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git-remote-helpers.txt: document invocation before input format
[git/gitster.git] / diff.c
blobcb1fd9afcc2ece8c5a4123a451a0cb091baae1e3
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 if (!data->files[i]->is_interesting &&
1501 (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; /* min(count, data->nr) */
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 char *name = data->files[i]->print_name;
1617 uintmax_t added = data->files[i]->added;
1618 uintmax_t deleted = data->files[i]->deleted;
1619 int name_len;
1620
1621 if (!data->files[i]->is_interesting &&
1622 (added + deleted == 0)) {
1623 total_files--;
1624 continue;
1625 }
1626 /*
1627 * "scale" the filename
1628 */
1629 len = name_width;
1630 name_len = strlen(name);
1631 if (name_width < name_len) {
1632 char *slash;
1633 prefix = "...";
1634 len -= 3;
1635 name += name_len - len;
1636 slash = strchr(name, '/');
1637 if (slash)
1638 name = slash;
1639 }
1640
1641 if (data->files[i]->is_binary) {
1642 fprintf(options->file, "%s", line_prefix);
1643 show_name(options->file, prefix, name, len);
1644 fprintf(options->file, " %*s", number_width, "Bin");
1645 if (!added && !deleted) {
1646 putc('\n', options->file);
1647 continue;
1648 }
1649 fprintf(options->file, " %s%"PRIuMAX"%s",
1650 del_c, deleted, reset);
1651 fprintf(options->file, " -> ");
1652 fprintf(options->file, "%s%"PRIuMAX"%s",
1653 add_c, added, reset);
1654 fprintf(options->file, " bytes");
1655 fprintf(options->file, "\n");
1656 continue;
1657 }
1658 else if (data->files[i]->is_unmerged) {
1659 fprintf(options->file, "%s", line_prefix);
1660 show_name(options->file, prefix, name, len);
1661 fprintf(options->file, " Unmerged\n");
1662 continue;
1663 }
1664
1665 /*
1666 * scale the add/delete
1667 */
1668 add = added;
1669 del = deleted;
1670 adds += add;
1671 dels += del;
1672
1673 if (graph_width <= max_change) {
1674 int total = add + del;
1675
1676 total = scale_linear(add + del, graph_width, max_change);
1677 if (total < 2 && add && del)
1678 /* width >= 2 due to the sanity check */
1679 total = 2;
1680 if (add < del) {
1681 add = scale_linear(add, graph_width, max_change);
1682 del = total - add;
1683 } else {
1684 del = scale_linear(del, graph_width, max_change);
1685 add = total - del;
1686 }
1687 }
1688 fprintf(options->file, "%s", line_prefix);
1689 show_name(options->file, prefix, name, len);
1690 fprintf(options->file, " %*"PRIuMAX"%s",
1691 number_width, added + deleted,
1692 added + deleted ? " " : "");
1693 show_graph(options->file, '+', add, add_c, reset);
1694 show_graph(options->file, '-', del, del_c, reset);
1695 fprintf(options->file, "\n");
1696 }
1697 for (i = count; i < data->nr; i++) {
1698 uintmax_t added = data->files[i]->added;
1699 uintmax_t deleted = data->files[i]->deleted;
1700 if (!data->files[i]->is_interesting &&
1701 (added + deleted == 0)) {
1702 total_files--;
1703 continue;
1704 }
1705 adds += added;
1706 dels += deleted;
1707 if (!extra_shown)
1708 fprintf(options->file, "%s ...\n", line_prefix);
1709 extra_shown = 1;
1710 }
1711 fprintf(options->file, "%s", line_prefix);
1712 print_stat_summary(options->file, total_files, adds, dels);
1713 }
1714
1715 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1716 {
1717 int i, adds = 0, dels = 0, total_files = data->nr;
1718
1719 if (data->nr == 0)
1720 return;
1721
1722 for (i = 0; i < data->nr; i++) {
1723 int added = data->files[i]->added;
1724 int deleted= data->files[i]->deleted;
1725
1726 if (data->files[i]->is_unmerged)
1727 continue;
1728 if (!data->files[i]->is_interesting && (added + deleted == 0)) {
1729 total_files--;
1730 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1731 adds += added;
1732 dels += deleted;
1733 }
1734 }
1735 if (options->output_prefix) {
1736 struct strbuf *msg = NULL;
1737 msg = options->output_prefix(options,
1738 options->output_prefix_data);
1739 fprintf(options->file, "%s", msg->buf);
1740 }
1741 print_stat_summary(options->file, total_files, adds, dels);
1742 }
1743
1744 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1745 {
1746 int i;
1747
1748 if (data->nr == 0)
1749 return;
1750
1751 for (i = 0; i < data->nr; i++) {
1752 struct diffstat_file *file = data->files[i];
1753
1754 if (options->output_prefix) {
1755 struct strbuf *msg = NULL;
1756 msg = options->output_prefix(options,
1757 options->output_prefix_data);
1758 fprintf(options->file, "%s", msg->buf);
1759 }
1760
1761 if (file->is_binary)
1762 fprintf(options->file, "-\t-\t");
1763 else
1764 fprintf(options->file,
1765 "%"PRIuMAX"\t%"PRIuMAX"\t",
1766 file->added, file->deleted);
1767 if (options->line_termination) {
1768 fill_print_name(file);
1769 if (!file->is_renamed)
1770 write_name_quoted(file->name, options->file,
1771 options->line_termination);
1772 else {
1773 fputs(file->print_name, options->file);
1774 putc(options->line_termination, options->file);
1775 }
1776 } else {
1777 if (file->is_renamed) {
1778 putc('\0', options->file);
1779 write_name_quoted(file->from_name, options->file, '\0');
1780 }
1781 write_name_quoted(file->name, options->file, '\0');
1782 }
1783 }
1784 }
1785
1786 struct dirstat_file {
1787 const char *name;
1788 unsigned long changed;
1789 };
1790
1791 struct dirstat_dir {
1792 struct dirstat_file *files;
1793 int alloc, nr, permille, cumulative;
1794 };
1795
1796 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1797 unsigned long changed, const char *base, int baselen)
1798 {
1799 unsigned long this_dir = 0;
1800 unsigned int sources = 0;
1801 const char *line_prefix = "";
1802 struct strbuf *msg = NULL;
1803
1804 if (opt->output_prefix) {
1805 msg = opt->output_prefix(opt, opt->output_prefix_data);
1806 line_prefix = msg->buf;
1807 }
1808
1809 while (dir->nr) {
1810 struct dirstat_file *f = dir->files;
1811 int namelen = strlen(f->name);
1812 unsigned long this;
1813 char *slash;
1814
1815 if (namelen < baselen)
1816 break;
1817 if (memcmp(f->name, base, baselen))
1818 break;
1819 slash = strchr(f->name + baselen, '/');
1820 if (slash) {
1821 int newbaselen = slash + 1 - f->name;
1822 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1823 sources++;
1824 } else {
1825 this = f->changed;
1826 dir->files++;
1827 dir->nr--;
1828 sources += 2;
1829 }
1830 this_dir += this;
1831 }
1832
1833 /*
1834 * We don't report dirstat's for
1835 * - the top level
1836 * - or cases where everything came from a single directory
1837 * under this directory (sources == 1).
1838 */
1839 if (baselen && sources != 1) {
1840 if (this_dir) {
1841 int permille = this_dir * 1000 / changed;
1842 if (permille >= dir->permille) {
1843 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1844 permille / 10, permille % 10, baselen, base);
1845 if (!dir->cumulative)
1846 return 0;
1847 }
1848 }
1849 }
1850 return this_dir;
1851 }
1852
1853 static int dirstat_compare(const void *_a, const void *_b)
1854 {
1855 const struct dirstat_file *a = _a;
1856 const struct dirstat_file *b = _b;
1857 return strcmp(a->name, b->name);
1858 }
1859
1860 static void show_dirstat(struct diff_options *options)
1861 {
1862 int i;
1863 unsigned long changed;
1864 struct dirstat_dir dir;
1865 struct diff_queue_struct *q = &diff_queued_diff;
1866
1867 dir.files = NULL;
1868 dir.alloc = 0;
1869 dir.nr = 0;
1870 dir.permille = options->dirstat_permille;
1871 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1872
1873 changed = 0;
1874 for (i = 0; i < q->nr; i++) {
1875 struct diff_filepair *p = q->queue[i];
1876 const char *name;
1877 unsigned long copied, added, damage;
1878 int content_changed;
1879
1880 name = p->two->path ? p->two->path : p->one->path;
1881
1882 if (p->one->sha1_valid && p->two->sha1_valid)
1883 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1884 else
1885 content_changed = 1;
1886
1887 if (!content_changed) {
1888 /*
1889 * The SHA1 has not changed, so pre-/post-content is
1890 * identical. We can therefore skip looking at the
1891 * file contents altogether.
1892 */
1893 damage = 0;
1894 goto found_damage;
1895 }
1896
1897 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1898 /*
1899 * In --dirstat-by-file mode, we don't really need to
1900 * look at the actual file contents at all.
1901 * The fact that the SHA1 changed is enough for us to
1902 * add this file to the list of results
1903 * (with each file contributing equal damage).
1904 */
1905 damage = 1;
1906 goto found_damage;
1907 }
1908
1909 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1910 diff_populate_filespec(p->one, 0);
1911 diff_populate_filespec(p->two, 0);
1912 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1913 &copied, &added);
1914 diff_free_filespec_data(p->one);
1915 diff_free_filespec_data(p->two);
1916 } else if (DIFF_FILE_VALID(p->one)) {
1917 diff_populate_filespec(p->one, 1);
1918 copied = added = 0;
1919 diff_free_filespec_data(p->one);
1920 } else if (DIFF_FILE_VALID(p->two)) {
1921 diff_populate_filespec(p->two, 1);
1922 copied = 0;
1923 added = p->two->size;
1924 diff_free_filespec_data(p->two);
1925 } else
1926 continue;
1927
1928 /*
1929 * Original minus copied is the removed material,
1930 * added is the new material. They are both damages
1931 * made to the preimage.
1932 * If the resulting damage is zero, we know that
1933 * diffcore_count_changes() considers the two entries to
1934 * be identical, but since content_changed is true, we
1935 * know that there must have been _some_ kind of change,
1936 * so we force all entries to have damage > 0.
1937 */
1938 damage = (p->one->size - copied) + added;
1939 if (!damage)
1940 damage = 1;
1941
1942 found_damage:
1943 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1944 dir.files[dir.nr].name = name;
1945 dir.files[dir.nr].changed = damage;
1946 changed += damage;
1947 dir.nr++;
1948 }
1949
1950 /* This can happen even with many files, if everything was renames */
1951 if (!changed)
1952 return;
1953
1954 /* Show all directories with more than x% of the changes */
1955 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1956 gather_dirstat(options, &dir, changed, "", 0);
1957 }
1958
1959 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1960 {
1961 int i;
1962 unsigned long changed;
1963 struct dirstat_dir dir;
1964
1965 if (data->nr == 0)
1966 return;
1967
1968 dir.files = NULL;
1969 dir.alloc = 0;
1970 dir.nr = 0;
1971 dir.permille = options->dirstat_permille;
1972 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1973
1974 changed = 0;
1975 for (i = 0; i < data->nr; i++) {
1976 struct diffstat_file *file = data->files[i];
1977 unsigned long damage = file->added + file->deleted;
1978 if (file->is_binary)
1979 /*
1980 * binary files counts bytes, not lines. Must find some
1981 * way to normalize binary bytes vs. textual lines.
1982 * The following heuristic assumes that there are 64
1983 * bytes per "line".
1984 * This is stupid and ugly, but very cheap...
