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blame documentation: -M/-C notice copied lines as well as moved ones
[tgit.git] / diff.c
blobca37d44b94a1b89f16e701f28ab63dd5ff78cd54
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 #include "ll-merge.h"
18
19 #ifdef NO_FAST_WORKING_DIRECTORY
20 #define FAST_WORKING_DIRECTORY 0
21 #else
22 #define FAST_WORKING_DIRECTORY 1
23 #endif
24
25 static int diff_detect_rename_default;
26 static int diff_rename_limit_default = 200;
27 static int diff_suppress_blank_empty;
28 int diff_use_color_default = -1;
29 static const char *diff_word_regex_cfg;
30 static const char *external_diff_cmd_cfg;
31 int diff_auto_refresh_index = 1;
32 static int diff_mnemonic_prefix;
33
34 static char diff_colors[][COLOR_MAXLEN] = {
35 GIT_COLOR_RESET,
36 GIT_COLOR_NORMAL, /* PLAIN */
37 GIT_COLOR_BOLD, /* METAINFO */
38 GIT_COLOR_CYAN, /* FRAGINFO */
39 GIT_COLOR_RED, /* OLD */
40 GIT_COLOR_GREEN, /* NEW */
41 GIT_COLOR_YELLOW, /* COMMIT */
42 GIT_COLOR_BG_RED, /* WHITESPACE */
43 GIT_COLOR_NORMAL, /* FUNCINFO */
44 };
45
46 static void diff_filespec_load_driver(struct diff_filespec *one);
47 static char *run_textconv(const char *, struct diff_filespec *, size_t *);
48
49 static int parse_diff_color_slot(const char *var, int ofs)
50 {
51 if (!strcasecmp(var+ofs, "plain"))
52 return DIFF_PLAIN;
53 if (!strcasecmp(var+ofs, "meta"))
54 return DIFF_METAINFO;
55 if (!strcasecmp(var+ofs, "frag"))
56 return DIFF_FRAGINFO;
57 if (!strcasecmp(var+ofs, "old"))
58 return DIFF_FILE_OLD;
59 if (!strcasecmp(var+ofs, "new"))
60 return DIFF_FILE_NEW;
61 if (!strcasecmp(var+ofs, "commit"))
62 return DIFF_COMMIT;
63 if (!strcasecmp(var+ofs, "whitespace"))
64 return DIFF_WHITESPACE;
65 if (!strcasecmp(var+ofs, "func"))
66 return DIFF_FUNCINFO;
67 return -1;
68 }
69
70 static int git_config_rename(const char *var, const char *value)
71 {
72 if (!value)
73 return DIFF_DETECT_RENAME;
74 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
75 return DIFF_DETECT_COPY;
76 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
77 }
78
79 /*
80 * These are to give UI layer defaults.
81 * The core-level commands such as git-diff-files should
82 * never be affected by the setting of diff.renames
83 * the user happens to have in the configuration file.
84 */
85 int git_diff_ui_config(const char *var, const char *value, void *cb)
86 {
87 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
88 diff_use_color_default = git_config_colorbool(var, value, -1);
89 return 0;
90 }
91 if (!strcmp(var, "diff.renames")) {
92 diff_detect_rename_default = git_config_rename(var, value);
93 return 0;
94 }
95 if (!strcmp(var, "diff.autorefreshindex")) {
96 diff_auto_refresh_index = git_config_bool(var, value);
97 return 0;
98 }
99 if (!strcmp(var, "diff.mnemonicprefix")) {
100 diff_mnemonic_prefix = git_config_bool(var, value);
101 return 0;
102 }
103 if (!strcmp(var, "diff.external"))
104 return git_config_string(&external_diff_cmd_cfg, var, value);
105 if (!strcmp(var, "diff.wordregex"))
106 return git_config_string(&diff_word_regex_cfg, var, value);
107
108 return git_diff_basic_config(var, value, cb);
109 }
110
111 int git_diff_basic_config(const char *var, const char *value, void *cb)
112 {
113 if (!strcmp(var, "diff.renamelimit")) {
114 diff_rename_limit_default = git_config_int(var, value);
115 return 0;
116 }
117
118 switch (userdiff_config(var, value)) {
119 case 0: break;
120 case -1: return -1;
121 default: return 0;
122 }
123
124 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
125 int slot = parse_diff_color_slot(var, 11);
126 if (slot < 0)
127 return 0;
128 if (!value)
129 return config_error_nonbool(var);
130 color_parse(value, var, diff_colors[slot]);
131 return 0;
132 }
133
134 /* like GNU diff's --suppress-blank-empty option */
135 if (!strcmp(var, "diff.suppressblankempty") ||
136 /* for backwards compatibility */
137 !strcmp(var, "diff.suppress-blank-empty")) {
138 diff_suppress_blank_empty = git_config_bool(var, value);
139 return 0;
140 }
141
142 return git_color_default_config(var, value, cb);
143 }
144
145 static char *quote_two(const char *one, const char *two)
146 {
147 int need_one = quote_c_style(one, NULL, NULL, 1);
148 int need_two = quote_c_style(two, NULL, NULL, 1);
149 struct strbuf res = STRBUF_INIT;
150
151 if (need_one + need_two) {
152 strbuf_addch(&res, '"');
153 quote_c_style(one, &res, NULL, 1);
154 quote_c_style(two, &res, NULL, 1);
155 strbuf_addch(&res, '"');
156 } else {
157 strbuf_addstr(&res, one);
158 strbuf_addstr(&res, two);
159 }
160 return strbuf_detach(&res, NULL);
161 }
162
163 static const char *external_diff(void)
164 {
165 static const char *external_diff_cmd = NULL;
166 static int done_preparing = 0;
167
168 if (done_preparing)
169 return external_diff_cmd;
170 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
171 if (!external_diff_cmd)
172 external_diff_cmd = external_diff_cmd_cfg;
173 done_preparing = 1;
174 return external_diff_cmd;
175 }
176
177 static struct diff_tempfile {
178 const char *name; /* filename external diff should read from */
179 char hex[41];
180 char mode[10];
181 char tmp_path[PATH_MAX];
182 } diff_temp[2];
183
184 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
185
186 struct emit_callback {
187 int color_diff;
188 unsigned ws_rule;
189 int blank_at_eof_in_preimage;
190 int blank_at_eof_in_postimage;
191 int lno_in_preimage;
192 int lno_in_postimage;
193 sane_truncate_fn truncate;
194 const char **label_path;
195 struct diff_words_data *diff_words;
196 int *found_changesp;
197 FILE *file;
198 struct strbuf *header;
199 };
200
201 static int count_lines(const char *data, int size)
202 {
203 int count, ch, completely_empty = 1, nl_just_seen = 0;
204 count = 0;
205 while (0 < size--) {
206 ch = *data++;
207 if (ch == '\n') {
208 count++;
209 nl_just_seen = 1;
210 completely_empty = 0;
211 }
212 else {
213 nl_just_seen = 0;
214 completely_empty = 0;
215 }
216 }
217 if (completely_empty)
218 return 0;
219 if (!nl_just_seen)
220 count++; /* no trailing newline */
221 return count;
222 }
223
224 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
225 {
226 if (!DIFF_FILE_VALID(one)) {
227 mf->ptr = (char *)""; /* does not matter */
228 mf->size = 0;
229 return 0;
230 }
231 else if (diff_populate_filespec(one, 0))
232 return -1;
233
234 mf->ptr = one->data;
235 mf->size = one->size;
236 return 0;
237 }
238
239 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
240 {
241 char *ptr = mf->ptr;
242 long size = mf->size;
243 int cnt = 0;
244
245 if (!size)
246 return cnt;
247 ptr += size - 1; /* pointing at the very end */
248 if (*ptr != '\n')
249 ; /* incomplete line */
250 else
251 ptr--; /* skip the last LF */
252 while (mf->ptr < ptr) {
253 char *prev_eol;
254 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
255 if (*prev_eol == '\n')
256 break;
257 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
258 break;
259 cnt++;
260 ptr = prev_eol - 1;
261 }
262 return cnt;
263 }
264
265 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
266 struct emit_callback *ecbdata)
267 {
268 int l1, l2, at;
269 unsigned ws_rule = ecbdata->ws_rule;
270 l1 = count_trailing_blank(mf1, ws_rule);
271 l2 = count_trailing_blank(mf2, ws_rule);
272 if (l2 <= l1) {
273 ecbdata->blank_at_eof_in_preimage = 0;
274 ecbdata->blank_at_eof_in_postimage = 0;
275 return;
276 }
277 at = count_lines(mf1->ptr, mf1->size);
278 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
279
280 at = count_lines(mf2->ptr, mf2->size);
281 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
282 }
283
284 static void emit_line_0(FILE *file, const char *set, const char *reset,
285 int first, const char *line, int len)
286 {
287 int has_trailing_newline, has_trailing_carriage_return;
288 int nofirst;
289
290 if (len == 0) {
291 has_trailing_newline = (first == '\n');
292 has_trailing_carriage_return = (!has_trailing_newline &&
293 (first == '\r'));
294 nofirst = has_trailing_newline || has_trailing_carriage_return;
295 } else {
296 has_trailing_newline = (len > 0 && line[len-1] == '\n');
297 if (has_trailing_newline)
298 len--;
299 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
300 if (has_trailing_carriage_return)
301 len--;
302 nofirst = 0;
303 }
304
305 if (len || !nofirst) {
306 fputs(set, file);
307 if (!nofirst)
308 fputc(first, file);
309 fwrite(line, len, 1, file);
310 fputs(reset, file);
311 }
312 if (has_trailing_carriage_return)
313 fputc('\r', file);
314 if (has_trailing_newline)
315 fputc('\n', file);
316 }
317
318 static void emit_line(FILE *file, const char *set, const char *reset,
319 const char *line, int len)
320 {
321 emit_line_0(file, set, reset, line[0], line+1, len-1);
322 }
323
324 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
325 {
326 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
327 ecbdata->blank_at_eof_in_preimage &&
328 ecbdata->blank_at_eof_in_postimage &&
329 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
330 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
331 return 0;
332 return ws_blank_line(line, len, ecbdata->ws_rule);
333 }
334
335 static void emit_add_line(const char *reset,
336 struct emit_callback *ecbdata,
337 const char *line, int len)
338 {
339 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
340 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
341
342 if (!*ws)
343 emit_line_0(ecbdata->file, set, reset, '+', line, len);
344 else if (new_blank_line_at_eof(ecbdata, line, len))
345 /* Blank line at EOF - paint '+' as well */
346 emit_line_0(ecbdata->file, ws, reset, '+', line, len);
347 else {
348 /* Emit just the prefix, then the rest. */
349 emit_line_0(ecbdata->file, set, reset, '+', "", 0);
350 ws_check_emit(line, len, ecbdata->ws_rule,
351 ecbdata->file, set, reset, ws);
352 }
353 }
354
355 static void emit_hunk_header(struct emit_callback *ecbdata,
356 const char *line, int len)
357 {
358 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
359 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
360 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
361 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
362 static const char atat[2] = { '@', '@' };
363 const char *cp, *ep;
364
365 /*
366 * As a hunk header must begin with "@@ -<old>, +<new> @@",
367 * it always is at least 10 bytes long.
