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Update draft release notes to Git 2.0
[git.git] / diff.c
blobe343191bdaba0dbf63a841a79287cbb5f56fc18a
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 /*
1465 * TRANSLATORS: "+" in (+) is a line addition marker;
1466 * do not translate it.
1467 */
1468 strbuf_addf(&sb,
1469 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1470 insertions);
1471 }
1472
1473 if (deletions || insertions == 0) {
1474 /*
1475 * TRANSLATORS: "-" in (-) is a line removal marker;
1476 * do not translate it.
1477 */
1478 strbuf_addf(&sb,
1479 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1480 deletions);
1481 }
1482 strbuf_addch(&sb, '\n');
1483 ret = fputs(sb.buf, fp);
1484 strbuf_release(&sb);
1485 return ret;
1486 }
1487
1488 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1489 {
1490 int i, len, add, del, adds = 0, dels = 0;
1491 uintmax_t max_change = 0, max_len = 0;
1492 int total_files = data->nr, count;
1493 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1494 const char *reset, *add_c, *del_c;
1495 const char *line_prefix = "";
1496 int extra_shown = 0;
1497
1498 if (data->nr == 0)
1499 return;
1500
1501 line_prefix = diff_line_prefix(options);
1502 count = options->stat_count ? options->stat_count : data->nr;
1503
1504 reset = diff_get_color_opt(options, DIFF_RESET);
1505 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1506 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1507
1508 /*
1509 * Find the longest filename and max number of changes
1510 */
1511 for (i = 0; (i < count) && (i < data->nr); i++) {
1512 struct diffstat_file *file = data->files[i];
1513 uintmax_t change = file->added + file->deleted;
1514
1515 if (!file->is_interesting && (change == 0)) {
1516 count++; /* not shown == room for one more */
1517 continue;
1518 }
1519 fill_print_name(file);
1520 len = strlen(file->print_name);
1521 if (max_len < len)
1522 max_len = len;
1523
1524 if (file->is_unmerged) {
1525 /* "Unmerged" is 8 characters */
1526 bin_width = bin_width < 8 ? 8 : bin_width;
1527 continue;
1528 }
1529 if (file->is_binary) {
1530 /* "Bin XXX -> YYY bytes" */
1531 int w = 14 + decimal_width(file->added)
1532 + decimal_width(file->deleted);
1533 bin_width = bin_width < w ? w : bin_width;
1534 /* Display change counts aligned with "Bin" */
1535 number_width = 3;
1536 continue;
1537 }
1538
1539 if (max_change < change)
1540 max_change = change;
1541 }
1542 count = i; /* where we can stop scanning in data->files[] */
1543
1544 /*
1545 * We have width = stat_width or term_columns() columns total.
1546 * We want a maximum of min(max_len, stat_name_width) for the name part.
1547 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1548 * We also need 1 for " " and 4 + decimal_width(max_change)
1549 * for " | NNNN " and one the empty column at the end, altogether
1550 * 6 + decimal_width(max_change).
1551 *
1552 * If there's not enough space, we will use the smaller of
1553 * stat_name_width (if set) and 5/8*width for the filename,
1554 * and the rest for constant elements + graph part, but no more
1555 * than stat_graph_width for the graph part.
1556 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1557 * for the standard terminal size).
1558 *
1559 * In other words: stat_width limits the maximum width, and
1560 * stat_name_width fixes the maximum width of the filename,
1561 * and is also used to divide available columns if there
1562 * aren't enough.
1563 *
1564 * Binary files are displayed with "Bin XXX -> YYY bytes"
1565 * instead of the change count and graph. This part is treated
1566 * similarly to the graph part, except that it is not
1567 * "scaled". If total width is too small to accommodate the
1568 * guaranteed minimum width of the filename part and the
1569 * separators and this message, this message will "overflow"
1570 * making the line longer than the maximum width.
1571 */
1572
1573 if (options->stat_width == -1)
1574 width = term_columns() - options->output_prefix_length;
1575 else
1576 width = options->stat_width ? options->stat_width : 80;
1577 number_width = decimal_width(max_change) > number_width ?
1578 decimal_width(max_change) : number_width;
1579
1580 if (options->stat_graph_width == -1)
1581 options->stat_graph_width = diff_stat_graph_width;
1582
1583 /*
1584 * Guarantee 3/8*16==6 for the graph part
1585 * and 5/8*16==10 for the filename part
1586 */
1587 if (width < 16 + 6 + number_width)
1588 width = 16 + 6 + number_width;
1589
1590 /*
1591 * First assign sizes that are wanted, ignoring available width.
1592 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1593 * starting from "XXX" should fit in graph_width.
1594 */
1595 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1596 if (options->stat_graph_width &&
1597 options->stat_graph_width < graph_width)
1598 graph_width = options->stat_graph_width;
1599
1600 name_width = (options->stat_name_width > 0 &&
1601 options->stat_name_width < max_len) ?
1602 options->stat_name_width : max_len;
1603
1604 /*
1605 * Adjust adjustable widths not to exceed maximum width
1606 */
1607 if (name_width + number_width + 6 + graph_width > width) {
1608 if (graph_width > width * 3/8 - number_width - 6) {
1609 graph_width = width * 3/8 - number_width - 6;
1610 if (graph_width < 6)
1611 graph_width = 6;
1612 }
1613
1614 if (options->stat_graph_width &&
1615 graph_width > options->stat_graph_width)
1616 graph_width = options->stat_graph_width;
1617 if (name_width > width - number_width - 6 - graph_width)
1618 name_width = width - number_width - 6 - graph_width;
1619 else
1620 graph_width = width - number_width - 6 - name_width;
1621 }
1622
1623 /*
1624 * From here name_width is the width of the name area,
1625 * and graph_width is the width of the graph area.
1626 * max_change is used to scale graph properly.
1627 */
1628 for (i = 0; i < count; i++) {
1629 const char *prefix = "";
1630 struct diffstat_file *file = data->files[i];
1631 char *name = file->print_name;
1632 uintmax_t added = file->added;
1633 uintmax_t deleted = file->deleted;
1634 int name_len;
1635
1636 if (!file->is_interesting && (added + deleted == 0))
1637 continue;
1638
1639 /*
1640 * "scale" the filename
1641 */
1642 len = name_width;
1643 name_len = strlen(name);
1644 if (name_width < name_len) {
1645 char *slash;
1646 prefix = "...";
1647 len -= 3;
1648 name += name_len - len;
1649 slash = strchr(name, '/');
1650 if (slash)
1651 name = slash;
1652 }
1653
1654 if (file->is_binary) {
1655 fprintf(options->file, "%s", line_prefix);
1656 show_name(options->file, prefix, name, len);
1657 fprintf(options->file, " %*s", number_width, "Bin");
1658 if (!added && !deleted) {
1659 putc('\n', options->file);
1660 continue;
1661 }
1662 fprintf(options->file, " %s%"PRIuMAX"%s",
1663 del_c, deleted, reset);
1664 fprintf(options->file, " -> ");
1665 fprintf(options->file, "%s%"PRIuMAX"%s",
1666 add_c, added, reset);
1667 fprintf(options->file, " bytes");
1668 fprintf(options->file, "\n");
1669 continue;
1670 }
1671 else if (file->is_unmerged) {
1672 fprintf(options->file, "%s", line_prefix);
1673 show_name(options->file, prefix, name, len);
1674 fprintf(options->file, " Unmerged\n");
1675 continue;
1676 }
1677
1678 /*
1679 * scale the add/delete
1680 */
1681 add = added;
1682 del = deleted;
1683
1684 if (graph_width <= max_change) {
1685 int total = scale_linear(add + del, graph_width, max_change);
1686 if (total < 2 && add && del)
1687 /* width >= 2 due to the sanity check */
1688 total = 2;
1689 if (add < del) {
1690 add = scale_linear(add, graph_width, max_change);
1691 del = total - add;
1692 } else {
1693 del = scale_linear(del, graph_width, max_change);
1694 add = total - del;
1695 }
1696 }
1697 fprintf(options->file, "%s", line_prefix);
1698 show_name(options->file, prefix, name, len);
1699 fprintf(options->file, " %*"PRIuMAX"%s",
1700 number_width, added + deleted,
1701 added + deleted ? " " : "");
1702 show_graph(options->file, '+', add, add_c, reset);
1703 show_graph(options->file, '-', del, del_c, reset);
1704 fprintf(options->file, "\n");
1705 }
1706
1707 for (i = 0; i < data->nr; i++) {
1708 struct diffstat_file *file = data->files[i];
1709 uintmax_t added = file->added;
1710 uintmax_t deleted = file->deleted;
1711
1712 if (file->is_unmerged ||
1713 (!file->is_interesting && (added + deleted == 0))) {
1714 total_files--;
1715 continue;
1716 }
1717
1718 if (!file->is_binary) {
1719 adds += added;
1720 dels += deleted;
1721 }
1722 if (i < count)
1723 continue;
1724 if (!extra_shown)
1725 fprintf(options->file, "%s ...\n", line_prefix);
1726 extra_shown = 1;
1727 }
1728 fprintf(options->file, "%s", line_prefix);
1729 print_stat_summary(options->file, total_files, adds, dels);
1730 }
1731
1732 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1733 {
1734 int i, adds = 0, dels = 0, total_files = data->nr;
1735
1736 if (data->nr == 0)
1737 return;
1738
1739 for (i = 0; i < data->nr; i++) {
1740 int added = data->files[i]->added;
1741 int deleted= data->files[i]->deleted;
1742
1743 if (data->files[i]->is_unmerged ||
1744 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1745 total_files--;
1746 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1747 adds += added;
1748 dels += deleted;
1749 }
1750 }
1751 fprintf(options->file, "%s", diff_line_prefix(options));
1752 print_stat_summary(options->file, total_files, adds, dels);
1753 }
1754
1755 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1756 {
1757 int i;
1758
1759 if (data->nr == 0)
1760 return;
1761
1762 for (i = 0; i < data->nr; i++) {
1763 struct diffstat_file *file = data->files[i];
1764
1765 fprintf(options->file, "%s", diff_line_prefix(options));
1766
1767 if (file->is_binary)
1768 fprintf(options->file, "-\t-\t");
1769 else
1770 fprintf(options->file,
1771 "%"PRIuMAX"\t%"PRIuMAX"\t",
1772 file->added, file->deleted);
1773 if (options->line_termination) {
1774 fill_print_name(file);
1775 if (!file->is_renamed)
1776 write_name_quoted(file->name, options->file,
1777 options->line_termination);
1778 else {
1779 fputs(file->print_name, options->file);
1780 putc(options->line_termination, options->file);
1781 }
1782 } else {
1783 if (file->is_renamed) {
1784 putc('\0', options->file);
1785 write_name_quoted(file->from_name, options->file, '\0');
1786 }
1787 write_name_quoted(file->name, options->file, '\0');
1788 }
1789 }
1790 }
1791
1792 struct dirstat_file {
1793 const char *name;
1794 unsigned long changed;
1795 };
1796
1797 struct dirstat_dir {
1798 struct dirstat_file *files;
1799 int alloc, nr, permille, cumulative;
1800 };
1801
1802 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1803 unsigned long changed, const char *base, int baselen)
1804 {
1805 unsigned long this_dir = 0;
1806 unsigned int sources = 0;
1807 const char *line_prefix = diff_line_prefix(opt);
1808
1809 while (dir->nr) {
1810 struct dirstat_file *f = dir->files;
1811 int namelen = strlen(f->name);
1812 unsigned long this;
1813 char *slash;
1814
1815 if (namelen < baselen)
1816 break;
1817 if (memcmp(f->name, base, baselen))
1818 break;
1819 slash = strchr(f->name + baselen, '/');
1820 if (slash) {
1821 int newbaselen = slash + 1 - f->name;
1822 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1823 sources++;
1824 } else {
1825 this = f->changed;
1826 dir->files++;
1827 dir->nr--;
1828 sources += 2;
1829 }
1830 this_dir += this;
1831 }
1832
1833 /*
1834 * We don't report dirstat's for
1835 * - the top level
1836 * - or cases where everything came from a single directory
1837 * under this directory (sources == 1).
1838 */
1839 if (baselen && sources != 1) {
1840 if (this_dir) {
1841 int permille = this_dir * 1000 / changed;
1842 if (permille >= dir->permille) {
1843 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1844 permille / 10, permille % 10, baselen, base);
1845 if (!dir->cumulative)
1846 return 0;
1847 }
1848 }
1849 }
1850 return this_dir;
1851 }
1852
1853 static int dirstat_compare(const void *_a, const void *_b)
1854 {
1855 const struct dirstat_file *a = _a;
1856 const struct dirstat_file *b = _b;
1857 return strcmp(a->name, b->name);
1858 }
1859
1860 static void show_dirstat(struct diff_options *options)
1861 {
1862 int i;
1863 unsigned long changed;
1864 struct dirstat_dir dir;
1865 struct diff_queue_struct *q = &diff_queued_diff;
1866
1867 dir.files = NULL;
1868 dir.alloc = 0;
1869 dir.nr = 0;
1870 dir.permille = options->dirstat_permille;
1871 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1872
1873 changed = 0;
1874 for (i = 0; i < q->nr; i++) {
1875 struct diff_filepair *p = q->queue[i];
1876 const char *name;
1877 unsigned long copied, added, damage;
1878 int content_changed;
1879
1880 name = p->two->path ? p->two->path : p->one->path;
1881
1882 if (p->one->sha1_valid && p->two->sha1_valid)
1883 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1884 else
1885 content_changed = 1;
1886
1887 if (!content_changed) {
1888 /*
1889 * The SHA1 has not changed, so pre-/post-content is
1890 * identical. We can therefore skip looking at the
1891 * file contents altogether.
1892 */
1893 damage = 0;
1894 goto found_damage;
1895 }
1896
1897 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1898 /*
1899 * In --dirstat-by-file mode, we don't really need to
1900 * look at the actual file contents at all.
1901 * The fact that the SHA1 changed is enough for us to
1902 * add this file to the list of results
1903 * (with each file contributing equal damage).
