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Makefile: fix misdirected redirections
[git.git] / diff.c
blobf62b7f73d8ad52205b0add37a21fd69911783b25
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, /* CONTEXT */
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, "context") || !strcasecmp(var, "plain"))
58 return DIFF_CONTEXT;
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, CHECK_SIZE_ONLY);
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 *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
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, context, 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, context);
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 *context = diff_get_color(ecb->color_diff,
627 DIFF_CONTEXT);
628 putc('\n', ecb->opt->file);
629 emit_line_0(ecb->opt, context, 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 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1006 &xpp, &xecfg))
1007 die("unable to generate word diff");
1008 free(minus.ptr);
1009 free(plus.ptr);
1010 if (diff_words->current_plus != diff_words->plus.text.ptr +
1011 diff_words->plus.text.size) {
1012 if (color_words_output_graph_prefix(diff_words))
1013 fputs(line_prefix, diff_words->opt->file);
1014 fn_out_diff_words_write_helper(diff_words->opt->file,
1015 &style->ctx, style->newline,
1016 diff_words->plus.text.ptr + diff_words->plus.text.size
1017 - diff_words->current_plus, diff_words->current_plus,
1018 line_prefix);
1019 }
1020 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1021 }
1022
1023 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1024 static void diff_words_flush(struct emit_callback *ecbdata)
1025 {
1026 if (ecbdata->diff_words->minus.text.size ||
1027 ecbdata->diff_words->plus.text.size)
1028 diff_words_show(ecbdata->diff_words);
1029 }
1030
1031 static void diff_filespec_load_driver(struct diff_filespec *one)
1032 {
1033 /* Use already-loaded driver */
1034 if (one->driver)
1035 return;
1036
1037 if (S_ISREG(one->mode))
1038 one->driver = userdiff_find_by_path(one->path);
1039
1040 /* Fallback to default settings */
1041 if (!one->driver)
1042 one->driver = userdiff_find_by_name("default");
1043 }
1044
1045 static const char *userdiff_word_regex(struct diff_filespec *one)
1046 {
1047 diff_filespec_load_driver(one);
1048 return one->driver->word_regex;
1049 }
1050
1051 static void init_diff_words_data(struct emit_callback *ecbdata,
1052 struct diff_options *orig_opts,
1053 struct diff_filespec *one,
1054 struct diff_filespec *two)
1055 {
1056 int i;
1057 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1058 memcpy(o, orig_opts, sizeof(struct diff_options));
1059
1060 ecbdata->diff_words =
1061 xcalloc(1, sizeof(struct diff_words_data));
1062 ecbdata->diff_words->type = o->word_diff;
1063 ecbdata->diff_words->opt = o;
1064 if (!o->word_regex)
1065 o->word_regex = userdiff_word_regex(one);
1066 if (!o->word_regex)
1067 o->word_regex = userdiff_word_regex(two);
1068 if (!o->word_regex)
1069 o->word_regex = diff_word_regex_cfg;
1070 if (o->word_regex) {
1071 ecbdata->diff_words->word_regex = (regex_t *)
1072 xmalloc(sizeof(regex_t));
1073 if (regcomp(ecbdata->diff_words->word_regex,
1074 o->word_regex,
1075 REG_EXTENDED | REG_NEWLINE))
1076 die ("Invalid regular expression: %s",
1077 o->word_regex);
1078 }
1079 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1080 if (o->word_diff == diff_words_styles[i].type) {
1081 ecbdata->diff_words->style =
1082 &diff_words_styles[i];
1083 break;
1084 }
1085 }
1086 if (want_color(o->use_color)) {
1087 struct diff_words_style *st = ecbdata->diff_words->style;
1088 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1089 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1090 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
1091 }
1092 }
1093
1094 static void free_diff_words_data(struct emit_callback *ecbdata)
1095 {
1096 if (ecbdata->diff_words) {
1097 diff_words_flush(ecbdata);
1098 free (ecbdata->diff_words->opt);
1099 free (ecbdata->diff_words->minus.text.ptr);
1100 free (ecbdata->diff_words->minus.orig);
1101 free (ecbdata->diff_words->plus.text.ptr);
1102 free (ecbdata->diff_words->plus.orig);
1103 if (ecbdata->diff_words->word_regex) {
1104 regfree(ecbdata->diff_words->word_regex);
1105 free(ecbdata->diff_words->word_regex);
1106 }
1107 free(ecbdata->diff_words);
1108 ecbdata->diff_words = NULL;
1109 }
1110 }
1111
1112 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1113 {
1114 if (want_color(diff_use_color))
1115 return diff_colors[ix];
1116 return "";
1117 }
1118
1119 const char *diff_line_prefix(struct diff_options *opt)
1120 {
1121 struct strbuf *msgbuf;
1122 if (!opt->output_prefix)
1123 return "";
1124
1125 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1126 return msgbuf->buf;
1127 }
1128
1129 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1130 {
1131 const char *cp;
1132 unsigned long allot;
1133 size_t l = len;
1134
1135 if (ecb->truncate)
1136 return ecb->truncate(line, len);
1137 cp = line;
1138 allot = l;
1139 while (0 < l) {
1140 (void) utf8_width(&cp, &l);
1141 if (!cp)
1142 break; /* truncated in the middle? */
1143 }
1144 return allot - l;
1145 }
1146
1147 static void find_lno(const char *line, struct emit_callback *ecbdata)
1148 {
1149 const char *p;
1150 ecbdata->lno_in_preimage = 0;
1151 ecbdata->lno_in_postimage = 0;
1152 p = strchr(line, '-');
1153 if (!p)
1154 return; /* cannot happen */
1155 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1156 p = strchr(p, '+');
1157 if (!p)
1158 return; /* cannot happen */
1159 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1160 }
1161
1162 static void fn_out_consume(void *priv, char *line, unsigned long len)
1163 {
1164 struct emit_callback *ecbdata = priv;
1165 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1166 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1167 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1168 struct diff_options *o = ecbdata->opt;
1169 const char *line_prefix = diff_line_prefix(o);
1170
1171 if (ecbdata->header) {
1172 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1173 strbuf_reset(ecbdata->header);
1174 ecbdata->header = NULL;
1175 }
1176 *(ecbdata->found_changesp) = 1;
1177
1178 if (ecbdata->label_path[0]) {
1179 const char *name_a_tab, *name_b_tab;
1180
1181 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1182 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1183
1184 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1185 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1186 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1187 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1188 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1189 }
1190
1191 if (diff_suppress_blank_empty
1192 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1193 line[0] = '\n';
1194 len = 1;
1195 }
1196
1197 if (line[0] == '@') {
1198 if (ecbdata->diff_words)
1199 diff_words_flush(ecbdata);
1200 len = sane_truncate_line(ecbdata, line, len);
1201 find_lno(line, ecbdata);
1202 emit_hunk_header(ecbdata, line, len);
1203 if (line[len-1] != '\n')
1204 putc('\n', ecbdata->opt->file);
1205 return;
1206 }
1207
1208 if (len < 1) {
1209 emit_line(ecbdata->opt, reset, reset, line, len);
1210 if (ecbdata->diff_words
1211 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1212 fputs("~\n", ecbdata->opt->file);
1213 return;
1214 }
1215
1216 if (ecbdata->diff_words) {
1217 if (line[0] == '-') {
1218 diff_words_append(line, len,
1219 &ecbdata->diff_words->minus);
1220 return;
1221 } else if (line[0] == '+') {
1222 diff_words_append(line, len,
1223 &ecbdata->diff_words->plus);
1224 return;
1225 } else if (starts_with(line, "\\ ")) {
1226 /*
1227 * Eat the "no newline at eof" marker as if we
1228 * saw a "+" or "-" line with nothing on it,
1229 * and return without diff_words_flush() to
1230 * defer processing. If this is the end of
1231 * preimage, more "+" lines may come after it.
1232 */
1233 return;
1234 }
1235 diff_words_flush(ecbdata);
1236 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1237 emit_line(ecbdata->opt, context, reset, line, len);
1238 fputs("~\n", ecbdata->opt->file);
1239 } else {
1240 /*
1241 * Skip the prefix character, if any. With
1242 * diff_suppress_blank_empty, there may be
1243 * none.
1244 */
1245 if (line[0] != '\n') {
1246 line++;
1247 len--;
1248 }
1249 emit_line(ecbdata->opt, context, reset, line, len);
1250 }
1251 return;
1252 }
1253
1254 if (line[0] != '+') {
1255 const char *color =
1256 diff_get_color(ecbdata->color_diff,
1257 line[0] == '-' ? DIFF_FILE_OLD : DIFF_CONTEXT);
1258 ecbdata->lno_in_preimage++;
1259 if (line[0] == ' ')
1260 ecbdata->lno_in_postimage++;
1261 emit_line(ecbdata->opt, color, reset, line, len);
1262 } else {
1263 ecbdata->lno_in_postimage++;
1264 emit_add_line(reset, ecbdata, line + 1, len - 1);
1265 }
1266 }
1267
1268 static char *pprint_rename(const char *a, const char *b)
1269 {
1270 const char *old = a;
1271 const char *new = b;
1272 struct strbuf name = STRBUF_INIT;
1273 int pfx_length, sfx_length;
1274 int pfx_adjust_for_slash;
1275 int len_a = strlen(a);
1276 int len_b = strlen(b);
1277 int a_midlen, b_midlen;
1278 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1279 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1280
1281 if (qlen_a || qlen_b) {
1282 quote_c_style(a, &name, NULL, 0);
1283 strbuf_addstr(&name, " => ");
1284 quote_c_style(b, &name, NULL, 0);
1285 return strbuf_detach(&name, NULL);
1286 }
1287
1288 /* Find common prefix */
1289 pfx_length = 0;
1290 while (*old && *new && *old == *new) {
1291 if (*old == '/')
1292 pfx_length = old - a + 1;
1293 old++;
1294 new++;
1295 }
1296
1297 /* Find common suffix */
1298 old = a + len_a;
1299 new = b + len_b;
1300 sfx_length = 0;
1301 /*
1302 * If there is a common prefix, it must end in a slash. In
1303 * that case we let this loop run 1 into the prefix to see the
1304 * same slash.
1305 *
1306 * If there is no common prefix, we cannot do this as it would
1307 * underrun the input strings.
1308 */
1309 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1310 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1311 b + pfx_length - pfx_adjust_for_slash <= new &&
1312 *old == *new) {
1313 if (*old == '/')
1314 sfx_length = len_a - (old - a);
1315 old--;
1316 new--;
1317 }
1318
1319 /*
1320 * pfx{mid-a => mid-b}sfx
1321 * {pfx-a => pfx-b}sfx
1322 * pfx{sfx-a => sfx-b}
1323 * name-a => name-b
1324 */
1325 a_midlen = len_a - pfx_length - sfx_length;
1326 b_midlen = len_b - pfx_length - sfx_length;
1327 if (a_midlen < 0)
1328 a_midlen = 0;
1329 if (b_midlen < 0)
1330 b_midlen = 0;
1331
1332 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1333 if (pfx_length + sfx_length) {
1334 strbuf_add(&name, a, pfx_length);
1335 strbuf_addch(&name, '{');
1336 }
1337 strbuf_add(&name, a + pfx_length, a_midlen);
1338 strbuf_addstr(&name, " => ");
1339 strbuf_add(&name, b + pfx_length, b_midlen);
1340 if (pfx_length + sfx_length) {
1341 strbuf_addch(&name, '}');
1342 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1343 }
1344 return strbuf_detach(&name, NULL);
1345 }
1346
1347 struct diffstat_t {
1348 int nr;
1349 int alloc;
1350 struct diffstat_file {
1351 char *from_name;
1352 char *name;
1353 char *print_name;
1354 unsigned is_unmerged:1;
1355 unsigned is_binary:1;
1356 unsigned is_renamed:1;
1357 unsigned is_interesting:1;
1358 uintmax_t added, deleted;
1359 } **files;
1360 };
1361
1362 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1363 const char *name_a,
1364 const char *name_b)
1365 {
1366 struct diffstat_file *x;
1367 x = xcalloc(1, sizeof(*x));
1368 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1369 diffstat->files[diffstat->nr++] = x;
1370 if (name_b) {
1371 x->from_name = xstrdup(name_a);
1372 x->name = xstrdup(name_b);
1373 x->is_renamed = 1;
1374 }
1375 else {
1376 x->from_name = NULL;
1377 x->name = xstrdup(name_a);
1378 }
1379 return x;
1380 }
1381
1382 static void diffstat_consume(void *priv, char *line, unsigned long len)
1383 {
1384 struct diffstat_t *diffstat = priv;
1385 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1386
1387 if (line[0] == '+')
1388 x->added++;
1389 else if (line[0] == '-')
1390 x->deleted++;
1391 }
1392
1393 const char mime_boundary_leader[] = "------------";
1394
1395 static int scale_linear(int it, int width, int max_change)
1396 {
1397 if (!it)
1398 return 0;
1399 /*
1400 * make sure that at least one '-' or '+' is printed if
1401 * there is any change to this path. The easiest way is to
1402 * scale linearly as if the alloted width is one column shorter
1403 * than it is, and then add 1 to the result.
1404 */
1405 return 1 + (it * (width - 1) / max_change);
1406 }
1407
1408 static void show_name(FILE *file,
1409 const char *prefix, const char *name, int len)
1410 {
1411 fprintf(file, " %s%-*s |", prefix, len, name);
1412 }
1413
1414 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1415 {
1416 if (cnt <= 0)
1417 return;
1418 fprintf(file, "%s", set);
1419 while (cnt--)
1420 putc(ch, file);
1421 fprintf(file, "%s", reset);
1422 }
1423
1424 static void fill_print_name(struct diffstat_file *file)
1425 {
1426 char *pname;
1427
1428 if (file->print_name)
1429 return;
1430
1431 if (!file->is_renamed) {
1432 struct strbuf buf = STRBUF_INIT;
1433 if (quote_c_style(file->name, &buf, NULL, 0)) {
1434 pname = strbuf_detach(&buf, NULL);
1435 } else {
1436 pname = file->name;
1437 strbuf_release(&buf);
1438 }
1439 } else {
1440 pname = pprint_rename(file->from_name, file->name);
1441 }
1442 file->print_name = pname;
1443 }
1444
1445 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1446 {
1447 struct strbuf sb = STRBUF_INIT;
1448 int ret;
1449
1450 if (!files) {
1451 assert(insertions == 0 && deletions == 0);
1452 return fprintf(fp, "%s\n", " 0 files changed");
1453 }
1454
1455 strbuf_addf(&sb,
1456 (files == 1) ? " %d file changed" : " %d files changed",
1457 files);
1458
1459 /*
1460 * For binary diff, the caller may want to print "x files
1461 * changed" with insertions == 0 && deletions == 0.
1462 *
1463 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1464 * is probably less confusing (i.e skip over "2 files changed
1465 * but nothing about added/removed lines? Is this a bug in Git?").
