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Documentation: adjust document title underlining
[git/debian.git] / diff.c
blobd7a5c81bb8545584ce5fe652dc42f2ee8bc1e2fd
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, CHECK_SIZE_ONLY);
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, CHECK_SIZE_ONLY);
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, CHECK_SIZE_ONLY);
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, CHECK_BINARY);
2192 if (one->is_binary == -1 && 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 (!one->data && !two->data &&
2328 S_ISREG(one->mode) && S_ISREG(two->mode) &&
2329 !DIFF_OPT_TST(o, BINARY)) {
2330 if (!hashcmp(one->sha1, two->sha1)) {
2331 if (must_show_header)
2332 fprintf(o->file, "%s", header.buf);
2333 goto free_ab_and_return;
2334 }
2335 fprintf(o->file, "%s", header.buf);
2336 fprintf(o->file, "%sBinary files %s and %s differ\n",
2337 line_prefix, lbl[0], lbl[1]);
2338 goto free_ab_and_return;
2339 }
2340 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2341 die("unable to read files to diff");
2342 /* Quite common confusing case */
2343 if (mf1.size == mf2.size &&
2344 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2345 if (must_show_header)
2346 fprintf(o->file, "%s", header.buf);
2347 goto free_ab_and_return;
2348 }
2349 fprintf(o->file, "%s", header.buf);
2350 strbuf_reset(&header);
2351 if (DIFF_OPT_TST(o, BINARY))
2352 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2353 else
2354 fprintf(o->file, "%sBinary files %s and %s differ\n",
2355 line_prefix, lbl[0], lbl[1]);
2356 o->found_changes = 1;
2357 } else {
2358 /* Crazy xdl interfaces.. */
2359 const char *diffopts = getenv("GIT_DIFF_OPTS");
2360 const char *v;
2361 xpparam_t xpp;
2362 xdemitconf_t xecfg;
2363 struct emit_callback ecbdata;
2364 const struct userdiff_funcname *pe;
2365
2366 if (must_show_header) {
2367 fprintf(o->file, "%s", header.buf);
2368 strbuf_reset(&header);
2369 }
2370
2371 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2372 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2373
2374 pe = diff_funcname_pattern(one);
2375 if (!pe)
2376 pe = diff_funcname_pattern(two);
2377
2378 memset(&xpp, 0, sizeof(xpp));
2379 memset(&xecfg, 0, sizeof(xecfg));
2380 memset(&ecbdata, 0, sizeof(ecbdata));
2381 ecbdata.label_path = lbl;
2382 ecbdata.color_diff = want_color(o->use_color);
2383 ecbdata.found_changesp = &o->found_changes;
2384 ecbdata.ws_rule = whitespace_rule(name_b);
2385 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2386 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2387 ecbdata.opt = o;
2388 ecbdata.header = header.len ? &header : NULL;
2389 xpp.flags = o->xdl_opts;
2390 xecfg.ctxlen = o->context;
2391 xecfg.interhunkctxlen = o->interhunkcontext;
2392 xecfg.flags = XDL_EMIT_FUNCNAMES;
2393 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2394 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2395 if (pe)
2396 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2397 if (!diffopts)
2398 ;
2399 else if (skip_prefix(diffopts, "--unified=", &v))
2400 xecfg.ctxlen = strtoul(v, NULL, 10);
2401 else if (skip_prefix(diffopts, "-u", &v))
2402 xecfg.ctxlen = strtoul(v, NULL, 10);
2403 if (o->word_diff)
2404 init_diff_words_data(&ecbdata, o, one, two);
2405 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2406 &xpp, &xecfg);
2407 if (o->word_diff)
2408 free_diff_words_data(&ecbdata);
2409 if (textconv_one)
2410 free(mf1.ptr);
2411 if (textconv_two)
2412 free(mf2.ptr);
2413 xdiff_clear_find_func(&xecfg);
2414 }
2415
2416 free_ab_and_return:
2417 strbuf_release(&header);
2418 diff_free_filespec_data(one);
2419 diff_free_filespec_data(two);
2420 free(a_one);
2421 free(b_two);
2422 return;
2423 }
2424
2425 static void builtin_diffstat(const char *name_a, const char *name_b,
2426 struct diff_filespec *one,
2427 struct diff_filespec *two,
2428 struct diffstat_t *diffstat,
2429 struct diff_options *o,
2430 struct diff_filepair *p)
2431 {
2432 mmfile_t mf1, mf2;
2433 struct diffstat_file *data;
2434 int same_contents;
2435 int complete_rewrite = 0;
2436
2437 if (!DIFF_PAIR_UNMERGED(p)) {
2438 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2439 complete_rewrite = 1;
2440 }
2441
2442 data = diffstat_add(diffstat, name_a, name_b);
2443 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2444
2445 if (!one || !two) {
2446 data->is_unmerged = 1;
2447 return;
2448 }
2449
2450 same_contents = !hashcmp(one->sha1, two->sha1);
2451
2452 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2453 data->is_binary = 1;
2454 if (same_contents) {
2455 data->added = 0;
2456 data->deleted = 0;
2457 } else {
2458 data->added = diff_filespec_size(two);
2459 data->deleted = diff_filespec_size(one);
2460 }
2461 }
2462
2463 else if (complete_rewrite) {
2464 diff_populate_filespec(one, 0);
2465 diff_populate_filespec(two, 0);
2466 data->deleted = count_lines(one->data, one->size);
2467 data->added = count_lines(two->data, two->size);
2468 }
2469
2470 else if (!same_contents) {
2471 /* Crazy xdl interfaces.. */
2472 xpparam_t xpp;
2473 xdemitconf_t xecfg;
2474
2475 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2476 die("unable to read files to diff");
2477
2478 memset(&xpp, 0, sizeof(xpp));
2479 memset(&xecfg, 0, sizeof(xecfg));
2480 xpp.flags = o->xdl_opts;
2481 xecfg.ctxlen = o->context;
2482 xecfg.interhunkctxlen = o->interhunkcontext;
2483 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2484 &xpp, &xecfg);
2485 }
2486
2487 diff_free_filespec_data(one);
2488 diff_free_filespec_data(two);
2489 }
2490
2491 static void builtin_checkdiff(const char *name_a, const char *name_b,
2492 const char *attr_path,
2493 struct diff_filespec *one,
2494 struct diff_filespec *two,
2495 struct diff_options *o)
2496 {
2497 mmfile_t mf1, mf2;
2498 struct checkdiff_t data;
2499
2500 if (!two)
2501 return;
2502
2503 memset(&data, 0, sizeof(data));
2504 data.filename = name_b ? name_b : name_a;
2505 data.lineno = 0;
2506 data.o = o;
2507 data.ws_rule = whitespace_rule(attr_path);
2508 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2509
2510 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2511 die("unable to read files to diff");
2512
2513 /*
2514 * All the other codepaths check both sides, but not checking
2515 * the "old" side here is deliberate. We are checking the newly
2516 * introduced changes, and as long as the "new" side is text, we
2517 * can and should check what it introduces.
2518 */
2519 if (diff_filespec_is_binary(two))
2520 goto free_and_return;
2521 else {
2522 /* Crazy xdl interfaces.. */
2523 xpparam_t xpp;
2524 xdemitconf_t xecfg;
2525
2526 memset(&xpp, 0, sizeof(xpp));
2527 memset(&xecfg, 0, sizeof(xecfg));
2528 xecfg.ctxlen = 1; /* at least one context line */
2529 xpp.flags = 0;
2530 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2531 &xpp, &xecfg);
2532
2533 if (data.ws_rule & WS_BLANK_AT_EOF) {
2534 struct emit_callback ecbdata;
2535 int blank_at_eof;
2536
2537 ecbdata.ws_rule = data.ws_rule;
2538 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2539 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2540
2541 if (blank_at_eof) {
2542 static char *err;
2543 if (!err)
2544 err = whitespace_error_string(WS_BLANK_AT_EOF);
2545 fprintf(o->file, "%s:%d: %s.\n",
2546 data.filename, blank_at_eof, err);
2547 data.status = 1; /* report errors */
2548 }
2549 }
2550 }
2551 free_and_return:
2552 diff_free_filespec_data(one);
2553 diff_free_filespec_data(two);
2554 if (data.status)
2555 DIFF_OPT_SET(o, CHECK_FAILED);
2556 }
2557
2558 struct diff_filespec *alloc_filespec(const char *path)
2559 {
2560 int namelen = strlen(path);
2561 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2562
2563 memset(spec, 0, sizeof(*spec));
2564 spec->path = (char *)(spec + 1);
2565 memcpy(spec->path, path, namelen+1);
2566 spec->count = 1;
2567 spec->is_binary = -1;
2568 return spec;
2569 }
2570
2571 void free_filespec(struct diff_filespec *spec)
2572 {
2573 if (!--spec->count) {
2574 diff_free_filespec_data(spec);
2575 free(spec);
2576 }
2577 }
2578
2579 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2580 int sha1_valid, unsigned short mode)
2581 {
2582 if (mode) {
2583 spec->mode = canon_mode(mode);
2584 hashcpy(spec->sha1, sha1);
2585 spec->sha1_valid = sha1_valid;
2586 }
2587 }
2588
2589 /*
2590 * Given a name and sha1 pair, if the index tells us the file in
2591 * the work tree has that object contents, return true, so that
2592 * prepare_temp_file() does not have to inflate and extract.
2593 */
2594 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2595 {
2596 const struct cache_entry *ce;
2597 struct stat st;
2598 int pos, len;
2599
2600 /*
2601 * We do not read the cache ourselves here, because the
2602 * benchmark with my previous version that always reads cache
2603 * shows that it makes things worse for diff-tree comparing
2604 * two linux-2.6 kernel trees in an already checked out work
2605 * tree. This is because most diff-tree comparisons deal with
2606 * only a small number of files, while reading the cache is
2607 * expensive for a large project, and its cost outweighs the
2608 * savings we get by not inflating the object to a temporary
2609 * file. Practically, this code only helps when we are used
2610 * by diff-cache --cached, which does read the cache before
2611 * calling us.
2612 */
2613 if (!active_cache)
2614 return 0;
2615
2616 /* We want to avoid the working directory if our caller
2617 * doesn't need the data in a normal file, this system
2618 * is rather slow with its stat/open/mmap/close syscalls,
2619 * and the object is contained in a pack file. The pack
2620 * is probably already open and will be faster to obtain
2621 * the data through than the working directory. Loose
2622 * objects however would tend to be slower as they need
2623 * to be individually opened and inflated.
2624 */
2625 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2626 return 0;
2627
2628 len = strlen(name);
2629 pos = cache_name_pos(name, len);
2630 if (pos < 0)
2631 return 0;
2632 ce = active_cache[pos];
2633
2634 /*
2635 * This is not the sha1 we are looking for, or
2636 * unreusable because it is not a regular file.
2637 */
2638 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2639 return 0;
2640
2641 /*
2642 * If ce is marked as "assume unchanged", there is no
2643 * guarantee that work tree matches what we are looking for.
