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Merge branch 'cb/byte-order'
[git/gitweb.git] / diff.c
blobde25819e4edede0a24ee30b202dee478165b4fed
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 #include "argv-array.h"
20
21 #ifdef NO_FAST_WORKING_DIRECTORY
22 #define FAST_WORKING_DIRECTORY 0
23 #else
24 #define FAST_WORKING_DIRECTORY 1
25 #endif
26
27 static int diff_detect_rename_default;
28 static int diff_rename_limit_default = 400;
29 static int diff_suppress_blank_empty;
30 static int diff_use_color_default = -1;
31 static int diff_context_default = 3;
32 static const char *diff_word_regex_cfg;
33 static const char *external_diff_cmd_cfg;
34 static const char *diff_order_file_cfg;
35 int diff_auto_refresh_index = 1;
36 static int diff_mnemonic_prefix;
37 static int diff_no_prefix;
38 static int diff_stat_graph_width;
39 static int diff_dirstat_permille_default = 30;
40 static struct diff_options default_diff_options;
41 static long diff_algorithm;
42
43 static char diff_colors[][COLOR_MAXLEN] = {
44 GIT_COLOR_RESET,
45 GIT_COLOR_NORMAL, /* PLAIN */
46 GIT_COLOR_BOLD, /* METAINFO */
47 GIT_COLOR_CYAN, /* FRAGINFO */
48 GIT_COLOR_RED, /* OLD */
49 GIT_COLOR_GREEN, /* NEW */
50 GIT_COLOR_YELLOW, /* COMMIT */
51 GIT_COLOR_BG_RED, /* WHITESPACE */
52 GIT_COLOR_NORMAL, /* FUNCINFO */
53 };
54
55 static int parse_diff_color_slot(const char *var, int ofs)
56 {
57 if (!strcasecmp(var+ofs, "plain"))
58 return DIFF_PLAIN;
59 if (!strcasecmp(var+ofs, "meta"))
60 return DIFF_METAINFO;
61 if (!strcasecmp(var+ofs, "frag"))
62 return DIFF_FRAGINFO;
63 if (!strcasecmp(var+ofs, "old"))
64 return DIFF_FILE_OLD;
65 if (!strcasecmp(var+ofs, "new"))
66 return DIFF_FILE_NEW;
67 if (!strcasecmp(var+ofs, "commit"))
68 return DIFF_COMMIT;
69 if (!strcasecmp(var+ofs, "whitespace"))
70 return DIFF_WHITESPACE;
71 if (!strcasecmp(var+ofs, "func"))
72 return DIFF_FUNCINFO;
73 return -1;
74 }
75
76 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
77 struct strbuf *errmsg)
78 {
79 char *params_copy = xstrdup(params_string);
80 struct string_list params = STRING_LIST_INIT_NODUP;
81 int ret = 0;
82 int i;
83
84 if (*params_copy)
85 string_list_split_in_place(&params, params_copy, ',', -1);
86 for (i = 0; i < params.nr; i++) {
87 const char *p = params.items[i].string;
88 if (!strcmp(p, "changes")) {
89 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
90 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
91 } else if (!strcmp(p, "lines")) {
92 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
93 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
94 } else if (!strcmp(p, "files")) {
95 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
96 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
97 } else if (!strcmp(p, "noncumulative")) {
98 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
99 } else if (!strcmp(p, "cumulative")) {
100 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
101 } else if (isdigit(*p)) {
102 char *end;
103 int permille = strtoul(p, &end, 10) * 10;
104 if (*end == '.' && isdigit(*++end)) {
105 /* only use first digit */
106 permille += *end - '0';
107 /* .. and ignore any further digits */
108 while (isdigit(*++end))
109 ; /* nothing */
110 }
111 if (!*end)
112 options->dirstat_permille = permille;
113 else {
114 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
115 p);
116 ret++;
117 }
118 } else {
119 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
120 ret++;
121 }
122
123 }
124 string_list_clear(&params, 0);
125 free(params_copy);
126 return ret;
127 }
128
129 static int parse_submodule_params(struct diff_options *options, const char *value)
130 {
131 if (!strcmp(value, "log"))
132 DIFF_OPT_SET(options, SUBMODULE_LOG);
133 else if (!strcmp(value, "short"))
134 DIFF_OPT_CLR(options, SUBMODULE_LOG);
135 else
136 return -1;
137 return 0;
138 }
139
140 static int git_config_rename(const char *var, const char *value)
141 {
142 if (!value)
143 return DIFF_DETECT_RENAME;
144 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
145 return DIFF_DETECT_COPY;
146 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
147 }
148
149 long parse_algorithm_value(const char *value)
150 {
151 if (!value)
152 return -1;
153 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
154 return 0;
155 else if (!strcasecmp(value, "minimal"))
156 return XDF_NEED_MINIMAL;
157 else if (!strcasecmp(value, "patience"))
158 return XDF_PATIENCE_DIFF;
159 else if (!strcasecmp(value, "histogram"))
160 return XDF_HISTOGRAM_DIFF;
161 return -1;
162 }
163
164 /*
165 * These are to give UI layer defaults.
166 * The core-level commands such as git-diff-files should
167 * never be affected by the setting of diff.renames
168 * the user happens to have in the configuration file.
169 */
170 int git_diff_ui_config(const char *var, const char *value, void *cb)
171 {
172 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
173 diff_use_color_default = git_config_colorbool(var, value);
174 return 0;
175 }
176 if (!strcmp(var, "diff.context")) {
177 diff_context_default = git_config_int(var, value);
178 if (diff_context_default < 0)
179 return -1;
180 return 0;
181 }
182 if (!strcmp(var, "diff.renames")) {
183 diff_detect_rename_default = git_config_rename(var, value);
184 return 0;
185 }
186 if (!strcmp(var, "diff.autorefreshindex")) {
187 diff_auto_refresh_index = git_config_bool(var, value);
188 return 0;
189 }
190 if (!strcmp(var, "diff.mnemonicprefix")) {
191 diff_mnemonic_prefix = git_config_bool(var, value);
192 return 0;
193 }
194 if (!strcmp(var, "diff.noprefix")) {
195 diff_no_prefix = git_config_bool(var, value);
196 return 0;
197 }
198 if (!strcmp(var, "diff.statgraphwidth")) {
199 diff_stat_graph_width = git_config_int(var, value);
200 return 0;
201 }
202 if (!strcmp(var, "diff.external"))
203 return git_config_string(&external_diff_cmd_cfg, var, value);
204 if (!strcmp(var, "diff.wordregex"))
205 return git_config_string(&diff_word_regex_cfg, var, value);
206 if (!strcmp(var, "diff.orderfile"))
207 return git_config_pathname(&diff_order_file_cfg, var, value);
208
209 if (!strcmp(var, "diff.ignoresubmodules"))
210 handle_ignore_submodules_arg(&default_diff_options, value);
211
212 if (!strcmp(var, "diff.submodule")) {
213 if (parse_submodule_params(&default_diff_options, value))
214 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
215 value);
216 return 0;
217 }
218
219 if (!strcmp(var, "diff.algorithm")) {
220 diff_algorithm = parse_algorithm_value(value);
221 if (diff_algorithm < 0)
222 return -1;
223 return 0;
224 }
225
226 if (git_color_config(var, value, cb) < 0)
227 return -1;
228
229 return git_diff_basic_config(var, value, cb);
230 }
231
232 int git_diff_basic_config(const char *var, const char *value, void *cb)
233 {
234 if (!strcmp(var, "diff.renamelimit")) {
235 diff_rename_limit_default = git_config_int(var, value);
236 return 0;
237 }
238
239 if (userdiff_config(var, value) < 0)
240 return -1;
241
242 if (starts_with(var, "diff.color.") || starts_with(var, "color.diff.")) {
243 int slot = parse_diff_color_slot(var, 11);
244 if (slot < 0)
245 return 0;
246 if (!value)
247 return config_error_nonbool(var);
248 color_parse(value, var, diff_colors[slot]);
249 return 0;
250 }
251
252 /* like GNU diff's --suppress-blank-empty option */
253 if (!strcmp(var, "diff.suppressblankempty") ||
254 /* for backwards compatibility */
255 !strcmp(var, "diff.suppress-blank-empty")) {
256 diff_suppress_blank_empty = git_config_bool(var, value);
257 return 0;
258 }
259
260 if (!strcmp(var, "diff.dirstat")) {
261 struct strbuf errmsg = STRBUF_INIT;
262 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
263 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
264 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
265 errmsg.buf);
266 strbuf_release(&errmsg);
267 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
268 return 0;
269 }
270
271 if (starts_with(var, "submodule."))
272 return parse_submodule_config_option(var, value);
273
274 return git_default_config(var, value, cb);
275 }
276
277 static char *quote_two(const char *one, const char *two)
278 {
279 int need_one = quote_c_style(one, NULL, NULL, 1);
280 int need_two = quote_c_style(two, NULL, NULL, 1);
281 struct strbuf res = STRBUF_INIT;
282
283 if (need_one + need_two) {
284 strbuf_addch(&res, '"');
285 quote_c_style(one, &res, NULL, 1);
286 quote_c_style(two, &res, NULL, 1);
287 strbuf_addch(&res, '"');
288 } else {
289 strbuf_addstr(&res, one);
290 strbuf_addstr(&res, two);
291 }
292 return strbuf_detach(&res, NULL);
293 }
294
295 static const char *external_diff(void)
296 {
297 static const char *external_diff_cmd = NULL;
298 static int done_preparing = 0;
299
300 if (done_preparing)
301 return external_diff_cmd;
302 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
303 if (!external_diff_cmd)
304 external_diff_cmd = external_diff_cmd_cfg;
305 done_preparing = 1;
306 return external_diff_cmd;
307 }
308
309 static struct diff_tempfile {
310 const char *name; /* filename external diff should read from */
311 char hex[41];
312 char mode[10];
313 char tmp_path[PATH_MAX];
314 } diff_temp[2];
315
316 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
317
318 struct emit_callback {
319 int color_diff;
320 unsigned ws_rule;
321 int blank_at_eof_in_preimage;
322 int blank_at_eof_in_postimage;
323 int lno_in_preimage;
324 int lno_in_postimage;
325 sane_truncate_fn truncate;
326 const char **label_path;
327 struct diff_words_data *diff_words;
328 struct diff_options *opt;
329 int *found_changesp;
330 struct strbuf *header;
331 };
332
333 static int count_lines(const char *data, int size)
334 {
335 int count, ch, completely_empty = 1, nl_just_seen = 0;
336 count = 0;
337 while (0 < size--) {
338 ch = *data++;
339 if (ch == '\n') {
340 count++;
341 nl_just_seen = 1;
342 completely_empty = 0;
343 }
344 else {
345 nl_just_seen = 0;
346 completely_empty = 0;
347 }
348 }
349 if (completely_empty)
350 return 0;
351 if (!nl_just_seen)
352 count++; /* no trailing newline */
353 return count;
354 }
355
356 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
357 {
358 if (!DIFF_FILE_VALID(one)) {
359 mf->ptr = (char *)""; /* does not matter */
360 mf->size = 0;
361 return 0;
362 }
363 else if (diff_populate_filespec(one, 0))
364 return -1;
365
366 mf->ptr = one->data;
367 mf->size = one->size;
368 return 0;
369 }
370
371 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
372 static unsigned long diff_filespec_size(struct diff_filespec *one)
373 {
374 if (!DIFF_FILE_VALID(one))
375 return 0;
376 diff_populate_filespec(one, 1);
377 return one->size;
378 }
379
380 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
381 {
382 char *ptr = mf->ptr;
383 long size = mf->size;
384 int cnt = 0;
385
386 if (!size)
387 return cnt;
388 ptr += size - 1; /* pointing at the very end */
389 if (*ptr != '\n')
390 ; /* incomplete line */
391 else
392 ptr--; /* skip the last LF */
393 while (mf->ptr < ptr) {
394 char *prev_eol;
395 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
396 if (*prev_eol == '\n')
397 break;
398 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
399 break;
400 cnt++;
401 ptr = prev_eol - 1;
402 }
403 return cnt;
404 }
405
406 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
407 struct emit_callback *ecbdata)
408 {
409 int l1, l2, at;
410 unsigned ws_rule = ecbdata->ws_rule;
411 l1 = count_trailing_blank(mf1, ws_rule);
412 l2 = count_trailing_blank(mf2, ws_rule);
413 if (l2 <= l1) {
414 ecbdata->blank_at_eof_in_preimage = 0;
415 ecbdata->blank_at_eof_in_postimage = 0;
416 return;
417 }
418 at = count_lines(mf1->ptr, mf1->size);
419 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
420
421 at = count_lines(mf2->ptr, mf2->size);
422 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
423 }
424
425 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
426 int first, const char *line, int len)
427 {
428 int has_trailing_newline, has_trailing_carriage_return;
429 int nofirst;
430 FILE *file = o->file;
431
432 fputs(diff_line_prefix(o), file);
433
434 if (len == 0) {
435 has_trailing_newline = (first == '\n');
436 has_trailing_carriage_return = (!has_trailing_newline &&
437 (first == '\r'));
438 nofirst = has_trailing_newline || has_trailing_carriage_return;
439 } else {
440 has_trailing_newline = (len > 0 && line[len-1] == '\n');
441 if (has_trailing_newline)
442 len--;
443 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
444 if (has_trailing_carriage_return)
445 len--;
446 nofirst = 0;
447 }
448
449 if (len || !nofirst) {
450 fputs(set, file);
451 if (!nofirst)
452 fputc(first, file);
453 fwrite(line, len, 1, file);
454 fputs(reset, file);
455 }
456 if (has_trailing_carriage_return)
457 fputc('\r', file);
458 if (has_trailing_newline)
459 fputc('\n', file);
460 }
461
462 static void emit_line(struct diff_options *o, const char *set, const char *reset,
463 const char *line, int len)
464 {
465 emit_line_0(o, set, reset, line[0], line+1, len-1);
466 }
467
468 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
469 {
470 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
471 ecbdata->blank_at_eof_in_preimage &&
472 ecbdata->blank_at_eof_in_postimage &&
473 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
474 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
475 return 0;
476 return ws_blank_line(line, len, ecbdata->ws_rule);
477 }
478
479 static void emit_add_line(const char *reset,
480 struct emit_callback *ecbdata,
481 const char *line, int len)
482 {
483 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
484 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
485
486 if (!*ws)
487 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
488 else if (new_blank_line_at_eof(ecbdata, line, len))
489 /* Blank line at EOF - paint '+' as well */
490 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
491 else {
492 /* Emit just the prefix, then the rest. */
493 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
494 ws_check_emit(line, len, ecbdata->ws_rule,
495 ecbdata->opt->file, set, reset, ws);
496 }
497 }
498
499 static void emit_hunk_header(struct emit_callback *ecbdata,
500 const char *line, int len)
501 {
502 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
503 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
504 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
505 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
506 static const char atat[2] = { '@', '@' };
507 const char *cp, *ep;
508 struct strbuf msgbuf = STRBUF_INIT;
509 int org_len = len;
510 int i = 1;
511
512 /*
513 * As a hunk header must begin with "@@ -<old>, +<new> @@",
514 * it always is at least 10 bytes long.
