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[git.git] / diff.c
blob867f034b8ffc052d28f28a86fd9f52a5aa5b2c82
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)
56 {
57 if (!strcasecmp(var, "plain"))
58 return DIFF_PLAIN;
59 if (!strcasecmp(var, "meta"))
60 return DIFF_METAINFO;
61 if (!strcasecmp(var, "frag"))
62 return DIFF_FRAGINFO;
63 if (!strcasecmp(var, "old"))
64 return DIFF_FILE_OLD;
65 if (!strcasecmp(var, "new"))
66 return DIFF_FILE_NEW;
67 if (!strcasecmp(var, "commit"))
68 return DIFF_COMMIT;
69 if (!strcasecmp(var, "whitespace"))
70 return DIFF_WHITESPACE;
71 if (!strcasecmp(var, "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 const char *name;
235
236 if (!strcmp(var, "diff.renamelimit")) {
237 diff_rename_limit_default = git_config_int(var, value);
238 return 0;
239 }
240
241 if (userdiff_config(var, value) < 0)
242 return -1;
243
244 if (skip_prefix(var, "diff.color.", &name) ||
245 skip_prefix(var, "color.diff.", &name)) {
246 int slot = parse_diff_color_slot(name);
247 if (slot < 0)
248 return 0;
249 if (!value)
250 return config_error_nonbool(var);
251 color_parse(value, var, diff_colors[slot]);
252 return 0;
253 }
254
255 /* like GNU diff's --suppress-blank-empty option */
256 if (!strcmp(var, "diff.suppressblankempty") ||
257 /* for backwards compatibility */
258 !strcmp(var, "diff.suppress-blank-empty")) {
259 diff_suppress_blank_empty = git_config_bool(var, value);
260 return 0;
261 }
262
263 if (!strcmp(var, "diff.dirstat")) {
264 struct strbuf errmsg = STRBUF_INIT;
265 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
266 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
267 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
268 errmsg.buf);
269 strbuf_release(&errmsg);
270 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
271 return 0;
272 }
273
274 if (starts_with(var, "submodule."))
275 return parse_submodule_config_option(var, value);
276
277 return git_default_config(var, value, cb);
278 }
279
280 static char *quote_two(const char *one, const char *two)
281 {
282 int need_one = quote_c_style(one, NULL, NULL, 1);
283 int need_two = quote_c_style(two, NULL, NULL, 1);
284 struct strbuf res = STRBUF_INIT;
285
286 if (need_one + need_two) {
287 strbuf_addch(&res, '"');
288 quote_c_style(one, &res, NULL, 1);
289 quote_c_style(two, &res, NULL, 1);
290 strbuf_addch(&res, '"');
291 } else {
292 strbuf_addstr(&res, one);
293 strbuf_addstr(&res, two);
294 }
295 return strbuf_detach(&res, NULL);
296 }
297
298 static const char *external_diff(void)
299 {
300 static const char *external_diff_cmd = NULL;
301 static int done_preparing = 0;
302
303 if (done_preparing)
304 return external_diff_cmd;
305 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
306 if (!external_diff_cmd)
307 external_diff_cmd = external_diff_cmd_cfg;
308 done_preparing = 1;
309 return external_diff_cmd;
310 }
311
312 static struct diff_tempfile {
313 const char *name; /* filename external diff should read from */
314 char hex[41];
315 char mode[10];
316 char tmp_path[PATH_MAX];
317 } diff_temp[2];
318
319 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
320
321 struct emit_callback {
322 int color_diff;
323 unsigned ws_rule;
324 int blank_at_eof_in_preimage;
325 int blank_at_eof_in_postimage;
326 int lno_in_preimage;
327 int lno_in_postimage;
328 sane_truncate_fn truncate;
329 const char **label_path;
330 struct diff_words_data *diff_words;
331 struct diff_options *opt;
332 int *found_changesp;
333 struct strbuf *header;
334 };
335
336 static int count_lines(const char *data, int size)
337 {
338 int count, ch, completely_empty = 1, nl_just_seen = 0;
339 count = 0;
340 while (0 < size--) {
341 ch = *data++;
342 if (ch == '\n') {
343 count++;
344 nl_just_seen = 1;
345 completely_empty = 0;
346 }
347 else {
348 nl_just_seen = 0;
349 completely_empty = 0;
350 }
351 }
352 if (completely_empty)
353 return 0;
354 if (!nl_just_seen)
355 count++; /* no trailing newline */
356 return count;
357 }
358
359 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
360 {
361 if (!DIFF_FILE_VALID(one)) {
362 mf->ptr = (char *)""; /* does not matter */
363 mf->size = 0;
364 return 0;
365 }
366 else if (diff_populate_filespec(one, 0))
367 return -1;
368
369 mf->ptr = one->data;
370 mf->size = one->size;
371 return 0;
372 }
373
374 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
375 static unsigned long diff_filespec_size(struct diff_filespec *one)
376 {
377 if (!DIFF_FILE_VALID(one))
378 return 0;
379 diff_populate_filespec(one, 1);
380 return one->size;
381 }
382
383 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
384 {
385 char *ptr = mf->ptr;
386 long size = mf->size;
387 int cnt = 0;
388
389 if (!size)
390 return cnt;
391 ptr += size - 1; /* pointing at the very end */
392 if (*ptr != '\n')
393 ; /* incomplete line */
394 else
395 ptr--; /* skip the last LF */
396 while (mf->ptr < ptr) {
397 char *prev_eol;
398 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
399 if (*prev_eol == '\n')
400 break;
401 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
402 break;
403 cnt++;
404 ptr = prev_eol - 1;
405 }
406 return cnt;
407 }
408
409 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
410 struct emit_callback *ecbdata)
411 {
412 int l1, l2, at;
413 unsigned ws_rule = ecbdata->ws_rule;
414 l1 = count_trailing_blank(mf1, ws_rule);
415 l2 = count_trailing_blank(mf2, ws_rule);
416 if (l2 <= l1) {
417 ecbdata->blank_at_eof_in_preimage = 0;
418 ecbdata->blank_at_eof_in_postimage = 0;
419 return;
420 }
421 at = count_lines(mf1->ptr, mf1->size);
422 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
423
424 at = count_lines(mf2->ptr, mf2->size);
425 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
426 }
427
428 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
429 int first, const char *line, int len)
430 {
431 int has_trailing_newline, has_trailing_carriage_return;
432 int nofirst;
433 FILE *file = o->file;
434
435 fputs(diff_line_prefix(o), file);
436
437 if (len == 0) {
438 has_trailing_newline = (first == '\n');
439 has_trailing_carriage_return = (!has_trailing_newline &&
440 (first == '\r'));
441 nofirst = has_trailing_newline || has_trailing_carriage_return;
442 } else {
443 has_trailing_newline = (len > 0 && line[len-1] == '\n');
444 if (has_trailing_newline)
445 len--;
446 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
447 if (has_trailing_carriage_return)
448 len--;
449 nofirst = 0;
450 }
451
452 if (len || !nofirst) {
453 fputs(set, file);
454 if (!nofirst)
455 fputc(first, file);
456 fwrite(line, len, 1, file);
457 fputs(reset, file);
458 }
459 if (has_trailing_carriage_return)
460 fputc('\r', file);
461 if (has_trailing_newline)
462 fputc('\n', file);
463 }
464
465 static void emit_line(struct diff_options *o, const char *set, const char *reset,
466 const char *line, int len)
467 {
468 emit_line_0(o, set, reset, line[0], line+1, len-1);
469 }
470
471 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
472 {
473 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
474 ecbdata->blank_at_eof_in_preimage &&
475 ecbdata->blank_at_eof_in_postimage &&
476 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
477 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
478 return 0;
479 return ws_blank_line(line, len, ecbdata->ws_rule);
480 }
481
482 static void emit_add_line(const char *reset,
483 struct emit_callback *ecbdata,
484 const char *line, int len)
485 {
486 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
487 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
488
489 if (!*ws)
490 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
491 else if (new_blank_line_at_eof(ecbdata, line, len))
492 /* Blank line at EOF - paint '+' as well */
493 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
494 else {
495 /* Emit just the prefix, then the rest. */
496 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
497 ws_check_emit(line, len, ecbdata->ws_rule,
498 ecbdata->opt->file, set, reset, ws);
499 }
500 }
501
502 static void emit_hunk_header(struct emit_callback *ecbdata,
503 const char *line, int len)
504 {
505 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
506 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
507 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
508 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
509 static const char atat[2] = { '@', '@' };
510 const char *cp, *ep;
511 struct strbuf msgbuf = STRBUF_INIT;
512 int org_len = len;
513 int i = 1;
514
515 /*
516 * As a hunk header must begin with "@@ -<old>, +<new> @@",
517 * it always is at least 10 bytes long.
518 */
519 if (len < 10 ||
520 memcmp(line, atat, 2) ||
521 !(ep = memmem(line + 2, len - 2, atat, 2))) {
522 emit_line(ecbdata->opt, plain, reset, line, len);
523 return;
524 }
525 ep += 2; /* skip over @@ */
526
527 /* The hunk header in fraginfo color */
528 strbuf_addstr(&msgbuf, frag);
529 strbuf_add(&msgbuf, line, ep - line);
530 strbuf_addstr(&msgbuf, reset);
531
532 /*
533 * trailing "\r\n"
534 */
535 for ( ; i < 3; i++)
536 if (line[len - i] == '\r' || line[len - i] == '\n')
537 len--;
538
539 /* blank before the func header */
540 for (cp = ep; ep - line < len; ep++)
541 if (*ep != ' ' && *ep != '\t')
542 break;
543 if (ep != cp) {
544 strbuf_addstr(&msgbuf, plain);
545 strbuf_add(&msgbuf, cp, ep - cp);
546 strbuf_addstr(&msgbuf, reset);
547 }
548
549 if (ep < line + len) {
550 strbuf_addstr(&msgbuf, func);
551 strbuf_add(&msgbuf, ep, line + len - ep);
552 strbuf_addstr(&msgbuf, reset);
553 }
554
555 strbuf_add(&msgbuf, line + len, org_len - len);
556 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
557 strbuf_release(&msgbuf);
558 }
559
560 static struct diff_tempfile *claim_diff_tempfile(void) {
561 int i;
562 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
563 if (!diff_temp[i].name)
564 return diff_temp + i;
565 die("BUG: diff is failing to clean up its tempfiles");
566 }
567
568 static int remove_tempfile_installed;
569
570 static void remove_tempfile(void)
571 {
572 int i;
573 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
574 if (diff_temp[i].name == diff_temp[i].tmp_path)
575 unlink_or_warn(diff_temp[i].name);
576 diff_temp[i].name = NULL;
577 }
578 }
579
580 static void remove_tempfile_on_signal(int signo)
581 {
582 remove_tempfile();
583 sigchain_pop(signo);
584 raise(signo);
585 }
586
587 static void print_line_count(FILE *file, int count)
588 {
589 switch (count) {
590 case 0:
591 fprintf(file, "0,0");
592 break;
593 case 1:
594 fprintf(file, "1");
595 break;
596 default:
597 fprintf(file, "1,%d", count);
598 break;
599 }
600 }
601
602 static void emit_rewrite_lines(struct emit_callback *ecb,
603 int prefix, const char *data, int size)
604 {
605 const char *endp = NULL;
606 static const char *nneof = " No newline at end of file\n";
607 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
608 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
609
610 while (0 < size) {
611 int len;
612
613 endp = memchr(data, '\n', size);
614 len = endp ? (endp - data + 1) : size;
615 if (prefix != '+') {
616 ecb->lno_in_preimage++;
617 emit_line_0(ecb->opt, old, reset, '-',
618 data, len);
619 } else {
620 ecb->lno_in_postimage++;
621 emit_add_line(reset, ecb, data, len);
622 }
623 size -= len;
624 data += len;
625 }
626 if (!endp) {
627 const char *plain = diff_get_color(ecb->color_diff,
628 DIFF_PLAIN);
629 putc('\n', ecb->opt->file);
630 emit_line_0(ecb->opt, plain, reset, '\\',
631 nneof, strlen(nneof));
632 }
633 }
634
635 static void emit_rewrite_diff(const char *name_a,
636 const char *name_b,
637 struct diff_filespec *one,
638 struct diff_filespec *two,
639 struct userdiff_driver *textconv_one,
640 struct userdiff_driver *textconv_two,
641 struct diff_options *o)
642 {
643 int lc_a, lc_b;
644 const char *name_a_tab, *name_b_tab;
645 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
646 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
647 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
648 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
649 const char *a_prefix, *b_prefix;
650 char *data_one, *data_two;
651 size_t size_one, size_two;
652 struct emit_callback ecbdata;
653 const char *line_prefix = diff_line_prefix(o);
654
655 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
656 a_prefix = o->b_prefix;
657 b_prefix = o->a_prefix;
658 } else {
659 a_prefix = o->a_prefix;
660 b_prefix = o->b_prefix;
661 }
662
663 name_a += (*name_a == '/');
664 name_b += (*name_b == '/');
665 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
666 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
667
668 strbuf_reset(&a_name);
669 strbuf_reset(&b_name);
670 quote_two_c_style(&a_name, a_prefix, name_a, 0);
671 quote_two_c_style(&b_name, b_prefix, name_b, 0);
672
673 size_one = fill_textconv(textconv_one, one, &data_one);
674 size_two = fill_textconv(textconv_two, two, &data_two);
675
676 memset(&ecbdata, 0, sizeof(ecbdata));
677 ecbdata.color_diff = want_color(o->use_color);
678 ecbdata.found_changesp = &o->found_changes;
679 ecbdata.ws_rule = whitespace_rule(name_b);
680 ecbdata.opt = o;
681 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
682 mmfile_t mf1, mf2;
683 mf1.ptr = (char *)data_one;
684 mf2.ptr = (char *)data_two;
685 mf1.size = size_one;
686 mf2.size = size_two;
687 check_blank_at_eof(&mf1, &mf2, &ecbdata);
688 }
689 ecbdata.lno_in_preimage = 1;
690 ecbdata.lno_in_postimage = 1;
691
692 lc_a = count_lines(data_one, size_one);
693 lc_b = count_lines(data_two, size_two);
694 fprintf(o->file,
695 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
696 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
697 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
698 line_prefix, fraginfo);
699 if (!o->irreversible_delete)
700 print_line_count(o->file, lc_a);
701 else
702 fprintf(o->file, "?,?");
703 fprintf(o->file, " +");
704 print_line_count(o->file, lc_b);
705 fprintf(o->file, " @@%s\n", reset);
706 if (lc_a && !o->irreversible_delete)
707 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
708 if (lc_b)
709 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
710 if (textconv_one)
711 free((char *)data_one);
712 if (textconv_two)
713 free((char *)data_two);
714 }
715
716 struct diff_words_buffer {
717 mmfile_t text;
718 long alloc;
719 struct diff_words_orig {
720 const char *begin, *end;
721 } *orig;
722 int orig_nr, orig_alloc;
723 };
724
725 static void diff_words_append(char *line, unsigned long len,
726 struct diff_words_buffer *buffer)
727 {
728 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
729 line++;
730 len--;
731 memcpy(buffer->text.ptr + buffer->text.size, line, len);
732 buffer->text.size += len;
733 buffer->text.ptr[buffer->text.size] = '\0';
734 }
735
736 struct diff_words_style_elem {
737 const char *prefix;
738 const char *suffix;
739 const char *color; /* NULL; filled in by the setup code if
740 * color is enabled */
741 };
742
743 struct diff_words_style {
744 enum diff_words_type type;
745 struct diff_words_style_elem new, old, ctx;
746 const char *newline;
747 };
748
749 static struct diff_words_style diff_words_styles[] = {
750 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
751 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
752 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
753 };
754
755 struct diff_words_data {
756 struct diff_words_buffer minus, plus;
757 const char *current_plus;
758 int last_minus;
759 struct diff_options *opt;
760 regex_t *word_regex;
761 enum diff_words_type type;
762 struct diff_words_style *style;
763 };
764
765 static int fn_out_diff_words_write_helper(FILE *fp,
766 struct diff_words_style_elem *st_el,
767 const char *newline,
768 size_t count, const char *buf,
769 const char *line_prefix)
770 {
771 int print = 0;
772
773 while (count) {
774 char *p = memchr(buf, '\n', count);
775 if (print)
776 fputs(line_prefix, fp);
777 if (p != buf) {
778 if (st_el->color && fputs(st_el->color, fp) < 0)
779 return -1;
780 if (fputs(st_el->prefix, fp) < 0 ||
781 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
782 fputs(st_el->suffix, fp) < 0)
783 return -1;
784 if (st_el->color && *st_el->color
785 && fputs(GIT_COLOR_RESET, fp) < 0)
786 return -1;
787 }
788 if (!p)
789 return 0;
790 if (fputs(newline, fp) < 0)
791 return -1;
792 count -= p + 1 - buf;
793 buf = p + 1;
794 print = 1;
795 }
796 return 0;
797 }
798
799 /*
800 * '--color-words' algorithm can be described as:
801 *
802 * 1. collect a the minus/plus lines of a diff hunk, divided into
803 * minus-lines and plus-lines;
804 *
805 * 2. break both minus-lines and plus-lines into words and
806 * place them into two mmfile_t with one word for each line;
807 *
808 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
809 *
810 * And for the common parts of the both file, we output the plus side text.
811 * diff_words->current_plus is used to trace the current position of the plus file
812 * which printed. diff_words->last_minus is used to trace the last minus word
813 * printed.
814 *
815 * For '--graph' to work with '--color-words', we need to output the graph prefix
816 * on each line of color words output. Generally, there are two conditions on
817 * which we should output the prefix.
818 *
819 * 1. diff_words->last_minus == 0 &&
820 * diff_words->current_plus == diff_words->plus.text.ptr
821 *
822 * that is: the plus text must start as a new line, and if there is no minus
823 * word printed, a graph prefix must be printed.