2644 */
2645 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2646 return 0;
2647
2648 /*
2649 * If ce matches the file in the work tree, we can reuse it.
2650 */
2651 if (ce_uptodate(ce) ||
2652 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2653 return 1;
2654
2655 return 0;
2656 }
2657
2658 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2659 {
2660 int len;
2661 char *data = xmalloc(100), *dirty = "";
2662
2663 /* Are we looking at the work tree? */
2664 if (s->dirty_submodule)
2665 dirty = "-dirty";
2666
2667 len = snprintf(data, 100,
2668 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2669 s->data = data;
2670 s->size = len;
2671 s->should_free = 1;
2672 if (size_only) {
2673 s->data = NULL;
2674 free(data);
2675 }
2676 return 0;
2677 }
2678
2679 /*
2680 * While doing rename detection and pickaxe operation, we may need to
2681 * grab the data for the blob (or file) for our own in-core comparison.
2682 * diff_filespec has data and size fields for this purpose.
2683 */
2684 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
2685 {
2686 int size_only = flags & CHECK_SIZE_ONLY;
2687 int err = 0;
2688 /*
2689 * demote FAIL to WARN to allow inspecting the situation
2690 * instead of refusing.
2691 */
2692 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2693 ? SAFE_CRLF_WARN
2694 : safe_crlf);
2695
2696 if (!DIFF_FILE_VALID(s))
2697 die("internal error: asking to populate invalid file.");
2698 if (S_ISDIR(s->mode))
2699 return -1;
2700
2701 if (s->data)
2702 return 0;
2703
2704 if (size_only && 0 < s->size)
2705 return 0;
2706
2707 if (S_ISGITLINK(s->mode))
2708 return diff_populate_gitlink(s, size_only);
2709
2710 if (!s->sha1_valid ||
2711 reuse_worktree_file(s->path, s->sha1, 0)) {
2712 struct strbuf buf = STRBUF_INIT;
2713 struct stat st;
2714 int fd;
2715
2716 if (lstat(s->path, &st) < 0) {
2717 if (errno == ENOENT) {
2718 err_empty:
2719 err = -1;
2720 empty:
2721 s->data = (char *)"";
2722 s->size = 0;
2723 return err;
2724 }
2725 }
2726 s->size = xsize_t(st.st_size);
2727 if (!s->size)
2728 goto empty;
2729 if (S_ISLNK(st.st_mode)) {
2730 struct strbuf sb = STRBUF_INIT;
2731
2732 if (strbuf_readlink(&sb, s->path, s->size))
2733 goto err_empty;
2734 s->size = sb.len;
2735 s->data = strbuf_detach(&sb, NULL);
2736 s->should_free = 1;
2737 return 0;
2738 }
2739 if (size_only)
2740 return 0;
2741 if ((flags & CHECK_BINARY) &&
2742 s->size > big_file_threshold && s->is_binary == -1) {
2743 s->is_binary = 1;
2744 return 0;
2745 }
2746 fd = open(s->path, O_RDONLY);
2747 if (fd < 0)
2748 goto err_empty;
2749 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2750 close(fd);
2751 s->should_munmap = 1;
2752
2753 /*
2754 * Convert from working tree format to canonical git format
2755 */
2756 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2757 size_t size = 0;
2758 munmap(s->data, s->size);
2759 s->should_munmap = 0;
2760 s->data = strbuf_detach(&buf, &size);
2761 s->size = size;
2762 s->should_free = 1;
2763 }
2764 }
2765 else {
2766 enum object_type type;
2767 if (size_only || (flags & CHECK_BINARY)) {
2768 type = sha1_object_info(s->sha1, &s->size);
2769 if (type < 0)
2770 die("unable to read %s", sha1_to_hex(s->sha1));
2771 if (size_only)
2772 return 0;
2773 if (s->size > big_file_threshold && s->is_binary == -1) {
2774 s->is_binary = 1;
2775 return 0;
2776 }
2777 }
2778 s->data = read_sha1_file(s->sha1, &type, &s->size);
2779 if (!s->data)
2780 die("unable to read %s", sha1_to_hex(s->sha1));
2781 s->should_free = 1;
2782 }
2783 return 0;
2784 }
2785
2786 void diff_free_filespec_blob(struct diff_filespec *s)
2787 {
2788 if (s->should_free)
2789 free(s->data);
2790 else if (s->should_munmap)
2791 munmap(s->data, s->size);
2792
2793 if (s->should_free || s->should_munmap) {
2794 s->should_free = s->should_munmap = 0;
2795 s->data = NULL;
2796 }
2797 }
2798
2799 void diff_free_filespec_data(struct diff_filespec *s)
2800 {
2801 diff_free_filespec_blob(s);
2802 free(s->cnt_data);
2803 s->cnt_data = NULL;
2804 }
2805
2806 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2807 void *blob,
2808 unsigned long size,
2809 const unsigned char *sha1,
2810 int mode)
2811 {
2812 int fd;
2813 struct strbuf buf = STRBUF_INIT;
2814 struct strbuf template = STRBUF_INIT;
2815 char *path_dup = xstrdup(path);
2816 const char *base = basename(path_dup);
2817
2818 /* Generate "XXXXXX_basename.ext" */
2819 strbuf_addstr(&template, "XXXXXX_");
2820 strbuf_addstr(&template, base);
2821
2822 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2823 strlen(base) + 1);
2824 if (fd < 0)
2825 die_errno("unable to create temp-file");
2826 if (convert_to_working_tree(path,
2827 (const char *)blob, (size_t)size, &buf)) {
2828 blob = buf.buf;
2829 size = buf.len;
2830 }
2831 if (write_in_full(fd, blob, size) != size)
2832 die_errno("unable to write temp-file");
2833 close(fd);
2834 temp->name = temp->tmp_path;
2835 strcpy(temp->hex, sha1_to_hex(sha1));
2836 temp->hex[40] = 0;
2837 sprintf(temp->mode, "%06o", mode);
2838 strbuf_release(&buf);
2839 strbuf_release(&template);
2840 free(path_dup);
2841 }
2842
2843 static struct diff_tempfile *prepare_temp_file(const char *name,
2844 struct diff_filespec *one)
2845 {
2846 struct diff_tempfile *temp = claim_diff_tempfile();
2847
2848 if (!DIFF_FILE_VALID(one)) {
2849 not_a_valid_file:
2850 /* A '-' entry produces this for file-2, and
2851 * a '+' entry produces this for file-1.
2852 */
2853 temp->name = "/dev/null";
2854 strcpy(temp->hex, ".");
2855 strcpy(temp->mode, ".");
2856 return temp;
2857 }
2858
2859 if (!remove_tempfile_installed) {
2860 atexit(remove_tempfile);
2861 sigchain_push_common(remove_tempfile_on_signal);
2862 remove_tempfile_installed = 1;
2863 }
2864
2865 if (!S_ISGITLINK(one->mode) &&
2866 (!one->sha1_valid ||
2867 reuse_worktree_file(name, one->sha1, 1))) {
2868 struct stat st;
2869 if (lstat(name, &st) < 0) {
2870 if (errno == ENOENT)
2871 goto not_a_valid_file;
2872 die_errno("stat(%s)", name);
2873 }
2874 if (S_ISLNK(st.st_mode)) {
2875 struct strbuf sb = STRBUF_INIT;
2876 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2877 die_errno("readlink(%s)", name);
2878 prep_temp_blob(name, temp, sb.buf, sb.len,
2879 (one->sha1_valid ?
2880 one->sha1 : null_sha1),
2881 (one->sha1_valid ?
2882 one->mode : S_IFLNK));
2883 strbuf_release(&sb);
2884 }
2885 else {
2886 /* we can borrow from the file in the work tree */
2887 temp->name = name;
2888 if (!one->sha1_valid)
2889 strcpy(temp->hex, sha1_to_hex(null_sha1));
2890 else
2891 strcpy(temp->hex, sha1_to_hex(one->sha1));
2892 /* Even though we may sometimes borrow the
2893 * contents from the work tree, we always want
2894 * one->mode. mode is trustworthy even when
2895 * !(one->sha1_valid), as long as
2896 * DIFF_FILE_VALID(one).