1466 */
1467 if (insertions || deletions == 0) {
1468 strbuf_addf(&sb,
1469 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1470 insertions);
1471 }
1472
1473 if (deletions || insertions == 0) {
1474 strbuf_addf(&sb,
1475 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1476 deletions);
1477 }
1478 strbuf_addch(&sb, '\n');
1479 ret = fputs(sb.buf, fp);
1480 strbuf_release(&sb);
1481 return ret;
1482 }
1483
1484 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1485 {
1486 int i, len, add, del, adds = 0, dels = 0;
1487 uintmax_t max_change = 0, max_len = 0;
1488 int total_files = data->nr, count;
1489 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1490 const char *reset, *add_c, *del_c;
1491 const char *line_prefix = "";
1492 int extra_shown = 0;
1493
1494 if (data->nr == 0)
1495 return;
1496
1497 line_prefix = diff_line_prefix(options);
1498 count = options->stat_count ? options->stat_count : data->nr;
1499
1500 reset = diff_get_color_opt(options, DIFF_RESET);
1501 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1502 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1503
1504 /*
1505 * Find the longest filename and max number of changes
1506 */
1507 for (i = 0; (i < count) && (i < data->nr); i++) {
1508 struct diffstat_file *file = data->files[i];
1509 uintmax_t change = file->added + file->deleted;
1510
1511 if (!file->is_interesting && (change == 0)) {
1512 count++; /* not shown == room for one more */
1513 continue;
1514 }
1515 fill_print_name(file);
1516 len = strlen(file->print_name);
1517 if (max_len < len)
1518 max_len = len;
1519
1520 if (file->is_unmerged) {
1521 /* "Unmerged" is 8 characters */
1522 bin_width = bin_width < 8 ? 8 : bin_width;
1523 continue;
1524 }
1525 if (file->is_binary) {
1526 /* "Bin XXX -> YYY bytes" */
1527 int w = 14 + decimal_width(file->added)
1528 + decimal_width(file->deleted);
1529 bin_width = bin_width < w ? w : bin_width;
1530 /* Display change counts aligned with "Bin" */
1531 number_width = 3;
1532 continue;
1533 }
1534
1535 if (max_change < change)
1536 max_change = change;
1537 }
1538 count = i; /* where we can stop scanning in data->files[] */
1539
1540 /*
1541 * We have width = stat_width or term_columns() columns total.
1542 * We want a maximum of min(max_len, stat_name_width) for the name part.
1543 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1544 * We also need 1 for " " and 4 + decimal_width(max_change)
1545 * for " | NNNN " and one the empty column at the end, altogether
1546 * 6 + decimal_width(max_change).
1547 *
1548 * If there's not enough space, we will use the smaller of
1549 * stat_name_width (if set) and 5/8*width for the filename,
1550 * and the rest for constant elements + graph part, but no more
1551 * than stat_graph_width for the graph part.
1552 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1553 * for the standard terminal size).
1554 *
1555 * In other words: stat_width limits the maximum width, and
1556 * stat_name_width fixes the maximum width of the filename,
1557 * and is also used to divide available columns if there
1558 * aren't enough.
1559 *
1560 * Binary files are displayed with "Bin XXX -> YYY bytes"
1561 * instead of the change count and graph. This part is treated
1562 * similarly to the graph part, except that it is not
1563 * "scaled". If total width is too small to accommodate the
1564 * guaranteed minimum width of the filename part and the
1565 * separators and this message, this message will "overflow"
1566 * making the line longer than the maximum width.
1567 */
1568
1569 if (options->stat_width == -1)
1570 width = term_columns() - options->output_prefix_length;
1571 else
1572 width = options->stat_width ? options->stat_width : 80;
1573 number_width = decimal_width(max_change) > number_width ?
1574 decimal_width(max_change) : number_width;
1575
1576 if (options->stat_graph_width == -1)
1577 options->stat_graph_width = diff_stat_graph_width;
1578
1579 /*
1580 * Guarantee 3/8*16==6 for the graph part
1581 * and 5/8*16==10 for the filename part
1582 */
1583 if (width < 16 + 6 + number_width)
1584 width = 16 + 6 + number_width;
1585
1586 /*
1587 * First assign sizes that are wanted, ignoring available width.
1588 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1589 * starting from "XXX" should fit in graph_width.
1590 */
1591 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1592 if (options->stat_graph_width &&
1593 options->stat_graph_width < graph_width)
1594 graph_width = options->stat_graph_width;
1595
1596 name_width = (options->stat_name_width > 0 &&
1597 options->stat_name_width < max_len) ?
1598 options->stat_name_width : max_len;
1599
1600 /*
1601 * Adjust adjustable widths not to exceed maximum width
1602 */
1603 if (name_width + number_width + 6 + graph_width > width) {
1604 if (graph_width > width * 3/8 - number_width - 6) {
1605 graph_width = width * 3/8 - number_width - 6;
1606 if (graph_width < 6)
1607 graph_width = 6;
1608 }
1609
1610 if (options->stat_graph_width &&
1611 graph_width > options->stat_graph_width)
1612 graph_width = options->stat_graph_width;
1613 if (name_width > width - number_width - 6 - graph_width)
1614 name_width = width - number_width - 6 - graph_width;
1615 else
1616 graph_width = width - number_width - 6 - name_width;
1617 }
1618
1619 /*
1620 * From here name_width is the width of the name area,
1621 * and graph_width is the width of the graph area.
1622 * max_change is used to scale graph properly.
1623 */
1624 for (i = 0; i < count; i++) {
1625 const char *prefix = "";
1626 struct diffstat_file *file = data->files[i];
1627 char *name = file->print_name;
1628 uintmax_t added = file->added;
1629 uintmax_t deleted = file->deleted;
1630 int name_len;
1631
1632 if (!file->is_interesting && (added + deleted == 0))
1633 continue;
1634
1635 /*
1636 * "scale" the filename
1637 */
1638 len = name_width;
1639 name_len = strlen(name);
1640 if (name_width < name_len) {
1641 char *slash;
1642 prefix = "...";
1643 len -= 3;
1644 name += name_len - len;
1645 slash = strchr(name, '/');
1646 if (slash)
1647 name = slash;
1648 }
1649
1650 if (file->is_binary) {
1651 fprintf(options->file, "%s", line_prefix);
1652 show_name(options->file, prefix, name, len);
1653 fprintf(options->file, " %*s", number_width, "Bin");
1654 if (!added && !deleted) {
1655 putc('\n', options->file);
1656 continue;
1657 }
1658 fprintf(options->file, " %s%"PRIuMAX"%s",
1659 del_c, deleted, reset);
1660 fprintf(options->file, " -> ");
1661 fprintf(options->file, "%s%"PRIuMAX"%s",
1662 add_c, added, reset);
1663 fprintf(options->file, " bytes");
1664 fprintf(options->file, "\n");
1665 continue;
1666 }
1667 else if (file->is_unmerged) {
1668 fprintf(options->file, "%s", line_prefix);
1669 show_name(options->file, prefix, name, len);
1670 fprintf(options->file, " Unmerged\n");
1671 continue;
1672 }
1673
1674 /*
1675 * scale the add/delete
1676 */
1677 add = added;
1678 del = deleted;
1679
1680 if (graph_width <= max_change) {
1681 int total = scale_linear(add + del, graph_width, max_change);
1682 if (total < 2 && add && del)
1683 /* width >= 2 due to the sanity check */
1684 total = 2;
1685 if (add < del) {
1686 add = scale_linear(add, graph_width, max_change);
1687 del = total - add;
1688 } else {
1689 del = scale_linear(del, graph_width, max_change);
1690 add = total - del;
1691 }
1692 }
1693 fprintf(options->file, "%s", line_prefix);
1694 show_name(options->file, prefix, name, len);
1695 fprintf(options->file, " %*"PRIuMAX"%s",
1696 number_width, added + deleted,
1697 added + deleted ? " " : "");
1698 show_graph(options->file, '+', add, add_c, reset);
1699 show_graph(options->file, '-', del, del_c, reset);
1700 fprintf(options->file, "\n");
1701 }
1702
1703 for (i = 0; i < data->nr; i++) {
1704 struct diffstat_file *file = data->files[i];
1705 uintmax_t added = file->added;
1706 uintmax_t deleted = file->deleted;
1707
1708 if (file->is_unmerged ||
1709 (!file->is_interesting && (added + deleted == 0))) {
1710 total_files--;
1711 continue;
1712 }
1713
1714 if (!file->is_binary) {
1715 adds += added;
1716 dels += deleted;
1717 }
1718 if (i < count)
1719 continue;
1720 if (!extra_shown)
1721 fprintf(options->file, "%s ...\n", line_prefix);
1722 extra_shown = 1;
1723 }
1724 fprintf(options->file, "%s", line_prefix);
1725 print_stat_summary(options->file, total_files, adds, dels);
1726 }
1727
1728 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1729 {
1730 int i, adds = 0, dels = 0, total_files = data->nr;
1731
1732 if (data->nr == 0)
1733 return;
1734
1735 for (i = 0; i < data->nr; i++) {
1736 int added = data->files[i]->added;
1737 int deleted= data->files[i]->deleted;
1738
1739 if (data->files[i]->is_unmerged ||
1740 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1741 total_files--;
1742 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1743 adds += added;
1744 dels += deleted;
1745 }
1746 }
1747 fprintf(options->file, "%s", diff_line_prefix(options));
1748 print_stat_summary(options->file, total_files, adds, dels);
1749 }
1750
1751 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1752 {
1753 int i;
1754
1755 if (data->nr == 0)
1756 return;
1757
1758 for (i = 0; i < data->nr; i++) {
1759 struct diffstat_file *file = data->files[i];
1760
1761 fprintf(options->file, "%s", diff_line_prefix(options));
1762
1763 if (file->is_binary)
1764 fprintf(options->file, "-\t-\t");
1765 else
1766 fprintf(options->file,
1767 "%"PRIuMAX"\t%"PRIuMAX"\t",
1768 file->added, file->deleted);
1769 if (options->line_termination) {
1770 fill_print_name(file);
1771 if (!file->is_renamed)
1772 write_name_quoted(file->name, options->file,
1773 options->line_termination);
1774 else {
1775 fputs(file->print_name, options->file);
1776 putc(options->line_termination, options->file);
1777 }
1778 } else {
1779 if (file->is_renamed) {
1780 putc('\0', options->file);
1781 write_name_quoted(file->from_name, options->file, '\0');
1782 }
1783 write_name_quoted(file->name, options->file, '\0');
1784 }
1785 }
1786 }
1787
1788 struct dirstat_file {
1789 const char *name;
1790 unsigned long changed;
1791 };
1792
1793 struct dirstat_dir {
1794 struct dirstat_file *files;
1795 int alloc, nr, permille, cumulative;
1796 };
1797
1798 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1799 unsigned long changed, const char *base, int baselen)
1800 {
1801 unsigned long this_dir = 0;
1802 unsigned int sources = 0;
1803 const char *line_prefix = diff_line_prefix(opt);
1804
1805 while (dir->nr) {
1806 struct dirstat_file *f = dir->files;
1807 int namelen = strlen(f->name);
1808 unsigned long this;
1809 char *slash;
1810
1811 if (namelen < baselen)
1812 break;
1813 if (memcmp(f->name, base, baselen))
1814 break;
1815 slash = strchr(f->name + baselen, '/');
1816 if (slash) {
1817 int newbaselen = slash + 1 - f->name;
1818 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1819 sources++;
1820 } else {
1821 this = f->changed;
1822 dir->files++;
1823 dir->nr--;
1824 sources += 2;
1825 }
1826 this_dir += this;
1827 }
1828
1829 /*
1830 * We don't report dirstat's for
1831 * - the top level
1832 * - or cases where everything came from a single directory
1833 * under this directory (sources == 1).
1834 */
1835 if (baselen && sources != 1) {
1836 if (this_dir) {
1837 int permille = this_dir * 1000 / changed;
1838 if (permille >= dir->permille) {
1839 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1840 permille / 10, permille % 10, baselen, base);
1841 if (!dir->cumulative)
1842 return 0;
1843 }
1844 }
1845 }
1846 return this_dir;
1847 }
1848
1849 static int dirstat_compare(const void *_a, const void *_b)
1850 {
1851 const struct dirstat_file *a = _a;
1852 const struct dirstat_file *b = _b;
1853 return strcmp(a->name, b->name);
1854 }
1855
1856 static void show_dirstat(struct diff_options *options)
1857 {
1858 int i;
1859 unsigned long changed;
1860 struct dirstat_dir dir;
1861 struct diff_queue_struct *q = &diff_queued_diff;
1862
1863 dir.files = NULL;
1864 dir.alloc = 0;
1865 dir.nr = 0;
1866 dir.permille = options->dirstat_permille;
1867 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1868
1869 changed = 0;
1870 for (i = 0; i < q->nr; i++) {
1871 struct diff_filepair *p = q->queue[i];
1872 const char *name;
1873 unsigned long copied, added, damage;
1874 int content_changed;
1875
1876 name = p->two->path ? p->two->path : p->one->path;
1877
1878 if (p->one->sha1_valid && p->two->sha1_valid)
1879 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1880 else
1881 content_changed = 1;
1882
1883 if (!content_changed) {
1884 /*
1885 * The SHA1 has not changed, so pre-/post-content is
1886 * identical. We can therefore skip looking at the
1887 * file contents altogether.
1888 */
1889 damage = 0;
1890 goto found_damage;
1891 }
1892
1893 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1894 /*
1895 * In --dirstat-by-file mode, we don't really need to
1896 * look at the actual file contents at all.
1897 * The fact that the SHA1 changed is enough for us to
1898 * add this file to the list of results
1899 * (with each file contributing equal damage).
1900 */
1901 damage = 1;
1902 goto found_damage;
1903 }
1904
1905 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1906 diff_populate_filespec(p->one, 0);
1907 diff_populate_filespec(p->two, 0);
1908 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1909 &copied, &added);
1910 diff_free_filespec_data(p->one);
1911 diff_free_filespec_data(p->two);
1912 } else if (DIFF_FILE_VALID(p->one)) {
1913 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
1914 copied = added = 0;
1915 diff_free_filespec_data(p->one);
1916 } else if (DIFF_FILE_VALID(p->two)) {
1917 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
1918 copied = 0;
1919 added = p->two->size;
1920 diff_free_filespec_data(p->two);
1921 } else
1922 continue;
1923
1924 /*
1925 * Original minus copied is the removed material,
1926 * added is the new material. They are both damages
1927 * made to the preimage.
1928 * If the resulting damage is zero, we know that
1929 * diffcore_count_changes() considers the two entries to
1930 * be identical, but since content_changed is true, we
1931 * know that there must have been _some_ kind of change,
1932 * so we force all entries to have damage > 0.
1933 */
1934 damage = (p->one->size - copied) + added;
1935 if (!damage)
1936 damage = 1;
1937
1938 found_damage:
1939 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1940 dir.files[dir.nr].name = name;
1941 dir.files[dir.nr].changed = damage;
1942 changed += damage;
1943 dir.nr++;
1944 }
1945
1946 /* This can happen even with many files, if everything was renames */
1947 if (!changed)
1948 return;
1949
1950 /* Show all directories with more than x% of the changes */
1951 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1952 gather_dirstat(options, &dir, changed, "", 0);
1953 }
1954
1955 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1956 {
1957 int i;
1958 unsigned long changed;
1959 struct dirstat_dir dir;
1960
1961 if (data->nr == 0)
1962 return;
1963
1964 dir.files = NULL;
1965 dir.alloc = 0;
1966 dir.nr = 0;
1967 dir.permille = options->dirstat_permille;
1968 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1969
1970 changed = 0;
1971 for (i = 0; i < data->nr; i++) {
1972 struct diffstat_file *file = data->files[i];
1973 unsigned long damage = file->added + file->deleted;
1974 if (file->is_binary)
1975 /*
1976 * binary files counts bytes, not lines. Must find some
1977 * way to normalize binary bytes vs. textual lines.
