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[git/dscho.git] / diff.c
blobb020c070cac15e7448178db67a480fc311f18ad9
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();
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 (options->stat_graph_width &&
1543 graph_width > options->stat_graph_width)
1544 graph_width = options->stat_graph_width;
1545 if (name_width > width - number_width - 6 - graph_width)
1546 name_width = width - number_width - 6 - graph_width;
1547 else
1548 graph_width = width - number_width - 6 - name_width;
1549 }
1550
1551 /*
1552 * From here name_width is the width of the name area,
1553 * and graph_width is the width of the graph area.
1554 * max_change is used to scale graph properly.
1555 */
1556 for (i = 0; i < count; i++) {
1557 const char *prefix = "";
1558 char *name = data->files[i]->print_name;
1559 uintmax_t added = data->files[i]->added;
1560 uintmax_t deleted = data->files[i]->deleted;
1561 int name_len;
1562
1563 if (!data->files[i]->is_renamed &&
1564 (added + deleted == 0)) {
1565 total_files--;
1566 continue;
1567 }
1568 /*
1569 * "scale" the filename
1570 */
1571 len = name_width;
1572 name_len = strlen(name);
1573 if (name_width < name_len) {
1574 char *slash;
1575 prefix = "...";
1576 len -= 3;
1577 name += name_len - len;
1578 slash = strchr(name, '/');
1579 if (slash)
1580 name = slash;
1581 }
1582
1583 if (data->files[i]->is_binary) {
1584 fprintf(options->file, "%s", line_prefix);
1585 show_name(options->file, prefix, name, len);
1586 fprintf(options->file, " Bin ");
1587 fprintf(options->file, "%s%"PRIuMAX"%s",
1588 del_c, deleted, reset);
1589 fprintf(options->file, " -> ");
1590 fprintf(options->file, "%s%"PRIuMAX"%s",
1591 add_c, added, reset);
1592 fprintf(options->file, " bytes");
1593 fprintf(options->file, "\n");
1594 continue;
1595 }
1596 else if (data->files[i]->is_unmerged) {
1597 fprintf(options->file, "%s", line_prefix);
1598 show_name(options->file, prefix, name, len);
1599 fprintf(options->file, " Unmerged\n");
1600 continue;
1601 }
1602
1603 /*
1604 * scale the add/delete
1605 */
1606 add = added;
1607 del = deleted;
1608 adds += add;
1609 dels += del;
1610
1611 if (graph_width <= max_change) {
1612 int total = add + del;
1613
1614 total = scale_linear(add + del, graph_width, max_change);
1615 if (total < 2 && add && del)
1616 /* width >= 2 due to the sanity check */
1617 total = 2;
1618 if (add < del) {
1619 add = scale_linear(add, graph_width, max_change);
1620 del = total - add;
1621 } else {
1622 del = scale_linear(del, graph_width, max_change);
1623 add = total - del;
1624 }
1625 }
1626 fprintf(options->file, "%s", line_prefix);
1627 show_name(options->file, prefix, name, len);
1628 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1629 added + deleted ? " " : "");
1630 show_graph(options->file, '+', add, add_c, reset);
1631 show_graph(options->file, '-', del, del_c, reset);
1632 fprintf(options->file, "\n");
1633 }
1634 for (i = count; i < data->nr; i++) {
1635 uintmax_t added = data->files[i]->added;
1636 uintmax_t deleted = data->files[i]->deleted;
1637 if (!data->files[i]->is_renamed &&
1638 (added + deleted == 0)) {
1639 total_files--;
1640 continue;
1641 }
1642 adds += added;
1643 dels += deleted;
1644 if (!extra_shown)
1645 fprintf(options->file, "%s ...\n", line_prefix);
1646 extra_shown = 1;
1647 }
