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Sync with 1.7.9.1
[git.git] / diff.c
blob84780fd5e641d9f1042f82863d1290f7ad8d92b5
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
19 #ifdef NO_FAST_WORKING_DIRECTORY
20 #define FAST_WORKING_DIRECTORY 0
21 #else
22 #define FAST_WORKING_DIRECTORY 1
23 #endif
24
25 static int diff_detect_rename_default;
26 static int diff_rename_limit_default = 400;
27 static int diff_suppress_blank_empty;
28 int diff_use_color_default = -1;
29 static const char *diff_word_regex_cfg;
30 static const char *external_diff_cmd_cfg;
31 int diff_auto_refresh_index = 1;
32 static int diff_mnemonic_prefix;
33 static int diff_no_prefix;
34 static int diff_dirstat_permille_default = 30;
35 static struct diff_options default_diff_options;
36
37 static char diff_colors[][COLOR_MAXLEN] = {
38 GIT_COLOR_RESET,
39 GIT_COLOR_NORMAL, /* PLAIN */
40 GIT_COLOR_BOLD, /* METAINFO */
41 GIT_COLOR_CYAN, /* FRAGINFO */
42 GIT_COLOR_RED, /* OLD */
43 GIT_COLOR_GREEN, /* NEW */
44 GIT_COLOR_YELLOW, /* COMMIT */
45 GIT_COLOR_BG_RED, /* WHITESPACE */
46 GIT_COLOR_NORMAL, /* FUNCINFO */
47 };
48
49 static int parse_diff_color_slot(const char *var, int ofs)
50 {
51 if (!strcasecmp(var+ofs, "plain"))
52 return DIFF_PLAIN;
53 if (!strcasecmp(var+ofs, "meta"))
54 return DIFF_METAINFO;
55 if (!strcasecmp(var+ofs, "frag"))
56 return DIFF_FRAGINFO;
57 if (!strcasecmp(var+ofs, "old"))
58 return DIFF_FILE_OLD;
59 if (!strcasecmp(var+ofs, "new"))
60 return DIFF_FILE_NEW;
61 if (!strcasecmp(var+ofs, "commit"))
62 return DIFF_COMMIT;
63 if (!strcasecmp(var+ofs, "whitespace"))
64 return DIFF_WHITESPACE;
65 if (!strcasecmp(var+ofs, "func"))
66 return DIFF_FUNCINFO;
67 return -1;
68 }
69
70 static int parse_dirstat_params(struct diff_options *options, const char *params,
71 struct strbuf *errmsg)
72 {
73 const char *p = params;
74 int p_len, ret = 0;
75
76 while (*p) {
77 p_len = strchrnul(p, ',') - p;
78 if (!memcmp(p, "changes", p_len)) {
79 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
80 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
81 } else if (!memcmp(p, "lines", p_len)) {
82 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
83 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
84 } else if (!memcmp(p, "files", p_len)) {
85 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
86 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
87 } else if (!memcmp(p, "noncumulative", p_len)) {
88 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
89 } else if (!memcmp(p, "cumulative", p_len)) {
90 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
91 } else if (isdigit(*p)) {
92 char *end;
93 int permille = strtoul(p, &end, 10) * 10;
94 if (*end == '.' && isdigit(*++end)) {
95 /* only use first digit */
96 permille += *end - '0';
97 /* .. and ignore any further digits */
98 while (isdigit(*++end))
99 ; /* nothing */
100 }
101 if (end - p == p_len)
102 options->dirstat_permille = permille;
103 else {
104 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%.*s'\n"),
105 p_len, p);
106 ret++;
107 }
108 } else {
109 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%.*s'\n"),
110 p_len, p);
111 ret++;
112 }
113
114 p += p_len;
115
116 if (*p)
117 p++; /* more parameters, swallow separator */
118 }
119 return ret;
120 }
121
122 static int git_config_rename(const char *var, const char *value)
123 {
124 if (!value)
125 return DIFF_DETECT_RENAME;
126 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
127 return DIFF_DETECT_COPY;
128 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
129 }
130
131 /*
132 * These are to give UI layer defaults.
133 * The core-level commands such as git-diff-files should
134 * never be affected by the setting of diff.renames
135 * the user happens to have in the configuration file.
136 */
137 int git_diff_ui_config(const char *var, const char *value, void *cb)
138 {
139 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
140 diff_use_color_default = git_config_colorbool(var, value);
141 return 0;
142 }
143 if (!strcmp(var, "diff.renames")) {
144 diff_detect_rename_default = git_config_rename(var, value);
145 return 0;
146 }
147 if (!strcmp(var, "diff.autorefreshindex")) {
148 diff_auto_refresh_index = git_config_bool(var, value);
149 return 0;
150 }
151 if (!strcmp(var, "diff.mnemonicprefix")) {
152 diff_mnemonic_prefix = git_config_bool(var, value);
153 return 0;
154 }
155 if (!strcmp(var, "diff.noprefix")) {
156 diff_no_prefix = git_config_bool(var, value);
157 return 0;
158 }
159 if (!strcmp(var, "diff.external"))
160 return git_config_string(&external_diff_cmd_cfg, var, value);
161 if (!strcmp(var, "diff.wordregex"))
162 return git_config_string(&diff_word_regex_cfg, var, value);
163
164 if (!strcmp(var, "diff.ignoresubmodules"))
165 handle_ignore_submodules_arg(&default_diff_options, value);
166
167 if (git_color_config(var, value, cb) < 0)
168 return -1;
169
170 return git_diff_basic_config(var, value, cb);
171 }
172
173 int git_diff_basic_config(const char *var, const char *value, void *cb)
174 {
175 if (!strcmp(var, "diff.renamelimit")) {
176 diff_rename_limit_default = git_config_int(var, value);
177 return 0;
178 }
179
180 switch (userdiff_config(var, value)) {
181 case 0: break;
182 case -1: return -1;
183 default: return 0;
184 }
185
186 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
187 int slot = parse_diff_color_slot(var, 11);
188 if (slot < 0)
189 return 0;
190 if (!value)
191 return config_error_nonbool(var);
192 color_parse(value, var, diff_colors[slot]);
193 return 0;
194 }
195
196 /* like GNU diff's --suppress-blank-empty option */
197 if (!strcmp(var, "diff.suppressblankempty") ||
198 /* for backwards compatibility */
199 !strcmp(var, "diff.suppress-blank-empty")) {
200 diff_suppress_blank_empty = git_config_bool(var, value);
201 return 0;
202 }
203
204 if (!strcmp(var, "diff.dirstat")) {
205 struct strbuf errmsg = STRBUF_INIT;
206 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
207 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
208 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
209 errmsg.buf);
210 strbuf_release(&errmsg);
211 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
212 return 0;
213 }
214
215 if (!prefixcmp(var, "submodule."))
216 return parse_submodule_config_option(var, value);
217
218 return git_default_config(var, value, cb);
219 }
220
221 static char *quote_two(const char *one, const char *two)
222 {
223 int need_one = quote_c_style(one, NULL, NULL, 1);
224 int need_two = quote_c_style(two, NULL, NULL, 1);
225 struct strbuf res = STRBUF_INIT;
226
227 if (need_one + need_two) {
228 strbuf_addch(&res, '"');
229 quote_c_style(one, &res, NULL, 1);
230 quote_c_style(two, &res, NULL, 1);
231 strbuf_addch(&res, '"');
232 } else {
233 strbuf_addstr(&res, one);
234 strbuf_addstr(&res, two);
235 }
236 return strbuf_detach(&res, NULL);
237 }
238
239 static const char *external_diff(void)
240 {
241 static const char *external_diff_cmd = NULL;
242 static int done_preparing = 0;
243
244 if (done_preparing)
245 return external_diff_cmd;
246 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
247 if (!external_diff_cmd)
248 external_diff_cmd = external_diff_cmd_cfg;
249 done_preparing = 1;
250 return external_diff_cmd;
251 }
252
253 static struct diff_tempfile {
254 const char *name; /* filename external diff should read from */
255 char hex[41];
256 char mode[10];
257 char tmp_path[PATH_MAX];
258 } diff_temp[2];
259
260 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
261
262 struct emit_callback {
263 int color_diff;
264 unsigned ws_rule;
265 int blank_at_eof_in_preimage;
266 int blank_at_eof_in_postimage;
267 int lno_in_preimage;
268 int lno_in_postimage;
269 sane_truncate_fn truncate;
270 const char **label_path;
271 struct diff_words_data *diff_words;
272 struct diff_options *opt;
273 int *found_changesp;
274 struct strbuf *header;
275 };
276
277 static int count_lines(const char *data, int size)
278 {
279 int count, ch, completely_empty = 1, nl_just_seen = 0;
280 count = 0;
281 while (0 < size--) {
282 ch = *data++;
283 if (ch == '\n') {
284 count++;
285 nl_just_seen = 1;
286 completely_empty = 0;
287 }
288 else {
289 nl_just_seen = 0;
290 completely_empty = 0;
291 }
292 }
293 if (completely_empty)
294 return 0;
295 if (!nl_just_seen)
296 count++; /* no trailing newline */
297 return count;
298 }
299
300 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
301 {
302 if (!DIFF_FILE_VALID(one)) {
303 mf->ptr = (char *)""; /* does not matter */
304 mf->size = 0;
305 return 0;
306 }
307 else if (diff_populate_filespec(one, 0))
308 return -1;
309
310 mf->ptr = one->data;
311 mf->size = one->size;
312 return 0;
313 }
314
315 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
316 static unsigned long diff_filespec_size(struct diff_filespec *one)
317 {
318 if (!DIFF_FILE_VALID(one))
319 return 0;
320 diff_populate_filespec(one, 1);
321 return one->size;
322 }
323
324 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
325 {
326 char *ptr = mf->ptr;
327 long size = mf->size;
328 int cnt = 0;
329
330 if (!size)
331 return cnt;
332 ptr += size - 1; /* pointing at the very end */
333 if (*ptr != '\n')
334 ; /* incomplete line */
335 else
336 ptr--; /* skip the last LF */
337 while (mf->ptr < ptr) {
338 char *prev_eol;
339 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
340 if (*prev_eol == '\n')
341 break;
342 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
343 break;
344 cnt++;
345 ptr = prev_eol - 1;
346 }
347 return cnt;
348 }
349
350 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
351 struct emit_callback *ecbdata)
352 {
353 int l1, l2, at;
354 unsigned ws_rule = ecbdata->ws_rule;
355 l1 = count_trailing_blank(mf1, ws_rule);
356 l2 = count_trailing_blank(mf2, ws_rule);
357 if (l2 <= l1) {
358 ecbdata->blank_at_eof_in_preimage = 0;
359 ecbdata->blank_at_eof_in_postimage = 0;
360 return;
361 }
362 at = count_lines(mf1->ptr, mf1->size);
363 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
364
365 at = count_lines(mf2->ptr, mf2->size);
366 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
367 }
368
369 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
370 int first, const char *line, int len)
371 {
372 int has_trailing_newline, has_trailing_carriage_return;
373 int nofirst;
374 FILE *file = o->file;
375
376 if (o->output_prefix) {
377 struct strbuf *msg = NULL;
378 msg = o->output_prefix(o, o->output_prefix_data);
379 assert(msg);
380 fwrite(msg->buf, msg->len, 1, file);
381 }
382
383 if (len == 0) {
384 has_trailing_newline = (first == '\n');
385 has_trailing_carriage_return = (!has_trailing_newline &&
386 (first == '\r'));
387 nofirst = has_trailing_newline || has_trailing_carriage_return;
388 } else {
389 has_trailing_newline = (len > 0 && line[len-1] == '\n');
390 if (has_trailing_newline)
391 len--;
392 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
393 if (has_trailing_carriage_return)
394 len--;
395 nofirst = 0;
396 }
397
398 if (len || !nofirst) {
399 fputs(set, file);
400 if (!nofirst)
401 fputc(first, file);
402 fwrite(line, len, 1, file);
403 fputs(reset, file);
404 }
405 if (has_trailing_carriage_return)
406 fputc('\r', file);
407 if (has_trailing_newline)
408 fputc('\n', file);
409 }
410
411 static void emit_line(struct diff_options *o, const char *set, const char *reset,
412 const char *line, int len)
413 {
414 emit_line_0(o, set, reset, line[0], line+1, len-1);
415 }
416
417 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
418 {
419 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
420 ecbdata->blank_at_eof_in_preimage &&
421 ecbdata->blank_at_eof_in_postimage &&
422 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
423 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
424 return 0;
425 return ws_blank_line(line, len, ecbdata->ws_rule);
426 }
427
428 static void emit_add_line(const char *reset,
429 struct emit_callback *ecbdata,
430 const char *line, int len)
431 {
432 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
433 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
434
435 if (!*ws)
436 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
437 else if (new_blank_line_at_eof(ecbdata, line, len))
438 /* Blank line at EOF - paint '+' as well */
439 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
440 else {
441 /* Emit just the prefix, then the rest. */
442 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
443 ws_check_emit(line, len, ecbdata->ws_rule,
444 ecbdata->opt->file, set, reset, ws);
445 }
446 }
447
448 static void emit_hunk_header(struct emit_callback *ecbdata,
449 const char *line, int len)
450 {
451 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
452 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
453 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
454 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
455 static const char atat[2] = { '@', '@' };
456 const char *cp, *ep;
457 struct strbuf msgbuf = STRBUF_INIT;
458 int org_len = len;
459 int i = 1;
460
461 /*
462 * As a hunk header must begin with "@@ -<old>, +<new> @@",
463 * it always is at least 10 bytes long.
464 */
465 if (len < 10 ||
466 memcmp(line, atat, 2) ||
467 !(ep = memmem(line + 2, len - 2, atat, 2))) {
468 emit_line(ecbdata->opt, plain, reset, line, len);
469 return;
470 }
471 ep += 2; /* skip over @@ */
472
473 /* The hunk header in fraginfo color */
474 strbuf_add(&msgbuf, frag, strlen(frag));
475 strbuf_add(&msgbuf, line, ep - line);
476 strbuf_add(&msgbuf, reset, strlen(reset));
477
478 /*
479 * trailing "\r\n"
480 */
481 for ( ; i < 3; i++)
482 if (line[len - i] == '\r' || line[len - i] == '\n')
483 len--;
484
485 /* blank before the func header */
486 for (cp = ep; ep - line < len; ep++)
487 if (*ep != ' ' && *ep != '\t')
488 break;
489 if (ep != cp) {
490 strbuf_add(&msgbuf, plain, strlen(plain));
491 strbuf_add(&msgbuf, cp, ep - cp);
492 strbuf_add(&msgbuf, reset, strlen(reset));
493 }
494
495 if (ep < line + len) {
496 strbuf_add(&msgbuf, func, strlen(func));
497 strbuf_add(&msgbuf, ep, line + len - ep);
498 strbuf_add(&msgbuf, reset, strlen(reset));
499 }
500
501 strbuf_add(&msgbuf, line + len, org_len - len);
502 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
503 strbuf_release(&msgbuf);
504 }
505
506 static struct diff_tempfile *claim_diff_tempfile(void) {
507 int i;
508 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
509 if (!diff_temp[i].name)
510 return diff_temp + i;
511 die("BUG: diff is failing to clean up its tempfiles");
512 }
513
514 static int remove_tempfile_installed;
515
516 static void remove_tempfile(void)
517 {
518 int i;
519 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
520 if (diff_temp[i].name == diff_temp[i].tmp_path)
521 unlink_or_warn(diff_temp[i].name);
522 diff_temp[i].name = NULL;
523 }
524 }
525
526 static void remove_tempfile_on_signal(int signo)
527 {
528 remove_tempfile();
529 sigchain_pop(signo);
530 raise(signo);
531 }
532
533 static void print_line_count(FILE *file, int count)
534 {
535 switch (count) {
536 case 0:
537 fprintf(file, "0,0");
538 break;
539 case 1:
540 fprintf(file, "1");
541 break;
542 default:
543 fprintf(file, "1,%d", count);
544 break;
545 }
546 }
547
548 static void emit_rewrite_lines(struct emit_callback *ecb,
549 int prefix, const char *data, int size)
550 {
551 const char *endp = NULL;
552 static const char *nneof = " No newline at end of file\n";
553 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
554 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
555
556 while (0 < size) {
557 int len;
558
559 endp = memchr(data, '\n', size);
560 len = endp ? (endp - data + 1) : size;
561 if (prefix != '+') {
562 ecb->lno_in_preimage++;
563 emit_line_0(ecb->opt, old, reset, '-',
564 data, len);
565 } else {
566 ecb->lno_in_postimage++;
567 emit_add_line(reset, ecb, data, len);
568 }
569 size -= len;
570 data += len;
571 }
572 if (!endp) {
573 const char *plain = diff_get_color(ecb->color_diff,
574 DIFF_PLAIN);
575 emit_line_0(ecb->opt, plain, reset, '\\',
576 nneof, strlen(nneof));
577 }
578 }
579
580 static void emit_rewrite_diff(const char *name_a,
581 const char *name_b,
582 struct diff_filespec *one,
583 struct diff_filespec *two,
584 struct userdiff_driver *textconv_one,
585 struct userdiff_driver *textconv_two,
586 struct diff_options *o)
587 {
588 int lc_a, lc_b;
589 const char *name_a_tab, *name_b_tab;
590 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
591 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
592 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
593 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
594 const char *a_prefix, *b_prefix;
595 char *data_one, *data_two;
596 size_t size_one, size_two;
597 struct emit_callback ecbdata;
598 char *line_prefix = "";
599 struct strbuf *msgbuf;
600
601 if (o && o->output_prefix) {
602 msgbuf = o->output_prefix(o, o->output_prefix_data);
603 line_prefix = msgbuf->buf;
604 }
605
606 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
607 a_prefix = o->b_prefix;
608 b_prefix = o->a_prefix;
609 } else {
610 a_prefix = o->a_prefix;
611 b_prefix = o->b_prefix;
612 }
613
614 name_a += (*name_a == '/');
615 name_b += (*name_b == '/');
616 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
617 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
618
619 strbuf_reset(&a_name);
620 strbuf_reset(&b_name);
621 quote_two_c_style(&a_name, a_prefix, name_a, 0);
622 quote_two_c_style(&b_name, b_prefix, name_b, 0);
623
624 size_one = fill_textconv(textconv_one, one, &data_one);
625 size_two = fill_textconv(textconv_two, two, &data_two);
626
627 memset(&ecbdata, 0, sizeof(ecbdata));
628 ecbdata.color_diff = want_color(o->use_color);
629 ecbdata.found_changesp = &o->found_changes;
630 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
631 ecbdata.opt = o;
632 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
633 mmfile_t mf1, mf2;
634 mf1.ptr = (char *)data_one;
635 mf2.ptr = (char *)data_two;
636 mf1.size = size_one;
637 mf2.size = size_two;
638 check_blank_at_eof(&mf1, &mf2, &ecbdata);
639 }
640 ecbdata.lno_in_preimage = 1;
641 ecbdata.lno_in_postimage = 1;
642
643 lc_a = count_lines(data_one, size_one);
644 lc_b = count_lines(data_two, size_two);
645 fprintf(o->file,
646 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
647 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
648 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
649 line_prefix, fraginfo);
650 if (!o->irreversible_delete)
651 print_line_count(o->file, lc_a);
652 else
653 fprintf(o->file, "?,?");
654 fprintf(o->file, " +");
655 print_line_count(o->file, lc_b);
656 fprintf(o->file, " @@%s\n", reset);
657 if (lc_a && !o->irreversible_delete)
658 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
659 if (lc_b)
660 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
661 if (textconv_one)
662 free((char *)data_one);
663 if (textconv_two)
664 free((char *)data_two);
665 }
666
667 struct diff_words_buffer {
668 mmfile_t text;
669 long alloc;
670 struct diff_words_orig {
671 const char *begin, *end;
672 } *orig;
673 int orig_nr, orig_alloc;
674 };
675
676 static void diff_words_append(char *line, unsigned long len,
677 struct diff_words_buffer *buffer)
678 {
679 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
680 line++;
681 len--;
682 memcpy(buffer->text.ptr + buffer->text.size, line, len);
683 buffer->text.size += len;
684 buffer->text.ptr[buffer->text.size] = '\0';
685 }
686
687 struct diff_words_style_elem {
688 const char *prefix;
689 const char *suffix;
690 const char *color; /* NULL; filled in by the setup code if
691 * color is enabled */
692 };
693
694 struct diff_words_style {
695 enum diff_words_type type;
696 struct diff_words_style_elem new, old, ctx;
697 const char *newline;
698 };
699
700 static struct diff_words_style diff_words_styles[] = {
701 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
702 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
703 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
704 };
705
706 struct diff_words_data {
707 struct diff_words_buffer minus, plus;
708 const char *current_plus;
709 int last_minus;
710 struct diff_options *opt;
711 regex_t *word_regex;
712 enum diff_words_type type;
713 struct diff_words_style *style;
714 };
715
716 static int fn_out_diff_words_write_helper(FILE *fp,
717 struct diff_words_style_elem *st_el,
718 const char *newline,
719 size_t count, const char *buf,
720 const char *line_prefix)
721 {
722 int print = 0;
723
724 while (count) {
725 char *p = memchr(buf, '\n', count);
726 if (print)
727 fputs(line_prefix, fp);
728 if (p != buf) {
729 if (st_el->color && fputs(st_el->color, fp) < 0)
730 return -1;
731 if (fputs(st_el->prefix, fp) < 0 ||
732 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
733 fputs(st_el->suffix, fp) < 0)
734 return -1;
735 if (st_el->color && *st_el->color
736 && fputs(GIT_COLOR_RESET, fp) < 0)
737 return -1;
738 }
739 if (!p)
740 return 0;
741 if (fputs(newline, fp) < 0)
742 return -1;
743 count -= p + 1 - buf;
744 buf = p + 1;
745 print = 1;
746 }
747 return 0;
748 }
749
750 /*
751 * '--color-words' algorithm can be described as:
752 *
753 * 1. collect a the minus/plus lines of a diff hunk, divided into
754 * minus-lines and plus-lines;
755 *
756 * 2. break both minus-lines and plus-lines into words and
757 * place them into two mmfile_t with one word for each line;
758 *
759 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
760 *
761 * And for the common parts of the both file, we output the plus side text.
