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Merge branch 'jc/push-refmap'
[git/gitweb.git] / diff.c
blobb79432b1ec97909e20eb76fceb5530b2f7be647f
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18 #include "string-list.h"
19
20 #ifdef NO_FAST_WORKING_DIRECTORY
21 #define FAST_WORKING_DIRECTORY 0
22 #else
23 #define FAST_WORKING_DIRECTORY 1
24 #endif
25
26 static int diff_detect_rename_default;
27 static int diff_rename_limit_default = 400;
28 static int diff_suppress_blank_empty;
29 static int diff_use_color_default = -1;
30 static int diff_context_default = 3;
31 static const char *diff_word_regex_cfg;
32 static const char *external_diff_cmd_cfg;
33 int diff_auto_refresh_index = 1;
34 static int diff_mnemonic_prefix;
35 static int diff_no_prefix;
36 static int diff_stat_graph_width;
37 static int diff_dirstat_permille_default = 30;
38 static struct diff_options default_diff_options;
39 static long diff_algorithm;
40
41 static char diff_colors[][COLOR_MAXLEN] = {
42 GIT_COLOR_RESET,
43 GIT_COLOR_NORMAL, /* PLAIN */
44 GIT_COLOR_BOLD, /* METAINFO */
45 GIT_COLOR_CYAN, /* FRAGINFO */
46 GIT_COLOR_RED, /* OLD */
47 GIT_COLOR_GREEN, /* NEW */
48 GIT_COLOR_YELLOW, /* COMMIT */
49 GIT_COLOR_BG_RED, /* WHITESPACE */
50 GIT_COLOR_NORMAL, /* FUNCINFO */
51 };
52
53 static int parse_diff_color_slot(const char *var, int ofs)
54 {
55 if (!strcasecmp(var+ofs, "plain"))
56 return DIFF_PLAIN;
57 if (!strcasecmp(var+ofs, "meta"))
58 return DIFF_METAINFO;
59 if (!strcasecmp(var+ofs, "frag"))
60 return DIFF_FRAGINFO;
61 if (!strcasecmp(var+ofs, "old"))
62 return DIFF_FILE_OLD;
63 if (!strcasecmp(var+ofs, "new"))
64 return DIFF_FILE_NEW;
65 if (!strcasecmp(var+ofs, "commit"))
66 return DIFF_COMMIT;
67 if (!strcasecmp(var+ofs, "whitespace"))
68 return DIFF_WHITESPACE;
69 if (!strcasecmp(var+ofs, "func"))
70 return DIFF_FUNCINFO;
71 return -1;
72 }
73
74 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
75 struct strbuf *errmsg)
76 {
77 char *params_copy = xstrdup(params_string);
78 struct string_list params = STRING_LIST_INIT_NODUP;
79 int ret = 0;
80 int i;
81
82 if (*params_copy)
83 string_list_split_in_place(&params, params_copy, ',', -1);
84 for (i = 0; i < params.nr; i++) {
85 const char *p = params.items[i].string;
86 if (!strcmp(p, "changes")) {
87 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
88 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
89 } else if (!strcmp(p, "lines")) {
90 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
91 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
92 } else if (!strcmp(p, "files")) {
93 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
94 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
95 } else if (!strcmp(p, "noncumulative")) {
96 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
97 } else if (!strcmp(p, "cumulative")) {
98 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
99 } else if (isdigit(*p)) {
100 char *end;
101 int permille = strtoul(p, &end, 10) * 10;
102 if (*end == '.' && isdigit(*++end)) {
103 /* only use first digit */
104 permille += *end - '0';
105 /* .. and ignore any further digits */
106 while (isdigit(*++end))
107 ; /* nothing */
108 }
109 if (!*end)
110 options->dirstat_permille = permille;
111 else {
112 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
113 p);
114 ret++;
115 }
116 } else {
117 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
118 ret++;
119 }
120
121 }
122 string_list_clear(&params, 0);
123 free(params_copy);
124 return ret;
125 }
126
127 static int parse_submodule_params(struct diff_options *options, const char *value)
128 {
129 if (!strcmp(value, "log"))
130 DIFF_OPT_SET(options, SUBMODULE_LOG);
131 else if (!strcmp(value, "short"))
132 DIFF_OPT_CLR(options, SUBMODULE_LOG);
133 else
134 return -1;
135 return 0;
136 }
137
138 static int git_config_rename(const char *var, const char *value)
139 {
140 if (!value)
141 return DIFF_DETECT_RENAME;
142 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
143 return DIFF_DETECT_COPY;
144 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
145 }
146
147 long parse_algorithm_value(const char *value)
148 {
149 if (!value)
150 return -1;
151 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
152 return 0;
153 else if (!strcasecmp(value, "minimal"))
154 return XDF_NEED_MINIMAL;
155 else if (!strcasecmp(value, "patience"))
156 return XDF_PATIENCE_DIFF;
157 else if (!strcasecmp(value, "histogram"))
158 return XDF_HISTOGRAM_DIFF;
159 return -1;
160 }
161
162 /*
163 * These are to give UI layer defaults.
164 * The core-level commands such as git-diff-files should
165 * never be affected by the setting of diff.renames
166 * the user happens to have in the configuration file.
167 */
168 int git_diff_ui_config(const char *var, const char *value, void *cb)
169 {
170 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
171 diff_use_color_default = git_config_colorbool(var, value);
172 return 0;
173 }
174 if (!strcmp(var, "diff.context")) {
175 diff_context_default = git_config_int(var, value);
176 if (diff_context_default < 0)
177 return -1;
178 return 0;
179 }
180 if (!strcmp(var, "diff.renames")) {
181 diff_detect_rename_default = git_config_rename(var, value);
182 return 0;
183 }
184 if (!strcmp(var, "diff.autorefreshindex")) {
185 diff_auto_refresh_index = git_config_bool(var, value);
186 return 0;
187 }
188 if (!strcmp(var, "diff.mnemonicprefix")) {
189 diff_mnemonic_prefix = git_config_bool(var, value);
190 return 0;
191 }
192 if (!strcmp(var, "diff.noprefix")) {
193 diff_no_prefix = git_config_bool(var, value);
194 return 0;
195 }
196 if (!strcmp(var, "diff.statgraphwidth")) {
197 diff_stat_graph_width = git_config_int(var, value);
198 return 0;
199 }
200 if (!strcmp(var, "diff.external"))
201 return git_config_string(&external_diff_cmd_cfg, var, value);
202 if (!strcmp(var, "diff.wordregex"))
203 return git_config_string(&diff_word_regex_cfg, var, value);
204
205 if (!strcmp(var, "diff.ignoresubmodules"))
206 handle_ignore_submodules_arg(&default_diff_options, value);
207
208 if (!strcmp(var, "diff.submodule")) {
209 if (parse_submodule_params(&default_diff_options, value))
210 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
211 value);
212 return 0;
213 }
214
215 if (!strcmp(var, "diff.algorithm")) {
216 diff_algorithm = parse_algorithm_value(value);
217 if (diff_algorithm < 0)
218 return -1;
219 return 0;
220 }
221
222 if (git_color_config(var, value, cb) < 0)
223 return -1;
224
225 return git_diff_basic_config(var, value, cb);
226 }
227
228 int git_diff_basic_config(const char *var, const char *value, void *cb)
229 {
230 if (!strcmp(var, "diff.renamelimit")) {
231 diff_rename_limit_default = git_config_int(var, value);
232 return 0;
233 }
234
235 if (userdiff_config(var, value) < 0)
236 return -1;
237
238 if (starts_with(var, "diff.color.") || starts_with(var, "color.diff.")) {
239 int slot = parse_diff_color_slot(var, 11);
240 if (slot < 0)
241 return 0;
242 if (!value)
243 return config_error_nonbool(var);
244 color_parse(value, var, diff_colors[slot]);
245 return 0;
246 }
247
248 /* like GNU diff's --suppress-blank-empty option */
249 if (!strcmp(var, "diff.suppressblankempty") ||
250 /* for backwards compatibility */
251 !strcmp(var, "diff.suppress-blank-empty")) {
252 diff_suppress_blank_empty = git_config_bool(var, value);
253 return 0;
254 }
255
256 if (!strcmp(var, "diff.dirstat")) {
257 struct strbuf errmsg = STRBUF_INIT;
258 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
259 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
260 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
261 errmsg.buf);
262 strbuf_release(&errmsg);
263 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
264 return 0;
265 }
266
267 if (starts_with(var, "submodule."))
268 return parse_submodule_config_option(var, value);
269
270 return git_default_config(var, value, cb);
271 }
272
273 static char *quote_two(const char *one, const char *two)
274 {
275 int need_one = quote_c_style(one, NULL, NULL, 1);
276 int need_two = quote_c_style(two, NULL, NULL, 1);
277 struct strbuf res = STRBUF_INIT;
278
279 if (need_one + need_two) {
280 strbuf_addch(&res, '"');
281 quote_c_style(one, &res, NULL, 1);
282 quote_c_style(two, &res, NULL, 1);
283 strbuf_addch(&res, '"');
284 } else {
285 strbuf_addstr(&res, one);
286 strbuf_addstr(&res, two);
287 }
288 return strbuf_detach(&res, NULL);
289 }
290
291 static const char *external_diff(void)
292 {
293 static const char *external_diff_cmd = NULL;
294 static int done_preparing = 0;
295
296 if (done_preparing)
297 return external_diff_cmd;
298 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
299 if (!external_diff_cmd)
300 external_diff_cmd = external_diff_cmd_cfg;
301 done_preparing = 1;
302 return external_diff_cmd;
303 }
304
305 static struct diff_tempfile {
306 const char *name; /* filename external diff should read from */
307 char hex[41];
308 char mode[10];
309 char tmp_path[PATH_MAX];
310 } diff_temp[2];
311
312 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
313
314 struct emit_callback {
315 int color_diff;
316 unsigned ws_rule;
317 int blank_at_eof_in_preimage;
318 int blank_at_eof_in_postimage;
319 int lno_in_preimage;
320 int lno_in_postimage;
321 sane_truncate_fn truncate;
322 const char **label_path;
323 struct diff_words_data *diff_words;
324 struct diff_options *opt;
325 int *found_changesp;
326 struct strbuf *header;
327 };
328
329 static int count_lines(const char *data, int size)
330 {
331 int count, ch, completely_empty = 1, nl_just_seen = 0;
332 count = 0;
333 while (0 < size--) {
334 ch = *data++;
335 if (ch == '\n') {
336 count++;
337 nl_just_seen = 1;
338 completely_empty = 0;
339 }
340 else {
341 nl_just_seen = 0;
342 completely_empty = 0;
343 }
344 }
345 if (completely_empty)
346 return 0;
347 if (!nl_just_seen)
348 count++; /* no trailing newline */
349 return count;
350 }
351
352 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
353 {
354 if (!DIFF_FILE_VALID(one)) {
355 mf->ptr = (char *)""; /* does not matter */
356 mf->size = 0;
357 return 0;
358 }
359 else if (diff_populate_filespec(one, 0))
360 return -1;
361
362 mf->ptr = one->data;
363 mf->size = one->size;
364 return 0;
365 }
366
367 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
368 static unsigned long diff_filespec_size(struct diff_filespec *one)
369 {
370 if (!DIFF_FILE_VALID(one))
371 return 0;
372 diff_populate_filespec(one, 1);
373 return one->size;
374 }
375
376 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
377 {
378 char *ptr = mf->ptr;
379 long size = mf->size;
380 int cnt = 0;
381
382 if (!size)
383 return cnt;
384 ptr += size - 1; /* pointing at the very end */
385 if (*ptr != '\n')
386 ; /* incomplete line */
387 else
388 ptr--; /* skip the last LF */
389 while (mf->ptr < ptr) {
390 char *prev_eol;
391 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
392 if (*prev_eol == '\n')
393 break;
394 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
395 break;
396 cnt++;
397 ptr = prev_eol - 1;
398 }
399 return cnt;
400 }
401
402 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
403 struct emit_callback *ecbdata)
404 {
405 int l1, l2, at;
406 unsigned ws_rule = ecbdata->ws_rule;
407 l1 = count_trailing_blank(mf1, ws_rule);
408 l2 = count_trailing_blank(mf2, ws_rule);
409 if (l2 <= l1) {
410 ecbdata->blank_at_eof_in_preimage = 0;
411 ecbdata->blank_at_eof_in_postimage = 0;
412 return;
413 }
414 at = count_lines(mf1->ptr, mf1->size);
415 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
416
417 at = count_lines(mf2->ptr, mf2->size);
418 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
419 }
420
421 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
422 int first, const char *line, int len)
423 {
424 int has_trailing_newline, has_trailing_carriage_return;
425 int nofirst;
426 FILE *file = o->file;
427
428 fputs(diff_line_prefix(o), file);
429
430 if (len == 0) {
431 has_trailing_newline = (first == '\n');
432 has_trailing_carriage_return = (!has_trailing_newline &&
433 (first == '\r'));
434 nofirst = has_trailing_newline || has_trailing_carriage_return;
435 } else {
436 has_trailing_newline = (len > 0 && line[len-1] == '\n');
437 if (has_trailing_newline)
438 len--;
439 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
440 if (has_trailing_carriage_return)
441 len--;
442 nofirst = 0;
443 }
444
445 if (len || !nofirst) {
446 fputs(set, file);
447 if (!nofirst)
448 fputc(first, file);
449 fwrite(line, len, 1, file);
450 fputs(reset, file);
451 }
452 if (has_trailing_carriage_return)
453 fputc('\r', file);
454 if (has_trailing_newline)
455 fputc('\n', file);
456 }
457
458 static void emit_line(struct diff_options *o, const char *set, const char *reset,
459 const char *line, int len)
460 {
461 emit_line_0(o, set, reset, line[0], line+1, len-1);
462 }
463
464 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
465 {
466 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
467 ecbdata->blank_at_eof_in_preimage &&
468 ecbdata->blank_at_eof_in_postimage &&
469 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
470 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
471 return 0;
472 return ws_blank_line(line, len, ecbdata->ws_rule);
473 }
474
475 static void emit_add_line(const char *reset,
476 struct emit_callback *ecbdata,
477 const char *line, int len)
478 {
479 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
480 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
481
482 if (!*ws)
483 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
484 else if (new_blank_line_at_eof(ecbdata, line, len))
485 /* Blank line at EOF - paint '+' as well */
486 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
487 else {
488 /* Emit just the prefix, then the rest. */
489 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
490 ws_check_emit(line, len, ecbdata->ws_rule,
491 ecbdata->opt->file, set, reset, ws);
492 }
493 }
494
495 static void emit_hunk_header(struct emit_callback *ecbdata,
496 const char *line, int len)
497 {
498 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
499 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
500 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
501 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
502 static const char atat[2] = { '@', '@' };
503 const char *cp, *ep;
504 struct strbuf msgbuf = STRBUF_INIT;
505 int org_len = len;
506 int i = 1;
507
508 /*
509 * As a hunk header must begin with "@@ -<old>, +<new> @@",
510 * it always is at least 10 bytes long.
511 */
512 if (len < 10 ||
513 memcmp(line, atat, 2) ||
514 !(ep = memmem(line + 2, len - 2, atat, 2))) {
515 emit_line(ecbdata->opt, plain, reset, line, len);
516 return;
517 }
518 ep += 2; /* skip over @@ */
519
520 /* The hunk header in fraginfo color */
521 strbuf_add(&msgbuf, frag, strlen(frag));
522 strbuf_add(&msgbuf, line, ep - line);
523 strbuf_add(&msgbuf, reset, strlen(reset));
524
525 /*
526 * trailing "\r\n"
527 */
528 for ( ; i < 3; i++)
529 if (line[len - i] == '\r' || line[len - i] == '\n')
530 len--;
531
532 /* blank before the func header */
533 for (cp = ep; ep - line < len; ep++)
534 if (*ep != ' ' && *ep != '\t')
535 break;
536 if (ep != cp) {
537 strbuf_add(&msgbuf, plain, strlen(plain));
538 strbuf_add(&msgbuf, cp, ep - cp);
539 strbuf_add(&msgbuf, reset, strlen(reset));
540 }
541
542 if (ep < line + len) {
543 strbuf_add(&msgbuf, func, strlen(func));
544 strbuf_add(&msgbuf, ep, line + len - ep);
545 strbuf_add(&msgbuf, reset, strlen(reset));
546 }
547
548 strbuf_add(&msgbuf, line + len, org_len - len);
549 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
550 strbuf_release(&msgbuf);
551 }
552
553 static struct diff_tempfile *claim_diff_tempfile(void) {
554 int i;
555 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
556 if (!diff_temp[i].name)
557 return diff_temp + i;
558 die("BUG: diff is failing to clean up its tempfiles");
559 }
560
561 static int remove_tempfile_installed;
562
563 static void remove_tempfile(void)
564 {
565 int i;
566 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
567 if (diff_temp[i].name == diff_temp[i].tmp_path)
568 unlink_or_warn(diff_temp[i].name);
569 diff_temp[i].name = NULL;
570 }
571 }
572
573 static void remove_tempfile_on_signal(int signo)
574 {
575 remove_tempfile();
576 sigchain_pop(signo);
577 raise(signo);
578 }
579
580 static void print_line_count(FILE *file, int count)
581 {
582 switch (count) {
583 case 0:
584 fprintf(file, "0,0");
585 break;
586 case 1:
587 fprintf(file, "1");
588 break;
589 default:
590 fprintf(file, "1,%d", count);
591 break;
592 }
593 }
594
595 static void emit_rewrite_lines(struct emit_callback *ecb,
596 int prefix, const char *data, int size)
597 {
598 const char *endp = NULL;
599 static const char *nneof = " No newline at end of file\n";
600 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
601 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
602
603 while (0 < size) {
604 int len;
605
606 endp = memchr(data, '\n', size);
607 len = endp ? (endp - data + 1) : size;
608 if (prefix != '+') {
609 ecb->lno_in_preimage++;
610 emit_line_0(ecb->opt, old, reset, '-',
611 data, len);
612 } else {
613 ecb->lno_in_postimage++;
614 emit_add_line(reset, ecb, data, len);
615 }
616 size -= len;
617 data += len;
618 }
619 if (!endp) {
620 const char *plain = diff_get_color(ecb->color_diff,
621 DIFF_PLAIN);
622 putc('\n', ecb->opt->file);
623 emit_line_0(ecb->opt, plain, reset, '\\',
624 nneof, strlen(nneof));
625 }
626 }
627
628 static void emit_rewrite_diff(const char *name_a,
629 const char *name_b,
630 struct diff_filespec *one,
631 struct diff_filespec *two,
632 struct userdiff_driver *textconv_one,
633 struct userdiff_driver *textconv_two,
634 struct diff_options *o)
635 {
636 int lc_a, lc_b;
637 const char *name_a_tab, *name_b_tab;
638 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
639 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
640 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
641 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
642 const char *a_prefix, *b_prefix;
643 char *data_one, *data_two;
644 size_t size_one, size_two;
645 struct emit_callback ecbdata;
646 const char *line_prefix = diff_line_prefix(o);
647
648 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
649 a_prefix = o->b_prefix;
650 b_prefix = o->a_prefix;
651 } else {
652 a_prefix = o->a_prefix;
653 b_prefix = o->b_prefix;
654 }
655
656 name_a += (*name_a == '/');
657 name_b += (*name_b == '/');
658 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
659 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
660
661 strbuf_reset(&a_name);
662 strbuf_reset(&b_name);
663 quote_two_c_style(&a_name, a_prefix, name_a, 0);
664 quote_two_c_style(&b_name, b_prefix, name_b, 0);
665
666 size_one = fill_textconv(textconv_one, one, &data_one);
667 size_two = fill_textconv(textconv_two, two, &data_two);
668
669 memset(&ecbdata, 0, sizeof(ecbdata));
670 ecbdata.color_diff = want_color(o->use_color);
671 ecbdata.found_changesp = &o->found_changes;
672 ecbdata.ws_rule = whitespace_rule(name_b);
673 ecbdata.opt = o;
674 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
675 mmfile_t mf1, mf2;
676 mf1.ptr = (char *)data_one;
677 mf2.ptr = (char *)data_two;
678 mf1.size = size_one;
679 mf2.size = size_two;
680 check_blank_at_eof(&mf1, &mf2, &ecbdata);
681 }
682 ecbdata.lno_in_preimage = 1;
683 ecbdata.lno_in_postimage = 1;
684
685 lc_a = count_lines(data_one, size_one);
686 lc_b = count_lines(data_two, size_two);
687 fprintf(o->file,
688 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
689 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
690 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
691 line_prefix, fraginfo);
692 if (!o->irreversible_delete)
693 print_line_count(o->file, lc_a);
694 else
695 fprintf(o->file, "?,?");
696 fprintf(o->file, " +");
697 print_line_count(o->file, lc_b);
698 fprintf(o->file, " @@%s\n", reset);
699 if (lc_a && !o->irreversible_delete)
700 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
701 if (lc_b)
702 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
703 if (textconv_one)
704 free((char *)data_one);
705 if (textconv_two)
706 free((char *)data_two);
707 }
708
709 struct diff_words_buffer {
710 mmfile_t text;
711 long alloc;
712 struct diff_words_orig {
713 const char *begin, *end;
714 } *orig;
715 int orig_nr, orig_alloc;
716 };
717
718 static void diff_words_append(char *line, unsigned long len,
719 struct diff_words_buffer *buffer)
720 {
721 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
722 line++;
723 len--;
724 memcpy(buffer->text.ptr + buffer->text.size, line, len);
725 buffer->text.size += len;
726 buffer->text.ptr[buffer->text.size] = '\0';
727 }
728
729 struct diff_words_style_elem {
730 const char *prefix;
731 const char *suffix;
732 const char *color; /* NULL; filled in by the setup code if
733 * color is enabled */
734 };
735
736 struct diff_words_style {
737 enum diff_words_type type;
738 struct diff_words_style_elem new, old, ctx;
739 const char *newline;
740 };
741
742 static struct diff_words_style diff_words_styles[] = {
743 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
744 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
745 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
746 };
747
748 struct diff_words_data {
749 struct diff_words_buffer minus, plus;
750 const char *current_plus;
751 int last_minus;
752 struct diff_options *opt;
753 regex_t *word_regex;
754 enum diff_words_type type;
755 struct diff_words_style *style;
756 };
757
758 static int fn_out_diff_words_write_helper(FILE *fp,
759 struct diff_words_style_elem *st_el,
760 const char *newline,
761 size_t count, const char *buf,
762 const char *line_prefix)
763 {
764 int print = 0;
765
766 while (count) {
767 char *p = memchr(buf, '\n', count);
768 if (print)
769 fputs(line_prefix, fp);
770 if (p != buf) {
771 if (st_el->color && fputs(st_el->color, fp) < 0)
772 return -1;
773 if (fputs(st_el->prefix, fp) < 0 ||
774 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
775 fputs(st_el->suffix, fp) < 0)
776 return -1;
777 if (st_el->color && *st_el->color
778 && fputs(GIT_COLOR_RESET, fp) < 0)
779 return -1;
780 }
781 if (!p)
782 return 0;
783 if (fputs(newline, fp) < 0)
784 return -1;
785 count -= p + 1 - buf;
786 buf = p + 1;
787 print = 1;
788 }
789 return 0;
790 }
791
792 /*
793 * '--color-words' algorithm can be described as:
794 *
795 * 1. collect a the minus/plus lines of a diff hunk, divided into
796 * minus-lines and plus-lines;
797 *
798 * 2. break both minus-lines and plus-lines into words and
799 * place them into two mmfile_t with one word for each line;
800 *
801 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
802 *
803 * And for the common parts of the both file, we output the plus side text.
