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octopus: remove dead code
[git/gitweb.git] / diff.c
blobcc0cb2b31f3f9b4ff00b12ad1d07671c7228749d
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
17 #ifdef NO_FAST_WORKING_DIRECTORY
18 #define FAST_WORKING_DIRECTORY 0
19 #else
20 #define FAST_WORKING_DIRECTORY 1
21 #endif
22
23 static int diff_detect_rename_default;
24 static int diff_rename_limit_default = 200;
25 static int diff_suppress_blank_empty;
26 int diff_use_color_default = -1;
27 static const char *diff_word_regex_cfg;
28 static const char *external_diff_cmd_cfg;
29 int diff_auto_refresh_index = 1;
30 static int diff_mnemonic_prefix;
31
32 static char diff_colors[][COLOR_MAXLEN] = {
33 GIT_COLOR_RESET,
34 GIT_COLOR_NORMAL, /* PLAIN */
35 GIT_COLOR_BOLD, /* METAINFO */
36 GIT_COLOR_CYAN, /* FRAGINFO */
37 GIT_COLOR_RED, /* OLD */
38 GIT_COLOR_GREEN, /* NEW */
39 GIT_COLOR_YELLOW, /* COMMIT */
40 GIT_COLOR_BG_RED, /* WHITESPACE */
41 };
42
43 static void diff_filespec_load_driver(struct diff_filespec *one);
44 static char *run_textconv(const char *, struct diff_filespec *, size_t *);
45
46 static int parse_diff_color_slot(const char *var, int ofs)
47 {
48 if (!strcasecmp(var+ofs, "plain"))
49 return DIFF_PLAIN;
50 if (!strcasecmp(var+ofs, "meta"))
51 return DIFF_METAINFO;
52 if (!strcasecmp(var+ofs, "frag"))
53 return DIFF_FRAGINFO;
54 if (!strcasecmp(var+ofs, "old"))
55 return DIFF_FILE_OLD;
56 if (!strcasecmp(var+ofs, "new"))
57 return DIFF_FILE_NEW;
58 if (!strcasecmp(var+ofs, "commit"))
59 return DIFF_COMMIT;
60 if (!strcasecmp(var+ofs, "whitespace"))
61 return DIFF_WHITESPACE;
62 die("bad config variable '%s'", var);
63 }
64
65 static int git_config_rename(const char *var, const char *value)
66 {
67 if (!value)
68 return DIFF_DETECT_RENAME;
69 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
70 return DIFF_DETECT_COPY;
71 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
72 }
73
74 /*
75 * These are to give UI layer defaults.
76 * The core-level commands such as git-diff-files should
77 * never be affected by the setting of diff.renames
78 * the user happens to have in the configuration file.
79 */
80 int git_diff_ui_config(const char *var, const char *value, void *cb)
81 {
82 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
83 diff_use_color_default = git_config_colorbool(var, value, -1);
84 return 0;
85 }
86 if (!strcmp(var, "diff.renames")) {
87 diff_detect_rename_default = git_config_rename(var, value);
88 return 0;
89 }
90 if (!strcmp(var, "diff.autorefreshindex")) {
91 diff_auto_refresh_index = git_config_bool(var, value);
92 return 0;
93 }
94 if (!strcmp(var, "diff.mnemonicprefix")) {
95 diff_mnemonic_prefix = git_config_bool(var, value);
96 return 0;
97 }
98 if (!strcmp(var, "diff.external"))
99 return git_config_string(&external_diff_cmd_cfg, var, value);
100 if (!strcmp(var, "diff.wordregex"))
101 return git_config_string(&diff_word_regex_cfg, var, value);
102
103 return git_diff_basic_config(var, value, cb);
104 }
105
106 int git_diff_basic_config(const char *var, const char *value, void *cb)
107 {
108 if (!strcmp(var, "diff.renamelimit")) {
109 diff_rename_limit_default = git_config_int(var, value);
110 return 0;
111 }
112
113 switch (userdiff_config(var, value)) {
114 case 0: break;
115 case -1: return -1;
116 default: return 0;
117 }
118
119 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
120 int slot = parse_diff_color_slot(var, 11);
121 if (!value)
122 return config_error_nonbool(var);
123 color_parse(value, var, diff_colors[slot]);
124 return 0;
125 }
126
127 /* like GNU diff's --suppress-blank-empty option */
128 if (!strcmp(var, "diff.suppressblankempty") ||
129 /* for backwards compatibility */
130 !strcmp(var, "diff.suppress-blank-empty")) {
131 diff_suppress_blank_empty = git_config_bool(var, value);
132 return 0;
133 }
134
135 return git_color_default_config(var, value, cb);
136 }
137
138 static char *quote_two(const char *one, const char *two)
139 {
140 int need_one = quote_c_style(one, NULL, NULL, 1);
141 int need_two = quote_c_style(two, NULL, NULL, 1);
142 struct strbuf res = STRBUF_INIT;
143
144 if (need_one + need_two) {
145 strbuf_addch(&res, '"');
146 quote_c_style(one, &res, NULL, 1);
147 quote_c_style(two, &res, NULL, 1);
148 strbuf_addch(&res, '"');
149 } else {
150 strbuf_addstr(&res, one);
151 strbuf_addstr(&res, two);
152 }
153 return strbuf_detach(&res, NULL);
154 }
155
156 static const char *external_diff(void)
157 {
158 static const char *external_diff_cmd = NULL;
159 static int done_preparing = 0;
160
161 if (done_preparing)
162 return external_diff_cmd;
163 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
164 if (!external_diff_cmd)
165 external_diff_cmd = external_diff_cmd_cfg;
166 done_preparing = 1;
167 return external_diff_cmd;
168 }
169
170 static struct diff_tempfile {
171 const char *name; /* filename external diff should read from */
172 char hex[41];
173 char mode[10];
174 char tmp_path[PATH_MAX];
175 } diff_temp[2];
176
177 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
178
179 struct emit_callback {
180 int color_diff;
181 unsigned ws_rule;
182 int blank_at_eof_in_preimage;
183 int blank_at_eof_in_postimage;
184 int lno_in_preimage;
185 int lno_in_postimage;
186 sane_truncate_fn truncate;
187 const char **label_path;
188 struct diff_words_data *diff_words;
189 int *found_changesp;
190 FILE *file;
191 };
192
193 static int count_lines(const char *data, int size)
194 {
195 int count, ch, completely_empty = 1, nl_just_seen = 0;
196 count = 0;
197 while (0 < size--) {
198 ch = *data++;
199 if (ch == '\n') {
200 count++;
201 nl_just_seen = 1;
202 completely_empty = 0;
203 }
204 else {
205 nl_just_seen = 0;
206 completely_empty = 0;
207 }
208 }
209 if (completely_empty)
210 return 0;
211 if (!nl_just_seen)
212 count++; /* no trailing newline */
213 return count;
214 }
215
216 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
217 {
218 if (!DIFF_FILE_VALID(one)) {
219 mf->ptr = (char *)""; /* does not matter */
220 mf->size = 0;
221 return 0;
222 }
223 else if (diff_populate_filespec(one, 0))
224 return -1;
225
226 mf->ptr = one->data;
227 mf->size = one->size;
228 return 0;
229 }
230
231 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
232 {
233 char *ptr = mf->ptr;
234 long size = mf->size;
235 int cnt = 0;
236
237 if (!size)
238 return cnt;
239 ptr += size - 1; /* pointing at the very end */
240 if (*ptr != '\n')
241 ; /* incomplete line */
242 else
243 ptr--; /* skip the last LF */
244 while (mf->ptr < ptr) {
245 char *prev_eol;
246 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
247 if (*prev_eol == '\n')
248 break;
249 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
250 break;
251 cnt++;
252 ptr = prev_eol - 1;
253 }
254 return cnt;
255 }
256
257 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
258 struct emit_callback *ecbdata)
259 {
260 int l1, l2, at;
261 unsigned ws_rule = ecbdata->ws_rule;
262 l1 = count_trailing_blank(mf1, ws_rule);
263 l2 = count_trailing_blank(mf2, ws_rule);
264 if (l2 <= l1) {
265 ecbdata->blank_at_eof_in_preimage = 0;
266 ecbdata->blank_at_eof_in_postimage = 0;
267 return;
268 }
269 at = count_lines(mf1->ptr, mf1->size);
270 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
271
272 at = count_lines(mf2->ptr, mf2->size);
273 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
274 }
275
276 static void emit_line_0(FILE *file, const char *set, const char *reset,
277 int first, const char *line, int len)
278 {
279 int has_trailing_newline, has_trailing_carriage_return;
280 int nofirst;
281
282 if (len == 0) {
283 has_trailing_newline = (first == '\n');
284 has_trailing_carriage_return = (!has_trailing_newline &&
285 (first == '\r'));
286 nofirst = has_trailing_newline || has_trailing_carriage_return;
287 } else {
288 has_trailing_newline = (len > 0 && line[len-1] == '\n');
289 if (has_trailing_newline)
290 len--;
291 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
292 if (has_trailing_carriage_return)
293 len--;
294 nofirst = 0;
295 }
296
297 fputs(set, file);
298
299 if (!nofirst)
300 fputc(first, file);
301 fwrite(line, len, 1, file);
302 fputs(reset, file);
303 if (has_trailing_carriage_return)
304 fputc('\r', file);
305 if (has_trailing_newline)
306 fputc('\n', file);
307 }
308
309 static void emit_line(FILE *file, const char *set, const char *reset,
310 const char *line, int len)
311 {
312 emit_line_0(file, set, reset, line[0], line+1, len-1);
313 }
314
315 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
316 {
317 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
318 ecbdata->blank_at_eof_in_preimage &&
319 ecbdata->blank_at_eof_in_postimage &&
320 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
321 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
322 return 0;
323 return ws_blank_line(line, len, ecbdata->ws_rule);
324 }
325
326 static void emit_add_line(const char *reset,
327 struct emit_callback *ecbdata,
328 const char *line, int len)
329 {
330 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
331 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
332
333 if (!*ws)
334 emit_line_0(ecbdata->file, set, reset, '+', line, len);
335 else if (new_blank_line_at_eof(ecbdata, line, len))
336 /* Blank line at EOF - paint '+' as well */
337 emit_line_0(ecbdata->file, ws, reset, '+', line, len);
338 else {
339 /* Emit just the prefix, then the rest. */
340 emit_line_0(ecbdata->file, set, reset, '+', "", 0);
341 ws_check_emit(line, len, ecbdata->ws_rule,
342 ecbdata->file, set, reset, ws);
343 }
344 }
345
346 static struct diff_tempfile *claim_diff_tempfile(void) {
347 int i;
348 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
349 if (!diff_temp[i].name)
350 return diff_temp + i;
351 die("BUG: diff is failing to clean up its tempfiles");
352 }
353
354 static int remove_tempfile_installed;
355
356 static void remove_tempfile(void)
357 {
358 int i;
359 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
360 if (diff_temp[i].name == diff_temp[i].tmp_path)
361 unlink_or_warn(diff_temp[i].name);
362 diff_temp[i].name = NULL;
363 }
364 }
365
366 static void remove_tempfile_on_signal(int signo)
367 {
368 remove_tempfile();
369 sigchain_pop(signo);
370 raise(signo);
371 }
372
373 static void print_line_count(FILE *file, int count)
374 {
375 switch (count) {
376 case 0:
377 fprintf(file, "0,0");
378 break;
379 case 1:
380 fprintf(file, "1");
381 break;
382 default:
383 fprintf(file, "1,%d", count);
384 break;
385 }
386 }
387
388 static void emit_rewrite_lines(struct emit_callback *ecb,
389 int prefix, const char *data, int size)
390 {
391 const char *endp = NULL;
392 static const char *nneof = " No newline at end of file\n";
393 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
394 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
395
396 while (0 < size) {
397 int len;
398
399 endp = memchr(data, '\n', size);
400 len = endp ? (endp - data + 1) : size;
401 if (prefix != '+') {
402 ecb->lno_in_preimage++;
403 emit_line_0(ecb->file, old, reset, '-',
404 data, len);
405 } else {
406 ecb->lno_in_postimage++;
407 emit_add_line(reset, ecb, data, len);
408 }
409 size -= len;
410 data += len;
411 }
412 if (!endp) {
413 const char *plain = diff_get_color(ecb->color_diff,
414 DIFF_PLAIN);
415 emit_line_0(ecb->file, plain, reset, '\\',
416 nneof, strlen(nneof));
417 }
418 }
419
420 static void emit_rewrite_diff(const char *name_a,
421 const char *name_b,
422 struct diff_filespec *one,
423 struct diff_filespec *two,
424 const char *textconv_one,
425 const char *textconv_two,
426 struct diff_options *o)
427 {
428 int lc_a, lc_b;
429 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
430 const char *name_a_tab, *name_b_tab;
431 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
432 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
433 const char *reset = diff_get_color(color_diff, DIFF_RESET);
434 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
435 const char *a_prefix, *b_prefix;
436 const char *data_one, *data_two;
437 size_t size_one, size_two;
438 struct emit_callback ecbdata;
439
440 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
441 a_prefix = o->b_prefix;
442 b_prefix = o->a_prefix;
443 } else {
444 a_prefix = o->a_prefix;
445 b_prefix = o->b_prefix;
446 }
447
448 name_a += (*name_a == '/');
449 name_b += (*name_b == '/');
450 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
451 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
452
453 strbuf_reset(&a_name);
454 strbuf_reset(&b_name);
455 quote_two_c_style(&a_name, a_prefix, name_a, 0);
456 quote_two_c_style(&b_name, b_prefix, name_b, 0);
457
458 diff_populate_filespec(one, 0);
459 diff_populate_filespec(two, 0);
460 if (textconv_one) {
461 data_one = run_textconv(textconv_one, one, &size_one);
462 if (!data_one)
463 die("unable to read files to diff");
464 }
465 else {
466 data_one = one->data;
467 size_one = one->size;
468 }
469 if (textconv_two) {
470 data_two = run_textconv(textconv_two, two, &size_two);
471 if (!data_two)
472 die("unable to read files to diff");
473 }
474 else {
475 data_two = two->data;
476 size_two = two->size;
477 }
478
479 memset(&ecbdata, 0, sizeof(ecbdata));
480 ecbdata.color_diff = color_diff;
481 ecbdata.found_changesp = &o->found_changes;
482 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
483 ecbdata.file = o->file;
484 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
485 mmfile_t mf1, mf2;
486 mf1.ptr = (char *)data_one;
487 mf2.ptr = (char *)data_two;
488 mf1.size = size_one;
489 mf2.size = size_two;
490 check_blank_at_eof(&mf1, &mf2, &ecbdata);
491 }
492 ecbdata.lno_in_preimage = 1;
493 ecbdata.lno_in_postimage = 1;
494
495 lc_a = count_lines(data_one, size_one);
496 lc_b = count_lines(data_two, size_two);
497 fprintf(o->file,
498 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
499 metainfo, a_name.buf, name_a_tab, reset,
500 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
501 print_line_count(o->file, lc_a);
502 fprintf(o->file, " +");
503 print_line_count(o->file, lc_b);
504 fprintf(o->file, " @@%s\n", reset);
505 if (lc_a)
506 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
507 if (lc_b)
508 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
509 }
510
511 struct diff_words_buffer {
512 mmfile_t text;
513 long alloc;
514 struct diff_words_orig {
515 const char *begin, *end;
516 } *orig;
517 int orig_nr, orig_alloc;
518 };
519
520 static void diff_words_append(char *line, unsigned long len,
521 struct diff_words_buffer *buffer)
522 {
523 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
524 line++;
525 len--;
526 memcpy(buffer->text.ptr + buffer->text.size, line, len);
527 buffer->text.size += len;
528 buffer->text.ptr[buffer->text.size] = '\0';
529 }
530
531 struct diff_words_data {
532 struct diff_words_buffer minus, plus;
533 const char *current_plus;
534 FILE *file;
535 regex_t *word_regex;
536 };
537
538 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
539 {
540 struct diff_words_data *diff_words = priv;
541 int minus_first, minus_len, plus_first, plus_len;
542 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
543
544 if (line[0] != '@' || parse_hunk_header(line, len,
545 &minus_first, &minus_len, &plus_first, &plus_len))
546 return;
547
548 /* POSIX requires that first be decremented by one if len == 0... */
549 if (minus_len) {
550 minus_begin = diff_words->minus.orig[minus_first].begin;
551 minus_end =
552 diff_words->minus.orig[minus_first + minus_len - 1].end;
553 } else
554 minus_begin = minus_end =
555 diff_words->minus.orig[minus_first].end;
556
557 if (plus_len) {
558 plus_begin = diff_words->plus.orig[plus_first].begin;
559 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
560 } else
561 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
562
563 if (diff_words->current_plus != plus_begin)
564 fwrite(diff_words->current_plus,
565 plus_begin - diff_words->current_plus, 1,
566 diff_words->file);
567 if (minus_begin != minus_end)
568 color_fwrite_lines(diff_words->file,
569 diff_get_color(1, DIFF_FILE_OLD),
570 minus_end - minus_begin, minus_begin);
571 if (plus_begin != plus_end)
572 color_fwrite_lines(diff_words->file,
573 diff_get_color(1, DIFF_FILE_NEW),
574 plus_end - plus_begin, plus_begin);
575
576 diff_words->current_plus = plus_end;
577 }
578
579 /* This function starts looking at *begin, and returns 0 iff a word was found. */
580 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
581 int *begin, int *end)
582 {
583 if (word_regex && *begin < buffer->size) {
584 regmatch_t match[1];
585 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
586 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
587 '\n', match[0].rm_eo - match[0].rm_so);
588 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
589 *begin += match[0].rm_so;
590 return *begin >= *end;
591 }
592 return -1;
593 }
594
595 /* find the next word */
596 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
597 (*begin)++;
598 if (*begin >= buffer->size)
599 return -1;
600
601 /* find the end of the word */
602 *end = *begin + 1;
603 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
604 (*end)++;
605
606 return 0;
607 }
608
609 /*
610 * This function splits the words in buffer->text, stores the list with
611 * newline separator into out, and saves the offsets of the original words
612 * in buffer->orig.
