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Merge branch 'jk/diff-algo-finishing-touches'
[git/gitweb.git] / diff.c
blob649ec86b87c4eb201f9e587a0173e381e9b5b8b5
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 #include "string-list.h"
19
20 #ifdef NO_FAST_WORKING_DIRECTORY
21 #define FAST_WORKING_DIRECTORY 0
22 #else
23 #define FAST_WORKING_DIRECTORY 1
24 #endif
25
26 static int diff_detect_rename_default;
27 static int diff_rename_limit_default = 400;
28 static int diff_suppress_blank_empty;
29 static int diff_use_color_default = -1;
30 static int diff_context_default = 3;
31 static const char *diff_word_regex_cfg;
32 static const char *external_diff_cmd_cfg;
33 int diff_auto_refresh_index = 1;
34 static int diff_mnemonic_prefix;
35 static int diff_no_prefix;
36 static int diff_stat_graph_width;
37 static int diff_dirstat_permille_default = 30;
38 static struct diff_options default_diff_options;
39 static long diff_algorithm;
40
41 static char diff_colors[][COLOR_MAXLEN] = {
42 GIT_COLOR_RESET,
43 GIT_COLOR_NORMAL, /* PLAIN */
44 GIT_COLOR_BOLD, /* METAINFO */
45 GIT_COLOR_CYAN, /* FRAGINFO */
46 GIT_COLOR_RED, /* OLD */
47 GIT_COLOR_GREEN, /* NEW */
48 GIT_COLOR_YELLOW, /* COMMIT */
49 GIT_COLOR_BG_RED, /* WHITESPACE */
50 GIT_COLOR_NORMAL, /* FUNCINFO */
51 };
52
53 static int parse_diff_color_slot(const char *var, int ofs)
54 {
55 if (!strcasecmp(var+ofs, "plain"))
56 return DIFF_PLAIN;
57 if (!strcasecmp(var+ofs, "meta"))
58 return DIFF_METAINFO;
59 if (!strcasecmp(var+ofs, "frag"))
60 return DIFF_FRAGINFO;
61 if (!strcasecmp(var+ofs, "old"))
62 return DIFF_FILE_OLD;
63 if (!strcasecmp(var+ofs, "new"))
64 return DIFF_FILE_NEW;
65 if (!strcasecmp(var+ofs, "commit"))
66 return DIFF_COMMIT;
67 if (!strcasecmp(var+ofs, "whitespace"))
68 return DIFF_WHITESPACE;
69 if (!strcasecmp(var+ofs, "func"))
70 return DIFF_FUNCINFO;
71 return -1;
72 }
73
74 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
75 struct strbuf *errmsg)
76 {
77 char *params_copy = xstrdup(params_string);
78 struct string_list params = STRING_LIST_INIT_NODUP;
79 int ret = 0;
80 int i;
81
82 if (*params_copy)
83 string_list_split_in_place(&params, params_copy, ',', -1);
84 for (i = 0; i < params.nr; i++) {
85 const char *p = params.items[i].string;
86 if (!strcmp(p, "changes")) {
87 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
88 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
89 } else if (!strcmp(p, "lines")) {
90 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
91 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
92 } else if (!strcmp(p, "files")) {
93 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
94 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
95 } else if (!strcmp(p, "noncumulative")) {
96 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
97 } else if (!strcmp(p, "cumulative")) {
98 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
99 } else if (isdigit(*p)) {
100 char *end;
101 int permille = strtoul(p, &end, 10) * 10;
102 if (*end == '.' && isdigit(*++end)) {
103 /* only use first digit */
104 permille += *end - '0';
105 /* .. and ignore any further digits */
106 while (isdigit(*++end))
107 ; /* nothing */
108 }
109 if (!*end)
110 options->dirstat_permille = permille;
111 else {
112 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
113 p);
114 ret++;
115 }
116 } else {
117 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
118 ret++;
119 }
120
121 }
122 string_list_clear(&params, 0);
123 free(params_copy);
124 return ret;
125 }
126
127 static int parse_submodule_params(struct diff_options *options, const char *value)
128 {
129 if (!strcmp(value, "log"))
130 DIFF_OPT_SET(options, SUBMODULE_LOG);
131 else if (!strcmp(value, "short"))
132 DIFF_OPT_CLR(options, SUBMODULE_LOG);
133 else
134 return -1;
135 return 0;
136 }
137
138 static int git_config_rename(const char *var, const char *value)
139 {
140 if (!value)
141 return DIFF_DETECT_RENAME;
142 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
143 return DIFF_DETECT_COPY;
144 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
145 }
146
147 long parse_algorithm_value(const char *value)
148 {
149 if (!value)
150 return -1;
151 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
152 return 0;
153 else if (!strcasecmp(value, "minimal"))
154 return XDF_NEED_MINIMAL;
155 else if (!strcasecmp(value, "patience"))
156 return XDF_PATIENCE_DIFF;
157 else if (!strcasecmp(value, "histogram"))
158 return XDF_HISTOGRAM_DIFF;
159 return -1;
160 }
161
162 /*
163 * These are to give UI layer defaults.
164 * The core-level commands such as git-diff-files should
165 * never be affected by the setting of diff.renames
166 * the user happens to have in the configuration file.
167 */
168 int git_diff_ui_config(const char *var, const char *value, void *cb)
169 {
170 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
171 diff_use_color_default = git_config_colorbool(var, value);
172 return 0;
173 }
174 if (!strcmp(var, "diff.context")) {
175 diff_context_default = git_config_int(var, value);
176 if (diff_context_default < 0)
177 return -1;
178 return 0;
179 }
180 if (!strcmp(var, "diff.renames")) {
181 diff_detect_rename_default = git_config_rename(var, value);
182 return 0;
183 }
184 if (!strcmp(var, "diff.autorefreshindex")) {
185 diff_auto_refresh_index = git_config_bool(var, value);
186 return 0;
187 }
188 if (!strcmp(var, "diff.mnemonicprefix")) {
189 diff_mnemonic_prefix = git_config_bool(var, value);
190 return 0;
191 }
192 if (!strcmp(var, "diff.noprefix")) {
193 diff_no_prefix = git_config_bool(var, value);
194 return 0;
195 }
196 if (!strcmp(var, "diff.statgraphwidth")) {
197 diff_stat_graph_width = git_config_int(var, value);
198 return 0;
199 }
200 if (!strcmp(var, "diff.external"))
201 return git_config_string(&external_diff_cmd_cfg, var, value);
202 if (!strcmp(var, "diff.wordregex"))
203 return git_config_string(&diff_word_regex_cfg, var, value);
204
205 if (!strcmp(var, "diff.ignoresubmodules"))
206 handle_ignore_submodules_arg(&default_diff_options, value);
207
208 if (!strcmp(var, "diff.submodule")) {
209 if (parse_submodule_params(&default_diff_options, value))
210 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
211 value);
212 return 0;
213 }
214
215 if (!strcmp(var, "diff.algorithm")) {
216 diff_algorithm = parse_algorithm_value(value);
217 if (diff_algorithm < 0)
218 return -1;
219 return 0;
220 }
221
222 if (git_color_config(var, value, cb) < 0)
223 return -1;
224
225 return git_diff_basic_config(var, value, cb);
226 }
227
228 int git_diff_basic_config(const char *var, const char *value, void *cb)
229 {
230 if (!strcmp(var, "diff.renamelimit")) {
231 diff_rename_limit_default = git_config_int(var, value);
232 return 0;
233 }
234
235 if (userdiff_config(var, value) < 0)
236 return -1;
237
238 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
239 int slot = parse_diff_color_slot(var, 11);
240 if (slot < 0)
241 return 0;
242 if (!value)
243 return config_error_nonbool(var);
244 color_parse(value, var, diff_colors[slot]);
245 return 0;
246 }
247
248 /* like GNU diff's --suppress-blank-empty option */
249 if (!strcmp(var, "diff.suppressblankempty") ||
250 /* for backwards compatibility */
251 !strcmp(var, "diff.suppress-blank-empty")) {
252 diff_suppress_blank_empty = git_config_bool(var, value);
253 return 0;
254 }
255
256 if (!strcmp(var, "diff.dirstat")) {
257 struct strbuf errmsg = STRBUF_INIT;
258 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
259 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
260 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
261 errmsg.buf);
262 strbuf_release(&errmsg);
263 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
264 return 0;
265 }
266
267 if (!prefixcmp(var, "submodule."))
268 return parse_submodule_config_option(var, value);
269
270 return git_default_config(var, value, cb);
271 }
272
273 static char *quote_two(const char *one, const char *two)
274 {
275 int need_one = quote_c_style(one, NULL, NULL, 1);
276 int need_two = quote_c_style(two, NULL, NULL, 1);
277 struct strbuf res = STRBUF_INIT;
278
279 if (need_one + need_two) {
280 strbuf_addch(&res, '"');
281 quote_c_style(one, &res, NULL, 1);
282 quote_c_style(two, &res, NULL, 1);
283 strbuf_addch(&res, '"');
284 } else {
285 strbuf_addstr(&res, one);
286 strbuf_addstr(&res, two);
287 }
288 return strbuf_detach(&res, NULL);
289 }
290
291 static const char *external_diff(void)
292 {
293 static const char *external_diff_cmd = NULL;
294 static int done_preparing = 0;
295
296 if (done_preparing)
297 return external_diff_cmd;
298 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
299 if (!external_diff_cmd)
300 external_diff_cmd = external_diff_cmd_cfg;
301 done_preparing = 1;
302 return external_diff_cmd;
303 }
304
305 static struct diff_tempfile {
306 const char *name; /* filename external diff should read from */
307 char hex[41];
308 char mode[10];
309 char tmp_path[PATH_MAX];
310 } diff_temp[2];
311
312 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
313
314 struct emit_callback {
315 int color_diff;
316 unsigned ws_rule;
317 int blank_at_eof_in_preimage;
318 int blank_at_eof_in_postimage;
319 int lno_in_preimage;
320 int lno_in_postimage;
321 sane_truncate_fn truncate;
322 const char **label_path;
323 struct diff_words_data *diff_words;
324 struct diff_options *opt;
325 int *found_changesp;
326 struct strbuf *header;
327 };
328
329 static int count_lines(const char *data, int size)
330 {
331 int count, ch, completely_empty = 1, nl_just_seen = 0;
332 count = 0;
333 while (0 < size--) {
334 ch = *data++;
335 if (ch == '\n') {
336 count++;
337 nl_just_seen = 1;
338 completely_empty = 0;
339 }
340 else {
341 nl_just_seen = 0;
342 completely_empty = 0;
343 }
344 }
345 if (completely_empty)
346 return 0;
347 if (!nl_just_seen)
348 count++; /* no trailing newline */
349 return count;
350 }
351
352 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
353 {
354 if (!DIFF_FILE_VALID(one)) {
355 mf->ptr = (char *)""; /* does not matter */
356 mf->size = 0;
357 return 0;
358 }
359 else if (diff_populate_filespec(one, 0))
360 return -1;
361
362 mf->ptr = one->data;
363 mf->size = one->size;
364 return 0;
365 }
366
367 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
368 static unsigned long diff_filespec_size(struct diff_filespec *one)
369 {
370 if (!DIFF_FILE_VALID(one))
371 return 0;
372 diff_populate_filespec(one, 1);
373 return one->size;
374 }
375
376 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
377 {
378 char *ptr = mf->ptr;
379 long size = mf->size;
380 int cnt = 0;
381
382 if (!size)
383 return cnt;
384 ptr += size - 1; /* pointing at the very end */
385 if (*ptr != '\n')
386 ; /* incomplete line */
387 else
388 ptr--; /* skip the last LF */
389 while (mf->ptr < ptr) {
390 char *prev_eol;
391 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
392 if (*prev_eol == '\n')
393 break;
394 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
395 break;
396 cnt++;
397 ptr = prev_eol - 1;
398 }
399 return cnt;
400 }
401
402 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
403 struct emit_callback *ecbdata)
404 {
405 int l1, l2, at;
406 unsigned ws_rule = ecbdata->ws_rule;
407 l1 = count_trailing_blank(mf1, ws_rule);
408 l2 = count_trailing_blank(mf2, ws_rule);
409 if (l2 <= l1) {
410 ecbdata->blank_at_eof_in_preimage = 0;
411 ecbdata->blank_at_eof_in_postimage = 0;
412 return;
413 }
414 at = count_lines(mf1->ptr, mf1->size);
415 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
416
417 at = count_lines(mf2->ptr, mf2->size);
418 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
419 }
420
421 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
422 int first, const char *line, int len)
423 {
424 int has_trailing_newline, has_trailing_carriage_return;
425 int nofirst;
426 FILE *file = o->file;
427
428 fputs(diff_line_prefix(o), file);
429
430 if (len == 0) {
431 has_trailing_newline = (first == '\n');
432 has_trailing_carriage_return = (!has_trailing_newline &&
433 (first == '\r'));
434 nofirst = has_trailing_newline || has_trailing_carriage_return;
435 } else {
436 has_trailing_newline = (len > 0 && line[len-1] == '\n');
437 if (has_trailing_newline)
438 len--;
439 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
440 if (has_trailing_carriage_return)
441 len--;
442 nofirst = 0;
443 }
444
445 if (len || !nofirst) {
446 fputs(set, file);
447 if (!nofirst)
448 fputc(first, file);
449 fwrite(line, len, 1, file);
450 fputs(reset, file);
451 }
452 if (has_trailing_carriage_return)
453 fputc('\r', file);
454 if (has_trailing_newline)
455 fputc('\n', file);
456 }
457
458 static void emit_line(struct diff_options *o, const char *set, const char *reset,
459 const char *line, int len)
460 {
461 emit_line_0(o, set, reset, line[0], line+1, len-1);
462 }
463
464 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
465 {
466 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
467 ecbdata->blank_at_eof_in_preimage &&
468 ecbdata->blank_at_eof_in_postimage &&
469 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
470 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
471 return 0;
472 return ws_blank_line(line, len, ecbdata->ws_rule);
473 }
474
475 static void emit_add_line(const char *reset,
476 struct emit_callback *ecbdata,
477 const char *line, int len)
478 {
479 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
480 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
481
482 if (!*ws)
483 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
484 else if (new_blank_line_at_eof(ecbdata, line, len))
485 /* Blank line at EOF - paint '+' as well */
486 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
487 else {
488 /* Emit just the prefix, then the rest. */
489 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
490 ws_check_emit(line, len, ecbdata->ws_rule,
491 ecbdata->opt->file, set, reset, ws);
492 }
493 }
494
495 static void emit_hunk_header(struct emit_callback *ecbdata,
496 const char *line, int len)
497 {
498 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
499 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
500 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
501 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
502 static const char atat[2] = { '@', '@' };
503 const char *cp, *ep;
504 struct strbuf msgbuf = STRBUF_INIT;
505 int org_len = len;
506 int i = 1;
507
508 /*
509 * As a hunk header must begin with "@@ -<old>, +<new> @@",
510 * it always is at least 10 bytes long.
