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Merge branch 'tz/perl-styles'
[git/gitweb.git] / diff.c
blob348f71b46256657860a2f7f79598e1d9b19d6c54
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
20 #ifdef NO_FAST_WORKING_DIRECTORY
21 #define FAST_WORKING_DIRECTORY 0
22 #else
23 #define FAST_WORKING_DIRECTORY 1
24 #endif
25
26 static int diff_detect_rename_default;
27 static int diff_rename_limit_default = 400;
28 static int diff_suppress_blank_empty;
29 static int diff_use_color_default = -1;
30 static int diff_context_default = 3;
31 static const char *diff_word_regex_cfg;
32 static const char *external_diff_cmd_cfg;
33 int diff_auto_refresh_index = 1;
34 static int diff_mnemonic_prefix;
35 static int diff_no_prefix;
36 static int diff_stat_graph_width;
37 static int diff_dirstat_permille_default = 30;
38 static struct diff_options default_diff_options;
39
40 static char diff_colors[][COLOR_MAXLEN] = {
41 GIT_COLOR_RESET,
42 GIT_COLOR_NORMAL, /* PLAIN */
43 GIT_COLOR_BOLD, /* METAINFO */
44 GIT_COLOR_CYAN, /* FRAGINFO */
45 GIT_COLOR_RED, /* OLD */
46 GIT_COLOR_GREEN, /* NEW */
47 GIT_COLOR_YELLOW, /* COMMIT */
48 GIT_COLOR_BG_RED, /* WHITESPACE */
49 GIT_COLOR_NORMAL, /* FUNCINFO */
50 };
51
52 static int parse_diff_color_slot(const char *var, int ofs)
53 {
54 if (!strcasecmp(var+ofs, "plain"))
55 return DIFF_PLAIN;
56 if (!strcasecmp(var+ofs, "meta"))
57 return DIFF_METAINFO;
58 if (!strcasecmp(var+ofs, "frag"))
59 return DIFF_FRAGINFO;
60 if (!strcasecmp(var+ofs, "old"))
61 return DIFF_FILE_OLD;
62 if (!strcasecmp(var+ofs, "new"))
63 return DIFF_FILE_NEW;
64 if (!strcasecmp(var+ofs, "commit"))
65 return DIFF_COMMIT;
66 if (!strcasecmp(var+ofs, "whitespace"))
67 return DIFF_WHITESPACE;
68 if (!strcasecmp(var+ofs, "func"))
69 return DIFF_FUNCINFO;
70 return -1;
71 }
72
73 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
74 struct strbuf *errmsg)
75 {
76 char *params_copy = xstrdup(params_string);
77 struct string_list params = STRING_LIST_INIT_NODUP;
78 int ret = 0;
79 int i;
80
81 if (*params_copy)
82 string_list_split_in_place(&params, params_copy, ',', -1);
83 for (i = 0; i < params.nr; i++) {
84 const char *p = params.items[i].string;
85 if (!strcmp(p, "changes")) {
86 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
87 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
88 } else if (!strcmp(p, "lines")) {
89 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
90 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
91 } else if (!strcmp(p, "files")) {
92 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
93 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
94 } else if (!strcmp(p, "noncumulative")) {
95 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
96 } else if (!strcmp(p, "cumulative")) {
97 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
98 } else if (isdigit(*p)) {
99 char *end;
100 int permille = strtoul(p, &end, 10) * 10;
101 if (*end == '.' && isdigit(*++end)) {
102 /* only use first digit */
103 permille += *end - '0';
104 /* .. and ignore any further digits */
105 while (isdigit(*++end))
106 ; /* nothing */
107 }
108 if (!*end)
109 options->dirstat_permille = permille;
110 else {
111 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
112 p);
113 ret++;
114 }
115 } else {
116 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
117 ret++;
118 }
119
120 }
121 string_list_clear(&params, 0);
122 free(params_copy);
123 return ret;
124 }
125
126 static int parse_submodule_params(struct diff_options *options, const char *value)
127 {
128 if (!strcmp(value, "log"))
129 DIFF_OPT_SET(options, SUBMODULE_LOG);
130 else if (!strcmp(value, "short"))
131 DIFF_OPT_CLR(options, SUBMODULE_LOG);
132 else
133 return -1;
134 return 0;
135 }
136
137 static int git_config_rename(const char *var, const char *value)
138 {
139 if (!value)
140 return DIFF_DETECT_RENAME;
141 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
142 return DIFF_DETECT_COPY;
143 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
144 }
145
146 /*
147 * These are to give UI layer defaults.
148 * The core-level commands such as git-diff-files should
149 * never be affected by the setting of diff.renames
150 * the user happens to have in the configuration file.
151 */
152 int git_diff_ui_config(const char *var, const char *value, void *cb)
153 {
154 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
155 diff_use_color_default = git_config_colorbool(var, value);
156 return 0;
157 }
158 if (!strcmp(var, "diff.context")) {
159 diff_context_default = git_config_int(var, value);
160 if (diff_context_default < 0)
161 return -1;
162 return 0;
163 }
164 if (!strcmp(var, "diff.renames")) {
165 diff_detect_rename_default = git_config_rename(var, value);
166 return 0;
167 }
168 if (!strcmp(var, "diff.autorefreshindex")) {
169 diff_auto_refresh_index = git_config_bool(var, value);
170 return 0;
171 }
172 if (!strcmp(var, "diff.mnemonicprefix")) {
173 diff_mnemonic_prefix = git_config_bool(var, value);
174 return 0;
175 }
176 if (!strcmp(var, "diff.noprefix")) {
177 diff_no_prefix = git_config_bool(var, value);
178 return 0;
179 }
180 if (!strcmp(var, "diff.statgraphwidth")) {
181 diff_stat_graph_width = git_config_int(var, value);
182 return 0;
183 }
184 if (!strcmp(var, "diff.external"))
185 return git_config_string(&external_diff_cmd_cfg, var, value);
186 if (!strcmp(var, "diff.wordregex"))
187 return git_config_string(&diff_word_regex_cfg, var, value);
188
189 if (!strcmp(var, "diff.ignoresubmodules"))
190 handle_ignore_submodules_arg(&default_diff_options, value);
191
192 if (!strcmp(var, "diff.submodule")) {
193 if (parse_submodule_params(&default_diff_options, value))
194 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
195 value);
196 return 0;
197 }
198
199 if (git_color_config(var, value, cb) < 0)
200 return -1;
201
202 return git_diff_basic_config(var, value, cb);
203 }
204
205 int git_diff_basic_config(const char *var, const char *value, void *cb)
206 {
207 if (!strcmp(var, "diff.renamelimit")) {
208 diff_rename_limit_default = git_config_int(var, value);
209 return 0;
210 }
211
212 if (userdiff_config(var, value) < 0)
213 return -1;
214
215 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
216 int slot = parse_diff_color_slot(var, 11);
217 if (slot < 0)
218 return 0;
219 if (!value)
220 return config_error_nonbool(var);
221 color_parse(value, var, diff_colors[slot]);
222 return 0;
223 }
224
225 /* like GNU diff's --suppress-blank-empty option */
226 if (!strcmp(var, "diff.suppressblankempty") ||
227 /* for backwards compatibility */
228 !strcmp(var, "diff.suppress-blank-empty")) {
229 diff_suppress_blank_empty = git_config_bool(var, value);
230 return 0;
231 }
232
233 if (!strcmp(var, "diff.dirstat")) {
234 struct strbuf errmsg = STRBUF_INIT;
235 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
236 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
237 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
238 errmsg.buf);
239 strbuf_release(&errmsg);
240 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
241 return 0;
242 }
243
244 if (!prefixcmp(var, "submodule."))
245 return parse_submodule_config_option(var, value);
246
247 return git_default_config(var, value, cb);
248 }
249
250 static char *quote_two(const char *one, const char *two)
251 {
252 int need_one = quote_c_style(one, NULL, NULL, 1);
253 int need_two = quote_c_style(two, NULL, NULL, 1);
254 struct strbuf res = STRBUF_INIT;
255
256 if (need_one + need_two) {
257 strbuf_addch(&res, '"');
258 quote_c_style(one, &res, NULL, 1);
259 quote_c_style(two, &res, NULL, 1);
260 strbuf_addch(&res, '"');
261 } else {
262 strbuf_addstr(&res, one);
263 strbuf_addstr(&res, two);
264 }
265 return strbuf_detach(&res, NULL);
266 }
267
268 static const char *external_diff(void)
269 {
270 static const char *external_diff_cmd = NULL;
271 static int done_preparing = 0;
272
273 if (done_preparing)
274 return external_diff_cmd;
275 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
276 if (!external_diff_cmd)
277 external_diff_cmd = external_diff_cmd_cfg;
278 done_preparing = 1;
279 return external_diff_cmd;
280 }
281
282 static struct diff_tempfile {
283 const char *name; /* filename external diff should read from */
284 char hex[41];
285 char mode[10];
286 char tmp_path[PATH_MAX];
287 } diff_temp[2];
288
289 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
290
291 struct emit_callback {
292 int color_diff;
293 unsigned ws_rule;
294 int blank_at_eof_in_preimage;
295 int blank_at_eof_in_postimage;
296 int lno_in_preimage;
297 int lno_in_postimage;
298 sane_truncate_fn truncate;
299 const char **label_path;
300 struct diff_words_data *diff_words;
301 struct diff_options *opt;
302 int *found_changesp;
303 struct strbuf *header;
304 };
305
306 static int count_lines(const char *data, int size)
307 {
308 int count, ch, completely_empty = 1, nl_just_seen = 0;
309 count = 0;
310 while (0 < size--) {
311 ch = *data++;
312 if (ch == '\n') {
313 count++;
314 nl_just_seen = 1;
315 completely_empty = 0;
316 }
317 else {
318 nl_just_seen = 0;
319 completely_empty = 0;
320 }
321 }
322 if (completely_empty)
323 return 0;
324 if (!nl_just_seen)
325 count++; /* no trailing newline */
326 return count;
327 }
328
329 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
330 {
331 if (!DIFF_FILE_VALID(one)) {
332 mf->ptr = (char *)""; /* does not matter */
333 mf->size = 0;
334 return 0;
335 }
336 else if (diff_populate_filespec(one, 0))
337 return -1;
338
339 mf->ptr = one->data;
340 mf->size = one->size;
341 return 0;
342 }
343
344 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
345 static unsigned long diff_filespec_size(struct diff_filespec *one)
346 {
347 if (!DIFF_FILE_VALID(one))
348 return 0;
349 diff_populate_filespec(one, 1);
350 return one->size;
351 }
352
353 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
354 {
355 char *ptr = mf->ptr;
356 long size = mf->size;
357 int cnt = 0;
358
359 if (!size)
360 return cnt;
361 ptr += size - 1; /* pointing at the very end */
362 if (*ptr != '\n')
363 ; /* incomplete line */
364 else
365 ptr--; /* skip the last LF */
366 while (mf->ptr < ptr) {
367 char *prev_eol;
368 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
369 if (*prev_eol == '\n')
370 break;
371 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
372 break;
373 cnt++;
374 ptr = prev_eol - 1;
375 }
376 return cnt;
377 }
378
379 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
380 struct emit_callback *ecbdata)
381 {
382 int l1, l2, at;
383 unsigned ws_rule = ecbdata->ws_rule;
384 l1 = count_trailing_blank(mf1, ws_rule);
385 l2 = count_trailing_blank(mf2, ws_rule);
386 if (l2 <= l1) {
387 ecbdata->blank_at_eof_in_preimage = 0;
388 ecbdata->blank_at_eof_in_postimage = 0;
389 return;
390 }
391 at = count_lines(mf1->ptr, mf1->size);
392 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
393
394 at = count_lines(mf2->ptr, mf2->size);
395 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
396 }
397
398 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
399 int first, const char *line, int len)
400 {
401 int has_trailing_newline, has_trailing_carriage_return;
402 int nofirst;
403 FILE *file = o->file;
404
405 if (o->output_prefix) {
406 struct strbuf *msg = NULL;
407 msg = o->output_prefix(o, o->output_prefix_data);
408 assert(msg);
409 fwrite(msg->buf, msg->len, 1, file);
410 }
411
412 if (len == 0) {
413 has_trailing_newline = (first == '\n');
414 has_trailing_carriage_return = (!has_trailing_newline &&
415 (first == '\r'));
416 nofirst = has_trailing_newline || has_trailing_carriage_return;
417 } else {
418 has_trailing_newline = (len > 0 && line[len-1] == '\n');
419 if (has_trailing_newline)
420 len--;
421 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
422 if (has_trailing_carriage_return)
423 len--;
424 nofirst = 0;
425 }
426
427 if (len || !nofirst) {
428 fputs(set, file);
429 if (!nofirst)
430 fputc(first, file);
431 fwrite(line, len, 1, file);
432 fputs(reset, file);
433 }
434 if (has_trailing_carriage_return)
435 fputc('\r', file);
436 if (has_trailing_newline)
437 fputc('\n', file);
438 }
439
440 static void emit_line(struct diff_options *o, const char *set, const char *reset,
441 const char *line, int len)
442 {
443 emit_line_0(o, set, reset, line[0], line+1, len-1);
444 }
445
446 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
447 {
448 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
449 ecbdata->blank_at_eof_in_preimage &&
450 ecbdata->blank_at_eof_in_postimage &&
451 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
452 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
453 return 0;
454 return ws_blank_line(line, len, ecbdata->ws_rule);
455 }
456
457 static void emit_add_line(const char *reset,
458 struct emit_callback *ecbdata,
459 const char *line, int len)
460 {
461 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
462 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
463
464 if (!*ws)
465 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
466 else if (new_blank_line_at_eof(ecbdata, line, len))
467 /* Blank line at EOF - paint '+' as well */
468 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
469 else {
470 /* Emit just the prefix, then the rest. */
471 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
472 ws_check_emit(line, len, ecbdata->ws_rule,
473 ecbdata->opt->file, set, reset, ws);
474 }
475 }
476
477 static void emit_hunk_header(struct emit_callback *ecbdata,
478 const char *line, int len)
479 {
480 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
481 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
482 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
483 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
484 static const char atat[2] = { '@', '@' };
485 const char *cp, *ep;
486 struct strbuf msgbuf = STRBUF_INIT;
487 int org_len = len;
488 int i = 1;
489
490 /*
491 * As a hunk header must begin with "@@ -<old>, +<new> @@",
492 * it always is at least 10 bytes long.
