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Merge branch 'maint' of git://github.com/git-l10n/git-po into maint
[alt-git.git] / diff.c
blob7da16c9590805dc687d7dc67acac2cb104144036
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_stat_graph_width;
35 static int diff_dirstat_permille_default = 30;
36 static struct diff_options default_diff_options;
37
38 static char diff_colors[][COLOR_MAXLEN] = {
39 GIT_COLOR_RESET,
40 GIT_COLOR_NORMAL, /* PLAIN */
41 GIT_COLOR_BOLD, /* METAINFO */
42 GIT_COLOR_CYAN, /* FRAGINFO */
43 GIT_COLOR_RED, /* OLD */
44 GIT_COLOR_GREEN, /* NEW */
45 GIT_COLOR_YELLOW, /* COMMIT */
46 GIT_COLOR_BG_RED, /* WHITESPACE */
47 GIT_COLOR_NORMAL, /* FUNCINFO */
48 };
49
50 static int parse_diff_color_slot(const char *var, int ofs)
51 {
52 if (!strcasecmp(var+ofs, "plain"))
53 return DIFF_PLAIN;
54 if (!strcasecmp(var+ofs, "meta"))
55 return DIFF_METAINFO;
56 if (!strcasecmp(var+ofs, "frag"))
57 return DIFF_FRAGINFO;
58 if (!strcasecmp(var+ofs, "old"))
59 return DIFF_FILE_OLD;
60 if (!strcasecmp(var+ofs, "new"))
61 return DIFF_FILE_NEW;
62 if (!strcasecmp(var+ofs, "commit"))
63 return DIFF_COMMIT;
64 if (!strcasecmp(var+ofs, "whitespace"))
65 return DIFF_WHITESPACE;
66 if (!strcasecmp(var+ofs, "func"))
67 return DIFF_FUNCINFO;
68 return -1;
69 }
70
71 static int parse_dirstat_params(struct diff_options *options, const char *params,
72 struct strbuf *errmsg)
73 {
74 const char *p = params;
75 int p_len, ret = 0;
76
77 while (*p) {
78 p_len = strchrnul(p, ',') - p;
79 if (!memcmp(p, "changes", p_len)) {
80 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
81 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
82 } else if (!memcmp(p, "lines", p_len)) {
83 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
84 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
85 } else if (!memcmp(p, "files", p_len)) {
86 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
87 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
88 } else if (!memcmp(p, "noncumulative", p_len)) {
89 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
90 } else if (!memcmp(p, "cumulative", p_len)) {
91 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
92 } else if (isdigit(*p)) {
93 char *end;
94 int permille = strtoul(p, &end, 10) * 10;
95 if (*end == '.' && isdigit(*++end)) {
96 /* only use first digit */
97 permille += *end - '0';
98 /* .. and ignore any further digits */
99 while (isdigit(*++end))
100 ; /* nothing */
101 }
102 if (end - p == p_len)
103 options->dirstat_permille = permille;
104 else {
105 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%.*s'\n"),
106 p_len, p);
107 ret++;
108 }
109 } else {
110 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%.*s'\n"),
111 p_len, p);
112 ret++;
113 }
114
115 p += p_len;
116
117 if (*p)
118 p++; /* more parameters, swallow separator */
119 }
120 return ret;
121 }
122
123 static int git_config_rename(const char *var, const char *value)
124 {
125 if (!value)
126 return DIFF_DETECT_RENAME;
127 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
128 return DIFF_DETECT_COPY;
129 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
130 }
131
132 /*
133 * These are to give UI layer defaults.
134 * The core-level commands such as git-diff-files should
135 * never be affected by the setting of diff.renames
136 * the user happens to have in the configuration file.
137 */
138 int git_diff_ui_config(const char *var, const char *value, void *cb)
139 {
140 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
141 diff_use_color_default = git_config_colorbool(var, value);
142 return 0;
143 }
144 if (!strcmp(var, "diff.renames")) {
145 diff_detect_rename_default = git_config_rename(var, value);
146 return 0;
147 }
148 if (!strcmp(var, "diff.autorefreshindex")) {
149 diff_auto_refresh_index = git_config_bool(var, value);
150 return 0;
151 }
152 if (!strcmp(var, "diff.mnemonicprefix")) {
153 diff_mnemonic_prefix = git_config_bool(var, value);
154 return 0;
155 }
156 if (!strcmp(var, "diff.noprefix")) {
157 diff_no_prefix = git_config_bool(var, value);
158 return 0;
159 }
160 if (!strcmp(var, "diff.statgraphwidth")) {
161 diff_stat_graph_width = git_config_int(var, value);
162 return 0;
163 }
164 if (!strcmp(var, "diff.external"))
165 return git_config_string(&external_diff_cmd_cfg, var, value);
166 if (!strcmp(var, "diff.wordregex"))
167 return git_config_string(&diff_word_regex_cfg, var, value);
168
169 if (!strcmp(var, "diff.ignoresubmodules"))
170 handle_ignore_submodules_arg(&default_diff_options, value);
171
172 if (git_color_config(var, value, cb) < 0)
173 return -1;
174
175 return git_diff_basic_config(var, value, cb);
176 }
177
178 int git_diff_basic_config(const char *var, const char *value, void *cb)
179 {
180 if (!strcmp(var, "diff.renamelimit")) {
181 diff_rename_limit_default = git_config_int(var, value);
182 return 0;
183 }
184
185 if (userdiff_config(var, value) < 0)
186 return -1;
187
188 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
189 int slot = parse_diff_color_slot(var, 11);
190 if (slot < 0)
191 return 0;
192 if (!value)
193 return config_error_nonbool(var);
194 color_parse(value, var, diff_colors[slot]);
195 return 0;
196 }
197
198 /* like GNU diff's --suppress-blank-empty option */
199 if (!strcmp(var, "diff.suppressblankempty") ||
200 /* for backwards compatibility */
201 !strcmp(var, "diff.suppress-blank-empty")) {
202 diff_suppress_blank_empty = git_config_bool(var, value);
203 return 0;
204 }
205
206 if (!strcmp(var, "diff.dirstat")) {
207 struct strbuf errmsg = STRBUF_INIT;
208 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
209 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
210 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
211 errmsg.buf);
212 strbuf_release(&errmsg);
213 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
214 return 0;
215 }
216
217 if (!prefixcmp(var, "submodule."))
218 return parse_submodule_config_option(var, value);
219
220 return git_default_config(var, value, cb);
221 }
222
223 static char *quote_two(const char *one, const char *two)
224 {
225 int need_one = quote_c_style(one, NULL, NULL, 1);
226 int need_two = quote_c_style(two, NULL, NULL, 1);
227 struct strbuf res = STRBUF_INIT;
228
229 if (need_one + need_two) {
230 strbuf_addch(&res, '"');
231 quote_c_style(one, &res, NULL, 1);
232 quote_c_style(two, &res, NULL, 1);
233 strbuf_addch(&res, '"');
234 } else {
235 strbuf_addstr(&res, one);
236 strbuf_addstr(&res, two);
237 }
238 return strbuf_detach(&res, NULL);
239 }
240
241 static const char *external_diff(void)
242 {
243 static const char *external_diff_cmd = NULL;
244 static int done_preparing = 0;
245
246 if (done_preparing)
247 return external_diff_cmd;
248 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
249 if (!external_diff_cmd)
250 external_diff_cmd = external_diff_cmd_cfg;
251 done_preparing = 1;
252 return external_diff_cmd;
253 }
254
255 static struct diff_tempfile {
256 const char *name; /* filename external diff should read from */
257 char hex[41];
258 char mode[10];
259 char tmp_path[PATH_MAX];
260 } diff_temp[2];
261
262 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
263
264 struct emit_callback {
265 int color_diff;
266 unsigned ws_rule;
267 int blank_at_eof_in_preimage;
268 int blank_at_eof_in_postimage;
269 int lno_in_preimage;
270 int lno_in_postimage;
271 sane_truncate_fn truncate;
272 const char **label_path;
273 struct diff_words_data *diff_words;
274 struct diff_options *opt;
275 int *found_changesp;
276 struct strbuf *header;
277 };
278
279 static int count_lines(const char *data, int size)
280 {
281 int count, ch, completely_empty = 1, nl_just_seen = 0;
282 count = 0;
283 while (0 < size--) {
284 ch = *data++;
285 if (ch == '\n') {
286 count++;
287 nl_just_seen = 1;
288 completely_empty = 0;
289 }
290 else {
291 nl_just_seen = 0;
292 completely_empty = 0;
293 }
294 }
295 if (completely_empty)
296 return 0;
297 if (!nl_just_seen)
298 count++; /* no trailing newline */
299 return count;
300 }
301
302 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
303 {
304 if (!DIFF_FILE_VALID(one)) {
305 mf->ptr = (char *)""; /* does not matter */
306 mf->size = 0;
307 return 0;
308 }
309 else if (diff_populate_filespec(one, 0))
310 return -1;
311
312 mf->ptr = one->data;
313 mf->size = one->size;
314 return 0;
315 }
316
317 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
318 static unsigned long diff_filespec_size(struct diff_filespec *one)
319 {
320 if (!DIFF_FILE_VALID(one))
321 return 0;
322 diff_populate_filespec(one, 1);
323 return one->size;
324 }
325
326 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
327 {
328 char *ptr = mf->ptr;
329 long size = mf->size;
330 int cnt = 0;
331
332 if (!size)
333 return cnt;
334 ptr += size - 1; /* pointing at the very end */
335 if (*ptr != '\n')
336 ; /* incomplete line */
337 else
338 ptr--; /* skip the last LF */
339 while (mf->ptr < ptr) {
340 char *prev_eol;
341 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
342 if (*prev_eol == '\n')
343 break;
344 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
345 break;
346 cnt++;
347 ptr = prev_eol - 1;
348 }
349 return cnt;
350 }
351
352 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
353 struct emit_callback *ecbdata)
354 {
355 int l1, l2, at;
356 unsigned ws_rule = ecbdata->ws_rule;
357 l1 = count_trailing_blank(mf1, ws_rule);
358 l2 = count_trailing_blank(mf2, ws_rule);
359 if (l2 <= l1) {
360 ecbdata->blank_at_eof_in_preimage = 0;
361 ecbdata->blank_at_eof_in_postimage = 0;
362 return;
363 }
364 at = count_lines(mf1->ptr, mf1->size);
365 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
366
367 at = count_lines(mf2->ptr, mf2->size);
368 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
369 }
370
371 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
372 int first, const char *line, int len)
373 {
374 int has_trailing_newline, has_trailing_carriage_return;
375 int nofirst;
376 FILE *file = o->file;
377
378 if (o->output_prefix) {
379 struct strbuf *msg = NULL;
380 msg = o->output_prefix(o, o->output_prefix_data);
381 assert(msg);
382 fwrite(msg->buf, msg->len, 1, file);
383 }
384
385 if (len == 0) {
386 has_trailing_newline = (first == '\n');
387 has_trailing_carriage_return = (!has_trailing_newline &&
388 (first == '\r'));
389 nofirst = has_trailing_newline || has_trailing_carriage_return;
390 } else {
391 has_trailing_newline = (len > 0 && line[len-1] == '\n');
392 if (has_trailing_newline)
393 len--;
394 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
395 if (has_trailing_carriage_return)
396 len--;
397 nofirst = 0;
398 }
399
400 if (len || !nofirst) {
401 fputs(set, file);
402 if (!nofirst)
403 fputc(first, file);
404 fwrite(line, len, 1, file);
405 fputs(reset, file);
406 }
407 if (has_trailing_carriage_return)
408 fputc('\r', file);
409 if (has_trailing_newline)
410 fputc('\n', file);
411 }
412
413 static void emit_line(struct diff_options *o, const char *set, const char *reset,
414 const char *line, int len)
415 {
416 emit_line_0(o, set, reset, line[0], line+1, len-1);
417 }
418
419 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
420 {
421 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
422 ecbdata->blank_at_eof_in_preimage &&
423 ecbdata->blank_at_eof_in_postimage &&
424 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
425 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
426 return 0;
427 return ws_blank_line(line, len, ecbdata->ws_rule);
428 }
429
430 static void emit_add_line(const char *reset,
431 struct emit_callback *ecbdata,
432 const char *line, int len)
433 {
434 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
435 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
436
437 if (!*ws)
438 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
439 else if (new_blank_line_at_eof(ecbdata, line, len))
440 /* Blank line at EOF - paint '+' as well */
441 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
442 else {
443 /* Emit just the prefix, then the rest. */
444 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
445 ws_check_emit(line, len, ecbdata->ws_rule,
446 ecbdata->opt->file, set, reset, ws);
447 }
448 }
449
450 static void emit_hunk_header(struct emit_callback *ecbdata,
451 const char *line, int len)
452 {
453 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
454 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
455 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
456 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
457 static const char atat[2] = { '@', '@' };
458 const char *cp, *ep;
459 struct strbuf msgbuf = STRBUF_INIT;
460 int org_len = len;
461 int i = 1;
462
463 /*
464 * As a hunk header must begin with "@@ -<old>, +<new> @@",
465 * it always is at least 10 bytes long.
466 */
467 if (len < 10 ||
468 memcmp(line, atat, 2) ||
469 !(ep = memmem(line + 2, len - 2, atat, 2))) {
470 emit_line(ecbdata->opt, plain, reset, line, len);
471 return;
472 }
473 ep += 2; /* skip over @@ */
474
475 /* The hunk header in fraginfo color */
476 strbuf_add(&msgbuf, frag, strlen(frag));
477 strbuf_add(&msgbuf, line, ep - line);
478 strbuf_add(&msgbuf, reset, strlen(reset));
479
480 /*
481 * trailing "\r\n"
482 */
483 for ( ; i < 3; i++)
484 if (line[len - i] == '\r' || line[len - i] == '\n')
485 len--;
486
487 /* blank before the func header */
488 for (cp = ep; ep - line < len; ep++)
489 if (*ep != ' ' && *ep != '\t')
490 break;
491 if (ep != cp) {
492 strbuf_add(&msgbuf, plain, strlen(plain));
493 strbuf_add(&msgbuf, cp, ep - cp);
494 strbuf_add(&msgbuf, reset, strlen(reset));
495 }
496
497 if (ep < line + len) {
498 strbuf_add(&msgbuf, func, strlen(func));
499 strbuf_add(&msgbuf, ep, line + len - ep);
500 strbuf_add(&msgbuf, reset, strlen(reset));
501 }
502
503 strbuf_add(&msgbuf, line + len, org_len - len);
504 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
505 strbuf_release(&msgbuf);
506 }
507
508 static struct diff_tempfile *claim_diff_tempfile(void) {
509 int i;
510 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
511 if (!diff_temp[i].name)
512 return diff_temp + i;
513 die("BUG: diff is failing to clean up its tempfiles");
514 }
515
516 static int remove_tempfile_installed;
517
518 static void remove_tempfile(void)
519 {
520 int i;
521 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
522 if (diff_temp[i].name == diff_temp[i].tmp_path)
523 unlink_or_warn(diff_temp[i].name);
524 diff_temp[i].name = NULL;
525 }
526 }
527
528 static void remove_tempfile_on_signal(int signo)
529 {
530 remove_tempfile();
531 sigchain_pop(signo);
532 raise(signo);
533 }
534
535 static void print_line_count(FILE *file, int count)
536 {
537 switch (count) {
538 case 0:
539 fprintf(file, "0,0");
540 break;
541 case 1:
542 fprintf(file, "1");
543 break;
544 default:
545 fprintf(file, "1,%d", count);
546 break;
547 }
548 }
549
550 static void emit_rewrite_lines(struct emit_callback *ecb,
551 int prefix, const char *data, int size)
552 {
553 const char *endp = NULL;
554 static const char *nneof = " No newline at end of file\n";
555 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
556 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
557
558 while (0 < size) {
559 int len;
560
561 endp = memchr(data, '\n', size);
562 len = endp ? (endp - data + 1) : size;
563 if (prefix != '+') {
564 ecb->lno_in_preimage++;
565 emit_line_0(ecb->opt, old, reset, '-',
566 data, len);
567 } else {
568 ecb->lno_in_postimage++;
569 emit_add_line(reset, ecb, data, len);
570 }
571 size -= len;
572 data += len;
573 }
574 if (!endp) {
575 const char *plain = diff_get_color(ecb->color_diff,
576 DIFF_PLAIN);
577 emit_line_0(ecb->opt, plain, reset, '\\',
578 nneof, strlen(nneof));
579 }
580 }
581
582 static void emit_rewrite_diff(const char *name_a,
583 const char *name_b,
584 struct diff_filespec *one,
585 struct diff_filespec *two,
586 struct userdiff_driver *textconv_one,
587 struct userdiff_driver *textconv_two,
588 struct diff_options *o)
589 {
590 int lc_a, lc_b;
591 const char *name_a_tab, *name_b_tab;
592 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
593 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
594 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
595 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
596 const char *a_prefix, *b_prefix;
597 char *data_one, *data_two;
598 size_t size_one, size_two;
599 struct emit_callback ecbdata;
600 char *line_prefix = "";
601 struct strbuf *msgbuf;
602
603 if (o && o->output_prefix) {
604 msgbuf = o->output_prefix(o, o->output_prefix_data);
605 line_prefix = msgbuf->buf;
606 }
607
608 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
609 a_prefix = o->b_prefix;
610 b_prefix = o->a_prefix;
611 } else {
612 a_prefix = o->a_prefix;
613 b_prefix = o->b_prefix;
614 }
615
616 name_a += (*name_a == '/');
617 name_b += (*name_b == '/');
618 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
619 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
620
621 strbuf_reset(&a_name);
622 strbuf_reset(&b_name);
623 quote_two_c_style(&a_name, a_prefix, name_a, 0);
624 quote_two_c_style(&b_name, b_prefix, name_b, 0);
625
626 size_one = fill_textconv(textconv_one, one, &data_one);
627 size_two = fill_textconv(textconv_two, two, &data_two);
628
629 memset(&ecbdata, 0, sizeof(ecbdata));
630 ecbdata.color_diff = want_color(o->use_color);
631 ecbdata.found_changesp = &o->found_changes;
632 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
633 ecbdata.opt = o;
634 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
635 mmfile_t mf1, mf2;
636 mf1.ptr = (char *)data_one;
637 mf2.ptr = (char *)data_two;
638 mf1.size = size_one;
639 mf2.size = size_two;
640 check_blank_at_eof(&mf1, &mf2, &ecbdata);
641 }
642 ecbdata.lno_in_preimage = 1;
643 ecbdata.lno_in_postimage = 1;
644
645 lc_a = count_lines(data_one, size_one);
646 lc_b = count_lines(data_two, size_two);
647 fprintf(o->file,
648 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
649 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
650 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
651 line_prefix, fraginfo);
652 if (!o->irreversible_delete)
653 print_line_count(o->file, lc_a);
654 else
655 fprintf(o->file, "?,?");
656 fprintf(o->file, " +");
657 print_line_count(o->file, lc_b);
658 fprintf(o->file, " @@%s\n", reset);
659 if (lc_a && !o->irreversible_delete)
660 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
661 if (lc_b)
662 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
663 if (textconv_one)
664 free((char *)data_one);
665 if (textconv_two)
666 free((char *)data_two);
667 }
668
669 struct diff_words_buffer {
670 mmfile_t text;
671 long alloc;
672 struct diff_words_orig {
673 const char *begin, *end;
674 } *orig;
675 int orig_nr, orig_alloc;
676 };
677
678 static void diff_words_append(char *line, unsigned long len,
679 struct diff_words_buffer *buffer)
680 {
681 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
682 line++;
683 len--;
684 memcpy(buffer->text.ptr + buffer->text.size, line, len);
685 buffer->text.size += len;
686 buffer->text.ptr[buffer->text.size] = '\0';
687 }
688
689 struct diff_words_style_elem {
690 const char *prefix;
691 const char *suffix;
692 const char *color; /* NULL; filled in by the setup code if
693 * color is enabled */
694 };
695
696 struct diff_words_style {
697 enum diff_words_type type;
698 struct diff_words_style_elem new, old, ctx;
699 const char *newline;
700 };
701
702 static struct diff_words_style diff_words_styles[] = {
703 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
704 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
705 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
706 };
707
708 struct diff_words_data {
709 struct diff_words_buffer minus, plus;
710 const char *current_plus;
711 int last_minus;
712 struct diff_options *opt;
713 regex_t *word_regex;
714 enum diff_words_type type;
715 struct diff_words_style *style;
716 };
717
718 static int fn_out_diff_words_write_helper(FILE *fp,
719 struct diff_words_style_elem *st_el,
720 const char *newline,
721 size_t count, const char *buf,
722 const char *line_prefix)
723 {
724 int print = 0;
725
726 while (count) {
727 char *p = memchr(buf, '\n', count);
728 if (print)
729 fputs(line_prefix, fp);
730 if (p != buf) {
731 if (st_el->color && fputs(st_el->color, fp) < 0)
732 return -1;
733 if (fputs(st_el->prefix, fp) < 0 ||
734 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
735 fputs(st_el->suffix, fp) < 0)
736 return -1;
737 if (st_el->color && *st_el->color
738 && fputs(GIT_COLOR_RESET, fp) < 0)
739 return -1;
740 }
741 if (!p)
742 return 0;
743 if (fputs(newline, fp) < 0)
744 return -1;
745 count -= p + 1 - buf;
746 buf = p + 1;
747 print = 1;
748 }
749 return 0;
750 }
751
752 /*
753 * '--color-words' algorithm can be described as:
754 *
755 * 1. collect a the minus/plus lines of a diff hunk, divided into
756 * minus-lines and plus-lines;
757 *
758 * 2. break both minus-lines and plus-lines into words and
759 * place them into two mmfile_t with one word for each line;
760 *
761 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
762 *
763 * And for the common parts of the both file, we output the plus side text.