1904 */
1905 damage = 1;
1906 goto found_damage;
1907 }
1908
1909 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1910 diff_populate_filespec(p->one, 0);
1911 diff_populate_filespec(p->two, 0);
1912 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1913 &copied, &added);
1914 diff_free_filespec_data(p->one);
1915 diff_free_filespec_data(p->two);
1916 } else if (DIFF_FILE_VALID(p->one)) {
1917 diff_populate_filespec(p->one, 1);
1918 copied = added = 0;
1919 diff_free_filespec_data(p->one);
1920 } else if (DIFF_FILE_VALID(p->two)) {
1921 diff_populate_filespec(p->two, 1);
1922 copied = 0;
1923 added = p->two->size;
1924 diff_free_filespec_data(p->two);
1925 } else
1926 continue;
1927
1928 /*
1929 * Original minus copied is the removed material,
1930 * added is the new material. They are both damages
1931 * made to the preimage.
1932 * If the resulting damage is zero, we know that
1933 * diffcore_count_changes() considers the two entries to
1934 * be identical, but since content_changed is true, we
1935 * know that there must have been _some_ kind of change,
1936 * so we force all entries to have damage > 0.
1937 */
1938 damage = (p->one->size - copied) + added;
1939 if (!damage)
1940 damage = 1;
1941
1942 found_damage:
1943 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1944 dir.files[dir.nr].name = name;
1945 dir.files[dir.nr].changed = damage;
1946 changed += damage;
1947 dir.nr++;
1948 }
1949
1950 /* This can happen even with many files, if everything was renames */
1951 if (!changed)
1952 return;
1953
1954 /* Show all directories with more than x% of the changes */
1955 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1956 gather_dirstat(options, &dir, changed, "", 0);
1957 }
1958
1959 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1960 {
1961 int i;
1962 unsigned long changed;
1963 struct dirstat_dir dir;
1964
1965 if (data->nr == 0)
1966 return;
1967
1968 dir.files = NULL;
1969 dir.alloc = 0;
1970 dir.nr = 0;
1971 dir.permille = options->dirstat_permille;
1972 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1973
1974 changed = 0;
1975 for (i = 0; i < data->nr; i++) {
1976 struct diffstat_file *file = data->files[i];
1977 unsigned long damage = file->added + file->deleted;
1978 if (file->is_binary)
1979 /*
1980 * binary files counts bytes, not lines. Must find some
1981 * way to normalize binary bytes vs. textual lines.
1982 * The following heuristic assumes that there are 64
1983 * bytes per "line".
1984 * This is stupid and ugly, but very cheap...
1985 */
1986 damage = (damage + 63) / 64;
1987 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1988 dir.files[dir.nr].name = file->name;
1989 dir.files[dir.nr].changed = damage;
1990 changed += damage;
1991 dir.nr++;
1992 }
1993
1994 /* This can happen even with many files, if everything was renames */
1995 if (!changed)
1996 return;
1997
1998 /* Show all directories with more than x% of the changes */
1999 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2000 gather_dirstat(options, &dir, changed, "", 0);
2001 }
2002
2003 static void free_diffstat_info(struct diffstat_t *diffstat)
2004 {
2005 int i;
2006 for (i = 0; i < diffstat->nr; i++) {
2007 struct diffstat_file *f = diffstat->files[i];
2008 if (f->name != f->print_name)
2009 free(f->print_name);
2010 free(f->name);
2011 free(f->from_name);
2012 free(f);
2013 }
2014 free(diffstat->files);
2015 }
2016
2017 struct checkdiff_t {
2018 const char *filename;
2019 int lineno;
2020 int conflict_marker_size;
2021 struct diff_options *o;
2022 unsigned ws_rule;
2023 unsigned status;
2024 };
2025
2026 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2027 {
2028 char firstchar;
2029 int cnt;
2030
2031 if (len < marker_size + 1)
2032 return 0;
2033 firstchar = line[0];
2034 switch (firstchar) {
2035 case '=': case '>': case '<': case '|':
2036 break;
2037 default:
2038 return 0;
2039 }
2040 for (cnt = 1; cnt < marker_size; cnt++)
2041 if (line[cnt] != firstchar)
2042 return 0;
2043 /* line[1] thru line[marker_size-1] are same as firstchar */
2044 if (len < marker_size + 1 || !isspace(line[marker_size]))
2045 return 0;
2046 return 1;
2047 }
2048
2049 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2050 {
2051 struct checkdiff_t *data = priv;
2052 int marker_size = data->conflict_marker_size;
2053 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2054 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2055 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2056 char *err;
2057 const char *line_prefix;
2058
2059 assert(data->o);
2060 line_prefix = diff_line_prefix(data->o);
2061
2062 if (line[0] == '+') {
2063 unsigned bad;
2064 data->lineno++;
2065 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2066 data->status |= 1;
2067 fprintf(data->o->file,
2068 "%s%s:%d: leftover conflict marker\n",
2069 line_prefix, data->filename, data->lineno);
2070 }
2071 bad = ws_check(line + 1, len - 1, data->ws_rule);
2072 if (!bad)
2073 return;
2074 data->status |= bad;
2075 err = whitespace_error_string(bad);
2076 fprintf(data->o->file, "%s%s:%d: %s.\n",
2077 line_prefix, data->filename, data->lineno, err);
2078 free(err);
2079 emit_line(data->o, set, reset, line, 1);
2080 ws_check_emit(line + 1, len - 1, data->ws_rule,
2081 data->o->file, set, reset, ws);
2082 } else if (line[0] == ' ') {
2083 data->lineno++;
2084 } else if (line[0] == '@') {
2085 char *plus = strchr(line, '+');
2086 if (plus)
2087 data->lineno = strtol(plus, NULL, 10) - 1;
2088 else
2089 die("invalid diff");
2090 }
2091 }
2092
2093 static unsigned char *deflate_it(char *data,
2094 unsigned long size,
2095 unsigned long *result_size)
2096 {
2097 int bound;
2098 unsigned char *deflated;
2099 git_zstream stream;
2100
2101 memset(&stream, 0, sizeof(stream));
2102 git_deflate_init(&stream, zlib_compression_level);
2103 bound = git_deflate_bound(&stream, size);
2104 deflated = xmalloc(bound);
2105 stream.next_out = deflated;
2106 stream.avail_out = bound;
2107
2108 stream.next_in = (unsigned char *)data;
2109 stream.avail_in = size;
2110 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2111 ; /* nothing */
2112 git_deflate_end(&stream);
2113 *result_size = stream.total_out;
2114 return deflated;
2115 }
2116
2117 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2118 const char *prefix)
2119 {
2120 void *cp;
2121 void *delta;
2122 void *deflated;
2123 void *data;
2124 unsigned long orig_size;
2125 unsigned long delta_size;
2126 unsigned long deflate_size;
2127 unsigned long data_size;
2128
2129 /* We could do deflated delta, or we could do just deflated two,
2130 * whichever is smaller.
2131 */
2132 delta = NULL;
2133 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2134 if (one->size && two->size) {
2135 delta = diff_delta(one->ptr, one->size,
2136 two->ptr, two->size,
2137 &delta_size, deflate_size);
2138 if (delta) {
2139 void *to_free = delta;
2140 orig_size = delta_size;
2141 delta = deflate_it(delta, delta_size, &delta_size);
2142 free(to_free);
2143 }
2144 }
2145
2146 if (delta && delta_size < deflate_size) {
2147 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2148 free(deflated);
2149 data = delta;
2150 data_size = delta_size;
2151 }
2152 else {
2153 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2154 free(delta);
2155 data = deflated;
2156 data_size = deflate_size;
2157 }
2158
2159 /* emit data encoded in base85 */
2160 cp = data;
2161 while (data_size) {
2162 int bytes = (52 < data_size) ? 52 : data_size;
2163 char line[70];
2164 data_size -= bytes;
2165 if (bytes <= 26)
2166 line[0] = bytes + 'A' - 1;
2167 else
2168 line[0] = bytes - 26 + 'a' - 1;
2169 encode_85(line + 1, cp, bytes);
2170 cp = (char *) cp + bytes;
2171 fprintf(file, "%s", prefix);
2172 fputs(line, file);
2173 fputc('\n', file);
2174 }
2175 fprintf(file, "%s\n", prefix);
2176 free(data);
2177 }
2178
2179 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2180 const char *prefix)
2181 {
2182 fprintf(file, "%sGIT binary patch\n", prefix);
2183 emit_binary_diff_body(file, one, two, prefix);
2184 emit_binary_diff_body(file, two, one, prefix);
2185 }
2186
2187 int diff_filespec_is_binary(struct diff_filespec *one)
2188 {
2189 if (one->is_binary == -1) {
2190 diff_filespec_load_driver(one);
2191 if (one->driver->binary != -1)
2192 one->is_binary = one->driver->binary;
2193 else {
2194 if (!one->data && DIFF_FILE_VALID(one))
2195 diff_populate_filespec(one, 0);
2196 if (one->data)
2197 one->is_binary = buffer_is_binary(one->data,
2198 one->size);
2199 if (one->is_binary == -1)
2200 one->is_binary = 0;
2201 }
2202 }
2203 return one->is_binary;
2204 }
2205
2206 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2207 {
2208 diff_filespec_load_driver(one);
2209 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2210 }
2211
2212 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2213 {
2214 if (!options->a_prefix)
2215 options->a_prefix = a;
2216 if (!options->b_prefix)
2217 options->b_prefix = b;
2218 }
2219
2220 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2221 {
2222 if (!DIFF_FILE_VALID(one))
2223 return NULL;
2224
2225 diff_filespec_load_driver(one);
2226 return userdiff_get_textconv(one->driver);
2227 }
2228
2229 static void builtin_diff(const char *name_a,
2230 const char *name_b,
2231 struct diff_filespec *one,
2232 struct diff_filespec *two,
2233 const char *xfrm_msg,
2234 int must_show_header,
2235 struct diff_options *o,
2236 int complete_rewrite)
2237 {
2238 mmfile_t mf1, mf2;
2239 const char *lbl[2];
2240 char *a_one, *b_two;
2241 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2242 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2243 const char *a_prefix, *b_prefix;
2244 struct userdiff_driver *textconv_one = NULL;
2245 struct userdiff_driver *textconv_two = NULL;
2246 struct strbuf header = STRBUF_INIT;
2247 const char *line_prefix = diff_line_prefix(o);
2248
2249 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2250 (!one->mode || S_ISGITLINK(one->mode)) &&
2251 (!two->mode || S_ISGITLINK(two->mode))) {
2252 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2253 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2254 show_submodule_summary(o->file, one->path ? one->path : two->path,
2255 line_prefix,
2256 one->sha1, two->sha1, two->dirty_submodule,
2257 meta, del, add, reset);
2258 return;
2259 }
2260
2261 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2262 textconv_one = get_textconv(one);
2263 textconv_two = get_textconv(two);
2264 }
2265
2266 diff_set_mnemonic_prefix(o, "a/", "b/");
2267 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2268 a_prefix = o->b_prefix;
2269 b_prefix = o->a_prefix;
2270 } else {
2271 a_prefix = o->a_prefix;
2272 b_prefix = o->b_prefix;
2273 }
2274
2275 /* Never use a non-valid filename anywhere if at all possible */
2276 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2277 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2278
2279 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2280 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2281 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2282 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2283 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2284 if (lbl[0][0] == '/') {
2285 /* /dev/null */
2286 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2287 if (xfrm_msg)
2288 strbuf_addstr(&header, xfrm_msg);
2289 must_show_header = 1;
2290 }
2291 else if (lbl[1][0] == '/') {
2292 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2293 if (xfrm_msg)
2294 strbuf_addstr(&header, xfrm_msg);
2295 must_show_header = 1;
2296 }
2297 else {
2298 if (one->mode != two->mode) {
2299 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2300 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2301 must_show_header = 1;
2302 }
2303 if (xfrm_msg)
2304 strbuf_addstr(&header, xfrm_msg);
2305
2306 /*
2307 * we do not run diff between different kind
2308 * of objects.
