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update-server-info: Shorten read_pack_info_file()
[git/jnareb-git.git] / diff.c
blob57e1212fbcc9783d3fdbd248762247d8e0efd886
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18
19 #ifdef NO_FAST_WORKING_DIRECTORY
20 #define FAST_WORKING_DIRECTORY 0
21 #else
22 #define FAST_WORKING_DIRECTORY 1
23 #endif
24
25 static int diff_detect_rename_default;
26 static int diff_rename_limit_default = 200;
27 static int diff_suppress_blank_empty;
28 int diff_use_color_default = -1;
29 static const char *diff_word_regex_cfg;
30 static const char *external_diff_cmd_cfg;
31 int diff_auto_refresh_index = 1;
32 static int diff_mnemonic_prefix;
33
34 static char diff_colors[][COLOR_MAXLEN] = {
35 GIT_COLOR_RESET,
36 GIT_COLOR_NORMAL, /* PLAIN */
37 GIT_COLOR_BOLD, /* METAINFO */
38 GIT_COLOR_CYAN, /* FRAGINFO */
39 GIT_COLOR_RED, /* OLD */
40 GIT_COLOR_GREEN, /* NEW */
41 GIT_COLOR_YELLOW, /* COMMIT */
42 GIT_COLOR_BG_RED, /* WHITESPACE */
43 GIT_COLOR_NORMAL, /* FUNCINFO */
44 };
45
46 static void diff_filespec_load_driver(struct diff_filespec *one);
47 static char *run_textconv(const char *, struct diff_filespec *, size_t *);
48
49 static int parse_diff_color_slot(const char *var, int ofs)
50 {
51 if (!strcasecmp(var+ofs, "plain"))
52 return DIFF_PLAIN;
53 if (!strcasecmp(var+ofs, "meta"))
54 return DIFF_METAINFO;
55 if (!strcasecmp(var+ofs, "frag"))
56 return DIFF_FRAGINFO;
57 if (!strcasecmp(var+ofs, "old"))
58 return DIFF_FILE_OLD;
59 if (!strcasecmp(var+ofs, "new"))
60 return DIFF_FILE_NEW;
61 if (!strcasecmp(var+ofs, "commit"))
62 return DIFF_COMMIT;
63 if (!strcasecmp(var+ofs, "whitespace"))
64 return DIFF_WHITESPACE;
65 if (!strcasecmp(var+ofs, "func"))
66 return DIFF_FUNCINFO;
67 return -1;
68 }
69
70 static int git_config_rename(const char *var, const char *value)
71 {
72 if (!value)
73 return DIFF_DETECT_RENAME;
74 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
75 return DIFF_DETECT_COPY;
76 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
77 }
78
79 /*
80 * These are to give UI layer defaults.
81 * The core-level commands such as git-diff-files should
82 * never be affected by the setting of diff.renames
83 * the user happens to have in the configuration file.
84 */
85 int git_diff_ui_config(const char *var, const char *value, void *cb)
86 {
87 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
88 diff_use_color_default = git_config_colorbool(var, value, -1);
89 return 0;
90 }
91 if (!strcmp(var, "diff.renames")) {
92 diff_detect_rename_default = git_config_rename(var, value);
93 return 0;
94 }
95 if (!strcmp(var, "diff.autorefreshindex")) {
96 diff_auto_refresh_index = git_config_bool(var, value);
97 return 0;
98 }
99 if (!strcmp(var, "diff.mnemonicprefix")) {
100 diff_mnemonic_prefix = git_config_bool(var, value);
101 return 0;
102 }
103 if (!strcmp(var, "diff.external"))
104 return git_config_string(&external_diff_cmd_cfg, var, value);
105 if (!strcmp(var, "diff.wordregex"))
106 return git_config_string(&diff_word_regex_cfg, var, value);
107
108 return git_diff_basic_config(var, value, cb);
109 }
110
111 int git_diff_basic_config(const char *var, const char *value, void *cb)
112 {
113 if (!strcmp(var, "diff.renamelimit")) {
114 diff_rename_limit_default = git_config_int(var, value);
115 return 0;
116 }
117
118 switch (userdiff_config(var, value)) {
119 case 0: break;
120 case -1: return -1;
121 default: return 0;
122 }
123
124 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
125 int slot = parse_diff_color_slot(var, 11);
126 if (slot < 0)
127 return 0;
128 if (!value)
129 return config_error_nonbool(var);
130 color_parse(value, var, diff_colors[slot]);
131 return 0;
132 }
133
134 /* like GNU diff's --suppress-blank-empty option */
135 if (!strcmp(var, "diff.suppressblankempty") ||
136 /* for backwards compatibility */
137 !strcmp(var, "diff.suppress-blank-empty")) {
138 diff_suppress_blank_empty = git_config_bool(var, value);
139 return 0;
140 }
141
142 return git_color_default_config(var, value, cb);
143 }
144
145 static char *quote_two(const char *one, const char *two)
146 {
147 int need_one = quote_c_style(one, NULL, NULL, 1);
148 int need_two = quote_c_style(two, NULL, NULL, 1);
149 struct strbuf res = STRBUF_INIT;
150
151 if (need_one + need_two) {
152 strbuf_addch(&res, '"');
153 quote_c_style(one, &res, NULL, 1);
154 quote_c_style(two, &res, NULL, 1);
155 strbuf_addch(&res, '"');
156 } else {
157 strbuf_addstr(&res, one);
158 strbuf_addstr(&res, two);
159 }
160 return strbuf_detach(&res, NULL);
161 }
162
163 static const char *external_diff(void)
164 {
165 static const char *external_diff_cmd = NULL;
166 static int done_preparing = 0;
167
168 if (done_preparing)
169 return external_diff_cmd;
170 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
171 if (!external_diff_cmd)
172 external_diff_cmd = external_diff_cmd_cfg;
173 done_preparing = 1;
174 return external_diff_cmd;
175 }
176
177 static struct diff_tempfile {
178 const char *name; /* filename external diff should read from */
179 char hex[41];
180 char mode[10];
181 char tmp_path[PATH_MAX];
182 } diff_temp[2];
183
184 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
185
186 struct emit_callback {
187 int color_diff;
188 unsigned ws_rule;
189 int blank_at_eof_in_preimage;
190 int blank_at_eof_in_postimage;
191 int lno_in_preimage;
192 int lno_in_postimage;
193 sane_truncate_fn truncate;
194 const char **label_path;
195 struct diff_words_data *diff_words;
196 int *found_changesp;
197 FILE *file;
198 struct strbuf *header;
199 };
200
201 static int count_lines(const char *data, int size)
202 {
203 int count, ch, completely_empty = 1, nl_just_seen = 0;
204 count = 0;
205 while (0 < size--) {
206 ch = *data++;
207 if (ch == '\n') {
208 count++;
209 nl_just_seen = 1;
210 completely_empty = 0;
211 }
212 else {
213 nl_just_seen = 0;
214 completely_empty = 0;
215 }
216 }
217 if (completely_empty)
218 return 0;
219 if (!nl_just_seen)
220 count++; /* no trailing newline */
221 return count;
222 }
223
224 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
225 {
226 if (!DIFF_FILE_VALID(one)) {
227 mf->ptr = (char *)""; /* does not matter */
228 mf->size = 0;
229 return 0;
230 }
231 else if (diff_populate_filespec(one, 0))
232 return -1;
233
234 mf->ptr = one->data;
235 mf->size = one->size;
236 return 0;
237 }
238
239 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
240 {
241 char *ptr = mf->ptr;
242 long size = mf->size;
243 int cnt = 0;
244
245 if (!size)
246 return cnt;
247 ptr += size - 1; /* pointing at the very end */
248 if (*ptr != '\n')
249 ; /* incomplete line */
250 else
251 ptr--; /* skip the last LF */
252 while (mf->ptr < ptr) {
253 char *prev_eol;
254 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
255 if (*prev_eol == '\n')
256 break;
257 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
258 break;
259 cnt++;
260 ptr = prev_eol - 1;
261 }
262 return cnt;
263 }
264
265 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
266 struct emit_callback *ecbdata)
267 {
268 int l1, l2, at;
269 unsigned ws_rule = ecbdata->ws_rule;
270 l1 = count_trailing_blank(mf1, ws_rule);
271 l2 = count_trailing_blank(mf2, ws_rule);
272 if (l2 <= l1) {
273 ecbdata->blank_at_eof_in_preimage = 0;
274 ecbdata->blank_at_eof_in_postimage = 0;
275 return;
276 }
277 at = count_lines(mf1->ptr, mf1->size);
278 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
279
280 at = count_lines(mf2->ptr, mf2->size);
281 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
282 }
283
284 static void emit_line_0(FILE *file, const char *set, const char *reset,
285 int first, const char *line, int len)
286 {
287 int has_trailing_newline, has_trailing_carriage_return;
288 int nofirst;
289
290 if (len == 0) {
291 has_trailing_newline = (first == '\n');
292 has_trailing_carriage_return = (!has_trailing_newline &&
293 (first == '\r'));
294 nofirst = has_trailing_newline || has_trailing_carriage_return;
295 } else {
296 has_trailing_newline = (len > 0 && line[len-1] == '\n');
297 if (has_trailing_newline)
298 len--;
299 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
300 if (has_trailing_carriage_return)
301 len--;
302 nofirst = 0;
303 }
304
305 if (len || !nofirst) {
306 fputs(set, file);
307 if (!nofirst)
308 fputc(first, file);
309 fwrite(line, len, 1, file);
310 fputs(reset, file);
311 }
312 if (has_trailing_carriage_return)
313 fputc('\r', file);
314 if (has_trailing_newline)
315 fputc('\n', file);
316 }
317
318 static void emit_line(FILE *file, const char *set, const char *reset,
319 const char *line, int len)
320 {
321 emit_line_0(file, set, reset, line[0], line+1, len-1);
322 }
323
324 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
325 {
326 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
327 ecbdata->blank_at_eof_in_preimage &&
328 ecbdata->blank_at_eof_in_postimage &&
329 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
330 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
331 return 0;
332 return ws_blank_line(line, len, ecbdata->ws_rule);
333 }
334
335 static void emit_add_line(const char *reset,
336 struct emit_callback *ecbdata,
337 const char *line, int len)
338 {
339 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
340 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
341
342 if (!*ws)
343 emit_line_0(ecbdata->file, set, reset, '+', line, len);
344 else if (new_blank_line_at_eof(ecbdata, line, len))
345 /* Blank line at EOF - paint '+' as well */
346 emit_line_0(ecbdata->file, ws, reset, '+', line, len);
347 else {
348 /* Emit just the prefix, then the rest. */
349 emit_line_0(ecbdata->file, set, reset, '+', "", 0);
350 ws_check_emit(line, len, ecbdata->ws_rule,
351 ecbdata->file, set, reset, ws);
352 }
353 }
354
355 static void emit_hunk_header(struct emit_callback *ecbdata,
356 const char *line, int len)
357 {
358 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
359 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
360 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
361 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
362 static const char atat[2] = { '@', '@' };
363 const char *cp, *ep;
364
365 /*
366 * As a hunk header must begin with "@@ -<old>, +<new> @@",
367 * it always is at least 10 bytes long.
368 */
369 if (len < 10 ||
370 memcmp(line, atat, 2) ||
371 !(ep = memmem(line + 2, len - 2, atat, 2))) {
372 emit_line(ecbdata->file, plain, reset, line, len);
373 return;
374 }
375 ep += 2; /* skip over @@ */
376
377 /* The hunk header in fraginfo color */
378 emit_line(ecbdata->file, frag, reset, line, ep - line);
379
380 /* blank before the func header */
381 for (cp = ep; ep - line < len; ep++)
382 if (*ep != ' ' && *ep != '\t')
383 break;
384 if (ep != cp)
385 emit_line(ecbdata->file, plain, reset, cp, ep - cp);
386
387 if (ep < line + len)
388 emit_line(ecbdata->file, func, reset, ep, line + len - ep);
389 }
390
391 static struct diff_tempfile *claim_diff_tempfile(void) {
392 int i;
393 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
394 if (!diff_temp[i].name)
395 return diff_temp + i;
396 die("BUG: diff is failing to clean up its tempfiles");
397 }
398
399 static int remove_tempfile_installed;
400
401 static void remove_tempfile(void)
402 {
403 int i;
404 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
405 if (diff_temp[i].name == diff_temp[i].tmp_path)
406 unlink_or_warn(diff_temp[i].name);
407 diff_temp[i].name = NULL;
408 }
409 }
410
411 static void remove_tempfile_on_signal(int signo)
412 {
413 remove_tempfile();
414 sigchain_pop(signo);
415 raise(signo);
416 }
417
418 static void print_line_count(FILE *file, int count)
419 {
420 switch (count) {
421 case 0:
422 fprintf(file, "0,0");
423 break;
424 case 1:
425 fprintf(file, "1");
426 break;
427 default:
428 fprintf(file, "1,%d", count);
429 break;
430 }
431 }
432
433 static void emit_rewrite_lines(struct emit_callback *ecb,
434 int prefix, const char *data, int size)
435 {
436 const char *endp = NULL;
437 static const char *nneof = " No newline at end of file\n";
438 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
439 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
440
441 while (0 < size) {
442 int len;
443
444 endp = memchr(data, '\n', size);
445 len = endp ? (endp - data + 1) : size;
446 if (prefix != '+') {
447 ecb->lno_in_preimage++;
448 emit_line_0(ecb->file, old, reset, '-',
449 data, len);
450 } else {
451 ecb->lno_in_postimage++;
452 emit_add_line(reset, ecb, data, len);
453 }
454 size -= len;
455 data += len;
456 }
457 if (!endp) {
458 const char *plain = diff_get_color(ecb->color_diff,
459 DIFF_PLAIN);
460 emit_line_0(ecb->file, plain, reset, '\\',
461 nneof, strlen(nneof));
462 }
463 }
464
465 static void emit_rewrite_diff(const char *name_a,
466 const char *name_b,
467 struct diff_filespec *one,
468 struct diff_filespec *two,
469 const char *textconv_one,
470 const char *textconv_two,
471 struct diff_options *o)
472 {
473 int lc_a, lc_b;
474 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
475 const char *name_a_tab, *name_b_tab;
476 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
477 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
478 const char *reset = diff_get_color(color_diff, DIFF_RESET);
479 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
480 const char *a_prefix, *b_prefix;
481 const char *data_one, *data_two;
482 size_t size_one, size_two;
483 struct emit_callback ecbdata;
484
485 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
486 a_prefix = o->b_prefix;
487 b_prefix = o->a_prefix;
488 } else {
489 a_prefix = o->a_prefix;
490 b_prefix = o->b_prefix;
491 }
492
493 name_a += (*name_a == '/');
494 name_b += (*name_b == '/');
495 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
496 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
497
498 strbuf_reset(&a_name);
499 strbuf_reset(&b_name);
500 quote_two_c_style(&a_name, a_prefix, name_a, 0);
501 quote_two_c_style(&b_name, b_prefix, name_b, 0);
502
503 diff_populate_filespec(one, 0);
504 diff_populate_filespec(two, 0);
505 if (textconv_one) {
506 data_one = run_textconv(textconv_one, one, &size_one);
507 if (!data_one)
508 die("unable to read files to diff");
509 }
510 else {
511 data_one = one->data;
512 size_one = one->size;
513 }
514 if (textconv_two) {
515 data_two = run_textconv(textconv_two, two, &size_two);
516 if (!data_two)
517 die("unable to read files to diff");
518 }
519 else {
520 data_two = two->data;
521 size_two = two->size;
522 }
523
524 memset(&ecbdata, 0, sizeof(ecbdata));
525 ecbdata.color_diff = color_diff;
526 ecbdata.found_changesp = &o->found_changes;
527 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
528 ecbdata.file = o->file;
529 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
530 mmfile_t mf1, mf2;
531 mf1.ptr = (char *)data_one;
532 mf2.ptr = (char *)data_two;
533 mf1.size = size_one;
534 mf2.size = size_two;
535 check_blank_at_eof(&mf1, &mf2, &ecbdata);
536 }
537 ecbdata.lno_in_preimage = 1;
538 ecbdata.lno_in_postimage = 1;
539
540 lc_a = count_lines(data_one, size_one);
541 lc_b = count_lines(data_two, size_two);
542 fprintf(o->file,
543 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
544 metainfo, a_name.buf, name_a_tab, reset,
545 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
546 print_line_count(o->file, lc_a);
547 fprintf(o->file, " +");
548 print_line_count(o->file, lc_b);
549 fprintf(o->file, " @@%s\n", reset);
550 if (lc_a)
551 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
552 if (lc_b)
553 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
554 if (textconv_one)
555 free((char *)data_one);
556 if (textconv_two)
557 free((char *)data_two);
558 }
559
560 struct diff_words_buffer {
561 mmfile_t text;
562 long alloc;
563 struct diff_words_orig {
564 const char *begin, *end;
565 } *orig;
566 int orig_nr, orig_alloc;
567 };
568
569 static void diff_words_append(char *line, unsigned long len,
570 struct diff_words_buffer *buffer)
571 {
572 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
573 line++;
574 len--;
575 memcpy(buffer->text.ptr + buffer->text.size, line, len);
576 buffer->text.size += len;
577 buffer->text.ptr[buffer->text.size] = '\0';
578 }
579
580 struct diff_words_data {
581 struct diff_words_buffer minus, plus;
582 const char *current_plus;
583 FILE *file;
584 regex_t *word_regex;
585 };
586
587 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
588 {
589 struct diff_words_data *diff_words = priv;
590 int minus_first, minus_len, plus_first, plus_len;
591 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
592
593 if (line[0] != '@' || parse_hunk_header(line, len,
594 &minus_first, &minus_len, &plus_first, &plus_len))
595 return;
596
597 /* POSIX requires that first be decremented by one if len == 0... */
598 if (minus_len) {
599 minus_begin = diff_words->minus.orig[minus_first].begin;
600 minus_end =
601 diff_words->minus.orig[minus_first + minus_len - 1].end;
602 } else
603 minus_begin = minus_end =
604 diff_words->minus.orig[minus_first].end;
605
606 if (plus_len) {
607 plus_begin = diff_words->plus.orig[plus_first].begin;
608 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
609 } else
610 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
611
612 if (diff_words->current_plus != plus_begin)
613 fwrite(diff_words->current_plus,
614 plus_begin - diff_words->current_plus, 1,
615 diff_words->file);
616 if (minus_begin != minus_end)
617 color_fwrite_lines(diff_words->file,
618 diff_get_color(1, DIFF_FILE_OLD),
619 minus_end - minus_begin, minus_begin);
620 if (plus_begin != plus_end)
621 color_fwrite_lines(diff_words->file,
622 diff_get_color(1, DIFF_FILE_NEW),
623 plus_end - plus_begin, plus_begin);
624
625 diff_words->current_plus = plus_end;
626 }
627
628 /* This function starts looking at *begin, and returns 0 iff a word was found. */
629 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
630 int *begin, int *end)
631 {
632 if (word_regex && *begin < buffer->size) {
633 regmatch_t match[1];
634 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
635 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
636 '\n', match[0].rm_eo - match[0].rm_so);
637 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
638 *begin += match[0].rm_so;
639 return *begin >= *end;
640 }
641 return -1;
642 }
643
644 /* find the next word */
645 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
646 (*begin)++;
647 if (*begin >= buffer->size)
648 return -1;
649
650 /* find the end of the word */
651 *end = *begin + 1;
652 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
653 (*end)++;
654
655 return 0;
656 }
657
658 /*
659 * This function splits the words in buffer->text, stores the list with
660 * newline separator into out, and saves the offsets of the original words
661 * in buffer->orig.