493 */
494 if (len < 10 ||
495 memcmp(line, atat, 2) ||
496 !(ep = memmem(line + 2, len - 2, atat, 2))) {
497 emit_line(ecbdata->opt, plain, reset, line, len);
498 return;
499 }
500 ep += 2; /* skip over @@ */
501
502 /* The hunk header in fraginfo color */
503 strbuf_add(&msgbuf, frag, strlen(frag));
504 strbuf_add(&msgbuf, line, ep - line);
505 strbuf_add(&msgbuf, reset, strlen(reset));
506
507 /*
508 * trailing "\r\n"
509 */
510 for ( ; i < 3; i++)
511 if (line[len - i] == '\r' || line[len - i] == '\n')
512 len--;
513
514 /* blank before the func header */
515 for (cp = ep; ep - line < len; ep++)
516 if (*ep != ' ' && *ep != '\t')
517 break;
518 if (ep != cp) {
519 strbuf_add(&msgbuf, plain, strlen(plain));
520 strbuf_add(&msgbuf, cp, ep - cp);
521 strbuf_add(&msgbuf, reset, strlen(reset));
522 }
523
524 if (ep < line + len) {
525 strbuf_add(&msgbuf, func, strlen(func));
526 strbuf_add(&msgbuf, ep, line + len - ep);
527 strbuf_add(&msgbuf, reset, strlen(reset));
528 }
529
530 strbuf_add(&msgbuf, line + len, org_len - len);
531 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
532 strbuf_release(&msgbuf);
533 }
534
535 static struct diff_tempfile *claim_diff_tempfile(void) {
536 int i;
537 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
538 if (!diff_temp[i].name)
539 return diff_temp + i;
540 die("BUG: diff is failing to clean up its tempfiles");
541 }
542
543 static int remove_tempfile_installed;
544
545 static void remove_tempfile(void)
546 {
547 int i;
548 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
549 if (diff_temp[i].name == diff_temp[i].tmp_path)
550 unlink_or_warn(diff_temp[i].name);
551 diff_temp[i].name = NULL;
552 }
553 }
554
555 static void remove_tempfile_on_signal(int signo)
556 {
557 remove_tempfile();
558 sigchain_pop(signo);
559 raise(signo);
560 }
561
562 static void print_line_count(FILE *file, int count)
563 {
564 switch (count) {
565 case 0:
566 fprintf(file, "0,0");
567 break;
568 case 1:
569 fprintf(file, "1");
570 break;
571 default:
572 fprintf(file, "1,%d", count);
573 break;
574 }
575 }
576
577 static void emit_rewrite_lines(struct emit_callback *ecb,
578 int prefix, const char *data, int size)
579 {
580 const char *endp = NULL;
581 static const char *nneof = " No newline at end of file\n";
582 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
583 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
584
585 while (0 < size) {
586 int len;
587
588 endp = memchr(data, '\n', size);
589 len = endp ? (endp - data + 1) : size;
590 if (prefix != '+') {
591 ecb->lno_in_preimage++;
592 emit_line_0(ecb->opt, old, reset, '-',
593 data, len);
594 } else {
595 ecb->lno_in_postimage++;
596 emit_add_line(reset, ecb, data, len);
597 }
598 size -= len;
599 data += len;
600 }
601 if (!endp) {
602 const char *plain = diff_get_color(ecb->color_diff,
603 DIFF_PLAIN);
604 putc('\n', ecb->opt->file);
605 emit_line_0(ecb->opt, plain, reset, '\\',
606 nneof, strlen(nneof));
607 }
608 }
609
610 static void emit_rewrite_diff(const char *name_a,
611 const char *name_b,
612 struct diff_filespec *one,
613 struct diff_filespec *two,
614 struct userdiff_driver *textconv_one,
615 struct userdiff_driver *textconv_two,
616 struct diff_options *o)
617 {
618 int lc_a, lc_b;
619 const char *name_a_tab, *name_b_tab;
620 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
621 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
622 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
623 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
624 const char *a_prefix, *b_prefix;
625 char *data_one, *data_two;
626 size_t size_one, size_two;
627 struct emit_callback ecbdata;
628 char *line_prefix = "";
629 struct strbuf *msgbuf;
630
631 if (o && o->output_prefix) {
632 msgbuf = o->output_prefix(o, o->output_prefix_data);
633 line_prefix = msgbuf->buf;
634 }
635
636 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
637 a_prefix = o->b_prefix;
638 b_prefix = o->a_prefix;
639 } else {
640 a_prefix = o->a_prefix;
641 b_prefix = o->b_prefix;
642 }
643
644 name_a += (*name_a == '/');
645 name_b += (*name_b == '/');
646 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
647 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
648
649 strbuf_reset(&a_name);
650 strbuf_reset(&b_name);
651 quote_two_c_style(&a_name, a_prefix, name_a, 0);
652 quote_two_c_style(&b_name, b_prefix, name_b, 0);
653
654 size_one = fill_textconv(textconv_one, one, &data_one);
655 size_two = fill_textconv(textconv_two, two, &data_two);
656
657 memset(&ecbdata, 0, sizeof(ecbdata));
658 ecbdata.color_diff = want_color(o->use_color);
659 ecbdata.found_changesp = &o->found_changes;
660 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
661 ecbdata.opt = o;
662 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
663 mmfile_t mf1, mf2;
664 mf1.ptr = (char *)data_one;
665 mf2.ptr = (char *)data_two;
666 mf1.size = size_one;
667 mf2.size = size_two;
668 check_blank_at_eof(&mf1, &mf2, &ecbdata);
669 }
670 ecbdata.lno_in_preimage = 1;
671 ecbdata.lno_in_postimage = 1;
672
673 lc_a = count_lines(data_one, size_one);
674 lc_b = count_lines(data_two, size_two);
675 fprintf(o->file,
676 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
677 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
678 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
679 line_prefix, fraginfo);
680 if (!o->irreversible_delete)
681 print_line_count(o->file, lc_a);
682 else
683 fprintf(o->file, "?,?");
684 fprintf(o->file, " +");
685 print_line_count(o->file, lc_b);
686 fprintf(o->file, " @@%s\n", reset);
687 if (lc_a && !o->irreversible_delete)
688 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
689 if (lc_b)
690 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
691 if (textconv_one)
692 free((char *)data_one);
693 if (textconv_two)
694 free((char *)data_two);
695 }
696
697 struct diff_words_buffer {
698 mmfile_t text;
699 long alloc;
700 struct diff_words_orig {
701 const char *begin, *end;
702 } *orig;
703 int orig_nr, orig_alloc;
704 };
705
706 static void diff_words_append(char *line, unsigned long len,
707 struct diff_words_buffer *buffer)
708 {
709 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
710 line++;
711 len--;
712 memcpy(buffer->text.ptr + buffer->text.size, line, len);
713 buffer->text.size += len;
714 buffer->text.ptr[buffer->text.size] = '\0';
715 }
716
717 struct diff_words_style_elem {
718 const char *prefix;
719 const char *suffix;
720 const char *color; /* NULL; filled in by the setup code if
721 * color is enabled */
722 };
723
724 struct diff_words_style {
725 enum diff_words_type type;
726 struct diff_words_style_elem new, old, ctx;
727 const char *newline;
728 };
729
730 static struct diff_words_style diff_words_styles[] = {
731 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
732 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
733 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
734 };
735
736 struct diff_words_data {
737 struct diff_words_buffer minus, plus;
738 const char *current_plus;
739 int last_minus;
740 struct diff_options *opt;
741 regex_t *word_regex;
742 enum diff_words_type type;
743 struct diff_words_style *style;
744 };
745
746 static int fn_out_diff_words_write_helper(FILE *fp,
747 struct diff_words_style_elem *st_el,
748 const char *newline,
749 size_t count, const char *buf,
750 const char *line_prefix)
751 {
752 int print = 0;
753
754 while (count) {
755 char *p = memchr(buf, '\n', count);
756 if (print)
757 fputs(line_prefix, fp);
758 if (p != buf) {
759 if (st_el->color && fputs(st_el->color, fp) < 0)
760 return -1;
761 if (fputs(st_el->prefix, fp) < 0 ||
762 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
763 fputs(st_el->suffix, fp) < 0)
764 return -1;
765 if (st_el->color && *st_el->color
766 && fputs(GIT_COLOR_RESET, fp) < 0)
767 return -1;
768 }
769 if (!p)
770 return 0;
771 if (fputs(newline, fp) < 0)
772 return -1;
773 count -= p + 1 - buf;
774 buf = p + 1;
775 print = 1;
776 }
777 return 0;
778 }
779
780 /*
781 * '--color-words' algorithm can be described as:
782 *
783 * 1. collect a the minus/plus lines of a diff hunk, divided into
784 * minus-lines and plus-lines;
785 *
786 * 2. break both minus-lines and plus-lines into words and
787 * place them into two mmfile_t with one word for each line;
788 *
789 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
790 *
791 * And for the common parts of the both file, we output the plus side text.
792 * diff_words->current_plus is used to trace the current position of the plus file
793 * which printed. diff_words->last_minus is used to trace the last minus word
794 * printed.
795 *
796 * For '--graph' to work with '--color-words', we need to output the graph prefix
797 * on each line of color words output. Generally, there are two conditions on
798 * which we should output the prefix.
799 *
800 * 1. diff_words->last_minus == 0 &&
801 * diff_words->current_plus == diff_words->plus.text.ptr
802 *
803 * that is: the plus text must start as a new line, and if there is no minus
804 * word printed, a graph prefix must be printed.
805 *
806 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
807 * *(diff_words->current_plus - 1) == '\n'
808 *
809 * that is: a graph prefix must be printed following a '\n'
810 */
811 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
812 {
813 if ((diff_words->last_minus == 0 &&
814 diff_words->current_plus == diff_words->plus.text.ptr) ||
815 (diff_words->current_plus > diff_words->plus.text.ptr &&
816 *(diff_words->current_plus - 1) == '\n')) {
817 return 1;
818 } else {
819 return 0;
820 }
821 }
822
823 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
824 {
825 struct diff_words_data *diff_words = priv;
826 struct diff_words_style *style = diff_words->style;
827 int minus_first, minus_len, plus_first, plus_len;
828 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
829 struct diff_options *opt = diff_words->opt;
830 struct strbuf *msgbuf;
831 char *line_prefix = "";
832
833 if (line[0] != '@' || parse_hunk_header(line, len,
834 &minus_first, &minus_len, &plus_first, &plus_len))
835 return;
836
837 assert(opt);
838 if (opt->output_prefix) {
839 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
840 line_prefix = msgbuf->buf;
841 }
842
843 /* POSIX requires that first be decremented by one if len == 0... */
844 if (minus_len) {
845 minus_begin = diff_words->minus.orig[minus_first].begin;
846 minus_end =
847 diff_words->minus.orig[minus_first + minus_len - 1].end;
848 } else
849 minus_begin = minus_end =
850 diff_words->minus.orig[minus_first].end;
851
852 if (plus_len) {
853 plus_begin = diff_words->plus.orig[plus_first].begin;
854 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
855 } else
856 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
857
858 if (color_words_output_graph_prefix(diff_words)) {
859 fputs(line_prefix, diff_words->opt->file);
860 }
861 if (diff_words->current_plus != plus_begin) {
862 fn_out_diff_words_write_helper(diff_words->opt->file,
863 &style->ctx, style->newline,
864 plus_begin - diff_words->current_plus,
865 diff_words->current_plus, line_prefix);
866 if (*(plus_begin - 1) == '\n')
867 fputs(line_prefix, diff_words->opt->file);
868 }
869 if (minus_begin != minus_end) {
870 fn_out_diff_words_write_helper(diff_words->opt->file,
871 &style->old, style->newline,
872 minus_end - minus_begin, minus_begin,
873 line_prefix);
874 }
875 if (plus_begin != plus_end) {
876 fn_out_diff_words_write_helper(diff_words->opt->file,
877 &style->new, style->newline,
878 plus_end - plus_begin, plus_begin,
879 line_prefix);
880 }
881
882 diff_words->current_plus = plus_end;
883 diff_words->last_minus = minus_first;
884 }
885
886 /* This function starts looking at *begin, and returns 0 iff a word was found. */
887 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
888 int *begin, int *end)
889 {
890 if (word_regex && *begin < buffer->size) {
891 regmatch_t match[1];
892 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
893 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
894 '\n', match[0].rm_eo - match[0].rm_so);
895 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
896 *begin += match[0].rm_so;
897 return *begin >= *end;
898 }
899 return -1;
900 }
901
902 /* find the next word */
903 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
904 (*begin)++;
905 if (*begin >= buffer->size)
906 return -1;
907
908 /* find the end of the word */
909 *end = *begin + 1;
910 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
911 (*end)++;
912
913 return 0;
914 }
915
916 /*
917 * This function splits the words in buffer->text, stores the list with
918 * newline separator into out, and saves the offsets of the original words
919 * in buffer->orig.
920 */
921 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
922 regex_t *word_regex)
923 {
924 int i, j;
925 long alloc = 0;
926
927 out->size = 0;
928 out->ptr = NULL;
929
930 /* fake an empty "0th" word */
931 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
932 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
933 buffer->orig_nr = 1;
934
935 for (i = 0; i < buffer->text.size; i++) {
936 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
937 return;
938
939 /* store original boundaries */
940 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
941 buffer->orig_alloc);
942 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
943 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
944 buffer->orig_nr++;
945
946 /* store one word */
947 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
948 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
949 out->ptr[out->size + j - i] = '\n';
950 out->size += j - i + 1;
951
952 i = j - 1;
953 }
954 }
955
956 /* this executes the word diff on the accumulated buffers */
957 static void diff_words_show(struct diff_words_data *diff_words)
958 {
959 xpparam_t xpp;
960 xdemitconf_t xecfg;
961 mmfile_t minus, plus;
962 struct diff_words_style *style = diff_words->style;
963
964 struct diff_options *opt = diff_words->opt;
965 struct strbuf *msgbuf;
966 char *line_prefix = "";
967
968 assert(opt);
969 if (opt->output_prefix) {
970 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
971 line_prefix = msgbuf->buf;
972 }
973
974 /* special case: only removal */
975 if (!diff_words->plus.text.size) {
976 fputs(line_prefix, diff_words->opt->file);
977 fn_out_diff_words_write_helper(diff_words->opt->file,
978 &style->old, style->newline,
979 diff_words->minus.text.size,
980 diff_words->minus.text.ptr, line_prefix);
981 diff_words->minus.text.size = 0;
982 return;
983 }
984
985 diff_words->current_plus = diff_words->plus.text.ptr;
986 diff_words->last_minus = 0;
987
988 memset(&xpp, 0, sizeof(xpp));
989 memset(&xecfg, 0, sizeof(xecfg));
990 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
991 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
992 xpp.flags = 0;
993 /* as only the hunk header will be parsed, we need a 0-context */
994 xecfg.ctxlen = 0;
995 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
996 &xpp, &xecfg);
997 free(minus.ptr);
998 free(plus.ptr);
999 if (diff_words->current_plus != diff_words->plus.text.ptr +
1000 diff_words->plus.text.size) {
1001 if (color_words_output_graph_prefix(diff_words))
1002 fputs(line_prefix, diff_words->opt->file);
1003 fn_out_diff_words_write_helper(diff_words->opt->file,
1004 &style->ctx, style->newline,
1005 diff_words->plus.text.ptr + diff_words->plus.text.size
1006 - diff_words->current_plus, diff_words->current_plus,
1007 line_prefix);
1008 }
1009 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1010 }
1011
1012 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1013 static void diff_words_flush(struct emit_callback *ecbdata)
1014 {
1015 if (ecbdata->diff_words->minus.text.size ||
1016 ecbdata->diff_words->plus.text.size)
1017 diff_words_show(ecbdata->diff_words);
1018 }
1019
1020 static void diff_filespec_load_driver(struct diff_filespec *one)
1021 {
1022 /* Use already-loaded driver */
1023 if (one->driver)
1024 return;
1025
1026 if (S_ISREG(one->mode))
1027 one->driver = userdiff_find_by_path(one->path);
1028
1029 /* Fallback to default settings */
1030 if (!one->driver)
1031 one->driver = userdiff_find_by_name("default");
1032 }
1033
1034 static const char *userdiff_word_regex(struct diff_filespec *one)
1035 {
1036 diff_filespec_load_driver(one);
1037 return one->driver->word_regex;
1038 }
1039
1040 static void init_diff_words_data(struct emit_callback *ecbdata,
1041 struct diff_options *orig_opts,
1042 struct diff_filespec *one,
1043 struct diff_filespec *two)
1044 {
1045 int i;
1046 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1047 memcpy(o, orig_opts, sizeof(struct diff_options));
1048
1049 ecbdata->diff_words =
1050 xcalloc(1, sizeof(struct diff_words_data));
1051 ecbdata->diff_words->type = o->word_diff;
1052 ecbdata->diff_words->opt = o;
1053 if (!o->word_regex)
1054 o->word_regex = userdiff_word_regex(one);
1055 if (!o->word_regex)
1056 o->word_regex = userdiff_word_regex(two);
1057 if (!o->word_regex)
1058 o->word_regex = diff_word_regex_cfg;
1059 if (o->word_regex) {
1060 ecbdata->diff_words->word_regex = (regex_t *)
1061 xmalloc(sizeof(regex_t));
1062 if (regcomp(ecbdata->diff_words->word_regex,
1063 o->word_regex,
1064 REG_EXTENDED | REG_NEWLINE))
1065 die ("Invalid regular expression: %s",
1066 o->word_regex);
1067 }
1068 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1069 if (o->word_diff == diff_words_styles[i].type) {
1070 ecbdata->diff_words->style =
1071 &diff_words_styles[i];
1072 break;
1073 }
1074 }
1075 if (want_color(o->use_color)) {
1076 struct diff_words_style *st = ecbdata->diff_words->style;
1077 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1078 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1079 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1080 }
1081 }
1082
1083 static void free_diff_words_data(struct emit_callback *ecbdata)
1084 {
1085 if (ecbdata->diff_words) {
1086 diff_words_flush(ecbdata);
1087 free (ecbdata->diff_words->opt);
1088 free (ecbdata->diff_words->minus.text.ptr);
1089 free (ecbdata->diff_words->minus.orig);
1090 free (ecbdata->diff_words->plus.text.ptr);
1091 free (ecbdata->diff_words->plus.orig);
1092 if (ecbdata->diff_words->word_regex) {
1093 regfree(ecbdata->diff_words->word_regex);
1094 free(ecbdata->diff_words->word_regex);
1095 }
1096 free(ecbdata->diff_words);
1097 ecbdata->diff_words = NULL;
1098 }
1099 }
1100
1101 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1102 {
1103 if (want_color(diff_use_color))
1104 return diff_colors[ix];
1105 return "";
1106 }
1107
1108 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1109 {
1110 const char *cp;
1111 unsigned long allot;
1112 size_t l = len;
1113
1114 if (ecb->truncate)
1115 return ecb->truncate(line, len);
1116 cp = line;
1117 allot = l;
1118 while (0 < l) {
1119 (void) utf8_width(&cp, &l);
1120 if (!cp)
1121 break; /* truncated in the middle? */
1122 }
1123 return allot - l;
1124 }
1125
1126 static void find_lno(const char *line, struct emit_callback *ecbdata)
1127 {
1128 const char *p;
1129 ecbdata->lno_in_preimage = 0;
1130 ecbdata->lno_in_postimage = 0;
1131 p = strchr(line, '-');
1132 if (!p)
1133 return; /* cannot happen */
1134 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1135 p = strchr(p, '+');
1136 if (!p)
1137 return; /* cannot happen */
1138 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1139 }
1140
1141 static void fn_out_consume(void *priv, char *line, unsigned long len)
1142 {
1143 struct emit_callback *ecbdata = priv;
1144 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1145 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1146 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1147 struct diff_options *o = ecbdata->opt;
1148 char *line_prefix = "";
1149 struct strbuf *msgbuf;
1150
1151 if (o && o->output_prefix) {
1152 msgbuf = o->output_prefix(o, o->output_prefix_data);
1153 line_prefix = msgbuf->buf;
1154 }
1155
1156 if (ecbdata->header) {
1157 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1158 strbuf_reset(ecbdata->header);
1159 ecbdata->header = NULL;
1160 }
1161 *(ecbdata->found_changesp) = 1;
1162
1163 if (ecbdata->label_path[0]) {
1164 const char *name_a_tab, *name_b_tab;
1165
1166 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1167 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1168
1169 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1170 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1171 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1172 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1173 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1174 }
1175
1176 if (diff_suppress_blank_empty
1177 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1178 line[0] = '\n';
1179 len = 1;
1180 }
1181
1182 if (line[0] == '@') {
1183 if (ecbdata->diff_words)
1184 diff_words_flush(ecbdata);
1185 len = sane_truncate_line(ecbdata, line, len);
1186 find_lno(line, ecbdata);
1187 emit_hunk_header(ecbdata, line, len);
1188 if (line[len-1] != '\n')
1189 putc('\n', ecbdata->opt->file);
1190 return;
1191 }
1192
1193 if (len < 1) {
1194 emit_line(ecbdata->opt, reset, reset, line, len);
1195 if (ecbdata->diff_words
1196 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1197 fputs("~\n", ecbdata->opt->file);
1198 return;
1199 }
1200
1201 if (ecbdata->diff_words) {
1202 if (line[0] == '-') {
1203 diff_words_append(line, len,
1204 &ecbdata->diff_words->minus);
1205 return;
1206 } else if (line[0] == '+') {
1207 diff_words_append(line, len,
1208 &ecbdata->diff_words->plus);
1209 return;
1210 } else if (!prefixcmp(line, "\\ ")) {
1211 /*
1212 * Eat the "no newline at eof" marker as if we
1213 * saw a "+" or "-" line with nothing on it,
1214 * and return without diff_words_flush() to
1215 * defer processing. If this is the end of
1216 * preimage, more "+" lines may come after it.
1217 */
1218 return;
1219 }
1220 diff_words_flush(ecbdata);
1221 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1222 emit_line(ecbdata->opt, plain, reset, line, len);
1223 fputs("~\n", ecbdata->opt->file);
1224 } else {
1225 /*
1226 * Skip the prefix character, if any. With
1227 * diff_suppress_blank_empty, there may be
1228 * none.
