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rebase: avoid non-function use of "return" on FreeBSD
[git/mjg.git] / diff.c
blob635dee244d767bffc689550fd3e32d0ac1a37fea
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 if (diffstat->nr == diffstat->alloc) {
1365 diffstat->alloc = alloc_nr(diffstat->alloc);
1366 diffstat->files = xrealloc(diffstat->files,
1367 diffstat->alloc * sizeof(x));
1368 }
1369 diffstat->files[diffstat->nr++] = x;
1370 if (name_b) {
1371 x->from_name = xstrdup(name_a);
1372 x->name = xstrdup(name_b);
1373 x->is_renamed = 1;
1374 }
1375 else {
1376 x->from_name = NULL;
1377 x->name = xstrdup(name_a);
1378 }
1379 return x;
1380 }
1381
1382 static void diffstat_consume(void *priv, char *line, unsigned long len)
1383 {
1384 struct diffstat_t *diffstat = priv;
1385 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1386
1387 if (line[0] == '+')
1388 x->added++;
1389 else if (line[0] == '-')
1390 x->deleted++;
1391 }
1392
1393 const char mime_boundary_leader[] = "------------";
1394
1395 static int scale_linear(int it, int width, int max_change)
1396 {
1397 if (!it)
1398 return 0;
1399 /*
1400 * make sure that at least one '-' or '+' is printed if
1401 * there is any change to this path. The easiest way is to
1402 * scale linearly as if the alloted width is one column shorter
1403 * than it is, and then add 1 to the result.
1404 */
1405 return 1 + (it * (width - 1) / max_change);
1406 }
1407
1408 static void show_name(FILE *file,
1409 const char *prefix, const char *name, int len)
1410 {
1411 fprintf(file, " %s%-*s |", prefix, len, name);
1412 }
1413
1414 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1415 {
1416 if (cnt <= 0)
1417 return;
1418 fprintf(file, "%s", set);
1419 while (cnt--)
1420 putc(ch, file);
1421 fprintf(file, "%s", reset);
1422 }
1423
1424 static void fill_print_name(struct diffstat_file *file)
1425 {
1426 char *pname;
1427
1428 if (file->print_name)
1429 return;
1430
1431 if (!file->is_renamed) {
1432 struct strbuf buf = STRBUF_INIT;
1433 if (quote_c_style(file->name, &buf, NULL, 0)) {
1434 pname = strbuf_detach(&buf, NULL);
1435 } else {
1436 pname = file->name;
1437 strbuf_release(&buf);
1438 }
1439 } else {
1440 pname = pprint_rename(file->from_name, file->name);
1441 }
1442 file->print_name = pname;
1443 }
1444
1445 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1446 {
1447 struct strbuf sb = STRBUF_INIT;
1448 int ret;
1449
1450 if (!files) {
1451 assert(insertions == 0 && deletions == 0);
1452 return fprintf(fp, "%s\n", " 0 files changed");
1453 }
1454
1455 strbuf_addf(&sb,
1456 (files == 1) ? " %d file changed" : " %d files changed",
1457 files);
1458
1459 /*
1460 * For binary diff, the caller may want to print "x files
1461 * changed" with insertions == 0 && deletions == 0.
1462 *
1463 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1464 * is probably less confusing (i.e skip over "2 files changed
1465 * but nothing about added/removed lines? Is this a bug in Git?").
1466 */
1467 if (insertions || deletions == 0) {
1468 /*
1469 * TRANSLATORS: "+" in (+) is a line addition marker;
1470 * do not translate it.
1471 */
1472 strbuf_addf(&sb,
1473 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1474 insertions);
1475 }
1476
1477 if (deletions || insertions == 0) {
1478 /*
1479 * TRANSLATORS: "-" in (-) is a line removal marker;
1480 * do not translate it.
1481 */
1482 strbuf_addf(&sb,
1483 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1484 deletions);
1485 }
1486 strbuf_addch(&sb, '\n');
1487 ret = fputs(sb.buf, fp);
1488 strbuf_release(&sb);
1489 return ret;
1490 }
1491
1492 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1493 {
1494 int i, len, add, del, adds = 0, dels = 0;
1495 uintmax_t max_change = 0, max_len = 0;
1496 int total_files = data->nr, count;
1497 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1498 const char *reset, *add_c, *del_c;
1499 const char *line_prefix = "";
1500 int extra_shown = 0;
1501
1502 if (data->nr == 0)
1503 return;
1504
1505 line_prefix = diff_line_prefix(options);
1506 count = options->stat_count ? options->stat_count : data->nr;
1507
1508 reset = diff_get_color_opt(options, DIFF_RESET);
1509 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1510 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1511
1512 /*
1513 * Find the longest filename and max number of changes
1514 */
1515 for (i = 0; (i < count) && (i < data->nr); i++) {
1516 struct diffstat_file *file = data->files[i];
1517 uintmax_t change = file->added + file->deleted;
1518
1519 if (!file->is_interesting && (change == 0)) {
1520 count++; /* not shown == room for one more */
1521 continue;
1522 }
1523 fill_print_name(file);
1524 len = strlen(file->print_name);
1525 if (max_len < len)
1526 max_len = len;
1527
1528 if (file->is_unmerged) {
1529 /* "Unmerged" is 8 characters */
1530 bin_width = bin_width < 8 ? 8 : bin_width;
1531 continue;
1532 }
1533 if (file->is_binary) {
1534 /* "Bin XXX -> YYY bytes" */
1535 int w = 14 + decimal_width(file->added)
1536 + decimal_width(file->deleted);
1537 bin_width = bin_width < w ? w : bin_width;
1538 /* Display change counts aligned with "Bin" */
1539 number_width = 3;
1540 continue;
1541 }
1542
1543 if (max_change < change)
1544 max_change = change;
1545 }
1546 count = i; /* where we can stop scanning in data->files[] */
1547
1548 /*
1549 * We have width = stat_width or term_columns() columns total.
1550 * We want a maximum of min(max_len, stat_name_width) for the name part.
1551 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1552 * We also need 1 for " " and 4 + decimal_width(max_change)
1553 * for " | NNNN " and one the empty column at the end, altogether
1554 * 6 + decimal_width(max_change).
1555 *
1556 * If there's not enough space, we will use the smaller of
1557 * stat_name_width (if set) and 5/8*width for the filename,
1558 * and the rest for constant elements + graph part, but no more
1559 * than stat_graph_width for the graph part.
1560 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1561 * for the standard terminal size).
1562 *
1563 * In other words: stat_width limits the maximum width, and
1564 * stat_name_width fixes the maximum width of the filename,
1565 * and is also used to divide available columns if there
1566 * aren't enough.
1567 *
1568 * Binary files are displayed with "Bin XXX -> YYY bytes"
1569 * instead of the change count and graph. This part is treated
1570 * similarly to the graph part, except that it is not
1571 * "scaled". If total width is too small to accommodate the
1572 * guaranteed minimum width of the filename part and the
1573 * separators and this message, this message will "overflow"
1574 * making the line longer than the maximum width.
1575 */
1576
1577 if (options->stat_width == -1)
1578 width = term_columns() - options->output_prefix_length;
1579 else
1580 width = options->stat_width ? options->stat_width : 80;
1581 number_width = decimal_width(max_change) > number_width ?
1582 decimal_width(max_change) : number_width;
1583
1584 if (options->stat_graph_width == -1)
1585 options->stat_graph_width = diff_stat_graph_width;
1586
1587 /*
1588 * Guarantee 3/8*16==6 for the graph part
1589 * and 5/8*16==10 for the filename part
1590 */
1591 if (width < 16 + 6 + number_width)
1592 width = 16 + 6 + number_width;
1593
1594 /*
1595 * First assign sizes that are wanted, ignoring available width.
1596 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1597 * starting from "XXX" should fit in graph_width.
1598 */
1599 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1600 if (options->stat_graph_width &&
1601 options->stat_graph_width < graph_width)
1602 graph_width = options->stat_graph_width;
1603
1604 name_width = (options->stat_name_width > 0 &&
1605 options->stat_name_width < max_len) ?
1606 options->stat_name_width : max_len;
1607
1608 /*
1609 * Adjust adjustable widths not to exceed maximum width
1610 */
1611 if (name_width + number_width + 6 + graph_width > width) {
1612 if (graph_width > width * 3/8 - number_width - 6) {
1613 graph_width = width * 3/8 - number_width - 6;
1614 if (graph_width < 6)
1615 graph_width = 6;
1616 }
1617
1618 if (options->stat_graph_width &&
1619 graph_width > options->stat_graph_width)
1620 graph_width = options->stat_graph_width;
1621 if (name_width > width - number_width - 6 - graph_width)
1622 name_width = width - number_width - 6 - graph_width;
1623 else
1624 graph_width = width - number_width - 6 - name_width;
1625 }
1626
1627 /*
1628 * From here name_width is the width of the name area,
1629 * and graph_width is the width of the graph area.
1630 * max_change is used to scale graph properly.
1631 */
1632 for (i = 0; i < count; i++) {
1633 const char *prefix = "";
1634 struct diffstat_file *file = data->files[i];
1635 char *name = file->print_name;
1636 uintmax_t added = file->added;
1637 uintmax_t deleted = file->deleted;
1638 int name_len;
1639
1640 if (!file->is_interesting && (added + deleted == 0))
1641 continue;
1642
1643 /*
1644 * "scale" the filename
1645 */
1646 len = name_width;
1647 name_len = strlen(name);
1648 if (name_width < name_len) {
1649 char *slash;
1650 prefix = "...";
1651 len -= 3;
1652 name += name_len - len;
1653 slash = strchr(name, '/');
1654 if (slash)
1655 name = slash;
1656 }
1657
1658 if (file->is_binary) {
1659 fprintf(options->file, "%s", line_prefix);
1660 show_name(options->file, prefix, name, len);
1661 fprintf(options->file, " %*s", number_width, "Bin");
1662 if (!added && !deleted) {
1663 putc('\n', options->file);
1664 continue;
1665 }
1666 fprintf(options->file, " %s%"PRIuMAX"%s",
1667 del_c, deleted, reset);
1668 fprintf(options->file, " -> ");
1669 fprintf(options->file, "%s%"PRIuMAX"%s",
1670 add_c, added, reset);
1671 fprintf(options->file, " bytes");
1672 fprintf(options->file, "\n");
1673 continue;
1674 }
1675 else if (file->is_unmerged) {
1676 fprintf(options->file, "%s", line_prefix);
1677 show_name(options->file, prefix, name, len);
1678 fprintf(options->file, " Unmerged\n");
1679 continue;
1680 }
1681
1682 /*
1683 * scale the add/delete
1684 */
1685 add = added;
1686 del = deleted;
1687
1688 if (graph_width <= max_change) {
1689 int total = scale_linear(add + del, graph_width, max_change);
1690 if (total < 2 && add && del)
1691 /* width >= 2 due to the sanity check */
1692 total = 2;
1693 if (add < del) {
1694 add = scale_linear(add, graph_width, max_change);
1695 del = total - add;
1696 } else {
1697 del = scale_linear(del, graph_width, max_change);
1698 add = total - del;
1699 }
1700 }
1701 fprintf(options->file, "%s", line_prefix);
1702 show_name(options->file, prefix, name, len);
1703 fprintf(options->file, " %*"PRIuMAX"%s",
1704 number_width, added + deleted,
1705 added + deleted ? " " : "");
1706 show_graph(options->file, '+', add, add_c, reset);
1707 show_graph(options->file, '-', del, del_c, reset);
1708 fprintf(options->file, "\n");
1709 }
1710
1711 for (i = 0; i < data->nr; i++) {
1712 struct diffstat_file *file = data->files[i];
1713 uintmax_t added = file->added;
1714 uintmax_t deleted = file->deleted;
1715
1716 if (file->is_unmerged ||
1717 (!file->is_interesting && (added + deleted == 0))) {
1718 total_files--;
1719 continue;
1720 }
1721
1722 if (!file->is_binary) {
1723 adds += added;
1724 dels += deleted;
1725 }
1726 if (i < count)
1727 continue;
1728 if (!extra_shown)
1729 fprintf(options->file, "%s ...\n", line_prefix);
1730 extra_shown = 1;
1731 }
1732 fprintf(options->file, "%s", line_prefix);
1733 print_stat_summary(options->file, total_files, adds, dels);
1734 }
1735
1736 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1737 {
1738 int i, adds = 0, dels = 0, total_files = data->nr;
1739
1740 if (data->nr == 0)
1741 return;
1742
1743 for (i = 0; i < data->nr; i++) {
1744 int added = data->files[i]->added;
1745 int deleted= data->files[i]->deleted;
1746
1747 if (data->files[i]->is_unmerged ||
1748 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1749 total_files--;
1750 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1751 adds += added;
1752 dels += deleted;
1753 }
1754 }
1755 fprintf(options->file, "%s", diff_line_prefix(options));
1756 print_stat_summary(options->file, total_files, adds, dels);
1757 }
1758
1759 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1760 {
1761 int i;
1762
1763 if (data->nr == 0)
1764 return;
1765
1766 for (i = 0; i < data->nr; i++) {
1767 struct diffstat_file *file = data->files[i];
1768
1769 fprintf(options->file, "%s", diff_line_prefix(options));
1770
1771 if (file->is_binary)
1772 fprintf(options->file, "-\t-\t");
1773 else
1774 fprintf(options->file,
1775 "%"PRIuMAX"\t%"PRIuMAX"\t",
1776 file->added, file->deleted);
1777 if (options->line_termination) {
1778 fill_print_name(file);
1779 if (!file->is_renamed)
1780 write_name_quoted(file->name, options->file,
1781 options->line_termination);
1782 else {
1783 fputs(file->print_name, options->file);
1784 putc(options->line_termination, options->file);
1785 }
1786 } else {
1787 if (file->is_renamed) {
1788 putc('\0', options->file);
1789 write_name_quoted(file->from_name, options->file, '\0');
1790 }
1791 write_name_quoted(file->name, options->file, '\0');
1792 }
1793 }
1794 }
1795
1796 struct dirstat_file {
1797 const char *name;
1798 unsigned long changed;
1799 };
1800
1801 struct dirstat_dir {
1802 struct dirstat_file *files;
1803 int alloc, nr, permille, cumulative;
1804 };
1805
1806 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1807 unsigned long changed, const char *base, int baselen)
1808 {
1809 unsigned long this_dir = 0;
1810 unsigned int sources = 0;
1811 const char *line_prefix = diff_line_prefix(opt);
1812
1813 while (dir->nr) {
1814 struct dirstat_file *f = dir->files;
1815 int namelen = strlen(f->name);
1816 unsigned long this;
1817 char *slash;
1818
1819 if (namelen < baselen)
1820 break;
1821 if (memcmp(f->name, base, baselen))
1822 break;
1823 slash = strchr(f->name + baselen, '/');
1824 if (slash) {
1825 int newbaselen = slash + 1 - f->name;
1826 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1827 sources++;
1828 } else {
1829 this = f->changed;
1830 dir->files++;
1831 dir->nr--;
1832 sources += 2;
1833 }
1834 this_dir += this;
1835 }
1836
1837 /*
1838 * We don't report dirstat's for
1839 * - the top level
1840 * - or cases where everything came from a single directory
1841 * under this directory (sources == 1).
