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run_external_diff: clean up error handling
[git/debian.git] / diff.c
blob174f146d0d89e03d4f603c0c2d7cd9153de14388
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18 #include "string-list.h"
19 #include "argv-array.h"
20
21 #ifdef NO_FAST_WORKING_DIRECTORY
22 #define FAST_WORKING_DIRECTORY 0
23 #else
24 #define FAST_WORKING_DIRECTORY 1
25 #endif
26
27 static int diff_detect_rename_default;
28 static int diff_rename_limit_default = 400;
29 static int diff_suppress_blank_empty;
30 static int diff_use_color_default = -1;
31 static int diff_context_default = 3;
32 static const char *diff_word_regex_cfg;
33 static const char *external_diff_cmd_cfg;
34 static const char *diff_order_file_cfg;
35 int diff_auto_refresh_index = 1;
36 static int diff_mnemonic_prefix;
37 static int diff_no_prefix;
38 static int diff_stat_graph_width;
39 static int diff_dirstat_permille_default = 30;
40 static struct diff_options default_diff_options;
41 static long diff_algorithm;
42
43 static char diff_colors[][COLOR_MAXLEN] = {
44 GIT_COLOR_RESET,
45 GIT_COLOR_NORMAL, /* PLAIN */
46 GIT_COLOR_BOLD, /* METAINFO */
47 GIT_COLOR_CYAN, /* FRAGINFO */
48 GIT_COLOR_RED, /* OLD */
49 GIT_COLOR_GREEN, /* NEW */
50 GIT_COLOR_YELLOW, /* COMMIT */
51 GIT_COLOR_BG_RED, /* WHITESPACE */
52 GIT_COLOR_NORMAL, /* FUNCINFO */
53 };
54
55 static int parse_diff_color_slot(const char *var, int ofs)
56 {
57 if (!strcasecmp(var+ofs, "plain"))
58 return DIFF_PLAIN;
59 if (!strcasecmp(var+ofs, "meta"))
60 return DIFF_METAINFO;
61 if (!strcasecmp(var+ofs, "frag"))
62 return DIFF_FRAGINFO;
63 if (!strcasecmp(var+ofs, "old"))
64 return DIFF_FILE_OLD;
65 if (!strcasecmp(var+ofs, "new"))
66 return DIFF_FILE_NEW;
67 if (!strcasecmp(var+ofs, "commit"))
68 return DIFF_COMMIT;
69 if (!strcasecmp(var+ofs, "whitespace"))
70 return DIFF_WHITESPACE;
71 if (!strcasecmp(var+ofs, "func"))
72 return DIFF_FUNCINFO;
73 return -1;
74 }
75
76 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
77 struct strbuf *errmsg)
78 {
79 char *params_copy = xstrdup(params_string);
80 struct string_list params = STRING_LIST_INIT_NODUP;
81 int ret = 0;
82 int i;
83
84 if (*params_copy)
85 string_list_split_in_place(&params, params_copy, ',', -1);
86 for (i = 0; i < params.nr; i++) {
87 const char *p = params.items[i].string;
88 if (!strcmp(p, "changes")) {
89 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
90 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
91 } else if (!strcmp(p, "lines")) {
92 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
93 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
94 } else if (!strcmp(p, "files")) {
95 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
96 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
97 } else if (!strcmp(p, "noncumulative")) {
98 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
99 } else if (!strcmp(p, "cumulative")) {
100 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
101 } else if (isdigit(*p)) {
102 char *end;
103 int permille = strtoul(p, &end, 10) * 10;
104 if (*end == '.' && isdigit(*++end)) {
105 /* only use first digit */
106 permille += *end - '0';
107 /* .. and ignore any further digits */
108 while (isdigit(*++end))
109 ; /* nothing */
110 }
111 if (!*end)
112 options->dirstat_permille = permille;
113 else {
114 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
115 p);
116 ret++;
117 }
118 } else {
119 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
120 ret++;
121 }
122
123 }
124 string_list_clear(&params, 0);
125 free(params_copy);
126 return ret;
127 }
128
129 static int parse_submodule_params(struct diff_options *options, const char *value)
130 {
131 if (!strcmp(value, "log"))
132 DIFF_OPT_SET(options, SUBMODULE_LOG);
133 else if (!strcmp(value, "short"))
134 DIFF_OPT_CLR(options, SUBMODULE_LOG);
135 else
136 return -1;
137 return 0;
138 }
139
140 static int git_config_rename(const char *var, const char *value)
141 {
142 if (!value)
143 return DIFF_DETECT_RENAME;
144 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
145 return DIFF_DETECT_COPY;
146 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
147 }
148
149 long parse_algorithm_value(const char *value)
150 {
151 if (!value)
152 return -1;
153 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
154 return 0;
155 else if (!strcasecmp(value, "minimal"))
156 return XDF_NEED_MINIMAL;
157 else if (!strcasecmp(value, "patience"))
158 return XDF_PATIENCE_DIFF;
159 else if (!strcasecmp(value, "histogram"))
160 return XDF_HISTOGRAM_DIFF;
161 return -1;
162 }
163
164 /*
165 * These are to give UI layer defaults.
166 * The core-level commands such as git-diff-files should
167 * never be affected by the setting of diff.renames
168 * the user happens to have in the configuration file.
169 */
170 int git_diff_ui_config(const char *var, const char *value, void *cb)
171 {
172 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
173 diff_use_color_default = git_config_colorbool(var, value);
174 return 0;
175 }
176 if (!strcmp(var, "diff.context")) {
177 diff_context_default = git_config_int(var, value);
178 if (diff_context_default < 0)
179 return -1;
180 return 0;
181 }
182 if (!strcmp(var, "diff.renames")) {
183 diff_detect_rename_default = git_config_rename(var, value);
184 return 0;
185 }
186 if (!strcmp(var, "diff.autorefreshindex")) {
187 diff_auto_refresh_index = git_config_bool(var, value);
188 return 0;
189 }
190 if (!strcmp(var, "diff.mnemonicprefix")) {
191 diff_mnemonic_prefix = git_config_bool(var, value);
192 return 0;
193 }
194 if (!strcmp(var, "diff.noprefix")) {
195 diff_no_prefix = git_config_bool(var, value);
196 return 0;
197 }
198 if (!strcmp(var, "diff.statgraphwidth")) {
199 diff_stat_graph_width = git_config_int(var, value);
200 return 0;
201 }
202 if (!strcmp(var, "diff.external"))
203 return git_config_string(&external_diff_cmd_cfg, var, value);
204 if (!strcmp(var, "diff.wordregex"))
205 return git_config_string(&diff_word_regex_cfg, var, value);
206 if (!strcmp(var, "diff.orderfile"))
207 return git_config_pathname(&diff_order_file_cfg, var, value);
208
209 if (!strcmp(var, "diff.ignoresubmodules"))
210 handle_ignore_submodules_arg(&default_diff_options, value);
211
212 if (!strcmp(var, "diff.submodule")) {
213 if (parse_submodule_params(&default_diff_options, value))
214 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
215 value);
216 return 0;
217 }
218
219 if (!strcmp(var, "diff.algorithm")) {
220 diff_algorithm = parse_algorithm_value(value);
221 if (diff_algorithm < 0)
222 return -1;
223 return 0;
224 }
225
226 if (git_color_config(var, value, cb) < 0)
227 return -1;
228
229 return git_diff_basic_config(var, value, cb);
230 }
231
232 int git_diff_basic_config(const char *var, const char *value, void *cb)
233 {
234 if (!strcmp(var, "diff.renamelimit")) {
235 diff_rename_limit_default = git_config_int(var, value);
236 return 0;
237 }
238
239 if (userdiff_config(var, value) < 0)
240 return -1;
241
242 if (starts_with(var, "diff.color.") || starts_with(var, "color.diff.")) {
243 int slot = parse_diff_color_slot(var, 11);
244 if (slot < 0)
245 return 0;
246 if (!value)
247 return config_error_nonbool(var);
248 color_parse(value, var, diff_colors[slot]);
249 return 0;
250 }
251
252 /* like GNU diff's --suppress-blank-empty option */
253 if (!strcmp(var, "diff.suppressblankempty") ||
254 /* for backwards compatibility */
255 !strcmp(var, "diff.suppress-blank-empty")) {
256 diff_suppress_blank_empty = git_config_bool(var, value);
257 return 0;
258 }
259
260 if (!strcmp(var, "diff.dirstat")) {
261 struct strbuf errmsg = STRBUF_INIT;
262 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
263 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
264 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
265 errmsg.buf);
266 strbuf_release(&errmsg);
267 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
268 return 0;
269 }
270
271 if (starts_with(var, "submodule."))
272 return parse_submodule_config_option(var, value);
273
274 return git_default_config(var, value, cb);
275 }
276
277 static char *quote_two(const char *one, const char *two)
278 {
279 int need_one = quote_c_style(one, NULL, NULL, 1);
280 int need_two = quote_c_style(two, NULL, NULL, 1);
281 struct strbuf res = STRBUF_INIT;
282
283 if (need_one + need_two) {
284 strbuf_addch(&res, '"');
285 quote_c_style(one, &res, NULL, 1);
286 quote_c_style(two, &res, NULL, 1);
287 strbuf_addch(&res, '"');
288 } else {
289 strbuf_addstr(&res, one);
290 strbuf_addstr(&res, two);
291 }
292 return strbuf_detach(&res, NULL);
293 }
294
295 static const char *external_diff(void)
296 {
297 static const char *external_diff_cmd = NULL;
298 static int done_preparing = 0;
299
300 if (done_preparing)
301 return external_diff_cmd;
302 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
303 if (!external_diff_cmd)
304 external_diff_cmd = external_diff_cmd_cfg;
305 done_preparing = 1;
306 return external_diff_cmd;
307 }
308
309 static struct diff_tempfile {
310 const char *name; /* filename external diff should read from */
311 char hex[41];
312 char mode[10];
313 char tmp_path[PATH_MAX];
314 } diff_temp[2];
315
316 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
317
318 struct emit_callback {
319 int color_diff;
320 unsigned ws_rule;
321 int blank_at_eof_in_preimage;
322 int blank_at_eof_in_postimage;
323 int lno_in_preimage;
324 int lno_in_postimage;
325 sane_truncate_fn truncate;
326 const char **label_path;
327 struct diff_words_data *diff_words;
328 struct diff_options *opt;
329 int *found_changesp;
330 struct strbuf *header;
331 };
332
333 static int count_lines(const char *data, int size)
334 {
335 int count, ch, completely_empty = 1, nl_just_seen = 0;
336 count = 0;
337 while (0 < size--) {
338 ch = *data++;
339 if (ch == '\n') {
340 count++;
341 nl_just_seen = 1;
342 completely_empty = 0;
343 }
344 else {
345 nl_just_seen = 0;
346 completely_empty = 0;
347 }
348 }
349 if (completely_empty)
350 return 0;
351 if (!nl_just_seen)
352 count++; /* no trailing newline */
353 return count;
354 }
355
356 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
357 {
358 if (!DIFF_FILE_VALID(one)) {
359 mf->ptr = (char *)""; /* does not matter */
360 mf->size = 0;
361 return 0;
362 }
363 else if (diff_populate_filespec(one, 0))
364 return -1;
365
366 mf->ptr = one->data;
367 mf->size = one->size;
368 return 0;
369 }
370
371 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
372 static unsigned long diff_filespec_size(struct diff_filespec *one)
373 {
374 if (!DIFF_FILE_VALID(one))
375 return 0;
376 diff_populate_filespec(one, 1);
377 return one->size;
378 }
379
380 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
381 {
382 char *ptr = mf->ptr;
383 long size = mf->size;
384 int cnt = 0;
385
386 if (!size)
387 return cnt;
388 ptr += size - 1; /* pointing at the very end */
389 if (*ptr != '\n')
390 ; /* incomplete line */
391 else
392 ptr--; /* skip the last LF */
393 while (mf->ptr < ptr) {
394 char *prev_eol;
395 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
396 if (*prev_eol == '\n')
397 break;
398 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
399 break;
400 cnt++;
401 ptr = prev_eol - 1;
402 }
403 return cnt;
404 }
405
406 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
407 struct emit_callback *ecbdata)
408 {
409 int l1, l2, at;
410 unsigned ws_rule = ecbdata->ws_rule;
411 l1 = count_trailing_blank(mf1, ws_rule);
412 l2 = count_trailing_blank(mf2, ws_rule);
413 if (l2 <= l1) {
414 ecbdata->blank_at_eof_in_preimage = 0;
415 ecbdata->blank_at_eof_in_postimage = 0;
416 return;
417 }
418 at = count_lines(mf1->ptr, mf1->size);
419 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
420
421 at = count_lines(mf2->ptr, mf2->size);
422 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
423 }
424
425 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
426 int first, const char *line, int len)
427 {
428 int has_trailing_newline, has_trailing_carriage_return;
429 int nofirst;
430 FILE *file = o->file;
431
432 fputs(diff_line_prefix(o), file);
433
434 if (len == 0) {
435 has_trailing_newline = (first == '\n');
436 has_trailing_carriage_return = (!has_trailing_newline &&
437 (first == '\r'));
438 nofirst = has_trailing_newline || has_trailing_carriage_return;
439 } else {
440 has_trailing_newline = (len > 0 && line[len-1] == '\n');
441 if (has_trailing_newline)
442 len--;
443 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
444 if (has_trailing_carriage_return)
445 len--;
446 nofirst = 0;
447 }
448
449 if (len || !nofirst) {
450 fputs(set, file);
451 if (!nofirst)
452 fputc(first, file);
453 fwrite(line, len, 1, file);
454 fputs(reset, file);
455 }
456 if (has_trailing_carriage_return)
457 fputc('\r', file);
458 if (has_trailing_newline)
459 fputc('\n', file);
460 }
461
462 static void emit_line(struct diff_options *o, const char *set, const char *reset,
463 const char *line, int len)
464 {
465 emit_line_0(o, set, reset, line[0], line+1, len-1);
466 }
467
468 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
469 {
470 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
471 ecbdata->blank_at_eof_in_preimage &&
472 ecbdata->blank_at_eof_in_postimage &&
473 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
474 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
475 return 0;
476 return ws_blank_line(line, len, ecbdata->ws_rule);
477 }
478
479 static void emit_add_line(const char *reset,
480 struct emit_callback *ecbdata,
481 const char *line, int len)
482 {
483 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
484 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
485
486 if (!*ws)
487 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
488 else if (new_blank_line_at_eof(ecbdata, line, len))
489 /* Blank line at EOF - paint '+' as well */
490 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
491 else {
492 /* Emit just the prefix, then the rest. */
493 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
494 ws_check_emit(line, len, ecbdata->ws_rule,
495 ecbdata->opt->file, set, reset, ws);
496 }
497 }
498
499 static void emit_hunk_header(struct emit_callback *ecbdata,
500 const char *line, int len)
501 {
502 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
503 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
504 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
505 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
506 static const char atat[2] = { '@', '@' };
507 const char *cp, *ep;
508 struct strbuf msgbuf = STRBUF_INIT;
509 int org_len = len;
510 int i = 1;
511
512 /*
513 * As a hunk header must begin with "@@ -<old>, +<new> @@",
514 * it always is at least 10 bytes long.
515 */
516 if (len < 10 ||
517 memcmp(line, atat, 2) ||
518 !(ep = memmem(line + 2, len - 2, atat, 2))) {
519 emit_line(ecbdata->opt, plain, reset, line, len);
520 return;
521 }
522 ep += 2; /* skip over @@ */
523
524 /* The hunk header in fraginfo color */
525 strbuf_add(&msgbuf, frag, strlen(frag));
526 strbuf_add(&msgbuf, line, ep - line);
527 strbuf_add(&msgbuf, reset, strlen(reset));
528
529 /*
530 * trailing "\r\n"
531 */
532 for ( ; i < 3; i++)
533 if (line[len - i] == '\r' || line[len - i] == '\n')
534 len--;
535
536 /* blank before the func header */
537 for (cp = ep; ep - line < len; ep++)
538 if (*ep != ' ' && *ep != '\t')
539 break;
540 if (ep != cp) {
541 strbuf_add(&msgbuf, plain, strlen(plain));
542 strbuf_add(&msgbuf, cp, ep - cp);
543 strbuf_add(&msgbuf, reset, strlen(reset));
544 }
545
546 if (ep < line + len) {
547 strbuf_add(&msgbuf, func, strlen(func));
548 strbuf_add(&msgbuf, ep, line + len - ep);
549 strbuf_add(&msgbuf, reset, strlen(reset));
550 }
551
552 strbuf_add(&msgbuf, line + len, org_len - len);
553 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
554 strbuf_release(&msgbuf);
555 }
556
557 static struct diff_tempfile *claim_diff_tempfile(void) {
558 int i;
559 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
560 if (!diff_temp[i].name)
561 return diff_temp + i;
562 die("BUG: diff is failing to clean up its tempfiles");
563 }
564
565 static int remove_tempfile_installed;
566
567 static void remove_tempfile(void)
568 {
569 int i;
570 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
571 if (diff_temp[i].name == diff_temp[i].tmp_path)
572 unlink_or_warn(diff_temp[i].name);
573 diff_temp[i].name = NULL;
574 }
575 }
576
577 static void remove_tempfile_on_signal(int signo)
578 {
579 remove_tempfile();
580 sigchain_pop(signo);
581 raise(signo);
582 }
583
584 static void print_line_count(FILE *file, int count)
585 {
586 switch (count) {
587 case 0:
588 fprintf(file, "0,0");
589 break;
590 case 1:
591 fprintf(file, "1");
592 break;
593 default:
594 fprintf(file, "1,%d", count);
595 break;
596 }
597 }
598
599 static void emit_rewrite_lines(struct emit_callback *ecb,
600 int prefix, const char *data, int size)
601 {
602 const char *endp = NULL;
603 static const char *nneof = " No newline at end of file\n";
604 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
605 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
606
607 while (0 < size) {
608 int len;
609
610 endp = memchr(data, '\n', size);
611 len = endp ? (endp - data + 1) : size;
612 if (prefix != '+') {
613 ecb->lno_in_preimage++;
614 emit_line_0(ecb->opt, old, reset, '-',
615 data, len);
616 } else {
617 ecb->lno_in_postimage++;
618 emit_add_line(reset, ecb, data, len);
619 }
620 size -= len;
621 data += len;
622 }
623 if (!endp) {
624 const char *plain = diff_get_color(ecb->color_diff,
625 DIFF_PLAIN);
626 putc('\n', ecb->opt->file);
627 emit_line_0(ecb->opt, plain, reset, '\\',
628 nneof, strlen(nneof));
629 }
630 }
631
632 static void emit_rewrite_diff(const char *name_a,
633 const char *name_b,
634 struct diff_filespec *one,
635 struct diff_filespec *two,
636 struct userdiff_driver *textconv_one,
637 struct userdiff_driver *textconv_two,
638 struct diff_options *o)
639 {
640 int lc_a, lc_b;
641 const char *name_a_tab, *name_b_tab;
642 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
643 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
644 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
645 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
646 const char *a_prefix, *b_prefix;
647 char *data_one, *data_two;
648 size_t size_one, size_two;
649 struct emit_callback ecbdata;
650 const char *line_prefix = diff_line_prefix(o);
651
652 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
653 a_prefix = o->b_prefix;
654 b_prefix = o->a_prefix;
655 } else {
656 a_prefix = o->a_prefix;
657 b_prefix = o->b_prefix;
658 }
659
660 name_a += (*name_a == '/');
661 name_b += (*name_b == '/');
662 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
663 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
664
665 strbuf_reset(&a_name);
666 strbuf_reset(&b_name);
667 quote_two_c_style(&a_name, a_prefix, name_a, 0);
668 quote_two_c_style(&b_name, b_prefix, name_b, 0);
669
670 size_one = fill_textconv(textconv_one, one, &data_one);
671 size_two = fill_textconv(textconv_two, two, &data_two);
672
673 memset(&ecbdata, 0, sizeof(ecbdata));
674 ecbdata.color_diff = want_color(o->use_color);
675 ecbdata.found_changesp = &o->found_changes;
676 ecbdata.ws_rule = whitespace_rule(name_b);
677 ecbdata.opt = o;
678 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
679 mmfile_t mf1, mf2;
680 mf1.ptr = (char *)data_one;
681 mf2.ptr = (char *)data_two;
682 mf1.size = size_one;
683 mf2.size = size_two;
684 check_blank_at_eof(&mf1, &mf2, &ecbdata);
685 }
686 ecbdata.lno_in_preimage = 1;
687 ecbdata.lno_in_postimage = 1;
688
689 lc_a = count_lines(data_one, size_one);
690 lc_b = count_lines(data_two, size_two);
691 fprintf(o->file,
692 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
693 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
694 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
695 line_prefix, fraginfo);
696 if (!o->irreversible_delete)
697 print_line_count(o->file, lc_a);
698 else
699 fprintf(o->file, "?,?");
700 fprintf(o->file, " +");
701 print_line_count(o->file, lc_b);
702 fprintf(o->file, " @@%s\n", reset);
703 if (lc_a && !o->irreversible_delete)
704 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
705 if (lc_b)
706 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
707 if (textconv_one)
708 free((char *)data_one);
709 if (textconv_two)
710 free((char *)data_two);
711 }
712
713 struct diff_words_buffer {
714 mmfile_t text;
715 long alloc;
716 struct diff_words_orig {
717 const char *begin, *end;
718 } *orig;
719 int orig_nr, orig_alloc;
720 };
721
722 static void diff_words_append(char *line, unsigned long len,
723 struct diff_words_buffer *buffer)
724 {
725 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
726 line++;
727 len--;
728 memcpy(buffer->text.ptr + buffer->text.size, line, len);
729 buffer->text.size += len;
730 buffer->text.ptr[buffer->text.size] = '\0';
731 }
732
733 struct diff_words_style_elem {
734 const char *prefix;
735 const char *suffix;
736 const char *color; /* NULL; filled in by the setup code if
737 * color is enabled */
738 };
739
740 struct diff_words_style {
741 enum diff_words_type type;
742 struct diff_words_style_elem new, old, ctx;
743 const char *newline;
744 };
745
746 static struct diff_words_style diff_words_styles[] = {
747 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
748 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
749 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
750 };
751
752 struct diff_words_data {
753 struct diff_words_buffer minus, plus;
754 const char *current_plus;
755 int last_minus;
756 struct diff_options *opt;
757 regex_t *word_regex;
758 enum diff_words_type type;
759 struct diff_words_style *style;
760 };
761
762 static int fn_out_diff_words_write_helper(FILE *fp,
763 struct diff_words_style_elem *st_el,
764 const char *newline,
765 size_t count, const char *buf,
766 const char *line_prefix)
767 {
768 int print = 0;
769
770 while (count) {
771 char *p = memchr(buf, '\n', count);
772 if (print)
773 fputs(line_prefix, fp);
774 if (p != buf) {
775 if (st_el->color && fputs(st_el->color, fp) < 0)
776 return -1;
777 if (fputs(st_el->prefix, fp) < 0 ||
778 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
779 fputs(st_el->suffix, fp) < 0)
780 return -1;
781 if (st_el->color && *st_el->color
782 && fputs(GIT_COLOR_RESET, fp) < 0)
783 return -1;
784 }
785 if (!p)
786 return 0;
787 if (fputs(newline, fp) < 0)
788 return -1;
789 count -= p + 1 - buf;
790 buf = p + 1;
791 print = 1;
792 }
793 return 0;
794 }
795
796 /*
797 * '--color-words' algorithm can be described as:
798 *
799 * 1. collect a the minus/plus lines of a diff hunk, divided into
800 * minus-lines and plus-lines;
801 *
802 * 2. break both minus-lines and plus-lines into words and
803 * place them into two mmfile_t with one word for each line;
804 *
805 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
806 *
807 * And for the common parts of the both file, we output the plus side text.