2309 */
2310 if ((one->mode ^ two->mode) & S_IFMT)
2311 goto free_ab_and_return;
2312 if (complete_rewrite &&
2313 (textconv_one || !diff_filespec_is_binary(one)) &&
2314 (textconv_two || !diff_filespec_is_binary(two))) {
2315 fprintf(o->file, "%s", header.buf);
2316 strbuf_reset(&header);
2317 emit_rewrite_diff(name_a, name_b, one, two,
2318 textconv_one, textconv_two, o);
2319 o->found_changes = 1;
2320 goto free_ab_and_return;
2321 }
2322 }
2323
2324 if (o->irreversible_delete && lbl[1][0] == '/') {
2325 fprintf(o->file, "%s", header.buf);
2326 strbuf_reset(&header);
2327 goto free_ab_and_return;
2328 } else if (!DIFF_OPT_TST(o, TEXT) &&
2329 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2330 (!textconv_two && diff_filespec_is_binary(two)) )) {
2331 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2332 die("unable to read files to diff");
2333 /* Quite common confusing case */
2334 if (mf1.size == mf2.size &&
2335 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2336 if (must_show_header)
2337 fprintf(o->file, "%s", header.buf);
2338 goto free_ab_and_return;
2339 }
2340 fprintf(o->file, "%s", header.buf);
2341 strbuf_reset(&header);
2342 if (DIFF_OPT_TST(o, BINARY))
2343 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2344 else
2345 fprintf(o->file, "%sBinary files %s and %s differ\n",
2346 line_prefix, lbl[0], lbl[1]);
2347 o->found_changes = 1;
2348 } else {
2349 /* Crazy xdl interfaces.. */
2350 const char *diffopts = getenv("GIT_DIFF_OPTS");
2351 xpparam_t xpp;
2352 xdemitconf_t xecfg;
2353 struct emit_callback ecbdata;
2354 const struct userdiff_funcname *pe;
2355
2356 if (must_show_header) {
2357 fprintf(o->file, "%s", header.buf);
2358 strbuf_reset(&header);
2359 }
2360
2361 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2362 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2363
2364 pe = diff_funcname_pattern(one);
2365 if (!pe)
2366 pe = diff_funcname_pattern(two);
2367
2368 memset(&xpp, 0, sizeof(xpp));
2369 memset(&xecfg, 0, sizeof(xecfg));
2370 memset(&ecbdata, 0, sizeof(ecbdata));
2371 ecbdata.label_path = lbl;
2372 ecbdata.color_diff = want_color(o->use_color);
2373 ecbdata.found_changesp = &o->found_changes;
2374 ecbdata.ws_rule = whitespace_rule(name_b);
2375 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2376 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2377 ecbdata.opt = o;
2378 ecbdata.header = header.len ? &header : NULL;
2379 xpp.flags = o->xdl_opts;
2380 xecfg.ctxlen = o->context;
2381 xecfg.interhunkctxlen = o->interhunkcontext;
2382 xecfg.flags = XDL_EMIT_FUNCNAMES;
2383 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2384 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2385 if (pe)
2386 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2387 if (!diffopts)
2388 ;
2389 else if (starts_with(diffopts, "--unified="))
2390 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2391 else if (starts_with(diffopts, "-u"))
2392 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2393 if (o->word_diff)
2394 init_diff_words_data(&ecbdata, o, one, two);
2395 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2396 &xpp, &xecfg);
2397 if (o->word_diff)
2398 free_diff_words_data(&ecbdata);
2399 if (textconv_one)
2400 free(mf1.ptr);
2401 if (textconv_two)
2402 free(mf2.ptr);
2403 xdiff_clear_find_func(&xecfg);
2404 }
2405
2406 free_ab_and_return:
2407 strbuf_release(&header);
2408 diff_free_filespec_data(one);
2409 diff_free_filespec_data(two);
2410 free(a_one);
2411 free(b_two);
2412 return;
2413 }
2414
2415 static void builtin_diffstat(const char *name_a, const char *name_b,
2416 struct diff_filespec *one,
2417 struct diff_filespec *two,
2418 struct diffstat_t *diffstat,
2419 struct diff_options *o,
2420 struct diff_filepair *p)
2421 {
2422 mmfile_t mf1, mf2;
2423 struct diffstat_file *data;
2424 int same_contents;
2425 int complete_rewrite = 0;
2426
2427 if (!DIFF_PAIR_UNMERGED(p)) {
2428 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2429 complete_rewrite = 1;
2430 }
2431
2432 data = diffstat_add(diffstat, name_a, name_b);
2433 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2434
2435 if (!one || !two) {
2436 data->is_unmerged = 1;
2437 return;
2438 }
2439
2440 same_contents = !hashcmp(one->sha1, two->sha1);
2441
2442 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2443 data->is_binary = 1;
2444 if (same_contents) {
2445 data->added = 0;
2446 data->deleted = 0;
2447 } else {
2448 data->added = diff_filespec_size(two);
2449 data->deleted = diff_filespec_size(one);
2450 }
2451 }
2452
2453 else if (complete_rewrite) {
2454 diff_populate_filespec(one, 0);
2455 diff_populate_filespec(two, 0);
2456 data->deleted = count_lines(one->data, one->size);
2457 data->added = count_lines(two->data, two->size);
2458 }
2459
2460 else if (!same_contents) {
2461 /* Crazy xdl interfaces.. */
2462 xpparam_t xpp;
2463 xdemitconf_t xecfg;
2464
2465 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2466 die("unable to read files to diff");
2467
2468 memset(&xpp, 0, sizeof(xpp));
2469 memset(&xecfg, 0, sizeof(xecfg));
2470 xpp.flags = o->xdl_opts;
2471 xecfg.ctxlen = o->context;
2472 xecfg.interhunkctxlen = o->interhunkcontext;
2473 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2474 &xpp, &xecfg);
2475 }
2476
2477 diff_free_filespec_data(one);
2478 diff_free_filespec_data(two);
2479 }
2480
2481 static void builtin_checkdiff(const char *name_a, const char *name_b,
2482 const char *attr_path,
2483 struct diff_filespec *one,
2484 struct diff_filespec *two,
2485 struct diff_options *o)
2486 {
2487 mmfile_t mf1, mf2;
2488 struct checkdiff_t data;
2489
2490 if (!two)
2491 return;
2492
2493 memset(&data, 0, sizeof(data));
2494 data.filename = name_b ? name_b : name_a;
2495 data.lineno = 0;
2496 data.o = o;
2497 data.ws_rule = whitespace_rule(attr_path);
2498 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2499
2500 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2501 die("unable to read files to diff");
2502
2503 /*
2504 * All the other codepaths check both sides, but not checking
2505 * the "old" side here is deliberate. We are checking the newly
2506 * introduced changes, and as long as the "new" side is text, we
2507 * can and should check what it introduces.
2508 */
2509 if (diff_filespec_is_binary(two))
2510 goto free_and_return;
2511 else {
2512 /* Crazy xdl interfaces.. */
2513 xpparam_t xpp;
2514 xdemitconf_t xecfg;
2515
2516 memset(&xpp, 0, sizeof(xpp));
2517 memset(&xecfg, 0, sizeof(xecfg));
2518 xecfg.ctxlen = 1; /* at least one context line */
2519 xpp.flags = 0;
2520 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2521 &xpp, &xecfg);
2522
2523 if (data.ws_rule & WS_BLANK_AT_EOF) {
2524 struct emit_callback ecbdata;
2525 int blank_at_eof;
2526
2527 ecbdata.ws_rule = data.ws_rule;
2528 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2529 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2530
2531 if (blank_at_eof) {
2532 static char *err;
2533 if (!err)
2534 err = whitespace_error_string(WS_BLANK_AT_EOF);
2535 fprintf(o->file, "%s:%d: %s.\n",
2536 data.filename, blank_at_eof, err);
2537 data.status = 1; /* report errors */
2538 }
2539 }
2540 }
2541 free_and_return:
2542 diff_free_filespec_data(one);
2543 diff_free_filespec_data(two);
2544 if (data.status)
2545 DIFF_OPT_SET(o, CHECK_FAILED);
2546 }
2547
2548 struct diff_filespec *alloc_filespec(const char *path)
2549 {
2550 int namelen = strlen(path);
2551 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2552
2553 memset(spec, 0, sizeof(*spec));
2554 spec->path = (char *)(spec + 1);
2555 memcpy(spec->path, path, namelen+1);
2556 spec->count = 1;
2557 spec->is_binary = -1;
2558 return spec;
2559 }
2560
2561 void free_filespec(struct diff_filespec *spec)
2562 {
2563 if (!--spec->count) {
2564 diff_free_filespec_data(spec);
2565 free(spec);
2566 }
2567 }
2568
2569 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2570 int sha1_valid, unsigned short mode)
2571 {
2572 if (mode) {
2573 spec->mode = canon_mode(mode);
2574 hashcpy(spec->sha1, sha1);
2575 spec->sha1_valid = sha1_valid;
2576 }
2577 }
2578
2579 /*
2580 * Given a name and sha1 pair, if the index tells us the file in
2581 * the work tree has that object contents, return true, so that
2582 * prepare_temp_file() does not have to inflate and extract.
2583 */
2584 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2585 {
2586 const struct cache_entry *ce;
2587 struct stat st;
2588 int pos, len;
2589
2590 /*
2591 * We do not read the cache ourselves here, because the
2592 * benchmark with my previous version that always reads cache
2593 * shows that it makes things worse for diff-tree comparing
2594 * two linux-2.6 kernel trees in an already checked out work
2595 * tree. This is because most diff-tree comparisons deal with
2596 * only a small number of files, while reading the cache is
2597 * expensive for a large project, and its cost outweighs the
2598 * savings we get by not inflating the object to a temporary
2599 * file. Practically, this code only helps when we are used
2600 * by diff-cache --cached, which does read the cache before
2601 * calling us.
2602 */
2603 if (!active_cache)
2604 return 0;
2605
2606 /* We want to avoid the working directory if our caller
2607 * doesn't need the data in a normal file, this system
2608 * is rather slow with its stat/open/mmap/close syscalls,
2609 * and the object is contained in a pack file. The pack
2610 * is probably already open and will be faster to obtain
2611 * the data through than the working directory. Loose
2612 * objects however would tend to be slower as they need
2613 * to be individually opened and inflated.
2614 */
2615 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2616 return 0;
2617
2618 len = strlen(name);
2619 pos = cache_name_pos(name, len);
2620 if (pos < 0)
2621 return 0;
2622 ce = active_cache[pos];
2623
2624 /*
2625 * This is not the sha1 we are looking for, or
2626 * unreusable because it is not a regular file.
2627 */
2628 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2629 return 0;
2630
2631 /*
2632 * If ce is marked as "assume unchanged", there is no
2633 * guarantee that work tree matches what we are looking for.
2634 */
2635 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2636 return 0;
2637
2638 /*
2639 * If ce matches the file in the work tree, we can reuse it.
2640 */
2641 if (ce_uptodate(ce) ||
2642 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2643 return 1;
2644
2645 return 0;
2646 }
2647
2648 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2649 {
2650 int len;
2651 char *data = xmalloc(100), *dirty = "";
2652
2653 /* Are we looking at the work tree? */
2654 if (s->dirty_submodule)
2655 dirty = "-dirty";
2656
2657 len = snprintf(data, 100,
2658 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2659 s->data = data;
2660 s->size = len;
2661 s->should_free = 1;
2662 if (size_only) {
2663 s->data = NULL;
2664 free(data);
2665 }
2666 return 0;
2667 }
2668
2669 /*
2670 * While doing rename detection and pickaxe operation, we may need to
2671 * grab the data for the blob (or file) for our own in-core comparison.
2672 * diff_filespec has data and size fields for this purpose.
2673 */
2674 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2675 {
2676 int err = 0;
2677 /*
2678 * demote FAIL to WARN to allow inspecting the situation
2679 * instead of refusing.
2680 */
2681 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2682 ? SAFE_CRLF_WARN
2683 : safe_crlf);
2684
2685 if (!DIFF_FILE_VALID(s))
2686 die("internal error: asking to populate invalid file.");
2687 if (S_ISDIR(s->mode))
2688 return -1;
2689
2690 if (s->data)
2691 return 0;
2692
2693 if (size_only && 0 < s->size)
2694 return 0;
2695
2696 if (S_ISGITLINK(s->mode))
2697 return diff_populate_gitlink(s, size_only);
2698
2699 if (!s->sha1_valid ||
2700 reuse_worktree_file(s->path, s->sha1, 0)) {
2701 struct strbuf buf = STRBUF_INIT;
2702 struct stat st;
2703 int fd;
2704
2705 if (lstat(s->path, &st) < 0) {
2706 if (errno == ENOENT) {
2707 err_empty:
2708 err = -1;
2709 empty:
2710 s->data = (char *)"";
2711 s->size = 0;
2712 return err;
2713 }
2714 }
2715 s->size = xsize_t(st.st_size);
2716 if (!s->size)
2717 goto empty;
2718 if (S_ISLNK(st.st_mode)) {
2719 struct strbuf sb = STRBUF_INIT;
2720
2721 if (strbuf_readlink(&sb, s->path, s->size))
2722 goto err_empty;
2723 s->size = sb.len;
2724 s->data = strbuf_detach(&sb, NULL);
2725 s->should_free = 1;
2726 return 0;
2727 }
2728 if (size_only)
2729 return 0;
2730 fd = open(s->path, O_RDONLY);
2731 if (fd < 0)
2732 goto err_empty;
2733 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2734 close(fd);
2735 s->should_munmap = 1;
2736
2737 /*
2738 * Convert from working tree format to canonical git format
2739 */
2740 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2741 size_t size = 0;
2742 munmap(s->data, s->size);
2743 s->should_munmap = 0;
2744 s->data = strbuf_detach(&buf, &size);
2745 s->size = size;
2746 s->should_free = 1;
2747 }
2748 }
2749 else {
2750 enum object_type type;
2751 if (size_only) {
2752 type = sha1_object_info(s->sha1, &s->size);
2753 if (type < 0)
2754 die("unable to read %s", sha1_to_hex(s->sha1));
2755 } else {
2756 s->data = read_sha1_file(s->sha1, &type, &s->size);
2757 if (!s->data)
2758 die("unable to read %s", sha1_to_hex(s->sha1));
2759 s->should_free = 1;
2760 }
2761 }
2762 return 0;
2763 }
2764
2765 void diff_free_filespec_blob(struct diff_filespec *s)
2766 {
2767 if (s->should_free)
2768 free(s->data);
2769 else if (s->should_munmap)
2770 munmap(s->data, s->size);
2771
2772 if (s->should_free || s->should_munmap) {
2773 s->should_free = s->should_munmap = 0;
2774 s->data = NULL;
2775 }
2776 }
2777
2778 void diff_free_filespec_data(struct diff_filespec *s)
2779 {
2780 diff_free_filespec_blob(s);
2781 free(s->cnt_data);
2782 s->cnt_data = NULL;
2783 }
2784
2785 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2786 void *blob,
2787 unsigned long size,
2788 const unsigned char *sha1,
2789 int mode)
2790 {
2791 int fd;
2792 struct strbuf buf = STRBUF_INIT;
2793 struct strbuf template = STRBUF_INIT;
2794 char *path_dup = xstrdup(path);
2795 const char *base = basename(path_dup);
2796
2797 /* Generate "XXXXXX_basename.ext" */
2798 strbuf_addstr(&template, "XXXXXX_");
2799 strbuf_addstr(&template, base);
2800
2801 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2802 strlen(base) + 1);
2803 if (fd < 0)
2804 die_errno("unable to create temp-file");
2805 if (convert_to_working_tree(path,
2806 (const char *)blob, (size_t)size, &buf)) {
2807 blob = buf.buf;
2808 size = buf.len;
2809 }
2810 if (write_in_full(fd, blob, size) != size)
2811 die_errno("unable to write temp-file");
2812 close(fd);
2813 temp->name = temp->tmp_path;
2814 strcpy(temp->hex, sha1_to_hex(sha1));
2815 temp->hex[40] = 0;
2816 sprintf(temp->mode, "%06o", mode);
2817 strbuf_release(&buf);
2818 strbuf_release(&template);
2819 free(path_dup);
2820 }
2821
2822 static struct diff_tempfile *prepare_temp_file(const char *name,
2823 struct diff_filespec *one)
2824 {
2825 struct diff_tempfile *temp = claim_diff_tempfile();
2826
2827 if (!DIFF_FILE_VALID(one)) {
2828 not_a_valid_file:
2829 /* A '-' entry produces this for file-2, and
2830 * a '+' entry produces this for file-1.
