_get_color_opt(options, DIFF_RESET);
1066 set = diff_get_color_opt(options, DIFF_PLAIN);
1067 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1068 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1069
1070 for (i = 0; i < data->nr; i++) {
1071 struct diffstat_file *file = data->files[i];
1072 int change = file->added + file->deleted;
1073 fill_print_name(file);
1074 len = strlen(file->print_name);
1075 if (max_len < len)
1076 max_len = len;
1077
1078 if (file->is_binary || file->is_unmerged)
1079 continue;
1080 if (max_change < change)
1081 max_change = change;
1082 }
1083
1084 /* Compute the width of the graph part;
1085 * 10 is for one blank at the beginning of the line plus
1086 * " | count " between the name and the graph.
1087 *
1088 * From here on, name_width is the width of the name area,
1089 * and width is the width of the graph area.
1090 */
1091 name_width = (name_width < max_len) ? name_width : max_len;
1092 if (width < (name_width + 10) + max_change)
1093 width = width - (name_width + 10);
1094 else
1095 width = max_change;
1096
1097 for (i = 0; i < data->nr; i++) {
1098 const char *prefix = "";
1099 char *name = data->files[i]->print_name;
1100 int added = data->files[i]->added;
1101 int deleted = data->files[i]->deleted;
1102 int name_len;
1103
1104 /*
1105 * "scale" the filename
1106 */
1107 len = name_width;
1108 name_len = strlen(name);
1109 if (name_width < name_len) {
1110 char *slash;
1111 prefix = "...";
1112 len -= 3;
1113 name += name_len - len;
1114 slash = strchr(name, '/');
1115 if (slash)
1116 name = slash;
1117 }
1118
1119 if (data->files[i]->is_binary) {
1120 show_name(options->file, prefix, name, len);
1121 fprintf(options->file, " Bin ");
1122 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
1123 fprintf(options->file, " -> ");
1124 fprintf(options->file, "%s%d%s", add_c, added, reset);
1125 fprintf(options->file, " bytes");
1126 fprintf(options->file, "\n");
1127 continue;
1128 }
1129 else if (data->files[i]->is_unmerged) {
1130 show_name(options->file, prefix, name, len);
1131 fprintf(options->file, " Unmerged\n");
1132 continue;
1133 }
1134 else if (!data->files[i]->is_renamed &&
1135 (added + deleted == 0)) {
1136 total_files--;
1137 continue;
1138 }
1139
1140 /*
1141 * scale the add/delete
1142 */
1143 add = added;
1144 del = deleted;
1145 adds += add;
1146 dels += del;
1147
1148 if (width <= max_change) {
1149 add = scale_linear(add, width, max_change);
1150 del = scale_linear(del, width, max_change);
1151 }
1152 show_name(options->file, prefix, name, len);
1153 fprintf(options->file, "%5d%s", added + deleted,
1154 added + deleted ? " " : "");
1155 show_graph(options->file, '+', add, add_c, reset);
1156 show_graph(options->file, '-', del, del_c, reset);
1157 fprintf(options->file, "\n");
1158 }
1159 fprintf(options->file,
1160 " %d files changed, %d insertions(+), %d deletions(-)\n",
1161 total_files, adds, dels);
1162 }
1163
1164 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1165 {
1166 int i, adds = 0, dels = 0, total_files = data->nr;
1167
1168 if (data->nr == 0)
1169 return;
1170
1171 for (i = 0; i < data->nr; i++) {
1172 if (!data->files[i]->is_binary &&
1173 !data->files[i]->is_unmerged) {
1174 int added = data->files[i]->added;
1175 int deleted= data->files[i]->deleted;
1176 if (!data->files[i]->is_renamed &&
1177 (added + deleted == 0)) {
1178 total_files--;
1179 } else {
1180 adds += added;
1181 dels += deleted;
1182 }
1183 }
1184 }
1185 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1186 total_files, adds, dels);
1187 }
1188
1189 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1190 {
1191 int i;
1192
1193 if (data->nr == 0)
1194 return;
1195
1196 for (i = 0; i < data->nr; i++) {
1197 struct diffstat_file *file = data->files[i];
1198
1199 if (file->is_binary)
1200 fprintf(options->file, "-\t-\t");
1201 else
1202 fprintf(options->file,
1203 "%d\t%d\t", file->added, file->deleted);
1204 if (options->line_termination) {
1205 fill_print_name(file);
1206 if (!file->is_renamed)
1207 write_name_quoted(file->name, options->file,
1208 options->line_termination);
1209 else {
1210 fputs(file->print_name, options->file);
1211 putc(options->line_termination, options->file);
1212 }
1213 } else {
1214 if (file->is_renamed) {
1215 putc('\0', options->file);
1216 write_name_quoted(file->from_name, options->file, '\0');
1217 }
1218 write_name_quoted(file->name, options->file, '\0');
1219 }
1220 }
1221 }
1222
1223 struct dirstat_file {
1224 const char *name;
1225 unsigned long changed;
1226 };
1227
1228 struct dirstat_dir {
1229 struct dirstat_file *files;
1230 int alloc, nr, percent, cumulative;
1231 };
1232
1233 static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
1234 {
1235 unsigned long this_dir = 0;
1236 unsigned int sources = 0;
1237
1238 while (dir->nr) {
1239 struct dirstat_file *f = dir->files;
1240 int namelen = strlen(f->name);
1241 unsigned long this;
1242 char *slash;
1243
1244 if (namelen < baselen)
1245 break;
1246 if (memcmp(f->name, base, baselen))
1247 break;
1248 slash = strchr(f->name + baselen, '/');
1249 if (slash) {
1250 int newbaselen = slash + 1 - f->name;
1251 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
1252 sources++;
1253 } else {
1254 this = f->changed;
1255 dir->files++;
1256 dir->nr--;
1257 sources += 2;
1258 }
1259 this_dir += this;
1260 }
1261
1262 /*
1263 * We don't report dirstat's for
1264 * - the top level
1265 * - or cases where everything came from a single directory
1266 * under this directory (sources == 1).
1267 */
1268 if (baselen && sources != 1) {
1269 int permille = this_dir * 1000 / changed;
1270 if (permille) {
1271 int percent = permille / 10;
1272 if (percent >= dir->percent) {
1273 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1274 if (!dir->cumulative)
1275 return 0;
1276 }
1277 }
1278 }
1279 return this_dir;
1280 }
1281
1282 static int dirstat_compare(const void *_a, const void *_b)
1283 {
1284 const struct dirstat_file *a = _a;
1285 const struct dirstat_file *b = _b;
1286 return strcmp(a->name, b->name);
1287 }
1288
1289 static void show_dirstat(struct diff_options *options)
1290 {
1291 int i;
1292 unsigned long changed;
1293 struct dirstat_dir dir;
1294 struct diff_queue_struct *q = &diff_queued_diff;
1295
1296 dir.files = NULL;
1297 dir.alloc = 0;
1298 dir.nr = 0;
1299 dir.percent = options->dirstat_percent;
1300 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1301
1302 changed = 0;
1303 for (i = 0; i < q->nr; i++) {
1304 struct diff_filepair *p = q->queue[i];
1305 const char *name;
1306 unsigned long copied, added, damage;
1307
1308 name = p->one->path ? p->one->path : p->two->path;
1309
1310 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1311 diff_populate_filespec(p->one, 0);
1312 diff_populate_filespec(p->two, 0);
1313 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1314 &copied, &added);
1315 diff_free_filespec_data(p->one);
1316 diff_free_filespec_data(p->two);
1317 } else if (DIFF_FILE_VALID(p->one)) {
1318 diff_populate_filespec(p->one, 1);
1319 copied = added = 0;
1320 diff_free_filespec_data(p->one);
1321 } else if (DIFF_FILE_VALID(p->two)) {
1322 diff_populate_filespec(p->two, 1);
1323 copied = 0;
1324 added = p->two->size;
1325 diff_free_filespec_data(p->two);
1326 } else
1327 continue;
1328
1329 /*
1330 * Original minus copied is the removed material,
1331 * added is the new material. They are both damages
1332 * made to the preimage. In --dirstat-by-file mode, count
1333 * damaged files, not damaged lines. This is done by
1334 * counting only a single damaged line per file.
1335 */
1336 damage = (p->one->size - copied) + added;
1337 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1338 damage = 1;
1339
1340 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1341 dir.files[dir.nr].name = name;
1342 dir.files[dir.nr].changed = damage;
1343 changed += damage;
1344 dir.nr++;
1345 }
1346
1347 /* This can happen even with many files, if everything was renames */
1348 if (!changed)
1349 return;
1350
1351 /* Show all directories with more than x% of the changes */
1352 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1353 gather_dirstat(options->file, &dir, changed, "", 0);
1354 }
1355
1356 static void free_diffstat_info(struct diffstat_t *diffstat)
1357 {
1358 int i;
1359 for (i = 0; i < diffstat->nr; i++) {
1360 struct diffstat_file *f = diffstat->files[i];
1361 if (f->name != f->print_name)
1362 free(f->print_name);
1363 free(f->name);
1364 free(f->from_name);
1365 free(f);
1366 }
1367 free(diffstat->files);
1368 }
1369
1370 struct checkdiff_t {
1371 const char *filename;
1372 int lineno;
1373 struct diff_options *o;
1374 unsigned ws_rule;
1375 unsigned status;
1376 };
1377
1378 static int is_conflict_marker(const char *line, unsigned long len)
1379 {
1380 char firstchar;
1381 int cnt;
1382
1383 if (len < 8)
1384 return 0;
1385 firstchar = line[0];
1386 switch (firstchar) {
1387 case '=': case '>': case '<':
1388 break;
1389 default:
1390 return 0;
1391 }
1392 for (cnt = 1; cnt < 7; cnt++)
1393 if (line[cnt] != firstchar)
1394 return 0;
1395 /* line[0] thru line[6] are same as firstchar */
1396 if (firstchar == '=') {
1397 /* divider between ours and theirs? */
1398 if (len != 8 || line[7] != '\n')
1399 return 0;
1400 } else if (len < 8 || !isspace(line[7])) {
1401 /* not divider before ours nor after theirs */
1402 return 0;
1403 }
1404 return 1;
1405 }
1406
1407 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1408 {
1409 struct checkdiff_t *data = priv;
1410 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1411 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1412 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1413 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1414 char *err;
1415
1416 if (line[0] == '+') {
1417 unsigned bad;
1418 data->lineno++;
1419 if (is_conflict_marker(line + 1, len - 1)) {
1420 data->status |= 1;
1421 fprintf(data->o->file,
1422 "%s:%d: leftover conflict marker\n",
1423 data->filename, data->lineno);
1424 }
1425 bad = ws_check(line + 1, len - 1, data->ws_rule);
1426 if (!bad)
1427 return;
1428 data->status |= bad;
1429 err = whitespace_error_string(bad);
1430 fprintf(data->o->file, "%s:%d: %s.\n",
1431 data->filename, data->lineno, err);
1432 free(err);
1433 emit_line(data->o->file, set, reset, line, 1);
1434 ws_check_emit(line + 1, len - 1, data->ws_rule,
1435 data->o->file, set, reset, ws);
1436 } else if (line[0] == ' ') {
1437 data->lineno++;
1438 } else if (line[0] == '@') {
1439 char *plus = strchr(line, '+');
1440 if (plus)
1441 data->lineno = strtol(plus, NULL, 10) - 1;
1442 else
1443 die("invalid diff");
1444 }
1445 }
1446
1447 static unsigned char *deflate_it(char *data,
1448 unsigned long size,
1449 unsigned long *result_size)
1450 {
1451 int bound;
1452 unsigned char *deflated;
1453 z_stream stream;
1454
1455 memset(&stream, 0, sizeof(stream));
1456 deflateInit(&stream, zlib_compression_level);
1457 bound = deflateBound(&stream, size);
1458 deflated = xmalloc(bound);
1459 stream.next_out = deflated;
1460 stream.avail_out = bound;
1461
1462 stream.next_in = (unsigned char *)data;
1463 stream.avail_in = size;
1464 while (deflate(&stream, Z_FINISH) == Z_OK)
1465 ; /* nothing */
1466 deflateEnd(&stream);
1467 *result_size = stream.total_out;
1468 return deflated;
1469 }
1470
1471 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
1472 {
1473 void *cp;
1474 void *delta;
1475 void *deflated;
1476 void *data;
1477 unsigned long orig_size;
1478 unsigned long delta_size;
1479 unsigned long deflate_size;
1480 unsigned long data_size;
1481
1482 /* We could do deflated delta, or we could do just deflated two,
1483 * whichever is smaller.