824 *
825 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
826 * *(diff_words->current_plus - 1) == '\n'
827 *
828 * that is: a graph prefix must be printed following a '\n'
829 */
830 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
831 {
832 if ((diff_words->last_minus == 0 &&
833 diff_words->current_plus == diff_words->plus.text.ptr) ||
834 (diff_words->current_plus > diff_words->plus.text.ptr &&
835 *(diff_words->current_plus - 1) == '\n')) {
836 return 1;
837 } else {
838 return 0;
839 }
840 }
841
842 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
843 {
844 struct diff_words_data *diff_words = priv;
845 struct diff_words_style *style = diff_words->style;
846 int minus_first, minus_len, plus_first, plus_len;
847 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
848 struct diff_options *opt = diff_words->opt;
849 const char *line_prefix;
850
851 if (line[0] != '@' || parse_hunk_header(line, len,
852 &minus_first, &minus_len, &plus_first, &plus_len))
853 return;
854
855 assert(opt);
856 line_prefix = diff_line_prefix(opt);
857
858 /* POSIX requires that first be decremented by one if len == 0... */
859 if (minus_len) {
860 minus_begin = diff_words->minus.orig[minus_first].begin;
861 minus_end =
862 diff_words->minus.orig[minus_first + minus_len - 1].end;
863 } else
864 minus_begin = minus_end =
865 diff_words->minus.orig[minus_first].end;
866
867 if (plus_len) {
868 plus_begin = diff_words->plus.orig[plus_first].begin;
869 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
870 } else
871 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
872
873 if (color_words_output_graph_prefix(diff_words)) {
874 fputs(line_prefix, diff_words->opt->file);
875 }
876 if (diff_words->current_plus != plus_begin) {
877 fn_out_diff_words_write_helper(diff_words->opt->file,
878 &style->ctx, style->newline,
879 plus_begin - diff_words->current_plus,
880 diff_words->current_plus, line_prefix);
881 if (*(plus_begin - 1) == '\n')
882 fputs(line_prefix, diff_words->opt->file);
883 }
884 if (minus_begin != minus_end) {
885 fn_out_diff_words_write_helper(diff_words->opt->file,
886 &style->old, style->newline,
887 minus_end - minus_begin, minus_begin,
888 line_prefix);
889 }
890 if (plus_begin != plus_end) {
891 fn_out_diff_words_write_helper(diff_words->opt->file,
892 &style->new, style->newline,
893 plus_end - plus_begin, plus_begin,
894 line_prefix);
895 }
896
897 diff_words->current_plus = plus_end;
898 diff_words->last_minus = minus_first;
899 }
900
901 /* This function starts looking at *begin, and returns 0 iff a word was found. */
902 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
903 int *begin, int *end)
904 {
905 if (word_regex && *begin < buffer->size) {
906 regmatch_t match[1];
907 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
908 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
909 '\n', match[0].rm_eo - match[0].rm_so);
910 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
911 *begin += match[0].rm_so;
912 return *begin >= *end;
913 }
914 return -1;
915 }
916
917 /* find the next word */
918 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
919 (*begin)++;
920 if (*begin >= buffer->size)
921 return -1;
922
923 /* find the end of the word */
924 *end = *begin + 1;
925 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
926 (*end)++;
927
928 return 0;
929 }
930
931 /*
932 * This function splits the words in buffer->text, stores the list with
933 * newline separator into out, and saves the offsets of the original words
934 * in buffer->orig.
935 */
936 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
937 regex_t *word_regex)
938 {
939 int i, j;
940 long alloc = 0;
941
942 out->size = 0;
943 out->ptr = NULL;
944
945 /* fake an empty "0th" word */
946 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
947 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
948 buffer->orig_nr = 1;
949
950 for (i = 0; i < buffer->text.size; i++) {
951 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
952 return;
953
954 /* store original boundaries */
955 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
956 buffer->orig_alloc);
957 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
958 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
959 buffer->orig_nr++;
960
961 /* store one word */
962 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
963 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
964 out->ptr[out->size + j - i] = '\n';
965 out->size += j - i + 1;
966
967 i = j - 1;
968 }
969 }
970
971 /* this executes the word diff on the accumulated buffers */
972 static void diff_words_show(struct diff_words_data *diff_words)
973 {
974 xpparam_t xpp;
975 xdemitconf_t xecfg;
976 mmfile_t minus, plus;
977 struct diff_words_style *style = diff_words->style;
978
979 struct diff_options *opt = diff_words->opt;
980 const char *line_prefix;
981
982 assert(opt);
983 line_prefix = diff_line_prefix(opt);
984
985 /* special case: only removal */
986 if (!diff_words->plus.text.size) {
987 fputs(line_prefix, diff_words->opt->file);
988 fn_out_diff_words_write_helper(diff_words->opt->file,
989 &style->old, style->newline,
990 diff_words->minus.text.size,
991 diff_words->minus.text.ptr, line_prefix);
992 diff_words->minus.text.size = 0;
993 return;
994 }
995
996 diff_words->current_plus = diff_words->plus.text.ptr;
997 diff_words->last_minus = 0;
998
999 memset(&xpp, 0, sizeof(xpp));
1000 memset(&xecfg, 0, sizeof(xecfg));
1001 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
1002 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1003 xpp.flags = 0;
1004 /* as only the hunk header will be parsed, we need a 0-context */
1005 xecfg.ctxlen = 0;
1006 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1007 &xpp, &xecfg);
1008 free(minus.ptr);
1009 free(plus.ptr);
1010 if (diff_words->current_plus != diff_words->plus.text.ptr +
1011 diff_words->plus.text.size) {
1012 if (color_words_output_graph_prefix(diff_words))
1013 fputs(line_prefix, diff_words->opt->file);
1014 fn_out_diff_words_write_helper(diff_words->opt->file,
1015 &style->ctx, style->newline,
1016 diff_words->plus.text.ptr + diff_words->plus.text.size
1017 - diff_words->current_plus, diff_words->current_plus,
1018 line_prefix);
1019 }
1020 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1021 }
1022
1023 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1024 static void diff_words_flush(struct emit_callback *ecbdata)
1025 {
1026 if (ecbdata->diff_words->minus.text.size ||
1027 ecbdata->diff_words->plus.text.size)
1028 diff_words_show(ecbdata->diff_words);
1029 }
1030
1031 static void diff_filespec_load_driver(struct diff_filespec *one)
1032 {
1033 /* Use already-loaded driver */
1034 if (one->driver)
1035 return;
1036
1037 if (S_ISREG(one->mode))
1038 one->driver = userdiff_find_by_path(one->path);
1039
1040 /* Fallback to default settings */
1041 if (!one->driver)
1042 one->driver = userdiff_find_by_name("default");
1043 }
1044
1045 static const char *userdiff_word_regex(struct diff_filespec *one)
1046 {
1047 diff_filespec_load_driver(one);
1048 return one->driver->word_regex;
1049 }
1050
1051 static void init_diff_words_data(struct emit_callback *ecbdata,
1052 struct diff_options *orig_opts,
1053 struct diff_filespec *one,
1054 struct diff_filespec *two)
1055 {
1056 int i;
1057 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1058 memcpy(o, orig_opts, sizeof(struct diff_options));
1059
1060 ecbdata->diff_words =
1061 xcalloc(1, sizeof(struct diff_words_data));
1062 ecbdata->diff_words->type = o->word_diff;
1063 ecbdata->diff_words->opt = o;
1064 if (!o->word_regex)
1065 o->word_regex = userdiff_word_regex(one);
1066 if (!o->word_regex)
1067 o->word_regex = userdiff_word_regex(two);
1068 if (!o->word_regex)
1069 o->word_regex = diff_word_regex_cfg;
1070 if (o->word_regex) {
1071 ecbdata->diff_words->word_regex = (regex_t *)
1072 xmalloc(sizeof(regex_t));
1073 if (regcomp(ecbdata->diff_words->word_regex,
1074 o->word_regex,
1075 REG_EXTENDED | REG_NEWLINE))
1076 die ("Invalid regular expression: %s",
1077 o->word_regex);
1078 }
1079 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1080 if (o->word_diff == diff_words_styles[i].type) {
1081 ecbdata->diff_words->style =
1082 &diff_words_styles[i];
1083 break;
1084 }
1085 }
1086 if (want_color(o->use_color)) {
1087 struct diff_words_style *st = ecbdata->diff_words->style;
1088 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1089 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1090 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1091 }
1092 }
1093
1094 static void free_diff_words_data(struct emit_callback *ecbdata)
1095 {
1096 if (ecbdata->diff_words) {
1097 diff_words_flush(ecbdata);
1098 free (ecbdata->diff_words->opt);
1099 free (ecbdata->diff_words->minus.text.ptr);
1100 free (ecbdata->diff_words->minus.orig);
1101 free (ecbdata->diff_words->plus.text.ptr);
1102 free (ecbdata->diff_words->plus.orig);
1103 if (ecbdata->diff_words->word_regex) {
1104 regfree(ecbdata->diff_words->word_regex);
1105 free(ecbdata->diff_words->word_regex);
1106 }
1107 free(ecbdata->diff_words);
1108 ecbdata->diff_words = NULL;
1109 }
1110 }
1111
1112 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1113 {
1114 if (want_color(diff_use_color))
1115 return diff_colors[ix];
1116 return "";
1117 }
1118
1119 const char *diff_line_prefix(struct diff_options *opt)
1120 {
1121 struct strbuf *msgbuf;
1122 if (!opt->output_prefix)
1123 return "";
1124
1125 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1126 return msgbuf->buf;
1127 }
1128
1129 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1130 {
1131 const char *cp;
1132 unsigned long allot;
1133 size_t l = len;
1134
1135 if (ecb->truncate)
1136 return ecb->truncate(line, len);
1137 cp = line;
1138 allot = l;
1139 while (0 < l) {
1140 (void) utf8_width(&cp, &l);
1141 if (!cp)
1142 break; /* truncated in the middle? */
1143 }
1144 return allot - l;
1145 }
1146
1147 static void find_lno(const char *line, struct emit_callback *ecbdata)
1148 {
1149 const char *p;
1150 ecbdata->lno_in_preimage = 0;
1151 ecbdata->lno_in_postimage = 0;
1152 p = strchr(line, '-');
1153 if (!p)
1154 return; /* cannot happen */
1155 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1156 p = strchr(p, '+');
1157 if (!p)
1158 return; /* cannot happen */
1159 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1160 }
1161
1162 static void fn_out_consume(void *priv, char *line, unsigned long len)
1163 {
1164 struct emit_callback *ecbdata = priv;
1165 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1166 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1167 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1168 struct diff_options *o = ecbdata->opt;
1169 const char *line_prefix = diff_line_prefix(o);
1170
1171 if (ecbdata->header) {
1172 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1173 strbuf_reset(ecbdata->header);
1174 ecbdata->header = NULL;
1175 }
1176 *(ecbdata->found_changesp) = 1;
1177
1178 if (ecbdata->label_path[0]) {
1179 const char *name_a_tab, *name_b_tab;
1180
1181 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1182 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1183
1184 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1185 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1186 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1187 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1188 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1189 }
1190
1191 if (diff_suppress_blank_empty
1192 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1193 line[0] = '\n';
1194 len = 1;
1195 }
1196
1197 if (line[0] == '@') {
1198 if (ecbdata->diff_words)
1199 diff_words_flush(ecbdata);
1200 len = sane_truncate_line(ecbdata, line, len);
1201 find_lno(line, ecbdata);
1202 emit_hunk_header(ecbdata, line, len);
1203 if (line[len-1] != '\n')
1204 putc('\n', ecbdata->opt->file);
1205 return;
1206 }
1207
1208 if (len < 1) {
1209 emit_line(ecbdata->opt, reset, reset, line, len);
1210 if (ecbdata->diff_words
1211 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1212 fputs("~\n", ecbdata->opt->file);
1213 return;
1214 }
1215
1216 if (ecbdata->diff_words) {
1217 if (line[0] == '-') {
1218 diff_words_append(line, len,
1219 &ecbdata->diff_words->minus);
1220 return;
1221 } else if (line[0] == '+') {
1222 diff_words_append(line, len,
1223 &ecbdata->diff_words->plus);
1224 return;
1225 } else if (starts_with(line, "\\ ")) {
1226 /*
1227 * Eat the "no newline at eof" marker as if we
1228 * saw a "+" or "-" line with nothing on it,
1229 * and return without diff_words_flush() to
1230 * defer processing. If this is the end of
1231 * preimage, more "+" lines may come after it.
1232 */
1233 return;
1234 }
1235 diff_words_flush(ecbdata);
1236 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1237 emit_line(ecbdata->opt, plain, reset, line, len);
1238 fputs("~\n", ecbdata->opt->file);
1239 } else {
1240 /*
1241 * Skip the prefix character, if any. With
1242 * diff_suppress_blank_empty, there may be
1243 * none.
1244 */
1245 if (line[0] != '\n') {
1246 line++;
1247 len--;
1248 }
1249 emit_line(ecbdata->opt, plain, reset, line, len);
1250 }
1251 return;
1252 }
1253
1254 if (line[0] != '+') {
1255 const char *color =
1256 diff_get_color(ecbdata->color_diff,
1257 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1258 ecbdata->lno_in_preimage++;
1259 if (line[0] == ' ')
1260 ecbdata->lno_in_postimage++;
1261 emit_line(ecbdata->opt, color, reset, line, len);
1262 } else {
1263 ecbdata->lno_in_postimage++;
1264 emit_add_line(reset, ecbdata, line + 1, len - 1);
1265 }
1266 }
1267
1268 static char *pprint_rename(const char *a, const char *b)
1269 {
1270 const char *old = a;
1271 const char *new = b;
1272 struct strbuf name = STRBUF_INIT;
1273 int pfx_length, sfx_length;
1274 int pfx_adjust_for_slash;
1275 int len_a = strlen(a);
1276 int len_b = strlen(b);
1277 int a_midlen, b_midlen;
1278 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1279 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1280
1281 if (qlen_a || qlen_b) {
1282 quote_c_style(a, &name, NULL, 0);
1283 strbuf_addstr(&name, " => ");
1284 quote_c_style(b, &name, NULL, 0);
1285 return strbuf_detach(&name, NULL);
1286 }
1287
1288 /* Find common prefix */
1289 pfx_length = 0;
1290 while (*old && *new && *old == *new) {
1291 if (*old == '/')
1292 pfx_length = old - a + 1;
1293 old++;
1294 new++;
1295 }
1296
1297 /* Find common suffix */
1298 old = a + len_a;
1299 new = b + len_b;
1300 sfx_length = 0;
1301 /*
1302 * If there is a common prefix, it must end in a slash. In
1303 * that case we let this loop run 1 into the prefix to see the
1304 * same slash.
1305 *
1306 * If there is no common prefix, we cannot do this as it would
1307 * underrun the input strings.
1308 */
1309 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1310 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1311 b + pfx_length - pfx_adjust_for_slash <= new &&
1312 *old == *new) {
1313 if (*old == '/')
1314 sfx_length = len_a - (old - a);
1315 old--;
1316 new--;
1317 }
1318
1319 /*
1320 * pfx{mid-a => mid-b}sfx
1321 * {pfx-a => pfx-b}sfx
1322 * pfx{sfx-a => sfx-b}
1323 * name-a => name-b
1324 */
1325 a_midlen = len_a - pfx_length - sfx_length;
1326 b_midlen = len_b - pfx_length - sfx_length;
1327 if (a_midlen < 0)
1328 a_midlen = 0;
1329 if (b_midlen < 0)
1330 b_midlen = 0;
1331
1332 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1333 if (pfx_length + sfx_length) {
1334 strbuf_add(&name, a, pfx_length);
1335 strbuf_addch(&name, '{');
1336 }
1337 strbuf_add(&name, a + pfx_length, a_midlen);
1338 strbuf_addstr(&name, " => ");
1339 strbuf_add(&name, b + pfx_length, b_midlen);
1340 if (pfx_length + sfx_length) {
1341 strbuf_addch(&name, '}');
1342 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1343 }
1344 return strbuf_detach(&name, NULL);
1345 }
1346
1347 struct diffstat_t {
1348 int nr;
1349 int alloc;
1350 struct diffstat_file {
1351 char *from_name;
1352 char *name;
1353 char *print_name;
1354 unsigned is_unmerged:1;
1355 unsigned is_binary:1;
1356 unsigned is_renamed:1;
1357 unsigned is_interesting:1;
1358 uintmax_t added, deleted;
1359 } **files;
1360 };
1361
1362 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1363 const char *name_a,
1364 const char *name_b)
1365 {
1366 struct diffstat_file *x;
1367 x = xcalloc(1, sizeof(*x));
1368 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1369 diffstat->files[diffstat->nr++] = x;
1370 if (name_b) {
1371 x->from_name = xstrdup(name_a);
1372 x->name = xstrdup(name_b);
1373 x->is_renamed = 1;
1374 }
1375 else {
1376 x->from_name = NULL;
1377 x->name = xstrdup(name_a);
1378 }
1379 return x;
1380 }
1381
1382 static void diffstat_consume(void *priv, char *line, unsigned long len)
1383 {
1384 struct diffstat_t *diffstat = priv;
1385 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1386
1387 if (line[0] == '+')
1388 x->added++;
1389 else if (line[0] == '-')
1390 x->deleted++;
1391 }
1392
1393 const char mime_boundary_leader[] = "------------";
1394
1395 static int scale_linear(int it, int width, int max_change)
1396 {
1397 if (!it)
1398 return 0;
1399 /*
1400 * make sure that at least one '-' or '+' is printed if
1401 * there is any change to this path. The easiest way is to
1402 * scale linearly as if the alloted width is one column shorter
1403 * than it is, and then add 1 to the result.
1404 */
1405 return 1 + (it * (width - 1) / max_change);
1406 }
1407
1408 static void show_name(FILE *file,
1409 const char *prefix, const char *name, int len)
1410 {
1411 fprintf(file, " %s%-*s |", prefix, len, name);
1412 }
1413
1414 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1415 {
1416 if (cnt <= 0)
1417 return;
1418 fprintf(file, "%s", set);
1419 while (cnt--)
1420 putc(ch, file);
1421 fprintf(file, "%s", reset);
1422 }
1423
1424 static void fill_print_name(struct diffstat_file *file)
1425 {
1426 char *pname;
1427
1428 if (file->print_name)
1429 return;
1430
1431 if (!file->is_renamed) {
1432 struct strbuf buf = STRBUF_INIT;
1433 if (quote_c_style(file->name, &buf, NULL, 0)) {
1434 pname = strbuf_detach(&buf, NULL);
1435 } else {
1436 pname = file->name;
1437 strbuf_release(&buf);
1438 }
1439 } else {
1440 pname = pprint_rename(file->from_name, file->name);
1441 }
1442 file->print_name = pname;
1443 }
1444
1445 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1446 {
1447 struct strbuf sb = STRBUF_INIT;
1448 int ret;
1449
1450 if (!files) {
1451 assert(insertions == 0 && deletions == 0);
1452 return fprintf(fp, "%s\n", " 0 files changed");
1453 }
1454
1455 strbuf_addf(&sb,
1456 (files == 1) ? " %d file changed" : " %d files changed",
1457 files);
1458
1459 /*
1460 * For binary diff, the caller may want to print "x files
1461 * changed" with insertions == 0 && deletions == 0.
1462 *
1463 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1464 * is probably less confusing (i.e skip over "2 files changed
1465 * but nothing about added/removed lines? Is this a bug in Git?").
