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dwim_ref: fix dangling symref warning
[alt-git.git] / diff.c
blob8d8405aba29a4240f6a68c5fb1e3f0ad15050318
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 return -1;
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 (slot < 0)
122 return 0;
123 if (!value)
124 return config_error_nonbool(var);
125 color_parse(value, var, diff_colors[slot]);
126 return 0;
127 }
128
129 /* like GNU diff's --suppress-blank-empty option */
130 if (!strcmp(var, "diff.suppressblankempty") ||
131 /* for backwards compatibility */
132 !strcmp(var, "diff.suppress-blank-empty")) {
133 diff_suppress_blank_empty = git_config_bool(var, value);
134 return 0;
135 }
136
137 return git_color_default_config(var, value, cb);
138 }
139
140 static char *quote_two(const char *one, const char *two)
141 {
142 int need_one = quote_c_style(one, NULL, NULL, 1);
143 int need_two = quote_c_style(two, NULL, NULL, 1);
144 struct strbuf res = STRBUF_INIT;
145
146 if (need_one + need_two) {
147 strbuf_addch(&res, '"');
148 quote_c_style(one, &res, NULL, 1);
149 quote_c_style(two, &res, NULL, 1);
150 strbuf_addch(&res, '"');
151 } else {
152 strbuf_addstr(&res, one);
153 strbuf_addstr(&res, two);
154 }
155 return strbuf_detach(&res, NULL);
156 }
157
158 static const char *external_diff(void)
159 {
160 static const char *external_diff_cmd = NULL;
161 static int done_preparing = 0;
162
163 if (done_preparing)
164 return external_diff_cmd;
165 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
166 if (!external_diff_cmd)
167 external_diff_cmd = external_diff_cmd_cfg;
168 done_preparing = 1;
169 return external_diff_cmd;
170 }
171
172 static struct diff_tempfile {
173 const char *name; /* filename external diff should read from */
174 char hex[41];
175 char mode[10];
176 char tmp_path[PATH_MAX];
177 } diff_temp[2];
178
179 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
180
181 struct emit_callback {
182 int color_diff;
183 unsigned ws_rule;
184 int blank_at_eof_in_preimage;
185 int blank_at_eof_in_postimage;
186 int lno_in_preimage;
187 int lno_in_postimage;
188 sane_truncate_fn truncate;
189 const char **label_path;
190 struct diff_words_data *diff_words;
191 int *found_changesp;
192 FILE *file;
193 };
194
195 static int count_lines(const char *data, int size)
196 {
197 int count, ch, completely_empty = 1, nl_just_seen = 0;
198 count = 0;
199 while (0 < size--) {
200 ch = *data++;
201 if (ch == '\n') {
202 count++;
203 nl_just_seen = 1;
204 completely_empty = 0;
205 }
206 else {
207 nl_just_seen = 0;
208 completely_empty = 0;
209 }
210 }
211 if (completely_empty)
212 return 0;
213 if (!nl_just_seen)
214 count++; /* no trailing newline */
215 return count;
216 }
217
218 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
219 {
220 if (!DIFF_FILE_VALID(one)) {
221 mf->ptr = (char *)""; /* does not matter */
222 mf->size = 0;
223 return 0;
224 }
225 else if (diff_populate_filespec(one, 0))
226 return -1;
227
228 mf->ptr = one->data;
229 mf->size = one->size;
230 return 0;
231 }
232
233 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
234 {
235 char *ptr = mf->ptr;
236 long size = mf->size;
237 int cnt = 0;
238
239 if (!size)
240 return cnt;
241 ptr += size - 1; /* pointing at the very end */
242 if (*ptr != '\n')
243 ; /* incomplete line */
244 else
245 ptr--; /* skip the last LF */
246 while (mf->ptr < ptr) {
247 char *prev_eol;
248 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
249 if (*prev_eol == '\n')
250 break;
251 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
252 break;
253 cnt++;
254 ptr = prev_eol - 1;
255 }
256 return cnt;
257 }
258
259 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
260 struct emit_callback *ecbdata)
261 {
262 int l1, l2, at;
263 unsigned ws_rule = ecbdata->ws_rule;
264 l1 = count_trailing_blank(mf1, ws_rule);
265 l2 = count_trailing_blank(mf2, ws_rule);
266 if (l2 <= l1) {
267 ecbdata->blank_at_eof_in_preimage = 0;
268 ecbdata->blank_at_eof_in_postimage = 0;
269 return;
270 }
271 at = count_lines(mf1->ptr, mf1->size);
272 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
273
274 at = count_lines(mf2->ptr, mf2->size);
275 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
276 }
277
278 static void emit_line_0(FILE *file, const char *set, const char *reset,
279 int first, const char *line, int len)
280 {
281 int has_trailing_newline, has_trailing_carriage_return;
282 int nofirst;
283
284 if (len == 0) {
285 has_trailing_newline = (first == '\n');
286 has_trailing_carriage_return = (!has_trailing_newline &&
287 (first == '\r'));
288 nofirst = has_trailing_newline || has_trailing_carriage_return;
289 } else {
290 has_trailing_newline = (len > 0 && line[len-1] == '\n');
291 if (has_trailing_newline)
292 len--;
293 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
294 if (has_trailing_carriage_return)
295 len--;
296 nofirst = 0;
297 }
298
299 fputs(set, file);
300
301 if (!nofirst)
302 fputc(first, file);
303 fwrite(line, len, 1, file);
304 fputs(reset, file);
305 if (has_trailing_carriage_return)
306 fputc('\r', file);
307 if (has_trailing_newline)
308 fputc('\n', file);
309 }
310
311 static void emit_line(FILE *file, const char *set, const char *reset,
312 const char *line, int len)
313 {
314 emit_line_0(file, set, reset, line[0], line+1, len-1);
315 }
316
317 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
318 {
319 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
320 ecbdata->blank_at_eof_in_preimage &&
321 ecbdata->blank_at_eof_in_postimage &&
322 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
323 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
324 return 0;
325 return ws_blank_line(line, len, ecbdata->ws_rule);
326 }
327
328 static void emit_add_line(const char *reset,
329 struct emit_callback *ecbdata,
330 const char *line, int len)
331 {
332 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
333 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
334
335 if (!*ws)
336 emit_line_0(ecbdata->file, set, reset, '+', line, len);
337 else if (new_blank_line_at_eof(ecbdata, line, len))
338 /* Blank line at EOF - paint '+' as well */
339 emit_line_0(ecbdata->file, ws, reset, '+', line, len);
340 else {
341 /* Emit just the prefix, then the rest. */
342 emit_line_0(ecbdata->file, set, reset, '+', "", 0);
343 ws_check_emit(line, len, ecbdata->ws_rule,
344 ecbdata->file, set, reset, ws);
345 }
346 }
347
348 static struct diff_tempfile *claim_diff_tempfile(void) {
349 int i;
350 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
351 if (!diff_temp[i].name)
352 return diff_temp + i;
353 die("BUG: diff is failing to clean up its tempfiles");
354 }
355
356 static int remove_tempfile_installed;
357
358 static void remove_tempfile(void)
359 {
360 int i;
361 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
362 if (diff_temp[i].name == diff_temp[i].tmp_path)
363 unlink_or_warn(diff_temp[i].name);
364 diff_temp[i].name = NULL;
365 }
366 }
367
368 static void remove_tempfile_on_signal(int signo)
369 {
370 remove_tempfile();
371 sigchain_pop(signo);
372 raise(signo);
373 }
374
375 static void print_line_count(FILE *file, int count)
376 {
377 switch (count) {
378 case 0:
379 fprintf(file, "0,0");
380 break;
381 case 1:
382 fprintf(file, "1");
383 break;
384 default:
385 fprintf(file, "1,%d", count);
386 break;
387 }
388 }
389
390 static void emit_rewrite_lines(struct emit_callback *ecb,
391 int prefix, const char *data, int size)
392 {
393 const char *endp = NULL;
394 static const char *nneof = " No newline at end of file\n";
395 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
396 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
397
398 while (0 < size) {
399 int len;
400
401 endp = memchr(data, '\n', size);
402 len = endp ? (endp - data + 1) : size;
403 if (prefix != '+') {
404 ecb->lno_in_preimage++;
405 emit_line_0(ecb->file, old, reset, '-',
406 data, len);
407 } else {
408 ecb->lno_in_postimage++;
409 emit_add_line(reset, ecb, data, len);
410 }
411 size -= len;
412 data += len;
413 }
414 if (!endp) {
415 const char *plain = diff_get_color(ecb->color_diff,
416 DIFF_PLAIN);
417 emit_line_0(ecb->file, plain, reset, '\\',
418 nneof, strlen(nneof));
419 }
420 }
421
422 static void emit_rewrite_diff(const char *name_a,
423 const char *name_b,
424 struct diff_filespec *one,
425 struct diff_filespec *two,
426 const char *textconv_one,
427 const char *textconv_two,
428 struct diff_options *o)
429 {
430 int lc_a, lc_b;
431 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
432 const char *name_a_tab, *name_b_tab;
433 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
434 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
435 const char *reset = diff_get_color(color_diff, DIFF_RESET);
436 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
437 const char *a_prefix, *b_prefix;
438 const char *data_one, *data_two;
439 size_t size_one, size_two;
440 struct emit_callback ecbdata;
441
442 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
443 a_prefix = o->b_prefix;
444 b_prefix = o->a_prefix;
445 } else {
446 a_prefix = o->a_prefix;
447 b_prefix = o->b_prefix;
448 }
449
450 name_a += (*name_a == '/');
451 name_b += (*name_b == '/');
452 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
453 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
454
455 strbuf_reset(&a_name);
456 strbuf_reset(&b_name);
457 quote_two_c_style(&a_name, a_prefix, name_a, 0);
458 quote_two_c_style(&b_name, b_prefix, name_b, 0);
459
460 diff_populate_filespec(one, 0);
461 diff_populate_filespec(two, 0);
462 if (textconv_one) {
463 data_one = run_textconv(textconv_one, one, &size_one);
464 if (!data_one)
465 die("unable to read files to diff");
466 }
467 else {
468 data_one = one->data;
469 size_one = one->size;
470 }
471 if (textconv_two) {
472 data_two = run_textconv(textconv_two, two, &size_two);
473 if (!data_two)
474 die("unable to read files to diff");
475 }
476 else {
477 data_two = two->data;
478 size_two = two->size;
479 }
480
481 memset(&ecbdata, 0, sizeof(ecbdata));
482 ecbdata.color_diff = color_diff;
483 ecbdata.found_changesp = &o->found_changes;
484 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
485 ecbdata.file = o->file;
486 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
487 mmfile_t mf1, mf2;
488 mf1.ptr = (char *)data_one;
489 mf2.ptr = (char *)data_two;
490 mf1.size = size_one;
491 mf2.size = size_two;
492 check_blank_at_eof(&mf1, &mf2, &ecbdata);
493 }
494 ecbdata.lno_in_preimage = 1;
495 ecbdata.lno_in_postimage = 1;
496
497 lc_a = count_lines(data_one, size_one);
498 lc_b = count_lines(data_two, size_two);
499 fprintf(o->file,
500 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
501 metainfo, a_name.buf, name_a_tab, reset,
502 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
503 print_line_count(o->file, lc_a);
504 fprintf(o->file, " +");
505 print_line_count(o->file, lc_b);
506 fprintf(o->file, " @@%s\n", reset);
507 if (lc_a)
508 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
509 if (lc_b)
510 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
511 }
512
513 struct diff_words_buffer {
514 mmfile_t text;
515 long alloc;
516 struct diff_words_orig {
517 const char *begin, *end;
518 } *orig;
519 int orig_nr, orig_alloc;
520 };
521
522 static void diff_words_append(char *line, unsigned long len,
523 struct diff_words_buffer *buffer)
524 {
525 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
526 line++;
527 len--;
528 memcpy(buffer->text.ptr + buffer->text.size, line, len);
529 buffer->text.size += len;
530 buffer->text.ptr[buffer->text.size] = '\0';
531 }
532
533 struct diff_words_data {
534 struct diff_words_buffer minus, plus;
535 const char *current_plus;
536 FILE *file;
537 regex_t *word_regex;
538 };
539
540 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
541 {
542 struct diff_words_data *diff_words = priv;
543 int minus_first, minus_len, plus_first, plus_len;
544 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
545
546 if (line[0] != '@' || parse_hunk_header(line, len,
547 &minus_first, &minus_len, &plus_first, &plus_len))
548 return;
549
550 /* POSIX requires that first be decremented by one if len == 0... */
551 if (minus_len) {
552 minus_begin = diff_words->minus.orig[minus_first].begin;
553 minus_end =
554 diff_words->minus.orig[minus_first + minus_len - 1].end;
555 } else
556 minus_begin = minus_end =
557 diff_words->minus.orig[minus_first].end;
558
559 if (plus_len) {
560 plus_begin = diff_words->plus.orig[plus_first].begin;
561 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
562 } else
563 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
564
565 if (diff_words->current_plus != plus_begin)
566 fwrite(diff_words->current_plus,
567 plus_begin - diff_words->current_plus, 1,
568 diff_words->file);
569 if (minus_begin != minus_end)
570 color_fwrite_lines(diff_words->file,
571 diff_get_color(1, DIFF_FILE_OLD),
572 minus_end - minus_begin, minus_begin);
573 if (plus_begin != plus_end)
574 color_fwrite_lines(diff_words->file,
575 diff_get_color(1, DIFF_FILE_NEW),
576 plus_end - plus_begin, plus_begin);
577
578 diff_words->current_plus = plus_end;
579 }
580
581 /* This function starts looking at *begin, and returns 0 iff a word was found. */
582 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
583 int *begin, int *end)
584 {
585 if (word_regex && *begin < buffer->size) {
586 regmatch_t match[1];
587 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
588 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
589 '\n', match[0].rm_eo - match[0].rm_so);
590 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
591 *begin += match[0].rm_so;
592 return *begin >= *end;
593 }
594 return -1;
595 }
596
597 /* find the next word */
598 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
599 (*begin)++;
600 if (*begin >= buffer->size)
601 return -1;
602
603 /* find the end of the word */
604 *end = *begin + 1;
605 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
606 (*end)++;
607
608 return 0;
609 }
610
611 /*
612 * This function splits the words in buffer->text, stores the list with
613 * newline separator into out, and saves the offsets of the original words
614 * in buffer->orig.