1842 */
1843 if (baselen && sources != 1) {
1844 if (this_dir) {
1845 int permille = this_dir * 1000 / changed;
1846 if (permille >= dir->permille) {
1847 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1848 permille / 10, permille % 10, baselen, base);
1849 if (!dir->cumulative)
1850 return 0;
1851 }
1852 }
1853 }
1854 return this_dir;
1855 }
1856
1857 static int dirstat_compare(const void *_a, const void *_b)
1858 {
1859 const struct dirstat_file *a = _a;
1860 const struct dirstat_file *b = _b;
1861 return strcmp(a->name, b->name);
1862 }
1863
1864 static void show_dirstat(struct diff_options *options)
1865 {
1866 int i;
1867 unsigned long changed;
1868 struct dirstat_dir dir;
1869 struct diff_queue_struct *q = &diff_queued_diff;
1870
1871 dir.files = NULL;
1872 dir.alloc = 0;
1873 dir.nr = 0;
1874 dir.permille = options->dirstat_permille;
1875 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1876
1877 changed = 0;
1878 for (i = 0; i < q->nr; i++) {
1879 struct diff_filepair *p = q->queue[i];
1880 const char *name;
1881 unsigned long copied, added, damage;
1882 int content_changed;
1883
1884 name = p->two->path ? p->two->path : p->one->path;
1885
1886 if (p->one->sha1_valid && p->two->sha1_valid)
1887 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1888 else
1889 content_changed = 1;
1890
1891 if (!content_changed) {
1892 /*
1893 * The SHA1 has not changed, so pre-/post-content is
1894 * identical. We can therefore skip looking at the
1895 * file contents altogether.
1896 */
1897 damage = 0;
1898 goto found_damage;
1899 }
1900
1901 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1902 /*
1903 * In --dirstat-by-file mode, we don't really need to
1904 * look at the actual file contents at all.
1905 * The fact that the SHA1 changed is enough for us to
1906 * add this file to the list of results
1907 * (with each file contributing equal damage).
1908 */
1909 damage = 1;
1910 goto found_damage;
1911 }
1912
1913 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1914 diff_populate_filespec(p->one, 0);
1915 diff_populate_filespec(p->two, 0);
1916 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1917 &copied, &added);
1918 diff_free_filespec_data(p->one);
1919 diff_free_filespec_data(p->two);
1920 } else if (DIFF_FILE_VALID(p->one)) {
1921 diff_populate_filespec(p->one, 1);
1922 copied = added = 0;
1923 diff_free_filespec_data(p->one);
1924 } else if (DIFF_FILE_VALID(p->two)) {
1925 diff_populate_filespec(p->two, 1);
1926 copied = 0;
1927 added = p->two->size;
1928 diff_free_filespec_data(p->two);
1929 } else
1930 continue;
1931
1932 /*
1933 * Original minus copied is the removed material,
1934 * added is the new material. They are both damages
1935 * made to the preimage.
1936 * If the resulting damage is zero, we know that
1937 * diffcore_count_changes() considers the two entries to
1938 * be identical, but since content_changed is true, we
1939 * know that there must have been _some_ kind of change,
1940 * so we force all entries to have damage > 0.
1941 */
1942 damage = (p->one->size - copied) + added;
1943 if (!damage)
1944 damage = 1;
1945
1946 found_damage:
1947 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1948 dir.files[dir.nr].name = name;
1949 dir.files[dir.nr].changed = damage;
1950 changed += damage;
1951 dir.nr++;
1952 }
1953
1954 /* This can happen even with many files, if everything was renames */
1955 if (!changed)
1956 return;
1957
1958 /* Show all directories with more than x% of the changes */
1959 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1960 gather_dirstat(options, &dir, changed, "", 0);
1961 }
1962
1963 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1964 {
1965 int i;
1966 unsigned long changed;
1967 struct dirstat_dir dir;
1968
1969 if (data->nr == 0)
1970 return;
1971
1972 dir.files = NULL;
1973 dir.alloc = 0;
1974 dir.nr = 0;
1975 dir.permille = options->dirstat_permille;
1976 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1977
1978 changed = 0;
1979 for (i = 0; i < data->nr; i++) {
1980 struct diffstat_file *file = data->files[i];
1981 unsigned long damage = file->added + file->deleted;
1982 if (file->is_binary)
1983 /*
1984 * binary files counts bytes, not lines. Must find some
1985 * way to normalize binary bytes vs. textual lines.
1986 * The following heuristic assumes that there are 64
1987 * bytes per "line".
1988 * This is stupid and ugly, but very cheap...
1989 */
1990 damage = (damage + 63) / 64;
1991 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1992 dir.files[dir.nr].name = file->name;
1993 dir.files[dir.nr].changed = damage;
1994 changed += damage;
1995 dir.nr++;
1996 }
1997
1998 /* This can happen even with many files, if everything was renames */
1999 if (!changed)
2000 return;
2001
2002 /* Show all directories with more than x% of the changes */
2003 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2004 gather_dirstat(options, &dir, changed, "", 0);
2005 }
2006
2007 static void free_diffstat_info(struct diffstat_t *diffstat)
2008 {
2009 int i;
2010 for (i = 0; i < diffstat->nr; i++) {
2011 struct diffstat_file *f = diffstat->files[i];
2012 if (f->name != f->print_name)
2013 free(f->print_name);
2014 free(f->name);
2015 free(f->from_name);
2016 free(f);
2017 }
2018 free(diffstat->files);
2019 }
2020
2021 struct checkdiff_t {
2022 const char *filename;
2023 int lineno;
2024 int conflict_marker_size;
2025 struct diff_options *o;
2026 unsigned ws_rule;
2027 unsigned status;
2028 };
2029
2030 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2031 {
2032 char firstchar;
2033 int cnt;
2034
2035 if (len < marker_size + 1)
2036 return 0;
2037 firstchar = line[0];
2038 switch (firstchar) {
2039 case '=': case '>': case '<': case '|':
2040 break;
2041 default:
2042 return 0;
2043 }
2044 for (cnt = 1; cnt < marker_size; cnt++)
2045 if (line[cnt] != firstchar)
2046 return 0;
2047 /* line[1] thru line[marker_size-1] are same as firstchar */
2048 if (len < marker_size + 1 || !isspace(line[marker_size]))
2049 return 0;
2050 return 1;
2051 }
2052
2053 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2054 {
2055 struct checkdiff_t *data = priv;
2056 int marker_size = data->conflict_marker_size;
2057 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2058 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2059 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2060 char *err;
2061 const char *line_prefix;
2062
2063 assert(data->o);
2064 line_prefix = diff_line_prefix(data->o);
2065
2066 if (line[0] == '+') {
2067 unsigned bad;
2068 data->lineno++;
2069 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2070 data->status |= 1;
2071 fprintf(data->o->file,
2072 "%s%s:%d: leftover conflict marker\n",
2073 line_prefix, data->filename, data->lineno);
2074 }
2075 bad = ws_check(line + 1, len - 1, data->ws_rule);
2076 if (!bad)
2077 return;
2078 data->status |= bad;
2079 err = whitespace_error_string(bad);
2080 fprintf(data->o->file, "%s%s:%d: %s.\n",
2081 line_prefix, data->filename, data->lineno, err);
2082 free(err);
2083 emit_line(data->o, set, reset, line, 1);
2084 ws_check_emit(line + 1, len - 1, data->ws_rule,
2085 data->o->file, set, reset, ws);
2086 } else if (line[0] == ' ') {
2087 data->lineno++;
2088 } else if (line[0] == '@') {
2089 char *plus = strchr(line, '+');
2090 if (plus)
2091 data->lineno = strtol(plus, NULL, 10) - 1;
2092 else
2093 die("invalid diff");
2094 }
2095 }
2096
2097 static unsigned char *deflate_it(char *data,
2098 unsigned long size,
2099 unsigned long *result_size)
2100 {
2101 int bound;
2102 unsigned char *deflated;
2103 git_zstream stream;
2104
2105 memset(&stream, 0, sizeof(stream));
2106 git_deflate_init(&stream, zlib_compression_level);
2107 bound = git_deflate_bound(&stream, size);
2108 deflated = xmalloc(bound);
2109 stream.next_out = deflated;
2110 stream.avail_out = bound;
2111
2112 stream.next_in = (unsigned char *)data;
2113 stream.avail_in = size;
2114 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2115 ; /* nothing */
2116 git_deflate_end(&stream);
2117 *result_size = stream.total_out;
2118 return deflated;
2119 }
2120
2121 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2122 const char *prefix)
2123 {
2124 void *cp;
2125 void *delta;
2126 void *deflated;
2127 void *data;
2128 unsigned long orig_size;
2129 unsigned long delta_size;
2130 unsigned long deflate_size;
2131 unsigned long data_size;
2132
2133 /* We could do deflated delta, or we could do just deflated two,
2134 * whichever is smaller.
2135 */
2136 delta = NULL;
2137 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2138 if (one->size && two->size) {
2139 delta = diff_delta(one->ptr, one->size,
2140 two->ptr, two->size,
2141 &delta_size, deflate_size);
2142 if (delta) {
2143 void *to_free = delta;
2144 orig_size = delta_size;
2145 delta = deflate_it(delta, delta_size, &delta_size);
2146 free(to_free);
2147 }
2148 }
2149
2150 if (delta && delta_size < deflate_size) {
2151 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2152 free(deflated);
2153 data = delta;
2154 data_size = delta_size;
2155 }
2156 else {
2157 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2158 free(delta);
2159 data = deflated;
2160 data_size = deflate_size;
2161 }
2162
2163 /* emit data encoded in base85 */
2164 cp = data;
2165 while (data_size) {
2166 int bytes = (52 < data_size) ? 52 : data_size;
2167 char line[70];
2168 data_size -= bytes;
2169 if (bytes <= 26)
2170 line[0] = bytes + 'A' - 1;
2171 else
2172 line[0] = bytes - 26 + 'a' - 1;
2173 encode_85(line + 1, cp, bytes);
2174 cp = (char *) cp + bytes;
2175 fprintf(file, "%s", prefix);
2176 fputs(line, file);
2177 fputc('\n', file);
2178 }
2179 fprintf(file, "%s\n", prefix);
2180 free(data);
2181 }
2182
2183 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2184 const char *prefix)
2185 {
2186 fprintf(file, "%sGIT binary patch\n", prefix);
2187 emit_binary_diff_body(file, one, two, prefix);
2188 emit_binary_diff_body(file, two, one, prefix);
2189 }
2190
2191 int diff_filespec_is_binary(struct diff_filespec *one)
2192 {
2193 if (one->is_binary == -1) {
2194 diff_filespec_load_driver(one);
2195 if (one->driver->binary != -1)
2196 one->is_binary = one->driver->binary;
2197 else {
2198 if (!one->data && DIFF_FILE_VALID(one))
2199 diff_populate_filespec(one, 0);
2200 if (one->data)
2201 one->is_binary = buffer_is_binary(one->data,
2202 one->size);
2203 if (one->is_binary == -1)
2204 one->is_binary = 0;
2205 }
2206 }
2207 return one->is_binary;
2208 }
2209
2210 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2211 {
2212 diff_filespec_load_driver(one);
2213 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2214 }
2215
2216 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2217 {
2218 if (!options->a_prefix)
2219 options->a_prefix = a;
2220 if (!options->b_prefix)
2221 options->b_prefix = b;
2222 }
2223
2224 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2225 {
2226 if (!DIFF_FILE_VALID(one))
2227 return NULL;
2228
2229 diff_filespec_load_driver(one);
2230 return userdiff_get_textconv(one->driver);
2231 }
2232
2233 static void builtin_diff(const char *name_a,
2234 const char *name_b,
2235 struct diff_filespec *one,
2236 struct diff_filespec *two,
2237 const char *xfrm_msg,
2238 int must_show_header,
2239 struct diff_options *o,
2240 int complete_rewrite)
2241 {
2242 mmfile_t mf1, mf2;
2243 const char *lbl[2];
2244 char *a_one, *b_two;
2245 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2246 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2247 const char *a_prefix, *b_prefix;
2248 struct userdiff_driver *textconv_one = NULL;
2249 struct userdiff_driver *textconv_two = NULL;
2250 struct strbuf header = STRBUF_INIT;
2251 const char *line_prefix = diff_line_prefix(o);
2252
2253 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2254 (!one->mode || S_ISGITLINK(one->mode)) &&
2255 (!two->mode || S_ISGITLINK(two->mode))) {
2256 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2257 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2258 show_submodule_summary(o->file, one->path ? one->path : two->path,
2259 line_prefix,
2260 one->sha1, two->sha1, two->dirty_submodule,
2261 meta, del, add, reset);
2262 return;
2263 }
2264
2265 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2266 textconv_one = get_textconv(one);
2267 textconv_two = get_textconv(two);
2268 }
2269
2270 diff_set_mnemonic_prefix(o, "a/", "b/");
2271 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2272 a_prefix = o->b_prefix;
2273 b_prefix = o->a_prefix;
2274 } else {
2275 a_prefix = o->a_prefix;
2276 b_prefix = o->b_prefix;
2277 }
2278
2279 /* Never use a non-valid filename anywhere if at all possible */
2280 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2281 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2282
2283 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2284 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2285 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2286 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2287 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2288 if (lbl[0][0] == '/') {
2289 /* /dev/null */
2290 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2291 if (xfrm_msg)
2292 strbuf_addstr(&header, xfrm_msg);
2293 must_show_header = 1;
2294 }
2295 else if (lbl[1][0] == '/') {
2296 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2297 if (xfrm_msg)
2298 strbuf_addstr(&header, xfrm_msg);
2299 must_show_header = 1;
2300 }
2301 else {
2302 if (one->mode != two->mode) {
2303 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2304 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2305 must_show_header = 1;
2306 }
2307 if (xfrm_msg)
2308 strbuf_addstr(&header, xfrm_msg);
2309
2310 /*
2311 * we do not run diff between different kind
2312 * of objects.