368 */
369 if (len < 10 ||
370 memcmp(line, atat, 2) ||
371 !(ep = memmem(line + 2, len - 2, atat, 2))) {
372 emit_line(ecbdata->file, plain, reset, line, len);
373 return;
374 }
375 ep += 2; /* skip over @@ */
376
377 /* The hunk header in fraginfo color */
378 emit_line(ecbdata->file, frag, reset, line, ep - line);
379
380 /* blank before the func header */
381 for (cp = ep; ep - line < len; ep++)
382 if (*ep != ' ' && *ep != '\t')
383 break;
384 if (ep != cp)
385 emit_line(ecbdata->file, plain, reset, cp, ep - cp);
386
387 if (ep < line + len)
388 emit_line(ecbdata->file, func, reset, ep, line + len - ep);
389 }
390
391 static struct diff_tempfile *claim_diff_tempfile(void) {
392 int i;
393 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
394 if (!diff_temp[i].name)
395 return diff_temp + i;
396 die("BUG: diff is failing to clean up its tempfiles");
397 }
398
399 static int remove_tempfile_installed;
400
401 static void remove_tempfile(void)
402 {
403 int i;
404 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
405 if (diff_temp[i].name == diff_temp[i].tmp_path)
406 unlink_or_warn(diff_temp[i].name);
407 diff_temp[i].name = NULL;
408 }
409 }
410
411 static void remove_tempfile_on_signal(int signo)
412 {
413 remove_tempfile();
414 sigchain_pop(signo);
415 raise(signo);
416 }
417
418 static void print_line_count(FILE *file, int count)
419 {
420 switch (count) {
421 case 0:
422 fprintf(file, "0,0");
423 break;
424 case 1:
425 fprintf(file, "1");
426 break;
427 default:
428 fprintf(file, "1,%d", count);
429 break;
430 }
431 }
432
433 static void emit_rewrite_lines(struct emit_callback *ecb,
434 int prefix, const char *data, int size)
435 {
436 const char *endp = NULL;
437 static const char *nneof = " No newline at end of file\n";
438 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
439 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
440
441 while (0 < size) {
442 int len;
443
444 endp = memchr(data, '\n', size);
445 len = endp ? (endp - data + 1) : size;
446 if (prefix != '+') {
447 ecb->lno_in_preimage++;
448 emit_line_0(ecb->file, old, reset, '-',
449 data, len);
450 } else {
451 ecb->lno_in_postimage++;
452 emit_add_line(reset, ecb, data, len);
453 }
454 size -= len;
455 data += len;
456 }
457 if (!endp) {
458 const char *plain = diff_get_color(ecb->color_diff,
459 DIFF_PLAIN);
460 emit_line_0(ecb->file, plain, reset, '\\',
461 nneof, strlen(nneof));
462 }
463 }
464
465 static void emit_rewrite_diff(const char *name_a,
466 const char *name_b,
467 struct diff_filespec *one,
468 struct diff_filespec *two,
469 const char *textconv_one,
470 const char *textconv_two,
471 struct diff_options *o)
472 {
473 int lc_a, lc_b;
474 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
475 const char *name_a_tab, *name_b_tab;
476 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
477 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
478 const char *reset = diff_get_color(color_diff, DIFF_RESET);
479 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
480 const char *a_prefix, *b_prefix;
481 const char *data_one, *data_two;
482 size_t size_one, size_two;
483 struct emit_callback ecbdata;
484
485 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
486 a_prefix = o->b_prefix;
487 b_prefix = o->a_prefix;
488 } else {
489 a_prefix = o->a_prefix;
490 b_prefix = o->b_prefix;
491 }
492
493 name_a += (*name_a == '/');
494 name_b += (*name_b == '/');
495 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
496 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
497
498 strbuf_reset(&a_name);
499 strbuf_reset(&b_name);
500 quote_two_c_style(&a_name, a_prefix, name_a, 0);
501 quote_two_c_style(&b_name, b_prefix, name_b, 0);
502
503 diff_populate_filespec(one, 0);
504 diff_populate_filespec(two, 0);
505 if (textconv_one) {
506 data_one = run_textconv(textconv_one, one, &size_one);
507 if (!data_one)
508 die("unable to read files to diff");
509 }
510 else {
511 data_one = one->data;
512 size_one = one->size;
513 }
514 if (textconv_two) {
515 data_two = run_textconv(textconv_two, two, &size_two);
516 if (!data_two)
517 die("unable to read files to diff");
518 }
519 else {
520 data_two = two->data;
521 size_two = two->size;
522 }
523
524 memset(&ecbdata, 0, sizeof(ecbdata));
525 ecbdata.color_diff = color_diff;
526 ecbdata.found_changesp = &o->found_changes;
527 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
528 ecbdata.file = o->file;
529 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
530 mmfile_t mf1, mf2;
531 mf1.ptr = (char *)data_one;
532 mf2.ptr = (char *)data_two;
533 mf1.size = size_one;
534 mf2.size = size_two;
535 check_blank_at_eof(&mf1, &mf2, &ecbdata);
536 }
537 ecbdata.lno_in_preimage = 1;
538 ecbdata.lno_in_postimage = 1;
539
540 lc_a = count_lines(data_one, size_one);
541 lc_b = count_lines(data_two, size_two);
542 fprintf(o->file,
543 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
544 metainfo, a_name.buf, name_a_tab, reset,
545 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
546 print_line_count(o->file, lc_a);
547 fprintf(o->file, " +");
548 print_line_count(o->file, lc_b);
549 fprintf(o->file, " @@%s\n", reset);
550 if (lc_a)
551 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
552 if (lc_b)
553 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
554 }
555
556 struct diff_words_buffer {
557 mmfile_t text;
558 long alloc;
559 struct diff_words_orig {
560 const char *begin, *end;
561 } *orig;
562 int orig_nr, orig_alloc;
563 };
564
565 static void diff_words_append(char *line, unsigned long len,
566 struct diff_words_buffer *buffer)
567 {
568 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
569 line++;
570 len--;
571 memcpy(buffer->text.ptr + buffer->text.size, line, len);
572 buffer->text.size += len;
573 buffer->text.ptr[buffer->text.size] = '\0';
574 }
575
576 struct diff_words_data {
577 struct diff_words_buffer minus, plus;
578 const char *current_plus;
579 FILE *file;
580 regex_t *word_regex;
581 };
582
583 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
584 {
585 struct diff_words_data *diff_words = priv;
586 int minus_first, minus_len, plus_first, plus_len;
587 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
588
589 if (line[0] != '@' || parse_hunk_header(line, len,
590 &minus_first, &minus_len, &plus_first, &plus_len))
591 return;
592
593 /* POSIX requires that first be decremented by one if len == 0... */
594 if (minus_len) {
595 minus_begin = diff_words->minus.orig[minus_first].begin;
596 minus_end =
597 diff_words->minus.orig[minus_first + minus_len - 1].end;
598 } else
599 minus_begin = minus_end =
600 diff_words->minus.orig[minus_first].end;
601
602 if (plus_len) {
603 plus_begin = diff_words->plus.orig[plus_first].begin;
604 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
605 } else
606 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
607
608 if (diff_words->current_plus != plus_begin)
609 fwrite(diff_words->current_plus,
610 plus_begin - diff_words->current_plus, 1,
611 diff_words->file);
612 if (minus_begin != minus_end)
613 color_fwrite_lines(diff_words->file,
614 diff_get_color(1, DIFF_FILE_OLD),
615 minus_end - minus_begin, minus_begin);
616 if (plus_begin != plus_end)
617 color_fwrite_lines(diff_words->file,
618 diff_get_color(1, DIFF_FILE_NEW),
619 plus_end - plus_begin, plus_begin);
620
621 diff_words->current_plus = plus_end;
622 }
623
624 /* This function starts looking at *begin, and returns 0 iff a word was found. */
625 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
626 int *begin, int *end)
627 {
628 if (word_regex && *begin < buffer->size) {
629 regmatch_t match[1];
630 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
631 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
632 '\n', match[0].rm_eo - match[0].rm_so);
633 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
634 *begin += match[0].rm_so;
635 return *begin >= *end;
636 }
637 return -1;
638 }
639
640 /* find the next word */
641 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
642 (*begin)++;
643 if (*begin >= buffer->size)
644 return -1;
645
646 /* find the end of the word */
647 *end = *begin + 1;
648 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
649 (*end)++;
650
651 return 0;
652 }
653
654 /*
655 * This function splits the words in buffer->text, stores the list with
656 * newline separator into out, and saves the offsets of the original words
657 * in buffer->orig.
658 */
659 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
660 regex_t *word_regex)
661 {
662 int i, j;
663 long alloc = 0;
664
665 out->size = 0;
666 out->ptr = NULL;
667
668 /* fake an empty "0th" word */
669 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
670 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
671 buffer->orig_nr = 1;
672
673 for (i = 0; i < buffer->text.size; i++) {
674 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
675 return;
676
677 /* store original boundaries */
678 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
679 buffer->orig_alloc);
680 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
681 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
682 buffer->orig_nr++;
683
684 /* store one word */
685 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
686 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
687 out->ptr[out->size + j - i] = '\n';
688 out->size += j - i + 1;
689
690 i = j - 1;
691 }
692 }
693
694 /* this executes the word diff on the accumulated buffers */
695 static void diff_words_show(struct diff_words_data *diff_words)
696 {
697 xpparam_t xpp;
698 xdemitconf_t xecfg;
699 xdemitcb_t ecb;
700 mmfile_t minus, plus;
701
702 /* special case: only removal */
703 if (!diff_words->plus.text.size) {
704 color_fwrite_lines(diff_words->file,
705 diff_get_color(1, DIFF_FILE_OLD),
706 diff_words->minus.text.size, diff_words->minus.text.ptr);
707 diff_words->minus.text.size = 0;
708 return;
709 }
710
711 diff_words->current_plus = diff_words->plus.text.ptr;
712
713 memset(&xpp, 0, sizeof(xpp));
714 memset(&xecfg, 0, sizeof(xecfg));
715 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
716 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
717 xpp.flags = XDF_NEED_MINIMAL;
718 /* as only the hunk header will be parsed, we need a 0-context */
719 xecfg.ctxlen = 0;
720 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
721 &xpp, &xecfg, &ecb);
722 free(minus.ptr);
723 free(plus.ptr);
724 if (diff_words->current_plus != diff_words->plus.text.ptr +
725 diff_words->plus.text.size)
726 fwrite(diff_words->current_plus,
727 diff_words->plus.text.ptr + diff_words->plus.text.size
728 - diff_words->current_plus, 1,
729 diff_words->file);
730 diff_words->minus.text.size = diff_words->plus.text.size = 0;
731 }
732
733 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
734 static void diff_words_flush(struct emit_callback *ecbdata)
735 {
736 if (ecbdata->diff_words->minus.text.size ||
737 ecbdata->diff_words->plus.text.size)
738 diff_words_show(ecbdata->diff_words);
739 }
740
741 static void free_diff_words_data(struct emit_callback *ecbdata)
742 {
743 if (ecbdata->diff_words) {
744 diff_words_flush(ecbdata);
745 free (ecbdata->diff_words->minus.text.ptr);
746 free (ecbdata->diff_words->minus.orig);
747 free (ecbdata->diff_words->plus.text.ptr);
748 free (ecbdata->diff_words->plus.orig);
749 free(ecbdata->diff_words->word_regex);
750 free(ecbdata->diff_words);
751 ecbdata->diff_words = NULL;
752 }
753 }
754
755 const char *diff_get_color(int diff_use_color, enum color_diff ix)
756 {
757 if (diff_use_color)
758 return diff_colors[ix];
759 return "";
760 }
761
762 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
763 {
764 const char *cp;
765 unsigned long allot;
766 size_t l = len;
767
768 if (ecb->truncate)
769 return ecb->truncate(line, len);
770 cp = line;
771 allot = l;
772 while (0 < l) {
773 (void) utf8_width(&cp, &l);
774 if (!cp)
775 break; /* truncated in the middle? */
776 }
777 return allot - l;
778 }
779
780 static void find_lno(const char *line, struct emit_callback *ecbdata)
781 {
782 const char *p;
783 ecbdata->lno_in_preimage = 0;
784 ecbdata->lno_in_postimage = 0;
785 p = strchr(line, '-');
786 if (!p)
787 return; /* cannot happen */
788 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
789 p = strchr(p, '+');
790 if (!p)
791 return; /* cannot happen */
792 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
793 }
794
795 static void fn_out_consume(void *priv, char *line, unsigned long len)
796 {
797 struct emit_callback *ecbdata = priv;
798 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