808 * diff_words->current_plus is used to trace the current position of the plus file
809 * which printed. diff_words->last_minus is used to trace the last minus word
810 * printed.
811 *
812 * For '--graph' to work with '--color-words', we need to output the graph prefix
813 * on each line of color words output. Generally, there are two conditions on
814 * which we should output the prefix.
815 *
816 * 1. diff_words->last_minus == 0 &&
817 * diff_words->current_plus == diff_words->plus.text.ptr
818 *
819 * that is: the plus text must start as a new line, and if there is no minus
820 * word printed, a graph prefix must be printed.
821 *
822 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
823 * *(diff_words->current_plus - 1) == '\n'
824 *
825 * that is: a graph prefix must be printed following a '\n'
826 */
827 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
828 {
829 if ((diff_words->last_minus == 0 &&
830 diff_words->current_plus == diff_words->plus.text.ptr) ||
831 (diff_words->current_plus > diff_words->plus.text.ptr &&
832 *(diff_words->current_plus - 1) == '\n')) {
833 return 1;
834 } else {
835 return 0;
836 }
837 }
838
839 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
840 {
841 struct diff_words_data *diff_words = priv;
842 struct diff_words_style *style = diff_words->style;
843 int minus_first, minus_len, plus_first, plus_len;
844 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
845 struct diff_options *opt = diff_words->opt;
846 const char *line_prefix;
847
848 if (line[0] != '@' || parse_hunk_header(line, len,
849 &minus_first, &minus_len, &plus_first, &plus_len))
850 return;
851
852 assert(opt);
853 line_prefix = diff_line_prefix(opt);
854
855 /* POSIX requires that first be decremented by one if len == 0... */
856 if (minus_len) {
857 minus_begin = diff_words->minus.orig[minus_first].begin;
858 minus_end =
859 diff_words->minus.orig[minus_first + minus_len - 1].end;
860 } else
861 minus_begin = minus_end =
862 diff_words->minus.orig[minus_first].end;
863
864 if (plus_len) {
865 plus_begin = diff_words->plus.orig[plus_first].begin;
866 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
867 } else
868 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
869
870 if (color_words_output_graph_prefix(diff_words)) {
871 fputs(line_prefix, diff_words->opt->file);
872 }
873 if (diff_words->current_plus != plus_begin) {
874 fn_out_diff_words_write_helper(diff_words->opt->file,
875 &style->ctx, style->newline,
876 plus_begin - diff_words->current_plus,
877 diff_words->current_plus, line_prefix);
878 if (*(plus_begin - 1) == '\n')
879 fputs(line_prefix, diff_words->opt->file);
880 }
881 if (minus_begin != minus_end) {
882 fn_out_diff_words_write_helper(diff_words->opt->file,
883 &style->old, style->newline,
884 minus_end - minus_begin, minus_begin,
885 line_prefix);
886 }
887 if (plus_begin != plus_end) {
888 fn_out_diff_words_write_helper(diff_words->opt->file,
889 &style->new, style->newline,
890 plus_end - plus_begin, plus_begin,
891 line_prefix);
892 }
893
894 diff_words->current_plus = plus_end;
895 diff_words->last_minus = minus_first;
896 }
897
898 /* This function starts looking at *begin, and returns 0 iff a word was found. */
899 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
900 int *begin, int *end)
901 {
902 if (word_regex && *begin < buffer->size) {
903 regmatch_t match[1];
904 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
905 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
906 '\n', match[0].rm_eo - match[0].rm_so);
907 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
908 *begin += match[0].rm_so;
909 return *begin >= *end;
910 }
911 return -1;
912 }
913
914 /* find the next word */
915 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
916 (*begin)++;
917 if (*begin >= buffer->size)
918 return -1;
919
920 /* find the end of the word */
921 *end = *begin + 1;
922 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
923 (*end)++;
924
925 return 0;
926 }
927
928 /*
929 * This function splits the words in buffer->text, stores the list with
930 * newline separator into out, and saves the offsets of the original words
931 * in buffer->orig.
932 */
933 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
934 regex_t *word_regex)
935 {
936 int i, j;
937 long alloc = 0;
938
939 out->size = 0;
940 out->ptr = NULL;
941
942 /* fake an empty "0th" word */
943 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
944 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
945 buffer->orig_nr = 1;
946
947 for (i = 0; i < buffer->text.size; i++) {
948 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
949 return;
950
951 /* store original boundaries */
952 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
953 buffer->orig_alloc);
954 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
955 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
956 buffer->orig_nr++;
957
958 /* store one word */
959 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
960 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
961 out->ptr[out->size + j - i] = '\n';
962 out->size += j - i + 1;
963
964 i = j - 1;
965 }
966 }
967
968 /* this executes the word diff on the accumulated buffers */
969 static void diff_words_show(struct diff_words_data *diff_words)
970 {
971 xpparam_t xpp;
972 xdemitconf_t xecfg;
973 mmfile_t minus, plus;
974 struct diff_words_style *style = diff_words->style;
975
976 struct diff_options *opt = diff_words->opt;
977 const char *line_prefix;
978
979 assert(opt);
980 line_prefix = diff_line_prefix(opt);
981
982 /* special case: only removal */
983 if (!diff_words->plus.text.size) {
984 fputs(line_prefix, diff_words->opt->file);
985 fn_out_diff_words_write_helper(diff_words->opt->file,
986 &style->old, style->newline,
987 diff_words->minus.text.size,
988 diff_words->minus.text.ptr, line_prefix);
989 diff_words->minus.text.size = 0;
990 return;
991 }
992
993 diff_words->current_plus = diff_words->plus.text.ptr;
994 diff_words->last_minus = 0;
995
996 memset(&xpp, 0, sizeof(xpp));
997 memset(&xecfg, 0, sizeof(xecfg));
998 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
999 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1000 xpp.flags = 0;
1001 /* as only the hunk header will be parsed, we need a 0-context */
1002 xecfg.ctxlen = 0;
1003 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1004 &xpp, &xecfg);
1005 free(minus.ptr);
1006 free(plus.ptr);
1007 if (diff_words->current_plus != diff_words->plus.text.ptr +
1008 diff_words->plus.text.size) {
1009 if (color_words_output_graph_prefix(diff_words))
1010 fputs(line_prefix, diff_words->opt->file);
1011 fn_out_diff_words_write_helper(diff_words->opt->file,
1012 &style->ctx, style->newline,
1013 diff_words->plus.text.ptr + diff_words->plus.text.size
1014 - diff_words->current_plus, diff_words->current_plus,
1015 line_prefix);
1016 }
1017 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1018 }
1019
1020 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1021 static void diff_words_flush(struct emit_callback *ecbdata)
1022 {
1023 if (ecbdata->diff_words->minus.text.size ||
1024 ecbdata->diff_words->plus.text.size)
1025 diff_words_show(ecbdata->diff_words);
1026 }
1027
1028 static void diff_filespec_load_driver(struct diff_filespec *one)
1029 {
1030 /* Use already-loaded driver */
1031 if (one->driver)
1032 return;
1033
1034 if (S_ISREG(one->mode))
1035 one->driver = userdiff_find_by_path(one->path);
1036
1037 /* Fallback to default settings */
1038 if (!one->driver)
1039 one->driver = userdiff_find_by_name("default");
1040 }
1041
1042 static const char *userdiff_word_regex(struct diff_filespec *one)
1043 {
1044 diff_filespec_load_driver(one);
1045 return one->driver->word_regex;
1046 }
1047
1048 static void init_diff_words_data(struct emit_callback *ecbdata,
1049 struct diff_options *orig_opts,
1050 struct diff_filespec *one,
1051 struct diff_filespec *two)
1052 {
1053 int i;
1054 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1055 memcpy(o, orig_opts, sizeof(struct diff_options));
1056
1057 ecbdata->diff_words =
1058 xcalloc(1, sizeof(struct diff_words_data));
1059 ecbdata->diff_words->type = o->word_diff;
1060 ecbdata->diff_words->opt = o;
1061 if (!o->word_regex)
1062 o->word_regex = userdiff_word_regex(one);
1063 if (!o->word_regex)
1064 o->word_regex = userdiff_word_regex(two);
1065 if (!o->word_regex)
1066 o->word_regex = diff_word_regex_cfg;
1067 if (o->word_regex) {
1068 ecbdata->diff_words->word_regex = (regex_t *)
1069 xmalloc(sizeof(regex_t));
1070 if (regcomp(ecbdata->diff_words->word_regex,
1071 o->word_regex,
1072 REG_EXTENDED | REG_NEWLINE))
1073 die ("Invalid regular expression: %s",
1074 o->word_regex);
1075 }
1076 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1077 if (o->word_diff == diff_words_styles[i].type) {
1078 ecbdata->diff_words->style =
1079 &diff_words_styles[i];
1080 break;
1081 }
1082 }
1083 if (want_color(o->use_color)) {
1084 struct diff_words_style *st = ecbdata->diff_words->style;
1085 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1086 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1087 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1088 }
1089 }
1090
1091 static void free_diff_words_data(struct emit_callback *ecbdata)
1092 {
1093 if (ecbdata->diff_words) {
1094 diff_words_flush(ecbdata);
1095 free (ecbdata->diff_words->opt);
1096 free (ecbdata->diff_words->minus.text.ptr);
1097 free (ecbdata->diff_words->minus.orig);
1098 free (ecbdata->diff_words->plus.text.ptr);
1099 free (ecbdata->diff_words->plus.orig);
1100 if (ecbdata->diff_words->word_regex) {
1101 regfree(ecbdata->diff_words->word_regex);
1102 free(ecbdata->diff_words->word_regex);
1103 }
1104 free(ecbdata->diff_words);
1105 ecbdata->diff_words = NULL;
1106 }
1107 }
1108
1109 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1110 {
1111 if (want_color(diff_use_color))
1112 return diff_colors[ix];
1113 return "";
1114 }
1115
1116 const char *diff_line_prefix(struct diff_options *opt)
1117 {
1118 struct strbuf *msgbuf;
1119 if (!opt->output_prefix)
1120 return "";
1121
1122 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1123 return msgbuf->buf;
1124 }
1125
1126 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1127 {
1128 const char *cp;
1129 unsigned long allot;
1130 size_t l = len;
1131
1132 if (ecb->truncate)
1133 return ecb->truncate(line, len);
1134 cp = line;
1135 allot = l;
1136 while (0 < l) {
1137 (void) utf8_width(&cp, &l);
1138 if (!cp)
1139 break; /* truncated in the middle? */
1140 }
1141 return allot - l;
1142 }
1143
1144 static void find_lno(const char *line, struct emit_callback *ecbdata)
1145 {
1146 const char *p;
1147 ecbdata->lno_in_preimage = 0;
1148 ecbdata->lno_in_postimage = 0;
1149 p = strchr(line, '-');
1150 if (!p)
1151 return; /* cannot happen */
1152 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1153 p = strchr(p, '+');
1154 if (!p)
1155 return; /* cannot happen */
1156 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1157 }
1158
1159 static void fn_out_consume(void *priv, char *line, unsigned long len)
1160 {
1161 struct emit_callback *ecbdata = priv;
1162 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1163 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1164 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1165 struct diff_options *o = ecbdata->opt;
1166 const char *line_prefix = diff_line_prefix(o);
1167
1168 if (ecbdata->header) {
1169 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1170 strbuf_reset(ecbdata->header);
1171 ecbdata->header = NULL;
1172 }
1173 *(ecbdata->found_changesp) = 1;
1174
1175 if (ecbdata->label_path[0]) {
1176 const char *name_a_tab, *name_b_tab;
1177
1178 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1179 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1180
1181 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1182 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1183 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1184 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1185 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1186 }
1187
1188 if (diff_suppress_blank_empty
1189 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1190 line[0] = '\n';
1191 len = 1;
1192 }
1193
1194 if (line[0] == '@') {
1195 if (ecbdata->diff_words)
1196 diff_words_flush(ecbdata);
1197 len = sane_truncate_line(ecbdata, line, len);
1198 find_lno(line, ecbdata);
1199 emit_hunk_header(ecbdata, line, len);
1200 if (line[len-1] != '\n')
1201 putc('\n', ecbdata->opt->file);
1202 return;
1203 }
1204
1205 if (len < 1) {
1206 emit_line(ecbdata->opt, reset, reset, line, len);
1207 if (ecbdata->diff_words
1208 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1209 fputs("~\n", ecbdata->opt->file);
1210 return;
1211 }
1212
1213 if (ecbdata->diff_words) {
1214 if (line[0] == '-') {
1215 diff_words_append(line, len,
1216 &ecbdata->diff_words->minus);
1217 return;
1218 } else if (line[0] == '+') {
1219 diff_words_append(line, len,
1220 &ecbdata->diff_words->plus);
1221 return;
1222 } else if (starts_with(line, "\\ ")) {
1223 /*
1224 * Eat the "no newline at eof" marker as if we
1225 * saw a "+" or "-" line with nothing on it,
1226 * and return without diff_words_flush() to
1227 * defer processing. If this is the end of
1228 * preimage, more "+" lines may come after it.
1229 */
1230 return;
1231 }
1232 diff_words_flush(ecbdata);
1233 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1234 emit_line(ecbdata->opt, plain, reset, line, len);
1235 fputs("~\n", ecbdata->opt->file);
1236 } else {
1237 /*
1238 * Skip the prefix character, if any. With
1239 * diff_suppress_blank_empty, there may be
1240 * none.
1241 */
1242 if (line[0] != '\n') {
1243 line++;
1244 len--;
1245 }
1246 emit_line(ecbdata->opt, plain, reset, line, len);
1247 }
1248 return;
1249 }
1250
1251 if (line[0] != '+') {
1252 const char *color =
1253 diff_get_color(ecbdata->color_diff,
1254 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1255 ecbdata->lno_in_preimage++;
1256 if (line[0] == ' ')
1257 ecbdata->lno_in_postimage++;
1258 emit_line(ecbdata->opt, color, reset, line, len);
1259 } else {
1260 ecbdata->lno_in_postimage++;
1261 emit_add_line(reset, ecbdata, line + 1, len - 1);
1262 }
1263 }
1264
1265 static char *pprint_rename(const char *a, const char *b)
1266 {
1267 const char *old = a;
1268 const char *new = b;
1269 struct strbuf name = STRBUF_INIT;
1270 int pfx_length, sfx_length;
1271 int pfx_adjust_for_slash;
1272 int len_a = strlen(a);
1273 int len_b = strlen(b);
1274 int a_midlen, b_midlen;
1275 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1276 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1277
1278 if (qlen_a || qlen_b) {
1279 quote_c_style(a, &name, NULL, 0);
1280 strbuf_addstr(&name, " => ");
1281 quote_c_style(b, &name, NULL, 0);
1282 return strbuf_detach(&name, NULL);
1283 }
1284
1285 /* Find common prefix */
1286 pfx_length = 0;
1287 while (*old && *new && *old == *new) {
1288 if (*old == '/')
1289 pfx_length = old - a + 1;
1290 old++;
1291 new++;
1292 }
1293
1294 /* Find common suffix */
1295 old = a + len_a;
1296 new = b + len_b;
1297 sfx_length = 0;
1298 /*
1299 * If there is a common prefix, it must end in a slash. In
1300 * that case we let this loop run 1 into the prefix to see the
1301 * same slash.
1302 *
1303 * If there is no common prefix, we cannot do this as it would
1304 * underrun the input strings.