1466 */
1467 if (insertions || deletions == 0) {
1468 strbuf_addf(&sb,
1469 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1470 insertions);
1471 }
1472
1473 if (deletions || insertions == 0) {
1474 strbuf_addf(&sb,
1475 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1476 deletions);
1477 }
1478 strbuf_addch(&sb, '\n');
1479 ret = fputs(sb.buf, fp);
1480 strbuf_release(&sb);
1481 return ret;
1482 }
1483
1484 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1485 {
1486 int i, len, add, del, adds = 0, dels = 0;
1487 uintmax_t max_change = 0, max_len = 0;
1488 int total_files = data->nr, count;
1489 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1490 const char *reset, *add_c, *del_c;
1491 const char *line_prefix = "";
1492 int extra_shown = 0;
1493
1494 if (data->nr == 0)
1495 return;
1496
1497 line_prefix = diff_line_prefix(options);
1498 count = options->stat_count ? options->stat_count : data->nr;
1499
1500 reset = diff_get_color_opt(options, DIFF_RESET);
1501 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1502 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1503
1504 /*
1505 * Find the longest filename and max number of changes
1506 */
1507 for (i = 0; (i < count) && (i < data->nr); i++) {
1508 struct diffstat_file *file = data->files[i];
1509 uintmax_t change = file->added + file->deleted;
1510
1511 if (!file->is_interesting && (change == 0)) {
1512 count++; /* not shown == room for one more */
1513 continue;
1514 }
1515 fill_print_name(file);
1516 len = strlen(file->print_name);
1517 if (max_len < len)
1518 max_len = len;
1519
1520 if (file->is_unmerged) {
1521 /* "Unmerged" is 8 characters */
1522 bin_width = bin_width < 8 ? 8 : bin_width;
1523 continue;
1524 }
1525 if (file->is_binary) {
1526 /* "Bin XXX -> YYY bytes" */
1527 int w = 14 + decimal_width(file->added)
1528 + decimal_width(file->deleted);
1529 bin_width = bin_width < w ? w : bin_width;
1530 /* Display change counts aligned with "Bin" */
1531 number_width = 3;
1532 continue;
1533 }
1534
1535 if (max_change < change)
1536 max_change = change;
1537 }
1538 count = i; /* where we can stop scanning in data->files[] */
1539
1540 /*
1541 * We have width = stat_width or term_columns() columns total.
1542 * We want a maximum of min(max_len, stat_name_width) for the name part.
1543 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1544 * We also need 1 for " " and 4 + decimal_width(max_change)
1545 * for " | NNNN " and one the empty column at the end, altogether
1546 * 6 + decimal_width(max_change).
1547 *
1548 * If there's not enough space, we will use the smaller of
1549 * stat_name_width (if set) and 5/8*width for the filename,
1550 * and the rest for constant elements + graph part, but no more
1551 * than stat_graph_width for the graph part.
1552 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1553 * for the standard terminal size).
1554 *
1555 * In other words: stat_width limits the maximum width, and
1556 * stat_name_width fixes the maximum width of the filename,
1557 * and is also used to divide available columns if there
1558 * aren't enough.
1559 *
1560 * Binary files are displayed with "Bin XXX -> YYY bytes"
1561 * instead of the change count and graph. This part is treated
1562 * similarly to the graph part, except that it is not
1563 * "scaled". If total width is too small to accommodate the
1564 * guaranteed minimum width of the filename part and the
1565 * separators and this message, this message will "overflow"
1566 * making the line longer than the maximum width.
1567 */
1568
1569 if (options->stat_width == -1)
1570 width = term_columns() - options->output_prefix_length;
1571 else
1572 width = options->stat_width ? options->stat_width : 80;
1573 number_width = decimal_width(max_change) > number_width ?
1574 decimal_width(max_change) : number_width;
1575
1576 if (options->stat_graph_width == -1)
1577 options->stat_graph_width = diff_stat_graph_width;
1578
1579 /*
1580 * Guarantee 3/8*16==6 for the graph part
1581 * and 5/8*16==10 for the filename part
1582 */
1583 if (width < 16 + 6 + number_width)
1584 width = 16 + 6 + number_width;
1585
1586 /*
1587 * First assign sizes that are wanted, ignoring available width.
1588 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1589 * starting from "XXX" should fit in graph_width.
1590 */
1591 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1592 if (options->stat_graph_width &&
1593 options->stat_graph_width < graph_width)
1594 graph_width = options->stat_graph_width;
1595
1596 name_width = (options->stat_name_width > 0 &&
1597 options->stat_name_width < max_len) ?
1598 options->stat_name_width : max_len;
1599
1600 /*
1601 * Adjust adjustable widths not to exceed maximum width
1602 */
1603 if (name_width + number_width + 6 + graph_width > width) {
1604 if (graph_width > width * 3/8 - number_width - 6) {
1605 graph_width = width * 3/8 - number_width - 6;
1606 if (graph_width < 6)
1607 graph_width = 6;
1608 }
1609
1610 if (options->stat_graph_width &&
1611 graph_width > options->stat_graph_width)
1612 graph_width = options->stat_graph_width;
1613 if (name_width > width - number_width - 6 - graph_width)
1614 name_width = width - number_width - 6 - graph_width;
1615 else
1616 graph_width = width - number_width - 6 - name_width;
1617 }
1618
1619 /*
1620 * From here name_width is the width of the name area,
1621 * and graph_width is the width of the graph area.
1622 * max_change is used to scale graph properly.
1623 */
1624 for (i = 0; i < count; i++) {
1625 const char *prefix = "";
1626 struct diffstat_file *file = data->files[i];
1627 char *name = file->print_name;
1628 uintmax_t added = file->added;
1629 uintmax_t deleted = file->deleted;
1630 int name_len;
1631
1632 if (!file->is_interesting && (added + deleted == 0))
1633 continue;
1634
1635 /*
1636 * "scale" the filename
1637 */
1638 len = name_width;
1639 name_len = strlen(name);
1640 if (name_width < name_len) {
1641 char *slash;
1642 prefix = "...";
1643 len -= 3;
1644 name += name_len - len;
1645 slash = strchr(name, '/');
1646 if (slash)
1647 name = slash;
1648 }
1649
1650 if (file->is_binary) {
1651 fprintf(options->file, "%s", line_prefix);
1652 show_name(options->file, prefix, name, len);
1653 fprintf(options->file, " %*s", number_width, "Bin");
1654 if (!added && !deleted) {
1655 putc('\n', options->file);
1656 continue;
1657 }
1658 fprintf(options->file, " %s%"PRIuMAX"%s",
1659 del_c, deleted, reset);
1660 fprintf(options->file, " -> ");
1661 fprintf(options->file, "%s%"PRIuMAX"%s",
1662 add_c, added, reset);
1663 fprintf(options->file, " bytes");
1664 fprintf(options->file, "\n");
1665 continue;
1666 }
1667 else if (file->is_unmerged) {
1668 fprintf(options->file, "%s", line_prefix);
1669 show_name(options->file, prefix, name, len);
1670 fprintf(options->file, " Unmerged\n");
1671 continue;
1672 }
1673
1674 /*
1675 * scale the add/delete
1676 */
1677 add = added;
1678 del = deleted;
1679
1680 if (graph_width <= max_change) {
1681 int total = scale_linear(add + del, graph_width, max_change);
1682 if (total < 2 && add && del)
1683 /* width >= 2 due to the sanity check */
1684 total = 2;
1685 if (add < del) {
1686 add = scale_linear(add, graph_width, max_change);
1687 del = total - add;
1688 } else {
1689 del = scale_linear(del, graph_width, max_change);
1690 add = total - del;
1691 }
1692 }
1693 fprintf(options->file, "%s", line_prefix);
1694 show_name(options->file, prefix, name, len);
1695 fprintf(options->file, " %*"PRIuMAX"%s",
1696 number_width, added + deleted,
1697 added + deleted ? " " : "");
1698 show_graph(options->file, '+', add, add_c, reset);
1699 show_graph(options->file, '-', del, del_c, reset);
1700 fprintf(options->file, "\n");
1701 }
1702
1703 for (i = 0; i < data->nr; i++) {
1704 struct diffstat_file *file = data->files[i];
1705 uintmax_t added = file->added;
1706 uintmax_t deleted = file->deleted;
1707
1708 if (file->is_unmerged ||
1709 (!file->is_interesting && (added + deleted == 0))) {
1710 total_files--;
1711 continue;
1712 }
1713
1714 if (!file->is_binary) {
1715 adds += added;
1716 dels += deleted;
1717 }
1718 if (i < count)
1719 continue;
1720 if (!extra_shown)
1721 fprintf(options->file, "%s ...\n", line_prefix);
1722 extra_shown = 1;
1723 }
1724 fprintf(options->file, "%s", line_prefix);
1725 print_stat_summary(options->file, total_files, adds, dels);
1726 }
1727
1728 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1729 {
1730 int i, adds = 0, dels = 0, total_files = data->nr;
1731
1732 if (data->nr == 0)
1733 return;
1734
1735 for (i = 0; i < data->nr; i++) {
1736 int added = data->files[i]->added;
1737 int deleted= data->files[i]->deleted;
1738
1739 if (data->files[i]->is_unmerged ||
1740 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1741 total_files--;
1742 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1743 adds += added;
1744 dels += deleted;
1745 }
1746 }
1747 fprintf(options->file, "%s", diff_line_prefix(options));
1748 print_stat_summary(options->file, total_files, adds, dels);
1749 }
1750
1751 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1752 {
1753 int i;
1754
1755 if (data->nr == 0)
1756 return;
1757
1758 for (i = 0; i < data->nr; i++) {
1759 struct diffstat_file *file = data->files[i];
1760
1761 fprintf(options->file, "%s", diff_line_prefix(options));
1762
1763 if (file->is_binary)
1764 fprintf(options->file, "-\t-\t");
1765 else
1766 fprintf(options->file,
1767 "%"PRIuMAX"\t%"PRIuMAX"\t",
1768 file->added, file->deleted);
1769 if (options->line_termination) {
1770 fill_print_name(file);
1771 if (!file->is_renamed)
1772 write_name_quoted(file->name, options->file,
1773 options->line_termination);
1774 else {
1775 fputs(file->print_name, options->file);
1776 putc(options->line_termination, options->file);
1777 }
1778 } else {
1779 if (file->is_renamed) {
1780 putc('\0', options->file);
1781 write_name_quoted(file->from_name, options->file, '\0');
1782 }
1783 write_name_quoted(file->name, options->file, '\0');
1784 }
1785 }
1786 }
1787
1788 struct dirstat_file {
1789 const char *name;
1790 unsigned long changed;
1791 };
1792
1793 struct dirstat_dir {
1794 struct dirstat_file *files;
1795 int alloc, nr, permille, cumulative;
1796 };
1797
1798 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1799 unsigned long changed, const char *base, int baselen)
1800 {
1801 unsigned long this_dir = 0;
1802 unsigned int sources = 0;
1803 const char *line_prefix = diff_line_prefix(opt);
1804
1805 while (dir->nr) {
1806 struct dirstat_file *f = dir->files;
1807 int namelen = strlen(f->name);
1808 unsigned long this;
1809 char *slash;
1810
1811 if (namelen < baselen)
1812 break;
1813 if (memcmp(f->name, base, baselen))
1814 break;
1815 slash = strchr(f->name + baselen, '/');
1816 if (slash) {
1817 int newbaselen = slash + 1 - f->name;
1818 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1819 sources++;
1820 } else {
1821 this = f->changed;
1822 dir->files++;
1823 dir->nr--;
1824 sources += 2;
1825 }
1826 this_dir += this;
1827 }
1828
1829 /*
1830 * We don't report dirstat's for
1831 * - the top level
1832 * - or cases where everything came from a single directory
1833 * under this directory (sources == 1).
1834 */
1835 if (baselen && sources != 1) {
1836 if (this_dir) {
1837 int permille = this_dir * 1000 / changed;
1838 if (permille >= dir->permille) {
1839 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1840 permille / 10, permille % 10, baselen, base);
1841 if (!dir->cumulative)
1842 return 0;
1843 }
1844 }
1845 }
1846 return this_dir;
1847 }
1848
1849 static int dirstat_compare(const void *_a, const void *_b)
1850 {
1851 const struct dirstat_file *a = _a;
1852 const struct dirstat_file *b = _b;
1853 return strcmp(a->name, b->name);
1854 }
1855
1856 static void show_dirstat(struct diff_options *options)
1857 {
1858 int i;
1859 unsigned long changed;
1860 struct dirstat_dir dir;
1861 struct diff_queue_struct *q = &diff_queued_diff;
1862
1863 dir.files = NULL;
1864 dir.alloc = 0;
1865 dir.nr = 0;
1866 dir.permille = options->dirstat_permille;
1867 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1868
1869 changed = 0;
1870 for (i = 0; i < q->nr; i++) {
1871 struct diff_filepair *p = q->queue[i];
1872 const char *name;
1873 unsigned long copied, added, damage;
1874 int content_changed;
1875
1876 name = p->two->path ? p->two->path : p->one->path;
1877
1878 if (p->one->sha1_valid && p->two->sha1_valid)
1879 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1880 else
1881 content_changed = 1;
1882
1883 if (!content_changed) {
1884 /*
1885 * The SHA1 has not changed, so pre-/post-content is
1886 * identical. We can therefore skip looking at the
1887 * file contents altogether.
1888 */
1889 damage = 0;
1890 goto found_damage;
1891 }
1892
1893 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1894 /*
1895 * In --dirstat-by-file mode, we don't really need to
1896 * look at the actual file contents at all.
1897 * The fact that the SHA1 changed is enough for us to
1898 * add this file to the list of results
1899 * (with each file contributing equal damage).
1900 */
1901 damage = 1;
1902 goto found_damage;
1903 }
1904
1905 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1906 diff_populate_filespec(p->one, 0);
1907 diff_populate_filespec(p->two, 0);
1908 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1909 &copied, &added);
1910 diff_free_filespec_data(p->one);
1911 diff_free_filespec_data(p->two);
1912 } else if (DIFF_FILE_VALID(p->one)) {
1913 diff_populate_filespec(p->one, 1);
1914 copied = added = 0;
1915 diff_free_filespec_data(p->one);
1916 } else if (DIFF_FILE_VALID(p->two)) {
1917 diff_populate_filespec(p->two, 1);
1918 copied = 0;
1919 added = p->two->size;
1920 diff_free_filespec_data(p->two);
1921 } else
1922 continue;
1923
1924 /*
1925 * Original minus copied is the removed material,
1926 * added is the new material. They are both damages
1927 * made to the preimage.
1928 * If the resulting damage is zero, we know that
1929 * diffcore_count_changes() considers the two entries to
1930 * be identical, but since content_changed is true, we
1931 * know that there must have been _some_ kind of change,
1932 * so we force all entries to have damage > 0.
1933 */
1934 damage = (p->one->size - copied) + added;
1935 if (!damage)
1936 damage = 1;
1937
1938 found_damage:
1939 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1940 dir.files[dir.nr].name = name;
1941 dir.files[dir.nr].changed = damage;
1942 changed += damage;
1943 dir.nr++;
1944 }
1945
1946 /* This can happen even with many files, if everything was renames */
1947 if (!changed)
1948 return;
1949
1950 /* Show all directories with more than x% of the changes */
1951 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1952 gather_dirstat(options, &dir, changed, "", 0);
1953 }
1954
1955 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1956 {
1957 int i;
1958 unsigned long changed;
1959 struct dirstat_dir dir;
1960
1961 if (data->nr == 0)
1962 return;
1963
1964 dir.files = NULL;
1965 dir.alloc = 0;
1966 dir.nr = 0;
1967 dir.permille = options->dirstat_permille;
1968 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1969
1970 changed = 0;
1971 for (i = 0; i < data->nr; i++) {
1972 struct diffstat_file *file = data->files[i];
1973 unsigned long damage = file->added + file->deleted;
1974 if (file->is_binary)
1975 /*
1976 * binary files counts bytes, not lines. Must find some
1977 * way to normalize binary bytes vs. textual lines.
1978 * The following heuristic assumes that there are 64
1979 * bytes per "line".
1980 * This is stupid and ugly, but very cheap...
1981 */
1982 damage = (damage + 63) / 64;
1983 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1984 dir.files[dir.nr].name = file->name;
1985 dir.files[dir.nr].changed = damage;
1986 changed += damage;
1987 dir.nr++;
1988 }
1989
1990 /* This can happen even with many files, if everything was renames */
1991 if (!changed)
1992 return;
1993
1994 /* Show all directories with more than x% of the changes */
1995 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1996 gather_dirstat(options, &dir, changed, "", 0);
1997 }
1998
1999 static void free_diffstat_info(struct diffstat_t *diffstat)
2000 {
2001 int i;
2002 for (i = 0; i < diffstat->nr; i++) {
2003 struct diffstat_file *f = diffstat->files[i];
2004 if (f->name != f->print_name)
2005 free(f->print_name);
2006 free(f->name);
2007 free(f->from_name);
2008 free(f);
2009 }
2010 free(diffstat->files);
2011 }
2012
2013 struct checkdiff_t {
2014 const char *filename;
2015 int lineno;
2016 int conflict_marker_size;
2017 struct diff_options *o;
2018 unsigned ws_rule;
2019 unsigned status;
2020 };
2021
2022 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2023 {
2024 char firstchar;
2025 int cnt;
2026
2027 if (len < marker_size + 1)
2028 return 0;
2029 firstchar = line[0];
2030 switch (firstchar) {
2031 case '=': case '>': case '<': case '|':
2032 break;
2033 default:
2034 return 0;
2035 }
2036 for (cnt = 1; cnt < marker_size; cnt++)
2037 if (line[cnt] != firstchar)
2038 return 0;
2039 /* line[1] thru line[marker_size-1] are same as firstchar */
2040 if (len < marker_size + 1 || !isspace(line[marker_size]))
2041 return 0;
2042 return 1;
2043 }
2044
2045 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2046 {
2047 struct checkdiff_t *data = priv;
2048 int marker_size = data->conflict_marker_size;
2049 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2050 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2051 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2052 char *err;
2053 const char *line_prefix;
2054
2055 assert(data->o);
2056 line_prefix = diff_line_prefix(data->o);
2057
2058 if (line[0] == '+') {
2059 unsigned bad;
2060 data->lineno++;
2061 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2062 data->status |= 1;
2063 fprintf(data->o->file,
2064 "%s%s:%d: leftover conflict marker\n",
2065 line_prefix, data->filename, data->lineno);
2066 }
2067 bad = ws_check(line + 1, len - 1, data->ws_rule);
2068 if (!bad)
2069 return;
2070 data->status |= bad;
2071 err = whitespace_error_string(bad);
2072 fprintf(data->o->file, "%s%s:%d: %s.\n",
2073 line_prefix, data->filename, data->lineno, err);
2074 free(err);
2075 emit_line(data->o, set, reset, line, 1);
2076 ws_check_emit(line + 1, len - 1, data->ws_rule,
2077 data->o->file, set, reset, ws);
2078 } else if (line[0] == ' ') {
2079 data->lineno++;
2080 } else if (line[0] == '@') {
2081 char *plus = strchr(line, '+');
2082 if (plus)
2083 data->lineno = strtol(plus, NULL, 10) - 1;
2084 else
2085 die("invalid diff");
2086 }
2087 }
2088
2089 static unsigned char *deflate_it(char *data,
2090 unsigned long size,
2091 unsigned long *result_size)
2092 {
2093 int bound;
2094 unsigned char *deflated;
2095 git_zstream stream;
2096
2097 memset(&stream, 0, sizeof(stream));
2098 git_deflate_init(&stream, zlib_compression_level);
2099 bound = git_deflate_bound(&stream, size);
2100 deflated = xmalloc(bound);
2101 stream.next_out = deflated;
2102 stream.avail_out = bound;
2103
2104 stream.next_in = (unsigned char *)data;
2105 stream.avail_in = size;
2106 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2107 ; /* nothing */
2108 git_deflate_end(&stream);
2109 *result_size = stream.total_out;
2110 return deflated;
2111 }
2112
2113 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2114 const char *prefix)
2115 {
2116 void *cp;
2117 void *delta;
2118 void *deflated;
2119 void *data;
2120 unsigned long orig_size;
2121 unsigned long delta_size;
2122 unsigned long deflate_size;
2123 unsigned long data_size;
2124
2125 /* We could do deflated delta, or we could do just deflated two,
2126 * whichever is smaller.
