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git-remote-mediawiki: fix encoding issue for UTF-8 media files
[git.git] / diff.c
blob54d530826881684c916a78a4334579a2e401ee47
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 static const char *diff_order_file_cfg;
34 int diff_auto_refresh_index = 1;
35 static int diff_mnemonic_prefix;
36 static int diff_no_prefix;
37 static int diff_stat_graph_width;
38 static int diff_dirstat_permille_default = 30;
39 static struct diff_options default_diff_options;
40 static long diff_algorithm;
41
42 static char diff_colors[][COLOR_MAXLEN] = {
43 GIT_COLOR_RESET,
44 GIT_COLOR_NORMAL, /* PLAIN */
45 GIT_COLOR_BOLD, /* METAINFO */
46 GIT_COLOR_CYAN, /* FRAGINFO */
47 GIT_COLOR_RED, /* OLD */
48 GIT_COLOR_GREEN, /* NEW */
49 GIT_COLOR_YELLOW, /* COMMIT */
50 GIT_COLOR_BG_RED, /* WHITESPACE */
51 GIT_COLOR_NORMAL, /* FUNCINFO */
52 };
53
54 static int parse_diff_color_slot(const char *var, int ofs)
55 {
56 if (!strcasecmp(var+ofs, "plain"))
57 return DIFF_PLAIN;
58 if (!strcasecmp(var+ofs, "meta"))
59 return DIFF_METAINFO;
60 if (!strcasecmp(var+ofs, "frag"))
61 return DIFF_FRAGINFO;
62 if (!strcasecmp(var+ofs, "old"))
63 return DIFF_FILE_OLD;
64 if (!strcasecmp(var+ofs, "new"))
65 return DIFF_FILE_NEW;
66 if (!strcasecmp(var+ofs, "commit"))
67 return DIFF_COMMIT;
68 if (!strcasecmp(var+ofs, "whitespace"))
69 return DIFF_WHITESPACE;
70 if (!strcasecmp(var+ofs, "func"))
71 return DIFF_FUNCINFO;
72 return -1;
73 }
74
75 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
76 struct strbuf *errmsg)
77 {
78 char *params_copy = xstrdup(params_string);
79 struct string_list params = STRING_LIST_INIT_NODUP;
80 int ret = 0;
81 int i;
82
83 if (*params_copy)
84 string_list_split_in_place(&params, params_copy, ',', -1);
85 for (i = 0; i < params.nr; i++) {
86 const char *p = params.items[i].string;
87 if (!strcmp(p, "changes")) {
88 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
89 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
90 } else if (!strcmp(p, "lines")) {
91 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
92 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
93 } else if (!strcmp(p, "files")) {
94 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
95 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
96 } else if (!strcmp(p, "noncumulative")) {
97 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
98 } else if (!strcmp(p, "cumulative")) {
99 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
100 } else if (isdigit(*p)) {
101 char *end;
102 int permille = strtoul(p, &end, 10) * 10;
103 if (*end == '.' && isdigit(*++end)) {
104 /* only use first digit */
105 permille += *end - '0';
106 /* .. and ignore any further digits */
107 while (isdigit(*++end))
108 ; /* nothing */
109 }
110 if (!*end)
111 options->dirstat_permille = permille;
112 else {
113 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
114 p);
115 ret++;
116 }
117 } else {
118 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
119 ret++;
120 }
121
122 }
123 string_list_clear(&params, 0);
124 free(params_copy);
125 return ret;
126 }
127
128 static int parse_submodule_params(struct diff_options *options, const char *value)
129 {
130 if (!strcmp(value, "log"))
131 DIFF_OPT_SET(options, SUBMODULE_LOG);
132 else if (!strcmp(value, "short"))
133 DIFF_OPT_CLR(options, SUBMODULE_LOG);
134 else
135 return -1;
136 return 0;
137 }
138
139 static int git_config_rename(const char *var, const char *value)
140 {
141 if (!value)
142 return DIFF_DETECT_RENAME;
143 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
144 return DIFF_DETECT_COPY;
145 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
146 }
147
148 long parse_algorithm_value(const char *value)
149 {
150 if (!value)
151 return -1;
152 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
153 return 0;
154 else if (!strcasecmp(value, "minimal"))
155 return XDF_NEED_MINIMAL;
156 else if (!strcasecmp(value, "patience"))
157 return XDF_PATIENCE_DIFF;
158 else if (!strcasecmp(value, "histogram"))
159 return XDF_HISTOGRAM_DIFF;
160 return -1;
161 }
162
163 /*
164 * These are to give UI layer defaults.
165 * The core-level commands such as git-diff-files should
166 * never be affected by the setting of diff.renames
167 * the user happens to have in the configuration file.
168 */
169 int git_diff_ui_config(const char *var, const char *value, void *cb)
170 {
171 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
172 diff_use_color_default = git_config_colorbool(var, value);
173 return 0;
174 }
175 if (!strcmp(var, "diff.context")) {
176 diff_context_default = git_config_int(var, value);
177 if (diff_context_default < 0)
178 return -1;
179 return 0;
180 }
181 if (!strcmp(var, "diff.renames")) {
182 diff_detect_rename_default = git_config_rename(var, value);
183 return 0;
184 }
185 if (!strcmp(var, "diff.autorefreshindex")) {
186 diff_auto_refresh_index = git_config_bool(var, value);
187 return 0;
188 }
189 if (!strcmp(var, "diff.mnemonicprefix")) {
190 diff_mnemonic_prefix = git_config_bool(var, value);
191 return 0;
192 }
193 if (!strcmp(var, "diff.noprefix")) {
194 diff_no_prefix = git_config_bool(var, value);
195 return 0;
196 }
197 if (!strcmp(var, "diff.statgraphwidth")) {
198 diff_stat_graph_width = git_config_int(var, value);
199 return 0;
200 }
201 if (!strcmp(var, "diff.external"))
202 return git_config_string(&external_diff_cmd_cfg, var, value);
203 if (!strcmp(var, "diff.wordregex"))
204 return git_config_string(&diff_word_regex_cfg, var, value);
205 if (!strcmp(var, "diff.orderfile"))
206 return git_config_pathname(&diff_order_file_cfg, var, value);
207
208 if (!strcmp(var, "diff.ignoresubmodules"))
209 handle_ignore_submodules_arg(&default_diff_options, value);
210
211 if (!strcmp(var, "diff.submodule")) {
212 if (parse_submodule_params(&default_diff_options, value))
213 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
214 value);
215 return 0;
216 }
217
218 if (!strcmp(var, "diff.algorithm")) {
219 diff_algorithm = parse_algorithm_value(value);
220 if (diff_algorithm < 0)
221 return -1;
222 return 0;
223 }
224
225 if (git_color_config(var, value, cb) < 0)
226 return -1;
227
228 return git_diff_basic_config(var, value, cb);
229 }
230
231 int git_diff_basic_config(const char *var, const char *value, void *cb)
232 {
233 if (!strcmp(var, "diff.renamelimit")) {
234 diff_rename_limit_default = git_config_int(var, value);
235 return 0;
236 }
237
238 if (userdiff_config(var, value) < 0)
239 return -1;
240
241 if (starts_with(var, "diff.color.") || starts_with(var, "color.diff.")) {
242 int slot = parse_diff_color_slot(var, 11);
243 if (slot < 0)
244 return 0;
245 if (!value)
246 return config_error_nonbool(var);
247 color_parse(value, var, diff_colors[slot]);
248 return 0;
249 }
250
251 /* like GNU diff's --suppress-blank-empty option */
252 if (!strcmp(var, "diff.suppressblankempty") ||
253 /* for backwards compatibility */
254 !strcmp(var, "diff.suppress-blank-empty")) {
255 diff_suppress_blank_empty = git_config_bool(var, value);
256 return 0;
257 }
258
259 if (!strcmp(var, "diff.dirstat")) {
260 struct strbuf errmsg = STRBUF_INIT;
261 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
262 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
263 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
264 errmsg.buf);
265 strbuf_release(&errmsg);
266 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
267 return 0;
268 }
269
270 if (starts_with(var, "submodule."))
271 return parse_submodule_config_option(var, value);
272
273 return git_default_config(var, value, cb);
274 }
275
276 static char *quote_two(const char *one, const char *two)
277 {
278 int need_one = quote_c_style(one, NULL, NULL, 1);
279 int need_two = quote_c_style(two, NULL, NULL, 1);
280 struct strbuf res = STRBUF_INIT;
281
282 if (need_one + need_two) {
283 strbuf_addch(&res, '"');
284 quote_c_style(one, &res, NULL, 1);
285 quote_c_style(two, &res, NULL, 1);
286 strbuf_addch(&res, '"');
287 } else {
288 strbuf_addstr(&res, one);
289 strbuf_addstr(&res, two);
290 }
291 return strbuf_detach(&res, NULL);
292 }
293
294 static const char *external_diff(void)
295 {
296 static const char *external_diff_cmd = NULL;
297 static int done_preparing = 0;
298
299 if (done_preparing)
300 return external_diff_cmd;
301 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
302 if (!external_diff_cmd)
303 external_diff_cmd = external_diff_cmd_cfg;
304 done_preparing = 1;
305 return external_diff_cmd;
306 }
307
308 static struct diff_tempfile {
309 const char *name; /* filename external diff should read from */
310 char hex[41];
311 char mode[10];
312 char tmp_path[PATH_MAX];
313 } diff_temp[2];
314
315 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
316
317 struct emit_callback {
318 int color_diff;
319 unsigned ws_rule;
320 int blank_at_eof_in_preimage;
321 int blank_at_eof_in_postimage;
322 int lno_in_preimage;
323 int lno_in_postimage;
324 sane_truncate_fn truncate;
325 const char **label_path;
326 struct diff_words_data *diff_words;
327 struct diff_options *opt;
328 int *found_changesp;
329 struct strbuf *header;
330 };
331
332 static int count_lines(const char *data, int size)
333 {
334 int count, ch, completely_empty = 1, nl_just_seen = 0;
335 count = 0;
336 while (0 < size--) {
337 ch = *data++;
338 if (ch == '\n') {
339 count++;
340 nl_just_seen = 1;
341 completely_empty = 0;
342 }
343 else {
344 nl_just_seen = 0;
345 completely_empty = 0;
346 }
347 }
348 if (completely_empty)
349 return 0;
350 if (!nl_just_seen)
351 count++; /* no trailing newline */
352 return count;
353 }
354
355 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
356 {
357 if (!DIFF_FILE_VALID(one)) {
358 mf->ptr = (char *)""; /* does not matter */
359 mf->size = 0;
360 return 0;
361 }
362 else if (diff_populate_filespec(one, 0))
363 return -1;
364
365 mf->ptr = one->data;
366 mf->size = one->size;
367 return 0;
368 }
369
370 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
371 static unsigned long diff_filespec_size(struct diff_filespec *one)
372 {
373 if (!DIFF_FILE_VALID(one))
374 return 0;
375 diff_populate_filespec(one, 1);
376 return one->size;
377 }
378
379 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
380 {
381 char *ptr = mf->ptr;
382 long size = mf->size;
383 int cnt = 0;
384
385 if (!size)
386 return cnt;
387 ptr += size - 1; /* pointing at the very end */
388 if (*ptr != '\n')
389 ; /* incomplete line */
390 else
391 ptr--; /* skip the last LF */
392 while (mf->ptr < ptr) {
393 char *prev_eol;
394 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
395 if (*prev_eol == '\n')
396 break;
397 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
398 break;
399 cnt++;
400 ptr = prev_eol - 1;
401 }
402 return cnt;
403 }
404
405 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
406 struct emit_callback *ecbdata)
407 {
408 int l1, l2, at;
409 unsigned ws_rule = ecbdata->ws_rule;
410 l1 = count_trailing_blank(mf1, ws_rule);
411 l2 = count_trailing_blank(mf2, ws_rule);
412 if (l2 <= l1) {
413 ecbdata->blank_at_eof_in_preimage = 0;
414 ecbdata->blank_at_eof_in_postimage = 0;
415 return;
416 }
417 at = count_lines(mf1->ptr, mf1->size);
418 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
419
420 at = count_lines(mf2->ptr, mf2->size);
421 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
422 }
423
424 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
425 int first, const char *line, int len)
426 {
427 int has_trailing_newline, has_trailing_carriage_return;
428 int nofirst;
429 FILE *file = o->file;
430
431 fputs(diff_line_prefix(o), file);
432
433 if (len == 0) {
434 has_trailing_newline = (first == '\n');
435 has_trailing_carriage_return = (!has_trailing_newline &&
436 (first == '\r'));
437 nofirst = has_trailing_newline || has_trailing_carriage_return;
438 } else {
439 has_trailing_newline = (len > 0 && line[len-1] == '\n');
440 if (has_trailing_newline)
441 len--;
442 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
443 if (has_trailing_carriage_return)
444 len--;
445 nofirst = 0;
446 }
447
448 if (len || !nofirst) {
449 fputs(set, file);
450 if (!nofirst)
451 fputc(first, file);
452 fwrite(line, len, 1, file);
453 fputs(reset, file);
454 }
455 if (has_trailing_carriage_return)
456 fputc('\r', file);
457 if (has_trailing_newline)
458 fputc('\n', file);
459 }
460
461 static void emit_line(struct diff_options *o, const char *set, const char *reset,
462 const char *line, int len)
463 {
464 emit_line_0(o, set, reset, line[0], line+1, len-1);
465 }
466
467 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
468 {
469 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
470 ecbdata->blank_at_eof_in_preimage &&
471 ecbdata->blank_at_eof_in_postimage &&
472 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
473 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
474 return 0;
475 return ws_blank_line(line, len, ecbdata->ws_rule);
476 }
477
478 static void emit_add_line(const char *reset,
479 struct emit_callback *ecbdata,
480 const char *line, int len)
481 {
482 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
483 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
484
485 if (!*ws)
486 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
487 else if (new_blank_line_at_eof(ecbdata, line, len))
488 /* Blank line at EOF - paint '+' as well */
489 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
490 else {
491 /* Emit just the prefix, then the rest. */
492 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
493 ws_check_emit(line, len, ecbdata->ws_rule,
494 ecbdata->opt->file, set, reset, ws);
495 }
496 }
497
498 static void emit_hunk_header(struct emit_callback *ecbdata,
499 const char *line, int len)
500 {
501 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
502 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
503 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
504 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
505 static const char atat[2] = { '@', '@' };
506 const char *cp, *ep;
507 struct strbuf msgbuf = STRBUF_INIT;
508 int org_len = len;
509 int i = 1;
510
511 /*
512 * As a hunk header must begin with "@@ -<old>, +<new> @@",
513 * it always is at least 10 bytes long.
514 */
515 if (len < 10 ||
516 memcmp(line, atat, 2) ||
517 !(ep = memmem(line + 2, len - 2, atat, 2))) {
518 emit_line(ecbdata->opt, plain, reset, line, len);
519 return;
520 }
521 ep += 2; /* skip over @@ */
522
523 /* The hunk header in fraginfo color */
524 strbuf_add(&msgbuf, frag, strlen(frag));
525 strbuf_add(&msgbuf, line, ep - line);
526 strbuf_add(&msgbuf, reset, strlen(reset));
527
528 /*
529 * trailing "\r\n"
530 */
531 for ( ; i < 3; i++)
532 if (line[len - i] == '\r' || line[len - i] == '\n')
533 len--;
534
535 /* blank before the func header */
536 for (cp = ep; ep - line < len; ep++)
537 if (*ep != ' ' && *ep != '\t')
538 break;
539 if (ep != cp) {
540 strbuf_add(&msgbuf, plain, strlen(plain));
541 strbuf_add(&msgbuf, cp, ep - cp);
542 strbuf_add(&msgbuf, reset, strlen(reset));
543 }
544
545 if (ep < line + len) {
546 strbuf_add(&msgbuf, func, strlen(func));
547 strbuf_add(&msgbuf, ep, line + len - ep);
548 strbuf_add(&msgbuf, reset, strlen(reset));
549 }
550
551 strbuf_add(&msgbuf, line + len, org_len - len);
552 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
553 strbuf_release(&msgbuf);
554 }
555
556 static struct diff_tempfile *claim_diff_tempfile(void) {
557 int i;
558 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
559 if (!diff_temp[i].name)
560 return diff_temp + i;
561 die("BUG: diff is failing to clean up its tempfiles");
562 }
563
564 static int remove_tempfile_installed;
565
566 static void remove_tempfile(void)
567 {
568 int i;
569 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
570 if (diff_temp[i].name == diff_temp[i].tmp_path)
571 unlink_or_warn(diff_temp[i].name);
572 diff_temp[i].name = NULL;
573 }
574 }
575
576 static void remove_tempfile_on_signal(int signo)
577 {
578 remove_tempfile();
579 sigchain_pop(signo);
580 raise(signo);
581 }
582
583 static void print_line_count(FILE *file, int count)
584 {
585 switch (count) {
586 case 0:
587 fprintf(file, "0,0");
588 break;
589 case 1:
590 fprintf(file, "1");
591 break;
592 default:
593 fprintf(file, "1,%d", count);
594 break;
595 }
596 }
597
598 static void emit_rewrite_lines(struct emit_callback *ecb,
599 int prefix, const char *data, int size)
600 {
601 const char *endp = NULL;
602 static const char *nneof = " No newline at end of file\n";
603 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
604 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
605
606 while (0 < size) {
607 int len;
608
609 endp = memchr(data, '\n', size);
610 len = endp ? (endp - data + 1) : size;
611 if (prefix != '+') {
612 ecb->lno_in_preimage++;
613 emit_line_0(ecb->opt, old, reset, '-',
614 data, len);
615 } else {
616 ecb->lno_in_postimage++;
617 emit_add_line(reset, ecb, data, len);
618 }
619 size -= len;
620 data += len;
621 }
622 if (!endp) {
623 const char *plain = diff_get_color(ecb->color_diff,
624 DIFF_PLAIN);
625 putc('\n', ecb->opt->file);
626 emit_line_0(ecb->opt, plain, reset, '\\',
627 nneof, strlen(nneof));
628 }
629 }
630
631 static void emit_rewrite_diff(const char *name_a,
632 const char *name_b,
633 struct diff_filespec *one,
634 struct diff_filespec *two,
635 struct userdiff_driver *textconv_one,
636 struct userdiff_driver *textconv_two,
637 struct diff_options *o)
638 {
639 int lc_a, lc_b;
640 const char *name_a_tab, *name_b_tab;
641 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
642 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
643 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
644 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
645 const char *a_prefix, *b_prefix;
646 char *data_one, *data_two;
647 size_t size_one, size_two;
648 struct emit_callback ecbdata;
649 const char *line_prefix = diff_line_prefix(o);
650
651 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
652 a_prefix = o->b_prefix;
653 b_prefix = o->a_prefix;
654 } else {
655 a_prefix = o->a_prefix;
656 b_prefix = o->b_prefix;
657 }
658
659 name_a += (*name_a == '/');
660 name_b += (*name_b == '/');
661 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
662 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
663
664 strbuf_reset(&a_name);
665 strbuf_reset(&b_name);
666 quote_two_c_style(&a_name, a_prefix, name_a, 0);
667 quote_two_c_style(&b_name, b_prefix, name_b, 0);
668
669 size_one = fill_textconv(textconv_one, one, &data_one);
670 size_two = fill_textconv(textconv_two, two, &data_two);
671
672 memset(&ecbdata, 0, sizeof(ecbdata));
673 ecbdata.color_diff = want_color(o->use_color);
674 ecbdata.found_changesp = &o->found_changes;
675 ecbdata.ws_rule = whitespace_rule(name_b);
676 ecbdata.opt = o;
677 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
678 mmfile_t mf1, mf2;
679 mf1.ptr = (char *)data_one;
680 mf2.ptr = (char *)data_two;
681 mf1.size = size_one;
682 mf2.size = size_two;
683 check_blank_at_eof(&mf1, &mf2, &ecbdata);
684 }
685 ecbdata.lno_in_preimage = 1;
686 ecbdata.lno_in_postimage = 1;
687
688 lc_a = count_lines(data_one, size_one);
689 lc_b = count_lines(data_two, size_two);
690 fprintf(o->file,
691 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
692 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
693 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
694 line_prefix, fraginfo);
695 if (!o->irreversible_delete)
696 print_line_count(o->file, lc_a);
697 else
698 fprintf(o->file, "?,?");
699 fprintf(o->file, " +");
700 print_line_count(o->file, lc_b);
701 fprintf(o->file, " @@%s\n", reset);
702 if (lc_a && !o->irreversible_delete)
703 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
704 if (lc_b)
705 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
706 if (textconv_one)
707 free((char *)data_one);
708 if (textconv_two)
709 free((char *)data_two);
710 }
711
712 struct diff_words_buffer {
713 mmfile_t text;
714 long alloc;
715 struct diff_words_orig {
716 const char *begin, *end;
717 } *orig;
718 int orig_nr, orig_alloc;
719 };
720
721 static void diff_words_append(char *line, unsigned long len,
722 struct diff_words_buffer *buffer)
723 {
724 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
725 line++;
726 len--;
727 memcpy(buffer->text.ptr + buffer->text.size, line, len);
728 buffer->text.size += len;
729 buffer->text.ptr[buffer->text.size] = '\0';
730 }
731
732 struct diff_words_style_elem {
733 const char *prefix;
734 const char *suffix;
735 const char *color; /* NULL; filled in by the setup code if
736 * color is enabled */
737 };
738
739 struct diff_words_style {
740 enum diff_words_type type;
741 struct diff_words_style_elem new, old, ctx;
742 const char *newline;
743 };
744
745 static struct diff_words_style diff_words_styles[] = {
746 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
747 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
748 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
749 };
750
751 struct diff_words_data {
752 struct diff_words_buffer minus, plus;
753 const char *current_plus;
754 int last_minus;
755 struct diff_options *opt;
756 regex_t *word_regex;
757 enum diff_words_type type;
758 struct diff_words_style *style;
759 };
760
761 static int fn_out_diff_words_write_helper(FILE *fp,
762 struct diff_words_style_elem *st_el,
763 const char *newline,
764 size_t count, const char *buf,
765 const char *line_prefix)
766 {
767 int print = 0;
768
769 while (count) {
770 char *p = memchr(buf, '\n', count);
771 if (print)
772 fputs(line_prefix, fp);
773 if (p != buf) {
774 if (st_el->color && fputs(st_el->color, fp) < 0)
775 return -1;
776 if (fputs(st_el->prefix, fp) < 0 ||
777 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
778 fputs(st_el->suffix, fp) < 0)
779 return -1;
780 if (st_el->color && *st_el->color
781 && fputs(GIT_COLOR_RESET, fp) < 0)
782 return -1;
783 }
784 if (!p)
785 return 0;
786 if (fputs(newline, fp) < 0)
787 return -1;
788 count -= p + 1 - buf;
789 buf = p + 1;
790 print = 1;
791 }
792 return 0;
793 }
794
795 /*
796 * '--color-words' algorithm can be described as:
797 *
798 * 1. collect a the minus/plus lines of a diff hunk, divided into
799 * minus-lines and plus-lines;
800 *
801 * 2. break both minus-lines and plus-lines into words and
802 * place them into two mmfile_t with one word for each line;
803 *
804 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
805 *
806 * And for the common parts of the both file, we output the plus side text.