1484 */
1485 delta = NULL;
1486 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1487 if (one->size && two->size) {
1488 delta = diff_delta(one->ptr, one->size,
1489 two->ptr, two->size,
1490 &delta_size, deflate_size);
1491 if (delta) {
1492 void *to_free = delta;
1493 orig_size = delta_size;
1494 delta = deflate_it(delta, delta_size, &delta_size);
1495 free(to_free);
1496 }
1497 }
1498
1499 if (delta && delta_size < deflate_size) {
1500 fprintf(file, "delta %lu\n", orig_size);
1501 free(deflated);
1502 data = delta;
1503 data_size = delta_size;
1504 }
1505 else {
1506 fprintf(file, "literal %lu\n", two->size);
1507 free(delta);
1508 data = deflated;
1509 data_size = deflate_size;
1510 }
1511
1512 /* emit data encoded in base85 */
1513 cp = data;
1514 while (data_size) {
1515 int bytes = (52 < data_size) ? 52 : data_size;
1516 char line[70];
1517 data_size -= bytes;
1518 if (bytes <= 26)
1519 line[0] = bytes + 'A' - 1;
1520 else
1521 line[0] = bytes - 26 + 'a' - 1;
1522 encode_85(line + 1, cp, bytes);
1523 cp = (char *) cp + bytes;
1524 fputs(line, file);
1525 fputc('\n', file);
1526 }
1527 fprintf(file, "\n");
1528 free(data);
1529 }
1530
1531 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
1532 {
1533 fprintf(file, "GIT binary patch\n");
1534 emit_binary_diff_body(file, one, two);
1535 emit_binary_diff_body(file, two, one);
1536 }
1537
1538 static void diff_filespec_load_driver(struct diff_filespec *one)
1539 {
1540 if (!one->driver)
1541 one->driver = userdiff_find_by_path(one->path);
1542 if (!one->driver)
1543 one->driver = userdiff_find_by_name("default");
1544 }
1545
1546 int diff_filespec_is_binary(struct diff_filespec *one)
1547 {
1548 if (one->is_binary == -1) {
1549 diff_filespec_load_driver(one);
1550 if (one->driver->binary != -1)
1551 one->is_binary = one->driver->binary;
1552 else {
1553 if (!one->data && DIFF_FILE_VALID(one))
1554 diff_populate_filespec(one, 0);
1555 if (one->data)
1556 one->is_binary = buffer_is_binary(one->data,
1557 one->size);
1558 if (one->is_binary == -1)
1559 one->is_binary = 0;
1560 }
1561 }
1562 return one->is_binary;
1563 }
1564
1565 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1566 {
1567 diff_filespec_load_driver(one);
1568 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1569 }
1570
1571 static const char *userdiff_word_regex(struct diff_filespec *one)
1572 {
1573 diff_filespec_load_driver(one);
1574 return one->driver->word_regex;
1575 }
1576
1577 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1578 {
1579 if (!options->a_prefix)
1580 options->a_prefix = a;
1581 if (!options->b_prefix)
1582 options->b_prefix = b;
1583 }
1584
1585 static const char *get_textconv(struct diff_filespec *one)
1586 {
1587 if (!DIFF_FILE_VALID(one))
1588 return NULL;
1589 if (!S_ISREG(one->mode))
1590 return NULL;
1591 diff_filespec_load_driver(one);
1592 return one->driver->textconv;
1593 }
1594
1595 static void builtin_diff(const char *name_a,
1596 const char *name_b,
1597 struct diff_filespec *one,
1598 struct diff_filespec *two,
1599 const char *xfrm_msg,
1600 struct diff_options *o,
1601 int complete_rewrite)
1602 {
1603 mmfile_t mf1, mf2;
1604 const char *lbl[2];
1605 char *a_one, *b_two;
1606 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1607 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1608 const char *a_prefix, *b_prefix;
1609 const char *textconv_one = NULL, *textconv_two = NULL;
1610 struct strbuf header = STRBUF_INIT;
1611
1612 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
1613 (!one->mode || S_ISGITLINK(one->mode)) &&
1614 (!two->mode || S_ISGITLINK(two->mode))) {
1615 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
1616 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
1617 show_submodule_summary(o->file, one ? one->path : two->path,
1618 one->sha1, two->sha1,
1619 del, add, reset);
1620 return;
1621 }
1622
1623 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1624 textconv_one = get_textconv(one);
1625 textconv_two = get_textconv(two);
1626 }
1627
1628 diff_set_mnemonic_prefix(o, "a/", "b/");
1629 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1630 a_prefix = o->b_prefix;
1631 b_prefix = o->a_prefix;
1632 } else {
1633 a_prefix = o->a_prefix;
1634 b_prefix = o->b_prefix;
1635 }
1636
1637 /* Never use a non-valid filename anywhere if at all possible */
1638 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1639 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1640
1641 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1642 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1643 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1644 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1645 strbuf_addf(&header, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1646 if (lbl[0][0] == '/') {
1647 /* /dev/null */
1648 strbuf_addf(&header, "%snew file mode %06o%s\n", set, two->mode, reset);
1649 if (xfrm_msg && xfrm_msg[0])
1650 strbuf_addf(&header, "%s%s%s\n", set, xfrm_msg, reset);
1651 }
1652 else if (lbl[1][0] == '/') {
1653 strbuf_addf(&header, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1654 if (xfrm_msg && xfrm_msg[0])
1655 strbuf_addf(&header, "%s%s%s\n", set, xfrm_msg, reset);
1656 }
1657 else {
1658 if (one->mode != two->mode) {
1659 strbuf_addf(&header, "%sold mode %06o%s\n", set, one->mode, reset);
1660 strbuf_addf(&header, "%snew mode %06o%s\n", set, two->mode, reset);
1661 }
1662 if (xfrm_msg && xfrm_msg[0])
1663 strbuf_addf(&header, "%s%s%s\n", set, xfrm_msg, reset);
1664
1665 /*
1666 * we do not run diff between different kind
1667 * of objects.
1668 */
1669 if ((one->mode ^ two->mode) & S_IFMT)
1670 goto free_ab_and_return;
1671 if (complete_rewrite &&
1672 (textconv_one || !diff_filespec_is_binary(one)) &&
1673 (textconv_two || !diff_filespec_is_binary(two))) {
1674 fprintf(o->file, "%s", header.buf);
1675 strbuf_reset(&header);
1676 emit_rewrite_diff(name_a, name_b, one, two,
1677 textconv_one, textconv_two, o);
1678 o->found_changes = 1;
1679 goto free_ab_and_return;
1680 }
1681 }
1682
1683 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1684 die("unable to read files to diff");
1685
1686 if (!DIFF_OPT_TST(o, TEXT) &&
1687 ( (diff_filespec_is_binary(one) && !textconv_one) ||
1688 (diff_filespec_is_binary(two) && !textconv_two) )) {
1689 /* Quite common confusing case */
1690 if (mf1.size == mf2.size &&
1691 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1692 goto free_ab_and_return;
1693 fprintf(o->file, "%s", header.buf);
1694 strbuf_reset(&header);
1695 if (DIFF_OPT_TST(o, BINARY))
1696 emit_binary_diff(o->file, &mf1, &mf2);
1697 else
1698 fprintf(o->file, "Binary files %s and %s differ\n",
1699 lbl[0], lbl[1]);
1700 o->found_changes = 1;
1701 }
1702 else {
1703 /* Crazy xdl interfaces.. */
1704 const char *diffopts = getenv("GIT_DIFF_OPTS");
1705 xpparam_t xpp;
1706 xdemitconf_t xecfg;
1707 xdemitcb_t ecb;
1708 struct emit_callback ecbdata;
1709 const struct userdiff_funcname *pe;
1710
1711 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS)) {
1712 fprintf(o->file, "%s", header.buf);
1713 strbuf_reset(&header);
1714 }
1715
1716 if (textconv_one) {
1717 size_t size;
1718 mf1.ptr = run_textconv(textconv_one, one, &size);
1719 if (!mf1.ptr)
1720 die("unable to read files to diff");
1721 mf1.size = size;
1722 }
1723 if (textconv_two) {
1724 size_t size;
1725 mf2.ptr = run_textconv(textconv_two, two, &size);
1726 if (!mf2.ptr)
1727 die("unable to read files to diff");
1728 mf2.size = size;
1729 }
1730
1731 pe = diff_funcname_pattern(one);
1732 if (!pe)
1733 pe = diff_funcname_pattern(two);
1734
1735 memset(&xpp, 0, sizeof(xpp));
1736 memset(&xecfg, 0, sizeof(xecfg));
1737 memset(&ecbdata, 0, sizeof(ecbdata));
1738 ecbdata.label_path = lbl;
1739 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1740 ecbdata.found_changesp = &o->found_changes;
1741 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1742 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
1743 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1744 ecbdata.file = o->file;
1745 ecbdata.header = header.len ? &header : NULL;
1746 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1747 xecfg.ctxlen = o->context;
1748 xecfg.interhunkctxlen = o->interhunkcontext;
1749 xecfg.flags = XDL_EMIT_FUNCNAMES;
1750 if (pe)
1751 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1752 if (!diffopts)
1753 ;
1754 else if (!prefixcmp(diffopts, "--unified="))
1755 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1756 else if (!prefixcmp(diffopts, "-u"))
1757 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1758 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1759 ecbdata.diff_words =
1760 xcalloc(1, sizeof(struct diff_words_data));
1761 ecbdata.diff_words->file = o->file;
1762 if (!o->word_regex)
1763 o->word_regex = userdiff_word_regex(one);
1764 if (!o->word_regex)
1765 o->word_regex = userdiff_word_regex(two);
1766 if (!o->word_regex)
1767 o->word_regex = diff_word_regex_cfg;
1768 if (o->word_regex) {
1769 ecbdata.diff_words->word_regex = (regex_t *)
1770 xmalloc(sizeof(regex_t));
1771 if (regcomp(ecbdata.diff_words->word_regex,
1772 o->word_regex,
1773 REG_EXTENDED | REG_NEWLINE))
1774 die ("Invalid regular expression: %s",
1775 o->word_regex);
1776 }
1777 }
1778 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
1779 &xpp, &xecfg, &ecb);
1780 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1781 free_diff_words_data(&ecbdata);
1782 if (textconv_one)
1783 free(mf1.ptr);
1784 if (textconv_two)
1785 free(mf2.ptr);
1786 xdiff_clear_find_func(&xecfg);
1787 }
1788
1789 free_ab_and_return:
1790 strbuf_release(&header);
1791 diff_free_filespec_data(one);
1792 diff_free_filespec_data(two);
1793 free(a_one);
1794 free(b_two);
1795 return;
1796 }
1797
1798 static void builtin_diffstat(const char *name_a, const char *name_b,
1799 struct diff_filespec *one,
1800 struct diff_filespec *two,
1801 struct diffstat_t *diffstat,
1802 struct diff_options *o,
1803 int complete_rewrite)
1804 {
1805 mmfile_t mf1, mf2;
1806 struct diffstat_file *data;
1807
1808 data = diffstat_add(diffstat, name_a, name_b);
1809
1810 if (!one || !two) {
1811 data->is_unmerged = 1;
1812 return;
1813 }
1814 if (complete_rewrite) {
1815 diff_populate_filespec(one, 0);
1816 diff_populate_filespec(two, 0);
1817 data->deleted = count_lines(one->data, one->size);
1818 data->added = count_lines(two->data, two->size);
1819 goto free_and_return;
1820 }
1821 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1822 die("unable to read files to diff");
1823
1824 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1825 data->is_binary = 1;
1826 data->added = mf2.size;
1827 data->deleted = mf1.size;
1828 } else {
1829 /* Crazy xdl interfaces.. */
1830 xpparam_t xpp;
1831 xdemitconf_t xecfg;
1832 xdemitcb_t ecb;
1833
1834 memset(&xpp, 0, sizeof(xpp));
1835 memset(&xecfg, 0, sizeof(xecfg));
1836 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1837 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
1838 &xpp, &xecfg, &ecb);
1839 }
1840
1841 free_and_return:
1842 diff_free_filespec_data(one);
1843 diff_free_filespec_data(two);
1844 }
1845
1846 static void builtin_checkdiff(const char *name_a, const char *name_b,
1847 const char *attr_path,
1848 struct diff_filespec *one,
1849 struct diff_filespec *two,
1850 struct diff_options *o)
1851 {
1852 mmfile_t mf1, mf2;
1853 struct checkdiff_t data;
1854
1855 if (!two)
1856 return;
1857
1858 memset(&data, 0, sizeof(data));
1859 data.filename = name_b ? name_b : name_a;
1860 data.lineno = 0;
1861 data.o = o;
1862 data.ws_rule = whitespace_rule(attr_path);
1863
1864 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1865 die("unable to read files to diff");
1866
1867 /*
1868 * All the other codepaths check both sides, but not checking
1869 * the "old" side here is deliberate. We are checking the newly
1870 * introduced changes, and as long as the "new" side is text, we
1871 * can and should check what it introduces.