1305 */
1306 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1307 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1308 b + pfx_length - pfx_adjust_for_slash <= new &&
1309 *old == *new) {
1310 if (*old == '/')
1311 sfx_length = len_a - (old - a);
1312 old--;
1313 new--;
1314 }
1315
1316 /*
1317 * pfx{mid-a => mid-b}sfx
1318 * {pfx-a => pfx-b}sfx
1319 * pfx{sfx-a => sfx-b}
1320 * name-a => name-b
1321 */
1322 a_midlen = len_a - pfx_length - sfx_length;
1323 b_midlen = len_b - pfx_length - sfx_length;
1324 if (a_midlen < 0)
1325 a_midlen = 0;
1326 if (b_midlen < 0)
1327 b_midlen = 0;
1328
1329 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1330 if (pfx_length + sfx_length) {
1331 strbuf_add(&name, a, pfx_length);
1332 strbuf_addch(&name, '{');
1333 }
1334 strbuf_add(&name, a + pfx_length, a_midlen);
1335 strbuf_addstr(&name, " => ");
1336 strbuf_add(&name, b + pfx_length, b_midlen);
1337 if (pfx_length + sfx_length) {
1338 strbuf_addch(&name, '}');
1339 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1340 }
1341 return strbuf_detach(&name, NULL);
1342 }
1343
1344 struct diffstat_t {
1345 int nr;
1346 int alloc;
1347 struct diffstat_file {
1348 char *from_name;
1349 char *name;
1350 char *print_name;
1351 unsigned is_unmerged:1;
1352 unsigned is_binary:1;
1353 unsigned is_renamed:1;
1354 unsigned is_interesting:1;
1355 uintmax_t added, deleted;
1356 } **files;
1357 };
1358
1359 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1360 const char *name_a,
1361 const char *name_b)
1362 {
1363 struct diffstat_file *x;
1364 x = xcalloc(sizeof (*x), 1);
1365 if (diffstat->nr == diffstat->alloc) {
1366 diffstat->alloc = alloc_nr(diffstat->alloc);
1367 diffstat->files = xrealloc(diffstat->files,
1368 diffstat->alloc * sizeof(x));
1369 }
1370 diffstat->files[diffstat->nr++] = x;
1371 if (name_b) {
1372 x->from_name = xstrdup(name_a);
1373 x->name = xstrdup(name_b);
1374 x->is_renamed = 1;
1375 }
1376 else {
1377 x->from_name = NULL;
1378 x->name = xstrdup(name_a);
1379 }
1380 return x;
1381 }
1382
1383 static void diffstat_consume(void *priv, char *line, unsigned long len)
1384 {
1385 struct diffstat_t *diffstat = priv;
1386 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1387
1388 if (line[0] == '+')
1389 x->added++;
1390 else if (line[0] == '-')
1391 x->deleted++;
1392 }
1393
1394 const char mime_boundary_leader[] = "------------";
1395
1396 static int scale_linear(int it, int width, int max_change)
1397 {
1398 if (!it)
1399 return 0;
1400 /*
1401 * make sure that at least one '-' or '+' is printed if
1402 * there is any change to this path. The easiest way is to
1403 * scale linearly as if the alloted width is one column shorter
1404 * than it is, and then add 1 to the result.
1405 */
1406 return 1 + (it * (width - 1) / max_change);
1407 }
1408
1409 static void show_name(FILE *file,
1410 const char *prefix, const char *name, int len)
1411 {
1412 fprintf(file, " %s%-*s |", prefix, len, name);
1413 }
1414
1415 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1416 {
1417 if (cnt <= 0)
1418 return;
1419 fprintf(file, "%s", set);
1420 while (cnt--)
1421 putc(ch, file);
1422 fprintf(file, "%s", reset);
1423 }
1424
1425 static void fill_print_name(struct diffstat_file *file)
1426 {
1427 char *pname;
1428
1429 if (file->print_name)
1430 return;
1431
1432 if (!file->is_renamed) {
1433 struct strbuf buf = STRBUF_INIT;
1434 if (quote_c_style(file->name, &buf, NULL, 0)) {
1435 pname = strbuf_detach(&buf, NULL);
1436 } else {
1437 pname = file->name;
1438 strbuf_release(&buf);
1439 }
1440 } else {
1441 pname = pprint_rename(file->from_name, file->name);
1442 }
1443 file->print_name = pname;
1444 }
1445
1446 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1447 {
1448 struct strbuf sb = STRBUF_INIT;
1449 int ret;
1450
1451 if (!files) {
1452 assert(insertions == 0 && deletions == 0);
1453 return fprintf(fp, "%s\n", " 0 files changed");
1454 }
1455
1456 strbuf_addf(&sb,
1457 (files == 1) ? " %d file changed" : " %d files changed",
1458 files);
1459
1460 /*
1461 * For binary diff, the caller may want to print "x files
1462 * changed" with insertions == 0 && deletions == 0.
1463 *
1464 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1465 * is probably less confusing (i.e skip over "2 files changed
1466 * but nothing about added/removed lines? Is this a bug in Git?").
1467 */
1468 if (insertions || deletions == 0) {
1469 /*
1470 * TRANSLATORS: "+" in (+) is a line addition marker;
1471 * do not translate it.
1472 */
1473 strbuf_addf(&sb,
1474 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1475 insertions);
1476 }
1477
1478 if (deletions || insertions == 0) {
1479 /*
1480 * TRANSLATORS: "-" in (-) is a line removal marker;
1481 * do not translate it.
1482 */
1483 strbuf_addf(&sb,
1484 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1485 deletions);
1486 }
1487 strbuf_addch(&sb, '\n');
1488 ret = fputs(sb.buf, fp);
1489 strbuf_release(&sb);
1490 return ret;
1491 }
1492
1493 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1494 {
1495 int i, len, add, del, adds = 0, dels = 0;
1496 uintmax_t max_change = 0, max_len = 0;
1497 int total_files = data->nr, count;
1498 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1499 const char *reset, *add_c, *del_c;
1500 const char *line_prefix = "";
1501 int extra_shown = 0;
1502
1503 if (data->nr == 0)
1504 return;
1505
1506 line_prefix = diff_line_prefix(options);
1507 count = options->stat_count ? options->stat_count : data->nr;
1508
1509 reset = diff_get_color_opt(options, DIFF_RESET);
1510 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1511 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1512
1513 /*
1514 * Find the longest filename and max number of changes
1515 */
1516 for (i = 0; (i < count) && (i < data->nr); i++) {
1517 struct diffstat_file *file = data->files[i];
1518 uintmax_t change = file->added + file->deleted;
1519
1520 if (!file->is_interesting && (change == 0)) {
1521 count++; /* not shown == room for one more */
1522 continue;
1523 }
1524 fill_print_name(file);
1525 len = strlen(file->print_name);
1526 if (max_len < len)
1527 max_len = len;
1528
1529 if (file->is_unmerged) {
1530 /* "Unmerged" is 8 characters */
1531 bin_width = bin_width < 8 ? 8 : bin_width;
1532 continue;
1533 }
1534 if (file->is_binary) {
1535 /* "Bin XXX -> YYY bytes" */
1536 int w = 14 + decimal_width(file->added)
1537 + decimal_width(file->deleted);
1538 bin_width = bin_width < w ? w : bin_width;
1539 /* Display change counts aligned with "Bin" */
1540 number_width = 3;
1541 continue;
1542 }
1543
1544 if (max_change < change)
1545 max_change = change;
1546 }
1547 count = i; /* where we can stop scanning in data->files[] */
1548
1549 /*
1550 * We have width = stat_width or term_columns() columns total.
1551 * We want a maximum of min(max_len, stat_name_width) for the name part.
1552 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1553 * We also need 1 for " " and 4 + decimal_width(max_change)
1554 * for " | NNNN " and one the empty column at the end, altogether
1555 * 6 + decimal_width(max_change).
1556 *
1557 * If there's not enough space, we will use the smaller of
1558 * stat_name_width (if set) and 5/8*width for the filename,
1559 * and the rest for constant elements + graph part, but no more
1560 * than stat_graph_width for the graph part.
1561 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1562 * for the standard terminal size).
1563 *
1564 * In other words: stat_width limits the maximum width, and
1565 * stat_name_width fixes the maximum width of the filename,
1566 * and is also used to divide available columns if there
1567 * aren't enough.
1568 *
1569 * Binary files are displayed with "Bin XXX -> YYY bytes"
1570 * instead of the change count and graph. This part is treated
1571 * similarly to the graph part, except that it is not
1572 * "scaled". If total width is too small to accommodate the
1573 * guaranteed minimum width of the filename part and the
1574 * separators and this message, this message will "overflow"
1575 * making the line longer than the maximum width.
1576 */
1577
1578 if (options->stat_width == -1)
1579 width = term_columns() - options->output_prefix_length;
1580 else
1581 width = options->stat_width ? options->stat_width : 80;
1582 number_width = decimal_width(max_change) > number_width ?
1583 decimal_width(max_change) : number_width;
1584
1585 if (options->stat_graph_width == -1)
1586 options->stat_graph_width = diff_stat_graph_width;
1587
1588 /*
1589 * Guarantee 3/8*16==6 for the graph part
1590 * and 5/8*16==10 for the filename part
1591 */
1592 if (width < 16 + 6 + number_width)
1593 width = 16 + 6 + number_width;
1594
1595 /*
1596 * First assign sizes that are wanted, ignoring available width.
1597 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1598 * starting from "XXX" should fit in graph_width.
1599 */
1600 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1601 if (options->stat_graph_width &&
1602 options->stat_graph_width < graph_width)
1603 graph_width = options->stat_graph_width;
1604
1605 name_width = (options->stat_name_width > 0 &&
1606 options->stat_name_width < max_len) ?
1607 options->stat_name_width : max_len;
1608
1609 /*
1610 * Adjust adjustable widths not to exceed maximum width
1611 */
1612 if (name_width + number_width + 6 + graph_width > width) {
1613 if (graph_width > width * 3/8 - number_width - 6) {
1614 graph_width = width * 3/8 - number_width - 6;
1615 if (graph_width < 6)
1616 graph_width = 6;
1617 }
1618
1619 if (options->stat_graph_width &&
1620 graph_width > options->stat_graph_width)
1621 graph_width = options->stat_graph_width;
1622 if (name_width > width - number_width - 6 - graph_width)
1623 name_width = width - number_width - 6 - graph_width;
1624 else
1625 graph_width = width - number_width - 6 - name_width;
1626 }
1627
1628 /*
1629 * From here name_width is the width of the name area,
1630 * and graph_width is the width of the graph area.
1631 * max_change is used to scale graph properly.
1632 */
1633 for (i = 0; i < count; i++) {
1634 const char *prefix = "";
1635 struct diffstat_file *file = data->files[i];
1636 char *name = file->print_name;
1637 uintmax_t added = file->added;
1638 uintmax_t deleted = file->deleted;
1639 int name_len;
1640
1641 if (!file->is_interesting && (added + deleted == 0))
1642 continue;
1643
1644 /*
1645 * "scale" the filename
1646 */
1647 len = name_width;
1648 name_len = strlen(name);
1649 if (name_width < name_len) {
1650 char *slash;
1651 prefix = "...";
1652 len -= 3;
1653 name += name_len - len;
1654 slash = strchr(name, '/');
1655 if (slash)
1656 name = slash;
1657 }
1658
1659 if (file->is_binary) {
1660 fprintf(options->file, "%s", line_prefix);
1661 show_name(options->file, prefix, name, len);
1662 fprintf(options->file, " %*s", number_width, "Bin");
1663 if (!added && !deleted) {
1664 putc('\n', options->file);
1665 continue;
1666 }
1667 fprintf(options->file, " %s%"PRIuMAX"%s",
1668 del_c, deleted, reset);
1669 fprintf(options->file, " -> ");
1670 fprintf(options->file, "%s%"PRIuMAX"%s",
1671 add_c, added, reset);
1672 fprintf(options->file, " bytes");
1673 fprintf(options->file, "\n");
1674 continue;
1675 }
1676 else if (file->is_unmerged) {
1677 fprintf(options->file, "%s", line_prefix);
1678 show_name(options->file, prefix, name, len);
1679 fprintf(options->file, " Unmerged\n");
1680 continue;
1681 }
1682
1683 /*
1684 * scale the add/delete
1685 */
1686 add = added;
1687 del = deleted;
1688
1689 if (graph_width <= max_change) {
1690 int total = scale_linear(add + del, graph_width, max_change);
1691 if (total < 2 && add && del)
1692 /* width >= 2 due to the sanity check */
1693 total = 2;
1694 if (add < del) {
1695 add = scale_linear(add, graph_width, max_change);
1696 del = total - add;
1697 } else {
1698 del = scale_linear(del, graph_width, max_change);
1699 add = total - del;
1700 }
1701 }
1702 fprintf(options->file, "%s", line_prefix);
1703 show_name(options->file, prefix, name, len);
1704 fprintf(options->file, " %*"PRIuMAX"%s",
1705 number_width, added + deleted,
1706 added + deleted ? " " : "");
1707 show_graph(options->file, '+', add, add_c, reset);
1708 show_graph(options->file, '-', del, del_c, reset);
1709 fprintf(options->file, "\n");
1710 }
1711
1712 for (i = 0; i < data->nr; i++) {
1713 struct diffstat_file *file = data->files[i];
1714 uintmax_t added = file->added;
1715 uintmax_t deleted = file->deleted;
1716
1717 if (file->is_unmerged ||
1718 (!file->is_interesting && (added + deleted == 0))) {
1719 total_files--;
1720 continue;
1721 }
1722
1723 if (!file->is_binary) {
1724 adds += added;
1725 dels += deleted;
1726 }
1727 if (i < count)
1728 continue;
1729 if (!extra_shown)
1730 fprintf(options->file, "%s ...\n", line_prefix);
1731 extra_shown = 1;
1732 }
1733 fprintf(options->file, "%s", line_prefix);
1734 print_stat_summary(options->file, total_files, adds, dels);
1735 }
1736
1737 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1738 {
1739 int i, adds = 0, dels = 0, total_files = data->nr;
1740
1741 if (data->nr == 0)
1742 return;
1743
1744 for (i = 0; i < data->nr; i++) {
1745 int added = data->files[i]->added;
1746 int deleted= data->files[i]->deleted;
1747
1748 if (data->files[i]->is_unmerged ||
1749 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1750 total_files--;
1751 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1752 adds += added;
1753 dels += deleted;
1754 }
1755 }
1756 fprintf(options->file, "%s", diff_line_prefix(options));
1757 print_stat_summary(options->file, total_files, adds, dels);
1758 }
1759
1760 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1761 {
1762 int i;
1763
1764 if (data->nr == 0)
1765 return;
1766
1767 for (i = 0; i < data->nr; i++) {
1768 struct diffstat_file *file = data->files[i];
1769
1770 fprintf(options->file, "%s", diff_line_prefix(options));
1771
1772 if (file->is_binary)
1773 fprintf(options->file, "-\t-\t");
1774 else
1775 fprintf(options->file,
1776 "%"PRIuMAX"\t%"PRIuMAX"\t",
1777 file->added, file->deleted);
1778 if (options->line_termination) {
1779 fill_print_name(file);
1780 if (!file->is_renamed)
1781 write_name_quoted(file->name, options->file,
1782 options->line_termination);
1783 else {
1784 fputs(file->print_name, options->file);
1785 putc(options->line_termination, options->file);
1786 }
1787 } else {
1788 if (file->is_renamed) {
1789 putc('\0', options->file);
1790 write_name_quoted(file->from_name, options->file, '\0');
1791 }
1792 write_name_quoted(file->name, options->file, '\0');
1793 }
1794 }
1795 }
1796
1797 struct dirstat_file {
1798 const char *name;
1799 unsigned long changed;
1800 };
1801
1802 struct dirstat_dir {
1803 struct dirstat_file *files;
1804 int alloc, nr, permille, cumulative;
1805 };
1806
1807 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1808 unsigned long changed, const char *base, int baselen)
1809 {
1810 unsigned long this_dir = 0;
1811 unsigned int sources = 0;
1812 const char *line_prefix = diff_line_prefix(opt);
1813
1814 while (dir->nr) {
1815 struct dirstat_file *f = dir->files;
1816 int namelen = strlen(f->name);
1817 unsigned long this;
1818 char *slash;
1819
1820 if (namelen < baselen)
1821 break;
1822 if (memcmp(f->name, base, baselen))
1823 break;
1824 slash = strchr(f->name + baselen, '/');
1825 if (slash) {
1826 int newbaselen = slash + 1 - f->name;
1827 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1828 sources++;
1829 } else {
1830 this = f->changed;
1831 dir->files++;
1832 dir->nr--;
1833 sources += 2;
1834 }
1835 this_dir += this;
1836 }
1837
1838 /*
1839 * We don't report dirstat's for
1840 * - the top level
1841 * - or cases where everything came from a single directory
1842 * under this directory (sources == 1).
1843 */
1844 if (baselen && sources != 1) {
1845 if (this_dir) {
1846 int permille = this_dir * 1000 / changed;
1847 if (permille >= dir->permille) {
1848 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1849 permille / 10, permille % 10, baselen, base);
1850 if (!dir->cumulative)
1851 return 0;
1852 }
1853 }
1854 }
1855 return this_dir;
1856 }
1857
1858 static int dirstat_compare(const void *_a, const void *_b)
1859 {
1860 const struct dirstat_file *a = _a;
1861 const struct dirstat_file *b = _b;
1862 return strcmp(a->name, b->name);
1863 }
1864
1865 static void show_dirstat(struct diff_options *options)
1866 {
1867 int i;
1868 unsigned long changed;
1869 struct dirstat_dir dir;
1870 struct diff_queue_struct *q = &diff_queued_diff;
1871
1872 dir.files = NULL;
1873 dir.alloc = 0;
1874 dir.nr = 0;
1875 dir.permille = options->dirstat_permille;
1876 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1877
1878 changed = 0;
1879 for (i = 0; i < q->nr; i++) {
1880 struct diff_filepair *p = q->queue[i];
1881 const char *name;
1882 unsigned long copied, added, damage;
1883 int content_changed;
1884
1885 name = p->two->path ? p->two->path : p->one->path;
1886
1887 if (p->one->sha1_valid && p->two->sha1_valid)
1888 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1889 else
1890 content_changed = 1;
1891
1892 if (!content_changed) {
1893 /*
1894 * The SHA1 has not changed, so pre-/post-content is
1895 * identical. We can therefore skip looking at the
1896 * file contents altogether.
1897 */
1898 damage = 0;
1899 goto found_damage;
1900 }
1901
1902 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1903 /*
1904 * In --dirstat-by-file mode, we don't really need to
1905 * look at the actual file contents at all.
1906 * The fact that the SHA1 changed is enough for us to
1907 * add this file to the list of results
1908 * (with each file contributing equal damage).
1909 */
1910 damage = 1;
1911 goto found_damage;
1912 }
1913
1914 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1915 diff_populate_filespec(p->one, 0);
1916 diff_populate_filespec(p->two, 0);
1917 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1918 &copied, &added);
1919 diff_free_filespec_data(p->one);
1920 diff_free_filespec_data(p->two);
1921 } else if (DIFF_FILE_VALID(p->one)) {
1922 diff_populate_filespec(p->one, 1);
1923 copied = added = 0;
1924 diff_free_filespec_data(p->one);
1925 } else if (DIFF_FILE_VALID(p->two)) {
1926 diff_populate_filespec(p->two, 1);
1927 copied = 0;
1928 added = p->two->size;
1929 diff_free_filespec_data(p->two);
1930 } else
1931 continue;
1932
1933 /*
1934 * Original minus copied is the removed material,
1935 * added is the new material. They are both damages
1936 * made to the preimage.
1937 * If the resulting damage is zero, we know that
1938 * diffcore_count_changes() considers the two entries to
1939 * be identical, but since content_changed is true, we
1940 * know that there must have been _some_ kind of change,
1941 * so we force all entries to have damage > 0.