2313 */
2314 if ((one->mode ^ two->mode) & S_IFMT)
2315 goto free_ab_and_return;
2316 if (complete_rewrite &&
2317 (textconv_one || !diff_filespec_is_binary(one)) &&
2318 (textconv_two || !diff_filespec_is_binary(two))) {
2319 fprintf(o->file, "%s", header.buf);
2320 strbuf_reset(&header);
2321 emit_rewrite_diff(name_a, name_b, one, two,
2322 textconv_one, textconv_two, o);
2323 o->found_changes = 1;
2324 goto free_ab_and_return;
2325 }
2326 }
2327
2328 if (o->irreversible_delete && lbl[1][0] == '/') {
2329 fprintf(o->file, "%s", header.buf);
2330 strbuf_reset(&header);
2331 goto free_ab_and_return;
2332 } else if (!DIFF_OPT_TST(o, TEXT) &&
2333 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2334 (!textconv_two && diff_filespec_is_binary(two)) )) {
2335 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2336 die("unable to read files to diff");
2337 /* Quite common confusing case */
2338 if (mf1.size == mf2.size &&
2339 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2340 if (must_show_header)
2341 fprintf(o->file, "%s", header.buf);
2342 goto free_ab_and_return;
2343 }
2344 fprintf(o->file, "%s", header.buf);
2345 strbuf_reset(&header);
2346 if (DIFF_OPT_TST(o, BINARY))
2347 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2348 else
2349 fprintf(o->file, "%sBinary files %s and %s differ\n",
2350 line_prefix, lbl[0], lbl[1]);
2351 o->found_changes = 1;
2352 } else {
2353 /* Crazy xdl interfaces.. */
2354 const char *diffopts = getenv("GIT_DIFF_OPTS");
2355 xpparam_t xpp;
2356 xdemitconf_t xecfg;
2357 struct emit_callback ecbdata;
2358 const struct userdiff_funcname *pe;
2359
2360 if (must_show_header) {
2361 fprintf(o->file, "%s", header.buf);
2362 strbuf_reset(&header);
2363 }
2364
2365 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2366 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2367
2368 pe = diff_funcname_pattern(one);
2369 if (!pe)
2370 pe = diff_funcname_pattern(two);
2371
2372 memset(&xpp, 0, sizeof(xpp));
2373 memset(&xecfg, 0, sizeof(xecfg));
2374 memset(&ecbdata, 0, sizeof(ecbdata));
2375 ecbdata.label_path = lbl;
2376 ecbdata.color_diff = want_color(o->use_color);
2377 ecbdata.found_changesp = &o->found_changes;
2378 ecbdata.ws_rule = whitespace_rule(name_b);
2379 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2380 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2381 ecbdata.opt = o;
2382 ecbdata.header = header.len ? &header : NULL;
2383 xpp.flags = o->xdl_opts;
2384 xecfg.ctxlen = o->context;
2385 xecfg.interhunkctxlen = o->interhunkcontext;
2386 xecfg.flags = XDL_EMIT_FUNCNAMES;
2387 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2388 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2389 if (pe)
2390 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2391 if (!diffopts)
2392 ;
2393 else if (starts_with(diffopts, "--unified="))
2394 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2395 else if (starts_with(diffopts, "-u"))
2396 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2397 if (o->word_diff)
2398 init_diff_words_data(&ecbdata, o, one, two);
2399 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2400 &xpp, &xecfg);
2401 if (o->word_diff)
2402 free_diff_words_data(&ecbdata);
2403 if (textconv_one)
2404 free(mf1.ptr);
2405 if (textconv_two)
2406 free(mf2.ptr);
2407 xdiff_clear_find_func(&xecfg);
2408 }
2409
2410 free_ab_and_return:
2411 strbuf_release(&header);
2412 diff_free_filespec_data(one);
2413 diff_free_filespec_data(two);
2414 free(a_one);
2415 free(b_two);
2416 return;
2417 }
2418
2419 static void builtin_diffstat(const char *name_a, const char *name_b,
2420 struct diff_filespec *one,
2421 struct diff_filespec *two,
2422 struct diffstat_t *diffstat,
2423 struct diff_options *o,
2424 struct diff_filepair *p)
2425 {
2426 mmfile_t mf1, mf2;
2427 struct diffstat_file *data;
2428 int same_contents;
2429 int complete_rewrite = 0;
2430
2431 if (!DIFF_PAIR_UNMERGED(p)) {
2432 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2433 complete_rewrite = 1;
2434 }
2435
2436 data = diffstat_add(diffstat, name_a, name_b);
2437 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2438
2439 if (!one || !two) {
2440 data->is_unmerged = 1;
2441 return;
2442 }
2443
2444 same_contents = !hashcmp(one->sha1, two->sha1);
2445
2446 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2447 data->is_binary = 1;
2448 if (same_contents) {
2449 data->added = 0;
2450 data->deleted = 0;
2451 } else {
2452 data->added = diff_filespec_size(two);
2453 data->deleted = diff_filespec_size(one);
2454 }
2455 }
2456
2457 else if (complete_rewrite) {
2458 diff_populate_filespec(one, 0);
2459 diff_populate_filespec(two, 0);
2460 data->deleted = count_lines(one->data, one->size);
2461 data->added = count_lines(two->data, two->size);
2462 }
2463
2464 else if (!same_contents) {
2465 /* Crazy xdl interfaces.. */
2466 xpparam_t xpp;
2467 xdemitconf_t xecfg;
2468
2469 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2470 die("unable to read files to diff");
2471
2472 memset(&xpp, 0, sizeof(xpp));
2473 memset(&xecfg, 0, sizeof(xecfg));
2474 xpp.flags = o->xdl_opts;
2475 xecfg.ctxlen = o->context;
2476 xecfg.interhunkctxlen = o->interhunkcontext;
2477 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2478 &xpp, &xecfg);
2479 }
2480
2481 diff_free_filespec_data(one);
2482 diff_free_filespec_data(two);
2483 }
2484
2485 static void builtin_checkdiff(const char *name_a, const char *name_b,
2486 const char *attr_path,
2487 struct diff_filespec *one,
2488 struct diff_filespec *two,
2489 struct diff_options *o)
2490 {
2491 mmfile_t mf1, mf2;
2492 struct checkdiff_t data;
2493
2494 if (!two)
2495 return;
2496
2497 memset(&data, 0, sizeof(data));
2498 data.filename = name_b ? name_b : name_a;
2499 data.lineno = 0;
2500 data.o = o;
2501 data.ws_rule = whitespace_rule(attr_path);
2502 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2503
2504 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2505 die("unable to read files to diff");
2506
2507 /*
2508 * All the other codepaths check both sides, but not checking
2509 * the "old" side here is deliberate. We are checking the newly
2510 * introduced changes, and as long as the "new" side is text, we
2511 * can and should check what it introduces.
2512 */
2513 if (diff_filespec_is_binary(two))
2514 goto free_and_return;
2515 else {
2516 /* Crazy xdl interfaces.. */
2517 xpparam_t xpp;
2518 xdemitconf_t xecfg;
2519
2520 memset(&xpp, 0, sizeof(xpp));
2521 memset(&xecfg, 0, sizeof(xecfg));
2522 xecfg.ctxlen = 1; /* at least one context line */
2523 xpp.flags = 0;
2524 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2525 &xpp, &xecfg);
2526
2527 if (data.ws_rule & WS_BLANK_AT_EOF) {
2528 struct emit_callback ecbdata;
2529 int blank_at_eof;
2530
2531 ecbdata.ws_rule = data.ws_rule;
2532 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2533 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2534
2535 if (blank_at_eof) {
2536 static char *err;
2537 if (!err)
2538 err = whitespace_error_string(WS_BLANK_AT_EOF);
2539 fprintf(o->file, "%s:%d: %s.\n",
2540 data.filename, blank_at_eof, err);
2541 data.status = 1; /* report errors */
2542 }
2543 }
2544 }
2545 free_and_return:
2546 diff_free_filespec_data(one);
2547 diff_free_filespec_data(two);
2548 if (data.status)
2549 DIFF_OPT_SET(o, CHECK_FAILED);
2550 }
2551
2552 struct diff_filespec *alloc_filespec(const char *path)
2553 {
2554 int namelen = strlen(path);
2555 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2556
2557 memset(spec, 0, sizeof(*spec));
2558 spec->path = (char *)(spec + 1);
2559 memcpy(spec->path, path, namelen+1);
2560 spec->count = 1;
2561 spec->is_binary = -1;
2562 return spec;
2563 }
2564
2565 void free_filespec(struct diff_filespec *spec)
2566 {
2567 if (!--spec->count) {
2568 diff_free_filespec_data(spec);
2569 free(spec);
2570 }
2571 }
2572
2573 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2574 int sha1_valid, unsigned short mode)
2575 {
2576 if (mode) {
2577 spec->mode = canon_mode(mode);
2578 hashcpy(spec->sha1, sha1);
2579 spec->sha1_valid = sha1_valid;
2580 }
2581 }
2582
2583 /*
2584 * Given a name and sha1 pair, if the index tells us the file in
2585 * the work tree has that object contents, return true, so that
2586 * prepare_temp_file() does not have to inflate and extract.
2587 */
2588 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2589 {
2590 const struct cache_entry *ce;
2591 struct stat st;
2592 int pos, len;
2593
2594 /*
2595 * We do not read the cache ourselves here, because the
2596 * benchmark with my previous version that always reads cache
2597 * shows that it makes things worse for diff-tree comparing
2598 * two linux-2.6 kernel trees in an already checked out work
2599 * tree. This is because most diff-tree comparisons deal with
2600 * only a small number of files, while reading the cache is
2601 * expensive for a large project, and its cost outweighs the
2602 * savings we get by not inflating the object to a temporary
2603 * file. Practically, this code only helps when we are used
2604 * by diff-cache --cached, which does read the cache before
2605 * calling us.
2606 */
2607 if (!active_cache)
2608 return 0;
2609
2610 /* We want to avoid the working directory if our caller
2611 * doesn't need the data in a normal file, this system
2612 * is rather slow with its stat/open/mmap/close syscalls,
2613 * and the object is contained in a pack file. The pack
2614 * is probably already open and will be faster to obtain
2615 * the data through than the working directory. Loose
2616 * objects however would tend to be slower as they need
2617 * to be individually opened and inflated.
2618 */
2619 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2620 return 0;
2621
2622 len = strlen(name);
2623 pos = cache_name_pos(name, len);
2624 if (pos < 0)
2625 return 0;
2626 ce = active_cache[pos];
2627
2628 /*
2629 * This is not the sha1 we are looking for, or
2630 * unreusable because it is not a regular file.
2631 */
2632 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2633 return 0;
2634
2635 /*
2636 * If ce is marked as "assume unchanged", there is no
2637 * guarantee that work tree matches what we are looking for.
2638 */
2639 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2640 return 0;
2641
2642 /*
2643 * If ce matches the file in the work tree, we can reuse it.
2644 */
2645 if (ce_uptodate(ce) ||
2646 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2647 return 1;
2648
2649 return 0;
2650 }
2651
2652 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2653 {
2654 int len;
2655 char *data = xmalloc(100), *dirty = "";
2656
2657 /* Are we looking at the work tree? */
2658 if (s->dirty_submodule)
2659 dirty = "-dirty";
2660
2661 len = snprintf(data, 100,
2662 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2663 s->data = data;
2664 s->size = len;
2665 s->should_free = 1;
2666 if (size_only) {
2667 s->data = NULL;
2668 free(data);
2669 }
2670 return 0;
2671 }
2672
2673 /*
2674 * While doing rename detection and pickaxe operation, we may need to
2675 * grab the data for the blob (or file) for our own in-core comparison.
2676 * diff_filespec has data and size fields for this purpose.
2677 */
2678 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2679 {
2680 int err = 0;
2681 /*
2682 * demote FAIL to WARN to allow inspecting the situation
2683 * instead of refusing.
2684 */
2685 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2686 ? SAFE_CRLF_WARN
2687 : safe_crlf);
2688
2689 if (!DIFF_FILE_VALID(s))
2690 die("internal error: asking to populate invalid file.");
2691 if (S_ISDIR(s->mode))
2692 return -1;
2693
2694 if (s->data)
2695 return 0;
2696
2697 if (size_only && 0 < s->size)
2698 return 0;
2699
2700 if (S_ISGITLINK(s->mode))
2701 return diff_populate_gitlink(s, size_only);
2702
2703 if (!s->sha1_valid ||
2704 reuse_worktree_file(s->path, s->sha1, 0)) {
2705 struct strbuf buf = STRBUF_INIT;
2706 struct stat st;
2707 int fd;
2708
2709 if (lstat(s->path, &st) < 0) {
2710 if (errno == ENOENT) {
2711 err_empty:
2712 err = -1;
2713 empty:
2714 s->data = (char *)"";
2715 s->size = 0;
2716 return err;
2717 }
2718 }
2719 s->size = xsize_t(st.st_size);
2720 if (!s->size)
2721 goto empty;
2722 if (S_ISLNK(st.st_mode)) {
2723 struct strbuf sb = STRBUF_INIT;
2724
2725 if (strbuf_readlink(&sb, s->path, s->size))
2726 goto err_empty;
2727 s->size = sb.len;
2728 s->data = strbuf_detach(&sb, NULL);
2729 s->should_free = 1;
2730 return 0;
2731 }
2732 if (size_only)
2733 return 0;
2734 fd = open(s->path, O_RDONLY);
2735 if (fd < 0)
2736 goto err_empty;
2737 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2738 close(fd);
2739 s->should_munmap = 1;
2740
2741 /*
2742 * Convert from working tree format to canonical git format
2743 */
2744 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2745 size_t size = 0;
2746 munmap(s->data, s->size);
2747 s->should_munmap = 0;
2748 s->data = strbuf_detach(&buf, &size);
2749 s->size = size;
2750 s->should_free = 1;
2751 }
2752 }
2753 else {
2754 enum object_type type;
2755 if (size_only) {
2756 type = sha1_object_info(s->sha1, &s->size);
2757 if (type < 0)
2758 die("unable to read %s", sha1_to_hex(s->sha1));
2759 } else {
2760 s->data = read_sha1_file(s->sha1, &type, &s->size);
2761 if (!s->data)
2762 die("unable to read %s", sha1_to_hex(s->sha1));
2763 s->should_free = 1;
2764 }
2765 }
2766 return 0;
2767 }
2768
2769 void diff_free_filespec_blob(struct diff_filespec *s)
2770 {
2771 if (s->should_free)
2772 free(s->data);
2773 else if (s->should_munmap)
2774 munmap(s->data, s->size);
2775
2776 if (s->should_free || s->should_munmap) {
2777 s->should_free = s->should_munmap = 0;
2778 s->data = NULL;
2779 }
2780 }
2781
2782 void diff_free_filespec_data(struct diff_filespec *s)
2783 {
2784 diff_free_filespec_blob(s);
2785 free(s->cnt_data);
2786 s->cnt_data = NULL;
2787 }
2788
2789 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2790 void *blob,
2791 unsigned long size,
2792 const unsigned char *sha1,
2793 int mode)
2794 {
2795 int fd;
2796 struct strbuf buf = STRBUF_INIT;
2797 struct strbuf template = STRBUF_INIT;
2798 char *path_dup = xstrdup(path);
2799 const char *base = basename(path_dup);
2800
2801 /* Generate "XXXXXX_basename.ext" */
2802 strbuf_addstr(&template, "XXXXXX_");
2803 strbuf_addstr(&template, base);
2804
2805 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2806 strlen(base) + 1);
2807 if (fd < 0)
2808 die_errno("unable to create temp-file");
2809 if (convert_to_working_tree(path,
2810 (const char *)blob, (size_t)size, &buf)) {
2811 blob = buf.buf;
2812 size = buf.len;
2813 }
2814 if (write_in_full(fd, blob, size) != size)
2815 die_errno("unable to write temp-file");
2816 close(fd);
2817 temp->name = temp->tmp_path;
2818 strcpy(temp->hex, sha1_to_hex(sha1));
2819 temp->hex[40] = 0;
2820 sprintf(temp->mode, "%06o", mode);
2821 strbuf_release(&buf);
2822 strbuf_release(&template);
2823 free(path_dup);
2824 }
2825
2826 static struct diff_tempfile *prepare_temp_file(const char *name,
2827 struct diff_filespec *one)
2828 {
2829 struct diff_tempfile *temp = claim_diff_tempfile();
2830
2831 if (!DIFF_FILE_VALID(one)) {
2832 not_a_valid_file:
2833 /* A '-' entry produces this for file-2, and
2834 * a '+' entry produces this for file-1.