1985 */
1986 damage = (damage + 63) / 64;
1987 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1988 dir.files[dir.nr].name = file->name;
1989 dir.files[dir.nr].changed = damage;
1990 changed += damage;
1991 dir.nr++;
1992 }
1993
1994 /* This can happen even with many files, if everything was renames */
1995 if (!changed)
1996 return;
1997
1998 /* Show all directories with more than x% of the changes */
1999 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2000 gather_dirstat(options, &dir, changed, "", 0);
2001 }
2002
2003 static void free_diffstat_info(struct diffstat_t *diffstat)
2004 {
2005 int i;
2006 for (i = 0; i < diffstat->nr; i++) {
2007 struct diffstat_file *f = diffstat->files[i];
2008 if (f->name != f->print_name)
2009 free(f->print_name);
2010 free(f->name);
2011 free(f->from_name);
2012 free(f);
2013 }
2014 free(diffstat->files);
2015 }
2016
2017 struct checkdiff_t {
2018 const char *filename;
2019 int lineno;
2020 int conflict_marker_size;
2021 struct diff_options *o;
2022 unsigned ws_rule;
2023 unsigned status;
2024 };
2025
2026 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2027 {
2028 char firstchar;
2029 int cnt;
2030
2031 if (len < marker_size + 1)
2032 return 0;
2033 firstchar = line[0];
2034 switch (firstchar) {
2035 case '=': case '>': case '<': case '|':
2036 break;
2037 default:
2038 return 0;
2039 }
2040 for (cnt = 1; cnt < marker_size; cnt++)
2041 if (line[cnt] != firstchar)
2042 return 0;
2043 /* line[1] thru line[marker_size-1] are same as firstchar */
2044 if (len < marker_size + 1 || !isspace(line[marker_size]))
2045 return 0;
2046 return 1;
2047 }
2048
2049 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2050 {
2051 struct checkdiff_t *data = priv;
2052 int marker_size = data->conflict_marker_size;
2053 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2054 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2055 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2056 char *err;
2057 char *line_prefix = "";
2058 struct strbuf *msgbuf;
2059
2060 assert(data->o);
2061 if (data->o->output_prefix) {
2062 msgbuf = data->o->output_prefix(data->o,
2063 data->o->output_prefix_data);
2064 line_prefix = msgbuf->buf;
2065 }
2066
2067 if (line[0] == '+') {
2068 unsigned bad;
2069 data->lineno++;
2070 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2071 data->status |= 1;
2072 fprintf(data->o->file,
2073 "%s%s:%d: leftover conflict marker\n",
2074 line_prefix, data->filename, data->lineno);
2075 }
2076 bad = ws_check(line + 1, len - 1, data->ws_rule);
2077 if (!bad)
2078 return;
2079 data->status |= bad;
2080 err = whitespace_error_string(bad);
2081 fprintf(data->o->file, "%s%s:%d: %s.\n",
2082 line_prefix, data->filename, data->lineno, err);
2083 free(err);
2084 emit_line(data->o, set, reset, line, 1);
2085 ws_check_emit(line + 1, len - 1, data->ws_rule,
2086 data->o->file, set, reset, ws);
2087 } else if (line[0] == ' ') {
2088 data->lineno++;
2089 } else if (line[0] == '@') {
2090 char *plus = strchr(line, '+');
2091 if (plus)
2092 data->lineno = strtol(plus, NULL, 10) - 1;
2093 else
2094 die("invalid diff");
2095 }
2096 }
2097
2098 static unsigned char *deflate_it(char *data,
2099 unsigned long size,
2100 unsigned long *result_size)
2101 {
2102 int bound;
2103 unsigned char *deflated;
2104 git_zstream stream;
2105
2106 memset(&stream, 0, sizeof(stream));
2107 git_deflate_init(&stream, zlib_compression_level);
2108 bound = git_deflate_bound(&stream, size);
2109 deflated = xmalloc(bound);
2110 stream.next_out = deflated;
2111 stream.avail_out = bound;
2112
2113 stream.next_in = (unsigned char *)data;
2114 stream.avail_in = size;
2115 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2116 ; /* nothing */
2117 git_deflate_end(&stream);
2118 *result_size = stream.total_out;
2119 return deflated;
2120 }
2121
2122 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2123 {
2124 void *cp;
2125 void *delta;
2126 void *deflated;
2127 void *data;
2128 unsigned long orig_size;
2129 unsigned long delta_size;
2130 unsigned long deflate_size;
2131 unsigned long data_size;
2132
2133 /* We could do deflated delta, or we could do just deflated two,
2134 * whichever is smaller.
2135 */
2136 delta = NULL;
2137 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2138 if (one->size && two->size) {
2139 delta = diff_delta(one->ptr, one->size,
2140 two->ptr, two->size,
2141 &delta_size, deflate_size);
2142 if (delta) {
2143 void *to_free = delta;
2144 orig_size = delta_size;
2145 delta = deflate_it(delta, delta_size, &delta_size);
2146 free(to_free);
2147 }
2148 }
2149
2150 if (delta && delta_size < deflate_size) {
2151 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2152 free(deflated);
2153 data = delta;
2154 data_size = delta_size;
2155 }
2156 else {
2157 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2158 free(delta);
2159 data = deflated;
2160 data_size = deflate_size;
2161 }
2162
2163 /* emit data encoded in base85 */
2164 cp = data;
2165 while (data_size) {
2166 int bytes = (52 < data_size) ? 52 : data_size;
2167 char line[70];
2168 data_size -= bytes;
2169 if (bytes <= 26)
2170 line[0] = bytes + 'A' - 1;
2171 else
2172 line[0] = bytes - 26 + 'a' - 1;
2173 encode_85(line + 1, cp, bytes);
2174 cp = (char *) cp + bytes;
2175 fprintf(file, "%s", prefix);
2176 fputs(line, file);
2177 fputc('\n', file);
2178 }
2179 fprintf(file, "%s\n", prefix);
2180 free(data);
2181 }
2182
2183 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2184 {
2185 fprintf(file, "%sGIT binary patch\n", prefix);
2186 emit_binary_diff_body(file, one, two, prefix);
2187 emit_binary_diff_body(file, two, one, prefix);
2188 }
2189
2190 int diff_filespec_is_binary(struct diff_filespec *one)
2191 {
2192 if (one->is_binary == -1) {
2193 diff_filespec_load_driver(one);
2194 if (one->driver->binary != -1)
2195 one->is_binary = one->driver->binary;
2196 else {
2197 if (!one->data && DIFF_FILE_VALID(one))
2198 diff_populate_filespec(one, 0);
2199 if (one->data)
2200 one->is_binary = buffer_is_binary(one->data,
2201 one->size);
2202 if (one->is_binary == -1)
2203 one->is_binary = 0;
2204 }
2205 }
2206 return one->is_binary;
2207 }
2208
2209 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2210 {
2211 diff_filespec_load_driver(one);
2212 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2213 }
2214
2215 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2216 {
2217 if (!options->a_prefix)
2218 options->a_prefix = a;
2219 if (!options->b_prefix)
2220 options->b_prefix = b;
2221 }
2222
2223 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2224 {
2225 if (!DIFF_FILE_VALID(one))
2226 return NULL;
2227
2228 diff_filespec_load_driver(one);
2229 return userdiff_get_textconv(one->driver);
2230 }
2231
2232 static void builtin_diff(const char *name_a,
2233 const char *name_b,
2234 struct diff_filespec *one,
2235 struct diff_filespec *two,
2236 const char *xfrm_msg,
2237 int must_show_header,
2238 struct diff_options *o,
2239 int complete_rewrite)
2240 {
2241 mmfile_t mf1, mf2;
2242 const char *lbl[2];
2243 char *a_one, *b_two;
2244 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2245 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2246 const char *a_prefix, *b_prefix;
2247 struct userdiff_driver *textconv_one = NULL;
2248 struct userdiff_driver *textconv_two = NULL;
2249 struct strbuf header = STRBUF_INIT;
2250 struct strbuf *msgbuf;
2251 char *line_prefix = "";
2252
2253 if (o->output_prefix) {
2254 msgbuf = o->output_prefix(o, o->output_prefix_data);
2255 line_prefix = msgbuf->buf;
2256 }
2257
2258 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2259 (!one->mode || S_ISGITLINK(one->mode)) &&
2260 (!two->mode || S_ISGITLINK(two->mode))) {
2261 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2262 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2263 show_submodule_summary(o->file, one ? one->path : two->path,
2264 one->sha1, two->sha1, two->dirty_submodule,
2265 meta, del, add, reset);
2266 return;
2267 }
2268
2269 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2270 textconv_one = get_textconv(one);
2271 textconv_two = get_textconv(two);
2272 }
2273
2274 diff_set_mnemonic_prefix(o, "a/", "b/");
2275 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2276 a_prefix = o->b_prefix;
2277 b_prefix = o->a_prefix;
2278 } else {
2279 a_prefix = o->a_prefix;
2280 b_prefix = o->b_prefix;
2281 }
2282
2283 /* Never use a non-valid filename anywhere if at all possible */
2284 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2285 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2286
2287 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2288 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2289 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2290 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2291 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2292 if (lbl[0][0] == '/') {
2293 /* /dev/null */
2294 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2295 if (xfrm_msg)
2296 strbuf_addstr(&header, xfrm_msg);
2297 must_show_header = 1;
2298 }
2299 else if (lbl[1][0] == '/') {
2300 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2301 if (xfrm_msg)
2302 strbuf_addstr(&header, xfrm_msg);
2303 must_show_header = 1;
2304 }
2305 else {
2306 if (one->mode != two->mode) {
2307 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2308 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2309 must_show_header = 1;
2310 }
2311 if (xfrm_msg)
2312 strbuf_addstr(&header, xfrm_msg);
2313
2314 /*
2315 * we do not run diff between different kind
2316 * of objects.
2317 */
2318 if ((one->mode ^ two->mode) & S_IFMT)
2319 goto free_ab_and_return;
2320 if (complete_rewrite &&
2321 (textconv_one || !diff_filespec_is_binary(one)) &&
2322 (textconv_two || !diff_filespec_is_binary(two))) {
2323 fprintf(o->file, "%s", header.buf);
2324 strbuf_reset(&header);
2325 emit_rewrite_diff(name_a, name_b, one, two,
2326 textconv_one, textconv_two, o);
2327 o->found_changes = 1;
2328 goto free_ab_and_return;
2329 }
2330 }
2331
2332 if (o->irreversible_delete && lbl[1][0] == '/') {
2333 fprintf(o->file, "%s", header.buf);
2334 strbuf_reset(&header);
2335 goto free_ab_and_return;
2336 } else if (!DIFF_OPT_TST(o, TEXT) &&
2337 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2338 (!textconv_two && diff_filespec_is_binary(two)) )) {
2339 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2340 die("unable to read files to diff");
2341 /* Quite common confusing case */
2342 if (mf1.size == mf2.size &&
2343 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2344 if (must_show_header)
2345 fprintf(o->file, "%s", header.buf);
2346 goto free_ab_and_return;
2347 }
2348 fprintf(o->file, "%s", header.buf);
2349 strbuf_reset(&header);
2350 if (DIFF_OPT_TST(o, BINARY))
2351 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2352 else
2353 fprintf(o->file, "%sBinary files %s and %s differ\n",
2354 line_prefix, lbl[0], lbl[1]);
2355 o->found_changes = 1;
2356 } else {
2357 /* Crazy xdl interfaces.. */
2358 const char *diffopts = getenv("GIT_DIFF_OPTS");
2359 xpparam_t xpp;
2360 xdemitconf_t xecfg;
2361 struct emit_callback ecbdata;
2362 const struct userdiff_funcname *pe;
2363
2364 if (must_show_header) {
2365 fprintf(o->file, "%s", header.buf);
2366 strbuf_reset(&header);
2367 }
2368
2369 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2370 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2371
2372 pe = diff_funcname_pattern(one);
2373 if (!pe)
2374 pe = diff_funcname_pattern(two);
2375
2376 memset(&xpp, 0, sizeof(xpp));
2377 memset(&xecfg, 0, sizeof(xecfg));
2378 memset(&ecbdata, 0, sizeof(ecbdata));
2379 ecbdata.label_path = lbl;
2380 ecbdata.color_diff = want_color(o->use_color);
2381 ecbdata.found_changesp = &o->found_changes;
2382 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2383 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2384 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2385 ecbdata.opt = o;
2386 ecbdata.header = header.len ? &header : NULL;
2387 xpp.flags = o->xdl_opts;
2388 xecfg.ctxlen = o->context;
2389 xecfg.interhunkctxlen = o->interhunkcontext;
2390 xecfg.flags = XDL_EMIT_FUNCNAMES;
2391 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2392 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2393 if (pe)
2394 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2395 if (!diffopts)
2396 ;
2397 else if (!prefixcmp(diffopts, "--unified="))
2398 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2399 else if (!prefixcmp(diffopts, "-u"))
2400 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2401 if (o->word_diff)
2402 init_diff_words_data(&ecbdata, o, one, two);
2403 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2404 &xpp, &xecfg);
2405 if (o->word_diff)
2406 free_diff_words_data(&ecbdata);
2407 if (textconv_one)
2408 free(mf1.ptr);
2409 if (textconv_two)
2410 free(mf2.ptr);
2411 xdiff_clear_find_func(&xecfg);
2412 }
2413
2414 free_ab_and_return:
2415 strbuf_release(&header);
2416 diff_free_filespec_data(one);
2417 diff_free_filespec_data(two);
2418 free(a_one);
2419 free(b_two);
2420 return;
2421 }
2422
2423 static void builtin_diffstat(const char *name_a, const char *name_b,
2424 struct diff_filespec *one,
2425 struct diff_filespec *two,
2426 struct diffstat_t *diffstat,
2427 struct diff_options *o,
2428 struct diff_filepair *p)
2429 {
2430 mmfile_t mf1, mf2;
2431 struct diffstat_file *data;
2432 int same_contents;
2433 int complete_rewrite = 0;
2434
2435 if (!DIFF_PAIR_UNMERGED(p)) {
2436 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2437 complete_rewrite = 1;
2438 }
2439
2440 data = diffstat_add(diffstat, name_a, name_b);
2441 data->is_interesting = p->status != 0;
2442
2443 if (!one || !two) {
2444 data->is_unmerged = 1;
2445 return;
2446 }
2447
2448 same_contents = !hashcmp(one->sha1, two->sha1);
2449
2450 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2451 data->is_binary = 1;
2452 if (same_contents) {
2453 data->added = 0;
2454 data->deleted = 0;
2455 } else {
2456 data->added = diff_filespec_size(two);
2457 data->deleted = diff_filespec_size(one);
2458 }
2459 }
2460
2461 else if (complete_rewrite) {
2462 diff_populate_filespec(one, 0);
2463 diff_populate_filespec(two, 0);
2464 data->deleted = count_lines(one->data, one->size);
2465 data->added = count_lines(two->data, two->size);
2466 }
2467
2468 else if (!same_contents) {
2469 /* Crazy xdl interfaces.. */
2470 xpparam_t xpp;
2471 xdemitconf_t xecfg;
2472
2473 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2474 die("unable to read files to diff");
2475
2476 memset(&xpp, 0, sizeof(xpp));
2477 memset(&xecfg, 0, sizeof(xecfg));
2478 xpp.flags = o->xdl_opts;
2479 xecfg.ctxlen = o->context;
2480 xecfg.interhunkctxlen = o->interhunkcontext;
2481 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2482 &xpp, &xecfg);
2483 }
2484
2485 diff_free_filespec_data(one);
2486 diff_free_filespec_data(two);
2487 }
2488
2489 static void builtin_checkdiff(const char *name_a, const char *name_b,
2490 const char *attr_path,
2491 struct diff_filespec *one,
2492 struct diff_filespec *two,
2493 struct diff_options *o)
2494 {
2495 mmfile_t mf1, mf2;
2496 struct checkdiff_t data;
2497
2498 if (!two)
2499 return;
2500
2501 memset(&data, 0, sizeof(data));
2502 data.filename = name_b ? name_b : name_a;
2503 data.lineno = 0;
2504 data.o = o;
2505 data.ws_rule = whitespace_rule(attr_path);
2506 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2507
2508 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2509 die("unable to read files to diff");
2510
2511 /*
2512 * All the other codepaths check both sides, but not checking
2513 * the "old" side here is deliberate. We are checking the newly
2514 * introduced changes, and as long as the "new" side is text, we
2515 * can and should check what it introduces.