1942 */
1943 damage = (p->one->size - copied) + added;
1944 if (!damage)
1945 damage = 1;
1946
1947 found_damage:
1948 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1949 dir.files[dir.nr].name = name;
1950 dir.files[dir.nr].changed = damage;
1951 changed += damage;
1952 dir.nr++;
1953 }
1954
1955 /* This can happen even with many files, if everything was renames */
1956 if (!changed)
1957 return;
1958
1959 /* Show all directories with more than x% of the changes */
1960 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1961 gather_dirstat(options, &dir, changed, "", 0);
1962 }
1963
1964 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1965 {
1966 int i;
1967 unsigned long changed;
1968 struct dirstat_dir dir;
1969
1970 if (data->nr == 0)
1971 return;
1972
1973 dir.files = NULL;
1974 dir.alloc = 0;
1975 dir.nr = 0;
1976 dir.permille = options->dirstat_permille;
1977 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1978
1979 changed = 0;
1980 for (i = 0; i < data->nr; i++) {
1981 struct diffstat_file *file = data->files[i];
1982 unsigned long damage = file->added + file->deleted;
1983 if (file->is_binary)
1984 /*
1985 * binary files counts bytes, not lines. Must find some
1986 * way to normalize binary bytes vs. textual lines.
1987 * The following heuristic assumes that there are 64
1988 * bytes per "line".
1989 * This is stupid and ugly, but very cheap...
1990 */
1991 damage = (damage + 63) / 64;
1992 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1993 dir.files[dir.nr].name = file->name;
1994 dir.files[dir.nr].changed = damage;
1995 changed += damage;
1996 dir.nr++;
1997 }
1998
1999 /* This can happen even with many files, if everything was renames */
2000 if (!changed)
2001 return;
2002
2003 /* Show all directories with more than x% of the changes */
2004 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2005 gather_dirstat(options, &dir, changed, "", 0);
2006 }
2007
2008 static void free_diffstat_info(struct diffstat_t *diffstat)
2009 {
2010 int i;
2011 for (i = 0; i < diffstat->nr; i++) {
2012 struct diffstat_file *f = diffstat->files[i];
2013 if (f->name != f->print_name)
2014 free(f->print_name);
2015 free(f->name);
2016 free(f->from_name);
2017 free(f);
2018 }
2019 free(diffstat->files);
2020 }
2021
2022 struct checkdiff_t {
2023 const char *filename;
2024 int lineno;
2025 int conflict_marker_size;
2026 struct diff_options *o;
2027 unsigned ws_rule;
2028 unsigned status;
2029 };
2030
2031 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2032 {
2033 char firstchar;
2034 int cnt;
2035
2036 if (len < marker_size + 1)
2037 return 0;
2038 firstchar = line[0];
2039 switch (firstchar) {
2040 case '=': case '>': case '<': case '|':
2041 break;
2042 default:
2043 return 0;
2044 }
2045 for (cnt = 1; cnt < marker_size; cnt++)
2046 if (line[cnt] != firstchar)
2047 return 0;
2048 /* line[1] thru line[marker_size-1] are same as firstchar */
2049 if (len < marker_size + 1 || !isspace(line[marker_size]))
2050 return 0;
2051 return 1;
2052 }
2053
2054 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2055 {
2056 struct checkdiff_t *data = priv;
2057 int marker_size = data->conflict_marker_size;
2058 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2059 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2060 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2061 char *err;
2062 const char *line_prefix;
2063
2064 assert(data->o);
2065 line_prefix = diff_line_prefix(data->o);
2066
2067 if (line[0] == '+') {
2068 unsigned bad;
2069 data->lineno++;
2070 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2071 data->status |= 1;
2072 fprintf(data->o->file,
2073 "%s%s:%d: leftover conflict marker\n",
2074 line_prefix, data->filename, data->lineno);
2075 }
2076 bad = ws_check(line + 1, len - 1, data->ws_rule);
2077 if (!bad)
2078 return;
2079 data->status |= bad;
2080 err = whitespace_error_string(bad);
2081 fprintf(data->o->file, "%s%s:%d: %s.\n",
2082 line_prefix, data->filename, data->lineno, err);
2083 free(err);
2084 emit_line(data->o, set, reset, line, 1);
2085 ws_check_emit(line + 1, len - 1, data->ws_rule,
2086 data->o->file, set, reset, ws);
2087 } else if (line[0] == ' ') {
2088 data->lineno++;
2089 } else if (line[0] == '@') {
2090 char *plus = strchr(line, '+');
2091 if (plus)
2092 data->lineno = strtol(plus, NULL, 10) - 1;
2093 else
2094 die("invalid diff");
2095 }
2096 }
2097
2098 static unsigned char *deflate_it(char *data,
2099 unsigned long size,
2100 unsigned long *result_size)
2101 {
2102 int bound;
2103 unsigned char *deflated;
2104 git_zstream stream;
2105
2106 memset(&stream, 0, sizeof(stream));
2107 git_deflate_init(&stream, zlib_compression_level);
2108 bound = git_deflate_bound(&stream, size);
2109 deflated = xmalloc(bound);
2110 stream.next_out = deflated;
2111 stream.avail_out = bound;
2112
2113 stream.next_in = (unsigned char *)data;
2114 stream.avail_in = size;
2115 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2116 ; /* nothing */
2117 git_deflate_end(&stream);
2118 *result_size = stream.total_out;
2119 return deflated;
2120 }
2121
2122 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2123 const char *prefix)
2124 {
2125 void *cp;
2126 void *delta;
2127 void *deflated;
2128 void *data;
2129 unsigned long orig_size;
2130 unsigned long delta_size;
2131 unsigned long deflate_size;
2132 unsigned long data_size;
2133
2134 /* We could do deflated delta, or we could do just deflated two,
2135 * whichever is smaller.
2136 */
2137 delta = NULL;
2138 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2139 if (one->size && two->size) {
2140 delta = diff_delta(one->ptr, one->size,
2141 two->ptr, two->size,
2142 &delta_size, deflate_size);
2143 if (delta) {
2144 void *to_free = delta;
2145 orig_size = delta_size;
2146 delta = deflate_it(delta, delta_size, &delta_size);
2147 free(to_free);
2148 }
2149 }
2150
2151 if (delta && delta_size < deflate_size) {
2152 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2153 free(deflated);
2154 data = delta;
2155 data_size = delta_size;
2156 }
2157 else {
2158 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2159 free(delta);
2160 data = deflated;
2161 data_size = deflate_size;
2162 }
2163
2164 /* emit data encoded in base85 */
2165 cp = data;
2166 while (data_size) {
2167 int bytes = (52 < data_size) ? 52 : data_size;
2168 char line[70];
2169 data_size -= bytes;
2170 if (bytes <= 26)
2171 line[0] = bytes + 'A' - 1;
2172 else
2173 line[0] = bytes - 26 + 'a' - 1;
2174 encode_85(line + 1, cp, bytes);
2175 cp = (char *) cp + bytes;
2176 fprintf(file, "%s", prefix);
2177 fputs(line, file);
2178 fputc('\n', file);
2179 }
2180 fprintf(file, "%s\n", prefix);
2181 free(data);
2182 }
2183
2184 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2185 const char *prefix)
2186 {
2187 fprintf(file, "%sGIT binary patch\n", prefix);
2188 emit_binary_diff_body(file, one, two, prefix);
2189 emit_binary_diff_body(file, two, one, prefix);
2190 }
2191
2192 int diff_filespec_is_binary(struct diff_filespec *one)
2193 {
2194 if (one->is_binary == -1) {
2195 diff_filespec_load_driver(one);
2196 if (one->driver->binary != -1)
2197 one->is_binary = one->driver->binary;
2198 else {
2199 if (!one->data && DIFF_FILE_VALID(one))
2200 diff_populate_filespec(one, 0);
2201 if (one->data)
2202 one->is_binary = buffer_is_binary(one->data,
2203 one->size);
2204 if (one->is_binary == -1)
2205 one->is_binary = 0;
2206 }
2207 }
2208 return one->is_binary;
2209 }
2210
2211 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2212 {
2213 diff_filespec_load_driver(one);
2214 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2215 }
2216
2217 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2218 {
2219 if (!options->a_prefix)
2220 options->a_prefix = a;
2221 if (!options->b_prefix)
2222 options->b_prefix = b;
2223 }
2224
2225 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2226 {
2227 if (!DIFF_FILE_VALID(one))
2228 return NULL;
2229
2230 diff_filespec_load_driver(one);
2231 return userdiff_get_textconv(one->driver);
2232 }
2233
2234 static void builtin_diff(const char *name_a,
2235 const char *name_b,
2236 struct diff_filespec *one,
2237 struct diff_filespec *two,
2238 const char *xfrm_msg,
2239 int must_show_header,
2240 struct diff_options *o,
2241 int complete_rewrite)
2242 {
2243 mmfile_t mf1, mf2;
2244 const char *lbl[2];
2245 char *a_one, *b_two;
2246 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2247 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2248 const char *a_prefix, *b_prefix;
2249 struct userdiff_driver *textconv_one = NULL;
2250 struct userdiff_driver *textconv_two = NULL;
2251 struct strbuf header = STRBUF_INIT;
2252 const char *line_prefix = diff_line_prefix(o);
2253
2254 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2255 (!one->mode || S_ISGITLINK(one->mode)) &&
2256 (!two->mode || S_ISGITLINK(two->mode))) {
2257 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2258 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2259 show_submodule_summary(o->file, one->path ? one->path : two->path,
2260 line_prefix,
2261 one->sha1, two->sha1, two->dirty_submodule,
2262 meta, del, add, reset);
2263 return;
2264 }
2265
2266 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2267 textconv_one = get_textconv(one);
2268 textconv_two = get_textconv(two);
2269 }
2270
2271 diff_set_mnemonic_prefix(o, "a/", "b/");
2272 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2273 a_prefix = o->b_prefix;
2274 b_prefix = o->a_prefix;
2275 } else {
2276 a_prefix = o->a_prefix;
2277 b_prefix = o->b_prefix;
2278 }
2279
2280 /* Never use a non-valid filename anywhere if at all possible */
2281 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2282 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2283
2284 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2285 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2286 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2287 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2288 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2289 if (lbl[0][0] == '/') {
2290 /* /dev/null */
2291 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2292 if (xfrm_msg)
2293 strbuf_addstr(&header, xfrm_msg);
2294 must_show_header = 1;
2295 }
2296 else if (lbl[1][0] == '/') {
2297 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2298 if (xfrm_msg)
2299 strbuf_addstr(&header, xfrm_msg);
2300 must_show_header = 1;
2301 }
2302 else {
2303 if (one->mode != two->mode) {
2304 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2305 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2306 must_show_header = 1;
2307 }
2308 if (xfrm_msg)
2309 strbuf_addstr(&header, xfrm_msg);
2310
2311 /*
2312 * we do not run diff between different kind
2313 * of objects.
2314 */
2315 if ((one->mode ^ two->mode) & S_IFMT)
2316 goto free_ab_and_return;
2317 if (complete_rewrite &&
2318 (textconv_one || !diff_filespec_is_binary(one)) &&
2319 (textconv_two || !diff_filespec_is_binary(two))) {
2320 fprintf(o->file, "%s", header.buf);
2321 strbuf_reset(&header);
2322 emit_rewrite_diff(name_a, name_b, one, two,
2323 textconv_one, textconv_two, o);
2324 o->found_changes = 1;
2325 goto free_ab_and_return;
2326 }
2327 }
2328
2329 if (o->irreversible_delete && lbl[1][0] == '/') {
2330 fprintf(o->file, "%s", header.buf);
2331 strbuf_reset(&header);
2332 goto free_ab_and_return;
2333 } else if (!DIFF_OPT_TST(o, TEXT) &&
2334 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2335 (!textconv_two && diff_filespec_is_binary(two)) )) {
2336 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2337 die("unable to read files to diff");
2338 /* Quite common confusing case */
2339 if (mf1.size == mf2.size &&
2340 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2341 if (must_show_header)
2342 fprintf(o->file, "%s", header.buf);
2343 goto free_ab_and_return;
2344 }
2345 fprintf(o->file, "%s", header.buf);
2346 strbuf_reset(&header);
2347 if (DIFF_OPT_TST(o, BINARY))
2348 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2349 else
2350 fprintf(o->file, "%sBinary files %s and %s differ\n",
2351 line_prefix, lbl[0], lbl[1]);
2352 o->found_changes = 1;
2353 } else {
2354 /* Crazy xdl interfaces.. */
2355 const char *diffopts = getenv("GIT_DIFF_OPTS");
2356 xpparam_t xpp;
2357 xdemitconf_t xecfg;
2358 struct emit_callback ecbdata;
2359 const struct userdiff_funcname *pe;
2360
2361 if (must_show_header) {
2362 fprintf(o->file, "%s", header.buf);
2363 strbuf_reset(&header);
2364 }
2365
2366 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2367 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2368
2369 pe = diff_funcname_pattern(one);
2370 if (!pe)
2371 pe = diff_funcname_pattern(two);
2372
2373 memset(&xpp, 0, sizeof(xpp));
2374 memset(&xecfg, 0, sizeof(xecfg));
2375 memset(&ecbdata, 0, sizeof(ecbdata));
2376 ecbdata.label_path = lbl;
2377 ecbdata.color_diff = want_color(o->use_color);
2378 ecbdata.found_changesp = &o->found_changes;
2379 ecbdata.ws_rule = whitespace_rule(name_b);
2380 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2381 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2382 ecbdata.opt = o;
2383 ecbdata.header = header.len ? &header : NULL;
2384 xpp.flags = o->xdl_opts;
2385 xecfg.ctxlen = o->context;
2386 xecfg.interhunkctxlen = o->interhunkcontext;
2387 xecfg.flags = XDL_EMIT_FUNCNAMES;
2388 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2389 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2390 if (pe)
2391 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2392 if (!diffopts)
2393 ;
2394 else if (starts_with(diffopts, "--unified="))
2395 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2396 else if (starts_with(diffopts, "-u"))
2397 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2398 if (o->word_diff)
2399 init_diff_words_data(&ecbdata, o, one, two);
2400 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2401 &xpp, &xecfg);
2402 if (o->word_diff)
2403 free_diff_words_data(&ecbdata);
2404 if (textconv_one)
2405 free(mf1.ptr);
2406 if (textconv_two)
2407 free(mf2.ptr);
2408 xdiff_clear_find_func(&xecfg);
2409 }
2410
2411 free_ab_and_return:
2412 strbuf_release(&header);
2413 diff_free_filespec_data(one);
2414 diff_free_filespec_data(two);
2415 free(a_one);
2416 free(b_two);
2417 return;
2418 }
2419
2420 static void builtin_diffstat(const char *name_a, const char *name_b,
2421 struct diff_filespec *one,
2422 struct diff_filespec *two,
2423 struct diffstat_t *diffstat,
2424 struct diff_options *o,
2425 struct diff_filepair *p)
2426 {
2427 mmfile_t mf1, mf2;
2428 struct diffstat_file *data;
2429 int same_contents;
2430 int complete_rewrite = 0;
2431
2432 if (!DIFF_PAIR_UNMERGED(p)) {
2433 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2434 complete_rewrite = 1;
2435 }
2436
2437 data = diffstat_add(diffstat, name_a, name_b);
2438 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2439
2440 if (!one || !two) {
2441 data->is_unmerged = 1;
2442 return;
2443 }
2444
2445 same_contents = !hashcmp(one->sha1, two->sha1);
2446
2447 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2448 data->is_binary = 1;
2449 if (same_contents) {
2450 data->added = 0;
2451 data->deleted = 0;
2452 } else {
2453 data->added = diff_filespec_size(two);
2454 data->deleted = diff_filespec_size(one);
2455 }
2456 }
2457
2458 else if (complete_rewrite) {
2459 diff_populate_filespec(one, 0);
2460 diff_populate_filespec(two, 0);
2461 data->deleted = count_lines(one->data, one->size);
2462 data->added = count_lines(two->data, two->size);
2463 }
2464
2465 else if (!same_contents) {
2466 /* Crazy xdl interfaces.. */
2467 xpparam_t xpp;
2468 xdemitconf_t xecfg;
2469
2470 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2471 die("unable to read files to diff");
2472
2473 memset(&xpp, 0, sizeof(xpp));
2474 memset(&xecfg, 0, sizeof(xecfg));
2475 xpp.flags = o->xdl_opts;
2476 xecfg.ctxlen = o->context;
2477 xecfg.interhunkctxlen = o->interhunkcontext;
2478 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2479 &xpp, &xecfg);
2480 }
2481
2482 diff_free_filespec_data(one);
2483 diff_free_filespec_data(two);
2484 }
2485
2486 static void builtin_checkdiff(const char *name_a, const char *name_b,
2487 const char *attr_path,
2488 struct diff_filespec *one,
2489 struct diff_filespec *two,
2490 struct diff_options *o)
2491 {
2492 mmfile_t mf1, mf2;
2493 struct checkdiff_t data;
2494
2495 if (!two)
2496 return;
2497
2498 memset(&data, 0, sizeof(data));
2499 data.filename = name_b ? name_b : name_a;
2500 data.lineno = 0;
2501 data.o = o;
2502 data.ws_rule = whitespace_rule(attr_path);
2503 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2504
2505 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2506 die("unable to read files to diff");
2507
2508 /*
2509 * All the other codepaths check both sides, but not checking
2510 * the "old" side here is deliberate. We are checking the newly
2511 * introduced changes, and as long as the "new" side is text, we
2512 * can and should check what it introduces.
2513 */
2514 if (diff_filespec_is_binary(two))
2515 goto free_and_return;
2516 else {
2517 /* Crazy xdl interfaces.. */
2518 xpparam_t xpp;
2519 xdemitconf_t xecfg;
2520
2521 memset(&xpp, 0, sizeof(xpp));
2522 memset(&xecfg, 0, sizeof(xecfg));
2523 xecfg.ctxlen = 1; /* at least one context line */
2524 xpp.flags = 0;
2525 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2526 &xpp, &xecfg);
2527
2528 if (data.ws_rule & WS_BLANK_AT_EOF) {
2529 struct emit_callback ecbdata;
2530 int blank_at_eof;
2531
2532 ecbdata.ws_rule = data.ws_rule;
2533 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2534 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2535
2536 if (blank_at_eof) {
2537 static char *err;
2538 if (!err)
2539 err = whitespace_error_string(WS_BLANK_AT_EOF);
2540 fprintf(o->file, "%s:%d: %s.\n",
2541 data.filename, blank_at_eof, err);
2542 data.status = 1; /* report errors */
2543 }
2544 }
2545 }
2546 free_and_return:
2547 diff_free_filespec_data(one);
2548 diff_free_filespec_data(two);
2549 if (data.status)
2550 DIFF_OPT_SET(o, CHECK_FAILED);
2551 }
2552
2553 struct diff_filespec *alloc_filespec(const char *path)
2554 {
2555 int namelen = strlen(path);
2556 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2557
2558 memset(spec, 0, sizeof(*spec));
2559 spec->path = (char *)(spec + 1);
2560 memcpy(spec->path, path, namelen+1);
2561 spec->count = 1;
2562 spec->is_binary = -1;
2563 return spec;
2564 }
2565
2566 void free_filespec(struct diff_filespec *spec)
2567 {
2568 if (!--spec->count) {
2569 diff_free_filespec_data(spec);
2570 free(spec);
2571 }
2572 }
2573
2574 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2575 int sha1_valid, unsigned short mode)
2576 {
2577 if (mode) {
2578 spec->mode = canon_mode(mode);
2579 hashcpy(spec->sha1, sha1);
2580 spec->sha1_valid = sha1_valid;
2581 }
2582 }
2583
2584 /*
2585 * Given a name and sha1 pair, if the index tells us the file in
2586 * the work tree has that object contents, return true, so that
2587 * prepare_temp_file() does not have to inflate and extract.