1978 * The following heuristic assumes that there are 64
1979 * bytes per "line".
1980 * This is stupid and ugly, but very cheap...
1981 */
1982 damage = (damage + 63) / 64;
1983 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1984 dir.files[dir.nr].name = file->name;
1985 dir.files[dir.nr].changed = damage;
1986 changed += damage;
1987 dir.nr++;
1988 }
1989
1990 /* This can happen even with many files, if everything was renames */
1991 if (!changed)
1992 return;
1993
1994 /* Show all directories with more than x% of the changes */
1995 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1996 gather_dirstat(options, &dir, changed, "", 0);
1997 }
1998
1999 static void free_diffstat_info(struct diffstat_t *diffstat)
2000 {
2001 int i;
2002 for (i = 0; i < diffstat->nr; i++) {
2003 struct diffstat_file *f = diffstat->files[i];
2004 if (f->name != f->print_name)
2005 free(f->print_name);
2006 free(f->name);
2007 free(f->from_name);
2008 free(f);
2009 }
2010 free(diffstat->files);
2011 }
2012
2013 struct checkdiff_t {
2014 const char *filename;
2015 int lineno;
2016 int conflict_marker_size;
2017 struct diff_options *o;
2018 unsigned ws_rule;
2019 unsigned status;
2020 };
2021
2022 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2023 {
2024 char firstchar;
2025 int cnt;
2026
2027 if (len < marker_size + 1)
2028 return 0;
2029 firstchar = line[0];
2030 switch (firstchar) {
2031 case '=': case '>': case '<': case '|':
2032 break;
2033 default:
2034 return 0;
2035 }
2036 for (cnt = 1; cnt < marker_size; cnt++)
2037 if (line[cnt] != firstchar)
2038 return 0;
2039 /* line[1] thru line[marker_size-1] are same as firstchar */
2040 if (len < marker_size + 1 || !isspace(line[marker_size]))
2041 return 0;
2042 return 1;
2043 }
2044
2045 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2046 {
2047 struct checkdiff_t *data = priv;
2048 int marker_size = data->conflict_marker_size;
2049 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2050 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2051 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2052 char *err;
2053 const char *line_prefix;
2054
2055 assert(data->o);
2056 line_prefix = diff_line_prefix(data->o);
2057
2058 if (line[0] == '+') {
2059 unsigned bad;
2060 data->lineno++;
2061 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2062 data->status |= 1;
2063 fprintf(data->o->file,
2064 "%s%s:%d: leftover conflict marker\n",
2065 line_prefix, data->filename, data->lineno);
2066 }
2067 bad = ws_check(line + 1, len - 1, data->ws_rule);
2068 if (!bad)
2069 return;
2070 data->status |= bad;
2071 err = whitespace_error_string(bad);
2072 fprintf(data->o->file, "%s%s:%d: %s.\n",
2073 line_prefix, data->filename, data->lineno, err);
2074 free(err);
2075 emit_line(data->o, set, reset, line, 1);
2076 ws_check_emit(line + 1, len - 1, data->ws_rule,
2077 data->o->file, set, reset, ws);
2078 } else if (line[0] == ' ') {
2079 data->lineno++;
2080 } else if (line[0] == '@') {
2081 char *plus = strchr(line, '+');
2082 if (plus)
2083 data->lineno = strtol(plus, NULL, 10) - 1;
2084 else
2085 die("invalid diff");
2086 }
2087 }
2088
2089 static unsigned char *deflate_it(char *data,
2090 unsigned long size,
2091 unsigned long *result_size)
2092 {
2093 int bound;
2094 unsigned char *deflated;
2095 git_zstream stream;
2096
2097 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, CHECK_BINARY);
2191 if (one->is_binary == -1 && 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 (!one->data && !two->data &&
2327 S_ISREG(one->mode) && S_ISREG(two->mode) &&
2328 !DIFF_OPT_TST(o, BINARY)) {
2329 if (!hashcmp(one->sha1, two->sha1)) {
2330 if (must_show_header)
2331 fprintf(o->file, "%s", header.buf);
2332 goto free_ab_and_return;
2333 }
2334 fprintf(o->file, "%s", header.buf);
2335 fprintf(o->file, "%sBinary files %s and %s differ\n",
2336 line_prefix, lbl[0], lbl[1]);
2337 goto free_ab_and_return;
2338 }
2339 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2340 die("unable to read files to diff");
2341 /* Quite common confusing case */
2342 if (mf1.size == mf2.size &&
2343 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2344 if (must_show_header)
2345 fprintf(o->file, "%s", header.buf);
2346 goto free_ab_and_return;
2347 }
2348 fprintf(o->file, "%s", header.buf);
2349 strbuf_reset(&header);
2350 if (DIFF_OPT_TST(o, BINARY))
2351 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2352 else
2353 fprintf(o->file, "%sBinary files %s and %s differ\n",
2354 line_prefix, lbl[0], lbl[1]);
2355 o->found_changes = 1;
2356 } else {
2357 /* Crazy xdl interfaces.. */
2358 const char *diffopts = getenv("GIT_DIFF_OPTS");
2359 const char *v;
2360 xpparam_t xpp;
2361 xdemitconf_t xecfg;
2362 struct emit_callback ecbdata;
2363 const struct userdiff_funcname *pe;
2364
2365 if (must_show_header) {
2366 fprintf(o->file, "%s", header.buf);
2367 strbuf_reset(&header);
2368 }
2369
2370 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2371 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2372
2373 pe = diff_funcname_pattern(one);
2374 if (!pe)
2375 pe = diff_funcname_pattern(two);
2376
2377 memset(&xpp, 0, sizeof(xpp));
2378 memset(&xecfg, 0, sizeof(xecfg));
2379 memset(&ecbdata, 0, sizeof(ecbdata));
2380 ecbdata.label_path = lbl;
2381 ecbdata.color_diff = want_color(o->use_color);
2382 ecbdata.found_changesp = &o->found_changes;
2383 ecbdata.ws_rule = whitespace_rule(name_b);
2384 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2385 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2386 ecbdata.opt = o;
2387 ecbdata.header = header.len ? &header : NULL;
2388 xpp.flags = o->xdl_opts;
2389 xecfg.ctxlen = o->context;
2390 xecfg.interhunkctxlen = o->interhunkcontext;
2391 xecfg.flags = XDL_EMIT_FUNCNAMES;
2392 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2393 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2394 if (pe)
2395 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2396 if (!diffopts)
2397 ;
2398 else if (skip_prefix(diffopts, "--unified=", &v))
2399 xecfg.ctxlen = strtoul(v, NULL, 10);
2400 else if (skip_prefix(diffopts, "-u", &v))
2401 xecfg.ctxlen = strtoul(v, NULL, 10);
2402 if (o->word_diff)
2403 init_diff_words_data(&ecbdata, o, one, two);
2404 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2405 &xpp, &xecfg))
2406 die("unable to generate diff for %s", one->path);
2407 if (o->word_diff)
2408 free_diff_words_data(&ecbdata);
2409 if (textconv_one)
2410 free(mf1.ptr);
2411 if (textconv_two)
2412 free(mf2.ptr);
2413 xdiff_clear_find_func(&xecfg);
2414 }
2415
2416 free_ab_and_return:
2417 strbuf_release(&header);
2418 diff_free_filespec_data(one);
2419 diff_free_filespec_data(two);
2420 free(a_one);
2421 free(b_two);
2422 return;
2423 }
2424
2425 static void builtin_diffstat(const char *name_a, const char *name_b,
2426 struct diff_filespec *one,
2427 struct diff_filespec *two,
2428 struct diffstat_t *diffstat,
2429 struct diff_options *o,
2430 struct diff_filepair *p)
2431 {
2432 mmfile_t mf1, mf2;
2433 struct diffstat_file *data;
2434 int same_contents;
2435 int complete_rewrite = 0;
2436
2437 if (!DIFF_PAIR_UNMERGED(p)) {
2438 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2439 complete_rewrite = 1;
2440 }
2441
2442 data = diffstat_add(diffstat, name_a, name_b);
2443 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2444
2445 if (!one || !two) {
2446 data->is_unmerged = 1;
2447 return;
2448 }
2449
2450 same_contents = !hashcmp(one->sha1, two->sha1);
2451
2452 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2453 data->is_binary = 1;
2454 if (same_contents) {
2455 data->added = 0;
2456 data->deleted = 0;
2457 } else {
2458 data->added = diff_filespec_size(two);
2459 data->deleted = diff_filespec_size(one);
2460 }
2461 }
2462
2463 else if (complete_rewrite) {
2464 diff_populate_filespec(one, 0);
2465 diff_populate_filespec(two, 0);
2466 data->deleted = count_lines(one->data, one->size);
2467 data->added = count_lines(two->data, two->size);
2468 }
2469
2470 else if (!same_contents) {
2471 /* Crazy xdl interfaces.. */
2472 xpparam_t xpp;
2473 xdemitconf_t xecfg;
2474
2475 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2476 die("unable to read files to diff");
2477
2478 memset(&xpp, 0, sizeof(xpp));
2479 memset(&xecfg, 0, sizeof(xecfg));
2480 xpp.flags = o->xdl_opts;
2481 xecfg.ctxlen = o->context;
2482 xecfg.interhunkctxlen = o->interhunkcontext;
2483 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2484 &xpp, &xecfg))
2485 die("unable to generate diffstat for %s", one->path);
2486 }
2487
2488 diff_free_filespec_data(one);
2489 diff_free_filespec_data(two);
2490 }
2491
2492 static void builtin_checkdiff(const char *name_a, const char *name_b,
2493 const char *attr_path,
2494 struct diff_filespec *one,
2495 struct diff_filespec *two,
2496 struct diff_options *o)
2497 {
2498 mmfile_t mf1, mf2;
2499 struct checkdiff_t data;
2500
2501 if (!two)
2502 return;
2503
2504 memset(&data, 0, sizeof(data));
2505 data.filename = name_b ? name_b : name_a;
2506 data.lineno = 0;
2507 data.o = o;
2508 data.ws_rule = whitespace_rule(attr_path);
2509 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2510
2511 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2512 die("unable to read files to diff");
2513
2514 /*
2515 * All the other codepaths check both sides, but not checking
2516 * the "old" side here is deliberate. We are checking the newly
2517 * introduced changes, and as long as the "new" side is text, we
2518 * can and should check what it introduces.
2519 */
2520 if (diff_filespec_is_binary(two))
2521 goto free_and_return;
2522 else {
2523 /* Crazy xdl interfaces.. */
2524 xpparam_t xpp;
2525 xdemitconf_t xecfg;
2526
2527 memset(&xpp, 0, sizeof(xpp));
2528 memset(&xecfg, 0, sizeof(xecfg));
2529 xecfg.ctxlen = 1; /* at least one context line */
2530 xpp.flags = 0;
2531 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2532 &xpp, &xecfg))
2533 die("unable to generate checkdiff for %s", one->path);
2534
2535 if (data.ws_rule & WS_BLANK_AT_EOF) {
2536 struct emit_callback ecbdata;
2537 int blank_at_eof;
2538
2539 ecbdata.ws_rule = data.ws_rule;
2540 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2541 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2542
2543 if (blank_at_eof) {
2544 static char *err;
2545 if (!err)
2546 err = whitespace_error_string(WS_BLANK_AT_EOF);
2547 fprintf(o->file, "%s:%d: %s.\n",
2548 data.filename, blank_at_eof, err);
2549 data.status = 1; /* report errors */
2550 }
2551 }
2552 }
2553 free_and_return:
2554 diff_free_filespec_data(one);
2555 diff_free_filespec_data(two);
2556 if (data.status)
2557 DIFF_OPT_SET(o, CHECK_FAILED);
2558 }
2559
2560 struct diff_filespec *alloc_filespec(const char *path)
2561 {
2562 int namelen = strlen(path);
2563 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2564
2565 memset(spec, 0, sizeof(*spec));
2566 spec->path = (char *)(spec + 1);
2567 memcpy(spec->path, path, namelen+1);
2568 spec->count = 1;
2569 spec->is_binary = -1;
2570 return spec;
2571 }
2572
2573 void free_filespec(struct diff_filespec *spec)
2574 {
2575 if (!--spec->count) {
2576 diff_free_filespec_data(spec);
2577 free(spec);
2578 }
2579 }
2580
2581 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2582 int sha1_valid, unsigned short mode)
2583 {
2584 if (mode) {
2585 spec->mode = canon_mode(mode);
2586 hashcpy(spec->sha1, sha1);
2587 spec->sha1_valid = sha1_valid;
2588 }
2589 }
2590
2591 /*
2592 * Given a name and sha1 pair, if the index tells us the file in
2593 * the work tree has that object contents, return true, so that
2594 * prepare_temp_file() does not have to inflate and extract.
2595 */
2596 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2597 {
2598 const struct cache_entry *ce;
2599 struct stat st;
2600 int pos, len;
2601
2602 /*
2603 * We do not read the cache ourselves here, because the
2604 * benchmark with my previous version that always reads cache
2605 * shows that it makes things worse for diff-tree comparing
2606 * two linux-2.6 kernel trees in an already checked out work
2607 * tree. This is because most diff-tree comparisons deal with
2608 * only a small number of files, while reading the cache is
2609 * expensive for a large project, and its cost outweighs the
2610 * savings we get by not inflating the object to a temporary
2611 * file. Practically, this code only helps when we are used
2612 * by diff-cache --cached, which does read the cache before
2613 * calling us.
2614 */
2615 if (!active_cache)
2616 return 0;
2617
2618 /* We want to avoid the working directory if our caller
2619 * doesn't need the data in a normal file, this system
2620 * is rather slow with its stat/open/mmap/close syscalls,
2621 * and the object is contained in a pack file. The pack
2622 * is probably already open and will be faster to obtain
2623 * the data through than the working directory. Loose
2624 * objects however would tend to be slower as they need
2625 * to be individually opened and inflated.
2626 */
2627 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2628 return 0;
2629
2630 len = strlen(name);
2631 pos = cache_name_pos(name, len);
2632 if (pos < 0)
2633 return 0;
2634 ce = active_cache[pos];
2635
2636 /*
2637 * This is not the sha1 we are looking for, or
2638 * unreusable because it is not a regular file.
2639 */
2640 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2641 return 0;
2642
2643 /*
2644 * If ce is marked as "assume unchanged", there is no
2645 * guarantee that work tree matches what we are looking for.
2646 */
2647 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2648 return 0;
2649
2650 /*
2651 * If ce matches the file in the work tree, we can reuse it.
2652 */
2653 if (ce_uptodate(ce) ||
2654 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2655 return 1;
2656
2657 return 0;
2658 }
2659
2660 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2661 {
2662 int len;
2663 char *data = xmalloc(100), *dirty = "";
2664
2665 /* Are we looking at the work tree? */
2666 if (s->dirty_submodule)
2667 dirty = "-dirty";
2668
2669 len = snprintf(data, 100,
2670 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2671 s->data = data;
2672 s->size = len;
2673 s->should_free = 1;
2674 if (size_only) {
2675 s->data = NULL;
2676 free(data);
2677 }
2678 return 0;
2679 }
2680
2681 /*
2682 * While doing rename detection and pickaxe operation, we may need to
2683 * grab the data for the blob (or file) for our own in-core comparison.