662 */
663 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
664 regex_t *word_regex)
665 {
666 int i, j;
667 long alloc = 0;
668
669 out->size = 0;
670 out->ptr = NULL;
671
672 /* fake an empty "0th" word */
673 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
674 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
675 buffer->orig_nr = 1;
676
677 for (i = 0; i < buffer->text.size; i++) {
678 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
679 return;
680
681 /* store original boundaries */
682 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
683 buffer->orig_alloc);
684 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
685 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
686 buffer->orig_nr++;
687
688 /* store one word */
689 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
690 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
691 out->ptr[out->size + j - i] = '\n';
692 out->size += j - i + 1;
693
694 i = j - 1;
695 }
696 }
697
698 /* this executes the word diff on the accumulated buffers */
699 static void diff_words_show(struct diff_words_data *diff_words)
700 {
701 xpparam_t xpp;
702 xdemitconf_t xecfg;
703 mmfile_t minus, plus;
704
705 /* special case: only removal */
706 if (!diff_words->plus.text.size) {
707 color_fwrite_lines(diff_words->file,
708 diff_get_color(1, DIFF_FILE_OLD),
709 diff_words->minus.text.size, diff_words->minus.text.ptr);
710 diff_words->minus.text.size = 0;
711 return;
712 }
713
714 diff_words->current_plus = diff_words->plus.text.ptr;
715
716 memset(&xpp, 0, sizeof(xpp));
717 memset(&xecfg, 0, sizeof(xecfg));
718 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
719 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
720 xpp.flags = 0;
721 /* as only the hunk header will be parsed, we need a 0-context */
722 xecfg.ctxlen = 0;
723 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
724 &xpp, &xecfg);
725 free(minus.ptr);
726 free(plus.ptr);
727 if (diff_words->current_plus != diff_words->plus.text.ptr +
728 diff_words->plus.text.size)
729 fwrite(diff_words->current_plus,
730 diff_words->plus.text.ptr + diff_words->plus.text.size
731 - diff_words->current_plus, 1,
732 diff_words->file);
733 diff_words->minus.text.size = diff_words->plus.text.size = 0;
734 }
735
736 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
737 static void diff_words_flush(struct emit_callback *ecbdata)
738 {
739 if (ecbdata->diff_words->minus.text.size ||
740 ecbdata->diff_words->plus.text.size)
741 diff_words_show(ecbdata->diff_words);
742 }
743
744 static void free_diff_words_data(struct emit_callback *ecbdata)
745 {
746 if (ecbdata->diff_words) {
747 diff_words_flush(ecbdata);
748 free (ecbdata->diff_words->minus.text.ptr);
749 free (ecbdata->diff_words->minus.orig);
750 free (ecbdata->diff_words->plus.text.ptr);
751 free (ecbdata->diff_words->plus.orig);
752 free(ecbdata->diff_words->word_regex);
753 free(ecbdata->diff_words);
754 ecbdata->diff_words = NULL;
755 }
756 }
757
758 const char *diff_get_color(int diff_use_color, enum color_diff ix)
759 {
760 if (diff_use_color)
761 return diff_colors[ix];
762 return "";
763 }
764
765 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
766 {
767 const char *cp;
768 unsigned long allot;
769 size_t l = len;
770
771 if (ecb->truncate)
772 return ecb->truncate(line, len);
773 cp = line;
774 allot = l;
775 while (0 < l) {
776 (void) utf8_width(&cp, &l);
777 if (!cp)
778 break; /* truncated in the middle? */
779 }
780 return allot - l;
781 }
782
783 static void find_lno(const char *line, struct emit_callback *ecbdata)
784 {
785 const char *p;
786 ecbdata->lno_in_preimage = 0;
787 ecbdata->lno_in_postimage = 0;
788 p = strchr(line, '-');
789 if (!p)
790 return; /* cannot happen */
791 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
792 p = strchr(p, '+');
793 if (!p)
794 return; /* cannot happen */
795 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
796 }
797
798 static void fn_out_consume(void *priv, char *line, unsigned long len)
799 {
800 struct emit_callback *ecbdata = priv;
801 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
802 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
803 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
804
805 if (ecbdata->header) {
806 fprintf(ecbdata->file, "%s", ecbdata->header->buf);
807 strbuf_reset(ecbdata->header);
808 ecbdata->header = NULL;
809 }
810 *(ecbdata->found_changesp) = 1;
811
812 if (ecbdata->label_path[0]) {
813 const char *name_a_tab, *name_b_tab;
814
815 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
816 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
817
818 fprintf(ecbdata->file, "%s--- %s%s%s\n",
819 meta, ecbdata->label_path[0], reset, name_a_tab);
820 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
821 meta, ecbdata->label_path[1], reset, name_b_tab);
822 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
823 }
824
825 if (diff_suppress_blank_empty
826 && len == 2 && line[0] == ' ' && line[1] == '\n') {
827 line[0] = '\n';
828 len = 1;
829 }
830
831 if (line[0] == '@') {
832 if (ecbdata->diff_words)
833 diff_words_flush(ecbdata);
834 len = sane_truncate_line(ecbdata, line, len);
835 find_lno(line, ecbdata);
836 emit_hunk_header(ecbdata, line, len);
837 if (line[len-1] != '\n')
838 putc('\n', ecbdata->file);
839 return;
840 }
841
842 if (len < 1) {
843 emit_line(ecbdata->file, reset, reset, line, len);
844 return;
845 }
846
847 if (ecbdata->diff_words) {
848 if (line[0] == '-') {
849 diff_words_append(line, len,
850 &ecbdata->diff_words->minus);
851 return;
852 } else if (line[0] == '+') {
853 diff_words_append(line, len,
854 &ecbdata->diff_words->plus);
855 return;
856 }
857 diff_words_flush(ecbdata);
858 line++;
859 len--;
860 emit_line(ecbdata->file, plain, reset, line, len);
861 return;
862 }
863
864 if (line[0] != '+') {
865 const char *color =
866 diff_get_color(ecbdata->color_diff,
867 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
868 ecbdata->lno_in_preimage++;
869 if (line[0] == ' ')
870 ecbdata->lno_in_postimage++;
871 emit_line(ecbdata->file, color, reset, line, len);
872 } else {
873 ecbdata->lno_in_postimage++;
874 emit_add_line(reset, ecbdata, line + 1, len - 1);
875 }
876 }
877
878 static char *pprint_rename(const char *a, const char *b)
879 {
880 const char *old = a;
881 const char *new = b;
882 struct strbuf name = STRBUF_INIT;
883 int pfx_length, sfx_length;
884 int len_a = strlen(a);
885 int len_b = strlen(b);
886 int a_midlen, b_midlen;
887 int qlen_a = quote_c_style(a, NULL, NULL, 0);
888 int qlen_b = quote_c_style(b, NULL, NULL, 0);
889
890 if (qlen_a || qlen_b) {
891 quote_c_style(a, &name, NULL, 0);
892 strbuf_addstr(&name, " => ");
893 quote_c_style(b, &name, NULL, 0);
894 return strbuf_detach(&name, NULL);
895 }
896
897 /* Find common prefix */
898 pfx_length = 0;
899 while (*old && *new && *old == *new) {
900 if (*old == '/')
901 pfx_length = old - a + 1;
902 old++;
903 new++;
904 }
905
906 /* Find common suffix */
907 old = a + len_a;
908 new = b + len_b;
909 sfx_length = 0;
910 while (a <= old && b <= new && *old == *new) {
911 if (*old == '/')
912 sfx_length = len_a - (old - a);
913 old--;
914 new--;
915 }
916
917 /*
918 * pfx{mid-a => mid-b}sfx
919 * {pfx-a => pfx-b}sfx
920 * pfx{sfx-a => sfx-b}
921 * name-a => name-b
922 */
923 a_midlen = len_a - pfx_length - sfx_length;
924 b_midlen = len_b - pfx_length - sfx_length;
925 if (a_midlen < 0)
926 a_midlen = 0;
927 if (b_midlen < 0)
928 b_midlen = 0;
929
930 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
931 if (pfx_length + sfx_length) {
932 strbuf_add(&name, a, pfx_length);
933 strbuf_addch(&name, '{');
934 }
935 strbuf_add(&name, a + pfx_length, a_midlen);
936 strbuf_addstr(&name, " => ");
937 strbuf_add(&name, b + pfx_length, b_midlen);
938 if (pfx_length + sfx_length) {
939 strbuf_addch(&name, '}');
940 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
941 }
942 return strbuf_detach(&name, NULL);
943 }
944
945 struct diffstat_t {
946 int nr;
947 int alloc;
948 struct diffstat_file {
949 char *from_name;
950 char *name;
951 char *print_name;
952 unsigned is_unmerged:1;
953 unsigned is_binary:1;
954 unsigned is_renamed:1;
955 uintmax_t added, deleted;
956 } **files;
957 };
958
959 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
960 const char *name_a,
961 const char *name_b)
962 {
963 struct diffstat_file *x;
964 x = xcalloc(sizeof (*x), 1);
965 if (diffstat->nr == diffstat->alloc) {
966 diffstat->alloc = alloc_nr(diffstat->alloc);
967 diffstat->files = xrealloc(diffstat->files,
968 diffstat->alloc * sizeof(x));
969 }
970 diffstat->files[diffstat->nr++] = x;
971 if (name_b) {
972 x->from_name = xstrdup(name_a);
973 x->name = xstrdup(name_b);
974 x->is_renamed = 1;
975 }
976 else {
977 x->from_name = NULL;
978 x->name = xstrdup(name_a);
979 }
980 return x;
981 }
982
983 static void diffstat_consume(void *priv, char *line, unsigned long len)
984 {
985 struct diffstat_t *diffstat = priv;
986 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
987
988 if (line[0] == '+')
989 x->added++;
990 else if (line[0] == '-')
991 x->deleted++;
992 }
993
994 const char mime_boundary_leader[] = "------------";
995
996 static int scale_linear(int it, int width, int max_change)
997 {
998 /*
999 * make sure that at least one '-' is printed if there were deletions,
1000 * and likewise for '+'.
1001 */
1002 if (max_change < 2)
1003 return it;
1004 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
1005 }
1006
1007 static void show_name(FILE *file,
1008 const char *prefix, const char *name, int len)
1009 {
1010 fprintf(file, " %s%-*s |", prefix, len, name);
1011 }
1012
1013 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1014 {
1015 if (cnt <= 0)
1016 return;
1017 fprintf(file, "%s", set);
1018 while (cnt--)
1019 putc(ch, file);
1020 fprintf(file, "%s", reset);
1021 }
1022
1023 static void fill_print_name(struct diffstat_file *file)
1024 {
1025 char *pname;
1026
1027 if (file->print_name)
1028 return;
1029
1030 if (!file->is_renamed) {
1031 struct strbuf buf = STRBUF_INIT;
1032 if (quote_c_style(file->name, &buf, NULL, 0)) {
1033 pname = strbuf_detach(&buf, NULL);
1034 } else {
1035 pname = file->name;
1036 strbuf_release(&buf);
1037 }
1038 } else {
1039 pname = pprint_rename(file->from_name, file->name);
1040 }
1041 file->print_name = pname;
1042 }
1043
1044 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1045 {
1046 int i, len, add, del, adds = 0, dels = 0;
1047 uintmax_t max_change = 0, max_len = 0;
1048 int total_files = data->nr;
1049 int width, name_width;
1050 const char *reset, *set, *add_c, *del_c;
1051
1052 if (data->nr == 0)
1053 return;
1054
1055 width = options->stat_width ? options->stat_width : 80;
1056 name_width = options->stat_name_width ? options->stat_name_width : 50;
1057
1058 /* Sanity: give at least 5 columns to the graph,
1059 * but leave at least 10 columns for the name.