1648 fprintf(options->file, "%s", line_prefix);
1649 print_stat_summary(options->file, total_files, adds, dels);
1650 }
1651
1652 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1653 {
1654 int i, adds = 0, dels = 0, total_files = data->nr;
1655
1656 if (data->nr == 0)
1657 return;
1658
1659 for (i = 0; i < data->nr; i++) {
1660 if (!data->files[i]->is_binary &&
1661 !data->files[i]->is_unmerged) {
1662 int added = data->files[i]->added;
1663 int deleted= data->files[i]->deleted;
1664 if (!data->files[i]->is_renamed &&
1665 (added + deleted == 0)) {
1666 total_files--;
1667 } else {
1668 adds += added;
1669 dels += deleted;
1670 }
1671 }
1672 }
1673 if (options->output_prefix) {
1674 struct strbuf *msg = NULL;
1675 msg = options->output_prefix(options,
1676 options->output_prefix_data);
1677 fprintf(options->file, "%s", msg->buf);
1678 }
1679 print_stat_summary(options->file, total_files, adds, dels);
1680 }
1681
1682 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1683 {
1684 int i;
1685
1686 if (data->nr == 0)
1687 return;
1688
1689 for (i = 0; i < data->nr; i++) {
1690 struct diffstat_file *file = data->files[i];
1691
1692 if (options->output_prefix) {
1693 struct strbuf *msg = NULL;
1694 msg = options->output_prefix(options,
1695 options->output_prefix_data);
1696 fprintf(options->file, "%s", msg->buf);
1697 }
1698
1699 if (file->is_binary)
1700 fprintf(options->file, "-\t-\t");
1701 else
1702 fprintf(options->file,
1703 "%"PRIuMAX"\t%"PRIuMAX"\t",
1704 file->added, file->deleted);
1705 if (options->line_termination) {
1706 fill_print_name(file);
1707 if (!file->is_renamed)
1708 write_name_quoted(file->name, options->file,
1709 options->line_termination);
1710 else {
1711 fputs(file->print_name, options->file);
1712 putc(options->line_termination, options->file);
1713 }
1714 } else {
1715 if (file->is_renamed) {
1716 putc('\0', options->file);
1717 write_name_quoted(file->from_name, options->file, '\0');
1718 }
1719 write_name_quoted(file->name, options->file, '\0');
1720 }
1721 }
1722 }
1723
1724 struct dirstat_file {
1725 const char *name;
1726 unsigned long changed;
1727 };
1728
1729 struct dirstat_dir {
1730 struct dirstat_file *files;
1731 int alloc, nr, permille, cumulative;
1732 };
1733
1734 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1735 unsigned long changed, const char *base, int baselen)
1736 {
1737 unsigned long this_dir = 0;
1738 unsigned int sources = 0;
1739 const char *line_prefix = "";
1740 struct strbuf *msg = NULL;
1741
1742 if (opt->output_prefix) {
1743 msg = opt->output_prefix(opt, opt->output_prefix_data);
1744 line_prefix = msg->buf;
1745 }
1746
1747 while (dir->nr) {
1748 struct dirstat_file *f = dir->files;
1749 int namelen = strlen(f->name);
1750 unsigned long this;
1751 char *slash;
1752
1753 if (namelen < baselen)
1754 break;
1755 if (memcmp(f->name, base, baselen))
1756 break;
1757 slash = strchr(f->name + baselen, '/');
1758 if (slash) {
1759 int newbaselen = slash + 1 - f->name;
1760 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1761 sources++;
1762 } else {
1763 this = f->changed;
1764 dir->files++;
1765 dir->nr--;
1766 sources += 2;
1767 }
1768 this_dir += this;
1769 }
1770
1771 /*
1772 * We don't report dirstat's for
1773 * - the top level
1774 * - or cases where everything came from a single directory
1775 * under this directory (sources == 1).