807 * diff_words->current_plus is used to trace the current position of the plus file
808 * which printed. diff_words->last_minus is used to trace the last minus word
809 * printed.
810 *
811 * For '--graph' to work with '--color-words', we need to output the graph prefix
812 * on each line of color words output. Generally, there are two conditions on
813 * which we should output the prefix.
814 *
815 * 1. diff_words->last_minus == 0 &&
816 * diff_words->current_plus == diff_words->plus.text.ptr
817 *
818 * that is: the plus text must start as a new line, and if there is no minus
819 * word printed, a graph prefix must be printed.
820 *
821 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
822 * *(diff_words->current_plus - 1) == '\n'
823 *
824 * that is: a graph prefix must be printed following a '\n'
825 */
826 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
827 {
828 if ((diff_words->last_minus == 0 &&
829 diff_words->current_plus == diff_words->plus.text.ptr) ||
830 (diff_words->current_plus > diff_words->plus.text.ptr &&
831 *(diff_words->current_plus - 1) == '\n')) {
832 return 1;
833 } else {
834 return 0;
835 }
836 }
837
838 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
839 {
840 struct diff_words_data *diff_words = priv;
841 struct diff_words_style *style = diff_words->style;
842 int minus_first, minus_len, plus_first, plus_len;
843 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
844 struct diff_options *opt = diff_words->opt;
845 const char *line_prefix;
846
847 if (line[0] != '@' || parse_hunk_header(line, len,
848 &minus_first, &minus_len, &plus_first, &plus_len))
849 return;
850
851 assert(opt);
852 line_prefix = diff_line_prefix(opt);
853
854 /* POSIX requires that first be decremented by one if len == 0... */
855 if (minus_len) {
856 minus_begin = diff_words->minus.orig[minus_first].begin;
857 minus_end =
858 diff_words->minus.orig[minus_first + minus_len - 1].end;
859 } else
860 minus_begin = minus_end =
861 diff_words->minus.orig[minus_first].end;
862
863 if (plus_len) {
864 plus_begin = diff_words->plus.orig[plus_first].begin;
865 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
866 } else
867 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
868
869 if (color_words_output_graph_prefix(diff_words)) {
870 fputs(line_prefix, diff_words->opt->file);
871 }
872 if (diff_words->current_plus != plus_begin) {
873 fn_out_diff_words_write_helper(diff_words->opt->file,
874 &style->ctx, style->newline,
875 plus_begin - diff_words->current_plus,
876 diff_words->current_plus, line_prefix);
877 if (*(plus_begin - 1) == '\n')
878 fputs(line_prefix, diff_words->opt->file);
879 }
880 if (minus_begin != minus_end) {
881 fn_out_diff_words_write_helper(diff_words->opt->file,
882 &style->old, style->newline,
883 minus_end - minus_begin, minus_begin,
884 line_prefix);
885 }
886 if (plus_begin != plus_end) {
887 fn_out_diff_words_write_helper(diff_words->opt->file,
888 &style->new, style->newline,
889 plus_end - plus_begin, plus_begin,
890 line_prefix);
891 }
892
893 diff_words->current_plus = plus_end;
894 diff_words->last_minus = minus_first;
895 }
896
897 /* This function starts looking at *begin, and returns 0 iff a word was found. */
898 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
899 int *begin, int *end)
900 {
901 if (word_regex && *begin < buffer->size) {
902 regmatch_t match[1];
903 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
904 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
905 '\n', match[0].rm_eo - match[0].rm_so);
906 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
907 *begin += match[0].rm_so;
908 return *begin >= *end;
909 }
910 return -1;
911 }
912
913 /* find the next word */
914 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
915 (*begin)++;
916 if (*begin >= buffer->size)
917 return -1;
918
919 /* find the end of the word */
920 *end = *begin + 1;
921 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
922 (*end)++;
923
924 return 0;
925 }
926
927 /*
928 * This function splits the words in buffer->text, stores the list with
929 * newline separator into out, and saves the offsets of the original words
930 * in buffer->orig.
931 */
932 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
933 regex_t *word_regex)
934 {
935 int i, j;
936 long alloc = 0;
937
938 out->size = 0;
939 out->ptr = NULL;
940
941 /* fake an empty "0th" word */
942 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
943 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
944 buffer->orig_nr = 1;
945
946 for (i = 0; i < buffer->text.size; i++) {
947 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
948 return;
949
950 /* store original boundaries */
951 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
952 buffer->orig_alloc);
953 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
954 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
955 buffer->orig_nr++;
956
957 /* store one word */
958 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
959 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
960 out->ptr[out->size + j - i] = '\n';
961 out->size += j - i + 1;
962
963 i = j - 1;
964 }
965 }
966
967 /* this executes the word diff on the accumulated buffers */
968 static void diff_words_show(struct diff_words_data *diff_words)
969 {
970 xpparam_t xpp;
971 xdemitconf_t xecfg;
972 mmfile_t minus, plus;
973 struct diff_words_style *style = diff_words->style;
974
975 struct diff_options *opt = diff_words->opt;
976 const char *line_prefix;
977
978 assert(opt);
979 line_prefix = diff_line_prefix(opt);
980
981 /* special case: only removal */
982 if (!diff_words->plus.text.size) {
983 fputs(line_prefix, diff_words->opt->file);
984 fn_out_diff_words_write_helper(diff_words->opt->file,
985 &style->old, style->newline,
986 diff_words->minus.text.size,
987 diff_words->minus.text.ptr, line_prefix);
988 diff_words->minus.text.size = 0;
989 return;
990 }
991
992 diff_words->current_plus = diff_words->plus.text.ptr;
993 diff_words->last_minus = 0;
994
995 memset(&xpp, 0, sizeof(xpp));
996 memset(&xecfg, 0, sizeof(xecfg));
997 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
998 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
999 xpp.flags = 0;
1000 /* as only the hunk header will be parsed, we need a 0-context */
1001 xecfg.ctxlen = 0;
1002 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1003 &xpp, &xecfg);
1004 free(minus.ptr);
1005 free(plus.ptr);
1006 if (diff_words->current_plus != diff_words->plus.text.ptr +
1007 diff_words->plus.text.size) {
1008 if (color_words_output_graph_prefix(diff_words))
1009 fputs(line_prefix, diff_words->opt->file);
1010 fn_out_diff_words_write_helper(diff_words->opt->file,
1011 &style->ctx, style->newline,
1012 diff_words->plus.text.ptr + diff_words->plus.text.size
1013 - diff_words->current_plus, diff_words->current_plus,
1014 line_prefix);
1015 }
1016 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1017 }
1018
1019 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1020 static void diff_words_flush(struct emit_callback *ecbdata)
1021 {
1022 if (ecbdata->diff_words->minus.text.size ||
1023 ecbdata->diff_words->plus.text.size)
1024 diff_words_show(ecbdata->diff_words);
1025 }
1026
1027 static void diff_filespec_load_driver(struct diff_filespec *one)
1028 {
1029 /* Use already-loaded driver */
1030 if (one->driver)
1031 return;
1032
1033 if (S_ISREG(one->mode))
1034 one->driver = userdiff_find_by_path(one->path);
1035
1036 /* Fallback to default settings */
1037 if (!one->driver)
1038 one->driver = userdiff_find_by_name("default");
1039 }
1040
1041 static const char *userdiff_word_regex(struct diff_filespec *one)
1042 {
1043 diff_filespec_load_driver(one);
1044 return one->driver->word_regex;
1045 }
1046
1047 static void init_diff_words_data(struct emit_callback *ecbdata,
1048 struct diff_options *orig_opts,
1049 struct diff_filespec *one,
1050 struct diff_filespec *two)
1051 {
1052 int i;
1053 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1054 memcpy(o, orig_opts, sizeof(struct diff_options));
1055
1056 ecbdata->diff_words =
1057 xcalloc(1, sizeof(struct diff_words_data));
1058 ecbdata->diff_words->type = o->word_diff;
1059 ecbdata->diff_words->opt = o;
1060 if (!o->word_regex)
1061 o->word_regex = userdiff_word_regex(one);
1062 if (!o->word_regex)
1063 o->word_regex = userdiff_word_regex(two);
1064 if (!o->word_regex)
1065 o->word_regex = diff_word_regex_cfg;
1066 if (o->word_regex) {
1067 ecbdata->diff_words->word_regex = (regex_t *)
1068 xmalloc(sizeof(regex_t));
1069 if (regcomp(ecbdata->diff_words->word_regex,
1070 o->word_regex,
1071 REG_EXTENDED | REG_NEWLINE))
1072 die ("Invalid regular expression: %s",
1073 o->word_regex);
1074 }
1075 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1076 if (o->word_diff == diff_words_styles[i].type) {
1077 ecbdata->diff_words->style =
1078 &diff_words_styles[i];
1079 break;
1080 }
1081 }
1082 if (want_color(o->use_color)) {
1083 struct diff_words_style *st = ecbdata->diff_words->style;
1084 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1085 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1086 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1087 }
1088 }
1089
1090 static void free_diff_words_data(struct emit_callback *ecbdata)
1091 {
1092 if (ecbdata->diff_words) {
1093 diff_words_flush(ecbdata);
1094 free (ecbdata->diff_words->opt);
1095 free (ecbdata->diff_words->minus.text.ptr);
1096 free (ecbdata->diff_words->minus.orig);
1097 free (ecbdata->diff_words->plus.text.ptr);
1098 free (ecbdata->diff_words->plus.orig);
1099 if (ecbdata->diff_words->word_regex) {
1100 regfree(ecbdata->diff_words->word_regex);
1101 free(ecbdata->diff_words->word_regex);
1102 }
1103 free(ecbdata->diff_words);
1104 ecbdata->diff_words = NULL;
1105 }
1106 }
1107
1108 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1109 {
1110 if (want_color(diff_use_color))
1111 return diff_colors[ix];
1112 return "";
1113 }
1114
1115 const char *diff_line_prefix(struct diff_options *opt)
1116 {
1117 struct strbuf *msgbuf;
1118 if (!opt->output_prefix)
1119 return "";
1120
1121 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1122 return msgbuf->buf;
1123 }
1124
1125 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1126 {
1127 const char *cp;
1128 unsigned long allot;
1129 size_t l = len;
1130
1131 if (ecb->truncate)
1132 return ecb->truncate(line, len);
1133 cp = line;
1134 allot = l;
1135 while (0 < l) {
1136 (void) utf8_width(&cp, &l);
1137 if (!cp)
1138 break; /* truncated in the middle? */
1139 }
1140 return allot - l;
1141 }
1142
1143 static void find_lno(const char *line, struct emit_callback *ecbdata)
1144 {
1145 const char *p;
1146 ecbdata->lno_in_preimage = 0;
1147 ecbdata->lno_in_postimage = 0;
1148 p = strchr(line, '-');
1149 if (!p)
1150 return; /* cannot happen */
1151 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1152 p = strchr(p, '+');
1153 if (!p)
1154 return; /* cannot happen */
1155 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1156 }
1157
1158 static void fn_out_consume(void *priv, char *line, unsigned long len)
1159 {
1160 struct emit_callback *ecbdata = priv;
1161 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1162 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1163 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1164 struct diff_options *o = ecbdata->opt;
1165 const char *line_prefix = diff_line_prefix(o);
1166
1167 if (ecbdata->header) {
1168 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1169 strbuf_reset(ecbdata->header);
1170 ecbdata->header = NULL;
1171 }
1172 *(ecbdata->found_changesp) = 1;
1173
1174 if (ecbdata->label_path[0]) {
1175 const char *name_a_tab, *name_b_tab;
1176
1177 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1178 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1179
1180 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1181 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1182 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1183 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1184 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1185 }
1186
1187 if (diff_suppress_blank_empty
1188 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1189 line[0] = '\n';
1190 len = 1;
1191 }
1192
1193 if (line[0] == '@') {
1194 if (ecbdata->diff_words)
1195 diff_words_flush(ecbdata);
1196 len = sane_truncate_line(ecbdata, line, len);
1197 find_lno(line, ecbdata);
1198 emit_hunk_header(ecbdata, line, len);
1199 if (line[len-1] != '\n')
1200 putc('\n', ecbdata->opt->file);
1201 return;
1202 }
1203
1204 if (len < 1) {
1205 emit_line(ecbdata->opt, reset, reset, line, len);
1206 if (ecbdata->diff_words
1207 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1208 fputs("~\n", ecbdata->opt->file);
1209 return;
1210 }
1211
1212 if (ecbdata->diff_words) {
1213 if (line[0] == '-') {
1214 diff_words_append(line, len,
1215 &ecbdata->diff_words->minus);
1216 return;
1217 } else if (line[0] == '+') {
1218 diff_words_append(line, len,
1219 &ecbdata->diff_words->plus);
1220 return;
1221 } else if (starts_with(line, "\\ ")) {
1222 /*
1223 * Eat the "no newline at eof" marker as if we
1224 * saw a "+" or "-" line with nothing on it,
1225 * and return without diff_words_flush() to
1226 * defer processing. If this is the end of
1227 * preimage, more "+" lines may come after it.
1228 */
1229 return;
1230 }
1231 diff_words_flush(ecbdata);
1232 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1233 emit_line(ecbdata->opt, plain, reset, line, len);
1234 fputs("~\n", ecbdata->opt->file);
1235 } else {
1236 /*
1237 * Skip the prefix character, if any. With
1238 * diff_suppress_blank_empty, there may be
1239 * none.
1240 */
1241 if (line[0] != '\n') {
1242 line++;
1243 len--;
1244 }
1245 emit_line(ecbdata->opt, plain, reset, line, len);
1246 }
1247 return;
1248 }
1249
1250 if (line[0] != '+') {
1251 const char *color =
1252 diff_get_color(ecbdata->color_diff,
1253 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1254 ecbdata->lno_in_preimage++;
1255 if (line[0] == ' ')
1256 ecbdata->lno_in_postimage++;
1257 emit_line(ecbdata->opt, color, reset, line, len);
1258 } else {
1259 ecbdata->lno_in_postimage++;
1260 emit_add_line(reset, ecbdata, line + 1, len - 1);
1261 }
1262 }
1263
1264 static char *pprint_rename(const char *a, const char *b)
1265 {
1266 const char *old = a;
1267 const char *new = b;
1268 struct strbuf name = STRBUF_INIT;
1269 int pfx_length, sfx_length;
1270 int pfx_adjust_for_slash;
1271 int len_a = strlen(a);
1272 int len_b = strlen(b);
1273 int a_midlen, b_midlen;
1274 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1275 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1276
1277 if (qlen_a || qlen_b) {
1278 quote_c_style(a, &name, NULL, 0);
1279 strbuf_addstr(&name, " => ");
1280 quote_c_style(b, &name, NULL, 0);
1281 return strbuf_detach(&name, NULL);
1282 }
1283
1284 /* Find common prefix */
1285 pfx_length = 0;
1286 while (*old && *new && *old == *new) {
1287 if (*old == '/')
1288 pfx_length = old - a + 1;
1289 old++;
1290 new++;
1291 }
1292
1293 /* Find common suffix */
1294 old = a + len_a;
1295 new = b + len_b;
1296 sfx_length = 0;
1297 /*
1298 * If there is a common prefix, it must end in a slash. In
1299 * that case we let this loop run 1 into the prefix to see the
1300 * same slash.
1301 *
1302 * If there is no common prefix, we cannot do this as it would
1303 * underrun the input strings.