799 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
800 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
801
802 if (ecbdata->header) {
803 fprintf(ecbdata->file, "%s", ecbdata->header->buf);
804 strbuf_reset(ecbdata->header);
805 ecbdata->header = NULL;
806 }
807 *(ecbdata->found_changesp) = 1;
808
809 if (ecbdata->label_path[0]) {
810 const char *name_a_tab, *name_b_tab;
811
812 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
813 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
814
815 fprintf(ecbdata->file, "%s--- %s%s%s\n",
816 meta, ecbdata->label_path[0], reset, name_a_tab);
817 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
818 meta, ecbdata->label_path[1], reset, name_b_tab);
819 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
820 }
821
822 if (diff_suppress_blank_empty
823 && len == 2 && line[0] == ' ' && line[1] == '\n') {
824 line[0] = '\n';
825 len = 1;
826 }
827
828 if (line[0] == '@') {
829 if (ecbdata->diff_words)
830 diff_words_flush(ecbdata);
831 len = sane_truncate_line(ecbdata, line, len);
832 find_lno(line, ecbdata);
833 emit_hunk_header(ecbdata, line, len);
834 if (line[len-1] != '\n')
835 putc('\n', ecbdata->file);
836 return;
837 }
838
839 if (len < 1) {
840 emit_line(ecbdata->file, reset, reset, line, len);
841 return;
842 }
843
844 if (ecbdata->diff_words) {
845 if (line[0] == '-') {
846 diff_words_append(line, len,
847 &ecbdata->diff_words->minus);
848 return;
849 } else if (line[0] == '+') {
850 diff_words_append(line, len,
851 &ecbdata->diff_words->plus);
852 return;
853 }
854 diff_words_flush(ecbdata);
855 line++;
856 len--;
857 emit_line(ecbdata->file, plain, reset, line, len);
858 return;
859 }
860
861 if (line[0] != '+') {
862 const char *color =
863 diff_get_color(ecbdata->color_diff,
864 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
865 ecbdata->lno_in_preimage++;
866 if (line[0] == ' ')
867 ecbdata->lno_in_postimage++;
868 emit_line(ecbdata->file, color, reset, line, len);
869 } else {
870 ecbdata->lno_in_postimage++;
871 emit_add_line(reset, ecbdata, line + 1, len - 1);
872 }
873 }
874
875 static char *pprint_rename(const char *a, const char *b)
876 {
877 const char *old = a;
878 const char *new = b;
879 struct strbuf name = STRBUF_INIT;
880 int pfx_length, sfx_length;
881 int len_a = strlen(a);
882 int len_b = strlen(b);
883 int a_midlen, b_midlen;
884 int qlen_a = quote_c_style(a, NULL, NULL, 0);
885 int qlen_b = quote_c_style(b, NULL, NULL, 0);
886
887 if (qlen_a || qlen_b) {
888 quote_c_style(a, &name, NULL, 0);
889 strbuf_addstr(&name, " => ");
890 quote_c_style(b, &name, NULL, 0);
891 return strbuf_detach(&name, NULL);
892 }
893
894 /* Find common prefix */
895 pfx_length = 0;
896 while (*old && *new && *old == *new) {
897 if (*old == '/')
898 pfx_length = old - a + 1;
899 old++;
900 new++;
901 }
902
903 /* Find common suffix */
904 old = a + len_a;
905 new = b + len_b;
906 sfx_length = 0;
907 while (a <= old && b <= new && *old == *new) {
908 if (*old == '/')
909 sfx_length = len_a - (old - a);
910 old--;
911 new--;
912 }
913
914 /*
915 * pfx{mid-a => mid-b}sfx
916 * {pfx-a => pfx-b}sfx
917 * pfx{sfx-a => sfx-b}
918 * name-a => name-b
919 */
920 a_midlen = len_a - pfx_length - sfx_length;
921 b_midlen = len_b - pfx_length - sfx_length;
922 if (a_midlen < 0)
923 a_midlen = 0;
924 if (b_midlen < 0)
925 b_midlen = 0;
926
927 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
928 if (pfx_length + sfx_length) {
929 strbuf_add(&name, a, pfx_length);
930 strbuf_addch(&name, '{');
931 }
932 strbuf_add(&name, a + pfx_length, a_midlen);
933 strbuf_addstr(&name, " => ");
934 strbuf_add(&name, b + pfx_length, b_midlen);
935 if (pfx_length + sfx_length) {
936 strbuf_addch(&name, '}');
937 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
938 }
939 return strbuf_detach(&name, NULL);
940 }
941
942 struct diffstat_t {
943 int nr;
944 int alloc;
945 struct diffstat_file {
946 char *from_name;
947 char *name;
948 char *print_name;
949 unsigned is_unmerged:1;
950 unsigned is_binary:1;
951 unsigned is_renamed:1;
952 unsigned int added, deleted;
953 } **files;
954 };
955
956 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
957 const char *name_a,
958 const char *name_b)
959 {
960 struct diffstat_file *x;
961 x = xcalloc(sizeof (*x), 1);
962 if (diffstat->nr == diffstat->alloc) {
963 diffstat->alloc = alloc_nr(diffstat->alloc);
964 diffstat->files = xrealloc(diffstat->files,
965 diffstat->alloc * sizeof(x));
966 }
967 diffstat->files[diffstat->nr++] = x;
968 if (name_b) {
969 x->from_name = xstrdup(name_a);
970 x->name = xstrdup(name_b);
971 x->is_renamed = 1;
972 }
973 else {
974 x->from_name = NULL;
975 x->name = xstrdup(name_a);
976 }
977 return x;
978 }
979
980 static void diffstat_consume(void *priv, char *line, unsigned long len)
981 {
982 struct diffstat_t *diffstat = priv;
983 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
984
985 if (line[0] == '+')
986 x->added++;
987 else if (line[0] == '-')
988 x->deleted++;
989 }
990
991 const char mime_boundary_leader[] = "------------";
992
993 static int scale_linear(int it, int width, int max_change)
994 {
995 /*
996 * make sure that at least one '-' is printed if there were deletions,
997 * and likewise for '+'.
998 */
999 if (max_change < 2)
1000 return it;
1001 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
1002 }
1003
1004 static void show_name(FILE *file,
1005 const char *prefix, const char *name, int len)
1006 {
1007 fprintf(file, " %s%-*s |", prefix, len, name);
1008 }
1009
1010 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1011 {
1012 if (cnt <= 0)
1013 return;
1014 fprintf(file, "%s", set);
1015 while (cnt--)
1016 putc(ch, file);
1017 fprintf(file, "%s", reset);
1018 }
1019
1020 static void fill_print_name(struct diffstat_file *file)
1021 {
1022 char *pname;
1023
1024 if (file->print_name)
1025 return;
1026
1027 if (!file->is_renamed) {
1028 struct strbuf buf = STRBUF_INIT;
1029 if (quote_c_style(file->name, &buf, NULL, 0)) {
1030 pname = strbuf_detach(&buf, NULL);
1031 } else {
1032 pname = file->name;
1033 strbuf_release(&buf);
1034 }
1035 } else {
1036 pname = pprint_rename(file->from_name, file->name);
1037 }
1038 file->print_name = pname;
1039 }
1040
1041 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1042 {
1043 int i, len, add, del, adds = 0, dels = 0;
1044 int max_change = 0, max_len = 0;
1045 int total_files = data->nr;
1046 int width, name_width;
1047 const char *reset, *set, *add_c, *del_c;
1048
1049 if (data->nr == 0)
1050 return;
1051
1052 width = options->stat_width ? options->stat_width : 80;
1053 name_width = options->stat_name_width ? options->stat_name_width : 50;
1054
1055 /* Sanity: give at least 5 columns to the graph,
1056 * but leave at least 10 columns for the name.
1057 */
1058 if (width < 25)
1059 width = 25;
1060 if (name_width < 10)
1061 name_width = 10;
1062 else if (width < name_width + 15)
1063 name_width = width - 15;
1064
1065 /* Find the longest filename and max number of changes */
1066 reset = diff_get_color_opt(options, DIFF_RESET);
1067 set = diff_get_color_opt(options, DIFF_PLAIN);
1068 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1069 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1070
1071 for (i = 0; i < data->nr; i++) {
1072 struct diffstat_file *file = data->files[i];
1073 int change = file->added + file->deleted;
1074 fill_print_name(file);
1075 len = strlen(file->print_name);
1076 if (max_len < len)
1077 max_len = len;
1078
1079 if (file->is_binary || file->is_unmerged)
1080 continue;
1081 if (max_change < change)
1082 max_change = change;
1083 }
1084
1085 /* Compute the width of the graph part;
1086 * 10 is for one blank at the beginning of the line plus
1087 * " | count " between the name and the graph.
1088 *
1089 * From here on, name_width is the width of the name area,
1090 * and width is the width of the graph area.
1091 */
1092 name_width = (name_width < max_len) ? name_width : max_len;
1093 if (width < (name_width + 10) + max_change)
1094 width = width - (name_width + 10);
1095 else
1096 width = max_change;
1097
1098 for (i = 0; i < data->nr; i++) {
1099 const char *prefix = "";
1100 char *name = data->files[i]->print_name;
1101 int added = data->files[i]->added;
1102 int deleted = data->files[i]->deleted;
1103 int name_len;
1104
1105 /*
1106 * "scale" the filename
1107 */
1108 len = name_width;
1109 name_len = strlen(name);
1110 if (name_width < name_len) {
1111 char *slash;
1112 prefix = "...";
1113 len -= 3;
1114 name += name_len - len;
1115 slash = strchr(name, '/');
1116 if (slash)
1117 name = slash;
1118 }
1119
1120 if (data->files[i]->is_binary) {
1121 show_name(options->file, prefix, name, len);
1122 fprintf(options->file, " Bin ");
1123 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
1124 fprintf(options->file, " -> ");
1125 fprintf(options->file, "%s%d%s", add_c, added, reset);
1126 fprintf(options->file, " bytes");
1127 fprintf(options->file, "\n");
1128 continue;
1129 }
1130 else if (data->files[i]->is_unmerged) {
1131 show_name(options->file, prefix, name, len);
1132 fprintf(options->file, " Unmerged\n");
1133 continue;
1134 }
1135 else if (!data->files[i]->is_renamed &&
1136 (added + deleted == 0)) {
1137 total_files--;
1138 continue;
1139 }
1140
1141 /*
1142 * scale the add/delete
1143 */
1144 add = added;
1145 del = deleted;
1146 adds += add;
1147 dels += del;
1148
1149 if (width <= max_change) {
1150 add = scale_linear(add, width, max_change);
1151 del = scale_linear(del, width, max_change);
1152 }
1153 show_name(options->file, prefix, name, len);
1154 fprintf(options->file, "%5d%s", added + deleted,
1155 added + deleted ? " " : "");
1156 show_graph(options->file, '+', add, add_c, reset);
1157 show_graph(options->file, '-', del, del_c, reset);
1158 fprintf(options->file, "\n");
1159 }
1160 fprintf(options->file,
1161 " %d files changed, %d insertions(+), %d deletions(-)\n",
1162 total_files, adds, dels);
1163 }
1164
1165 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1166 {
1167 int i, adds = 0, dels = 0, total_files = data->nr;
1168
1169 if (data->nr == 0)
1170 return;
1171
1172 for (i = 0; i < data->nr; i++) {
1173 if (!data->files[i]->is_binary &&
1174 !data->files[i]->is_unmerged) {
1175 int added = data->files[i]->added;
1176 int deleted= data->files[i]->deleted;
1177 if (!data->files[i]->is_renamed &&
1178 (added + deleted == 0)) {
1179 total_files--;
1180 } else {
1181 adds += added;
1182 dels += deleted;
1183 }
1184 }
1185 }
1186 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1187 total_files, adds, dels);
1188 }
1189
1190 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1191 {
1192 int i;
1193
1194 if (data->nr == 0)
1195 return;
1196
1197 for (i = 0; i < data->nr; i++) {
1198 struct diffstat_file *file = data->files[i];
1199
1200 if (file->is_binary)
1201 fprintf(options->file, "-\t-\t");
1202 else
1203 fprintf(options->file,
1204 "%d\t%d\t", file->added, file->deleted);
1205 if (options->line_termination) {
1206 fill_print_name(file);
1207 if (!file->is_renamed)
1208 write_name_quoted(file->name, options->file,
1209 options->line_termination);
1210 else {
1211 fputs(file->print_name, options->file);
1212 putc(options->line_termination, options->file);
1213 }
1214 } else {
1215 if (file->is_renamed) {
1216 putc('\0', options->file);
1217 write_name_quoted(file->from_name, options->file, '\0');
1218 }
1219 write_name_quoted(file->name, options->file, '\0');
1220 }
1221 }
1222 }
1223
1224 struct dirstat_file {
1225 const char *name;
1226 unsigned long changed;
1227 };
1228
1229 struct dirstat_dir {
1230 struct dirstat_file *files;
1231 int alloc, nr, percent, cumulative;
1232 };
1233
1234 static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
1235 {
1236 unsigned long this_dir = 0;
1237 unsigned int sources = 0;
1238
1239 while (dir->nr) {
1240 struct dirstat_file *f = dir->files;
1241 int namelen = strlen(f->name);
1242 unsigned long this;
1243 char *slash;
1244
1245 if (namelen < baselen)
1246 break;
1247 if (memcmp(f->name, base, baselen))
1248 break;
1249 slash = strchr(f->name + baselen, '/');
1250 if (slash) {
1251 int newbaselen = slash + 1 - f->name;
1252 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
1253 sources++;
1254 } else {
1255 this = f->changed;
1256 dir->files++;
1257 dir->nr--;
1258 sources += 2;
1259 }
1260 this_dir += this;
1261 }
1262
1263 /*
1264 * We don't report dirstat's for
1265 * - the top level
1266 * - or cases where everything came from a single directory
1267 * under this directory (sources == 1).