764 * diff_words->current_plus is used to trace the current position of the plus file
765 * which printed. diff_words->last_minus is used to trace the last minus word
766 * printed.
767 *
768 * For '--graph' to work with '--color-words', we need to output the graph prefix
769 * on each line of color words output. Generally, there are two conditions on
770 * which we should output the prefix.
771 *
772 * 1. diff_words->last_minus == 0 &&
773 * diff_words->current_plus == diff_words->plus.text.ptr
774 *
775 * that is: the plus text must start as a new line, and if there is no minus
776 * word printed, a graph prefix must be printed.
777 *
778 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
779 * *(diff_words->current_plus - 1) == '\n'
780 *
781 * that is: a graph prefix must be printed following a '\n'
782 */
783 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
784 {
785 if ((diff_words->last_minus == 0 &&
786 diff_words->current_plus == diff_words->plus.text.ptr) ||
787 (diff_words->current_plus > diff_words->plus.text.ptr &&
788 *(diff_words->current_plus - 1) == '\n')) {
789 return 1;
790 } else {
791 return 0;
792 }
793 }
794
795 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
796 {
797 struct diff_words_data *diff_words = priv;
798 struct diff_words_style *style = diff_words->style;
799 int minus_first, minus_len, plus_first, plus_len;
800 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
801 struct diff_options *opt = diff_words->opt;
802 struct strbuf *msgbuf;
803 char *line_prefix = "";
804
805 if (line[0] != '@' || parse_hunk_header(line, len,
806 &minus_first, &minus_len, &plus_first, &plus_len))
807 return;
808
809 assert(opt);
810 if (opt->output_prefix) {
811 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
812 line_prefix = msgbuf->buf;
813 }
814
815 /* POSIX requires that first be decremented by one if len == 0... */
816 if (minus_len) {
817 minus_begin = diff_words->minus.orig[minus_first].begin;
818 minus_end =
819 diff_words->minus.orig[minus_first + minus_len - 1].end;
820 } else
821 minus_begin = minus_end =
822 diff_words->minus.orig[minus_first].end;
823
824 if (plus_len) {
825 plus_begin = diff_words->plus.orig[plus_first].begin;
826 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
827 } else
828 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
829
830 if (color_words_output_graph_prefix(diff_words)) {
831 fputs(line_prefix, diff_words->opt->file);
832 }
833 if (diff_words->current_plus != plus_begin) {
834 fn_out_diff_words_write_helper(diff_words->opt->file,
835 &style->ctx, style->newline,
836 plus_begin - diff_words->current_plus,
837 diff_words->current_plus, line_prefix);
838 if (*(plus_begin - 1) == '\n')
839 fputs(line_prefix, diff_words->opt->file);
840 }
841 if (minus_begin != minus_end) {
842 fn_out_diff_words_write_helper(diff_words->opt->file,
843 &style->old, style->newline,
844 minus_end - minus_begin, minus_begin,
845 line_prefix);
846 }
847 if (plus_begin != plus_end) {
848 fn_out_diff_words_write_helper(diff_words->opt->file,
849 &style->new, style->newline,
850 plus_end - plus_begin, plus_begin,
851 line_prefix);
852 }
853
854 diff_words->current_plus = plus_end;
855 diff_words->last_minus = minus_first;
856 }
857
858 /* This function starts looking at *begin, and returns 0 iff a word was found. */
859 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
860 int *begin, int *end)
861 {
862 if (word_regex && *begin < buffer->size) {
863 regmatch_t match[1];
864 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
865 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
866 '\n', match[0].rm_eo - match[0].rm_so);
867 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
868 *begin += match[0].rm_so;
869 return *begin >= *end;
870 }
871 return -1;
872 }
873
874 /* find the next word */
875 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
876 (*begin)++;
877 if (*begin >= buffer->size)
878 return -1;
879
880 /* find the end of the word */
881 *end = *begin + 1;
882 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
883 (*end)++;
884
885 return 0;
886 }
887
888 /*
889 * This function splits the words in buffer->text, stores the list with
890 * newline separator into out, and saves the offsets of the original words
891 * in buffer->orig.
892 */
893 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
894 regex_t *word_regex)
895 {
896 int i, j;
897 long alloc = 0;
898
899 out->size = 0;
900 out->ptr = NULL;
901
902 /* fake an empty "0th" word */
903 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
904 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
905 buffer->orig_nr = 1;
906
907 for (i = 0; i < buffer->text.size; i++) {
908 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
909 return;
910
911 /* store original boundaries */
912 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
913 buffer->orig_alloc);
914 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
915 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
916 buffer->orig_nr++;
917
918 /* store one word */
919 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
920 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
921 out->ptr[out->size + j - i] = '\n';
922 out->size += j - i + 1;
923
924 i = j - 1;
925 }
926 }
927
928 /* this executes the word diff on the accumulated buffers */
929 static void diff_words_show(struct diff_words_data *diff_words)
930 {
931 xpparam_t xpp;
932 xdemitconf_t xecfg;
933 mmfile_t minus, plus;
934 struct diff_words_style *style = diff_words->style;
935
936 struct diff_options *opt = diff_words->opt;
937 struct strbuf *msgbuf;
938 char *line_prefix = "";
939
940 assert(opt);
941 if (opt->output_prefix) {
942 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
943 line_prefix = msgbuf->buf;
944 }
945
946 /* special case: only removal */
947 if (!diff_words->plus.text.size) {
948 fputs(line_prefix, diff_words->opt->file);
949 fn_out_diff_words_write_helper(diff_words->opt->file,
950 &style->old, style->newline,
951 diff_words->minus.text.size,
952 diff_words->minus.text.ptr, line_prefix);
953 diff_words->minus.text.size = 0;
954 return;
955 }
956
957 diff_words->current_plus = diff_words->plus.text.ptr;
958 diff_words->last_minus = 0;
959
960 memset(&xpp, 0, sizeof(xpp));
961 memset(&xecfg, 0, sizeof(xecfg));
962 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
963 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
964 xpp.flags = 0;
965 /* as only the hunk header will be parsed, we need a 0-context */
966 xecfg.ctxlen = 0;
967 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
968 &xpp, &xecfg);
969 free(minus.ptr);
970 free(plus.ptr);
971 if (diff_words->current_plus != diff_words->plus.text.ptr +
972 diff_words->plus.text.size) {
973 if (color_words_output_graph_prefix(diff_words))
974 fputs(line_prefix, diff_words->opt->file);
975 fn_out_diff_words_write_helper(diff_words->opt->file,
976 &style->ctx, style->newline,
977 diff_words->plus.text.ptr + diff_words->plus.text.size
978 - diff_words->current_plus, diff_words->current_plus,
979 line_prefix);
980 }
981 diff_words->minus.text.size = diff_words->plus.text.size = 0;
982 }
983
984 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
985 static void diff_words_flush(struct emit_callback *ecbdata)
986 {
987 if (ecbdata->diff_words->minus.text.size ||
988 ecbdata->diff_words->plus.text.size)
989 diff_words_show(ecbdata->diff_words);
990 }
991
992 static void diff_filespec_load_driver(struct diff_filespec *one)
993 {
994 /* Use already-loaded driver */
995 if (one->driver)
996 return;
997
998 if (S_ISREG(one->mode))
999 one->driver = userdiff_find_by_path(one->path);
1000
1001 /* Fallback to default settings */
1002 if (!one->driver)
1003 one->driver = userdiff_find_by_name("default");
1004 }
1005
1006 static const char *userdiff_word_regex(struct diff_filespec *one)
1007 {
1008 diff_filespec_load_driver(one);
1009 return one->driver->word_regex;
1010 }
1011
1012 static void init_diff_words_data(struct emit_callback *ecbdata,
1013 struct diff_options *orig_opts,
1014 struct diff_filespec *one,
1015 struct diff_filespec *two)
1016 {
1017 int i;
1018 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1019 memcpy(o, orig_opts, sizeof(struct diff_options));
1020
1021 ecbdata->diff_words =
1022 xcalloc(1, sizeof(struct diff_words_data));
1023 ecbdata->diff_words->type = o->word_diff;
1024 ecbdata->diff_words->opt = o;
1025 if (!o->word_regex)
1026 o->word_regex = userdiff_word_regex(one);
1027 if (!o->word_regex)
1028 o->word_regex = userdiff_word_regex(two);
1029 if (!o->word_regex)
1030 o->word_regex = diff_word_regex_cfg;
1031 if (o->word_regex) {
1032 ecbdata->diff_words->word_regex = (regex_t *)
1033 xmalloc(sizeof(regex_t));
1034 if (regcomp(ecbdata->diff_words->word_regex,
1035 o->word_regex,
1036 REG_EXTENDED | REG_NEWLINE))
1037 die ("Invalid regular expression: %s",
1038 o->word_regex);
1039 }
1040 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1041 if (o->word_diff == diff_words_styles[i].type) {
1042 ecbdata->diff_words->style =
1043 &diff_words_styles[i];
1044 break;
1045 }
1046 }
1047 if (want_color(o->use_color)) {
1048 struct diff_words_style *st = ecbdata->diff_words->style;
1049 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1050 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1051 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1052 }
1053 }
1054
1055 static void free_diff_words_data(struct emit_callback *ecbdata)
1056 {
1057 if (ecbdata->diff_words) {
1058 diff_words_flush(ecbdata);
1059 free (ecbdata->diff_words->opt);
1060 free (ecbdata->diff_words->minus.text.ptr);
1061 free (ecbdata->diff_words->minus.orig);
1062 free (ecbdata->diff_words->plus.text.ptr);
1063 free (ecbdata->diff_words->plus.orig);
1064 if (ecbdata->diff_words->word_regex) {
1065 regfree(ecbdata->diff_words->word_regex);
1066 free(ecbdata->diff_words->word_regex);
1067 }
1068 free(ecbdata->diff_words);
1069 ecbdata->diff_words = NULL;
1070 }
1071 }
1072
1073 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1074 {
1075 if (want_color(diff_use_color))
1076 return diff_colors[ix];
1077 return "";
1078 }
1079
1080 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1081 {
1082 const char *cp;
1083 unsigned long allot;
1084 size_t l = len;
1085
1086 if (ecb->truncate)
1087 return ecb->truncate(line, len);
1088 cp = line;
1089 allot = l;
1090 while (0 < l) {
1091 (void) utf8_width(&cp, &l);
1092 if (!cp)
1093 break; /* truncated in the middle? */
1094 }
1095 return allot - l;
1096 }
1097
1098 static void find_lno(const char *line, struct emit_callback *ecbdata)
1099 {
1100 const char *p;
1101 ecbdata->lno_in_preimage = 0;
1102 ecbdata->lno_in_postimage = 0;
1103 p = strchr(line, '-');
1104 if (!p)
1105 return; /* cannot happen */
1106 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1107 p = strchr(p, '+');
1108 if (!p)
1109 return; /* cannot happen */
1110 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1111 }
1112
1113 static void fn_out_consume(void *priv, char *line, unsigned long len)
1114 {
1115 struct emit_callback *ecbdata = priv;
1116 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1117 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1118 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1119 struct diff_options *o = ecbdata->opt;
1120 char *line_prefix = "";
1121 struct strbuf *msgbuf;
1122
1123 if (o && o->output_prefix) {
1124 msgbuf = o->output_prefix(o, o->output_prefix_data);
1125 line_prefix = msgbuf->buf;
1126 }
1127
1128 if (ecbdata->header) {
1129 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1130 strbuf_reset(ecbdata->header);
1131 ecbdata->header = NULL;
1132 }
1133 *(ecbdata->found_changesp) = 1;
1134
1135 if (ecbdata->label_path[0]) {
1136 const char *name_a_tab, *name_b_tab;
1137
1138 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1139 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1140
1141 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1142 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1143 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1144 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1145 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1146 }
1147
1148 if (diff_suppress_blank_empty
1149 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1150 line[0] = '\n';
1151 len = 1;
1152 }
1153
1154 if (line[0] == '@') {
1155 if (ecbdata->diff_words)
1156 diff_words_flush(ecbdata);
1157 len = sane_truncate_line(ecbdata, line, len);
1158 find_lno(line, ecbdata);
1159 emit_hunk_header(ecbdata, line, len);
1160 if (line[len-1] != '\n')
1161 putc('\n', ecbdata->opt->file);
1162 return;
1163 }
1164
1165 if (len < 1) {
1166 emit_line(ecbdata->opt, reset, reset, line, len);
1167 if (ecbdata->diff_words
1168 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1169 fputs("~\n", ecbdata->opt->file);
1170 return;
1171 }
1172
1173 if (ecbdata->diff_words) {
1174 if (line[0] == '-') {
1175 diff_words_append(line, len,
1176 &ecbdata->diff_words->minus);
1177 return;
1178 } else if (line[0] == '+') {
1179 diff_words_append(line, len,
1180 &ecbdata->diff_words->plus);
1181 return;
1182 } else if (!prefixcmp(line, "\\ ")) {
1183 /*
1184 * Eat the "no newline at eof" marker as if we
1185 * saw a "+" or "-" line with nothing on it,
1186 * and return without diff_words_flush() to
1187 * defer processing. If this is the end of
1188 * preimage, more "+" lines may come after it.
1189 */
1190 return;
1191 }
1192 diff_words_flush(ecbdata);
1193 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1194 emit_line(ecbdata->opt, plain, reset, line, len);
1195 fputs("~\n", ecbdata->opt->file);
1196 } else {
1197 /*
1198 * Skip the prefix character, if any. With
1199 * diff_suppress_blank_empty, there may be
1200 * none.
1201 */
1202 if (line[0] != '\n') {
1203 line++;
1204 len--;
1205 }
1206 emit_line(ecbdata->opt, plain, reset, line, len);
1207 }
1208 return;
1209 }
1210
1211 if (line[0] != '+') {
1212 const char *color =
1213 diff_get_color(ecbdata->color_diff,
1214 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1215 ecbdata->lno_in_preimage++;
1216 if (line[0] == ' ')
1217 ecbdata->lno_in_postimage++;
1218 emit_line(ecbdata->opt, color, reset, line, len);
1219 } else {
1220 ecbdata->lno_in_postimage++;
1221 emit_add_line(reset, ecbdata, line + 1, len - 1);
1222 }
1223 }
1224
1225 static char *pprint_rename(const char *a, const char *b)
1226 {
1227 const char *old = a;
1228 const char *new = b;
1229 struct strbuf name = STRBUF_INIT;
1230 int pfx_length, sfx_length;
1231 int len_a = strlen(a);
1232 int len_b = strlen(b);
1233 int a_midlen, b_midlen;
1234 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1235 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1236
1237 if (qlen_a || qlen_b) {
1238 quote_c_style(a, &name, NULL, 0);
1239 strbuf_addstr(&name, " => ");
1240 quote_c_style(b, &name, NULL, 0);
1241 return strbuf_detach(&name, NULL);
1242 }
1243
1244 /* Find common prefix */
1245 pfx_length = 0;
1246 while (*old && *new && *old == *new) {
1247 if (*old == '/')
1248 pfx_length = old - a + 1;
1249 old++;
1250 new++;
1251 }
1252
1253 /* Find common suffix */
1254 old = a + len_a;
1255 new = b + len_b;
1256 sfx_length = 0;
1257 while (a <= old && b <= new && *old == *new) {
1258 if (*old == '/')
1259 sfx_length = len_a - (old - a);
1260 old--;
1261 new--;
1262 }
1263
1264 /*
1265 * pfx{mid-a => mid-b}sfx
1266 * {pfx-a => pfx-b}sfx
1267 * pfx{sfx-a => sfx-b}
1268 * name-a => name-b
1269 */
1270 a_midlen = len_a - pfx_length - sfx_length;
1271 b_midlen = len_b - pfx_length - sfx_length;
1272 if (a_midlen < 0)
1273 a_midlen = 0;
1274 if (b_midlen < 0)
1275 b_midlen = 0;
1276
1277 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1278 if (pfx_length + sfx_length) {
1279 strbuf_add(&name, a, pfx_length);
1280 strbuf_addch(&name, '{');
1281 }
1282 strbuf_add(&name, a + pfx_length, a_midlen);
1283 strbuf_addstr(&name, " => ");
1284 strbuf_add(&name, b + pfx_length, b_midlen);
1285 if (pfx_length + sfx_length) {
1286 strbuf_addch(&name, '}');
1287 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1288 }
1289 return strbuf_detach(&name, NULL);
1290 }
1291
1292 struct diffstat_t {
1293 int nr;
1294 int alloc;
1295 struct diffstat_file {
1296 char *from_name;
1297 char *name;
1298 char *print_name;
1299 unsigned is_unmerged:1;
1300 unsigned is_binary:1;
1301 unsigned is_renamed:1;
1302 uintmax_t added, deleted;
1303 } **files;
1304 };
1305
1306 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1307 const char *name_a,
1308 const char *name_b)
1309 {
1310 struct diffstat_file *x;
1311 x = xcalloc(sizeof (*x), 1);
1312 if (diffstat->nr == diffstat->alloc) {
1313 diffstat->alloc = alloc_nr(diffstat->alloc);
1314 diffstat->files = xrealloc(diffstat->files,
1315 diffstat->alloc * sizeof(x));
1316 }
1317 diffstat->files[diffstat->nr++] = x;
1318 if (name_b) {
1319 x->from_name = xstrdup(name_a);
1320 x->name = xstrdup(name_b);
1321 x->is_renamed = 1;
1322 }
1323 else {
1324 x->from_name = NULL;
1325 x->name = xstrdup(name_a);
1326 }
1327 return x;
1328 }
1329
1330 static void diffstat_consume(void *priv, char *line, unsigned long len)
1331 {
1332 struct diffstat_t *diffstat = priv;
1333 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1334
1335 if (line[0] == '+')
1336 x->added++;
1337 else if (line[0] == '-')
1338 x->deleted++;
1339 }
1340
1341 const char mime_boundary_leader[] = "------------";
1342
1343 static int scale_linear(int it, int width, int max_change)
1344 {
1345 if (!it)
1346 return 0;
1347 /*
1348 * make sure that at least one '-' or '+' is printed if
1349 * there is any change to this path. The easiest way is to
1350 * scale linearly as if the alloted width is one column shorter
1351 * than it is, and then add 1 to the result.