613 */
614 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
615 regex_t *word_regex)
616 {
617 int i, j;
618 long alloc = 0;
619
620 out->size = 0;
621 out->ptr = NULL;
622
623 /* fake an empty "0th" word */
624 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
625 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
626 buffer->orig_nr = 1;
627
628 for (i = 0; i < buffer->text.size; i++) {
629 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
630 return;
631
632 /* store original boundaries */
633 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
634 buffer->orig_alloc);
635 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
636 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
637 buffer->orig_nr++;
638
639 /* store one word */
640 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
641 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
642 out->ptr[out->size + j - i] = '\n';
643 out->size += j - i + 1;
644
645 i = j - 1;
646 }
647 }
648
649 /* this executes the word diff on the accumulated buffers */
650 static void diff_words_show(struct diff_words_data *diff_words)
651 {
652 xpparam_t xpp;
653 xdemitconf_t xecfg;
654 xdemitcb_t ecb;
655 mmfile_t minus, plus;
656
657 /* special case: only removal */
658 if (!diff_words->plus.text.size) {
659 color_fwrite_lines(diff_words->file,
660 diff_get_color(1, DIFF_FILE_OLD),
661 diff_words->minus.text.size, diff_words->minus.text.ptr);
662 diff_words->minus.text.size = 0;
663 return;
664 }
665
666 diff_words->current_plus = diff_words->plus.text.ptr;
667
668 memset(&xpp, 0, sizeof(xpp));
669 memset(&xecfg, 0, sizeof(xecfg));
670 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
671 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
672 xpp.flags = XDF_NEED_MINIMAL;
673 /* as only the hunk header will be parsed, we need a 0-context */
674 xecfg.ctxlen = 0;
675 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
676 &xpp, &xecfg, &ecb);
677 free(minus.ptr);
678 free(plus.ptr);
679 if (diff_words->current_plus != diff_words->plus.text.ptr +
680 diff_words->plus.text.size)
681 fwrite(diff_words->current_plus,
682 diff_words->plus.text.ptr + diff_words->plus.text.size
683 - diff_words->current_plus, 1,
684 diff_words->file);
685 diff_words->minus.text.size = diff_words->plus.text.size = 0;
686 }
687
688 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
689 static void diff_words_flush(struct emit_callback *ecbdata)
690 {
691 if (ecbdata->diff_words->minus.text.size ||
692 ecbdata->diff_words->plus.text.size)
693 diff_words_show(ecbdata->diff_words);
694 }
695
696 static void free_diff_words_data(struct emit_callback *ecbdata)
697 {
698 if (ecbdata->diff_words) {
699 diff_words_flush(ecbdata);
700 free (ecbdata->diff_words->minus.text.ptr);
701 free (ecbdata->diff_words->minus.orig);
702 free (ecbdata->diff_words->plus.text.ptr);
703 free (ecbdata->diff_words->plus.orig);
704 free(ecbdata->diff_words->word_regex);
705 free(ecbdata->diff_words);
706 ecbdata->diff_words = NULL;
707 }
708 }
709
710 const char *diff_get_color(int diff_use_color, enum color_diff ix)
711 {
712 if (diff_use_color)
713 return diff_colors[ix];
714 return "";
715 }
716
717 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
718 {
719 const char *cp;
720 unsigned long allot;
721 size_t l = len;
722
723 if (ecb->truncate)
724 return ecb->truncate(line, len);
725 cp = line;
726 allot = l;
727 while (0 < l) {
728 (void) utf8_width(&cp, &l);
729 if (!cp)
730 break; /* truncated in the middle? */
731 }
732 return allot - l;
733 }
734
735 static void find_lno(const char *line, struct emit_callback *ecbdata)
736 {
737 const char *p;
738 ecbdata->lno_in_preimage = 0;
739 ecbdata->lno_in_postimage = 0;
740 p = strchr(line, '-');
741 if (!p)
742 return; /* cannot happen */
743 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
744 p = strchr(p, '+');
745 if (!p)
746 return; /* cannot happen */
747 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
748 }
749
750 static void fn_out_consume(void *priv, char *line, unsigned long len)
751 {
752 struct emit_callback *ecbdata = priv;
753 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
754 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
755 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
756
757 *(ecbdata->found_changesp) = 1;
758
759 if (ecbdata->label_path[0]) {
760 const char *name_a_tab, *name_b_tab;
761
762 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
763 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
764
765 fprintf(ecbdata->file, "%s--- %s%s%s\n",
766 meta, ecbdata->label_path[0], reset, name_a_tab);
767 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
768 meta, ecbdata->label_path[1], reset, name_b_tab);
769 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
770 }
771
772 if (diff_suppress_blank_empty
773 && len == 2 && line[0] == ' ' && line[1] == '\n') {
774 line[0] = '\n';
775 len = 1;
776 }
777
778 if (line[0] == '@') {
779 if (ecbdata->diff_words)
780 diff_words_flush(ecbdata);
781 len = sane_truncate_line(ecbdata, line, len);
782 find_lno(line, ecbdata);
783 emit_line(ecbdata->file,
784 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
785 reset, line, len);
786 if (line[len-1] != '\n')
787 putc('\n', ecbdata->file);
788 return;
789 }
790
791 if (len < 1) {
792 emit_line(ecbdata->file, reset, reset, line, len);
793 return;
794 }
795
796 if (ecbdata->diff_words) {
797 if (line[0] == '-') {
798 diff_words_append(line, len,
799 &ecbdata->diff_words->minus);
800 return;
801 } else if (line[0] == '+') {
802 diff_words_append(line, len,
803 &ecbdata->diff_words->plus);
804 return;
805 }
806 diff_words_flush(ecbdata);
807 line++;
808 len--;
809 emit_line(ecbdata->file, plain, reset, line, len);
810 return;
811 }
812
813 if (line[0] != '+') {
814 const char *color =
815 diff_get_color(ecbdata->color_diff,
816 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
817 ecbdata->lno_in_preimage++;
818 if (line[0] == ' ')
819 ecbdata->lno_in_postimage++;
820 emit_line(ecbdata->file, color, reset, line, len);
821 } else {
822 ecbdata->lno_in_postimage++;
823 emit_add_line(reset, ecbdata, line + 1, len - 1);
824 }
825 }
826
827 static char *pprint_rename(const char *a, const char *b)
828 {
829 const char *old = a;
830 const char *new = b;
831 struct strbuf name = STRBUF_INIT;
832 int pfx_length, sfx_length;
833 int len_a = strlen(a);
834 int len_b = strlen(b);
835 int a_midlen, b_midlen;
836 int qlen_a = quote_c_style(a, NULL, NULL, 0);
837 int qlen_b = quote_c_style(b, NULL, NULL, 0);
838
839 if (qlen_a || qlen_b) {
840 quote_c_style(a, &name, NULL, 0);
841 strbuf_addstr(&name, " => ");
842 quote_c_style(b, &name, NULL, 0);
843 return strbuf_detach(&name, NULL);
844 }
845
846 /* Find common prefix */
847 pfx_length = 0;
848 while (*old && *new && *old == *new) {
849 if (*old == '/')
850 pfx_length = old - a + 1;
851 old++;
852 new++;
853 }
854
855 /* Find common suffix */
856 old = a + len_a;
857 new = b + len_b;
858 sfx_length = 0;
859 while (a <= old && b <= new && *old == *new) {
860 if (*old == '/')
861 sfx_length = len_a - (old - a);
862 old--;
863 new--;
864 }
865
866 /*
867 * pfx{mid-a => mid-b}sfx
868 * {pfx-a => pfx-b}sfx
869 * pfx{sfx-a => sfx-b}
870 * name-a => name-b
871 */
872 a_midlen = len_a - pfx_length - sfx_length;
873 b_midlen = len_b - pfx_length - sfx_length;
874 if (a_midlen < 0)
875 a_midlen = 0;
876 if (b_midlen < 0)
877 b_midlen = 0;
878
879 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
880 if (pfx_length + sfx_length) {
881 strbuf_add(&name, a, pfx_length);
882 strbuf_addch(&name, '{');
883 }
884 strbuf_add(&name, a + pfx_length, a_midlen);
885 strbuf_addstr(&name, " => ");
886 strbuf_add(&name, b + pfx_length, b_midlen);
887 if (pfx_length + sfx_length) {
888 strbuf_addch(&name, '}');
889 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
890 }
891 return strbuf_detach(&name, NULL);
892 }
893
894 struct diffstat_t {
895 int nr;
896 int alloc;
897 struct diffstat_file {
898 char *from_name;
899 char *name;
900 char *print_name;
901 unsigned is_unmerged:1;
902 unsigned is_binary:1;
903 unsigned is_renamed:1;
904 unsigned int added, deleted;
905 } **files;
906 };
907
908 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
909 const char *name_a,
910 const char *name_b)
911 {
912 struct diffstat_file *x;
913 x = xcalloc(sizeof (*x), 1);
914 if (diffstat->nr == diffstat->alloc) {
915 diffstat->alloc = alloc_nr(diffstat->alloc);
916 diffstat->files = xrealloc(diffstat->files,
917 diffstat->alloc * sizeof(x));
918 }
919 diffstat->files[diffstat->nr++] = x;
920 if (name_b) {
921 x->from_name = xstrdup(name_a);
922 x->name = xstrdup(name_b);
923 x->is_renamed = 1;
924 }
925 else {
926 x->from_name = NULL;
927 x->name = xstrdup(name_a);
928 }
929 return x;
930 }
931
932 static void diffstat_consume(void *priv, char *line, unsigned long len)
933 {
934 struct diffstat_t *diffstat = priv;
935 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
936
937 if (line[0] == '+')
938 x->added++;
939 else if (line[0] == '-')
940 x->deleted++;
941 }
942
943 const char mime_boundary_leader[] = "------------";
944
945 static int scale_linear(int it, int width, int max_change)
946 {
947 /*
948 * make sure that at least one '-' is printed if there were deletions,
949 * and likewise for '+'.
950 */
951 if (max_change < 2)
952 return it;
953 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
954 }
955
956 static void show_name(FILE *file,
957 const char *prefix, const char *name, int len)
958 {
959 fprintf(file, " %s%-*s |", prefix, len, name);
960 }
961
962 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
963 {
964 if (cnt <= 0)
965 return;
966 fprintf(file, "%s", set);
967 while (cnt--)
968 putc(ch, file);
969 fprintf(file, "%s", reset);
970 }
971
972 static void fill_print_name(struct diffstat_file *file)
973 {
974 char *pname;
975
976 if (file->print_name)
977 return;
978
979 if (!file->is_renamed) {
980 struct strbuf buf = STRBUF_INIT;
981 if (quote_c_style(file->name, &buf, NULL, 0)) {
982 pname = strbuf_detach(&buf, NULL);
983 } else {
984 pname = file->name;
985 strbuf_release(&buf);
986 }
987 } else {
988 pname = pprint_rename(file->from_name, file->name);
989 }
990 file->print_name = pname;
991 }
992
993 static void show_stats(struct diffstat_t *data, struct diff_options *options)
994 {
995 int i, len, add, del, adds = 0, dels = 0;
996 int max_change = 0, max_len = 0;
997 int total_files = data->nr;
998 int width, name_width;
999 const char *reset, *set, *add_c, *del_c;
1000
1001 if (data->nr == 0)
1002 return;
1003
1004 width = options->stat_width ? options->stat_width : 80;
1005 name_width = options->stat_name_width ? options->stat_name_width : 50;
1006
1007 /* Sanity: give at least 5 columns to the graph,
1008 * but leave at least 10 columns for the name.
