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diff-highlight: do not split multibyte characters
[alt-git.git] / diff.c
blob4493dde7495c91346d9d164df63fbb61ed1bf00b
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18 #include "string-list.h"
19 #include "argv-array.h"
20
21 #ifdef NO_FAST_WORKING_DIRECTORY
22 #define FAST_WORKING_DIRECTORY 0
23 #else
24 #define FAST_WORKING_DIRECTORY 1
25 #endif
26
27 static int diff_detect_rename_default;
28 static int diff_rename_limit_default = 400;
29 static int diff_suppress_blank_empty;
30 static int diff_use_color_default = -1;
31 static int diff_context_default = 3;
32 static const char *diff_word_regex_cfg;
33 static const char *external_diff_cmd_cfg;
34 static const char *diff_order_file_cfg;
35 int diff_auto_refresh_index = 1;
36 static int diff_mnemonic_prefix;
37 static int diff_no_prefix;
38 static int diff_stat_graph_width;
39 static int diff_dirstat_permille_default = 30;
40 static struct diff_options default_diff_options;
41 static long diff_algorithm;
42
43 static char diff_colors[][COLOR_MAXLEN] = {
44 GIT_COLOR_RESET,
45 GIT_COLOR_NORMAL, /* PLAIN */
46 GIT_COLOR_BOLD, /* METAINFO */
47 GIT_COLOR_CYAN, /* FRAGINFO */
48 GIT_COLOR_RED, /* OLD */
49 GIT_COLOR_GREEN, /* NEW */
50 GIT_COLOR_YELLOW, /* COMMIT */
51 GIT_COLOR_BG_RED, /* WHITESPACE */
52 GIT_COLOR_NORMAL, /* FUNCINFO */
53 };
54
55 static int parse_diff_color_slot(const char *var)
56 {
57 if (!strcasecmp(var, "plain"))
58 return DIFF_PLAIN;
59 if (!strcasecmp(var, "meta"))
60 return DIFF_METAINFO;
61 if (!strcasecmp(var, "frag"))
62 return DIFF_FRAGINFO;
63 if (!strcasecmp(var, "old"))
64 return DIFF_FILE_OLD;
65 if (!strcasecmp(var, "new"))
66 return DIFF_FILE_NEW;
67 if (!strcasecmp(var, "commit"))
68 return DIFF_COMMIT;
69 if (!strcasecmp(var, "whitespace"))
70 return DIFF_WHITESPACE;
71 if (!strcasecmp(var, "func"))
72 return DIFF_FUNCINFO;
73 return -1;
74 }
75
76 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
77 struct strbuf *errmsg)
78 {
79 char *params_copy = xstrdup(params_string);
80 struct string_list params = STRING_LIST_INIT_NODUP;
81 int ret = 0;
82 int i;
83
84 if (*params_copy)
85 string_list_split_in_place(&params, params_copy, ',', -1);
86 for (i = 0; i < params.nr; i++) {
87 const char *p = params.items[i].string;
88 if (!strcmp(p, "changes")) {
89 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
90 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
91 } else if (!strcmp(p, "lines")) {
92 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
93 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
94 } else if (!strcmp(p, "files")) {
95 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
96 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
97 } else if (!strcmp(p, "noncumulative")) {
98 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
99 } else if (!strcmp(p, "cumulative")) {
100 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
101 } else if (isdigit(*p)) {
102 char *end;
103 int permille = strtoul(p, &end, 10) * 10;
104 if (*end == '.' && isdigit(*++end)) {
105 /* only use first digit */
106 permille += *end - '0';
107 /* .. and ignore any further digits */
108 while (isdigit(*++end))
109 ; /* nothing */
110 }
111 if (!*end)
112 options->dirstat_permille = permille;
113 else {
114 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
115 p);
116 ret++;
117 }
118 } else {
119 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
120 ret++;
121 }
122
123 }
124 string_list_clear(&params, 0);
125 free(params_copy);
126 return ret;
127 }
128
129 static int parse_submodule_params(struct diff_options *options, const char *value)
130 {
131 if (!strcmp(value, "log"))
132 DIFF_OPT_SET(options, SUBMODULE_LOG);
133 else if (!strcmp(value, "short"))
134 DIFF_OPT_CLR(options, SUBMODULE_LOG);
135 else
136 return -1;
137 return 0;
138 }
139
140 static int git_config_rename(const char *var, const char *value)
141 {
142 if (!value)
143 return DIFF_DETECT_RENAME;
144 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
145 return DIFF_DETECT_COPY;
146 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
147 }
148
149 long parse_algorithm_value(const char *value)
150 {
151 if (!value)
152 return -1;
153 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
154 return 0;
155 else if (!strcasecmp(value, "minimal"))
156 return XDF_NEED_MINIMAL;
157 else if (!strcasecmp(value, "patience"))
158 return XDF_PATIENCE_DIFF;
159 else if (!strcasecmp(value, "histogram"))
160 return XDF_HISTOGRAM_DIFF;
161 return -1;
162 }
163
164 /*
165 * These are to give UI layer defaults.
166 * The core-level commands such as git-diff-files should
167 * never be affected by the setting of diff.renames
168 * the user happens to have in the configuration file.
169 */
170 int git_diff_ui_config(const char *var, const char *value, void *cb)
171 {
172 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
173 diff_use_color_default = git_config_colorbool(var, value);
174 return 0;
175 }
176 if (!strcmp(var, "diff.context")) {
177 diff_context_default = git_config_int(var, value);
178 if (diff_context_default < 0)
179 return -1;
180 return 0;
181 }
182 if (!strcmp(var, "diff.renames")) {
183 diff_detect_rename_default = git_config_rename(var, value);
184 return 0;
185 }
186 if (!strcmp(var, "diff.autorefreshindex")) {
187 diff_auto_refresh_index = git_config_bool(var, value);
188 return 0;
189 }
190 if (!strcmp(var, "diff.mnemonicprefix")) {
191 diff_mnemonic_prefix = git_config_bool(var, value);
192 return 0;
193 }
194 if (!strcmp(var, "diff.noprefix")) {
195 diff_no_prefix = git_config_bool(var, value);
196 return 0;
197 }
198 if (!strcmp(var, "diff.statgraphwidth")) {
199 diff_stat_graph_width = git_config_int(var, value);
200 return 0;
201 }
202 if (!strcmp(var, "diff.external"))
203 return git_config_string(&external_diff_cmd_cfg, var, value);
204 if (!strcmp(var, "diff.wordregex"))
205 return git_config_string(&diff_word_regex_cfg, var, value);
206 if (!strcmp(var, "diff.orderfile"))
207 return git_config_pathname(&diff_order_file_cfg, var, value);
208
209 if (!strcmp(var, "diff.ignoresubmodules"))
210 handle_ignore_submodules_arg(&default_diff_options, value);
211
212 if (!strcmp(var, "diff.submodule")) {
213 if (parse_submodule_params(&default_diff_options, value))
214 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
215 value);
216 return 0;
217 }
218
219 if (!strcmp(var, "diff.algorithm")) {
220 diff_algorithm = parse_algorithm_value(value);
221 if (diff_algorithm < 0)
222 return -1;
223 return 0;
224 }
225
226 if (git_color_config(var, value, cb) < 0)
227 return -1;
228
229 return git_diff_basic_config(var, value, cb);
230 }
231
232 int git_diff_basic_config(const char *var, const char *value, void *cb)
233 {
234 const char *name;
235
236 if (!strcmp(var, "diff.renamelimit")) {
237 diff_rename_limit_default = git_config_int(var, value);
238 return 0;
239 }
240
241 if (userdiff_config(var, value) < 0)
242 return -1;
243
244 if (skip_prefix(var, "diff.color.", &name) ||
245 skip_prefix(var, "color.diff.", &name)) {
246 int slot = parse_diff_color_slot(name);
247 if (slot < 0)
248 return 0;
249 if (!value)
250 return config_error_nonbool(var);
251 return color_parse(value, diff_colors[slot]);
252 }
253
254 /* like GNU diff's --suppress-blank-empty option */
255 if (!strcmp(var, "diff.suppressblankempty") ||
256 /* for backwards compatibility */
257 !strcmp(var, "diff.suppress-blank-empty")) {
258 diff_suppress_blank_empty = git_config_bool(var, value);
259 return 0;
260 }
261
262 if (!strcmp(var, "diff.dirstat")) {
263 struct strbuf errmsg = STRBUF_INIT;
264 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
265 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
266 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
267 errmsg.buf);
268 strbuf_release(&errmsg);
269 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
270 return 0;
271 }
272
273 if (starts_with(var, "submodule."))
274 return parse_submodule_config_option(var, value);
275
276 return git_default_config(var, value, cb);
277 }
278
279 static char *quote_two(const char *one, const char *two)
280 {
281 int need_one = quote_c_style(one, NULL, NULL, 1);
282 int need_two = quote_c_style(two, NULL, NULL, 1);
283 struct strbuf res = STRBUF_INIT;
284
285 if (need_one + need_two) {
286 strbuf_addch(&res, '"');
287 quote_c_style(one, &res, NULL, 1);
288 quote_c_style(two, &res, NULL, 1);
289 strbuf_addch(&res, '"');
290 } else {
291 strbuf_addstr(&res, one);
292 strbuf_addstr(&res, two);
293 }
294 return strbuf_detach(&res, NULL);
295 }
296
297 static const char *external_diff(void)
298 {
299 static const char *external_diff_cmd = NULL;
300 static int done_preparing = 0;
301
302 if (done_preparing)
303 return external_diff_cmd;
304 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
305 if (!external_diff_cmd)
306 external_diff_cmd = external_diff_cmd_cfg;
307 done_preparing = 1;
308 return external_diff_cmd;
309 }
310
311 static struct diff_tempfile {
312 const char *name; /* filename external diff should read from */
313 char hex[41];
314 char mode[10];
315 char tmp_path[PATH_MAX];
316 } diff_temp[2];
317
318 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
319
320 struct emit_callback {
321 int color_diff;
322 unsigned ws_rule;
323 int blank_at_eof_in_preimage;
324 int blank_at_eof_in_postimage;
325 int lno_in_preimage;
326 int lno_in_postimage;
327 sane_truncate_fn truncate;
328 const char **label_path;
329 struct diff_words_data *diff_words;
330 struct diff_options *opt;
331 int *found_changesp;
332 struct strbuf *header;
333 };
334
335 static int count_lines(const char *data, int size)
336 {
337 int count, ch, completely_empty = 1, nl_just_seen = 0;
338 count = 0;
339 while (0 < size--) {
340 ch = *data++;
341 if (ch == '\n') {
342 count++;
343 nl_just_seen = 1;
344 completely_empty = 0;
345 }
346 else {
347 nl_just_seen = 0;
348 completely_empty = 0;
349 }
350 }
351 if (completely_empty)
352 return 0;
353 if (!nl_just_seen)
354 count++; /* no trailing newline */
355 return count;
356 }
357
358 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
359 {
360 if (!DIFF_FILE_VALID(one)) {
361 mf->ptr = (char *)""; /* does not matter */
362 mf->size = 0;
363 return 0;
364 }
365 else if (diff_populate_filespec(one, 0))
366 return -1;
367
368 mf->ptr = one->data;
369 mf->size = one->size;
370 return 0;
371 }
372
373 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
374 static unsigned long diff_filespec_size(struct diff_filespec *one)
375 {
376 if (!DIFF_FILE_VALID(one))
377 return 0;
378 diff_populate_filespec(one, 1);
379 return one->size;
380 }
381
382 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
383 {
384 char *ptr = mf->ptr;
385 long size = mf->size;
386 int cnt = 0;
387
388 if (!size)
389 return cnt;
390 ptr += size - 1; /* pointing at the very end */
391 if (*ptr != '\n')
392 ; /* incomplete line */
393 else
394 ptr--; /* skip the last LF */
395 while (mf->ptr < ptr) {
396 char *prev_eol;
397 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
398 if (*prev_eol == '\n')
399 break;
400 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
401 break;
402 cnt++;
403 ptr = prev_eol - 1;
404 }
405 return cnt;
406 }
407
408 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
409 struct emit_callback *ecbdata)
410 {
411 int l1, l2, at;
412 unsigned ws_rule = ecbdata->ws_rule;
413 l1 = count_trailing_blank(mf1, ws_rule);
414 l2 = count_trailing_blank(mf2, ws_rule);
415 if (l2 <= l1) {
416 ecbdata->blank_at_eof_in_preimage = 0;
417 ecbdata->blank_at_eof_in_postimage = 0;
418 return;
419 }
420 at = count_lines(mf1->ptr, mf1->size);
421 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
422
423 at = count_lines(mf2->ptr, mf2->size);
424 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
425 }
426
427 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
428 int first, const char *line, int len)
429 {
430 int has_trailing_newline, has_trailing_carriage_return;
431 int nofirst;
432 FILE *file = o->file;
433
434 fputs(diff_line_prefix(o), file);
435
436 if (len == 0) {
437 has_trailing_newline = (first == '\n');
438 has_trailing_carriage_return = (!has_trailing_newline &&
439 (first == '\r'));
440 nofirst = has_trailing_newline || has_trailing_carriage_return;
441 } else {
442 has_trailing_newline = (len > 0 && line[len-1] == '\n');
443 if (has_trailing_newline)
444 len--;
445 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
446 if (has_trailing_carriage_return)
447 len--;
448 nofirst = 0;
449 }
450
451 if (len || !nofirst) {
452 fputs(set, file);
453 if (!nofirst)
454 fputc(first, file);
455 fwrite(line, len, 1, file);
456 fputs(reset, file);
457 }
458 if (has_trailing_carriage_return)
459 fputc('\r', file);
460 if (has_trailing_newline)
461 fputc('\n', file);
462 }
463
464 static void emit_line(struct diff_options *o, const char *set, const char *reset,
465 const char *line, int len)
466 {
467 emit_line_0(o, set, reset, line[0], line+1, len-1);
468 }
469
470 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
471 {
472 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
473 ecbdata->blank_at_eof_in_preimage &&
474 ecbdata->blank_at_eof_in_postimage &&
475 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
476 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
477 return 0;
478 return ws_blank_line(line, len, ecbdata->ws_rule);
479 }
480
481 static void emit_add_line(const char *reset,
482 struct emit_callback *ecbdata,
483 const char *line, int len)
484 {
485 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
486 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
487
488 if (!*ws)
489 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
490 else if (new_blank_line_at_eof(ecbdata, line, len))
491 /* Blank line at EOF - paint '+' as well */
492 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
493 else {
494 /* Emit just the prefix, then the rest. */
495 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
496 ws_check_emit(line, len, ecbdata->ws_rule,
497 ecbdata->opt->file, set, reset, ws);
498 }
499 }
500
501 static void emit_hunk_header(struct emit_callback *ecbdata,
502 const char *line, int len)
503 {
504 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
505 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
506 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
507 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
508 static const char atat[2] = { '@', '@' };
509 const char *cp, *ep;
510 struct strbuf msgbuf = STRBUF_INIT;
511 int org_len = len;
512 int i = 1;
513
514 /*
515 * As a hunk header must begin with "@@ -<old>, +<new> @@",
516 * it always is at least 10 bytes long.
517 */
518 if (len < 10 ||
519 memcmp(line, atat, 2) ||
520 !(ep = memmem(line + 2, len - 2, atat, 2))) {
521 emit_line(ecbdata->opt, plain, reset, line, len);
522 return;
523 }
524 ep += 2; /* skip over @@ */
525
526 /* The hunk header in fraginfo color */
527 strbuf_addstr(&msgbuf, frag);
528 strbuf_add(&msgbuf, line, ep - line);
529 strbuf_addstr(&msgbuf, reset);
530
531 /*
532 * trailing "\r\n"
533 */
534 for ( ; i < 3; i++)
535 if (line[len - i] == '\r' || line[len - i] == '\n')
536 len--;
537
538 /* blank before the func header */
539 for (cp = ep; ep - line < len; ep++)
540 if (*ep != ' ' && *ep != '\t')
541 break;
542 if (ep != cp) {
543 strbuf_addstr(&msgbuf, plain);
544 strbuf_add(&msgbuf, cp, ep - cp);
545 strbuf_addstr(&msgbuf, reset);
546 }
547
548 if (ep < line + len) {
549 strbuf_addstr(&msgbuf, func);
550 strbuf_add(&msgbuf, ep, line + len - ep);
551 strbuf_addstr(&msgbuf, reset);
552 }
553
554 strbuf_add(&msgbuf, line + len, org_len - len);
555 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
556 strbuf_release(&msgbuf);
557 }
558
559 static struct diff_tempfile *claim_diff_tempfile(void) {
560 int i;
561 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
562 if (!diff_temp[i].name)
563 return diff_temp + i;
564 die("BUG: diff is failing to clean up its tempfiles");
565 }
566
567 static int remove_tempfile_installed;
568
569 static void remove_tempfile(void)
570 {
571 int i;
572 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
573 if (diff_temp[i].name == diff_temp[i].tmp_path)
574 unlink_or_warn(diff_temp[i].name);
575 diff_temp[i].name = NULL;
576 }
577 }
578
579 static void remove_tempfile_on_signal(int signo)
580 {
581 remove_tempfile();
582 sigchain_pop(signo);
583 raise(signo);
584 }
585
586 static void print_line_count(FILE *file, int count)
587 {
588 switch (count) {
589 case 0:
590 fprintf(file, "0,0");
591 break;
592 case 1:
593 fprintf(file, "1");
594 break;
595 default:
596 fprintf(file, "1,%d", count);
597 break;
598 }
599 }
600
601 static void emit_rewrite_lines(struct emit_callback *ecb,
602 int prefix, const char *data, int size)
603 {
604 const char *endp = NULL;
605 static const char *nneof = " No newline at end of file\n";
606 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
607 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
608
609 while (0 < size) {
610 int len;
611
612 endp = memchr(data, '\n', size);
613 len = endp ? (endp - data + 1) : size;
614 if (prefix != '+') {
615 ecb->lno_in_preimage++;
616 emit_line_0(ecb->opt, old, reset, '-',
617 data, len);
618 } else {
619 ecb->lno_in_postimage++;
620 emit_add_line(reset, ecb, data, len);
621 }
622 size -= len;
623 data += len;
624 }
625 if (!endp) {
626 const char *plain = diff_get_color(ecb->color_diff,
627 DIFF_PLAIN);
628 putc('\n', ecb->opt->file);
629 emit_line_0(ecb->opt, plain, reset, '\\',
630 nneof, strlen(nneof));
631 }
632 }
633
634 static void emit_rewrite_diff(const char *name_a,
635 const char *name_b,
636 struct diff_filespec *one,
637 struct diff_filespec *two,
638 struct userdiff_driver *textconv_one,
639 struct userdiff_driver *textconv_two,
640 struct diff_options *o)
641 {
642 int lc_a, lc_b;
643 const char *name_a_tab, *name_b_tab;
644 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
645 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
646 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
647 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
648 const char *a_prefix, *b_prefix;
649 char *data_one, *data_two;
650 size_t size_one, size_two;
651 struct emit_callback ecbdata;
652 const char *line_prefix = diff_line_prefix(o);
653
654 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
655 a_prefix = o->b_prefix;
656 b_prefix = o->a_prefix;
657 } else {
658 a_prefix = o->a_prefix;
659 b_prefix = o->b_prefix;
660 }
661
662 name_a += (*name_a == '/');
663 name_b += (*name_b == '/');
664 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
665 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
666
667 strbuf_reset(&a_name);
668 strbuf_reset(&b_name);
669 quote_two_c_style(&a_name, a_prefix, name_a, 0);
670 quote_two_c_style(&b_name, b_prefix, name_b, 0);
671
672 size_one = fill_textconv(textconv_one, one, &data_one);
673 size_two = fill_textconv(textconv_two, two, &data_two);
674
675 memset(&ecbdata, 0, sizeof(ecbdata));
676 ecbdata.color_diff = want_color(o->use_color);
677 ecbdata.found_changesp = &o->found_changes;
678 ecbdata.ws_rule = whitespace_rule(name_b);
679 ecbdata.opt = o;
680 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
681 mmfile_t mf1, mf2;
682 mf1.ptr = (char *)data_one;
683 mf2.ptr = (char *)data_two;
684 mf1.size = size_one;
685 mf2.size = size_two;
686 check_blank_at_eof(&mf1, &mf2, &ecbdata);
687 }
688 ecbdata.lno_in_preimage = 1;
689 ecbdata.lno_in_postimage = 1;
690
691 lc_a = count_lines(data_one, size_one);
692 lc_b = count_lines(data_two, size_two);
693 fprintf(o->file,
694 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
695 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
696 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
697 line_prefix, fraginfo);
698 if (!o->irreversible_delete)
699 print_line_count(o->file, lc_a);
700 else
701 fprintf(o->file, "?,?");
702 fprintf(o->file, " +");
703 print_line_count(o->file, lc_b);
704 fprintf(o->file, " @@%s\n", reset);
705 if (lc_a && !o->irreversible_delete)
706 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
707 if (lc_b)
708 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
709 if (textconv_one)
710 free((char *)data_one);
711 if (textconv_two)
712 free((char *)data_two);
713 }
714
715 struct diff_words_buffer {
716 mmfile_t text;
717 long alloc;
718 struct diff_words_orig {
719 const char *begin, *end;
720 } *orig;
721 int orig_nr, orig_alloc;
722 };
723
724 static void diff_words_append(char *line, unsigned long len,
725 struct diff_words_buffer *buffer)
726 {
727 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
728 line++;
729 len--;
730 memcpy(buffer->text.ptr + buffer->text.size, line, len);
731 buffer->text.size += len;
732 buffer->text.ptr[buffer->text.size] = '\0';
733 }
734
735 struct diff_words_style_elem {
736 const char *prefix;
737 const char *suffix;
738 const char *color; /* NULL; filled in by the setup code if
739 * color is enabled */
740 };
741
742 struct diff_words_style {
743 enum diff_words_type type;
744 struct diff_words_style_elem new, old, ctx;
745 const char *newline;
746 };
747
748 static struct diff_words_style diff_words_styles[] = {
749 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
750 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
751 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
752 };
753
754 struct diff_words_data {
755 struct diff_words_buffer minus, plus;
756 const char *current_plus;
757 int last_minus;
758 struct diff_options *opt;
759 regex_t *word_regex;
760 enum diff_words_type type;
761 struct diff_words_style *style;
762 };
763
764 static int fn_out_diff_words_write_helper(FILE *fp,
765 struct diff_words_style_elem *st_el,
766 const char *newline,
767 size_t count, const char *buf,
768 const char *line_prefix)
769 {
770 int print = 0;
771
772 while (count) {
773 char *p = memchr(buf, '\n', count);
774 if (print)
775 fputs(line_prefix, fp);
776 if (p != buf) {
777 if (st_el->color && fputs(st_el->color, fp) < 0)
778 return -1;
779 if (fputs(st_el->prefix, fp) < 0 ||
780 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
781 fputs(st_el->suffix, fp) < 0)
782 return -1;
783 if (st_el->color && *st_el->color
784 && fputs(GIT_COLOR_RESET, fp) < 0)
785 return -1;
786 }
787 if (!p)
788 return 0;
789 if (fputs(newline, fp) < 0)
790 return -1;
791 count -= p + 1 - buf;
792 buf = p + 1;
793 print = 1;
794 }
795 return 0;
796 }
797
798 /*
799 * '--color-words' algorithm can be described as:
800 *
801 * 1. collect a the minus/plus lines of a diff hunk, divided into
802 * minus-lines and plus-lines;
803 *
804 * 2. break both minus-lines and plus-lines into words and
805 * place them into two mmfile_t with one word for each line;
806 *
807 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
808 *
809 * And for the common parts of the both file, we output the plus side text.