515 */
516 if (len < 10 ||
517 memcmp(line, atat, 2) ||
518 !(ep = memmem(line + 2, len - 2, atat, 2))) {
519 emit_line(ecbdata->opt, plain, reset, line, len);
520 return;
521 }
522 ep += 2; /* skip over @@ */
523
524 /* The hunk header in fraginfo color */
525 strbuf_add(&msgbuf, frag, strlen(frag));
526 strbuf_add(&msgbuf, line, ep - line);
527 strbuf_add(&msgbuf, reset, strlen(reset));
528
529 /*
530 * trailing "\r\n"
531 */
532 for ( ; i < 3; i++)
533 if (line[len - i] == '\r' || line[len - i] == '\n')
534 len--;
535
536 /* blank before the func header */
537 for (cp = ep; ep - line < len; ep++)
538 if (*ep != ' ' && *ep != '\t')
539 break;
540 if (ep != cp) {
541 strbuf_add(&msgbuf, plain, strlen(plain));
542 strbuf_add(&msgbuf, cp, ep - cp);
543 strbuf_add(&msgbuf, reset, strlen(reset));
544 }
545
546 if (ep < line + len) {
547 strbuf_add(&msgbuf, func, strlen(func));
548 strbuf_add(&msgbuf, ep, line + len - ep);
549 strbuf_add(&msgbuf, reset, strlen(reset));
550 }
551
552 strbuf_add(&msgbuf, line + len, org_len - len);
553 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
554 strbuf_release(&msgbuf);
555 }
556
557 static struct diff_tempfile *claim_diff_tempfile(void) {
558 int i;
559 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
560 if (!diff_temp[i].name)
561 return diff_temp + i;
562 die("BUG: diff is failing to clean up its tempfiles");
563 }
564
565 static int remove_tempfile_installed;
566
567 static void remove_tempfile(void)
568 {
569 int i;
570 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
571 if (diff_temp[i].name == diff_temp[i].tmp_path)
572 unlink_or_warn(diff_temp[i].name);
573 diff_temp[i].name = NULL;
574 }
575 }
576
577 static void remove_tempfile_on_signal(int signo)
578 {
579 remove_tempfile();
580 sigchain_pop(signo);
581 raise(signo);
582 }
583
584 static void print_line_count(FILE *file, int count)
585 {
586 switch (count) {
587 case 0:
588 fprintf(file, "0,0");
589 break;
590 case 1:
591 fprintf(file, "1");
592 break;
593 default:
594 fprintf(file, "1,%d", count);
595 break;
596 }
597 }
598
599 static void emit_rewrite_lines(struct emit_callback *ecb,
600 int prefix, const char *data, int size)
601 {
602 const char *endp = NULL;
603 static const char *nneof = " No newline at end of file\n";
604 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
605 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
606
607 while (0 < size) {
608 int len;
609
610 endp = memchr(data, '\n', size);
611 len = endp ? (endp - data + 1) : size;
612 if (prefix != '+') {
613 ecb->lno_in_preimage++;
614 emit_line_0(ecb->opt, old, reset, '-',
615 data, len);
616 } else {
617 ecb->lno_in_postimage++;
618 emit_add_line(reset, ecb, data, len);
619 }
620 size -= len;
621 data += len;
622 }
623 if (!endp) {
624 const char *plain = diff_get_color(ecb->color_diff,
625 DIFF_PLAIN);
626 putc('\n', ecb->opt->file);
627 emit_line_0(ecb->opt, plain, reset, '\\',
628 nneof, strlen(nneof));
629 }
630 }
631
632 static void emit_rewrite_diff(const char *name_a,
633 const char *name_b,
634 struct diff_filespec *one,
635 struct diff_filespec *two,
636 struct userdiff_driver *textconv_one,
637 struct userdiff_driver *textconv_two,
638 struct diff_options *o)
639 {
640 int lc_a, lc_b;
641 const char *name_a_tab, *name_b_tab;
642 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
643 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
644 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
645 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
646 const char *a_prefix, *b_prefix;
647 char *data_one, *data_two;
648 size_t size_one, size_two;
649 struct emit_callback ecbdata;
650 const char *line_prefix = diff_line_prefix(o);
651
652 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
653 a_prefix = o->b_prefix;
654 b_prefix = o->a_prefix;
655 } else {
656 a_prefix = o->a_prefix;
657 b_prefix = o->b_prefix;
658 }
659
660 name_a += (*name_a == '/');
661 name_b += (*name_b == '/');
662 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
663 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
664
665 strbuf_reset(&a_name);
666 strbuf_reset(&b_name);
667 quote_two_c_style(&a_name, a_prefix, name_a, 0);
668 quote_two_c_style(&b_name, b_prefix, name_b, 0);
669
670 size_one = fill_textconv(textconv_one, one, &data_one);
671 size_two = fill_textconv(textconv_two, two, &data_two);
672
673 memset(&ecbdata, 0, sizeof(ecbdata));
674 ecbdata.color_diff = want_color(o->use_color);
675 ecbdata.found_changesp = &o->found_changes;
676 ecbdata.ws_rule = whitespace_rule(name_b);
677 ecbdata.opt = o;
678 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
679 mmfile_t mf1, mf2;
680 mf1.ptr = (char *)data_one;
681 mf2.ptr = (char *)data_two;
682 mf1.size = size_one;
683 mf2.size = size_two;
684 check_blank_at_eof(&mf1, &mf2, &ecbdata);
685 }
686 ecbdata.lno_in_preimage = 1;
687 ecbdata.lno_in_postimage = 1;
688
689 lc_a = count_lines(data_one, size_one);
690 lc_b = count_lines(data_two, size_two);
691 fprintf(o->file,
692 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
693 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
694 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
695 line_prefix, fraginfo);
696 if (!o->irreversible_delete)
697 print_line_count(o->file, lc_a);
698 else
699 fprintf(o->file, "?,?");
700 fprintf(o->file, " +");
701 print_line_count(o->file, lc_b);
702 fprintf(o->file, " @@%s\n", reset);
703 if (lc_a && !o->irreversible_delete)
704 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
705 if (lc_b)
706 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
707 if (textconv_one)
708 free((char *)data_one);
709 if (textconv_two)
710 free((char *)data_two);
711 }
712
713 struct diff_words_buffer {
714 mmfile_t text;
715 long alloc;
716 struct diff_words_orig {
717 const char *begin, *end;
718 } *orig;
719 int orig_nr, orig_alloc;
720 };
721
722 static void diff_words_append(char *line, unsigned long len,
723 struct diff_words_buffer *buffer)
724 {
725 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
726 line++;
727 len--;
728 memcpy(buffer->text.ptr + buffer->text.size, line, len);
729 buffer->text.size += len;
730 buffer->text.ptr[buffer->text.size] = '\0';
731 }
732
733 struct diff_words_style_elem {
734 const char *prefix;
735 const char *suffix;
736 const char *color; /* NULL; filled in by the setup code if
737 * color is enabled */
738 };
739
740 struct diff_words_style {
741 enum diff_words_type type;
742 struct diff_words_style_elem new, old, ctx;
743 const char *newline;
744 };
745
746 static struct diff_words_style diff_words_styles[] = {
747 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
748 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
749 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
750 };
751
752 struct diff_words_data {
753 struct diff_words_buffer minus, plus;
754 const char *current_plus;
755 int last_minus;
756 struct diff_options *opt;
757 regex_t *word_regex;
758 enum diff_words_type type;
759 struct diff_words_style *style;
760 };
761
762 static int fn_out_diff_words_write_helper(FILE *fp,
763 struct diff_words_style_elem *st_el,
764 const char *newline,
765 size_t count, const char *buf,
766 const char *line_prefix)
767 {
768 int print = 0;
769
770 while (count) {
771 char *p = memchr(buf, '\n', count);
772 if (print)
773 fputs(line_prefix, fp);
774 if (p != buf) {
775 if (st_el->color && fputs(st_el->color, fp) < 0)
776 return -1;
777 if (fputs(st_el->prefix, fp) < 0 ||
778 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
779 fputs(st_el->suffix, fp) < 0)
780 return -1;
781 if (st_el->color && *st_el->color
782 && fputs(GIT_COLOR_RESET, fp) < 0)
783 return -1;
784 }
785 if (!p)
786 return 0;
787 if (fputs(newline, fp) < 0)
788 return -1;
789 count -= p + 1 - buf;
790 buf = p + 1;
791 print = 1;
792 }
793 return 0;
794 }
795
796 /*
797 * '--color-words' algorithm can be described as:
798 *
799 * 1. collect a the minus/plus lines of a diff hunk, divided into
800 * minus-lines and plus-lines;
801 *
802 * 2. break both minus-lines and plus-lines into words and
803 * place them into two mmfile_t with one word for each line;
804 *
805 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
806 *
807 * And for the common parts of the both file, we output the plus side text.
808 * diff_words->current_plus is used to trace the current position of the plus file
809 * which printed. diff_words->last_minus is used to trace the last minus word
810 * printed.
811 *
812 * For '--graph' to work with '--color-words', we need to output the graph prefix
813 * on each line of color words output. Generally, there are two conditions on
814 * which we should output the prefix.
815 *
816 * 1. diff_words->last_minus == 0 &&
817 * diff_words->current_plus == diff_words->plus.text.ptr
818 *
819 * that is: the plus text must start as a new line, and if there is no minus
820 * word printed, a graph prefix must be printed.
821 *
822 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
823 * *(diff_words->current_plus - 1) == '\n'
824 *
825 * that is: a graph prefix must be printed following a '\n'
826 */
827 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
828 {
829 if ((diff_words->last_minus == 0 &&
830 diff_words->current_plus == diff_words->plus.text.ptr) ||
831 (diff_words->current_plus > diff_words->plus.text.ptr &&
832 *(diff_words->current_plus - 1) == '\n')) {
833 return 1;
834 } else {
835 return 0;
836 }
837 }
838
839 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
840 {
841 struct diff_words_data *diff_words = priv;
842 struct diff_words_style *style = diff_words->style;
843 int minus_first, minus_len, plus_first, plus_len;
844 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
845 struct diff_options *opt = diff_words->opt;
846 const char *line_prefix;
847
848 if (line[0] != '@' || parse_hunk_header(line, len,
849 &minus_first, &minus_len, &plus_first, &plus_len))
850 return;
851
852 assert(opt);
853 line_prefix = diff_line_prefix(opt);
854
855 /* POSIX requires that first be decremented by one if len == 0... */
856 if (minus_len) {
857 minus_begin = diff_words->minus.orig[minus_first].begin;
858 minus_end =
859 diff_words->minus.orig[minus_first + minus_len - 1].end;
860 } else
861 minus_begin = minus_end =
862 diff_words->minus.orig[minus_first].end;
863
864 if (plus_len) {
865 plus_begin = diff_words->plus.orig[plus_first].begin;
866 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
867 } else
868 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
869
870 if (color_words_output_graph_prefix(diff_words)) {
871 fputs(line_prefix, diff_words->opt->file);
872 }
873 if (diff_words->current_plus != plus_begin) {
874 fn_out_diff_words_write_helper(diff_words->opt->file,
875 &style->ctx, style->newline,
876 plus_begin - diff_words->current_plus,
877 diff_words->current_plus, line_prefix);
878 if (*(plus_begin - 1) == '\n')
879 fputs(line_prefix, diff_words->opt->file);
880 }
881 if (minus_begin != minus_end) {
882 fn_out_diff_words_write_helper(diff_words->opt->file,
883 &style->old, style->newline,
884 minus_end - minus_begin, minus_begin,
885 line_prefix);
886 }
887 if (plus_begin != plus_end) {
888 fn_out_diff_words_write_helper(diff_words->opt->file,
889 &style->new, style->newline,
890 plus_end - plus_begin, plus_begin,
891 line_prefix);
892 }
893
894 diff_words->current_plus = plus_end;
895 diff_words->last_minus = minus_first;
896 }
897
898 /* This function starts looking at *begin, and returns 0 iff a word was found. */
899 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
900 int *begin, int *end)
901 {
902 if (word_regex && *begin < buffer->size) {
903 regmatch_t match[1];
904 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
905 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
906 '\n', match[0].rm_eo - match[0].rm_so);
907 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
908 *begin += match[0].rm_so;
909 return *begin >= *end;
910 }
911 return -1;
912 }
913
914 /* find the next word */
915 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
916 (*begin)++;
917 if (*begin >= buffer->size)
918 return -1;
919
920 /* find the end of the word */
921 *end = *begin + 1;
922 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
923 (*end)++;
924
925 return 0;
926 }
927
928 /*
929 * This function splits the words in buffer->text, stores the list with
930 * newline separator into out, and saves the offsets of the original words
931 * in buffer->orig.
932 */
933 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
934 regex_t *word_regex)
935 {
936 int i, j;
937 long alloc = 0;
938
939 out->size = 0;
940 out->ptr = NULL;
941
942 /* fake an empty "0th" word */
943 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
944 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
945 buffer->orig_nr = 1;
946
947 for (i = 0; i < buffer->text.size; i++) {
948 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
949 return;
950
951 /* store original boundaries */
952 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
953 buffer->orig_alloc);
954 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
955 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
956 buffer->orig_nr++;
957
958 /* store one word */
959 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
960 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
961 out->ptr[out->size + j - i] = '\n';
962 out->size += j - i + 1;
963
964 i = j - 1;
965 }
966 }
967
968 /* this executes the word diff on the accumulated buffers */
969 static void diff_words_show(struct diff_words_data *diff_words)
970 {
971 xpparam_t xpp;
972 xdemitconf_t xecfg;
973 mmfile_t minus, plus;
974 struct diff_words_style *style = diff_words->style;
975
976 struct diff_options *opt = diff_words->opt;
977 const char *line_prefix;
978
979 assert(opt);
980 line_prefix = diff_line_prefix(opt);
981
982 /* special case: only removal */
983 if (!diff_words->plus.text.size) {
984 fputs(line_prefix, diff_words->opt->file);
985 fn_out_diff_words_write_helper(diff_words->opt->file,
986 &style->old, style->newline,
987 diff_words->minus.text.size,
988 diff_words->minus.text.ptr, line_prefix);
989 diff_words->minus.text.size = 0;
990 return;
991 }
992
993 diff_words->current_plus = diff_words->plus.text.ptr;
994 diff_words->last_minus = 0;
995
996 memset(&xpp, 0, sizeof(xpp));
997 memset(&xecfg, 0, sizeof(xecfg));
998 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
999 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1000 xpp.flags = 0;
1001 /* as only the hunk header will be parsed, we need a 0-context */
1002 xecfg.ctxlen = 0;
1003 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1004 &xpp, &xecfg);
1005 free(minus.ptr);
1006 free(plus.ptr);
1007 if (diff_words->current_plus != diff_words->plus.text.ptr +
1008 diff_words->plus.text.size) {
1009 if (color_words_output_graph_prefix(diff_words))
1010 fputs(line_prefix, diff_words->opt->file);
1011 fn_out_diff_words_write_helper(diff_words->opt->file,
1012 &style->ctx, style->newline,
1013 diff_words->plus.text.ptr + diff_words->plus.text.size
1014 - diff_words->current_plus, diff_words->current_plus,
1015 line_prefix);
1016 }
1017 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1018 }
1019
1020 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1021 static void diff_words_flush(struct emit_callback *ecbdata)
1022 {
1023 if (ecbdata->diff_words->minus.text.size ||
1024 ecbdata->diff_words->plus.text.size)
1025 diff_words_show(ecbdata->diff_words);
1026 }
1027
1028 static void diff_filespec_load_driver(struct diff_filespec *one)
1029 {
1030 /* Use already-loaded driver */
1031 if (one->driver)
1032 return;
1033
1034 if (S_ISREG(one->mode))
1035 one->driver = userdiff_find_by_path(one->path);
1036
1037 /* Fallback to default settings */
1038 if (!one->driver)
1039 one->driver = userdiff_find_by_name("default");
1040 }
1041
1042 static const char *userdiff_word_regex(struct diff_filespec *one)
1043 {
1044 diff_filespec_load_driver(one);
1045 return one->driver->word_regex;
1046 }
1047
1048 static void init_diff_words_data(struct emit_callback *ecbdata,
1049 struct diff_options *orig_opts,
1050 struct diff_filespec *one,
1051 struct diff_filespec *two)
1052 {
1053 int i;
1054 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1055 memcpy(o, orig_opts, sizeof(struct diff_options));
1056
1057 ecbdata->diff_words =
1058 xcalloc(1, sizeof(struct diff_words_data));
1059 ecbdata->diff_words->type = o->word_diff;
1060 ecbdata->diff_words->opt = o;
1061 if (!o->word_regex)
1062 o->word_regex = userdiff_word_regex(one);
1063 if (!o->word_regex)
1064 o->word_regex = userdiff_word_regex(two);
1065 if (!o->word_regex)
1066 o->word_regex = diff_word_regex_cfg;
1067 if (o->word_regex) {
1068 ecbdata->diff_words->word_regex = (regex_t *)
1069 xmalloc(sizeof(regex_t));
1070 if (regcomp(ecbdata->diff_words->word_regex,
1071 o->word_regex,
1072 REG_EXTENDED | REG_NEWLINE))
1073 die ("Invalid regular expression: %s",
1074 o->word_regex);
1075 }
1076 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1077 if (o->word_diff == diff_words_styles[i].type) {
1078 ecbdata->diff_words->style =
1079 &diff_words_styles[i];
1080 break;
1081 }
1082 }
1083 if (want_color(o->use_color)) {
1084 struct diff_words_style *st = ecbdata->diff_words->style;
1085 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1086 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1087 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1088 }
1089 }
1090
1091 static void free_diff_words_data(struct emit_callback *ecbdata)
1092 {
1093 if (ecbdata->diff_words) {
1094 diff_words_flush(ecbdata);
1095 free (ecbdata->diff_words->opt);
1096 free (ecbdata->diff_words->minus.text.ptr);
1097 free (ecbdata->diff_words->minus.orig);
1098 free (ecbdata->diff_words->plus.text.ptr);
1099 free (ecbdata->diff_words->plus.orig);
1100 if (ecbdata->diff_words->word_regex) {
1101 regfree(ecbdata->diff_words->word_regex);
1102 free(ecbdata->diff_words->word_regex);
1103 }
1104 free(ecbdata->diff_words);
1105 ecbdata->diff_words = NULL;
1106 }
1107 }
1108
1109 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1110 {
1111 if (want_color(diff_use_color))
1112 return diff_colors[ix];
1113 return "";
1114 }
1115
1116 const char *diff_line_prefix(struct diff_options *opt)
1117 {
1118 struct strbuf *msgbuf;
1119 if (!opt->output_prefix)
1120 return "";
1121
1122 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1123 return msgbuf->buf;
1124 }
1125
1126 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1127 {
1128 const char *cp;
1129 unsigned long allot;
1130 size_t l = len;
1131
1132 if (ecb->truncate)
1133 return ecb->truncate(line, len);
1134 cp = line;
1135 allot = l;
1136 while (0 < l) {
1137 (void) utf8_width(&cp, &l);
1138 if (!cp)
1139 break; /* truncated in the middle? */
1140 }
1141 return allot - l;
1142 }
1143
1144 static void find_lno(const char *line, struct emit_callback *ecbdata)
1145 {
1146 const char *p;
1147 ecbdata->lno_in_preimage = 0;
1148 ecbdata->lno_in_postimage = 0;
1149 p = strchr(line, '-');
1150 if (!p)
1151 return; /* cannot happen */
1152 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1153 p = strchr(p, '+');
1154 if (!p)
1155 return; /* cannot happen */
1156 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1157 }
1158
1159 static void fn_out_consume(void *priv, char *line, unsigned long len)
1160 {
1161 struct emit_callback *ecbdata = priv;
1162 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1163 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1164 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1165 struct diff_options *o = ecbdata->opt;
1166 const char *line_prefix = diff_line_prefix(o);
1167
1168 if (ecbdata->header) {
1169 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1170 strbuf_reset(ecbdata->header);
1171 ecbdata->header = NULL;
1172 }
1173 *(ecbdata->found_changesp) = 1;
1174
1175 if (ecbdata->label_path[0]) {
1176 const char *name_a_tab, *name_b_tab;
1177
1178 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1179 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1180
1181 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1182 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1183 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1184 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1185 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1186 }
1187
1188 if (diff_suppress_blank_empty
1189 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1190 line[0] = '\n';
1191 len = 1;
1192 }
1193
1194 if (line[0] == '@') {
1195 if (ecbdata->diff_words)
1196 diff_words_flush(ecbdata);
1197 len = sane_truncate_line(ecbdata, line, len);
1198 find_lno(line, ecbdata);
1199 emit_hunk_header(ecbdata, line, len);
1200 if (line[len-1] != '\n')
1201 putc('\n', ecbdata->opt->file);
1202 return;
1203 }
1204
1205 if (len < 1) {
1206 emit_line(ecbdata->opt, reset, reset, line, len);
1207 if (ecbdata->diff_words
1208 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1209 fputs("~\n", ecbdata->opt->file);
1210 return;
1211 }
1212
1213 if (ecbdata->diff_words) {
1214 if (line[0] == '-') {
1215 diff_words_append(line, len,
1216 &ecbdata->diff_words->minus);
1217 return;
1218 } else if (line[0] == '+') {
1219 diff_words_append(line, len,
1220 &ecbdata->diff_words->plus);
1221 return;
1222 } else if (starts_with(line, "\\ ")) {
1223 /*
1224 * Eat the "no newline at eof" marker as if we
1225 * saw a "+" or "-" line with nothing on it,
1226 * and return without diff_words_flush() to
1227 * defer processing. If this is the end of
1228 * preimage, more "+" lines may come after it.
1229 */
1230 return;
1231 }
1232 diff_words_flush(ecbdata);
1233 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1234 emit_line(ecbdata->opt, plain, reset, line, len);
1235 fputs("~\n", ecbdata->opt->file);
1236 } else {
1237 /*
1238 * Skip the prefix character, if any. With
1239 * diff_suppress_blank_empty, there may be
1240 * none.
1241 */
1242 if (line[0] != '\n') {
1243 line++;
1244 len--;
1245 }
1246 emit_line(ecbdata->opt, plain, reset, line, len);
1247 }
1248 return;
1249 }
1250
1251 if (line[0] != '+') {
1252 const char *color =
1253 diff_get_color(ecbdata->color_diff,
1254 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1255 ecbdata->lno_in_preimage++;
1256 if (line[0] == ' ')
1257 ecbdata->lno_in_postimage++;
1258 emit_line(ecbdata->opt, color, reset, line, len);
1259 } else {
1260 ecbdata->lno_in_postimage++;
1261 emit_add_line(reset, ecbdata, line + 1, len - 1);
1262 }
1263 }
1264
1265 static char *pprint_rename(const char *a, const char *b)
1266 {
1267 const char *old = a;
1268 const char *new = b;
1269 struct strbuf name = STRBUF_INIT;
1270 int pfx_length, sfx_length;
1271 int pfx_adjust_for_slash;
1272 int len_a = strlen(a);
1273 int len_b = strlen(b);
1274 int a_midlen, b_midlen;
1275 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1276 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1277
1278 if (qlen_a || qlen_b) {
1279 quote_c_style(a, &name, NULL, 0);
1280 strbuf_addstr(&name, " => ");
1281 quote_c_style(b, &name, NULL, 0);
1282 return strbuf_detach(&name, NULL);
1283 }
1284
1285 /* Find common prefix */
1286 pfx_length = 0;
1287 while (*old && *new && *old == *new) {
1288 if (*old == '/')
1289 pfx_length = old - a + 1;
1290 old++;
1291 new++;
1292 }
1293
1294 /* Find common suffix */
1295 old = a + len_a;
1296 new = b + len_b;
1297 sfx_length = 0;
1298 /*
1299 * If there is a common prefix, it must end in a slash. In
1300 * that case we let this loop run 1 into the prefix to see the
1301 * same slash.