1304 */
1305 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1306 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1307 b + pfx_length - pfx_adjust_for_slash <= new &&
1308 *old == *new) {
1309 if (*old == '/')
1310 sfx_length = len_a - (old - a);
1311 old--;
1312 new--;
1313 }
1314
1315 /*
1316 * pfx{mid-a => mid-b}sfx
1317 * {pfx-a => pfx-b}sfx
1318 * pfx{sfx-a => sfx-b}
1319 * name-a => name-b
1320 */
1321 a_midlen = len_a - pfx_length - sfx_length;
1322 b_midlen = len_b - pfx_length - sfx_length;
1323 if (a_midlen < 0)
1324 a_midlen = 0;
1325 if (b_midlen < 0)
1326 b_midlen = 0;
1327
1328 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1329 if (pfx_length + sfx_length) {
1330 strbuf_add(&name, a, pfx_length);
1331 strbuf_addch(&name, '{');
1332 }
1333 strbuf_add(&name, a + pfx_length, a_midlen);
1334 strbuf_addstr(&name, " => ");
1335 strbuf_add(&name, b + pfx_length, b_midlen);
1336 if (pfx_length + sfx_length) {
1337 strbuf_addch(&name, '}');
1338 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1339 }
1340 return strbuf_detach(&name, NULL);
1341 }
1342
1343 struct diffstat_t {
1344 int nr;
1345 int alloc;
1346 struct diffstat_file {
1347 char *from_name;
1348 char *name;
1349 char *print_name;
1350 unsigned is_unmerged:1;
1351 unsigned is_binary:1;
1352 unsigned is_renamed:1;
1353 unsigned is_interesting:1;
1354 uintmax_t added, deleted;
1355 } **files;
1356 };
1357
1358 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1359 const char *name_a,
1360 const char *name_b)
1361 {
1362 struct diffstat_file *x;
1363 x = xcalloc(sizeof (*x), 1);
1364 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1365 diffstat->files[diffstat->nr++] = x;
1366 if (name_b) {
1367 x->from_name = xstrdup(name_a);
1368 x->name = xstrdup(name_b);
1369 x->is_renamed = 1;
1370 }
1371 else {
1372 x->from_name = NULL;
1373 x->name = xstrdup(name_a);
1374 }
1375 return x;
1376 }
1377
1378 static void diffstat_consume(void *priv, char *line, unsigned long len)
1379 {
1380 struct diffstat_t *diffstat = priv;
1381 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1382
1383 if (line[0] == '+')
1384 x->added++;
1385 else if (line[0] == '-')
1386 x->deleted++;
1387 }
1388
1389 const char mime_boundary_leader[] = "------------";
1390
1391 static int scale_linear(int it, int width, int max_change)
1392 {
1393 if (!it)
1394 return 0;
1395 /*
1396 * make sure that at least one '-' or '+' is printed if
1397 * there is any change to this path. The easiest way is to
1398 * scale linearly as if the alloted width is one column shorter
1399 * than it is, and then add 1 to the result.
1400 */
1401 return 1 + (it * (width - 1) / max_change);
1402 }
1403
1404 static void show_name(FILE *file,
1405 const char *prefix, const char *name, int len)
1406 {
1407 fprintf(file, " %s%-*s |", prefix, len, name);
1408 }
1409
1410 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1411 {
1412 if (cnt <= 0)
1413 return;
1414 fprintf(file, "%s", set);
1415 while (cnt--)
1416 putc(ch, file);
1417 fprintf(file, "%s", reset);
1418 }
1419
1420 static void fill_print_name(struct diffstat_file *file)
1421 {
1422 char *pname;
1423
1424 if (file->print_name)
1425 return;
1426
1427 if (!file->is_renamed) {
1428 struct strbuf buf = STRBUF_INIT;
1429 if (quote_c_style(file->name, &buf, NULL, 0)) {
1430 pname = strbuf_detach(&buf, NULL);
1431 } else {
1432 pname = file->name;
1433 strbuf_release(&buf);
1434 }
1435 } else {
1436 pname = pprint_rename(file->from_name, file->name);
1437 }
1438 file->print_name = pname;
1439 }
1440
1441 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1442 {
1443 struct strbuf sb = STRBUF_INIT;
1444 int ret;
1445
1446 if (!files) {
1447 assert(insertions == 0 && deletions == 0);
1448 return fprintf(fp, "%s\n", " 0 files changed");
1449 }
1450
1451 strbuf_addf(&sb,
1452 (files == 1) ? " %d file changed" : " %d files changed",
1453 files);
1454
1455 /*
1456 * For binary diff, the caller may want to print "x files
1457 * changed" with insertions == 0 && deletions == 0.
1458 *
1459 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1460 * is probably less confusing (i.e skip over "2 files changed
1461 * but nothing about added/removed lines? Is this a bug in Git?").
1462 */
1463 if (insertions || deletions == 0) {
1464 strbuf_addf(&sb,
1465 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1466 insertions);
1467 }
1468
1469 if (deletions || insertions == 0) {
1470 strbuf_addf(&sb,
1471 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1472 deletions);
1473 }
1474 strbuf_addch(&sb, '\n');
1475 ret = fputs(sb.buf, fp);
1476 strbuf_release(&sb);
1477 return ret;
1478 }
1479
1480 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1481 {
1482 int i, len, add, del, adds = 0, dels = 0;
1483 uintmax_t max_change = 0, max_len = 0;
1484 int total_files = data->nr, count;
1485 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1486 const char *reset, *add_c, *del_c;
1487 const char *line_prefix = "";
1488 int extra_shown = 0;
1489
1490 if (data->nr == 0)
1491 return;
1492
1493 line_prefix = diff_line_prefix(options);
1494 count = options->stat_count ? options->stat_count : data->nr;
1495
1496 reset = diff_get_color_opt(options, DIFF_RESET);
1497 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1498 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1499
1500 /*
1501 * Find the longest filename and max number of changes
1502 */
1503 for (i = 0; (i < count) && (i < data->nr); i++) {
1504 struct diffstat_file *file = data->files[i];
1505 uintmax_t change = file->added + file->deleted;
1506
1507 if (!file->is_interesting && (change == 0)) {
1508 count++; /* not shown == room for one more */
1509 continue;
1510 }
1511 fill_print_name(file);
1512 len = strlen(file->print_name);
1513 if (max_len < len)
1514 max_len = len;
1515
1516 if (file->is_unmerged) {
1517 /* "Unmerged" is 8 characters */
1518 bin_width = bin_width < 8 ? 8 : bin_width;
1519 continue;
1520 }
1521 if (file->is_binary) {
1522 /* "Bin XXX -> YYY bytes" */
1523 int w = 14 + decimal_width(file->added)
1524 + decimal_width(file->deleted);
1525 bin_width = bin_width < w ? w : bin_width;
1526 /* Display change counts aligned with "Bin" */
1527 number_width = 3;
1528 continue;
1529 }
1530
1531 if (max_change < change)
1532 max_change = change;
1533 }
1534 count = i; /* where we can stop scanning in data->files[] */
1535
1536 /*
1537 * We have width = stat_width or term_columns() columns total.
1538 * We want a maximum of min(max_len, stat_name_width) for the name part.
1539 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1540 * We also need 1 for " " and 4 + decimal_width(max_change)
1541 * for " | NNNN " and one the empty column at the end, altogether
1542 * 6 + decimal_width(max_change).
1543 *
1544 * If there's not enough space, we will use the smaller of
1545 * stat_name_width (if set) and 5/8*width for the filename,
1546 * and the rest for constant elements + graph part, but no more
1547 * than stat_graph_width for the graph part.
1548 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1549 * for the standard terminal size).
1550 *
1551 * In other words: stat_width limits the maximum width, and
1552 * stat_name_width fixes the maximum width of the filename,
1553 * and is also used to divide available columns if there
1554 * aren't enough.
1555 *
1556 * Binary files are displayed with "Bin XXX -> YYY bytes"
1557 * instead of the change count and graph. This part is treated
1558 * similarly to the graph part, except that it is not
1559 * "scaled". If total width is too small to accommodate the
1560 * guaranteed minimum width of the filename part and the
1561 * separators and this message, this message will "overflow"
1562 * making the line longer than the maximum width.
1563 */
1564
1565 if (options->stat_width == -1)
1566 width = term_columns() - options->output_prefix_length;
1567 else
1568 width = options->stat_width ? options->stat_width : 80;
1569 number_width = decimal_width(max_change) > number_width ?
1570 decimal_width(max_change) : number_width;
1571
1572 if (options->stat_graph_width == -1)
1573 options->stat_graph_width = diff_stat_graph_width;
1574
1575 /*
1576 * Guarantee 3/8*16==6 for the graph part
1577 * and 5/8*16==10 for the filename part
1578 */
1579 if (width < 16 + 6 + number_width)
1580 width = 16 + 6 + number_width;
1581
1582 /*
1583 * First assign sizes that are wanted, ignoring available width.
1584 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1585 * starting from "XXX" should fit in graph_width.
1586 */
1587 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1588 if (options->stat_graph_width &&
1589 options->stat_graph_width < graph_width)
1590 graph_width = options->stat_graph_width;
1591
1592 name_width = (options->stat_name_width > 0 &&
1593 options->stat_name_width < max_len) ?
1594 options->stat_name_width : max_len;
1595
1596 /*
1597 * Adjust adjustable widths not to exceed maximum width
1598 */
1599 if (name_width + number_width + 6 + graph_width > width) {
1600 if (graph_width > width * 3/8 - number_width - 6) {
1601 graph_width = width * 3/8 - number_width - 6;
1602 if (graph_width < 6)
1603 graph_width = 6;
1604 }
1605
1606 if (options->stat_graph_width &&
1607 graph_width > options->stat_graph_width)
1608 graph_width = options->stat_graph_width;
1609 if (name_width > width - number_width - 6 - graph_width)
1610 name_width = width - number_width - 6 - graph_width;
1611 else
1612 graph_width = width - number_width - 6 - name_width;
1613 }
1614
1615 /*
1616 * From here name_width is the width of the name area,
1617 * and graph_width is the width of the graph area.
1618 * max_change is used to scale graph properly.
1619 */
1620 for (i = 0; i < count; i++) {
1621 const char *prefix = "";
1622 struct diffstat_file *file = data->files[i];
1623 char *name = file->print_name;
1624 uintmax_t added = file->added;
1625 uintmax_t deleted = file->deleted;
1626 int name_len;
1627
1628 if (!file->is_interesting && (added + deleted == 0))
1629 continue;
1630
1631 /*
1632 * "scale" the filename
1633 */
1634 len = name_width;
1635 name_len = strlen(name);
1636 if (name_width < name_len) {
1637 char *slash;
1638 prefix = "...";
1639 len -= 3;
1640 name += name_len - len;
1641 slash = strchr(name, '/');
1642 if (slash)
1643 name = slash;
1644 }
1645
1646 if (file->is_binary) {
1647 fprintf(options->file, "%s", line_prefix);
1648 show_name(options->file, prefix, name, len);
1649 fprintf(options->file, " %*s", number_width, "Bin");
1650 if (!added && !deleted) {
1651 putc('\n', options->file);
1652 continue;
1653 }
1654 fprintf(options->file, " %s%"PRIuMAX"%s",
1655 del_c, deleted, reset);
1656 fprintf(options->file, " -> ");
1657 fprintf(options->file, "%s%"PRIuMAX"%s",
1658 add_c, added, reset);
1659 fprintf(options->file, " bytes");
1660 fprintf(options->file, "\n");
1661 continue;
1662 }
1663 else if (file->is_unmerged) {
1664 fprintf(options->file, "%s", line_prefix);
1665 show_name(options->file, prefix, name, len);
1666 fprintf(options->file, " Unmerged\n");
1667 continue;
1668 }
1669
1670 /*
1671 * scale the add/delete
1672 */
1673 add = added;
1674 del = deleted;
1675
1676 if (graph_width <= max_change) {
1677 int total = scale_linear(add + del, graph_width, max_change);
1678 if (total < 2 && add && del)
1679 /* width >= 2 due to the sanity check */
1680 total = 2;
1681 if (add < del) {
1682 add = scale_linear(add, graph_width, max_change);
1683 del = total - add;
1684 } else {
1685 del = scale_linear(del, graph_width, max_change);
1686 add = total - del;
1687 }
1688 }
1689 fprintf(options->file, "%s", line_prefix);
1690 show_name(options->file, prefix, name, len);
1691 fprintf(options->file, " %*"PRIuMAX"%s",
1692 number_width, added + deleted,
1693 added + deleted ? " " : "");
1694 show_graph(options->file, '+', add, add_c, reset);
1695 show_graph(options->file, '-', del, del_c, reset);
1696 fprintf(options->file, "\n");
1697 }
1698
1699 for (i = 0; i < data->nr; i++) {
1700 struct diffstat_file *file = data->files[i];
1701 uintmax_t added = file->added;
1702 uintmax_t deleted = file->deleted;
1703
1704 if (file->is_unmerged ||
1705 (!file->is_interesting && (added + deleted == 0))) {
1706 total_files--;
1707 continue;
1708 }
1709
1710 if (!file->is_binary) {
1711 adds += added;
1712 dels += deleted;
1713 }
1714 if (i < count)
1715 continue;
1716 if (!extra_shown)
1717 fprintf(options->file, "%s ...\n", line_prefix);
1718 extra_shown = 1;
1719 }
1720 fprintf(options->file, "%s", line_prefix);
1721 print_stat_summary(options->file, total_files, adds, dels);
1722 }
1723
1724 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1725 {
1726 int i, adds = 0, dels = 0, total_files = data->nr;
1727
1728 if (data->nr == 0)
1729 return;
1730
1731 for (i = 0; i < data->nr; i++) {
1732 int added = data->files[i]->added;
1733 int deleted= data->files[i]->deleted;
1734
1735 if (data->files[i]->is_unmerged ||
1736 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1737 total_files--;
1738 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1739 adds += added;
1740 dels += deleted;
1741 }
1742 }
1743 fprintf(options->file, "%s", diff_line_prefix(options));
1744 print_stat_summary(options->file, total_files, adds, dels);
1745 }
1746
1747 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1748 {
1749 int i;
1750
1751 if (data->nr == 0)
1752 return;
1753
1754 for (i = 0; i < data->nr; i++) {
1755 struct diffstat_file *file = data->files[i];
1756
1757 fprintf(options->file, "%s", diff_line_prefix(options));
1758
1759 if (file->is_binary)
1760 fprintf(options->file, "-\t-\t");
1761 else
1762 fprintf(options->file,
1763 "%"PRIuMAX"\t%"PRIuMAX"\t",
1764 file->added, file->deleted);
1765 if (options->line_termination) {
1766 fill_print_name(file);
1767 if (!file->is_renamed)
1768 write_name_quoted(file->name, options->file,
1769 options->line_termination);
1770 else {
1771 fputs(file->print_name, options->file);
1772 putc(options->line_termination, options->file);
1773 }
1774 } else {
1775 if (file->is_renamed) {
1776 putc('\0', options->file);
1777 write_name_quoted(file->from_name, options->file, '\0');
1778 }
1779 write_name_quoted(file->name, options->file, '\0');
1780 }
1781 }
1782 }
1783
1784 struct dirstat_file {
1785 const char *name;
1786 unsigned long changed;
1787 };
1788
1789 struct dirstat_dir {
1790 struct dirstat_file *files;
1791 int alloc, nr, permille, cumulative;
1792 };
1793
1794 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1795 unsigned long changed, const char *base, int baselen)
1796 {
1797 unsigned long this_dir = 0;
1798 unsigned int sources = 0;
1799 const char *line_prefix = diff_line_prefix(opt);
1800
1801 while (dir->nr) {
1802 struct dirstat_file *f = dir->files;
1803 int namelen = strlen(f->name);
1804 unsigned long this;
1805 char *slash;
1806
1807 if (namelen < baselen)
1808 break;
1809 if (memcmp(f->name, base, baselen))
1810 break;
1811 slash = strchr(f->name + baselen, '/');
1812 if (slash) {
1813 int newbaselen = slash + 1 - f->name;
1814 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1815 sources++;
1816 } else {
1817 this = f->changed;
1818 dir->files++;
1819 dir->nr--;
1820 sources += 2;
1821 }
1822 this_dir += this;
1823 }
1824
1825 /*
1826 * We don't report dirstat's for
1827 * - the top level
1828 * - or cases where everything came from a single directory
1829 * under this directory (sources == 1).
1830 */
1831 if (baselen && sources != 1) {
1832 if (this_dir) {
1833 int permille = this_dir * 1000 / changed;
1834 if (permille >= dir->permille) {
1835 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1836 permille / 10, permille % 10, baselen, base);
1837 if (!dir->cumulative)
1838 return 0;
1839 }
1840 }
1841 }
1842 return this_dir;
1843 }
1844
1845 static int dirstat_compare(const void *_a, const void *_b)
1846 {
1847 const struct dirstat_file *a = _a;
1848 const struct dirstat_file *b = _b;
1849 return strcmp(a->name, b->name);
1850 }
1851
1852 static void show_dirstat(struct diff_options *options)
1853 {
1854 int i;
1855 unsigned long changed;
1856 struct dirstat_dir dir;
1857 struct diff_queue_struct *q = &diff_queued_diff;
1858
1859 dir.files = NULL;
1860 dir.alloc = 0;
1861 dir.nr = 0;
1862 dir.permille = options->dirstat_permille;
1863 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1864
1865 changed = 0;
1866 for (i = 0; i < q->nr; i++) {
1867 struct diff_filepair *p = q->queue[i];
1868 const char *name;
1869 unsigned long copied, added, damage;
1870 int content_changed;
1871
1872 name = p->two->path ? p->two->path : p->one->path;
1873
1874 if (p->one->sha1_valid && p->two->sha1_valid)
1875 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1876 else
1877 content_changed = 1;
1878
1879 if (!content_changed) {
1880 /*
1881 * The SHA1 has not changed, so pre-/post-content is
1882 * identical. We can therefore skip looking at the
1883 * file contents altogether.
1884 */
1885 damage = 0;
1886 goto found_damage;
1887 }
1888
1889 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1890 /*
1891 * In --dirstat-by-file mode, we don't really need to
1892 * look at the actual file contents at all.
1893 * The fact that the SHA1 changed is enough for us to
1894 * add this file to the list of results
1895 * (with each file contributing equal damage).
1896 */
1897 damage = 1;
1898 goto found_damage;
1899 }
1900
1901 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1902 diff_populate_filespec(p->one, 0);
1903 diff_populate_filespec(p->two, 0);
1904 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1905 &copied, &added);
1906 diff_free_filespec_data(p->one);
1907 diff_free_filespec_data(p->two);
1908 } else if (DIFF_FILE_VALID(p->one)) {
1909 diff_populate_filespec(p->one, 1);
1910 copied = added = 0;
1911 diff_free_filespec_data(p->one);
1912 } else if (DIFF_FILE_VALID(p->two)) {
1913 diff_populate_filespec(p->two, 1);
1914 copied = 0;
1915 added = p->two->size;
1916 diff_free_filespec_data(p->two);
1917 } else
1918 continue;
1919
1920 /*
1921 * Original minus copied is the removed material,
1922 * added is the new material. They are both damages
1923 * made to the preimage.
1924 * If the resulting damage is zero, we know that
1925 * diffcore_count_changes() considers the two entries to
1926 * be identical, but since content_changed is true, we
1927 * know that there must have been _some_ kind of change,
1928 * so we force all entries to have damage > 0.