2831 */
2832 temp->name = "/dev/null";
2833 strcpy(temp->hex, ".");
2834 strcpy(temp->mode, ".");
2835 return temp;
2836 }
2837
2838 if (!remove_tempfile_installed) {
2839 atexit(remove_tempfile);
2840 sigchain_push_common(remove_tempfile_on_signal);
2841 remove_tempfile_installed = 1;
2842 }
2843
2844 if (!S_ISGITLINK(one->mode) &&
2845 (!one->sha1_valid ||
2846 reuse_worktree_file(name, one->sha1, 1))) {
2847 struct stat st;
2848 if (lstat(name, &st) < 0) {
2849 if (errno == ENOENT)
2850 goto not_a_valid_file;
2851 die_errno("stat(%s)", name);
2852 }
2853 if (S_ISLNK(st.st_mode)) {
2854 struct strbuf sb = STRBUF_INIT;
2855 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2856 die_errno("readlink(%s)", name);
2857 prep_temp_blob(name, temp, sb.buf, sb.len,
2858 (one->sha1_valid ?
2859 one->sha1 : null_sha1),
2860 (one->sha1_valid ?
2861 one->mode : S_IFLNK));
2862 strbuf_release(&sb);
2863 }
2864 else {
2865 /* we can borrow from the file in the work tree */
2866 temp->name = name;
2867 if (!one->sha1_valid)
2868 strcpy(temp->hex, sha1_to_hex(null_sha1));
2869 else
2870 strcpy(temp->hex, sha1_to_hex(one->sha1));
2871 /* Even though we may sometimes borrow the
2872 * contents from the work tree, we always want
2873 * one->mode. mode is trustworthy even when
2874 * !(one->sha1_valid), as long as
2875 * DIFF_FILE_VALID(one).
2876 */
2877 sprintf(temp->mode, "%06o", one->mode);
2878 }
2879 return temp;
2880 }
2881 else {
2882 if (diff_populate_filespec(one, 0))
2883 die("cannot read data blob for %s", one->path);
2884 prep_temp_blob(name, temp, one->data, one->size,
2885 one->sha1, one->mode);
2886 }
2887 return temp;
2888 }
2889
2890 /* An external diff command takes:
2891 *
2892 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2893 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2894 *
2895 */
2896 static void run_external_diff(const char *pgm,
2897 const char *name,
2898 const char *other,
2899 struct diff_filespec *one,
2900 struct diff_filespec *two,
2901 const char *xfrm_msg,
2902 int complete_rewrite,
2903 struct diff_options *o)
2904 {
2905 const char *spawn_arg[10];
2906 int retval;
2907 const char **arg = &spawn_arg[0];
2908 struct diff_queue_struct *q = &diff_queued_diff;
2909 const char *env[3] = { NULL };
2910 char env_counter[50];
2911 char env_total[50];
2912
2913 if (one && two) {
2914 struct diff_tempfile *temp_one, *temp_two;
2915 const char *othername = (other ? other : name);
2916 temp_one = prepare_temp_file(name, one);
2917 temp_two = prepare_temp_file(othername, two);
2918 *arg++ = pgm;
2919 *arg++ = name;
2920 *arg++ = temp_one->name;
2921 *arg++ = temp_one->hex;
2922 *arg++ = temp_one->mode;
2923 *arg++ = temp_two->name;
2924 *arg++ = temp_two->hex;
2925 *arg++ = temp_two->mode;
2926 if (other) {
2927 *arg++ = other;
2928 *arg++ = xfrm_msg;
2929 }
2930 } else {
2931 *arg++ = pgm;
2932 *arg++ = name;
2933 }
2934 *arg = NULL;
2935 fflush(NULL);
2936
2937 env[0] = env_counter;
2938 snprintf(env_counter, sizeof(env_counter), "GIT_DIFF_PATH_COUNTER=%d",
2939 ++o->diff_path_counter);
2940 env[1] = env_total;
2941 snprintf(env_total, sizeof(env_total), "GIT_DIFF_PATH_TOTAL=%d", q->nr);
2942
2943 retval = run_command_v_opt_cd_env(spawn_arg, RUN_USING_SHELL, NULL, env);
2944 remove_tempfile();
2945 if (retval) {
2946 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2947 exit(1);
2948 }
2949 }
2950
2951 static int similarity_index(struct diff_filepair *p)
2952 {
2953 return p->score * 100 / MAX_SCORE;
2954 }
2955
2956 static void fill_metainfo(struct strbuf *msg,
2957 const char *name,
2958 const char *other,
2959 struct diff_filespec *one,
2960 struct diff_filespec *two,
2961 struct diff_options *o,
2962 struct diff_filepair *p,
2963 int *must_show_header,
2964 int use_color)
2965 {
2966 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2967 const char *reset = diff_get_color(use_color, DIFF_RESET);
2968 const char *line_prefix = diff_line_prefix(o);
2969
2970 *must_show_header = 1;
2971 strbuf_init(msg, PATH_MAX * 2 + 300);
2972 switch (p->status) {
2973 case DIFF_STATUS_COPIED:
2974 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2975 line_prefix, set, similarity_index(p));
2976 strbuf_addf(msg, "%s\n%s%scopy from ",
2977 reset, line_prefix, set);
2978 quote_c_style(name, msg, NULL, 0);
2979 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2980 quote_c_style(other, msg, NULL, 0);
2981 strbuf_addf(msg, "%s\n", reset);
2982 break;
2983 case DIFF_STATUS_RENAMED:
2984 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2985 line_prefix, set, similarity_index(p));
2986 strbuf_addf(msg, "%s\n%s%srename from ",
2987 reset, line_prefix, set);
2988 quote_c_style(name, msg, NULL, 0);
2989 strbuf_addf(msg, "%s\n%s%srename to ",
2990 reset, line_prefix, set);
2991 quote_c_style(other, msg, NULL, 0);
2992 strbuf_addf(msg, "%s\n", reset);
2993 break;
2994 case DIFF_STATUS_MODIFIED:
2995 if (p->score) {
2996 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2997 line_prefix,
2998 set, similarity_index(p), reset);
2999 break;
3000 }
3001 /* fallthru */
3002 default:
3003 *must_show_header = 0;
3004 }
3005 if (one && two && hashcmp(one->sha1, two->sha1)) {
3006 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3007
3008 if (DIFF_OPT_TST(o, BINARY)) {
3009 mmfile_t mf;
3010 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3011 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3012 abbrev = 40;
3013 }
3014 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3015 find_unique_abbrev(one->sha1, abbrev));
3016 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3017 if (one->mode == two->mode)
3018 strbuf_addf(msg, " %06o", one->mode);
3019 strbuf_addf(msg, "%s\n", reset);
3020 }
3021 }
3022
3023 static void run_diff_cmd(const char *pgm,
3024 const char *name,
3025 const char *other,
3026 const char *attr_path,
3027 struct diff_filespec *one,
3028 struct diff_filespec *two,
3029 struct strbuf *msg,
3030 struct diff_options *o,
3031 struct diff_filepair *p)
3032 {
3033 const char *xfrm_msg = NULL;
3034 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3035 int must_show_header = 0;
3036
3037
3038 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3039 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3040 if (drv && drv->external)
3041 pgm = drv->external;
3042 }
3043
3044 if (msg) {
3045 /*
3046 * don't use colors when the header is intended for an
3047 * external diff driver
3048 */
3049 fill_metainfo(msg, name, other, one, two, o, p,
3050 &must_show_header,
3051 want_color(o->use_color) && !pgm);
3052 xfrm_msg = msg->len ? msg->buf : NULL;
3053 }
3054
3055 if (pgm) {
3056 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3057 complete_rewrite, o);
3058 return;
3059 }
3060 if (one && two)
3061 builtin_diff(name, other ? other : name,
3062 one, two, xfrm_msg, must_show_header,
3063 o, complete_rewrite);
3064 else
3065 fprintf(o->file, "* Unmerged path %s\n", name);
3066 }
3067
3068 static void diff_fill_sha1_info(struct diff_filespec *one)
3069 {
3070 if (DIFF_FILE_VALID(one)) {
3071 if (!one->sha1_valid) {
3072 struct stat st;
3073 if (one->is_stdin) {
3074 hashcpy(one->sha1, null_sha1);
3075 return;
3076 }
3077 if (lstat(one->path, &st) < 0)
3078 die_errno("stat '%s'", one->path);
3079 if (index_path(one->sha1, one->path, &st, 0))
3080 die("cannot hash %s", one->path);
3081 }
3082 }
3083 else
3084 hashclr(one->sha1);
3085 }
3086
3087 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3088 {
3089 /* Strip the prefix but do not molest /dev/null and absolute paths */
3090 if (*namep && **namep != '/') {
3091 *namep += prefix_length;
3092 if (**namep == '/')
3093 ++*namep;
3094 }
3095 if (*otherp && **otherp != '/') {
3096 *otherp += prefix_length;
3097 if (**otherp == '/')
3098 ++*otherp;
3099 }
3100 }
3101
3102 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3103 {
3104 const char *pgm = external_diff();
3105 struct strbuf msg;
3106 struct diff_filespec *one = p->one;
3107 struct diff_filespec *two = p->two;
3108 const char *name;
3109 const char *other;
3110 const char *attr_path;
3111
3112 name = p->one->path;
3113 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3114 attr_path = name;
3115 if (o->prefix_length)
3116 strip_prefix(o->prefix_length, &name, &other);
3117
3118 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3119 pgm = NULL;
3120
3121 if (DIFF_PAIR_UNMERGED(p)) {
3122 run_diff_cmd(pgm, name, NULL, attr_path,
3123 NULL, NULL, NULL, o, p);
3124 return;
3125 }
3126
3127 diff_fill_sha1_info(one);
3128 diff_fill_sha1_info(two);
3129
3130 if (!pgm &&
3131 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3132 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3133 /*
3134 * a filepair that changes between file and symlink
3135 * needs to be split into deletion and creation.
3136 */
3137 struct diff_filespec *null = alloc_filespec(two->path);
3138 run_diff_cmd(NULL, name, other, attr_path,
3139 one, null, &msg, o, p);
3140 free(null);
3141 strbuf_release(&msg);
3142
3143 null = alloc_filespec(one->path);
3144 run_diff_cmd(NULL, name, other, attr_path,
3145 null, two, &msg, o, p);
3146 free(null);
3147 }
3148 else
3149 run_diff_cmd(pgm, name, other, attr_path,
3150 one, two, &msg, o, p);
3151
3152 strbuf_release(&msg);
3153 }
3154
3155 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3156 struct diffstat_t *diffstat)
3157 {
3158 const char *name;
3159 const char *other;
3160
3161 if (DIFF_PAIR_UNMERGED(p)) {
3162 /* unmerged */
3163 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3164 return;
3165 }
3166
3167 name = p->one->path;
3168 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3169
3170 if (o->prefix_length)
3171 strip_prefix(o->prefix_length, &name, &other);
3172
3173 diff_fill_sha1_info(p->one);
3174 diff_fill_sha1_info(p->two);
3175
3176 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3177 }
3178
3179 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3180 {
3181 const char *name;
3182 const char *other;
3183 const char *attr_path;
3184
3185 if (DIFF_PAIR_UNMERGED(p)) {
3186 /* unmerged */
3187 return;
3188 }
3189
3190 name = p->one->path;
3191 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3192 attr_path = other ? other : name;
3193
3194 if (o->prefix_length)
3195 strip_prefix(o->prefix_length, &name, &other);
3196
3197 diff_fill_sha1_info(p->one);
3198 diff_fill_sha1_info(p->two);
3199
3200 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3201 }
3202
3203 void diff_setup(struct diff_options *options)
3204 {
3205 memcpy(options, &default_diff_options, sizeof(*options));
3206
3207 options->file = stdout;
3208
3209 options->line_termination = '\n';
3210 options->break_opt = -1;
3211 options->rename_limit = -1;
3212 options->dirstat_permille = diff_dirstat_permille_default;
3213 options->context = diff_context_default;
3214 DIFF_OPT_SET(options, RENAME_EMPTY);
3215
3216 options->change = diff_change;
3217 options->add_remove = diff_addremove;
3218 options->use_color = diff_use_color_default;
3219 options->detect_rename = diff_detect_rename_default;
3220 options->xdl_opts |= diff_algorithm;
3221
3222 options->orderfile = diff_order_file_cfg;
3223
3224 if (diff_no_prefix) {
3225 options->a_prefix = options->b_prefix = "";
3226 } else if (!diff_mnemonic_prefix) {
3227 options->a_prefix = "a/";
3228 options->b_prefix = "b/";
3229 }
3230 }
3231
3232 void diff_setup_done(struct diff_options *options)
3233 {
3234 int count = 0;
3235
3236 if (options->set_default)
3237 options->set_default(options);
3238
3239 if (options->output_format & DIFF_FORMAT_NAME)
3240 count++;
3241 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3242 count++;
3243 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3244 count++;
3245 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3246 count++;
3247 if (count > 1)
3248 die("--name-only, --name-status, --check and -s are mutually exclusive");
3249
3250 /*
3251 * Most of the time we can say "there are changes"
3252 * only by checking if there are changed paths, but
3253 * --ignore-whitespace* options force us to look
3254 * inside contents.
3255 */
3256
3257 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3258 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3259 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3260 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3261 else
3262 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3263
3264 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3265 options->detect_rename = DIFF_DETECT_COPY;
3266
3267 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3268 options->prefix = NULL;
3269 if (options->prefix)
3270 options->prefix_length = strlen(options->prefix);
3271 else
3272 options->prefix_length = 0;
3273
3274 if (options->output_format & (DIFF_FORMAT_NAME |
3275 DIFF_FORMAT_NAME_STATUS |
3276 DIFF_FORMAT_CHECKDIFF |
3277 DIFF_FORMAT_NO_OUTPUT))
3278 options->output_format &= ~(DIFF_FORMAT_RAW |
3279 DIFF_FORMAT_NUMSTAT |
3280 DIFF_FORMAT_DIFFSTAT |
3281 DIFF_FORMAT_SHORTSTAT |
3282 DIFF_FORMAT_DIRSTAT |
3283 DIFF_FORMAT_SUMMARY |
3284 DIFF_FORMAT_PATCH);
3285
3286 /*
3287 * These cases always need recursive; we do not drop caller-supplied
3288 * recursive bits for other formats here.
