?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
builtin/mktree.c: use ALLOC_GROW() in append_to_tree()
[git/mingw.git] / diff.c
blobf5f0fd1e7f399a244743acf18a4bc2c870900ce2
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18 #include "string-list.h"
19
20 #ifdef NO_FAST_WORKING_DIRECTORY
21 #define FAST_WORKING_DIRECTORY 0
22 #else
23 #define FAST_WORKING_DIRECTORY 1
24 #endif
25
26 static int diff_detect_rename_default;
27 static int diff_rename_limit_default = 400;
28 static int diff_suppress_blank_empty;
29 static int diff_use_color_default = -1;
30 static int diff_context_default = 3;
31 static const char *diff_word_regex_cfg;
32 static const char *external_diff_cmd_cfg;
33 static const char *diff_order_file_cfg;
34 int diff_auto_refresh_index = 1;
35 static int diff_mnemonic_prefix;
36 static int diff_no_prefix;
37 static int diff_stat_graph_width;
38 static int diff_dirstat_permille_default = 30;
39 static struct diff_options default_diff_options;
40 static long diff_algorithm;
41
42 static char diff_colors[][COLOR_MAXLEN] = {
43 GIT_COLOR_RESET,
44 GIT_COLOR_NORMAL, /* PLAIN */
45 GIT_COLOR_BOLD, /* METAINFO */
46 GIT_COLOR_CYAN, /* FRAGINFO */
47 GIT_COLOR_RED, /* OLD */
48 GIT_COLOR_GREEN, /* NEW */
49 GIT_COLOR_YELLOW, /* COMMIT */
50 GIT_COLOR_BG_RED, /* WHITESPACE */
51 GIT_COLOR_NORMAL, /* FUNCINFO */
52 };
53
54 static int parse_diff_color_slot(const char *var, int ofs)
55 {
56 if (!strcasecmp(var+ofs, "plain"))
57 return DIFF_PLAIN;
58 if (!strcasecmp(var+ofs, "meta"))
59 return DIFF_METAINFO;
60 if (!strcasecmp(var+ofs, "frag"))
61 return DIFF_FRAGINFO;
62 if (!strcasecmp(var+ofs, "old"))
63 return DIFF_FILE_OLD;
64 if (!strcasecmp(var+ofs, "new"))
65 return DIFF_FILE_NEW;
66 if (!strcasecmp(var+ofs, "commit"))
67 return DIFF_COMMIT;
68 if (!strcasecmp(var+ofs, "whitespace"))
69 return DIFF_WHITESPACE;
70 if (!strcasecmp(var+ofs, "func"))
71 return DIFF_FUNCINFO;
72 return -1;
73 }
74
75 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
76 struct strbuf *errmsg)
77 {
78 char *params_copy = xstrdup(params_string);
79 struct string_list params = STRING_LIST_INIT_NODUP;
80 int ret = 0;
81 int i;
82
83 if (*params_copy)
84 string_list_split_in_place(&params, params_copy, ',', -1);
85 for (i = 0; i < params.nr; i++) {
86 const char *p = params.items[i].string;
87 if (!strcmp(p, "changes")) {
88 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
89 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
90 } else if (!strcmp(p, "lines")) {
91 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
92 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
93 } else if (!strcmp(p, "files")) {
94 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
95 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
96 } else if (!strcmp(p, "noncumulative")) {
97 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
98 } else if (!strcmp(p, "cumulative")) {
99 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
100 } else if (isdigit(*p)) {
101 char *end;
102 int permille = strtoul(p, &end, 10) * 10;
103 if (*end == '.' && isdigit(*++end)) {
104 /* only use first digit */
105 permille += *end - '0';
106 /* .. and ignore any further digits */
107 while (isdigit(*++end))
108 ; /* nothing */
109 }
110 if (!*end)
111 options->dirstat_permille = permille;
112 else {
113 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
114 p);
115 ret++;
116 }
117 } else {
118 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
119 ret++;
120 }
121
122 }
123 string_list_clear(&params, 0);
124 free(params_copy);
125 return ret;
126 }
127
128 static int parse_submodule_params(struct diff_options *options, const char *value)
129 {
130 if (!strcmp(value, "log"))
131 DIFF_OPT_SET(options, SUBMODULE_LOG);
132 else if (!strcmp(value, "short"))
133 DIFF_OPT_CLR(options, SUBMODULE_LOG);
134 else
135 return -1;
136 return 0;
137 }
138
139 static int git_config_rename(const char *var, const char *value)
140 {
141 if (!value)
142 return DIFF_DETECT_RENAME;
143 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
144 return DIFF_DETECT_COPY;
145 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
146 }
147
148 long parse_algorithm_value(const char *value)
149 {
150 if (!value)
151 return -1;
152 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
153 return 0;
154 else if (!strcasecmp(value, "minimal"))
155 return XDF_NEED_MINIMAL;
156 else if (!strcasecmp(value, "patience"))
157 return XDF_PATIENCE_DIFF;
158 else if (!strcasecmp(value, "histogram"))
159 return XDF_HISTOGRAM_DIFF;
160 return -1;
161 }
162
163 /*
164 * These are to give UI layer defaults.
165 * The core-level commands such as git-diff-files should
166 * never be affected by the setting of diff.renames
167 * the user happens to have in the configuration file.
168 */
169 int git_diff_ui_config(const char *var, const char *value, void *cb)
170 {
171 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
172 diff_use_color_default = git_config_colorbool(var, value);
173 return 0;
174 }
175 if (!strcmp(var, "diff.context")) {
176 diff_context_default = git_config_int(var, value);
177 if (diff_context_default < 0)
178 return -1;
179 return 0;
180 }
181 if (!strcmp(var, "diff.renames")) {
182 diff_detect_rename_default = git_config_rename(var, value);
183 return 0;
184 }
185 if (!strcmp(var, "diff.autorefreshindex")) {
186 diff_auto_refresh_index = git_config_bool(var, value);
187 return 0;
188 }
189 if (!strcmp(var, "diff.mnemonicprefix")) {
190 diff_mnemonic_prefix = git_config_bool(var, value);
191 return 0;
192 }
193 if (!strcmp(var, "diff.noprefix")) {
194 diff_no_prefix = git_config_bool(var, value);
195 return 0;
196 }
197 if (!strcmp(var, "diff.statgraphwidth")) {
198 diff_stat_graph_width = git_config_int(var, value);
199 return 0;
200 }
201 if (!strcmp(var, "diff.external"))
202 return git_config_string(&external_diff_cmd_cfg, var, value);
203 if (!strcmp(var, "diff.wordregex"))
204 return git_config_string(&diff_word_regex_cfg, var, value);
205 if (!strcmp(var, "diff.orderfile"))
206 return git_config_pathname(&diff_order_file_cfg, var, value);
207
208 if (!strcmp(var, "diff.ignoresubmodules"))
209 handle_ignore_submodules_arg(&default_diff_options, value);
210
211 if (!strcmp(var, "diff.submodule")) {
212 if (parse_submodule_params(&default_diff_options, value))
213 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
214 value);
215 return 0;
216 }
217
218 if (!strcmp(var, "diff.algorithm")) {
219 diff_algorithm = parse_algorithm_value(value);
220 if (diff_algorithm < 0)
221 return -1;
222 return 0;
223 }
224
225 if (git_color_config(var, value, cb) < 0)
226 return -1;
227
228 return git_diff_basic_config(var, value, cb);
229 }
230
231 int git_diff_basic_config(const char *var, const char *value, void *cb)
232 {
233 if (!strcmp(var, "diff.renamelimit")) {
234 diff_rename_limit_default = git_config_int(var, value);
235 return 0;
236 }
237
238 if (userdiff_config(var, value) < 0)
239 return -1;
240
241 if (starts_with(var, "diff.color.") || starts_with(var, "color.diff.")) {
242 int slot = parse_diff_color_slot(var, 11);
243 if (slot < 0)
244 return 0;
245 if (!value)
246 return config_error_nonbool(var);
247 color_parse(value, var, diff_colors[slot]);
248 return 0;
249 }
250
251 /* like GNU diff's --suppress-blank-empty option */
252 if (!strcmp(var, "diff.suppressblankempty") ||
253 /* for backwards compatibility */
254 !strcmp(var, "diff.suppress-blank-empty")) {
255 diff_suppress_blank_empty = git_config_bool(var, value);
256 return 0;
257 }
258
259 if (!strcmp(var, "diff.dirstat")) {
260 struct strbuf errmsg = STRBUF_INIT;
261 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
262 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
263 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
264 errmsg.buf);
265 strbuf_release(&errmsg);
266 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
267 return 0;
268 }
269
270 if (starts_with(var, "submodule."))
271 return parse_submodule_config_option(var, value);
272
273 return git_default_config(var, value, cb);
274 }
275
276 static char *quote_two(const char *one, const char *two)
277 {
278 int need_one = quote_c_style(one, NULL, NULL, 1);
279 int need_two = quote_c_style(two, NULL, NULL, 1);
280 struct strbuf res = STRBUF_INIT;
281
282 if (need_one + need_two) {
283 strbuf_addch(&res, '"');
284 quote_c_style(one, &res, NULL, 1);
285 quote_c_style(two, &res, NULL, 1);
286 strbuf_addch(&res, '"');
287 } else {
288 strbuf_addstr(&res, one);
289 strbuf_addstr(&res, two);
290 }
291 return strbuf_detach(&res, NULL);
292 }
293
294 static const char *external_diff(void)
295 {
296 static const char *external_diff_cmd = NULL;
297 static int done_preparing = 0;
298
299 if (done_preparing)
300 return external_diff_cmd;
301 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
302 if (!external_diff_cmd)
303 external_diff_cmd = external_diff_cmd_cfg;
304 done_preparing = 1;
305 return external_diff_cmd;
306 }
307
308 static struct diff_tempfile {
309 const char *name; /* filename external diff should read from */
310 char hex[41];
311 char mode[10];
312 char tmp_path[PATH_MAX];
313 } diff_temp[2];
314
315 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
316
317 struct emit_callback {
318 int color_diff;
319 unsigned ws_rule;
320 int blank_at_eof_in_preimage;
321 int blank_at_eof_in_postimage;
322 int lno_in_preimage;
323 int lno_in_postimage;
324 sane_truncate_fn truncate;
325 const char **label_path;
326 struct diff_words_data *diff_words;
327 struct diff_options *opt;
328 int *found_changesp;
329 struct strbuf *header;
330 };
331
332 static int count_lines(const char *data, int size)
333 {
334 int count, ch, completely_empty = 1, nl_just_seen = 0;
335 count = 0;
336 while (0 < size--) {
337 ch = *data++;
338 if (ch == '\n') {
339 count++;
340 nl_just_seen = 1;
341 completely_empty = 0;
342 }
343 else {
344 nl_just_seen = 0;
345 completely_empty = 0;
346 }
347 }
348 if (completely_empty)
349 return 0;
350 if (!nl_just_seen)
351 count++; /* no trailing newline */
352 return count;
353 }
354
355 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
356 {
357 if (!DIFF_FILE_VALID(one)) {
358 mf->ptr = (char *)""; /* does not matter */
359 mf->size = 0;
360 return 0;
361 }
362 else if (diff_populate_filespec(one, 0))
363 return -1;
364
365 mf->ptr = one->data;
366 mf->size = one->size;
367 return 0;
368 }
369
370 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
371 static unsigned long diff_filespec_size(struct diff_filespec *one)
372 {
373 if (!DIFF_FILE_VALID(one))
374 return 0;
375 diff_populate_filespec(one, 1);
376 return one->size;
377 }
378
379 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
380 {
381 char *ptr = mf->ptr;
382 long size = mf->size;
383 int cnt = 0;
384
385 if (!size)
386 return cnt;
387 ptr += size - 1; /* pointing at the very end */
388 if (*ptr != '\n')
389 ; /* incomplete line */
390 else
391 ptr--; /* skip the last LF */
392 while (mf->ptr < ptr) {
393 char *prev_eol;
394 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
395 if (*prev_eol == '\n')
396 break;
397 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
398 break;
399 cnt++;
400 ptr = prev_eol - 1;
401 }
402 return cnt;
403 }
404
405 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
406 struct emit_callback *ecbdata)
407 {
408 int l1, l2, at;
409 unsigned ws_rule = ecbdata->ws_rule;
410 l1 = count_trailing_blank(mf1, ws_rule);
411 l2 = count_trailing_blank(mf2, ws_rule);
412 if (l2 <= l1) {
413 ecbdata->blank_at_eof_in_preimage = 0;
414 ecbdata->blank_at_eof_in_postimage = 0;
415 return;
416 }
417 at = count_lines(mf1->ptr, mf1->size);
418 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
419
420 at = count_lines(mf2->ptr, mf2->size);
421 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
422 }
423
424 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
425 int first, const char *line, int len)
426 {
427 int has_trailing_newline, has_trailing_carriage_return;
428 int nofirst;
429 FILE *file = o->file;
430
431 fputs(diff_line_prefix(o), file);
432
433 if (len == 0) {
434 has_trailing_newline = (first == '\n');
435 has_trailing_carriage_return = (!has_trailing_newline &&
436 (first == '\r'));
437 nofirst = has_trailing_newline || has_trailing_carriage_return;
438 } else {
439 has_trailing_newline = (len > 0 && line[len-1] == '\n');
440 if (has_trailing_newline)
441 len--;
442 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
443 if (has_trailing_carriage_return)
444 len--;
445 nofirst = 0;
446 }
447
448 if (len || !nofirst) {
449 fputs(set, file);
450 if (!nofirst)
451 fputc(first, file);
452 fwrite(line, len, 1, file);
453 fputs(reset, file);
454 }
455 if (has_trailing_carriage_return)
456 fputc('\r', file);
457 if (has_trailing_newline)
458 fputc('\n', file);
459 }
460
461 static void emit_line(struct diff_options *o, const char *set, const char *reset,
462 const char *line, int len)
463 {
464 emit_line_0(o, set, reset, line[0], line+1, len-1);
465 }
466
467 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
468 {
469 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
470 ecbdata->blank_at_eof_in_preimage &&
471 ecbdata->blank_at_eof_in_postimage &&
472 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
473 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
474 return 0;
475 return ws_blank_line(line, len, ecbdata->ws_rule);
476 }
477
478 static void emit_add_line(const char *reset,
479 struct emit_callback *ecbdata,
480 const char *line, int len)
481 {
482 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
483 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
484
485 if (!*ws)
486 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
487 else if (new_blank_line_at_eof(ecbdata, line, len))
488 /* Blank line at EOF - paint '+' as well */
489 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
490 else {
491 /* Emit just the prefix, then the rest. */
492 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
493 ws_check_emit(line, len, ecbdata->ws_rule,
494 ecbdata->opt->file, set, reset, ws);
495 }
496 }
497
498 static void emit_hunk_header(struct emit_callback *ecbdata,
499 const char *line, int len)
500 {
501 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
502 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
503 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
504 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
505 static const char atat[2] = { '@', '@' };
506 const char *cp, *ep;
507 struct strbuf msgbuf = STRBUF_INIT;
508 int org_len = len;
509 int i = 1;
510
511 /*
512 * As a hunk header must begin with "@@ -<old>, +<new> @@",
513 * it always is at least 10 bytes long.
514 */
515 if (len < 10 ||
516 memcmp(line, atat, 2) ||
517 !(ep = memmem(line + 2, len - 2, atat, 2))) {
518 emit_line(ecbdata->opt, plain, reset, line, len);
519 return;
520 }
521 ep += 2; /* skip over @@ */
522
523 /* The hunk header in fraginfo color */
524 strbuf_add(&msgbuf, frag, strlen(frag));
525 strbuf_add(&msgbuf, line, ep - line);
526 strbuf_add(&msgbuf, reset, strlen(reset));
527
528 /*
529 * trailing "\r\n"
530 */
531 for ( ; i < 3; i++)
532 if (line[len - i] == '\r' || line[len - i] == '\n')
533 len--;
534
535 /* blank before the func header */
536 for (cp = ep; ep - line < len; ep++)
537 if (*ep != ' ' && *ep != '\t')
538 break;
539 if (ep != cp) {
540 strbuf_add(&msgbuf, plain, strlen(plain));
541 strbuf_add(&msgbuf, cp, ep - cp);
542 strbuf_add(&msgbuf, reset, strlen(reset));
543 }
544
545 if (ep < line + len) {
546 strbuf_add(&msgbuf, func, strlen(func));
547 strbuf_add(&msgbuf, ep, line + len - ep);
548 strbuf_add(&msgbuf, reset, strlen(reset));
549 }
550
551 strbuf_add(&msgbuf, line + len, org_len - len);
552 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
553 strbuf_release(&msgbuf);
554 }
555
556 static struct diff_tempfile *claim_diff_tempfile(void) {
557 int i;
558 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
559 if (!diff_temp[i].name)
560 return diff_temp + i;
561 die("BUG: diff is failing to clean up its tempfiles");
562 }
563
564 static int remove_tempfile_installed;
565
566 static void remove_tempfile(void)
567 {
568 int i;
569 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
570 if (diff_temp[i].name == diff_temp[i].tmp_path)
571 unlink_or_warn(diff_temp[i].name);
572 diff_temp[i].name = NULL;
573 }
574 }
575
576 static void remove_tempfile_on_signal(int signo)
577 {
578 remove_tempfile();
579 sigchain_pop(signo);
580 raise(signo);
581 }
582
583 static void print_line_count(FILE *file, int count)
584 {
585 switch (count) {
586 case 0:
587 fprintf(file, "0,0");
588 break;
589 case 1:
590 fprintf(file, "1");
591 break;
592 default:
593 fprintf(file, "1,%d", count);
594 break;
595 }
596 }
597
598 static void emit_rewrite_lines(struct emit_callback *ecb,
599 int prefix, const char *data, int size)
600 {
601 const char *endp = NULL;
602 static const char *nneof = " No newline at end of file\n";
603 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
604 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
605
606 while (0 < size) {
607 int len;
608
609 endp = memchr(data, '\n', size);
610 len = endp ? (endp - data + 1) : size;
611 if (prefix != '+') {
612 ecb->lno_in_preimage++;
613 emit_line_0(ecb->opt, old, reset, '-',
614 data, len);
615 } else {
616 ecb->lno_in_postimage++;
617 emit_add_line(reset, ecb, data, len);
618 }
619 size -= len;
620 data += len;
621 }
622 if (!endp) {
623 const char *plain = diff_get_color(ecb->color_diff,
624 DIFF_PLAIN);
625 putc('\n', ecb->opt->file);
626 emit_line_0(ecb->opt, plain, reset, '\\',
627 nneof, strlen(nneof));
628 }
629 }
630
631 static void emit_rewrite_diff(const char *name_a,
632 const char *name_b,
633 struct diff_filespec *one,
634 struct diff_filespec *two,
635 struct userdiff_driver *textconv_one,
636 struct userdiff_driver *textconv_two,
637 struct diff_options *o)
638 {
639 int lc_a, lc_b;
640 const char *name_a_tab, *name_b_tab;
641 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
642 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
643 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
644 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
645 const char *a_prefix, *b_prefix;
646 char *data_one, *data_two;
647 size_t size_one, size_two;
648 struct emit_callback ecbdata;
649 const char *line_prefix = diff_line_prefix(o);
650
651 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
652 a_prefix = o->b_prefix;
653 b_prefix = o->a_prefix;
654 } else {
655 a_prefix = o->a_prefix;
656 b_prefix = o->b_prefix;
657 }
658
659 name_a += (*name_a == '/');
660 name_b += (*name_b == '/');
661 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
662 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
663
664 strbuf_reset(&a_name);
665 strbuf_reset(&b_name);
666 quote_two_c_style(&a_name, a_prefix, name_a, 0);
667 quote_two_c_style(&b_name, b_prefix, name_b, 0);
668
669 size_one = fill_textconv(textconv_one, one, &data_one);
670 size_two = fill_textconv(textconv_two, two, &data_two);
671
672 memset(&ecbdata, 0, sizeof(ecbdata));
673 ecbdata.color_diff = want_color(o->use_color);
674 ecbdata.found_changesp = &o->found_changes;
675 ecbdata.ws_rule = whitespace_rule(name_b);
676 ecbdata.opt = o;
677 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
678 mmfile_t mf1, mf2;
679 mf1.ptr = (char *)data_one;
680 mf2.ptr = (char *)data_two;
681 mf1.size = size_one;
682 mf2.size = size_two;
683 check_blank_at_eof(&mf1, &mf2, &ecbdata);
684 }
685 ecbdata.lno_in_preimage = 1;
686 ecbdata.lno_in_postimage = 1;
687
688 lc_a = count_lines(data_one, size_one);
689 lc_b = count_lines(data_two, size_two);
690 fprintf(o->file,
691 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
692 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
693 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
694 line_prefix, fraginfo);
695 if (!o->irreversible_delete)
696 print_line_count(o->file, lc_a);
697 else
698 fprintf(o->file, "?,?");
699 fprintf(o->file, " +");
700 print_line_count(o->file, lc_b);
701 fprintf(o->file, " @@%s\n", reset);
702 if (lc_a && !o->irreversible_delete)
703 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
704 if (lc_b)
705 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
706 if (textconv_one)
707 free((char *)data_one);
708 if (textconv_two)
709 free((char *)data_two);
710 }
711
712 struct diff_words_buffer {
713 mmfile_t text;
714 long alloc;
715 struct diff_words_orig {
716 const char *begin, *end;
717 } *orig;
718 int orig_nr, orig_alloc;
719 };
720
721 static void diff_words_append(char *line, unsigned long len,
722 struct diff_words_buffer *buffer)
723 {
724 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
725 line++;
726 len--;
727 memcpy(buffer->text.ptr + buffer->text.size, line, len);
728 buffer->text.size += len;
729 buffer->text.ptr[buffer->text.size] = '\0';
730 }
731
732 struct diff_words_style_elem {
733 const char *prefix;
734 const char *suffix;
735 const char *color; /* NULL; filled in by the setup code if
736 * color is enabled */
737 };
738
739 struct diff_words_style {
740 enum diff_words_type type;
741 struct diff_words_style_elem new, old, ctx;
742 const char *newline;
743 };
744
745 static struct diff_words_style diff_words_styles[] = {
746 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
747 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
748 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
749 };
750
751 struct diff_words_data {
752 struct diff_words_buffer minus, plus;
753 const char *current_plus;
754 int last_minus;
755 struct diff_options *opt;
756 regex_t *word_regex;
757 enum diff_words_type type;
758 struct diff_words_style *style;
759 };
760
761 static int fn_out_diff_words_write_helper(FILE *fp,
762 struct diff_words_style_elem *st_el,
763 const char *newline,
764 size_t count, const char *buf,
765 const char *line_prefix)
766 {
767 int print = 0;
768
769 while (count) {
770 char *p = memchr(buf, '\n', count);
771 if (print)
772 fputs(line_prefix, fp);
773 if (p != buf) {
774 if (st_el->color && fputs(st_el->color, fp) < 0)
775 return -1;
776 if (fputs(st_el->prefix, fp) < 0 ||
777 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
778 fputs(st_el->suffix, fp) < 0)
779 return -1;
780 if (st_el->color && *st_el->color
781 && fputs(GIT_COLOR_RESET, fp) < 0)
782 return -1;
783 }
784 if (!p)
785 return 0;
786 if (fputs(newline, fp) < 0)
787 return -1;
788 count -= p + 1 - buf;
789 buf = p + 1;
790 print = 1;
791 }
792 return 0;
793 }
794
795 /*
796 * '--color-words' algorithm can be described as:
797 *
798 * 1. collect a the minus/plus lines of a diff hunk, divided into
799 * minus-lines and plus-lines;
800 *
801 * 2. break both minus-lines and plus-lines into words and
802 * place them into two mmfile_t with one word for each line;
803 *
804 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
805 *
806 * And for the common parts of the both file, we output the plus side text.