1268 */
1269 if (baselen && sources != 1) {
1270 int permille = this_dir * 1000 / changed;
1271 if (permille) {
1272 int percent = permille / 10;
1273 if (percent >= dir->percent) {
1274 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1275 if (!dir->cumulative)
1276 return 0;
1277 }
1278 }
1279 }
1280 return this_dir;
1281 }
1282
1283 static int dirstat_compare(const void *_a, const void *_b)
1284 {
1285 const struct dirstat_file *a = _a;
1286 const struct dirstat_file *b = _b;
1287 return strcmp(a->name, b->name);
1288 }
1289
1290 static void show_dirstat(struct diff_options *options)
1291 {
1292 int i;
1293 unsigned long changed;
1294 struct dirstat_dir dir;
1295 struct diff_queue_struct *q = &diff_queued_diff;
1296
1297 dir.files = NULL;
1298 dir.alloc = 0;
1299 dir.nr = 0;
1300 dir.percent = options->dirstat_percent;
1301 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1302
1303 changed = 0;
1304 for (i = 0; i < q->nr; i++) {
1305 struct diff_filepair *p = q->queue[i];
1306 const char *name;
1307 unsigned long copied, added, damage;
1308
1309 name = p->one->path ? p->one->path : p->two->path;
1310
1311 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1312 diff_populate_filespec(p->one, 0);
1313 diff_populate_filespec(p->two, 0);
1314 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1315 &copied, &added);
1316 diff_free_filespec_data(p->one);
1317 diff_free_filespec_data(p->two);
1318 } else if (DIFF_FILE_VALID(p->one)) {
1319 diff_populate_filespec(p->one, 1);
1320 copied = added = 0;
1321 diff_free_filespec_data(p->one);
1322 } else if (DIFF_FILE_VALID(p->two)) {
1323 diff_populate_filespec(p->two, 1);
1324 copied = 0;
1325 added = p->two->size;
1326 diff_free_filespec_data(p->two);
1327 } else
1328 continue;
1329
1330 /*
1331 * Original minus copied is the removed material,
1332 * added is the new material. They are both damages
1333 * made to the preimage. In --dirstat-by-file mode, count
1334 * damaged files, not damaged lines. This is done by
1335 * counting only a single damaged line per file.
1336 */
1337 damage = (p->one->size - copied) + added;
1338 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1339 damage = 1;
1340
1341 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1342 dir.files[dir.nr].name = name;
1343 dir.files[dir.nr].changed = damage;
1344 changed += damage;
1345 dir.nr++;
1346 }
1347
1348 /* This can happen even with many files, if everything was renames */
1349 if (!changed)
1350 return;
1351
1352 /* Show all directories with more than x% of the changes */
1353 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1354 gather_dirstat(options->file, &dir, changed, "", 0);
1355 }
1356
1357 static void free_diffstat_info(struct diffstat_t *diffstat)
1358 {
1359 int i;
1360 for (i = 0; i < diffstat->nr; i++) {
1361 struct diffstat_file *f = diffstat->files[i];
1362 if (f->name != f->print_name)
1363 free(f->print_name);
1364 free(f->name);
1365 free(f->from_name);
1366 free(f);
1367 }
1368 free(diffstat->files);
1369 }
1370
1371 struct checkdiff_t {
1372 const char *filename;
1373 int lineno;
1374 int conflict_marker_size;
1375 struct diff_options *o;
1376 unsigned ws_rule;
1377 unsigned status;
1378 };
1379
1380 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1381 {
1382 char firstchar;
1383 int cnt;
1384
1385 if (len < marker_size + 1)
1386 return 0;
1387 firstchar = line[0];
1388 switch (firstchar) {
1389 case '=': case '>': case '<': case '|':
1390 break;
1391 default:
1392 return 0;
1393 }
1394 for (cnt = 1; cnt < marker_size; cnt++)
1395 if (line[cnt] != firstchar)
1396 return 0;
1397 /* line[1] thru line[marker_size-1] are same as firstchar */
1398 if (len < marker_size + 1 || !isspace(line[marker_size]))
1399 return 0;
1400 return 1;
1401 }
1402
1403 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1404 {
1405 struct checkdiff_t *data = priv;
1406 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1407 int marker_size = data->conflict_marker_size;
1408 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1409 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1410 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1411 char *err;
1412
1413 if (line[0] == '+') {
1414 unsigned bad;
1415 data->lineno++;
1416 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1417 data->status |= 1;
1418 fprintf(data->o->file,
1419 "%s:%d: leftover conflict marker\n",
1420 data->filename, data->lineno);
1421 }
1422 bad = ws_check(line + 1, len - 1, data->ws_rule);
1423 if (!bad)
1424 return;
1425 data->status |= bad;
1426 err = whitespace_error_string(bad);
1427 fprintf(data->o->file, "%s:%d: %s.\n",
1428 data->filename, data->lineno, err);
1429 free(err);
1430 emit_line(data->o->file, set, reset, line, 1);
1431 ws_check_emit(line + 1, len - 1, data->ws_rule,
1432 data->o->file, set, reset, ws);
1433 } else if (line[0] == ' ') {
1434 data->lineno++;
1435 } else if (line[0] == '@') {
1436 char *plus = strchr(line, '+');
1437 if (plus)
1438 data->lineno = strtol(plus, NULL, 10) - 1;
1439 else
1440 die("invalid diff");
1441 }
1442 }
1443
1444 static unsigned char *deflate_it(char *data,
1445 unsigned long size,
1446 unsigned long *result_size)
1447 {
1448 int bound;
1449 unsigned char *deflated;
1450 z_stream stream;
1451
1452 memset(&stream, 0, sizeof(stream));
1453 deflateInit(&stream, zlib_compression_level);
1454 bound = deflateBound(&stream, size);
1455 deflated = xmalloc(bound);
1456 stream.next_out = deflated;
1457 stream.avail_out = bound;
1458
1459 stream.next_in = (unsigned char *)data;
1460 stream.avail_in = size;
1461 while (deflate(&stream, Z_FINISH) == Z_OK)
1462 ; /* nothing */
1463 deflateEnd(&stream);
1464 *result_size = stream.total_out;
1465 return deflated;
1466 }
1467
1468 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
1469 {
1470 void *cp;
1471 void *delta;
1472 void *deflated;
1473 void *data;
1474 unsigned long orig_size;
1475 unsigned long delta_size;
1476 unsigned long deflate_size;
1477 unsigned long data_size;
1478
1479 /* We could do deflated delta, or we could do just deflated two,
1480 * whichever is smaller.
1481 */
1482 delta = NULL;
1483 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1484 if (one->size && two->size) {
1485 delta = diff_delta(one->ptr, one->size,
1486 two->ptr, two->size,
1487 &delta_size, deflate_size);
1488 if (delta) {
1489 void *to_free = delta;
1490 orig_size = delta_size;
1491 delta = deflate_it(delta, delta_size, &delta_size);
1492 free(to_free);
1493 }
1494 }
1495
1496 if (delta && delta_size < deflate_size) {
1497 fprintf(file, "delta %lu\n", orig_size);
1498 free(deflated);
1499 data = delta;
1500 data_size = delta_size;
1501 }
1502 else {
1503 fprintf(file, "literal %lu\n", two->size);
1504 free(delta);
1505 data = deflated;
1506 data_size = deflate_size;
1507 }
1508
1509 /* emit data encoded in base85 */
1510 cp = data;
1511 while (data_size) {
1512 int bytes = (52 < data_size) ? 52 : data_size;
1513 char line[70];
1514 data_size -= bytes;
1515 if (bytes <= 26)
1516 line[0] = bytes + 'A' - 1;
1517 else
1518 line[0] = bytes - 26 + 'a' - 1;
1519 encode_85(line + 1, cp, bytes);
1520 cp = (char *) cp + bytes;
1521 fputs(line, file);
1522 fputc('\n', file);
1523 }
1524 fprintf(file, "\n");
1525 free(data);
1526 }
1527
1528 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
1529 {
1530 fprintf(file, "GIT binary patch\n");
1531 emit_binary_diff_body(file, one, two);
1532 emit_binary_diff_body(file, two, one);
1533 }
1534
1535 static void diff_filespec_load_driver(struct diff_filespec *one)
1536 {
1537 if (!one->driver)
1538 one->driver = userdiff_find_by_path(one->path);
1539 if (!one->driver)
1540 one->driver = userdiff_find_by_name("default");
1541 }
1542
1543 int diff_filespec_is_binary(struct diff_filespec *one)
1544 {
1545 if (one->is_binary == -1) {
1546 diff_filespec_load_driver(one);
1547 if (one->driver->binary != -1)
1548 one->is_binary = one->driver->binary;
1549 else {
1550 if (!one->data && DIFF_FILE_VALID(one))
1551 diff_populate_filespec(one, 0);
1552 if (one->data)
1553 one->is_binary = buffer_is_binary(one->data,
1554 one->size);
1555 if (one->is_binary == -1)
1556 one->is_binary = 0;
1557 }
1558 }
1559 return one->is_binary;
1560 }
1561
1562 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1563 {
1564 diff_filespec_load_driver(one);
1565 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1566 }
1567
1568 static const char *userdiff_word_regex(struct diff_filespec *one)
1569 {
1570 diff_filespec_load_driver(one);
1571 return one->driver->word_regex;
1572 }
1573
1574 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1575 {
1576 if (!options->a_prefix)
1577 options->a_prefix = a;
1578 if (!options->b_prefix)
1579 options->b_prefix = b;
1580 }
1581
1582 static const char *get_textconv(struct diff_filespec *one)
1583 {
1584 if (!DIFF_FILE_VALID(one))
1585 return NULL;
1586 if (!S_ISREG(one->mode))
1587 return NULL;
1588 diff_filespec_load_driver(one);
1589 return one->driver->textconv;
1590 }
1591
1592 static void builtin_diff(const char *name_a,
1593 const char *name_b,
1594 struct diff_filespec *one,
1595 struct diff_filespec *two,
1596 const char *xfrm_msg,
1597 struct diff_options *o,
1598 int complete_rewrite)
1599 {
1600 mmfile_t mf1, mf2;
1601 const char *lbl[2];
1602 char *a_one, *b_two;
1603 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1604 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1605 const char *a_prefix, *b_prefix;
1606 const char *textconv_one = NULL, *textconv_two = NULL;
1607 struct strbuf header = STRBUF_INIT;
1608
1609 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
1610 (!one->mode || S_ISGITLINK(one->mode)) &&
1611 (!two->mode || S_ISGITLINK(two->mode))) {
1612 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
1613 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
1614 show_submodule_summary(o->file, one ? one->path : two->path,
1615 one->sha1, two->sha1, two->dirty_submodule,
1616 del, add, reset);
1617 return;
1618 }
1619
1620 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1621 textconv_one = get_textconv(one);
1622 textconv_two = get_textconv(two);
1623 }
1624
1625 diff_set_mnemonic_prefix(o, "a/", "b/");
1626 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1627 a_prefix = o->b_prefix;
1628 b_prefix = o->a_prefix;
1629 } else {
1630 a_prefix = o->a_prefix;
1631 b_prefix = o->b_prefix;
1632 }
1633
1634 /* Never use a non-valid filename anywhere if at all possible */
1635 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1636 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1637
1638 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1639 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1640 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1641 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1642 strbuf_addf(&header, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1643 if (lbl[0][0] == '/') {
1644 /* /dev/null */
1645 strbuf_addf(&header, "%snew file mode %06o%s\n", set, two->mode, reset);
1646 if (xfrm_msg && xfrm_msg[0])
1647 strbuf_addf(&header, "%s%s%s\n", set, xfrm_msg, reset);
1648 }
1649 else if (lbl[1][0] == '/') {
1650 strbuf_addf(&header, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1651 if (xfrm_msg && xfrm_msg[0])
1652 strbuf_addf(&header, "%s%s%s\n", set, xfrm_msg, reset);
1653 }
1654 else {
1655 if (one->mode != two->mode) {
1656 strbuf_addf(&header, "%sold mode %06o%s\n", set, one->mode, reset);
1657 strbuf_addf(&header, "%snew mode %06o%s\n", set, two->mode, reset);
1658 }
1659 if (xfrm_msg && xfrm_msg[0])
1660 strbuf_addf(&header, "%s%s%s\n", set, xfrm_msg, reset);
1661
1662 /*
1663 * we do not run diff between different kind
1664 * of objects.