615 */
616 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
617 regex_t *word_regex)
618 {
619 int i, j;
620 long alloc = 0;
621
622 out->size = 0;
623 out->ptr = NULL;
624
625 /* fake an empty "0th" word */
626 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
627 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
628 buffer->orig_nr = 1;
629
630 for (i = 0; i < buffer->text.size; i++) {
631 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
632 return;
633
634 /* store original boundaries */
635 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
636 buffer->orig_alloc);
637 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
638 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
639 buffer->orig_nr++;
640
641 /* store one word */
642 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
643 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
644 out->ptr[out->size + j - i] = '\n';
645 out->size += j - i + 1;
646
647 i = j - 1;
648 }
649 }
650
651 /* this executes the word diff on the accumulated buffers */
652 static void diff_words_show(struct diff_words_data *diff_words)
653 {
654 xpparam_t xpp;
655 xdemitconf_t xecfg;
656 xdemitcb_t ecb;
657 mmfile_t minus, plus;
658
659 /* special case: only removal */
660 if (!diff_words->plus.text.size) {
661 color_fwrite_lines(diff_words->file,
662 diff_get_color(1, DIFF_FILE_OLD),
663 diff_words->minus.text.size, diff_words->minus.text.ptr);
664 diff_words->minus.text.size = 0;
665 return;
666 }
667
668 diff_words->current_plus = diff_words->plus.text.ptr;
669
670 memset(&xpp, 0, sizeof(xpp));
671 memset(&xecfg, 0, sizeof(xecfg));
672 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
673 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
674 xpp.flags = XDF_NEED_MINIMAL;
675 /* as only the hunk header will be parsed, we need a 0-context */
676 xecfg.ctxlen = 0;
677 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
678 &xpp, &xecfg, &ecb);
679 free(minus.ptr);
680 free(plus.ptr);
681 if (diff_words->current_plus != diff_words->plus.text.ptr +
682 diff_words->plus.text.size)
683 fwrite(diff_words->current_plus,
684 diff_words->plus.text.ptr + diff_words->plus.text.size
685 - diff_words->current_plus, 1,
686 diff_words->file);
687 diff_words->minus.text.size = diff_words->plus.text.size = 0;
688 }
689
690 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
691 static void diff_words_flush(struct emit_callback *ecbdata)
692 {
693 if (ecbdata->diff_words->minus.text.size ||
694 ecbdata->diff_words->plus.text.size)
695 diff_words_show(ecbdata->diff_words);
696 }
697
698 static void free_diff_words_data(struct emit_callback *ecbdata)
699 {
700 if (ecbdata->diff_words) {
701 diff_words_flush(ecbdata);
702 free (ecbdata->diff_words->minus.text.ptr);
703 free (ecbdata->diff_words->minus.orig);
704 free (ecbdata->diff_words->plus.text.ptr);
705 free (ecbdata->diff_words->plus.orig);
706 free(ecbdata->diff_words->word_regex);
707 free(ecbdata->diff_words);
708 ecbdata->diff_words = NULL;
709 }
710 }
711
712 const char *diff_get_color(int diff_use_color, enum color_diff ix)
713 {
714 if (diff_use_color)
715 return diff_colors[ix];
716 return "";
717 }
718
719 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
720 {
721 const char *cp;
722 unsigned long allot;
723 size_t l = len;
724
725 if (ecb->truncate)
726 return ecb->truncate(line, len);
727 cp = line;
728 allot = l;
729 while (0 < l) {
730 (void) utf8_width(&cp, &l);
731 if (!cp)
732 break; /* truncated in the middle? */
733 }
734 return allot - l;
735 }
736
737 static void find_lno(const char *line, struct emit_callback *ecbdata)
738 {
739 const char *p;
740 ecbdata->lno_in_preimage = 0;
741 ecbdata->lno_in_postimage = 0;
742 p = strchr(line, '-');
743 if (!p)
744 return; /* cannot happen */
745 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
746 p = strchr(p, '+');
747 if (!p)
748 return; /* cannot happen */
749 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
750 }
751
752 static void fn_out_consume(void *priv, char *line, unsigned long len)
753 {
754 struct emit_callback *ecbdata = priv;
755 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
756 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
757 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
758
759 *(ecbdata->found_changesp) = 1;
760
761 if (ecbdata->label_path[0]) {
762 const char *name_a_tab, *name_b_tab;
763
764 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
765 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
766
767 fprintf(ecbdata->file, "%s--- %s%s%s\n",
768 meta, ecbdata->label_path[0], reset, name_a_tab);
769 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
770 meta, ecbdata->label_path[1], reset, name_b_tab);
771 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
772 }
773
774 if (diff_suppress_blank_empty
775 && len == 2 && line[0] == ' ' && line[1] == '\n') {
776 line[0] = '\n';
777 len = 1;
778 }
779
780 if (line[0] == '@') {
781 if (ecbdata->diff_words)
782 diff_words_flush(ecbdata);
783 len = sane_truncate_line(ecbdata, line, len);
784 find_lno(line, ecbdata);
785 emit_line(ecbdata->file,
786 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
787 reset, line, len);
788 if (line[len-1] != '\n')
789 putc('\n', ecbdata->file);
790 return;
791 }
792
793 if (len < 1) {
794 emit_line(ecbdata->file, reset, reset, line, len);
795 return;
796 }
797
798 if (ecbdata->diff_words) {
799 if (line[0] == '-') {
800 diff_words_append(line, len,
801 &ecbdata->diff_words->minus);
802 return;
803 } else if (line[0] == '+') {
804 diff_words_append(line, len,
805 &ecbdata->diff_words->plus);
806 return;
807 }
808 diff_words_flush(ecbdata);
809 line++;
810 len--;
811 emit_line(ecbdata->file, plain, reset, line, len);
812 return;
813 }
814
815 if (line[0] != '+') {
816 const char *color =
817 diff_get_color(ecbdata->color_diff,
818 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
819 ecbdata->lno_in_preimage++;
820 if (line[0] == ' ')
821 ecbdata->lno_in_postimage++;
822 emit_line(ecbdata->file, color, reset, line, len);
823 } else {
824 ecbdata->lno_in_postimage++;
825 emit_add_line(reset, ecbdata, line + 1, len - 1);
826 }
827 }
828
829 static char *pprint_rename(const char *a, const char *b)
830 {
831 const char *old = a;
832 const char *new = b;
833 struct strbuf name = STRBUF_INIT;
834 int pfx_length, sfx_length;
835 int len_a = strlen(a);
836 int len_b = strlen(b);
837 int a_midlen, b_midlen;
838 int qlen_a = quote_c_style(a, NULL, NULL, 0);
839 int qlen_b = quote_c_style(b, NULL, NULL, 0);
840
841 if (qlen_a || qlen_b) {
842 quote_c_style(a, &name, NULL, 0);
843 strbuf_addstr(&name, " => ");
844 quote_c_style(b, &name, NULL, 0);
845 return strbuf_detach(&name, NULL);
846 }
847
848 /* Find common prefix */
849 pfx_length = 0;
850 while (*old && *new && *old == *new) {
851 if (*old == '/')
852 pfx_length = old - a + 1;
853 old++;
854 new++;
855 }
856
857 /* Find common suffix */
858 old = a + len_a;
859 new = b + len_b;
860 sfx_length = 0;
861 while (a <= old && b <= new && *old == *new) {
862 if (*old == '/')
863 sfx_length = len_a - (old - a);
864 old--;
865 new--;
866 }
867
868 /*
869 * pfx{mid-a => mid-b}sfx
870 * {pfx-a => pfx-b}sfx
871 * pfx{sfx-a => sfx-b}
872 * name-a => name-b
873 */
874 a_midlen = len_a - pfx_length - sfx_length;
875 b_midlen = len_b - pfx_length - sfx_length;
876 if (a_midlen < 0)
877 a_midlen = 0;
878 if (b_midlen < 0)
879 b_midlen = 0;
880
881 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
882 if (pfx_length + sfx_length) {
883 strbuf_add(&name, a, pfx_length);
884 strbuf_addch(&name, '{');
885 }
886 strbuf_add(&name, a + pfx_length, a_midlen);
887 strbuf_addstr(&name, " => ");
888 strbuf_add(&name, b + pfx_length, b_midlen);
889 if (pfx_length + sfx_length) {
890 strbuf_addch(&name, '}');
891 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
892 }
893 return strbuf_detach(&name, NULL);
894 }
895
896 struct diffstat_t {
897 int nr;
898 int alloc;
899 struct diffstat_file {
900 char *from_name;
901 char *name;
902 char *print_name;
903 unsigned is_unmerged:1;
904 unsigned is_binary:1;
905 unsigned is_renamed:1;
906 unsigned int added, deleted;
907 } **files;
908 };
909
910 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
911 const char *name_a,
912 const char *name_b)
913 {
914 struct diffstat_file *x;
915 x = xcalloc(sizeof (*x), 1);
916 if (diffstat->nr == diffstat->alloc) {
917 diffstat->alloc = alloc_nr(diffstat->alloc);
918 diffstat->files = xrealloc(diffstat->files,
919 diffstat->alloc * sizeof(x));
920 }
921 diffstat->files[diffstat->nr++] = x;
922 if (name_b) {
923 x->from_name = xstrdup(name_a);
924 x->name = xstrdup(name_b);
925 x->is_renamed = 1;
926 }
927 else {
928 x->from_name = NULL;
929 x->name = xstrdup(name_a);
930 }
931 return x;
932 }
933
934 static void diffstat_consume(void *priv, char *line, unsigned long len)
935 {
936 struct diffstat_t *diffstat = priv;
937 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
938
939 if (line[0] == '+')
940 x->added++;
941 else if (line[0] == '-')
942 x->deleted++;
943 }
944
945 const char mime_boundary_leader[] = "------------";
946
947 static int scale_linear(int it, int width, int max_change)
948 {
949 /*
950 * make sure that at least one '-' is printed if there were deletions,
951 * and likewise for '+'.
952 */
953 if (max_change < 2)
954 return it;
955 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
956 }
957
958 static void show_name(FILE *file,
959 const char *prefix, const char *name, int len)
960 {
961 fprintf(file, " %s%-*s |", prefix, len, name);
962 }
963
964 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
965 {
966 if (cnt <= 0)
967 return;
968 fprintf(file, "%s", set);
969 while (cnt--)
970 putc(ch, file);
971 fprintf(file, "%s", reset);
972 }
973
974 static void fill_print_name(struct diffstat_file *file)
975 {
976 char *pname;
977
978 if (file->print_name)
979 return;
980
981 if (!file->is_renamed) {
982 struct strbuf buf = STRBUF_INIT;
983 if (quote_c_style(file->name, &buf, NULL, 0)) {
984 pname = strbuf_detach(&buf, NULL);
985 } else {
986 pname = file->name;
987 strbuf_release(&buf);
988 }
989 } else {
990 pname = pprint_rename(file->from_name, file->name);
991 }
992 file->print_name = pname;
993 }
994
995 static void show_stats(struct diffstat_t *data, struct diff_options *options)
996 {
997 int i, len, add, del, adds = 0, dels = 0;
998 int max_change = 0, max_len = 0;
999 int total_files = data->nr;
1000 int width, name_width;
1001 const char *reset, *set, *add_c, *del_c;
1002
1003 if (data->nr == 0)
1004 return;
1005
1006 width = options->stat_width ? options->stat_width : 80;
1007 name_width = options->stat_name_width ? options->stat_name_width : 50;
1008
1009 /* Sanity: give at least 5 columns to the graph,
1010 * but leave at least 10 columns for the name.
1011 */
1012 if (width < 25)
1013 width = 25;
1014 if (name_width < 10)
1015 name_width = 10;
1016 else if (width < name_width + 15)
1017 name_width = width - 15;
1018
1019 /* Find the longest filename and max number of changes */
1020 reset = diff_get_color_opt(options, DIFF_RESET);
1021 set = diff_get_color_opt(options, DIFF_PLAIN);
1022 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1023 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1024
1025 for (i = 0; i < data->nr; i++) {
1026 struct diffstat_file *file = data->files[i];
1027 int change = file->added + file->deleted;
1028 fill_print_name(file);
1029 len = strlen(file->print_name);
1030 if (max_len < len)
1031 max_len = len;
1032
1033 if (file->is_binary || file->is_unmerged)
1034 continue;
1035 if (max_change < change)
1036 max_change = change;
1037 }
1038
1039 /* Compute the width of the graph part;
1040 * 10 is for one blank at the beginning of the line plus
1041 * " | count " between the name and the graph.
1042 *
1043 * From here on, name_width is the width of the name area,
1044 * and width is the width of the graph area.