2127 */
2128 delta = NULL;
2129 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2130 if (one->size && two->size) {
2131 delta = diff_delta(one->ptr, one->size,
2132 two->ptr, two->size,
2133 &delta_size, deflate_size);
2134 if (delta) {
2135 void *to_free = delta;
2136 orig_size = delta_size;
2137 delta = deflate_it(delta, delta_size, &delta_size);
2138 free(to_free);
2139 }
2140 }
2141
2142 if (delta && delta_size < deflate_size) {
2143 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2144 free(deflated);
2145 data = delta;
2146 data_size = delta_size;
2147 }
2148 else {
2149 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2150 free(delta);
2151 data = deflated;
2152 data_size = deflate_size;
2153 }
2154
2155 /* emit data encoded in base85 */
2156 cp = data;
2157 while (data_size) {
2158 int bytes = (52 < data_size) ? 52 : data_size;
2159 char line[70];
2160 data_size -= bytes;
2161 if (bytes <= 26)
2162 line[0] = bytes + 'A' - 1;
2163 else
2164 line[0] = bytes - 26 + 'a' - 1;
2165 encode_85(line + 1, cp, bytes);
2166 cp = (char *) cp + bytes;
2167 fprintf(file, "%s", prefix);
2168 fputs(line, file);
2169 fputc('\n', file);
2170 }
2171 fprintf(file, "%s\n", prefix);
2172 free(data);
2173 }
2174
2175 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2176 const char *prefix)
2177 {
2178 fprintf(file, "%sGIT binary patch\n", prefix);
2179 emit_binary_diff_body(file, one, two, prefix);
2180 emit_binary_diff_body(file, two, one, prefix);
2181 }
2182
2183 int diff_filespec_is_binary(struct diff_filespec *one)
2184 {
2185 if (one->is_binary == -1) {
2186 diff_filespec_load_driver(one);
2187 if (one->driver->binary != -1)
2188 one->is_binary = one->driver->binary;
2189 else {
2190 if (!one->data && DIFF_FILE_VALID(one))
2191 diff_populate_filespec(one, 0);
2192 if (one->data)
2193 one->is_binary = buffer_is_binary(one->data,
2194 one->size);
2195 if (one->is_binary == -1)
2196 one->is_binary = 0;
2197 }
2198 }
2199 return one->is_binary;
2200 }
2201
2202 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2203 {
2204 diff_filespec_load_driver(one);
2205 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2206 }
2207
2208 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2209 {
2210 if (!options->a_prefix)
2211 options->a_prefix = a;
2212 if (!options->b_prefix)
2213 options->b_prefix = b;
2214 }
2215
2216 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2217 {
2218 if (!DIFF_FILE_VALID(one))
2219 return NULL;
2220
2221 diff_filespec_load_driver(one);
2222 return userdiff_get_textconv(one->driver);
2223 }
2224
2225 static void builtin_diff(const char *name_a,
2226 const char *name_b,
2227 struct diff_filespec *one,
2228 struct diff_filespec *two,
2229 const char *xfrm_msg,
2230 int must_show_header,
2231 struct diff_options *o,
2232 int complete_rewrite)
2233 {
2234 mmfile_t mf1, mf2;
2235 const char *lbl[2];
2236 char *a_one, *b_two;
2237 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2238 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2239 const char *a_prefix, *b_prefix;
2240 struct userdiff_driver *textconv_one = NULL;
2241 struct userdiff_driver *textconv_two = NULL;
2242 struct strbuf header = STRBUF_INIT;
2243 const char *line_prefix = diff_line_prefix(o);
2244
2245 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2246 (!one->mode || S_ISGITLINK(one->mode)) &&
2247 (!two->mode || S_ISGITLINK(two->mode))) {
2248 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2249 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2250 show_submodule_summary(o->file, one->path ? one->path : two->path,
2251 line_prefix,
2252 one->sha1, two->sha1, two->dirty_submodule,
2253 meta, del, add, reset);
2254 return;
2255 }
2256
2257 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2258 textconv_one = get_textconv(one);
2259 textconv_two = get_textconv(two);
2260 }
2261
2262 diff_set_mnemonic_prefix(o, "a/", "b/");
2263 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2264 a_prefix = o->b_prefix;
2265 b_prefix = o->a_prefix;
2266 } else {
2267 a_prefix = o->a_prefix;
2268 b_prefix = o->b_prefix;
2269 }
2270
2271 /* Never use a non-valid filename anywhere if at all possible */
2272 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2273 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2274
2275 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2276 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2277 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2278 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2279 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2280 if (lbl[0][0] == '/') {
2281 /* /dev/null */
2282 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2283 if (xfrm_msg)
2284 strbuf_addstr(&header, xfrm_msg);
2285 must_show_header = 1;
2286 }
2287 else if (lbl[1][0] == '/') {
2288 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2289 if (xfrm_msg)
2290 strbuf_addstr(&header, xfrm_msg);
2291 must_show_header = 1;
2292 }
2293 else {
2294 if (one->mode != two->mode) {
2295 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2296 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2297 must_show_header = 1;
2298 }
2299 if (xfrm_msg)
2300 strbuf_addstr(&header, xfrm_msg);
2301
2302 /*
2303 * we do not run diff between different kind
2304 * of objects.
2305 */
2306 if ((one->mode ^ two->mode) & S_IFMT)
2307 goto free_ab_and_return;
2308 if (complete_rewrite &&
2309 (textconv_one || !diff_filespec_is_binary(one)) &&
2310 (textconv_two || !diff_filespec_is_binary(two))) {
2311 fprintf(o->file, "%s", header.buf);
2312 strbuf_reset(&header);
2313 emit_rewrite_diff(name_a, name_b, one, two,
2314 textconv_one, textconv_two, o);
2315 o->found_changes = 1;
2316 goto free_ab_and_return;
2317 }
2318 }
2319
2320 if (o->irreversible_delete && lbl[1][0] == '/') {
2321 fprintf(o->file, "%s", header.buf);
2322 strbuf_reset(&header);
2323 goto free_ab_and_return;
2324 } else if (!DIFF_OPT_TST(o, TEXT) &&
2325 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2326 (!textconv_two && diff_filespec_is_binary(two)) )) {
2327 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2328 die("unable to read files to diff");
2329 /* Quite common confusing case */
2330 if (mf1.size == mf2.size &&
2331 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2332 if (must_show_header)
2333 fprintf(o->file, "%s", header.buf);
2334 goto free_ab_and_return;
2335 }
2336 fprintf(o->file, "%s", header.buf);
2337 strbuf_reset(&header);
2338 if (DIFF_OPT_TST(o, BINARY))
2339 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2340 else
2341 fprintf(o->file, "%sBinary files %s and %s differ\n",
2342 line_prefix, lbl[0], lbl[1]);
2343 o->found_changes = 1;
2344 } else {
2345 /* Crazy xdl interfaces.. */
2346 const char *diffopts = getenv("GIT_DIFF_OPTS");
2347 const char *v;
2348 xpparam_t xpp;
2349 xdemitconf_t xecfg;
2350 struct emit_callback ecbdata;
2351 const struct userdiff_funcname *pe;
2352
2353 if (must_show_header) {
2354 fprintf(o->file, "%s", header.buf);
2355 strbuf_reset(&header);
2356 }
2357
2358 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2359 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2360
2361 pe = diff_funcname_pattern(one);
2362 if (!pe)
2363 pe = diff_funcname_pattern(two);
2364
2365 memset(&xpp, 0, sizeof(xpp));
2366 memset(&xecfg, 0, sizeof(xecfg));
2367 memset(&ecbdata, 0, sizeof(ecbdata));
2368 ecbdata.label_path = lbl;
2369 ecbdata.color_diff = want_color(o->use_color);
2370 ecbdata.found_changesp = &o->found_changes;
2371 ecbdata.ws_rule = whitespace_rule(name_b);
2372 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2373 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2374 ecbdata.opt = o;
2375 ecbdata.header = header.len ? &header : NULL;
2376 xpp.flags = o->xdl_opts;
2377 xecfg.ctxlen = o->context;
2378 xecfg.interhunkctxlen = o->interhunkcontext;
2379 xecfg.flags = XDL_EMIT_FUNCNAMES;
2380 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2381 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2382 if (pe)
2383 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2384 if (!diffopts)
2385 ;
2386 else if (skip_prefix(diffopts, "--unified=", &v))
2387 xecfg.ctxlen = strtoul(v, NULL, 10);
2388 else if (skip_prefix(diffopts, "-u", &v))
2389 xecfg.ctxlen = strtoul(v, NULL, 10);
2390 if (o->word_diff)
2391 init_diff_words_data(&ecbdata, o, one, two);
2392 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2393 &xpp, &xecfg);
2394 if (o->word_diff)
2395 free_diff_words_data(&ecbdata);
2396 if (textconv_one)
2397 free(mf1.ptr);
2398 if (textconv_two)
2399 free(mf2.ptr);
2400 xdiff_clear_find_func(&xecfg);
2401 }
2402
2403 free_ab_and_return:
2404 strbuf_release(&header);
2405 diff_free_filespec_data(one);
2406 diff_free_filespec_data(two);
2407 free(a_one);
2408 free(b_two);
2409 return;
2410 }
2411
2412 static void builtin_diffstat(const char *name_a, const char *name_b,
2413 struct diff_filespec *one,
2414 struct diff_filespec *two,
2415 struct diffstat_t *diffstat,
2416 struct diff_options *o,
2417 struct diff_filepair *p)
2418 {
2419 mmfile_t mf1, mf2;
2420 struct diffstat_file *data;
2421 int same_contents;
2422 int complete_rewrite = 0;
2423
2424 if (!DIFF_PAIR_UNMERGED(p)) {
2425 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2426 complete_rewrite = 1;
2427 }
2428
2429 data = diffstat_add(diffstat, name_a, name_b);
2430 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2431
2432 if (!one || !two) {
2433 data->is_unmerged = 1;
2434 return;
2435 }
2436
2437 same_contents = !hashcmp(one->sha1, two->sha1);
2438
2439 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2440 data->is_binary = 1;
2441 if (same_contents) {
2442 data->added = 0;
2443 data->deleted = 0;
2444 } else {
2445 data->added = diff_filespec_size(two);
2446 data->deleted = diff_filespec_size(one);
2447 }
2448 }
2449
2450 else if (complete_rewrite) {
2451 diff_populate_filespec(one, 0);
2452 diff_populate_filespec(two, 0);
2453 data->deleted = count_lines(one->data, one->size);
2454 data->added = count_lines(two->data, two->size);
2455 }
2456
2457 else if (!same_contents) {
2458 /* Crazy xdl interfaces.. */
2459 xpparam_t xpp;
2460 xdemitconf_t xecfg;
2461
2462 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2463 die("unable to read files to diff");
2464
2465 memset(&xpp, 0, sizeof(xpp));
2466 memset(&xecfg, 0, sizeof(xecfg));
2467 xpp.flags = o->xdl_opts;
2468 xecfg.ctxlen = o->context;
2469 xecfg.interhunkctxlen = o->interhunkcontext;
2470 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2471 &xpp, &xecfg);
2472 }
2473
2474 diff_free_filespec_data(one);
2475 diff_free_filespec_data(two);
2476 }
2477
2478 static void builtin_checkdiff(const char *name_a, const char *name_b,
2479 const char *attr_path,
2480 struct diff_filespec *one,
2481 struct diff_filespec *two,
2482 struct diff_options *o)
2483 {
2484 mmfile_t mf1, mf2;
2485 struct checkdiff_t data;
2486
2487 if (!two)
2488 return;
2489
2490 memset(&data, 0, sizeof(data));
2491 data.filename = name_b ? name_b : name_a;
2492 data.lineno = 0;
2493 data.o = o;
2494 data.ws_rule = whitespace_rule(attr_path);
2495 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2496
2497 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2498 die("unable to read files to diff");
2499
2500 /*
2501 * All the other codepaths check both sides, but not checking
2502 * the "old" side here is deliberate. We are checking the newly
2503 * introduced changes, and as long as the "new" side is text, we
2504 * can and should check what it introduces.
2505 */
2506 if (diff_filespec_is_binary(two))
2507 goto free_and_return;
2508 else {
2509 /* Crazy xdl interfaces.. */
2510 xpparam_t xpp;
2511 xdemitconf_t xecfg;
2512
2513 memset(&xpp, 0, sizeof(xpp));
2514 memset(&xecfg, 0, sizeof(xecfg));
2515 xecfg.ctxlen = 1; /* at least one context line */
2516 xpp.flags = 0;
2517 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2518 &xpp, &xecfg);
2519
2520 if (data.ws_rule & WS_BLANK_AT_EOF) {
2521 struct emit_callback ecbdata;
2522 int blank_at_eof;
2523
2524 ecbdata.ws_rule = data.ws_rule;
2525 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2526 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2527
2528 if (blank_at_eof) {
2529 static char *err;
2530 if (!err)
2531 err = whitespace_error_string(WS_BLANK_AT_EOF);
2532 fprintf(o->file, "%s:%d: %s.\n",
2533 data.filename, blank_at_eof, err);
2534 data.status = 1; /* report errors */
2535 }
2536 }
2537 }
2538 free_and_return:
2539 diff_free_filespec_data(one);
2540 diff_free_filespec_data(two);
2541 if (data.status)
2542 DIFF_OPT_SET(o, CHECK_FAILED);
2543 }
2544
2545 struct diff_filespec *alloc_filespec(const char *path)
2546 {
2547 int namelen = strlen(path);
2548 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2549
2550 memset(spec, 0, sizeof(*spec));
2551 spec->path = (char *)(spec + 1);
2552 memcpy(spec->path, path, namelen+1);
2553 spec->count = 1;
2554 spec->is_binary = -1;
2555 return spec;
2556 }
2557
2558 void free_filespec(struct diff_filespec *spec)
2559 {
2560 if (!--spec->count) {
2561 diff_free_filespec_data(spec);
2562 free(spec);
2563 }
2564 }
2565
2566 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2567 int sha1_valid, unsigned short mode)
2568 {
2569 if (mode) {
2570 spec->mode = canon_mode(mode);
2571 hashcpy(spec->sha1, sha1);
2572 spec->sha1_valid = sha1_valid;
2573 }
2574 }
2575
2576 /*
2577 * Given a name and sha1 pair, if the index tells us the file in
2578 * the work tree has that object contents, return true, so that
2579 * prepare_temp_file() does not have to inflate and extract.
2580 */
2581 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2582 {
2583 const struct cache_entry *ce;
2584 struct stat st;
2585 int pos, len;
2586
2587 /*
2588 * We do not read the cache ourselves here, because the
2589 * benchmark with my previous version that always reads cache
2590 * shows that it makes things worse for diff-tree comparing
2591 * two linux-2.6 kernel trees in an already checked out work
2592 * tree. This is because most diff-tree comparisons deal with
2593 * only a small number of files, while reading the cache is
2594 * expensive for a large project, and its cost outweighs the
2595 * savings we get by not inflating the object to a temporary
2596 * file. Practically, this code only helps when we are used
2597 * by diff-cache --cached, which does read the cache before
2598 * calling us.
2599 */
2600 if (!active_cache)
2601 return 0;
2602
2603 /* We want to avoid the working directory if our caller
2604 * doesn't need the data in a normal file, this system
2605 * is rather slow with its stat/open/mmap/close syscalls,
2606 * and the object is contained in a pack file. The pack
2607 * is probably already open and will be faster to obtain
2608 * the data through than the working directory. Loose
2609 * objects however would tend to be slower as they need
2610 * to be individually opened and inflated.
2611 */
2612 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2613 return 0;
2614
2615 len = strlen(name);
2616 pos = cache_name_pos(name, len);
2617 if (pos < 0)
2618 return 0;
2619 ce = active_cache[pos];
2620
2621 /*
2622 * This is not the sha1 we are looking for, or
2623 * unreusable because it is not a regular file.
2624 */
2625 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2626 return 0;
2627
2628 /*
2629 * If ce is marked as "assume unchanged", there is no
2630 * guarantee that work tree matches what we are looking for.
2631 */
2632 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2633 return 0;
2634
2635 /*
2636 * If ce matches the file in the work tree, we can reuse it.
2637 */
2638 if (ce_uptodate(ce) ||
2639 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2640 return 1;
2641
2642 return 0;
2643 }
2644
2645 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2646 {
2647 int len;
2648 char *data = xmalloc(100), *dirty = "";
2649
2650 /* Are we looking at the work tree? */
2651 if (s->dirty_submodule)
2652 dirty = "-dirty";
2653
2654 len = snprintf(data, 100,
2655 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2656 s->data = data;
2657 s->size = len;
2658 s->should_free = 1;
2659 if (size_only) {
2660 s->data = NULL;
2661 free(data);
2662 }
2663 return 0;
2664 }
2665
2666 /*
2667 * While doing rename detection and pickaxe operation, we may need to
2668 * grab the data for the blob (or file) for our own in-core comparison.
2669 * diff_filespec has data and size fields for this purpose.
2670 */
2671 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2672 {
2673 int err = 0;
2674 /*
2675 * demote FAIL to WARN to allow inspecting the situation
2676 * instead of refusing.