2835 */
2836 temp->name = "/dev/null";
2837 strcpy(temp->hex, ".");
2838 strcpy(temp->mode, ".");
2839 return temp;
2840 }
2841
2842 if (!remove_tempfile_installed) {
2843 atexit(remove_tempfile);
2844 sigchain_push_common(remove_tempfile_on_signal);
2845 remove_tempfile_installed = 1;
2846 }
2847
2848 if (!S_ISGITLINK(one->mode) &&
2849 (!one->sha1_valid ||
2850 reuse_worktree_file(name, one->sha1, 1))) {
2851 struct stat st;
2852 if (lstat(name, &st) < 0) {
2853 if (errno == ENOENT)
2854 goto not_a_valid_file;
2855 die_errno("stat(%s)", name);
2856 }
2857 if (S_ISLNK(st.st_mode)) {
2858 struct strbuf sb = STRBUF_INIT;
2859 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2860 die_errno("readlink(%s)", name);
2861 prep_temp_blob(name, temp, sb.buf, sb.len,
2862 (one->sha1_valid ?
2863 one->sha1 : null_sha1),
2864 (one->sha1_valid ?
2865 one->mode : S_IFLNK));
2866 strbuf_release(&sb);
2867 }
2868 else {
2869 /* we can borrow from the file in the work tree */
2870 temp->name = name;
2871 if (!one->sha1_valid)
2872 strcpy(temp->hex, sha1_to_hex(null_sha1));
2873 else
2874 strcpy(temp->hex, sha1_to_hex(one->sha1));
2875 /* Even though we may sometimes borrow the
2876 * contents from the work tree, we always want
2877 * one->mode. mode is trustworthy even when
2878 * !(one->sha1_valid), as long as
2879 * DIFF_FILE_VALID(one).
2880 */
2881 sprintf(temp->mode, "%06o", one->mode);
2882 }
2883 return temp;
2884 }
2885 else {
2886 if (diff_populate_filespec(one, 0))
2887 die("cannot read data blob for %s", one->path);
2888 prep_temp_blob(name, temp, one->data, one->size,
2889 one->sha1, one->mode);
2890 }
2891 return temp;
2892 }
2893
2894 /* An external diff command takes:
2895 *
2896 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2897 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2898 *
2899 */
2900 static void run_external_diff(const char *pgm,
2901 const char *name,
2902 const char *other,
2903 struct diff_filespec *one,
2904 struct diff_filespec *two,
2905 const char *xfrm_msg,
2906 int complete_rewrite,
2907 struct diff_options *o)
2908 {
2909 const char *spawn_arg[10];
2910 int retval;
2911 const char **arg = &spawn_arg[0];
2912 struct diff_queue_struct *q = &diff_queued_diff;
2913 const char *env[3] = { NULL };
2914 char env_counter[50];
2915 char env_total[50];
2916
2917 if (one && two) {
2918 struct diff_tempfile *temp_one, *temp_two;
2919 const char *othername = (other ? other : name);
2920 temp_one = prepare_temp_file(name, one);
2921 temp_two = prepare_temp_file(othername, two);
2922 *arg++ = pgm;
2923 *arg++ = name;
2924 *arg++ = temp_one->name;
2925 *arg++ = temp_one->hex;
2926 *arg++ = temp_one->mode;
2927 *arg++ = temp_two->name;
2928 *arg++ = temp_two->hex;
2929 *arg++ = temp_two->mode;
2930 if (other) {
2931 *arg++ = other;
2932 *arg++ = xfrm_msg;
2933 }
2934 } else {
2935 *arg++ = pgm;
2936 *arg++ = name;
2937 }
2938 *arg = NULL;
2939 fflush(NULL);
2940
2941 env[0] = env_counter;
2942 snprintf(env_counter, sizeof(env_counter), "GIT_DIFF_PATH_COUNTER=%d",
2943 ++o->diff_path_counter);
2944 env[1] = env_total;
2945 snprintf(env_total, sizeof(env_total), "GIT_DIFF_PATH_TOTAL=%d", q->nr);
2946
2947 retval = run_command_v_opt_cd_env(spawn_arg, RUN_USING_SHELL, NULL, env);
2948 remove_tempfile();
2949 if (retval) {
2950 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2951 exit(1);
2952 }
2953 }
2954
2955 static int similarity_index(struct diff_filepair *p)
2956 {
2957 return p->score * 100 / MAX_SCORE;
2958 }
2959
2960 static void fill_metainfo(struct strbuf *msg,
2961 const char *name,
2962 const char *other,
2963 struct diff_filespec *one,
2964 struct diff_filespec *two,
2965 struct diff_options *o,
2966 struct diff_filepair *p,
2967 int *must_show_header,
2968 int use_color)
2969 {
2970 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2971 const char *reset = diff_get_color(use_color, DIFF_RESET);
2972 const char *line_prefix = diff_line_prefix(o);
2973
2974 *must_show_header = 1;
2975 strbuf_init(msg, PATH_MAX * 2 + 300);
2976 switch (p->status) {
2977 case DIFF_STATUS_COPIED:
2978 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2979 line_prefix, set, similarity_index(p));
2980 strbuf_addf(msg, "%s\n%s%scopy from ",
2981 reset, line_prefix, set);
2982 quote_c_style(name, msg, NULL, 0);
2983 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2984 quote_c_style(other, msg, NULL, 0);
2985 strbuf_addf(msg, "%s\n", reset);
2986 break;
2987 case DIFF_STATUS_RENAMED:
2988 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2989 line_prefix, set, similarity_index(p));
2990 strbuf_addf(msg, "%s\n%s%srename from ",
2991 reset, line_prefix, set);
2992 quote_c_style(name, msg, NULL, 0);
2993 strbuf_addf(msg, "%s\n%s%srename to ",
2994 reset, line_prefix, set);
2995 quote_c_style(other, msg, NULL, 0);
2996 strbuf_addf(msg, "%s\n", reset);
2997 break;
2998 case DIFF_STATUS_MODIFIED:
2999 if (p->score) {
3000 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3001 line_prefix,
3002 set, similarity_index(p), reset);
3003 break;
3004 }
3005 /* fallthru */
3006 default:
3007 *must_show_header = 0;
3008 }
3009 if (one && two && hashcmp(one->sha1, two->sha1)) {
3010 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3011
3012 if (DIFF_OPT_TST(o, BINARY)) {
3013 mmfile_t mf;
3014 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3015 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3016 abbrev = 40;
3017 }
3018 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3019 find_unique_abbrev(one->sha1, abbrev));
3020 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3021 if (one->mode == two->mode)
3022 strbuf_addf(msg, " %06o", one->mode);
3023 strbuf_addf(msg, "%s\n", reset);
3024 }
3025 }
3026
3027 static void run_diff_cmd(const char *pgm,
3028 const char *name,
3029 const char *other,
3030 const char *attr_path,
3031 struct diff_filespec *one,
3032 struct diff_filespec *two,
3033 struct strbuf *msg,
3034 struct diff_options *o,
3035 struct diff_filepair *p)
3036 {
3037 const char *xfrm_msg = NULL;
3038 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3039 int must_show_header = 0;
3040
3041
3042 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3043 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3044 if (drv && drv->external)
3045 pgm = drv->external;
3046 }
3047
3048 if (msg) {
3049 /*
3050 * don't use colors when the header is intended for an
3051 * external diff driver
3052 */
3053 fill_metainfo(msg, name, other, one, two, o, p,
3054 &must_show_header,
3055 want_color(o->use_color) && !pgm);
3056 xfrm_msg = msg->len ? msg->buf : NULL;
3057 }
3058
3059 if (pgm) {
3060 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3061 complete_rewrite, o);
3062 return;
3063 }
3064 if (one && two)
3065 builtin_diff(name, other ? other : name,
3066 one, two, xfrm_msg, must_show_header,
3067 o, complete_rewrite);
3068 else
3069 fprintf(o->file, "* Unmerged path %s\n", name);
3070 }
3071
3072 static void diff_fill_sha1_info(struct diff_filespec *one)
3073 {
3074 if (DIFF_FILE_VALID(one)) {
3075 if (!one->sha1_valid) {
3076 struct stat st;
3077 if (one->is_stdin) {
3078 hashcpy(one->sha1, null_sha1);
3079 return;
3080 }
3081 if (lstat(one->path, &st) < 0)
3082 die_errno("stat '%s'", one->path);
3083 if (index_path(one->sha1, one->path, &st, 0))
3084 die("cannot hash %s", one->path);
3085 }
3086 }
3087 else
3088 hashclr(one->sha1);
3089 }
3090
3091 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3092 {
3093 /* Strip the prefix but do not molest /dev/null and absolute paths */
3094 if (*namep && **namep != '/') {
3095 *namep += prefix_length;
3096 if (**namep == '/')
3097 ++*namep;
3098 }
3099 if (*otherp && **otherp != '/') {
3100 *otherp += prefix_length;
3101 if (**otherp == '/')
3102 ++*otherp;
3103 }
3104 }
3105
3106 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3107 {
3108 const char *pgm = external_diff();
3109 struct strbuf msg;
3110 struct diff_filespec *one = p->one;
3111 struct diff_filespec *two = p->two;
3112 const char *name;
3113 const char *other;
3114 const char *attr_path;
3115
3116 name = p->one->path;
3117 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3118 attr_path = name;
3119 if (o->prefix_length)
3120 strip_prefix(o->prefix_length, &name, &other);
3121
3122 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3123 pgm = NULL;
3124
3125 if (DIFF_PAIR_UNMERGED(p)) {
3126 run_diff_cmd(pgm, name, NULL, attr_path,
3127 NULL, NULL, NULL, o, p);
3128 return;
3129 }
3130
3131 diff_fill_sha1_info(one);
3132 diff_fill_sha1_info(two);
3133
3134 if (!pgm &&
3135 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3136 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3137 /*
3138 * a filepair that changes between file and symlink
3139 * needs to be split into deletion and creation.
3140 */
3141 struct diff_filespec *null = alloc_filespec(two->path);
3142 run_diff_cmd(NULL, name, other, attr_path,
3143 one, null, &msg, o, p);
3144 free(null);
3145 strbuf_release(&msg);
3146
3147 null = alloc_filespec(one->path);
3148 run_diff_cmd(NULL, name, other, attr_path,
3149 null, two, &msg, o, p);
3150 free(null);
3151 }
3152 else
3153 run_diff_cmd(pgm, name, other, attr_path,
3154 one, two, &msg, o, p);
3155
3156 strbuf_release(&msg);
3157 }
3158
3159 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3160 struct diffstat_t *diffstat)
3161 {
3162 const char *name;
3163 const char *other;
3164
3165 if (DIFF_PAIR_UNMERGED(p)) {
3166 /* unmerged */
3167 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3168 return;
3169 }
3170
3171 name = p->one->path;
3172 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3173
3174 if (o->prefix_length)
3175 strip_prefix(o->prefix_length, &name, &other);
3176
3177 diff_fill_sha1_info(p->one);
3178 diff_fill_sha1_info(p->two);
3179
3180 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3181 }
3182
3183 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3184 {
3185 const char *name;
3186 const char *other;
3187 const char *attr_path;
3188
3189 if (DIFF_PAIR_UNMERGED(p)) {
3190 /* unmerged */
3191 return;
3192 }
3193
3194 name = p->one->path;
3195 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3196 attr_path = other ? other : name;
3197
3198 if (o->prefix_length)
3199 strip_prefix(o->prefix_length, &name, &other);
3200
3201 diff_fill_sha1_info(p->one);
3202 diff_fill_sha1_info(p->two);
3203
3204 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3205 }
3206
3207 void diff_setup(struct diff_options *options)
3208 {
3209 memcpy(options, &default_diff_options, sizeof(*options));
3210
3211 options->file = stdout;
3212
3213 options->line_termination = '\n';
3214 options->break_opt = -1;
3215 options->rename_limit = -1;
3216 options->dirstat_permille = diff_dirstat_permille_default;
3217 options->context = diff_context_default;
3218 DIFF_OPT_SET(options, RENAME_EMPTY);
3219
3220 options->change = diff_change;
3221 options->add_remove = diff_addremove;
3222 options->use_color = diff_use_color_default;
3223 options->detect_rename = diff_detect_rename_default;
3224 options->xdl_opts |= diff_algorithm;
3225
3226 options->orderfile = diff_order_file_cfg;
3227
3228 if (diff_no_prefix) {
3229 options->a_prefix = options->b_prefix = "";
3230 } else if (!diff_mnemonic_prefix) {
3231 options->a_prefix = "a/";
3232 options->b_prefix = "b/";
3233 }
3234 }
3235
3236 void diff_setup_done(struct diff_options *options)
3237 {
3238 int count = 0;
3239
3240 if (options->set_default)
3241 options->set_default(options);
3242
3243 if (options->output_format & DIFF_FORMAT_NAME)
3244 count++;
3245 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3246 count++;
3247 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3248 count++;
3249 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3250 count++;
3251 if (count > 1)
3252 die("--name-only, --name-status, --check and -s are mutually exclusive");
3253
3254 /*
3255 * Most of the time we can say "there are changes"
3256 * only by checking if there are changed paths, but
3257 * --ignore-whitespace* options force us to look
3258 * inside contents.