1229 */
1230 if (line[0] != '\n') {
1231 line++;
1232 len--;
1233 }
1234 emit_line(ecbdata->opt, plain, reset, line, len);
1235 }
1236 return;
1237 }
1238
1239 if (line[0] != '+') {
1240 const char *color =
1241 diff_get_color(ecbdata->color_diff,
1242 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1243 ecbdata->lno_in_preimage++;
1244 if (line[0] == ' ')
1245 ecbdata->lno_in_postimage++;
1246 emit_line(ecbdata->opt, color, reset, line, len);
1247 } else {
1248 ecbdata->lno_in_postimage++;
1249 emit_add_line(reset, ecbdata, line + 1, len - 1);
1250 }
1251 }
1252
1253 static char *pprint_rename(const char *a, const char *b)
1254 {
1255 const char *old = a;
1256 const char *new = b;
1257 struct strbuf name = STRBUF_INIT;
1258 int pfx_length, sfx_length;
1259 int len_a = strlen(a);
1260 int len_b = strlen(b);
1261 int a_midlen, b_midlen;
1262 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1263 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1264
1265 if (qlen_a || qlen_b) {
1266 quote_c_style(a, &name, NULL, 0);
1267 strbuf_addstr(&name, " => ");
1268 quote_c_style(b, &name, NULL, 0);
1269 return strbuf_detach(&name, NULL);
1270 }
1271
1272 /* Find common prefix */
1273 pfx_length = 0;
1274 while (*old && *new && *old == *new) {
1275 if (*old == '/')
1276 pfx_length = old - a + 1;
1277 old++;
1278 new++;
1279 }
1280
1281 /* Find common suffix */
1282 old = a + len_a;
1283 new = b + len_b;
1284 sfx_length = 0;
1285 while (a <= old && b <= new && *old == *new) {
1286 if (*old == '/')
1287 sfx_length = len_a - (old - a);
1288 old--;
1289 new--;
1290 }
1291
1292 /*
1293 * pfx{mid-a => mid-b}sfx
1294 * {pfx-a => pfx-b}sfx
1295 * pfx{sfx-a => sfx-b}
1296 * name-a => name-b
1297 */
1298 a_midlen = len_a - pfx_length - sfx_length;
1299 b_midlen = len_b - pfx_length - sfx_length;
1300 if (a_midlen < 0)
1301 a_midlen = 0;
1302 if (b_midlen < 0)
1303 b_midlen = 0;
1304
1305 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1306 if (pfx_length + sfx_length) {
1307 strbuf_add(&name, a, pfx_length);
1308 strbuf_addch(&name, '{');
1309 }
1310 strbuf_add(&name, a + pfx_length, a_midlen);
1311 strbuf_addstr(&name, " => ");
1312 strbuf_add(&name, b + pfx_length, b_midlen);
1313 if (pfx_length + sfx_length) {
1314 strbuf_addch(&name, '}');
1315 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1316 }
1317 return strbuf_detach(&name, NULL);
1318 }
1319
1320 struct diffstat_t {
1321 int nr;
1322 int alloc;
1323 struct diffstat_file {
1324 char *from_name;
1325 char *name;
1326 char *print_name;
1327 unsigned is_unmerged:1;
1328 unsigned is_binary:1;
1329 unsigned is_renamed:1;
1330 unsigned is_interesting:1;
1331 uintmax_t added, deleted;
1332 } **files;
1333 };
1334
1335 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1336 const char *name_a,
1337 const char *name_b)
1338 {
1339 struct diffstat_file *x;
1340 x = xcalloc(sizeof (*x), 1);
1341 if (diffstat->nr == diffstat->alloc) {
1342 diffstat->alloc = alloc_nr(diffstat->alloc);
1343 diffstat->files = xrealloc(diffstat->files,
1344 diffstat->alloc * sizeof(x));
1345 }
1346 diffstat->files[diffstat->nr++] = x;
1347 if (name_b) {
1348 x->from_name = xstrdup(name_a);
1349 x->name = xstrdup(name_b);
1350 x->is_renamed = 1;
1351 }
1352 else {
1353 x->from_name = NULL;
1354 x->name = xstrdup(name_a);
1355 }
1356 return x;
1357 }
1358
1359 static void diffstat_consume(void *priv, char *line, unsigned long len)
1360 {
1361 struct diffstat_t *diffstat = priv;
1362 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1363
1364 if (line[0] == '+')
1365 x->added++;
1366 else if (line[0] == '-')
1367 x->deleted++;
1368 }
1369
1370 const char mime_boundary_leader[] = "------------";
1371
1372 static int scale_linear(int it, int width, int max_change)
1373 {
1374 if (!it)
1375 return 0;
1376 /*
1377 * make sure that at least one '-' or '+' is printed if
1378 * there is any change to this path. The easiest way is to
1379 * scale linearly as if the alloted width is one column shorter
1380 * than it is, and then add 1 to the result.
1381 */
1382 return 1 + (it * (width - 1) / max_change);
1383 }
1384
1385 static void show_name(FILE *file,
1386 const char *prefix, const char *name, int len)
1387 {
1388 fprintf(file, " %s%-*s |", prefix, len, name);
1389 }
1390
1391 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1392 {
1393 if (cnt <= 0)
1394 return;
1395 fprintf(file, "%s", set);
1396 while (cnt--)
1397 putc(ch, file);
1398 fprintf(file, "%s", reset);
1399 }
1400
1401 static void fill_print_name(struct diffstat_file *file)
1402 {
1403 char *pname;
1404
1405 if (file->print_name)
1406 return;
1407
1408 if (!file->is_renamed) {
1409 struct strbuf buf = STRBUF_INIT;
1410 if (quote_c_style(file->name, &buf, NULL, 0)) {
1411 pname = strbuf_detach(&buf, NULL);
1412 } else {
1413 pname = file->name;
1414 strbuf_release(&buf);
1415 }
1416 } else {
1417 pname = pprint_rename(file->from_name, file->name);
1418 }
1419 file->print_name = pname;
1420 }
1421
1422 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1423 {
1424 struct strbuf sb = STRBUF_INIT;
1425 int ret;
1426
1427 if (!files) {
1428 assert(insertions == 0 && deletions == 0);
1429 return fprintf(fp, "%s\n", " 0 files changed");
1430 }
1431
1432 strbuf_addf(&sb,
1433 (files == 1) ? " %d file changed" : " %d files changed",
1434 files);
1435
1436 /*
1437 * For binary diff, the caller may want to print "x files
1438 * changed" with insertions == 0 && deletions == 0.
1439 *
1440 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1441 * is probably less confusing (i.e skip over "2 files changed
1442 * but nothing about added/removed lines? Is this a bug in Git?").
1443 */
1444 if (insertions || deletions == 0) {
1445 /*
1446 * TRANSLATORS: "+" in (+) is a line addition marker;
1447 * do not translate it.
1448 */
1449 strbuf_addf(&sb,
1450 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1451 insertions);
1452 }
1453
1454 if (deletions || insertions == 0) {
1455 /*
1456 * TRANSLATORS: "-" in (-) is a line removal marker;
1457 * do not translate it.
1458 */
1459 strbuf_addf(&sb,
1460 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1461 deletions);
1462 }
1463 strbuf_addch(&sb, '\n');
1464 ret = fputs(sb.buf, fp);
1465 strbuf_release(&sb);
1466 return ret;
1467 }
1468
1469 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1470 {
1471 int i, len, add, del, adds = 0, dels = 0;
1472 uintmax_t max_change = 0, max_len = 0;
1473 int total_files = data->nr, count;
1474 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1475 const char *reset, *add_c, *del_c;
1476 const char *line_prefix = "";
1477 int extra_shown = 0;
1478 struct strbuf *msg = NULL;
1479
1480 if (data->nr == 0)
1481 return;
1482
1483 if (options->output_prefix) {
1484 msg = options->output_prefix(options, options->output_prefix_data);
1485 line_prefix = msg->buf;
1486 }
1487
1488 count = options->stat_count ? options->stat_count : data->nr;
1489
1490 reset = diff_get_color_opt(options, DIFF_RESET);
1491 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1492 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1493
1494 /*
1495 * Find the longest filename and max number of changes
1496 */
1497 for (i = 0; (i < count) && (i < data->nr); i++) {
1498 struct diffstat_file *file = data->files[i];
1499 uintmax_t change = file->added + file->deleted;
1500
1501 if (!file->is_interesting && (change == 0)) {
1502 count++; /* not shown == room for one more */
1503 continue;
1504 }
1505 fill_print_name(file);
1506 len = strlen(file->print_name);
1507 if (max_len < len)
1508 max_len = len;
1509
1510 if (file->is_unmerged) {
1511 /* "Unmerged" is 8 characters */
1512 bin_width = bin_width < 8 ? 8 : bin_width;
1513 continue;
1514 }
1515 if (file->is_binary) {
1516 /* "Bin XXX -> YYY bytes" */
1517 int w = 14 + decimal_width(file->added)
1518 + decimal_width(file->deleted);
1519 bin_width = bin_width < w ? w : bin_width;
1520 /* Display change counts aligned with "Bin" */
1521 number_width = 3;
1522 continue;
1523 }
1524
1525 if (max_change < change)
1526 max_change = change;
1527 }
1528 count = i; /* where we can stop scanning in data->files[] */
1529
1530 /*
1531 * We have width = stat_width or term_columns() columns total.
1532 * We want a maximum of min(max_len, stat_name_width) for the name part.
1533 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1534 * We also need 1 for " " and 4 + decimal_width(max_change)
1535 * for " | NNNN " and one the empty column at the end, altogether
1536 * 6 + decimal_width(max_change).
1537 *
1538 * If there's not enough space, we will use the smaller of
1539 * stat_name_width (if set) and 5/8*width for the filename,
1540 * and the rest for constant elements + graph part, but no more
1541 * than stat_graph_width for the graph part.
1542 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1543 * for the standard terminal size).
1544 *
1545 * In other words: stat_width limits the maximum width, and
1546 * stat_name_width fixes the maximum width of the filename,
1547 * and is also used to divide available columns if there
1548 * aren't enough.
1549 *
1550 * Binary files are displayed with "Bin XXX -> YYY bytes"
1551 * instead of the change count and graph. This part is treated
1552 * similarly to the graph part, except that it is not
1553 * "scaled". If total width is too small to accomodate the
1554 * guaranteed minimum width of the filename part and the
1555 * separators and this message, this message will "overflow"
1556 * making the line longer than the maximum width.
1557 */
1558
1559 if (options->stat_width == -1)
1560 width = term_columns() - options->output_prefix_length;
1561 else
1562 width = options->stat_width ? options->stat_width : 80;
1563 number_width = decimal_width(max_change) > number_width ?
1564 decimal_width(max_change) : number_width;
1565
1566 if (options->stat_graph_width == -1)
1567 options->stat_graph_width = diff_stat_graph_width;
1568
1569 /*
1570 * Guarantee 3/8*16==6 for the graph part
1571 * and 5/8*16==10 for the filename part
1572 */
1573 if (width < 16 + 6 + number_width)
1574 width = 16 + 6 + number_width;
1575
1576 /*
1577 * First assign sizes that are wanted, ignoring available width.
1578 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1579 * starting from "XXX" should fit in graph_width.
1580 */
1581 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1582 if (options->stat_graph_width &&
1583 options->stat_graph_width < graph_width)
1584 graph_width = options->stat_graph_width;
1585
1586 name_width = (options->stat_name_width > 0 &&
1587 options->stat_name_width < max_len) ?
1588 options->stat_name_width : max_len;
1589
1590 /*
1591 * Adjust adjustable widths not to exceed maximum width
1592 */
1593 if (name_width + number_width + 6 + graph_width > width) {
1594 if (graph_width > width * 3/8 - number_width - 6) {
1595 graph_width = width * 3/8 - number_width - 6;
1596 if (graph_width < 6)
1597 graph_width = 6;
1598 }
1599
1600 if (options->stat_graph_width &&
1601 graph_width > options->stat_graph_width)
1602 graph_width = options->stat_graph_width;
1603 if (name_width > width - number_width - 6 - graph_width)
1604 name_width = width - number_width - 6 - graph_width;
1605 else
1606 graph_width = width - number_width - 6 - name_width;
1607 }
1608
1609 /*
1610 * From here name_width is the width of the name area,
1611 * and graph_width is the width of the graph area.
1612 * max_change is used to scale graph properly.
1613 */
1614 for (i = 0; i < count; i++) {
1615 const char *prefix = "";
1616 struct diffstat_file *file = data->files[i];
1617 char *name = file->print_name;
1618 uintmax_t added = file->added;
1619 uintmax_t deleted = file->deleted;
1620 int name_len;
1621
1622 if (!file->is_interesting && (added + deleted == 0))
1623 continue;
1624
1625 /*
1626 * "scale" the filename
1627 */
1628 len = name_width;
1629 name_len = strlen(name);
1630 if (name_width < name_len) {
1631 char *slash;
1632 prefix = "...";
1633 len -= 3;
1634 name += name_len - len;
1635 slash = strchr(name, '/');
1636 if (slash)
1637 name = slash;
1638 }
1639
1640 if (file->is_binary) {
1641 fprintf(options->file, "%s", line_prefix);
1642 show_name(options->file, prefix, name, len);
1643 fprintf(options->file, " %*s", number_width, "Bin");
1644 if (!added && !deleted) {
1645 putc('\n', options->file);
1646 continue;
1647 }
1648 fprintf(options->file, " %s%"PRIuMAX"%s",
1649 del_c, deleted, reset);
1650 fprintf(options->file, " -> ");
1651 fprintf(options->file, "%s%"PRIuMAX"%s",
1652 add_c, added, reset);
1653 fprintf(options->file, " bytes");
1654 fprintf(options->file, "\n");
1655 continue;
1656 }
1657 else if (file->is_unmerged) {
1658 fprintf(options->file, "%s", line_prefix);
1659 show_name(options->file, prefix, name, len);
1660 fprintf(options->file, " Unmerged\n");
1661 continue;
1662 }
1663
1664 /*
1665 * scale the add/delete
1666 */
1667 add = added;
1668 del = deleted;
1669
1670 if (graph_width <= max_change) {
1671 int total = add + del;
1672
1673 total = scale_linear(add + del, graph_width, max_change);
1674 if (total < 2 && add && del)
1675 /* width >= 2 due to the sanity check */
1676 total = 2;
1677 if (add < del) {
1678 add = scale_linear(add, graph_width, max_change);
1679 del = total - add;
1680 } else {
1681 del = scale_linear(del, graph_width, max_change);
1682 add = total - del;
1683 }
1684 }
1685 fprintf(options->file, "%s", line_prefix);
1686 show_name(options->file, prefix, name, len);
1687 fprintf(options->file, " %*"PRIuMAX"%s",
1688 number_width, added + deleted,
1689 added + deleted ? " " : "");
1690 show_graph(options->file, '+', add, add_c, reset);
1691 show_graph(options->file, '-', del, del_c, reset);
1692 fprintf(options->file, "\n");
1693 }
1694
1695 for (i = 0; i < data->nr; i++) {
1696 struct diffstat_file *file = data->files[i];
1697 uintmax_t added = file->added;
1698 uintmax_t deleted = file->deleted;
1699
1700 if (file->is_unmerged ||
1701 (!file->is_interesting && (added + deleted == 0))) {
1702 total_files--;
1703 continue;
1704 }
1705
1706 if (!file->is_binary) {
1707 adds += added;
1708 dels += deleted;
1709 }
1710 if (i < count)
1711 continue;
1712 if (!extra_shown)
1713 fprintf(options->file, "%s ...\n", line_prefix);
1714 extra_shown = 1;
1715 }
1716 fprintf(options->file, "%s", line_prefix);
1717 print_stat_summary(options->file, total_files, adds, dels);
1718 }
1719
1720 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1721 {
1722 int i, adds = 0, dels = 0, total_files = data->nr;
1723
1724 if (data->nr == 0)
1725 return;
1726
1727 for (i = 0; i < data->nr; i++) {
1728 int added = data->files[i]->added;
1729 int deleted= data->files[i]->deleted;
1730
1731 if (data->files[i]->is_unmerged ||
1732 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1733 total_files--;
1734 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1735 adds += added;
1736 dels += deleted;
1737 }
1738 }
1739 if (options->output_prefix) {
1740 struct strbuf *msg = NULL;
1741 msg = options->output_prefix(options,
1742 options->output_prefix_data);
1743 fprintf(options->file, "%s", msg->buf);
1744 }
1745 print_stat_summary(options->file, total_files, adds, dels);
1746 }
1747
1748 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1749 {
1750 int i;
1751
1752 if (data->nr == 0)
1753 return;
1754
1755 for (i = 0; i < data->nr; i++) {
1756 struct diffstat_file *file = data->files[i];
1757
1758 if (options->output_prefix) {
1759 struct strbuf *msg = NULL;
1760 msg = options->output_prefix(options,
1761 options->output_prefix_data);
1762 fprintf(options->file, "%s", msg->buf);
1763 }
1764
1765 if (file->is_binary)
1766 fprintf(options->file, "-\t-\t");
1767 else
1768 fprintf(options->file,
1769 "%"PRIuMAX"\t%"PRIuMAX"\t",
1770 file->added, file->deleted);
1771 if (options->line_termination) {
1772 fill_print_name(file);
1773 if (!file->is_renamed)
1774 write_name_quoted(file->name, options->file,
1775 options->line_termination);
1776 else {
1777 fputs(file->print_name, options->file);
1778 putc(options->line_termination, options->file);
1779 }
1780 } else {
1781 if (file->is_renamed) {
1782 putc('\0', options->file);
1783 write_name_quoted(file->from_name, options->file, '\0');
1784 }
1785 write_name_quoted(file->name, options->file, '\0');
1786 }
1787 }
1788 }
1789
1790 struct dirstat_file {
1791 const char *name;
1792 unsigned long changed;
1793 };
1794
1795 struct dirstat_dir {
1796 struct dirstat_file *files;
1797 int alloc, nr, permille, cumulative;
1798 };
1799
1800 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1801 unsigned long changed, const char *base, int baselen)
1802 {
1803 unsigned long this_dir = 0;
1804 unsigned int sources = 0;
1805 const char *line_prefix = "";
1806 struct strbuf *msg = NULL;
1807
1808 if (opt->output_prefix) {
1809 msg = opt->output_prefix(opt, opt->output_prefix_data);
1810 line_prefix = msg->buf;
1811 }
1812
1813 while (dir->nr) {
1814 struct dirstat_file *f = dir->files;
1815 int namelen = strlen(f->name);
1816 unsigned long this;
1817 char *slash;
1818
1819 if (namelen < baselen)
1820 break;
1821 if (memcmp(f->name, base, baselen))
1822 break;
1823 slash = strchr(f->name + baselen, '/');
1824 if (slash) {
1825 int newbaselen = slash + 1 - f->name;
1826 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1827 sources++;
1828 } else {
1829 this = f->changed;
1830 dir->files++;
1831 dir->nr--;
1832 sources += 2;
1833 }
1834 this_dir += this;
1835 }
1836
1837 /*
1838 * We don't report dirstat's for
1839 * - the top level
1840 * - or cases where everything came from a single directory
1841 * under this directory (sources == 1).