762 * diff_words->current_plus is used to trace the current position of the plus file
763 * which printed. diff_words->last_minus is used to trace the last minus word
764 * printed.
765 *
766 * For '--graph' to work with '--color-words', we need to output the graph prefix
767 * on each line of color words output. Generally, there are two conditions on
768 * which we should output the prefix.
769 *
770 * 1. diff_words->last_minus == 0 &&
771 * diff_words->current_plus == diff_words->plus.text.ptr
772 *
773 * that is: the plus text must start as a new line, and if there is no minus
774 * word printed, a graph prefix must be printed.
775 *
776 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
777 * *(diff_words->current_plus - 1) == '\n'
778 *
779 * that is: a graph prefix must be printed following a '\n'
780 */
781 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
782 {
783 if ((diff_words->last_minus == 0 &&
784 diff_words->current_plus == diff_words->plus.text.ptr) ||
785 (diff_words->current_plus > diff_words->plus.text.ptr &&
786 *(diff_words->current_plus - 1) == '\n')) {
787 return 1;
788 } else {
789 return 0;
790 }
791 }
792
793 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
794 {
795 struct diff_words_data *diff_words = priv;
796 struct diff_words_style *style = diff_words->style;
797 int minus_first, minus_len, plus_first, plus_len;
798 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
799 struct diff_options *opt = diff_words->opt;
800 struct strbuf *msgbuf;
801 char *line_prefix = "";
802
803 if (line[0] != '@' || parse_hunk_header(line, len,
804 &minus_first, &minus_len, &plus_first, &plus_len))
805 return;
806
807 assert(opt);
808 if (opt->output_prefix) {
809 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
810 line_prefix = msgbuf->buf;
811 }
812
813 /* POSIX requires that first be decremented by one if len == 0... */
814 if (minus_len) {
815 minus_begin = diff_words->minus.orig[minus_first].begin;
816 minus_end =
817 diff_words->minus.orig[minus_first + minus_len - 1].end;
818 } else
819 minus_begin = minus_end =
820 diff_words->minus.orig[minus_first].end;
821
822 if (plus_len) {
823 plus_begin = diff_words->plus.orig[plus_first].begin;
824 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
825 } else
826 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
827
828 if (color_words_output_graph_prefix(diff_words)) {
829 fputs(line_prefix, diff_words->opt->file);
830 }
831 if (diff_words->current_plus != plus_begin) {
832 fn_out_diff_words_write_helper(diff_words->opt->file,
833 &style->ctx, style->newline,
834 plus_begin - diff_words->current_plus,
835 diff_words->current_plus, line_prefix);
836 if (*(plus_begin - 1) == '\n')
837 fputs(line_prefix, diff_words->opt->file);
838 }
839 if (minus_begin != minus_end) {
840 fn_out_diff_words_write_helper(diff_words->opt->file,
841 &style->old, style->newline,
842 minus_end - minus_begin, minus_begin,
843 line_prefix);
844 }
845 if (plus_begin != plus_end) {
846 fn_out_diff_words_write_helper(diff_words->opt->file,
847 &style->new, style->newline,
848 plus_end - plus_begin, plus_begin,
849 line_prefix);
850 }
851
852 diff_words->current_plus = plus_end;
853 diff_words->last_minus = minus_first;
854 }
855
856 /* This function starts looking at *begin, and returns 0 iff a word was found. */
857 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
858 int *begin, int *end)
859 {
860 if (word_regex && *begin < buffer->size) {
861 regmatch_t match[1];
862 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
863 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
864 '\n', match[0].rm_eo - match[0].rm_so);
865 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
866 *begin += match[0].rm_so;
867 return *begin >= *end;
868 }
869 return -1;
870 }
871
872 /* find the next word */
873 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
874 (*begin)++;
875 if (*begin >= buffer->size)
876 return -1;
877
878 /* find the end of the word */
879 *end = *begin + 1;
880 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
881 (*end)++;
882
883 return 0;
884 }
885
886 /*
887 * This function splits the words in buffer->text, stores the list with
888 * newline separator into out, and saves the offsets of the original words
889 * in buffer->orig.
890 */
891 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
892 regex_t *word_regex)
893 {
894 int i, j;
895 long alloc = 0;
896
897 out->size = 0;
898 out->ptr = NULL;
899
900 /* fake an empty "0th" word */
901 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
902 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
903 buffer->orig_nr = 1;
904
905 for (i = 0; i < buffer->text.size; i++) {
906 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
907 return;
908
909 /* store original boundaries */
910 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
911 buffer->orig_alloc);
912 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
913 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
914 buffer->orig_nr++;
915
916 /* store one word */
917 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
918 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
919 out->ptr[out->size + j - i] = '\n';
920 out->size += j - i + 1;
921
922 i = j - 1;
923 }
924 }
925
926 /* this executes the word diff on the accumulated buffers */
927 static void diff_words_show(struct diff_words_data *diff_words)
928 {
929 xpparam_t xpp;
930 xdemitconf_t xecfg;
931 mmfile_t minus, plus;
932 struct diff_words_style *style = diff_words->style;
933
934 struct diff_options *opt = diff_words->opt;
935 struct strbuf *msgbuf;
936 char *line_prefix = "";
937
938 assert(opt);
939 if (opt->output_prefix) {
940 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
941 line_prefix = msgbuf->buf;
942 }
943
944 /* special case: only removal */
945 if (!diff_words->plus.text.size) {
946 fputs(line_prefix, diff_words->opt->file);
947 fn_out_diff_words_write_helper(diff_words->opt->file,
948 &style->old, style->newline,
949 diff_words->minus.text.size,
950 diff_words->minus.text.ptr, line_prefix);
951 diff_words->minus.text.size = 0;
952 return;
953 }
954
955 diff_words->current_plus = diff_words->plus.text.ptr;
956 diff_words->last_minus = 0;
957
958 memset(&xpp, 0, sizeof(xpp));
959 memset(&xecfg, 0, sizeof(xecfg));
960 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
961 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
962 xpp.flags = 0;
963 /* as only the hunk header will be parsed, we need a 0-context */
964 xecfg.ctxlen = 0;
965 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
966 &xpp, &xecfg);
967 free(minus.ptr);
968 free(plus.ptr);
969 if (diff_words->current_plus != diff_words->plus.text.ptr +
970 diff_words->plus.text.size) {
971 if (color_words_output_graph_prefix(diff_words))
972 fputs(line_prefix, diff_words->opt->file);
973 fn_out_diff_words_write_helper(diff_words->opt->file,
974 &style->ctx, style->newline,
975 diff_words->plus.text.ptr + diff_words->plus.text.size
976 - diff_words->current_plus, diff_words->current_plus,
977 line_prefix);
978 }
979 diff_words->minus.text.size = diff_words->plus.text.size = 0;
980 }
981
982 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
983 static void diff_words_flush(struct emit_callback *ecbdata)
984 {
985 if (ecbdata->diff_words->minus.text.size ||
986 ecbdata->diff_words->plus.text.size)
987 diff_words_show(ecbdata->diff_words);
988 }
989
990 static void free_diff_words_data(struct emit_callback *ecbdata)
991 {
992 if (ecbdata->diff_words) {
993 diff_words_flush(ecbdata);
994 free (ecbdata->diff_words->minus.text.ptr);
995 free (ecbdata->diff_words->minus.orig);
996 free (ecbdata->diff_words->plus.text.ptr);
997 free (ecbdata->diff_words->plus.orig);
998 if (ecbdata->diff_words->word_regex) {
999 regfree(ecbdata->diff_words->word_regex);
1000 free(ecbdata->diff_words->word_regex);
1001 }
1002 free(ecbdata->diff_words);
1003 ecbdata->diff_words = NULL;
1004 }
1005 }
1006
1007 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1008 {
1009 if (want_color(diff_use_color))
1010 return diff_colors[ix];
1011 return "";
1012 }
1013
1014 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1015 {
1016 const char *cp;
1017 unsigned long allot;
1018 size_t l = len;
1019
1020 if (ecb->truncate)
1021 return ecb->truncate(line, len);
1022 cp = line;
1023 allot = l;
1024 while (0 < l) {
1025 (void) utf8_width(&cp, &l);
1026 if (!cp)
1027 break; /* truncated in the middle? */
1028 }
1029 return allot - l;
1030 }
1031
1032 static void find_lno(const char *line, struct emit_callback *ecbdata)
1033 {
1034 const char *p;
1035 ecbdata->lno_in_preimage = 0;
1036 ecbdata->lno_in_postimage = 0;
1037 p = strchr(line, '-');
1038 if (!p)
1039 return; /* cannot happen */
1040 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1041 p = strchr(p, '+');
1042 if (!p)
1043 return; /* cannot happen */
1044 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1045 }
1046
1047 static void fn_out_consume(void *priv, char *line, unsigned long len)
1048 {
1049 struct emit_callback *ecbdata = priv;
1050 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1051 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1052 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1053 struct diff_options *o = ecbdata->opt;
1054 char *line_prefix = "";
1055 struct strbuf *msgbuf;
1056
1057 if (o && o->output_prefix) {
1058 msgbuf = o->output_prefix(o, o->output_prefix_data);
1059 line_prefix = msgbuf->buf;
1060 }
1061
1062 if (ecbdata->header) {
1063 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1064 strbuf_reset(ecbdata->header);
1065 ecbdata->header = NULL;
1066 }
1067 *(ecbdata->found_changesp) = 1;
1068
1069 if (ecbdata->label_path[0]) {
1070 const char *name_a_tab, *name_b_tab;
1071
1072 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1073 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1074
1075 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1076 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1077 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1078 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1079 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1080 }
1081
1082 if (diff_suppress_blank_empty
1083 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1084 line[0] = '\n';
1085 len = 1;
1086 }
1087
1088 if (line[0] == '@') {
1089 if (ecbdata->diff_words)
1090 diff_words_flush(ecbdata);
1091 len = sane_truncate_line(ecbdata, line, len);
1092 find_lno(line, ecbdata);
1093 emit_hunk_header(ecbdata, line, len);
1094 if (line[len-1] != '\n')
1095 putc('\n', ecbdata->opt->file);
1096 return;
1097 }
1098
1099 if (len < 1) {
1100 emit_line(ecbdata->opt, reset, reset, line, len);
1101 if (ecbdata->diff_words
1102 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1103 fputs("~\n", ecbdata->opt->file);
1104 return;
1105 }
1106
1107 if (ecbdata->diff_words) {
1108 if (line[0] == '-') {
1109 diff_words_append(line, len,
1110 &ecbdata->diff_words->minus);
1111 return;
1112 } else if (line[0] == '+') {
1113 diff_words_append(line, len,
1114 &ecbdata->diff_words->plus);
1115 return;
1116 } else if (!prefixcmp(line, "\\ ")) {
1117 /*
1118 * Eat the "no newline at eof" marker as if we
1119 * saw a "+" or "-" line with nothing on it,
1120 * and return without diff_words_flush() to
1121 * defer processing. If this is the end of
1122 * preimage, more "+" lines may come after it.
1123 */
1124 return;
1125 }
1126 diff_words_flush(ecbdata);
1127 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1128 emit_line(ecbdata->opt, plain, reset, line, len);
1129 fputs("~\n", ecbdata->opt->file);
1130 } else {
1131 /*
1132 * Skip the prefix character, if any. With
1133 * diff_suppress_blank_empty, there may be
1134 * none.
1135 */
1136 if (line[0] != '\n') {
1137 line++;
1138 len--;
1139 }
1140 emit_line(ecbdata->opt, plain, reset, line, len);
1141 }
1142 return;
1143 }
1144
1145 if (line[0] != '+') {
1146 const char *color =
1147 diff_get_color(ecbdata->color_diff,
1148 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1149 ecbdata->lno_in_preimage++;
1150 if (line[0] == ' ')
1151 ecbdata->lno_in_postimage++;
1152 emit_line(ecbdata->opt, color, reset, line, len);
1153 } else {
1154 ecbdata->lno_in_postimage++;
1155 emit_add_line(reset, ecbdata, line + 1, len - 1);
1156 }
1157 }
1158
1159 static char *pprint_rename(const char *a, const char *b)
1160 {
1161 const char *old = a;
1162 const char *new = b;
1163 struct strbuf name = STRBUF_INIT;
1164 int pfx_length, sfx_length;
1165 int len_a = strlen(a);
1166 int len_b = strlen(b);
1167 int a_midlen, b_midlen;
1168 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1169 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1170
1171 if (qlen_a || qlen_b) {
1172 quote_c_style(a, &name, NULL, 0);
1173 strbuf_addstr(&name, " => ");
1174 quote_c_style(b, &name, NULL, 0);
1175 return strbuf_detach(&name, NULL);
1176 }
1177
1178 /* Find common prefix */
1179 pfx_length = 0;
1180 while (*old && *new && *old == *new) {
1181 if (*old == '/')
1182 pfx_length = old - a + 1;
1183 old++;
1184 new++;
1185 }
1186
1187 /* Find common suffix */
1188 old = a + len_a;
1189 new = b + len_b;
1190 sfx_length = 0;
1191 while (a <= old && b <= new && *old == *new) {
1192 if (*old == '/')
1193 sfx_length = len_a - (old - a);
1194 old--;
1195 new--;
1196 }
1197
1198 /*
1199 * pfx{mid-a => mid-b}sfx
1200 * {pfx-a => pfx-b}sfx
1201 * pfx{sfx-a => sfx-b}
1202 * name-a => name-b
1203 */
1204 a_midlen = len_a - pfx_length - sfx_length;
1205 b_midlen = len_b - pfx_length - sfx_length;
1206 if (a_midlen < 0)
1207 a_midlen = 0;
1208 if (b_midlen < 0)
1209 b_midlen = 0;
1210
1211 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1212 if (pfx_length + sfx_length) {
1213 strbuf_add(&name, a, pfx_length);
1214 strbuf_addch(&name, '{');
1215 }
1216 strbuf_add(&name, a + pfx_length, a_midlen);
1217 strbuf_addstr(&name, " => ");
1218 strbuf_add(&name, b + pfx_length, b_midlen);
1219 if (pfx_length + sfx_length) {
1220 strbuf_addch(&name, '}');
1221 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1222 }
1223 return strbuf_detach(&name, NULL);
1224 }
1225
1226 struct diffstat_t {
1227 int nr;
1228 int alloc;
1229 struct diffstat_file {
1230 char *from_name;
1231 char *name;
1232 char *print_name;
1233 unsigned is_unmerged:1;
1234 unsigned is_binary:1;
1235 unsigned is_renamed:1;
1236 uintmax_t added, deleted;
1237 } **files;
1238 };
1239
1240 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1241 const char *name_a,
1242 const char *name_b)
1243 {
1244 struct diffstat_file *x;
1245 x = xcalloc(sizeof (*x), 1);
1246 if (diffstat->nr == diffstat->alloc) {
1247 diffstat->alloc = alloc_nr(diffstat->alloc);
1248 diffstat->files = xrealloc(diffstat->files,
1249 diffstat->alloc * sizeof(x));
1250 }
1251 diffstat->files[diffstat->nr++] = x;
1252 if (name_b) {
1253 x->from_name = xstrdup(name_a);
1254 x->name = xstrdup(name_b);
1255 x->is_renamed = 1;
1256 }
1257 else {
1258 x->from_name = NULL;
1259 x->name = xstrdup(name_a);
1260 }
1261 return x;
1262 }
1263
1264 static void diffstat_consume(void *priv, char *line, unsigned long len)
1265 {
1266 struct diffstat_t *diffstat = priv;
1267 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1268
1269 if (line[0] == '+')
1270 x->added++;
1271 else if (line[0] == '-')
1272 x->deleted++;
1273 }
1274
1275 const char mime_boundary_leader[] = "------------";
1276
1277 static int scale_linear(int it, int width, int max_change)
1278 {
1279 /*
1280 * make sure that at least one '-' is printed if there were deletions,
1281 * and likewise for '+'.