2897 */
2898 sprintf(temp->mode, "%06o", one->mode);
2899 }
2900 return temp;
2901 }
2902 else {
2903 if (diff_populate_filespec(one, 0))
2904 die("cannot read data blob for %s", one->path);
2905 prep_temp_blob(name, temp, one->data, one->size,
2906 one->sha1, one->mode);
2907 }
2908 return temp;
2909 }
2910
2911 static void add_external_diff_name(struct argv_array *argv,
2912 const char *name,
2913 struct diff_filespec *df)
2914 {
2915 struct diff_tempfile *temp = prepare_temp_file(name, df);
2916 argv_array_push(argv, temp->name);
2917 argv_array_push(argv, temp->hex);
2918 argv_array_push(argv, temp->mode);
2919 }
2920
2921 /* An external diff command takes:
2922 *
2923 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2924 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2925 *
2926 */
2927 static void run_external_diff(const char *pgm,
2928 const char *name,
2929 const char *other,
2930 struct diff_filespec *one,
2931 struct diff_filespec *two,
2932 const char *xfrm_msg,
2933 int complete_rewrite,
2934 struct diff_options *o)
2935 {
2936 struct argv_array argv = ARGV_ARRAY_INIT;
2937 struct argv_array env = ARGV_ARRAY_INIT;
2938 struct diff_queue_struct *q = &diff_queued_diff;
2939
2940 argv_array_push(&argv, pgm);
2941 argv_array_push(&argv, name);
2942
2943 if (one && two) {
2944 add_external_diff_name(&argv, name, one);
2945 if (!other)
2946 add_external_diff_name(&argv, name, two);
2947 else {
2948 add_external_diff_name(&argv, other, two);
2949 argv_array_push(&argv, other);
2950 argv_array_push(&argv, xfrm_msg);
2951 }
2952 }
2953
2954 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
2955 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
2956
2957 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
2958 die(_("external diff died, stopping at %s"), name);
2959
2960 remove_tempfile();
2961 argv_array_clear(&argv);
2962 argv_array_clear(&env);
2963 }
2964
2965 static int similarity_index(struct diff_filepair *p)
2966 {
2967 return p->score * 100 / MAX_SCORE;
2968 }
2969
2970 static void fill_metainfo(struct strbuf *msg,
2971 const char *name,
2972 const char *other,
2973 struct diff_filespec *one,
2974 struct diff_filespec *two,
2975 struct diff_options *o,
2976 struct diff_filepair *p,
2977 int *must_show_header,
2978 int use_color)
2979 {
2980 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2981 const char *reset = diff_get_color(use_color, DIFF_RESET);
2982 const char *line_prefix = diff_line_prefix(o);
2983
2984 *must_show_header = 1;
2985 strbuf_init(msg, PATH_MAX * 2 + 300);
2986 switch (p->status) {
2987 case DIFF_STATUS_COPIED:
2988 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2989 line_prefix, set, similarity_index(p));
2990 strbuf_addf(msg, "%s\n%s%scopy from ",
2991 reset, line_prefix, set);
2992 quote_c_style(name, msg, NULL, 0);
2993 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2994 quote_c_style(other, msg, NULL, 0);
2995 strbuf_addf(msg, "%s\n", reset);
2996 break;
2997 case DIFF_STATUS_RENAMED:
2998 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2999 line_prefix, set, similarity_index(p));
3000 strbuf_addf(msg, "%s\n%s%srename from ",
3001 reset, line_prefix, set);
3002 quote_c_style(name, msg, NULL, 0);
3003 strbuf_addf(msg, "%s\n%s%srename to ",
3004 reset, line_prefix, set);
3005 quote_c_style(other, msg, NULL, 0);
3006 strbuf_addf(msg, "%s\n", reset);
3007 break;
3008 case DIFF_STATUS_MODIFIED:
3009 if (p->score) {
3010 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3011 line_prefix,
3012 set, similarity_index(p), reset);
3013 break;
3014 }
3015 /* fallthru */
3016 default:
3017 *must_show_header = 0;
3018 }
3019 if (one && two && hashcmp(one->sha1, two->sha1)) {
3020 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3021
3022 if (DIFF_OPT_TST(o, BINARY)) {
3023 mmfile_t mf;
3024 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3025 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3026 abbrev = 40;
3027 }
3028 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3029 find_unique_abbrev(one->sha1, abbrev));
3030 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3031 if (one->mode == two->mode)
3032 strbuf_addf(msg, " %06o", one->mode);
3033 strbuf_addf(msg, "%s\n", reset);
3034 }
3035 }
3036
3037 static void run_diff_cmd(const char *pgm,
3038 const char *name,
3039 const char *other,
3040 const char *attr_path,
3041 struct diff_filespec *one,
3042 struct diff_filespec *two,
3043 struct strbuf *msg,
3044 struct diff_options *o,
3045 struct diff_filepair *p)
3046 {
3047 const char *xfrm_msg = NULL;
3048 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3049 int must_show_header = 0;
3050
3051
3052 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3053 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3054 if (drv && drv->external)
3055 pgm = drv->external;
3056 }
3057
3058 if (msg) {
3059 /*
3060 * don't use colors when the header is intended for an
3061 * external diff driver
3062 */
3063 fill_metainfo(msg, name, other, one, two, o, p,
3064 &must_show_header,
3065 want_color(o->use_color) && !pgm);
3066 xfrm_msg = msg->len ? msg->buf : NULL;
3067 }
3068
3069 if (pgm) {
3070 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3071 complete_rewrite, o);
3072 return;
3073 }
3074 if (one && two)
3075 builtin_diff(name, other ? other : name,
3076 one, two, xfrm_msg, must_show_header,
3077 o, complete_rewrite);
3078 else
3079 fprintf(o->file, "* Unmerged path %s\n", name);
3080 }
3081
3082 static void diff_fill_sha1_info(struct diff_filespec *one)
3083 {
3084 if (DIFF_FILE_VALID(one)) {
3085 if (!one->sha1_valid) {
3086 struct stat st;
3087 if (one->is_stdin) {
3088 hashcpy(one->sha1, null_sha1);
3089 return;
3090 }
3091 if (lstat(one->path, &st) < 0)
3092 die_errno("stat '%s'", one->path);
3093 if (index_path(one->sha1, one->path, &st, 0))
3094 die("cannot hash %s", one->path);
3095 }
3096 }
3097 else
3098 hashclr(one->sha1);
3099 }
3100
3101 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3102 {
3103 /* Strip the prefix but do not molest /dev/null and absolute paths */
3104 if (*namep && **namep != '/') {
3105 *namep += prefix_length;
3106 if (**namep == '/')
3107 ++*namep;
3108 }
3109 if (*otherp && **otherp != '/') {
3110 *otherp += prefix_length;
3111 if (**otherp == '/')
3112 ++*otherp;
3113 }
3114 }
3115
3116 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3117 {
3118 const char *pgm = external_diff();
3119 struct strbuf msg;
3120 struct diff_filespec *one = p->one;
3121 struct diff_filespec *two = p->two;
3122 const char *name;
3123 const char *other;
3124 const char *attr_path;
3125
3126 name = p->one->path;
3127 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3128 attr_path = name;
3129 if (o->prefix_length)
3130 strip_prefix(o->prefix_length, &name, &other);
3131
3132 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3133 pgm = NULL;
3134
3135 if (DIFF_PAIR_UNMERGED(p)) {
3136 run_diff_cmd(pgm, name, NULL, attr_path,
3137 NULL, NULL, NULL, o, p);
3138 return;
3139 }
3140
3141 diff_fill_sha1_info(one);
3142 diff_fill_sha1_info(two);
3143
3144 if (!pgm &&
3145 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3146 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3147 /*
3148 * a filepair that changes between file and symlink
3149 * needs to be split into deletion and creation.
3150 */
3151 struct diff_filespec *null = alloc_filespec(two->path);
3152 run_diff_cmd(NULL, name, other, attr_path,
3153 one, null, &msg, o, p);
3154 free(null);
3155 strbuf_release(&msg);
3156
3157 null = alloc_filespec(one->path);
3158 run_diff_cmd(NULL, name, other, attr_path,
3159 null, two, &msg, o, p);
3160 free(null);
3161 }
3162 else
3163 run_diff_cmd(pgm, name, other, attr_path,
3164 one, two, &msg, o, p);
3165
3166 strbuf_release(&msg);
3167 }
3168
3169 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3170 struct diffstat_t *diffstat)
3171 {
3172 const char *name;
3173 const char *other;
3174
3175 if (DIFF_PAIR_UNMERGED(p)) {
3176 /* unmerged */
3177 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3178 return;
3179 }
3180
3181 name = p->one->path;
3182 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
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_diffstat(name, other, p->one, p->two, diffstat, o, p);
3191 }
3192
3193 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3194 {
3195 const char *name;
3196 const char *other;
3197 const char *attr_path;
3198
3199 if (DIFF_PAIR_UNMERGED(p)) {
3200 /* unmerged */
3201 return;
3202 }
3203
3204 name = p->one->path;
3205 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3206 attr_path = other ? other : name;
3207
3208 if (o->prefix_length)
3209 strip_prefix(o->prefix_length, &name, &other);
3210
3211 diff_fill_sha1_info(p->one);
3212 diff_fill_sha1_info(p->two);
3213
3214 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3215 }
3216
3217 void diff_setup(struct diff_options *options)
3218 {
3219 memcpy(options, &default_diff_options, sizeof(*options));
3220
3221 options->file = stdout;
3222
3223 options->line_termination = '\n';
3224 options->break_opt = -1;
3225 options->rename_limit = -1;
3226 options->dirstat_permille = diff_dirstat_permille_default;
3227 options->context = diff_context_default;
3228 DIFF_OPT_SET(options, RENAME_EMPTY);
3229
3230 /* pathchange left =NULL by default */
3231 options->change = diff_change;
3232 options->add_remove = diff_addremove;
3233 options->use_color = diff_use_color_default;
3234 options->detect_rename = diff_detect_rename_default;
3235 options->xdl_opts |= diff_algorithm;
3236
3237 options->orderfile = diff_order_file_cfg;
3238
3239 if (diff_no_prefix) {
3240 options->a_prefix = options->b_prefix = "";
3241 } else if (!diff_mnemonic_prefix) {
3242 options->a_prefix = "a/";
3243 options->b_prefix = "b/";
3244 }
3245 }
3246
3247 void diff_setup_done(struct diff_options *options)
3248 {
3249 int count = 0;
3250
3251 if (options->set_default)
3252 options->set_default(options);
3253
3254 if (options->output_format & DIFF_FORMAT_NAME)
3255 count++;
3256 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3257 count++;
3258 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3259 count++;
3260 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3261 count++;
3262 if (count > 1)
3263 die("--name-only, --name-status, --check and -s are mutually exclusive");
3264
3265 /*
3266 * Most of the time we can say "there are changes"
3267 * only by checking if there are changed paths, but
3268 * --ignore-whitespace* options force us to look
3269 * inside contents.
3270 */
3271
3272 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3273 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3274 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3275 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3276 else
3277 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3278
3279 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3280 options->detect_rename = DIFF_DETECT_COPY;
3281
3282 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3283 options->prefix = NULL;
3284 if (options->prefix)
3285 options->prefix_length = strlen(options->prefix);
3286 else
3287 options->prefix_length = 0;
3288
3289 if (options->output_format & (DIFF_FORMAT_NAME |
3290 DIFF_FORMAT_NAME_STATUS |
3291 DIFF_FORMAT_CHECKDIFF |
3292 DIFF_FORMAT_NO_OUTPUT))
3293 options->output_format &= ~(DIFF_FORMAT_RAW |
3294 DIFF_FORMAT_NUMSTAT |
3295 DIFF_FORMAT_DIFFSTAT |
3296 DIFF_FORMAT_SHORTSTAT |
3297 DIFF_FORMAT_DIRSTAT |
3298 DIFF_FORMAT_SUMMARY |
3299 DIFF_FORMAT_PATCH);
3300
3301 /*
3302 * These cases always need recursive; we do not drop caller-supplied
3303 * recursive bits for other formats here.
3304 */
3305 if (options->output_format & (DIFF_FORMAT_PATCH |
3306 DIFF_FORMAT_NUMSTAT |
3307 DIFF_FORMAT_DIFFSTAT |
3308 DIFF_FORMAT_SHORTSTAT |
3309 DIFF_FORMAT_DIRSTAT |
3310 DIFF_FORMAT_SUMMARY |
3311 DIFF_FORMAT_CHECKDIFF))
3312 DIFF_OPT_SET(options, RECURSIVE);
3313 /*
3314 * Also pickaxe would not work very well if you do not say recursive
3315 */
3316 if (options->pickaxe)
3317 DIFF_OPT_SET(options, RECURSIVE);
3318 /*
3319 * When patches are generated, submodules diffed against the work tree
3320 * must be checked for dirtiness too so it can be shown in the output
3321 */
3322 if (options->output_format & DIFF_FORMAT_PATCH)
3323 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3324
3325 if (options->detect_rename && options->rename_limit < 0)
3326 options->rename_limit = diff_rename_limit_default;
3327 if (options->setup & DIFF_SETUP_USE_CACHE) {
3328 if (!active_cache)
3329 /* read-cache does not die even when it fails
3330 * so it is safe for us to do this here. Also
3331 * it does not smudge active_cache or active_nr
3332 * when it fails, so we do not have to worry about
3333 * cleaning it up ourselves either.
3334 */
3335 read_cache();
3336 }
3337 if (options->abbrev <= 0 || 40 < options->abbrev)
3338 options->abbrev = 40; /* full */
3339
3340 /*
3341 * It does not make sense to show the first hit we happened
3342 * to have found. It does not make sense not to return with
3343 * exit code in such a case either.