1842 */
1843 if (baselen && sources != 1) {
1844 if (this_dir) {
1845 int permille = this_dir * 1000 / changed;
1846 if (permille >= dir->permille) {
1847 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1848 permille / 10, permille % 10, baselen, base);
1849 if (!dir->cumulative)
1850 return 0;
1851 }
1852 }
1853 }
1854 return this_dir;
1855 }
1856
1857 static int dirstat_compare(const void *_a, const void *_b)
1858 {
1859 const struct dirstat_file *a = _a;
1860 const struct dirstat_file *b = _b;
1861 return strcmp(a->name, b->name);
1862 }
1863
1864 static void show_dirstat(struct diff_options *options)
1865 {
1866 int i;
1867 unsigned long changed;
1868 struct dirstat_dir dir;
1869 struct diff_queue_struct *q = &diff_queued_diff;
1870
1871 dir.files = NULL;
1872 dir.alloc = 0;
1873 dir.nr = 0;
1874 dir.permille = options->dirstat_permille;
1875 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1876
1877 changed = 0;
1878 for (i = 0; i < q->nr; i++) {
1879 struct diff_filepair *p = q->queue[i];
1880 const char *name;
1881 unsigned long copied, added, damage;
1882 int content_changed;
1883
1884 name = p->two->path ? p->two->path : p->one->path;
1885
1886 if (p->one->sha1_valid && p->two->sha1_valid)
1887 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1888 else
1889 content_changed = 1;
1890
1891 if (!content_changed) {
1892 /*
1893 * The SHA1 has not changed, so pre-/post-content is
1894 * identical. We can therefore skip looking at the
1895 * file contents altogether.
1896 */
1897 damage = 0;
1898 goto found_damage;
1899 }
1900
1901 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1902 /*
1903 * In --dirstat-by-file mode, we don't really need to
1904 * look at the actual file contents at all.
1905 * The fact that the SHA1 changed is enough for us to
1906 * add this file to the list of results
1907 * (with each file contributing equal damage).
1908 */
1909 damage = 1;
1910 goto found_damage;
1911 }
1912
1913 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1914 diff_populate_filespec(p->one, 0);
1915 diff_populate_filespec(p->two, 0);
1916 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1917 &copied, &added);
1918 diff_free_filespec_data(p->one);
1919 diff_free_filespec_data(p->two);
1920 } else if (DIFF_FILE_VALID(p->one)) {
1921 diff_populate_filespec(p->one, 1);
1922 copied = added = 0;
1923 diff_free_filespec_data(p->one);
1924 } else if (DIFF_FILE_VALID(p->two)) {
1925 diff_populate_filespec(p->two, 1);
1926 copied = 0;
1927 added = p->two->size;
1928 diff_free_filespec_data(p->two);
1929 } else
1930 continue;
1931
1932 /*
1933 * Original minus copied is the removed material,
1934 * added is the new material. They are both damages
1935 * made to the preimage.
1936 * If the resulting damage is zero, we know that
1937 * diffcore_count_changes() considers the two entries to
1938 * be identical, but since content_changed is true, we
1939 * know that there must have been _some_ kind of change,
1940 * so we force all entries to have damage > 0.
1941 */
1942 damage = (p->one->size - copied) + added;
1943 if (!damage)
1944 damage = 1;
1945
1946 found_damage:
1947 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1948 dir.files[dir.nr].name = name;
1949 dir.files[dir.nr].changed = damage;
1950 changed += damage;
1951 dir.nr++;
1952 }
1953
1954 /* This can happen even with many files, if everything was renames */
1955 if (!changed)
1956 return;
1957
1958 /* Show all directories with more than x% of the changes */
1959 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1960 gather_dirstat(options, &dir, changed, "", 0);
1961 }
1962
1963 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1964 {
1965 int i;
1966 unsigned long changed;
1967 struct dirstat_dir dir;
1968
1969 if (data->nr == 0)
1970 return;
1971
1972 dir.files = NULL;
1973 dir.alloc = 0;
1974 dir.nr = 0;
1975 dir.permille = options->dirstat_permille;
1976 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1977
1978 changed = 0;
1979 for (i = 0; i < data->nr; i++) {
1980 struct diffstat_file *file = data->files[i];
1981 unsigned long damage = file->added + file->deleted;
1982 if (file->is_binary)
1983 /*
1984 * binary files counts bytes, not lines. Must find some
1985 * way to normalize binary bytes vs. textual lines.
1986 * The following heuristic assumes that there are 64
1987 * bytes per "line".
1988 * This is stupid and ugly, but very cheap...
1989 */
1990 damage = (damage + 63) / 64;
1991 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1992 dir.files[dir.nr].name = file->name;
1993 dir.files[dir.nr].changed = damage;
1994 changed += damage;
1995 dir.nr++;
1996 }
1997
1998 /* This can happen even with many files, if everything was renames */
1999 if (!changed)
2000 return;
2001
2002 /* Show all directories with more than x% of the changes */
2003 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2004 gather_dirstat(options, &dir, changed, "", 0);
2005 }
2006
2007 static void free_diffstat_info(struct diffstat_t *diffstat)
2008 {
2009 int i;
2010 for (i = 0; i < diffstat->nr; i++) {
2011 struct diffstat_file *f = diffstat->files[i];
2012 if (f->name != f->print_name)
2013 free(f->print_name);
2014 free(f->name);
2015 free(f->from_name);
2016 free(f);
2017 }
2018 free(diffstat->files);
2019 }
2020
2021 struct checkdiff_t {
2022 const char *filename;
2023 int lineno;
2024 int conflict_marker_size;
2025 struct diff_options *o;
2026 unsigned ws_rule;
2027 unsigned status;
2028 };
2029
2030 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2031 {
2032 char firstchar;
2033 int cnt;
2034
2035 if (len < marker_size + 1)
2036 return 0;
2037 firstchar = line[0];
2038 switch (firstchar) {
2039 case '=': case '>': case '<': case '|':
2040 break;
2041 default:
2042 return 0;
2043 }
2044 for (cnt = 1; cnt < marker_size; cnt++)
2045 if (line[cnt] != firstchar)
2046 return 0;
2047 /* line[1] thru line[marker_size-1] are same as firstchar */
2048 if (len < marker_size + 1 || !isspace(line[marker_size]))
2049 return 0;
2050 return 1;
2051 }
2052
2053 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2054 {
2055 struct checkdiff_t *data = priv;
2056 int marker_size = data->conflict_marker_size;
2057 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2058 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2059 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2060 char *err;
2061 char *line_prefix = "";
2062 struct strbuf *msgbuf;
2063
2064 assert(data->o);
2065 if (data->o->output_prefix) {
2066 msgbuf = data->o->output_prefix(data->o,
2067 data->o->output_prefix_data);
2068 line_prefix = msgbuf->buf;
2069 }
2070
2071 if (line[0] == '+') {
2072 unsigned bad;
2073 data->lineno++;
2074 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2075 data->status |= 1;
2076 fprintf(data->o->file,
2077 "%s%s:%d: leftover conflict marker\n",
2078 line_prefix, data->filename, data->lineno);
2079 }
2080 bad = ws_check(line + 1, len - 1, data->ws_rule);
2081 if (!bad)
2082 return;
2083 data->status |= bad;
2084 err = whitespace_error_string(bad);
2085 fprintf(data->o->file, "%s%s:%d: %s.\n",
2086 line_prefix, data->filename, data->lineno, err);
2087 free(err);
2088 emit_line(data->o, set, reset, line, 1);
2089 ws_check_emit(line + 1, len - 1, data->ws_rule,
2090 data->o->file, set, reset, ws);
2091 } else if (line[0] == ' ') {
2092 data->lineno++;
2093 } else if (line[0] == '@') {
2094 char *plus = strchr(line, '+');
2095 if (plus)
2096 data->lineno = strtol(plus, NULL, 10) - 1;
2097 else
2098 die("invalid diff");
2099 }
2100 }
2101
2102 static unsigned char *deflate_it(char *data,
2103 unsigned long size,
2104 unsigned long *result_size)
2105 {
2106 int bound;
2107 unsigned char *deflated;
2108 git_zstream stream;
2109
2110 memset(&stream, 0, sizeof(stream));
2111 git_deflate_init(&stream, zlib_compression_level);
2112 bound = git_deflate_bound(&stream, size);
2113 deflated = xmalloc(bound);
2114 stream.next_out = deflated;
2115 stream.avail_out = bound;
2116
2117 stream.next_in = (unsigned char *)data;
2118 stream.avail_in = size;
2119 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2120 ; /* nothing */
2121 git_deflate_end(&stream);
2122 *result_size = stream.total_out;
2123 return deflated;
2124 }
2125
2126 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2127 {
2128 void *cp;
2129 void *delta;
2130 void *deflated;
2131 void *data;
2132 unsigned long orig_size;
2133 unsigned long delta_size;
2134 unsigned long deflate_size;
2135 unsigned long data_size;
2136
2137 /* We could do deflated delta, or we could do just deflated two,
2138 * whichever is smaller.
2139 */
2140 delta = NULL;
2141 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2142 if (one->size && two->size) {
2143 delta = diff_delta(one->ptr, one->size,
2144 two->ptr, two->size,
2145 &delta_size, deflate_size);
2146 if (delta) {
2147 void *to_free = delta;
2148 orig_size = delta_size;
2149 delta = deflate_it(delta, delta_size, &delta_size);
2150 free(to_free);
2151 }
2152 }
2153
2154 if (delta && delta_size < deflate_size) {
2155 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2156 free(deflated);
2157 data = delta;
2158 data_size = delta_size;
2159 }
2160 else {
2161 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2162 free(delta);
2163 data = deflated;
2164 data_size = deflate_size;
2165 }
2166
2167 /* emit data encoded in base85 */
2168 cp = data;
2169 while (data_size) {
2170 int bytes = (52 < data_size) ? 52 : data_size;
2171 char line[70];
2172 data_size -= bytes;
2173 if (bytes <= 26)
2174 line[0] = bytes + 'A' - 1;
2175 else
2176 line[0] = bytes - 26 + 'a' - 1;
2177 encode_85(line + 1, cp, bytes);
2178 cp = (char *) cp + bytes;
2179 fprintf(file, "%s", prefix);
2180 fputs(line, file);
2181 fputc('\n', file);
2182 }
2183 fprintf(file, "%s\n", prefix);
2184 free(data);
2185 }
2186
2187 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2188 {
2189 fprintf(file, "%sGIT binary patch\n", prefix);
2190 emit_binary_diff_body(file, one, two, prefix);
2191 emit_binary_diff_body(file, two, one, prefix);
2192 }
2193
2194 int diff_filespec_is_binary(struct diff_filespec *one)
2195 {
2196 if (one->is_binary == -1) {
2197 diff_filespec_load_driver(one);
2198 if (one->driver->binary != -1)
2199 one->is_binary = one->driver->binary;
2200 else {
2201 if (!one->data && DIFF_FILE_VALID(one))
2202 diff_populate_filespec(one, 0);
2203 if (one->data)
2204 one->is_binary = buffer_is_binary(one->data,
2205 one->size);
2206 if (one->is_binary == -1)
2207 one->is_binary = 0;
2208 }
2209 }
2210 return one->is_binary;
2211 }
2212
2213 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2214 {
2215 diff_filespec_load_driver(one);
2216 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2217 }
2218
2219 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2220 {
2221 if (!options->a_prefix)
2222 options->a_prefix = a;
2223 if (!options->b_prefix)
2224 options->b_prefix = b;
2225 }
2226
2227 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2228 {
2229 if (!DIFF_FILE_VALID(one))
2230 return NULL;
2231
2232 diff_filespec_load_driver(one);
2233 return userdiff_get_textconv(one->driver);
2234 }
2235
2236 static void builtin_diff(const char *name_a,
2237 const char *name_b,
2238 struct diff_filespec *one,
2239 struct diff_filespec *two,
2240 const char *xfrm_msg,
2241 int must_show_header,
2242 struct diff_options *o,
2243 int complete_rewrite)
2244 {
2245 mmfile_t mf1, mf2;
2246 const char *lbl[2];
2247 char *a_one, *b_two;
2248 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2249 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2250 const char *a_prefix, *b_prefix;
2251 struct userdiff_driver *textconv_one = NULL;
2252 struct userdiff_driver *textconv_two = NULL;
2253 struct strbuf header = STRBUF_INIT;
2254 struct strbuf *msgbuf;
2255 char *line_prefix = "";
2256
2257 if (o->output_prefix) {
2258 msgbuf = o->output_prefix(o, o->output_prefix_data);
2259 line_prefix = msgbuf->buf;
2260 }
2261
2262 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2263 (!one->mode || S_ISGITLINK(one->mode)) &&
2264 (!two->mode || S_ISGITLINK(two->mode))) {
2265 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2266 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2267 show_submodule_summary(o->file, one ? one->path : two->path,
2268 one->sha1, two->sha1, two->dirty_submodule,
2269 meta, del, add, reset);
2270 return;
2271 }
2272
2273 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2274 textconv_one = get_textconv(one);
2275 textconv_two = get_textconv(two);
2276 }
2277
2278 diff_set_mnemonic_prefix(o, "a/", "b/");
2279 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2280 a_prefix = o->b_prefix;
2281 b_prefix = o->a_prefix;
2282 } else {
2283 a_prefix = o->a_prefix;
2284 b_prefix = o->b_prefix;
2285 }
2286
2287 /* Never use a non-valid filename anywhere if at all possible */
2288 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2289 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2290
2291 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2292 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2293 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2294 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2295 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2296 if (lbl[0][0] == '/') {
2297 /* /dev/null */
2298 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2299 if (xfrm_msg)
2300 strbuf_addstr(&header, xfrm_msg);
2301 must_show_header = 1;
2302 }
2303 else if (lbl[1][0] == '/') {
2304 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2305 if (xfrm_msg)
2306 strbuf_addstr(&header, xfrm_msg);
2307 must_show_header = 1;
2308 }
2309 else {
2310 if (one->mode != two->mode) {
2311 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2312 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2313 must_show_header = 1;
2314 }
2315 if (xfrm_msg)
2316 strbuf_addstr(&header, xfrm_msg);
2317
2318 /*
2319 * we do not run diff between different kind
2320 * of objects.
2321 */
2322 if ((one->mode ^ two->mode) & S_IFMT)
2323 goto free_ab_and_return;
2324 if (complete_rewrite &&
2325 (textconv_one || !diff_filespec_is_binary(one)) &&
2326 (textconv_two || !diff_filespec_is_binary(two))) {
2327 fprintf(o->file, "%s", header.buf);
2328 strbuf_reset(&header);
2329 emit_rewrite_diff(name_a, name_b, one, two,
2330 textconv_one, textconv_two, o);
2331 o->found_changes = 1;
2332 goto free_ab_and_return;
2333 }
2334 }
2335
2336 if (o->irreversible_delete && lbl[1][0] == '/') {
2337 fprintf(o->file, "%s", header.buf);
2338 strbuf_reset(&header);
2339 goto free_ab_and_return;
2340 } else if (!DIFF_OPT_TST(o, TEXT) &&
2341 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2342 (!textconv_two && diff_filespec_is_binary(two)) )) {
2343 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2344 die("unable to read files to diff");
2345 /* Quite common confusing case */
2346 if (mf1.size == mf2.size &&
2347 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2348 if (must_show_header)
2349 fprintf(o->file, "%s", header.buf);
2350 goto free_ab_and_return;
2351 }
2352 fprintf(o->file, "%s", header.buf);
2353 strbuf_reset(&header);
2354 if (DIFF_OPT_TST(o, BINARY))
2355 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2356 else
2357 fprintf(o->file, "%sBinary files %s and %s differ\n",
2358 line_prefix, lbl[0], lbl[1]);
2359 o->found_changes = 1;
2360 } else {
2361 /* Crazy xdl interfaces.. */
2362 const char *diffopts = getenv("GIT_DIFF_OPTS");
2363 xpparam_t xpp;
2364 xdemitconf_t xecfg;
2365 struct emit_callback ecbdata;
2366 const struct userdiff_funcname *pe;
2367
2368 if (must_show_header) {
2369 fprintf(o->file, "%s", header.buf);
2370 strbuf_reset(&header);
2371 }
2372
2373 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2374 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2375
2376 pe = diff_funcname_pattern(one);
2377 if (!pe)
2378 pe = diff_funcname_pattern(two);
2379
2380 memset(&xpp, 0, sizeof(xpp));
2381 memset(&xecfg, 0, sizeof(xecfg));
2382 memset(&ecbdata, 0, sizeof(ecbdata));
2383 ecbdata.label_path = lbl;
2384 ecbdata.color_diff = want_color(o->use_color);
2385 ecbdata.found_changesp = &o->found_changes;
2386 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2387 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2388 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2389 ecbdata.opt = o;
2390 ecbdata.header = header.len ? &header : NULL;
2391 xpp.flags = o->xdl_opts;
2392 xecfg.ctxlen = o->context;
2393 xecfg.interhunkctxlen = o->interhunkcontext;
2394 xecfg.flags = XDL_EMIT_FUNCNAMES;
2395 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2396 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2397 if (pe)
2398 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2399 if (!diffopts)
2400 ;
2401 else if (!prefixcmp(diffopts, "--unified="))
2402 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2403 else if (!prefixcmp(diffopts, "-u"))
2404 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2405 if (o->word_diff)
2406 init_diff_words_data(&ecbdata, o, one, two);
2407 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2408 &xpp, &xecfg);
2409 if (o->word_diff)
2410 free_diff_words_data(&ecbdata);
2411 if (textconv_one)
2412 free(mf1.ptr);
2413 if (textconv_two)
2414 free(mf2.ptr);
2415 xdiff_clear_find_func(&xecfg);
2416 }
2417
2418 free_ab_and_return:
2419 strbuf_release(&header);
2420 diff_free_filespec_data(one);
2421 diff_free_filespec_data(two);
2422 free(a_one);
2423 free(b_two);
2424 return;
2425 }
2426
2427 static void builtin_diffstat(const char *name_a, const char *name_b,
2428 struct diff_filespec *one,
2429 struct diff_filespec *two,
2430 struct diffstat_t *diffstat,
2431 struct diff_options *o,
2432 struct diff_filepair *p)
2433 {
2434 mmfile_t mf1, mf2;
2435 struct diffstat_file *data;
2436 int same_contents;
2437 int complete_rewrite = 0;
2438
2439 if (!DIFF_PAIR_UNMERGED(p)) {
2440 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2441 complete_rewrite = 1;
2442 }
2443
2444 data = diffstat_add(diffstat, name_a, name_b);
2445 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2446
2447 if (!one || !two) {
2448 data->is_unmerged = 1;
2449 return;
2450 }
2451
2452 same_contents = !hashcmp(one->sha1, two->sha1);
2453
2454 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2455 data->is_binary = 1;
2456 if (same_contents) {
2457 data->added = 0;
2458 data->deleted = 0;
2459 } else {
2460 data->added = diff_filespec_size(two);
2461 data->deleted = diff_filespec_size(one);
2462 }
2463 }
2464
2465 else if (complete_rewrite) {
2466 diff_populate_filespec(one, 0);
2467 diff_populate_filespec(two, 0);
2468 data->deleted = count_lines(one->data, one->size);
2469 data->added = count_lines(two->data, two->size);
2470 }
2471
2472 else if (!same_contents) {
2473 /* Crazy xdl interfaces.. */
2474 xpparam_t xpp;
2475 xdemitconf_t xecfg;
2476
2477 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2478 die("unable to read files to diff");
2479
2480 memset(&xpp, 0, sizeof(xpp));
2481 memset(&xecfg, 0, sizeof(xecfg));
2482 xpp.flags = o->xdl_opts;
2483 xecfg.ctxlen = o->context;
2484 xecfg.interhunkctxlen = o->interhunkcontext;
2485 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2486 &xpp, &xecfg);
2487 }
2488
2489 diff_free_filespec_data(one);
2490 diff_free_filespec_data(two);
2491 }
2492
2493 static void builtin_checkdiff(const char *name_a, const char *name_b,
2494 const char *attr_path,
2495 struct diff_filespec *one,
2496 struct diff_filespec *two,
2497 struct diff_options *o)
2498 {
2499 mmfile_t mf1, mf2;
2500 struct checkdiff_t data;
2501
2502 if (!two)
2503 return;
2504
2505 memset(&data, 0, sizeof(data));
2506 data.filename = name_b ? name_b : name_a;
2507 data.lineno = 0;
2508 data.o = o;
2509 data.ws_rule = whitespace_rule(attr_path);
2510 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2511
2512 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2513 die("unable to read files to diff");
2514
2515 /*
2516 * All the other codepaths check both sides, but not checking
2517 * the "old" side here is deliberate. We are checking the newly
2518 * introduced changes, and as long as the "new" side is text, we
2519 * can and should check what it introduces.