2588 */
2589 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2590 {
2591 const struct cache_entry *ce;
2592 struct stat st;
2593 int pos, len;
2594
2595 /*
2596 * We do not read the cache ourselves here, because the
2597 * benchmark with my previous version that always reads cache
2598 * shows that it makes things worse for diff-tree comparing
2599 * two linux-2.6 kernel trees in an already checked out work
2600 * tree. This is because most diff-tree comparisons deal with
2601 * only a small number of files, while reading the cache is
2602 * expensive for a large project, and its cost outweighs the
2603 * savings we get by not inflating the object to a temporary
2604 * file. Practically, this code only helps when we are used
2605 * by diff-cache --cached, which does read the cache before
2606 * calling us.
2607 */
2608 if (!active_cache)
2609 return 0;
2610
2611 /* We want to avoid the working directory if our caller
2612 * doesn't need the data in a normal file, this system
2613 * is rather slow with its stat/open/mmap/close syscalls,
2614 * and the object is contained in a pack file. The pack
2615 * is probably already open and will be faster to obtain
2616 * the data through than the working directory. Loose
2617 * objects however would tend to be slower as they need
2618 * to be individually opened and inflated.
2619 */
2620 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2621 return 0;
2622
2623 len = strlen(name);
2624 pos = cache_name_pos(name, len);
2625 if (pos < 0)
2626 return 0;
2627 ce = active_cache[pos];
2628
2629 /*
2630 * This is not the sha1 we are looking for, or
2631 * unreusable because it is not a regular file.
2632 */
2633 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2634 return 0;
2635
2636 /*
2637 * If ce is marked as "assume unchanged", there is no
2638 * guarantee that work tree matches what we are looking for.
2639 */
2640 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2641 return 0;
2642
2643 /*
2644 * If ce matches the file in the work tree, we can reuse it.
2645 */
2646 if (ce_uptodate(ce) ||
2647 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2648 return 1;
2649
2650 return 0;
2651 }
2652
2653 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2654 {
2655 int len;
2656 char *data = xmalloc(100), *dirty = "";
2657
2658 /* Are we looking at the work tree? */
2659 if (s->dirty_submodule)
2660 dirty = "-dirty";
2661
2662 len = snprintf(data, 100,
2663 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2664 s->data = data;
2665 s->size = len;
2666 s->should_free = 1;
2667 if (size_only) {
2668 s->data = NULL;
2669 free(data);
2670 }
2671 return 0;
2672 }
2673
2674 /*
2675 * While doing rename detection and pickaxe operation, we may need to
2676 * grab the data for the blob (or file) for our own in-core comparison.
2677 * diff_filespec has data and size fields for this purpose.
2678 */
2679 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2680 {
2681 int err = 0;
2682 /*
2683 * demote FAIL to WARN to allow inspecting the situation
2684 * instead of refusing.
2685 */
2686 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2687 ? SAFE_CRLF_WARN
2688 : safe_crlf);
2689
2690 if (!DIFF_FILE_VALID(s))
2691 die("internal error: asking to populate invalid file.");
2692 if (S_ISDIR(s->mode))
2693 return -1;
2694
2695 if (s->data)
2696 return 0;
2697
2698 if (size_only && 0 < s->size)
2699 return 0;
2700
2701 if (S_ISGITLINK(s->mode))
2702 return diff_populate_gitlink(s, size_only);
2703
2704 if (!s->sha1_valid ||
2705 reuse_worktree_file(s->path, s->sha1, 0)) {
2706 struct strbuf buf = STRBUF_INIT;
2707 struct stat st;
2708 int fd;
2709
2710 if (lstat(s->path, &st) < 0) {
2711 if (errno == ENOENT) {
2712 err_empty:
2713 err = -1;
2714 empty:
2715 s->data = (char *)"";
2716 s->size = 0;
2717 return err;
2718 }
2719 }
2720 s->size = xsize_t(st.st_size);
2721 if (!s->size)
2722 goto empty;
2723 if (S_ISLNK(st.st_mode)) {
2724 struct strbuf sb = STRBUF_INIT;
2725
2726 if (strbuf_readlink(&sb, s->path, s->size))
2727 goto err_empty;
2728 s->size = sb.len;
2729 s->data = strbuf_detach(&sb, NULL);
2730 s->should_free = 1;
2731 return 0;
2732 }
2733 if (size_only)
2734 return 0;
2735 fd = open(s->path, O_RDONLY);
2736 if (fd < 0)
2737 goto err_empty;
2738 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2739 close(fd);
2740 s->should_munmap = 1;
2741
2742 /*
2743 * Convert from working tree format to canonical git format
2744 */
2745 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2746 size_t size = 0;
2747 munmap(s->data, s->size);
2748 s->should_munmap = 0;
2749 s->data = strbuf_detach(&buf, &size);
2750 s->size = size;
2751 s->should_free = 1;
2752 }
2753 }
2754 else {
2755 enum object_type type;
2756 if (size_only) {
2757 type = sha1_object_info(s->sha1, &s->size);
2758 if (type < 0)
2759 die("unable to read %s", sha1_to_hex(s->sha1));
2760 } else {
2761 s->data = read_sha1_file(s->sha1, &type, &s->size);
2762 if (!s->data)
2763 die("unable to read %s", sha1_to_hex(s->sha1));
2764 s->should_free = 1;
2765 }
2766 }
2767 return 0;
2768 }
2769
2770 void diff_free_filespec_blob(struct diff_filespec *s)
2771 {
2772 if (s->should_free)
2773 free(s->data);
2774 else if (s->should_munmap)
2775 munmap(s->data, s->size);
2776
2777 if (s->should_free || s->should_munmap) {
2778 s->should_free = s->should_munmap = 0;
2779 s->data = NULL;
2780 }
2781 }
2782
2783 void diff_free_filespec_data(struct diff_filespec *s)
2784 {
2785 diff_free_filespec_blob(s);
2786 free(s->cnt_data);
2787 s->cnt_data = NULL;
2788 }
2789
2790 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2791 void *blob,
2792 unsigned long size,
2793 const unsigned char *sha1,
2794 int mode)
2795 {
2796 int fd;
2797 struct strbuf buf = STRBUF_INIT;
2798 struct strbuf template = STRBUF_INIT;
2799 char *path_dup = xstrdup(path);
2800 const char *base = basename(path_dup);
2801
2802 /* Generate "XXXXXX_basename.ext" */
2803 strbuf_addstr(&template, "XXXXXX_");
2804 strbuf_addstr(&template, base);
2805
2806 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2807 strlen(base) + 1);
2808 if (fd < 0)
2809 die_errno("unable to create temp-file");
2810 if (convert_to_working_tree(path,
2811 (const char *)blob, (size_t)size, &buf)) {
2812 blob = buf.buf;
2813 size = buf.len;
2814 }
2815 if (write_in_full(fd, blob, size) != size)
2816 die_errno("unable to write temp-file");
2817 close(fd);
2818 temp->name = temp->tmp_path;
2819 strcpy(temp->hex, sha1_to_hex(sha1));
2820 temp->hex[40] = 0;
2821 sprintf(temp->mode, "%06o", mode);
2822 strbuf_release(&buf);
2823 strbuf_release(&template);
2824 free(path_dup);
2825 }
2826
2827 static struct diff_tempfile *prepare_temp_file(const char *name,
2828 struct diff_filespec *one)
2829 {
2830 struct diff_tempfile *temp = claim_diff_tempfile();
2831
2832 if (!DIFF_FILE_VALID(one)) {
2833 not_a_valid_file:
2834 /* A '-' entry produces this for file-2, and
2835 * a '+' entry produces this for file-1.
2836 */
2837 temp->name = "/dev/null";
2838 strcpy(temp->hex, ".");
2839 strcpy(temp->mode, ".");
2840 return temp;
2841 }
2842
2843 if (!remove_tempfile_installed) {
2844 atexit(remove_tempfile);
2845 sigchain_push_common(remove_tempfile_on_signal);
2846 remove_tempfile_installed = 1;
2847 }
2848
2849 if (!S_ISGITLINK(one->mode) &&
2850 (!one->sha1_valid ||
2851 reuse_worktree_file(name, one->sha1, 1))) {
2852 struct stat st;
2853 if (lstat(name, &st) < 0) {
2854 if (errno == ENOENT)
2855 goto not_a_valid_file;
2856 die_errno("stat(%s)", name);
2857 }
2858 if (S_ISLNK(st.st_mode)) {
2859 struct strbuf sb = STRBUF_INIT;
2860 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2861 die_errno("readlink(%s)", name);
2862 prep_temp_blob(name, temp, sb.buf, sb.len,
2863 (one->sha1_valid ?
2864 one->sha1 : null_sha1),
2865 (one->sha1_valid ?
2866 one->mode : S_IFLNK));
2867 strbuf_release(&sb);
2868 }
2869 else {
2870 /* we can borrow from the file in the work tree */
2871 temp->name = name;
2872 if (!one->sha1_valid)
2873 strcpy(temp->hex, sha1_to_hex(null_sha1));
2874 else
2875 strcpy(temp->hex, sha1_to_hex(one->sha1));
2876 /* Even though we may sometimes borrow the
2877 * contents from the work tree, we always want
2878 * one->mode. mode is trustworthy even when
2879 * !(one->sha1_valid), as long as
2880 * DIFF_FILE_VALID(one).
2881 */
2882 sprintf(temp->mode, "%06o", one->mode);
2883 }
2884 return temp;
2885 }
2886 else {
2887 if (diff_populate_filespec(one, 0))
2888 die("cannot read data blob for %s", one->path);
2889 prep_temp_blob(name, temp, one->data, one->size,
2890 one->sha1, one->mode);
2891 }
2892 return temp;
2893 }
2894
2895 /* An external diff command takes:
2896 *
2897 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2898 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2899 *
2900 */
2901 static void run_external_diff(const char *pgm,
2902 const char *name,
2903 const char *other,
2904 struct diff_filespec *one,
2905 struct diff_filespec *two,
2906 const char *xfrm_msg,
2907 int complete_rewrite,
2908 struct diff_options *o)
2909 {
2910 struct argv_array argv = ARGV_ARRAY_INIT;
2911 struct argv_array env = ARGV_ARRAY_INIT;
2912 struct diff_queue_struct *q = &diff_queued_diff;
2913
2914 if (one && two) {
2915 struct diff_tempfile *temp_one, *temp_two;
2916 const char *othername = (other ? other : name);
2917 temp_one = prepare_temp_file(name, one);
2918 temp_two = prepare_temp_file(othername, two);
2919 argv_array_push(&argv, pgm);
2920 argv_array_push(&argv, name);
2921 argv_array_push(&argv, temp_one->name);
2922 argv_array_push(&argv, temp_one->hex);
2923 argv_array_push(&argv, temp_one->mode);
2924 argv_array_push(&argv, temp_two->name);
2925 argv_array_push(&argv, temp_two->hex);
2926 argv_array_push(&argv, temp_two->mode);
2927 if (other) {
2928 argv_array_push(&argv, other);
2929 argv_array_push(&argv, xfrm_msg);
2930 }
2931 } else {
2932 argv_array_push(&argv, pgm);
2933 argv_array_push(&argv, name);
2934 }
2935 fflush(NULL);
2936
2937 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
2938 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
2939
2940 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
2941 die(_("external diff died, stopping at %s"), name);
2942
2943 remove_tempfile();
2944 argv_array_clear(&argv);
2945 argv_array_clear(&env);
2946 }
2947
2948 static int similarity_index(struct diff_filepair *p)
2949 {
2950 return p->score * 100 / MAX_SCORE;
2951 }
2952
2953 static void fill_metainfo(struct strbuf *msg,
2954 const char *name,
2955 const char *other,
2956 struct diff_filespec *one,
2957 struct diff_filespec *two,
2958 struct diff_options *o,
2959 struct diff_filepair *p,
2960 int *must_show_header,
2961 int use_color)
2962 {
2963 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2964 const char *reset = diff_get_color(use_color, DIFF_RESET);
2965 const char *line_prefix = diff_line_prefix(o);
2966
2967 *must_show_header = 1;
2968 strbuf_init(msg, PATH_MAX * 2 + 300);
2969 switch (p->status) {
2970 case DIFF_STATUS_COPIED:
2971 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2972 line_prefix, set, similarity_index(p));
2973 strbuf_addf(msg, "%s\n%s%scopy from ",
2974 reset, line_prefix, set);
2975 quote_c_style(name, msg, NULL, 0);
2976 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2977 quote_c_style(other, msg, NULL, 0);
2978 strbuf_addf(msg, "%s\n", reset);
2979 break;
2980 case DIFF_STATUS_RENAMED:
2981 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2982 line_prefix, set, similarity_index(p));
2983 strbuf_addf(msg, "%s\n%s%srename from ",
2984 reset, line_prefix, set);
2985 quote_c_style(name, msg, NULL, 0);
2986 strbuf_addf(msg, "%s\n%s%srename to ",
2987 reset, line_prefix, set);
2988 quote_c_style(other, msg, NULL, 0);
2989 strbuf_addf(msg, "%s\n", reset);
2990 break;
2991 case DIFF_STATUS_MODIFIED:
2992 if (p->score) {
2993 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2994 line_prefix,
2995 set, similarity_index(p), reset);
2996 break;
2997 }
2998 /* fallthru */
2999 default:
3000 *must_show_header = 0;
3001 }
3002 if (one && two && hashcmp(one->sha1, two->sha1)) {
3003 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3004
3005 if (DIFF_OPT_TST(o, BINARY)) {
3006 mmfile_t mf;
3007 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3008 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3009 abbrev = 40;
3010 }
3011 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3012 find_unique_abbrev(one->sha1, abbrev));
3013 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3014 if (one->mode == two->mode)
3015 strbuf_addf(msg, " %06o", one->mode);
3016 strbuf_addf(msg, "%s\n", reset);
3017 }
3018 }
3019
3020 static void run_diff_cmd(const char *pgm,
3021 const char *name,
3022 const char *other,
3023 const char *attr_path,
3024 struct diff_filespec *one,
3025 struct diff_filespec *two,
3026 struct strbuf *msg,
3027 struct diff_options *o,
3028 struct diff_filepair *p)
3029 {
3030 const char *xfrm_msg = NULL;
3031 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3032 int must_show_header = 0;
3033
3034
3035 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3036 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3037 if (drv && drv->external)
3038 pgm = drv->external;
3039 }
3040
3041 if (msg) {
3042 /*
3043 * don't use colors when the header is intended for an
3044 * external diff driver
3045 */
3046 fill_metainfo(msg, name, other, one, two, o, p,
3047 &must_show_header,
3048 want_color(o->use_color) && !pgm);
3049 xfrm_msg = msg->len ? msg->buf : NULL;
3050 }
3051
3052 if (pgm) {
3053 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3054 complete_rewrite, o);
3055 return;
3056 }
3057 if (one && two)
3058 builtin_diff(name, other ? other : name,
3059 one, two, xfrm_msg, must_show_header,
3060 o, complete_rewrite);
3061 else
3062 fprintf(o->file, "* Unmerged path %s\n", name);
3063 }
3064
3065 static void diff_fill_sha1_info(struct diff_filespec *one)
3066 {
3067 if (DIFF_FILE_VALID(one)) {
3068 if (!one->sha1_valid) {
3069 struct stat st;
3070 if (one->is_stdin) {
3071 hashcpy(one->sha1, null_sha1);
3072 return;
3073 }
3074 if (lstat(one->path, &st) < 0)
3075 die_errno("stat '%s'", one->path);
3076 if (index_path(one->sha1, one->path, &st, 0))
3077 die("cannot hash %s", one->path);
3078 }
3079 }
3080 else
3081 hashclr(one->sha1);
3082 }
3083
3084 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3085 {
3086 /* Strip the prefix but do not molest /dev/null and absolute paths */
3087 if (*namep && **namep != '/') {
3088 *namep += prefix_length;
3089 if (**namep == '/')
3090 ++*namep;
3091 }
3092 if (*otherp && **otherp != '/') {
3093 *otherp += prefix_length;
3094 if (**otherp == '/')
3095 ++*otherp;
3096 }
3097 }
3098
3099 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3100 {
3101 const char *pgm = external_diff();
3102 struct strbuf msg;
3103 struct diff_filespec *one = p->one;
3104 struct diff_filespec *two = p->two;
3105 const char *name;
3106 const char *other;
3107 const char *attr_path;
3108
3109 name = p->one->path;
3110 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3111 attr_path = name;
3112 if (o->prefix_length)
3113 strip_prefix(o->prefix_length, &name, &other);
3114
3115 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3116 pgm = NULL;
3117
3118 if (DIFF_PAIR_UNMERGED(p)) {
3119 run_diff_cmd(pgm, name, NULL, attr_path,
3120 NULL, NULL, NULL, o, p);
3121 return;
3122 }
3123
3124 diff_fill_sha1_info(one);
3125 diff_fill_sha1_info(two);
3126
3127 if (!pgm &&
3128 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3129 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3130 /*
3131 * a filepair that changes between file and symlink
3132 * needs to be split into deletion and creation.
3133 */
3134 struct diff_filespec *null = alloc_filespec(two->path);
3135 run_diff_cmd(NULL, name, other, attr_path,
3136 one, null, &msg, o, p);
3137 free(null);
3138 strbuf_release(&msg);
3139
3140 null = alloc_filespec(one->path);
3141 run_diff_cmd(NULL, name, other, attr_path,
3142 null, two, &msg, o, p);
3143 free(null);
3144 }
3145 else
3146 run_diff_cmd(pgm, name, other, attr_path,
3147 one, two, &msg, o, p);
3148
3149 strbuf_release(&msg);
3150 }
3151
3152 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3153 struct diffstat_t *diffstat)
3154 {
3155 const char *name;
3156 const char *other;
3157
3158 if (DIFF_PAIR_UNMERGED(p)) {
3159 /* unmerged */
3160 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3161 return;
3162 }
3163
3164 name = p->one->path;
3165 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3166
3167 if (o->prefix_length)
3168 strip_prefix(o->prefix_length, &name, &other);
3169
3170 diff_fill_sha1_info(p->one);
3171 diff_fill_sha1_info(p->two);
3172
3173 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3174 }
3175
3176 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3177 {
3178 const char *name;
3179 const char *other;
3180 const char *attr_path;
3181
3182 if (DIFF_PAIR_UNMERGED(p)) {
3183 /* unmerged */
3184 return;
3185 }
3186
3187 name = p->one->path;
3188 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3189 attr_path = other ? other : name;
3190
3191 if (o->prefix_length)
3192 strip_prefix(o->prefix_length, &name, &other);
3193
3194 diff_fill_sha1_info(p->one);
3195 diff_fill_sha1_info(p->two);
3196
3197 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3198 }
3199
3200 void diff_setup(struct diff_options *options)
3201 {
3202 memcpy(options, &default_diff_options, sizeof(*options));
3203
3204 options->file = stdout;
3205
3206 options->line_termination = '\n';
3207 options->break_opt = -1;
3208 options->rename_limit = -1;
3209 options->dirstat_permille = diff_dirstat_permille_default;
3210 options->context = diff_context_default;
3211 DIFF_OPT_SET(options, RENAME_EMPTY);
3212
3213 options->change = diff_change;
3214 options->add_remove = diff_addremove;
3215 options->use_color = diff_use_color_default;
3216 options->detect_rename = diff_detect_rename_default;
3217 options->xdl_opts |= diff_algorithm;
3218
3219 options->orderfile = diff_order_file_cfg;
3220
3221 if (diff_no_prefix) {
3222 options->a_prefix = options->b_prefix = "";
3223 } else if (!diff_mnemonic_prefix) {
3224 options->a_prefix = "a/";
3225 options->b_prefix = "b/";
3226 }
3227 }
3228
3229 void diff_setup_done(struct diff_options *options)
3230 {
3231 int count = 0;
3232
3233 if (options->set_default)
3234 options->set_default(options);
3235
3236 if (options->output_format & DIFF_FORMAT_NAME)
3237 count++;
3238 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3239 count++;
3240 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3241 count++;
3242 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3243 count++;
3244 if (count > 1)
3245 die("--name-only, --name-status, --check and -s are mutually exclusive");
3246
3247 /*
3248 * Most of the time we can say "there are changes"
3249 * only by checking if there are changed paths, but
3250 * --ignore-whitespace* options force us to look
3251 * inside contents.