810 * diff_words->current_plus is used to trace the current position of the plus file
811 * which printed. diff_words->last_minus is used to trace the last minus word
812 * printed.
813 *
814 * For '--graph' to work with '--color-words', we need to output the graph prefix
815 * on each line of color words output. Generally, there are two conditions on
816 * which we should output the prefix.
817 *
818 * 1. diff_words->last_minus == 0 &&
819 * diff_words->current_plus == diff_words->plus.text.ptr
820 *
821 * that is: the plus text must start as a new line, and if there is no minus
822 * word printed, a graph prefix must be printed.
823 *
824 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
825 * *(diff_words->current_plus - 1) == '\n'
826 *
827 * that is: a graph prefix must be printed following a '\n'
828 */
829 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
830 {
831 if ((diff_words->last_minus == 0 &&
832 diff_words->current_plus == diff_words->plus.text.ptr) ||
833 (diff_words->current_plus > diff_words->plus.text.ptr &&
834 *(diff_words->current_plus - 1) == '\n')) {
835 return 1;
836 } else {
837 return 0;
838 }
839 }
840
841 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
842 {
843 struct diff_words_data *diff_words = priv;
844 struct diff_words_style *style = diff_words->style;
845 int minus_first, minus_len, plus_first, plus_len;
846 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
847 struct diff_options *opt = diff_words->opt;
848 const char *line_prefix;
849
850 if (line[0] != '@' || parse_hunk_header(line, len,
851 &minus_first, &minus_len, &plus_first, &plus_len))
852 return;
853
854 assert(opt);
855 line_prefix = diff_line_prefix(opt);
856
857 /* POSIX requires that first be decremented by one if len == 0... */
858 if (minus_len) {
859 minus_begin = diff_words->minus.orig[minus_first].begin;
860 minus_end =
861 diff_words->minus.orig[minus_first + minus_len - 1].end;
862 } else
863 minus_begin = minus_end =
864 diff_words->minus.orig[minus_first].end;
865
866 if (plus_len) {
867 plus_begin = diff_words->plus.orig[plus_first].begin;
868 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
869 } else
870 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
871
872 if (color_words_output_graph_prefix(diff_words)) {
873 fputs(line_prefix, diff_words->opt->file);
874 }
875 if (diff_words->current_plus != plus_begin) {
876 fn_out_diff_words_write_helper(diff_words->opt->file,
877 &style->ctx, style->newline,
878 plus_begin - diff_words->current_plus,
879 diff_words->current_plus, line_prefix);
880 if (*(plus_begin - 1) == '\n')
881 fputs(line_prefix, diff_words->opt->file);
882 }
883 if (minus_begin != minus_end) {
884 fn_out_diff_words_write_helper(diff_words->opt->file,
885 &style->old, style->newline,
886 minus_end - minus_begin, minus_begin,
887 line_prefix);
888 }
889 if (plus_begin != plus_end) {
890 fn_out_diff_words_write_helper(diff_words->opt->file,
891 &style->new, style->newline,
892 plus_end - plus_begin, plus_begin,
893 line_prefix);
894 }
895
896 diff_words->current_plus = plus_end;
897 diff_words->last_minus = minus_first;
898 }
899
900 /* This function starts looking at *begin, and returns 0 iff a word was found. */
901 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
902 int *begin, int *end)
903 {
904 if (word_regex && *begin < buffer->size) {
905 regmatch_t match[1];
906 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
907 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
908 '\n', match[0].rm_eo - match[0].rm_so);
909 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
910 *begin += match[0].rm_so;
911 return *begin >= *end;
912 }
913 return -1;
914 }
915
916 /* find the next word */
917 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
918 (*begin)++;
919 if (*begin >= buffer->size)
920 return -1;
921
922 /* find the end of the word */
923 *end = *begin + 1;
924 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
925 (*end)++;
926
927 return 0;
928 }
929
930 /*
931 * This function splits the words in buffer->text, stores the list with
932 * newline separator into out, and saves the offsets of the original words
933 * in buffer->orig.
934 */
935 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
936 regex_t *word_regex)
937 {
938 int i, j;
939 long alloc = 0;
940
941 out->size = 0;
942 out->ptr = NULL;
943
944 /* fake an empty "0th" word */
945 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
946 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
947 buffer->orig_nr = 1;
948
949 for (i = 0; i < buffer->text.size; i++) {
950 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
951 return;
952
953 /* store original boundaries */
954 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
955 buffer->orig_alloc);
956 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
957 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
958 buffer->orig_nr++;
959
960 /* store one word */
961 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
962 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
963 out->ptr[out->size + j - i] = '\n';
964 out->size += j - i + 1;
965
966 i = j - 1;
967 }
968 }
969
970 /* this executes the word diff on the accumulated buffers */
971 static void diff_words_show(struct diff_words_data *diff_words)
972 {
973 xpparam_t xpp;
974 xdemitconf_t xecfg;
975 mmfile_t minus, plus;
976 struct diff_words_style *style = diff_words->style;
977
978 struct diff_options *opt = diff_words->opt;
979 const char *line_prefix;
980
981 assert(opt);
982 line_prefix = diff_line_prefix(opt);
983
984 /* special case: only removal */
985 if (!diff_words->plus.text.size) {
986 fputs(line_prefix, diff_words->opt->file);
987 fn_out_diff_words_write_helper(diff_words->opt->file,
988 &style->old, style->newline,
989 diff_words->minus.text.size,
990 diff_words->minus.text.ptr, line_prefix);
991 diff_words->minus.text.size = 0;
992 return;
993 }
994
995 diff_words->current_plus = diff_words->plus.text.ptr;
996 diff_words->last_minus = 0;
997
998 memset(&xpp, 0, sizeof(xpp));
999 memset(&xecfg, 0, sizeof(xecfg));
1000 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
1001 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1002 xpp.flags = 0;
1003 /* as only the hunk header will be parsed, we need a 0-context */
1004 xecfg.ctxlen = 0;
1005 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1006 &xpp, &xecfg);
1007 free(minus.ptr);
1008 free(plus.ptr);
1009 if (diff_words->current_plus != diff_words->plus.text.ptr +
1010 diff_words->plus.text.size) {
1011 if (color_words_output_graph_prefix(diff_words))
1012 fputs(line_prefix, diff_words->opt->file);
1013 fn_out_diff_words_write_helper(diff_words->opt->file,
1014 &style->ctx, style->newline,
1015 diff_words->plus.text.ptr + diff_words->plus.text.size
1016 - diff_words->current_plus, diff_words->current_plus,
1017 line_prefix);
1018 }
1019 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1020 }
1021
1022 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1023 static void diff_words_flush(struct emit_callback *ecbdata)
1024 {
1025 if (ecbdata->diff_words->minus.text.size ||
1026 ecbdata->diff_words->plus.text.size)
1027 diff_words_show(ecbdata->diff_words);
1028 }
1029
1030 static void diff_filespec_load_driver(struct diff_filespec *one)
1031 {
1032 /* Use already-loaded driver */
1033 if (one->driver)
1034 return;
1035
1036 if (S_ISREG(one->mode))
1037 one->driver = userdiff_find_by_path(one->path);
1038
1039 /* Fallback to default settings */
1040 if (!one->driver)
1041 one->driver = userdiff_find_by_name("default");
1042 }
1043
1044 static const char *userdiff_word_regex(struct diff_filespec *one)
1045 {
1046 diff_filespec_load_driver(one);
1047 return one->driver->word_regex;
1048 }
1049
1050 static void init_diff_words_data(struct emit_callback *ecbdata,
1051 struct diff_options *orig_opts,
1052 struct diff_filespec *one,
1053 struct diff_filespec *two)
1054 {
1055 int i;
1056 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1057 memcpy(o, orig_opts, sizeof(struct diff_options));
1058
1059 ecbdata->diff_words =
1060 xcalloc(1, sizeof(struct diff_words_data));
1061 ecbdata->diff_words->type = o->word_diff;
1062 ecbdata->diff_words->opt = o;
1063 if (!o->word_regex)
1064 o->word_regex = userdiff_word_regex(one);
1065 if (!o->word_regex)
1066 o->word_regex = userdiff_word_regex(two);
1067 if (!o->word_regex)
1068 o->word_regex = diff_word_regex_cfg;
1069 if (o->word_regex) {
1070 ecbdata->diff_words->word_regex = (regex_t *)
1071 xmalloc(sizeof(regex_t));
1072 if (regcomp(ecbdata->diff_words->word_regex,
1073 o->word_regex,
1074 REG_EXTENDED | REG_NEWLINE))
1075 die ("Invalid regular expression: %s",
1076 o->word_regex);
1077 }
1078 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1079 if (o->word_diff == diff_words_styles[i].type) {
1080 ecbdata->diff_words->style =
1081 &diff_words_styles[i];
1082 break;
1083 }
1084 }
1085 if (want_color(o->use_color)) {
1086 struct diff_words_style *st = ecbdata->diff_words->style;
1087 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1088 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1089 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1090 }
1091 }
1092
1093 static void free_diff_words_data(struct emit_callback *ecbdata)
1094 {
1095 if (ecbdata->diff_words) {
1096 diff_words_flush(ecbdata);
1097 free (ecbdata->diff_words->opt);
1098 free (ecbdata->diff_words->minus.text.ptr);
1099 free (ecbdata->diff_words->minus.orig);
1100 free (ecbdata->diff_words->plus.text.ptr);
1101 free (ecbdata->diff_words->plus.orig);
1102 if (ecbdata->diff_words->word_regex) {
1103 regfree(ecbdata->diff_words->word_regex);
1104 free(ecbdata->diff_words->word_regex);
1105 }
1106 free(ecbdata->diff_words);
1107 ecbdata->diff_words = NULL;
1108 }
1109 }
1110
1111 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1112 {
1113 if (want_color(diff_use_color))
1114 return diff_colors[ix];
1115 return "";
1116 }
1117
1118 const char *diff_line_prefix(struct diff_options *opt)
1119 {
1120 struct strbuf *msgbuf;
1121 if (!opt->output_prefix)
1122 return "";
1123
1124 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1125 return msgbuf->buf;
1126 }
1127
1128 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1129 {
1130 const char *cp;
1131 unsigned long allot;
1132 size_t l = len;
1133
1134 if (ecb->truncate)
1135 return ecb->truncate(line, len);
1136 cp = line;
1137 allot = l;
1138 while (0 < l) {
1139 (void) utf8_width(&cp, &l);
1140 if (!cp)
1141 break; /* truncated in the middle? */
1142 }
1143 return allot - l;
1144 }
1145
1146 static void find_lno(const char *line, struct emit_callback *ecbdata)
1147 {
1148 const char *p;
1149 ecbdata->lno_in_preimage = 0;
1150 ecbdata->lno_in_postimage = 0;
1151 p = strchr(line, '-');
1152 if (!p)
1153 return; /* cannot happen */
1154 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1155 p = strchr(p, '+');
1156 if (!p)
1157 return; /* cannot happen */
1158 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1159 }
1160
1161 static void fn_out_consume(void *priv, char *line, unsigned long len)
1162 {
1163 struct emit_callback *ecbdata = priv;
1164 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1165 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1166 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1167 struct diff_options *o = ecbdata->opt;
1168 const char *line_prefix = diff_line_prefix(o);
1169
1170 if (ecbdata->header) {
1171 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1172 strbuf_reset(ecbdata->header);
1173 ecbdata->header = NULL;
1174 }
1175 *(ecbdata->found_changesp) = 1;
1176
1177 if (ecbdata->label_path[0]) {
1178 const char *name_a_tab, *name_b_tab;
1179
1180 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1181 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1182
1183 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1184 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1185 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1186 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1187 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1188 }
1189
1190 if (diff_suppress_blank_empty
1191 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1192 line[0] = '\n';
1193 len = 1;
1194 }
1195
1196 if (line[0] == '@') {
1197 if (ecbdata->diff_words)
1198 diff_words_flush(ecbdata);
1199 len = sane_truncate_line(ecbdata, line, len);
1200 find_lno(line, ecbdata);
1201 emit_hunk_header(ecbdata, line, len);
1202 if (line[len-1] != '\n')
1203 putc('\n', ecbdata->opt->file);
1204 return;
1205 }
1206
1207 if (len < 1) {
1208 emit_line(ecbdata->opt, reset, reset, line, len);
1209 if (ecbdata->diff_words
1210 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1211 fputs("~\n", ecbdata->opt->file);
1212 return;
1213 }
1214
1215 if (ecbdata->diff_words) {
1216 if (line[0] == '-') {
1217 diff_words_append(line, len,
1218 &ecbdata->diff_words->minus);
1219 return;
1220 } else if (line[0] == '+') {
1221 diff_words_append(line, len,
1222 &ecbdata->diff_words->plus);
1223 return;
1224 } else if (starts_with(line, "\\ ")) {
1225 /*
1226 * Eat the "no newline at eof" marker as if we
1227 * saw a "+" or "-" line with nothing on it,
1228 * and return without diff_words_flush() to
1229 * defer processing. If this is the end of
1230 * preimage, more "+" lines may come after it.
1231 */
1232 return;
1233 }
1234 diff_words_flush(ecbdata);
1235 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1236 emit_line(ecbdata->opt, plain, reset, line, len);
1237 fputs("~\n", ecbdata->opt->file);
1238 } else {
1239 /*
1240 * Skip the prefix character, if any. With
1241 * diff_suppress_blank_empty, there may be
1242 * none.
1243 */
1244 if (line[0] != '\n') {
1245 line++;
1246 len--;
1247 }
1248 emit_line(ecbdata->opt, plain, reset, line, len);
1249 }
1250 return;
1251 }
1252
1253 if (line[0] != '+') {
1254 const char *color =
1255 diff_get_color(ecbdata->color_diff,
1256 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1257 ecbdata->lno_in_preimage++;
1258 if (line[0] == ' ')
1259 ecbdata->lno_in_postimage++;
1260 emit_line(ecbdata->opt, color, reset, line, len);
1261 } else {
1262 ecbdata->lno_in_postimage++;
1263 emit_add_line(reset, ecbdata, line + 1, len - 1);
1264 }
1265 }
1266
1267 static char *pprint_rename(const char *a, const char *b)
1268 {
1269 const char *old = a;
1270 const char *new = b;
1271 struct strbuf name = STRBUF_INIT;
1272 int pfx_length, sfx_length;
1273 int pfx_adjust_for_slash;
1274 int len_a = strlen(a);
1275 int len_b = strlen(b);
1276 int a_midlen, b_midlen;
1277 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1278 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1279
1280 if (qlen_a || qlen_b) {
1281 quote_c_style(a, &name, NULL, 0);
1282 strbuf_addstr(&name, " => ");
1283 quote_c_style(b, &name, NULL, 0);
1284 return strbuf_detach(&name, NULL);
1285 }
1286
1287 /* Find common prefix */
1288 pfx_length = 0;
1289 while (*old && *new && *old == *new) {
1290 if (*old == '/')
1291 pfx_length = old - a + 1;
1292 old++;
1293 new++;
1294 }
1295
1296 /* Find common suffix */
1297 old = a + len_a;
1298 new = b + len_b;
1299 sfx_length = 0;
1300 /*
1301 * If there is a common prefix, it must end in a slash. In
1302 * that case we let this loop run 1 into the prefix to see the
1303 * same slash.
1304 *
1305 * If there is no common prefix, we cannot do this as it would
1306 * underrun the input strings.