3289 */
3290 if (options->output_format & (DIFF_FORMAT_PATCH |
3291 DIFF_FORMAT_NUMSTAT |
3292 DIFF_FORMAT_DIFFSTAT |
3293 DIFF_FORMAT_SHORTSTAT |
3294 DIFF_FORMAT_DIRSTAT |
3295 DIFF_FORMAT_SUMMARY |
3296 DIFF_FORMAT_CHECKDIFF))
3297 DIFF_OPT_SET(options, RECURSIVE);
3298 /*
3299 * Also pickaxe would not work very well if you do not say recursive
3300 */
3301 if (options->pickaxe)
3302 DIFF_OPT_SET(options, RECURSIVE);
3303 /*
3304 * When patches are generated, submodules diffed against the work tree
3305 * must be checked for dirtiness too so it can be shown in the output
3306 */
3307 if (options->output_format & DIFF_FORMAT_PATCH)
3308 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3309
3310 if (options->detect_rename && options->rename_limit < 0)
3311 options->rename_limit = diff_rename_limit_default;
3312 if (options->setup & DIFF_SETUP_USE_CACHE) {
3313 if (!active_cache)
3314 /* read-cache does not die even when it fails
3315 * so it is safe for us to do this here. Also
3316 * it does not smudge active_cache or active_nr
3317 * when it fails, so we do not have to worry about
3318 * cleaning it up ourselves either.
3319 */
3320 read_cache();
3321 }
3322 if (options->abbrev <= 0 || 40 < options->abbrev)
3323 options->abbrev = 40; /* full */
3324
3325 /*
3326 * It does not make sense to show the first hit we happened
3327 * to have found. It does not make sense not to return with
3328 * exit code in such a case either.
3329 */
3330 if (DIFF_OPT_TST(options, QUICK)) {
3331 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3332 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3333 }
3334
3335 options->diff_path_counter = 0;
3336 }
3337
3338 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3339 {
3340 char c, *eq;
3341 int len;
3342
3343 if (*arg != '-')
3344 return 0;
3345 c = *++arg;
3346 if (!c)
3347 return 0;
3348 if (c == arg_short) {
3349 c = *++arg;
3350 if (!c)
3351 return 1;
3352 if (val && isdigit(c)) {
3353 char *end;
3354 int n = strtoul(arg, &end, 10);
3355 if (*end)
3356 return 0;
3357 *val = n;
3358 return 1;
3359 }
3360 return 0;
3361 }
3362 if (c != '-')
3363 return 0;
3364 arg++;
3365 eq = strchrnul(arg, '=');
3366 len = eq - arg;
3367 if (!len || strncmp(arg, arg_long, len))
3368 return 0;
3369 if (*eq) {
3370 int n;
3371 char *end;
3372 if (!isdigit(*++eq))
3373 return 0;
3374 n = strtoul(eq, &end, 10);
3375 if (*end)
3376 return 0;
3377 *val = n;
3378 }
3379 return 1;
3380 }
3381
3382 static int diff_scoreopt_parse(const char *opt);
3383
3384 static inline int short_opt(char opt, const char **argv,
3385 const char **optarg)
3386 {
3387 const char *arg = argv[0];
3388 if (arg[0] != '-' || arg[1] != opt)
3389 return 0;
3390 if (arg[2] != '\0') {
3391 *optarg = arg + 2;
3392 return 1;
3393 }
3394 if (!argv[1])
3395 die("Option '%c' requires a value", opt);
3396 *optarg = argv[1];
3397 return 2;
3398 }
3399
3400 int parse_long_opt(const char *opt, const char **argv,
3401 const char **optarg)
3402 {
3403 const char *arg = argv[0];
3404 if (arg[0] != '-' || arg[1] != '-')
3405 return 0;
3406 arg += strlen("--");
3407 if (!starts_with(arg, opt))
3408 return 0;
3409 arg += strlen(opt);
3410 if (*arg == '=') { /* stuck form: --option=value */
3411 *optarg = arg + 1;
3412 return 1;
3413 }
3414 if (*arg != '\0')
3415 return 0;
3416 /* separate form: --option value */
3417 if (!argv[1])
3418 die("Option '--%s' requires a value", opt);
3419 *optarg = argv[1];
3420 return 2;
3421 }
3422
3423 static int stat_opt(struct diff_options *options, const char **av)
3424 {
3425 const char *arg = av[0];
3426 char *end;
3427 int width = options->stat_width;
3428 int name_width = options->stat_name_width;
3429 int graph_width = options->stat_graph_width;
3430 int count = options->stat_count;
3431 int argcount = 1;
3432
3433 arg += strlen("--stat");
3434 end = (char *)arg;
3435
3436 switch (*arg) {
3437 case '-':
3438 if (starts_with(arg, "-width")) {
3439 arg += strlen("-width");
3440 if (*arg == '=')
3441 width = strtoul(arg + 1, &end, 10);
3442 else if (!*arg && !av[1])
3443 die("Option '--stat-width' requires a value");
3444 else if (!*arg) {
3445 width = strtoul(av[1], &end, 10);
3446 argcount = 2;
3447 }
3448 } else if (starts_with(arg, "-name-width")) {
3449 arg += strlen("-name-width");
3450 if (*arg == '=')
3451 name_width = strtoul(arg + 1, &end, 10);
3452 else if (!*arg && !av[1])
3453 die("Option '--stat-name-width' requires a value");
3454 else if (!*arg) {
3455 name_width = strtoul(av[1], &end, 10);
3456 argcount = 2;
3457 }
3458 } else if (starts_with(arg, "-graph-width")) {
3459 arg += strlen("-graph-width");
3460 if (*arg == '=')
3461 graph_width = strtoul(arg + 1, &end, 10);
3462 else if (!*arg && !av[1])
3463 die("Option '--stat-graph-width' requires a value");
3464 else if (!*arg) {
3465 graph_width = strtoul(av[1], &end, 10);
3466 argcount = 2;
3467 }
3468 } else if (starts_with(arg, "-count")) {
3469 arg += strlen("-count");
3470 if (*arg == '=')
3471 count = strtoul(arg + 1, &end, 10);
3472 else if (!*arg && !av[1])
3473 die("Option '--stat-count' requires a value");
3474 else if (!*arg) {
3475 count = strtoul(av[1], &end, 10);
3476 argcount = 2;
3477 }
3478 }
3479 break;
3480 case '=':
3481 width = strtoul(arg+1, &end, 10);
3482 if (*end == ',')
3483 name_width = strtoul(end+1, &end, 10);
3484 if (*end == ',')
3485 count = strtoul(end+1, &end, 10);
3486 }
3487
3488 /* Important! This checks all the error cases! */
3489 if (*end)
3490 return 0;
3491 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3492 options->stat_name_width = name_width;
3493 options->stat_graph_width = graph_width;
3494 options->stat_width = width;
3495 options->stat_count = count;
3496 return argcount;
3497 }
3498
3499 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3500 {
3501 struct strbuf errmsg = STRBUF_INIT;
3502 if (parse_dirstat_params(options, params, &errmsg))
3503 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3504 errmsg.buf);
3505 strbuf_release(&errmsg);
3506 /*
3507 * The caller knows a dirstat-related option is given from the command
3508 * line; allow it to say "return this_function();"
3509 */
3510 options->output_format |= DIFF_FORMAT_DIRSTAT;
3511 return 1;
3512 }
3513
3514 static int parse_submodule_opt(struct diff_options *options, const char *value)
3515 {
3516 if (parse_submodule_params(options, value))
3517 die(_("Failed to parse --submodule option parameter: '%s'"),
3518 value);
3519 return 1;
3520 }
3521
3522 static const char diff_status_letters[] = {
3523 DIFF_STATUS_ADDED,
3524 DIFF_STATUS_COPIED,
3525 DIFF_STATUS_DELETED,
3526 DIFF_STATUS_MODIFIED,
3527 DIFF_STATUS_RENAMED,
3528 DIFF_STATUS_TYPE_CHANGED,
3529 DIFF_STATUS_UNKNOWN,
3530 DIFF_STATUS_UNMERGED,
3531 DIFF_STATUS_FILTER_AON,
3532 DIFF_STATUS_FILTER_BROKEN,
3533 '\0',
3534 };
3535
3536 static unsigned int filter_bit['Z' + 1];
3537
3538 static void prepare_filter_bits(void)
3539 {
3540 int i;
3541
3542 if (!filter_bit[DIFF_STATUS_ADDED]) {
3543 for (i = 0; diff_status_letters[i]; i++)
3544 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3545 }
3546 }
3547
3548 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3549 {
3550 return opt->filter & filter_bit[(int) status];
3551 }
3552
3553 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3554 {
3555 int i, optch;
3556
3557 prepare_filter_bits();
3558
3559 /*
3560 * If there is a negation e.g. 'd' in the input, and we haven't
3561 * initialized the filter field with another --diff-filter, start
3562 * from full set of bits, except for AON.
3563 */
3564 if (!opt->filter) {
3565 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3566 if (optch < 'a' || 'z' < optch)
3567 continue;
3568 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3569 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3570 break;
3571 }
3572 }
3573
3574 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3575 unsigned int bit;
3576 int negate;
3577
3578 if ('a' <= optch && optch <= 'z') {
3579 negate = 1;
3580 optch = toupper(optch);
3581 } else {
3582 negate = 0;
3583 }
3584
3585 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3586 if (!bit)
3587 return optarg[i];
3588 if (negate)
3589 opt->filter &= ~bit;
3590 else
3591 opt->filter |= bit;
3592 }
3593 return 0;
3594 }
3595
3596 static void enable_patch_output(int *fmt) {
3597 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3598 *fmt |= DIFF_FORMAT_PATCH;
3599 }
3600
3601 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3602 {
3603 const char *arg = av[0];
3604 const char *optarg;
3605 int argcount;
3606
3607 /* Output format options */
3608 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3609 || opt_arg(arg, 'U', "unified", &options->context))
3610 enable_patch_output(&options->output_format);
3611 else if (!strcmp(arg, "--raw"))
3612 options->output_format |= DIFF_FORMAT_RAW;
3613 else if (!strcmp(arg, "--patch-with-raw")) {
3614 enable_patch_output(&options->output_format);
3615 options->output_format |= DIFF_FORMAT_RAW;
3616 } else if (!strcmp(arg, "--numstat"))
3617 options->output_format |= DIFF_FORMAT_NUMSTAT;
3618 else if (!strcmp(arg, "--shortstat"))
3619 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3620 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3621 return parse_dirstat_opt(options, "");
3622 else if (starts_with(arg, "-X"))
3623 return parse_dirstat_opt(options, arg + 2);
3624 else if (starts_with(arg, "--dirstat="))
3625 return parse_dirstat_opt(options, arg + 10);
3626 else if (!strcmp(arg, "--cumulative"))
3627 return parse_dirstat_opt(options, "cumulative");
3628 else if (!strcmp(arg, "--dirstat-by-file"))
3629 return parse_dirstat_opt(options, "files");
3630 else if (starts_with(arg, "--dirstat-by-file=")) {
3631 parse_dirstat_opt(options, "files");
3632 return parse_dirstat_opt(options, arg + 18);
3633 }
3634 else if (!strcmp(arg, "--check"))
3635 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3636 else if (!strcmp(arg, "--summary"))
3637 options->output_format |= DIFF_FORMAT_SUMMARY;
3638 else if (!strcmp(arg, "--patch-with-stat")) {
3639 enable_patch_output(&options->output_format);
3640 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3641 } else if (!strcmp(arg, "--name-only"))
3642 options->output_format |= DIFF_FORMAT_NAME;
3643 else if (!strcmp(arg, "--name-status"))
3644 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3645 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3646 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3647 else if (starts_with(arg, "--stat"))
3648 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3649 return stat_opt(options, av);
3650
3651 /* renames options */
3652 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3653 !strcmp(arg, "--break-rewrites")) {
3654 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3655 return error("invalid argument to -B: %s", arg+2);
3656 }
3657 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3658 !strcmp(arg, "--find-renames")) {
3659 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3660 return error("invalid argument to -M: %s", arg+2);
3661 options->detect_rename = DIFF_DETECT_RENAME;
3662 }
3663 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3664 options->irreversible_delete = 1;
3665 }
3666 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3667 !strcmp(arg, "--find-copies")) {
3668 if (options->detect_rename == DIFF_DETECT_COPY)
3669 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3670 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3671 return error("invalid argument to -C: %s", arg+2);
3672 options->detect_rename = DIFF_DETECT_COPY;
3673 }
3674 else if (!strcmp(arg, "--no-renames"))
3675 options->detect_rename = 0;
3676 else if (!strcmp(arg, "--rename-empty"))
3677 DIFF_OPT_SET(options, RENAME_EMPTY);
3678 else if (!strcmp(arg, "--no-rename-empty"))
3679 DIFF_OPT_CLR(options, RENAME_EMPTY);
3680 else if (!strcmp(arg, "--relative"))
3681 DIFF_OPT_SET(options, RELATIVE_NAME);
3682 else if (starts_with(arg, "--relative=")) {
3683 DIFF_OPT_SET(options, RELATIVE_NAME);
3684 options->prefix = arg + 11;
3685 }
3686
3687 /* xdiff options */
3688 else if (!strcmp(arg, "--minimal"))
3689 DIFF_XDL_SET(options, NEED_MINIMAL);
3690 else if (!strcmp(arg, "--no-minimal"))
3691 DIFF_XDL_CLR(options, NEED_MINIMAL);
3692 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3693 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3694 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3695 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3696 else if (!strcmp(arg, "--ignore-space-at-eol"))
3697 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3698 else if (!strcmp(arg, "--ignore-blank-lines"))
3699 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3700 else if (!strcmp(arg, "--patience"))
3701 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3702 else if (!strcmp(arg, "--histogram"))
3703 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3704 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3705 long value = parse_algorithm_value(optarg);
3706 if (value < 0)
3707 return error("option diff-algorithm accepts \"myers\", "
3708 "\"minimal\", \"patience\" and \"histogram\"");
3709 /* clear out previous settings */
3710 DIFF_XDL_CLR(options, NEED_MINIMAL);
3711 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3712 options->xdl_opts |= value;
3713 return argcount;
3714 }
3715
3716 /* flags options */
3717 else if (!strcmp(arg, "--binary")) {
3718 enable_patch_output(&options->output_format);
3719 DIFF_OPT_SET(options, BINARY);
3720 }
3721 else if (!strcmp(arg, "--full-index"))
3722 DIFF_OPT_SET(options, FULL_INDEX);
3723 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3724 DIFF_OPT_SET(options, TEXT);
3725 else if (!strcmp(arg, "-R"))
3726 DIFF_OPT_SET(options, REVERSE_DIFF);
3727 else if (!strcmp(arg, "--find-copies-harder"))
3728 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3729 else if (!strcmp(arg, "--follow"))