2677 */
2678 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2679 ? SAFE_CRLF_WARN
2680 : safe_crlf);
2681
2682 if (!DIFF_FILE_VALID(s))
2683 die("internal error: asking to populate invalid file.");
2684 if (S_ISDIR(s->mode))
2685 return -1;
2686
2687 if (s->data)
2688 return 0;
2689
2690 if (size_only && 0 < s->size)
2691 return 0;
2692
2693 if (S_ISGITLINK(s->mode))
2694 return diff_populate_gitlink(s, size_only);
2695
2696 if (!s->sha1_valid ||
2697 reuse_worktree_file(s->path, s->sha1, 0)) {
2698 struct strbuf buf = STRBUF_INIT;
2699 struct stat st;
2700 int fd;
2701
2702 if (lstat(s->path, &st) < 0) {
2703 if (errno == ENOENT) {
2704 err_empty:
2705 err = -1;
2706 empty:
2707 s->data = (char *)"";
2708 s->size = 0;
2709 return err;
2710 }
2711 }
2712 s->size = xsize_t(st.st_size);
2713 if (!s->size)
2714 goto empty;
2715 if (S_ISLNK(st.st_mode)) {
2716 struct strbuf sb = STRBUF_INIT;
2717
2718 if (strbuf_readlink(&sb, s->path, s->size))
2719 goto err_empty;
2720 s->size = sb.len;
2721 s->data = strbuf_detach(&sb, NULL);
2722 s->should_free = 1;
2723 return 0;
2724 }
2725 if (size_only)
2726 return 0;
2727 fd = open(s->path, O_RDONLY);
2728 if (fd < 0)
2729 goto err_empty;
2730 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2731 close(fd);
2732 s->should_munmap = 1;
2733
2734 /*
2735 * Convert from working tree format to canonical git format
2736 */
2737 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2738 size_t size = 0;
2739 munmap(s->data, s->size);
2740 s->should_munmap = 0;
2741 s->data = strbuf_detach(&buf, &size);
2742 s->size = size;
2743 s->should_free = 1;
2744 }
2745 }
2746 else {
2747 enum object_type type;
2748 if (size_only) {
2749 type = sha1_object_info(s->sha1, &s->size);
2750 if (type < 0)
2751 die("unable to read %s", sha1_to_hex(s->sha1));
2752 } else {
2753 s->data = read_sha1_file(s->sha1, &type, &s->size);
2754 if (!s->data)
2755 die("unable to read %s", sha1_to_hex(s->sha1));
2756 s->should_free = 1;
2757 }
2758 }
2759 return 0;
2760 }
2761
2762 void diff_free_filespec_blob(struct diff_filespec *s)
2763 {
2764 if (s->should_free)
2765 free(s->data);
2766 else if (s->should_munmap)
2767 munmap(s->data, s->size);
2768
2769 if (s->should_free || s->should_munmap) {
2770 s->should_free = s->should_munmap = 0;
2771 s->data = NULL;
2772 }
2773 }
2774
2775 void diff_free_filespec_data(struct diff_filespec *s)
2776 {
2777 diff_free_filespec_blob(s);
2778 free(s->cnt_data);
2779 s->cnt_data = NULL;
2780 }
2781
2782 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2783 void *blob,
2784 unsigned long size,
2785 const unsigned char *sha1,
2786 int mode)
2787 {
2788 int fd;
2789 struct strbuf buf = STRBUF_INIT;
2790 struct strbuf template = STRBUF_INIT;
2791 char *path_dup = xstrdup(path);
2792 const char *base = basename(path_dup);
2793
2794 /* Generate "XXXXXX_basename.ext" */
2795 strbuf_addstr(&template, "XXXXXX_");
2796 strbuf_addstr(&template, base);
2797
2798 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2799 strlen(base) + 1);
2800 if (fd < 0)
2801 die_errno("unable to create temp-file");
2802 if (convert_to_working_tree(path,
2803 (const char *)blob, (size_t)size, &buf)) {
2804 blob = buf.buf;
2805 size = buf.len;
2806 }
2807 if (write_in_full(fd, blob, size) != size)
2808 die_errno("unable to write temp-file");
2809 close(fd);
2810 temp->name = temp->tmp_path;
2811 strcpy(temp->hex, sha1_to_hex(sha1));
2812 temp->hex[40] = 0;
2813 sprintf(temp->mode, "%06o", mode);
2814 strbuf_release(&buf);
2815 strbuf_release(&template);
2816 free(path_dup);
2817 }
2818
2819 static struct diff_tempfile *prepare_temp_file(const char *name,
2820 struct diff_filespec *one)
2821 {
2822 struct diff_tempfile *temp = claim_diff_tempfile();
2823
2824 if (!DIFF_FILE_VALID(one)) {
2825 not_a_valid_file:
2826 /* A '-' entry produces this for file-2, and
2827 * a '+' entry produces this for file-1.
2828 */
2829 temp->name = "/dev/null";
2830 strcpy(temp->hex, ".");
2831 strcpy(temp->mode, ".");
2832 return temp;
2833 }
2834
2835 if (!remove_tempfile_installed) {
2836 atexit(remove_tempfile);
2837 sigchain_push_common(remove_tempfile_on_signal);
2838 remove_tempfile_installed = 1;
2839 }
2840
2841 if (!S_ISGITLINK(one->mode) &&
2842 (!one->sha1_valid ||
2843 reuse_worktree_file(name, one->sha1, 1))) {
2844 struct stat st;
2845 if (lstat(name, &st) < 0) {
2846 if (errno == ENOENT)
2847 goto not_a_valid_file;
2848 die_errno("stat(%s)", name);
2849 }
2850 if (S_ISLNK(st.st_mode)) {
2851 struct strbuf sb = STRBUF_INIT;
2852 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2853 die_errno("readlink(%s)", name);
2854 prep_temp_blob(name, temp, sb.buf, sb.len,
2855 (one->sha1_valid ?
2856 one->sha1 : null_sha1),
2857 (one->sha1_valid ?
2858 one->mode : S_IFLNK));
2859 strbuf_release(&sb);
2860 }
2861 else {
2862 /* we can borrow from the file in the work tree */
2863 temp->name = name;
2864 if (!one->sha1_valid)
2865 strcpy(temp->hex, sha1_to_hex(null_sha1));
2866 else
2867 strcpy(temp->hex, sha1_to_hex(one->sha1));
2868 /* Even though we may sometimes borrow the
2869 * contents from the work tree, we always want
2870 * one->mode. mode is trustworthy even when
2871 * !(one->sha1_valid), as long as
2872 * DIFF_FILE_VALID(one).
2873 */
2874 sprintf(temp->mode, "%06o", one->mode);
2875 }
2876 return temp;
2877 }
2878 else {
2879 if (diff_populate_filespec(one, 0))
2880 die("cannot read data blob for %s", one->path);
2881 prep_temp_blob(name, temp, one->data, one->size,
2882 one->sha1, one->mode);
2883 }
2884 return temp;
2885 }
2886
2887 static void add_external_diff_name(struct argv_array *argv,
2888 const char *name,
2889 struct diff_filespec *df)
2890 {
2891 struct diff_tempfile *temp = prepare_temp_file(name, df);
2892 argv_array_push(argv, temp->name);
2893 argv_array_push(argv, temp->hex);
2894 argv_array_push(argv, temp->mode);
2895 }
2896
2897 /* An external diff command takes:
2898 *
2899 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2900 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2901 *
2902 */
2903 static void run_external_diff(const char *pgm,
2904 const char *name,
2905 const char *other,
2906 struct diff_filespec *one,
2907 struct diff_filespec *two,
2908 const char *xfrm_msg,
2909 int complete_rewrite,
2910 struct diff_options *o)
2911 {
2912 struct argv_array argv = ARGV_ARRAY_INIT;
2913 struct argv_array env = ARGV_ARRAY_INIT;
2914 struct diff_queue_struct *q = &diff_queued_diff;
2915
2916 argv_array_push(&argv, pgm);
2917 argv_array_push(&argv, name);
2918
2919 if (one && two) {
2920 add_external_diff_name(&argv, name, one);
2921 if (!other)
2922 add_external_diff_name(&argv, name, two);
2923 else {
2924 add_external_diff_name(&argv, other, two);
2925 argv_array_push(&argv, other);
2926 argv_array_push(&argv, xfrm_msg);
2927 }
2928 }
2929
2930 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
2931 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
2932
2933 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
2934 die(_("external diff died, stopping at %s"), name);
2935
2936 remove_tempfile();
2937 argv_array_clear(&argv);
2938 argv_array_clear(&env);
2939 }
2940
2941 static int similarity_index(struct diff_filepair *p)
2942 {
2943 return p->score * 100 / MAX_SCORE;
2944 }
2945
2946 static void fill_metainfo(struct strbuf *msg,
2947 const char *name,
2948 const char *other,
2949 struct diff_filespec *one,
2950 struct diff_filespec *two,
2951 struct diff_options *o,
2952 struct diff_filepair *p,
2953 int *must_show_header,
2954 int use_color)
2955 {
2956 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2957 const char *reset = diff_get_color(use_color, DIFF_RESET);
2958 const char *line_prefix = diff_line_prefix(o);
2959
2960 *must_show_header = 1;
2961 strbuf_init(msg, PATH_MAX * 2 + 300);
2962 switch (p->status) {
2963 case DIFF_STATUS_COPIED:
2964 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2965 line_prefix, set, similarity_index(p));
2966 strbuf_addf(msg, "%s\n%s%scopy from ",
2967 reset, line_prefix, set);
2968 quote_c_style(name, msg, NULL, 0);
2969 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2970 quote_c_style(other, msg, NULL, 0);
2971 strbuf_addf(msg, "%s\n", reset);
2972 break;
2973 case DIFF_STATUS_RENAMED:
2974 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2975 line_prefix, set, similarity_index(p));
2976 strbuf_addf(msg, "%s\n%s%srename from ",
2977 reset, line_prefix, set);
2978 quote_c_style(name, msg, NULL, 0);
2979 strbuf_addf(msg, "%s\n%s%srename to ",
2980 reset, line_prefix, set);
2981 quote_c_style(other, msg, NULL, 0);
2982 strbuf_addf(msg, "%s\n", reset);
2983 break;
2984 case DIFF_STATUS_MODIFIED:
2985 if (p->score) {
2986 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2987 line_prefix,
2988 set, similarity_index(p), reset);
2989 break;
2990 }
2991 /* fallthru */
2992 default:
2993 *must_show_header = 0;
2994 }
2995 if (one && two && hashcmp(one->sha1, two->sha1)) {
2996 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2997
2998 if (DIFF_OPT_TST(o, BINARY)) {
2999 mmfile_t mf;
3000 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3001 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3002 abbrev = 40;
3003 }
3004 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3005 find_unique_abbrev(one->sha1, abbrev));
3006 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3007 if (one->mode == two->mode)
3008 strbuf_addf(msg, " %06o", one->mode);
3009 strbuf_addf(msg, "%s\n", reset);
3010 }
3011 }
3012
3013 static void run_diff_cmd(const char *pgm,
3014 const char *name,
3015 const char *other,
3016 const char *attr_path,
3017 struct diff_filespec *one,
3018 struct diff_filespec *two,
3019 struct strbuf *msg,
3020 struct diff_options *o,
3021 struct diff_filepair *p)
3022 {
3023 const char *xfrm_msg = NULL;
3024 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3025 int must_show_header = 0;
3026
3027
3028 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3029 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3030 if (drv && drv->external)
3031 pgm = drv->external;
3032 }
3033
3034 if (msg) {
3035 /*
3036 * don't use colors when the header is intended for an
3037 * external diff driver
3038 */
3039 fill_metainfo(msg, name, other, one, two, o, p,
3040 &must_show_header,
3041 want_color(o->use_color) && !pgm);
3042 xfrm_msg = msg->len ? msg->buf : NULL;
3043 }
3044
3045 if (pgm) {
3046 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3047 complete_rewrite, o);
3048 return;
3049 }
3050 if (one && two)
3051 builtin_diff(name, other ? other : name,
3052 one, two, xfrm_msg, must_show_header,
3053 o, complete_rewrite);
3054 else
3055 fprintf(o->file, "* Unmerged path %s\n", name);
3056 }
3057
3058 static void diff_fill_sha1_info(struct diff_filespec *one)
3059 {
3060 if (DIFF_FILE_VALID(one)) {
3061 if (!one->sha1_valid) {
3062 struct stat st;
3063 if (one->is_stdin) {
3064 hashcpy(one->sha1, null_sha1);
3065 return;
3066 }
3067 if (lstat(one->path, &st) < 0)
3068 die_errno("stat '%s'", one->path);
3069 if (index_path(one->sha1, one->path, &st, 0))
3070 die("cannot hash %s", one->path);
3071 }
3072 }
3073 else
3074 hashclr(one->sha1);
3075 }
3076
3077 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3078 {
3079 /* Strip the prefix but do not molest /dev/null and absolute paths */
3080 if (*namep && **namep != '/') {
3081 *namep += prefix_length;
3082 if (**namep == '/')
3083 ++*namep;
3084 }
3085 if (*otherp && **otherp != '/') {
3086 *otherp += prefix_length;
3087 if (**otherp == '/')
3088 ++*otherp;
3089 }
3090 }
3091
3092 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3093 {
3094 const char *pgm = external_diff();
3095 struct strbuf msg;
3096 struct diff_filespec *one = p->one;
3097 struct diff_filespec *two = p->two;
3098 const char *name;
3099 const char *other;
3100 const char *attr_path;
3101
3102 name = p->one->path;
3103 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3104 attr_path = name;
3105 if (o->prefix_length)
3106 strip_prefix(o->prefix_length, &name, &other);
3107
3108 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3109 pgm = NULL;
3110
3111 if (DIFF_PAIR_UNMERGED(p)) {
3112 run_diff_cmd(pgm, name, NULL, attr_path,
3113 NULL, NULL, NULL, o, p);
3114 return;
3115 }
3116
3117 diff_fill_sha1_info(one);
3118 diff_fill_sha1_info(two);
3119
3120 if (!pgm &&
3121 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3122 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3123 /*
3124 * a filepair that changes between file and symlink
3125 * needs to be split into deletion and creation.
3126 */
3127 struct diff_filespec *null = alloc_filespec(two->path);
3128 run_diff_cmd(NULL, name, other, attr_path,
3129 one, null, &msg, o, p);
3130 free(null);
3131 strbuf_release(&msg);
3132
3133 null = alloc_filespec(one->path);
3134 run_diff_cmd(NULL, name, other, attr_path,
3135 null, two, &msg, o, p);
3136 free(null);
3137 }
3138 else
3139 run_diff_cmd(pgm, name, other, attr_path,
3140 one, two, &msg, o, p);
3141
3142 strbuf_release(&msg);
3143 }
3144
3145 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3146 struct diffstat_t *diffstat)
3147 {
3148 const char *name;
3149 const char *other;
3150
3151 if (DIFF_PAIR_UNMERGED(p)) {
3152 /* unmerged */
3153 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3154 return;
3155 }
3156
3157 name = p->one->path;
3158 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3159
3160 if (o->prefix_length)
3161 strip_prefix(o->prefix_length, &name, &other);
3162
3163 diff_fill_sha1_info(p->one);
3164 diff_fill_sha1_info(p->two);
3165
3166 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3167 }
3168
3169 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3170 {
3171 const char *name;
3172 const char *other;
3173 const char *attr_path;
3174
3175 if (DIFF_PAIR_UNMERGED(p)) {
3176 /* unmerged */
3177 return;
3178 }
3179
3180 name = p->one->path;
3181 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3182 attr_path = other ? other : name;
3183
3184 if (o->prefix_length)
3185 strip_prefix(o->prefix_length, &name, &other);
3186
3187 diff_fill_sha1_info(p->one);
3188 diff_fill_sha1_info(p->two);
3189
3190 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3191 }
3192
3193 void diff_setup(struct diff_options *options)
3194 {
3195 memcpy(options, &default_diff_options, sizeof(*options));
3196
3197 options->file = stdout;
3198
3199 options->line_termination = '\n';
3200 options->break_opt = -1;
3201 options->rename_limit = -1;
3202 options->dirstat_permille = diff_dirstat_permille_default;
3203 options->context = diff_context_default;
3204 DIFF_OPT_SET(options, RENAME_EMPTY);
3205
3206 /* pathchange left =NULL by default */
3207 options->change = diff_change;
3208 options->add_remove = diff_addremove;
3209 options->use_color = diff_use_color_default;
3210 options->detect_rename = diff_detect_rename_default;
3211 options->xdl_opts |= diff_algorithm;
3212
3213 options->orderfile = diff_order_file_cfg;
3214
3215 if (diff_no_prefix) {
3216 options->a_prefix = options->b_prefix = "";
3217 } else if (!diff_mnemonic_prefix) {
3218 options->a_prefix = "a/";
3219 options->b_prefix = "b/";
3220 }
3221 }
3222
3223 void diff_setup_done(struct diff_options *options)
3224 {
3225 int count = 0;
3226
3227 if (options->set_default)
3228 options->set_default(options);
3229
3230 if (options->output_format & DIFF_FORMAT_NAME)
3231 count++;
3232 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3233 count++;
3234 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3235 count++;
3236 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3237 count++;
3238 if (count > 1)
3239 die("--name-only, --name-status, --check and -s are mutually exclusive");
3240
3241 /*
3242 * Most of the time we can say "there are changes"
3243 * only by checking if there are changed paths, but
3244 * --ignore-whitespace* options force us to look
3245 * inside contents.
3246 */
3247
3248 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3249 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3250 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3251 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3252 else
3253 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3254
3255 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3256 options->detect_rename = DIFF_DETECT_COPY;
3257
3258 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3259 options->prefix = NULL;
3260 if (options->prefix)
3261 options->prefix_length = strlen(options->prefix);
3262 else
3263 options->prefix_length = 0;
3264
3265 if (options->output_format & (DIFF_FORMAT_NAME |
3266 DIFF_FORMAT_NAME_STATUS |
3267 DIFF_FORMAT_CHECKDIFF |
3268 DIFF_FORMAT_NO_OUTPUT))
3269 options->output_format &= ~(DIFF_FORMAT_RAW |
3270 DIFF_FORMAT_NUMSTAT |
3271 DIFF_FORMAT_DIFFSTAT |
3272 DIFF_FORMAT_SHORTSTAT |
3273 DIFF_FORMAT_DIRSTAT |
3274 DIFF_FORMAT_SUMMARY |
3275 DIFF_FORMAT_PATCH);
3276
3277 /*
3278 * These cases always need recursive; we do not drop caller-supplied
3279 * recursive bits for other formats here.