804 * diff_words->current_plus is used to trace the current position of the plus file
805 * which printed. diff_words->last_minus is used to trace the last minus word
806 * printed.
807 *
808 * For '--graph' to work with '--color-words', we need to output the graph prefix
809 * on each line of color words output. Generally, there are two conditions on
810 * which we should output the prefix.
811 *
812 * 1. diff_words->last_minus == 0 &&
813 * diff_words->current_plus == diff_words->plus.text.ptr
814 *
815 * that is: the plus text must start as a new line, and if there is no minus
816 * word printed, a graph prefix must be printed.
817 *
818 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
819 * *(diff_words->current_plus - 1) == '\n'
820 *
821 * that is: a graph prefix must be printed following a '\n'
822 */
823 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
824 {
825 if ((diff_words->last_minus == 0 &&
826 diff_words->current_plus == diff_words->plus.text.ptr) ||
827 (diff_words->current_plus > diff_words->plus.text.ptr &&
828 *(diff_words->current_plus - 1) == '\n')) {
829 return 1;
830 } else {
831 return 0;
832 }
833 }
834
835 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
836 {
837 struct diff_words_data *diff_words = priv;
838 struct diff_words_style *style = diff_words->style;
839 int minus_first, minus_len, plus_first, plus_len;
840 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
841 struct diff_options *opt = diff_words->opt;
842 const char *line_prefix;
843
844 if (line[0] != '@' || parse_hunk_header(line, len,
845 &minus_first, &minus_len, &plus_first, &plus_len))
846 return;
847
848 assert(opt);
849 line_prefix = diff_line_prefix(opt);
850
851 /* POSIX requires that first be decremented by one if len == 0... */
852 if (minus_len) {
853 minus_begin = diff_words->minus.orig[minus_first].begin;
854 minus_end =
855 diff_words->minus.orig[minus_first + minus_len - 1].end;
856 } else
857 minus_begin = minus_end =
858 diff_words->minus.orig[minus_first].end;
859
860 if (plus_len) {
861 plus_begin = diff_words->plus.orig[plus_first].begin;
862 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
863 } else
864 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
865
866 if (color_words_output_graph_prefix(diff_words)) {
867 fputs(line_prefix, diff_words->opt->file);
868 }
869 if (diff_words->current_plus != plus_begin) {
870 fn_out_diff_words_write_helper(diff_words->opt->file,
871 &style->ctx, style->newline,
872 plus_begin - diff_words->current_plus,
873 diff_words->current_plus, line_prefix);
874 if (*(plus_begin - 1) == '\n')
875 fputs(line_prefix, diff_words->opt->file);
876 }
877 if (minus_begin != minus_end) {
878 fn_out_diff_words_write_helper(diff_words->opt->file,
879 &style->old, style->newline,
880 minus_end - minus_begin, minus_begin,
881 line_prefix);
882 }
883 if (plus_begin != plus_end) {
884 fn_out_diff_words_write_helper(diff_words->opt->file,
885 &style->new, style->newline,
886 plus_end - plus_begin, plus_begin,
887 line_prefix);
888 }
889
890 diff_words->current_plus = plus_end;
891 diff_words->last_minus = minus_first;
892 }
893
894 /* This function starts looking at *begin, and returns 0 iff a word was found. */
895 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
896 int *begin, int *end)
897 {
898 if (word_regex && *begin < buffer->size) {
899 regmatch_t match[1];
900 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
901 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
902 '\n', match[0].rm_eo - match[0].rm_so);
903 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
904 *begin += match[0].rm_so;
905 return *begin >= *end;
906 }
907 return -1;
908 }
909
910 /* find the next word */
911 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
912 (*begin)++;
913 if (*begin >= buffer->size)
914 return -1;
915
916 /* find the end of the word */
917 *end = *begin + 1;
918 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
919 (*end)++;
920
921 return 0;
922 }
923
924 /*
925 * This function splits the words in buffer->text, stores the list with
926 * newline separator into out, and saves the offsets of the original words
927 * in buffer->orig.
928 */
929 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
930 regex_t *word_regex)
931 {
932 int i, j;
933 long alloc = 0;
934
935 out->size = 0;
936 out->ptr = NULL;
937
938 /* fake an empty "0th" word */
939 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
940 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
941 buffer->orig_nr = 1;
942
943 for (i = 0; i < buffer->text.size; i++) {
944 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
945 return;
946
947 /* store original boundaries */
948 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
949 buffer->orig_alloc);
950 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
951 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
952 buffer->orig_nr++;
953
954 /* store one word */
955 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
956 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
957 out->ptr[out->size + j - i] = '\n';
958 out->size += j - i + 1;
959
960 i = j - 1;
961 }
962 }
963
964 /* this executes the word diff on the accumulated buffers */
965 static void diff_words_show(struct diff_words_data *diff_words)
966 {
967 xpparam_t xpp;
968 xdemitconf_t xecfg;
969 mmfile_t minus, plus;
970 struct diff_words_style *style = diff_words->style;
971
972 struct diff_options *opt = diff_words->opt;
973 const char *line_prefix;
974
975 assert(opt);
976 line_prefix = diff_line_prefix(opt);
977
978 /* special case: only removal */
979 if (!diff_words->plus.text.size) {
980 fputs(line_prefix, diff_words->opt->file);
981 fn_out_diff_words_write_helper(diff_words->opt->file,
982 &style->old, style->newline,
983 diff_words->minus.text.size,
984 diff_words->minus.text.ptr, line_prefix);
985 diff_words->minus.text.size = 0;
986 return;
987 }
988
989 diff_words->current_plus = diff_words->plus.text.ptr;
990 diff_words->last_minus = 0;
991
992 memset(&xpp, 0, sizeof(xpp));
993 memset(&xecfg, 0, sizeof(xecfg));
994 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
995 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
996 xpp.flags = 0;
997 /* as only the hunk header will be parsed, we need a 0-context */
998 xecfg.ctxlen = 0;
999 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1000 &xpp, &xecfg);
1001 free(minus.ptr);
1002 free(plus.ptr);
1003 if (diff_words->current_plus != diff_words->plus.text.ptr +
1004 diff_words->plus.text.size) {
1005 if (color_words_output_graph_prefix(diff_words))
1006 fputs(line_prefix, diff_words->opt->file);
1007 fn_out_diff_words_write_helper(diff_words->opt->file,
1008 &style->ctx, style->newline,
1009 diff_words->plus.text.ptr + diff_words->plus.text.size
1010 - diff_words->current_plus, diff_words->current_plus,
1011 line_prefix);
1012 }
1013 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1014 }
1015
1016 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1017 static void diff_words_flush(struct emit_callback *ecbdata)
1018 {
1019 if (ecbdata->diff_words->minus.text.size ||
1020 ecbdata->diff_words->plus.text.size)
1021 diff_words_show(ecbdata->diff_words);
1022 }
1023
1024 static void diff_filespec_load_driver(struct diff_filespec *one)
1025 {
1026 /* Use already-loaded driver */
1027 if (one->driver)
1028 return;
1029
1030 if (S_ISREG(one->mode))
1031 one->driver = userdiff_find_by_path(one->path);
1032
1033 /* Fallback to default settings */
1034 if (!one->driver)
1035 one->driver = userdiff_find_by_name("default");
1036 }
1037
1038 static const char *userdiff_word_regex(struct diff_filespec *one)
1039 {
1040 diff_filespec_load_driver(one);
1041 return one->driver->word_regex;
1042 }
1043
1044 static void init_diff_words_data(struct emit_callback *ecbdata,
1045 struct diff_options *orig_opts,
1046 struct diff_filespec *one,
1047 struct diff_filespec *two)
1048 {
1049 int i;
1050 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1051 memcpy(o, orig_opts, sizeof(struct diff_options));
1052
1053 ecbdata->diff_words =
1054 xcalloc(1, sizeof(struct diff_words_data));
1055 ecbdata->diff_words->type = o->word_diff;
1056 ecbdata->diff_words->opt = o;
1057 if (!o->word_regex)
1058 o->word_regex = userdiff_word_regex(one);
1059 if (!o->word_regex)
1060 o->word_regex = userdiff_word_regex(two);
1061 if (!o->word_regex)
1062 o->word_regex = diff_word_regex_cfg;
1063 if (o->word_regex) {
1064 ecbdata->diff_words->word_regex = (regex_t *)
1065 xmalloc(sizeof(regex_t));
1066 if (regcomp(ecbdata->diff_words->word_regex,
1067 o->word_regex,
1068 REG_EXTENDED | REG_NEWLINE))
1069 die ("Invalid regular expression: %s",
1070 o->word_regex);
1071 }
1072 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1073 if (o->word_diff == diff_words_styles[i].type) {
1074 ecbdata->diff_words->style =
1075 &diff_words_styles[i];
1076 break;
1077 }
1078 }
1079 if (want_color(o->use_color)) {
1080 struct diff_words_style *st = ecbdata->diff_words->style;
1081 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1082 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1083 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1084 }
1085 }
1086
1087 static void free_diff_words_data(struct emit_callback *ecbdata)
1088 {
1089 if (ecbdata->diff_words) {
1090 diff_words_flush(ecbdata);
1091 free (ecbdata->diff_words->opt);
1092 free (ecbdata->diff_words->minus.text.ptr);
1093 free (ecbdata->diff_words->minus.orig);
1094 free (ecbdata->diff_words->plus.text.ptr);
1095 free (ecbdata->diff_words->plus.orig);
1096 if (ecbdata->diff_words->word_regex) {
1097 regfree(ecbdata->diff_words->word_regex);
1098 free(ecbdata->diff_words->word_regex);
1099 }
1100 free(ecbdata->diff_words);
1101 ecbdata->diff_words = NULL;
1102 }
1103 }
1104
1105 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1106 {
1107 if (want_color(diff_use_color))
1108 return diff_colors[ix];
1109 return "";
1110 }
1111
1112 const char *diff_line_prefix(struct diff_options *opt)
1113 {
1114 struct strbuf *msgbuf;
1115 if (!opt->output_prefix)
1116 return "";
1117
1118 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1119 return msgbuf->buf;
1120 }
1121
1122 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1123 {
1124 const char *cp;
1125 unsigned long allot;
1126 size_t l = len;
1127
1128 if (ecb->truncate)
1129 return ecb->truncate(line, len);
1130 cp = line;
1131 allot = l;
1132 while (0 < l) {
1133 (void) utf8_width(&cp, &l);
1134 if (!cp)
1135 break; /* truncated in the middle? */
1136 }
1137 return allot - l;
1138 }
1139
1140 static void find_lno(const char *line, struct emit_callback *ecbdata)
1141 {
1142 const char *p;
1143 ecbdata->lno_in_preimage = 0;
1144 ecbdata->lno_in_postimage = 0;
1145 p = strchr(line, '-');
1146 if (!p)
1147 return; /* cannot happen */
1148 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1149 p = strchr(p, '+');
1150 if (!p)
1151 return; /* cannot happen */
1152 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1153 }
1154
1155 static void fn_out_consume(void *priv, char *line, unsigned long len)
1156 {
1157 struct emit_callback *ecbdata = priv;
1158 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1159 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1160 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1161 struct diff_options *o = ecbdata->opt;
1162 const char *line_prefix = diff_line_prefix(o);
1163
1164 if (ecbdata->header) {
1165 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1166 strbuf_reset(ecbdata->header);
1167 ecbdata->header = NULL;
1168 }
1169 *(ecbdata->found_changesp) = 1;
1170
1171 if (ecbdata->label_path[0]) {
1172 const char *name_a_tab, *name_b_tab;
1173
1174 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1175 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1176
1177 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1178 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1179 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1180 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1181 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1182 }
1183
1184 if (diff_suppress_blank_empty
1185 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1186 line[0] = '\n';
1187 len = 1;
1188 }
1189
1190 if (line[0] == '@') {
1191 if (ecbdata->diff_words)
1192 diff_words_flush(ecbdata);
1193 len = sane_truncate_line(ecbdata, line, len);
1194 find_lno(line, ecbdata);
1195 emit_hunk_header(ecbdata, line, len);
1196 if (line[len-1] != '\n')
1197 putc('\n', ecbdata->opt->file);
1198 return;
1199 }
1200
1201 if (len < 1) {
1202 emit_line(ecbdata->opt, reset, reset, line, len);
1203 if (ecbdata->diff_words
1204 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1205 fputs("~\n", ecbdata->opt->file);
1206 return;
1207 }
1208
1209 if (ecbdata->diff_words) {
1210 if (line[0] == '-') {
1211 diff_words_append(line, len,
1212 &ecbdata->diff_words->minus);
1213 return;
1214 } else if (line[0] == '+') {
1215 diff_words_append(line, len,
1216 &ecbdata->diff_words->plus);
1217 return;
1218 } else if (starts_with(line, "\\ ")) {
1219 /*
1220 * Eat the "no newline at eof" marker as if we
1221 * saw a "+" or "-" line with nothing on it,
1222 * and return without diff_words_flush() to
1223 * defer processing. If this is the end of
1224 * preimage, more "+" lines may come after it.
1225 */
1226 return;
1227 }
1228 diff_words_flush(ecbdata);
1229 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1230 emit_line(ecbdata->opt, plain, reset, line, len);
1231 fputs("~\n", ecbdata->opt->file);
1232 } else {
1233 /*
1234 * Skip the prefix character, if any. With
1235 * diff_suppress_blank_empty, there may be
1236 * none.
1237 */
1238 if (line[0] != '\n') {
1239 line++;
1240 len--;
1241 }
1242 emit_line(ecbdata->opt, plain, reset, line, len);
1243 }
1244 return;
1245 }
1246
1247 if (line[0] != '+') {
1248 const char *color =
1249 diff_get_color(ecbdata->color_diff,
1250 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1251 ecbdata->lno_in_preimage++;
1252 if (line[0] == ' ')
1253 ecbdata->lno_in_postimage++;
1254 emit_line(ecbdata->opt, color, reset, line, len);
1255 } else {
1256 ecbdata->lno_in_postimage++;
1257 emit_add_line(reset, ecbdata, line + 1, len - 1);
1258 }
1259 }
1260
1261 static char *pprint_rename(const char *a, const char *b)
1262 {
1263 const char *old = a;
1264 const char *new = b;
1265 struct strbuf name = STRBUF_INIT;
1266 int pfx_length, sfx_length;
1267 int pfx_adjust_for_slash;
1268 int len_a = strlen(a);
1269 int len_b = strlen(b);
1270 int a_midlen, b_midlen;
1271 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1272 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1273
1274 if (qlen_a || qlen_b) {
1275 quote_c_style(a, &name, NULL, 0);
1276 strbuf_addstr(&name, " => ");
1277 quote_c_style(b, &name, NULL, 0);
1278 return strbuf_detach(&name, NULL);
1279 }
1280
1281 /* Find common prefix */
1282 pfx_length = 0;
1283 while (*old && *new && *old == *new) {
1284 if (*old == '/')
1285 pfx_length = old - a + 1;
1286 old++;
1287 new++;
1288 }
1289
1290 /* Find common suffix */
1291 old = a + len_a;
1292 new = b + len_b;
1293 sfx_length = 0;
1294 /*
1295 * If there is a common prefix, it must end in a slash. In
1296 * that case we let this loop run 1 into the prefix to see the
1297 * same slash.
1298 *
1299 * If there is no common prefix, we cannot do this as it would
1300 * underrun the input strings.