1045 */
1046 name_width = (name_width < max_len) ? name_width : max_len;
1047 if (width < (name_width + 10) + max_change)
1048 width = width - (name_width + 10);
1049 else
1050 width = max_change;
1051
1052 for (i = 0; i < data->nr; i++) {
1053 const char *prefix = "";
1054 char *name = data->files[i]->print_name;
1055 int added = data->files[i]->added;
1056 int deleted = data->files[i]->deleted;
1057 int name_len;
1058
1059 /*
1060 * "scale" the filename
1061 */
1062 len = name_width;
1063 name_len = strlen(name);
1064 if (name_width < name_len) {
1065 char *slash;
1066 prefix = "...";
1067 len -= 3;
1068 name += name_len - len;
1069 slash = strchr(name, '/');
1070 if (slash)
1071 name = slash;
1072 }
1073
1074 if (data->files[i]->is_binary) {
1075 show_name(options->file, prefix, name, len);
1076 fprintf(options->file, " Bin ");
1077 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
1078 fprintf(options->file, " -> ");
1079 fprintf(options->file, "%s%d%s", add_c, added, reset);
1080 fprintf(options->file, " bytes");
1081 fprintf(options->file, "\n");
1082 continue;
1083 }
1084 else if (data->files[i]->is_unmerged) {
1085 show_name(options->file, prefix, name, len);
1086 fprintf(options->file, " Unmerged\n");
1087 continue;
1088 }
1089 else if (!data->files[i]->is_renamed &&
1090 (added + deleted == 0)) {
1091 total_files--;
1092 continue;
1093 }
1094
1095 /*
1096 * scale the add/delete
1097 */
1098 add = added;
1099 del = deleted;
1100 adds += add;
1101 dels += del;
1102
1103 if (width <= max_change) {
1104 add = scale_linear(add, width, max_change);
1105 del = scale_linear(del, width, max_change);
1106 }
1107 show_name(options->file, prefix, name, len);
1108 fprintf(options->file, "%5d%s", added + deleted,
1109 added + deleted ? " " : "");
1110 show_graph(options->file, '+', add, add_c, reset);
1111 show_graph(options->file, '-', del, del_c, reset);
1112 fprintf(options->file, "\n");
1113 }
1114 fprintf(options->file,
1115 " %d files changed, %d insertions(+), %d deletions(-)\n",
1116 total_files, adds, dels);
1117 }
1118
1119 static void show_shortstats(struct diffstat_t* data, struct diff_options *options)
1120 {
1121 int i, adds = 0, dels = 0, total_files = data->nr;
1122
1123 if (data->nr == 0)
1124 return;
1125
1126 for (i = 0; i < data->nr; i++) {
1127 if (!data->files[i]->is_binary &&
1128 !data->files[i]->is_unmerged) {
1129 int added = data->files[i]->added;
1130 int deleted= data->files[i]->deleted;
1131 if (!data->files[i]->is_renamed &&
1132 (added + deleted == 0)) {
1133 total_files--;
1134 } else {
1135 adds += added;
1136 dels += deleted;
1137 }
1138 }
1139 }
1140 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1141 total_files, adds, dels);
1142 }
1143
1144 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1145 {
1146 int i;
1147
1148 if (data->nr == 0)
1149 return;
1150
1151 for (i = 0; i < data->nr; i++) {
1152 struct diffstat_file *file = data->files[i];
1153
1154 if (file->is_binary)
1155 fprintf(options->file, "-\t-\t");
1156 else
1157 fprintf(options->file,
1158 "%d\t%d\t", file->added, file->deleted);
1159 if (options->line_termination) {
1160 fill_print_name(file);
1161 if (!file->is_renamed)
1162 write_name_quoted(file->name, options->file,
1163 options->line_termination);
1164 else {
1165 fputs(file->print_name, options->file);
1166 putc(options->line_termination, options->file);
1167 }
1168 } else {
1169 if (file->is_renamed) {
1170 putc('\0', options->file);
1171 write_name_quoted(file->from_name, options->file, '\0');
1172 }
1173 write_name_quoted(file->name, options->file, '\0');
1174 }
1175 }
1176 }
1177
1178 struct dirstat_file {
1179 const char *name;
1180 unsigned long changed;
1181 };
1182
1183 struct dirstat_dir {
1184 struct dirstat_file *files;
1185 int alloc, nr, percent, cumulative;
1186 };
1187
1188 static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
1189 {
1190 unsigned long this_dir = 0;
1191 unsigned int sources = 0;
1192
1193 while (dir->nr) {
1194 struct dirstat_file *f = dir->files;
1195 int namelen = strlen(f->name);
1196 unsigned long this;
1197 char *slash;
1198
1199 if (namelen < baselen)
1200 break;
1201 if (memcmp(f->name, base, baselen))
1202 break;
1203 slash = strchr(f->name + baselen, '/');
1204 if (slash) {
1205 int newbaselen = slash + 1 - f->name;
1206 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
1207 sources++;
1208 } else {
1209 this = f->changed;
1210 dir->files++;
1211 dir->nr--;
1212 sources += 2;
1213 }
1214 this_dir += this;
1215 }
1216
1217 /*
1218 * We don't report dirstat's for
1219 * - the top level
1220 * - or cases where everything came from a single directory
1221 * under this directory (sources == 1).
1222 */
1223 if (baselen && sources != 1) {
1224 int permille = this_dir * 1000 / changed;
1225 if (permille) {
1226 int percent = permille / 10;
1227 if (percent >= dir->percent) {
1228 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1229 if (!dir->cumulative)
1230 return 0;
1231 }
1232 }
1233 }
1234 return this_dir;
1235 }
1236
1237 static int dirstat_compare(const void *_a, const void *_b)
1238 {
1239 const struct dirstat_file *a = _a;
1240 const struct dirstat_file *b = _b;
1241 return strcmp(a->name, b->name);
1242 }
1243
1244 static void show_dirstat(struct diff_options *options)
1245 {
1246 int i;
1247 unsigned long changed;
1248 struct dirstat_dir dir;
1249 struct diff_queue_struct *q = &diff_queued_diff;
1250
1251 dir.files = NULL;
1252 dir.alloc = 0;
1253 dir.nr = 0;
1254 dir.percent = options->dirstat_percent;
1255 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1256
1257 changed = 0;
1258 for (i = 0; i < q->nr; i++) {
1259 struct diff_filepair *p = q->queue[i];
1260 const char *name;
1261 unsigned long copied, added, damage;
1262
1263 name = p->one->path ? p->one->path : p->two->path;
1264
1265 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1266 diff_populate_filespec(p->one, 0);
1267 diff_populate_filespec(p->two, 0);
1268 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1269 &copied, &added);
1270 diff_free_filespec_data(p->one);
1271 diff_free_filespec_data(p->two);
1272 } else if (DIFF_FILE_VALID(p->one)) {
1273 diff_populate_filespec(p->one, 1);
1274 copied = added = 0;
1275 diff_free_filespec_data(p->one);
1276 } else if (DIFF_FILE_VALID(p->two)) {
1277 diff_populate_filespec(p->two, 1);
1278 copied = 0;
1279 added = p->two->size;
1280 diff_free_filespec_data(p->two);
1281 } else
1282 continue;
1283
1284 /*
1285 * Original minus copied is the removed material,
1286 * added is the new material. They are both damages
1287 * made to the preimage. In --dirstat-by-file mode, count
1288 * damaged files, not damaged lines. This is done by
1289 * counting only a single damaged line per file.
1290 */
1291 damage = (p->one->size - copied) + added;
1292 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1293 damage = 1;
1294
1295 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1296 dir.files[dir.nr].name = name;
1297 dir.files[dir.nr].changed = damage;
1298 changed += damage;
1299 dir.nr++;
1300 }
1301
1302 /* This can happen even with many files, if everything was renames */
1303 if (!changed)
1304 return;
1305
1306 /* Show all directories with more than x% of the changes */
1307 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1308 gather_dirstat(options->file, &dir, changed, "", 0);
1309 }
1310
1311 static void free_diffstat_info(struct diffstat_t *diffstat)
1312 {
1313 int i;
1314 for (i = 0; i < diffstat->nr; i++) {
1315 struct diffstat_file *f = diffstat->files[i];
1316 if (f->name != f->print_name)
1317 free(f->print_name);
1318 free(f->name);
1319 free(f->from_name);
1320 free(f);
1321 }
1322 free(diffstat->files);
1323 }
1324
1325 struct checkdiff_t {
1326 const char *filename;
1327 int lineno;
1328 struct diff_options *o;
1329 unsigned ws_rule;
1330 unsigned status;
1331 };
1332
1333 static int is_conflict_marker(const char *line, unsigned long len)
1334 {
1335 char firstchar;
1336 int cnt;
1337
1338 if (len < 8)
1339 return 0;
1340 firstchar = line[0];
1341 switch (firstchar) {
1342 case '=': case '>': case '<':
1343 break;
1344 default:
1345 return 0;
1346 }
1347 for (cnt = 1; cnt < 7; cnt++)
1348 if (line[cnt] != firstchar)
1349 return 0;
1350 /* line[0] thru line[6] are same as firstchar */
1351 if (firstchar == '=') {
1352 /* divider between ours and theirs? */
1353 if (len != 8 || line[7] != '\n')
1354 return 0;
1355 } else if (len < 8 || !isspace(line[7])) {
1356 /* not divider before ours nor after theirs */
1357 return 0;
1358 }
1359 return 1;
1360 }
1361
1362 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1363 {
1364 struct checkdiff_t *data = priv;
1365 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1366 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1367 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1368 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1369 char *err;
1370
1371 if (line[0] == '+') {
1372 unsigned bad;
1373 data->lineno++;
1374 if (is_conflict_marker(line + 1, len - 1)) {
1375 data->status |= 1;
1376 fprintf(data->o->file,
1377 "%s:%d: leftover conflict marker\n",
1378 data->filename, data->lineno);
1379 }
1380 bad = ws_check(line + 1, len - 1, data->ws_rule);
1381 if (!bad)
1382 return;
1383 data->status |= bad;
1384 err = whitespace_error_string(bad);
1385 fprintf(data->o->file, "%s:%d: %s.\n",
1386 data->filename, data->lineno, err);
1387 free(err);
1388 emit_line(data->o->file, set, reset, line, 1);
1389 ws_check_emit(line + 1, len - 1, data->ws_rule,
1390 data->o->file, set, reset, ws);
1391 } else if (line[0] == ' ') {
1392 data->lineno++;
1393 } else if (line[0] == '@') {
1394 char *plus = strchr(line, '+');
1395 if (plus)
1396 data->lineno = strtol(plus, NULL, 10) - 1;
1397 else
1398 die("invalid diff");
1399 }
1400 }
1401
1402 static unsigned char *deflate_it(char *data,
1403 unsigned long size,
1404 unsigned long *result_size)
1405 {
1406 int bound;
1407 unsigned char *deflated;
1408 z_stream stream;
1409
1410 memset(&stream, 0, sizeof(stream));
1411 deflateInit(&stream, zlib_compression_level);
1412 bound = deflateBound(&stream, size);
1413 deflated = xmalloc(bound);
1414 stream.next_out = deflated;
1415 stream.avail_out = bound;
1416
1417 stream.next_in = (unsigned char *)data;
1418 stream.avail_in = size;
1419 while (deflate(&stream, Z_FINISH) == Z_OK)
1420 ; /* nothing */
1421 deflateEnd(&stream);
1422 *result_size = stream.total_out;
1423 return deflated;
1424 }
1425
1426 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
1427 {
1428 void *cp;
1429 void *delta;
1430 void *deflated;
1431 void *data;
1432 unsigned long orig_size;
1433 unsigned long delta_size;
1434 unsigned long deflate_size;
1435 unsigned long data_size;
1436
1437 /* We could do deflated delta, or we could do just deflated two,
1438 * whichever is smaller.
1439 */
1440 delta = NULL;
1441 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1442 if (one->size && two->size) {
1443 delta = diff_delta(one->ptr, one->size,
1444 two->ptr, two->size,
1445 &delta_size, deflate_size);
1446 if (delta) {
1447 void *to_free = delta;
1448 orig_size = delta_size;
1449 delta = deflate_it(delta, delta_size, &delta_size);
1450 free(to_free);
1451 }
1452 }
1453
1454 if (delta && delta_size < deflate_size) {
1455 fprintf(file, "delta %lu\n", orig_size);
1456 free(deflated);
1457 data = delta;
1458 data_size = delta_size;
1459 }
1460 else {
1461 fprintf(file, "literal %lu\n", two->size);
1462 free(delta);
1463 data = deflated;
1464 data_size = deflate_size;
1465 }
1466
1467 /* emit data encoded in base85 */
1468 cp = data;
1469 while (data_size) {
1470 int bytes = (52 < data_size) ? 52 : data_size;
1471 char line[70];
1472 data_size -= bytes;
1473 if (bytes <= 26)
1474 line[0] = bytes + 'A' - 1;
1475 else
1476 line[0] = bytes - 26 + 'a' - 1;
1477 encode_85(line + 1, cp, bytes);
1478 cp = (char *) cp + bytes;
1479 fputs(line, file);
1480 fputc('\n', file);
1481 }
1482 fprintf(file, "\n");
1483 free(data);
1484 }
1485
1486 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
1487 {
1488 fprintf(file, "GIT binary patch\n");
1489 emit_binary_diff_body(file, one, two);
1490 emit_binary_diff_body(file, two, one);
1491 }
1492
1493 static void diff_filespec_load_driver(struct diff_filespec *one)
1494 {
1495 if (!one->driver)
1496 one->driver = userdiff_find_by_path(one->path);
1497 if (!one->driver)
1498 one->driver = userdiff_find_by_name("default");
1499 }
1500
1501 int diff_filespec_is_binary(struct diff_filespec *one)
1502 {
1503 if (one->is_binary == -1) {
1504 diff_filespec_load_driver(one);
1505 if (one->driver->binary != -1)
1506 one->is_binary = one->driver->binary;
1507 else {
1508 if (!one->data && DIFF_FILE_VALID(one))
1509 diff_populate_filespec(one, 0);
1510 if (one->data)
1511 one->is_binary = buffer_is_binary(one->data,
1512 one->size);
1513 if (one->is_binary == -1)
1514 one->is_binary = 0;
1515 }
1516 }
1517 return one->is_binary;
1518 }
1519
1520 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1521 {
1522 diff_filespec_load_driver(one);
1523 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1524 }
1525
1526 static const char *userdiff_word_regex(struct diff_filespec *one)
1527 {
1528 diff_filespec_load_driver(one);
1529 return one->driver->word_regex;
1530 }
1531
1532 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1533 {
1534 if (!options->a_prefix)
1535 options->a_prefix = a;
1536 if (!options->b_prefix)
1537 options->b_prefix = b;
1538 }
1539
1540 static const char *get_textconv(struct diff_filespec *one)
1541 {
1542 if (!DIFF_FILE_VALID(one))
1543 return NULL;
1544 if (!S_ISREG(one->mode))
1545 return NULL;
1546 diff_filespec_load_driver(one);
1547 return one->driver->textconv;
1548 }
1549
1550 static void builtin_diff(const char *name_a,
1551 const char *name_b,
1552 struct diff_filespec *one,
1553 struct diff_filespec *two,
1554 const char *xfrm_msg,
1555 struct diff_options *o,
1556 int complete_rewrite)
1557 {
1558 mmfile_t mf1, mf2;
1559 const char *lbl[2];
1560 char *a_one, *b_two;
1561 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1562 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1563 const char *a_prefix, *b_prefix;
1564 const char *textconv_one = NULL, *textconv_two = NULL;
1565
1566 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1567 textconv_one = get_textconv(one);
1568 textconv_two = get_textconv(two);
1569 }
1570
1571 diff_set_mnemonic_prefix(o, "a/", "b/");
1572 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1573 a_prefix = o->b_prefix;
1574 b_prefix = o->a_prefix;
1575 } else {
1576 a_prefix = o->a_prefix;
1577 b_prefix = o->b_prefix;
1578 }
1579
1580 /* Never use a non-valid filename anywhere if at all possible */
1581 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1582 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1583
1584 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1585 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1586 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1587 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1588 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1589 if (lbl[0][0] == '/') {
1590 /* /dev/null */
1591 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
1592 if (xfrm_msg && xfrm_msg[0])
1593 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1594 }
1595 else if (lbl[1][0] == '/') {
1596 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1597 if (xfrm_msg && xfrm_msg[0])
1598 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1599 }
1600 else {
1601 if (one->mode != two->mode) {
1602 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1603 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
1604 }
1605 if (xfrm_msg && xfrm_msg[0])
1606 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1607 /*
1608 * we do not run diff between different kind
1609 * of objects.