3280 */
3281 if (options->output_format & (DIFF_FORMAT_PATCH |
3282 DIFF_FORMAT_NUMSTAT |
3283 DIFF_FORMAT_DIFFSTAT |
3284 DIFF_FORMAT_SHORTSTAT |
3285 DIFF_FORMAT_DIRSTAT |
3286 DIFF_FORMAT_SUMMARY |
3287 DIFF_FORMAT_CHECKDIFF))
3288 DIFF_OPT_SET(options, RECURSIVE);
3289 /*
3290 * Also pickaxe would not work very well if you do not say recursive
3291 */
3292 if (options->pickaxe)
3293 DIFF_OPT_SET(options, RECURSIVE);
3294 /*
3295 * When patches are generated, submodules diffed against the work tree
3296 * must be checked for dirtiness too so it can be shown in the output
3297 */
3298 if (options->output_format & DIFF_FORMAT_PATCH)
3299 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3300
3301 if (options->detect_rename && options->rename_limit < 0)
3302 options->rename_limit = diff_rename_limit_default;
3303 if (options->setup & DIFF_SETUP_USE_CACHE) {
3304 if (!active_cache)
3305 /* read-cache does not die even when it fails
3306 * so it is safe for us to do this here. Also
3307 * it does not smudge active_cache or active_nr
3308 * when it fails, so we do not have to worry about
3309 * cleaning it up ourselves either.
3310 */
3311 read_cache();
3312 }
3313 if (options->abbrev <= 0 || 40 < options->abbrev)
3314 options->abbrev = 40; /* full */
3315
3316 /*
3317 * It does not make sense to show the first hit we happened
3318 * to have found. It does not make sense not to return with
3319 * exit code in such a case either.
3320 */
3321 if (DIFF_OPT_TST(options, QUICK)) {
3322 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3323 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3324 }
3325
3326 options->diff_path_counter = 0;
3327
3328 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3329 die(_("--follow requires exactly one pathspec"));
3330 }
3331
3332 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3333 {
3334 char c, *eq;
3335 int len;
3336
3337 if (*arg != '-')
3338 return 0;
3339 c = *++arg;
3340 if (!c)
3341 return 0;
3342 if (c == arg_short) {
3343 c = *++arg;
3344 if (!c)
3345 return 1;
3346 if (val && isdigit(c)) {
3347 char *end;
3348 int n = strtoul(arg, &end, 10);
3349 if (*end)
3350 return 0;
3351 *val = n;
3352 return 1;
3353 }
3354 return 0;
3355 }
3356 if (c != '-')
3357 return 0;
3358 arg++;
3359 eq = strchrnul(arg, '=');
3360 len = eq - arg;
3361 if (!len || strncmp(arg, arg_long, len))
3362 return 0;
3363 if (*eq) {
3364 int n;
3365 char *end;
3366 if (!isdigit(*++eq))
3367 return 0;
3368 n = strtoul(eq, &end, 10);
3369 if (*end)
3370 return 0;
3371 *val = n;
3372 }
3373 return 1;
3374 }
3375
3376 static int diff_scoreopt_parse(const char *opt);
3377
3378 static inline int short_opt(char opt, const char **argv,
3379 const char **optarg)
3380 {
3381 const char *arg = argv[0];
3382 if (arg[0] != '-' || arg[1] != opt)
3383 return 0;
3384 if (arg[2] != '\0') {
3385 *optarg = arg + 2;
3386 return 1;
3387 }
3388 if (!argv[1])
3389 die("Option '%c' requires a value", opt);
3390 *optarg = argv[1];
3391 return 2;
3392 }
3393
3394 int parse_long_opt(const char *opt, const char **argv,
3395 const char **optarg)
3396 {
3397 const char *arg = argv[0];
3398 if (!skip_prefix(arg, "--", &arg))
3399 return 0;
3400 if (!skip_prefix(arg, opt, &arg))
3401 return 0;
3402 if (*arg == '=') { /* stuck form: --option=value */
3403 *optarg = arg + 1;
3404 return 1;
3405 }
3406 if (*arg != '\0')
3407 return 0;
3408 /* separate form: --option value */
3409 if (!argv[1])
3410 die("Option '--%s' requires a value", opt);
3411 *optarg = argv[1];
3412 return 2;
3413 }
3414
3415 static int stat_opt(struct diff_options *options, const char **av)
3416 {
3417 const char *arg = av[0];
3418 char *end;
3419 int width = options->stat_width;
3420 int name_width = options->stat_name_width;
3421 int graph_width = options->stat_graph_width;
3422 int count = options->stat_count;
3423 int argcount = 1;
3424
3425 if (!skip_prefix(arg, "--stat", &arg))
3426 die("BUG: stat option does not begin with --stat: %s", arg);
3427 end = (char *)arg;
3428
3429 switch (*arg) {
3430 case '-':
3431 if (skip_prefix(arg, "-width", &arg)) {
3432 if (*arg == '=')
3433 width = strtoul(arg + 1, &end, 10);
3434 else if (!*arg && !av[1])
3435 die("Option '--stat-width' requires a value");
3436 else if (!*arg) {
3437 width = strtoul(av[1], &end, 10);
3438 argcount = 2;
3439 }
3440 } else if (skip_prefix(arg, "-name-width", &arg)) {
3441 if (*arg == '=')
3442 name_width = strtoul(arg + 1, &end, 10);
3443 else if (!*arg && !av[1])
3444 die("Option '--stat-name-width' requires a value");
3445 else if (!*arg) {
3446 name_width = strtoul(av[1], &end, 10);
3447 argcount = 2;
3448 }
3449 } else if (skip_prefix(arg, "-graph-width", &arg)) {
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 (skip_prefix(arg, "-count", &arg)) {
3459 if (*arg == '=')
3460 count = strtoul(arg + 1, &end, 10);
3461 else if (!*arg && !av[1])
3462 die("Option '--stat-count' requires a value");
3463 else if (!*arg) {
3464 count = strtoul(av[1], &end, 10);
3465 argcount = 2;
3466 }
3467 }
3468 break;
3469 case '=':
3470 width = strtoul(arg+1, &end, 10);
3471 if (*end == ',')
3472 name_width = strtoul(end+1, &end, 10);
3473 if (*end == ',')
3474 count = strtoul(end+1, &end, 10);
3475 }
3476
3477 /* Important! This checks all the error cases! */
3478 if (*end)
3479 return 0;
3480 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3481 options->stat_name_width = name_width;
3482 options->stat_graph_width = graph_width;
3483 options->stat_width = width;
3484 options->stat_count = count;
3485 return argcount;
3486 }
3487
3488 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3489 {
3490 struct strbuf errmsg = STRBUF_INIT;
3491 if (parse_dirstat_params(options, params, &errmsg))
3492 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3493 errmsg.buf);
3494 strbuf_release(&errmsg);
3495 /*
3496 * The caller knows a dirstat-related option is given from the command
3497 * line; allow it to say "return this_function();"
3498 */
3499 options->output_format |= DIFF_FORMAT_DIRSTAT;
3500 return 1;
3501 }
3502
3503 static int parse_submodule_opt(struct diff_options *options, const char *value)
3504 {
3505 if (parse_submodule_params(options, value))
3506 die(_("Failed to parse --submodule option parameter: '%s'"),
3507 value);
3508 return 1;
3509 }
3510
3511 static const char diff_status_letters[] = {
3512 DIFF_STATUS_ADDED,
3513 DIFF_STATUS_COPIED,
3514 DIFF_STATUS_DELETED,
3515 DIFF_STATUS_MODIFIED,
3516 DIFF_STATUS_RENAMED,
3517 DIFF_STATUS_TYPE_CHANGED,
3518 DIFF_STATUS_UNKNOWN,
3519 DIFF_STATUS_UNMERGED,
3520 DIFF_STATUS_FILTER_AON,
3521 DIFF_STATUS_FILTER_BROKEN,
3522 '\0',
3523 };
3524
3525 static unsigned int filter_bit['Z' + 1];
3526
3527 static void prepare_filter_bits(void)
3528 {
3529 int i;
3530
3531 if (!filter_bit[DIFF_STATUS_ADDED]) {
3532 for (i = 0; diff_status_letters[i]; i++)
3533 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3534 }
3535 }
3536
3537 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3538 {
3539 return opt->filter & filter_bit[(int) status];
3540 }
3541
3542 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3543 {
3544 int i, optch;
3545
3546 prepare_filter_bits();
3547
3548 /*
3549 * If there is a negation e.g. 'd' in the input, and we haven't
3550 * initialized the filter field with another --diff-filter, start
3551 * from full set of bits, except for AON.
3552 */
3553 if (!opt->filter) {
3554 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3555 if (optch < 'a' || 'z' < optch)
3556 continue;
3557 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3558 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3559 break;
3560 }
3561 }
3562
3563 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3564 unsigned int bit;
3565 int negate;
3566
3567 if ('a' <= optch && optch <= 'z') {
3568 negate = 1;
3569 optch = toupper(optch);
3570 } else {
3571 negate = 0;
3572 }
3573
3574 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3575 if (!bit)
3576 return optarg[i];
3577 if (negate)
3578 opt->filter &= ~bit;
3579 else
3580 opt->filter |= bit;
3581 }
3582 return 0;
3583 }
3584
3585 static void enable_patch_output(int *fmt) {
3586 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3587 *fmt |= DIFF_FORMAT_PATCH;
3588 }
3589
3590 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3591 {
3592 const char *arg = av[0];
3593 const char *optarg;
3594 int argcount;
3595
3596 /* Output format options */
3597 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3598 || opt_arg(arg, 'U', "unified", &options->context))
3599 enable_patch_output(&options->output_format);
3600 else if (!strcmp(arg, "--raw"))
3601 options->output_format |= DIFF_FORMAT_RAW;
3602 else if (!strcmp(arg, "--patch-with-raw")) {
3603 enable_patch_output(&options->output_format);
3604 options->output_format |= DIFF_FORMAT_RAW;
3605 } else if (!strcmp(arg, "--numstat"))
3606 options->output_format |= DIFF_FORMAT_NUMSTAT;
3607 else if (!strcmp(arg, "--shortstat"))
3608 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3609 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3610 return parse_dirstat_opt(options, "");
3611 else if (skip_prefix(arg, "-X", &arg))
3612 return parse_dirstat_opt(options, arg);
3613 else if (skip_prefix(arg, "--dirstat=", &arg))
3614 return parse_dirstat_opt(options, arg);
3615 else if (!strcmp(arg, "--cumulative"))
3616 return parse_dirstat_opt(options, "cumulative");
3617 else if (!strcmp(arg, "--dirstat-by-file"))
3618 return parse_dirstat_opt(options, "files");
3619 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
3620 parse_dirstat_opt(options, "files");
3621 return parse_dirstat_opt(options, arg);
3622 }
3623 else if (!strcmp(arg, "--check"))
3624 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3625 else if (!strcmp(arg, "--summary"))
3626 options->output_format |= DIFF_FORMAT_SUMMARY;
3627 else if (!strcmp(arg, "--patch-with-stat")) {
3628 enable_patch_output(&options->output_format);
3629 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3630 } else if (!strcmp(arg, "--name-only"))
3631 options->output_format |= DIFF_FORMAT_NAME;
3632 else if (!strcmp(arg, "--name-status"))
3633 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3634 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3635 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3636 else if (starts_with(arg, "--stat"))
3637 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3638 return stat_opt(options, av);
3639
3640 /* renames options */
3641 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3642 !strcmp(arg, "--break-rewrites")) {
3643 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3644 return error("invalid argument to -B: %s", arg+2);
3645 }
3646 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3647 !strcmp(arg, "--find-renames")) {
3648 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3649 return error("invalid argument to -M: %s", arg+2);
3650 options->detect_rename = DIFF_DETECT_RENAME;
3651 }
3652 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3653 options->irreversible_delete = 1;
3654 }
3655 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3656 !strcmp(arg, "--find-copies")) {
3657 if (options->detect_rename == DIFF_DETECT_COPY)
3658 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3659 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3660 return error("invalid argument to -C: %s", arg+2);
3661 options->detect_rename = DIFF_DETECT_COPY;
3662 }
3663 else if (!strcmp(arg, "--no-renames"))
3664 options->detect_rename = 0;
3665 else if (!strcmp(arg, "--rename-empty"))
3666 DIFF_OPT_SET(options, RENAME_EMPTY);
3667 else if (!strcmp(arg, "--no-rename-empty"))
3668 DIFF_OPT_CLR(options, RENAME_EMPTY);
3669 else if (!strcmp(arg, "--relative"))
3670 DIFF_OPT_SET(options, RELATIVE_NAME);
3671 else if (skip_prefix(arg, "--relative=", &arg)) {
3672 DIFF_OPT_SET(options, RELATIVE_NAME);
3673 options->prefix = arg;
3674 }
3675
3676 /* xdiff options */
3677 else if (!strcmp(arg, "--minimal"))
3678 DIFF_XDL_SET(options, NEED_MINIMAL);
3679 else if (!strcmp(arg, "--no-minimal"))
3680 DIFF_XDL_CLR(options, NEED_MINIMAL);
3681 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3682 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3683 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3684 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3685 else if (!strcmp(arg, "--ignore-space-at-eol"))
3686 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3687 else if (!strcmp(arg, "--ignore-blank-lines"))
3688 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3689 else if (!strcmp(arg, "--patience"))
3690 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3691 else if (!strcmp(arg, "--histogram"))
3692 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3693 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3694 long value = parse_algorithm_value(optarg);
3695 if (value < 0)
3696 return error("option diff-algorithm accepts \"myers\", "
3697 "\"minimal\", \"patience\" and \"histogram\"");
3698 /* clear out previous settings */
3699 DIFF_XDL_CLR(options, NEED_MINIMAL);
3700 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3701 options->xdl_opts |= value;
3702 return argcount;
3703 }
3704
3705 /* flags options */
3706 else if (!strcmp(arg, "--binary")) {
3707 enable_patch_output(&options->output_format);
3708 DIFF_OPT_SET(options, BINARY);
3709 }
3710 else if (!strcmp(arg, "--full-index"))
3711 DIFF_OPT_SET(options, FULL_INDEX);
3712 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3713 DIFF_OPT_SET(options, TEXT);
3714 else if (!strcmp(arg, "-R"))
3715 DIFF_OPT_SET(options, REVERSE_DIFF);
3716 else if (!strcmp(arg, "--find-copies-harder"))
3717 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3718 else if (!strcmp(arg, "--follow"))
3719 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3720 else if (!strcmp(arg, "--no-follow"))
3721 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3722 else if (!strcmp(arg, "--color"))
3723 options->use_color = 1;
3724 else if (skip_prefix(arg, "--color=", &arg)) {
3725 int value = git_config_colorbool(NULL, arg);
3726 if (value < 0)
3727 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3728 options->use_color = value;
3729 }
3730 else if (!strcmp(arg, "--no-color"))
3731 options->use_color = 0;
3732 else if (!strcmp(arg, "--color-words")) {
3733 options->use_color = 1;
3734 options->word_diff = DIFF_WORDS_COLOR;
3735 }
3736 else if (skip_prefix(arg, "--color-words=", &arg)) {
3737 options->use_color = 1;
3738 options->word_diff = DIFF_WORDS_COLOR;
3739 options->word_regex = arg;
3740 }
3741 else if (!strcmp(arg, "--word-diff")) {
3742 if (options->word_diff == DIFF_WORDS_NONE)
3743 options->word_diff = DIFF_WORDS_PLAIN;
3744 }
3745 else if (skip_prefix(arg, "--word-diff=", &arg)) {
3746 if (!strcmp(arg, "plain"))
3747 options->word_diff = DIFF_WORDS_PLAIN;
3748 else if (!strcmp(arg, "color")) {
3749 options->use_color = 1;
3750 options->word_diff = DIFF_WORDS_COLOR;
3751 }
3752 else if (!strcmp(arg, "porcelain"))
3753 options->word_diff = DIFF_WORDS_PORCELAIN;
3754 else if (!strcmp(arg, "none"))
3755 options->word_diff = DIFF_WORDS_NONE;
3756 else
3757 die("bad --word-diff argument: %s", arg);
3758 }
3759 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3760 if (options->word_diff == DIFF_WORDS_NONE)
3761 options->word_diff = DIFF_WORDS_PLAIN;
3762 options->word_regex = optarg;
3763 return argcount;
3764 }
3765 else if (!strcmp(arg, "--exit-code"))
3766 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3767 else if (!strcmp(arg, "--quiet"))
3768 DIFF_OPT_SET(options, QUICK);
3769 else if (!strcmp(arg, "--ext-diff"))
3770 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3771 else if (!strcmp(arg, "--no-ext-diff"))
3772 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3773 else if (!strcmp(arg, "--textconv"))
3774 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3775 else if (!strcmp(arg, "--no-textconv"))
3776 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3777 else if (!strcmp(arg, "--ignore-submodules")) {
3778 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3779 handle_ignore_submodules_arg(options, "all");
3780 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
3781 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3782 handle_ignore_submodules_arg(options, arg);
3783 } else if (!strcmp(arg, "--submodule"))
3784 DIFF_OPT_SET(options, SUBMODULE_LOG);
3785 else if (skip_prefix(arg, "--submodule=", &arg))
3786 return parse_submodule_opt(options, arg);
3787
3788 /* misc options */
3789 else if (!strcmp(arg, "-z"))
3790 options->line_termination = 0;
3791 else if ((argcount = short_opt('l', av, &optarg))) {
3792 options->rename_limit = strtoul(optarg, NULL, 10);
3793 return argcount;
3794 }
3795 else if ((argcount = short_opt('S', av, &optarg))) {
3796 options->pickaxe = optarg;
3797 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3798 return argcount;
3799 } else if ((argcount = short_opt('G', av, &optarg))) {
3800 options->pickaxe = optarg;
3801 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3802 return argcount;
3803 }
3804 else if (!strcmp(arg, "--pickaxe-all"))
3805 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3806 else if (!strcmp(arg, "--pickaxe-regex"))
3807 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3808 else if ((argcount = short_opt('O', av, &optarg))) {
3809 options->orderfile = optarg;
3810 return argcount;
3811 }
3812 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3813 int offending = parse_diff_filter_opt(optarg, options);
3814 if (offending)
3815 die("unknown change class '%c' in --diff-filter=%s",
3816 offending, optarg);
3817 return argcount;
3818 }
3819 else if (!strcmp(arg, "--abbrev"))
3820 options->abbrev = DEFAULT_ABBREV;
3821 else if (skip_prefix(arg, "--abbrev=", &arg)) {
3822 options->abbrev = strtoul(arg, NULL, 10);
3823 if (options->abbrev < MINIMUM_ABBREV)
3824 options->abbrev = MINIMUM_ABBREV;
3825 else if (40 < options->abbrev)
3826 options->abbrev = 40;
3827 }
3828 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3829 options->a_prefix = optarg;
3830 return argcount;
3831 }
3832 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3833 options->b_prefix = optarg;
3834 return argcount;
3835 }
3836 else if (!strcmp(arg, "--no-prefix"))
3837 options->a_prefix = options->b_prefix = "";
3838 else if (opt_arg(arg, '\0', "inter-hunk-context",
3839 &options->interhunkcontext))
3840 ;
3841 else if (!strcmp(arg, "-W"))
3842 DIFF_OPT_SET(options, FUNCCONTEXT);
3843 else if (!strcmp(arg, "--function-context"))
3844 DIFF_OPT_SET(options, FUNCCONTEXT);
3845 else if (!strcmp(arg, "--no-function-context"))
3846 DIFF_OPT_CLR(options, FUNCCONTEXT);
3847 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3848 options->file = fopen(optarg, "w");
3849 if (!options->file)
3850 die_errno("Could not open '%s'", optarg);
3851 options->close_file = 1;
3852 return argcount;
3853 } else
3854 return 0;
3855 return 1;
3856 }
3857
3858 int parse_rename_score(const char **cp_p)
3859 {
3860 unsigned long num, scale;
3861 int ch, dot;
3862 const char *cp = *cp_p;
3863
3864 num = 0;
3865 scale = 1;
3866 dot = 0;
3867 for (;;) {
3868 ch = *cp;
3869 if ( !dot && ch == '.' ) {
3870 scale = 1;
3871 dot = 1;
3872 } else if ( ch == '%' ) {
3873 scale = dot ? scale*100 : 100;
3874 cp++; /* % is always at the end */
3875 break;
3876 } else if ( ch >= '0' && ch <= '9' ) {
3877 if ( scale < 100000 ) {
3878 scale *= 10;
3879 num = (num*10) + (ch-'0');
3880 }
3881 } else {
3882 break;
3883 }
3884 cp++;
3885 }
3886 *cp_p = cp;
3887
3888 /* user says num divided by scale and we say internally that
3889 * is MAX_SCORE * num / scale.