1009 */
1010 if (width < 25)
1011 width = 25;
1012 if (name_width < 10)
1013 name_width = 10;
1014 else if (width < name_width + 15)
1015 name_width = width - 15;
1016
1017 /* Find the longest filename and max number of changes */
1018 reset = diff_get_color_opt(options, DIFF_RESET);
1019 set = diff_get_color_opt(options, DIFF_PLAIN);
1020 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1021 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1022
1023 for (i = 0; i < data->nr; i++) {
1024 struct diffstat_file *file = data->files[i];
1025 int change = file->added + file->deleted;
1026 fill_print_name(file);
1027 len = strlen(file->print_name);
1028 if (max_len < len)
1029 max_len = len;
1030
1031 if (file->is_binary || file->is_unmerged)
1032 continue;
1033 if (max_change < change)
1034 max_change = change;
1035 }
1036
1037 /* Compute the width of the graph part;
1038 * 10 is for one blank at the beginning of the line plus
1039 * " | count " between the name and the graph.
1040 *
1041 * From here on, name_width is the width of the name area,
1042 * and width is the width of the graph area.
1043 */
1044 name_width = (name_width < max_len) ? name_width : max_len;
1045 if (width < (name_width + 10) + max_change)
1046 width = width - (name_width + 10);
1047 else
1048 width = max_change;
1049
1050 for (i = 0; i < data->nr; i++) {
1051 const char *prefix = "";
1052 char *name = data->files[i]->print_name;
1053 int added = data->files[i]->added;
1054 int deleted = data->files[i]->deleted;
1055 int name_len;
1056
1057 /*
1058 * "scale" the filename
1059 */
1060 len = name_width;
1061 name_len = strlen(name);
1062 if (name_width < name_len) {
1063 char *slash;
1064 prefix = "...";
1065 len -= 3;
1066 name += name_len - len;
1067 slash = strchr(name, '/');
1068 if (slash)
1069 name = slash;
1070 }
1071
1072 if (data->files[i]->is_binary) {
1073 show_name(options->file, prefix, name, len);
1074 fprintf(options->file, " Bin ");
1075 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
1076 fprintf(options->file, " -> ");
1077 fprintf(options->file, "%s%d%s", add_c, added, reset);
1078 fprintf(options->file, " bytes");
1079 fprintf(options->file, "\n");
1080 continue;
1081 }
1082 else if (data->files[i]->is_unmerged) {
1083 show_name(options->file, prefix, name, len);
1084 fprintf(options->file, " Unmerged\n");
1085 continue;
1086 }
1087 else if (!data->files[i]->is_renamed &&
1088 (added + deleted == 0)) {
1089 total_files--;
1090 continue;
1091 }
1092
1093 /*
1094 * scale the add/delete
1095 */
1096 add = added;
1097 del = deleted;
1098 adds += add;
1099 dels += del;
1100
1101 if (width <= max_change) {
1102 add = scale_linear(add, width, max_change);
1103 del = scale_linear(del, width, max_change);
1104 }
1105 show_name(options->file, prefix, name, len);
1106 fprintf(options->file, "%5d%s", added + deleted,
1107 added + deleted ? " " : "");
1108 show_graph(options->file, '+', add, add_c, reset);
1109 show_graph(options->file, '-', del, del_c, reset);
1110 fprintf(options->file, "\n");
1111 }
1112 fprintf(options->file,
1113 " %d files changed, %d insertions(+), %d deletions(-)\n",
1114 total_files, adds, dels);
1115 }
1116
1117 static void show_shortstats(struct diffstat_t* data, struct diff_options *options)
1118 {
1119 int i, adds = 0, dels = 0, total_files = data->nr;
1120
1121 if (data->nr == 0)
1122 return;
1123
1124 for (i = 0; i < data->nr; i++) {
1125 if (!data->files[i]->is_binary &&
1126 !data->files[i]->is_unmerged) {
1127 int added = data->files[i]->added;
1128 int deleted= data->files[i]->deleted;
1129 if (!data->files[i]->is_renamed &&
1130 (added + deleted == 0)) {
1131 total_files--;
1132 } else {
1133 adds += added;
1134 dels += deleted;
1135 }
1136 }
1137 }
1138 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1139 total_files, adds, dels);
1140 }
1141
1142 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1143 {
1144 int i;
1145
1146 if (data->nr == 0)
1147 return;
1148
1149 for (i = 0; i < data->nr; i++) {
1150 struct diffstat_file *file = data->files[i];
1151
1152 if (file->is_binary)
1153 fprintf(options->file, "-\t-\t");
1154 else
1155 fprintf(options->file,
1156 "%d\t%d\t", file->added, file->deleted);
1157 if (options->line_termination) {
1158 fill_print_name(file);
1159 if (!file->is_renamed)
1160 write_name_quoted(file->name, options->file,
1161 options->line_termination);
1162 else {
1163 fputs(file->print_name, options->file);
1164 putc(options->line_termination, options->file);
1165 }
1166 } else {
1167 if (file->is_renamed) {
1168 putc('\0', options->file);
1169 write_name_quoted(file->from_name, options->file, '\0');
1170 }
1171 write_name_quoted(file->name, options->file, '\0');
1172 }
1173 }
1174 }
1175
1176 struct dirstat_file {
1177 const char *name;
1178 unsigned long changed;
1179 };
1180
1181 struct dirstat_dir {
1182 struct dirstat_file *files;
1183 int alloc, nr, percent, cumulative;
1184 };
1185
1186 static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
1187 {
1188 unsigned long this_dir = 0;
1189 unsigned int sources = 0;
1190
1191 while (dir->nr) {
1192 struct dirstat_file *f = dir->files;
1193 int namelen = strlen(f->name);
1194 unsigned long this;
1195 char *slash;
1196
1197 if (namelen < baselen)
1198 break;
1199 if (memcmp(f->name, base, baselen))
1200 break;
1201 slash = strchr(f->name + baselen, '/');
1202 if (slash) {
1203 int newbaselen = slash + 1 - f->name;
1204 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
1205 sources++;
1206 } else {
1207 this = f->changed;
1208 dir->files++;
1209 dir->nr--;
1210 sources += 2;
1211 }
1212 this_dir += this;
1213 }
1214
1215 /*
1216 * We don't report dirstat's for
1217 * - the top level
1218 * - or cases where everything came from a single directory
1219 * under this directory (sources == 1).
1220 */
1221 if (baselen && sources != 1) {
1222 int permille = this_dir * 1000 / changed;
1223 if (permille) {
1224 int percent = permille / 10;
1225 if (percent >= dir->percent) {
1226 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1227 if (!dir->cumulative)
1228 return 0;
1229 }
1230 }
1231 }
1232 return this_dir;
1233 }
1234
1235 static int dirstat_compare(const void *_a, const void *_b)
1236 {
1237 const struct dirstat_file *a = _a;
1238 const struct dirstat_file *b = _b;
1239 return strcmp(a->name, b->name);
1240 }
1241
1242 static void show_dirstat(struct diff_options *options)
1243 {
1244 int i;
1245 unsigned long changed;
1246 struct dirstat_dir dir;
1247 struct diff_queue_struct *q = &diff_queued_diff;
1248
1249 dir.files = NULL;
1250 dir.alloc = 0;
1251 dir.nr = 0;
1252 dir.percent = options->dirstat_percent;
1253 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1254
1255 changed = 0;
1256 for (i = 0; i < q->nr; i++) {
1257 struct diff_filepair *p = q->queue[i];
1258 const char *name;
1259 unsigned long copied, added, damage;
1260
1261 name = p->one->path ? p->one->path : p->two->path;
1262
1263 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1264 diff_populate_filespec(p->one, 0);
1265 diff_populate_filespec(p->two, 0);
1266 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1267 &copied, &added);
1268 diff_free_filespec_data(p->one);
1269 diff_free_filespec_data(p->two);
1270 } else if (DIFF_FILE_VALID(p->one)) {
1271 diff_populate_filespec(p->one, 1);
1272 copied = added = 0;
1273 diff_free_filespec_data(p->one);
1274 } else if (DIFF_FILE_VALID(p->two)) {
1275 diff_populate_filespec(p->two, 1);
1276 copied = 0;
1277 added = p->two->size;
1278 diff_free_filespec_data(p->two);
1279 } else
1280 continue;
1281
1282 /*
1283 * Original minus copied is the removed material,
1284 * added is the new material. They are both damages
1285 * made to the preimage. In --dirstat-by-file mode, count
1286 * damaged files, not damaged lines. This is done by
1287 * counting only a single damaged line per file.
1288 */
1289 damage = (p->one->size - copied) + added;
1290 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1291 damage = 1;
1292
1293 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1294 dir.files[dir.nr].name = name;
1295 dir.files[dir.nr].changed = damage;
1296 changed += damage;
1297 dir.nr++;
1298 }
1299
1300 /* This can happen even with many files, if everything was renames */
1301 if (!changed)
1302 return;
1303
1304 /* Show all directories with more than x% of the changes */
1305 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1306 gather_dirstat(options->file, &dir, changed, "", 0);
1307 }
1308
1309 static void free_diffstat_info(struct diffstat_t *diffstat)
1310 {
1311 int i;
1312 for (i = 0; i < diffstat->nr; i++) {
1313 struct diffstat_file *f = diffstat->files[i];
1314 if (f->name != f->print_name)
1315 free(f->print_name);
1316 free(f->name);
1317 free(f->from_name);
1318 free(f);
1319 }
1320 free(diffstat->files);
1321 }
1322
1323 struct checkdiff_t {
1324 const char *filename;
1325 int lineno;
1326 struct diff_options *o;
1327 unsigned ws_rule;
1328 unsigned status;
1329 };
1330
1331 static int is_conflict_marker(const char *line, unsigned long len)
1332 {
1333 char firstchar;
1334 int cnt;
1335
1336 if (len < 8)
1337 return 0;
1338 firstchar = line[0];
1339 switch (firstchar) {
1340 case '=': case '>': case '<':
1341 break;
1342 default:
1343 return 0;
1344 }
1345 for (cnt = 1; cnt < 7; cnt++)
1346 if (line[cnt] != firstchar)
1347 return 0;
1348 /* line[0] thru line[6] are same as firstchar */
1349 if (firstchar == '=') {
1350 /* divider between ours and theirs? */
1351 if (len != 8 || line[7] != '\n')
1352 return 0;
1353 } else if (len < 8 || !isspace(line[7])) {
1354 /* not divider before ours nor after theirs */
1355 return 0;
1356 }
1357 return 1;
1358 }
1359
1360 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1361 {
1362 struct checkdiff_t *data = priv;
1363 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1364 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1365 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1366 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1367 char *err;
1368
1369 if (line[0] == '+') {
1370 unsigned bad;
1371 data->lineno++;
1372 if (is_conflict_marker(line + 1, len - 1)) {
1373 data->status |= 1;
1374 fprintf(data->o->file,
1375 "%s:%d: leftover conflict marker\n",
1376 data->filename, data->lineno);
1377 }
1378 bad = ws_check(line + 1, len - 1, data->ws_rule);
1379 if (!bad)
1380 return;
1381 data->status |= bad;
1382 err = whitespace_error_string(bad);
1383 fprintf(data->o->file, "%s:%d: %s.\n",
1384 data->filename, data->lineno, err);
1385 free(err);
1386 emit_line(data->o->file, set, reset, line, 1);
1387 ws_check_emit(line + 1, len - 1, data->ws_rule,
1388 data->o->file, set, reset, ws);
1389 } else if (line[0] == ' ') {
1390 data->lineno++;
1391 } else if (line[0] == '@') {
1392 char *plus = strchr(line, '+');
1393 if (plus)
1394 data->lineno = strtol(plus, NULL, 10) - 1;
1395 else
1396 die("invalid diff");
1397 }
1398 }
1399
1400 static unsigned char *deflate_it(char *data,
1401 unsigned long size,
1402 unsigned long *result_size)
1403 {
1404 int bound;
1405 unsigned char *deflated;
1406 z_stream stream;
1407
1408 memset(&stream, 0, sizeof(stream));
1409 deflateInit(&stream, zlib_compression_level);
1410 bound = deflateBound(&stream, size);
1411 deflated = xmalloc(bound);
1412 stream.next_out = deflated;
1413 stream.avail_out = bound;
1414
1415 stream.next_in = (unsigned char *)data;
1416 stream.avail_in = size;
1417 while (deflate(&stream, Z_FINISH) == Z_OK)
1418 ; /* nothing */
1419 deflateEnd(&stream);
1420 *result_size = stream.total_out;
1421 return deflated;
1422 }
1423
1424 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
1425 {
1426 void *cp;
1427 void *delta;
1428 void *deflated;
1429 void *data;
1430 unsigned long orig_size;
1431 unsigned long delta_size;
1432 unsigned long deflate_size;
1433 unsigned long data_size;
1434
1435 /* We could do deflated delta, or we could do just deflated two,
1436 * whichever is smaller.