1060 */
1061 if (width < 25)
1062 width = 25;
1063 if (name_width < 10)
1064 name_width = 10;
1065 else if (width < name_width + 15)
1066 name_width = width - 15;
1067
1068 /* Find the longest filename and max number of changes */
1069 reset = diff_get_color_opt(options, DIFF_RESET);
1070 set = diff_get_color_opt(options, DIFF_PLAIN);
1071 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1072 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1073
1074 for (i = 0; i < data->nr; i++) {
1075 struct diffstat_file *file = data->files[i];
1076 uintmax_t change = file->added + file->deleted;
1077 fill_print_name(file);
1078 len = strlen(file->print_name);
1079 if (max_len < len)
1080 max_len = len;
1081
1082 if (file->is_binary || file->is_unmerged)
1083 continue;
1084 if (max_change < change)
1085 max_change = change;
1086 }
1087
1088 /* Compute the width of the graph part;
1089 * 10 is for one blank at the beginning of the line plus
1090 * " | count " between the name and the graph.
1091 *
1092 * From here on, name_width is the width of the name area,
1093 * and width is the width of the graph area.
1094 */
1095 name_width = (name_width < max_len) ? name_width : max_len;
1096 if (width < (name_width + 10) + max_change)
1097 width = width - (name_width + 10);
1098 else
1099 width = max_change;
1100
1101 for (i = 0; i < data->nr; i++) {
1102 const char *prefix = "";
1103 char *name = data->files[i]->print_name;
1104 uintmax_t added = data->files[i]->added;
1105 uintmax_t deleted = data->files[i]->deleted;
1106 int name_len;
1107
1108 /*
1109 * "scale" the filename
1110 */
1111 len = name_width;
1112 name_len = strlen(name);
1113 if (name_width < name_len) {
1114 char *slash;
1115 prefix = "...";
1116 len -= 3;
1117 name += name_len - len;
1118 slash = strchr(name, '/');
1119 if (slash)
1120 name = slash;
1121 }
1122
1123 if (data->files[i]->is_binary) {
1124 show_name(options->file, prefix, name, len);
1125 fprintf(options->file, " Bin ");
1126 fprintf(options->file, "%s%"PRIuMAX"%s",
1127 del_c, deleted, reset);
1128 fprintf(options->file, " -> ");
1129 fprintf(options->file, "%s%"PRIuMAX"%s",
1130 add_c, added, reset);
1131 fprintf(options->file, " bytes");
1132 fprintf(options->file, "\n");
1133 continue;
1134 }
1135 else if (data->files[i]->is_unmerged) {
1136 show_name(options->file, prefix, name, len);
1137 fprintf(options->file, " Unmerged\n");
1138 continue;
1139 }
1140 else if (!data->files[i]->is_renamed &&
1141 (added + deleted == 0)) {
1142 total_files--;
1143 continue;
1144 }
1145
1146 /*
1147 * scale the add/delete
1148 */
1149 add = added;
1150 del = deleted;
1151 adds += add;
1152 dels += del;
1153
1154 if (width <= max_change) {
1155 add = scale_linear(add, width, max_change);
1156 del = scale_linear(del, width, max_change);
1157 }
1158 show_name(options->file, prefix, name, len);
1159 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1160 added + deleted ? " " : "");
1161 show_graph(options->file, '+', add, add_c, reset);
1162 show_graph(options->file, '-', del, del_c, reset);
1163 fprintf(options->file, "\n");
1164 }
1165 fprintf(options->file,
1166 " %d files changed, %d insertions(+), %d deletions(-)\n",
1167 total_files, adds, dels);
1168 }
1169
1170 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1171 {
1172 int i, adds = 0, dels = 0, total_files = data->nr;
1173
1174 if (data->nr == 0)
1175 return;
1176
1177 for (i = 0; i < data->nr; i++) {
1178 if (!data->files[i]->is_binary &&
1179 !data->files[i]->is_unmerged) {
1180 int added = data->files[i]->added;
1181 int deleted= data->files[i]->deleted;
1182 if (!data->files[i]->is_renamed &&
1183 (added + deleted == 0)) {
1184 total_files--;
1185 } else {
1186 adds += added;
1187 dels += deleted;
1188 }
1189 }
1190 }
1191 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1192 total_files, adds, dels);
1193 }
1194
1195 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1196 {
1197 int i;
1198
1199 if (data->nr == 0)
1200 return;
1201
1202 for (i = 0; i < data->nr; i++) {
1203 struct diffstat_file *file = data->files[i];
1204
1205 if (file->is_binary)
1206 fprintf(options->file, "-\t-\t");
1207 else
1208 fprintf(options->file,
1209 "%"PRIuMAX"\t%"PRIuMAX"\t",
1210 file->added, file->deleted);
1211 if (options->line_termination) {
1212 fill_print_name(file);
1213 if (!file->is_renamed)
1214 write_name_quoted(file->name, options->file,
1215 options->line_termination);
1216 else {
1217 fputs(file->print_name, options->file);
1218 putc(options->line_termination, options->file);
1219 }
1220 } else {
1221 if (file->is_renamed) {
1222 putc('\0', options->file);
1223 write_name_quoted(file->from_name, options->file, '\0');
1224 }
1225 write_name_quoted(file->name, options->file, '\0');
1226 }
1227 }
1228 }
1229
1230 struct dirstat_file {
1231 const char *name;
1232 unsigned long changed;
1233 };
1234
1235 struct dirstat_dir {
1236 struct dirstat_file *files;
1237 int alloc, nr, percent, cumulative;
1238 };
1239
1240 static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
1241 {
1242 unsigned long this_dir = 0;
1243 unsigned int sources = 0;
1244
1245 while (dir->nr) {
1246 struct dirstat_file *f = dir->files;
1247 int namelen = strlen(f->name);
1248 unsigned long this;
1249 char *slash;
1250
1251 if (namelen < baselen)
1252 break;
1253 if (memcmp(f->name, base, baselen))
1254 break;
1255 slash = strchr(f->name + baselen, '/');
1256 if (slash) {
1257 int newbaselen = slash + 1 - f->name;
1258 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
1259 sources++;
1260 } else {
1261 this = f->changed;
1262 dir->files++;
1263 dir->nr--;
1264 sources += 2;
1265 }
1266 this_dir += this;
1267 }
1268
1269 /*
1270 * We don't report dirstat's for
1271 * - the top level
1272 * - or cases where everything came from a single directory
1273 * under this directory (sources == 1).
1274 */
1275 if (baselen && sources != 1) {
1276 int permille = this_dir * 1000 / changed;
1277 if (permille) {
1278 int percent = permille / 10;
1279 if (percent >= dir->percent) {
1280 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1281 if (!dir->cumulative)
1282 return 0;
1283 }
1284 }
1285 }
1286 return this_dir;
1287 }
1288
1289 static int dirstat_compare(const void *_a, const void *_b)
1290 {
1291 const struct dirstat_file *a = _a;
1292 const struct dirstat_file *b = _b;
1293 return strcmp(a->name, b->name);
1294 }
1295
1296 static void show_dirstat(struct diff_options *options)
1297 {
1298 int i;
1299 unsigned long changed;
1300 struct dirstat_dir dir;
1301 struct diff_queue_struct *q = &diff_queued_diff;
1302
1303 dir.files = NULL;
1304 dir.alloc = 0;
1305 dir.nr = 0;
1306 dir.percent = options->dirstat_percent;
1307 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1308
1309 changed = 0;
1310 for (i = 0; i < q->nr; i++) {
1311 struct diff_filepair *p = q->queue[i];
1312 const char *name;
1313 unsigned long copied, added, damage;
1314
1315 name = p->one->path ? p->one->path : p->two->path;
1316
1317 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1318 diff_populate_filespec(p->one, 0);
1319 diff_populate_filespec(p->two, 0);
1320 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1321 &copied, &added);
1322 diff_free_filespec_data(p->one);
1323 diff_free_filespec_data(p->two);
1324 } else if (DIFF_FILE_VALID(p->one)) {
1325 diff_populate_filespec(p->one, 1);
1326 copied = added = 0;
1327 diff_free_filespec_data(p->one);
1328 } else if (DIFF_FILE_VALID(p->two)) {
1329 diff_populate_filespec(p->two, 1);
1330 copied = 0;
1331 added = p->two->size;
1332 diff_free_filespec_data(p->two);
1333 } else
1334 continue;
1335
1336 /*
1337 * Original minus copied is the removed material,
1338 * added is the new material. They are both damages
1339 * made to the preimage. In --dirstat-by-file mode, count
1340 * damaged files, not damaged lines. This is done by
1341 * counting only a single damaged line per file.
1342 */
1343 damage = (p->one->size - copied) + added;
1344 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1345 damage = 1;
1346
1347 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1348 dir.files[dir.nr].name = name;
1349 dir.files[dir.nr].changed = damage;
1350 changed += damage;
1351 dir.nr++;
1352 }
1353
1354 /* This can happen even with many files, if everything was renames */
1355 if (!changed)
1356 return;
1357
1358 /* Show all directories with more than x% of the changes */
1359 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1360 gather_dirstat(options->file, &dir, changed, "", 0);
1361 }
1362
1363 static void free_diffstat_info(struct diffstat_t *diffstat)
1364 {
1365 int i;
1366 for (i = 0; i < diffstat->nr; i++) {
1367 struct diffstat_file *f = diffstat->files[i];
1368 if (f->name != f->print_name)
1369 free(f->print_name);
1370 free(f->name);
1371 free(f->from_name);
1372 free(f);
1373 }
1374 free(diffstat->files);
1375 }
1376
1377 struct checkdiff_t {
1378 const char *filename;
1379 int lineno;
1380 int conflict_marker_size;
1381 struct diff_options *o;
1382 unsigned ws_rule;
1383 unsigned status;
1384 };
1385
1386 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1387 {
1388 char firstchar;
1389 int cnt;
1390
1391 if (len < marker_size + 1)
1392 return 0;
1393 firstchar = line[0];
1394 switch (firstchar) {
1395 case '=': case '>': case '<': case '|':
1396 break;
1397 default:
1398 return 0;
1399 }
1400 for (cnt = 1; cnt < marker_size; cnt++)
1401 if (line[cnt] != firstchar)
1402 return 0;
1403 /* line[1] thru line[marker_size-1] are same as firstchar */
1404 if (len < marker_size + 1 || !isspace(line[marker_size]))
1405 return 0;
1406 return 1;
1407 }
1408
1409 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1410 {
1411 struct checkdiff_t *data = priv;
1412 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1413 int marker_size = data->conflict_marker_size;
1414 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1415 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1416 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1417 char *err;
1418
1419 if (line[0] == '+') {
1420 unsigned bad;
1421 data->lineno++;
1422 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1423 data->status |= 1;
1424 fprintf(data->o->file,
1425 "%s:%d: leftover conflict marker\n",
1426 data->filename, data->lineno);
1427 }
1428 bad = ws_check(line + 1, len - 1, data->ws_rule);
1429 if (!bad)
1430 return;
1431 data->status |= bad;
1432 err = whitespace_error_string(bad);
1433 fprintf(data->o->file, "%s:%d: %s.\n",
1434 data->filename, data->lineno, err);
1435 free(err);
1436 emit_line(data->o->file, set, reset, line, 1);
1437 ws_check_emit(line + 1, len - 1, data->ws_rule,
1438 data->o->file, set, reset, ws);
1439 } else if (line[0] == ' ') {
1440 data->lineno++;
1441 } else if (line[0] == '@') {
1442 char *plus = strchr(line, '+');
1443 if (plus)
1444 data->lineno = strtol(plus, NULL, 10) - 1;
1445 else
1446 die("invalid diff");
1447 }
1448 }
1449
1450 static unsigned char *deflate_it(char *data,
1451 unsigned long size,
1452 unsigned long *result_size)
1453 {
1454 int bound;
1455 unsigned char *deflated;
1456 z_stream stream;
1457
1458 memset(&stream, 0, sizeof(stream));
1459 deflateInit(&stream, zlib_compression_level);
1460 bound = deflateBound(&stream, size);
1461 deflated = xmalloc(bound);
1462 stream.next_out = deflated;
1463 stream.avail_out = bound;
1464
1465 stream.next_in = (unsigned char *)data;
1466 stream.avail_in = size;
1467 while (deflate(&stream, Z_FINISH) == Z_OK)
1468 ; /* nothing */
1469 deflateEnd(&stream);
1470 *result_size = stream.total_out;
1471 return deflated;
1472 }
1473
1474 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
1475 {
1476 void *cp;
1477 void *delta;
1478 void *deflated;
1479 void *data;
1480 unsigned long orig_size;
1481 unsigned long delta_size;
1482 unsigned long deflate_size;
1483 unsigned long data_size;
1484
1485 /* We could do deflated delta, or we could do just deflated two,
1486 * whichever is smaller.