1872 */
1873 if (diff_filespec_is_binary(two))
1874 goto free_and_return;
1875 else {
1876 /* Crazy xdl interfaces.. */
1877 xpparam_t xpp;
1878 xdemitconf_t xecfg;
1879 xdemitcb_t ecb;
1880
1881 memset(&xpp, 0, sizeof(xpp));
1882 memset(&xecfg, 0, sizeof(xecfg));
1883 xecfg.ctxlen = 1; /* at least one context line */
1884 xpp.flags = XDF_NEED_MINIMAL;
1885 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
1886 &xpp, &xecfg, &ecb);
1887
1888 if (data.ws_rule & WS_BLANK_AT_EOF) {
1889 struct emit_callback ecbdata;
1890 int blank_at_eof;
1891
1892 ecbdata.ws_rule = data.ws_rule;
1893 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1894 blank_at_eof = ecbdata.blank_at_eof_in_preimage;
1895
1896 if (blank_at_eof) {
1897 static char *err;
1898 if (!err)
1899 err = whitespace_error_string(WS_BLANK_AT_EOF);
1900 fprintf(o->file, "%s:%d: %s.\n",
1901 data.filename, blank_at_eof, err);
1902 data.status = 1; /* report errors */
1903 }
1904 }
1905 }
1906 free_and_return:
1907 diff_free_filespec_data(one);
1908 diff_free_filespec_data(two);
1909 if (data.status)
1910 DIFF_OPT_SET(o, CHECK_FAILED);
1911 }
1912
1913 struct diff_filespec *alloc_filespec(const char *path)
1914 {
1915 int namelen = strlen(path);
1916 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1917
1918 memset(spec, 0, sizeof(*spec));
1919 spec->path = (char *)(spec + 1);
1920 memcpy(spec->path, path, namelen+1);
1921 spec->count = 1;
1922 spec->is_binary = -1;
1923 return spec;
1924 }
1925
1926 void free_filespec(struct diff_filespec *spec)
1927 {
1928 if (!--spec->count) {
1929 diff_free_filespec_data(spec);
1930 free(spec);
1931 }
1932 }
1933
1934 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1935 unsigned short mode)
1936 {
1937 if (mode) {
1938 spec->mode = canon_mode(mode);
1939 hashcpy(spec->sha1, sha1);
1940 spec->sha1_valid = !is_null_sha1(sha1);
1941 }
1942 }
1943
1944 /*
1945 * Given a name and sha1 pair, if the index tells us the file in
1946 * the work tree has that object contents, return true, so that
1947 * prepare_temp_file() does not have to inflate and extract.
1948 */
1949 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1950 {
1951 struct cache_entry *ce;
1952 struct stat st;
1953 int pos, len;
1954
1955 /*
1956 * We do not read the cache ourselves here, because the
1957 * benchmark with my previous version that always reads cache
1958 * shows that it makes things worse for diff-tree comparing
1959 * two linux-2.6 kernel trees in an already checked out work
1960 * tree. This is because most diff-tree comparisons deal with
1961 * only a small number of files, while reading the cache is
1962 * expensive for a large project, and its cost outweighs the
1963 * savings we get by not inflating the object to a temporary
1964 * file. Practically, this code only helps when we are used
1965 * by diff-cache --cached, which does read the cache before
1966 * calling us.
1967 */
1968 if (!active_cache)
1969 return 0;
1970
1971 /* We want to avoid the working directory if our caller
1972 * doesn't need the data in a normal file, this system
1973 * is rather slow with its stat/open/mmap/close syscalls,
1974 * and the object is contained in a pack file. The pack
1975 * is probably already open and will be faster to obtain
1976 * the data through than the working directory. Loose
1977 * objects however would tend to be slower as they need
1978 * to be individually opened and inflated.
1979 */
1980 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
1981 return 0;
1982
1983 len = strlen(name);
1984 pos = cache_name_pos(name, len);
1985 if (pos < 0)
1986 return 0;
1987 ce = active_cache[pos];
1988
1989 /*
1990 * This is not the sha1 we are looking for, or
1991 * unreusable because it is not a regular file.
1992 */
1993 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1994 return 0;
1995
1996 /*
1997 * If ce is marked as "assume unchanged", there is no
1998 * guarantee that work tree matches what we are looking for.
1999 */
2000 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2001 return 0;
2002
2003 /*
2004 * If ce matches the file in the work tree, we can reuse it.
2005 */
2006 if (ce_uptodate(ce) ||
2007 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2008 return 1;
2009
2010 return 0;
2011 }
2012
2013 static int populate_from_stdin(struct diff_filespec *s)
2014 {
2015 struct strbuf buf = STRBUF_INIT;
2016 size_t size = 0;
2017
2018 if (strbuf_read(&buf, 0, 0) < 0)
2019 return error("error while reading from stdin %s",
2020 strerror(errno));
2021
2022 s->should_munmap = 0;
2023 s->data = strbuf_detach(&buf, &size);
2024 s->size = size;
2025 s->should_free = 1;
2026 return 0;
2027 }
2028
2029 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2030 {
2031 int len;
2032 char *data = xmalloc(100), *dirty = "";
2033
2034 /* Are we looking at the work tree? */
2035 if (!s->sha1_valid && s->dirty_submodule)
2036 dirty = "-dirty";
2037
2038 len = snprintf(data, 100,
2039 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2040 s->data = data;
2041 s->size = len;
2042 s->should_free = 1;
2043 if (size_only) {
2044 s->data = NULL;
2045 free(data);
2046 }
2047 return 0;
2048 }
2049
2050 /*
2051 * While doing rename detection and pickaxe operation, we may need to
2052 * grab the data for the blob (or file) for our own in-core comparison.
2053 * diff_filespec has data and size fields for this purpose.