1302 *
1303 * If there is no common prefix, we cannot do this as it would
1304 * underrun the input strings.
1305 */
1306 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1307 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1308 b + pfx_length - pfx_adjust_for_slash <= new &&
1309 *old == *new) {
1310 if (*old == '/')
1311 sfx_length = len_a - (old - a);
1312 old--;
1313 new--;
1314 }
1315
1316 /*
1317 * pfx{mid-a => mid-b}sfx
1318 * {pfx-a => pfx-b}sfx
1319 * pfx{sfx-a => sfx-b}
1320 * name-a => name-b
1321 */
1322 a_midlen = len_a - pfx_length - sfx_length;
1323 b_midlen = len_b - pfx_length - sfx_length;
1324 if (a_midlen < 0)
1325 a_midlen = 0;
1326 if (b_midlen < 0)
1327 b_midlen = 0;
1328
1329 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1330 if (pfx_length + sfx_length) {
1331 strbuf_add(&name, a, pfx_length);
1332 strbuf_addch(&name, '{');
1333 }
1334 strbuf_add(&name, a + pfx_length, a_midlen);
1335 strbuf_addstr(&name, " => ");
1336 strbuf_add(&name, b + pfx_length, b_midlen);
1337 if (pfx_length + sfx_length) {
1338 strbuf_addch(&name, '}');
1339 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1340 }
1341 return strbuf_detach(&name, NULL);
1342 }
1343
1344 struct diffstat_t {
1345 int nr;
1346 int alloc;
1347 struct diffstat_file {
1348 char *from_name;
1349 char *name;
1350 char *print_name;
1351 unsigned is_unmerged:1;
1352 unsigned is_binary:1;
1353 unsigned is_renamed:1;
1354 unsigned is_interesting:1;
1355 uintmax_t added, deleted;
1356 } **files;
1357 };
1358
1359 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1360 const char *name_a,
1361 const char *name_b)
1362 {
1363 struct diffstat_file *x;
1364 x = xcalloc(sizeof (*x), 1);
1365 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
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 strbuf_addf(&sb,
1466 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1467 insertions);
1468 }
1469
1470 if (deletions || insertions == 0) {
1471 strbuf_addf(&sb,
1472 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1473 deletions);
1474 }
1475 strbuf_addch(&sb, '\n');
1476 ret = fputs(sb.buf, fp);
1477 strbuf_release(&sb);
1478 return ret;
1479 }
1480
1481 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1482 {
1483 int i, len, add, del, adds = 0, dels = 0;
1484 uintmax_t max_change = 0, max_len = 0;
1485 int total_files = data->nr, count;
1486 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1487 const char *reset, *add_c, *del_c;
1488 const char *line_prefix = "";
1489 int extra_shown = 0;
1490
1491 if (data->nr == 0)
1492 return;
1493
1494 line_prefix = diff_line_prefix(options);
1495 count = options->stat_count ? options->stat_count : data->nr;
1496
1497 reset = diff_get_color_opt(options, DIFF_RESET);
1498 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1499 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1500
1501 /*
1502 * Find the longest filename and max number of changes
1503 */
1504 for (i = 0; (i < count) && (i < data->nr); i++) {
1505 struct diffstat_file *file = data->files[i];
1506 uintmax_t change = file->added + file->deleted;
1507
1508 if (!file->is_interesting && (change == 0)) {
1509 count++; /* not shown == room for one more */
1510 continue;
1511 }
1512 fill_print_name(file);
1513 len = strlen(file->print_name);
1514 if (max_len < len)
1515 max_len = len;
1516
1517 if (file->is_unmerged) {
1518 /* "Unmerged" is 8 characters */
1519 bin_width = bin_width < 8 ? 8 : bin_width;
1520 continue;
1521 }
1522 if (file->is_binary) {
1523 /* "Bin XXX -> YYY bytes" */
1524 int w = 14 + decimal_width(file->added)
1525 + decimal_width(file->deleted);
1526 bin_width = bin_width < w ? w : bin_width;
1527 /* Display change counts aligned with "Bin" */
1528 number_width = 3;
1529 continue;
1530 }
1531
1532 if (max_change < change)
1533 max_change = change;
1534 }
1535 count = i; /* where we can stop scanning in data->files[] */
1536
1537 /*
1538 * We have width = stat_width or term_columns() columns total.
1539 * We want a maximum of min(max_len, stat_name_width) for the name part.
1540 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1541 * We also need 1 for " " and 4 + decimal_width(max_change)
1542 * for " | NNNN " and one the empty column at the end, altogether
1543 * 6 + decimal_width(max_change).
1544 *
1545 * If there's not enough space, we will use the smaller of
1546 * stat_name_width (if set) and 5/8*width for the filename,
1547 * and the rest for constant elements + graph part, but no more
1548 * than stat_graph_width for the graph part.
1549 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1550 * for the standard terminal size).
1551 *
1552 * In other words: stat_width limits the maximum width, and
1553 * stat_name_width fixes the maximum width of the filename,
1554 * and is also used to divide available columns if there
1555 * aren't enough.
1556 *
1557 * Binary files are displayed with "Bin XXX -> YYY bytes"
1558 * instead of the change count and graph. This part is treated
1559 * similarly to the graph part, except that it is not
1560 * "scaled". If total width is too small to accommodate the
1561 * guaranteed minimum width of the filename part and the
1562 * separators and this message, this message will "overflow"
1563 * making the line longer than the maximum width.
1564 */
1565
1566 if (options->stat_width == -1)
1567 width = term_columns() - options->output_prefix_length;
1568 else
1569 width = options->stat_width ? options->stat_width : 80;
1570 number_width = decimal_width(max_change) > number_width ?
1571 decimal_width(max_change) : number_width;
1572
1573 if (options->stat_graph_width == -1)
1574 options->stat_graph_width = diff_stat_graph_width;
1575
1576 /*
1577 * Guarantee 3/8*16==6 for the graph part
1578 * and 5/8*16==10 for the filename part
1579 */
1580 if (width < 16 + 6 + number_width)
1581 width = 16 + 6 + number_width;
1582
1583 /*
1584 * First assign sizes that are wanted, ignoring available width.
1585 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1586 * starting from "XXX" should fit in graph_width.
1587 */
1588 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1589 if (options->stat_graph_width &&
1590 options->stat_graph_width < graph_width)
1591 graph_width = options->stat_graph_width;
1592
1593 name_width = (options->stat_name_width > 0 &&
1594 options->stat_name_width < max_len) ?
1595 options->stat_name_width : max_len;
1596
1597 /*
1598 * Adjust adjustable widths not to exceed maximum width
1599 */
1600 if (name_width + number_width + 6 + graph_width > width) {
1601 if (graph_width > width * 3/8 - number_width - 6) {
1602 graph_width = width * 3/8 - number_width - 6;
1603 if (graph_width < 6)
1604 graph_width = 6;
1605 }
1606
1607 if (options->stat_graph_width &&
1608 graph_width > options->stat_graph_width)
1609 graph_width = options->stat_graph_width;
1610 if (name_width > width - number_width - 6 - graph_width)
1611 name_width = width - number_width - 6 - graph_width;
1612 else
1613 graph_width = width - number_width - 6 - name_width;
1614 }
1615
1616 /*
1617 * From here name_width is the width of the name area,
1618 * and graph_width is the width of the graph area.
1619 * max_change is used to scale graph properly.
1620 */
1621 for (i = 0; i < count; i++) {
1622 const char *prefix = "";
1623 struct diffstat_file *file = data->files[i];
1624 char *name = file->print_name;
1625 uintmax_t added = file->added;
1626 uintmax_t deleted = file->deleted;
1627 int name_len;
1628
1629 if (!file->is_interesting && (added + deleted == 0))
1630 continue;
1631
1632 /*
1633 * "scale" the filename
1634 */
1635 len = name_width;
1636 name_len = strlen(name);
1637 if (name_width < name_len) {
1638 char *slash;
1639 prefix = "...";
1640 len -= 3;
1641 name += name_len - len;
1642 slash = strchr(name, '/');
1643 if (slash)
1644 name = slash;
1645 }
1646
1647 if (file->is_binary) {
1648 fprintf(options->file, "%s", line_prefix);
1649 show_name(options->file, prefix, name, len);
1650 fprintf(options->file, " %*s", number_width, "Bin");
1651 if (!added && !deleted) {
1652 putc('\n', options->file);
1653 continue;
1654 }
1655 fprintf(options->file, " %s%"PRIuMAX"%s",
1656 del_c, deleted, reset);
1657 fprintf(options->file, " -> ");
1658 fprintf(options->file, "%s%"PRIuMAX"%s",
1659 add_c, added, reset);
1660 fprintf(options->file, " bytes");
1661 fprintf(options->file, "\n");
1662 continue;
1663 }
1664 else if (file->is_unmerged) {
1665 fprintf(options->file, "%s", line_prefix);
1666 show_name(options->file, prefix, name, len);
1667 fprintf(options->file, " Unmerged\n");
1668 continue;
1669 }
1670
1671 /*
1672 * scale the add/delete
1673 */
1674 add = added;
1675 del = deleted;
1676
1677 if (graph_width <= max_change) {
1678 int total = scale_linear(add + del, graph_width, max_change);
1679 if (total < 2 && add && del)
1680 /* width >= 2 due to the sanity check */
1681 total = 2;
1682 if (add < del) {
1683 add = scale_linear(add, graph_width, max_change);
1684 del = total - add;
1685 } else {
1686 del = scale_linear(del, graph_width, max_change);
1687 add = total - del;
1688 }
1689 }
1690 fprintf(options->file, "%s", line_prefix);
1691 show_name(options->file, prefix, name, len);
1692 fprintf(options->file, " %*"PRIuMAX"%s",
1693 number_width, added + deleted,
1694 added + deleted ? " " : "");
1695 show_graph(options->file, '+', add, add_c, reset);
1696 show_graph(options->file, '-', del, del_c, reset);
1697 fprintf(options->file, "\n");
1698 }
1699
1700 for (i = 0; i < data->nr; i++) {
1701 struct diffstat_file *file = data->files[i];
1702 uintmax_t added = file->added;
1703 uintmax_t deleted = file->deleted;
1704
1705 if (file->is_unmerged ||
1706 (!file->is_interesting && (added + deleted == 0))) {
1707 total_files--;
1708 continue;
1709 }
1710
1711 if (!file->is_binary) {
1712 adds += added;
1713 dels += deleted;
1714 }
1715 if (i < count)
1716 continue;
1717 if (!extra_shown)
1718 fprintf(options->file, "%s ...\n", line_prefix);
1719 extra_shown = 1;
1720 }
1721 fprintf(options->file, "%s", line_prefix);
1722 print_stat_summary(options->file, total_files, adds, dels);
1723 }
1724
1725 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1726 {
1727 int i, adds = 0, dels = 0, total_files = data->nr;
1728
1729 if (data->nr == 0)
1730 return;
1731
1732 for (i = 0; i < data->nr; i++) {
1733 int added = data->files[i]->added;
1734 int deleted= data->files[i]->deleted;
1735
1736 if (data->files[i]->is_unmerged ||
1737 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1738 total_files--;
1739 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1740 adds += added;
1741 dels += deleted;
1742 }
1743 }
1744 fprintf(options->file, "%s", diff_line_prefix(options));
1745 print_stat_summary(options->file, total_files, adds, dels);
1746 }
1747
1748 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1749 {
1750 int i;
1751
1752 if (data->nr == 0)
1753 return;
1754
1755 for (i = 0; i < data->nr; i++) {
1756 struct diffstat_file *file = data->files[i];
1757
1758 fprintf(options->file, "%s", diff_line_prefix(options));
1759
1760 if (file->is_binary)
1761 fprintf(options->file, "-\t-\t");
1762 else
1763 fprintf(options->file,
1764 "%"PRIuMAX"\t%"PRIuMAX"\t",
1765 file->added, file->deleted);
1766 if (options->line_termination) {
1767 fill_print_name(file);
1768 if (!file->is_renamed)
1769 write_name_quoted(file->name, options->file,
1770 options->line_termination);
1771 else {
1772 fputs(file->print_name, options->file);
1773 putc(options->line_termination, options->file);
1774 }
1775 } else {
1776 if (file->is_renamed) {
1777 putc('\0', options->file);
1778 write_name_quoted(file->from_name, options->file, '\0');
1779 }
1780 write_name_quoted(file->name, options->file, '\0');
1781 }
1782 }
1783 }
1784
1785 struct dirstat_file {
1786 const char *name;
1787 unsigned long changed;
1788 };
1789
1790 struct dirstat_dir {
1791 struct dirstat_file *files;
1792 int alloc, nr, permille, cumulative;
1793 };
1794
1795 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1796 unsigned long changed, const char *base, int baselen)
1797 {
1798 unsigned long this_dir = 0;
1799 unsigned int sources = 0;
1800 const char *line_prefix = diff_line_prefix(opt);
1801
1802 while (dir->nr) {
1803 struct dirstat_file *f = dir->files;
1804 int namelen = strlen(f->name);
1805 unsigned long this;
1806 char *slash;
1807
1808 if (namelen < baselen)
1809 break;
1810 if (memcmp(f->name, base, baselen))
1811 break;
1812 slash = strchr(f->name + baselen, '/');
1813 if (slash) {
1814 int newbaselen = slash + 1 - f->name;
1815 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1816 sources++;
1817 } else {
1818 this = f->changed;
1819 dir->files++;
1820 dir->nr--;
1821 sources += 2;
1822 }
1823 this_dir += this;
1824 }
1825
1826 /*
1827 * We don't report dirstat's for
1828 * - the top level
1829 * - or cases where everything came from a single directory
1830 * under this directory (sources == 1).
1831 */
1832 if (baselen && sources != 1) {
1833 if (this_dir) {
1834 int permille = this_dir * 1000 / changed;
1835 if (permille >= dir->permille) {
1836 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1837 permille / 10, permille % 10, baselen, base);
1838 if (!dir->cumulative)
1839 return 0;
1840 }
1841 }
1842 }
1843 return this_dir;
1844 }
1845
1846 static int dirstat_compare(const void *_a, const void *_b)
1847 {
1848 const struct dirstat_file *a = _a;
1849 const struct dirstat_file *b = _b;
1850 return strcmp(a->name, b->name);
1851 }
1852
1853 static void show_dirstat(struct diff_options *options)
1854 {
1855 int i;
1856 unsigned long changed;
1857 struct dirstat_dir dir;
1858 struct diff_queue_struct *q = &diff_queued_diff;
1859
1860 dir.files = NULL;
1861 dir.alloc = 0;
1862 dir.nr = 0;
1863 dir.permille = options->dirstat_permille;
1864 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1865
1866 changed = 0;
1867 for (i = 0; i < q->nr; i++) {
1868 struct diff_filepair *p = q->queue[i];
1869 const char *name;
1870 unsigned long copied, added, damage;
1871 int content_changed;
1872
1873 name = p->two->path ? p->two->path : p->one->path;
1874
1875 if (p->one->sha1_valid && p->two->sha1_valid)
1876 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1877 else
1878 content_changed = 1;
1879
1880 if (!content_changed) {
1881 /*
1882 * The SHA1 has not changed, so pre-/post-content is
1883 * identical. We can therefore skip looking at the
1884 * file contents altogether.
1885 */
1886 damage = 0;
1887 goto found_damage;
1888 }
1889
1890 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1891 /*
1892 * In --dirstat-by-file mode, we don't really need to
1893 * look at the actual file contents at all.
1894 * The fact that the SHA1 changed is enough for us to
1895 * add this file to the list of results
1896 * (with each file contributing equal damage).
1897 */
1898 damage = 1;
1899 goto found_damage;
1900 }
1901
1902 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1903 diff_populate_filespec(p->one, 0);
1904 diff_populate_filespec(p->two, 0);
1905 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1906 &copied, &added);
1907 diff_free_filespec_data(p->one);
1908 diff_free_filespec_data(p->two);
1909 } else if (DIFF_FILE_VALID(p->one)) {
1910 diff_populate_filespec(p->one, 1);
1911 copied = added = 0;
1912 diff_free_filespec_data(p->one);
1913 } else if (DIFF_FILE_VALID(p->two)) {
1914 diff_populate_filespec(p->two, 1);
1915 copied = 0;
1916 added = p->two->size;
1917 diff_free_filespec_data(p->two);
1918 } else
1919 continue;
1920
1921 /*
1922 * Original minus copied is the removed material,
1923 * added is the new material. They are both damages
1924 * made to the preimage.
1925 * If the resulting damage is zero, we know that
1926 * diffcore_count_changes() considers the two entries to
1927 * be identical, but since content_changed is true, we
1928 * know that there must have been _some_ kind of change,
1929 * so we force all entries to have damage > 0.
1930 */
1931 damage = (p->one->size - copied) + added;
1932 if (!damage)
1933 damage = 1;
1934
1935 found_damage:
1936 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1937 dir.files[dir.nr].name = name;
1938 dir.files[dir.nr].changed = damage;
1939 changed += damage;
1940 dir.nr++;
1941 }
1942
1943 /* This can happen even with many files, if everything was renames */
1944 if (!changed)
1945 return;
1946
1947 /* Show all directories with more than x% of the changes */
1948 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1949 gather_dirstat(options, &dir, changed, "", 0);
1950 }
1951
1952 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1953 {
1954 int i;
1955 unsigned long changed;
1956 struct dirstat_dir dir;
1957
1958 if (data->nr == 0)
1959 return;
1960
1961 dir.files = NULL;
1962 dir.alloc = 0;
1963 dir.nr = 0;
1964 dir.permille = options->dirstat_permille;
1965 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1966
1967 changed = 0;
1968 for (i = 0; i < data->nr; i++) {
1969 struct diffstat_file *file = data->files[i];
1970 unsigned long damage = file->added + file->deleted;
1971 if (file->is_binary)
1972 /*
1973 * binary files counts bytes, not lines. Must find some
1974 * way to normalize binary bytes vs. textual lines.
1975 * The following heuristic assumes that there are 64
1976 * bytes per "line".
1977 * This is stupid and ugly, but very cheap...