1282 */
1283 if (max_change < 2)
1284 return it;
1285 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
1286 }
1287
1288 static void show_name(FILE *file,
1289 const char *prefix, const char *name, int len)
1290 {
1291 fprintf(file, " %s%-*s |", prefix, len, name);
1292 }
1293
1294 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1295 {
1296 if (cnt <= 0)
1297 return;
1298 fprintf(file, "%s", set);
1299 while (cnt--)
1300 putc(ch, file);
1301 fprintf(file, "%s", reset);
1302 }
1303
1304 static void fill_print_name(struct diffstat_file *file)
1305 {
1306 char *pname;
1307
1308 if (file->print_name)
1309 return;
1310
1311 if (!file->is_renamed) {
1312 struct strbuf buf = STRBUF_INIT;
1313 if (quote_c_style(file->name, &buf, NULL, 0)) {
1314 pname = strbuf_detach(&buf, NULL);
1315 } else {
1316 pname = file->name;
1317 strbuf_release(&buf);
1318 }
1319 } else {
1320 pname = pprint_rename(file->from_name, file->name);
1321 }
1322 file->print_name = pname;
1323 }
1324
1325 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1326 {
1327 struct strbuf sb = STRBUF_INIT;
1328 int ret;
1329
1330 if (!files) {
1331 assert(insertions == 0 && deletions == 0);
1332 return fputs(_(" 0 files changed\n"), fp);
1333 }
1334
1335 strbuf_addf(&sb,
1336 Q_(" %d file changed", " %d files changed", files),
1337 files);
1338
1339 /*
1340 * For binary diff, the caller may want to print "x files
1341 * changed" with insertions == 0 && deletions == 0.
1342 *
1343 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1344 * is probably less confusing (i.e skip over "2 files changed
1345 * but nothing about added/removed lines? Is this a bug in Git?").
1346 */
1347 if (insertions || deletions == 0) {
1348 /*
1349 * TRANSLATORS: "+" in (+) is a line addition marker;
1350 * do not translate it.
1351 */
1352 strbuf_addf(&sb,
1353 Q_(", %d insertion(+)", ", %d insertions(+)",
1354 insertions),
1355 insertions);
1356 }
1357
1358 if (deletions || insertions == 0) {
1359 /*
1360 * TRANSLATORS: "-" in (-) is a line removal marker;
1361 * do not translate it.
1362 */
1363 strbuf_addf(&sb,
1364 Q_(", %d deletion(-)", ", %d deletions(-)",
1365 deletions),
1366 deletions);
1367 }
1368 strbuf_addch(&sb, '\n');
1369 ret = fputs(sb.buf, fp);
1370 strbuf_release(&sb);
1371 return ret;
1372 }
1373
1374 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1375 {
1376 int i, len, add, del, adds = 0, dels = 0;
1377 uintmax_t max_change = 0, max_len = 0;
1378 int total_files = data->nr;
1379 int width, name_width, count;
1380 const char *reset, *add_c, *del_c;
1381 const char *line_prefix = "";
1382 int extra_shown = 0;
1383 struct strbuf *msg = NULL;
1384
1385 if (data->nr == 0)
1386 return;
1387
1388 if (options->output_prefix) {
1389 msg = options->output_prefix(options, options->output_prefix_data);
1390 line_prefix = msg->buf;
1391 }
1392
1393 width = options->stat_width ? options->stat_width : 80;
1394 name_width = options->stat_name_width ? options->stat_name_width : 50;
1395 count = options->stat_count ? options->stat_count : data->nr;
1396
1397 /* Sanity: give at least 5 columns to the graph,
1398 * but leave at least 10 columns for the name.
1399 */
1400 if (width < 25)
1401 width = 25;
1402 if (name_width < 10)
1403 name_width = 10;
1404 else if (width < name_width + 15)
1405 name_width = width - 15;
1406
1407 /* Find the longest filename and max number of changes */
1408 reset = diff_get_color_opt(options, DIFF_RESET);
1409 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1410 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1411
1412 for (i = 0; (i < count) && (i < data->nr); i++) {
1413 struct diffstat_file *file = data->files[i];
1414 uintmax_t change = file->added + file->deleted;
1415 if (!data->files[i]->is_renamed &&
1416 (change == 0)) {
1417 count++; /* not shown == room for one more */
1418 continue;
1419 }
1420 fill_print_name(file);
1421 len = strlen(file->print_name);
1422 if (max_len < len)
1423 max_len = len;
1424
1425 if (file->is_binary || file->is_unmerged)
1426 continue;
1427 if (max_change < change)
1428 max_change = change;
1429 }
1430 count = i; /* min(count, data->nr) */
1431
1432 /* Compute the width of the graph part;
1433 * 10 is for one blank at the beginning of the line plus
1434 * " | count " between the name and the graph.
1435 *
1436 * From here on, name_width is the width of the name area,
1437 * and width is the width of the graph area.
1438 */
1439 name_width = (name_width < max_len) ? name_width : max_len;
1440 if (width < (name_width + 10) + max_change)
1441 width = width - (name_width + 10);
1442 else
1443 width = max_change;
1444
1445 for (i = 0; i < count; i++) {
1446 const char *prefix = "";
1447 char *name = data->files[i]->print_name;
1448 uintmax_t added = data->files[i]->added;
1449 uintmax_t deleted = data->files[i]->deleted;
1450 int name_len;
1451
1452 if (!data->files[i]->is_renamed &&
1453 (added + deleted == 0)) {
1454 total_files--;
1455 continue;
1456 }
1457 /*
1458 * "scale" the filename
1459 */
1460 len = name_width;
1461 name_len = strlen(name);
1462 if (name_width < name_len) {
1463 char *slash;
1464 prefix = "...";
1465 len -= 3;
1466 name += name_len - len;
1467 slash = strchr(name, '/');
1468 if (slash)
1469 name = slash;
1470 }
1471
1472 if (data->files[i]->is_binary) {
1473 fprintf(options->file, "%s", line_prefix);
1474 show_name(options->file, prefix, name, len);
1475 fprintf(options->file, " Bin ");
1476 fprintf(options->file, "%s%"PRIuMAX"%s",
1477 del_c, deleted, reset);
1478 fprintf(options->file, " -> ");
1479 fprintf(options->file, "%s%"PRIuMAX"%s",
1480 add_c, added, reset);
1481 fprintf(options->file, " bytes");
1482 fprintf(options->file, "\n");
1483 continue;
1484 }
1485 else if (data->files[i]->is_unmerged) {
1486 fprintf(options->file, "%s", line_prefix);
1487 show_name(options->file, prefix, name, len);
1488 fprintf(options->file, " Unmerged\n");
1489 continue;
1490 }
1491
1492 /*
1493 * scale the add/delete
1494 */
1495 add = added;
1496 del = deleted;
1497 adds += add;
1498 dels += del;
1499
1500 if (width <= max_change) {
1501 add = scale_linear(add, width, max_change);
1502 del = scale_linear(del, width, max_change);
1503 }
1504 fprintf(options->file, "%s", line_prefix);
1505 show_name(options->file, prefix, name, len);
1506 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1507 added + deleted ? " " : "");
1508 show_graph(options->file, '+', add, add_c, reset);
1509 show_graph(options->file, '-', del, del_c, reset);
1510 fprintf(options->file, "\n");
1511 }
1512 for (i = count; i < data->nr; i++) {
1513 uintmax_t added = data->files[i]->added;
1514 uintmax_t deleted = data->files[i]->deleted;
1515 if (!data->files[i]->is_renamed &&
1516 (added + deleted == 0)) {
1517 total_files--;
1518 continue;
1519 }
1520 adds += added;
1521 dels += deleted;
1522 if (!extra_shown)
1523 fprintf(options->file, "%s ...\n", line_prefix);
1524 extra_shown = 1;
1525 }
1526 fprintf(options->file, "%s", line_prefix);
1527 print_stat_summary(options->file, total_files, adds, dels);
1528 }
1529
1530 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1531 {
1532 int i, adds = 0, dels = 0, total_files = data->nr;
1533
1534 if (data->nr == 0)
1535 return;
1536
1537 for (i = 0; i < data->nr; i++) {
1538 if (!data->files[i]->is_binary &&
1539 !data->files[i]->is_unmerged) {
1540 int added = data->files[i]->added;
1541 int deleted= data->files[i]->deleted;
1542 if (!data->files[i]->is_renamed &&
1543 (added + deleted == 0)) {
1544 total_files--;
1545 } else {
1546 adds += added;
1547 dels += deleted;
1548 }
1549 }
1550 }
1551 if (options->output_prefix) {
1552 struct strbuf *msg = NULL;
1553 msg = options->output_prefix(options,
1554 options->output_prefix_data);
1555 fprintf(options->file, "%s", msg->buf);
1556 }
1557 print_stat_summary(options->file, total_files, adds, dels);
1558 }
1559
1560 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1561 {
1562 int i;
1563
1564 if (data->nr == 0)
1565 return;
1566
1567 for (i = 0; i < data->nr; i++) {
1568 struct diffstat_file *file = data->files[i];
1569
1570 if (options->output_prefix) {
1571 struct strbuf *msg = NULL;
1572 msg = options->output_prefix(options,
1573 options->output_prefix_data);
1574 fprintf(options->file, "%s", msg->buf);
1575 }
1576
1577 if (file->is_binary)
1578 fprintf(options->file, "-\t-\t");
1579 else
1580 fprintf(options->file,
1581 "%"PRIuMAX"\t%"PRIuMAX"\t",
1582 file->added, file->deleted);
1583 if (options->line_termination) {
1584 fill_print_name(file);
1585 if (!file->is_renamed)
1586 write_name_quoted(file->name, options->file,
1587 options->line_termination);
1588 else {
1589 fputs(file->print_name, options->file);
1590 putc(options->line_termination, options->file);
1591 }
1592 } else {
1593 if (file->is_renamed) {
1594 putc('\0', options->file);
1595 write_name_quoted(file->from_name, options->file, '\0');
1596 }
1597 write_name_quoted(file->name, options->file, '\0');
1598 }
1599 }
1600 }
1601
1602 struct dirstat_file {
1603 const char *name;
1604 unsigned long changed;
1605 };
1606
1607 struct dirstat_dir {
1608 struct dirstat_file *files;
1609 int alloc, nr, permille, cumulative;
1610 };
1611
1612 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1613 unsigned long changed, const char *base, int baselen)
1614 {
1615 unsigned long this_dir = 0;
1616 unsigned int sources = 0;
1617 const char *line_prefix = "";
1618 struct strbuf *msg = NULL;
1619
1620 if (opt->output_prefix) {
1621 msg = opt->output_prefix(opt, opt->output_prefix_data);
1622 line_prefix = msg->buf;
1623 }
1624
1625 while (dir->nr) {
1626 struct dirstat_file *f = dir->files;
1627 int namelen = strlen(f->name);
1628 unsigned long this;
1629 char *slash;
1630
1631 if (namelen < baselen)
1632 break;
1633 if (memcmp(f->name, base, baselen))
1634 break;
1635 slash = strchr(f->name + baselen, '/');
1636 if (slash) {
1637 int newbaselen = slash + 1 - f->name;
1638 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1639 sources++;
1640 } else {
1641 this = f->changed;
1642 dir->files++;
1643 dir->nr--;
1644 sources += 2;
1645 }
1646 this_dir += this;
1647 }
1648
1649 /*
1650 * We don't report dirstat's for
1651 * - the top level
1652 * - or cases where everything came from a single directory
1653 * under this directory (sources == 1).
1654 */
1655 if (baselen && sources != 1) {
1656 if (this_dir) {
1657 int permille = this_dir * 1000 / changed;
1658 if (permille >= dir->permille) {
1659 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1660 permille / 10, permille % 10, baselen, base);
1661 if (!dir->cumulative)
1662 return 0;
1663 }
1664 }
1665 }
1666 return this_dir;
1667 }
1668
1669 static int dirstat_compare(const void *_a, const void *_b)
1670 {
1671 const struct dirstat_file *a = _a;
1672 const struct dirstat_file *b = _b;
1673 return strcmp(a->name, b->name);
1674 }
1675
1676 static void show_dirstat(struct diff_options *options)
1677 {
1678 int i;
1679 unsigned long changed;
1680 struct dirstat_dir dir;
1681 struct diff_queue_struct *q = &diff_queued_diff;
1682
1683 dir.files = NULL;
1684 dir.alloc = 0;
1685 dir.nr = 0;
1686 dir.permille = options->dirstat_permille;
1687 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1688
1689 changed = 0;
1690 for (i = 0; i < q->nr; i++) {
1691 struct diff_filepair *p = q->queue[i];
1692 const char *name;
1693 unsigned long copied, added, damage;
1694 int content_changed;
1695
1696 name = p->two->path ? p->two->path : p->one->path;
1697
1698 if (p->one->sha1_valid && p->two->sha1_valid)
1699 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1700 else
1701 content_changed = 1;
1702
1703 if (!content_changed) {
1704 /*
1705 * The SHA1 has not changed, so pre-/post-content is
1706 * identical. We can therefore skip looking at the
1707 * file contents altogether.
1708 */
1709 damage = 0;
1710 goto found_damage;
1711 }
1712
1713 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1714 /*
1715 * In --dirstat-by-file mode, we don't really need to
1716 * look at the actual file contents at all.
1717 * The fact that the SHA1 changed is enough for us to
1718 * add this file to the list of results
1719 * (with each file contributing equal damage).
1720 */
1721 damage = 1;
1722 goto found_damage;
1723 }
1724
1725 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1726 diff_populate_filespec(p->one, 0);
1727 diff_populate_filespec(p->two, 0);
1728 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1729 &copied, &added);
1730 diff_free_filespec_data(p->one);
1731 diff_free_filespec_data(p->two);
1732 } else if (DIFF_FILE_VALID(p->one)) {
1733 diff_populate_filespec(p->one, 1);
1734 copied = added = 0;
1735 diff_free_filespec_data(p->one);
1736 } else if (DIFF_FILE_VALID(p->two)) {
1737 diff_populate_filespec(p->two, 1);
1738 copied = 0;
1739 added = p->two->size;
1740 diff_free_filespec_data(p->two);
1741 } else
1742 continue;
1743
1744 /*
1745 * Original minus copied is the removed material,
1746 * added is the new material. They are both damages
1747 * made to the preimage.
1748 * If the resulting damage is zero, we know that
1749 * diffcore_count_changes() considers the two entries to
1750 * be identical, but since content_changed is true, we
1751 * know that there must have been _some_ kind of change,
1752 * so we force all entries to have damage > 0.
1753 */
1754 damage = (p->one->size - copied) + added;
1755 if (!damage)
1756 damage = 1;
1757
1758 found_damage:
1759 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1760 dir.files[dir.nr].name = name;
1761 dir.files[dir.nr].changed = damage;
1762 changed += damage;
1763 dir.nr++;
1764 }
1765
1766 /* This can happen even with many files, if everything was renames */
1767 if (!changed)
1768 return;
1769
1770 /* Show all directories with more than x% of the changes */
1771 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1772 gather_dirstat(options, &dir, changed, "", 0);
1773 }
1774
1775 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1776 {
1777 int i;
1778 unsigned long changed;
1779 struct dirstat_dir dir;
1780
1781 if (data->nr == 0)
1782 return;
1783
1784 dir.files = NULL;
1785 dir.alloc = 0;
1786 dir.nr = 0;
1787 dir.permille = options->dirstat_permille;
1788 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1789
1790 changed = 0;
1791 for (i = 0; i < data->nr; i++) {
1792 struct diffstat_file *file = data->files[i];
1793 unsigned long damage = file->added + file->deleted;
1794 if (file->is_binary)
1795 /*
1796 * binary files counts bytes, not lines. Must find some
1797 * way to normalize binary bytes vs. textual lines.
1798 * The following heuristic assumes that there are 64
1799 * bytes per "line".
1800 * This is stupid and ugly, but very cheap...
