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[git/jnareb-git.git] / diff.c
blobe40c1271da3f2ea433b55f770408e8d3a0f8a521
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 = XDF_NEED_MINIMAL;
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 struct diff_options *o,
1604 int complete_rewrite)
1605 {
1606 mmfile_t mf1, mf2;
1607 const char *lbl[2];
1608 char *a_one, *b_two;
1609 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1610 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1611 const char *a_prefix, *b_prefix;
1612 const char *textconv_one = NULL, *textconv_two = NULL;
1613 struct strbuf header = STRBUF_INIT;
1614
1615 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
1616 (!one->mode || S_ISGITLINK(one->mode)) &&
1617 (!two->mode || S_ISGITLINK(two->mode))) {
1618 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
1619 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
1620 show_submodule_summary(o->file, one ? one->path : two->path,
1621 one->sha1, two->sha1, two->dirty_submodule,
1622 del, add, reset);
1623 return;
1624 }
1625
1626 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1627 textconv_one = get_textconv(one);
1628 textconv_two = get_textconv(two);
1629 }
1630
1631 diff_set_mnemonic_prefix(o, "a/", "b/");
1632 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1633 a_prefix = o->b_prefix;
1634 b_prefix = o->a_prefix;
1635 } else {
1636 a_prefix = o->a_prefix;
1637 b_prefix = o->b_prefix;
1638 }
1639
1640 /* Never use a non-valid filename anywhere if at all possible */
1641 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1642 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1643
1644 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1645 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1646 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1647 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1648 strbuf_addf(&header, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1649 if (lbl[0][0] == '/') {
1650 /* /dev/null */
1651 strbuf_addf(&header, "%snew file mode %06o%s\n", set, two->mode, reset);
1652 if (xfrm_msg && xfrm_msg[0])
1653 strbuf_addf(&header, "%s%s%s\n", set, xfrm_msg, reset);
1654 }
1655 else if (lbl[1][0] == '/') {
1656 strbuf_addf(&header, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1657 if (xfrm_msg && xfrm_msg[0])
1658 strbuf_addf(&header, "%s%s%s\n", set, xfrm_msg, reset);
1659 }
1660 else {
1661 if (one->mode != two->mode) {
1662 strbuf_addf(&header, "%sold mode %06o%s\n", set, one->mode, reset);
1663 strbuf_addf(&header, "%snew mode %06o%s\n", set, two->mode, reset);
1664 }
1665 if (xfrm_msg && xfrm_msg[0])
1666 strbuf_addf(&header, "%s%s%s\n", set, xfrm_msg, reset);
1667
1668 /*
1669 * we do not run diff between different kind
1670 * of objects.
1671 */
1672 if ((one->mode ^ two->mode) & S_IFMT)
1673 goto free_ab_and_return;
1674 if (complete_rewrite &&
1675 (textconv_one || !diff_filespec_is_binary(one)) &&
1676 (textconv_two || !diff_filespec_is_binary(two))) {
1677 fprintf(o->file, "%s", header.buf);
1678 strbuf_reset(&header);
1679 emit_rewrite_diff(name_a, name_b, one, two,
1680 textconv_one, textconv_two, o);
1681 o->found_changes = 1;
1682 goto free_ab_and_return;
1683 }
1684 }
1685
1686 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1687 die("unable to read files to diff");
1688
1689 if (!DIFF_OPT_TST(o, TEXT) &&
1690 ( (diff_filespec_is_binary(one) && !textconv_one) ||
1691 (diff_filespec_is_binary(two) && !textconv_two) )) {
1692 /* Quite common confusing case */
1693 if (mf1.size == mf2.size &&
1694 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1695 goto free_ab_and_return;
1696 fprintf(o->file, "%s", header.buf);
1697 strbuf_reset(&header);
1698 if (DIFF_OPT_TST(o, BINARY))
1699 emit_binary_diff(o->file, &mf1, &mf2);
1700 else
1701 fprintf(o->file, "Binary files %s and %s differ\n",
1702 lbl[0], lbl[1]);
1703 o->found_changes = 1;
1704 }
1705 else {
1706 /* Crazy xdl interfaces.. */
1707 const char *diffopts = getenv("GIT_DIFF_OPTS");
1708 xpparam_t xpp;
1709 xdemitconf_t xecfg;
1710 struct emit_callback ecbdata;
1711 const struct userdiff_funcname *pe;
1712
1713 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS)) {
1714 fprintf(o->file, "%s", header.buf);
1715 strbuf_reset(&header);
1716 }
1717
1718 if (textconv_one) {
1719 size_t size;
1720 mf1.ptr = run_textconv(textconv_one, one, &size);
1721 if (!mf1.ptr)
1722 die("unable to read files to diff");
1723 mf1.size = size;
1724 }
1725 if (textconv_two) {
1726 size_t size;
1727 mf2.ptr = run_textconv(textconv_two, two, &size);
1728 if (!mf2.ptr)
1729 die("unable to read files to diff");
1730 mf2.size = size;
1731 }
1732
1733 pe = diff_funcname_pattern(one);
1734 if (!pe)
1735 pe = diff_funcname_pattern(two);
1736
1737 memset(&xpp, 0, sizeof(xpp));
1738 memset(&xecfg, 0, sizeof(xecfg));
1739 memset(&ecbdata, 0, sizeof(ecbdata));
1740 ecbdata.label_path = lbl;
1741 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1742 ecbdata.found_changesp = &o->found_changes;
1743 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1744 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
1745 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1746 ecbdata.file = o->file;
1747 ecbdata.header = header.len ? &header : NULL;
1748 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1749 xecfg.ctxlen = o->context;
1750 xecfg.interhunkctxlen = o->interhunkcontext;
1751 xecfg.flags = XDL_EMIT_FUNCNAMES;
1752 if (pe)
1753 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1754 if (!diffopts)
1755 ;
1756 else if (!prefixcmp(diffopts, "--unified="))
1757 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1758 else if (!prefixcmp(diffopts, "-u"))
1759 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1760 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1761 ecbdata.diff_words =
1762 xcalloc(1, sizeof(struct diff_words_data));
1763 ecbdata.diff_words->file = o->file;
1764 if (!o->word_regex)
1765 o->word_regex = userdiff_word_regex(one);
1766 if (!o->word_regex)
1767 o->word_regex = userdiff_word_regex(two);
1768 if (!o->word_regex)
1769 o->word_regex = diff_word_regex_cfg;
1770 if (o->word_regex) {
1771 ecbdata.diff_words->word_regex = (regex_t *)
1772 xmalloc(sizeof(regex_t));
1773 if (regcomp(ecbdata.diff_words->word_regex,
1774 o->word_regex,
1775 REG_EXTENDED | REG_NEWLINE))
1776 die ("Invalid regular expression: %s",
1777 o->word_regex);
1778 }
1779 }
1780 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
1781 &xpp, &xecfg);
1782 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1783 free_diff_words_data(&ecbdata);
1784 if (textconv_one)
1785 free(mf1.ptr);
1786 if (textconv_two)
1787 free(mf2.ptr);
1788 xdiff_clear_find_func(&xecfg);
1789 }
1790
1791 free_ab_and_return:
1792 strbuf_release(&header);
1793 diff_free_filespec_data(one);
1794 diff_free_filespec_data(two);
1795 free(a_one);
1796 free(b_two);
1797 return;
1798 }
1799
1800 static void builtin_diffstat(const char *name_a, const char *name_b,
1801 struct diff_filespec *one,
1802 struct diff_filespec *two,
1803 struct diffstat_t *diffstat,
1804 struct diff_options *o,
1805 int complete_rewrite)
1806 {
1807 mmfile_t mf1, mf2;
1808 struct diffstat_file *data;
1809
1810 data = diffstat_add(diffstat, name_a, name_b);
1811
1812 if (!one || !two) {
1813 data->is_unmerged = 1;
1814 return;
1815 }
1816 if (complete_rewrite) {
1817 diff_populate_filespec(one, 0);
1818 diff_populate_filespec(two, 0);
1819 data->deleted = count_lines(one->data, one->size);
1820 data->added = count_lines(two->data, two->size);
1821 goto free_and_return;
1822 }
1823 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1824 die("unable to read files to diff");
1825
1826 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1827 data->is_binary = 1;
1828 data->added = mf2.size;
1829 data->deleted = mf1.size;
1830 } else {
1831 /* Crazy xdl interfaces.. */
1832 xpparam_t xpp;
1833 xdemitconf_t xecfg;
1834
1835 memset(&xpp, 0, sizeof(xpp));
1836 memset(&xecfg, 0, sizeof(xecfg));
1837 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1838 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
1839 &xpp, &xecfg);
1840 }
1841
1842 free_and_return:
1843 diff_free_filespec_data(one);
1844 diff_free_filespec_data(two);
1845 }
1846
1847 static void builtin_checkdiff(const char *name_a, const char *name_b,
1848 const char *attr_path,
1849 struct diff_filespec *one,
1850 struct diff_filespec *two,
1851 struct diff_options *o)
1852 {
1853 mmfile_t mf1, mf2;
1854 struct checkdiff_t data;
1855
1856 if (!two)
1857 return;
1858
1859 memset(&data, 0, sizeof(data));
1860 data.filename = name_b ? name_b : name_a;
1861 data.lineno = 0;
1862 data.o = o;
1863 data.ws_rule = whitespace_rule(attr_path);
1864 data.conflict_marker_size = ll_merge_marker_size(attr_path);
1865
1866 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1867 die("unable to read files to diff");
1868
1869 /*
1870 * All the other codepaths check both sides, but not checking
1871 * the "old" side here is deliberate. We are checking the newly
1872 * introduced changes, and as long as the "new" side is text, we
1873 * can and should check what it introduces.