1610 */
1611 if ((one->mode ^ two->mode) & S_IFMT)
1612 goto free_ab_and_return;
1613 if (complete_rewrite &&
1614 (textconv_one || !diff_filespec_is_binary(one)) &&
1615 (textconv_two || !diff_filespec_is_binary(two))) {
1616 emit_rewrite_diff(name_a, name_b, one, two,
1617 textconv_one, textconv_two, o);
1618 o->found_changes = 1;
1619 goto free_ab_and_return;
1620 }
1621 }
1622
1623 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1624 die("unable to read files to diff");
1625
1626 if (!DIFF_OPT_TST(o, TEXT) &&
1627 ( (diff_filespec_is_binary(one) && !textconv_one) ||
1628 (diff_filespec_is_binary(two) && !textconv_two) )) {
1629 /* Quite common confusing case */
1630 if (mf1.size == mf2.size &&
1631 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1632 goto free_ab_and_return;
1633 if (DIFF_OPT_TST(o, BINARY))
1634 emit_binary_diff(o->file, &mf1, &mf2);
1635 else
1636 fprintf(o->file, "Binary files %s and %s differ\n",
1637 lbl[0], lbl[1]);
1638 o->found_changes = 1;
1639 }
1640 else {
1641 /* Crazy xdl interfaces.. */
1642 const char *diffopts = getenv("GIT_DIFF_OPTS");
1643 xpparam_t xpp;
1644 xdemitconf_t xecfg;
1645 xdemitcb_t ecb;
1646 struct emit_callback ecbdata;
1647 const struct userdiff_funcname *pe;
1648
1649 if (textconv_one) {
1650 size_t size;
1651 mf1.ptr = run_textconv(textconv_one, one, &size);
1652 if (!mf1.ptr)
1653 die("unable to read files to diff");
1654 mf1.size = size;
1655 }
1656 if (textconv_two) {
1657 size_t size;
1658 mf2.ptr = run_textconv(textconv_two, two, &size);
1659 if (!mf2.ptr)
1660 die("unable to read files to diff");
1661 mf2.size = size;
1662 }
1663
1664 pe = diff_funcname_pattern(one);
1665 if (!pe)
1666 pe = diff_funcname_pattern(two);
1667
1668 memset(&xpp, 0, sizeof(xpp));
1669 memset(&xecfg, 0, sizeof(xecfg));
1670 memset(&ecbdata, 0, sizeof(ecbdata));
1671 ecbdata.label_path = lbl;
1672 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1673 ecbdata.found_changesp = &o->found_changes;
1674 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1675 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
1676 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1677 ecbdata.file = o->file;
1678 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1679 xecfg.ctxlen = o->context;
1680 xecfg.interhunkctxlen = o->interhunkcontext;
1681 xecfg.flags = XDL_EMIT_FUNCNAMES;
1682 if (pe)
1683 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1684 if (!diffopts)
1685 ;
1686 else if (!prefixcmp(diffopts, "--unified="))
1687 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1688 else if (!prefixcmp(diffopts, "-u"))
1689 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1690 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1691 ecbdata.diff_words =
1692 xcalloc(1, sizeof(struct diff_words_data));
1693 ecbdata.diff_words->file = o->file;
1694 if (!o->word_regex)
1695 o->word_regex = userdiff_word_regex(one);
1696 if (!o->word_regex)
1697 o->word_regex = userdiff_word_regex(two);
1698 if (!o->word_regex)
1699 o->word_regex = diff_word_regex_cfg;
1700 if (o->word_regex) {
1701 ecbdata.diff_words->word_regex = (regex_t *)
1702 xmalloc(sizeof(regex_t));
1703 if (regcomp(ecbdata.diff_words->word_regex,
1704 o->word_regex,
1705 REG_EXTENDED | REG_NEWLINE))
1706 die ("Invalid regular expression: %s",
1707 o->word_regex);
1708 }
1709 }
1710 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
1711 &xpp, &xecfg, &ecb);
1712 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1713 free_diff_words_data(&ecbdata);
1714 if (textconv_one)
1715 free(mf1.ptr);
1716 if (textconv_two)
1717 free(mf2.ptr);
1718 xdiff_clear_find_func(&xecfg);
1719 }
1720
1721 free_ab_and_return:
1722 diff_free_filespec_data(one);
1723 diff_free_filespec_data(two);
1724 free(a_one);
1725 free(b_two);
1726 return;
1727 }
1728
1729 static void builtin_diffstat(const char *name_a, const char *name_b,
1730 struct diff_filespec *one,
1731 struct diff_filespec *two,
1732 struct diffstat_t *diffstat,
1733 struct diff_options *o,
1734 int complete_rewrite)
1735 {
1736 mmfile_t mf1, mf2;
1737 struct diffstat_file *data;
1738
1739 data = diffstat_add(diffstat, name_a, name_b);
1740
1741 if (!one || !two) {
1742 data->is_unmerged = 1;
1743 return;
1744 }
1745 if (complete_rewrite) {
1746 diff_populate_filespec(one, 0);
1747 diff_populate_filespec(two, 0);
1748 data->deleted = count_lines(one->data, one->size);
1749 data->added = count_lines(two->data, two->size);
1750 goto free_and_return;
1751 }
1752 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1753 die("unable to read files to diff");
1754
1755 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1756 data->is_binary = 1;
1757 data->added = mf2.size;
1758 data->deleted = mf1.size;
1759 } else {
1760 /* Crazy xdl interfaces.. */
1761 xpparam_t xpp;
1762 xdemitconf_t xecfg;
1763 xdemitcb_t ecb;
1764
1765 memset(&xpp, 0, sizeof(xpp));
1766 memset(&xecfg, 0, sizeof(xecfg));
1767 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1768 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
1769 &xpp, &xecfg, &ecb);
1770 }
1771
1772 free_and_return:
1773 diff_free_filespec_data(one);
1774 diff_free_filespec_data(two);
1775 }
1776
1777 static void builtin_checkdiff(const char *name_a, const char *name_b,
1778 const char *attr_path,
1779 struct diff_filespec *one,
1780 struct diff_filespec *two,
1781 struct diff_options *o)
1782 {
1783 mmfile_t mf1, mf2;
1784 struct checkdiff_t data;
1785
1786 if (!two)
1787 return;
1788
1789 memset(&data, 0, sizeof(data));
1790 data.filename = name_b ? name_b : name_a;
1791 data.lineno = 0;
1792 data.o = o;
1793 data.ws_rule = whitespace_rule(attr_path);
1794
1795 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1796 die("unable to read files to diff");
1797
1798 /*
1799 * All the other codepaths check both sides, but not checking
1800 * the "old" side here is deliberate. We are checking the newly
1801 * introduced changes, and as long as the "new" side is text, we
1802 * can and should check what it introduces.
1803 */
1804 if (diff_filespec_is_binary(two))
1805 goto free_and_return;
1806 else {
1807 /* Crazy xdl interfaces.. */
1808 xpparam_t xpp;
1809 xdemitconf_t xecfg;
1810 xdemitcb_t ecb;
1811
1812 memset(&xpp, 0, sizeof(xpp));
1813 memset(&xecfg, 0, sizeof(xecfg));
1814 xecfg.ctxlen = 1; /* at least one context line */
1815 xpp.flags = XDF_NEED_MINIMAL;
1816 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
1817 &xpp, &xecfg, &ecb);
1818
1819 if (data.ws_rule & WS_BLANK_AT_EOF) {
1820 struct emit_callback ecbdata;
1821 int blank_at_eof;
1822
1823 ecbdata.ws_rule = data.ws_rule;
1824 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1825 blank_at_eof = ecbdata.blank_at_eof_in_preimage;
1826
1827 if (blank_at_eof) {
1828 static char *err;
1829 if (!err)
1830 err = whitespace_error_string(WS_BLANK_AT_EOF);
1831 fprintf(o->file, "%s:%d: %s.\n",
1832 data.filename, blank_at_eof, err);
1833 data.status = 1; /* report errors */
1834 }
1835 }
1836 }
1837 free_and_return:
1838 diff_free_filespec_data(one);
1839 diff_free_filespec_data(two);
1840 if (data.status)
1841 DIFF_OPT_SET(o, CHECK_FAILED);
1842 }
1843
1844 struct diff_filespec *alloc_filespec(const char *path)
1845 {
1846 int namelen = strlen(path);
1847 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1848
1849 memset(spec, 0, sizeof(*spec));
1850 spec->path = (char *)(spec + 1);
1851 memcpy(spec->path, path, namelen+1);
1852 spec->count = 1;
1853 spec->is_binary = -1;
1854 return spec;
1855 }
1856
1857 void free_filespec(struct diff_filespec *spec)
1858 {
1859 if (!--spec->count) {
1860 diff_free_filespec_data(spec);
1861 free(spec);
1862 }
1863 }
1864
1865 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1866 unsigned short mode)
1867 {
1868 if (mode) {
1869 spec->mode = canon_mode(mode);
1870 hashcpy(spec->sha1, sha1);
1871 spec->sha1_valid = !is_null_sha1(sha1);
1872 }
1873 }
1874
1875 /*
1876 * Given a name and sha1 pair, if the index tells us the file in
1877 * the work tree has that object contents, return true, so that
1878 * prepare_temp_file() does not have to inflate and extract.
1879 */
1880 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1881 {
1882 struct cache_entry *ce;
1883 struct stat st;
1884 int pos, len;
1885
1886 /*
1887 * We do not read the cache ourselves here, because the
1888 * benchmark with my previous version that always reads cache
1889 * shows that it makes things worse for diff-tree comparing
1890 * two linux-2.6 kernel trees in an already checked out work
1891 * tree. This is because most diff-tree comparisons deal with
1892 * only a small number of files, while reading the cache is
1893 * expensive for a large project, and its cost outweighs the
1894 * savings we get by not inflating the object to a temporary
1895 * file. Practically, this code only helps when we are used
1896 * by diff-cache --cached, which does read the cache before
1897 * calling us.
1898 */
1899 if (!active_cache)
1900 return 0;
1901
1902 /* We want to avoid the working directory if our caller
1903 * doesn't need the data in a normal file, this system
1904 * is rather slow with its stat/open/mmap/close syscalls,
1905 * and the object is contained in a pack file. The pack
1906 * is probably already open and will be faster to obtain
1907 * the data through than the working directory. Loose
1908 * objects however would tend to be slower as they need
1909 * to be individually opened and inflated.
1910 */
1911 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
1912 return 0;
1913
1914 len = strlen(name);
1915 pos = cache_name_pos(name, len);
1916 if (pos < 0)
1917 return 0;
1918 ce = active_cache[pos];
1919
1920 /*
1921 * This is not the sha1 we are looking for, or
1922 * unreusable because it is not a regular file.
1923 */
1924 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1925 return 0;
1926
1927 /*
1928 * If ce is marked as "assume unchanged", there is no
1929 * guarantee that work tree matches what we are looking for.
1930 */
1931 if (ce->ce_flags & CE_VALID)
1932 return 0;
1933
1934 /*
1935 * If ce matches the file in the work tree, we can reuse it.
1936 */
1937 if (ce_uptodate(ce) ||
1938 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1939 return 1;
1940
1941 return 0;
1942 }
1943
1944 static int populate_from_stdin(struct diff_filespec *s)
1945 {
1946 struct strbuf buf = STRBUF_INIT;
1947 size_t size = 0;
1948
1949 if (strbuf_read(&buf, 0, 0) < 0)
1950 return error("error while reading from stdin %s",
1951 strerror(errno));
1952
1953 s->should_munmap = 0;
1954 s->data = strbuf_detach(&buf, &size);
1955 s->size = size;
1956 s->should_free = 1;
1957 return 0;
1958 }
1959
1960 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1961 {
1962 int len;
1963 char *data = xmalloc(100);
1964 len = snprintf(data, 100,
1965 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1966 s->data = data;
1967 s->size = len;
1968 s->should_free = 1;
1969 if (size_only) {
1970 s->data = NULL;
1971 free(data);
1972 }
1973 return 0;
1974 }
1975
1976 /*
1977 * While doing rename detection and pickaxe operation, we may need to
1978 * grab the data for the blob (or file) for our own in-core comparison.
1979 * diff_filespec has data and size fields for this purpose.