1487 */
1488 delta = NULL;
1489 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1490 if (one->size && two->size) {
1491 delta = diff_delta(one->ptr, one->size,
1492 two->ptr, two->size,
1493 &delta_size, deflate_size);
1494 if (delta) {
1495 void *to_free = delta;
1496 orig_size = delta_size;
1497 delta = deflate_it(delta, delta_size, &delta_size);
1498 free(to_free);
1499 }
1500 }
1501
1502 if (delta && delta_size < deflate_size) {
1503 fprintf(file, "delta %lu\n", orig_size);
1504 free(deflated);
1505 data = delta;
1506 data_size = delta_size;
1507 }
1508 else {
1509 fprintf(file, "literal %lu\n", two->size);
1510 free(delta);
1511 data = deflated;
1512 data_size = deflate_size;
1513 }
1514
1515 /* emit data encoded in base85 */
1516 cp = data;
1517 while (data_size) {
1518 int bytes = (52 < data_size) ? 52 : data_size;
1519 char line[70];
1520 data_size -= bytes;
1521 if (bytes <= 26)
1522 line[0] = bytes + 'A' - 1;
1523 else
1524 line[0] = bytes - 26 + 'a' - 1;
1525 encode_85(line + 1, cp, bytes);
1526 cp = (char *) cp + bytes;
1527 fputs(line, file);
1528 fputc('\n', file);
1529 }
1530 fprintf(file, "\n");
1531 free(data);
1532 }
1533
1534 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
1535 {
1536 fprintf(file, "GIT binary patch\n");
1537 emit_binary_diff_body(file, one, two);
1538 emit_binary_diff_body(file, two, one);
1539 }
1540
1541 static void diff_filespec_load_driver(struct diff_filespec *one)
1542 {
1543 if (!one->driver)
1544 one->driver = userdiff_find_by_path(one->path);
1545 if (!one->driver)
1546 one->driver = userdiff_find_by_name("default");
1547 }
1548
1549 int diff_filespec_is_binary(struct diff_filespec *one)
1550 {
1551 if (one->is_binary == -1) {
1552 diff_filespec_load_driver(one);
1553 if (one->driver->binary != -1)
1554 one->is_binary = one->driver->binary;
1555 else {
1556 if (!one->data && DIFF_FILE_VALID(one))
1557 diff_populate_filespec(one, 0);
1558 if (one->data)
1559 one->is_binary = buffer_is_binary(one->data,
1560 one->size);
1561 if (one->is_binary == -1)
1562 one->is_binary = 0;
1563 }
1564 }
1565 return one->is_binary;
1566 }
1567
1568 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1569 {
1570 diff_filespec_load_driver(one);
1571 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1572 }
1573
1574 static const char *userdiff_word_regex(struct diff_filespec *one)
1575 {
1576 diff_filespec_load_driver(one);
1577 return one->driver->word_regex;
1578 }
1579
1580 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1581 {
1582 if (!options->a_prefix)
1583 options->a_prefix = a;
1584 if (!options->b_prefix)
1585 options->b_prefix = b;
1586 }
1587
1588 static const char *get_textconv(struct diff_filespec *one)
1589 {
1590 if (!DIFF_FILE_VALID(one))
1591 return NULL;
1592 if (!S_ISREG(one->mode))
1593 return NULL;
1594 diff_filespec_load_driver(one);
1595 return one->driver->textconv;
1596 }
1597
1598 static void builtin_diff(const char *name_a,
1599 const char *name_b,
1600 struct diff_filespec *one,
1601 struct diff_filespec *two,
1602 const char *xfrm_msg,
1603 int must_show_header,
1604 struct diff_options *o,
1605 int complete_rewrite)
1606 {
1607 mmfile_t mf1, mf2;
1608 const char *lbl[2];
1609 char *a_one, *b_two;
1610 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1611 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1612 const char *a_prefix, *b_prefix;
1613 const char *textconv_one = NULL, *textconv_two = NULL;
1614 struct strbuf header = STRBUF_INIT;
1615
1616 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
1617 (!one->mode || S_ISGITLINK(one->mode)) &&
1618 (!two->mode || S_ISGITLINK(two->mode))) {
1619 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
1620 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
1621 show_submodule_summary(o->file, one ? one->path : two->path,
1622 one->sha1, two->sha1, two->dirty_submodule,
1623 del, add, reset);
1624 return;
1625 }
1626
1627 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1628 textconv_one = get_textconv(one);
1629 textconv_two = get_textconv(two);
1630 }
1631
1632 diff_set_mnemonic_prefix(o, "a/", "b/");
1633 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1634 a_prefix = o->b_prefix;
1635 b_prefix = o->a_prefix;
1636 } else {
1637 a_prefix = o->a_prefix;
1638 b_prefix = o->b_prefix;
1639 }
1640
1641 /* Never use a non-valid filename anywhere if at all possible */
1642 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1643 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1644
1645 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1646 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1647 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1648 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1649 strbuf_addf(&header, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1650 if (lbl[0][0] == '/') {
1651 /* /dev/null */
1652 strbuf_addf(&header, "%snew file mode %06o%s\n", set, two->mode, reset);
1653 if (xfrm_msg)
1654 strbuf_addstr(&header, xfrm_msg);
1655 must_show_header = 1;
1656 }
1657 else if (lbl[1][0] == '/') {
1658 strbuf_addf(&header, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1659 if (xfrm_msg)
1660 strbuf_addstr(&header, xfrm_msg);
1661 must_show_header = 1;
1662 }
1663 else {
1664 if (one->mode != two->mode) {
1665 strbuf_addf(&header, "%sold mode %06o%s\n", set, one->mode, reset);
1666 strbuf_addf(&header, "%snew mode %06o%s\n", set, two->mode, reset);
1667 must_show_header = 1;
1668 }
1669 if (xfrm_msg)
1670 strbuf_addstr(&header, xfrm_msg);
1671
1672 /*
1673 * we do not run diff between different kind
1674 * of objects.
1675 */
1676 if ((one->mode ^ two->mode) & S_IFMT)
1677 goto free_ab_and_return;
1678 if (complete_rewrite &&
1679 (textconv_one || !diff_filespec_is_binary(one)) &&
1680 (textconv_two || !diff_filespec_is_binary(two))) {
1681 fprintf(o->file, "%s", header.buf);
1682 strbuf_reset(&header);
1683 emit_rewrite_diff(name_a, name_b, one, two,
1684 textconv_one, textconv_two, o);
1685 o->found_changes = 1;
1686 goto free_ab_and_return;
1687 }
1688 }
1689
1690 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1691 die("unable to read files to diff");
1692
1693 if (!DIFF_OPT_TST(o, TEXT) &&
1694 ( (diff_filespec_is_binary(one) && !textconv_one) ||
1695 (diff_filespec_is_binary(two) && !textconv_two) )) {
1696 /* Quite common confusing case */
1697 if (mf1.size == mf2.size &&
1698 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
1699 if (must_show_header)
1700 fprintf(o->file, "%s", header.buf);
1701 goto free_ab_and_return;
1702 }
1703 fprintf(o->file, "%s", header.buf);
1704 strbuf_reset(&header);
1705 if (DIFF_OPT_TST(o, BINARY))
1706 emit_binary_diff(o->file, &mf1, &mf2);
1707 else
1708 fprintf(o->file, "Binary files %s and %s differ\n",
1709 lbl[0], lbl[1]);
1710 o->found_changes = 1;
1711 }
1712 else {
1713 /* Crazy xdl interfaces.. */
1714 const char *diffopts = getenv("GIT_DIFF_OPTS");
1715 xpparam_t xpp;
1716 xdemitconf_t xecfg;
1717 struct emit_callback ecbdata;
1718 const struct userdiff_funcname *pe;
1719
1720 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
1721 fprintf(o->file, "%s", header.buf);
1722 strbuf_reset(&header);
1723 }
1724
1725 if (textconv_one) {
1726 size_t size;
1727 mf1.ptr = run_textconv(textconv_one, one, &size);
1728 if (!mf1.ptr)
1729 die("unable to read files to diff");
1730 mf1.size = size;
1731 }
1732 if (textconv_two) {
1733 size_t size;
1734 mf2.ptr = run_textconv(textconv_two, two, &size);
1735 if (!mf2.ptr)
1736 die("unable to read files to diff");
1737 mf2.size = size;
1738 }
1739
1740 pe = diff_funcname_pattern(one);
1741 if (!pe)
1742 pe = diff_funcname_pattern(two);
1743
1744 memset(&xpp, 0, sizeof(xpp));
1745 memset(&xecfg, 0, sizeof(xecfg));
1746 memset(&ecbdata, 0, sizeof(ecbdata));
1747 ecbdata.label_path = lbl;
1748 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1749 ecbdata.found_changesp = &o->found_changes;
1750 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1751 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
1752 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1753 ecbdata.file = o->file;
1754 ecbdata.header = header.len ? &header : NULL;
1755 xpp.flags = o->xdl_opts;
1756 xecfg.ctxlen = o->context;
1757 xecfg.interhunkctxlen = o->interhunkcontext;
1758 xecfg.flags = XDL_EMIT_FUNCNAMES;
1759 if (pe)
1760 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1761 if (!diffopts)
1762 ;
1763 else if (!prefixcmp(diffopts, "--unified="))
1764 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1765 else if (!prefixcmp(diffopts, "-u"))
1766 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1767 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1768 ecbdata.diff_words =
1769 xcalloc(1, sizeof(struct diff_words_data));
1770 ecbdata.diff_words->file = o->file;
1771 if (!o->word_regex)
1772 o->word_regex = userdiff_word_regex(one);
1773 if (!o->word_regex)
1774 o->word_regex = userdiff_word_regex(two);
1775 if (!o->word_regex)
1776 o->word_regex = diff_word_regex_cfg;
1777 if (o->word_regex) {
1778 ecbdata.diff_words->word_regex = (regex_t *)
1779 xmalloc(sizeof(regex_t));
1780 if (regcomp(ecbdata.diff_words->word_regex,
1781 o->word_regex,
1782 REG_EXTENDED | REG_NEWLINE))
1783 die ("Invalid regular expression: %s",
1784 o->word_regex);
1785 }
1786 }
1787 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
1788 &xpp, &xecfg);
1789 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1790 free_diff_words_data(&ecbdata);
1791 if (textconv_one)
1792 free(mf1.ptr);
1793 if (textconv_two)
1794 free(mf2.ptr);
1795 xdiff_clear_find_func(&xecfg);
1796 }
1797
1798 free_ab_and_return:
1799 strbuf_release(&header);
1800 diff_free_filespec_data(one);
1801 diff_free_filespec_data(two);
1802 free(a_one);
1803 free(b_two);
1804 return;
1805 }
1806
1807 static void builtin_diffstat(const char *name_a, const char *name_b,
1808 struct diff_filespec *one,
1809 struct diff_filespec *two,
1810 struct diffstat_t *diffstat,
1811 struct diff_options *o,
1812 int complete_rewrite)
1813 {
1814 mmfile_t mf1, mf2;
1815 struct diffstat_file *data;
1816
1817 data = diffstat_add(diffstat, name_a, name_b);
1818
1819 if (!one || !two) {
1820 data->is_unmerged = 1;
1821 return;
1822 }
1823 if (complete_rewrite) {
1824 diff_populate_filespec(one, 0);
1825 diff_populate_filespec(two, 0);
1826 data->deleted = count_lines(one->data, one->size);
1827 data->added = count_lines(two->data, two->size);
1828 goto free_and_return;
1829 }
1830 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1831 die("unable to read files to diff");
1832
1833 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1834 data->is_binary = 1;
1835 data->added = mf2.size;
1836 data->deleted = mf1.size;
1837 } else {
1838 /* Crazy xdl interfaces.. */
1839 xpparam_t xpp;
1840 xdemitconf_t xecfg;
1841
1842 memset(&xpp, 0, sizeof(xpp));
1843 memset(&xecfg, 0, sizeof(xecfg));
1844 xpp.flags = o->xdl_opts;
1845 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
1846 &xpp, &xecfg);
1847 }
1848
1849 free_and_return:
1850 diff_free_filespec_data(one);
1851 diff_free_filespec_data(two);
1852 }
1853
1854 static void builtin_checkdiff(const char *name_a, const char *name_b,
1855 const char *attr_path,
1856 struct diff_filespec *one,
1857 struct diff_filespec *two,
1858 struct diff_options *o)
1859 {
1860 mmfile_t mf1, mf2;
1861 struct checkdiff_t data;
1862
1863 if (!two)
1864 return;
1865
1866 memset(&data, 0, sizeof(data));
1867 data.filename = name_b ? name_b : name_a;
1868 data.lineno = 0;
1869 data.o = o;
1870 data.ws_rule = whitespace_rule(attr_path);
1871 data.conflict_marker_size = ll_merge_marker_size(attr_path);
1872
1873 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1874 die("unable to read files to diff");
1875
1876 /*
1877 * All the other codepaths check both sides, but not checking
1878 * the "old" side here is deliberate. We are checking the newly
1879 * introduced changes, and as long as the "new" side is text, we
1880 * can and should check what it introduces.
1881 */
1882 if (diff_filespec_is_binary(two))
1883 goto free_and_return;
1884 else {
1885 /* Crazy xdl interfaces.. */
1886 xpparam_t xpp;
1887 xdemitconf_t xecfg;
1888
1889 memset(&xpp, 0, sizeof(xpp));
1890 memset(&xecfg, 0, sizeof(xecfg));
1891 xecfg.ctxlen = 1; /* at least one context line */
1892 xpp.flags = 0;
1893 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
1894 &xpp, &xecfg);
1895
1896 if (data.ws_rule & WS_BLANK_AT_EOF) {
1897 struct emit_callback ecbdata;
1898 int blank_at_eof;
1899
1900 ecbdata.ws_rule = data.ws_rule;
1901 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1902 blank_at_eof = ecbdata.blank_at_eof_in_preimage;
1903
1904 if (blank_at_eof) {
1905 static char *err;
1906 if (!err)
1907 err = whitespace_error_string(WS_BLANK_AT_EOF);
1908 fprintf(o->file, "%s:%d: %s.\n",
1909 data.filename, blank_at_eof, err);
1910 data.status = 1; /* report errors */
1911 }
1912 }
1913 }
1914 free_and_return:
1915 diff_free_filespec_data(one);
1916 diff_free_filespec_data(two);
1917 if (data.status)
1918 DIFF_OPT_SET(o, CHECK_FAILED);
1919 }
1920
1921 struct diff_filespec *alloc_filespec(const char *path)
1922 {
1923 int namelen = strlen(path);
1924 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1925
1926 memset(spec, 0, sizeof(*spec));
1927 spec->path = (char *)(spec + 1);
1928 memcpy(spec->path, path, namelen+1);
1929 spec->count = 1;
1930 spec->is_binary = -1;
1931 return spec;
1932 }
1933
1934 void free_filespec(struct diff_filespec *spec)
1935 {
1936 if (!--spec->count) {
1937 diff_free_filespec_data(spec);
1938 free(spec);
1939 }
1940 }
1941
1942 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1943 unsigned short mode)
1944 {
1945 if (mode) {
1946 spec->mode = canon_mode(mode);
1947 hashcpy(spec->sha1, sha1);
1948 spec->sha1_valid = !is_null_sha1(sha1);
1949 }
1950 }
1951
1952 /*
1953 * Given a name and sha1 pair, if the index tells us the file in
1954 * the work tree has that object contents, return true, so that
1955 * prepare_temp_file() does not have to inflate and extract.
1956 */
1957 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1958 {
1959 struct cache_entry *ce;
1960 struct stat st;
1961 int pos, len;
1962
1963 /*
1964 * We do not read the cache ourselves here, because the
1965 * benchmark with my previous version that always reads cache
1966 * shows that it makes things worse for diff-tree comparing
1967 * two linux-2.6 kernel trees in an already checked out work
1968 * tree. This is because most diff-tree comparisons deal with
1969 * only a small number of files, while reading the cache is
1970 * expensive for a large project, and its cost outweighs the
1971 * savings we get by not inflating the object to a temporary
1972 * file. Practically, this code only helps when we are used
1973 * by diff-cache --cached, which does read the cache before
1974 * calling us.
1975 */
1976 if (!active_cache)
1977 return 0;
1978
1979 /* We want to avoid the working directory if our caller
1980 * doesn't need the data in a normal file, this system
1981 * is rather slow with its stat/open/mmap/close syscalls,
1982 * and the object is contained in a pack file. The pack
1983 * is probably already open and will be faster to obtain
1984 * the data through than the working directory. Loose
1985 * objects however would tend to be slower as they need
1986 * to be individually opened and inflated.
1987 */
1988 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
1989 return 0;
1990
1991 len = strlen(name);
1992 pos = cache_name_pos(name, len);
1993 if (pos < 0)
1994 return 0;
1995 ce = active_cache[pos];
1996
1997 /*
1998 * This is not the sha1 we are looking for, or
1999 * unreusable because it is not a regular file.
2000 */
2001 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2002 return 0;
2003
2004 /*
2005 * If ce is marked as "assume unchanged", there is no
2006 * guarantee that work tree matches what we are looking for.
2007 */
2008 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2009 return 0;
2010
2011 /*
2012 * If ce matches the file in the work tree, we can reuse it.