2516 */
2517 if (diff_filespec_is_binary(two))
2518 goto free_and_return;
2519 else {
2520 /* Crazy xdl interfaces.. */
2521 xpparam_t xpp;
2522 xdemitconf_t xecfg;
2523
2524 memset(&xpp, 0, sizeof(xpp));
2525 memset(&xecfg, 0, sizeof(xecfg));
2526 xecfg.ctxlen = 1; /* at least one context line */
2527 xpp.flags = 0;
2528 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2529 &xpp, &xecfg);
2530
2531 if (data.ws_rule & WS_BLANK_AT_EOF) {
2532 struct emit_callback ecbdata;
2533 int blank_at_eof;
2534
2535 ecbdata.ws_rule = data.ws_rule;
2536 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2537 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2538
2539 if (blank_at_eof) {
2540 static char *err;
2541 if (!err)
2542 err = whitespace_error_string(WS_BLANK_AT_EOF);
2543 fprintf(o->file, "%s:%d: %s.\n",
2544 data.filename, blank_at_eof, err);
2545 data.status = 1; /* report errors */
2546 }
2547 }
2548 }
2549 free_and_return:
2550 diff_free_filespec_data(one);
2551 diff_free_filespec_data(two);
2552 if (data.status)
2553 DIFF_OPT_SET(o, CHECK_FAILED);
2554 }
2555
2556 struct diff_filespec *alloc_filespec(const char *path)
2557 {
2558 int namelen = strlen(path);
2559 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2560
2561 memset(spec, 0, sizeof(*spec));
2562 spec->path = (char *)(spec + 1);
2563 memcpy(spec->path, path, namelen+1);
2564 spec->count = 1;
2565 spec->is_binary = -1;
2566 return spec;
2567 }
2568
2569 void free_filespec(struct diff_filespec *spec)
2570 {
2571 if (!--spec->count) {
2572 diff_free_filespec_data(spec);
2573 free(spec);
2574 }
2575 }
2576
2577 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2578 int sha1_valid, unsigned short mode)
2579 {
2580 if (mode) {
2581 spec->mode = canon_mode(mode);
2582 hashcpy(spec->sha1, sha1);
2583 spec->sha1_valid = sha1_valid;
2584 }
2585 }
2586
2587 /*
2588 * Given a name and sha1 pair, if the index tells us the file in
2589 * the work tree has that object contents, return true, so that
2590 * prepare_temp_file() does not have to inflate and extract.
2591 */
2592 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2593 {
2594 struct cache_entry *ce;
2595 struct stat st;
2596 int pos, len;
2597
2598 /*
2599 * We do not read the cache ourselves here, because the
2600 * benchmark with my previous version that always reads cache
2601 * shows that it makes things worse for diff-tree comparing
2602 * two linux-2.6 kernel trees in an already checked out work
2603 * tree. This is because most diff-tree comparisons deal with
2604 * only a small number of files, while reading the cache is
2605 * expensive for a large project, and its cost outweighs the
2606 * savings we get by not inflating the object to a temporary
2607 * file. Practically, this code only helps when we are used
2608 * by diff-cache --cached, which does read the cache before
2609 * calling us.
2610 */
2611 if (!active_cache)
2612 return 0;
2613
2614 /* We want to avoid the working directory if our caller
2615 * doesn't need the data in a normal file, this system
2616 * is rather slow with its stat/open/mmap/close syscalls,
2617 * and the object is contained in a pack file. The pack
2618 * is probably already open and will be faster to obtain
2619 * the data through than the working directory. Loose
2620 * objects however would tend to be slower as they need
2621 * to be individually opened and inflated.
2622 */
2623 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2624 return 0;
2625
2626 len = strlen(name);
2627 pos = cache_name_pos(name, len);
2628 if (pos < 0)
2629 return 0;
2630 ce = active_cache[pos];
2631
2632 /*
2633 * This is not the sha1 we are looking for, or
2634 * unreusable because it is not a regular file.
2635 */
2636 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2637 return 0;
2638
2639 /*
2640 * If ce is marked as "assume unchanged", there is no
2641 * guarantee that work tree matches what we are looking for.
2642 */
2643 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2644 return 0;
2645
2646 /*
2647 * If ce matches the file in the work tree, we can reuse it.
2648 */
2649 if (ce_uptodate(ce) ||
2650 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2651 return 1;
2652
2653 return 0;
2654 }
2655
2656 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2657 {
2658 int len;
2659 char *data = xmalloc(100), *dirty = "";
2660
2661 /* Are we looking at the work tree? */
2662 if (s->dirty_submodule)
2663 dirty = "-dirty";
2664
2665 len = snprintf(data, 100,
2666 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2667 s->data = data;
2668 s->size = len;
2669 s->should_free = 1;
2670 if (size_only) {
2671 s->data = NULL;
2672 free(data);
2673 }
2674 return 0;
2675 }
2676
2677 /*
2678 * While doing rename detection and pickaxe operation, we may need to
2679 * grab the data for the blob (or file) for our own in-core comparison.
2680 * diff_filespec has data and size fields for this purpose.
2681 */
2682 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2683 {
2684 int err = 0;
2685 if (!DIFF_FILE_VALID(s))
2686 die("internal error: asking to populate invalid file.");
2687 if (S_ISDIR(s->mode))
2688 return -1;
2689
2690 if (s->data)
2691 return 0;
2692
2693 if (size_only && 0 < s->size)
2694 return 0;
2695
2696 if (S_ISGITLINK(s->mode))
2697 return diff_populate_gitlink(s, size_only);
2698
2699 if (!s->sha1_valid ||
2700 reuse_worktree_file(s->path, s->sha1, 0)) {
2701 struct strbuf buf = STRBUF_INIT;
2702 struct stat st;
2703 int fd;
2704
2705 if (lstat(s->path, &st) < 0) {
2706 if (errno == ENOENT) {
2707 err_empty:
2708 err = -1;
2709 empty:
2710 s->data = (char *)"";
2711 s->size = 0;
2712 return err;
2713 }
2714 }
2715 s->size = xsize_t(st.st_size);
2716 if (!s->size)
2717 goto empty;
2718 if (S_ISLNK(st.st_mode)) {
2719 struct strbuf sb = STRBUF_INIT;
2720
2721 if (strbuf_readlink(&sb, s->path, s->size))
2722 goto err_empty;
2723 s->size = sb.len;
2724 s->data = strbuf_detach(&sb, NULL);
2725 s->should_free = 1;
2726 return 0;
2727 }
2728 if (size_only)
2729 return 0;
2730 fd = open(s->path, O_RDONLY);
2731 if (fd < 0)
2732 goto err_empty;
2733 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2734 close(fd);
2735 s->should_munmap = 1;
2736
2737 /*
2738 * Convert from working tree format to canonical git format
2739 */
2740 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2741 size_t size = 0;
2742 munmap(s->data, s->size);
2743 s->should_munmap = 0;
2744 s->data = strbuf_detach(&buf, &size);
2745 s->size = size;
2746 s->should_free = 1;
2747 }
2748 }
2749 else {
2750 enum object_type type;
2751 if (size_only) {
2752 type = sha1_object_info(s->sha1, &s->size);
2753 if (type < 0)
2754 die("unable to read %s", sha1_to_hex(s->sha1));
2755 } else {
2756 s->data = read_sha1_file(s->sha1, &type, &s->size);
2757 if (!s->data)
2758 die("unable to read %s", sha1_to_hex(s->sha1));
2759 s->should_free = 1;
2760 }
2761 }
2762 return 0;
2763 }
2764
2765 void diff_free_filespec_blob(struct diff_filespec *s)
2766 {
2767 if (s->should_free)
2768 free(s->data);
2769 else if (s->should_munmap)
2770 munmap(s->data, s->size);
2771
2772 if (s->should_free || s->should_munmap) {
2773 s->should_free = s->should_munmap = 0;
2774 s->data = NULL;
2775 }
2776 }
2777
2778 void diff_free_filespec_data(struct diff_filespec *s)
2779 {
2780 diff_free_filespec_blob(s);
2781 free(s->cnt_data);
2782 s->cnt_data = NULL;
2783 }
2784
2785 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2786 void *blob,
2787 unsigned long size,
2788 const unsigned char *sha1,
2789 int mode)
2790 {
2791 int fd;
2792 struct strbuf buf = STRBUF_INIT;
2793 struct strbuf template = STRBUF_INIT;
2794 char *path_dup = xstrdup(path);
2795 const char *base = basename(path_dup);
2796
2797 /* Generate "XXXXXX_basename.ext" */
2798 strbuf_addstr(&template, "XXXXXX_");
2799 strbuf_addstr(&template, base);
2800
2801 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2802 strlen(base) + 1);
2803 if (fd < 0)
2804 die_errno("unable to create temp-file");
2805 if (convert_to_working_tree(path,
2806 (const char *)blob, (size_t)size, &buf)) {
2807 blob = buf.buf;
2808 size = buf.len;
2809 }
2810 if (write_in_full(fd, blob, size) != size)
2811 die_errno("unable to write temp-file");
2812 close(fd);
2813 temp->name = temp->tmp_path;
2814 strcpy(temp->hex, sha1_to_hex(sha1));
2815 temp->hex[40] = 0;
2816 sprintf(temp->mode, "%06o", mode);
2817 strbuf_release(&buf);
2818 strbuf_release(&template);
2819 free(path_dup);
2820 }
2821
2822 static struct diff_tempfile *prepare_temp_file(const char *name,
2823 struct diff_filespec *one)
2824 {
2825 struct diff_tempfile *temp = claim_diff_tempfile();
2826
2827 if (!DIFF_FILE_VALID(one)) {
2828 not_a_valid_file:
2829 /* A '-' entry produces this for file-2, and
2830 * a '+' entry produces this for file-1.
2831 */
2832 temp->name = "/dev/null";
2833 strcpy(temp->hex, ".");
2834 strcpy(temp->mode, ".");
2835 return temp;
2836 }
2837
2838 if (!remove_tempfile_installed) {
2839 atexit(remove_tempfile);
2840 sigchain_push_common(remove_tempfile_on_signal);
2841 remove_tempfile_installed = 1;
2842 }
2843
2844 if (!one->sha1_valid ||
2845 reuse_worktree_file(name, one->sha1, 1)) {
2846 struct stat st;
2847 if (lstat(name, &st) < 0) {
2848 if (errno == ENOENT)
2849 goto not_a_valid_file;
2850 die_errno("stat(%s)", name);
2851 }
2852 if (S_ISLNK(st.st_mode)) {
2853 struct strbuf sb = STRBUF_INIT;
2854 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2855 die_errno("readlink(%s)", name);
2856 prep_temp_blob(name, temp, sb.buf, sb.len,
2857 (one->sha1_valid ?
2858 one->sha1 : null_sha1),
2859 (one->sha1_valid ?
2860 one->mode : S_IFLNK));
2861 strbuf_release(&sb);
2862 }
2863 else {
2864 /* we can borrow from the file in the work tree */
2865 temp->name = name;
2866 if (!one->sha1_valid)
2867 strcpy(temp->hex, sha1_to_hex(null_sha1));
2868 else
2869 strcpy(temp->hex, sha1_to_hex(one->sha1));
2870 /* Even though we may sometimes borrow the
2871 * contents from the work tree, we always want
2872 * one->mode. mode is trustworthy even when
2873 * !(one->sha1_valid), as long as
2874 * DIFF_FILE_VALID(one).