1980 */
1981 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1982 {
1983 int err = 0;
1984 if (!DIFF_FILE_VALID(s))
1985 die("internal error: asking to populate invalid file.");
1986 if (S_ISDIR(s->mode))
1987 return -1;
1988
1989 if (s->data)
1990 return 0;
1991
1992 if (size_only && 0 < s->size)
1993 return 0;
1994
1995 if (S_ISGITLINK(s->mode))
1996 return diff_populate_gitlink(s, size_only);
1997
1998 if (!s->sha1_valid ||
1999 reuse_worktree_file(s->path, s->sha1, 0)) {
2000 struct strbuf buf = STRBUF_INIT;
2001 struct stat st;
2002 int fd;
2003
2004 if (!strcmp(s->path, "-"))
2005 return populate_from_stdin(s);
2006
2007 if (lstat(s->path, &st) < 0) {
2008 if (errno == ENOENT) {
2009 err_empty:
2010 err = -1;
2011 empty:
2012 s->data = (char *)"";
2013 s->size = 0;
2014 return err;
2015 }
2016 }
2017 s->size = xsize_t(st.st_size);
2018 if (!s->size)
2019 goto empty;
2020 if (S_ISLNK(st.st_mode)) {
2021 struct strbuf sb = STRBUF_INIT;
2022
2023 if (strbuf_readlink(&sb, s->path, s->size))
2024 goto err_empty;
2025 s->size = sb.len;
2026 s->data = strbuf_detach(&sb, NULL);
2027 s->should_free = 1;
2028 return 0;
2029 }
2030 if (size_only)
2031 return 0;
2032 fd = open(s->path, O_RDONLY);
2033 if (fd < 0)
2034 goto err_empty;
2035 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2036 close(fd);
2037 s->should_munmap = 1;
2038
2039 /*
2040 * Convert from working tree format to canonical git format
2041 */
2042 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2043 size_t size = 0;
2044 munmap(s->data, s->size);
2045 s->should_munmap = 0;
2046 s->data = strbuf_detach(&buf, &size);
2047 s->size = size;
2048 s->should_free = 1;
2049 }
2050 }
2051 else {
2052 enum object_type type;
2053 if (size_only)
2054 type = sha1_object_info(s->sha1, &s->size);
2055 else {
2056 s->data = read_sha1_file(s->sha1, &type, &s->size);
2057 s->should_free = 1;
2058 }
2059 }
2060 return 0;
2061 }
2062
2063 void diff_free_filespec_blob(struct diff_filespec *s)
2064 {
2065 if (s->should_free)
2066 free(s->data);
2067 else if (s->should_munmap)
2068 munmap(s->data, s->size);
2069
2070 if (s->should_free || s->should_munmap) {
2071 s->should_free = s->should_munmap = 0;
2072 s->data = NULL;
2073 }
2074 }
2075
2076 void diff_free_filespec_data(struct diff_filespec *s)
2077 {
2078 diff_free_filespec_blob(s);
2079 free(s->cnt_data);
2080 s->cnt_data = NULL;
2081 }
2082
2083 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2084 void *blob,
2085 unsigned long size,
2086 const unsigned char *sha1,
2087 int mode)
2088 {
2089 int fd;
2090 struct strbuf buf = STRBUF_INIT;
2091 struct strbuf template = STRBUF_INIT;
2092 char *path_dup = xstrdup(path);
2093 const char *base = basename(path_dup);
2094
2095 /* Generate "XXXXXX_basename.ext" */
2096 strbuf_addstr(&template, "XXXXXX_");
2097 strbuf_addstr(&template, base);
2098
2099 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2100 strlen(base) + 1);
2101 if (fd < 0)
2102 die_errno("unable to create temp-file");
2103 if (convert_to_working_tree(path,
2104 (const char *)blob, (size_t)size, &buf)) {
2105 blob = buf.buf;
2106 size = buf.len;
2107 }
2108 if (write_in_full(fd, blob, size) != size)
2109 die_errno("unable to write temp-file");
2110 close(fd);
2111 temp->name = temp->tmp_path;
2112 strcpy(temp->hex, sha1_to_hex(sha1));
2113 temp->hex[40] = 0;
2114 sprintf(temp->mode, "%06o", mode);
2115 strbuf_release(&buf);
2116 strbuf_release(&template);
2117 free(path_dup);
2118 }
2119
2120 static struct diff_tempfile *prepare_temp_file(const char *name,
2121 struct diff_filespec *one)
2122 {
2123 struct diff_tempfile *temp = claim_diff_tempfile();
2124
2125 if (!DIFF_FILE_VALID(one)) {
2126 not_a_valid_file:
2127 /* A '-' entry produces this for file-2, and
2128 * a '+' entry produces this for file-1.
2129 */
2130 temp->name = "/dev/null";
2131 strcpy(temp->hex, ".");
2132 strcpy(temp->mode, ".");
2133 return temp;
2134 }
2135
2136 if (!remove_tempfile_installed) {
2137 atexit(remove_tempfile);
2138 sigchain_push_common(remove_tempfile_on_signal);
2139 remove_tempfile_installed = 1;
2140 }
2141
2142 if (!one->sha1_valid ||
2143 reuse_worktree_file(name, one->sha1, 1)) {
2144 struct stat st;
2145 if (lstat(name, &st) < 0) {
2146 if (errno == ENOENT)
2147 goto not_a_valid_file;
2148 die_errno("stat(%s)", name);
2149 }
2150 if (S_ISLNK(st.st_mode)) {
2151 struct strbuf sb = STRBUF_INIT;
2152 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2153 die_errno("readlink(%s)", name);
2154 prep_temp_blob(name, temp, sb.buf, sb.len,
2155 (one->sha1_valid ?
2156 one->sha1 : null_sha1),
2157 (one->sha1_valid ?
2158 one->mode : S_IFLNK));
2159 strbuf_release(&sb);
2160 }
2161 else {
2162 /* we can borrow from the file in the work tree */
2163 temp->name = name;
2164 if (!one->sha1_valid)
2165 strcpy(temp->hex, sha1_to_hex(null_sha1));
2166 else
2167 strcpy(temp->hex, sha1_to_hex(one->sha1));
2168 /* Even though we may sometimes borrow the
2169 * contents from the work tree, we always want
2170 * one->mode. mode is trustworthy even when
2171 * !(one->sha1_valid), as long as
2172 * DIFF_FILE_VALID(one).
2173 */
2174 sprintf(temp->mode, "%06o", one->mode);
2175 }
2176 return temp;
2177 }
2178 else {
2179 if (diff_populate_filespec(one, 0))
2180 die("cannot read data blob for %s", one->path);
2181 prep_temp_blob(name, temp, one->data, one->size,
2182 one->sha1, one->mode);
2183 }
2184 return temp;
2185 }
2186
2187 /* An external diff command takes:
2188 *
2189 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2190 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2191 *
2192 */
2193 static void run_external_diff(const char *pgm,
2194 const char *name,
2195 const char *other,
2196 struct diff_filespec *one,
2197 struct diff_filespec *two,
2198 const char *xfrm_msg,
2199 int complete_rewrite)
2200 {
2201 const char *spawn_arg[10];
2202 int retval;
2203 const char **arg = &spawn_arg[0];
2204
2205 if (one && two) {
2206 struct diff_tempfile *temp_one, *temp_two;
2207 const char *othername = (other ? other : name);
2208 temp_one = prepare_temp_file(name, one);
2209 temp_two = prepare_temp_file(othername, two);
2210 *arg++ = pgm;
2211 *arg++ = name;
2212 *arg++ = temp_one->name;
2213 *arg++ = temp_one->hex;
2214 *arg++ = temp_one->mode;
2215 *arg++ = temp_two->name;
2216 *arg++ = temp_two->hex;
2217 *arg++ = temp_two->mode;
2218 if (other) {
2219 *arg++ = other;
2220 *arg++ = xfrm_msg;
2221 }
2222 } else {
2223 *arg++ = pgm;
2224 *arg++ = name;
2225 }
2226 *arg = NULL;
2227 fflush(NULL);
2228 retval = run_command_v_opt(spawn_arg, 0);
2229 remove_tempfile();
2230 if (retval) {
2231 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2232 exit(1);
2233 }
2234 }
2235
2236 static int similarity_index(struct diff_filepair *p)
2237 {
2238 return p->score * 100 / MAX_SCORE;
2239 }
2240
2241 static void fill_metainfo(struct strbuf *msg,
2242 const char *name,
2243 const char *other,
2244 struct diff_filespec *one,
2245 struct diff_filespec *two,
2246 struct diff_options *o,
2247 struct diff_filepair *p)
2248 {
2249 strbuf_init(msg, PATH_MAX * 2 + 300);
2250 switch (p->status) {
2251 case DIFF_STATUS_COPIED:
2252 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2253 strbuf_addstr(msg, "\ncopy from ");
2254 quote_c_style(name, msg, NULL, 0);
2255 strbuf_addstr(msg, "\ncopy to ");
2256 quote_c_style(other, msg, NULL, 0);
2257 strbuf_addch(msg, '\n');
2258 break;
2259 case DIFF_STATUS_RENAMED:
2260 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2261 strbuf_addstr(msg, "\nrename from ");
2262 quote_c_style(name, msg, NULL, 0);
2263 strbuf_addstr(msg, "\nrename to ");
2264 quote_c_style(other, msg, NULL, 0);
2265 strbuf_addch(msg, '\n');
2266 break;
2267 case DIFF_STATUS_MODIFIED:
2268 if (p->score) {
2269 strbuf_addf(msg, "dissimilarity index %d%%\n",
2270 similarity_index(p));
2271 break;
2272 }
2273 /* fallthru */
2274 default:
2275 /* nothing */
2276 ;
2277 }
2278 if (one && two && hashcmp(one->sha1, two->sha1)) {
2279 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2280
2281 if (DIFF_OPT_TST(o, BINARY)) {
2282 mmfile_t mf;
2283 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2284 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2285 abbrev = 40;
2286 }
2287 strbuf_addf(msg, "index %.*s..%.*s",
2288 abbrev, sha1_to_hex(one->sha1),
2289 abbrev, sha1_to_hex(two->sha1));
2290 if (one->mode == two->mode)
2291 strbuf_addf(msg, " %06o", one->mode);
2292 strbuf_addch(msg, '\n');
2293 }
2294 if (msg->len)
2295 strbuf_setlen(msg, msg->len - 1);
2296 }
2297
2298 static void run_diff_cmd(const char *pgm,
2299 const char *name,
2300 const char *other,
2301 const char *attr_path,
2302 struct diff_filespec *one,
2303 struct diff_filespec *two,
2304 struct strbuf *msg,
2305 struct diff_options *o,
2306 struct diff_filepair *p)
2307 {
2308 const char *xfrm_msg = NULL;
2309 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2310
2311 if (msg) {
2312 fill_metainfo(msg, name, other, one, two, o, p);
2313 xfrm_msg = msg->len ? msg->buf : NULL;
2314 }
2315
2316 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2317 pgm = NULL;
2318 else {
2319 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2320 if (drv && drv->external)
2321 pgm = drv->external;
2322 }
2323
2324 if (pgm) {
2325 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2326 complete_rewrite);
2327 return;
2328 }
2329 if (one && two)
2330 builtin_diff(name, other ? other : name,
2331 one, two, xfrm_msg, o, complete_rewrite);
2332 else
2333 fprintf(o->file, "* Unmerged path %s\n", name);
2334 }
2335
2336 static void diff_fill_sha1_info(struct diff_filespec *one)
2337 {
2338 if (DIFF_FILE_VALID(one)) {
2339 if (!one->sha1_valid) {
2340 struct stat st;
2341 if (!strcmp(one->path, "-")) {
2342 hashcpy(one->sha1, null_sha1);
2343 return;
2344 }
2345 if (lstat(one->path, &st) < 0)
2346 die_errno("stat '%s'", one->path);
2347 if (index_path(one->sha1, one->path, &st, 0))
2348 die("cannot hash %s", one->path);
2349 }
2350 }
2351 else
2352 hashclr(one->sha1);
2353 }
2354
2355 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2356 {
2357 /* Strip the prefix but do not molest /dev/null and absolute paths */
2358 if (*namep && **namep != '/')
2359 *namep += prefix_length;
2360 if (*otherp && **otherp != '/')
2361 *otherp += prefix_length;
2362 }
2363
2364 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2365 {
2366 const char *pgm = external_diff();
2367 struct strbuf msg;
2368 struct diff_filespec *one = p->one;
2369 struct diff_filespec *two = p->two;
2370 const char *name;
2371 const char *other;
2372 const char *attr_path;
2373
2374 name = p->one->path;
2375 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2376 attr_path = name;
2377 if (o->prefix_length)
2378 strip_prefix(o->prefix_length, &name, &other);
2379
2380 if (DIFF_PAIR_UNMERGED(p)) {
2381 run_diff_cmd(pgm, name, NULL, attr_path,
2382 NULL, NULL, NULL, o, p);
2383 return;
2384 }
2385
2386 diff_fill_sha1_info(one);
2387 diff_fill_sha1_info(two);
2388
2389 if (!pgm &&
2390 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2391 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2392 /*
2393 * a filepair that changes between file and symlink
2394 * needs to be split into deletion and creation.