2013 */
2014 if (ce_uptodate(ce) ||
2015 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2016 return 1;
2017
2018 return 0;
2019 }
2020
2021 static int populate_from_stdin(struct diff_filespec *s)
2022 {
2023 struct strbuf buf = STRBUF_INIT;
2024 size_t size = 0;
2025
2026 if (strbuf_read(&buf, 0, 0) < 0)
2027 return error("error while reading from stdin %s",
2028 strerror(errno));
2029
2030 s->should_munmap = 0;
2031 s->data = strbuf_detach(&buf, &size);
2032 s->size = size;
2033 s->should_free = 1;
2034 return 0;
2035 }
2036
2037 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2038 {
2039 int len;
2040 char *data = xmalloc(100), *dirty = "";
2041
2042 /* Are we looking at the work tree? */
2043 if (s->dirty_submodule)
2044 dirty = "-dirty";
2045
2046 len = snprintf(data, 100,
2047 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2048 s->data = data;
2049 s->size = len;
2050 s->should_free = 1;
2051 if (size_only) {
2052 s->data = NULL;
2053 free(data);
2054 }
2055 return 0;
2056 }
2057
2058 /*
2059 * While doing rename detection and pickaxe operation, we may need to
2060 * grab the data for the blob (or file) for our own in-core comparison.
2061 * diff_filespec has data and size fields for this purpose.
2062 */
2063 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2064 {
2065 int err = 0;
2066 if (!DIFF_FILE_VALID(s))
2067 die("internal error: asking to populate invalid file.");
2068 if (S_ISDIR(s->mode))
2069 return -1;
2070
2071 if (s->data)
2072 return 0;
2073
2074 if (size_only && 0 < s->size)
2075 return 0;
2076
2077 if (S_ISGITLINK(s->mode))
2078 return diff_populate_gitlink(s, size_only);
2079
2080 if (!s->sha1_valid ||
2081 reuse_worktree_file(s->path, s->sha1, 0)) {
2082 struct strbuf buf = STRBUF_INIT;
2083 struct stat st;
2084 int fd;
2085
2086 if (!strcmp(s->path, "-"))
2087 return populate_from_stdin(s);
2088
2089 if (lstat(s->path, &st) < 0) {
2090 if (errno == ENOENT) {
2091 err_empty:
2092 err = -1;
2093 empty:
2094 s->data = (char *)"";
2095 s->size = 0;
2096 return err;
2097 }
2098 }
2099 s->size = xsize_t(st.st_size);
2100 if (!s->size)
2101 goto empty;
2102 if (S_ISLNK(st.st_mode)) {
2103 struct strbuf sb = STRBUF_INIT;
2104
2105 if (strbuf_readlink(&sb, s->path, s->size))
2106 goto err_empty;
2107 s->size = sb.len;
2108 s->data = strbuf_detach(&sb, NULL);
2109 s->should_free = 1;
2110 return 0;
2111 }
2112 if (size_only)
2113 return 0;
2114 fd = open(s->path, O_RDONLY);
2115 if (fd < 0)
2116 goto err_empty;
2117 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2118 close(fd);
2119 s->should_munmap = 1;
2120
2121 /*
2122 * Convert from working tree format to canonical git format
2123 */
2124 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2125 size_t size = 0;
2126 munmap(s->data, s->size);
2127 s->should_munmap = 0;
2128 s->data = strbuf_detach(&buf, &size);
2129 s->size = size;
2130 s->should_free = 1;
2131 }
2132 }
2133 else {
2134 enum object_type type;
2135 if (size_only)
2136 type = sha1_object_info(s->sha1, &s->size);
2137 else {
2138 s->data = read_sha1_file(s->sha1, &type, &s->size);
2139 s->should_free = 1;
2140 }
2141 }
2142 return 0;
2143 }
2144
2145 void diff_free_filespec_blob(struct diff_filespec *s)
2146 {
2147 if (s->should_free)
2148 free(s->data);
2149 else if (s->should_munmap)
2150 munmap(s->data, s->size);
2151
2152 if (s->should_free || s->should_munmap) {
2153 s->should_free = s->should_munmap = 0;
2154 s->data = NULL;
2155 }
2156 }
2157
2158 void diff_free_filespec_data(struct diff_filespec *s)
2159 {
2160 diff_free_filespec_blob(s);
2161 free(s->cnt_data);
2162 s->cnt_data = NULL;
2163 }
2164
2165 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2166 void *blob,
2167 unsigned long size,
2168 const unsigned char *sha1,
2169 int mode)
2170 {
2171 int fd;
2172 struct strbuf buf = STRBUF_INIT;
2173 struct strbuf template = STRBUF_INIT;
2174 char *path_dup = xstrdup(path);
2175 const char *base = basename(path_dup);
2176
2177 /* Generate "XXXXXX_basename.ext" */
2178 strbuf_addstr(&template, "XXXXXX_");
2179 strbuf_addstr(&template, base);
2180
2181 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2182 strlen(base) + 1);
2183 if (fd < 0)
2184 die_errno("unable to create temp-file");
2185 if (convert_to_working_tree(path,
2186 (const char *)blob, (size_t)size, &buf)) {
2187 blob = buf.buf;
2188 size = buf.len;
2189 }
2190 if (write_in_full(fd, blob, size) != size)
2191 die_errno("unable to write temp-file");
2192 close(fd);
2193 temp->name = temp->tmp_path;
2194 strcpy(temp->hex, sha1_to_hex(sha1));
2195 temp->hex[40] = 0;
2196 sprintf(temp->mode, "%06o", mode);
2197 strbuf_release(&buf);
2198 strbuf_release(&template);
2199 free(path_dup);
2200 }
2201
2202 static struct diff_tempfile *prepare_temp_file(const char *name,
2203 struct diff_filespec *one)
2204 {
2205 struct diff_tempfile *temp = claim_diff_tempfile();
2206
2207 if (!DIFF_FILE_VALID(one)) {
2208 not_a_valid_file:
2209 /* A '-' entry produces this for file-2, and
2210 * a '+' entry produces this for file-1.
2211 */
2212 temp->name = "/dev/null";
2213 strcpy(temp->hex, ".");
2214 strcpy(temp->mode, ".");
2215 return temp;
2216 }
2217
2218 if (!remove_tempfile_installed) {
2219 atexit(remove_tempfile);
2220 sigchain_push_common(remove_tempfile_on_signal);
2221 remove_tempfile_installed = 1;
2222 }
2223
2224 if (!one->sha1_valid ||
2225 reuse_worktree_file(name, one->sha1, 1)) {
2226 struct stat st;
2227 if (lstat(name, &st) < 0) {
2228 if (errno == ENOENT)
2229 goto not_a_valid_file;
2230 die_errno("stat(%s)", name);
2231 }
2232 if (S_ISLNK(st.st_mode)) {
2233 struct strbuf sb = STRBUF_INIT;
2234 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2235 die_errno("readlink(%s)", name);
2236 prep_temp_blob(name, temp, sb.buf, sb.len,
2237 (one->sha1_valid ?
2238 one->sha1 : null_sha1),
2239 (one->sha1_valid ?
2240 one->mode : S_IFLNK));
2241 strbuf_release(&sb);
2242 }
2243 else {
2244 /* we can borrow from the file in the work tree */
2245 temp->name = name;
2246 if (!one->sha1_valid)
2247 strcpy(temp->hex, sha1_to_hex(null_sha1));
2248 else
2249 strcpy(temp->hex, sha1_to_hex(one->sha1));
2250 /* Even though we may sometimes borrow the
2251 * contents from the work tree, we always want
2252 * one->mode. mode is trustworthy even when
2253 * !(one->sha1_valid), as long as
2254 * DIFF_FILE_VALID(one).
2255 */
2256 sprintf(temp->mode, "%06o", one->mode);
2257 }
2258 return temp;
2259 }
2260 else {
2261 if (diff_populate_filespec(one, 0))
2262 die("cannot read data blob for %s", one->path);
2263 prep_temp_blob(name, temp, one->data, one->size,
2264 one->sha1, one->mode);
2265 }
2266 return temp;
2267 }
2268
2269 /* An external diff command takes:
2270 *
2271 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2272 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2273 *
2274 */
2275 static void run_external_diff(const char *pgm,
2276 const char *name,
2277 const char *other,
2278 struct diff_filespec *one,
2279 struct diff_filespec *two,
2280 const char *xfrm_msg,
2281 int complete_rewrite)
2282 {
2283 const char *spawn_arg[10];
2284 int retval;
2285 const char **arg = &spawn_arg[0];
2286
2287 if (one && two) {
2288 struct diff_tempfile *temp_one, *temp_two;
2289 const char *othername = (other ? other : name);
2290 temp_one = prepare_temp_file(name, one);
2291 temp_two = prepare_temp_file(othername, two);
2292 *arg++ = pgm;
2293 *arg++ = name;
2294 *arg++ = temp_one->name;
2295 *arg++ = temp_one->hex;
2296 *arg++ = temp_one->mode;
2297 *arg++ = temp_two->name;
2298 *arg++ = temp_two->hex;
2299 *arg++ = temp_two->mode;
2300 if (other) {
2301 *arg++ = other;
2302 *arg++ = xfrm_msg;
2303 }
2304 } else {
2305 *arg++ = pgm;
2306 *arg++ = name;
2307 }
2308 *arg = NULL;
2309 fflush(NULL);
2310 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2311 remove_tempfile();
2312 if (retval) {
2313 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2314 exit(1);
2315 }
2316 }
2317
2318 static int similarity_index(struct diff_filepair *p)
2319 {
2320 return p->score * 100 / MAX_SCORE;
2321 }
2322
2323 static void fill_metainfo(struct strbuf *msg,
2324 const char *name,
2325 const char *other,
2326 struct diff_filespec *one,
2327 struct diff_filespec *two,
2328 struct diff_options *o,
2329 struct diff_filepair *p,
2330 int *must_show_header,
2331 int use_color)
2332 {
2333 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2334 const char *reset = diff_get_color(use_color, DIFF_RESET);
2335
2336 *must_show_header = 1;
2337 strbuf_init(msg, PATH_MAX * 2 + 300);
2338 switch (p->status) {
2339 case DIFF_STATUS_COPIED:
2340 strbuf_addf(msg, "%ssimilarity index %d%%",
2341 set, similarity_index(p));
2342 strbuf_addf(msg, "%s\n%scopy from ", reset, set);
2343 quote_c_style(name, msg, NULL, 0);
2344 strbuf_addf(msg, "%s\n%scopy to ", reset, set);
2345 quote_c_style(other, msg, NULL, 0);
2346 strbuf_addf(msg, "%s\n", reset);
2347 break;
2348 case DIFF_STATUS_RENAMED:
2349 strbuf_addf(msg, "%ssimilarity index %d%%",
2350 set, similarity_index(p));
2351 strbuf_addf(msg, "%s\n%srename from ", reset, set);
2352 quote_c_style(name, msg, NULL, 0);
2353 strbuf_addf(msg, "%s\n%srename to ", reset, set);
2354 quote_c_style(other, msg, NULL, 0);
2355 strbuf_addf(msg, "%s\n", reset);
2356 break;
2357 case DIFF_STATUS_MODIFIED:
2358 if (p->score) {
2359 strbuf_addf(msg, "%sdissimilarity index %d%%%s\n",
2360 set, similarity_index(p), reset);
2361 break;
2362 }
2363 /* fallthru */
2364 default:
2365 *must_show_header = 0;
2366 }
2367 if (one && two && hashcmp(one->sha1, two->sha1)) {
2368 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2369
2370 if (DIFF_OPT_TST(o, BINARY)) {
2371 mmfile_t mf;
2372 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2373 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2374 abbrev = 40;
2375 }
2376 strbuf_addf(msg, "%sindex %.*s..%.*s", set,
2377 abbrev, sha1_to_hex(one->sha1),
2378 abbrev, sha1_to_hex(two->sha1));
2379 if (one->mode == two->mode)
2380 strbuf_addf(msg, " %06o", one->mode);
2381 strbuf_addf(msg, "%s\n", reset);
2382 }
2383 }
2384
2385 static void run_diff_cmd(const char *pgm,
2386 const char *name,
2387 const char *other,
2388 const char *attr_path,
2389 struct diff_filespec *one,
2390 struct diff_filespec *two,
2391 struct strbuf *msg,
2392 struct diff_options *o,
2393 struct diff_filepair *p)
2394 {
2395 const char *xfrm_msg = NULL;
2396 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2397 int must_show_header = 0;
2398
2399 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2400 pgm = NULL;
2401 else {
2402 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2403 if (drv && drv->external)
2404 pgm = drv->external;
2405 }
2406
2407 if (msg) {
2408 /*
2409 * don't use colors when the header is intended for an
2410 * external diff driver
2411 */
2412 fill_metainfo(msg, name, other, one, two, o, p,
2413 &must_show_header,
2414 DIFF_OPT_TST(o, COLOR_DIFF) && !pgm);
2415 xfrm_msg = msg->len ? msg->buf : NULL;
2416 }
2417
2418 if (pgm) {
2419 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2420 complete_rewrite);
2421 return;
2422 }
2423 if (one && two)
2424 builtin_diff(name, other ? other : name,
2425 one, two, xfrm_msg, must_show_header,
2426 o, complete_rewrite);
2427 else
2428 fprintf(o->file, "* Unmerged path %s\n", name);
2429 }
2430
2431 static void diff_fill_sha1_info(struct diff_filespec *one)
2432 {
2433 if (DIFF_FILE_VALID(one)) {
2434 if (!one->sha1_valid) {
2435 struct stat st;
2436 if (!strcmp(one->path, "-")) {
2437 hashcpy(one->sha1, null_sha1);
2438 return;
2439 }
2440 if (lstat(one->path, &st) < 0)
2441 die_errno("stat '%s'", one->path);
2442 if (index_path(one->sha1, one->path, &st, 0))
2443 die("cannot hash %s", one->path);
2444 }
2445 }
2446 else
2447 hashclr(one->sha1);
2448 }
2449
2450 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2451 {
2452 /* Strip the prefix but do not molest /dev/null and absolute paths */
2453 if (*namep && **namep != '/')
2454 *namep += prefix_length;
2455 if (*otherp && **otherp != '/')
2456 *otherp += prefix_length;
2457 }
2458
2459 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2460 {
2461 const char *pgm = external_diff();
2462 struct strbuf msg;
2463 struct diff_filespec *one = p->one;
2464 struct diff_filespec *two = p->two;
2465 const char *name;
2466 const char *other;
2467 const char *attr_path;
2468
2469 name = p->one->path;
2470 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2471 attr_path = name;
2472 if (o->prefix_length)
2473 strip_prefix(o->prefix_length, &name, &other);
2474
2475 if (DIFF_PAIR_UNMERGED(p)) {
2476 run_diff_cmd(pgm, name, NULL, attr_path,
2477 NULL, NULL, NULL, o, p);
2478 return;
2479 }
2480
2481 diff_fill_sha1_info(one);
2482 diff_fill_sha1_info(two);
2483
2484 if (!pgm &&
2485 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2486 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2487 /*
2488 * a filepair that changes between file and symlink
2489 * needs to be split into deletion and creation.