3344 */
3345 if (DIFF_OPT_TST(options, QUICK)) {
3346 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3347 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3348 }
3349
3350 options->diff_path_counter = 0;
3351
3352 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3353 die(_("--follow requires exactly one pathspec"));
3354 }
3355
3356 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3357 {
3358 char c, *eq;
3359 int len;
3360
3361 if (*arg != '-')
3362 return 0;
3363 c = *++arg;
3364 if (!c)
3365 return 0;
3366 if (c == arg_short) {
3367 c = *++arg;
3368 if (!c)
3369 return 1;
3370 if (val && isdigit(c)) {
3371 char *end;
3372 int n = strtoul(arg, &end, 10);
3373 if (*end)
3374 return 0;
3375 *val = n;
3376 return 1;
3377 }
3378 return 0;
3379 }
3380 if (c != '-')
3381 return 0;
3382 arg++;
3383 eq = strchrnul(arg, '=');
3384 len = eq - arg;
3385 if (!len || strncmp(arg, arg_long, len))
3386 return 0;
3387 if (*eq) {
3388 int n;
3389 char *end;
3390 if (!isdigit(*++eq))
3391 return 0;
3392 n = strtoul(eq, &end, 10);
3393 if (*end)
3394 return 0;
3395 *val = n;
3396 }
3397 return 1;
3398 }
3399
3400 static int diff_scoreopt_parse(const char *opt);
3401
3402 static inline int short_opt(char opt, const char **argv,
3403 const char **optarg)
3404 {
3405 const char *arg = argv[0];
3406 if (arg[0] != '-' || arg[1] != opt)
3407 return 0;
3408 if (arg[2] != '\0') {
3409 *optarg = arg + 2;
3410 return 1;
3411 }
3412 if (!argv[1])
3413 die("Option '%c' requires a value", opt);
3414 *optarg = argv[1];
3415 return 2;
3416 }
3417
3418 int parse_long_opt(const char *opt, const char **argv,
3419 const char **optarg)
3420 {
3421 const char *arg = argv[0];
3422 if (!skip_prefix(arg, "--", &arg))
3423 return 0;
3424 if (!skip_prefix(arg, opt, &arg))
3425 return 0;
3426 if (*arg == '=') { /* stuck form: --option=value */
3427 *optarg = arg + 1;
3428 return 1;
3429 }
3430 if (*arg != '\0')
3431 return 0;
3432 /* separate form: --option value */
3433 if (!argv[1])
3434 die("Option '--%s' requires a value", opt);
3435 *optarg = argv[1];
3436 return 2;
3437 }
3438
3439 static int stat_opt(struct diff_options *options, const char **av)
3440 {
3441 const char *arg = av[0];
3442 char *end;
3443 int width = options->stat_width;
3444 int name_width = options->stat_name_width;
3445 int graph_width = options->stat_graph_width;
3446 int count = options->stat_count;
3447 int argcount = 1;
3448
3449 if (!skip_prefix(arg, "--stat", &arg))
3450 die("BUG: stat option does not begin with --stat: %s", arg);
3451 end = (char *)arg;
3452
3453 switch (*arg) {
3454 case '-':
3455 if (skip_prefix(arg, "-width", &arg)) {
3456 if (*arg == '=')
3457 width = strtoul(arg + 1, &end, 10);
3458 else if (!*arg && !av[1])
3459 die("Option '--stat-width' requires a value");
3460 else if (!*arg) {
3461 width = strtoul(av[1], &end, 10);
3462 argcount = 2;
3463 }
3464 } else if (skip_prefix(arg, "-name-width", &arg)) {
3465 if (*arg == '=')
3466 name_width = strtoul(arg + 1, &end, 10);
3467 else if (!*arg && !av[1])
3468 die("Option '--stat-name-width' requires a value");
3469 else if (!*arg) {
3470 name_width = strtoul(av[1], &end, 10);
3471 argcount = 2;
3472 }
3473 } else if (skip_prefix(arg, "-graph-width", &arg)) {
3474 if (*arg == '=')
3475 graph_width = strtoul(arg + 1, &end, 10);
3476 else if (!*arg && !av[1])
3477 die("Option '--stat-graph-width' requires a value");
3478 else if (!*arg) {
3479 graph_width = strtoul(av[1], &end, 10);
3480 argcount = 2;
3481 }
3482 } else if (skip_prefix(arg, "-count", &arg)) {
3483 if (*arg == '=')
3484 count = strtoul(arg + 1, &end, 10);
3485 else if (!*arg && !av[1])
3486 die("Option '--stat-count' requires a value");
3487 else if (!*arg) {
3488 count = strtoul(av[1], &end, 10);
3489 argcount = 2;
3490 }
3491 }
3492 break;
3493 case '=':
3494 width = strtoul(arg+1, &end, 10);
3495 if (*end == ',')
3496 name_width = strtoul(end+1, &end, 10);
3497 if (*end == ',')
3498 count = strtoul(end+1, &end, 10);
3499 }
3500
3501 /* Important! This checks all the error cases! */
3502 if (*end)
3503 return 0;
3504 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3505 options->stat_name_width = name_width;
3506 options->stat_graph_width = graph_width;
3507 options->stat_width = width;
3508 options->stat_count = count;
3509 return argcount;
3510 }
3511
3512 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3513 {
3514 struct strbuf errmsg = STRBUF_INIT;
3515 if (parse_dirstat_params(options, params, &errmsg))
3516 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3517 errmsg.buf);
3518 strbuf_release(&errmsg);
3519 /*
3520 * The caller knows a dirstat-related option is given from the command
3521 * line; allow it to say "return this_function();"
3522 */
3523 options->output_format |= DIFF_FORMAT_DIRSTAT;
3524 return 1;
3525 }
3526
3527 static int parse_submodule_opt(struct diff_options *options, const char *value)
3528 {
3529 if (parse_submodule_params(options, value))
3530 die(_("Failed to parse --submodule option parameter: '%s'"),
3531 value);
3532 return 1;
3533 }
3534
3535 static const char diff_status_letters[] = {
3536 DIFF_STATUS_ADDED,
3537 DIFF_STATUS_COPIED,
3538 DIFF_STATUS_DELETED,
3539 DIFF_STATUS_MODIFIED,
3540 DIFF_STATUS_RENAMED,
3541 DIFF_STATUS_TYPE_CHANGED,
3542 DIFF_STATUS_UNKNOWN,
3543 DIFF_STATUS_UNMERGED,
3544 DIFF_STATUS_FILTER_AON,
3545 DIFF_STATUS_FILTER_BROKEN,
3546 '\0',
3547 };
3548
3549 static unsigned int filter_bit['Z' + 1];
3550
3551 static void prepare_filter_bits(void)
3552 {
3553 int i;
3554
3555 if (!filter_bit[DIFF_STATUS_ADDED]) {
3556 for (i = 0; diff_status_letters[i]; i++)
3557 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3558 }
3559 }
3560
3561 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3562 {
3563 return opt->filter & filter_bit[(int) status];
3564 }
3565
3566 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3567 {
3568 int i, optch;
3569
3570 prepare_filter_bits();
3571
3572 /*
3573 * If there is a negation e.g. 'd' in the input, and we haven't
3574 * initialized the filter field with another --diff-filter, start
3575 * from full set of bits, except for AON.
3576 */
3577 if (!opt->filter) {
3578 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3579 if (optch < 'a' || 'z' < optch)
3580 continue;
3581 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3582 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3583 break;
3584 }
3585 }
3586
3587 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3588 unsigned int bit;
3589 int negate;
3590
3591 if ('a' <= optch && optch <= 'z') {
3592 negate = 1;
3593 optch = toupper(optch);
3594 } else {
3595 negate = 0;
3596 }
3597
3598 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3599 if (!bit)
3600 return optarg[i];
3601 if (negate)
3602 opt->filter &= ~bit;
3603 else
3604 opt->filter |= bit;
3605 }
3606 return 0;
3607 }
3608
3609 static void enable_patch_output(int *fmt) {
3610 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3611 *fmt |= DIFF_FORMAT_PATCH;
3612 }
3613
3614 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3615 {
3616 const char *arg = av[0];
3617 const char *optarg;
3618 int argcount;
3619
3620 /* Output format options */
3621 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3622 || opt_arg(arg, 'U', "unified", &options->context))
3623 enable_patch_output(&options->output_format);
3624 else if (!strcmp(arg, "--raw"))
3625 options->output_format |= DIFF_FORMAT_RAW;
3626 else if (!strcmp(arg, "--patch-with-raw")) {
3627 enable_patch_output(&options->output_format);
3628 options->output_format |= DIFF_FORMAT_RAW;
3629 } else if (!strcmp(arg, "--numstat"))
3630 options->output_format |= DIFF_FORMAT_NUMSTAT;
3631 else if (!strcmp(arg, "--shortstat"))
3632 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3633 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3634 return parse_dirstat_opt(options, "");
3635 else if (skip_prefix(arg, "-X", &arg))
3636 return parse_dirstat_opt(options, arg);
3637 else if (skip_prefix(arg, "--dirstat=", &arg))
3638 return parse_dirstat_opt(options, arg);
3639 else if (!strcmp(arg, "--cumulative"))
3640 return parse_dirstat_opt(options, "cumulative");
3641 else if (!strcmp(arg, "--dirstat-by-file"))
3642 return parse_dirstat_opt(options, "files");
3643 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
3644 parse_dirstat_opt(options, "files");
3645 return parse_dirstat_opt(options, arg);
3646 }
3647 else if (!strcmp(arg, "--check"))
3648 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3649 else if (!strcmp(arg, "--summary"))
3650 options->output_format |= DIFF_FORMAT_SUMMARY;
3651 else if (!strcmp(arg, "--patch-with-stat")) {
3652 enable_patch_output(&options->output_format);
3653 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3654 } else if (!strcmp(arg, "--name-only"))
3655 options->output_format |= DIFF_FORMAT_NAME;
3656 else if (!strcmp(arg, "--name-status"))
3657 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3658 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3659 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3660 else if (starts_with(arg, "--stat"))
3661 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3662 return stat_opt(options, av);
3663
3664 /* renames options */
3665 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3666 !strcmp(arg, "--break-rewrites")) {
3667 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3668 return error("invalid argument to -B: %s", arg+2);
3669 }
3670 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3671 !strcmp(arg, "--find-renames")) {
3672 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3673 return error("invalid argument to -M: %s", arg+2);
3674 options->detect_rename = DIFF_DETECT_RENAME;
3675 }
3676 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3677 options->irreversible_delete = 1;
3678 }
3679 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3680 !strcmp(arg, "--find-copies")) {
3681 if (options->detect_rename == DIFF_DETECT_COPY)
3682 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3683 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3684 return error("invalid argument to -C: %s", arg+2);