1874 */
1875 if (diff_filespec_is_binary(two))
1876 goto free_and_return;
1877 else {
1878 /* Crazy xdl interfaces.. */
1879 xpparam_t xpp;
1880 xdemitconf_t xecfg;
1881
1882 memset(&xpp, 0, sizeof(xpp));
1883 memset(&xecfg, 0, sizeof(xecfg));
1884 xecfg.ctxlen = 1; /* at least one context line */
1885 xpp.flags = XDF_NEED_MINIMAL;
1886 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
1887 &xpp, &xecfg);
1888
1889 if (data.ws_rule & WS_BLANK_AT_EOF) {
1890 struct emit_callback ecbdata;
1891 int blank_at_eof;
1892
1893 ecbdata.ws_rule = data.ws_rule;
1894 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1895 blank_at_eof = ecbdata.blank_at_eof_in_preimage;
1896
1897 if (blank_at_eof) {
1898 static char *err;
1899 if (!err)
1900 err = whitespace_error_string(WS_BLANK_AT_EOF);
1901 fprintf(o->file, "%s:%d: %s.\n",
1902 data.filename, blank_at_eof, err);
1903 data.status = 1; /* report errors */
1904 }
1905 }
1906 }
1907 free_and_return:
1908 diff_free_filespec_data(one);
1909 diff_free_filespec_data(two);
1910 if (data.status)
1911 DIFF_OPT_SET(o, CHECK_FAILED);
1912 }
1913
1914 struct diff_filespec *alloc_filespec(const char *path)
1915 {
1916 int namelen = strlen(path);
1917 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1918
1919 memset(spec, 0, sizeof(*spec));
1920 spec->path = (char *)(spec + 1);
1921 memcpy(spec->path, path, namelen+1);
1922 spec->count = 1;
1923 spec->is_binary = -1;
1924 return spec;
1925 }
1926
1927 void free_filespec(struct diff_filespec *spec)
1928 {
1929 if (!--spec->count) {
1930 diff_free_filespec_data(spec);
1931 free(spec);
1932 }
1933 }
1934
1935 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1936 unsigned short mode)
1937 {
1938 if (mode) {
1939 spec->mode = canon_mode(mode);
1940 hashcpy(spec->sha1, sha1);
1941 spec->sha1_valid = !is_null_sha1(sha1);
1942 }
1943 }
1944
1945 /*
1946 * Given a name and sha1 pair, if the index tells us the file in
1947 * the work tree has that object contents, return true, so that
1948 * prepare_temp_file() does not have to inflate and extract.
1949 */
1950 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1951 {
1952 struct cache_entry *ce;
1953 struct stat st;
1954 int pos, len;
1955
1956 /*
1957 * We do not read the cache ourselves here, because the
1958 * benchmark with my previous version that always reads cache
1959 * shows that it makes things worse for diff-tree comparing
1960 * two linux-2.6 kernel trees in an already checked out work
1961 * tree. This is because most diff-tree comparisons deal with
1962 * only a small number of files, while reading the cache is
1963 * expensive for a large project, and its cost outweighs the
1964 * savings we get by not inflating the object to a temporary
1965 * file. Practically, this code only helps when we are used
1966 * by diff-cache --cached, which does read the cache before
1967 * calling us.
1968 */
1969 if (!active_cache)
1970 return 0;
1971
1972 /* We want to avoid the working directory if our caller
1973 * doesn't need the data in a normal file, this system
1974 * is rather slow with its stat/open/mmap/close syscalls,
1975 * and the object is contained in a pack file. The pack
1976 * is probably already open and will be faster to obtain
1977 * the data through than the working directory. Loose
1978 * objects however would tend to be slower as they need
1979 * to be individually opened and inflated.
1980 */
1981 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
1982 return 0;
1983
1984 len = strlen(name);
1985 pos = cache_name_pos(name, len);
1986 if (pos < 0)
1987 return 0;
1988 ce = active_cache[pos];
1989
1990 /*
1991 * This is not the sha1 we are looking for, or
1992 * unreusable because it is not a regular file.
1993 */
1994 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1995 return 0;
1996
1997 /*
1998 * If ce is marked as "assume unchanged", there is no
1999 * guarantee that work tree matches what we are looking for.
2000 */
2001 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2002 return 0;
2003
2004 /*
2005 * If ce matches the file in the work tree, we can reuse it.
2006 */
2007 if (ce_uptodate(ce) ||
2008 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2009 return 1;
2010
2011 return 0;
2012 }
2013
2014 static int populate_from_stdin(struct diff_filespec *s)
2015 {
2016 struct strbuf buf = STRBUF_INIT;
2017 size_t size = 0;
2018
2019 if (strbuf_read(&buf, 0, 0) < 0)
2020 return error("error while reading from stdin %s",
2021 strerror(errno));
2022
2023 s->should_munmap = 0;
2024 s->data = strbuf_detach(&buf, &size);
2025 s->size = size;
2026 s->should_free = 1;
2027 return 0;
2028 }
2029
2030 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2031 {
2032 int len;
2033 char *data = xmalloc(100), *dirty = "";
2034
2035 /* Are we looking at the work tree? */
2036 if (s->dirty_submodule)
2037 dirty = "-dirty";
2038
2039 len = snprintf(data, 100,
2040 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2041 s->data = data;
2042 s->size = len;
2043 s->should_free = 1;
2044 if (size_only) {
2045 s->data = NULL;
2046 free(data);
2047 }
2048 return 0;
2049 }
2050
2051 /*
2052 * While doing rename detection and pickaxe operation, we may need to
2053 * grab the data for the blob (or file) for our own in-core comparison.
2054 * diff_filespec has data and size fields for this purpose.
2055 */
2056 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2057 {
2058 int err = 0;
2059 if (!DIFF_FILE_VALID(s))
2060 die("internal error: asking to populate invalid file.");
2061 if (S_ISDIR(s->mode))
2062 return -1;
2063
2064 if (s->data)
2065 return 0;
2066
2067 if (size_only && 0 < s->size)
2068 return 0;
2069
2070 if (S_ISGITLINK(s->mode))
2071 return diff_populate_gitlink(s, size_only);
2072
2073 if (!s->sha1_valid ||
2074 reuse_worktree_file(s->path, s->sha1, 0)) {
2075 struct strbuf buf = STRBUF_INIT;
2076 struct stat st;
2077 int fd;
2078
2079 if (!strcmp(s->path, "-"))
2080 return populate_from_stdin(s);
2081
2082 if (lstat(s->path, &st) < 0) {
2083 if (errno == ENOENT) {
2084 err_empty:
2085 err = -1;
2086 empty:
2087 s->data = (char *)"";
2088 s->size = 0;
2089 return err;
2090 }
2091 }
2092 s->size = xsize_t(st.st_size);
2093 if (!s->size)
2094 goto empty;
2095 if (S_ISLNK(st.st_mode)) {
2096 struct strbuf sb = STRBUF_INIT;
2097
2098 if (strbuf_readlink(&sb, s->path, s->size))
2099 goto err_empty;
2100 s->size = sb.len;
2101 s->data = strbuf_detach(&sb, NULL);
2102 s->should_free = 1;
2103 return 0;
2104 }
2105 if (size_only)
2106 return 0;
2107 fd = open(s->path, O_RDONLY);
2108 if (fd < 0)
2109 goto err_empty;
2110 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2111 close(fd);
2112 s->should_munmap = 1;
2113
2114 /*
2115 * Convert from working tree format to canonical git format
2116 */
2117 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2118 size_t size = 0;
2119 munmap(s->data, s->size);
2120 s->should_munmap = 0;
2121 s->data = strbuf_detach(&buf, &size);
2122 s->size = size;
2123 s->should_free = 1;
2124 }
2125 }
2126 else {
2127 enum object_type type;
2128 if (size_only)
2129 type = sha1_object_info(s->sha1, &s->size);
2130 else {
2131 s->data = read_sha1_file(s->sha1, &type, &s->size);
2132 s->should_free = 1;
2133 }
2134 }
2135 return 0;
2136 }
2137
2138 void diff_free_filespec_blob(struct diff_filespec *s)
2139 {
2140 if (s->should_free)
2141 free(s->data);
2142 else if (s->should_munmap)
2143 munmap(s->data, s->size);
2144
2145 if (s->should_free || s->should_munmap) {
2146 s->should_free = s->should_munmap = 0;
2147 s->data = NULL;
2148 }
2149 }
2150
2151 void diff_free_filespec_data(struct diff_filespec *s)
2152 {
2153 diff_free_filespec_blob(s);
2154 free(s->cnt_data);
2155 s->cnt_data = NULL;
2156 }
2157
2158 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2159 void *blob,
2160 unsigned long size,
2161 const unsigned char *sha1,
2162 int mode)
2163 {
2164 int fd;
2165 struct strbuf buf = STRBUF_INIT;
2166 struct strbuf template = STRBUF_INIT;
2167 char *path_dup = xstrdup(path);
2168 const char *base = basename(path_dup);
2169
2170 /* Generate "XXXXXX_basename.ext" */
2171 strbuf_addstr(&template, "XXXXXX_");
2172 strbuf_addstr(&template, base);
2173
2174 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2175 strlen(base) + 1);
2176 if (fd < 0)
2177 die_errno("unable to create temp-file");
2178 if (convert_to_working_tree(path,
2179 (const char *)blob, (size_t)size, &buf)) {
2180 blob = buf.buf;
2181 size = buf.len;
2182 }
2183 if (write_in_full(fd, blob, size) != size)
2184 die_errno("unable to write temp-file");
2185 close(fd);
2186 temp->name = temp->tmp_path;
2187 strcpy(temp->hex, sha1_to_hex(sha1));
2188 temp->hex[40] = 0;
2189 sprintf(temp->mode, "%06o", mode);
2190 strbuf_release(&buf);
2191 strbuf_release(&template);
2192 free(path_dup);
2193 }
2194
2195 static struct diff_tempfile *prepare_temp_file(const char *name,
2196 struct diff_filespec *one)
2197 {
2198 struct diff_tempfile *temp = claim_diff_tempfile();
2199
2200 if (!DIFF_FILE_VALID(one)) {
2201 not_a_valid_file:
2202 /* A '-' entry produces this for file-2, and
2203 * a '+' entry produces this for file-1.