807 * diff_words->current_plus is used to trace the current position of the plus file
808 * which printed. diff_words->last_minus is used to trace the last minus word
809 * printed.
810 *
811 * For '--graph' to work with '--color-words', we need to output the graph prefix
812 * on each line of color words output. Generally, there are two conditions on
813 * which we should output the prefix.
814 *
815 * 1. diff_words->last_minus == 0 &&
816 * diff_words->current_plus == diff_words->plus.text.ptr
817 *
818 * that is: the plus text must start as a new line, and if there is no minus
819 * word printed, a graph prefix must be printed.
820 *
821 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
822 * *(diff_words->current_plus - 1) == '\n'
823 *
824 * that is: a graph prefix must be printed following a '\n'
825 */
826 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
827 {
828 if ((diff_words->last_minus == 0 &&
829 diff_words->current_plus == diff_words->plus.text.ptr) ||
830 (diff_words->current_plus > diff_words->plus.text.ptr &&
831 *(diff_words->current_plus - 1) == '\n')) {
832 return 1;
833 } else {
834 return 0;
835 }
836 }
837
838 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
839 {
840 struct diff_words_data *diff_words = priv;
841 struct diff_words_style *style = diff_words->style;
842 int minus_first, minus_len, plus_first, plus_len;
843 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
844 struct diff_options *opt = diff_words->opt;
845 const char *line_prefix;
846
847 if (line[0] != '@' || parse_hunk_header(line, len,
848 &minus_first, &minus_len, &plus_first, &plus_len))
849 return;
850
851 assert(opt);
852 line_prefix = diff_line_prefix(opt);
853
854 /* POSIX requires that first be decremented by one if len == 0... */
855 if (minus_len) {
856 minus_begin = diff_words->minus.orig[minus_first].begin;
857 minus_end =
858 diff_words->minus.orig[minus_first + minus_len - 1].end;
859 } else
860 minus_begin = minus_end =
861 diff_words->minus.orig[minus_first].end;
862
863 if (plus_len) {
864 plus_begin = diff_words->plus.orig[plus_first].begin;
865 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
866 } else
867 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
868
869 if (color_words_output_graph_prefix(diff_words)) {
870 fputs(line_prefix, diff_words->opt->file);
871 }
872 if (diff_words->current_plus != plus_begin) {
873 fn_out_diff_words_write_helper(diff_words->opt->file,
874 &style->ctx, style->newline,
875 plus_begin - diff_words->current_plus,
876 diff_words->current_plus, line_prefix);
877 if (*(plus_begin - 1) == '\n')
878 fputs(line_prefix, diff_words->opt->file);
879 }
880 if (minus_begin != minus_end) {
881 fn_out_diff_words_write_helper(diff_words->opt->file,
882 &style->old, style->newline,
883 minus_end - minus_begin, minus_begin,
884 line_prefix);
885 }
886 if (plus_begin != plus_end) {
887 fn_out_diff_words_write_helper(diff_words->opt->file,
888 &style->new, style->newline,
889 plus_end - plus_begin, plus_begin,
890 line_prefix);
891 }
892
893 diff_words->current_plus = plus_end;
894 diff_words->last_minus = minus_first;
895 }
896
897 /* This function starts looking at *begin, and returns 0 iff a word was found. */
898 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
899 int *begin, int *end)
900 {
901 if (word_regex && *begin < buffer->size) {
902 regmatch_t match[1];
903 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
904 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
905 '\n', match[0].rm_eo - match[0].rm_so);
906 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
907 *begin += match[0].rm_so;
908 return *begin >= *end;
909 }
910 return -1;
911 }
912
913 /* find the next word */
914 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
915 (*begin)++;
916 if (*begin >= buffer->size)
917 return -1;
918
919 /* find the end of the word */
920 *end = *begin + 1;
921 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
922 (*end)++;
923
924 return 0;
925 }
926
927 /*
928 * This function splits the words in buffer->text, stores the list with
929 * newline separator into out, and saves the offsets of the original words
930 * in buffer->orig.
931 */
932 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
933 regex_t *word_regex)
934 {
935 int i, j;
936 long alloc = 0;
937
938 out->size = 0;
939 out->ptr = NULL;
940
941 /* fake an empty "0th" word */
942 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
943 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
944 buffer->orig_nr = 1;
945
946 for (i = 0; i < buffer->text.size; i++) {
947 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
948 return;
949
950 /* store original boundaries */
951 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
952 buffer->orig_alloc);
953 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
954 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
955 buffer->orig_nr++;
956
957 /* store one word */
958 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
959 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
960 out->ptr[out->size + j - i] = '\n';
961 out->size += j - i + 1;
962
963 i = j - 1;
964 }
965 }
966
967 /* this executes the word diff on the accumulated buffers */
968 static void diff_words_show(struct diff_words_data *diff_words)
969 {
970 xpparam_t xpp;
971 xdemitconf_t xecfg;
972 mmfile_t minus, plus;
973 struct diff_words_style *style = diff_words->style;
974
975 struct diff_options *opt = diff_words->opt;
976 const char *line_prefix;
977
978 assert(opt);
979 line_prefix = diff_line_prefix(opt);
980
981 /* special case: only removal */
982 if (!diff_words->plus.text.size) {
983 fputs(line_prefix, diff_words->opt->file);
984 fn_out_diff_words_write_helper(diff_words->opt->file,
985 &style->old, style->newline,
986 diff_words->minus.text.size,
987 diff_words->minus.text.ptr, line_prefix);
988 diff_words->minus.text.size = 0;
989 return;
990 }
991
992 diff_words->current_plus = diff_words->plus.text.ptr;
993 diff_words->last_minus = 0;
994
995 memset(&xpp, 0, sizeof(xpp));
996 memset(&xecfg, 0, sizeof(xecfg));
997 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
998 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
999 xpp.flags = 0;
1000 /* as only the hunk header will be parsed, we need a 0-context */
1001 xecfg.ctxlen = 0;
1002 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1003 &xpp, &xecfg);
1004 free(minus.ptr);
1005 free(plus.ptr);
1006 if (diff_words->current_plus != diff_words->plus.text.ptr +
1007 diff_words->plus.text.size) {
1008 if (color_words_output_graph_prefix(diff_words))
1009 fputs(line_prefix, diff_words->opt->file);
1010 fn_out_diff_words_write_helper(diff_words->opt->file,
1011 &style->ctx, style->newline,
1012 diff_words->plus.text.ptr + diff_words->plus.text.size
1013 - diff_words->current_plus, diff_words->current_plus,
1014 line_prefix);
1015 }
1016 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1017 }
1018
1019 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1020 static void diff_words_flush(struct emit_callback *ecbdata)
1021 {
1022 if (ecbdata->diff_words->minus.text.size ||
1023 ecbdata->diff_words->plus.text.size)
1024 diff_words_show(ecbdata->diff_words);
1025 }
1026
1027 static void diff_filespec_load_driver(struct diff_filespec *one)
1028 {
1029 /* Use already-loaded driver */
1030 if (one->driver)
1031 return;
1032
1033 if (S_ISREG(one->mode))
1034 one->driver = userdiff_find_by_path(one->path);
1035
1036 /* Fallback to default settings */
1037 if (!one->driver)
1038 one->driver = userdiff_find_by_name("default");
1039 }
1040
1041 static const char *userdiff_word_regex(struct diff_filespec *one)
1042 {
1043 diff_filespec_load_driver(one);
1044 return one->driver->word_regex;
1045 }
1046
1047 static void init_diff_words_data(struct emit_callback *ecbdata,
1048 struct diff_options *orig_opts,
1049 struct diff_filespec *one,
1050 struct diff_filespec *two)
1051 {
1052 int i;
1053 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1054 memcpy(o, orig_opts, sizeof(struct diff_options));
1055
1056 ecbdata->diff_words =
1057 xcalloc(1, sizeof(struct diff_words_data));
1058 ecbdata->diff_words->type = o->word_diff;
1059 ecbdata->diff_words->opt = o;
1060 if (!o->word_regex)
1061 o->word_regex = userdiff_word_regex(one);
1062 if (!o->word_regex)
1063 o->word_regex = userdiff_word_regex(two);
1064 if (!o->word_regex)
1065 o->word_regex = diff_word_regex_cfg;
1066 if (o->word_regex) {
1067 ecbdata->diff_words->word_regex = (regex_t *)
1068 xmalloc(sizeof(regex_t));
1069 if (regcomp(ecbdata->diff_words->word_regex,
1070 o->word_regex,
1071 REG_EXTENDED | REG_NEWLINE))
1072 die ("Invalid regular expression: %s",
1073 o->word_regex);
1074 }
1075 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1076 if (o->word_diff == diff_words_styles[i].type) {
1077 ecbdata->diff_words->style =
1078 &diff_words_styles[i];
1079 break;
1080 }
1081 }
1082 if (want_color(o->use_color)) {
1083 struct diff_words_style *st = ecbdata->diff_words->style;
1084 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1085 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1086 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1087 }
1088 }
1089
1090 static void free_diff_words_data(struct emit_callback *ecbdata)
1091 {
1092 if (ecbdata->diff_words) {
1093 diff_words_flush(ecbdata);
1094 free (ecbdata->diff_words->opt);
1095 free (ecbdata->diff_words->minus.text.ptr);
1096 free (ecbdata->diff_words->minus.orig);
1097 free (ecbdata->diff_words->plus.text.ptr);
1098 free (ecbdata->diff_words->plus.orig);
1099 if (ecbdata->diff_words->word_regex) {
1100 regfree(ecbdata->diff_words->word_regex);
1101 free(ecbdata->diff_words->word_regex);
1102 }
1103 free(ecbdata->diff_words);
1104 ecbdata->diff_words = NULL;
1105 }
1106 }
1107
1108 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1109 {
1110 if (want_color(diff_use_color))
1111 return diff_colors[ix];
1112 return "";
1113 }
1114
1115 const char *diff_line_prefix(struct diff_options *opt)
1116 {
1117 struct strbuf *msgbuf;
1118 if (!opt->output_prefix)
1119 return "";
1120
1121 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1122 return msgbuf->buf;
1123 }
1124
1125 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1126 {
1127 const char *cp;
1128 unsigned long allot;
1129 size_t l = len;
1130
1131 if (ecb->truncate)
1132 return ecb->truncate(line, len);
1133 cp = line;
1134 allot = l;
1135 while (0 < l) {
1136 (void) utf8_width(&cp, &l);
1137 if (!cp)
1138 break; /* truncated in the middle? */
1139 }
1140 return allot - l;
1141 }
1142
1143 static void find_lno(const char *line, struct emit_callback *ecbdata)
1144 {
1145 const char *p;
1146 ecbdata->lno_in_preimage = 0;
1147 ecbdata->lno_in_postimage = 0;
1148 p = strchr(line, '-');
1149 if (!p)
1150 return; /* cannot happen */
1151 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1152 p = strchr(p, '+');
1153 if (!p)
1154 return; /* cannot happen */
1155 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1156 }
1157
1158 static void fn_out_consume(void *priv, char *line, unsigned long len)
1159 {
1160 struct emit_callback *ecbdata = priv;
1161 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1162 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1163 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1164 struct diff_options *o = ecbdata->opt;
1165 const char *line_prefix = diff_line_prefix(o);
1166
1167 if (ecbdata->header) {
1168 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1169 strbuf_reset(ecbdata->header);
1170 ecbdata->header = NULL;
1171 }
1172 *(ecbdata->found_changesp) = 1;
1173
1174 if (ecbdata->label_path[0]) {
1175 const char *name_a_tab, *name_b_tab;
1176
1177 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1178 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1179
1180 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1181 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1182 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1183 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1184 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1185 }
1186
1187 if (diff_suppress_blank_empty
1188 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1189 line[0] = '\n';
1190 len = 1;
1191 }
1192
1193 if (line[0] == '@') {
1194 if (ecbdata->diff_words)
1195 diff_words_flush(ecbdata);
1196 len = sane_truncate_line(ecbdata, line, len);
1197 find_lno(line, ecbdata);
1198 emit_hunk_header(ecbdata, line, len);
1199 if (line[len-1] != '\n')
1200 putc('\n', ecbdata->opt->file);
1201 return;
1202 }
1203
1204 if (len < 1) {
1205 emit_line(ecbdata->opt, reset, reset, line, len);
1206 if (ecbdata->diff_words
1207 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1208 fputs("~\n", ecbdata->opt->file);
1209 return;
1210 }
1211
1212 if (ecbdata->diff_words) {
1213 if (line[0] == '-') {
1214 diff_words_append(line, len,
1215 &ecbdata->diff_words->minus);
1216 return;
1217 } else if (line[0] == '+') {
1218 diff_words_append(line, len,
1219 &ecbdata->diff_words->plus);
1220 return;
1221 } else if (starts_with(line, "\\ ")) {
1222 /*
1223 * Eat the "no newline at eof" marker as if we
1224 * saw a "+" or "-" line with nothing on it,
1225 * and return without diff_words_flush() to
1226 * defer processing. If this is the end of
1227 * preimage, more "+" lines may come after it.
1228 */
1229 return;
1230 }
1231 diff_words_flush(ecbdata);
1232 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1233 emit_line(ecbdata->opt, plain, reset, line, len);
1234 fputs("~\n", ecbdata->opt->file);
1235 } else {
1236 /*
1237 * Skip the prefix character, if any. With
1238 * diff_suppress_blank_empty, there may be
1239 * none.
1240 */
1241 if (line[0] != '\n') {
1242 line++;
1243 len--;
1244 }
1245 emit_line(ecbdata->opt, plain, reset, line, len);
1246 }
1247 return;
1248 }
1249
1250 if (line[0] != '+') {
1251 const char *color =
1252 diff_get_color(ecbdata->color_diff,
1253 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1254 ecbdata->lno_in_preimage++;
1255 if (line[0] == ' ')
1256 ecbdata->lno_in_postimage++;
1257 emit_line(ecbdata->opt, color, reset, line, len);
1258 } else {
1259 ecbdata->lno_in_postimage++;
1260 emit_add_line(reset, ecbdata, line + 1, len - 1);
1261 }
1262 }
1263
1264 static char *pprint_rename(const char *a, const char *b)
1265 {
1266 const char *old = a;
1267 const char *new = b;
1268 struct strbuf name = STRBUF_INIT;
1269 int pfx_length, sfx_length;
1270 int pfx_adjust_for_slash;
1271 int len_a = strlen(a);
1272 int len_b = strlen(b);
1273 int a_midlen, b_midlen;
1274 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1275 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1276
1277 if (qlen_a || qlen_b) {
1278 quote_c_style(a, &name, NULL, 0);
1279 strbuf_addstr(&name, " => ");
1280 quote_c_style(b, &name, NULL, 0);
1281 return strbuf_detach(&name, NULL);
1282 }
1283
1284 /* Find common prefix */
1285 pfx_length = 0;
1286 while (*old && *new && *old == *new) {
1287 if (*old == '/')
1288 pfx_length = old - a + 1;
1289 old++;
1290 new++;
1291 }
1292
1293 /* Find common suffix */
1294 old = a + len_a;
1295 new = b + len_b;
1296 sfx_length = 0;
1297 /*
1298 * If there is a common prefix, it must end in a slash. In
1299 * that case we let this loop run 1 into the prefix to see the
1300 * same slash.
1301 *
1302 * If there is no common prefix, we cannot do this as it would
1303 * underrun the input strings.