3685 options->detect_rename = DIFF_DETECT_COPY;
3686 }
3687 else if (!strcmp(arg, "--no-renames"))
3688 options->detect_rename = 0;
3689 else if (!strcmp(arg, "--rename-empty"))
3690 DIFF_OPT_SET(options, RENAME_EMPTY);
3691 else if (!strcmp(arg, "--no-rename-empty"))
3692 DIFF_OPT_CLR(options, RENAME_EMPTY);
3693 else if (!strcmp(arg, "--relative"))
3694 DIFF_OPT_SET(options, RELATIVE_NAME);
3695 else if (skip_prefix(arg, "--relative=", &arg)) {
3696 DIFF_OPT_SET(options, RELATIVE_NAME);
3697 options->prefix = arg;
3698 }
3699
3700 /* xdiff options */
3701 else if (!strcmp(arg, "--minimal"))
3702 DIFF_XDL_SET(options, NEED_MINIMAL);
3703 else if (!strcmp(arg, "--no-minimal"))
3704 DIFF_XDL_CLR(options, NEED_MINIMAL);
3705 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3706 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3707 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3708 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3709 else if (!strcmp(arg, "--ignore-space-at-eol"))
3710 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3711 else if (!strcmp(arg, "--ignore-blank-lines"))
3712 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3713 else if (!strcmp(arg, "--patience"))
3714 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3715 else if (!strcmp(arg, "--histogram"))
3716 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3717 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3718 long value = parse_algorithm_value(optarg);
3719 if (value < 0)
3720 return error("option diff-algorithm accepts \"myers\", "
3721 "\"minimal\", \"patience\" and \"histogram\"");
3722 /* clear out previous settings */
3723 DIFF_XDL_CLR(options, NEED_MINIMAL);
3724 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3725 options->xdl_opts |= value;
3726 return argcount;
3727 }
3728
3729 /* flags options */
3730 else if (!strcmp(arg, "--binary")) {
3731 enable_patch_output(&options->output_format);
3732 DIFF_OPT_SET(options, BINARY);
3733 }
3734 else if (!strcmp(arg, "--full-index"))
3735 DIFF_OPT_SET(options, FULL_INDEX);
3736 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3737 DIFF_OPT_SET(options, TEXT);
3738 else if (!strcmp(arg, "-R"))
3739 DIFF_OPT_SET(options, REVERSE_DIFF);
3740 else if (!strcmp(arg, "--find-copies-harder"))
3741 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3742 else if (!strcmp(arg, "--follow"))
3743 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3744 else if (!strcmp(arg, "--no-follow"))
3745 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3746 else if (!strcmp(arg, "--color"))
3747 options->use_color = 1;
3748 else if (skip_prefix(arg, "--color=", &arg)) {
3749 int value = git_config_colorbool(NULL, arg);
3750 if (value < 0)
3751 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3752 options->use_color = value;
3753 }
3754 else if (!strcmp(arg, "--no-color"))
3755 options->use_color = 0;
3756 else if (!strcmp(arg, "--color-words")) {
3757 options->use_color = 1;
3758 options->word_diff = DIFF_WORDS_COLOR;
3759 }
3760 else if (skip_prefix(arg, "--color-words=", &arg)) {
3761 options->use_color = 1;
3762 options->word_diff = DIFF_WORDS_COLOR;
3763 options->word_regex = arg;
3764 }
3765 else if (!strcmp(arg, "--word-diff")) {
3766 if (options->word_diff == DIFF_WORDS_NONE)
3767 options->word_diff = DIFF_WORDS_PLAIN;
3768 }
3769 else if (skip_prefix(arg, "--word-diff=", &arg)) {
3770 if (!strcmp(arg, "plain"))
3771 options->word_diff = DIFF_WORDS_PLAIN;
3772 else if (!strcmp(arg, "color")) {
3773 options->use_color = 1;
3774 options->word_diff = DIFF_WORDS_COLOR;
3775 }
3776 else if (!strcmp(arg, "porcelain"))
3777 options->word_diff = DIFF_WORDS_PORCELAIN;
3778 else if (!strcmp(arg, "none"))
3779 options->word_diff = DIFF_WORDS_NONE;
3780 else
3781 die("bad --word-diff argument: %s", arg);
3782 }
3783 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3784 if (options->word_diff == DIFF_WORDS_NONE)
3785 options->word_diff = DIFF_WORDS_PLAIN;
3786 options->word_regex = optarg;
3787 return argcount;
3788 }
3789 else if (!strcmp(arg, "--exit-code"))
3790 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3791 else if (!strcmp(arg, "--quiet"))
3792 DIFF_OPT_SET(options, QUICK);
3793 else if (!strcmp(arg, "--ext-diff"))
3794 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3795 else if (!strcmp(arg, "--no-ext-diff"))
3796 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3797 else if (!strcmp(arg, "--textconv"))
3798 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3799 else if (!strcmp(arg, "--no-textconv"))
3800 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3801 else if (!strcmp(arg, "--ignore-submodules")) {
3802 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3803 handle_ignore_submodules_arg(options, "all");
3804 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
3805 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3806 handle_ignore_submodules_arg(options, arg);
3807 } else if (!strcmp(arg, "--submodule"))
3808 DIFF_OPT_SET(options, SUBMODULE_LOG);
3809 else if (skip_prefix(arg, "--submodule=", &arg))
3810 return parse_submodule_opt(options, arg);
3811
3812 /* misc options */
3813 else if (!strcmp(arg, "-z"))
3814 options->line_termination = 0;
3815 else if ((argcount = short_opt('l', av, &optarg))) {
3816 options->rename_limit = strtoul(optarg, NULL, 10);
3817 return argcount;
3818 }
3819 else if ((argcount = short_opt('S', av, &optarg))) {
3820 options->pickaxe = optarg;
3821 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3822 return argcount;
3823 } else if ((argcount = short_opt('G', av, &optarg))) {
3824 options->pickaxe = optarg;
3825 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3826 return argcount;
3827 }
3828 else if (!strcmp(arg, "--pickaxe-all"))
3829 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3830 else if (!strcmp(arg, "--pickaxe-regex"))
3831 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3832 else if ((argcount = short_opt('O', av, &optarg))) {
3833 options->orderfile = optarg;
3834 return argcount;
3835 }
3836 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3837 int offending = parse_diff_filter_opt(optarg, options);
3838 if (offending)
3839 die("unknown change class '%c' in --diff-filter=%s",
3840 offending, optarg);
3841 return argcount;
3842 }
3843 else if (!strcmp(arg, "--abbrev"))
3844 options->abbrev = DEFAULT_ABBREV;
3845 else if (skip_prefix(arg, "--abbrev=", &arg)) {
3846 options->abbrev = strtoul(arg, NULL, 10);
3847 if (options->abbrev < MINIMUM_ABBREV)
3848 options->abbrev = MINIMUM_ABBREV;
3849 else if (40 < options->abbrev)
3850 options->abbrev = 40;
3851 }
3852 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3853 options->a_prefix = optarg;
3854 return argcount;
3855 }
3856 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3857 options->b_prefix = optarg;
3858 return argcount;
3859 }
3860 else if (!strcmp(arg, "--no-prefix"))
3861 options->a_prefix = options->b_prefix = "";
3862 else if (opt_arg(arg, '\0', "inter-hunk-context",
3863 &options->interhunkcontext))
3864 ;
3865 else if (!strcmp(arg, "-W"))
3866 DIFF_OPT_SET(options, FUNCCONTEXT);
3867 else if (!strcmp(arg, "--function-context"))
3868 DIFF_OPT_SET(options, FUNCCONTEXT);
3869 else if (!strcmp(arg, "--no-function-context"))
3870 DIFF_OPT_CLR(options, FUNCCONTEXT);
3871 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3872 options->file = fopen(optarg, "w");
3873 if (!options->file)
3874 die_errno("Could not open '%s'", optarg);
3875 options->close_file = 1;
3876 return argcount;
3877 } else
3878 return 0;
3879 return 1;
3880 }
3881
3882 int parse_rename_score(const char **cp_p)
3883 {
3884 unsigned long num, scale;
3885 int ch, dot;
3886 const char *cp = *cp_p;
3887
3888 num = 0;
3889 scale = 1;
3890 dot = 0;
3891 for (;;) {
3892 ch = *cp;
3893 if ( !dot && ch == '.' ) {
3894 scale = 1;
3895 dot = 1;
3896 } else if ( ch == '%' ) {
3897 scale = dot ? scale*100 : 100;
3898 cp++; /* % is always at the end */
3899 break;
3900 } else if ( ch >= '0' && ch <= '9' ) {
3901 if ( scale < 100000 ) {
3902 scale *= 10;
3903 num = (num*10) + (ch-'0');
3904 }
3905 } else {
3906 break;
3907 }
3908 cp++;
3909 }
3910 *cp_p = cp;
3911
3912 /* user says num divided by scale and we say internally that
3913 * is MAX_SCORE * num / scale.
3914 */
3915 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3916 }
3917
3918 static int diff_scoreopt_parse(const char *opt)
3919 {
3920 int opt1, opt2, cmd;
3921
3922 if (*opt++ != '-')
3923 return -1;
3924 cmd = *opt++;
3925 if (cmd == '-') {
3926 /* convert the long-form arguments into short-form versions */
3927 if (skip_prefix(opt, "break-rewrites", &opt)) {
3928 if (*opt == 0 || *opt++ == '=')
3929 cmd = 'B';
3930 } else if (skip_prefix(opt, "find-copies", &opt)) {
3931 if (*opt == 0 || *opt++ == '=')
3932 cmd = 'C';
3933 } else if (skip_prefix(opt, "find-renames", &opt)) {
3934 if (*opt == 0 || *opt++ == '=')
3935 cmd = 'M';
3936 }
3937 }
3938 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3939 return -1; /* that is not a -M, -C, or -B option */
3940
3941 opt1 = parse_rename_score(&opt);
3942 if (cmd != 'B')
3943 opt2 = 0;
3944 else {
3945 if (*opt == 0)
3946 opt2 = 0;
3947 else if (*opt != '/')
3948 return -1; /* we expect -B80/99 or -B80 */
3949 else {
3950 opt++;
3951 opt2 = parse_rename_score(&opt);
3952 }
3953 }
3954 if (*opt != 0)
3955 return -1;
3956 return opt1 | (opt2 << 16);
3957 }
3958
3959 struct diff_queue_struct diff_queued_diff;
3960
3961 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3962 {
3963 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
3964 queue->queue[queue->nr++] = dp;
3965 }
3966
3967 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3968 struct diff_filespec *one,
3969 struct diff_filespec *two)
3970 {
3971 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3972 dp->one = one;
3973 dp->two = two;
3974 if (queue)
3975 diff_q(queue, dp);
3976 return dp;
3977 }
3978
3979 void diff_free_filepair(struct diff_filepair *p)
3980 {
3981 free_filespec(p->one);
3982 free_filespec(p->two);
3983 free(p);
3984 }
3985
3986 /* This is different from find_unique_abbrev() in that
3987 * it stuffs the result with dots for alignment.