1801 */
1802 damage = (damage + 63) / 64;
1803 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1804 dir.files[dir.nr].name = file->name;
1805 dir.files[dir.nr].changed = damage;
1806 changed += damage;
1807 dir.nr++;
1808 }
1809
1810 /* This can happen even with many files, if everything was renames */
1811 if (!changed)
1812 return;
1813
1814 /* Show all directories with more than x% of the changes */
1815 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1816 gather_dirstat(options, &dir, changed, "", 0);
1817 }
1818
1819 static void free_diffstat_info(struct diffstat_t *diffstat)
1820 {
1821 int i;
1822 for (i = 0; i < diffstat->nr; i++) {
1823 struct diffstat_file *f = diffstat->files[i];
1824 if (f->name != f->print_name)
1825 free(f->print_name);
1826 free(f->name);
1827 free(f->from_name);
1828 free(f);
1829 }
1830 free(diffstat->files);
1831 }
1832
1833 struct checkdiff_t {
1834 const char *filename;
1835 int lineno;
1836 int conflict_marker_size;
1837 struct diff_options *o;
1838 unsigned ws_rule;
1839 unsigned status;
1840 };
1841
1842 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1843 {
1844 char firstchar;
1845 int cnt;
1846
1847 if (len < marker_size + 1)
1848 return 0;
1849 firstchar = line[0];
1850 switch (firstchar) {
1851 case '=': case '>': case '<': case '|':
1852 break;
1853 default:
1854 return 0;
1855 }
1856 for (cnt = 1; cnt < marker_size; cnt++)
1857 if (line[cnt] != firstchar)
1858 return 0;
1859 /* line[1] thru line[marker_size-1] are same as firstchar */
1860 if (len < marker_size + 1 || !isspace(line[marker_size]))
1861 return 0;
1862 return 1;
1863 }
1864
1865 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1866 {
1867 struct checkdiff_t *data = priv;
1868 int marker_size = data->conflict_marker_size;
1869 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
1870 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
1871 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
1872 char *err;
1873 char *line_prefix = "";
1874 struct strbuf *msgbuf;
1875
1876 assert(data->o);
1877 if (data->o->output_prefix) {
1878 msgbuf = data->o->output_prefix(data->o,
1879 data->o->output_prefix_data);
1880 line_prefix = msgbuf->buf;
1881 }
1882
1883 if (line[0] == '+') {
1884 unsigned bad;
1885 data->lineno++;
1886 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1887 data->status |= 1;
1888 fprintf(data->o->file,
1889 "%s%s:%d: leftover conflict marker\n",
1890 line_prefix, data->filename, data->lineno);
1891 }
1892 bad = ws_check(line + 1, len - 1, data->ws_rule);
1893 if (!bad)
1894 return;
1895 data->status |= bad;
1896 err = whitespace_error_string(bad);
1897 fprintf(data->o->file, "%s%s:%d: %s.\n",
1898 line_prefix, data->filename, data->lineno, err);
1899 free(err);
1900 emit_line(data->o, set, reset, line, 1);
1901 ws_check_emit(line + 1, len - 1, data->ws_rule,
1902 data->o->file, set, reset, ws);
1903 } else if (line[0] == ' ') {
1904 data->lineno++;
1905 } else if (line[0] == '@') {
1906 char *plus = strchr(line, '+');
1907 if (plus)
1908 data->lineno = strtol(plus, NULL, 10) - 1;
1909 else
1910 die("invalid diff");
1911 }
1912 }
1913
1914 static unsigned char *deflate_it(char *data,
1915 unsigned long size,
1916 unsigned long *result_size)
1917 {
1918 int bound;
1919 unsigned char *deflated;
1920 git_zstream stream;
1921
1922 memset(&stream, 0, sizeof(stream));
1923 git_deflate_init(&stream, zlib_compression_level);
1924 bound = git_deflate_bound(&stream, size);
1925 deflated = xmalloc(bound);
1926 stream.next_out = deflated;
1927 stream.avail_out = bound;
1928
1929 stream.next_in = (unsigned char *)data;
1930 stream.avail_in = size;
1931 while (git_deflate(&stream, Z_FINISH) == Z_OK)
1932 ; /* nothing */
1933 git_deflate_end(&stream);
1934 *result_size = stream.total_out;
1935 return deflated;
1936 }
1937
1938 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1939 {
1940 void *cp;
1941 void *delta;
1942 void *deflated;
1943 void *data;
1944 unsigned long orig_size;
1945 unsigned long delta_size;
1946 unsigned long deflate_size;
1947 unsigned long data_size;
1948
1949 /* We could do deflated delta, or we could do just deflated two,
1950 * whichever is smaller.
1951 */
1952 delta = NULL;
1953 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1954 if (one->size && two->size) {
1955 delta = diff_delta(one->ptr, one->size,
1956 two->ptr, two->size,
1957 &delta_size, deflate_size);
1958 if (delta) {
1959 void *to_free = delta;
1960 orig_size = delta_size;
1961 delta = deflate_it(delta, delta_size, &delta_size);
1962 free(to_free);
1963 }
1964 }
1965
1966 if (delta && delta_size < deflate_size) {
1967 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1968 free(deflated);
1969 data = delta;
1970 data_size = delta_size;
1971 }
1972 else {
1973 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1974 free(delta);
1975 data = deflated;
1976 data_size = deflate_size;
1977 }
1978
1979 /* emit data encoded in base85 */
1980 cp = data;
1981 while (data_size) {
1982 int bytes = (52 < data_size) ? 52 : data_size;
1983 char line[70];
1984 data_size -= bytes;
1985 if (bytes <= 26)
1986 line[0] = bytes + 'A' - 1;
1987 else
1988 line[0] = bytes - 26 + 'a' - 1;
1989 encode_85(line + 1, cp, bytes);
1990 cp = (char *) cp + bytes;
1991 fprintf(file, "%s", prefix);
1992 fputs(line, file);
1993 fputc('\n', file);
1994 }
1995 fprintf(file, "%s\n", prefix);
1996 free(data);
1997 }
1998
1999 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2000 {
2001 fprintf(file, "%sGIT binary patch\n", prefix);
2002 emit_binary_diff_body(file, one, two, prefix);
2003 emit_binary_diff_body(file, two, one, prefix);
2004 }
2005
2006 static void diff_filespec_load_driver(struct diff_filespec *one)
2007 {
2008 /* Use already-loaded driver */
2009 if (one->driver)
2010 return;
2011
2012 if (S_ISREG(one->mode))
2013 one->driver = userdiff_find_by_path(one->path);
2014
2015 /* Fallback to default settings */
2016 if (!one->driver)
2017 one->driver = userdiff_find_by_name("default");
2018 }
2019
2020 int diff_filespec_is_binary(struct diff_filespec *one)
2021 {
2022 if (one->is_binary == -1) {
2023 diff_filespec_load_driver(one);
2024 if (one->driver->binary != -1)
2025 one->is_binary = one->driver->binary;
2026 else {
2027 if (!one->data && DIFF_FILE_VALID(one))
2028 diff_populate_filespec(one, 0);
2029 if (one->data)
2030 one->is_binary = buffer_is_binary(one->data,
2031 one->size);
2032 if (one->is_binary == -1)
2033 one->is_binary = 0;
2034 }
2035 }
2036 return one->is_binary;
2037 }
2038
2039 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2040 {
2041 diff_filespec_load_driver(one);
2042 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2043 }
2044
2045 static const char *userdiff_word_regex(struct diff_filespec *one)
2046 {
2047 diff_filespec_load_driver(one);
2048 return one->driver->word_regex;
2049 }
2050
2051 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2052 {
2053 if (!options->a_prefix)
2054 options->a_prefix = a;
2055 if (!options->b_prefix)
2056 options->b_prefix = b;
2057 }
2058
2059 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2060 {
2061 if (!DIFF_FILE_VALID(one))
2062 return NULL;
2063
2064 diff_filespec_load_driver(one);
2065 return userdiff_get_textconv(one->driver);
2066 }
2067
2068 static void builtin_diff(const char *name_a,
2069 const char *name_b,
2070 struct diff_filespec *one,
2071 struct diff_filespec *two,
2072 const char *xfrm_msg,
2073 int must_show_header,
2074 struct diff_options *o,
2075 int complete_rewrite)
2076 {
2077 mmfile_t mf1, mf2;
2078 const char *lbl[2];
2079 char *a_one, *b_two;
2080 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2081 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2082 const char *a_prefix, *b_prefix;
2083 struct userdiff_driver *textconv_one = NULL;
2084 struct userdiff_driver *textconv_two = NULL;
2085 struct strbuf header = STRBUF_INIT;
2086 struct strbuf *msgbuf;
2087 char *line_prefix = "";
2088
2089 if (o->output_prefix) {
2090 msgbuf = o->output_prefix(o, o->output_prefix_data);
2091 line_prefix = msgbuf->buf;
2092 }
2093
2094 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2095 (!one->mode || S_ISGITLINK(one->mode)) &&
2096 (!two->mode || S_ISGITLINK(two->mode))) {
2097 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2098 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2099 show_submodule_summary(o->file, one ? one->path : two->path,
2100 one->sha1, two->sha1, two->dirty_submodule,
2101 del, add, reset);
2102 return;
2103 }
2104
2105 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2106 textconv_one = get_textconv(one);
2107 textconv_two = get_textconv(two);
2108 }
2109
2110 diff_set_mnemonic_prefix(o, "a/", "b/");
2111 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2112 a_prefix = o->b_prefix;
2113 b_prefix = o->a_prefix;
2114 } else {
2115 a_prefix = o->a_prefix;
2116 b_prefix = o->b_prefix;
2117 }
2118
2119 /* Never use a non-valid filename anywhere if at all possible */
2120 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2121 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2122
2123 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2124 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2125 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2126 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2127 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2128 if (lbl[0][0] == '/') {
2129 /* /dev/null */
2130 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2131 if (xfrm_msg)
2132 strbuf_addstr(&header, xfrm_msg);
2133 must_show_header = 1;
2134 }
2135 else if (lbl[1][0] == '/') {
2136 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2137 if (xfrm_msg)
2138 strbuf_addstr(&header, xfrm_msg);
2139 must_show_header = 1;
2140 }
2141 else {
2142 if (one->mode != two->mode) {
2143 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2144 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2145 must_show_header = 1;
2146 }
2147 if (xfrm_msg)
2148 strbuf_addstr(&header, xfrm_msg);
2149
2150 /*
2151 * we do not run diff between different kind
2152 * of objects.
2153 */
2154 if ((one->mode ^ two->mode) & S_IFMT)
2155 goto free_ab_and_return;
2156 if (complete_rewrite &&
2157 (textconv_one || !diff_filespec_is_binary(one)) &&
2158 (textconv_two || !diff_filespec_is_binary(two))) {
2159 fprintf(o->file, "%s", header.buf);
2160 strbuf_reset(&header);
2161 emit_rewrite_diff(name_a, name_b, one, two,
2162 textconv_one, textconv_two, o);
2163 o->found_changes = 1;
2164 goto free_ab_and_return;
2165 }
2166 }
2167
2168 if (o->irreversible_delete && lbl[1][0] == '/') {
2169 fprintf(o->file, "%s", header.buf);
2170 strbuf_reset(&header);
2171 goto free_ab_and_return;
2172 } else if (!DIFF_OPT_TST(o, TEXT) &&
2173 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2174 (!textconv_two && diff_filespec_is_binary(two)) )) {
2175 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2176 die("unable to read files to diff");
2177 /* Quite common confusing case */
2178 if (mf1.size == mf2.size &&
2179 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2180 if (must_show_header)
2181 fprintf(o->file, "%s", header.buf);
2182 goto free_ab_and_return;
2183 }
2184 fprintf(o->file, "%s", header.buf);
2185 strbuf_reset(&header);
2186 if (DIFF_OPT_TST(o, BINARY))
2187 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2188 else
2189 fprintf(o->file, "%sBinary files %s and %s differ\n",
2190 line_prefix, lbl[0], lbl[1]);
2191 o->found_changes = 1;
2192 } else {
2193 /* Crazy xdl interfaces.. */
2194 const char *diffopts = getenv("GIT_DIFF_OPTS");
2195 xpparam_t xpp;
2196 xdemitconf_t xecfg;
2197 struct emit_callback ecbdata;
2198 const struct userdiff_funcname *pe;
2199
2200 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
2201 fprintf(o->file, "%s", header.buf);
2202 strbuf_reset(&header);
2203 }
2204
2205 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2206 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2207
2208 pe = diff_funcname_pattern(one);
2209 if (!pe)
2210 pe = diff_funcname_pattern(two);
2211
2212 memset(&xpp, 0, sizeof(xpp));
2213 memset(&xecfg, 0, sizeof(xecfg));
2214 memset(&ecbdata, 0, sizeof(ecbdata));
2215 ecbdata.label_path = lbl;
2216 ecbdata.color_diff = want_color(o->use_color);
2217 ecbdata.found_changesp = &o->found_changes;
2218 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2219 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2220 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2221 ecbdata.opt = o;
2222 ecbdata.header = header.len ? &header : NULL;
2223 xpp.flags = o->xdl_opts;
2224 xecfg.ctxlen = o->context;
2225 xecfg.interhunkctxlen = o->interhunkcontext;
2226 xecfg.flags = XDL_EMIT_FUNCNAMES;
2227 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2228 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2229 if (pe)
2230 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2231 if (!diffopts)
2232 ;
2233 else if (!prefixcmp(diffopts, "--unified="))
2234 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2235 else if (!prefixcmp(diffopts, "-u"))
2236 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2237 if (o->word_diff) {
2238 int i;
2239
2240 ecbdata.diff_words =
2241 xcalloc(1, sizeof(struct diff_words_data));
2242 ecbdata.diff_words->type = o->word_diff;
2243 ecbdata.diff_words->opt = o;
2244 if (!o->word_regex)
2245 o->word_regex = userdiff_word_regex(one);
2246 if (!o->word_regex)
2247 o->word_regex = userdiff_word_regex(two);
2248 if (!o->word_regex)
2249 o->word_regex = diff_word_regex_cfg;
2250 if (o->word_regex) {
2251 ecbdata.diff_words->word_regex = (regex_t *)
2252 xmalloc(sizeof(regex_t));
2253 if (regcomp(ecbdata.diff_words->word_regex,
2254 o->word_regex,
2255 REG_EXTENDED | REG_NEWLINE))
2256 die ("Invalid regular expression: %s",
2257 o->word_regex);
2258 }
2259 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2260 if (o->word_diff == diff_words_styles[i].type) {
2261 ecbdata.diff_words->style =
2262 &diff_words_styles[i];
2263 break;
2264 }
2265 }
2266 if (want_color(o->use_color)) {
2267 struct diff_words_style *st = ecbdata.diff_words->style;
2268 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2269 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2270 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2271 }
2272 }
2273 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2274 &xpp, &xecfg);
2275 if (o->word_diff)
2276 free_diff_words_data(&ecbdata);
2277 if (textconv_one)
2278 free(mf1.ptr);
2279 if (textconv_two)
2280 free(mf2.ptr);
2281 xdiff_clear_find_func(&xecfg);
2282 }
2283
2284 free_ab_and_return:
2285 strbuf_release(&header);
2286 diff_free_filespec_data(one);
2287 diff_free_filespec_data(two);
2288 free(a_one);
2289 free(b_two);
2290 return;
2291 }
2292
2293 static void builtin_diffstat(const char *name_a, const char *name_b,
2294 struct diff_filespec *one,
2295 struct diff_filespec *two,
2296 struct diffstat_t *diffstat,
2297 struct diff_options *o,
2298 int complete_rewrite)
2299 {
2300 mmfile_t mf1, mf2;
2301 struct diffstat_file *data;
2302
2303 data = diffstat_add(diffstat, name_a, name_b);
2304
2305 if (!one || !two) {
2306 data->is_unmerged = 1;
2307 return;
2308 }
2309
2310 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2311 data->is_binary = 1;
2312 data->added = diff_filespec_size(two);
2313 data->deleted = diff_filespec_size(one);
2314 }
2315
2316 else if (complete_rewrite) {
2317 diff_populate_filespec(one, 0);
2318 diff_populate_filespec(two, 0);
2319 data->deleted = count_lines(one->data, one->size);
2320 data->added = count_lines(two->data, two->size);
2321 }
2322
2323 else {
2324 /* Crazy xdl interfaces.. */
2325 xpparam_t xpp;
2326 xdemitconf_t xecfg;
2327
2328 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2329 die("unable to read files to diff");
2330
2331 memset(&xpp, 0, sizeof(xpp));
2332 memset(&xecfg, 0, sizeof(xecfg));
2333 xpp.flags = o->xdl_opts;
2334 xecfg.ctxlen = o->context;
2335 xecfg.interhunkctxlen = o->interhunkcontext;
2336 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2337 &xpp, &xecfg);
2338 }
2339
2340 diff_free_filespec_data(one);
2341 diff_free_filespec_data(two);
2342 }
2343
2344 static void builtin_checkdiff(const char *name_a, const char *name_b,
2345 const char *attr_path,
2346 struct diff_filespec *one,
2347 struct diff_filespec *two,
2348 struct diff_options *o)
2349 {
2350 mmfile_t mf1, mf2;
2351 struct checkdiff_t data;
2352
2353 if (!two)
2354 return;
2355
2356 memset(&data, 0, sizeof(data));
2357 data.filename = name_b ? name_b : name_a;
2358 data.lineno = 0;
2359 data.o = o;
2360 data.ws_rule = whitespace_rule(attr_path);
2361 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2362
2363 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2364 die("unable to read files to diff");
2365
2366 /*
2367 * All the other codepaths check both sides, but not checking
2368 * the "old" side here is deliberate. We are checking the newly
2369 * introduced changes, and as long as the "new" side is text, we
2370 * can and should check what it introduces.
2371 */
2372 if (diff_filespec_is_binary(two))
2373 goto free_and_return;
2374 else {
2375 /* Crazy xdl interfaces.. */
2376 xpparam_t xpp;
2377 xdemitconf_t xecfg;
2378
2379 memset(&xpp, 0, sizeof(xpp));
2380 memset(&xecfg, 0, sizeof(xecfg));
2381 xecfg.ctxlen = 1; /* at least one context line */
2382 xpp.flags = 0;
2383 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2384 &xpp, &xecfg);
2385
2386 if (data.ws_rule & WS_BLANK_AT_EOF) {
2387 struct emit_callback ecbdata;
2388 int blank_at_eof;
2389
2390 ecbdata.ws_rule = data.ws_rule;
2391 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2392 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2393
2394 if (blank_at_eof) {
2395 static char *err;
2396 if (!err)
2397 err = whitespace_error_string(WS_BLANK_AT_EOF);
2398 fprintf(o->file, "%s:%d: %s.\n",
2399 data.filename, blank_at_eof, err);
2400 data.status = 1; /* report errors */
2401 }
2402 }
2403 }
2404 free_and_return:
2405 diff_free_filespec_data(one);
2406 diff_free_filespec_data(two);
2407 if (data.status)
2408 DIFF_OPT_SET(o, CHECK_FAILED);
2409 }
2410
2411 struct diff_filespec *alloc_filespec(const char *path)
2412 {
2413 int namelen = strlen(path);
2414 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2415
2416 memset(spec, 0, sizeof(*spec));
2417 spec->path = (char *)(spec + 1);
2418 memcpy(spec->path, path, namelen+1);
2419 spec->count = 1;
2420 spec->is_binary = -1;
2421 return spec;
2422 }
2423
2424 void free_filespec(struct diff_filespec *spec)
2425 {
2426 if (!--spec->count) {
2427 diff_free_filespec_data(spec);
2428 free(spec);
2429 }
2430 }
2431
2432 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2433 unsigned short mode)
2434 {
2435 if (mode) {
2436 spec->mode = canon_mode(mode);
2437 hashcpy(spec->sha1, sha1);
2438 spec->sha1_valid = !is_null_sha1(sha1);
2439 }
2440 }
2441
2442 /*
2443 * Given a name and sha1 pair, if the index tells us the file in
2444 * the work tree has that object contents, return true, so that
2445 * prepare_temp_file() does not have to inflate and extract.