1665 */
1666 if ((one->mode ^ two->mode) & S_IFMT)
1667 goto free_ab_and_return;
1668 if (complete_rewrite &&
1669 (textconv_one || !diff_filespec_is_binary(one)) &&
1670 (textconv_two || !diff_filespec_is_binary(two))) {
1671 fprintf(o->file, "%s", header.buf);
1672 strbuf_reset(&header);
1673 emit_rewrite_diff(name_a, name_b, one, two,
1674 textconv_one, textconv_two, o);
1675 o->found_changes = 1;
1676 goto free_ab_and_return;
1677 }
1678 }
1679
1680 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1681 die("unable to read files to diff");
1682
1683 if (!DIFF_OPT_TST(o, TEXT) &&
1684 ( (diff_filespec_is_binary(one) && !textconv_one) ||
1685 (diff_filespec_is_binary(two) && !textconv_two) )) {
1686 /* Quite common confusing case */
1687 if (mf1.size == mf2.size &&
1688 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1689 goto free_ab_and_return;
1690 fprintf(o->file, "%s", header.buf);
1691 strbuf_reset(&header);
1692 if (DIFF_OPT_TST(o, BINARY))
1693 emit_binary_diff(o->file, &mf1, &mf2);
1694 else
1695 fprintf(o->file, "Binary files %s and %s differ\n",
1696 lbl[0], lbl[1]);
1697 o->found_changes = 1;
1698 }
1699 else {
1700 /* Crazy xdl interfaces.. */
1701 const char *diffopts = getenv("GIT_DIFF_OPTS");
1702 xpparam_t xpp;
1703 xdemitconf_t xecfg;
1704 xdemitcb_t ecb;
1705 struct emit_callback ecbdata;
1706 const struct userdiff_funcname *pe;
1707
1708 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS)) {
1709 fprintf(o->file, "%s", header.buf);
1710 strbuf_reset(&header);
1711 }
1712
1713 if (textconv_one) {
1714 size_t size;
1715 mf1.ptr = run_textconv(textconv_one, one, &size);
1716 if (!mf1.ptr)
1717 die("unable to read files to diff");
1718 mf1.size = size;
1719 }
1720 if (textconv_two) {
1721 size_t size;
1722 mf2.ptr = run_textconv(textconv_two, two, &size);
1723 if (!mf2.ptr)
1724 die("unable to read files to diff");
1725 mf2.size = size;
1726 }
1727
1728 pe = diff_funcname_pattern(one);
1729 if (!pe)
1730 pe = diff_funcname_pattern(two);
1731
1732 memset(&xpp, 0, sizeof(xpp));
1733 memset(&xecfg, 0, sizeof(xecfg));
1734 memset(&ecbdata, 0, sizeof(ecbdata));
1735 ecbdata.label_path = lbl;
1736 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1737 ecbdata.found_changesp = &o->found_changes;
1738 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1739 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
1740 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1741 ecbdata.file = o->file;
1742 ecbdata.header = header.len ? &header : NULL;
1743 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1744 xecfg.ctxlen = o->context;
1745 xecfg.interhunkctxlen = o->interhunkcontext;
1746 xecfg.flags = XDL_EMIT_FUNCNAMES;
1747 if (pe)
1748 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1749 if (!diffopts)
1750 ;
1751 else if (!prefixcmp(diffopts, "--unified="))
1752 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1753 else if (!prefixcmp(diffopts, "-u"))
1754 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1755 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1756 ecbdata.diff_words =
1757 xcalloc(1, sizeof(struct diff_words_data));
1758 ecbdata.diff_words->file = o->file;
1759 if (!o->word_regex)
1760 o->word_regex = userdiff_word_regex(one);
1761 if (!o->word_regex)
1762 o->word_regex = userdiff_word_regex(two);
1763 if (!o->word_regex)
1764 o->word_regex = diff_word_regex_cfg;
1765 if (o->word_regex) {
1766 ecbdata.diff_words->word_regex = (regex_t *)
1767 xmalloc(sizeof(regex_t));
1768 if (regcomp(ecbdata.diff_words->word_regex,
1769 o->word_regex,
1770 REG_EXTENDED | REG_NEWLINE))
1771 die ("Invalid regular expression: %s",
1772 o->word_regex);
1773 }
1774 }
1775 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
1776 &xpp, &xecfg, &ecb);
1777 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1778 free_diff_words_data(&ecbdata);
1779 if (textconv_one)
1780 free(mf1.ptr);
1781 if (textconv_two)
1782 free(mf2.ptr);
1783 xdiff_clear_find_func(&xecfg);
1784 }
1785
1786 free_ab_and_return:
1787 strbuf_release(&header);
1788 diff_free_filespec_data(one);
1789 diff_free_filespec_data(two);
1790 free(a_one);
1791 free(b_two);
1792 return;
1793 }
1794
1795 static void builtin_diffstat(const char *name_a, const char *name_b,
1796 struct diff_filespec *one,
1797 struct diff_filespec *two,
1798 struct diffstat_t *diffstat,
1799 struct diff_options *o,
1800 int complete_rewrite)
1801 {
1802 mmfile_t mf1, mf2;
1803 struct diffstat_file *data;
1804
1805 data = diffstat_add(diffstat, name_a, name_b);
1806
1807 if (!one || !two) {
1808 data->is_unmerged = 1;
1809 return;
1810 }
1811 if (complete_rewrite) {
1812 diff_populate_filespec(one, 0);
1813 diff_populate_filespec(two, 0);
1814 data->deleted = count_lines(one->data, one->size);
1815 data->added = count_lines(two->data, two->size);
1816 goto free_and_return;
1817 }
1818 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1819 die("unable to read files to diff");
1820
1821 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1822 data->is_binary = 1;
1823 data->added = mf2.size;
1824 data->deleted = mf1.size;
1825 } else {
1826 /* Crazy xdl interfaces.. */
1827 xpparam_t xpp;
1828 xdemitconf_t xecfg;
1829 xdemitcb_t ecb;
1830
1831 memset(&xpp, 0, sizeof(xpp));
1832 memset(&xecfg, 0, sizeof(xecfg));
1833 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1834 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
1835 &xpp, &xecfg, &ecb);
1836 }
1837
1838 free_and_return:
1839 diff_free_filespec_data(one);
1840 diff_free_filespec_data(two);
1841 }
1842
1843 static void builtin_checkdiff(const char *name_a, const char *name_b,
1844 const char *attr_path,
1845 struct diff_filespec *one,
1846 struct diff_filespec *two,
1847 struct diff_options *o)
1848 {
1849 mmfile_t mf1, mf2;
1850 struct checkdiff_t data;
1851
1852 if (!two)
1853 return;
1854
1855 memset(&data, 0, sizeof(data));
1856 data.filename = name_b ? name_b : name_a;
1857 data.lineno = 0;
1858 data.o = o;
1859 data.ws_rule = whitespace_rule(attr_path);
1860 data.conflict_marker_size = ll_merge_marker_size(attr_path);
1861
1862 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1863 die("unable to read files to diff");
1864
1865 /*
1866 * All the other codepaths check both sides, but not checking
1867 * the "old" side here is deliberate. We are checking the newly
1868 * introduced changes, and as long as the "new" side is text, we
1869 * can and should check what it introduces.
1870 */
1871 if (diff_filespec_is_binary(two))
1872 goto free_and_return;
1873 else {
1874 /* Crazy xdl interfaces.. */
1875 xpparam_t xpp;
1876 xdemitconf_t xecfg;
1877 xdemitcb_t ecb;
1878
1879 memset(&xpp, 0, sizeof(xpp));
1880 memset(&xecfg, 0, sizeof(xecfg));
1881 xecfg.ctxlen = 1; /* at least one context line */
1882 xpp.flags = XDF_NEED_MINIMAL;
1883 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
1884 &xpp, &xecfg, &ecb);
1885
1886 if (data.ws_rule & WS_BLANK_AT_EOF) {
1887 struct emit_callback ecbdata;
1888 int blank_at_eof;
1889
1890 ecbdata.ws_rule = data.ws_rule;
1891 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1892 blank_at_eof = ecbdata.blank_at_eof_in_preimage;
1893
1894 if (blank_at_eof) {
1895 static char *err;
1896 if (!err)
1897 err = whitespace_error_string(WS_BLANK_AT_EOF);
1898 fprintf(o->file, "%s:%d: %s.\n",
1899 data.filename, blank_at_eof, err);
1900 data.status = 1; /* report errors */
1901 }
1902 }
1903 }
1904 free_and_return:
1905 diff_free_filespec_data(one);
1906 diff_free_filespec_data(two);
1907 if (data.status)
1908 DIFF_OPT_SET(o, CHECK_FAILED);
1909 }
1910
1911 struct diff_filespec *alloc_filespec(const char *path)
1912 {
1913 int namelen = strlen(path);
1914 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1915
1916 memset(spec, 0, sizeof(*spec));
1917 spec->path = (char *)(spec + 1);
1918 memcpy(spec->path, path, namelen+1);
1919 spec->count = 1;
1920 spec->is_binary = -1;
1921 return spec;
1922 }
1923
1924 void free_filespec(struct diff_filespec *spec)
1925 {
1926 if (!--spec->count) {
1927 diff_free_filespec_data(spec);
1928 free(spec);
1929 }
1930 }
1931
1932 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1933 unsigned short mode)
1934 {
1935 if (mode) {
1936 spec->mode = canon_mode(mode);
1937 hashcpy(spec->sha1, sha1);
1938 spec->sha1_valid = !is_null_sha1(sha1);
1939 }
1940 }
1941
1942 /*
1943 * Given a name and sha1 pair, if the index tells us the file in
1944 * the work tree has that object contents, return true, so that
1945 * prepare_temp_file() does not have to inflate and extract.
1946 */
1947 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1948 {
1949 struct cache_entry *ce;
1950 struct stat st;
1951 int pos, len;
1952
1953 /*
1954 * We do not read the cache ourselves here, because the
1955 * benchmark with my previous version that always reads cache
1956 * shows that it makes things worse for diff-tree comparing
1957 * two linux-2.6 kernel trees in an already checked out work
1958 * tree. This is because most diff-tree comparisons deal with
1959 * only a small number of files, while reading the cache is
1960 * expensive for a large project, and its cost outweighs the
1961 * savings we get by not inflating the object to a temporary
1962 * file. Practically, this code only helps when we are used
1963 * by diff-cache --cached, which does read the cache before
1964 * calling us.
1965 */
1966 if (!active_cache)
1967 return 0;
1968
1969 /* We want to avoid the working directory if our caller
1970 * doesn't need the data in a normal file, this system
1971 * is rather slow with its stat/open/mmap/close syscalls,
1972 * and the object is contained in a pack file. The pack
1973 * is probably already open and will be faster to obtain
1974 * the data through than the working directory. Loose
1975 * objects however would tend to be slower as they need
1976 * to be individually opened and inflated.
1977 */
1978 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
1979 return 0;
1980
1981 len = strlen(name);
1982 pos = cache_name_pos(name, len);
1983 if (pos < 0)
1984 return 0;
1985 ce = active_cache[pos];
1986
1987 /*
1988 * This is not the sha1 we are looking for, or
1989 * unreusable because it is not a regular file.
1990 */
1991 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1992 return 0;
1993
1994 /*
1995 * If ce is marked as "assume unchanged", there is no
1996 * guarantee that work tree matches what we are looking for.
1997 */
1998 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
1999 return 0;
2000
2001 /*
2002 * If ce matches the file in the work tree, we can reuse it.
2003 */
2004 if (ce_uptodate(ce) ||
2005 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2006 return 1;
2007
2008 return 0;
2009 }
2010
2011 static int populate_from_stdin(struct diff_filespec *s)
2012 {
2013 struct strbuf buf = STRBUF_INIT;
2014 size_t size = 0;
2015
2016 if (strbuf_read(&buf, 0, 0) < 0)
2017 return error("error while reading from stdin %s",
2018 strerror(errno));
2019
2020 s->should_munmap = 0;
2021 s->data = strbuf_detach(&buf, &size);
2022 s->size = size;
2023 s->should_free = 1;
2024 return 0;
2025 }
2026
2027 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2028 {
2029 int len;
2030 char *data = xmalloc(100), *dirty = "";
2031
2032 /* Are we looking at the work tree? */
2033 if (!s->sha1_valid && s->dirty_submodule)
2034 dirty = "-dirty";
2035
2036 len = snprintf(data, 100,
2037 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2038 s->data = data;
2039 s->size = len;
2040 s->should_free = 1;
2041 if (size_only) {
2042 s->data = NULL;
2043 free(data);
2044 }
2045 return 0;
2046 }
2047
2048 /*
2049 * While doing rename detection and pickaxe operation, we may need to
2050 * grab the data for the blob (or file) for our own in-core comparison.
2051 * diff_filespec has data and size fields for this purpose.