1776 */
1777 if (baselen && sources != 1) {
1778 if (this_dir) {
1779 int permille = this_dir * 1000 / changed;
1780 if (permille >= dir->permille) {
1781 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1782 permille / 10, permille % 10, baselen, base);
1783 if (!dir->cumulative)
1784 return 0;
1785 }
1786 }
1787 }
1788 return this_dir;
1789 }
1790
1791 static int dirstat_compare(const void *_a, const void *_b)
1792 {
1793 const struct dirstat_file *a = _a;
1794 const struct dirstat_file *b = _b;
1795 return strcmp(a->name, b->name);
1796 }
1797
1798 static void show_dirstat(struct diff_options *options)
1799 {
1800 int i;
1801 unsigned long changed;
1802 struct dirstat_dir dir;
1803 struct diff_queue_struct *q = &diff_queued_diff;
1804
1805 dir.files = NULL;
1806 dir.alloc = 0;
1807 dir.nr = 0;
1808 dir.permille = options->dirstat_permille;
1809 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1810
1811 changed = 0;
1812 for (i = 0; i < q->nr; i++) {
1813 struct diff_filepair *p = q->queue[i];
1814 const char *name;
1815 unsigned long copied, added, damage;
1816 int content_changed;
1817
1818 name = p->two->path ? p->two->path : p->one->path;
1819
1820 if (p->one->sha1_valid && p->two->sha1_valid)
1821 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1822 else
1823 content_changed = 1;
1824
1825 if (!content_changed) {
1826 /*
1827 * The SHA1 has not changed, so pre-/post-content is
1828 * identical. We can therefore skip looking at the
1829 * file contents altogether.
1830 */
1831 damage = 0;
1832 goto found_damage;
1833 }
1834
1835 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1836 /*
1837 * In --dirstat-by-file mode, we don't really need to
1838 * look at the actual file contents at all.
1839 * The fact that the SHA1 changed is enough for us to
1840 * add this file to the list of results
1841 * (with each file contributing equal damage).
1842 */
1843 damage = 1;
1844 goto found_damage;
1845 }
1846
1847 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1848 diff_populate_filespec(p->one, 0);
1849 diff_populate_filespec(p->two, 0);
1850 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1851 &copied, &added);
1852 diff_free_filespec_data(p->one);
1853 diff_free_filespec_data(p->two);
1854 } else if (DIFF_FILE_VALID(p->one)) {
1855 diff_populate_filespec(p->one, 1);
1856 copied = added = 0;
1857 diff_free_filespec_data(p->one);
1858 } else if (DIFF_FILE_VALID(p->two)) {
1859 diff_populate_filespec(p->two, 1);
1860 copied = 0;
1861 added = p->two->size;
1862 diff_free_filespec_data(p->two);
1863 } else
1864 continue;
1865
1866 /*
1867 * Original minus copied is the removed material,
1868 * added is the new material. They are both damages
1869 * made to the preimage.
1870 * If the resulting damage is zero, we know that
1871 * diffcore_count_changes() considers the two entries to
1872 * be identical, but since content_changed is true, we
1873 * know that there must have been _some_ kind of change,
1874 * so we force all entries to have damage > 0.
1875 */
1876 damage = (p->one->size - copied) + added;
1877 if (!damage)
1878 damage = 1;
1879
1880 found_damage:
1881 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1882 dir.files[dir.nr].name = name;
1883 dir.files[dir.nr].changed = damage;
1884 changed += damage;
1885 dir.nr++;
1886 }
1887
1888 /* This can happen even with many files, if everything was renames */
1889 if (!changed)
1890 return;
1891
1892 /* Show all directories with more than x% of the changes */
1893 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1894 gather_dirstat(options, &dir, changed, "", 0);
1895 }
1896
1897 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1898 {
1899 int i;
1900 unsigned long changed;
1901 struct dirstat_dir dir;
1902
1903 if (data->nr == 0)
1904 return;
1905
1906 dir.files = NULL;
1907 dir.alloc = 0;
1908 dir.nr = 0;
1909 dir.permille = options->dirstat_permille;
1910 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1911
1912 changed = 0;
1913 for (i = 0; i < data->nr; i++) {
1914 struct diffstat_file *file = data->files[i];
1915 unsigned long damage = file->added + file->deleted;
1916 if (file->is_binary)
1917 /*
1918 * binary files counts bytes, not lines. Must find some
1919 * way to normalize binary bytes vs. textual lines.
1920 * The following heuristic assumes that there are 64
1921 * bytes per "line".
1922 * This is stupid and ugly, but very cheap...