2446 */
2447 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2448 {
2449 struct cache_entry *ce;
2450 struct stat st;
2451 int pos, len;
2452
2453 /*
2454 * We do not read the cache ourselves here, because the
2455 * benchmark with my previous version that always reads cache
2456 * shows that it makes things worse for diff-tree comparing
2457 * two linux-2.6 kernel trees in an already checked out work
2458 * tree. This is because most diff-tree comparisons deal with
2459 * only a small number of files, while reading the cache is
2460 * expensive for a large project, and its cost outweighs the
2461 * savings we get by not inflating the object to a temporary
2462 * file. Practically, this code only helps when we are used
2463 * by diff-cache --cached, which does read the cache before
2464 * calling us.
2465 */
2466 if (!active_cache)
2467 return 0;
2468
2469 /* We want to avoid the working directory if our caller
2470 * doesn't need the data in a normal file, this system
2471 * is rather slow with its stat/open/mmap/close syscalls,
2472 * and the object is contained in a pack file. The pack
2473 * is probably already open and will be faster to obtain
2474 * the data through than the working directory. Loose
2475 * objects however would tend to be slower as they need
2476 * to be individually opened and inflated.
2477 */
2478 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2479 return 0;
2480
2481 len = strlen(name);
2482 pos = cache_name_pos(name, len);
2483 if (pos < 0)
2484 return 0;
2485 ce = active_cache[pos];
2486
2487 /*
2488 * This is not the sha1 we are looking for, or
2489 * unreusable because it is not a regular file.
2490 */
2491 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2492 return 0;
2493
2494 /*
2495 * If ce is marked as "assume unchanged", there is no
2496 * guarantee that work tree matches what we are looking for.
2497 */
2498 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2499 return 0;
2500
2501 /*
2502 * If ce matches the file in the work tree, we can reuse it.
2503 */
2504 if (ce_uptodate(ce) ||
2505 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2506 return 1;
2507
2508 return 0;
2509 }
2510
2511 static int populate_from_stdin(struct diff_filespec *s)
2512 {
2513 struct strbuf buf = STRBUF_INIT;
2514 size_t size = 0;
2515
2516 if (strbuf_read(&buf, 0, 0) < 0)
2517 return error("error while reading from stdin %s",
2518 strerror(errno));
2519
2520 s->should_munmap = 0;
2521 s->data = strbuf_detach(&buf, &size);
2522 s->size = size;
2523 s->should_free = 1;
2524 return 0;
2525 }
2526
2527 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2528 {
2529 int len;
2530 char *data = xmalloc(100), *dirty = "";
2531
2532 /* Are we looking at the work tree? */
2533 if (s->dirty_submodule)
2534 dirty = "-dirty";
2535
2536 len = snprintf(data, 100,
2537 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2538 s->data = data;
2539 s->size = len;
2540 s->should_free = 1;
2541 if (size_only) {
2542 s->data = NULL;
2543 free(data);
2544 }
2545 return 0;
2546 }
2547
2548 /*
2549 * While doing rename detection and pickaxe operation, we may need to
2550 * grab the data for the blob (or file) for our own in-core comparison.
2551 * diff_filespec has data and size fields for this purpose.
2552 */
2553 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2554 {
2555 int err = 0;
2556 if (!DIFF_FILE_VALID(s))
2557 die("internal error: asking to populate invalid file.");
2558 if (S_ISDIR(s->mode))
2559 return -1;
2560
2561 if (s->data)
2562 return 0;
2563
2564 if (size_only && 0 < s->size)
2565 return 0;
2566
2567 if (S_ISGITLINK(s->mode))
2568 return diff_populate_gitlink(s, size_only);
2569
2570 if (!s->sha1_valid ||
2571 reuse_worktree_file(s->path, s->sha1, 0)) {
2572 struct strbuf buf = STRBUF_INIT;
2573 struct stat st;
2574 int fd;
2575
2576 if (!strcmp(s->path, "-"))
2577 return populate_from_stdin(s);
2578
2579 if (lstat(s->path, &st) < 0) {
2580 if (errno == ENOENT) {
2581 err_empty:
2582 err = -1;
2583 empty:
2584 s->data = (char *)"";
2585 s->size = 0;
2586 return err;
2587 }
2588 }
2589 s->size = xsize_t(st.st_size);
2590 if (!s->size)
2591 goto empty;
2592 if (S_ISLNK(st.st_mode)) {
2593 struct strbuf sb = STRBUF_INIT;
2594
2595 if (strbuf_readlink(&sb, s->path, s->size))
2596 goto err_empty;
2597 s->size = sb.len;
2598 s->data = strbuf_detach(&sb, NULL);
2599 s->should_free = 1;
2600 return 0;
2601 }
2602 if (size_only)
2603 return 0;
2604 fd = open(s->path, O_RDONLY);
2605 if (fd < 0)
2606 goto err_empty;
2607 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2608 close(fd);
2609 s->should_munmap = 1;
2610
2611 /*
2612 * Convert from working tree format to canonical git format
2613 */
2614 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2615 size_t size = 0;
2616 munmap(s->data, s->size);
2617 s->should_munmap = 0;
2618 s->data = strbuf_detach(&buf, &size);
2619 s->size = size;
2620 s->should_free = 1;
2621 }
2622 }
2623 else {
2624 enum object_type type;
2625 if (size_only) {
2626 type = sha1_object_info(s->sha1, &s->size);
2627 if (type < 0)
2628 die("unable to read %s", sha1_to_hex(s->sha1));
2629 } else {
2630 s->data = read_sha1_file(s->sha1, &type, &s->size);
2631 if (!s->data)
2632 die("unable to read %s", sha1_to_hex(s->sha1));
2633 s->should_free = 1;
2634 }
2635 }
2636 return 0;
2637 }
2638
2639 void diff_free_filespec_blob(struct diff_filespec *s)
2640 {
2641 if (s->should_free)
2642 free(s->data);
2643 else if (s->should_munmap)
2644 munmap(s->data, s->size);
2645
2646 if (s->should_free || s->should_munmap) {
2647 s->should_free = s->should_munmap = 0;
2648 s->data = NULL;
2649 }
2650 }
2651
2652 void diff_free_filespec_data(struct diff_filespec *s)
2653 {
2654 diff_free_filespec_blob(s);
2655 free(s->cnt_data);
2656 s->cnt_data = NULL;
2657 }
2658
2659 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2660 void *blob,
2661 unsigned long size,
2662 const unsigned char *sha1,
2663 int mode)
2664 {
2665 int fd;
2666 struct strbuf buf = STRBUF_INIT;
2667 struct strbuf template = STRBUF_INIT;
2668 char *path_dup = xstrdup(path);
2669 const char *base = basename(path_dup);
2670
2671 /* Generate "XXXXXX_basename.ext" */
2672 strbuf_addstr(&template, "XXXXXX_");
2673 strbuf_addstr(&template, base);
2674
2675 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2676 strlen(base) + 1);
2677 if (fd < 0)
2678 die_errno("unable to create temp-file");
2679 if (convert_to_working_tree(path,
2680 (const char *)blob, (size_t)size, &buf)) {
2681 blob = buf.buf;
2682 size = buf.len;
2683 }
2684 if (write_in_full(fd, blob, size) != size)
2685 die_errno("unable to write temp-file");
2686 close(fd);
2687 temp->name = temp->tmp_path;
2688 strcpy(temp->hex, sha1_to_hex(sha1));
2689 temp->hex[40] = 0;
2690 sprintf(temp->mode, "%06o", mode);
2691 strbuf_release(&buf);
2692 strbuf_release(&template);
2693 free(path_dup);
2694 }
2695
2696 static struct diff_tempfile *prepare_temp_file(const char *name,
2697 struct diff_filespec *one)
2698 {
2699 struct diff_tempfile *temp = claim_diff_tempfile();
2700
2701 if (!DIFF_FILE_VALID(one)) {
2702 not_a_valid_file:
2703 /* A '-' entry produces this for file-2, and
2704 * a '+' entry produces this for file-1.
2705 */
2706 temp->name = "/dev/null";
2707 strcpy(temp->hex, ".");
2708 strcpy(temp->mode, ".");
2709 return temp;
2710 }
2711
2712 if (!remove_tempfile_installed) {
2713 atexit(remove_tempfile);
2714 sigchain_push_common(remove_tempfile_on_signal);
2715 remove_tempfile_installed = 1;
2716 }
2717
2718 if (!one->sha1_valid ||
2719 reuse_worktree_file(name, one->sha1, 1)) {
2720 struct stat st;
2721 if (lstat(name, &st) < 0) {
2722 if (errno == ENOENT)
2723 goto not_a_valid_file;
2724 die_errno("stat(%s)", name);
2725 }
2726 if (S_ISLNK(st.st_mode)) {
2727 struct strbuf sb = STRBUF_INIT;
2728 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2729 die_errno("readlink(%s)", name);
2730 prep_temp_blob(name, temp, sb.buf, sb.len,
2731 (one->sha1_valid ?
2732 one->sha1 : null_sha1),
2733 (one->sha1_valid ?
2734 one->mode : S_IFLNK));
2735 strbuf_release(&sb);
2736 }
2737 else {
2738 /* we can borrow from the file in the work tree */
2739 temp->name = name;
2740 if (!one->sha1_valid)
2741 strcpy(temp->hex, sha1_to_hex(null_sha1));
2742 else
2743 strcpy(temp->hex, sha1_to_hex(one->sha1));
2744 /* Even though we may sometimes borrow the
2745 * contents from the work tree, we always want
2746 * one->mode. mode is trustworthy even when
2747 * !(one->sha1_valid), as long as
2748 * DIFF_FILE_VALID(one).
2749 */
2750 sprintf(temp->mode, "%06o", one->mode);
2751 }
2752 return temp;
2753 }
2754 else {
2755 if (diff_populate_filespec(one, 0))
2756 die("cannot read data blob for %s", one->path);
2757 prep_temp_blob(name, temp, one->data, one->size,
2758 one->sha1, one->mode);
2759 }
2760 return temp;
2761 }
2762
2763 /* An external diff command takes:
2764 *
2765 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2766 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2767 *
2768 */
2769 static void run_external_diff(const char *pgm,
2770 const char *name,
2771 const char *other,
2772 struct diff_filespec *one,
2773 struct diff_filespec *two,
2774 const char *xfrm_msg,
2775 int complete_rewrite)
2776 {
2777 const char *spawn_arg[10];
2778 int retval;
2779 const char **arg = &spawn_arg[0];
2780
2781 if (one && two) {
2782 struct diff_tempfile *temp_one, *temp_two;
2783 const char *othername = (other ? other : name);
2784 temp_one = prepare_temp_file(name, one);
2785 temp_two = prepare_temp_file(othername, two);
2786 *arg++ = pgm;
2787 *arg++ = name;
2788 *arg++ = temp_one->name;
2789 *arg++ = temp_one->hex;
2790 *arg++ = temp_one->mode;
2791 *arg++ = temp_two->name;
2792 *arg++ = temp_two->hex;
2793 *arg++ = temp_two->mode;
2794 if (other) {
2795 *arg++ = other;
2796 *arg++ = xfrm_msg;
2797 }
2798 } else {
2799 *arg++ = pgm;
2800 *arg++ = name;
2801 }
2802 *arg = NULL;
2803 fflush(NULL);
2804 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2805 remove_tempfile();
2806 if (retval) {
2807 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2808 exit(1);
2809 }
2810 }
2811
2812 static int similarity_index(struct diff_filepair *p)
2813 {
2814 return p->score * 100 / MAX_SCORE;
2815 }
2816
2817 static void fill_metainfo(struct strbuf *msg,
2818 const char *name,
2819 const char *other,
2820 struct diff_filespec *one,
2821 struct diff_filespec *two,
2822 struct diff_options *o,
2823 struct diff_filepair *p,
2824 int *must_show_header,
2825 int use_color)
2826 {
2827 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2828 const char *reset = diff_get_color(use_color, DIFF_RESET);
2829 struct strbuf *msgbuf;
2830 char *line_prefix = "";
2831
2832 *must_show_header = 1;
2833 if (o->output_prefix) {
2834 msgbuf = o->output_prefix(o, o->output_prefix_data);
2835 line_prefix = msgbuf->buf;
2836 }
2837 strbuf_init(msg, PATH_MAX * 2 + 300);
2838 switch (p->status) {
2839 case DIFF_STATUS_COPIED:
2840 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2841 line_prefix, set, similarity_index(p));
2842 strbuf_addf(msg, "%s\n%s%scopy from ",
2843 reset, line_prefix, set);
2844 quote_c_style(name, msg, NULL, 0);
2845 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2846 quote_c_style(other, msg, NULL, 0);
2847 strbuf_addf(msg, "%s\n", reset);
2848 break;
2849 case DIFF_STATUS_RENAMED:
2850 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2851 line_prefix, set, similarity_index(p));
2852 strbuf_addf(msg, "%s\n%s%srename from ",
2853 reset, line_prefix, set);
2854 quote_c_style(name, msg, NULL, 0);
2855 strbuf_addf(msg, "%s\n%s%srename to ",
2856 reset, line_prefix, set);
2857 quote_c_style(other, msg, NULL, 0);
2858 strbuf_addf(msg, "%s\n", reset);
2859 break;
2860 case DIFF_STATUS_MODIFIED:
2861 if (p->score) {
2862 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2863 line_prefix,
2864 set, similarity_index(p), reset);
2865 break;
2866 }
2867 /* fallthru */
2868 default:
2869 *must_show_header = 0;
2870 }
2871 if (one && two && hashcmp(one->sha1, two->sha1)) {
2872 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2873
2874 if (DIFF_OPT_TST(o, BINARY)) {
2875 mmfile_t mf;
2876 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2877 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2878 abbrev = 40;
2879 }
2880 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2881 find_unique_abbrev(one->sha1, abbrev));
2882 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2883 if (one->mode == two->mode)
2884 strbuf_addf(msg, " %06o", one->mode);
2885 strbuf_addf(msg, "%s\n", reset);
2886 }
2887 }
2888
2889 static void run_diff_cmd(const char *pgm,
2890 const char *name,
2891 const char *other,
2892 const char *attr_path,
2893 struct diff_filespec *one,
2894 struct diff_filespec *two,
2895 struct strbuf *msg,
2896 struct diff_options *o,
2897 struct diff_filepair *p)
2898 {
2899 const char *xfrm_msg = NULL;
2900 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2901 int must_show_header = 0;
2902
2903 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2904 pgm = NULL;
2905 else {
2906 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2907 if (drv && drv->external)
2908 pgm = drv->external;
2909 }
2910
2911 if (msg) {
2912 /*
2913 * don't use colors when the header is intended for an
2914 * external diff driver
2915 */
2916 fill_metainfo(msg, name, other, one, two, o, p,
2917 &must_show_header,
2918 want_color(o->use_color) && !pgm);
2919 xfrm_msg = msg->len ? msg->buf : NULL;
2920 }
2921
2922 if (pgm) {
2923 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2924 complete_rewrite);
2925 return;
2926 }
2927 if (one && two)
2928 builtin_diff(name, other ? other : name,
2929 one, two, xfrm_msg, must_show_header,
2930 o, complete_rewrite);
2931 else
2932 fprintf(o->file, "* Unmerged path %s\n", name);
2933 }
2934
2935 static void diff_fill_sha1_info(struct diff_filespec *one)
2936 {
2937 if (DIFF_FILE_VALID(one)) {
2938 if (!one->sha1_valid) {
2939 struct stat st;
2940 if (!strcmp(one->path, "-")) {
2941 hashcpy(one->sha1, null_sha1);
2942 return;
2943 }
2944 if (lstat(one->path, &st) < 0)
2945 die_errno("stat '%s'", one->path);
2946 if (index_path(one->sha1, one->path, &st, 0))
2947 die("cannot hash %s", one->path);
2948 }
2949 }
2950 else
2951 hashclr(one->sha1);
2952 }
2953
2954 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2955 {
2956 /* Strip the prefix but do not molest /dev/null and absolute paths */
2957 if (*namep && **namep != '/') {
2958 *namep += prefix_length;
2959 if (**namep == '/')
2960 ++*namep;
2961 }
2962 if (*otherp && **otherp != '/') {
2963 *otherp += prefix_length;
2964 if (**otherp == '/')
2965 ++*otherp;
2966 }
2967 }
2968
2969 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2970 {
2971 const char *pgm = external_diff();
2972 struct strbuf msg;
2973 struct diff_filespec *one = p->one;
2974 struct diff_filespec *two = p->two;
2975 const char *name;
2976 const char *other;
2977 const char *attr_path;
2978
2979 name = p->one->path;
2980 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2981 attr_path = name;
2982 if (o->prefix_length)
2983 strip_prefix(o->prefix_length, &name, &other);
2984
2985 if (DIFF_PAIR_UNMERGED(p)) {
2986 run_diff_cmd(pgm, name, NULL, attr_path,
2987 NULL, NULL, NULL, o, p);
2988 return;
2989 }
2990
2991 diff_fill_sha1_info(one);
2992 diff_fill_sha1_info(two);
2993
2994 if (!pgm &&
2995 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2996 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2997 /*
2998 * a filepair that changes between file and symlink
2999 * needs to be split into deletion and creation.