1304 */
1305 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1306 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1307 b + pfx_length - pfx_adjust_for_slash <= new &&
1308 *old == *new) {
1309 if (*old == '/')
1310 sfx_length = len_a - (old - a);
1311 old--;
1312 new--;
1313 }
1314
1315 /*
1316 * pfx{mid-a => mid-b}sfx
1317 * {pfx-a => pfx-b}sfx
1318 * pfx{sfx-a => sfx-b}
1319 * name-a => name-b
1320 */
1321 a_midlen = len_a - pfx_length - sfx_length;
1322 b_midlen = len_b - pfx_length - sfx_length;
1323 if (a_midlen < 0)
1324 a_midlen = 0;
1325 if (b_midlen < 0)
1326 b_midlen = 0;
1327
1328 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1329 if (pfx_length + sfx_length) {
1330 strbuf_add(&name, a, pfx_length);
1331 strbuf_addch(&name, '{');
1332 }
1333 strbuf_add(&name, a + pfx_length, a_midlen);
1334 strbuf_addstr(&name, " => ");
1335 strbuf_add(&name, b + pfx_length, b_midlen);
1336 if (pfx_length + sfx_length) {
1337 strbuf_addch(&name, '}');
1338 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1339 }
1340 return strbuf_detach(&name, NULL);
1341 }
1342
1343 struct diffstat_t {
1344 int nr;
1345 int alloc;
1346 struct diffstat_file {
1347 char *from_name;
1348 char *name;
1349 char *print_name;
1350 unsigned is_unmerged:1;
1351 unsigned is_binary:1;
1352 unsigned is_renamed:1;
1353 unsigned is_interesting:1;
1354 uintmax_t added, deleted;
1355 } **files;
1356 };
1357
1358 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1359 const char *name_a,
1360 const char *name_b)
1361 {
1362 struct diffstat_file *x;
1363 x = xcalloc(sizeof (*x), 1);
1364 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1365 diffstat->files[diffstat->nr++] = x;
1366 if (name_b) {
1367 x->from_name = xstrdup(name_a);
1368 x->name = xstrdup(name_b);
1369 x->is_renamed = 1;
1370 }
1371 else {
1372 x->from_name = NULL;
1373 x->name = xstrdup(name_a);
1374 }
1375 return x;
1376 }
1377
1378 static void diffstat_consume(void *priv, char *line, unsigned long len)
1379 {
1380 struct diffstat_t *diffstat = priv;
1381 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1382
1383 if (line[0] == '+')
1384 x->added++;
1385 else if (line[0] == '-')
1386 x->deleted++;
1387 }
1388
1389 const char mime_boundary_leader[] = "------------";
1390
1391 static int scale_linear(int it, int width, int max_change)
1392 {
1393 if (!it)
1394 return 0;
1395 /*
1396 * make sure that at least one '-' or '+' is printed if
1397 * there is any change to this path. The easiest way is to
1398 * scale linearly as if the alloted width is one column shorter
1399 * than it is, and then add 1 to the result.
1400 */
1401 return 1 + (it * (width - 1) / max_change);
1402 }
1403
1404 static void show_name(FILE *file,
1405 const char *prefix, const char *name, int len)
1406 {
1407 fprintf(file, " %s%-*s |", prefix, len, name);
1408 }
1409
1410 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1411 {
1412 if (cnt <= 0)
1413 return;
1414 fprintf(file, "%s", set);
1415 while (cnt--)
1416 putc(ch, file);
1417 fprintf(file, "%s", reset);
1418 }
1419
1420 static void fill_print_name(struct diffstat_file *file)
1421 {
1422 char *pname;
1423
1424 if (file->print_name)
1425 return;
1426
1427 if (!file->is_renamed) {
1428 struct strbuf buf = STRBUF_INIT;
1429 if (quote_c_style(file->name, &buf, NULL, 0)) {
1430 pname = strbuf_detach(&buf, NULL);
1431 } else {
1432 pname = file->name;
1433 strbuf_release(&buf);
1434 }
1435 } else {
1436 pname = pprint_rename(file->from_name, file->name);
1437 }
1438 file->print_name = pname;
1439 }
1440
1441 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1442 {
1443 struct strbuf sb = STRBUF_INIT;
1444 int ret;
1445
1446 if (!files) {
1447 assert(insertions == 0 && deletions == 0);
1448 return fprintf(fp, "%s\n", " 0 files changed");
1449 }
1450
1451 strbuf_addf(&sb,
1452 (files == 1) ? " %d file changed" : " %d files changed",
1453 files);
1454
1455 /*
1456 * For binary diff, the caller may want to print "x files
1457 * changed" with insertions == 0 && deletions == 0.
1458 *
1459 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1460 * is probably less confusing (i.e skip over "2 files changed
1461 * but nothing about added/removed lines? Is this a bug in Git?").
1462 */
1463 if (insertions || deletions == 0) {
1464 /*
1465 * TRANSLATORS: "+" in (+) is a line addition marker;
1466 * do not translate it.
1467 */
1468 strbuf_addf(&sb,
1469 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1470 insertions);
1471 }
1472
1473 if (deletions || insertions == 0) {
1474 /*
1475 * TRANSLATORS: "-" in (-) is a line removal marker;
1476 * do not translate it.
1477 */
1478 strbuf_addf(&sb,
1479 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1480 deletions);
1481 }
1482 strbuf_addch(&sb, '\n');
1483 ret = fputs(sb.buf, fp);
1484 strbuf_release(&sb);
1485 return ret;
1486 }
1487
1488 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1489 {
1490 int i, len, add, del, adds = 0, dels = 0;
1491 uintmax_t max_change = 0, max_len = 0;
1492 int total_files = data->nr, count;
1493 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1494 const char *reset, *add_c, *del_c;
1495 const char *line_prefix = "";
1496 int extra_shown = 0;
1497
1498 if (data->nr == 0)
1499 return;
1500
1501 line_prefix = diff_line_prefix(options);
1502 count = options->stat_count ? options->stat_count : data->nr;
1503
1504 reset = diff_get_color_opt(options, DIFF_RESET);
1505 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1506 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1507
1508 /*
1509 * Find the longest filename and max number of changes
1510 */
1511 for (i = 0; (i < count) && (i < data->nr); i++) {
1512 struct diffstat_file *file = data->files[i];
1513 uintmax_t change = file->added + file->deleted;
1514
1515 if (!file->is_interesting && (change == 0)) {
1516 count++; /* not shown == room for one more */
1517 continue;
1518 }
1519 fill_print_name(file);
1520 len = strlen(file->print_name);
1521 if (max_len < len)
1522 max_len = len;
1523
1524 if (file->is_unmerged) {
1525 /* "Unmerged" is 8 characters */
1526 bin_width = bin_width < 8 ? 8 : bin_width;
1527 continue;
1528 }
1529 if (file->is_binary) {
1530 /* "Bin XXX -> YYY bytes" */
1531 int w = 14 + decimal_width(file->added)
1532 + decimal_width(file->deleted);
1533 bin_width = bin_width < w ? w : bin_width;
1534 /* Display change counts aligned with "Bin" */
1535 number_width = 3;
1536 continue;
1537 }
1538
1539 if (max_change < change)
1540 max_change = change;
1541 }
1542 count = i; /* where we can stop scanning in data->files[] */
1543
1544 /*
1545 * We have width = stat_width or term_columns() columns total.
1546 * We want a maximum of min(max_len, stat_name_width) for the name part.
1547 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1548 * We also need 1 for " " and 4 + decimal_width(max_change)
1549 * for " | NNNN " and one the empty column at the end, altogether
1550 * 6 + decimal_width(max_change).
1551 *
1552 * If there's not enough space, we will use the smaller of
1553 * stat_name_width (if set) and 5/8*width for the filename,
1554 * and the rest for constant elements + graph part, but no more
1555 * than stat_graph_width for the graph part.
1556 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1557 * for the standard terminal size).
1558 *
1559 * In other words: stat_width limits the maximum width, and
1560 * stat_name_width fixes the maximum width of the filename,
1561 * and is also used to divide available columns if there
1562 * aren't enough.
1563 *
1564 * Binary files are displayed with "Bin XXX -> YYY bytes"
1565 * instead of the change count and graph. This part is treated
1566 * similarly to the graph part, except that it is not
1567 * "scaled". If total width is too small to accommodate the
1568 * guaranteed minimum width of the filename part and the
1569 * separators and this message, this message will "overflow"
1570 * making the line longer than the maximum width.
1571 */
1572
1573 if (options->stat_width == -1)
1574 width = term_columns() - options->output_prefix_length;
1575 else
1576 width = options->stat_width ? options->stat_width : 80;
1577 number_width = decimal_width(max_change) > number_width ?
1578 decimal_width(max_change) : number_width;
1579
1580 if (options->stat_graph_width == -1)
1581 options->stat_graph_width = diff_stat_graph_width;
1582
1583 /*
1584 * Guarantee 3/8*16==6 for the graph part
1585 * and 5/8*16==10 for the filename part
1586 */
1587 if (width < 16 + 6 + number_width)
1588 width = 16 + 6 + number_width;
1589
1590 /*
1591 * First assign sizes that are wanted, ignoring available width.
1592 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1593 * starting from "XXX" should fit in graph_width.
1594 */
1595 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1596 if (options->stat_graph_width &&
1597 options->stat_graph_width < graph_width)
1598 graph_width = options->stat_graph_width;
1599
1600 name_width = (options->stat_name_width > 0 &&
1601 options->stat_name_width < max_len) ?
1602 options->stat_name_width : max_len;
1603
1604 /*
1605 * Adjust adjustable widths not to exceed maximum width
1606 */
1607 if (name_width + number_width + 6 + graph_width > width) {
1608 if (graph_width > width * 3/8 - number_width - 6) {
1609 graph_width = width * 3/8 - number_width - 6;
1610 if (graph_width < 6)
1611 graph_width = 6;
1612 }
1613
1614 if (options->stat_graph_width &&
1615 graph_width > options->stat_graph_width)
1616 graph_width = options->stat_graph_width;
1617 if (name_width > width - number_width - 6 - graph_width)
1618 name_width = width - number_width - 6 - graph_width;
1619 else
1620 graph_width = width - number_width - 6 - name_width;
1621 }
1622
1623 /*
1624 * From here name_width is the width of the name area,
1625 * and graph_width is the width of the graph area.
1626 * max_change is used to scale graph properly.
1627 */
1628 for (i = 0; i < count; i++) {
1629 const char *prefix = "";
1630 struct diffstat_file *file = data->files[i];
1631 char *name = file->print_name;
1632 uintmax_t added = file->added;
1633 uintmax_t deleted = file->deleted;
1634 int name_len;
1635
1636 if (!file->is_interesting && (added + deleted == 0))
1637 continue;
1638
1639 /*
1640 * "scale" the filename
1641 */
1642 len = name_width;
1643 name_len = strlen(name);
1644 if (name_width < name_len) {
1645 char *slash;
1646 prefix = "...";
1647 len -= 3;
1648 name += name_len - len;
1649 slash = strchr(name, '/');
1650 if (slash)
1651 name = slash;
1652 }
1653
1654 if (file->is_binary) {
1655 fprintf(options->file, "%s", line_prefix);
1656 show_name(options->file, prefix, name, len);
1657 fprintf(options->file, " %*s", number_width, "Bin");
1658 if (!added && !deleted) {
1659 putc('\n', options->file);
1660 continue;
1661 }
1662 fprintf(options->file, " %s%"PRIuMAX"%s",
1663 del_c, deleted, reset);
1664 fprintf(options->file, " -> ");
1665 fprintf(options->file, "%s%"PRIuMAX"%s",
1666 add_c, added, reset);
1667 fprintf(options->file, " bytes");
1668 fprintf(options->file, "\n");
1669 continue;
1670 }
1671 else if (file->is_unmerged) {
1672 fprintf(options->file, "%s", line_prefix);
1673 show_name(options->file, prefix, name, len);
1674 fprintf(options->file, " Unmerged\n");
1675 continue;
1676 }
1677
1678 /*
1679 * scale the add/delete
1680 */
1681 add = added;
1682 del = deleted;
1683
1684 if (graph_width <= max_change) {
1685 int total = scale_linear(add + del, graph_width, max_change);
1686 if (total < 2 && add && del)
1687 /* width >= 2 due to the sanity check */
1688 total = 2;
1689 if (add < del) {
1690 add = scale_linear(add, graph_width, max_change);
1691 del = total - add;
1692 } else {
1693 del = scale_linear(del, graph_width, max_change);
1694 add = total - del;
1695 }
1696 }
1697 fprintf(options->file, "%s", line_prefix);
1698 show_name(options->file, prefix, name, len);
1699 fprintf(options->file, " %*"PRIuMAX"%s",
1700 number_width, added + deleted,
1701 added + deleted ? " " : "");
1702 show_graph(options->file, '+', add, add_c, reset);
1703 show_graph(options->file, '-', del, del_c, reset);
1704 fprintf(options->file, "\n");
1705 }
1706
1707 for (i = 0; i < data->nr; i++) {
1708 struct diffstat_file *file = data->files[i];
1709 uintmax_t added = file->added;
1710 uintmax_t deleted = file->deleted;
1711
1712 if (file->is_unmerged ||
1713 (!file->is_interesting && (added + deleted == 0))) {
1714 total_files--;
1715 continue;
1716 }
1717
1718 if (!file->is_binary) {
1719 adds += added;
1720 dels += deleted;
1721 }
1722 if (i < count)
1723 continue;
1724 if (!extra_shown)
1725 fprintf(options->file, "%s ...\n", line_prefix);
1726 extra_shown = 1;
1727 }
1728 fprintf(options->file, "%s", line_prefix);
1729 print_stat_summary(options->file, total_files, adds, dels);
1730 }
1731
1732 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1733 {
1734 int i, adds = 0, dels = 0, total_files = data->nr;
1735
1736 if (data->nr == 0)
1737 return;
1738
1739 for (i = 0; i < data->nr; i++) {
1740 int added = data->files[i]->added;
1741 int deleted= data->files[i]->deleted;
1742
1743 if (data->files[i]->is_unmerged ||
1744 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1745 total_files--;
1746 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1747 adds += added;
1748 dels += deleted;
1749 }
1750 }
1751 fprintf(options->file, "%s", diff_line_prefix(options));
1752 print_stat_summary(options->file, total_files, adds, dels);
1753 }
1754
1755 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1756 {
1757 int i;
1758
1759 if (data->nr == 0)
1760 return;
1761
1762 for (i = 0; i < data->nr; i++) {
1763 struct diffstat_file *file = data->files[i];
1764
1765 fprintf(options->file, "%s", diff_line_prefix(options));
1766
1767 if (file->is_binary)
1768 fprintf(options->file, "-\t-\t");
1769 else
1770 fprintf(options->file,
1771 "%"PRIuMAX"\t%"PRIuMAX"\t",
1772 file->added, file->deleted);
1773 if (options->line_termination) {
1774 fill_print_name(file);
1775 if (!file->is_renamed)
1776 write_name_quoted(file->name, options->file,
1777 options->line_termination);
1778 else {
1779 fputs(file->print_name, options->file);
1780 putc(options->line_termination, options->file);
1781 }
1782 } else {
1783 if (file->is_renamed) {
1784 putc('\0', options->file);
1785 write_name_quoted(file->from_name, options->file, '\0');
1786 }
1787 write_name_quoted(file->name, options->file, '\0');
1788 }
1789 }
1790 }
1791
1792 struct dirstat_file {
1793 const char *name;
1794 unsigned long changed;
1795 };
1796
1797 struct dirstat_dir {
1798 struct dirstat_file *files;
1799 int alloc, nr, permille, cumulative;
1800 };
1801
1802 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1803 unsigned long changed, const char *base, int baselen)
1804 {
1805 unsigned long this_dir = 0;
1806 unsigned int sources = 0;
1807 const char *line_prefix = diff_line_prefix(opt);
1808
1809 while (dir->nr) {
1810 struct dirstat_file *f = dir->files;
1811 int namelen = strlen(f->name);
1812 unsigned long this;
1813 char *slash;
1814
1815 if (namelen < baselen)
1816 break;
1817 if (memcmp(f->name, base, baselen))
1818 break;
1819 slash = strchr(f->name + baselen, '/');
1820 if (slash) {
1821 int newbaselen = slash + 1 - f->name;
1822 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1823 sources++;
1824 } else {
1825 this = f->changed;
1826 dir->files++;
1827 dir->nr--;
1828 sources += 2;
1829 }
1830 this_dir += this;
1831 }
1832
1833 /*
1834 * We don't report dirstat's for
1835 * - the top level
1836 * - or cases where everything came from a single directory
1837 * under this directory (sources == 1).
1838 */
1839 if (baselen && sources != 1) {
1840 if (this_dir) {
1841 int permille = this_dir * 1000 / changed;
1842 if (permille >= dir->permille) {
1843 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1844 permille / 10, permille % 10, baselen, base);
1845 if (!dir->cumulative)
1846 return 0;
1847 }
1848 }
1849 }
1850 return this_dir;
1851 }
1852
1853 static int dirstat_compare(const void *_a, const void *_b)
1854 {
1855 const struct dirstat_file *a = _a;
1856 const struct dirstat_file *b = _b;
1857 return strcmp(a->name, b->name);
1858 }
1859
1860 static void show_dirstat(struct diff_options *options)
1861 {
1862 int i;
1863 unsigned long changed;
1864 struct dirstat_dir dir;
1865 struct diff_queue_struct *q = &diff_queued_diff;
1866
1867 dir.files = NULL;
1868 dir.alloc = 0;
1869 dir.nr = 0;
1870 dir.permille = options->dirstat_permille;
1871 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1872
1873 changed = 0;
1874 for (i = 0; i < q->nr; i++) {
1875 struct diff_filepair *p = q->queue[i];
1876 const char *name;
1877 unsigned long copied, added, damage;
1878 int content_changed;
1879
1880 name = p->two->path ? p->two->path : p->one->path;
1881
1882 if (p->one->sha1_valid && p->two->sha1_valid)
1883 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1884 else
1885 content_changed = 1;
1886
1887 if (!content_changed) {
1888 /*
1889 * The SHA1 has not changed, so pre-/post-content is
1890 * identical. We can therefore skip looking at the
1891 * file contents altogether.
1892 */
1893 damage = 0;
1894 goto found_damage;
1895 }
1896
1897 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1898 /*
1899 * In --dirstat-by-file mode, we don't really need to
1900 * look at the actual file contents at all.
1901 * The fact that the SHA1 changed is enough for us to
1902 * add this file to the list of results
1903 * (with each file contributing equal damage).
1904 */
1905 damage = 1;
1906 goto found_damage;
1907 }
1908
1909 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1910 diff_populate_filespec(p->one, 0);
1911 diff_populate_filespec(p->two, 0);
1912 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1913 &copied, &added);
1914 diff_free_filespec_data(p->one);
1915 diff_free_filespec_data(p->two);
1916 } else if (DIFF_FILE_VALID(p->one)) {
1917 diff_populate_filespec(p->one, 1);
1918 copied = added = 0;
1919 diff_free_filespec_data(p->one);
1920 } else if (DIFF_FILE_VALID(p->two)) {
1921 diff_populate_filespec(p->two, 1);
1922 copied = 0;
1923 added = p->two->size;
1924 diff_free_filespec_data(p->two);
1925 } else
1926 continue;
1927
1928 /*
1929 * Original minus copied is the removed material,
1930 * added is the new material. They are both damages
1931 * made to the preimage.
1932 * If the resulting damage is zero, we know that
1933 * diffcore_count_changes() considers the two entries to
1934 * be identical, but since content_changed is true, we
1935 * know that there must have been _some_ kind of change,
1936 * so we force all entries to have damage > 0.