3890 */
3891 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3892 }
3893
3894 static int diff_scoreopt_parse(const char *opt)
3895 {
3896 int opt1, opt2, cmd;
3897
3898 if (*opt++ != '-')
3899 return -1;
3900 cmd = *opt++;
3901 if (cmd == '-') {
3902 /* convert the long-form arguments into short-form versions */
3903 if (skip_prefix(opt, "break-rewrites", &opt)) {
3904 if (*opt == 0 || *opt++ == '=')
3905 cmd = 'B';
3906 } else if (skip_prefix(opt, "find-copies", &opt)) {
3907 if (*opt == 0 || *opt++ == '=')
3908 cmd = 'C';
3909 } else if (skip_prefix(opt, "find-renames", &opt)) {
3910 if (*opt == 0 || *opt++ == '=')
3911 cmd = 'M';
3912 }
3913 }
3914 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3915 return -1; /* that is not a -M, -C, or -B option */
3916
3917 opt1 = parse_rename_score(&opt);
3918 if (cmd != 'B')
3919 opt2 = 0;
3920 else {
3921 if (*opt == 0)
3922 opt2 = 0;
3923 else if (*opt != '/')
3924 return -1; /* we expect -B80/99 or -B80 */
3925 else {
3926 opt++;
3927 opt2 = parse_rename_score(&opt);
3928 }
3929 }
3930 if (*opt != 0)
3931 return -1;
3932 return opt1 | (opt2 << 16);
3933 }
3934
3935 struct diff_queue_struct diff_queued_diff;
3936
3937 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3938 {
3939 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
3940 queue->queue[queue->nr++] = dp;
3941 }
3942
3943 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3944 struct diff_filespec *one,
3945 struct diff_filespec *two)
3946 {
3947 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3948 dp->one = one;
3949 dp->two = two;
3950 if (queue)
3951 diff_q(queue, dp);
3952 return dp;
3953 }
3954
3955 void diff_free_filepair(struct diff_filepair *p)
3956 {
3957 free_filespec(p->one);
3958 free_filespec(p->two);
3959 free(p);
3960 }
3961
3962 /* This is different from find_unique_abbrev() in that
3963 * it stuffs the result with dots for alignment.
3964 */
3965 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3966 {
3967 int abblen;
3968 const char *abbrev;
3969 if (len == 40)
3970 return sha1_to_hex(sha1);
3971
3972 abbrev = find_unique_abbrev(sha1, len);
3973 abblen = strlen(abbrev);
3974 if (abblen < 37) {
3975 static char hex[41];
3976 if (len < abblen && abblen <= len + 2)
3977 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3978 else
3979 sprintf(hex, "%s...", abbrev);
3980 return hex;
3981 }
3982 return sha1_to_hex(sha1);
3983 }
3984
3985 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3986 {
3987 int line_termination = opt->line_termination;
3988 int inter_name_termination = line_termination ? '\t' : '\0';
3989
3990 fprintf(opt->file, "%s", diff_line_prefix(opt));
3991 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3992 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3993 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3994 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3995 }
3996 if (p->score) {
3997 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3998 inter_name_termination);
3999 } else {
4000 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4001 }
4002
4003 if (p->status == DIFF_STATUS_COPIED ||
4004 p->status == DIFF_STATUS_RENAMED) {
4005 const char *name_a, *name_b;
4006 name_a = p->one->path;
4007 name_b = p->two->path;
4008 strip_prefix(opt->prefix_length, &name_a, &name_b);
4009 write_name_quoted(name_a, opt->file, inter_name_termination);
4010 write_name_quoted(name_b, opt->file, line_termination);
4011 } else {
4012 const char *name_a, *name_b;
4013 name_a = p->one->mode ? p->one->path : p->two->path;
4014 name_b = NULL;
4015 strip_prefix(opt->prefix_length, &name_a, &name_b);
4016 write_name_quoted(name_a, opt->file, line_termination);
4017 }
4018 }
4019
4020 int diff_unmodified_pair(struct diff_filepair *p)
4021 {
4022 /* This function is written stricter than necessary to support
4023 * the currently implemented transformers, but the idea is to
4024 * let transformers to produce diff_filepairs any way they want,
4025 * and filter and clean them up here before producing the output.
4026 */
4027 struct diff_filespec *one = p->one, *two = p->two;
4028
4029 if (DIFF_PAIR_UNMERGED(p))
4030 return 0; /* unmerged is interesting */
4031
4032 /* deletion, addition, mode or type change
4033 * and rename are all interesting.
4034 */
4035 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4036 DIFF_PAIR_MODE_CHANGED(p) ||
4037 strcmp(one->path, two->path))
4038 return 0;
4039
4040 /* both are valid and point at the same path. that is, we are
4041 * dealing with a change.
4042 */
4043 if (one->sha1_valid && two->sha1_valid &&
4044 !hashcmp(one->sha1, two->sha1) &&
4045 !one->dirty_submodule && !two->dirty_submodule)
4046 return 1; /* no change */
4047 if (!one->sha1_valid && !two->sha1_valid)
4048 return 1; /* both look at the same file on the filesystem. */
4049 return 0;
4050 }
4051
4052 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4053 {
4054 if (diff_unmodified_pair(p))
4055 return;
4056
4057 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4058 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4059 return; /* no tree diffs in patch format */
4060
4061 run_diff(p, o);
4062 }
4063
4064 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4065 struct diffstat_t *diffstat)
4066 {
4067 if (diff_unmodified_pair(p))
4068 return;
4069
4070 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4071 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4072 return; /* no useful stat for tree diffs */
4073
4074 run_diffstat(p, o, diffstat);
4075 }
4076
4077 static void diff_flush_checkdiff(struct diff_filepair *p,
4078 struct diff_options *o)
4079 {
4080 if (diff_unmodified_pair(p))
4081 return;
4082
4083 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4084 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4085 return; /* nothing to check in tree diffs */
4086
4087 run_checkdiff(p, o);
4088 }
4089
4090 int diff_queue_is_empty(void)
4091 {
4092 struct diff_queue_struct *q = &diff_queued_diff;
4093 int i;
4094 for (i = 0; i < q->nr; i++)
4095 if (!diff_unmodified_pair(q->queue[i]))
4096 return 0;
4097 return 1;
4098 }
4099
4100 #if DIFF_DEBUG
4101 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4102 {
4103 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4104 x, one ? one : "",
4105 s->path,
4106 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4107 s->mode,
4108 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4109 fprintf(stderr, "queue[%d] %s size %lu\n",
4110 x, one ? one : "",
4111 s->size);
4112 }
4113
4114 void diff_debug_filepair(const struct diff_filepair *p, int i)
4115 {
4116 diff_debug_filespec(p->one, i, "one");
4117 diff_debug_filespec(p->two, i, "two");
4118 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4119 p->score, p->status ? p->status : '?',
4120 p->one->rename_used, p->broken_pair);
4121 }
4122
4123 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4124 {
4125 int i;
4126 if (msg)
4127 fprintf(stderr, "%s\n", msg);
4128 fprintf(stderr, "q->nr = %d\n", q->nr);
4129 for (i = 0; i < q->nr; i++) {
4130 struct diff_filepair *p = q->queue[i];
4131 diff_debug_filepair(p, i);
4132 }
4133 }
4134 #endif
4135
4136 static void diff_resolve_rename_copy(void)
4137 {
4138 int i;
4139 struct diff_filepair *p;
4140 struct diff_queue_struct *q = &diff_queued_diff;
4141
4142 diff_debug_queue("resolve-rename-copy", q);
4143
4144 for (i = 0; i < q->nr; i++) {
4145 p = q->queue[i];
4146 p->status = 0; /* undecided */
4147 if (DIFF_PAIR_UNMERGED(p))
4148 p->status = DIFF_STATUS_UNMERGED;
4149 else if (!DIFF_FILE_VALID(p->one))
4150 p->status = DIFF_STATUS_ADDED;
4151 else if (!DIFF_FILE_VALID(p->two))
4152 p->status = DIFF_STATUS_DELETED;
4153 else if (DIFF_PAIR_TYPE_CHANGED(p))
4154 p->status = DIFF_STATUS_TYPE_CHANGED;
4155
4156 /* from this point on, we are dealing with a pair
4157 * whose both sides are valid and of the same type, i.e.
4158 * either in-place edit or rename/copy edit.
4159 */
4160 else if (DIFF_PAIR_RENAME(p)) {
4161 /*
4162 * A rename might have re-connected a broken
4163 * pair up, causing the pathnames to be the
4164 * same again. If so, that's not a rename at
4165 * all, just a modification..
4166 *
4167 * Otherwise, see if this source was used for
4168 * multiple renames, in which case we decrement
4169 * the count, and call it a copy.
4170 */
4171 if (!strcmp(p->one->path, p->two->path))
4172 p->status = DIFF_STATUS_MODIFIED;
4173 else if (--p->one->rename_used > 0)
4174 p->status = DIFF_STATUS_COPIED;
4175 else
4176 p->status = DIFF_STATUS_RENAMED;
4177 }
4178 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4179 p->one->mode != p->two->mode ||
4180 p->one->dirty_submodule ||
4181 p->two->dirty_submodule ||
4182 is_null_sha1(p->one->sha1))
4183 p->status = DIFF_STATUS_MODIFIED;
4184 else {
4185 /* This is a "no-change" entry and should not
4186 * happen anymore, but prepare for broken callers.
4187 */
4188 error("feeding unmodified %s to diffcore",
4189 p->one->path);
4190 p->status = DIFF_STATUS_UNKNOWN;
4191 }
4192 }
4193 diff_debug_queue("resolve-rename-copy done", q);
4194 }
4195
4196 static int check_pair_status(struct diff_filepair *p)
4197 {
4198 switch (p->status) {
4199 case DIFF_STATUS_UNKNOWN:
4200 return 0;
4201 case 0:
4202 die("internal error in diff-resolve-rename-copy");
4203 default:
4204 return 1;
4205 }
4206 }
4207
4208 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4209 {
4210 int fmt = opt->output_format;
4211
4212 if (fmt & DIFF_FORMAT_CHECKDIFF)
4213 diff_flush_checkdiff(p, opt);
4214 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4215 diff_flush_raw(p, opt);
4216 else if (fmt & DIFF_FORMAT_NAME) {
4217 const char *name_a, *name_b;
4218 name_a = p->two->path;
4219 name_b = NULL;
4220 strip_prefix(opt->prefix_length, &name_a, &name_b);
4221 write_name_quoted(name_a, opt->file, opt->line_termination);
4222 }
4223 }
4224
4225 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4226 {
4227 if (fs->mode)
4228 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4229 else
4230 fprintf(file, " %s ", newdelete);
4231 write_name_quoted(fs->path, file, '\n');
4232 }
4233
4234
4235 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4236 const char *line_prefix)
4237 {
4238 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4239 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4240 p->two->mode, show_name ? ' ' : '\n');
4241 if (show_name) {
4242 write_name_quoted(p->two->path, file, '\n');
4243 }
4244 }
4245 }
4246
4247 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4248 const char *line_prefix)
4249 {
4250 char *names = pprint_rename(p->one->path, p->two->path);
4251
4252 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4253 free(names);
4254 show_mode_change(file, p, 0, line_prefix);
4255 }
4256
4257 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4258 {
4259 FILE *file = opt->file;
4260 const char *line_prefix = diff_line_prefix(opt);
4261
4262 switch(p->status) {
4263 case DIFF_STATUS_DELETED:
4264 fputs(line_prefix, file);
4265 show_file_mode_name(file, "delete", p->one);
4266 break;
4267 case DIFF_STATUS_ADDED:
4268 fputs(line_prefix, file);
4269 show_file_mode_name(file, "create", p->two);
4270 break;
4271 case DIFF_STATUS_COPIED:
4272 fputs(line_prefix, file);
4273 show_rename_copy(file, "copy", p, line_prefix);
4274 break;
4275 case DIFF_STATUS_RENAMED:
4276 fputs(line_prefix, file);
4277 show_rename_copy(file, "rename", p, line_prefix);
4278 break;
4279 default:
4280 if (p->score) {
4281 fprintf(file, "%s rewrite ", line_prefix);
4282 write_name_quoted(p->two->path, file, ' ');
4283 fprintf(file, "(%d%%)\n", similarity_index(p));
4284 }
4285 show_mode_change(file, p, !p->score, line_prefix);
4286 break;
4287 }
4288 }
4289
4290 struct patch_id_t {
4291 git_SHA_CTX *ctx;
4292 int patchlen;
4293 };
4294
4295 static int remove_space(char *line, int len)
4296 {
4297 int i;
4298 char *dst = line;
4299 unsigned char c;
4300
4301 for (i = 0; i < len; i++)
4302 if (!isspace((c = line[i])))
4303 *dst++ = c;
4304
4305 return dst - line;
4306 }
4307
4308 static void patch_id_consume(void *priv, char *line, unsigned long len)
4309 {
4310 struct patch_id_t *data = priv;
4311 int new_len;
4312
4313 /* Ignore line numbers when computing the SHA1 of the patch */
4314 if (starts_with(line, "@@ -"))
4315 return;
4316
4317 new_len = remove_space(line, len);
4318
4319 git_SHA1_Update(data->ctx, line, new_len);
4320 data->patchlen += new_len;
4321 }
4322
4323 /* returns 0 upon success, and writes result into sha1 */
4324 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4325 {
4326 struct diff_queue_struct *q = &diff_queued_diff;
4327 int i;
4328 git_SHA_CTX ctx;
4329 struct patch_id_t data;
4330 char buffer[PATH_MAX * 4 + 20];
4331
4332 git_SHA1_Init(&ctx);
4333 memset(&data, 0, sizeof(struct patch_id_t));
4334 data.ctx = &ctx;
4335
4336 for (i = 0; i < q->nr; i++) {
4337 xpparam_t xpp;
4338 xdemitconf_t xecfg;
4339 mmfile_t mf1, mf2;
4340 struct diff_filepair *p = q->queue[i];
4341 int len1, len2;
4342
4343 memset(&xpp, 0, sizeof(xpp));
4344 memset(&xecfg, 0, sizeof(xecfg));
4345 if (p->status == 0)
4346 return error("internal diff status error");
4347 if (p->status == DIFF_STATUS_UNKNOWN)
4348 continue;
4349 if (diff_unmodified_pair(p))
4350 continue;
4351 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4352 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4353 continue;
4354 if (DIFF_PAIR_UNMERGED(p))
4355 continue;
4356
4357 diff_fill_sha1_info(p->one);
4358 diff_fill_sha1_info(p->two);
4359 if (fill_mmfile(&mf1, p->one) < 0 ||
4360 fill_mmfile(&mf2, p->two) < 0)
4361 return error("unable to read files to diff");
4362
4363 len1 = remove_space(p->one->path, strlen(p->one->path));
4364 len2 = remove_space(p->two->path, strlen(p->two->path));
4365 if (p->one->mode == 0)
4366 len1 = snprintf(buffer, sizeof(buffer),
4367 "diff--gita/%.*sb/%.*s"
4368 "newfilemode%06o"
4369 "---/dev/null"
4370 "+++b/%.*s",
4371 len1, p->one->path,
4372 len2, p->two->path,
4373 p->two->mode,
4374 len2, p->two->path);
4375 else if (p->two->mode == 0)
4376 len1 = snprintf(buffer, sizeof(buffer),
4377 "diff--gita/%.*sb/%.*s"
4378 "deletedfilemode%06o"
4379 "---a/%.*s"
4380 "+++/dev/null",
4381 len1, p->one->path,
4382 len2, p->two->path,
4383 p->one->mode,
4384 len1, p->one->path);
4385 else
4386 len1 = snprintf(buffer, sizeof(buffer),
4387 "diff--gita/%.*sb/%.*s"
4388 "---a/%.*s"
4389 "+++b/%.*s",
4390 len1, p->one->path,
4391 len2, p->two->path,
4392 len1, p->one->path,
4393 len2, p->two->path);
4394 git_SHA1_Update(&ctx, buffer, len1);
4395
4396 if (diff_filespec_is_binary(p->one) ||
4397 diff_filespec_is_binary(p->two)) {
4398 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4399 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4400 continue;
4401 }
4402
4403 xpp.flags = 0;
4404 xecfg.ctxlen = 3;
4405 xecfg.flags = 0;
4406 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4407 &xpp, &xecfg);
4408 }
4409
4410 git_SHA1_Final(sha1, &ctx);
4411 return 0;
4412 }
4413
4414 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4415 {
4416 struct diff_queue_struct *q = &diff_queued_diff;
4417 int i;
4418 int result = diff_get_patch_id(options, sha1);
4419
4420 for (i = 0; i < q->nr; i++)
4421 diff_free_filepair(q->queue[i]);
4422
4423 free(q->queue);
4424 DIFF_QUEUE_CLEAR(q);
4425
4426 return result;
4427 }
4428
4429 static int is_summary_empty(const struct diff_queue_struct *q)
4430 {
4431 int i;
4432
4433 for (i = 0; i < q->nr; i++) {
4434 const struct diff_filepair *p = q->queue[i];
4435
4436 switch (p->status) {
4437 case DIFF_STATUS_DELETED:
4438 case DIFF_STATUS_ADDED:
4439 case DIFF_STATUS_COPIED:
4440 case DIFF_STATUS_RENAMED:
4441 return 0;
4442 default:
4443 if (p->score)
4444 return 0;
4445 if (p->one->mode && p->two->mode &&
4446 p->one->mode != p->two->mode)
4447 return 0;
4448 break;
4449 }
4450 }
4451 return 1;
4452 }
4453
4454 static const char rename_limit_warning[] =
4455 "inexact rename detection was skipped due to too many files.";
4456
4457 static const char degrade_cc_to_c_warning[] =
4458 "only found copies from modified paths due to too many files.";
4459
4460 static const char rename_limit_advice[] =
4461 "you may want to set your %s variable to at least "
4462 "%d and retry the command.";
4463
4464 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4465 {
4466 if (degraded_cc)
4467 warning(degrade_cc_to_c_warning);
4468 else if (needed)
4469 warning(rename_limit_warning);
4470 else
4471 return;
4472 if (0 < needed && needed < 32767)
4473 warning(rename_limit_advice, varname, needed);
4474 }
4475
4476 void diff_flush(struct diff_options *options)
4477 {
4478 struct diff_queue_struct *q = &diff_queued_diff;
4479 int i, output_format = options->output_format;
4480 int separator = 0;
4481 int dirstat_by_line = 0;
4482
4483 /*
4484 * Order: raw, stat, summary, patch
4485 * or: name/name-status/checkdiff (other bits clear)
4486 */
4487 if (!q->nr)
4488 goto free_queue;
4489
4490 if (output_format & (DIFF_FORMAT_RAW |
4491 DIFF_FORMAT_NAME |
4492 DIFF_FORMAT_NAME_STATUS |
4493 DIFF_FORMAT_CHECKDIFF)) {
4494 for (i = 0; i < q->nr; i++) {
4495 struct diff_filepair *p = q->queue[i];
4496 if (check_pair_status(p))
4497 flush_one_pair(p, options);
4498 }
4499 separator++;
4500 }
4501
4502 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4503 dirstat_by_line = 1;
4504
4505 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4506 dirstat_by_line) {
4507 struct diffstat_t diffstat;
4508
4509 memset(&diffstat, 0, sizeof(struct diffstat_t));
4510 for (i = 0; i < q->nr; i++) {
4511 struct diff_filepair *p = q->queue[i];
4512 if (check_pair_status(p))
4513 diff_flush_stat(p, options, &diffstat);
4514 }
4515 if (output_format & DIFF_FORMAT_NUMSTAT)
4516 show_numstat(&diffstat, options);
4517 if (output_format & DIFF_FORMAT_DIFFSTAT)
4518 show_stats(&diffstat, options);
4519 if (output_format & DIFF_FORMAT_SHORTSTAT)
4520 show_shortstats(&diffstat, options);
4521 if (output_format & DIFF_FORMAT_DIRSTAT)
4522 show_dirstat_by_line(&diffstat, options);
4523 free_diffstat_info(&diffstat);
4524 separator++;
4525 }
4526 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4527 show_dirstat(options);
4528
4529 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4530 for (i = 0; i < q->nr; i++) {
4531 diff_summary(options, q->queue[i]);
4532 }
4533 separator++;
4534 }
4535
4536 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4537 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4538 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4539 /*
4540 * run diff_flush_patch for the exit status. setting
4541 * options->file to /dev/null should be safe, because we
4542 * aren't supposed to produce any output anyway.