1352 */
1353 return 1 + (it * (width - 1) / max_change);
1354 }
1355
1356 static void show_name(FILE *file,
1357 const char *prefix, const char *name, int len)
1358 {
1359 fprintf(file, " %s%-*s |", prefix, len, name);
1360 }
1361
1362 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1363 {
1364 if (cnt <= 0)
1365 return;
1366 fprintf(file, "%s", set);
1367 while (cnt--)
1368 putc(ch, file);
1369 fprintf(file, "%s", reset);
1370 }
1371
1372 static void fill_print_name(struct diffstat_file *file)
1373 {
1374 char *pname;
1375
1376 if (file->print_name)
1377 return;
1378
1379 if (!file->is_renamed) {
1380 struct strbuf buf = STRBUF_INIT;
1381 if (quote_c_style(file->name, &buf, NULL, 0)) {
1382 pname = strbuf_detach(&buf, NULL);
1383 } else {
1384 pname = file->name;
1385 strbuf_release(&buf);
1386 }
1387 } else {
1388 pname = pprint_rename(file->from_name, file->name);
1389 }
1390 file->print_name = pname;
1391 }
1392
1393 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1394 {
1395 struct strbuf sb = STRBUF_INIT;
1396 int ret;
1397
1398 if (!files) {
1399 assert(insertions == 0 && deletions == 0);
1400 return fputs(_(" 0 files changed\n"), fp);
1401 }
1402
1403 strbuf_addf(&sb,
1404 Q_(" %d file changed", " %d files changed", files),
1405 files);
1406
1407 /*
1408 * For binary diff, the caller may want to print "x files
1409 * changed" with insertions == 0 && deletions == 0.
1410 *
1411 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1412 * is probably less confusing (i.e skip over "2 files changed
1413 * but nothing about added/removed lines? Is this a bug in Git?").
1414 */
1415 if (insertions || deletions == 0) {
1416 /*
1417 * TRANSLATORS: "+" in (+) is a line addition marker;
1418 * do not translate it.
1419 */
1420 strbuf_addf(&sb,
1421 Q_(", %d insertion(+)", ", %d insertions(+)",
1422 insertions),
1423 insertions);
1424 }
1425
1426 if (deletions || insertions == 0) {
1427 /*
1428 * TRANSLATORS: "-" in (-) is a line removal marker;
1429 * do not translate it.
1430 */
1431 strbuf_addf(&sb,
1432 Q_(", %d deletion(-)", ", %d deletions(-)",
1433 deletions),
1434 deletions);
1435 }
1436 strbuf_addch(&sb, '\n');
1437 ret = fputs(sb.buf, fp);
1438 strbuf_release(&sb);
1439 return ret;
1440 }
1441
1442 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1443 {
1444 int i, len, add, del, adds = 0, dels = 0;
1445 uintmax_t max_change = 0, max_len = 0;
1446 int total_files = data->nr;
1447 int width, name_width, graph_width, number_width = 4, count;
1448 const char *reset, *add_c, *del_c;
1449 const char *line_prefix = "";
1450 int extra_shown = 0;
1451 struct strbuf *msg = NULL;
1452
1453 if (data->nr == 0)
1454 return;
1455
1456 if (options->output_prefix) {
1457 msg = options->output_prefix(options, options->output_prefix_data);
1458 line_prefix = msg->buf;
1459 }
1460
1461 count = options->stat_count ? options->stat_count : data->nr;
1462
1463 reset = diff_get_color_opt(options, DIFF_RESET);
1464 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1465 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1466
1467 /*
1468 * Find the longest filename and max number of changes
1469 */
1470 for (i = 0; (i < count) && (i < data->nr); i++) {
1471 struct diffstat_file *file = data->files[i];
1472 uintmax_t change = file->added + file->deleted;
1473 if (!data->files[i]->is_renamed &&
1474 (change == 0)) {
1475 count++; /* not shown == room for one more */
1476 continue;
1477 }
1478 fill_print_name(file);
1479 len = strlen(file->print_name);
1480 if (max_len < len)
1481 max_len = len;
1482
1483 if (file->is_binary || file->is_unmerged)
1484 continue;
1485 if (max_change < change)
1486 max_change = change;
1487 }
1488 count = i; /* min(count, data->nr) */
1489
1490 /*
1491 * We have width = stat_width or term_columns() columns total.
1492 * We want a maximum of min(max_len, stat_name_width) for the name part.
1493 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1494 * We also need 1 for " " and 4 + decimal_width(max_change)
1495 * for " | NNNN " and one the empty column at the end, altogether
1496 * 6 + decimal_width(max_change).
1497 *
1498 * If there's not enough space, we will use the smaller of
1499 * stat_name_width (if set) and 5/8*width for the filename,
1500 * and the rest for constant elements + graph part, but no more
1501 * than stat_graph_width for the graph part.
1502 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1503 * for the standard terminal size).
1504 *
1505 * In other words: stat_width limits the maximum width, and
1506 * stat_name_width fixes the maximum width of the filename,
1507 * and is also used to divide available columns if there
1508 * aren't enough.
1509 */
1510
1511 if (options->stat_width == -1)
1512 width = term_columns() - options->output_prefix_length;
1513 else
1514 width = options->stat_width ? options->stat_width : 80;
1515
1516 if (options->stat_graph_width == -1)
1517 options->stat_graph_width = diff_stat_graph_width;
1518
1519 /*
1520 * Guarantee 3/8*16==6 for the graph part
1521 * and 5/8*16==10 for the filename part
1522 */
1523 if (width < 16 + 6 + number_width)
1524 width = 16 + 6 + number_width;
1525
1526 /*
1527 * First assign sizes that are wanted, ignoring available width.
1528 */
1529 graph_width = (options->stat_graph_width &&
1530 options->stat_graph_width < max_change) ?
1531 options->stat_graph_width : max_change;
1532 name_width = (options->stat_name_width > 0 &&
1533 options->stat_name_width < max_len) ?
1534 options->stat_name_width : max_len;
1535
1536 /*
1537 * Adjust adjustable widths not to exceed maximum width
1538 */
1539 if (name_width + number_width + 6 + graph_width > width) {
1540 if (graph_width > width * 3/8 - number_width - 6) {
1541 graph_width = width * 3/8 - number_width - 6;
1542 if (graph_width < 6)
1543 graph_width = 6;
1544 }
1545
1546 if (options->stat_graph_width &&
1547 graph_width > options->stat_graph_width)
1548 graph_width = options->stat_graph_width;
1549 if (name_width > width - number_width - 6 - graph_width)
1550 name_width = width - number_width - 6 - graph_width;
1551 else
1552 graph_width = width - number_width - 6 - name_width;
1553 }
1554
1555 /*
1556 * From here name_width is the width of the name area,
1557 * and graph_width is the width of the graph area.
1558 * max_change is used to scale graph properly.
1559 */
1560 for (i = 0; i < count; i++) {
1561 const char *prefix = "";
1562 char *name = data->files[i]->print_name;
1563 uintmax_t added = data->files[i]->added;
1564 uintmax_t deleted = data->files[i]->deleted;
1565 int name_len;
1566
1567 if (!data->files[i]->is_renamed &&
1568 (added + deleted == 0)) {
1569 total_files--;
1570 continue;
1571 }
1572 /*
1573 * "scale" the filename
1574 */
1575 len = name_width;
1576 name_len = strlen(name);
1577 if (name_width < name_len) {
1578 char *slash;
1579 prefix = "...";
1580 len -= 3;
1581 name += name_len - len;
1582 slash = strchr(name, '/');
1583 if (slash)
1584 name = slash;
1585 }
1586
1587 if (data->files[i]->is_binary) {
1588 fprintf(options->file, "%s", line_prefix);
1589 show_name(options->file, prefix, name, len);
1590 fprintf(options->file, " Bin ");
1591 fprintf(options->file, "%s%"PRIuMAX"%s",
1592 del_c, deleted, reset);
1593 fprintf(options->file, " -> ");
1594 fprintf(options->file, "%s%"PRIuMAX"%s",
1595 add_c, added, reset);
1596 fprintf(options->file, " bytes");
1597 fprintf(options->file, "\n");
1598 continue;
1599 }
1600 else if (data->files[i]->is_unmerged) {
1601 fprintf(options->file, "%s", line_prefix);
1602 show_name(options->file, prefix, name, len);
1603 fprintf(options->file, " Unmerged\n");
1604 continue;
1605 }
1606
1607 /*
1608 * scale the add/delete
1609 */
1610 add = added;
1611 del = deleted;
1612 adds += add;
1613 dels += del;
1614
1615 if (graph_width <= max_change) {
1616 int total = add + del;
1617
1618 total = scale_linear(add + del, graph_width, max_change);
1619 if (total < 2 && add && del)
1620 /* width >= 2 due to the sanity check */
1621 total = 2;
1622 if (add < del) {
1623 add = scale_linear(add, graph_width, max_change);
1624 del = total - add;
1625 } else {
1626 del = scale_linear(del, graph_width, max_change);
1627 add = total - del;
1628 }
1629 }
1630 fprintf(options->file, "%s", line_prefix);
1631 show_name(options->file, prefix, name, len);
1632 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1633 added + deleted ? " " : "");
1634 show_graph(options->file, '+', add, add_c, reset);
1635 show_graph(options->file, '-', del, del_c, reset);
1636 fprintf(options->file, "\n");
1637 }
1638 for (i = count; i < data->nr; i++) {
1639 uintmax_t added = data->files[i]->added;
1640 uintmax_t deleted = data->files[i]->deleted;
1641 if (!data->files[i]->is_renamed &&
1642 (added + deleted == 0)) {
1643 total_files--;
1644 continue;
1645 }
1646 adds += added;
1647 dels += deleted;
1648 if (!extra_shown)
1649 fprintf(options->file, "%s ...\n", line_prefix);
1650 extra_shown = 1;
1651 }
1652 fprintf(options->file, "%s", line_prefix);
1653 print_stat_summary(options->file, total_files, adds, dels);
1654 }
1655
1656 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1657 {
1658 int i, adds = 0, dels = 0, total_files = data->nr;
1659
1660 if (data->nr == 0)
1661 return;
1662
1663 for (i = 0; i < data->nr; i++) {
1664 if (!data->files[i]->is_binary &&
1665 !data->files[i]->is_unmerged) {
1666 int added = data->files[i]->added;
1667 int deleted= data->files[i]->deleted;
1668 if (!data->files[i]->is_renamed &&
1669 (added + deleted == 0)) {
1670 total_files--;
1671 } else {
1672 adds += added;
1673 dels += deleted;
1674 }
1675 }
1676 }
1677 if (options->output_prefix) {
1678 struct strbuf *msg = NULL;
1679 msg = options->output_prefix(options,
1680 options->output_prefix_data);
1681 fprintf(options->file, "%s", msg->buf);
1682 }
1683 print_stat_summary(options->file, total_files, adds, dels);
1684 }
1685
1686 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1687 {
1688 int i;
1689
1690 if (data->nr == 0)
1691 return;
1692
1693 for (i = 0; i < data->nr; i++) {
1694 struct diffstat_file *file = data->files[i];
1695
1696 if (options->output_prefix) {
1697 struct strbuf *msg = NULL;
1698 msg = options->output_prefix(options,
1699 options->output_prefix_data);
1700 fprintf(options->file, "%s", msg->buf);
1701 }
1702
1703 if (file->is_binary)
1704 fprintf(options->file, "-\t-\t");
1705 else
1706 fprintf(options->file,
1707 "%"PRIuMAX"\t%"PRIuMAX"\t",
1708 file->added, file->deleted);
1709 if (options->line_termination) {
1710 fill_print_name(file);
1711 if (!file->is_renamed)
1712 write_name_quoted(file->name, options->file,
1713 options->line_termination);
1714 else {
1715 fputs(file->print_name, options->file);
1716 putc(options->line_termination, options->file);
1717 }
1718 } else {
1719 if (file->is_renamed) {
1720 putc('\0', options->file);
1721 write_name_quoted(file->from_name, options->file, '\0');
1722 }
1723 write_name_quoted(file->name, options->file, '\0');
1724 }
1725 }
1726 }
1727
1728 struct dirstat_file {
1729 const char *name;
1730 unsigned long changed;
1731 };
1732
1733 struct dirstat_dir {
1734 struct dirstat_file *files;
1735 int alloc, nr, permille, cumulative;
1736 };
1737
1738 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1739 unsigned long changed, const char *base, int baselen)
1740 {
1741 unsigned long this_dir = 0;
1742 unsigned int sources = 0;
1743 const char *line_prefix = "";
1744 struct strbuf *msg = NULL;
1745
1746 if (opt->output_prefix) {
1747 msg = opt->output_prefix(opt, opt->output_prefix_data);
1748 line_prefix = msg->buf;
1749 }
1750
1751 while (dir->nr) {
1752 struct dirstat_file *f = dir->files;
1753 int namelen = strlen(f->name);
1754 unsigned long this;
1755 char *slash;
1756
1757 if (namelen < baselen)
1758 break;
1759 if (memcmp(f->name, base, baselen))
1760 break;
1761 slash = strchr(f->name + baselen, '/');
1762 if (slash) {
1763 int newbaselen = slash + 1 - f->name;
1764 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1765 sources++;
1766 } else {
1767 this = f->changed;
1768 dir->files++;
1769 dir->nr--;
1770 sources += 2;
1771 }
1772 this_dir += this;
1773 }
1774
1775 /*
1776 * We don't report dirstat's for
1777 * - the top level
1778 * - or cases where everything came from a single directory
1779 * under this directory (sources == 1).
1780 */
1781 if (baselen && sources != 1) {
1782 if (this_dir) {
1783 int permille = this_dir * 1000 / changed;
1784 if (permille >= dir->permille) {
1785 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1786 permille / 10, permille % 10, baselen, base);
1787 if (!dir->cumulative)
1788 return 0;
1789 }
1790 }
1791 }
1792 return this_dir;
1793 }
1794
1795 static int dirstat_compare(const void *_a, const void *_b)
1796 {
1797 const struct dirstat_file *a = _a;
1798 const struct dirstat_file *b = _b;
1799 return strcmp(a->name, b->name);
1800 }
1801
1802 static void show_dirstat(struct diff_options *options)
1803 {
1804 int i;
1805 unsigned long changed;
1806 struct dirstat_dir dir;
1807 struct diff_queue_struct *q = &diff_queued_diff;
1808
1809 dir.files = NULL;
1810 dir.alloc = 0;
1811 dir.nr = 0;
1812 dir.permille = options->dirstat_permille;
1813 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1814
1815 changed = 0;
1816 for (i = 0; i < q->nr; i++) {
1817 struct diff_filepair *p = q->queue[i];
1818 const char *name;
1819 unsigned long copied, added, damage;
1820 int content_changed;
1821
1822 name = p->two->path ? p->two->path : p->one->path;
1823
1824 if (p->one->sha1_valid && p->two->sha1_valid)
1825 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1826 else
1827 content_changed = 1;
1828
1829 if (!content_changed) {
1830 /*
1831 * The SHA1 has not changed, so pre-/post-content is
1832 * identical. We can therefore skip looking at the
1833 * file contents altogether.
1834 */
1835 damage = 0;
1836 goto found_damage;
1837 }
1838
1839 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1840 /*
1841 * In --dirstat-by-file mode, we don't really need to
1842 * look at the actual file contents at all.
1843 * The fact that the SHA1 changed is enough for us to
1844 * add this file to the list of results
1845 * (with each file contributing equal damage).
1846 */
1847 damage = 1;
1848 goto found_damage;
1849 }
1850
1851 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1852 diff_populate_filespec(p->one, 0);
1853 diff_populate_filespec(p->two, 0);
1854 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1855 &copied, &added);
1856 diff_free_filespec_data(p->one);
1857 diff_free_filespec_data(p->two);
1858 } else if (DIFF_FILE_VALID(p->one)) {
1859 diff_populate_filespec(p->one, 1);
1860 copied = added = 0;
1861 diff_free_filespec_data(p->one);
1862 } else if (DIFF_FILE_VALID(p->two)) {
1863 diff_populate_filespec(p->two, 1);
1864 copied = 0;
1865 added = p->two->size;
1866 diff_free_filespec_data(p->two);
1867 } else
1868 continue;
1869
1870 /*
1871 * Original minus copied is the removed material,
1872 * added is the new material. They are both damages
1873 * made to the preimage.
1874 * If the resulting damage is zero, we know that
1875 * diffcore_count_changes() considers the two entries to
1876 * be identical, but since content_changed is true, we
1877 * know that there must have been _some_ kind of change,
1878 * so we force all entries to have damage > 0.