2052 */
2053 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2054 {
2055 int err = 0;
2056 if (!DIFF_FILE_VALID(s))
2057 die("internal error: asking to populate invalid file.");
2058 if (S_ISDIR(s->mode))
2059 return -1;
2060
2061 if (s->data)
2062 return 0;
2063
2064 if (size_only && 0 < s->size)
2065 return 0;
2066
2067 if (S_ISGITLINK(s->mode))
2068 return diff_populate_gitlink(s, size_only);
2069
2070 if (!s->sha1_valid ||
2071 reuse_worktree_file(s->path, s->sha1, 0)) {
2072 struct strbuf buf = STRBUF_INIT;
2073 struct stat st;
2074 int fd;
2075
2076 if (!strcmp(s->path, "-"))
2077 return populate_from_stdin(s);
2078
2079 if (lstat(s->path, &st) < 0) {
2080 if (errno == ENOENT) {
2081 err_empty:
2082 err = -1;
2083 empty:
2084 s->data = (char *)"";
2085 s->size = 0;
2086 return err;
2087 }
2088 }
2089 s->size = xsize_t(st.st_size);
2090 if (!s->size)
2091 goto empty;
2092 if (S_ISLNK(st.st_mode)) {
2093 struct strbuf sb = STRBUF_INIT;
2094
2095 if (strbuf_readlink(&sb, s->path, s->size))
2096 goto err_empty;
2097 s->size = sb.len;
2098 s->data = strbuf_detach(&sb, NULL);
2099 s->should_free = 1;
2100 return 0;
2101 }
2102 if (size_only)
2103 return 0;
2104 fd = open(s->path, O_RDONLY);
2105 if (fd < 0)
2106 goto err_empty;
2107 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2108 close(fd);
2109 s->should_munmap = 1;
2110
2111 /*
2112 * Convert from working tree format to canonical git format
2113 */
2114 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2115 size_t size = 0;
2116 munmap(s->data, s->size);
2117 s->should_munmap = 0;
2118 s->data = strbuf_detach(&buf, &size);
2119 s->size = size;
2120 s->should_free = 1;
2121 }
2122 }
2123 else {
2124 enum object_type type;
2125 if (size_only)
2126 type = sha1_object_info(s->sha1, &s->size);
2127 else {
2128 s->data = read_sha1_file(s->sha1, &type, &s->size);
2129 s->should_free = 1;
2130 }
2131 }
2132 return 0;
2133 }
2134
2135 void diff_free_filespec_blob(struct diff_filespec *s)
2136 {
2137 if (s->should_free)
2138 free(s->data);
2139 else if (s->should_munmap)
2140 munmap(s->data, s->size);
2141
2142 if (s->should_free || s->should_munmap) {
2143 s->should_free = s->should_munmap = 0;
2144 s->data = NULL;
2145 }
2146 }
2147
2148 void diff_free_filespec_data(struct diff_filespec *s)
2149 {
2150 diff_free_filespec_blob(s);
2151 free(s->cnt_data);
2152 s->cnt_data = NULL;
2153 }
2154
2155 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2156 void *blob,
2157 unsigned long size,
2158 const unsigned char *sha1,
2159 int mode)
2160 {
2161 int fd;
2162 struct strbuf buf = STRBUF_INIT;
2163 struct strbuf template = STRBUF_INIT;
2164 char *path_dup = xstrdup(path);
2165 const char *base = basename(path_dup);
2166
2167 /* Generate "XXXXXX_basename.ext" */
2168 strbuf_addstr(&template, "XXXXXX_");
2169 strbuf_addstr(&template, base);
2170
2171 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2172 strlen(base) + 1);
2173 if (fd < 0)
2174 die_errno("unable to create temp-file");
2175 if (convert_to_working_tree(path,
2176 (const char *)blob, (size_t)size, &buf)) {
2177 blob = buf.buf;
2178 size = buf.len;
2179 }
2180 if (write_in_full(fd, blob, size) != size)
2181 die_errno("unable to write temp-file");
2182 close(fd);
2183 temp->name = temp->tmp_path;
2184 strcpy(temp->hex, sha1_to_hex(sha1));
2185 temp->hex[40] = 0;
2186 sprintf(temp->mode, "%06o", mode);
2187 strbuf_release(&buf);
2188 strbuf_release(&template);
2189 free(path_dup);
2190 }
2191
2192 static struct diff_tempfile *prepare_temp_file(const char *name,
2193 struct diff_filespec *one)
2194 {
2195 struct diff_tempfile *temp = claim_diff_tempfile();
2196
2197 if (!DIFF_FILE_VALID(one)) {
2198 not_a_valid_file:
2199 /* A '-' entry produces this for file-2, and
2200 * a '+' entry produces this for file-1.
2201 */
2202 temp->name = "/dev/null";
2203 strcpy(temp->hex, ".");
2204 strcpy(temp->mode, ".");
2205 return temp;
2206 }
2207
2208 if (!remove_tempfile_installed) {
2209 atexit(remove_tempfile);
2210 sigchain_push_common(remove_tempfile_on_signal);
2211 remove_tempfile_installed = 1;
2212 }
2213
2214 if (!one->sha1_valid ||
2215 reuse_worktree_file(name, one->sha1, 1)) {
2216 struct stat st;
2217 if (lstat(name, &st) < 0) {
2218 if (errno == ENOENT)
2219 goto not_a_valid_file;
2220 die_errno("stat(%s)", name);
2221 }
2222 if (S_ISLNK(st.st_mode)) {
2223 struct strbuf sb = STRBUF_INIT;
2224 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2225 die_errno("readlink(%s)", name);
2226 prep_temp_blob(name, temp, sb.buf, sb.len,
2227 (one->sha1_valid ?
2228 one->sha1 : null_sha1),
2229 (one->sha1_valid ?
2230 one->mode : S_IFLNK));
2231 strbuf_release(&sb);
2232 }
2233 else {
2234 /* we can borrow from the file in the work tree */
2235 temp->name = name;
2236 if (!one->sha1_valid)
2237 strcpy(temp->hex, sha1_to_hex(null_sha1));
2238 else
2239 strcpy(temp->hex, sha1_to_hex(one->sha1));
2240 /* Even though we may sometimes borrow the
2241 * contents from the work tree, we always want
2242 * one->mode. mode is trustworthy even when
2243 * !(one->sha1_valid), as long as
2244 * DIFF_FILE_VALID(one).
2245 */
2246 sprintf(temp->mode, "%06o", one->mode);
2247 }
2248 return temp;
2249 }
2250 else {
2251 if (diff_populate_filespec(one, 0))
2252 die("cannot read data blob for %s", one->path);
2253 prep_temp_blob(name, temp, one->data, one->size,
2254 one->sha1, one->mode);
2255 }
2256 return temp;
2257 }
2258
2259 /* An external diff command takes:
2260 *
2261 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2262 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2263 *
2264 */
2265 static void run_external_diff(const char *pgm,
2266 const char *name,
2267 const char *other,
2268 struct diff_filespec *one,
2269 struct diff_filespec *two,
2270 const char *xfrm_msg,
2271 int complete_rewrite)
2272 {
2273 const char *spawn_arg[10];
2274 int retval;
2275 const char **arg = &spawn_arg[0];
2276
2277 if (one && two) {
2278 struct diff_tempfile *temp_one, *temp_two;
2279 const char *othername = (other ? other : name);
2280 temp_one = prepare_temp_file(name, one);
2281 temp_two = prepare_temp_file(othername, two);
2282 *arg++ = pgm;
2283 *arg++ = name;
2284 *arg++ = temp_one->name;
2285 *arg++ = temp_one->hex;
2286 *arg++ = temp_one->mode;
2287 *arg++ = temp_two->name;
2288 *arg++ = temp_two->hex;
2289 *arg++ = temp_two->mode;
2290 if (other) {
2291 *arg++ = other;
2292 *arg++ = xfrm_msg;
2293 }
2294 } else {
2295 *arg++ = pgm;
2296 *arg++ = name;
2297 }
2298 *arg = NULL;
2299 fflush(NULL);
2300 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2301 remove_tempfile();
2302 if (retval) {
2303 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2304 exit(1);
2305 }
2306 }
2307
2308 static int similarity_index(struct diff_filepair *p)
2309 {
2310 return p->score * 100 / MAX_SCORE;
2311 }
2312
2313 static void fill_metainfo(struct strbuf *msg,
2314 const char *name,
2315 const char *other,
2316 struct diff_filespec *one,
2317 struct diff_filespec *two,
2318 struct diff_options *o,
2319 struct diff_filepair *p)
2320 {
2321 strbuf_init(msg, PATH_MAX * 2 + 300);
2322 switch (p->status) {
2323 case DIFF_STATUS_COPIED:
2324 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2325 strbuf_addstr(msg, "\ncopy from ");
2326 quote_c_style(name, msg, NULL, 0);
2327 strbuf_addstr(msg, "\ncopy to ");
2328 quote_c_style(other, msg, NULL, 0);
2329 strbuf_addch(msg, '\n');
2330 break;
2331 case DIFF_STATUS_RENAMED:
2332 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2333 strbuf_addstr(msg, "\nrename from ");
2334 quote_c_style(name, msg, NULL, 0);
2335 strbuf_addstr(msg, "\nrename to ");
2336 quote_c_style(other, msg, NULL, 0);
2337 strbuf_addch(msg, '\n');
2338 break;
2339 case DIFF_STATUS_MODIFIED:
2340 if (p->score) {
2341 strbuf_addf(msg, "dissimilarity index %d%%\n",
2342 similarity_index(p));
2343 break;
2344 }
2345 /* fallthru */
2346 default:
2347 /* nothing */
2348 ;
2349 }
2350 if (one && two && hashcmp(one->sha1, two->sha1)) {
2351 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2352
2353 if (DIFF_OPT_TST(o, BINARY)) {
2354 mmfile_t mf;
2355 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2356 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2357 abbrev = 40;
2358 }
2359 strbuf_addf(msg, "index %.*s..%.*s",
2360 abbrev, sha1_to_hex(one->sha1),
2361 abbrev, sha1_to_hex(two->sha1));
2362 if (one->mode == two->mode)
2363 strbuf_addf(msg, " %06o", one->mode);
2364 strbuf_addch(msg, '\n');
2365 }
2366 if (msg->len)
2367 strbuf_setlen(msg, msg->len - 1);
2368 }
2369
2370 static void run_diff_cmd(const char *pgm,
2371 const char *name,
2372 const char *other,
2373 const char *attr_path,
2374 struct diff_filespec *one,
2375 struct diff_filespec *two,
2376 struct strbuf *msg,
2377 struct diff_options *o,
2378 struct diff_filepair *p)
2379 {
2380 const char *xfrm_msg = NULL;
2381 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2382
2383 if (msg) {
2384 fill_metainfo(msg, name, other, one, two, o, p);
2385 xfrm_msg = msg->len ? msg->buf : NULL;
2386 }
2387
2388 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2389 pgm = NULL;
2390 else {
2391 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2392 if (drv && drv->external)
2393 pgm = drv->external;
2394 }
2395
2396 if (pgm) {
2397 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2398 complete_rewrite);
2399 return;
2400 }
2401 if (one && two)
2402 builtin_diff(name, other ? other : name,
2403 one, two, xfrm_msg, o, complete_rewrite);
2404 else
2405 fprintf(o->file, "* Unmerged path %s\n", name);
2406 }
2407
2408 static void diff_fill_sha1_info(struct diff_filespec *one)
2409 {
2410 if (DIFF_FILE_VALID(one)) {
2411 if (!one->sha1_valid) {
2412 struct stat st;
2413 if (!strcmp(one->path, "-")) {
2414 hashcpy(one->sha1, null_sha1);
2415 return;
2416 }
2417 if (lstat(one->path, &st) < 0)
2418 die_errno("stat '%s'", one->path);
2419 if (index_path(one->sha1, one->path, &st, 0))
2420 die("cannot hash %s", one->path);
2421 }
2422 }
2423 else
2424 hashclr(one->sha1);
2425 }
2426
2427 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2428 {
2429 /* Strip the prefix but do not molest /dev/null and absolute paths */
2430 if (*namep && **namep != '/')
2431 *namep += prefix_length;
2432 if (*otherp && **otherp != '/')
2433 *otherp += prefix_length;
2434 }
2435
2436 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2437 {
2438 const char *pgm = external_diff();
2439 struct strbuf msg;
2440 struct diff_filespec *one = p->one;
2441 struct diff_filespec *two = p->two;
2442 const char *name;
2443 const char *other;
2444 const char *attr_path;
2445
2446 name = p->one->path;
2447 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2448 attr_path = name;
2449 if (o->prefix_length)
2450 strip_prefix(o->prefix_length, &name, &other);
2451
2452 if (DIFF_PAIR_UNMERGED(p)) {
2453 run_diff_cmd(pgm, name, NULL, attr_path,
2454 NULL, NULL, NULL, o, p);
2455 return;
2456 }
2457
2458 diff_fill_sha1_info(one);
2459 diff_fill_sha1_info(two);
2460
2461 if (!pgm &&
2462 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2463 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2464 /*
2465 * a filepair that changes between file and symlink
2466 * needs to be split into deletion and creation.