1307 */
1308 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1309 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1310 b + pfx_length - pfx_adjust_for_slash <= new &&
1311 *old == *new) {
1312 if (*old == '/')
1313 sfx_length = len_a - (old - a);
1314 old--;
1315 new--;
1316 }
1317
1318 /*
1319 * pfx{mid-a => mid-b}sfx
1320 * {pfx-a => pfx-b}sfx
1321 * pfx{sfx-a => sfx-b}
1322 * name-a => name-b
1323 */
1324 a_midlen = len_a - pfx_length - sfx_length;
1325 b_midlen = len_b - pfx_length - sfx_length;
1326 if (a_midlen < 0)
1327 a_midlen = 0;
1328 if (b_midlen < 0)
1329 b_midlen = 0;
1330
1331 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1332 if (pfx_length + sfx_length) {
1333 strbuf_add(&name, a, pfx_length);
1334 strbuf_addch(&name, '{');
1335 }
1336 strbuf_add(&name, a + pfx_length, a_midlen);
1337 strbuf_addstr(&name, " => ");
1338 strbuf_add(&name, b + pfx_length, b_midlen);
1339 if (pfx_length + sfx_length) {
1340 strbuf_addch(&name, '}');
1341 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1342 }
1343 return strbuf_detach(&name, NULL);
1344 }
1345
1346 struct diffstat_t {
1347 int nr;
1348 int alloc;
1349 struct diffstat_file {
1350 char *from_name;
1351 char *name;
1352 char *print_name;
1353 unsigned is_unmerged:1;
1354 unsigned is_binary:1;
1355 unsigned is_renamed:1;
1356 unsigned is_interesting:1;
1357 uintmax_t added, deleted;
1358 } **files;
1359 };
1360
1361 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1362 const char *name_a,
1363 const char *name_b)
1364 {
1365 struct diffstat_file *x;
1366 x = xcalloc(1, sizeof(*x));
1367 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1368 diffstat->files[diffstat->nr++] = x;
1369 if (name_b) {
1370 x->from_name = xstrdup(name_a);
1371 x->name = xstrdup(name_b);
1372 x->is_renamed = 1;
1373 }
1374 else {
1375 x->from_name = NULL;
1376 x->name = xstrdup(name_a);
1377 }
1378 return x;
1379 }
1380
1381 static void diffstat_consume(void *priv, char *line, unsigned long len)
1382 {
1383 struct diffstat_t *diffstat = priv;
1384 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1385
1386 if (line[0] == '+')
1387 x->added++;
1388 else if (line[0] == '-')
1389 x->deleted++;
1390 }
1391
1392 const char mime_boundary_leader[] = "------------";
1393
1394 static int scale_linear(int it, int width, int max_change)
1395 {
1396 if (!it)
1397 return 0;
1398 /*
1399 * make sure that at least one '-' or '+' is printed if
1400 * there is any change to this path. The easiest way is to
1401 * scale linearly as if the alloted width is one column shorter
1402 * than it is, and then add 1 to the result.
1403 */
1404 return 1 + (it * (width - 1) / max_change);
1405 }
1406
1407 static void show_name(FILE *file,
1408 const char *prefix, const char *name, int len)
1409 {
1410 fprintf(file, " %s%-*s |", prefix, len, name);
1411 }
1412
1413 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1414 {
1415 if (cnt <= 0)
1416 return;
1417 fprintf(file, "%s", set);
1418 while (cnt--)
1419 putc(ch, file);
1420 fprintf(file, "%s", reset);
1421 }
1422
1423 static void fill_print_name(struct diffstat_file *file)
1424 {
1425 char *pname;
1426
1427 if (file->print_name)
1428 return;
1429
1430 if (!file->is_renamed) {
1431 struct strbuf buf = STRBUF_INIT;
1432 if (quote_c_style(file->name, &buf, NULL, 0)) {
1433 pname = strbuf_detach(&buf, NULL);
1434 } else {
1435 pname = file->name;
1436 strbuf_release(&buf);
1437 }
1438 } else {
1439 pname = pprint_rename(file->from_name, file->name);
1440 }
1441 file->print_name = pname;
1442 }
1443
1444 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1445 {
1446 struct strbuf sb = STRBUF_INIT;
1447 int ret;
1448
1449 if (!files) {
1450 assert(insertions == 0 && deletions == 0);
1451 return fprintf(fp, "%s\n", " 0 files changed");
1452 }
1453
1454 strbuf_addf(&sb,
1455 (files == 1) ? " %d file changed" : " %d files changed",
1456 files);
1457
1458 /*
1459 * For binary diff, the caller may want to print "x files
1460 * changed" with insertions == 0 && deletions == 0.
1461 *
1462 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1463 * is probably less confusing (i.e skip over "2 files changed
1464 * but nothing about added/removed lines? Is this a bug in Git?").
1465 */
1466 if (insertions || deletions == 0) {
1467 strbuf_addf(&sb,
1468 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1469 insertions);
1470 }
1471
1472 if (deletions || insertions == 0) {
1473 strbuf_addf(&sb,
1474 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1475 deletions);
1476 }
1477 strbuf_addch(&sb, '\n');
1478 ret = fputs(sb.buf, fp);
1479 strbuf_release(&sb);
1480 return ret;
1481 }
1482
1483 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1484 {
1485 int i, len, add, del, adds = 0, dels = 0;
1486 uintmax_t max_change = 0, max_len = 0;
1487 int total_files = data->nr, count;
1488 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1489 const char *reset, *add_c, *del_c;
1490 const char *line_prefix = "";
1491 int extra_shown = 0;
1492
1493 if (data->nr == 0)
1494 return;
1495
1496 line_prefix = diff_line_prefix(options);
1497 count = options->stat_count ? options->stat_count : data->nr;
1498
1499 reset = diff_get_color_opt(options, DIFF_RESET);
1500 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1501 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1502
1503 /*
1504 * Find the longest filename and max number of changes
1505 */
1506 for (i = 0; (i < count) && (i < data->nr); i++) {
1507 struct diffstat_file *file = data->files[i];
1508 uintmax_t change = file->added + file->deleted;
1509
1510 if (!file->is_interesting && (change == 0)) {
1511 count++; /* not shown == room for one more */
1512 continue;
1513 }
1514 fill_print_name(file);
1515 len = strlen(file->print_name);
1516 if (max_len < len)
1517 max_len = len;
1518
1519 if (file->is_unmerged) {
1520 /* "Unmerged" is 8 characters */
1521 bin_width = bin_width < 8 ? 8 : bin_width;
1522 continue;
1523 }
1524 if (file->is_binary) {
1525 /* "Bin XXX -> YYY bytes" */
1526 int w = 14 + decimal_width(file->added)
1527 + decimal_width(file->deleted);
1528 bin_width = bin_width < w ? w : bin_width;
1529 /* Display change counts aligned with "Bin" */
1530 number_width = 3;
1531 continue;
1532 }
1533
1534 if (max_change < change)
1535 max_change = change;
1536 }
1537 count = i; /* where we can stop scanning in data->files[] */
1538
1539 /*
1540 * We have width = stat_width or term_columns() columns total.
1541 * We want a maximum of min(max_len, stat_name_width) for the name part.
1542 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1543 * We also need 1 for " " and 4 + decimal_width(max_change)
1544 * for " | NNNN " and one the empty column at the end, altogether
1545 * 6 + decimal_width(max_change).
1546 *
1547 * If there's not enough space, we will use the smaller of
1548 * stat_name_width (if set) and 5/8*width for the filename,
1549 * and the rest for constant elements + graph part, but no more
1550 * than stat_graph_width for the graph part.
1551 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1552 * for the standard terminal size).
1553 *
1554 * In other words: stat_width limits the maximum width, and
1555 * stat_name_width fixes the maximum width of the filename,
1556 * and is also used to divide available columns if there
1557 * aren't enough.
1558 *
1559 * Binary files are displayed with "Bin XXX -> YYY bytes"
1560 * instead of the change count and graph. This part is treated
1561 * similarly to the graph part, except that it is not
1562 * "scaled". If total width is too small to accommodate the
1563 * guaranteed minimum width of the filename part and the
1564 * separators and this message, this message will "overflow"
1565 * making the line longer than the maximum width.
1566 */
1567
1568 if (options->stat_width == -1)
1569 width = term_columns() - options->output_prefix_length;
1570 else
1571 width = options->stat_width ? options->stat_width : 80;
1572 number_width = decimal_width(max_change) > number_width ?
1573 decimal_width(max_change) : number_width;
1574
1575 if (options->stat_graph_width == -1)
1576 options->stat_graph_width = diff_stat_graph_width;
1577
1578 /*
1579 * Guarantee 3/8*16==6 for the graph part
1580 * and 5/8*16==10 for the filename part
1581 */
1582 if (width < 16 + 6 + number_width)
1583 width = 16 + 6 + number_width;
1584
1585 /*
1586 * First assign sizes that are wanted, ignoring available width.
1587 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1588 * starting from "XXX" should fit in graph_width.
1589 */
1590 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1591 if (options->stat_graph_width &&
1592 options->stat_graph_width < graph_width)
1593 graph_width = options->stat_graph_width;
1594
1595 name_width = (options->stat_name_width > 0 &&
1596 options->stat_name_width < max_len) ?
1597 options->stat_name_width : max_len;
1598
1599 /*
1600 * Adjust adjustable widths not to exceed maximum width
1601 */
1602 if (name_width + number_width + 6 + graph_width > width) {
1603 if (graph_width > width * 3/8 - number_width - 6) {
1604 graph_width = width * 3/8 - number_width - 6;
1605 if (graph_width < 6)
1606 graph_width = 6;
1607 }
1608
1609 if (options->stat_graph_width &&
1610 graph_width > options->stat_graph_width)
1611 graph_width = options->stat_graph_width;
1612 if (name_width > width - number_width - 6 - graph_width)
1613 name_width = width - number_width - 6 - graph_width;
1614 else
1615 graph_width = width - number_width - 6 - name_width;
1616 }
1617
1618 /*
1619 * From here name_width is the width of the name area,
1620 * and graph_width is the width of the graph area.
1621 * max_change is used to scale graph properly.
1622 */
1623 for (i = 0; i < count; i++) {
1624 const char *prefix = "";
1625 struct diffstat_file *file = data->files[i];
1626 char *name = file->print_name;
1627 uintmax_t added = file->added;
1628 uintmax_t deleted = file->deleted;
1629 int name_len;
1630
1631 if (!file->is_interesting && (added + deleted == 0))
1632 continue;
1633
1634 /*
1635 * "scale" the filename
1636 */
1637 len = name_width;
1638 name_len = strlen(name);
1639 if (name_width < name_len) {
1640 char *slash;
1641 prefix = "...";
1642 len -= 3;
1643 name += name_len - len;
1644 slash = strchr(name, '/');
1645 if (slash)
1646 name = slash;
1647 }
1648
1649 if (file->is_binary) {
1650 fprintf(options->file, "%s", line_prefix);
1651 show_name(options->file, prefix, name, len);
1652 fprintf(options->file, " %*s", number_width, "Bin");
1653 if (!added && !deleted) {
1654 putc('\n', options->file);
1655 continue;
1656 }
1657 fprintf(options->file, " %s%"PRIuMAX"%s",
1658 del_c, deleted, reset);
1659 fprintf(options->file, " -> ");
1660 fprintf(options->file, "%s%"PRIuMAX"%s",
1661 add_c, added, reset);
1662 fprintf(options->file, " bytes");
1663 fprintf(options->file, "\n");
1664 continue;
1665 }
1666 else if (file->is_unmerged) {
1667 fprintf(options->file, "%s", line_prefix);
1668 show_name(options->file, prefix, name, len);
1669 fprintf(options->file, " Unmerged\n");
1670 continue;
1671 }
1672
1673 /*
1674 * scale the add/delete
1675 */
1676 add = added;
1677 del = deleted;
1678
1679 if (graph_width <= max_change) {
1680 int total = scale_linear(add + del, graph_width, max_change);
1681 if (total < 2 && add && del)
1682 /* width >= 2 due to the sanity check */
1683 total = 2;
1684 if (add < del) {
1685 add = scale_linear(add, graph_width, max_change);
1686 del = total - add;
1687 } else {
1688 del = scale_linear(del, graph_width, max_change);
1689 add = total - del;
1690 }
1691 }
1692 fprintf(options->file, "%s", line_prefix);
1693 show_name(options->file, prefix, name, len);
1694 fprintf(options->file, " %*"PRIuMAX"%s",
1695 number_width, added + deleted,
1696 added + deleted ? " " : "");
1697 show_graph(options->file, '+', add, add_c, reset);
1698 show_graph(options->file, '-', del, del_c, reset);
1699 fprintf(options->file, "\n");
1700 }
1701
1702 for (i = 0; i < data->nr; i++) {
1703 struct diffstat_file *file = data->files[i];
1704 uintmax_t added = file->added;
1705 uintmax_t deleted = file->deleted;
1706
1707 if (file->is_unmerged ||
1708 (!file->is_interesting && (added + deleted == 0))) {
1709 total_files--;
1710 continue;
1711 }
1712
1713 if (!file->is_binary) {
1714 adds += added;
1715 dels += deleted;
1716 }
1717 if (i < count)
1718 continue;
1719 if (!extra_shown)
1720 fprintf(options->file, "%s ...\n", line_prefix);
1721 extra_shown = 1;
1722 }
1723 fprintf(options->file, "%s", line_prefix);
1724 print_stat_summary(options->file, total_files, adds, dels);
1725 }
1726
1727 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1728 {
1729 int i, adds = 0, dels = 0, total_files = data->nr;
1730
1731 if (data->nr == 0)
1732 return;
1733
1734 for (i = 0; i < data->nr; i++) {
1735 int added = data->files[i]->added;
1736 int deleted= data->files[i]->deleted;
1737
1738 if (data->files[i]->is_unmerged ||
1739 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1740 total_files--;
1741 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1742 adds += added;
1743 dels += deleted;
1744 }
1745 }
1746 fprintf(options->file, "%s", diff_line_prefix(options));
1747 print_stat_summary(options->file, total_files, adds, dels);
1748 }
1749
1750 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1751 {
1752 int i;
1753
1754 if (data->nr == 0)
1755 return;
1756
1757 for (i = 0; i < data->nr; i++) {
1758 struct diffstat_file *file = data->files[i];
1759
1760 fprintf(options->file, "%s", diff_line_prefix(options));
1761
1762 if (file->is_binary)
1763 fprintf(options->file, "-\t-\t");
1764 else
1765 fprintf(options->file,
1766 "%"PRIuMAX"\t%"PRIuMAX"\t",
1767 file->added, file->deleted);
1768 if (options->line_termination) {
1769 fill_print_name(file);
1770 if (!file->is_renamed)
1771 write_name_quoted(file->name, options->file,
1772 options->line_termination);
1773 else {
1774 fputs(file->print_name, options->file);
1775 putc(options->line_termination, options->file);
1776 }
1777 } else {
1778 if (file->is_renamed) {
1779 putc('\0', options->file);
1780 write_name_quoted(file->from_name, options->file, '\0');
1781 }
1782 write_name_quoted(file->name, options->file, '\0');
1783 }
1784 }
1785 }
1786
1787 struct dirstat_file {
1788 const char *name;
1789 unsigned long changed;
1790 };
1791
1792 struct dirstat_dir {
1793 struct dirstat_file *files;
1794 int alloc, nr, permille, cumulative;
1795 };
1796
1797 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1798 unsigned long changed, const char *base, int baselen)
1799 {
1800 unsigned long this_dir = 0;
1801 unsigned int sources = 0;
1802 const char *line_prefix = diff_line_prefix(opt);
1803
1804 while (dir->nr) {
1805 struct dirstat_file *f = dir->files;
1806 int namelen = strlen(f->name);
1807 unsigned long this;
1808 char *slash;
1809
1810 if (namelen < baselen)
1811 break;
1812 if (memcmp(f->name, base, baselen))
1813 break;
1814 slash = strchr(f->name + baselen, '/');
1815 if (slash) {
1816 int newbaselen = slash + 1 - f->name;
1817 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1818 sources++;
1819 } else {
1820 this = f->changed;
1821 dir->files++;
1822 dir->nr--;
1823 sources += 2;
1824 }
1825 this_dir += this;
1826 }
1827
1828 /*
1829 * We don't report dirstat's for
1830 * - the top level
1831 * - or cases where everything came from a single directory
1832 * under this directory (sources == 1).
1833 */
1834 if (baselen && sources != 1) {
1835 if (this_dir) {
1836 int permille = this_dir * 1000 / changed;
1837 if (permille >= dir->permille) {
1838 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1839 permille / 10, permille % 10, baselen, base);
1840 if (!dir->cumulative)
1841 return 0;
1842 }
1843 }
1844 }
1845 return this_dir;
1846 }
1847
1848 static int dirstat_compare(const void *_a, const void *_b)
1849 {
1850 const struct dirstat_file *a = _a;
1851 const struct dirstat_file *b = _b;
1852 return strcmp(a->name, b->name);
1853 }
1854
1855 static void show_dirstat(struct diff_options *options)
1856 {
1857 int i;
1858 unsigned long changed;
1859 struct dirstat_dir dir;
1860 struct diff_queue_struct *q = &diff_queued_diff;
1861
1862 dir.files = NULL;
1863 dir.alloc = 0;
1864 dir.nr = 0;
1865 dir.permille = options->dirstat_permille;
1866 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1867
1868 changed = 0;
1869 for (i = 0; i < q->nr; i++) {
1870 struct diff_filepair *p = q->queue[i];
1871 const char *name;
1872 unsigned long copied, added, damage;
1873 int content_changed;
1874
1875 name = p->two->path ? p->two->path : p->one->path;
1876
1877 if (p->one->sha1_valid && p->two->sha1_valid)
1878 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1879 else
1880 content_changed = 1;
1881
1882 if (!content_changed) {
1883 /*
1884 * The SHA1 has not changed, so pre-/post-content is
1885 * identical. We can therefore skip looking at the
1886 * file contents altogether.
1887 */
1888 damage = 0;
1889 goto found_damage;
1890 }
1891
1892 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1893 /*
1894 * In --dirstat-by-file mode, we don't really need to
1895 * look at the actual file contents at all.
1896 * The fact that the SHA1 changed is enough for us to
1897 * add this file to the list of results
1898 * (with each file contributing equal damage).
1899 */
1900 damage = 1;
1901 goto found_damage;
1902 }
1903
1904 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1905 diff_populate_filespec(p->one, 0);
1906 diff_populate_filespec(p->two, 0);
1907 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1908 &copied, &added);
1909 diff_free_filespec_data(p->one);
1910 diff_free_filespec_data(p->two);
1911 } else if (DIFF_FILE_VALID(p->one)) {
1912 diff_populate_filespec(p->one, 1);
1913 copied = added = 0;
1914 diff_free_filespec_data(p->one);
1915 } else if (DIFF_FILE_VALID(p->two)) {
1916 diff_populate_filespec(p->two, 1);
1917 copied = 0;
1918 added = p->two->size;
1919 diff_free_filespec_data(p->two);
1920 } else
1921 continue;
1922
1923 /*
1924 * Original minus copied is the removed material,
1925 * added is the new material. They are both damages
1926 * made to the preimage.
1927 * If the resulting damage is zero, we know that
1928 * diffcore_count_changes() considers the two entries to
1929 * be identical, but since content_changed is true, we
1930 * know that there must have been _some_ kind of change,
1931 * so we force all entries to have damage > 0.