2684 * diff_filespec has data and size fields for this purpose.
2685 */
2686 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
2687 {
2688 int size_only = flags & CHECK_SIZE_ONLY;
2689 int err = 0;
2690 /*
2691 * demote FAIL to WARN to allow inspecting the situation
2692 * instead of refusing.
2693 */
2694 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2695 ? SAFE_CRLF_WARN
2696 : safe_crlf);
2697
2698 if (!DIFF_FILE_VALID(s))
2699 die("internal error: asking to populate invalid file.");
2700 if (S_ISDIR(s->mode))
2701 return -1;
2702
2703 if (s->data)
2704 return 0;
2705
2706 if (size_only && 0 < s->size)
2707 return 0;
2708
2709 if (S_ISGITLINK(s->mode))
2710 return diff_populate_gitlink(s, size_only);
2711
2712 if (!s->sha1_valid ||
2713 reuse_worktree_file(s->path, s->sha1, 0)) {
2714 struct strbuf buf = STRBUF_INIT;
2715 struct stat st;
2716 int fd;
2717
2718 if (lstat(s->path, &st) < 0) {
2719 if (errno == ENOENT) {
2720 err_empty:
2721 err = -1;
2722 empty:
2723 s->data = (char *)"";
2724 s->size = 0;
2725 return err;
2726 }
2727 }
2728 s->size = xsize_t(st.st_size);
2729 if (!s->size)
2730 goto empty;
2731 if (S_ISLNK(st.st_mode)) {
2732 struct strbuf sb = STRBUF_INIT;
2733
2734 if (strbuf_readlink(&sb, s->path, s->size))
2735 goto err_empty;
2736 s->size = sb.len;
2737 s->data = strbuf_detach(&sb, NULL);
2738 s->should_free = 1;
2739 return 0;
2740 }
2741 if (size_only)
2742 return 0;
2743 if ((flags & CHECK_BINARY) &&
2744 s->size > big_file_threshold && s->is_binary == -1) {
2745 s->is_binary = 1;
2746 return 0;
2747 }
2748 fd = open(s->path, O_RDONLY);
2749 if (fd < 0)
2750 goto err_empty;
2751 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2752 close(fd);
2753 s->should_munmap = 1;
2754
2755 /*
2756 * Convert from working tree format to canonical git format
2757 */
2758 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2759 size_t size = 0;
2760 munmap(s->data, s->size);
2761 s->should_munmap = 0;
2762 s->data = strbuf_detach(&buf, &size);
2763 s->size = size;
2764 s->should_free = 1;
2765 }
2766 }
2767 else {
2768 enum object_type type;
2769 if (size_only || (flags & CHECK_BINARY)) {
2770 type = sha1_object_info(s->sha1, &s->size);
2771 if (type < 0)
2772 die("unable to read %s", sha1_to_hex(s->sha1));
2773 if (size_only)
2774 return 0;
2775 if (s->size > big_file_threshold && s->is_binary == -1) {
2776 s->is_binary = 1;
2777 return 0;
2778 }
2779 }
2780 s->data = read_sha1_file(s->sha1, &type, &s->size);
2781 if (!s->data)
2782 die("unable to read %s", sha1_to_hex(s->sha1));
2783 s->should_free = 1;
2784 }
2785 return 0;
2786 }
2787
2788 void diff_free_filespec_blob(struct diff_filespec *s)
2789 {
2790 if (s->should_free)
2791 free(s->data);
2792 else if (s->should_munmap)
2793 munmap(s->data, s->size);
2794
2795 if (s->should_free || s->should_munmap) {
2796 s->should_free = s->should_munmap = 0;
2797 s->data = NULL;
2798 }
2799 }
2800
2801 void diff_free_filespec_data(struct diff_filespec *s)
2802 {
2803 diff_free_filespec_blob(s);
2804 free(s->cnt_data);
2805 s->cnt_data = NULL;
2806 }
2807
2808 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2809 void *blob,
2810 unsigned long size,
2811 const unsigned char *sha1,
2812 int mode)
2813 {
2814 int fd;
2815 struct strbuf buf = STRBUF_INIT;
2816 struct strbuf template = STRBUF_INIT;
2817 char *path_dup = xstrdup(path);
2818 const char *base = basename(path_dup);
2819
2820 /* Generate "XXXXXX_basename.ext" */
2821 strbuf_addstr(&template, "XXXXXX_");
2822 strbuf_addstr(&template, base);
2823
2824 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2825 strlen(base) + 1);
2826 if (fd < 0)
2827 die_errno("unable to create temp-file");
2828 if (convert_to_working_tree(path,
2829 (const char *)blob, (size_t)size, &buf)) {
2830 blob = buf.buf;
2831 size = buf.len;
2832 }
2833 if (write_in_full(fd, blob, size) != size)
2834 die_errno("unable to write temp-file");
2835 close(fd);
2836 temp->name = temp->tmp_path;
2837 strcpy(temp->hex, sha1_to_hex(sha1));
2838 temp->hex[40] = 0;
2839 sprintf(temp->mode, "%06o", mode);
2840 strbuf_release(&buf);
2841 strbuf_release(&template);
2842 free(path_dup);
2843 }
2844
2845 static struct diff_tempfile *prepare_temp_file(const char *name,
2846 struct diff_filespec *one)
2847 {
2848 struct diff_tempfile *temp = claim_diff_tempfile();
2849
2850 if (!DIFF_FILE_VALID(one)) {
2851 not_a_valid_file:
2852 /* A '-' entry produces this for file-2, and
2853 * a '+' entry produces this for file-1.
2854 */
2855 temp->name = "/dev/null";
2856 strcpy(temp->hex, ".");
2857 strcpy(temp->mode, ".");
2858 return temp;
2859 }
2860
2861 if (!remove_tempfile_installed) {
2862 atexit(remove_tempfile);
2863 sigchain_push_common(remove_tempfile_on_signal);
2864 remove_tempfile_installed = 1;
2865 }
2866
2867 if (!S_ISGITLINK(one->mode) &&
2868 (!one->sha1_valid ||
2869 reuse_worktree_file(name, one->sha1, 1))) {
2870 struct stat st;
2871 if (lstat(name, &st) < 0) {
2872 if (errno == ENOENT)
2873 goto not_a_valid_file;
2874 die_errno("stat(%s)", name);
2875 }
2876 if (S_ISLNK(st.st_mode)) {
2877 struct strbuf sb = STRBUF_INIT;
2878 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2879 die_errno("readlink(%s)", name);
2880 prep_temp_blob(name, temp, sb.buf, sb.len,
2881 (one->sha1_valid ?
2882 one->sha1 : null_sha1),
2883 (one->sha1_valid ?
2884 one->mode : S_IFLNK));
2885 strbuf_release(&sb);
2886 }
2887 else {
2888 /* we can borrow from the file in the work tree */
2889 temp->name = name;
2890 if (!one->sha1_valid)
2891 strcpy(temp->hex, sha1_to_hex(null_sha1));
2892 else
2893 strcpy(temp->hex, sha1_to_hex(one->sha1));
2894 /* Even though we may sometimes borrow the
2895 * contents from the work tree, we always want
2896 * one->mode. mode is trustworthy even when
2897 * !(one->sha1_valid), as long as
2898 * DIFF_FILE_VALID(one).
2899 */
2900 sprintf(temp->mode, "%06o", one->mode);
2901 }
2902 return temp;
2903 }
2904 else {
2905 if (diff_populate_filespec(one, 0))
2906 die("cannot read data blob for %s", one->path);
2907 prep_temp_blob(name, temp, one->data, one->size,
2908 one->sha1, one->mode);
2909 }
2910 return temp;
2911 }
2912
2913 static void add_external_diff_name(struct argv_array *argv,
2914 const char *name,
2915 struct diff_filespec *df)
2916 {
2917 struct diff_tempfile *temp = prepare_temp_file(name, df);
2918 argv_array_push(argv, temp->name);
2919 argv_array_push(argv, temp->hex);
2920 argv_array_push(argv, temp->mode);
2921 }
2922
2923 /* An external diff command takes:
2924 *
2925 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2926 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2927 *
2928 */
2929 static void run_external_diff(const char *pgm,
2930 const char *name,
2931 const char *other,
2932 struct diff_filespec *one,
2933 struct diff_filespec *two,
2934 const char *xfrm_msg,
2935 int complete_rewrite,
2936 struct diff_options *o)
2937 {
2938 struct argv_array argv = ARGV_ARRAY_INIT;
2939 struct argv_array env = ARGV_ARRAY_INIT;
2940 struct diff_queue_struct *q = &diff_queued_diff;
2941
2942 argv_array_push(&argv, pgm);
2943 argv_array_push(&argv, name);
2944
2945 if (one && two) {
2946 add_external_diff_name(&argv, name, one);
2947 if (!other)
2948 add_external_diff_name(&argv, name, two);
2949 else {
2950 add_external_diff_name(&argv, other, two);
2951 argv_array_push(&argv, other);
2952 argv_array_push(&argv, xfrm_msg);
2953 }
2954 }
2955
2956 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
2957 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
2958
2959 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
2960 die(_("external diff died, stopping at %s"), name);
2961
2962 remove_tempfile();
2963 argv_array_clear(&argv);
2964 argv_array_clear(&env);
2965 }
2966
2967 static int similarity_index(struct diff_filepair *p)
2968 {
2969 return p->score * 100 / MAX_SCORE;
2970 }
2971
2972 static void fill_metainfo(struct strbuf *msg,
2973 const char *name,
2974 const char *other,
2975 struct diff_filespec *one,
2976 struct diff_filespec *two,
2977 struct diff_options *o,
2978 struct diff_filepair *p,
2979 int *must_show_header,
2980 int use_color)
2981 {
2982 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2983 const char *reset = diff_get_color(use_color, DIFF_RESET);
2984 const char *line_prefix = diff_line_prefix(o);
2985
2986 *must_show_header = 1;
2987 strbuf_init(msg, PATH_MAX * 2 + 300);
2988 switch (p->status) {
2989 case DIFF_STATUS_COPIED:
2990 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2991 line_prefix, set, similarity_index(p));
2992 strbuf_addf(msg, "%s\n%s%scopy from ",
2993 reset, line_prefix, set);
2994 quote_c_style(name, msg, NULL, 0);
2995 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2996 quote_c_style(other, msg, NULL, 0);
2997 strbuf_addf(msg, "%s\n", reset);
2998 break;
2999 case DIFF_STATUS_RENAMED:
3000 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3001 line_prefix, set, similarity_index(p));
3002 strbuf_addf(msg, "%s\n%s%srename from ",
3003 reset, line_prefix, set);
3004 quote_c_style(name, msg, NULL, 0);
3005 strbuf_addf(msg, "%s\n%s%srename to ",
3006 reset, line_prefix, set);
3007 quote_c_style(other, msg, NULL, 0);
3008 strbuf_addf(msg, "%s\n", reset);
3009 break;
3010 case DIFF_STATUS_MODIFIED:
3011 if (p->score) {
3012 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3013 line_prefix,
3014 set, similarity_index(p), reset);
3015 break;
3016 }
3017 /* fallthru */
3018 default:
3019 *must_show_header = 0;
3020 }
3021 if (one && two && hashcmp(one->sha1, two->sha1)) {
3022 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3023
3024 if (DIFF_OPT_TST(o, BINARY)) {
3025 mmfile_t mf;
3026 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3027 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3028 abbrev = 40;
3029 }
3030 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3031 find_unique_abbrev(one->sha1, abbrev));
3032 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3033 if (one->mode == two->mode)
3034 strbuf_addf(msg, " %06o", one->mode);
3035 strbuf_addf(msg, "%s\n", reset);
3036 }
3037 }
3038
3039 static void run_diff_cmd(const char *pgm,
3040 const char *name,
3041 const char *other,
3042 const char *attr_path,
3043 struct diff_filespec *one,
3044 struct diff_filespec *two,
3045 struct strbuf *msg,
3046 struct diff_options *o,
3047 struct diff_filepair *p)
3048 {
3049 const char *xfrm_msg = NULL;
3050 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3051 int must_show_header = 0;
3052
3053
3054 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3055 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3056 if (drv && drv->external)
3057 pgm = drv->external;
3058 }
3059
3060 if (msg) {
3061 /*
3062 * don't use colors when the header is intended for an
3063 * external diff driver
3064 */
3065 fill_metainfo(msg, name, other, one, two, o, p,
3066 &must_show_header,
3067 want_color(o->use_color) && !pgm);
3068 xfrm_msg = msg->len ? msg->buf : NULL;
3069 }
3070
3071 if (pgm) {
3072 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3073 complete_rewrite, o);
3074 return;
3075 }
3076 if (one && two)
3077 builtin_diff(name, other ? other : name,
3078 one, two, xfrm_msg, must_show_header,
3079 o, complete_rewrite);
3080 else
3081 fprintf(o->file, "* Unmerged path %s\n", name);
3082 }
3083
3084 static void diff_fill_sha1_info(struct diff_filespec *one)
3085 {
3086 if (DIFF_FILE_VALID(one)) {
3087 if (!one->sha1_valid) {
3088 struct stat st;
3089 if (one->is_stdin) {
3090 hashcpy(one->sha1, null_sha1);
3091 return;
3092 }
3093 if (lstat(one->path, &st) < 0)
3094 die_errno("stat '%s'", one->path);
3095 if (index_path(one->sha1, one->path, &st, 0))
3096 die("cannot hash %s", one->path);
3097 }
3098 }
3099 else
3100 hashclr(one->sha1);
3101 }
3102
3103 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3104 {
3105 /* Strip the prefix but do not molest /dev/null and absolute paths */
3106 if (*namep && **namep != '/') {
3107 *namep += prefix_length;
3108 if (**namep == '/')
3109 ++*namep;
3110 }
3111 if (*otherp && **otherp != '/') {
3112 *otherp += prefix_length;
3113 if (**otherp == '/')
3114 ++*otherp;
3115 }
3116 }
3117
3118 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3119 {
3120 const char *pgm = external_diff();
3121 struct strbuf msg;
3122 struct diff_filespec *one = p->one;
3123 struct diff_filespec *two = p->two;
3124 const char *name;
3125 const char *other;
3126 const char *attr_path;
3127
3128 name = p->one->path;
3129 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3130 attr_path = name;
3131 if (o->prefix_length)
3132 strip_prefix(o->prefix_length, &name, &other);
3133
3134 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3135 pgm = NULL;
3136
3137 if (DIFF_PAIR_UNMERGED(p)) {
3138 run_diff_cmd(pgm, name, NULL, attr_path,
3139 NULL, NULL, NULL, o, p);
3140 return;
3141 }
3142
3143 diff_fill_sha1_info(one);
3144 diff_fill_sha1_info(two);
3145
3146 if (!pgm &&
3147 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3148 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3149 /*
3150 * a filepair that changes between file and symlink
3151 * needs to be split into deletion and creation.