3252 */
3253
3254 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3255 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3256 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3257 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3258 else
3259 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3260
3261 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3262 options->detect_rename = DIFF_DETECT_COPY;
3263
3264 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3265 options->prefix = NULL;
3266 if (options->prefix)
3267 options->prefix_length = strlen(options->prefix);
3268 else
3269 options->prefix_length = 0;
3270
3271 if (options->output_format & (DIFF_FORMAT_NAME |
3272 DIFF_FORMAT_NAME_STATUS |
3273 DIFF_FORMAT_CHECKDIFF |
3274 DIFF_FORMAT_NO_OUTPUT))
3275 options->output_format &= ~(DIFF_FORMAT_RAW |
3276 DIFF_FORMAT_NUMSTAT |
3277 DIFF_FORMAT_DIFFSTAT |
3278 DIFF_FORMAT_SHORTSTAT |
3279 DIFF_FORMAT_DIRSTAT |
3280 DIFF_FORMAT_SUMMARY |
3281 DIFF_FORMAT_PATCH);
3282
3283 /*
3284 * These cases always need recursive; we do not drop caller-supplied
3285 * recursive bits for other formats here.
3286 */
3287 if (options->output_format & (DIFF_FORMAT_PATCH |
3288 DIFF_FORMAT_NUMSTAT |
3289 DIFF_FORMAT_DIFFSTAT |
3290 DIFF_FORMAT_SHORTSTAT |
3291 DIFF_FORMAT_DIRSTAT |
3292 DIFF_FORMAT_SUMMARY |
3293 DIFF_FORMAT_CHECKDIFF))
3294 DIFF_OPT_SET(options, RECURSIVE);
3295 /*
3296 * Also pickaxe would not work very well if you do not say recursive
3297 */
3298 if (options->pickaxe)
3299 DIFF_OPT_SET(options, RECURSIVE);
3300 /*
3301 * When patches are generated, submodules diffed against the work tree
3302 * must be checked for dirtiness too so it can be shown in the output
3303 */
3304 if (options->output_format & DIFF_FORMAT_PATCH)
3305 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3306
3307 if (options->detect_rename && options->rename_limit < 0)
3308 options->rename_limit = diff_rename_limit_default;
3309 if (options->setup & DIFF_SETUP_USE_CACHE) {
3310 if (!active_cache)
3311 /* read-cache does not die even when it fails
3312 * so it is safe for us to do this here. Also
3313 * it does not smudge active_cache or active_nr
3314 * when it fails, so we do not have to worry about
3315 * cleaning it up ourselves either.
3316 */
3317 read_cache();
3318 }
3319 if (options->abbrev <= 0 || 40 < options->abbrev)
3320 options->abbrev = 40; /* full */
3321
3322 /*
3323 * It does not make sense to show the first hit we happened
3324 * to have found. It does not make sense not to return with
3325 * exit code in such a case either.
3326 */
3327 if (DIFF_OPT_TST(options, QUICK)) {
3328 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3329 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3330 }
3331
3332 options->diff_path_counter = 0;
3333 }
3334
3335 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3336 {
3337 char c, *eq;
3338 int len;
3339
3340 if (*arg != '-')
3341 return 0;
3342 c = *++arg;
3343 if (!c)
3344 return 0;
3345 if (c == arg_short) {
3346 c = *++arg;
3347 if (!c)
3348 return 1;
3349 if (val && isdigit(c)) {
3350 char *end;
3351 int n = strtoul(arg, &end, 10);
3352 if (*end)
3353 return 0;
3354 *val = n;
3355 return 1;
3356 }
3357 return 0;
3358 }
3359 if (c != '-')
3360 return 0;
3361 arg++;
3362 eq = strchr(arg, '=');
3363 if (eq)
3364 len = eq - arg;
3365 else
3366 len = strlen(arg);
3367 if (!len || strncmp(arg, arg_long, len))
3368 return 0;
3369 if (eq) {
3370 int n;
3371 char *end;
3372 if (!isdigit(*++eq))
3373 return 0;
3374 n = strtoul(eq, &end, 10);
3375 if (*end)
3376 return 0;
3377 *val = n;
3378 }
3379 return 1;
3380 }
3381
3382 static int diff_scoreopt_parse(const char *opt);
3383
3384 static inline int short_opt(char opt, const char **argv,
3385 const char **optarg)
3386 {
3387 const char *arg = argv[0];
3388 if (arg[0] != '-' || arg[1] != opt)
3389 return 0;
3390 if (arg[2] != '\0') {
3391 *optarg = arg + 2;
3392 return 1;
3393 }
3394 if (!argv[1])
3395 die("Option '%c' requires a value", opt);
3396 *optarg = argv[1];
3397 return 2;
3398 }
3399
3400 int parse_long_opt(const char *opt, const char **argv,
3401 const char **optarg)
3402 {
3403 const char *arg = argv[0];
3404 if (arg[0] != '-' || arg[1] != '-')
3405 return 0;
3406 arg += strlen("--");
3407 if (!starts_with(arg, opt))
3408 return 0;
3409 arg += strlen(opt);
3410 if (*arg == '=') { /* stuck form: --option=value */
3411 *optarg = arg + 1;
3412 return 1;
3413 }
3414 if (*arg != '\0')
3415 return 0;
3416 /* separate form: --option value */
3417 if (!argv[1])
3418 die("Option '--%s' requires a value", opt);
3419 *optarg = argv[1];
3420 return 2;
3421 }
3422
3423 static int stat_opt(struct diff_options *options, const char **av)
3424 {
3425 const char *arg = av[0];
3426 char *end;
3427 int width = options->stat_width;
3428 int name_width = options->stat_name_width;
3429 int graph_width = options->stat_graph_width;
3430 int count = options->stat_count;
3431 int argcount = 1;
3432
3433 arg += strlen("--stat");
3434 end = (char *)arg;
3435
3436 switch (*arg) {
3437 case '-':
3438 if (starts_with(arg, "-width")) {
3439 arg += strlen("-width");
3440 if (*arg == '=')
3441 width = strtoul(arg + 1, &end, 10);
3442 else if (!*arg && !av[1])
3443 die("Option '--stat-width' requires a value");
3444 else if (!*arg) {
3445 width = strtoul(av[1], &end, 10);
3446 argcount = 2;
3447 }
3448 } else if (starts_with(arg, "-name-width")) {
3449 arg += strlen("-name-width");
3450 if (*arg == '=')
3451 name_width = strtoul(arg + 1, &end, 10);
3452 else if (!*arg && !av[1])
3453 die("Option '--stat-name-width' requires a value");
3454 else if (!*arg) {
3455 name_width = strtoul(av[1], &end, 10);
3456 argcount = 2;
3457 }
3458 } else if (starts_with(arg, "-graph-width")) {
3459 arg += strlen("-graph-width");
3460 if (*arg == '=')
3461 graph_width = strtoul(arg + 1, &end, 10);
3462 else if (!*arg && !av[1])
3463 die("Option '--stat-graph-width' requires a value");
3464 else if (!*arg) {
3465 graph_width = strtoul(av[1], &end, 10);
3466 argcount = 2;
3467 }
3468 } else if (starts_with(arg, "-count")) {
3469 arg += strlen("-count");
3470 if (*arg == '=')
3471 count = strtoul(arg + 1, &end, 10);
3472 else if (!*arg && !av[1])
3473 die("Option '--stat-count' requires a value");
3474 else if (!*arg) {
3475 count = strtoul(av[1], &end, 10);
3476 argcount = 2;
3477 }
3478 }
3479 break;
3480 case '=':
3481 width = strtoul(arg+1, &end, 10);
3482 if (*end == ',')
3483 name_width = strtoul(end+1, &end, 10);
3484 if (*end == ',')
3485 count = strtoul(end+1, &end, 10);
3486 }
3487
3488 /* Important! This checks all the error cases! */
3489 if (*end)
3490 return 0;
3491 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3492 options->stat_name_width = name_width;
3493 options->stat_graph_width = graph_width;
3494 options->stat_width = width;
3495 options->stat_count = count;
3496 return argcount;
3497 }
3498
3499 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3500 {
3501 struct strbuf errmsg = STRBUF_INIT;
3502 if (parse_dirstat_params(options, params, &errmsg))
3503 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3504 errmsg.buf);
3505 strbuf_release(&errmsg);
3506 /*
3507 * The caller knows a dirstat-related option is given from the command
3508 * line; allow it to say "return this_function();"
3509 */
3510 options->output_format |= DIFF_FORMAT_DIRSTAT;
3511 return 1;
3512 }
3513
3514 static int parse_submodule_opt(struct diff_options *options, const char *value)
3515 {
3516 if (parse_submodule_params(options, value))
3517 die(_("Failed to parse --submodule option parameter: '%s'"),
3518 value);
3519 return 1;
3520 }
3521
3522 static const char diff_status_letters[] = {
3523 DIFF_STATUS_ADDED,
3524 DIFF_STATUS_COPIED,
3525 DIFF_STATUS_DELETED,
3526 DIFF_STATUS_MODIFIED,
3527 DIFF_STATUS_RENAMED,
3528 DIFF_STATUS_TYPE_CHANGED,
3529 DIFF_STATUS_UNKNOWN,
3530 DIFF_STATUS_UNMERGED,
3531 DIFF_STATUS_FILTER_AON,
3532 DIFF_STATUS_FILTER_BROKEN,
3533 '\0',
3534 };
3535
3536 static unsigned int filter_bit['Z' + 1];
3537
3538 static void prepare_filter_bits(void)
3539 {
3540 int i;
3541
3542 if (!filter_bit[DIFF_STATUS_ADDED]) {
3543 for (i = 0; diff_status_letters[i]; i++)
3544 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3545 }
3546 }
3547
3548 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3549 {
3550 return opt->filter & filter_bit[(int) status];
3551 }
3552
3553 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3554 {
3555 int i, optch;
3556
3557 prepare_filter_bits();
3558
3559 /*
3560 * If there is a negation e.g. 'd' in the input, and we haven't
3561 * initialized the filter field with another --diff-filter, start
3562 * from full set of bits, except for AON.
3563 */
3564 if (!opt->filter) {
3565 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3566 if (optch < 'a' || 'z' < optch)
3567 continue;
3568 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3569 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3570 break;
3571 }
3572 }
3573
3574 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3575 unsigned int bit;
3576 int negate;
3577
3578 if ('a' <= optch && optch <= 'z') {
3579 negate = 1;
3580 optch = toupper(optch);
3581 } else {
3582 negate = 0;
3583 }
3584
3585 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3586 if (!bit)
3587 return optarg[i];
3588 if (negate)
3589 opt->filter &= ~bit;
3590 else
3591 opt->filter |= bit;
3592 }
3593 return 0;
3594 }
3595
3596 /* Used only by "diff-files" and "diff --no-index" */
3597 void handle_deprecated_show_diff_q(struct diff_options *opt)
3598 {
3599 warning("'diff -q' and 'diff-files -q' are deprecated.");
3600 warning("Use 'diff --diff-filter=d' instead to ignore deleted filepairs.");
3601 parse_diff_filter_opt("d", opt);
3602 }
3603
3604 static void enable_patch_output(int *fmt) {
3605 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3606 *fmt |= DIFF_FORMAT_PATCH;
3607 }
3608
3609 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3610 {
3611 const char *arg = av[0];
3612 const char *optarg;
3613 int argcount;
3614
3615 /* Output format options */
3616 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3617 || opt_arg(arg, 'U', "unified", &options->context))
3618 enable_patch_output(&options->output_format);
3619 else if (!strcmp(arg, "--raw"))
3620 options->output_format |= DIFF_FORMAT_RAW;
3621 else if (!strcmp(arg, "--patch-with-raw")) {
3622 enable_patch_output(&options->output_format);
3623 options->output_format |= DIFF_FORMAT_RAW;
3624 } else if (!strcmp(arg, "--numstat"))
3625 options->output_format |= DIFF_FORMAT_NUMSTAT;
3626 else if (!strcmp(arg, "--shortstat"))
3627 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3628 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3629 return parse_dirstat_opt(options, "");
3630 else if (starts_with(arg, "-X"))
3631 return parse_dirstat_opt(options, arg + 2);
3632 else if (starts_with(arg, "--dirstat="))
3633 return parse_dirstat_opt(options, arg + 10);
3634 else if (!strcmp(arg, "--cumulative"))
3635 return parse_dirstat_opt(options, "cumulative");
3636 else if (!strcmp(arg, "--dirstat-by-file"))
3637 return parse_dirstat_opt(options, "files");
3638 else if (starts_with(arg, "--dirstat-by-file=")) {
3639 parse_dirstat_opt(options, "files");
3640 return parse_dirstat_opt(options, arg + 18);
3641 }
3642 else if (!strcmp(arg, "--check"))
3643 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3644 else if (!strcmp(arg, "--summary"))
3645 options->output_format |= DIFF_FORMAT_SUMMARY;
3646 else if (!strcmp(arg, "--patch-with-stat")) {
3647 enable_patch_output(&options->output_format);
3648 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3649 } else if (!strcmp(arg, "--name-only"))
3650 options->output_format |= DIFF_FORMAT_NAME;
3651 else if (!strcmp(arg, "--name-status"))
3652 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3653 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3654 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3655 else if (starts_with(arg, "--stat"))
3656 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3657 return stat_opt(options, av);
3658
3659 /* renames options */
3660 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3661 !strcmp(arg, "--break-rewrites")) {
3662 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3663 return error("invalid argument to -B: %s", arg+2);
3664 }
3665 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3666 !strcmp(arg, "--find-renames")) {
3667 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3668 return error("invalid argument to -M: %s", arg+2);
3669 options->detect_rename = DIFF_DETECT_RENAME;
3670 }
3671 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3672 options->irreversible_delete = 1;
3673 }
3674 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3675 !strcmp(arg, "--find-copies")) {
3676 if (options->detect_rename == DIFF_DETECT_COPY)
3677 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3678 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3679 return error("invalid argument to -C: %s", arg+2);
3680 options->detect_rename = DIFF_DETECT_COPY;
3681 }
3682 else if (!strcmp(arg, "--no-renames"))
3683 options->detect_rename = 0;
3684 else if (!strcmp(arg, "--rename-empty"))
3685 DIFF_OPT_SET(options, RENAME_EMPTY);
3686 else if (!strcmp(arg, "--no-rename-empty"))
3687 DIFF_OPT_CLR(options, RENAME_EMPTY);
3688 else if (!strcmp(arg, "--relative"))
3689 DIFF_OPT_SET(options, RELATIVE_NAME);
3690 else if (starts_with(arg, "--relative=")) {
3691 DIFF_OPT_SET(options, RELATIVE_NAME);
3692 options->prefix = arg + 11;
3693 }
3694
3695 /* xdiff options */
3696 else if (!strcmp(arg, "--minimal"))
3697 DIFF_XDL_SET(options, NEED_MINIMAL);
3698 else if (!strcmp(arg, "--no-minimal"))
3699 DIFF_XDL_CLR(options, NEED_MINIMAL);
3700 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3701 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3702 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3703 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3704 else if (!strcmp(arg, "--ignore-space-at-eol"))
3705 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3706 else if (!strcmp(arg, "--ignore-blank-lines"))
3707 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3708 else if (!strcmp(arg, "--patience"))
3709 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3710 else if (!strcmp(arg, "--histogram"))
3711 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3712 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3713 long value = parse_algorithm_value(optarg);
3714 if (value < 0)
3715 return error("option diff-algorithm accepts \"myers\", "
3716 "\"minimal\", \"patience\" and \"histogram\"");
3717 /* clear out previous settings */
3718 DIFF_XDL_CLR(options, NEED_MINIMAL);
3719 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3720 options->xdl_opts |= value;
3721 return argcount;
3722 }
3723
3724 /* flags options */
3725 else if (!strcmp(arg, "--binary")) {
3726 enable_patch_output(&options->output_format);
3727 DIFF_OPT_SET(options, BINARY);
3728 }
3729 else if (!strcmp(arg, "--full-index"))
3730 DIFF_OPT_SET(options, FULL_INDEX);
3731 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3732 DIFF_OPT_SET(options, TEXT);
3733 else if (!strcmp(arg, "-R"))
3734 DIFF_OPT_SET(options, REVERSE_DIFF);
3735 else if (!strcmp(arg, "--find-copies-harder"))
3736 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3737 else if (!strcmp(arg, "--follow"))
3738 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3739 else if (!strcmp(arg, "--no-follow"))
3740 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3741 else if (!strcmp(arg, "--color"))
3742 options->use_color = 1;
3743 else if (starts_with(arg, "--color=")) {
3744 int value = git_config_colorbool(NULL, arg+8);
3745 if (value < 0)
3746 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3747 options->use_color = value;
3748 }
3749 else if (!strcmp(arg, "--no-color"))
3750 options->use_color = 0;
3751 else if (!strcmp(arg, "--color-words")) {
3752 options->use_color = 1;
3753 options->word_diff = DIFF_WORDS_COLOR;
3754 }
3755 else if (starts_with(arg, "--color-words=")) {
3756 options->use_color = 1;
3757 options->word_diff = DIFF_WORDS_COLOR;
3758 options->word_regex = arg + 14;
3759 }
3760 else if (!strcmp(arg, "--word-diff")) {
3761 if (options->word_diff == DIFF_WORDS_NONE)
3762 options->word_diff = DIFF_WORDS_PLAIN;
3763 }
3764 else if (starts_with(arg, "--word-diff=")) {
3765 const char *type = arg + 12;
3766 if (!strcmp(type, "plain"))
3767 options->word_diff = DIFF_WORDS_PLAIN;
3768 else if (!strcmp(type, "color")) {
3769 options->use_color = 1;
3770 options->word_diff = DIFF_WORDS_COLOR;
3771 }
3772 else if (!strcmp(type, "porcelain"))
3773 options->word_diff = DIFF_WORDS_PORCELAIN;
3774 else if (!strcmp(type, "none"))
3775 options->word_diff = DIFF_WORDS_NONE;
3776 else
3777 die("bad --word-diff argument: %s", type);
3778 }
3779 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3780 if (options->word_diff == DIFF_WORDS_NONE)
3781 options->word_diff = DIFF_WORDS_PLAIN;
3782 options->word_regex = optarg;
3783 return argcount;
3784 }
3785 else if (!strcmp(arg, "--exit-code"))
3786 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3787 else if (!strcmp(arg, "--quiet"))
3788 DIFF_OPT_SET(options, QUICK);
3789 else if (!strcmp(arg, "--ext-diff"))
3790 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3791 else if (!strcmp(arg, "--no-ext-diff"))
3792 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3793 else if (!strcmp(arg, "--textconv"))
3794 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3795 else if (!strcmp(arg, "--no-textconv"))
3796 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3797 else if (!strcmp(arg, "--ignore-submodules")) {
3798 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3799 handle_ignore_submodules_arg(options, "all");
3800 } else if (starts_with(arg, "--ignore-submodules=")) {
3801 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3802 handle_ignore_submodules_arg(options, arg + 20);
3803 } else if (!strcmp(arg, "--submodule"))
3804 DIFF_OPT_SET(options, SUBMODULE_LOG);
3805 else if (starts_with(arg, "--submodule="))
3806 return parse_submodule_opt(options, arg + 12);
3807
3808 /* misc options */
3809 else if (!strcmp(arg, "-z"))
3810 options->line_termination = 0;
3811 else if ((argcount = short_opt('l', av, &optarg))) {
3812 options->rename_limit = strtoul(optarg, NULL, 10);
3813 return argcount;
3814 }
3815 else if ((argcount = short_opt('S', av, &optarg))) {
3816 options->pickaxe = optarg;
3817 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3818 return argcount;
3819 } else if ((argcount = short_opt('G', av, &optarg))) {
3820 options->pickaxe = optarg;
3821 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3822 return argcount;
3823 }
3824 else if (!strcmp(arg, "--pickaxe-all"))
3825 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3826 else if (!strcmp(arg, "--pickaxe-regex"))
3827 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3828 else if ((argcount = short_opt('O', av, &optarg))) {
3829 options->orderfile = optarg;
3830 return argcount;
3831 }
3832 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3833 int offending = parse_diff_filter_opt(optarg, options);
3834 if (offending)
3835 die("unknown change class '%c' in --diff-filter=%s",
3836 offending, optarg);
3837 return argcount;
3838 }
3839 else if (!strcmp(arg, "--abbrev"))
3840 options->abbrev = DEFAULT_ABBREV;
3841 else if (starts_with(arg, "--abbrev=")) {
3842 options->abbrev = strtoul(arg + 9, NULL, 10);
3843 if (options->abbrev < MINIMUM_ABBREV)
3844 options->abbrev = MINIMUM_ABBREV;
3845 else if (40 < options->abbrev)
3846 options->abbrev = 40;
3847 }
3848 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3849 options->a_prefix = optarg;
3850 return argcount;
3851 }
3852 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3853 options->b_prefix = optarg;
3854 return argcount;
3855 }
3856 else if (!strcmp(arg, "--no-prefix"))
3857 options->a_prefix = options->b_prefix = "";
3858 else if (opt_arg(arg, '\0', "inter-hunk-context",
3859 &options->interhunkcontext))
3860 ;
3861 else if (!strcmp(arg, "-W"))
3862 DIFF_OPT_SET(options, FUNCCONTEXT);
3863 else if (!strcmp(arg, "--function-context"))
3864 DIFF_OPT_SET(options, FUNCCONTEXT);
3865 else if (!strcmp(arg, "--no-function-context"))
3866 DIFF_OPT_CLR(options, FUNCCONTEXT);
3867 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3868 options->file = fopen(optarg, "w");
3869 if (!options->file)
3870 die_errno("Could not open '%s'", optarg);
3871 options->close_file = 1;
3872 return argcount;
3873 } else
3874 return 0;
3875 return 1;
3876 }
3877
3878 int parse_rename_score(const char **cp_p)
3879 {
3880 unsigned long num, scale;
3881 int ch, dot;
3882 const char *cp = *cp_p;
3883
3884 num = 0;
3885 scale = 1;
3886 dot = 0;
3887 for (;;) {
3888 ch = *cp;
3889 if ( !dot && ch == '.' ) {
3890 scale = 1;
3891 dot = 1;
3892 } else if ( ch == '%' ) {
3893 scale = dot ? scale*100 : 100;
3894 cp++; /* % is always at the end */
3895 break;
3896 } else if ( ch >= '0' && ch <= '9' ) {
3897 if ( scale < 100000 ) {
3898 scale *= 10;
3899 num = (num*10) + (ch-'0');
3900 }
3901 } else {
3902 break;
3903 }
3904 cp++;
3905 }
3906 *cp_p = cp;
3907
3908 /* user says num divided by scale and we say internally that
3909 * is MAX_SCORE * num / scale.