1437 */
1438 delta = NULL;
1439 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1440 if (one->size && two->size) {
1441 delta = diff_delta(one->ptr, one->size,
1442 two->ptr, two->size,
1443 &delta_size, deflate_size);
1444 if (delta) {
1445 void *to_free = delta;
1446 orig_size = delta_size;
1447 delta = deflate_it(delta, delta_size, &delta_size);
1448 free(to_free);
1449 }
1450 }
1451
1452 if (delta && delta_size < deflate_size) {
1453 fprintf(file, "delta %lu\n", orig_size);
1454 free(deflated);
1455 data = delta;
1456 data_size = delta_size;
1457 }
1458 else {
1459 fprintf(file, "literal %lu\n", two->size);
1460 free(delta);
1461 data = deflated;
1462 data_size = deflate_size;
1463 }
1464
1465 /* emit data encoded in base85 */
1466 cp = data;
1467 while (data_size) {
1468 int bytes = (52 < data_size) ? 52 : data_size;
1469 char line[70];
1470 data_size -= bytes;
1471 if (bytes <= 26)
1472 line[0] = bytes + 'A' - 1;
1473 else
1474 line[0] = bytes - 26 + 'a' - 1;
1475 encode_85(line + 1, cp, bytes);
1476 cp = (char *) cp + bytes;
1477 fputs(line, file);
1478 fputc('\n', file);
1479 }
1480 fprintf(file, "\n");
1481 free(data);
1482 }
1483
1484 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
1485 {
1486 fprintf(file, "GIT binary patch\n");
1487 emit_binary_diff_body(file, one, two);
1488 emit_binary_diff_body(file, two, one);
1489 }
1490
1491 static void diff_filespec_load_driver(struct diff_filespec *one)
1492 {
1493 if (!one->driver)
1494 one->driver = userdiff_find_by_path(one->path);
1495 if (!one->driver)
1496 one->driver = userdiff_find_by_name("default");
1497 }
1498
1499 int diff_filespec_is_binary(struct diff_filespec *one)
1500 {
1501 if (one->is_binary == -1) {
1502 diff_filespec_load_driver(one);
1503 if (one->driver->binary != -1)
1504 one->is_binary = one->driver->binary;
1505 else {
1506 if (!one->data && DIFF_FILE_VALID(one))
1507 diff_populate_filespec(one, 0);
1508 if (one->data)
1509 one->is_binary = buffer_is_binary(one->data,
1510 one->size);
1511 if (one->is_binary == -1)
1512 one->is_binary = 0;
1513 }
1514 }
1515 return one->is_binary;
1516 }
1517
1518 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1519 {
1520 diff_filespec_load_driver(one);
1521 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1522 }
1523
1524 static const char *userdiff_word_regex(struct diff_filespec *one)
1525 {
1526 diff_filespec_load_driver(one);
1527 return one->driver->word_regex;
1528 }
1529
1530 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1531 {
1532 if (!options->a_prefix)
1533 options->a_prefix = a;
1534 if (!options->b_prefix)
1535 options->b_prefix = b;
1536 }
1537
1538 static const char *get_textconv(struct diff_filespec *one)
1539 {
1540 if (!DIFF_FILE_VALID(one))
1541 return NULL;
1542 if (!S_ISREG(one->mode))
1543 return NULL;
1544 diff_filespec_load_driver(one);
1545 return one->driver->textconv;
1546 }
1547
1548 static void builtin_diff(const char *name_a,
1549 const char *name_b,
1550 struct diff_filespec *one,
1551 struct diff_filespec *two,
1552 const char *xfrm_msg,
1553 struct diff_options *o,
1554 int complete_rewrite)
1555 {
1556 mmfile_t mf1, mf2;
1557 const char *lbl[2];
1558 char *a_one, *b_two;
1559 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1560 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1561 const char *a_prefix, *b_prefix;
1562 const char *textconv_one = NULL, *textconv_two = NULL;
1563
1564 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1565 textconv_one = get_textconv(one);
1566 textconv_two = get_textconv(two);
1567 }
1568
1569 diff_set_mnemonic_prefix(o, "a/", "b/");
1570 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1571 a_prefix = o->b_prefix;
1572 b_prefix = o->a_prefix;
1573 } else {
1574 a_prefix = o->a_prefix;
1575 b_prefix = o->b_prefix;
1576 }
1577
1578 /* Never use a non-valid filename anywhere if at all possible */
1579 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1580 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1581
1582 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1583 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1584 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1585 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1586 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1587 if (lbl[0][0] == '/') {
1588 /* /dev/null */
1589 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
1590 if (xfrm_msg && xfrm_msg[0])
1591 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1592 }
1593 else if (lbl[1][0] == '/') {
1594 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1595 if (xfrm_msg && xfrm_msg[0])
1596 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1597 }
1598 else {
1599 if (one->mode != two->mode) {
1600 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1601 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
1602 }
1603 if (xfrm_msg && xfrm_msg[0])
1604 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1605 /*
1606 * we do not run diff between different kind
1607 * of objects.
1608 */
1609 if ((one->mode ^ two->mode) & S_IFMT)
1610 goto free_ab_and_return;
1611 if (complete_rewrite &&
1612 (textconv_one || !diff_filespec_is_binary(one)) &&
1613 (textconv_two || !diff_filespec_is_binary(two))) {
1614 emit_rewrite_diff(name_a, name_b, one, two,
1615 textconv_one, textconv_two, o);
1616 o->found_changes = 1;
1617 goto free_ab_and_return;
1618 }
1619 }
1620
1621 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1622 die("unable to read files to diff");
1623
1624 if (!DIFF_OPT_TST(o, TEXT) &&
1625 ( (diff_filespec_is_binary(one) && !textconv_one) ||
1626 (diff_filespec_is_binary(two) && !textconv_two) )) {
1627 /* Quite common confusing case */
1628 if (mf1.size == mf2.size &&
1629 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1630 goto free_ab_and_return;
1631 if (DIFF_OPT_TST(o, BINARY))
1632 emit_binary_diff(o->file, &mf1, &mf2);
1633 else
1634 fprintf(o->file, "Binary files %s and %s differ\n",
1635 lbl[0], lbl[1]);
1636 o->found_changes = 1;
1637 }
1638 else {
1639 /* Crazy xdl interfaces.. */
1640 const char *diffopts = getenv("GIT_DIFF_OPTS");
1641 xpparam_t xpp;
1642 xdemitconf_t xecfg;
1643 xdemitcb_t ecb;
1644 struct emit_callback ecbdata;
1645 const struct userdiff_funcname *pe;
1646
1647 if (textconv_one) {
1648 size_t size;
1649 mf1.ptr = run_textconv(textconv_one, one, &size);
1650 if (!mf1.ptr)
1651 die("unable to read files to diff");
1652 mf1.size = size;
1653 }
1654 if (textconv_two) {
1655 size_t size;
1656 mf2.ptr = run_textconv(textconv_two, two, &size);
1657 if (!mf2.ptr)
1658 die("unable to read files to diff");
1659 mf2.size = size;
1660 }
1661
1662 pe = diff_funcname_pattern(one);
1663 if (!pe)
1664 pe = diff_funcname_pattern(two);
1665
1666 memset(&xpp, 0, sizeof(xpp));
1667 memset(&xecfg, 0, sizeof(xecfg));
1668 memset(&ecbdata, 0, sizeof(ecbdata));
1669 ecbdata.label_path = lbl;
1670 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1671 ecbdata.found_changesp = &o->found_changes;
1672 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1673 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
1674 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1675 ecbdata.file = o->file;
1676 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1677 xecfg.ctxlen = o->context;
1678 xecfg.interhunkctxlen = o->interhunkcontext;
1679 xecfg.flags = XDL_EMIT_FUNCNAMES;
1680 if (pe)
1681 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1682 if (!diffopts)
1683 ;
1684 else if (!prefixcmp(diffopts, "--unified="))
1685 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1686 else if (!prefixcmp(diffopts, "-u"))
1687 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1688 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1689 ecbdata.diff_words =
1690 xcalloc(1, sizeof(struct diff_words_data));
1691 ecbdata.diff_words->file = o->file;
1692 if (!o->word_regex)
1693 o->word_regex = userdiff_word_regex(one);
1694 if (!o->word_regex)
1695 o->word_regex = userdiff_word_regex(two);
1696 if (!o->word_regex)
1697 o->word_regex = diff_word_regex_cfg;
1698 if (o->word_regex) {
1699 ecbdata.diff_words->word_regex = (regex_t *)
1700 xmalloc(sizeof(regex_t));
1701 if (regcomp(ecbdata.diff_words->word_regex,
1702 o->word_regex,
1703 REG_EXTENDED | REG_NEWLINE))
1704 die ("Invalid regular expression: %s",
1705 o->word_regex);
1706 }
1707 }
1708 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
1709 &xpp, &xecfg, &ecb);
1710 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1711 free_diff_words_data(&ecbdata);
1712 if (textconv_one)
1713 free(mf1.ptr);
1714 if (textconv_two)
1715 free(mf2.ptr);
1716 xdiff_clear_find_func(&xecfg);
1717 }
1718
1719 free_ab_and_return:
1720 diff_free_filespec_data(one);
1721 diff_free_filespec_data(two);
1722 free(a_one);
1723 free(b_two);
1724 return;
1725 }
1726
1727 static void builtin_diffstat(const char *name_a, const char *name_b,
1728 struct diff_filespec *one,
1729 struct diff_filespec *two,
1730 struct diffstat_t *diffstat,
1731 struct diff_options *o,
1732 int complete_rewrite)
1733 {
1734 mmfile_t mf1, mf2;
1735 struct diffstat_file *data;
1736
1737 data = diffstat_add(diffstat, name_a, name_b);
1738
1739 if (!one || !two) {
1740 data->is_unmerged = 1;
1741 return;
1742 }
1743 if (complete_rewrite) {
1744 diff_populate_filespec(one, 0);
1745 diff_populate_filespec(two, 0);
1746 data->deleted = count_lines(one->data, one->size);
1747 data->added = count_lines(two->data, two->size);
1748 goto free_and_return;
1749 }
1750 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1751 die("unable to read files to diff");
1752
1753 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1754 data->is_binary = 1;
1755 data->added = mf2.size;
1756 data->deleted = mf1.size;
1757 } else {
1758 /* Crazy xdl interfaces.. */
1759 xpparam_t xpp;
1760 xdemitconf_t xecfg;
1761 xdemitcb_t ecb;
1762
1763 memset(&xpp, 0, sizeof(xpp));
1764 memset(&xecfg, 0, sizeof(xecfg));
1765 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1766 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
1767 &xpp, &xecfg, &ecb);
1768 }
1769
1770 free_and_return:
1771 diff_free_filespec_data(one);
1772 diff_free_filespec_data(two);
1773 }
1774
1775 static void builtin_checkdiff(const char *name_a, const char *name_b,
1776 const char *attr_path,
1777 struct diff_filespec *one,
1778 struct diff_filespec *two,
1779 struct diff_options *o)
1780 {
1781 mmfile_t mf1, mf2;
1782 struct checkdiff_t data;
1783
1784 if (!two)
1785 return;
1786
1787 memset(&data, 0, sizeof(data));
1788 data.filename = name_b ? name_b : name_a;
1789 data.lineno = 0;
1790 data.o = o;
1791 data.ws_rule = whitespace_rule(attr_path);
1792
1793 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1794 die("unable to read files to diff");
1795
1796 /*
1797 * All the other codepaths check both sides, but not checking
1798 * the "old" side here is deliberate. We are checking the newly
1799 * introduced changes, and as long as the "new" side is text, we
1800 * can and should check what it introduces.
1801 */
1802 if (diff_filespec_is_binary(two))
1803 goto free_and_return;
1804 else {
1805 /* Crazy xdl interfaces.. */
1806 xpparam_t xpp;
1807 xdemitconf_t xecfg;
1808 xdemitcb_t ecb;
1809
1810 memset(&xpp, 0, sizeof(xpp));
1811 memset(&xecfg, 0, sizeof(xecfg));
1812 xecfg.ctxlen = 1; /* at least one context line */
1813 xpp.flags = XDF_NEED_MINIMAL;
1814 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
1815 &xpp, &xecfg, &ecb);
1816
1817 if (data.ws_rule & WS_BLANK_AT_EOF) {
1818 struct emit_callback ecbdata;
1819 int blank_at_eof;
1820
1821 ecbdata.ws_rule = data.ws_rule;
1822 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1823 blank_at_eof = ecbdata.blank_at_eof_in_preimage;
1824
1825 if (blank_at_eof) {
1826 static char *err;
1827 if (!err)
1828 err = whitespace_error_string(WS_BLANK_AT_EOF);
1829 fprintf(o->file, "%s:%d: %s.\n",
1830 data.filename, blank_at_eof, err);
1831 data.status = 1; /* report errors */
1832 }
1833 }
1834 }
1835 free_and_return:
1836 diff_free_filespec_data(one);
1837 diff_free_filespec_data(two);
1838 if (data.status)
1839 DIFF_OPT_SET(o, CHECK_FAILED);
1840 }
1841
1842 struct diff_filespec *alloc_filespec(const char *path)
1843 {
1844 int namelen = strlen(path);
1845 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1846
1847 memset(spec, 0, sizeof(*spec));
1848 spec->path = (char *)(spec + 1);
1849 memcpy(spec->path, path, namelen+1);
1850 spec->count = 1;
1851 spec->is_binary = -1;
1852 return spec;
1853 }
1854
1855 void free_filespec(struct diff_filespec *spec)
1856 {
1857 if (!--spec->count) {
1858 diff_free_filespec_data(spec);
1859 free(spec);
1860 }
1861 }
1862
1863 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1864 unsigned short mode)
1865 {
1866 if (mode) {
1867 spec->mode = canon_mode(mode);
1868 hashcpy(spec->sha1, sha1);
1869 spec->sha1_valid = !is_null_sha1(sha1);
1870 }
1871 }
1872
1873 /*
1874 * Given a name and sha1 pair, if the index tells us the file in
1875 * the work tree has that object contents, return true, so that
1876 * prepare_temp_file() does not have to inflate and extract.
1877 */
1878 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1879 {
1880 struct cache_entry *ce;
1881 struct stat st;
1882 int pos, len;
1883
1884 /*
1885 * We do not read the cache ourselves here, because the
1886 * benchmark with my previous version that always reads cache
1887 * shows that it makes things worse for diff-tree comparing
1888 * two linux-2.6 kernel trees in an already checked out work
1889 * tree. This is because most diff-tree comparisons deal with
1890 * only a small number of files, while reading the cache is
1891 * expensive for a large project, and its cost outweighs the
1892 * savings we get by not inflating the object to a temporary
1893 * file. Practically, this code only helps when we are used
1894 * by diff-cache --cached, which does read the cache before
1895 * calling us.
1896 */
1897 if (!active_cache)
1898 return 0;
1899
1900 /* We want to avoid the working directory if our caller
1901 * doesn't need the data in a normal file, this system
1902 * is rather slow with its stat/open/mmap/close syscalls,
1903 * and the object is contained in a pack file. The pack
1904 * is probably already open and will be faster to obtain
1905 * the data through than the working directory. Loose
1906 * objects however would tend to be slower as they need
1907 * to be individually opened and inflated.
1908 */
1909 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
1910 return 0;
1911
1912 len = strlen(name);
1913 pos = cache_name_pos(name, len);
1914 if (pos < 0)
1915 return 0;
1916 ce = active_cache[pos];
1917
1918 /*
1919 * This is not the sha1 we are looking for, or
1920 * unreusable because it is not a regular file.