2204 */
2205 temp->name = "/dev/null";
2206 strcpy(temp->hex, ".");
2207 strcpy(temp->mode, ".");
2208 return temp;
2209 }
2210
2211 if (!remove_tempfile_installed) {
2212 atexit(remove_tempfile);
2213 sigchain_push_common(remove_tempfile_on_signal);
2214 remove_tempfile_installed = 1;
2215 }
2216
2217 if (!one->sha1_valid ||
2218 reuse_worktree_file(name, one->sha1, 1)) {
2219 struct stat st;
2220 if (lstat(name, &st) < 0) {
2221 if (errno == ENOENT)
2222 goto not_a_valid_file;
2223 die_errno("stat(%s)", name);
2224 }
2225 if (S_ISLNK(st.st_mode)) {
2226 struct strbuf sb = STRBUF_INIT;
2227 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2228 die_errno("readlink(%s)", name);
2229 prep_temp_blob(name, temp, sb.buf, sb.len,
2230 (one->sha1_valid ?
2231 one->sha1 : null_sha1),
2232 (one->sha1_valid ?
2233 one->mode : S_IFLNK));
2234 strbuf_release(&sb);
2235 }
2236 else {
2237 /* we can borrow from the file in the work tree */
2238 temp->name = name;
2239 if (!one->sha1_valid)
2240 strcpy(temp->hex, sha1_to_hex(null_sha1));
2241 else
2242 strcpy(temp->hex, sha1_to_hex(one->sha1));
2243 /* Even though we may sometimes borrow the
2244 * contents from the work tree, we always want
2245 * one->mode. mode is trustworthy even when
2246 * !(one->sha1_valid), as long as
2247 * DIFF_FILE_VALID(one).
2248 */
2249 sprintf(temp->mode, "%06o", one->mode);
2250 }
2251 return temp;
2252 }
2253 else {
2254 if (diff_populate_filespec(one, 0))
2255 die("cannot read data blob for %s", one->path);
2256 prep_temp_blob(name, temp, one->data, one->size,
2257 one->sha1, one->mode);
2258 }
2259 return temp;
2260 }
2261
2262 /* An external diff command takes:
2263 *
2264 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2265 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2266 *
2267 */
2268 static void run_external_diff(const char *pgm,
2269 const char *name,
2270 const char *other,
2271 struct diff_filespec *one,
2272 struct diff_filespec *two,
2273 const char *xfrm_msg,
2274 int complete_rewrite)
2275 {
2276 const char *spawn_arg[10];
2277 int retval;
2278 const char **arg = &spawn_arg[0];
2279
2280 if (one && two) {
2281 struct diff_tempfile *temp_one, *temp_two;
2282 const char *othername = (other ? other : name);
2283 temp_one = prepare_temp_file(name, one);
2284 temp_two = prepare_temp_file(othername, two);
2285 *arg++ = pgm;
2286 *arg++ = name;
2287 *arg++ = temp_one->name;
2288 *arg++ = temp_one->hex;
2289 *arg++ = temp_one->mode;
2290 *arg++ = temp_two->name;
2291 *arg++ = temp_two->hex;
2292 *arg++ = temp_two->mode;
2293 if (other) {
2294 *arg++ = other;
2295 *arg++ = xfrm_msg;
2296 }
2297 } else {
2298 *arg++ = pgm;
2299 *arg++ = name;
2300 }
2301 *arg = NULL;
2302 fflush(NULL);
2303 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2304 remove_tempfile();
2305 if (retval) {
2306 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2307 exit(1);
2308 }
2309 }
2310
2311 static int similarity_index(struct diff_filepair *p)
2312 {
2313 return p->score * 100 / MAX_SCORE;
2314 }
2315
2316 static void fill_metainfo(struct strbuf *msg,
2317 const char *name,
2318 const char *other,
2319 struct diff_filespec *one,
2320 struct diff_filespec *two,
2321 struct diff_options *o,
2322 struct diff_filepair *p)
2323 {
2324 strbuf_init(msg, PATH_MAX * 2 + 300);
2325 switch (p->status) {
2326 case DIFF_STATUS_COPIED:
2327 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2328 strbuf_addstr(msg, "\ncopy from ");
2329 quote_c_style(name, msg, NULL, 0);
2330 strbuf_addstr(msg, "\ncopy to ");
2331 quote_c_style(other, msg, NULL, 0);
2332 strbuf_addch(msg, '\n');
2333 break;
2334 case DIFF_STATUS_RENAMED:
2335 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2336 strbuf_addstr(msg, "\nrename from ");
2337 quote_c_style(name, msg, NULL, 0);
2338 strbuf_addstr(msg, "\nrename to ");
2339 quote_c_style(other, msg, NULL, 0);
2340 strbuf_addch(msg, '\n');
2341 break;
2342 case DIFF_STATUS_MODIFIED:
2343 if (p->score) {
2344 strbuf_addf(msg, "dissimilarity index %d%%\n",
2345 similarity_index(p));
2346 break;
2347 }
2348 /* fallthru */
2349 default:
2350 /* nothing */
2351 ;
2352 }
2353 if (one && two && hashcmp(one->sha1, two->sha1)) {
2354 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2355
2356 if (DIFF_OPT_TST(o, BINARY)) {
2357 mmfile_t mf;
2358 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2359 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2360 abbrev = 40;
2361 }
2362 strbuf_addf(msg, "index %.*s..%.*s",
2363 abbrev, sha1_to_hex(one->sha1),
2364 abbrev, sha1_to_hex(two->sha1));
2365 if (one->mode == two->mode)
2366 strbuf_addf(msg, " %06o", one->mode);
2367 strbuf_addch(msg, '\n');
2368 }
2369 if (msg->len)
2370 strbuf_setlen(msg, msg->len - 1);
2371 }
2372
2373 static void run_diff_cmd(const char *pgm,
2374 const char *name,
2375 const char *other,
2376 const char *attr_path,
2377 struct diff_filespec *one,
2378 struct diff_filespec *two,
2379 struct strbuf *msg,
2380 struct diff_options *o,
2381 struct diff_filepair *p)
2382 {
2383 const char *xfrm_msg = NULL;
2384 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2385
2386 if (msg) {
2387 fill_metainfo(msg, name, other, one, two, o, p);
2388 xfrm_msg = msg->len ? msg->buf : NULL;
2389 }
2390
2391 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2392 pgm = NULL;
2393 else {
2394 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2395 if (drv && drv->external)
2396 pgm = drv->external;
2397 }
2398
2399 if (pgm) {
2400 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2401 complete_rewrite);
2402 return;
2403 }
2404 if (one && two)
2405 builtin_diff(name, other ? other : name,
2406 one, two, xfrm_msg, o, complete_rewrite);
2407 else
2408 fprintf(o->file, "* Unmerged path %s\n", name);
2409 }
2410
2411 static void diff_fill_sha1_info(struct diff_filespec *one)
2412 {
2413 if (DIFF_FILE_VALID(one)) {
2414 if (!one->sha1_valid) {
2415 struct stat st;
2416 if (!strcmp(one->path, "-")) {
2417 hashcpy(one->sha1, null_sha1);
2418 return;
2419 }
2420 if (lstat(one->path, &st) < 0)
2421 die_errno("stat '%s'", one->path);
2422 if (index_path(one->sha1, one->path, &st, 0))
2423 die("cannot hash %s", one->path);
2424 }
2425 }
2426 else
2427 hashclr(one->sha1);
2428 }
2429
2430 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2431 {
2432 /* Strip the prefix but do not molest /dev/null and absolute paths */
2433 if (*namep && **namep != '/')
2434 *namep += prefix_length;
2435 if (*otherp && **otherp != '/')
2436 *otherp += prefix_length;
2437 }
2438
2439 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2440 {
2441 const char *pgm = external_diff();
2442 struct strbuf msg;
2443 struct diff_filespec *one = p->one;
2444 struct diff_filespec *two = p->two;
2445 const char *name;
2446 const char *other;
2447 const char *attr_path;
2448
2449 name = p->one->path;
2450 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2451 attr_path = name;
2452 if (o->prefix_length)
2453 strip_prefix(o->prefix_length, &name, &other);
2454
2455 if (DIFF_PAIR_UNMERGED(p)) {
2456 run_diff_cmd(pgm, name, NULL, attr_path,
2457 NULL, NULL, NULL, o, p);
2458 return;
2459 }
2460
2461 diff_fill_sha1_info(one);
2462 diff_fill_sha1_info(two);
2463
2464 if (!pgm &&
2465 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2466 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2467 /*
2468 * a filepair that changes between file and symlink
2469 * needs to be split into deletion and creation.