2054 */
2055 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2056 {
2057 int err = 0;
2058 if (!DIFF_FILE_VALID(s))
2059 die("internal error: asking to populate invalid file.");
2060 if (S_ISDIR(s->mode))
2061 return -1;
2062
2063 if (s->data)
2064 return 0;
2065
2066 if (size_only && 0 < s->size)
2067 return 0;
2068
2069 if (S_ISGITLINK(s->mode))
2070 return diff_populate_gitlink(s, size_only);
2071
2072 if (!s->sha1_valid ||
2073 reuse_worktree_file(s->path, s->sha1, 0)) {
2074 struct strbuf buf = STRBUF_INIT;
2075 struct stat st;
2076 int fd;
2077
2078 if (!strcmp(s->path, "-"))
2079 return populate_from_stdin(s);
2080
2081 if (lstat(s->path, &st) < 0) {
2082 if (errno == ENOENT) {
2083 err_empty:
2084 err = -1;
2085 empty:
2086 s->data = (char *)"";
2087 s->size = 0;
2088 return err;
2089 }
2090 }
2091 s->size = xsize_t(st.st_size);
2092 if (!s->size)
2093 goto empty;
2094 if (S_ISLNK(st.st_mode)) {
2095 struct strbuf sb = STRBUF_INIT;
2096
2097 if (strbuf_readlink(&sb, s->path, s->size))
2098 goto err_empty;
2099 s->size = sb.len;
2100 s->data = strbuf_detach(&sb, NULL);
2101 s->should_free = 1;
2102 return 0;
2103 }
2104 if (size_only)
2105 return 0;
2106 fd = open(s->path, O_RDONLY);
2107 if (fd < 0)
2108 goto err_empty;
2109 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2110 close(fd);
2111 s->should_munmap = 1;
2112
2113 /*
2114 * Convert from working tree format to canonical git format
2115 */
2116 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2117 size_t size = 0;
2118 munmap(s->data, s->size);
2119 s->should_munmap = 0;
2120 s->data = strbuf_detach(&buf, &size);
2121 s->size = size;
2122 s->should_free = 1;
2123 }
2124 }
2125 else {
2126 enum object_type type;
2127 if (size_only)
2128 type = sha1_object_info(s->sha1, &s->size);
2129 else {
2130 s->data = read_sha1_file(s->sha1, &type, &s->size);
2131 s->should_free = 1;
2132 }
2133 }
2134 return 0;
2135 }
2136
2137 void diff_free_filespec_blob(struct diff_filespec *s)
2138 {
2139 if (s->should_free)
2140 free(s->data);
2141 else if (s->should_munmap)
2142 munmap(s->data, s->size);
2143
2144 if (s->should_free || s->should_munmap) {
2145 s->should_free = s->should_munmap = 0;
2146 s->data = NULL;
2147 }
2148 }
2149
2150 void diff_free_filespec_data(struct diff_filespec *s)
2151 {
2152 diff_free_filespec_blob(s);
2153 free(s->cnt_data);
2154 s->cnt_data = NULL;
2155 }
2156
2157 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2158 void *blob,
2159 unsigned long size,
2160 const unsigned char *sha1,
2161 int mode)
2162 {
2163 int fd;
2164 struct strbuf buf = STRBUF_INIT;
2165 struct strbuf template = STRBUF_INIT;
2166 char *path_dup = xstrdup(path);
2167 const char *base = basename(path_dup);
2168
2169 /* Generate "XXXXXX_basename.ext" */
2170 strbuf_addstr(&template, "XXXXXX_");
2171 strbuf_addstr(&template, base);
2172
2173 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2174 strlen(base) + 1);
2175 if (fd < 0)
2176 die_errno("unable to create temp-file");
2177 if (convert_to_working_tree(path,
2178 (const char *)blob, (size_t)size, &buf)) {
2179 blob = buf.buf;
2180 size = buf.len;
2181 }
2182 if (write_in_full(fd, blob, size) != size)
2183 die_errno("unable to write temp-file");
2184 close(fd);
2185 temp->name = temp->tmp_path;
2186 strcpy(temp->hex, sha1_to_hex(sha1));
2187 temp->hex[40] = 0;
2188 sprintf(temp->mode, "%06o", mode);
2189 strbuf_release(&buf);
2190 strbuf_release(&template);
2191 free(path_dup);
2192 }
2193
2194 static struct diff_tempfile *prepare_temp_file(const char *name,
2195 struct diff_filespec *one)
2196 {
2197 struct diff_tempfile *temp = claim_diff_tempfile();
2198
2199 if (!DIFF_FILE_VALID(one)) {
2200 not_a_valid_file:
2201 /* A '-' entry produces this for file-2, and
2202 * a '+' entry produces this for file-1.
2203 */
2204 temp->name = "/dev/null";
2205 strcpy(temp->hex, ".");
2206 strcpy(temp->mode, ".");
2207 return temp;
2208 }
2209
2210 if (!remove_tempfile_installed) {
2211 atexit(remove_tempfile);
2212 sigchain_push_common(remove_tempfile_on_signal);
2213 remove_tempfile_installed = 1;
2214 }
2215
2216 if (!one->sha1_valid ||
2217 reuse_worktree_file(name, one->sha1, 1)) {
2218 struct stat st;
2219 if (lstat(name, &st) < 0) {
2220 if (errno == ENOENT)
2221 goto not_a_valid_file;
2222 die_errno("stat(%s)", name);
2223 }
2224 if (S_ISLNK(st.st_mode)) {
2225 struct strbuf sb = STRBUF_INIT;
2226 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2227 die_errno("readlink(%s)", name);
2228 prep_temp_blob(name, temp, sb.buf, sb.len,
2229 (one->sha1_valid ?
2230 one->sha1 : null_sha1),
2231 (one->sha1_valid ?
2232 one->mode : S_IFLNK));
2233 strbuf_release(&sb);
2234 }
2235 else {
2236 /* we can borrow from the file in the work tree */
2237 temp->name = name;
2238 if (!one->sha1_valid)
2239 strcpy(temp->hex, sha1_to_hex(null_sha1));
2240 else
2241 strcpy(temp->hex, sha1_to_hex(one->sha1));
2242 /* Even though we may sometimes borrow the
2243 * contents from the work tree, we always want
2244 * one->mode. mode is trustworthy even when
2245 * !(one->sha1_valid), as long as
2246 * DIFF_FILE_VALID(one).
2247 */
2248 sprintf(temp->mode, "%06o", one->mode);
2249 }
2250 return temp;
2251 }
2252 else {
2253 if (diff_populate_filespec(one, 0))
2254 die("cannot read data blob for %s", one->path);
2255 prep_temp_blob(name, temp, one->data, one->size,
2256 one->sha1, one->mode);
2257 }
2258 return temp;
2259 }
2260
2261 /* An external diff command takes:
2262 *
2263 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2264 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2265 *
2266 */
2267 static void run_external_diff(const char *pgm,
2268 const char *name,
2269 const char *other,
2270 struct diff_filespec *one,
2271 struct diff_filespec *two,
2272 const char *xfrm_msg,
2273 int complete_rewrite)
2274 {
2275 const char *spawn_arg[10];
2276 int retval;
2277 const char **arg = &spawn_arg[0];
2278
2279 if (one && two) {
2280 struct diff_tempfile *temp_one, *temp_two;
2281 const char *othername = (other ? other : name);
2282 temp_one = prepare_temp_file(name, one);
2283 temp_two = prepare_temp_file(othername, two);
2284 *arg++ = pgm;
2285 *arg++ = name;
2286 *arg++ = temp_one->name;
2287 *arg++ = temp_one->hex;
2288 *arg++ = temp_one->mode;
2289 *arg++ = temp_two->name;
2290 *arg++ = temp_two->hex;
2291 *arg++ = temp_two->mode;
2292 if (other) {
2293 *arg++ = other;
2294 *arg++ = xfrm_msg;
2295 }
2296 } else {
2297 *arg++ = pgm;
2298 *arg++ = name;
2299 }
2300 *arg = NULL;
2301 fflush(NULL);
2302 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2303 remove_tempfile();
2304 if (retval) {
2305 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2306 exit(1);
2307 }
2308 }
2309
2310 static int similarity_index(struct diff_filepair *p)
2311 {
2312 return p->score * 100 / MAX_SCORE;
2313 }
2314
2315 static void fill_metainfo(struct strbuf *msg,
2316 const char *name,
2317 const char *other,
2318 struct diff_filespec *one,
2319 struct diff_filespec *two,
2320 struct diff_options *o,
2321 struct diff_filepair *p)
2322 {
2323 strbuf_init(msg, PATH_MAX * 2 + 300);
2324 switch (p->status) {
2325 case DIFF_STATUS_COPIED:
2326 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2327 strbuf_addstr(msg, "\ncopy from ");
2328 quote_c_style(name, msg, NULL, 0);
2329 strbuf_addstr(msg, "\ncopy to ");
2330 quote_c_style(other, msg, NULL, 0);
2331 strbuf_addch(msg, '\n');
2332 break;
2333 case DIFF_STATUS_RENAMED:
2334 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2335 strbuf_addstr(msg, "\nrename from ");
2336 quote_c_style(name, msg, NULL, 0);
2337 strbuf_addstr(msg, "\nrename to ");
2338 quote_c_style(other, msg, NULL, 0);
2339 strbuf_addch(msg, '\n');
2340 break;
2341 case DIFF_STATUS_MODIFIED:
2342 if (p->score) {
2343 strbuf_addf(msg, "dissimilarity index %d%%\n",
2344 similarity_index(p));
2345 break;
2346 }
2347 /* fallthru */
2348 default:
2349 /* nothing */
2350 ;
2351 }
2352 if (one && two && hashcmp(one->sha1, two->sha1)) {
2353 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2354
2355 if (DIFF_OPT_TST(o, BINARY)) {
2356 mmfile_t mf;
2357 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2358 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2359 abbrev = 40;
2360 }
2361 strbuf_addf(msg, "index %.*s..%.*s",
2362 abbrev, sha1_to_hex(one->sha1),
2363 abbrev, sha1_to_hex(two->sha1));
2364 if (one->mode == two->mode)
2365 strbuf_addf(msg, " %06o", one->mode);
2366 strbuf_addch(msg, '\n');
2367 }
2368 if (msg->len)
2369 strbuf_setlen(msg, msg->len - 1);
2370 }
2371
2372 static void run_diff_cmd(const char *pgm,
2373 const char *name,
2374 const char *other,
2375 const char *attr_path,
2376 struct diff_filespec *one,
2377 struct diff_filespec *two,
2378 struct strbuf *msg,
2379 struct diff_options *o,
2380 struct diff_filepair *p)
2381 {
2382 const char *xfrm_msg = NULL;
2383 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2384
2385 if (msg) {
2386 fill_metainfo(msg, name, other, one, two, o, p);
2387 xfrm_msg = msg->len ? msg->buf : NULL;
2388 }
2389
2390 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2391 pgm = NULL;
2392 else {
2393 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2394 if (drv && drv->external)
2395 pgm = drv->external;
2396 }
2397
2398 if (pgm) {
2399 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2400 complete_rewrite);
2401 return;
2402 }
2403 if (one && two)
2404 builtin_diff(name, other ? other : name,
2405 one, two, xfrm_msg, o, complete_rewrite);
2406 else
2407 fprintf(o->file, "* Unmerged path %s\n", name);
2408 }
2409
2410 static void diff_fill_sha1_info(struct diff_filespec *one)
2411 {
2412 if (DIFF_FILE_VALID(one)) {
2413 if (!one->sha1_valid) {
2414 struct stat st;
2415 if (!strcmp(one->path, "-")) {
2416 hashcpy(one->sha1, null_sha1);
2417 return;
2418 }
2419 if (lstat(one->path, &st) < 0)
2420 die_errno("stat '%s'", one->path);
2421 if (index_path(one->sha1, one->path, &st, 0))
2422 die("cannot hash %s", one->path);
2423 }
2424 }
2425 else
2426 hashclr(one->sha1);
2427 }
2428
2429 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2430 {
2431 /* Strip the prefix but do not molest /dev/null and absolute paths */
2432 if (*namep && **namep != '/')
2433 *namep += prefix_length;
2434 if (*otherp && **otherp != '/')
2435 *otherp += prefix_length;
2436 }
2437
2438 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2439 {
2440 const char *pgm = external_diff();
2441 struct strbuf msg;
2442 struct diff_filespec *one = p->one;
2443 struct diff_filespec *two = p->two;
2444 const char *name;
2445 const char *other;
2446 const char *attr_path;
2447
2448 name = p->one->path;
2449 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2450 attr_path = name;
2451 if (o->prefix_length)
2452 strip_prefix(o->prefix_length, &name, &other);
2453
2454 if (DIFF_PAIR_UNMERGED(p)) {
2455 run_diff_cmd(pgm, name, NULL, attr_path,
2456 NULL, NULL, NULL, o, p);
2457 return;
2458 }
2459
2460 diff_fill_sha1_info(one);
2461 diff_fill_sha1_info(two);
2462
2463 if (!pgm &&
2464 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2465 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2466 /*
2467 * a filepair that changes between file and symlink
2468 * needs to be split into deletion and creation.