511 */
512 if (len < 10 ||
513 memcmp(line, atat, 2) ||
514 !(ep = memmem(line + 2, len - 2, atat, 2))) {
515 emit_line(ecbdata->opt, plain, reset, line, len);
516 return;
517 }
518 ep += 2; /* skip over @@ */
519
520 /* The hunk header in fraginfo color */
521 strbuf_add(&msgbuf, frag, strlen(frag));
522 strbuf_add(&msgbuf, line, ep - line);
523 strbuf_add(&msgbuf, reset, strlen(reset));
524
525 /*
526 * trailing "\r\n"
527 */
528 for ( ; i < 3; i++)
529 if (line[len - i] == '\r' || line[len - i] == '\n')
530 len--;
531
532 /* blank before the func header */
533 for (cp = ep; ep - line < len; ep++)
534 if (*ep != ' ' && *ep != '\t')
535 break;
536 if (ep != cp) {
537 strbuf_add(&msgbuf, plain, strlen(plain));
538 strbuf_add(&msgbuf, cp, ep - cp);
539 strbuf_add(&msgbuf, reset, strlen(reset));
540 }
541
542 if (ep < line + len) {
543 strbuf_add(&msgbuf, func, strlen(func));
544 strbuf_add(&msgbuf, ep, line + len - ep);
545 strbuf_add(&msgbuf, reset, strlen(reset));
546 }
547
548 strbuf_add(&msgbuf, line + len, org_len - len);
549 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
550 strbuf_release(&msgbuf);
551 }
552
553 static struct diff_tempfile *claim_diff_tempfile(void) {
554 int i;
555 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
556 if (!diff_temp[i].name)
557 return diff_temp + i;
558 die("BUG: diff is failing to clean up its tempfiles");
559 }
560
561 static int remove_tempfile_installed;
562
563 static void remove_tempfile(void)
564 {
565 int i;
566 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
567 if (diff_temp[i].name == diff_temp[i].tmp_path)
568 unlink_or_warn(diff_temp[i].name);
569 diff_temp[i].name = NULL;
570 }
571 }
572
573 static void remove_tempfile_on_signal(int signo)
574 {
575 remove_tempfile();
576 sigchain_pop(signo);
577 raise(signo);
578 }
579
580 static void print_line_count(FILE *file, int count)
581 {
582 switch (count) {
583 case 0:
584 fprintf(file, "0,0");
585 break;
586 case 1:
587 fprintf(file, "1");
588 break;
589 default:
590 fprintf(file, "1,%d", count);
591 break;
592 }
593 }
594
595 static void emit_rewrite_lines(struct emit_callback *ecb,
596 int prefix, const char *data, int size)
597 {
598 const char *endp = NULL;
599 static const char *nneof = " No newline at end of file\n";
600 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
601 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
602
603 while (0 < size) {
604 int len;
605
606 endp = memchr(data, '\n', size);
607 len = endp ? (endp - data + 1) : size;
608 if (prefix != '+') {
609 ecb->lno_in_preimage++;
610 emit_line_0(ecb->opt, old, reset, '-',
611 data, len);
612 } else {
613 ecb->lno_in_postimage++;
614 emit_add_line(reset, ecb, data, len);
615 }
616 size -= len;
617 data += len;
618 }
619 if (!endp) {
620 const char *plain = diff_get_color(ecb->color_diff,
621 DIFF_PLAIN);
622 putc('\n', ecb->opt->file);
623 emit_line_0(ecb->opt, plain, reset, '\\',
624 nneof, strlen(nneof));
625 }
626 }
627
628 static void emit_rewrite_diff(const char *name_a,
629 const char *name_b,
630 struct diff_filespec *one,
631 struct diff_filespec *two,
632 struct userdiff_driver *textconv_one,
633 struct userdiff_driver *textconv_two,
634 struct diff_options *o)
635 {
636 int lc_a, lc_b;
637 const char *name_a_tab, *name_b_tab;
638 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
639 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
640 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
641 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
642 const char *a_prefix, *b_prefix;
643 char *data_one, *data_two;
644 size_t size_one, size_two;
645 struct emit_callback ecbdata;
646 const char *line_prefix = diff_line_prefix(o);
647
648 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
649 a_prefix = o->b_prefix;
650 b_prefix = o->a_prefix;
651 } else {
652 a_prefix = o->a_prefix;
653 b_prefix = o->b_prefix;
654 }
655
656 name_a += (*name_a == '/');
657 name_b += (*name_b == '/');
658 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
659 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
660
661 strbuf_reset(&a_name);
662 strbuf_reset(&b_name);
663 quote_two_c_style(&a_name, a_prefix, name_a, 0);
664 quote_two_c_style(&b_name, b_prefix, name_b, 0);
665
666 size_one = fill_textconv(textconv_one, one, &data_one);
667 size_two = fill_textconv(textconv_two, two, &data_two);
668
669 memset(&ecbdata, 0, sizeof(ecbdata));
670 ecbdata.color_diff = want_color(o->use_color);
671 ecbdata.found_changesp = &o->found_changes;
672 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
673 ecbdata.opt = o;
674 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
675 mmfile_t mf1, mf2;
676 mf1.ptr = (char *)data_one;
677 mf2.ptr = (char *)data_two;
678 mf1.size = size_one;
679 mf2.size = size_two;
680 check_blank_at_eof(&mf1, &mf2, &ecbdata);
681 }
682 ecbdata.lno_in_preimage = 1;
683 ecbdata.lno_in_postimage = 1;
684
685 lc_a = count_lines(data_one, size_one);
686 lc_b = count_lines(data_two, size_two);
687 fprintf(o->file,
688 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
689 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
690 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
691 line_prefix, fraginfo);
692 if (!o->irreversible_delete)
693 print_line_count(o->file, lc_a);
694 else
695 fprintf(o->file, "?,?");
696 fprintf(o->file, " +");
697 print_line_count(o->file, lc_b);
698 fprintf(o->file, " @@%s\n", reset);
699 if (lc_a && !o->irreversible_delete)
700 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
701 if (lc_b)
702 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
703 if (textconv_one)
704 free((char *)data_one);
705 if (textconv_two)
706 free((char *)data_two);
707 }
708
709 struct diff_words_buffer {
710 mmfile_t text;
711 long alloc;
712 struct diff_words_orig {
713 const char *begin, *end;
714 } *orig;
715 int orig_nr, orig_alloc;
716 };
717
718 static void diff_words_append(char *line, unsigned long len,
719 struct diff_words_buffer *buffer)
720 {
721 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
722 line++;
723 len--;
724 memcpy(buffer->text.ptr + buffer->text.size, line, len);
725 buffer->text.size += len;
726 buffer->text.ptr[buffer->text.size] = '\0';
727 }
728
729 struct diff_words_style_elem {
730 const char *prefix;
731 const char *suffix;
732 const char *color; /* NULL; filled in by the setup code if
733 * color is enabled */
734 };
735
736 struct diff_words_style {
737 enum diff_words_type type;
738 struct diff_words_style_elem new, old, ctx;
739 const char *newline;
740 };
741
742 static struct diff_words_style diff_words_styles[] = {
743 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
744 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
745 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
746 };
747
748 struct diff_words_data {
749 struct diff_words_buffer minus, plus;
750 const char *current_plus;
751 int last_minus;
752 struct diff_options *opt;
753 regex_t *word_regex;
754 enum diff_words_type type;
755 struct diff_words_style *style;
756 };
757
758 static int fn_out_diff_words_write_helper(FILE *fp,
759 struct diff_words_style_elem *st_el,
760 const char *newline,
761 size_t count, const char *buf,
762 const char *line_prefix)
763 {
764 int print = 0;
765
766 while (count) {
767 char *p = memchr(buf, '\n', count);
768 if (print)
769 fputs(line_prefix, fp);
770 if (p != buf) {
771 if (st_el->color && fputs(st_el->color, fp) < 0)
772 return -1;
773 if (fputs(st_el->prefix, fp) < 0 ||
774 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
775 fputs(st_el->suffix, fp) < 0)
776 return -1;
777 if (st_el->color && *st_el->color
778 && fputs(GIT_COLOR_RESET, fp) < 0)
779 return -1;
780 }
781 if (!p)
782 return 0;
783 if (fputs(newline, fp) < 0)
784 return -1;
785 count -= p + 1 - buf;
786 buf = p + 1;
787 print = 1;
788 }
789 return 0;
790 }
791
792 /*
793 * '--color-words' algorithm can be described as:
794 *
795 * 1. collect a the minus/plus lines of a diff hunk, divided into
796 * minus-lines and plus-lines;
797 *
798 * 2. break both minus-lines and plus-lines into words and
799 * place them into two mmfile_t with one word for each line;
800 *
801 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
802 *
803 * And for the common parts of the both file, we output the plus side text.
804 * diff_words->current_plus is used to trace the current position of the plus file
805 * which printed. diff_words->last_minus is used to trace the last minus word
806 * printed.
807 *
808 * For '--graph' to work with '--color-words', we need to output the graph prefix
809 * on each line of color words output. Generally, there are two conditions on
810 * which we should output the prefix.
811 *
812 * 1. diff_words->last_minus == 0 &&
813 * diff_words->current_plus == diff_words->plus.text.ptr
814 *
815 * that is: the plus text must start as a new line, and if there is no minus
816 * word printed, a graph prefix must be printed.
817 *
818 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
819 * *(diff_words->current_plus - 1) == '\n'
820 *
821 * that is: a graph prefix must be printed following a '\n'
822 */
823 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
824 {
825 if ((diff_words->last_minus == 0 &&
826 diff_words->current_plus == diff_words->plus.text.ptr) ||
827 (diff_words->current_plus > diff_words->plus.text.ptr &&
828 *(diff_words->current_plus - 1) == '\n')) {
829 return 1;
830 } else {
831 return 0;
832 }
833 }
834
835 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
836 {
837 struct diff_words_data *diff_words = priv;
838 struct diff_words_style *style = diff_words->style;
839 int minus_first, minus_len, plus_first, plus_len;
840 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
841 struct diff_options *opt = diff_words->opt;
842 const char *line_prefix;
843
844 if (line[0] != '@' || parse_hunk_header(line, len,
845 &minus_first, &minus_len, &plus_first, &plus_len))
846 return;
847
848 assert(opt);
849 line_prefix = diff_line_prefix(opt);
850
851 /* POSIX requires that first be decremented by one if len == 0... */
852 if (minus_len) {
853 minus_begin = diff_words->minus.orig[minus_first].begin;
854 minus_end =
855 diff_words->minus.orig[minus_first + minus_len - 1].end;
856 } else
857 minus_begin = minus_end =
858 diff_words->minus.orig[minus_first].end;
859
860 if (plus_len) {
861 plus_begin = diff_words->plus.orig[plus_first].begin;
862 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
863 } else
864 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
865
866 if (color_words_output_graph_prefix(diff_words)) {
867 fputs(line_prefix, diff_words->opt->file);
868 }
869 if (diff_words->current_plus != plus_begin) {
870 fn_out_diff_words_write_helper(diff_words->opt->file,
871 &style->ctx, style->newline,
872 plus_begin - diff_words->current_plus,
873 diff_words->current_plus, line_prefix);
874 if (*(plus_begin - 1) == '\n')
875 fputs(line_prefix, diff_words->opt->file);
876 }
877 if (minus_begin != minus_end) {
878 fn_out_diff_words_write_helper(diff_words->opt->file,
879 &style->old, style->newline,
880 minus_end - minus_begin, minus_begin,
881 line_prefix);
882 }
883 if (plus_begin != plus_end) {
884 fn_out_diff_words_write_helper(diff_words->opt->file,
885 &style->new, style->newline,
886 plus_end - plus_begin, plus_begin,
887 line_prefix);
888 }
889
890 diff_words->current_plus = plus_end;
891 diff_words->last_minus = minus_first;
892 }
893
894 /* This function starts looking at *begin, and returns 0 iff a word was found. */
895 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
896 int *begin, int *end)
897 {
898 if (word_regex && *begin < buffer->size) {
899 regmatch_t match[1];
900 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
901 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
902 '\n', match[0].rm_eo - match[0].rm_so);
903 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
904 *begin += match[0].rm_so;
905 return *begin >= *end;
906 }
907 return -1;
908 }
909
910 /* find the next word */
911 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
912 (*begin)++;
913 if (*begin >= buffer->size)
914 return -1;
915
916 /* find the end of the word */
917 *end = *begin + 1;
918 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
919 (*end)++;
920
921 return 0;
922 }
923
924 /*
925 * This function splits the words in buffer->text, stores the list with
926 * newline separator into out, and saves the offsets of the original words
927 * in buffer->orig.
928 */
929 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
930 regex_t *word_regex)
931 {
932 int i, j;
933 long alloc = 0;
934
935 out->size = 0;
936 out->ptr = NULL;
937
938 /* fake an empty "0th" word */
939 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
940 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
941 buffer->orig_nr = 1;
942
943 for (i = 0; i < buffer->text.size; i++) {
944 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
945 return;
946
947 /* store original boundaries */
948 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
949 buffer->orig_alloc);
950 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
951 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
952 buffer->orig_nr++;
953
954 /* store one word */
955 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
956 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
957 out->ptr[out->size + j - i] = '\n';
958 out->size += j - i + 1;
959
960 i = j - 1;
961 }
962 }
963
964 /* this executes the word diff on the accumulated buffers */
965 static void diff_words_show(struct diff_words_data *diff_words)
966 {
967 xpparam_t xpp;
968 xdemitconf_t xecfg;
969 mmfile_t minus, plus;
970 struct diff_words_style *style = diff_words->style;
971
972 struct diff_options *opt = diff_words->opt;
973 const char *line_prefix;
974
975 assert(opt);
976 line_prefix = diff_line_prefix(opt);
977
978 /* special case: only removal */
979 if (!diff_words->plus.text.size) {
980 fputs(line_prefix, diff_words->opt->file);
981 fn_out_diff_words_write_helper(diff_words->opt->file,
982 &style->old, style->newline,
983 diff_words->minus.text.size,
984 diff_words->minus.text.ptr, line_prefix);
985 diff_words->minus.text.size = 0;
986 return;
987 }
988
989 diff_words->current_plus = diff_words->plus.text.ptr;
990 diff_words->last_minus = 0;
991
992 memset(&xpp, 0, sizeof(xpp));
993 memset(&xecfg, 0, sizeof(xecfg));
994 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
995 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
996 xpp.flags = 0;
997 /* as only the hunk header will be parsed, we need a 0-context */
998 xecfg.ctxlen = 0;
999 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1000 &xpp, &xecfg);
1001 free(minus.ptr);
1002 free(plus.ptr);
1003 if (diff_words->current_plus != diff_words->plus.text.ptr +
1004 diff_words->plus.text.size) {
1005 if (color_words_output_graph_prefix(diff_words))
1006 fputs(line_prefix, diff_words->opt->file);
1007 fn_out_diff_words_write_helper(diff_words->opt->file,
1008 &style->ctx, style->newline,
1009 diff_words->plus.text.ptr + diff_words->plus.text.size
1010 - diff_words->current_plus, diff_words->current_plus,
1011 line_prefix);
1012 }
1013 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1014 }
1015
1016 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1017 static void diff_words_flush(struct emit_callback *ecbdata)
1018 {
1019 if (ecbdata->diff_words->minus.text.size ||
1020 ecbdata->diff_words->plus.text.size)
1021 diff_words_show(ecbdata->diff_words);
1022 }
1023
1024 static void diff_filespec_load_driver(struct diff_filespec *one)
1025 {
1026 /* Use already-loaded driver */
1027 if (one->driver)
1028 return;
1029
1030 if (S_ISREG(one->mode))
1031 one->driver = userdiff_find_by_path(one->path);
1032
1033 /* Fallback to default settings */
1034 if (!one->driver)
1035 one->driver = userdiff_find_by_name("default");
1036 }
1037
1038 static const char *userdiff_word_regex(struct diff_filespec *one)
1039 {
1040 diff_filespec_load_driver(one);
1041 return one->driver->word_regex;
1042 }
1043
1044 static void init_diff_words_data(struct emit_callback *ecbdata,
1045 struct diff_options *orig_opts,
1046 struct diff_filespec *one,
1047 struct diff_filespec *two)
1048 {
1049 int i;
1050 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1051 memcpy(o, orig_opts, sizeof(struct diff_options));
1052
1053 ecbdata->diff_words =
1054 xcalloc(1, sizeof(struct diff_words_data));
1055 ecbdata->diff_words->type = o->word_diff;
1056 ecbdata->diff_words->opt = o;
1057 if (!o->word_regex)
1058 o->word_regex = userdiff_word_regex(one);
1059 if (!o->word_regex)
1060 o->word_regex = userdiff_word_regex(two);
1061 if (!o->word_regex)
1062 o->word_regex = diff_word_regex_cfg;
1063 if (o->word_regex) {
1064 ecbdata->diff_words->word_regex = (regex_t *)
1065 xmalloc(sizeof(regex_t));
1066 if (regcomp(ecbdata->diff_words->word_regex,
1067 o->word_regex,
1068 REG_EXTENDED | REG_NEWLINE))
1069 die ("Invalid regular expression: %s",
1070 o->word_regex);
1071 }
1072 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1073 if (o->word_diff == diff_words_styles[i].type) {
1074 ecbdata->diff_words->style =
1075 &diff_words_styles[i];
1076 break;
1077 }
1078 }
1079 if (want_color(o->use_color)) {
1080 struct diff_words_style *st = ecbdata->diff_words->style;
1081 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1082 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1083 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1084 }
1085 }
1086
1087 static void free_diff_words_data(struct emit_callback *ecbdata)
1088 {
1089 if (ecbdata->diff_words) {
1090 diff_words_flush(ecbdata);
1091 free (ecbdata->diff_words->opt);
1092 free (ecbdata->diff_words->minus.text.ptr);
1093 free (ecbdata->diff_words->minus.orig);
1094 free (ecbdata->diff_words->plus.text.ptr);
1095 free (ecbdata->diff_words->plus.orig);
1096 if (ecbdata->diff_words->word_regex) {
1097 regfree(ecbdata->diff_words->word_regex);
1098 free(ecbdata->diff_words->word_regex);
1099 }
1100 free(ecbdata->diff_words);
1101 ecbdata->diff_words = NULL;
1102 }
1103 }
1104
1105 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1106 {
1107 if (want_color(diff_use_color))
1108 return diff_colors[ix];
1109 return "";
1110 }
1111
1112 const char *diff_line_prefix(struct diff_options *opt)
1113 {
1114 struct strbuf *msgbuf;
1115 if (!opt->output_prefix)
1116 return "";
1117
1118 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1119 return msgbuf->buf;
1120 }
1121
1122 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1123 {
1124 const char *cp;
1125 unsigned long allot;
1126 size_t l = len;
1127
1128 if (ecb->truncate)
1129 return ecb->truncate(line, len);
1130 cp = line;
1131 allot = l;
1132 while (0 < l) {
1133 (void) utf8_width(&cp, &l);
1134 if (!cp)
1135 break; /* truncated in the middle? */
1136 }
1137 return allot - l;
1138 }
1139
1140 static void find_lno(const char *line, struct emit_callback *ecbdata)
1141 {
1142 const char *p;
1143 ecbdata->lno_in_preimage = 0;
1144 ecbdata->lno_in_postimage = 0;
1145 p = strchr(line, '-');
1146 if (!p)
1147 return; /* cannot happen */
1148 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1149 p = strchr(p, '+');
1150 if (!p)
1151 return; /* cannot happen */
1152 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1153 }
1154
1155 static void fn_out_consume(void *priv, char *line, unsigned long len)
1156 {
1157 struct emit_callback *ecbdata = priv;
1158 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1159 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1160 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1161 struct diff_options *o = ecbdata->opt;
1162 const char *line_prefix = diff_line_prefix(o);
1163
1164 if (ecbdata->header) {
1165 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1166 strbuf_reset(ecbdata->header);
1167 ecbdata->header = NULL;
1168 }
1169 *(ecbdata->found_changesp) = 1;
1170
1171 if (ecbdata->label_path[0]) {
1172 const char *name_a_tab, *name_b_tab;
1173
1174 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1175 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1176
1177 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1178 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1179 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1180 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1181 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1182 }
1183
1184 if (diff_suppress_blank_empty
1185 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1186 line[0] = '\n';
1187 len = 1;
1188 }
1189
1190 if (line[0] == '@') {
1191 if (ecbdata->diff_words)
1192 diff_words_flush(ecbdata);
1193 len = sane_truncate_line(ecbdata, line, len);
1194 find_lno(line, ecbdata);
1195 emit_hunk_header(ecbdata, line, len);
1196 if (line[len-1] != '\n')
1197 putc('\n', ecbdata->opt->file);
1198 return;
1199 }
1200
1201 if (len < 1) {
1202 emit_line(ecbdata->opt, reset, reset, line, len);
1203 if (ecbdata->diff_words
1204 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1205 fputs("~\n", ecbdata->opt->file);
1206 return;
1207 }
1208
1209 if (ecbdata->diff_words) {
1210 if (line[0] == '-') {
1211 diff_words_append(line, len,
1212 &ecbdata->diff_words->minus);
1213 return;
1214 } else if (line[0] == '+') {
1215 diff_words_append(line, len,
1216 &ecbdata->diff_words->plus);
1217 return;
1218 } else if (!prefixcmp(line, "\\ ")) {
1219 /*
1220 * Eat the "no newline at eof" marker as if we
1221 * saw a "+" or "-" line with nothing on it,
1222 * and return without diff_words_flush() to
1223 * defer processing. If this is the end of
1224 * preimage, more "+" lines may come after it.
1225 */
1226 return;
1227 }
1228 diff_words_flush(ecbdata);
1229 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1230 emit_line(ecbdata->opt, plain, reset, line, len);
1231 fputs("~\n", ecbdata->opt->file);
1232 } else {
1233 /*
1234 * Skip the prefix character, if any. With
1235 * diff_suppress_blank_empty, there may be
1236 * none.
1237 */
1238 if (line[0] != '\n') {
1239 line++;
1240 len--;
1241 }
1242 emit_line(ecbdata->opt, plain, reset, line, len);
1243 }
1244 return;
1245 }
1246
1247 if (line[0] != '+') {
1248 const char *color =
1249 diff_get_color(ecbdata->color_diff,
1250 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1251 ecbdata->lno_in_preimage++;
1252 if (line[0] == ' ')
1253 ecbdata->lno_in_postimage++;
1254 emit_line(ecbdata->opt, color, reset, line, len);
1255 } else {
1256 ecbdata->lno_in_postimage++;
1257 emit_add_line(reset, ecbdata, line + 1, len - 1);
1258 }
1259 }
1260
1261 static char *pprint_rename(const char *a, const char *b)
1262 {
1263 const char *old = a;
1264 const char *new = b;
1265 struct strbuf name = STRBUF_INIT;
1266 int pfx_length, sfx_length;
1267 int pfx_adjust_for_slash;
1268 int len_a = strlen(a);
1269 int len_b = strlen(b);
1270 int a_midlen, b_midlen;
1271 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1272 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1273
1274 if (qlen_a || qlen_b) {
1275 quote_c_style(a, &name, NULL, 0);
1276 strbuf_addstr(&name, " => ");
1277 quote_c_style(b, &name, NULL, 0);
1278 return strbuf_detach(&name, NULL);
1279 }
1280
1281 /* Find common prefix */
1282 pfx_length = 0;
1283 while (*old && *new && *old == *new) {
1284 if (*old == '/')
1285 pfx_length = old - a + 1;
1286 old++;
1287 new++;
1288 }
1289
1290 /* Find common suffix */
1291 old = a + len_a;
1292 new = b + len_b;
1293 sfx_length = 0;
1294 /*
1295 * If there is a common prefix, it must end in a slash. In
1296 * that case we let this loop run 1 into the prefix to see the
1297 * same slash.