3730 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3731 else if (!strcmp(arg, "--no-follow"))
3732 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3733 else if (!strcmp(arg, "--color"))
3734 options->use_color = 1;
3735 else if (starts_with(arg, "--color=")) {
3736 int value = git_config_colorbool(NULL, arg+8);
3737 if (value < 0)
3738 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3739 options->use_color = value;
3740 }
3741 else if (!strcmp(arg, "--no-color"))
3742 options->use_color = 0;
3743 else if (!strcmp(arg, "--color-words")) {
3744 options->use_color = 1;
3745 options->word_diff = DIFF_WORDS_COLOR;
3746 }
3747 else if (starts_with(arg, "--color-words=")) {
3748 options->use_color = 1;
3749 options->word_diff = DIFF_WORDS_COLOR;
3750 options->word_regex = arg + 14;
3751 }
3752 else if (!strcmp(arg, "--word-diff")) {
3753 if (options->word_diff == DIFF_WORDS_NONE)
3754 options->word_diff = DIFF_WORDS_PLAIN;
3755 }
3756 else if (starts_with(arg, "--word-diff=")) {
3757 const char *type = arg + 12;
3758 if (!strcmp(type, "plain"))
3759 options->word_diff = DIFF_WORDS_PLAIN;
3760 else if (!strcmp(type, "color")) {
3761 options->use_color = 1;
3762 options->word_diff = DIFF_WORDS_COLOR;
3763 }
3764 else if (!strcmp(type, "porcelain"))
3765 options->word_diff = DIFF_WORDS_PORCELAIN;
3766 else if (!strcmp(type, "none"))
3767 options->word_diff = DIFF_WORDS_NONE;
3768 else
3769 die("bad --word-diff argument: %s", type);
3770 }
3771 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3772 if (options->word_diff == DIFF_WORDS_NONE)
3773 options->word_diff = DIFF_WORDS_PLAIN;
3774 options->word_regex = optarg;
3775 return argcount;
3776 }
3777 else if (!strcmp(arg, "--exit-code"))
3778 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3779 else if (!strcmp(arg, "--quiet"))
3780 DIFF_OPT_SET(options, QUICK);
3781 else if (!strcmp(arg, "--ext-diff"))
3782 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3783 else if (!strcmp(arg, "--no-ext-diff"))
3784 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3785 else if (!strcmp(arg, "--textconv"))
3786 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3787 else if (!strcmp(arg, "--no-textconv"))
3788 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3789 else if (!strcmp(arg, "--ignore-submodules")) {
3790 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3791 handle_ignore_submodules_arg(options, "all");
3792 } else if (starts_with(arg, "--ignore-submodules=")) {
3793 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3794 handle_ignore_submodules_arg(options, arg + 20);
3795 } else if (!strcmp(arg, "--submodule"))
3796 DIFF_OPT_SET(options, SUBMODULE_LOG);
3797 else if (starts_with(arg, "--submodule="))
3798 return parse_submodule_opt(options, arg + 12);
3799
3800 /* misc options */
3801 else if (!strcmp(arg, "-z"))
3802 options->line_termination = 0;
3803 else if ((argcount = short_opt('l', av, &optarg))) {
3804 options->rename_limit = strtoul(optarg, NULL, 10);
3805 return argcount;
3806 }
3807 else if ((argcount = short_opt('S', av, &optarg))) {
3808 options->pickaxe = optarg;
3809 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3810 return argcount;
3811 } else if ((argcount = short_opt('G', av, &optarg))) {
3812 options->pickaxe = optarg;
3813 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3814 return argcount;
3815 }
3816 else if (!strcmp(arg, "--pickaxe-all"))
3817 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3818 else if (!strcmp(arg, "--pickaxe-regex"))
3819 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3820 else if ((argcount = short_opt('O', av, &optarg))) {
3821 options->orderfile = optarg;
3822 return argcount;
3823 }
3824 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3825 int offending = parse_diff_filter_opt(optarg, options);
3826 if (offending)
3827 die("unknown change class '%c' in --diff-filter=%s",
3828 offending, optarg);
3829 return argcount;
3830 }
3831 else if (!strcmp(arg, "--abbrev"))
3832 options->abbrev = DEFAULT_ABBREV;
3833 else if (starts_with(arg, "--abbrev=")) {
3834 options->abbrev = strtoul(arg + 9, NULL, 10);
3835 if (options->abbrev < MINIMUM_ABBREV)
3836 options->abbrev = MINIMUM_ABBREV;
3837 else if (40 < options->abbrev)
3838 options->abbrev = 40;
3839 }
3840 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3841 options->a_prefix = optarg;
3842 return argcount;
3843 }
3844 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3845 options->b_prefix = optarg;
3846 return argcount;
3847 }
3848 else if (!strcmp(arg, "--no-prefix"))
3849 options->a_prefix = options->b_prefix = "";
3850 else if (opt_arg(arg, '\0', "inter-hunk-context",
3851 &options->interhunkcontext))
3852 ;
3853 else if (!strcmp(arg, "-W"))
3854 DIFF_OPT_SET(options, FUNCCONTEXT);
3855 else if (!strcmp(arg, "--function-context"))
3856 DIFF_OPT_SET(options, FUNCCONTEXT);
3857 else if (!strcmp(arg, "--no-function-context"))
3858 DIFF_OPT_CLR(options, FUNCCONTEXT);
3859 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3860 options->file = fopen(optarg, "w");
3861 if (!options->file)
3862 die_errno("Could not open '%s'", optarg);
3863 options->close_file = 1;
3864 return argcount;
3865 } else
3866 return 0;
3867 return 1;
3868 }
3869
3870 int parse_rename_score(const char **cp_p)
3871 {
3872 unsigned long num, scale;
3873 int ch, dot;
3874 const char *cp = *cp_p;
3875
3876 num = 0;
3877 scale = 1;
3878 dot = 0;
3879 for (;;) {
3880 ch = *cp;
3881 if ( !dot && ch == '.' ) {
3882 scale = 1;
3883 dot = 1;
3884 } else if ( ch == '%' ) {
3885 scale = dot ? scale*100 : 100;
3886 cp++; /* % is always at the end */
3887 break;
3888 } else if ( ch >= '0' && ch <= '9' ) {
3889 if ( scale < 100000 ) {
3890 scale *= 10;
3891 num = (num*10) + (ch-'0');
3892 }
3893 } else {
3894 break;
3895 }
3896 cp++;
3897 }
3898 *cp_p = cp;
3899
3900 /* user says num divided by scale and we say internally that
3901 * is MAX_SCORE * num / scale.
3902 */
3903 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3904 }
3905
3906 static int diff_scoreopt_parse(const char *opt)
3907 {
3908 int opt1, opt2, cmd;
3909
3910 if (*opt++ != '-')
3911 return -1;
3912 cmd = *opt++;
3913 if (cmd == '-') {
3914 /* convert the long-form arguments into short-form versions */
3915 if (starts_with(opt, "break-rewrites")) {
3916 opt += strlen("break-rewrites");
3917 if (*opt == 0 || *opt++ == '=')
3918 cmd = 'B';
3919 } else if (starts_with(opt, "find-copies")) {
3920 opt += strlen("find-copies");
3921 if (*opt == 0 || *opt++ == '=')
3922 cmd = 'C';
3923 } else if (starts_with(opt, "find-renames")) {
3924 opt += strlen("find-renames");
3925 if (*opt == 0 || *opt++ == '=')
3926 cmd = 'M';
3927 }
3928 }
3929 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3930 return -1; /* that is not a -M, -C nor -B option */
3931
3932 opt1 = parse_rename_score(&opt);
3933 if (cmd != 'B')
3934 opt2 = 0;
3935 else {
3936 if (*opt == 0)
3937 opt2 = 0;
3938 else if (*opt != '/')
3939 return -1; /* we expect -B80/99 or -B80 */
3940 else {
3941 opt++;
3942 opt2 = parse_rename_score(&opt);
3943 }
3944 }
3945 if (*opt != 0)
3946 return -1;
3947 return opt1 | (opt2 << 16);
3948 }
3949
3950 struct diff_queue_struct diff_queued_diff;
3951
3952 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3953 {
3954 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
3955 queue->queue[queue->nr++] = dp;
3956 }
3957
3958 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3959 struct diff_filespec *one,
3960 struct diff_filespec *two)
3961 {
3962 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3963 dp->one = one;
3964 dp->two = two;
3965 if (queue)
3966 diff_q(queue, dp);
3967 return dp;
3968 }
3969
3970 void diff_free_filepair(struct diff_filepair *p)
3971 {
3972 free_filespec(p->one);
3973 free_filespec(p->two);
3974 free(p);
3975 }
3976
3977 /* This is different from find_unique_abbrev() in that
3978 * it stuffs the result with dots for alignment.
3979 */
3980 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3981 {
3982 int abblen;
3983 const char *abbrev;
3984 if (len == 40)
3985 return sha1_to_hex(sha1);
3986
3987 abbrev = find_unique_abbrev(sha1, len);
3988 abblen = strlen(abbrev);
3989 if (abblen < 37) {
3990 static char hex[41];
3991 if (len < abblen && abblen <= len + 2)
3992 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3993 else
3994 sprintf(hex, "%s...", abbrev);
3995 return hex;
3996 }
3997 return sha1_to_hex(sha1);
3998 }
3999
4000 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4001 {
4002 int line_termination = opt->line_termination;
4003 int inter_name_termination = line_termination ? '\t' : '\0';
4004
4005 fprintf(opt->file, "%s", diff_line_prefix(opt));
4006 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4007 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4008 diff_unique_abbrev(p->one->sha1, opt->abbrev));
4009 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
4010 }
4011 if (p->score) {
4012 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4013 inter_name_termination);
4014 } else {
4015 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4016 }
4017
4018 if (p->status == DIFF_STATUS_COPIED ||
4019 p->status == DIFF_STATUS_RENAMED) {
4020 const char *name_a, *name_b;
4021 name_a = p->one->path;
4022 name_b = p->two->path;
4023 strip_prefix(opt->prefix_length, &name_a, &name_b);
4024 write_name_quoted(name_a, opt->file, inter_name_termination);
4025 write_name_quoted(name_b, opt->file, line_termination);
4026 } else {
4027 const char *name_a, *name_b;
4028 name_a = p->one->mode ? p->one->path : p->two->path;
4029 name_b = NULL;
4030 strip_prefix(opt->prefix_length, &name_a, &name_b);
4031 write_name_quoted(name_a, opt->file, line_termination);
4032 }
4033 }
4034
4035 int diff_unmodified_pair(struct diff_filepair *p)
4036 {
4037 /* This function is written stricter than necessary to support
4038 * the currently implemented transformers, but the idea is to
4039 * let transformers to produce diff_filepairs any way they want,
4040 * and filter and clean them up here before producing the output.
4041 */
4042 struct diff_filespec *one = p->one, *two = p->two;
4043
4044 if (DIFF_PAIR_UNMERGED(p))
4045 return 0; /* unmerged is interesting */
4046
4047 /* deletion, addition, mode or type change
4048 * and rename are all interesting.
4049 */
4050 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4051 DIFF_PAIR_MODE_CHANGED(p) ||
4052 strcmp(one->path, two->path))
4053 return 0;
4054
4055 /* both are valid and point at the same path. that is, we are
4056 * dealing with a change.
4057 */
4058 if (one->sha1_valid && two->sha1_valid &&
4059 !hashcmp(one->sha1, two->sha1) &&
4060 !one->dirty_submodule && !two->dirty_submodule)
4061 return 1; /* no change */
4062 if (!one->sha1_valid && !two->sha1_valid)
4063 return 1; /* both look at the same file on the filesystem. */
4064 return 0;
4065 }
4066
4067 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4068 {
4069 if (diff_unmodified_pair(p))
4070 return;
4071
4072 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4073 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4074 return; /* no tree diffs in patch format */
4075
4076 run_diff(p, o);
4077 }
4078
4079 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4080 struct diffstat_t *diffstat)
4081 {
4082 if (diff_unmodified_pair(p))
4083 return;
4084
4085 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4086 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4087 return; /* no useful stat for tree diffs */
4088
4089 run_diffstat(p, o, diffstat);
4090 }
4091
4092 static void diff_flush_checkdiff(struct diff_filepair *p,
4093 struct diff_options *o)
4094 {
4095 if (diff_unmodified_pair(p))
4096 return;
4097
4098 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4099 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4100 return; /* nothing to check in tree diffs */
4101
4102 run_checkdiff(p, o);
4103 }
4104
4105 int diff_queue_is_empty(void)
4106 {
4107 struct diff_queue_struct *q = &diff_queued_diff;
4108 int i;
4109 for (i = 0; i < q->nr; i++)
4110 if (!diff_unmodified_pair(q->queue[i]))
4111 return 0;
4112 return 1;
4113 }
4114
4115 #if DIFF_DEBUG
4116 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4117 {
4118 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4119 x, one ? one : "",
4120 s->path,
4121 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4122 s->mode,
4123 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4124 fprintf(stderr, "queue[%d] %s size %lu\n",
4125 x, one ? one : "",
4126 s->size);
4127 }
4128
4129 void diff_debug_filepair(const struct diff_filepair *p, int i)
4130 {
4131 diff_debug_filespec(p->one, i, "one");
4132 diff_debug_filespec(p->two, i, "two");
4133 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4134 p->score, p->status ? p->status : '?',
4135 p->one->rename_used, p->broken_pair);
4136 }
4137
4138 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4139 {
4140 int i;
4141 if (msg)
4142 fprintf(stderr, "%s\n", msg);
4143 fprintf(stderr, "q->nr = %d\n", q->nr);
4144 for (i = 0; i < q->nr; i++) {
4145 struct diff_filepair *p = q->queue[i];
4146 diff_debug_filepair(p, i);
4147 }
4148 }
4149 #endif
4150
4151 static void diff_resolve_rename_copy(void)
4152 {
4153 int i;
4154 struct diff_filepair *p;
4155 struct diff_queue_struct *q = &diff_queued_diff;
4156
4157 diff_debug_queue("resolve-rename-copy", q);
4158
4159 for (i = 0; i < q->nr; i++) {
4160 p = q->queue[i];
4161 p->status = 0; /* undecided */
4162 if (DIFF_PAIR_UNMERGED(p))
4163 p->status = DIFF_STATUS_UNMERGED;
4164 else if (!DIFF_FILE_VALID(p->one))
4165 p->status = DIFF_STATUS_ADDED;
4166 else if (!DIFF_FILE_VALID(p->two))
4167 p->status = DIFF_STATUS_DELETED;
4168 else if (DIFF_PAIR_TYPE_CHANGED(p))
4169 p->status = DIFF_STATUS_TYPE_CHANGED;
4170
4171 /* from this point on, we are dealing with a pair
4172 * whose both sides are valid and of the same type, i.e.