2470 */
2471 struct diff_filespec *null = alloc_filespec(two->path);
2472 run_diff_cmd(NULL, name, other, attr_path,
2473 one, null, &msg, o, p);
2474 free(null);
2475 strbuf_release(&msg);
2476
2477 null = alloc_filespec(one->path);
2478 run_diff_cmd(NULL, name, other, attr_path,
2479 null, two, &msg, o, p);
2480 free(null);
2481 }
2482 else
2483 run_diff_cmd(pgm, name, other, attr_path,
2484 one, two, &msg, o, p);
2485
2486 strbuf_release(&msg);
2487 }
2488
2489 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2490 struct diffstat_t *diffstat)
2491 {
2492 const char *name;
2493 const char *other;
2494 int complete_rewrite = 0;
2495
2496 if (DIFF_PAIR_UNMERGED(p)) {
2497 /* unmerged */
2498 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2499 return;
2500 }
2501
2502 name = p->one->path;
2503 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2504
2505 if (o->prefix_length)
2506 strip_prefix(o->prefix_length, &name, &other);
2507
2508 diff_fill_sha1_info(p->one);
2509 diff_fill_sha1_info(p->two);
2510
2511 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2512 complete_rewrite = 1;
2513 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2514 }
2515
2516 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2517 {
2518 const char *name;
2519 const char *other;
2520 const char *attr_path;
2521
2522 if (DIFF_PAIR_UNMERGED(p)) {
2523 /* unmerged */
2524 return;
2525 }
2526
2527 name = p->one->path;
2528 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2529 attr_path = other ? other : name;
2530
2531 if (o->prefix_length)
2532 strip_prefix(o->prefix_length, &name, &other);
2533
2534 diff_fill_sha1_info(p->one);
2535 diff_fill_sha1_info(p->two);
2536
2537 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2538 }
2539
2540 void diff_setup(struct diff_options *options)
2541 {
2542 memset(options, 0, sizeof(*options));
2543
2544 options->file = stdout;
2545
2546 options->line_termination = '\n';
2547 options->break_opt = -1;
2548 options->rename_limit = -1;
2549 options->dirstat_percent = 3;
2550 options->context = 3;
2551
2552 options->change = diff_change;
2553 options->add_remove = diff_addremove;
2554 if (diff_use_color_default > 0)
2555 DIFF_OPT_SET(options, COLOR_DIFF);
2556 options->detect_rename = diff_detect_rename_default;
2557
2558 if (!diff_mnemonic_prefix) {
2559 options->a_prefix = "a/";
2560 options->b_prefix = "b/";
2561 }
2562 }
2563
2564 int diff_setup_done(struct diff_options *options)
2565 {
2566 int count = 0;
2567
2568 if (options->output_format & DIFF_FORMAT_NAME)
2569 count++;
2570 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2571 count++;
2572 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2573 count++;
2574 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2575 count++;
2576 if (count > 1)
2577 die("--name-only, --name-status, --check and -s are mutually exclusive");
2578
2579 /*
2580 * Most of the time we can say "there are changes"
2581 * only by checking if there are changed paths, but
2582 * --ignore-whitespace* options force us to look
2583 * inside contents.
2584 */
2585
2586 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
2587 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
2588 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
2589 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
2590 else
2591 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
2592
2593 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2594 options->detect_rename = DIFF_DETECT_COPY;
2595
2596 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2597 options->prefix = NULL;
2598 if (options->prefix)
2599 options->prefix_length = strlen(options->prefix);
2600 else
2601 options->prefix_length = 0;
2602
2603 if (options->output_format & (DIFF_FORMAT_NAME |
2604 DIFF_FORMAT_NAME_STATUS |
2605 DIFF_FORMAT_CHECKDIFF |
2606 DIFF_FORMAT_NO_OUTPUT))
2607 options->output_format &= ~(DIFF_FORMAT_RAW |
2608 DIFF_FORMAT_NUMSTAT |
2609 DIFF_FORMAT_DIFFSTAT |
2610 DIFF_FORMAT_SHORTSTAT |
2611 DIFF_FORMAT_DIRSTAT |
2612 DIFF_FORMAT_SUMMARY |
2613 DIFF_FORMAT_PATCH);
2614
2615 /*
2616 * These cases always need recursive; we do not drop caller-supplied
2617 * recursive bits for other formats here.
2618 */
2619 if (options->output_format & (DIFF_FORMAT_PATCH |
2620 DIFF_FORMAT_NUMSTAT |
2621 DIFF_FORMAT_DIFFSTAT |
2622 DIFF_FORMAT_SHORTSTAT |
2623 DIFF_FORMAT_DIRSTAT |
2624 DIFF_FORMAT_SUMMARY |
2625 DIFF_FORMAT_CHECKDIFF))
2626 DIFF_OPT_SET(options, RECURSIVE);
2627 /*
2628 * Also pickaxe would not work very well if you do not say recursive
2629 */
2630 if (options->pickaxe)
2631 DIFF_OPT_SET(options, RECURSIVE);
2632 /*
2633 * When patches are generated, submodules diffed against the work tree
2634 * must be checked for dirtiness too so it can be shown in the output
2635 */
2636 if (options->output_format & DIFF_FORMAT_PATCH)
2637 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
2638
2639 if (options->detect_rename && options->rename_limit < 0)
2640 options->rename_limit = diff_rename_limit_default;
2641 if (options->setup & DIFF_SETUP_USE_CACHE) {
2642 if (!active_cache)
2643 /* read-cache does not die even when it fails
2644 * so it is safe for us to do this here. Also
2645 * it does not smudge active_cache or active_nr
2646 * when it fails, so we do not have to worry about
2647 * cleaning it up ourselves either.
2648 */
2649 read_cache();
2650 }
2651 if (options->abbrev <= 0 || 40 < options->abbrev)
2652 options->abbrev = 40; /* full */
2653
2654 /*
2655 * It does not make sense to show the first hit we happened
2656 * to have found. It does not make sense not to return with
2657 * exit code in such a case either.
2658 */
2659 if (DIFF_OPT_TST(options, QUICK)) {
2660 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2661 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2662 }
2663
2664 return 0;
2665 }
2666
2667 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2668 {
2669 char c, *eq;
2670 int len;
2671
2672 if (*arg != '-')
2673 return 0;
2674 c = *++arg;
2675 if (!c)
2676 return 0;
2677 if (c == arg_short) {
2678 c = *++arg;
2679 if (!c)
2680 return 1;
2681 if (val && isdigit(c)) {
2682 char *end;
2683 int n = strtoul(arg, &end, 10);
2684 if (*end)
2685 return 0;
2686 *val = n;
2687 return 1;
2688 }
2689 return 0;
2690 }
2691 if (c != '-')
2692 return 0;
2693 arg++;
2694 eq = strchr(arg, '=');
2695 if (eq)
2696 len = eq - arg;
2697 else
2698 len = strlen(arg);
2699 if (!len || strncmp(arg, arg_long, len))
2700 return 0;
2701 if (eq) {
2702 int n;
2703 char *end;
2704 if (!isdigit(*++eq))
2705 return 0;
2706 n = strtoul(eq, &end, 10);
2707 if (*end)
2708 return 0;
2709 *val = n;
2710 }
2711 return 1;
2712 }
2713
2714 static int diff_scoreopt_parse(const char *opt);
2715
2716 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2717 {
2718 const char *arg = av[0];
2719
2720 /* Output format options */
2721 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2722 options->output_format |= DIFF_FORMAT_PATCH;
2723 else if (opt_arg(arg, 'U', "unified", &options->context))
2724 options->output_format |= DIFF_FORMAT_PATCH;
2725 else if (!strcmp(arg, "--raw"))
2726 options->output_format |= DIFF_FORMAT_RAW;
2727 else if (!strcmp(arg, "--patch-with-raw"))
2728 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2729 else if (!strcmp(arg, "--numstat"))
2730 options->output_format |= DIFF_FORMAT_NUMSTAT;
2731 else if (!strcmp(arg, "--shortstat"))
2732 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2733 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2734 options->output_format |= DIFF_FORMAT_DIRSTAT;
2735 else if (!strcmp(arg, "--cumulative")) {
2736 options->output_format |= DIFF_FORMAT_DIRSTAT;
2737 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
2738 } else if (opt_arg(arg, 0, "dirstat-by-file",
2739 &options->dirstat_percent)) {
2740 options->output_format |= DIFF_FORMAT_DIRSTAT;
2741 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
2742 }
2743 else if (!strcmp(arg, "--check"))
2744 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2745 else if (!strcmp(arg, "--summary"))
2746 options->output_format |= DIFF_FORMAT_SUMMARY;
2747 else if (!strcmp(arg, "--patch-with-stat"))
2748 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2749 else if (!strcmp(arg, "--name-only"))
2750 options->output_format |= DIFF_FORMAT_NAME;
2751 else if (!strcmp(arg, "--name-status"))