1937 */
1938 damage = (p->one->size - copied) + added;
1939 if (!damage)
1940 damage = 1;
1941
1942 found_damage:
1943 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1944 dir.files[dir.nr].name = name;
1945 dir.files[dir.nr].changed = damage;
1946 changed += damage;
1947 dir.nr++;
1948 }
1949
1950 /* This can happen even with many files, if everything was renames */
1951 if (!changed)
1952 return;
1953
1954 /* Show all directories with more than x% of the changes */
1955 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1956 gather_dirstat(options, &dir, changed, "", 0);
1957 }
1958
1959 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1960 {
1961 int i;
1962 unsigned long changed;
1963 struct dirstat_dir dir;
1964
1965 if (data->nr == 0)
1966 return;
1967
1968 dir.files = NULL;
1969 dir.alloc = 0;
1970 dir.nr = 0;
1971 dir.permille = options->dirstat_permille;
1972 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1973
1974 changed = 0;
1975 for (i = 0; i < data->nr; i++) {
1976 struct diffstat_file *file = data->files[i];
1977 unsigned long damage = file->added + file->deleted;
1978 if (file->is_binary)
1979 /*
1980 * binary files counts bytes, not lines. Must find some
1981 * way to normalize binary bytes vs. textual lines.
1982 * The following heuristic assumes that there are 64
1983 * bytes per "line".
1984 * This is stupid and ugly, but very cheap...
1985 */
1986 damage = (damage + 63) / 64;
1987 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1988 dir.files[dir.nr].name = file->name;
1989 dir.files[dir.nr].changed = damage;
1990 changed += damage;
1991 dir.nr++;
1992 }
1993
1994 /* This can happen even with many files, if everything was renames */
1995 if (!changed)
1996 return;
1997
1998 /* Show all directories with more than x% of the changes */
1999 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2000 gather_dirstat(options, &dir, changed, "", 0);
2001 }
2002
2003 static void free_diffstat_info(struct diffstat_t *diffstat)
2004 {
2005 int i;
2006 for (i = 0; i < diffstat->nr; i++) {
2007 struct diffstat_file *f = diffstat->files[i];
2008 if (f->name != f->print_name)
2009 free(f->print_name);
2010 free(f->name);
2011 free(f->from_name);
2012 free(f);
2013 }
2014 free(diffstat->files);
2015 }
2016
2017 struct checkdiff_t {
2018 const char *filename;
2019 int lineno;
2020 int conflict_marker_size;
2021 struct diff_options *o;
2022 unsigned ws_rule;
2023 unsigned status;
2024 };
2025
2026 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2027 {
2028 char firstchar;
2029 int cnt;
2030
2031 if (len < marker_size + 1)
2032 return 0;
2033 firstchar = line[0];
2034 switch (firstchar) {
2035 case '=': case '>': case '<': case '|':
2036 break;
2037 default:
2038 return 0;
2039 }
2040 for (cnt = 1; cnt < marker_size; cnt++)
2041 if (line[cnt] != firstchar)
2042 return 0;
2043 /* line[1] thru line[marker_size-1] are same as firstchar */
2044 if (len < marker_size + 1 || !isspace(line[marker_size]))
2045 return 0;
2046 return 1;
2047 }
2048
2049 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2050 {
2051 struct checkdiff_t *data = priv;
2052 int marker_size = data->conflict_marker_size;
2053 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2054 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2055 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2056 char *err;
2057 const char *line_prefix;
2058
2059 assert(data->o);
2060 line_prefix = diff_line_prefix(data->o);
2061
2062 if (line[0] == '+') {
2063 unsigned bad;
2064 data->lineno++;
2065 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2066 data->status |= 1;
2067 fprintf(data->o->file,
2068 "%s%s:%d: leftover conflict marker\n",
2069 line_prefix, data->filename, data->lineno);
2070 }
2071 bad = ws_check(line + 1, len - 1, data->ws_rule);
2072 if (!bad)
2073 return;
2074 data->status |= bad;
2075 err = whitespace_error_string(bad);
2076 fprintf(data->o->file, "%s%s:%d: %s.\n",
2077 line_prefix, data->filename, data->lineno, err);
2078 free(err);
2079 emit_line(data->o, set, reset, line, 1);
2080 ws_check_emit(line + 1, len - 1, data->ws_rule,
2081 data->o->file, set, reset, ws);
2082 } else if (line[0] == ' ') {
2083 data->lineno++;
2084 } else if (line[0] == '@') {
2085 char *plus = strchr(line, '+');
2086 if (plus)
2087 data->lineno = strtol(plus, NULL, 10) - 1;
2088 else
2089 die("invalid diff");
2090 }
2091 }
2092
2093 static unsigned char *deflate_it(char *data,
2094 unsigned long size,
2095 unsigned long *result_size)
2096 {
2097 int bound;
2098 unsigned char *deflated;
2099 git_zstream stream;
2100
2101 memset(&stream, 0, sizeof(stream));
2102 git_deflate_init(&stream, zlib_compression_level);
2103 bound = git_deflate_bound(&stream, size);
2104 deflated = xmalloc(bound);
2105 stream.next_out = deflated;
2106 stream.avail_out = bound;
2107
2108 stream.next_in = (unsigned char *)data;
2109 stream.avail_in = size;
2110 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2111 ; /* nothing */
2112 git_deflate_end(&stream);
2113 *result_size = stream.total_out;
2114 return deflated;
2115 }
2116
2117 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2118 const char *prefix)
2119 {
2120 void *cp;
2121 void *delta;
2122 void *deflated;
2123 void *data;
2124 unsigned long orig_size;
2125 unsigned long delta_size;
2126 unsigned long deflate_size;
2127 unsigned long data_size;
2128
2129 /* We could do deflated delta, or we could do just deflated two,
2130 * whichever is smaller.
2131 */
2132 delta = NULL;
2133 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2134 if (one->size && two->size) {
2135 delta = diff_delta(one->ptr, one->size,
2136 two->ptr, two->size,
2137 &delta_size, deflate_size);
2138 if (delta) {
2139 void *to_free = delta;
2140 orig_size = delta_size;
2141 delta = deflate_it(delta, delta_size, &delta_size);
2142 free(to_free);
2143 }
2144 }
2145
2146 if (delta && delta_size < deflate_size) {
2147 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2148 free(deflated);
2149 data = delta;
2150 data_size = delta_size;
2151 }
2152 else {
2153 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2154 free(delta);
2155 data = deflated;
2156 data_size = deflate_size;
2157 }
2158
2159 /* emit data encoded in base85 */
2160 cp = data;
2161 while (data_size) {
2162 int bytes = (52 < data_size) ? 52 : data_size;
2163 char line[70];
2164 data_size -= bytes;
2165 if (bytes <= 26)
2166 line[0] = bytes + 'A' - 1;
2167 else
2168 line[0] = bytes - 26 + 'a' - 1;
2169 encode_85(line + 1, cp, bytes);
2170 cp = (char *) cp + bytes;
2171 fprintf(file, "%s", prefix);
2172 fputs(line, file);
2173 fputc('\n', file);
2174 }
2175 fprintf(file, "%s\n", prefix);
2176 free(data);
2177 }
2178
2179 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2180 const char *prefix)
2181 {
2182 fprintf(file, "%sGIT binary patch\n", prefix);
2183 emit_binary_diff_body(file, one, two, prefix);
2184 emit_binary_diff_body(file, two, one, prefix);
2185 }
2186
2187 int diff_filespec_is_binary(struct diff_filespec *one)
2188 {
2189 if (one->is_binary == -1) {
2190 diff_filespec_load_driver(one);
2191 if (one->driver->binary != -1)
2192 one->is_binary = one->driver->binary;
2193 else {
2194 if (!one->data && DIFF_FILE_VALID(one))
2195 diff_populate_filespec(one, 0);
2196 if (one->data)
2197 one->is_binary = buffer_is_binary(one->data,
2198 one->size);
2199 if (one->is_binary == -1)
2200 one->is_binary = 0;
2201 }
2202 }
2203 return one->is_binary;
2204 }
2205
2206 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2207 {
2208 diff_filespec_load_driver(one);
2209 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2210 }
2211
2212 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2213 {
2214 if (!options->a_prefix)
2215 options->a_prefix = a;
2216 if (!options->b_prefix)
2217 options->b_prefix = b;
2218 }
2219
2220 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2221 {
2222 if (!DIFF_FILE_VALID(one))
2223 return NULL;
2224
2225 diff_filespec_load_driver(one);
2226 return userdiff_get_textconv(one->driver);
2227 }
2228
2229 static void builtin_diff(const char *name_a,
2230 const char *name_b,
2231 struct diff_filespec *one,
2232 struct diff_filespec *two,
2233 const char *xfrm_msg,
2234 int must_show_header,
2235 struct diff_options *o,
2236 int complete_rewrite)
2237 {
2238 mmfile_t mf1, mf2;
2239 const char *lbl[2];
2240 char *a_one, *b_two;
2241 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2242 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2243 const char *a_prefix, *b_prefix;
2244 struct userdiff_driver *textconv_one = NULL;
2245 struct userdiff_driver *textconv_two = NULL;
2246 struct strbuf header = STRBUF_INIT;
2247 const char *line_prefix = diff_line_prefix(o);
2248
2249 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2250 (!one->mode || S_ISGITLINK(one->mode)) &&
2251 (!two->mode || S_ISGITLINK(two->mode))) {
2252 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2253 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2254 show_submodule_summary(o->file, one->path ? one->path : two->path,
2255 line_prefix,
2256 one->sha1, two->sha1, two->dirty_submodule,
2257 meta, del, add, reset);
2258 return;
2259 }
2260
2261 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2262 textconv_one = get_textconv(one);
2263 textconv_two = get_textconv(two);
2264 }
2265
2266 diff_set_mnemonic_prefix(o, "a/", "b/");
2267 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2268 a_prefix = o->b_prefix;
2269 b_prefix = o->a_prefix;
2270 } else {
2271 a_prefix = o->a_prefix;
2272 b_prefix = o->b_prefix;
2273 }
2274
2275 /* Never use a non-valid filename anywhere if at all possible */
2276 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2277 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2278
2279 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2280 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2281 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2282 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2283 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2284 if (lbl[0][0] == '/') {
2285 /* /dev/null */
2286 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2287 if (xfrm_msg)
2288 strbuf_addstr(&header, xfrm_msg);
2289 must_show_header = 1;
2290 }
2291 else if (lbl[1][0] == '/') {
2292 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2293 if (xfrm_msg)
2294 strbuf_addstr(&header, xfrm_msg);
2295 must_show_header = 1;
2296 }
2297 else {
2298 if (one->mode != two->mode) {
2299 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2300 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2301 must_show_header = 1;
2302 }
2303 if (xfrm_msg)
2304 strbuf_addstr(&header, xfrm_msg);
2305
2306 /*
2307 * we do not run diff between different kind
2308 * of objects.
2309 */
2310 if ((one->mode ^ two->mode) & S_IFMT)
2311 goto free_ab_and_return;
2312 if (complete_rewrite &&
2313 (textconv_one || !diff_filespec_is_binary(one)) &&
2314 (textconv_two || !diff_filespec_is_binary(two))) {
2315 fprintf(o->file, "%s", header.buf);
2316 strbuf_reset(&header);
2317 emit_rewrite_diff(name_a, name_b, one, two,
2318 textconv_one, textconv_two, o);
2319 o->found_changes = 1;
2320 goto free_ab_and_return;
2321 }
2322 }
2323
2324 if (o->irreversible_delete && lbl[1][0] == '/') {
2325 fprintf(o->file, "%s", header.buf);
2326 strbuf_reset(&header);
2327 goto free_ab_and_return;
2328 } else if (!DIFF_OPT_TST(o, TEXT) &&
2329 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2330 (!textconv_two && diff_filespec_is_binary(two)) )) {
2331 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2332 die("unable to read files to diff");
2333 /* Quite common confusing case */
2334 if (mf1.size == mf2.size &&
2335 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2336 if (must_show_header)
2337 fprintf(o->file, "%s", header.buf);
2338 goto free_ab_and_return;
2339 }
2340 fprintf(o->file, "%s", header.buf);
2341 strbuf_reset(&header);
2342 if (DIFF_OPT_TST(o, BINARY))
2343 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2344 else
2345 fprintf(o->file, "%sBinary files %s and %s differ\n",
2346 line_prefix, lbl[0], lbl[1]);
2347 o->found_changes = 1;
2348 } else {
2349 /* Crazy xdl interfaces.. */
2350 const char *diffopts = getenv("GIT_DIFF_OPTS");
2351 xpparam_t xpp;
2352 xdemitconf_t xecfg;
2353 struct emit_callback ecbdata;
2354 const struct userdiff_funcname *pe;
2355
2356 if (must_show_header) {
2357 fprintf(o->file, "%s", header.buf);
2358 strbuf_reset(&header);
2359 }
2360
2361 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2362 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2363
2364 pe = diff_funcname_pattern(one);
2365 if (!pe)
2366 pe = diff_funcname_pattern(two);
2367
2368 memset(&xpp, 0, sizeof(xpp));
2369 memset(&xecfg, 0, sizeof(xecfg));
2370 memset(&ecbdata, 0, sizeof(ecbdata));
2371 ecbdata.label_path = lbl;
2372 ecbdata.color_diff = want_color(o->use_color);
2373 ecbdata.found_changesp = &o->found_changes;
2374 ecbdata.ws_rule = whitespace_rule(name_b);
2375 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2376 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2377 ecbdata.opt = o;
2378 ecbdata.header = header.len ? &header : NULL;
2379 xpp.flags = o->xdl_opts;
2380 xecfg.ctxlen = o->context;
2381 xecfg.interhunkctxlen = o->interhunkcontext;
2382 xecfg.flags = XDL_EMIT_FUNCNAMES;
2383 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2384 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2385 if (pe)
2386 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2387 if (!diffopts)
2388 ;
2389 else if (starts_with(diffopts, "--unified="))
2390 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2391 else if (starts_with(diffopts, "-u"))
2392 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2393 if (o->word_diff)
2394 init_diff_words_data(&ecbdata, o, one, two);
2395 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2396 &xpp, &xecfg);
2397 if (o->word_diff)
2398 free_diff_words_data(&ecbdata);
2399 if (textconv_one)
2400 free(mf1.ptr);
2401 if (textconv_two)
2402 free(mf2.ptr);
2403 xdiff_clear_find_func(&xecfg);
2404 }
2405
2406 free_ab_and_return:
2407 strbuf_release(&header);
2408 diff_free_filespec_data(one);
2409 diff_free_filespec_data(two);
2410 free(a_one);
2411 free(b_two);
2412 return;
2413 }
2414
2415 static void builtin_diffstat(const char *name_a, const char *name_b,
2416 struct diff_filespec *one,
2417 struct diff_filespec *two,
2418 struct diffstat_t *diffstat,
2419 struct diff_options *o,
2420 struct diff_filepair *p)
2421 {
2422 mmfile_t mf1, mf2;
2423 struct diffstat_file *data;
2424 int same_contents;
2425 int complete_rewrite = 0;
2426
2427 if (!DIFF_PAIR_UNMERGED(p)) {
2428 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2429 complete_rewrite = 1;
2430 }
2431
2432 data = diffstat_add(diffstat, name_a, name_b);
2433 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2434
2435 if (!one || !two) {
2436 data->is_unmerged = 1;
2437 return;
2438 }
2439
2440 same_contents = !hashcmp(one->sha1, two->sha1);
2441
2442 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2443 data->is_binary = 1;
2444 if (same_contents) {
2445 data->added = 0;
2446 data->deleted = 0;
2447 } else {
2448 data->added = diff_filespec_size(two);
2449 data->deleted = diff_filespec_size(one);
2450 }
2451 }
2452
2453 else if (complete_rewrite) {
2454 diff_populate_filespec(one, 0);
2455 diff_populate_filespec(two, 0);
2456 data->deleted = count_lines(one->data, one->size);
2457 data->added = count_lines(two->data, two->size);
2458 }
2459
2460 else if (!same_contents) {
2461 /* Crazy xdl interfaces.. */
2462 xpparam_t xpp;
2463 xdemitconf_t xecfg;
2464
2465 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2466 die("unable to read files to diff");
2467
2468 memset(&xpp, 0, sizeof(xpp));
2469 memset(&xecfg, 0, sizeof(xecfg));
2470 xpp.flags = o->xdl_opts;
2471 xecfg.ctxlen = o->context;
2472 xecfg.interhunkctxlen = o->interhunkcontext;
2473 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2474 &xpp, &xecfg);
2475 }
2476
2477 diff_free_filespec_data(one);
2478 diff_free_filespec_data(two);
2479 }
2480
2481 static void builtin_checkdiff(const char *name_a, const char *name_b,
2482 const char *attr_path,
2483 struct diff_filespec *one,
2484 struct diff_filespec *two,
2485 struct diff_options *o)
2486 {
2487 mmfile_t mf1, mf2;
2488 struct checkdiff_t data;
2489
2490 if (!two)
2491 return;
2492
2493 memset(&data, 0, sizeof(data));
2494 data.filename = name_b ? name_b : name_a;
2495 data.lineno = 0;
2496 data.o = o;
2497 data.ws_rule = whitespace_rule(attr_path);
2498 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2499
2500 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2501 die("unable to read files to diff");
2502
2503 /*
2504 * All the other codepaths check both sides, but not checking
2505 * the "old" side here is deliberate. We are checking the newly
2506 * introduced changes, and as long as the "new" side is text, we
2507 * can and should check what it introduces.
2508 */
2509 if (diff_filespec_is_binary(two))
2510 goto free_and_return;
2511 else {
2512 /* Crazy xdl interfaces.. */
2513 xpparam_t xpp;
2514 xdemitconf_t xecfg;
2515
2516 memset(&xpp, 0, sizeof(xpp));
2517 memset(&xecfg, 0, sizeof(xecfg));
2518 xecfg.ctxlen = 1; /* at least one context line */
2519 xpp.flags = 0;
2520 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2521 &xpp, &xecfg);
2522
2523 if (data.ws_rule & WS_BLANK_AT_EOF) {
2524 struct emit_callback ecbdata;
2525 int blank_at_eof;
2526
2527 ecbdata.ws_rule = data.ws_rule;
2528 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2529 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2530
2531 if (blank_at_eof) {
2532 static char *err;
2533 if (!err)
2534 err = whitespace_error_string(WS_BLANK_AT_EOF);
2535 fprintf(o->file, "%s:%d: %s.\n",
2536 data.filename, blank_at_eof, err);
2537 data.status = 1; /* report errors */
2538 }
2539 }
2540 }
2541 free_and_return:
2542 diff_free_filespec_data(one);
2543 diff_free_filespec_data(two);
2544 if (data.status)
2545 DIFF_OPT_SET(o, CHECK_FAILED);
2546 }
2547
2548 struct diff_filespec *alloc_filespec(const char *path)
2549 {
2550 int namelen = strlen(path);
2551 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2552
2553 memset(spec, 0, sizeof(*spec));
2554 spec->path = (char *)(spec + 1);
2555 memcpy(spec->path, path, namelen+1);
2556 spec->count = 1;
2557 spec->is_binary = -1;
2558 return spec;
2559 }
2560
2561 void free_filespec(struct diff_filespec *spec)
2562 {
2563 if (!--spec->count) {
2564 diff_free_filespec_data(spec);
2565 free(spec);
2566 }
2567 }
2568
2569 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2570 int sha1_valid, unsigned short mode)
2571 {
2572 if (mode) {
2573 spec->mode = canon_mode(mode);
2574 hashcpy(spec->sha1, sha1);
2575 spec->sha1_valid = sha1_valid;
2576 }
2577 }
2578
2579 /*
2580 * Given a name and sha1 pair, if the index tells us the file in
2581 * the work tree has that object contents, return true, so that
2582 * prepare_temp_file() does not have to inflate and extract.