1879 */
1880 damage = (p->one->size - copied) + added;
1881 if (!damage)
1882 damage = 1;
1883
1884 found_damage:
1885 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1886 dir.files[dir.nr].name = name;
1887 dir.files[dir.nr].changed = damage;
1888 changed += damage;
1889 dir.nr++;
1890 }
1891
1892 /* This can happen even with many files, if everything was renames */
1893 if (!changed)
1894 return;
1895
1896 /* Show all directories with more than x% of the changes */
1897 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1898 gather_dirstat(options, &dir, changed, "", 0);
1899 }
1900
1901 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1902 {
1903 int i;
1904 unsigned long changed;
1905 struct dirstat_dir dir;
1906
1907 if (data->nr == 0)
1908 return;
1909
1910 dir.files = NULL;
1911 dir.alloc = 0;
1912 dir.nr = 0;
1913 dir.permille = options->dirstat_permille;
1914 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1915
1916 changed = 0;
1917 for (i = 0; i < data->nr; i++) {
1918 struct diffstat_file *file = data->files[i];
1919 unsigned long damage = file->added + file->deleted;
1920 if (file->is_binary)
1921 /*
1922 * binary files counts bytes, not lines. Must find some
1923 * way to normalize binary bytes vs. textual lines.
1924 * The following heuristic assumes that there are 64
1925 * bytes per "line".
1926 * This is stupid and ugly, but very cheap...
1927 */
1928 damage = (damage + 63) / 64;
1929 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1930 dir.files[dir.nr].name = file->name;
1931 dir.files[dir.nr].changed = damage;
1932 changed += damage;
1933 dir.nr++;
1934 }
1935
1936 /* This can happen even with many files, if everything was renames */
1937 if (!changed)
1938 return;
1939
1940 /* Show all directories with more than x% of the changes */
1941 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1942 gather_dirstat(options, &dir, changed, "", 0);
1943 }
1944
1945 static void free_diffstat_info(struct diffstat_t *diffstat)
1946 {
1947 int i;
1948 for (i = 0; i < diffstat->nr; i++) {
1949 struct diffstat_file *f = diffstat->files[i];
1950 if (f->name != f->print_name)
1951 free(f->print_name);
1952 free(f->name);
1953 free(f->from_name);
1954 free(f);
1955 }
1956 free(diffstat->files);
1957 }
1958
1959 struct checkdiff_t {
1960 const char *filename;
1961 int lineno;
1962 int conflict_marker_size;
1963 struct diff_options *o;
1964 unsigned ws_rule;
1965 unsigned status;
1966 };
1967
1968 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1969 {
1970 char firstchar;
1971 int cnt;
1972
1973 if (len < marker_size + 1)
1974 return 0;
1975 firstchar = line[0];
1976 switch (firstchar) {
1977 case '=': case '>': case '<': case '|':
1978 break;
1979 default:
1980 return 0;
1981 }
1982 for (cnt = 1; cnt < marker_size; cnt++)
1983 if (line[cnt] != firstchar)
1984 return 0;
1985 /* line[1] thru line[marker_size-1] are same as firstchar */
1986 if (len < marker_size + 1 || !isspace(line[marker_size]))
1987 return 0;
1988 return 1;
1989 }
1990
1991 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1992 {
1993 struct checkdiff_t *data = priv;
1994 int marker_size = data->conflict_marker_size;
1995 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
1996 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
1997 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
1998 char *err;
1999 char *line_prefix = "";
2000 struct strbuf *msgbuf;
2001
2002 assert(data->o);
2003 if (data->o->output_prefix) {
2004 msgbuf = data->o->output_prefix(data->o,
2005 data->o->output_prefix_data);
2006 line_prefix = msgbuf->buf;
2007 }
2008
2009 if (line[0] == '+') {
2010 unsigned bad;
2011 data->lineno++;
2012 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2013 data->status |= 1;
2014 fprintf(data->o->file,
2015 "%s%s:%d: leftover conflict marker\n",
2016 line_prefix, data->filename, data->lineno);
2017 }
2018 bad = ws_check(line + 1, len - 1, data->ws_rule);
2019 if (!bad)
2020 return;
2021 data->status |= bad;
2022 err = whitespace_error_string(bad);
2023 fprintf(data->o->file, "%s%s:%d: %s.\n",
2024 line_prefix, data->filename, data->lineno, err);
2025 free(err);
2026 emit_line(data->o, set, reset, line, 1);
2027 ws_check_emit(line + 1, len - 1, data->ws_rule,
2028 data->o->file, set, reset, ws);
2029 } else if (line[0] == ' ') {
2030 data->lineno++;
2031 } else if (line[0] == '@') {
2032 char *plus = strchr(line, '+');
2033 if (plus)
2034 data->lineno = strtol(plus, NULL, 10) - 1;
2035 else
2036 die("invalid diff");
2037 }
2038 }
2039
2040 static unsigned char *deflate_it(char *data,
2041 unsigned long size,
2042 unsigned long *result_size)
2043 {
2044 int bound;
2045 unsigned char *deflated;
2046 git_zstream stream;
2047
2048 memset(&stream, 0, sizeof(stream));
2049 git_deflate_init(&stream, zlib_compression_level);
2050 bound = git_deflate_bound(&stream, size);
2051 deflated = xmalloc(bound);
2052 stream.next_out = deflated;
2053 stream.avail_out = bound;
2054
2055 stream.next_in = (unsigned char *)data;
2056 stream.avail_in = size;
2057 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2058 ; /* nothing */
2059 git_deflate_end(&stream);
2060 *result_size = stream.total_out;
2061 return deflated;
2062 }
2063
2064 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2065 {
2066 void *cp;
2067 void *delta;
2068 void *deflated;
2069 void *data;
2070 unsigned long orig_size;
2071 unsigned long delta_size;
2072 unsigned long deflate_size;
2073 unsigned long data_size;
2074
2075 /* We could do deflated delta, or we could do just deflated two,
2076 * whichever is smaller.
2077 */
2078 delta = NULL;
2079 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2080 if (one->size && two->size) {
2081 delta = diff_delta(one->ptr, one->size,
2082 two->ptr, two->size,
2083 &delta_size, deflate_size);
2084 if (delta) {
2085 void *to_free = delta;
2086 orig_size = delta_size;
2087 delta = deflate_it(delta, delta_size, &delta_size);
2088 free(to_free);
2089 }
2090 }
2091
2092 if (delta && delta_size < deflate_size) {
2093 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2094 free(deflated);
2095 data = delta;
2096 data_size = delta_size;
2097 }
2098 else {
2099 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2100 free(delta);
2101 data = deflated;
2102 data_size = deflate_size;
2103 }
2104
2105 /* emit data encoded in base85 */
2106 cp = data;
2107 while (data_size) {
2108 int bytes = (52 < data_size) ? 52 : data_size;
2109 char line[70];
2110 data_size -= bytes;
2111 if (bytes <= 26)
2112 line[0] = bytes + 'A' - 1;
2113 else
2114 line[0] = bytes - 26 + 'a' - 1;
2115 encode_85(line + 1, cp, bytes);
2116 cp = (char *) cp + bytes;
2117 fprintf(file, "%s", prefix);
2118 fputs(line, file);
2119 fputc('\n', file);
2120 }
2121 fprintf(file, "%s\n", prefix);
2122 free(data);
2123 }
2124
2125 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2126 {
2127 fprintf(file, "%sGIT binary patch\n", prefix);
2128 emit_binary_diff_body(file, one, two, prefix);
2129 emit_binary_diff_body(file, two, one, prefix);
2130 }
2131
2132 int diff_filespec_is_binary(struct diff_filespec *one)
2133 {
2134 if (one->is_binary == -1) {
2135 diff_filespec_load_driver(one);
2136 if (one->driver->binary != -1)
2137 one->is_binary = one->driver->binary;
2138 else {
2139 if (!one->data && DIFF_FILE_VALID(one))
2140 diff_populate_filespec(one, 0);
2141 if (one->data)
2142 one->is_binary = buffer_is_binary(one->data,
2143 one->size);
2144 if (one->is_binary == -1)
2145 one->is_binary = 0;
2146 }
2147 }
2148 return one->is_binary;
2149 }
2150
2151 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2152 {
2153 diff_filespec_load_driver(one);
2154 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2155 }
2156
2157 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2158 {
2159 if (!options->a_prefix)
2160 options->a_prefix = a;
2161 if (!options->b_prefix)
2162 options->b_prefix = b;
2163 }
2164
2165 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2166 {
2167 if (!DIFF_FILE_VALID(one))
2168 return NULL;
2169
2170 diff_filespec_load_driver(one);
2171 return userdiff_get_textconv(one->driver);
2172 }
2173
2174 static void builtin_diff(const char *name_a,
2175 const char *name_b,
2176 struct diff_filespec *one,
2177 struct diff_filespec *two,
2178 const char *xfrm_msg,
2179 int must_show_header,
2180 struct diff_options *o,
2181 int complete_rewrite)
2182 {
2183 mmfile_t mf1, mf2;
2184 const char *lbl[2];
2185 char *a_one, *b_two;
2186 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2187 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2188 const char *a_prefix, *b_prefix;
2189 struct userdiff_driver *textconv_one = NULL;
2190 struct userdiff_driver *textconv_two = NULL;
2191 struct strbuf header = STRBUF_INIT;
2192 struct strbuf *msgbuf;
2193 char *line_prefix = "";
2194
2195 if (o->output_prefix) {
2196 msgbuf = o->output_prefix(o, o->output_prefix_data);
2197 line_prefix = msgbuf->buf;
2198 }
2199
2200 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2201 (!one->mode || S_ISGITLINK(one->mode)) &&
2202 (!two->mode || S_ISGITLINK(two->mode))) {
2203 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2204 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2205 show_submodule_summary(o->file, one ? one->path : two->path,
2206 one->sha1, two->sha1, two->dirty_submodule,
2207 del, add, reset);
2208 return;
2209 }
2210
2211 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2212 textconv_one = get_textconv(one);
2213 textconv_two = get_textconv(two);
2214 }
2215
2216 diff_set_mnemonic_prefix(o, "a/", "b/");
2217 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2218 a_prefix = o->b_prefix;
2219 b_prefix = o->a_prefix;
2220 } else {
2221 a_prefix = o->a_prefix;
2222 b_prefix = o->b_prefix;
2223 }
2224
2225 /* Never use a non-valid filename anywhere if at all possible */
2226 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2227 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2228
2229 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2230 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2231 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2232 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2233 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2234 if (lbl[0][0] == '/') {
2235 /* /dev/null */
2236 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2237 if (xfrm_msg)
2238 strbuf_addstr(&header, xfrm_msg);
2239 must_show_header = 1;
2240 }
2241 else if (lbl[1][0] == '/') {
2242 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2243 if (xfrm_msg)
2244 strbuf_addstr(&header, xfrm_msg);
2245 must_show_header = 1;
2246 }
2247 else {
2248 if (one->mode != two->mode) {
2249 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2250 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2251 must_show_header = 1;
2252 }
2253 if (xfrm_msg)
2254 strbuf_addstr(&header, xfrm_msg);
2255
2256 /*
2257 * we do not run diff between different kind
2258 * of objects.
2259 */
2260 if ((one->mode ^ two->mode) & S_IFMT)
2261 goto free_ab_and_return;
2262 if (complete_rewrite &&
2263 (textconv_one || !diff_filespec_is_binary(one)) &&
2264 (textconv_two || !diff_filespec_is_binary(two))) {
2265 fprintf(o->file, "%s", header.buf);
2266 strbuf_reset(&header);
2267 emit_rewrite_diff(name_a, name_b, one, two,
2268 textconv_one, textconv_two, o);
2269 o->found_changes = 1;
2270 goto free_ab_and_return;
2271 }
2272 }
2273
2274 if (o->irreversible_delete && lbl[1][0] == '/') {
2275 fprintf(o->file, "%s", header.buf);
2276 strbuf_reset(&header);
2277 goto free_ab_and_return;
2278 } else if (!DIFF_OPT_TST(o, TEXT) &&
2279 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2280 (!textconv_two && diff_filespec_is_binary(two)) )) {
2281 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2282 die("unable to read files to diff");
2283 /* Quite common confusing case */
2284 if (mf1.size == mf2.size &&
2285 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2286 if (must_show_header)
2287 fprintf(o->file, "%s", header.buf);
2288 goto free_ab_and_return;
2289 }
2290 fprintf(o->file, "%s", header.buf);
2291 strbuf_reset(&header);
2292 if (DIFF_OPT_TST(o, BINARY))
2293 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2294 else
2295 fprintf(o->file, "%sBinary files %s and %s differ\n",
2296 line_prefix, lbl[0], lbl[1]);
2297 o->found_changes = 1;
2298 } else {
2299 /* Crazy xdl interfaces.. */
2300 const char *diffopts = getenv("GIT_DIFF_OPTS");
2301 xpparam_t xpp;
2302 xdemitconf_t xecfg;
2303 struct emit_callback ecbdata;
2304 const struct userdiff_funcname *pe;
2305
2306 if (must_show_header) {
2307 fprintf(o->file, "%s", header.buf);
2308 strbuf_reset(&header);
2309 }
2310
2311 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2312 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2313
2314 pe = diff_funcname_pattern(one);
2315 if (!pe)
2316 pe = diff_funcname_pattern(two);
2317
2318 memset(&xpp, 0, sizeof(xpp));
2319 memset(&xecfg, 0, sizeof(xecfg));
2320 memset(&ecbdata, 0, sizeof(ecbdata));
2321 ecbdata.label_path = lbl;
2322 ecbdata.color_diff = want_color(o->use_color);
2323 ecbdata.found_changesp = &o->found_changes;
2324 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2325 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2326 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2327 ecbdata.opt = o;
2328 ecbdata.header = header.len ? &header : NULL;
2329 xpp.flags = o->xdl_opts;
2330 xecfg.ctxlen = o->context;
2331 xecfg.interhunkctxlen = o->interhunkcontext;
2332 xecfg.flags = XDL_EMIT_FUNCNAMES;
2333 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2334 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2335 if (pe)
2336 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2337 if (!diffopts)
2338 ;
2339 else if (!prefixcmp(diffopts, "--unified="))
2340 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2341 else if (!prefixcmp(diffopts, "-u"))
2342 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2343 if (o->word_diff)
2344 init_diff_words_data(&ecbdata, o, one, two);
2345 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2346 &xpp, &xecfg);
2347 if (o->word_diff)
2348 free_diff_words_data(&ecbdata);
2349 if (textconv_one)
2350 free(mf1.ptr);
2351 if (textconv_two)
2352 free(mf2.ptr);
2353 xdiff_clear_find_func(&xecfg);
2354 }
2355
2356 free_ab_and_return:
2357 strbuf_release(&header);
2358 diff_free_filespec_data(one);
2359 diff_free_filespec_data(two);
2360 free(a_one);
2361 free(b_two);
2362 return;
2363 }
2364
2365 static void builtin_diffstat(const char *name_a, const char *name_b,
2366 struct diff_filespec *one,
2367 struct diff_filespec *two,
2368 struct diffstat_t *diffstat,
2369 struct diff_options *o,
2370 int complete_rewrite)
2371 {
2372 mmfile_t mf1, mf2;
2373 struct diffstat_file *data;
2374
2375 data = diffstat_add(diffstat, name_a, name_b);
2376
2377 if (!one || !two) {
2378 data->is_unmerged = 1;
2379 return;
2380 }
2381
2382 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2383 data->is_binary = 1;
2384 data->added = diff_filespec_size(two);
2385 data->deleted = diff_filespec_size(one);
2386 }
2387
2388 else if (complete_rewrite) {
2389 diff_populate_filespec(one, 0);
2390 diff_populate_filespec(two, 0);
2391 data->deleted = count_lines(one->data, one->size);
2392 data->added = count_lines(two->data, two->size);
2393 }
2394
2395 else {
2396 /* Crazy xdl interfaces.. */
2397 xpparam_t xpp;
2398 xdemitconf_t xecfg;
2399
2400 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2401 die("unable to read files to diff");
2402
2403 memset(&xpp, 0, sizeof(xpp));
2404 memset(&xecfg, 0, sizeof(xecfg));
2405 xpp.flags = o->xdl_opts;
2406 xecfg.ctxlen = o->context;
2407 xecfg.interhunkctxlen = o->interhunkcontext;
2408 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2409 &xpp, &xecfg);
2410 }
2411
2412 diff_free_filespec_data(one);
2413 diff_free_filespec_data(two);
2414 }
2415
2416 static void builtin_checkdiff(const char *name_a, const char *name_b,
2417 const char *attr_path,
2418 struct diff_filespec *one,
2419 struct diff_filespec *two,
2420 struct diff_options *o)
2421 {
2422 mmfile_t mf1, mf2;
2423 struct checkdiff_t data;
2424
2425 if (!two)
2426 return;
2427
2428 memset(&data, 0, sizeof(data));
2429 data.filename = name_b ? name_b : name_a;
2430 data.lineno = 0;
2431 data.o = o;
2432 data.ws_rule = whitespace_rule(attr_path);
2433 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2434
2435 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2436 die("unable to read files to diff");
2437
2438 /*
2439 * All the other codepaths check both sides, but not checking
2440 * the "old" side here is deliberate. We are checking the newly
2441 * introduced changes, and as long as the "new" side is text, we
2442 * can and should check what it introduces.
2443 */
2444 if (diff_filespec_is_binary(two))
2445 goto free_and_return;
2446 else {
2447 /* Crazy xdl interfaces.. */
2448 xpparam_t xpp;
2449 xdemitconf_t xecfg;
2450
2451 memset(&xpp, 0, sizeof(xpp));
2452 memset(&xecfg, 0, sizeof(xecfg));
2453 xecfg.ctxlen = 1; /* at least one context line */
2454 xpp.flags = 0;
2455 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2456 &xpp, &xecfg);
2457
2458 if (data.ws_rule & WS_BLANK_AT_EOF) {
2459 struct emit_callback ecbdata;
2460 int blank_at_eof;
2461
2462 ecbdata.ws_rule = data.ws_rule;
2463 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2464 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2465
2466 if (blank_at_eof) {
2467 static char *err;
2468 if (!err)
2469 err = whitespace_error_string(WS_BLANK_AT_EOF);
2470 fprintf(o->file, "%s:%d: %s.\n",
2471 data.filename, blank_at_eof, err);
2472 data.status = 1; /* report errors */
2473 }
2474 }
2475 }
2476 free_and_return:
2477 diff_free_filespec_data(one);
2478 diff_free_filespec_data(two);
2479 if (data.status)
2480 DIFF_OPT_SET(o, CHECK_FAILED);
2481 }
2482
2483 struct diff_filespec *alloc_filespec(const char *path)
2484 {
2485 int namelen = strlen(path);
2486 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2487
2488 memset(spec, 0, sizeof(*spec));
2489 spec->path = (char *)(spec + 1);
2490 memcpy(spec->path, path, namelen+1);
2491 spec->count = 1;
2492 spec->is_binary = -1;
2493 return spec;
2494 }
2495
2496 void free_filespec(struct diff_filespec *spec)
2497 {
2498 if (!--spec->count) {
2499 diff_free_filespec_data(spec);
2500 free(spec);
2501 }
2502 }
2503
2504 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2505 unsigned short mode)
2506 {
2507 if (mode) {
2508 spec->mode = canon_mode(mode);
2509 hashcpy(spec->sha1, sha1);
2510 spec->sha1_valid = !is_null_sha1(sha1);
2511 }
2512 }
2513
2514 /*
2515 * Given a name and sha1 pair, if the index tells us the file in
2516 * the work tree has that object contents, return true, so that
2517 * prepare_temp_file() does not have to inflate and extract.