3988 */
3989 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3990 {
3991 int abblen;
3992 const char *abbrev;
3993 if (len == 40)
3994 return sha1_to_hex(sha1);
3995
3996 abbrev = find_unique_abbrev(sha1, len);
3997 abblen = strlen(abbrev);
3998 if (abblen < 37) {
3999 static char hex[41];
4000 if (len < abblen && abblen <= len + 2)
4001 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
4002 else
4003 sprintf(hex, "%s...", abbrev);
4004 return hex;
4005 }
4006 return sha1_to_hex(sha1);
4007 }
4008
4009 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4010 {
4011 int line_termination = opt->line_termination;
4012 int inter_name_termination = line_termination ? '\t' : '\0';
4013
4014 fprintf(opt->file, "%s", diff_line_prefix(opt));
4015 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4016 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4017 diff_unique_abbrev(p->one->sha1, opt->abbrev));
4018 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
4019 }
4020 if (p->score) {
4021 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4022 inter_name_termination);
4023 } else {
4024 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4025 }
4026
4027 if (p->status == DIFF_STATUS_COPIED ||
4028 p->status == DIFF_STATUS_RENAMED) {
4029 const char *name_a, *name_b;
4030 name_a = p->one->path;
4031 name_b = p->two->path;
4032 strip_prefix(opt->prefix_length, &name_a, &name_b);
4033 write_name_quoted(name_a, opt->file, inter_name_termination);
4034 write_name_quoted(name_b, opt->file, line_termination);
4035 } else {
4036 const char *name_a, *name_b;
4037 name_a = p->one->mode ? p->one->path : p->two->path;
4038 name_b = NULL;
4039 strip_prefix(opt->prefix_length, &name_a, &name_b);
4040 write_name_quoted(name_a, opt->file, line_termination);
4041 }
4042 }
4043
4044 int diff_unmodified_pair(struct diff_filepair *p)
4045 {
4046 /* This function is written stricter than necessary to support
4047 * the currently implemented transformers, but the idea is to
4048 * let transformers to produce diff_filepairs any way they want,
4049 * and filter and clean them up here before producing the output.
4050 */
4051 struct diff_filespec *one = p->one, *two = p->two;
4052
4053 if (DIFF_PAIR_UNMERGED(p))
4054 return 0; /* unmerged is interesting */
4055
4056 /* deletion, addition, mode or type change
4057 * and rename are all interesting.
4058 */
4059 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4060 DIFF_PAIR_MODE_CHANGED(p) ||
4061 strcmp(one->path, two->path))
4062 return 0;
4063
4064 /* both are valid and point at the same path. that is, we are
4065 * dealing with a change.
4066 */
4067 if (one->sha1_valid && two->sha1_valid &&
4068 !hashcmp(one->sha1, two->sha1) &&
4069 !one->dirty_submodule && !two->dirty_submodule)
4070 return 1; /* no change */
4071 if (!one->sha1_valid && !two->sha1_valid)
4072 return 1; /* both look at the same file on the filesystem. */
4073 return 0;
4074 }
4075
4076 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4077 {
4078 if (diff_unmodified_pair(p))
4079 return;
4080
4081 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4082 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4083 return; /* no tree diffs in patch format */
4084
4085 run_diff(p, o);
4086 }
4087
4088 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4089 struct diffstat_t *diffstat)
4090 {
4091 if (diff_unmodified_pair(p))
4092 return;
4093
4094 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4095 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4096 return; /* no useful stat for tree diffs */
4097
4098 run_diffstat(p, o, diffstat);
4099 }
4100
4101 static void diff_flush_checkdiff(struct diff_filepair *p,
4102 struct diff_options *o)
4103 {
4104 if (diff_unmodified_pair(p))
4105 return;
4106
4107 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4108 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4109 return; /* nothing to check in tree diffs */
4110
4111 run_checkdiff(p, o);
4112 }
4113
4114 int diff_queue_is_empty(void)
4115 {
4116 struct diff_queue_struct *q = &diff_queued_diff;
4117 int i;
4118 for (i = 0; i < q->nr; i++)
4119 if (!diff_unmodified_pair(q->queue[i]))
4120 return 0;
4121 return 1;
4122 }
4123
4124 #if DIFF_DEBUG
4125 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4126 {
4127 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4128 x, one ? one : "",
4129 s->path,
4130 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4131 s->mode,
4132 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4133 fprintf(stderr, "queue[%d] %s size %lu\n",
4134 x, one ? one : "",
4135 s->size);
4136 }
4137
4138 void diff_debug_filepair(const struct diff_filepair *p, int i)
4139 {
4140 diff_debug_filespec(p->one, i, "one");
4141 diff_debug_filespec(p->two, i, "two");
4142 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4143 p->score, p->status ? p->status : '?',
4144 p->one->rename_used, p->broken_pair);
4145 }
4146
4147 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4148 {
4149 int i;
4150 if (msg)
4151 fprintf(stderr, "%s\n", msg);
4152 fprintf(stderr, "q->nr = %d\n", q->nr);
4153 for (i = 0; i < q->nr; i++) {
4154 struct diff_filepair *p = q->queue[i];
4155 diff_debug_filepair(p, i);
4156 }
4157 }
4158 #endif
4159
4160 static void diff_resolve_rename_copy(void)
4161 {
4162 int i;
4163 struct diff_filepair *p;
4164 struct diff_queue_struct *q = &diff_queued_diff;
4165
4166 diff_debug_queue("resolve-rename-copy", q);
4167
4168 for (i = 0; i < q->nr; i++) {
4169 p = q->queue[i];
4170 p->status = 0; /* undecided */
4171 if (DIFF_PAIR_UNMERGED(p))
4172 p->status = DIFF_STATUS_UNMERGED;
4173 else if (!DIFF_FILE_VALID(p->one))
4174 p->status = DIFF_STATUS_ADDED;
4175 else if (!DIFF_FILE_VALID(p->two))
4176 p->status = DIFF_STATUS_DELETED;
4177 else if (DIFF_PAIR_TYPE_CHANGED(p))
4178 p->status = DIFF_STATUS_TYPE_CHANGED;
4179
4180 /* from this point on, we are dealing with a pair
4181 * whose both sides are valid and of the same type, i.e.
4182 * either in-place edit or rename/copy edit.
4183 */
4184 else if (DIFF_PAIR_RENAME(p)) {
4185 /*
4186 * A rename might have re-connected a broken
4187 * pair up, causing the pathnames to be the
4188 * same again. If so, that's not a rename at
4189 * all, just a modification..
4190 *
4191 * Otherwise, see if this source was used for
4192 * multiple renames, in which case we decrement
4193 * the count, and call it a copy.
4194 */
4195 if (!strcmp(p->one->path, p->two->path))
4196 p->status = DIFF_STATUS_MODIFIED;
4197 else if (--p->one->rename_used > 0)
4198 p->status = DIFF_STATUS_COPIED;
4199 else
4200 p->status = DIFF_STATUS_RENAMED;
4201 }
4202 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4203 p->one->mode != p->two->mode ||
4204 p->one->dirty_submodule ||
4205 p->two->dirty_submodule ||
4206 is_null_sha1(p->one->sha1))
4207 p->status = DIFF_STATUS_MODIFIED;
4208 else {
4209 /* This is a "no-change" entry and should not
4210 * happen anymore, but prepare for broken callers.
4211 */
4212 error("feeding unmodified %s to diffcore",
4213 p->one->path);
4214 p->status = DIFF_STATUS_UNKNOWN;
4215 }
4216 }
4217 diff_debug_queue("resolve-rename-copy done", q);
4218 }
4219
4220 static int check_pair_status(struct diff_filepair *p)
4221 {
4222 switch (p->status) {
4223 case DIFF_STATUS_UNKNOWN:
4224 return 0;
4225 case 0:
4226 die("internal error in diff-resolve-rename-copy");
4227 default:
4228 return 1;
4229 }
4230 }
4231
4232 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4233 {
4234 int fmt = opt->output_format;
4235
4236 if (fmt & DIFF_FORMAT_CHECKDIFF)
4237 diff_flush_checkdiff(p, opt);
4238 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4239 diff_flush_raw(p, opt);
4240 else if (fmt & DIFF_FORMAT_NAME) {
4241 const char *name_a, *name_b;
4242 name_a = p->two->path;
4243 name_b = NULL;
4244 strip_prefix(opt->prefix_length, &name_a, &name_b);
4245 write_name_quoted(name_a, opt->file, opt->line_termination);
4246 }
4247 }
4248
4249 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4250 {
4251 if (fs->mode)
4252 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4253 else
4254 fprintf(file, " %s ", newdelete);
4255 write_name_quoted(fs->path, file, '\n');
4256 }
4257
4258
4259 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4260 const char *line_prefix)
4261 {
4262 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4263 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4264 p->two->mode, show_name ? ' ' : '\n');
4265 if (show_name) {
4266 write_name_quoted(p->two->path, file, '\n');
4267 }
4268 }
4269 }
4270
4271 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4272 const char *line_prefix)
4273 {
4274 char *names = pprint_rename(p->one->path, p->two->path);
4275
4276 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4277 free(names);
4278 show_mode_change(file, p, 0, line_prefix);
4279 }
4280
4281 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4282 {
4283 FILE *file = opt->file;
4284 const char *line_prefix = diff_line_prefix(opt);
4285
4286 switch(p->status) {
4287 case DIFF_STATUS_DELETED:
4288 fputs(line_prefix, file);
4289 show_file_mode_name(file, "delete", p->one);
4290 break;
4291 case DIFF_STATUS_ADDED:
4292 fputs(line_prefix, file);
4293 show_file_mode_name(file, "create", p->two);
4294 break;
4295 case DIFF_STATUS_COPIED:
4296 fputs(line_prefix, file);
4297 show_rename_copy(file, "copy", p, line_prefix);
4298 break;
4299 case DIFF_STATUS_RENAMED:
4300 fputs(line_prefix, file);
4301 show_rename_copy(file, "rename", p, line_prefix);
4302 break;
4303 default:
4304 if (p->score) {
4305 fprintf(file, "%s rewrite ", line_prefix);
4306 write_name_quoted(p->two->path, file, ' ');
4307 fprintf(file, "(%d%%)\n", similarity_index(p));
4308 }
4309 show_mode_change(file, p, !p->score, line_prefix);
4310 break;
4311 }
4312 }
4313
4314 struct patch_id_t {
4315 git_SHA_CTX *ctx;
4316 int patchlen;
4317 };
4318
4319 static int remove_space(char *line, int len)
4320 {
4321 int i;
4322 char *dst = line;
4323 unsigned char c;
4324
4325 for (i = 0; i < len; i++)
4326 if (!isspace((c = line[i])))
4327 *dst++ = c;
4328
4329 return dst - line;
4330 }
4331
4332 static void patch_id_consume(void *priv, char *line, unsigned long len)
4333 {
4334 struct patch_id_t *data = priv;
4335 int new_len;
4336
4337 /* Ignore line numbers when computing the SHA1 of the patch */
4338 if (starts_with(line, "@@ -"))