2395 */
2396 struct diff_filespec *null = alloc_filespec(two->path);
2397 run_diff_cmd(NULL, name, other, attr_path,
2398 one, null, &msg, o, p);
2399 free(null);
2400 strbuf_release(&msg);
2401
2402 null = alloc_filespec(one->path);
2403 run_diff_cmd(NULL, name, other, attr_path,
2404 null, two, &msg, o, p);
2405 free(null);
2406 }
2407 else
2408 run_diff_cmd(pgm, name, other, attr_path,
2409 one, two, &msg, o, p);
2410
2411 strbuf_release(&msg);
2412 }
2413
2414 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2415 struct diffstat_t *diffstat)
2416 {
2417 const char *name;
2418 const char *other;
2419 int complete_rewrite = 0;
2420
2421 if (DIFF_PAIR_UNMERGED(p)) {
2422 /* unmerged */
2423 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2424 return;
2425 }
2426
2427 name = p->one->path;
2428 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2429
2430 if (o->prefix_length)
2431 strip_prefix(o->prefix_length, &name, &other);
2432
2433 diff_fill_sha1_info(p->one);
2434 diff_fill_sha1_info(p->two);
2435
2436 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2437 complete_rewrite = 1;
2438 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2439 }
2440
2441 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2442 {
2443 const char *name;
2444 const char *other;
2445 const char *attr_path;
2446
2447 if (DIFF_PAIR_UNMERGED(p)) {
2448 /* unmerged */
2449 return;
2450 }
2451
2452 name = p->one->path;
2453 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2454 attr_path = other ? other : name;
2455
2456 if (o->prefix_length)
2457 strip_prefix(o->prefix_length, &name, &other);
2458
2459 diff_fill_sha1_info(p->one);
2460 diff_fill_sha1_info(p->two);
2461
2462 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2463 }
2464
2465 void diff_setup(struct diff_options *options)
2466 {
2467 memset(options, 0, sizeof(*options));
2468
2469 options->file = stdout;
2470
2471 options->line_termination = '\n';
2472 options->break_opt = -1;
2473 options->rename_limit = -1;
2474 options->dirstat_percent = 3;
2475 options->context = 3;
2476
2477 options->change = diff_change;
2478 options->add_remove = diff_addremove;
2479 if (diff_use_color_default > 0)
2480 DIFF_OPT_SET(options, COLOR_DIFF);
2481 options->detect_rename = diff_detect_rename_default;
2482
2483 if (!diff_mnemonic_prefix) {
2484 options->a_prefix = "a/";
2485 options->b_prefix = "b/";
2486 }
2487 }
2488
2489 int diff_setup_done(struct diff_options *options)
2490 {
2491 int count = 0;
2492
2493 if (options->output_format & DIFF_FORMAT_NAME)
2494 count++;
2495 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2496 count++;
2497 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2498 count++;
2499 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2500 count++;
2501 if (count > 1)
2502 die("--name-only, --name-status, --check and -s are mutually exclusive");
2503
2504 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2505 options->detect_rename = DIFF_DETECT_COPY;
2506
2507 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2508 options->prefix = NULL;
2509 if (options->prefix)
2510 options->prefix_length = strlen(options->prefix);
2511 else
2512 options->prefix_length = 0;
2513
2514 if (options->output_format & (DIFF_FORMAT_NAME |
2515 DIFF_FORMAT_NAME_STATUS |
2516 DIFF_FORMAT_CHECKDIFF |
2517 DIFF_FORMAT_NO_OUTPUT))
2518 options->output_format &= ~(DIFF_FORMAT_RAW |
2519 DIFF_FORMAT_NUMSTAT |
2520 DIFF_FORMAT_DIFFSTAT |
2521 DIFF_FORMAT_SHORTSTAT |
2522 DIFF_FORMAT_DIRSTAT |
2523 DIFF_FORMAT_SUMMARY |
2524 DIFF_FORMAT_PATCH);
2525
2526 /*
2527 * These cases always need recursive; we do not drop caller-supplied
2528 * recursive bits for other formats here.
2529 */
2530 if (options->output_format & (DIFF_FORMAT_PATCH |
2531 DIFF_FORMAT_NUMSTAT |
2532 DIFF_FORMAT_DIFFSTAT |
2533 DIFF_FORMAT_SHORTSTAT |
2534 DIFF_FORMAT_DIRSTAT |
2535 DIFF_FORMAT_SUMMARY |
2536 DIFF_FORMAT_CHECKDIFF))
2537 DIFF_OPT_SET(options, RECURSIVE);
2538 /*
2539 * Also pickaxe would not work very well if you do not say recursive
2540 */
2541 if (options->pickaxe)
2542 DIFF_OPT_SET(options, RECURSIVE);
2543
2544 if (options->detect_rename && options->rename_limit < 0)
2545 options->rename_limit = diff_rename_limit_default;
2546 if (options->setup & DIFF_SETUP_USE_CACHE) {
2547 if (!active_cache)
2548 /* read-cache does not die even when it fails
2549 * so it is safe for us to do this here. Also
2550 * it does not smudge active_cache or active_nr
2551 * when it fails, so we do not have to worry about
2552 * cleaning it up ourselves either.
2553 */
2554 read_cache();
2555 }
2556 if (options->abbrev <= 0 || 40 < options->abbrev)
2557 options->abbrev = 40; /* full */
2558
2559 /*
2560 * It does not make sense to show the first hit we happened
2561 * to have found. It does not make sense not to return with
2562 * exit code in such a case either.
2563 */
2564 if (DIFF_OPT_TST(options, QUIET)) {
2565 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2566 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2567 }
2568
2569 return 0;
2570 }
2571
2572 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2573 {
2574 char c, *eq;
2575 int len;
2576
2577 if (*arg != '-')
2578 return 0;
2579 c = *++arg;
2580 if (!c)
2581 return 0;
2582 if (c == arg_short) {
2583 c = *++arg;
2584 if (!c)
2585 return 1;
2586 if (val && isdigit(c)) {
2587 char *end;
2588 int n = strtoul(arg, &end, 10);
2589 if (*end)
2590 return 0;
2591 *val = n;
2592 return 1;
2593 }
2594 return 0;
2595 }
2596 if (c != '-')
2597 return 0;
2598 arg++;
2599 eq = strchr(arg, '=');
2600 if (eq)
2601 len = eq - arg;
2602 else
2603 len = strlen(arg);
2604 if (!len || strncmp(arg, arg_long, len))
2605 return 0;
2606 if (eq) {
2607 int n;
2608 char *end;
2609 if (!isdigit(*++eq))
2610 return 0;
2611 n = strtoul(eq, &end, 10);
2612 if (*end)
2613 return 0;
2614 *val = n;
2615 }
2616 return 1;
2617 }
2618
2619 static int diff_scoreopt_parse(const char *opt);
2620
2621 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2622 {
2623 const char *arg = av[0];
2624
2625 /* Output format options */
2626 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2627 options->output_format |= DIFF_FORMAT_PATCH;
2628 else if (opt_arg(arg, 'U', "unified", &options->context))
2629 options->output_format |= DIFF_FORMAT_PATCH;
2630 else if (!strcmp(arg, "--raw"))
2631 options->output_format |= DIFF_FORMAT_RAW;
2632 else if (!strcmp(arg, "--patch-with-raw"))
2633 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2634 else if (!strcmp(arg, "--numstat"))
2635 options->output_format |= DIFF_FORMAT_NUMSTAT;
2636 else if (!strcmp(arg, "--shortstat"))
2637 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2638 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2639 options->output_format |= DIFF_FORMAT_DIRSTAT;
2640 else if (!strcmp(arg, "--cumulative")) {
2641 options->output_format |= DIFF_FORMAT_DIRSTAT;
2642 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
2643 } else if (opt_arg(arg, 0, "dirstat-by-file",
2644 &options->dirstat_percent)) {
2645 options->output_format |= DIFF_FORMAT_DIRSTAT;
2646 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
2647 }
2648 else if (!strcmp(arg, "--check"))
2649 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2650 else if (!strcmp(arg, "--summary"))
2651 options->output_format |= DIFF_FORMAT_SUMMARY;
2652 else if (!strcmp(arg, "--patch-with-stat"))
2653 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2654 else if (!strcmp(arg, "--name-only"))
2655 options->output_format |= DIFF_FORMAT_NAME;
2656 else if (!strcmp(arg, "--name-status"))
2657 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2658 else if (!strcmp(arg, "-s"))
2659 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2660 else if (!prefixcmp(arg, "--stat")) {
2661 char *end;
2662 int width = options->stat_width;
2663 int name_width = options->stat_name_width;
2664 arg += 6;
2665 end = (char *)arg;
2666
2667 switch (*arg) {
2668 case '-':
2669 if (!prefixcmp(arg, "-width="))
2670 width = strtoul(arg + 7, &end, 10);
2671 else if (!prefixcmp(arg, "-name-width="))
2672 name_width = strtoul(arg + 12, &end, 10);
2673 break;
2674 case '=':
2675 width = strtoul(arg+1, &end, 10);
2676 if (*end == ',')
2677 name_width = strtoul(end+1, &end, 10);
2678 }
2679
2680 /* Important! This checks all the error cases! */
2681 if (*end)
2682 return 0;
2683 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2684 options->stat_name_width = name_width;
2685 options->stat_width = width;
2686 }
2687
2688 /* renames options */
2689 else if (!prefixcmp(arg, "-B")) {
2690 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2691 return -1;
2692 }
2693 else if (!prefixcmp(arg, "-M")) {
2694 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2695 return -1;
2696 options->detect_rename = DIFF_DETECT_RENAME;
2697 }
2698 else if (!prefixcmp(arg, "-C")) {
2699 if (options->detect_rename == DIFF_DETECT_COPY)
2700 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2701 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2702 return -1;
2703 options->detect_rename = DIFF_DETECT_COPY;
2704 }
2705 else if (!strcmp(arg, "--no-renames"))
2706 options->detect_rename = 0;
2707 else if (!strcmp(arg, "--relative"))
2708 DIFF_OPT_SET(options, RELATIVE_NAME);
2709 else if (!prefixcmp(arg, "--relative=")) {
2710 DIFF_OPT_SET(options, RELATIVE_NAME);
2711 options->prefix = arg + 11;
2712 }
2713
2714 /* xdiff options */
2715 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2716 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
2717 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2718 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
2719 else if (!strcmp(arg, "--ignore-space-at-eol"))
2720 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
2721 else if (!strcmp(arg, "--patience"))
2722 DIFF_XDL_SET(options, PATIENCE_DIFF);
2723
2724 /* flags options */
2725 else if (!strcmp(arg, "--binary")) {
2726 options->output_format |= DIFF_FORMAT_PATCH;
2727 DIFF_OPT_SET(options, BINARY);
2728 }
2729 else if (!strcmp(arg, "--full-index"))
2730 DIFF_OPT_SET(options, FULL_INDEX);
2731 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2732 DIFF_OPT_SET(options, TEXT);
2733 else if (!strcmp(arg, "-R"))
2734 DIFF_OPT_SET(options, REVERSE_DIFF);
2735 else if (!strcmp(arg, "--find-copies-harder"))
2736 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2737 else if (!strcmp(arg, "--follow"))
2738 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2739 else if (!strcmp(arg, "--color"))
2740 DIFF_OPT_SET(options, COLOR_DIFF);
2741 else if (!strcmp(arg, "--no-color"))
2742 DIFF_OPT_CLR(options, COLOR_DIFF);
2743 else if (!strcmp(arg, "--color-words")) {
2744 DIFF_OPT_SET(options, COLOR_DIFF);
2745 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2746 }
2747 else if (!prefixcmp(arg, "--color-words=")) {
2748 DIFF_OPT_SET(options, COLOR_DIFF);
2749 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2750 options->word_regex = arg + 14;
2751 }
2752 else if (!strcmp(arg, "--exit-code"))
2753 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2754 else if (!strcmp(arg, "--quiet"))
2755 DIFF_OPT_SET(options, QUIET);
2756 else if (!strcmp(arg, "--ext-diff"))
2757 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2758 else if (!strcmp(arg, "--no-ext-diff"))
2759 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2760 else if (!strcmp(arg, "--textconv"))
2761 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
2762 else if (!strcmp(arg, "--no-textconv"))
2763 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
2764 else if (!strcmp(arg, "--ignore-submodules"))
2765 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2766
2767 /* misc options */
2768 else if (!strcmp(arg, "-z"))
2769 options->line_termination = 0;
2770 else if (!prefixcmp(arg, "-l"))
2771 options->rename_limit = strtoul(arg+2, NULL, 10);
2772 else if (!prefixcmp(arg, "-S"))
2773 options->pickaxe = arg + 2;
2774 else if (!strcmp(arg, "--pickaxe-all"))
2775 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2776 else if (!strcmp(arg, "--pickaxe-regex"))
2777 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2778 else if (!prefixcmp(arg, "-O"))
2779 options->orderfile = arg + 2;
2780 else if (!prefixcmp(arg, "--diff-filter="))
2781 options->filter = arg + 14;
2782 else if (!strcmp(arg, "--abbrev"))
2783 options->abbrev = DEFAULT_ABBREV;
2784 else if (!prefixcmp(arg, "--abbrev=")) {
2785 options->abbrev = strtoul(arg + 9, NULL, 10);
2786 if (options->abbrev < MINIMUM_ABBREV)
2787 options->abbrev = MINIMUM_ABBREV;
2788 else if (40 < options->abbrev)
2789 options->abbrev = 40;
2790 }
2791 else if (!prefixcmp(arg, "--src-prefix="))
2792 options->a_prefix = arg + 13;
2793 else if (!prefixcmp(arg, "--dst-prefix="))
2794 options->b_prefix = arg + 13;
2795 else if (!strcmp(arg, "--no-prefix"))
2796 options->a_prefix = options->b_prefix = "";
2797 else if (opt_arg(arg, '\0', "inter-hunk-context",
2798 &options->interhunkcontext))
2799 ;
2800 else if (!prefixcmp(arg, "--output=")) {
2801 options->file = fopen(arg + strlen("--output="), "w");
2802 if (!options->file)
2803 die_errno("Could not open '%s'", arg + strlen("--output="));
2804 options->close_file = 1;
2805 } else
2806 return 0;
2807 return 1;
2808 }
2809
2810 static int parse_num(const char **cp_p)
2811 {
2812 unsigned long num, scale;
2813 int ch, dot;
2814 const char *cp = *cp_p;
2815
2816 num = 0;
2817 scale = 1;
2818 dot = 0;
2819 for (;;) {
2820 ch = *cp;
2821 if ( !dot && ch == '.' ) {
2822 scale = 1;
2823 dot = 1;
2824 } else if ( ch == '%' ) {
2825 scale = dot ? scale*100 : 100;
2826 cp++; /* % is always at the end */
2827 break;
2828 } else if ( ch >= '0' && ch <= '9' ) {
2829 if ( scale < 100000 ) {
2830 scale *= 10;
2831 num = (num*10) + (ch-'0');
2832 }
2833 } else {
2834 break;
2835 }
2836 cp++;
2837 }
2838 *cp_p = cp;
2839
2840 /* user says num divided by scale and we say internally that
2841 * is MAX_SCORE * num / scale.