1929 */
1930 damage = (p->one->size - copied) + added;
1931 if (!damage)
1932 damage = 1;
1933
1934 found_damage:
1935 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1936 dir.files[dir.nr].name = name;
1937 dir.files[dir.nr].changed = damage;
1938 changed += damage;
1939 dir.nr++;
1940 }
1941
1942 /* This can happen even with many files, if everything was renames */
1943 if (!changed)
1944 return;
1945
1946 /* Show all directories with more than x% of the changes */
1947 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1948 gather_dirstat(options, &dir, changed, "", 0);
1949 }
1950
1951 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1952 {
1953 int i;
1954 unsigned long changed;
1955 struct dirstat_dir dir;
1956
1957 if (data->nr == 0)
1958 return;
1959
1960 dir.files = NULL;
1961 dir.alloc = 0;
1962 dir.nr = 0;
1963 dir.permille = options->dirstat_permille;
1964 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1965
1966 changed = 0;
1967 for (i = 0; i < data->nr; i++) {
1968 struct diffstat_file *file = data->files[i];
1969 unsigned long damage = file->added + file->deleted;
1970 if (file->is_binary)
1971 /*
1972 * binary files counts bytes, not lines. Must find some
1973 * way to normalize binary bytes vs. textual lines.
1974 * The following heuristic assumes that there are 64
1975 * bytes per "line".
1976 * This is stupid and ugly, but very cheap...
1977 */
1978 damage = (damage + 63) / 64;
1979 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1980 dir.files[dir.nr].name = file->name;
1981 dir.files[dir.nr].changed = damage;
1982 changed += damage;
1983 dir.nr++;
1984 }
1985
1986 /* This can happen even with many files, if everything was renames */
1987 if (!changed)
1988 return;
1989
1990 /* Show all directories with more than x% of the changes */
1991 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1992 gather_dirstat(options, &dir, changed, "", 0);
1993 }
1994
1995 static void free_diffstat_info(struct diffstat_t *diffstat)
1996 {
1997 int i;
1998 for (i = 0; i < diffstat->nr; i++) {
1999 struct diffstat_file *f = diffstat->files[i];
2000 if (f->name != f->print_name)
2001 free(f->print_name);
2002 free(f->name);
2003 free(f->from_name);
2004 free(f);
2005 }
2006 free(diffstat->files);
2007 }
2008
2009 struct checkdiff_t {
2010 const char *filename;
2011 int lineno;
2012 int conflict_marker_size;
2013 struct diff_options *o;
2014 unsigned ws_rule;
2015 unsigned status;
2016 };
2017
2018 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2019 {
2020 char firstchar;
2021 int cnt;
2022
2023 if (len < marker_size + 1)
2024 return 0;
2025 firstchar = line[0];
2026 switch (firstchar) {
2027 case '=': case '>': case '<': case '|':
2028 break;
2029 default:
2030 return 0;
2031 }
2032 for (cnt = 1; cnt < marker_size; cnt++)
2033 if (line[cnt] != firstchar)
2034 return 0;
2035 /* line[1] thru line[marker_size-1] are same as firstchar */
2036 if (len < marker_size + 1 || !isspace(line[marker_size]))
2037 return 0;
2038 return 1;
2039 }
2040
2041 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2042 {
2043 struct checkdiff_t *data = priv;
2044 int marker_size = data->conflict_marker_size;
2045 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2046 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2047 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2048 char *err;
2049 const char *line_prefix;
2050
2051 assert(data->o);
2052 line_prefix = diff_line_prefix(data->o);
2053
2054 if (line[0] == '+') {
2055 unsigned bad;
2056 data->lineno++;
2057 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2058 data->status |= 1;
2059 fprintf(data->o->file,
2060 "%s%s:%d: leftover conflict marker\n",
2061 line_prefix, data->filename, data->lineno);
2062 }
2063 bad = ws_check(line + 1, len - 1, data->ws_rule);
2064 if (!bad)
2065 return;
2066 data->status |= bad;
2067 err = whitespace_error_string(bad);
2068 fprintf(data->o->file, "%s%s:%d: %s.\n",
2069 line_prefix, data->filename, data->lineno, err);
2070 free(err);
2071 emit_line(data->o, set, reset, line, 1);
2072 ws_check_emit(line + 1, len - 1, data->ws_rule,
2073 data->o->file, set, reset, ws);
2074 } else if (line[0] == ' ') {
2075 data->lineno++;
2076 } else if (line[0] == '@') {
2077 char *plus = strchr(line, '+');
2078 if (plus)
2079 data->lineno = strtol(plus, NULL, 10) - 1;
2080 else
2081 die("invalid diff");
2082 }
2083 }
2084
2085 static unsigned char *deflate_it(char *data,
2086 unsigned long size,
2087 unsigned long *result_size)
2088 {
2089 int bound;
2090 unsigned char *deflated;
2091 git_zstream stream;
2092
2093 memset(&stream, 0, sizeof(stream));
2094 git_deflate_init(&stream, zlib_compression_level);
2095 bound = git_deflate_bound(&stream, size);
2096 deflated = xmalloc(bound);
2097 stream.next_out = deflated;
2098 stream.avail_out = bound;
2099
2100 stream.next_in = (unsigned char *)data;
2101 stream.avail_in = size;
2102 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2103 ; /* nothing */
2104 git_deflate_end(&stream);
2105 *result_size = stream.total_out;
2106 return deflated;
2107 }
2108
2109 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2110 const char *prefix)
2111 {
2112 void *cp;
2113 void *delta;
2114 void *deflated;
2115 void *data;
2116 unsigned long orig_size;
2117 unsigned long delta_size;
2118 unsigned long deflate_size;
2119 unsigned long data_size;
2120
2121 /* We could do deflated delta, or we could do just deflated two,
2122 * whichever is smaller.
2123 */
2124 delta = NULL;
2125 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2126 if (one->size && two->size) {
2127 delta = diff_delta(one->ptr, one->size,
2128 two->ptr, two->size,
2129 &delta_size, deflate_size);
2130 if (delta) {
2131 void *to_free = delta;
2132 orig_size = delta_size;
2133 delta = deflate_it(delta, delta_size, &delta_size);
2134 free(to_free);
2135 }
2136 }
2137
2138 if (delta && delta_size < deflate_size) {
2139 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2140 free(deflated);
2141 data = delta;
2142 data_size = delta_size;
2143 }
2144 else {
2145 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2146 free(delta);
2147 data = deflated;
2148 data_size = deflate_size;
2149 }
2150
2151 /* emit data encoded in base85 */
2152 cp = data;
2153 while (data_size) {
2154 int bytes = (52 < data_size) ? 52 : data_size;
2155 char line[70];
2156 data_size -= bytes;
2157 if (bytes <= 26)
2158 line[0] = bytes + 'A' - 1;
2159 else
2160 line[0] = bytes - 26 + 'a' - 1;
2161 encode_85(line + 1, cp, bytes);
2162 cp = (char *) cp + bytes;
2163 fprintf(file, "%s", prefix);
2164 fputs(line, file);
2165 fputc('\n', file);
2166 }
2167 fprintf(file, "%s\n", prefix);
2168 free(data);
2169 }
2170
2171 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2172 const char *prefix)
2173 {
2174 fprintf(file, "%sGIT binary patch\n", prefix);
2175 emit_binary_diff_body(file, one, two, prefix);
2176 emit_binary_diff_body(file, two, one, prefix);
2177 }
2178
2179 int diff_filespec_is_binary(struct diff_filespec *one)
2180 {
2181 if (one->is_binary == -1) {
2182 diff_filespec_load_driver(one);
2183 if (one->driver->binary != -1)
2184 one->is_binary = one->driver->binary;
2185 else {
2186 if (!one->data && DIFF_FILE_VALID(one))
2187 diff_populate_filespec(one, 0);
2188 if (one->data)
2189 one->is_binary = buffer_is_binary(one->data,
2190 one->size);
2191 if (one->is_binary == -1)
2192 one->is_binary = 0;
2193 }
2194 }
2195 return one->is_binary;
2196 }
2197
2198 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2199 {
2200 diff_filespec_load_driver(one);
2201 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2202 }
2203
2204 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2205 {
2206 if (!options->a_prefix)
2207 options->a_prefix = a;
2208 if (!options->b_prefix)
2209 options->b_prefix = b;
2210 }
2211
2212 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2213 {
2214 if (!DIFF_FILE_VALID(one))
2215 return NULL;
2216
2217 diff_filespec_load_driver(one);
2218 return userdiff_get_textconv(one->driver);
2219 }
2220
2221 static void builtin_diff(const char *name_a,
2222 const char *name_b,
2223 struct diff_filespec *one,
2224 struct diff_filespec *two,
2225 const char *xfrm_msg,
2226 int must_show_header,
2227 struct diff_options *o,
2228 int complete_rewrite)
2229 {
2230 mmfile_t mf1, mf2;
2231 const char *lbl[2];
2232 char *a_one, *b_two;
2233 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2234 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2235 const char *a_prefix, *b_prefix;
2236 struct userdiff_driver *textconv_one = NULL;
2237 struct userdiff_driver *textconv_two = NULL;
2238 struct strbuf header = STRBUF_INIT;
2239 const char *line_prefix = diff_line_prefix(o);
2240
2241 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2242 (!one->mode || S_ISGITLINK(one->mode)) &&
2243 (!two->mode || S_ISGITLINK(two->mode))) {
2244 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2245 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2246 show_submodule_summary(o->file, one->path ? one->path : two->path,
2247 line_prefix,
2248 one->sha1, two->sha1, two->dirty_submodule,
2249 meta, del, add, reset);
2250 return;
2251 }
2252
2253 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2254 textconv_one = get_textconv(one);
2255 textconv_two = get_textconv(two);
2256 }
2257
2258 diff_set_mnemonic_prefix(o, "a/", "b/");
2259 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2260 a_prefix = o->b_prefix;
2261 b_prefix = o->a_prefix;
2262 } else {
2263 a_prefix = o->a_prefix;
2264 b_prefix = o->b_prefix;
2265 }
2266
2267 /* Never use a non-valid filename anywhere if at all possible */
2268 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2269 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2270
2271 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2272 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2273 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2274 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2275 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2276 if (lbl[0][0] == '/') {
2277 /* /dev/null */
2278 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2279 if (xfrm_msg)
2280 strbuf_addstr(&header, xfrm_msg);
2281 must_show_header = 1;
2282 }
2283 else if (lbl[1][0] == '/') {
2284 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2285 if (xfrm_msg)
2286 strbuf_addstr(&header, xfrm_msg);
2287 must_show_header = 1;
2288 }
2289 else {
2290 if (one->mode != two->mode) {
2291 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2292 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2293 must_show_header = 1;
2294 }
2295 if (xfrm_msg)
2296 strbuf_addstr(&header, xfrm_msg);
2297
2298 /*
2299 * we do not run diff between different kind
2300 * of objects.
2301 */
2302 if ((one->mode ^ two->mode) & S_IFMT)
2303 goto free_ab_and_return;
2304 if (complete_rewrite &&
2305 (textconv_one || !diff_filespec_is_binary(one)) &&
2306 (textconv_two || !diff_filespec_is_binary(two))) {
2307 fprintf(o->file, "%s", header.buf);
2308 strbuf_reset(&header);
2309 emit_rewrite_diff(name_a, name_b, one, two,
2310 textconv_one, textconv_two, o);
2311 o->found_changes = 1;
2312 goto free_ab_and_return;
2313 }
2314 }
2315
2316 if (o->irreversible_delete && lbl[1][0] == '/') {
2317 fprintf(o->file, "%s", header.buf);
2318 strbuf_reset(&header);
2319 goto free_ab_and_return;
2320 } else if (!DIFF_OPT_TST(o, TEXT) &&
2321 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2322 (!textconv_two && diff_filespec_is_binary(two)) )) {
2323 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2324 die("unable to read files to diff");
2325 /* Quite common confusing case */
2326 if (mf1.size == mf2.size &&
2327 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2328 if (must_show_header)
2329 fprintf(o->file, "%s", header.buf);
2330 goto free_ab_and_return;
2331 }
2332 fprintf(o->file, "%s", header.buf);
2333 strbuf_reset(&header);
2334 if (DIFF_OPT_TST(o, BINARY))
2335 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2336 else
2337 fprintf(o->file, "%sBinary files %s and %s differ\n",
2338 line_prefix, lbl[0], lbl[1]);
2339 o->found_changes = 1;
2340 } else {
2341 /* Crazy xdl interfaces.. */
2342 const char *diffopts = getenv("GIT_DIFF_OPTS");
2343 xpparam_t xpp;
2344 xdemitconf_t xecfg;
2345 struct emit_callback ecbdata;
2346 const struct userdiff_funcname *pe;
2347
2348 if (must_show_header) {
2349 fprintf(o->file, "%s", header.buf);
2350 strbuf_reset(&header);
2351 }
2352
2353 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2354 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2355
2356 pe = diff_funcname_pattern(one);
2357 if (!pe)
2358 pe = diff_funcname_pattern(two);
2359
2360 memset(&xpp, 0, sizeof(xpp));
2361 memset(&xecfg, 0, sizeof(xecfg));
2362 memset(&ecbdata, 0, sizeof(ecbdata));
2363 ecbdata.label_path = lbl;
2364 ecbdata.color_diff = want_color(o->use_color);
2365 ecbdata.found_changesp = &o->found_changes;
2366 ecbdata.ws_rule = whitespace_rule(name_b);
2367 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2368 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2369 ecbdata.opt = o;
2370 ecbdata.header = header.len ? &header : NULL;
2371 xpp.flags = o->xdl_opts;
2372 xecfg.ctxlen = o->context;
2373 xecfg.interhunkctxlen = o->interhunkcontext;
2374 xecfg.flags = XDL_EMIT_FUNCNAMES;
2375 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2376 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2377 if (pe)
2378 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2379 if (!diffopts)
2380 ;
2381 else if (starts_with(diffopts, "--unified="))
2382 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2383 else if (starts_with(diffopts, "-u"))
2384 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2385 if (o->word_diff)
2386 init_diff_words_data(&ecbdata, o, one, two);
2387 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2388 &xpp, &xecfg);
2389 if (o->word_diff)
2390 free_diff_words_data(&ecbdata);
2391 if (textconv_one)
2392 free(mf1.ptr);
2393 if (textconv_two)
2394 free(mf2.ptr);
2395 xdiff_clear_find_func(&xecfg);
2396 }
2397
2398 free_ab_and_return:
2399 strbuf_release(&header);
2400 diff_free_filespec_data(one);
2401 diff_free_filespec_data(two);
2402 free(a_one);
2403 free(b_two);
2404 return;
2405 }
2406
2407 static void builtin_diffstat(const char *name_a, const char *name_b,
2408 struct diff_filespec *one,
2409 struct diff_filespec *two,
2410 struct diffstat_t *diffstat,
2411 struct diff_options *o,
2412 struct diff_filepair *p)
2413 {
2414 mmfile_t mf1, mf2;
2415 struct diffstat_file *data;
2416 int same_contents;
2417 int complete_rewrite = 0;
2418
2419 if (!DIFF_PAIR_UNMERGED(p)) {
2420 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2421 complete_rewrite = 1;
2422 }
2423
2424 data = diffstat_add(diffstat, name_a, name_b);
2425 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2426
2427 if (!one || !two) {
2428 data->is_unmerged = 1;
2429 return;
2430 }
2431
2432 same_contents = !hashcmp(one->sha1, two->sha1);
2433
2434 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2435 data->is_binary = 1;
2436 if (same_contents) {
2437 data->added = 0;
2438 data->deleted = 0;
2439 } else {
2440 data->added = diff_filespec_size(two);
2441 data->deleted = diff_filespec_size(one);
2442 }
2443 }
2444
2445 else if (complete_rewrite) {
2446 diff_populate_filespec(one, 0);
2447 diff_populate_filespec(two, 0);
2448 data->deleted = count_lines(one->data, one->size);
2449 data->added = count_lines(two->data, two->size);
2450 }
2451
2452 else if (!same_contents) {
2453 /* Crazy xdl interfaces.. */
2454 xpparam_t xpp;
2455 xdemitconf_t xecfg;
2456
2457 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2458 die("unable to read files to diff");
2459
2460 memset(&xpp, 0, sizeof(xpp));
2461 memset(&xecfg, 0, sizeof(xecfg));
2462 xpp.flags = o->xdl_opts;
2463 xecfg.ctxlen = o->context;
2464 xecfg.interhunkctxlen = o->interhunkcontext;
2465 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2466 &xpp, &xecfg);
2467 }
2468
2469 diff_free_filespec_data(one);
2470 diff_free_filespec_data(two);
2471 }
2472
2473 static void builtin_checkdiff(const char *name_a, const char *name_b,
2474 const char *attr_path,
2475 struct diff_filespec *one,
2476 struct diff_filespec *two,
2477 struct diff_options *o)
2478 {
2479 mmfile_t mf1, mf2;
2480 struct checkdiff_t data;
2481
2482 if (!two)
2483 return;
2484
2485 memset(&data, 0, sizeof(data));
2486 data.filename = name_b ? name_b : name_a;
2487 data.lineno = 0;
2488 data.o = o;
2489 data.ws_rule = whitespace_rule(attr_path);
2490 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2491
2492 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2493 die("unable to read files to diff");
2494
2495 /*
2496 * All the other codepaths check both sides, but not checking
2497 * the "old" side here is deliberate. We are checking the newly
2498 * introduced changes, and as long as the "new" side is text, we
2499 * can and should check what it introduces.
2500 */
2501 if (diff_filespec_is_binary(two))
2502 goto free_and_return;
2503 else {
2504 /* Crazy xdl interfaces.. */
2505 xpparam_t xpp;
2506 xdemitconf_t xecfg;
2507
2508 memset(&xpp, 0, sizeof(xpp));
2509 memset(&xecfg, 0, sizeof(xecfg));
2510 xecfg.ctxlen = 1; /* at least one context line */
2511 xpp.flags = 0;
2512 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2513 &xpp, &xecfg);
2514
2515 if (data.ws_rule & WS_BLANK_AT_EOF) {
2516 struct emit_callback ecbdata;
2517 int blank_at_eof;
2518
2519 ecbdata.ws_rule = data.ws_rule;
2520 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2521 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2522
2523 if (blank_at_eof) {
2524 static char *err;
2525 if (!err)
2526 err = whitespace_error_string(WS_BLANK_AT_EOF);
2527 fprintf(o->file, "%s:%d: %s.\n",
2528 data.filename, blank_at_eof, err);
2529 data.status = 1; /* report errors */
2530 }
2531 }
2532 }
2533 free_and_return:
2534 diff_free_filespec_data(one);
2535 diff_free_filespec_data(two);
2536 if (data.status)
2537 DIFF_OPT_SET(o, CHECK_FAILED);
2538 }
2539
2540 struct diff_filespec *alloc_filespec(const char *path)
2541 {
2542 int namelen = strlen(path);
2543 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2544
2545 memset(spec, 0, sizeof(*spec));
2546 spec->path = (char *)(spec + 1);
2547 memcpy(spec->path, path, namelen+1);
2548 spec->count = 1;
2549 spec->is_binary = -1;
2550 return spec;
2551 }
2552
2553 void free_filespec(struct diff_filespec *spec)
2554 {
2555 if (!--spec->count) {
2556 diff_free_filespec_data(spec);
2557 free(spec);
2558 }
2559 }
2560
2561 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2562 int sha1_valid, unsigned short mode)
2563 {
2564 if (mode) {
2565 spec->mode = canon_mode(mode);
2566 hashcpy(spec->sha1, sha1);
2567 spec->sha1_valid = sha1_valid;
2568 }
2569 }
2570
2571 /*
2572 * Given a name and sha1 pair, if the index tells us the file in
2573 * the work tree has that object contents, return true, so that
2574 * prepare_temp_file() does not have to inflate and extract.