2520 */
2521 if (diff_filespec_is_binary(two))
2522 goto free_and_return;
2523 else {
2524 /* Crazy xdl interfaces.. */
2525 xpparam_t xpp;
2526 xdemitconf_t xecfg;
2527
2528 memset(&xpp, 0, sizeof(xpp));
2529 memset(&xecfg, 0, sizeof(xecfg));
2530 xecfg.ctxlen = 1; /* at least one context line */
2531 xpp.flags = 0;
2532 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2533 &xpp, &xecfg);
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 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, int size_only)
2687 {
2688 int err = 0;
2689 if (!DIFF_FILE_VALID(s))
2690 die("internal error: asking to populate invalid file.");
2691 if (S_ISDIR(s->mode))
2692 return -1;
2693
2694 if (s->data)
2695 return 0;
2696
2697 if (size_only && 0 < s->size)
2698 return 0;
2699
2700 if (S_ISGITLINK(s->mode))
2701 return diff_populate_gitlink(s, size_only);
2702
2703 if (!s->sha1_valid ||
2704 reuse_worktree_file(s->path, s->sha1, 0)) {
2705 struct strbuf buf = STRBUF_INIT;
2706 struct stat st;
2707 int fd;
2708
2709 if (lstat(s->path, &st) < 0) {
2710 if (errno == ENOENT) {
2711 err_empty:
2712 err = -1;
2713 empty:
2714 s->data = (char *)"";
2715 s->size = 0;
2716 return err;
2717 }
2718 }
2719 s->size = xsize_t(st.st_size);
2720 if (!s->size)
2721 goto empty;
2722 if (S_ISLNK(st.st_mode)) {
2723 struct strbuf sb = STRBUF_INIT;
2724
2725 if (strbuf_readlink(&sb, s->path, s->size))
2726 goto err_empty;
2727 s->size = sb.len;
2728 s->data = strbuf_detach(&sb, NULL);
2729 s->should_free = 1;
2730 return 0;
2731 }
2732 if (size_only)
2733 return 0;
2734 fd = open(s->path, O_RDONLY);
2735 if (fd < 0)
2736 goto err_empty;
2737 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2738 close(fd);
2739 s->should_munmap = 1;
2740
2741 /*
2742 * Convert from working tree format to canonical git format
2743 */
2744 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2745 size_t size = 0;
2746 munmap(s->data, s->size);
2747 s->should_munmap = 0;
2748 s->data = strbuf_detach(&buf, &size);
2749 s->size = size;
2750 s->should_free = 1;
2751 }
2752 }
2753 else {
2754 enum object_type type;
2755 if (size_only) {
2756 type = sha1_object_info(s->sha1, &s->size);
2757 if (type < 0)
2758 die("unable to read %s", sha1_to_hex(s->sha1));
2759 } else {
2760 s->data = read_sha1_file(s->sha1, &type, &s->size);
2761 if (!s->data)
2762 die("unable to read %s", sha1_to_hex(s->sha1));
2763 s->should_free = 1;
2764 }
2765 }
2766 return 0;
2767 }
2768
2769 void diff_free_filespec_blob(struct diff_filespec *s)
2770 {
2771 if (s->should_free)
2772 free(s->data);
2773 else if (s->should_munmap)
2774 munmap(s->data, s->size);
2775
2776 if (s->should_free || s->should_munmap) {
2777 s->should_free = s->should_munmap = 0;
2778 s->data = NULL;
2779 }
2780 }
2781
2782 void diff_free_filespec_data(struct diff_filespec *s)
2783 {
2784 diff_free_filespec_blob(s);
2785 free(s->cnt_data);
2786 s->cnt_data = NULL;
2787 }
2788
2789 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2790 void *blob,
2791 unsigned long size,
2792 const unsigned char *sha1,
2793 int mode)
2794 {
2795 int fd;
2796 struct strbuf buf = STRBUF_INIT;
2797 struct strbuf template = STRBUF_INIT;
2798 char *path_dup = xstrdup(path);
2799 const char *base = basename(path_dup);
2800
2801 /* Generate "XXXXXX_basename.ext" */
2802 strbuf_addstr(&template, "XXXXXX_");
2803 strbuf_addstr(&template, base);
2804
2805 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2806 strlen(base) + 1);
2807 if (fd < 0)
2808 die_errno("unable to create temp-file");
2809 if (convert_to_working_tree(path,
2810 (const char *)blob, (size_t)size, &buf)) {
2811 blob = buf.buf;
2812 size = buf.len;
2813 }
2814 if (write_in_full(fd, blob, size) != size)
2815 die_errno("unable to write temp-file");
2816 close(fd);
2817 temp->name = temp->tmp_path;
2818 strcpy(temp->hex, sha1_to_hex(sha1));
2819 temp->hex[40] = 0;
2820 sprintf(temp->mode, "%06o", mode);
2821 strbuf_release(&buf);
2822 strbuf_release(&template);
2823 free(path_dup);
2824 }
2825
2826 static struct diff_tempfile *prepare_temp_file(const char *name,
2827 struct diff_filespec *one)
2828 {
2829 struct diff_tempfile *temp = claim_diff_tempfile();
2830
2831 if (!DIFF_FILE_VALID(one)) {
2832 not_a_valid_file:
2833 /* A '-' entry produces this for file-2, and
2834 * a '+' entry produces this for file-1.
2835 */
2836 temp->name = "/dev/null";
2837 strcpy(temp->hex, ".");
2838 strcpy(temp->mode, ".");
2839 return temp;
2840 }
2841
2842 if (!remove_tempfile_installed) {
2843 atexit(remove_tempfile);
2844 sigchain_push_common(remove_tempfile_on_signal);
2845 remove_tempfile_installed = 1;
2846 }
2847
2848 if (!one->sha1_valid ||
2849 reuse_worktree_file(name, one->sha1, 1)) {
2850 struct stat st;
2851 if (lstat(name, &st) < 0) {
2852 if (errno == ENOENT)
2853 goto not_a_valid_file;
2854 die_errno("stat(%s)", name);
2855 }
2856 if (S_ISLNK(st.st_mode)) {
2857 struct strbuf sb = STRBUF_INIT;
2858 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2859 die_errno("readlink(%s)", name);
2860 prep_temp_blob(name, temp, sb.buf, sb.len,
2861 (one->sha1_valid ?
2862 one->sha1 : null_sha1),
2863 (one->sha1_valid ?
2864 one->mode : S_IFLNK));
2865 strbuf_release(&sb);
2866 }
2867 else {
2868 /* we can borrow from the file in the work tree */
2869 temp->name = name;
2870 if (!one->sha1_valid)
2871 strcpy(temp->hex, sha1_to_hex(null_sha1));
2872 else
2873 strcpy(temp->hex, sha1_to_hex(one->sha1));
2874 /* Even though we may sometimes borrow the
2875 * contents from the work tree, we always want
2876 * one->mode. mode is trustworthy even when
2877 * !(one->sha1_valid), as long as
2878 * DIFF_FILE_VALID(one).
2879 */
2880 sprintf(temp->mode, "%06o", one->mode);
2881 }
2882 return temp;
2883 }
2884 else {
2885 if (diff_populate_filespec(one, 0))
2886 die("cannot read data blob for %s", one->path);
2887 prep_temp_blob(name, temp, one->data, one->size,
2888 one->sha1, one->mode);
2889 }
2890 return temp;
2891 }
2892
2893 /* An external diff command takes:
2894 *
2895 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2896 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2897 *
2898 */
2899 static void run_external_diff(const char *pgm,
2900 const char *name,
2901 const char *other,
2902 struct diff_filespec *one,
2903 struct diff_filespec *two,
2904 const char *xfrm_msg,
2905 int complete_rewrite)
2906 {
2907 const char *spawn_arg[10];
2908 int retval;
2909 const char **arg = &spawn_arg[0];
2910
2911 if (one && two) {
2912 struct diff_tempfile *temp_one, *temp_two;
2913 const char *othername = (other ? other : name);
2914 temp_one = prepare_temp_file(name, one);
2915 temp_two = prepare_temp_file(othername, two);
2916 *arg++ = pgm;
2917 *arg++ = name;
2918 *arg++ = temp_one->name;
2919 *arg++ = temp_one->hex;
2920 *arg++ = temp_one->mode;
2921 *arg++ = temp_two->name;
2922 *arg++ = temp_two->hex;
2923 *arg++ = temp_two->mode;
2924 if (other) {
2925 *arg++ = other;
2926 *arg++ = xfrm_msg;
2927 }
2928 } else {
2929 *arg++ = pgm;
2930 *arg++ = name;
2931 }
2932 *arg = NULL;
2933 fflush(NULL);
2934 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2935 remove_tempfile();
2936 if (retval) {
2937 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2938 exit(1);
2939 }
2940 }
2941
2942 static int similarity_index(struct diff_filepair *p)
2943 {
2944 return p->score * 100 / MAX_SCORE;
2945 }
2946
2947 static void fill_metainfo(struct strbuf *msg,
2948 const char *name,
2949 const char *other,
2950 struct diff_filespec *one,
2951 struct diff_filespec *two,
2952 struct diff_options *o,
2953 struct diff_filepair *p,
2954 int *must_show_header,
2955 int use_color)
2956 {
2957 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2958 const char *reset = diff_get_color(use_color, DIFF_RESET);
2959 struct strbuf *msgbuf;
2960 char *line_prefix = "";
2961
2962 *must_show_header = 1;
2963 if (o->output_prefix) {
2964 msgbuf = o->output_prefix(o, o->output_prefix_data);
2965 line_prefix = msgbuf->buf;
2966 }
2967 strbuf_init(msg, PATH_MAX * 2 + 300);
2968 switch (p->status) {
2969 case DIFF_STATUS_COPIED:
2970 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2971 line_prefix, set, similarity_index(p));
2972 strbuf_addf(msg, "%s\n%s%scopy from ",
2973 reset, line_prefix, set);
2974 quote_c_style(name, msg, NULL, 0);
2975 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2976 quote_c_style(other, msg, NULL, 0);
2977 strbuf_addf(msg, "%s\n", reset);
2978 break;
2979 case DIFF_STATUS_RENAMED:
2980 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2981 line_prefix, set, similarity_index(p));
2982 strbuf_addf(msg, "%s\n%s%srename from ",
2983 reset, line_prefix, set);
2984 quote_c_style(name, msg, NULL, 0);
2985 strbuf_addf(msg, "%s\n%s%srename to ",
2986 reset, line_prefix, set);
2987 quote_c_style(other, msg, NULL, 0);
2988 strbuf_addf(msg, "%s\n", reset);
2989 break;
2990 case DIFF_STATUS_MODIFIED:
2991 if (p->score) {
2992 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2993 line_prefix,
2994 set, similarity_index(p), reset);
2995 break;
2996 }
2997 /* fallthru */
2998 default:
2999 *must_show_header = 0;
3000 }
3001 if (one && two && hashcmp(one->sha1, two->sha1)) {
3002 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3003
3004 if (DIFF_OPT_TST(o, BINARY)) {
3005 mmfile_t mf;
3006 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3007 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3008 abbrev = 40;
3009 }
3010 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3011 find_unique_abbrev(one->sha1, abbrev));
3012 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3013 if (one->mode == two->mode)
3014 strbuf_addf(msg, " %06o", one->mode);
3015 strbuf_addf(msg, "%s\n", reset);
3016 }
3017 }
3018
3019 static void run_diff_cmd(const char *pgm,
3020 const char *name,
3021 const char *other,
3022 const char *attr_path,
3023 struct diff_filespec *one,
3024 struct diff_filespec *two,
3025 struct strbuf *msg,
3026 struct diff_options *o,
3027 struct diff_filepair *p)
3028 {
3029 const char *xfrm_msg = NULL;
3030 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3031 int must_show_header = 0;
3032
3033
3034 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3035 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3036 if (drv && drv->external)
3037 pgm = drv->external;
3038 }
3039
3040 if (msg) {
3041 /*
3042 * don't use colors when the header is intended for an
3043 * external diff driver
3044 */
3045 fill_metainfo(msg, name, other, one, two, o, p,
3046 &must_show_header,
3047 want_color(o->use_color) && !pgm);
3048 xfrm_msg = msg->len ? msg->buf : NULL;
3049 }
3050
3051 if (pgm) {
3052 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3053 complete_rewrite);
3054 return;
3055 }
3056 if (one && two)
3057 builtin_diff(name, other ? other : name,
3058 one, two, xfrm_msg, must_show_header,
3059 o, complete_rewrite);
3060 else
3061 fprintf(o->file, "* Unmerged path %s\n", name);
3062 }
3063
3064 static void diff_fill_sha1_info(struct diff_filespec *one)
3065 {
3066 if (DIFF_FILE_VALID(one)) {
3067 if (!one->sha1_valid) {
3068 struct stat st;
3069 if (one->is_stdin) {
3070 hashcpy(one->sha1, null_sha1);
3071 return;
3072 }
3073 if (lstat(one->path, &st) < 0)
3074 die_errno("stat '%s'", one->path);
3075 if (index_path(one->sha1, one->path, &st, 0))
3076 die("cannot hash %s", one->path);
3077 }
3078 }
3079 else
3080 hashclr(one->sha1);
3081 }
3082
3083 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3084 {
3085 /* Strip the prefix but do not molest /dev/null and absolute paths */
3086 if (*namep && **namep != '/') {
3087 *namep += prefix_length;
3088 if (**namep == '/')
3089 ++*namep;
3090 }
3091 if (*otherp && **otherp != '/') {
3092 *otherp += prefix_length;
3093 if (**otherp == '/')
3094 ++*otherp;
3095 }
3096 }
3097
3098 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3099 {
3100 const char *pgm = external_diff();
3101 struct strbuf msg;
3102 struct diff_filespec *one = p->one;
3103 struct diff_filespec *two = p->two;
3104 const char *name;
3105 const char *other;
3106 const char *attr_path;
3107
3108 name = p->one->path;
3109 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3110 attr_path = name;
3111 if (o->prefix_length)
3112 strip_prefix(o->prefix_length, &name, &other);
3113
3114 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3115 pgm = NULL;
3116
3117 if (DIFF_PAIR_UNMERGED(p)) {
3118 run_diff_cmd(pgm, name, NULL, attr_path,
3119 NULL, NULL, NULL, o, p);
3120 return;
3121 }
3122
3123 diff_fill_sha1_info(one);
3124 diff_fill_sha1_info(two);
3125
3126 if (!pgm &&
3127 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3128 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3129 /*
3130 * a filepair that changes between file and symlink
3131 * needs to be split into deletion and creation.
3132 */
3133 struct diff_filespec *null = alloc_filespec(two->path);
3134 run_diff_cmd(NULL, name, other, attr_path,
3135 one, null, &msg, o, p);
3136 free(null);
3137 strbuf_release(&msg);
3138
3139 null = alloc_filespec(one->path);
3140 run_diff_cmd(NULL, name, other, attr_path,
3141 null, two, &msg, o, p);
3142 free(null);
3143 }
3144 else
3145 run_diff_cmd(pgm, name, other, attr_path,
3146 one, two, &msg, o, p);
3147
3148 strbuf_release(&msg);
3149 }
3150
3151 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3152 struct diffstat_t *diffstat)
3153 {
3154 const char *name;
3155 const char *other;
3156
3157 if (DIFF_PAIR_UNMERGED(p)) {
3158 /* unmerged */
3159 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3160 return;
3161 }
3162
3163 name = p->one->path;
3164 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3165
3166 if (o->prefix_length)
3167 strip_prefix(o->prefix_length, &name, &other);
3168
3169 diff_fill_sha1_info(p->one);
3170 diff_fill_sha1_info(p->two);
3171
3172 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3173 }
3174
3175 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3176 {
3177 const char *name;
3178 const char *other;
3179 const char *attr_path;
3180
3181 if (DIFF_PAIR_UNMERGED(p)) {
3182 /* unmerged */
3183 return;
3184 }
3185
3186 name = p->one->path;
3187 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3188 attr_path = other ? other : name;
3189
3190 if (o->prefix_length)
3191 strip_prefix(o->prefix_length, &name, &other);
3192
3193 diff_fill_sha1_info(p->one);
3194 diff_fill_sha1_info(p->two);
3195
3196 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3197 }
3198
3199 void diff_setup(struct diff_options *options)
3200 {
3201 memcpy(options, &default_diff_options, sizeof(*options));
3202
3203 options->file = stdout;
3204
3205 options->line_termination = '\n';
3206 options->break_opt = -1;
3207 options->rename_limit = -1;
3208 options->dirstat_permille = diff_dirstat_permille_default;
3209 options->context = diff_context_default;
3210 DIFF_OPT_SET(options, RENAME_EMPTY);
3211
3212 options->change = diff_change;
3213 options->add_remove = diff_addremove;
3214 options->use_color = diff_use_color_default;
3215 options->detect_rename = diff_detect_rename_default;
3216
3217 if (diff_no_prefix) {
3218 options->a_prefix = options->b_prefix = "";
3219 } else if (!diff_mnemonic_prefix) {
3220 options->a_prefix = "a/";
3221 options->b_prefix = "b/";
3222 }
3223 }
3224
3225 void diff_setup_done(struct diff_options *options)
3226 {
3227 int count = 0;
3228
3229 if (options->output_format & DIFF_FORMAT_NAME)
3230 count++;
3231 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3232 count++;
3233 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3234 count++;
3235 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3236 count++;
3237 if (count > 1)
3238 die("--name-only, --name-status, --check and -s are mutually exclusive");
3239
3240 /*
3241 * Most of the time we can say "there are changes"
3242 * only by checking if there are changed paths, but
3243 * --ignore-whitespace* options force us to look
3244 * inside contents.