2490 */
2491 struct diff_filespec *null = alloc_filespec(two->path);
2492 run_diff_cmd(NULL, name, other, attr_path,
2493 one, null, &msg, o, p);
2494 free(null);
2495 strbuf_release(&msg);
2496
2497 null = alloc_filespec(one->path);
2498 run_diff_cmd(NULL, name, other, attr_path,
2499 null, two, &msg, o, p);
2500 free(null);
2501 }
2502 else
2503 run_diff_cmd(pgm, name, other, attr_path,
2504 one, two, &msg, o, p);
2505
2506 strbuf_release(&msg);
2507 }
2508
2509 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2510 struct diffstat_t *diffstat)
2511 {
2512 const char *name;
2513 const char *other;
2514 int complete_rewrite = 0;
2515
2516 if (DIFF_PAIR_UNMERGED(p)) {
2517 /* unmerged */
2518 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2519 return;
2520 }
2521
2522 name = p->one->path;
2523 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2524
2525 if (o->prefix_length)
2526 strip_prefix(o->prefix_length, &name, &other);
2527
2528 diff_fill_sha1_info(p->one);
2529 diff_fill_sha1_info(p->two);
2530
2531 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2532 complete_rewrite = 1;
2533 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2534 }
2535
2536 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2537 {
2538 const char *name;
2539 const char *other;
2540 const char *attr_path;
2541
2542 if (DIFF_PAIR_UNMERGED(p)) {
2543 /* unmerged */
2544 return;
2545 }
2546
2547 name = p->one->path;
2548 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2549 attr_path = other ? other : name;
2550
2551 if (o->prefix_length)
2552 strip_prefix(o->prefix_length, &name, &other);
2553
2554 diff_fill_sha1_info(p->one);
2555 diff_fill_sha1_info(p->two);
2556
2557 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2558 }
2559
2560 void diff_setup(struct diff_options *options)
2561 {
2562 memset(options, 0, sizeof(*options));
2563
2564 options->file = stdout;
2565
2566 options->line_termination = '\n';
2567 options->break_opt = -1;
2568 options->rename_limit = -1;
2569 options->dirstat_percent = 3;
2570 options->context = 3;
2571
2572 options->change = diff_change;
2573 options->add_remove = diff_addremove;
2574 if (diff_use_color_default > 0)
2575 DIFF_OPT_SET(options, COLOR_DIFF);
2576 options->detect_rename = diff_detect_rename_default;
2577
2578 if (!diff_mnemonic_prefix) {
2579 options->a_prefix = "a/";
2580 options->b_prefix = "b/";
2581 }
2582 }
2583
2584 int diff_setup_done(struct diff_options *options)
2585 {
2586 int count = 0;
2587
2588 if (options->output_format & DIFF_FORMAT_NAME)
2589 count++;
2590 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2591 count++;
2592 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2593 count++;
2594 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2595 count++;
2596 if (count > 1)
2597 die("--name-only, --name-status, --check and -s are mutually exclusive");
2598
2599 /*
2600 * Most of the time we can say "there are changes"
2601 * only by checking if there are changed paths, but
2602 * --ignore-whitespace* options force us to look
2603 * inside contents.
2604 */
2605
2606 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
2607 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
2608 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
2609 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
2610 else
2611 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
2612
2613 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2614 options->detect_rename = DIFF_DETECT_COPY;
2615
2616 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2617 options->prefix = NULL;
2618 if (options->prefix)
2619 options->prefix_length = strlen(options->prefix);
2620 else
2621 options->prefix_length = 0;
2622
2623 if (options->output_format & (DIFF_FORMAT_NAME |
2624 DIFF_FORMAT_NAME_STATUS |
2625 DIFF_FORMAT_CHECKDIFF |
2626 DIFF_FORMAT_NO_OUTPUT))
2627 options->output_format &= ~(DIFF_FORMAT_RAW |
2628 DIFF_FORMAT_NUMSTAT |
2629 DIFF_FORMAT_DIFFSTAT |
2630 DIFF_FORMAT_SHORTSTAT |
2631 DIFF_FORMAT_DIRSTAT |
2632 DIFF_FORMAT_SUMMARY |
2633 DIFF_FORMAT_PATCH);
2634
2635 /*
2636 * These cases always need recursive; we do not drop caller-supplied
2637 * recursive bits for other formats here.
2638 */
2639 if (options->output_format & (DIFF_FORMAT_PATCH |
2640 DIFF_FORMAT_NUMSTAT |
2641 DIFF_FORMAT_DIFFSTAT |
2642 DIFF_FORMAT_SHORTSTAT |
2643 DIFF_FORMAT_DIRSTAT |
2644 DIFF_FORMAT_SUMMARY |
2645 DIFF_FORMAT_CHECKDIFF))
2646 DIFF_OPT_SET(options, RECURSIVE);
2647 /*
2648 * Also pickaxe would not work very well if you do not say recursive
2649 */
2650 if (options->pickaxe)
2651 DIFF_OPT_SET(options, RECURSIVE);
2652 /*
2653 * When patches are generated, submodules diffed against the work tree
2654 * must be checked for dirtiness too so it can be shown in the output
2655 */
2656 if (options->output_format & DIFF_FORMAT_PATCH)
2657 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
2658
2659 if (options->detect_rename && options->rename_limit < 0)
2660 options->rename_limit = diff_rename_limit_default;
2661 if (options->setup & DIFF_SETUP_USE_CACHE) {
2662 if (!active_cache)
2663 /* read-cache does not die even when it fails
2664 * so it is safe for us to do this here. Also
2665 * it does not smudge active_cache or active_nr
2666 * when it fails, so we do not have to worry about
2667 * cleaning it up ourselves either.
2668 */
2669 read_cache();
2670 }
2671 if (options->abbrev <= 0 || 40 < options->abbrev)
2672 options->abbrev = 40; /* full */
2673
2674 /*
2675 * It does not make sense to show the first hit we happened
2676 * to have found. It does not make sense not to return with
2677 * exit code in such a case either.
2678 */
2679 if (DIFF_OPT_TST(options, QUICK)) {
2680 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2681 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2682 }
2683
2684 return 0;
2685 }
2686
2687 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2688 {
2689 char c, *eq;
2690 int len;
2691
2692 if (*arg != '-')
2693 return 0;
2694 c = *++arg;
2695 if (!c)
2696 return 0;
2697 if (c == arg_short) {
2698 c = *++arg;
2699 if (!c)
2700 return 1;
2701 if (val && isdigit(c)) {
2702 char *end;
2703 int n = strtoul(arg, &end, 10);
2704 if (*end)
2705 return 0;
2706 *val = n;
2707 return 1;
2708 }
2709 return 0;
2710 }
2711 if (c != '-')
2712 return 0;
2713 arg++;
2714 eq = strchr(arg, '=');
2715 if (eq)
2716 len = eq - arg;
2717 else
2718 len = strlen(arg);
2719 if (!len || strncmp(arg, arg_long, len))
2720 return 0;
2721 if (eq) {
2722 int n;
2723 char *end;
2724 if (!isdigit(*++eq))
2725 return 0;
2726 n = strtoul(eq, &end, 10);
2727 if (*end)
2728 return 0;
2729 *val = n;
2730 }
2731 return 1;
2732 }
2733
2734 static int diff_scoreopt_parse(const char *opt);
2735
2736 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2737 {
2738 const char *arg = av[0];
2739
2740 /* Output format options */
2741 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2742 options->output_format |= DIFF_FORMAT_PATCH;
2743 else if (opt_arg(arg, 'U', "unified", &options->context))
2744 options->output_format |= DIFF_FORMAT_PATCH;
2745 else if (!strcmp(arg, "--raw"))
2746 options->output_format |= DIFF_FORMAT_RAW;
2747 else if (!strcmp(arg, "--patch-with-raw"))
2748 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2749 else if (!strcmp(arg, "--numstat"))
2750 options->output_format |= DIFF_FORMAT_NUMSTAT;
2751 else if (!strcmp(arg, "--shortstat"))
2752 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2753 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2754 options->output_format |= DIFF_FORMAT_DIRSTAT;
2755 else if (!strcmp(arg, "--cumulative")) {
2756 options->output_format |= DIFF_FORMAT_DIRSTAT;
2757 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
2758 } else if (opt_arg(arg, 0, "dirstat-by-file",
2759 &options->dirstat_percent)) {
2760 options->output_format |= DIFF_FORMAT_DIRSTAT;
2761 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
2762 }
2763 else if (!strcmp(arg, "--check"))
2764 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2765 else if (!strcmp(arg, "--summary"))
2766 options->output_format |= DIFF_FORMAT_SUMMARY;
2767 else if (!strcmp(arg, "--patch-with-stat"))
2768 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2769 else if (!strcmp(arg, "--name-only"))
2770 options->output_format |= DIFF_FORMAT_NAME;
2771 else if (!strcmp(arg, "--name-status"))
2772 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2773 else if (!strcmp(arg, "-s"))
2774 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2775 else if (!prefixcmp(arg, "--stat")) {
2776 char *end;
2777 int width = options->stat_width;
2778 int name_width = options->stat_name_width;
2779 arg += 6;
2780 end = (char *)arg;
2781
2782 switch (*arg) {
2783 case '-':
2784 if (!prefixcmp(arg, "-width="))
2785 width = strtoul(arg + 7, &end, 10);
2786 else if (!prefixcmp(arg, "-name-width="))
2787 name_width = strtoul(arg + 12, &end, 10);
2788 break;
2789 case '=':
2790 width = strtoul(arg+1, &end, 10);
2791 if (*end == ',')
2792 name_width = strtoul(end+1, &end, 10);
2793 }
2794
2795 /* Important! This checks all the error cases! */
2796 if (*end)
2797 return 0;
2798 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2799 options->stat_name_width = name_width;
2800 options->stat_width = width;
2801 }
2802
2803 /* renames options */
2804 else if (!prefixcmp(arg, "-B")) {
2805 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2806 return -1;
2807 }
2808 else if (!prefixcmp(arg, "-M")) {
2809 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2810 return -1;
2811 options->detect_rename = DIFF_DETECT_RENAME;
2812 }
2813 else if (!prefixcmp(arg, "-C")) {
2814 if (options->detect_rename == DIFF_DETECT_COPY)
2815 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2816 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2817 return -1;
2818 options->detect_rename = DIFF_DETECT_COPY;
2819 }
2820 else if (!strcmp(arg, "--no-renames"))
2821 options->detect_rename = 0;
2822 else if (!strcmp(arg, "--relative"))
2823 DIFF_OPT_SET(options, RELATIVE_NAME);
2824 else if (!prefixcmp(arg, "--relative=")) {
2825 DIFF_OPT_SET(options, RELATIVE_NAME);
2826 options->prefix = arg + 11;
2827 }
2828
2829 /* xdiff options */
2830 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2831 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
2832 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2833 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
2834 else if (!strcmp(arg, "--ignore-space-at-eol"))
2835 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
2836 else if (!strcmp(arg, "--patience"))
2837 DIFF_XDL_SET(options, PATIENCE_DIFF);
2838
2839 /* flags options */
2840 else if (!strcmp(arg, "--binary")) {
2841 options->output_format |= DIFF_FORMAT_PATCH;
2842 DIFF_OPT_SET(options, BINARY);
2843 }
2844 else if (!strcmp(arg, "--full-index"))
2845 DIFF_OPT_SET(options, FULL_INDEX);
2846 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2847 DIFF_OPT_SET(options, TEXT);
2848 else if (!strcmp(arg, "-R"))
2849 DIFF_OPT_SET(options, REVERSE_DIFF);
2850 else if (!strcmp(arg, "--find-copies-harder"))
2851 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2852 else if (!strcmp(arg, "--follow"))
2853 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2854 else if (!strcmp(arg, "--color"))
2855 DIFF_OPT_SET(options, COLOR_DIFF);
2856 else if (!prefixcmp(arg, "--color=")) {
2857 int value = git_config_colorbool(NULL, arg+8, -1);
2858 if (value == 0)
2859 DIFF_OPT_CLR(options, COLOR_DIFF);
2860 else if (value > 0)
2861 DIFF_OPT_SET(options, COLOR_DIFF);
2862 else
2863 return error("option `color' expects \"always\", \"auto\", or \"never\"");
2864 }
2865 else if (!strcmp(arg, "--no-color"))
2866 DIFF_OPT_CLR(options, COLOR_DIFF);
2867 else if (!strcmp(arg, "--color-words")) {
2868 DIFF_OPT_SET(options, COLOR_DIFF);
2869 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2870 }
2871 else if (!prefixcmp(arg, "--color-words=")) {
2872 DIFF_OPT_SET(options, COLOR_DIFF);
2873 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2874 options->word_regex = arg + 14;
2875 }
2876 else if (!strcmp(arg, "--exit-code"))
2877 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2878 else if (!strcmp(arg, "--quiet"))
2879 DIFF_OPT_SET(options, QUICK);
2880 else if (!strcmp(arg, "--ext-diff"))
2881 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2882 else if (!strcmp(arg, "--no-ext-diff"))
2883 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2884 else if (!strcmp(arg, "--textconv"))
2885 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
2886 else if (!strcmp(arg, "--no-textconv"))
2887 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
2888 else if (!strcmp(arg, "--ignore-submodules"))
2889 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2890 else if (!strcmp(arg, "--submodule"))
2891 DIFF_OPT_SET(options, SUBMODULE_LOG);
2892 else if (!prefixcmp(arg, "--submodule=")) {
2893 if (!strcmp(arg + 12, "log"))
2894 DIFF_OPT_SET(options, SUBMODULE_LOG);
2895 }
2896
2897 /* misc options */
2898 else if (!strcmp(arg, "-z"))
2899 options->line_termination = 0;
2900 else if (!prefixcmp(arg, "-l"))
2901 options->rename_limit = strtoul(arg+2, NULL, 10);
2902 else if (!prefixcmp(arg, "-S"))
2903 options->pickaxe = arg + 2;
2904 else if (!strcmp(arg, "--pickaxe-all"))
2905 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2906 else if (!strcmp(arg, "--pickaxe-regex"))
2907 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2908 else if (!prefixcmp(arg, "-O"))
2909 options->orderfile = arg + 2;
2910 else if (!prefixcmp(arg, "--diff-filter="))
2911 options->filter = arg + 14;
2912 else if (!strcmp(arg, "--abbrev"))
2913 options->abbrev = DEFAULT_ABBREV;
2914 else if (!prefixcmp(arg, "--abbrev=")) {
2915 options->abbrev = strtoul(arg + 9, NULL, 10);
2916 if (options->abbrev < MINIMUM_ABBREV)
2917 options->abbrev = MINIMUM_ABBREV;
2918 else if (40 < options->abbrev)
2919 options->abbrev = 40;
2920 }
2921 else if (!prefixcmp(arg, "--src-prefix="))
2922 options->a_prefix = arg + 13;
2923 else if (!prefixcmp(arg, "--dst-prefix="))
2924 options->b_prefix = arg + 13;
2925 else if (!strcmp(arg, "--no-prefix"))
2926 options->a_prefix = options->b_prefix = "";
2927 else if (opt_arg(arg, '\0', "inter-hunk-context",
2928 &options->interhunkcontext))
2929 ;
2930 else if (!prefixcmp(arg, "--output=")) {
2931 options->file = fopen(arg + strlen("--output="), "w");
2932 if (!options->file)
2933 die_errno("Could not open '%s'", arg + strlen("--output="));
2934 options->close_file = 1;
2935 } else
2936 return 0;
2937 return 1;
2938 }
2939
2940 static int parse_num(const char **cp_p)
2941 {
2942 unsigned long num, scale;
2943 int ch, dot;
2944 const char *cp = *cp_p;
2945
2946 num = 0;
2947 scale = 1;
2948 dot = 0;
2949 for (;;) {
2950 ch = *cp;
2951 if ( !dot && ch == '.' ) {
2952 scale = 1;
2953 dot = 1;
2954 } else if ( ch == '%' ) {
2955 scale = dot ? scale*100 : 100;
2956 cp++; /* % is always at the end */
2957 break;
2958 } else if ( ch >= '0' && ch <= '9' ) {
2959 if ( scale < 100000 ) {
2960 scale *= 10;
2961 num = (num*10) + (ch-'0');
2962 }
2963 } else {
2964 break;
2965 }
2966 cp++;
2967 }
2968 *cp_p = cp;
2969
2970 /* user says num divided by scale and we say internally that
2971 * is MAX_SCORE * num / scale.