2842 */
2843 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2844 }
2845
2846 static int diff_scoreopt_parse(const char *opt)
2847 {
2848 int opt1, opt2, cmd;
2849
2850 if (*opt++ != '-')
2851 return -1;
2852 cmd = *opt++;
2853 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2854 return -1; /* that is not a -M, -C nor -B option */
2855
2856 opt1 = parse_num(&opt);
2857 if (cmd != 'B')
2858 opt2 = 0;
2859 else {
2860 if (*opt == 0)
2861 opt2 = 0;
2862 else if (*opt != '/')
2863 return -1; /* we expect -B80/99 or -B80 */
2864 else {
2865 opt++;
2866 opt2 = parse_num(&opt);
2867 }
2868 }
2869 if (*opt != 0)
2870 return -1;
2871 return opt1 | (opt2 << 16);
2872 }
2873
2874 struct diff_queue_struct diff_queued_diff;
2875
2876 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2877 {
2878 if (queue->alloc <= queue->nr) {
2879 queue->alloc = alloc_nr(queue->alloc);
2880 queue->queue = xrealloc(queue->queue,
2881 sizeof(dp) * queue->alloc);
2882 }
2883 queue->queue[queue->nr++] = dp;
2884 }
2885
2886 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2887 struct diff_filespec *one,
2888 struct diff_filespec *two)
2889 {
2890 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2891 dp->one = one;
2892 dp->two = two;
2893 if (queue)
2894 diff_q(queue, dp);
2895 return dp;
2896 }
2897
2898 void diff_free_filepair(struct diff_filepair *p)
2899 {
2900 free_filespec(p->one);
2901 free_filespec(p->two);
2902 free(p);
2903 }
2904
2905 /* This is different from find_unique_abbrev() in that
2906 * it stuffs the result with dots for alignment.
2907 */
2908 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2909 {
2910 int abblen;
2911 const char *abbrev;
2912 if (len == 40)
2913 return sha1_to_hex(sha1);
2914
2915 abbrev = find_unique_abbrev(sha1, len);
2916 abblen = strlen(abbrev);
2917 if (abblen < 37) {
2918 static char hex[41];
2919 if (len < abblen && abblen <= len + 2)
2920 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2921 else
2922 sprintf(hex, "%s...", abbrev);
2923 return hex;
2924 }
2925 return sha1_to_hex(sha1);
2926 }
2927
2928 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2929 {
2930 int line_termination = opt->line_termination;
2931 int inter_name_termination = line_termination ? '\t' : '\0';
2932
2933 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2934 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2935 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2936 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2937 }
2938 if (p->score) {
2939 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2940 inter_name_termination);
2941 } else {
2942 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
2943 }
2944
2945 if (p->status == DIFF_STATUS_COPIED ||
2946 p->status == DIFF_STATUS_RENAMED) {
2947 const char *name_a, *name_b;
2948 name_a = p->one->path;
2949 name_b = p->two->path;
2950 strip_prefix(opt->prefix_length, &name_a, &name_b);
2951 write_name_quoted(name_a, opt->file, inter_name_termination);
2952 write_name_quoted(name_b, opt->file, line_termination);
2953 } else {
2954 const char *name_a, *name_b;
2955 name_a = p->one->mode ? p->one->path : p->two->path;
2956 name_b = NULL;
2957 strip_prefix(opt->prefix_length, &name_a, &name_b);
2958 write_name_quoted(name_a, opt->file, line_termination);
2959 }
2960 }
2961
2962 int diff_unmodified_pair(struct diff_filepair *p)
2963 {
2964 /* This function is written stricter than necessary to support
2965 * the currently implemented transformers, but the idea is to
2966 * let transformers to produce diff_filepairs any way they want,
2967 * and filter and clean them up here before producing the output.
2968 */
2969 struct diff_filespec *one = p->one, *two = p->two;
2970
2971 if (DIFF_PAIR_UNMERGED(p))
2972 return 0; /* unmerged is interesting */
2973
2974 /* deletion, addition, mode or type change
2975 * and rename are all interesting.
2976 */
2977 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2978 DIFF_PAIR_MODE_CHANGED(p) ||
2979 strcmp(one->path, two->path))
2980 return 0;
2981
2982 /* both are valid and point at the same path. that is, we are
2983 * dealing with a change.
2984 */
2985 if (one->sha1_valid && two->sha1_valid &&
2986 !hashcmp(one->sha1, two->sha1))
2987 return 1; /* no change */
2988 if (!one->sha1_valid && !two->sha1_valid)
2989 return 1; /* both look at the same file on the filesystem. */
2990 return 0;
2991 }
2992
2993 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2994 {
2995 if (diff_unmodified_pair(p))
2996 return;
2997
2998 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2999 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3000 return; /* no tree diffs in patch format */
3001
3002 run_diff(p, o);
3003 }
3004
3005 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3006 struct diffstat_t *diffstat)
3007 {
3008 if (diff_unmodified_pair(p))
3009 return;
3010
3011 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3012 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3013 return; /* no tree diffs in patch format */
3014
3015 run_diffstat(p, o, diffstat);
3016 }
3017
3018 static void diff_flush_checkdiff(struct diff_filepair *p,
3019 struct diff_options *o)
3020 {
3021 if (diff_unmodified_pair(p))
3022 return;
3023
3024 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3025 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3026 return; /* no tree diffs in patch format */
3027
3028 run_checkdiff(p, o);
3029 }
3030
3031 int diff_queue_is_empty(void)
3032 {
3033 struct diff_queue_struct *q = &diff_queued_diff;
3034 int i;
3035 for (i = 0; i < q->nr; i++)
3036 if (!diff_unmodified_pair(q->queue[i]))
3037 return 0;
3038 return 1;
3039 }
3040
3041 #if DIFF_DEBUG
3042 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3043 {
3044 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3045 x, one ? one : "",
3046 s->path,
3047 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3048 s->mode,
3049 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3050 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3051 x, one ? one : "",
3052 s->size, s->xfrm_flags);
3053 }
3054
3055 void diff_debug_filepair(const struct diff_filepair *p, int i)
3056 {
3057 diff_debug_filespec(p->one, i, "one");
3058 diff_debug_filespec(p->two, i, "two");
3059 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3060 p->score, p->status ? p->status : '?',
3061 p->one->rename_used, p->broken_pair);
3062 }
3063
3064 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3065 {
3066 int i;
3067 if (msg)
3068 fprintf(stderr, "%s\n", msg);
3069 fprintf(stderr, "q->nr = %d\n", q->nr);
3070 for (i = 0; i < q->nr; i++) {
3071 struct diff_filepair *p = q->queue[i];
3072 diff_debug_filepair(p, i);
3073 }
3074 }
3075 #endif
3076
3077 static void diff_resolve_rename_copy(void)
3078 {
3079 int i;
3080 struct diff_filepair *p;
3081 struct diff_queue_struct *q = &diff_queued_diff;
3082
3083 diff_debug_queue("resolve-rename-copy", q);
3084
3085 for (i = 0; i < q->nr; i++) {
3086 p = q->queue[i];
3087 p->status = 0; /* undecided */
3088 if (DIFF_PAIR_UNMERGED(p))
3089 p->status = DIFF_STATUS_UNMERGED;
3090 else if (!DIFF_FILE_VALID(p->one))
3091 p->status = DIFF_STATUS_ADDED;
3092 else if (!DIFF_FILE_VALID(p->two))
3093 p->status = DIFF_STATUS_DELETED;
3094 else if (DIFF_PAIR_TYPE_CHANGED(p))
3095 p->status = DIFF_STATUS_TYPE_CHANGED;
3096
3097 /* from this point on, we are dealing with a pair
3098 * whose both sides are valid and of the same type, i.e.
3099 * either in-place edit or rename/copy edit.
3100 */
3101 else if (DIFF_PAIR_RENAME(p)) {
3102 /*
3103 * A rename might have re-connected a broken
3104 * pair up, causing the pathnames to be the
3105 * same again. If so, that's not a rename at
3106 * all, just a modification..
3107 *
3108 * Otherwise, see if this source was used for
3109 * multiple renames, in which case we decrement
3110 * the count, and call it a copy.
3111 */
3112 if (!strcmp(p->one->path, p->two->path))
3113 p->status = DIFF_STATUS_MODIFIED;
3114 else if (--p->one->rename_used > 0)
3115 p->status = DIFF_STATUS_COPIED;
3116 else
3117 p->status = DIFF_STATUS_RENAMED;
3118 }
3119 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3120 p->one->mode != p->two->mode ||
3121 is_null_sha1(p->one->sha1))
3122 p->status = DIFF_STATUS_MODIFIED;
3123 else {
3124 /* This is a "no-change" entry and should not
3125 * happen anymore, but prepare for broken callers.
3126 */
3127 error("feeding unmodified %s to diffcore",
3128 p->one->path);
3129 p->status = DIFF_STATUS_UNKNOWN;
3130 }
3131 }
3132 diff_debug_queue("resolve-rename-copy done", q);
3133 }
3134
3135 static int check_pair_status(struct diff_filepair *p)
3136 {
3137 switch (p->status) {
3138 case DIFF_STATUS_UNKNOWN:
3139 return 0;
3140 case 0:
3141 die("internal error in diff-resolve-rename-copy");
3142 default:
3143 return 1;
3144 }
3145 }
3146
3147 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3148 {
3149 int fmt = opt->output_format;
3150
3151 if (fmt & DIFF_FORMAT_CHECKDIFF)
3152 diff_flush_checkdiff(p, opt);
3153 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3154 diff_flush_raw(p, opt);
3155 else if (fmt & DIFF_FORMAT_NAME) {
3156 const char *name_a, *name_b;
3157 name_a = p->two->path;
3158 name_b = NULL;
3159 strip_prefix(opt->prefix_length, &name_a, &name_b);
3160 write_name_quoted(name_a, opt->file, opt->line_termination);
3161 }
3162 }
3163
3164 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3165 {
3166 if (fs->mode)
3167 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3168 else
3169 fprintf(file, " %s ", newdelete);
3170 write_name_quoted(fs->path, file, '\n');
3171 }
3172
3173
3174 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
3175 {
3176 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3177 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
3178 show_name ? ' ' : '\n');
3179 if (show_name) {
3180 write_name_quoted(p->two->path, file, '\n');
3181 }
3182 }
3183 }
3184
3185 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
3186 {
3187 char *names = pprint_rename(p->one->path, p->two->path);
3188
3189 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3190 free(names);
3191 show_mode_change(file, p, 0);
3192 }
3193
3194 static void diff_summary(FILE *file, struct diff_filepair *p)
3195 {
3196 switch(p->status) {
3197 case DIFF_STATUS_DELETED:
3198 show_file_mode_name(file, "delete", p->one);
3199 break;
3200 case DIFF_STATUS_ADDED:
3201 show_file_mode_name(file, "create", p->two);
3202 break;
3203 case DIFF_STATUS_COPIED:
3204 show_rename_copy(file, "copy", p);
3205 break;
3206 case DIFF_STATUS_RENAMED:
3207 show_rename_copy(file, "rename", p);
3208 break;
3209 default:
3210 if (p->score) {
3211 fputs(" rewrite ", file);
3212 write_name_quoted(p->two->path, file, ' ');
3213 fprintf(file, "(%d%%)\n", similarity_index(p));
3214 }
3215 show_mode_change(file, p, !p->score);
3216 break;
3217 }
3218 }
3219
3220 struct patch_id_t {
3221 git_SHA_CTX *ctx;
3222 int patchlen;
3223 };
3224
3225 static int remove_space(char *line, int len)
3226 {
3227 int i;
3228 char *dst = line;
3229 unsigned char c;
3230
3231 for (i = 0; i < len; i++)
3232 if (!isspace((c = line[i])))
3233 *dst++ = c;
3234
3235 return dst - line;
3236 }
3237
3238 static void patch_id_consume(void *priv, char *line, unsigned long len)
3239 {
3240 struct patch_id_t *data = priv;
3241 int new_len;
3242
3243 /* Ignore line numbers when computing the SHA1 of the patch */
3244 if (!prefixcmp(line, "@@ -"))
3245 return;
3246
3247 new_len = remove_space(line, len);
3248
3249 git_SHA1_Update(data->ctx, line, new_len);
3250 data->patchlen += new_len;
3251 }
3252
3253 /* returns 0 upon success, and writes result into sha1 */
3254 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3255 {
3256 struct diff_queue_struct *q = &diff_queued_diff;
3257 int i;
3258 git_SHA_CTX ctx;
3259 struct patch_id_t data;
3260 char buffer[PATH_MAX * 4 + 20];
3261
3262 git_SHA1_Init(&ctx);
3263 memset(&data, 0, sizeof(struct patch_id_t));
3264 data.ctx = &ctx;
3265
3266 for (i = 0; i < q->nr; i++) {
3267 xpparam_t xpp;
3268 xdemitconf_t xecfg;
3269 xdemitcb_t ecb;
3270 mmfile_t mf1, mf2;
3271 struct diff_filepair *p = q->queue[i];
3272 int len1, len2;
3273
3274 memset(&xpp, 0, sizeof(xpp));
3275 memset(&xecfg, 0, sizeof(xecfg));
3276 if (p->status == 0)
3277 return error("internal diff status error");
3278 if (p->status == DIFF_STATUS_UNKNOWN)
3279 continue;
3280 if (diff_unmodified_pair(p))
3281 continue;
3282 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3283 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3284 continue;
3285 if (DIFF_PAIR_UNMERGED(p))
3286 continue;
3287
3288 diff_fill_sha1_info(p->one);
3289 diff_fill_sha1_info(p->two);
3290 if (fill_mmfile(&mf1, p->one) < 0 ||
3291 fill_mmfile(&mf2, p->two) < 0)
3292 return error("unable to read files to diff");
3293