2469 */
2470 struct diff_filespec *null = alloc_filespec(two->path);
2471 run_diff_cmd(NULL, name, other, attr_path,
2472 one, null, &msg, o, p);
2473 free(null);
2474 strbuf_release(&msg);
2475
2476 null = alloc_filespec(one->path);
2477 run_diff_cmd(NULL, name, other, attr_path,
2478 null, two, &msg, o, p);
2479 free(null);
2480 }
2481 else
2482 run_diff_cmd(pgm, name, other, attr_path,
2483 one, two, &msg, o, p);
2484
2485 strbuf_release(&msg);
2486 }
2487
2488 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2489 struct diffstat_t *diffstat)
2490 {
2491 const char *name;
2492 const char *other;
2493 int complete_rewrite = 0;
2494
2495 if (DIFF_PAIR_UNMERGED(p)) {
2496 /* unmerged */
2497 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2498 return;
2499 }
2500
2501 name = p->one->path;
2502 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
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 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2511 complete_rewrite = 1;
2512 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2513 }
2514
2515 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2516 {
2517 const char *name;
2518 const char *other;
2519 const char *attr_path;
2520
2521 if (DIFF_PAIR_UNMERGED(p)) {
2522 /* unmerged */
2523 return;
2524 }
2525
2526 name = p->one->path;
2527 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2528 attr_path = other ? other : name;
2529
2530 if (o->prefix_length)
2531 strip_prefix(o->prefix_length, &name, &other);
2532
2533 diff_fill_sha1_info(p->one);
2534 diff_fill_sha1_info(p->two);
2535
2536 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2537 }
2538
2539 void diff_setup(struct diff_options *options)
2540 {
2541 memset(options, 0, sizeof(*options));
2542
2543 options->file = stdout;
2544
2545 options->line_termination = '\n';
2546 options->break_opt = -1;
2547 options->rename_limit = -1;
2548 options->dirstat_percent = 3;
2549 options->context = 3;
2550
2551 options->change = diff_change;
2552 options->add_remove = diff_addremove;
2553 if (diff_use_color_default > 0)
2554 DIFF_OPT_SET(options, COLOR_DIFF);
2555 options->detect_rename = diff_detect_rename_default;
2556
2557 if (!diff_mnemonic_prefix) {
2558 options->a_prefix = "a/";
2559 options->b_prefix = "b/";
2560 }
2561 }
2562
2563 int diff_setup_done(struct diff_options *options)
2564 {
2565 int count = 0;
2566
2567 if (options->output_format & DIFF_FORMAT_NAME)
2568 count++;
2569 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2570 count++;
2571 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2572 count++;
2573 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2574 count++;
2575 if (count > 1)
2576 die("--name-only, --name-status, --check and -s are mutually exclusive");
2577
2578 /*
2579 * Most of the time we can say "there are changes"
2580 * only by checking if there are changed paths, but
2581 * --ignore-whitespace* options force us to look
2582 * inside contents.
2583 */
2584
2585 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
2586 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
2587 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
2588 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
2589 else
2590 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
2591
2592 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2593 options->detect_rename = DIFF_DETECT_COPY;
2594
2595 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2596 options->prefix = NULL;
2597 if (options->prefix)
2598 options->prefix_length = strlen(options->prefix);
2599 else
2600 options->prefix_length = 0;
2601
2602 if (options->output_format & (DIFF_FORMAT_NAME |
2603 DIFF_FORMAT_NAME_STATUS |
2604 DIFF_FORMAT_CHECKDIFF |
2605 DIFF_FORMAT_NO_OUTPUT))
2606 options->output_format &= ~(DIFF_FORMAT_RAW |
2607 DIFF_FORMAT_NUMSTAT |
2608 DIFF_FORMAT_DIFFSTAT |
2609 DIFF_FORMAT_SHORTSTAT |
2610 DIFF_FORMAT_DIRSTAT |
2611 DIFF_FORMAT_SUMMARY |
2612 DIFF_FORMAT_PATCH);
2613
2614 /*
2615 * These cases always need recursive; we do not drop caller-supplied
2616 * recursive bits for other formats here.
2617 */
2618 if (options->output_format & (DIFF_FORMAT_PATCH |
2619 DIFF_FORMAT_NUMSTAT |
2620 DIFF_FORMAT_DIFFSTAT |
2621 DIFF_FORMAT_SHORTSTAT |
2622 DIFF_FORMAT_DIRSTAT |
2623 DIFF_FORMAT_SUMMARY |
2624 DIFF_FORMAT_CHECKDIFF))
2625 DIFF_OPT_SET(options, RECURSIVE);
2626 /*
2627 * Also pickaxe would not work very well if you do not say recursive
2628 */
2629 if (options->pickaxe)
2630 DIFF_OPT_SET(options, RECURSIVE);
2631
2632 if (options->detect_rename && options->rename_limit < 0)
2633 options->rename_limit = diff_rename_limit_default;
2634 if (options->setup & DIFF_SETUP_USE_CACHE) {
2635 if (!active_cache)
2636 /* read-cache does not die even when it fails
2637 * so it is safe for us to do this here. Also
2638 * it does not smudge active_cache or active_nr
2639 * when it fails, so we do not have to worry about
2640 * cleaning it up ourselves either.
2641 */
2642 read_cache();
2643 }
2644 if (options->abbrev <= 0 || 40 < options->abbrev)
2645 options->abbrev = 40; /* full */
2646
2647 /*
2648 * It does not make sense to show the first hit we happened
2649 * to have found. It does not make sense not to return with
2650 * exit code in such a case either.
2651 */
2652 if (DIFF_OPT_TST(options, QUICK)) {
2653 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2654 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2655 }
2656
2657 return 0;
2658 }
2659
2660 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2661 {
2662 char c, *eq;
2663 int len;
2664
2665 if (*arg != '-')
2666 return 0;
2667 c = *++arg;
2668 if (!c)
2669 return 0;
2670 if (c == arg_short) {
2671 c = *++arg;
2672 if (!c)
2673 return 1;
2674 if (val && isdigit(c)) {
2675 char *end;
2676 int n = strtoul(arg, &end, 10);
2677 if (*end)
2678 return 0;
2679 *val = n;
2680 return 1;
2681 }
2682 return 0;
2683 }
2684 if (c != '-')
2685 return 0;
2686 arg++;
2687 eq = strchr(arg, '=');
2688 if (eq)
2689 len = eq - arg;
2690 else
2691 len = strlen(arg);
2692 if (!len || strncmp(arg, arg_long, len))
2693 return 0;
2694 if (eq) {
2695 int n;
2696 char *end;
2697 if (!isdigit(*++eq))
2698 return 0;
2699 n = strtoul(eq, &end, 10);
2700 if (*end)
2701 return 0;
2702 *val = n;
2703 }
2704 return 1;
2705 }
2706
2707 static int diff_scoreopt_parse(const char *opt);
2708
2709 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2710 {
2711 const char *arg = av[0];
2712
2713 /* Output format options */
2714 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2715 options->output_format |= DIFF_FORMAT_PATCH;
2716 else if (opt_arg(arg, 'U', "unified", &options->context))
2717 options->output_format |= DIFF_FORMAT_PATCH;
2718 else if (!strcmp(arg, "--raw"))
2719 options->output_format |= DIFF_FORMAT_RAW;
2720 else if (!strcmp(arg, "--patch-with-raw"))
2721 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2722 else if (!strcmp(arg, "--numstat"))
2723 options->output_format |= DIFF_FORMAT_NUMSTAT;
2724 else if (!strcmp(arg, "--shortstat"))
2725 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2726 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2727 options->output_format |= DIFF_FORMAT_DIRSTAT;
2728 else if (!strcmp(arg, "--cumulative")) {
2729 options->output_format |= DIFF_FORMAT_DIRSTAT;
2730 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
2731 } else if (opt_arg(arg, 0, "dirstat-by-file",
2732 &options->dirstat_percent)) {
2733 options->output_format |= DIFF_FORMAT_DIRSTAT;
2734 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
2735 }
2736 else if (!strcmp(arg, "--check"))
2737 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2738 else if (!strcmp(arg, "--summary"))
2739 options->output_format |= DIFF_FORMAT_SUMMARY;
2740 else if (!strcmp(arg, "--patch-with-stat"))
2741 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2742 else if (!strcmp(arg, "--name-only"))
2743 options->output_format |= DIFF_FORMAT_NAME;
2744 else if (!strcmp(arg, "--name-status"))
2745 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2746 else if (!strcmp(arg, "-s"))
2747 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2748 else if (!prefixcmp(arg, "--stat")) {
2749 char *end;
2750 int width = options->stat_width;
2751 int name_width = options->stat_name_width;
2752 arg += 6;
2753 end = (char *)arg;
2754
2755 switch (*arg) {
2756 case '-':
2757 if (!prefixcmp(arg, "-width="))
2758 width = strtoul(arg + 7, &end, 10);
2759 else if (!prefixcmp(arg, "-name-width="))
2760 name_width = strtoul(arg + 12, &end, 10);
2761 break;
2762 case '=':
2763 width = strtoul(arg+1, &end, 10);
2764 if (*end == ',')
2765 name_width = strtoul(end+1, &end, 10);
2766 }
2767
2768 /* Important! This checks all the error cases! */
2769 if (*end)
2770 return 0;
2771 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2772 options->stat_name_width = name_width;
2773 options->stat_width = width;
2774 }
2775
2776 /* renames options */
2777 else if (!prefixcmp(arg, "-B")) {
2778 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2779 return -1;
2780 }
2781 else if (!prefixcmp(arg, "-M")) {
2782 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2783 return -1;
2784 options->detect_rename = DIFF_DETECT_RENAME;
2785 }
2786 else if (!prefixcmp(arg, "-C")) {
2787 if (options->detect_rename == DIFF_DETECT_COPY)
2788 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2789 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2790 return -1;
2791 options->detect_rename = DIFF_DETECT_COPY;
2792 }
2793 else if (!strcmp(arg, "--no-renames"))
2794 options->detect_rename = 0;
2795 else if (!strcmp(arg, "--relative"))
2796 DIFF_OPT_SET(options, RELATIVE_NAME);
2797 else if (!prefixcmp(arg, "--relative=")) {
2798 DIFF_OPT_SET(options, RELATIVE_NAME);
2799 options->prefix = arg + 11;
2800 }
2801
2802 /* xdiff options */
2803 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2804 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
2805 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2806 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
2807 else if (!strcmp(arg, "--ignore-space-at-eol"))
2808 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
2809 else if (!strcmp(arg, "--patience"))
2810 DIFF_XDL_SET(options, PATIENCE_DIFF);
2811
2812 /* flags options */
2813 else if (!strcmp(arg, "--binary")) {
2814 options->output_format |= DIFF_FORMAT_PATCH;
2815 DIFF_OPT_SET(options, BINARY);
2816 }
2817 else if (!strcmp(arg, "--full-index"))
2818 DIFF_OPT_SET(options, FULL_INDEX);
2819 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2820 DIFF_OPT_SET(options, TEXT);
2821 else if (!strcmp(arg, "-R"))
2822 DIFF_OPT_SET(options, REVERSE_DIFF);
2823 else if (!strcmp(arg, "--find-copies-harder"))
2824 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2825 else if (!strcmp(arg, "--follow"))
2826 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2827 else if (!strcmp(arg, "--color"))
2828 DIFF_OPT_SET(options, COLOR_DIFF);