2752 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2753 else if (!strcmp(arg, "-s"))
2754 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2755 else if (!prefixcmp(arg, "--stat")) {
2756 char *end;
2757 int width = options->stat_width;
2758 int name_width = options->stat_name_width;
2759 arg += 6;
2760 end = (char *)arg;
2761
2762 switch (*arg) {
2763 case '-':
2764 if (!prefixcmp(arg, "-width="))
2765 width = strtoul(arg + 7, &end, 10);
2766 else if (!prefixcmp(arg, "-name-width="))
2767 name_width = strtoul(arg + 12, &end, 10);
2768 break;
2769 case '=':
2770 width = strtoul(arg+1, &end, 10);
2771 if (*end == ',')
2772 name_width = strtoul(end+1, &end, 10);
2773 }
2774
2775 /* Important! This checks all the error cases! */
2776 if (*end)
2777 return 0;
2778 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2779 options->stat_name_width = name_width;
2780 options->stat_width = width;
2781 }
2782
2783 /* renames options */
2784 else if (!prefixcmp(arg, "-B")) {
2785 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2786 return -1;
2787 }
2788 else if (!prefixcmp(arg, "-M")) {
2789 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2790 return -1;
2791 options->detect_rename = DIFF_DETECT_RENAME;
2792 }
2793 else if (!prefixcmp(arg, "-C")) {
2794 if (options->detect_rename == DIFF_DETECT_COPY)
2795 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2796 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2797 return -1;
2798 options->detect_rename = DIFF_DETECT_COPY;
2799 }
2800 else if (!strcmp(arg, "--no-renames"))
2801 options->detect_rename = 0;
2802 else if (!strcmp(arg, "--relative"))
2803 DIFF_OPT_SET(options, RELATIVE_NAME);
2804 else if (!prefixcmp(arg, "--relative=")) {
2805 DIFF_OPT_SET(options, RELATIVE_NAME);
2806 options->prefix = arg + 11;
2807 }
2808
2809 /* xdiff options */
2810 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2811 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
2812 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2813 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
2814 else if (!strcmp(arg, "--ignore-space-at-eol"))
2815 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
2816 else if (!strcmp(arg, "--patience"))
2817 DIFF_XDL_SET(options, PATIENCE_DIFF);
2818
2819 /* flags options */
2820 else if (!strcmp(arg, "--binary")) {
2821 options->output_format |= DIFF_FORMAT_PATCH;
2822 DIFF_OPT_SET(options, BINARY);
2823 }
2824 else if (!strcmp(arg, "--full-index"))
2825 DIFF_OPT_SET(options, FULL_INDEX);
2826 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2827 DIFF_OPT_SET(options, TEXT);
2828 else if (!strcmp(arg, "-R"))
2829 DIFF_OPT_SET(options, REVERSE_DIFF);
2830 else if (!strcmp(arg, "--find-copies-harder"))
2831 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2832 else if (!strcmp(arg, "--follow"))
2833 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2834 else if (!strcmp(arg, "--color"))
2835 DIFF_OPT_SET(options, COLOR_DIFF);
2836 else if (!prefixcmp(arg, "--color=")) {
2837 int value = git_config_colorbool(NULL, arg+8, -1);
2838 if (value == 0)
2839 DIFF_OPT_CLR(options, COLOR_DIFF);
2840 else if (value > 0)
2841 DIFF_OPT_SET(options, COLOR_DIFF);
2842 else
2843 return error("option `color' expects \"always\", \"auto\", or \"never\"");
2844 }
2845 else if (!strcmp(arg, "--no-color"))
2846 DIFF_OPT_CLR(options, COLOR_DIFF);
2847 else if (!strcmp(arg, "--color-words")) {
2848 DIFF_OPT_SET(options, COLOR_DIFF);
2849 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2850 }
2851 else if (!prefixcmp(arg, "--color-words=")) {
2852 DIFF_OPT_SET(options, COLOR_DIFF);
2853 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2854 options->word_regex = arg + 14;
2855 }
2856 else if (!strcmp(arg, "--exit-code"))
2857 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2858 else if (!strcmp(arg, "--quiet"))
2859 DIFF_OPT_SET(options, QUICK);
2860 else if (!strcmp(arg, "--ext-diff"))
2861 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2862 else if (!strcmp(arg, "--no-ext-diff"))
2863 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2864 else if (!strcmp(arg, "--textconv"))
2865 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
2866 else if (!strcmp(arg, "--no-textconv"))
2867 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
2868 else if (!strcmp(arg, "--ignore-submodules"))
2869 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2870 else if (!strcmp(arg, "--submodule"))
2871 DIFF_OPT_SET(options, SUBMODULE_LOG);
2872 else if (!prefixcmp(arg, "--submodule=")) {
2873 if (!strcmp(arg + 12, "log"))
2874 DIFF_OPT_SET(options, SUBMODULE_LOG);
2875 }
2876
2877 /* misc options */
2878 else if (!strcmp(arg, "-z"))
2879 options->line_termination = 0;
2880 else if (!prefixcmp(arg, "-l"))
2881 options->rename_limit = strtoul(arg+2, NULL, 10);
2882 else if (!prefixcmp(arg, "-S"))
2883 options->pickaxe = arg + 2;
2884 else if (!strcmp(arg, "--pickaxe-all"))
2885 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2886 else if (!strcmp(arg, "--pickaxe-regex"))
2887 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2888 else if (!prefixcmp(arg, "-O"))
2889 options->orderfile = arg + 2;
2890 else if (!prefixcmp(arg, "--diff-filter="))
2891 options->filter = arg + 14;
2892 else if (!strcmp(arg, "--abbrev"))
2893 options->abbrev = DEFAULT_ABBREV;
2894 else if (!prefixcmp(arg, "--abbrev=")) {
2895 options->abbrev = strtoul(arg + 9, NULL, 10);
2896 if (options->abbrev < MINIMUM_ABBREV)
2897 options->abbrev = MINIMUM_ABBREV;
2898 else if (40 < options->abbrev)
2899 options->abbrev = 40;
2900 }
2901 else if (!prefixcmp(arg, "--src-prefix="))
2902 options->a_prefix = arg + 13;
2903 else if (!prefixcmp(arg, "--dst-prefix="))
2904 options->b_prefix = arg + 13;
2905 else if (!strcmp(arg, "--no-prefix"))
2906 options->a_prefix = options->b_prefix = "";
2907 else if (opt_arg(arg, '\0', "inter-hunk-context",
2908 &options->interhunkcontext))
2909 ;
2910 else if (!prefixcmp(arg, "--output=")) {
2911 options->file = fopen(arg + strlen("--output="), "w");
2912 if (!options->file)
2913 die_errno("Could not open '%s'", arg + strlen("--output="));
2914 options->close_file = 1;
2915 } else
2916 return 0;
2917 return 1;
2918 }
2919
2920 static int parse_num(const char **cp_p)
2921 {
2922 unsigned long num, scale;
2923 int ch, dot;
2924 const char *cp = *cp_p;
2925
2926 num = 0;
2927 scale = 1;
2928 dot = 0;
2929 for (;;) {
2930 ch = *cp;
2931 if ( !dot && ch == '.' ) {
2932 scale = 1;
2933 dot = 1;
2934 } else if ( ch == '%' ) {
2935 scale = dot ? scale*100 : 100;
2936 cp++; /* % is always at the end */
2937 break;
2938 } else if ( ch >= '0' && ch <= '9' ) {
2939 if ( scale < 100000 ) {
2940 scale *= 10;
2941 num = (num*10) + (ch-'0');
2942 }
2943 } else {
2944 break;
2945 }
2946 cp++;
2947 }
2948 *cp_p = cp;
2949
2950 /* user says num divided by scale and we say internally that
2951 * is MAX_SCORE * num / scale.
2952 */
2953 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2954 }
2955
2956 static int diff_scoreopt_parse(const char *opt)
2957 {
2958 int opt1, opt2, cmd;
2959
2960 if (*opt++ != '-')
2961 return -1;
2962 cmd = *opt++;
2963 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2964 return -1; /* that is not a -M, -C nor -B option */
2965
2966 opt1 = parse_num(&opt);
2967 if (cmd != 'B')
2968 opt2 = 0;
2969 else {
2970 if (*opt == 0)
2971 opt2 = 0;
2972 else if (*opt != '/')
2973 return -1; /* we expect -B80/99 or -B80 */
2974 else {
2975 opt++;
2976 opt2 = parse_num(&opt);
2977 }
2978 }
2979 if (*opt != 0)
2980 return -1;
2981 return opt1 | (opt2 << 16);
2982 }
2983
2984 struct diff_queue_struct diff_queued_diff;
2985
2986 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2987 {
2988 if (queue->alloc <= queue->nr) {
2989 queue->alloc = alloc_nr(queue->alloc);
2990 queue->queue = xrealloc(queue->queue,
2991 sizeof(dp) * queue->alloc);
2992 }
2993 queue->queue[queue->nr++] = dp;
2994 }
2995
2996 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2997 struct diff_filespec *one,
2998 struct diff_filespec *two)
2999 {
3000 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3001 dp->one = one;
3002 dp->two = two;
3003 if (queue)
3004 diff_q(queue, dp);
3005 return dp;
3006 }
3007
3008 void diff_free_filepair(struct diff_filepair *p)
3009 {
3010 free_filespec(p->one);
3011 free_filespec(p->two);
3012 free(p);
3013 }
3014
3015 /* This is different from find_unique_abbrev() in that
3016 * it stuffs the result with dots for alignment.