3910 */
3911 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3912 }
3913
3914 static int diff_scoreopt_parse(const char *opt)
3915 {
3916 int opt1, opt2, cmd;
3917
3918 if (*opt++ != '-')
3919 return -1;
3920 cmd = *opt++;
3921 if (cmd == '-') {
3922 /* convert the long-form arguments into short-form versions */
3923 if (starts_with(opt, "break-rewrites")) {
3924 opt += strlen("break-rewrites");
3925 if (*opt == 0 || *opt++ == '=')
3926 cmd = 'B';
3927 } else if (starts_with(opt, "find-copies")) {
3928 opt += strlen("find-copies");
3929 if (*opt == 0 || *opt++ == '=')
3930 cmd = 'C';
3931 } else if (starts_with(opt, "find-renames")) {
3932 opt += strlen("find-renames");
3933 if (*opt == 0 || *opt++ == '=')
3934 cmd = 'M';
3935 }
3936 }
3937 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3938 return -1; /* that is not a -M, -C, or -B option */
3939
3940 opt1 = parse_rename_score(&opt);
3941 if (cmd != 'B')
3942 opt2 = 0;
3943 else {
3944 if (*opt == 0)
3945 opt2 = 0;
3946 else if (*opt != '/')
3947 return -1; /* we expect -B80/99 or -B80 */
3948 else {
3949 opt++;
3950 opt2 = parse_rename_score(&opt);
3951 }
3952 }
3953 if (*opt != 0)
3954 return -1;
3955 return opt1 | (opt2 << 16);
3956 }
3957
3958 struct diff_queue_struct diff_queued_diff;
3959
3960 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3961 {
3962 if (queue->alloc <= queue->nr) {
3963 queue->alloc = alloc_nr(queue->alloc);
3964 queue->queue = xrealloc(queue->queue,
3965 sizeof(dp) * queue->alloc);
3966 }
3967 queue->queue[queue->nr++] = dp;
3968 }
3969
3970 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3971 struct diff_filespec *one,
3972 struct diff_filespec *two)
3973 {
3974 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3975 dp->one = one;
3976 dp->two = two;
3977 if (queue)
3978 diff_q(queue, dp);
3979 return dp;
3980 }
3981
3982 void diff_free_filepair(struct diff_filepair *p)
3983 {
3984 free_filespec(p->one);
3985 free_filespec(p->two);
3986 free(p);
3987 }
3988
3989 /* This is different from find_unique_abbrev() in that
3990 * it stuffs the result with dots for alignment.
3991 */
3992 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3993 {
3994 int abblen;
3995 const char *abbrev;
3996 if (len == 40)
3997 return sha1_to_hex(sha1);
3998
3999 abbrev = find_unique_abbrev(sha1, len);
4000 abblen = strlen(abbrev);
4001 if (abblen < 37) {
4002 static char hex[41];
4003 if (len < abblen && abblen <= len + 2)
4004 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
4005 else
4006 sprintf(hex, "%s...", abbrev);
4007 return hex;
4008 }
4009 return sha1_to_hex(sha1);
4010 }
4011
4012 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4013 {
4014 int line_termination = opt->line_termination;
4015 int inter_name_termination = line_termination ? '\t' : '\0';
4016
4017 fprintf(opt->file, "%s", diff_line_prefix(opt));
4018 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4019 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4020 diff_unique_abbrev(p->one->sha1, opt->abbrev));
4021 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
4022 }
4023 if (p->score) {
4024 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4025 inter_name_termination);
4026 } else {
4027 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4028 }
4029
4030 if (p->status == DIFF_STATUS_COPIED ||
4031 p->status == DIFF_STATUS_RENAMED) {
4032 const char *name_a, *name_b;
4033 name_a = p->one->path;
4034 name_b = p->two->path;
4035 strip_prefix(opt->prefix_length, &name_a, &name_b);
4036 write_name_quoted(name_a, opt->file, inter_name_termination);
4037 write_name_quoted(name_b, opt->file, line_termination);
4038 } else {
4039 const char *name_a, *name_b;
4040 name_a = p->one->mode ? p->one->path : p->two->path;
4041 name_b = NULL;
4042 strip_prefix(opt->prefix_length, &name_a, &name_b);
4043 write_name_quoted(name_a, opt->file, line_termination);
4044 }
4045 }
4046
4047 int diff_unmodified_pair(struct diff_filepair *p)
4048 {
4049 /* This function is written stricter than necessary to support
4050 * the currently implemented transformers, but the idea is to
4051 * let transformers to produce diff_filepairs any way they want,
4052 * and filter and clean them up here before producing the output.
4053 */
4054 struct diff_filespec *one = p->one, *two = p->two;
4055
4056 if (DIFF_PAIR_UNMERGED(p))
4057 return 0; /* unmerged is interesting */
4058
4059 /* deletion, addition, mode or type change
4060 * and rename are all interesting.
4061 */
4062 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4063 DIFF_PAIR_MODE_CHANGED(p) ||
4064 strcmp(one->path, two->path))
4065 return 0;
4066
4067 /* both are valid and point at the same path. that is, we are
4068 * dealing with a change.
4069 */
4070 if (one->sha1_valid && two->sha1_valid &&
4071 !hashcmp(one->sha1, two->sha1) &&
4072 !one->dirty_submodule && !two->dirty_submodule)
4073 return 1; /* no change */
4074 if (!one->sha1_valid && !two->sha1_valid)
4075 return 1; /* both look at the same file on the filesystem. */
4076 return 0;
4077 }
4078
4079 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4080 {
4081 if (diff_unmodified_pair(p))
4082 return;
4083
4084 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4085 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4086 return; /* no tree diffs in patch format */
4087
4088 run_diff(p, o);
4089 }
4090
4091 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4092 struct diffstat_t *diffstat)
4093 {
4094 if (diff_unmodified_pair(p))
4095 return;
4096
4097 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4098 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4099 return; /* no useful stat for tree diffs */
4100
4101 run_diffstat(p, o, diffstat);
4102 }
4103
4104 static void diff_flush_checkdiff(struct diff_filepair *p,
4105 struct diff_options *o)
4106 {
4107 if (diff_unmodified_pair(p))
4108 return;
4109
4110 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4111 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4112 return; /* nothing to check in tree diffs */
4113
4114 run_checkdiff(p, o);
4115 }
4116
4117 int diff_queue_is_empty(void)
4118 {
4119 struct diff_queue_struct *q = &diff_queued_diff;
4120 int i;
4121 for (i = 0; i < q->nr; i++)
4122 if (!diff_unmodified_pair(q->queue[i]))
4123 return 0;
4124 return 1;
4125 }
4126
4127 #if DIFF_DEBUG
4128 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4129 {
4130 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4131 x, one ? one : "",
4132 s->path,
4133 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4134 s->mode,
4135 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4136 fprintf(stderr, "queue[%d] %s size %lu\n",
4137 x, one ? one : "",
4138 s->size);
4139 }
4140
4141 void diff_debug_filepair(const struct diff_filepair *p, int i)
4142 {
4143 diff_debug_filespec(p->one, i, "one");
4144 diff_debug_filespec(p->two, i, "two");
4145 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4146 p->score, p->status ? p->status : '?',
4147 p->one->rename_used, p->broken_pair);
4148 }
4149
4150 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4151 {
4152 int i;
4153 if (msg)
4154 fprintf(stderr, "%s\n", msg);
4155 fprintf(stderr, "q->nr = %d\n", q->nr);
4156 for (i = 0; i < q->nr; i++) {
4157 struct diff_filepair *p = q->queue[i];
4158 diff_debug_filepair(p, i);
4159 }
4160 }
4161 #endif
4162
4163 static void diff_resolve_rename_copy(void)
4164 {
4165 int i;
4166 struct diff_filepair *p;
4167 struct diff_queue_struct *q = &diff_queued_diff;
4168
4169 diff_debug_queue("resolve-rename-copy", q);
4170
4171 for (i = 0; i < q->nr; i++) {
4172 p = q->queue[i];
4173 p->status = 0; /* undecided */
4174 if (DIFF_PAIR_UNMERGED(p))
4175 p->status = DIFF_STATUS_UNMERGED;
4176 else if (!DIFF_FILE_VALID(p->one))
4177 p->status = DIFF_STATUS_ADDED;
4178 else if (!DIFF_FILE_VALID(p->two))
4179 p->status = DIFF_STATUS_DELETED;
4180 else if (DIFF_PAIR_TYPE_CHANGED(p))
4181 p->status = DIFF_STATUS_TYPE_CHANGED;
4182
4183 /* from this point on, we are dealing with a pair
4184 * whose both sides are valid and of the same type, i.e.
4185 * either in-place edit or rename/copy edit.
4186 */
4187 else if (DIFF_PAIR_RENAME(p)) {
4188 /*
4189 * A rename might have re-connected a broken
4190 * pair up, causing the pathnames to be the
4191 * same again. If so, that's not a rename at
4192 * all, just a modification..
4193 *
4194 * Otherwise, see if this source was used for
4195 * multiple renames, in which case we decrement
4196 * the count, and call it a copy.
4197 */
4198 if (!strcmp(p->one->path, p->two->path))
4199 p->status = DIFF_STATUS_MODIFIED;
4200 else if (--p->one->rename_used > 0)
4201 p->status = DIFF_STATUS_COPIED;
4202 else
4203 p->status = DIFF_STATUS_RENAMED;
4204 }
4205 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4206 p->one->mode != p->two->mode ||
4207 p->one->dirty_submodule ||
4208 p->two->dirty_submodule ||
4209 is_null_sha1(p->one->sha1))
4210 p->status = DIFF_STATUS_MODIFIED;
4211 else {
4212 /* This is a "no-change" entry and should not
4213 * happen anymore, but prepare for broken callers.
4214 */
4215 error("feeding unmodified %s to diffcore",
4216 p->one->path);
4217 p->status = DIFF_STATUS_UNKNOWN;
4218 }
4219 }
4220 diff_debug_queue("resolve-rename-copy done", q);
4221 }
4222
4223 static int check_pair_status(struct diff_filepair *p)
4224 {
4225 switch (p->status) {
4226 case DIFF_STATUS_UNKNOWN:
4227 return 0;
4228 case 0:
4229 die("internal error in diff-resolve-rename-copy");
4230 default:
4231 return 1;
4232 }
4233 }
4234
4235 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4236 {
4237 int fmt = opt->output_format;
4238
4239 if (fmt & DIFF_FORMAT_CHECKDIFF)
4240 diff_flush_checkdiff(p, opt);
4241 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4242 diff_flush_raw(p, opt);
4243 else if (fmt & DIFF_FORMAT_NAME) {
4244 const char *name_a, *name_b;
4245 name_a = p->two->path;
4246 name_b = NULL;
4247 strip_prefix(opt->prefix_length, &name_a, &name_b);
4248 write_name_quoted(name_a, opt->file, opt->line_termination);
4249 }
4250 }
4251
4252 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4253 {
4254 if (fs->mode)
4255 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4256 else
4257 fprintf(file, " %s ", newdelete);
4258 write_name_quoted(fs->path, file, '\n');
4259 }
4260
4261
4262 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4263 const char *line_prefix)
4264 {
4265 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4266 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4267 p->two->mode, show_name ? ' ' : '\n');
4268 if (show_name) {
4269 write_name_quoted(p->two->path, file, '\n');
4270 }
4271 }
4272 }
4273
4274 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4275 const char *line_prefix)
4276 {
4277 char *names = pprint_rename(p->one->path, p->two->path);
4278
4279 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4280 free(names);
4281 show_mode_change(file, p, 0, line_prefix);
4282 }
4283
4284 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4285 {
4286 FILE *file = opt->file;
4287 const char *line_prefix = diff_line_prefix(opt);
4288
4289 switch(p->status) {
4290 case DIFF_STATUS_DELETED:
4291 fputs(line_prefix, file);
4292 show_file_mode_name(file, "delete", p->one);
4293 break;
4294 case DIFF_STATUS_ADDED:
4295 fputs(line_prefix, file);
4296 show_file_mode_name(file, "create", p->two);
4297 break;
4298 case DIFF_STATUS_COPIED:
4299 fputs(line_prefix, file);
4300 show_rename_copy(file, "copy", p, line_prefix);
4301 break;
4302 case DIFF_STATUS_RENAMED:
4303 fputs(line_prefix, file);
4304 show_rename_copy(file, "rename", p, line_prefix);
4305 break;
4306 default:
4307 if (p->score) {
4308 fprintf(file, "%s rewrite ", line_prefix);
4309 write_name_quoted(p->two->path, file, ' ');
4310 fprintf(file, "(%d%%)\n", similarity_index(p));
4311 }
4312 show_mode_change(file, p, !p->score, line_prefix);
4313 break;
4314 }
4315 }
4316
4317 struct patch_id_t {
4318 git_SHA_CTX *ctx;
4319 int patchlen;
4320 };
4321
4322 static int remove_space(char *line, int len)
4323 {
4324 int i;
4325 char *dst = line;
4326 unsigned char c;
4327
4328 for (i = 0; i < len; i++)
4329 if (!isspace((c = line[i])))
4330 *dst++ = c;
4331
4332 return dst - line;
4333 }
4334
4335 static void patch_id_consume(void *priv, char *line, unsigned long len)
4336 {
4337 struct patch_id_t *data = priv;
4338 int new_len;
4339
4340 /* Ignore line numbers when computing the SHA1 of the patch */
4341 if (starts_with(line, "@@ -"))
4342 return;
4343
4344 new_len = remove_space(line, len);
4345
4346 git_SHA1_Update(data->ctx, line, new_len);
4347 data->patchlen += new_len;
4348 }
4349
4350 /* returns 0 upon success, and writes result into sha1 */
4351 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4352 {
4353 struct diff_queue_struct *q = &diff_queued_diff;
4354 int i;
4355 git_SHA_CTX ctx;
4356 struct patch_id_t data;
4357 char buffer[PATH_MAX * 4 + 20];
4358
4359 git_SHA1_Init(&ctx);
4360 memset(&data, 0, sizeof(struct patch_id_t));
4361 data.ctx = &ctx;
4362
4363 for (i = 0; i < q->nr; i++) {
4364 xpparam_t xpp;
4365 xdemitconf_t xecfg;
4366 mmfile_t mf1, mf2;
4367 struct diff_filepair *p = q->queue[i];
4368 int len1, len2;
4369
4370 memset(&xpp, 0, sizeof(xpp));
4371 memset(&xecfg, 0, sizeof(xecfg));
4372 if (p->status == 0)
4373 return error("internal diff status error");
4374 if (p->status == DIFF_STATUS_UNKNOWN)
4375 continue;
4376 if (diff_unmodified_pair(p))
4377 continue;
4378 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4379 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4380 continue;
4381 if (DIFF_PAIR_UNMERGED(p))
4382 continue;
4383
4384 diff_fill_sha1_info(p->one);
4385 diff_fill_sha1_info(p->two);
4386 if (fill_mmfile(&mf1, p->one) < 0 ||
4387 fill_mmfile(&mf2, p->two) < 0)
4388 return error("unable to read files to diff");
4389
4390 len1 = remove_space(p->one->path, strlen(p->one->path));
4391 len2 = remove_space(p->two->path, strlen(p->two->path));
4392 if (p->one->mode == 0)
4393 len1 = snprintf(buffer, sizeof(buffer),
4394 "diff--gita/%.*sb/%.*s"
4395 "newfilemode%06o"
4396 "---/dev/null"
4397 "+++b/%.*s",
4398 len1, p->one->path,
4399 len2, p->two->path,
4400 p->two->mode,
4401 len2, p->two->path);
4402 else if (p->two->mode == 0)
4403 len1 = snprintf(buffer, sizeof(buffer),
4404 "diff--gita/%.*sb/%.*s"
4405 "deletedfilemode%06o"
4406 "---a/%.*s"
4407 "+++/dev/null",
4408 len1, p->one->path,
4409 len2, p->two->path,
4410 p->one->mode,
4411 len1, p->one->path);
4412 else
4413 len1 = snprintf(buffer, sizeof(buffer),
4414 "diff--gita/%.*sb/%.*s"
4415 "---a/%.*s"
4416 "+++b/%.*s",
4417 len1, p->one->path,
4418 len2, p->two->path,
4419 len1, p->one->path,
4420 len2, p->two->path);
4421 git_SHA1_Update(&ctx, buffer, len1);
4422
4423 if (diff_filespec_is_binary(p->one) ||
4424 diff_filespec_is_binary(p->two)) {
4425 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4426 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4427 continue;
4428 }
4429
4430 xpp.flags = 0;
4431 xecfg.ctxlen = 3;
4432 xecfg.flags = 0;
4433 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4434 &xpp, &xecfg);
4435 }
4436
4437 git_SHA1_Final(sha1, &ctx);
4438 return 0;
4439 }
4440
4441 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4442 {
4443 struct diff_queue_struct *q = &diff_queued_diff;
4444 int i;
4445 int result = diff_get_patch_id(options, sha1);
4446
4447 for (i = 0; i < q->nr; i++)
4448 diff_free_filepair(q->queue[i]);
4449
4450 free(q->queue);
4451 DIFF_QUEUE_CLEAR(q);
4452
4453 return result;
4454 }
4455
4456 static int is_summary_empty(const struct diff_queue_struct *q)
4457 {
4458 int i;
4459
4460 for (i = 0; i < q->nr; i++) {
4461 const struct diff_filepair *p = q->queue[i];
4462
4463 switch (p->status) {
4464 case DIFF_STATUS_DELETED:
4465 case DIFF_STATUS_ADDED:
4466 case DIFF_STATUS_COPIED:
4467 case DIFF_STATUS_RENAMED:
4468 return 0;
4469 default:
4470 if (p->score)
4471 return 0;
4472 if (p->one->mode && p->two->mode &&
4473 p->one->mode != p->two->mode)
4474 return 0;
4475 break;
4476 }
4477 }
4478 return 1;
4479 }
4480
4481 static const char rename_limit_warning[] =
4482 "inexact rename detection was skipped due to too many files.";
4483
4484 static const char degrade_cc_to_c_warning[] =
4485 "only found copies from modified paths due to too many files.";
4486
4487 static const char rename_limit_advice[] =
4488 "you may want to set your %s variable to at least "
4489 "%d and retry the command.";
4490
4491 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4492 {
4493 if (degraded_cc)
4494 warning(degrade_cc_to_c_warning);
4495 else if (needed)
4496 warning(rename_limit_warning);
4497 else
4498 return;
4499 if (0 < needed && needed < 32767)
4500 warning(rename_limit_advice, varname, needed);
4501 }
4502
4503 void diff_flush(struct diff_options *options)
4504 {
4505 struct diff_queue_struct *q = &diff_queued_diff;
4506 int i, output_format = options->output_format;
4507 int separator = 0;
4508 int dirstat_by_line = 0;
4509
4510 /*
4511 * Order: raw, stat, summary, patch
4512 * or: name/name-status/checkdiff (other bits clear)
4513 */
4514 if (!q->nr)
4515 goto free_queue;
4516
4517 if (output_format & (DIFF_FORMAT_RAW |
4518 DIFF_FORMAT_NAME |
4519 DIFF_FORMAT_NAME_STATUS |
4520 DIFF_FORMAT_CHECKDIFF)) {
4521 for (i = 0; i < q->nr; i++) {
4522 struct diff_filepair *p = q->queue[i];
4523 if (check_pair_status(p))
4524 flush_one_pair(p, options);
4525 }
4526 separator++;
4527 }
4528
4529 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4530 dirstat_by_line = 1;
4531
4532 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4533 dirstat_by_line) {
4534 struct diffstat_t diffstat;
4535
4536 memset(&diffstat, 0, sizeof(struct diffstat_t));
4537 for (i = 0; i < q->nr; i++) {
4538 struct diff_filepair *p = q->queue[i];
4539 if (check_pair_status(p))
4540 diff_flush_stat(p, options, &diffstat);
4541 }
4542 if (output_format & DIFF_FORMAT_NUMSTAT)
4543 show_numstat(&diffstat, options);
4544 if (output_format & DIFF_FORMAT_DIFFSTAT)
4545 show_stats(&diffstat, options);
4546 if (output_format & DIFF_FORMAT_SHORTSTAT)
4547 show_shortstats(&diffstat, options);
4548 if (output_format & DIFF_FORMAT_DIRSTAT)
4549 show_dirstat_by_line(&diffstat, options);
4550 free_diffstat_info(&diffstat);
4551 separator++;
4552 }
4553 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4554 show_dirstat(options);
4555
4556 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4557 for (i = 0; i < q->nr; i++) {
4558 diff_summary(options, q->queue[i]);
4559 }
4560 separator++;
4561 }
4562
4563 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4564 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4565 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4566 /*
4567 * run diff_flush_patch for the exit status. setting
4568 * options->file to /dev/null should be safe, because we
4569 * aren't supposed to produce any output anyway.