2829 else if (!strcmp(arg, "--no-color"))
2830 DIFF_OPT_CLR(options, COLOR_DIFF);
2831 else if (!strcmp(arg, "--color-words")) {
2832 DIFF_OPT_SET(options, COLOR_DIFF);
2833 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2834 }
2835 else if (!prefixcmp(arg, "--color-words=")) {
2836 DIFF_OPT_SET(options, COLOR_DIFF);
2837 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2838 options->word_regex = arg + 14;
2839 }
2840 else if (!strcmp(arg, "--exit-code"))
2841 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2842 else if (!strcmp(arg, "--quiet"))
2843 DIFF_OPT_SET(options, QUICK);
2844 else if (!strcmp(arg, "--ext-diff"))
2845 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2846 else if (!strcmp(arg, "--no-ext-diff"))
2847 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2848 else if (!strcmp(arg, "--textconv"))
2849 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
2850 else if (!strcmp(arg, "--no-textconv"))
2851 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
2852 else if (!strcmp(arg, "--ignore-submodules"))
2853 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2854 else if (!strcmp(arg, "--submodule"))
2855 DIFF_OPT_SET(options, SUBMODULE_LOG);
2856 else if (!prefixcmp(arg, "--submodule=")) {
2857 if (!strcmp(arg + 12, "log"))
2858 DIFF_OPT_SET(options, SUBMODULE_LOG);
2859 }
2860
2861 /* misc options */
2862 else if (!strcmp(arg, "-z"))
2863 options->line_termination = 0;
2864 else if (!prefixcmp(arg, "-l"))
2865 options->rename_limit = strtoul(arg+2, NULL, 10);
2866 else if (!prefixcmp(arg, "-S"))
2867 options->pickaxe = arg + 2;
2868 else if (!strcmp(arg, "--pickaxe-all"))
2869 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2870 else if (!strcmp(arg, "--pickaxe-regex"))
2871 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2872 else if (!prefixcmp(arg, "-O"))
2873 options->orderfile = arg + 2;
2874 else if (!prefixcmp(arg, "--diff-filter="))
2875 options->filter = arg + 14;
2876 else if (!strcmp(arg, "--abbrev"))
2877 options->abbrev = DEFAULT_ABBREV;
2878 else if (!prefixcmp(arg, "--abbrev=")) {
2879 options->abbrev = strtoul(arg + 9, NULL, 10);
2880 if (options->abbrev < MINIMUM_ABBREV)
2881 options->abbrev = MINIMUM_ABBREV;
2882 else if (40 < options->abbrev)
2883 options->abbrev = 40;
2884 }
2885 else if (!prefixcmp(arg, "--src-prefix="))
2886 options->a_prefix = arg + 13;
2887 else if (!prefixcmp(arg, "--dst-prefix="))
2888 options->b_prefix = arg + 13;
2889 else if (!strcmp(arg, "--no-prefix"))
2890 options->a_prefix = options->b_prefix = "";
2891 else if (opt_arg(arg, '\0', "inter-hunk-context",
2892 &options->interhunkcontext))
2893 ;
2894 else if (!prefixcmp(arg, "--output=")) {
2895 options->file = fopen(arg + strlen("--output="), "w");
2896 options->close_file = 1;
2897 } else
2898 return 0;
2899 return 1;
2900 }
2901
2902 static int parse_num(const char **cp_p)
2903 {
2904 unsigned long num, scale;
2905 int ch, dot;
2906 const char *cp = *cp_p;
2907
2908 num = 0;
2909 scale = 1;
2910 dot = 0;
2911 for (;;) {
2912 ch = *cp;
2913 if ( !dot && ch == '.' ) {
2914 scale = 1;
2915 dot = 1;
2916 } else if ( ch == '%' ) {
2917 scale = dot ? scale*100 : 100;
2918 cp++; /* % is always at the end */
2919 break;
2920 } else if ( ch >= '0' && ch <= '9' ) {
2921 if ( scale < 100000 ) {
2922 scale *= 10;
2923 num = (num*10) + (ch-'0');
2924 }
2925 } else {
2926 break;
2927 }
2928 cp++;
2929 }
2930 *cp_p = cp;
2931
2932 /* user says num divided by scale and we say internally that
2933 * is MAX_SCORE * num / scale.
2934 */
2935 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2936 }
2937
2938 static int diff_scoreopt_parse(const char *opt)
2939 {
2940 int opt1, opt2, cmd;
2941
2942 if (*opt++ != '-')
2943 return -1;
2944 cmd = *opt++;
2945 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2946 return -1; /* that is not a -M, -C nor -B option */
2947
2948 opt1 = parse_num(&opt);
2949 if (cmd != 'B')
2950 opt2 = 0;
2951 else {
2952 if (*opt == 0)
2953 opt2 = 0;
2954 else if (*opt != '/')
2955 return -1; /* we expect -B80/99 or -B80 */
2956 else {
2957 opt++;
2958 opt2 = parse_num(&opt);
2959 }
2960 }
2961 if (*opt != 0)
2962 return -1;
2963 return opt1 | (opt2 << 16);
2964 }
2965
2966 struct diff_queue_struct diff_queued_diff;
2967
2968 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2969 {
2970 if (queue->alloc <= queue->nr) {
2971 queue->alloc = alloc_nr(queue->alloc);
2972 queue->queue = xrealloc(queue->queue,
2973 sizeof(dp) * queue->alloc);
2974 }
2975 queue->queue[queue->nr++] = dp;
2976 }
2977
2978 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2979 struct diff_filespec *one,
2980 struct diff_filespec *two)
2981 {
2982 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2983 dp->one = one;
2984 dp->two = two;
2985 if (queue)
2986 diff_q(queue, dp);
2987 return dp;
2988 }
2989
2990 void diff_free_filepair(struct diff_filepair *p)
2991 {
2992 free_filespec(p->one);
2993 free_filespec(p->two);
2994 free(p);
2995 }
2996
2997 /* This is different from find_unique_abbrev() in that
2998 * it stuffs the result with dots for alignment.
2999 */
3000 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3001 {
3002 int abblen;
3003 const char *abbrev;
3004 if (len == 40)
3005 return sha1_to_hex(sha1);
3006
3007 abbrev = find_unique_abbrev(sha1, len);
3008 abblen = strlen(abbrev);
3009 if (abblen < 37) {
3010 static char hex[41];
3011 if (len < abblen && abblen <= len + 2)
3012 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3013 else
3014 sprintf(hex, "%s...", abbrev);
3015 return hex;
3016 }
3017 return sha1_to_hex(sha1);
3018 }
3019
3020 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3021 {
3022 int line_termination = opt->line_termination;
3023 int inter_name_termination = line_termination ? '\t' : '\0';
3024
3025 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3026 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3027 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3028 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3029 }
3030 if (p->score) {
3031 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3032 inter_name_termination);
3033 } else {
3034 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3035 }
3036
3037 if (p->status == DIFF_STATUS_COPIED ||
3038 p->status == DIFF_STATUS_RENAMED) {
3039 const char *name_a, *name_b;
3040 name_a = p->one->path;
3041 name_b = p->two->path;
3042 strip_prefix(opt->prefix_length, &name_a, &name_b);
3043 write_name_quoted(name_a, opt->file, inter_name_termination);
3044 write_name_quoted(name_b, opt->file, line_termination);
3045 } else {
3046 const char *name_a, *name_b;
3047 name_a = p->one->mode ? p->one->path : p->two->path;
3048 name_b = NULL;
3049 strip_prefix(opt->prefix_length, &name_a, &name_b);
3050 write_name_quoted(name_a, opt->file, line_termination);
3051 }
3052 }
3053
3054 int diff_unmodified_pair(struct diff_filepair *p)
3055 {
3056 /* This function is written stricter than necessary to support
3057 * the currently implemented transformers, but the idea is to
3058 * let transformers to produce diff_filepairs any way they want,
3059 * and filter and clean them up here before producing the output.
3060 */
3061 struct diff_filespec *one = p->one, *two = p->two;
3062
3063 if (DIFF_PAIR_UNMERGED(p))
3064 return 0; /* unmerged is interesting */
3065
3066 /* deletion, addition, mode or type change
3067 * and rename are all interesting.
3068 */
3069 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3070 DIFF_PAIR_MODE_CHANGED(p) ||
3071 strcmp(one->path, two->path))
3072 return 0;
3073
3074 /* both are valid and point at the same path. that is, we are
3075 * dealing with a change.
3076 */
3077 if (one->sha1_valid && two->sha1_valid &&
3078 !hashcmp(one->sha1, two->sha1))
3079 return 1; /* no change */
3080 if (!one->sha1_valid && !two->sha1_valid)
3081 return 1; /* both look at the same file on the filesystem. */
3082 return 0;
3083 }
3084
3085 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3086 {
3087 if (diff_unmodified_pair(p))
3088 return;
3089
3090 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3091 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3092 return; /* no tree diffs in patch format */
3093
3094 run_diff(p, o);
3095 }
3096
3097 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3098 struct diffstat_t *diffstat)
3099 {
3100 if (diff_unmodified_pair(p))
3101 return;
3102
3103 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3104 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3105 return; /* no tree diffs in patch format */
3106
3107 run_diffstat(p, o, diffstat);
3108 }
3109
3110 static void diff_flush_checkdiff(struct diff_filepair *p,
3111 struct diff_options *o)
3112 {
3113 if (diff_unmodified_pair(p))
3114 return;
3115
3116 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3117 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3118 return; /* no tree diffs in patch format */
3119
3120 run_checkdiff(p, o);
3121 }
3122
3123 int diff_queue_is_empty(void)
3124 {
3125 struct diff_queue_struct *q = &diff_queued_diff;
3126 int i;
3127 for (i = 0; i < q->nr; i++)
3128 if (!diff_unmodified_pair(q->queue[i]))
3129 return 0;
3130 return 1;
3131 }
3132
3133 #if DIFF_DEBUG
3134 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3135 {
3136 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3137 x, one ? one : "",
3138 s->path,
3139 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3140 s->mode,
3141 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3142 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3143 x, one ? one : "",
3144 s->size, s->xfrm_flags);
3145 }
3146
3147 void diff_debug_filepair(const struct diff_filepair *p, int i)
3148 {
3149 diff_debug_filespec(p->one, i, "one");
3150 diff_debug_filespec(p->two, i, "two");
3151 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3152 p->score, p->status ? p->status : '?',
3153 p->one->rename_used, p->broken_pair);
3154 }
3155
3156 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3157 {
3158 int i;
3159 if (msg)
3160 fprintf(stderr, "%s\n", msg);
3161 fprintf(stderr, "q->nr = %d\n", q->nr);
3162 for (i = 0; i < q->nr; i++) {
3163 struct diff_filepair *p = q->queue[i];
3164 diff_debug_filepair(p, i);
3165 }
3166 }
3167 #endif
3168
3169 static void diff_resolve_rename_copy(void)
3170 {
3171 int i;
3172 struct diff_filepair *p;
3173 struct diff_queue_struct *q = &diff_queued_diff;
3174
3175 diff_debug_queue("resolve-rename-copy", q);
3176
3177 for (i = 0; i < q->nr; i++) {
3178 p = q->queue[i];
3179 p->status = 0; /* undecided */
3180 if (DIFF_PAIR_UNMERGED(p))
3181 p->status = DIFF_STATUS_UNMERGED;
3182 else if (!DIFF_FILE_VALID(p->one))
3183 p->status = DIFF_STATUS_ADDED;
3184 else if (!DIFF_FILE_VALID(p->two))
3185 p->status = DIFF_STATUS_DELETED;
3186 else if (DIFF_PAIR_TYPE_CHANGED(p))
3187 p->status = DIFF_STATUS_TYPE_CHANGED;
3188
3189 /* from this point on, we are dealing with a pair
3190 * whose both sides are valid and of the same type, i.e.