1978 */
1979 damage = (damage + 63) / 64;
1980 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1981 dir.files[dir.nr].name = file->name;
1982 dir.files[dir.nr].changed = damage;
1983 changed += damage;
1984 dir.nr++;
1985 }
1986
1987 /* This can happen even with many files, if everything was renames */
1988 if (!changed)
1989 return;
1990
1991 /* Show all directories with more than x% of the changes */
1992 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1993 gather_dirstat(options, &dir, changed, "", 0);
1994 }
1995
1996 static void free_diffstat_info(struct diffstat_t *diffstat)
1997 {
1998 int i;
1999 for (i = 0; i < diffstat->nr; i++) {
2000 struct diffstat_file *f = diffstat->files[i];
2001 if (f->name != f->print_name)
2002 free(f->print_name);
2003 free(f->name);
2004 free(f->from_name);
2005 free(f);
2006 }
2007 free(diffstat->files);
2008 }
2009
2010 struct checkdiff_t {
2011 const char *filename;
2012 int lineno;
2013 int conflict_marker_size;
2014 struct diff_options *o;
2015 unsigned ws_rule;
2016 unsigned status;
2017 };
2018
2019 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2020 {
2021 char firstchar;
2022 int cnt;
2023
2024 if (len < marker_size + 1)
2025 return 0;
2026 firstchar = line[0];
2027 switch (firstchar) {
2028 case '=': case '>': case '<': case '|':
2029 break;
2030 default:
2031 return 0;
2032 }
2033 for (cnt = 1; cnt < marker_size; cnt++)
2034 if (line[cnt] != firstchar)
2035 return 0;
2036 /* line[1] thru line[marker_size-1] are same as firstchar */
2037 if (len < marker_size + 1 || !isspace(line[marker_size]))
2038 return 0;
2039 return 1;
2040 }
2041
2042 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2043 {
2044 struct checkdiff_t *data = priv;
2045 int marker_size = data->conflict_marker_size;
2046 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2047 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2048 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2049 char *err;
2050 const char *line_prefix;
2051
2052 assert(data->o);
2053 line_prefix = diff_line_prefix(data->o);
2054
2055 if (line[0] == '+') {
2056 unsigned bad;
2057 data->lineno++;
2058 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2059 data->status |= 1;
2060 fprintf(data->o->file,
2061 "%s%s:%d: leftover conflict marker\n",
2062 line_prefix, data->filename, data->lineno);
2063 }
2064 bad = ws_check(line + 1, len - 1, data->ws_rule);
2065 if (!bad)
2066 return;
2067 data->status |= bad;
2068 err = whitespace_error_string(bad);
2069 fprintf(data->o->file, "%s%s:%d: %s.\n",
2070 line_prefix, data->filename, data->lineno, err);
2071 free(err);
2072 emit_line(data->o, set, reset, line, 1);
2073 ws_check_emit(line + 1, len - 1, data->ws_rule,
2074 data->o->file, set, reset, ws);
2075 } else if (line[0] == ' ') {
2076 data->lineno++;
2077 } else if (line[0] == '@') {
2078 char *plus = strchr(line, '+');
2079 if (plus)
2080 data->lineno = strtol(plus, NULL, 10) - 1;
2081 else
2082 die("invalid diff");
2083 }
2084 }
2085
2086 static unsigned char *deflate_it(char *data,
2087 unsigned long size,
2088 unsigned long *result_size)
2089 {
2090 int bound;
2091 unsigned char *deflated;
2092 git_zstream stream;
2093
2094 memset(&stream, 0, sizeof(stream));
2095 git_deflate_init(&stream, zlib_compression_level);
2096 bound = git_deflate_bound(&stream, size);
2097 deflated = xmalloc(bound);
2098 stream.next_out = deflated;
2099 stream.avail_out = bound;
2100
2101 stream.next_in = (unsigned char *)data;
2102 stream.avail_in = size;
2103 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2104 ; /* nothing */
2105 git_deflate_end(&stream);
2106 *result_size = stream.total_out;
2107 return deflated;
2108 }
2109
2110 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2111 const char *prefix)
2112 {
2113 void *cp;
2114 void *delta;
2115 void *deflated;
2116 void *data;
2117 unsigned long orig_size;
2118 unsigned long delta_size;
2119 unsigned long deflate_size;
2120 unsigned long data_size;
2121
2122 /* We could do deflated delta, or we could do just deflated two,
2123 * whichever is smaller.
2124 */
2125 delta = NULL;
2126 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2127 if (one->size && two->size) {
2128 delta = diff_delta(one->ptr, one->size,
2129 two->ptr, two->size,
2130 &delta_size, deflate_size);
2131 if (delta) {
2132 void *to_free = delta;
2133 orig_size = delta_size;
2134 delta = deflate_it(delta, delta_size, &delta_size);
2135 free(to_free);
2136 }
2137 }
2138
2139 if (delta && delta_size < deflate_size) {
2140 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2141 free(deflated);
2142 data = delta;
2143 data_size = delta_size;
2144 }
2145 else {
2146 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2147 free(delta);
2148 data = deflated;
2149 data_size = deflate_size;
2150 }
2151
2152 /* emit data encoded in base85 */
2153 cp = data;
2154 while (data_size) {
2155 int bytes = (52 < data_size) ? 52 : data_size;
2156 char line[70];
2157 data_size -= bytes;
2158 if (bytes <= 26)
2159 line[0] = bytes + 'A' - 1;
2160 else
2161 line[0] = bytes - 26 + 'a' - 1;
2162 encode_85(line + 1, cp, bytes);
2163 cp = (char *) cp + bytes;
2164 fprintf(file, "%s", prefix);
2165 fputs(line, file);
2166 fputc('\n', file);
2167 }
2168 fprintf(file, "%s\n", prefix);
2169 free(data);
2170 }
2171
2172 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2173 const char *prefix)
2174 {
2175 fprintf(file, "%sGIT binary patch\n", prefix);
2176 emit_binary_diff_body(file, one, two, prefix);
2177 emit_binary_diff_body(file, two, one, prefix);
2178 }
2179
2180 int diff_filespec_is_binary(struct diff_filespec *one)
2181 {
2182 if (one->is_binary == -1) {
2183 diff_filespec_load_driver(one);
2184 if (one->driver->binary != -1)
2185 one->is_binary = one->driver->binary;
2186 else {
2187 if (!one->data && DIFF_FILE_VALID(one))
2188 diff_populate_filespec(one, 0);
2189 if (one->data)
2190 one->is_binary = buffer_is_binary(one->data,
2191 one->size);
2192 if (one->is_binary == -1)
2193 one->is_binary = 0;
2194 }
2195 }
2196 return one->is_binary;
2197 }
2198
2199 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2200 {
2201 diff_filespec_load_driver(one);
2202 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2203 }
2204
2205 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2206 {
2207 if (!options->a_prefix)
2208 options->a_prefix = a;
2209 if (!options->b_prefix)
2210 options->b_prefix = b;
2211 }
2212
2213 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2214 {
2215 if (!DIFF_FILE_VALID(one))
2216 return NULL;
2217
2218 diff_filespec_load_driver(one);
2219 return userdiff_get_textconv(one->driver);
2220 }
2221
2222 static void builtin_diff(const char *name_a,
2223 const char *name_b,
2224 struct diff_filespec *one,
2225 struct diff_filespec *two,
2226 const char *xfrm_msg,
2227 int must_show_header,
2228 struct diff_options *o,
2229 int complete_rewrite)
2230 {
2231 mmfile_t mf1, mf2;
2232 const char *lbl[2];
2233 char *a_one, *b_two;
2234 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2235 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2236 const char *a_prefix, *b_prefix;
2237 struct userdiff_driver *textconv_one = NULL;
2238 struct userdiff_driver *textconv_two = NULL;
2239 struct strbuf header = STRBUF_INIT;
2240 const char *line_prefix = diff_line_prefix(o);
2241
2242 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2243 (!one->mode || S_ISGITLINK(one->mode)) &&
2244 (!two->mode || S_ISGITLINK(two->mode))) {
2245 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2246 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2247 show_submodule_summary(o->file, one->path ? one->path : two->path,
2248 line_prefix,
2249 one->sha1, two->sha1, two->dirty_submodule,
2250 meta, del, add, reset);
2251 return;
2252 }
2253
2254 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2255 textconv_one = get_textconv(one);
2256 textconv_two = get_textconv(two);
2257 }
2258
2259 diff_set_mnemonic_prefix(o, "a/", "b/");
2260 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2261 a_prefix = o->b_prefix;
2262 b_prefix = o->a_prefix;
2263 } else {
2264 a_prefix = o->a_prefix;
2265 b_prefix = o->b_prefix;
2266 }
2267
2268 /* Never use a non-valid filename anywhere if at all possible */
2269 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2270 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2271
2272 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2273 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2274 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2275 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2276 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2277 if (lbl[0][0] == '/') {
2278 /* /dev/null */
2279 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2280 if (xfrm_msg)
2281 strbuf_addstr(&header, xfrm_msg);
2282 must_show_header = 1;
2283 }
2284 else if (lbl[1][0] == '/') {
2285 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2286 if (xfrm_msg)
2287 strbuf_addstr(&header, xfrm_msg);
2288 must_show_header = 1;
2289 }
2290 else {
2291 if (one->mode != two->mode) {
2292 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2293 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2294 must_show_header = 1;
2295 }
2296 if (xfrm_msg)
2297 strbuf_addstr(&header, xfrm_msg);
2298
2299 /*
2300 * we do not run diff between different kind
2301 * of objects.
2302 */
2303 if ((one->mode ^ two->mode) & S_IFMT)
2304 goto free_ab_and_return;
2305 if (complete_rewrite &&
2306 (textconv_one || !diff_filespec_is_binary(one)) &&
2307 (textconv_two || !diff_filespec_is_binary(two))) {
2308 fprintf(o->file, "%s", header.buf);
2309 strbuf_reset(&header);
2310 emit_rewrite_diff(name_a, name_b, one, two,
2311 textconv_one, textconv_two, o);
2312 o->found_changes = 1;
2313 goto free_ab_and_return;
2314 }
2315 }
2316
2317 if (o->irreversible_delete && lbl[1][0] == '/') {
2318 fprintf(o->file, "%s", header.buf);
2319 strbuf_reset(&header);
2320 goto free_ab_and_return;
2321 } else if (!DIFF_OPT_TST(o, TEXT) &&
2322 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2323 (!textconv_two && diff_filespec_is_binary(two)) )) {
2324 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2325 die("unable to read files to diff");
2326 /* Quite common confusing case */
2327 if (mf1.size == mf2.size &&
2328 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2329 if (must_show_header)
2330 fprintf(o->file, "%s", header.buf);
2331 goto free_ab_and_return;
2332 }
2333 fprintf(o->file, "%s", header.buf);
2334 strbuf_reset(&header);
2335 if (DIFF_OPT_TST(o, BINARY))
2336 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2337 else
2338 fprintf(o->file, "%sBinary files %s and %s differ\n",
2339 line_prefix, lbl[0], lbl[1]);
2340 o->found_changes = 1;
2341 } else {
2342 /* Crazy xdl interfaces.. */
2343 const char *diffopts = getenv("GIT_DIFF_OPTS");
2344 xpparam_t xpp;
2345 xdemitconf_t xecfg;
2346 struct emit_callback ecbdata;
2347 const struct userdiff_funcname *pe;
2348
2349 if (must_show_header) {
2350 fprintf(o->file, "%s", header.buf);
2351 strbuf_reset(&header);
2352 }
2353
2354 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2355 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2356
2357 pe = diff_funcname_pattern(one);
2358 if (!pe)
2359 pe = diff_funcname_pattern(two);
2360
2361 memset(&xpp, 0, sizeof(xpp));
2362 memset(&xecfg, 0, sizeof(xecfg));
2363 memset(&ecbdata, 0, sizeof(ecbdata));
2364 ecbdata.label_path = lbl;
2365 ecbdata.color_diff = want_color(o->use_color);
2366 ecbdata.found_changesp = &o->found_changes;
2367 ecbdata.ws_rule = whitespace_rule(name_b);
2368 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2369 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2370 ecbdata.opt = o;
2371 ecbdata.header = header.len ? &header : NULL;
2372 xpp.flags = o->xdl_opts;
2373 xecfg.ctxlen = o->context;
2374 xecfg.interhunkctxlen = o->interhunkcontext;
2375 xecfg.flags = XDL_EMIT_FUNCNAMES;
2376 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2377 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2378 if (pe)
2379 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2380 if (!diffopts)
2381 ;
2382 else if (starts_with(diffopts, "--unified="))
2383 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2384 else if (starts_with(diffopts, "-u"))
2385 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2386 if (o->word_diff)
2387 init_diff_words_data(&ecbdata, o, one, two);
2388 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2389 &xpp, &xecfg);
2390 if (o->word_diff)
2391 free_diff_words_data(&ecbdata);
2392 if (textconv_one)
2393 free(mf1.ptr);
2394 if (textconv_two)
2395 free(mf2.ptr);
2396 xdiff_clear_find_func(&xecfg);
2397 }
2398
2399 free_ab_and_return:
2400 strbuf_release(&header);
2401 diff_free_filespec_data(one);
2402 diff_free_filespec_data(two);
2403 free(a_one);
2404 free(b_two);
2405 return;
2406 }
2407
2408 static void builtin_diffstat(const char *name_a, const char *name_b,
2409 struct diff_filespec *one,
2410 struct diff_filespec *two,
2411 struct diffstat_t *diffstat,
2412 struct diff_options *o,
2413 struct diff_filepair *p)
2414 {
2415 mmfile_t mf1, mf2;
2416 struct diffstat_file *data;
2417 int same_contents;
2418 int complete_rewrite = 0;
2419
2420 if (!DIFF_PAIR_UNMERGED(p)) {
2421 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2422 complete_rewrite = 1;
2423 }
2424
2425 data = diffstat_add(diffstat, name_a, name_b);
2426 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2427
2428 if (!one || !two) {
2429 data->is_unmerged = 1;
2430 return;
2431 }
2432
2433 same_contents = !hashcmp(one->sha1, two->sha1);
2434
2435 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2436 data->is_binary = 1;
2437 if (same_contents) {
2438 data->added = 0;
2439 data->deleted = 0;
2440 } else {
2441 data->added = diff_filespec_size(two);
2442 data->deleted = diff_filespec_size(one);
2443 }
2444 }
2445
2446 else if (complete_rewrite) {
2447 diff_populate_filespec(one, 0);
2448 diff_populate_filespec(two, 0);
2449 data->deleted = count_lines(one->data, one->size);
2450 data->added = count_lines(two->data, two->size);
2451 }
2452
2453 else if (!same_contents) {
2454 /* Crazy xdl interfaces.. */
2455 xpparam_t xpp;
2456 xdemitconf_t xecfg;
2457
2458 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2459 die("unable to read files to diff");
2460
2461 memset(&xpp, 0, sizeof(xpp));
2462 memset(&xecfg, 0, sizeof(xecfg));
2463 xpp.flags = o->xdl_opts;
2464 xecfg.ctxlen = o->context;
2465 xecfg.interhunkctxlen = o->interhunkcontext;
2466 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2467 &xpp, &xecfg);
2468 }
2469
2470 diff_free_filespec_data(one);
2471 diff_free_filespec_data(two);
2472 }
2473
2474 static void builtin_checkdiff(const char *name_a, const char *name_b,
2475 const char *attr_path,
2476 struct diff_filespec *one,
2477 struct diff_filespec *two,
2478 struct diff_options *o)
2479 {
2480 mmfile_t mf1, mf2;
2481 struct checkdiff_t data;
2482
2483 if (!two)
2484 return;
2485
2486 memset(&data, 0, sizeof(data));
2487 data.filename = name_b ? name_b : name_a;
2488 data.lineno = 0;
2489 data.o = o;
2490 data.ws_rule = whitespace_rule(attr_path);
2491 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2492
2493 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2494 die("unable to read files to diff");
2495
2496 /*
2497 * All the other codepaths check both sides, but not checking
2498 * the "old" side here is deliberate. We are checking the newly
2499 * introduced changes, and as long as the "new" side is text, we
2500 * can and should check what it introduces.
2501 */
2502 if (diff_filespec_is_binary(two))
2503 goto free_and_return;
2504 else {
2505 /* Crazy xdl interfaces.. */
2506 xpparam_t xpp;
2507 xdemitconf_t xecfg;
2508
2509 memset(&xpp, 0, sizeof(xpp));
2510 memset(&xecfg, 0, sizeof(xecfg));
2511 xecfg.ctxlen = 1; /* at least one context line */
2512 xpp.flags = 0;
2513 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2514 &xpp, &xecfg);
2515
2516 if (data.ws_rule & WS_BLANK_AT_EOF) {
2517 struct emit_callback ecbdata;
2518 int blank_at_eof;
2519
2520 ecbdata.ws_rule = data.ws_rule;
2521 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2522 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2523
2524 if (blank_at_eof) {
2525 static char *err;
2526 if (!err)
2527 err = whitespace_error_string(WS_BLANK_AT_EOF);
2528 fprintf(o->file, "%s:%d: %s.\n",
2529 data.filename, blank_at_eof, err);
2530 data.status = 1; /* report errors */
2531 }
2532 }
2533 }
2534 free_and_return:
2535 diff_free_filespec_data(one);
2536 diff_free_filespec_data(two);
2537 if (data.status)
2538 DIFF_OPT_SET(o, CHECK_FAILED);
2539 }
2540
2541 struct diff_filespec *alloc_filespec(const char *path)
2542 {
2543 int namelen = strlen(path);
2544 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2545
2546 memset(spec, 0, sizeof(*spec));
2547 spec->path = (char *)(spec + 1);
2548 memcpy(spec->path, path, namelen+1);
2549 spec->count = 1;
2550 spec->is_binary = -1;
2551 return spec;
2552 }
2553
2554 void free_filespec(struct diff_filespec *spec)
2555 {
2556 if (!--spec->count) {
2557 diff_free_filespec_data(spec);
2558 free(spec);
2559 }
2560 }
2561
2562 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2563 int sha1_valid, unsigned short mode)
2564 {
2565 if (mode) {
2566 spec->mode = canon_mode(mode);
2567 hashcpy(spec->sha1, sha1);
2568 spec->sha1_valid = sha1_valid;
2569 }
2570 }
2571
2572 /*
2573 * Given a name and sha1 pair, if the index tells us the file in
2574 * the work tree has that object contents, return true, so that
2575 * prepare_temp_file() does not have to inflate and extract.
2576 */
2577 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2578 {
2579 const struct cache_entry *ce;
2580 struct stat st;
2581 int pos, len;
2582
2583 /*
2584 * We do not read the cache ourselves here, because the
2585 * benchmark with my previous version that always reads cache
2586 * shows that it makes things worse for diff-tree comparing
2587 * two linux-2.6 kernel trees in an already checked out work
2588 * tree. This is because most diff-tree comparisons deal with
2589 * only a small number of files, while reading the cache is
2590 * expensive for a large project, and its cost outweighs the
2591 * savings we get by not inflating the object to a temporary
2592 * file. Practically, this code only helps when we are used
2593 * by diff-cache --cached, which does read the cache before
2594 * calling us.
2595 */
2596 if (!active_cache)
2597 return 0;
2598
2599 /* We want to avoid the working directory if our caller
2600 * doesn't need the data in a normal file, this system
2601 * is rather slow with its stat/open/mmap/close syscalls,
2602 * and the object is contained in a pack file. The pack
2603 * is probably already open and will be faster to obtain
2604 * the data through than the working directory. Loose
2605 * objects however would tend to be slower as they need
2606 * to be individually opened and inflated.
2607 */
2608 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2609 return 0;
2610
2611 len = strlen(name);
2612 pos = cache_name_pos(name, len);
2613 if (pos < 0)
2614 return 0;
2615 ce = active_cache[pos];
2616
2617 /*
2618 * This is not the sha1 we are looking for, or
2619 * unreusable because it is not a regular file.