2875 */
2876 sprintf(temp->mode, "%06o", one->mode);
2877 }
2878 return temp;
2879 }
2880 else {
2881 if (diff_populate_filespec(one, 0))
2882 die("cannot read data blob for %s", one->path);
2883 prep_temp_blob(name, temp, one->data, one->size,
2884 one->sha1, one->mode);
2885 }
2886 return temp;
2887 }
2888
2889 /* An external diff command takes:
2890 *
2891 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2892 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2893 *
2894 */
2895 static void run_external_diff(const char *pgm,
2896 const char *name,
2897 const char *other,
2898 struct diff_filespec *one,
2899 struct diff_filespec *two,
2900 const char *xfrm_msg,
2901 int complete_rewrite)
2902 {
2903 const char *spawn_arg[10];
2904 int retval;
2905 const char **arg = &spawn_arg[0];
2906
2907 if (one && two) {
2908 struct diff_tempfile *temp_one, *temp_two;
2909 const char *othername = (other ? other : name);
2910 temp_one = prepare_temp_file(name, one);
2911 temp_two = prepare_temp_file(othername, two);
2912 *arg++ = pgm;
2913 *arg++ = name;
2914 *arg++ = temp_one->name;
2915 *arg++ = temp_one->hex;
2916 *arg++ = temp_one->mode;
2917 *arg++ = temp_two->name;
2918 *arg++ = temp_two->hex;
2919 *arg++ = temp_two->mode;
2920 if (other) {
2921 *arg++ = other;
2922 *arg++ = xfrm_msg;
2923 }
2924 } else {
2925 *arg++ = pgm;
2926 *arg++ = name;
2927 }
2928 *arg = NULL;
2929 fflush(NULL);
2930 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2931 remove_tempfile();
2932 if (retval) {
2933 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2934 exit(1);
2935 }
2936 }
2937
2938 static int similarity_index(struct diff_filepair *p)
2939 {
2940 return p->score * 100 / MAX_SCORE;
2941 }
2942
2943 static void fill_metainfo(struct strbuf *msg,
2944 const char *name,
2945 const char *other,
2946 struct diff_filespec *one,
2947 struct diff_filespec *two,
2948 struct diff_options *o,
2949 struct diff_filepair *p,
2950 int *must_show_header,
2951 int use_color)
2952 {
2953 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2954 const char *reset = diff_get_color(use_color, DIFF_RESET);
2955 struct strbuf *msgbuf;
2956 char *line_prefix = "";
2957
2958 *must_show_header = 1;
2959 if (o->output_prefix) {
2960 msgbuf = o->output_prefix(o, o->output_prefix_data);
2961 line_prefix = msgbuf->buf;
2962 }
2963 strbuf_init(msg, PATH_MAX * 2 + 300);
2964 switch (p->status) {
2965 case DIFF_STATUS_COPIED:
2966 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2967 line_prefix, set, similarity_index(p));
2968 strbuf_addf(msg, "%s\n%s%scopy from ",
2969 reset, line_prefix, set);
2970 quote_c_style(name, msg, NULL, 0);
2971 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2972 quote_c_style(other, msg, NULL, 0);
2973 strbuf_addf(msg, "%s\n", reset);
2974 break;
2975 case DIFF_STATUS_RENAMED:
2976 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2977 line_prefix, set, similarity_index(p));
2978 strbuf_addf(msg, "%s\n%s%srename from ",
2979 reset, line_prefix, set);
2980 quote_c_style(name, msg, NULL, 0);
2981 strbuf_addf(msg, "%s\n%s%srename to ",
2982 reset, line_prefix, set);
2983 quote_c_style(other, msg, NULL, 0);
2984 strbuf_addf(msg, "%s\n", reset);
2985 break;
2986 case DIFF_STATUS_MODIFIED:
2987 if (p->score) {
2988 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2989 line_prefix,
2990 set, similarity_index(p), reset);
2991 break;
2992 }
2993 /* fallthru */
2994 default:
2995 *must_show_header = 0;
2996 }
2997 if (one && two && hashcmp(one->sha1, two->sha1)) {
2998 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2999
3000 if (DIFF_OPT_TST(o, BINARY)) {
3001 mmfile_t mf;
3002 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3003 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3004 abbrev = 40;
3005 }
3006 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3007 find_unique_abbrev(one->sha1, abbrev));
3008 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3009 if (one->mode == two->mode)
3010 strbuf_addf(msg, " %06o", one->mode);
3011 strbuf_addf(msg, "%s\n", reset);
3012 }
3013 }
3014
3015 static void run_diff_cmd(const char *pgm,
3016 const char *name,
3017 const char *other,
3018 const char *attr_path,
3019 struct diff_filespec *one,
3020 struct diff_filespec *two,
3021 struct strbuf *msg,
3022 struct diff_options *o,
3023 struct diff_filepair *p)
3024 {
3025 const char *xfrm_msg = NULL;
3026 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3027 int must_show_header = 0;
3028
3029
3030 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3031 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3032 if (drv && drv->external)
3033 pgm = drv->external;
3034 }
3035
3036 if (msg) {
3037 /*
3038 * don't use colors when the header is intended for an
3039 * external diff driver
3040 */
3041 fill_metainfo(msg, name, other, one, two, o, p,
3042 &must_show_header,
3043 want_color(o->use_color) && !pgm);
3044 xfrm_msg = msg->len ? msg->buf : NULL;
3045 }
3046
3047 if (pgm) {
3048 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3049 complete_rewrite);
3050 return;
3051 }
3052 if (one && two)
3053 builtin_diff(name, other ? other : name,
3054 one, two, xfrm_msg, must_show_header,
3055 o, complete_rewrite);
3056 else
3057 fprintf(o->file, "* Unmerged path %s\n", name);
3058 }
3059
3060 static void diff_fill_sha1_info(struct diff_filespec *one)
3061 {
3062 if (DIFF_FILE_VALID(one)) {
3063 if (!one->sha1_valid) {
3064 struct stat st;
3065 if (one->is_stdin) {
3066 hashcpy(one->sha1, null_sha1);
3067 return;
3068 }
3069 if (lstat(one->path, &st) < 0)
3070 die_errno("stat '%s'", one->path);
3071 if (index_path(one->sha1, one->path, &st, 0))
3072 die("cannot hash %s", one->path);
3073 }
3074 }
3075 else
3076 hashclr(one->sha1);
3077 }
3078
3079 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3080 {
3081 /* Strip the prefix but do not molest /dev/null and absolute paths */
3082 if (*namep && **namep != '/') {
3083 *namep += prefix_length;
3084 if (**namep == '/')
3085 ++*namep;
3086 }
3087 if (*otherp && **otherp != '/') {
3088 *otherp += prefix_length;
3089 if (**otherp == '/')
3090 ++*otherp;
3091 }
3092 }
3093
3094 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3095 {
3096 const char *pgm = external_diff();
3097 struct strbuf msg;
3098 struct diff_filespec *one = p->one;
3099 struct diff_filespec *two = p->two;
3100 const char *name;
3101 const char *other;
3102 const char *attr_path;
3103
3104 name = p->one->path;
3105 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3106 attr_path = name;
3107 if (o->prefix_length)
3108 strip_prefix(o->prefix_length, &name, &other);
3109
3110 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3111 pgm = NULL;
3112
3113 if (DIFF_PAIR_UNMERGED(p)) {
3114 run_diff_cmd(pgm, name, NULL, attr_path,
3115 NULL, NULL, NULL, o, p);
3116 return;
3117 }
3118
3119 diff_fill_sha1_info(one);
3120 diff_fill_sha1_info(two);
3121
3122 if (!pgm &&
3123 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3124 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3125 /*
3126 * a filepair that changes between file and symlink
3127 * needs to be split into deletion and creation.
3128 */
3129 struct diff_filespec *null = alloc_filespec(two->path);
3130 run_diff_cmd(NULL, name, other, attr_path,
3131 one, null, &msg, o, p);
3132 free(null);
3133 strbuf_release(&msg);
3134
3135 null = alloc_filespec(one->path);
3136 run_diff_cmd(NULL, name, other, attr_path,
3137 null, two, &msg, o, p);
3138 free(null);
3139 }
3140 else
3141 run_diff_cmd(pgm, name, other, attr_path,
3142 one, two, &msg, o, p);
3143
3144 strbuf_release(&msg);
3145 }
3146
3147 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3148 struct diffstat_t *diffstat)
3149 {
3150 const char *name;
3151 const char *other;
3152
3153 if (DIFF_PAIR_UNMERGED(p)) {
3154 /* unmerged */
3155 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3156 return;
3157 }
3158
3159 name = p->one->path;
3160 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3161
3162 if (o->prefix_length)
3163 strip_prefix(o->prefix_length, &name, &other);
3164
3165 diff_fill_sha1_info(p->one);
3166 diff_fill_sha1_info(p->two);
3167
3168 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3169 }
3170
3171 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3172 {
3173 const char *name;
3174 const char *other;
3175 const char *attr_path;
3176
3177 if (DIFF_PAIR_UNMERGED(p)) {
3178 /* unmerged */
3179 return;
3180 }
3181
3182 name = p->one->path;
3183 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3184 attr_path = other ? other : name;
3185
3186 if (o->prefix_length)
3187 strip_prefix(o->prefix_length, &name, &other);
3188
3189 diff_fill_sha1_info(p->one);
3190 diff_fill_sha1_info(p->two);
3191
3192 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3193 }
3194
3195 void diff_setup(struct diff_options *options)
3196 {
3197 memcpy(options, &default_diff_options, sizeof(*options));
3198
3199 options->file = stdout;
3200
3201 options->line_termination = '\n';
3202 options->break_opt = -1;
3203 options->rename_limit = -1;
3204 options->dirstat_permille = diff_dirstat_permille_default;
3205 options->context = diff_context_default;
3206 DIFF_OPT_SET(options, RENAME_EMPTY);
3207
3208 options->change = diff_change;
3209 options->add_remove = diff_addremove;
3210 options->use_color = diff_use_color_default;
3211 options->detect_rename = diff_detect_rename_default;
3212
3213 if (diff_no_prefix) {
3214 options->a_prefix = options->b_prefix = "";
3215 } else if (!diff_mnemonic_prefix) {
3216 options->a_prefix = "a/";
3217 options->b_prefix = "b/";
3218 }
3219 }
3220
3221 void diff_setup_done(struct diff_options *options)
3222 {
3223 int count = 0;
3224
3225 if (options->output_format & DIFF_FORMAT_NAME)
3226 count++;
3227 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3228 count++;
3229 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3230 count++;
3231 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3232 count++;
3233 if (count > 1)
3234 die("--name-only, --name-status, --check and -s are mutually exclusive");
3235
3236 /*
3237 * Most of the time we can say "there are changes"
3238 * only by checking if there are changed paths, but
3239 * --ignore-whitespace* options force us to look
3240 * inside contents.
3241 */
3242
3243 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3244 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3245 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3246 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3247 else
3248 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3249
3250 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3251 options->detect_rename = DIFF_DETECT_COPY;
3252
3253 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3254 options->prefix = NULL;
3255 if (options->prefix)
3256 options->prefix_length = strlen(options->prefix);
3257 else
3258 options->prefix_length = 0;
3259
3260 if (options->output_format & (DIFF_FORMAT_NAME |
3261 DIFF_FORMAT_NAME_STATUS |
3262 DIFF_FORMAT_CHECKDIFF |
3263 DIFF_FORMAT_NO_OUTPUT))
3264 options->output_format &= ~(DIFF_FORMAT_RAW |
3265 DIFF_FORMAT_NUMSTAT |
3266 DIFF_FORMAT_DIFFSTAT |
3267 DIFF_FORMAT_SHORTSTAT |
3268 DIFF_FORMAT_DIRSTAT |
3269 DIFF_FORMAT_SUMMARY |
3270 DIFF_FORMAT_PATCH);
3271
3272 /*
3273 * These cases always need recursive; we do not drop caller-supplied
3274 * recursive bits for other formats here.
3275 */
3276 if (options->output_format & (DIFF_FORMAT_PATCH |
3277 DIFF_FORMAT_NUMSTAT |
3278 DIFF_FORMAT_DIFFSTAT |
3279 DIFF_FORMAT_SHORTSTAT |
3280 DIFF_FORMAT_DIRSTAT |
3281 DIFF_FORMAT_SUMMARY |
3282 DIFF_FORMAT_CHECKDIFF))
3283 DIFF_OPT_SET(options, RECURSIVE);
3284 /*
3285 * Also pickaxe would not work very well if you do not say recursive
3286 */
3287 if (options->pickaxe)
3288 DIFF_OPT_SET(options, RECURSIVE);
3289 /*
3290 * When patches are generated, submodules diffed against the work tree
3291 * must be checked for dirtiness too so it can be shown in the output
3292 */
3293 if (options->output_format & DIFF_FORMAT_PATCH)
3294 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3295
3296 if (options->detect_rename && options->rename_limit < 0)
3297 options->rename_limit = diff_rename_limit_default;
3298 if (options->setup & DIFF_SETUP_USE_CACHE) {
3299 if (!active_cache)
3300 /* read-cache does not die even when it fails
3301 * so it is safe for us to do this here. Also
3302 * it does not smudge active_cache or active_nr
3303 * when it fails, so we do not have to worry about
3304 * cleaning it up ourselves either.
3305 */
3306 read_cache();
3307 }
3308 if (options->abbrev <= 0 || 40 < options->abbrev)
3309 options->abbrev = 40; /* full */
3310
3311 /*
3312 * It does not make sense to show the first hit we happened
3313 * to have found. It does not make sense not to return with
3314 * exit code in such a case either.