1301 */
1302 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1303 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1304 b + pfx_length - pfx_adjust_for_slash <= new &&
1305 *old == *new) {
1306 if (*old == '/')
1307 sfx_length = len_a - (old - a);
1308 old--;
1309 new--;
1310 }
1311
1312 /*
1313 * pfx{mid-a => mid-b}sfx
1314 * {pfx-a => pfx-b}sfx
1315 * pfx{sfx-a => sfx-b}
1316 * name-a => name-b
1317 */
1318 a_midlen = len_a - pfx_length - sfx_length;
1319 b_midlen = len_b - pfx_length - sfx_length;
1320 if (a_midlen < 0)
1321 a_midlen = 0;
1322 if (b_midlen < 0)
1323 b_midlen = 0;
1324
1325 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1326 if (pfx_length + sfx_length) {
1327 strbuf_add(&name, a, pfx_length);
1328 strbuf_addch(&name, '{');
1329 }
1330 strbuf_add(&name, a + pfx_length, a_midlen);
1331 strbuf_addstr(&name, " => ");
1332 strbuf_add(&name, b + pfx_length, b_midlen);
1333 if (pfx_length + sfx_length) {
1334 strbuf_addch(&name, '}');
1335 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1336 }
1337 return strbuf_detach(&name, NULL);
1338 }
1339
1340 struct diffstat_t {
1341 int nr;
1342 int alloc;
1343 struct diffstat_file {
1344 char *from_name;
1345 char *name;
1346 char *print_name;
1347 unsigned is_unmerged:1;
1348 unsigned is_binary:1;
1349 unsigned is_renamed:1;
1350 unsigned is_interesting:1;
1351 uintmax_t added, deleted;
1352 } **files;
1353 };
1354
1355 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1356 const char *name_a,
1357 const char *name_b)
1358 {
1359 struct diffstat_file *x;
1360 x = xcalloc(sizeof (*x), 1);
1361 if (diffstat->nr == diffstat->alloc) {
1362 diffstat->alloc = alloc_nr(diffstat->alloc);
1363 diffstat->files = xrealloc(diffstat->files,
1364 diffstat->alloc * sizeof(x));
1365 }
1366 diffstat->files[diffstat->nr++] = x;
1367 if (name_b) {
1368 x->from_name = xstrdup(name_a);
1369 x->name = xstrdup(name_b);
1370 x->is_renamed = 1;
1371 }
1372 else {
1373 x->from_name = NULL;
1374 x->name = xstrdup(name_a);
1375 }
1376 return x;
1377 }
1378
1379 static void diffstat_consume(void *priv, char *line, unsigned long len)
1380 {
1381 struct diffstat_t *diffstat = priv;
1382 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1383
1384 if (line[0] == '+')
1385 x->added++;
1386 else if (line[0] == '-')
1387 x->deleted++;
1388 }
1389
1390 const char mime_boundary_leader[] = "------------";
1391
1392 static int scale_linear(int it, int width, int max_change)
1393 {
1394 if (!it)
1395 return 0;
1396 /*
1397 * make sure that at least one '-' or '+' is printed if
1398 * there is any change to this path. The easiest way is to
1399 * scale linearly as if the alloted width is one column shorter
1400 * than it is, and then add 1 to the result.
1401 */
1402 return 1 + (it * (width - 1) / max_change);
1403 }
1404
1405 static void show_name(FILE *file,
1406 const char *prefix, const char *name, int len)
1407 {
1408 fprintf(file, " %s%-*s |", prefix, len, name);
1409 }
1410
1411 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1412 {
1413 if (cnt <= 0)
1414 return;
1415 fprintf(file, "%s", set);
1416 while (cnt--)
1417 putc(ch, file);
1418 fprintf(file, "%s", reset);
1419 }
1420
1421 static void fill_print_name(struct diffstat_file *file)
1422 {
1423 char *pname;
1424
1425 if (file->print_name)
1426 return;
1427
1428 if (!file->is_renamed) {
1429 struct strbuf buf = STRBUF_INIT;
1430 if (quote_c_style(file->name, &buf, NULL, 0)) {
1431 pname = strbuf_detach(&buf, NULL);
1432 } else {
1433 pname = file->name;
1434 strbuf_release(&buf);
1435 }
1436 } else {
1437 pname = pprint_rename(file->from_name, file->name);
1438 }
1439 file->print_name = pname;
1440 }
1441
1442 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1443 {
1444 struct strbuf sb = STRBUF_INIT;
1445 int ret;
1446
1447 if (!files) {
1448 assert(insertions == 0 && deletions == 0);
1449 return fprintf(fp, "%s\n", " 0 files changed");
1450 }
1451
1452 strbuf_addf(&sb,
1453 (files == 1) ? " %d file changed" : " %d files changed",
1454 files);
1455
1456 /*
1457 * For binary diff, the caller may want to print "x files
1458 * changed" with insertions == 0 && deletions == 0.
1459 *
1460 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1461 * is probably less confusing (i.e skip over "2 files changed
1462 * but nothing about added/removed lines? Is this a bug in Git?").
1463 */
1464 if (insertions || deletions == 0) {
1465 /*
1466 * TRANSLATORS: "+" in (+) is a line addition marker;
1467 * do not translate it.
1468 */
1469 strbuf_addf(&sb,
1470 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1471 insertions);
1472 }
1473
1474 if (deletions || insertions == 0) {
1475 /*
1476 * TRANSLATORS: "-" in (-) is a line removal marker;
1477 * do not translate it.
1478 */
1479 strbuf_addf(&sb,
1480 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1481 deletions);
1482 }
1483 strbuf_addch(&sb, '\n');
1484 ret = fputs(sb.buf, fp);
1485 strbuf_release(&sb);
1486 return ret;
1487 }
1488
1489 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1490 {
1491 int i, len, add, del, adds = 0, dels = 0;
1492 uintmax_t max_change = 0, max_len = 0;
1493 int total_files = data->nr, count;
1494 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1495 const char *reset, *add_c, *del_c;
1496 const char *line_prefix = "";
1497 int extra_shown = 0;
1498
1499 if (data->nr == 0)
1500 return;
1501
1502 line_prefix = diff_line_prefix(options);
1503 count = options->stat_count ? options->stat_count : data->nr;
1504
1505 reset = diff_get_color_opt(options, DIFF_RESET);
1506 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1507 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1508
1509 /*
1510 * Find the longest filename and max number of changes
1511 */
1512 for (i = 0; (i < count) && (i < data->nr); i++) {
1513 struct diffstat_file *file = data->files[i];
1514 uintmax_t change = file->added + file->deleted;
1515
1516 if (!file->is_interesting && (change == 0)) {
1517 count++; /* not shown == room for one more */
1518 continue;
1519 }
1520 fill_print_name(file);
1521 len = strlen(file->print_name);
1522 if (max_len < len)
1523 max_len = len;
1524
1525 if (file->is_unmerged) {
1526 /* "Unmerged" is 8 characters */
1527 bin_width = bin_width < 8 ? 8 : bin_width;
1528 continue;
1529 }
1530 if (file->is_binary) {
1531 /* "Bin XXX -> YYY bytes" */
1532 int w = 14 + decimal_width(file->added)
1533 + decimal_width(file->deleted);
1534 bin_width = bin_width < w ? w : bin_width;
1535 /* Display change counts aligned with "Bin" */
1536 number_width = 3;
1537 continue;
1538 }
1539
1540 if (max_change < change)
1541 max_change = change;
1542 }
1543 count = i; /* where we can stop scanning in data->files[] */
1544
1545 /*
1546 * We have width = stat_width or term_columns() columns total.
1547 * We want a maximum of min(max_len, stat_name_width) for the name part.
1548 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1549 * We also need 1 for " " and 4 + decimal_width(max_change)
1550 * for " | NNNN " and one the empty column at the end, altogether
1551 * 6 + decimal_width(max_change).
1552 *
1553 * If there's not enough space, we will use the smaller of
1554 * stat_name_width (if set) and 5/8*width for the filename,
1555 * and the rest for constant elements + graph part, but no more
1556 * than stat_graph_width for the graph part.
1557 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1558 * for the standard terminal size).
1559 *
1560 * In other words: stat_width limits the maximum width, and
1561 * stat_name_width fixes the maximum width of the filename,
1562 * and is also used to divide available columns if there
1563 * aren't enough.
1564 *
1565 * Binary files are displayed with "Bin XXX -> YYY bytes"
1566 * instead of the change count and graph. This part is treated
1567 * similarly to the graph part, except that it is not
1568 * "scaled". If total width is too small to accommodate the
1569 * guaranteed minimum width of the filename part and the
1570 * separators and this message, this message will "overflow"
1571 * making the line longer than the maximum width.
1572 */
1573
1574 if (options->stat_width == -1)
1575 width = term_columns() - options->output_prefix_length;
1576 else
1577 width = options->stat_width ? options->stat_width : 80;
1578 number_width = decimal_width(max_change) > number_width ?
1579 decimal_width(max_change) : number_width;
1580
1581 if (options->stat_graph_width == -1)
1582 options->stat_graph_width = diff_stat_graph_width;
1583
1584 /*
1585 * Guarantee 3/8*16==6 for the graph part
1586 * and 5/8*16==10 for the filename part
1587 */
1588 if (width < 16 + 6 + number_width)
1589 width = 16 + 6 + number_width;
1590
1591 /*
1592 * First assign sizes that are wanted, ignoring available width.
1593 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1594 * starting from "XXX" should fit in graph_width.
1595 */
1596 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1597 if (options->stat_graph_width &&
1598 options->stat_graph_width < graph_width)
1599 graph_width = options->stat_graph_width;
1600
1601 name_width = (options->stat_name_width > 0 &&
1602 options->stat_name_width < max_len) ?
1603 options->stat_name_width : max_len;
1604
1605 /*
1606 * Adjust adjustable widths not to exceed maximum width
1607 */
1608 if (name_width + number_width + 6 + graph_width > width) {
1609 if (graph_width > width * 3/8 - number_width - 6) {
1610 graph_width = width * 3/8 - number_width - 6;
1611 if (graph_width < 6)
1612 graph_width = 6;
1613 }
1614
1615 if (options->stat_graph_width &&
1616 graph_width > options->stat_graph_width)
1617 graph_width = options->stat_graph_width;
1618 if (name_width > width - number_width - 6 - graph_width)
1619 name_width = width - number_width - 6 - graph_width;
1620 else
1621 graph_width = width - number_width - 6 - name_width;
1622 }
1623
1624 /*
1625 * From here name_width is the width of the name area,
1626 * and graph_width is the width of the graph area.
1627 * max_change is used to scale graph properly.
1628 */
1629 for (i = 0; i < count; i++) {
1630 const char *prefix = "";
1631 struct diffstat_file *file = data->files[i];
1632 char *name = file->print_name;
1633 uintmax_t added = file->added;
1634 uintmax_t deleted = file->deleted;
1635 int name_len;
1636
1637 if (!file->is_interesting && (added + deleted == 0))
1638 continue;
1639
1640 /*
1641 * "scale" the filename
1642 */
1643 len = name_width;
1644 name_len = strlen(name);
1645 if (name_width < name_len) {
1646 char *slash;
1647 prefix = "...";
1648 len -= 3;
1649 name += name_len - len;
1650 slash = strchr(name, '/');
1651 if (slash)
1652 name = slash;
1653 }
1654
1655 if (file->is_binary) {
1656 fprintf(options->file, "%s", line_prefix);
1657 show_name(options->file, prefix, name, len);
1658 fprintf(options->file, " %*s", number_width, "Bin");
1659 if (!added && !deleted) {
1660 putc('\n', options->file);
1661 continue;
1662 }
1663 fprintf(options->file, " %s%"PRIuMAX"%s",
1664 del_c, deleted, reset);
1665 fprintf(options->file, " -> ");
1666 fprintf(options->file, "%s%"PRIuMAX"%s",
1667 add_c, added, reset);
1668 fprintf(options->file, " bytes");
1669 fprintf(options->file, "\n");
1670 continue;
1671 }
1672 else if (file->is_unmerged) {
1673 fprintf(options->file, "%s", line_prefix);
1674 show_name(options->file, prefix, name, len);
1675 fprintf(options->file, " Unmerged\n");
1676 continue;
1677 }
1678
1679 /*
1680 * scale the add/delete
1681 */
1682 add = added;
1683 del = deleted;
1684
1685 if (graph_width <= max_change) {
1686 int total = scale_linear(add + del, graph_width, max_change);
1687 if (total < 2 && add && del)
1688 /* width >= 2 due to the sanity check */
1689 total = 2;
1690 if (add < del) {
1691 add = scale_linear(add, graph_width, max_change);
1692 del = total - add;
1693 } else {
1694 del = scale_linear(del, graph_width, max_change);
1695 add = total - del;
1696 }
1697 }
1698 fprintf(options->file, "%s", line_prefix);
1699 show_name(options->file, prefix, name, len);
1700 fprintf(options->file, " %*"PRIuMAX"%s",
1701 number_width, added + deleted,
1702 added + deleted ? " " : "");
1703 show_graph(options->file, '+', add, add_c, reset);
1704 show_graph(options->file, '-', del, del_c, reset);
1705 fprintf(options->file, "\n");
1706 }
1707
1708 for (i = 0; i < data->nr; i++) {
1709 struct diffstat_file *file = data->files[i];
1710 uintmax_t added = file->added;
1711 uintmax_t deleted = file->deleted;
1712
1713 if (file->is_unmerged ||
1714 (!file->is_interesting && (added + deleted == 0))) {
1715 total_files--;
1716 continue;
1717 }
1718
1719 if (!file->is_binary) {
1720 adds += added;
1721 dels += deleted;
1722 }
1723 if (i < count)
1724 continue;
1725 if (!extra_shown)
1726 fprintf(options->file, "%s ...\n", line_prefix);
1727 extra_shown = 1;
1728 }
1729 fprintf(options->file, "%s", line_prefix);
1730 print_stat_summary(options->file, total_files, adds, dels);
1731 }
1732
1733 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1734 {
1735 int i, adds = 0, dels = 0, total_files = data->nr;
1736
1737 if (data->nr == 0)
1738 return;
1739
1740 for (i = 0; i < data->nr; i++) {
1741 int added = data->files[i]->added;
1742 int deleted= data->files[i]->deleted;
1743
1744 if (data->files[i]->is_unmerged ||
1745 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1746 total_files--;
1747 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1748 adds += added;
1749 dels += deleted;
1750 }
1751 }
1752 fprintf(options->file, "%s", diff_line_prefix(options));
1753 print_stat_summary(options->file, total_files, adds, dels);
1754 }
1755
1756 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1757 {
1758 int i;
1759
1760 if (data->nr == 0)
1761 return;
1762
1763 for (i = 0; i < data->nr; i++) {
1764 struct diffstat_file *file = data->files[i];
1765
1766 fprintf(options->file, "%s", diff_line_prefix(options));
1767
1768 if (file->is_binary)
1769 fprintf(options->file, "-\t-\t");
1770 else
1771 fprintf(options->file,
1772 "%"PRIuMAX"\t%"PRIuMAX"\t",
1773 file->added, file->deleted);
1774 if (options->line_termination) {
1775 fill_print_name(file);
1776 if (!file->is_renamed)
1777 write_name_quoted(file->name, options->file,
1778 options->line_termination);
1779 else {
1780 fputs(file->print_name, options->file);
1781 putc(options->line_termination, options->file);
1782 }
1783 } else {
1784 if (file->is_renamed) {
1785 putc('\0', options->file);
1786 write_name_quoted(file->from_name, options->file, '\0');
1787 }
1788 write_name_quoted(file->name, options->file, '\0');
1789 }
1790 }
1791 }
1792
1793 struct dirstat_file {
1794 const char *name;
1795 unsigned long changed;
1796 };
1797
1798 struct dirstat_dir {
1799 struct dirstat_file *files;
1800 int alloc, nr, permille, cumulative;
1801 };
1802
1803 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1804 unsigned long changed, const char *base, int baselen)
1805 {
1806 unsigned long this_dir = 0;
1807 unsigned int sources = 0;
1808 const char *line_prefix = diff_line_prefix(opt);
1809
1810 while (dir->nr) {
1811 struct dirstat_file *f = dir->files;
1812 int namelen = strlen(f->name);
1813 unsigned long this;
1814 char *slash;
1815
1816 if (namelen < baselen)
1817 break;
1818 if (memcmp(f->name, base, baselen))
1819 break;
1820 slash = strchr(f->name + baselen, '/');
1821 if (slash) {
1822 int newbaselen = slash + 1 - f->name;
1823 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1824 sources++;
1825 } else {
1826 this = f->changed;
1827 dir->files++;
1828 dir->nr--;
1829 sources += 2;
1830 }
1831 this_dir += this;
1832 }
1833
1834 /*
1835 * We don't report dirstat's for
1836 * - the top level
1837 * - or cases where everything came from a single directory
1838 * under this directory (sources == 1).
1839 */
1840 if (baselen && sources != 1) {
1841 if (this_dir) {
1842 int permille = this_dir * 1000 / changed;
1843 if (permille >= dir->permille) {
1844 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1845 permille / 10, permille % 10, baselen, base);
1846 if (!dir->cumulative)
1847 return 0;
1848 }
1849 }
1850 }
1851 return this_dir;
1852 }
1853
1854 static int dirstat_compare(const void *_a, const void *_b)
1855 {
1856 const struct dirstat_file *a = _a;
1857 const struct dirstat_file *b = _b;
1858 return strcmp(a->name, b->name);
1859 }
1860
1861 static void show_dirstat(struct diff_options *options)
1862 {
1863 int i;
1864 unsigned long changed;
1865 struct dirstat_dir dir;
1866 struct diff_queue_struct *q = &diff_queued_diff;
1867
1868 dir.files = NULL;
1869 dir.alloc = 0;
1870 dir.nr = 0;
1871 dir.permille = options->dirstat_permille;
1872 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1873
1874 changed = 0;
1875 for (i = 0; i < q->nr; i++) {
1876 struct diff_filepair *p = q->queue[i];
1877 const char *name;
1878 unsigned long copied, added, damage;
1879 int content_changed;
1880
1881 name = p->two->path ? p->two->path : p->one->path;
1882
1883 if (p->one->sha1_valid && p->two->sha1_valid)
1884 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1885 else
1886 content_changed = 1;
1887
1888 if (!content_changed) {
1889 /*
1890 * The SHA1 has not changed, so pre-/post-content is
1891 * identical. We can therefore skip looking at the
1892 * file contents altogether.
1893 */
1894 damage = 0;
1895 goto found_damage;
1896 }
1897
1898 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1899 /*
1900 * In --dirstat-by-file mode, we don't really need to
1901 * look at the actual file contents at all.
1902 * The fact that the SHA1 changed is enough for us to
1903 * add this file to the list of results
1904 * (with each file contributing equal damage).
1905 */
1906 damage = 1;
1907 goto found_damage;
1908 }
1909
1910 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1911 diff_populate_filespec(p->one, 0);
1912 diff_populate_filespec(p->two, 0);
1913 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1914 &copied, &added);
1915 diff_free_filespec_data(p->one);
1916 diff_free_filespec_data(p->two);
1917 } else if (DIFF_FILE_VALID(p->one)) {
1918 diff_populate_filespec(p->one, 1);
1919 copied = added = 0;
1920 diff_free_filespec_data(p->one);
1921 } else if (DIFF_FILE_VALID(p->two)) {
1922 diff_populate_filespec(p->two, 1);
1923 copied = 0;
1924 added = p->two->size;
1925 diff_free_filespec_data(p->two);
1926 } else
1927 continue;
1928
1929 /*
1930 * Original minus copied is the removed material,
1931 * added is the new material. They are both damages
1932 * made to the preimage.