2583 */
2584 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2585 {
2586 const struct cache_entry *ce;
2587 struct stat st;
2588 int pos, len;
2589
2590 /*
2591 * We do not read the cache ourselves here, because the
2592 * benchmark with my previous version that always reads cache
2593 * shows that it makes things worse for diff-tree comparing
2594 * two linux-2.6 kernel trees in an already checked out work
2595 * tree. This is because most diff-tree comparisons deal with
2596 * only a small number of files, while reading the cache is
2597 * expensive for a large project, and its cost outweighs the
2598 * savings we get by not inflating the object to a temporary
2599 * file. Practically, this code only helps when we are used
2600 * by diff-cache --cached, which does read the cache before
2601 * calling us.
2602 */
2603 if (!active_cache)
2604 return 0;
2605
2606 /* We want to avoid the working directory if our caller
2607 * doesn't need the data in a normal file, this system
2608 * is rather slow with its stat/open/mmap/close syscalls,
2609 * and the object is contained in a pack file. The pack
2610 * is probably already open and will be faster to obtain
2611 * the data through than the working directory. Loose
2612 * objects however would tend to be slower as they need
2613 * to be individually opened and inflated.
2614 */
2615 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2616 return 0;
2617
2618 len = strlen(name);
2619 pos = cache_name_pos(name, len);
2620 if (pos < 0)
2621 return 0;
2622 ce = active_cache[pos];
2623
2624 /*
2625 * This is not the sha1 we are looking for, or
2626 * unreusable because it is not a regular file.
2627 */
2628 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2629 return 0;
2630
2631 /*
2632 * If ce is marked as "assume unchanged", there is no
2633 * guarantee that work tree matches what we are looking for.
2634 */
2635 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2636 return 0;
2637
2638 /*
2639 * If ce matches the file in the work tree, we can reuse it.
2640 */
2641 if (ce_uptodate(ce) ||
2642 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2643 return 1;
2644
2645 return 0;
2646 }
2647
2648 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2649 {
2650 int len;
2651 char *data = xmalloc(100), *dirty = "";
2652
2653 /* Are we looking at the work tree? */
2654 if (s->dirty_submodule)
2655 dirty = "-dirty";
2656
2657 len = snprintf(data, 100,
2658 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2659 s->data = data;
2660 s->size = len;
2661 s->should_free = 1;
2662 if (size_only) {
2663 s->data = NULL;
2664 free(data);
2665 }
2666 return 0;
2667 }
2668
2669 /*
2670 * While doing rename detection and pickaxe operation, we may need to
2671 * grab the data for the blob (or file) for our own in-core comparison.
2672 * diff_filespec has data and size fields for this purpose.
2673 */
2674 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2675 {
2676 int err = 0;
2677 /*
2678 * demote FAIL to WARN to allow inspecting the situation
2679 * instead of refusing.
2680 */
2681 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2682 ? SAFE_CRLF_WARN
2683 : safe_crlf);
2684
2685 if (!DIFF_FILE_VALID(s))
2686 die("internal error: asking to populate invalid file.");
2687 if (S_ISDIR(s->mode))
2688 return -1;
2689
2690 if (s->data)
2691 return 0;
2692
2693 if (size_only && 0 < s->size)
2694 return 0;
2695
2696 if (S_ISGITLINK(s->mode))
2697 return diff_populate_gitlink(s, size_only);
2698
2699 if (!s->sha1_valid ||
2700 reuse_worktree_file(s->path, s->sha1, 0)) {
2701 struct strbuf buf = STRBUF_INIT;
2702 struct stat st;
2703 int fd;
2704
2705 if (lstat(s->path, &st) < 0) {
2706 if (errno == ENOENT) {
2707 err_empty:
2708 err = -1;
2709 empty:
2710 s->data = (char *)"";
2711 s->size = 0;
2712 return err;
2713 }
2714 }
2715 s->size = xsize_t(st.st_size);
2716 if (!s->size)
2717 goto empty;
2718 if (S_ISLNK(st.st_mode)) {
2719 struct strbuf sb = STRBUF_INIT;
2720
2721 if (strbuf_readlink(&sb, s->path, s->size))
2722 goto err_empty;
2723 s->size = sb.len;
2724 s->data = strbuf_detach(&sb, NULL);
2725 s->should_free = 1;
2726 return 0;
2727 }
2728 if (size_only)
2729 return 0;
2730 fd = open(s->path, O_RDONLY);
2731 if (fd < 0)
2732 goto err_empty;
2733 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2734 close(fd);
2735 s->should_munmap = 1;
2736
2737 /*
2738 * Convert from working tree format to canonical git format
2739 */
2740 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2741 size_t size = 0;
2742 munmap(s->data, s->size);
2743 s->should_munmap = 0;
2744 s->data = strbuf_detach(&buf, &size);
2745 s->size = size;
2746 s->should_free = 1;
2747 }
2748 }
2749 else {
2750 enum object_type type;
2751 if (size_only) {
2752 type = sha1_object_info(s->sha1, &s->size);
2753 if (type < 0)
2754 die("unable to read %s", sha1_to_hex(s->sha1));
2755 } else {
2756 s->data = read_sha1_file(s->sha1, &type, &s->size);
2757 if (!s->data)
2758 die("unable to read %s", sha1_to_hex(s->sha1));
2759 s->should_free = 1;
2760 }
2761 }
2762 return 0;
2763 }
2764
2765 void diff_free_filespec_blob(struct diff_filespec *s)
2766 {
2767 if (s->should_free)
2768 free(s->data);
2769 else if (s->should_munmap)
2770 munmap(s->data, s->size);
2771
2772 if (s->should_free || s->should_munmap) {
2773 s->should_free = s->should_munmap = 0;
2774 s->data = NULL;
2775 }
2776 }
2777
2778 void diff_free_filespec_data(struct diff_filespec *s)
2779 {
2780 diff_free_filespec_blob(s);
2781 free(s->cnt_data);
2782 s->cnt_data = NULL;
2783 }
2784
2785 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2786 void *blob,
2787 unsigned long size,
2788 const unsigned char *sha1,
2789 int mode)
2790 {
2791 int fd;
2792 struct strbuf buf = STRBUF_INIT;
2793 struct strbuf template = STRBUF_INIT;
2794 char *path_dup = xstrdup(path);
2795 const char *base = basename(path_dup);
2796
2797 /* Generate "XXXXXX_basename.ext" */
2798 strbuf_addstr(&template, "XXXXXX_");
2799 strbuf_addstr(&template, base);
2800
2801 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2802 strlen(base) + 1);
2803 if (fd < 0)
2804 die_errno("unable to create temp-file");
2805 if (convert_to_working_tree(path,
2806 (const char *)blob, (size_t)size, &buf)) {
2807 blob = buf.buf;
2808 size = buf.len;
2809 }
2810 if (write_in_full(fd, blob, size) != size)
2811 die_errno("unable to write temp-file");
2812 close(fd);
2813 temp->name = temp->tmp_path;
2814 strcpy(temp->hex, sha1_to_hex(sha1));
2815 temp->hex[40] = 0;
2816 sprintf(temp->mode, "%06o", mode);
2817 strbuf_release(&buf);
2818 strbuf_release(&template);
2819 free(path_dup);
2820 }
2821
2822 static struct diff_tempfile *prepare_temp_file(const char *name,
2823 struct diff_filespec *one)
2824 {
2825 struct diff_tempfile *temp = claim_diff_tempfile();
2826
2827 if (!DIFF_FILE_VALID(one)) {
2828 not_a_valid_file:
2829 /* A '-' entry produces this for file-2, and
2830 * a '+' entry produces this for file-1.
2831 */
2832 temp->name = "/dev/null";
2833 strcpy(temp->hex, ".");
2834 strcpy(temp->mode, ".");
2835 return temp;
2836 }
2837
2838 if (!remove_tempfile_installed) {
2839 atexit(remove_tempfile);
2840 sigchain_push_common(remove_tempfile_on_signal);
2841 remove_tempfile_installed = 1;
2842 }
2843
2844 if (!one->sha1_valid ||
2845 reuse_worktree_file(name, one->sha1, 1)) {
2846 struct stat st;
2847 if (lstat(name, &st) < 0) {
2848 if (errno == ENOENT)
2849 goto not_a_valid_file;
2850 die_errno("stat(%s)", name);
2851 }
2852 if (S_ISLNK(st.st_mode)) {
2853 struct strbuf sb = STRBUF_INIT;
2854 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2855 die_errno("readlink(%s)", name);
2856 prep_temp_blob(name, temp, sb.buf, sb.len,
2857 (one->sha1_valid ?
2858 one->sha1 : null_sha1),
2859 (one->sha1_valid ?
2860 one->mode : S_IFLNK));
2861 strbuf_release(&sb);
2862 }
2863 else {
2864 /* we can borrow from the file in the work tree */
2865 temp->name = name;
2866 if (!one->sha1_valid)
2867 strcpy(temp->hex, sha1_to_hex(null_sha1));
2868 else
2869 strcpy(temp->hex, sha1_to_hex(one->sha1));
2870 /* Even though we may sometimes borrow the
2871 * contents from the work tree, we always want
2872 * one->mode. mode is trustworthy even when
2873 * !(one->sha1_valid), as long as
2874 * DIFF_FILE_VALID(one).
2875 */
2876 sprintf(temp->mode, "%06o", one->mode);
2877 }
2878 return temp;
2879 }
2880 else {
2881 if (diff_populate_filespec(one, 0))
2882 die("cannot read data blob for %s", one->path);
2883 prep_temp_blob(name, temp, one->data, one->size,
2884 one->sha1, one->mode);
2885 }
2886 return temp;
2887 }
2888
2889 /* An external diff command takes:
2890 *
2891 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2892 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2893 *
2894 */
2895 static void run_external_diff(const char *pgm,
2896 const char *name,
2897 const char *other,
2898 struct diff_filespec *one,
2899 struct diff_filespec *two,
2900 const char *xfrm_msg,
2901 int complete_rewrite,
2902 struct diff_options *o)
2903 {
2904 const char *spawn_arg[10];
2905 int retval;
2906 const char **arg = &spawn_arg[0];
2907 struct diff_queue_struct *q = &diff_queued_diff;
2908 const char *env[3] = { NULL };
2909 char env_counter[50];
2910 char env_total[50];
2911
2912 if (one && two) {
2913 struct diff_tempfile *temp_one, *temp_two;
2914 const char *othername = (other ? other : name);
2915 temp_one = prepare_temp_file(name, one);
2916 temp_two = prepare_temp_file(othername, two);
2917 *arg++ = pgm;
2918 *arg++ = name;
2919 *arg++ = temp_one->name;
2920 *arg++ = temp_one->hex;
2921 *arg++ = temp_one->mode;
2922 *arg++ = temp_two->name;
2923 *arg++ = temp_two->hex;
2924 *arg++ = temp_two->mode;
2925 if (other) {
2926 *arg++ = other;
2927 *arg++ = xfrm_msg;
2928 }
2929 } else {
2930 *arg++ = pgm;
2931 *arg++ = name;
2932 }
2933 *arg = NULL;
2934 fflush(NULL);
2935
2936 env[0] = env_counter;
2937 snprintf(env_counter, sizeof(env_counter), "GIT_DIFF_PATH_COUNTER=%d",
2938 ++o->diff_path_counter);
2939 env[1] = env_total;
2940 snprintf(env_total, sizeof(env_total), "GIT_DIFF_PATH_TOTAL=%d", q->nr);
2941
2942 retval = run_command_v_opt_cd_env(spawn_arg, RUN_USING_SHELL, NULL, env);
2943 remove_tempfile();
2944 if (retval) {
2945 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2946 exit(1);
2947 }
2948 }
2949
2950 static int similarity_index(struct diff_filepair *p)
2951 {
2952 return p->score * 100 / MAX_SCORE;
2953 }
2954
2955 static void fill_metainfo(struct strbuf *msg,
2956 const char *name,
2957 const char *other,
2958 struct diff_filespec *one,
2959 struct diff_filespec *two,
2960 struct diff_options *o,
2961 struct diff_filepair *p,
2962 int *must_show_header,
2963 int use_color)
2964 {
2965 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2966 const char *reset = diff_get_color(use_color, DIFF_RESET);
2967 const char *line_prefix = diff_line_prefix(o);
2968
2969 *must_show_header = 1;
2970 strbuf_init(msg, PATH_MAX * 2 + 300);
2971 switch (p->status) {
2972 case DIFF_STATUS_COPIED:
2973 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2974 line_prefix, set, similarity_index(p));
2975 strbuf_addf(msg, "%s\n%s%scopy from ",
2976 reset, line_prefix, set);
2977 quote_c_style(name, msg, NULL, 0);
2978 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2979 quote_c_style(other, msg, NULL, 0);
2980 strbuf_addf(msg, "%s\n", reset);
2981 break;
2982 case DIFF_STATUS_RENAMED:
2983 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2984 line_prefix, set, similarity_index(p));
2985 strbuf_addf(msg, "%s\n%s%srename from ",
2986 reset, line_prefix, set);
2987 quote_c_style(name, msg, NULL, 0);
2988 strbuf_addf(msg, "%s\n%s%srename to ",
2989 reset, line_prefix, set);
2990 quote_c_style(other, msg, NULL, 0);
2991 strbuf_addf(msg, "%s\n", reset);
2992 break;
2993 case DIFF_STATUS_MODIFIED:
2994 if (p->score) {
2995 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2996 line_prefix,
2997 set, similarity_index(p), reset);
2998 break;
2999 }
3000 /* fallthru */
3001 default:
3002 *must_show_header = 0;
3003 }
3004 if (one && two && hashcmp(one->sha1, two->sha1)) {
3005 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3006
3007 if (DIFF_OPT_TST(o, BINARY)) {
3008 mmfile_t mf;
3009 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3010 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3011 abbrev = 40;
3012 }
3013 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3014 find_unique_abbrev(one->sha1, abbrev));
3015 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3016 if (one->mode == two->mode)
3017 strbuf_addf(msg, " %06o", one->mode);
3018 strbuf_addf(msg, "%s\n", reset);
3019 }
3020 }
3021
3022 static void run_diff_cmd(const char *pgm,
3023 const char *name,
3024 const char *other,
3025 const char *attr_path,
3026 struct diff_filespec *one,
3027 struct diff_filespec *two,
3028 struct strbuf *msg,
3029 struct diff_options *o,
3030 struct diff_filepair *p)
3031 {
3032 const char *xfrm_msg = NULL;
3033 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3034 int must_show_header = 0;
3035
3036
3037 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3038 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3039 if (drv && drv->external)
3040 pgm = drv->external;
3041 }
3042
3043 if (msg) {
3044 /*
3045 * don't use colors when the header is intended for an
3046 * external diff driver
3047 */
3048 fill_metainfo(msg, name, other, one, two, o, p,
3049 &must_show_header,
3050 want_color(o->use_color) && !pgm);
3051 xfrm_msg = msg->len ? msg->buf : NULL;
3052 }
3053
3054 if (pgm) {
3055 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3056 complete_rewrite, o);
3057 return;
3058 }
3059 if (one && two)
3060 builtin_diff(name, other ? other : name,
3061 one, two, xfrm_msg, must_show_header,
3062 o, complete_rewrite);
3063 else
3064 fprintf(o->file, "* Unmerged path %s\n", name);
3065 }
3066
3067 static void diff_fill_sha1_info(struct diff_filespec *one)
3068 {
3069 if (DIFF_FILE_VALID(one)) {
3070 if (!one->sha1_valid) {
3071 struct stat st;
3072 if (one->is_stdin) {
3073 hashcpy(one->sha1, null_sha1);
3074 return;
3075 }
3076 if (lstat(one->path, &st) < 0)
3077 die_errno("stat '%s'", one->path);
3078 if (index_path(one->sha1, one->path, &st, 0))
3079 die("cannot hash %s", one->path);
3080 }
3081 }
3082 else
3083 hashclr(one->sha1);
3084 }
3085
3086 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3087 {
3088 /* Strip the prefix but do not molest /dev/null and absolute paths */
3089 if (*namep && **namep != '/') {
3090 *namep += prefix_length;
3091 if (**namep == '/')
3092 ++*namep;
3093 }
3094 if (*otherp && **otherp != '/') {
3095 *otherp += prefix_length;
3096 if (**otherp == '/')
3097 ++*otherp;
3098 }
3099 }
3100
3101 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3102 {
3103 const char *pgm = external_diff();
3104 struct strbuf msg;
3105 struct diff_filespec *one = p->one;
3106 struct diff_filespec *two = p->two;
3107 const char *name;
3108 const char *other;
3109 const char *attr_path;
3110
3111 name = p->one->path;
3112 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3113 attr_path = name;
3114 if (o->prefix_length)
3115 strip_prefix(o->prefix_length, &name, &other);
3116
3117 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3118 pgm = NULL;
3119
3120 if (DIFF_PAIR_UNMERGED(p)) {
3121 run_diff_cmd(pgm, name, NULL, attr_path,
3122 NULL, NULL, NULL, o, p);
3123 return;
3124 }
3125
3126 diff_fill_sha1_info(one);
3127 diff_fill_sha1_info(two);
3128
3129 if (!pgm &&
3130 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3131 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3132 /*
3133 * a filepair that changes between file and symlink
3134 * needs to be split into deletion and creation.
3135 */
3136 struct diff_filespec *null = alloc_filespec(two->path);
3137 run_diff_cmd(NULL, name, other, attr_path,
3138 one, null, &msg, o, p);
3139 free(null);
3140 strbuf_release(&msg);
3141
3142 null = alloc_filespec(one->path);
3143 run_diff_cmd(NULL, name, other, attr_path,
3144 null, two, &msg, o, p);
3145 free(null);
3146 }
3147 else
3148 run_diff_cmd(pgm, name, other, attr_path,
3149 one, two, &msg, o, p);
3150
3151 strbuf_release(&msg);
3152 }
3153
3154 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3155 struct diffstat_t *diffstat)
3156 {
3157 const char *name;
3158 const char *other;
3159
3160 if (DIFF_PAIR_UNMERGED(p)) {
3161 /* unmerged */
3162 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3163 return;
3164 }
3165
3166 name = p->one->path;
3167 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3168
3169 if (o->prefix_length)
3170 strip_prefix(o->prefix_length, &name, &other);
3171
3172 diff_fill_sha1_info(p->one);
3173 diff_fill_sha1_info(p->two);
3174
3175 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3176 }
3177
3178 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3179 {
3180 const char *name;
3181 const char *other;
3182 const char *attr_path;
3183
3184 if (DIFF_PAIR_UNMERGED(p)) {
3185 /* unmerged */
3186 return;
3187 }
3188
3189 name = p->one->path;
3190 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3191 attr_path = other ? other : name;
3192
3193 if (o->prefix_length)
3194 strip_prefix(o->prefix_length, &name, &other);
3195
3196 diff_fill_sha1_info(p->one);
3197 diff_fill_sha1_info(p->two);
3198
3199 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3200 }
3201
3202 void diff_setup(struct diff_options *options)
3203 {
3204 memcpy(options, &default_diff_options, sizeof(*options));
3205
3206 options->file = stdout;
3207
3208 options->line_termination = '\n';
3209 options->break_opt = -1;
3210 options->rename_limit = -1;
3211 options->dirstat_permille = diff_dirstat_permille_default;
3212 options->context = diff_context_default;
3213 DIFF_OPT_SET(options, RENAME_EMPTY);
3214
3215 options->change = diff_change;
3216 options->add_remove = diff_addremove;
3217 options->use_color = diff_use_color_default;
3218 options->detect_rename = diff_detect_rename_default;
3219 options->xdl_opts |= diff_algorithm;
3220
3221 options->orderfile = diff_order_file_cfg;
3222
3223 if (diff_no_prefix) {
3224 options->a_prefix = options->b_prefix = "";
3225 } else if (!diff_mnemonic_prefix) {
3226 options->a_prefix = "a/";
3227 options->b_prefix = "b/";
3228 }
3229 }
3230
3231 void diff_setup_done(struct diff_options *options)
3232 {
3233 int count = 0;
3234
3235 if (options->set_default)
3236 options->set_default(options);
3237
3238 if (options->output_format & DIFF_FORMAT_NAME)
3239 count++;
3240 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3241 count++;
3242 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3243 count++;
3244 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3245 count++;
3246 if (count > 1)
3247 die("--name-only, --name-status, --check and -s are mutually exclusive");
3248
3249 /*
3250 * Most of the time we can say "there are changes"
3251 * only by checking if there are changed paths, but
3252 * --ignore-whitespace* options force us to look
3253 * inside contents.