2575 */
2576 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2577 {
2578 const struct cache_entry *ce;
2579 struct stat st;
2580 int pos, len;
2581
2582 /*
2583 * We do not read the cache ourselves here, because the
2584 * benchmark with my previous version that always reads cache
2585 * shows that it makes things worse for diff-tree comparing
2586 * two linux-2.6 kernel trees in an already checked out work
2587 * tree. This is because most diff-tree comparisons deal with
2588 * only a small number of files, while reading the cache is
2589 * expensive for a large project, and its cost outweighs the
2590 * savings we get by not inflating the object to a temporary
2591 * file. Practically, this code only helps when we are used
2592 * by diff-cache --cached, which does read the cache before
2593 * calling us.
2594 */
2595 if (!active_cache)
2596 return 0;
2597
2598 /* We want to avoid the working directory if our caller
2599 * doesn't need the data in a normal file, this system
2600 * is rather slow with its stat/open/mmap/close syscalls,
2601 * and the object is contained in a pack file. The pack
2602 * is probably already open and will be faster to obtain
2603 * the data through than the working directory. Loose
2604 * objects however would tend to be slower as they need
2605 * to be individually opened and inflated.
2606 */
2607 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2608 return 0;
2609
2610 len = strlen(name);
2611 pos = cache_name_pos(name, len);
2612 if (pos < 0)
2613 return 0;
2614 ce = active_cache[pos];
2615
2616 /*
2617 * This is not the sha1 we are looking for, or
2618 * unreusable because it is not a regular file.
2619 */
2620 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2621 return 0;
2622
2623 /*
2624 * If ce is marked as "assume unchanged", there is no
2625 * guarantee that work tree matches what we are looking for.
2626 */
2627 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2628 return 0;
2629
2630 /*
2631 * If ce matches the file in the work tree, we can reuse it.
2632 */
2633 if (ce_uptodate(ce) ||
2634 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2635 return 1;
2636
2637 return 0;
2638 }
2639
2640 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2641 {
2642 int len;
2643 char *data = xmalloc(100), *dirty = "";
2644
2645 /* Are we looking at the work tree? */
2646 if (s->dirty_submodule)
2647 dirty = "-dirty";
2648
2649 len = snprintf(data, 100,
2650 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2651 s->data = data;
2652 s->size = len;
2653 s->should_free = 1;
2654 if (size_only) {
2655 s->data = NULL;
2656 free(data);
2657 }
2658 return 0;
2659 }
2660
2661 /*
2662 * While doing rename detection and pickaxe operation, we may need to
2663 * grab the data for the blob (or file) for our own in-core comparison.
2664 * diff_filespec has data and size fields for this purpose.
2665 */
2666 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2667 {
2668 int err = 0;
2669 /*
2670 * demote FAIL to WARN to allow inspecting the situation
2671 * instead of refusing.
2672 */
2673 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2674 ? SAFE_CRLF_WARN
2675 : safe_crlf);
2676
2677 if (!DIFF_FILE_VALID(s))
2678 die("internal error: asking to populate invalid file.");
2679 if (S_ISDIR(s->mode))
2680 return -1;
2681
2682 if (s->data)
2683 return 0;
2684
2685 if (size_only && 0 < s->size)
2686 return 0;
2687
2688 if (S_ISGITLINK(s->mode))
2689 return diff_populate_gitlink(s, size_only);
2690
2691 if (!s->sha1_valid ||
2692 reuse_worktree_file(s->path, s->sha1, 0)) {
2693 struct strbuf buf = STRBUF_INIT;
2694 struct stat st;
2695 int fd;
2696
2697 if (lstat(s->path, &st) < 0) {
2698 if (errno == ENOENT) {
2699 err_empty:
2700 err = -1;
2701 empty:
2702 s->data = (char *)"";
2703 s->size = 0;
2704 return err;
2705 }
2706 }
2707 s->size = xsize_t(st.st_size);
2708 if (!s->size)
2709 goto empty;
2710 if (S_ISLNK(st.st_mode)) {
2711 struct strbuf sb = STRBUF_INIT;
2712
2713 if (strbuf_readlink(&sb, s->path, s->size))
2714 goto err_empty;
2715 s->size = sb.len;
2716 s->data = strbuf_detach(&sb, NULL);
2717 s->should_free = 1;
2718 return 0;
2719 }
2720 if (size_only)
2721 return 0;
2722 fd = open(s->path, O_RDONLY);
2723 if (fd < 0)
2724 goto err_empty;
2725 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2726 close(fd);
2727 s->should_munmap = 1;
2728
2729 /*
2730 * Convert from working tree format to canonical git format
2731 */
2732 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2733 size_t size = 0;
2734 munmap(s->data, s->size);
2735 s->should_munmap = 0;
2736 s->data = strbuf_detach(&buf, &size);
2737 s->size = size;
2738 s->should_free = 1;
2739 }
2740 }
2741 else {
2742 enum object_type type;
2743 if (size_only) {
2744 type = sha1_object_info(s->sha1, &s->size);
2745 if (type < 0)
2746 die("unable to read %s", sha1_to_hex(s->sha1));
2747 } else {
2748 s->data = read_sha1_file(s->sha1, &type, &s->size);
2749 if (!s->data)
2750 die("unable to read %s", sha1_to_hex(s->sha1));
2751 s->should_free = 1;
2752 }
2753 }
2754 return 0;
2755 }
2756
2757 void diff_free_filespec_blob(struct diff_filespec *s)
2758 {
2759 if (s->should_free)
2760 free(s->data);
2761 else if (s->should_munmap)
2762 munmap(s->data, s->size);
2763
2764 if (s->should_free || s->should_munmap) {
2765 s->should_free = s->should_munmap = 0;
2766 s->data = NULL;
2767 }
2768 }
2769
2770 void diff_free_filespec_data(struct diff_filespec *s)
2771 {
2772 diff_free_filespec_blob(s);
2773 free(s->cnt_data);
2774 s->cnt_data = NULL;
2775 }
2776
2777 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2778 void *blob,
2779 unsigned long size,
2780 const unsigned char *sha1,
2781 int mode)
2782 {
2783 int fd;
2784 struct strbuf buf = STRBUF_INIT;
2785 struct strbuf template = STRBUF_INIT;
2786 char *path_dup = xstrdup(path);
2787 const char *base = basename(path_dup);
2788
2789 /* Generate "XXXXXX_basename.ext" */
2790 strbuf_addstr(&template, "XXXXXX_");
2791 strbuf_addstr(&template, base);
2792
2793 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2794 strlen(base) + 1);
2795 if (fd < 0)
2796 die_errno("unable to create temp-file");
2797 if (convert_to_working_tree(path,
2798 (const char *)blob, (size_t)size, &buf)) {
2799 blob = buf.buf;
2800 size = buf.len;
2801 }
2802 if (write_in_full(fd, blob, size) != size)
2803 die_errno("unable to write temp-file");
2804 close(fd);
2805 temp->name = temp->tmp_path;
2806 strcpy(temp->hex, sha1_to_hex(sha1));
2807 temp->hex[40] = 0;
2808 sprintf(temp->mode, "%06o", mode);
2809 strbuf_release(&buf);
2810 strbuf_release(&template);
2811 free(path_dup);
2812 }
2813
2814 static struct diff_tempfile *prepare_temp_file(const char *name,
2815 struct diff_filespec *one)
2816 {
2817 struct diff_tempfile *temp = claim_diff_tempfile();
2818
2819 if (!DIFF_FILE_VALID(one)) {
2820 not_a_valid_file:
2821 /* A '-' entry produces this for file-2, and
2822 * a '+' entry produces this for file-1.
2823 */
2824 temp->name = "/dev/null";
2825 strcpy(temp->hex, ".");
2826 strcpy(temp->mode, ".");
2827 return temp;
2828 }
2829
2830 if (!remove_tempfile_installed) {
2831 atexit(remove_tempfile);
2832 sigchain_push_common(remove_tempfile_on_signal);
2833 remove_tempfile_installed = 1;
2834 }
2835
2836 if (!S_ISGITLINK(one->mode) &&
2837 (!one->sha1_valid ||
2838 reuse_worktree_file(name, one->sha1, 1))) {
2839 struct stat st;
2840 if (lstat(name, &st) < 0) {
2841 if (errno == ENOENT)
2842 goto not_a_valid_file;
2843 die_errno("stat(%s)", name);
2844 }
2845 if (S_ISLNK(st.st_mode)) {
2846 struct strbuf sb = STRBUF_INIT;
2847 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2848 die_errno("readlink(%s)", name);
2849 prep_temp_blob(name, temp, sb.buf, sb.len,
2850 (one->sha1_valid ?
2851 one->sha1 : null_sha1),
2852 (one->sha1_valid ?
2853 one->mode : S_IFLNK));
2854 strbuf_release(&sb);
2855 }
2856 else {
2857 /* we can borrow from the file in the work tree */
2858 temp->name = name;
2859 if (!one->sha1_valid)
2860 strcpy(temp->hex, sha1_to_hex(null_sha1));
2861 else
2862 strcpy(temp->hex, sha1_to_hex(one->sha1));
2863 /* Even though we may sometimes borrow the
2864 * contents from the work tree, we always want
2865 * one->mode. mode is trustworthy even when
2866 * !(one->sha1_valid), as long as
2867 * DIFF_FILE_VALID(one).
2868 */
2869 sprintf(temp->mode, "%06o", one->mode);
2870 }
2871 return temp;
2872 }
2873 else {
2874 if (diff_populate_filespec(one, 0))
2875 die("cannot read data blob for %s", one->path);
2876 prep_temp_blob(name, temp, one->data, one->size,
2877 one->sha1, one->mode);
2878 }
2879 return temp;
2880 }
2881
2882 /* An external diff command takes:
2883 *
2884 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2885 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2886 *
2887 */
2888 static void run_external_diff(const char *pgm,
2889 const char *name,
2890 const char *other,
2891 struct diff_filespec *one,
2892 struct diff_filespec *two,
2893 const char *xfrm_msg,
2894 int complete_rewrite,
2895 struct diff_options *o)
2896 {
2897 const char *spawn_arg[10];
2898 int retval;
2899 const char **arg = &spawn_arg[0];
2900 struct diff_queue_struct *q = &diff_queued_diff;
2901 const char *env[3] = { NULL };
2902 char env_counter[50];
2903 char env_total[50];
2904
2905 if (one && two) {
2906 struct diff_tempfile *temp_one, *temp_two;
2907 const char *othername = (other ? other : name);
2908 temp_one = prepare_temp_file(name, one);
2909 temp_two = prepare_temp_file(othername, two);
2910 *arg++ = pgm;
2911 *arg++ = name;
2912 *arg++ = temp_one->name;
2913 *arg++ = temp_one->hex;
2914 *arg++ = temp_one->mode;
2915 *arg++ = temp_two->name;
2916 *arg++ = temp_two->hex;
2917 *arg++ = temp_two->mode;
2918 if (other) {
2919 *arg++ = other;
2920 *arg++ = xfrm_msg;
2921 }
2922 } else {
2923 *arg++ = pgm;
2924 *arg++ = name;
2925 }
2926 *arg = NULL;
2927 fflush(NULL);
2928
2929 env[0] = env_counter;
2930 snprintf(env_counter, sizeof(env_counter), "GIT_DIFF_PATH_COUNTER=%d",
2931 ++o->diff_path_counter);
2932 env[1] = env_total;
2933 snprintf(env_total, sizeof(env_total), "GIT_DIFF_PATH_TOTAL=%d", q->nr);
2934
2935 retval = run_command_v_opt_cd_env(spawn_arg, RUN_USING_SHELL, NULL, env);
2936 remove_tempfile();
2937 if (retval) {
2938 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2939 exit(1);
2940 }
2941 }
2942
2943 static int similarity_index(struct diff_filepair *p)
2944 {
2945 return p->score * 100 / MAX_SCORE;
2946 }
2947
2948 static void fill_metainfo(struct strbuf *msg,
2949 const char *name,
2950 const char *other,
2951 struct diff_filespec *one,
2952 struct diff_filespec *two,
2953 struct diff_options *o,
2954 struct diff_filepair *p,
2955 int *must_show_header,
2956 int use_color)
2957 {
2958 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2959 const char *reset = diff_get_color(use_color, DIFF_RESET);
2960 const char *line_prefix = diff_line_prefix(o);
2961
2962 *must_show_header = 1;
2963 strbuf_init(msg, PATH_MAX * 2 + 300);
2964 switch (p->status) {
2965 case DIFF_STATUS_COPIED:
2966 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2967 line_prefix, set, similarity_index(p));
2968 strbuf_addf(msg, "%s\n%s%scopy from ",
2969 reset, line_prefix, set);
2970 quote_c_style(name, msg, NULL, 0);
2971 strbuf_addf(msg, "%s\n%s%scopy to ", 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_RENAMED:
2976 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2977 line_prefix, set, similarity_index(p));
2978 strbuf_addf(msg, "%s\n%s%srename from ",
2979 reset, line_prefix, set);
2980 quote_c_style(name, msg, NULL, 0);
2981 strbuf_addf(msg, "%s\n%s%srename to ",
2982 reset, line_prefix, set);
2983 quote_c_style(other, msg, NULL, 0);
2984 strbuf_addf(msg, "%s\n", reset);
2985 break;
2986 case DIFF_STATUS_MODIFIED:
2987 if (p->score) {
2988 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2989 line_prefix,
2990 set, similarity_index(p), reset);
2991 break;
2992 }
2993 /* fallthru */
2994 default:
2995 *must_show_header = 0;
2996 }
2997 if (one && two && hashcmp(one->sha1, two->sha1)) {
2998 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2999
3000 if (DIFF_OPT_TST(o, BINARY)) {
3001 mmfile_t mf;
3002 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3003 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3004 abbrev = 40;
3005 }
3006 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3007 find_unique_abbrev(one->sha1, abbrev));
3008 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3009 if (one->mode == two->mode)
3010 strbuf_addf(msg, " %06o", one->mode);
3011 strbuf_addf(msg, "%s\n", reset);
3012 }
3013 }
3014
3015 static void run_diff_cmd(const char *pgm,
3016 const char *name,
3017 const char *other,
3018 const char *attr_path,
3019 struct diff_filespec *one,
3020 struct diff_filespec *two,
3021 struct strbuf *msg,
3022 struct diff_options *o,
3023 struct diff_filepair *p)
3024 {
3025 const char *xfrm_msg = NULL;
3026 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3027 int must_show_header = 0;
3028
3029
3030 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3031 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3032 if (drv && drv->external)
3033 pgm = drv->external;
3034 }
3035
3036 if (msg) {
3037 /*
3038 * don't use colors when the header is intended for an
3039 * external diff driver
3040 */
3041 fill_metainfo(msg, name, other, one, two, o, p,
3042 &must_show_header,
3043 want_color(o->use_color) && !pgm);
3044 xfrm_msg = msg->len ? msg->buf : NULL;
3045 }
3046
3047 if (pgm) {
3048 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3049 complete_rewrite, o);
3050 return;
3051 }
3052 if (one && two)
3053 builtin_diff(name, other ? other : name,
3054 one, two, xfrm_msg, must_show_header,
3055 o, complete_rewrite);
3056 else
3057 fprintf(o->file, "* Unmerged path %s\n", name);
3058 }
3059
3060 static void diff_fill_sha1_info(struct diff_filespec *one)
3061 {
3062 if (DIFF_FILE_VALID(one)) {
3063 if (!one->sha1_valid) {
3064 struct stat st;
3065 if (one->is_stdin) {
3066 hashcpy(one->sha1, null_sha1);
3067 return;
3068 }
3069 if (lstat(one->path, &st) < 0)
3070 die_errno("stat '%s'", one->path);
3071 if (index_path(one->sha1, one->path, &st, 0))
3072 die("cannot hash %s", one->path);
3073 }
3074 }
3075 else
3076 hashclr(one->sha1);
3077 }
3078
3079 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3080 {
3081 /* Strip the prefix but do not molest /dev/null and absolute paths */
3082 if (*namep && **namep != '/') {
3083 *namep += prefix_length;
3084 if (**namep == '/')
3085 ++*namep;
3086 }
3087 if (*otherp && **otherp != '/') {
3088 *otherp += prefix_length;
3089 if (**otherp == '/')
3090 ++*otherp;
3091 }
3092 }
3093
3094 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3095 {
3096 const char *pgm = external_diff();
3097 struct strbuf msg;
3098 struct diff_filespec *one = p->one;
3099 struct diff_filespec *two = p->two;
3100 const char *name;
3101 const char *other;
3102 const char *attr_path;
3103
3104 name = p->one->path;
3105 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3106 attr_path = name;
3107 if (o->prefix_length)
3108 strip_prefix(o->prefix_length, &name, &other);
3109
3110 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3111 pgm = NULL;
3112
3113 if (DIFF_PAIR_UNMERGED(p)) {
3114 run_diff_cmd(pgm, name, NULL, attr_path,
3115 NULL, NULL, NULL, o, p);
3116 return;
3117 }
3118
3119 diff_fill_sha1_info(one);
3120 diff_fill_sha1_info(two);
3121
3122 if (!pgm &&
3123 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3124 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3125 /*
3126 * a filepair that changes between file and symlink
3127 * needs to be split into deletion and creation.
3128 */
3129 struct diff_filespec *null = alloc_filespec(two->path);
3130 run_diff_cmd(NULL, name, other, attr_path,
3131 one, null, &msg, o, p);
3132 free(null);
3133 strbuf_release(&msg);
3134
3135 null = alloc_filespec(one->path);
3136 run_diff_cmd(NULL, name, other, attr_path,
3137 null, two, &msg, o, p);
3138 free(null);
3139 }
3140 else
3141 run_diff_cmd(pgm, name, other, attr_path,
3142 one, two, &msg, o, p);
3143
3144 strbuf_release(&msg);
3145 }
3146
3147 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3148 struct diffstat_t *diffstat)
3149 {
3150 const char *name;
3151 const char *other;
3152
3153 if (DIFF_PAIR_UNMERGED(p)) {
3154 /* unmerged */
3155 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3156 return;
3157 }
3158
3159 name = p->one->path;
3160 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3161
3162 if (o->prefix_length)
3163 strip_prefix(o->prefix_length, &name, &other);
3164
3165 diff_fill_sha1_info(p->one);
3166 diff_fill_sha1_info(p->two);
3167
3168 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3169 }
3170
3171 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3172 {
3173 const char *name;
3174 const char *other;
3175 const char *attr_path;
3176
3177 if (DIFF_PAIR_UNMERGED(p)) {
3178 /* unmerged */
3179 return;
3180 }
3181
3182 name = p->one->path;
3183 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3184 attr_path = other ? other : name;
3185
3186 if (o->prefix_length)
3187 strip_prefix(o->prefix_length, &name, &other);
3188
3189 diff_fill_sha1_info(p->one);
3190 diff_fill_sha1_info(p->two);
3191
3192 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3193 }
3194
3195 void diff_setup(struct diff_options *options)
3196 {
3197 memcpy(options, &default_diff_options, sizeof(*options));
3198
3199 options->file = stdout;
3200
3201 options->line_termination = '\n';
3202 options->break_opt = -1;
3203 options->rename_limit = -1;
3204 options->dirstat_permille = diff_dirstat_permille_default;
3205 options->context = diff_context_default;
3206 DIFF_OPT_SET(options, RENAME_EMPTY);
3207
3208 options->change = diff_change;
3209 options->add_remove = diff_addremove;
3210 options->use_color = diff_use_color_default;
3211 options->detect_rename = diff_detect_rename_default;
3212 options->xdl_opts |= diff_algorithm;
3213
3214 options->orderfile = diff_order_file_cfg;
3215
3216 if (diff_no_prefix) {
3217 options->a_prefix = options->b_prefix = "";
3218 } else if (!diff_mnemonic_prefix) {
3219 options->a_prefix = "a/";
3220 options->b_prefix = "b/";
3221 }
3222 }
3223
3224 void diff_setup_done(struct diff_options *options)
3225 {
3226 int count = 0;
3227
3228 if (options->set_default)
3229 options->set_default(options);
3230
3231 if (options->output_format & DIFF_FORMAT_NAME)
3232 count++;
3233 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3234 count++;
3235 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3236 count++;
3237 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3238 count++;
3239 if (count > 1)
3240 die("--name-only, --name-status, --check and -s are mutually exclusive");
3241
3242 /*
3243 * Most of the time we can say "there are changes"
3244 * only by checking if there are changed paths, but
3245 * --ignore-whitespace* options force us to look
3246 * inside contents.