3191 * either in-place edit or rename/copy edit.
3192 */
3193 else if (DIFF_PAIR_RENAME(p)) {
3194 /*
3195 * A rename might have re-connected a broken
3196 * pair up, causing the pathnames to be the
3197 * same again. If so, that's not a rename at
3198 * all, just a modification..
3199 *
3200 * Otherwise, see if this source was used for
3201 * multiple renames, in which case we decrement
3202 * the count, and call it a copy.
3203 */
3204 if (!strcmp(p->one->path, p->two->path))
3205 p->status = DIFF_STATUS_MODIFIED;
3206 else if (--p->one->rename_used > 0)
3207 p->status = DIFF_STATUS_COPIED;
3208 else
3209 p->status = DIFF_STATUS_RENAMED;
3210 }
3211 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3212 p->one->mode != p->two->mode ||
3213 is_null_sha1(p->one->sha1))
3214 p->status = DIFF_STATUS_MODIFIED;
3215 else {
3216 /* This is a "no-change" entry and should not
3217 * happen anymore, but prepare for broken callers.
3218 */
3219 error("feeding unmodified %s to diffcore",
3220 p->one->path);
3221 p->status = DIFF_STATUS_UNKNOWN;
3222 }
3223 }
3224 diff_debug_queue("resolve-rename-copy done", q);
3225 }
3226
3227 static int check_pair_status(struct diff_filepair *p)
3228 {
3229 switch (p->status) {
3230 case DIFF_STATUS_UNKNOWN:
3231 return 0;
3232 case 0:
3233 die("internal error in diff-resolve-rename-copy");
3234 default:
3235 return 1;
3236 }
3237 }
3238
3239 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3240 {
3241 int fmt = opt->output_format;
3242
3243 if (fmt & DIFF_FORMAT_CHECKDIFF)
3244 diff_flush_checkdiff(p, opt);
3245 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3246 diff_flush_raw(p, opt);
3247 else if (fmt & DIFF_FORMAT_NAME) {
3248 const char *name_a, *name_b;
3249 name_a = p->two->path;
3250 name_b = NULL;
3251 strip_prefix(opt->prefix_length, &name_a, &name_b);
3252 write_name_quoted(name_a, opt->file, opt->line_termination);
3253 }
3254 }
3255
3256 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3257 {
3258 if (fs->mode)
3259 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3260 else
3261 fprintf(file, " %s ", newdelete);
3262 write_name_quoted(fs->path, file, '\n');
3263 }
3264
3265
3266 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
3267 {
3268 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3269 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
3270 show_name ? ' ' : '\n');
3271 if (show_name) {
3272 write_name_quoted(p->two->path, file, '\n');
3273 }
3274 }
3275 }
3276
3277 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
3278 {
3279 char *names = pprint_rename(p->one->path, p->two->path);
3280
3281 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3282 free(names);
3283 show_mode_change(file, p, 0);
3284 }
3285
3286 static void diff_summary(FILE *file, struct diff_filepair *p)
3287 {
3288 switch(p->status) {
3289 case DIFF_STATUS_DELETED:
3290 show_file_mode_name(file, "delete", p->one);
3291 break;
3292 case DIFF_STATUS_ADDED:
3293 show_file_mode_name(file, "create", p->two);
3294 break;
3295 case DIFF_STATUS_COPIED:
3296 show_rename_copy(file, "copy", p);
3297 break;
3298 case DIFF_STATUS_RENAMED:
3299 show_rename_copy(file, "rename", p);
3300 break;
3301 default:
3302 if (p->score) {
3303 fputs(" rewrite ", file);
3304 write_name_quoted(p->two->path, file, ' ');
3305 fprintf(file, "(%d%%)\n", similarity_index(p));
3306 }
3307 show_mode_change(file, p, !p->score);
3308 break;
3309 }
3310 }
3311
3312 struct patch_id_t {
3313 git_SHA_CTX *ctx;
3314 int patchlen;
3315 };
3316
3317 static int remove_space(char *line, int len)
3318 {
3319 int i;
3320 char *dst = line;
3321 unsigned char c;
3322
3323 for (i = 0; i < len; i++)
3324 if (!isspace((c = line[i])))
3325 *dst++ = c;
3326
3327 return dst - line;
3328 }
3329
3330 static void patch_id_consume(void *priv, char *line, unsigned long len)
3331 {
3332 struct patch_id_t *data = priv;
3333 int new_len;
3334
3335 /* Ignore line numbers when computing the SHA1 of the patch */
3336 if (!prefixcmp(line, "@@ -"))
3337 return;
3338
3339 new_len = remove_space(line, len);
3340
3341 git_SHA1_Update(data->ctx, line, new_len);
3342 data->patchlen += new_len;
3343 }
3344
3345 /* returns 0 upon success, and writes result into sha1 */
3346 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3347 {
3348 struct diff_queue_struct *q = &diff_queued_diff;
3349 int i;
3350 git_SHA_CTX ctx;
3351 struct patch_id_t data;
3352 char buffer[PATH_MAX * 4 + 20];
3353
3354 git_SHA1_Init(&ctx);
3355 memset(&data, 0, sizeof(struct patch_id_t));
3356 data.ctx = &ctx;
3357
3358 for (i = 0; i < q->nr; i++) {
3359 xpparam_t xpp;
3360 xdemitconf_t xecfg;
3361 xdemitcb_t ecb;
3362 mmfile_t mf1, mf2;
3363 struct diff_filepair *p = q->queue[i];
3364 int len1, len2;
3365
3366 memset(&xpp, 0, sizeof(xpp));
3367 memset(&xecfg, 0, sizeof(xecfg));
3368 if (p->status == 0)
3369 return error("internal diff status error");
3370 if (p->status == DIFF_STATUS_UNKNOWN)
3371 continue;
3372 if (diff_unmodified_pair(p))
3373 continue;
3374 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3375 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3376 continue;
3377 if (DIFF_PAIR_UNMERGED(p))
3378 continue;
3379
3380 diff_fill_sha1_info(p->one);
3381 diff_fill_sha1_info(p->two);
3382 if (fill_mmfile(&mf1, p->one) < 0 ||
3383 fill_mmfile(&mf2, p->two) < 0)
3384 return error("unable to read files to diff");
3385
3386 len1 = remove_space(p->one->path, strlen(p->one->path));
3387 len2 = remove_space(p->two->path, strlen(p->two->path));
3388 if (p->one->mode == 0)
3389 len1 = snprintf(buffer, sizeof(buffer),
3390 "diff--gita/%.*sb/%.*s"
3391 "newfilemode%06o"
3392 "---/dev/null"
3393 "+++b/%.*s",
3394 len1, p->one->path,
3395 len2, p->two->path,
3396 p->two->mode,
3397 len2, p->two->path);
3398 else if (p->two->mode == 0)
3399 len1 = snprintf(buffer, sizeof(buffer),
3400 "diff--gita/%.*sb/%.*s"
3401 "deletedfilemode%06o"
3402 "---a/%.*s"
3403 "+++/dev/null",
3404 len1, p->one->path,
3405 len2, p->two->path,
3406 p->one->mode,
3407 len1, p->one->path);
3408 else
3409 len1 = snprintf(buffer, sizeof(buffer),
3410 "diff--gita/%.*sb/%.*s"
3411 "---a/%.*s"
3412 "+++b/%.*s",
3413 len1, p->one->path,
3414 len2, p->two->path,
3415 len1, p->one->path,
3416 len2, p->two->path);
3417 git_SHA1_Update(&ctx, buffer, len1);
3418
3419 xpp.flags = XDF_NEED_MINIMAL;
3420 xecfg.ctxlen = 3;
3421 xecfg.flags = XDL_EMIT_FUNCNAMES;
3422 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3423 &xpp, &xecfg, &ecb);
3424 }
3425
3426 git_SHA1_Final(sha1, &ctx);
3427 return 0;
3428 }
3429
3430 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3431 {
3432 struct diff_queue_struct *q = &diff_queued_diff;
3433 int i;
3434 int result = diff_get_patch_id(options, sha1);
3435
3436 for (i = 0; i < q->nr; i++)
3437 diff_free_filepair(q->queue[i]);
3438
3439 free(q->queue);
3440 q->queue = NULL;
3441 q->nr = q->alloc = 0;
3442
3443 return result;
3444 }
3445
3446 static int is_summary_empty(const struct diff_queue_struct *q)
3447 {
3448 int i;
3449
3450 for (i = 0; i < q->nr; i++) {
3451 const struct diff_filepair *p = q->queue[i];
3452
3453 switch (p->status) {
3454 case DIFF_STATUS_DELETED:
3455 case DIFF_STATUS_ADDED:
3456 case DIFF_STATUS_COPIED:
3457 case DIFF_STATUS_RENAMED:
3458 return 0;
3459 default:
3460 if (p->score)
3461 return 0;
3462 if (p->one->mode && p->two->mode &&
3463 p->one->mode != p->two->mode)
3464 return 0;
3465 break;
3466 }
3467 }
3468 return 1;
3469 }
3470
3471 void diff_flush(struct diff_options *options)
3472 {
3473 struct diff_queue_struct *q = &diff_queued_diff;
3474 int i, output_format = options->output_format;
3475 int separator = 0;
3476
3477 /*
3478 * Order: raw, stat, summary, patch
3479 * or: name/name-status/checkdiff (other bits clear)
3480 */
3481 if (!q->nr)
3482 goto free_queue;
3483
3484 if (output_format & (DIFF_FORMAT_RAW |
3485 DIFF_FORMAT_NAME |
3486 DIFF_FORMAT_NAME_STATUS |
3487 DIFF_FORMAT_CHECKDIFF)) {
3488 for (i = 0; i < q->nr; i++) {
3489 struct diff_filepair *p = q->queue[i];
3490 if (check_pair_status(p))
3491 flush_one_pair(p, options);
3492 }
3493 separator++;
3494 }
3495
3496 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3497 struct diffstat_t diffstat;
3498
3499 memset(&diffstat, 0, sizeof(struct diffstat_t));
3500 for (i = 0; i < q->nr; i++) {
3501 struct diff_filepair *p = q->queue[i];
3502 if (check_pair_status(p))
3503 diff_flush_stat(p, options, &diffstat);
3504 }
3505 if (output_format & DIFF_FORMAT_NUMSTAT)
3506 show_numstat(&diffstat, options);
3507 if (output_format & DIFF_FORMAT_DIFFSTAT)
3508 show_stats(&diffstat, options);
3509 if (output_format & DIFF_FORMAT_SHORTSTAT)
3510 show_shortstats(&diffstat, options);
3511 free_diffstat_info(&diffstat);
3512 separator++;
3513 }
3514 if (output_format & DIFF_FORMAT_DIRSTAT)
3515 show_dirstat(options);
3516
3517 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3518 for (i = 0; i < q->nr; i++)
3519 diff_summary(options->file, q->queue[i]);
3520 separator++;
3521 }
3522
3523 if (output_format & DIFF_FORMAT_PATCH) {
3524 if (separator) {
3525 putc(options->line_termination, options->file);
3526 if (options->stat_sep) {
3527 /* attach patch instead of inline */
3528 fputs(options->stat_sep, options->file);
3529 }
3530 }
3531
3532 for (i = 0; i < q->nr; i++) {
3533 struct diff_filepair *p = q->queue[i];
3534 if (check_pair_status(p))
3535 diff_flush_patch(p, options);
3536 }
3537 }
3538
3539 if (output_format & DIFF_FORMAT_CALLBACK)
3540 options->format_callback(q, options, options->format_callback_data);
3541
3542 for (i = 0; i < q->nr; i++)
3543 diff_free_filepair(q->queue[i]);
3544 free_queue:
3545 free(q->queue);
3546 q->queue = NULL;
3547 q->nr = q->alloc = 0;
3548 if (options->close_file)
3549 fclose(options->file);
3550
3551 /*
3552 * Report the content-level differences with HAS_CHANGES;
3553 * diff_addremove/diff_change does not set the bit when
3554 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
3555 */
3556 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
3557 if (options->found_changes)
3558 DIFF_OPT_SET(options, HAS_CHANGES);
3559 else
3560 DIFF_OPT_CLR(options, HAS_CHANGES);
3561 }
3562 }
3563
3564 static void diffcore_apply_filter(const char *filter)
3565 {
3566 int i;
3567 struct diff_queue_struct *q = &diff_queued_diff;
3568 struct diff_queue_struct outq;
3569 outq.queue = NULL;
3570 outq.nr = outq.alloc = 0;
3571
3572 if (!filter)
3573 return;
3574
3575 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3576 int found;
3577 for (i = found = 0; !found && i < q->nr; i++) {
3578 struct diff_filepair *p = q->queue[i];
3579 if (((p->status == DIFF_STATUS_MODIFIED) &&
3580 ((p->score &&
3581 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3582 (!p->score &&
3583 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3584 ((p->status != DIFF_STATUS_MODIFIED) &&
3585 strchr(filter, p->status)))
3586 found++;
3587 }
3588 if (found)
3589 return;
3590
3591 /* otherwise we will clear the whole queue
3592 * by copying the empty outq at the end of this
3593 * function, but first clear the current entries
3594 * in the queue.