4173 * either in-place edit or rename/copy edit.
4174 */
4175 else if (DIFF_PAIR_RENAME(p)) {
4176 /*
4177 * A rename might have re-connected a broken
4178 * pair up, causing the pathnames to be the
4179 * same again. If so, that's not a rename at
4180 * all, just a modification..
4181 *
4182 * Otherwise, see if this source was used for
4183 * multiple renames, in which case we decrement
4184 * the count, and call it a copy.
4185 */
4186 if (!strcmp(p->one->path, p->two->path))
4187 p->status = DIFF_STATUS_MODIFIED;
4188 else if (--p->one->rename_used > 0)
4189 p->status = DIFF_STATUS_COPIED;
4190 else
4191 p->status = DIFF_STATUS_RENAMED;
4192 }
4193 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4194 p->one->mode != p->two->mode ||
4195 p->one->dirty_submodule ||
4196 p->two->dirty_submodule ||
4197 is_null_sha1(p->one->sha1))
4198 p->status = DIFF_STATUS_MODIFIED;
4199 else {
4200 /* This is a "no-change" entry and should not
4201 * happen anymore, but prepare for broken callers.
4202 */
4203 error("feeding unmodified %s to diffcore",
4204 p->one->path);
4205 p->status = DIFF_STATUS_UNKNOWN;
4206 }
4207 }
4208 diff_debug_queue("resolve-rename-copy done", q);
4209 }
4210
4211 static int check_pair_status(struct diff_filepair *p)
4212 {
4213 switch (p->status) {
4214 case DIFF_STATUS_UNKNOWN:
4215 return 0;
4216 case 0:
4217 die("internal error in diff-resolve-rename-copy");
4218 default:
4219 return 1;
4220 }
4221 }
4222
4223 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4224 {
4225 int fmt = opt->output_format;
4226
4227 if (fmt & DIFF_FORMAT_CHECKDIFF)
4228 diff_flush_checkdiff(p, opt);
4229 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4230 diff_flush_raw(p, opt);
4231 else if (fmt & DIFF_FORMAT_NAME) {
4232 const char *name_a, *name_b;
4233 name_a = p->two->path;
4234 name_b = NULL;
4235 strip_prefix(opt->prefix_length, &name_a, &name_b);
4236 write_name_quoted(name_a, opt->file, opt->line_termination);
4237 }
4238 }
4239
4240 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4241 {
4242 if (fs->mode)
4243 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4244 else
4245 fprintf(file, " %s ", newdelete);
4246 write_name_quoted(fs->path, file, '\n');
4247 }
4248
4249
4250 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4251 const char *line_prefix)
4252 {
4253 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4254 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4255 p->two->mode, show_name ? ' ' : '\n');
4256 if (show_name) {
4257 write_name_quoted(p->two->path, file, '\n');
4258 }
4259 }
4260 }
4261
4262 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4263 const char *line_prefix)
4264 {
4265 char *names = pprint_rename(p->one->path, p->two->path);
4266
4267 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4268 free(names);
4269 show_mode_change(file, p, 0, line_prefix);
4270 }
4271
4272 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4273 {
4274 FILE *file = opt->file;
4275 const char *line_prefix = diff_line_prefix(opt);
4276
4277 switch(p->status) {
4278 case DIFF_STATUS_DELETED:
4279 fputs(line_prefix, file);
4280 show_file_mode_name(file, "delete", p->one);
4281 break;
4282 case DIFF_STATUS_ADDED:
4283 fputs(line_prefix, file);
4284 show_file_mode_name(file, "create", p->two);
4285 break;
4286 case DIFF_STATUS_COPIED:
4287 fputs(line_prefix, file);
4288 show_rename_copy(file, "copy", p, line_prefix);
4289 break;
4290 case DIFF_STATUS_RENAMED:
4291 fputs(line_prefix, file);
4292 show_rename_copy(file, "rename", p, line_prefix);
4293 break;
4294 default:
4295 if (p->score) {
4296 fprintf(file, "%s rewrite ", line_prefix);
4297 write_name_quoted(p->two->path, file, ' ');
4298 fprintf(file, "(%d%%)\n", similarity_index(p));
4299 }
4300 show_mode_change(file, p, !p->score, line_prefix);
4301 break;
4302 }
4303 }
4304
4305 struct patch_id_t {
4306 git_SHA_CTX *ctx;
4307 int patchlen;
4308 };
4309
4310 static int remove_space(char *line, int len)
4311 {
4312 int i;
4313 char *dst = line;
4314 unsigned char c;
4315
4316 for (i = 0; i < len; i++)
4317 if (!isspace((c = line[i])))
4318 *dst++ = c;
4319
4320 return dst - line;
4321 }
4322
4323 static void patch_id_consume(void *priv, char *line, unsigned long len)
4324 {
4325 struct patch_id_t *data = priv;
4326 int new_len;
4327
4328 /* Ignore line numbers when computing the SHA1 of the patch */
4329 if (starts_with(line, "@@ -"))
4330 return;
4331
4332 new_len = remove_space(line, len);
4333
4334 git_SHA1_Update(data->ctx, line, new_len);
4335 data->patchlen += new_len;
4336 }
4337
4338 /* returns 0 upon success, and writes result into sha1 */
4339 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4340 {
4341 struct diff_queue_struct *q = &diff_queued_diff;
4342 int i;
4343 git_SHA_CTX ctx;
4344 struct patch_id_t data;
4345 char buffer[PATH_MAX * 4 + 20];
4346
4347 git_SHA1_Init(&ctx);
4348 memset(&data, 0, sizeof(struct patch_id_t));
4349 data.ctx = &ctx;
4350
4351 for (i = 0; i < q->nr; i++) {
4352 xpparam_t xpp;
4353 xdemitconf_t xecfg;
4354 mmfile_t mf1, mf2;
4355 struct diff_filepair *p = q->queue[i];
4356 int len1, len2;
4357
4358 memset(&xpp, 0, sizeof(xpp));
4359 memset(&xecfg, 0, sizeof(xecfg));
4360 if (p->status == 0)
4361 return error("internal diff status error");
4362 if (p->status == DIFF_STATUS_UNKNOWN)
4363 continue;
4364 if (diff_unmodified_pair(p))
4365 continue;
4366 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4367 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4368 continue;
4369 if (DIFF_PAIR_UNMERGED(p))
4370 continue;
4371
4372 diff_fill_sha1_info(p->one);
4373 diff_fill_sha1_info(p->two);
4374 if (fill_mmfile(&mf1, p->one) < 0 ||
4375 fill_mmfile(&mf2, p->two) < 0)
4376 return error("unable to read files to diff");
4377
4378 len1 = remove_space(p->one->path, strlen(p->one->path));
4379 len2 = remove_space(p->two->path, strlen(p->two->path));
4380 if (p->one->mode == 0)
4381 len1 = snprintf(buffer, sizeof(buffer),
4382 "diff--gita/%.*sb/%.*s"
4383 "newfilemode%06o"
4384 "---/dev/null"
4385 "+++b/%.*s",
4386 len1, p->one->path,
4387 len2, p->two->path,
4388 p->two->mode,
4389 len2, p->two->path);
4390 else if (p->two->mode == 0)
4391 len1 = snprintf(buffer, sizeof(buffer),
4392 "diff--gita/%.*sb/%.*s"
4393 "deletedfilemode%06o"
4394 "---a/%.*s"
4395 "+++/dev/null",
4396 len1, p->one->path,
4397 len2, p->two->path,
4398 p->one->mode,
4399 len1, p->one->path);
4400 else
4401 len1 = snprintf(buffer, sizeof(buffer),
4402 "diff--gita/%.*sb/%.*s"
4403 "---a/%.*s"
4404 "+++b/%.*s",
4405 len1, p->one->path,
4406 len2, p->two->path,
4407 len1, p->one->path,
4408 len2, p->two->path);
4409 git_SHA1_Update(&ctx, buffer, len1);
4410
4411 if (diff_filespec_is_binary(p->one) ||
4412 diff_filespec_is_binary(p->two)) {
4413 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4414 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4415 continue;
4416 }
4417
4418 xpp.flags = 0;
4419 xecfg.ctxlen = 3;
4420 xecfg.flags = 0;
4421 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4422 &xpp, &xecfg);
4423 }
4424
4425 git_SHA1_Final(sha1, &ctx);
4426 return 0;
4427 }
4428
4429 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4430 {
4431 struct diff_queue_struct *q = &diff_queued_diff;
4432 int i;
4433 int result = diff_get_patch_id(options, sha1);
4434
4435 for (i = 0; i < q->nr; i++)
4436 diff_free_filepair(q->queue[i]);
4437
4438 free(q->queue);
4439 DIFF_QUEUE_CLEAR(q);
4440
4441 return result;
4442 }
4443
4444 static int is_summary_empty(const struct diff_queue_struct *q)
4445 {
4446 int i;
4447
4448 for (i = 0; i < q->nr; i++) {
4449 const struct diff_filepair *p = q->queue[i];
4450
4451 switch (p->status) {
4452 case DIFF_STATUS_DELETED:
4453 case DIFF_STATUS_ADDED:
4454 case DIFF_STATUS_COPIED:
4455 case DIFF_STATUS_RENAMED:
4456 return 0;
4457 default:
4458 if (p->score)
4459 return 0;
4460 if (p->one->mode && p->two->mode &&
4461 p->one->mode != p->two->mode)
4462 return 0;
4463 break;
4464 }
4465 }
4466 return 1;
4467 }
4468
4469 static const char rename_limit_warning[] =
4470 "inexact rename detection was skipped due to too many files.";
4471
4472 static const char degrade_cc_to_c_warning[] =
4473 "only found copies from modified paths due to too many files.";
4474
4475 static const char rename_limit_advice[] =
4476 "you may want to set your %s variable to at least "
4477 "%d and retry the command.";
4478
4479 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4480 {
4481 if (degraded_cc)
4482 warning(degrade_cc_to_c_warning);
4483 else if (needed)
4484 warning(rename_limit_warning);
4485 else
4486 return;
4487 if (0 < needed && needed < 32767)
4488 warning(rename_limit_advice, varname, needed);
4489 }
4490
4491 void diff_flush(struct diff_options *options)
4492 {
4493 struct diff_queue_struct *q = &diff_queued_diff;
4494 int i, output_format = options->output_format;
4495 int separator = 0;
4496 int dirstat_by_line = 0;
4497
4498 /*
4499 * Order: raw, stat, summary, patch
4500 * or: name/name-status/checkdiff (other bits clear)
4501 */
4502 if (!q->nr)
4503 goto free_queue;
4504
4505 if (output_format & (DIFF_FORMAT_RAW |
4506 DIFF_FORMAT_NAME |
4507 DIFF_FORMAT_NAME_STATUS |
4508 DIFF_FORMAT_CHECKDIFF)) {
4509 for (i = 0; i < q->nr; i++) {
4510 struct diff_filepair *p = q->queue[i];
4511 if (check_pair_status(p))
4512 flush_one_pair(p, options);
4513 }
4514 separator++;
4515 }
4516
4517 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4518 dirstat_by_line = 1;
4519
4520 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4521 dirstat_by_line) {
4522 struct diffstat_t diffstat;
4523
4524 memset(&diffstat, 0, sizeof(struct diffstat_t));
4525 for (i = 0; i < q->nr; i++) {
4526 struct diff_filepair *p = q->queue[i];
4527 if (check_pair_status(p))
4528 diff_flush_stat(p, options, &diffstat);
4529 }
4530 if (output_format & DIFF_FORMAT_NUMSTAT)
4531 show_numstat(&diffstat, options);
4532 if (output_format & DIFF_FORMAT_DIFFSTAT)
4533 show_stats(&diffstat, options);
4534 if (output_format & DIFF_FORMAT_SHORTSTAT)
4535 show_shortstats(&diffstat, options);
4536 if (output_format & DIFF_FORMAT_DIRSTAT)
4537 show_dirstat_by_line(&diffstat, options);
4538 free_diffstat_info(&diffstat);
4539 separator++;
4540 }
4541 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4542 show_dirstat(options);
4543
4544 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4545 for (i = 0; i < q->nr; i++) {
4546 diff_summary(options, q->queue[i]);
4547 }
4548 separator++;
4549 }
4550
4551 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4552 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4553 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4554 /*
4555 * run diff_flush_patch for the exit status. setting
4556 * options->file to /dev/null should be safe, because we
4557 * aren't supposed to produce any output anyway.