1298 *
1299 * If there is no common prefix, we cannot do this as it would
1300 * underrun the input strings.
1301 */
1302 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1303 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1304 b + pfx_length - pfx_adjust_for_slash <= new &&
1305 *old == *new) {
1306 if (*old == '/')
1307 sfx_length = len_a - (old - a);
1308 old--;
1309 new--;
1310 }
1311
1312 /*
1313 * pfx{mid-a => mid-b}sfx
1314 * {pfx-a => pfx-b}sfx
1315 * pfx{sfx-a => sfx-b}
1316 * name-a => name-b
1317 */
1318 a_midlen = len_a - pfx_length - sfx_length;
1319 b_midlen = len_b - pfx_length - sfx_length;
1320 if (a_midlen < 0)
1321 a_midlen = 0;
1322 if (b_midlen < 0)
1323 b_midlen = 0;
1324
1325 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1326 if (pfx_length + sfx_length) {
1327 strbuf_add(&name, a, pfx_length);
1328 strbuf_addch(&name, '{');
1329 }
1330 strbuf_add(&name, a + pfx_length, a_midlen);
1331 strbuf_addstr(&name, " => ");
1332 strbuf_add(&name, b + pfx_length, b_midlen);
1333 if (pfx_length + sfx_length) {
1334 strbuf_addch(&name, '}');
1335 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1336 }
1337 return strbuf_detach(&name, NULL);
1338 }
1339
1340 struct diffstat_t {
1341 int nr;
1342 int alloc;
1343 struct diffstat_file {
1344 char *from_name;
1345 char *name;
1346 char *print_name;
1347 unsigned is_unmerged:1;
1348 unsigned is_binary:1;
1349 unsigned is_renamed:1;
1350 unsigned is_interesting:1;
1351 uintmax_t added, deleted;
1352 } **files;
1353 };
1354
1355 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1356 const char *name_a,
1357 const char *name_b)
1358 {
1359 struct diffstat_file *x;
1360 x = xcalloc(sizeof (*x), 1);
1361 if (diffstat->nr == diffstat->alloc) {
1362 diffstat->alloc = alloc_nr(diffstat->alloc);
1363 diffstat->files = xrealloc(diffstat->files,
1364 diffstat->alloc * sizeof(x));
1365 }
1366 diffstat->files[diffstat->nr++] = x;
1367 if (name_b) {
1368 x->from_name = xstrdup(name_a);
1369 x->name = xstrdup(name_b);
1370 x->is_renamed = 1;
1371 }
1372 else {
1373 x->from_name = NULL;
1374 x->name = xstrdup(name_a);
1375 }
1376 return x;
1377 }
1378
1379 static void diffstat_consume(void *priv, char *line, unsigned long len)
1380 {
1381 struct diffstat_t *diffstat = priv;
1382 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1383
1384 if (line[0] == '+')
1385 x->added++;
1386 else if (line[0] == '-')
1387 x->deleted++;
1388 }
1389
1390 const char mime_boundary_leader[] = "------------";
1391
1392 static int scale_linear(int it, int width, int max_change)
1393 {
1394 if (!it)
1395 return 0;
1396 /*
1397 * make sure that at least one '-' or '+' is printed if
1398 * there is any change to this path. The easiest way is to
1399 * scale linearly as if the alloted width is one column shorter
1400 * than it is, and then add 1 to the result.
1401 */
1402 return 1 + (it * (width - 1) / max_change);
1403 }
1404
1405 static void show_name(FILE *file,
1406 const char *prefix, const char *name, int len)
1407 {
1408 fprintf(file, " %s%-*s |", prefix, len, name);
1409 }
1410
1411 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1412 {
1413 if (cnt <= 0)
1414 return;
1415 fprintf(file, "%s", set);
1416 while (cnt--)
1417 putc(ch, file);
1418 fprintf(file, "%s", reset);
1419 }
1420
1421 static void fill_print_name(struct diffstat_file *file)
1422 {
1423 char *pname;
1424
1425 if (file->print_name)
1426 return;
1427
1428 if (!file->is_renamed) {
1429 struct strbuf buf = STRBUF_INIT;
1430 if (quote_c_style(file->name, &buf, NULL, 0)) {
1431 pname = strbuf_detach(&buf, NULL);
1432 } else {
1433 pname = file->name;
1434 strbuf_release(&buf);
1435 }
1436 } else {
1437 pname = pprint_rename(file->from_name, file->name);
1438 }
1439 file->print_name = pname;
1440 }
1441
1442 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1443 {
1444 struct strbuf sb = STRBUF_INIT;
1445 int ret;
1446
1447 if (!files) {
1448 assert(insertions == 0 && deletions == 0);
1449 return fprintf(fp, "%s\n", " 0 files changed");
1450 }
1451
1452 strbuf_addf(&sb,
1453 (files == 1) ? " %d file changed" : " %d files changed",
1454 files);
1455
1456 /*
1457 * For binary diff, the caller may want to print "x files
1458 * changed" with insertions == 0 && deletions == 0.
1459 *
1460 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1461 * is probably less confusing (i.e skip over "2 files changed
1462 * but nothing about added/removed lines? Is this a bug in Git?").
1463 */
1464 if (insertions || deletions == 0) {
1465 /*
1466 * TRANSLATORS: "+" in (+) is a line addition marker;
1467 * do not translate it.
1468 */
1469 strbuf_addf(&sb,
1470 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1471 insertions);
1472 }
1473
1474 if (deletions || insertions == 0) {
1475 /*
1476 * TRANSLATORS: "-" in (-) is a line removal marker;
1477 * do not translate it.
1478 */
1479 strbuf_addf(&sb,
1480 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1481 deletions);
1482 }
1483 strbuf_addch(&sb, '\n');
1484 ret = fputs(sb.buf, fp);
1485 strbuf_release(&sb);
1486 return ret;
1487 }
1488
1489 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1490 {
1491 int i, len, add, del, adds = 0, dels = 0;
1492 uintmax_t max_change = 0, max_len = 0;
1493 int total_files = data->nr, count;
1494 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1495 const char *reset, *add_c, *del_c;
1496 const char *line_prefix = "";
1497 int extra_shown = 0;
1498
1499 if (data->nr == 0)
1500 return;
1501
1502 line_prefix = diff_line_prefix(options);
1503 count = options->stat_count ? options->stat_count : data->nr;
1504
1505 reset = diff_get_color_opt(options, DIFF_RESET);
1506 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1507 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1508
1509 /*
1510 * Find the longest filename and max number of changes
1511 */
1512 for (i = 0; (i < count) && (i < data->nr); i++) {
1513 struct diffstat_file *file = data->files[i];
1514 uintmax_t change = file->added + file->deleted;
1515
1516 if (!file->is_interesting && (change == 0)) {
1517 count++; /* not shown == room for one more */
1518 continue;
1519 }
1520 fill_print_name(file);
1521 len = strlen(file->print_name);
1522 if (max_len < len)
1523 max_len = len;
1524
1525 if (file->is_unmerged) {
1526 /* "Unmerged" is 8 characters */
1527 bin_width = bin_width < 8 ? 8 : bin_width;
1528 continue;
1529 }
1530 if (file->is_binary) {
1531 /* "Bin XXX -> YYY bytes" */
1532 int w = 14 + decimal_width(file->added)
1533 + decimal_width(file->deleted);
1534 bin_width = bin_width < w ? w : bin_width;
1535 /* Display change counts aligned with "Bin" */
1536 number_width = 3;
1537 continue;
1538 }
1539
1540 if (max_change < change)
1541 max_change = change;
1542 }
1543 count = i; /* where we can stop scanning in data->files[] */
1544
1545 /*
1546 * We have width = stat_width or term_columns() columns total.
1547 * We want a maximum of min(max_len, stat_name_width) for the name part.
1548 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1549 * We also need 1 for " " and 4 + decimal_width(max_change)
1550 * for " | NNNN " and one the empty column at the end, altogether
1551 * 6 + decimal_width(max_change).
1552 *
1553 * If there's not enough space, we will use the smaller of
1554 * stat_name_width (if set) and 5/8*width for the filename,
1555 * and the rest for constant elements + graph part, but no more
1556 * than stat_graph_width for the graph part.
1557 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1558 * for the standard terminal size).
1559 *
1560 * In other words: stat_width limits the maximum width, and
1561 * stat_name_width fixes the maximum width of the filename,
1562 * and is also used to divide available columns if there
1563 * aren't enough.
1564 *
1565 * Binary files are displayed with "Bin XXX -> YYY bytes"
1566 * instead of the change count and graph. This part is treated
1567 * similarly to the graph part, except that it is not
1568 * "scaled". If total width is too small to accommodate the
1569 * guaranteed minimum width of the filename part and the
1570 * separators and this message, this message will "overflow"
1571 * making the line longer than the maximum width.
1572 */
1573
1574 if (options->stat_width == -1)
1575 width = term_columns() - options->output_prefix_length;
1576 else
1577 width = options->stat_width ? options->stat_width : 80;
1578 number_width = decimal_width(max_change) > number_width ?
1579 decimal_width(max_change) : number_width;
1580
1581 if (options->stat_graph_width == -1)
1582 options->stat_graph_width = diff_stat_graph_width;
1583
1584 /*
1585 * Guarantee 3/8*16==6 for the graph part
1586 * and 5/8*16==10 for the filename part
1587 */
1588 if (width < 16 + 6 + number_width)
1589 width = 16 + 6 + number_width;
1590
1591 /*
1592 * First assign sizes that are wanted, ignoring available width.
1593 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1594 * starting from "XXX" should fit in graph_width.
1595 */
1596 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1597 if (options->stat_graph_width &&
1598 options->stat_graph_width < graph_width)
1599 graph_width = options->stat_graph_width;
1600
1601 name_width = (options->stat_name_width > 0 &&
1602 options->stat_name_width < max_len) ?
1603 options->stat_name_width : max_len;
1604
1605 /*
1606 * Adjust adjustable widths not to exceed maximum width
1607 */
1608 if (name_width + number_width + 6 + graph_width > width) {
1609 if (graph_width > width * 3/8 - number_width - 6) {
1610 graph_width = width * 3/8 - number_width - 6;
1611 if (graph_width < 6)
1612 graph_width = 6;
1613 }
1614
1615 if (options->stat_graph_width &&
1616 graph_width > options->stat_graph_width)
1617 graph_width = options->stat_graph_width;
1618 if (name_width > width - number_width - 6 - graph_width)
1619 name_width = width - number_width - 6 - graph_width;
1620 else
1621 graph_width = width - number_width - 6 - name_width;
1622 }
1623
1624 /*
1625 * From here name_width is the width of the name area,
1626 * and graph_width is the width of the graph area.
1627 * max_change is used to scale graph properly.
1628 */
1629 for (i = 0; i < count; i++) {
1630 const char *prefix = "";
1631 struct diffstat_file *file = data->files[i];
1632 char *name = file->print_name;
1633 uintmax_t added = file->added;
1634 uintmax_t deleted = file->deleted;
1635 int name_len;
1636
1637 if (!file->is_interesting && (added + deleted == 0))
1638 continue;
1639
1640 /*
1641 * "scale" the filename
1642 */
1643 len = name_width;
1644 name_len = strlen(name);
1645 if (name_width < name_len) {
1646 char *slash;
1647 prefix = "...";
1648 len -= 3;
1649 name += name_len - len;
1650 slash = strchr(name, '/');
1651 if (slash)
1652 name = slash;
1653 }
1654
1655 if (file->is_binary) {
1656 fprintf(options->file, "%s", line_prefix);
1657 show_name(options->file, prefix, name, len);
1658 fprintf(options->file, " %*s", number_width, "Bin");
1659 if (!added && !deleted) {
1660 putc('\n', options->file);
1661 continue;
1662 }
1663 fprintf(options->file, " %s%"PRIuMAX"%s",
1664 del_c, deleted, reset);
1665 fprintf(options->file, " -> ");
1666 fprintf(options->file, "%s%"PRIuMAX"%s",
1667 add_c, added, reset);
1668 fprintf(options->file, " bytes");
1669 fprintf(options->file, "\n");
1670 continue;
1671 }
1672 else if (file->is_unmerged) {
1673 fprintf(options->file, "%s", line_prefix);
1674 show_name(options->file, prefix, name, len);
1675 fprintf(options->file, " Unmerged\n");
1676 continue;
1677 }
1678
1679 /*
1680 * scale the add/delete
1681 */
1682 add = added;
1683 del = deleted;
1684
1685 if (graph_width <= max_change) {
1686 int total = add + del;
1687
1688 total = scale_linear(add + del, graph_width, max_change);
1689 if (total < 2 && add && del)
1690 /* width >= 2 due to the sanity check */
1691 total = 2;
1692 if (add < del) {
1693 add = scale_linear(add, graph_width, max_change);
1694 del = total - add;
1695 } else {
1696 del = scale_linear(del, graph_width, max_change);
1697 add = total - del;
1698 }
1699 }
1700 fprintf(options->file, "%s", line_prefix);
1701 show_name(options->file, prefix, name, len);
1702 fprintf(options->file, " %*"PRIuMAX"%s",
1703 number_width, added + deleted,
1704 added + deleted ? " " : "");
1705 show_graph(options->file, '+', add, add_c, reset);
1706 show_graph(options->file, '-', del, del_c, reset);
1707 fprintf(options->file, "\n");
1708 }
1709
1710 for (i = 0; i < data->nr; i++) {
1711 struct diffstat_file *file = data->files[i];
1712 uintmax_t added = file->added;
1713 uintmax_t deleted = file->deleted;
1714
1715 if (file->is_unmerged ||
1716 (!file->is_interesting && (added + deleted == 0))) {
1717 total_files--;
1718 continue;
1719 }
1720
1721 if (!file->is_binary) {
1722 adds += added;
1723 dels += deleted;
1724 }
1725 if (i < count)
1726 continue;
1727 if (!extra_shown)
1728 fprintf(options->file, "%s ...\n", line_prefix);
1729 extra_shown = 1;
1730 }
1731 fprintf(options->file, "%s", line_prefix);
1732 print_stat_summary(options->file, total_files, adds, dels);
1733 }
1734
1735 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1736 {
1737 int i, adds = 0, dels = 0, total_files = data->nr;
1738
1739 if (data->nr == 0)
1740 return;
1741
1742 for (i = 0; i < data->nr; i++) {
1743 int added = data->files[i]->added;
1744 int deleted= data->files[i]->deleted;
1745
1746 if (data->files[i]->is_unmerged ||
1747 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1748 total_files--;
1749 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1750 adds += added;
1751 dels += deleted;
1752 }
1753 }
1754 fprintf(options->file, "%s", diff_line_prefix(options));
1755 print_stat_summary(options->file, total_files, adds, dels);
1756 }
1757
1758 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1759 {
1760 int i;
1761
1762 if (data->nr == 0)
1763 return;
1764
1765 for (i = 0; i < data->nr; i++) {
1766 struct diffstat_file *file = data->files[i];
1767
1768 fprintf(options->file, "%s", diff_line_prefix(options));
1769
1770 if (file->is_binary)
1771 fprintf(options->file, "-\t-\t");
1772 else
1773 fprintf(options->file,
1774 "%"PRIuMAX"\t%"PRIuMAX"\t",
1775 file->added, file->deleted);
1776 if (options->line_termination) {
1777 fill_print_name(file);
1778 if (!file->is_renamed)
1779 write_name_quoted(file->name, options->file,
1780 options->line_termination);
1781 else {
1782 fputs(file->print_name, options->file);
1783 putc(options->line_termination, options->file);
1784 }
1785 } else {
1786 if (file->is_renamed) {
1787 putc('\0', options->file);
1788 write_name_quoted(file->from_name, options->file, '\0');
1789 }
1790 write_name_quoted(file->name, options->file, '\0');
1791 }
1792 }
1793 }
1794
1795 struct dirstat_file {
1796 const char *name;
1797 unsigned long changed;
1798 };
1799
1800 struct dirstat_dir {
1801 struct dirstat_file *files;
1802 int alloc, nr, permille, cumulative;
1803 };
1804
1805 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1806 unsigned long changed, const char *base, int baselen)
1807 {
1808 unsigned long this_dir = 0;
1809 unsigned int sources = 0;
1810 const char *line_prefix = diff_line_prefix(opt);
1811
1812 while (dir->nr) {
1813 struct dirstat_file *f = dir->files;
1814 int namelen = strlen(f->name);
1815 unsigned long this;
1816 char *slash;
1817
1818 if (namelen < baselen)
1819 break;
1820 if (memcmp(f->name, base, baselen))
1821 break;
1822 slash = strchr(f->name + baselen, '/');
1823 if (slash) {
1824 int newbaselen = slash + 1 - f->name;
1825 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1826 sources++;
1827 } else {
1828 this = f->changed;
1829 dir->files++;
1830 dir->nr--;
1831 sources += 2;
1832 }
1833 this_dir += this;
1834 }
1835
1836 /*
1837 * We don't report dirstat's for
1838 * - the top level
1839 * - or cases where everything came from a single directory
1840 * under this directory (sources == 1).
1841 */
1842 if (baselen && sources != 1) {
1843 if (this_dir) {
1844 int permille = this_dir * 1000 / changed;
1845 if (permille >= dir->permille) {
1846 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1847 permille / 10, permille % 10, baselen, base);
1848 if (!dir->cumulative)
1849 return 0;
1850 }
1851 }
1852 }
1853 return this_dir;
1854 }
1855
1856 static int dirstat_compare(const void *_a, const void *_b)
1857 {
1858 const struct dirstat_file *a = _a;
1859 const struct dirstat_file *b = _b;
1860 return strcmp(a->name, b->name);
1861 }
1862
1863 static void show_dirstat(struct diff_options *options)
1864 {
1865 int i;
1866 unsigned long changed;
1867 struct dirstat_dir dir;
1868 struct diff_queue_struct *q = &diff_queued_diff;
1869
1870 dir.files = NULL;
1871 dir.alloc = 0;
1872 dir.nr = 0;
1873 dir.permille = options->dirstat_permille;
1874 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1875
1876 changed = 0;
1877 for (i = 0; i < q->nr; i++) {
1878 struct diff_filepair *p = q->queue[i];
1879 const char *name;
1880 unsigned long copied, added, damage;
1881 int content_changed;
1882
1883 name = p->two->path ? p->two->path : p->one->path;
1884
1885 if (p->one->sha1_valid && p->two->sha1_valid)
1886 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1887 else
1888 content_changed = 1;
1889
1890 if (!content_changed) {
1891 /*
1892 * The SHA1 has not changed, so pre-/post-content is
1893 * identical. We can therefore skip looking at the
1894 * file contents altogether.
1895 */
1896 damage = 0;
1897 goto found_damage;
1898 }
1899
1900 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1901 /*
1902 * In --dirstat-by-file mode, we don't really need to
1903 * look at the actual file contents at all.