1933 * If the resulting damage is zero, we know that
1934 * diffcore_count_changes() considers the two entries to
1935 * be identical, but since content_changed is true, we
1936 * know that there must have been _some_ kind of change,
1937 * so we force all entries to have damage > 0.
1938 */
1939 damage = (p->one->size - copied) + added;
1940 if (!damage)
1941 damage = 1;
1942
1943 found_damage:
1944 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1945 dir.files[dir.nr].name = name;
1946 dir.files[dir.nr].changed = damage;
1947 changed += damage;
1948 dir.nr++;
1949 }
1950
1951 /* This can happen even with many files, if everything was renames */
1952 if (!changed)
1953 return;
1954
1955 /* Show all directories with more than x% of the changes */
1956 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1957 gather_dirstat(options, &dir, changed, "", 0);
1958 }
1959
1960 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1961 {
1962 int i;
1963 unsigned long changed;
1964 struct dirstat_dir dir;
1965
1966 if (data->nr == 0)
1967 return;
1968
1969 dir.files = NULL;
1970 dir.alloc = 0;
1971 dir.nr = 0;
1972 dir.permille = options->dirstat_permille;
1973 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1974
1975 changed = 0;
1976 for (i = 0; i < data->nr; i++) {
1977 struct diffstat_file *file = data->files[i];
1978 unsigned long damage = file->added + file->deleted;
1979 if (file->is_binary)
1980 /*
1981 * binary files counts bytes, not lines. Must find some
1982 * way to normalize binary bytes vs. textual lines.
1983 * The following heuristic assumes that there are 64
1984 * bytes per "line".
1985 * This is stupid and ugly, but very cheap...
1986 */
1987 damage = (damage + 63) / 64;
1988 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1989 dir.files[dir.nr].name = file->name;
1990 dir.files[dir.nr].changed = damage;
1991 changed += damage;
1992 dir.nr++;
1993 }
1994
1995 /* This can happen even with many files, if everything was renames */
1996 if (!changed)
1997 return;
1998
1999 /* Show all directories with more than x% of the changes */
2000 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2001 gather_dirstat(options, &dir, changed, "", 0);
2002 }
2003
2004 static void free_diffstat_info(struct diffstat_t *diffstat)
2005 {
2006 int i;
2007 for (i = 0; i < diffstat->nr; i++) {
2008 struct diffstat_file *f = diffstat->files[i];
2009 if (f->name != f->print_name)
2010 free(f->print_name);
2011 free(f->name);
2012 free(f->from_name);
2013 free(f);
2014 }
2015 free(diffstat->files);
2016 }
2017
2018 struct checkdiff_t {
2019 const char *filename;
2020 int lineno;
2021 int conflict_marker_size;
2022 struct diff_options *o;
2023 unsigned ws_rule;
2024 unsigned status;
2025 };
2026
2027 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2028 {
2029 char firstchar;
2030 int cnt;
2031
2032 if (len < marker_size + 1)
2033 return 0;
2034 firstchar = line[0];
2035 switch (firstchar) {
2036 case '=': case '>': case '<': case '|':
2037 break;
2038 default:
2039 return 0;
2040 }
2041 for (cnt = 1; cnt < marker_size; cnt++)
2042 if (line[cnt] != firstchar)
2043 return 0;
2044 /* line[1] thru line[marker_size-1] are same as firstchar */
2045 if (len < marker_size + 1 || !isspace(line[marker_size]))
2046 return 0;
2047 return 1;
2048 }
2049
2050 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2051 {
2052 struct checkdiff_t *data = priv;
2053 int marker_size = data->conflict_marker_size;
2054 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2055 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2056 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2057 char *err;
2058 const char *line_prefix;
2059
2060 assert(data->o);
2061 line_prefix = diff_line_prefix(data->o);
2062
2063 if (line[0] == '+') {
2064 unsigned bad;
2065 data->lineno++;
2066 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2067 data->status |= 1;
2068 fprintf(data->o->file,
2069 "%s%s:%d: leftover conflict marker\n",
2070 line_prefix, data->filename, data->lineno);
2071 }
2072 bad = ws_check(line + 1, len - 1, data->ws_rule);
2073 if (!bad)
2074 return;
2075 data->status |= bad;
2076 err = whitespace_error_string(bad);
2077 fprintf(data->o->file, "%s%s:%d: %s.\n",
2078 line_prefix, data->filename, data->lineno, err);
2079 free(err);
2080 emit_line(data->o, set, reset, line, 1);
2081 ws_check_emit(line + 1, len - 1, data->ws_rule,
2082 data->o->file, set, reset, ws);
2083 } else if (line[0] == ' ') {
2084 data->lineno++;
2085 } else if (line[0] == '@') {
2086 char *plus = strchr(line, '+');
2087 if (plus)
2088 data->lineno = strtol(plus, NULL, 10) - 1;
2089 else
2090 die("invalid diff");
2091 }
2092 }
2093
2094 static unsigned char *deflate_it(char *data,
2095 unsigned long size,
2096 unsigned long *result_size)
2097 {
2098 int bound;
2099 unsigned char *deflated;
2100 git_zstream stream;
2101
2102 memset(&stream, 0, sizeof(stream));
2103 git_deflate_init(&stream, zlib_compression_level);
2104 bound = git_deflate_bound(&stream, size);
2105 deflated = xmalloc(bound);
2106 stream.next_out = deflated;
2107 stream.avail_out = bound;
2108
2109 stream.next_in = (unsigned char *)data;
2110 stream.avail_in = size;
2111 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2112 ; /* nothing */
2113 git_deflate_end(&stream);
2114 *result_size = stream.total_out;
2115 return deflated;
2116 }
2117
2118 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2119 const char *prefix)
2120 {
2121 void *cp;
2122 void *delta;
2123 void *deflated;
2124 void *data;
2125 unsigned long orig_size;
2126 unsigned long delta_size;
2127 unsigned long deflate_size;
2128 unsigned long data_size;
2129
2130 /* We could do deflated delta, or we could do just deflated two,
2131 * whichever is smaller.
2132 */
2133 delta = NULL;
2134 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2135 if (one->size && two->size) {
2136 delta = diff_delta(one->ptr, one->size,
2137 two->ptr, two->size,
2138 &delta_size, deflate_size);
2139 if (delta) {
2140 void *to_free = delta;
2141 orig_size = delta_size;
2142 delta = deflate_it(delta, delta_size, &delta_size);
2143 free(to_free);
2144 }
2145 }
2146
2147 if (delta && delta_size < deflate_size) {
2148 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2149 free(deflated);
2150 data = delta;
2151 data_size = delta_size;
2152 }
2153 else {
2154 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2155 free(delta);
2156 data = deflated;
2157 data_size = deflate_size;
2158 }
2159
2160 /* emit data encoded in base85 */
2161 cp = data;
2162 while (data_size) {
2163 int bytes = (52 < data_size) ? 52 : data_size;
2164 char line[70];
2165 data_size -= bytes;
2166 if (bytes <= 26)
2167 line[0] = bytes + 'A' - 1;
2168 else
2169 line[0] = bytes - 26 + 'a' - 1;
2170 encode_85(line + 1, cp, bytes);
2171 cp = (char *) cp + bytes;
2172 fprintf(file, "%s", prefix);
2173 fputs(line, file);
2174 fputc('\n', file);
2175 }
2176 fprintf(file, "%s\n", prefix);
2177 free(data);
2178 }
2179
2180 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2181 const char *prefix)
2182 {
2183 fprintf(file, "%sGIT binary patch\n", prefix);
2184 emit_binary_diff_body(file, one, two, prefix);
2185 emit_binary_diff_body(file, two, one, prefix);
2186 }
2187
2188 int diff_filespec_is_binary(struct diff_filespec *one)
2189 {
2190 if (one->is_binary == -1) {
2191 diff_filespec_load_driver(one);
2192 if (one->driver->binary != -1)
2193 one->is_binary = one->driver->binary;
2194 else {
2195 if (!one->data && DIFF_FILE_VALID(one))
2196 diff_populate_filespec(one, 0);
2197 if (one->data)
2198 one->is_binary = buffer_is_binary(one->data,
2199 one->size);
2200 if (one->is_binary == -1)
2201 one->is_binary = 0;
2202 }
2203 }
2204 return one->is_binary;
2205 }
2206
2207 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2208 {
2209 diff_filespec_load_driver(one);
2210 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2211 }
2212
2213 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2214 {
2215 if (!options->a_prefix)
2216 options->a_prefix = a;
2217 if (!options->b_prefix)
2218 options->b_prefix = b;
2219 }
2220
2221 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2222 {
2223 if (!DIFF_FILE_VALID(one))
2224 return NULL;
2225
2226 diff_filespec_load_driver(one);
2227 return userdiff_get_textconv(one->driver);
2228 }
2229
2230 static void builtin_diff(const char *name_a,
2231 const char *name_b,
2232 struct diff_filespec *one,
2233 struct diff_filespec *two,
2234 const char *xfrm_msg,
2235 int must_show_header,
2236 struct diff_options *o,
2237 int complete_rewrite)
2238 {
2239 mmfile_t mf1, mf2;
2240 const char *lbl[2];
2241 char *a_one, *b_two;
2242 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2243 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2244 const char *a_prefix, *b_prefix;
2245 struct userdiff_driver *textconv_one = NULL;
2246 struct userdiff_driver *textconv_two = NULL;
2247 struct strbuf header = STRBUF_INIT;
2248 const char *line_prefix = diff_line_prefix(o);
2249
2250 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2251 (!one->mode || S_ISGITLINK(one->mode)) &&
2252 (!two->mode || S_ISGITLINK(two->mode))) {
2253 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2254 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2255 show_submodule_summary(o->file, one->path ? one->path : two->path,
2256 line_prefix,
2257 one->sha1, two->sha1, two->dirty_submodule,
2258 meta, del, add, reset);
2259 return;
2260 }
2261
2262 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2263 textconv_one = get_textconv(one);
2264 textconv_two = get_textconv(two);
2265 }
2266
2267 diff_set_mnemonic_prefix(o, "a/", "b/");
2268 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2269 a_prefix = o->b_prefix;
2270 b_prefix = o->a_prefix;
2271 } else {
2272 a_prefix = o->a_prefix;
2273 b_prefix = o->b_prefix;
2274 }
2275
2276 /* Never use a non-valid filename anywhere if at all possible */
2277 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2278 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2279
2280 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2281 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2282 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2283 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2284 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2285 if (lbl[0][0] == '/') {
2286 /* /dev/null */
2287 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2288 if (xfrm_msg)
2289 strbuf_addstr(&header, xfrm_msg);
2290 must_show_header = 1;
2291 }
2292 else if (lbl[1][0] == '/') {
2293 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2294 if (xfrm_msg)
2295 strbuf_addstr(&header, xfrm_msg);
2296 must_show_header = 1;
2297 }
2298 else {
2299 if (one->mode != two->mode) {
2300 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2301 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2302 must_show_header = 1;
2303 }
2304 if (xfrm_msg)
2305 strbuf_addstr(&header, xfrm_msg);
2306
2307 /*
2308 * we do not run diff between different kind
2309 * of objects.
2310 */
2311 if ((one->mode ^ two->mode) & S_IFMT)
2312 goto free_ab_and_return;
2313 if (complete_rewrite &&
2314 (textconv_one || !diff_filespec_is_binary(one)) &&
2315 (textconv_two || !diff_filespec_is_binary(two))) {
2316 fprintf(o->file, "%s", header.buf);
2317 strbuf_reset(&header);
2318 emit_rewrite_diff(name_a, name_b, one, two,
2319 textconv_one, textconv_two, o);
2320 o->found_changes = 1;
2321 goto free_ab_and_return;
2322 }
2323 }
2324
2325 if (o->irreversible_delete && lbl[1][0] == '/') {
2326 fprintf(o->file, "%s", header.buf);
2327 strbuf_reset(&header);
2328 goto free_ab_and_return;
2329 } else if (!DIFF_OPT_TST(o, TEXT) &&
2330 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2331 (!textconv_two && diff_filespec_is_binary(two)) )) {
2332 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2333 die("unable to read files to diff");
2334 /* Quite common confusing case */
2335 if (mf1.size == mf2.size &&
2336 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2337 if (must_show_header)
2338 fprintf(o->file, "%s", header.buf);
2339 goto free_ab_and_return;
2340 }
2341 fprintf(o->file, "%s", header.buf);
2342 strbuf_reset(&header);
2343 if (DIFF_OPT_TST(o, BINARY))
2344 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2345 else
2346 fprintf(o->file, "%sBinary files %s and %s differ\n",
2347 line_prefix, lbl[0], lbl[1]);
2348 o->found_changes = 1;
2349 } else {
2350 /* Crazy xdl interfaces.. */
2351 const char *diffopts = getenv("GIT_DIFF_OPTS");
2352 xpparam_t xpp;
2353 xdemitconf_t xecfg;
2354 struct emit_callback ecbdata;
2355 const struct userdiff_funcname *pe;
2356
2357 if (must_show_header) {
2358 fprintf(o->file, "%s", header.buf);
2359 strbuf_reset(&header);
2360 }
2361
2362 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2363 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2364
2365 pe = diff_funcname_pattern(one);
2366 if (!pe)
2367 pe = diff_funcname_pattern(two);
2368
2369 memset(&xpp, 0, sizeof(xpp));
2370 memset(&xecfg, 0, sizeof(xecfg));
2371 memset(&ecbdata, 0, sizeof(ecbdata));
2372 ecbdata.label_path = lbl;
2373 ecbdata.color_diff = want_color(o->use_color);
2374 ecbdata.found_changesp = &o->found_changes;
2375 ecbdata.ws_rule = whitespace_rule(name_b);
2376 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2377 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2378 ecbdata.opt = o;
2379 ecbdata.header = header.len ? &header : NULL;
2380 xpp.flags = o->xdl_opts;
2381 xecfg.ctxlen = o->context;
2382 xecfg.interhunkctxlen = o->interhunkcontext;
2383 xecfg.flags = XDL_EMIT_FUNCNAMES;
2384 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2385 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2386 if (pe)
2387 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2388 if (!diffopts)
2389 ;
2390 else if (starts_with(diffopts, "--unified="))
2391 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2392 else if (starts_with(diffopts, "-u"))
2393 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2394 if (o->word_diff)
2395 init_diff_words_data(&ecbdata, o, one, two);
2396 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2397 &xpp, &xecfg);
2398 if (o->word_diff)
2399 free_diff_words_data(&ecbdata);
2400 if (textconv_one)
2401 free(mf1.ptr);
2402 if (textconv_two)
2403 free(mf2.ptr);
2404 xdiff_clear_find_func(&xecfg);
2405 }
2406
2407 free_ab_and_return:
2408 strbuf_release(&header);
2409 diff_free_filespec_data(one);
2410 diff_free_filespec_data(two);
2411 free(a_one);
2412 free(b_two);
2413 return;
2414 }
2415
2416 static void builtin_diffstat(const char *name_a, const char *name_b,
2417 struct diff_filespec *one,
2418 struct diff_filespec *two,
2419 struct diffstat_t *diffstat,
2420 struct diff_options *o,
2421 struct diff_filepair *p)
2422 {
2423 mmfile_t mf1, mf2;
2424 struct diffstat_file *data;
2425 int same_contents;
2426 int complete_rewrite = 0;
2427
2428 if (!DIFF_PAIR_UNMERGED(p)) {
2429 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2430 complete_rewrite = 1;
2431 }
2432
2433 data = diffstat_add(diffstat, name_a, name_b);
2434 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2435
2436 if (!one || !two) {
2437 data->is_unmerged = 1;
2438 return;
2439 }
2440
2441 same_contents = !hashcmp(one->sha1, two->sha1);
2442
2443 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2444 data->is_binary = 1;
2445 if (same_contents) {
2446 data->added = 0;
2447 data->deleted = 0;
2448 } else {
2449 data->added = diff_filespec_size(two);
2450 data->deleted = diff_filespec_size(one);
2451 }
2452 }
2453
2454 else if (complete_rewrite) {
2455 diff_populate_filespec(one, 0);
2456 diff_populate_filespec(two, 0);
2457 data->deleted = count_lines(one->data, one->size);
2458 data->added = count_lines(two->data, two->size);
2459 }
2460
2461 else if (!same_contents) {
2462 /* Crazy xdl interfaces.. */
2463 xpparam_t xpp;
2464 xdemitconf_t xecfg;
2465
2466 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2467 die("unable to read files to diff");
2468
2469 memset(&xpp, 0, sizeof(xpp));
2470 memset(&xecfg, 0, sizeof(xecfg));
2471 xpp.flags = o->xdl_opts;
2472 xecfg.ctxlen = o->context;
2473 xecfg.interhunkctxlen = o->interhunkcontext;
2474 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2475 &xpp, &xecfg);
2476 }
2477
2478 diff_free_filespec_data(one);
2479 diff_free_filespec_data(two);
2480 }
2481
2482 static void builtin_checkdiff(const char *name_a, const char *name_b,
2483 const char *attr_path,
2484 struct diff_filespec *one,
2485 struct diff_filespec *two,
2486 struct diff_options *o)
2487 {
2488 mmfile_t mf1, mf2;
2489 struct checkdiff_t data;
2490
2491 if (!two)
2492 return;
2493
2494 memset(&data, 0, sizeof(data));
2495 data.filename = name_b ? name_b : name_a;
2496 data.lineno = 0;
2497 data.o = o;
2498 data.ws_rule = whitespace_rule(attr_path);
2499 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2500
2501 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2502 die("unable to read files to diff");
2503
2504 /*
2505 * All the other codepaths check both sides, but not checking
2506 * the "old" side here is deliberate. We are checking the newly
2507 * introduced changes, and as long as the "new" side is text, we
2508 * can and should check what it introduces.
2509 */
2510 if (diff_filespec_is_binary(two))
2511 goto free_and_return;
2512 else {
2513 /* Crazy xdl interfaces.. */
2514 xpparam_t xpp;
2515 xdemitconf_t xecfg;
2516
2517 memset(&xpp, 0, sizeof(xpp));
2518 memset(&xecfg, 0, sizeof(xecfg));
2519 xecfg.ctxlen = 1; /* at least one context line */
2520 xpp.flags = 0;
2521 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2522 &xpp, &xecfg);
2523
2524 if (data.ws_rule & WS_BLANK_AT_EOF) {
2525 struct emit_callback ecbdata;
2526 int blank_at_eof;
2527
2528 ecbdata.ws_rule = data.ws_rule;
2529 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2530 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2531
2532 if (blank_at_eof) {
2533 static char *err;
2534 if (!err)
2535 err = whitespace_error_string(WS_BLANK_AT_EOF);
2536 fprintf(o->file, "%s:%d: %s.\n",
2537 data.filename, blank_at_eof, err);
2538 data.status = 1; /* report errors */
2539 }
2540 }
2541 }
2542 free_and_return:
2543 diff_free_filespec_data(one);
2544 diff_free_filespec_data(two);
2545 if (data.status)
2546 DIFF_OPT_SET(o, CHECK_FAILED);
2547 }
2548
2549 struct diff_filespec *alloc_filespec(const char *path)
2550 {
2551 int namelen = strlen(path);
2552 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2553
2554 memset(spec, 0, sizeof(*spec));
2555 spec->path = (char *)(spec + 1);
2556 memcpy(spec->path, path, namelen+1);
2557 spec->count = 1;
2558 spec->is_binary = -1;
2559 return spec;
2560 }
2561
2562 void free_filespec(struct diff_filespec *spec)
2563 {
2564 if (!--spec->count) {
2565 diff_free_filespec_data(spec);
2566 free(spec);
2567 }
2568 }
2569
2570 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2571 int sha1_valid, unsigned short mode)
2572 {
2573 if (mode) {
2574 spec->mode = canon_mode(mode);
2575 hashcpy(spec->sha1, sha1);
2576 spec->sha1_valid = sha1_valid;
2577 }
2578 }
2579
2580 /*
2581 * Given a name and sha1 pair, if the index tells us the file in
2582 * the work tree has that object contents, return true, so that
2583 * prepare_temp_file() does not have to inflate and extract.