3152 */
3153 struct diff_filespec *null = alloc_filespec(two->path);
3154 run_diff_cmd(NULL, name, other, attr_path,
3155 one, null, &msg, o, p);
3156 free(null);
3157 strbuf_release(&msg);
3158
3159 null = alloc_filespec(one->path);
3160 run_diff_cmd(NULL, name, other, attr_path,
3161 null, two, &msg, o, p);
3162 free(null);
3163 }
3164 else
3165 run_diff_cmd(pgm, name, other, attr_path,
3166 one, two, &msg, o, p);
3167
3168 strbuf_release(&msg);
3169 }
3170
3171 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3172 struct diffstat_t *diffstat)
3173 {
3174 const char *name;
3175 const char *other;
3176
3177 if (DIFF_PAIR_UNMERGED(p)) {
3178 /* unmerged */
3179 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3180 return;
3181 }
3182
3183 name = p->one->path;
3184 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3185
3186 if (o->prefix_length)
3187 strip_prefix(o->prefix_length, &name, &other);
3188
3189 diff_fill_sha1_info(p->one);
3190 diff_fill_sha1_info(p->two);
3191
3192 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3193 }
3194
3195 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3196 {
3197 const char *name;
3198 const char *other;
3199 const char *attr_path;
3200
3201 if (DIFF_PAIR_UNMERGED(p)) {
3202 /* unmerged */
3203 return;
3204 }
3205
3206 name = p->one->path;
3207 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3208 attr_path = other ? other : name;
3209
3210 if (o->prefix_length)
3211 strip_prefix(o->prefix_length, &name, &other);
3212
3213 diff_fill_sha1_info(p->one);
3214 diff_fill_sha1_info(p->two);
3215
3216 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3217 }
3218
3219 void diff_setup(struct diff_options *options)
3220 {
3221 memcpy(options, &default_diff_options, sizeof(*options));
3222
3223 options->file = stdout;
3224
3225 options->line_termination = '\n';
3226 options->break_opt = -1;
3227 options->rename_limit = -1;
3228 options->dirstat_permille = diff_dirstat_permille_default;
3229 options->context = diff_context_default;
3230 DIFF_OPT_SET(options, RENAME_EMPTY);
3231
3232 /* pathchange left =NULL by default */
3233 options->change = diff_change;
3234 options->add_remove = diff_addremove;
3235 options->use_color = diff_use_color_default;
3236 options->detect_rename = diff_detect_rename_default;
3237 options->xdl_opts |= diff_algorithm;
3238
3239 options->orderfile = diff_order_file_cfg;
3240
3241 if (diff_no_prefix) {
3242 options->a_prefix = options->b_prefix = "";
3243 } else if (!diff_mnemonic_prefix) {
3244 options->a_prefix = "a/";
3245 options->b_prefix = "b/";
3246 }
3247 }
3248
3249 void diff_setup_done(struct diff_options *options)
3250 {
3251 int count = 0;
3252
3253 if (options->set_default)
3254 options->set_default(options);
3255
3256 if (options->output_format & DIFF_FORMAT_NAME)
3257 count++;
3258 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3259 count++;
3260 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3261 count++;
3262 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3263 count++;
3264 if (count > 1)
3265 die("--name-only, --name-status, --check and -s are mutually exclusive");
3266
3267 /*
3268 * Most of the time we can say "there are changes"
3269 * only by checking if there are changed paths, but
3270 * --ignore-whitespace* options force us to look
3271 * inside contents.
3272 */
3273
3274 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3275 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3276 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3277 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3278 else
3279 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3280
3281 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3282 options->detect_rename = DIFF_DETECT_COPY;
3283
3284 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3285 options->prefix = NULL;
3286 if (options->prefix)
3287 options->prefix_length = strlen(options->prefix);
3288 else
3289 options->prefix_length = 0;
3290
3291 if (options->output_format & (DIFF_FORMAT_NAME |
3292 DIFF_FORMAT_NAME_STATUS |
3293 DIFF_FORMAT_CHECKDIFF |
3294 DIFF_FORMAT_NO_OUTPUT))
3295 options->output_format &= ~(DIFF_FORMAT_RAW |
3296 DIFF_FORMAT_NUMSTAT |
3297 DIFF_FORMAT_DIFFSTAT |
3298 DIFF_FORMAT_SHORTSTAT |
3299 DIFF_FORMAT_DIRSTAT |
3300 DIFF_FORMAT_SUMMARY |
3301 DIFF_FORMAT_PATCH);
3302
3303 /*
3304 * These cases always need recursive; we do not drop caller-supplied
3305 * recursive bits for other formats here.
3306 */
3307 if (options->output_format & (DIFF_FORMAT_PATCH |
3308 DIFF_FORMAT_NUMSTAT |
3309 DIFF_FORMAT_DIFFSTAT |
3310 DIFF_FORMAT_SHORTSTAT |
3311 DIFF_FORMAT_DIRSTAT |
3312 DIFF_FORMAT_SUMMARY |
3313 DIFF_FORMAT_CHECKDIFF))
3314 DIFF_OPT_SET(options, RECURSIVE);
3315 /*
3316 * Also pickaxe would not work very well if you do not say recursive
3317 */
3318 if (options->pickaxe)
3319 DIFF_OPT_SET(options, RECURSIVE);
3320 /*
3321 * When patches are generated, submodules diffed against the work tree
3322 * must be checked for dirtiness too so it can be shown in the output
3323 */
3324 if (options->output_format & DIFF_FORMAT_PATCH)
3325 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3326
3327 if (options->detect_rename && options->rename_limit < 0)
3328 options->rename_limit = diff_rename_limit_default;
3329 if (options->setup & DIFF_SETUP_USE_CACHE) {
3330 if (!active_cache)
3331 /* read-cache does not die even when it fails
3332 * so it is safe for us to do this here. Also
3333 * it does not smudge active_cache or active_nr
3334 * when it fails, so we do not have to worry about
3335 * cleaning it up ourselves either.
3336 */
3337 read_cache();
3338 }
3339 if (options->abbrev <= 0 || 40 < options->abbrev)
3340 options->abbrev = 40; /* full */
3341
3342 /*
3343 * It does not make sense to show the first hit we happened
3344 * to have found. It does not make sense not to return with
3345 * exit code in such a case either.
3346 */
3347 if (DIFF_OPT_TST(options, QUICK)) {
3348 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3349 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3350 }
3351
3352 options->diff_path_counter = 0;
3353
3354 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3355 die(_("--follow requires exactly one pathspec"));
3356 }
3357
3358 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3359 {
3360 char c, *eq;
3361 int len;
3362
3363 if (*arg != '-')
3364 return 0;
3365 c = *++arg;
3366 if (!c)
3367 return 0;
3368 if (c == arg_short) {
3369 c = *++arg;
3370 if (!c)
3371 return 1;
3372 if (val && isdigit(c)) {
3373 char *end;
3374 int n = strtoul(arg, &end, 10);
3375 if (*end)
3376 return 0;
3377 *val = n;
3378 return 1;
3379 }
3380 return 0;
3381 }
3382 if (c != '-')
3383 return 0;
3384 arg++;
3385 eq = strchrnul(arg, '=');
3386 len = eq - arg;
3387 if (!len || strncmp(arg, arg_long, len))
3388 return 0;
3389 if (*eq) {
3390 int n;
3391 char *end;
3392 if (!isdigit(*++eq))
3393 return 0;
3394 n = strtoul(eq, &end, 10);
3395 if (*end)
3396 return 0;
3397 *val = n;
3398 }
3399 return 1;
3400 }
3401
3402 static int diff_scoreopt_parse(const char *opt);
3403
3404 static inline int short_opt(char opt, const char **argv,
3405 const char **optarg)
3406 {
3407 const char *arg = argv[0];
3408 if (arg[0] != '-' || arg[1] != opt)
3409 return 0;
3410 if (arg[2] != '\0') {
3411 *optarg = arg + 2;
3412 return 1;
3413 }
3414 if (!argv[1])
3415 die("Option '%c' requires a value", opt);
3416 *optarg = argv[1];
3417 return 2;
3418 }
3419
3420 int parse_long_opt(const char *opt, const char **argv,
3421 const char **optarg)
3422 {
3423 const char *arg = argv[0];
3424 if (!skip_prefix(arg, "--", &arg))
3425 return 0;
3426 if (!skip_prefix(arg, opt, &arg))
3427 return 0;
3428 if (*arg == '=') { /* stuck form: --option=value */
3429 *optarg = arg + 1;
3430 return 1;
3431 }
3432 if (*arg != '\0')
3433 return 0;
3434 /* separate form: --option value */
3435 if (!argv[1])
3436 die("Option '--%s' requires a value", opt);
3437 *optarg = argv[1];
3438 return 2;
3439 }
3440
3441 static int stat_opt(struct diff_options *options, const char **av)
3442 {
3443 const char *arg = av[0];
3444 char *end;
3445 int width = options->stat_width;
3446 int name_width = options->stat_name_width;
3447 int graph_width = options->stat_graph_width;
3448 int count = options->stat_count;
3449 int argcount = 1;
3450
3451 if (!skip_prefix(arg, "--stat", &arg))
3452 die("BUG: stat option does not begin with --stat: %s", arg);
3453 end = (char *)arg;
3454
3455 switch (*arg) {
3456 case '-':
3457 if (skip_prefix(arg, "-width", &arg)) {
3458 if (*arg == '=')
3459 width = strtoul(arg + 1, &end, 10);
3460 else if (!*arg && !av[1])
3461 die("Option '--stat-width' requires a value");
3462 else if (!*arg) {
3463 width = strtoul(av[1], &end, 10);
3464 argcount = 2;
3465 }
3466 } else if (skip_prefix(arg, "-name-width", &arg)) {
3467 if (*arg == '=')
3468 name_width = strtoul(arg + 1, &end, 10);
3469 else if (!*arg && !av[1])
3470 die("Option '--stat-name-width' requires a value");
3471 else if (!*arg) {
3472 name_width = strtoul(av[1], &end, 10);
3473 argcount = 2;
3474 }
3475 } else if (skip_prefix(arg, "-graph-width", &arg)) {
3476 if (*arg == '=')
3477 graph_width = strtoul(arg + 1, &end, 10);
3478 else if (!*arg && !av[1])
3479 die("Option '--stat-graph-width' requires a value");
3480 else if (!*arg) {
3481 graph_width = strtoul(av[1], &end, 10);
3482 argcount = 2;
3483 }
3484 } else if (skip_prefix(arg, "-count", &arg)) {
3485 if (*arg == '=')
3486 count = strtoul(arg + 1, &end, 10);
3487 else if (!*arg && !av[1])
3488 die("Option '--stat-count' requires a value");
3489 else if (!*arg) {
3490 count = strtoul(av[1], &end, 10);
3491 argcount = 2;
3492 }
3493 }
3494 break;
3495 case '=':
3496 width = strtoul(arg+1, &end, 10);
3497 if (*end == ',')
3498 name_width = strtoul(end+1, &end, 10);
3499 if (*end == ',')
3500 count = strtoul(end+1, &end, 10);
3501 }
3502
3503 /* Important! This checks all the error cases! */
3504 if (*end)
3505 return 0;
3506 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3507 options->stat_name_width = name_width;
3508 options->stat_graph_width = graph_width;
3509 options->stat_width = width;
3510 options->stat_count = count;
3511 return argcount;
3512 }
3513
3514 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3515 {
3516 struct strbuf errmsg = STRBUF_INIT;
3517 if (parse_dirstat_params(options, params, &errmsg))
3518 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3519 errmsg.buf);
3520 strbuf_release(&errmsg);
3521 /*
3522 * The caller knows a dirstat-related option is given from the command
3523 * line; allow it to say "return this_function();"
3524 */
3525 options->output_format |= DIFF_FORMAT_DIRSTAT;
3526 return 1;
3527 }
3528
3529 static int parse_submodule_opt(struct diff_options *options, const char *value)
3530 {
3531 if (parse_submodule_params(options, value))
3532 die(_("Failed to parse --submodule option parameter: '%s'"),
3533 value);
3534 return 1;
3535 }
3536
3537 static const char diff_status_letters[] = {
3538 DIFF_STATUS_ADDED,
3539 DIFF_STATUS_COPIED,
3540 DIFF_STATUS_DELETED,
3541 DIFF_STATUS_MODIFIED,
3542 DIFF_STATUS_RENAMED,
3543 DIFF_STATUS_TYPE_CHANGED,
3544 DIFF_STATUS_UNKNOWN,
3545 DIFF_STATUS_UNMERGED,
3546 DIFF_STATUS_FILTER_AON,
3547 DIFF_STATUS_FILTER_BROKEN,
3548 '\0',
3549 };
3550
3551 static unsigned int filter_bit['Z' + 1];
3552
3553 static void prepare_filter_bits(void)
3554 {
3555 int i;
3556
3557 if (!filter_bit[DIFF_STATUS_ADDED]) {
3558 for (i = 0; diff_status_letters[i]; i++)
3559 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3560 }
3561 }
3562
3563 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3564 {
3565 return opt->filter & filter_bit[(int) status];
3566 }
3567
3568 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3569 {
3570 int i, optch;
3571
3572 prepare_filter_bits();
3573
3574 /*
3575 * If there is a negation e.g. 'd' in the input, and we haven't
3576 * initialized the filter field with another --diff-filter, start
3577 * from full set of bits, except for AON.