2518 */
2519 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2520 {
2521 struct cache_entry *ce;
2522 struct stat st;
2523 int pos, len;
2524
2525 /*
2526 * We do not read the cache ourselves here, because the
2527 * benchmark with my previous version that always reads cache
2528 * shows that it makes things worse for diff-tree comparing
2529 * two linux-2.6 kernel trees in an already checked out work
2530 * tree. This is because most diff-tree comparisons deal with
2531 * only a small number of files, while reading the cache is
2532 * expensive for a large project, and its cost outweighs the
2533 * savings we get by not inflating the object to a temporary
2534 * file. Practically, this code only helps when we are used
2535 * by diff-cache --cached, which does read the cache before
2536 * calling us.
2537 */
2538 if (!active_cache)
2539 return 0;
2540
2541 /* We want to avoid the working directory if our caller
2542 * doesn't need the data in a normal file, this system
2543 * is rather slow with its stat/open/mmap/close syscalls,
2544 * and the object is contained in a pack file. The pack
2545 * is probably already open and will be faster to obtain
2546 * the data through than the working directory. Loose
2547 * objects however would tend to be slower as they need
2548 * to be individually opened and inflated.
2549 */
2550 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2551 return 0;
2552
2553 len = strlen(name);
2554 pos = cache_name_pos(name, len);
2555 if (pos < 0)
2556 return 0;
2557 ce = active_cache[pos];
2558
2559 /*
2560 * This is not the sha1 we are looking for, or
2561 * unreusable because it is not a regular file.
2562 */
2563 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2564 return 0;
2565
2566 /*
2567 * If ce is marked as "assume unchanged", there is no
2568 * guarantee that work tree matches what we are looking for.
2569 */
2570 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2571 return 0;
2572
2573 /*
2574 * If ce matches the file in the work tree, we can reuse it.
2575 */
2576 if (ce_uptodate(ce) ||
2577 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2578 return 1;
2579
2580 return 0;
2581 }
2582
2583 static int populate_from_stdin(struct diff_filespec *s)
2584 {
2585 struct strbuf buf = STRBUF_INIT;
2586 size_t size = 0;
2587
2588 if (strbuf_read(&buf, 0, 0) < 0)
2589 return error("error while reading from stdin %s",
2590 strerror(errno));
2591
2592 s->should_munmap = 0;
2593 s->data = strbuf_detach(&buf, &size);
2594 s->size = size;
2595 s->should_free = 1;
2596 return 0;
2597 }
2598
2599 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2600 {
2601 int len;
2602 char *data = xmalloc(100), *dirty = "";
2603
2604 /* Are we looking at the work tree? */
2605 if (s->dirty_submodule)
2606 dirty = "-dirty";
2607
2608 len = snprintf(data, 100,
2609 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2610 s->data = data;
2611 s->size = len;
2612 s->should_free = 1;
2613 if (size_only) {
2614 s->data = NULL;
2615 free(data);
2616 }
2617 return 0;
2618 }
2619
2620 /*
2621 * While doing rename detection and pickaxe operation, we may need to
2622 * grab the data for the blob (or file) for our own in-core comparison.
2623 * diff_filespec has data and size fields for this purpose.
2624 */
2625 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2626 {
2627 int err = 0;
2628 if (!DIFF_FILE_VALID(s))
2629 die("internal error: asking to populate invalid file.");
2630 if (S_ISDIR(s->mode))
2631 return -1;
2632
2633 if (s->data)
2634 return 0;
2635
2636 if (size_only && 0 < s->size)
2637 return 0;
2638
2639 if (S_ISGITLINK(s->mode))
2640 return diff_populate_gitlink(s, size_only);
2641
2642 if (!s->sha1_valid ||
2643 reuse_worktree_file(s->path, s->sha1, 0)) {
2644 struct strbuf buf = STRBUF_INIT;
2645 struct stat st;
2646 int fd;
2647
2648 if (!strcmp(s->path, "-"))
2649 return populate_from_stdin(s);
2650
2651 if (lstat(s->path, &st) < 0) {
2652 if (errno == ENOENT) {
2653 err_empty:
2654 err = -1;
2655 empty:
2656 s->data = (char *)"";
2657 s->size = 0;
2658 return err;
2659 }
2660 }
2661 s->size = xsize_t(st.st_size);
2662 if (!s->size)
2663 goto empty;
2664 if (S_ISLNK(st.st_mode)) {
2665 struct strbuf sb = STRBUF_INIT;
2666
2667 if (strbuf_readlink(&sb, s->path, s->size))
2668 goto err_empty;
2669 s->size = sb.len;
2670 s->data = strbuf_detach(&sb, NULL);
2671 s->should_free = 1;
2672 return 0;
2673 }
2674 if (size_only)
2675 return 0;
2676 fd = open(s->path, O_RDONLY);
2677 if (fd < 0)
2678 goto err_empty;
2679 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2680 close(fd);
2681 s->should_munmap = 1;
2682
2683 /*
2684 * Convert from working tree format to canonical git format
2685 */
2686 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2687 size_t size = 0;
2688 munmap(s->data, s->size);
2689 s->should_munmap = 0;
2690 s->data = strbuf_detach(&buf, &size);
2691 s->size = size;
2692 s->should_free = 1;
2693 }
2694 }
2695 else {
2696 enum object_type type;
2697 if (size_only) {
2698 type = sha1_object_info(s->sha1, &s->size);
2699 if (type < 0)
2700 die("unable to read %s", sha1_to_hex(s->sha1));
2701 } else {
2702 s->data = read_sha1_file(s->sha1, &type, &s->size);
2703 if (!s->data)
2704 die("unable to read %s", sha1_to_hex(s->sha1));
2705 s->should_free = 1;
2706 }
2707 }
2708 return 0;
2709 }
2710
2711 void diff_free_filespec_blob(struct diff_filespec *s)
2712 {
2713 if (s->should_free)
2714 free(s->data);
2715 else if (s->should_munmap)
2716 munmap(s->data, s->size);
2717
2718 if (s->should_free || s->should_munmap) {
2719 s->should_free = s->should_munmap = 0;
2720 s->data = NULL;
2721 }
2722 }
2723
2724 void diff_free_filespec_data(struct diff_filespec *s)
2725 {
2726 diff_free_filespec_blob(s);
2727 free(s->cnt_data);
2728 s->cnt_data = NULL;
2729 }
2730
2731 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2732 void *blob,
2733 unsigned long size,
2734 const unsigned char *sha1,
2735 int mode)
2736 {
2737 int fd;
2738 struct strbuf buf = STRBUF_INIT;
2739 struct strbuf template = STRBUF_INIT;
2740 char *path_dup = xstrdup(path);
2741 const char *base = basename(path_dup);
2742
2743 /* Generate "XXXXXX_basename.ext" */
2744 strbuf_addstr(&template, "XXXXXX_");
2745 strbuf_addstr(&template, base);
2746
2747 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2748 strlen(base) + 1);
2749 if (fd < 0)
2750 die_errno("unable to create temp-file");
2751 if (convert_to_working_tree(path,
2752 (const char *)blob, (size_t)size, &buf)) {
2753 blob = buf.buf;
2754 size = buf.len;
2755 }
2756 if (write_in_full(fd, blob, size) != size)
2757 die_errno("unable to write temp-file");
2758 close(fd);
2759 temp->name = temp->tmp_path;
2760 strcpy(temp->hex, sha1_to_hex(sha1));
2761 temp->hex[40] = 0;
2762 sprintf(temp->mode, "%06o", mode);
2763 strbuf_release(&buf);
2764 strbuf_release(&template);
2765 free(path_dup);
2766 }
2767
2768 static struct diff_tempfile *prepare_temp_file(const char *name,
2769 struct diff_filespec *one)
2770 {
2771 struct diff_tempfile *temp = claim_diff_tempfile();
2772
2773 if (!DIFF_FILE_VALID(one)) {
2774 not_a_valid_file:
2775 /* A '-' entry produces this for file-2, and
2776 * a '+' entry produces this for file-1.
2777 */
2778 temp->name = "/dev/null";
2779 strcpy(temp->hex, ".");
2780 strcpy(temp->mode, ".");
2781 return temp;
2782 }
2783
2784 if (!remove_tempfile_installed) {
2785 atexit(remove_tempfile);
2786 sigchain_push_common(remove_tempfile_on_signal);
2787 remove_tempfile_installed = 1;
2788 }
2789
2790 if (!one->sha1_valid ||
2791 reuse_worktree_file(name, one->sha1, 1)) {
2792 struct stat st;
2793 if (lstat(name, &st) < 0) {
2794 if (errno == ENOENT)
2795 goto not_a_valid_file;
2796 die_errno("stat(%s)", name);
2797 }
2798 if (S_ISLNK(st.st_mode)) {
2799 struct strbuf sb = STRBUF_INIT;
2800 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2801 die_errno("readlink(%s)", name);
2802 prep_temp_blob(name, temp, sb.buf, sb.len,
2803 (one->sha1_valid ?
2804 one->sha1 : null_sha1),
2805 (one->sha1_valid ?
2806 one->mode : S_IFLNK));
2807 strbuf_release(&sb);
2808 }
2809 else {
2810 /* we can borrow from the file in the work tree */
2811 temp->name = name;
2812 if (!one->sha1_valid)
2813 strcpy(temp->hex, sha1_to_hex(null_sha1));
2814 else
2815 strcpy(temp->hex, sha1_to_hex(one->sha1));
2816 /* Even though we may sometimes borrow the
2817 * contents from the work tree, we always want
2818 * one->mode. mode is trustworthy even when
2819 * !(one->sha1_valid), as long as
2820 * DIFF_FILE_VALID(one).
2821 */
2822 sprintf(temp->mode, "%06o", one->mode);
2823 }
2824 return temp;
2825 }
2826 else {
2827 if (diff_populate_filespec(one, 0))
2828 die("cannot read data blob for %s", one->path);
2829 prep_temp_blob(name, temp, one->data, one->size,
2830 one->sha1, one->mode);
2831 }
2832 return temp;
2833 }
2834
2835 /* An external diff command takes:
2836 *
2837 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2838 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2839 *
2840 */
2841 static void run_external_diff(const char *pgm,
2842 const char *name,
2843 const char *other,
2844 struct diff_filespec *one,
2845 struct diff_filespec *two,
2846 const char *xfrm_msg,
2847 int complete_rewrite)
2848 {
2849 const char *spawn_arg[10];
2850 int retval;
2851 const char **arg = &spawn_arg[0];
2852
2853 if (one && two) {
2854 struct diff_tempfile *temp_one, *temp_two;
2855 const char *othername = (other ? other : name);
2856 temp_one = prepare_temp_file(name, one);
2857 temp_two = prepare_temp_file(othername, two);
2858 *arg++ = pgm;
2859 *arg++ = name;
2860 *arg++ = temp_one->name;
2861 *arg++ = temp_one->hex;
2862 *arg++ = temp_one->mode;
2863 *arg++ = temp_two->name;
2864 *arg++ = temp_two->hex;
2865 *arg++ = temp_two->mode;
2866 if (other) {
2867 *arg++ = other;
2868 *arg++ = xfrm_msg;
2869 }
2870 } else {
2871 *arg++ = pgm;
2872 *arg++ = name;
2873 }
2874 *arg = NULL;
2875 fflush(NULL);
2876 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2877 remove_tempfile();
2878 if (retval) {
2879 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2880 exit(1);
2881 }
2882 }
2883
2884 static int similarity_index(struct diff_filepair *p)
2885 {
2886 return p->score * 100 / MAX_SCORE;
2887 }
2888
2889 static void fill_metainfo(struct strbuf *msg,
2890 const char *name,
2891 const char *other,
2892 struct diff_filespec *one,
2893 struct diff_filespec *two,
2894 struct diff_options *o,
2895 struct diff_filepair *p,
2896 int *must_show_header,
2897 int use_color)
2898 {
2899 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2900 const char *reset = diff_get_color(use_color, DIFF_RESET);
2901 struct strbuf *msgbuf;
2902 char *line_prefix = "";
2903
2904 *must_show_header = 1;
2905 if (o->output_prefix) {
2906 msgbuf = o->output_prefix(o, o->output_prefix_data);
2907 line_prefix = msgbuf->buf;
2908 }
2909 strbuf_init(msg, PATH_MAX * 2 + 300);
2910 switch (p->status) {
2911 case DIFF_STATUS_COPIED:
2912 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2913 line_prefix, set, similarity_index(p));
2914 strbuf_addf(msg, "%s\n%s%scopy from ",
2915 reset, line_prefix, set);
2916 quote_c_style(name, msg, NULL, 0);
2917 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2918 quote_c_style(other, msg, NULL, 0);
2919 strbuf_addf(msg, "%s\n", reset);
2920 break;
2921 case DIFF_STATUS_RENAMED:
2922 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2923 line_prefix, set, similarity_index(p));
2924 strbuf_addf(msg, "%s\n%s%srename from ",
2925 reset, line_prefix, set);
2926 quote_c_style(name, msg, NULL, 0);
2927 strbuf_addf(msg, "%s\n%s%srename to ",
2928 reset, line_prefix, set);
2929 quote_c_style(other, msg, NULL, 0);
2930 strbuf_addf(msg, "%s\n", reset);
2931 break;
2932 case DIFF_STATUS_MODIFIED:
2933 if (p->score) {
2934 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2935 line_prefix,
2936 set, similarity_index(p), reset);
2937 break;
2938 }
2939 /* fallthru */
2940 default:
2941 *must_show_header = 0;
2942 }
2943 if (one && two && hashcmp(one->sha1, two->sha1)) {
2944 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2945
2946 if (DIFF_OPT_TST(o, BINARY)) {
2947 mmfile_t mf;
2948 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2949 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2950 abbrev = 40;
2951 }
2952 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2953 find_unique_abbrev(one->sha1, abbrev));
2954 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2955 if (one->mode == two->mode)
2956 strbuf_addf(msg, " %06o", one->mode);
2957 strbuf_addf(msg, "%s\n", reset);
2958 }
2959 }
2960
2961 static void run_diff_cmd(const char *pgm,
2962 const char *name,
2963 const char *other,
2964 const char *attr_path,
2965 struct diff_filespec *one,
2966 struct diff_filespec *two,
2967 struct strbuf *msg,
2968 struct diff_options *o,
2969 struct diff_filepair *p)
2970 {
2971 const char *xfrm_msg = NULL;
2972 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2973 int must_show_header = 0;
2974
2975 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2976 pgm = NULL;
2977 else {
2978 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2979 if (drv && drv->external)
2980 pgm = drv->external;
2981 }
2982
2983 if (msg) {
2984 /*
2985 * don't use colors when the header is intended for an
2986 * external diff driver
2987 */
2988 fill_metainfo(msg, name, other, one, two, o, p,
2989 &must_show_header,
2990 want_color(o->use_color) && !pgm);
2991 xfrm_msg = msg->len ? msg->buf : NULL;
2992 }
2993
2994 if (pgm) {
2995 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2996 complete_rewrite);
2997 return;
2998 }
2999 if (one && two)
3000 builtin_diff(name, other ? other : name,
3001 one, two, xfrm_msg, must_show_header,
3002 o, complete_rewrite);
3003 else
3004 fprintf(o->file, "* Unmerged path %s\n", name);
3005 }
3006
3007 static void diff_fill_sha1_info(struct diff_filespec *one)
3008 {
3009 if (DIFF_FILE_VALID(one)) {
3010 if (!one->sha1_valid) {
3011 struct stat st;
3012 if (!strcmp(one->path, "-")) {
3013 hashcpy(one->sha1, null_sha1);
3014 return;
3015 }
3016 if (lstat(one->path, &st) < 0)
3017 die_errno("stat '%s'", one->path);
3018 if (index_path(one->sha1, one->path, &st, 0))
3019 die("cannot hash %s", one->path);
3020 }
3021 }
3022 else
3023 hashclr(one->sha1);
3024 }
3025
3026 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3027 {
3028 /* Strip the prefix but do not molest /dev/null and absolute paths */
3029 if (*namep && **namep != '/') {
3030 *namep += prefix_length;
3031 if (**namep == '/')
3032 ++*namep;
3033 }
3034 if (*otherp && **otherp != '/') {
3035 *otherp += prefix_length;
3036 if (**otherp == '/')
3037 ++*otherp;
3038 }
3039 }
3040
3041 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3042 {
3043 const char *pgm = external_diff();
3044 struct strbuf msg;
3045 struct diff_filespec *one = p->one;
3046 struct diff_filespec *two = p->two;
3047 const char *name;
3048 const char *other;
3049 const char *attr_path;
3050
3051 name = p->one->path;
3052 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3053 attr_path = name;
3054 if (o->prefix_length)
3055 strip_prefix(o->prefix_length, &name, &other);
3056
3057 if (DIFF_PAIR_UNMERGED(p)) {
3058 run_diff_cmd(pgm, name, NULL, attr_path,
3059 NULL, NULL, NULL, o, p);
3060 return;
3061 }
3062
3063 diff_fill_sha1_info(one);
3064 diff_fill_sha1_info(two);
3065
3066 if (!pgm &&
3067 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3068 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3069 /*
3070 * a filepair that changes between file and symlink
3071 * needs to be split into deletion and creation.