1904 * The fact that the SHA1 changed is enough for us to
1905 * add this file to the list of results
1906 * (with each file contributing equal damage).
1907 */
1908 damage = 1;
1909 goto found_damage;
1910 }
1911
1912 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1913 diff_populate_filespec(p->one, 0);
1914 diff_populate_filespec(p->two, 0);
1915 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1916 &copied, &added);
1917 diff_free_filespec_data(p->one);
1918 diff_free_filespec_data(p->two);
1919 } else if (DIFF_FILE_VALID(p->one)) {
1920 diff_populate_filespec(p->one, 1);
1921 copied = added = 0;
1922 diff_free_filespec_data(p->one);
1923 } else if (DIFF_FILE_VALID(p->two)) {
1924 diff_populate_filespec(p->two, 1);
1925 copied = 0;
1926 added = p->two->size;
1927 diff_free_filespec_data(p->two);
1928 } else
1929 continue;
1930
1931 /*
1932 * Original minus copied is the removed material,
1933 * added is the new material. They are both damages
1934 * made to the preimage.
1935 * If the resulting damage is zero, we know that
1936 * diffcore_count_changes() considers the two entries to
1937 * be identical, but since content_changed is true, we
1938 * know that there must have been _some_ kind of change,
1939 * so we force all entries to have damage > 0.
1940 */
1941 damage = (p->one->size - copied) + added;
1942 if (!damage)
1943 damage = 1;
1944
1945 found_damage:
1946 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1947 dir.files[dir.nr].name = name;
1948 dir.files[dir.nr].changed = damage;
1949 changed += damage;
1950 dir.nr++;
1951 }
1952
1953 /* This can happen even with many files, if everything was renames */
1954 if (!changed)
1955 return;
1956
1957 /* Show all directories with more than x% of the changes */
1958 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1959 gather_dirstat(options, &dir, changed, "", 0);
1960 }
1961
1962 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1963 {
1964 int i;
1965 unsigned long changed;
1966 struct dirstat_dir dir;
1967
1968 if (data->nr == 0)
1969 return;
1970
1971 dir.files = NULL;
1972 dir.alloc = 0;
1973 dir.nr = 0;
1974 dir.permille = options->dirstat_permille;
1975 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1976
1977 changed = 0;
1978 for (i = 0; i < data->nr; i++) {
1979 struct diffstat_file *file = data->files[i];
1980 unsigned long damage = file->added + file->deleted;
1981 if (file->is_binary)
1982 /*
1983 * binary files counts bytes, not lines. Must find some
1984 * way to normalize binary bytes vs. textual lines.
1985 * The following heuristic assumes that there are 64
1986 * bytes per "line".
1987 * This is stupid and ugly, but very cheap...
1988 */
1989 damage = (damage + 63) / 64;
1990 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1991 dir.files[dir.nr].name = file->name;
1992 dir.files[dir.nr].changed = damage;
1993 changed += damage;
1994 dir.nr++;
1995 }
1996
1997 /* This can happen even with many files, if everything was renames */
1998 if (!changed)
1999 return;
2000
2001 /* Show all directories with more than x% of the changes */
2002 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2003 gather_dirstat(options, &dir, changed, "", 0);
2004 }
2005
2006 static void free_diffstat_info(struct diffstat_t *diffstat)
2007 {
2008 int i;
2009 for (i = 0; i < diffstat->nr; i++) {
2010 struct diffstat_file *f = diffstat->files[i];
2011 if (f->name != f->print_name)
2012 free(f->print_name);
2013 free(f->name);
2014 free(f->from_name);
2015 free(f);
2016 }
2017 free(diffstat->files);
2018 }
2019
2020 struct checkdiff_t {
2021 const char *filename;
2022 int lineno;
2023 int conflict_marker_size;
2024 struct diff_options *o;
2025 unsigned ws_rule;
2026 unsigned status;
2027 };
2028
2029 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2030 {
2031 char firstchar;
2032 int cnt;
2033
2034 if (len < marker_size + 1)
2035 return 0;
2036 firstchar = line[0];
2037 switch (firstchar) {
2038 case '=': case '>': case '<': case '|':
2039 break;
2040 default:
2041 return 0;
2042 }
2043 for (cnt = 1; cnt < marker_size; cnt++)
2044 if (line[cnt] != firstchar)
2045 return 0;
2046 /* line[1] thru line[marker_size-1] are same as firstchar */
2047 if (len < marker_size + 1 || !isspace(line[marker_size]))
2048 return 0;
2049 return 1;
2050 }
2051
2052 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2053 {
2054 struct checkdiff_t *data = priv;
2055 int marker_size = data->conflict_marker_size;
2056 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2057 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2058 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2059 char *err;
2060 const char *line_prefix;
2061
2062 assert(data->o);
2063 line_prefix = diff_line_prefix(data->o);
2064
2065 if (line[0] == '+') {
2066 unsigned bad;
2067 data->lineno++;
2068 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2069 data->status |= 1;
2070 fprintf(data->o->file,
2071 "%s%s:%d: leftover conflict marker\n",
2072 line_prefix, data->filename, data->lineno);
2073 }
2074 bad = ws_check(line + 1, len - 1, data->ws_rule);
2075 if (!bad)
2076 return;
2077 data->status |= bad;
2078 err = whitespace_error_string(bad);
2079 fprintf(data->o->file, "%s%s:%d: %s.\n",
2080 line_prefix, data->filename, data->lineno, err);
2081 free(err);
2082 emit_line(data->o, set, reset, line, 1);
2083 ws_check_emit(line + 1, len - 1, data->ws_rule,
2084 data->o->file, set, reset, ws);
2085 } else if (line[0] == ' ') {
2086 data->lineno++;
2087 } else if (line[0] == '@') {
2088 char *plus = strchr(line, '+');
2089 if (plus)
2090 data->lineno = strtol(plus, NULL, 10) - 1;
2091 else
2092 die("invalid diff");
2093 }
2094 }
2095
2096 static unsigned char *deflate_it(char *data,
2097 unsigned long size,
2098 unsigned long *result_size)
2099 {
2100 int bound;
2101 unsigned char *deflated;
2102 git_zstream stream;
2103
2104 memset(&stream, 0, sizeof(stream));
2105 git_deflate_init(&stream, zlib_compression_level);
2106 bound = git_deflate_bound(&stream, size);
2107 deflated = xmalloc(bound);
2108 stream.next_out = deflated;
2109 stream.avail_out = bound;
2110
2111 stream.next_in = (unsigned char *)data;
2112 stream.avail_in = size;
2113 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2114 ; /* nothing */
2115 git_deflate_end(&stream);
2116 *result_size = stream.total_out;
2117 return deflated;
2118 }
2119
2120 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2121 const char *prefix)
2122 {
2123 void *cp;
2124 void *delta;
2125 void *deflated;
2126 void *data;
2127 unsigned long orig_size;
2128 unsigned long delta_size;
2129 unsigned long deflate_size;
2130 unsigned long data_size;
2131
2132 /* We could do deflated delta, or we could do just deflated two,
2133 * whichever is smaller.
2134 */
2135 delta = NULL;
2136 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2137 if (one->size && two->size) {
2138 delta = diff_delta(one->ptr, one->size,
2139 two->ptr, two->size,
2140 &delta_size, deflate_size);
2141 if (delta) {
2142 void *to_free = delta;
2143 orig_size = delta_size;
2144 delta = deflate_it(delta, delta_size, &delta_size);
2145 free(to_free);
2146 }
2147 }
2148
2149 if (delta && delta_size < deflate_size) {
2150 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2151 free(deflated);
2152 data = delta;
2153 data_size = delta_size;
2154 }
2155 else {
2156 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2157 free(delta);
2158 data = deflated;
2159 data_size = deflate_size;
2160 }
2161
2162 /* emit data encoded in base85 */
2163 cp = data;
2164 while (data_size) {
2165 int bytes = (52 < data_size) ? 52 : data_size;
2166 char line[70];
2167 data_size -= bytes;
2168 if (bytes <= 26)
2169 line[0] = bytes + 'A' - 1;
2170 else
2171 line[0] = bytes - 26 + 'a' - 1;
2172 encode_85(line + 1, cp, bytes);
2173 cp = (char *) cp + bytes;
2174 fprintf(file, "%s", prefix);
2175 fputs(line, file);
2176 fputc('\n', file);
2177 }
2178 fprintf(file, "%s\n", prefix);
2179 free(data);
2180 }
2181
2182 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2183 const char *prefix)
2184 {
2185 fprintf(file, "%sGIT binary patch\n", prefix);
2186 emit_binary_diff_body(file, one, two, prefix);
2187 emit_binary_diff_body(file, two, one, prefix);
2188 }
2189
2190 int diff_filespec_is_binary(struct diff_filespec *one)
2191 {
2192 if (one->is_binary == -1) {
2193 diff_filespec_load_driver(one);
2194 if (one->driver->binary != -1)
2195 one->is_binary = one->driver->binary;
2196 else {
2197 if (!one->data && DIFF_FILE_VALID(one))
2198 diff_populate_filespec(one, 0);
2199 if (one->data)
2200 one->is_binary = buffer_is_binary(one->data,
2201 one->size);
2202 if (one->is_binary == -1)
2203 one->is_binary = 0;
2204 }
2205 }
2206 return one->is_binary;
2207 }
2208
2209 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2210 {
2211 diff_filespec_load_driver(one);
2212 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2213 }
2214
2215 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2216 {
2217 if (!options->a_prefix)
2218 options->a_prefix = a;
2219 if (!options->b_prefix)
2220 options->b_prefix = b;
2221 }
2222
2223 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2224 {
2225 if (!DIFF_FILE_VALID(one))
2226 return NULL;
2227
2228 diff_filespec_load_driver(one);
2229 return userdiff_get_textconv(one->driver);
2230 }
2231
2232 static void builtin_diff(const char *name_a,
2233 const char *name_b,
2234 struct diff_filespec *one,
2235 struct diff_filespec *two,
2236 const char *xfrm_msg,
2237 int must_show_header,
2238 struct diff_options *o,
2239 int complete_rewrite)
2240 {
2241 mmfile_t mf1, mf2;
2242 const char *lbl[2];
2243 char *a_one, *b_two;
2244 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2245 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2246 const char *a_prefix, *b_prefix;
2247 struct userdiff_driver *textconv_one = NULL;
2248 struct userdiff_driver *textconv_two = NULL;
2249 struct strbuf header = STRBUF_INIT;
2250 const char *line_prefix = diff_line_prefix(o);
2251
2252 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2253 (!one->mode || S_ISGITLINK(one->mode)) &&
2254 (!two->mode || S_ISGITLINK(two->mode))) {
2255 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2256 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2257 show_submodule_summary(o->file, one ? one->path : two->path,
2258 one->sha1, two->sha1, two->dirty_submodule,
2259 meta, del, add, reset);
2260 return;
2261 }
2262
2263 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2264 textconv_one = get_textconv(one);
2265 textconv_two = get_textconv(two);
2266 }
2267
2268 diff_set_mnemonic_prefix(o, "a/", "b/");
2269 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2270 a_prefix = o->b_prefix;
2271 b_prefix = o->a_prefix;
2272 } else {
2273 a_prefix = o->a_prefix;
2274 b_prefix = o->b_prefix;
2275 }
2276
2277 /* Never use a non-valid filename anywhere if at all possible */
2278 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2279 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2280
2281 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2282 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2283 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2284 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2285 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2286 if (lbl[0][0] == '/') {
2287 /* /dev/null */
2288 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2289 if (xfrm_msg)
2290 strbuf_addstr(&header, xfrm_msg);
2291 must_show_header = 1;
2292 }
2293 else if (lbl[1][0] == '/') {
2294 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2295 if (xfrm_msg)
2296 strbuf_addstr(&header, xfrm_msg);
2297 must_show_header = 1;
2298 }
2299 else {
2300 if (one->mode != two->mode) {
2301 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2302 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2303 must_show_header = 1;
2304 }
2305 if (xfrm_msg)
2306 strbuf_addstr(&header, xfrm_msg);
2307
2308 /*
2309 * we do not run diff between different kind
2310 * of objects.
2311 */
2312 if ((one->mode ^ two->mode) & S_IFMT)
2313 goto free_ab_and_return;
2314 if (complete_rewrite &&
2315 (textconv_one || !diff_filespec_is_binary(one)) &&
2316 (textconv_two || !diff_filespec_is_binary(two))) {
2317 fprintf(o->file, "%s", header.buf);
2318 strbuf_reset(&header);
2319 emit_rewrite_diff(name_a, name_b, one, two,
2320 textconv_one, textconv_two, o);
2321 o->found_changes = 1;
2322 goto free_ab_and_return;
2323 }
2324 }
2325
2326 if (o->irreversible_delete && lbl[1][0] == '/') {
2327 fprintf(o->file, "%s", header.buf);
2328 strbuf_reset(&header);
2329 goto free_ab_and_return;
2330 } else if (!DIFF_OPT_TST(o, TEXT) &&
2331 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2332 (!textconv_two && diff_filespec_is_binary(two)) )) {
2333 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2334 die("unable to read files to diff");
2335 /* Quite common confusing case */
2336 if (mf1.size == mf2.size &&
2337 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2338 if (must_show_header)
2339 fprintf(o->file, "%s", header.buf);
2340 goto free_ab_and_return;
2341 }
2342 fprintf(o->file, "%s", header.buf);
2343 strbuf_reset(&header);
2344 if (DIFF_OPT_TST(o, BINARY))
2345 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2346 else
2347 fprintf(o->file, "%sBinary files %s and %s differ\n",
2348 line_prefix, lbl[0], lbl[1]);
2349 o->found_changes = 1;
2350 } else {
2351 /* Crazy xdl interfaces.. */
2352 const char *diffopts = getenv("GIT_DIFF_OPTS");
2353 xpparam_t xpp;
2354 xdemitconf_t xecfg;
2355 struct emit_callback ecbdata;
2356 const struct userdiff_funcname *pe;
2357
2358 if (must_show_header) {
2359 fprintf(o->file, "%s", header.buf);
2360 strbuf_reset(&header);
2361 }
2362
2363 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2364 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2365
2366 pe = diff_funcname_pattern(one);
2367 if (!pe)
2368 pe = diff_funcname_pattern(two);
2369
2370 memset(&xpp, 0, sizeof(xpp));
2371 memset(&xecfg, 0, sizeof(xecfg));
2372 memset(&ecbdata, 0, sizeof(ecbdata));
2373 ecbdata.label_path = lbl;
2374 ecbdata.color_diff = want_color(o->use_color);
2375 ecbdata.found_changesp = &o->found_changes;
2376 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2377 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2378 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2379 ecbdata.opt = o;
2380 ecbdata.header = header.len ? &header : NULL;
2381 xpp.flags = o->xdl_opts;
2382 xecfg.ctxlen = o->context;
2383 xecfg.interhunkctxlen = o->interhunkcontext;
2384 xecfg.flags = XDL_EMIT_FUNCNAMES;
2385 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2386 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2387 if (pe)
2388 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2389 if (!diffopts)
2390 ;
2391 else if (!prefixcmp(diffopts, "--unified="))
2392 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2393 else if (!prefixcmp(diffopts, "-u"))
2394 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2395 if (o->word_diff)
2396 init_diff_words_data(&ecbdata, o, one, two);
2397 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2398 &xpp, &xecfg);
2399 if (o->word_diff)
2400 free_diff_words_data(&ecbdata);
2401 if (textconv_one)
2402 free(mf1.ptr);
2403 if (textconv_two)
2404 free(mf2.ptr);
2405 xdiff_clear_find_func(&xecfg);
2406 }
2407
2408 free_ab_and_return:
2409 strbuf_release(&header);
2410 diff_free_filespec_data(one);
2411 diff_free_filespec_data(two);
2412 free(a_one);
2413 free(b_two);
2414 return;
2415 }
2416
2417 static void builtin_diffstat(const char *name_a, const char *name_b,
2418 struct diff_filespec *one,
2419 struct diff_filespec *two,
2420 struct diffstat_t *diffstat,
2421 struct diff_options *o,
2422 struct diff_filepair *p)
2423 {
2424 mmfile_t mf1, mf2;
2425 struct diffstat_file *data;
2426 int same_contents;
2427 int complete_rewrite = 0;
2428
2429 if (!DIFF_PAIR_UNMERGED(p)) {
2430 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2431 complete_rewrite = 1;
2432 }
2433
2434 data = diffstat_add(diffstat, name_a, name_b);
2435 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2436
2437 if (!one || !two) {
2438 data->is_unmerged = 1;
2439 return;
2440 }
2441
2442 same_contents = !hashcmp(one->sha1, two->sha1);
2443
2444 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2445 data->is_binary = 1;
2446 if (same_contents) {
2447 data->added = 0;
2448 data->deleted = 0;
2449 } else {
2450 data->added = diff_filespec_size(two);
2451 data->deleted = diff_filespec_size(one);
2452 }
2453 }
2454
2455 else if (complete_rewrite) {
2456 diff_populate_filespec(one, 0);
2457 diff_populate_filespec(two, 0);
2458 data->deleted = count_lines(one->data, one->size);
2459 data->added = count_lines(two->data, two->size);
2460 }
2461
2462 else if (!same_contents) {
2463 /* Crazy xdl interfaces.. */
2464 xpparam_t xpp;
2465 xdemitconf_t xecfg;
2466
2467 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2468 die("unable to read files to diff");
2469
2470 memset(&xpp, 0, sizeof(xpp));
2471 memset(&xecfg, 0, sizeof(xecfg));
2472 xpp.flags = o->xdl_opts;
2473 xecfg.ctxlen = o->context;
2474 xecfg.interhunkctxlen = o->interhunkcontext;
2475 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2476 &xpp, &xecfg);
2477 }
2478
2479 diff_free_filespec_data(one);
2480 diff_free_filespec_data(two);
2481 }
2482
2483 static void builtin_checkdiff(const char *name_a, const char *name_b,
2484 const char *attr_path,
2485 struct diff_filespec *one,
2486 struct diff_filespec *two,
2487 struct diff_options *o)
2488 {
2489 mmfile_t mf1, mf2;
2490 struct checkdiff_t data;
2491
2492 if (!two)
2493 return;
2494
2495 memset(&data, 0, sizeof(data));
2496 data.filename = name_b ? name_b : name_a;
2497 data.lineno = 0;
2498 data.o = o;
2499 data.ws_rule = whitespace_rule(attr_path);
2500 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2501
2502 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2503 die("unable to read files to diff");
2504
2505 /*
2506 * All the other codepaths check both sides, but not checking
2507 * the "old" side here is deliberate. We are checking the newly
2508 * introduced changes, and as long as the "new" side is text, we
2509 * can and should check what it introduces.