3578 */
3579 if (!opt->filter) {
3580 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3581 if (optch < 'a' || 'z' < optch)
3582 continue;
3583 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3584 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3585 break;
3586 }
3587 }
3588
3589 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3590 unsigned int bit;
3591 int negate;
3592
3593 if ('a' <= optch && optch <= 'z') {
3594 negate = 1;
3595 optch = toupper(optch);
3596 } else {
3597 negate = 0;
3598 }
3599
3600 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3601 if (!bit)
3602 return optarg[i];
3603 if (negate)
3604 opt->filter &= ~bit;
3605 else
3606 opt->filter |= bit;
3607 }
3608 return 0;
3609 }
3610
3611 static void enable_patch_output(int *fmt) {
3612 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3613 *fmt |= DIFF_FORMAT_PATCH;
3614 }
3615
3616 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3617 {
3618 const char *arg = av[0];
3619 const char *optarg;
3620 int argcount;
3621
3622 /* Output format options */
3623 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3624 || opt_arg(arg, 'U', "unified", &options->context))
3625 enable_patch_output(&options->output_format);
3626 else if (!strcmp(arg, "--raw"))
3627 options->output_format |= DIFF_FORMAT_RAW;
3628 else if (!strcmp(arg, "--patch-with-raw")) {
3629 enable_patch_output(&options->output_format);
3630 options->output_format |= DIFF_FORMAT_RAW;
3631 } else if (!strcmp(arg, "--numstat"))
3632 options->output_format |= DIFF_FORMAT_NUMSTAT;
3633 else if (!strcmp(arg, "--shortstat"))
3634 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3635 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3636 return parse_dirstat_opt(options, "");
3637 else if (skip_prefix(arg, "-X", &arg))
3638 return parse_dirstat_opt(options, arg);
3639 else if (skip_prefix(arg, "--dirstat=", &arg))
3640 return parse_dirstat_opt(options, arg);
3641 else if (!strcmp(arg, "--cumulative"))
3642 return parse_dirstat_opt(options, "cumulative");
3643 else if (!strcmp(arg, "--dirstat-by-file"))
3644 return parse_dirstat_opt(options, "files");
3645 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
3646 parse_dirstat_opt(options, "files");
3647 return parse_dirstat_opt(options, arg);
3648 }
3649 else if (!strcmp(arg, "--check"))
3650 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3651 else if (!strcmp(arg, "--summary"))
3652 options->output_format |= DIFF_FORMAT_SUMMARY;
3653 else if (!strcmp(arg, "--patch-with-stat")) {
3654 enable_patch_output(&options->output_format);
3655 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3656 } else if (!strcmp(arg, "--name-only"))
3657 options->output_format |= DIFF_FORMAT_NAME;
3658 else if (!strcmp(arg, "--name-status"))
3659 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3660 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3661 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3662 else if (starts_with(arg, "--stat"))
3663 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3664 return stat_opt(options, av);
3665
3666 /* renames options */
3667 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3668 !strcmp(arg, "--break-rewrites")) {
3669 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3670 return error("invalid argument to -B: %s", arg+2);
3671 }
3672 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3673 !strcmp(arg, "--find-renames")) {
3674 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3675 return error("invalid argument to -M: %s", arg+2);
3676 options->detect_rename = DIFF_DETECT_RENAME;
3677 }
3678 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3679 options->irreversible_delete = 1;
3680 }
3681 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3682 !strcmp(arg, "--find-copies")) {
3683 if (options->detect_rename == DIFF_DETECT_COPY)
3684 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3685 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3686 return error("invalid argument to -C: %s", arg+2);
3687 options->detect_rename = DIFF_DETECT_COPY;
3688 }
3689 else if (!strcmp(arg, "--no-renames"))
3690 options->detect_rename = 0;
3691 else if (!strcmp(arg, "--rename-empty"))
3692 DIFF_OPT_SET(options, RENAME_EMPTY);
3693 else if (!strcmp(arg, "--no-rename-empty"))
3694 DIFF_OPT_CLR(options, RENAME_EMPTY);
3695 else if (!strcmp(arg, "--relative"))
3696 DIFF_OPT_SET(options, RELATIVE_NAME);
3697 else if (skip_prefix(arg, "--relative=", &arg)) {
3698 DIFF_OPT_SET(options, RELATIVE_NAME);
3699 options->prefix = arg;
3700 }
3701
3702 /* xdiff options */
3703 else if (!strcmp(arg, "--minimal"))
3704 DIFF_XDL_SET(options, NEED_MINIMAL);
3705 else if (!strcmp(arg, "--no-minimal"))
3706 DIFF_XDL_CLR(options, NEED_MINIMAL);
3707 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3708 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3709 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3710 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3711 else if (!strcmp(arg, "--ignore-space-at-eol"))
3712 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3713 else if (!strcmp(arg, "--ignore-blank-lines"))
3714 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3715 else if (!strcmp(arg, "--patience"))
3716 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3717 else if (!strcmp(arg, "--histogram"))
3718 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3719 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3720 long value = parse_algorithm_value(optarg);
3721 if (value < 0)
3722 return error("option diff-algorithm accepts \"myers\", "
3723 "\"minimal\", \"patience\" and \"histogram\"");
3724 /* clear out previous settings */
3725 DIFF_XDL_CLR(options, NEED_MINIMAL);
3726 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3727 options->xdl_opts |= value;
3728 return argcount;
3729 }
3730
3731 /* flags options */
3732 else if (!strcmp(arg, "--binary")) {
3733 enable_patch_output(&options->output_format);
3734 DIFF_OPT_SET(options, BINARY);
3735 }
3736 else if (!strcmp(arg, "--full-index"))
3737 DIFF_OPT_SET(options, FULL_INDEX);
3738 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3739 DIFF_OPT_SET(options, TEXT);
3740 else if (!strcmp(arg, "-R"))
3741 DIFF_OPT_SET(options, REVERSE_DIFF);
3742 else if (!strcmp(arg, "--find-copies-harder"))
3743 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3744 else if (!strcmp(arg, "--follow"))
3745 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3746 else if (!strcmp(arg, "--no-follow"))
3747 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3748 else if (!strcmp(arg, "--color"))
3749 options->use_color = 1;
3750 else if (skip_prefix(arg, "--color=", &arg)) {
3751 int value = git_config_colorbool(NULL, arg);
3752 if (value < 0)
3753 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3754 options->use_color = value;
3755 }
3756 else if (!strcmp(arg, "--no-color"))
3757 options->use_color = 0;
3758 else if (!strcmp(arg, "--color-words")) {
3759 options->use_color = 1;
3760 options->word_diff = DIFF_WORDS_COLOR;
3761 }
3762 else if (skip_prefix(arg, "--color-words=", &arg)) {
3763 options->use_color = 1;
3764 options->word_diff = DIFF_WORDS_COLOR;
3765 options->word_regex = arg;
3766 }
3767 else if (!strcmp(arg, "--word-diff")) {
3768 if (options->word_diff == DIFF_WORDS_NONE)
3769 options->word_diff = DIFF_WORDS_PLAIN;
3770 }
3771 else if (skip_prefix(arg, "--word-diff=", &arg)) {
3772 if (!strcmp(arg, "plain"))
3773 options->word_diff = DIFF_WORDS_PLAIN;
3774 else if (!strcmp(arg, "color")) {
3775 options->use_color = 1;
3776 options->word_diff = DIFF_WORDS_COLOR;
3777 }
3778 else if (!strcmp(arg, "porcelain"))
3779 options->word_diff = DIFF_WORDS_PORCELAIN;
3780 else if (!strcmp(arg, "none"))
3781 options->word_diff = DIFF_WORDS_NONE;
3782 else
3783 die("bad --word-diff argument: %s", arg);
3784 }
3785 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3786 if (options->word_diff == DIFF_WORDS_NONE)
3787 options->word_diff = DIFF_WORDS_PLAIN;
3788 options->word_regex = optarg;
3789 return argcount;
3790 }
3791 else if (!strcmp(arg, "--exit-code"))
3792 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3793 else if (!strcmp(arg, "--quiet"))
3794 DIFF_OPT_SET(options, QUICK);
3795 else if (!strcmp(arg, "--ext-diff"))
3796 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3797 else if (!strcmp(arg, "--no-ext-diff"))
3798 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3799 else if (!strcmp(arg, "--textconv"))
3800 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3801 else if (!strcmp(arg, "--no-textconv"))
3802 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3803 else if (!strcmp(arg, "--ignore-submodules")) {
3804 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3805 handle_ignore_submodules_arg(options, "all");
3806 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
3807 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3808 handle_ignore_submodules_arg(options, arg);
3809 } else if (!strcmp(arg, "--submodule"))
3810 DIFF_OPT_SET(options, SUBMODULE_LOG);
3811 else if (skip_prefix(arg, "--submodule=", &arg))
3812 return parse_submodule_opt(options, arg);
3813
3814 /* misc options */
3815 else if (!strcmp(arg, "-z"))
3816 options->line_termination = 0;
3817 else if ((argcount = short_opt('l', av, &optarg))) {
3818 options->rename_limit = strtoul(optarg, NULL, 10);
3819 return argcount;
3820 }
3821 else if ((argcount = short_opt('S', av, &optarg))) {
3822 options->pickaxe = optarg;
3823 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3824 return argcount;
3825 } else if ((argcount = short_opt('G', av, &optarg))) {
3826 options->pickaxe = optarg;
3827 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3828 return argcount;
3829 }
3830 else if (!strcmp(arg, "--pickaxe-all"))
3831 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3832 else if (!strcmp(arg, "--pickaxe-regex"))
3833 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3834 else if ((argcount = short_opt('O', av, &optarg))) {
3835 options->orderfile = optarg;
3836 return argcount;
3837 }
3838 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3839 int offending = parse_diff_filter_opt(optarg, options);
3840 if (offending)
3841 die("unknown change class '%c' in --diff-filter=%s",
3842 offending, optarg);
3843 return argcount;
3844 }
3845 else if (!strcmp(arg, "--abbrev"))
3846 options->abbrev = DEFAULT_ABBREV;
3847 else if (skip_prefix(arg, "--abbrev=", &arg)) {
3848 options->abbrev = strtoul(arg, NULL, 10);
3849 if (options->abbrev < MINIMUM_ABBREV)
3850 options->abbrev = MINIMUM_ABBREV;
3851 else if (40 < options->abbrev)
3852 options->abbrev = 40;
3853 }
3854 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3855 options->a_prefix = optarg;
3856 return argcount;
3857 }
3858 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3859 options->b_prefix = optarg;
3860 return argcount;
3861 }
3862 else if (!strcmp(arg, "--no-prefix"))
3863 options->a_prefix = options->b_prefix = "";
3864 else if (opt_arg(arg, '\0', "inter-hunk-context",
3865 &options->interhunkcontext))
3866 ;
3867 else if (!strcmp(arg, "-W"))
3868 DIFF_OPT_SET(options, FUNCCONTEXT);
3869 else if (!strcmp(arg, "--function-context"))
3870 DIFF_OPT_SET(options, FUNCCONTEXT);
3871 else if (!strcmp(arg, "--no-function-context"))
3872 DIFF_OPT_CLR(options, FUNCCONTEXT);
3873 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3874 options->file = fopen(optarg, "w");
3875 if (!options->file)
3876 die_errno("Could not open '%s'", optarg);
3877 options->close_file = 1;
3878 return argcount;
3879 } else
3880 return 0;
3881 return 1;
3882 }
3883
3884 int parse_rename_score(const char **cp_p)
3885 {
3886 unsigned long num, scale;
3887 int ch, dot;
3888 const char *cp = *cp_p;
3889
3890 num = 0;
3891 scale = 1;
3892 dot = 0;
3893 for (;;) {
3894 ch = *cp;
3895 if ( !dot && ch == '.' ) {
3896 scale = 1;
3897 dot = 1;
3898 } else if ( ch == '%' ) {
3899 scale = dot ? scale*100 : 100;
3900 cp++; /* % is always at the end */
3901 break;
3902 } else if ( ch >= '0' && ch <= '9' ) {
3903 if ( scale < 100000 ) {
3904 scale *= 10;
3905 num = (num*10) + (ch-'0');
3906 }
3907 } else {
3908 break;
3909 }
3910 cp++;
3911 }
3912 *cp_p = cp;
3913
3914 /* user says num divided by scale and we say internally that
3915 * is MAX_SCORE * num / scale.
3916 */
3917 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3918 }
3919
3920 static int diff_scoreopt_parse(const char *opt)
3921 {
3922 int opt1, opt2, cmd;
3923
3924 if (*opt++ != '-')
3925 return -1;
3926 cmd = *opt++;
3927 if (cmd == '-') {
3928 /* convert the long-form arguments into short-form versions */
3929 if (skip_prefix(opt, "break-rewrites", &opt)) {
3930 if (*opt == 0 || *opt++ == '=')
3931 cmd = 'B';
3932 } else if (skip_prefix(opt, "find-copies", &opt)) {
3933 if (*opt == 0 || *opt++ == '=')
3934 cmd = 'C';
3935 } else if (skip_prefix(opt, "find-renames", &opt)) {
3936 if (*opt == 0 || *opt++ == '=')
3937 cmd = 'M';
3938 }
3939 }
3940 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3941 return -1; /* that is not a -M, -C, or -B option */
3942
3943 opt1 = parse_rename_score(&opt);
3944 if (cmd != 'B')
3945 opt2 = 0;
3946 else {
3947 if (*opt == 0)
3948 opt2 = 0;
3949 else if (*opt != '/')
3950 return -1; /* we expect -B80/99 or -B80 */
3951 else {
3952 opt++;
3953 opt2 = parse_rename_score(&opt);
3954 }
3955 }
3956 if (*opt != 0)
3957 return -1;
3958 return opt1 | (opt2 << 16);
3959 }
3960
3961 struct diff_queue_struct diff_queued_diff;
3962
3963 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3964 {
3965 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
3966 queue->queue[queue->nr++] = dp;
3967 }
3968
3969 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3970 struct diff_filespec *one,
3971 struct diff_filespec *two)
3972 {
3973 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3974 dp->one = one;
3975 dp->two = two;
3976 if (queue)
3977 diff_q(queue, dp);
3978 return dp;
3979 }
3980
3981 void diff_free_filepair(struct diff_filepair *p)
3982 {
3983 free_filespec(p->one);
3984 free_filespec(p->two);
3985 free(p);
3986 }
3987
3988 /* This is different from find_unique_abbrev() in that
3989 * it stuffs the result with dots for alignment.
3990 */
3991 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3992 {
3993 int abblen;
3994 const char *abbrev;
3995 if (len == 40)
3996 return sha1_to_hex(sha1);
3997
3998 abbrev = find_unique_abbrev(sha1, len);
3999 abblen = strlen(abbrev);
4000 if (abblen < 37) {
4001 static char hex[41];
4002 if (len < abblen && abblen <= len + 2)
4003 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
4004 else
4005 sprintf(hex, "%s...", abbrev);
4006 return hex;
4007 }
4008 return sha1_to_hex(sha1);
4009 }
4010
4011 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4012 {
4013 int line_termination = opt->line_termination;
4014 int inter_name_termination = line_termination ? '\t' : '\0';
4015
4016 fprintf(opt->file, "%s", diff_line_prefix(opt));
4017 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4018 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4019 diff_unique_abbrev(p->one->sha1, opt->abbrev));
4020 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
4021 }
4022 if (p->score) {
4023 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4024 inter_name_termination);
4025 } else {
4026 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4027 }
4028
4029 if (p->status == DIFF_STATUS_COPIED ||
4030 p->status == DIFF_STATUS_RENAMED) {
4031 const char *name_a, *name_b;
4032 name_a = p->one->path;
4033 name_b = p->two->path;
4034 strip_prefix(opt->prefix_length, &name_a, &name_b);
4035 write_name_quoted(name_a, opt->file, inter_name_termination);
4036 write_name_quoted(name_b, opt->file, line_termination);
4037 } else {
4038 const char *name_a, *name_b;
4039 name_a = p->one->mode ? p->one->path : p->two->path;
4040 name_b = NULL;
4041 strip_prefix(opt->prefix_length, &name_a, &name_b);
4042 write_name_quoted(name_a, opt->file, line_termination);
4043 }
4044 }
4045
4046 int diff_unmodified_pair(struct diff_filepair *p)
4047 {
4048 /* This function is written stricter than necessary to support
4049 * the currently implemented transformers, but the idea is to
4050 * let transformers to produce diff_filepairs any way they want,
4051 * and filter and clean them up here before producing the output.
4052 */
4053 struct diff_filespec *one = p->one, *two = p->two;
4054
4055 if (DIFF_PAIR_UNMERGED(p))
4056 return 0; /* unmerged is interesting */
4057
4058 /* deletion, addition, mode or type change
4059 * and rename are all interesting.
4060 */
4061 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4062 DIFF_PAIR_MODE_CHANGED(p) ||
4063 strcmp(one->path, two->path))
4064 return 0;
4065
4066 /* both are valid and point at the same path. that is, we are
4067 * dealing with a change.