3254 */
3255
3256 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3257 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3258 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3259 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3260 else
3261 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3262
3263 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3264 options->detect_rename = DIFF_DETECT_COPY;
3265
3266 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3267 options->prefix = NULL;
3268 if (options->prefix)
3269 options->prefix_length = strlen(options->prefix);
3270 else
3271 options->prefix_length = 0;
3272
3273 if (options->output_format & (DIFF_FORMAT_NAME |
3274 DIFF_FORMAT_NAME_STATUS |
3275 DIFF_FORMAT_CHECKDIFF |
3276 DIFF_FORMAT_NO_OUTPUT))
3277 options->output_format &= ~(DIFF_FORMAT_RAW |
3278 DIFF_FORMAT_NUMSTAT |
3279 DIFF_FORMAT_DIFFSTAT |
3280 DIFF_FORMAT_SHORTSTAT |
3281 DIFF_FORMAT_DIRSTAT |
3282 DIFF_FORMAT_SUMMARY |
3283 DIFF_FORMAT_PATCH);
3284
3285 /*
3286 * These cases always need recursive; we do not drop caller-supplied
3287 * recursive bits for other formats here.
3288 */
3289 if (options->output_format & (DIFF_FORMAT_PATCH |
3290 DIFF_FORMAT_NUMSTAT |
3291 DIFF_FORMAT_DIFFSTAT |
3292 DIFF_FORMAT_SHORTSTAT |
3293 DIFF_FORMAT_DIRSTAT |
3294 DIFF_FORMAT_SUMMARY |
3295 DIFF_FORMAT_CHECKDIFF))
3296 DIFF_OPT_SET(options, RECURSIVE);
3297 /*
3298 * Also pickaxe would not work very well if you do not say recursive
3299 */
3300 if (options->pickaxe)
3301 DIFF_OPT_SET(options, RECURSIVE);
3302 /*
3303 * When patches are generated, submodules diffed against the work tree
3304 * must be checked for dirtiness too so it can be shown in the output
3305 */
3306 if (options->output_format & DIFF_FORMAT_PATCH)
3307 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3308
3309 if (options->detect_rename && options->rename_limit < 0)
3310 options->rename_limit = diff_rename_limit_default;
3311 if (options->setup & DIFF_SETUP_USE_CACHE) {
3312 if (!active_cache)
3313 /* read-cache does not die even when it fails
3314 * so it is safe for us to do this here. Also
3315 * it does not smudge active_cache or active_nr
3316 * when it fails, so we do not have to worry about
3317 * cleaning it up ourselves either.
3318 */
3319 read_cache();
3320 }
3321 if (options->abbrev <= 0 || 40 < options->abbrev)
3322 options->abbrev = 40; /* full */
3323
3324 /*
3325 * It does not make sense to show the first hit we happened
3326 * to have found. It does not make sense not to return with
3327 * exit code in such a case either.
3328 */
3329 if (DIFF_OPT_TST(options, QUICK)) {
3330 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3331 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3332 }
3333
3334 options->diff_path_counter = 0;
3335 }
3336
3337 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3338 {
3339 char c, *eq;
3340 int len;
3341
3342 if (*arg != '-')
3343 return 0;
3344 c = *++arg;
3345 if (!c)
3346 return 0;
3347 if (c == arg_short) {
3348 c = *++arg;
3349 if (!c)
3350 return 1;
3351 if (val && isdigit(c)) {
3352 char *end;
3353 int n = strtoul(arg, &end, 10);
3354 if (*end)
3355 return 0;
3356 *val = n;
3357 return 1;
3358 }
3359 return 0;
3360 }
3361 if (c != '-')
3362 return 0;
3363 arg++;
3364 eq = strchr(arg, '=');
3365 if (eq)
3366 len = eq - arg;
3367 else
3368 len = strlen(arg);
3369 if (!len || strncmp(arg, arg_long, len))
3370 return 0;
3371 if (eq) {
3372 int n;
3373 char *end;
3374 if (!isdigit(*++eq))
3375 return 0;
3376 n = strtoul(eq, &end, 10);
3377 if (*end)
3378 return 0;
3379 *val = n;
3380 }
3381 return 1;
3382 }
3383
3384 static int diff_scoreopt_parse(const char *opt);
3385
3386 static inline int short_opt(char opt, const char **argv,
3387 const char **optarg)
3388 {
3389 const char *arg = argv[0];
3390 if (arg[0] != '-' || arg[1] != opt)
3391 return 0;
3392 if (arg[2] != '\0') {
3393 *optarg = arg + 2;
3394 return 1;
3395 }
3396 if (!argv[1])
3397 die("Option '%c' requires a value", opt);
3398 *optarg = argv[1];
3399 return 2;
3400 }
3401
3402 int parse_long_opt(const char *opt, const char **argv,
3403 const char **optarg)
3404 {
3405 const char *arg = argv[0];
3406 if (arg[0] != '-' || arg[1] != '-')
3407 return 0;
3408 arg += strlen("--");
3409 if (!starts_with(arg, opt))
3410 return 0;
3411 arg += strlen(opt);
3412 if (*arg == '=') { /* stuck form: --option=value */
3413 *optarg = arg + 1;
3414 return 1;
3415 }
3416 if (*arg != '\0')
3417 return 0;
3418 /* separate form: --option value */
3419 if (!argv[1])
3420 die("Option '--%s' requires a value", opt);
3421 *optarg = argv[1];
3422 return 2;
3423 }
3424
3425 static int stat_opt(struct diff_options *options, const char **av)
3426 {
3427 const char *arg = av[0];
3428 char *end;
3429 int width = options->stat_width;
3430 int name_width = options->stat_name_width;
3431 int graph_width = options->stat_graph_width;
3432 int count = options->stat_count;
3433 int argcount = 1;
3434
3435 arg += strlen("--stat");
3436 end = (char *)arg;
3437
3438 switch (*arg) {
3439 case '-':
3440 if (starts_with(arg, "-width")) {
3441 arg += strlen("-width");
3442 if (*arg == '=')
3443 width = strtoul(arg + 1, &end, 10);
3444 else if (!*arg && !av[1])
3445 die("Option '--stat-width' requires a value");
3446 else if (!*arg) {
3447 width = strtoul(av[1], &end, 10);
3448 argcount = 2;
3449 }
3450 } else if (starts_with(arg, "-name-width")) {
3451 arg += strlen("-name-width");
3452 if (*arg == '=')
3453 name_width = strtoul(arg + 1, &end, 10);
3454 else if (!*arg && !av[1])
3455 die("Option '--stat-name-width' requires a value");
3456 else if (!*arg) {
3457 name_width = strtoul(av[1], &end, 10);
3458 argcount = 2;
3459 }
3460 } else if (starts_with(arg, "-graph-width")) {
3461 arg += strlen("-graph-width");
3462 if (*arg == '=')
3463 graph_width = strtoul(arg + 1, &end, 10);
3464 else if (!*arg && !av[1])
3465 die("Option '--stat-graph-width' requires a value");
3466 else if (!*arg) {
3467 graph_width = strtoul(av[1], &end, 10);
3468 argcount = 2;
3469 }
3470 } else if (starts_with(arg, "-count")) {
3471 arg += strlen("-count");
3472 if (*arg == '=')
3473 count = strtoul(arg + 1, &end, 10);
3474 else if (!*arg && !av[1])
3475 die("Option '--stat-count' requires a value");
3476 else if (!*arg) {
3477 count = strtoul(av[1], &end, 10);
3478 argcount = 2;
3479 }
3480 }
3481 break;
3482 case '=':
3483 width = strtoul(arg+1, &end, 10);
3484 if (*end == ',')
3485 name_width = strtoul(end+1, &end, 10);
3486 if (*end == ',')
3487 count = strtoul(end+1, &end, 10);
3488 }
3489
3490 /* Important! This checks all the error cases! */
3491 if (*end)
3492 return 0;
3493 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3494 options->stat_name_width = name_width;
3495 options->stat_graph_width = graph_width;
3496 options->stat_width = width;
3497 options->stat_count = count;
3498 return argcount;
3499 }
3500
3501 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3502 {
3503 struct strbuf errmsg = STRBUF_INIT;
3504 if (parse_dirstat_params(options, params, &errmsg))
3505 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3506 errmsg.buf);
3507 strbuf_release(&errmsg);
3508 /*
3509 * The caller knows a dirstat-related option is given from the command
3510 * line; allow it to say "return this_function();"
3511 */
3512 options->output_format |= DIFF_FORMAT_DIRSTAT;
3513 return 1;
3514 }
3515
3516 static int parse_submodule_opt(struct diff_options *options, const char *value)
3517 {
3518 if (parse_submodule_params(options, value))
3519 die(_("Failed to parse --submodule option parameter: '%s'"),
3520 value);
3521 return 1;
3522 }
3523
3524 static const char diff_status_letters[] = {
3525 DIFF_STATUS_ADDED,
3526 DIFF_STATUS_COPIED,
3527 DIFF_STATUS_DELETED,
3528 DIFF_STATUS_MODIFIED,
3529 DIFF_STATUS_RENAMED,
3530 DIFF_STATUS_TYPE_CHANGED,
3531 DIFF_STATUS_UNKNOWN,
3532 DIFF_STATUS_UNMERGED,
3533 DIFF_STATUS_FILTER_AON,
3534 DIFF_STATUS_FILTER_BROKEN,
3535 '\0',
3536 };
3537
3538 static unsigned int filter_bit['Z' + 1];
3539
3540 static void prepare_filter_bits(void)
3541 {
3542 int i;
3543
3544 if (!filter_bit[DIFF_STATUS_ADDED]) {
3545 for (i = 0; diff_status_letters[i]; i++)
3546 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3547 }
3548 }
3549
3550 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3551 {
3552 return opt->filter & filter_bit[(int) status];
3553 }
3554
3555 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3556 {
3557 int i, optch;
3558
3559 prepare_filter_bits();
3560
3561 /*
3562 * If there is a negation e.g. 'd' in the input, and we haven't
3563 * initialized the filter field with another --diff-filter, start
3564 * from full set of bits, except for AON.
3565 */
3566 if (!opt->filter) {
3567 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3568 if (optch < 'a' || 'z' < optch)
3569 continue;
3570 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3571 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3572 break;
3573 }
3574 }
3575
3576 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3577 unsigned int bit;
3578 int negate;
3579
3580 if ('a' <= optch && optch <= 'z') {
3581 negate = 1;
3582 optch = toupper(optch);
3583 } else {
3584 negate = 0;
3585 }
3586
3587 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3588 if (!bit)
3589 return optarg[i];
3590 if (negate)
3591 opt->filter &= ~bit;
3592 else
3593 opt->filter |= bit;
3594 }
3595 return 0;
3596 }
3597
3598 /* Used only by "diff-files" and "diff --no-index" */
3599 void handle_deprecated_show_diff_q(struct diff_options *opt)
3600 {
3601 warning("'diff -q' and 'diff-files -q' are deprecated.");
3602 warning("Use 'diff --diff-filter=d' instead to ignore deleted filepairs.");
3603 parse_diff_filter_opt("d", opt);
3604 }
3605
3606 static void enable_patch_output(int *fmt) {
3607 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3608 *fmt |= DIFF_FORMAT_PATCH;
3609 }
3610
3611 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3612 {
3613 const char *arg = av[0];
3614 const char *optarg;
3615 int argcount;
3616
3617 /* Output format options */
3618 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3619 || opt_arg(arg, 'U', "unified", &options->context))
3620 enable_patch_output(&options->output_format);
3621 else if (!strcmp(arg, "--raw"))
3622 options->output_format |= DIFF_FORMAT_RAW;
3623 else if (!strcmp(arg, "--patch-with-raw")) {
3624 enable_patch_output(&options->output_format);
3625 options->output_format |= DIFF_FORMAT_RAW;
3626 } else if (!strcmp(arg, "--numstat"))
3627 options->output_format |= DIFF_FORMAT_NUMSTAT;
3628 else if (!strcmp(arg, "--shortstat"))
3629 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3630 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3631 return parse_dirstat_opt(options, "");
3632 else if (starts_with(arg, "-X"))
3633 return parse_dirstat_opt(options, arg + 2);
3634 else if (starts_with(arg, "--dirstat="))
3635 return parse_dirstat_opt(options, arg + 10);
3636 else if (!strcmp(arg, "--cumulative"))
3637 return parse_dirstat_opt(options, "cumulative");
3638 else if (!strcmp(arg, "--dirstat-by-file"))
3639 return parse_dirstat_opt(options, "files");
3640 else if (starts_with(arg, "--dirstat-by-file=")) {
3641 parse_dirstat_opt(options, "files");
3642 return parse_dirstat_opt(options, arg + 18);
3643 }
3644 else if (!strcmp(arg, "--check"))
3645 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3646 else if (!strcmp(arg, "--summary"))
3647 options->output_format |= DIFF_FORMAT_SUMMARY;
3648 else if (!strcmp(arg, "--patch-with-stat")) {
3649 enable_patch_output(&options->output_format);
3650 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3651 } else if (!strcmp(arg, "--name-only"))
3652 options->output_format |= DIFF_FORMAT_NAME;
3653 else if (!strcmp(arg, "--name-status"))
3654 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3655 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3656 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3657 else if (starts_with(arg, "--stat"))
3658 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3659 return stat_opt(options, av);
3660
3661 /* renames options */
3662 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3663 !strcmp(arg, "--break-rewrites")) {
3664 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3665 return error("invalid argument to -B: %s", arg+2);
3666 }
3667 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3668 !strcmp(arg, "--find-renames")) {
3669 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3670 return error("invalid argument to -M: %s", arg+2);
3671 options->detect_rename = DIFF_DETECT_RENAME;
3672 }
3673 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3674 options->irreversible_delete = 1;
3675 }
3676 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3677 !strcmp(arg, "--find-copies")) {
3678 if (options->detect_rename == DIFF_DETECT_COPY)
3679 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3680 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3681 return error("invalid argument to -C: %s", arg+2);
3682 options->detect_rename = DIFF_DETECT_COPY;
3683 }
3684 else if (!strcmp(arg, "--no-renames"))
3685 options->detect_rename = 0;
3686 else if (!strcmp(arg, "--rename-empty"))
3687 DIFF_OPT_SET(options, RENAME_EMPTY);
3688 else if (!strcmp(arg, "--no-rename-empty"))
3689 DIFF_OPT_CLR(options, RENAME_EMPTY);
3690 else if (!strcmp(arg, "--relative"))
3691 DIFF_OPT_SET(options, RELATIVE_NAME);
3692 else if (starts_with(arg, "--relative=")) {
3693 DIFF_OPT_SET(options, RELATIVE_NAME);
3694 options->prefix = arg + 11;
3695 }
3696
3697 /* xdiff options */
3698 else if (!strcmp(arg, "--minimal"))
3699 DIFF_XDL_SET(options, NEED_MINIMAL);
3700 else if (!strcmp(arg, "--no-minimal"))
3701 DIFF_XDL_CLR(options, NEED_MINIMAL);
3702 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3703 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3704 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3705 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3706 else if (!strcmp(arg, "--ignore-space-at-eol"))
3707 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3708 else if (!strcmp(arg, "--ignore-blank-lines"))
3709 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3710 else if (!strcmp(arg, "--patience"))
3711 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3712 else if (!strcmp(arg, "--histogram"))
3713 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3714 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3715 long value = parse_algorithm_value(optarg);
3716 if (value < 0)
3717 return error("option diff-algorithm accepts \"myers\", "
3718 "\"minimal\", \"patience\" and \"histogram\"");
3719 /* clear out previous settings */
3720 DIFF_XDL_CLR(options, NEED_MINIMAL);
3721 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3722 options->xdl_opts |= value;
3723 return argcount;
3724 }
3725
3726 /* flags options */
3727 else if (!strcmp(arg, "--binary")) {
3728 enable_patch_output(&options->output_format);
3729 DIFF_OPT_SET(options, BINARY);
3730 }
3731 else if (!strcmp(arg, "--full-index"))
3732 DIFF_OPT_SET(options, FULL_INDEX);
3733 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3734 DIFF_OPT_SET(options, TEXT);
3735 else if (!strcmp(arg, "-R"))
3736 DIFF_OPT_SET(options, REVERSE_DIFF);
3737 else if (!strcmp(arg, "--find-copies-harder"))
3738 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3739 else if (!strcmp(arg, "--follow"))
3740 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3741 else if (!strcmp(arg, "--no-follow"))
3742 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3743 else if (!strcmp(arg, "--color"))
3744 options->use_color = 1;
3745 else if (starts_with(arg, "--color=")) {
3746 int value = git_config_colorbool(NULL, arg+8);
3747 if (value < 0)
3748 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3749 options->use_color = value;
3750 }
3751 else if (!strcmp(arg, "--no-color"))
3752 options->use_color = 0;
3753 else if (!strcmp(arg, "--color-words")) {
3754 options->use_color = 1;
3755 options->word_diff = DIFF_WORDS_COLOR;
3756 }
3757 else if (starts_with(arg, "--color-words=")) {
3758 options->use_color = 1;
3759 options->word_diff = DIFF_WORDS_COLOR;
3760 options->word_regex = arg + 14;
3761 }
3762 else if (!strcmp(arg, "--word-diff")) {
3763 if (options->word_diff == DIFF_WORDS_NONE)
3764 options->word_diff = DIFF_WORDS_PLAIN;
3765 }
3766 else if (starts_with(arg, "--word-diff=")) {
3767 const char *type = arg + 12;
3768 if (!strcmp(type, "plain"))
3769 options->word_diff = DIFF_WORDS_PLAIN;
3770 else if (!strcmp(type, "color")) {
3771 options->use_color = 1;
3772 options->word_diff = DIFF_WORDS_COLOR;
3773 }
3774 else if (!strcmp(type, "porcelain"))
3775 options->word_diff = DIFF_WORDS_PORCELAIN;
3776 else if (!strcmp(type, "none"))
3777 options->word_diff = DIFF_WORDS_NONE;
3778 else
3779 die("bad --word-diff argument: %s", type);
3780 }
3781 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3782 if (options->word_diff == DIFF_WORDS_NONE)
3783 options->word_diff = DIFF_WORDS_PLAIN;
3784 options->word_regex = optarg;
3785 return argcount;
3786 }
3787 else if (!strcmp(arg, "--exit-code"))
3788 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3789 else if (!strcmp(arg, "--quiet"))
3790 DIFF_OPT_SET(options, QUICK);
3791 else if (!strcmp(arg, "--ext-diff"))
3792 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3793 else if (!strcmp(arg, "--no-ext-diff"))
3794 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3795 else if (!strcmp(arg, "--textconv"))
3796 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3797 else if (!strcmp(arg, "--no-textconv"))
3798 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3799 else if (!strcmp(arg, "--ignore-submodules")) {
3800 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3801 handle_ignore_submodules_arg(options, "all");
3802 } else if (starts_with(arg, "--ignore-submodules=")) {
3803 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3804 handle_ignore_submodules_arg(options, arg + 20);
3805 } else if (!strcmp(arg, "--submodule"))
3806 DIFF_OPT_SET(options, SUBMODULE_LOG);
3807 else if (starts_with(arg, "--submodule="))
3808 return parse_submodule_opt(options, arg + 12);
3809
3810 /* misc options */
3811 else if (!strcmp(arg, "-z"))
3812 options->line_termination = 0;
3813 else if ((argcount = short_opt('l', av, &optarg))) {
3814 options->rename_limit = strtoul(optarg, NULL, 10);
3815 return argcount;
3816 }
3817 else if ((argcount = short_opt('S', av, &optarg))) {
3818 options->pickaxe = optarg;
3819 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3820 return argcount;
3821 } else if ((argcount = short_opt('G', av, &optarg))) {
3822 options->pickaxe = optarg;
3823 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3824 return argcount;
3825 }
3826 else if (!strcmp(arg, "--pickaxe-all"))
3827 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3828 else if (!strcmp(arg, "--pickaxe-regex"))
3829 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3830 else if ((argcount = short_opt('O', av, &optarg))) {
3831 options->orderfile = optarg;
3832 return argcount;
3833 }
3834 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3835 int offending = parse_diff_filter_opt(optarg, options);
3836 if (offending)
3837 die("unknown change class '%c' in --diff-filter=%s",
3838 offending, optarg);
3839 return argcount;
3840 }
3841 else if (!strcmp(arg, "--abbrev"))
3842 options->abbrev = DEFAULT_ABBREV;
3843 else if (starts_with(arg, "--abbrev=")) {
3844 options->abbrev = strtoul(arg + 9, NULL, 10);
3845 if (options->abbrev < MINIMUM_ABBREV)
3846 options->abbrev = MINIMUM_ABBREV;
3847 else if (40 < options->abbrev)
3848 options->abbrev = 40;
3849 }
3850 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3851 options->a_prefix = optarg;
3852 return argcount;
3853 }
3854 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3855 options->b_prefix = optarg;
3856 return argcount;
3857 }
3858 else if (!strcmp(arg, "--no-prefix"))
3859 options->a_prefix = options->b_prefix = "";
3860 else if (opt_arg(arg, '\0', "inter-hunk-context",
3861 &options->interhunkcontext))
3862 ;
3863 else if (!strcmp(arg, "-W"))
3864 DIFF_OPT_SET(options, FUNCCONTEXT);
3865 else if (!strcmp(arg, "--function-context"))
3866 DIFF_OPT_SET(options, FUNCCONTEXT);
3867 else if (!strcmp(arg, "--no-function-context"))
3868 DIFF_OPT_CLR(options, FUNCCONTEXT);
3869 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3870 options->file = fopen(optarg, "w");
3871 if (!options->file)
3872 die_errno("Could not open '%s'", optarg);
3873 options->close_file = 1;
3874 return argcount;
3875 } else
3876 return 0;
3877 return 1;
3878 }
3879
3880 int parse_rename_score(const char **cp_p)
3881 {
3882 unsigned long num, scale;
3883 int ch, dot;
3884 const char *cp = *cp_p;
3885
3886 num = 0;
3887 scale = 1;
3888 dot = 0;
3889 for (;;) {
3890 ch = *cp;
3891 if ( !dot && ch == '.' ) {
3892 scale = 1;
3893 dot = 1;
3894 } else if ( ch == '%' ) {
3895 scale = dot ? scale*100 : 100;
3896 cp++; /* % is always at the end */
3897 break;
3898 } else if ( ch >= '0' && ch <= '9' ) {
3899 if ( scale < 100000 ) {
3900 scale *= 10;
3901 num = (num*10) + (ch-'0');
3902 }
3903 } else {
3904 break;
3905 }
3906 cp++;
3907 }
3908 *cp_p = cp;
3909
3910 /* user says num divided by scale and we say internally that
3911 * is MAX_SCORE * num / scale.