2584 */
2585 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2586 {
2587 const struct cache_entry *ce;
2588 struct stat st;
2589 int pos, len;
2590
2591 /*
2592 * We do not read the cache ourselves here, because the
2593 * benchmark with my previous version that always reads cache
2594 * shows that it makes things worse for diff-tree comparing
2595 * two linux-2.6 kernel trees in an already checked out work
2596 * tree. This is because most diff-tree comparisons deal with
2597 * only a small number of files, while reading the cache is
2598 * expensive for a large project, and its cost outweighs the
2599 * savings we get by not inflating the object to a temporary
2600 * file. Practically, this code only helps when we are used
2601 * by diff-cache --cached, which does read the cache before
2602 * calling us.
2603 */
2604 if (!active_cache)
2605 return 0;
2606
2607 /* We want to avoid the working directory if our caller
2608 * doesn't need the data in a normal file, this system
2609 * is rather slow with its stat/open/mmap/close syscalls,
2610 * and the object is contained in a pack file. The pack
2611 * is probably already open and will be faster to obtain
2612 * the data through than the working directory. Loose
2613 * objects however would tend to be slower as they need
2614 * to be individually opened and inflated.
2615 */
2616 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2617 return 0;
2618
2619 len = strlen(name);
2620 pos = cache_name_pos(name, len);
2621 if (pos < 0)
2622 return 0;
2623 ce = active_cache[pos];
2624
2625 /*
2626 * This is not the sha1 we are looking for, or
2627 * unreusable because it is not a regular file.
2628 */
2629 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2630 return 0;
2631
2632 /*
2633 * If ce is marked as "assume unchanged", there is no
2634 * guarantee that work tree matches what we are looking for.
2635 */
2636 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2637 return 0;
2638
2639 /*
2640 * If ce matches the file in the work tree, we can reuse it.
2641 */
2642 if (ce_uptodate(ce) ||
2643 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2644 return 1;
2645
2646 return 0;
2647 }
2648
2649 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2650 {
2651 int len;
2652 char *data = xmalloc(100), *dirty = "";
2653
2654 /* Are we looking at the work tree? */
2655 if (s->dirty_submodule)
2656 dirty = "-dirty";
2657
2658 len = snprintf(data, 100,
2659 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2660 s->data = data;
2661 s->size = len;
2662 s->should_free = 1;
2663 if (size_only) {
2664 s->data = NULL;
2665 free(data);
2666 }
2667 return 0;
2668 }
2669
2670 /*
2671 * While doing rename detection and pickaxe operation, we may need to
2672 * grab the data for the blob (or file) for our own in-core comparison.
2673 * diff_filespec has data and size fields for this purpose.
2674 */
2675 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2676 {
2677 int err = 0;
2678 /*
2679 * demote FAIL to WARN to allow inspecting the situation
2680 * instead of refusing.
2681 */
2682 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2683 ? SAFE_CRLF_WARN
2684 : safe_crlf);
2685
2686 if (!DIFF_FILE_VALID(s))
2687 die("internal error: asking to populate invalid file.");
2688 if (S_ISDIR(s->mode))
2689 return -1;
2690
2691 if (s->data)
2692 return 0;
2693
2694 if (size_only && 0 < s->size)
2695 return 0;
2696
2697 if (S_ISGITLINK(s->mode))
2698 return diff_populate_gitlink(s, size_only);
2699
2700 if (!s->sha1_valid ||
2701 reuse_worktree_file(s->path, s->sha1, 0)) {
2702 struct strbuf buf = STRBUF_INIT;
2703 struct stat st;
2704 int fd;
2705
2706 if (lstat(s->path, &st) < 0) {
2707 if (errno == ENOENT) {
2708 err_empty:
2709 err = -1;
2710 empty:
2711 s->data = (char *)"";
2712 s->size = 0;
2713 return err;
2714 }
2715 }
2716 s->size = xsize_t(st.st_size);
2717 if (!s->size)
2718 goto empty;
2719 if (S_ISLNK(st.st_mode)) {
2720 struct strbuf sb = STRBUF_INIT;
2721
2722 if (strbuf_readlink(&sb, s->path, s->size))
2723 goto err_empty;
2724 s->size = sb.len;
2725 s->data = strbuf_detach(&sb, NULL);
2726 s->should_free = 1;
2727 return 0;
2728 }
2729 if (size_only)
2730 return 0;
2731 fd = open(s->path, O_RDONLY);
2732 if (fd < 0)
2733 goto err_empty;
2734 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2735 close(fd);
2736 s->should_munmap = 1;
2737
2738 /*
2739 * Convert from working tree format to canonical git format
2740 */
2741 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2742 size_t size = 0;
2743 munmap(s->data, s->size);
2744 s->should_munmap = 0;
2745 s->data = strbuf_detach(&buf, &size);
2746 s->size = size;
2747 s->should_free = 1;
2748 }
2749 }
2750 else {
2751 enum object_type type;
2752 if (size_only) {
2753 type = sha1_object_info(s->sha1, &s->size);
2754 if (type < 0)
2755 die("unable to read %s", sha1_to_hex(s->sha1));
2756 } else {
2757 s->data = read_sha1_file(s->sha1, &type, &s->size);
2758 if (!s->data)
2759 die("unable to read %s", sha1_to_hex(s->sha1));
2760 s->should_free = 1;
2761 }
2762 }
2763 return 0;
2764 }
2765
2766 void diff_free_filespec_blob(struct diff_filespec *s)
2767 {
2768 if (s->should_free)
2769 free(s->data);
2770 else if (s->should_munmap)
2771 munmap(s->data, s->size);
2772
2773 if (s->should_free || s->should_munmap) {
2774 s->should_free = s->should_munmap = 0;
2775 s->data = NULL;
2776 }
2777 }
2778
2779 void diff_free_filespec_data(struct diff_filespec *s)
2780 {
2781 diff_free_filespec_blob(s);
2782 free(s->cnt_data);
2783 s->cnt_data = NULL;
2784 }
2785
2786 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2787 void *blob,
2788 unsigned long size,
2789 const unsigned char *sha1,
2790 int mode)
2791 {
2792 int fd;
2793 struct strbuf buf = STRBUF_INIT;
2794 struct strbuf template = STRBUF_INIT;
2795 char *path_dup = xstrdup(path);
2796 const char *base = basename(path_dup);
2797
2798 /* Generate "XXXXXX_basename.ext" */
2799 strbuf_addstr(&template, "XXXXXX_");
2800 strbuf_addstr(&template, base);
2801
2802 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2803 strlen(base) + 1);
2804 if (fd < 0)
2805 die_errno("unable to create temp-file");
2806 if (convert_to_working_tree(path,
2807 (const char *)blob, (size_t)size, &buf)) {
2808 blob = buf.buf;
2809 size = buf.len;
2810 }
2811 if (write_in_full(fd, blob, size) != size)
2812 die_errno("unable to write temp-file");
2813 close(fd);
2814 temp->name = temp->tmp_path;
2815 strcpy(temp->hex, sha1_to_hex(sha1));
2816 temp->hex[40] = 0;
2817 sprintf(temp->mode, "%06o", mode);
2818 strbuf_release(&buf);
2819 strbuf_release(&template);
2820 free(path_dup);
2821 }
2822
2823 static struct diff_tempfile *prepare_temp_file(const char *name,
2824 struct diff_filespec *one)
2825 {
2826 struct diff_tempfile *temp = claim_diff_tempfile();
2827
2828 if (!DIFF_FILE_VALID(one)) {
2829 not_a_valid_file:
2830 /* A '-' entry produces this for file-2, and
2831 * a '+' entry produces this for file-1.
2832 */
2833 temp->name = "/dev/null";
2834 strcpy(temp->hex, ".");
2835 strcpy(temp->mode, ".");
2836 return temp;
2837 }
2838
2839 if (!remove_tempfile_installed) {
2840 atexit(remove_tempfile);
2841 sigchain_push_common(remove_tempfile_on_signal);
2842 remove_tempfile_installed = 1;
2843 }
2844
2845 if (!one->sha1_valid ||
2846 reuse_worktree_file(name, one->sha1, 1)) {
2847 struct stat st;
2848 if (lstat(name, &st) < 0) {
2849 if (errno == ENOENT)
2850 goto not_a_valid_file;
2851 die_errno("stat(%s)", name);
2852 }
2853 if (S_ISLNK(st.st_mode)) {
2854 struct strbuf sb = STRBUF_INIT;
2855 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2856 die_errno("readlink(%s)", name);
2857 prep_temp_blob(name, temp, sb.buf, sb.len,
2858 (one->sha1_valid ?
2859 one->sha1 : null_sha1),
2860 (one->sha1_valid ?
2861 one->mode : S_IFLNK));
2862 strbuf_release(&sb);
2863 }
2864 else {
2865 /* we can borrow from the file in the work tree */
2866 temp->name = name;
2867 if (!one->sha1_valid)
2868 strcpy(temp->hex, sha1_to_hex(null_sha1));
2869 else
2870 strcpy(temp->hex, sha1_to_hex(one->sha1));
2871 /* Even though we may sometimes borrow the
2872 * contents from the work tree, we always want
2873 * one->mode. mode is trustworthy even when
2874 * !(one->sha1_valid), as long as
2875 * DIFF_FILE_VALID(one).
2876 */
2877 sprintf(temp->mode, "%06o", one->mode);
2878 }
2879 return temp;
2880 }
2881 else {
2882 if (diff_populate_filespec(one, 0))
2883 die("cannot read data blob for %s", one->path);
2884 prep_temp_blob(name, temp, one->data, one->size,
2885 one->sha1, one->mode);
2886 }
2887 return temp;
2888 }
2889
2890 /* An external diff command takes:
2891 *
2892 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2893 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2894 *
2895 */
2896 static void run_external_diff(const char *pgm,
2897 const char *name,
2898 const char *other,
2899 struct diff_filespec *one,
2900 struct diff_filespec *two,
2901 const char *xfrm_msg,
2902 int complete_rewrite)
2903 {
2904 const char *spawn_arg[10];
2905 int retval;
2906 const char **arg = &spawn_arg[0];
2907
2908 if (one && two) {
2909 struct diff_tempfile *temp_one, *temp_two;
2910 const char *othername = (other ? other : name);
2911 temp_one = prepare_temp_file(name, one);
2912 temp_two = prepare_temp_file(othername, two);
2913 *arg++ = pgm;
2914 *arg++ = name;
2915 *arg++ = temp_one->name;
2916 *arg++ = temp_one->hex;
2917 *arg++ = temp_one->mode;
2918 *arg++ = temp_two->name;
2919 *arg++ = temp_two->hex;
2920 *arg++ = temp_two->mode;
2921 if (other) {
2922 *arg++ = other;
2923 *arg++ = xfrm_msg;
2924 }
2925 } else {
2926 *arg++ = pgm;
2927 *arg++ = name;
2928 }
2929 *arg = NULL;
2930 fflush(NULL);
2931 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2932 remove_tempfile();
2933 if (retval) {
2934 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2935 exit(1);
2936 }
2937 }
2938
2939 static int similarity_index(struct diff_filepair *p)
2940 {
2941 return p->score * 100 / MAX_SCORE;
2942 }
2943
2944 static void fill_metainfo(struct strbuf *msg,
2945 const char *name,
2946 const char *other,
2947 struct diff_filespec *one,
2948 struct diff_filespec *two,
2949 struct diff_options *o,
2950 struct diff_filepair *p,
2951 int *must_show_header,
2952 int use_color)
2953 {
2954 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2955 const char *reset = diff_get_color(use_color, DIFF_RESET);
2956 const char *line_prefix = diff_line_prefix(o);
2957
2958 *must_show_header = 1;
2959 strbuf_init(msg, PATH_MAX * 2 + 300);
2960 switch (p->status) {
2961 case DIFF_STATUS_COPIED:
2962 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2963 line_prefix, set, similarity_index(p));
2964 strbuf_addf(msg, "%s\n%s%scopy from ",
2965 reset, line_prefix, set);
2966 quote_c_style(name, msg, NULL, 0);
2967 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2968 quote_c_style(other, msg, NULL, 0);
2969 strbuf_addf(msg, "%s\n", reset);
2970 break;
2971 case DIFF_STATUS_RENAMED:
2972 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2973 line_prefix, set, similarity_index(p));
2974 strbuf_addf(msg, "%s\n%s%srename from ",
2975 reset, line_prefix, set);
2976 quote_c_style(name, msg, NULL, 0);
2977 strbuf_addf(msg, "%s\n%s%srename to ",
2978 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_MODIFIED:
2983 if (p->score) {
2984 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2985 line_prefix,
2986 set, similarity_index(p), reset);
2987 break;
2988 }
2989 /* fallthru */
2990 default:
2991 *must_show_header = 0;
2992 }
2993 if (one && two && hashcmp(one->sha1, two->sha1)) {
2994 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2995
2996 if (DIFF_OPT_TST(o, BINARY)) {
2997 mmfile_t mf;
2998 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2999 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3000 abbrev = 40;
3001 }
3002 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3003 find_unique_abbrev(one->sha1, abbrev));
3004 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3005 if (one->mode == two->mode)
3006 strbuf_addf(msg, " %06o", one->mode);
3007 strbuf_addf(msg, "%s\n", reset);
3008 }
3009 }
3010
3011 static void run_diff_cmd(const char *pgm,
3012 const char *name,
3013 const char *other,
3014 const char *attr_path,
3015 struct diff_filespec *one,
3016 struct diff_filespec *two,
3017 struct strbuf *msg,
3018 struct diff_options *o,
3019 struct diff_filepair *p)
3020 {
3021 const char *xfrm_msg = NULL;
3022 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3023 int must_show_header = 0;
3024
3025
3026 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3027 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3028 if (drv && drv->external)
3029 pgm = drv->external;
3030 }
3031
3032 if (msg) {
3033 /*
3034 * don't use colors when the header is intended for an
3035 * external diff driver
3036 */
3037 fill_metainfo(msg, name, other, one, two, o, p,
3038 &must_show_header,
3039 want_color(o->use_color) && !pgm);
3040 xfrm_msg = msg->len ? msg->buf : NULL;
3041 }
3042
3043 if (pgm) {
3044 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3045 complete_rewrite);
3046 return;
3047 }
3048 if (one && two)
3049 builtin_diff(name, other ? other : name,
3050 one, two, xfrm_msg, must_show_header,
3051 o, complete_rewrite);
3052 else
3053 fprintf(o->file, "* Unmerged path %s\n", name);
3054 }
3055
3056 static void diff_fill_sha1_info(struct diff_filespec *one)
3057 {
3058 if (DIFF_FILE_VALID(one)) {
3059 if (!one->sha1_valid) {
3060 struct stat st;
3061 if (one->is_stdin) {
3062 hashcpy(one->sha1, null_sha1);
3063 return;
3064 }
3065 if (lstat(one->path, &st) < 0)
3066 die_errno("stat '%s'", one->path);
3067 if (index_path(one->sha1, one->path, &st, 0))
3068 die("cannot hash %s", one->path);
3069 }
3070 }
3071 else
3072 hashclr(one->sha1);
3073 }
3074
3075 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3076 {
3077 /* Strip the prefix but do not molest /dev/null and absolute paths */
3078 if (*namep && **namep != '/') {
3079 *namep += prefix_length;
3080 if (**namep == '/')
3081 ++*namep;
3082 }
3083 if (*otherp && **otherp != '/') {
3084 *otherp += prefix_length;
3085 if (**otherp == '/')
3086 ++*otherp;
3087 }
3088 }
3089
3090 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3091 {
3092 const char *pgm = external_diff();
3093 struct strbuf msg;
3094 struct diff_filespec *one = p->one;
3095 struct diff_filespec *two = p->two;
3096 const char *name;
3097 const char *other;
3098 const char *attr_path;
3099
3100 name = p->one->path;
3101 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3102 attr_path = name;
3103 if (o->prefix_length)
3104 strip_prefix(o->prefix_length, &name, &other);
3105
3106 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3107 pgm = NULL;
3108
3109 if (DIFF_PAIR_UNMERGED(p)) {
3110 run_diff_cmd(pgm, name, NULL, attr_path,
3111 NULL, NULL, NULL, o, p);
3112 return;
3113 }
3114
3115 diff_fill_sha1_info(one);
3116 diff_fill_sha1_info(two);
3117
3118 if (!pgm &&
3119 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3120 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3121 /*
3122 * a filepair that changes between file and symlink
3123 * needs to be split into deletion and creation.
3124 */
3125 struct diff_filespec *null = alloc_filespec(two->path);
3126 run_diff_cmd(NULL, name, other, attr_path,
3127 one, null, &msg, o, p);
3128 free(null);
3129 strbuf_release(&msg);
3130
3131 null = alloc_filespec(one->path);
3132 run_diff_cmd(NULL, name, other, attr_path,
3133 null, two, &msg, o, p);
3134 free(null);
3135 }
3136 else
3137 run_diff_cmd(pgm, name, other, attr_path,
3138 one, two, &msg, o, p);
3139
3140 strbuf_release(&msg);
3141 }
3142
3143 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3144 struct diffstat_t *diffstat)
3145 {
3146 const char *name;
3147 const char *other;
3148
3149 if (DIFF_PAIR_UNMERGED(p)) {
3150 /* unmerged */
3151 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3152 return;
3153 }
3154
3155 name = p->one->path;
3156 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3157
3158 if (o->prefix_length)
3159 strip_prefix(o->prefix_length, &name, &other);
3160
3161 diff_fill_sha1_info(p->one);
3162 diff_fill_sha1_info(p->two);
3163
3164 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3165 }
3166
3167 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3168 {
3169 const char *name;
3170 const char *other;
3171 const char *attr_path;
3172
3173 if (DIFF_PAIR_UNMERGED(p)) {
3174 /* unmerged */
3175 return;
3176 }
3177
3178 name = p->one->path;
3179 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3180 attr_path = other ? other : name;
3181
3182 if (o->prefix_length)
3183 strip_prefix(o->prefix_length, &name, &other);
3184
3185 diff_fill_sha1_info(p->one);
3186 diff_fill_sha1_info(p->two);
3187
3188 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3189 }
3190
3191 void diff_setup(struct diff_options *options)
3192 {
3193 memcpy(options, &default_diff_options, sizeof(*options));
3194
3195 options->file = stdout;
3196
3197 options->line_termination = '\n';
3198 options->break_opt = -1;
3199 options->rename_limit = -1;
3200 options->dirstat_permille = diff_dirstat_permille_default;
3201 options->context = diff_context_default;
3202 DIFF_OPT_SET(options, RENAME_EMPTY);
3203
3204 options->change = diff_change;
3205 options->add_remove = diff_addremove;
3206 options->use_color = diff_use_color_default;
3207 options->detect_rename = diff_detect_rename_default;
3208 options->xdl_opts |= diff_algorithm;
3209
3210 if (diff_no_prefix) {
3211 options->a_prefix = options->b_prefix = "";
3212 } else if (!diff_mnemonic_prefix) {
3213 options->a_prefix = "a/";
3214 options->b_prefix = "b/";
3215 }
3216 }
3217
3218 void diff_setup_done(struct diff_options *options)
3219 {
3220 int count = 0;
3221
3222 if (options->set_default)
3223 options->set_default(options);
3224
3225 if (options->output_format & DIFF_FORMAT_NAME)
3226 count++;
3227 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3228 count++;
3229 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3230 count++;
3231 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3232 count++;
3233 if (count > 1)
3234 die("--name-only, --name-status, --check and -s are mutually exclusive");
3235
3236 /*
3237 * Most of the time we can say "there are changes"
3238 * only by checking if there are changed paths, but
3239 * --ignore-whitespace* options force us to look
3240 * inside contents.