3000 */
3001 struct diff_filespec *null = alloc_filespec(two->path);
3002 run_diff_cmd(NULL, name, other, attr_path,
3003 one, null, &msg, o, p);
3004 free(null);
3005 strbuf_release(&msg);
3006
3007 null = alloc_filespec(one->path);
3008 run_diff_cmd(NULL, name, other, attr_path,
3009 null, two, &msg, o, p);
3010 free(null);
3011 }
3012 else
3013 run_diff_cmd(pgm, name, other, attr_path,
3014 one, two, &msg, o, p);
3015
3016 strbuf_release(&msg);
3017 }
3018
3019 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3020 struct diffstat_t *diffstat)
3021 {
3022 const char *name;
3023 const char *other;
3024 int complete_rewrite = 0;
3025
3026 if (DIFF_PAIR_UNMERGED(p)) {
3027 /* unmerged */
3028 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
3029 return;
3030 }
3031
3032 name = p->one->path;
3033 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3034
3035 if (o->prefix_length)
3036 strip_prefix(o->prefix_length, &name, &other);
3037
3038 diff_fill_sha1_info(p->one);
3039 diff_fill_sha1_info(p->two);
3040
3041 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3042 complete_rewrite = 1;
3043 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
3044 }
3045
3046 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3047 {
3048 const char *name;
3049 const char *other;
3050 const char *attr_path;
3051
3052 if (DIFF_PAIR_UNMERGED(p)) {
3053 /* unmerged */
3054 return;
3055 }
3056
3057 name = p->one->path;
3058 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3059 attr_path = other ? other : name;
3060
3061 if (o->prefix_length)
3062 strip_prefix(o->prefix_length, &name, &other);
3063
3064 diff_fill_sha1_info(p->one);
3065 diff_fill_sha1_info(p->two);
3066
3067 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3068 }
3069
3070 void diff_setup(struct diff_options *options)
3071 {
3072 memcpy(options, &default_diff_options, sizeof(*options));
3073
3074 options->file = stdout;
3075
3076 options->line_termination = '\n';
3077 options->break_opt = -1;
3078 options->rename_limit = -1;
3079 options->dirstat_permille = diff_dirstat_permille_default;
3080 options->context = 3;
3081
3082 options->change = diff_change;
3083 options->add_remove = diff_addremove;
3084 options->use_color = diff_use_color_default;
3085 options->detect_rename = diff_detect_rename_default;
3086
3087 if (diff_no_prefix) {
3088 options->a_prefix = options->b_prefix = "";
3089 } else if (!diff_mnemonic_prefix) {
3090 options->a_prefix = "a/";
3091 options->b_prefix = "b/";
3092 }
3093 }
3094
3095 int diff_setup_done(struct diff_options *options)
3096 {
3097 int count = 0;
3098
3099 if (options->output_format & DIFF_FORMAT_NAME)
3100 count++;
3101 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3102 count++;
3103 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3104 count++;
3105 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3106 count++;
3107 if (count > 1)
3108 die("--name-only, --name-status, --check and -s are mutually exclusive");
3109
3110 /*
3111 * Most of the time we can say "there are changes"
3112 * only by checking if there are changed paths, but
3113 * --ignore-whitespace* options force us to look
3114 * inside contents.
3115 */
3116
3117 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3118 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3119 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3120 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3121 else
3122 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3123
3124 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3125 options->detect_rename = DIFF_DETECT_COPY;
3126
3127 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3128 options->prefix = NULL;
3129 if (options->prefix)
3130 options->prefix_length = strlen(options->prefix);
3131 else
3132 options->prefix_length = 0;
3133
3134 if (options->output_format & (DIFF_FORMAT_NAME |
3135 DIFF_FORMAT_NAME_STATUS |
3136 DIFF_FORMAT_CHECKDIFF |
3137 DIFF_FORMAT_NO_OUTPUT))
3138 options->output_format &= ~(DIFF_FORMAT_RAW |
3139 DIFF_FORMAT_NUMSTAT |
3140 DIFF_FORMAT_DIFFSTAT |
3141 DIFF_FORMAT_SHORTSTAT |
3142 DIFF_FORMAT_DIRSTAT |
3143 DIFF_FORMAT_SUMMARY |
3144 DIFF_FORMAT_PATCH);
3145
3146 /*
3147 * These cases always need recursive; we do not drop caller-supplied
3148 * recursive bits for other formats here.
3149 */
3150 if (options->output_format & (DIFF_FORMAT_PATCH |
3151 DIFF_FORMAT_NUMSTAT |
3152 DIFF_FORMAT_DIFFSTAT |
3153 DIFF_FORMAT_SHORTSTAT |
3154 DIFF_FORMAT_DIRSTAT |
3155 DIFF_FORMAT_SUMMARY |
3156 DIFF_FORMAT_CHECKDIFF))
3157 DIFF_OPT_SET(options, RECURSIVE);
3158 /*
3159 * Also pickaxe would not work very well if you do not say recursive
3160 */
3161 if (options->pickaxe)
3162 DIFF_OPT_SET(options, RECURSIVE);
3163 /*
3164 * When patches are generated, submodules diffed against the work tree
3165 * must be checked for dirtiness too so it can be shown in the output
3166 */
3167 if (options->output_format & DIFF_FORMAT_PATCH)
3168 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3169
3170 if (options->detect_rename && options->rename_limit < 0)
3171 options->rename_limit = diff_rename_limit_default;
3172 if (options->setup & DIFF_SETUP_USE_CACHE) {
3173 if (!active_cache)
3174 /* read-cache does not die even when it fails
3175 * so it is safe for us to do this here. Also
3176 * it does not smudge active_cache or active_nr
3177 * when it fails, so we do not have to worry about
3178 * cleaning it up ourselves either.
3179 */
3180 read_cache();
3181 }
3182 if (options->abbrev <= 0 || 40 < options->abbrev)
3183 options->abbrev = 40; /* full */
3184
3185 /*
3186 * It does not make sense to show the first hit we happened
3187 * to have found. It does not make sense not to return with
3188 * exit code in such a case either.
3189 */
3190 if (DIFF_OPT_TST(options, QUICK)) {
3191 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3192 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3193 }
3194
3195 return 0;
3196 }
3197
3198 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3199 {
3200 char c, *eq;
3201 int len;
3202
3203 if (*arg != '-')
3204 return 0;
3205 c = *++arg;
3206 if (!c)
3207 return 0;
3208 if (c == arg_short) {
3209 c = *++arg;
3210 if (!c)
3211 return 1;
3212 if (val && isdigit(c)) {
3213 char *end;
3214 int n = strtoul(arg, &end, 10);
3215 if (*end)
3216 return 0;
3217 *val = n;
3218 return 1;
3219 }
3220 return 0;
3221 }
3222 if (c != '-')
3223 return 0;
3224 arg++;
3225 eq = strchr(arg, '=');
3226 if (eq)
3227 len = eq - arg;
3228 else
3229 len = strlen(arg);
3230 if (!len || strncmp(arg, arg_long, len))
3231 return 0;
3232 if (eq) {
3233 int n;
3234 char *end;
3235 if (!isdigit(*++eq))
3236 return 0;
3237 n = strtoul(eq, &end, 10);
3238 if (*end)
3239 return 0;
3240 *val = n;
3241 }
3242 return 1;
3243 }
3244
3245 static int diff_scoreopt_parse(const char *opt);
3246
3247 static inline int short_opt(char opt, const char **argv,
3248 const char **optarg)
3249 {
3250 const char *arg = argv[0];
3251 if (arg[0] != '-' || arg[1] != opt)
3252 return 0;
3253 if (arg[2] != '\0') {
3254 *optarg = arg + 2;
3255 return 1;
3256 }
3257 if (!argv[1])
3258 die("Option '%c' requires a value", opt);
3259 *optarg = argv[1];
3260 return 2;
3261 }
3262
3263 int parse_long_opt(const char *opt, const char **argv,
3264 const char **optarg)
3265 {
3266 const char *arg = argv[0];
3267 if (arg[0] != '-' || arg[1] != '-')
3268 return 0;
3269 arg += strlen("--");
3270 if (prefixcmp(arg, opt))
3271 return 0;
3272 arg += strlen(opt);
3273 if (*arg == '=') { /* sticked form: --option=value */
3274 *optarg = arg + 1;
3275 return 1;
3276 }
3277 if (*arg != '\0')
3278 return 0;
3279 /* separate form: --option value */
3280 if (!argv[1])
3281 die("Option '--%s' requires a value", opt);
3282 *optarg = argv[1];
3283 return 2;
3284 }
3285
3286 static int stat_opt(struct diff_options *options, const char **av)
3287 {
3288 const char *arg = av[0];
3289 char *end;
3290 int width = options->stat_width;
3291 int name_width = options->stat_name_width;
3292 int count = options->stat_count;
3293 int argcount = 1;
3294
3295 arg += strlen("--stat");
3296 end = (char *)arg;
3297
3298 switch (*arg) {
3299 case '-':
3300 if (!prefixcmp(arg, "-width")) {
3301 arg += strlen("-width");
3302 if (*arg == '=')
3303 width = strtoul(arg + 1, &end, 10);
3304 else if (!*arg && !av[1])
3305 die("Option '--stat-width' requires a value");
3306 else if (!*arg) {
3307 width = strtoul(av[1], &end, 10);
3308 argcount = 2;
3309 }
3310 } else if (!prefixcmp(arg, "-name-width")) {
3311 arg += strlen("-name-width");
3312 if (*arg == '=')
3313 name_width = strtoul(arg + 1, &end, 10);
3314 else if (!*arg && !av[1])
3315 die("Option '--stat-name-width' requires a value");
3316 else if (!*arg) {
3317 name_width = strtoul(av[1], &end, 10);
3318 argcount = 2;
3319 }
3320 } else if (!prefixcmp(arg, "-count")) {
3321 arg += strlen("-count");
3322 if (*arg == '=')
3323 count = strtoul(arg + 1, &end, 10);
3324 else if (!*arg && !av[1])
3325 die("Option '--stat-count' requires a value");
3326 else if (!*arg) {
3327 count = strtoul(av[1], &end, 10);
3328 argcount = 2;
3329 }
3330 }
3331 break;
3332 case '=':
3333 width = strtoul(arg+1, &end, 10);
3334 if (*end == ',')
3335 name_width = strtoul(end+1, &end, 10);
3336 if (*end == ',')
3337 count = strtoul(end+1, &end, 10);
3338 }
3339
3340 /* Important! This checks all the error cases! */
3341 if (*end)
3342 return 0;
3343 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3344 options->stat_name_width = name_width;
3345 options->stat_width = width;
3346 options->stat_count = count;
3347 return argcount;
3348 }
3349
3350 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3351 {
3352 struct strbuf errmsg = STRBUF_INIT;
3353 if (parse_dirstat_params(options, params, &errmsg))
3354 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3355 errmsg.buf);
3356 strbuf_release(&errmsg);
3357 /*
3358 * The caller knows a dirstat-related option is given from the command
3359 * line; allow it to say "return this_function();"
3360 */
3361 options->output_format |= DIFF_FORMAT_DIRSTAT;
3362 return 1;
3363 }
3364
3365 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3366 {
3367 const char *arg = av[0];
3368 const char *optarg;
3369 int argcount;
3370
3371 /* Output format options */
3372 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3373 options->output_format |= DIFF_FORMAT_PATCH;
3374 else if (opt_arg(arg, 'U', "unified", &options->context))
3375 options->output_format |= DIFF_FORMAT_PATCH;
3376 else if (!strcmp(arg, "--raw"))
3377 options->output_format |= DIFF_FORMAT_RAW;
3378 else if (!strcmp(arg, "--patch-with-raw"))
3379 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3380 else if (!strcmp(arg, "--numstat"))
3381 options->output_format |= DIFF_FORMAT_NUMSTAT;
3382 else if (!strcmp(arg, "--shortstat"))
3383 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3384 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3385 return parse_dirstat_opt(options, "");
3386 else if (!prefixcmp(arg, "-X"))
3387 return parse_dirstat_opt(options, arg + 2);
3388 else if (!prefixcmp(arg, "--dirstat="))
3389 return parse_dirstat_opt(options, arg + 10);
3390 else if (!strcmp(arg, "--cumulative"))
3391 return parse_dirstat_opt(options, "cumulative");
3392 else if (!strcmp(arg, "--dirstat-by-file"))
3393 return parse_dirstat_opt(options, "files");
3394 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3395 parse_dirstat_opt(options, "files");
3396 return parse_dirstat_opt(options, arg + 18);
3397 }
3398 else if (!strcmp(arg, "--check"))
3399 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3400 else if (!strcmp(arg, "--summary"))
3401 options->output_format |= DIFF_FORMAT_SUMMARY;
3402 else if (!strcmp(arg, "--patch-with-stat"))
3403 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3404 else if (!strcmp(arg, "--name-only"))
3405 options->output_format |= DIFF_FORMAT_NAME;
3406 else if (!strcmp(arg, "--name-status"))
3407 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3408 else if (!strcmp(arg, "-s"))
3409 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3410 else if (!prefixcmp(arg, "--stat"))
3411 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3412 return stat_opt(options, av);
3413
3414 /* renames options */
3415 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3416 !strcmp(arg, "--break-rewrites")) {
3417 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3418 return error("invalid argument to -B: %s", arg+2);
3419 }
3420 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3421 !strcmp(arg, "--find-renames")) {
3422 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3423 return error("invalid argument to -M: %s", arg+2);
3424 options->detect_rename = DIFF_DETECT_RENAME;
3425 }
3426 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3427 options->irreversible_delete = 1;
3428 }
3429 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3430 !strcmp(arg, "--find-copies")) {
3431 if (options->detect_rename == DIFF_DETECT_COPY)
3432 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3433 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3434 return error("invalid argument to -C: %s", arg+2);
3435 options->detect_rename = DIFF_DETECT_COPY;
3436 }
3437 else if (!strcmp(arg, "--no-renames"))
3438 options->detect_rename = 0;
3439 else if (!strcmp(arg, "--relative"))
3440 DIFF_OPT_SET(options, RELATIVE_NAME);
3441 else if (!prefixcmp(arg, "--relative=")) {
3442 DIFF_OPT_SET(options, RELATIVE_NAME);
3443 options->prefix = arg + 11;
3444 }
3445
3446 /* xdiff options */
3447 else if (!strcmp(arg, "--minimal"))
3448 DIFF_XDL_SET(options, NEED_MINIMAL);
3449 else if (!strcmp(arg, "--no-minimal"))
3450 DIFF_XDL_CLR(options, NEED_MINIMAL);
3451 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3452 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3453 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3454 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3455 else if (!strcmp(arg, "--ignore-space-at-eol"))
3456 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3457 else if (!strcmp(arg, "--patience"))
3458 DIFF_XDL_SET(options, PATIENCE_DIFF);
3459 else if (!strcmp(arg, "--histogram"))
3460 DIFF_XDL_SET(options, HISTOGRAM_DIFF);
3461
3462 /* flags options */
3463 else if (!strcmp(arg, "--binary")) {
3464 options->output_format |= DIFF_FORMAT_PATCH;
3465 DIFF_OPT_SET(options, BINARY);
3466 }
3467 else if (!strcmp(arg, "--full-index"))
3468 DIFF_OPT_SET(options, FULL_INDEX);
3469 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3470 DIFF_OPT_SET(options, TEXT);
3471 else if (!strcmp(arg, "-R"))
3472 DIFF_OPT_SET(options, REVERSE_DIFF);
3473 else if (!strcmp(arg, "--find-copies-harder"))
3474 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3475 else if (!strcmp(arg, "--follow"))
3476 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3477 else if (!strcmp(arg, "--color"))
3478 options->use_color = 1;
3479 else if (!prefixcmp(arg, "--color=")) {
3480 int value = git_config_colorbool(NULL, arg+8);
3481 if (value < 0)
3482 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3483 options->use_color = value;
3484 }
3485 else if (!strcmp(arg, "--no-color"))
3486 options->use_color = 0;
3487 else if (!strcmp(arg, "--color-words")) {
3488 options->use_color = 1;
3489 options->word_diff = DIFF_WORDS_COLOR;
3490 }
3491 else if (!prefixcmp(arg, "--color-words=")) {
3492 options->use_color = 1;
3493 options->word_diff = DIFF_WORDS_COLOR;
3494 options->word_regex = arg + 14;
3495 }
3496 else if (!strcmp(arg, "--word-diff")) {
3497 if (options->word_diff == DIFF_WORDS_NONE)
3498 options->word_diff = DIFF_WORDS_PLAIN;
3499 }
3500 else if (!prefixcmp(arg, "--word-diff=")) {
3501 const char *type = arg + 12;
3502 if (!strcmp(type, "plain"))
3503 options->word_diff = DIFF_WORDS_PLAIN;
3504 else if (!strcmp(type, "color")) {
3505 options->use_color = 1;
3506 options->word_diff = DIFF_WORDS_COLOR;
3507 }
3508 else if (!strcmp(type, "porcelain"))
3509 options->word_diff = DIFF_WORDS_PORCELAIN;
3510 else if (!strcmp(type, "none"))
3511 options->word_diff = DIFF_WORDS_NONE;
3512 else
3513 die("bad --word-diff argument: %s", type);
3514 }
3515 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3516 if (options->word_diff == DIFF_WORDS_NONE)
3517 options->word_diff = DIFF_WORDS_PLAIN;
3518 options->word_regex = optarg;
3519 return argcount;
3520 }
3521 else if (!strcmp(arg, "--exit-code"))
3522 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3523 else if (!strcmp(arg, "--quiet"))
3524 DIFF_OPT_SET(options, QUICK);
3525 else if (!strcmp(arg, "--ext-diff"))
3526 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3527 else if (!strcmp(arg, "--no-ext-diff"))
3528 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3529 else if (!strcmp(arg, "--textconv"))
3530 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3531 else if (!strcmp(arg, "--no-textconv"))
3532 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3533 else if (!strcmp(arg, "--ignore-submodules")) {
3534 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3535 handle_ignore_submodules_arg(options, "all");
3536 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3537 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3538 handle_ignore_submodules_arg(options, arg + 20);
3539 } else if (!strcmp(arg, "--submodule"))
3540 DIFF_OPT_SET(options, SUBMODULE_LOG);
3541 else if (!prefixcmp(arg, "--submodule=")) {
3542 if (!strcmp(arg + 12, "log"))
3543 DIFF_OPT_SET(options, SUBMODULE_LOG);
3544 }
3545
3546 /* misc options */
3547 else if (!strcmp(arg, "-z"))
3548 options->line_termination = 0;
3549 else if ((argcount = short_opt('l', av, &optarg))) {
3550 options->rename_limit = strtoul(optarg, NULL, 10);
3551 return argcount;
3552 }
3553 else if ((argcount = short_opt('S', av, &optarg))) {
3554 options->pickaxe = optarg;
3555 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3556 return argcount;
3557 } else if ((argcount = short_opt('G', av, &optarg))) {
3558 options->pickaxe = optarg;
3559 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3560 return argcount;
3561 }
3562 else if (!strcmp(arg, "--pickaxe-all"))
3563 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3564 else if (!strcmp(arg, "--pickaxe-regex"))
3565 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3566 else if ((argcount = short_opt('O', av, &optarg))) {
3567 options->orderfile = optarg;
3568 return argcount;
3569 }
3570 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3571 options->filter = optarg;
3572 return argcount;
3573 }
3574 else if (!strcmp(arg, "--abbrev"))
3575 options->abbrev = DEFAULT_ABBREV;
3576 else if (!prefixcmp(arg, "--abbrev=")) {
3577 options->abbrev = strtoul(arg + 9, NULL, 10);
3578 if (options->abbrev < MINIMUM_ABBREV)
3579 options->abbrev = MINIMUM_ABBREV;
3580 else if (40 < options->abbrev)
3581 options->abbrev = 40;
3582 }
3583 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3584 options->a_prefix = optarg;
3585 return argcount;
3586 }
3587 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3588 options->b_prefix = optarg;
3589 return argcount;
3590 }
3591 else if (!strcmp(arg, "--no-prefix"))
3592 options->a_prefix = options->b_prefix = "";
3593 else if (opt_arg(arg, '\0', "inter-hunk-context",
3594 &options->interhunkcontext))
3595 ;
3596 else if (!strcmp(arg, "-W"))
3597 DIFF_OPT_SET(options, FUNCCONTEXT);
3598 else if (!strcmp(arg, "--function-context"))
3599 DIFF_OPT_SET(options, FUNCCONTEXT);
3600 else if (!strcmp(arg, "--no-function-context"))
3601 DIFF_OPT_CLR(options, FUNCCONTEXT);
3602 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3603 options->file = fopen(optarg, "w");
3604 if (!options->file)
3605 die_errno("Could not open '%s'", optarg);
3606 options->close_file = 1;
3607 return argcount;
3608 } else
3609 return 0;
3610 return 1;
3611 }
3612
3613 int parse_rename_score(const char **cp_p)
3614 {
3615 unsigned long num, scale;
3616 int ch, dot;
3617 const char *cp = *cp_p;
3618
3619 num = 0;
3620 scale = 1;
3621 dot = 0;
3622 for (;;) {
3623 ch = *cp;
3624 if ( !dot && ch == '.' ) {
3625 scale = 1;
3626 dot = 1;
3627 } else if ( ch == '%' ) {
3628 scale = dot ? scale*100 : 100;
3629 cp++; /* % is always at the end */
3630 break;
3631 } else if ( ch >= '0' && ch <= '9' ) {
3632 if ( scale < 100000 ) {
3633 scale *= 10;
3634 num = (num*10) + (ch-'0');
3635 }
3636 } else {
3637 break;
3638 }
3639 cp++;
3640 }
3641 *cp_p = cp;
3642
3643 /* user says num divided by scale and we say internally that
3644 * is MAX_SCORE * num / scale.