3072 */
3073 struct diff_filespec *null = alloc_filespec(two->path);
3074 run_diff_cmd(NULL, name, other, attr_path,
3075 one, null, &msg, o, p);
3076 free(null);
3077 strbuf_release(&msg);
3078
3079 null = alloc_filespec(one->path);
3080 run_diff_cmd(NULL, name, other, attr_path,
3081 null, two, &msg, o, p);
3082 free(null);
3083 }
3084 else
3085 run_diff_cmd(pgm, name, other, attr_path,
3086 one, two, &msg, o, p);
3087
3088 strbuf_release(&msg);
3089 }
3090
3091 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3092 struct diffstat_t *diffstat)
3093 {
3094 const char *name;
3095 const char *other;
3096 int complete_rewrite = 0;
3097
3098 if (DIFF_PAIR_UNMERGED(p)) {
3099 /* unmerged */
3100 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
3101 return;
3102 }
3103
3104 name = p->one->path;
3105 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3106
3107 if (o->prefix_length)
3108 strip_prefix(o->prefix_length, &name, &other);
3109
3110 diff_fill_sha1_info(p->one);
3111 diff_fill_sha1_info(p->two);
3112
3113 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3114 complete_rewrite = 1;
3115 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
3116 }
3117
3118 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3119 {
3120 const char *name;
3121 const char *other;
3122 const char *attr_path;
3123
3124 if (DIFF_PAIR_UNMERGED(p)) {
3125 /* unmerged */
3126 return;
3127 }
3128
3129 name = p->one->path;
3130 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3131 attr_path = other ? other : name;
3132
3133 if (o->prefix_length)
3134 strip_prefix(o->prefix_length, &name, &other);
3135
3136 diff_fill_sha1_info(p->one);
3137 diff_fill_sha1_info(p->two);
3138
3139 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3140 }
3141
3142 void diff_setup(struct diff_options *options)
3143 {
3144 memcpy(options, &default_diff_options, sizeof(*options));
3145
3146 options->file = stdout;
3147
3148 options->line_termination = '\n';
3149 options->break_opt = -1;
3150 options->rename_limit = -1;
3151 options->dirstat_permille = diff_dirstat_permille_default;
3152 options->context = 3;
3153 DIFF_OPT_SET(options, RENAME_EMPTY);
3154
3155 options->change = diff_change;
3156 options->add_remove = diff_addremove;
3157 options->use_color = diff_use_color_default;
3158 options->detect_rename = diff_detect_rename_default;
3159
3160 if (diff_no_prefix) {
3161 options->a_prefix = options->b_prefix = "";
3162 } else if (!diff_mnemonic_prefix) {
3163 options->a_prefix = "a/";
3164 options->b_prefix = "b/";
3165 }
3166 }
3167
3168 int diff_setup_done(struct diff_options *options)
3169 {
3170 int count = 0;
3171
3172 if (options->output_format & DIFF_FORMAT_NAME)
3173 count++;
3174 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3175 count++;
3176 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3177 count++;
3178 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3179 count++;
3180 if (count > 1)
3181 die("--name-only, --name-status, --check and -s are mutually exclusive");
3182
3183 /*
3184 * Most of the time we can say "there are changes"
3185 * only by checking if there are changed paths, but
3186 * --ignore-whitespace* options force us to look
3187 * inside contents.
3188 */
3189
3190 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3191 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3192 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3193 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3194 else
3195 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3196
3197 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3198 options->detect_rename = DIFF_DETECT_COPY;
3199
3200 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3201 options->prefix = NULL;
3202 if (options->prefix)
3203 options->prefix_length = strlen(options->prefix);
3204 else
3205 options->prefix_length = 0;
3206
3207 if (options->output_format & (DIFF_FORMAT_NAME |
3208 DIFF_FORMAT_NAME_STATUS |
3209 DIFF_FORMAT_CHECKDIFF |
3210 DIFF_FORMAT_NO_OUTPUT))
3211 options->output_format &= ~(DIFF_FORMAT_RAW |
3212 DIFF_FORMAT_NUMSTAT |
3213 DIFF_FORMAT_DIFFSTAT |
3214 DIFF_FORMAT_SHORTSTAT |
3215 DIFF_FORMAT_DIRSTAT |
3216 DIFF_FORMAT_SUMMARY |
3217 DIFF_FORMAT_PATCH);
3218
3219 /*
3220 * These cases always need recursive; we do not drop caller-supplied
3221 * recursive bits for other formats here.
3222 */
3223 if (options->output_format & (DIFF_FORMAT_PATCH |
3224 DIFF_FORMAT_NUMSTAT |
3225 DIFF_FORMAT_DIFFSTAT |
3226 DIFF_FORMAT_SHORTSTAT |
3227 DIFF_FORMAT_DIRSTAT |
3228 DIFF_FORMAT_SUMMARY |
3229 DIFF_FORMAT_CHECKDIFF))
3230 DIFF_OPT_SET(options, RECURSIVE);
3231 /*
3232 * Also pickaxe would not work very well if you do not say recursive
3233 */
3234 if (options->pickaxe)
3235 DIFF_OPT_SET(options, RECURSIVE);
3236 /*
3237 * When patches are generated, submodules diffed against the work tree
3238 * must be checked for dirtiness too so it can be shown in the output
3239 */
3240 if (options->output_format & DIFF_FORMAT_PATCH)
3241 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3242
3243 if (options->detect_rename && options->rename_limit < 0)
3244 options->rename_limit = diff_rename_limit_default;
3245 if (options->setup & DIFF_SETUP_USE_CACHE) {
3246 if (!active_cache)
3247 /* read-cache does not die even when it fails
3248 * so it is safe for us to do this here. Also
3249 * it does not smudge active_cache or active_nr
3250 * when it fails, so we do not have to worry about
3251 * cleaning it up ourselves either.
3252 */
3253 read_cache();
3254 }
3255 if (options->abbrev <= 0 || 40 < options->abbrev)
3256 options->abbrev = 40; /* full */
3257
3258 /*
3259 * It does not make sense to show the first hit we happened
3260 * to have found. It does not make sense not to return with
3261 * exit code in such a case either.
3262 */
3263 if (DIFF_OPT_TST(options, QUICK)) {
3264 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3265 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3266 }
3267
3268 return 0;
3269 }
3270
3271 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3272 {
3273 char c, *eq;
3274 int len;
3275
3276 if (*arg != '-')
3277 return 0;
3278 c = *++arg;
3279 if (!c)
3280 return 0;
3281 if (c == arg_short) {
3282 c = *++arg;
3283 if (!c)
3284 return 1;
3285 if (val && isdigit(c)) {
3286 char *end;
3287 int n = strtoul(arg, &end, 10);
3288 if (*end)
3289 return 0;
3290 *val = n;
3291 return 1;
3292 }
3293 return 0;
3294 }
3295 if (c != '-')
3296 return 0;
3297 arg++;
3298 eq = strchr(arg, '=');
3299 if (eq)
3300 len = eq - arg;
3301 else
3302 len = strlen(arg);
3303 if (!len || strncmp(arg, arg_long, len))
3304 return 0;
3305 if (eq) {
3306 int n;
3307 char *end;
3308 if (!isdigit(*++eq))
3309 return 0;
3310 n = strtoul(eq, &end, 10);
3311 if (*end)
3312 return 0;
3313 *val = n;
3314 }
3315 return 1;
3316 }
3317
3318 static int diff_scoreopt_parse(const char *opt);
3319
3320 static inline int short_opt(char opt, const char **argv,
3321 const char **optarg)
3322 {
3323 const char *arg = argv[0];
3324 if (arg[0] != '-' || arg[1] != opt)
3325 return 0;
3326 if (arg[2] != '\0') {
3327 *optarg = arg + 2;
3328 return 1;
3329 }
3330 if (!argv[1])
3331 die("Option '%c' requires a value", opt);
3332 *optarg = argv[1];
3333 return 2;
3334 }
3335
3336 int parse_long_opt(const char *opt, const char **argv,
3337 const char **optarg)
3338 {
3339 const char *arg = argv[0];
3340 if (arg[0] != '-' || arg[1] != '-')
3341 return 0;
3342 arg += strlen("--");
3343 if (prefixcmp(arg, opt))
3344 return 0;
3345 arg += strlen(opt);
3346 if (*arg == '=') { /* sticked form: --option=value */
3347 *optarg = arg + 1;
3348 return 1;
3349 }
3350 if (*arg != '\0')
3351 return 0;
3352 /* separate form: --option value */
3353 if (!argv[1])
3354 die("Option '--%s' requires a value", opt);
3355 *optarg = argv[1];
3356 return 2;
3357 }
3358
3359 static int stat_opt(struct diff_options *options, const char **av)
3360 {
3361 const char *arg = av[0];
3362 char *end;
3363 int width = options->stat_width;
3364 int name_width = options->stat_name_width;
3365 int graph_width = options->stat_graph_width;
3366 int count = options->stat_count;
3367 int argcount = 1;
3368
3369 arg += strlen("--stat");
3370 end = (char *)arg;
3371
3372 switch (*arg) {
3373 case '-':
3374 if (!prefixcmp(arg, "-width")) {
3375 arg += strlen("-width");
3376 if (*arg == '=')
3377 width = strtoul(arg + 1, &end, 10);
3378 else if (!*arg && !av[1])
3379 die("Option '--stat-width' requires a value");
3380 else if (!*arg) {
3381 width = strtoul(av[1], &end, 10);
3382 argcount = 2;
3383 }
3384 } else if (!prefixcmp(arg, "-name-width")) {
3385 arg += strlen("-name-width");
3386 if (*arg == '=')
3387 name_width = strtoul(arg + 1, &end, 10);
3388 else if (!*arg && !av[1])
3389 die("Option '--stat-name-width' requires a value");
3390 else if (!*arg) {
3391 name_width = strtoul(av[1], &end, 10);
3392 argcount = 2;
3393 }
3394 } else if (!prefixcmp(arg, "-graph-width")) {
3395 arg += strlen("-graph-width");
3396 if (*arg == '=')
3397 graph_width = strtoul(arg + 1, &end, 10);
3398 else if (!*arg && !av[1])
3399 die("Option '--stat-graph-width' requires a value");
3400 else if (!*arg) {
3401 graph_width = strtoul(av[1], &end, 10);
3402 argcount = 2;
3403 }
3404 } else if (!prefixcmp(arg, "-count")) {
3405 arg += strlen("-count");
3406 if (*arg == '=')
3407 count = strtoul(arg + 1, &end, 10);
3408 else if (!*arg && !av[1])
3409 die("Option '--stat-count' requires a value");
3410 else if (!*arg) {
3411 count = strtoul(av[1], &end, 10);
3412 argcount = 2;
3413 }
3414 }
3415 break;
3416 case '=':
3417 width = strtoul(arg+1, &end, 10);
3418 if (*end == ',')
3419 name_width = strtoul(end+1, &end, 10);
3420 if (*end == ',')
3421 count = strtoul(end+1, &end, 10);
3422 }
3423
3424 /* Important! This checks all the error cases! */
3425 if (*end)
3426 return 0;
3427 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3428 options->stat_name_width = name_width;
3429 options->stat_graph_width = graph_width;
3430 options->stat_width = width;
3431 options->stat_count = count;
3432 return argcount;
3433 }
3434
3435 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3436 {
3437 struct strbuf errmsg = STRBUF_INIT;
3438 if (parse_dirstat_params(options, params, &errmsg))
3439 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3440 errmsg.buf);
3441 strbuf_release(&errmsg);
3442 /*
3443 * The caller knows a dirstat-related option is given from the command
3444 * line; allow it to say "return this_function();"
3445 */
3446 options->output_format |= DIFF_FORMAT_DIRSTAT;
3447 return 1;
3448 }
3449
3450 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3451 {
3452 const char *arg = av[0];
3453 const char *optarg;
3454 int argcount;
3455
3456 /* Output format options */
3457 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3458 options->output_format |= DIFF_FORMAT_PATCH;
3459 else if (opt_arg(arg, 'U', "unified", &options->context))
3460 options->output_format |= DIFF_FORMAT_PATCH;
3461 else if (!strcmp(arg, "--raw"))
3462 options->output_format |= DIFF_FORMAT_RAW;
3463 else if (!strcmp(arg, "--patch-with-raw"))
3464 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3465 else if (!strcmp(arg, "--numstat"))
3466 options->output_format |= DIFF_FORMAT_NUMSTAT;
3467 else if (!strcmp(arg, "--shortstat"))
3468 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3469 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3470 return parse_dirstat_opt(options, "");
3471 else if (!prefixcmp(arg, "-X"))
3472 return parse_dirstat_opt(options, arg + 2);
3473 else if (!prefixcmp(arg, "--dirstat="))
3474 return parse_dirstat_opt(options, arg + 10);
3475 else if (!strcmp(arg, "--cumulative"))
3476 return parse_dirstat_opt(options, "cumulative");
3477 else if (!strcmp(arg, "--dirstat-by-file"))
3478 return parse_dirstat_opt(options, "files");
3479 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3480 parse_dirstat_opt(options, "files");
3481 return parse_dirstat_opt(options, arg + 18);
3482 }
3483 else if (!strcmp(arg, "--check"))
3484 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3485 else if (!strcmp(arg, "--summary"))
3486 options->output_format |= DIFF_FORMAT_SUMMARY;
3487 else if (!strcmp(arg, "--patch-with-stat"))
3488 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3489 else if (!strcmp(arg, "--name-only"))
3490 options->output_format |= DIFF_FORMAT_NAME;
3491 else if (!strcmp(arg, "--name-status"))
3492 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3493 else if (!strcmp(arg, "-s"))
3494 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3495 else if (!prefixcmp(arg, "--stat"))
3496 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3497 return stat_opt(options, av);
3498
3499 /* renames options */
3500 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3501 !strcmp(arg, "--break-rewrites")) {
3502 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3503 return error("invalid argument to -B: %s", arg+2);
3504 }
3505 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3506 !strcmp(arg, "--find-renames")) {
3507 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3508 return error("invalid argument to -M: %s", arg+2);
3509 options->detect_rename = DIFF_DETECT_RENAME;
3510 }
3511 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3512 options->irreversible_delete = 1;
3513 }
3514 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3515 !strcmp(arg, "--find-copies")) {
3516 if (options->detect_rename == DIFF_DETECT_COPY)
3517 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3518 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3519 return error("invalid argument to -C: %s", arg+2);
3520 options->detect_rename = DIFF_DETECT_COPY;
3521 }
3522 else if (!strcmp(arg, "--no-renames"))
3523 options->detect_rename = 0;
3524 else if (!strcmp(arg, "--rename-empty"))
3525 DIFF_OPT_SET(options, RENAME_EMPTY);
3526 else if (!strcmp(arg, "--no-rename-empty"))
3527 DIFF_OPT_CLR(options, RENAME_EMPTY);
3528 else if (!strcmp(arg, "--relative"))
3529 DIFF_OPT_SET(options, RELATIVE_NAME);
3530 else if (!prefixcmp(arg, "--relative=")) {
3531 DIFF_OPT_SET(options, RELATIVE_NAME);
3532 options->prefix = arg + 11;
3533 }
3534
3535 /* xdiff options */
3536 else if (!strcmp(arg, "--minimal"))
3537 DIFF_XDL_SET(options, NEED_MINIMAL);
3538 else if (!strcmp(arg, "--no-minimal"))
3539 DIFF_XDL_CLR(options, NEED_MINIMAL);
3540 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3541 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3542 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3543 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3544 else if (!strcmp(arg, "--ignore-space-at-eol"))
3545 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3546 else if (!strcmp(arg, "--patience"))
3547 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3548 else if (!strcmp(arg, "--histogram"))
3549 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3550
3551 /* flags options */
3552 else if (!strcmp(arg, "--binary")) {
3553 options->output_format |= DIFF_FORMAT_PATCH;
3554 DIFF_OPT_SET(options, BINARY);
3555 }
3556 else if (!strcmp(arg, "--full-index"))
3557 DIFF_OPT_SET(options, FULL_INDEX);
3558 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3559 DIFF_OPT_SET(options, TEXT);
3560 else if (!strcmp(arg, "-R"))
3561 DIFF_OPT_SET(options, REVERSE_DIFF);
3562 else if (!strcmp(arg, "--find-copies-harder"))
3563 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3564 else if (!strcmp(arg, "--follow"))
3565 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3566 else if (!strcmp(arg, "--color"))
3567 options->use_color = 1;
3568 else if (!prefixcmp(arg, "--color=")) {
3569 int value = git_config_colorbool(NULL, arg+8);
3570 if (value < 0)
3571 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3572 options->use_color = value;
3573 }
3574 else if (!strcmp(arg, "--no-color"))
3575 options->use_color = 0;
3576 else if (!strcmp(arg, "--color-words")) {
3577 options->use_color = 1;
3578 options->word_diff = DIFF_WORDS_COLOR;
3579 }
3580 else if (!prefixcmp(arg, "--color-words=")) {
3581 options->use_color = 1;
3582 options->word_diff = DIFF_WORDS_COLOR;
3583 options->word_regex = arg + 14;
3584 }
3585 else if (!strcmp(arg, "--word-diff")) {
3586 if (options->word_diff == DIFF_WORDS_NONE)
3587 options->word_diff = DIFF_WORDS_PLAIN;
3588 }
3589 else if (!prefixcmp(arg, "--word-diff=")) {
3590 const char *type = arg + 12;
3591 if (!strcmp(type, "plain"))
3592 options->word_diff = DIFF_WORDS_PLAIN;
3593 else if (!strcmp(type, "color")) {
3594 options->use_color = 1;
3595 options->word_diff = DIFF_WORDS_COLOR;
3596 }
3597 else if (!strcmp(type, "porcelain"))
3598 options->word_diff = DIFF_WORDS_PORCELAIN;
3599 else if (!strcmp(type, "none"))
3600 options->word_diff = DIFF_WORDS_NONE;
3601 else
3602 die("bad --word-diff argument: %s", type);
3603 }
3604 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3605 if (options->word_diff == DIFF_WORDS_NONE)
3606 options->word_diff = DIFF_WORDS_PLAIN;
3607 options->word_regex = optarg;
3608 return argcount;
3609 }
3610 else if (!strcmp(arg, "--exit-code"))
3611 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3612 else if (!strcmp(arg, "--quiet"))
3613 DIFF_OPT_SET(options, QUICK);
3614 else if (!strcmp(arg, "--ext-diff"))
3615 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3616 else if (!strcmp(arg, "--no-ext-diff"))
3617 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3618 else if (!strcmp(arg, "--textconv"))
3619 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3620 else if (!strcmp(arg, "--no-textconv"))
3621 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3622 else if (!strcmp(arg, "--ignore-submodules")) {
3623 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3624 handle_ignore_submodules_arg(options, "all");
3625 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3626 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3627 handle_ignore_submodules_arg(options, arg + 20);
3628 } else if (!strcmp(arg, "--submodule"))
3629 DIFF_OPT_SET(options, SUBMODULE_LOG);
3630 else if (!prefixcmp(arg, "--submodule=")) {
3631 if (!strcmp(arg + 12, "log"))
3632 DIFF_OPT_SET(options, SUBMODULE_LOG);
3633 }
3634
3635 /* misc options */
3636 else if (!strcmp(arg, "-z"))
3637 options->line_termination = 0;
3638 else if ((argcount = short_opt('l', av, &optarg))) {
3639 options->rename_limit = strtoul(optarg, NULL, 10);
3640 return argcount;
3641 }
3642 else if ((argcount = short_opt('S', av, &optarg))) {
3643 options->pickaxe = optarg;
3644 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3645 return argcount;
3646 } else if ((argcount = short_opt('G', av, &optarg))) {
3647 options->pickaxe = optarg;
3648 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3649 return argcount;
3650 }
3651 else if (!strcmp(arg, "--pickaxe-all"))
3652 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3653 else if (!strcmp(arg, "--pickaxe-regex"))
3654 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3655 else if ((argcount = short_opt('O', av, &optarg))) {
3656 options->orderfile = optarg;
3657 return argcount;
3658 }
3659 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3660 options->filter = optarg;
3661 return argcount;
3662 }
3663 else if (!strcmp(arg, "--abbrev"))
3664 options->abbrev = DEFAULT_ABBREV;
3665 else if (!prefixcmp(arg, "--abbrev=")) {
3666 options->abbrev = strtoul(arg + 9, NULL, 10);
3667 if (options->abbrev < MINIMUM_ABBREV)
3668 options->abbrev = MINIMUM_ABBREV;
3669 else if (40 < options->abbrev)
3670 options->abbrev = 40;
3671 }
3672 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3673 options->a_prefix = optarg;
3674 return argcount;
3675 }
3676 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3677 options->b_prefix = optarg;
3678 return argcount;
3679 }
3680 else if (!strcmp(arg, "--no-prefix"))
3681 options->a_prefix = options->b_prefix = "";
3682 else if (opt_arg(arg, '\0', "inter-hunk-context",
3683 &options->interhunkcontext))
3684 ;
3685 else if (!strcmp(arg, "-W"))
3686 DIFF_OPT_SET(options, FUNCCONTEXT);
3687 else if (!strcmp(arg, "--function-context"))
3688 DIFF_OPT_SET(options, FUNCCONTEXT);
3689 else if (!strcmp(arg, "--no-function-context"))
3690 DIFF_OPT_CLR(options, FUNCCONTEXT);
3691 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3692 options->file = fopen(optarg, "w");
3693 if (!options->file)
3694 die_errno("Could not open '%s'", optarg);
3695 options->close_file = 1;
3696 return argcount;
3697 } else
3698 return 0;
3699 return 1;
3700 }
3701
3702 int parse_rename_score(const char **cp_p)
3703 {
3704 unsigned long num, scale;
3705 int ch, dot;
3706 const char *cp = *cp_p;
3707
3708 num = 0;
3709 scale = 1;
3710 dot = 0;
3711 for (;;) {
3712 ch = *cp;
3713 if ( !dot && ch == '.' ) {
3714 scale = 1;
3715 dot = 1;
3716 } else if ( ch == '%' ) {
3717 scale = dot ? scale*100 : 100;
3718 cp++; /* % is always at the end */
3719 break;
3720 } else if ( ch >= '0' && ch <= '9' ) {
3721 if ( scale < 100000 ) {
3722 scale *= 10;
3723 num = (num*10) + (ch-'0');
3724 }
3725 } else {
3726 break;
3727 }
3728 cp++;
3729 }
3730 *cp_p = cp;
3731
3732 /* user says num divided by scale and we say internally that
3733 * is MAX_SCORE * num / scale.