3259 */
3260
3261 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3262 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3263 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3264 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3265 else
3266 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3267
3268 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3269 options->detect_rename = DIFF_DETECT_COPY;
3270
3271 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3272 options->prefix = NULL;
3273 if (options->prefix)
3274 options->prefix_length = strlen(options->prefix);
3275 else
3276 options->prefix_length = 0;
3277
3278 if (options->output_format & (DIFF_FORMAT_NAME |
3279 DIFF_FORMAT_NAME_STATUS |
3280 DIFF_FORMAT_CHECKDIFF |
3281 DIFF_FORMAT_NO_OUTPUT))
3282 options->output_format &= ~(DIFF_FORMAT_RAW |
3283 DIFF_FORMAT_NUMSTAT |
3284 DIFF_FORMAT_DIFFSTAT |
3285 DIFF_FORMAT_SHORTSTAT |
3286 DIFF_FORMAT_DIRSTAT |
3287 DIFF_FORMAT_SUMMARY |
3288 DIFF_FORMAT_PATCH);
3289
3290 /*
3291 * These cases always need recursive; we do not drop caller-supplied
3292 * recursive bits for other formats here.
3293 */
3294 if (options->output_format & (DIFF_FORMAT_PATCH |
3295 DIFF_FORMAT_NUMSTAT |
3296 DIFF_FORMAT_DIFFSTAT |
3297 DIFF_FORMAT_SHORTSTAT |
3298 DIFF_FORMAT_DIRSTAT |
3299 DIFF_FORMAT_SUMMARY |
3300 DIFF_FORMAT_CHECKDIFF))
3301 DIFF_OPT_SET(options, RECURSIVE);
3302 /*
3303 * Also pickaxe would not work very well if you do not say recursive
3304 */
3305 if (options->pickaxe)
3306 DIFF_OPT_SET(options, RECURSIVE);
3307 /*
3308 * When patches are generated, submodules diffed against the work tree
3309 * must be checked for dirtiness too so it can be shown in the output
3310 */
3311 if (options->output_format & DIFF_FORMAT_PATCH)
3312 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3313
3314 if (options->detect_rename && options->rename_limit < 0)
3315 options->rename_limit = diff_rename_limit_default;
3316 if (options->setup & DIFF_SETUP_USE_CACHE) {
3317 if (!active_cache)
3318 /* read-cache does not die even when it fails
3319 * so it is safe for us to do this here. Also
3320 * it does not smudge active_cache or active_nr
3321 * when it fails, so we do not have to worry about
3322 * cleaning it up ourselves either.
3323 */
3324 read_cache();
3325 }
3326 if (options->abbrev <= 0 || 40 < options->abbrev)
3327 options->abbrev = 40; /* full */
3328
3329 /*
3330 * It does not make sense to show the first hit we happened
3331 * to have found. It does not make sense not to return with
3332 * exit code in such a case either.
3333 */
3334 if (DIFF_OPT_TST(options, QUICK)) {
3335 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3336 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3337 }
3338
3339 options->diff_path_counter = 0;
3340 }
3341
3342 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3343 {
3344 char c, *eq;
3345 int len;
3346
3347 if (*arg != '-')
3348 return 0;
3349 c = *++arg;
3350 if (!c)
3351 return 0;
3352 if (c == arg_short) {
3353 c = *++arg;
3354 if (!c)
3355 return 1;
3356 if (val && isdigit(c)) {
3357 char *end;
3358 int n = strtoul(arg, &end, 10);
3359 if (*end)
3360 return 0;
3361 *val = n;
3362 return 1;
3363 }
3364 return 0;
3365 }
3366 if (c != '-')
3367 return 0;
3368 arg++;
3369 eq = strchr(arg, '=');
3370 if (eq)
3371 len = eq - arg;
3372 else
3373 len = strlen(arg);
3374 if (!len || strncmp(arg, arg_long, len))
3375 return 0;
3376 if (eq) {
3377 int n;
3378 char *end;
3379 if (!isdigit(*++eq))
3380 return 0;
3381 n = strtoul(eq, &end, 10);
3382 if (*end)
3383 return 0;
3384 *val = n;
3385 }
3386 return 1;
3387 }
3388
3389 static int diff_scoreopt_parse(const char *opt);
3390
3391 static inline int short_opt(char opt, const char **argv,
3392 const char **optarg)
3393 {
3394 const char *arg = argv[0];
3395 if (arg[0] != '-' || arg[1] != opt)
3396 return 0;
3397 if (arg[2] != '\0') {
3398 *optarg = arg + 2;
3399 return 1;
3400 }
3401 if (!argv[1])
3402 die("Option '%c' requires a value", opt);
3403 *optarg = argv[1];
3404 return 2;
3405 }
3406
3407 int parse_long_opt(const char *opt, const char **argv,
3408 const char **optarg)
3409 {
3410 const char *arg = argv[0];
3411 if (arg[0] != '-' || arg[1] != '-')
3412 return 0;
3413 arg += strlen("--");
3414 if (!starts_with(arg, opt))
3415 return 0;
3416 arg += strlen(opt);
3417 if (*arg == '=') { /* stuck form: --option=value */
3418 *optarg = arg + 1;
3419 return 1;
3420 }
3421 if (*arg != '\0')
3422 return 0;
3423 /* separate form: --option value */
3424 if (!argv[1])
3425 die("Option '--%s' requires a value", opt);
3426 *optarg = argv[1];
3427 return 2;
3428 }
3429
3430 static int stat_opt(struct diff_options *options, const char **av)
3431 {
3432 const char *arg = av[0];
3433 char *end;
3434 int width = options->stat_width;
3435 int name_width = options->stat_name_width;
3436 int graph_width = options->stat_graph_width;
3437 int count = options->stat_count;
3438 int argcount = 1;
3439
3440 arg += strlen("--stat");
3441 end = (char *)arg;
3442
3443 switch (*arg) {
3444 case '-':
3445 if (starts_with(arg, "-width")) {
3446 arg += strlen("-width");
3447 if (*arg == '=')
3448 width = strtoul(arg + 1, &end, 10);
3449 else if (!*arg && !av[1])
3450 die("Option '--stat-width' requires a value");
3451 else if (!*arg) {
3452 width = strtoul(av[1], &end, 10);
3453 argcount = 2;
3454 }
3455 } else if (starts_with(arg, "-name-width")) {
3456 arg += strlen("-name-width");
3457 if (*arg == '=')
3458 name_width = strtoul(arg + 1, &end, 10);
3459 else if (!*arg && !av[1])
3460 die("Option '--stat-name-width' requires a value");
3461 else if (!*arg) {
3462 name_width = strtoul(av[1], &end, 10);
3463 argcount = 2;
3464 }
3465 } else if (starts_with(arg, "-graph-width")) {
3466 arg += strlen("-graph-width");
3467 if (*arg == '=')
3468 graph_width = strtoul(arg + 1, &end, 10);
3469 else if (!*arg && !av[1])
3470 die("Option '--stat-graph-width' requires a value");
3471 else if (!*arg) {
3472 graph_width = strtoul(av[1], &end, 10);
3473 argcount = 2;
3474 }
3475 } else if (starts_with(arg, "-count")) {
3476 arg += strlen("-count");
3477 if (*arg == '=')
3478 count = strtoul(arg + 1, &end, 10);
3479 else if (!*arg && !av[1])
3480 die("Option '--stat-count' requires a value");
3481 else if (!*arg) {
3482 count = strtoul(av[1], &end, 10);
3483 argcount = 2;
3484 }
3485 }
3486 break;
3487 case '=':
3488 width = strtoul(arg+1, &end, 10);
3489 if (*end == ',')
3490 name_width = strtoul(end+1, &end, 10);
3491 if (*end == ',')
3492 count = strtoul(end+1, &end, 10);
3493 }
3494
3495 /* Important! This checks all the error cases! */
3496 if (*end)
3497 return 0;
3498 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3499 options->stat_name_width = name_width;
3500 options->stat_graph_width = graph_width;
3501 options->stat_width = width;
3502 options->stat_count = count;
3503 return argcount;
3504 }
3505
3506 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3507 {
3508 struct strbuf errmsg = STRBUF_INIT;
3509 if (parse_dirstat_params(options, params, &errmsg))
3510 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3511 errmsg.buf);
3512 strbuf_release(&errmsg);
3513 /*
3514 * The caller knows a dirstat-related option is given from the command
3515 * line; allow it to say "return this_function();"
3516 */
3517 options->output_format |= DIFF_FORMAT_DIRSTAT;
3518 return 1;
3519 }
3520
3521 static int parse_submodule_opt(struct diff_options *options, const char *value)
3522 {
3523 if (parse_submodule_params(options, value))
3524 die(_("Failed to parse --submodule option parameter: '%s'"),
3525 value);
3526 return 1;
3527 }
3528
3529 static const char diff_status_letters[] = {
3530 DIFF_STATUS_ADDED,
3531 DIFF_STATUS_COPIED,
3532 DIFF_STATUS_DELETED,
3533 DIFF_STATUS_MODIFIED,
3534 DIFF_STATUS_RENAMED,
3535 DIFF_STATUS_TYPE_CHANGED,
3536 DIFF_STATUS_UNKNOWN,
3537 DIFF_STATUS_UNMERGED,
3538 DIFF_STATUS_FILTER_AON,
3539 DIFF_STATUS_FILTER_BROKEN,
3540 '\0',
3541 };
3542
3543 static unsigned int filter_bit['Z' + 1];
3544
3545 static void prepare_filter_bits(void)
3546 {
3547 int i;
3548
3549 if (!filter_bit[DIFF_STATUS_ADDED]) {
3550 for (i = 0; diff_status_letters[i]; i++)
3551 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3552 }
3553 }
3554
3555 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3556 {
3557 return opt->filter & filter_bit[(int) status];
3558 }
3559
3560 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3561 {
3562 int i, optch;
3563
3564 prepare_filter_bits();
3565
3566 /*
3567 * If there is a negation e.g. 'd' in the input, and we haven't
3568 * initialized the filter field with another --diff-filter, start
3569 * from full set of bits, except for AON.
3570 */
3571 if (!opt->filter) {
3572 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3573 if (optch < 'a' || 'z' < optch)
3574 continue;
3575 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3576 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3577 break;
3578 }
3579 }
3580
3581 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3582 unsigned int bit;
3583 int negate;
3584
3585 if ('a' <= optch && optch <= 'z') {
3586 negate = 1;
3587 optch = toupper(optch);
3588 } else {
3589 negate = 0;
3590 }
3591
3592 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3593 if (!bit)
3594 return optarg[i];
3595 if (negate)
3596 opt->filter &= ~bit;
3597 else
3598 opt->filter |= bit;
3599 }
3600 return 0;
3601 }
3602
3603 /* Used only by "diff-files" and "diff --no-index" */
3604 void handle_deprecated_show_diff_q(struct diff_options *opt)
3605 {
3606 warning("'diff -q' and 'diff-files -q' are deprecated.");
3607 warning("Use 'diff --diff-filter=d' instead to ignore deleted filepairs.");
3608 parse_diff_filter_opt("d", opt);
3609 }
3610
3611 static void enable_patch_output(int *fmt) {
3612 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3613 *fmt |= DIFF_FORMAT_PATCH;
3614 }
3615
3616 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3617 {
3618 const char *arg = av[0];
3619 const char *optarg;
3620 int argcount;
3621
3622 /* Output format options */
3623 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3624 || opt_arg(arg, 'U', "unified", &options->context))
3625 enable_patch_output(&options->output_format);
3626 else if (!strcmp(arg, "--raw"))
3627 options->output_format |= DIFF_FORMAT_RAW;
3628 else if (!strcmp(arg, "--patch-with-raw")) {
3629 enable_patch_output(&options->output_format);
3630 options->output_format |= DIFF_FORMAT_RAW;
3631 } else if (!strcmp(arg, "--numstat"))
3632 options->output_format |= DIFF_FORMAT_NUMSTAT;
3633 else if (!strcmp(arg, "--shortstat"))
3634 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3635 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3636 return parse_dirstat_opt(options, "");
3637 else if (starts_with(arg, "-X"))
3638 return parse_dirstat_opt(options, arg + 2);
3639 else if (starts_with(arg, "--dirstat="))
3640 return parse_dirstat_opt(options, arg + 10);
3641 else if (!strcmp(arg, "--cumulative"))
3642 return parse_dirstat_opt(options, "cumulative");
3643 else if (!strcmp(arg, "--dirstat-by-file"))
3644 return parse_dirstat_opt(options, "files");
3645 else if (starts_with(arg, "--dirstat-by-file=")) {
3646 parse_dirstat_opt(options, "files");
3647 return parse_dirstat_opt(options, arg + 18);
3648 }
3649 else if (!strcmp(arg, "--check"))
3650 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3651 else if (!strcmp(arg, "--summary"))
3652 options->output_format |= DIFF_FORMAT_SUMMARY;
3653 else if (!strcmp(arg, "--patch-with-stat")) {
3654 enable_patch_output(&options->output_format);
3655 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3656 } else if (!strcmp(arg, "--name-only"))
3657 options->output_format |= DIFF_FORMAT_NAME;
3658 else if (!strcmp(arg, "--name-status"))
3659 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3660 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3661 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3662 else if (starts_with(arg, "--stat"))
3663 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3664 return stat_opt(options, av);
3665
3666 /* renames options */
3667 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3668 !strcmp(arg, "--break-rewrites")) {
3669 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3670 return error("invalid argument to -B: %s", arg+2);
3671 }
3672 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3673 !strcmp(arg, "--find-renames")) {
3674 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3675 return error("invalid argument to -M: %s", arg+2);
3676 options->detect_rename = DIFF_DETECT_RENAME;
3677 }
3678 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3679 options->irreversible_delete = 1;
3680 }
3681 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3682 !strcmp(arg, "--find-copies")) {
3683 if (options->detect_rename == DIFF_DETECT_COPY)
3684 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3685 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3686 return error("invalid argument to -C: %s", arg+2);