3241 */
3242
3243 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3244 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3245 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3246 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3247 else
3248 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3249
3250 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3251 options->detect_rename = DIFF_DETECT_COPY;
3252
3253 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3254 options->prefix = NULL;
3255 if (options->prefix)
3256 options->prefix_length = strlen(options->prefix);
3257 else
3258 options->prefix_length = 0;
3259
3260 if (options->output_format & (DIFF_FORMAT_NAME |
3261 DIFF_FORMAT_NAME_STATUS |
3262 DIFF_FORMAT_CHECKDIFF |
3263 DIFF_FORMAT_NO_OUTPUT))
3264 options->output_format &= ~(DIFF_FORMAT_RAW |
3265 DIFF_FORMAT_NUMSTAT |
3266 DIFF_FORMAT_DIFFSTAT |
3267 DIFF_FORMAT_SHORTSTAT |
3268 DIFF_FORMAT_DIRSTAT |
3269 DIFF_FORMAT_SUMMARY |
3270 DIFF_FORMAT_PATCH);
3271
3272 /*
3273 * These cases always need recursive; we do not drop caller-supplied
3274 * recursive bits for other formats here.
3275 */
3276 if (options->output_format & (DIFF_FORMAT_PATCH |
3277 DIFF_FORMAT_NUMSTAT |
3278 DIFF_FORMAT_DIFFSTAT |
3279 DIFF_FORMAT_SHORTSTAT |
3280 DIFF_FORMAT_DIRSTAT |
3281 DIFF_FORMAT_SUMMARY |
3282 DIFF_FORMAT_CHECKDIFF))
3283 DIFF_OPT_SET(options, RECURSIVE);
3284 /*
3285 * Also pickaxe would not work very well if you do not say recursive
3286 */
3287 if (options->pickaxe)
3288 DIFF_OPT_SET(options, RECURSIVE);
3289 /*
3290 * When patches are generated, submodules diffed against the work tree
3291 * must be checked for dirtiness too so it can be shown in the output
3292 */
3293 if (options->output_format & DIFF_FORMAT_PATCH)
3294 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3295
3296 if (options->detect_rename && options->rename_limit < 0)
3297 options->rename_limit = diff_rename_limit_default;
3298 if (options->setup & DIFF_SETUP_USE_CACHE) {
3299 if (!active_cache)
3300 /* read-cache does not die even when it fails
3301 * so it is safe for us to do this here. Also
3302 * it does not smudge active_cache or active_nr
3303 * when it fails, so we do not have to worry about
3304 * cleaning it up ourselves either.
3305 */
3306 read_cache();
3307 }
3308 if (options->abbrev <= 0 || 40 < options->abbrev)
3309 options->abbrev = 40; /* full */
3310
3311 /*
3312 * It does not make sense to show the first hit we happened
3313 * to have found. It does not make sense not to return with
3314 * exit code in such a case either.
3315 */
3316 if (DIFF_OPT_TST(options, QUICK)) {
3317 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3318 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3319 }
3320 }
3321
3322 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3323 {
3324 char c, *eq;
3325 int len;
3326
3327 if (*arg != '-')
3328 return 0;
3329 c = *++arg;
3330 if (!c)
3331 return 0;
3332 if (c == arg_short) {
3333 c = *++arg;
3334 if (!c)
3335 return 1;
3336 if (val && isdigit(c)) {
3337 char *end;
3338 int n = strtoul(arg, &end, 10);
3339 if (*end)
3340 return 0;
3341 *val = n;
3342 return 1;
3343 }
3344 return 0;
3345 }
3346 if (c != '-')
3347 return 0;
3348 arg++;
3349 eq = strchr(arg, '=');
3350 if (eq)
3351 len = eq - arg;
3352 else
3353 len = strlen(arg);
3354 if (!len || strncmp(arg, arg_long, len))
3355 return 0;
3356 if (eq) {
3357 int n;
3358 char *end;
3359 if (!isdigit(*++eq))
3360 return 0;
3361 n = strtoul(eq, &end, 10);
3362 if (*end)
3363 return 0;
3364 *val = n;
3365 }
3366 return 1;
3367 }
3368
3369 static int diff_scoreopt_parse(const char *opt);
3370
3371 static inline int short_opt(char opt, const char **argv,
3372 const char **optarg)
3373 {
3374 const char *arg = argv[0];
3375 if (arg[0] != '-' || arg[1] != opt)
3376 return 0;
3377 if (arg[2] != '\0') {
3378 *optarg = arg + 2;
3379 return 1;
3380 }
3381 if (!argv[1])
3382 die("Option '%c' requires a value", opt);
3383 *optarg = argv[1];
3384 return 2;
3385 }
3386
3387 int parse_long_opt(const char *opt, const char **argv,
3388 const char **optarg)
3389 {
3390 const char *arg = argv[0];
3391 if (arg[0] != '-' || arg[1] != '-')
3392 return 0;
3393 arg += strlen("--");
3394 if (!starts_with(arg, opt))
3395 return 0;
3396 arg += strlen(opt);
3397 if (*arg == '=') { /* stuck form: --option=value */
3398 *optarg = arg + 1;
3399 return 1;
3400 }
3401 if (*arg != '\0')
3402 return 0;
3403 /* separate form: --option value */
3404 if (!argv[1])
3405 die("Option '--%s' requires a value", opt);
3406 *optarg = argv[1];
3407 return 2;
3408 }
3409
3410 static int stat_opt(struct diff_options *options, const char **av)
3411 {
3412 const char *arg = av[0];
3413 char *end;
3414 int width = options->stat_width;
3415 int name_width = options->stat_name_width;
3416 int graph_width = options->stat_graph_width;
3417 int count = options->stat_count;
3418 int argcount = 1;
3419
3420 arg += strlen("--stat");
3421 end = (char *)arg;
3422
3423 switch (*arg) {
3424 case '-':
3425 if (starts_with(arg, "-width")) {
3426 arg += strlen("-width");
3427 if (*arg == '=')
3428 width = strtoul(arg + 1, &end, 10);
3429 else if (!*arg && !av[1])
3430 die("Option '--stat-width' requires a value");
3431 else if (!*arg) {
3432 width = strtoul(av[1], &end, 10);
3433 argcount = 2;
3434 }
3435 } else if (starts_with(arg, "-name-width")) {
3436 arg += strlen("-name-width");
3437 if (*arg == '=')
3438 name_width = strtoul(arg + 1, &end, 10);
3439 else if (!*arg && !av[1])
3440 die("Option '--stat-name-width' requires a value");
3441 else if (!*arg) {
3442 name_width = strtoul(av[1], &end, 10);
3443 argcount = 2;
3444 }
3445 } else if (starts_with(arg, "-graph-width")) {
3446 arg += strlen("-graph-width");
3447 if (*arg == '=')
3448 graph_width = strtoul(arg + 1, &end, 10);
3449 else if (!*arg && !av[1])
3450 die("Option '--stat-graph-width' requires a value");
3451 else if (!*arg) {
3452 graph_width = strtoul(av[1], &end, 10);
3453 argcount = 2;
3454 }
3455 } else if (starts_with(arg, "-count")) {
3456 arg += strlen("-count");
3457 if (*arg == '=')
3458 count = strtoul(arg + 1, &end, 10);
3459 else if (!*arg && !av[1])
3460 die("Option '--stat-count' requires a value");
3461 else if (!*arg) {
3462 count = strtoul(av[1], &end, 10);
3463 argcount = 2;
3464 }
3465 }
3466 break;
3467 case '=':
3468 width = strtoul(arg+1, &end, 10);
3469 if (*end == ',')
3470 name_width = strtoul(end+1, &end, 10);
3471 if (*end == ',')
3472 count = strtoul(end+1, &end, 10);
3473 }
3474
3475 /* Important! This checks all the error cases! */
3476 if (*end)
3477 return 0;
3478 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3479 options->stat_name_width = name_width;
3480 options->stat_graph_width = graph_width;
3481 options->stat_width = width;
3482 options->stat_count = count;
3483 return argcount;
3484 }
3485
3486 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3487 {
3488 struct strbuf errmsg = STRBUF_INIT;
3489 if (parse_dirstat_params(options, params, &errmsg))
3490 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3491 errmsg.buf);
3492 strbuf_release(&errmsg);
3493 /*
3494 * The caller knows a dirstat-related option is given from the command
3495 * line; allow it to say "return this_function();"
3496 */
3497 options->output_format |= DIFF_FORMAT_DIRSTAT;
3498 return 1;
3499 }
3500
3501 static int parse_submodule_opt(struct diff_options *options, const char *value)
3502 {
3503 if (parse_submodule_params(options, value))
3504 die(_("Failed to parse --submodule option parameter: '%s'"),
3505 value);
3506 return 1;
3507 }
3508
3509 static const char diff_status_letters[] = {
3510 DIFF_STATUS_ADDED,
3511 DIFF_STATUS_COPIED,
3512 DIFF_STATUS_DELETED,
3513 DIFF_STATUS_MODIFIED,
3514 DIFF_STATUS_RENAMED,
3515 DIFF_STATUS_TYPE_CHANGED,
3516 DIFF_STATUS_UNKNOWN,
3517 DIFF_STATUS_UNMERGED,
3518 DIFF_STATUS_FILTER_AON,
3519 DIFF_STATUS_FILTER_BROKEN,
3520 '\0',
3521 };
3522
3523 static unsigned int filter_bit['Z' + 1];
3524
3525 static void prepare_filter_bits(void)
3526 {
3527 int i;
3528
3529 if (!filter_bit[DIFF_STATUS_ADDED]) {
3530 for (i = 0; diff_status_letters[i]; i++)
3531 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3532 }
3533 }
3534
3535 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3536 {
3537 return opt->filter & filter_bit[(int) status];
3538 }
3539
3540 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3541 {
3542 int i, optch;
3543
3544 prepare_filter_bits();
3545
3546 /*
3547 * If there is a negation e.g. 'd' in the input, and we haven't
3548 * initialized the filter field with another --diff-filter, start
3549 * from full set of bits, except for AON.
3550 */
3551 if (!opt->filter) {
3552 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3553 if (optch < 'a' || 'z' < optch)
3554 continue;
3555 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3556 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3557 break;
3558 }
3559 }
3560
3561 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3562 unsigned int bit;
3563 int negate;
3564
3565 if ('a' <= optch && optch <= 'z') {
3566 negate = 1;
3567 optch = toupper(optch);
3568 } else {
3569 negate = 0;
3570 }
3571
3572 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3573 if (!bit)
3574 return optarg[i];
3575 if (negate)
3576 opt->filter &= ~bit;
3577 else
3578 opt->filter |= bit;
3579 }
3580 return 0;
3581 }
3582
3583 /* Used only by "diff-files" and "diff --no-index" */
3584 void handle_deprecated_show_diff_q(struct diff_options *opt)
3585 {
3586 warning("'diff -q' and 'diff-files -q' are deprecated.");
3587 warning("Use 'diff --diff-filter=d' instead to ignore deleted filepairs.");
3588 parse_diff_filter_opt("d", opt);
3589 }
3590
3591 static void enable_patch_output(int *fmt) {
3592 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3593 *fmt |= DIFF_FORMAT_PATCH;
3594 }
3595
3596 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3597 {
3598 const char *arg = av[0];
3599 const char *optarg;
3600 int argcount;
3601
3602 /* Output format options */
3603 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3604 || opt_arg(arg, 'U', "unified", &options->context))
3605 enable_patch_output(&options->output_format);
3606 else if (!strcmp(arg, "--raw"))
3607 options->output_format |= DIFF_FORMAT_RAW;
3608 else if (!strcmp(arg, "--patch-with-raw")) {
3609 enable_patch_output(&options->output_format);
3610 options->output_format |= DIFF_FORMAT_RAW;
3611 } else if (!strcmp(arg, "--numstat"))
3612 options->output_format |= DIFF_FORMAT_NUMSTAT;
3613 else if (!strcmp(arg, "--shortstat"))
3614 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3615 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3616 return parse_dirstat_opt(options, "");
3617 else if (starts_with(arg, "-X"))
3618 return parse_dirstat_opt(options, arg + 2);
3619 else if (starts_with(arg, "--dirstat="))
3620 return parse_dirstat_opt(options, arg + 10);
3621 else if (!strcmp(arg, "--cumulative"))
3622 return parse_dirstat_opt(options, "cumulative");
3623 else if (!strcmp(arg, "--dirstat-by-file"))
3624 return parse_dirstat_opt(options, "files");
3625 else if (starts_with(arg, "--dirstat-by-file=")) {
3626 parse_dirstat_opt(options, "files");
3627 return parse_dirstat_opt(options, arg + 18);
3628 }
3629 else if (!strcmp(arg, "--check"))
3630 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3631 else if (!strcmp(arg, "--summary"))
3632 options->output_format |= DIFF_FORMAT_SUMMARY;
3633 else if (!strcmp(arg, "--patch-with-stat")) {
3634 enable_patch_output(&options->output_format);
3635 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3636 } else if (!strcmp(arg, "--name-only"))
3637 options->output_format |= DIFF_FORMAT_NAME;
3638 else if (!strcmp(arg, "--name-status"))
3639 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3640 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3641 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3642 else if (starts_with(arg, "--stat"))
3643 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3644 return stat_opt(options, av);
3645
3646 /* renames options */
3647 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3648 !strcmp(arg, "--break-rewrites")) {
3649 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3650 return error("invalid argument to -B: %s", arg+2);
3651 }
3652 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3653 !strcmp(arg, "--find-renames")) {
3654 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3655 return error("invalid argument to -M: %s", arg+2);
3656 options->detect_rename = DIFF_DETECT_RENAME;
3657 }
3658 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3659 options->irreversible_delete = 1;
3660 }
3661 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3662 !strcmp(arg, "--find-copies")) {
3663 if (options->detect_rename == DIFF_DETECT_COPY)
3664 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3665 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3666 return error("invalid argument to -C: %s", arg+2);
3667 options->detect_rename = DIFF_DETECT_COPY;
3668 }
3669 else if (!strcmp(arg, "--no-renames"))
3670 options->detect_rename = 0;
3671 else if (!strcmp(arg, "--rename-empty"))
3672 DIFF_OPT_SET(options, RENAME_EMPTY);
3673 else if (!strcmp(arg, "--no-rename-empty"))
3674 DIFF_OPT_CLR(options, RENAME_EMPTY);
3675 else if (!strcmp(arg, "--relative"))
3676 DIFF_OPT_SET(options, RELATIVE_NAME);
3677 else if (starts_with(arg, "--relative=")) {
3678 DIFF_OPT_SET(options, RELATIVE_NAME);
3679 options->prefix = arg + 11;
3680 }
3681
3682 /* xdiff options */
3683 else if (!strcmp(arg, "--minimal"))
3684 DIFF_XDL_SET(options, NEED_MINIMAL);
3685 else if (!strcmp(arg, "--no-minimal"))
3686 DIFF_XDL_CLR(options, NEED_MINIMAL);
3687 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3688 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3689 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3690 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3691 else if (!strcmp(arg, "--ignore-space-at-eol"))
3692 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3693 else if (!strcmp(arg, "--ignore-blank-lines"))
3694 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3695 else if (!strcmp(arg, "--patience"))
3696 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3697 else if (!strcmp(arg, "--histogram"))
3698 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3699 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3700 long value = parse_algorithm_value(optarg);
3701 if (value < 0)
3702 return error("option diff-algorithm accepts \"myers\", "
3703 "\"minimal\", \"patience\" and \"histogram\"");
3704 /* clear out previous settings */
3705 DIFF_XDL_CLR(options, NEED_MINIMAL);
3706 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3707 options->xdl_opts |= value;
3708 return argcount;
3709 }
3710
3711 /* flags options */
3712 else if (!strcmp(arg, "--binary")) {
3713 enable_patch_output(&options->output_format);
3714 DIFF_OPT_SET(options, BINARY);
3715 }
3716 else if (!strcmp(arg, "--full-index"))
3717 DIFF_OPT_SET(options, FULL_INDEX);
3718 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3719 DIFF_OPT_SET(options, TEXT);
3720 else if (!strcmp(arg, "-R"))
3721 DIFF_OPT_SET(options, REVERSE_DIFF);
3722 else if (!strcmp(arg, "--find-copies-harder"))
3723 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3724 else if (!strcmp(arg, "--follow"))
3725 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3726 else if (!strcmp(arg, "--no-follow"))
3727 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3728 else if (!strcmp(arg, "--color"))
3729 options->use_color = 1;
3730 else if (starts_with(arg, "--color=")) {
3731 int value = git_config_colorbool(NULL, arg+8);
3732 if (value < 0)
3733 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3734 options->use_color = value;
3735 }
3736 else if (!strcmp(arg, "--no-color"))
3737 options->use_color = 0;
3738 else if (!strcmp(arg, "--color-words")) {
3739 options->use_color = 1;
3740 options->word_diff = DIFF_WORDS_COLOR;
3741 }
3742 else if (starts_with(arg, "--color-words=")) {
3743 options->use_color = 1;
3744 options->word_diff = DIFF_WORDS_COLOR;
3745 options->word_regex = arg + 14;
3746 }
3747 else if (!strcmp(arg, "--word-diff")) {
3748 if (options->word_diff == DIFF_WORDS_NONE)
3749 options->word_diff = DIFF_WORDS_PLAIN;
3750 }
3751 else if (starts_with(arg, "--word-diff=")) {
3752 const char *type = arg + 12;
3753 if (!strcmp(type, "plain"))
3754 options->word_diff = DIFF_WORDS_PLAIN;
3755 else if (!strcmp(type, "color")) {
3756 options->use_color = 1;
3757 options->word_diff = DIFF_WORDS_COLOR;
3758 }
3759 else if (!strcmp(type, "porcelain"))
3760 options->word_diff = DIFF_WORDS_PORCELAIN;
3761 else if (!strcmp(type, "none"))
3762 options->word_diff = DIFF_WORDS_NONE;
3763 else
3764 die("bad --word-diff argument: %s", type);
3765 }
3766 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3767 if (options->word_diff == DIFF_WORDS_NONE)
3768 options->word_diff = DIFF_WORDS_PLAIN;
3769 options->word_regex = optarg;
3770 return argcount;
3771 }
3772 else if (!strcmp(arg, "--exit-code"))
3773 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3774 else if (!strcmp(arg, "--quiet"))
3775 DIFF_OPT_SET(options, QUICK);
3776 else if (!strcmp(arg, "--ext-diff"))
3777 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3778 else if (!strcmp(arg, "--no-ext-diff"))
3779 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3780 else if (!strcmp(arg, "--textconv"))
3781 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3782 else if (!strcmp(arg, "--no-textconv"))
3783 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3784 else if (!strcmp(arg, "--ignore-submodules")) {
3785 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3786 handle_ignore_submodules_arg(options, "all");
3787 } else if (starts_with(arg, "--ignore-submodules=")) {
3788 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3789 handle_ignore_submodules_arg(options, arg + 20);
3790 } else if (!strcmp(arg, "--submodule"))
3791 DIFF_OPT_SET(options, SUBMODULE_LOG);
3792 else if (starts_with(arg, "--submodule="))
3793 return parse_submodule_opt(options, arg + 12);
3794
3795 /* misc options */
3796 else if (!strcmp(arg, "-z"))
3797 options->line_termination = 0;
3798 else if ((argcount = short_opt('l', av, &optarg))) {
3799 options->rename_limit = strtoul(optarg, NULL, 10);
3800 return argcount;
3801 }
3802 else if ((argcount = short_opt('S', av, &optarg))) {
3803 options->pickaxe = optarg;
3804 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3805 return argcount;
3806 } else if ((argcount = short_opt('G', av, &optarg))) {
3807 options->pickaxe = optarg;
3808 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3809 return argcount;
3810 }
3811 else if (!strcmp(arg, "--pickaxe-all"))
3812 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3813 else if (!strcmp(arg, "--pickaxe-regex"))
3814 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3815 else if ((argcount = short_opt('O', av, &optarg))) {
3816 options->orderfile = optarg;
3817 return argcount;
3818 }
3819 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3820 int offending = parse_diff_filter_opt(optarg, options);
3821 if (offending)
3822 die("unknown change class '%c' in --diff-filter=%s",
3823 offending, optarg);
3824 return argcount;
3825 }
3826 else if (!strcmp(arg, "--abbrev"))
3827 options->abbrev = DEFAULT_ABBREV;
3828 else if (starts_with(arg, "--abbrev=")) {
3829 options->abbrev = strtoul(arg + 9, NULL, 10);
3830 if (options->abbrev < MINIMUM_ABBREV)
3831 options->abbrev = MINIMUM_ABBREV;
3832 else if (40 < options->abbrev)
3833 options->abbrev = 40;
3834 }
3835 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3836 options->a_prefix = optarg;
3837 return argcount;
3838 }
3839 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3840 options->b_prefix = optarg;
3841 return argcount;
3842 }
3843 else if (!strcmp(arg, "--no-prefix"))
3844 options->a_prefix = options->b_prefix = "";
3845 else if (opt_arg(arg, '\0', "inter-hunk-context",
3846 &options->interhunkcontext))
3847 ;
3848 else if (!strcmp(arg, "-W"))
3849 DIFF_OPT_SET(options, FUNCCONTEXT);
3850 else if (!strcmp(arg, "--function-context"))
3851 DIFF_OPT_SET(options, FUNCCONTEXT);
3852 else if (!strcmp(arg, "--no-function-context"))
3853 DIFF_OPT_CLR(options, FUNCCONTEXT);
3854 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3855 options->file = fopen(optarg, "w");
3856 if (!options->file)
3857 die_errno("Could not open '%s'", optarg);
3858 options->close_file = 1;
3859 return argcount;
3860 } else
3861 return 0;
3862 return 1;
3863 }
3864
3865 int parse_rename_score(const char **cp_p)
3866 {
3867 unsigned long num, scale;
3868 int ch, dot;
3869 const char *cp = *cp_p;
3870
3871 num = 0;
3872 scale = 1;
3873 dot = 0;
3874 for (;;) {
3875 ch = *cp;
3876 if ( !dot && ch == '.' ) {
3877 scale = 1;
3878 dot = 1;
3879 } else if ( ch == '%' ) {
3880 scale = dot ? scale*100 : 100;
3881 cp++; /* % is always at the end */
3882 break;
3883 } else if ( ch >= '0' && ch <= '9' ) {
3884 if ( scale < 100000 ) {
3885 scale *= 10;
3886 num = (num*10) + (ch-'0');
3887 }
3888 } else {
3889 break;
3890 }
3891 cp++;
3892 }
3893 *cp_p = cp;
3894
3895 /* user says num divided by scale and we say internally that
3896 * is MAX_SCORE * num / scale.