3247 */
3248
3249 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3250 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3251 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3252 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3253 else
3254 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3255
3256 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3257 options->detect_rename = DIFF_DETECT_COPY;
3258
3259 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3260 options->prefix = NULL;
3261 if (options->prefix)
3262 options->prefix_length = strlen(options->prefix);
3263 else
3264 options->prefix_length = 0;
3265
3266 if (options->output_format & (DIFF_FORMAT_NAME |
3267 DIFF_FORMAT_NAME_STATUS |
3268 DIFF_FORMAT_CHECKDIFF |
3269 DIFF_FORMAT_NO_OUTPUT))
3270 options->output_format &= ~(DIFF_FORMAT_RAW |
3271 DIFF_FORMAT_NUMSTAT |
3272 DIFF_FORMAT_DIFFSTAT |
3273 DIFF_FORMAT_SHORTSTAT |
3274 DIFF_FORMAT_DIRSTAT |
3275 DIFF_FORMAT_SUMMARY |
3276 DIFF_FORMAT_PATCH);
3277
3278 /*
3279 * These cases always need recursive; we do not drop caller-supplied
3280 * recursive bits for other formats here.
3281 */
3282 if (options->output_format & (DIFF_FORMAT_PATCH |
3283 DIFF_FORMAT_NUMSTAT |
3284 DIFF_FORMAT_DIFFSTAT |
3285 DIFF_FORMAT_SHORTSTAT |
3286 DIFF_FORMAT_DIRSTAT |
3287 DIFF_FORMAT_SUMMARY |
3288 DIFF_FORMAT_CHECKDIFF))
3289 DIFF_OPT_SET(options, RECURSIVE);
3290 /*
3291 * Also pickaxe would not work very well if you do not say recursive
3292 */
3293 if (options->pickaxe)
3294 DIFF_OPT_SET(options, RECURSIVE);
3295 /*
3296 * When patches are generated, submodules diffed against the work tree
3297 * must be checked for dirtiness too so it can be shown in the output
3298 */
3299 if (options->output_format & DIFF_FORMAT_PATCH)
3300 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3301
3302 if (options->detect_rename && options->rename_limit < 0)
3303 options->rename_limit = diff_rename_limit_default;
3304 if (options->setup & DIFF_SETUP_USE_CACHE) {
3305 if (!active_cache)
3306 /* read-cache does not die even when it fails
3307 * so it is safe for us to do this here. Also
3308 * it does not smudge active_cache or active_nr
3309 * when it fails, so we do not have to worry about
3310 * cleaning it up ourselves either.
3311 */
3312 read_cache();
3313 }
3314 if (options->abbrev <= 0 || 40 < options->abbrev)
3315 options->abbrev = 40; /* full */
3316
3317 /*
3318 * It does not make sense to show the first hit we happened
3319 * to have found. It does not make sense not to return with
3320 * exit code in such a case either.
3321 */
3322 if (DIFF_OPT_TST(options, QUICK)) {
3323 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3324 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3325 }
3326
3327 options->diff_path_counter = 0;
3328 }
3329
3330 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3331 {
3332 char c, *eq;
3333 int len;
3334
3335 if (*arg != '-')
3336 return 0;
3337 c = *++arg;
3338 if (!c)
3339 return 0;
3340 if (c == arg_short) {
3341 c = *++arg;
3342 if (!c)
3343 return 1;
3344 if (val && isdigit(c)) {
3345 char *end;
3346 int n = strtoul(arg, &end, 10);
3347 if (*end)
3348 return 0;
3349 *val = n;
3350 return 1;
3351 }
3352 return 0;
3353 }
3354 if (c != '-')
3355 return 0;
3356 arg++;
3357 eq = strchrnul(arg, '=');
3358 len = eq - arg;
3359 if (!len || strncmp(arg, arg_long, len))
3360 return 0;
3361 if (*eq) {
3362 int n;
3363 char *end;
3364 if (!isdigit(*++eq))
3365 return 0;
3366 n = strtoul(eq, &end, 10);
3367 if (*end)
3368 return 0;
3369 *val = n;
3370 }
3371 return 1;
3372 }
3373
3374 static int diff_scoreopt_parse(const char *opt);
3375
3376 static inline int short_opt(char opt, const char **argv,
3377 const char **optarg)
3378 {
3379 const char *arg = argv[0];
3380 if (arg[0] != '-' || arg[1] != opt)
3381 return 0;
3382 if (arg[2] != '\0') {
3383 *optarg = arg + 2;
3384 return 1;
3385 }
3386 if (!argv[1])
3387 die("Option '%c' requires a value", opt);
3388 *optarg = argv[1];
3389 return 2;
3390 }
3391
3392 int parse_long_opt(const char *opt, const char **argv,
3393 const char **optarg)
3394 {
3395 const char *arg = argv[0];
3396 if (arg[0] != '-' || arg[1] != '-')
3397 return 0;
3398 arg += strlen("--");
3399 if (!starts_with(arg, opt))
3400 return 0;
3401 arg += strlen(opt);
3402 if (*arg == '=') { /* stuck form: --option=value */
3403 *optarg = arg + 1;
3404 return 1;
3405 }
3406 if (*arg != '\0')
3407 return 0;
3408 /* separate form: --option value */
3409 if (!argv[1])
3410 die("Option '--%s' requires a value", opt);
3411 *optarg = argv[1];
3412 return 2;
3413 }
3414
3415 static int stat_opt(struct diff_options *options, const char **av)
3416 {
3417 const char *arg = av[0];
3418 char *end;
3419 int width = options->stat_width;
3420 int name_width = options->stat_name_width;
3421 int graph_width = options->stat_graph_width;
3422 int count = options->stat_count;
3423 int argcount = 1;
3424
3425 arg += strlen("--stat");
3426 end = (char *)arg;
3427
3428 switch (*arg) {
3429 case '-':
3430 if (starts_with(arg, "-width")) {
3431 arg += strlen("-width");
3432 if (*arg == '=')
3433 width = strtoul(arg + 1, &end, 10);
3434 else if (!*arg && !av[1])
3435 die("Option '--stat-width' requires a value");
3436 else if (!*arg) {
3437 width = strtoul(av[1], &end, 10);
3438 argcount = 2;
3439 }
3440 } else if (starts_with(arg, "-name-width")) {
3441 arg += strlen("-name-width");
3442 if (*arg == '=')
3443 name_width = strtoul(arg + 1, &end, 10);
3444 else if (!*arg && !av[1])
3445 die("Option '--stat-name-width' requires a value");
3446 else if (!*arg) {
3447 name_width = strtoul(av[1], &end, 10);
3448 argcount = 2;
3449 }
3450 } else if (starts_with(arg, "-graph-width")) {
3451 arg += strlen("-graph-width");
3452 if (*arg == '=')
3453 graph_width = strtoul(arg + 1, &end, 10);
3454 else if (!*arg && !av[1])
3455 die("Option '--stat-graph-width' requires a value");
3456 else if (!*arg) {
3457 graph_width = strtoul(av[1], &end, 10);
3458 argcount = 2;
3459 }
3460 } else if (starts_with(arg, "-count")) {
3461 arg += strlen("-count");
3462 if (*arg == '=')
3463 count = strtoul(arg + 1, &end, 10);
3464 else if (!*arg && !av[1])
3465 die("Option '--stat-count' requires a value");
3466 else if (!*arg) {
3467 count = strtoul(av[1], &end, 10);
3468 argcount = 2;
3469 }
3470 }
3471 break;
3472 case '=':
3473 width = strtoul(arg+1, &end, 10);
3474 if (*end == ',')
3475 name_width = strtoul(end+1, &end, 10);
3476 if (*end == ',')
3477 count = strtoul(end+1, &end, 10);
3478 }
3479
3480 /* Important! This checks all the error cases! */
3481 if (*end)
3482 return 0;
3483 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3484 options->stat_name_width = name_width;
3485 options->stat_graph_width = graph_width;
3486 options->stat_width = width;
3487 options->stat_count = count;
3488 return argcount;
3489 }
3490
3491 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3492 {
3493 struct strbuf errmsg = STRBUF_INIT;
3494 if (parse_dirstat_params(options, params, &errmsg))
3495 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3496 errmsg.buf);
3497 strbuf_release(&errmsg);
3498 /*
3499 * The caller knows a dirstat-related option is given from the command
3500 * line; allow it to say "return this_function();"
3501 */
3502 options->output_format |= DIFF_FORMAT_DIRSTAT;
3503 return 1;
3504 }
3505
3506 static int parse_submodule_opt(struct diff_options *options, const char *value)
3507 {
3508 if (parse_submodule_params(options, value))
3509 die(_("Failed to parse --submodule option parameter: '%s'"),
3510 value);
3511 return 1;
3512 }
3513
3514 static const char diff_status_letters[] = {
3515 DIFF_STATUS_ADDED,
3516 DIFF_STATUS_COPIED,
3517 DIFF_STATUS_DELETED,
3518 DIFF_STATUS_MODIFIED,
3519 DIFF_STATUS_RENAMED,
3520 DIFF_STATUS_TYPE_CHANGED,
3521 DIFF_STATUS_UNKNOWN,
3522 DIFF_STATUS_UNMERGED,
3523 DIFF_STATUS_FILTER_AON,
3524 DIFF_STATUS_FILTER_BROKEN,
3525 '\0',
3526 };
3527
3528 static unsigned int filter_bit['Z' + 1];
3529
3530 static void prepare_filter_bits(void)
3531 {
3532 int i;
3533
3534 if (!filter_bit[DIFF_STATUS_ADDED]) {
3535 for (i = 0; diff_status_letters[i]; i++)
3536 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3537 }
3538 }
3539
3540 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3541 {
3542 return opt->filter & filter_bit[(int) status];
3543 }
3544
3545 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3546 {
3547 int i, optch;
3548
3549 prepare_filter_bits();
3550
3551 /*
3552 * If there is a negation e.g. 'd' in the input, and we haven't
3553 * initialized the filter field with another --diff-filter, start
3554 * from full set of bits, except for AON.
3555 */
3556 if (!opt->filter) {
3557 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3558 if (optch < 'a' || 'z' < optch)
3559 continue;
3560 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3561 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3562 break;
3563 }
3564 }
3565
3566 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3567 unsigned int bit;
3568 int negate;
3569
3570 if ('a' <= optch && optch <= 'z') {
3571 negate = 1;
3572 optch = toupper(optch);
3573 } else {
3574 negate = 0;
3575 }
3576
3577 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3578 if (!bit)
3579 return optarg[i];
3580 if (negate)
3581 opt->filter &= ~bit;
3582 else
3583 opt->filter |= bit;
3584 }
3585 return 0;
3586 }
3587
3588 static void enable_patch_output(int *fmt) {
3589 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3590 *fmt |= DIFF_FORMAT_PATCH;
3591 }
3592
3593 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3594 {
3595 const char *arg = av[0];
3596 const char *optarg;
3597 int argcount;
3598
3599 /* Output format options */
3600 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3601 || opt_arg(arg, 'U', "unified", &options->context))
3602 enable_patch_output(&options->output_format);
3603 else if (!strcmp(arg, "--raw"))
3604 options->output_format |= DIFF_FORMAT_RAW;
3605 else if (!strcmp(arg, "--patch-with-raw")) {
3606 enable_patch_output(&options->output_format);
3607 options->output_format |= DIFF_FORMAT_RAW;
3608 } else if (!strcmp(arg, "--numstat"))
3609 options->output_format |= DIFF_FORMAT_NUMSTAT;
3610 else if (!strcmp(arg, "--shortstat"))
3611 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3612 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3613 return parse_dirstat_opt(options, "");
3614 else if (starts_with(arg, "-X"))
3615 return parse_dirstat_opt(options, arg + 2);
3616 else if (starts_with(arg, "--dirstat="))
3617 return parse_dirstat_opt(options, arg + 10);
3618 else if (!strcmp(arg, "--cumulative"))
3619 return parse_dirstat_opt(options, "cumulative");
3620 else if (!strcmp(arg, "--dirstat-by-file"))
3621 return parse_dirstat_opt(options, "files");
3622 else if (starts_with(arg, "--dirstat-by-file=")) {
3623 parse_dirstat_opt(options, "files");
3624 return parse_dirstat_opt(options, arg + 18);
3625 }
3626 else if (!strcmp(arg, "--check"))
3627 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3628 else if (!strcmp(arg, "--summary"))
3629 options->output_format |= DIFF_FORMAT_SUMMARY;
3630 else if (!strcmp(arg, "--patch-with-stat")) {
3631 enable_patch_output(&options->output_format);
3632 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3633 } else if (!strcmp(arg, "--name-only"))
3634 options->output_format |= DIFF_FORMAT_NAME;
3635 else if (!strcmp(arg, "--name-status"))
3636 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3637 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3638 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3639 else if (starts_with(arg, "--stat"))
3640 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3641 return stat_opt(options, av);
3642
3643 /* renames options */
3644 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3645 !strcmp(arg, "--break-rewrites")) {
3646 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3647 return error("invalid argument to -B: %s", arg+2);
3648 }
3649 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3650 !strcmp(arg, "--find-renames")) {
3651 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3652 return error("invalid argument to -M: %s", arg+2);
3653 options->detect_rename = DIFF_DETECT_RENAME;
3654 }
3655 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3656 options->irreversible_delete = 1;
3657 }
3658 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3659 !strcmp(arg, "--find-copies")) {
3660 if (options->detect_rename == DIFF_DETECT_COPY)
3661 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3662 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3663 return error("invalid argument to -C: %s", arg+2);
3664 options->detect_rename = DIFF_DETECT_COPY;
3665 }
3666 else if (!strcmp(arg, "--no-renames"))
3667 options->detect_rename = 0;
3668 else if (!strcmp(arg, "--rename-empty"))
3669 DIFF_OPT_SET(options, RENAME_EMPTY);
3670 else if (!strcmp(arg, "--no-rename-empty"))
3671 DIFF_OPT_CLR(options, RENAME_EMPTY);
3672 else if (!strcmp(arg, "--relative"))
3673 DIFF_OPT_SET(options, RELATIVE_NAME);
3674 else if (starts_with(arg, "--relative=")) {
3675 DIFF_OPT_SET(options, RELATIVE_NAME);
3676 options->prefix = arg + 11;
3677 }
3678
3679 /* xdiff options */
3680 else if (!strcmp(arg, "--minimal"))
3681 DIFF_XDL_SET(options, NEED_MINIMAL);
3682 else if (!strcmp(arg, "--no-minimal"))
3683 DIFF_XDL_CLR(options, NEED_MINIMAL);
3684 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3685 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3686 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3687 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3688 else if (!strcmp(arg, "--ignore-space-at-eol"))
3689 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3690 else if (!strcmp(arg, "--ignore-blank-lines"))
3691 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3692 else if (!strcmp(arg, "--patience"))
3693 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3694 else if (!strcmp(arg, "--histogram"))
3695 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3696 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3697 long value = parse_algorithm_value(optarg);
3698 if (value < 0)
3699 return error("option diff-algorithm accepts \"myers\", "
3700 "\"minimal\", \"patience\" and \"histogram\"");
3701 /* clear out previous settings */
3702 DIFF_XDL_CLR(options, NEED_MINIMAL);
3703 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3704 options->xdl_opts |= value;
3705 return argcount;
3706 }
3707
3708 /* flags options */
3709 else if (!strcmp(arg, "--binary")) {
3710 enable_patch_output(&options->output_format);
3711 DIFF_OPT_SET(options, BINARY);
3712 }
3713 else if (!strcmp(arg, "--full-index"))
3714 DIFF_OPT_SET(options, FULL_INDEX);
3715 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3716 DIFF_OPT_SET(options, TEXT);
3717 else if (!strcmp(arg, "-R"))
3718 DIFF_OPT_SET(options, REVERSE_DIFF);
3719 else if (!strcmp(arg, "--find-copies-harder"))
3720 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3721 else if (!strcmp(arg, "--follow"))
3722 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3723 else if (!strcmp(arg, "--no-follow"))
3724 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3725 else if (!strcmp(arg, "--color"))
3726 options->use_color = 1;
3727 else if (starts_with(arg, "--color=")) {
3728 int value = git_config_colorbool(NULL, arg+8);
3729 if (value < 0)
3730 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3731 options->use_color = value;
3732 }
3733 else if (!strcmp(arg, "--no-color"))
3734 options->use_color = 0;
3735 else if (!strcmp(arg, "--color-words")) {
3736 options->use_color = 1;
3737 options->word_diff = DIFF_WORDS_COLOR;
3738 }
3739 else if (starts_with(arg, "--color-words=")) {
3740 options->use_color = 1;
3741 options->word_diff = DIFF_WORDS_COLOR;
3742 options->word_regex = arg + 14;
3743 }
3744 else if (!strcmp(arg, "--word-diff")) {
3745 if (options->word_diff == DIFF_WORDS_NONE)
3746 options->word_diff = DIFF_WORDS_PLAIN;
3747 }
3748 else if (starts_with(arg, "--word-diff=")) {
3749 const char *type = arg + 12;
3750 if (!strcmp(type, "plain"))
3751 options->word_diff = DIFF_WORDS_PLAIN;
3752 else if (!strcmp(type, "color")) {
3753 options->use_color = 1;
3754 options->word_diff = DIFF_WORDS_COLOR;
3755 }
3756 else if (!strcmp(type, "porcelain"))
3757 options->word_diff = DIFF_WORDS_PORCELAIN;
3758 else if (!strcmp(type, "none"))
3759 options->word_diff = DIFF_WORDS_NONE;
3760 else
3761 die("bad --word-diff argument: %s", type);
3762 }
3763 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3764 if (options->word_diff == DIFF_WORDS_NONE)
3765 options->word_diff = DIFF_WORDS_PLAIN;
3766 options->word_regex = optarg;
3767 return argcount;
3768 }
3769 else if (!strcmp(arg, "--exit-code"))
3770 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3771 else if (!strcmp(arg, "--quiet"))
3772 DIFF_OPT_SET(options, QUICK);
3773 else if (!strcmp(arg, "--ext-diff"))
3774 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3775 else if (!strcmp(arg, "--no-ext-diff"))
3776 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3777 else if (!strcmp(arg, "--textconv"))
3778 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3779 else if (!strcmp(arg, "--no-textconv"))
3780 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3781 else if (!strcmp(arg, "--ignore-submodules")) {
3782 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3783 handle_ignore_submodules_arg(options, "all");
3784 } else if (starts_with(arg, "--ignore-submodules=")) {
3785 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3786 handle_ignore_submodules_arg(options, arg + 20);
3787 } else if (!strcmp(arg, "--submodule"))
3788 DIFF_OPT_SET(options, SUBMODULE_LOG);
3789 else if (starts_with(arg, "--submodule="))
3790 return parse_submodule_opt(options, arg + 12);
3791
3792 /* misc options */
3793 else if (!strcmp(arg, "-z"))
3794 options->line_termination = 0;
3795 else if ((argcount = short_opt('l', av, &optarg))) {
3796 options->rename_limit = strtoul(optarg, NULL, 10);
3797 return argcount;
3798 }
3799 else if ((argcount = short_opt('S', av, &optarg))) {
3800 options->pickaxe = optarg;
3801 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3802 return argcount;
3803 } else if ((argcount = short_opt('G', av, &optarg))) {
3804 options->pickaxe = optarg;
3805 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3806 return argcount;
3807 }
3808 else if (!strcmp(arg, "--pickaxe-all"))
3809 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3810 else if (!strcmp(arg, "--pickaxe-regex"))
3811 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3812 else if ((argcount = short_opt('O', av, &optarg))) {
3813 options->orderfile = optarg;
3814 return argcount;
3815 }
3816 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3817 int offending = parse_diff_filter_opt(optarg, options);
3818 if (offending)
3819 die("unknown change class '%c' in --diff-filter=%s",
3820 offending, optarg);
3821 return argcount;
3822 }
3823 else if (!strcmp(arg, "--abbrev"))
3824 options->abbrev = DEFAULT_ABBREV;
3825 else if (starts_with(arg, "--abbrev=")) {
3826 options->abbrev = strtoul(arg + 9, NULL, 10);
3827 if (options->abbrev < MINIMUM_ABBREV)
3828 options->abbrev = MINIMUM_ABBREV;
3829 else if (40 < options->abbrev)
3830 options->abbrev = 40;
3831 }
3832 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3833 options->a_prefix = optarg;
3834 return argcount;
3835 }
3836 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3837 options->b_prefix = optarg;
3838 return argcount;
3839 }
3840 else if (!strcmp(arg, "--no-prefix"))
3841 options->a_prefix = options->b_prefix = "";
3842 else if (opt_arg(arg, '\0', "inter-hunk-context",
3843 &options->interhunkcontext))
3844 ;
3845 else if (!strcmp(arg, "-W"))
3846 DIFF_OPT_SET(options, FUNCCONTEXT);
3847 else if (!strcmp(arg, "--function-context"))
3848 DIFF_OPT_SET(options, FUNCCONTEXT);
3849 else if (!strcmp(arg, "--no-function-context"))
3850 DIFF_OPT_CLR(options, FUNCCONTEXT);
3851 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3852 options->file = fopen(optarg, "w");
3853 if (!options->file)
3854 die_errno("Could not open '%s'", optarg);
3855 options->close_file = 1;
3856 return argcount;
3857 } else
3858 return 0;
3859 return 1;
3860 }
3861
3862 int parse_rename_score(const char **cp_p)
3863 {
3864 unsigned long num, scale;
3865 int ch, dot;
3866 const char *cp = *cp_p;
3867
3868 num = 0;
3869 scale = 1;
3870 dot = 0;
3871 for (;;) {
3872 ch = *cp;
3873 if ( !dot && ch == '.' ) {
3874 scale = 1;
3875 dot = 1;
3876 } else if ( ch == '%' ) {
3877 scale = dot ? scale*100 : 100;
3878 cp++; /* % is always at the end */
3879 break;
3880 } else if ( ch >= '0' && ch <= '9' ) {
3881 if ( scale < 100000 ) {
3882 scale *= 10;
3883 num = (num*10) + (ch-'0');
3884 }
3885 } else {
3886 break;
3887 }
3888 cp++;
3889 }
3890 *cp_p = cp;
3891
3892 /* user says num divided by scale and we say internally that
3893 * is MAX_SCORE * num / scale.