3912 */
3913 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3914 }
3915
3916 static int diff_scoreopt_parse(const char *opt)
3917 {
3918 int opt1, opt2, cmd;
3919
3920 if (*opt++ != '-')
3921 return -1;
3922 cmd = *opt++;
3923 if (cmd == '-') {
3924 /* convert the long-form arguments into short-form versions */
3925 if (starts_with(opt, "break-rewrites")) {
3926 opt += strlen("break-rewrites");
3927 if (*opt == 0 || *opt++ == '=')
3928 cmd = 'B';
3929 } else if (starts_with(opt, "find-copies")) {
3930 opt += strlen("find-copies");
3931 if (*opt == 0 || *opt++ == '=')
3932 cmd = 'C';
3933 } else if (starts_with(opt, "find-renames")) {
3934 opt += strlen("find-renames");
3935 if (*opt == 0 || *opt++ == '=')
3936 cmd = 'M';
3937 }
3938 }
3939 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3940 return -1; /* that is not a -M, -C nor -B option */
3941
3942 opt1 = parse_rename_score(&opt);
3943 if (cmd != 'B')
3944 opt2 = 0;
3945 else {
3946 if (*opt == 0)
3947 opt2 = 0;
3948 else if (*opt != '/')
3949 return -1; /* we expect -B80/99 or -B80 */
3950 else {
3951 opt++;
3952 opt2 = parse_rename_score(&opt);
3953 }
3954 }
3955 if (*opt != 0)
3956 return -1;
3957 return opt1 | (opt2 << 16);
3958 }
3959
3960 struct diff_queue_struct diff_queued_diff;
3961
3962 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3963 {
3964 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
3965 queue->queue[queue->nr++] = dp;
3966 }
3967
3968 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3969 struct diff_filespec *one,
3970 struct diff_filespec *two)
3971 {
3972 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3973 dp->one = one;
3974 dp->two = two;
3975 if (queue)
3976 diff_q(queue, dp);
3977 return dp;
3978 }
3979
3980 void diff_free_filepair(struct diff_filepair *p)
3981 {
3982 free_filespec(p->one);
3983 free_filespec(p->two);
3984 free(p);
3985 }
3986
3987 /* This is different from find_unique_abbrev() in that
3988 * it stuffs the result with dots for alignment.
3989 */
3990 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3991 {
3992 int abblen;
3993 const char *abbrev;
3994 if (len == 40)
3995 return sha1_to_hex(sha1);
3996
3997 abbrev = find_unique_abbrev(sha1, len);
3998 abblen = strlen(abbrev);
3999 if (abblen < 37) {
4000 static char hex[41];
4001 if (len < abblen && abblen <= len + 2)
4002 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
4003 else
4004 sprintf(hex, "%s...", abbrev);
4005 return hex;
4006 }
4007 return sha1_to_hex(sha1);
4008 }
4009
4010 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4011 {
4012 int line_termination = opt->line_termination;
4013 int inter_name_termination = line_termination ? '\t' : '\0';
4014
4015 fprintf(opt->file, "%s", diff_line_prefix(opt));
4016 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4017 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4018 diff_unique_abbrev(p->one->sha1, opt->abbrev));
4019 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
4020 }
4021 if (p->score) {
4022 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4023 inter_name_termination);
4024 } else {
4025 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4026 }
4027
4028 if (p->status == DIFF_STATUS_COPIED ||
4029 p->status == DIFF_STATUS_RENAMED) {
4030 const char *name_a, *name_b;
4031 name_a = p->one->path;
4032 name_b = p->two->path;
4033 strip_prefix(opt->prefix_length, &name_a, &name_b);
4034 write_name_quoted(name_a, opt->file, inter_name_termination);
4035 write_name_quoted(name_b, opt->file, line_termination);
4036 } else {
4037 const char *name_a, *name_b;
4038 name_a = p->one->mode ? p->one->path : p->two->path;
4039 name_b = NULL;
4040 strip_prefix(opt->prefix_length, &name_a, &name_b);
4041 write_name_quoted(name_a, opt->file, line_termination);
4042 }
4043 }
4044
4045 int diff_unmodified_pair(struct diff_filepair *p)
4046 {
4047 /* This function is written stricter than necessary to support
4048 * the currently implemented transformers, but the idea is to
4049 * let transformers to produce diff_filepairs any way they want,
4050 * and filter and clean them up here before producing the output.
4051 */
4052 struct diff_filespec *one = p->one, *two = p->two;
4053
4054 if (DIFF_PAIR_UNMERGED(p))
4055 return 0; /* unmerged is interesting */
4056
4057 /* deletion, addition, mode or type change
4058 * and rename are all interesting.
4059 */
4060 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4061 DIFF_PAIR_MODE_CHANGED(p) ||
4062 strcmp(one->path, two->path))
4063 return 0;
4064
4065 /* both are valid and point at the same path. that is, we are
4066 * dealing with a change.
4067 */
4068 if (one->sha1_valid && two->sha1_valid &&
4069 !hashcmp(one->sha1, two->sha1) &&
4070 !one->dirty_submodule && !two->dirty_submodule)
4071 return 1; /* no change */
4072 if (!one->sha1_valid && !two->sha1_valid)
4073 return 1; /* both look at the same file on the filesystem. */
4074 return 0;
4075 }
4076
4077 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4078 {
4079 if (diff_unmodified_pair(p))
4080 return;
4081
4082 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4083 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4084 return; /* no tree diffs in patch format */
4085
4086 run_diff(p, o);
4087 }
4088
4089 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4090 struct diffstat_t *diffstat)
4091 {
4092 if (diff_unmodified_pair(p))
4093 return;
4094
4095 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4096 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4097 return; /* no useful stat for tree diffs */
4098
4099 run_diffstat(p, o, diffstat);
4100 }
4101
4102 static void diff_flush_checkdiff(struct diff_filepair *p,
4103 struct diff_options *o)
4104 {
4105 if (diff_unmodified_pair(p))
4106 return;
4107
4108 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4109 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4110 return; /* nothing to check in tree diffs */
4111
4112 run_checkdiff(p, o);
4113 }
4114
4115 int diff_queue_is_empty(void)
4116 {
4117 struct diff_queue_struct *q = &diff_queued_diff;
4118 int i;
4119 for (i = 0; i < q->nr; i++)
4120 if (!diff_unmodified_pair(q->queue[i]))
4121 return 0;
4122 return 1;
4123 }
4124
4125 #if DIFF_DEBUG
4126 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4127 {
4128 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4129 x, one ? one : "",
4130 s->path,
4131 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4132 s->mode,
4133 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4134 fprintf(stderr, "queue[%d] %s size %lu\n",
4135 x, one ? one : "",
4136 s->size);
4137 }
4138
4139 void diff_debug_filepair(const struct diff_filepair *p, int i)
4140 {
4141 diff_debug_filespec(p->one, i, "one");
4142 diff_debug_filespec(p->two, i, "two");
4143 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4144 p->score, p->status ? p->status : '?',
4145 p->one->rename_used, p->broken_pair);
4146 }
4147
4148 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4149 {
4150 int i;
4151 if (msg)
4152 fprintf(stderr, "%s\n", msg);
4153 fprintf(stderr, "q->nr = %d\n", q->nr);
4154 for (i = 0; i < q->nr; i++) {
4155 struct diff_filepair *p = q->queue[i];
4156 diff_debug_filepair(p, i);
4157 }
4158 }
4159 #endif
4160
4161 static void diff_resolve_rename_copy(void)
4162 {
4163 int i;
4164 struct diff_filepair *p;
4165 struct diff_queue_struct *q = &diff_queued_diff;
4166
4167 diff_debug_queue("resolve-rename-copy", q);
4168
4169 for (i = 0; i < q->nr; i++) {
4170 p = q->queue[i];
4171 p->status = 0; /* undecided */
4172 if (DIFF_PAIR_UNMERGED(p))
4173 p->status = DIFF_STATUS_UNMERGED;
4174 else if (!DIFF_FILE_VALID(p->one))
4175 p->status = DIFF_STATUS_ADDED;
4176 else if (!DIFF_FILE_VALID(p->two))
4177 p->status = DIFF_STATUS_DELETED;
4178 else if (DIFF_PAIR_TYPE_CHANGED(p))
4179 p->status = DIFF_STATUS_TYPE_CHANGED;
4180
4181 /* from this point on, we are dealing with a pair
4182 * whose both sides are valid and of the same type, i.e.
4183 * either in-place edit or rename/copy edit.
4184 */
4185 else if (DIFF_PAIR_RENAME(p)) {
4186 /*
4187 * A rename might have re-connected a broken
4188 * pair up, causing the pathnames to be the
4189 * same again. If so, that's not a rename at
4190 * all, just a modification..
4191 *
4192 * Otherwise, see if this source was used for
4193 * multiple renames, in which case we decrement
4194 * the count, and call it a copy.
4195 */
4196 if (!strcmp(p->one->path, p->two->path))
4197 p->status = DIFF_STATUS_MODIFIED;
4198 else if (--p->one->rename_used > 0)
4199 p->status = DIFF_STATUS_COPIED;
4200 else
4201 p->status = DIFF_STATUS_RENAMED;
4202 }
4203 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4204 p->one->mode != p->two->mode ||
4205 p->one->dirty_submodule ||
4206 p->two->dirty_submodule ||
4207 is_null_sha1(p->one->sha1))
4208 p->status = DIFF_STATUS_MODIFIED;
4209 else {
4210 /* This is a "no-change" entry and should not
4211 * happen anymore, but prepare for broken callers.
4212 */
4213 error("feeding unmodified %s to diffcore",
4214 p->one->path);
4215 p->status = DIFF_STATUS_UNKNOWN;
4216 }
4217 }
4218 diff_debug_queue("resolve-rename-copy done", q);
4219 }
4220
4221 static int check_pair_status(struct diff_filepair *p)
4222 {
4223 switch (p->status) {
4224 case DIFF_STATUS_UNKNOWN:
4225 return 0;
4226 case 0:
4227 die("internal error in diff-resolve-rename-copy");
4228 default:
4229 return 1;
4230 }
4231 }
4232
4233 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4234 {
4235 int fmt = opt->output_format;
4236
4237 if (fmt & DIFF_FORMAT_CHECKDIFF)
4238 diff_flush_checkdiff(p, opt);
4239 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4240 diff_flush_raw(p, opt);
4241 else if (fmt & DIFF_FORMAT_NAME) {
4242 const char *name_a, *name_b;
4243 name_a = p->two->path;
4244 name_b = NULL;
4245 strip_prefix(opt->prefix_length, &name_a, &name_b);
4246 write_name_quoted(name_a, opt->file, opt->line_termination);
4247 }
4248 }
4249
4250 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4251 {
4252 if (fs->mode)
4253 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4254 else
4255 fprintf(file, " %s ", newdelete);
4256 write_name_quoted(fs->path, file, '\n');
4257 }
4258
4259
4260 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4261 const char *line_prefix)
4262 {
4263 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4264 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4265 p->two->mode, show_name ? ' ' : '\n');
4266 if (show_name) {
4267 write_name_quoted(p->two->path, file, '\n');
4268 }
4269 }
4270 }
4271
4272 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4273 const char *line_prefix)
4274 {
4275 char *names = pprint_rename(p->one->path, p->two->path);
4276
4277 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4278 free(names);
4279 show_mode_change(file, p, 0, line_prefix);
4280 }
4281
4282 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4283 {
4284 FILE *file = opt->file;
4285 const char *line_prefix = diff_line_prefix(opt);
4286
4287 switch(p->status) {
4288 case DIFF_STATUS_DELETED:
4289 fputs(line_prefix, file);
4290 show_file_mode_name(file, "delete", p->one);
4291 break;
4292 case DIFF_STATUS_ADDED:
4293 fputs(line_prefix, file);
4294 show_file_mode_name(file, "create", p->two);
4295 break;
4296 case DIFF_STATUS_COPIED:
4297 fputs(line_prefix, file);
4298 show_rename_copy(file, "copy", p, line_prefix);
4299 break;
4300 case DIFF_STATUS_RENAMED:
4301 fputs(line_prefix, file);
4302 show_rename_copy(file, "rename", p, line_prefix);
4303 break;
4304 default:
4305 if (p->score) {
4306 fprintf(file, "%s rewrite ", line_prefix);
4307 write_name_quoted(p->two->path, file, ' ');
4308 fprintf(file, "(%d%%)\n", similarity_index(p));
4309 }
4310 show_mode_change(file, p, !p->score, line_prefix);
4311 break;
4312 }
4313 }
4314
4315 struct patch_id_t {
4316 git_SHA_CTX *ctx;
4317 int patchlen;
4318 };
4319
4320 static int remove_space(char *line, int len)
4321 {
4322 int i;
4323 char *dst = line;
4324 unsigned char c;
4325
4326 for (i = 0; i < len; i++)
4327 if (!isspace((c = line[i])))
4328 *dst++ = c;
4329
4330 return dst - line;
4331 }
4332
4333 static void patch_id_consume(void *priv, char *line, unsigned long len)
4334 {
4335 struct patch_id_t *data = priv;
4336 int new_len;
4337
4338 /* Ignore line numbers when computing the SHA1 of the patch */
4339 if (starts_with(line, "@@ -"))
4340 return;
4341
4342 new_len = remove_space(line, len);
4343
4344 git_SHA1_Update(data->ctx, line, new_len);
4345 data->patchlen += new_len;
4346 }
4347
4348 /* returns 0 upon success, and writes result into sha1 */
4349 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4350 {
4351 struct diff_queue_struct *q = &diff_queued_diff;
4352 int i;
4353 git_SHA_CTX ctx;
4354 struct patch_id_t data;
4355 char buffer[PATH_MAX * 4 + 20];
4356
4357 git_SHA1_Init(&ctx);
4358 memset(&data, 0, sizeof(struct patch_id_t));
4359 data.ctx = &ctx;
4360
4361 for (i = 0; i < q->nr; i++) {
4362 xpparam_t xpp;
4363 xdemitconf_t xecfg;
4364 mmfile_t mf1, mf2;
4365 struct diff_filepair *p = q->queue[i];
4366 int len1, len2;
4367
4368 memset(&xpp, 0, sizeof(xpp));
4369 memset(&xecfg, 0, sizeof(xecfg));
4370 if (p->status == 0)
4371 return error("internal diff status error");
4372 if (p->status == DIFF_STATUS_UNKNOWN)
4373 continue;
4374 if (diff_unmodified_pair(p))
4375 continue;
4376 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4377 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4378 continue;
4379 if (DIFF_PAIR_UNMERGED(p))
4380 continue;
4381
4382 diff_fill_sha1_info(p->one);
4383 diff_fill_sha1_info(p->two);
4384 if (fill_mmfile(&mf1, p->one) < 0 ||
4385 fill_mmfile(&mf2, p->two) < 0)
4386 return error("unable to read files to diff");
4387
4388 len1 = remove_space(p->one->path, strlen(p->one->path));
4389 len2 = remove_space(p->two->path, strlen(p->two->path));
4390 if (p->one->mode == 0)
4391 len1 = snprintf(buffer, sizeof(buffer),
4392 "diff--gita/%.*sb/%.*s"
4393 "newfilemode%06o"
4394 "---/dev/null"
4395 "+++b/%.*s",
4396 len1, p->one->path,
4397 len2, p->two->path,
4398 p->two->mode,
4399 len2, p->two->path);
4400 else if (p->two->mode == 0)
4401 len1 = snprintf(buffer, sizeof(buffer),
4402 "diff--gita/%.*sb/%.*s"
4403 "deletedfilemode%06o"
4404 "---a/%.*s"
4405 "+++/dev/null",
4406 len1, p->one->path,
4407 len2, p->two->path,
4408 p->one->mode,
4409 len1, p->one->path);
4410 else
4411 len1 = snprintf(buffer, sizeof(buffer),
4412 "diff--gita/%.*sb/%.*s"
4413 "---a/%.*s"
4414 "+++b/%.*s",
4415 len1, p->one->path,
4416 len2, p->two->path,
4417 len1, p->one->path,
4418 len2, p->two->path);
4419 git_SHA1_Update(&ctx, buffer, len1);
4420
4421 if (diff_filespec_is_binary(p->one) ||
4422 diff_filespec_is_binary(p->two)) {
4423 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4424 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4425 continue;
4426 }
4427
4428 xpp.flags = 0;
4429 xecfg.ctxlen = 3;
4430 xecfg.flags = 0;
4431 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4432 &xpp, &xecfg);
4433 }
4434
4435 git_SHA1_Final(sha1, &ctx);
4436 return 0;
4437 }
4438
4439 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4440 {
4441 struct diff_queue_struct *q = &diff_queued_diff;
4442 int i;
4443 int result = diff_get_patch_id(options, sha1);
4444
4445 for (i = 0; i < q->nr; i++)
4446 diff_free_filepair(q->queue[i]);
4447
4448 free(q->queue);
4449 DIFF_QUEUE_CLEAR(q);
4450
4451 return result;
4452 }
4453
4454 static int is_summary_empty(const struct diff_queue_struct *q)
4455 {
4456 int i;
4457
4458 for (i = 0; i < q->nr; i++) {
4459 const struct diff_filepair *p = q->queue[i];
4460
4461 switch (p->status) {
4462 case DIFF_STATUS_DELETED:
4463 case DIFF_STATUS_ADDED:
4464 case DIFF_STATUS_COPIED:
4465 case DIFF_STATUS_RENAMED:
4466 return 0;
4467 default:
4468 if (p->score)
4469 return 0;
4470 if (p->one->mode && p->two->mode &&
4471 p->one->mode != p->two->mode)
4472 return 0;
4473 break;
4474 }
4475 }
4476 return 1;
4477 }
4478
4479 static const char rename_limit_warning[] =
4480 "inexact rename detection was skipped due to too many files.";
4481
4482 static const char degrade_cc_to_c_warning[] =
4483 "only found copies from modified paths due to too many files.";
4484
4485 static const char rename_limit_advice[] =
4486 "you may want to set your %s variable to at least "
4487 "%d and retry the command.";
4488
4489 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4490 {
4491 if (degraded_cc)
4492 warning(degrade_cc_to_c_warning);
4493 else if (needed)
4494 warning(rename_limit_warning);
4495 else
4496 return;
4497 if (0 < needed && needed < 32767)
4498 warning(rename_limit_advice, varname, needed);
4499 }
4500
4501 void diff_flush(struct diff_options *options)
4502 {
4503 struct diff_queue_struct *q = &diff_queued_diff;
4504 int i, output_format = options->output_format;
4505 int separator = 0;
4506 int dirstat_by_line = 0;
4507
4508 /*
4509 * Order: raw, stat, summary, patch
4510 * or: name/name-status/checkdiff (other bits clear)
4511 */
4512 if (!q->nr)
4513 goto free_queue;
4514
4515 if (output_format & (DIFF_FORMAT_RAW |
4516 DIFF_FORMAT_NAME |
4517 DIFF_FORMAT_NAME_STATUS |
4518 DIFF_FORMAT_CHECKDIFF)) {
4519 for (i = 0; i < q->nr; i++) {
4520 struct diff_filepair *p = q->queue[i];
4521 if (check_pair_status(p))
4522 flush_one_pair(p, options);
4523 }
4524 separator++;
4525 }
4526
4527 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4528 dirstat_by_line = 1;
4529
4530 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4531 dirstat_by_line) {
4532 struct diffstat_t diffstat;
4533
4534 memset(&diffstat, 0, sizeof(struct diffstat_t));
4535 for (i = 0; i < q->nr; i++) {
4536 struct diff_filepair *p = q->queue[i];
4537 if (check_pair_status(p))
4538 diff_flush_stat(p, options, &diffstat);
4539 }
4540 if (output_format & DIFF_FORMAT_NUMSTAT)
4541 show_numstat(&diffstat, options);
4542 if (output_format & DIFF_FORMAT_DIFFSTAT)
4543 show_stats(&diffstat, options);
4544 if (output_format & DIFF_FORMAT_SHORTSTAT)
4545 show_shortstats(&diffstat, options);
4546 if (output_format & DIFF_FORMAT_DIRSTAT)
4547 show_dirstat_by_line(&diffstat, options);
4548 free_diffstat_info(&diffstat);
4549 separator++;
4550 }
4551 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4552 show_dirstat(options);
4553
4554 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4555 for (i = 0; i < q->nr; i++) {
4556 diff_summary(options, q->queue[i]);
4557 }
4558 separator++;
4559 }
4560
4561 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4562 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4563 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4564 /*
4565 * run diff_flush_patch for the exit status. setting
4566 * options->file to /dev/null should be safe, because we
4567 * aren't supposed to produce any output anyway.