3897 */
3898 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3899 }
3900
3901 static int diff_scoreopt_parse(const char *opt)
3902 {
3903 int opt1, opt2, cmd;
3904
3905 if (*opt++ != '-')
3906 return -1;
3907 cmd = *opt++;
3908 if (cmd == '-') {
3909 /* convert the long-form arguments into short-form versions */
3910 if (starts_with(opt, "break-rewrites")) {
3911 opt += strlen("break-rewrites");
3912 if (*opt == 0 || *opt++ == '=')
3913 cmd = 'B';
3914 } else if (starts_with(opt, "find-copies")) {
3915 opt += strlen("find-copies");
3916 if (*opt == 0 || *opt++ == '=')
3917 cmd = 'C';
3918 } else if (starts_with(opt, "find-renames")) {
3919 opt += strlen("find-renames");
3920 if (*opt == 0 || *opt++ == '=')
3921 cmd = 'M';
3922 }
3923 }
3924 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3925 return -1; /* that is not a -M, -C nor -B option */
3926
3927 opt1 = parse_rename_score(&opt);
3928 if (cmd != 'B')
3929 opt2 = 0;
3930 else {
3931 if (*opt == 0)
3932 opt2 = 0;
3933 else if (*opt != '/')
3934 return -1; /* we expect -B80/99 or -B80 */
3935 else {
3936 opt++;
3937 opt2 = parse_rename_score(&opt);
3938 }
3939 }
3940 if (*opt != 0)
3941 return -1;
3942 return opt1 | (opt2 << 16);
3943 }
3944
3945 struct diff_queue_struct diff_queued_diff;
3946
3947 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3948 {
3949 if (queue->alloc <= queue->nr) {
3950 queue->alloc = alloc_nr(queue->alloc);
3951 queue->queue = xrealloc(queue->queue,
3952 sizeof(dp) * queue->alloc);
3953 }
3954 queue->queue[queue->nr++] = dp;
3955 }
3956
3957 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3958 struct diff_filespec *one,
3959 struct diff_filespec *two)
3960 {
3961 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3962 dp->one = one;
3963 dp->two = two;
3964 if (queue)
3965 diff_q(queue, dp);
3966 return dp;
3967 }
3968
3969 void diff_free_filepair(struct diff_filepair *p)
3970 {
3971 free_filespec(p->one);
3972 free_filespec(p->two);
3973 free(p);
3974 }
3975
3976 /* This is different from find_unique_abbrev() in that
3977 * it stuffs the result with dots for alignment.
3978 */
3979 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3980 {
3981 int abblen;
3982 const char *abbrev;
3983 if (len == 40)
3984 return sha1_to_hex(sha1);
3985
3986 abbrev = find_unique_abbrev(sha1, len);
3987 abblen = strlen(abbrev);
3988 if (abblen < 37) {
3989 static char hex[41];
3990 if (len < abblen && abblen <= len + 2)
3991 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3992 else
3993 sprintf(hex, "%s...", abbrev);
3994 return hex;
3995 }
3996 return sha1_to_hex(sha1);
3997 }
3998
3999 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4000 {
4001 int line_termination = opt->line_termination;
4002 int inter_name_termination = line_termination ? '\t' : '\0';
4003
4004 fprintf(opt->file, "%s", diff_line_prefix(opt));
4005 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4006 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4007 diff_unique_abbrev(p->one->sha1, opt->abbrev));
4008 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
4009 }
4010 if (p->score) {
4011 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4012 inter_name_termination);
4013 } else {
4014 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4015 }
4016
4017 if (p->status == DIFF_STATUS_COPIED ||
4018 p->status == DIFF_STATUS_RENAMED) {
4019 const char *name_a, *name_b;
4020 name_a = p->one->path;
4021 name_b = p->two->path;
4022 strip_prefix(opt->prefix_length, &name_a, &name_b);
4023 write_name_quoted(name_a, opt->file, inter_name_termination);
4024 write_name_quoted(name_b, opt->file, line_termination);
4025 } else {
4026 const char *name_a, *name_b;
4027 name_a = p->one->mode ? p->one->path : p->two->path;
4028 name_b = NULL;
4029 strip_prefix(opt->prefix_length, &name_a, &name_b);
4030 write_name_quoted(name_a, opt->file, line_termination);
4031 }
4032 }
4033
4034 int diff_unmodified_pair(struct diff_filepair *p)
4035 {
4036 /* This function is written stricter than necessary to support
4037 * the currently implemented transformers, but the idea is to
4038 * let transformers to produce diff_filepairs any way they want,
4039 * and filter and clean them up here before producing the output.
4040 */
4041 struct diff_filespec *one = p->one, *two = p->two;
4042
4043 if (DIFF_PAIR_UNMERGED(p))
4044 return 0; /* unmerged is interesting */
4045
4046 /* deletion, addition, mode or type change
4047 * and rename are all interesting.
4048 */
4049 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4050 DIFF_PAIR_MODE_CHANGED(p) ||
4051 strcmp(one->path, two->path))
4052 return 0;
4053
4054 /* both are valid and point at the same path. that is, we are
4055 * dealing with a change.
4056 */
4057 if (one->sha1_valid && two->sha1_valid &&
4058 !hashcmp(one->sha1, two->sha1) &&
4059 !one->dirty_submodule && !two->dirty_submodule)
4060 return 1; /* no change */
4061 if (!one->sha1_valid && !two->sha1_valid)
4062 return 1; /* both look at the same file on the filesystem. */
4063 return 0;
4064 }
4065
4066 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4067 {
4068 if (diff_unmodified_pair(p))
4069 return;
4070
4071 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4072 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4073 return; /* no tree diffs in patch format */
4074
4075 run_diff(p, o);
4076 }
4077
4078 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4079 struct diffstat_t *diffstat)
4080 {
4081 if (diff_unmodified_pair(p))
4082 return;
4083
4084 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4085 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4086 return; /* no useful stat for tree diffs */
4087
4088 run_diffstat(p, o, diffstat);
4089 }
4090
4091 static void diff_flush_checkdiff(struct diff_filepair *p,
4092 struct diff_options *o)
4093 {
4094 if (diff_unmodified_pair(p))
4095 return;
4096
4097 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4098 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4099 return; /* nothing to check in tree diffs */
4100
4101 run_checkdiff(p, o);
4102 }
4103
4104 int diff_queue_is_empty(void)
4105 {
4106 struct diff_queue_struct *q = &diff_queued_diff;
4107 int i;
4108 for (i = 0; i < q->nr; i++)
4109 if (!diff_unmodified_pair(q->queue[i]))
4110 return 0;
4111 return 1;
4112 }
4113
4114 #if DIFF_DEBUG
4115 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4116 {
4117 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4118 x, one ? one : "",
4119 s->path,
4120 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4121 s->mode,
4122 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4123 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
4124 x, one ? one : "",
4125 s->size, s->xfrm_flags);
4126 }
4127
4128 void diff_debug_filepair(const struct diff_filepair *p, int i)
4129 {
4130 diff_debug_filespec(p->one, i, "one");
4131 diff_debug_filespec(p->two, i, "two");
4132 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4133 p->score, p->status ? p->status : '?',
4134 p->one->rename_used, p->broken_pair);
4135 }
4136
4137 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4138 {
4139 int i;
4140 if (msg)
4141 fprintf(stderr, "%s\n", msg);
4142 fprintf(stderr, "q->nr = %d\n", q->nr);
4143 for (i = 0; i < q->nr; i++) {
4144 struct diff_filepair *p = q->queue[i];
4145 diff_debug_filepair(p, i);
4146 }
4147 }
4148 #endif
4149
4150 static void diff_resolve_rename_copy(void)
4151 {
4152 int i;
4153 struct diff_filepair *p;
4154 struct diff_queue_struct *q = &diff_queued_diff;
4155
4156 diff_debug_queue("resolve-rename-copy", q);
4157
4158 for (i = 0; i < q->nr; i++) {
4159 p = q->queue[i];
4160 p->status = 0; /* undecided */
4161 if (DIFF_PAIR_UNMERGED(p))
4162 p->status = DIFF_STATUS_UNMERGED;
4163 else if (!DIFF_FILE_VALID(p->one))
4164 p->status = DIFF_STATUS_ADDED;
4165 else if (!DIFF_FILE_VALID(p->two))
4166 p->status = DIFF_STATUS_DELETED;
4167 else if (DIFF_PAIR_TYPE_CHANGED(p))
4168 p->status = DIFF_STATUS_TYPE_CHANGED;
4169
4170 /* from this point on, we are dealing with a pair
4171 * whose both sides are valid and of the same type, i.e.
4172 * either in-place edit or rename/copy edit.
4173 */
4174 else if (DIFF_PAIR_RENAME(p)) {
4175 /*
4176 * A rename might have re-connected a broken
4177 * pair up, causing the pathnames to be the
4178 * same again. If so, that's not a rename at
4179 * all, just a modification..
4180 *
4181 * Otherwise, see if this source was used for
4182 * multiple renames, in which case we decrement
4183 * the count, and call it a copy.
4184 */
4185 if (!strcmp(p->one->path, p->two->path))
4186 p->status = DIFF_STATUS_MODIFIED;
4187 else if (--p->one->rename_used > 0)
4188 p->status = DIFF_STATUS_COPIED;
4189 else
4190 p->status = DIFF_STATUS_RENAMED;
4191 }
4192 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4193 p->one->mode != p->two->mode ||
4194 p->one->dirty_submodule ||
4195 p->two->dirty_submodule ||
4196 is_null_sha1(p->one->sha1))
4197 p->status = DIFF_STATUS_MODIFIED;
4198 else {
4199 /* This is a "no-change" entry and should not
4200 * happen anymore, but prepare for broken callers.
4201 */
4202 error("feeding unmodified %s to diffcore",
4203 p->one->path);
4204 p->status = DIFF_STATUS_UNKNOWN;
4205 }
4206 }
4207 diff_debug_queue("resolve-rename-copy done", q);
4208 }
4209
4210 static int check_pair_status(struct diff_filepair *p)
4211 {
4212 switch (p->status) {
4213 case DIFF_STATUS_UNKNOWN:
4214 return 0;
4215 case 0:
4216 die("internal error in diff-resolve-rename-copy");
4217 default:
4218 return 1;
4219 }
4220 }
4221
4222 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4223 {
4224 int fmt = opt->output_format;
4225
4226 if (fmt & DIFF_FORMAT_CHECKDIFF)
4227 diff_flush_checkdiff(p, opt);
4228 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4229 diff_flush_raw(p, opt);
4230 else if (fmt & DIFF_FORMAT_NAME) {
4231 const char *name_a, *name_b;
4232 name_a = p->two->path;
4233 name_b = NULL;
4234 strip_prefix(opt->prefix_length, &name_a, &name_b);
4235 write_name_quoted(name_a, opt->file, opt->line_termination);
4236 }
4237 }
4238
4239 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4240 {
4241 if (fs->mode)
4242 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4243 else
4244 fprintf(file, " %s ", newdelete);
4245 write_name_quoted(fs->path, file, '\n');
4246 }
4247
4248
4249 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4250 const char *line_prefix)
4251 {
4252 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4253 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4254 p->two->mode, show_name ? ' ' : '\n');
4255 if (show_name) {
4256 write_name_quoted(p->two->path, file, '\n');
4257 }
4258 }
4259 }
4260
4261 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4262 const char *line_prefix)
4263 {
4264 char *names = pprint_rename(p->one->path, p->two->path);
4265
4266 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4267 free(names);
4268 show_mode_change(file, p, 0, line_prefix);
4269 }
4270
4271 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4272 {
4273 FILE *file = opt->file;
4274 const char *line_prefix = diff_line_prefix(opt);
4275
4276 switch(p->status) {
4277 case DIFF_STATUS_DELETED:
4278 fputs(line_prefix, file);
4279 show_file_mode_name(file, "delete", p->one);
4280 break;
4281 case DIFF_STATUS_ADDED:
4282 fputs(line_prefix, file);
4283 show_file_mode_name(file, "create", p->two);
4284 break;
4285 case DIFF_STATUS_COPIED:
4286 fputs(line_prefix, file);
4287 show_rename_copy(file, "copy", p, line_prefix);
4288 break;
4289 case DIFF_STATUS_RENAMED:
4290 fputs(line_prefix, file);
4291 show_rename_copy(file, "rename", p, line_prefix);
4292 break;
4293 default:
4294 if (p->score) {
4295 fprintf(file, "%s rewrite ", line_prefix);
4296 write_name_quoted(p->two->path, file, ' ');
4297 fprintf(file, "(%d%%)\n", similarity_index(p));
4298 }
4299 show_mode_change(file, p, !p->score, line_prefix);
4300 break;
4301 }
4302 }
4303
4304 struct patch_id_t {
4305 git_SHA_CTX *ctx;
4306 int patchlen;
4307 };
4308
4309 static int remove_space(char *line, int len)
4310 {
4311 int i;
4312 char *dst = line;
4313 unsigned char c;
4314
4315 for (i = 0; i < len; i++)
4316 if (!isspace((c = line[i])))
4317 *dst++ = c;
4318
4319 return dst - line;
4320 }
4321
4322 static void patch_id_consume(void *priv, char *line, unsigned long len)
4323 {
4324 struct patch_id_t *data = priv;
4325 int new_len;
4326
4327 /* Ignore line numbers when computing the SHA1 of the patch */
4328 if (starts_with(line, "@@ -"))
4329 return;
4330
4331 new_len = remove_space(line, len);
4332
4333 git_SHA1_Update(data->ctx, line, new_len);
4334 data->patchlen += new_len;
4335 }
4336
4337 /* returns 0 upon success, and writes result into sha1 */
4338 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4339 {
4340 struct diff_queue_struct *q = &diff_queued_diff;
4341 int i;
4342 git_SHA_CTX ctx;
4343 struct patch_id_t data;
4344 char buffer[PATH_MAX * 4 + 20];
4345
4346 git_SHA1_Init(&ctx);
4347 memset(&data, 0, sizeof(struct patch_id_t));
4348 data.ctx = &ctx;
4349
4350 for (i = 0; i < q->nr; i++) {
4351 xpparam_t xpp;
4352 xdemitconf_t xecfg;
4353 mmfile_t mf1, mf2;
4354 struct diff_filepair *p = q->queue[i];
4355 int len1, len2;
4356
4357 memset(&xpp, 0, sizeof(xpp));
4358 memset(&xecfg, 0, sizeof(xecfg));
4359 if (p->status == 0)
4360 return error("internal diff status error");
4361 if (p->status == DIFF_STATUS_UNKNOWN)
4362 continue;
4363 if (diff_unmodified_pair(p))
4364 continue;
4365 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4366 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4367 continue;
4368 if (DIFF_PAIR_UNMERGED(p))
4369 continue;
4370
4371 diff_fill_sha1_info(p->one);
4372 diff_fill_sha1_info(p->two);
4373 if (fill_mmfile(&mf1, p->one) < 0 ||
4374 fill_mmfile(&mf2, p->two) < 0)
4375 return error("unable to read files to diff");
4376
4377 len1 = remove_space(p->one->path, strlen(p->one->path));
4378 len2 = remove_space(p->two->path, strlen(p->two->path));
4379 if (p->one->mode == 0)
4380 len1 = snprintf(buffer, sizeof(buffer),
4381 "diff--gita/%.*sb/%.*s"
4382 "newfilemode%06o"
4383 "---/dev/null"
4384 "+++b/%.*s",
4385 len1, p->one->path,
4386 len2, p->two->path,
4387 p->two->mode,
4388 len2, p->two->path);
4389 else if (p->two->mode == 0)
4390 len1 = snprintf(buffer, sizeof(buffer),
4391 "diff--gita/%.*sb/%.*s"
4392 "deletedfilemode%06o"
4393 "---a/%.*s"
4394 "+++/dev/null",
4395 len1, p->one->path,
4396 len2, p->two->path,
4397 p->one->mode,
4398 len1, p->one->path);
4399 else
4400 len1 = snprintf(buffer, sizeof(buffer),
4401 "diff--gita/%.*sb/%.*s"
4402 "---a/%.*s"
4403 "+++b/%.*s",
4404 len1, p->one->path,
4405 len2, p->two->path,
4406 len1, p->one->path,
4407 len2, p->two->path);
4408 git_SHA1_Update(&ctx, buffer, len1);
4409
4410 if (diff_filespec_is_binary(p->one) ||
4411 diff_filespec_is_binary(p->two)) {
4412 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4413 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4414 continue;
4415 }
4416
4417 xpp.flags = 0;
4418 xecfg.ctxlen = 3;
4419 xecfg.flags = 0;
4420 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4421 &xpp, &xecfg);
4422 }
4423
4424 git_SHA1_Final(sha1, &ctx);
4425 return 0;
4426 }
4427
4428 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4429 {
4430 struct diff_queue_struct *q = &diff_queued_diff;
4431 int i;
4432 int result = diff_get_patch_id(options, sha1);
4433
4434 for (i = 0; i < q->nr; i++)
4435 diff_free_filepair(q->queue[i]);
4436
4437 free(q->queue);
4438 DIFF_QUEUE_CLEAR(q);
4439
4440 return result;
4441 }
4442
4443 static int is_summary_empty(const struct diff_queue_struct *q)
4444 {
4445 int i;
4446
4447 for (i = 0; i < q->nr; i++) {
4448 const struct diff_filepair *p = q->queue[i];
4449
4450 switch (p->status) {
4451 case DIFF_STATUS_DELETED:
4452 case DIFF_STATUS_ADDED:
4453 case DIFF_STATUS_COPIED:
4454 case DIFF_STATUS_RENAMED:
4455 return 0;
4456 default:
4457 if (p->score)
4458 return 0;
4459 if (p->one->mode && p->two->mode &&
4460 p->one->mode != p->two->mode)
4461 return 0;
4462 break;
4463 }
4464 }
4465 return 1;
4466 }
4467
4468 static const char rename_limit_warning[] =
4469 "inexact rename detection was skipped due to too many files.";
4470
4471 static const char degrade_cc_to_c_warning[] =
4472 "only found copies from modified paths due to too many files.";
4473
4474 static const char rename_limit_advice[] =
4475 "you may want to set your %s variable to at least "
4476 "%d and retry the command.";
4477
4478 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4479 {
4480 if (degraded_cc)
4481 warning(degrade_cc_to_c_warning);
4482 else if (needed)
4483 warning(rename_limit_warning);
4484 else
4485 return;
4486 if (0 < needed && needed < 32767)
4487 warning(rename_limit_advice, varname, needed);
4488 }
4489
4490 void diff_flush(struct diff_options *options)
4491 {
4492 struct diff_queue_struct *q = &diff_queued_diff;
4493 int i, output_format = options->output_format;
4494 int separator = 0;
4495 int dirstat_by_line = 0;
4496
4497 /*
4498 * Order: raw, stat, summary, patch
4499 * or: name/name-status/checkdiff (other bits clear)
4500 */
4501 if (!q->nr)
4502 goto free_queue;
4503
4504 if (output_format & (DIFF_FORMAT_RAW |
4505 DIFF_FORMAT_NAME |
4506 DIFF_FORMAT_NAME_STATUS |
4507 DIFF_FORMAT_CHECKDIFF)) {
4508 for (i = 0; i < q->nr; i++) {
4509 struct diff_filepair *p = q->queue[i];
4510 if (check_pair_status(p))
4511 flush_one_pair(p, options);
4512 }
4513 separator++;
4514 }
4515
4516 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4517 dirstat_by_line = 1;
4518
4519 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4520 dirstat_by_line) {
4521 struct diffstat_t diffstat;
4522
4523 memset(&diffstat, 0, sizeof(struct diffstat_t));
4524 for (i = 0; i < q->nr; i++) {
4525 struct diff_filepair *p = q->queue[i];
4526 if (check_pair_status(p))
4527 diff_flush_stat(p, options, &diffstat);
4528 }
4529 if (output_format & DIFF_FORMAT_NUMSTAT)
4530 show_numstat(&diffstat, options);
4531 if (output_format & DIFF_FORMAT_DIFFSTAT)
4532 show_stats(&diffstat, options);
4533 if (output_format & DIFF_FORMAT_SHORTSTAT)
4534 show_shortstats(&diffstat, options);
4535 if (output_format & DIFF_FORMAT_DIRSTAT)
4536 show_dirstat_by_line(&diffstat, options);
4537 free_diffstat_info(&diffstat);
4538 separator++;
4539 }
4540 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4541 show_dirstat(options);
4542
4543 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4544 for (i = 0; i < q->nr; i++) {
4545 diff_summary(options, q->queue[i]);
4546 }
4547 separator++;
4548 }
4549
4550 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4551 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4552 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4553 /*
4554 * run diff_flush_patch for the exit status. setting
4555 * options->file to /dev/null should be safe, because we
4556 * aren't supposed to produce any output anyway.