1932 */
1933 damage = (p->one->size - copied) + added;
1934 if (!damage)
1935 damage = 1;
1936
1937 found_damage:
1938 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1939 dir.files[dir.nr].name = name;
1940 dir.files[dir.nr].changed = damage;
1941 changed += damage;
1942 dir.nr++;
1943 }
1944
1945 /* This can happen even with many files, if everything was renames */
1946 if (!changed)
1947 return;
1948
1949 /* Show all directories with more than x% of the changes */
1950 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1951 gather_dirstat(options, &dir, changed, "", 0);
1952 }
1953
1954 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1955 {
1956 int i;
1957 unsigned long changed;
1958 struct dirstat_dir dir;
1959
1960 if (data->nr == 0)
1961 return;
1962
1963 dir.files = NULL;
1964 dir.alloc = 0;
1965 dir.nr = 0;
1966 dir.permille = options->dirstat_permille;
1967 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1968
1969 changed = 0;
1970 for (i = 0; i < data->nr; i++) {
1971 struct diffstat_file *file = data->files[i];
1972 unsigned long damage = file->added + file->deleted;
1973 if (file->is_binary)
1974 /*
1975 * binary files counts bytes, not lines. Must find some
1976 * way to normalize binary bytes vs. textual lines.
1977 * The following heuristic assumes that there are 64
1978 * bytes per "line".
1979 * This is stupid and ugly, but very cheap...
1980 */
1981 damage = (damage + 63) / 64;
1982 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1983 dir.files[dir.nr].name = file->name;
1984 dir.files[dir.nr].changed = damage;
1985 changed += damage;
1986 dir.nr++;
1987 }
1988
1989 /* This can happen even with many files, if everything was renames */
1990 if (!changed)
1991 return;
1992
1993 /* Show all directories with more than x% of the changes */
1994 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1995 gather_dirstat(options, &dir, changed, "", 0);
1996 }
1997
1998 static void free_diffstat_info(struct diffstat_t *diffstat)
1999 {
2000 int i;
2001 for (i = 0; i < diffstat->nr; i++) {
2002 struct diffstat_file *f = diffstat->files[i];
2003 if (f->name != f->print_name)
2004 free(f->print_name);
2005 free(f->name);
2006 free(f->from_name);
2007 free(f);
2008 }
2009 free(diffstat->files);
2010 }
2011
2012 struct checkdiff_t {
2013 const char *filename;
2014 int lineno;
2015 int conflict_marker_size;
2016 struct diff_options *o;
2017 unsigned ws_rule;
2018 unsigned status;
2019 };
2020
2021 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2022 {
2023 char firstchar;
2024 int cnt;
2025
2026 if (len < marker_size + 1)
2027 return 0;
2028 firstchar = line[0];
2029 switch (firstchar) {
2030 case '=': case '>': case '<': case '|':
2031 break;
2032 default:
2033 return 0;
2034 }
2035 for (cnt = 1; cnt < marker_size; cnt++)
2036 if (line[cnt] != firstchar)
2037 return 0;
2038 /* line[1] thru line[marker_size-1] are same as firstchar */
2039 if (len < marker_size + 1 || !isspace(line[marker_size]))
2040 return 0;
2041 return 1;
2042 }
2043
2044 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2045 {
2046 struct checkdiff_t *data = priv;
2047 int marker_size = data->conflict_marker_size;
2048 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2049 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2050 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2051 char *err;
2052 const char *line_prefix;
2053
2054 assert(data->o);
2055 line_prefix = diff_line_prefix(data->o);
2056
2057 if (line[0] == '+') {
2058 unsigned bad;
2059 data->lineno++;
2060 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2061 data->status |= 1;
2062 fprintf(data->o->file,
2063 "%s%s:%d: leftover conflict marker\n",
2064 line_prefix, data->filename, data->lineno);
2065 }
2066 bad = ws_check(line + 1, len - 1, data->ws_rule);
2067 if (!bad)
2068 return;
2069 data->status |= bad;
2070 err = whitespace_error_string(bad);
2071 fprintf(data->o->file, "%s%s:%d: %s.\n",
2072 line_prefix, data->filename, data->lineno, err);
2073 free(err);
2074 emit_line(data->o, set, reset, line, 1);
2075 ws_check_emit(line + 1, len - 1, data->ws_rule,
2076 data->o->file, set, reset, ws);
2077 } else if (line[0] == ' ') {
2078 data->lineno++;
2079 } else if (line[0] == '@') {
2080 char *plus = strchr(line, '+');
2081 if (plus)
2082 data->lineno = strtol(plus, NULL, 10) - 1;
2083 else
2084 die("invalid diff");
2085 }
2086 }
2087
2088 static unsigned char *deflate_it(char *data,
2089 unsigned long size,
2090 unsigned long *result_size)
2091 {
2092 int bound;
2093 unsigned char *deflated;
2094 git_zstream stream;
2095
2096 memset(&stream, 0, sizeof(stream));
2097 git_deflate_init(&stream, zlib_compression_level);
2098 bound = git_deflate_bound(&stream, size);
2099 deflated = xmalloc(bound);
2100 stream.next_out = deflated;
2101 stream.avail_out = bound;
2102
2103 stream.next_in = (unsigned char *)data;
2104 stream.avail_in = size;
2105 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2106 ; /* nothing */
2107 git_deflate_end(&stream);
2108 *result_size = stream.total_out;
2109 return deflated;
2110 }
2111
2112 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2113 const char *prefix)
2114 {
2115 void *cp;
2116 void *delta;
2117 void *deflated;
2118 void *data;
2119 unsigned long orig_size;
2120 unsigned long delta_size;
2121 unsigned long deflate_size;
2122 unsigned long data_size;
2123
2124 /* We could do deflated delta, or we could do just deflated two,
2125 * whichever is smaller.
2126 */
2127 delta = NULL;
2128 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2129 if (one->size && two->size) {
2130 delta = diff_delta(one->ptr, one->size,
2131 two->ptr, two->size,
2132 &delta_size, deflate_size);
2133 if (delta) {
2134 void *to_free = delta;
2135 orig_size = delta_size;
2136 delta = deflate_it(delta, delta_size, &delta_size);
2137 free(to_free);
2138 }
2139 }
2140
2141 if (delta && delta_size < deflate_size) {
2142 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2143 free(deflated);
2144 data = delta;
2145 data_size = delta_size;
2146 }
2147 else {
2148 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2149 free(delta);
2150 data = deflated;
2151 data_size = deflate_size;
2152 }
2153
2154 /* emit data encoded in base85 */
2155 cp = data;
2156 while (data_size) {
2157 int bytes = (52 < data_size) ? 52 : data_size;
2158 char line[70];
2159 data_size -= bytes;
2160 if (bytes <= 26)
2161 line[0] = bytes + 'A' - 1;
2162 else
2163 line[0] = bytes - 26 + 'a' - 1;
2164 encode_85(line + 1, cp, bytes);
2165 cp = (char *) cp + bytes;
2166 fprintf(file, "%s", prefix);
2167 fputs(line, file);
2168 fputc('\n', file);
2169 }
2170 fprintf(file, "%s\n", prefix);
2171 free(data);
2172 }
2173
2174 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2175 const char *prefix)
2176 {
2177 fprintf(file, "%sGIT binary patch\n", prefix);
2178 emit_binary_diff_body(file, one, two, prefix);
2179 emit_binary_diff_body(file, two, one, prefix);
2180 }
2181
2182 int diff_filespec_is_binary(struct diff_filespec *one)
2183 {
2184 if (one->is_binary == -1) {
2185 diff_filespec_load_driver(one);
2186 if (one->driver->binary != -1)
2187 one->is_binary = one->driver->binary;
2188 else {
2189 if (!one->data && DIFF_FILE_VALID(one))
2190 diff_populate_filespec(one, 0);
2191 if (one->data)
2192 one->is_binary = buffer_is_binary(one->data,
2193 one->size);
2194 if (one->is_binary == -1)
2195 one->is_binary = 0;
2196 }
2197 }
2198 return one->is_binary;
2199 }
2200
2201 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2202 {
2203 diff_filespec_load_driver(one);
2204 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2205 }
2206
2207 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2208 {
2209 if (!options->a_prefix)
2210 options->a_prefix = a;
2211 if (!options->b_prefix)
2212 options->b_prefix = b;
2213 }
2214
2215 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2216 {
2217 if (!DIFF_FILE_VALID(one))
2218 return NULL;
2219
2220 diff_filespec_load_driver(one);
2221 return userdiff_get_textconv(one->driver);
2222 }
2223
2224 static void builtin_diff(const char *name_a,
2225 const char *name_b,
2226 struct diff_filespec *one,
2227 struct diff_filespec *two,
2228 const char *xfrm_msg,
2229 int must_show_header,
2230 struct diff_options *o,
2231 int complete_rewrite)
2232 {
2233 mmfile_t mf1, mf2;
2234 const char *lbl[2];
2235 char *a_one, *b_two;
2236 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2237 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2238 const char *a_prefix, *b_prefix;
2239 struct userdiff_driver *textconv_one = NULL;
2240 struct userdiff_driver *textconv_two = NULL;
2241 struct strbuf header = STRBUF_INIT;
2242 const char *line_prefix = diff_line_prefix(o);
2243
2244 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2245 (!one->mode || S_ISGITLINK(one->mode)) &&
2246 (!two->mode || S_ISGITLINK(two->mode))) {
2247 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2248 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2249 show_submodule_summary(o->file, one->path ? one->path : two->path,
2250 line_prefix,
2251 one->sha1, two->sha1, two->dirty_submodule,
2252 meta, del, add, reset);
2253 return;
2254 }
2255
2256 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2257 textconv_one = get_textconv(one);
2258 textconv_two = get_textconv(two);
2259 }
2260
2261 diff_set_mnemonic_prefix(o, "a/", "b/");
2262 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2263 a_prefix = o->b_prefix;
2264 b_prefix = o->a_prefix;
2265 } else {
2266 a_prefix = o->a_prefix;
2267 b_prefix = o->b_prefix;
2268 }
2269
2270 /* Never use a non-valid filename anywhere if at all possible */
2271 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2272 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2273
2274 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2275 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2276 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2277 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2278 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2279 if (lbl[0][0] == '/') {
2280 /* /dev/null */
2281 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2282 if (xfrm_msg)
2283 strbuf_addstr(&header, xfrm_msg);
2284 must_show_header = 1;
2285 }
2286 else if (lbl[1][0] == '/') {
2287 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2288 if (xfrm_msg)
2289 strbuf_addstr(&header, xfrm_msg);
2290 must_show_header = 1;
2291 }
2292 else {
2293 if (one->mode != two->mode) {
2294 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2295 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2296 must_show_header = 1;
2297 }
2298 if (xfrm_msg)
2299 strbuf_addstr(&header, xfrm_msg);
2300
2301 /*
2302 * we do not run diff between different kind
2303 * of objects.
2304 */
2305 if ((one->mode ^ two->mode) & S_IFMT)
2306 goto free_ab_and_return;
2307 if (complete_rewrite &&
2308 (textconv_one || !diff_filespec_is_binary(one)) &&
2309 (textconv_two || !diff_filespec_is_binary(two))) {
2310 fprintf(o->file, "%s", header.buf);
2311 strbuf_reset(&header);
2312 emit_rewrite_diff(name_a, name_b, one, two,
2313 textconv_one, textconv_two, o);
2314 o->found_changes = 1;
2315 goto free_ab_and_return;
2316 }
2317 }
2318
2319 if (o->irreversible_delete && lbl[1][0] == '/') {
2320 fprintf(o->file, "%s", header.buf);
2321 strbuf_reset(&header);
2322 goto free_ab_and_return;
2323 } else if (!DIFF_OPT_TST(o, TEXT) &&
2324 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2325 (!textconv_two && diff_filespec_is_binary(two)) )) {
2326 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2327 die("unable to read files to diff");
2328 /* Quite common confusing case */
2329 if (mf1.size == mf2.size &&
2330 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2331 if (must_show_header)
2332 fprintf(o->file, "%s", header.buf);
2333 goto free_ab_and_return;
2334 }
2335 fprintf(o->file, "%s", header.buf);
2336 strbuf_reset(&header);
2337 if (DIFF_OPT_TST(o, BINARY))
2338 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2339 else
2340 fprintf(o->file, "%sBinary files %s and %s differ\n",
2341 line_prefix, lbl[0], lbl[1]);
2342 o->found_changes = 1;
2343 } else {
2344 /* Crazy xdl interfaces.. */
2345 const char *diffopts = getenv("GIT_DIFF_OPTS");
2346 const char *v;
2347 xpparam_t xpp;
2348 xdemitconf_t xecfg;
2349 struct emit_callback ecbdata;
2350 const struct userdiff_funcname *pe;
2351
2352 if (must_show_header) {
2353 fprintf(o->file, "%s", header.buf);
2354 strbuf_reset(&header);
2355 }
2356
2357 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2358 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2359
2360 pe = diff_funcname_pattern(one);
2361 if (!pe)
2362 pe = diff_funcname_pattern(two);
2363
2364 memset(&xpp, 0, sizeof(xpp));
2365 memset(&xecfg, 0, sizeof(xecfg));
2366 memset(&ecbdata, 0, sizeof(ecbdata));
2367 ecbdata.label_path = lbl;
2368 ecbdata.color_diff = want_color(o->use_color);
2369 ecbdata.found_changesp = &o->found_changes;
2370 ecbdata.ws_rule = whitespace_rule(name_b);
2371 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2372 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2373 ecbdata.opt = o;
2374 ecbdata.header = header.len ? &header : NULL;
2375 xpp.flags = o->xdl_opts;
2376 xecfg.ctxlen = o->context;
2377 xecfg.interhunkctxlen = o->interhunkcontext;
2378 xecfg.flags = XDL_EMIT_FUNCNAMES;
2379 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2380 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2381 if (pe)
2382 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2383 if (!diffopts)
2384 ;
2385 else if (skip_prefix(diffopts, "--unified=", &v))
2386 xecfg.ctxlen = strtoul(v, NULL, 10);
2387 else if (skip_prefix(diffopts, "-u", &v))
2388 xecfg.ctxlen = strtoul(v, NULL, 10);
2389 if (o->word_diff)
2390 init_diff_words_data(&ecbdata, o, one, two);
2391 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2392 &xpp, &xecfg);
2393 if (o->word_diff)
2394 free_diff_words_data(&ecbdata);
2395 if (textconv_one)
2396 free(mf1.ptr);
2397 if (textconv_two)
2398 free(mf2.ptr);
2399 xdiff_clear_find_func(&xecfg);
2400 }
2401
2402 free_ab_and_return:
2403 strbuf_release(&header);
2404 diff_free_filespec_data(one);
2405 diff_free_filespec_data(two);
2406 free(a_one);
2407 free(b_two);
2408 return;
2409 }
2410
2411 static void builtin_diffstat(const char *name_a, const char *name_b,
2412 struct diff_filespec *one,
2413 struct diff_filespec *two,
2414 struct diffstat_t *diffstat,
2415 struct diff_options *o,
2416 struct diff_filepair *p)
2417 {
2418 mmfile_t mf1, mf2;
2419 struct diffstat_file *data;
2420 int same_contents;
2421 int complete_rewrite = 0;
2422
2423 if (!DIFF_PAIR_UNMERGED(p)) {
2424 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2425 complete_rewrite = 1;
2426 }
2427
2428 data = diffstat_add(diffstat, name_a, name_b);
2429 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2430
2431 if (!one || !two) {
2432 data->is_unmerged = 1;
2433 return;
2434 }
2435
2436 same_contents = !hashcmp(one->sha1, two->sha1);
2437
2438 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2439 data->is_binary = 1;
2440 if (same_contents) {
2441 data->added = 0;
2442 data->deleted = 0;
2443 } else {
2444 data->added = diff_filespec_size(two);
2445 data->deleted = diff_filespec_size(one);
2446 }
2447 }
2448
2449 else if (complete_rewrite) {
2450 diff_populate_filespec(one, 0);
2451 diff_populate_filespec(two, 0);
2452 data->deleted = count_lines(one->data, one->size);
2453 data->added = count_lines(two->data, two->size);
2454 }
2455
2456 else if (!same_contents) {
2457 /* Crazy xdl interfaces.. */
2458 xpparam_t xpp;
2459 xdemitconf_t xecfg;
2460
2461 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2462 die("unable to read files to diff");
2463
2464 memset(&xpp, 0, sizeof(xpp));
2465 memset(&xecfg, 0, sizeof(xecfg));
2466 xpp.flags = o->xdl_opts;
2467 xecfg.ctxlen = o->context;
2468 xecfg.interhunkctxlen = o->interhunkcontext;
2469 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2470 &xpp, &xecfg);
2471 }
2472
2473 diff_free_filespec_data(one);
2474 diff_free_filespec_data(two);
2475 }
2476
2477 static void builtin_checkdiff(const char *name_a, const char *name_b,
2478 const char *attr_path,
2479 struct diff_filespec *one,
2480 struct diff_filespec *two,
2481 struct diff_options *o)
2482 {
2483 mmfile_t mf1, mf2;
2484 struct checkdiff_t data;
2485
2486 if (!two)
2487 return;
2488
2489 memset(&data, 0, sizeof(data));
2490 data.filename = name_b ? name_b : name_a;
2491 data.lineno = 0;
2492 data.o = o;
2493 data.ws_rule = whitespace_rule(attr_path);
2494 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2495
2496 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2497 die("unable to read files to diff");
2498
2499 /*
2500 * All the other codepaths check both sides, but not checking
2501 * the "old" side here is deliberate. We are checking the newly
2502 * introduced changes, and as long as the "new" side is text, we
2503 * can and should check what it introduces.
2504 */
2505 if (diff_filespec_is_binary(two))
2506 goto free_and_return;
2507 else {
2508 /* Crazy xdl interfaces.. */
2509 xpparam_t xpp;
2510 xdemitconf_t xecfg;
2511
2512 memset(&xpp, 0, sizeof(xpp));
2513 memset(&xecfg, 0, sizeof(xecfg));
2514 xecfg.ctxlen = 1; /* at least one context line */
2515 xpp.flags = 0;
2516 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2517 &xpp, &xecfg);
2518
2519 if (data.ws_rule & WS_BLANK_AT_EOF) {
2520 struct emit_callback ecbdata;
2521 int blank_at_eof;
2522
2523 ecbdata.ws_rule = data.ws_rule;
2524 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2525 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2526
2527 if (blank_at_eof) {
2528 static char *err;
2529 if (!err)
2530 err = whitespace_error_string(WS_BLANK_AT_EOF);
2531 fprintf(o->file, "%s:%d: %s.\n",
2532 data.filename, blank_at_eof, err);
2533 data.status = 1; /* report errors */
2534 }
2535 }
2536 }
2537 free_and_return:
2538 diff_free_filespec_data(one);
2539 diff_free_filespec_data(two);
2540 if (data.status)
2541 DIFF_OPT_SET(o, CHECK_FAILED);
2542 }
2543
2544 struct diff_filespec *alloc_filespec(const char *path)
2545 {
2546 int namelen = strlen(path);
2547 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2548
2549 memset(spec, 0, sizeof(*spec));
2550 spec->path = (char *)(spec + 1);
2551 memcpy(spec->path, path, namelen+1);
2552 spec->count = 1;
2553 spec->is_binary = -1;
2554 return spec;
2555 }
2556
2557 void free_filespec(struct diff_filespec *spec)
2558 {
2559 if (!--spec->count) {
2560 diff_free_filespec_data(spec);
2561 free(spec);
2562 }
2563 }
2564
2565 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2566 int sha1_valid, unsigned short mode)
2567 {
2568 if (mode) {
2569 spec->mode = canon_mode(mode);
2570 hashcpy(spec->sha1, sha1);
2571 spec->sha1_valid = sha1_valid;
2572 }
2573 }
2574
2575 /*
2576 * Given a name and sha1 pair, if the index tells us the file in
2577 * the work tree has that object contents, return true, so that
2578 * prepare_temp_file() does not have to inflate and extract.