3245 */
3246
3247 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3248 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3249 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3250 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3251 else
3252 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3253
3254 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3255 options->detect_rename = DIFF_DETECT_COPY;
3256
3257 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3258 options->prefix = NULL;
3259 if (options->prefix)
3260 options->prefix_length = strlen(options->prefix);
3261 else
3262 options->prefix_length = 0;
3263
3264 if (options->output_format & (DIFF_FORMAT_NAME |
3265 DIFF_FORMAT_NAME_STATUS |
3266 DIFF_FORMAT_CHECKDIFF |
3267 DIFF_FORMAT_NO_OUTPUT))
3268 options->output_format &= ~(DIFF_FORMAT_RAW |
3269 DIFF_FORMAT_NUMSTAT |
3270 DIFF_FORMAT_DIFFSTAT |
3271 DIFF_FORMAT_SHORTSTAT |
3272 DIFF_FORMAT_DIRSTAT |
3273 DIFF_FORMAT_SUMMARY |
3274 DIFF_FORMAT_PATCH);
3275
3276 /*
3277 * These cases always need recursive; we do not drop caller-supplied
3278 * recursive bits for other formats here.
3279 */
3280 if (options->output_format & (DIFF_FORMAT_PATCH |
3281 DIFF_FORMAT_NUMSTAT |
3282 DIFF_FORMAT_DIFFSTAT |
3283 DIFF_FORMAT_SHORTSTAT |
3284 DIFF_FORMAT_DIRSTAT |
3285 DIFF_FORMAT_SUMMARY |
3286 DIFF_FORMAT_CHECKDIFF))
3287 DIFF_OPT_SET(options, RECURSIVE);
3288 /*
3289 * Also pickaxe would not work very well if you do not say recursive
3290 */
3291 if (options->pickaxe)
3292 DIFF_OPT_SET(options, RECURSIVE);
3293 /*
3294 * When patches are generated, submodules diffed against the work tree
3295 * must be checked for dirtiness too so it can be shown in the output
3296 */
3297 if (options->output_format & DIFF_FORMAT_PATCH)
3298 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3299
3300 if (options->detect_rename && options->rename_limit < 0)
3301 options->rename_limit = diff_rename_limit_default;
3302 if (options->setup & DIFF_SETUP_USE_CACHE) {
3303 if (!active_cache)
3304 /* read-cache does not die even when it fails
3305 * so it is safe for us to do this here. Also
3306 * it does not smudge active_cache or active_nr
3307 * when it fails, so we do not have to worry about
3308 * cleaning it up ourselves either.
3309 */
3310 read_cache();
3311 }
3312 if (options->abbrev <= 0 || 40 < options->abbrev)
3313 options->abbrev = 40; /* full */
3314
3315 /*
3316 * It does not make sense to show the first hit we happened
3317 * to have found. It does not make sense not to return with
3318 * exit code in such a case either.
3319 */
3320 if (DIFF_OPT_TST(options, QUICK)) {
3321 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3322 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3323 }
3324 }
3325
3326 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3327 {
3328 char c, *eq;
3329 int len;
3330
3331 if (*arg != '-')
3332 return 0;
3333 c = *++arg;
3334 if (!c)
3335 return 0;
3336 if (c == arg_short) {
3337 c = *++arg;
3338 if (!c)
3339 return 1;
3340 if (val && isdigit(c)) {
3341 char *end;
3342 int n = strtoul(arg, &end, 10);
3343 if (*end)
3344 return 0;
3345 *val = n;
3346 return 1;
3347 }
3348 return 0;
3349 }
3350 if (c != '-')
3351 return 0;
3352 arg++;
3353 eq = strchr(arg, '=');
3354 if (eq)
3355 len = eq - arg;
3356 else
3357 len = strlen(arg);
3358 if (!len || strncmp(arg, arg_long, len))
3359 return 0;
3360 if (eq) {
3361 int n;
3362 char *end;
3363 if (!isdigit(*++eq))
3364 return 0;
3365 n = strtoul(eq, &end, 10);
3366 if (*end)
3367 return 0;
3368 *val = n;
3369 }
3370 return 1;
3371 }
3372
3373 static int diff_scoreopt_parse(const char *opt);
3374
3375 static inline int short_opt(char opt, const char **argv,
3376 const char **optarg)
3377 {
3378 const char *arg = argv[0];
3379 if (arg[0] != '-' || arg[1] != opt)
3380 return 0;
3381 if (arg[2] != '\0') {
3382 *optarg = arg + 2;
3383 return 1;
3384 }
3385 if (!argv[1])
3386 die("Option '%c' requires a value", opt);
3387 *optarg = argv[1];
3388 return 2;
3389 }
3390
3391 int parse_long_opt(const char *opt, const char **argv,
3392 const char **optarg)
3393 {
3394 const char *arg = argv[0];
3395 if (arg[0] != '-' || arg[1] != '-')
3396 return 0;
3397 arg += strlen("--");
3398 if (prefixcmp(arg, opt))
3399 return 0;
3400 arg += strlen(opt);
3401 if (*arg == '=') { /* sticked form: --option=value */
3402 *optarg = arg + 1;
3403 return 1;
3404 }
3405 if (*arg != '\0')
3406 return 0;
3407 /* separate form: --option value */
3408 if (!argv[1])
3409 die("Option '--%s' requires a value", opt);
3410 *optarg = argv[1];
3411 return 2;
3412 }
3413
3414 static int stat_opt(struct diff_options *options, const char **av)
3415 {
3416 const char *arg = av[0];
3417 char *end;
3418 int width = options->stat_width;
3419 int name_width = options->stat_name_width;
3420 int graph_width = options->stat_graph_width;
3421 int count = options->stat_count;
3422 int argcount = 1;
3423
3424 arg += strlen("--stat");
3425 end = (char *)arg;
3426
3427 switch (*arg) {
3428 case '-':
3429 if (!prefixcmp(arg, "-width")) {
3430 arg += strlen("-width");
3431 if (*arg == '=')
3432 width = strtoul(arg + 1, &end, 10);
3433 else if (!*arg && !av[1])
3434 die("Option '--stat-width' requires a value");
3435 else if (!*arg) {
3436 width = strtoul(av[1], &end, 10);
3437 argcount = 2;
3438 }
3439 } else if (!prefixcmp(arg, "-name-width")) {
3440 arg += strlen("-name-width");
3441 if (*arg == '=')
3442 name_width = strtoul(arg + 1, &end, 10);
3443 else if (!*arg && !av[1])
3444 die("Option '--stat-name-width' requires a value");
3445 else if (!*arg) {
3446 name_width = strtoul(av[1], &end, 10);
3447 argcount = 2;
3448 }
3449 } else if (!prefixcmp(arg, "-graph-width")) {
3450 arg += strlen("-graph-width");
3451 if (*arg == '=')
3452 graph_width = strtoul(arg + 1, &end, 10);
3453 else if (!*arg && !av[1])
3454 die("Option '--stat-graph-width' requires a value");
3455 else if (!*arg) {
3456 graph_width = strtoul(av[1], &end, 10);
3457 argcount = 2;
3458 }
3459 } else if (!prefixcmp(arg, "-count")) {
3460 arg += strlen("-count");
3461 if (*arg == '=')
3462 count = strtoul(arg + 1, &end, 10);
3463 else if (!*arg && !av[1])
3464 die("Option '--stat-count' requires a value");
3465 else if (!*arg) {
3466 count = strtoul(av[1], &end, 10);
3467 argcount = 2;
3468 }
3469 }
3470 break;
3471 case '=':
3472 width = strtoul(arg+1, &end, 10);
3473 if (*end == ',')
3474 name_width = strtoul(end+1, &end, 10);
3475 if (*end == ',')
3476 count = strtoul(end+1, &end, 10);
3477 }
3478
3479 /* Important! This checks all the error cases! */
3480 if (*end)
3481 return 0;
3482 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3483 options->stat_name_width = name_width;
3484 options->stat_graph_width = graph_width;
3485 options->stat_width = width;
3486 options->stat_count = count;
3487 return argcount;
3488 }
3489
3490 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3491 {
3492 struct strbuf errmsg = STRBUF_INIT;
3493 if (parse_dirstat_params(options, params, &errmsg))
3494 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3495 errmsg.buf);
3496 strbuf_release(&errmsg);
3497 /*
3498 * The caller knows a dirstat-related option is given from the command
3499 * line; allow it to say "return this_function();"
3500 */
3501 options->output_format |= DIFF_FORMAT_DIRSTAT;
3502 return 1;
3503 }
3504
3505 static int parse_submodule_opt(struct diff_options *options, const char *value)
3506 {
3507 if (parse_submodule_params(options, value))
3508 die(_("Failed to parse --submodule option parameter: '%s'"),
3509 value);
3510 return 1;
3511 }
3512
3513 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3514 {
3515 const char *arg = av[0];
3516 const char *optarg;
3517 int argcount;
3518
3519 /* Output format options */
3520 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3521 options->output_format |= DIFF_FORMAT_PATCH;
3522 else if (opt_arg(arg, 'U', "unified", &options->context))
3523 options->output_format |= DIFF_FORMAT_PATCH;
3524 else if (!strcmp(arg, "--raw"))
3525 options->output_format |= DIFF_FORMAT_RAW;
3526 else if (!strcmp(arg, "--patch-with-raw"))
3527 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3528 else if (!strcmp(arg, "--numstat"))
3529 options->output_format |= DIFF_FORMAT_NUMSTAT;
3530 else if (!strcmp(arg, "--shortstat"))
3531 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3532 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3533 return parse_dirstat_opt(options, "");
3534 else if (!prefixcmp(arg, "-X"))
3535 return parse_dirstat_opt(options, arg + 2);
3536 else if (!prefixcmp(arg, "--dirstat="))
3537 return parse_dirstat_opt(options, arg + 10);
3538 else if (!strcmp(arg, "--cumulative"))
3539 return parse_dirstat_opt(options, "cumulative");
3540 else if (!strcmp(arg, "--dirstat-by-file"))
3541 return parse_dirstat_opt(options, "files");
3542 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3543 parse_dirstat_opt(options, "files");
3544 return parse_dirstat_opt(options, arg + 18);
3545 }
3546 else if (!strcmp(arg, "--check"))
3547 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3548 else if (!strcmp(arg, "--summary"))
3549 options->output_format |= DIFF_FORMAT_SUMMARY;
3550 else if (!strcmp(arg, "--patch-with-stat"))
3551 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3552 else if (!strcmp(arg, "--name-only"))
3553 options->output_format |= DIFF_FORMAT_NAME;
3554 else if (!strcmp(arg, "--name-status"))
3555 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3556 else if (!strcmp(arg, "-s"))
3557 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3558 else if (!prefixcmp(arg, "--stat"))
3559 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3560 return stat_opt(options, av);
3561
3562 /* renames options */
3563 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3564 !strcmp(arg, "--break-rewrites")) {
3565 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3566 return error("invalid argument to -B: %s", arg+2);
3567 }
3568 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3569 !strcmp(arg, "--find-renames")) {
3570 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3571 return error("invalid argument to -M: %s", arg+2);
3572 options->detect_rename = DIFF_DETECT_RENAME;
3573 }
3574 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3575 options->irreversible_delete = 1;
3576 }
3577 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3578 !strcmp(arg, "--find-copies")) {
3579 if (options->detect_rename == DIFF_DETECT_COPY)
3580 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3581 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3582 return error("invalid argument to -C: %s", arg+2);
3583 options->detect_rename = DIFF_DETECT_COPY;
3584 }
3585 else if (!strcmp(arg, "--no-renames"))
3586 options->detect_rename = 0;
3587 else if (!strcmp(arg, "--rename-empty"))
3588 DIFF_OPT_SET(options, RENAME_EMPTY);
3589 else if (!strcmp(arg, "--no-rename-empty"))
3590 DIFF_OPT_CLR(options, RENAME_EMPTY);
3591 else if (!strcmp(arg, "--relative"))
3592 DIFF_OPT_SET(options, RELATIVE_NAME);
3593 else if (!prefixcmp(arg, "--relative=")) {
3594 DIFF_OPT_SET(options, RELATIVE_NAME);
3595 options->prefix = arg + 11;
3596 }
3597
3598 /* xdiff options */
3599 else if (!strcmp(arg, "--minimal"))
3600 DIFF_XDL_SET(options, NEED_MINIMAL);
3601 else if (!strcmp(arg, "--no-minimal"))
3602 DIFF_XDL_CLR(options, NEED_MINIMAL);
3603 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3604 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3605 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3606 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3607 else if (!strcmp(arg, "--ignore-space-at-eol"))
3608 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3609 else if (!strcmp(arg, "--patience"))
3610 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3611 else if (!strcmp(arg, "--histogram"))
3612 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3613
3614 /* flags options */
3615 else if (!strcmp(arg, "--binary")) {
3616 options->output_format |= DIFF_FORMAT_PATCH;
3617 DIFF_OPT_SET(options, BINARY);
3618 }
3619 else if (!strcmp(arg, "--full-index"))
3620 DIFF_OPT_SET(options, FULL_INDEX);
3621 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3622 DIFF_OPT_SET(options, TEXT);
3623 else if (!strcmp(arg, "-R"))
3624 DIFF_OPT_SET(options, REVERSE_DIFF);
3625 else if (!strcmp(arg, "--find-copies-harder"))
3626 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3627 else if (!strcmp(arg, "--follow"))
3628 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3629 else if (!strcmp(arg, "--no-follow"))
3630 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3631 else if (!strcmp(arg, "--color"))
3632 options->use_color = 1;
3633 else if (!prefixcmp(arg, "--color=")) {
3634 int value = git_config_colorbool(NULL, arg+8);
3635 if (value < 0)
3636 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3637 options->use_color = value;
3638 }
3639 else if (!strcmp(arg, "--no-color"))
3640 options->use_color = 0;
3641 else if (!strcmp(arg, "--color-words")) {
3642 options->use_color = 1;
3643 options->word_diff = DIFF_WORDS_COLOR;
3644 }
3645 else if (!prefixcmp(arg, "--color-words=")) {
3646 options->use_color = 1;
3647 options->word_diff = DIFF_WORDS_COLOR;
3648 options->word_regex = arg + 14;
3649 }
3650 else if (!strcmp(arg, "--word-diff")) {
3651 if (options->word_diff == DIFF_WORDS_NONE)
3652 options->word_diff = DIFF_WORDS_PLAIN;
3653 }
3654 else if (!prefixcmp(arg, "--word-diff=")) {
3655 const char *type = arg + 12;
3656 if (!strcmp(type, "plain"))
3657 options->word_diff = DIFF_WORDS_PLAIN;
3658 else if (!strcmp(type, "color")) {
3659 options->use_color = 1;
3660 options->word_diff = DIFF_WORDS_COLOR;
3661 }
3662 else if (!strcmp(type, "porcelain"))
3663 options->word_diff = DIFF_WORDS_PORCELAIN;
3664 else if (!strcmp(type, "none"))
3665 options->word_diff = DIFF_WORDS_NONE;
3666 else
3667 die("bad --word-diff argument: %s", type);
3668 }
3669 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3670 if (options->word_diff == DIFF_WORDS_NONE)
3671 options->word_diff = DIFF_WORDS_PLAIN;
3672 options->word_regex = optarg;
3673 return argcount;
3674 }
3675 else if (!strcmp(arg, "--exit-code"))
3676 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3677 else if (!strcmp(arg, "--quiet"))
3678 DIFF_OPT_SET(options, QUICK);
3679 else if (!strcmp(arg, "--ext-diff"))
3680 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3681 else if (!strcmp(arg, "--no-ext-diff"))
3682 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3683 else if (!strcmp(arg, "--textconv"))
3684 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3685 else if (!strcmp(arg, "--no-textconv"))
3686 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3687 else if (!strcmp(arg, "--ignore-submodules")) {
3688 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3689 handle_ignore_submodules_arg(options, "all");
3690 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3691 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3692 handle_ignore_submodules_arg(options, arg + 20);
3693 } else if (!strcmp(arg, "--submodule"))
3694 DIFF_OPT_SET(options, SUBMODULE_LOG);
3695 else if (!prefixcmp(arg, "--submodule="))
3696 return parse_submodule_opt(options, arg + 12);
3697
3698 /* misc options */
3699 else if (!strcmp(arg, "-z"))
3700 options->line_termination = 0;
3701 else if ((argcount = short_opt('l', av, &optarg))) {
3702 options->rename_limit = strtoul(optarg, NULL, 10);
3703 return argcount;
3704 }
3705 else if ((argcount = short_opt('S', av, &optarg))) {
3706 options->pickaxe = optarg;
3707 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3708 return argcount;
3709 } else if ((argcount = short_opt('G', av, &optarg))) {
3710 options->pickaxe = optarg;
3711 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3712 return argcount;
3713 }
3714 else if (!strcmp(arg, "--pickaxe-all"))
3715 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3716 else if (!strcmp(arg, "--pickaxe-regex"))
3717 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3718 else if ((argcount = short_opt('O', av, &optarg))) {
3719 options->orderfile = optarg;
3720 return argcount;
3721 }
3722 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3723 options->filter = optarg;
3724 return argcount;
3725 }
3726 else if (!strcmp(arg, "--abbrev"))
3727 options->abbrev = DEFAULT_ABBREV;
3728 else if (!prefixcmp(arg, "--abbrev=")) {
3729 options->abbrev = strtoul(arg + 9, NULL, 10);
3730 if (options->abbrev < MINIMUM_ABBREV)
3731 options->abbrev = MINIMUM_ABBREV;
3732 else if (40 < options->abbrev)
3733 options->abbrev = 40;
3734 }
3735 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3736 options->a_prefix = optarg;
3737 return argcount;
3738 }
3739 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3740 options->b_prefix = optarg;
3741 return argcount;
3742 }
3743 else if (!strcmp(arg, "--no-prefix"))
3744 options->a_prefix = options->b_prefix = "";
3745 else if (opt_arg(arg, '\0', "inter-hunk-context",
3746 &options->interhunkcontext))
3747 ;
3748 else if (!strcmp(arg, "-W"))
3749 DIFF_OPT_SET(options, FUNCCONTEXT);
3750 else if (!strcmp(arg, "--function-context"))
3751 DIFF_OPT_SET(options, FUNCCONTEXT);
3752 else if (!strcmp(arg, "--no-function-context"))
3753 DIFF_OPT_CLR(options, FUNCCONTEXT);
3754 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3755 options->file = fopen(optarg, "w");
3756 if (!options->file)
3757 die_errno("Could not open '%s'", optarg);
3758 options->close_file = 1;
3759 return argcount;
3760 } else
3761 return 0;
3762 return 1;
3763 }
3764
3765 int parse_rename_score(const char **cp_p)
3766 {
3767 unsigned long num, scale;
3768 int ch, dot;
3769 const char *cp = *cp_p;
3770
3771 num = 0;
3772 scale = 1;
3773 dot = 0;
3774 for (;;) {
3775 ch = *cp;
3776 if ( !dot && ch == '.' ) {
3777 scale = 1;
3778 dot = 1;
3779 } else if ( ch == '%' ) {
3780 scale = dot ? scale*100 : 100;
3781 cp++; /* % is always at the end */
3782 break;
3783 } else if ( ch >= '0' && ch <= '9' ) {
3784 if ( scale < 100000 ) {
3785 scale *= 10;
3786 num = (num*10) + (ch-'0');
3787 }
3788 } else {
3789 break;
3790 }
3791 cp++;
3792 }
3793 *cp_p = cp;
3794
3795 /* user says num divided by scale and we say internally that
3796 * is MAX_SCORE * num / scale.