2510 */
2511 if (diff_filespec_is_binary(two))
2512 goto free_and_return;
2513 else {
2514 /* Crazy xdl interfaces.. */
2515 xpparam_t xpp;
2516 xdemitconf_t xecfg;
2517
2518 memset(&xpp, 0, sizeof(xpp));
2519 memset(&xecfg, 0, sizeof(xecfg));
2520 xecfg.ctxlen = 1; /* at least one context line */
2521 xpp.flags = 0;
2522 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2523 &xpp, &xecfg);
2524
2525 if (data.ws_rule & WS_BLANK_AT_EOF) {
2526 struct emit_callback ecbdata;
2527 int blank_at_eof;
2528
2529 ecbdata.ws_rule = data.ws_rule;
2530 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2531 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2532
2533 if (blank_at_eof) {
2534 static char *err;
2535 if (!err)
2536 err = whitespace_error_string(WS_BLANK_AT_EOF);
2537 fprintf(o->file, "%s:%d: %s.\n",
2538 data.filename, blank_at_eof, err);
2539 data.status = 1; /* report errors */
2540 }
2541 }
2542 }
2543 free_and_return:
2544 diff_free_filespec_data(one);
2545 diff_free_filespec_data(two);
2546 if (data.status)
2547 DIFF_OPT_SET(o, CHECK_FAILED);
2548 }
2549
2550 struct diff_filespec *alloc_filespec(const char *path)
2551 {
2552 int namelen = strlen(path);
2553 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2554
2555 memset(spec, 0, sizeof(*spec));
2556 spec->path = (char *)(spec + 1);
2557 memcpy(spec->path, path, namelen+1);
2558 spec->count = 1;
2559 spec->is_binary = -1;
2560 return spec;
2561 }
2562
2563 void free_filespec(struct diff_filespec *spec)
2564 {
2565 if (!--spec->count) {
2566 diff_free_filespec_data(spec);
2567 free(spec);
2568 }
2569 }
2570
2571 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2572 int sha1_valid, unsigned short mode)
2573 {
2574 if (mode) {
2575 spec->mode = canon_mode(mode);
2576 hashcpy(spec->sha1, sha1);
2577 spec->sha1_valid = sha1_valid;
2578 }
2579 }
2580
2581 /*
2582 * Given a name and sha1 pair, if the index tells us the file in
2583 * the work tree has that object contents, return true, so that
2584 * prepare_temp_file() does not have to inflate and extract.
2585 */
2586 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2587 {
2588 struct cache_entry *ce;
2589 struct stat st;
2590 int pos, len;
2591
2592 /*
2593 * We do not read the cache ourselves here, because the
2594 * benchmark with my previous version that always reads cache
2595 * shows that it makes things worse for diff-tree comparing
2596 * two linux-2.6 kernel trees in an already checked out work
2597 * tree. This is because most diff-tree comparisons deal with
2598 * only a small number of files, while reading the cache is
2599 * expensive for a large project, and its cost outweighs the
2600 * savings we get by not inflating the object to a temporary
2601 * file. Practically, this code only helps when we are used
2602 * by diff-cache --cached, which does read the cache before
2603 * calling us.
2604 */
2605 if (!active_cache)
2606 return 0;
2607
2608 /* We want to avoid the working directory if our caller
2609 * doesn't need the data in a normal file, this system
2610 * is rather slow with its stat/open/mmap/close syscalls,
2611 * and the object is contained in a pack file. The pack
2612 * is probably already open and will be faster to obtain
2613 * the data through than the working directory. Loose
2614 * objects however would tend to be slower as they need
2615 * to be individually opened and inflated.
2616 */
2617 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2618 return 0;
2619
2620 len = strlen(name);
2621 pos = cache_name_pos(name, len);
2622 if (pos < 0)
2623 return 0;
2624 ce = active_cache[pos];
2625
2626 /*
2627 * This is not the sha1 we are looking for, or
2628 * unreusable because it is not a regular file.
2629 */
2630 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2631 return 0;
2632
2633 /*
2634 * If ce is marked as "assume unchanged", there is no
2635 * guarantee that work tree matches what we are looking for.
2636 */
2637 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2638 return 0;
2639
2640 /*
2641 * If ce matches the file in the work tree, we can reuse it.
2642 */
2643 if (ce_uptodate(ce) ||
2644 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2645 return 1;
2646
2647 return 0;
2648 }
2649
2650 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2651 {
2652 int len;
2653 char *data = xmalloc(100), *dirty = "";
2654
2655 /* Are we looking at the work tree? */
2656 if (s->dirty_submodule)
2657 dirty = "-dirty";
2658
2659 len = snprintf(data, 100,
2660 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2661 s->data = data;
2662 s->size = len;
2663 s->should_free = 1;
2664 if (size_only) {
2665 s->data = NULL;
2666 free(data);
2667 }
2668 return 0;
2669 }
2670
2671 /*
2672 * While doing rename detection and pickaxe operation, we may need to
2673 * grab the data for the blob (or file) for our own in-core comparison.
2674 * diff_filespec has data and size fields for this purpose.
2675 */
2676 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2677 {
2678 int err = 0;
2679 if (!DIFF_FILE_VALID(s))
2680 die("internal error: asking to populate invalid file.");
2681 if (S_ISDIR(s->mode))
2682 return -1;
2683
2684 if (s->data)
2685 return 0;
2686
2687 if (size_only && 0 < s->size)
2688 return 0;
2689
2690 if (S_ISGITLINK(s->mode))
2691 return diff_populate_gitlink(s, size_only);
2692
2693 if (!s->sha1_valid ||
2694 reuse_worktree_file(s->path, s->sha1, 0)) {
2695 struct strbuf buf = STRBUF_INIT;
2696 struct stat st;
2697 int fd;
2698
2699 if (lstat(s->path, &st) < 0) {
2700 if (errno == ENOENT) {
2701 err_empty:
2702 err = -1;
2703 empty:
2704 s->data = (char *)"";
2705 s->size = 0;
2706 return err;
2707 }
2708 }
2709 s->size = xsize_t(st.st_size);
2710 if (!s->size)
2711 goto empty;
2712 if (S_ISLNK(st.st_mode)) {
2713 struct strbuf sb = STRBUF_INIT;
2714
2715 if (strbuf_readlink(&sb, s->path, s->size))
2716 goto err_empty;
2717 s->size = sb.len;
2718 s->data = strbuf_detach(&sb, NULL);
2719 s->should_free = 1;
2720 return 0;
2721 }
2722 if (size_only)
2723 return 0;
2724 fd = open(s->path, O_RDONLY);
2725 if (fd < 0)
2726 goto err_empty;
2727 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2728 close(fd);
2729 s->should_munmap = 1;
2730
2731 /*
2732 * Convert from working tree format to canonical git format
2733 */
2734 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2735 size_t size = 0;
2736 munmap(s->data, s->size);
2737 s->should_munmap = 0;
2738 s->data = strbuf_detach(&buf, &size);
2739 s->size = size;
2740 s->should_free = 1;
2741 }
2742 }
2743 else {
2744 enum object_type type;
2745 if (size_only) {
2746 type = sha1_object_info(s->sha1, &s->size);
2747 if (type < 0)
2748 die("unable to read %s", sha1_to_hex(s->sha1));
2749 } else {
2750 s->data = read_sha1_file(s->sha1, &type, &s->size);
2751 if (!s->data)
2752 die("unable to read %s", sha1_to_hex(s->sha1));
2753 s->should_free = 1;
2754 }
2755 }
2756 return 0;
2757 }
2758
2759 void diff_free_filespec_blob(struct diff_filespec *s)
2760 {
2761 if (s->should_free)
2762 free(s->data);
2763 else if (s->should_munmap)
2764 munmap(s->data, s->size);
2765
2766 if (s->should_free || s->should_munmap) {
2767 s->should_free = s->should_munmap = 0;
2768 s->data = NULL;
2769 }
2770 }
2771
2772 void diff_free_filespec_data(struct diff_filespec *s)
2773 {
2774 diff_free_filespec_blob(s);
2775 free(s->cnt_data);
2776 s->cnt_data = NULL;
2777 }
2778
2779 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2780 void *blob,
2781 unsigned long size,
2782 const unsigned char *sha1,
2783 int mode)
2784 {
2785 int fd;
2786 struct strbuf buf = STRBUF_INIT;
2787 struct strbuf template = STRBUF_INIT;
2788 char *path_dup = xstrdup(path);
2789 const char *base = basename(path_dup);
2790
2791 /* Generate "XXXXXX_basename.ext" */
2792 strbuf_addstr(&template, "XXXXXX_");
2793 strbuf_addstr(&template, base);
2794
2795 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2796 strlen(base) + 1);
2797 if (fd < 0)
2798 die_errno("unable to create temp-file");
2799 if (convert_to_working_tree(path,
2800 (const char *)blob, (size_t)size, &buf)) {
2801 blob = buf.buf;
2802 size = buf.len;
2803 }
2804 if (write_in_full(fd, blob, size) != size)
2805 die_errno("unable to write temp-file");
2806 close(fd);
2807 temp->name = temp->tmp_path;
2808 strcpy(temp->hex, sha1_to_hex(sha1));
2809 temp->hex[40] = 0;
2810 sprintf(temp->mode, "%06o", mode);
2811 strbuf_release(&buf);
2812 strbuf_release(&template);
2813 free(path_dup);
2814 }
2815
2816 static struct diff_tempfile *prepare_temp_file(const char *name,
2817 struct diff_filespec *one)
2818 {
2819 struct diff_tempfile *temp = claim_diff_tempfile();
2820
2821 if (!DIFF_FILE_VALID(one)) {
2822 not_a_valid_file:
2823 /* A '-' entry produces this for file-2, and
2824 * a '+' entry produces this for file-1.
2825 */
2826 temp->name = "/dev/null";
2827 strcpy(temp->hex, ".");
2828 strcpy(temp->mode, ".");
2829 return temp;
2830 }
2831
2832 if (!remove_tempfile_installed) {
2833 atexit(remove_tempfile);
2834 sigchain_push_common(remove_tempfile_on_signal);
2835 remove_tempfile_installed = 1;
2836 }
2837
2838 if (!one->sha1_valid ||
2839 reuse_worktree_file(name, one->sha1, 1)) {
2840 struct stat st;
2841 if (lstat(name, &st) < 0) {
2842 if (errno == ENOENT)
2843 goto not_a_valid_file;
2844 die_errno("stat(%s)", name);
2845 }
2846 if (S_ISLNK(st.st_mode)) {
2847 struct strbuf sb = STRBUF_INIT;
2848 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2849 die_errno("readlink(%s)", name);
2850 prep_temp_blob(name, temp, sb.buf, sb.len,
2851 (one->sha1_valid ?
2852 one->sha1 : null_sha1),
2853 (one->sha1_valid ?
2854 one->mode : S_IFLNK));
2855 strbuf_release(&sb);
2856 }
2857 else {
2858 /* we can borrow from the file in the work tree */
2859 temp->name = name;
2860 if (!one->sha1_valid)
2861 strcpy(temp->hex, sha1_to_hex(null_sha1));
2862 else
2863 strcpy(temp->hex, sha1_to_hex(one->sha1));
2864 /* Even though we may sometimes borrow the
2865 * contents from the work tree, we always want
2866 * one->mode. mode is trustworthy even when
2867 * !(one->sha1_valid), as long as
2868 * DIFF_FILE_VALID(one).
2869 */
2870 sprintf(temp->mode, "%06o", one->mode);
2871 }
2872 return temp;
2873 }
2874 else {
2875 if (diff_populate_filespec(one, 0))
2876 die("cannot read data blob for %s", one->path);
2877 prep_temp_blob(name, temp, one->data, one->size,
2878 one->sha1, one->mode);
2879 }
2880 return temp;
2881 }
2882
2883 /* An external diff command takes:
2884 *
2885 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2886 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2887 *
2888 */
2889 static void run_external_diff(const char *pgm,
2890 const char *name,
2891 const char *other,
2892 struct diff_filespec *one,
2893 struct diff_filespec *two,
2894 const char *xfrm_msg,
2895 int complete_rewrite)
2896 {
2897 const char *spawn_arg[10];
2898 int retval;
2899 const char **arg = &spawn_arg[0];
2900
2901 if (one && two) {
2902 struct diff_tempfile *temp_one, *temp_two;
2903 const char *othername = (other ? other : name);
2904 temp_one = prepare_temp_file(name, one);
2905 temp_two = prepare_temp_file(othername, two);
2906 *arg++ = pgm;
2907 *arg++ = name;
2908 *arg++ = temp_one->name;
2909 *arg++ = temp_one->hex;
2910 *arg++ = temp_one->mode;
2911 *arg++ = temp_two->name;
2912 *arg++ = temp_two->hex;
2913 *arg++ = temp_two->mode;
2914 if (other) {
2915 *arg++ = other;
2916 *arg++ = xfrm_msg;
2917 }
2918 } else {
2919 *arg++ = pgm;
2920 *arg++ = name;
2921 }
2922 *arg = NULL;
2923 fflush(NULL);
2924 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2925 remove_tempfile();
2926 if (retval) {
2927 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2928 exit(1);
2929 }
2930 }
2931
2932 static int similarity_index(struct diff_filepair *p)
2933 {
2934 return p->score * 100 / MAX_SCORE;
2935 }
2936
2937 static void fill_metainfo(struct strbuf *msg,
2938 const char *name,
2939 const char *other,
2940 struct diff_filespec *one,
2941 struct diff_filespec *two,
2942 struct diff_options *o,
2943 struct diff_filepair *p,
2944 int *must_show_header,
2945 int use_color)
2946 {
2947 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2948 const char *reset = diff_get_color(use_color, DIFF_RESET);
2949 const char *line_prefix = diff_line_prefix(o);
2950
2951 *must_show_header = 1;
2952 strbuf_init(msg, PATH_MAX * 2 + 300);
2953 switch (p->status) {
2954 case DIFF_STATUS_COPIED:
2955 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2956 line_prefix, set, similarity_index(p));
2957 strbuf_addf(msg, "%s\n%s%scopy from ",
2958 reset, line_prefix, set);
2959 quote_c_style(name, msg, NULL, 0);
2960 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2961 quote_c_style(other, msg, NULL, 0);
2962 strbuf_addf(msg, "%s\n", reset);
2963 break;
2964 case DIFF_STATUS_RENAMED:
2965 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2966 line_prefix, set, similarity_index(p));
2967 strbuf_addf(msg, "%s\n%s%srename from ",
2968 reset, line_prefix, set);
2969 quote_c_style(name, msg, NULL, 0);
2970 strbuf_addf(msg, "%s\n%s%srename to ",
2971 reset, line_prefix, set);
2972 quote_c_style(other, msg, NULL, 0);
2973 strbuf_addf(msg, "%s\n", reset);
2974 break;
2975 case DIFF_STATUS_MODIFIED:
2976 if (p->score) {
2977 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2978 line_prefix,
2979 set, similarity_index(p), reset);
2980 break;
2981 }
2982 /* fallthru */
2983 default:
2984 *must_show_header = 0;
2985 }
2986 if (one && two && hashcmp(one->sha1, two->sha1)) {
2987 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2988
2989 if (DIFF_OPT_TST(o, BINARY)) {
2990 mmfile_t mf;
2991 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2992 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2993 abbrev = 40;
2994 }
2995 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2996 find_unique_abbrev(one->sha1, abbrev));
2997 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2998 if (one->mode == two->mode)
2999 strbuf_addf(msg, " %06o", one->mode);
3000 strbuf_addf(msg, "%s\n", reset);
3001 }
3002 }
3003
3004 static void run_diff_cmd(const char *pgm,
3005 const char *name,
3006 const char *other,
3007 const char *attr_path,
3008 struct diff_filespec *one,
3009 struct diff_filespec *two,
3010 struct strbuf *msg,
3011 struct diff_options *o,
3012 struct diff_filepair *p)
3013 {
3014 const char *xfrm_msg = NULL;
3015 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3016 int must_show_header = 0;
3017
3018
3019 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3020 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3021 if (drv && drv->external)
3022 pgm = drv->external;
3023 }
3024
3025 if (msg) {
3026 /*
3027 * don't use colors when the header is intended for an
3028 * external diff driver
3029 */
3030 fill_metainfo(msg, name, other, one, two, o, p,
3031 &must_show_header,
3032 want_color(o->use_color) && !pgm);
3033 xfrm_msg = msg->len ? msg->buf : NULL;
3034 }
3035
3036 if (pgm) {
3037 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3038 complete_rewrite);
3039 return;
3040 }
3041 if (one && two)
3042 builtin_diff(name, other ? other : name,
3043 one, two, xfrm_msg, must_show_header,
3044 o, complete_rewrite);
3045 else
3046 fprintf(o->file, "* Unmerged path %s\n", name);
3047 }
3048
3049 static void diff_fill_sha1_info(struct diff_filespec *one)
3050 {
3051 if (DIFF_FILE_VALID(one)) {
3052 if (!one->sha1_valid) {
3053 struct stat st;
3054 if (one->is_stdin) {
3055 hashcpy(one->sha1, null_sha1);
3056 return;
3057 }
3058 if (lstat(one->path, &st) < 0)
3059 die_errno("stat '%s'", one->path);
3060 if (index_path(one->sha1, one->path, &st, 0))
3061 die("cannot hash %s", one->path);
3062 }
3063 }
3064 else
3065 hashclr(one->sha1);
3066 }
3067
3068 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3069 {
3070 /* Strip the prefix but do not molest /dev/null and absolute paths */
3071 if (*namep && **namep != '/') {
3072 *namep += prefix_length;
3073 if (**namep == '/')
3074 ++*namep;
3075 }
3076 if (*otherp && **otherp != '/') {
3077 *otherp += prefix_length;
3078 if (**otherp == '/')
3079 ++*otherp;
3080 }
3081 }
3082
3083 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3084 {
3085 const char *pgm = external_diff();
3086 struct strbuf msg;
3087 struct diff_filespec *one = p->one;
3088 struct diff_filespec *two = p->two;
3089 const char *name;
3090 const char *other;
3091 const char *attr_path;
3092
3093 name = p->one->path;
3094 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3095 attr_path = name;
3096 if (o->prefix_length)
3097 strip_prefix(o->prefix_length, &name, &other);
3098
3099 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3100 pgm = NULL;
3101
3102 if (DIFF_PAIR_UNMERGED(p)) {
3103 run_diff_cmd(pgm, name, NULL, attr_path,
3104 NULL, NULL, NULL, o, p);
3105 return;
3106 }
3107
3108 diff_fill_sha1_info(one);
3109 diff_fill_sha1_info(two);
3110
3111 if (!pgm &&
3112 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3113 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3114 /*
3115 * a filepair that changes between file and symlink
3116 * needs to be split into deletion and creation.