4339 return;
4340
4341 new_len = remove_space(line, len);
4342
4343 git_SHA1_Update(data->ctx, line, new_len);
4344 data->patchlen += new_len;
4345 }
4346
4347 /* returns 0 upon success, and writes result into sha1 */
4348 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4349 {
4350 struct diff_queue_struct *q = &diff_queued_diff;
4351 int i;
4352 git_SHA_CTX ctx;
4353 struct patch_id_t data;
4354 char buffer[PATH_MAX * 4 + 20];
4355
4356 git_SHA1_Init(&ctx);
4357 memset(&data, 0, sizeof(struct patch_id_t));
4358 data.ctx = &ctx;
4359
4360 for (i = 0; i < q->nr; i++) {
4361 xpparam_t xpp;
4362 xdemitconf_t xecfg;
4363 mmfile_t mf1, mf2;
4364 struct diff_filepair *p = q->queue[i];
4365 int len1, len2;
4366
4367 memset(&xpp, 0, sizeof(xpp));
4368 memset(&xecfg, 0, sizeof(xecfg));
4369 if (p->status == 0)
4370 return error("internal diff status error");
4371 if (p->status == DIFF_STATUS_UNKNOWN)
4372 continue;
4373 if (diff_unmodified_pair(p))
4374 continue;
4375 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4376 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4377 continue;
4378 if (DIFF_PAIR_UNMERGED(p))
4379 continue;
4380
4381 diff_fill_sha1_info(p->one);
4382 diff_fill_sha1_info(p->two);
4383 if (fill_mmfile(&mf1, p->one) < 0 ||
4384 fill_mmfile(&mf2, p->two) < 0)
4385 return error("unable to read files to diff");
4386
4387 len1 = remove_space(p->one->path, strlen(p->one->path));
4388 len2 = remove_space(p->two->path, strlen(p->two->path));
4389 if (p->one->mode == 0)
4390 len1 = snprintf(buffer, sizeof(buffer),
4391 "diff--gita/%.*sb/%.*s"
4392 "newfilemode%06o"
4393 "---/dev/null"
4394 "+++b/%.*s",
4395 len1, p->one->path,
4396 len2, p->two->path,
4397 p->two->mode,
4398 len2, p->two->path);
4399 else if (p->two->mode == 0)
4400 len1 = snprintf(buffer, sizeof(buffer),
4401 "diff--gita/%.*sb/%.*s"
4402 "deletedfilemode%06o"
4403 "---a/%.*s"
4404 "+++/dev/null",
4405 len1, p->one->path,
4406 len2, p->two->path,
4407 p->one->mode,
4408 len1, p->one->path);
4409 else
4410 len1 = snprintf(buffer, sizeof(buffer),
4411 "diff--gita/%.*sb/%.*s"
4412 "---a/%.*s"
4413 "+++b/%.*s",
4414 len1, p->one->path,
4415 len2, p->two->path,
4416 len1, p->one->path,
4417 len2, p->two->path);
4418 git_SHA1_Update(&ctx, buffer, len1);
4419
4420 if (diff_filespec_is_binary(p->one) ||
4421 diff_filespec_is_binary(p->two)) {
4422 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4423 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4424 continue;
4425 }
4426
4427 xpp.flags = 0;
4428 xecfg.ctxlen = 3;
4429 xecfg.flags = 0;
4430 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4431 &xpp, &xecfg);
4432 }
4433
4434 git_SHA1_Final(sha1, &ctx);
4435 return 0;
4436 }
4437
4438 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4439 {
4440 struct diff_queue_struct *q = &diff_queued_diff;
4441 int i;
4442 int result = diff_get_patch_id(options, sha1);
4443
4444 for (i = 0; i < q->nr; i++)
4445 diff_free_filepair(q->queue[i]);
4446
4447 free(q->queue);
4448 DIFF_QUEUE_CLEAR(q);
4449
4450 return result;
4451 }
4452
4453 static int is_summary_empty(const struct diff_queue_struct *q)
4454 {
4455 int i;
4456
4457 for (i = 0; i < q->nr; i++) {
4458 const struct diff_filepair *p = q->queue[i];
4459
4460 switch (p->status) {
4461 case DIFF_STATUS_DELETED:
4462 case DIFF_STATUS_ADDED:
4463 case DIFF_STATUS_COPIED:
4464 case DIFF_STATUS_RENAMED:
4465 return 0;
4466 default:
4467 if (p->score)
4468 return 0;
4469 if (p->one->mode && p->two->mode &&
4470 p->one->mode != p->two->mode)
4471 return 0;
4472 break;
4473 }
4474 }
4475 return 1;
4476 }
4477
4478 static const char rename_limit_warning[] =
4479 "inexact rename detection was skipped due to too many files.";
4480
4481 static const char degrade_cc_to_c_warning[] =
4482 "only found copies from modified paths due to too many files.";
4483
4484 static const char rename_limit_advice[] =
4485 "you may want to set your %s variable to at least "
4486 "%d and retry the command.";
4487
4488 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4489 {
4490 if (degraded_cc)
4491 warning(degrade_cc_to_c_warning);
4492 else if (needed)
4493 warning(rename_limit_warning);
4494 else
4495 return;
4496 if (0 < needed && needed < 32767)
4497 warning(rename_limit_advice, varname, needed);
4498 }
4499
4500 void diff_flush(struct diff_options *options)
4501 {
4502 struct diff_queue_struct *q = &diff_queued_diff;
4503 int i, output_format = options->output_format;
4504 int separator = 0;
4505 int dirstat_by_line = 0;
4506
4507 /*
4508 * Order: raw, stat, summary, patch
4509 * or: name/name-status/checkdiff (other bits clear)
4510 */
4511 if (!q->nr)
4512 goto free_queue;
4513
4514 if (output_format & (DIFF_FORMAT_RAW |
4515 DIFF_FORMAT_NAME |
4516 DIFF_FORMAT_NAME_STATUS |
4517 DIFF_FORMAT_CHECKDIFF)) {
4518 for (i = 0; i < q->nr; i++) {
4519 struct diff_filepair *p = q->queue[i];
4520 if (check_pair_status(p))
4521 flush_one_pair(p, options);
4522 }
4523 separator++;
4524 }
4525
4526 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4527 dirstat_by_line = 1;
4528
4529 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4530 dirstat_by_line) {
4531 struct diffstat_t diffstat;
4532
4533 memset(&diffstat, 0, sizeof(struct diffstat_t));
4534 for (i = 0; i < q->nr; i++) {
4535 struct diff_filepair *p = q->queue[i];
4536 if (check_pair_status(p))
4537 diff_flush_stat(p, options, &diffstat);
4538 }
4539 if (output_format & DIFF_FORMAT_NUMSTAT)
4540 show_numstat(&diffstat, options);
4541 if (output_format & DIFF_FORMAT_DIFFSTAT)
4542 show_stats(&diffstat, options);
4543 if (output_format & DIFF_FORMAT_SHORTSTAT)
4544 show_shortstats(&diffstat, options);
4545 if (output_format & DIFF_FORMAT_DIRSTAT)
4546 show_dirstat_by_line(&diffstat, options);
4547 free_diffstat_info(&diffstat);
4548 separator++;
4549 }
4550 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4551 show_dirstat(options);
4552
4553 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4554 for (i = 0; i < q->nr; i++) {
4555 diff_summary(options, q->queue[i]);
4556 }
4557 separator++;
4558 }
4559
4560 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4561 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4562 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4563 /*
4564 * run diff_flush_patch for the exit status. setting
4565 * options->file to /dev/null should be safe, because we
4566 * aren't supposed to produce any output anyway.
4567 */
4568 if (options->close_file)
4569 fclose(options->file);
4570 options->file = fopen("/dev/null", "w");
4571 if (!options->file)
4572 die_errno("Could not open /dev/null");
4573 options->close_file = 1;
4574 for (i = 0; i < q->nr; i++) {
4575 struct diff_filepair *p = q->queue[i];
4576 if (check_pair_status(p))
4577 diff_flush_patch(p, options);
4578 if (options->found_changes)
4579 break;
4580 }
4581 }
4582
4583 if (output_format & DIFF_FORMAT_PATCH) {
4584 if (separator) {
4585 fprintf(options->file, "%s%c",
4586 diff_line_prefix(options),
4587 options->line_termination);
4588 if (options->stat_sep) {
4589 /* attach patch instead of inline */
4590 fputs(options->stat_sep, options->file);
4591 }
4592 }
4593
4594 for (i = 0; i < q->nr; i++) {
4595 struct diff_filepair *p = q->queue[i];
4596 if (check_pair_status(p))
4597 diff_flush_patch(p, options);
4598 }
4599 }
4600
4601 if (output_format & DIFF_FORMAT_CALLBACK)
4602 options->format_callback(q, options, options->format_callback_data);
4603
4604 for (i = 0; i < q->nr; i++)
4605 diff_free_filepair(q->queue[i]);
4606 free_queue:
4607 free(q->queue);
4608 DIFF_QUEUE_CLEAR(q);
4609 if (options->close_file)
4610 fclose(options->file);
4611
4612 /*
4613 * Report the content-level differences with HAS_CHANGES;
4614 * diff_addremove/diff_change does not set the bit when
4615 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4616 */
4617 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4618 if (options->found_changes)
4619 DIFF_OPT_SET(options, HAS_CHANGES);
4620 else
4621 DIFF_OPT_CLR(options, HAS_CHANGES);
4622 }
4623 }
4624
4625 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4626 {
4627 return (((p->status == DIFF_STATUS_MODIFIED) &&
4628 ((p->score &&
4629 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4630 (!p->score &&
4631 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4632 ((p->status != DIFF_STATUS_MODIFIED) &&
4633 filter_bit_tst(p->status, options)));
4634 }
4635
4636 static void diffcore_apply_filter(struct diff_options *options)
4637 {
4638 int i;
4639 struct diff_queue_struct *q = &diff_queued_diff;
4640 struct diff_queue_struct outq;
4641
4642 DIFF_QUEUE_CLEAR(&outq);
4643
4644 if (!options->filter)
4645 return;
4646
4647 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4648 int found;
4649 for (i = found = 0; !found && i < q->nr; i++) {
4650 if (match_filter(options, q->queue[i]))
4651 found++;
4652 }
4653 if (found)
4654 return;
4655
4656 /* otherwise we will clear the whole queue
4657 * by copying the empty outq at the end of this
4658 * function, but first clear the current entries
4659 * in the queue.
4660 */
4661 for (i = 0; i < q->nr; i++)
4662 diff_free_filepair(q->queue[i]);
4663 }
4664 else {
4665 /* Only the matching ones */
4666 for (i = 0; i < q->nr; i++) {
4667 struct diff_filepair *p = q->queue[i];
4668 if (match_filter(options, p))
4669 diff_q(&outq, p);
4670 else
4671 diff_free_filepair(p);
4672 }
4673 }
4674 free(q->queue);
4675 *q = outq;
4676 }
4677
4678 /* Check whether two filespecs with the same mode and size are identical */
4679 static int diff_filespec_is_identical(struct diff_filespec *one,
4680 struct diff_filespec *two)
4681 {
4682 if (S_ISGITLINK(one->mode))
4683 return 0;
4684 if (diff_populate_filespec(one, 0))
4685 return 0;
4686 if (diff_populate_filespec(two, 0))
4687 return 0;
4688 return !memcmp(one->data, two->data, one->size);
4689 }
4690
4691 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4692 {
4693 if (p->done_skip_stat_unmatch)
4694 return p->skip_stat_unmatch_result;
4695
4696 p->done_skip_stat_unmatch = 1;
4697 p->skip_stat_unmatch_result = 0;
4698 /*
4699 * 1. Entries that come from stat info dirtiness
4700 * always have both sides (iow, not create/delete),
4701 * one side of the object name is unknown, with
4702 * the same mode and size. Keep the ones that
4703 * do not match these criteria. They have real
4704 * differences.