3315 */
3316 if (DIFF_OPT_TST(options, QUICK)) {
3317 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3318 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3319 }
3320 }
3321
3322 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3323 {
3324 char c, *eq;
3325 int len;
3326
3327 if (*arg != '-')
3328 return 0;
3329 c = *++arg;
3330 if (!c)
3331 return 0;
3332 if (c == arg_short) {
3333 c = *++arg;
3334 if (!c)
3335 return 1;
3336 if (val && isdigit(c)) {
3337 char *end;
3338 int n = strtoul(arg, &end, 10);
3339 if (*end)
3340 return 0;
3341 *val = n;
3342 return 1;
3343 }
3344 return 0;
3345 }
3346 if (c != '-')
3347 return 0;
3348 arg++;
3349 eq = strchr(arg, '=');
3350 if (eq)
3351 len = eq - arg;
3352 else
3353 len = strlen(arg);
3354 if (!len || strncmp(arg, arg_long, len))
3355 return 0;
3356 if (eq) {
3357 int n;
3358 char *end;
3359 if (!isdigit(*++eq))
3360 return 0;
3361 n = strtoul(eq, &end, 10);
3362 if (*end)
3363 return 0;
3364 *val = n;
3365 }
3366 return 1;
3367 }
3368
3369 static int diff_scoreopt_parse(const char *opt);
3370
3371 static inline int short_opt(char opt, const char **argv,
3372 const char **optarg)
3373 {
3374 const char *arg = argv[0];
3375 if (arg[0] != '-' || arg[1] != opt)
3376 return 0;
3377 if (arg[2] != '\0') {
3378 *optarg = arg + 2;
3379 return 1;
3380 }
3381 if (!argv[1])
3382 die("Option '%c' requires a value", opt);
3383 *optarg = argv[1];
3384 return 2;
3385 }
3386
3387 int parse_long_opt(const char *opt, const char **argv,
3388 const char **optarg)
3389 {
3390 const char *arg = argv[0];
3391 if (arg[0] != '-' || arg[1] != '-')
3392 return 0;
3393 arg += strlen("--");
3394 if (prefixcmp(arg, opt))
3395 return 0;
3396 arg += strlen(opt);
3397 if (*arg == '=') { /* sticked form: --option=value */
3398 *optarg = arg + 1;
3399 return 1;
3400 }
3401 if (*arg != '\0')
3402 return 0;
3403 /* separate form: --option value */
3404 if (!argv[1])
3405 die("Option '--%s' requires a value", opt);
3406 *optarg = argv[1];
3407 return 2;
3408 }
3409
3410 static int stat_opt(struct diff_options *options, const char **av)
3411 {
3412 const char *arg = av[0];
3413 char *end;
3414 int width = options->stat_width;
3415 int name_width = options->stat_name_width;
3416 int graph_width = options->stat_graph_width;
3417 int count = options->stat_count;
3418 int argcount = 1;
3419
3420 arg += strlen("--stat");
3421 end = (char *)arg;
3422
3423 switch (*arg) {
3424 case '-':
3425 if (!prefixcmp(arg, "-width")) {
3426 arg += strlen("-width");
3427 if (*arg == '=')
3428 width = strtoul(arg + 1, &end, 10);
3429 else if (!*arg && !av[1])
3430 die("Option '--stat-width' requires a value");
3431 else if (!*arg) {
3432 width = strtoul(av[1], &end, 10);
3433 argcount = 2;
3434 }
3435 } else if (!prefixcmp(arg, "-name-width")) {
3436 arg += strlen("-name-width");
3437 if (*arg == '=')
3438 name_width = strtoul(arg + 1, &end, 10);
3439 else if (!*arg && !av[1])
3440 die("Option '--stat-name-width' requires a value");
3441 else if (!*arg) {
3442 name_width = strtoul(av[1], &end, 10);
3443 argcount = 2;
3444 }
3445 } else if (!prefixcmp(arg, "-graph-width")) {
3446 arg += strlen("-graph-width");
3447 if (*arg == '=')
3448 graph_width = strtoul(arg + 1, &end, 10);
3449 else if (!*arg && !av[1])
3450 die("Option '--stat-graph-width' requires a value");
3451 else if (!*arg) {
3452 graph_width = strtoul(av[1], &end, 10);
3453 argcount = 2;
3454 }
3455 } else if (!prefixcmp(arg, "-count")) {
3456 arg += strlen("-count");
3457 if (*arg == '=')
3458 count = strtoul(arg + 1, &end, 10);
3459 else if (!*arg && !av[1])
3460 die("Option '--stat-count' requires a value");
3461 else if (!*arg) {
3462 count = strtoul(av[1], &end, 10);
3463 argcount = 2;
3464 }
3465 }
3466 break;
3467 case '=':
3468 width = strtoul(arg+1, &end, 10);
3469 if (*end == ',')
3470 name_width = strtoul(end+1, &end, 10);
3471 if (*end == ',')
3472 count = strtoul(end+1, &end, 10);
3473 }
3474
3475 /* Important! This checks all the error cases! */
3476 if (*end)
3477 return 0;
3478 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3479 options->stat_name_width = name_width;
3480 options->stat_graph_width = graph_width;
3481 options->stat_width = width;
3482 options->stat_count = count;
3483 return argcount;
3484 }
3485
3486 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3487 {
3488 struct strbuf errmsg = STRBUF_INIT;
3489 if (parse_dirstat_params(options, params, &errmsg))
3490 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3491 errmsg.buf);
3492 strbuf_release(&errmsg);
3493 /*
3494 * The caller knows a dirstat-related option is given from the command
3495 * line; allow it to say "return this_function();"
3496 */
3497 options->output_format |= DIFF_FORMAT_DIRSTAT;
3498 return 1;
3499 }
3500
3501 static int parse_submodule_opt(struct diff_options *options, const char *value)
3502 {
3503 if (parse_submodule_params(options, value))
3504 die(_("Failed to parse --submodule option parameter: '%s'"),
3505 value);
3506 return 1;
3507 }
3508
3509 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3510 {
3511 const char *arg = av[0];
3512 const char *optarg;
3513 int argcount;
3514
3515 /* Output format options */
3516 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3517 options->output_format |= DIFF_FORMAT_PATCH;
3518 else if (opt_arg(arg, 'U', "unified", &options->context))
3519 options->output_format |= DIFF_FORMAT_PATCH;
3520 else if (!strcmp(arg, "--raw"))
3521 options->output_format |= DIFF_FORMAT_RAW;
3522 else if (!strcmp(arg, "--patch-with-raw"))
3523 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3524 else if (!strcmp(arg, "--numstat"))
3525 options->output_format |= DIFF_FORMAT_NUMSTAT;
3526 else if (!strcmp(arg, "--shortstat"))
3527 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3528 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3529 return parse_dirstat_opt(options, "");
3530 else if (!prefixcmp(arg, "-X"))
3531 return parse_dirstat_opt(options, arg + 2);
3532 else if (!prefixcmp(arg, "--dirstat="))
3533 return parse_dirstat_opt(options, arg + 10);
3534 else if (!strcmp(arg, "--cumulative"))
3535 return parse_dirstat_opt(options, "cumulative");
3536 else if (!strcmp(arg, "--dirstat-by-file"))
3537 return parse_dirstat_opt(options, "files");
3538 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3539 parse_dirstat_opt(options, "files");
3540 return parse_dirstat_opt(options, arg + 18);
3541 }
3542 else if (!strcmp(arg, "--check"))
3543 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3544 else if (!strcmp(arg, "--summary"))
3545 options->output_format |= DIFF_FORMAT_SUMMARY;
3546 else if (!strcmp(arg, "--patch-with-stat"))
3547 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3548 else if (!strcmp(arg, "--name-only"))
3549 options->output_format |= DIFF_FORMAT_NAME;
3550 else if (!strcmp(arg, "--name-status"))
3551 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3552 else if (!strcmp(arg, "-s"))
3553 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3554 else if (!prefixcmp(arg, "--stat"))
3555 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3556 return stat_opt(options, av);
3557
3558 /* renames options */
3559 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3560 !strcmp(arg, "--break-rewrites")) {
3561 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3562 return error("invalid argument to -B: %s", arg+2);
3563 }
3564 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3565 !strcmp(arg, "--find-renames")) {
3566 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3567 return error("invalid argument to -M: %s", arg+2);
3568 options->detect_rename = DIFF_DETECT_RENAME;
3569 }
3570 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3571 options->irreversible_delete = 1;
3572 }
3573 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3574 !strcmp(arg, "--find-copies")) {
3575 if (options->detect_rename == DIFF_DETECT_COPY)
3576 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3577 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3578 return error("invalid argument to -C: %s", arg+2);
3579 options->detect_rename = DIFF_DETECT_COPY;
3580 }
3581 else if (!strcmp(arg, "--no-renames"))
3582 options->detect_rename = 0;
3583 else if (!strcmp(arg, "--rename-empty"))
3584 DIFF_OPT_SET(options, RENAME_EMPTY);
3585 else if (!strcmp(arg, "--no-rename-empty"))
3586 DIFF_OPT_CLR(options, RENAME_EMPTY);
3587 else if (!strcmp(arg, "--relative"))
3588 DIFF_OPT_SET(options, RELATIVE_NAME);
3589 else if (!prefixcmp(arg, "--relative=")) {
3590 DIFF_OPT_SET(options, RELATIVE_NAME);
3591 options->prefix = arg + 11;
3592 }
3593
3594 /* xdiff options */
3595 else if (!strcmp(arg, "--minimal"))
3596 DIFF_XDL_SET(options, NEED_MINIMAL);
3597 else if (!strcmp(arg, "--no-minimal"))
3598 DIFF_XDL_CLR(options, NEED_MINIMAL);
3599 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3600 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3601 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3602 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3603 else if (!strcmp(arg, "--ignore-space-at-eol"))
3604 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3605 else if (!strcmp(arg, "--patience"))
3606 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3607 else if (!strcmp(arg, "--histogram"))
3608 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3609
3610 /* flags options */
3611 else if (!strcmp(arg, "--binary")) {
3612 options->output_format |= DIFF_FORMAT_PATCH;
3613 DIFF_OPT_SET(options, BINARY);
3614 }
3615 else if (!strcmp(arg, "--full-index"))
3616 DIFF_OPT_SET(options, FULL_INDEX);
3617 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3618 DIFF_OPT_SET(options, TEXT);
3619 else if (!strcmp(arg, "-R"))
3620 DIFF_OPT_SET(options, REVERSE_DIFF);
3621 else if (!strcmp(arg, "--find-copies-harder"))
3622 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3623 else if (!strcmp(arg, "--follow"))
3624 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3625 else if (!strcmp(arg, "--color"))
3626 options->use_color = 1;
3627 else if (!prefixcmp(arg, "--color=")) {
3628 int value = git_config_colorbool(NULL, arg+8);
3629 if (value < 0)
3630 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3631 options->use_color = value;
3632 }
3633 else if (!strcmp(arg, "--no-color"))
3634 options->use_color = 0;
3635 else if (!strcmp(arg, "--color-words")) {
3636 options->use_color = 1;
3637 options->word_diff = DIFF_WORDS_COLOR;
3638 }
3639 else if (!prefixcmp(arg, "--color-words=")) {
3640 options->use_color = 1;
3641 options->word_diff = DIFF_WORDS_COLOR;
3642 options->word_regex = arg + 14;
3643 }
3644 else if (!strcmp(arg, "--word-diff")) {
3645 if (options->word_diff == DIFF_WORDS_NONE)
3646 options->word_diff = DIFF_WORDS_PLAIN;
3647 }
3648 else if (!prefixcmp(arg, "--word-diff=")) {
3649 const char *type = arg + 12;
3650 if (!strcmp(type, "plain"))
3651 options->word_diff = DIFF_WORDS_PLAIN;
3652 else if (!strcmp(type, "color")) {
3653 options->use_color = 1;
3654 options->word_diff = DIFF_WORDS_COLOR;
3655 }
3656 else if (!strcmp(type, "porcelain"))
3657 options->word_diff = DIFF_WORDS_PORCELAIN;
3658 else if (!strcmp(type, "none"))
3659 options->word_diff = DIFF_WORDS_NONE;
3660 else
3661 die("bad --word-diff argument: %s", type);
3662 }
3663 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3664 if (options->word_diff == DIFF_WORDS_NONE)
3665 options->word_diff = DIFF_WORDS_PLAIN;
3666 options->word_regex = optarg;
3667 return argcount;
3668 }
3669 else if (!strcmp(arg, "--exit-code"))
3670 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3671 else if (!strcmp(arg, "--quiet"))
3672 DIFF_OPT_SET(options, QUICK);
3673 else if (!strcmp(arg, "--ext-diff"))
3674 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3675 else if (!strcmp(arg, "--no-ext-diff"))
3676 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3677 else if (!strcmp(arg, "--textconv"))
3678 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3679 else if (!strcmp(arg, "--no-textconv"))
3680 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3681 else if (!strcmp(arg, "--ignore-submodules")) {
3682 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3683 handle_ignore_submodules_arg(options, "all");
3684 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3685 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3686 handle_ignore_submodules_arg(options, arg + 20);
3687 } else if (!strcmp(arg, "--submodule"))
3688 DIFF_OPT_SET(options, SUBMODULE_LOG);
3689 else if (!prefixcmp(arg, "--submodule="))
3690 return parse_submodule_opt(options, arg + 12);
3691
3692 /* misc options */
3693 else if (!strcmp(arg, "-z"))
3694 options->line_termination = 0;
3695 else if ((argcount = short_opt('l', av, &optarg))) {
3696 options->rename_limit = strtoul(optarg, NULL, 10);
3697 return argcount;
3698 }
3699 else if ((argcount = short_opt('S', av, &optarg))) {
3700 options->pickaxe = optarg;
3701 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3702 return argcount;
3703 } else if ((argcount = short_opt('G', av, &optarg))) {
3704 options->pickaxe = optarg;
3705 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3706 return argcount;
3707 }
3708 else if (!strcmp(arg, "--pickaxe-all"))
3709 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3710 else if (!strcmp(arg, "--pickaxe-regex"))
3711 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3712 else if ((argcount = short_opt('O', av, &optarg))) {
3713 options->orderfile = optarg;
3714 return argcount;
3715 }
3716 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3717 options->filter = optarg;
3718 return argcount;
3719 }
3720 else if (!strcmp(arg, "--abbrev"))
3721 options->abbrev = DEFAULT_ABBREV;
3722 else if (!prefixcmp(arg, "--abbrev=")) {
3723 options->abbrev = strtoul(arg + 9, NULL, 10);
3724 if (options->abbrev < MINIMUM_ABBREV)
3725 options->abbrev = MINIMUM_ABBREV;
3726 else if (40 < options->abbrev)
3727 options->abbrev = 40;
3728 }
3729 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3730 options->a_prefix = optarg;
3731 return argcount;
3732 }
3733 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3734 options->b_prefix = optarg;
3735 return argcount;
3736 }
3737 else if (!strcmp(arg, "--no-prefix"))
3738 options->a_prefix = options->b_prefix = "";
3739 else if (opt_arg(arg, '\0', "inter-hunk-context",
3740 &options->interhunkcontext))
3741 ;
3742 else if (!strcmp(arg, "-W"))
3743 DIFF_OPT_SET(options, FUNCCONTEXT);
3744 else if (!strcmp(arg, "--function-context"))
3745 DIFF_OPT_SET(options, FUNCCONTEXT);
3746 else if (!strcmp(arg, "--no-function-context"))
3747 DIFF_OPT_CLR(options, FUNCCONTEXT);
3748 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3749 options->file = fopen(optarg, "w");
3750 if (!options->file)
3751 die_errno("Could not open '%s'", optarg);
3752 options->close_file = 1;
3753 return argcount;
3754 } else
3755 return 0;
3756 return 1;
3757 }
3758
3759 int parse_rename_score(const char **cp_p)
3760 {
3761 unsigned long num, scale;
3762 int ch, dot;
3763 const char *cp = *cp_p;
3764
3765 num = 0;
3766 scale = 1;
3767 dot = 0;
3768 for (;;) {
3769 ch = *cp;
3770 if ( !dot && ch == '.' ) {
3771 scale = 1;
3772 dot = 1;
3773 } else if ( ch == '%' ) {
3774 scale = dot ? scale*100 : 100;
3775 cp++; /* % is always at the end */
3776 break;
3777 } else if ( ch >= '0' && ch <= '9' ) {
3778 if ( scale < 100000 ) {
3779 scale *= 10;
3780 num = (num*10) + (ch-'0');
3781 }
3782 } else {
3783 break;
3784 }
3785 cp++;
3786 }
3787 *cp_p = cp;
3788
3789 /* user says num divided by scale and we say internally that
3790 * is MAX_SCORE * num / scale.