2579 */
2580 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2581 {
2582 const struct cache_entry *ce;
2583 struct stat st;
2584 int pos, len;
2585
2586 /*
2587 * We do not read the cache ourselves here, because the
2588 * benchmark with my previous version that always reads cache
2589 * shows that it makes things worse for diff-tree comparing
2590 * two linux-2.6 kernel trees in an already checked out work
2591 * tree. This is because most diff-tree comparisons deal with
2592 * only a small number of files, while reading the cache is
2593 * expensive for a large project, and its cost outweighs the
2594 * savings we get by not inflating the object to a temporary
2595 * file. Practically, this code only helps when we are used
2596 * by diff-cache --cached, which does read the cache before
2597 * calling us.
2598 */
2599 if (!active_cache)
2600 return 0;
2601
2602 /* We want to avoid the working directory if our caller
2603 * doesn't need the data in a normal file, this system
2604 * is rather slow with its stat/open/mmap/close syscalls,
2605 * and the object is contained in a pack file. The pack
2606 * is probably already open and will be faster to obtain
2607 * the data through than the working directory. Loose
2608 * objects however would tend to be slower as they need
2609 * to be individually opened and inflated.
2610 */
2611 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2612 return 0;
2613
2614 len = strlen(name);
2615 pos = cache_name_pos(name, len);
2616 if (pos < 0)
2617 return 0;
2618 ce = active_cache[pos];
2619
2620 /*
2621 * This is not the sha1 we are looking for, or
2622 * unreusable because it is not a regular file.
2623 */
2624 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2625 return 0;
2626
2627 /*
2628 * If ce is marked as "assume unchanged", there is no
2629 * guarantee that work tree matches what we are looking for.
2630 */
2631 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2632 return 0;
2633
2634 /*
2635 * If ce matches the file in the work tree, we can reuse it.
2636 */
2637 if (ce_uptodate(ce) ||
2638 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2639 return 1;
2640
2641 return 0;
2642 }
2643
2644 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2645 {
2646 int len;
2647 char *data = xmalloc(100), *dirty = "";
2648
2649 /* Are we looking at the work tree? */
2650 if (s->dirty_submodule)
2651 dirty = "-dirty";
2652
2653 len = snprintf(data, 100,
2654 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2655 s->data = data;
2656 s->size = len;
2657 s->should_free = 1;
2658 if (size_only) {
2659 s->data = NULL;
2660 free(data);
2661 }
2662 return 0;
2663 }
2664
2665 /*
2666 * While doing rename detection and pickaxe operation, we may need to
2667 * grab the data for the blob (or file) for our own in-core comparison.
2668 * diff_filespec has data and size fields for this purpose.
2669 */
2670 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2671 {
2672 int err = 0;
2673 /*
2674 * demote FAIL to WARN to allow inspecting the situation
2675 * instead of refusing.
2676 */
2677 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2678 ? SAFE_CRLF_WARN
2679 : safe_crlf);
2680
2681 if (!DIFF_FILE_VALID(s))
2682 die("internal error: asking to populate invalid file.");
2683 if (S_ISDIR(s->mode))
2684 return -1;
2685
2686 if (s->data)
2687 return 0;
2688
2689 if (size_only && 0 < s->size)
2690 return 0;
2691
2692 if (S_ISGITLINK(s->mode))
2693 return diff_populate_gitlink(s, size_only);
2694
2695 if (!s->sha1_valid ||
2696 reuse_worktree_file(s->path, s->sha1, 0)) {
2697 struct strbuf buf = STRBUF_INIT;
2698 struct stat st;
2699 int fd;
2700
2701 if (lstat(s->path, &st) < 0) {
2702 if (errno == ENOENT) {
2703 err_empty:
2704 err = -1;
2705 empty:
2706 s->data = (char *)"";
2707 s->size = 0;
2708 return err;
2709 }
2710 }
2711 s->size = xsize_t(st.st_size);
2712 if (!s->size)
2713 goto empty;
2714 if (S_ISLNK(st.st_mode)) {
2715 struct strbuf sb = STRBUF_INIT;
2716
2717 if (strbuf_readlink(&sb, s->path, s->size))
2718 goto err_empty;
2719 s->size = sb.len;
2720 s->data = strbuf_detach(&sb, NULL);
2721 s->should_free = 1;
2722 return 0;
2723 }
2724 if (size_only)
2725 return 0;
2726 fd = open(s->path, O_RDONLY);
2727 if (fd < 0)
2728 goto err_empty;
2729 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2730 close(fd);
2731 s->should_munmap = 1;
2732
2733 /*
2734 * Convert from working tree format to canonical git format
2735 */
2736 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2737 size_t size = 0;
2738 munmap(s->data, s->size);
2739 s->should_munmap = 0;
2740 s->data = strbuf_detach(&buf, &size);
2741 s->size = size;
2742 s->should_free = 1;
2743 }
2744 }
2745 else {
2746 enum object_type type;
2747 if (size_only) {
2748 type = sha1_object_info(s->sha1, &s->size);
2749 if (type < 0)
2750 die("unable to read %s", sha1_to_hex(s->sha1));
2751 } else {
2752 s->data = read_sha1_file(s->sha1, &type, &s->size);
2753 if (!s->data)
2754 die("unable to read %s", sha1_to_hex(s->sha1));
2755 s->should_free = 1;
2756 }
2757 }
2758 return 0;
2759 }
2760
2761 void diff_free_filespec_blob(struct diff_filespec *s)
2762 {
2763 if (s->should_free)
2764 free(s->data);
2765 else if (s->should_munmap)
2766 munmap(s->data, s->size);
2767
2768 if (s->should_free || s->should_munmap) {
2769 s->should_free = s->should_munmap = 0;
2770 s->data = NULL;
2771 }
2772 }
2773
2774 void diff_free_filespec_data(struct diff_filespec *s)
2775 {
2776 diff_free_filespec_blob(s);
2777 free(s->cnt_data);
2778 s->cnt_data = NULL;
2779 }
2780
2781 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2782 void *blob,
2783 unsigned long size,
2784 const unsigned char *sha1,
2785 int mode)
2786 {
2787 int fd;
2788 struct strbuf buf = STRBUF_INIT;
2789 struct strbuf template = STRBUF_INIT;
2790 char *path_dup = xstrdup(path);
2791 const char *base = basename(path_dup);
2792
2793 /* Generate "XXXXXX_basename.ext" */
2794 strbuf_addstr(&template, "XXXXXX_");
2795 strbuf_addstr(&template, base);
2796
2797 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2798 strlen(base) + 1);
2799 if (fd < 0)
2800 die_errno("unable to create temp-file");
2801 if (convert_to_working_tree(path,
2802 (const char *)blob, (size_t)size, &buf)) {
2803 blob = buf.buf;
2804 size = buf.len;
2805 }
2806 if (write_in_full(fd, blob, size) != size)
2807 die_errno("unable to write temp-file");
2808 close(fd);
2809 temp->name = temp->tmp_path;
2810 strcpy(temp->hex, sha1_to_hex(sha1));
2811 temp->hex[40] = 0;
2812 sprintf(temp->mode, "%06o", mode);
2813 strbuf_release(&buf);
2814 strbuf_release(&template);
2815 free(path_dup);
2816 }
2817
2818 static struct diff_tempfile *prepare_temp_file(const char *name,
2819 struct diff_filespec *one)
2820 {
2821 struct diff_tempfile *temp = claim_diff_tempfile();
2822
2823 if (!DIFF_FILE_VALID(one)) {
2824 not_a_valid_file:
2825 /* A '-' entry produces this for file-2, and
2826 * a '+' entry produces this for file-1.
2827 */
2828 temp->name = "/dev/null";
2829 strcpy(temp->hex, ".");
2830 strcpy(temp->mode, ".");
2831 return temp;
2832 }
2833
2834 if (!remove_tempfile_installed) {
2835 atexit(remove_tempfile);
2836 sigchain_push_common(remove_tempfile_on_signal);
2837 remove_tempfile_installed = 1;
2838 }
2839
2840 if (!S_ISGITLINK(one->mode) &&
2841 (!one->sha1_valid ||
2842 reuse_worktree_file(name, one->sha1, 1))) {
2843 struct stat st;
2844 if (lstat(name, &st) < 0) {
2845 if (errno == ENOENT)
2846 goto not_a_valid_file;
2847 die_errno("stat(%s)", name);
2848 }
2849 if (S_ISLNK(st.st_mode)) {
2850 struct strbuf sb = STRBUF_INIT;
2851 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2852 die_errno("readlink(%s)", name);
2853 prep_temp_blob(name, temp, sb.buf, sb.len,
2854 (one->sha1_valid ?
2855 one->sha1 : null_sha1),
2856 (one->sha1_valid ?
2857 one->mode : S_IFLNK));
2858 strbuf_release(&sb);
2859 }
2860 else {
2861 /* we can borrow from the file in the work tree */
2862 temp->name = name;
2863 if (!one->sha1_valid)
2864 strcpy(temp->hex, sha1_to_hex(null_sha1));
2865 else
2866 strcpy(temp->hex, sha1_to_hex(one->sha1));
2867 /* Even though we may sometimes borrow the
2868 * contents from the work tree, we always want
2869 * one->mode. mode is trustworthy even when
2870 * !(one->sha1_valid), as long as
2871 * DIFF_FILE_VALID(one).
2872 */
2873 sprintf(temp->mode, "%06o", one->mode);
2874 }
2875 return temp;
2876 }
2877 else {
2878 if (diff_populate_filespec(one, 0))
2879 die("cannot read data blob for %s", one->path);
2880 prep_temp_blob(name, temp, one->data, one->size,
2881 one->sha1, one->mode);
2882 }
2883 return temp;
2884 }
2885
2886 static void add_external_diff_name(struct argv_array *argv,
2887 const char *name,
2888 struct diff_filespec *df)
2889 {
2890 struct diff_tempfile *temp = prepare_temp_file(name, df);
2891 argv_array_push(argv, temp->name);
2892 argv_array_push(argv, temp->hex);
2893 argv_array_push(argv, temp->mode);
2894 }
2895
2896 /* An external diff command takes:
2897 *
2898 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2899 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2900 *
2901 */
2902 static void run_external_diff(const char *pgm,
2903 const char *name,
2904 const char *other,
2905 struct diff_filespec *one,
2906 struct diff_filespec *two,
2907 const char *xfrm_msg,
2908 int complete_rewrite,
2909 struct diff_options *o)
2910 {
2911 struct argv_array argv = ARGV_ARRAY_INIT;
2912 struct argv_array env = ARGV_ARRAY_INIT;
2913 struct diff_queue_struct *q = &diff_queued_diff;
2914
2915 argv_array_push(&argv, pgm);
2916 argv_array_push(&argv, name);
2917
2918 if (one && two) {
2919 add_external_diff_name(&argv, name, one);
2920 if (!other)
2921 add_external_diff_name(&argv, name, two);
2922 else {
2923 add_external_diff_name(&argv, other, two);
2924 argv_array_push(&argv, other);
2925 argv_array_push(&argv, xfrm_msg);
2926 }
2927 }
2928
2929 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
2930 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
2931
2932 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
2933 die(_("external diff died, stopping at %s"), name);
2934
2935 remove_tempfile();
2936 argv_array_clear(&argv);
2937 argv_array_clear(&env);
2938 }
2939
2940 static int similarity_index(struct diff_filepair *p)
2941 {
2942 return p->score * 100 / MAX_SCORE;
2943 }
2944
2945 static void fill_metainfo(struct strbuf *msg,
2946 const char *name,
2947 const char *other,
2948 struct diff_filespec *one,
2949 struct diff_filespec *two,
2950 struct diff_options *o,
2951 struct diff_filepair *p,
2952 int *must_show_header,
2953 int use_color)
2954 {
2955 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2956 const char *reset = diff_get_color(use_color, DIFF_RESET);
2957 const char *line_prefix = diff_line_prefix(o);
2958
2959 *must_show_header = 1;
2960 strbuf_init(msg, PATH_MAX * 2 + 300);
2961 switch (p->status) {
2962 case DIFF_STATUS_COPIED:
2963 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2964 line_prefix, set, similarity_index(p));
2965 strbuf_addf(msg, "%s\n%s%scopy from ",
2966 reset, line_prefix, set);
2967 quote_c_style(name, msg, NULL, 0);
2968 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2969 quote_c_style(other, msg, NULL, 0);
2970 strbuf_addf(msg, "%s\n", reset);
2971 break;
2972 case DIFF_STATUS_RENAMED:
2973 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2974 line_prefix, set, similarity_index(p));
2975 strbuf_addf(msg, "%s\n%s%srename from ",
2976 reset, line_prefix, set);
2977 quote_c_style(name, msg, NULL, 0);
2978 strbuf_addf(msg, "%s\n%s%srename to ",
2979 reset, line_prefix, set);
2980 quote_c_style(other, msg, NULL, 0);
2981 strbuf_addf(msg, "%s\n", reset);
2982 break;
2983 case DIFF_STATUS_MODIFIED:
2984 if (p->score) {
2985 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2986 line_prefix,
2987 set, similarity_index(p), reset);
2988 break;
2989 }
2990 /* fallthru */
2991 default:
2992 *must_show_header = 0;
2993 }
2994 if (one && two && hashcmp(one->sha1, two->sha1)) {
2995 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2996
2997 if (DIFF_OPT_TST(o, BINARY)) {
2998 mmfile_t mf;
2999 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3000 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3001 abbrev = 40;
3002 }
3003 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3004 find_unique_abbrev(one->sha1, abbrev));
3005 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3006 if (one->mode == two->mode)
3007 strbuf_addf(msg, " %06o", one->mode);
3008 strbuf_addf(msg, "%s\n", reset);
3009 }
3010 }
3011
3012 static void run_diff_cmd(const char *pgm,
3013 const char *name,
3014 const char *other,
3015 const char *attr_path,
3016 struct diff_filespec *one,
3017 struct diff_filespec *two,
3018 struct strbuf *msg,
3019 struct diff_options *o,
3020 struct diff_filepair *p)
3021 {
3022 const char *xfrm_msg = NULL;
3023 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3024 int must_show_header = 0;
3025
3026
3027 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3028 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3029 if (drv && drv->external)
3030 pgm = drv->external;
3031 }
3032
3033 if (msg) {
3034 /*
3035 * don't use colors when the header is intended for an
3036 * external diff driver
3037 */
3038 fill_metainfo(msg, name, other, one, two, o, p,
3039 &must_show_header,
3040 want_color(o->use_color) && !pgm);
3041 xfrm_msg = msg->len ? msg->buf : NULL;
3042 }
3043
3044 if (pgm) {
3045 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3046 complete_rewrite, o);
3047 return;
3048 }
3049 if (one && two)
3050 builtin_diff(name, other ? other : name,
3051 one, two, xfrm_msg, must_show_header,
3052 o, complete_rewrite);
3053 else
3054 fprintf(o->file, "* Unmerged path %s\n", name);
3055 }
3056
3057 static void diff_fill_sha1_info(struct diff_filespec *one)
3058 {
3059 if (DIFF_FILE_VALID(one)) {
3060 if (!one->sha1_valid) {
3061 struct stat st;
3062 if (one->is_stdin) {
3063 hashcpy(one->sha1, null_sha1);
3064 return;
3065 }
3066 if (lstat(one->path, &st) < 0)
3067 die_errno("stat '%s'", one->path);
3068 if (index_path(one->sha1, one->path, &st, 0))
3069 die("cannot hash %s", one->path);
3070 }
3071 }
3072 else
3073 hashclr(one->sha1);
3074 }
3075
3076 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3077 {
3078 /* Strip the prefix but do not molest /dev/null and absolute paths */
3079 if (*namep && **namep != '/') {
3080 *namep += prefix_length;
3081 if (**namep == '/')
3082 ++*namep;
3083 }
3084 if (*otherp && **otherp != '/') {
3085 *otherp += prefix_length;
3086 if (**otherp == '/')
3087 ++*otherp;
3088 }
3089 }
3090
3091 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3092 {
3093 const char *pgm = external_diff();
3094 struct strbuf msg;
3095 struct diff_filespec *one = p->one;
3096 struct diff_filespec *two = p->two;
3097 const char *name;
3098 const char *other;
3099 const char *attr_path;
3100
3101 name = p->one->path;
3102 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3103 attr_path = name;
3104 if (o->prefix_length)
3105 strip_prefix(o->prefix_length, &name, &other);
3106
3107 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3108 pgm = NULL;
3109
3110 if (DIFF_PAIR_UNMERGED(p)) {
3111 run_diff_cmd(pgm, name, NULL, attr_path,
3112 NULL, NULL, NULL, o, p);
3113 return;
3114 }
3115
3116 diff_fill_sha1_info(one);
3117 diff_fill_sha1_info(two);
3118
3119 if (!pgm &&
3120 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3121 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3122 /*
3123 * a filepair that changes between file and symlink
3124 * needs to be split into deletion and creation.
3125 */
3126 struct diff_filespec *null = alloc_filespec(two->path);
3127 run_diff_cmd(NULL, name, other, attr_path,
3128 one, null, &msg, o, p);
3129 free(null);
3130 strbuf_release(&msg);
3131
3132 null = alloc_filespec(one->path);
3133 run_diff_cmd(NULL, name, other, attr_path,
3134 null, two, &msg, o, p);
3135 free(null);
3136 }
3137 else
3138 run_diff_cmd(pgm, name, other, attr_path,
3139 one, two, &msg, o, p);
3140
3141 strbuf_release(&msg);
3142 }
3143
3144 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3145 struct diffstat_t *diffstat)
3146 {
3147 const char *name;
3148 const char *other;
3149
3150 if (DIFF_PAIR_UNMERGED(p)) {
3151 /* unmerged */
3152 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3153 return;
3154 }
3155
3156 name = p->one->path;
3157 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3158
3159 if (o->prefix_length)
3160 strip_prefix(o->prefix_length, &name, &other);
3161
3162 diff_fill_sha1_info(p->one);
3163 diff_fill_sha1_info(p->two);
3164
3165 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3166 }
3167
3168 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3169 {
3170 const char *name;
3171 const char *other;
3172 const char *attr_path;
3173
3174 if (DIFF_PAIR_UNMERGED(p)) {
3175 /* unmerged */
3176 return;
3177 }
3178
3179 name = p->one->path;
3180 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3181 attr_path = other ? other : name;
3182
3183 if (o->prefix_length)
3184 strip_prefix(o->prefix_length, &name, &other);
3185
3186 diff_fill_sha1_info(p->one);
3187 diff_fill_sha1_info(p->two);
3188
3189 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3190 }
3191
3192 void diff_setup(struct diff_options *options)
3193 {
3194 memcpy(options, &default_diff_options, sizeof(*options));
3195
3196 options->file = stdout;
3197
3198 options->line_termination = '\n';
3199 options->break_opt = -1;
3200 options->rename_limit = -1;
3201 options->dirstat_permille = diff_dirstat_permille_default;
3202 options->context = diff_context_default;
3203 DIFF_OPT_SET(options, RENAME_EMPTY);
3204
3205 /* pathchange left =NULL by default */
3206 options->change = diff_change;
3207 options->add_remove = diff_addremove;
3208 options->use_color = diff_use_color_default;
3209 options->detect_rename = diff_detect_rename_default;
3210 options->xdl_opts |= diff_algorithm;
3211
3212 options->orderfile = diff_order_file_cfg;
3213
3214 if (diff_no_prefix) {
3215 options->a_prefix = options->b_prefix = "";
3216 } else if (!diff_mnemonic_prefix) {
3217 options->a_prefix = "a/";
3218 options->b_prefix = "b/";
3219 }
3220 }
3221
3222 void diff_setup_done(struct diff_options *options)
3223 {
3224 int count = 0;
3225
3226 if (options->set_default)
3227 options->set_default(options);
3228
3229 if (options->output_format & DIFF_FORMAT_NAME)
3230 count++;
3231 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3232 count++;
3233 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3234 count++;
3235 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3236 count++;
3237 if (count > 1)
3238 die("--name-only, --name-status, --check and -s are mutually exclusive");
3239
3240 /*
3241 * Most of the time we can say "there are changes"
3242 * only by checking if there are changed paths, but
3243 * --ignore-whitespace* options force us to look
3244 * inside contents.