1921 */
1922 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1923 return 0;
1924
1925 /*
1926 * If ce is marked as "assume unchanged", there is no
1927 * guarantee that work tree matches what we are looking for.
1928 */
1929 if (ce->ce_flags & CE_VALID)
1930 return 0;
1931
1932 /*
1933 * If ce matches the file in the work tree, we can reuse it.
1934 */
1935 if (ce_uptodate(ce) ||
1936 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1937 return 1;
1938
1939 return 0;
1940 }
1941
1942 static int populate_from_stdin(struct diff_filespec *s)
1943 {
1944 struct strbuf buf = STRBUF_INIT;
1945 size_t size = 0;
1946
1947 if (strbuf_read(&buf, 0, 0) < 0)
1948 return error("error while reading from stdin %s",
1949 strerror(errno));
1950
1951 s->should_munmap = 0;
1952 s->data = strbuf_detach(&buf, &size);
1953 s->size = size;
1954 s->should_free = 1;
1955 return 0;
1956 }
1957
1958 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1959 {
1960 int len;
1961 char *data = xmalloc(100);
1962 len = snprintf(data, 100,
1963 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1964 s->data = data;
1965 s->size = len;
1966 s->should_free = 1;
1967 if (size_only) {
1968 s->data = NULL;
1969 free(data);
1970 }
1971 return 0;
1972 }
1973
1974 /*
1975 * While doing rename detection and pickaxe operation, we may need to
1976 * grab the data for the blob (or file) for our own in-core comparison.
1977 * diff_filespec has data and size fields for this purpose.
1978 */
1979 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1980 {
1981 int err = 0;
1982 if (!DIFF_FILE_VALID(s))
1983 die("internal error: asking to populate invalid file.");
1984 if (S_ISDIR(s->mode))
1985 return -1;
1986
1987 if (s->data)
1988 return 0;
1989
1990 if (size_only && 0 < s->size)
1991 return 0;
1992
1993 if (S_ISGITLINK(s->mode))
1994 return diff_populate_gitlink(s, size_only);
1995
1996 if (!s->sha1_valid ||
1997 reuse_worktree_file(s->path, s->sha1, 0)) {
1998 struct strbuf buf = STRBUF_INIT;
1999 struct stat st;
2000 int fd;
2001
2002 if (!strcmp(s->path, "-"))
2003 return populate_from_stdin(s);
2004
2005 if (lstat(s->path, &st) < 0) {
2006 if (errno == ENOENT) {
2007 err_empty:
2008 err = -1;
2009 empty:
2010 s->data = (char *)"";
2011 s->size = 0;
2012 return err;
2013 }
2014 }
2015 s->size = xsize_t(st.st_size);
2016 if (!s->size)
2017 goto empty;
2018 if (S_ISLNK(st.st_mode)) {
2019 struct strbuf sb = STRBUF_INIT;
2020
2021 if (strbuf_readlink(&sb, s->path, s->size))
2022 goto err_empty;
2023 s->size = sb.len;
2024 s->data = strbuf_detach(&sb, NULL);
2025 s->should_free = 1;
2026 return 0;
2027 }
2028 if (size_only)
2029 return 0;
2030 fd = open(s->path, O_RDONLY);
2031 if (fd < 0)
2032 goto err_empty;
2033 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2034 close(fd);
2035 s->should_munmap = 1;
2036
2037 /*
2038 * Convert from working tree format to canonical git format
2039 */
2040 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2041 size_t size = 0;
2042 munmap(s->data, s->size);
2043 s->should_munmap = 0;
2044 s->data = strbuf_detach(&buf, &size);
2045 s->size = size;
2046 s->should_free = 1;
2047 }
2048 }
2049 else {
2050 enum object_type type;
2051 if (size_only)
2052 type = sha1_object_info(s->sha1, &s->size);
2053 else {
2054 s->data = read_sha1_file(s->sha1, &type, &s->size);
2055 s->should_free = 1;
2056 }
2057 }
2058 return 0;
2059 }
2060
2061 void diff_free_filespec_blob(struct diff_filespec *s)
2062 {
2063 if (s->should_free)
2064 free(s->data);
2065 else if (s->should_munmap)
2066 munmap(s->data, s->size);
2067
2068 if (s->should_free || s->should_munmap) {
2069 s->should_free = s->should_munmap = 0;
2070 s->data = NULL;
2071 }
2072 }
2073
2074 void diff_free_filespec_data(struct diff_filespec *s)
2075 {
2076 diff_free_filespec_blob(s);
2077 free(s->cnt_data);
2078 s->cnt_data = NULL;
2079 }
2080
2081 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2082 void *blob,
2083 unsigned long size,
2084 const unsigned char *sha1,
2085 int mode)
2086 {
2087 int fd;
2088 struct strbuf buf = STRBUF_INIT;
2089 struct strbuf template = STRBUF_INIT;
2090 char *path_dup = xstrdup(path);
2091 const char *base = basename(path_dup);
2092
2093 /* Generate "XXXXXX_basename.ext" */
2094 strbuf_addstr(&template, "XXXXXX_");
2095 strbuf_addstr(&template, base);
2096
2097 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2098 strlen(base) + 1);
2099 if (fd < 0)
2100 die_errno("unable to create temp-file");
2101 if (convert_to_working_tree(path,
2102 (const char *)blob, (size_t)size, &buf)) {
2103 blob = buf.buf;
2104 size = buf.len;
2105 }
2106 if (write_in_full(fd, blob, size) != size)
2107 die_errno("unable to write temp-file");
2108 close(fd);
2109 temp->name = temp->tmp_path;
2110 strcpy(temp->hex, sha1_to_hex(sha1));
2111 temp->hex[40] = 0;
2112 sprintf(temp->mode, "%06o", mode);
2113 strbuf_release(&buf);
2114 strbuf_release(&template);
2115 free(path_dup);
2116 }
2117
2118 static struct diff_tempfile *prepare_temp_file(const char *name,
2119 struct diff_filespec *one)
2120 {
2121 struct diff_tempfile *temp = claim_diff_tempfile();
2122
2123 if (!DIFF_FILE_VALID(one)) {
2124 not_a_valid_file:
2125 /* A '-' entry produces this for file-2, and
2126 * a '+' entry produces this for file-1.
2127 */
2128 temp->name = "/dev/null";
2129 strcpy(temp->hex, ".");
2130 strcpy(temp->mode, ".");
2131 return temp;
2132 }
2133
2134 if (!remove_tempfile_installed) {
2135 atexit(remove_tempfile);
2136 sigchain_push_common(remove_tempfile_on_signal);
2137 remove_tempfile_installed = 1;
2138 }
2139
2140 if (!one->sha1_valid ||
2141 reuse_worktree_file(name, one->sha1, 1)) {
2142 struct stat st;
2143 if (lstat(name, &st) < 0) {
2144 if (errno == ENOENT)
2145 goto not_a_valid_file;
2146 die_errno("stat(%s)", name);
2147 }
2148 if (S_ISLNK(st.st_mode)) {
2149 struct strbuf sb = STRBUF_INIT;
2150 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2151 die_errno("readlink(%s)", name);
2152 prep_temp_blob(name, temp, sb.buf, sb.len,
2153 (one->sha1_valid ?
2154 one->sha1 : null_sha1),
2155 (one->sha1_valid ?
2156 one->mode : S_IFLNK));
2157 strbuf_release(&sb);
2158 }
2159 else {
2160 /* we can borrow from the file in the work tree */
2161 temp->name = name;
2162 if (!one->sha1_valid)
2163 strcpy(temp->hex, sha1_to_hex(null_sha1));
2164 else
2165 strcpy(temp->hex, sha1_to_hex(one->sha1));
2166 /* Even though we may sometimes borrow the
2167 * contents from the work tree, we always want
2168 * one->mode. mode is trustworthy even when
2169 * !(one->sha1_valid), as long as
2170 * DIFF_FILE_VALID(one).
2171 */
2172 sprintf(temp->mode, "%06o", one->mode);
2173 }
2174 return temp;
2175 }
2176 else {
2177 if (diff_populate_filespec(one, 0))
2178 die("cannot read data blob for %s", one->path);
2179 prep_temp_blob(name, temp, one->data, one->size,
2180 one->sha1, one->mode);
2181 }
2182 return temp;
2183 }
2184
2185 /* An external diff command takes:
2186 *
2187 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2188 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2189 *
2190 */
2191 static void run_external_diff(const char *pgm,
2192 const char *name,
2193 const char *other,
2194 struct diff_filespec *one,
2195 struct diff_filespec *two,
2196 const char *xfrm_msg,
2197 int complete_rewrite)
2198 {
2199 const char *spawn_arg[10];
2200 int retval;
2201 const char **arg = &spawn_arg[0];
2202
2203 if (one && two) {
2204 struct diff_tempfile *temp_one, *temp_two;
2205 const char *othername = (other ? other : name);
2206 temp_one = prepare_temp_file(name, one);
2207 temp_two = prepare_temp_file(othername, two);
2208 *arg++ = pgm;
2209 *arg++ = name;
2210 *arg++ = temp_one->name;
2211 *arg++ = temp_one->hex;
2212 *arg++ = temp_one->mode;
2213 *arg++ = temp_two->name;
2214 *arg++ = temp_two->hex;
2215 *arg++ = temp_two->mode;
2216 if (other) {
2217 *arg++ = other;
2218 *arg++ = xfrm_msg;
2219 }
2220 } else {
2221 *arg++ = pgm;
2222 *arg++ = name;
2223 }
2224 *arg = NULL;
2225 fflush(NULL);
2226 retval = run_command_v_opt(spawn_arg, 0);
2227 remove_tempfile();
2228 if (retval) {
2229 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2230 exit(1);
2231 }
2232 }
2233
2234 static int similarity_index(struct diff_filepair *p)
2235 {
2236 return p->score * 100 / MAX_SCORE;
2237 }
2238
2239 static void fill_metainfo(struct strbuf *msg,
2240 const char *name,
2241 const char *other,
2242 struct diff_filespec *one,
2243 struct diff_filespec *two,
2244 struct diff_options *o,
2245 struct diff_filepair *p)
2246 {
2247 strbuf_init(msg, PATH_MAX * 2 + 300);
2248 switch (p->status) {
2249 case DIFF_STATUS_COPIED:
2250 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2251 strbuf_addstr(msg, "\ncopy from ");
2252 quote_c_style(name, msg, NULL, 0);
2253 strbuf_addstr(msg, "\ncopy to ");
2254 quote_c_style(other, msg, NULL, 0);
2255 strbuf_addch(msg, '\n');
2256 break;
2257 case DIFF_STATUS_RENAMED:
2258 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2259 strbuf_addstr(msg, "\nrename from ");
2260 quote_c_style(name, msg, NULL, 0);
2261 strbuf_addstr(msg, "\nrename to ");
2262 quote_c_style(other, msg, NULL, 0);
2263 strbuf_addch(msg, '\n');
2264 break;
2265 case DIFF_STATUS_MODIFIED:
2266 if (p->score) {
2267 strbuf_addf(msg, "dissimilarity index %d%%\n",
2268 similarity_index(p));
2269 break;
2270 }
2271 /* fallthru */
2272 default:
2273 /* nothing */
2274 ;
2275 }
2276 if (one && two && hashcmp(one->sha1, two->sha1)) {
2277 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2278
2279 if (DIFF_OPT_TST(o, BINARY)) {
2280 mmfile_t mf;
2281 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2282 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2283 abbrev = 40;
2284 }
2285 strbuf_addf(msg, "index %.*s..%.*s",
2286 abbrev, sha1_to_hex(one->sha1),
2287 abbrev, sha1_to_hex(two->sha1));
2288 if (one->mode == two->mode)
2289 strbuf_addf(msg, " %06o", one->mode);
2290 strbuf_addch(msg, '\n');
2291 }
2292 if (msg->len)
2293 strbuf_setlen(msg, msg->len - 1);
2294 }
2295
2296 static void run_diff_cmd(const char *pgm,
2297 const char *name,
2298 const char *other,
2299 const char *attr_path,
2300 struct diff_filespec *one,
2301 struct diff_filespec *two,
2302 struct strbuf *msg,
2303 struct diff_options *o,
2304 struct diff_filepair *p)
2305 {
2306 const char *xfrm_msg = NULL;
2307 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2308
2309 if (msg) {
2310 fill_metainfo(msg, name, other, one, two, o, p);
2311 xfrm_msg = msg->len ? msg->buf : NULL;
2312 }
2313
2314 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2315 pgm = NULL;
2316 else {
2317 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2318 if (drv && drv->external)
2319 pgm = drv->external;
2320 }
2321
2322 if (pgm) {
2323 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2324 complete_rewrite);
2325 return;
2326 }
2327 if (one && two)
2328 builtin_diff(name, other ? other : name,
2329 one, two, xfrm_msg, o, complete_rewrite);
2330 else
2331 fprintf(o->file, "* Unmerged path %s\n", name);
2332 }
2333
2334 static void diff_fill_sha1_info(struct diff_filespec *one)
2335 {
2336 if (DIFF_FILE_VALID(one)) {
2337 if (!one->sha1_valid) {
2338 struct stat st;
2339 if (!strcmp(one->path, "-")) {
2340 hashcpy(one->sha1, null_sha1);
2341 return;
2342 }
2343 if (lstat(one->path, &st) < 0)
2344 die_errno("stat '%s'", one->path);
2345 if (index_path(one->sha1, one->path, &st, 0))
2346 die("cannot hash %s", one->path);
2347 }
2348 }
2349 else
2350 hashclr(one->sha1);
2351 }
2352
2353 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2354 {
2355 /* Strip the prefix but do not molest /dev/null and absolute paths */
2356 if (*namep && **namep != '/')
2357 *namep += prefix_length;
2358 if (*otherp && **otherp != '/')
2359 *otherp += prefix_length;
2360 }
2361
2362 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2363 {
2364 const char *pgm = external_diff();
2365 struct strbuf msg;
2366 struct diff_filespec *one = p->one;
2367 struct diff_filespec *two = p->two;
2368 const char *name;
2369 const char *other;
2370 const char *attr_path;
2371
2372 name = p->one->path;
2373 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2374 attr_path = name;
2375 if (o->prefix_length)
2376 strip_prefix(o->prefix_length, &name, &other);
2377
2378 if (DIFF_PAIR_UNMERGED(p)) {
2379 run_diff_cmd(pgm, name, NULL, attr_path,
2380 NULL, NULL, NULL, o, p);
2381 return;
2382 }
2383
2384 diff_fill_sha1_info(one);
2385 diff_fill_sha1_info(two);
2386
2387 if (!pgm &&
2388 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2389 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2390 /*
2391 * a filepair that changes between file and symlink
2392 * needs to be split into deletion and creation.