3791 */
3792 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3793 }
3794
3795 static int diff_scoreopt_parse(const char *opt)
3796 {
3797 int opt1, opt2, cmd;
3798
3799 if (*opt++ != '-')
3800 return -1;
3801 cmd = *opt++;
3802 if (cmd == '-') {
3803 /* convert the long-form arguments into short-form versions */
3804 if (!prefixcmp(opt, "break-rewrites")) {
3805 opt += strlen("break-rewrites");
3806 if (*opt == 0 || *opt++ == '=')
3807 cmd = 'B';
3808 } else if (!prefixcmp(opt, "find-copies")) {
3809 opt += strlen("find-copies");
3810 if (*opt == 0 || *opt++ == '=')
3811 cmd = 'C';
3812 } else if (!prefixcmp(opt, "find-renames")) {
3813 opt += strlen("find-renames");
3814 if (*opt == 0 || *opt++ == '=')
3815 cmd = 'M';
3816 }
3817 }
3818 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3819 return -1; /* that is not a -M, -C nor -B option */
3820
3821 opt1 = parse_rename_score(&opt);
3822 if (cmd != 'B')
3823 opt2 = 0;
3824 else {
3825 if (*opt == 0)
3826 opt2 = 0;
3827 else if (*opt != '/')
3828 return -1; /* we expect -B80/99 or -B80 */
3829 else {
3830 opt++;
3831 opt2 = parse_rename_score(&opt);
3832 }
3833 }
3834 if (*opt != 0)
3835 return -1;
3836 return opt1 | (opt2 << 16);
3837 }
3838
3839 struct diff_queue_struct diff_queued_diff;
3840
3841 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3842 {
3843 if (queue->alloc <= queue->nr) {
3844 queue->alloc = alloc_nr(queue->alloc);
3845 queue->queue = xrealloc(queue->queue,
3846 sizeof(dp) * queue->alloc);
3847 }
3848 queue->queue[queue->nr++] = dp;
3849 }
3850
3851 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3852 struct diff_filespec *one,
3853 struct diff_filespec *two)
3854 {
3855 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3856 dp->one = one;
3857 dp->two = two;
3858 if (queue)
3859 diff_q(queue, dp);
3860 return dp;
3861 }
3862
3863 void diff_free_filepair(struct diff_filepair *p)
3864 {
3865 free_filespec(p->one);
3866 free_filespec(p->two);
3867 free(p);
3868 }
3869
3870 /* This is different from find_unique_abbrev() in that
3871 * it stuffs the result with dots for alignment.
3872 */
3873 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3874 {
3875 int abblen;
3876 const char *abbrev;
3877 if (len == 40)
3878 return sha1_to_hex(sha1);
3879
3880 abbrev = find_unique_abbrev(sha1, len);
3881 abblen = strlen(abbrev);
3882 if (abblen < 37) {
3883 static char hex[41];
3884 if (len < abblen && abblen <= len + 2)
3885 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3886 else
3887 sprintf(hex, "%s...", abbrev);
3888 return hex;
3889 }
3890 return sha1_to_hex(sha1);
3891 }
3892
3893 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3894 {
3895 int line_termination = opt->line_termination;
3896 int inter_name_termination = line_termination ? '\t' : '\0';
3897 if (opt->output_prefix) {
3898 struct strbuf *msg = NULL;
3899 msg = opt->output_prefix(opt, opt->output_prefix_data);
3900 fprintf(opt->file, "%s", msg->buf);
3901 }
3902
3903 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3904 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3905 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3906 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3907 }
3908 if (p->score) {
3909 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3910 inter_name_termination);
3911 } else {
3912 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3913 }
3914
3915 if (p->status == DIFF_STATUS_COPIED ||
3916 p->status == DIFF_STATUS_RENAMED) {
3917 const char *name_a, *name_b;
3918 name_a = p->one->path;
3919 name_b = p->two->path;
3920 strip_prefix(opt->prefix_length, &name_a, &name_b);
3921 write_name_quoted(name_a, opt->file, inter_name_termination);
3922 write_name_quoted(name_b, opt->file, line_termination);
3923 } else {
3924 const char *name_a, *name_b;
3925 name_a = p->one->mode ? p->one->path : p->two->path;
3926 name_b = NULL;
3927 strip_prefix(opt->prefix_length, &name_a, &name_b);
3928 write_name_quoted(name_a, opt->file, line_termination);
3929 }
3930 }
3931
3932 int diff_unmodified_pair(struct diff_filepair *p)
3933 {
3934 /* This function is written stricter than necessary to support
3935 * the currently implemented transformers, but the idea is to
3936 * let transformers to produce diff_filepairs any way they want,
3937 * and filter and clean them up here before producing the output.
3938 */
3939 struct diff_filespec *one = p->one, *two = p->two;
3940
3941 if (DIFF_PAIR_UNMERGED(p))
3942 return 0; /* unmerged is interesting */
3943
3944 /* deletion, addition, mode or type change
3945 * and rename are all interesting.
3946 */
3947 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3948 DIFF_PAIR_MODE_CHANGED(p) ||
3949 strcmp(one->path, two->path))
3950 return 0;
3951
3952 /* both are valid and point at the same path. that is, we are
3953 * dealing with a change.
3954 */
3955 if (one->sha1_valid && two->sha1_valid &&
3956 !hashcmp(one->sha1, two->sha1) &&
3957 !one->dirty_submodule && !two->dirty_submodule)
3958 return 1; /* no change */
3959 if (!one->sha1_valid && !two->sha1_valid)
3960 return 1; /* both look at the same file on the filesystem. */
3961 return 0;
3962 }
3963
3964 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3965 {
3966 if (diff_unmodified_pair(p))
3967 return;
3968
3969 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3970 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3971 return; /* no tree diffs in patch format */
3972
3973 run_diff(p, o);
3974 }
3975
3976 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3977 struct diffstat_t *diffstat)
3978 {
3979 if (diff_unmodified_pair(p))
3980 return;
3981
3982 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3983 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3984 return; /* no useful stat for tree diffs */
3985
3986 run_diffstat(p, o, diffstat);
3987 }
3988
3989 static void diff_flush_checkdiff(struct diff_filepair *p,
3990 struct diff_options *o)
3991 {
3992 if (diff_unmodified_pair(p))
3993 return;
3994
3995 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3996 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3997 return; /* nothing to check in tree diffs */
3998
3999 run_checkdiff(p, o);
4000 }
4001
4002 int diff_queue_is_empty(void)
4003 {
4004 struct diff_queue_struct *q = &diff_queued_diff;
4005 int i;
4006 for (i = 0; i < q->nr; i++)
4007 if (!diff_unmodified_pair(q->queue[i]))
4008 return 0;
4009 return 1;
4010 }
4011
4012 #if DIFF_DEBUG
4013 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4014 {
4015 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4016 x, one ? one : "",
4017 s->path,
4018 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4019 s->mode,
4020 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4021 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
4022 x, one ? one : "",
4023 s->size, s->xfrm_flags);
4024 }
4025
4026 void diff_debug_filepair(const struct diff_filepair *p, int i)
4027 {
4028 diff_debug_filespec(p->one, i, "one");
4029 diff_debug_filespec(p->two, i, "two");
4030 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4031 p->score, p->status ? p->status : '?',
4032 p->one->rename_used, p->broken_pair);
4033 }
4034
4035 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4036 {
4037 int i;
4038 if (msg)
4039 fprintf(stderr, "%s\n", msg);
4040 fprintf(stderr, "q->nr = %d\n", q->nr);
4041 for (i = 0; i < q->nr; i++) {
4042 struct diff_filepair *p = q->queue[i];
4043 diff_debug_filepair(p, i);
4044 }
4045 }
4046 #endif
4047
4048 static void diff_resolve_rename_copy(void)
4049 {
4050 int i;
4051 struct diff_filepair *p;
4052 struct diff_queue_struct *q = &diff_queued_diff;
4053
4054 diff_debug_queue("resolve-rename-copy", q);
4055
4056 for (i = 0; i < q->nr; i++) {
4057 p = q->queue[i];
4058 p->status = 0; /* undecided */
4059 if (DIFF_PAIR_UNMERGED(p))
4060 p->status = DIFF_STATUS_UNMERGED;
4061 else if (!DIFF_FILE_VALID(p->one))
4062 p->status = DIFF_STATUS_ADDED;
4063 else if (!DIFF_FILE_VALID(p->two))
4064 p->status = DIFF_STATUS_DELETED;
4065 else if (DIFF_PAIR_TYPE_CHANGED(p))
4066 p->status = DIFF_STATUS_TYPE_CHANGED;
4067
4068 /* from this point on, we are dealing with a pair
4069 * whose both sides are valid and of the same type, i.e.
4070 * either in-place edit or rename/copy edit.
4071 */
4072 else if (DIFF_PAIR_RENAME(p)) {
4073 /*
4074 * A rename might have re-connected a broken
4075 * pair up, causing the pathnames to be the
4076 * same again. If so, that's not a rename at
4077 * all, just a modification..
4078 *
4079 * Otherwise, see if this source was used for
4080 * multiple renames, in which case we decrement
4081 * the count, and call it a copy.
4082 */
4083 if (!strcmp(p->one->path, p->two->path))
4084 p->status = DIFF_STATUS_MODIFIED;
4085 else if (--p->one->rename_used > 0)
4086 p->status = DIFF_STATUS_COPIED;
4087 else
4088 p->status = DIFF_STATUS_RENAMED;
4089 }
4090 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4091 p->one->mode != p->two->mode ||
4092 p->one->dirty_submodule ||
4093 p->two->dirty_submodule ||
4094 is_null_sha1(p->one->sha1))
4095 p->status = DIFF_STATUS_MODIFIED;
4096 else {
4097 /* This is a "no-change" entry and should not
4098 * happen anymore, but prepare for broken callers.