3245 */
3246
3247 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3248 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3249 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3250 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3251 else
3252 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3253
3254 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3255 options->detect_rename = DIFF_DETECT_COPY;
3256
3257 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3258 options->prefix = NULL;
3259 if (options->prefix)
3260 options->prefix_length = strlen(options->prefix);
3261 else
3262 options->prefix_length = 0;
3263
3264 if (options->output_format & (DIFF_FORMAT_NAME |
3265 DIFF_FORMAT_NAME_STATUS |
3266 DIFF_FORMAT_CHECKDIFF |
3267 DIFF_FORMAT_NO_OUTPUT))
3268 options->output_format &= ~(DIFF_FORMAT_RAW |
3269 DIFF_FORMAT_NUMSTAT |
3270 DIFF_FORMAT_DIFFSTAT |
3271 DIFF_FORMAT_SHORTSTAT |
3272 DIFF_FORMAT_DIRSTAT |
3273 DIFF_FORMAT_SUMMARY |
3274 DIFF_FORMAT_PATCH);
3275
3276 /*
3277 * These cases always need recursive; we do not drop caller-supplied
3278 * recursive bits for other formats here.
3279 */
3280 if (options->output_format & (DIFF_FORMAT_PATCH |
3281 DIFF_FORMAT_NUMSTAT |
3282 DIFF_FORMAT_DIFFSTAT |
3283 DIFF_FORMAT_SHORTSTAT |
3284 DIFF_FORMAT_DIRSTAT |
3285 DIFF_FORMAT_SUMMARY |
3286 DIFF_FORMAT_CHECKDIFF))
3287 DIFF_OPT_SET(options, RECURSIVE);
3288 /*
3289 * Also pickaxe would not work very well if you do not say recursive
3290 */
3291 if (options->pickaxe)
3292 DIFF_OPT_SET(options, RECURSIVE);
3293 /*
3294 * When patches are generated, submodules diffed against the work tree
3295 * must be checked for dirtiness too so it can be shown in the output
3296 */
3297 if (options->output_format & DIFF_FORMAT_PATCH)
3298 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3299
3300 if (options->detect_rename && options->rename_limit < 0)
3301 options->rename_limit = diff_rename_limit_default;
3302 if (options->setup & DIFF_SETUP_USE_CACHE) {
3303 if (!active_cache)
3304 /* read-cache does not die even when it fails
3305 * so it is safe for us to do this here. Also
3306 * it does not smudge active_cache or active_nr
3307 * when it fails, so we do not have to worry about
3308 * cleaning it up ourselves either.
3309 */
3310 read_cache();
3311 }
3312 if (options->abbrev <= 0 || 40 < options->abbrev)
3313 options->abbrev = 40; /* full */
3314
3315 /*
3316 * It does not make sense to show the first hit we happened
3317 * to have found. It does not make sense not to return with
3318 * exit code in such a case either.
3319 */
3320 if (DIFF_OPT_TST(options, QUICK)) {
3321 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3322 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3323 }
3324
3325 options->diff_path_counter = 0;
3326
3327 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3328 die(_("--follow requires exactly one pathspec"));
3329 }
3330
3331 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3332 {
3333 char c, *eq;
3334 int len;
3335
3336 if (*arg != '-')
3337 return 0;
3338 c = *++arg;
3339 if (!c)
3340 return 0;
3341 if (c == arg_short) {
3342 c = *++arg;
3343 if (!c)
3344 return 1;
3345 if (val && isdigit(c)) {
3346 char *end;
3347 int n = strtoul(arg, &end, 10);
3348 if (*end)
3349 return 0;
3350 *val = n;
3351 return 1;
3352 }
3353 return 0;
3354 }
3355 if (c != '-')
3356 return 0;
3357 arg++;
3358 eq = strchrnul(arg, '=');
3359 len = eq - arg;
3360 if (!len || strncmp(arg, arg_long, len))
3361 return 0;
3362 if (*eq) {
3363 int n;
3364 char *end;
3365 if (!isdigit(*++eq))
3366 return 0;
3367 n = strtoul(eq, &end, 10);
3368 if (*end)
3369 return 0;
3370 *val = n;
3371 }
3372 return 1;
3373 }
3374
3375 static int diff_scoreopt_parse(const char *opt);
3376
3377 static inline int short_opt(char opt, const char **argv,
3378 const char **optarg)
3379 {
3380 const char *arg = argv[0];
3381 if (arg[0] != '-' || arg[1] != opt)
3382 return 0;
3383 if (arg[2] != '\0') {
3384 *optarg = arg + 2;
3385 return 1;
3386 }
3387 if (!argv[1])
3388 die("Option '%c' requires a value", opt);
3389 *optarg = argv[1];
3390 return 2;
3391 }
3392
3393 int parse_long_opt(const char *opt, const char **argv,
3394 const char **optarg)
3395 {
3396 const char *arg = argv[0];
3397 if (!skip_prefix(arg, "--", &arg))
3398 return 0;
3399 if (!skip_prefix(arg, opt, &arg))
3400 return 0;
3401 if (*arg == '=') { /* stuck form: --option=value */
3402 *optarg = arg + 1;
3403 return 1;
3404 }
3405 if (*arg != '\0')
3406 return 0;
3407 /* separate form: --option value */
3408 if (!argv[1])
3409 die("Option '--%s' requires a value", opt);
3410 *optarg = argv[1];
3411 return 2;
3412 }
3413
3414 static int stat_opt(struct diff_options *options, const char **av)
3415 {
3416 const char *arg = av[0];
3417 char *end;
3418 int width = options->stat_width;
3419 int name_width = options->stat_name_width;
3420 int graph_width = options->stat_graph_width;
3421 int count = options->stat_count;
3422 int argcount = 1;
3423
3424 if (!skip_prefix(arg, "--stat", &arg))
3425 die("BUG: stat option does not begin with --stat: %s", arg);
3426 end = (char *)arg;
3427
3428 switch (*arg) {
3429 case '-':
3430 if (skip_prefix(arg, "-width", &arg)) {
3431 if (*arg == '=')
3432 width = strtoul(arg + 1, &end, 10);
3433 else if (!*arg && !av[1])
3434 die("Option '--stat-width' requires a value");
3435 else if (!*arg) {
3436 width = strtoul(av[1], &end, 10);
3437 argcount = 2;
3438 }
3439 } else if (skip_prefix(arg, "-name-width", &arg)) {
3440 if (*arg == '=')
3441 name_width = strtoul(arg + 1, &end, 10);
3442 else if (!*arg && !av[1])
3443 die("Option '--stat-name-width' requires a value");
3444 else if (!*arg) {
3445 name_width = strtoul(av[1], &end, 10);
3446 argcount = 2;
3447 }
3448 } else if (skip_prefix(arg, "-graph-width", &arg)) {
3449 if (*arg == '=')
3450 graph_width = strtoul(arg + 1, &end, 10);
3451 else if (!*arg && !av[1])
3452 die("Option '--stat-graph-width' requires a value");
3453 else if (!*arg) {
3454 graph_width = strtoul(av[1], &end, 10);
3455 argcount = 2;
3456 }
3457 } else if (skip_prefix(arg, "-count", &arg)) {
3458 if (*arg == '=')
3459 count = strtoul(arg + 1, &end, 10);
3460 else if (!*arg && !av[1])
3461 die("Option '--stat-count' requires a value");
3462 else if (!*arg) {
3463 count = strtoul(av[1], &end, 10);
3464 argcount = 2;
3465 }
3466 }
3467 break;
3468 case '=':
3469 width = strtoul(arg+1, &end, 10);
3470 if (*end == ',')
3471 name_width = strtoul(end+1, &end, 10);
3472 if (*end == ',')
3473 count = strtoul(end+1, &end, 10);
3474 }
3475
3476 /* Important! This checks all the error cases! */
3477 if (*end)
3478 return 0;
3479 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3480 options->stat_name_width = name_width;
3481 options->stat_graph_width = graph_width;
3482 options->stat_width = width;
3483 options->stat_count = count;
3484 return argcount;
3485 }
3486
3487 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3488 {
3489 struct strbuf errmsg = STRBUF_INIT;
3490 if (parse_dirstat_params(options, params, &errmsg))
3491 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3492 errmsg.buf);
3493 strbuf_release(&errmsg);
3494 /*
3495 * The caller knows a dirstat-related option is given from the command
3496 * line; allow it to say "return this_function();"
3497 */
3498 options->output_format |= DIFF_FORMAT_DIRSTAT;
3499 return 1;
3500 }
3501
3502 static int parse_submodule_opt(struct diff_options *options, const char *value)
3503 {
3504 if (parse_submodule_params(options, value))
3505 die(_("Failed to parse --submodule option parameter: '%s'"),
3506 value);
3507 return 1;
3508 }
3509
3510 static const char diff_status_letters[] = {
3511 DIFF_STATUS_ADDED,
3512 DIFF_STATUS_COPIED,
3513 DIFF_STATUS_DELETED,
3514 DIFF_STATUS_MODIFIED,
3515 DIFF_STATUS_RENAMED,
3516 DIFF_STATUS_TYPE_CHANGED,
3517 DIFF_STATUS_UNKNOWN,
3518 DIFF_STATUS_UNMERGED,
3519 DIFF_STATUS_FILTER_AON,
3520 DIFF_STATUS_FILTER_BROKEN,
3521 '\0',
3522 };
3523
3524 static unsigned int filter_bit['Z' + 1];
3525
3526 static void prepare_filter_bits(void)
3527 {
3528 int i;
3529
3530 if (!filter_bit[DIFF_STATUS_ADDED]) {
3531 for (i = 0; diff_status_letters[i]; i++)
3532 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3533 }
3534 }
3535
3536 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3537 {
3538 return opt->filter & filter_bit[(int) status];
3539 }
3540
3541 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3542 {
3543 int i, optch;
3544
3545 prepare_filter_bits();
3546
3547 /*
3548 * If there is a negation e.g. 'd' in the input, and we haven't
3549 * initialized the filter field with another --diff-filter, start
3550 * from full set of bits, except for AON.
3551 */
3552 if (!opt->filter) {
3553 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3554 if (optch < 'a' || 'z' < optch)
3555 continue;
3556 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3557 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3558 break;
3559 }
3560 }
3561
3562 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3563 unsigned int bit;
3564 int negate;
3565
3566 if ('a' <= optch && optch <= 'z') {
3567 negate = 1;
3568 optch = toupper(optch);
3569 } else {
3570 negate = 0;
3571 }
3572
3573 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3574 if (!bit)
3575 return optarg[i];
3576 if (negate)
3577 opt->filter &= ~bit;
3578 else
3579 opt->filter |= bit;
3580 }
3581 return 0;
3582 }
3583
3584 static void enable_patch_output(int *fmt) {
3585 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3586 *fmt |= DIFF_FORMAT_PATCH;
3587 }
3588
3589 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3590 {
3591 const char *arg = av[0];
3592 const char *optarg;
3593 int argcount;
3594
3595 /* Output format options */
3596 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3597 || opt_arg(arg, 'U', "unified", &options->context))
3598 enable_patch_output(&options->output_format);
3599 else if (!strcmp(arg, "--raw"))
3600 options->output_format |= DIFF_FORMAT_RAW;
3601 else if (!strcmp(arg, "--patch-with-raw")) {
3602 enable_patch_output(&options->output_format);
3603 options->output_format |= DIFF_FORMAT_RAW;
3604 } else if (!strcmp(arg, "--numstat"))
3605 options->output_format |= DIFF_FORMAT_NUMSTAT;
3606 else if (!strcmp(arg, "--shortstat"))
3607 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3608 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3609 return parse_dirstat_opt(options, "");
3610 else if (skip_prefix(arg, "-X", &arg))
3611 return parse_dirstat_opt(options, arg);
3612 else if (skip_prefix(arg, "--dirstat=", &arg))
3613 return parse_dirstat_opt(options, arg);
3614 else if (!strcmp(arg, "--cumulative"))
3615 return parse_dirstat_opt(options, "cumulative");
3616 else if (!strcmp(arg, "--dirstat-by-file"))
3617 return parse_dirstat_opt(options, "files");
3618 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
3619 parse_dirstat_opt(options, "files");
3620 return parse_dirstat_opt(options, arg);
3621 }
3622 else if (!strcmp(arg, "--check"))
3623 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3624 else if (!strcmp(arg, "--summary"))
3625 options->output_format |= DIFF_FORMAT_SUMMARY;
3626 else if (!strcmp(arg, "--patch-with-stat")) {
3627 enable_patch_output(&options->output_format);
3628 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3629 } else if (!strcmp(arg, "--name-only"))
3630 options->output_format |= DIFF_FORMAT_NAME;
3631 else if (!strcmp(arg, "--name-status"))
3632 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3633 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3634 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3635 else if (starts_with(arg, "--stat"))
3636 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3637 return stat_opt(options, av);
3638
3639 /* renames options */
3640 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3641 !strcmp(arg, "--break-rewrites")) {
3642 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3643 return error("invalid argument to -B: %s", arg+2);
3644 }
3645 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3646 !strcmp(arg, "--find-renames")) {
3647 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3648 return error("invalid argument to -M: %s", arg+2);
3649 options->detect_rename = DIFF_DETECT_RENAME;
3650 }
3651 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3652 options->irreversible_delete = 1;
3653 }
3654 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3655 !strcmp(arg, "--find-copies")) {
3656 if (options->detect_rename == DIFF_DETECT_COPY)
3657 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3658 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3659 return error("invalid argument to -C: %s", arg+2);
3660 options->detect_rename = DIFF_DETECT_COPY;
3661 }
3662 else if (!strcmp(arg, "--no-renames"))
3663 options->detect_rename = 0;
3664 else if (!strcmp(arg, "--rename-empty"))
3665 DIFF_OPT_SET(options, RENAME_EMPTY);
3666 else if (!strcmp(arg, "--no-rename-empty"))
3667 DIFF_OPT_CLR(options, RENAME_EMPTY);
3668 else if (!strcmp(arg, "--relative"))
3669 DIFF_OPT_SET(options, RELATIVE_NAME);
3670 else if (skip_prefix(arg, "--relative=", &arg)) {
3671 DIFF_OPT_SET(options, RELATIVE_NAME);
3672 options->prefix = arg;
3673 }
3674
3675 /* xdiff options */
3676 else if (!strcmp(arg, "--minimal"))
3677 DIFF_XDL_SET(options, NEED_MINIMAL);
3678 else if (!strcmp(arg, "--no-minimal"))
3679 DIFF_XDL_CLR(options, NEED_MINIMAL);
3680 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3681 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3682 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3683 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3684 else if (!strcmp(arg, "--ignore-space-at-eol"))
3685 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3686 else if (!strcmp(arg, "--ignore-blank-lines"))
3687 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3688 else if (!strcmp(arg, "--patience"))
3689 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3690 else if (!strcmp(arg, "--histogram"))
3691 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3692 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3693 long value = parse_algorithm_value(optarg);
3694 if (value < 0)
3695 return error("option diff-algorithm accepts \"myers\", "
3696 "\"minimal\", \"patience\" and \"histogram\"");
3697 /* clear out previous settings */
3698 DIFF_XDL_CLR(options, NEED_MINIMAL);
3699 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3700 options->xdl_opts |= value;
3701 return argcount;
3702 }
3703
3704 /* flags options */
3705 else if (!strcmp(arg, "--binary")) {
3706 enable_patch_output(&options->output_format);
3707 DIFF_OPT_SET(options, BINARY);
3708 }
3709 else if (!strcmp(arg, "--full-index"))
3710 DIFF_OPT_SET(options, FULL_INDEX);
3711 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3712 DIFF_OPT_SET(options, TEXT);
3713 else if (!strcmp(arg, "-R"))
3714 DIFF_OPT_SET(options, REVERSE_DIFF);
3715 else if (!strcmp(arg, "--find-copies-harder"))
3716 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3717 else if (!strcmp(arg, "--follow"))
3718 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3719 else if (!strcmp(arg, "--no-follow"))
3720 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3721 else if (!strcmp(arg, "--color"))
3722 options->use_color = 1;
3723 else if (skip_prefix(arg, "--color=", &arg)) {
3724 int value = git_config_colorbool(NULL, arg);
3725 if (value < 0)
3726 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3727 options->use_color = value;
3728 }
3729 else if (!strcmp(arg, "--no-color"))
3730 options->use_color = 0;
3731 else if (!strcmp(arg, "--color-words")) {
3732 options->use_color = 1;
3733 options->word_diff = DIFF_WORDS_COLOR;
3734 }
3735 else if (skip_prefix(arg, "--color-words=", &arg)) {
3736 options->use_color = 1;
3737 options->word_diff = DIFF_WORDS_COLOR;
3738 options->word_regex = arg;
3739 }
3740 else if (!strcmp(arg, "--word-diff")) {
3741 if (options->word_diff == DIFF_WORDS_NONE)
3742 options->word_diff = DIFF_WORDS_PLAIN;
3743 }
3744 else if (skip_prefix(arg, "--word-diff=", &arg)) {
3745 if (!strcmp(arg, "plain"))
3746 options->word_diff = DIFF_WORDS_PLAIN;
3747 else if (!strcmp(arg, "color")) {
3748 options->use_color = 1;
3749 options->word_diff = DIFF_WORDS_COLOR;
3750 }
3751 else if (!strcmp(arg, "porcelain"))
3752 options->word_diff = DIFF_WORDS_PORCELAIN;
3753 else if (!strcmp(arg, "none"))
3754 options->word_diff = DIFF_WORDS_NONE;
3755 else
3756 die("bad --word-diff argument: %s", arg);
3757 }
3758 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3759 if (options->word_diff == DIFF_WORDS_NONE)
3760 options->word_diff = DIFF_WORDS_PLAIN;
3761 options->word_regex = optarg;
3762 return argcount;
3763 }
3764 else if (!strcmp(arg, "--exit-code"))
3765 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3766 else if (!strcmp(arg, "--quiet"))
3767 DIFF_OPT_SET(options, QUICK);
3768 else if (!strcmp(arg, "--ext-diff"))
3769 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3770 else if (!strcmp(arg, "--no-ext-diff"))
3771 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3772 else if (!strcmp(arg, "--textconv"))
3773 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3774 else if (!strcmp(arg, "--no-textconv"))
3775 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3776 else if (!strcmp(arg, "--ignore-submodules")) {
3777 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3778 handle_ignore_submodules_arg(options, "all");
3779 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
3780 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3781 handle_ignore_submodules_arg(options, arg);
3782 } else if (!strcmp(arg, "--submodule"))
3783 DIFF_OPT_SET(options, SUBMODULE_LOG);
3784 else if (skip_prefix(arg, "--submodule=", &arg))
3785 return parse_submodule_opt(options, arg);
3786
3787 /* misc options */
3788 else if (!strcmp(arg, "-z"))
3789 options->line_termination = 0;
3790 else if ((argcount = short_opt('l', av, &optarg))) {
3791 options->rename_limit = strtoul(optarg, NULL, 10);
3792 return argcount;
3793 }
3794 else if ((argcount = short_opt('S', av, &optarg))) {
3795 options->pickaxe = optarg;
3796 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3797 return argcount;
3798 } else if ((argcount = short_opt('G', av, &optarg))) {
3799 options->pickaxe = optarg;
3800 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3801 return argcount;
3802 }
3803 else if (!strcmp(arg, "--pickaxe-all"))
3804 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3805 else if (!strcmp(arg, "--pickaxe-regex"))
3806 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3807 else if ((argcount = short_opt('O', av, &optarg))) {
3808 options->orderfile = optarg;
3809 return argcount;
3810 }
3811 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3812 int offending = parse_diff_filter_opt(optarg, options);
3813 if (offending)
3814 die("unknown change class '%c' in --diff-filter=%s",
3815 offending, optarg);
3816 return argcount;
3817 }
3818 else if (!strcmp(arg, "--abbrev"))
3819 options->abbrev = DEFAULT_ABBREV;
3820 else if (skip_prefix(arg, "--abbrev=", &arg)) {
3821 options->abbrev = strtoul(arg, NULL, 10);
3822 if (options->abbrev < MINIMUM_ABBREV)
3823 options->abbrev = MINIMUM_ABBREV;
3824 else if (40 < options->abbrev)
3825 options->abbrev = 40;
3826 }
3827 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3828 options->a_prefix = optarg;
3829 return argcount;
3830 }
3831 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3832 options->b_prefix = optarg;
3833 return argcount;
3834 }
3835 else if (!strcmp(arg, "--no-prefix"))
3836 options->a_prefix = options->b_prefix = "";
3837 else if (opt_arg(arg, '\0', "inter-hunk-context",
3838 &options->interhunkcontext))
3839 ;
3840 else if (!strcmp(arg, "-W"))
3841 DIFF_OPT_SET(options, FUNCCONTEXT);
3842 else if (!strcmp(arg, "--function-context"))
3843 DIFF_OPT_SET(options, FUNCCONTEXT);
3844 else if (!strcmp(arg, "--no-function-context"))
3845 DIFF_OPT_CLR(options, FUNCCONTEXT);
3846 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3847 options->file = fopen(optarg, "w");
3848 if (!options->file)
3849 die_errno("Could not open '%s'", optarg);
3850 options->close_file = 1;
3851 return argcount;
3852 } else
3853 return 0;
3854 return 1;
3855 }
3856
3857 int parse_rename_score(const char **cp_p)
3858 {
3859 unsigned long num, scale;
3860 int ch, dot;
3861 const char *cp = *cp_p;
3862
3863 num = 0;
3864 scale = 1;
3865 dot = 0;
3866 for (;;) {
3867 ch = *cp;
3868 if ( !dot && ch == '.' ) {
3869 scale = 1;
3870 dot = 1;
3871 } else if ( ch == '%' ) {
3872 scale = dot ? scale*100 : 100;
3873 cp++; /* % is always at the end */
3874 break;
3875 } else if ( ch >= '0' && ch <= '9' ) {
3876 if ( scale < 100000 ) {
3877 scale *= 10;
3878 num = (num*10) + (ch-'0');
3879 }
3880 } else {
3881 break;
3882 }
3883 cp++;
3884 }
3885 *cp_p = cp;
3886
3887 /* user says num divided by scale and we say internally that
3888 * is MAX_SCORE * num / scale.