3017 */
3018 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3019 {
3020 int abblen;
3021 const char *abbrev;
3022 if (len == 40)
3023 return sha1_to_hex(sha1);
3024
3025 abbrev = find_unique_abbrev(sha1, len);
3026 abblen = strlen(abbrev);
3027 if (abblen < 37) {
3028 static char hex[41];
3029 if (len < abblen && abblen <= len + 2)
3030 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3031 else
3032 sprintf(hex, "%s...", abbrev);
3033 return hex;
3034 }
3035 return sha1_to_hex(sha1);
3036 }
3037
3038 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3039 {
3040 int line_termination = opt->line_termination;
3041 int inter_name_termination = line_termination ? '\t' : '\0';
3042
3043 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3044 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3045 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3046 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3047 }
3048 if (p->score) {
3049 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3050 inter_name_termination);
3051 } else {
3052 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3053 }
3054
3055 if (p->status == DIFF_STATUS_COPIED ||
3056 p->status == DIFF_STATUS_RENAMED) {
3057 const char *name_a, *name_b;
3058 name_a = p->one->path;
3059 name_b = p->two->path;
3060 strip_prefix(opt->prefix_length, &name_a, &name_b);
3061 write_name_quoted(name_a, opt->file, inter_name_termination);
3062 write_name_quoted(name_b, opt->file, line_termination);
3063 } else {
3064 const char *name_a, *name_b;
3065 name_a = p->one->mode ? p->one->path : p->two->path;
3066 name_b = NULL;
3067 strip_prefix(opt->prefix_length, &name_a, &name_b);
3068 write_name_quoted(name_a, opt->file, line_termination);
3069 }
3070 }
3071
3072 int diff_unmodified_pair(struct diff_filepair *p)
3073 {
3074 /* This function is written stricter than necessary to support
3075 * the currently implemented transformers, but the idea is to
3076 * let transformers to produce diff_filepairs any way they want,
3077 * and filter and clean them up here before producing the output.
3078 */
3079 struct diff_filespec *one = p->one, *two = p->two;
3080
3081 if (DIFF_PAIR_UNMERGED(p))
3082 return 0; /* unmerged is interesting */
3083
3084 /* deletion, addition, mode or type change
3085 * and rename are all interesting.
3086 */
3087 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3088 DIFF_PAIR_MODE_CHANGED(p) ||
3089 strcmp(one->path, two->path))
3090 return 0;
3091
3092 /* both are valid and point at the same path. that is, we are
3093 * dealing with a change.
3094 */
3095 if (one->sha1_valid && two->sha1_valid &&
3096 !hashcmp(one->sha1, two->sha1) &&
3097 !one->dirty_submodule && !two->dirty_submodule)
3098 return 1; /* no change */
3099 if (!one->sha1_valid && !two->sha1_valid)
3100 return 1; /* both look at the same file on the filesystem. */
3101 return 0;
3102 }
3103
3104 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3105 {
3106 if (diff_unmodified_pair(p))
3107 return;
3108
3109 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3110 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3111 return; /* no tree diffs in patch format */
3112
3113 run_diff(p, o);
3114 }
3115
3116 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3117 struct diffstat_t *diffstat)
3118 {
3119 if (diff_unmodified_pair(p))
3120 return;
3121
3122 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3123 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3124 return; /* no tree diffs in patch format */
3125
3126 run_diffstat(p, o, diffstat);
3127 }
3128
3129 static void diff_flush_checkdiff(struct diff_filepair *p,
3130 struct diff_options *o)
3131 {
3132 if (diff_unmodified_pair(p))
3133 return;
3134
3135 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3136 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3137 return; /* no tree diffs in patch format */
3138
3139 run_checkdiff(p, o);
3140 }
3141
3142 int diff_queue_is_empty(void)
3143 {
3144 struct diff_queue_struct *q = &diff_queued_diff;
3145 int i;
3146 for (i = 0; i < q->nr; i++)
3147 if (!diff_unmodified_pair(q->queue[i]))
3148 return 0;
3149 return 1;
3150 }
3151
3152 #if DIFF_DEBUG
3153 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3154 {
3155 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3156 x, one ? one : "",
3157 s->path,
3158 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3159 s->mode,
3160 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3161 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3162 x, one ? one : "",
3163 s->size, s->xfrm_flags);
3164 }
3165
3166 void diff_debug_filepair(const struct diff_filepair *p, int i)
3167 {
3168 diff_debug_filespec(p->one, i, "one");
3169 diff_debug_filespec(p->two, i, "two");
3170 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3171 p->score, p->status ? p->status : '?',
3172 p->one->rename_used, p->broken_pair);
3173 }
3174
3175 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3176 {
3177 int i;
3178 if (msg)
3179 fprintf(stderr, "%s\n", msg);
3180 fprintf(stderr, "q->nr = %d\n", q->nr);
3181 for (i = 0; i < q->nr; i++) {
3182 struct diff_filepair *p = q->queue[i];
3183 diff_debug_filepair(p, i);
3184 }
3185 }
3186 #endif
3187
3188 static void diff_resolve_rename_copy(void)
3189 {
3190 int i;
3191 struct diff_filepair *p;
3192 struct diff_queue_struct *q = &diff_queued_diff;
3193
3194 diff_debug_queue("resolve-rename-copy", q);
3195
3196 for (i = 0; i < q->nr; i++) {
3197 p = q->queue[i];
3198 p->status = 0; /* undecided */
3199 if (DIFF_PAIR_UNMERGED(p))
3200 p->status = DIFF_STATUS_UNMERGED;
3201 else if (!DIFF_FILE_VALID(p->one))
3202 p->status = DIFF_STATUS_ADDED;
3203 else if (!DIFF_FILE_VALID(p->two))
3204 p->status = DIFF_STATUS_DELETED;
3205 else if (DIFF_PAIR_TYPE_CHANGED(p))
3206 p->status = DIFF_STATUS_TYPE_CHANGED;
3207
3208 /* from this point on, we are dealing with a pair
3209 * whose both sides are valid and of the same type, i.e.
3210 * either in-place edit or rename/copy edit.
3211 */
3212 else if (DIFF_PAIR_RENAME(p)) {
3213 /*
3214 * A rename might have re-connected a broken
3215 * pair up, causing the pathnames to be the
3216 * same again. If so, that's not a rename at
3217 * all, just a modification..
3218 *
3219 * Otherwise, see if this source was used for
3220 * multiple renames, in which case we decrement
3221 * the count, and call it a copy.
3222 */
3223 if (!strcmp(p->one->path, p->two->path))
3224 p->status = DIFF_STATUS_MODIFIED;
3225 else if (--p->one->rename_used > 0)
3226 p->status = DIFF_STATUS_COPIED;
3227 else
3228 p->status = DIFF_STATUS_RENAMED;
3229 }
3230 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3231 p->one->mode != p->two->mode ||
3232 p->one->dirty_submodule ||
3233 p->two->dirty_submodule ||
3234 is_null_sha1(p->one->sha1))
3235 p->status = DIFF_STATUS_MODIFIED;
3236 else {
3237 /* This is a "no-change" entry and should not
3238 * happen anymore, but prepare for broken callers.