3734 */
3735 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3736 }
3737
3738 static int diff_scoreopt_parse(const char *opt)
3739 {
3740 int opt1, opt2, cmd;
3741
3742 if (*opt++ != '-')
3743 return -1;
3744 cmd = *opt++;
3745 if (cmd == '-') {
3746 /* convert the long-form arguments into short-form versions */
3747 if (!prefixcmp(opt, "break-rewrites")) {
3748 opt += strlen("break-rewrites");
3749 if (*opt == 0 || *opt++ == '=')
3750 cmd = 'B';
3751 } else if (!prefixcmp(opt, "find-copies")) {
3752 opt += strlen("find-copies");
3753 if (*opt == 0 || *opt++ == '=')
3754 cmd = 'C';
3755 } else if (!prefixcmp(opt, "find-renames")) {
3756 opt += strlen("find-renames");
3757 if (*opt == 0 || *opt++ == '=')
3758 cmd = 'M';
3759 }
3760 }
3761 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3762 return -1; /* that is not a -M, -C nor -B option */
3763
3764 opt1 = parse_rename_score(&opt);
3765 if (cmd != 'B')
3766 opt2 = 0;
3767 else {
3768 if (*opt == 0)
3769 opt2 = 0;
3770 else if (*opt != '/')
3771 return -1; /* we expect -B80/99 or -B80 */
3772 else {
3773 opt++;
3774 opt2 = parse_rename_score(&opt);
3775 }
3776 }
3777 if (*opt != 0)
3778 return -1;
3779 return opt1 | (opt2 << 16);
3780 }
3781
3782 struct diff_queue_struct diff_queued_diff;
3783
3784 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3785 {
3786 if (queue->alloc <= queue->nr) {
3787 queue->alloc = alloc_nr(queue->alloc);
3788 queue->queue = xrealloc(queue->queue,
3789 sizeof(dp) * queue->alloc);
3790 }
3791 queue->queue[queue->nr++] = dp;
3792 }
3793
3794 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3795 struct diff_filespec *one,
3796 struct diff_filespec *two)
3797 {
3798 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3799 dp->one = one;
3800 dp->two = two;
3801 if (queue)
3802 diff_q(queue, dp);
3803 return dp;
3804 }
3805
3806 void diff_free_filepair(struct diff_filepair *p)
3807 {
3808 free_filespec(p->one);
3809 free_filespec(p->two);
3810 free(p);
3811 }
3812
3813 /* This is different from find_unique_abbrev() in that
3814 * it stuffs the result with dots for alignment.
3815 */
3816 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3817 {
3818 int abblen;
3819 const char *abbrev;
3820 if (len == 40)
3821 return sha1_to_hex(sha1);
3822
3823 abbrev = find_unique_abbrev(sha1, len);
3824 abblen = strlen(abbrev);
3825 if (abblen < 37) {
3826 static char hex[41];
3827 if (len < abblen && abblen <= len + 2)
3828 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3829 else
3830 sprintf(hex, "%s...", abbrev);
3831 return hex;
3832 }
3833 return sha1_to_hex(sha1);
3834 }
3835
3836 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3837 {
3838 int line_termination = opt->line_termination;
3839 int inter_name_termination = line_termination ? '\t' : '\0';
3840 if (opt->output_prefix) {
3841 struct strbuf *msg = NULL;
3842 msg = opt->output_prefix(opt, opt->output_prefix_data);
3843 fprintf(opt->file, "%s", msg->buf);
3844 }
3845
3846 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3847 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3848 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3849 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3850 }
3851 if (p->score) {
3852 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3853 inter_name_termination);
3854 } else {
3855 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3856 }
3857
3858 if (p->status == DIFF_STATUS_COPIED ||
3859 p->status == DIFF_STATUS_RENAMED) {
3860 const char *name_a, *name_b;
3861 name_a = p->one->path;
3862 name_b = p->two->path;
3863 strip_prefix(opt->prefix_length, &name_a, &name_b);
3864 write_name_quoted(name_a, opt->file, inter_name_termination);
3865 write_name_quoted(name_b, opt->file, line_termination);
3866 } else {
3867 const char *name_a, *name_b;
3868 name_a = p->one->mode ? p->one->path : p->two->path;
3869 name_b = NULL;
3870 strip_prefix(opt->prefix_length, &name_a, &name_b);
3871 write_name_quoted(name_a, opt->file, line_termination);
3872 }
3873 }
3874
3875 int diff_unmodified_pair(struct diff_filepair *p)
3876 {
3877 /* This function is written stricter than necessary to support
3878 * the currently implemented transformers, but the idea is to
3879 * let transformers to produce diff_filepairs any way they want,
3880 * and filter and clean them up here before producing the output.
3881 */
3882 struct diff_filespec *one = p->one, *two = p->two;
3883
3884 if (DIFF_PAIR_UNMERGED(p))
3885 return 0; /* unmerged is interesting */
3886
3887 /* deletion, addition, mode or type change
3888 * and rename are all interesting.
3889 */
3890 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3891 DIFF_PAIR_MODE_CHANGED(p) ||
3892 strcmp(one->path, two->path))
3893 return 0;
3894
3895 /* both are valid and point at the same path. that is, we are
3896 * dealing with a change.
3897 */
3898 if (one->sha1_valid && two->sha1_valid &&
3899 !hashcmp(one->sha1, two->sha1) &&
3900 !one->dirty_submodule && !two->dirty_submodule)
3901 return 1; /* no change */
3902 if (!one->sha1_valid && !two->sha1_valid)
3903 return 1; /* both look at the same file on the filesystem. */
3904 return 0;
3905 }
3906
3907 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3908 {
3909 if (diff_unmodified_pair(p))
3910 return;
3911
3912 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3913 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3914 return; /* no tree diffs in patch format */
3915
3916 run_diff(p, o);
3917 }
3918
3919 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3920 struct diffstat_t *diffstat)
3921 {
3922 if (diff_unmodified_pair(p))
3923 return;
3924
3925 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3926 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3927 return; /* no useful stat for tree diffs */
3928
3929 run_diffstat(p, o, diffstat);
3930 }
3931
3932 static void diff_flush_checkdiff(struct diff_filepair *p,
3933 struct diff_options *o)
3934 {
3935 if (diff_unmodified_pair(p))
3936 return;
3937
3938 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3939 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3940 return; /* nothing to check in tree diffs */
3941
3942 run_checkdiff(p, o);
3943 }
3944
3945 int diff_queue_is_empty(void)
3946 {
3947 struct diff_queue_struct *q = &diff_queued_diff;
3948 int i;
3949 for (i = 0; i < q->nr; i++)
3950 if (!diff_unmodified_pair(q->queue[i]))
3951 return 0;
3952 return 1;
3953 }
3954
3955 #if DIFF_DEBUG
3956 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3957 {
3958 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3959 x, one ? one : "",
3960 s->path,
3961 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3962 s->mode,
3963 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3964 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3965 x, one ? one : "",
3966 s->size, s->xfrm_flags);
3967 }
3968
3969 void diff_debug_filepair(const struct diff_filepair *p, int i)
3970 {
3971 diff_debug_filespec(p->one, i, "one");
3972 diff_debug_filespec(p->two, i, "two");
3973 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3974 p->score, p->status ? p->status : '?',
3975 p->one->rename_used, p->broken_pair);
3976 }
3977
3978 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3979 {
3980 int i;
3981 if (msg)
3982 fprintf(stderr, "%s\n", msg);
3983 fprintf(stderr, "q->nr = %d\n", q->nr);
3984 for (i = 0; i < q->nr; i++) {
3985 struct diff_filepair *p = q->queue[i];
3986 diff_debug_filepair(p, i);
3987 }
3988 }
3989 #endif
3990
3991 static void diff_resolve_rename_copy(void)
3992 {
3993 int i;
3994 struct diff_filepair *p;
3995 struct diff_queue_struct *q = &diff_queued_diff;
3996
3997 diff_debug_queue("resolve-rename-copy", q);
3998
3999 for (i = 0; i < q->nr; i++) {
4000 p = q->queue[i];
4001 p->status = 0; /* undecided */
4002 if (DIFF_PAIR_UNMERGED(p))
4003 p->status = DIFF_STATUS_UNMERGED;
4004 else if (!DIFF_FILE_VALID(p->one))
4005 p->status = DIFF_STATUS_ADDED;
4006 else if (!DIFF_FILE_VALID(p->two))
4007 p->status = DIFF_STATUS_DELETED;
4008 else if (DIFF_PAIR_TYPE_CHANGED(p))
4009 p->status = DIFF_STATUS_TYPE_CHANGED;
4010
4011 /* from this point on, we are dealing with a pair
4012 * whose both sides are valid and of the same type, i.e.
4013 * either in-place edit or rename/copy edit.
4014 */
4015 else if (DIFF_PAIR_RENAME(p)) {
4016 /*
4017 * A rename might have re-connected a broken
4018 * pair up, causing the pathnames to be the
4019 * same again. If so, that's not a rename at
4020 * all, just a modification..
4021 *
4022 * Otherwise, see if this source was used for
4023 * multiple renames, in which case we decrement
4024 * the count, and call it a copy.
4025 */
4026 if (!strcmp(p->one->path, p->two->path))
4027 p->status = DIFF_STATUS_MODIFIED;
4028 else if (--p->one->rename_used > 0)
4029 p->status = DIFF_STATUS_COPIED;
4030 else
4031 p->status = DIFF_STATUS_RENAMED;
4032 }
4033 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4034 p->one->mode != p->two->mode ||
4035 p->one->dirty_submodule ||
4036 p->two->dirty_submodule ||
4037 is_null_sha1(p->one->sha1))
4038 p->status = DIFF_STATUS_MODIFIED;
4039 else {
4040 /* This is a "no-change" entry and should not
4041 * happen anymore, but prepare for broken callers.
4042 */
4043 error("feeding unmodified %s to diffcore",
4044 p->one->path);
4045 p->status = DIFF_STATUS_UNKNOWN;
4046 }
4047 }
4048 diff_debug_queue("resolve-rename-copy done", q);
4049 }
4050
4051 static int check_pair_status(struct diff_filepair *p)
4052 {
4053 switch (p->status) {
4054 case DIFF_STATUS_UNKNOWN:
4055 return 0;
4056 case 0:
4057 die("internal error in diff-resolve-rename-copy");
4058 default:
4059 return 1;
4060 }
4061 }
4062
4063 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4064 {
4065 int fmt = opt->output_format;
4066
4067 if (fmt & DIFF_FORMAT_CHECKDIFF)
4068 diff_flush_checkdiff(p, opt);
4069 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4070 diff_flush_raw(p, opt);
4071 else if (fmt & DIFF_FORMAT_NAME) {
4072 const char *name_a, *name_b;
4073 name_a = p->two->path;
4074 name_b = NULL;
4075 strip_prefix(opt->prefix_length, &name_a, &name_b);
4076 write_name_quoted(name_a, opt->file, opt->line_termination);
4077 }
4078 }
4079
4080 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4081 {
4082 if (fs->mode)
4083 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4084 else
4085 fprintf(file, " %s ", newdelete);
4086 write_name_quoted(fs->path, file, '\n');
4087 }
4088
4089
4090 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4091 const char *line_prefix)
4092 {
4093 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4094 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4095 p->two->mode, show_name ? ' ' : '\n');
4096 if (show_name) {
4097 write_name_quoted(p->two->path, file, '\n');
4098 }
4099 }
4100 }
4101
4102 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4103 const char *line_prefix)
4104 {
4105 char *names = pprint_rename(p->one->path, p->two->path);
4106
4107 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4108 free(names);
4109 show_mode_change(file, p, 0, line_prefix);
4110 }
4111
4112 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4113 {
4114 FILE *file = opt->file;
4115 char *line_prefix = "";
4116
4117 if (opt->output_prefix) {
4118 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4119 line_prefix = buf->buf;
4120 }
4121
4122 switch(p->status) {
4123 case DIFF_STATUS_DELETED:
4124 fputs(line_prefix, file);
4125 show_file_mode_name(file, "delete", p->one);
4126 break;
4127 case DIFF_STATUS_ADDED:
4128 fputs(line_prefix, file);
4129 show_file_mode_name(file, "create", p->two);
4130 break;
4131 case DIFF_STATUS_COPIED:
4132 fputs(line_prefix, file);
4133 show_rename_copy(file, "copy", p, line_prefix);
4134 break;
4135 case DIFF_STATUS_RENAMED:
4136 fputs(line_prefix, file);
4137 show_rename_copy(file, "rename", p, line_prefix);
4138 break;
4139 default:
4140 if (p->score) {
4141 fprintf(file, "%s rewrite ", line_prefix);
4142 write_name_quoted(p->two->path, file, ' ');
4143 fprintf(file, "(%d%%)\n", similarity_index(p));
4144 }
4145 show_mode_change(file, p, !p->score, line_prefix);
4146 break;
4147 }
4148 }
4149
4150 struct patch_id_t {
4151 git_SHA_CTX *ctx;
4152 int patchlen;
4153 };
4154
4155 static int remove_space(char *line, int len)
4156 {
4157 int i;
4158 char *dst = line;
4159 unsigned char c;
4160
4161 for (i = 0; i < len; i++)
4162 if (!isspace((c = line[i])))
4163 *dst++ = c;
4164
4165 return dst - line;
4166 }
4167
4168 static void patch_id_consume(void *priv, char *line, unsigned long len)
4169 {
4170 struct patch_id_t *data = priv;
4171 int new_len;
4172
4173 /* Ignore line numbers when computing the SHA1 of the patch */
4174 if (!prefixcmp(line, "@@ -"))
4175 return;
4176
4177 new_len = remove_space(line, len);
4178
4179 git_SHA1_Update(data->ctx, line, new_len);
4180 data->patchlen += new_len;
4181 }
4182
4183 /* returns 0 upon success, and writes result into sha1 */
4184 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4185 {
4186 struct diff_queue_struct *q = &diff_queued_diff;
4187 int i;
4188 git_SHA_CTX ctx;
4189 struct patch_id_t data;
4190 char buffer[PATH_MAX * 4 + 20];
4191
4192 git_SHA1_Init(&ctx);
4193 memset(&data, 0, sizeof(struct patch_id_t));
4194 data.ctx = &ctx;
4195
4196 for (i = 0; i < q->nr; i++) {
4197 xpparam_t xpp;
4198 xdemitconf_t xecfg;
4199 mmfile_t mf1, mf2;
4200 struct diff_filepair *p = q->queue[i];
4201 int len1, len2;
4202
4203 memset(&xpp, 0, sizeof(xpp));
4204 memset(&xecfg, 0, sizeof(xecfg));
4205 if (p->status == 0)
4206 return error("internal diff status error");
4207 if (p->status == DIFF_STATUS_UNKNOWN)
4208 continue;
4209 if (diff_unmodified_pair(p))
4210 continue;
4211 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4212 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4213 continue;
4214 if (DIFF_PAIR_UNMERGED(p))
4215 continue;
4216
4217 diff_fill_sha1_info(p->one);
4218 diff_fill_sha1_info(p->two);
4219 if (fill_mmfile(&mf1, p->one) < 0 ||
4220 fill_mmfile(&mf2, p->two) < 0)
4221 return error("unable to read files to diff");
4222
4223 len1 = remove_space(p->one->path, strlen(p->one->path));
4224 len2 = remove_space(p->two->path, strlen(p->two->path));
4225 if (p->one->mode == 0)
4226 len1 = snprintf(buffer, sizeof(buffer),
4227 "diff--gita/%.*sb/%.*s"
4228 "newfilemode%06o"
4229 "---/dev/null"
4230 "+++b/%.*s",
4231 len1, p->one->path,
4232 len2, p->two->path,
4233 p->two->mode,
4234 len2, p->two->path);
4235 else if (p->two->mode == 0)
4236 len1 = snprintf(buffer, sizeof(buffer),
4237 "diff--gita/%.*sb/%.*s"
4238 "deletedfilemode%06o"
4239 "---a/%.*s"
4240 "+++/dev/null",
4241 len1, p->one->path,
4242 len2, p->two->path,
4243 p->one->mode,
4244 len1, p->one->path);
4245 else
4246 len1 = snprintf(buffer, sizeof(buffer),
4247 "diff--gita/%.*sb/%.*s"
4248 "---a/%.*s"
4249 "+++b/%.*s",
4250 len1, p->one->path,
4251 len2, p->two->path,
4252 len1, p->one->path,
4253 len2, p->two->path);
4254 git_SHA1_Update(&ctx, buffer, len1);
4255
4256 if (diff_filespec_is_binary(p->one) ||
4257 diff_filespec_is_binary(p->two)) {
4258 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4259 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4260 continue;
4261 }
4262
4263 xpp.flags = 0;
4264 xecfg.ctxlen = 3;
4265 xecfg.flags = 0;
4266 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4267 &xpp, &xecfg);
4268 }
4269
4270 git_SHA1_Final(sha1, &ctx);
4271 return 0;
4272 }
4273
4274 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4275 {
4276 struct diff_queue_struct *q = &diff_queued_diff;
4277 int i;
4278 int result = diff_get_patch_id(options, sha1);
4279
4280 for (i = 0; i < q->nr; i++)
4281 diff_free_filepair(q->queue[i]);
4282
4283 free(q->queue);
4284 DIFF_QUEUE_CLEAR(q);
4285
4286 return result;
4287 }
4288
4289 static int is_summary_empty(const struct diff_queue_struct *q)
4290 {
4291 int i;
4292
4293 for (i = 0; i < q->nr; i++) {
4294 const struct diff_filepair *p = q->queue[i];
4295
4296 switch (p->status) {
4297 case DIFF_STATUS_DELETED:
4298 case DIFF_STATUS_ADDED:
4299 case DIFF_STATUS_COPIED:
4300 case DIFF_STATUS_RENAMED:
4301 return 0;
4302 default:
4303 if (p->score)
4304 return 0;
4305 if (p->one->mode && p->two->mode &&
4306 p->one->mode != p->two->mode)
4307 return 0;
4308 break;
4309 }
4310 }
4311 return 1;
4312 }
4313
4314 static const char rename_limit_warning[] =
4315 "inexact rename detection was skipped due to too many files.";
4316
4317 static const char degrade_cc_to_c_warning[] =
4318 "only found copies from modified paths due to too many files.";
4319
4320 static const char rename_limit_advice[] =
4321 "you may want to set your %s variable to at least "
4322 "%d and retry the command.";
4323
4324 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4325 {
4326 if (degraded_cc)
4327 warning(degrade_cc_to_c_warning);
4328 else if (needed)
4329 warning(rename_limit_warning);
4330 else
4331 return;
4332 if (0 < needed && needed < 32767)
4333 warning(rename_limit_advice, varname, needed);
4334 }
4335
4336 void diff_flush(struct diff_options *options)
4337 {
4338 struct diff_queue_struct *q = &diff_queued_diff;
4339 int i, output_format = options->output_format;
4340 int separator = 0;
4341 int dirstat_by_line = 0;
4342
4343 /*
4344 * Order: raw, stat, summary, patch
4345 * or: name/name-status/checkdiff (other bits clear)
4346 */
4347 if (!q->nr)
4348 goto free_queue;
4349
4350 if (output_format & (DIFF_FORMAT_RAW |
4351 DIFF_FORMAT_NAME |
4352 DIFF_FORMAT_NAME_STATUS |
4353 DIFF_FORMAT_CHECKDIFF)) {
4354 for (i = 0; i < q->nr; i++) {
4355 struct diff_filepair *p = q->queue[i];
4356 if (check_pair_status(p))
4357 flush_one_pair(p, options);
4358 }
4359 separator++;
4360 }
4361
4362 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4363 dirstat_by_line = 1;
4364
4365 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4366 dirstat_by_line) {
4367 struct diffstat_t diffstat;
4368
4369 memset(&diffstat, 0, sizeof(struct diffstat_t));
4370 for (i = 0; i < q->nr; i++) {
4371 struct diff_filepair *p = q->queue[i];
4372 if (check_pair_status(p))
4373 diff_flush_stat(p, options, &diffstat);
4374 }
4375 if (output_format & DIFF_FORMAT_NUMSTAT)
4376 show_numstat(&diffstat, options);
4377 if (output_format & DIFF_FORMAT_DIFFSTAT)
4378 show_stats(&diffstat, options);
4379 if (output_format & DIFF_FORMAT_SHORTSTAT)
4380 show_shortstats(&diffstat, options);
4381 if (output_format & DIFF_FORMAT_DIRSTAT)
4382 show_dirstat_by_line(&diffstat, options);
4383 free_diffstat_info(&diffstat);
4384 separator++;
4385 }
4386 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4387 show_dirstat(options);
4388
4389 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4390 for (i = 0; i < q->nr; i++) {
4391 diff_summary(options, q->queue[i]);
4392 }
4393 separator++;
4394 }
4395
4396 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4397 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4398 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4399 /*
4400 * run diff_flush_patch for the exit status. setting
4401 * options->file to /dev/null should be safe, becaue we
4402 * aren't supposed to produce any output anyway.