2393 */
2394 struct diff_filespec *null = alloc_filespec(two->path);
2395 run_diff_cmd(NULL, name, other, attr_path,
2396 one, null, &msg, o, p);
2397 free(null);
2398 strbuf_release(&msg);
2399
2400 null = alloc_filespec(one->path);
2401 run_diff_cmd(NULL, name, other, attr_path,
2402 null, two, &msg, o, p);
2403 free(null);
2404 }
2405 else
2406 run_diff_cmd(pgm, name, other, attr_path,
2407 one, two, &msg, o, p);
2408
2409 strbuf_release(&msg);
2410 }
2411
2412 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2413 struct diffstat_t *diffstat)
2414 {
2415 const char *name;
2416 const char *other;
2417 int complete_rewrite = 0;
2418
2419 if (DIFF_PAIR_UNMERGED(p)) {
2420 /* unmerged */
2421 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2422 return;
2423 }
2424
2425 name = p->one->path;
2426 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2427
2428 if (o->prefix_length)
2429 strip_prefix(o->prefix_length, &name, &other);
2430
2431 diff_fill_sha1_info(p->one);
2432 diff_fill_sha1_info(p->two);
2433
2434 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2435 complete_rewrite = 1;
2436 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2437 }
2438
2439 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2440 {
2441 const char *name;
2442 const char *other;
2443 const char *attr_path;
2444
2445 if (DIFF_PAIR_UNMERGED(p)) {
2446 /* unmerged */
2447 return;
2448 }
2449
2450 name = p->one->path;
2451 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2452 attr_path = other ? other : name;
2453
2454 if (o->prefix_length)
2455 strip_prefix(o->prefix_length, &name, &other);
2456
2457 diff_fill_sha1_info(p->one);
2458 diff_fill_sha1_info(p->two);
2459
2460 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2461 }
2462
2463 void diff_setup(struct diff_options *options)
2464 {
2465 memset(options, 0, sizeof(*options));
2466
2467 options->file = stdout;
2468
2469 options->line_termination = '\n';
2470 options->break_opt = -1;
2471 options->rename_limit = -1;
2472 options->dirstat_percent = 3;
2473 options->context = 3;
2474
2475 options->change = diff_change;
2476 options->add_remove = diff_addremove;
2477 if (diff_use_color_default > 0)
2478 DIFF_OPT_SET(options, COLOR_DIFF);
2479 options->detect_rename = diff_detect_rename_default;
2480
2481 if (!diff_mnemonic_prefix) {
2482 options->a_prefix = "a/";
2483 options->b_prefix = "b/";
2484 }
2485 }
2486
2487 int diff_setup_done(struct diff_options *options)
2488 {
2489 int count = 0;
2490
2491 if (options->output_format & DIFF_FORMAT_NAME)
2492 count++;
2493 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2494 count++;
2495 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2496 count++;
2497 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2498 count++;
2499 if (count > 1)
2500 die("--name-only, --name-status, --check and -s are mutually exclusive");
2501
2502 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2503 options->detect_rename = DIFF_DETECT_COPY;
2504
2505 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2506 options->prefix = NULL;
2507 if (options->prefix)
2508 options->prefix_length = strlen(options->prefix);
2509 else
2510 options->prefix_length = 0;
2511
2512 if (options->output_format & (DIFF_FORMAT_NAME |
2513 DIFF_FORMAT_NAME_STATUS |
2514 DIFF_FORMAT_CHECKDIFF |
2515 DIFF_FORMAT_NO_OUTPUT))
2516 options->output_format &= ~(DIFF_FORMAT_RAW |
2517 DIFF_FORMAT_NUMSTAT |
2518 DIFF_FORMAT_DIFFSTAT |
2519 DIFF_FORMAT_SHORTSTAT |
2520 DIFF_FORMAT_DIRSTAT |
2521 DIFF_FORMAT_SUMMARY |
2522 DIFF_FORMAT_PATCH);
2523
2524 /*
2525 * These cases always need recursive; we do not drop caller-supplied
2526 * recursive bits for other formats here.
2527 */
2528 if (options->output_format & (DIFF_FORMAT_PATCH |
2529 DIFF_FORMAT_NUMSTAT |
2530 DIFF_FORMAT_DIFFSTAT |
2531 DIFF_FORMAT_SHORTSTAT |
2532 DIFF_FORMAT_DIRSTAT |
2533 DIFF_FORMAT_SUMMARY |
2534 DIFF_FORMAT_CHECKDIFF))
2535 DIFF_OPT_SET(options, RECURSIVE);
2536 /*
2537 * Also pickaxe would not work very well if you do not say recursive
2538 */
2539 if (options->pickaxe)
2540 DIFF_OPT_SET(options, RECURSIVE);
2541
2542 if (options->detect_rename && options->rename_limit < 0)
2543 options->rename_limit = diff_rename_limit_default;
2544 if (options->setup & DIFF_SETUP_USE_CACHE) {
2545 if (!active_cache)
2546 /* read-cache does not die even when it fails
2547 * so it is safe for us to do this here. Also
2548 * it does not smudge active_cache or active_nr
2549 * when it fails, so we do not have to worry about
2550 * cleaning it up ourselves either.
2551 */
2552 read_cache();
2553 }
2554 if (options->abbrev <= 0 || 40 < options->abbrev)
2555 options->abbrev = 40; /* full */
2556
2557 /*
2558 * It does not make sense to show the first hit we happened
2559 * to have found. It does not make sense not to return with
2560 * exit code in such a case either.
2561 */
2562 if (DIFF_OPT_TST(options, QUIET)) {
2563 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2564 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2565 }
2566
2567 return 0;
2568 }
2569
2570 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2571 {
2572 char c, *eq;
2573 int len;
2574
2575 if (*arg != '-')
2576 return 0;
2577 c = *++arg;
2578 if (!c)
2579 return 0;
2580 if (c == arg_short) {
2581 c = *++arg;
2582 if (!c)
2583 return 1;
2584 if (val && isdigit(c)) {
2585 char *end;
2586 int n = strtoul(arg, &end, 10);
2587 if (*end)
2588 return 0;
2589 *val = n;
2590 return 1;
2591 }
2592 return 0;
2593 }
2594 if (c != '-')
2595 return 0;
2596 arg++;
2597 eq = strchr(arg, '=');
2598 if (eq)
2599 len = eq - arg;
2600 else
2601 len = strlen(arg);
2602 if (!len || strncmp(arg, arg_long, len))
2603 return 0;
2604 if (eq) {
2605 int n;
2606 char *end;
2607 if (!isdigit(*++eq))
2608 return 0;
2609 n = strtoul(eq, &end, 10);
2610 if (*end)
2611 return 0;
2612 *val = n;
2613 }
2614 return 1;
2615 }
2616
2617 static int diff_scoreopt_parse(const char *opt);
2618
2619 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2620 {
2621 const char *arg = av[0];
2622
2623 /* Output format options */
2624 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2625 options->output_format |= DIFF_FORMAT_PATCH;
2626 else if (opt_arg(arg, 'U', "unified", &options->context))
2627 options->output_format |= DIFF_FORMAT_PATCH;
2628 else if (!strcmp(arg, "--raw"))
2629 options->output_format |= DIFF_FORMAT_RAW;
2630 else if (!strcmp(arg, "--patch-with-raw"))
2631 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2632 else if (!strcmp(arg, "--numstat"))
2633 options->output_format |= DIFF_FORMAT_NUMSTAT;
2634 else if (!strcmp(arg, "--shortstat"))
2635 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2636 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2637 options->output_format |= DIFF_FORMAT_DIRSTAT;
2638 else if (!strcmp(arg, "--cumulative")) {
2639 options->output_format |= DIFF_FORMAT_DIRSTAT;
2640 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
2641 } else if (opt_arg(arg, 0, "dirstat-by-file",
2642 &options->dirstat_percent)) {
2643 options->output_format |= DIFF_FORMAT_DIRSTAT;
2644 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
2645 }
2646 else if (!strcmp(arg, "--check"))
2647 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2648 else if (!strcmp(arg, "--summary"))
2649 options->output_format |= DIFF_FORMAT_SUMMARY;
2650 else if (!strcmp(arg, "--patch-with-stat"))
2651 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2652 else if (!strcmp(arg, "--name-only"))
2653 options->output_format |= DIFF_FORMAT_NAME;
2654 else if (!strcmp(arg, "--name-status"))
2655 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2656 else if (!strcmp(arg, "-s"))
2657 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2658 else if (!prefixcmp(arg, "--stat")) {
2659 char *end;
2660 int width = options->stat_width;
2661 int name_width = options->stat_name_width;
2662 arg += 6;
2663 end = (char *)arg;
2664
2665 switch (*arg) {
2666 case '-':
2667 if (!prefixcmp(arg, "-width="))
2668 width = strtoul(arg + 7, &end, 10);
2669 else if (!prefixcmp(arg, "-name-width="))
2670 name_width = strtoul(arg + 12, &end, 10);
2671 break;
2672 case '=':
2673 width = strtoul(arg+1, &end, 10);
2674 if (*end == ',')
2675 name_width = strtoul(end+1, &end, 10);
2676 }
2677
2678 /* Important! This checks all the error cases! */
2679 if (*end)
2680 return 0;
2681 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2682 options->stat_name_width = name_width;
2683 options->stat_width = width;
2684 }
2685
2686 /* renames options */
2687 else if (!prefixcmp(arg, "-B")) {
2688 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2689 return -1;
2690 }
2691 else if (!prefixcmp(arg, "-M")) {
2692 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2693 return -1;
2694 options->detect_rename = DIFF_DETECT_RENAME;
2695 }
2696 else if (!prefixcmp(arg, "-C")) {
2697 if (options->detect_rename == DIFF_DETECT_COPY)
2698 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2699 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2700 return -1;
2701 options->detect_rename = DIFF_DETECT_COPY;
2702 }
2703 else if (!strcmp(arg, "--no-renames"))
2704 options->detect_rename = 0;
2705 else if (!strcmp(arg, "--relative"))
2706 DIFF_OPT_SET(options, RELATIVE_NAME);
2707 else if (!prefixcmp(arg, "--relative=")) {
2708 DIFF_OPT_SET(options, RELATIVE_NAME);
2709 options->prefix = arg + 11;
2710 }
2711
2712 /* xdiff options */
2713 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2714 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
2715 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2716 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
2717 else if (!strcmp(arg, "--ignore-space-at-eol"))
2718 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
2719 else if (!strcmp(arg, "--patience"))
2720 DIFF_XDL_SET(options, PATIENCE_DIFF);
2721
2722 /* flags options */
2723 else if (!strcmp(arg, "--binary")) {
2724 options->output_format |= DIFF_FORMAT_PATCH;
2725 DIFF_OPT_SET(options, BINARY);
2726 }
2727 else if (!strcmp(arg, "--full-index"))
2728 DIFF_OPT_SET(options, FULL_INDEX);
2729 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2730 DIFF_OPT_SET(options, TEXT);
2731 else if (!strcmp(arg, "-R"))
2732 DIFF_OPT_SET(options, REVERSE_DIFF);
2733 else if (!strcmp(arg, "--find-copies-harder"))
2734 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2735 else if (!strcmp(arg, "--follow"))
2736 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2737 else if (!strcmp(arg, "--color"))
2738 DIFF_OPT_SET(options, COLOR_DIFF);
2739 else if (!strcmp(arg, "--no-color"))
2740 DIFF_OPT_CLR(options, COLOR_DIFF);
2741 else if (!strcmp(arg, "--color-words")) {
2742 DIFF_OPT_SET(options, COLOR_DIFF);
2743 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2744 }
2745 else if (!prefixcmp(arg, "--color-words=")) {
2746 DIFF_OPT_SET(options, COLOR_DIFF);
2747 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2748 options->word_regex = arg + 14;
2749 }
2750 else if (!strcmp(arg, "--exit-code"))
2751 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2752 else if (!strcmp(arg, "--quiet"))
2753 DIFF_OPT_SET(options, QUIET);
2754 else if (!strcmp(arg, "--ext-diff"))
2755 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2756 else if (!strcmp(arg, "--no-ext-diff"))
2757 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2758 else if (!strcmp(arg, "--textconv"))
2759 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
2760 else if (!strcmp(arg, "--no-textconv"))
2761 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
2762 else if (!strcmp(arg, "--ignore-submodules"))
2763 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2764
2765 /* misc options */
2766 else if (!strcmp(arg, "-z"))
2767 options->line_termination = 0;
2768 else if (!prefixcmp(arg, "-l"))
2769 options->rename_limit = strtoul(arg+2, NULL, 10);
2770 else if (!prefixcmp(arg, "-S"))
2771 options->pickaxe = arg + 2;
2772 else if (!strcmp(arg, "--pickaxe-all"))
2773 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2774 else if (!strcmp(arg, "--pickaxe-regex"))
2775 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2776 else if (!prefixcmp(arg, "-O"))
2777 options->orderfile = arg + 2;
2778 else if (!prefixcmp(arg, "--diff-filter="))
2779 options->filter = arg + 14;
2780 else if (!strcmp(arg, "--abbrev"))
2781 options->abbrev = DEFAULT_ABBREV;
2782 else if (!prefixcmp(arg, "--abbrev=")) {
2783 options->abbrev = strtoul(arg + 9, NULL, 10);
2784 if (options->abbrev < MINIMUM_ABBREV)
2785 options->abbrev = MINIMUM_ABBREV;
2786 else if (40 < options->abbrev)
2787 options->abbrev = 40;
2788 }
2789 else if (!prefixcmp(arg, "--src-prefix="))
2790 options->a_prefix = arg + 13;
2791 else if (!prefixcmp(arg, "--dst-prefix="))
2792 options->b_prefix = arg + 13;
2793 else if (!strcmp(arg, "--no-prefix"))
2794 options->a_prefix = options->b_prefix = "";
2795 else if (opt_arg(arg, '\0', "inter-hunk-context",
2796 &options->interhunkcontext))
2797 ;
2798 else if (!prefixcmp(arg, "--output=")) {
2799 options->file = fopen(arg + strlen("--output="), "w");
2800 options->close_file = 1;
2801 } else
2802 return 0;
2803 return 1;
2804 }
2805
2806 static int parse_num(const char **cp_p)
2807 {
2808 unsigned long num, scale;
2809 int ch, dot;
2810 const char *cp = *cp_p;
2811
2812 num = 0;
2813 scale = 1;
2814 dot = 0;
2815 for (;;) {
2816 ch = *cp;
2817 if ( !dot && ch == '.' ) {
2818 scale = 1;
2819 dot = 1;
2820 } else if ( ch == '%' ) {
2821 scale = dot ? scale*100 : 100;
2822 cp++; /* % is always at the end */
2823 break;
2824 } else if ( ch >= '0' && ch <= '9' ) {
2825 if ( scale < 100000 ) {
2826 scale *= 10;
2827 num = (num*10) + (ch-'0');
2828 }
2829 } else {
2830 break;
2831 }
2832 cp++;
2833 }
2834 *cp_p = cp;
2835
2836 /* user says num divided by scale and we say internally that
2837 * is MAX_SCORE * num / scale.