3117 */
3118 struct diff_filespec *null = alloc_filespec(two->path);
3119 run_diff_cmd(NULL, name, other, attr_path,
3120 one, null, &msg, o, p);
3121 free(null);
3122 strbuf_release(&msg);
3123
3124 null = alloc_filespec(one->path);
3125 run_diff_cmd(NULL, name, other, attr_path,
3126 null, two, &msg, o, p);
3127 free(null);
3128 }
3129 else
3130 run_diff_cmd(pgm, name, other, attr_path,
3131 one, two, &msg, o, p);
3132
3133 strbuf_release(&msg);
3134 }
3135
3136 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3137 struct diffstat_t *diffstat)
3138 {
3139 const char *name;
3140 const char *other;
3141
3142 if (DIFF_PAIR_UNMERGED(p)) {
3143 /* unmerged */
3144 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3145 return;
3146 }
3147
3148 name = p->one->path;
3149 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3150
3151 if (o->prefix_length)
3152 strip_prefix(o->prefix_length, &name, &other);
3153
3154 diff_fill_sha1_info(p->one);
3155 diff_fill_sha1_info(p->two);
3156
3157 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3158 }
3159
3160 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3161 {
3162 const char *name;
3163 const char *other;
3164 const char *attr_path;
3165
3166 if (DIFF_PAIR_UNMERGED(p)) {
3167 /* unmerged */
3168 return;
3169 }
3170
3171 name = p->one->path;
3172 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3173 attr_path = other ? other : name;
3174
3175 if (o->prefix_length)
3176 strip_prefix(o->prefix_length, &name, &other);
3177
3178 diff_fill_sha1_info(p->one);
3179 diff_fill_sha1_info(p->two);
3180
3181 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3182 }
3183
3184 void diff_setup(struct diff_options *options)
3185 {
3186 memcpy(options, &default_diff_options, sizeof(*options));
3187
3188 options->file = stdout;
3189
3190 options->line_termination = '\n';
3191 options->break_opt = -1;
3192 options->rename_limit = -1;
3193 options->dirstat_permille = diff_dirstat_permille_default;
3194 options->context = diff_context_default;
3195 DIFF_OPT_SET(options, RENAME_EMPTY);
3196
3197 options->change = diff_change;
3198 options->add_remove = diff_addremove;
3199 options->use_color = diff_use_color_default;
3200 options->detect_rename = diff_detect_rename_default;
3201 options->xdl_opts |= diff_algorithm;
3202
3203 if (diff_no_prefix) {
3204 options->a_prefix = options->b_prefix = "";
3205 } else if (!diff_mnemonic_prefix) {
3206 options->a_prefix = "a/";
3207 options->b_prefix = "b/";
3208 }
3209 }
3210
3211 void diff_setup_done(struct diff_options *options)
3212 {
3213 int count = 0;
3214
3215 if (options->output_format & DIFF_FORMAT_NAME)
3216 count++;
3217 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3218 count++;
3219 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3220 count++;
3221 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3222 count++;
3223 if (count > 1)
3224 die("--name-only, --name-status, --check and -s are mutually exclusive");
3225
3226 /*
3227 * Most of the time we can say "there are changes"
3228 * only by checking if there are changed paths, but
3229 * --ignore-whitespace* options force us to look
3230 * inside contents.
3231 */
3232
3233 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3234 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3235 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3236 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3237 else
3238 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3239
3240 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3241 options->detect_rename = DIFF_DETECT_COPY;
3242
3243 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3244 options->prefix = NULL;
3245 if (options->prefix)
3246 options->prefix_length = strlen(options->prefix);
3247 else
3248 options->prefix_length = 0;
3249
3250 if (options->output_format & (DIFF_FORMAT_NAME |
3251 DIFF_FORMAT_NAME_STATUS |
3252 DIFF_FORMAT_CHECKDIFF |
3253 DIFF_FORMAT_NO_OUTPUT))
3254 options->output_format &= ~(DIFF_FORMAT_RAW |
3255 DIFF_FORMAT_NUMSTAT |
3256 DIFF_FORMAT_DIFFSTAT |
3257 DIFF_FORMAT_SHORTSTAT |
3258 DIFF_FORMAT_DIRSTAT |
3259 DIFF_FORMAT_SUMMARY |
3260 DIFF_FORMAT_PATCH);
3261
3262 /*
3263 * These cases always need recursive; we do not drop caller-supplied
3264 * recursive bits for other formats here.
3265 */
3266 if (options->output_format & (DIFF_FORMAT_PATCH |
3267 DIFF_FORMAT_NUMSTAT |
3268 DIFF_FORMAT_DIFFSTAT |
3269 DIFF_FORMAT_SHORTSTAT |
3270 DIFF_FORMAT_DIRSTAT |
3271 DIFF_FORMAT_SUMMARY |
3272 DIFF_FORMAT_CHECKDIFF))
3273 DIFF_OPT_SET(options, RECURSIVE);
3274 /*
3275 * Also pickaxe would not work very well if you do not say recursive
3276 */
3277 if (options->pickaxe)
3278 DIFF_OPT_SET(options, RECURSIVE);
3279 /*
3280 * When patches are generated, submodules diffed against the work tree
3281 * must be checked for dirtiness too so it can be shown in the output
3282 */
3283 if (options->output_format & DIFF_FORMAT_PATCH)
3284 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3285
3286 if (options->detect_rename && options->rename_limit < 0)
3287 options->rename_limit = diff_rename_limit_default;
3288 if (options->setup & DIFF_SETUP_USE_CACHE) {
3289 if (!active_cache)
3290 /* read-cache does not die even when it fails
3291 * so it is safe for us to do this here. Also
3292 * it does not smudge active_cache or active_nr
3293 * when it fails, so we do not have to worry about
3294 * cleaning it up ourselves either.
3295 */
3296 read_cache();
3297 }
3298 if (options->abbrev <= 0 || 40 < options->abbrev)
3299 options->abbrev = 40; /* full */
3300
3301 /*
3302 * It does not make sense to show the first hit we happened
3303 * to have found. It does not make sense not to return with
3304 * exit code in such a case either.
3305 */
3306 if (DIFF_OPT_TST(options, QUICK)) {
3307 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3308 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3309 }
3310 }
3311
3312 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3313 {
3314 char c, *eq;
3315 int len;
3316
3317 if (*arg != '-')
3318 return 0;
3319 c = *++arg;
3320 if (!c)
3321 return 0;
3322 if (c == arg_short) {
3323 c = *++arg;
3324 if (!c)
3325 return 1;
3326 if (val && isdigit(c)) {
3327 char *end;
3328 int n = strtoul(arg, &end, 10);
3329 if (*end)
3330 return 0;
3331 *val = n;
3332 return 1;
3333 }
3334 return 0;
3335 }
3336 if (c != '-')
3337 return 0;
3338 arg++;
3339 eq = strchr(arg, '=');
3340 if (eq)
3341 len = eq - arg;
3342 else
3343 len = strlen(arg);
3344 if (!len || strncmp(arg, arg_long, len))
3345 return 0;
3346 if (eq) {
3347 int n;
3348 char *end;
3349 if (!isdigit(*++eq))
3350 return 0;
3351 n = strtoul(eq, &end, 10);
3352 if (*end)
3353 return 0;
3354 *val = n;
3355 }
3356 return 1;
3357 }
3358
3359 static int diff_scoreopt_parse(const char *opt);
3360
3361 static inline int short_opt(char opt, const char **argv,
3362 const char **optarg)
3363 {
3364 const char *arg = argv[0];
3365 if (arg[0] != '-' || arg[1] != opt)
3366 return 0;
3367 if (arg[2] != '\0') {
3368 *optarg = arg + 2;
3369 return 1;
3370 }
3371 if (!argv[1])
3372 die("Option '%c' requires a value", opt);
3373 *optarg = argv[1];
3374 return 2;
3375 }
3376
3377 int parse_long_opt(const char *opt, const char **argv,
3378 const char **optarg)
3379 {
3380 const char *arg = argv[0];
3381 if (arg[0] != '-' || arg[1] != '-')
3382 return 0;
3383 arg += strlen("--");
3384 if (prefixcmp(arg, opt))
3385 return 0;
3386 arg += strlen(opt);
3387 if (*arg == '=') { /* sticked form: --option=value */
3388 *optarg = arg + 1;
3389 return 1;
3390 }
3391 if (*arg != '\0')
3392 return 0;
3393 /* separate form: --option value */
3394 if (!argv[1])
3395 die("Option '--%s' requires a value", opt);
3396 *optarg = argv[1];
3397 return 2;
3398 }
3399
3400 static int stat_opt(struct diff_options *options, const char **av)
3401 {
3402 const char *arg = av[0];
3403 char *end;
3404 int width = options->stat_width;
3405 int name_width = options->stat_name_width;
3406 int graph_width = options->stat_graph_width;
3407 int count = options->stat_count;
3408 int argcount = 1;
3409
3410 arg += strlen("--stat");
3411 end = (char *)arg;
3412
3413 switch (*arg) {
3414 case '-':
3415 if (!prefixcmp(arg, "-width")) {
3416 arg += strlen("-width");
3417 if (*arg == '=')
3418 width = strtoul(arg + 1, &end, 10);
3419 else if (!*arg && !av[1])
3420 die("Option '--stat-width' requires a value");
3421 else if (!*arg) {
3422 width = strtoul(av[1], &end, 10);
3423 argcount = 2;
3424 }
3425 } else if (!prefixcmp(arg, "-name-width")) {
3426 arg += strlen("-name-width");
3427 if (*arg == '=')
3428 name_width = strtoul(arg + 1, &end, 10);
3429 else if (!*arg && !av[1])
3430 die("Option '--stat-name-width' requires a value");
3431 else if (!*arg) {
3432 name_width = strtoul(av[1], &end, 10);
3433 argcount = 2;
3434 }
3435 } else if (!prefixcmp(arg, "-graph-width")) {
3436 arg += strlen("-graph-width");
3437 if (*arg == '=')
3438 graph_width = strtoul(arg + 1, &end, 10);
3439 else if (!*arg && !av[1])
3440 die("Option '--stat-graph-width' requires a value");
3441 else if (!*arg) {
3442 graph_width = strtoul(av[1], &end, 10);
3443 argcount = 2;
3444 }
3445 } else if (!prefixcmp(arg, "-count")) {
3446 arg += strlen("-count");
3447 if (*arg == '=')
3448 count = strtoul(arg + 1, &end, 10);
3449 else if (!*arg && !av[1])
3450 die("Option '--stat-count' requires a value");
3451 else if (!*arg) {
3452 count = strtoul(av[1], &end, 10);
3453 argcount = 2;
3454 }
3455 }
3456 break;
3457 case '=':
3458 width = strtoul(arg+1, &end, 10);
3459 if (*end == ',')
3460 name_width = strtoul(end+1, &end, 10);
3461 if (*end == ',')
3462 count = strtoul(end+1, &end, 10);
3463 }
3464
3465 /* Important! This checks all the error cases! */
3466 if (*end)
3467 return 0;
3468 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3469 options->stat_name_width = name_width;
3470 options->stat_graph_width = graph_width;
3471 options->stat_width = width;
3472 options->stat_count = count;
3473 return argcount;
3474 }
3475
3476 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3477 {
3478 struct strbuf errmsg = STRBUF_INIT;
3479 if (parse_dirstat_params(options, params, &errmsg))
3480 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3481 errmsg.buf);
3482 strbuf_release(&errmsg);
3483 /*
3484 * The caller knows a dirstat-related option is given from the command
3485 * line; allow it to say "return this_function();"
3486 */
3487 options->output_format |= DIFF_FORMAT_DIRSTAT;
3488 return 1;
3489 }
3490
3491 static int parse_submodule_opt(struct diff_options *options, const char *value)
3492 {
3493 if (parse_submodule_params(options, value))
3494 die(_("Failed to parse --submodule option parameter: '%s'"),
3495 value);
3496 return 1;
3497 }
3498
3499 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3500 {
3501 const char *arg = av[0];
3502 const char *optarg;
3503 int argcount;
3504
3505 /* Output format options */
3506 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3507 options->output_format |= DIFF_FORMAT_PATCH;
3508 else if (opt_arg(arg, 'U', "unified", &options->context))
3509 options->output_format |= DIFF_FORMAT_PATCH;
3510 else if (!strcmp(arg, "--raw"))
3511 options->output_format |= DIFF_FORMAT_RAW;
3512 else if (!strcmp(arg, "--patch-with-raw"))
3513 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3514 else if (!strcmp(arg, "--numstat"))
3515 options->output_format |= DIFF_FORMAT_NUMSTAT;
3516 else if (!strcmp(arg, "--shortstat"))
3517 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3518 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3519 return parse_dirstat_opt(options, "");
3520 else if (!prefixcmp(arg, "-X"))
3521 return parse_dirstat_opt(options, arg + 2);
3522 else if (!prefixcmp(arg, "--dirstat="))
3523 return parse_dirstat_opt(options, arg + 10);
3524 else if (!strcmp(arg, "--cumulative"))
3525 return parse_dirstat_opt(options, "cumulative");
3526 else if (!strcmp(arg, "--dirstat-by-file"))
3527 return parse_dirstat_opt(options, "files");
3528 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3529 parse_dirstat_opt(options, "files");
3530 return parse_dirstat_opt(options, arg + 18);
3531 }
3532 else if (!strcmp(arg, "--check"))
3533 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3534 else if (!strcmp(arg, "--summary"))
3535 options->output_format |= DIFF_FORMAT_SUMMARY;
3536 else if (!strcmp(arg, "--patch-with-stat"))
3537 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3538 else if (!strcmp(arg, "--name-only"))
3539 options->output_format |= DIFF_FORMAT_NAME;
3540 else if (!strcmp(arg, "--name-status"))
3541 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3542 else if (!strcmp(arg, "-s"))
3543 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3544 else if (!prefixcmp(arg, "--stat"))
3545 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3546 return stat_opt(options, av);
3547
3548 /* renames options */
3549 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3550 !strcmp(arg, "--break-rewrites")) {
3551 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3552 return error("invalid argument to -B: %s", arg+2);
3553 }
3554 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3555 !strcmp(arg, "--find-renames")) {
3556 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3557 return error("invalid argument to -M: %s", arg+2);
3558 options->detect_rename = DIFF_DETECT_RENAME;
3559 }
3560 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3561 options->irreversible_delete = 1;
3562 }
3563 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3564 !strcmp(arg, "--find-copies")) {
3565 if (options->detect_rename == DIFF_DETECT_COPY)
3566 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3567 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3568 return error("invalid argument to -C: %s", arg+2);
3569 options->detect_rename = DIFF_DETECT_COPY;
3570 }
3571 else if (!strcmp(arg, "--no-renames"))
3572 options->detect_rename = 0;
3573 else if (!strcmp(arg, "--rename-empty"))
3574 DIFF_OPT_SET(options, RENAME_EMPTY);
3575 else if (!strcmp(arg, "--no-rename-empty"))
3576 DIFF_OPT_CLR(options, RENAME_EMPTY);
3577 else if (!strcmp(arg, "--relative"))
3578 DIFF_OPT_SET(options, RELATIVE_NAME);
3579 else if (!prefixcmp(arg, "--relative=")) {
3580 DIFF_OPT_SET(options, RELATIVE_NAME);
3581 options->prefix = arg + 11;
3582 }
3583
3584 /* xdiff options */
3585 else if (!strcmp(arg, "--minimal"))
3586 DIFF_XDL_SET(options, NEED_MINIMAL);
3587 else if (!strcmp(arg, "--no-minimal"))
3588 DIFF_XDL_CLR(options, NEED_MINIMAL);
3589 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3590 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3591 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3592 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3593 else if (!strcmp(arg, "--ignore-space-at-eol"))
3594 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3595 else if (!strcmp(arg, "--patience"))
3596 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3597 else if (!strcmp(arg, "--histogram"))
3598 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3599 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3600 long value = parse_algorithm_value(optarg);
3601 if (value < 0)
3602 return error("option diff-algorithm accepts \"myers\", "
3603 "\"minimal\", \"patience\" and \"histogram\"");
3604 /* clear out previous settings */
3605 DIFF_XDL_CLR(options, NEED_MINIMAL);
3606 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3607 options->xdl_opts |= value;
3608 return argcount;
3609 }
3610
3611 /* flags options */
3612 else if (!strcmp(arg, "--binary")) {
3613 options->output_format |= DIFF_FORMAT_PATCH;
3614 DIFF_OPT_SET(options, BINARY);
3615 }
3616 else if (!strcmp(arg, "--full-index"))
3617 DIFF_OPT_SET(options, FULL_INDEX);
3618 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3619 DIFF_OPT_SET(options, TEXT);
3620 else if (!strcmp(arg, "-R"))
3621 DIFF_OPT_SET(options, REVERSE_DIFF);
3622 else if (!strcmp(arg, "--find-copies-harder"))
3623 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3624 else if (!strcmp(arg, "--follow"))
3625 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3626 else if (!strcmp(arg, "--no-follow"))
3627 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3628 else if (!strcmp(arg, "--color"))
3629 options->use_color = 1;
3630 else if (!prefixcmp(arg, "--color=")) {
3631 int value = git_config_colorbool(NULL, arg+8);
3632 if (value < 0)
3633 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3634 options->use_color = value;
3635 }
3636 else if (!strcmp(arg, "--no-color"))
3637 options->use_color = 0;
3638 else if (!strcmp(arg, "--color-words")) {
3639 options->use_color = 1;
3640 options->word_diff = DIFF_WORDS_COLOR;
3641 }
3642 else if (!prefixcmp(arg, "--color-words=")) {
3643 options->use_color = 1;
3644 options->word_diff = DIFF_WORDS_COLOR;
3645 options->word_regex = arg + 14;
3646 }
3647 else if (!strcmp(arg, "--word-diff")) {
3648 if (options->word_diff == DIFF_WORDS_NONE)
3649 options->word_diff = DIFF_WORDS_PLAIN;
3650 }
3651 else if (!prefixcmp(arg, "--word-diff=")) {
3652 const char *type = arg + 12;
3653 if (!strcmp(type, "plain"))
3654 options->word_diff = DIFF_WORDS_PLAIN;
3655 else if (!strcmp(type, "color")) {
3656 options->use_color = 1;
3657 options->word_diff = DIFF_WORDS_COLOR;
3658 }
3659 else if (!strcmp(type, "porcelain"))
3660 options->word_diff = DIFF_WORDS_PORCELAIN;
3661 else if (!strcmp(type, "none"))
3662 options->word_diff = DIFF_WORDS_NONE;
3663 else
3664 die("bad --word-diff argument: %s", type);
3665 }
3666 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3667 if (options->word_diff == DIFF_WORDS_NONE)
3668 options->word_diff = DIFF_WORDS_PLAIN;
3669 options->word_regex = optarg;
3670 return argcount;
3671 }
3672 else if (!strcmp(arg, "--exit-code"))
3673 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3674 else if (!strcmp(arg, "--quiet"))
3675 DIFF_OPT_SET(options, QUICK);
3676 else if (!strcmp(arg, "--ext-diff"))
3677 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3678 else if (!strcmp(arg, "--no-ext-diff"))
3679 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3680 else if (!strcmp(arg, "--textconv"))
3681 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3682 else if (!strcmp(arg, "--no-textconv"))
3683 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3684 else if (!strcmp(arg, "--ignore-submodules")) {
3685 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3686 handle_ignore_submodules_arg(options, "all");
3687 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3688 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3689 handle_ignore_submodules_arg(options, arg + 20);
3690 } else if (!strcmp(arg, "--submodule"))
3691 DIFF_OPT_SET(options, SUBMODULE_LOG);
3692 else if (!prefixcmp(arg, "--submodule="))
3693 return parse_submodule_opt(options, arg + 12);
3694
3695 /* misc options */
3696 else if (!strcmp(arg, "-z"))
3697 options->line_termination = 0;
3698 else if ((argcount = short_opt('l', av, &optarg))) {
3699 options->rename_limit = strtoul(optarg, NULL, 10);
3700 return argcount;
3701 }
3702 else if ((argcount = short_opt('S', av, &optarg))) {
3703 options->pickaxe = optarg;
3704 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3705 return argcount;
3706 } else if ((argcount = short_opt('G', av, &optarg))) {
3707 options->pickaxe = optarg;
3708 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3709 return argcount;
3710 }
3711 else if (!strcmp(arg, "--pickaxe-all"))
3712 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3713 else if (!strcmp(arg, "--pickaxe-regex"))
3714 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3715 else if ((argcount = short_opt('O', av, &optarg))) {
3716 options->orderfile = optarg;
3717 return argcount;
3718 }
3719 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3720 options->filter = optarg;
3721 return argcount;
3722 }
3723 else if (!strcmp(arg, "--abbrev"))
3724 options->abbrev = DEFAULT_ABBREV;
3725 else if (!prefixcmp(arg, "--abbrev=")) {
3726 options->abbrev = strtoul(arg + 9, NULL, 10);
3727 if (options->abbrev < MINIMUM_ABBREV)
3728 options->abbrev = MINIMUM_ABBREV;
3729 else if (40 < options->abbrev)
3730 options->abbrev = 40;
3731 }
3732 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3733 options->a_prefix = optarg;
3734 return argcount;
3735 }
3736 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3737 options->b_prefix = optarg;
3738 return argcount;
3739 }
3740 else if (!strcmp(arg, "--no-prefix"))
3741 options->a_prefix = options->b_prefix = "";
3742 else if (opt_arg(arg, '\0', "inter-hunk-context",
3743 &options->interhunkcontext))
3744 ;
3745 else if (!strcmp(arg, "-W"))
3746 DIFF_OPT_SET(options, FUNCCONTEXT);
3747 else if (!strcmp(arg, "--function-context"))
3748 DIFF_OPT_SET(options, FUNCCONTEXT);
3749 else if (!strcmp(arg, "--no-function-context"))
3750 DIFF_OPT_CLR(options, FUNCCONTEXT);
3751 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3752 options->file = fopen(optarg, "w");
3753 if (!options->file)
3754 die_errno("Could not open '%s'", optarg);
3755 options->close_file = 1;
3756 return argcount;
3757 } else
3758 return 0;
3759 return 1;
3760 }
3761
3762 int parse_rename_score(const char **cp_p)
3763 {
3764 unsigned long num, scale;
3765 int ch, dot;
3766 const char *cp = *cp_p;
3767
3768 num = 0;
3769 scale = 1;
3770 dot = 0;
3771 for (;;) {
3772 ch = *cp;
3773 if ( !dot && ch == '.' ) {
3774 scale = 1;
3775 dot = 1;
3776 } else if ( ch == '%' ) {
3777 scale = dot ? scale*100 : 100;
3778 cp++; /* % is always at the end */
3779 break;
3780 } else if ( ch >= '0' && ch <= '9' ) {
3781 if ( scale < 100000 ) {
3782 scale *= 10;
3783 num = (num*10) + (ch-'0');
3784 }
3785 } else {
3786 break;
3787 }
3788 cp++;
3789 }
3790 *cp_p = cp;
3791
3792 /* user says num divided by scale and we say internally that
3793 * is MAX_SCORE * num / scale.