4557 */
4558 if (options->close_file)
4559 fclose(options->file);
4560 options->file = fopen("/dev/null", "w");
4561 if (!options->file)
4562 die_errno("Could not open /dev/null");
4563 options->close_file = 1;
4564 for (i = 0; i < q->nr; i++) {
4565 struct diff_filepair *p = q->queue[i];
4566 if (check_pair_status(p))
4567 diff_flush_patch(p, options);
4568 if (options->found_changes)
4569 break;
4570 }
4571 }
4572
4573 if (output_format & DIFF_FORMAT_PATCH) {
4574 if (separator) {
4575 fprintf(options->file, "%s%c",
4576 diff_line_prefix(options),
4577 options->line_termination);
4578 if (options->stat_sep) {
4579 /* attach patch instead of inline */
4580 fputs(options->stat_sep, options->file);
4581 }
4582 }
4583
4584 for (i = 0; i < q->nr; i++) {
4585 struct diff_filepair *p = q->queue[i];
4586 if (check_pair_status(p))
4587 diff_flush_patch(p, options);
4588 }
4589 }
4590
4591 if (output_format & DIFF_FORMAT_CALLBACK)
4592 options->format_callback(q, options, options->format_callback_data);
4593
4594 for (i = 0; i < q->nr; i++)
4595 diff_free_filepair(q->queue[i]);
4596 free_queue:
4597 free(q->queue);
4598 DIFF_QUEUE_CLEAR(q);
4599 if (options->close_file)
4600 fclose(options->file);
4601
4602 /*
4603 * Report the content-level differences with HAS_CHANGES;
4604 * diff_addremove/diff_change does not set the bit when
4605 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4606 */
4607 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4608 if (options->found_changes)
4609 DIFF_OPT_SET(options, HAS_CHANGES);
4610 else
4611 DIFF_OPT_CLR(options, HAS_CHANGES);
4612 }
4613 }
4614
4615 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4616 {
4617 return (((p->status == DIFF_STATUS_MODIFIED) &&
4618 ((p->score &&
4619 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4620 (!p->score &&
4621 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4622 ((p->status != DIFF_STATUS_MODIFIED) &&
4623 filter_bit_tst(p->status, options)));
4624 }
4625
4626 static void diffcore_apply_filter(struct diff_options *options)
4627 {
4628 int i;
4629 struct diff_queue_struct *q = &diff_queued_diff;
4630 struct diff_queue_struct outq;
4631
4632 DIFF_QUEUE_CLEAR(&outq);
4633
4634 if (!options->filter)
4635 return;
4636
4637 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4638 int found;
4639 for (i = found = 0; !found && i < q->nr; i++) {
4640 if (match_filter(options, q->queue[i]))
4641 found++;
4642 }
4643 if (found)
4644 return;
4645
4646 /* otherwise we will clear the whole queue
4647 * by copying the empty outq at the end of this
4648 * function, but first clear the current entries
4649 * in the queue.
4650 */
4651 for (i = 0; i < q->nr; i++)
4652 diff_free_filepair(q->queue[i]);
4653 }
4654 else {
4655 /* Only the matching ones */
4656 for (i = 0; i < q->nr; i++) {
4657 struct diff_filepair *p = q->queue[i];
4658 if (match_filter(options, p))
4659 diff_q(&outq, p);
4660 else
4661 diff_free_filepair(p);
4662 }
4663 }
4664 free(q->queue);
4665 *q = outq;
4666 }
4667
4668 /* Check whether two filespecs with the same mode and size are identical */
4669 static int diff_filespec_is_identical(struct diff_filespec *one,
4670 struct diff_filespec *two)
4671 {
4672 if (S_ISGITLINK(one->mode))
4673 return 0;
4674 if (diff_populate_filespec(one, 0))
4675 return 0;
4676 if (diff_populate_filespec(two, 0))
4677 return 0;
4678 return !memcmp(one->data, two->data, one->size);
4679 }
4680
4681 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4682 {
4683 int i;
4684 struct diff_queue_struct *q = &diff_queued_diff;
4685 struct diff_queue_struct outq;
4686 DIFF_QUEUE_CLEAR(&outq);
4687
4688 for (i = 0; i < q->nr; i++) {
4689 struct diff_filepair *p = q->queue[i];
4690
4691 /*
4692 * 1. Entries that come from stat info dirtiness
4693 * always have both sides (iow, not create/delete),
4694 * one side of the object name is unknown, with
4695 * the same mode and size. Keep the ones that
4696 * do not match these criteria. They have real
4697 * differences.
4698 *
4699 * 2. At this point, the file is known to be modified,
4700 * with the same mode and size, and the object
4701 * name of one side is unknown. Need to inspect
4702 * the identical contents.
4703 */
4704 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4705 !DIFF_FILE_VALID(p->two) ||
4706 (p->one->sha1_valid && p->two->sha1_valid) ||
4707 (p->one->mode != p->two->mode) ||
4708 diff_populate_filespec(p->one, 1) ||
4709 diff_populate_filespec(p->two, 1) ||
4710 (p->one->size != p->two->size) ||
4711 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4712 diff_q(&outq, p);
4713 else {
4714 /*
4715 * The caller can subtract 1 from skip_stat_unmatch
4716 * to determine how many paths were dirty only
4717 * due to stat info mismatch.
4718 */
4719 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4720 diffopt->skip_stat_unmatch++;
4721 diff_free_filepair(p);
4722 }
4723 }
4724 free(q->queue);
4725 *q = outq;
4726 }
4727
4728 static int diffnamecmp(const void *a_, const void *b_)
4729 {
4730 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4731 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4732 const char *name_a, *name_b;
4733
4734 name_a = a->one ? a->one->path : a->two->path;
4735 name_b = b->one ? b->one->path : b->two->path;
4736 return strcmp(name_a, name_b);
4737 }
4738
4739 void diffcore_fix_diff_index(struct diff_options *options)
4740 {
4741 struct diff_queue_struct *q = &diff_queued_diff;
4742 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4743 }
4744
4745 void diffcore_std(struct diff_options *options)
4746 {
4747 if (options->skip_stat_unmatch)
4748 diffcore_skip_stat_unmatch(options);
4749 if (!options->found_follow) {
4750 /* See try_to_follow_renames() in tree-diff.c */
4751 if (options->break_opt != -1)
4752 diffcore_break(options->break_opt);
4753 if (options->detect_rename)
4754 diffcore_rename(options);
4755 if (options->break_opt != -1)
4756 diffcore_merge_broken();
4757 }
4758 if (options->pickaxe)
4759 diffcore_pickaxe(options);
4760 if (options->orderfile)
4761 diffcore_order(options->orderfile);
4762 if (!options->found_follow)
4763 /* See try_to_follow_renames() in tree-diff.c */
4764 diff_resolve_rename_copy();
4765 diffcore_apply_filter(options);
4766
4767 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4768 DIFF_OPT_SET(options, HAS_CHANGES);
4769 else
4770 DIFF_OPT_CLR(options, HAS_CHANGES);
4771
4772 options->found_follow = 0;
4773 }
4774
4775 int diff_result_code(struct diff_options *opt, int status)
4776 {
4777 int result = 0;
4778
4779 diff_warn_rename_limit("diff.renameLimit",
4780 opt->needed_rename_limit,
4781 opt->degraded_cc_to_c);
4782 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4783 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4784 return status;
4785 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4786 DIFF_OPT_TST(opt, HAS_CHANGES))
4787 result |= 01;
4788 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4789 DIFF_OPT_TST(opt, CHECK_FAILED))
4790 result |= 02;
4791 return result;
4792 }
4793
4794 int diff_can_quit_early(struct diff_options *opt)
4795 {
4796 return (DIFF_OPT_TST(opt, QUICK) &&
4797 !opt->filter &&
4798 DIFF_OPT_TST(opt, HAS_CHANGES));
4799 }
4800
4801 /*
4802 * Shall changes to this submodule be ignored?
4803 *
4804 * Submodule changes can be configured to be ignored separately for each path,
4805 * but that configuration can be overridden from the command line.
4806 */
4807 static int is_submodule_ignored(const char *path, struct diff_options *options)
4808 {
4809 int ignored = 0;
4810 unsigned orig_flags = options->flags;
4811 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4812 set_diffopt_flags_from_submodule_config(options, path);
4813 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4814 ignored = 1;
4815 options->flags = orig_flags;
4816 return ignored;
4817 }
4818
4819 void diff_addremove(struct diff_options *options,
4820 int addremove, unsigned mode,
4821 const unsigned char *sha1,
4822 int sha1_valid,
4823 const char *concatpath, unsigned dirty_submodule)
4824 {
4825 struct diff_filespec *one, *two;
4826
4827 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4828 return;
4829
4830 /* This may look odd, but it is a preparation for
4831 * feeding "there are unchanged files which should
4832 * not produce diffs, but when you are doing copy
4833 * detection you would need them, so here they are"
4834 * entries to the diff-core. They will be prefixed
4835 * with something like '=' or '*' (I haven't decided
4836 * which but should not make any difference).
4837 * Feeding the same new and old to diff_change()
4838 * also has the same effect.
4839 * Before the final output happens, they are pruned after
4840 * merged into rename/copy pairs as appropriate.
4841 */
4842 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4843 addremove = (addremove == '+' ? '-' :
4844 addremove == '-' ? '+' : addremove);
4845
4846 if (options->prefix &&
4847 strncmp(concatpath, options->prefix, options->prefix_length))
4848 return;
4849
4850 one = alloc_filespec(concatpath);
4851 two = alloc_filespec(concatpath);
4852
4853 if (addremove != '+')
4854 fill_filespec(one, sha1, sha1_valid, mode);
4855 if (addremove != '-') {
4856 fill_filespec(two, sha1, sha1_valid, mode);
4857 two->dirty_submodule = dirty_submodule;
4858 }
4859
4860 diff_queue(&diff_queued_diff, one, two);
4861 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4862 DIFF_OPT_SET(options, HAS_CHANGES);
4863 }
4864
4865 void diff_change(struct diff_options *options,
4866 unsigned old_mode, unsigned new_mode,
4867 const unsigned char *old_sha1,
4868 const unsigned char *new_sha1,
4869 int old_sha1_valid, int new_sha1_valid,
4870 const char *concatpath,
4871 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4872 {
4873 struct diff_filespec *one, *two;
4874
4875 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4876 is_submodule_ignored(concatpath, options))
4877 return;
4878
4879 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4880 unsigned tmp;
4881 const unsigned char *tmp_c;
4882 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4883 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4884 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4885 new_sha1_valid = tmp;
4886 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4887 new_dirty_submodule = tmp;
4888 }
4889
4890 if (options->prefix &&
4891 strncmp(concatpath, options->prefix, options->prefix_length))
4892 return;
4893
4894 one = alloc_filespec(concatpath);
4895 two = alloc_filespec(concatpath);
4896 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4897 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4898 one->dirty_submodule = old_dirty_submodule;
4899 two->dirty_submodule = new_dirty_submodule;
4900
4901 diff_queue(&diff_queued_diff, one, two);
4902 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4903 DIFF_OPT_SET(options, HAS_CHANGES);
4904 }
4905
4906 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4907 {
4908 struct diff_filepair *pair;
4909 struct diff_filespec *one, *two;
4910
4911 if (options->prefix &&
4912 strncmp(path, options->prefix, options->prefix_length))
4913 return NULL;
4914
4915 one = alloc_filespec(path);
4916 two = alloc_filespec(path);
4917 pair = diff_queue(&diff_queued_diff, one, two);
4918 pair->is_unmerged = 1;
4919 return pair;
4920 }
4921
4922 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4923 size_t *outsize)
4924 {
4925 struct diff_tempfile *temp;
4926 const char *argv[3];
4927 const char **arg = argv;
4928 struct child_process child;
4929 struct strbuf buf = STRBUF_INIT;
4930 int err = 0;
4931
4932 temp = prepare_temp_file(spec->path, spec);
4933 *arg++ = pgm;
4934 *arg++ = temp->name;
4935 *arg = NULL;
4936
4937 memset(&child, 0, sizeof(child));
4938 child.use_shell = 1;
4939 child.argv = argv;
4940 child.out = -1;
4941 if (start_command(&child)) {
4942 remove_tempfile();
4943 return NULL;
4944 }
4945
4946 if (strbuf_read(&buf, child.out, 0) < 0)
4947 err = error("error reading from textconv command '%s'", pgm);
4948 close(child.out);
4949
4950 if (finish_command(&child) || err) {
4951 strbuf_release(&buf);
4952 remove_tempfile();
4953 return NULL;
4954 }
4955 remove_tempfile();
4956
4957 return strbuf_detach(&buf, outsize);
4958 }
4959
4960 size_t fill_textconv(struct userdiff_driver *driver,
4961 struct diff_filespec *df,
4962 char **outbuf)
4963 {
4964 size_t size;
4965
4966 if (!driver || !driver->textconv) {
4967 if (!DIFF_FILE_VALID(df)) {
4968 *outbuf = "";
4969 return 0;
4970 }
4971 if (diff_populate_filespec(df, 0))
4972 die("unable to read files to diff");
4973 *outbuf = df->data;
4974 return df->size;
4975 }
4976
4977 if (driver->textconv_cache && df->sha1_valid) {
4978 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4979 &size);
4980 if (*outbuf)
4981 return size;
4982 }
4983
4984 *outbuf = run_textconv(driver->textconv, df, &size);
4985 if (!*outbuf)
4986 die("unable to read files to diff");
4987
4988 if (driver->textconv_cache && df->sha1_valid) {
4989 /* ignore errors, as we might be in a readonly repository */
4990 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4991 size);
4992 /*
4993 * we could save up changes and flush them all at the end,
4994 * but we would need an extra call after all diffing is done.
4995 * Since generating a cache entry is the slow path anyway,
4996 * this extra overhead probably isn't a big deal.
4997 */
4998 notes_cache_write(driver->textconv_cache);
4999 }
5000
5001 return size;
5002 }
5003
5004 void setup_diff_pager(struct diff_options *opt)
5005 {
5006 /*
5007 * If the user asked for our exit code, then either they want --quiet
5008 * or --exit-code. We should definitely not bother with a pager in the
5009 * former case, as we will generate no output. Since we still properly
5010 * report our exit code even when a pager is run, we _could_ run a
5011 * pager with --exit-code. But since we have not done so historically,
5012 * and because it is easy to find people oneline advising "git diff
5013 * --exit-code" in hooks and other scripts, we do not do so.
5014 */
5015 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5016 check_pager_config("diff") != 0)
5017 setup_pager();
5018 }
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