4099 */
4100 error("feeding unmodified %s to diffcore",
4101 p->one->path);
4102 p->status = DIFF_STATUS_UNKNOWN;
4103 }
4104 }
4105 diff_debug_queue("resolve-rename-copy done", q);
4106 }
4107
4108 static int check_pair_status(struct diff_filepair *p)
4109 {
4110 switch (p->status) {
4111 case DIFF_STATUS_UNKNOWN:
4112 return 0;
4113 case 0:
4114 die("internal error in diff-resolve-rename-copy");
4115 default:
4116 return 1;
4117 }
4118 }
4119
4120 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4121 {
4122 int fmt = opt->output_format;
4123
4124 if (fmt & DIFF_FORMAT_CHECKDIFF)
4125 diff_flush_checkdiff(p, opt);
4126 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4127 diff_flush_raw(p, opt);
4128 else if (fmt & DIFF_FORMAT_NAME) {
4129 const char *name_a, *name_b;
4130 name_a = p->two->path;
4131 name_b = NULL;
4132 strip_prefix(opt->prefix_length, &name_a, &name_b);
4133 write_name_quoted(name_a, opt->file, opt->line_termination);
4134 }
4135 }
4136
4137 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4138 {
4139 if (fs->mode)
4140 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4141 else
4142 fprintf(file, " %s ", newdelete);
4143 write_name_quoted(fs->path, file, '\n');
4144 }
4145
4146
4147 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4148 const char *line_prefix)
4149 {
4150 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4151 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4152 p->two->mode, show_name ? ' ' : '\n');
4153 if (show_name) {
4154 write_name_quoted(p->two->path, file, '\n');
4155 }
4156 }
4157 }
4158
4159 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4160 const char *line_prefix)
4161 {
4162 char *names = pprint_rename(p->one->path, p->two->path);
4163
4164 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4165 free(names);
4166 show_mode_change(file, p, 0, line_prefix);
4167 }
4168
4169 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4170 {
4171 FILE *file = opt->file;
4172 char *line_prefix = "";
4173
4174 if (opt->output_prefix) {
4175 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4176 line_prefix = buf->buf;
4177 }
4178
4179 switch(p->status) {
4180 case DIFF_STATUS_DELETED:
4181 fputs(line_prefix, file);
4182 show_file_mode_name(file, "delete", p->one);
4183 break;
4184 case DIFF_STATUS_ADDED:
4185 fputs(line_prefix, file);
4186 show_file_mode_name(file, "create", p->two);
4187 break;
4188 case DIFF_STATUS_COPIED:
4189 fputs(line_prefix, file);
4190 show_rename_copy(file, "copy", p, line_prefix);
4191 break;
4192 case DIFF_STATUS_RENAMED:
4193 fputs(line_prefix, file);
4194 show_rename_copy(file, "rename", p, line_prefix);
4195 break;
4196 default:
4197 if (p->score) {
4198 fprintf(file, "%s rewrite ", line_prefix);
4199 write_name_quoted(p->two->path, file, ' ');
4200 fprintf(file, "(%d%%)\n", similarity_index(p));
4201 }
4202 show_mode_change(file, p, !p->score, line_prefix);
4203 break;
4204 }
4205 }
4206
4207 struct patch_id_t {
4208 git_SHA_CTX *ctx;
4209 int patchlen;
4210 };
4211
4212 static int remove_space(char *line, int len)
4213 {
4214 int i;
4215 char *dst = line;
4216 unsigned char c;
4217
4218 for (i = 0; i < len; i++)
4219 if (!isspace((c = line[i])))
4220 *dst++ = c;
4221
4222 return dst - line;
4223 }
4224
4225 static void patch_id_consume(void *priv, char *line, unsigned long len)
4226 {
4227 struct patch_id_t *data = priv;
4228 int new_len;
4229
4230 /* Ignore line numbers when computing the SHA1 of the patch */
4231 if (!prefixcmp(line, "@@ -"))
4232 return;
4233
4234 new_len = remove_space(line, len);
4235
4236 git_SHA1_Update(data->ctx, line, new_len);
4237 data->patchlen += new_len;
4238 }
4239
4240 /* returns 0 upon success, and writes result into sha1 */
4241 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4242 {
4243 struct diff_queue_struct *q = &diff_queued_diff;
4244 int i;
4245 git_SHA_CTX ctx;
4246 struct patch_id_t data;
4247 char buffer[PATH_MAX * 4 + 20];
4248
4249 git_SHA1_Init(&ctx);
4250 memset(&data, 0, sizeof(struct patch_id_t));
4251 data.ctx = &ctx;
4252
4253 for (i = 0; i < q->nr; i++) {
4254 xpparam_t xpp;
4255 xdemitconf_t xecfg;
4256 mmfile_t mf1, mf2;
4257 struct diff_filepair *p = q->queue[i];
4258 int len1, len2;
4259
4260 memset(&xpp, 0, sizeof(xpp));
4261 memset(&xecfg, 0, sizeof(xecfg));
4262 if (p->status == 0)
4263 return error("internal diff status error");
4264 if (p->status == DIFF_STATUS_UNKNOWN)
4265 continue;
4266 if (diff_unmodified_pair(p))
4267 continue;
4268 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4269 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4270 continue;
4271 if (DIFF_PAIR_UNMERGED(p))
4272 continue;
4273
4274 diff_fill_sha1_info(p->one);
4275 diff_fill_sha1_info(p->two);
4276 if (fill_mmfile(&mf1, p->one) < 0 ||
4277 fill_mmfile(&mf2, p->two) < 0)
4278 return error("unable to read files to diff");
4279
4280 len1 = remove_space(p->one->path, strlen(p->one->path));
4281 len2 = remove_space(p->two->path, strlen(p->two->path));
4282 if (p->one->mode == 0)
4283 len1 = snprintf(buffer, sizeof(buffer),
4284 "diff--gita/%.*sb/%.*s"
4285 "newfilemode%06o"
4286 "---/dev/null"
4287 "+++b/%.*s",
4288 len1, p->one->path,
4289 len2, p->two->path,
4290 p->two->mode,
4291 len2, p->two->path);
4292 else if (p->two->mode == 0)
4293 len1 = snprintf(buffer, sizeof(buffer),
4294 "diff--gita/%.*sb/%.*s"
4295 "deletedfilemode%06o"
4296 "---a/%.*s"
4297 "+++/dev/null",
4298 len1, p->one->path,
4299 len2, p->two->path,
4300 p->one->mode,
4301 len1, p->one->path);
4302 else
4303 len1 = snprintf(buffer, sizeof(buffer),
4304 "diff--gita/%.*sb/%.*s"
4305 "---a/%.*s"
4306 "+++b/%.*s",
4307 len1, p->one->path,
4308 len2, p->two->path,
4309 len1, p->one->path,
4310 len2, p->two->path);
4311 git_SHA1_Update(&ctx, buffer, len1);
4312
4313 if (diff_filespec_is_binary(p->one) ||
4314 diff_filespec_is_binary(p->two)) {
4315 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4316 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4317 continue;
4318 }
4319
4320 xpp.flags = 0;
4321 xecfg.ctxlen = 3;
4322 xecfg.flags = 0;
4323 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4324 &xpp, &xecfg);
4325 }
4326
4327 git_SHA1_Final(sha1, &ctx);
4328 return 0;
4329 }
4330
4331 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4332 {
4333 struct diff_queue_struct *q = &diff_queued_diff;
4334 int i;
4335 int result = diff_get_patch_id(options, sha1);
4336
4337 for (i = 0; i < q->nr; i++)
4338 diff_free_filepair(q->queue[i]);
4339
4340 free(q->queue);
4341 DIFF_QUEUE_CLEAR(q);
4342
4343 return result;
4344 }
4345
4346 static int is_summary_empty(const struct diff_queue_struct *q)
4347 {
4348 int i;
4349
4350 for (i = 0; i < q->nr; i++) {
4351 const struct diff_filepair *p = q->queue[i];
4352
4353 switch (p->status) {
4354 case DIFF_STATUS_DELETED:
4355 case DIFF_STATUS_ADDED:
4356 case DIFF_STATUS_COPIED:
4357 case DIFF_STATUS_RENAMED:
4358 return 0;
4359 default:
4360 if (p->score)
4361 return 0;
4362 if (p->one->mode && p->two->mode &&
4363 p->one->mode != p->two->mode)
4364 return 0;
4365 break;
4366 }
4367 }
4368 return 1;
4369 }
4370
4371 static const char rename_limit_warning[] =
4372 "inexact rename detection was skipped due to too many files.";
4373
4374 static const char degrade_cc_to_c_warning[] =
4375 "only found copies from modified paths due to too many files.";
4376
4377 static const char rename_limit_advice[] =
4378 "you may want to set your %s variable to at least "
4379 "%d and retry the command.";
4380
4381 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4382 {
4383 if (degraded_cc)
4384 warning(degrade_cc_to_c_warning);
4385 else if (needed)
4386 warning(rename_limit_warning);
4387 else
4388 return;
4389 if (0 < needed && needed < 32767)
4390 warning(rename_limit_advice, varname, needed);
4391 }
4392
4393 void diff_flush(struct diff_options *options)
4394 {
4395 struct diff_queue_struct *q = &diff_queued_diff;
4396 int i, output_format = options->output_format;
4397 int separator = 0;
4398 int dirstat_by_line = 0;
4399
4400 /*
4401 * Order: raw, stat, summary, patch
4402 * or: name/name-status/checkdiff (other bits clear)
4403 */
4404 if (!q->nr)
4405 goto free_queue;
4406
4407 if (output_format & (DIFF_FORMAT_RAW |
4408 DIFF_FORMAT_NAME |
4409 DIFF_FORMAT_NAME_STATUS |
4410 DIFF_FORMAT_CHECKDIFF)) {
4411 for (i = 0; i < q->nr; i++) {
4412 struct diff_filepair *p = q->queue[i];
4413 if (check_pair_status(p))
4414 flush_one_pair(p, options);
4415 }
4416 separator++;
4417 }
4418
4419 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4420 dirstat_by_line = 1;
4421
4422 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4423 dirstat_by_line) {
4424 struct diffstat_t diffstat;
4425
4426 memset(&diffstat, 0, sizeof(struct diffstat_t));
4427 for (i = 0; i < q->nr; i++) {
4428 struct diff_filepair *p = q->queue[i];
4429 if (check_pair_status(p))
4430 diff_flush_stat(p, options, &diffstat);
4431 }
4432 if (output_format & DIFF_FORMAT_NUMSTAT)
4433 show_numstat(&diffstat, options);
4434 if (output_format & DIFF_FORMAT_DIFFSTAT)
4435 show_stats(&diffstat, options);
4436 if (output_format & DIFF_FORMAT_SHORTSTAT)
4437 show_shortstats(&diffstat, options);
4438 if (output_format & DIFF_FORMAT_DIRSTAT)
4439 show_dirstat_by_line(&diffstat, options);
4440 free_diffstat_info(&diffstat);
4441 separator++;
4442 }
4443 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4444 show_dirstat(options);
4445
4446 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4447 for (i = 0; i < q->nr; i++) {
4448 diff_summary(options, q->queue[i]);
4449 }
4450 separator++;
4451 }
4452
4453 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4454 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4455 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4456 /*
4457 * run diff_flush_patch for the exit status. setting
4458 * options->file to /dev/null should be safe, becaue we
4459 * aren't supposed to produce any output anyway.
4460 */
4461 if (options->close_file)
4462 fclose(options->file);
4463 options->file = fopen("/dev/null", "w");
4464 if (!options->file)
4465 die_errno("Could not open /dev/null");
4466 options->close_file = 1;
4467 for (i = 0; i < q->nr; i++) {
4468 struct diff_filepair *p = q->queue[i];
4469 if (check_pair_status(p))
4470 diff_flush_patch(p, options);
4471 if (options->found_changes)
4472 break;
4473 }
4474 }
4475
4476 if (output_format & DIFF_FORMAT_PATCH) {
4477 if (separator) {
4478 if (options->output_prefix) {
4479 struct strbuf *msg = NULL;
4480 msg = options->output_prefix(options,
4481 options->output_prefix_data);
4482 fwrite(msg->buf, msg->len, 1, stdout);
4483 }
4484 putc(options->line_termination, options->file);
4485 if (options->stat_sep) {
4486 /* attach patch instead of inline */
4487 fputs(options->stat_sep, options->file);
4488 }
4489 }
4490
4491 for (i = 0; i < q->nr; i++) {
4492 struct diff_filepair *p = q->queue[i];
4493 if (check_pair_status(p))
4494 diff_flush_patch(p, options);
4495 }
4496 }
4497
4498 if (output_format & DIFF_FORMAT_CALLBACK)
4499 options->format_callback(q, options, options->format_callback_data);
4500
4501 for (i = 0; i < q->nr; i++)
4502 diff_free_filepair(q->queue[i]);
4503 free_queue:
4504 free(q->queue);
4505 DIFF_QUEUE_CLEAR(q);
4506 if (options->close_file)
4507 fclose(options->file);
4508
4509 /*
4510 * Report the content-level differences with HAS_CHANGES;
4511 * diff_addremove/diff_change does not set the bit when
4512 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4513 */
4514 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4515 if (options->found_changes)
4516 DIFF_OPT_SET(options, HAS_CHANGES);
4517 else
4518 DIFF_OPT_CLR(options, HAS_CHANGES);
4519 }
4520 }
4521
4522 static void diffcore_apply_filter(const char *filter)
4523 {
4524 int i;
4525 struct diff_queue_struct *q = &diff_queued_diff;
4526 struct diff_queue_struct outq;
4527 DIFF_QUEUE_CLEAR(&outq);
4528
4529 if (!filter)
4530 return;
4531
4532 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4533 int found;
4534 for (i = found = 0; !found && i < q->nr; i++) {
4535 struct diff_filepair *p = q->queue[i];
4536 if (((p->status == DIFF_STATUS_MODIFIED) &&
4537 ((p->score &&
4538 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4539 (!p->score &&
4540 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4541 ((p->status != DIFF_STATUS_MODIFIED) &&
4542 strchr(filter, p->status)))
4543 found++;
4544 }
4545 if (found)
4546 return;
4547
4548 /* otherwise we will clear the whole queue
4549 * by copying the empty outq at the end of this
4550 * function, but first clear the current entries
4551 * in the queue.