2620 */
2621 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2622 return 0;
2623
2624 /*
2625 * If ce is marked as "assume unchanged", there is no
2626 * guarantee that work tree matches what we are looking for.
2627 */
2628 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2629 return 0;
2630
2631 /*
2632 * If ce matches the file in the work tree, we can reuse it.
2633 */
2634 if (ce_uptodate(ce) ||
2635 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2636 return 1;
2637
2638 return 0;
2639 }
2640
2641 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2642 {
2643 int len;
2644 char *data = xmalloc(100), *dirty = "";
2645
2646 /* Are we looking at the work tree? */
2647 if (s->dirty_submodule)
2648 dirty = "-dirty";
2649
2650 len = snprintf(data, 100,
2651 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2652 s->data = data;
2653 s->size = len;
2654 s->should_free = 1;
2655 if (size_only) {
2656 s->data = NULL;
2657 free(data);
2658 }
2659 return 0;
2660 }
2661
2662 /*
2663 * While doing rename detection and pickaxe operation, we may need to
2664 * grab the data for the blob (or file) for our own in-core comparison.
2665 * diff_filespec has data and size fields for this purpose.
2666 */
2667 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2668 {
2669 int err = 0;
2670 /*
2671 * demote FAIL to WARN to allow inspecting the situation
2672 * instead of refusing.
2673 */
2674 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2675 ? SAFE_CRLF_WARN
2676 : safe_crlf);
2677
2678 if (!DIFF_FILE_VALID(s))
2679 die("internal error: asking to populate invalid file.");
2680 if (S_ISDIR(s->mode))
2681 return -1;
2682
2683 if (s->data)
2684 return 0;
2685
2686 if (size_only && 0 < s->size)
2687 return 0;
2688
2689 if (S_ISGITLINK(s->mode))
2690 return diff_populate_gitlink(s, size_only);
2691
2692 if (!s->sha1_valid ||
2693 reuse_worktree_file(s->path, s->sha1, 0)) {
2694 struct strbuf buf = STRBUF_INIT;
2695 struct stat st;
2696 int fd;
2697
2698 if (lstat(s->path, &st) < 0) {
2699 if (errno == ENOENT) {
2700 err_empty:
2701 err = -1;
2702 empty:
2703 s->data = (char *)"";
2704 s->size = 0;
2705 return err;
2706 }
2707 }
2708 s->size = xsize_t(st.st_size);
2709 if (!s->size)
2710 goto empty;
2711 if (S_ISLNK(st.st_mode)) {
2712 struct strbuf sb = STRBUF_INIT;
2713
2714 if (strbuf_readlink(&sb, s->path, s->size))
2715 goto err_empty;
2716 s->size = sb.len;
2717 s->data = strbuf_detach(&sb, NULL);
2718 s->should_free = 1;
2719 return 0;
2720 }
2721 if (size_only)
2722 return 0;
2723 fd = open(s->path, O_RDONLY);
2724 if (fd < 0)
2725 goto err_empty;
2726 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2727 close(fd);
2728 s->should_munmap = 1;
2729
2730 /*
2731 * Convert from working tree format to canonical git format
2732 */
2733 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2734 size_t size = 0;
2735 munmap(s->data, s->size);
2736 s->should_munmap = 0;
2737 s->data = strbuf_detach(&buf, &size);
2738 s->size = size;
2739 s->should_free = 1;
2740 }
2741 }
2742 else {
2743 enum object_type type;
2744 if (size_only) {
2745 type = sha1_object_info(s->sha1, &s->size);
2746 if (type < 0)
2747 die("unable to read %s", sha1_to_hex(s->sha1));
2748 } else {
2749 s->data = read_sha1_file(s->sha1, &type, &s->size);
2750 if (!s->data)
2751 die("unable to read %s", sha1_to_hex(s->sha1));
2752 s->should_free = 1;
2753 }
2754 }
2755 return 0;
2756 }
2757
2758 void diff_free_filespec_blob(struct diff_filespec *s)
2759 {
2760 if (s->should_free)
2761 free(s->data);
2762 else if (s->should_munmap)
2763 munmap(s->data, s->size);
2764
2765 if (s->should_free || s->should_munmap) {
2766 s->should_free = s->should_munmap = 0;
2767 s->data = NULL;
2768 }
2769 }
2770
2771 void diff_free_filespec_data(struct diff_filespec *s)
2772 {
2773 diff_free_filespec_blob(s);
2774 free(s->cnt_data);
2775 s->cnt_data = NULL;
2776 }
2777
2778 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2779 void *blob,
2780 unsigned long size,
2781 const unsigned char *sha1,
2782 int mode)
2783 {
2784 int fd;
2785 struct strbuf buf = STRBUF_INIT;
2786 struct strbuf template = STRBUF_INIT;
2787 char *path_dup = xstrdup(path);
2788 const char *base = basename(path_dup);
2789
2790 /* Generate "XXXXXX_basename.ext" */
2791 strbuf_addstr(&template, "XXXXXX_");
2792 strbuf_addstr(&template, base);
2793
2794 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2795 strlen(base) + 1);
2796 if (fd < 0)
2797 die_errno("unable to create temp-file");
2798 if (convert_to_working_tree(path,
2799 (const char *)blob, (size_t)size, &buf)) {
2800 blob = buf.buf;
2801 size = buf.len;
2802 }
2803 if (write_in_full(fd, blob, size) != size)
2804 die_errno("unable to write temp-file");
2805 close(fd);
2806 temp->name = temp->tmp_path;
2807 strcpy(temp->hex, sha1_to_hex(sha1));
2808 temp->hex[40] = 0;
2809 sprintf(temp->mode, "%06o", mode);
2810 strbuf_release(&buf);
2811 strbuf_release(&template);
2812 free(path_dup);
2813 }
2814
2815 static struct diff_tempfile *prepare_temp_file(const char *name,
2816 struct diff_filespec *one)
2817 {
2818 struct diff_tempfile *temp = claim_diff_tempfile();
2819
2820 if (!DIFF_FILE_VALID(one)) {
2821 not_a_valid_file:
2822 /* A '-' entry produces this for file-2, and
2823 * a '+' entry produces this for file-1.
2824 */
2825 temp->name = "/dev/null";
2826 strcpy(temp->hex, ".");
2827 strcpy(temp->mode, ".");
2828 return temp;
2829 }
2830
2831 if (!remove_tempfile_installed) {
2832 atexit(remove_tempfile);
2833 sigchain_push_common(remove_tempfile_on_signal);
2834 remove_tempfile_installed = 1;
2835 }
2836
2837 if (!S_ISGITLINK(one->mode) &&
2838 (!one->sha1_valid ||
2839 reuse_worktree_file(name, one->sha1, 1))) {
2840 struct stat st;
2841 if (lstat(name, &st) < 0) {
2842 if (errno == ENOENT)
2843 goto not_a_valid_file;
2844 die_errno("stat(%s)", name);
2845 }
2846 if (S_ISLNK(st.st_mode)) {
2847 struct strbuf sb = STRBUF_INIT;
2848 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2849 die_errno("readlink(%s)", name);
2850 prep_temp_blob(name, temp, sb.buf, sb.len,
2851 (one->sha1_valid ?
2852 one->sha1 : null_sha1),
2853 (one->sha1_valid ?
2854 one->mode : S_IFLNK));
2855 strbuf_release(&sb);
2856 }
2857 else {
2858 /* we can borrow from the file in the work tree */
2859 temp->name = name;
2860 if (!one->sha1_valid)
2861 strcpy(temp->hex, sha1_to_hex(null_sha1));
2862 else
2863 strcpy(temp->hex, sha1_to_hex(one->sha1));
2864 /* Even though we may sometimes borrow the
2865 * contents from the work tree, we always want
2866 * one->mode. mode is trustworthy even when
2867 * !(one->sha1_valid), as long as
2868 * DIFF_FILE_VALID(one).
2869 */
2870 sprintf(temp->mode, "%06o", one->mode);
2871 }
2872 return temp;
2873 }
2874 else {
2875 if (diff_populate_filespec(one, 0))
2876 die("cannot read data blob for %s", one->path);
2877 prep_temp_blob(name, temp, one->data, one->size,
2878 one->sha1, one->mode);
2879 }
2880 return temp;
2881 }
2882
2883 static void add_external_diff_name(struct argv_array *argv,
2884 const char *name,
2885 struct diff_filespec *df)
2886 {
2887 struct diff_tempfile *temp = prepare_temp_file(name, df);
2888 argv_array_push(argv, temp->name);
2889 argv_array_push(argv, temp->hex);
2890 argv_array_push(argv, temp->mode);
2891 }
2892
2893 /* An external diff command takes:
2894 *
2895 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2896 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2897 *
2898 */
2899 static void run_external_diff(const char *pgm,
2900 const char *name,
2901 const char *other,
2902 struct diff_filespec *one,
2903 struct diff_filespec *two,
2904 const char *xfrm_msg,
2905 int complete_rewrite,
2906 struct diff_options *o)
2907 {
2908 struct argv_array argv = ARGV_ARRAY_INIT;
2909 struct argv_array env = ARGV_ARRAY_INIT;
2910 struct diff_queue_struct *q = &diff_queued_diff;
2911
2912 argv_array_push(&argv, pgm);
2913 argv_array_push(&argv, name);
2914
2915 if (one && two) {
2916 add_external_diff_name(&argv, name, one);
2917 if (!other)
2918 add_external_diff_name(&argv, name, two);
2919 else {
2920 add_external_diff_name(&argv, other, two);
2921 argv_array_push(&argv, other);
2922 argv_array_push(&argv, xfrm_msg);
2923 }
2924 }
2925
2926 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
2927 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
2928
2929 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
2930 die(_("external diff died, stopping at %s"), name);
2931
2932 remove_tempfile();
2933 argv_array_clear(&argv);
2934 argv_array_clear(&env);
2935 }
2936
2937 static int similarity_index(struct diff_filepair *p)
2938 {
2939 return p->score * 100 / MAX_SCORE;
2940 }
2941
2942 static void fill_metainfo(struct strbuf *msg,
2943 const char *name,
2944 const char *other,
2945 struct diff_filespec *one,
2946 struct diff_filespec *two,
2947 struct diff_options *o,
2948 struct diff_filepair *p,
2949 int *must_show_header,
2950 int use_color)
2951 {
2952 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2953 const char *reset = diff_get_color(use_color, DIFF_RESET);
2954 const char *line_prefix = diff_line_prefix(o);
2955
2956 *must_show_header = 1;
2957 strbuf_init(msg, PATH_MAX * 2 + 300);
2958 switch (p->status) {
2959 case DIFF_STATUS_COPIED:
2960 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2961 line_prefix, set, similarity_index(p));
2962 strbuf_addf(msg, "%s\n%s%scopy from ",
2963 reset, line_prefix, set);
2964 quote_c_style(name, msg, NULL, 0);
2965 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2966 quote_c_style(other, msg, NULL, 0);
2967 strbuf_addf(msg, "%s\n", reset);
2968 break;
2969 case DIFF_STATUS_RENAMED:
2970 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2971 line_prefix, set, similarity_index(p));
2972 strbuf_addf(msg, "%s\n%s%srename from ",
2973 reset, line_prefix, set);
2974 quote_c_style(name, msg, NULL, 0);
2975 strbuf_addf(msg, "%s\n%s%srename to ",
2976 reset, line_prefix, set);
2977 quote_c_style(other, msg, NULL, 0);
2978 strbuf_addf(msg, "%s\n", reset);
2979 break;
2980 case DIFF_STATUS_MODIFIED:
2981 if (p->score) {
2982 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2983 line_prefix,
2984 set, similarity_index(p), reset);
2985 break;
2986 }
2987 /* fallthru */
2988 default:
2989 *must_show_header = 0;
2990 }
2991 if (one && two && hashcmp(one->sha1, two->sha1)) {
2992 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2993
2994 if (DIFF_OPT_TST(o, BINARY)) {
2995 mmfile_t mf;
2996 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2997 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2998 abbrev = 40;
2999 }
3000 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3001 find_unique_abbrev(one->sha1, abbrev));
3002 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3003 if (one->mode == two->mode)
3004 strbuf_addf(msg, " %06o", one->mode);
3005 strbuf_addf(msg, "%s\n", reset);
3006 }
3007 }
3008
3009 static void run_diff_cmd(const char *pgm,
3010 const char *name,
3011 const char *other,
3012 const char *attr_path,
3013 struct diff_filespec *one,
3014 struct diff_filespec *two,
3015 struct strbuf *msg,
3016 struct diff_options *o,
3017 struct diff_filepair *p)
3018 {
3019 const char *xfrm_msg = NULL;
3020 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3021 int must_show_header = 0;
3022
3023
3024 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3025 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3026 if (drv && drv->external)
3027 pgm = drv->external;
3028 }
3029
3030 if (msg) {
3031 /*
3032 * don't use colors when the header is intended for an
3033 * external diff driver
3034 */
3035 fill_metainfo(msg, name, other, one, two, o, p,
3036 &must_show_header,
3037 want_color(o->use_color) && !pgm);
3038 xfrm_msg = msg->len ? msg->buf : NULL;
3039 }
3040
3041 if (pgm) {
3042 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3043 complete_rewrite, o);
3044 return;
3045 }
3046 if (one && two)
3047 builtin_diff(name, other ? other : name,
3048 one, two, xfrm_msg, must_show_header,
3049 o, complete_rewrite);
3050 else
3051 fprintf(o->file, "* Unmerged path %s\n", name);
3052 }
3053
3054 static void diff_fill_sha1_info(struct diff_filespec *one)
3055 {
3056 if (DIFF_FILE_VALID(one)) {
3057 if (!one->sha1_valid) {
3058 struct stat st;
3059 if (one->is_stdin) {
3060 hashcpy(one->sha1, null_sha1);
3061 return;
3062 }
3063 if (lstat(one->path, &st) < 0)
3064 die_errno("stat '%s'", one->path);
3065 if (index_path(one->sha1, one->path, &st, 0))
3066 die("cannot hash %s", one->path);
3067 }
3068 }
3069 else
3070 hashclr(one->sha1);
3071 }
3072
3073 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3074 {
3075 /* Strip the prefix but do not molest /dev/null and absolute paths */
3076 if (*namep && **namep != '/') {
3077 *namep += prefix_length;
3078 if (**namep == '/')
3079 ++*namep;
3080 }
3081 if (*otherp && **otherp != '/') {
3082 *otherp += prefix_length;
3083 if (**otherp == '/')
3084 ++*otherp;
3085 }
3086 }
3087
3088 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3089 {
3090 const char *pgm = external_diff();
3091 struct strbuf msg;
3092 struct diff_filespec *one = p->one;
3093 struct diff_filespec *two = p->two;
3094 const char *name;
3095 const char *other;
3096 const char *attr_path;
3097
3098 name = p->one->path;
3099 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3100 attr_path = name;
3101 if (o->prefix_length)
3102 strip_prefix(o->prefix_length, &name, &other);
3103
3104 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3105 pgm = NULL;
3106
3107 if (DIFF_PAIR_UNMERGED(p)) {
3108 run_diff_cmd(pgm, name, NULL, attr_path,
3109 NULL, NULL, NULL, o, p);
3110 return;
3111 }
3112
3113 diff_fill_sha1_info(one);
3114 diff_fill_sha1_info(two);
3115
3116 if (!pgm &&
3117 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3118 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3119 /*
3120 * a filepair that changes between file and symlink
3121 * needs to be split into deletion and creation.
3122 */
3123 struct diff_filespec *null = alloc_filespec(two->path);
3124 run_diff_cmd(NULL, name, other, attr_path,
3125 one, null, &msg, o, p);
3126 free(null);
3127 strbuf_release(&msg);
3128
3129 null = alloc_filespec(one->path);
3130 run_diff_cmd(NULL, name, other, attr_path,
3131 null, two, &msg, o, p);
3132 free(null);
3133 }
3134 else
3135 run_diff_cmd(pgm, name, other, attr_path,
3136 one, two, &msg, o, p);
3137
3138 strbuf_release(&msg);
3139 }
3140
3141 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3142 struct diffstat_t *diffstat)
3143 {
3144 const char *name;
3145 const char *other;
3146
3147 if (DIFF_PAIR_UNMERGED(p)) {
3148 /* unmerged */
3149 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3150 return;
3151 }
3152
3153 name = p->one->path;
3154 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3155
3156 if (o->prefix_length)
3157 strip_prefix(o->prefix_length, &name, &other);
3158
3159 diff_fill_sha1_info(p->one);
3160 diff_fill_sha1_info(p->two);
3161
3162 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3163 }
3164
3165 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3166 {
3167 const char *name;
3168 const char *other;
3169 const char *attr_path;
3170
3171 if (DIFF_PAIR_UNMERGED(p)) {
3172 /* unmerged */
3173 return;
3174 }
3175
3176 name = p->one->path;
3177 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3178 attr_path = other ? other : name;
3179
3180 if (o->prefix_length)
3181 strip_prefix(o->prefix_length, &name, &other);
3182
3183 diff_fill_sha1_info(p->one);
3184 diff_fill_sha1_info(p->two);
3185
3186 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3187 }
3188
3189 void diff_setup(struct diff_options *options)
3190 {
3191 memcpy(options, &default_diff_options, sizeof(*options));
3192
3193 options->file = stdout;
3194
3195 options->line_termination = '\n';
3196 options->break_opt = -1;
3197 options->rename_limit = -1;
3198 options->dirstat_permille = diff_dirstat_permille_default;
3199 options->context = diff_context_default;
3200 DIFF_OPT_SET(options, RENAME_EMPTY);
3201
3202 /* pathchange left =NULL by default */
3203 options->change = diff_change;
3204 options->add_remove = diff_addremove;
3205 options->use_color = diff_use_color_default;
3206 options->detect_rename = diff_detect_rename_default;
3207 options->xdl_opts |= diff_algorithm;
3208
3209 options->orderfile = diff_order_file_cfg;
3210
3211 if (diff_no_prefix) {
3212 options->a_prefix = options->b_prefix = "";
3213 } else if (!diff_mnemonic_prefix) {
3214 options->a_prefix = "a/";
3215 options->b_prefix = "b/";
3216 }
3217 }
3218
3219 void diff_setup_done(struct diff_options *options)
3220 {
3221 int count = 0;
3222
3223 if (options->set_default)
3224 options->set_default(options);
3225
3226 if (options->output_format & DIFF_FORMAT_NAME)
3227 count++;
3228 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3229 count++;
3230 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3231 count++;
3232 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3233 count++;
3234 if (count > 1)
3235 die("--name-only, --name-status, --check and -s are mutually exclusive");
3236
3237 /*
3238 * Most of the time we can say "there are changes"
3239 * only by checking if there are changed paths, but
3240 * --ignore-whitespace* options force us to look
3241 * inside contents.