3687 options->detect_rename = DIFF_DETECT_COPY;
3688 }
3689 else if (!strcmp(arg, "--no-renames"))
3690 options->detect_rename = 0;
3691 else if (!strcmp(arg, "--rename-empty"))
3692 DIFF_OPT_SET(options, RENAME_EMPTY);
3693 else if (!strcmp(arg, "--no-rename-empty"))
3694 DIFF_OPT_CLR(options, RENAME_EMPTY);
3695 else if (!strcmp(arg, "--relative"))
3696 DIFF_OPT_SET(options, RELATIVE_NAME);
3697 else if (starts_with(arg, "--relative=")) {
3698 DIFF_OPT_SET(options, RELATIVE_NAME);
3699 options->prefix = arg + 11;
3700 }
3701
3702 /* xdiff options */
3703 else if (!strcmp(arg, "--minimal"))
3704 DIFF_XDL_SET(options, NEED_MINIMAL);
3705 else if (!strcmp(arg, "--no-minimal"))
3706 DIFF_XDL_CLR(options, NEED_MINIMAL);
3707 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3708 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3709 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3710 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3711 else if (!strcmp(arg, "--ignore-space-at-eol"))
3712 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3713 else if (!strcmp(arg, "--ignore-blank-lines"))
3714 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3715 else if (!strcmp(arg, "--patience"))
3716 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3717 else if (!strcmp(arg, "--histogram"))
3718 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3719 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3720 long value = parse_algorithm_value(optarg);
3721 if (value < 0)
3722 return error("option diff-algorithm accepts \"myers\", "
3723 "\"minimal\", \"patience\" and \"histogram\"");
3724 /* clear out previous settings */
3725 DIFF_XDL_CLR(options, NEED_MINIMAL);
3726 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3727 options->xdl_opts |= value;
3728 return argcount;
3729 }
3730
3731 /* flags options */
3732 else if (!strcmp(arg, "--binary")) {
3733 enable_patch_output(&options->output_format);
3734 DIFF_OPT_SET(options, BINARY);
3735 }
3736 else if (!strcmp(arg, "--full-index"))
3737 DIFF_OPT_SET(options, FULL_INDEX);
3738 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3739 DIFF_OPT_SET(options, TEXT);
3740 else if (!strcmp(arg, "-R"))
3741 DIFF_OPT_SET(options, REVERSE_DIFF);
3742 else if (!strcmp(arg, "--find-copies-harder"))
3743 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3744 else if (!strcmp(arg, "--follow"))
3745 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3746 else if (!strcmp(arg, "--no-follow"))
3747 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3748 else if (!strcmp(arg, "--color"))
3749 options->use_color = 1;
3750 else if (starts_with(arg, "--color=")) {
3751 int value = git_config_colorbool(NULL, arg+8);
3752 if (value < 0)
3753 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3754 options->use_color = value;
3755 }
3756 else if (!strcmp(arg, "--no-color"))
3757 options->use_color = 0;
3758 else if (!strcmp(arg, "--color-words")) {
3759 options->use_color = 1;
3760 options->word_diff = DIFF_WORDS_COLOR;
3761 }
3762 else if (starts_with(arg, "--color-words=")) {
3763 options->use_color = 1;
3764 options->word_diff = DIFF_WORDS_COLOR;
3765 options->word_regex = arg + 14;
3766 }
3767 else if (!strcmp(arg, "--word-diff")) {
3768 if (options->word_diff == DIFF_WORDS_NONE)
3769 options->word_diff = DIFF_WORDS_PLAIN;
3770 }
3771 else if (starts_with(arg, "--word-diff=")) {
3772 const char *type = arg + 12;
3773 if (!strcmp(type, "plain"))
3774 options->word_diff = DIFF_WORDS_PLAIN;
3775 else if (!strcmp(type, "color")) {
3776 options->use_color = 1;
3777 options->word_diff = DIFF_WORDS_COLOR;
3778 }
3779 else if (!strcmp(type, "porcelain"))
3780 options->word_diff = DIFF_WORDS_PORCELAIN;
3781 else if (!strcmp(type, "none"))
3782 options->word_diff = DIFF_WORDS_NONE;
3783 else
3784 die("bad --word-diff argument: %s", type);
3785 }
3786 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3787 if (options->word_diff == DIFF_WORDS_NONE)
3788 options->word_diff = DIFF_WORDS_PLAIN;
3789 options->word_regex = optarg;
3790 return argcount;
3791 }
3792 else if (!strcmp(arg, "--exit-code"))
3793 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3794 else if (!strcmp(arg, "--quiet"))
3795 DIFF_OPT_SET(options, QUICK);
3796 else if (!strcmp(arg, "--ext-diff"))
3797 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3798 else if (!strcmp(arg, "--no-ext-diff"))
3799 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3800 else if (!strcmp(arg, "--textconv"))
3801 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3802 else if (!strcmp(arg, "--no-textconv"))
3803 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3804 else if (!strcmp(arg, "--ignore-submodules")) {
3805 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3806 handle_ignore_submodules_arg(options, "all");
3807 } else if (starts_with(arg, "--ignore-submodules=")) {
3808 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3809 handle_ignore_submodules_arg(options, arg + 20);
3810 } else if (!strcmp(arg, "--submodule"))
3811 DIFF_OPT_SET(options, SUBMODULE_LOG);
3812 else if (starts_with(arg, "--submodule="))
3813 return parse_submodule_opt(options, arg + 12);
3814
3815 /* misc options */
3816 else if (!strcmp(arg, "-z"))
3817 options->line_termination = 0;
3818 else if ((argcount = short_opt('l', av, &optarg))) {
3819 options->rename_limit = strtoul(optarg, NULL, 10);
3820 return argcount;
3821 }
3822 else if ((argcount = short_opt('S', av, &optarg))) {
3823 options->pickaxe = optarg;
3824 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3825 return argcount;
3826 } else if ((argcount = short_opt('G', av, &optarg))) {
3827 options->pickaxe = optarg;
3828 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3829 return argcount;
3830 }
3831 else if (!strcmp(arg, "--pickaxe-all"))
3832 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3833 else if (!strcmp(arg, "--pickaxe-regex"))
3834 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3835 else if ((argcount = short_opt('O', av, &optarg))) {
3836 options->orderfile = optarg;
3837 return argcount;
3838 }
3839 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3840 int offending = parse_diff_filter_opt(optarg, options);
3841 if (offending)
3842 die("unknown change class '%c' in --diff-filter=%s",
3843 offending, optarg);
3844 return argcount;
3845 }
3846 else if (!strcmp(arg, "--abbrev"))
3847 options->abbrev = DEFAULT_ABBREV;
3848 else if (starts_with(arg, "--abbrev=")) {
3849 options->abbrev = strtoul(arg + 9, NULL, 10);
3850 if (options->abbrev < MINIMUM_ABBREV)
3851 options->abbrev = MINIMUM_ABBREV;
3852 else if (40 < options->abbrev)
3853 options->abbrev = 40;
3854 }
3855 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3856 options->a_prefix = optarg;
3857 return argcount;
3858 }
3859 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3860 options->b_prefix = optarg;
3861 return argcount;
3862 }
3863 else if (!strcmp(arg, "--no-prefix"))
3864 options->a_prefix = options->b_prefix = "";
3865 else if (opt_arg(arg, '\0', "inter-hunk-context",
3866 &options->interhunkcontext))
3867 ;
3868 else if (!strcmp(arg, "-W"))
3869 DIFF_OPT_SET(options, FUNCCONTEXT);
3870 else if (!strcmp(arg, "--function-context"))
3871 DIFF_OPT_SET(options, FUNCCONTEXT);
3872 else if (!strcmp(arg, "--no-function-context"))
3873 DIFF_OPT_CLR(options, FUNCCONTEXT);
3874 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3875 options->file = fopen(optarg, "w");
3876 if (!options->file)
3877 die_errno("Could not open '%s'", optarg);
3878 options->close_file = 1;
3879 return argcount;
3880 } else
3881 return 0;
3882 return 1;
3883 }
3884
3885 int parse_rename_score(const char **cp_p)
3886 {
3887 unsigned long num, scale;
3888 int ch, dot;
3889 const char *cp = *cp_p;
3890
3891 num = 0;
3892 scale = 1;
3893 dot = 0;
3894 for (;;) {
3895 ch = *cp;
3896 if ( !dot && ch == '.' ) {
3897 scale = 1;
3898 dot = 1;
3899 } else if ( ch == '%' ) {
3900 scale = dot ? scale*100 : 100;
3901 cp++; /* % is always at the end */
3902 break;
3903 } else if ( ch >= '0' && ch <= '9' ) {
3904 if ( scale < 100000 ) {
3905 scale *= 10;
3906 num = (num*10) + (ch-'0');
3907 }
3908 } else {
3909 break;
3910 }
3911 cp++;
3912 }
3913 *cp_p = cp;
3914
3915 /* user says num divided by scale and we say internally that
3916 * is MAX_SCORE * num / scale.
3917 */
3918 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3919 }
3920
3921 static int diff_scoreopt_parse(const char *opt)
3922 {
3923 int opt1, opt2, cmd;
3924
3925 if (*opt++ != '-')
3926 return -1;
3927 cmd = *opt++;
3928 if (cmd == '-') {
3929 /* convert the long-form arguments into short-form versions */
3930 if (starts_with(opt, "break-rewrites")) {
3931 opt += strlen("break-rewrites");
3932 if (*opt == 0 || *opt++ == '=')
3933 cmd = 'B';
3934 } else if (starts_with(opt, "find-copies")) {
3935 opt += strlen("find-copies");
3936 if (*opt == 0 || *opt++ == '=')
3937 cmd = 'C';
3938 } else if (starts_with(opt, "find-renames")) {
3939 opt += strlen("find-renames");
3940 if (*opt == 0 || *opt++ == '=')
3941 cmd = 'M';
3942 }
3943 }
3944 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3945 return -1; /* that is not a -M, -C, or -B option */
3946
3947 opt1 = parse_rename_score(&opt);
3948 if (cmd != 'B')
3949 opt2 = 0;
3950 else {
3951 if (*opt == 0)
3952 opt2 = 0;
3953 else if (*opt != '/')
3954 return -1; /* we expect -B80/99 or -B80 */
3955 else {
3956 opt++;
3957 opt2 = parse_rename_score(&opt);
3958 }
3959 }
3960 if (*opt != 0)
3961 return -1;
3962 return opt1 | (opt2 << 16);
3963 }
3964
3965 struct diff_queue_struct diff_queued_diff;
3966
3967 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3968 {
3969 if (queue->alloc <= queue->nr) {
3970 queue->alloc = alloc_nr(queue->alloc);
3971 queue->queue = xrealloc(queue->queue,
3972 sizeof(dp) * queue->alloc);
3973 }
3974 queue->queue[queue->nr++] = dp;
3975 }
3976
3977 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3978 struct diff_filespec *one,
3979 struct diff_filespec *two)
3980 {
3981 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3982 dp->one = one;
3983 dp->two = two;
3984 if (queue)
3985 diff_q(queue, dp);
3986 return dp;
3987 }
3988
3989 void diff_free_filepair(struct diff_filepair *p)
3990 {
3991 free_filespec(p->one);
3992 free_filespec(p->two);
3993 free(p);
3994 }
3995
3996 /* This is different from find_unique_abbrev() in that
3997 * it stuffs the result with dots for alignment.
3998 */
3999 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
4000 {
4001 int abblen;
4002 const char *abbrev;
4003 if (len == 40)
4004 return sha1_to_hex(sha1);
4005
4006 abbrev = find_unique_abbrev(sha1, len);
4007 abblen = strlen(abbrev);
4008 if (abblen < 37) {
4009 static char hex[41];
4010 if (len < abblen && abblen <= len + 2)
4011 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
4012 else
4013 sprintf(hex, "%s...", abbrev);
4014 return hex;
4015 }
4016 return sha1_to_hex(sha1);
4017 }
4018
4019 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4020 {
4021 int line_termination = opt->line_termination;
4022 int inter_name_termination = line_termination ? '\t' : '\0';
4023
4024 fprintf(opt->file, "%s", diff_line_prefix(opt));
4025 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4026 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4027 diff_unique_abbrev(p->one->sha1, opt->abbrev));
4028 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
4029 }
4030 if (p->score) {
4031 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4032 inter_name_termination);
4033 } else {
4034 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4035 }
4036
4037 if (p->status == DIFF_STATUS_COPIED ||
4038 p->status == DIFF_STATUS_RENAMED) {
4039 const char *name_a, *name_b;
4040 name_a = p->one->path;
4041 name_b = p->two->path;
4042 strip_prefix(opt->prefix_length, &name_a, &name_b);
4043 write_name_quoted(name_a, opt->file, inter_name_termination);
4044 write_name_quoted(name_b, opt->file, line_termination);
4045 } else {
4046 const char *name_a, *name_b;
4047 name_a = p->one->mode ? p->one->path : p->two->path;
4048 name_b = NULL;
4049 strip_prefix(opt->prefix_length, &name_a, &name_b);
4050 write_name_quoted(name_a, opt->file, line_termination);
4051 }
4052 }
4053
4054 int diff_unmodified_pair(struct diff_filepair *p)
4055 {
4056 /* This function is written stricter than necessary to support
4057 * the currently implemented transformers, but the idea is to
4058 * let transformers to produce diff_filepairs any way they want,
4059 * and filter and clean them up here before producing the output.
4060 */
4061 struct diff_filespec *one = p->one, *two = p->two;
4062
4063 if (DIFF_PAIR_UNMERGED(p))
4064 return 0; /* unmerged is interesting */
4065
4066 /* deletion, addition, mode or type change
4067 * and rename are all interesting.
4068 */
4069 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4070 DIFF_PAIR_MODE_CHANGED(p) ||
4071 strcmp(one->path, two->path))
4072 return 0;
4073
4074 /* both are valid and point at the same path. that is, we are
4075 * dealing with a change.