2972 */
2973 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2974 }
2975
2976 static int diff_scoreopt_parse(const char *opt)
2977 {
2978 int opt1, opt2, cmd;
2979
2980 if (*opt++ != '-')
2981 return -1;
2982 cmd = *opt++;
2983 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2984 return -1; /* that is not a -M, -C nor -B option */
2985
2986 opt1 = parse_num(&opt);
2987 if (cmd != 'B')
2988 opt2 = 0;
2989 else {
2990 if (*opt == 0)
2991 opt2 = 0;
2992 else if (*opt != '/')
2993 return -1; /* we expect -B80/99 or -B80 */
2994 else {
2995 opt++;
2996 opt2 = parse_num(&opt);
2997 }
2998 }
2999 if (*opt != 0)
3000 return -1;
3001 return opt1 | (opt2 << 16);
3002 }
3003
3004 struct diff_queue_struct diff_queued_diff;
3005
3006 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3007 {
3008 if (queue->alloc <= queue->nr) {
3009 queue->alloc = alloc_nr(queue->alloc);
3010 queue->queue = xrealloc(queue->queue,
3011 sizeof(dp) * queue->alloc);
3012 }
3013 queue->queue[queue->nr++] = dp;
3014 }
3015
3016 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3017 struct diff_filespec *one,
3018 struct diff_filespec *two)
3019 {
3020 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3021 dp->one = one;
3022 dp->two = two;
3023 if (queue)
3024 diff_q(queue, dp);
3025 return dp;
3026 }
3027
3028 void diff_free_filepair(struct diff_filepair *p)
3029 {
3030 free_filespec(p->one);
3031 free_filespec(p->two);
3032 free(p);
3033 }
3034
3035 /* This is different from find_unique_abbrev() in that
3036 * it stuffs the result with dots for alignment.
3037 */
3038 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3039 {
3040 int abblen;
3041 const char *abbrev;
3042 if (len == 40)
3043 return sha1_to_hex(sha1);
3044
3045 abbrev = find_unique_abbrev(sha1, len);
3046 abblen = strlen(abbrev);
3047 if (abblen < 37) {
3048 static char hex[41];
3049 if (len < abblen && abblen <= len + 2)
3050 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3051 else
3052 sprintf(hex, "%s...", abbrev);
3053 return hex;
3054 }
3055 return sha1_to_hex(sha1);
3056 }
3057
3058 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3059 {
3060 int line_termination = opt->line_termination;
3061 int inter_name_termination = line_termination ? '\t' : '\0';
3062
3063 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3064 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3065 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3066 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3067 }
3068 if (p->score) {
3069 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3070 inter_name_termination);
3071 } else {
3072 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3073 }
3074
3075 if (p->status == DIFF_STATUS_COPIED ||
3076 p->status == DIFF_STATUS_RENAMED) {
3077 const char *name_a, *name_b;
3078 name_a = p->one->path;
3079 name_b = p->two->path;
3080 strip_prefix(opt->prefix_length, &name_a, &name_b);
3081 write_name_quoted(name_a, opt->file, inter_name_termination);
3082 write_name_quoted(name_b, opt->file, line_termination);
3083 } else {
3084 const char *name_a, *name_b;
3085 name_a = p->one->mode ? p->one->path : p->two->path;
3086 name_b = NULL;
3087 strip_prefix(opt->prefix_length, &name_a, &name_b);
3088 write_name_quoted(name_a, opt->file, line_termination);
3089 }
3090 }
3091
3092 int diff_unmodified_pair(struct diff_filepair *p)
3093 {
3094 /* This function is written stricter than necessary to support
3095 * the currently implemented transformers, but the idea is to
3096 * let transformers to produce diff_filepairs any way they want,
3097 * and filter and clean them up here before producing the output.
3098 */
3099 struct diff_filespec *one = p->one, *two = p->two;
3100
3101 if (DIFF_PAIR_UNMERGED(p))
3102 return 0; /* unmerged is interesting */
3103
3104 /* deletion, addition, mode or type change
3105 * and rename are all interesting.
3106 */
3107 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3108 DIFF_PAIR_MODE_CHANGED(p) ||
3109 strcmp(one->path, two->path))
3110 return 0;
3111
3112 /* both are valid and point at the same path. that is, we are
3113 * dealing with a change.
3114 */
3115 if (one->sha1_valid && two->sha1_valid &&
3116 !hashcmp(one->sha1, two->sha1) &&
3117 !one->dirty_submodule && !two->dirty_submodule)
3118 return 1; /* no change */
3119 if (!one->sha1_valid && !two->sha1_valid)
3120 return 1; /* both look at the same file on the filesystem. */
3121 return 0;
3122 }
3123
3124 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3125 {
3126 if (diff_unmodified_pair(p))
3127 return;
3128
3129 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3130 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3131 return; /* no tree diffs in patch format */
3132
3133 run_diff(p, o);
3134 }
3135
3136 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3137 struct diffstat_t *diffstat)
3138 {
3139 if (diff_unmodified_pair(p))
3140 return;
3141
3142 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3143 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3144 return; /* no tree diffs in patch format */
3145
3146 run_diffstat(p, o, diffstat);
3147 }
3148
3149 static void diff_flush_checkdiff(struct diff_filepair *p,
3150 struct diff_options *o)
3151 {
3152 if (diff_unmodified_pair(p))
3153 return;
3154
3155 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3156 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3157 return; /* no tree diffs in patch format */
3158
3159 run_checkdiff(p, o);
3160 }
3161
3162 int diff_queue_is_empty(void)
3163 {
3164 struct diff_queue_struct *q = &diff_queued_diff;
3165 int i;
3166 for (i = 0; i < q->nr; i++)
3167 if (!diff_unmodified_pair(q->queue[i]))
3168 return 0;
3169 return 1;
3170 }
3171
3172 #if DIFF_DEBUG
3173 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3174 {
3175 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3176 x, one ? one : "",
3177 s->path,
3178 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3179 s->mode,
3180 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3181 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3182 x, one ? one : "",
3183 s->size, s->xfrm_flags);
3184 }
3185
3186 void diff_debug_filepair(const struct diff_filepair *p, int i)
3187 {
3188 diff_debug_filespec(p->one, i, "one");
3189 diff_debug_filespec(p->two, i, "two");
3190 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3191 p->score, p->status ? p->status : '?',
3192 p->one->rename_used, p->broken_pair);
3193 }
3194
3195 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3196 {
3197 int i;
3198 if (msg)
3199 fprintf(stderr, "%s\n", msg);
3200 fprintf(stderr, "q->nr = %d\n", q->nr);
3201 for (i = 0; i < q->nr; i++) {
3202 struct diff_filepair *p = q->queue[i];
3203 diff_debug_filepair(p, i);
3204 }
3205 }
3206 #endif
3207
3208 static void diff_resolve_rename_copy(void)
3209 {
3210 int i;
3211 struct diff_filepair *p;
3212 struct diff_queue_struct *q = &diff_queued_diff;
3213
3214 diff_debug_queue("resolve-rename-copy", q);
3215
3216 for (i = 0; i < q->nr; i++) {
3217 p = q->queue[i];
3218 p->status = 0; /* undecided */
3219 if (DIFF_PAIR_UNMERGED(p))
3220 p->status = DIFF_STATUS_UNMERGED;
3221 else if (!DIFF_FILE_VALID(p->one))
3222 p->status = DIFF_STATUS_ADDED;
3223 else if (!DIFF_FILE_VALID(p->two))
3224 p->status = DIFF_STATUS_DELETED;
3225 else if (DIFF_PAIR_TYPE_CHANGED(p))
3226 p->status = DIFF_STATUS_TYPE_CHANGED;
3227
3228 /* from this point on, we are dealing with a pair
3229 * whose both sides are valid and of the same type, i.e.
3230 * either in-place edit or rename/copy edit.
3231 */
3232 else if (DIFF_PAIR_RENAME(p)) {
3233 /*
3234 * A rename might have re-connected a broken
3235 * pair up, causing the pathnames to be the
3236 * same again. If so, that's not a rename at
3237 * all, just a modification..
3238 *
3239 * Otherwise, see if this source was used for
3240 * multiple renames, in which case we decrement
3241 * the count, and call it a copy.
3242 */
3243 if (!strcmp(p->one->path, p->two->path))
3244 p->status = DIFF_STATUS_MODIFIED;
3245 else if (--p->one->rename_used > 0)
3246 p->status = DIFF_STATUS_COPIED;
3247 else
3248 p->status = DIFF_STATUS_RENAMED;
3249 }
3250 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3251 p->one->mode != p->two->mode ||
3252 p->one->dirty_submodule ||
3253 p->two->dirty_submodule ||
3254 is_null_sha1(p->one->sha1))
3255 p->status = DIFF_STATUS_MODIFIED;
3256 else {
3257 /* This is a "no-change" entry and should not
3258 * happen anymore, but prepare for broken callers.
3259 */
3260 error("feeding unmodified %s to diffcore",
3261 p->one->path);
3262 p->status = DIFF_STATUS_UNKNOWN;
3263 }
3264 }
3265 diff_debug_queue("resolve-rename-copy done", q);
3266 }
3267
3268 static int check_pair_status(struct diff_filepair *p)
3269 {
3270 switch (p->status) {
3271 case DIFF_STATUS_UNKNOWN:
3272 return 0;
3273 case 0:
3274 die("internal error in diff-resolve-rename-copy");
3275 default:
3276 return 1;
3277 }
3278 }
3279
3280 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3281 {
3282 int fmt = opt->output_format;
3283
3284 if (fmt & DIFF_FORMAT_CHECKDIFF)
3285 diff_flush_checkdiff(p, opt);
3286 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3287 diff_flush_raw(p, opt);
3288 else if (fmt & DIFF_FORMAT_NAME) {
3289 const char *name_a, *name_b;
3290 name_a = p->two->path;
3291 name_b = NULL;
3292 strip_prefix(opt->prefix_length, &name_a, &name_b);
3293 write_name_quoted(name_a, opt->file, opt->line_termination);
3294 }
3295 }
3296
3297 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3298 {
3299 if (fs->mode)
3300 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3301 else
3302 fprintf(file, " %s ", newdelete);
3303 write_name_quoted(fs->path, file, '\n');
3304 }
3305
3306
3307 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
3308 {
3309 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3310 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
3311 show_name ? ' ' : '\n');
3312 if (show_name) {
3313 write_name_quoted(p->two->path, file, '\n');
3314 }
3315 }
3316 }
3317
3318 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
3319 {
3320 char *names = pprint_rename(p->one->path, p->two->path);
3321
3322 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3323 free(names);
3324 show_mode_change(file, p, 0);
3325 }
3326
3327 static void diff_summary(FILE *file, struct diff_filepair *p)
3328 {
3329 switch(p->status) {
3330 case DIFF_STATUS_DELETED:
3331 show_file_mode_name(file, "delete", p->one);
3332 break;
3333 case DIFF_STATUS_ADDED:
3334 show_file_mode_name(file, "create", p->two);
3335 break;
3336 case DIFF_STATUS_COPIED:
3337 show_rename_copy(file, "copy", p);
3338 break;
3339 case DIFF_STATUS_RENAMED:
3340 show_rename_copy(file, "rename", p);
3341 break;
3342 default:
3343 if (p->score) {
3344 fputs(" rewrite ", file);
3345 write_name_quoted(p->two->path, file, ' ');
3346 fprintf(file, "(%d%%)\n", similarity_index(p));
3347 }
3348 show_mode_change(file, p, !p->score);
3349 break;
3350 }
3351 }
3352
3353 struct patch_id_t {
3354 git_SHA_CTX *ctx;
3355 int patchlen;
3356 };
3357
3358 static int remove_space(char *line, int len)
3359 {
3360 int i;
3361 char *dst = line;
3362 unsigned char c;
3363
3364 for (i = 0; i < len; i++)
3365 if (!isspace((c = line[i])))
3366 *dst++ = c;
3367
3368 return dst - line;
3369 }
3370
3371 static void patch_id_consume(void *priv, char *line, unsigned long len)
3372 {
3373 struct patch_id_t *data = priv;
3374 int new_len;
3375
3376 /* Ignore line numbers when computing the SHA1 of the patch */
3377 if (!prefixcmp(line, "@@ -"))
3378 return;
3379
3380 new_len = remove_space(line, len);
3381
3382 git_SHA1_Update(data->ctx, line, new_len);
3383 data->patchlen += new_len;
3384 }
3385
3386 /* returns 0 upon success, and writes result into sha1 */
3387 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3388 {
3389 struct diff_queue_struct *q = &diff_queued_diff;
3390 int i;
3391 git_SHA_CTX ctx;
3392 struct patch_id_t data;
3393 char buffer[PATH_MAX * 4 + 20];
3394
3395 git_SHA1_Init(&ctx);
3396 memset(&data, 0, sizeof(struct patch_id_t));
3397 data.ctx = &ctx;
3398
3399 for (i = 0; i < q->nr; i++) {
3400 xpparam_t xpp;
3401 xdemitconf_t xecfg;
3402 mmfile_t mf1, mf2;
3403 struct diff_filepair *p = q->queue[i];
3404 int len1, len2;
3405
3406 memset(&xpp, 0, sizeof(xpp));
3407 memset(&xecfg, 0, sizeof(xecfg));
3408 if (p->status == 0)
3409 return error("internal diff status error");
3410 if (p->status == DIFF_STATUS_UNKNOWN)
3411 continue;
3412 if (diff_unmodified_pair(p))
3413 continue;
3414 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3415 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3416 continue;
3417 if (DIFF_PAIR_UNMERGED(p))
3418 continue;
3419
3420 diff_fill_sha1_info(p->one);
3421 diff_fill_sha1_info(p->two);
3422 if (fill_mmfile(&mf1, p->one) < 0 ||
3423 fill_mmfile(&mf2, p->two) < 0)
3424 return error("unable to read files to diff");
3425
3426 len1 = remove_space(p->one->path, strlen(p->one->path));
3427 len2 = remove_space(p->two->path, strlen(p->two->path));
3428 if (p->one->mode == 0)
3429 len1 = snprintf(buffer, sizeof(buffer),
3430 "diff--gita/%.*sb/%.*s"
3431 "newfilemode%06o"
3432 "---/dev/null"
3433 "+++b/%.*s",
3434 len1, p->one->path,
3435 len2, p->two->path,
3436 p->two->mode,
3437 len2, p->two->path);
3438 else if (p->two->mode == 0)
3439 len1 = snprintf(buffer, sizeof(buffer),
3440 "diff--gita/%.*sb/%.*s"
3441 "deletedfilemode%06o"
3442 "---a/%.*s"
3443 "+++/dev/null",
3444 len1, p->one->path,
3445 len2, p->two->path,
3446 p->one->mode,
3447 len1, p->one->path);
3448 else
3449 len1 = snprintf(buffer, sizeof(buffer),
3450 "diff--gita/%.*sb/%.*s"
3451 "---a/%.*s"
3452 "+++b/%.*s",
3453 len1, p->one->path,
3454 len2, p->two->path,
3455 len1, p->one->path,
3456 len2, p->two->path);
3457 git_SHA1_Update(&ctx, buffer, len1);
3458
3459 xpp.flags = 0;
3460 xecfg.ctxlen = 3;
3461 xecfg.flags = XDL_EMIT_FUNCNAMES;
3462 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3463 &xpp, &xecfg);
3464 }
3465
3466 git_SHA1_Final(sha1, &ctx);
3467 return 0;
3468 }
3469
3470 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3471 {
3472 struct diff_queue_struct *q = &diff_queued_diff;
3473 int i;
3474 int result = diff_get_patch_id(options, sha1);
3475
3476 for (i = 0; i < q->nr; i++)
3477 diff_free_filepair(q->queue[i]);
3478
3479 free(q->queue);
3480 q->queue = NULL;
3481 q->nr = q->alloc = 0;
3482
3483 return result;
3484 }
3485
3486 static int is_summary_empty(const struct diff_queue_struct *q)
3487 {
3488 int i;
3489
3490 for (i = 0; i < q->nr; i++) {
3491 const struct diff_filepair *p = q->queue[i];
3492
3493 switch (p->status) {
3494 case DIFF_STATUS_DELETED:
3495 case DIFF_STATUS_ADDED:
3496 case DIFF_STATUS_COPIED:
3497 case DIFF_STATUS_RENAMED:
3498 return 0;
3499 default:
3500 if (p->score)
3501 return 0;
3502 if (p->one->mode && p->two->mode &&
3503 p->one->mode != p->two->mode)
3504 return 0;
3505 break;
3506 }
3507 }
3508 return 1;
3509 }
3510
3511 void diff_flush(struct diff_options *options)
3512 {
3513 struct diff_queue_struct *q = &diff_queued_diff;
3514 int i, output_format = options->output_format;
3515 int separator = 0;
3516
3517 /*
3518 * Order: raw, stat, summary, patch
3519 * or: name/name-status/checkdiff (other bits clear)
3520 */
3521 if (!q->nr)
3522 goto free_queue;
3523
3524 if (output_format & (DIFF_FORMAT_RAW |
3525 DIFF_FORMAT_NAME |
3526 DIFF_FORMAT_NAME_STATUS |
3527 DIFF_FORMAT_CHECKDIFF)) {
3528 for (i = 0; i < q->nr; i++) {
3529 struct diff_filepair *p = q->queue[i];
3530 if (check_pair_status(p))
3531 flush_one_pair(p, options);
3532 }
3533 separator++;
3534 }
3535
3536 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3537 struct diffstat_t diffstat;
3538
3539 memset(&diffstat, 0, sizeof(struct diffstat_t));
3540 for (i = 0; i < q->nr; i++) {
3541 struct diff_filepair *p = q->queue[i];
3542 if (check_pair_status(p))
3543 diff_flush_stat(p, options, &diffstat);
3544 }
3545 if (output_format & DIFF_FORMAT_NUMSTAT)
3546 show_numstat(&diffstat, options);
3547 if (output_format & DIFF_FORMAT_DIFFSTAT)
3548 show_stats(&diffstat, options);
3549 if (output_format & DIFF_FORMAT_SHORTSTAT)
3550 show_shortstats(&diffstat, options);
3551 free_diffstat_info(&diffstat);
3552 separator++;
3553 }
3554 if (output_format & DIFF_FORMAT_DIRSTAT)
3555 show_dirstat(options);
3556
3557 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3558 for (i = 0; i < q->nr; i++)
3559 diff_summary(options->file, q->queue[i]);
3560 separator++;
3561 }
3562
3563 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
3564 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
3565 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
3566 /*
3567 * run diff_flush_patch for the exit status. setting
3568 * options->file to /dev/null should be safe, becaue we
3569 * aren't supposed to produce any output anyway.