3894 */
3895 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3896 }
3897
3898 static int diff_scoreopt_parse(const char *opt)
3899 {
3900 int opt1, opt2, cmd;
3901
3902 if (*opt++ != '-')
3903 return -1;
3904 cmd = *opt++;
3905 if (cmd == '-') {
3906 /* convert the long-form arguments into short-form versions */
3907 if (starts_with(opt, "break-rewrites")) {
3908 opt += strlen("break-rewrites");
3909 if (*opt == 0 || *opt++ == '=')
3910 cmd = 'B';
3911 } else if (starts_with(opt, "find-copies")) {
3912 opt += strlen("find-copies");
3913 if (*opt == 0 || *opt++ == '=')
3914 cmd = 'C';
3915 } else if (starts_with(opt, "find-renames")) {
3916 opt += strlen("find-renames");
3917 if (*opt == 0 || *opt++ == '=')
3918 cmd = 'M';
3919 }
3920 }
3921 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3922 return -1; /* that is not a -M, -C, or -B option */
3923
3924 opt1 = parse_rename_score(&opt);
3925 if (cmd != 'B')
3926 opt2 = 0;
3927 else {
3928 if (*opt == 0)
3929 opt2 = 0;
3930 else if (*opt != '/')
3931 return -1; /* we expect -B80/99 or -B80 */
3932 else {
3933 opt++;
3934 opt2 = parse_rename_score(&opt);
3935 }
3936 }
3937 if (*opt != 0)
3938 return -1;
3939 return opt1 | (opt2 << 16);
3940 }
3941
3942 struct diff_queue_struct diff_queued_diff;
3943
3944 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3945 {
3946 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
3947 queue->queue[queue->nr++] = dp;
3948 }
3949
3950 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3951 struct diff_filespec *one,
3952 struct diff_filespec *two)
3953 {
3954 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3955 dp->one = one;
3956 dp->two = two;
3957 if (queue)
3958 diff_q(queue, dp);
3959 return dp;
3960 }
3961
3962 void diff_free_filepair(struct diff_filepair *p)
3963 {
3964 free_filespec(p->one);
3965 free_filespec(p->two);
3966 free(p);
3967 }
3968
3969 /* This is different from find_unique_abbrev() in that
3970 * it stuffs the result with dots for alignment.
3971 */
3972 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3973 {
3974 int abblen;
3975 const char *abbrev;
3976 if (len == 40)
3977 return sha1_to_hex(sha1);
3978
3979 abbrev = find_unique_abbrev(sha1, len);
3980 abblen = strlen(abbrev);
3981 if (abblen < 37) {
3982 static char hex[41];
3983 if (len < abblen && abblen <= len + 2)
3984 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3985 else
3986 sprintf(hex, "%s...", abbrev);
3987 return hex;
3988 }
3989 return sha1_to_hex(sha1);
3990 }
3991
3992 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3993 {
3994 int line_termination = opt->line_termination;
3995 int inter_name_termination = line_termination ? '\t' : '\0';
3996
3997 fprintf(opt->file, "%s", diff_line_prefix(opt));
3998 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3999 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4000 diff_unique_abbrev(p->one->sha1, opt->abbrev));
4001 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
4002 }
4003 if (p->score) {
4004 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4005 inter_name_termination);
4006 } else {
4007 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4008 }
4009
4010 if (p->status == DIFF_STATUS_COPIED ||
4011 p->status == DIFF_STATUS_RENAMED) {
4012 const char *name_a, *name_b;
4013 name_a = p->one->path;
4014 name_b = p->two->path;
4015 strip_prefix(opt->prefix_length, &name_a, &name_b);
4016 write_name_quoted(name_a, opt->file, inter_name_termination);
4017 write_name_quoted(name_b, opt->file, line_termination);
4018 } else {
4019 const char *name_a, *name_b;
4020 name_a = p->one->mode ? p->one->path : p->two->path;
4021 name_b = NULL;
4022 strip_prefix(opt->prefix_length, &name_a, &name_b);
4023 write_name_quoted(name_a, opt->file, line_termination);
4024 }
4025 }
4026
4027 int diff_unmodified_pair(struct diff_filepair *p)
4028 {
4029 /* This function is written stricter than necessary to support
4030 * the currently implemented transformers, but the idea is to
4031 * let transformers to produce diff_filepairs any way they want,
4032 * and filter and clean them up here before producing the output.
4033 */
4034 struct diff_filespec *one = p->one, *two = p->two;
4035
4036 if (DIFF_PAIR_UNMERGED(p))
4037 return 0; /* unmerged is interesting */
4038
4039 /* deletion, addition, mode or type change
4040 * and rename are all interesting.
4041 */
4042 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4043 DIFF_PAIR_MODE_CHANGED(p) ||
4044 strcmp(one->path, two->path))
4045 return 0;
4046
4047 /* both are valid and point at the same path. that is, we are
4048 * dealing with a change.
4049 */
4050 if (one->sha1_valid && two->sha1_valid &&
4051 !hashcmp(one->sha1, two->sha1) &&
4052 !one->dirty_submodule && !two->dirty_submodule)
4053 return 1; /* no change */
4054 if (!one->sha1_valid && !two->sha1_valid)
4055 return 1; /* both look at the same file on the filesystem. */
4056 return 0;
4057 }
4058
4059 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4060 {
4061 if (diff_unmodified_pair(p))
4062 return;
4063
4064 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4065 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4066 return; /* no tree diffs in patch format */
4067
4068 run_diff(p, o);
4069 }
4070
4071 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4072 struct diffstat_t *diffstat)
4073 {
4074 if (diff_unmodified_pair(p))
4075 return;
4076
4077 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4078 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4079 return; /* no useful stat for tree diffs */
4080
4081 run_diffstat(p, o, diffstat);
4082 }
4083
4084 static void diff_flush_checkdiff(struct diff_filepair *p,
4085 struct diff_options *o)
4086 {
4087 if (diff_unmodified_pair(p))
4088 return;
4089
4090 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4091 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4092 return; /* nothing to check in tree diffs */
4093
4094 run_checkdiff(p, o);
4095 }
4096
4097 int diff_queue_is_empty(void)
4098 {
4099 struct diff_queue_struct *q = &diff_queued_diff;
4100 int i;
4101 for (i = 0; i < q->nr; i++)
4102 if (!diff_unmodified_pair(q->queue[i]))
4103 return 0;
4104 return 1;
4105 }
4106
4107 #if DIFF_DEBUG
4108 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4109 {
4110 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4111 x, one ? one : "",
4112 s->path,
4113 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4114 s->mode,
4115 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4116 fprintf(stderr, "queue[%d] %s size %lu\n",
4117 x, one ? one : "",
4118 s->size);
4119 }
4120
4121 void diff_debug_filepair(const struct diff_filepair *p, int i)
4122 {
4123 diff_debug_filespec(p->one, i, "one");
4124 diff_debug_filespec(p->two, i, "two");
4125 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4126 p->score, p->status ? p->status : '?',
4127 p->one->rename_used, p->broken_pair);
4128 }
4129
4130 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4131 {
4132 int i;
4133 if (msg)
4134 fprintf(stderr, "%s\n", msg);
4135 fprintf(stderr, "q->nr = %d\n", q->nr);
4136 for (i = 0; i < q->nr; i++) {
4137 struct diff_filepair *p = q->queue[i];
4138 diff_debug_filepair(p, i);
4139 }
4140 }
4141 #endif
4142
4143 static void diff_resolve_rename_copy(void)
4144 {
4145 int i;
4146 struct diff_filepair *p;
4147 struct diff_queue_struct *q = &diff_queued_diff;
4148
4149 diff_debug_queue("resolve-rename-copy", q);
4150
4151 for (i = 0; i < q->nr; i++) {
4152 p = q->queue[i];
4153 p->status = 0; /* undecided */
4154 if (DIFF_PAIR_UNMERGED(p))
4155 p->status = DIFF_STATUS_UNMERGED;
4156 else if (!DIFF_FILE_VALID(p->one))
4157 p->status = DIFF_STATUS_ADDED;
4158 else if (!DIFF_FILE_VALID(p->two))
4159 p->status = DIFF_STATUS_DELETED;
4160 else if (DIFF_PAIR_TYPE_CHANGED(p))
4161 p->status = DIFF_STATUS_TYPE_CHANGED;
4162
4163 /* from this point on, we are dealing with a pair
4164 * whose both sides are valid and of the same type, i.e.
4165 * either in-place edit or rename/copy edit.
4166 */
4167 else if (DIFF_PAIR_RENAME(p)) {
4168 /*
4169 * A rename might have re-connected a broken
4170 * pair up, causing the pathnames to be the
4171 * same again. If so, that's not a rename at
4172 * all, just a modification..
4173 *
4174 * Otherwise, see if this source was used for
4175 * multiple renames, in which case we decrement
4176 * the count, and call it a copy.
4177 */
4178 if (!strcmp(p->one->path, p->two->path))
4179 p->status = DIFF_STATUS_MODIFIED;
4180 else if (--p->one->rename_used > 0)
4181 p->status = DIFF_STATUS_COPIED;
4182 else
4183 p->status = DIFF_STATUS_RENAMED;
4184 }
4185 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4186 p->one->mode != p->two->mode ||
4187 p->one->dirty_submodule ||
4188 p->two->dirty_submodule ||
4189 is_null_sha1(p->one->sha1))
4190 p->status = DIFF_STATUS_MODIFIED;
4191 else {
4192 /* This is a "no-change" entry and should not
4193 * happen anymore, but prepare for broken callers.
4194 */
4195 error("feeding unmodified %s to diffcore",
4196 p->one->path);
4197 p->status = DIFF_STATUS_UNKNOWN;
4198 }
4199 }
4200 diff_debug_queue("resolve-rename-copy done", q);
4201 }
4202
4203 static int check_pair_status(struct diff_filepair *p)
4204 {
4205 switch (p->status) {
4206 case DIFF_STATUS_UNKNOWN:
4207 return 0;
4208 case 0:
4209 die("internal error in diff-resolve-rename-copy");
4210 default:
4211 return 1;
4212 }
4213 }
4214
4215 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4216 {
4217 int fmt = opt->output_format;
4218
4219 if (fmt & DIFF_FORMAT_CHECKDIFF)
4220 diff_flush_checkdiff(p, opt);
4221 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4222 diff_flush_raw(p, opt);
4223 else if (fmt & DIFF_FORMAT_NAME) {
4224 const char *name_a, *name_b;
4225 name_a = p->two->path;
4226 name_b = NULL;
4227 strip_prefix(opt->prefix_length, &name_a, &name_b);
4228 write_name_quoted(name_a, opt->file, opt->line_termination);
4229 }
4230 }
4231
4232 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4233 {
4234 if (fs->mode)
4235 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4236 else
4237 fprintf(file, " %s ", newdelete);
4238 write_name_quoted(fs->path, file, '\n');
4239 }
4240
4241
4242 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4243 const char *line_prefix)
4244 {
4245 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4246 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4247 p->two->mode, show_name ? ' ' : '\n');
4248 if (show_name) {
4249 write_name_quoted(p->two->path, file, '\n');
4250 }
4251 }
4252 }
4253
4254 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4255 const char *line_prefix)
4256 {
4257 char *names = pprint_rename(p->one->path, p->two->path);
4258
4259 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4260 free(names);
4261 show_mode_change(file, p, 0, line_prefix);
4262 }
4263
4264 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4265 {
4266 FILE *file = opt->file;
4267 const char *line_prefix = diff_line_prefix(opt);
4268
4269 switch(p->status) {
4270 case DIFF_STATUS_DELETED:
4271 fputs(line_prefix, file);
4272 show_file_mode_name(file, "delete", p->one);
4273 break;
4274 case DIFF_STATUS_ADDED:
4275 fputs(line_prefix, file);
4276 show_file_mode_name(file, "create", p->two);
4277 break;
4278 case DIFF_STATUS_COPIED:
4279 fputs(line_prefix, file);
4280 show_rename_copy(file, "copy", p, line_prefix);
4281 break;
4282 case DIFF_STATUS_RENAMED:
4283 fputs(line_prefix, file);
4284 show_rename_copy(file, "rename", p, line_prefix);
4285 break;
4286 default:
4287 if (p->score) {
4288 fprintf(file, "%s rewrite ", line_prefix);
4289 write_name_quoted(p->two->path, file, ' ');
4290 fprintf(file, "(%d%%)\n", similarity_index(p));
4291 }
4292 show_mode_change(file, p, !p->score, line_prefix);
4293 break;
4294 }
4295 }
4296
4297 struct patch_id_t {
4298 git_SHA_CTX *ctx;
4299 int patchlen;
4300 };
4301
4302 static int remove_space(char *line, int len)
4303 {
4304 int i;
4305 char *dst = line;
4306 unsigned char c;
4307
4308 for (i = 0; i < len; i++)
4309 if (!isspace((c = line[i])))
4310 *dst++ = c;
4311
4312 return dst - line;
4313 }
4314
4315 static void patch_id_consume(void *priv, char *line, unsigned long len)
4316 {
4317 struct patch_id_t *data = priv;
4318 int new_len;
4319
4320 /* Ignore line numbers when computing the SHA1 of the patch */
4321 if (starts_with(line, "@@ -"))
4322 return;
4323
4324 new_len = remove_space(line, len);
4325
4326 git_SHA1_Update(data->ctx, line, new_len);
4327 data->patchlen += new_len;
4328 }
4329
4330 /* returns 0 upon success, and writes result into sha1 */
4331 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4332 {
4333 struct diff_queue_struct *q = &diff_queued_diff;
4334 int i;
4335 git_SHA_CTX ctx;
4336 struct patch_id_t data;
4337 char buffer[PATH_MAX * 4 + 20];
4338
4339 git_SHA1_Init(&ctx);
4340 memset(&data, 0, sizeof(struct patch_id_t));
4341 data.ctx = &ctx;
4342
4343 for (i = 0; i < q->nr; i++) {
4344 xpparam_t xpp;
4345 xdemitconf_t xecfg;
4346 mmfile_t mf1, mf2;
4347 struct diff_filepair *p = q->queue[i];
4348 int len1, len2;
4349
4350 memset(&xpp, 0, sizeof(xpp));
4351 memset(&xecfg, 0, sizeof(xecfg));
4352 if (p->status == 0)
4353 return error("internal diff status error");
4354 if (p->status == DIFF_STATUS_UNKNOWN)
4355 continue;
4356 if (diff_unmodified_pair(p))
4357 continue;
4358 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4359 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4360 continue;
4361 if (DIFF_PAIR_UNMERGED(p))
4362 continue;
4363
4364 diff_fill_sha1_info(p->one);
4365 diff_fill_sha1_info(p->two);
4366 if (fill_mmfile(&mf1, p->one) < 0 ||
4367 fill_mmfile(&mf2, p->two) < 0)
4368 return error("unable to read files to diff");
4369
4370 len1 = remove_space(p->one->path, strlen(p->one->path));
4371 len2 = remove_space(p->two->path, strlen(p->two->path));
4372 if (p->one->mode == 0)
4373 len1 = snprintf(buffer, sizeof(buffer),
4374 "diff--gita/%.*sb/%.*s"
4375 "newfilemode%06o"
4376 "---/dev/null"
4377 "+++b/%.*s",
4378 len1, p->one->path,
4379 len2, p->two->path,
4380 p->two->mode,
4381 len2, p->two->path);
4382 else if (p->two->mode == 0)
4383 len1 = snprintf(buffer, sizeof(buffer),
4384 "diff--gita/%.*sb/%.*s"
4385 "deletedfilemode%06o"
4386 "---a/%.*s"
4387 "+++/dev/null",
4388 len1, p->one->path,
4389 len2, p->two->path,
4390 p->one->mode,
4391 len1, p->one->path);
4392 else
4393 len1 = snprintf(buffer, sizeof(buffer),
4394 "diff--gita/%.*sb/%.*s"
4395 "---a/%.*s"
4396 "+++b/%.*s",
4397 len1, p->one->path,
4398 len2, p->two->path,
4399 len1, p->one->path,
4400 len2, p->two->path);
4401 git_SHA1_Update(&ctx, buffer, len1);
4402
4403 if (diff_filespec_is_binary(p->one) ||
4404 diff_filespec_is_binary(p->two)) {
4405 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4406 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4407 continue;
4408 }
4409
4410 xpp.flags = 0;
4411 xecfg.ctxlen = 3;
4412 xecfg.flags = 0;
4413 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4414 &xpp, &xecfg);
4415 }
4416
4417 git_SHA1_Final(sha1, &ctx);
4418 return 0;
4419 }
4420
4421 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4422 {
4423 struct diff_queue_struct *q = &diff_queued_diff;
4424 int i;
4425 int result = diff_get_patch_id(options, sha1);
4426
4427 for (i = 0; i < q->nr; i++)
4428 diff_free_filepair(q->queue[i]);
4429
4430 free(q->queue);
4431 DIFF_QUEUE_CLEAR(q);
4432
4433 return result;
4434 }
4435
4436 static int is_summary_empty(const struct diff_queue_struct *q)
4437 {
4438 int i;
4439
4440 for (i = 0; i < q->nr; i++) {
4441 const struct diff_filepair *p = q->queue[i];
4442
4443 switch (p->status) {
4444 case DIFF_STATUS_DELETED:
4445 case DIFF_STATUS_ADDED:
4446 case DIFF_STATUS_COPIED:
4447 case DIFF_STATUS_RENAMED:
4448 return 0;
4449 default:
4450 if (p->score)
4451 return 0;
4452 if (p->one->mode && p->two->mode &&
4453 p->one->mode != p->two->mode)
4454 return 0;
4455 break;
4456 }
4457 }
4458 return 1;
4459 }
4460
4461 static const char rename_limit_warning[] =
4462 "inexact rename detection was skipped due to too many files.";
4463
4464 static const char degrade_cc_to_c_warning[] =
4465 "only found copies from modified paths due to too many files.";
4466
4467 static const char rename_limit_advice[] =
4468 "you may want to set your %s variable to at least "
4469 "%d and retry the command.";
4470
4471 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4472 {
4473 if (degraded_cc)
4474 warning(degrade_cc_to_c_warning);
4475 else if (needed)
4476 warning(rename_limit_warning);
4477 else
4478 return;
4479 if (0 < needed && needed < 32767)
4480 warning(rename_limit_advice, varname, needed);
4481 }
4482
4483 void diff_flush(struct diff_options *options)
4484 {
4485 struct diff_queue_struct *q = &diff_queued_diff;
4486 int i, output_format = options->output_format;
4487 int separator = 0;
4488 int dirstat_by_line = 0;
4489
4490 /*
4491 * Order: raw, stat, summary, patch
4492 * or: name/name-status/checkdiff (other bits clear)
4493 */
4494 if (!q->nr)
4495 goto free_queue;
4496
4497 if (output_format & (DIFF_FORMAT_RAW |
4498 DIFF_FORMAT_NAME |
4499 DIFF_FORMAT_NAME_STATUS |
4500 DIFF_FORMAT_CHECKDIFF)) {
4501 for (i = 0; i < q->nr; i++) {
4502 struct diff_filepair *p = q->queue[i];
4503 if (check_pair_status(p))
4504 flush_one_pair(p, options);
4505 }
4506 separator++;
4507 }
4508
4509 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4510 dirstat_by_line = 1;
4511
4512 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4513 dirstat_by_line) {
4514 struct diffstat_t diffstat;
4515
4516 memset(&diffstat, 0, sizeof(struct diffstat_t));
4517 for (i = 0; i < q->nr; i++) {
4518 struct diff_filepair *p = q->queue[i];
4519 if (check_pair_status(p))
4520 diff_flush_stat(p, options, &diffstat);
4521 }
4522 if (output_format & DIFF_FORMAT_NUMSTAT)
4523 show_numstat(&diffstat, options);
4524 if (output_format & DIFF_FORMAT_DIFFSTAT)
4525 show_stats(&diffstat, options);
4526 if (output_format & DIFF_FORMAT_SHORTSTAT)
4527 show_shortstats(&diffstat, options);
4528 if (output_format & DIFF_FORMAT_DIRSTAT)
4529 show_dirstat_by_line(&diffstat, options);
4530 free_diffstat_info(&diffstat);
4531 separator++;
4532 }
4533 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4534 show_dirstat(options);
4535
4536 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4537 for (i = 0; i < q->nr; i++) {
4538 diff_summary(options, q->queue[i]);
4539 }
4540 separator++;
4541 }
4542
4543 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4544 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4545 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4546 /*
4547 * run diff_flush_patch for the exit status. setting
4548 * options->file to /dev/null should be safe, because we
4549 * aren't supposed to produce any output anyway.