3645 */
3646 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3647 }
3648
3649 static int diff_scoreopt_parse(const char *opt)
3650 {
3651 int opt1, opt2, cmd;
3652
3653 if (*opt++ != '-')
3654 return -1;
3655 cmd = *opt++;
3656 if (cmd == '-') {
3657 /* convert the long-form arguments into short-form versions */
3658 if (!prefixcmp(opt, "break-rewrites")) {
3659 opt += strlen("break-rewrites");
3660 if (*opt == 0 || *opt++ == '=')
3661 cmd = 'B';
3662 } else if (!prefixcmp(opt, "find-copies")) {
3663 opt += strlen("find-copies");
3664 if (*opt == 0 || *opt++ == '=')
3665 cmd = 'C';
3666 } else if (!prefixcmp(opt, "find-renames")) {
3667 opt += strlen("find-renames");
3668 if (*opt == 0 || *opt++ == '=')
3669 cmd = 'M';
3670 }
3671 }
3672 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3673 return -1; /* that is not a -M, -C nor -B option */
3674
3675 opt1 = parse_rename_score(&opt);
3676 if (cmd != 'B')
3677 opt2 = 0;
3678 else {
3679 if (*opt == 0)
3680 opt2 = 0;
3681 else if (*opt != '/')
3682 return -1; /* we expect -B80/99 or -B80 */
3683 else {
3684 opt++;
3685 opt2 = parse_rename_score(&opt);
3686 }
3687 }
3688 if (*opt != 0)
3689 return -1;
3690 return opt1 | (opt2 << 16);
3691 }
3692
3693 struct diff_queue_struct diff_queued_diff;
3694
3695 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3696 {
3697 if (queue->alloc <= queue->nr) {
3698 queue->alloc = alloc_nr(queue->alloc);
3699 queue->queue = xrealloc(queue->queue,
3700 sizeof(dp) * queue->alloc);
3701 }
3702 queue->queue[queue->nr++] = dp;
3703 }
3704
3705 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3706 struct diff_filespec *one,
3707 struct diff_filespec *two)
3708 {
3709 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3710 dp->one = one;
3711 dp->two = two;
3712 if (queue)
3713 diff_q(queue, dp);
3714 return dp;
3715 }
3716
3717 void diff_free_filepair(struct diff_filepair *p)
3718 {
3719 free_filespec(p->one);
3720 free_filespec(p->two);
3721 free(p);
3722 }
3723
3724 /* This is different from find_unique_abbrev() in that
3725 * it stuffs the result with dots for alignment.
3726 */
3727 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3728 {
3729 int abblen;
3730 const char *abbrev;
3731 if (len == 40)
3732 return sha1_to_hex(sha1);
3733
3734 abbrev = find_unique_abbrev(sha1, len);
3735 abblen = strlen(abbrev);
3736 if (abblen < 37) {
3737 static char hex[41];
3738 if (len < abblen && abblen <= len + 2)
3739 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3740 else
3741 sprintf(hex, "%s...", abbrev);
3742 return hex;
3743 }
3744 return sha1_to_hex(sha1);
3745 }
3746
3747 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3748 {
3749 int line_termination = opt->line_termination;
3750 int inter_name_termination = line_termination ? '\t' : '\0';
3751 if (opt->output_prefix) {
3752 struct strbuf *msg = NULL;
3753 msg = opt->output_prefix(opt, opt->output_prefix_data);
3754 fprintf(opt->file, "%s", msg->buf);
3755 }
3756
3757 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3758 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3759 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3760 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3761 }
3762 if (p->score) {
3763 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3764 inter_name_termination);
3765 } else {
3766 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3767 }
3768
3769 if (p->status == DIFF_STATUS_COPIED ||
3770 p->status == DIFF_STATUS_RENAMED) {
3771 const char *name_a, *name_b;
3772 name_a = p->one->path;
3773 name_b = p->two->path;
3774 strip_prefix(opt->prefix_length, &name_a, &name_b);
3775 write_name_quoted(name_a, opt->file, inter_name_termination);
3776 write_name_quoted(name_b, opt->file, line_termination);
3777 } else {
3778 const char *name_a, *name_b;
3779 name_a = p->one->mode ? p->one->path : p->two->path;
3780 name_b = NULL;
3781 strip_prefix(opt->prefix_length, &name_a, &name_b);
3782 write_name_quoted(name_a, opt->file, line_termination);
3783 }
3784 }
3785
3786 int diff_unmodified_pair(struct diff_filepair *p)
3787 {
3788 /* This function is written stricter than necessary to support
3789 * the currently implemented transformers, but the idea is to
3790 * let transformers to produce diff_filepairs any way they want,
3791 * and filter and clean them up here before producing the output.
3792 */
3793 struct diff_filespec *one = p->one, *two = p->two;
3794
3795 if (DIFF_PAIR_UNMERGED(p))
3796 return 0; /* unmerged is interesting */
3797
3798 /* deletion, addition, mode or type change
3799 * and rename are all interesting.
3800 */
3801 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3802 DIFF_PAIR_MODE_CHANGED(p) ||
3803 strcmp(one->path, two->path))
3804 return 0;
3805
3806 /* both are valid and point at the same path. that is, we are
3807 * dealing with a change.
3808 */
3809 if (one->sha1_valid && two->sha1_valid &&
3810 !hashcmp(one->sha1, two->sha1) &&
3811 !one->dirty_submodule && !two->dirty_submodule)
3812 return 1; /* no change */
3813 if (!one->sha1_valid && !two->sha1_valid)
3814 return 1; /* both look at the same file on the filesystem. */
3815 return 0;
3816 }
3817
3818 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3819 {
3820 if (diff_unmodified_pair(p))
3821 return;
3822
3823 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3824 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3825 return; /* no tree diffs in patch format */
3826
3827 run_diff(p, o);
3828 }
3829
3830 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3831 struct diffstat_t *diffstat)
3832 {
3833 if (diff_unmodified_pair(p))
3834 return;
3835
3836 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3837 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3838 return; /* no useful stat for tree diffs */
3839
3840 run_diffstat(p, o, diffstat);
3841 }
3842
3843 static void diff_flush_checkdiff(struct diff_filepair *p,
3844 struct diff_options *o)
3845 {
3846 if (diff_unmodified_pair(p))
3847 return;
3848
3849 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3850 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3851 return; /* nothing to check in tree diffs */
3852
3853 run_checkdiff(p, o);
3854 }
3855
3856 int diff_queue_is_empty(void)
3857 {
3858 struct diff_queue_struct *q = &diff_queued_diff;
3859 int i;
3860 for (i = 0; i < q->nr; i++)
3861 if (!diff_unmodified_pair(q->queue[i]))
3862 return 0;
3863 return 1;
3864 }
3865
3866 #if DIFF_DEBUG
3867 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3868 {
3869 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3870 x, one ? one : "",
3871 s->path,
3872 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3873 s->mode,
3874 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3875 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3876 x, one ? one : "",
3877 s->size, s->xfrm_flags);
3878 }
3879
3880 void diff_debug_filepair(const struct diff_filepair *p, int i)
3881 {
3882 diff_debug_filespec(p->one, i, "one");
3883 diff_debug_filespec(p->two, i, "two");
3884 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3885 p->score, p->status ? p->status : '?',
3886 p->one->rename_used, p->broken_pair);
3887 }
3888
3889 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3890 {
3891 int i;
3892 if (msg)
3893 fprintf(stderr, "%s\n", msg);
3894 fprintf(stderr, "q->nr = %d\n", q->nr);
3895 for (i = 0; i < q->nr; i++) {
3896 struct diff_filepair *p = q->queue[i];
3897 diff_debug_filepair(p, i);
3898 }
3899 }
3900 #endif
3901
3902 static void diff_resolve_rename_copy(void)
3903 {
3904 int i;
3905 struct diff_filepair *p;
3906 struct diff_queue_struct *q = &diff_queued_diff;
3907
3908 diff_debug_queue("resolve-rename-copy", q);
3909
3910 for (i = 0; i < q->nr; i++) {
3911 p = q->queue[i];
3912 p->status = 0; /* undecided */
3913 if (DIFF_PAIR_UNMERGED(p))
3914 p->status = DIFF_STATUS_UNMERGED;
3915 else if (!DIFF_FILE_VALID(p->one))
3916 p->status = DIFF_STATUS_ADDED;
3917 else if (!DIFF_FILE_VALID(p->two))
3918 p->status = DIFF_STATUS_DELETED;
3919 else if (DIFF_PAIR_TYPE_CHANGED(p))
3920 p->status = DIFF_STATUS_TYPE_CHANGED;
3921
3922 /* from this point on, we are dealing with a pair
3923 * whose both sides are valid and of the same type, i.e.
3924 * either in-place edit or rename/copy edit.
3925 */
3926 else if (DIFF_PAIR_RENAME(p)) {
3927 /*
3928 * A rename might have re-connected a broken
3929 * pair up, causing the pathnames to be the
3930 * same again. If so, that's not a rename at
3931 * all, just a modification..
3932 *
3933 * Otherwise, see if this source was used for
3934 * multiple renames, in which case we decrement
3935 * the count, and call it a copy.
3936 */
3937 if (!strcmp(p->one->path, p->two->path))
3938 p->status = DIFF_STATUS_MODIFIED;
3939 else if (--p->one->rename_used > 0)
3940 p->status = DIFF_STATUS_COPIED;
3941 else
3942 p->status = DIFF_STATUS_RENAMED;
3943 }
3944 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3945 p->one->mode != p->two->mode ||
3946 p->one->dirty_submodule ||
3947 p->two->dirty_submodule ||
3948 is_null_sha1(p->one->sha1))
3949 p->status = DIFF_STATUS_MODIFIED;
3950 else {
3951 /* This is a "no-change" entry and should not
3952 * happen anymore, but prepare for broken callers.
3953 */
3954 error("feeding unmodified %s to diffcore",
3955 p->one->path);
3956 p->status = DIFF_STATUS_UNKNOWN;
3957 }
3958 }
3959 diff_debug_queue("resolve-rename-copy done", q);
3960 }
3961
3962 static int check_pair_status(struct diff_filepair *p)
3963 {
3964 switch (p->status) {
3965 case DIFF_STATUS_UNKNOWN:
3966 return 0;
3967 case 0:
3968 die("internal error in diff-resolve-rename-copy");
3969 default:
3970 return 1;
3971 }
3972 }
3973
3974 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3975 {
3976 int fmt = opt->output_format;
3977
3978 if (fmt & DIFF_FORMAT_CHECKDIFF)
3979 diff_flush_checkdiff(p, opt);
3980 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3981 diff_flush_raw(p, opt);
3982 else if (fmt & DIFF_FORMAT_NAME) {
3983 const char *name_a, *name_b;
3984 name_a = p->two->path;
3985 name_b = NULL;
3986 strip_prefix(opt->prefix_length, &name_a, &name_b);
3987 write_name_quoted(name_a, opt->file, opt->line_termination);
3988 }
3989 }
3990
3991 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3992 {
3993 if (fs->mode)
3994 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3995 else
3996 fprintf(file, " %s ", newdelete);
3997 write_name_quoted(fs->path, file, '\n');
3998 }
3999
4000
4001 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4002 const char *line_prefix)
4003 {
4004 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4005 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4006 p->two->mode, show_name ? ' ' : '\n');
4007 if (show_name) {
4008 write_name_quoted(p->two->path, file, '\n');
4009 }
4010 }
4011 }
4012
4013 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4014 const char *line_prefix)
4015 {
4016 char *names = pprint_rename(p->one->path, p->two->path);
4017
4018 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4019 free(names);
4020 show_mode_change(file, p, 0, line_prefix);
4021 }
4022
4023 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4024 {
4025 FILE *file = opt->file;
4026 char *line_prefix = "";
4027
4028 if (opt->output_prefix) {
4029 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4030 line_prefix = buf->buf;
4031 }
4032
4033 switch(p->status) {
4034 case DIFF_STATUS_DELETED:
4035 fputs(line_prefix, file);
4036 show_file_mode_name(file, "delete", p->one);
4037 break;
4038 case DIFF_STATUS_ADDED:
4039 fputs(line_prefix, file);
4040 show_file_mode_name(file, "create", p->two);
4041 break;
4042 case DIFF_STATUS_COPIED:
4043 fputs(line_prefix, file);
4044 show_rename_copy(file, "copy", p, line_prefix);
4045 break;
4046 case DIFF_STATUS_RENAMED:
4047 fputs(line_prefix, file);
4048 show_rename_copy(file, "rename", p, line_prefix);
4049 break;
4050 default:
4051 if (p->score) {
4052 fprintf(file, "%s rewrite ", line_prefix);
4053 write_name_quoted(p->two->path, file, ' ');
4054 fprintf(file, "(%d%%)\n", similarity_index(p));
4055 }
4056 show_mode_change(file, p, !p->score, line_prefix);
4057 break;
4058 }
4059 }
4060
4061 struct patch_id_t {
4062 git_SHA_CTX *ctx;
4063 int patchlen;
4064 };
4065
4066 static int remove_space(char *line, int len)
4067 {
4068 int i;
4069 char *dst = line;
4070 unsigned char c;
4071
4072 for (i = 0; i < len; i++)
4073 if (!isspace((c = line[i])))
4074 *dst++ = c;
4075
4076 return dst - line;
4077 }
4078
4079 static void patch_id_consume(void *priv, char *line, unsigned long len)
4080 {
4081 struct patch_id_t *data = priv;
4082 int new_len;
4083
4084 /* Ignore line numbers when computing the SHA1 of the patch */
4085 if (!prefixcmp(line, "@@ -"))
4086 return;
4087
4088 new_len = remove_space(line, len);
4089
4090 git_SHA1_Update(data->ctx, line, new_len);
4091 data->patchlen += new_len;
4092 }
4093
4094 /* returns 0 upon success, and writes result into sha1 */
4095 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4096 {
4097 struct diff_queue_struct *q = &diff_queued_diff;
4098 int i;
4099 git_SHA_CTX ctx;
4100 struct patch_id_t data;
4101 char buffer[PATH_MAX * 4 + 20];
4102
4103 git_SHA1_Init(&ctx);
4104 memset(&data, 0, sizeof(struct patch_id_t));
4105 data.ctx = &ctx;
4106
4107 for (i = 0; i < q->nr; i++) {
4108 xpparam_t xpp;
4109 xdemitconf_t xecfg;
4110 mmfile_t mf1, mf2;
4111 struct diff_filepair *p = q->queue[i];
4112 int len1, len2;
4113
4114 memset(&xpp, 0, sizeof(xpp));
4115 memset(&xecfg, 0, sizeof(xecfg));
4116 if (p->status == 0)
4117 return error("internal diff status error");
4118 if (p->status == DIFF_STATUS_UNKNOWN)
4119 continue;
4120 if (diff_unmodified_pair(p))
4121 continue;
4122 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4123 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4124 continue;
4125 if (DIFF_PAIR_UNMERGED(p))
4126 continue;
4127
4128 diff_fill_sha1_info(p->one);
4129 diff_fill_sha1_info(p->two);
4130 if (fill_mmfile(&mf1, p->one) < 0 ||
4131 fill_mmfile(&mf2, p->two) < 0)
4132 return error("unable to read files to diff");
4133
4134 len1 = remove_space(p->one->path, strlen(p->one->path));
4135 len2 = remove_space(p->two->path, strlen(p->two->path));
4136 if (p->one->mode == 0)
4137 len1 = snprintf(buffer, sizeof(buffer),
4138 "diff--gita/%.*sb/%.*s"
4139 "newfilemode%06o"
4140 "---/dev/null"
4141 "+++b/%.*s",
4142 len1, p->one->path,
4143 len2, p->two->path,
4144 p->two->mode,
4145 len2, p->two->path);
4146 else if (p->two->mode == 0)
4147 len1 = snprintf(buffer, sizeof(buffer),
4148 "diff--gita/%.*sb/%.*s"
4149 "deletedfilemode%06o"
4150 "---a/%.*s"
4151 "+++/dev/null",
4152 len1, p->one->path,
4153 len2, p->two->path,
4154 p->one->mode,
4155 len1, p->one->path);
4156 else
4157 len1 = snprintf(buffer, sizeof(buffer),
4158 "diff--gita/%.*sb/%.*s"
4159 "---a/%.*s"
4160 "+++b/%.*s",
4161 len1, p->one->path,
4162 len2, p->two->path,
4163 len1, p->one->path,
4164 len2, p->two->path);
4165 git_SHA1_Update(&ctx, buffer, len1);
4166
4167 if (diff_filespec_is_binary(p->one) ||
4168 diff_filespec_is_binary(p->two)) {
4169 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4170 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4171 continue;
4172 }
4173
4174 xpp.flags = 0;
4175 xecfg.ctxlen = 3;
4176 xecfg.flags = 0;
4177 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4178 &xpp, &xecfg);
4179 }
4180
4181 git_SHA1_Final(sha1, &ctx);
4182 return 0;
4183 }
4184
4185 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4186 {
4187 struct diff_queue_struct *q = &diff_queued_diff;
4188 int i;
4189 int result = diff_get_patch_id(options, sha1);
4190
4191 for (i = 0; i < q->nr; i++)
4192 diff_free_filepair(q->queue[i]);
4193
4194 free(q->queue);
4195 DIFF_QUEUE_CLEAR(q);
4196
4197 return result;
4198 }
4199
4200 static int is_summary_empty(const struct diff_queue_struct *q)
4201 {
4202 int i;
4203
4204 for (i = 0; i < q->nr; i++) {
4205 const struct diff_filepair *p = q->queue[i];
4206
4207 switch (p->status) {
4208 case DIFF_STATUS_DELETED:
4209 case DIFF_STATUS_ADDED:
4210 case DIFF_STATUS_COPIED:
4211 case DIFF_STATUS_RENAMED:
4212 return 0;
4213 default:
4214 if (p->score)
4215 return 0;
4216 if (p->one->mode && p->two->mode &&
4217 p->one->mode != p->two->mode)
4218 return 0;
4219 break;
4220 }
4221 }
4222 return 1;
4223 }
4224
4225 static const char rename_limit_warning[] =
4226 "inexact rename detection was skipped due to too many files.";
4227
4228 static const char degrade_cc_to_c_warning[] =
4229 "only found copies from modified paths due to too many files.";
4230
4231 static const char rename_limit_advice[] =
4232 "you may want to set your %s variable to at least "
4233 "%d and retry the command.";
4234
4235 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4236 {
4237 if (degraded_cc)
4238 warning(degrade_cc_to_c_warning);
4239 else if (needed)
4240 warning(rename_limit_warning);
4241 else
4242 return;
4243 if (0 < needed && needed < 32767)
4244 warning(rename_limit_advice, varname, needed);
4245 }
4246
4247 void diff_flush(struct diff_options *options)
4248 {
4249 struct diff_queue_struct *q = &diff_queued_diff;
4250 int i, output_format = options->output_format;
4251 int separator = 0;
4252 int dirstat_by_line = 0;
4253
4254 /*
4255 * Order: raw, stat, summary, patch
4256 * or: name/name-status/checkdiff (other bits clear)
4257 */
4258 if (!q->nr)
4259 goto free_queue;
4260
4261 if (output_format & (DIFF_FORMAT_RAW |
4262 DIFF_FORMAT_NAME |
4263 DIFF_FORMAT_NAME_STATUS |
4264 DIFF_FORMAT_CHECKDIFF)) {
4265 for (i = 0; i < q->nr; i++) {
4266 struct diff_filepair *p = q->queue[i];
4267 if (check_pair_status(p))
4268 flush_one_pair(p, options);
4269 }
4270 separator++;
4271 }
4272
4273 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4274 dirstat_by_line = 1;
4275
4276 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4277 dirstat_by_line) {
4278 struct diffstat_t diffstat;
4279
4280 memset(&diffstat, 0, sizeof(struct diffstat_t));
4281 for (i = 0; i < q->nr; i++) {
4282 struct diff_filepair *p = q->queue[i];
4283 if (check_pair_status(p))
4284 diff_flush_stat(p, options, &diffstat);
4285 }
4286 if (output_format & DIFF_FORMAT_NUMSTAT)
4287 show_numstat(&diffstat, options);
4288 if (output_format & DIFF_FORMAT_DIFFSTAT)
4289 show_stats(&diffstat, options);
4290 if (output_format & DIFF_FORMAT_SHORTSTAT)
4291 show_shortstats(&diffstat, options);
4292 if (output_format & DIFF_FORMAT_DIRSTAT)
4293 show_dirstat_by_line(&diffstat, options);
4294 free_diffstat_info(&diffstat);
4295 separator++;
4296 }
4297 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4298 show_dirstat(options);
4299
4300 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4301 for (i = 0; i < q->nr; i++) {
4302 diff_summary(options, q->queue[i]);
4303 }
4304 separator++;
4305 }
4306
4307 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4308 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4309 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4310 /*
4311 * run diff_flush_patch for the exit status. setting
4312 * options->file to /dev/null should be safe, becaue we
4313 * aren't supposed to produce any output anyway.