3239 */
3240 error("feeding unmodified %s to diffcore",
3241 p->one->path);
3242 p->status = DIFF_STATUS_UNKNOWN;
3243 }
3244 }
3245 diff_debug_queue("resolve-rename-copy done", q);
3246 }
3247
3248 static int check_pair_status(struct diff_filepair *p)
3249 {
3250 switch (p->status) {
3251 case DIFF_STATUS_UNKNOWN:
3252 return 0;
3253 case 0:
3254 die("internal error in diff-resolve-rename-copy");
3255 default:
3256 return 1;
3257 }
3258 }
3259
3260 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3261 {
3262 int fmt = opt->output_format;
3263
3264 if (fmt & DIFF_FORMAT_CHECKDIFF)
3265 diff_flush_checkdiff(p, opt);
3266 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3267 diff_flush_raw(p, opt);
3268 else if (fmt & DIFF_FORMAT_NAME) {
3269 const char *name_a, *name_b;
3270 name_a = p->two->path;
3271 name_b = NULL;
3272 strip_prefix(opt->prefix_length, &name_a, &name_b);
3273 write_name_quoted(name_a, opt->file, opt->line_termination);
3274 }
3275 }
3276
3277 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3278 {
3279 if (fs->mode)
3280 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3281 else
3282 fprintf(file, " %s ", newdelete);
3283 write_name_quoted(fs->path, file, '\n');
3284 }
3285
3286
3287 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
3288 {
3289 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3290 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
3291 show_name ? ' ' : '\n');
3292 if (show_name) {
3293 write_name_quoted(p->two->path, file, '\n');
3294 }
3295 }
3296 }
3297
3298 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
3299 {
3300 char *names = pprint_rename(p->one->path, p->two->path);
3301
3302 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3303 free(names);
3304 show_mode_change(file, p, 0);
3305 }
3306
3307 static void diff_summary(FILE *file, struct diff_filepair *p)
3308 {
3309 switch(p->status) {
3310 case DIFF_STATUS_DELETED:
3311 show_file_mode_name(file, "delete", p->one);
3312 break;
3313 case DIFF_STATUS_ADDED:
3314 show_file_mode_name(file, "create", p->two);
3315 break;
3316 case DIFF_STATUS_COPIED:
3317 show_rename_copy(file, "copy", p);
3318 break;
3319 case DIFF_STATUS_RENAMED:
3320 show_rename_copy(file, "rename", p);
3321 break;
3322 default:
3323 if (p->score) {
3324 fputs(" rewrite ", file);
3325 write_name_quoted(p->two->path, file, ' ');
3326 fprintf(file, "(%d%%)\n", similarity_index(p));
3327 }
3328 show_mode_change(file, p, !p->score);
3329 break;
3330 }
3331 }
3332
3333 struct patch_id_t {
3334 git_SHA_CTX *ctx;
3335 int patchlen;
3336 };
3337
3338 static int remove_space(char *line, int len)
3339 {
3340 int i;
3341 char *dst = line;
3342 unsigned char c;
3343
3344 for (i = 0; i < len; i++)
3345 if (!isspace((c = line[i])))
3346 *dst++ = c;
3347
3348 return dst - line;
3349 }
3350
3351 static void patch_id_consume(void *priv, char *line, unsigned long len)
3352 {
3353 struct patch_id_t *data = priv;
3354 int new_len;
3355
3356 /* Ignore line numbers when computing the SHA1 of the patch */
3357 if (!prefixcmp(line, "@@ -"))
3358 return;
3359
3360 new_len = remove_space(line, len);
3361
3362 git_SHA1_Update(data->ctx, line, new_len);
3363 data->patchlen += new_len;
3364 }
3365
3366 /* returns 0 upon success, and writes result into sha1 */
3367 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3368 {
3369 struct diff_queue_struct *q = &diff_queued_diff;
3370 int i;
3371 git_SHA_CTX ctx;
3372 struct patch_id_t data;
3373 char buffer[PATH_MAX * 4 + 20];
3374
3375 git_SHA1_Init(&ctx);
3376 memset(&data, 0, sizeof(struct patch_id_t));
3377 data.ctx = &ctx;
3378
3379 for (i = 0; i < q->nr; i++) {
3380 xpparam_t xpp;
3381 xdemitconf_t xecfg;
3382 mmfile_t mf1, mf2;
3383 struct diff_filepair *p = q->queue[i];
3384 int len1, len2;
3385
3386 memset(&xpp, 0, sizeof(xpp));
3387 memset(&xecfg, 0, sizeof(xecfg));
3388 if (p->status == 0)
3389 return error("internal diff status error");
3390 if (p->status == DIFF_STATUS_UNKNOWN)
3391 continue;
3392 if (diff_unmodified_pair(p))
3393 continue;
3394 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3395 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3396 continue;
3397 if (DIFF_PAIR_UNMERGED(p))
3398 continue;
3399
3400 diff_fill_sha1_info(p->one);
3401 diff_fill_sha1_info(p->two);
3402 if (fill_mmfile(&mf1, p->one) < 0 ||
3403 fill_mmfile(&mf2, p->two) < 0)
3404 return error("unable to read files to diff");
3405
3406 len1 = remove_space(p->one->path, strlen(p->one->path));
3407 len2 = remove_space(p->two->path, strlen(p->two->path));
3408 if (p->one->mode == 0)
3409 len1 = snprintf(buffer, sizeof(buffer),
3410 "diff--gita/%.*sb/%.*s"
3411 "newfilemode%06o"
3412 "---/dev/null"
3413 "+++b/%.*s",
3414 len1, p->one->path,
3415 len2, p->two->path,
3416 p->two->mode,
3417 len2, p->two->path);
3418 else if (p->two->mode == 0)
3419 len1 = snprintf(buffer, sizeof(buffer),
3420 "diff--gita/%.*sb/%.*s"
3421 "deletedfilemode%06o"
3422 "---a/%.*s"
3423 "+++/dev/null",
3424 len1, p->one->path,
3425 len2, p->two->path,
3426 p->one->mode,
3427 len1, p->one->path);
3428 else
3429 len1 = snprintf(buffer, sizeof(buffer),
3430 "diff--gita/%.*sb/%.*s"
3431 "---a/%.*s"
3432 "+++b/%.*s",
3433 len1, p->one->path,
3434 len2, p->two->path,
3435 len1, p->one->path,
3436 len2, p->two->path);
3437 git_SHA1_Update(&ctx, buffer, len1);
3438
3439 xpp.flags = XDF_NEED_MINIMAL;
3440 xecfg.ctxlen = 3;
3441 xecfg.flags = XDL_EMIT_FUNCNAMES;
3442 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3443 &xpp, &xecfg);
3444 }
3445
3446 git_SHA1_Final(sha1, &ctx);
3447 return 0;
3448 }
3449
3450 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3451 {
3452 struct diff_queue_struct *q = &diff_queued_diff;
3453 int i;
3454 int result = diff_get_patch_id(options, sha1);
3455
3456 for (i = 0; i < q->nr; i++)
3457 diff_free_filepair(q->queue[i]);
3458
3459 free(q->queue);
3460 q->queue = NULL;
3461 q->nr = q->alloc = 0;
3462
3463 return result;
3464 }
3465
3466 static int is_summary_empty(const struct diff_queue_struct *q)
3467 {
3468 int i;
3469
3470 for (i = 0; i < q->nr; i++) {
3471 const struct diff_filepair *p = q->queue[i];
3472
3473 switch (p->status) {
3474 case DIFF_STATUS_DELETED:
3475 case DIFF_STATUS_ADDED:
3476 case DIFF_STATUS_COPIED:
3477 case DIFF_STATUS_RENAMED:
3478 return 0;
3479 default:
3480 if (p->score)
3481 return 0;
3482 if (p->one->mode && p->two->mode &&
3483 p->one->mode != p->two->mode)
3484 return 0;
3485 break;
3486 }
3487 }
3488 return 1;
3489 }
3490
3491 void diff_flush(struct diff_options *options)
3492 {
3493 struct diff_queue_struct *q = &diff_queued_diff;
3494 int i, output_format = options->output_format;
3495 int separator = 0;
3496
3497 /*
3498 * Order: raw, stat, summary, patch
3499 * or: name/name-status/checkdiff (other bits clear)
3500 */
3501 if (!q->nr)
3502 goto free_queue;
3503
3504 if (output_format & (DIFF_FORMAT_RAW |
3505 DIFF_FORMAT_NAME |
3506 DIFF_FORMAT_NAME_STATUS |
3507 DIFF_FORMAT_CHECKDIFF)) {
3508 for (i = 0; i < q->nr; i++) {
3509 struct diff_filepair *p = q->queue[i];
3510 if (check_pair_status(p))
3511 flush_one_pair(p, options);
3512 }
3513 separator++;
3514 }
3515
3516 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3517 struct diffstat_t diffstat;
3518
3519 memset(&diffstat, 0, sizeof(struct diffstat_t));
3520 for (i = 0; i < q->nr; i++) {
3521 struct diff_filepair *p = q->queue[i];
3522 if (check_pair_status(p))
3523 diff_flush_stat(p, options, &diffstat);
3524 }
3525 if (output_format & DIFF_FORMAT_NUMSTAT)
3526 show_numstat(&diffstat, options);
3527 if (output_format & DIFF_FORMAT_DIFFSTAT)
3528 show_stats(&diffstat, options);
3529 if (output_format & DIFF_FORMAT_SHORTSTAT)
3530 show_shortstats(&diffstat, options);
3531 free_diffstat_info(&diffstat);
3532 separator++;
3533 }
3534 if (output_format & DIFF_FORMAT_DIRSTAT)
3535 show_dirstat(options);
3536
3537 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3538 for (i = 0; i < q->nr; i++)
3539 diff_summary(options->file, q->queue[i]);
3540 separator++;
3541 }
3542
3543 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
3544 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
3545 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
3546 /*
3547 * run diff_flush_patch for the exit status. setting
3548 * options->file to /dev/null should be safe, becaue we
3549 * aren't supposed to produce any output anyway.
3550 */
3551 if (options->close_file)
3552 fclose(options->file);
3553 options->file = fopen("/dev/null", "w");
3554 if (!options->file)
3555 die_errno("Could not open /dev/null");
3556 options->close_file = 1;
3557 for (i = 0; i < q->nr; i++) {
3558 struct diff_filepair *p = q->queue[i];
3559 if (check_pair_status(p))
3560 diff_flush_patch(p, options);
3561 if (options->found_changes)
3562 break;
3563 }
3564 }
3565
3566 if (output_format & DIFF_FORMAT_PATCH) {
3567 if (separator) {
3568 putc(options->line_termination, options->file);
3569 if (options->stat_sep) {
3570 /* attach patch instead of inline */
3571 fputs(options->stat_sep, options->file);
3572 }
3573 }
3574
3575 for (i = 0; i < q->nr; i++) {
3576 struct diff_filepair *p = q->queue[i];
3577 if (check_pair_status(p))
3578 diff_flush_patch(p, options);
3579 }
3580 }
3581
3582 if (output_format & DIFF_FORMAT_CALLBACK)
3583 options->format_callback(q, options, options->format_callback_data);
3584
3585 for (i = 0; i < q->nr; i++)
3586 diff_free_filepair(q->queue[i]);
3587 free_queue:
3588 free(q->queue);
3589 q->queue = NULL;
3590 q->nr = q->alloc = 0;
3591 if (options->close_file)
3592 fclose(options->file);
3593
3594 /*
3595 * Report the content-level differences with HAS_CHANGES;
3596 * diff_addremove/diff_change does not set the bit when
3597 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
3598 */
3599 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
3600 if (options->found_changes)
3601 DIFF_OPT_SET(options, HAS_CHANGES);
3602 else
3603 DIFF_OPT_CLR(options, HAS_CHANGES);
3604 }
3605 }
3606
3607 static void diffcore_apply_filter(const char *filter)
3608 {
3609 int i;
3610 struct diff_queue_struct *q = &diff_queued_diff;
3611 struct diff_queue_struct outq;
3612 outq.queue = NULL;
3613 outq.nr = outq.alloc = 0;
3614
3615 if (!filter)
3616 return;
3617
3618 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3619 int found;
3620 for (i = found = 0; !found && i < q->nr; i++) {
3621 struct diff_filepair *p = q->queue[i];
3622 if (((p->status == DIFF_STATUS_MODIFIED) &&
3623 ((p->score &&
3624 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3625 (!p->score &&
3626 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3627 ((p->status != DIFF_STATUS_MODIFIED) &&
3628 strchr(filter, p->status)))
3629 found++;
3630 }
3631 if (found)
3632 return;
3633
3634 /* otherwise we will clear the whole queue
3635 * by copying the empty outq at the end of this
3636 * function, but first clear the current entries
3637 * in the queue.