2467 */
2468 struct diff_filespec *null = alloc_filespec(two->path);
2469 run_diff_cmd(NULL, name, other, attr_path,
2470 one, null, &msg, o, p);
2471 free(null);
2472 strbuf_release(&msg);
2473
2474 null = alloc_filespec(one->path);
2475 run_diff_cmd(NULL, name, other, attr_path,
2476 null, two, &msg, o, p);
2477 free(null);
2478 }
2479 else
2480 run_diff_cmd(pgm, name, other, attr_path,
2481 one, two, &msg, o, p);
2482
2483 strbuf_release(&msg);
2484 }
2485
2486 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2487 struct diffstat_t *diffstat)
2488 {
2489 const char *name;
2490 const char *other;
2491 int complete_rewrite = 0;
2492
2493 if (DIFF_PAIR_UNMERGED(p)) {
2494 /* unmerged */
2495 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2496 return;
2497 }
2498
2499 name = p->one->path;
2500 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2501
2502 if (o->prefix_length)
2503 strip_prefix(o->prefix_length, &name, &other);
2504
2505 diff_fill_sha1_info(p->one);
2506 diff_fill_sha1_info(p->two);
2507
2508 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2509 complete_rewrite = 1;
2510 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2511 }
2512
2513 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2514 {
2515 const char *name;
2516 const char *other;
2517 const char *attr_path;
2518
2519 if (DIFF_PAIR_UNMERGED(p)) {
2520 /* unmerged */
2521 return;
2522 }
2523
2524 name = p->one->path;
2525 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2526 attr_path = other ? other : name;
2527
2528 if (o->prefix_length)
2529 strip_prefix(o->prefix_length, &name, &other);
2530
2531 diff_fill_sha1_info(p->one);
2532 diff_fill_sha1_info(p->two);
2533
2534 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2535 }
2536
2537 void diff_setup(struct diff_options *options)
2538 {
2539 memset(options, 0, sizeof(*options));
2540
2541 options->file = stdout;
2542
2543 options->line_termination = '\n';
2544 options->break_opt = -1;
2545 options->rename_limit = -1;
2546 options->dirstat_percent = 3;
2547 options->context = 3;
2548
2549 options->change = diff_change;
2550 options->add_remove = diff_addremove;
2551 if (diff_use_color_default > 0)
2552 DIFF_OPT_SET(options, COLOR_DIFF);
2553 options->detect_rename = diff_detect_rename_default;
2554
2555 if (!diff_mnemonic_prefix) {
2556 options->a_prefix = "a/";
2557 options->b_prefix = "b/";
2558 }
2559 }
2560
2561 int diff_setup_done(struct diff_options *options)
2562 {
2563 int count = 0;
2564
2565 if (options->output_format & DIFF_FORMAT_NAME)
2566 count++;
2567 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2568 count++;
2569 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2570 count++;
2571 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2572 count++;
2573 if (count > 1)
2574 die("--name-only, --name-status, --check and -s are mutually exclusive");
2575
2576 /*
2577 * Most of the time we can say "there are changes"
2578 * only by checking if there are changed paths, but
2579 * --ignore-whitespace* options force us to look
2580 * inside contents.
2581 */
2582
2583 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
2584 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
2585 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
2586 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
2587 else
2588 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
2589
2590 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2591 options->detect_rename = DIFF_DETECT_COPY;
2592
2593 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2594 options->prefix = NULL;
2595 if (options->prefix)
2596 options->prefix_length = strlen(options->prefix);
2597 else
2598 options->prefix_length = 0;
2599
2600 if (options->output_format & (DIFF_FORMAT_NAME |
2601 DIFF_FORMAT_NAME_STATUS |
2602 DIFF_FORMAT_CHECKDIFF |
2603 DIFF_FORMAT_NO_OUTPUT))
2604 options->output_format &= ~(DIFF_FORMAT_RAW |
2605 DIFF_FORMAT_NUMSTAT |
2606 DIFF_FORMAT_DIFFSTAT |
2607 DIFF_FORMAT_SHORTSTAT |
2608 DIFF_FORMAT_DIRSTAT |
2609 DIFF_FORMAT_SUMMARY |
2610 DIFF_FORMAT_PATCH);
2611
2612 /*
2613 * These cases always need recursive; we do not drop caller-supplied
2614 * recursive bits for other formats here.
2615 */
2616 if (options->output_format & (DIFF_FORMAT_PATCH |
2617 DIFF_FORMAT_NUMSTAT |
2618 DIFF_FORMAT_DIFFSTAT |
2619 DIFF_FORMAT_SHORTSTAT |
2620 DIFF_FORMAT_DIRSTAT |
2621 DIFF_FORMAT_SUMMARY |
2622 DIFF_FORMAT_CHECKDIFF))
2623 DIFF_OPT_SET(options, RECURSIVE);
2624 /*
2625 * Also pickaxe would not work very well if you do not say recursive
2626 */
2627 if (options->pickaxe)
2628 DIFF_OPT_SET(options, RECURSIVE);
2629
2630 if (options->detect_rename && options->rename_limit < 0)
2631 options->rename_limit = diff_rename_limit_default;
2632 if (options->setup & DIFF_SETUP_USE_CACHE) {
2633 if (!active_cache)
2634 /* read-cache does not die even when it fails
2635 * so it is safe for us to do this here. Also
2636 * it does not smudge active_cache or active_nr
2637 * when it fails, so we do not have to worry about
2638 * cleaning it up ourselves either.
2639 */
2640 read_cache();
2641 }
2642 if (options->abbrev <= 0 || 40 < options->abbrev)
2643 options->abbrev = 40; /* full */
2644
2645 /*
2646 * It does not make sense to show the first hit we happened
2647 * to have found. It does not make sense not to return with
2648 * exit code in such a case either.
2649 */
2650 if (DIFF_OPT_TST(options, QUICK)) {
2651 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2652 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2653 }
2654
2655 return 0;
2656 }
2657
2658 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2659 {
2660 char c, *eq;
2661 int len;
2662
2663 if (*arg != '-')
2664 return 0;
2665 c = *++arg;
2666 if (!c)
2667 return 0;
2668 if (c == arg_short) {
2669 c = *++arg;
2670 if (!c)
2671 return 1;
2672 if (val && isdigit(c)) {
2673 char *end;
2674 int n = strtoul(arg, &end, 10);
2675 if (*end)
2676 return 0;
2677 *val = n;
2678 return 1;
2679 }
2680 return 0;
2681 }
2682 if (c != '-')
2683 return 0;
2684 arg++;
2685 eq = strchr(arg, '=');
2686 if (eq)
2687 len = eq - arg;
2688 else
2689 len = strlen(arg);
2690 if (!len || strncmp(arg, arg_long, len))
2691 return 0;
2692 if (eq) {
2693 int n;
2694 char *end;
2695 if (!isdigit(*++eq))
2696 return 0;
2697 n = strtoul(eq, &end, 10);
2698 if (*end)
2699 return 0;
2700 *val = n;
2701 }
2702 return 1;
2703 }
2704
2705 static int diff_scoreopt_parse(const char *opt);
2706
2707 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2708 {
2709 const char *arg = av[0];
2710
2711 /* Output format options */
2712 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2713 options->output_format |= DIFF_FORMAT_PATCH;
2714 else if (opt_arg(arg, 'U', "unified", &options->context))
2715 options->output_format |= DIFF_FORMAT_PATCH;
2716 else if (!strcmp(arg, "--raw"))
2717 options->output_format |= DIFF_FORMAT_RAW;
2718 else if (!strcmp(arg, "--patch-with-raw"))
2719 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2720 else if (!strcmp(arg, "--numstat"))
2721 options->output_format |= DIFF_FORMAT_NUMSTAT;
2722 else if (!strcmp(arg, "--shortstat"))
2723 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2724 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2725 options->output_format |= DIFF_FORMAT_DIRSTAT;
2726 else if (!strcmp(arg, "--cumulative")) {
2727 options->output_format |= DIFF_FORMAT_DIRSTAT;
2728 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
2729 } else if (opt_arg(arg, 0, "dirstat-by-file",
2730 &options->dirstat_percent)) {
2731 options->output_format |= DIFF_FORMAT_DIRSTAT;
2732 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
2733 }
2734 else if (!strcmp(arg, "--check"))
2735 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2736 else if (!strcmp(arg, "--summary"))
2737 options->output_format |= DIFF_FORMAT_SUMMARY;
2738 else if (!strcmp(arg, "--patch-with-stat"))
2739 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2740 else if (!strcmp(arg, "--name-only"))
2741 options->output_format |= DIFF_FORMAT_NAME;
2742 else if (!strcmp(arg, "--name-status"))
2743 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2744 else if (!strcmp(arg, "-s"))
2745 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2746 else if (!prefixcmp(arg, "--stat")) {
2747 char *end;
2748 int width = options->stat_width;
2749 int name_width = options->stat_name_width;
2750 arg += 6;
2751 end = (char *)arg;
2752
2753 switch (*arg) {
2754 case '-':
2755 if (!prefixcmp(arg, "-width="))
2756 width = strtoul(arg + 7, &end, 10);
2757 else if (!prefixcmp(arg, "-name-width="))
2758 name_width = strtoul(arg + 12, &end, 10);
2759 break;
2760 case '=':
2761 width = strtoul(arg+1, &end, 10);
2762 if (*end == ',')
2763 name_width = strtoul(end+1, &end, 10);
2764 }
2765
2766 /* Important! This checks all the error cases! */
2767 if (*end)
2768 return 0;
2769 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2770 options->stat_name_width = name_width;
2771 options->stat_width = width;
2772 }
2773
2774 /* renames options */
2775 else if (!prefixcmp(arg, "-B")) {
2776 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2777 return -1;
2778 }
2779 else if (!prefixcmp(arg, "-M")) {
2780 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2781 return -1;
2782 options->detect_rename = DIFF_DETECT_RENAME;
2783 }
2784 else if (!prefixcmp(arg, "-C")) {
2785 if (options->detect_rename == DIFF_DETECT_COPY)
2786 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2787 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2788 return -1;
2789 options->detect_rename = DIFF_DETECT_COPY;
2790 }
2791 else if (!strcmp(arg, "--no-renames"))
2792 options->detect_rename = 0;
2793 else if (!strcmp(arg, "--relative"))
2794 DIFF_OPT_SET(options, RELATIVE_NAME);
2795 else if (!prefixcmp(arg, "--relative=")) {
2796 DIFF_OPT_SET(options, RELATIVE_NAME);
2797 options->prefix = arg + 11;
2798 }
2799
2800 /* xdiff options */
2801 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2802 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
2803 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2804 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
2805 else if (!strcmp(arg, "--ignore-space-at-eol"))
2806 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
2807 else if (!strcmp(arg, "--patience"))
2808 DIFF_XDL_SET(options, PATIENCE_DIFF);
2809
2810 /* flags options */
2811 else if (!strcmp(arg, "--binary")) {
2812 options->output_format |= DIFF_FORMAT_PATCH;
2813 DIFF_OPT_SET(options, BINARY);
2814 }
2815 else if (!strcmp(arg, "--full-index"))
2816 DIFF_OPT_SET(options, FULL_INDEX);
2817 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2818 DIFF_OPT_SET(options, TEXT);
2819 else if (!strcmp(arg, "-R"))
2820 DIFF_OPT_SET(options, REVERSE_DIFF);
2821 else if (!strcmp(arg, "--find-copies-harder"))
2822 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2823 else if (!strcmp(arg, "--follow"))
2824 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2825 else if (!strcmp(arg, "--color"))
2826 DIFF_OPT_SET(options, COLOR_DIFF);
2827 else if (!strcmp(arg, "--no-color"))
2828 DIFF_OPT_CLR(options, COLOR_DIFF);
2829 else if (!strcmp(arg, "--color-words")) {
2830 DIFF_OPT_SET(options, COLOR_DIFF);
2831 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2832 }
2833 else if (!prefixcmp(arg, "--color-words=")) {
2834 DIFF_OPT_SET(options, COLOR_DIFF);
2835 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2836 options->word_regex = arg + 14;
2837 }
2838 else if (!strcmp(arg, "--exit-code"))
2839 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2840 else if (!strcmp(arg, "--quiet"))
2841 DIFF_OPT_SET(options, QUICK);
2842 else if (!strcmp(arg, "--ext-diff"))
2843 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2844 else if (!strcmp(arg, "--no-ext-diff"))
2845 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2846 else if (!strcmp(arg, "--textconv"))
2847 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
2848 else if (!strcmp(arg, "--no-textconv"))
2849 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
2850 else if (!strcmp(arg, "--ignore-submodules"))
2851 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2852 else if (!strcmp(arg, "--submodule"))
2853 DIFF_OPT_SET(options, SUBMODULE_LOG);
2854 else if (!prefixcmp(arg, "--submodule=")) {
2855 if (!strcmp(arg + 12, "log"))
2856 DIFF_OPT_SET(options, SUBMODULE_LOG);
2857 }
2858
2859 /* misc options */
2860 else if (!strcmp(arg, "-z"))
2861 options->line_termination = 0;
2862 else if (!prefixcmp(arg, "-l"))
2863 options->rename_limit = strtoul(arg+2, NULL, 10);
2864 else if (!prefixcmp(arg, "-S"))
2865 options->pickaxe = arg + 2;
2866 else if (!strcmp(arg, "--pickaxe-all"))
2867 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2868 else if (!strcmp(arg, "--pickaxe-regex"))
2869 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2870 else if (!prefixcmp(arg, "-O"))
2871 options->orderfile = arg + 2;
2872 else if (!prefixcmp(arg, "--diff-filter="))
2873 options->filter = arg + 14;
2874 else if (!strcmp(arg, "--abbrev"))
2875 options->abbrev = DEFAULT_ABBREV;
2876 else if (!prefixcmp(arg, "--abbrev=")) {
2877 options->abbrev = strtoul(arg + 9, NULL, 10);
2878 if (options->abbrev < MINIMUM_ABBREV)
2879 options->abbrev = MINIMUM_ABBREV;
2880 else if (40 < options->abbrev)
2881 options->abbrev = 40;
2882 }
2883 else if (!prefixcmp(arg, "--src-prefix="))
2884 options->a_prefix = arg + 13;
2885 else if (!prefixcmp(arg, "--dst-prefix="))
2886 options->b_prefix = arg + 13;
2887 else if (!strcmp(arg, "--no-prefix"))
2888 options->a_prefix = options->b_prefix = "";
2889 else if (opt_arg(arg, '\0', "inter-hunk-context",
2890 &options->interhunkcontext))
2891 ;
2892 else if (!prefixcmp(arg, "--output=")) {
2893 options->file = fopen(arg + strlen("--output="), "w");
2894 if (!options->file)
2895 die_errno("Could not open '%s'", arg + strlen("--output="));
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_NO_OUTPUT &&
3524 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
3525 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
3526 /*
3527 * run diff_flush_patch for the exit status. setting
3528 * options->file to /dev/null should be safe, becaue we
3529 * aren't supposed to produce any output anyway.