4558 */
4559 if (options->close_file)
4560 fclose(options->file);
4561 options->file = fopen("/dev/null", "w");
4562 if (!options->file)
4563 die_errno("Could not open /dev/null");
4564 options->close_file = 1;
4565 for (i = 0; i < q->nr; i++) {
4566 struct diff_filepair *p = q->queue[i];
4567 if (check_pair_status(p))
4568 diff_flush_patch(p, options);
4569 if (options->found_changes)
4570 break;
4571 }
4572 }
4573
4574 if (output_format & DIFF_FORMAT_PATCH) {
4575 if (separator) {
4576 fprintf(options->file, "%s%c",
4577 diff_line_prefix(options),
4578 options->line_termination);
4579 if (options->stat_sep) {
4580 /* attach patch instead of inline */
4581 fputs(options->stat_sep, options->file);
4582 }
4583 }
4584
4585 for (i = 0; i < q->nr; i++) {
4586 struct diff_filepair *p = q->queue[i];
4587 if (check_pair_status(p))
4588 diff_flush_patch(p, options);
4589 }
4590 }
4591
4592 if (output_format & DIFF_FORMAT_CALLBACK)
4593 options->format_callback(q, options, options->format_callback_data);
4594
4595 for (i = 0; i < q->nr; i++)
4596 diff_free_filepair(q->queue[i]);
4597 free_queue:
4598 free(q->queue);
4599 DIFF_QUEUE_CLEAR(q);
4600 if (options->close_file)
4601 fclose(options->file);
4602
4603 /*
4604 * Report the content-level differences with HAS_CHANGES;
4605 * diff_addremove/diff_change does not set the bit when
4606 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4607 */
4608 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4609 if (options->found_changes)
4610 DIFF_OPT_SET(options, HAS_CHANGES);
4611 else
4612 DIFF_OPT_CLR(options, HAS_CHANGES);
4613 }
4614 }
4615
4616 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4617 {
4618 return (((p->status == DIFF_STATUS_MODIFIED) &&
4619 ((p->score &&
4620 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4621 (!p->score &&
4622 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4623 ((p->status != DIFF_STATUS_MODIFIED) &&
4624 filter_bit_tst(p->status, options)));
4625 }
4626
4627 static void diffcore_apply_filter(struct diff_options *options)
4628 {
4629 int i;
4630 struct diff_queue_struct *q = &diff_queued_diff;
4631 struct diff_queue_struct outq;
4632
4633 DIFF_QUEUE_CLEAR(&outq);
4634
4635 if (!options->filter)
4636 return;
4637
4638 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4639 int found;
4640 for (i = found = 0; !found && i < q->nr; i++) {
4641 if (match_filter(options, q->queue[i]))
4642 found++;
4643 }
4644 if (found)
4645 return;
4646
4647 /* otherwise we will clear the whole queue
4648 * by copying the empty outq at the end of this
4649 * function, but first clear the current entries
4650 * in the queue.
4651 */
4652 for (i = 0; i < q->nr; i++)
4653 diff_free_filepair(q->queue[i]);
4654 }
4655 else {
4656 /* Only the matching ones */
4657 for (i = 0; i < q->nr; i++) {
4658 struct diff_filepair *p = q->queue[i];
4659 if (match_filter(options, p))
4660 diff_q(&outq, p);
4661 else
4662 diff_free_filepair(p);
4663 }
4664 }
4665 free(q->queue);
4666 *q = outq;
4667 }
4668
4669 /* Check whether two filespecs with the same mode and size are identical */
4670 static int diff_filespec_is_identical(struct diff_filespec *one,
4671 struct diff_filespec *two)
4672 {
4673 if (S_ISGITLINK(one->mode))
4674 return 0;
4675 if (diff_populate_filespec(one, 0))
4676 return 0;
4677 if (diff_populate_filespec(two, 0))
4678 return 0;
4679 return !memcmp(one->data, two->data, one->size);
4680 }
4681
4682 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4683 {
4684 if (p->done_skip_stat_unmatch)
4685 return p->skip_stat_unmatch_result;
4686
4687 p->done_skip_stat_unmatch = 1;
4688 p->skip_stat_unmatch_result = 0;
4689 /*
4690 * 1. Entries that come from stat info dirtiness
4691 * always have both sides (iow, not create/delete),
4692 * one side of the object name is unknown, with
4693 * the same mode and size. Keep the ones that
4694 * do not match these criteria. They have real
4695 * differences.
4696 *
4697 * 2. At this point, the file is known to be modified,
4698 * with the same mode and size, and the object
4699 * name of one side is unknown. Need to inspect
4700 * the identical contents.
4701 */
4702 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4703 !DIFF_FILE_VALID(p->two) ||
4704 (p->one->sha1_valid && p->two->sha1_valid) ||
4705 (p->one->mode != p->two->mode) ||
4706 diff_populate_filespec(p->one, 1) ||
4707 diff_populate_filespec(p->two, 1) ||
4708 (p->one->size != p->two->size) ||
4709 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4710 p->skip_stat_unmatch_result = 1;
4711 return p->skip_stat_unmatch_result;
4712 }
4713
4714 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4715 {
4716 int i;
4717 struct diff_queue_struct *q = &diff_queued_diff;
4718 struct diff_queue_struct outq;
4719 DIFF_QUEUE_CLEAR(&outq);
4720
4721 for (i = 0; i < q->nr; i++) {
4722 struct diff_filepair *p = q->queue[i];
4723
4724 if (diff_filespec_check_stat_unmatch(p))
4725 diff_q(&outq, p);
4726 else {
4727 /*
4728 * The caller can subtract 1 from skip_stat_unmatch
4729 * to determine how many paths were dirty only
4730 * due to stat info mismatch.
4731 */
4732 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4733 diffopt->skip_stat_unmatch++;
4734 diff_free_filepair(p);
4735 }
4736 }
4737 free(q->queue);
4738 *q = outq;
4739 }
4740
4741 static int diffnamecmp(const void *a_, const void *b_)
4742 {
4743 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4744 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4745 const char *name_a, *name_b;
4746
4747 name_a = a->one ? a->one->path : a->two->path;
4748 name_b = b->one ? b->one->path : b->two->path;
4749 return strcmp(name_a, name_b);
4750 }
4751
4752 void diffcore_fix_diff_index(struct diff_options *options)
4753 {
4754 struct diff_queue_struct *q = &diff_queued_diff;
4755 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4756 }
4757
4758 void diffcore_std(struct diff_options *options)
4759 {
4760 if (options->skip_stat_unmatch)
4761 diffcore_skip_stat_unmatch(options);
4762 if (!options->found_follow) {
4763 /* See try_to_follow_renames() in tree-diff.c */
4764 if (options->break_opt != -1)
4765 diffcore_break(options->break_opt);
4766 if (options->detect_rename)
4767 diffcore_rename(options);
4768 if (options->break_opt != -1)
4769 diffcore_merge_broken();
4770 }
4771 if (options->pickaxe)
4772 diffcore_pickaxe(options);
4773 if (options->orderfile)
4774 diffcore_order(options->orderfile);
4775 if (!options->found_follow)
4776 /* See try_to_follow_renames() in tree-diff.c */
4777 diff_resolve_rename_copy();
4778 diffcore_apply_filter(options);
4779
4780 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4781 DIFF_OPT_SET(options, HAS_CHANGES);
4782 else
4783 DIFF_OPT_CLR(options, HAS_CHANGES);
4784
4785 options->found_follow = 0;
4786 }
4787
4788 int diff_result_code(struct diff_options *opt, int status)
4789 {
4790 int result = 0;
4791
4792 diff_warn_rename_limit("diff.renameLimit",
4793 opt->needed_rename_limit,
4794 opt->degraded_cc_to_c);
4795 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4796 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4797 return status;
4798 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4799 DIFF_OPT_TST(opt, HAS_CHANGES))
4800 result |= 01;
4801 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4802 DIFF_OPT_TST(opt, CHECK_FAILED))
4803 result |= 02;
4804 return result;
4805 }
4806
4807 int diff_can_quit_early(struct diff_options *opt)
4808 {
4809 return (DIFF_OPT_TST(opt, QUICK) &&
4810 !opt->filter &&
4811 DIFF_OPT_TST(opt, HAS_CHANGES));
4812 }
4813
4814 /*
4815 * Shall changes to this submodule be ignored?
4816 *
4817 * Submodule changes can be configured to be ignored separately for each path,
4818 * but that configuration can be overridden from the command line.
4819 */
4820 static int is_submodule_ignored(const char *path, struct diff_options *options)
4821 {
4822 int ignored = 0;
4823 unsigned orig_flags = options->flags;
4824 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4825 set_diffopt_flags_from_submodule_config(options, path);
4826 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4827 ignored = 1;
4828 options->flags = orig_flags;
4829 return ignored;
4830 }
4831
4832 void diff_addremove(struct diff_options *options,
4833 int addremove, unsigned mode,
4834 const unsigned char *sha1,
4835 int sha1_valid,
4836 const char *concatpath, unsigned dirty_submodule)
4837 {
4838 struct diff_filespec *one, *two;
4839
4840 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4841 return;
4842
4843 /* This may look odd, but it is a preparation for
4844 * feeding "there are unchanged files which should
4845 * not produce diffs, but when you are doing copy
4846 * detection you would need them, so here they are"
4847 * entries to the diff-core. They will be prefixed
4848 * with something like '=' or '*' (I haven't decided
4849 * which but should not make any difference).
4850 * Feeding the same new and old to diff_change()
4851 * also has the same effect.
4852 * Before the final output happens, they are pruned after
4853 * merged into rename/copy pairs as appropriate.
4854 */
4855 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4856 addremove = (addremove == '+' ? '-' :
4857 addremove == '-' ? '+' : addremove);
4858
4859 if (options->prefix &&
4860 strncmp(concatpath, options->prefix, options->prefix_length))
4861 return;
4862
4863 one = alloc_filespec(concatpath);
4864 two = alloc_filespec(concatpath);
4865
4866 if (addremove != '+')
4867 fill_filespec(one, sha1, sha1_valid, mode);
4868 if (addremove != '-') {
4869 fill_filespec(two, sha1, sha1_valid, mode);
4870 two->dirty_submodule = dirty_submodule;
4871 }
4872
4873 diff_queue(&diff_queued_diff, one, two);
4874 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4875 DIFF_OPT_SET(options, HAS_CHANGES);
4876 }
4877
4878 void diff_change(struct diff_options *options,
4879 unsigned old_mode, unsigned new_mode,
4880 const unsigned char *old_sha1,
4881 const unsigned char *new_sha1,
4882 int old_sha1_valid, int new_sha1_valid,
4883 const char *concatpath,
4884 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4885 {
4886 struct diff_filespec *one, *two;
4887 struct diff_filepair *p;
4888
4889 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4890 is_submodule_ignored(concatpath, options))
4891 return;
4892
4893 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4894 unsigned tmp;
4895 const unsigned char *tmp_c;
4896 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4897 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4898 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4899 new_sha1_valid = tmp;
4900 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4901 new_dirty_submodule = tmp;
4902 }
4903
4904 if (options->prefix &&
4905 strncmp(concatpath, options->prefix, options->prefix_length))
4906 return;
4907
4908 one = alloc_filespec(concatpath);
4909 two = alloc_filespec(concatpath);
4910 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4911 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4912 one->dirty_submodule = old_dirty_submodule;
4913 two->dirty_submodule = new_dirty_submodule;
4914 p = diff_queue(&diff_queued_diff, one, two);
4915
4916 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4917 return;
4918
4919 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
4920 !diff_filespec_check_stat_unmatch(p))
4921 return;
4922
4923 DIFF_OPT_SET(options, HAS_CHANGES);
4924 }
4925
4926 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4927 {
4928 struct diff_filepair *pair;
4929 struct diff_filespec *one, *two;
4930
4931 if (options->prefix &&
4932 strncmp(path, options->prefix, options->prefix_length))
4933 return NULL;
4934
4935 one = alloc_filespec(path);
4936 two = alloc_filespec(path);
4937 pair = diff_queue(&diff_queued_diff, one, two);
4938 pair->is_unmerged = 1;
4939 return pair;
4940 }
4941
4942 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4943 size_t *outsize)
4944 {
4945 struct diff_tempfile *temp;
4946 const char *argv[3];
4947 const char **arg = argv;
4948 struct child_process child;
4949 struct strbuf buf = STRBUF_INIT;
4950 int err = 0;
4951
4952 temp = prepare_temp_file(spec->path, spec);
4953 *arg++ = pgm;
4954 *arg++ = temp->name;
4955 *arg = NULL;
4956
4957 memset(&child, 0, sizeof(child));
4958 child.use_shell = 1;
4959 child.argv = argv;
4960 child.out = -1;
4961 if (start_command(&child)) {
4962 remove_tempfile();
4963 return NULL;
4964 }
4965
4966 if (strbuf_read(&buf, child.out, 0) < 0)
4967 err = error("error reading from textconv command '%s'", pgm);
4968 close(child.out);
4969
4970 if (finish_command(&child) || err) {
4971 strbuf_release(&buf);
4972 remove_tempfile();
4973 return NULL;
4974 }
4975 remove_tempfile();
4976
4977 return strbuf_detach(&buf, outsize);
4978 }
4979
4980 size_t fill_textconv(struct userdiff_driver *driver,
4981 struct diff_filespec *df,
4982 char **outbuf)
4983 {
4984 size_t size;
4985
4986 if (!driver || !driver->textconv) {
4987 if (!DIFF_FILE_VALID(df)) {
4988 *outbuf = "";
4989 return 0;
4990 }
4991 if (diff_populate_filespec(df, 0))
4992 die("unable to read files to diff");
4993 *outbuf = df->data;
4994 return df->size;
4995 }
4996
4997 if (driver->textconv_cache && df->sha1_valid) {
4998 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4999 &size);
5000 if (*outbuf)
5001 return size;
5002 }
5003
5004 *outbuf = run_textconv(driver->textconv, df, &size);
5005 if (!*outbuf)
5006 die("unable to read files to diff");
5007
5008 if (driver->textconv_cache && df->sha1_valid) {
5009 /* ignore errors, as we might be in a readonly repository */
5010 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
5011 size);
5012 /*
5013 * we could save up changes and flush them all at the end,
5014 * but we would need an extra call after all diffing is done.
5015 * Since generating a cache entry is the slow path anyway,
5016 * this extra overhead probably isn't a big deal.
5017 */
5018 notes_cache_write(driver->textconv_cache);
5019 }
5020
5021 return size;
5022 }
5023
5024 void setup_diff_pager(struct diff_options *opt)
5025 {
5026 /*
5027 * If the user asked for our exit code, then either they want --quiet
5028 * or --exit-code. We should definitely not bother with a pager in the
5029 * former case, as we will generate no output. Since we still properly
5030 * report our exit code even when a pager is run, we _could_ run a
5031 * pager with --exit-code. But since we have not done so historically,
5032 * and because it is easy to find people oneline advising "git diff
5033 * --exit-code" in hooks and other scripts, we do not do so.
5034 */
5035 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5036 check_pager_config("diff") != 0)
5037 setup_pager();
5038 }
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