4552 */
4553 for (i = 0; i < q->nr; i++)
4554 diff_free_filepair(q->queue[i]);
4555 }
4556 else {
4557 /* Only the matching ones */
4558 for (i = 0; i < q->nr; i++) {
4559 struct diff_filepair *p = q->queue[i];
4560
4561 if (((p->status == DIFF_STATUS_MODIFIED) &&
4562 ((p->score &&
4563 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4564 (!p->score &&
4565 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4566 ((p->status != DIFF_STATUS_MODIFIED) &&
4567 strchr(filter, p->status)))
4568 diff_q(&outq, p);
4569 else
4570 diff_free_filepair(p);
4571 }
4572 }
4573 free(q->queue);
4574 *q = outq;
4575 }
4576
4577 /* Check whether two filespecs with the same mode and size are identical */
4578 static int diff_filespec_is_identical(struct diff_filespec *one,
4579 struct diff_filespec *two)
4580 {
4581 if (S_ISGITLINK(one->mode))
4582 return 0;
4583 if (diff_populate_filespec(one, 0))
4584 return 0;
4585 if (diff_populate_filespec(two, 0))
4586 return 0;
4587 return !memcmp(one->data, two->data, one->size);
4588 }
4589
4590 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4591 {
4592 int i;
4593 struct diff_queue_struct *q = &diff_queued_diff;
4594 struct diff_queue_struct outq;
4595 DIFF_QUEUE_CLEAR(&outq);
4596
4597 for (i = 0; i < q->nr; i++) {
4598 struct diff_filepair *p = q->queue[i];
4599
4600 /*
4601 * 1. Entries that come from stat info dirtiness
4602 * always have both sides (iow, not create/delete),
4603 * one side of the object name is unknown, with
4604 * the same mode and size. Keep the ones that
4605 * do not match these criteria. They have real
4606 * differences.
4607 *
4608 * 2. At this point, the file is known to be modified,
4609 * with the same mode and size, and the object
4610 * name of one side is unknown. Need to inspect
4611 * the identical contents.
4612 */
4613 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4614 !DIFF_FILE_VALID(p->two) ||
4615 (p->one->sha1_valid && p->two->sha1_valid) ||
4616 (p->one->mode != p->two->mode) ||
4617 diff_populate_filespec(p->one, 1) ||
4618 diff_populate_filespec(p->two, 1) ||
4619 (p->one->size != p->two->size) ||
4620 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4621 diff_q(&outq, p);
4622 else {
4623 /*
4624 * The caller can subtract 1 from skip_stat_unmatch
4625 * to determine how many paths were dirty only
4626 * due to stat info mismatch.
4627 */
4628 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4629 diffopt->skip_stat_unmatch++;
4630 diff_free_filepair(p);
4631 }
4632 }
4633 free(q->queue);
4634 *q = outq;
4635 }
4636
4637 static int diffnamecmp(const void *a_, const void *b_)
4638 {
4639 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4640 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4641 const char *name_a, *name_b;
4642
4643 name_a = a->one ? a->one->path : a->two->path;
4644 name_b = b->one ? b->one->path : b->two->path;
4645 return strcmp(name_a, name_b);
4646 }
4647
4648 void diffcore_fix_diff_index(struct diff_options *options)
4649 {
4650 struct diff_queue_struct *q = &diff_queued_diff;
4651 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4652 }
4653
4654 void diffcore_std(struct diff_options *options)
4655 {
4656 if (options->skip_stat_unmatch)
4657 diffcore_skip_stat_unmatch(options);
4658 if (!options->found_follow) {
4659 /* See try_to_follow_renames() in tree-diff.c */
4660 if (options->break_opt != -1)
4661 diffcore_break(options->break_opt);
4662 if (options->detect_rename)
4663 diffcore_rename(options);
4664 if (options->break_opt != -1)
4665 diffcore_merge_broken();
4666 }
4667 if (options->pickaxe)
4668 diffcore_pickaxe(options);
4669 if (options->orderfile)
4670 diffcore_order(options->orderfile);
4671 if (!options->found_follow)
4672 /* See try_to_follow_renames() in tree-diff.c */
4673 diff_resolve_rename_copy();
4674 diffcore_apply_filter(options->filter);
4675
4676 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4677 DIFF_OPT_SET(options, HAS_CHANGES);
4678 else
4679 DIFF_OPT_CLR(options, HAS_CHANGES);
4680
4681 options->found_follow = 0;
4682 }
4683
4684 int diff_result_code(struct diff_options *opt, int status)
4685 {
4686 int result = 0;
4687
4688 diff_warn_rename_limit("diff.renamelimit",
4689 opt->needed_rename_limit,
4690 opt->degraded_cc_to_c);
4691 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4692 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4693 return status;
4694 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4695 DIFF_OPT_TST(opt, HAS_CHANGES))
4696 result |= 01;
4697 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4698 DIFF_OPT_TST(opt, CHECK_FAILED))
4699 result |= 02;
4700 return result;
4701 }
4702
4703 int diff_can_quit_early(struct diff_options *opt)
4704 {
4705 return (DIFF_OPT_TST(opt, QUICK) &&
4706 !opt->filter &&
4707 DIFF_OPT_TST(opt, HAS_CHANGES));
4708 }
4709
4710 /*
4711 * Shall changes to this submodule be ignored?
4712 *
4713 * Submodule changes can be configured to be ignored separately for each path,
4714 * but that configuration can be overridden from the command line.
4715 */
4716 static int is_submodule_ignored(const char *path, struct diff_options *options)
4717 {
4718 int ignored = 0;
4719 unsigned orig_flags = options->flags;
4720 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4721 set_diffopt_flags_from_submodule_config(options, path);
4722 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4723 ignored = 1;
4724 options->flags = orig_flags;
4725 return ignored;
4726 }
4727
4728 void diff_addremove(struct diff_options *options,
4729 int addremove, unsigned mode,
4730 const unsigned char *sha1,
4731 int sha1_valid,
4732 const char *concatpath, unsigned dirty_submodule)
4733 {
4734 struct diff_filespec *one, *two;
4735
4736 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4737 return;
4738
4739 /* This may look odd, but it is a preparation for
4740 * feeding "there are unchanged files which should
4741 * not produce diffs, but when you are doing copy
4742 * detection you would need them, so here they are"
4743 * entries to the diff-core. They will be prefixed
4744 * with something like '=' or '*' (I haven't decided
4745 * which but should not make any difference).
4746 * Feeding the same new and old to diff_change()
4747 * also has the same effect.
4748 * Before the final output happens, they are pruned after
4749 * merged into rename/copy pairs as appropriate.
4750 */
4751 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4752 addremove = (addremove == '+' ? '-' :
4753 addremove == '-' ? '+' : addremove);
4754
4755 if (options->prefix &&
4756 strncmp(concatpath, options->prefix, options->prefix_length))
4757 return;
4758
4759 one = alloc_filespec(concatpath);
4760 two = alloc_filespec(concatpath);
4761
4762 if (addremove != '+')
4763 fill_filespec(one, sha1, sha1_valid, mode);
4764 if (addremove != '-') {
4765 fill_filespec(two, sha1, sha1_valid, mode);
4766 two->dirty_submodule = dirty_submodule;
4767 }
4768
4769 diff_queue(&diff_queued_diff, one, two);
4770 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4771 DIFF_OPT_SET(options, HAS_CHANGES);
4772 }
4773
4774 void diff_change(struct diff_options *options,
4775 unsigned old_mode, unsigned new_mode,
4776 const unsigned char *old_sha1,
4777 const unsigned char *new_sha1,
4778 int old_sha1_valid, int new_sha1_valid,
4779 const char *concatpath,
4780 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4781 {
4782 struct diff_filespec *one, *two;
4783
4784 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4785 is_submodule_ignored(concatpath, options))
4786 return;
4787
4788 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4789 unsigned tmp;
4790 const unsigned char *tmp_c;
4791 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4792 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4793 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4794 new_sha1_valid = tmp;
4795 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4796 new_dirty_submodule = tmp;
4797 }
4798
4799 if (options->prefix &&
4800 strncmp(concatpath, options->prefix, options->prefix_length))
4801 return;
4802
4803 one = alloc_filespec(concatpath);
4804 two = alloc_filespec(concatpath);
4805 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4806 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4807 one->dirty_submodule = old_dirty_submodule;
4808 two->dirty_submodule = new_dirty_submodule;
4809
4810 diff_queue(&diff_queued_diff, one, two);
4811 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4812 DIFF_OPT_SET(options, HAS_CHANGES);
4813 }
4814
4815 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4816 {
4817 struct diff_filepair *pair;
4818 struct diff_filespec *one, *two;
4819
4820 if (options->prefix &&
4821 strncmp(path, options->prefix, options->prefix_length))
4822 return NULL;
4823
4824 one = alloc_filespec(path);
4825 two = alloc_filespec(path);
4826 pair = diff_queue(&diff_queued_diff, one, two);
4827 pair->is_unmerged = 1;
4828 return pair;
4829 }
4830
4831 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4832 size_t *outsize)
4833 {
4834 struct diff_tempfile *temp;
4835 const char *argv[3];
4836 const char **arg = argv;
4837 struct child_process child;
4838 struct strbuf buf = STRBUF_INIT;
4839 int err = 0;
4840
4841 temp = prepare_temp_file(spec->path, spec);
4842 *arg++ = pgm;
4843 *arg++ = temp->name;
4844 *arg = NULL;
4845
4846 memset(&child, 0, sizeof(child));
4847 child.use_shell = 1;
4848 child.argv = argv;
4849 child.out = -1;
4850 if (start_command(&child)) {
4851 remove_tempfile();
4852 return NULL;
4853 }
4854
4855 if (strbuf_read(&buf, child.out, 0) < 0)
4856 err = error("error reading from textconv command '%s'", pgm);
4857 close(child.out);
4858
4859 if (finish_command(&child) || err) {
4860 strbuf_release(&buf);
4861 remove_tempfile();
4862 return NULL;
4863 }
4864 remove_tempfile();
4865
4866 return strbuf_detach(&buf, outsize);
4867 }
4868
4869 size_t fill_textconv(struct userdiff_driver *driver,
4870 struct diff_filespec *df,
4871 char **outbuf)
4872 {
4873 size_t size;
4874
4875 if (!driver || !driver->textconv) {
4876 if (!DIFF_FILE_VALID(df)) {
4877 *outbuf = "";
4878 return 0;
4879 }
4880 if (diff_populate_filespec(df, 0))
4881 die("unable to read files to diff");
4882 *outbuf = df->data;
4883 return df->size;
4884 }
4885
4886 if (driver->textconv_cache && df->sha1_valid) {
4887 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4888 &size);
4889 if (*outbuf)
4890 return size;
4891 }
4892
4893 *outbuf = run_textconv(driver->textconv, df, &size);
4894 if (!*outbuf)
4895 die("unable to read files to diff");
4896
4897 if (driver->textconv_cache && df->sha1_valid) {
4898 /* ignore errors, as we might be in a readonly repository */
4899 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4900 size);
4901 /*
4902 * we could save up changes and flush them all at the end,
4903 * but we would need an extra call after all diffing is done.
4904 * Since generating a cache entry is the slow path anyway,
4905 * this extra overhead probably isn't a big deal.
4906 */
4907 notes_cache_write(driver->textconv_cache);
4908 }
4909
4910 return size;
4911 }
4912
4913 void setup_diff_pager(struct diff_options *opt)
4914 {
4915 /*
4916 * If the user asked for our exit code, then either they want --quiet
4917 * or --exit-code. We should definitely not bother with a pager in the
4918 * former case, as we will generate no output. Since we still properly
4919 * report our exit code even when a pager is run, we _could_ run a
4920 * pager with --exit-code. But since we have not done so historically,
4921 * and because it is easy to find people oneline advising "git diff
4922 * --exit-code" in hooks and other scripts, we do not do so.
4923 */
4924 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4925 check_pager_config("diff") != 0)
4926 setup_pager();
4927 }
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