2838 */
2839 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2840 }
2841
2842 static int diff_scoreopt_parse(const char *opt)
2843 {
2844 int opt1, opt2, cmd;
2845
2846 if (*opt++ != '-')
2847 return -1;
2848 cmd = *opt++;
2849 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2850 return -1; /* that is not a -M, -C nor -B option */
2851
2852 opt1 = parse_num(&opt);
2853 if (cmd != 'B')
2854 opt2 = 0;
2855 else {
2856 if (*opt == 0)
2857 opt2 = 0;
2858 else if (*opt != '/')
2859 return -1; /* we expect -B80/99 or -B80 */
2860 else {
2861 opt++;
2862 opt2 = parse_num(&opt);
2863 }
2864 }
2865 if (*opt != 0)
2866 return -1;
2867 return opt1 | (opt2 << 16);
2868 }
2869
2870 struct diff_queue_struct diff_queued_diff;
2871
2872 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2873 {
2874 if (queue->alloc <= queue->nr) {
2875 queue->alloc = alloc_nr(queue->alloc);
2876 queue->queue = xrealloc(queue->queue,
2877 sizeof(dp) * queue->alloc);
2878 }
2879 queue->queue[queue->nr++] = dp;
2880 }
2881
2882 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2883 struct diff_filespec *one,
2884 struct diff_filespec *two)
2885 {
2886 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2887 dp->one = one;
2888 dp->two = two;
2889 if (queue)
2890 diff_q(queue, dp);
2891 return dp;
2892 }
2893
2894 void diff_free_filepair(struct diff_filepair *p)
2895 {
2896 free_filespec(p->one);
2897 free_filespec(p->two);
2898 free(p);
2899 }
2900
2901 /* This is different from find_unique_abbrev() in that
2902 * it stuffs the result with dots for alignment.
2903 */
2904 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2905 {
2906 int abblen;
2907 const char *abbrev;
2908 if (len == 40)
2909 return sha1_to_hex(sha1);
2910
2911 abbrev = find_unique_abbrev(sha1, len);
2912 abblen = strlen(abbrev);
2913 if (abblen < 37) {
2914 static char hex[41];
2915 if (len < abblen && abblen <= len + 2)
2916 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2917 else
2918 sprintf(hex, "%s...", abbrev);
2919 return hex;
2920 }
2921 return sha1_to_hex(sha1);
2922 }
2923
2924 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2925 {
2926 int line_termination = opt->line_termination;
2927 int inter_name_termination = line_termination ? '\t' : '\0';
2928
2929 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2930 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2931 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2932 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2933 }
2934 if (p->score) {
2935 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2936 inter_name_termination);
2937 } else {
2938 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
2939 }
2940
2941 if (p->status == DIFF_STATUS_COPIED ||
2942 p->status == DIFF_STATUS_RENAMED) {
2943 const char *name_a, *name_b;
2944 name_a = p->one->path;
2945 name_b = p->two->path;
2946 strip_prefix(opt->prefix_length, &name_a, &name_b);
2947 write_name_quoted(name_a, opt->file, inter_name_termination);
2948 write_name_quoted(name_b, opt->file, line_termination);
2949 } else {
2950 const char *name_a, *name_b;
2951 name_a = p->one->mode ? p->one->path : p->two->path;
2952 name_b = NULL;
2953 strip_prefix(opt->prefix_length, &name_a, &name_b);
2954 write_name_quoted(name_a, opt->file, line_termination);
2955 }
2956 }
2957
2958 int diff_unmodified_pair(struct diff_filepair *p)
2959 {
2960 /* This function is written stricter than necessary to support
2961 * the currently implemented transformers, but the idea is to
2962 * let transformers to produce diff_filepairs any way they want,
2963 * and filter and clean them up here before producing the output.
2964 */
2965 struct diff_filespec *one = p->one, *two = p->two;
2966
2967 if (DIFF_PAIR_UNMERGED(p))
2968 return 0; /* unmerged is interesting */
2969
2970 /* deletion, addition, mode or type change
2971 * and rename are all interesting.
2972 */
2973 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2974 DIFF_PAIR_MODE_CHANGED(p) ||
2975 strcmp(one->path, two->path))
2976 return 0;
2977
2978 /* both are valid and point at the same path. that is, we are
2979 * dealing with a change.
2980 */
2981 if (one->sha1_valid && two->sha1_valid &&
2982 !hashcmp(one->sha1, two->sha1))
2983 return 1; /* no change */
2984 if (!one->sha1_valid && !two->sha1_valid)
2985 return 1; /* both look at the same file on the filesystem. */
2986 return 0;
2987 }
2988
2989 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2990 {
2991 if (diff_unmodified_pair(p))
2992 return;
2993
2994 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2995 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2996 return; /* no tree diffs in patch format */
2997
2998 run_diff(p, o);
2999 }
3000
3001 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3002 struct diffstat_t *diffstat)
3003 {
3004 if (diff_unmodified_pair(p))
3005 return;
3006
3007 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3008 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3009 return; /* no tree diffs in patch format */
3010
3011 run_diffstat(p, o, diffstat);
3012 }
3013
3014 static void diff_flush_checkdiff(struct diff_filepair *p,
3015 struct diff_options *o)
3016 {
3017 if (diff_unmodified_pair(p))
3018 return;
3019
3020 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3021 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3022 return; /* no tree diffs in patch format */
3023
3024 run_checkdiff(p, o);
3025 }
3026
3027 int diff_queue_is_empty(void)
3028 {
3029 struct diff_queue_struct *q = &diff_queued_diff;
3030 int i;
3031 for (i = 0; i < q->nr; i++)
3032 if (!diff_unmodified_pair(q->queue[i]))
3033 return 0;
3034 return 1;
3035 }
3036
3037 #if DIFF_DEBUG
3038 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3039 {
3040 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3041 x, one ? one : "",
3042 s->path,
3043 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3044 s->mode,
3045 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3046 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3047 x, one ? one : "",
3048 s->size, s->xfrm_flags);
3049 }
3050
3051 void diff_debug_filepair(const struct diff_filepair *p, int i)
3052 {
3053 diff_debug_filespec(p->one, i, "one");
3054 diff_debug_filespec(p->two, i, "two");
3055 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3056 p->score, p->status ? p->status : '?',
3057 p->one->rename_used, p->broken_pair);
3058 }
3059
3060 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3061 {
3062 int i;
3063 if (msg)
3064 fprintf(stderr, "%s\n", msg);
3065 fprintf(stderr, "q->nr = %d\n", q->nr);
3066 for (i = 0; i < q->nr; i++) {
3067 struct diff_filepair *p = q->queue[i];
3068 diff_debug_filepair(p, i);
3069 }
3070 }
3071 #endif
3072
3073 static void diff_resolve_rename_copy(void)
3074 {
3075 int i;
3076 struct diff_filepair *p;
3077 struct diff_queue_struct *q = &diff_queued_diff;
3078
3079 diff_debug_queue("resolve-rename-copy", q);
3080
3081 for (i = 0; i < q->nr; i++) {
3082 p = q->queue[i];
3083 p->status = 0; /* undecided */
3084 if (DIFF_PAIR_UNMERGED(p))
3085 p->status = DIFF_STATUS_UNMERGED;
3086 else if (!DIFF_FILE_VALID(p->one))
3087 p->status = DIFF_STATUS_ADDED;
3088 else if (!DIFF_FILE_VALID(p->two))
3089 p->status = DIFF_STATUS_DELETED;
3090 else if (DIFF_PAIR_TYPE_CHANGED(p))
3091 p->status = DIFF_STATUS_TYPE_CHANGED;
3092
3093 /* from this point on, we are dealing with a pair
3094 * whose both sides are valid and of the same type, i.e.
3095 * either in-place edit or rename/copy edit.
3096 */
3097 else if (DIFF_PAIR_RENAME(p)) {
3098 /*
3099 * A rename might have re-connected a broken
3100 * pair up, causing the pathnames to be the
3101 * same again. If so, that's not a rename at
3102 * all, just a modification..
3103 *
3104 * Otherwise, see if this source was used for
3105 * multiple renames, in which case we decrement
3106 * the count, and call it a copy.
3107 */
3108 if (!strcmp(p->one->path, p->two->path))
3109 p->status = DIFF_STATUS_MODIFIED;
3110 else if (--p->one->rename_used > 0)
3111 p->status = DIFF_STATUS_COPIED;
3112 else
3113 p->status = DIFF_STATUS_RENAMED;
3114 }
3115 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3116 p->one->mode != p->two->mode ||
3117 is_null_sha1(p->one->sha1))
3118 p->status = DIFF_STATUS_MODIFIED;
3119 else {
3120 /* This is a "no-change" entry and should not
3121 * happen anymore, but prepare for broken callers.
3122 */
3123 error("feeding unmodified %s to diffcore",
3124 p->one->path);
3125 p->status = DIFF_STATUS_UNKNOWN;
3126 }
3127 }
3128 diff_debug_queue("resolve-rename-copy done", q);
3129 }
3130
3131 static int check_pair_status(struct diff_filepair *p)
3132 {
3133 switch (p->status) {
3134 case DIFF_STATUS_UNKNOWN:
3135 return 0;
3136 case 0:
3137 die("internal error in diff-resolve-rename-copy");
3138 default:
3139 return 1;
3140 }
3141 }
3142
3143 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3144 {
3145 int fmt = opt->output_format;
3146
3147 if (fmt & DIFF_FORMAT_CHECKDIFF)
3148 diff_flush_checkdiff(p, opt);
3149 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3150 diff_flush_raw(p, opt);
3151 else if (fmt & DIFF_FORMAT_NAME) {
3152 const char *name_a, *name_b;
3153 name_a = p->two->path;
3154 name_b = NULL;
3155 strip_prefix(opt->prefix_length, &name_a, &name_b);
3156 write_name_quoted(name_a, opt->file, opt->line_termination);
3157 }
3158 }
3159
3160 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3161 {
3162 if (fs->mode)
3163 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3164 else
3165 fprintf(file, " %s ", newdelete);
3166 write_name_quoted(fs->path, file, '\n');
3167 }
3168
3169
3170 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
3171 {
3172 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3173 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
3174 show_name ? ' ' : '\n');
3175 if (show_name) {
3176 write_name_quoted(p->two->path, file, '\n');
3177 }
3178 }
3179 }
3180
3181 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
3182 {
3183 char *names = pprint_rename(p->one->path, p->two->path);
3184
3185 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3186 free(names);
3187 show_mode_change(file, p, 0);
3188 }
3189
3190 static void diff_summary(FILE *file, struct diff_filepair *p)
3191 {
3192 switch(p->status) {
3193 case DIFF_STATUS_DELETED:
3194 show_file_mode_name(file, "delete", p->one);
3195 break;
3196 case DIFF_STATUS_ADDED:
3197 show_file_mode_name(file, "create", p->two);
3198 break;
3199 case DIFF_STATUS_COPIED:
3200 show_rename_copy(file, "copy", p);
3201 break;
3202 case DIFF_STATUS_RENAMED:
3203 show_rename_copy(file, "rename", p);
3204 break;
3205 default:
3206 if (p->score) {
3207 fputs(" rewrite ", file);
3208 write_name_quoted(p->two->path, file, ' ');
3209 fprintf(file, "(%d%%)\n", similarity_index(p));
3210 }
3211 show_mode_change(file, p, !p->score);
3212 break;
3213 }
3214 }
3215
3216 struct patch_id_t {
3217 git_SHA_CTX *ctx;
3218 int patchlen;
3219 };
3220
3221 static int remove_space(char *line, int len)
3222 {
3223 int i;
3224 char *dst = line;
3225 unsigned char c;
3226
3227 for (i = 0; i < len; i++)
3228 if (!isspace((c = line[i])))
3229 *dst++ = c;
3230
3231 return dst - line;
3232 }
3233
3234 static void patch_id_consume(void *priv, char *line, unsigned long len)
3235 {
3236 struct patch_id_t *data = priv;
3237 int new_len;
3238
3239 /* Ignore line numbers when computing the SHA1 of the patch */
3240 if (!prefixcmp(line, "@@ -"))
3241 return;
3242
3243 new_len = remove_space(line, len);
3244
3245 git_SHA1_Update(data->ctx, line, new_len);
3246 data->patchlen += new_len;
3247 }
3248
3249 /* returns 0 upon success, and writes result into sha1 */
3250 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3251 {
3252 struct diff_queue_struct *q = &diff_queued_diff;
3253 int i;
3254 git_SHA_CTX ctx;
3255 struct patch_id_t data;
3256 char buffer[PATH_MAX * 4 + 20];
3257
3258 git_SHA1_Init(&ctx);
3259 memset(&data, 0, sizeof(struct patch_id_t));
3260 data.ctx = &ctx;
3261
3262 for (i = 0; i < q->nr; i++) {
3263 xpparam_t xpp;
3264 xdemitconf_t xecfg;
3265 xdemitcb_t ecb;
3266 mmfile_t mf1, mf2;
3267 struct diff_filepair *p = q->queue[i];
3268 int len1, len2;
3269
3270 memset(&xpp, 0, sizeof(xpp));
3271 memset(&xecfg, 0, sizeof(xecfg));
3272 if (p->status == 0)
3273 return error("internal diff status error");
3274 if (p->status == DIFF_STATUS_UNKNOWN)
3275 continue;
3276 if (diff_unmodified_pair(p))
3277 continue;
3278 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3279 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3280 continue;
3281 if (DIFF_PAIR_UNMERGED(p))
3282 continue;
3283
3284 diff_fill_sha1_info(p->one);
3285 diff_fill_sha1_info(p->two);
3286 if (fill_mmfile(&mf1, p->one) < 0 ||
3287 fill_mmfile(&mf2, p->two) < 0)
3288 return error("unable to read files to diff");