4550 */
4551 if (options->close_file)
4552 fclose(options->file);
4553 options->file = fopen("/dev/null", "w");
4554 if (!options->file)
4555 die_errno("Could not open /dev/null");
4556 options->close_file = 1;
4557 for (i = 0; i < q->nr; i++) {
4558 struct diff_filepair *p = q->queue[i];
4559 if (check_pair_status(p))
4560 diff_flush_patch(p, options);
4561 if (options->found_changes)
4562 break;
4563 }
4564 }
4565
4566 if (output_format & DIFF_FORMAT_PATCH) {
4567 if (separator) {
4568 fprintf(options->file, "%s%c",
4569 diff_line_prefix(options),
4570 options->line_termination);
4571 if (options->stat_sep) {
4572 /* attach patch instead of inline */
4573 fputs(options->stat_sep, options->file);
4574 }
4575 }
4576
4577 for (i = 0; i < q->nr; i++) {
4578 struct diff_filepair *p = q->queue[i];
4579 if (check_pair_status(p))
4580 diff_flush_patch(p, options);
4581 }
4582 }
4583
4584 if (output_format & DIFF_FORMAT_CALLBACK)
4585 options->format_callback(q, options, options->format_callback_data);
4586
4587 for (i = 0; i < q->nr; i++)
4588 diff_free_filepair(q->queue[i]);
4589 free_queue:
4590 free(q->queue);
4591 DIFF_QUEUE_CLEAR(q);
4592 if (options->close_file)
4593 fclose(options->file);
4594
4595 /*
4596 * Report the content-level differences with HAS_CHANGES;
4597 * diff_addremove/diff_change does not set the bit when
4598 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4599 */
4600 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4601 if (options->found_changes)
4602 DIFF_OPT_SET(options, HAS_CHANGES);
4603 else
4604 DIFF_OPT_CLR(options, HAS_CHANGES);
4605 }
4606 }
4607
4608 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4609 {
4610 return (((p->status == DIFF_STATUS_MODIFIED) &&
4611 ((p->score &&
4612 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4613 (!p->score &&
4614 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4615 ((p->status != DIFF_STATUS_MODIFIED) &&
4616 filter_bit_tst(p->status, options)));
4617 }
4618
4619 static void diffcore_apply_filter(struct diff_options *options)
4620 {
4621 int i;
4622 struct diff_queue_struct *q = &diff_queued_diff;
4623 struct diff_queue_struct outq;
4624
4625 DIFF_QUEUE_CLEAR(&outq);
4626
4627 if (!options->filter)
4628 return;
4629
4630 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4631 int found;
4632 for (i = found = 0; !found && i < q->nr; i++) {
4633 if (match_filter(options, q->queue[i]))
4634 found++;
4635 }
4636 if (found)
4637 return;
4638
4639 /* otherwise we will clear the whole queue
4640 * by copying the empty outq at the end of this
4641 * function, but first clear the current entries
4642 * in the queue.
4643 */
4644 for (i = 0; i < q->nr; i++)
4645 diff_free_filepair(q->queue[i]);
4646 }
4647 else {
4648 /* Only the matching ones */
4649 for (i = 0; i < q->nr; i++) {
4650 struct diff_filepair *p = q->queue[i];
4651 if (match_filter(options, p))
4652 diff_q(&outq, p);
4653 else
4654 diff_free_filepair(p);
4655 }
4656 }
4657 free(q->queue);
4658 *q = outq;
4659 }
4660
4661 /* Check whether two filespecs with the same mode and size are identical */
4662 static int diff_filespec_is_identical(struct diff_filespec *one,
4663 struct diff_filespec *two)
4664 {
4665 if (S_ISGITLINK(one->mode))
4666 return 0;
4667 if (diff_populate_filespec(one, 0))
4668 return 0;
4669 if (diff_populate_filespec(two, 0))
4670 return 0;
4671 return !memcmp(one->data, two->data, one->size);
4672 }
4673
4674 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4675 {
4676 if (p->done_skip_stat_unmatch)
4677 return p->skip_stat_unmatch_result;
4678
4679 p->done_skip_stat_unmatch = 1;
4680 p->skip_stat_unmatch_result = 0;
4681 /*
4682 * 1. Entries that come from stat info dirtiness
4683 * always have both sides (iow, not create/delete),
4684 * one side of the object name is unknown, with
4685 * the same mode and size. Keep the ones that
4686 * do not match these criteria. They have real
4687 * differences.
4688 *
4689 * 2. At this point, the file is known to be modified,
4690 * with the same mode and size, and the object
4691 * name of one side is unknown. Need to inspect
4692 * the identical contents.
4693 */
4694 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4695 !DIFF_FILE_VALID(p->two) ||
4696 (p->one->sha1_valid && p->two->sha1_valid) ||
4697 (p->one->mode != p->two->mode) ||
4698 diff_populate_filespec(p->one, 1) ||
4699 diff_populate_filespec(p->two, 1) ||
4700 (p->one->size != p->two->size) ||
4701 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4702 p->skip_stat_unmatch_result = 1;
4703 return p->skip_stat_unmatch_result;
4704 }
4705
4706 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4707 {
4708 int i;
4709 struct diff_queue_struct *q = &diff_queued_diff;
4710 struct diff_queue_struct outq;
4711 DIFF_QUEUE_CLEAR(&outq);
4712
4713 for (i = 0; i < q->nr; i++) {
4714 struct diff_filepair *p = q->queue[i];
4715
4716 if (diff_filespec_check_stat_unmatch(p))
4717 diff_q(&outq, p);
4718 else {
4719 /*
4720 * The caller can subtract 1 from skip_stat_unmatch
4721 * to determine how many paths were dirty only
4722 * due to stat info mismatch.
4723 */
4724 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4725 diffopt->skip_stat_unmatch++;
4726 diff_free_filepair(p);
4727 }
4728 }
4729 free(q->queue);
4730 *q = outq;
4731 }
4732
4733 static int diffnamecmp(const void *a_, const void *b_)
4734 {
4735 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4736 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4737 const char *name_a, *name_b;
4738
4739 name_a = a->one ? a->one->path : a->two->path;
4740 name_b = b->one ? b->one->path : b->two->path;
4741 return strcmp(name_a, name_b);
4742 }
4743
4744 void diffcore_fix_diff_index(struct diff_options *options)
4745 {
4746 struct diff_queue_struct *q = &diff_queued_diff;
4747 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4748 }
4749
4750 void diffcore_std(struct diff_options *options)
4751 {
4752 if (options->skip_stat_unmatch)
4753 diffcore_skip_stat_unmatch(options);
4754 if (!options->found_follow) {
4755 /* See try_to_follow_renames() in tree-diff.c */
4756 if (options->break_opt != -1)
4757 diffcore_break(options->break_opt);
4758 if (options->detect_rename)
4759 diffcore_rename(options);
4760 if (options->break_opt != -1)
4761 diffcore_merge_broken();
4762 }
4763 if (options->pickaxe)
4764 diffcore_pickaxe(options);
4765 if (options->orderfile)
4766 diffcore_order(options->orderfile);
4767 if (!options->found_follow)
4768 /* See try_to_follow_renames() in tree-diff.c */
4769 diff_resolve_rename_copy();
4770 diffcore_apply_filter(options);
4771
4772 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4773 DIFF_OPT_SET(options, HAS_CHANGES);
4774 else
4775 DIFF_OPT_CLR(options, HAS_CHANGES);
4776
4777 options->found_follow = 0;
4778 }
4779
4780 int diff_result_code(struct diff_options *opt, int status)
4781 {
4782 int result = 0;
4783
4784 diff_warn_rename_limit("diff.renameLimit",
4785 opt->needed_rename_limit,
4786 opt->degraded_cc_to_c);
4787 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4788 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4789 return status;
4790 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4791 DIFF_OPT_TST(opt, HAS_CHANGES))
4792 result |= 01;
4793 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4794 DIFF_OPT_TST(opt, CHECK_FAILED))
4795 result |= 02;
4796 return result;
4797 }
4798
4799 int diff_can_quit_early(struct diff_options *opt)
4800 {
4801 return (DIFF_OPT_TST(opt, QUICK) &&
4802 !opt->filter &&
4803 DIFF_OPT_TST(opt, HAS_CHANGES));
4804 }
4805
4806 /*
4807 * Shall changes to this submodule be ignored?
4808 *
4809 * Submodule changes can be configured to be ignored separately for each path,
4810 * but that configuration can be overridden from the command line.
4811 */
4812 static int is_submodule_ignored(const char *path, struct diff_options *options)
4813 {
4814 int ignored = 0;
4815 unsigned orig_flags = options->flags;
4816 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4817 set_diffopt_flags_from_submodule_config(options, path);
4818 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4819 ignored = 1;
4820 options->flags = orig_flags;
4821 return ignored;
4822 }
4823
4824 void diff_addremove(struct diff_options *options,
4825 int addremove, unsigned mode,
4826 const unsigned char *sha1,
4827 int sha1_valid,
4828 const char *concatpath, unsigned dirty_submodule)
4829 {
4830 struct diff_filespec *one, *two;
4831
4832 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4833 return;
4834
4835 /* This may look odd, but it is a preparation for
4836 * feeding "there are unchanged files which should
4837 * not produce diffs, but when you are doing copy
4838 * detection you would need them, so here they are"
4839 * entries to the diff-core. They will be prefixed
4840 * with something like '=' or '*' (I haven't decided
4841 * which but should not make any difference).
4842 * Feeding the same new and old to diff_change()
4843 * also has the same effect.
4844 * Before the final output happens, they are pruned after
4845 * merged into rename/copy pairs as appropriate.
4846 */
4847 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4848 addremove = (addremove == '+' ? '-' :
4849 addremove == '-' ? '+' : addremove);
4850
4851 if (options->prefix &&
4852 strncmp(concatpath, options->prefix, options->prefix_length))
4853 return;
4854
4855 one = alloc_filespec(concatpath);
4856 two = alloc_filespec(concatpath);
4857
4858 if (addremove != '+')
4859 fill_filespec(one, sha1, sha1_valid, mode);
4860 if (addremove != '-') {
4861 fill_filespec(two, sha1, sha1_valid, mode);
4862 two->dirty_submodule = dirty_submodule;
4863 }
4864
4865 diff_queue(&diff_queued_diff, one, two);
4866 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4867 DIFF_OPT_SET(options, HAS_CHANGES);
4868 }
4869
4870 void diff_change(struct diff_options *options,
4871 unsigned old_mode, unsigned new_mode,
4872 const unsigned char *old_sha1,
4873 const unsigned char *new_sha1,
4874 int old_sha1_valid, int new_sha1_valid,
4875 const char *concatpath,
4876 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4877 {
4878 struct diff_filespec *one, *two;
4879 struct diff_filepair *p;
4880
4881 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4882 is_submodule_ignored(concatpath, options))
4883 return;
4884
4885 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4886 unsigned tmp;
4887 const unsigned char *tmp_c;
4888 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4889 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4890 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4891 new_sha1_valid = tmp;
4892 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4893 new_dirty_submodule = tmp;
4894 }
4895
4896 if (options->prefix &&
4897 strncmp(concatpath, options->prefix, options->prefix_length))
4898 return;
4899
4900 one = alloc_filespec(concatpath);
4901 two = alloc_filespec(concatpath);
4902 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4903 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4904 one->dirty_submodule = old_dirty_submodule;
4905 two->dirty_submodule = new_dirty_submodule;
4906 p = diff_queue(&diff_queued_diff, one, two);
4907
4908 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4909 return;
4910
4911 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
4912 !diff_filespec_check_stat_unmatch(p))
4913 return;
4914
4915 DIFF_OPT_SET(options, HAS_CHANGES);
4916 }
4917
4918 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4919 {
4920 struct diff_filepair *pair;
4921 struct diff_filespec *one, *two;
4922
4923 if (options->prefix &&
4924 strncmp(path, options->prefix, options->prefix_length))
4925 return NULL;
4926
4927 one = alloc_filespec(path);
4928 two = alloc_filespec(path);
4929 pair = diff_queue(&diff_queued_diff, one, two);
4930 pair->is_unmerged = 1;
4931 return pair;
4932 }
4933
4934 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4935 size_t *outsize)
4936 {
4937 struct diff_tempfile *temp;
4938 const char *argv[3];
4939 const char **arg = argv;
4940 struct child_process child;
4941 struct strbuf buf = STRBUF_INIT;
4942 int err = 0;
4943
4944 temp = prepare_temp_file(spec->path, spec);
4945 *arg++ = pgm;
4946 *arg++ = temp->name;
4947 *arg = NULL;
4948
4949 memset(&child, 0, sizeof(child));
4950 child.use_shell = 1;
4951 child.argv = argv;
4952 child.out = -1;
4953 if (start_command(&child)) {
4954 remove_tempfile();
4955 return NULL;
4956 }
4957
4958 if (strbuf_read(&buf, child.out, 0) < 0)
4959 err = error("error reading from textconv command '%s'", pgm);
4960 close(child.out);
4961
4962 if (finish_command(&child) || err) {
4963 strbuf_release(&buf);
4964 remove_tempfile();
4965 return NULL;
4966 }
4967 remove_tempfile();
4968
4969 return strbuf_detach(&buf, outsize);
4970 }
4971
4972 size_t fill_textconv(struct userdiff_driver *driver,
4973 struct diff_filespec *df,
4974 char **outbuf)
4975 {
4976 size_t size;
4977
4978 if (!driver || !driver->textconv) {
4979 if (!DIFF_FILE_VALID(df)) {
4980 *outbuf = "";
4981 return 0;
4982 }
4983 if (diff_populate_filespec(df, 0))
4984 die("unable to read files to diff");
4985 *outbuf = df->data;
4986 return df->size;
4987 }
4988
4989 if (driver->textconv_cache && df->sha1_valid) {
4990 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4991 &size);
4992 if (*outbuf)
4993 return size;
4994 }
4995
4996 *outbuf = run_textconv(driver->textconv, df, &size);
4997 if (!*outbuf)
4998 die("unable to read files to diff");
4999
5000 if (driver->textconv_cache && df->sha1_valid) {
5001 /* ignore errors, as we might be in a readonly repository */
5002 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
5003 size);
5004 /*
5005 * we could save up changes and flush them all at the end,
5006 * but we would need an extra call after all diffing is done.
5007 * Since generating a cache entry is the slow path anyway,
5008 * this extra overhead probably isn't a big deal.
5009 */
5010 notes_cache_write(driver->textconv_cache);
5011 }
5012
5013 return size;
5014 }
5015
5016 void setup_diff_pager(struct diff_options *opt)
5017 {
5018 /*
5019 * If the user asked for our exit code, then either they want --quiet
5020 * or --exit-code. We should definitely not bother with a pager in the
5021 * former case, as we will generate no output. Since we still properly
5022 * report our exit code even when a pager is run, we _could_ run a
5023 * pager with --exit-code. But since we have not done so historically,
5024 * and because it is easy to find people oneline advising "git diff
5025 * --exit-code" in hooks and other scripts, we do not do so.
5026 */
5027 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5028 check_pager_config("diff") != 0)
5029 setup_pager();
5030 }
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