3242 */
3243
3244 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3245 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3246 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3247 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3248 else
3249 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3250
3251 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3252 options->detect_rename = DIFF_DETECT_COPY;
3253
3254 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3255 options->prefix = NULL;
3256 if (options->prefix)
3257 options->prefix_length = strlen(options->prefix);
3258 else
3259 options->prefix_length = 0;
3260
3261 if (options->output_format & (DIFF_FORMAT_NAME |
3262 DIFF_FORMAT_NAME_STATUS |
3263 DIFF_FORMAT_CHECKDIFF |
3264 DIFF_FORMAT_NO_OUTPUT))
3265 options->output_format &= ~(DIFF_FORMAT_RAW |
3266 DIFF_FORMAT_NUMSTAT |
3267 DIFF_FORMAT_DIFFSTAT |
3268 DIFF_FORMAT_SHORTSTAT |
3269 DIFF_FORMAT_DIRSTAT |
3270 DIFF_FORMAT_SUMMARY |
3271 DIFF_FORMAT_PATCH);
3272
3273 /*
3274 * These cases always need recursive; we do not drop caller-supplied
3275 * recursive bits for other formats here.
3276 */
3277 if (options->output_format & (DIFF_FORMAT_PATCH |
3278 DIFF_FORMAT_NUMSTAT |
3279 DIFF_FORMAT_DIFFSTAT |
3280 DIFF_FORMAT_SHORTSTAT |
3281 DIFF_FORMAT_DIRSTAT |
3282 DIFF_FORMAT_SUMMARY |
3283 DIFF_FORMAT_CHECKDIFF))
3284 DIFF_OPT_SET(options, RECURSIVE);
3285 /*
3286 * Also pickaxe would not work very well if you do not say recursive
3287 */
3288 if (options->pickaxe)
3289 DIFF_OPT_SET(options, RECURSIVE);
3290 /*
3291 * When patches are generated, submodules diffed against the work tree
3292 * must be checked for dirtiness too so it can be shown in the output
3293 */
3294 if (options->output_format & DIFF_FORMAT_PATCH)
3295 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3296
3297 if (options->detect_rename && options->rename_limit < 0)
3298 options->rename_limit = diff_rename_limit_default;
3299 if (options->setup & DIFF_SETUP_USE_CACHE) {
3300 if (!active_cache)
3301 /* read-cache does not die even when it fails
3302 * so it is safe for us to do this here. Also
3303 * it does not smudge active_cache or active_nr
3304 * when it fails, so we do not have to worry about
3305 * cleaning it up ourselves either.
3306 */
3307 read_cache();
3308 }
3309 if (options->abbrev <= 0 || 40 < options->abbrev)
3310 options->abbrev = 40; /* full */
3311
3312 /*
3313 * It does not make sense to show the first hit we happened
3314 * to have found. It does not make sense not to return with
3315 * exit code in such a case either.
3316 */
3317 if (DIFF_OPT_TST(options, QUICK)) {
3318 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3319 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3320 }
3321
3322 options->diff_path_counter = 0;
3323
3324 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3325 die(_("--follow requires exactly one pathspec"));
3326 }
3327
3328 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3329 {
3330 char c, *eq;
3331 int len;
3332
3333 if (*arg != '-')
3334 return 0;
3335 c = *++arg;
3336 if (!c)
3337 return 0;
3338 if (c == arg_short) {
3339 c = *++arg;
3340 if (!c)
3341 return 1;
3342 if (val && isdigit(c)) {
3343 char *end;
3344 int n = strtoul(arg, &end, 10);
3345 if (*end)
3346 return 0;
3347 *val = n;
3348 return 1;
3349 }
3350 return 0;
3351 }
3352 if (c != '-')
3353 return 0;
3354 arg++;
3355 eq = strchrnul(arg, '=');
3356 len = eq - arg;
3357 if (!len || strncmp(arg, arg_long, len))
3358 return 0;
3359 if (*eq) {
3360 int n;
3361 char *end;
3362 if (!isdigit(*++eq))
3363 return 0;
3364 n = strtoul(eq, &end, 10);
3365 if (*end)
3366 return 0;
3367 *val = n;
3368 }
3369 return 1;
3370 }
3371
3372 static int diff_scoreopt_parse(const char *opt);
3373
3374 static inline int short_opt(char opt, const char **argv,
3375 const char **optarg)
3376 {
3377 const char *arg = argv[0];
3378 if (arg[0] != '-' || arg[1] != opt)
3379 return 0;
3380 if (arg[2] != '\0') {
3381 *optarg = arg + 2;
3382 return 1;
3383 }
3384 if (!argv[1])
3385 die("Option '%c' requires a value", opt);
3386 *optarg = argv[1];
3387 return 2;
3388 }
3389
3390 int parse_long_opt(const char *opt, const char **argv,
3391 const char **optarg)
3392 {
3393 const char *arg = argv[0];
3394 if (arg[0] != '-' || arg[1] != '-')
3395 return 0;
3396 arg += strlen("--");
3397 if (!starts_with(arg, opt))
3398 return 0;
3399 arg += strlen(opt);
3400 if (*arg == '=') { /* stuck form: --option=value */
3401 *optarg = arg + 1;
3402 return 1;
3403 }
3404 if (*arg != '\0')
3405 return 0;
3406 /* separate form: --option value */
3407 if (!argv[1])
3408 die("Option '--%s' requires a value", opt);
3409 *optarg = argv[1];
3410 return 2;
3411 }
3412
3413 static int stat_opt(struct diff_options *options, const char **av)
3414 {
3415 const char *arg = av[0];
3416 char *end;
3417 int width = options->stat_width;
3418 int name_width = options->stat_name_width;
3419 int graph_width = options->stat_graph_width;
3420 int count = options->stat_count;
3421 int argcount = 1;
3422
3423 arg += strlen("--stat");
3424 end = (char *)arg;
3425
3426 switch (*arg) {
3427 case '-':
3428 if (starts_with(arg, "-width")) {
3429 arg += strlen("-width");
3430 if (*arg == '=')
3431 width = strtoul(arg + 1, &end, 10);
3432 else if (!*arg && !av[1])
3433 die("Option '--stat-width' requires a value");
3434 else if (!*arg) {
3435 width = strtoul(av[1], &end, 10);
3436 argcount = 2;
3437 }
3438 } else if (starts_with(arg, "-name-width")) {
3439 arg += strlen("-name-width");
3440 if (*arg == '=')
3441 name_width = strtoul(arg + 1, &end, 10);
3442 else if (!*arg && !av[1])
3443 die("Option '--stat-name-width' requires a value");
3444 else if (!*arg) {
3445 name_width = strtoul(av[1], &end, 10);
3446 argcount = 2;
3447 }
3448 } else if (starts_with(arg, "-graph-width")) {
3449 arg += strlen("-graph-width");
3450 if (*arg == '=')
3451 graph_width = strtoul(arg + 1, &end, 10);
3452 else if (!*arg && !av[1])
3453 die("Option '--stat-graph-width' requires a value");
3454 else if (!*arg) {
3455 graph_width = strtoul(av[1], &end, 10);
3456 argcount = 2;
3457 }
3458 } else if (starts_with(arg, "-count")) {
3459 arg += strlen("-count");
3460 if (*arg == '=')
3461 count = strtoul(arg + 1, &end, 10);
3462 else if (!*arg && !av[1])
3463 die("Option '--stat-count' requires a value");
3464 else if (!*arg) {
3465 count = strtoul(av[1], &end, 10);
3466 argcount = 2;
3467 }
3468 }
3469 break;
3470 case '=':
3471 width = strtoul(arg+1, &end, 10);
3472 if (*end == ',')
3473 name_width = strtoul(end+1, &end, 10);
3474 if (*end == ',')
3475 count = strtoul(end+1, &end, 10);
3476 }
3477
3478 /* Important! This checks all the error cases! */
3479 if (*end)
3480 return 0;
3481 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3482 options->stat_name_width = name_width;
3483 options->stat_graph_width = graph_width;
3484 options->stat_width = width;
3485 options->stat_count = count;
3486 return argcount;
3487 }
3488
3489 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3490 {
3491 struct strbuf errmsg = STRBUF_INIT;
3492 if (parse_dirstat_params(options, params, &errmsg))
3493 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3494 errmsg.buf);
3495 strbuf_release(&errmsg);
3496 /*
3497 * The caller knows a dirstat-related option is given from the command
3498 * line; allow it to say "return this_function();"
3499 */
3500 options->output_format |= DIFF_FORMAT_DIRSTAT;
3501 return 1;
3502 }
3503
3504 static int parse_submodule_opt(struct diff_options *options, const char *value)
3505 {
3506 if (parse_submodule_params(options, value))
3507 die(_("Failed to parse --submodule option parameter: '%s'"),
3508 value);
3509 return 1;
3510 }
3511
3512 static const char diff_status_letters[] = {
3513 DIFF_STATUS_ADDED,
3514 DIFF_STATUS_COPIED,
3515 DIFF_STATUS_DELETED,
3516 DIFF_STATUS_MODIFIED,
3517 DIFF_STATUS_RENAMED,
3518 DIFF_STATUS_TYPE_CHANGED,
3519 DIFF_STATUS_UNKNOWN,
3520 DIFF_STATUS_UNMERGED,
3521 DIFF_STATUS_FILTER_AON,
3522 DIFF_STATUS_FILTER_BROKEN,
3523 '\0',
3524 };
3525
3526 static unsigned int filter_bit['Z' + 1];
3527
3528 static void prepare_filter_bits(void)
3529 {
3530 int i;
3531
3532 if (!filter_bit[DIFF_STATUS_ADDED]) {
3533 for (i = 0; diff_status_letters[i]; i++)
3534 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3535 }
3536 }
3537
3538 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3539 {
3540 return opt->filter & filter_bit[(int) status];
3541 }
3542
3543 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3544 {
3545 int i, optch;
3546
3547 prepare_filter_bits();
3548
3549 /*
3550 * If there is a negation e.g. 'd' in the input, and we haven't
3551 * initialized the filter field with another --diff-filter, start
3552 * from full set of bits, except for AON.
3553 */
3554 if (!opt->filter) {
3555 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3556 if (optch < 'a' || 'z' < optch)
3557 continue;
3558 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3559 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3560 break;
3561 }
3562 }
3563
3564 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3565 unsigned int bit;
3566 int negate;
3567
3568 if ('a' <= optch && optch <= 'z') {
3569 negate = 1;
3570 optch = toupper(optch);
3571 } else {
3572 negate = 0;
3573 }
3574
3575 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3576 if (!bit)
3577 return optarg[i];
3578 if (negate)
3579 opt->filter &= ~bit;
3580 else
3581 opt->filter |= bit;
3582 }
3583 return 0;
3584 }
3585
3586 static void enable_patch_output(int *fmt) {
3587 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3588 *fmt |= DIFF_FORMAT_PATCH;
3589 }
3590
3591 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3592 {
3593 const char *arg = av[0];
3594 const char *optarg;
3595 int argcount;
3596
3597 /* Output format options */
3598 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3599 || opt_arg(arg, 'U', "unified", &options->context))
3600 enable_patch_output(&options->output_format);
3601 else if (!strcmp(arg, "--raw"))
3602 options->output_format |= DIFF_FORMAT_RAW;
3603 else if (!strcmp(arg, "--patch-with-raw")) {
3604 enable_patch_output(&options->output_format);
3605 options->output_format |= DIFF_FORMAT_RAW;
3606 } else if (!strcmp(arg, "--numstat"))
3607 options->output_format |= DIFF_FORMAT_NUMSTAT;
3608 else if (!strcmp(arg, "--shortstat"))
3609 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3610 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3611 return parse_dirstat_opt(options, "");
3612 else if (starts_with(arg, "-X"))
3613 return parse_dirstat_opt(options, arg + 2);
3614 else if (starts_with(arg, "--dirstat="))
3615 return parse_dirstat_opt(options, arg + 10);
3616 else if (!strcmp(arg, "--cumulative"))
3617 return parse_dirstat_opt(options, "cumulative");
3618 else if (!strcmp(arg, "--dirstat-by-file"))
3619 return parse_dirstat_opt(options, "files");
3620 else if (starts_with(arg, "--dirstat-by-file=")) {
3621 parse_dirstat_opt(options, "files");
3622 return parse_dirstat_opt(options, arg + 18);
3623 }
3624 else if (!strcmp(arg, "--check"))
3625 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3626 else if (!strcmp(arg, "--summary"))
3627 options->output_format |= DIFF_FORMAT_SUMMARY;
3628 else if (!strcmp(arg, "--patch-with-stat")) {
3629 enable_patch_output(&options->output_format);
3630 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3631 } else if (!strcmp(arg, "--name-only"))
3632 options->output_format |= DIFF_FORMAT_NAME;
3633 else if (!strcmp(arg, "--name-status"))
3634 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3635 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3636 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3637 else if (starts_with(arg, "--stat"))
3638 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3639 return stat_opt(options, av);
3640
3641 /* renames options */
3642 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3643 !strcmp(arg, "--break-rewrites")) {
3644 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3645 return error("invalid argument to -B: %s", arg+2);
3646 }
3647 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3648 !strcmp(arg, "--find-renames")) {
3649 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3650 return error("invalid argument to -M: %s", arg+2);
3651 options->detect_rename = DIFF_DETECT_RENAME;
3652 }
3653 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3654 options->irreversible_delete = 1;
3655 }
3656 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3657 !strcmp(arg, "--find-copies")) {
3658 if (options->detect_rename == DIFF_DETECT_COPY)
3659 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3660 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3661 return error("invalid argument to -C: %s", arg+2);
3662 options->detect_rename = DIFF_DETECT_COPY;
3663 }
3664 else if (!strcmp(arg, "--no-renames"))
3665 options->detect_rename = 0;
3666 else if (!strcmp(arg, "--rename-empty"))
3667 DIFF_OPT_SET(options, RENAME_EMPTY);
3668 else if (!strcmp(arg, "--no-rename-empty"))
3669 DIFF_OPT_CLR(options, RENAME_EMPTY);
3670 else if (!strcmp(arg, "--relative"))
3671 DIFF_OPT_SET(options, RELATIVE_NAME);
3672 else if (starts_with(arg, "--relative=")) {
3673 DIFF_OPT_SET(options, RELATIVE_NAME);
3674 options->prefix = arg + 11;
3675 }
3676
3677 /* xdiff options */
3678 else if (!strcmp(arg, "--minimal"))
3679 DIFF_XDL_SET(options, NEED_MINIMAL);
3680 else if (!strcmp(arg, "--no-minimal"))
3681 DIFF_XDL_CLR(options, NEED_MINIMAL);
3682 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3683 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3684 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3685 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3686 else if (!strcmp(arg, "--ignore-space-at-eol"))
3687 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3688 else if (!strcmp(arg, "--ignore-blank-lines"))
3689 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3690 else if (!strcmp(arg, "--patience"))
3691 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3692 else if (!strcmp(arg, "--histogram"))
3693 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3694 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3695 long value = parse_algorithm_value(optarg);
3696 if (value < 0)
3697 return error("option diff-algorithm accepts \"myers\", "
3698 "\"minimal\", \"patience\" and \"histogram\"");
3699 /* clear out previous settings */
3700 DIFF_XDL_CLR(options, NEED_MINIMAL);
3701 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3702 options->xdl_opts |= value;
3703 return argcount;
3704 }
3705
3706 /* flags options */
3707 else if (!strcmp(arg, "--binary")) {
3708 enable_patch_output(&options->output_format);
3709 DIFF_OPT_SET(options, BINARY);
3710 }
3711 else if (!strcmp(arg, "--full-index"))
3712 DIFF_OPT_SET(options, FULL_INDEX);
3713 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3714 DIFF_OPT_SET(options, TEXT);
3715 else if (!strcmp(arg, "-R"))
3716 DIFF_OPT_SET(options, REVERSE_DIFF);
3717 else if (!strcmp(arg, "--find-copies-harder"))
3718 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3719 else if (!strcmp(arg, "--follow"))
3720 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3721 else if (!strcmp(arg, "--no-follow"))
3722 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3723 else if (!strcmp(arg, "--color"))
3724 options->use_color = 1;
3725 else if (starts_with(arg, "--color=")) {
3726 int value = git_config_colorbool(NULL, arg+8);
3727 if (value < 0)
3728 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3729 options->use_color = value;
3730 }
3731 else if (!strcmp(arg, "--no-color"))
3732 options->use_color = 0;
3733 else if (!strcmp(arg, "--color-words")) {
3734 options->use_color = 1;
3735 options->word_diff = DIFF_WORDS_COLOR;
3736 }
3737 else if (starts_with(arg, "--color-words=")) {
3738 options->use_color = 1;
3739 options->word_diff = DIFF_WORDS_COLOR;
3740 options->word_regex = arg + 14;
3741 }
3742 else if (!strcmp(arg, "--word-diff")) {
3743 if (options->word_diff == DIFF_WORDS_NONE)
3744 options->word_diff = DIFF_WORDS_PLAIN;
3745 }
3746 else if (starts_with(arg, "--word-diff=")) {
3747 const char *type = arg + 12;
3748 if (!strcmp(type, "plain"))
3749 options->word_diff = DIFF_WORDS_PLAIN;
3750 else if (!strcmp(type, "color")) {
3751 options->use_color = 1;
3752 options->word_diff = DIFF_WORDS_COLOR;
3753 }
3754 else if (!strcmp(type, "porcelain"))
3755 options->word_diff = DIFF_WORDS_PORCELAIN;
3756 else if (!strcmp(type, "none"))
3757 options->word_diff = DIFF_WORDS_NONE;
3758 else
3759 die("bad --word-diff argument: %s", type);
3760 }
3761 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3762 if (options->word_diff == DIFF_WORDS_NONE)
3763 options->word_diff = DIFF_WORDS_PLAIN;
3764 options->word_regex = optarg;
3765 return argcount;
3766 }
3767 else if (!strcmp(arg, "--exit-code"))
3768 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3769 else if (!strcmp(arg, "--quiet"))
3770 DIFF_OPT_SET(options, QUICK);
3771 else if (!strcmp(arg, "--ext-diff"))
3772 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3773 else if (!strcmp(arg, "--no-ext-diff"))
3774 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3775 else if (!strcmp(arg, "--textconv"))
3776 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3777 else if (!strcmp(arg, "--no-textconv"))
3778 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3779 else if (!strcmp(arg, "--ignore-submodules")) {
3780 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3781 handle_ignore_submodules_arg(options, "all");
3782 } else if (starts_with(arg, "--ignore-submodules=")) {
3783 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3784 handle_ignore_submodules_arg(options, arg + 20);
3785 } else if (!strcmp(arg, "--submodule"))
3786 DIFF_OPT_SET(options, SUBMODULE_LOG);
3787 else if (starts_with(arg, "--submodule="))
3788 return parse_submodule_opt(options, arg + 12);
3789
3790 /* misc options */
3791 else if (!strcmp(arg, "-z"))
3792 options->line_termination = 0;
3793 else if ((argcount = short_opt('l', av, &optarg))) {
3794 options->rename_limit = strtoul(optarg, NULL, 10);
3795 return argcount;
3796 }
3797 else if ((argcount = short_opt('S', av, &optarg))) {
3798 options->pickaxe = optarg;
3799 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3800 return argcount;
3801 } else if ((argcount = short_opt('G', av, &optarg))) {
3802 options->pickaxe = optarg;
3803 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3804 return argcount;
3805 }
3806 else if (!strcmp(arg, "--pickaxe-all"))
3807 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3808 else if (!strcmp(arg, "--pickaxe-regex"))
3809 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3810 else if ((argcount = short_opt('O', av, &optarg))) {
3811 options->orderfile = optarg;
3812 return argcount;
3813 }
3814 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3815 int offending = parse_diff_filter_opt(optarg, options);
3816 if (offending)
3817 die("unknown change class '%c' in --diff-filter=%s",
3818 offending, optarg);
3819 return argcount;
3820 }
3821 else if (!strcmp(arg, "--abbrev"))
3822 options->abbrev = DEFAULT_ABBREV;
3823 else if (starts_with(arg, "--abbrev=")) {
3824 options->abbrev = strtoul(arg + 9, NULL, 10);
3825 if (options->abbrev < MINIMUM_ABBREV)
3826 options->abbrev = MINIMUM_ABBREV;
3827 else if (40 < options->abbrev)
3828 options->abbrev = 40;
3829 }
3830 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3831 options->a_prefix = optarg;
3832 return argcount;
3833 }
3834 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3835 options->b_prefix = optarg;
3836 return argcount;
3837 }
3838 else if (!strcmp(arg, "--no-prefix"))
3839 options->a_prefix = options->b_prefix = "";
3840 else if (opt_arg(arg, '\0', "inter-hunk-context",
3841 &options->interhunkcontext))
3842 ;
3843 else if (!strcmp(arg, "-W"))
3844 DIFF_OPT_SET(options, FUNCCONTEXT);
3845 else if (!strcmp(arg, "--function-context"))
3846 DIFF_OPT_SET(options, FUNCCONTEXT);
3847 else if (!strcmp(arg, "--no-function-context"))
3848 DIFF_OPT_CLR(options, FUNCCONTEXT);
3849 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3850 options->file = fopen(optarg, "w");
3851 if (!options->file)
3852 die_errno("Could not open '%s'", optarg);
3853 options->close_file = 1;
3854 return argcount;
3855 } else
3856 return 0;
3857 return 1;
3858 }
3859
3860 int parse_rename_score(const char **cp_p)
3861 {
3862 unsigned long num, scale;
3863 int ch, dot;
3864 const char *cp = *cp_p;
3865
3866 num = 0;
3867 scale = 1;
3868 dot = 0;
3869 for (;;) {
3870 ch = *cp;
3871 if ( !dot && ch == '.' ) {
3872 scale = 1;
3873 dot = 1;
3874 } else if ( ch == '%' ) {
3875 scale = dot ? scale*100 : 100;
3876 cp++; /* % is always at the end */
3877 break;
3878 } else if ( ch >= '0' && ch <= '9' ) {
3879 if ( scale < 100000 ) {
3880 scale *= 10;
3881 num = (num*10) + (ch-'0');
3882 }
3883 } else {
3884 break;
3885 }
3886 cp++;
3887 }
3888 *cp_p = cp;
3889
3890 /* user says num divided by scale and we say internally that
3891 * is MAX_SCORE * num / scale.