3889 */
3890 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3891 }
3892
3893 static int diff_scoreopt_parse(const char *opt)
3894 {
3895 int opt1, opt2, cmd;
3896
3897 if (*opt++ != '-')
3898 return -1;
3899 cmd = *opt++;
3900 if (cmd == '-') {
3901 /* convert the long-form arguments into short-form versions */
3902 if (skip_prefix(opt, "break-rewrites", &opt)) {
3903 if (*opt == 0 || *opt++ == '=')
3904 cmd = 'B';
3905 } else if (skip_prefix(opt, "find-copies", &opt)) {
3906 if (*opt == 0 || *opt++ == '=')
3907 cmd = 'C';
3908 } else if (skip_prefix(opt, "find-renames", &opt)) {
3909 if (*opt == 0 || *opt++ == '=')
3910 cmd = 'M';
3911 }
3912 }
3913 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3914 return -1; /* that is not a -M, -C, or -B option */
3915
3916 opt1 = parse_rename_score(&opt);
3917 if (cmd != 'B')
3918 opt2 = 0;
3919 else {
3920 if (*opt == 0)
3921 opt2 = 0;
3922 else if (*opt != '/')
3923 return -1; /* we expect -B80/99 or -B80 */
3924 else {
3925 opt++;
3926 opt2 = parse_rename_score(&opt);
3927 }
3928 }
3929 if (*opt != 0)
3930 return -1;
3931 return opt1 | (opt2 << 16);
3932 }
3933
3934 struct diff_queue_struct diff_queued_diff;
3935
3936 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3937 {
3938 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
3939 queue->queue[queue->nr++] = dp;
3940 }
3941
3942 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3943 struct diff_filespec *one,
3944 struct diff_filespec *two)
3945 {
3946 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3947 dp->one = one;
3948 dp->two = two;
3949 if (queue)
3950 diff_q(queue, dp);
3951 return dp;
3952 }
3953
3954 void diff_free_filepair(struct diff_filepair *p)
3955 {
3956 free_filespec(p->one);
3957 free_filespec(p->two);
3958 free(p);
3959 }
3960
3961 /* This is different from find_unique_abbrev() in that
3962 * it stuffs the result with dots for alignment.
3963 */
3964 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3965 {
3966 int abblen;
3967 const char *abbrev;
3968 if (len == 40)
3969 return sha1_to_hex(sha1);
3970
3971 abbrev = find_unique_abbrev(sha1, len);
3972 abblen = strlen(abbrev);
3973 if (abblen < 37) {
3974 static char hex[41];
3975 if (len < abblen && abblen <= len + 2)
3976 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3977 else
3978 sprintf(hex, "%s...", abbrev);
3979 return hex;
3980 }
3981 return sha1_to_hex(sha1);
3982 }
3983
3984 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3985 {
3986 int line_termination = opt->line_termination;
3987 int inter_name_termination = line_termination ? '\t' : '\0';
3988
3989 fprintf(opt->file, "%s", diff_line_prefix(opt));
3990 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3991 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3992 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3993 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3994 }
3995 if (p->score) {
3996 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3997 inter_name_termination);
3998 } else {
3999 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4000 }
4001
4002 if (p->status == DIFF_STATUS_COPIED ||
4003 p->status == DIFF_STATUS_RENAMED) {
4004 const char *name_a, *name_b;
4005 name_a = p->one->path;
4006 name_b = p->two->path;
4007 strip_prefix(opt->prefix_length, &name_a, &name_b);
4008 write_name_quoted(name_a, opt->file, inter_name_termination);
4009 write_name_quoted(name_b, opt->file, line_termination);
4010 } else {
4011 const char *name_a, *name_b;
4012 name_a = p->one->mode ? p->one->path : p->two->path;
4013 name_b = NULL;
4014 strip_prefix(opt->prefix_length, &name_a, &name_b);
4015 write_name_quoted(name_a, opt->file, line_termination);
4016 }
4017 }
4018
4019 int diff_unmodified_pair(struct diff_filepair *p)
4020 {
4021 /* This function is written stricter than necessary to support
4022 * the currently implemented transformers, but the idea is to
4023 * let transformers to produce diff_filepairs any way they want,
4024 * and filter and clean them up here before producing the output.
4025 */
4026 struct diff_filespec *one = p->one, *two = p->two;
4027
4028 if (DIFF_PAIR_UNMERGED(p))
4029 return 0; /* unmerged is interesting */
4030
4031 /* deletion, addition, mode or type change
4032 * and rename are all interesting.
4033 */
4034 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4035 DIFF_PAIR_MODE_CHANGED(p) ||
4036 strcmp(one->path, two->path))
4037 return 0;
4038
4039 /* both are valid and point at the same path. that is, we are
4040 * dealing with a change.
4041 */
4042 if (one->sha1_valid && two->sha1_valid &&
4043 !hashcmp(one->sha1, two->sha1) &&
4044 !one->dirty_submodule && !two->dirty_submodule)
4045 return 1; /* no change */
4046 if (!one->sha1_valid && !two->sha1_valid)
4047 return 1; /* both look at the same file on the filesystem. */
4048 return 0;
4049 }
4050
4051 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4052 {
4053 if (diff_unmodified_pair(p))
4054 return;
4055
4056 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4057 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4058 return; /* no tree diffs in patch format */
4059
4060 run_diff(p, o);
4061 }
4062
4063 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4064 struct diffstat_t *diffstat)
4065 {
4066 if (diff_unmodified_pair(p))
4067 return;
4068
4069 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4070 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4071 return; /* no useful stat for tree diffs */
4072
4073 run_diffstat(p, o, diffstat);
4074 }
4075
4076 static void diff_flush_checkdiff(struct diff_filepair *p,
4077 struct diff_options *o)
4078 {
4079 if (diff_unmodified_pair(p))
4080 return;
4081
4082 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4083 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4084 return; /* nothing to check in tree diffs */
4085
4086 run_checkdiff(p, o);
4087 }
4088
4089 int diff_queue_is_empty(void)
4090 {
4091 struct diff_queue_struct *q = &diff_queued_diff;
4092 int i;
4093 for (i = 0; i < q->nr; i++)
4094 if (!diff_unmodified_pair(q->queue[i]))
4095 return 0;
4096 return 1;
4097 }
4098
4099 #if DIFF_DEBUG
4100 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4101 {
4102 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4103 x, one ? one : "",
4104 s->path,
4105 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4106 s->mode,
4107 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4108 fprintf(stderr, "queue[%d] %s size %lu\n",
4109 x, one ? one : "",
4110 s->size);
4111 }
4112
4113 void diff_debug_filepair(const struct diff_filepair *p, int i)
4114 {
4115 diff_debug_filespec(p->one, i, "one");
4116 diff_debug_filespec(p->two, i, "two");
4117 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4118 p->score, p->status ? p->status : '?',
4119 p->one->rename_used, p->broken_pair);
4120 }
4121
4122 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4123 {
4124 int i;
4125 if (msg)
4126 fprintf(stderr, "%s\n", msg);
4127 fprintf(stderr, "q->nr = %d\n", q->nr);
4128 for (i = 0; i < q->nr; i++) {
4129 struct diff_filepair *p = q->queue[i];
4130 diff_debug_filepair(p, i);
4131 }
4132 }
4133 #endif
4134
4135 static void diff_resolve_rename_copy(void)
4136 {
4137 int i;
4138 struct diff_filepair *p;
4139 struct diff_queue_struct *q = &diff_queued_diff;
4140
4141 diff_debug_queue("resolve-rename-copy", q);
4142
4143 for (i = 0; i < q->nr; i++) {
4144 p = q->queue[i];
4145 p->status = 0; /* undecided */
4146 if (DIFF_PAIR_UNMERGED(p))
4147 p->status = DIFF_STATUS_UNMERGED;
4148 else if (!DIFF_FILE_VALID(p->one))
4149 p->status = DIFF_STATUS_ADDED;
4150 else if (!DIFF_FILE_VALID(p->two))
4151 p->status = DIFF_STATUS_DELETED;
4152 else if (DIFF_PAIR_TYPE_CHANGED(p))
4153 p->status = DIFF_STATUS_TYPE_CHANGED;
4154
4155 /* from this point on, we are dealing with a pair
4156 * whose both sides are valid and of the same type, i.e.
4157 * either in-place edit or rename/copy edit.
4158 */
4159 else if (DIFF_PAIR_RENAME(p)) {
4160 /*
4161 * A rename might have re-connected a broken
4162 * pair up, causing the pathnames to be the
4163 * same again. If so, that's not a rename at
4164 * all, just a modification..
4165 *
4166 * Otherwise, see if this source was used for
4167 * multiple renames, in which case we decrement
4168 * the count, and call it a copy.
4169 */
4170 if (!strcmp(p->one->path, p->two->path))
4171 p->status = DIFF_STATUS_MODIFIED;
4172 else if (--p->one->rename_used > 0)
4173 p->status = DIFF_STATUS_COPIED;
4174 else
4175 p->status = DIFF_STATUS_RENAMED;
4176 }
4177 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4178 p->one->mode != p->two->mode ||
4179 p->one->dirty_submodule ||
4180 p->two->dirty_submodule ||
4181 is_null_sha1(p->one->sha1))
4182 p->status = DIFF_STATUS_MODIFIED;
4183 else {
4184 /* This is a "no-change" entry and should not
4185 * happen anymore, but prepare for broken callers.
4186 */
4187 error("feeding unmodified %s to diffcore",
4188 p->one->path);
4189 p->status = DIFF_STATUS_UNKNOWN;
4190 }
4191 }
4192 diff_debug_queue("resolve-rename-copy done", q);
4193 }
4194
4195 static int check_pair_status(struct diff_filepair *p)
4196 {
4197 switch (p->status) {
4198 case DIFF_STATUS_UNKNOWN:
4199 return 0;
4200 case 0:
4201 die("internal error in diff-resolve-rename-copy");
4202 default:
4203 return 1;
4204 }
4205 }
4206
4207 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4208 {
4209 int fmt = opt->output_format;
4210
4211 if (fmt & DIFF_FORMAT_CHECKDIFF)
4212 diff_flush_checkdiff(p, opt);
4213 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4214 diff_flush_raw(p, opt);
4215 else if (fmt & DIFF_FORMAT_NAME) {
4216 const char *name_a, *name_b;
4217 name_a = p->two->path;
4218 name_b = NULL;
4219 strip_prefix(opt->prefix_length, &name_a, &name_b);
4220 write_name_quoted(name_a, opt->file, opt->line_termination);
4221 }
4222 }
4223
4224 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4225 {
4226 if (fs->mode)
4227 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4228 else
4229 fprintf(file, " %s ", newdelete);
4230 write_name_quoted(fs->path, file, '\n');
4231 }
4232
4233
4234 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4235 const char *line_prefix)
4236 {
4237 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4238 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4239 p->two->mode, show_name ? ' ' : '\n');
4240 if (show_name) {
4241 write_name_quoted(p->two->path, file, '\n');
4242 }
4243 }
4244 }
4245
4246 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4247 const char *line_prefix)
4248 {
4249 char *names = pprint_rename(p->one->path, p->two->path);
4250
4251 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4252 free(names);
4253 show_mode_change(file, p, 0, line_prefix);
4254 }
4255
4256 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4257 {
4258 FILE *file = opt->file;
4259 const char *line_prefix = diff_line_prefix(opt);
4260
4261 switch(p->status) {
4262 case DIFF_STATUS_DELETED:
4263 fputs(line_prefix, file);
4264 show_file_mode_name(file, "delete", p->one);
4265 break;
4266 case DIFF_STATUS_ADDED:
4267 fputs(line_prefix, file);
4268 show_file_mode_name(file, "create", p->two);
4269 break;
4270 case DIFF_STATUS_COPIED:
4271 fputs(line_prefix, file);
4272 show_rename_copy(file, "copy", p, line_prefix);
4273 break;
4274 case DIFF_STATUS_RENAMED:
4275 fputs(line_prefix, file);
4276 show_rename_copy(file, "rename", p, line_prefix);
4277 break;
4278 default:
4279 if (p->score) {
4280 fprintf(file, "%s rewrite ", line_prefix);
4281 write_name_quoted(p->two->path, file, ' ');
4282 fprintf(file, "(%d%%)\n", similarity_index(p));
4283 }
4284 show_mode_change(file, p, !p->score, line_prefix);
4285 break;
4286 }
4287 }
4288
4289 struct patch_id_t {
4290 git_SHA_CTX *ctx;
4291 int patchlen;
4292 };
4293
4294 static int remove_space(char *line, int len)
4295 {
4296 int i;
4297 char *dst = line;
4298 unsigned char c;
4299
4300 for (i = 0; i < len; i++)
4301 if (!isspace((c = line[i])))
4302 *dst++ = c;
4303
4304 return dst - line;
4305 }
4306
4307 static void patch_id_consume(void *priv, char *line, unsigned long len)
4308 {
4309 struct patch_id_t *data = priv;
4310 int new_len;
4311
4312 /* Ignore line numbers when computing the SHA1 of the patch */
4313 if (starts_with(line, "@@ -"))
4314 return;
4315
4316 new_len = remove_space(line, len);
4317
4318 git_SHA1_Update(data->ctx, line, new_len);
4319 data->patchlen += new_len;
4320 }
4321
4322 /* returns 0 upon success, and writes result into sha1 */
4323 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4324 {
4325 struct diff_queue_struct *q = &diff_queued_diff;
4326 int i;
4327 git_SHA_CTX ctx;
4328 struct patch_id_t data;
4329 char buffer[PATH_MAX * 4 + 20];
4330
4331 git_SHA1_Init(&ctx);
4332 memset(&data, 0, sizeof(struct patch_id_t));
4333 data.ctx = &ctx;
4334
4335 for (i = 0; i < q->nr; i++) {
4336 xpparam_t xpp;
4337 xdemitconf_t xecfg;
4338 mmfile_t mf1, mf2;
4339 struct diff_filepair *p = q->queue[i];
4340 int len1, len2;
4341
4342 memset(&xpp, 0, sizeof(xpp));
4343 memset(&xecfg, 0, sizeof(xecfg));
4344 if (p->status == 0)
4345 return error("internal diff status error");
4346 if (p->status == DIFF_STATUS_UNKNOWN)
4347 continue;
4348 if (diff_unmodified_pair(p))
4349 continue;
4350 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4351 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4352 continue;
4353 if (DIFF_PAIR_UNMERGED(p))
4354 continue;
4355
4356 diff_fill_sha1_info(p->one);
4357 diff_fill_sha1_info(p->two);
4358 if (fill_mmfile(&mf1, p->one) < 0 ||
4359 fill_mmfile(&mf2, p->two) < 0)
4360 return error("unable to read files to diff");
4361
4362 len1 = remove_space(p->one->path, strlen(p->one->path));
4363 len2 = remove_space(p->two->path, strlen(p->two->path));
4364 if (p->one->mode == 0)
4365 len1 = snprintf(buffer, sizeof(buffer),
4366 "diff--gita/%.*sb/%.*s"
4367 "newfilemode%06o"
4368 "---/dev/null"
4369 "+++b/%.*s",
4370 len1, p->one->path,
4371 len2, p->two->path,
4372 p->two->mode,
4373 len2, p->two->path);
4374 else if (p->two->mode == 0)
4375 len1 = snprintf(buffer, sizeof(buffer),
4376 "diff--gita/%.*sb/%.*s"
4377 "deletedfilemode%06o"
4378 "---a/%.*s"
4379 "+++/dev/null",
4380 len1, p->one->path,
4381 len2, p->two->path,
4382 p->one->mode,
4383 len1, p->one->path);
4384 else
4385 len1 = snprintf(buffer, sizeof(buffer),
4386 "diff--gita/%.*sb/%.*s"
4387 "---a/%.*s"
4388 "+++b/%.*s",
4389 len1, p->one->path,
4390 len2, p->two->path,
4391 len1, p->one->path,
4392 len2, p->two->path);
4393 git_SHA1_Update(&ctx, buffer, len1);
4394
4395 if (diff_filespec_is_binary(p->one) ||
4396 diff_filespec_is_binary(p->two)) {
4397 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4398 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4399 continue;
4400 }
4401
4402 xpp.flags = 0;
4403 xecfg.ctxlen = 3;
4404 xecfg.flags = 0;
4405 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4406 &xpp, &xecfg);
4407 }
4408
4409 git_SHA1_Final(sha1, &ctx);
4410 return 0;
4411 }
4412
4413 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4414 {
4415 struct diff_queue_struct *q = &diff_queued_diff;
4416 int i;
4417 int result = diff_get_patch_id(options, sha1);
4418
4419 for (i = 0; i < q->nr; i++)
4420 diff_free_filepair(q->queue[i]);
4421
4422 free(q->queue);
4423 DIFF_QUEUE_CLEAR(q);
4424
4425 return result;
4426 }
4427
4428 static int is_summary_empty(const struct diff_queue_struct *q)
4429 {
4430 int i;
4431
4432 for (i = 0; i < q->nr; i++) {
4433 const struct diff_filepair *p = q->queue[i];
4434
4435 switch (p->status) {
4436 case DIFF_STATUS_DELETED:
4437 case DIFF_STATUS_ADDED:
4438 case DIFF_STATUS_COPIED:
4439 case DIFF_STATUS_RENAMED:
4440 return 0;
4441 default:
4442 if (p->score)
4443 return 0;
4444 if (p->one->mode && p->two->mode &&
4445 p->one->mode != p->two->mode)
4446 return 0;
4447 break;
4448 }
4449 }
4450 return 1;
4451 }
4452
4453 static const char rename_limit_warning[] =
4454 "inexact rename detection was skipped due to too many files.";
4455
4456 static const char degrade_cc_to_c_warning[] =
4457 "only found copies from modified paths due to too many files.";
4458
4459 static const char rename_limit_advice[] =
4460 "you may want to set your %s variable to at least "
4461 "%d and retry the command.";
4462
4463 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4464 {
4465 if (degraded_cc)
4466 warning(degrade_cc_to_c_warning);
4467 else if (needed)
4468 warning(rename_limit_warning);
4469 else
4470 return;
4471 if (0 < needed && needed < 32767)
4472 warning(rename_limit_advice, varname, needed);
4473 }
4474
4475 void diff_flush(struct diff_options *options)
4476 {
4477 struct diff_queue_struct *q = &diff_queued_diff;
4478 int i, output_format = options->output_format;
4479 int separator = 0;
4480 int dirstat_by_line = 0;
4481
4482 /*
4483 * Order: raw, stat, summary, patch
4484 * or: name/name-status/checkdiff (other bits clear)
4485 */
4486 if (!q->nr)
4487 goto free_queue;
4488
4489 if (output_format & (DIFF_FORMAT_RAW |
4490 DIFF_FORMAT_NAME |
4491 DIFF_FORMAT_NAME_STATUS |
4492 DIFF_FORMAT_CHECKDIFF)) {
4493 for (i = 0; i < q->nr; i++) {
4494 struct diff_filepair *p = q->queue[i];
4495 if (check_pair_status(p))
4496 flush_one_pair(p, options);
4497 }
4498 separator++;
4499 }
4500
4501 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4502 dirstat_by_line = 1;
4503
4504 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4505 dirstat_by_line) {
4506 struct diffstat_t diffstat;
4507
4508 memset(&diffstat, 0, sizeof(struct diffstat_t));
4509 for (i = 0; i < q->nr; i++) {
4510 struct diff_filepair *p = q->queue[i];
4511 if (check_pair_status(p))
4512 diff_flush_stat(p, options, &diffstat);
4513 }
4514 if (output_format & DIFF_FORMAT_NUMSTAT)
4515 show_numstat(&diffstat, options);
4516 if (output_format & DIFF_FORMAT_DIFFSTAT)
4517 show_stats(&diffstat, options);
4518 if (output_format & DIFF_FORMAT_SHORTSTAT)
4519 show_shortstats(&diffstat, options);
4520 if (output_format & DIFF_FORMAT_DIRSTAT)
4521 show_dirstat_by_line(&diffstat, options);
4522 free_diffstat_info(&diffstat);
4523 separator++;
4524 }
4525 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4526 show_dirstat(options);
4527
4528 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4529 for (i = 0; i < q->nr; i++) {
4530 diff_summary(options, q->queue[i]);
4531 }
4532 separator++;
4533 }
4534
4535 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4536 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4537 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4538 /*
4539 * run diff_flush_patch for the exit status. setting
4540 * options->file to /dev/null should be safe, because we
4541 * aren't supposed to produce any output anyway.