3294 len1 = remove_space(p->one->path, strlen(p->one->path));
3295 len2 = remove_space(p->two->path, strlen(p->two->path));
3296 if (p->one->mode == 0)
3297 len1 = snprintf(buffer, sizeof(buffer),
3298 "diff--gita/%.*sb/%.*s"
3299 "newfilemode%06o"
3300 "---/dev/null"
3301 "+++b/%.*s",
3302 len1, p->one->path,
3303 len2, p->two->path,
3304 p->two->mode,
3305 len2, p->two->path);
3306 else if (p->two->mode == 0)
3307 len1 = snprintf(buffer, sizeof(buffer),
3308 "diff--gita/%.*sb/%.*s"
3309 "deletedfilemode%06o"
3310 "---a/%.*s"
3311 "+++/dev/null",
3312 len1, p->one->path,
3313 len2, p->two->path,
3314 p->one->mode,
3315 len1, p->one->path);
3316 else
3317 len1 = snprintf(buffer, sizeof(buffer),
3318 "diff--gita/%.*sb/%.*s"
3319 "---a/%.*s"
3320 "+++b/%.*s",
3321 len1, p->one->path,
3322 len2, p->two->path,
3323 len1, p->one->path,
3324 len2, p->two->path);
3325 git_SHA1_Update(&ctx, buffer, len1);
3326
3327 xpp.flags = XDF_NEED_MINIMAL;
3328 xecfg.ctxlen = 3;
3329 xecfg.flags = XDL_EMIT_FUNCNAMES;
3330 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3331 &xpp, &xecfg, &ecb);
3332 }
3333
3334 git_SHA1_Final(sha1, &ctx);
3335 return 0;
3336 }
3337
3338 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3339 {
3340 struct diff_queue_struct *q = &diff_queued_diff;
3341 int i;
3342 int result = diff_get_patch_id(options, sha1);
3343
3344 for (i = 0; i < q->nr; i++)
3345 diff_free_filepair(q->queue[i]);
3346
3347 free(q->queue);
3348 q->queue = NULL;
3349 q->nr = q->alloc = 0;
3350
3351 return result;
3352 }
3353
3354 static int is_summary_empty(const struct diff_queue_struct *q)
3355 {
3356 int i;
3357
3358 for (i = 0; i < q->nr; i++) {
3359 const struct diff_filepair *p = q->queue[i];
3360
3361 switch (p->status) {
3362 case DIFF_STATUS_DELETED:
3363 case DIFF_STATUS_ADDED:
3364 case DIFF_STATUS_COPIED:
3365 case DIFF_STATUS_RENAMED:
3366 return 0;
3367 default:
3368 if (p->score)
3369 return 0;
3370 if (p->one->mode && p->two->mode &&
3371 p->one->mode != p->two->mode)
3372 return 0;
3373 break;
3374 }
3375 }
3376 return 1;
3377 }
3378
3379 void diff_flush(struct diff_options *options)
3380 {
3381 struct diff_queue_struct *q = &diff_queued_diff;
3382 int i, output_format = options->output_format;
3383 int separator = 0;
3384
3385 /*
3386 * Order: raw, stat, summary, patch
3387 * or: name/name-status/checkdiff (other bits clear)
3388 */
3389 if (!q->nr)
3390 goto free_queue;
3391
3392 if (output_format & (DIFF_FORMAT_RAW |
3393 DIFF_FORMAT_NAME |
3394 DIFF_FORMAT_NAME_STATUS |
3395 DIFF_FORMAT_CHECKDIFF)) {
3396 for (i = 0; i < q->nr; i++) {
3397 struct diff_filepair *p = q->queue[i];
3398 if (check_pair_status(p))
3399 flush_one_pair(p, options);
3400 }
3401 separator++;
3402 }
3403
3404 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3405 struct diffstat_t diffstat;
3406
3407 memset(&diffstat, 0, sizeof(struct diffstat_t));
3408 for (i = 0; i < q->nr; i++) {
3409 struct diff_filepair *p = q->queue[i];
3410 if (check_pair_status(p))
3411 diff_flush_stat(p, options, &diffstat);
3412 }
3413 if (output_format & DIFF_FORMAT_NUMSTAT)
3414 show_numstat(&diffstat, options);
3415 if (output_format & DIFF_FORMAT_DIFFSTAT)
3416 show_stats(&diffstat, options);
3417 if (output_format & DIFF_FORMAT_SHORTSTAT)
3418 show_shortstats(&diffstat, options);
3419 free_diffstat_info(&diffstat);
3420 separator++;
3421 }
3422 if (output_format & DIFF_FORMAT_DIRSTAT)
3423 show_dirstat(options);
3424
3425 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3426 for (i = 0; i < q->nr; i++)
3427 diff_summary(options->file, q->queue[i]);
3428 separator++;
3429 }
3430
3431 if (output_format & DIFF_FORMAT_PATCH) {
3432 if (separator) {
3433 putc(options->line_termination, options->file);
3434 if (options->stat_sep) {
3435 /* attach patch instead of inline */
3436 fputs(options->stat_sep, options->file);
3437 }
3438 }
3439
3440 for (i = 0; i < q->nr; i++) {
3441 struct diff_filepair *p = q->queue[i];
3442 if (check_pair_status(p))
3443 diff_flush_patch(p, options);
3444 }
3445 }
3446
3447 if (output_format & DIFF_FORMAT_CALLBACK)
3448 options->format_callback(q, options, options->format_callback_data);
3449
3450 for (i = 0; i < q->nr; i++)
3451 diff_free_filepair(q->queue[i]);
3452 free_queue:
3453 free(q->queue);
3454 q->queue = NULL;
3455 q->nr = q->alloc = 0;
3456 if (options->close_file)
3457 fclose(options->file);
3458 }
3459
3460 static void diffcore_apply_filter(const char *filter)
3461 {
3462 int i;
3463 struct diff_queue_struct *q = &diff_queued_diff;
3464 struct diff_queue_struct outq;
3465 outq.queue = NULL;
3466 outq.nr = outq.alloc = 0;
3467
3468 if (!filter)
3469 return;
3470
3471 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3472 int found;
3473 for (i = found = 0; !found && i < q->nr; i++) {
3474 struct diff_filepair *p = q->queue[i];
3475 if (((p->status == DIFF_STATUS_MODIFIED) &&
3476 ((p->score &&
3477 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3478 (!p->score &&
3479 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3480 ((p->status != DIFF_STATUS_MODIFIED) &&
3481 strchr(filter, p->status)))
3482 found++;
3483 }
3484 if (found)
3485 return;
3486
3487 /* otherwise we will clear the whole queue
3488 * by copying the empty outq at the end of this
3489 * function, but first clear the current entries
3490 * in the queue.
3491 */
3492 for (i = 0; i < q->nr; i++)
3493 diff_free_filepair(q->queue[i]);
3494 }
3495 else {
3496 /* Only the matching ones */
3497 for (i = 0; i < q->nr; i++) {
3498 struct diff_filepair *p = q->queue[i];
3499
3500 if (((p->status == DIFF_STATUS_MODIFIED) &&
3501 ((p->score &&
3502 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3503 (!p->score &&
3504 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3505 ((p->status != DIFF_STATUS_MODIFIED) &&
3506 strchr(filter, p->status)))
3507 diff_q(&outq, p);
3508 else
3509 diff_free_filepair(p);
3510 }
3511 }
3512 free(q->queue);
3513 *q = outq;
3514 }
3515
3516 /* Check whether two filespecs with the same mode and size are identical */
3517 static int diff_filespec_is_identical(struct diff_filespec *one,
3518 struct diff_filespec *two)
3519 {
3520 if (S_ISGITLINK(one->mode))
3521 return 0;
3522 if (diff_populate_filespec(one, 0))
3523 return 0;
3524 if (diff_populate_filespec(two, 0))
3525 return 0;
3526 return !memcmp(one->data, two->data, one->size);
3527 }
3528
3529 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3530 {
3531 int i;
3532 struct diff_queue_struct *q = &diff_queued_diff;
3533 struct diff_queue_struct outq;
3534 outq.queue = NULL;
3535 outq.nr = outq.alloc = 0;
3536
3537 for (i = 0; i < q->nr; i++) {
3538 struct diff_filepair *p = q->queue[i];
3539
3540 /*
3541 * 1. Entries that come from stat info dirtyness
3542 * always have both sides (iow, not create/delete),
3543 * one side of the object name is unknown, with
3544 * the same mode and size. Keep the ones that
3545 * do not match these criteria. They have real
3546 * differences.
3547 *
3548 * 2. At this point, the file is known to be modified,
3549 * with the same mode and size, and the object
3550 * name of one side is unknown. Need to inspect
3551 * the identical contents.
3552 */
3553 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3554 !DIFF_FILE_VALID(p->two) ||
3555 (p->one->sha1_valid && p->two->sha1_valid) ||
3556 (p->one->mode != p->two->mode) ||
3557 diff_populate_filespec(p->one, 1) ||
3558 diff_populate_filespec(p->two, 1) ||
3559 (p->one->size != p->two->size) ||
3560 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3561 diff_q(&outq, p);
3562 else {
3563 /*
3564 * The caller can subtract 1 from skip_stat_unmatch
3565 * to determine how many paths were dirty only
3566 * due to stat info mismatch.
3567 */
3568 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3569 diffopt->skip_stat_unmatch++;
3570 diff_free_filepair(p);
3571 }
3572 }
3573 free(q->queue);
3574 *q = outq;
3575 }
3576
3577 void diffcore_std(struct diff_options *options)
3578 {
3579 if (options->skip_stat_unmatch)
3580 diffcore_skip_stat_unmatch(options);
3581 if (options->break_opt != -1)
3582 diffcore_break(options->break_opt);
3583 if (options->detect_rename)
3584 diffcore_rename(options);
3585 if (options->break_opt != -1)
3586 diffcore_merge_broken();
3587 if (options->pickaxe)
3588 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3589 if (options->orderfile)
3590 diffcore_order(options->orderfile);
3591 diff_resolve_rename_copy();
3592 diffcore_apply_filter(options->filter);
3593
3594 if (diff_queued_diff.nr)
3595 DIFF_OPT_SET(options, HAS_CHANGES);
3596 else
3597 DIFF_OPT_CLR(options, HAS_CHANGES);
3598 }
3599
3600 int diff_result_code(struct diff_options *opt, int status)
3601 {
3602 int result = 0;
3603 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3604 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3605 return status;
3606 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3607 DIFF_OPT_TST(opt, HAS_CHANGES))
3608 result |= 01;
3609 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3610 DIFF_OPT_TST(opt, CHECK_FAILED))
3611 result |= 02;
3612 return result;
3613 }
3614
3615 void diff_addremove(struct diff_options *options,
3616 int addremove, unsigned mode,
3617 const unsigned char *sha1,
3618 const char *concatpath)
3619 {
3620 struct diff_filespec *one, *two;
3621
3622 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3623 return;
3624
3625 /* This may look odd, but it is a preparation for
3626 * feeding "there are unchanged files which should
3627 * not produce diffs, but when you are doing copy
3628 * detection you would need them, so here they are"
3629 * entries to the diff-core. They will be prefixed
3630 * with something like '=' or '*' (I haven't decided
3631 * which but should not make any difference).
3632 * Feeding the same new and old to diff_change()
3633 * also has the same effect.
3634 * Before the final output happens, they are pruned after
3635 * merged into rename/copy pairs as appropriate.
3636 */
3637 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3638 addremove = (addremove == '+' ? '-' :
3639 addremove == '-' ? '+' : addremove);
3640
3641 if (options->prefix &&
3642 strncmp(concatpath, options->prefix, options->prefix_length))
3643 return;
3644
3645 one = alloc_filespec(concatpath);
3646 two = alloc_filespec(concatpath);
3647
3648 if (addremove != '+')
3649 fill_filespec(one, sha1, mode);
3650 if (addremove != '-')
3651 fill_filespec(two, sha1, mode);
3652
3653 diff_queue(&diff_queued_diff, one, two);
3654 DIFF_OPT_SET(options, HAS_CHANGES);
3655 }
3656
3657 void diff_change(struct diff_options *options,
3658 unsigned old_mode, unsigned new_mode,
3659 const unsigned char *old_sha1,
3660 const unsigned char *new_sha1,
3661 const char *concatpath)
3662 {
3663 struct diff_filespec *one, *two;
3664
3665 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3666 && S_ISGITLINK(new_mode))
3667 return;
3668
3669 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3670 unsigned tmp;
3671 const unsigned char *tmp_c;
3672 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3673 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3674 }
3675
3676 if (options->prefix &&
3677 strncmp(concatpath, options->prefix, options->prefix_length))
3678 return;
3679
3680 one = alloc_filespec(concatpath);
3681 two = alloc_filespec(concatpath);
3682 fill_filespec(one, old_sha1, old_mode);
3683 fill_filespec(two, new_sha1, new_mode);
3684
3685 diff_queue(&diff_queued_diff, one, two);
3686 DIFF_OPT_SET(options, HAS_CHANGES);
3687 }
3688
3689 void diff_unmerge(struct diff_options *options,
3690 const char *path,
3691 unsigned mode, const unsigned char *sha1)
3692 {
3693 struct diff_filespec *one, *two;
3694
3695 if (options->prefix &&
3696 strncmp(path, options->prefix, options->prefix_length))
3697 return;
3698
3699 one = alloc_filespec(path);
3700 two = alloc_filespec(path);
3701 fill_filespec(one, sha1, mode);
3702 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3703 }
3704
3705 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
3706 size_t *outsize)
3707 {
3708 struct diff_tempfile *temp;
3709 const char *argv[3];
3710 const char **arg = argv;
3711 struct child_process child;
3712 struct strbuf buf = STRBUF_INIT;
3713
3714 temp = prepare_temp_file(spec->path, spec);
3715 *arg++ = pgm;
3716 *arg++ = temp->name;
3717 *arg = NULL;
3718
3719 memset(&child, 0, sizeof(child));
3720 child.argv = argv;
3721 child.out = -1;
3722 if (start_command(&child) != 0 ||
3723 strbuf_read(&buf, child.out, 0) < 0 ||
3724 finish_command(&child) != 0) {
3725 close(child.out);
3726 strbuf_release(&buf);
3727 remove_tempfile();
3728 error("error running textconv command '%s'", pgm);
3729 return NULL;
3730 }
3731 close(child.out);
3732 remove_tempfile();
3733
3734 return strbuf_detach(&buf, outsize);
3735 }
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