3794 */
3795 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3796 }
3797
3798 static int diff_scoreopt_parse(const char *opt)
3799 {
3800 int opt1, opt2, cmd;
3801
3802 if (*opt++ != '-')
3803 return -1;
3804 cmd = *opt++;
3805 if (cmd == '-') {
3806 /* convert the long-form arguments into short-form versions */
3807 if (!prefixcmp(opt, "break-rewrites")) {
3808 opt += strlen("break-rewrites");
3809 if (*opt == 0 || *opt++ == '=')
3810 cmd = 'B';
3811 } else if (!prefixcmp(opt, "find-copies")) {
3812 opt += strlen("find-copies");
3813 if (*opt == 0 || *opt++ == '=')
3814 cmd = 'C';
3815 } else if (!prefixcmp(opt, "find-renames")) {
3816 opt += strlen("find-renames");
3817 if (*opt == 0 || *opt++ == '=')
3818 cmd = 'M';
3819 }
3820 }
3821 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3822 return -1; /* that is not a -M, -C nor -B option */
3823
3824 opt1 = parse_rename_score(&opt);
3825 if (cmd != 'B')
3826 opt2 = 0;
3827 else {
3828 if (*opt == 0)
3829 opt2 = 0;
3830 else if (*opt != '/')
3831 return -1; /* we expect -B80/99 or -B80 */
3832 else {
3833 opt++;
3834 opt2 = parse_rename_score(&opt);
3835 }
3836 }
3837 if (*opt != 0)
3838 return -1;
3839 return opt1 | (opt2 << 16);
3840 }
3841
3842 struct diff_queue_struct diff_queued_diff;
3843
3844 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3845 {
3846 if (queue->alloc <= queue->nr) {
3847 queue->alloc = alloc_nr(queue->alloc);
3848 queue->queue = xrealloc(queue->queue,
3849 sizeof(dp) * queue->alloc);
3850 }
3851 queue->queue[queue->nr++] = dp;
3852 }
3853
3854 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3855 struct diff_filespec *one,
3856 struct diff_filespec *two)
3857 {
3858 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3859 dp->one = one;
3860 dp->two = two;
3861 if (queue)
3862 diff_q(queue, dp);
3863 return dp;
3864 }
3865
3866 void diff_free_filepair(struct diff_filepair *p)
3867 {
3868 free_filespec(p->one);
3869 free_filespec(p->two);
3870 free(p);
3871 }
3872
3873 /* This is different from find_unique_abbrev() in that
3874 * it stuffs the result with dots for alignment.
3875 */
3876 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3877 {
3878 int abblen;
3879 const char *abbrev;
3880 if (len == 40)
3881 return sha1_to_hex(sha1);
3882
3883 abbrev = find_unique_abbrev(sha1, len);
3884 abblen = strlen(abbrev);
3885 if (abblen < 37) {
3886 static char hex[41];
3887 if (len < abblen && abblen <= len + 2)
3888 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3889 else
3890 sprintf(hex, "%s...", abbrev);
3891 return hex;
3892 }
3893 return sha1_to_hex(sha1);
3894 }
3895
3896 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3897 {
3898 int line_termination = opt->line_termination;
3899 int inter_name_termination = line_termination ? '\t' : '\0';
3900
3901 fprintf(opt->file, "%s", diff_line_prefix(opt));
3902 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3903 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3904 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3905 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3906 }
3907 if (p->score) {
3908 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3909 inter_name_termination);
3910 } else {
3911 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3912 }
3913
3914 if (p->status == DIFF_STATUS_COPIED ||
3915 p->status == DIFF_STATUS_RENAMED) {
3916 const char *name_a, *name_b;
3917 name_a = p->one->path;
3918 name_b = p->two->path;
3919 strip_prefix(opt->prefix_length, &name_a, &name_b);
3920 write_name_quoted(name_a, opt->file, inter_name_termination);
3921 write_name_quoted(name_b, opt->file, line_termination);
3922 } else {
3923 const char *name_a, *name_b;
3924 name_a = p->one->mode ? p->one->path : p->two->path;
3925 name_b = NULL;
3926 strip_prefix(opt->prefix_length, &name_a, &name_b);
3927 write_name_quoted(name_a, opt->file, line_termination);
3928 }
3929 }
3930
3931 int diff_unmodified_pair(struct diff_filepair *p)
3932 {
3933 /* This function is written stricter than necessary to support
3934 * the currently implemented transformers, but the idea is to
3935 * let transformers to produce diff_filepairs any way they want,
3936 * and filter and clean them up here before producing the output.
3937 */
3938 struct diff_filespec *one = p->one, *two = p->two;
3939
3940 if (DIFF_PAIR_UNMERGED(p))
3941 return 0; /* unmerged is interesting */
3942
3943 /* deletion, addition, mode or type change
3944 * and rename are all interesting.
3945 */
3946 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3947 DIFF_PAIR_MODE_CHANGED(p) ||
3948 strcmp(one->path, two->path))
3949 return 0;
3950
3951 /* both are valid and point at the same path. that is, we are
3952 * dealing with a change.
3953 */
3954 if (one->sha1_valid && two->sha1_valid &&
3955 !hashcmp(one->sha1, two->sha1) &&
3956 !one->dirty_submodule && !two->dirty_submodule)
3957 return 1; /* no change */
3958 if (!one->sha1_valid && !two->sha1_valid)
3959 return 1; /* both look at the same file on the filesystem. */
3960 return 0;
3961 }
3962
3963 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3964 {
3965 if (diff_unmodified_pair(p))
3966 return;
3967
3968 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3969 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3970 return; /* no tree diffs in patch format */
3971
3972 run_diff(p, o);
3973 }
3974
3975 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3976 struct diffstat_t *diffstat)
3977 {
3978 if (diff_unmodified_pair(p))
3979 return;
3980
3981 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3982 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3983 return; /* no useful stat for tree diffs */
3984
3985 run_diffstat(p, o, diffstat);
3986 }
3987
3988 static void diff_flush_checkdiff(struct diff_filepair *p,
3989 struct diff_options *o)
3990 {
3991 if (diff_unmodified_pair(p))
3992 return;
3993
3994 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3995 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3996 return; /* nothing to check in tree diffs */
3997
3998 run_checkdiff(p, o);
3999 }
4000
4001 int diff_queue_is_empty(void)
4002 {
4003 struct diff_queue_struct *q = &diff_queued_diff;
4004 int i;
4005 for (i = 0; i < q->nr; i++)
4006 if (!diff_unmodified_pair(q->queue[i]))
4007 return 0;
4008 return 1;
4009 }
4010
4011 #if DIFF_DEBUG
4012 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4013 {
4014 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4015 x, one ? one : "",
4016 s->path,
4017 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4018 s->mode,
4019 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4020 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
4021 x, one ? one : "",
4022 s->size, s->xfrm_flags);
4023 }
4024
4025 void diff_debug_filepair(const struct diff_filepair *p, int i)
4026 {
4027 diff_debug_filespec(p->one, i, "one");
4028 diff_debug_filespec(p->two, i, "two");
4029 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4030 p->score, p->status ? p->status : '?',
4031 p->one->rename_used, p->broken_pair);
4032 }
4033
4034 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4035 {
4036 int i;
4037 if (msg)
4038 fprintf(stderr, "%s\n", msg);
4039 fprintf(stderr, "q->nr = %d\n", q->nr);
4040 for (i = 0; i < q->nr; i++) {
4041 struct diff_filepair *p = q->queue[i];
4042 diff_debug_filepair(p, i);
4043 }
4044 }
4045 #endif
4046
4047 static void diff_resolve_rename_copy(void)
4048 {
4049 int i;
4050 struct diff_filepair *p;
4051 struct diff_queue_struct *q = &diff_queued_diff;
4052
4053 diff_debug_queue("resolve-rename-copy", q);
4054
4055 for (i = 0; i < q->nr; i++) {
4056 p = q->queue[i];
4057 p->status = 0; /* undecided */
4058 if (DIFF_PAIR_UNMERGED(p))
4059 p->status = DIFF_STATUS_UNMERGED;
4060 else if (!DIFF_FILE_VALID(p->one))
4061 p->status = DIFF_STATUS_ADDED;
4062 else if (!DIFF_FILE_VALID(p->two))
4063 p->status = DIFF_STATUS_DELETED;
4064 else if (DIFF_PAIR_TYPE_CHANGED(p))
4065 p->status = DIFF_STATUS_TYPE_CHANGED;
4066
4067 /* from this point on, we are dealing with a pair
4068 * whose both sides are valid and of the same type, i.e.
4069 * either in-place edit or rename/copy edit.
4070 */
4071 else if (DIFF_PAIR_RENAME(p)) {
4072 /*
4073 * A rename might have re-connected a broken
4074 * pair up, causing the pathnames to be the
4075 * same again. If so, that's not a rename at
4076 * all, just a modification..
4077 *
4078 * Otherwise, see if this source was used for
4079 * multiple renames, in which case we decrement
4080 * the count, and call it a copy.
4081 */
4082 if (!strcmp(p->one->path, p->two->path))
4083 p->status = DIFF_STATUS_MODIFIED;
4084 else if (--p->one->rename_used > 0)
4085 p->status = DIFF_STATUS_COPIED;
4086 else
4087 p->status = DIFF_STATUS_RENAMED;
4088 }
4089 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4090 p->one->mode != p->two->mode ||
4091 p->one->dirty_submodule ||
4092 p->two->dirty_submodule ||
4093 is_null_sha1(p->one->sha1))
4094 p->status = DIFF_STATUS_MODIFIED;
4095 else {
4096 /* This is a "no-change" entry and should not
4097 * happen anymore, but prepare for broken callers.
4098 */
4099 error("feeding unmodified %s to diffcore",
4100 p->one->path);
4101 p->status = DIFF_STATUS_UNKNOWN;
4102 }
4103 }
4104 diff_debug_queue("resolve-rename-copy done", q);
4105 }
4106
4107 static int check_pair_status(struct diff_filepair *p)
4108 {
4109 switch (p->status) {
4110 case DIFF_STATUS_UNKNOWN:
4111 return 0;
4112 case 0:
4113 die("internal error in diff-resolve-rename-copy");
4114 default:
4115 return 1;
4116 }
4117 }
4118
4119 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4120 {
4121 int fmt = opt->output_format;
4122
4123 if (fmt & DIFF_FORMAT_CHECKDIFF)
4124 diff_flush_checkdiff(p, opt);
4125 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4126 diff_flush_raw(p, opt);
4127 else if (fmt & DIFF_FORMAT_NAME) {
4128 const char *name_a, *name_b;
4129 name_a = p->two->path;
4130 name_b = NULL;
4131 strip_prefix(opt->prefix_length, &name_a, &name_b);
4132 write_name_quoted(name_a, opt->file, opt->line_termination);
4133 }
4134 }
4135
4136 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4137 {
4138 if (fs->mode)
4139 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4140 else
4141 fprintf(file, " %s ", newdelete);
4142 write_name_quoted(fs->path, file, '\n');
4143 }
4144
4145
4146 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4147 const char *line_prefix)
4148 {
4149 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4150 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4151 p->two->mode, show_name ? ' ' : '\n');
4152 if (show_name) {
4153 write_name_quoted(p->two->path, file, '\n');
4154 }
4155 }
4156 }
4157
4158 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4159 const char *line_prefix)
4160 {
4161 char *names = pprint_rename(p->one->path, p->two->path);
4162
4163 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4164 free(names);
4165 show_mode_change(file, p, 0, line_prefix);
4166 }
4167
4168 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4169 {
4170 FILE *file = opt->file;
4171 const char *line_prefix = diff_line_prefix(opt);
4172
4173 switch(p->status) {
4174 case DIFF_STATUS_DELETED:
4175 fputs(line_prefix, file);
4176 show_file_mode_name(file, "delete", p->one);
4177 break;
4178 case DIFF_STATUS_ADDED:
4179 fputs(line_prefix, file);
4180 show_file_mode_name(file, "create", p->two);
4181 break;
4182 case DIFF_STATUS_COPIED:
4183 fputs(line_prefix, file);
4184 show_rename_copy(file, "copy", p, line_prefix);
4185 break;
4186 case DIFF_STATUS_RENAMED:
4187 fputs(line_prefix, file);
4188 show_rename_copy(file, "rename", p, line_prefix);
4189 break;
4190 default:
4191 if (p->score) {
4192 fprintf(file, "%s rewrite ", line_prefix);
4193 write_name_quoted(p->two->path, file, ' ');
4194 fprintf(file, "(%d%%)\n", similarity_index(p));
4195 }
4196 show_mode_change(file, p, !p->score, line_prefix);
4197 break;
4198 }
4199 }
4200
4201 struct patch_id_t {
4202 git_SHA_CTX *ctx;
4203 int patchlen;
4204 };
4205
4206 static int remove_space(char *line, int len)
4207 {
4208 int i;
4209 char *dst = line;
4210 unsigned char c;
4211
4212 for (i = 0; i < len; i++)
4213 if (!isspace((c = line[i])))
4214 *dst++ = c;
4215
4216 return dst - line;
4217 }
4218
4219 static void patch_id_consume(void *priv, char *line, unsigned long len)
4220 {
4221 struct patch_id_t *data = priv;
4222 int new_len;
4223
4224 /* Ignore line numbers when computing the SHA1 of the patch */
4225 if (!prefixcmp(line, "@@ -"))
4226 return;
4227
4228 new_len = remove_space(line, len);
4229
4230 git_SHA1_Update(data->ctx, line, new_len);
4231 data->patchlen += new_len;
4232 }
4233
4234 /* returns 0 upon success, and writes result into sha1 */
4235 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4236 {
4237 struct diff_queue_struct *q = &diff_queued_diff;
4238 int i;
4239 git_SHA_CTX ctx;
4240 struct patch_id_t data;
4241 char buffer[PATH_MAX * 4 + 20];
4242
4243 git_SHA1_Init(&ctx);
4244 memset(&data, 0, sizeof(struct patch_id_t));
4245 data.ctx = &ctx;
4246
4247 for (i = 0; i < q->nr; i++) {
4248 xpparam_t xpp;
4249 xdemitconf_t xecfg;
4250 mmfile_t mf1, mf2;
4251 struct diff_filepair *p = q->queue[i];
4252 int len1, len2;
4253
4254 memset(&xpp, 0, sizeof(xpp));
4255 memset(&xecfg, 0, sizeof(xecfg));
4256 if (p->status == 0)
4257 return error("internal diff status error");
4258 if (p->status == DIFF_STATUS_UNKNOWN)
4259 continue;
4260 if (diff_unmodified_pair(p))
4261 continue;
4262 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4263 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4264 continue;
4265 if (DIFF_PAIR_UNMERGED(p))
4266 continue;
4267
4268 diff_fill_sha1_info(p->one);
4269 diff_fill_sha1_info(p->two);
4270 if (fill_mmfile(&mf1, p->one) < 0 ||
4271 fill_mmfile(&mf2, p->two) < 0)
4272 return error("unable to read files to diff");
4273
4274 len1 = remove_space(p->one->path, strlen(p->one->path));
4275 len2 = remove_space(p->two->path, strlen(p->two->path));
4276 if (p->one->mode == 0)
4277 len1 = snprintf(buffer, sizeof(buffer),
4278 "diff--gita/%.*sb/%.*s"
4279 "newfilemode%06o"
4280 "---/dev/null"
4281 "+++b/%.*s",
4282 len1, p->one->path,
4283 len2, p->two->path,
4284 p->two->mode,
4285 len2, p->two->path);
4286 else if (p->two->mode == 0)
4287 len1 = snprintf(buffer, sizeof(buffer),
4288 "diff--gita/%.*sb/%.*s"
4289 "deletedfilemode%06o"
4290 "---a/%.*s"
4291 "+++/dev/null",
4292 len1, p->one->path,
4293 len2, p->two->path,
4294 p->one->mode,
4295 len1, p->one->path);
4296 else
4297 len1 = snprintf(buffer, sizeof(buffer),
4298 "diff--gita/%.*sb/%.*s"
4299 "---a/%.*s"
4300 "+++b/%.*s",
4301 len1, p->one->path,
4302 len2, p->two->path,
4303 len1, p->one->path,
4304 len2, p->two->path);
4305 git_SHA1_Update(&ctx, buffer, len1);
4306
4307 if (diff_filespec_is_binary(p->one) ||
4308 diff_filespec_is_binary(p->two)) {
4309 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4310 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4311 continue;
4312 }
4313
4314 xpp.flags = 0;
4315 xecfg.ctxlen = 3;
4316 xecfg.flags = 0;
4317 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4318 &xpp, &xecfg);
4319 }
4320
4321 git_SHA1_Final(sha1, &ctx);
4322 return 0;
4323 }
4324
4325 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4326 {
4327 struct diff_queue_struct *q = &diff_queued_diff;
4328 int i;
4329 int result = diff_get_patch_id(options, sha1);
4330
4331 for (i = 0; i < q->nr; i++)
4332 diff_free_filepair(q->queue[i]);
4333
4334 free(q->queue);
4335 DIFF_QUEUE_CLEAR(q);
4336
4337 return result;
4338 }
4339
4340 static int is_summary_empty(const struct diff_queue_struct *q)
4341 {
4342 int i;
4343
4344 for (i = 0; i < q->nr; i++) {
4345 const struct diff_filepair *p = q->queue[i];
4346
4347 switch (p->status) {
4348 case DIFF_STATUS_DELETED:
4349 case DIFF_STATUS_ADDED:
4350 case DIFF_STATUS_COPIED:
4351 case DIFF_STATUS_RENAMED:
4352 return 0;
4353 default:
4354 if (p->score)
4355 return 0;
4356 if (p->one->mode && p->two->mode &&
4357 p->one->mode != p->two->mode)
4358 return 0;
4359 break;
4360 }
4361 }
4362 return 1;
4363 }
4364
4365 static const char rename_limit_warning[] =
4366 "inexact rename detection was skipped due to too many files.";
4367
4368 static const char degrade_cc_to_c_warning[] =
4369 "only found copies from modified paths due to too many files.";
4370
4371 static const char rename_limit_advice[] =
4372 "you may want to set your %s variable to at least "
4373 "%d and retry the command.";
4374
4375 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4376 {
4377 if (degraded_cc)
4378 warning(degrade_cc_to_c_warning);
4379 else if (needed)
4380 warning(rename_limit_warning);
4381 else
4382 return;
4383 if (0 < needed && needed < 32767)
4384 warning(rename_limit_advice, varname, needed);
4385 }
4386
4387 void diff_flush(struct diff_options *options)
4388 {
4389 struct diff_queue_struct *q = &diff_queued_diff;
4390 int i, output_format = options->output_format;
4391 int separator = 0;
4392 int dirstat_by_line = 0;
4393
4394 /*
4395 * Order: raw, stat, summary, patch
4396 * or: name/name-status/checkdiff (other bits clear)
4397 */
4398 if (!q->nr)
4399 goto free_queue;
4400
4401 if (output_format & (DIFF_FORMAT_RAW |
4402 DIFF_FORMAT_NAME |
4403 DIFF_FORMAT_NAME_STATUS |
4404 DIFF_FORMAT_CHECKDIFF)) {
4405 for (i = 0; i < q->nr; i++) {
4406 struct diff_filepair *p = q->queue[i];
4407 if (check_pair_status(p))
4408 flush_one_pair(p, options);
4409 }
4410 separator++;
4411 }
4412
4413 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4414 dirstat_by_line = 1;
4415
4416 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4417 dirstat_by_line) {
4418 struct diffstat_t diffstat;
4419
4420 memset(&diffstat, 0, sizeof(struct diffstat_t));
4421 for (i = 0; i < q->nr; i++) {
4422 struct diff_filepair *p = q->queue[i];
4423 if (check_pair_status(p))
4424 diff_flush_stat(p, options, &diffstat);
4425 }
4426 if (output_format & DIFF_FORMAT_NUMSTAT)
4427 show_numstat(&diffstat, options);
4428 if (output_format & DIFF_FORMAT_DIFFSTAT)
4429 show_stats(&diffstat, options);
4430 if (output_format & DIFF_FORMAT_SHORTSTAT)
4431 show_shortstats(&diffstat, options);
4432 if (output_format & DIFF_FORMAT_DIRSTAT)
4433 show_dirstat_by_line(&diffstat, options);
4434 free_diffstat_info(&diffstat);
4435 separator++;
4436 }
4437 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4438 show_dirstat(options);
4439
4440 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4441 for (i = 0; i < q->nr; i++) {
4442 diff_summary(options, q->queue[i]);
4443 }
4444 separator++;
4445 }
4446
4447 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4448 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4449 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4450 /*
4451 * run diff_flush_patch for the exit status. setting
4452 * options->file to /dev/null should be safe, becaue we
4453 * aren't supposed to produce any output anyway.