4543 */
4544 if (options->close_file)
4545 fclose(options->file);
4546 options->file = fopen("/dev/null", "w");
4547 if (!options->file)
4548 die_errno("Could not open /dev/null");
4549 options->close_file = 1;
4550 for (i = 0; i < q->nr; i++) {
4551 struct diff_filepair *p = q->queue[i];
4552 if (check_pair_status(p))
4553 diff_flush_patch(p, options);
4554 if (options->found_changes)
4555 break;
4556 }
4557 }
4558
4559 if (output_format & DIFF_FORMAT_PATCH) {
4560 if (separator) {
4561 fprintf(options->file, "%s%c",
4562 diff_line_prefix(options),
4563 options->line_termination);
4564 if (options->stat_sep) {
4565 /* attach patch instead of inline */
4566 fputs(options->stat_sep, options->file);
4567 }
4568 }
4569
4570 for (i = 0; i < q->nr; i++) {
4571 struct diff_filepair *p = q->queue[i];
4572 if (check_pair_status(p))
4573 diff_flush_patch(p, options);
4574 }
4575 }
4576
4577 if (output_format & DIFF_FORMAT_CALLBACK)
4578 options->format_callback(q, options, options->format_callback_data);
4579
4580 for (i = 0; i < q->nr; i++)
4581 diff_free_filepair(q->queue[i]);
4582 free_queue:
4583 free(q->queue);
4584 DIFF_QUEUE_CLEAR(q);
4585 if (options->close_file)
4586 fclose(options->file);
4587
4588 /*
4589 * Report the content-level differences with HAS_CHANGES;
4590 * diff_addremove/diff_change does not set the bit when
4591 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4592 */
4593 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4594 if (options->found_changes)
4595 DIFF_OPT_SET(options, HAS_CHANGES);
4596 else
4597 DIFF_OPT_CLR(options, HAS_CHANGES);
4598 }
4599 }
4600
4601 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4602 {
4603 return (((p->status == DIFF_STATUS_MODIFIED) &&
4604 ((p->score &&
4605 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4606 (!p->score &&
4607 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4608 ((p->status != DIFF_STATUS_MODIFIED) &&
4609 filter_bit_tst(p->status, options)));
4610 }
4611
4612 static void diffcore_apply_filter(struct diff_options *options)
4613 {
4614 int i;
4615 struct diff_queue_struct *q = &diff_queued_diff;
4616 struct diff_queue_struct outq;
4617
4618 DIFF_QUEUE_CLEAR(&outq);
4619
4620 if (!options->filter)
4621 return;
4622
4623 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4624 int found;
4625 for (i = found = 0; !found && i < q->nr; i++) {
4626 if (match_filter(options, q->queue[i]))
4627 found++;
4628 }
4629 if (found)
4630 return;
4631
4632 /* otherwise we will clear the whole queue
4633 * by copying the empty outq at the end of this
4634 * function, but first clear the current entries
4635 * in the queue.
4636 */
4637 for (i = 0; i < q->nr; i++)
4638 diff_free_filepair(q->queue[i]);
4639 }
4640 else {
4641 /* Only the matching ones */
4642 for (i = 0; i < q->nr; i++) {
4643 struct diff_filepair *p = q->queue[i];
4644 if (match_filter(options, p))
4645 diff_q(&outq, p);
4646 else
4647 diff_free_filepair(p);
4648 }
4649 }
4650 free(q->queue);
4651 *q = outq;
4652 }
4653
4654 /* Check whether two filespecs with the same mode and size are identical */
4655 static int diff_filespec_is_identical(struct diff_filespec *one,
4656 struct diff_filespec *two)
4657 {
4658 if (S_ISGITLINK(one->mode))
4659 return 0;
4660 if (diff_populate_filespec(one, 0))
4661 return 0;
4662 if (diff_populate_filespec(two, 0))
4663 return 0;
4664 return !memcmp(one->data, two->data, one->size);
4665 }
4666
4667 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4668 {
4669 if (p->done_skip_stat_unmatch)
4670 return p->skip_stat_unmatch_result;
4671
4672 p->done_skip_stat_unmatch = 1;
4673 p->skip_stat_unmatch_result = 0;
4674 /*
4675 * 1. Entries that come from stat info dirtiness
4676 * always have both sides (iow, not create/delete),
4677 * one side of the object name is unknown, with
4678 * the same mode and size. Keep the ones that
4679 * do not match these criteria. They have real
4680 * differences.
4681 *
4682 * 2. At this point, the file is known to be modified,
4683 * with the same mode and size, and the object
4684 * name of one side is unknown. Need to inspect
4685 * the identical contents.
4686 */
4687 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4688 !DIFF_FILE_VALID(p->two) ||
4689 (p->one->sha1_valid && p->two->sha1_valid) ||
4690 (p->one->mode != p->two->mode) ||
4691 diff_populate_filespec(p->one, 1) ||
4692 diff_populate_filespec(p->two, 1) ||
4693 (p->one->size != p->two->size) ||
4694 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4695 p->skip_stat_unmatch_result = 1;
4696 return p->skip_stat_unmatch_result;
4697 }
4698
4699 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4700 {
4701 int i;
4702 struct diff_queue_struct *q = &diff_queued_diff;
4703 struct diff_queue_struct outq;
4704 DIFF_QUEUE_CLEAR(&outq);
4705
4706 for (i = 0; i < q->nr; i++) {
4707 struct diff_filepair *p = q->queue[i];
4708
4709 if (diff_filespec_check_stat_unmatch(p))
4710 diff_q(&outq, p);
4711 else {
4712 /*
4713 * The caller can subtract 1 from skip_stat_unmatch
4714 * to determine how many paths were dirty only
4715 * due to stat info mismatch.
4716 */
4717 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4718 diffopt->skip_stat_unmatch++;
4719 diff_free_filepair(p);
4720 }
4721 }
4722 free(q->queue);
4723 *q = outq;
4724 }
4725
4726 static int diffnamecmp(const void *a_, const void *b_)
4727 {
4728 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4729 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4730 const char *name_a, *name_b;
4731
4732 name_a = a->one ? a->one->path : a->two->path;
4733 name_b = b->one ? b->one->path : b->two->path;
4734 return strcmp(name_a, name_b);
4735 }
4736
4737 void diffcore_fix_diff_index(struct diff_options *options)
4738 {
4739 struct diff_queue_struct *q = &diff_queued_diff;
4740 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4741 }
4742
4743 void diffcore_std(struct diff_options *options)
4744 {
4745 /* NOTE please keep the following in sync with diff_tree_combined() */
4746 if (options->skip_stat_unmatch)
4747 diffcore_skip_stat_unmatch(options);
4748 if (!options->found_follow) {
4749 /* See try_to_follow_renames() in tree-diff.c */
4750 if (options->break_opt != -1)
4751 diffcore_break(options->break_opt);
4752 if (options->detect_rename)
4753 diffcore_rename(options);
4754 if (options->break_opt != -1)
4755 diffcore_merge_broken();
4756 }
4757 if (options->pickaxe)
4758 diffcore_pickaxe(options);
4759 if (options->orderfile)
4760 diffcore_order(options->orderfile);
4761 if (!options->found_follow)
4762 /* See try_to_follow_renames() in tree-diff.c */
4763 diff_resolve_rename_copy();
4764 diffcore_apply_filter(options);
4765
4766 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4767 DIFF_OPT_SET(options, HAS_CHANGES);
4768 else
4769 DIFF_OPT_CLR(options, HAS_CHANGES);
4770
4771 options->found_follow = 0;
4772 }
4773
4774 int diff_result_code(struct diff_options *opt, int status)
4775 {
4776 int result = 0;
4777
4778 diff_warn_rename_limit("diff.renameLimit",
4779 opt->needed_rename_limit,
4780 opt->degraded_cc_to_c);
4781 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4782 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4783 return status;
4784 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4785 DIFF_OPT_TST(opt, HAS_CHANGES))
4786 result |= 01;
4787 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4788 DIFF_OPT_TST(opt, CHECK_FAILED))
4789 result |= 02;
4790 return result;
4791 }
4792
4793 int diff_can_quit_early(struct diff_options *opt)
4794 {
4795 return (DIFF_OPT_TST(opt, QUICK) &&
4796 !opt->filter &&
4797 DIFF_OPT_TST(opt, HAS_CHANGES));
4798 }
4799
4800 /*
4801 * Shall changes to this submodule be ignored?
4802 *
4803 * Submodule changes can be configured to be ignored separately for each path,
4804 * but that configuration can be overridden from the command line.
4805 */
4806 static int is_submodule_ignored(const char *path, struct diff_options *options)
4807 {
4808 int ignored = 0;
4809 unsigned orig_flags = options->flags;
4810 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4811 set_diffopt_flags_from_submodule_config(options, path);
4812 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4813 ignored = 1;
4814 options->flags = orig_flags;
4815 return ignored;
4816 }
4817
4818 void diff_addremove(struct diff_options *options,
4819 int addremove, unsigned mode,
4820 const unsigned char *sha1,
4821 int sha1_valid,
4822 const char *concatpath, unsigned dirty_submodule)
4823 {
4824 struct diff_filespec *one, *two;
4825
4826 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4827 return;
4828
4829 /* This may look odd, but it is a preparation for
4830 * feeding "there are unchanged files which should
4831 * not produce diffs, but when you are doing copy
4832 * detection you would need them, so here they are"
4833 * entries to the diff-core. They will be prefixed
4834 * with something like '=' or '*' (I haven't decided
4835 * which but should not make any difference).
4836 * Feeding the same new and old to diff_change()
4837 * also has the same effect.
4838 * Before the final output happens, they are pruned after
4839 * merged into rename/copy pairs as appropriate.
4840 */
4841 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4842 addremove = (addremove == '+' ? '-' :
4843 addremove == '-' ? '+' : addremove);
4844
4845 if (options->prefix &&
4846 strncmp(concatpath, options->prefix, options->prefix_length))
4847 return;
4848
4849 one = alloc_filespec(concatpath);
4850 two = alloc_filespec(concatpath);
4851
4852 if (addremove != '+')
4853 fill_filespec(one, sha1, sha1_valid, mode);
4854 if (addremove != '-') {
4855 fill_filespec(two, sha1, sha1_valid, mode);
4856 two->dirty_submodule = dirty_submodule;
4857 }
4858
4859 diff_queue(&diff_queued_diff, one, two);
4860 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4861 DIFF_OPT_SET(options, HAS_CHANGES);
4862 }
4863
4864 void diff_change(struct diff_options *options,
4865 unsigned old_mode, unsigned new_mode,
4866 const unsigned char *old_sha1,
4867 const unsigned char *new_sha1,
4868 int old_sha1_valid, int new_sha1_valid,
4869 const char *concatpath,
4870 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4871 {
4872 struct diff_filespec *one, *two;
4873 struct diff_filepair *p;
4874
4875 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4876 is_submodule_ignored(concatpath, options))
4877 return;
4878
4879 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4880 unsigned tmp;
4881 const unsigned char *tmp_c;
4882 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4883 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4884 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4885 new_sha1_valid = tmp;
4886 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4887 new_dirty_submodule = tmp;
4888 }
4889
4890 if (options->prefix &&
4891 strncmp(concatpath, options->prefix, options->prefix_length))
4892 return;
4893
4894 one = alloc_filespec(concatpath);
4895 two = alloc_filespec(concatpath);
4896 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4897 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4898 one->dirty_submodule = old_dirty_submodule;
4899 two->dirty_submodule = new_dirty_submodule;
4900 p = diff_queue(&diff_queued_diff, one, two);
4901
4902 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4903 return;
4904
4905 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
4906 !diff_filespec_check_stat_unmatch(p))
4907 return;
4908
4909 DIFF_OPT_SET(options, HAS_CHANGES);
4910 }
4911
4912 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4913 {
4914 struct diff_filepair *pair;
4915 struct diff_filespec *one, *two;
4916
4917 if (options->prefix &&
4918 strncmp(path, options->prefix, options->prefix_length))
4919 return NULL;
4920
4921 one = alloc_filespec(path);
4922 two = alloc_filespec(path);
4923 pair = diff_queue(&diff_queued_diff, one, two);
4924 pair->is_unmerged = 1;
4925 return pair;
4926 }
4927
4928 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4929 size_t *outsize)
4930 {
4931 struct diff_tempfile *temp;
4932 const char *argv[3];
4933 const char **arg = argv;
4934 struct child_process child;
4935 struct strbuf buf = STRBUF_INIT;
4936 int err = 0;
4937
4938 temp = prepare_temp_file(spec->path, spec);
4939 *arg++ = pgm;
4940 *arg++ = temp->name;
4941 *arg = NULL;
4942
4943 memset(&child, 0, sizeof(child));
4944 child.use_shell = 1;
4945 child.argv = argv;
4946 child.out = -1;
4947 if (start_command(&child)) {
4948 remove_tempfile();
4949 return NULL;
4950 }
4951
4952 if (strbuf_read(&buf, child.out, 0) < 0)
4953 err = error("error reading from textconv command '%s'", pgm);
4954 close(child.out);
4955
4956 if (finish_command(&child) || err) {
4957 strbuf_release(&buf);
4958 remove_tempfile();
4959 return NULL;
4960 }
4961 remove_tempfile();
4962
4963 return strbuf_detach(&buf, outsize);
4964 }
4965
4966 size_t fill_textconv(struct userdiff_driver *driver,
4967 struct diff_filespec *df,
4968 char **outbuf)
4969 {
4970 size_t size;
4971
4972 if (!driver || !driver->textconv) {
4973 if (!DIFF_FILE_VALID(df)) {
4974 *outbuf = "";
4975 return 0;
4976 }
4977 if (diff_populate_filespec(df, 0))
4978 die("unable to read files to diff");
4979 *outbuf = df->data;
4980 return df->size;
4981 }
4982
4983 if (driver->textconv_cache && df->sha1_valid) {
4984 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4985 &size);
4986 if (*outbuf)
4987 return size;
4988 }
4989
4990 *outbuf = run_textconv(driver->textconv, df, &size);
4991 if (!*outbuf)
4992 die("unable to read files to diff");
4993
4994 if (driver->textconv_cache && df->sha1_valid) {
4995 /* ignore errors, as we might be in a readonly repository */
4996 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4997 size);
4998 /*
4999 * we could save up changes and flush them all at the end,
5000 * but we would need an extra call after all diffing is done.
5001 * Since generating a cache entry is the slow path anyway,
5002 * this extra overhead probably isn't a big deal.
5003 */
5004 notes_cache_write(driver->textconv_cache);
5005 }
5006
5007 return size;
5008 }
5009
5010 void setup_diff_pager(struct diff_options *opt)
5011 {
5012 /*
5013 * If the user asked for our exit code, then either they want --quiet
5014 * or --exit-code. We should definitely not bother with a pager in the
5015 * former case, as we will generate no output. Since we still properly
5016 * report our exit code even when a pager is run, we _could_ run a
5017 * pager with --exit-code. But since we have not done so historically,
5018 * and because it is easy to find people oneline advising "git diff
5019 * --exit-code" in hooks and other scripts, we do not do so.
5020 */
5021 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5022 check_pager_config("diff") != 0)
5023 setup_pager();
5024 }
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