3570 */
3571 if (options->close_file)
3572 fclose(options->file);
3573 options->file = fopen("/dev/null", "w");
3574 if (!options->file)
3575 die_errno("Could not open /dev/null");
3576 options->close_file = 1;
3577 for (i = 0; i < q->nr; i++) {
3578 struct diff_filepair *p = q->queue[i];
3579 if (check_pair_status(p))
3580 diff_flush_patch(p, options);
3581 if (options->found_changes)
3582 break;
3583 }
3584 }
3585
3586 if (output_format & DIFF_FORMAT_PATCH) {
3587 if (separator) {
3588 putc(options->line_termination, options->file);
3589 if (options->stat_sep) {
3590 /* attach patch instead of inline */
3591 fputs(options->stat_sep, options->file);
3592 }
3593 }
3594
3595 for (i = 0; i < q->nr; i++) {
3596 struct diff_filepair *p = q->queue[i];
3597 if (check_pair_status(p))
3598 diff_flush_patch(p, options);
3599 }
3600 }
3601
3602 if (output_format & DIFF_FORMAT_CALLBACK)
3603 options->format_callback(q, options, options->format_callback_data);
3604
3605 for (i = 0; i < q->nr; i++)
3606 diff_free_filepair(q->queue[i]);
3607 free_queue:
3608 free(q->queue);
3609 q->queue = NULL;
3610 q->nr = q->alloc = 0;
3611 if (options->close_file)
3612 fclose(options->file);
3613
3614 /*
3615 * Report the content-level differences with HAS_CHANGES;
3616 * diff_addremove/diff_change does not set the bit when
3617 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
3618 */
3619 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
3620 if (options->found_changes)
3621 DIFF_OPT_SET(options, HAS_CHANGES);
3622 else
3623 DIFF_OPT_CLR(options, HAS_CHANGES);
3624 }
3625 }
3626
3627 static void diffcore_apply_filter(const char *filter)
3628 {
3629 int i;
3630 struct diff_queue_struct *q = &diff_queued_diff;
3631 struct diff_queue_struct outq;
3632 outq.queue = NULL;
3633 outq.nr = outq.alloc = 0;
3634
3635 if (!filter)
3636 return;
3637
3638 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3639 int found;
3640 for (i = found = 0; !found && i < q->nr; i++) {
3641 struct diff_filepair *p = q->queue[i];
3642 if (((p->status == DIFF_STATUS_MODIFIED) &&
3643 ((p->score &&
3644 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3645 (!p->score &&
3646 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3647 ((p->status != DIFF_STATUS_MODIFIED) &&
3648 strchr(filter, p->status)))
3649 found++;
3650 }
3651 if (found)
3652 return;
3653
3654 /* otherwise we will clear the whole queue
3655 * by copying the empty outq at the end of this
3656 * function, but first clear the current entries
3657 * in the queue.
3658 */
3659 for (i = 0; i < q->nr; i++)
3660 diff_free_filepair(q->queue[i]);
3661 }
3662 else {
3663 /* Only the matching ones */
3664 for (i = 0; i < q->nr; i++) {
3665 struct diff_filepair *p = q->queue[i];
3666
3667 if (((p->status == DIFF_STATUS_MODIFIED) &&
3668 ((p->score &&
3669 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3670 (!p->score &&
3671 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3672 ((p->status != DIFF_STATUS_MODIFIED) &&
3673 strchr(filter, p->status)))
3674 diff_q(&outq, p);
3675 else
3676 diff_free_filepair(p);
3677 }
3678 }
3679 free(q->queue);
3680 *q = outq;
3681 }
3682
3683 /* Check whether two filespecs with the same mode and size are identical */
3684 static int diff_filespec_is_identical(struct diff_filespec *one,
3685 struct diff_filespec *two)
3686 {
3687 if (S_ISGITLINK(one->mode))
3688 return 0;
3689 if (diff_populate_filespec(one, 0))
3690 return 0;
3691 if (diff_populate_filespec(two, 0))
3692 return 0;
3693 return !memcmp(one->data, two->data, one->size);
3694 }
3695
3696 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3697 {
3698 int i;
3699 struct diff_queue_struct *q = &diff_queued_diff;
3700 struct diff_queue_struct outq;
3701 outq.queue = NULL;
3702 outq.nr = outq.alloc = 0;
3703
3704 for (i = 0; i < q->nr; i++) {
3705 struct diff_filepair *p = q->queue[i];
3706
3707 /*
3708 * 1. Entries that come from stat info dirtiness
3709 * always have both sides (iow, not create/delete),
3710 * one side of the object name is unknown, with
3711 * the same mode and size. Keep the ones that
3712 * do not match these criteria. They have real
3713 * differences.
3714 *
3715 * 2. At this point, the file is known to be modified,
3716 * with the same mode and size, and the object
3717 * name of one side is unknown. Need to inspect
3718 * the identical contents.
3719 */
3720 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3721 !DIFF_FILE_VALID(p->two) ||
3722 (p->one->sha1_valid && p->two->sha1_valid) ||
3723 (p->one->mode != p->two->mode) ||
3724 diff_populate_filespec(p->one, 1) ||
3725 diff_populate_filespec(p->two, 1) ||
3726 (p->one->size != p->two->size) ||
3727 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3728 diff_q(&outq, p);
3729 else {
3730 /*
3731 * The caller can subtract 1 from skip_stat_unmatch
3732 * to determine how many paths were dirty only
3733 * due to stat info mismatch.
3734 */
3735 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3736 diffopt->skip_stat_unmatch++;
3737 diff_free_filepair(p);
3738 }
3739 }
3740 free(q->queue);
3741 *q = outq;
3742 }
3743
3744 static int diffnamecmp(const void *a_, const void *b_)
3745 {
3746 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
3747 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
3748 const char *name_a, *name_b;
3749
3750 name_a = a->one ? a->one->path : a->two->path;
3751 name_b = b->one ? b->one->path : b->two->path;
3752 return strcmp(name_a, name_b);
3753 }
3754
3755 void diffcore_fix_diff_index(struct diff_options *options)
3756 {
3757 struct diff_queue_struct *q = &diff_queued_diff;
3758 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
3759 }
3760
3761 void diffcore_std(struct diff_options *options)
3762 {
3763 if (options->skip_stat_unmatch)
3764 diffcore_skip_stat_unmatch(options);
3765 if (options->break_opt != -1)
3766 diffcore_break(options->break_opt);
3767 if (options->detect_rename)
3768 diffcore_rename(options);
3769 if (options->break_opt != -1)
3770 diffcore_merge_broken();
3771 if (options->pickaxe)
3772 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3773 if (options->orderfile)
3774 diffcore_order(options->orderfile);
3775 diff_resolve_rename_copy();
3776 diffcore_apply_filter(options->filter);
3777
3778 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
3779 DIFF_OPT_SET(options, HAS_CHANGES);
3780 else
3781 DIFF_OPT_CLR(options, HAS_CHANGES);
3782 }
3783
3784 int diff_result_code(struct diff_options *opt, int status)
3785 {
3786 int result = 0;
3787 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3788 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3789 return status;
3790 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3791 DIFF_OPT_TST(opt, HAS_CHANGES))
3792 result |= 01;
3793 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3794 DIFF_OPT_TST(opt, CHECK_FAILED))
3795 result |= 02;
3796 return result;
3797 }
3798
3799 void diff_addremove(struct diff_options *options,
3800 int addremove, unsigned mode,
3801 const unsigned char *sha1,
3802 const char *concatpath, unsigned dirty_submodule)
3803 {
3804 struct diff_filespec *one, *two;
3805
3806 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3807 return;
3808
3809 /* This may look odd, but it is a preparation for
3810 * feeding "there are unchanged files which should
3811 * not produce diffs, but when you are doing copy
3812 * detection you would need them, so here they are"
3813 * entries to the diff-core. They will be prefixed
3814 * with something like '=' or '*' (I haven't decided
3815 * which but should not make any difference).
3816 * Feeding the same new and old to diff_change()
3817 * also has the same effect.
3818 * Before the final output happens, they are pruned after
3819 * merged into rename/copy pairs as appropriate.
3820 */
3821 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3822 addremove = (addremove == '+' ? '-' :
3823 addremove == '-' ? '+' : addremove);
3824
3825 if (options->prefix &&
3826 strncmp(concatpath, options->prefix, options->prefix_length))
3827 return;
3828
3829 one = alloc_filespec(concatpath);
3830 two = alloc_filespec(concatpath);
3831
3832 if (addremove != '+')
3833 fill_filespec(one, sha1, mode);
3834 if (addremove != '-') {
3835 fill_filespec(two, sha1, mode);
3836 two->dirty_submodule = dirty_submodule;
3837 }
3838
3839 diff_queue(&diff_queued_diff, one, two);
3840 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
3841 DIFF_OPT_SET(options, HAS_CHANGES);
3842 }
3843
3844 void diff_change(struct diff_options *options,
3845 unsigned old_mode, unsigned new_mode,
3846 const unsigned char *old_sha1,
3847 const unsigned char *new_sha1,
3848 const char *concatpath,
3849 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
3850 {
3851 struct diff_filespec *one, *two;
3852
3853 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3854 && S_ISGITLINK(new_mode))
3855 return;
3856
3857 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3858 unsigned tmp;
3859 const unsigned char *tmp_c;
3860 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3861 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3862 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
3863 new_dirty_submodule = tmp;
3864 }
3865
3866 if (options->prefix &&
3867 strncmp(concatpath, options->prefix, options->prefix_length))
3868 return;
3869
3870 one = alloc_filespec(concatpath);
3871 two = alloc_filespec(concatpath);
3872 fill_filespec(one, old_sha1, old_mode);
3873 fill_filespec(two, new_sha1, new_mode);
3874 one->dirty_submodule = old_dirty_submodule;
3875 two->dirty_submodule = new_dirty_submodule;
3876
3877 diff_queue(&diff_queued_diff, one, two);
3878 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
3879 DIFF_OPT_SET(options, HAS_CHANGES);
3880 }
3881
3882 void diff_unmerge(struct diff_options *options,
3883 const char *path,
3884 unsigned mode, const unsigned char *sha1)
3885 {
3886 struct diff_filespec *one, *two;
3887
3888 if (options->prefix &&
3889 strncmp(path, options->prefix, options->prefix_length))
3890 return;
3891
3892 one = alloc_filespec(path);
3893 two = alloc_filespec(path);
3894 fill_filespec(one, sha1, mode);
3895 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3896 }
3897
3898 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
3899 size_t *outsize)
3900 {
3901 struct diff_tempfile *temp;
3902 const char *argv[3];
3903 const char **arg = argv;
3904 struct child_process child;
3905 struct strbuf buf = STRBUF_INIT;
3906 int err = 0;
3907
3908 temp = prepare_temp_file(spec->path, spec);
3909 *arg++ = pgm;
3910 *arg++ = temp->name;
3911 *arg = NULL;
3912
3913 memset(&child, 0, sizeof(child));
3914 child.use_shell = 1;
3915 child.argv = argv;
3916 child.out = -1;
3917 if (start_command(&child)) {
3918 remove_tempfile();
3919 return NULL;
3920 }
3921
3922 if (strbuf_read(&buf, child.out, 0) < 0)
3923 err = error("error reading from textconv command '%s'", pgm);
3924 close(child.out);
3925
3926 if (finish_command(&child) || err) {
3927 strbuf_release(&buf);
3928 remove_tempfile();
3929 return NULL;
3930 }
3931 remove_tempfile();
3932
3933 return strbuf_detach(&buf, outsize);
3934 }
git with Jakub Narębski modifications