4542 */
4543 if (options->close_file)
4544 fclose(options->file);
4545 options->file = fopen("/dev/null", "w");
4546 if (!options->file)
4547 die_errno("Could not open /dev/null");
4548 options->close_file = 1;
4549 for (i = 0; i < q->nr; i++) {
4550 struct diff_filepair *p = q->queue[i];
4551 if (check_pair_status(p))
4552 diff_flush_patch(p, options);
4553 if (options->found_changes)
4554 break;
4555 }
4556 }
4557
4558 if (output_format & DIFF_FORMAT_PATCH) {
4559 if (separator) {
4560 fprintf(options->file, "%s%c",
4561 diff_line_prefix(options),
4562 options->line_termination);
4563 if (options->stat_sep) {
4564 /* attach patch instead of inline */
4565 fputs(options->stat_sep, options->file);
4566 }
4567 }
4568
4569 for (i = 0; i < q->nr; i++) {
4570 struct diff_filepair *p = q->queue[i];
4571 if (check_pair_status(p))
4572 diff_flush_patch(p, options);
4573 }
4574 }
4575
4576 if (output_format & DIFF_FORMAT_CALLBACK)
4577 options->format_callback(q, options, options->format_callback_data);
4578
4579 for (i = 0; i < q->nr; i++)
4580 diff_free_filepair(q->queue[i]);
4581 free_queue:
4582 free(q->queue);
4583 DIFF_QUEUE_CLEAR(q);
4584 if (options->close_file)
4585 fclose(options->file);
4586
4587 /*
4588 * Report the content-level differences with HAS_CHANGES;
4589 * diff_addremove/diff_change does not set the bit when
4590 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4591 */
4592 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4593 if (options->found_changes)
4594 DIFF_OPT_SET(options, HAS_CHANGES);
4595 else
4596 DIFF_OPT_CLR(options, HAS_CHANGES);
4597 }
4598 }
4599
4600 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4601 {
4602 return (((p->status == DIFF_STATUS_MODIFIED) &&
4603 ((p->score &&
4604 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4605 (!p->score &&
4606 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4607 ((p->status != DIFF_STATUS_MODIFIED) &&
4608 filter_bit_tst(p->status, options)));
4609 }
4610
4611 static void diffcore_apply_filter(struct diff_options *options)
4612 {
4613 int i;
4614 struct diff_queue_struct *q = &diff_queued_diff;
4615 struct diff_queue_struct outq;
4616
4617 DIFF_QUEUE_CLEAR(&outq);
4618
4619 if (!options->filter)
4620 return;
4621
4622 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4623 int found;
4624 for (i = found = 0; !found && i < q->nr; i++) {
4625 if (match_filter(options, q->queue[i]))
4626 found++;
4627 }
4628 if (found)
4629 return;
4630
4631 /* otherwise we will clear the whole queue
4632 * by copying the empty outq at the end of this
4633 * function, but first clear the current entries
4634 * in the queue.
4635 */
4636 for (i = 0; i < q->nr; i++)
4637 diff_free_filepair(q->queue[i]);
4638 }
4639 else {
4640 /* Only the matching ones */
4641 for (i = 0; i < q->nr; i++) {
4642 struct diff_filepair *p = q->queue[i];
4643 if (match_filter(options, p))
4644 diff_q(&outq, p);
4645 else
4646 diff_free_filepair(p);
4647 }
4648 }
4649 free(q->queue);
4650 *q = outq;
4651 }
4652
4653 /* Check whether two filespecs with the same mode and size are identical */
4654 static int diff_filespec_is_identical(struct diff_filespec *one,
4655 struct diff_filespec *two)
4656 {
4657 if (S_ISGITLINK(one->mode))
4658 return 0;
4659 if (diff_populate_filespec(one, 0))
4660 return 0;
4661 if (diff_populate_filespec(two, 0))
4662 return 0;
4663 return !memcmp(one->data, two->data, one->size);
4664 }
4665
4666 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4667 {
4668 if (p->done_skip_stat_unmatch)
4669 return p->skip_stat_unmatch_result;
4670
4671 p->done_skip_stat_unmatch = 1;
4672 p->skip_stat_unmatch_result = 0;
4673 /*
4674 * 1. Entries that come from stat info dirtiness
4675 * always have both sides (iow, not create/delete),
4676 * one side of the object name is unknown, with
4677 * the same mode and size. Keep the ones that
4678 * do not match these criteria. They have real
4679 * differences.
4680 *
4681 * 2. At this point, the file is known to be modified,
4682 * with the same mode and size, and the object
4683 * name of one side is unknown. Need to inspect
4684 * the identical contents.
4685 */
4686 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4687 !DIFF_FILE_VALID(p->two) ||
4688 (p->one->sha1_valid && p->two->sha1_valid) ||
4689 (p->one->mode != p->two->mode) ||
4690 diff_populate_filespec(p->one, 1) ||
4691 diff_populate_filespec(p->two, 1) ||
4692 (p->one->size != p->two->size) ||
4693 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4694 p->skip_stat_unmatch_result = 1;
4695 return p->skip_stat_unmatch_result;
4696 }
4697
4698 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4699 {
4700 int i;
4701 struct diff_queue_struct *q = &diff_queued_diff;
4702 struct diff_queue_struct outq;
4703 DIFF_QUEUE_CLEAR(&outq);
4704
4705 for (i = 0; i < q->nr; i++) {
4706 struct diff_filepair *p = q->queue[i];
4707
4708 if (diff_filespec_check_stat_unmatch(p))
4709 diff_q(&outq, p);
4710 else {
4711 /*
4712 * The caller can subtract 1 from skip_stat_unmatch
4713 * to determine how many paths were dirty only
4714 * due to stat info mismatch.
4715 */
4716 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4717 diffopt->skip_stat_unmatch++;
4718 diff_free_filepair(p);
4719 }
4720 }
4721 free(q->queue);
4722 *q = outq;
4723 }
4724
4725 static int diffnamecmp(const void *a_, const void *b_)
4726 {
4727 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4728 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4729 const char *name_a, *name_b;
4730
4731 name_a = a->one ? a->one->path : a->two->path;
4732 name_b = b->one ? b->one->path : b->two->path;
4733 return strcmp(name_a, name_b);
4734 }
4735
4736 void diffcore_fix_diff_index(struct diff_options *options)
4737 {
4738 struct diff_queue_struct *q = &diff_queued_diff;
4739 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4740 }
4741
4742 void diffcore_std(struct diff_options *options)
4743 {
4744 /* NOTE please keep the following in sync with diff_tree_combined() */
4745 if (options->skip_stat_unmatch)
4746 diffcore_skip_stat_unmatch(options);
4747 if (!options->found_follow) {
4748 /* See try_to_follow_renames() in tree-diff.c */
4749 if (options->break_opt != -1)
4750 diffcore_break(options->break_opt);
4751 if (options->detect_rename)
4752 diffcore_rename(options);
4753 if (options->break_opt != -1)
4754 diffcore_merge_broken();
4755 }
4756 if (options->pickaxe)
4757 diffcore_pickaxe(options);
4758 if (options->orderfile)
4759 diffcore_order(options->orderfile);
4760 if (!options->found_follow)
4761 /* See try_to_follow_renames() in tree-diff.c */
4762 diff_resolve_rename_copy();
4763 diffcore_apply_filter(options);
4764
4765 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4766 DIFF_OPT_SET(options, HAS_CHANGES);
4767 else
4768 DIFF_OPT_CLR(options, HAS_CHANGES);
4769
4770 options->found_follow = 0;
4771 }
4772
4773 int diff_result_code(struct diff_options *opt, int status)
4774 {
4775 int result = 0;
4776
4777 diff_warn_rename_limit("diff.renameLimit",
4778 opt->needed_rename_limit,
4779 opt->degraded_cc_to_c);
4780 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4781 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4782 return status;
4783 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4784 DIFF_OPT_TST(opt, HAS_CHANGES))
4785 result |= 01;
4786 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4787 DIFF_OPT_TST(opt, CHECK_FAILED))
4788 result |= 02;
4789 return result;
4790 }
4791
4792 int diff_can_quit_early(struct diff_options *opt)
4793 {
4794 return (DIFF_OPT_TST(opt, QUICK) &&
4795 !opt->filter &&
4796 DIFF_OPT_TST(opt, HAS_CHANGES));
4797 }
4798
4799 /*
4800 * Shall changes to this submodule be ignored?
4801 *
4802 * Submodule changes can be configured to be ignored separately for each path,
4803 * but that configuration can be overridden from the command line.
4804 */
4805 static int is_submodule_ignored(const char *path, struct diff_options *options)
4806 {
4807 int ignored = 0;
4808 unsigned orig_flags = options->flags;
4809 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4810 set_diffopt_flags_from_submodule_config(options, path);
4811 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4812 ignored = 1;
4813 options->flags = orig_flags;
4814 return ignored;
4815 }
4816
4817 void diff_addremove(struct diff_options *options,
4818 int addremove, unsigned mode,
4819 const unsigned char *sha1,
4820 int sha1_valid,
4821 const char *concatpath, unsigned dirty_submodule)
4822 {
4823 struct diff_filespec *one, *two;
4824
4825 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4826 return;
4827
4828 /* This may look odd, but it is a preparation for
4829 * feeding "there are unchanged files which should
4830 * not produce diffs, but when you are doing copy
4831 * detection you would need them, so here they are"
4832 * entries to the diff-core. They will be prefixed
4833 * with something like '=' or '*' (I haven't decided
4834 * which but should not make any difference).
4835 * Feeding the same new and old to diff_change()
4836 * also has the same effect.
4837 * Before the final output happens, they are pruned after
4838 * merged into rename/copy pairs as appropriate.
4839 */
4840 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4841 addremove = (addremove == '+' ? '-' :
4842 addremove == '-' ? '+' : addremove);
4843
4844 if (options->prefix &&
4845 strncmp(concatpath, options->prefix, options->prefix_length))
4846 return;
4847
4848 one = alloc_filespec(concatpath);
4849 two = alloc_filespec(concatpath);
4850
4851 if (addremove != '+')
4852 fill_filespec(one, sha1, sha1_valid, mode);
4853 if (addremove != '-') {
4854 fill_filespec(two, sha1, sha1_valid, mode);
4855 two->dirty_submodule = dirty_submodule;
4856 }
4857
4858 diff_queue(&diff_queued_diff, one, two);
4859 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4860 DIFF_OPT_SET(options, HAS_CHANGES);
4861 }
4862
4863 void diff_change(struct diff_options *options,
4864 unsigned old_mode, unsigned new_mode,
4865 const unsigned char *old_sha1,
4866 const unsigned char *new_sha1,
4867 int old_sha1_valid, int new_sha1_valid,
4868 const char *concatpath,
4869 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4870 {
4871 struct diff_filespec *one, *two;
4872 struct diff_filepair *p;
4873
4874 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4875 is_submodule_ignored(concatpath, options))
4876 return;
4877
4878 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4879 unsigned tmp;
4880 const unsigned char *tmp_c;
4881 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4882 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4883 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4884 new_sha1_valid = tmp;
4885 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4886 new_dirty_submodule = tmp;
4887 }
4888
4889 if (options->prefix &&
4890 strncmp(concatpath, options->prefix, options->prefix_length))
4891 return;
4892
4893 one = alloc_filespec(concatpath);
4894 two = alloc_filespec(concatpath);
4895 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4896 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4897 one->dirty_submodule = old_dirty_submodule;
4898 two->dirty_submodule = new_dirty_submodule;
4899 p = diff_queue(&diff_queued_diff, one, two);
4900
4901 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4902 return;
4903
4904 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
4905 !diff_filespec_check_stat_unmatch(p))
4906 return;
4907
4908 DIFF_OPT_SET(options, HAS_CHANGES);
4909 }
4910
4911 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4912 {
4913 struct diff_filepair *pair;
4914 struct diff_filespec *one, *two;
4915
4916 if (options->prefix &&
4917 strncmp(path, options->prefix, options->prefix_length))
4918 return NULL;
4919
4920 one = alloc_filespec(path);
4921 two = alloc_filespec(path);
4922 pair = diff_queue(&diff_queued_diff, one, two);
4923 pair->is_unmerged = 1;
4924 return pair;
4925 }
4926
4927 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4928 size_t *outsize)
4929 {
4930 struct diff_tempfile *temp;
4931 const char *argv[3];
4932 const char **arg = argv;
4933 struct child_process child;
4934 struct strbuf buf = STRBUF_INIT;
4935 int err = 0;
4936
4937 temp = prepare_temp_file(spec->path, spec);
4938 *arg++ = pgm;
4939 *arg++ = temp->name;
4940 *arg = NULL;
4941
4942 memset(&child, 0, sizeof(child));
4943 child.use_shell = 1;
4944 child.argv = argv;
4945 child.out = -1;
4946 if (start_command(&child)) {
4947 remove_tempfile();
4948 return NULL;
4949 }
4950
4951 if (strbuf_read(&buf, child.out, 0) < 0)
4952 err = error("error reading from textconv command '%s'", pgm);
4953 close(child.out);
4954
4955 if (finish_command(&child) || err) {
4956 strbuf_release(&buf);
4957 remove_tempfile();
4958 return NULL;
4959 }
4960 remove_tempfile();
4961
4962 return strbuf_detach(&buf, outsize);
4963 }
4964
4965 size_t fill_textconv(struct userdiff_driver *driver,
4966 struct diff_filespec *df,
4967 char **outbuf)
4968 {
4969 size_t size;
4970
4971 if (!driver || !driver->textconv) {
4972 if (!DIFF_FILE_VALID(df)) {
4973 *outbuf = "";
4974 return 0;
4975 }
4976 if (diff_populate_filespec(df, 0))
4977 die("unable to read files to diff");
4978 *outbuf = df->data;
4979 return df->size;
4980 }
4981
4982 if (driver->textconv_cache && df->sha1_valid) {
4983 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4984 &size);
4985 if (*outbuf)
4986 return size;
4987 }
4988
4989 *outbuf = run_textconv(driver->textconv, df, &size);
4990 if (!*outbuf)
4991 die("unable to read files to diff");
4992
4993 if (driver->textconv_cache && df->sha1_valid) {
4994 /* ignore errors, as we might be in a readonly repository */
4995 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4996 size);
4997 /*
4998 * we could save up changes and flush them all at the end,
4999 * but we would need an extra call after all diffing is done.
5000 * Since generating a cache entry is the slow path anyway,
5001 * this extra overhead probably isn't a big deal.
5002 */
5003 notes_cache_write(driver->textconv_cache);
5004 }
5005
5006 return size;
5007 }
5008
5009 void setup_diff_pager(struct diff_options *opt)
5010 {
5011 /*
5012 * If the user asked for our exit code, then either they want --quiet
5013 * or --exit-code. We should definitely not bother with a pager in the
5014 * former case, as we will generate no output. Since we still properly
5015 * report our exit code even when a pager is run, we _could_ run a
5016 * pager with --exit-code. But since we have not done so historically,
5017 * and because it is easy to find people oneline advising "git diff
5018 * --exit-code" in hooks and other scripts, we do not do so.
5019 */
5020 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5021 check_pager_config("diff") != 0)
5022 setup_pager();
5023 }
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