4068 */
4069 if (one->sha1_valid && two->sha1_valid &&
4070 !hashcmp(one->sha1, two->sha1) &&
4071 !one->dirty_submodule && !two->dirty_submodule)
4072 return 1; /* no change */
4073 if (!one->sha1_valid && !two->sha1_valid)
4074 return 1; /* both look at the same file on the filesystem. */
4075 return 0;
4076 }
4077
4078 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4079 {
4080 if (diff_unmodified_pair(p))
4081 return;
4082
4083 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4084 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4085 return; /* no tree diffs in patch format */
4086
4087 run_diff(p, o);
4088 }
4089
4090 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4091 struct diffstat_t *diffstat)
4092 {
4093 if (diff_unmodified_pair(p))
4094 return;
4095
4096 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4097 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4098 return; /* no useful stat for tree diffs */
4099
4100 run_diffstat(p, o, diffstat);
4101 }
4102
4103 static void diff_flush_checkdiff(struct diff_filepair *p,
4104 struct diff_options *o)
4105 {
4106 if (diff_unmodified_pair(p))
4107 return;
4108
4109 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4110 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4111 return; /* nothing to check in tree diffs */
4112
4113 run_checkdiff(p, o);
4114 }
4115
4116 int diff_queue_is_empty(void)
4117 {
4118 struct diff_queue_struct *q = &diff_queued_diff;
4119 int i;
4120 for (i = 0; i < q->nr; i++)
4121 if (!diff_unmodified_pair(q->queue[i]))
4122 return 0;
4123 return 1;
4124 }
4125
4126 #if DIFF_DEBUG
4127 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4128 {
4129 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4130 x, one ? one : "",
4131 s->path,
4132 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4133 s->mode,
4134 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4135 fprintf(stderr, "queue[%d] %s size %lu\n",
4136 x, one ? one : "",
4137 s->size);
4138 }
4139
4140 void diff_debug_filepair(const struct diff_filepair *p, int i)
4141 {
4142 diff_debug_filespec(p->one, i, "one");
4143 diff_debug_filespec(p->two, i, "two");
4144 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4145 p->score, p->status ? p->status : '?',
4146 p->one->rename_used, p->broken_pair);
4147 }
4148
4149 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4150 {
4151 int i;
4152 if (msg)
4153 fprintf(stderr, "%s\n", msg);
4154 fprintf(stderr, "q->nr = %d\n", q->nr);
4155 for (i = 0; i < q->nr; i++) {
4156 struct diff_filepair *p = q->queue[i];
4157 diff_debug_filepair(p, i);
4158 }
4159 }
4160 #endif
4161
4162 static void diff_resolve_rename_copy(void)
4163 {
4164 int i;
4165 struct diff_filepair *p;
4166 struct diff_queue_struct *q = &diff_queued_diff;
4167
4168 diff_debug_queue("resolve-rename-copy", q);
4169
4170 for (i = 0; i < q->nr; i++) {
4171 p = q->queue[i];
4172 p->status = 0; /* undecided */
4173 if (DIFF_PAIR_UNMERGED(p))
4174 p->status = DIFF_STATUS_UNMERGED;
4175 else if (!DIFF_FILE_VALID(p->one))
4176 p->status = DIFF_STATUS_ADDED;
4177 else if (!DIFF_FILE_VALID(p->two))
4178 p->status = DIFF_STATUS_DELETED;
4179 else if (DIFF_PAIR_TYPE_CHANGED(p))
4180 p->status = DIFF_STATUS_TYPE_CHANGED;
4181
4182 /* from this point on, we are dealing with a pair
4183 * whose both sides are valid and of the same type, i.e.
4184 * either in-place edit or rename/copy edit.
4185 */
4186 else if (DIFF_PAIR_RENAME(p)) {
4187 /*
4188 * A rename might have re-connected a broken
4189 * pair up, causing the pathnames to be the
4190 * same again. If so, that's not a rename at
4191 * all, just a modification..
4192 *
4193 * Otherwise, see if this source was used for
4194 * multiple renames, in which case we decrement
4195 * the count, and call it a copy.
4196 */
4197 if (!strcmp(p->one->path, p->two->path))
4198 p->status = DIFF_STATUS_MODIFIED;
4199 else if (--p->one->rename_used > 0)
4200 p->status = DIFF_STATUS_COPIED;
4201 else
4202 p->status = DIFF_STATUS_RENAMED;
4203 }
4204 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4205 p->one->mode != p->two->mode ||
4206 p->one->dirty_submodule ||
4207 p->two->dirty_submodule ||
4208 is_null_sha1(p->one->sha1))
4209 p->status = DIFF_STATUS_MODIFIED;
4210 else {
4211 /* This is a "no-change" entry and should not
4212 * happen anymore, but prepare for broken callers.
4213 */
4214 error("feeding unmodified %s to diffcore",
4215 p->one->path);
4216 p->status = DIFF_STATUS_UNKNOWN;
4217 }
4218 }
4219 diff_debug_queue("resolve-rename-copy done", q);
4220 }
4221
4222 static int check_pair_status(struct diff_filepair *p)
4223 {
4224 switch (p->status) {
4225 case DIFF_STATUS_UNKNOWN:
4226 return 0;
4227 case 0:
4228 die("internal error in diff-resolve-rename-copy");
4229 default:
4230 return 1;
4231 }
4232 }
4233
4234 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4235 {
4236 int fmt = opt->output_format;
4237
4238 if (fmt & DIFF_FORMAT_CHECKDIFF)
4239 diff_flush_checkdiff(p, opt);
4240 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4241 diff_flush_raw(p, opt);
4242 else if (fmt & DIFF_FORMAT_NAME) {
4243 const char *name_a, *name_b;
4244 name_a = p->two->path;
4245 name_b = NULL;
4246 strip_prefix(opt->prefix_length, &name_a, &name_b);
4247 write_name_quoted(name_a, opt->file, opt->line_termination);
4248 }
4249 }
4250
4251 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4252 {
4253 if (fs->mode)
4254 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4255 else
4256 fprintf(file, " %s ", newdelete);
4257 write_name_quoted(fs->path, file, '\n');
4258 }
4259
4260
4261 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4262 const char *line_prefix)
4263 {
4264 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4265 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4266 p->two->mode, show_name ? ' ' : '\n');
4267 if (show_name) {
4268 write_name_quoted(p->two->path, file, '\n');
4269 }
4270 }
4271 }
4272
4273 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4274 const char *line_prefix)
4275 {
4276 char *names = pprint_rename(p->one->path, p->two->path);
4277
4278 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4279 free(names);
4280 show_mode_change(file, p, 0, line_prefix);
4281 }
4282
4283 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4284 {
4285 FILE *file = opt->file;
4286 const char *line_prefix = diff_line_prefix(opt);
4287
4288 switch(p->status) {
4289 case DIFF_STATUS_DELETED:
4290 fputs(line_prefix, file);
4291 show_file_mode_name(file, "delete", p->one);
4292 break;
4293 case DIFF_STATUS_ADDED:
4294 fputs(line_prefix, file);
4295 show_file_mode_name(file, "create", p->two);
4296 break;
4297 case DIFF_STATUS_COPIED:
4298 fputs(line_prefix, file);
4299 show_rename_copy(file, "copy", p, line_prefix);
4300 break;
4301 case DIFF_STATUS_RENAMED:
4302 fputs(line_prefix, file);
4303 show_rename_copy(file, "rename", p, line_prefix);
4304 break;
4305 default:
4306 if (p->score) {
4307 fprintf(file, "%s rewrite ", line_prefix);
4308 write_name_quoted(p->two->path, file, ' ');
4309 fprintf(file, "(%d%%)\n", similarity_index(p));
4310 }
4311 show_mode_change(file, p, !p->score, line_prefix);
4312 break;
4313 }
4314 }
4315
4316 struct patch_id_t {
4317 git_SHA_CTX *ctx;
4318 int patchlen;
4319 };
4320
4321 static int remove_space(char *line, int len)
4322 {
4323 int i;
4324 char *dst = line;
4325 unsigned char c;
4326
4327 for (i = 0; i < len; i++)
4328 if (!isspace((c = line[i])))
4329 *dst++ = c;
4330
4331 return dst - line;
4332 }
4333
4334 static void patch_id_consume(void *priv, char *line, unsigned long len)
4335 {
4336 struct patch_id_t *data = priv;
4337 int new_len;
4338
4339 /* Ignore line numbers when computing the SHA1 of the patch */
4340 if (starts_with(line, "@@ -"))
4341 return;
4342
4343 new_len = remove_space(line, len);
4344
4345 git_SHA1_Update(data->ctx, line, new_len);
4346 data->patchlen += new_len;
4347 }
4348
4349 /* returns 0 upon success, and writes result into sha1 */
4350 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4351 {
4352 struct diff_queue_struct *q = &diff_queued_diff;
4353 int i;
4354 git_SHA_CTX ctx;
4355 struct patch_id_t data;
4356 char buffer[PATH_MAX * 4 + 20];
4357
4358 git_SHA1_Init(&ctx);
4359 memset(&data, 0, sizeof(struct patch_id_t));
4360 data.ctx = &ctx;
4361
4362 for (i = 0; i < q->nr; i++) {
4363 xpparam_t xpp;
4364 xdemitconf_t xecfg;
4365 mmfile_t mf1, mf2;
4366 struct diff_filepair *p = q->queue[i];
4367 int len1, len2;
4368
4369 memset(&xpp, 0, sizeof(xpp));
4370 memset(&xecfg, 0, sizeof(xecfg));
4371 if (p->status == 0)
4372 return error("internal diff status error");
4373 if (p->status == DIFF_STATUS_UNKNOWN)
4374 continue;
4375 if (diff_unmodified_pair(p))
4376 continue;
4377 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4378 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4379 continue;
4380 if (DIFF_PAIR_UNMERGED(p))
4381 continue;
4382
4383 diff_fill_sha1_info(p->one);
4384 diff_fill_sha1_info(p->two);
4385 if (fill_mmfile(&mf1, p->one) < 0 ||
4386 fill_mmfile(&mf2, p->two) < 0)
4387 return error("unable to read files to diff");
4388
4389 len1 = remove_space(p->one->path, strlen(p->one->path));
4390 len2 = remove_space(p->two->path, strlen(p->two->path));
4391 if (p->one->mode == 0)
4392 len1 = snprintf(buffer, sizeof(buffer),
4393 "diff--gita/%.*sb/%.*s"
4394 "newfilemode%06o"
4395 "---/dev/null"
4396 "+++b/%.*s",
4397 len1, p->one->path,
4398 len2, p->two->path,
4399 p->two->mode,
4400 len2, p->two->path);
4401 else if (p->two->mode == 0)
4402 len1 = snprintf(buffer, sizeof(buffer),
4403 "diff--gita/%.*sb/%.*s"
4404 "deletedfilemode%06o"
4405 "---a/%.*s"
4406 "+++/dev/null",
4407 len1, p->one->path,
4408 len2, p->two->path,
4409 p->one->mode,
4410 len1, p->one->path);
4411 else
4412 len1 = snprintf(buffer, sizeof(buffer),
4413 "diff--gita/%.*sb/%.*s"
4414 "---a/%.*s"
4415 "+++b/%.*s",
4416 len1, p->one->path,
4417 len2, p->two->path,
4418 len1, p->one->path,
4419 len2, p->two->path);
4420 git_SHA1_Update(&ctx, buffer, len1);
4421
4422 if (diff_filespec_is_binary(p->one) ||
4423 diff_filespec_is_binary(p->two)) {
4424 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4425 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4426 continue;
4427 }
4428
4429 xpp.flags = 0;
4430 xecfg.ctxlen = 3;
4431 xecfg.flags = 0;
4432 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4433 &xpp, &xecfg))
4434 return error("unable to generate patch-id diff for %s",
4435 p->one->path);
4436 }
4437
4438 git_SHA1_Final(sha1, &ctx);
4439 return 0;
4440 }
4441
4442 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4443 {
4444 struct diff_queue_struct *q = &diff_queued_diff;
4445 int i;
4446 int result = diff_get_patch_id(options, sha1);
4447
4448 for (i = 0; i < q->nr; i++)
4449 diff_free_filepair(q->queue[i]);
4450
4451 free(q->queue);
4452 DIFF_QUEUE_CLEAR(q);
4453
4454 return result;
4455 }
4456
4457 static int is_summary_empty(const struct diff_queue_struct *q)
4458 {
4459 int i;
4460
4461 for (i = 0; i < q->nr; i++) {
4462 const struct diff_filepair *p = q->queue[i];
4463
4464 switch (p->status) {
4465 case DIFF_STATUS_DELETED:
4466 case DIFF_STATUS_ADDED:
4467 case DIFF_STATUS_COPIED:
4468 case DIFF_STATUS_RENAMED:
4469 return 0;
4470 default:
4471 if (p->score)
4472 return 0;
4473 if (p->one->mode && p->two->mode &&
4474 p->one->mode != p->two->mode)
4475 return 0;
4476 break;
4477 }
4478 }
4479 return 1;
4480 }
4481
4482 static const char rename_limit_warning[] =
4483 "inexact rename detection was skipped due to too many files.";
4484
4485 static const char degrade_cc_to_c_warning[] =
4486 "only found copies from modified paths due to too many files.";
4487
4488 static const char rename_limit_advice[] =
4489 "you may want to set your %s variable to at least "
4490 "%d and retry the command.";
4491
4492 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4493 {
4494 if (degraded_cc)
4495 warning(degrade_cc_to_c_warning);
4496 else if (needed)
4497 warning(rename_limit_warning);
4498 else
4499 return;
4500 if (0 < needed && needed < 32767)
4501 warning(rename_limit_advice, varname, needed);
4502 }
4503
4504 void diff_flush(struct diff_options *options)
4505 {
4506 struct diff_queue_struct *q = &diff_queued_diff;
4507 int i, output_format = options->output_format;
4508 int separator = 0;
4509 int dirstat_by_line = 0;
4510
4511 /*
4512 * Order: raw, stat, summary, patch
4513 * or: name/name-status/checkdiff (other bits clear)
4514 */
4515 if (!q->nr)
4516 goto free_queue;
4517
4518 if (output_format & (DIFF_FORMAT_RAW |
4519 DIFF_FORMAT_NAME |
4520 DIFF_FORMAT_NAME_STATUS |
4521 DIFF_FORMAT_CHECKDIFF)) {
4522 for (i = 0; i < q->nr; i++) {
4523 struct diff_filepair *p = q->queue[i];
4524 if (check_pair_status(p))
4525 flush_one_pair(p, options);
4526 }
4527 separator++;
4528 }
4529
4530 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4531 dirstat_by_line = 1;
4532
4533 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4534 dirstat_by_line) {
4535 struct diffstat_t diffstat;
4536
4537 memset(&diffstat, 0, sizeof(struct diffstat_t));
4538 for (i = 0; i < q->nr; i++) {
4539 struct diff_filepair *p = q->queue[i];
4540 if (check_pair_status(p))
4541 diff_flush_stat(p, options, &diffstat);
4542 }
4543 if (output_format & DIFF_FORMAT_NUMSTAT)
4544 show_numstat(&diffstat, options);
4545 if (output_format & DIFF_FORMAT_DIFFSTAT)
4546 show_stats(&diffstat, options);
4547 if (output_format & DIFF_FORMAT_SHORTSTAT)
4548 show_shortstats(&diffstat, options);
4549 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
4550 show_dirstat_by_line(&diffstat, options);
4551 free_diffstat_info(&diffstat);
4552 separator++;
4553 }
4554 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4555 show_dirstat(options);
4556
4557 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4558 for (i = 0; i < q->nr; i++) {
4559 diff_summary(options, q->queue[i]);
4560 }
4561 separator++;
4562 }
4563
4564 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4565 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4566 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4567 /*
4568 * run diff_flush_patch for the exit status. setting
4569 * options->file to /dev/null should be safe, because we
4570 * aren't supposed to produce any output anyway.