3530 */
3531 if (options->close_file)
3532 fclose(options->file);
3533 options->file = fopen("/dev/null", "w");
3534 if (!options->file)
3535 die_errno("Could not open /dev/null");
3536 options->close_file = 1;
3537 for (i = 0; i < q->nr; i++) {
3538 struct diff_filepair *p = q->queue[i];
3539 if (check_pair_status(p))
3540 diff_flush_patch(p, options);
3541 if (options->found_changes)
3542 break;
3543 }
3544 }
3545
3546 if (output_format & DIFF_FORMAT_PATCH) {
3547 if (separator) {
3548 putc(options->line_termination, options->file);
3549 if (options->stat_sep) {
3550 /* attach patch instead of inline */
3551 fputs(options->stat_sep, options->file);
3552 }
3553 }
3554
3555 for (i = 0; i < q->nr; i++) {
3556 struct diff_filepair *p = q->queue[i];
3557 if (check_pair_status(p))
3558 diff_flush_patch(p, options);
3559 }
3560 }
3561
3562 if (output_format & DIFF_FORMAT_CALLBACK)
3563 options->format_callback(q, options, options->format_callback_data);
3564
3565 for (i = 0; i < q->nr; i++)
3566 diff_free_filepair(q->queue[i]);
3567 free_queue:
3568 free(q->queue);
3569 q->queue = NULL;
3570 q->nr = q->alloc = 0;
3571 if (options->close_file)
3572 fclose(options->file);
3573
3574 /*
3575 * Report the content-level differences with HAS_CHANGES;
3576 * diff_addremove/diff_change does not set the bit when
3577 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
3578 */
3579 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
3580 if (options->found_changes)
3581 DIFF_OPT_SET(options, HAS_CHANGES);
3582 else
3583 DIFF_OPT_CLR(options, HAS_CHANGES);
3584 }
3585 }
3586
3587 static void diffcore_apply_filter(const char *filter)
3588 {
3589 int i;
3590 struct diff_queue_struct *q = &diff_queued_diff;
3591 struct diff_queue_struct outq;
3592 outq.queue = NULL;
3593 outq.nr = outq.alloc = 0;
3594
3595 if (!filter)
3596 return;
3597
3598 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3599 int found;
3600 for (i = found = 0; !found && i < q->nr; i++) {
3601 struct diff_filepair *p = q->queue[i];
3602 if (((p->status == DIFF_STATUS_MODIFIED) &&
3603 ((p->score &&
3604 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3605 (!p->score &&
3606 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3607 ((p->status != DIFF_STATUS_MODIFIED) &&
3608 strchr(filter, p->status)))
3609 found++;
3610 }
3611 if (found)
3612 return;
3613
3614 /* otherwise we will clear the whole queue
3615 * by copying the empty outq at the end of this
3616 * function, but first clear the current entries
3617 * in the queue.
3618 */
3619 for (i = 0; i < q->nr; i++)
3620 diff_free_filepair(q->queue[i]);
3621 }
3622 else {
3623 /* Only the matching ones */
3624 for (i = 0; i < q->nr; i++) {
3625 struct diff_filepair *p = q->queue[i];
3626
3627 if (((p->status == DIFF_STATUS_MODIFIED) &&
3628 ((p->score &&
3629 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3630 (!p->score &&
3631 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3632 ((p->status != DIFF_STATUS_MODIFIED) &&
3633 strchr(filter, p->status)))
3634 diff_q(&outq, p);
3635 else
3636 diff_free_filepair(p);
3637 }
3638 }
3639 free(q->queue);
3640 *q = outq;
3641 }
3642
3643 /* Check whether two filespecs with the same mode and size are identical */
3644 static int diff_filespec_is_identical(struct diff_filespec *one,
3645 struct diff_filespec *two)
3646 {
3647 if (S_ISGITLINK(one->mode))
3648 return 0;
3649 if (diff_populate_filespec(one, 0))
3650 return 0;
3651 if (diff_populate_filespec(two, 0))
3652 return 0;
3653 return !memcmp(one->data, two->data, one->size);
3654 }
3655
3656 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3657 {
3658 int i;
3659 struct diff_queue_struct *q = &diff_queued_diff;
3660 struct diff_queue_struct outq;
3661 outq.queue = NULL;
3662 outq.nr = outq.alloc = 0;
3663
3664 for (i = 0; i < q->nr; i++) {
3665 struct diff_filepair *p = q->queue[i];
3666
3667 /*
3668 * 1. Entries that come from stat info dirtiness
3669 * always have both sides (iow, not create/delete),
3670 * one side of the object name is unknown, with
3671 * the same mode and size. Keep the ones that
3672 * do not match these criteria. They have real
3673 * differences.
3674 *
3675 * 2. At this point, the file is known to be modified,
3676 * with the same mode and size, and the object
3677 * name of one side is unknown. Need to inspect
3678 * the identical contents.
3679 */
3680 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3681 !DIFF_FILE_VALID(p->two) ||
3682 (p->one->sha1_valid && p->two->sha1_valid) ||
3683 (p->one->mode != p->two->mode) ||
3684 diff_populate_filespec(p->one, 1) ||
3685 diff_populate_filespec(p->two, 1) ||
3686 (p->one->size != p->two->size) ||
3687 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3688 diff_q(&outq, p);
3689 else {
3690 /*
3691 * The caller can subtract 1 from skip_stat_unmatch
3692 * to determine how many paths were dirty only
3693 * due to stat info mismatch.
3694 */
3695 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3696 diffopt->skip_stat_unmatch++;
3697 diff_free_filepair(p);
3698 }
3699 }
3700 free(q->queue);
3701 *q = outq;
3702 }
3703
3704 static int diffnamecmp(const void *a_, const void *b_)
3705 {
3706 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
3707 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
3708 const char *name_a, *name_b;
3709
3710 name_a = a->one ? a->one->path : a->two->path;
3711 name_b = b->one ? b->one->path : b->two->path;
3712 return strcmp(name_a, name_b);
3713 }
3714
3715 void diffcore_fix_diff_index(struct diff_options *options)
3716 {
3717 struct diff_queue_struct *q = &diff_queued_diff;
3718 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
3719 }
3720
3721 void diffcore_std(struct diff_options *options)
3722 {
3723 if (options->skip_stat_unmatch)
3724 diffcore_skip_stat_unmatch(options);
3725 if (options->break_opt != -1)
3726 diffcore_break(options->break_opt);
3727 if (options->detect_rename)
3728 diffcore_rename(options);
3729 if (options->break_opt != -1)
3730 diffcore_merge_broken();
3731 if (options->pickaxe)
3732 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3733 if (options->orderfile)
3734 diffcore_order(options->orderfile);
3735 diff_resolve_rename_copy();
3736 diffcore_apply_filter(options->filter);
3737
3738 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
3739 DIFF_OPT_SET(options, HAS_CHANGES);
3740 else
3741 DIFF_OPT_CLR(options, HAS_CHANGES);
3742 }
3743
3744 int diff_result_code(struct diff_options *opt, int status)
3745 {
3746 int result = 0;
3747 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3748 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3749 return status;
3750 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3751 DIFF_OPT_TST(opt, HAS_CHANGES))
3752 result |= 01;
3753 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3754 DIFF_OPT_TST(opt, CHECK_FAILED))
3755 result |= 02;
3756 return result;
3757 }
3758
3759 void diff_addremove(struct diff_options *options,
3760 int addremove, unsigned mode,
3761 const unsigned char *sha1,
3762 const char *concatpath, unsigned dirty_submodule)
3763 {
3764 struct diff_filespec *one, *two;
3765
3766 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3767 return;
3768
3769 /* This may look odd, but it is a preparation for
3770 * feeding "there are unchanged files which should
3771 * not produce diffs, but when you are doing copy
3772 * detection you would need them, so here they are"
3773 * entries to the diff-core. They will be prefixed
3774 * with something like '=' or '*' (I haven't decided
3775 * which but should not make any difference).
3776 * Feeding the same new and old to diff_change()
3777 * also has the same effect.
3778 * Before the final output happens, they are pruned after
3779 * merged into rename/copy pairs as appropriate.
3780 */
3781 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3782 addremove = (addremove == '+' ? '-' :
3783 addremove == '-' ? '+' : addremove);
3784
3785 if (options->prefix &&
3786 strncmp(concatpath, options->prefix, options->prefix_length))
3787 return;
3788
3789 one = alloc_filespec(concatpath);
3790 two = alloc_filespec(concatpath);
3791
3792 if (addremove != '+')
3793 fill_filespec(one, sha1, mode);
3794 if (addremove != '-') {
3795 fill_filespec(two, sha1, mode);
3796 two->dirty_submodule = dirty_submodule;
3797 }
3798
3799 diff_queue(&diff_queued_diff, one, two);
3800 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
3801 DIFF_OPT_SET(options, HAS_CHANGES);
3802 }
3803
3804 void diff_change(struct diff_options *options,
3805 unsigned old_mode, unsigned new_mode,
3806 const unsigned char *old_sha1,
3807 const unsigned char *new_sha1,
3808 const char *concatpath,
3809 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
3810 {
3811 struct diff_filespec *one, *two;
3812
3813 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3814 && S_ISGITLINK(new_mode))
3815 return;
3816
3817 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3818 unsigned tmp;
3819 const unsigned char *tmp_c;
3820 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3821 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3822 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
3823 new_dirty_submodule = tmp;
3824 }
3825
3826 if (options->prefix &&
3827 strncmp(concatpath, options->prefix, options->prefix_length))
3828 return;
3829
3830 one = alloc_filespec(concatpath);
3831 two = alloc_filespec(concatpath);
3832 fill_filespec(one, old_sha1, old_mode);
3833 fill_filespec(two, new_sha1, new_mode);
3834 one->dirty_submodule = old_dirty_submodule;
3835 two->dirty_submodule = new_dirty_submodule;
3836
3837 diff_queue(&diff_queued_diff, one, two);
3838 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
3839 DIFF_OPT_SET(options, HAS_CHANGES);
3840 }
3841
3842 void diff_unmerge(struct diff_options *options,
3843 const char *path,
3844 unsigned mode, const unsigned char *sha1)
3845 {
3846 struct diff_filespec *one, *two;
3847
3848 if (options->prefix &&
3849 strncmp(path, options->prefix, options->prefix_length))
3850 return;
3851
3852 one = alloc_filespec(path);
3853 two = alloc_filespec(path);
3854 fill_filespec(one, sha1, mode);
3855 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3856 }
3857
3858 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
3859 size_t *outsize)
3860 {
3861 struct diff_tempfile *temp;
3862 const char *argv[3];
3863 const char **arg = argv;
3864 struct child_process child;
3865 struct strbuf buf = STRBUF_INIT;
3866 int err = 0;
3867
3868 temp = prepare_temp_file(spec->path, spec);
3869 *arg++ = pgm;
3870 *arg++ = temp->name;
3871 *arg = NULL;
3872
3873 memset(&child, 0, sizeof(child));
3874 child.use_shell = 1;
3875 child.argv = argv;
3876 child.out = -1;
3877 if (start_command(&child)) {
3878 remove_tempfile();
3879 return NULL;
3880 }
3881
3882 if (strbuf_read(&buf, child.out, 0) < 0)
3883 err = error("error reading from textconv command '%s'", pgm);
3884 close(child.out);
3885
3886 if (finish_command(&child) || err) {
3887 strbuf_release(&buf);
3888 remove_tempfile();
3889 return NULL;
3890 }
3891 remove_tempfile();
3892
3893 return strbuf_detach(&buf, outsize);
3894 }