4570 */
4571 if (options->close_file)
4572 fclose(options->file);
4573 options->file = fopen("/dev/null", "w");
4574 if (!options->file)
4575 die_errno("Could not open /dev/null");
4576 options->close_file = 1;
4577 for (i = 0; i < q->nr; i++) {
4578 struct diff_filepair *p = q->queue[i];
4579 if (check_pair_status(p))
4580 diff_flush_patch(p, options);
4581 if (options->found_changes)
4582 break;
4583 }
4584 }
4585
4586 if (output_format & DIFF_FORMAT_PATCH) {
4587 if (separator) {
4588 fprintf(options->file, "%s%c",
4589 diff_line_prefix(options),
4590 options->line_termination);
4591 if (options->stat_sep) {
4592 /* attach patch instead of inline */
4593 fputs(options->stat_sep, options->file);
4594 }
4595 }
4596
4597 for (i = 0; i < q->nr; i++) {
4598 struct diff_filepair *p = q->queue[i];
4599 if (check_pair_status(p))
4600 diff_flush_patch(p, options);
4601 }
4602 }
4603
4604 if (output_format & DIFF_FORMAT_CALLBACK)
4605 options->format_callback(q, options, options->format_callback_data);
4606
4607 for (i = 0; i < q->nr; i++)
4608 diff_free_filepair(q->queue[i]);
4609 free_queue:
4610 free(q->queue);
4611 DIFF_QUEUE_CLEAR(q);
4612 if (options->close_file)
4613 fclose(options->file);
4614
4615 /*
4616 * Report the content-level differences with HAS_CHANGES;
4617 * diff_addremove/diff_change does not set the bit when
4618 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4619 */
4620 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4621 if (options->found_changes)
4622 DIFF_OPT_SET(options, HAS_CHANGES);
4623 else
4624 DIFF_OPT_CLR(options, HAS_CHANGES);
4625 }
4626 }
4627
4628 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4629 {
4630 return (((p->status == DIFF_STATUS_MODIFIED) &&
4631 ((p->score &&
4632 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4633 (!p->score &&
4634 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4635 ((p->status != DIFF_STATUS_MODIFIED) &&
4636 filter_bit_tst(p->status, options)));
4637 }
4638
4639 static void diffcore_apply_filter(struct diff_options *options)
4640 {
4641 int i;
4642 struct diff_queue_struct *q = &diff_queued_diff;
4643 struct diff_queue_struct outq;
4644
4645 DIFF_QUEUE_CLEAR(&outq);
4646
4647 if (!options->filter)
4648 return;
4649
4650 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4651 int found;
4652 for (i = found = 0; !found && i < q->nr; i++) {
4653 if (match_filter(options, q->queue[i]))
4654 found++;
4655 }
4656 if (found)
4657 return;
4658
4659 /* otherwise we will clear the whole queue
4660 * by copying the empty outq at the end of this
4661 * function, but first clear the current entries
4662 * in the queue.
4663 */
4664 for (i = 0; i < q->nr; i++)
4665 diff_free_filepair(q->queue[i]);
4666 }
4667 else {
4668 /* Only the matching ones */
4669 for (i = 0; i < q->nr; i++) {
4670 struct diff_filepair *p = q->queue[i];
4671 if (match_filter(options, p))
4672 diff_q(&outq, p);
4673 else
4674 diff_free_filepair(p);
4675 }
4676 }
4677 free(q->queue);
4678 *q = outq;
4679 }
4680
4681 /* Check whether two filespecs with the same mode and size are identical */
4682 static int diff_filespec_is_identical(struct diff_filespec *one,
4683 struct diff_filespec *two)
4684 {
4685 if (S_ISGITLINK(one->mode))
4686 return 0;
4687 if (diff_populate_filespec(one, 0))
4688 return 0;
4689 if (diff_populate_filespec(two, 0))
4690 return 0;
4691 return !memcmp(one->data, two->data, one->size);
4692 }
4693
4694 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4695 {
4696 if (p->done_skip_stat_unmatch)
4697 return p->skip_stat_unmatch_result;
4698
4699 p->done_skip_stat_unmatch = 1;
4700 p->skip_stat_unmatch_result = 0;
4701 /*
4702 * 1. Entries that come from stat info dirtiness
4703 * always have both sides (iow, not create/delete),
4704 * one side of the object name is unknown, with
4705 * the same mode and size. Keep the ones that
4706 * do not match these criteria. They have real
4707 * differences.
4708 *
4709 * 2. At this point, the file is known to be modified,
4710 * with the same mode and size, and the object
4711 * name of one side is unknown. Need to inspect
4712 * the identical contents.
4713 */
4714 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4715 !DIFF_FILE_VALID(p->two) ||
4716 (p->one->sha1_valid && p->two->sha1_valid) ||
4717 (p->one->mode != p->two->mode) ||
4718 diff_populate_filespec(p->one, 1) ||
4719 diff_populate_filespec(p->two, 1) ||
4720 (p->one->size != p->two->size) ||
4721 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4722 p->skip_stat_unmatch_result = 1;
4723 return p->skip_stat_unmatch_result;
4724 }
4725
4726 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4727 {
4728 int i;
4729 struct diff_queue_struct *q = &diff_queued_diff;
4730 struct diff_queue_struct outq;
4731 DIFF_QUEUE_CLEAR(&outq);
4732
4733 for (i = 0; i < q->nr; i++) {
4734 struct diff_filepair *p = q->queue[i];
4735
4736 if (diff_filespec_check_stat_unmatch(p))
4737 diff_q(&outq, p);
4738 else {
4739 /*
4740 * The caller can subtract 1 from skip_stat_unmatch
4741 * to determine how many paths were dirty only
4742 * due to stat info mismatch.
4743 */
4744 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4745 diffopt->skip_stat_unmatch++;
4746 diff_free_filepair(p);
4747 }
4748 }
4749 free(q->queue);
4750 *q = outq;
4751 }
4752
4753 static int diffnamecmp(const void *a_, const void *b_)
4754 {
4755 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4756 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4757 const char *name_a, *name_b;
4758
4759 name_a = a->one ? a->one->path : a->two->path;
4760 name_b = b->one ? b->one->path : b->two->path;
4761 return strcmp(name_a, name_b);
4762 }
4763
4764 void diffcore_fix_diff_index(struct diff_options *options)
4765 {
4766 struct diff_queue_struct *q = &diff_queued_diff;
4767 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4768 }
4769
4770 void diffcore_std(struct diff_options *options)
4771 {
4772 if (options->skip_stat_unmatch)
4773 diffcore_skip_stat_unmatch(options);
4774 if (!options->found_follow) {
4775 /* See try_to_follow_renames() in tree-diff.c */
4776 if (options->break_opt != -1)
4777 diffcore_break(options->break_opt);
4778 if (options->detect_rename)
4779 diffcore_rename(options);
4780 if (options->break_opt != -1)
4781 diffcore_merge_broken();
4782 }
4783 if (options->pickaxe)
4784 diffcore_pickaxe(options);
4785 if (options->orderfile)
4786 diffcore_order(options->orderfile);
4787 if (!options->found_follow)
4788 /* See try_to_follow_renames() in tree-diff.c */
4789 diff_resolve_rename_copy();
4790 diffcore_apply_filter(options);
4791
4792 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4793 DIFF_OPT_SET(options, HAS_CHANGES);
4794 else
4795 DIFF_OPT_CLR(options, HAS_CHANGES);
4796
4797 options->found_follow = 0;
4798 }
4799
4800 int diff_result_code(struct diff_options *opt, int status)
4801 {
4802 int result = 0;
4803
4804 diff_warn_rename_limit("diff.renameLimit",
4805 opt->needed_rename_limit,
4806 opt->degraded_cc_to_c);
4807 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4808 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4809 return status;
4810 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4811 DIFF_OPT_TST(opt, HAS_CHANGES))
4812 result |= 01;
4813 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4814 DIFF_OPT_TST(opt, CHECK_FAILED))
4815 result |= 02;
4816 return result;
4817 }
4818
4819 int diff_can_quit_early(struct diff_options *opt)
4820 {
4821 return (DIFF_OPT_TST(opt, QUICK) &&
4822 !opt->filter &&
4823 DIFF_OPT_TST(opt, HAS_CHANGES));
4824 }
4825
4826 /*
4827 * Shall changes to this submodule be ignored?
4828 *
4829 * Submodule changes can be configured to be ignored separately for each path,
4830 * but that configuration can be overridden from the command line.
4831 */
4832 static int is_submodule_ignored(const char *path, struct diff_options *options)
4833 {
4834 int ignored = 0;
4835 unsigned orig_flags = options->flags;
4836 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4837 set_diffopt_flags_from_submodule_config(options, path);
4838 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4839 ignored = 1;
4840 options->flags = orig_flags;
4841 return ignored;
4842 }
4843
4844 void diff_addremove(struct diff_options *options,
4845 int addremove, unsigned mode,
4846 const unsigned char *sha1,
4847 int sha1_valid,
4848 const char *concatpath, unsigned dirty_submodule)
4849 {
4850 struct diff_filespec *one, *two;
4851
4852 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4853 return;
4854
4855 /* This may look odd, but it is a preparation for
4856 * feeding "there are unchanged files which should
4857 * not produce diffs, but when you are doing copy
4858 * detection you would need them, so here they are"
4859 * entries to the diff-core. They will be prefixed
4860 * with something like '=' or '*' (I haven't decided
4861 * which but should not make any difference).
4862 * Feeding the same new and old to diff_change()
4863 * also has the same effect.
4864 * Before the final output happens, they are pruned after
4865 * merged into rename/copy pairs as appropriate.
4866 */
4867 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4868 addremove = (addremove == '+' ? '-' :
4869 addremove == '-' ? '+' : addremove);
4870
4871 if (options->prefix &&
4872 strncmp(concatpath, options->prefix, options->prefix_length))
4873 return;
4874
4875 one = alloc_filespec(concatpath);
4876 two = alloc_filespec(concatpath);
4877
4878 if (addremove != '+')
4879 fill_filespec(one, sha1, sha1_valid, mode);
4880 if (addremove != '-') {
4881 fill_filespec(two, sha1, sha1_valid, mode);
4882 two->dirty_submodule = dirty_submodule;
4883 }
4884
4885 diff_queue(&diff_queued_diff, one, two);
4886 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4887 DIFF_OPT_SET(options, HAS_CHANGES);
4888 }
4889
4890 void diff_change(struct diff_options *options,
4891 unsigned old_mode, unsigned new_mode,
4892 const unsigned char *old_sha1,
4893 const unsigned char *new_sha1,
4894 int old_sha1_valid, int new_sha1_valid,
4895 const char *concatpath,
4896 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4897 {
4898 struct diff_filespec *one, *two;
4899 struct diff_filepair *p;
4900
4901 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4902 is_submodule_ignored(concatpath, options))
4903 return;
4904
4905 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4906 unsigned tmp;
4907 const unsigned char *tmp_c;
4908 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4909 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4910 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4911 new_sha1_valid = tmp;
4912 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4913 new_dirty_submodule = tmp;
4914 }
4915
4916 if (options->prefix &&
4917 strncmp(concatpath, options->prefix, options->prefix_length))
4918 return;
4919
4920 one = alloc_filespec(concatpath);
4921 two = alloc_filespec(concatpath);
4922 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4923 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4924 one->dirty_submodule = old_dirty_submodule;
4925 two->dirty_submodule = new_dirty_submodule;
4926 p = diff_queue(&diff_queued_diff, one, two);
4927
4928 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4929 return;
4930
4931 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
4932 !diff_filespec_check_stat_unmatch(p))
4933 return;
4934
4935 DIFF_OPT_SET(options, HAS_CHANGES);
4936 }
4937
4938 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4939 {
4940 struct diff_filepair *pair;
4941 struct diff_filespec *one, *two;
4942
4943 if (options->prefix &&
4944 strncmp(path, options->prefix, options->prefix_length))
4945 return NULL;
4946
4947 one = alloc_filespec(path);
4948 two = alloc_filespec(path);
4949 pair = diff_queue(&diff_queued_diff, one, two);
4950 pair->is_unmerged = 1;
4951 return pair;
4952 }
4953
4954 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4955 size_t *outsize)
4956 {
4957 struct diff_tempfile *temp;
4958 const char *argv[3];
4959 const char **arg = argv;
4960 struct child_process child;
4961 struct strbuf buf = STRBUF_INIT;
4962 int err = 0;
4963
4964 temp = prepare_temp_file(spec->path, spec);
4965 *arg++ = pgm;
4966 *arg++ = temp->name;
4967 *arg = NULL;
4968
4969 memset(&child, 0, sizeof(child));
4970 child.use_shell = 1;
4971 child.argv = argv;
4972 child.out = -1;
4973 if (start_command(&child)) {
4974 remove_tempfile();
4975 return NULL;
4976 }
4977
4978 if (strbuf_read(&buf, child.out, 0) < 0)
4979 err = error("error reading from textconv command '%s'", pgm);
4980 close(child.out);
4981
4982 if (finish_command(&child) || err) {
4983 strbuf_release(&buf);
4984 remove_tempfile();
4985 return NULL;
4986 }
4987 remove_tempfile();
4988
4989 return strbuf_detach(&buf, outsize);
4990 }
4991
4992 size_t fill_textconv(struct userdiff_driver *driver,
4993 struct diff_filespec *df,
4994 char **outbuf)
4995 {
4996 size_t size;
4997
4998 if (!driver || !driver->textconv) {
4999 if (!DIFF_FILE_VALID(df)) {
5000 *outbuf = "";
5001 return 0;
5002 }
5003 if (diff_populate_filespec(df, 0))
5004 die("unable to read files to diff");
5005 *outbuf = df->data;
5006 return df->size;
5007 }
5008
5009 if (driver->textconv_cache && df->sha1_valid) {
5010 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
5011 &size);
5012 if (*outbuf)
5013 return size;
5014 }
5015
5016 *outbuf = run_textconv(driver->textconv, df, &size);
5017 if (!*outbuf)
5018 die("unable to read files to diff");
5019
5020 if (driver->textconv_cache && df->sha1_valid) {
5021 /* ignore errors, as we might be in a readonly repository */
5022 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
5023 size);
5024 /*
5025 * we could save up changes and flush them all at the end,
5026 * but we would need an extra call after all diffing is done.
5027 * Since generating a cache entry is the slow path anyway,
5028 * this extra overhead probably isn't a big deal.
5029 */
5030 notes_cache_write(driver->textconv_cache);
5031 }
5032
5033 return size;
5034 }
5035
5036 void setup_diff_pager(struct diff_options *opt)
5037 {
5038 /*
5039 * If the user asked for our exit code, then either they want --quiet
5040 * or --exit-code. We should definitely not bother with a pager in the
5041 * former case, as we will generate no output. Since we still properly
5042 * report our exit code even when a pager is run, we _could_ run a
5043 * pager with --exit-code. But since we have not done so historically,
5044 * and because it is easy to find people oneline advising "git diff
5045 * --exit-code" in hooks and other scripts, we do not do so.
5046 */
5047 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5048 check_pager_config("diff") != 0)
5049 setup_pager();
5050 }
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