4076 */
4077 if (one->sha1_valid && two->sha1_valid &&
4078 !hashcmp(one->sha1, two->sha1) &&
4079 !one->dirty_submodule && !two->dirty_submodule)
4080 return 1; /* no change */
4081 if (!one->sha1_valid && !two->sha1_valid)
4082 return 1; /* both look at the same file on the filesystem. */
4083 return 0;
4084 }
4085
4086 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4087 {
4088 if (diff_unmodified_pair(p))
4089 return;
4090
4091 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4092 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4093 return; /* no tree diffs in patch format */
4094
4095 run_diff(p, o);
4096 }
4097
4098 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4099 struct diffstat_t *diffstat)
4100 {
4101 if (diff_unmodified_pair(p))
4102 return;
4103
4104 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4105 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4106 return; /* no useful stat for tree diffs */
4107
4108 run_diffstat(p, o, diffstat);
4109 }
4110
4111 static void diff_flush_checkdiff(struct diff_filepair *p,
4112 struct diff_options *o)
4113 {
4114 if (diff_unmodified_pair(p))
4115 return;
4116
4117 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4118 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4119 return; /* nothing to check in tree diffs */
4120
4121 run_checkdiff(p, o);
4122 }
4123
4124 int diff_queue_is_empty(void)
4125 {
4126 struct diff_queue_struct *q = &diff_queued_diff;
4127 int i;
4128 for (i = 0; i < q->nr; i++)
4129 if (!diff_unmodified_pair(q->queue[i]))
4130 return 0;
4131 return 1;
4132 }
4133
4134 #if DIFF_DEBUG
4135 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4136 {
4137 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4138 x, one ? one : "",
4139 s->path,
4140 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4141 s->mode,
4142 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4143 fprintf(stderr, "queue[%d] %s size %lu\n",
4144 x, one ? one : "",
4145 s->size);
4146 }
4147
4148 void diff_debug_filepair(const struct diff_filepair *p, int i)
4149 {
4150 diff_debug_filespec(p->one, i, "one");
4151 diff_debug_filespec(p->two, i, "two");
4152 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4153 p->score, p->status ? p->status : '?',
4154 p->one->rename_used, p->broken_pair);
4155 }
4156
4157 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4158 {
4159 int i;
4160 if (msg)
4161 fprintf(stderr, "%s\n", msg);
4162 fprintf(stderr, "q->nr = %d\n", q->nr);
4163 for (i = 0; i < q->nr; i++) {
4164 struct diff_filepair *p = q->queue[i];
4165 diff_debug_filepair(p, i);
4166 }
4167 }
4168 #endif
4169
4170 static void diff_resolve_rename_copy(void)
4171 {
4172 int i;
4173 struct diff_filepair *p;
4174 struct diff_queue_struct *q = &diff_queued_diff;
4175
4176 diff_debug_queue("resolve-rename-copy", q);
4177
4178 for (i = 0; i < q->nr; i++) {
4179 p = q->queue[i];
4180 p->status = 0; /* undecided */
4181 if (DIFF_PAIR_UNMERGED(p))
4182 p->status = DIFF_STATUS_UNMERGED;
4183 else if (!DIFF_FILE_VALID(p->one))
4184 p->status = DIFF_STATUS_ADDED;
4185 else if (!DIFF_FILE_VALID(p->two))
4186 p->status = DIFF_STATUS_DELETED;
4187 else if (DIFF_PAIR_TYPE_CHANGED(p))
4188 p->status = DIFF_STATUS_TYPE_CHANGED;
4189
4190 /* from this point on, we are dealing with a pair
4191 * whose both sides are valid and of the same type, i.e.
4192 * either in-place edit or rename/copy edit.
4193 */
4194 else if (DIFF_PAIR_RENAME(p)) {
4195 /*
4196 * A rename might have re-connected a broken
4197 * pair up, causing the pathnames to be the
4198 * same again. If so, that's not a rename at
4199 * all, just a modification..
4200 *
4201 * Otherwise, see if this source was used for
4202 * multiple renames, in which case we decrement
4203 * the count, and call it a copy.
4204 */
4205 if (!strcmp(p->one->path, p->two->path))
4206 p->status = DIFF_STATUS_MODIFIED;
4207 else if (--p->one->rename_used > 0)
4208 p->status = DIFF_STATUS_COPIED;
4209 else
4210 p->status = DIFF_STATUS_RENAMED;
4211 }
4212 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4213 p->one->mode != p->two->mode ||
4214 p->one->dirty_submodule ||
4215 p->two->dirty_submodule ||
4216 is_null_sha1(p->one->sha1))
4217 p->status = DIFF_STATUS_MODIFIED;
4218 else {
4219 /* This is a "no-change" entry and should not
4220 * happen anymore, but prepare for broken callers.
4221 */
4222 error("feeding unmodified %s to diffcore",
4223 p->one->path);
4224 p->status = DIFF_STATUS_UNKNOWN;
4225 }
4226 }
4227 diff_debug_queue("resolve-rename-copy done", q);
4228 }
4229
4230 static int check_pair_status(struct diff_filepair *p)
4231 {
4232 switch (p->status) {
4233 case DIFF_STATUS_UNKNOWN:
4234 return 0;
4235 case 0:
4236 die("internal error in diff-resolve-rename-copy");
4237 default:
4238 return 1;
4239 }
4240 }
4241
4242 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4243 {
4244 int fmt = opt->output_format;
4245
4246 if (fmt & DIFF_FORMAT_CHECKDIFF)
4247 diff_flush_checkdiff(p, opt);
4248 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4249 diff_flush_raw(p, opt);
4250 else if (fmt & DIFF_FORMAT_NAME) {
4251 const char *name_a, *name_b;
4252 name_a = p->two->path;
4253 name_b = NULL;
4254 strip_prefix(opt->prefix_length, &name_a, &name_b);
4255 write_name_quoted(name_a, opt->file, opt->line_termination);
4256 }
4257 }
4258
4259 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4260 {
4261 if (fs->mode)
4262 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4263 else
4264 fprintf(file, " %s ", newdelete);
4265 write_name_quoted(fs->path, file, '\n');
4266 }
4267
4268
4269 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4270 const char *line_prefix)
4271 {
4272 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4273 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4274 p->two->mode, show_name ? ' ' : '\n');
4275 if (show_name) {
4276 write_name_quoted(p->two->path, file, '\n');
4277 }
4278 }
4279 }
4280
4281 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4282 const char *line_prefix)
4283 {
4284 char *names = pprint_rename(p->one->path, p->two->path);
4285
4286 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4287 free(names);
4288 show_mode_change(file, p, 0, line_prefix);
4289 }
4290
4291 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4292 {
4293 FILE *file = opt->file;
4294 const char *line_prefix = diff_line_prefix(opt);
4295
4296 switch(p->status) {
4297 case DIFF_STATUS_DELETED:
4298 fputs(line_prefix, file);
4299 show_file_mode_name(file, "delete", p->one);
4300 break;
4301 case DIFF_STATUS_ADDED:
4302 fputs(line_prefix, file);
4303 show_file_mode_name(file, "create", p->two);
4304 break;
4305 case DIFF_STATUS_COPIED:
4306 fputs(line_prefix, file);
4307 show_rename_copy(file, "copy", p, line_prefix);
4308 break;
4309 case DIFF_STATUS_RENAMED:
4310 fputs(line_prefix, file);
4311 show_rename_copy(file, "rename", p, line_prefix);
4312 break;
4313 default:
4314 if (p->score) {
4315 fprintf(file, "%s rewrite ", line_prefix);
4316 write_name_quoted(p->two->path, file, ' ');
4317 fprintf(file, "(%d%%)\n", similarity_index(p));
4318 }
4319 show_mode_change(file, p, !p->score, line_prefix);
4320 break;
4321 }
4322 }
4323
4324 struct patch_id_t {
4325 git_SHA_CTX *ctx;
4326 int patchlen;
4327 };
4328
4329 static int remove_space(char *line, int len)
4330 {
4331 int i;
4332 char *dst = line;
4333 unsigned char c;
4334
4335 for (i = 0; i < len; i++)
4336 if (!isspace((c = line[i])))
4337 *dst++ = c;
4338
4339 return dst - line;
4340 }
4341
4342 static void patch_id_consume(void *priv, char *line, unsigned long len)
4343 {
4344 struct patch_id_t *data = priv;
4345 int new_len;
4346
4347 /* Ignore line numbers when computing the SHA1 of the patch */
4348 if (starts_with(line, "@@ -"))
4349 return;
4350
4351 new_len = remove_space(line, len);
4352
4353 git_SHA1_Update(data->ctx, line, new_len);
4354 data->patchlen += new_len;
4355 }
4356
4357 /* returns 0 upon success, and writes result into sha1 */
4358 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4359 {
4360 struct diff_queue_struct *q = &diff_queued_diff;
4361 int i;
4362 git_SHA_CTX ctx;
4363 struct patch_id_t data;
4364 char buffer[PATH_MAX * 4 + 20];
4365
4366 git_SHA1_Init(&ctx);
4367 memset(&data, 0, sizeof(struct patch_id_t));
4368 data.ctx = &ctx;
4369
4370 for (i = 0; i < q->nr; i++) {
4371 xpparam_t xpp;
4372 xdemitconf_t xecfg;
4373 mmfile_t mf1, mf2;
4374 struct diff_filepair *p = q->queue[i];
4375 int len1, len2;
4376
4377 memset(&xpp, 0, sizeof(xpp));
4378 memset(&xecfg, 0, sizeof(xecfg));
4379 if (p->status == 0)
4380 return error("internal diff status error");
4381 if (p->status == DIFF_STATUS_UNKNOWN)
4382 continue;
4383 if (diff_unmodified_pair(p))
4384 continue;
4385 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4386 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4387 continue;
4388 if (DIFF_PAIR_UNMERGED(p))
4389 continue;
4390
4391 diff_fill_sha1_info(p->one);
4392 diff_fill_sha1_info(p->two);
4393 if (fill_mmfile(&mf1, p->one) < 0 ||
4394 fill_mmfile(&mf2, p->two) < 0)
4395 return error("unable to read files to diff");
4396
4397 len1 = remove_space(p->one->path, strlen(p->one->path));
4398 len2 = remove_space(p->two->path, strlen(p->two->path));
4399 if (p->one->mode == 0)
4400 len1 = snprintf(buffer, sizeof(buffer),
4401 "diff--gita/%.*sb/%.*s"
4402 "newfilemode%06o"
4403 "---/dev/null"
4404 "+++b/%.*s",
4405 len1, p->one->path,
4406 len2, p->two->path,
4407 p->two->mode,
4408 len2, p->two->path);
4409 else if (p->two->mode == 0)
4410 len1 = snprintf(buffer, sizeof(buffer),
4411 "diff--gita/%.*sb/%.*s"
4412 "deletedfilemode%06o"
4413 "---a/%.*s"
4414 "+++/dev/null",
4415 len1, p->one->path,
4416 len2, p->two->path,
4417 p->one->mode,
4418 len1, p->one->path);
4419 else
4420 len1 = snprintf(buffer, sizeof(buffer),
4421 "diff--gita/%.*sb/%.*s"
4422 "---a/%.*s"
4423 "+++b/%.*s",
4424 len1, p->one->path,
4425 len2, p->two->path,
4426 len1, p->one->path,
4427 len2, p->two->path);
4428 git_SHA1_Update(&ctx, buffer, len1);
4429
4430 if (diff_filespec_is_binary(p->one) ||
4431 diff_filespec_is_binary(p->two)) {
4432 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4433 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4434 continue;
4435 }
4436
4437 xpp.flags = 0;
4438 xecfg.ctxlen = 3;
4439 xecfg.flags = 0;
4440 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4441 &xpp, &xecfg);
4442 }
4443
4444 git_SHA1_Final(sha1, &ctx);
4445 return 0;
4446 }
4447
4448 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4449 {
4450 struct diff_queue_struct *q = &diff_queued_diff;
4451 int i;
4452 int result = diff_get_patch_id(options, sha1);
4453
4454 for (i = 0; i < q->nr; i++)
4455 diff_free_filepair(q->queue[i]);
4456
4457 free(q->queue);
4458 DIFF_QUEUE_CLEAR(q);
4459
4460 return result;
4461 }
4462
4463 static int is_summary_empty(const struct diff_queue_struct *q)
4464 {
4465 int i;
4466
4467 for (i = 0; i < q->nr; i++) {
4468 const struct diff_filepair *p = q->queue[i];
4469
4470 switch (p->status) {
4471 case DIFF_STATUS_DELETED:
4472 case DIFF_STATUS_ADDED:
4473 case DIFF_STATUS_COPIED:
4474 case DIFF_STATUS_RENAMED:
4475 return 0;
4476 default:
4477 if (p->score)
4478 return 0;
4479 if (p->one->mode && p->two->mode &&
4480 p->one->mode != p->two->mode)
4481 return 0;
4482 break;
4483 }
4484 }
4485 return 1;
4486 }
4487
4488 static const char rename_limit_warning[] =
4489 "inexact rename detection was skipped due to too many files.";
4490
4491 static const char degrade_cc_to_c_warning[] =
4492 "only found copies from modified paths due to too many files.";
4493
4494 static const char rename_limit_advice[] =
4495 "you may want to set your %s variable to at least "
4496 "%d and retry the command.";
4497
4498 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4499 {
4500 if (degraded_cc)
4501 warning(degrade_cc_to_c_warning);
4502 else if (needed)
4503 warning(rename_limit_warning);
4504 else
4505 return;
4506 if (0 < needed && needed < 32767)
4507 warning(rename_limit_advice, varname, needed);
4508 }
4509
4510 void diff_flush(struct diff_options *options)
4511 {
4512 struct diff_queue_struct *q = &diff_queued_diff;
4513 int i, output_format = options->output_format;
4514 int separator = 0;
4515 int dirstat_by_line = 0;
4516
4517 /*
4518 * Order: raw, stat, summary, patch
4519 * or: name/name-status/checkdiff (other bits clear)
4520 */
4521 if (!q->nr)
4522 goto free_queue;
4523
4524 if (output_format & (DIFF_FORMAT_RAW |
4525 DIFF_FORMAT_NAME |
4526 DIFF_FORMAT_NAME_STATUS |
4527 DIFF_FORMAT_CHECKDIFF)) {
4528 for (i = 0; i < q->nr; i++) {
4529 struct diff_filepair *p = q->queue[i];
4530 if (check_pair_status(p))
4531 flush_one_pair(p, options);
4532 }
4533 separator++;
4534 }
4535
4536 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4537 dirstat_by_line = 1;
4538
4539 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4540 dirstat_by_line) {
4541 struct diffstat_t diffstat;
4542
4543 memset(&diffstat, 0, sizeof(struct diffstat_t));
4544 for (i = 0; i < q->nr; i++) {
4545 struct diff_filepair *p = q->queue[i];
4546 if (check_pair_status(p))
4547 diff_flush_stat(p, options, &diffstat);
4548 }
4549 if (output_format & DIFF_FORMAT_NUMSTAT)
4550 show_numstat(&diffstat, options);
4551 if (output_format & DIFF_FORMAT_DIFFSTAT)
4552 show_stats(&diffstat, options);
4553 if (output_format & DIFF_FORMAT_SHORTSTAT)
4554 show_shortstats(&diffstat, options);
4555 if (output_format & DIFF_FORMAT_DIRSTAT)
4556 show_dirstat_by_line(&diffstat, options);
4557 free_diffstat_info(&diffstat);
4558 separator++;
4559 }
4560 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4561 show_dirstat(options);
4562
4563 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4564 for (i = 0; i < q->nr; i++) {
4565 diff_summary(options, q->queue[i]);
4566 }
4567 separator++;
4568 }
4569
4570 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4571 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4572 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4573 /*
4574 * run diff_flush_patch for the exit status. setting
4575 * options->file to /dev/null should be safe, because we
4576 * aren't supposed to produce any output anyway.