4705 *
4706 * 2. At this point, the file is known to be modified,
4707 * with the same mode and size, and the object
4708 * name of one side is unknown. Need to inspect
4709 * the identical contents.
4710 */
4711 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4712 !DIFF_FILE_VALID(p->two) ||
4713 (p->one->sha1_valid && p->two->sha1_valid) ||
4714 (p->one->mode != p->two->mode) ||
4715 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
4716 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
4717 (p->one->size != p->two->size) ||
4718 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4719 p->skip_stat_unmatch_result = 1;
4720 return p->skip_stat_unmatch_result;
4721 }
4722
4723 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4724 {
4725 int i;
4726 struct diff_queue_struct *q = &diff_queued_diff;
4727 struct diff_queue_struct outq;
4728 DIFF_QUEUE_CLEAR(&outq);
4729
4730 for (i = 0; i < q->nr; i++) {
4731 struct diff_filepair *p = q->queue[i];
4732
4733 if (diff_filespec_check_stat_unmatch(p))
4734 diff_q(&outq, p);
4735 else {
4736 /*
4737 * The caller can subtract 1 from skip_stat_unmatch
4738 * to determine how many paths were dirty only
4739 * due to stat info mismatch.
4740 */
4741 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4742 diffopt->skip_stat_unmatch++;
4743 diff_free_filepair(p);
4744 }
4745 }
4746 free(q->queue);
4747 *q = outq;
4748 }
4749
4750 static int diffnamecmp(const void *a_, const void *b_)
4751 {
4752 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4753 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4754 const char *name_a, *name_b;
4755
4756 name_a = a->one ? a->one->path : a->two->path;
4757 name_b = b->one ? b->one->path : b->two->path;
4758 return strcmp(name_a, name_b);
4759 }
4760
4761 void diffcore_fix_diff_index(struct diff_options *options)
4762 {
4763 struct diff_queue_struct *q = &diff_queued_diff;
4764 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4765 }
4766
4767 void diffcore_std(struct diff_options *options)
4768 {
4769 /* NOTE please keep the following in sync with diff_tree_combined() */
4770 if (options->skip_stat_unmatch)
4771 diffcore_skip_stat_unmatch(options);
4772 if (!options->found_follow) {
4773 /* See try_to_follow_renames() in tree-diff.c */
4774 if (options->break_opt != -1)
4775 diffcore_break(options->break_opt);
4776 if (options->detect_rename)
4777 diffcore_rename(options);
4778 if (options->break_opt != -1)
4779 diffcore_merge_broken();
4780 }
4781 if (options->pickaxe)
4782 diffcore_pickaxe(options);
4783 if (options->orderfile)
4784 diffcore_order(options->orderfile);
4785 if (!options->found_follow)
4786 /* See try_to_follow_renames() in tree-diff.c */
4787 diff_resolve_rename_copy();
4788 diffcore_apply_filter(options);
4789
4790 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4791 DIFF_OPT_SET(options, HAS_CHANGES);
4792 else
4793 DIFF_OPT_CLR(options, HAS_CHANGES);
4794
4795 options->found_follow = 0;
4796 }
4797
4798 int diff_result_code(struct diff_options *opt, int status)
4799 {
4800 int result = 0;
4801
4802 diff_warn_rename_limit("diff.renameLimit",
4803 opt->needed_rename_limit,
4804 opt->degraded_cc_to_c);
4805 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4806 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4807 return status;
4808 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4809 DIFF_OPT_TST(opt, HAS_CHANGES))
4810 result |= 01;
4811 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4812 DIFF_OPT_TST(opt, CHECK_FAILED))
4813 result |= 02;
4814 return result;
4815 }
4816
4817 int diff_can_quit_early(struct diff_options *opt)
4818 {
4819 return (DIFF_OPT_TST(opt, QUICK) &&
4820 !opt->filter &&
4821 DIFF_OPT_TST(opt, HAS_CHANGES));
4822 }
4823
4824 /*
4825 * Shall changes to this submodule be ignored?
4826 *
4827 * Submodule changes can be configured to be ignored separately for each path,
4828 * but that configuration can be overridden from the command line.
4829 */
4830 static int is_submodule_ignored(const char *path, struct diff_options *options)
4831 {
4832 int ignored = 0;
4833 unsigned orig_flags = options->flags;
4834 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4835 set_diffopt_flags_from_submodule_config(options, path);
4836 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4837 ignored = 1;
4838 options->flags = orig_flags;
4839 return ignored;
4840 }
4841
4842 void diff_addremove(struct diff_options *options,
4843 int addremove, unsigned mode,
4844 const unsigned char *sha1,
4845 int sha1_valid,
4846 const char *concatpath, unsigned dirty_submodule)
4847 {
4848 struct diff_filespec *one, *two;
4849
4850 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4851 return;
4852
4853 /* This may look odd, but it is a preparation for
4854 * feeding "there are unchanged files which should
4855 * not produce diffs, but when you are doing copy
4856 * detection you would need them, so here they are"
4857 * entries to the diff-core. They will be prefixed
4858 * with something like '=' or '*' (I haven't decided
4859 * which but should not make any difference).
4860 * Feeding the same new and old to diff_change()
4861 * also has the same effect.
4862 * Before the final output happens, they are pruned after
4863 * merged into rename/copy pairs as appropriate.
4864 */
4865 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4866 addremove = (addremove == '+' ? '-' :
4867 addremove == '-' ? '+' : addremove);
4868
4869 if (options->prefix &&
4870 strncmp(concatpath, options->prefix, options->prefix_length))
4871 return;
4872
4873 one = alloc_filespec(concatpath);
4874 two = alloc_filespec(concatpath);
4875
4876 if (addremove != '+')
4877 fill_filespec(one, sha1, sha1_valid, mode);
4878 if (addremove != '-') {
4879 fill_filespec(two, sha1, sha1_valid, mode);
4880 two->dirty_submodule = dirty_submodule;
4881 }
4882
4883 diff_queue(&diff_queued_diff, one, two);
4884 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4885 DIFF_OPT_SET(options, HAS_CHANGES);
4886 }
4887
4888 void diff_change(struct diff_options *options,
4889 unsigned old_mode, unsigned new_mode,
4890 const unsigned char *old_sha1,
4891 const unsigned char *new_sha1,
4892 int old_sha1_valid, int new_sha1_valid,
4893 const char *concatpath,
4894 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4895 {
4896 struct diff_filespec *one, *two;
4897 struct diff_filepair *p;
4898
4899 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4900 is_submodule_ignored(concatpath, options))
4901 return;
4902
4903 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4904 unsigned tmp;
4905 const unsigned char *tmp_c;
4906 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4907 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4908 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4909 new_sha1_valid = tmp;
4910 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4911 new_dirty_submodule = tmp;
4912 }
4913
4914 if (options->prefix &&
4915 strncmp(concatpath, options->prefix, options->prefix_length))
4916 return;
4917
4918 one = alloc_filespec(concatpath);
4919 two = alloc_filespec(concatpath);
4920 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4921 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4922 one->dirty_submodule = old_dirty_submodule;
4923 two->dirty_submodule = new_dirty_submodule;
4924 p = diff_queue(&diff_queued_diff, one, two);
4925
4926 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4927 return;
4928
4929 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
4930 !diff_filespec_check_stat_unmatch(p))
4931 return;
4932
4933 DIFF_OPT_SET(options, HAS_CHANGES);
4934 }
4935
4936 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4937 {
4938 struct diff_filepair *pair;
4939 struct diff_filespec *one, *two;
4940
4941 if (options->prefix &&
4942 strncmp(path, options->prefix, options->prefix_length))
4943 return NULL;
4944
4945 one = alloc_filespec(path);
4946 two = alloc_filespec(path);
4947 pair = diff_queue(&diff_queued_diff, one, two);
4948 pair->is_unmerged = 1;
4949 return pair;
4950 }
4951
4952 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4953 size_t *outsize)
4954 {
4955 struct diff_tempfile *temp;
4956 const char *argv[3];
4957 const char **arg = argv;
4958 struct child_process child = CHILD_PROCESS_INIT;
4959 struct strbuf buf = STRBUF_INIT;
4960 int err = 0;
4961
4962 temp = prepare_temp_file(spec->path, spec);
4963 *arg++ = pgm;
4964 *arg++ = temp->name;
4965 *arg = NULL;
4966
4967 child.use_shell = 1;
4968 child.argv = argv;
4969 child.out = -1;
4970 if (start_command(&child)) {
4971 remove_tempfile();
4972 return NULL;
4973 }
4974
4975 if (strbuf_read(&buf, child.out, 0) < 0)
4976 err = error("error reading from textconv command '%s'", pgm);
4977 close(child.out);
4978
4979 if (finish_command(&child) || err) {
4980 strbuf_release(&buf);
4981 remove_tempfile();
4982 return NULL;
4983 }
4984 remove_tempfile();
4985
4986 return strbuf_detach(&buf, outsize);
4987 }
4988
4989 size_t fill_textconv(struct userdiff_driver *driver,
4990 struct diff_filespec *df,
4991 char **outbuf)
4992 {
4993 size_t size;
4994
4995 if (!driver || !driver->textconv) {
4996 if (!DIFF_FILE_VALID(df)) {
4997 *outbuf = "";
4998 return 0;
4999 }
5000 if (diff_populate_filespec(df, 0))
5001 die("unable to read files to diff");
5002 *outbuf = df->data;
5003 return df->size;
5004 }
5005
5006 if (driver->textconv_cache && df->sha1_valid) {
5007 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
5008 &size);
5009 if (*outbuf)
5010 return size;
5011 }
5012
5013 *outbuf = run_textconv(driver->textconv, df, &size);
5014 if (!*outbuf)
5015 die("unable to read files to diff");
5016
5017 if (driver->textconv_cache && df->sha1_valid) {
5018 /* ignore errors, as we might be in a readonly repository */
5019 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
5020 size);
5021 /*
5022 * we could save up changes and flush them all at the end,
5023 * but we would need an extra call after all diffing is done.
5024 * Since generating a cache entry is the slow path anyway,
5025 * this extra overhead probably isn't a big deal.
5026 */
5027 notes_cache_write(driver->textconv_cache);
5028 }
5029
5030 return size;
5031 }
5032
5033 void setup_diff_pager(struct diff_options *opt)
5034 {
5035 /*
5036 * If the user asked for our exit code, then either they want --quiet
5037 * or --exit-code. We should definitely not bother with a pager in the
5038 * former case, as we will generate no output. Since we still properly
5039 * report our exit code even when a pager is run, we _could_ run a
5040 * pager with --exit-code. But since we have not done so historically,
5041 * and because it is easy to find people oneline advising "git diff
5042 * --exit-code" in hooks and other scripts, we do not do so.
5043 */
5044 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5045 check_pager_config("diff") != 0)
5046 setup_pager();
5047 }
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