4568 */
4569 if (options->close_file)
4570 fclose(options->file);
4571 options->file = fopen("/dev/null", "w");
4572 if (!options->file)
4573 die_errno("Could not open /dev/null");
4574 options->close_file = 1;
4575 for (i = 0; i < q->nr; i++) {
4576 struct diff_filepair *p = q->queue[i];
4577 if (check_pair_status(p))
4578 diff_flush_patch(p, options);
4579 if (options->found_changes)
4580 break;
4581 }
4582 }
4583
4584 if (output_format & DIFF_FORMAT_PATCH) {
4585 if (separator) {
4586 fprintf(options->file, "%s%c",
4587 diff_line_prefix(options),
4588 options->line_termination);
4589 if (options->stat_sep) {
4590 /* attach patch instead of inline */
4591 fputs(options->stat_sep, options->file);
4592 }
4593 }
4594
4595 for (i = 0; i < q->nr; i++) {
4596 struct diff_filepair *p = q->queue[i];
4597 if (check_pair_status(p))
4598 diff_flush_patch(p, options);
4599 }
4600 }
4601
4602 if (output_format & DIFF_FORMAT_CALLBACK)
4603 options->format_callback(q, options, options->format_callback_data);
4604
4605 for (i = 0; i < q->nr; i++)
4606 diff_free_filepair(q->queue[i]);
4607 free_queue:
4608 free(q->queue);
4609 DIFF_QUEUE_CLEAR(q);
4610 if (options->close_file)
4611 fclose(options->file);
4612
4613 /*
4614 * Report the content-level differences with HAS_CHANGES;
4615 * diff_addremove/diff_change does not set the bit when
4616 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4617 */
4618 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4619 if (options->found_changes)
4620 DIFF_OPT_SET(options, HAS_CHANGES);
4621 else
4622 DIFF_OPT_CLR(options, HAS_CHANGES);
4623 }
4624 }
4625
4626 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4627 {
4628 return (((p->status == DIFF_STATUS_MODIFIED) &&
4629 ((p->score &&
4630 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4631 (!p->score &&
4632 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4633 ((p->status != DIFF_STATUS_MODIFIED) &&
4634 filter_bit_tst(p->status, options)));
4635 }
4636
4637 static void diffcore_apply_filter(struct diff_options *options)
4638 {
4639 int i;
4640 struct diff_queue_struct *q = &diff_queued_diff;
4641 struct diff_queue_struct outq;
4642
4643 DIFF_QUEUE_CLEAR(&outq);
4644
4645 if (!options->filter)
4646 return;
4647
4648 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4649 int found;
4650 for (i = found = 0; !found && i < q->nr; i++) {
4651 if (match_filter(options, q->queue[i]))
4652 found++;
4653 }
4654 if (found)
4655 return;
4656
4657 /* otherwise we will clear the whole queue
4658 * by copying the empty outq at the end of this
4659 * function, but first clear the current entries
4660 * in the queue.
4661 */
4662 for (i = 0; i < q->nr; i++)
4663 diff_free_filepair(q->queue[i]);
4664 }
4665 else {
4666 /* Only the matching ones */
4667 for (i = 0; i < q->nr; i++) {
4668 struct diff_filepair *p = q->queue[i];
4669 if (match_filter(options, p))
4670 diff_q(&outq, p);
4671 else
4672 diff_free_filepair(p);
4673 }
4674 }
4675 free(q->queue);
4676 *q = outq;
4677 }
4678
4679 /* Check whether two filespecs with the same mode and size are identical */
4680 static int diff_filespec_is_identical(struct diff_filespec *one,
4681 struct diff_filespec *two)
4682 {
4683 if (S_ISGITLINK(one->mode))
4684 return 0;
4685 if (diff_populate_filespec(one, 0))
4686 return 0;
4687 if (diff_populate_filespec(two, 0))
4688 return 0;
4689 return !memcmp(one->data, two->data, one->size);
4690 }
4691
4692 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4693 {
4694 int i;
4695 struct diff_queue_struct *q = &diff_queued_diff;
4696 struct diff_queue_struct outq;
4697 DIFF_QUEUE_CLEAR(&outq);
4698
4699 for (i = 0; i < q->nr; i++) {
4700 struct diff_filepair *p = q->queue[i];
4701
4702 /*
4703 * 1. Entries that come from stat info dirtiness
4704 * always have both sides (iow, not create/delete),
4705 * one side of the object name is unknown, with
4706 * the same mode and size. Keep the ones that
4707 * do not match these criteria. They have real
4708 * differences.
4709 *
4710 * 2. At this point, the file is known to be modified,
4711 * with the same mode and size, and the object
4712 * name of one side is unknown. Need to inspect
4713 * the identical contents.
4714 */
4715 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4716 !DIFF_FILE_VALID(p->two) ||
4717 (p->one->sha1_valid && p->two->sha1_valid) ||
4718 (p->one->mode != p->two->mode) ||
4719 diff_populate_filespec(p->one, 1) ||
4720 diff_populate_filespec(p->two, 1) ||
4721 (p->one->size != p->two->size) ||
4722 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4723 diff_q(&outq, p);
4724 else {
4725 /*
4726 * The caller can subtract 1 from skip_stat_unmatch
4727 * to determine how many paths were dirty only
4728 * due to stat info mismatch.
4729 */
4730 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4731 diffopt->skip_stat_unmatch++;
4732 diff_free_filepair(p);
4733 }
4734 }
4735 free(q->queue);
4736 *q = outq;
4737 }
4738
4739 static int diffnamecmp(const void *a_, const void *b_)
4740 {
4741 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4742 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4743 const char *name_a, *name_b;
4744
4745 name_a = a->one ? a->one->path : a->two->path;
4746 name_b = b->one ? b->one->path : b->two->path;
4747 return strcmp(name_a, name_b);
4748 }
4749
4750 void diffcore_fix_diff_index(struct diff_options *options)
4751 {
4752 struct diff_queue_struct *q = &diff_queued_diff;
4753 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4754 }
4755
4756 void diffcore_std(struct diff_options *options)
4757 {
4758 if (options->skip_stat_unmatch)
4759 diffcore_skip_stat_unmatch(options);
4760 if (!options->found_follow) {
4761 /* See try_to_follow_renames() in tree-diff.c */
4762 if (options->break_opt != -1)
4763 diffcore_break(options->break_opt);
4764 if (options->detect_rename)
4765 diffcore_rename(options);
4766 if (options->break_opt != -1)
4767 diffcore_merge_broken();
4768 }
4769 if (options->pickaxe)
4770 diffcore_pickaxe(options);
4771 if (options->orderfile)
4772 diffcore_order(options->orderfile);
4773 if (!options->found_follow)
4774 /* See try_to_follow_renames() in tree-diff.c */
4775 diff_resolve_rename_copy();
4776 diffcore_apply_filter(options);
4777
4778 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4779 DIFF_OPT_SET(options, HAS_CHANGES);
4780 else
4781 DIFF_OPT_CLR(options, HAS_CHANGES);
4782
4783 options->found_follow = 0;
4784 }
4785
4786 int diff_result_code(struct diff_options *opt, int status)
4787 {
4788 int result = 0;
4789
4790 diff_warn_rename_limit("diff.renameLimit",
4791 opt->needed_rename_limit,
4792 opt->degraded_cc_to_c);
4793 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4794 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4795 return status;
4796 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4797 DIFF_OPT_TST(opt, HAS_CHANGES))
4798 result |= 01;
4799 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4800 DIFF_OPT_TST(opt, CHECK_FAILED))
4801 result |= 02;
4802 return result;
4803 }
4804
4805 int diff_can_quit_early(struct diff_options *opt)
4806 {
4807 return (DIFF_OPT_TST(opt, QUICK) &&
4808 !opt->filter &&
4809 DIFF_OPT_TST(opt, HAS_CHANGES));
4810 }
4811
4812 /*
4813 * Shall changes to this submodule be ignored?
4814 *
4815 * Submodule changes can be configured to be ignored separately for each path,
4816 * but that configuration can be overridden from the command line.
4817 */
4818 static int is_submodule_ignored(const char *path, struct diff_options *options)
4819 {
4820 int ignored = 0;
4821 unsigned orig_flags = options->flags;
4822 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4823 set_diffopt_flags_from_submodule_config(options, path);
4824 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4825 ignored = 1;
4826 options->flags = orig_flags;
4827 return ignored;
4828 }
4829
4830 void diff_addremove(struct diff_options *options,
4831 int addremove, unsigned mode,
4832 const unsigned char *sha1,
4833 int sha1_valid,
4834 const char *concatpath, unsigned dirty_submodule)
4835 {
4836 struct diff_filespec *one, *two;
4837
4838 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4839 return;
4840
4841 /* This may look odd, but it is a preparation for
4842 * feeding "there are unchanged files which should
4843 * not produce diffs, but when you are doing copy
4844 * detection you would need them, so here they are"
4845 * entries to the diff-core. They will be prefixed
4846 * with something like '=' or '*' (I haven't decided
4847 * which but should not make any difference).
4848 * Feeding the same new and old to diff_change()
4849 * also has the same effect.
4850 * Before the final output happens, they are pruned after
4851 * merged into rename/copy pairs as appropriate.
4852 */
4853 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4854 addremove = (addremove == '+' ? '-' :
4855 addremove == '-' ? '+' : addremove);
4856
4857 if (options->prefix &&
4858 strncmp(concatpath, options->prefix, options->prefix_length))
4859 return;
4860
4861 one = alloc_filespec(concatpath);
4862 two = alloc_filespec(concatpath);
4863
4864 if (addremove != '+')
4865 fill_filespec(one, sha1, sha1_valid, mode);
4866 if (addremove != '-') {
4867 fill_filespec(two, sha1, sha1_valid, mode);
4868 two->dirty_submodule = dirty_submodule;
4869 }
4870
4871 diff_queue(&diff_queued_diff, one, two);
4872 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4873 DIFF_OPT_SET(options, HAS_CHANGES);
4874 }
4875
4876 void diff_change(struct diff_options *options,
4877 unsigned old_mode, unsigned new_mode,
4878 const unsigned char *old_sha1,
4879 const unsigned char *new_sha1,
4880 int old_sha1_valid, int new_sha1_valid,
4881 const char *concatpath,
4882 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4883 {
4884 struct diff_filespec *one, *two;
4885
4886 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4887 is_submodule_ignored(concatpath, options))
4888 return;
4889
4890 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4891 unsigned tmp;
4892 const unsigned char *tmp_c;
4893 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4894 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4895 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4896 new_sha1_valid = tmp;
4897 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4898 new_dirty_submodule = tmp;
4899 }
4900
4901 if (options->prefix &&
4902 strncmp(concatpath, options->prefix, options->prefix_length))
4903 return;
4904
4905 one = alloc_filespec(concatpath);
4906 two = alloc_filespec(concatpath);
4907 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4908 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4909 one->dirty_submodule = old_dirty_submodule;
4910 two->dirty_submodule = new_dirty_submodule;
4911
4912 diff_queue(&diff_queued_diff, one, two);
4913 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4914 DIFF_OPT_SET(options, HAS_CHANGES);
4915 }
4916
4917 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4918 {
4919 struct diff_filepair *pair;
4920 struct diff_filespec *one, *two;
4921
4922 if (options->prefix &&
4923 strncmp(path, options->prefix, options->prefix_length))
4924 return NULL;
4925
4926 one = alloc_filespec(path);
4927 two = alloc_filespec(path);
4928 pair = diff_queue(&diff_queued_diff, one, two);
4929 pair->is_unmerged = 1;
4930 return pair;
4931 }
4932
4933 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4934 size_t *outsize)
4935 {
4936 struct diff_tempfile *temp;
4937 const char *argv[3];
4938 const char **arg = argv;
4939 struct child_process child;
4940 struct strbuf buf = STRBUF_INIT;
4941 int err = 0;
4942
4943 temp = prepare_temp_file(spec->path, spec);
4944 *arg++ = pgm;
4945 *arg++ = temp->name;
4946 *arg = NULL;
4947
4948 memset(&child, 0, sizeof(child));
4949 child.use_shell = 1;
4950 child.argv = argv;
4951 child.out = -1;
4952 if (start_command(&child)) {
4953 remove_tempfile();
4954 return NULL;
4955 }
4956
4957 if (strbuf_read(&buf, child.out, 0) < 0)
4958 err = error("error reading from textconv command '%s'", pgm);
4959 close(child.out);
4960
4961 if (finish_command(&child) || err) {
4962 strbuf_release(&buf);
4963 remove_tempfile();
4964 return NULL;
4965 }
4966 remove_tempfile();
4967
4968 return strbuf_detach(&buf, outsize);
4969 }
4970
4971 size_t fill_textconv(struct userdiff_driver *driver,
4972 struct diff_filespec *df,
4973 char **outbuf)
4974 {
4975 size_t size;
4976
4977 if (!driver || !driver->textconv) {
4978 if (!DIFF_FILE_VALID(df)) {
4979 *outbuf = "";
4980 return 0;
4981 }
4982 if (diff_populate_filespec(df, 0))
4983 die("unable to read files to diff");
4984 *outbuf = df->data;
4985 return df->size;
4986 }
4987
4988 if (driver->textconv_cache && df->sha1_valid) {
4989 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4990 &size);
4991 if (*outbuf)
4992 return size;
4993 }
4994
4995 *outbuf = run_textconv(driver->textconv, df, &size);
4996 if (!*outbuf)
4997 die("unable to read files to diff");
4998
4999 if (driver->textconv_cache && df->sha1_valid) {
5000 /* ignore errors, as we might be in a readonly repository */
5001 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
5002 size);
5003 /*
5004 * we could save up changes and flush them all at the end,
5005 * but we would need an extra call after all diffing is done.
5006 * Since generating a cache entry is the slow path anyway,
5007 * this extra overhead probably isn't a big deal.
5008 */
5009 notes_cache_write(driver->textconv_cache);
5010 }
5011
5012 return size;
5013 }
5014
5015 void setup_diff_pager(struct diff_options *opt)
5016 {
5017 /*
5018 * If the user asked for our exit code, then either they want --quiet
5019 * or --exit-code. We should definitely not bother with a pager in the
5020 * former case, as we will generate no output. Since we still properly
5021 * report our exit code even when a pager is run, we _could_ run a
5022 * pager with --exit-code. But since we have not done so historically,
5023 * and because it is easy to find people oneline advising "git diff
5024 * --exit-code" in hooks and other scripts, we do not do so.
5025 */
5026 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5027 check_pager_config("diff") != 0)
5028 setup_pager();
5029 }
MinGW port of GIT