4571 */
4572 if (options->close_file)
4573 fclose(options->file);
4574 options->file = fopen("/dev/null", "w");
4575 if (!options->file)
4576 die_errno("Could not open /dev/null");
4577 options->close_file = 1;
4578 for (i = 0; i < q->nr; i++) {
4579 struct diff_filepair *p = q->queue[i];
4580 if (check_pair_status(p))
4581 diff_flush_patch(p, options);
4582 if (options->found_changes)
4583 break;
4584 }
4585 }
4586
4587 if (output_format & DIFF_FORMAT_PATCH) {
4588 if (separator) {
4589 fprintf(options->file, "%s%c",
4590 diff_line_prefix(options),
4591 options->line_termination);
4592 if (options->stat_sep) {
4593 /* attach patch instead of inline */
4594 fputs(options->stat_sep, options->file);
4595 }
4596 }
4597
4598 for (i = 0; i < q->nr; i++) {
4599 struct diff_filepair *p = q->queue[i];
4600 if (check_pair_status(p))
4601 diff_flush_patch(p, options);
4602 }
4603 }
4604
4605 if (output_format & DIFF_FORMAT_CALLBACK)
4606 options->format_callback(q, options, options->format_callback_data);
4607
4608 for (i = 0; i < q->nr; i++)
4609 diff_free_filepair(q->queue[i]);
4610 free_queue:
4611 free(q->queue);
4612 DIFF_QUEUE_CLEAR(q);
4613 if (options->close_file)
4614 fclose(options->file);
4615
4616 /*
4617 * Report the content-level differences with HAS_CHANGES;
4618 * diff_addremove/diff_change does not set the bit when
4619 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4620 */
4621 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4622 if (options->found_changes)
4623 DIFF_OPT_SET(options, HAS_CHANGES);
4624 else
4625 DIFF_OPT_CLR(options, HAS_CHANGES);
4626 }
4627 }
4628
4629 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4630 {
4631 return (((p->status == DIFF_STATUS_MODIFIED) &&
4632 ((p->score &&
4633 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4634 (!p->score &&
4635 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4636 ((p->status != DIFF_STATUS_MODIFIED) &&
4637 filter_bit_tst(p->status, options)));
4638 }
4639
4640 static void diffcore_apply_filter(struct diff_options *options)
4641 {
4642 int i;
4643 struct diff_queue_struct *q = &diff_queued_diff;
4644 struct diff_queue_struct outq;
4645
4646 DIFF_QUEUE_CLEAR(&outq);
4647
4648 if (!options->filter)
4649 return;
4650
4651 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4652 int found;
4653 for (i = found = 0; !found && i < q->nr; i++) {
4654 if (match_filter(options, q->queue[i]))
4655 found++;
4656 }
4657 if (found)
4658 return;
4659
4660 /* otherwise we will clear the whole queue
4661 * by copying the empty outq at the end of this
4662 * function, but first clear the current entries
4663 * in the queue.
4664 */
4665 for (i = 0; i < q->nr; i++)
4666 diff_free_filepair(q->queue[i]);
4667 }
4668 else {
4669 /* Only the matching ones */
4670 for (i = 0; i < q->nr; i++) {
4671 struct diff_filepair *p = q->queue[i];
4672 if (match_filter(options, p))
4673 diff_q(&outq, p);
4674 else
4675 diff_free_filepair(p);
4676 }
4677 }
4678 free(q->queue);
4679 *q = outq;
4680 }
4681
4682 /* Check whether two filespecs with the same mode and size are identical */
4683 static int diff_filespec_is_identical(struct diff_filespec *one,
4684 struct diff_filespec *two)
4685 {
4686 if (S_ISGITLINK(one->mode))
4687 return 0;
4688 if (diff_populate_filespec(one, 0))
4689 return 0;
4690 if (diff_populate_filespec(two, 0))
4691 return 0;
4692 return !memcmp(one->data, two->data, one->size);
4693 }
4694
4695 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4696 {
4697 if (p->done_skip_stat_unmatch)
4698 return p->skip_stat_unmatch_result;
4699
4700 p->done_skip_stat_unmatch = 1;
4701 p->skip_stat_unmatch_result = 0;
4702 /*
4703 * 1. Entries that come from stat info dirtiness
4704 * always have both sides (iow, not create/delete),
4705 * one side of the object name is unknown, with
4706 * the same mode and size. Keep the ones that
4707 * do not match these criteria. They have real
4708 * differences.
4709 *
4710 * 2. At this point, the file is known to be modified,
4711 * with the same mode and size, and the object
4712 * name of one side is unknown. Need to inspect
4713 * the identical contents.
4714 */
4715 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4716 !DIFF_FILE_VALID(p->two) ||
4717 (p->one->sha1_valid && p->two->sha1_valid) ||
4718 (p->one->mode != p->two->mode) ||
4719 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
4720 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
4721 (p->one->size != p->two->size) ||
4722 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4723 p->skip_stat_unmatch_result = 1;
4724 return p->skip_stat_unmatch_result;
4725 }
4726
4727 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4728 {
4729 int i;
4730 struct diff_queue_struct *q = &diff_queued_diff;
4731 struct diff_queue_struct outq;
4732 DIFF_QUEUE_CLEAR(&outq);
4733
4734 for (i = 0; i < q->nr; i++) {
4735 struct diff_filepair *p = q->queue[i];
4736
4737 if (diff_filespec_check_stat_unmatch(p))
4738 diff_q(&outq, p);
4739 else {
4740 /*
4741 * The caller can subtract 1 from skip_stat_unmatch
4742 * to determine how many paths were dirty only
4743 * due to stat info mismatch.
4744 */
4745 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4746 diffopt->skip_stat_unmatch++;
4747 diff_free_filepair(p);
4748 }
4749 }
4750 free(q->queue);
4751 *q = outq;
4752 }
4753
4754 static int diffnamecmp(const void *a_, const void *b_)
4755 {
4756 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4757 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4758 const char *name_a, *name_b;
4759
4760 name_a = a->one ? a->one->path : a->two->path;
4761 name_b = b->one ? b->one->path : b->two->path;
4762 return strcmp(name_a, name_b);
4763 }
4764
4765 void diffcore_fix_diff_index(struct diff_options *options)
4766 {
4767 struct diff_queue_struct *q = &diff_queued_diff;
4768 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4769 }
4770
4771 void diffcore_std(struct diff_options *options)
4772 {
4773 /* NOTE please keep the following in sync with diff_tree_combined() */
4774 if (options->skip_stat_unmatch)
4775 diffcore_skip_stat_unmatch(options);
4776 if (!options->found_follow) {
4777 /* See try_to_follow_renames() in tree-diff.c */
4778 if (options->break_opt != -1)
4779 diffcore_break(options->break_opt);
4780 if (options->detect_rename)
4781 diffcore_rename(options);
4782 if (options->break_opt != -1)
4783 diffcore_merge_broken();
4784 }
4785 if (options->pickaxe)
4786 diffcore_pickaxe(options);
4787 if (options->orderfile)
4788 diffcore_order(options->orderfile);
4789 if (!options->found_follow)
4790 /* See try_to_follow_renames() in tree-diff.c */
4791 diff_resolve_rename_copy();
4792 diffcore_apply_filter(options);
4793
4794 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4795 DIFF_OPT_SET(options, HAS_CHANGES);
4796 else
4797 DIFF_OPT_CLR(options, HAS_CHANGES);
4798
4799 options->found_follow = 0;
4800 }
4801
4802 int diff_result_code(struct diff_options *opt, int status)
4803 {
4804 int result = 0;
4805
4806 diff_warn_rename_limit("diff.renameLimit",
4807 opt->needed_rename_limit,
4808 opt->degraded_cc_to_c);
4809 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4810 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4811 return status;
4812 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4813 DIFF_OPT_TST(opt, HAS_CHANGES))
4814 result |= 01;
4815 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4816 DIFF_OPT_TST(opt, CHECK_FAILED))
4817 result |= 02;
4818 return result;
4819 }
4820
4821 int diff_can_quit_early(struct diff_options *opt)
4822 {
4823 return (DIFF_OPT_TST(opt, QUICK) &&
4824 !opt->filter &&
4825 DIFF_OPT_TST(opt, HAS_CHANGES));
4826 }
4827
4828 /*
4829 * Shall changes to this submodule be ignored?
4830 *
4831 * Submodule changes can be configured to be ignored separately for each path,
4832 * but that configuration can be overridden from the command line.
4833 */
4834 static int is_submodule_ignored(const char *path, struct diff_options *options)
4835 {
4836 int ignored = 0;
4837 unsigned orig_flags = options->flags;
4838 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4839 set_diffopt_flags_from_submodule_config(options, path);
4840 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4841 ignored = 1;
4842 options->flags = orig_flags;
4843 return ignored;
4844 }
4845
4846 void diff_addremove(struct diff_options *options,
4847 int addremove, unsigned mode,
4848 const unsigned char *sha1,
4849 int sha1_valid,
4850 const char *concatpath, unsigned dirty_submodule)
4851 {
4852 struct diff_filespec *one, *two;
4853
4854 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4855 return;
4856
4857 /* This may look odd, but it is a preparation for
4858 * feeding "there are unchanged files which should
4859 * not produce diffs, but when you are doing copy
4860 * detection you would need them, so here they are"
4861 * entries to the diff-core. They will be prefixed
4862 * with something like '=' or '*' (I haven't decided
4863 * which but should not make any difference).
4864 * Feeding the same new and old to diff_change()
4865 * also has the same effect.
4866 * Before the final output happens, they are pruned after
4867 * merged into rename/copy pairs as appropriate.
4868 */
4869 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4870 addremove = (addremove == '+' ? '-' :
4871 addremove == '-' ? '+' : addremove);
4872
4873 if (options->prefix &&
4874 strncmp(concatpath, options->prefix, options->prefix_length))
4875 return;
4876
4877 one = alloc_filespec(concatpath);
4878 two = alloc_filespec(concatpath);
4879
4880 if (addremove != '+')
4881 fill_filespec(one, sha1, sha1_valid, mode);
4882 if (addremove != '-') {
4883 fill_filespec(two, sha1, sha1_valid, mode);
4884 two->dirty_submodule = dirty_submodule;
4885 }
4886
4887 diff_queue(&diff_queued_diff, one, two);
4888 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4889 DIFF_OPT_SET(options, HAS_CHANGES);
4890 }
4891
4892 void diff_change(struct diff_options *options,
4893 unsigned old_mode, unsigned new_mode,
4894 const unsigned char *old_sha1,
4895 const unsigned char *new_sha1,
4896 int old_sha1_valid, int new_sha1_valid,
4897 const char *concatpath,
4898 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4899 {
4900 struct diff_filespec *one, *two;
4901 struct diff_filepair *p;
4902
4903 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4904 is_submodule_ignored(concatpath, options))
4905 return;
4906
4907 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4908 unsigned tmp;
4909 const unsigned char *tmp_c;
4910 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4911 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4912 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4913 new_sha1_valid = tmp;
4914 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4915 new_dirty_submodule = tmp;
4916 }
4917
4918 if (options->prefix &&
4919 strncmp(concatpath, options->prefix, options->prefix_length))
4920 return;
4921
4922 one = alloc_filespec(concatpath);
4923 two = alloc_filespec(concatpath);
4924 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4925 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4926 one->dirty_submodule = old_dirty_submodule;
4927 two->dirty_submodule = new_dirty_submodule;
4928 p = diff_queue(&diff_queued_diff, one, two);
4929
4930 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4931 return;
4932
4933 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
4934 !diff_filespec_check_stat_unmatch(p))
4935 return;
4936
4937 DIFF_OPT_SET(options, HAS_CHANGES);
4938 }
4939
4940 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4941 {
4942 struct diff_filepair *pair;
4943 struct diff_filespec *one, *two;
4944
4945 if (options->prefix &&
4946 strncmp(path, options->prefix, options->prefix_length))
4947 return NULL;
4948
4949 one = alloc_filespec(path);
4950 two = alloc_filespec(path);
4951 pair = diff_queue(&diff_queued_diff, one, two);
4952 pair->is_unmerged = 1;
4953 return pair;
4954 }
4955
4956 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4957 size_t *outsize)
4958 {
4959 struct diff_tempfile *temp;
4960 const char *argv[3];
4961 const char **arg = argv;
4962 struct child_process child = CHILD_PROCESS_INIT;
4963 struct strbuf buf = STRBUF_INIT;
4964 int err = 0;
4965
4966 temp = prepare_temp_file(spec->path, spec);
4967 *arg++ = pgm;
4968 *arg++ = temp->name;
4969 *arg = NULL;
4970
4971 child.use_shell = 1;
4972 child.argv = argv;
4973 child.out = -1;
4974 if (start_command(&child)) {
4975 remove_tempfile();
4976 return NULL;
4977 }
4978
4979 if (strbuf_read(&buf, child.out, 0) < 0)
4980 err = error("error reading from textconv command '%s'", pgm);
4981 close(child.out);
4982
4983 if (finish_command(&child) || err) {
4984 strbuf_release(&buf);
4985 remove_tempfile();
4986 return NULL;
4987 }
4988 remove_tempfile();
4989
4990 return strbuf_detach(&buf, outsize);
4991 }
4992
4993 size_t fill_textconv(struct userdiff_driver *driver,
4994 struct diff_filespec *df,
4995 char **outbuf)
4996 {
4997 size_t size;
4998
4999 if (!driver || !driver->textconv) {
5000 if (!DIFF_FILE_VALID(df)) {
5001 *outbuf = "";
5002 return 0;
5003 }
5004 if (diff_populate_filespec(df, 0))
5005 die("unable to read files to diff");
5006 *outbuf = df->data;
5007 return df->size;
5008 }
5009
5010 if (driver->textconv_cache && df->sha1_valid) {
5011 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
5012 &size);
5013 if (*outbuf)
5014 return size;
5015 }
5016
5017 *outbuf = run_textconv(driver->textconv, df, &size);
5018 if (!*outbuf)
5019 die("unable to read files to diff");
5020
5021 if (driver->textconv_cache && df->sha1_valid) {
5022 /* ignore errors, as we might be in a readonly repository */
5023 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
5024 size);
5025 /*
5026 * we could save up changes and flush them all at the end,
5027 * but we would need an extra call after all diffing is done.
5028 * Since generating a cache entry is the slow path anyway,
5029 * this extra overhead probably isn't a big deal.
5030 */
5031 notes_cache_write(driver->textconv_cache);
5032 }
5033
5034 return size;
5035 }
5036
5037 void setup_diff_pager(struct diff_options *opt)
5038 {
5039 /*
5040 * If the user asked for our exit code, then either they want --quiet
5041 * or --exit-code. We should definitely not bother with a pager in the
5042 * former case, as we will generate no output. Since we still properly
5043 * report our exit code even when a pager is run, we _could_ run a
5044 * pager with --exit-code. But since we have not done so historically,
5045 * and because it is easy to find people oneline advising "git diff
5046 * --exit-code" in hooks and other scripts, we do not do so.
5047 */
5048 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5049 check_pager_config("diff") != 0)
5050 setup_pager();
5051 }
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