3638 */
3639 for (i = 0; i < q->nr; i++)
3640 diff_free_filepair(q->queue[i]);
3641 }
3642 else {
3643 /* Only the matching ones */
3644 for (i = 0; i < q->nr; i++) {
3645 struct diff_filepair *p = q->queue[i];
3646
3647 if (((p->status == DIFF_STATUS_MODIFIED) &&
3648 ((p->score &&
3649 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3650 (!p->score &&
3651 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3652 ((p->status != DIFF_STATUS_MODIFIED) &&
3653 strchr(filter, p->status)))
3654 diff_q(&outq, p);
3655 else
3656 diff_free_filepair(p);
3657 }
3658 }
3659 free(q->queue);
3660 *q = outq;
3661 }
3662
3663 /* Check whether two filespecs with the same mode and size are identical */
3664 static int diff_filespec_is_identical(struct diff_filespec *one,
3665 struct diff_filespec *two)
3666 {
3667 if (S_ISGITLINK(one->mode))
3668 return 0;
3669 if (diff_populate_filespec(one, 0))
3670 return 0;
3671 if (diff_populate_filespec(two, 0))
3672 return 0;
3673 return !memcmp(one->data, two->data, one->size);
3674 }
3675
3676 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3677 {
3678 int i;
3679 struct diff_queue_struct *q = &diff_queued_diff;
3680 struct diff_queue_struct outq;
3681 outq.queue = NULL;
3682 outq.nr = outq.alloc = 0;
3683
3684 for (i = 0; i < q->nr; i++) {
3685 struct diff_filepair *p = q->queue[i];
3686
3687 /*
3688 * 1. Entries that come from stat info dirtiness
3689 * always have both sides (iow, not create/delete),
3690 * one side of the object name is unknown, with
3691 * the same mode and size. Keep the ones that
3692 * do not match these criteria. They have real
3693 * differences.
3694 *
3695 * 2. At this point, the file is known to be modified,
3696 * with the same mode and size, and the object
3697 * name of one side is unknown. Need to inspect
3698 * the identical contents.
3699 */
3700 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3701 !DIFF_FILE_VALID(p->two) ||
3702 (p->one->sha1_valid && p->two->sha1_valid) ||
3703 (p->one->mode != p->two->mode) ||
3704 diff_populate_filespec(p->one, 1) ||
3705 diff_populate_filespec(p->two, 1) ||
3706 (p->one->size != p->two->size) ||
3707 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3708 diff_q(&outq, p);
3709 else {
3710 /*
3711 * The caller can subtract 1 from skip_stat_unmatch
3712 * to determine how many paths were dirty only
3713 * due to stat info mismatch.
3714 */
3715 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3716 diffopt->skip_stat_unmatch++;
3717 diff_free_filepair(p);
3718 }
3719 }
3720 free(q->queue);
3721 *q = outq;
3722 }
3723
3724 static int diffnamecmp(const void *a_, const void *b_)
3725 {
3726 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
3727 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
3728 const char *name_a, *name_b;
3729
3730 name_a = a->one ? a->one->path : a->two->path;
3731 name_b = b->one ? b->one->path : b->two->path;
3732 return strcmp(name_a, name_b);
3733 }
3734
3735 void diffcore_fix_diff_index(struct diff_options *options)
3736 {
3737 struct diff_queue_struct *q = &diff_queued_diff;
3738 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
3739 }
3740
3741 void diffcore_std(struct diff_options *options)
3742 {
3743 if (options->skip_stat_unmatch)
3744 diffcore_skip_stat_unmatch(options);
3745 if (options->break_opt != -1)
3746 diffcore_break(options->break_opt);
3747 if (options->detect_rename)
3748 diffcore_rename(options);
3749 if (options->break_opt != -1)
3750 diffcore_merge_broken();
3751 if (options->pickaxe)
3752 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3753 if (options->orderfile)
3754 diffcore_order(options->orderfile);
3755 diff_resolve_rename_copy();
3756 diffcore_apply_filter(options->filter);
3757
3758 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
3759 DIFF_OPT_SET(options, HAS_CHANGES);
3760 else
3761 DIFF_OPT_CLR(options, HAS_CHANGES);
3762 }
3763
3764 int diff_result_code(struct diff_options *opt, int status)
3765 {
3766 int result = 0;
3767 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3768 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3769 return status;
3770 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3771 DIFF_OPT_TST(opt, HAS_CHANGES))
3772 result |= 01;
3773 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3774 DIFF_OPT_TST(opt, CHECK_FAILED))
3775 result |= 02;
3776 return result;
3777 }
3778
3779 void diff_addremove(struct diff_options *options,
3780 int addremove, unsigned mode,
3781 const unsigned char *sha1,
3782 const char *concatpath, unsigned dirty_submodule)
3783 {
3784 struct diff_filespec *one, *two;
3785
3786 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3787 return;
3788
3789 /* This may look odd, but it is a preparation for
3790 * feeding "there are unchanged files which should
3791 * not produce diffs, but when you are doing copy
3792 * detection you would need them, so here they are"
3793 * entries to the diff-core. They will be prefixed
3794 * with something like '=' or '*' (I haven't decided
3795 * which but should not make any difference).
3796 * Feeding the same new and old to diff_change()
3797 * also has the same effect.
3798 * Before the final output happens, they are pruned after
3799 * merged into rename/copy pairs as appropriate.
3800 */
3801 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3802 addremove = (addremove == '+' ? '-' :
3803 addremove == '-' ? '+' : addremove);
3804
3805 if (options->prefix &&
3806 strncmp(concatpath, options->prefix, options->prefix_length))
3807 return;
3808
3809 one = alloc_filespec(concatpath);
3810 two = alloc_filespec(concatpath);
3811
3812 if (addremove != '+')
3813 fill_filespec(one, sha1, mode);
3814 if (addremove != '-') {
3815 fill_filespec(two, sha1, mode);
3816 two->dirty_submodule = dirty_submodule;
3817 }
3818
3819 diff_queue(&diff_queued_diff, one, two);
3820 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
3821 DIFF_OPT_SET(options, HAS_CHANGES);
3822 }
3823
3824 void diff_change(struct diff_options *options,
3825 unsigned old_mode, unsigned new_mode,
3826 const unsigned char *old_sha1,
3827 const unsigned char *new_sha1,
3828 const char *concatpath,
3829 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
3830 {
3831 struct diff_filespec *one, *two;
3832
3833 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3834 && S_ISGITLINK(new_mode))
3835 return;
3836
3837 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3838 unsigned tmp;
3839 const unsigned char *tmp_c;
3840 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3841 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3842 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
3843 new_dirty_submodule = tmp;
3844 }
3845
3846 if (options->prefix &&
3847 strncmp(concatpath, options->prefix, options->prefix_length))
3848 return;
3849
3850 one = alloc_filespec(concatpath);
3851 two = alloc_filespec(concatpath);
3852 fill_filespec(one, old_sha1, old_mode);
3853 fill_filespec(two, new_sha1, new_mode);
3854 one->dirty_submodule = old_dirty_submodule;
3855 two->dirty_submodule = new_dirty_submodule;
3856
3857 diff_queue(&diff_queued_diff, one, two);
3858 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
3859 DIFF_OPT_SET(options, HAS_CHANGES);
3860 }
3861
3862 void diff_unmerge(struct diff_options *options,
3863 const char *path,
3864 unsigned mode, const unsigned char *sha1)
3865 {
3866 struct diff_filespec *one, *two;
3867
3868 if (options->prefix &&
3869 strncmp(path, options->prefix, options->prefix_length))
3870 return;
3871
3872 one = alloc_filespec(path);
3873 two = alloc_filespec(path);
3874 fill_filespec(one, sha1, mode);
3875 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3876 }
3877
3878 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
3879 size_t *outsize)
3880 {
3881 struct diff_tempfile *temp;
3882 const char *argv[3];
3883 const char **arg = argv;
3884 struct child_process child;
3885 struct strbuf buf = STRBUF_INIT;
3886 int err = 0;
3887
3888 temp = prepare_temp_file(spec->path, spec);
3889 *arg++ = pgm;
3890 *arg++ = temp->name;
3891 *arg = NULL;
3892
3893 memset(&child, 0, sizeof(child));
3894 child.use_shell = 1;
3895 child.argv = argv;
3896 child.out = -1;
3897 if (start_command(&child)) {
3898 remove_tempfile();
3899 return NULL;
3900 }
3901
3902 if (strbuf_read(&buf, child.out, 0) < 0)
3903 err = error("error reading from textconv command '%s'", pgm);
3904 close(child.out);
3905
3906 if (finish_command(&child) || err) {
3907 strbuf_release(&buf);
3908 remove_tempfile();
3909 return NULL;
3910 }
3911 remove_tempfile();
3912
3913 return strbuf_detach(&buf, outsize);
3914 }
git with Jakub Narębski modifications