4403 */
4404 if (options->close_file)
4405 fclose(options->file);
4406 options->file = fopen("/dev/null", "w");
4407 if (!options->file)
4408 die_errno("Could not open /dev/null");
4409 options->close_file = 1;
4410 for (i = 0; i < q->nr; i++) {
4411 struct diff_filepair *p = q->queue[i];
4412 if (check_pair_status(p))
4413 diff_flush_patch(p, options);
4414 if (options->found_changes)
4415 break;
4416 }
4417 }
4418
4419 if (output_format & DIFF_FORMAT_PATCH) {
4420 if (separator) {
4421 if (options->output_prefix) {
4422 struct strbuf *msg = NULL;
4423 msg = options->output_prefix(options,
4424 options->output_prefix_data);
4425 fwrite(msg->buf, msg->len, 1, stdout);
4426 }
4427 putc(options->line_termination, options->file);
4428 if (options->stat_sep) {
4429 /* attach patch instead of inline */
4430 fputs(options->stat_sep, options->file);
4431 }
4432 }
4433
4434 for (i = 0; i < q->nr; i++) {
4435 struct diff_filepair *p = q->queue[i];
4436 if (check_pair_status(p))
4437 diff_flush_patch(p, options);
4438 }
4439 }
4440
4441 if (output_format & DIFF_FORMAT_CALLBACK)
4442 options->format_callback(q, options, options->format_callback_data);
4443
4444 for (i = 0; i < q->nr; i++)
4445 diff_free_filepair(q->queue[i]);
4446 free_queue:
4447 free(q->queue);
4448 DIFF_QUEUE_CLEAR(q);
4449 if (options->close_file)
4450 fclose(options->file);
4451
4452 /*
4453 * Report the content-level differences with HAS_CHANGES;
4454 * diff_addremove/diff_change does not set the bit when
4455 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4456 */
4457 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4458 if (options->found_changes)
4459 DIFF_OPT_SET(options, HAS_CHANGES);
4460 else
4461 DIFF_OPT_CLR(options, HAS_CHANGES);
4462 }
4463 }
4464
4465 static void diffcore_apply_filter(const char *filter)
4466 {
4467 int i;
4468 struct diff_queue_struct *q = &diff_queued_diff;
4469 struct diff_queue_struct outq;
4470 DIFF_QUEUE_CLEAR(&outq);
4471
4472 if (!filter)
4473 return;
4474
4475 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4476 int found;
4477 for (i = found = 0; !found && i < q->nr; i++) {
4478 struct diff_filepair *p = q->queue[i];
4479 if (((p->status == DIFF_STATUS_MODIFIED) &&
4480 ((p->score &&
4481 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4482 (!p->score &&
4483 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4484 ((p->status != DIFF_STATUS_MODIFIED) &&
4485 strchr(filter, p->status)))
4486 found++;
4487 }
4488 if (found)
4489 return;
4490
4491 /* otherwise we will clear the whole queue
4492 * by copying the empty outq at the end of this
4493 * function, but first clear the current entries
4494 * in the queue.
4495 */
4496 for (i = 0; i < q->nr; i++)
4497 diff_free_filepair(q->queue[i]);
4498 }
4499 else {
4500 /* Only the matching ones */
4501 for (i = 0; i < q->nr; i++) {
4502 struct diff_filepair *p = q->queue[i];
4503
4504 if (((p->status == DIFF_STATUS_MODIFIED) &&
4505 ((p->score &&
4506 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4507 (!p->score &&
4508 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4509 ((p->status != DIFF_STATUS_MODIFIED) &&
4510 strchr(filter, p->status)))
4511 diff_q(&outq, p);
4512 else
4513 diff_free_filepair(p);
4514 }
4515 }
4516 free(q->queue);
4517 *q = outq;
4518 }
4519
4520 /* Check whether two filespecs with the same mode and size are identical */
4521 static int diff_filespec_is_identical(struct diff_filespec *one,
4522 struct diff_filespec *two)
4523 {
4524 if (S_ISGITLINK(one->mode))
4525 return 0;
4526 if (diff_populate_filespec(one, 0))
4527 return 0;
4528 if (diff_populate_filespec(two, 0))
4529 return 0;
4530 return !memcmp(one->data, two->data, one->size);
4531 }
4532
4533 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4534 {
4535 int i;
4536 struct diff_queue_struct *q = &diff_queued_diff;
4537 struct diff_queue_struct outq;
4538 DIFF_QUEUE_CLEAR(&outq);
4539
4540 for (i = 0; i < q->nr; i++) {
4541 struct diff_filepair *p = q->queue[i];
4542
4543 /*
4544 * 1. Entries that come from stat info dirtiness
4545 * always have both sides (iow, not create/delete),
4546 * one side of the object name is unknown, with
4547 * the same mode and size. Keep the ones that
4548 * do not match these criteria. They have real
4549 * differences.
4550 *
4551 * 2. At this point, the file is known to be modified,
4552 * with the same mode and size, and the object
4553 * name of one side is unknown. Need to inspect
4554 * the identical contents.
4555 */
4556 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4557 !DIFF_FILE_VALID(p->two) ||
4558 (p->one->sha1_valid && p->two->sha1_valid) ||
4559 (p->one->mode != p->two->mode) ||
4560 diff_populate_filespec(p->one, 1) ||
4561 diff_populate_filespec(p->two, 1) ||
4562 (p->one->size != p->two->size) ||
4563 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4564 diff_q(&outq, p);
4565 else {
4566 /*
4567 * The caller can subtract 1 from skip_stat_unmatch
4568 * to determine how many paths were dirty only
4569 * due to stat info mismatch.
4570 */
4571 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4572 diffopt->skip_stat_unmatch++;
4573 diff_free_filepair(p);
4574 }
4575 }
4576 free(q->queue);
4577 *q = outq;
4578 }
4579
4580 static int diffnamecmp(const void *a_, const void *b_)
4581 {
4582 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4583 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4584 const char *name_a, *name_b;
4585
4586 name_a = a->one ? a->one->path : a->two->path;
4587 name_b = b->one ? b->one->path : b->two->path;
4588 return strcmp(name_a, name_b);
4589 }
4590
4591 void diffcore_fix_diff_index(struct diff_options *options)
4592 {
4593 struct diff_queue_struct *q = &diff_queued_diff;
4594 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4595 }
4596
4597 void diffcore_std(struct diff_options *options)
4598 {
4599 if (options->skip_stat_unmatch)
4600 diffcore_skip_stat_unmatch(options);
4601 if (!options->found_follow) {
4602 /* See try_to_follow_renames() in tree-diff.c */
4603 if (options->break_opt != -1)
4604 diffcore_break(options->break_opt);
4605 if (options->detect_rename)
4606 diffcore_rename(options);
4607 if (options->break_opt != -1)
4608 diffcore_merge_broken();
4609 }
4610 if (options->pickaxe)
4611 diffcore_pickaxe(options);
4612 if (options->orderfile)
4613 diffcore_order(options->orderfile);
4614 if (!options->found_follow)
4615 /* See try_to_follow_renames() in tree-diff.c */
4616 diff_resolve_rename_copy();
4617 diffcore_apply_filter(options->filter);
4618
4619 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4620 DIFF_OPT_SET(options, HAS_CHANGES);
4621 else
4622 DIFF_OPT_CLR(options, HAS_CHANGES);
4623
4624 options->found_follow = 0;
4625 }
4626
4627 int diff_result_code(struct diff_options *opt, int status)
4628 {
4629 int result = 0;
4630
4631 diff_warn_rename_limit("diff.renamelimit",
4632 opt->needed_rename_limit,
4633 opt->degraded_cc_to_c);
4634 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4635 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4636 return status;
4637 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4638 DIFF_OPT_TST(opt, HAS_CHANGES))
4639 result |= 01;
4640 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4641 DIFF_OPT_TST(opt, CHECK_FAILED))
4642 result |= 02;
4643 return result;
4644 }
4645
4646 int diff_can_quit_early(struct diff_options *opt)
4647 {
4648 return (DIFF_OPT_TST(opt, QUICK) &&
4649 !opt->filter &&
4650 DIFF_OPT_TST(opt, HAS_CHANGES));
4651 }
4652
4653 /*
4654 * Shall changes to this submodule be ignored?
4655 *
4656 * Submodule changes can be configured to be ignored separately for each path,
4657 * but that configuration can be overridden from the command line.
4658 */
4659 static int is_submodule_ignored(const char *path, struct diff_options *options)
4660 {
4661 int ignored = 0;
4662 unsigned orig_flags = options->flags;
4663 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4664 set_diffopt_flags_from_submodule_config(options, path);
4665 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4666 ignored = 1;
4667 options->flags = orig_flags;
4668 return ignored;
4669 }
4670
4671 void diff_addremove(struct diff_options *options,
4672 int addremove, unsigned mode,
4673 const unsigned char *sha1,
4674 const char *concatpath, unsigned dirty_submodule)
4675 {
4676 struct diff_filespec *one, *two;
4677
4678 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4679 return;
4680
4681 /* This may look odd, but it is a preparation for
4682 * feeding "there are unchanged files which should
4683 * not produce diffs, but when you are doing copy
4684 * detection you would need them, so here they are"
4685 * entries to the diff-core. They will be prefixed
4686 * with something like '=' or '*' (I haven't decided
4687 * which but should not make any difference).
4688 * Feeding the same new and old to diff_change()
4689 * also has the same effect.
4690 * Before the final output happens, they are pruned after
4691 * merged into rename/copy pairs as appropriate.
4692 */
4693 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4694 addremove = (addremove == '+' ? '-' :
4695 addremove == '-' ? '+' : addremove);
4696
4697 if (options->prefix &&
4698 strncmp(concatpath, options->prefix, options->prefix_length))
4699 return;
4700
4701 one = alloc_filespec(concatpath);
4702 two = alloc_filespec(concatpath);
4703
4704 if (addremove != '+')
4705 fill_filespec(one, sha1, mode);
4706 if (addremove != '-') {
4707 fill_filespec(two, sha1, mode);
4708 two->dirty_submodule = dirty_submodule;
4709 }
4710
4711 diff_queue(&diff_queued_diff, one, two);
4712 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4713 DIFF_OPT_SET(options, HAS_CHANGES);
4714 }
4715
4716 void diff_change(struct diff_options *options,
4717 unsigned old_mode, unsigned new_mode,
4718 const unsigned char *old_sha1,
4719 const unsigned char *new_sha1,
4720 const char *concatpath,
4721 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4722 {
4723 struct diff_filespec *one, *two;
4724
4725 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4726 is_submodule_ignored(concatpath, options))
4727 return;
4728
4729 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4730 unsigned tmp;
4731 const unsigned char *tmp_c;
4732 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4733 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4734 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4735 new_dirty_submodule = tmp;
4736 }
4737
4738 if (options->prefix &&
4739 strncmp(concatpath, options->prefix, options->prefix_length))
4740 return;
4741
4742 one = alloc_filespec(concatpath);
4743 two = alloc_filespec(concatpath);
4744 fill_filespec(one, old_sha1, old_mode);
4745 fill_filespec(two, new_sha1, new_mode);
4746 one->dirty_submodule = old_dirty_submodule;
4747 two->dirty_submodule = new_dirty_submodule;
4748
4749 diff_queue(&diff_queued_diff, one, two);
4750 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4751 DIFF_OPT_SET(options, HAS_CHANGES);
4752 }
4753
4754 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4755 {
4756 struct diff_filepair *pair;
4757 struct diff_filespec *one, *two;
4758
4759 if (options->prefix &&
4760 strncmp(path, options->prefix, options->prefix_length))
4761 return NULL;
4762
4763 one = alloc_filespec(path);
4764 two = alloc_filespec(path);
4765 pair = diff_queue(&diff_queued_diff, one, two);
4766 pair->is_unmerged = 1;
4767 return pair;
4768 }
4769
4770 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4771 size_t *outsize)
4772 {
4773 struct diff_tempfile *temp;
4774 const char *argv[3];
4775 const char **arg = argv;
4776 struct child_process child;
4777 struct strbuf buf = STRBUF_INIT;
4778 int err = 0;
4779
4780 temp = prepare_temp_file(spec->path, spec);
4781 *arg++ = pgm;
4782 *arg++ = temp->name;
4783 *arg = NULL;
4784
4785 memset(&child, 0, sizeof(child));
4786 child.use_shell = 1;
4787 child.argv = argv;
4788 child.out = -1;
4789 if (start_command(&child)) {
4790 remove_tempfile();
4791 return NULL;
4792 }
4793
4794 if (strbuf_read(&buf, child.out, 0) < 0)
4795 err = error("error reading from textconv command '%s'", pgm);
4796 close(child.out);
4797
4798 if (finish_command(&child) || err) {
4799 strbuf_release(&buf);
4800 remove_tempfile();
4801 return NULL;
4802 }
4803 remove_tempfile();
4804
4805 return strbuf_detach(&buf, outsize);
4806 }
4807
4808 size_t fill_textconv(struct userdiff_driver *driver,
4809 struct diff_filespec *df,
4810 char **outbuf)
4811 {
4812 size_t size;
4813
4814 if (!driver || !driver->textconv) {
4815 if (!DIFF_FILE_VALID(df)) {
4816 *outbuf = "";
4817 return 0;
4818 }
4819 if (diff_populate_filespec(df, 0))
4820 die("unable to read files to diff");
4821 *outbuf = df->data;
4822 return df->size;
4823 }
4824
4825 if (driver->textconv_cache && df->sha1_valid) {
4826 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4827 &size);
4828 if (*outbuf)
4829 return size;
4830 }
4831
4832 *outbuf = run_textconv(driver->textconv, df, &size);
4833 if (!*outbuf)
4834 die("unable to read files to diff");
4835
4836 if (driver->textconv_cache && df->sha1_valid) {
4837 /* ignore errors, as we might be in a readonly repository */
4838 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4839 size);
4840 /*
4841 * we could save up changes and flush them all at the end,
4842 * but we would need an extra call after all diffing is done.
4843 * Since generating a cache entry is the slow path anyway,
4844 * this extra overhead probably isn't a big deal.
4845 */
4846 notes_cache_write(driver->textconv_cache);
4847 }
4848
4849 return size;
4850 }
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