3797 */
3798 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3799 }
3800
3801 static int diff_scoreopt_parse(const char *opt)
3802 {
3803 int opt1, opt2, cmd;
3804
3805 if (*opt++ != '-')
3806 return -1;
3807 cmd = *opt++;
3808 if (cmd == '-') {
3809 /* convert the long-form arguments into short-form versions */
3810 if (!prefixcmp(opt, "break-rewrites")) {
3811 opt += strlen("break-rewrites");
3812 if (*opt == 0 || *opt++ == '=')
3813 cmd = 'B';
3814 } else if (!prefixcmp(opt, "find-copies")) {
3815 opt += strlen("find-copies");
3816 if (*opt == 0 || *opt++ == '=')
3817 cmd = 'C';
3818 } else if (!prefixcmp(opt, "find-renames")) {
3819 opt += strlen("find-renames");
3820 if (*opt == 0 || *opt++ == '=')
3821 cmd = 'M';
3822 }
3823 }
3824 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3825 return -1; /* that is not a -M, -C nor -B option */
3826
3827 opt1 = parse_rename_score(&opt);
3828 if (cmd != 'B')
3829 opt2 = 0;
3830 else {
3831 if (*opt == 0)
3832 opt2 = 0;
3833 else if (*opt != '/')
3834 return -1; /* we expect -B80/99 or -B80 */
3835 else {
3836 opt++;
3837 opt2 = parse_rename_score(&opt);
3838 }
3839 }
3840 if (*opt != 0)
3841 return -1;
3842 return opt1 | (opt2 << 16);
3843 }
3844
3845 struct diff_queue_struct diff_queued_diff;
3846
3847 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3848 {
3849 if (queue->alloc <= queue->nr) {
3850 queue->alloc = alloc_nr(queue->alloc);
3851 queue->queue = xrealloc(queue->queue,
3852 sizeof(dp) * queue->alloc);
3853 }
3854 queue->queue[queue->nr++] = dp;
3855 }
3856
3857 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3858 struct diff_filespec *one,
3859 struct diff_filespec *two)
3860 {
3861 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3862 dp->one = one;
3863 dp->two = two;
3864 if (queue)
3865 diff_q(queue, dp);
3866 return dp;
3867 }
3868
3869 void diff_free_filepair(struct diff_filepair *p)
3870 {
3871 free_filespec(p->one);
3872 free_filespec(p->two);
3873 free(p);
3874 }
3875
3876 /* This is different from find_unique_abbrev() in that
3877 * it stuffs the result with dots for alignment.
3878 */
3879 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3880 {
3881 int abblen;
3882 const char *abbrev;
3883 if (len == 40)
3884 return sha1_to_hex(sha1);
3885
3886 abbrev = find_unique_abbrev(sha1, len);
3887 abblen = strlen(abbrev);
3888 if (abblen < 37) {
3889 static char hex[41];
3890 if (len < abblen && abblen <= len + 2)
3891 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3892 else
3893 sprintf(hex, "%s...", abbrev);
3894 return hex;
3895 }
3896 return sha1_to_hex(sha1);
3897 }
3898
3899 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3900 {
3901 int line_termination = opt->line_termination;
3902 int inter_name_termination = line_termination ? '\t' : '\0';
3903 if (opt->output_prefix) {
3904 struct strbuf *msg = NULL;
3905 msg = opt->output_prefix(opt, opt->output_prefix_data);
3906 fprintf(opt->file, "%s", msg->buf);
3907 }
3908
3909 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3910 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3911 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3912 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3913 }
3914 if (p->score) {
3915 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3916 inter_name_termination);
3917 } else {
3918 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3919 }
3920
3921 if (p->status == DIFF_STATUS_COPIED ||
3922 p->status == DIFF_STATUS_RENAMED) {
3923 const char *name_a, *name_b;
3924 name_a = p->one->path;
3925 name_b = p->two->path;
3926 strip_prefix(opt->prefix_length, &name_a, &name_b);
3927 write_name_quoted(name_a, opt->file, inter_name_termination);
3928 write_name_quoted(name_b, opt->file, line_termination);
3929 } else {
3930 const char *name_a, *name_b;
3931 name_a = p->one->mode ? p->one->path : p->two->path;
3932 name_b = NULL;
3933 strip_prefix(opt->prefix_length, &name_a, &name_b);
3934 write_name_quoted(name_a, opt->file, line_termination);
3935 }
3936 }
3937
3938 int diff_unmodified_pair(struct diff_filepair *p)
3939 {
3940 /* This function is written stricter than necessary to support
3941 * the currently implemented transformers, but the idea is to
3942 * let transformers to produce diff_filepairs any way they want,
3943 * and filter and clean them up here before producing the output.
3944 */
3945 struct diff_filespec *one = p->one, *two = p->two;
3946
3947 if (DIFF_PAIR_UNMERGED(p))
3948 return 0; /* unmerged is interesting */
3949
3950 /* deletion, addition, mode or type change
3951 * and rename are all interesting.
3952 */
3953 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3954 DIFF_PAIR_MODE_CHANGED(p) ||
3955 strcmp(one->path, two->path))
3956 return 0;
3957
3958 /* both are valid and point at the same path. that is, we are
3959 * dealing with a change.
3960 */
3961 if (one->sha1_valid && two->sha1_valid &&
3962 !hashcmp(one->sha1, two->sha1) &&
3963 !one->dirty_submodule && !two->dirty_submodule)
3964 return 1; /* no change */
3965 if (!one->sha1_valid && !two->sha1_valid)
3966 return 1; /* both look at the same file on the filesystem. */
3967 return 0;
3968 }
3969
3970 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3971 {
3972 if (diff_unmodified_pair(p))
3973 return;
3974
3975 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3976 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3977 return; /* no tree diffs in patch format */
3978
3979 run_diff(p, o);
3980 }
3981
3982 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3983 struct diffstat_t *diffstat)
3984 {
3985 if (diff_unmodified_pair(p))
3986 return;
3987
3988 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3989 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3990 return; /* no useful stat for tree diffs */
3991
3992 run_diffstat(p, o, diffstat);
3993 }
3994
3995 static void diff_flush_checkdiff(struct diff_filepair *p,
3996 struct diff_options *o)
3997 {
3998 if (diff_unmodified_pair(p))
3999 return;
4000
4001 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4002 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4003 return; /* nothing to check in tree diffs */
4004
4005 run_checkdiff(p, o);
4006 }
4007
4008 int diff_queue_is_empty(void)
4009 {
4010 struct diff_queue_struct *q = &diff_queued_diff;
4011 int i;
4012 for (i = 0; i < q->nr; i++)
4013 if (!diff_unmodified_pair(q->queue[i]))
4014 return 0;
4015 return 1;
4016 }
4017
4018 #if DIFF_DEBUG
4019 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4020 {
4021 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4022 x, one ? one : "",
4023 s->path,
4024 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4025 s->mode,
4026 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4027 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
4028 x, one ? one : "",
4029 s->size, s->xfrm_flags);
4030 }
4031
4032 void diff_debug_filepair(const struct diff_filepair *p, int i)
4033 {
4034 diff_debug_filespec(p->one, i, "one");
4035 diff_debug_filespec(p->two, i, "two");
4036 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4037 p->score, p->status ? p->status : '?',
4038 p->one->rename_used, p->broken_pair);
4039 }
4040
4041 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4042 {
4043 int i;
4044 if (msg)
4045 fprintf(stderr, "%s\n", msg);
4046 fprintf(stderr, "q->nr = %d\n", q->nr);
4047 for (i = 0; i < q->nr; i++) {
4048 struct diff_filepair *p = q->queue[i];
4049 diff_debug_filepair(p, i);
4050 }
4051 }
4052 #endif
4053
4054 static void diff_resolve_rename_copy(void)
4055 {
4056 int i;
4057 struct diff_filepair *p;
4058 struct diff_queue_struct *q = &diff_queued_diff;
4059
4060 diff_debug_queue("resolve-rename-copy", q);
4061
4062 for (i = 0; i < q->nr; i++) {
4063 p = q->queue[i];
4064 p->status = 0; /* undecided */
4065 if (DIFF_PAIR_UNMERGED(p))
4066 p->status = DIFF_STATUS_UNMERGED;
4067 else if (!DIFF_FILE_VALID(p->one))
4068 p->status = DIFF_STATUS_ADDED;
4069 else if (!DIFF_FILE_VALID(p->two))
4070 p->status = DIFF_STATUS_DELETED;
4071 else if (DIFF_PAIR_TYPE_CHANGED(p))
4072 p->status = DIFF_STATUS_TYPE_CHANGED;
4073
4074 /* from this point on, we are dealing with a pair
4075 * whose both sides are valid and of the same type, i.e.
4076 * either in-place edit or rename/copy edit.
4077 */
4078 else if (DIFF_PAIR_RENAME(p)) {
4079 /*
4080 * A rename might have re-connected a broken
4081 * pair up, causing the pathnames to be the
4082 * same again. If so, that's not a rename at
4083 * all, just a modification..
4084 *
4085 * Otherwise, see if this source was used for
4086 * multiple renames, in which case we decrement
4087 * the count, and call it a copy.
4088 */
4089 if (!strcmp(p->one->path, p->two->path))
4090 p->status = DIFF_STATUS_MODIFIED;
4091 else if (--p->one->rename_used > 0)
4092 p->status = DIFF_STATUS_COPIED;
4093 else
4094 p->status = DIFF_STATUS_RENAMED;
4095 }
4096 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4097 p->one->mode != p->two->mode ||
4098 p->one->dirty_submodule ||
4099 p->two->dirty_submodule ||
4100 is_null_sha1(p->one->sha1))
4101 p->status = DIFF_STATUS_MODIFIED;
4102 else {
4103 /* This is a "no-change" entry and should not
4104 * happen anymore, but prepare for broken callers.
4105 */
4106 error("feeding unmodified %s to diffcore",
4107 p->one->path);
4108 p->status = DIFF_STATUS_UNKNOWN;
4109 }
4110 }
4111 diff_debug_queue("resolve-rename-copy done", q);
4112 }
4113
4114 static int check_pair_status(struct diff_filepair *p)
4115 {
4116 switch (p->status) {
4117 case DIFF_STATUS_UNKNOWN:
4118 return 0;
4119 case 0:
4120 die("internal error in diff-resolve-rename-copy");
4121 default:
4122 return 1;
4123 }
4124 }
4125
4126 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4127 {
4128 int fmt = opt->output_format;
4129
4130 if (fmt & DIFF_FORMAT_CHECKDIFF)
4131 diff_flush_checkdiff(p, opt);
4132 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4133 diff_flush_raw(p, opt);
4134 else if (fmt & DIFF_FORMAT_NAME) {
4135 const char *name_a, *name_b;
4136 name_a = p->two->path;
4137 name_b = NULL;
4138 strip_prefix(opt->prefix_length, &name_a, &name_b);
4139 write_name_quoted(name_a, opt->file, opt->line_termination);
4140 }
4141 }
4142
4143 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4144 {
4145 if (fs->mode)
4146 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4147 else
4148 fprintf(file, " %s ", newdelete);
4149 write_name_quoted(fs->path, file, '\n');
4150 }
4151
4152
4153 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4154 const char *line_prefix)
4155 {
4156 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4157 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4158 p->two->mode, show_name ? ' ' : '\n');
4159 if (show_name) {
4160 write_name_quoted(p->two->path, file, '\n');
4161 }
4162 }
4163 }
4164
4165 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4166 const char *line_prefix)
4167 {
4168 char *names = pprint_rename(p->one->path, p->two->path);
4169
4170 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4171 free(names);
4172 show_mode_change(file, p, 0, line_prefix);
4173 }
4174
4175 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4176 {
4177 FILE *file = opt->file;
4178 char *line_prefix = "";
4179
4180 if (opt->output_prefix) {
4181 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4182 line_prefix = buf->buf;
4183 }
4184
4185 switch(p->status) {
4186 case DIFF_STATUS_DELETED:
4187 fputs(line_prefix, file);
4188 show_file_mode_name(file, "delete", p->one);
4189 break;
4190 case DIFF_STATUS_ADDED:
4191 fputs(line_prefix, file);
4192 show_file_mode_name(file, "create", p->two);
4193 break;
4194 case DIFF_STATUS_COPIED:
4195 fputs(line_prefix, file);
4196 show_rename_copy(file, "copy", p, line_prefix);
4197 break;
4198 case DIFF_STATUS_RENAMED:
4199 fputs(line_prefix, file);
4200 show_rename_copy(file, "rename", p, line_prefix);
4201 break;
4202 default:
4203 if (p->score) {
4204 fprintf(file, "%s rewrite ", line_prefix);
4205 write_name_quoted(p->two->path, file, ' ');
4206 fprintf(file, "(%d%%)\n", similarity_index(p));
4207 }
4208 show_mode_change(file, p, !p->score, line_prefix);
4209 break;
4210 }
4211 }
4212
4213 struct patch_id_t {
4214 git_SHA_CTX *ctx;
4215 int patchlen;
4216 };
4217
4218 static int remove_space(char *line, int len)
4219 {
4220 int i;
4221 char *dst = line;
4222 unsigned char c;
4223
4224 for (i = 0; i < len; i++)
4225 if (!isspace((c = line[i])))
4226 *dst++ = c;
4227
4228 return dst - line;
4229 }
4230
4231 static void patch_id_consume(void *priv, char *line, unsigned long len)
4232 {
4233 struct patch_id_t *data = priv;
4234 int new_len;
4235
4236 /* Ignore line numbers when computing the SHA1 of the patch */
4237 if (!prefixcmp(line, "@@ -"))
4238 return;
4239
4240 new_len = remove_space(line, len);
4241
4242 git_SHA1_Update(data->ctx, line, new_len);
4243 data->patchlen += new_len;
4244 }
4245
4246 /* returns 0 upon success, and writes result into sha1 */
4247 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4248 {
4249 struct diff_queue_struct *q = &diff_queued_diff;
4250 int i;
4251 git_SHA_CTX ctx;
4252 struct patch_id_t data;
4253 char buffer[PATH_MAX * 4 + 20];
4254
4255 git_SHA1_Init(&ctx);
4256 memset(&data, 0, sizeof(struct patch_id_t));
4257 data.ctx = &ctx;
4258
4259 for (i = 0; i < q->nr; i++) {
4260 xpparam_t xpp;
4261 xdemitconf_t xecfg;
4262 mmfile_t mf1, mf2;
4263 struct diff_filepair *p = q->queue[i];
4264 int len1, len2;
4265
4266 memset(&xpp, 0, sizeof(xpp));
4267 memset(&xecfg, 0, sizeof(xecfg));
4268 if (p->status == 0)
4269 return error("internal diff status error");
4270 if (p->status == DIFF_STATUS_UNKNOWN)
4271 continue;
4272 if (diff_unmodified_pair(p))
4273 continue;
4274 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4275 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4276 continue;
4277 if (DIFF_PAIR_UNMERGED(p))
4278 continue;
4279
4280 diff_fill_sha1_info(p->one);
4281 diff_fill_sha1_info(p->two);
4282 if (fill_mmfile(&mf1, p->one) < 0 ||
4283 fill_mmfile(&mf2, p->two) < 0)
4284 return error("unable to read files to diff");
4285
4286 len1 = remove_space(p->one->path, strlen(p->one->path));
4287 len2 = remove_space(p->two->path, strlen(p->two->path));
4288 if (p->one->mode == 0)
4289 len1 = snprintf(buffer, sizeof(buffer),
4290 "diff--gita/%.*sb/%.*s"
4291 "newfilemode%06o"
4292 "---/dev/null"
4293 "+++b/%.*s",
4294 len1, p->one->path,
4295 len2, p->two->path,
4296 p->two->mode,
4297 len2, p->two->path);
4298 else if (p->two->mode == 0)
4299 len1 = snprintf(buffer, sizeof(buffer),
4300 "diff--gita/%.*sb/%.*s"
4301 "deletedfilemode%06o"
4302 "---a/%.*s"
4303 "+++/dev/null",
4304 len1, p->one->path,
4305 len2, p->two->path,
4306 p->one->mode,
4307 len1, p->one->path);
4308 else
4309 len1 = snprintf(buffer, sizeof(buffer),
4310 "diff--gita/%.*sb/%.*s"
4311 "---a/%.*s"
4312 "+++b/%.*s",
4313 len1, p->one->path,
4314 len2, p->two->path,
4315 len1, p->one->path,
4316 len2, p->two->path);
4317 git_SHA1_Update(&ctx, buffer, len1);
4318
4319 if (diff_filespec_is_binary(p->one) ||
4320 diff_filespec_is_binary(p->two)) {
4321 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4322 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4323 continue;
4324 }
4325
4326 xpp.flags = 0;
4327 xecfg.ctxlen = 3;
4328 xecfg.flags = 0;
4329 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4330 &xpp, &xecfg);
4331 }
4332
4333 git_SHA1_Final(sha1, &ctx);
4334 return 0;
4335 }
4336
4337 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4338 {
4339 struct diff_queue_struct *q = &diff_queued_diff;
4340 int i;
4341 int result = diff_get_patch_id(options, sha1);
4342
4343 for (i = 0; i < q->nr; i++)
4344 diff_free_filepair(q->queue[i]);
4345
4346 free(q->queue);
4347 DIFF_QUEUE_CLEAR(q);
4348
4349 return result;
4350 }
4351
4352 static int is_summary_empty(const struct diff_queue_struct *q)
4353 {
4354 int i;
4355
4356 for (i = 0; i < q->nr; i++) {
4357 const struct diff_filepair *p = q->queue[i];
4358
4359 switch (p->status) {
4360 case DIFF_STATUS_DELETED:
4361 case DIFF_STATUS_ADDED:
4362 case DIFF_STATUS_COPIED:
4363 case DIFF_STATUS_RENAMED:
4364 return 0;
4365 default:
4366 if (p->score)
4367 return 0;
4368 if (p->one->mode && p->two->mode &&
4369 p->one->mode != p->two->mode)
4370 return 0;
4371 break;
4372 }
4373 }
4374 return 1;
4375 }
4376
4377 static const char rename_limit_warning[] =
4378 "inexact rename detection was skipped due to too many files.";
4379
4380 static const char degrade_cc_to_c_warning[] =
4381 "only found copies from modified paths due to too many files.";
4382
4383 static const char rename_limit_advice[] =
4384 "you may want to set your %s variable to at least "
4385 "%d and retry the command.";
4386
4387 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4388 {
4389 if (degraded_cc)
4390 warning(degrade_cc_to_c_warning);
4391 else if (needed)
4392 warning(rename_limit_warning);
4393 else
4394 return;
4395 if (0 < needed && needed < 32767)
4396 warning(rename_limit_advice, varname, needed);
4397 }
4398
4399 void diff_flush(struct diff_options *options)
4400 {
4401 struct diff_queue_struct *q = &diff_queued_diff;
4402 int i, output_format = options->output_format;
4403 int separator = 0;
4404 int dirstat_by_line = 0;
4405
4406 /*
4407 * Order: raw, stat, summary, patch
4408 * or: name/name-status/checkdiff (other bits clear)
4409 */
4410 if (!q->nr)
4411 goto free_queue;
4412
4413 if (output_format & (DIFF_FORMAT_RAW |
4414 DIFF_FORMAT_NAME |
4415 DIFF_FORMAT_NAME_STATUS |
4416 DIFF_FORMAT_CHECKDIFF)) {
4417 for (i = 0; i < q->nr; i++) {
4418 struct diff_filepair *p = q->queue[i];
4419 if (check_pair_status(p))
4420 flush_one_pair(p, options);
4421 }
4422 separator++;
4423 }
4424
4425 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4426 dirstat_by_line = 1;
4427
4428 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4429 dirstat_by_line) {
4430 struct diffstat_t diffstat;
4431
4432 memset(&diffstat, 0, sizeof(struct diffstat_t));
4433 for (i = 0; i < q->nr; i++) {
4434 struct diff_filepair *p = q->queue[i];
4435 if (check_pair_status(p))
4436 diff_flush_stat(p, options, &diffstat);
4437 }
4438 if (output_format & DIFF_FORMAT_NUMSTAT)
4439 show_numstat(&diffstat, options);
4440 if (output_format & DIFF_FORMAT_DIFFSTAT)
4441 show_stats(&diffstat, options);
4442 if (output_format & DIFF_FORMAT_SHORTSTAT)
4443 show_shortstats(&diffstat, options);
4444 if (output_format & DIFF_FORMAT_DIRSTAT)
4445 show_dirstat_by_line(&diffstat, options);
4446 free_diffstat_info(&diffstat);
4447 separator++;
4448 }
4449 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4450 show_dirstat(options);
4451
4452 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4453 for (i = 0; i < q->nr; i++) {
4454 diff_summary(options, q->queue[i]);
4455 }
4456 separator++;
4457 }
4458
4459 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4460 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4461 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4462 /*
4463 * run diff_flush_patch for the exit status. setting
4464 * options->file to /dev/null should be safe, becaue we
4465 * aren't supposed to produce any output anyway.