3595 */
3596 for (i = 0; i < q->nr; i++)
3597 diff_free_filepair(q->queue[i]);
3598 }
3599 else {
3600 /* Only the matching ones */
3601 for (i = 0; i < q->nr; i++) {
3602 struct diff_filepair *p = q->queue[i];
3603
3604 if (((p->status == DIFF_STATUS_MODIFIED) &&
3605 ((p->score &&
3606 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3607 (!p->score &&
3608 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3609 ((p->status != DIFF_STATUS_MODIFIED) &&
3610 strchr(filter, p->status)))
3611 diff_q(&outq, p);
3612 else
3613 diff_free_filepair(p);
3614 }
3615 }
3616 free(q->queue);
3617 *q = outq;
3618 }
3619
3620 /* Check whether two filespecs with the same mode and size are identical */
3621 static int diff_filespec_is_identical(struct diff_filespec *one,
3622 struct diff_filespec *two)
3623 {
3624 if (S_ISGITLINK(one->mode))
3625 return 0;
3626 if (diff_populate_filespec(one, 0))
3627 return 0;
3628 if (diff_populate_filespec(two, 0))
3629 return 0;
3630 return !memcmp(one->data, two->data, one->size);
3631 }
3632
3633 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3634 {
3635 int i;
3636 struct diff_queue_struct *q = &diff_queued_diff;
3637 struct diff_queue_struct outq;
3638 outq.queue = NULL;
3639 outq.nr = outq.alloc = 0;
3640
3641 for (i = 0; i < q->nr; i++) {
3642 struct diff_filepair *p = q->queue[i];
3643
3644 /*
3645 * 1. Entries that come from stat info dirtyness
3646 * always have both sides (iow, not create/delete),
3647 * one side of the object name is unknown, with
3648 * the same mode and size. Keep the ones that
3649 * do not match these criteria. They have real
3650 * differences.
3651 *
3652 * 2. At this point, the file is known to be modified,
3653 * with the same mode and size, and the object
3654 * name of one side is unknown. Need to inspect
3655 * the identical contents.
3656 */
3657 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3658 !DIFF_FILE_VALID(p->two) ||
3659 (p->one->sha1_valid && p->two->sha1_valid) ||
3660 (p->one->mode != p->two->mode) ||
3661 diff_populate_filespec(p->one, 1) ||
3662 diff_populate_filespec(p->two, 1) ||
3663 (p->one->size != p->two->size) ||
3664 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3665 diff_q(&outq, p);
3666 else {
3667 /*
3668 * The caller can subtract 1 from skip_stat_unmatch
3669 * to determine how many paths were dirty only
3670 * due to stat info mismatch.
3671 */
3672 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3673 diffopt->skip_stat_unmatch++;
3674 diff_free_filepair(p);
3675 }
3676 }
3677 free(q->queue);
3678 *q = outq;
3679 }
3680
3681 static int diffnamecmp(const void *a_, const void *b_)
3682 {
3683 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
3684 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
3685 const char *name_a, *name_b;
3686
3687 name_a = a->one ? a->one->path : a->two->path;
3688 name_b = b->one ? b->one->path : b->two->path;
3689 return strcmp(name_a, name_b);
3690 }
3691
3692 void diffcore_fix_diff_index(struct diff_options *options)
3693 {
3694 struct diff_queue_struct *q = &diff_queued_diff;
3695 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
3696 }
3697
3698 void diffcore_std(struct diff_options *options)
3699 {
3700 if (options->skip_stat_unmatch)
3701 diffcore_skip_stat_unmatch(options);
3702 if (options->break_opt != -1)
3703 diffcore_break(options->break_opt);
3704 if (options->detect_rename)
3705 diffcore_rename(options);
3706 if (options->break_opt != -1)
3707 diffcore_merge_broken();
3708 if (options->pickaxe)
3709 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3710 if (options->orderfile)
3711 diffcore_order(options->orderfile);
3712 diff_resolve_rename_copy();
3713 diffcore_apply_filter(options->filter);
3714
3715 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
3716 DIFF_OPT_SET(options, HAS_CHANGES);
3717 else
3718 DIFF_OPT_CLR(options, HAS_CHANGES);
3719 }
3720
3721 int diff_result_code(struct diff_options *opt, int status)
3722 {
3723 int result = 0;
3724 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3725 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3726 return status;
3727 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3728 DIFF_OPT_TST(opt, HAS_CHANGES))
3729 result |= 01;
3730 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3731 DIFF_OPT_TST(opt, CHECK_FAILED))
3732 result |= 02;
3733 return result;
3734 }
3735
3736 void diff_addremove(struct diff_options *options,
3737 int addremove, unsigned mode,
3738 const unsigned char *sha1,
3739 const char *concatpath, unsigned dirty_submodule)
3740 {
3741 struct diff_filespec *one, *two;
3742
3743 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3744 return;
3745
3746 /* This may look odd, but it is a preparation for
3747 * feeding "there are unchanged files which should
3748 * not produce diffs, but when you are doing copy
3749 * detection you would need them, so here they are"
3750 * entries to the diff-core. They will be prefixed
3751 * with something like '=' or '*' (I haven't decided
3752 * which but should not make any difference).
3753 * Feeding the same new and old to diff_change()
3754 * also has the same effect.
3755 * Before the final output happens, they are pruned after
3756 * merged into rename/copy pairs as appropriate.
3757 */
3758 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3759 addremove = (addremove == '+' ? '-' :
3760 addremove == '-' ? '+' : addremove);
3761
3762 if (options->prefix &&
3763 strncmp(concatpath, options->prefix, options->prefix_length))
3764 return;
3765
3766 one = alloc_filespec(concatpath);
3767 two = alloc_filespec(concatpath);
3768
3769 if (addremove != '+')
3770 fill_filespec(one, sha1, mode);
3771 if (addremove != '-') {
3772 fill_filespec(two, sha1, mode);
3773 two->dirty_submodule = dirty_submodule;
3774 }
3775
3776 diff_queue(&diff_queued_diff, one, two);
3777 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
3778 DIFF_OPT_SET(options, HAS_CHANGES);
3779 }
3780
3781 void diff_change(struct diff_options *options,
3782 unsigned old_mode, unsigned new_mode,
3783 const unsigned char *old_sha1,
3784 const unsigned char *new_sha1,
3785 const char *concatpath,
3786 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
3787 {
3788 struct diff_filespec *one, *two;
3789
3790 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3791 && S_ISGITLINK(new_mode))
3792 return;
3793
3794 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3795 unsigned tmp;
3796 const unsigned char *tmp_c;
3797 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3798 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3799 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
3800 new_dirty_submodule = tmp;
3801 }
3802
3803 if (options->prefix &&
3804 strncmp(concatpath, options->prefix, options->prefix_length))
3805 return;
3806
3807 one = alloc_filespec(concatpath);
3808 two = alloc_filespec(concatpath);
3809 fill_filespec(one, old_sha1, old_mode);
3810 fill_filespec(two, new_sha1, new_mode);
3811 one->dirty_submodule = old_dirty_submodule;
3812 two->dirty_submodule = new_dirty_submodule;
3813
3814 diff_queue(&diff_queued_diff, one, two);
3815 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
3816 DIFF_OPT_SET(options, HAS_CHANGES);
3817 }
3818
3819 void diff_unmerge(struct diff_options *options,
3820 const char *path,
3821 unsigned mode, const unsigned char *sha1)
3822 {
3823 struct diff_filespec *one, *two;
3824
3825 if (options->prefix &&
3826 strncmp(path, options->prefix, options->prefix_length))
3827 return;
3828
3829 one = alloc_filespec(path);
3830 two = alloc_filespec(path);
3831 fill_filespec(one, sha1, mode);
3832 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3833 }
3834
3835 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
3836 size_t *outsize)
3837 {
3838 struct diff_tempfile *temp;
3839 const char *argv[3];
3840 const char **arg = argv;
3841 struct child_process child;
3842 struct strbuf buf = STRBUF_INIT;
3843
3844 temp = prepare_temp_file(spec->path, spec);
3845 *arg++ = pgm;
3846 *arg++ = temp->name;
3847 *arg = NULL;
3848
3849 memset(&child, 0, sizeof(child));
3850 child.use_shell = 1;
3851 child.argv = argv;
3852 child.out = -1;
3853 if (start_command(&child) != 0 ||
3854 strbuf_read(&buf, child.out, 0) < 0 ||
3855 finish_command(&child) != 0) {
3856 close(child.out);
3857 strbuf_release(&buf);
3858 remove_tempfile();
3859 error("error running textconv command '%s'", pgm);
3860 return NULL;
3861 }
3862 close(child.out);
3863 remove_tempfile();
3864
3865 return strbuf_detach(&buf, outsize);
3866 }
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