4454 */
4455 if (options->close_file)
4456 fclose(options->file);
4457 options->file = fopen("/dev/null", "w");
4458 if (!options->file)
4459 die_errno("Could not open /dev/null");
4460 options->close_file = 1;
4461 for (i = 0; i < q->nr; i++) {
4462 struct diff_filepair *p = q->queue[i];
4463 if (check_pair_status(p))
4464 diff_flush_patch(p, options);
4465 if (options->found_changes)
4466 break;
4467 }
4468 }
4469
4470 if (output_format & DIFF_FORMAT_PATCH) {
4471 if (separator) {
4472 fprintf(options->file, "%s%c",
4473 diff_line_prefix(options),
4474 options->line_termination);
4475 if (options->stat_sep) {
4476 /* attach patch instead of inline */
4477 fputs(options->stat_sep, options->file);
4478 }
4479 }
4480
4481 for (i = 0; i < q->nr; i++) {
4482 struct diff_filepair *p = q->queue[i];
4483 if (check_pair_status(p))
4484 diff_flush_patch(p, options);
4485 }
4486 }
4487
4488 if (output_format & DIFF_FORMAT_CALLBACK)
4489 options->format_callback(q, options, options->format_callback_data);
4490
4491 for (i = 0; i < q->nr; i++)
4492 diff_free_filepair(q->queue[i]);
4493 free_queue:
4494 free(q->queue);
4495 DIFF_QUEUE_CLEAR(q);
4496 if (options->close_file)
4497 fclose(options->file);
4498
4499 /*
4500 * Report the content-level differences with HAS_CHANGES;
4501 * diff_addremove/diff_change does not set the bit when
4502 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4503 */
4504 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4505 if (options->found_changes)
4506 DIFF_OPT_SET(options, HAS_CHANGES);
4507 else
4508 DIFF_OPT_CLR(options, HAS_CHANGES);
4509 }
4510 }
4511
4512 static void diffcore_apply_filter(const char *filter)
4513 {
4514 int i;
4515 struct diff_queue_struct *q = &diff_queued_diff;
4516 struct diff_queue_struct outq;
4517 DIFF_QUEUE_CLEAR(&outq);
4518
4519 if (!filter)
4520 return;
4521
4522 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4523 int found;
4524 for (i = found = 0; !found && i < q->nr; i++) {
4525 struct diff_filepair *p = q->queue[i];
4526 if (((p->status == DIFF_STATUS_MODIFIED) &&
4527 ((p->score &&
4528 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4529 (!p->score &&
4530 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4531 ((p->status != DIFF_STATUS_MODIFIED) &&
4532 strchr(filter, p->status)))
4533 found++;
4534 }
4535 if (found)
4536 return;
4537
4538 /* otherwise we will clear the whole queue
4539 * by copying the empty outq at the end of this
4540 * function, but first clear the current entries
4541 * in the queue.
4542 */
4543 for (i = 0; i < q->nr; i++)
4544 diff_free_filepair(q->queue[i]);
4545 }
4546 else {
4547 /* Only the matching ones */
4548 for (i = 0; i < q->nr; i++) {
4549 struct diff_filepair *p = q->queue[i];
4550
4551 if (((p->status == DIFF_STATUS_MODIFIED) &&
4552 ((p->score &&
4553 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4554 (!p->score &&
4555 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4556 ((p->status != DIFF_STATUS_MODIFIED) &&
4557 strchr(filter, p->status)))
4558 diff_q(&outq, p);
4559 else
4560 diff_free_filepair(p);
4561 }
4562 }
4563 free(q->queue);
4564 *q = outq;
4565 }
4566
4567 /* Check whether two filespecs with the same mode and size are identical */
4568 static int diff_filespec_is_identical(struct diff_filespec *one,
4569 struct diff_filespec *two)
4570 {
4571 if (S_ISGITLINK(one->mode))
4572 return 0;
4573 if (diff_populate_filespec(one, 0))
4574 return 0;
4575 if (diff_populate_filespec(two, 0))
4576 return 0;
4577 return !memcmp(one->data, two->data, one->size);
4578 }
4579
4580 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4581 {
4582 int i;
4583 struct diff_queue_struct *q = &diff_queued_diff;
4584 struct diff_queue_struct outq;
4585 DIFF_QUEUE_CLEAR(&outq);
4586
4587 for (i = 0; i < q->nr; i++) {
4588 struct diff_filepair *p = q->queue[i];
4589
4590 /*
4591 * 1. Entries that come from stat info dirtiness
4592 * always have both sides (iow, not create/delete),
4593 * one side of the object name is unknown, with
4594 * the same mode and size. Keep the ones that
4595 * do not match these criteria. They have real
4596 * differences.
4597 *
4598 * 2. At this point, the file is known to be modified,
4599 * with the same mode and size, and the object
4600 * name of one side is unknown. Need to inspect
4601 * the identical contents.
4602 */
4603 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4604 !DIFF_FILE_VALID(p->two) ||
4605 (p->one->sha1_valid && p->two->sha1_valid) ||
4606 (p->one->mode != p->two->mode) ||
4607 diff_populate_filespec(p->one, 1) ||
4608 diff_populate_filespec(p->two, 1) ||
4609 (p->one->size != p->two->size) ||
4610 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4611 diff_q(&outq, p);
4612 else {
4613 /*
4614 * The caller can subtract 1 from skip_stat_unmatch
4615 * to determine how many paths were dirty only
4616 * due to stat info mismatch.
4617 */
4618 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4619 diffopt->skip_stat_unmatch++;
4620 diff_free_filepair(p);
4621 }
4622 }
4623 free(q->queue);
4624 *q = outq;
4625 }
4626
4627 static int diffnamecmp(const void *a_, const void *b_)
4628 {
4629 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4630 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4631 const char *name_a, *name_b;
4632
4633 name_a = a->one ? a->one->path : a->two->path;
4634 name_b = b->one ? b->one->path : b->two->path;
4635 return strcmp(name_a, name_b);
4636 }
4637
4638 void diffcore_fix_diff_index(struct diff_options *options)
4639 {
4640 struct diff_queue_struct *q = &diff_queued_diff;
4641 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4642 }
4643
4644 void diffcore_std(struct diff_options *options)
4645 {
4646 if (options->skip_stat_unmatch)
4647 diffcore_skip_stat_unmatch(options);
4648 if (!options->found_follow) {
4649 /* See try_to_follow_renames() in tree-diff.c */
4650 if (options->break_opt != -1)
4651 diffcore_break(options->break_opt);
4652 if (options->detect_rename)
4653 diffcore_rename(options);
4654 if (options->break_opt != -1)
4655 diffcore_merge_broken();
4656 }
4657 if (options->pickaxe)
4658 diffcore_pickaxe(options);
4659 if (options->orderfile)
4660 diffcore_order(options->orderfile);
4661 if (!options->found_follow)
4662 /* See try_to_follow_renames() in tree-diff.c */
4663 diff_resolve_rename_copy();
4664 diffcore_apply_filter(options->filter);
4665
4666 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4667 DIFF_OPT_SET(options, HAS_CHANGES);
4668 else
4669 DIFF_OPT_CLR(options, HAS_CHANGES);
4670
4671 options->found_follow = 0;
4672 }
4673
4674 int diff_result_code(struct diff_options *opt, int status)
4675 {
4676 int result = 0;
4677
4678 diff_warn_rename_limit("diff.renameLimit",
4679 opt->needed_rename_limit,
4680 opt->degraded_cc_to_c);
4681 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4682 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4683 return status;
4684 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4685 DIFF_OPT_TST(opt, HAS_CHANGES))
4686 result |= 01;
4687 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4688 DIFF_OPT_TST(opt, CHECK_FAILED))
4689 result |= 02;
4690 return result;
4691 }
4692
4693 int diff_can_quit_early(struct diff_options *opt)
4694 {
4695 return (DIFF_OPT_TST(opt, QUICK) &&
4696 !opt->filter &&
4697 DIFF_OPT_TST(opt, HAS_CHANGES));
4698 }
4699
4700 /*
4701 * Shall changes to this submodule be ignored?
4702 *
4703 * Submodule changes can be configured to be ignored separately for each path,
4704 * but that configuration can be overridden from the command line.
4705 */
4706 static int is_submodule_ignored(const char *path, struct diff_options *options)
4707 {
4708 int ignored = 0;
4709 unsigned orig_flags = options->flags;
4710 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4711 set_diffopt_flags_from_submodule_config(options, path);
4712 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4713 ignored = 1;
4714 options->flags = orig_flags;
4715 return ignored;
4716 }
4717
4718 void diff_addremove(struct diff_options *options,
4719 int addremove, unsigned mode,
4720 const unsigned char *sha1,
4721 int sha1_valid,
4722 const char *concatpath, unsigned dirty_submodule)
4723 {
4724 struct diff_filespec *one, *two;
4725
4726 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4727 return;
4728
4729 /* This may look odd, but it is a preparation for
4730 * feeding "there are unchanged files which should
4731 * not produce diffs, but when you are doing copy
4732 * detection you would need them, so here they are"
4733 * entries to the diff-core. They will be prefixed
4734 * with something like '=' or '*' (I haven't decided
4735 * which but should not make any difference).
4736 * Feeding the same new and old to diff_change()
4737 * also has the same effect.
4738 * Before the final output happens, they are pruned after
4739 * merged into rename/copy pairs as appropriate.
4740 */
4741 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4742 addremove = (addremove == '+' ? '-' :
4743 addremove == '-' ? '+' : addremove);
4744
4745 if (options->prefix &&
4746 strncmp(concatpath, options->prefix, options->prefix_length))
4747 return;
4748
4749 one = alloc_filespec(concatpath);
4750 two = alloc_filespec(concatpath);
4751
4752 if (addremove != '+')
4753 fill_filespec(one, sha1, sha1_valid, mode);
4754 if (addremove != '-') {
4755 fill_filespec(two, sha1, sha1_valid, mode);
4756 two->dirty_submodule = dirty_submodule;
4757 }
4758
4759 diff_queue(&diff_queued_diff, one, two);
4760 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4761 DIFF_OPT_SET(options, HAS_CHANGES);
4762 }
4763
4764 void diff_change(struct diff_options *options,
4765 unsigned old_mode, unsigned new_mode,
4766 const unsigned char *old_sha1,
4767 const unsigned char *new_sha1,
4768 int old_sha1_valid, int new_sha1_valid,
4769 const char *concatpath,
4770 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4771 {
4772 struct diff_filespec *one, *two;
4773
4774 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4775 is_submodule_ignored(concatpath, options))
4776 return;
4777
4778 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4779 unsigned tmp;
4780 const unsigned char *tmp_c;
4781 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4782 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4783 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4784 new_sha1_valid = tmp;
4785 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4786 new_dirty_submodule = tmp;
4787 }
4788
4789 if (options->prefix &&
4790 strncmp(concatpath, options->prefix, options->prefix_length))
4791 return;
4792
4793 one = alloc_filespec(concatpath);
4794 two = alloc_filespec(concatpath);
4795 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4796 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4797 one->dirty_submodule = old_dirty_submodule;
4798 two->dirty_submodule = new_dirty_submodule;
4799
4800 diff_queue(&diff_queued_diff, one, two);
4801 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4802 DIFF_OPT_SET(options, HAS_CHANGES);
4803 }
4804
4805 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4806 {
4807 struct diff_filepair *pair;
4808 struct diff_filespec *one, *two;
4809
4810 if (options->prefix &&
4811 strncmp(path, options->prefix, options->prefix_length))
4812 return NULL;
4813
4814 one = alloc_filespec(path);
4815 two = alloc_filespec(path);
4816 pair = diff_queue(&diff_queued_diff, one, two);
4817 pair->is_unmerged = 1;
4818 return pair;
4819 }
4820
4821 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4822 size_t *outsize)
4823 {
4824 struct diff_tempfile *temp;
4825 const char *argv[3];
4826 const char **arg = argv;
4827 struct child_process child;
4828 struct strbuf buf = STRBUF_INIT;
4829 int err = 0;
4830
4831 temp = prepare_temp_file(spec->path, spec);
4832 *arg++ = pgm;
4833 *arg++ = temp->name;
4834 *arg = NULL;
4835
4836 memset(&child, 0, sizeof(child));
4837 child.use_shell = 1;
4838 child.argv = argv;
4839 child.out = -1;
4840 if (start_command(&child)) {
4841 remove_tempfile();
4842 return NULL;
4843 }
4844
4845 if (strbuf_read(&buf, child.out, 0) < 0)
4846 err = error("error reading from textconv command '%s'", pgm);
4847 close(child.out);
4848
4849 if (finish_command(&child) || err) {
4850 strbuf_release(&buf);
4851 remove_tempfile();
4852 return NULL;
4853 }
4854 remove_tempfile();
4855
4856 return strbuf_detach(&buf, outsize);
4857 }
4858
4859 size_t fill_textconv(struct userdiff_driver *driver,
4860 struct diff_filespec *df,
4861 char **outbuf)
4862 {
4863 size_t size;
4864
4865 if (!driver || !driver->textconv) {
4866 if (!DIFF_FILE_VALID(df)) {
4867 *outbuf = "";
4868 return 0;
4869 }
4870 if (diff_populate_filespec(df, 0))
4871 die("unable to read files to diff");
4872 *outbuf = df->data;
4873 return df->size;
4874 }
4875
4876 if (driver->textconv_cache && df->sha1_valid) {
4877 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4878 &size);
4879 if (*outbuf)
4880 return size;
4881 }
4882
4883 *outbuf = run_textconv(driver->textconv, df, &size);
4884 if (!*outbuf)
4885 die("unable to read files to diff");
4886
4887 if (driver->textconv_cache && df->sha1_valid) {
4888 /* ignore errors, as we might be in a readonly repository */
4889 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4890 size);
4891 /*
4892 * we could save up changes and flush them all at the end,
4893 * but we would need an extra call after all diffing is done.
4894 * Since generating a cache entry is the slow path anyway,
4895 * this extra overhead probably isn't a big deal.
4896 */
4897 notes_cache_write(driver->textconv_cache);
4898 }
4899
4900 return size;
4901 }
4902
4903 void setup_diff_pager(struct diff_options *opt)
4904 {
4905 /*
4906 * If the user asked for our exit code, then either they want --quiet
4907 * or --exit-code. We should definitely not bother with a pager in the
4908 * former case, as we will generate no output. Since we still properly
4909 * report our exit code even when a pager is run, we _could_ run a
4910 * pager with --exit-code. But since we have not done so historically,
4911 * and because it is easy to find people oneline advising "git diff
4912 * --exit-code" in hooks and other scripts, we do not do so.
4913 */
4914 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4915 check_pager_config("diff") != 0)
4916 setup_pager();
4917 }
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