4466 */
4467 if (options->close_file)
4468 fclose(options->file);
4469 options->file = fopen("/dev/null", "w");
4470 if (!options->file)
4471 die_errno("Could not open /dev/null");
4472 options->close_file = 1;
4473 for (i = 0; i < q->nr; i++) {
4474 struct diff_filepair *p = q->queue[i];
4475 if (check_pair_status(p))
4476 diff_flush_patch(p, options);
4477 if (options->found_changes)
4478 break;
4479 }
4480 }
4481
4482 if (output_format & DIFF_FORMAT_PATCH) {
4483 if (separator) {
4484 if (options->output_prefix) {
4485 struct strbuf *msg = NULL;
4486 msg = options->output_prefix(options,
4487 options->output_prefix_data);
4488 fwrite(msg->buf, msg->len, 1, stdout);
4489 }
4490 putc(options->line_termination, options->file);
4491 if (options->stat_sep) {
4492 /* attach patch instead of inline */
4493 fputs(options->stat_sep, options->file);
4494 }
4495 }
4496
4497 for (i = 0; i < q->nr; i++) {
4498 struct diff_filepair *p = q->queue[i];
4499 if (check_pair_status(p))
4500 diff_flush_patch(p, options);
4501 }
4502 }
4503
4504 if (output_format & DIFF_FORMAT_CALLBACK)
4505 options->format_callback(q, options, options->format_callback_data);
4506
4507 for (i = 0; i < q->nr; i++)
4508 diff_free_filepair(q->queue[i]);
4509 free_queue:
4510 free(q->queue);
4511 DIFF_QUEUE_CLEAR(q);
4512 if (options->close_file)
4513 fclose(options->file);
4514
4515 /*
4516 * Report the content-level differences with HAS_CHANGES;
4517 * diff_addremove/diff_change does not set the bit when
4518 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4519 */
4520 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4521 if (options->found_changes)
4522 DIFF_OPT_SET(options, HAS_CHANGES);
4523 else
4524 DIFF_OPT_CLR(options, HAS_CHANGES);
4525 }
4526 }
4527
4528 static void diffcore_apply_filter(const char *filter)
4529 {
4530 int i;
4531 struct diff_queue_struct *q = &diff_queued_diff;
4532 struct diff_queue_struct outq;
4533 DIFF_QUEUE_CLEAR(&outq);
4534
4535 if (!filter)
4536 return;
4537
4538 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4539 int found;
4540 for (i = found = 0; !found && i < q->nr; i++) {
4541 struct diff_filepair *p = q->queue[i];
4542 if (((p->status == DIFF_STATUS_MODIFIED) &&
4543 ((p->score &&
4544 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4545 (!p->score &&
4546 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4547 ((p->status != DIFF_STATUS_MODIFIED) &&
4548 strchr(filter, p->status)))
4549 found++;
4550 }
4551 if (found)
4552 return;
4553
4554 /* otherwise we will clear the whole queue
4555 * by copying the empty outq at the end of this
4556 * function, but first clear the current entries
4557 * in the queue.
4558 */
4559 for (i = 0; i < q->nr; i++)
4560 diff_free_filepair(q->queue[i]);
4561 }
4562 else {
4563 /* Only the matching ones */
4564 for (i = 0; i < q->nr; i++) {
4565 struct diff_filepair *p = q->queue[i];
4566
4567 if (((p->status == DIFF_STATUS_MODIFIED) &&
4568 ((p->score &&
4569 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4570 (!p->score &&
4571 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4572 ((p->status != DIFF_STATUS_MODIFIED) &&
4573 strchr(filter, p->status)))
4574 diff_q(&outq, p);
4575 else
4576 diff_free_filepair(p);
4577 }
4578 }
4579 free(q->queue);
4580 *q = outq;
4581 }
4582
4583 /* Check whether two filespecs with the same mode and size are identical */
4584 static int diff_filespec_is_identical(struct diff_filespec *one,
4585 struct diff_filespec *two)
4586 {
4587 if (S_ISGITLINK(one->mode))
4588 return 0;
4589 if (diff_populate_filespec(one, 0))
4590 return 0;
4591 if (diff_populate_filespec(two, 0))
4592 return 0;
4593 return !memcmp(one->data, two->data, one->size);
4594 }
4595
4596 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4597 {
4598 int i;
4599 struct diff_queue_struct *q = &diff_queued_diff;
4600 struct diff_queue_struct outq;
4601 DIFF_QUEUE_CLEAR(&outq);
4602
4603 for (i = 0; i < q->nr; i++) {
4604 struct diff_filepair *p = q->queue[i];
4605
4606 /*
4607 * 1. Entries that come from stat info dirtiness
4608 * always have both sides (iow, not create/delete),
4609 * one side of the object name is unknown, with
4610 * the same mode and size. Keep the ones that
4611 * do not match these criteria. They have real
4612 * differences.
4613 *
4614 * 2. At this point, the file is known to be modified,
4615 * with the same mode and size, and the object
4616 * name of one side is unknown. Need to inspect
4617 * the identical contents.
4618 */
4619 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4620 !DIFF_FILE_VALID(p->two) ||
4621 (p->one->sha1_valid && p->two->sha1_valid) ||
4622 (p->one->mode != p->two->mode) ||
4623 diff_populate_filespec(p->one, 1) ||
4624 diff_populate_filespec(p->two, 1) ||
4625 (p->one->size != p->two->size) ||
4626 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4627 diff_q(&outq, p);
4628 else {
4629 /*
4630 * The caller can subtract 1 from skip_stat_unmatch
4631 * to determine how many paths were dirty only
4632 * due to stat info mismatch.
4633 */
4634 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4635 diffopt->skip_stat_unmatch++;
4636 diff_free_filepair(p);
4637 }
4638 }
4639 free(q->queue);
4640 *q = outq;
4641 }
4642
4643 static int diffnamecmp(const void *a_, const void *b_)
4644 {
4645 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4646 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4647 const char *name_a, *name_b;
4648
4649 name_a = a->one ? a->one->path : a->two->path;
4650 name_b = b->one ? b->one->path : b->two->path;
4651 return strcmp(name_a, name_b);
4652 }
4653
4654 void diffcore_fix_diff_index(struct diff_options *options)
4655 {
4656 struct diff_queue_struct *q = &diff_queued_diff;
4657 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4658 }
4659
4660 void diffcore_std(struct diff_options *options)
4661 {
4662 if (options->skip_stat_unmatch)
4663 diffcore_skip_stat_unmatch(options);
4664 if (!options->found_follow) {
4665 /* See try_to_follow_renames() in tree-diff.c */
4666 if (options->break_opt != -1)
4667 diffcore_break(options->break_opt);
4668 if (options->detect_rename)
4669 diffcore_rename(options);
4670 if (options->break_opt != -1)
4671 diffcore_merge_broken();
4672 }
4673 if (options->pickaxe)
4674 diffcore_pickaxe(options);
4675 if (options->orderfile)
4676 diffcore_order(options->orderfile);
4677 if (!options->found_follow)
4678 /* See try_to_follow_renames() in tree-diff.c */
4679 diff_resolve_rename_copy();
4680 diffcore_apply_filter(options->filter);
4681
4682 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4683 DIFF_OPT_SET(options, HAS_CHANGES);
4684 else
4685 DIFF_OPT_CLR(options, HAS_CHANGES);
4686
4687 options->found_follow = 0;
4688 }
4689
4690 int diff_result_code(struct diff_options *opt, int status)
4691 {
4692 int result = 0;
4693
4694 diff_warn_rename_limit("diff.renamelimit",
4695 opt->needed_rename_limit,
4696 opt->degraded_cc_to_c);
4697 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4698 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4699 return status;
4700 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4701 DIFF_OPT_TST(opt, HAS_CHANGES))
4702 result |= 01;
4703 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4704 DIFF_OPT_TST(opt, CHECK_FAILED))
4705 result |= 02;
4706 return result;
4707 }
4708
4709 int diff_can_quit_early(struct diff_options *opt)
4710 {
4711 return (DIFF_OPT_TST(opt, QUICK) &&
4712 !opt->filter &&
4713 DIFF_OPT_TST(opt, HAS_CHANGES));
4714 }
4715
4716 /*
4717 * Shall changes to this submodule be ignored?
4718 *
4719 * Submodule changes can be configured to be ignored separately for each path,
4720 * but that configuration can be overridden from the command line.
4721 */
4722 static int is_submodule_ignored(const char *path, struct diff_options *options)
4723 {
4724 int ignored = 0;
4725 unsigned orig_flags = options->flags;
4726 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4727 set_diffopt_flags_from_submodule_config(options, path);
4728 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4729 ignored = 1;
4730 options->flags = orig_flags;
4731 return ignored;
4732 }
4733
4734 void diff_addremove(struct diff_options *options,
4735 int addremove, unsigned mode,
4736 const unsigned char *sha1,
4737 int sha1_valid,
4738 const char *concatpath, unsigned dirty_submodule)
4739 {
4740 struct diff_filespec *one, *two;
4741
4742 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4743 return;
4744
4745 /* This may look odd, but it is a preparation for
4746 * feeding "there are unchanged files which should
4747 * not produce diffs, but when you are doing copy
4748 * detection you would need them, so here they are"
4749 * entries to the diff-core. They will be prefixed
4750 * with something like '=' or '*' (I haven't decided
4751 * which but should not make any difference).
4752 * Feeding the same new and old to diff_change()
4753 * also has the same effect.
4754 * Before the final output happens, they are pruned after
4755 * merged into rename/copy pairs as appropriate.
4756 */
4757 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4758 addremove = (addremove == '+' ? '-' :
4759 addremove == '-' ? '+' : addremove);
4760
4761 if (options->prefix &&
4762 strncmp(concatpath, options->prefix, options->prefix_length))
4763 return;
4764
4765 one = alloc_filespec(concatpath);
4766 two = alloc_filespec(concatpath);
4767
4768 if (addremove != '+')
4769 fill_filespec(one, sha1, sha1_valid, mode);
4770 if (addremove != '-') {
4771 fill_filespec(two, sha1, sha1_valid, mode);
4772 two->dirty_submodule = dirty_submodule;
4773 }
4774
4775 diff_queue(&diff_queued_diff, one, two);
4776 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4777 DIFF_OPT_SET(options, HAS_CHANGES);
4778 }
4779
4780 void diff_change(struct diff_options *options,
4781 unsigned old_mode, unsigned new_mode,
4782 const unsigned char *old_sha1,
4783 const unsigned char *new_sha1,
4784 int old_sha1_valid, int new_sha1_valid,
4785 const char *concatpath,
4786 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4787 {
4788 struct diff_filespec *one, *two;
4789
4790 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4791 is_submodule_ignored(concatpath, options))
4792 return;
4793
4794 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4795 unsigned tmp;
4796 const unsigned char *tmp_c;
4797 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4798 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4799 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4800 new_sha1_valid = tmp;
4801 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4802 new_dirty_submodule = tmp;
4803 }
4804
4805 if (options->prefix &&
4806 strncmp(concatpath, options->prefix, options->prefix_length))
4807 return;
4808
4809 one = alloc_filespec(concatpath);
4810 two = alloc_filespec(concatpath);
4811 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4812 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4813 one->dirty_submodule = old_dirty_submodule;
4814 two->dirty_submodule = new_dirty_submodule;
4815
4816 diff_queue(&diff_queued_diff, one, two);
4817 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4818 DIFF_OPT_SET(options, HAS_CHANGES);
4819 }
4820
4821 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4822 {
4823 struct diff_filepair *pair;
4824 struct diff_filespec *one, *two;
4825
4826 if (options->prefix &&
4827 strncmp(path, options->prefix, options->prefix_length))
4828 return NULL;
4829
4830 one = alloc_filespec(path);
4831 two = alloc_filespec(path);
4832 pair = diff_queue(&diff_queued_diff, one, two);
4833 pair->is_unmerged = 1;
4834 return pair;
4835 }
4836
4837 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4838 size_t *outsize)
4839 {
4840 struct diff_tempfile *temp;
4841 const char *argv[3];
4842 const char **arg = argv;
4843 struct child_process child;
4844 struct strbuf buf = STRBUF_INIT;
4845 int err = 0;
4846
4847 temp = prepare_temp_file(spec->path, spec);
4848 *arg++ = pgm;
4849 *arg++ = temp->name;
4850 *arg = NULL;
4851
4852 memset(&child, 0, sizeof(child));
4853 child.use_shell = 1;
4854 child.argv = argv;
4855 child.out = -1;
4856 if (start_command(&child)) {
4857 remove_tempfile();
4858 return NULL;
4859 }
4860
4861 if (strbuf_read(&buf, child.out, 0) < 0)
4862 err = error("error reading from textconv command '%s'", pgm);
4863 close(child.out);
4864
4865 if (finish_command(&child) || err) {
4866 strbuf_release(&buf);
4867 remove_tempfile();
4868 return NULL;
4869 }
4870 remove_tempfile();
4871
4872 return strbuf_detach(&buf, outsize);
4873 }
4874
4875 size_t fill_textconv(struct userdiff_driver *driver,
4876 struct diff_filespec *df,
4877 char **outbuf)
4878 {
4879 size_t size;
4880
4881 if (!driver || !driver->textconv) {
4882 if (!DIFF_FILE_VALID(df)) {
4883 *outbuf = "";
4884 return 0;
4885 }
4886 if (diff_populate_filespec(df, 0))
4887 die("unable to read files to diff");
4888 *outbuf = df->data;
4889 return df->size;
4890 }
4891
4892 if (driver->textconv_cache && df->sha1_valid) {
4893 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4894 &size);
4895 if (*outbuf)
4896 return size;
4897 }
4898
4899 *outbuf = run_textconv(driver->textconv, df, &size);
4900 if (!*outbuf)
4901 die("unable to read files to diff");
4902
4903 if (driver->textconv_cache && df->sha1_valid) {
4904 /* ignore errors, as we might be in a readonly repository */
4905 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4906 size);
4907 /*
4908 * we could save up changes and flush them all at the end,
4909 * but we would need an extra call after all diffing is done.
4910 * Since generating a cache entry is the slow path anyway,
4911 * this extra overhead probably isn't a big deal.
4912 */
4913 notes_cache_write(driver->textconv_cache);
4914 }
4915
4916 return size;
4917 }
4918
4919 void setup_diff_pager(struct diff_options *opt)
4920 {
4921 /*
4922 * If the user asked for our exit code, then either they want --quiet
4923 * or --exit-code. We should definitely not bother with a pager in the
4924 * former case, as we will generate no output. Since we still properly
4925 * report our exit code even when a pager is run, we _could_ run a
4926 * pager with --exit-code. But since we have not done so historically,
4927 * and because it is easy to find people oneline advising "git diff
4928 * --exit-code" in hooks and other scripts, we do not do so.
4929 */
4930 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4931 check_pager_config("diff") != 0)
4932 setup_pager();
4933 }
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