4577 */
4578 if (options->close_file)
4579 fclose(options->file);
4580 options->file = fopen("/dev/null", "w");
4581 if (!options->file)
4582 die_errno("Could not open /dev/null");
4583 options->close_file = 1;
4584 for (i = 0; i < q->nr; i++) {
4585 struct diff_filepair *p = q->queue[i];
4586 if (check_pair_status(p))
4587 diff_flush_patch(p, options);
4588 if (options->found_changes)
4589 break;
4590 }
4591 }
4592
4593 if (output_format & DIFF_FORMAT_PATCH) {
4594 if (separator) {
4595 fprintf(options->file, "%s%c",
4596 diff_line_prefix(options),
4597 options->line_termination);
4598 if (options->stat_sep) {
4599 /* attach patch instead of inline */
4600 fputs(options->stat_sep, options->file);
4601 }
4602 }
4603
4604 for (i = 0; i < q->nr; i++) {
4605 struct diff_filepair *p = q->queue[i];
4606 if (check_pair_status(p))
4607 diff_flush_patch(p, options);
4608 }
4609 }
4610
4611 if (output_format & DIFF_FORMAT_CALLBACK)
4612 options->format_callback(q, options, options->format_callback_data);
4613
4614 for (i = 0; i < q->nr; i++)
4615 diff_free_filepair(q->queue[i]);
4616 free_queue:
4617 free(q->queue);
4618 DIFF_QUEUE_CLEAR(q);
4619 if (options->close_file)
4620 fclose(options->file);
4621
4622 /*
4623 * Report the content-level differences with HAS_CHANGES;
4624 * diff_addremove/diff_change does not set the bit when
4625 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4626 */
4627 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4628 if (options->found_changes)
4629 DIFF_OPT_SET(options, HAS_CHANGES);
4630 else
4631 DIFF_OPT_CLR(options, HAS_CHANGES);
4632 }
4633 }
4634
4635 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4636 {
4637 return (((p->status == DIFF_STATUS_MODIFIED) &&
4638 ((p->score &&
4639 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4640 (!p->score &&
4641 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4642 ((p->status != DIFF_STATUS_MODIFIED) &&
4643 filter_bit_tst(p->status, options)));
4644 }
4645
4646 static void diffcore_apply_filter(struct diff_options *options)
4647 {
4648 int i;
4649 struct diff_queue_struct *q = &diff_queued_diff;
4650 struct diff_queue_struct outq;
4651
4652 DIFF_QUEUE_CLEAR(&outq);
4653
4654 if (!options->filter)
4655 return;
4656
4657 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4658 int found;
4659 for (i = found = 0; !found && i < q->nr; i++) {
4660 if (match_filter(options, q->queue[i]))
4661 found++;
4662 }
4663 if (found)
4664 return;
4665
4666 /* otherwise we will clear the whole queue
4667 * by copying the empty outq at the end of this
4668 * function, but first clear the current entries
4669 * in the queue.
4670 */
4671 for (i = 0; i < q->nr; i++)
4672 diff_free_filepair(q->queue[i]);
4673 }
4674 else {
4675 /* Only the matching ones */
4676 for (i = 0; i < q->nr; i++) {
4677 struct diff_filepair *p = q->queue[i];
4678 if (match_filter(options, p))
4679 diff_q(&outq, p);
4680 else
4681 diff_free_filepair(p);
4682 }
4683 }
4684 free(q->queue);
4685 *q = outq;
4686 }
4687
4688 /* Check whether two filespecs with the same mode and size are identical */
4689 static int diff_filespec_is_identical(struct diff_filespec *one,
4690 struct diff_filespec *two)
4691 {
4692 if (S_ISGITLINK(one->mode))
4693 return 0;
4694 if (diff_populate_filespec(one, 0))
4695 return 0;
4696 if (diff_populate_filespec(two, 0))
4697 return 0;
4698 return !memcmp(one->data, two->data, one->size);
4699 }
4700
4701 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4702 {
4703 if (p->done_skip_stat_unmatch)
4704 return p->skip_stat_unmatch_result;
4705
4706 p->done_skip_stat_unmatch = 1;
4707 p->skip_stat_unmatch_result = 0;
4708 /*
4709 * 1. Entries that come from stat info dirtiness
4710 * always have both sides (iow, not create/delete),
4711 * one side of the object name is unknown, with
4712 * the same mode and size. Keep the ones that
4713 * do not match these criteria. They have real
4714 * differences.
4715 *
4716 * 2. At this point, the file is known to be modified,
4717 * with the same mode and size, and the object
4718 * name of one side is unknown. Need to inspect
4719 * the identical contents.
4720 */
4721 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4722 !DIFF_FILE_VALID(p->two) ||
4723 (p->one->sha1_valid && p->two->sha1_valid) ||
4724 (p->one->mode != p->two->mode) ||
4725 diff_populate_filespec(p->one, 1) ||
4726 diff_populate_filespec(p->two, 1) ||
4727 (p->one->size != p->two->size) ||
4728 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4729 p->skip_stat_unmatch_result = 1;
4730 return p->skip_stat_unmatch_result;
4731 }
4732
4733 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4734 {
4735 int i;
4736 struct diff_queue_struct *q = &diff_queued_diff;
4737 struct diff_queue_struct outq;
4738 DIFF_QUEUE_CLEAR(&outq);
4739
4740 for (i = 0; i < q->nr; i++) {
4741 struct diff_filepair *p = q->queue[i];
4742
4743 if (diff_filespec_check_stat_unmatch(p))
4744 diff_q(&outq, p);
4745 else {
4746 /*
4747 * The caller can subtract 1 from skip_stat_unmatch
4748 * to determine how many paths were dirty only
4749 * due to stat info mismatch.
4750 */
4751 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4752 diffopt->skip_stat_unmatch++;
4753 diff_free_filepair(p);
4754 }
4755 }
4756 free(q->queue);
4757 *q = outq;
4758 }
4759
4760 static int diffnamecmp(const void *a_, const void *b_)
4761 {
4762 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4763 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4764 const char *name_a, *name_b;
4765
4766 name_a = a->one ? a->one->path : a->two->path;
4767 name_b = b->one ? b->one->path : b->two->path;
4768 return strcmp(name_a, name_b);
4769 }
4770
4771 void diffcore_fix_diff_index(struct diff_options *options)
4772 {
4773 struct diff_queue_struct *q = &diff_queued_diff;
4774 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4775 }
4776
4777 void diffcore_std(struct diff_options *options)
4778 {
4779 if (options->skip_stat_unmatch)
4780 diffcore_skip_stat_unmatch(options);
4781 if (!options->found_follow) {
4782 /* See try_to_follow_renames() in tree-diff.c */
4783 if (options->break_opt != -1)
4784 diffcore_break(options->break_opt);
4785 if (options->detect_rename)
4786 diffcore_rename(options);
4787 if (options->break_opt != -1)
4788 diffcore_merge_broken();
4789 }
4790 if (options->pickaxe)
4791 diffcore_pickaxe(options);
4792 if (options->orderfile)
4793 diffcore_order(options->orderfile);
4794 if (!options->found_follow)
4795 /* See try_to_follow_renames() in tree-diff.c */
4796 diff_resolve_rename_copy();
4797 diffcore_apply_filter(options);
4798
4799 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4800 DIFF_OPT_SET(options, HAS_CHANGES);
4801 else
4802 DIFF_OPT_CLR(options, HAS_CHANGES);
4803
4804 options->found_follow = 0;
4805 }
4806
4807 int diff_result_code(struct diff_options *opt, int status)
4808 {
4809 int result = 0;
4810
4811 diff_warn_rename_limit("diff.renameLimit",
4812 opt->needed_rename_limit,
4813 opt->degraded_cc_to_c);
4814 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4815 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4816 return status;
4817 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4818 DIFF_OPT_TST(opt, HAS_CHANGES))
4819 result |= 01;
4820 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4821 DIFF_OPT_TST(opt, CHECK_FAILED))
4822 result |= 02;
4823 return result;
4824 }
4825
4826 int diff_can_quit_early(struct diff_options *opt)
4827 {
4828 return (DIFF_OPT_TST(opt, QUICK) &&
4829 !opt->filter &&
4830 DIFF_OPT_TST(opt, HAS_CHANGES));
4831 }
4832
4833 /*
4834 * Shall changes to this submodule be ignored?
4835 *
4836 * Submodule changes can be configured to be ignored separately for each path,
4837 * but that configuration can be overridden from the command line.
4838 */
4839 static int is_submodule_ignored(const char *path, struct diff_options *options)
4840 {
4841 int ignored = 0;
4842 unsigned orig_flags = options->flags;
4843 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4844 set_diffopt_flags_from_submodule_config(options, path);
4845 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4846 ignored = 1;
4847 options->flags = orig_flags;
4848 return ignored;
4849 }
4850
4851 void diff_addremove(struct diff_options *options,
4852 int addremove, unsigned mode,
4853 const unsigned char *sha1,
4854 int sha1_valid,
4855 const char *concatpath, unsigned dirty_submodule)
4856 {
4857 struct diff_filespec *one, *two;
4858
4859 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4860 return;
4861
4862 /* This may look odd, but it is a preparation for
4863 * feeding "there are unchanged files which should
4864 * not produce diffs, but when you are doing copy
4865 * detection you would need them, so here they are"
4866 * entries to the diff-core. They will be prefixed
4867 * with something like '=' or '*' (I haven't decided
4868 * which but should not make any difference).
4869 * Feeding the same new and old to diff_change()
4870 * also has the same effect.
4871 * Before the final output happens, they are pruned after
4872 * merged into rename/copy pairs as appropriate.
4873 */
4874 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4875 addremove = (addremove == '+' ? '-' :
4876 addremove == '-' ? '+' : addremove);
4877
4878 if (options->prefix &&
4879 strncmp(concatpath, options->prefix, options->prefix_length))
4880 return;
4881
4882 one = alloc_filespec(concatpath);
4883 two = alloc_filespec(concatpath);
4884
4885 if (addremove != '+')
4886 fill_filespec(one, sha1, sha1_valid, mode);
4887 if (addremove != '-') {
4888 fill_filespec(two, sha1, sha1_valid, mode);
4889 two->dirty_submodule = dirty_submodule;
4890 }
4891
4892 diff_queue(&diff_queued_diff, one, two);
4893 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4894 DIFF_OPT_SET(options, HAS_CHANGES);
4895 }
4896
4897 void diff_change(struct diff_options *options,
4898 unsigned old_mode, unsigned new_mode,
4899 const unsigned char *old_sha1,
4900 const unsigned char *new_sha1,
4901 int old_sha1_valid, int new_sha1_valid,
4902 const char *concatpath,
4903 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4904 {
4905 struct diff_filespec *one, *two;
4906 struct diff_filepair *p;
4907
4908 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4909 is_submodule_ignored(concatpath, options))
4910 return;
4911
4912 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4913 unsigned tmp;
4914 const unsigned char *tmp_c;
4915 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4916 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4917 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4918 new_sha1_valid = tmp;
4919 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4920 new_dirty_submodule = tmp;
4921 }
4922
4923 if (options->prefix &&
4924 strncmp(concatpath, options->prefix, options->prefix_length))
4925 return;
4926
4927 one = alloc_filespec(concatpath);
4928 two = alloc_filespec(concatpath);
4929 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4930 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4931 one->dirty_submodule = old_dirty_submodule;
4932 two->dirty_submodule = new_dirty_submodule;
4933 p = diff_queue(&diff_queued_diff, one, two);
4934
4935 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4936 return;
4937
4938 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
4939 !diff_filespec_check_stat_unmatch(p))
4940 return;
4941
4942 DIFF_OPT_SET(options, HAS_CHANGES);
4943 }
4944
4945 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4946 {
4947 struct diff_filepair *pair;
4948 struct diff_filespec *one, *two;
4949
4950 if (options->prefix &&
4951 strncmp(path, options->prefix, options->prefix_length))
4952 return NULL;
4953
4954 one = alloc_filespec(path);
4955 two = alloc_filespec(path);
4956 pair = diff_queue(&diff_queued_diff, one, two);
4957 pair->is_unmerged = 1;
4958 return pair;
4959 }
4960
4961 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4962 size_t *outsize)
4963 {
4964 struct diff_tempfile *temp;
4965 const char *argv[3];
4966 const char **arg = argv;
4967 struct child_process child;
4968 struct strbuf buf = STRBUF_INIT;
4969 int err = 0;
4970
4971 temp = prepare_temp_file(spec->path, spec);
4972 *arg++ = pgm;
4973 *arg++ = temp->name;
4974 *arg = NULL;
4975
4976 memset(&child, 0, sizeof(child));
4977 child.use_shell = 1;
4978 child.argv = argv;
4979 child.out = -1;
4980 if (start_command(&child)) {
4981 remove_tempfile();
4982 return NULL;
4983 }
4984
4985 if (strbuf_read(&buf, child.out, 0) < 0)
4986 err = error("error reading from textconv command '%s'", pgm);
4987 close(child.out);
4988
4989 if (finish_command(&child) || err) {
4990 strbuf_release(&buf);
4991 remove_tempfile();
4992 return NULL;
4993 }
4994 remove_tempfile();
4995
4996 return strbuf_detach(&buf, outsize);
4997 }
4998
4999 size_t fill_textconv(struct userdiff_driver *driver,
5000 struct diff_filespec *df,
5001 char **outbuf)
5002 {
5003 size_t size;
5004
5005 if (!driver || !driver->textconv) {
5006 if (!DIFF_FILE_VALID(df)) {
5007 *outbuf = "";
5008 return 0;
5009 }
5010 if (diff_populate_filespec(df, 0))
5011 die("unable to read files to diff");
5012 *outbuf = df->data;
5013 return df->size;
5014 }
5015
5016 if (driver->textconv_cache && df->sha1_valid) {
5017 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
5018 &size);
5019 if (*outbuf)
5020 return size;
5021 }
5022
5023 *outbuf = run_textconv(driver->textconv, df, &size);
5024 if (!*outbuf)
5025 die("unable to read files to diff");
5026
5027 if (driver->textconv_cache && df->sha1_valid) {
5028 /* ignore errors, as we might be in a readonly repository */
5029 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
5030 size);
5031 /*
5032 * we could save up changes and flush them all at the end,
5033 * but we would need an extra call after all diffing is done.
5034 * Since generating a cache entry is the slow path anyway,
5035 * this extra overhead probably isn't a big deal.
5036 */
5037 notes_cache_write(driver->textconv_cache);
5038 }
5039
5040 return size;
5041 }
5042
5043 void setup_diff_pager(struct diff_options *opt)
5044 {
5045 /*
5046 * If the user asked for our exit code, then either they want --quiet
5047 * or --exit-code. We should definitely not bother with a pager in the
5048 * former case, as we will generate no output. Since we still properly
5049 * report our exit code even when a pager is run, we _could_ run a
5050 * pager with --exit-code. But since we have not done so historically,
5051 * and because it is easy to find people oneline advising "git diff
5052 * --exit-code" in hooks and other scripts, we do not do so.
5053 */
5054 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5055 check_pager_config("diff") != 0)
5056 setup_pager();
5057 }
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