3892 */
3893 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3894 }
3895
3896 static int diff_scoreopt_parse(const char *opt)
3897 {
3898 int opt1, opt2, cmd;
3899
3900 if (*opt++ != '-')
3901 return -1;
3902 cmd = *opt++;
3903 if (cmd == '-') {
3904 /* convert the long-form arguments into short-form versions */
3905 if (starts_with(opt, "break-rewrites")) {
3906 opt += strlen("break-rewrites");
3907 if (*opt == 0 || *opt++ == '=')
3908 cmd = 'B';
3909 } else if (starts_with(opt, "find-copies")) {
3910 opt += strlen("find-copies");
3911 if (*opt == 0 || *opt++ == '=')
3912 cmd = 'C';
3913 } else if (starts_with(opt, "find-renames")) {
3914 opt += strlen("find-renames");
3915 if (*opt == 0 || *opt++ == '=')
3916 cmd = 'M';
3917 }
3918 }
3919 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3920 return -1; /* that is not a -M, -C, or -B option */
3921
3922 opt1 = parse_rename_score(&opt);
3923 if (cmd != 'B')
3924 opt2 = 0;
3925 else {
3926 if (*opt == 0)
3927 opt2 = 0;
3928 else if (*opt != '/')
3929 return -1; /* we expect -B80/99 or -B80 */
3930 else {
3931 opt++;
3932 opt2 = parse_rename_score(&opt);
3933 }
3934 }
3935 if (*opt != 0)
3936 return -1;
3937 return opt1 | (opt2 << 16);
3938 }
3939
3940 struct diff_queue_struct diff_queued_diff;
3941
3942 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3943 {
3944 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
3945 queue->queue[queue->nr++] = dp;
3946 }
3947
3948 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3949 struct diff_filespec *one,
3950 struct diff_filespec *two)
3951 {
3952 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3953 dp->one = one;
3954 dp->two = two;
3955 if (queue)
3956 diff_q(queue, dp);
3957 return dp;
3958 }
3959
3960 void diff_free_filepair(struct diff_filepair *p)
3961 {
3962 free_filespec(p->one);
3963 free_filespec(p->two);
3964 free(p);
3965 }
3966
3967 /* This is different from find_unique_abbrev() in that
3968 * it stuffs the result with dots for alignment.
3969 */
3970 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3971 {
3972 int abblen;
3973 const char *abbrev;
3974 if (len == 40)
3975 return sha1_to_hex(sha1);
3976
3977 abbrev = find_unique_abbrev(sha1, len);
3978 abblen = strlen(abbrev);
3979 if (abblen < 37) {
3980 static char hex[41];
3981 if (len < abblen && abblen <= len + 2)
3982 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3983 else
3984 sprintf(hex, "%s...", abbrev);
3985 return hex;
3986 }
3987 return sha1_to_hex(sha1);
3988 }
3989
3990 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3991 {
3992 int line_termination = opt->line_termination;
3993 int inter_name_termination = line_termination ? '\t' : '\0';
3994
3995 fprintf(opt->file, "%s", diff_line_prefix(opt));
3996 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3997 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3998 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3999 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
4000 }
4001 if (p->score) {
4002 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4003 inter_name_termination);
4004 } else {
4005 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4006 }
4007
4008 if (p->status == DIFF_STATUS_COPIED ||
4009 p->status == DIFF_STATUS_RENAMED) {
4010 const char *name_a, *name_b;
4011 name_a = p->one->path;
4012 name_b = p->two->path;
4013 strip_prefix(opt->prefix_length, &name_a, &name_b);
4014 write_name_quoted(name_a, opt->file, inter_name_termination);
4015 write_name_quoted(name_b, opt->file, line_termination);
4016 } else {
4017 const char *name_a, *name_b;
4018 name_a = p->one->mode ? p->one->path : p->two->path;
4019 name_b = NULL;
4020 strip_prefix(opt->prefix_length, &name_a, &name_b);
4021 write_name_quoted(name_a, opt->file, line_termination);
4022 }
4023 }
4024
4025 int diff_unmodified_pair(struct diff_filepair *p)
4026 {
4027 /* This function is written stricter than necessary to support
4028 * the currently implemented transformers, but the idea is to
4029 * let transformers to produce diff_filepairs any way they want,
4030 * and filter and clean them up here before producing the output.
4031 */
4032 struct diff_filespec *one = p->one, *two = p->two;
4033
4034 if (DIFF_PAIR_UNMERGED(p))
4035 return 0; /* unmerged is interesting */
4036
4037 /* deletion, addition, mode or type change
4038 * and rename are all interesting.
4039 */
4040 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4041 DIFF_PAIR_MODE_CHANGED(p) ||
4042 strcmp(one->path, two->path))
4043 return 0;
4044
4045 /* both are valid and point at the same path. that is, we are
4046 * dealing with a change.
4047 */
4048 if (one->sha1_valid && two->sha1_valid &&
4049 !hashcmp(one->sha1, two->sha1) &&
4050 !one->dirty_submodule && !two->dirty_submodule)
4051 return 1; /* no change */
4052 if (!one->sha1_valid && !two->sha1_valid)
4053 return 1; /* both look at the same file on the filesystem. */
4054 return 0;
4055 }
4056
4057 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4058 {
4059 if (diff_unmodified_pair(p))
4060 return;
4061
4062 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4063 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4064 return; /* no tree diffs in patch format */
4065
4066 run_diff(p, o);
4067 }
4068
4069 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4070 struct diffstat_t *diffstat)
4071 {
4072 if (diff_unmodified_pair(p))
4073 return;
4074
4075 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4076 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4077 return; /* no useful stat for tree diffs */
4078
4079 run_diffstat(p, o, diffstat);
4080 }
4081
4082 static void diff_flush_checkdiff(struct diff_filepair *p,
4083 struct diff_options *o)
4084 {
4085 if (diff_unmodified_pair(p))
4086 return;
4087
4088 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4089 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4090 return; /* nothing to check in tree diffs */
4091
4092 run_checkdiff(p, o);
4093 }
4094
4095 int diff_queue_is_empty(void)
4096 {
4097 struct diff_queue_struct *q = &diff_queued_diff;
4098 int i;
4099 for (i = 0; i < q->nr; i++)
4100 if (!diff_unmodified_pair(q->queue[i]))
4101 return 0;
4102 return 1;
4103 }
4104
4105 #if DIFF_DEBUG
4106 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4107 {
4108 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4109 x, one ? one : "",
4110 s->path,
4111 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4112 s->mode,
4113 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4114 fprintf(stderr, "queue[%d] %s size %lu\n",
4115 x, one ? one : "",
4116 s->size);
4117 }
4118
4119 void diff_debug_filepair(const struct diff_filepair *p, int i)
4120 {
4121 diff_debug_filespec(p->one, i, "one");
4122 diff_debug_filespec(p->two, i, "two");
4123 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4124 p->score, p->status ? p->status : '?',
4125 p->one->rename_used, p->broken_pair);
4126 }
4127
4128 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4129 {
4130 int i;
4131 if (msg)
4132 fprintf(stderr, "%s\n", msg);
4133 fprintf(stderr, "q->nr = %d\n", q->nr);
4134 for (i = 0; i < q->nr; i++) {
4135 struct diff_filepair *p = q->queue[i];
4136 diff_debug_filepair(p, i);
4137 }
4138 }
4139 #endif
4140
4141 static void diff_resolve_rename_copy(void)
4142 {
4143 int i;
4144 struct diff_filepair *p;
4145 struct diff_queue_struct *q = &diff_queued_diff;
4146
4147 diff_debug_queue("resolve-rename-copy", q);
4148
4149 for (i = 0; i < q->nr; i++) {
4150 p = q->queue[i];
4151 p->status = 0; /* undecided */
4152 if (DIFF_PAIR_UNMERGED(p))
4153 p->status = DIFF_STATUS_UNMERGED;
4154 else if (!DIFF_FILE_VALID(p->one))
4155 p->status = DIFF_STATUS_ADDED;
4156 else if (!DIFF_FILE_VALID(p->two))
4157 p->status = DIFF_STATUS_DELETED;
4158 else if (DIFF_PAIR_TYPE_CHANGED(p))
4159 p->status = DIFF_STATUS_TYPE_CHANGED;
4160
4161 /* from this point on, we are dealing with a pair
4162 * whose both sides are valid and of the same type, i.e.
4163 * either in-place edit or rename/copy edit.
4164 */
4165 else if (DIFF_PAIR_RENAME(p)) {
4166 /*
4167 * A rename might have re-connected a broken
4168 * pair up, causing the pathnames to be the
4169 * same again. If so, that's not a rename at
4170 * all, just a modification..
4171 *
4172 * Otherwise, see if this source was used for
4173 * multiple renames, in which case we decrement
4174 * the count, and call it a copy.
4175 */
4176 if (!strcmp(p->one->path, p->two->path))
4177 p->status = DIFF_STATUS_MODIFIED;
4178 else if (--p->one->rename_used > 0)
4179 p->status = DIFF_STATUS_COPIED;
4180 else
4181 p->status = DIFF_STATUS_RENAMED;
4182 }
4183 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4184 p->one->mode != p->two->mode ||
4185 p->one->dirty_submodule ||
4186 p->two->dirty_submodule ||
4187 is_null_sha1(p->one->sha1))
4188 p->status = DIFF_STATUS_MODIFIED;
4189 else {
4190 /* This is a "no-change" entry and should not
4191 * happen anymore, but prepare for broken callers.
4192 */
4193 error("feeding unmodified %s to diffcore",
4194 p->one->path);
4195 p->status = DIFF_STATUS_UNKNOWN;
4196 }
4197 }
4198 diff_debug_queue("resolve-rename-copy done", q);
4199 }
4200
4201 static int check_pair_status(struct diff_filepair *p)
4202 {
4203 switch (p->status) {
4204 case DIFF_STATUS_UNKNOWN:
4205 return 0;
4206 case 0:
4207 die("internal error in diff-resolve-rename-copy");
4208 default:
4209 return 1;
4210 }
4211 }
4212
4213 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4214 {
4215 int fmt = opt->output_format;
4216
4217 if (fmt & DIFF_FORMAT_CHECKDIFF)
4218 diff_flush_checkdiff(p, opt);
4219 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4220 diff_flush_raw(p, opt);
4221 else if (fmt & DIFF_FORMAT_NAME) {
4222 const char *name_a, *name_b;
4223 name_a = p->two->path;
4224 name_b = NULL;
4225 strip_prefix(opt->prefix_length, &name_a, &name_b);
4226 write_name_quoted(name_a, opt->file, opt->line_termination);
4227 }
4228 }
4229
4230 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4231 {
4232 if (fs->mode)
4233 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4234 else
4235 fprintf(file, " %s ", newdelete);
4236 write_name_quoted(fs->path, file, '\n');
4237 }
4238
4239
4240 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4241 const char *line_prefix)
4242 {
4243 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4244 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4245 p->two->mode, show_name ? ' ' : '\n');
4246 if (show_name) {
4247 write_name_quoted(p->two->path, file, '\n');
4248 }
4249 }
4250 }
4251
4252 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4253 const char *line_prefix)
4254 {
4255 char *names = pprint_rename(p->one->path, p->two->path);
4256
4257 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4258 free(names);
4259 show_mode_change(file, p, 0, line_prefix);
4260 }
4261
4262 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4263 {
4264 FILE *file = opt->file;
4265 const char *line_prefix = diff_line_prefix(opt);
4266
4267 switch(p->status) {
4268 case DIFF_STATUS_DELETED:
4269 fputs(line_prefix, file);
4270 show_file_mode_name(file, "delete", p->one);
4271 break;
4272 case DIFF_STATUS_ADDED:
4273 fputs(line_prefix, file);
4274 show_file_mode_name(file, "create", p->two);
4275 break;
4276 case DIFF_STATUS_COPIED:
4277 fputs(line_prefix, file);
4278 show_rename_copy(file, "copy", p, line_prefix);
4279 break;
4280 case DIFF_STATUS_RENAMED:
4281 fputs(line_prefix, file);
4282 show_rename_copy(file, "rename", p, line_prefix);
4283 break;
4284 default:
4285 if (p->score) {
4286 fprintf(file, "%s rewrite ", line_prefix);
4287 write_name_quoted(p->two->path, file, ' ');
4288 fprintf(file, "(%d%%)\n", similarity_index(p));
4289 }
4290 show_mode_change(file, p, !p->score, line_prefix);
4291 break;
4292 }
4293 }
4294
4295 struct patch_id_t {
4296 git_SHA_CTX *ctx;
4297 int patchlen;
4298 };
4299
4300 static int remove_space(char *line, int len)
4301 {
4302 int i;
4303 char *dst = line;
4304 unsigned char c;
4305
4306 for (i = 0; i < len; i++)
4307 if (!isspace((c = line[i])))
4308 *dst++ = c;
4309
4310 return dst - line;
4311 }
4312
4313 static void patch_id_consume(void *priv, char *line, unsigned long len)
4314 {
4315 struct patch_id_t *data = priv;
4316 int new_len;
4317
4318 /* Ignore line numbers when computing the SHA1 of the patch */
4319 if (starts_with(line, "@@ -"))
4320 return;
4321
4322 new_len = remove_space(line, len);
4323
4324 git_SHA1_Update(data->ctx, line, new_len);
4325 data->patchlen += new_len;
4326 }
4327
4328 /* returns 0 upon success, and writes result into sha1 */
4329 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4330 {
4331 struct diff_queue_struct *q = &diff_queued_diff;
4332 int i;
4333 git_SHA_CTX ctx;
4334 struct patch_id_t data;
4335 char buffer[PATH_MAX * 4 + 20];
4336
4337 git_SHA1_Init(&ctx);
4338 memset(&data, 0, sizeof(struct patch_id_t));
4339 data.ctx = &ctx;
4340
4341 for (i = 0; i < q->nr; i++) {
4342 xpparam_t xpp;
4343 xdemitconf_t xecfg;
4344 mmfile_t mf1, mf2;
4345 struct diff_filepair *p = q->queue[i];
4346 int len1, len2;
4347
4348 memset(&xpp, 0, sizeof(xpp));
4349 memset(&xecfg, 0, sizeof(xecfg));
4350 if (p->status == 0)
4351 return error("internal diff status error");
4352 if (p->status == DIFF_STATUS_UNKNOWN)
4353 continue;
4354 if (diff_unmodified_pair(p))
4355 continue;
4356 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4357 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4358 continue;
4359 if (DIFF_PAIR_UNMERGED(p))
4360 continue;
4361
4362 diff_fill_sha1_info(p->one);
4363 diff_fill_sha1_info(p->two);
4364 if (fill_mmfile(&mf1, p->one) < 0 ||
4365 fill_mmfile(&mf2, p->two) < 0)
4366 return error("unable to read files to diff");
4367
4368 len1 = remove_space(p->one->path, strlen(p->one->path));
4369 len2 = remove_space(p->two->path, strlen(p->two->path));
4370 if (p->one->mode == 0)
4371 len1 = snprintf(buffer, sizeof(buffer),
4372 "diff--gita/%.*sb/%.*s"
4373 "newfilemode%06o"
4374 "---/dev/null"
4375 "+++b/%.*s",
4376 len1, p->one->path,
4377 len2, p->two->path,
4378 p->two->mode,
4379 len2, p->two->path);
4380 else if (p->two->mode == 0)
4381 len1 = snprintf(buffer, sizeof(buffer),
4382 "diff--gita/%.*sb/%.*s"
4383 "deletedfilemode%06o"
4384 "---a/%.*s"
4385 "+++/dev/null",
4386 len1, p->one->path,
4387 len2, p->two->path,
4388 p->one->mode,
4389 len1, p->one->path);
4390 else
4391 len1 = snprintf(buffer, sizeof(buffer),
4392 "diff--gita/%.*sb/%.*s"
4393 "---a/%.*s"
4394 "+++b/%.*s",
4395 len1, p->one->path,
4396 len2, p->two->path,
4397 len1, p->one->path,
4398 len2, p->two->path);
4399 git_SHA1_Update(&ctx, buffer, len1);
4400
4401 if (diff_filespec_is_binary(p->one) ||
4402 diff_filespec_is_binary(p->two)) {
4403 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4404 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4405 continue;
4406 }
4407
4408 xpp.flags = 0;
4409 xecfg.ctxlen = 3;
4410 xecfg.flags = 0;
4411 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4412 &xpp, &xecfg);
4413 }
4414
4415 git_SHA1_Final(sha1, &ctx);
4416 return 0;
4417 }
4418
4419 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4420 {
4421 struct diff_queue_struct *q = &diff_queued_diff;
4422 int i;
4423 int result = diff_get_patch_id(options, sha1);
4424
4425 for (i = 0; i < q->nr; i++)
4426 diff_free_filepair(q->queue[i]);
4427
4428 free(q->queue);
4429 DIFF_QUEUE_CLEAR(q);
4430
4431 return result;
4432 }
4433
4434 static int is_summary_empty(const struct diff_queue_struct *q)
4435 {
4436 int i;
4437
4438 for (i = 0; i < q->nr; i++) {
4439 const struct diff_filepair *p = q->queue[i];
4440
4441 switch (p->status) {
4442 case DIFF_STATUS_DELETED:
4443 case DIFF_STATUS_ADDED:
4444 case DIFF_STATUS_COPIED:
4445 case DIFF_STATUS_RENAMED:
4446 return 0;
4447 default:
4448 if (p->score)
4449 return 0;
4450 if (p->one->mode && p->two->mode &&
4451 p->one->mode != p->two->mode)
4452 return 0;
4453 break;
4454 }
4455 }
4456 return 1;
4457 }
4458
4459 static const char rename_limit_warning[] =
4460 "inexact rename detection was skipped due to too many files.";
4461
4462 static const char degrade_cc_to_c_warning[] =
4463 "only found copies from modified paths due to too many files.";
4464
4465 static const char rename_limit_advice[] =
4466 "you may want to set your %s variable to at least "
4467 "%d and retry the command.";
4468
4469 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4470 {
4471 if (degraded_cc)
4472 warning(degrade_cc_to_c_warning);
4473 else if (needed)
4474 warning(rename_limit_warning);
4475 else
4476 return;
4477 if (0 < needed && needed < 32767)
4478 warning(rename_limit_advice, varname, needed);
4479 }
4480
4481 void diff_flush(struct diff_options *options)
4482 {
4483 struct diff_queue_struct *q = &diff_queued_diff;
4484 int i, output_format = options->output_format;
4485 int separator = 0;
4486 int dirstat_by_line = 0;
4487
4488 /*
4489 * Order: raw, stat, summary, patch
4490 * or: name/name-status/checkdiff (other bits clear)
4491 */
4492 if (!q->nr)
4493 goto free_queue;
4494
4495 if (output_format & (DIFF_FORMAT_RAW |
4496 DIFF_FORMAT_NAME |
4497 DIFF_FORMAT_NAME_STATUS |
4498 DIFF_FORMAT_CHECKDIFF)) {
4499 for (i = 0; i < q->nr; i++) {
4500 struct diff_filepair *p = q->queue[i];
4501 if (check_pair_status(p))
4502 flush_one_pair(p, options);
4503 }
4504 separator++;
4505 }
4506
4507 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4508 dirstat_by_line = 1;
4509
4510 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4511 dirstat_by_line) {
4512 struct diffstat_t diffstat;
4513
4514 memset(&diffstat, 0, sizeof(struct diffstat_t));
4515 for (i = 0; i < q->nr; i++) {
4516 struct diff_filepair *p = q->queue[i];
4517 if (check_pair_status(p))
4518 diff_flush_stat(p, options, &diffstat);
4519 }
4520 if (output_format & DIFF_FORMAT_NUMSTAT)
4521 show_numstat(&diffstat, options);
4522 if (output_format & DIFF_FORMAT_DIFFSTAT)
4523 show_stats(&diffstat, options);
4524 if (output_format & DIFF_FORMAT_SHORTSTAT)
4525 show_shortstats(&diffstat, options);
4526 if (output_format & DIFF_FORMAT_DIRSTAT)
4527 show_dirstat_by_line(&diffstat, options);
4528 free_diffstat_info(&diffstat);
4529 separator++;
4530 }
4531 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4532 show_dirstat(options);
4533
4534 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4535 for (i = 0; i < q->nr; i++) {
4536 diff_summary(options, q->queue[i]);
4537 }
4538 separator++;
4539 }
4540
4541 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4542 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4543 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4544 /*
4545 * run diff_flush_patch for the exit status. setting
4546 * options->file to /dev/null should be safe, because we
4547 * aren't supposed to produce any output anyway.