3289
3290 len1 = remove_space(p->one->path, strlen(p->one->path));
3291 len2 = remove_space(p->two->path, strlen(p->two->path));
3292 if (p->one->mode == 0)
3293 len1 = snprintf(buffer, sizeof(buffer),
3294 "diff--gita/%.*sb/%.*s"
3295 "newfilemode%06o"
3296 "---/dev/null"
3297 "+++b/%.*s",
3298 len1, p->one->path,
3299 len2, p->two->path,
3300 p->two->mode,
3301 len2, p->two->path);
3302 else if (p->two->mode == 0)
3303 len1 = snprintf(buffer, sizeof(buffer),
3304 "diff--gita/%.*sb/%.*s"
3305 "deletedfilemode%06o"
3306 "---a/%.*s"
3307 "+++/dev/null",
3308 len1, p->one->path,
3309 len2, p->two->path,
3310 p->one->mode,
3311 len1, p->one->path);
3312 else
3313 len1 = snprintf(buffer, sizeof(buffer),
3314 "diff--gita/%.*sb/%.*s"
3315 "---a/%.*s"
3316 "+++b/%.*s",
3317 len1, p->one->path,
3318 len2, p->two->path,
3319 len1, p->one->path,
3320 len2, p->two->path);
3321 git_SHA1_Update(&ctx, buffer, len1);
3322
3323 xpp.flags = XDF_NEED_MINIMAL;
3324 xecfg.ctxlen = 3;
3325 xecfg.flags = XDL_EMIT_FUNCNAMES;
3326 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3327 &xpp, &xecfg, &ecb);
3328 }
3329
3330 git_SHA1_Final(sha1, &ctx);
3331 return 0;
3332 }
3333
3334 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3335 {
3336 struct diff_queue_struct *q = &diff_queued_diff;
3337 int i;
3338 int result = diff_get_patch_id(options, sha1);
3339
3340 for (i = 0; i < q->nr; i++)
3341 diff_free_filepair(q->queue[i]);
3342
3343 free(q->queue);
3344 q->queue = NULL;
3345 q->nr = q->alloc = 0;
3346
3347 return result;
3348 }
3349
3350 static int is_summary_empty(const struct diff_queue_struct *q)
3351 {
3352 int i;
3353
3354 for (i = 0; i < q->nr; i++) {
3355 const struct diff_filepair *p = q->queue[i];
3356
3357 switch (p->status) {
3358 case DIFF_STATUS_DELETED:
3359 case DIFF_STATUS_ADDED:
3360 case DIFF_STATUS_COPIED:
3361 case DIFF_STATUS_RENAMED:
3362 return 0;
3363 default:
3364 if (p->score)
3365 return 0;
3366 if (p->one->mode && p->two->mode &&
3367 p->one->mode != p->two->mode)
3368 return 0;
3369 break;
3370 }
3371 }
3372 return 1;
3373 }
3374
3375 void diff_flush(struct diff_options *options)
3376 {
3377 struct diff_queue_struct *q = &diff_queued_diff;
3378 int i, output_format = options->output_format;
3379 int separator = 0;
3380
3381 /*
3382 * Order: raw, stat, summary, patch
3383 * or: name/name-status/checkdiff (other bits clear)
3384 */
3385 if (!q->nr)
3386 goto free_queue;
3387
3388 if (output_format & (DIFF_FORMAT_RAW |
3389 DIFF_FORMAT_NAME |
3390 DIFF_FORMAT_NAME_STATUS |
3391 DIFF_FORMAT_CHECKDIFF)) {
3392 for (i = 0; i < q->nr; i++) {
3393 struct diff_filepair *p = q->queue[i];
3394 if (check_pair_status(p))
3395 flush_one_pair(p, options);
3396 }
3397 separator++;
3398 }
3399
3400 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3401 struct diffstat_t diffstat;
3402
3403 memset(&diffstat, 0, sizeof(struct diffstat_t));
3404 for (i = 0; i < q->nr; i++) {
3405 struct diff_filepair *p = q->queue[i];
3406 if (check_pair_status(p))
3407 diff_flush_stat(p, options, &diffstat);
3408 }
3409 if (output_format & DIFF_FORMAT_NUMSTAT)
3410 show_numstat(&diffstat, options);
3411 if (output_format & DIFF_FORMAT_DIFFSTAT)
3412 show_stats(&diffstat, options);
3413 if (output_format & DIFF_FORMAT_SHORTSTAT)
3414 show_shortstats(&diffstat, options);
3415 free_diffstat_info(&diffstat);
3416 separator++;
3417 }
3418 if (output_format & DIFF_FORMAT_DIRSTAT)
3419 show_dirstat(options);
3420
3421 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3422 for (i = 0; i < q->nr; i++)
3423 diff_summary(options->file, q->queue[i]);
3424 separator++;
3425 }
3426
3427 if (output_format & DIFF_FORMAT_PATCH) {
3428 if (separator) {
3429 putc(options->line_termination, options->file);
3430 if (options->stat_sep) {
3431 /* attach patch instead of inline */
3432 fputs(options->stat_sep, options->file);
3433 }
3434 }
3435
3436 for (i = 0; i < q->nr; i++) {
3437 struct diff_filepair *p = q->queue[i];
3438 if (check_pair_status(p))
3439 diff_flush_patch(p, options);
3440 }
3441 }
3442
3443 if (output_format & DIFF_FORMAT_CALLBACK)
3444 options->format_callback(q, options, options->format_callback_data);
3445
3446 for (i = 0; i < q->nr; i++)
3447 diff_free_filepair(q->queue[i]);
3448 free_queue:
3449 free(q->queue);
3450 q->queue = NULL;
3451 q->nr = q->alloc = 0;
3452 if (options->close_file)
3453 fclose(options->file);
3454 }
3455
3456 static void diffcore_apply_filter(const char *filter)
3457 {
3458 int i;
3459 struct diff_queue_struct *q = &diff_queued_diff;
3460 struct diff_queue_struct outq;
3461 outq.queue = NULL;
3462 outq.nr = outq.alloc = 0;
3463
3464 if (!filter)
3465 return;
3466
3467 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3468 int found;
3469 for (i = found = 0; !found && i < q->nr; i++) {
3470 struct diff_filepair *p = q->queue[i];
3471 if (((p->status == DIFF_STATUS_MODIFIED) &&
3472 ((p->score &&
3473 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3474 (!p->score &&
3475 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3476 ((p->status != DIFF_STATUS_MODIFIED) &&
3477 strchr(filter, p->status)))
3478 found++;
3479 }
3480 if (found)
3481 return;
3482
3483 /* otherwise we will clear the whole queue
3484 * by copying the empty outq at the end of this
3485 * function, but first clear the current entries
3486 * in the queue.
3487 */
3488 for (i = 0; i < q->nr; i++)
3489 diff_free_filepair(q->queue[i]);
3490 }
3491 else {
3492 /* Only the matching ones */
3493 for (i = 0; i < q->nr; i++) {
3494 struct diff_filepair *p = q->queue[i];
3495
3496 if (((p->status == DIFF_STATUS_MODIFIED) &&
3497 ((p->score &&
3498 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3499 (!p->score &&
3500 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3501 ((p->status != DIFF_STATUS_MODIFIED) &&
3502 strchr(filter, p->status)))
3503 diff_q(&outq, p);
3504 else
3505 diff_free_filepair(p);
3506 }
3507 }
3508 free(q->queue);
3509 *q = outq;
3510 }
3511
3512 /* Check whether two filespecs with the same mode and size are identical */
3513 static int diff_filespec_is_identical(struct diff_filespec *one,
3514 struct diff_filespec *two)
3515 {
3516 if (S_ISGITLINK(one->mode))
3517 return 0;
3518 if (diff_populate_filespec(one, 0))
3519 return 0;
3520 if (diff_populate_filespec(two, 0))
3521 return 0;
3522 return !memcmp(one->data, two->data, one->size);
3523 }
3524
3525 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3526 {
3527 int i;
3528 struct diff_queue_struct *q = &diff_queued_diff;
3529 struct diff_queue_struct outq;
3530 outq.queue = NULL;
3531 outq.nr = outq.alloc = 0;
3532
3533 for (i = 0; i < q->nr; i++) {
3534 struct diff_filepair *p = q->queue[i];
3535
3536 /*
3537 * 1. Entries that come from stat info dirtyness
3538 * always have both sides (iow, not create/delete),
3539 * one side of the object name is unknown, with
3540 * the same mode and size. Keep the ones that
3541 * do not match these criteria. They have real
3542 * differences.
3543 *
3544 * 2. At this point, the file is known to be modified,
3545 * with the same mode and size, and the object
3546 * name of one side is unknown. Need to inspect
3547 * the identical contents.
3548 */
3549 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3550 !DIFF_FILE_VALID(p->two) ||
3551 (p->one->sha1_valid && p->two->sha1_valid) ||
3552 (p->one->mode != p->two->mode) ||
3553 diff_populate_filespec(p->one, 1) ||
3554 diff_populate_filespec(p->two, 1) ||
3555 (p->one->size != p->two->size) ||
3556 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3557 diff_q(&outq, p);
3558 else {
3559 /*
3560 * The caller can subtract 1 from skip_stat_unmatch
3561 * to determine how many paths were dirty only
3562 * due to stat info mismatch.
3563 */
3564 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3565 diffopt->skip_stat_unmatch++;
3566 diff_free_filepair(p);
3567 }
3568 }
3569 free(q->queue);
3570 *q = outq;
3571 }
3572
3573 void diffcore_std(struct diff_options *options)
3574 {
3575 if (options->skip_stat_unmatch)
3576 diffcore_skip_stat_unmatch(options);
3577 if (options->break_opt != -1)
3578 diffcore_break(options->break_opt);
3579 if (options->detect_rename)
3580 diffcore_rename(options);
3581 if (options->break_opt != -1)
3582 diffcore_merge_broken();
3583 if (options->pickaxe)
3584 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3585 if (options->orderfile)
3586 diffcore_order(options->orderfile);
3587 diff_resolve_rename_copy();
3588 diffcore_apply_filter(options->filter);
3589
3590 if (diff_queued_diff.nr)
3591 DIFF_OPT_SET(options, HAS_CHANGES);
3592 else
3593 DIFF_OPT_CLR(options, HAS_CHANGES);
3594 }
3595
3596 int diff_result_code(struct diff_options *opt, int status)
3597 {
3598 int result = 0;
3599 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3600 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3601 return status;
3602 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3603 DIFF_OPT_TST(opt, HAS_CHANGES))
3604 result |= 01;
3605 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3606 DIFF_OPT_TST(opt, CHECK_FAILED))
3607 result |= 02;
3608 return result;
3609 }
3610
3611 void diff_addremove(struct diff_options *options,
3612 int addremove, unsigned mode,
3613 const unsigned char *sha1,
3614 const char *concatpath)
3615 {
3616 struct diff_filespec *one, *two;
3617
3618 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3619 return;
3620
3621 /* This may look odd, but it is a preparation for
3622 * feeding "there are unchanged files which should
3623 * not produce diffs, but when you are doing copy
3624 * detection you would need them, so here they are"
3625 * entries to the diff-core. They will be prefixed
3626 * with something like '=' or '*' (I haven't decided
3627 * which but should not make any difference).
3628 * Feeding the same new and old to diff_change()
3629 * also has the same effect.
3630 * Before the final output happens, they are pruned after
3631 * merged into rename/copy pairs as appropriate.
3632 */
3633 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3634 addremove = (addremove == '+' ? '-' :
3635 addremove == '-' ? '+' : addremove);
3636
3637 if (options->prefix &&
3638 strncmp(concatpath, options->prefix, options->prefix_length))
3639 return;
3640
3641 one = alloc_filespec(concatpath);
3642 two = alloc_filespec(concatpath);
3643
3644 if (addremove != '+')
3645 fill_filespec(one, sha1, mode);
3646 if (addremove != '-')
3647 fill_filespec(two, sha1, mode);
3648
3649 diff_queue(&diff_queued_diff, one, two);
3650 DIFF_OPT_SET(options, HAS_CHANGES);
3651 }
3652
3653 void diff_change(struct diff_options *options,
3654 unsigned old_mode, unsigned new_mode,
3655 const unsigned char *old_sha1,
3656 const unsigned char *new_sha1,
3657 const char *concatpath)
3658 {
3659 struct diff_filespec *one, *two;
3660
3661 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3662 && S_ISGITLINK(new_mode))
3663 return;
3664
3665 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3666 unsigned tmp;
3667 const unsigned char *tmp_c;
3668 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3669 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3670 }
3671
3672 if (options->prefix &&
3673 strncmp(concatpath, options->prefix, options->prefix_length))
3674 return;
3675
3676 one = alloc_filespec(concatpath);
3677 two = alloc_filespec(concatpath);
3678 fill_filespec(one, old_sha1, old_mode);
3679 fill_filespec(two, new_sha1, new_mode);
3680
3681 diff_queue(&diff_queued_diff, one, two);
3682 DIFF_OPT_SET(options, HAS_CHANGES);
3683 }
3684
3685 void diff_unmerge(struct diff_options *options,
3686 const char *path,
3687 unsigned mode, const unsigned char *sha1)
3688 {
3689 struct diff_filespec *one, *two;
3690
3691 if (options->prefix &&
3692 strncmp(path, options->prefix, options->prefix_length))
3693 return;
3694
3695 one = alloc_filespec(path);
3696 two = alloc_filespec(path);
3697 fill_filespec(one, sha1, mode);
3698 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3699 }
3700
3701 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
3702 size_t *outsize)
3703 {
3704 struct diff_tempfile *temp;
3705 const char *argv[3];
3706 const char **arg = argv;
3707 struct child_process child;
3708 struct strbuf buf = STRBUF_INIT;
3709
3710 temp = prepare_temp_file(spec->path, spec);
3711 *arg++ = pgm;
3712 *arg++ = temp->name;
3713 *arg = NULL;
3714
3715 memset(&child, 0, sizeof(child));
3716 child.argv = argv;
3717 child.out = -1;
3718 if (start_command(&child) != 0 ||
3719 strbuf_read(&buf, child.out, 0) < 0 ||
3720 finish_command(&child) != 0) {
3721 strbuf_release(&buf);
3722 remove_tempfile();
3723 error("error running textconv command '%s'", pgm);
3724 return NULL;
3725 }
3726 remove_tempfile();
3727
3728 return strbuf_detach(&buf, outsize);
3729 }
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