4314 */
4315 if (options->close_file)
4316 fclose(options->file);
4317 options->file = fopen("/dev/null", "w");
4318 if (!options->file)
4319 die_errno("Could not open /dev/null");
4320 options->close_file = 1;
4321 for (i = 0; i < q->nr; i++) {
4322 struct diff_filepair *p = q->queue[i];
4323 if (check_pair_status(p))
4324 diff_flush_patch(p, options);
4325 if (options->found_changes)
4326 break;
4327 }
4328 }
4329
4330 if (output_format & DIFF_FORMAT_PATCH) {
4331 if (separator) {
4332 putc(options->line_termination, options->file);
4333 if (options->stat_sep) {
4334 /* attach patch instead of inline */
4335 fputs(options->stat_sep, options->file);
4336 }
4337 }
4338
4339 for (i = 0; i < q->nr; i++) {
4340 struct diff_filepair *p = q->queue[i];
4341 if (check_pair_status(p))
4342 diff_flush_patch(p, options);
4343 }
4344 }
4345
4346 if (output_format & DIFF_FORMAT_CALLBACK)
4347 options->format_callback(q, options, options->format_callback_data);
4348
4349 for (i = 0; i < q->nr; i++)
4350 diff_free_filepair(q->queue[i]);
4351 free_queue:
4352 free(q->queue);
4353 DIFF_QUEUE_CLEAR(q);
4354 if (options->close_file)
4355 fclose(options->file);
4356
4357 /*
4358 * Report the content-level differences with HAS_CHANGES;
4359 * diff_addremove/diff_change does not set the bit when
4360 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4361 */
4362 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4363 if (options->found_changes)
4364 DIFF_OPT_SET(options, HAS_CHANGES);
4365 else
4366 DIFF_OPT_CLR(options, HAS_CHANGES);
4367 }
4368 }
4369
4370 static void diffcore_apply_filter(const char *filter)
4371 {
4372 int i;
4373 struct diff_queue_struct *q = &diff_queued_diff;
4374 struct diff_queue_struct outq;
4375 DIFF_QUEUE_CLEAR(&outq);
4376
4377 if (!filter)
4378 return;
4379
4380 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4381 int found;
4382 for (i = found = 0; !found && i < q->nr; i++) {
4383 struct diff_filepair *p = q->queue[i];
4384 if (((p->status == DIFF_STATUS_MODIFIED) &&
4385 ((p->score &&
4386 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4387 (!p->score &&
4388 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4389 ((p->status != DIFF_STATUS_MODIFIED) &&
4390 strchr(filter, p->status)))
4391 found++;
4392 }
4393 if (found)
4394 return;
4395
4396 /* otherwise we will clear the whole queue
4397 * by copying the empty outq at the end of this
4398 * function, but first clear the current entries
4399 * in the queue.
4400 */
4401 for (i = 0; i < q->nr; i++)
4402 diff_free_filepair(q->queue[i]);
4403 }
4404 else {
4405 /* Only the matching ones */
4406 for (i = 0; i < q->nr; i++) {
4407 struct diff_filepair *p = q->queue[i];
4408
4409 if (((p->status == DIFF_STATUS_MODIFIED) &&
4410 ((p->score &&
4411 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4412 (!p->score &&
4413 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4414 ((p->status != DIFF_STATUS_MODIFIED) &&
4415 strchr(filter, p->status)))
4416 diff_q(&outq, p);
4417 else
4418 diff_free_filepair(p);
4419 }
4420 }
4421 free(q->queue);
4422 *q = outq;
4423 }
4424
4425 /* Check whether two filespecs with the same mode and size are identical */
4426 static int diff_filespec_is_identical(struct diff_filespec *one,
4427 struct diff_filespec *two)
4428 {
4429 if (S_ISGITLINK(one->mode))
4430 return 0;
4431 if (diff_populate_filespec(one, 0))
4432 return 0;
4433 if (diff_populate_filespec(two, 0))
4434 return 0;
4435 return !memcmp(one->data, two->data, one->size);
4436 }
4437
4438 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4439 {
4440 int i;
4441 struct diff_queue_struct *q = &diff_queued_diff;
4442 struct diff_queue_struct outq;
4443 DIFF_QUEUE_CLEAR(&outq);
4444
4445 for (i = 0; i < q->nr; i++) {
4446 struct diff_filepair *p = q->queue[i];
4447
4448 /*
4449 * 1. Entries that come from stat info dirtiness
4450 * always have both sides (iow, not create/delete),
4451 * one side of the object name is unknown, with
4452 * the same mode and size. Keep the ones that
4453 * do not match these criteria. They have real
4454 * differences.
4455 *
4456 * 2. At this point, the file is known to be modified,
4457 * with the same mode and size, and the object
4458 * name of one side is unknown. Need to inspect
4459 * the identical contents.
4460 */
4461 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4462 !DIFF_FILE_VALID(p->two) ||
4463 (p->one->sha1_valid && p->two->sha1_valid) ||
4464 (p->one->mode != p->two->mode) ||
4465 diff_populate_filespec(p->one, 1) ||
4466 diff_populate_filespec(p->two, 1) ||
4467 (p->one->size != p->two->size) ||
4468 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4469 diff_q(&outq, p);
4470 else {
4471 /*
4472 * The caller can subtract 1 from skip_stat_unmatch
4473 * to determine how many paths were dirty only
4474 * due to stat info mismatch.
4475 */
4476 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4477 diffopt->skip_stat_unmatch++;
4478 diff_free_filepair(p);
4479 }
4480 }
4481 free(q->queue);
4482 *q = outq;
4483 }
4484
4485 static int diffnamecmp(const void *a_, const void *b_)
4486 {
4487 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4488 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4489 const char *name_a, *name_b;
4490
4491 name_a = a->one ? a->one->path : a->two->path;
4492 name_b = b->one ? b->one->path : b->two->path;
4493 return strcmp(name_a, name_b);
4494 }
4495
4496 void diffcore_fix_diff_index(struct diff_options *options)
4497 {
4498 struct diff_queue_struct *q = &diff_queued_diff;
4499 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4500 }
4501
4502 void diffcore_std(struct diff_options *options)
4503 {
4504 if (options->skip_stat_unmatch)
4505 diffcore_skip_stat_unmatch(options);
4506 if (!options->found_follow) {
4507 /* See try_to_follow_renames() in tree-diff.c */
4508 if (options->break_opt != -1)
4509 diffcore_break(options->break_opt);
4510 if (options->detect_rename)
4511 diffcore_rename(options);
4512 if (options->break_opt != -1)
4513 diffcore_merge_broken();
4514 }
4515 if (options->pickaxe)
4516 diffcore_pickaxe(options);
4517 if (options->orderfile)
4518 diffcore_order(options->orderfile);
4519 if (!options->found_follow)
4520 /* See try_to_follow_renames() in tree-diff.c */
4521 diff_resolve_rename_copy();
4522 diffcore_apply_filter(options->filter);
4523
4524 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4525 DIFF_OPT_SET(options, HAS_CHANGES);
4526 else
4527 DIFF_OPT_CLR(options, HAS_CHANGES);
4528
4529 options->found_follow = 0;
4530 }
4531
4532 int diff_result_code(struct diff_options *opt, int status)
4533 {
4534 int result = 0;
4535
4536 diff_warn_rename_limit("diff.renamelimit",
4537 opt->needed_rename_limit,
4538 opt->degraded_cc_to_c);
4539 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4540 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4541 return status;
4542 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4543 DIFF_OPT_TST(opt, HAS_CHANGES))
4544 result |= 01;
4545 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4546 DIFF_OPT_TST(opt, CHECK_FAILED))
4547 result |= 02;
4548 return result;
4549 }
4550
4551 int diff_can_quit_early(struct diff_options *opt)
4552 {
4553 return (DIFF_OPT_TST(opt, QUICK) &&
4554 !opt->filter &&
4555 DIFF_OPT_TST(opt, HAS_CHANGES));
4556 }
4557
4558 /*
4559 * Shall changes to this submodule be ignored?
4560 *
4561 * Submodule changes can be configured to be ignored separately for each path,
4562 * but that configuration can be overridden from the command line.
4563 */
4564 static int is_submodule_ignored(const char *path, struct diff_options *options)
4565 {
4566 int ignored = 0;
4567 unsigned orig_flags = options->flags;
4568 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4569 set_diffopt_flags_from_submodule_config(options, path);
4570 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4571 ignored = 1;
4572 options->flags = orig_flags;
4573 return ignored;
4574 }
4575
4576 void diff_addremove(struct diff_options *options,
4577 int addremove, unsigned mode,
4578 const unsigned char *sha1,
4579 const char *concatpath, unsigned dirty_submodule)
4580 {
4581 struct diff_filespec *one, *two;
4582
4583 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4584 return;
4585
4586 /* This may look odd, but it is a preparation for
4587 * feeding "there are unchanged files which should
4588 * not produce diffs, but when you are doing copy
4589 * detection you would need them, so here they are"
4590 * entries to the diff-core. They will be prefixed
4591 * with something like '=' or '*' (I haven't decided
4592 * which but should not make any difference).
4593 * Feeding the same new and old to diff_change()
4594 * also has the same effect.
4595 * Before the final output happens, they are pruned after
4596 * merged into rename/copy pairs as appropriate.
4597 */
4598 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4599 addremove = (addremove == '+' ? '-' :
4600 addremove == '-' ? '+' : addremove);
4601
4602 if (options->prefix &&
4603 strncmp(concatpath, options->prefix, options->prefix_length))
4604 return;
4605
4606 one = alloc_filespec(concatpath);
4607 two = alloc_filespec(concatpath);
4608
4609 if (addremove != '+')
4610 fill_filespec(one, sha1, mode);
4611 if (addremove != '-') {
4612 fill_filespec(two, sha1, mode);
4613 two->dirty_submodule = dirty_submodule;
4614 }
4615
4616 diff_queue(&diff_queued_diff, one, two);
4617 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4618 DIFF_OPT_SET(options, HAS_CHANGES);
4619 }
4620
4621 void diff_change(struct diff_options *options,
4622 unsigned old_mode, unsigned new_mode,
4623 const unsigned char *old_sha1,
4624 const unsigned char *new_sha1,
4625 const char *concatpath,
4626 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4627 {
4628 struct diff_filespec *one, *two;
4629
4630 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4631 is_submodule_ignored(concatpath, options))
4632 return;
4633
4634 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4635 unsigned tmp;
4636 const unsigned char *tmp_c;
4637 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4638 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4639 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4640 new_dirty_submodule = tmp;
4641 }
4642
4643 if (options->prefix &&
4644 strncmp(concatpath, options->prefix, options->prefix_length))
4645 return;
4646
4647 one = alloc_filespec(concatpath);
4648 two = alloc_filespec(concatpath);
4649 fill_filespec(one, old_sha1, old_mode);
4650 fill_filespec(two, new_sha1, new_mode);
4651 one->dirty_submodule = old_dirty_submodule;
4652 two->dirty_submodule = new_dirty_submodule;
4653
4654 diff_queue(&diff_queued_diff, one, two);
4655 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4656 DIFF_OPT_SET(options, HAS_CHANGES);
4657 }
4658
4659 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4660 {
4661 struct diff_filepair *pair;
4662 struct diff_filespec *one, *two;
4663
4664 if (options->prefix &&
4665 strncmp(path, options->prefix, options->prefix_length))
4666 return NULL;
4667
4668 one = alloc_filespec(path);
4669 two = alloc_filespec(path);
4670 pair = diff_queue(&diff_queued_diff, one, two);
4671 pair->is_unmerged = 1;
4672 return pair;
4673 }
4674
4675 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4676 size_t *outsize)
4677 {
4678 struct diff_tempfile *temp;
4679 const char *argv[3];
4680 const char **arg = argv;
4681 struct child_process child;
4682 struct strbuf buf = STRBUF_INIT;
4683 int err = 0;
4684
4685 temp = prepare_temp_file(spec->path, spec);
4686 *arg++ = pgm;
4687 *arg++ = temp->name;
4688 *arg = NULL;
4689
4690 memset(&child, 0, sizeof(child));
4691 child.use_shell = 1;
4692 child.argv = argv;
4693 child.out = -1;
4694 if (start_command(&child)) {
4695 remove_tempfile();
4696 return NULL;
4697 }
4698
4699 if (strbuf_read(&buf, child.out, 0) < 0)
4700 err = error("error reading from textconv command '%s'", pgm);
4701 close(child.out);
4702
4703 if (finish_command(&child) || err) {
4704 strbuf_release(&buf);
4705 remove_tempfile();
4706 return NULL;
4707 }
4708 remove_tempfile();
4709
4710 return strbuf_detach(&buf, outsize);
4711 }
4712
4713 size_t fill_textconv(struct userdiff_driver *driver,
4714 struct diff_filespec *df,
4715 char **outbuf)
4716 {
4717 size_t size;
4718
4719 if (!driver || !driver->textconv) {
4720 if (!DIFF_FILE_VALID(df)) {
4721 *outbuf = "";
4722 return 0;
4723 }
4724 if (diff_populate_filespec(df, 0))
4725 die("unable to read files to diff");
4726 *outbuf = df->data;
4727 return df->size;
4728 }
4729
4730 if (driver->textconv_cache && df->sha1_valid) {
4731 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4732 &size);
4733 if (*outbuf)
4734 return size;
4735 }
4736
4737 *outbuf = run_textconv(driver->textconv, df, &size);
4738 if (!*outbuf)
4739 die("unable to read files to diff");
4740
4741 if (driver->textconv_cache && df->sha1_valid) {
4742 /* ignore errors, as we might be in a readonly repository */
4743 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4744 size);
4745 /*
4746 * we could save up changes and flush them all at the end,
4747 * but we would need an extra call after all diffing is done.
4748 * Since generating a cache entry is the slow path anyway,
4749 * this extra overhead probably isn't a big deal.
4750 */
4751 notes_cache_write(driver->textconv_cache);
4752 }
4753
4754 return size;
4755 }
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