4548 */
4549 if (options->close_file)
4550 fclose(options->file);
4551 options->file = fopen("/dev/null", "w");
4552 if (!options->file)
4553 die_errno("Could not open /dev/null");
4554 options->close_file = 1;
4555 for (i = 0; i < q->nr; i++) {
4556 struct diff_filepair *p = q->queue[i];
4557 if (check_pair_status(p))
4558 diff_flush_patch(p, options);
4559 if (options->found_changes)
4560 break;
4561 }
4562 }
4563
4564 if (output_format & DIFF_FORMAT_PATCH) {
4565 if (separator) {
4566 fprintf(options->file, "%s%c",
4567 diff_line_prefix(options),
4568 options->line_termination);
4569 if (options->stat_sep) {
4570 /* attach patch instead of inline */
4571 fputs(options->stat_sep, options->file);
4572 }
4573 }
4574
4575 for (i = 0; i < q->nr; i++) {
4576 struct diff_filepair *p = q->queue[i];
4577 if (check_pair_status(p))
4578 diff_flush_patch(p, options);
4579 }
4580 }
4581
4582 if (output_format & DIFF_FORMAT_CALLBACK)
4583 options->format_callback(q, options, options->format_callback_data);
4584
4585 for (i = 0; i < q->nr; i++)
4586 diff_free_filepair(q->queue[i]);
4587 free_queue:
4588 free(q->queue);
4589 DIFF_QUEUE_CLEAR(q);
4590 if (options->close_file)
4591 fclose(options->file);
4592
4593 /*
4594 * Report the content-level differences with HAS_CHANGES;
4595 * diff_addremove/diff_change does not set the bit when
4596 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4597 */
4598 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4599 if (options->found_changes)
4600 DIFF_OPT_SET(options, HAS_CHANGES);
4601 else
4602 DIFF_OPT_CLR(options, HAS_CHANGES);
4603 }
4604 }
4605
4606 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4607 {
4608 return (((p->status == DIFF_STATUS_MODIFIED) &&
4609 ((p->score &&
4610 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4611 (!p->score &&
4612 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4613 ((p->status != DIFF_STATUS_MODIFIED) &&
4614 filter_bit_tst(p->status, options)));
4615 }
4616
4617 static void diffcore_apply_filter(struct diff_options *options)
4618 {
4619 int i;
4620 struct diff_queue_struct *q = &diff_queued_diff;
4621 struct diff_queue_struct outq;
4622
4623 DIFF_QUEUE_CLEAR(&outq);
4624
4625 if (!options->filter)
4626 return;
4627
4628 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4629 int found;
4630 for (i = found = 0; !found && i < q->nr; i++) {
4631 if (match_filter(options, q->queue[i]))
4632 found++;
4633 }
4634 if (found)
4635 return;
4636
4637 /* otherwise we will clear the whole queue
4638 * by copying the empty outq at the end of this
4639 * function, but first clear the current entries
4640 * in the queue.
4641 */
4642 for (i = 0; i < q->nr; i++)
4643 diff_free_filepair(q->queue[i]);
4644 }
4645 else {
4646 /* Only the matching ones */
4647 for (i = 0; i < q->nr; i++) {
4648 struct diff_filepair *p = q->queue[i];
4649 if (match_filter(options, p))
4650 diff_q(&outq, p);
4651 else
4652 diff_free_filepair(p);
4653 }
4654 }
4655 free(q->queue);
4656 *q = outq;
4657 }
4658
4659 /* Check whether two filespecs with the same mode and size are identical */
4660 static int diff_filespec_is_identical(struct diff_filespec *one,
4661 struct diff_filespec *two)
4662 {
4663 if (S_ISGITLINK(one->mode))
4664 return 0;
4665 if (diff_populate_filespec(one, 0))
4666 return 0;
4667 if (diff_populate_filespec(two, 0))
4668 return 0;
4669 return !memcmp(one->data, two->data, one->size);
4670 }
4671
4672 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4673 {
4674 if (p->done_skip_stat_unmatch)
4675 return p->skip_stat_unmatch_result;
4676
4677 p->done_skip_stat_unmatch = 1;
4678 p->skip_stat_unmatch_result = 0;
4679 /*
4680 * 1. Entries that come from stat info dirtiness
4681 * always have both sides (iow, not create/delete),
4682 * one side of the object name is unknown, with
4683 * the same mode and size. Keep the ones that
4684 * do not match these criteria. They have real
4685 * differences.
4686 *
4687 * 2. At this point, the file is known to be modified,
4688 * with the same mode and size, and the object
4689 * name of one side is unknown. Need to inspect
4690 * the identical contents.
4691 */
4692 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4693 !DIFF_FILE_VALID(p->two) ||
4694 (p->one->sha1_valid && p->two->sha1_valid) ||
4695 (p->one->mode != p->two->mode) ||
4696 diff_populate_filespec(p->one, 1) ||
4697 diff_populate_filespec(p->two, 1) ||
4698 (p->one->size != p->two->size) ||
4699 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4700 p->skip_stat_unmatch_result = 1;
4701 return p->skip_stat_unmatch_result;
4702 }
4703
4704 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4705 {
4706 int i;
4707 struct diff_queue_struct *q = &diff_queued_diff;
4708 struct diff_queue_struct outq;
4709 DIFF_QUEUE_CLEAR(&outq);
4710
4711 for (i = 0; i < q->nr; i++) {
4712 struct diff_filepair *p = q->queue[i];
4713
4714 if (diff_filespec_check_stat_unmatch(p))
4715 diff_q(&outq, p);
4716 else {
4717 /*
4718 * The caller can subtract 1 from skip_stat_unmatch
4719 * to determine how many paths were dirty only
4720 * due to stat info mismatch.
4721 */
4722 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4723 diffopt->skip_stat_unmatch++;
4724 diff_free_filepair(p);
4725 }
4726 }
4727 free(q->queue);
4728 *q = outq;
4729 }
4730
4731 static int diffnamecmp(const void *a_, const void *b_)
4732 {
4733 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4734 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4735 const char *name_a, *name_b;
4736
4737 name_a = a->one ? a->one->path : a->two->path;
4738 name_b = b->one ? b->one->path : b->two->path;
4739 return strcmp(name_a, name_b);
4740 }
4741
4742 void diffcore_fix_diff_index(struct diff_options *options)
4743 {
4744 struct diff_queue_struct *q = &diff_queued_diff;
4745 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4746 }
4747
4748 void diffcore_std(struct diff_options *options)
4749 {
4750 /* NOTE please keep the following in sync with diff_tree_combined() */
4751 if (options->skip_stat_unmatch)
4752 diffcore_skip_stat_unmatch(options);
4753 if (!options->found_follow) {
4754 /* See try_to_follow_renames() in tree-diff.c */
4755 if (options->break_opt != -1)
4756 diffcore_break(options->break_opt);
4757 if (options->detect_rename)
4758 diffcore_rename(options);
4759 if (options->break_opt != -1)
4760 diffcore_merge_broken();
4761 }
4762 if (options->pickaxe)
4763 diffcore_pickaxe(options);
4764 if (options->orderfile)
4765 diffcore_order(options->orderfile);
4766 if (!options->found_follow)
4767 /* See try_to_follow_renames() in tree-diff.c */
4768 diff_resolve_rename_copy();
4769 diffcore_apply_filter(options);
4770
4771 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4772 DIFF_OPT_SET(options, HAS_CHANGES);
4773 else
4774 DIFF_OPT_CLR(options, HAS_CHANGES);
4775
4776 options->found_follow = 0;
4777 }
4778
4779 int diff_result_code(struct diff_options *opt, int status)
4780 {
4781 int result = 0;
4782
4783 diff_warn_rename_limit("diff.renameLimit",
4784 opt->needed_rename_limit,
4785 opt->degraded_cc_to_c);
4786 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4787 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4788 return status;
4789 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4790 DIFF_OPT_TST(opt, HAS_CHANGES))
4791 result |= 01;
4792 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4793 DIFF_OPT_TST(opt, CHECK_FAILED))
4794 result |= 02;
4795 return result;
4796 }
4797
4798 int diff_can_quit_early(struct diff_options *opt)
4799 {
4800 return (DIFF_OPT_TST(opt, QUICK) &&
4801 !opt->filter &&
4802 DIFF_OPT_TST(opt, HAS_CHANGES));
4803 }
4804
4805 /*
4806 * Shall changes to this submodule be ignored?
4807 *
4808 * Submodule changes can be configured to be ignored separately for each path,
4809 * but that configuration can be overridden from the command line.
4810 */
4811 static int is_submodule_ignored(const char *path, struct diff_options *options)
4812 {
4813 int ignored = 0;
4814 unsigned orig_flags = options->flags;
4815 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4816 set_diffopt_flags_from_submodule_config(options, path);
4817 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4818 ignored = 1;
4819 options->flags = orig_flags;
4820 return ignored;
4821 }
4822
4823 void diff_addremove(struct diff_options *options,
4824 int addremove, unsigned mode,
4825 const unsigned char *sha1,
4826 int sha1_valid,
4827 const char *concatpath, unsigned dirty_submodule)
4828 {
4829 struct diff_filespec *one, *two;
4830
4831 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4832 return;
4833
4834 /* This may look odd, but it is a preparation for
4835 * feeding "there are unchanged files which should
4836 * not produce diffs, but when you are doing copy
4837 * detection you would need them, so here they are"
4838 * entries to the diff-core. They will be prefixed
4839 * with something like '=' or '*' (I haven't decided
4840 * which but should not make any difference).
4841 * Feeding the same new and old to diff_change()
4842 * also has the same effect.
4843 * Before the final output happens, they are pruned after
4844 * merged into rename/copy pairs as appropriate.
4845 */
4846 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4847 addremove = (addremove == '+' ? '-' :
4848 addremove == '-' ? '+' : addremove);
4849
4850 if (options->prefix &&
4851 strncmp(concatpath, options->prefix, options->prefix_length))
4852 return;
4853
4854 one = alloc_filespec(concatpath);
4855 two = alloc_filespec(concatpath);
4856
4857 if (addremove != '+')
4858 fill_filespec(one, sha1, sha1_valid, mode);
4859 if (addremove != '-') {
4860 fill_filespec(two, sha1, sha1_valid, mode);
4861 two->dirty_submodule = dirty_submodule;
4862 }
4863
4864 diff_queue(&diff_queued_diff, one, two);
4865 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4866 DIFF_OPT_SET(options, HAS_CHANGES);
4867 }
4868
4869 void diff_change(struct diff_options *options,
4870 unsigned old_mode, unsigned new_mode,
4871 const unsigned char *old_sha1,
4872 const unsigned char *new_sha1,
4873 int old_sha1_valid, int new_sha1_valid,
4874 const char *concatpath,
4875 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4876 {
4877 struct diff_filespec *one, *two;
4878 struct diff_filepair *p;
4879
4880 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4881 is_submodule_ignored(concatpath, options))
4882 return;
4883
4884 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4885 unsigned tmp;
4886 const unsigned char *tmp_c;
4887 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4888 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4889 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4890 new_sha1_valid = tmp;
4891 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4892 new_dirty_submodule = tmp;
4893 }
4894
4895 if (options->prefix &&
4896 strncmp(concatpath, options->prefix, options->prefix_length))
4897 return;
4898
4899 one = alloc_filespec(concatpath);
4900 two = alloc_filespec(concatpath);
4901 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4902 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4903 one->dirty_submodule = old_dirty_submodule;
4904 two->dirty_submodule = new_dirty_submodule;
4905 p = diff_queue(&diff_queued_diff, one, two);
4906
4907 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4908 return;
4909
4910 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
4911 !diff_filespec_check_stat_unmatch(p))
4912 return;
4913
4914 DIFF_OPT_SET(options, HAS_CHANGES);
4915 }
4916
4917 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4918 {
4919 struct diff_filepair *pair;
4920 struct diff_filespec *one, *two;
4921
4922 if (options->prefix &&
4923 strncmp(path, options->prefix, options->prefix_length))
4924 return NULL;
4925
4926 one = alloc_filespec(path);
4927 two = alloc_filespec(path);
4928 pair = diff_queue(&diff_queued_diff, one, two);
4929 pair->is_unmerged = 1;
4930 return pair;
4931 }
4932
4933 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4934 size_t *outsize)
4935 {
4936 struct diff_tempfile *temp;
4937 const char *argv[3];
4938 const char **arg = argv;
4939 struct child_process child;
4940 struct strbuf buf = STRBUF_INIT;
4941 int err = 0;
4942
4943 temp = prepare_temp_file(spec->path, spec);
4944 *arg++ = pgm;
4945 *arg++ = temp->name;
4946 *arg = NULL;
4947
4948 memset(&child, 0, sizeof(child));
4949 child.use_shell = 1;
4950 child.argv = argv;
4951 child.out = -1;
4952 if (start_command(&child)) {
4953 remove_tempfile();
4954 return NULL;
4955 }
4956
4957 if (strbuf_read(&buf, child.out, 0) < 0)
4958 err = error("error reading from textconv command '%s'", pgm);
4959 close(child.out);
4960
4961 if (finish_command(&child) || err) {
4962 strbuf_release(&buf);
4963 remove_tempfile();
4964 return NULL;
4965 }
4966 remove_tempfile();
4967
4968 return strbuf_detach(&buf, outsize);
4969 }
4970
4971 size_t fill_textconv(struct userdiff_driver *driver,
4972 struct diff_filespec *df,
4973 char **outbuf)
4974 {
4975 size_t size;
4976
4977 if (!driver || !driver->textconv) {
4978 if (!DIFF_FILE_VALID(df)) {
4979 *outbuf = "";
4980 return 0;
4981 }
4982 if (diff_populate_filespec(df, 0))
4983 die("unable to read files to diff");
4984 *outbuf = df->data;
4985 return df->size;
4986 }
4987
4988 if (driver->textconv_cache && df->sha1_valid) {
4989 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4990 &size);
4991 if (*outbuf)
4992 return size;
4993 }
4994
4995 *outbuf = run_textconv(driver->textconv, df, &size);
4996 if (!*outbuf)
4997 die("unable to read files to diff");
4998
4999 if (driver->textconv_cache && df->sha1_valid) {
5000 /* ignore errors, as we might be in a readonly repository */
5001 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
5002 size);
5003 /*
5004 * we could save up changes and flush them all at the end,
5005 * but we would need an extra call after all diffing is done.
5006 * Since generating a cache entry is the slow path anyway,
5007 * this extra overhead probably isn't a big deal.
5008 */
5009 notes_cache_write(driver->textconv_cache);
5010 }
5011
5012 return size;
5013 }
5014
5015 void setup_diff_pager(struct diff_options *opt)
5016 {
5017 /*
5018 * If the user asked for our exit code, then either they want --quiet
5019 * or --exit-code. We should definitely not bother with a pager in the
5020 * former case, as we will generate no output. Since we still properly
5021 * report our exit code even when a pager is run, we _could_ run a
5022 * pager with --exit-code. But since we have not done so historically,
5023 * and because it is easy to find people oneline advising "git diff
5024 * --exit-code" in hooks and other scripts, we do not do so.
5025 */
5026 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5027 check_pager_config("diff") != 0)
5028 setup_pager();
5029 }
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