1923 */
1924 damage = (damage + 63) / 64;
1925 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1926 dir.files[dir.nr].name = file->name;
1927 dir.files[dir.nr].changed = damage;
1928 changed += damage;
1929 dir.nr++;
1930 }
1931
1932 /* This can happen even with many files, if everything was renames */
1933 if (!changed)
1934 return;
1935
1936 /* Show all directories with more than x% of the changes */
1937 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1938 gather_dirstat(options, &dir, changed, "", 0);
1939 }
1940
1941 static void free_diffstat_info(struct diffstat_t *diffstat)
1942 {
1943 int i;
1944 for (i = 0; i < diffstat->nr; i++) {
1945 struct diffstat_file *f = diffstat->files[i];
1946 if (f->name != f->print_name)
1947 free(f->print_name);
1948 free(f->name);
1949 free(f->from_name);
1950 free(f);
1951 }
1952 free(diffstat->files);
1953 }
1954
1955 struct checkdiff_t {
1956 const char *filename;
1957 int lineno;
1958 int conflict_marker_size;
1959 struct diff_options *o;
1960 unsigned ws_rule;
1961 unsigned status;
1962 };
1963
1964 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1965 {
1966 char firstchar;
1967 int cnt;
1968
1969 if (len < marker_size + 1)
1970 return 0;
1971 firstchar = line[0];
1972 switch (firstchar) {
1973 case '=': case '>': case '<': case '|':
1974 break;
1975 default:
1976 return 0;
1977 }
1978 for (cnt = 1; cnt < marker_size; cnt++)
1979 if (line[cnt] != firstchar)
1980 return 0;
1981 /* line[1] thru line[marker_size-1] are same as firstchar */
1982 if (len < marker_size + 1 || !isspace(line[marker_size]))
1983 return 0;
1984 return 1;
1985 }
1986
1987 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1988 {
1989 struct checkdiff_t *data = priv;
1990 int marker_size = data->conflict_marker_size;
1991 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
1992 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
1993 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
1994 char *err;
1995 char *line_prefix = "";
1996 struct strbuf *msgbuf;
1997
1998 assert(data->o);
1999 if (data->o->output_prefix) {
2000 msgbuf = data->o->output_prefix(data->o,
2001 data->o->output_prefix_data);
2002 line_prefix = msgbuf->buf;
2003 }
2004
2005 if (line[0] == '+') {
2006 unsigned bad;
2007 data->lineno++;
2008 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2009 data->status |= 1;
2010 fprintf(data->o->file,
2011 "%s%s:%d: leftover conflict marker\n",
2012 line_prefix, data->filename, data->lineno);
2013 }
2014 bad = ws_check(line + 1, len - 1, data->ws_rule);
2015 if (!bad)
2016 return;
2017 data->status |= bad;
2018 err = whitespace_error_string(bad);
2019 fprintf(data->o->file, "%s%s:%d: %s.\n",
2020 line_prefix, data->filename, data->lineno, err);
2021 free(err);
2022 emit_line(data->o, set, reset, line, 1);
2023 ws_check_emit(line + 1, len - 1, data->ws_rule,
2024 data->o->file, set, reset, ws);
2025 } else if (line[0] == ' ') {
2026 data->lineno++;
2027 } else if (line[0] == '@') {
2028 char *plus = strchr(line, '+');
2029 if (plus)
2030 data->lineno = strtol(plus, NULL, 10) - 1;
2031 else
2032 die("invalid diff");
2033 }
2034 }
2035
2036 static unsigned char *deflate_it(char *data,
2037 unsigned long size,
2038 unsigned long *result_size)
2039 {
2040 int bound;
2041 unsigned char *deflated;
2042 git_zstream stream;
2043
2044 memset(&stream, 0, sizeof(stream));
2045 git_deflate_init(&stream, zlib_compression_level);
2046 bound = git_deflate_bound(&stream, size);
2047 deflated = xmalloc(bound);
2048 stream.next_out = deflated;
2049 stream.avail_out = bound;
2050
2051 stream.next_in = (unsigned char *)data;
2052 stream.avail_in = size;
2053 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2054 ; /* nothing */
2055 git_deflate_end(&stream);
2056 *result_size = stream.total_out;
2057 return deflated;
2058 }
2059
2060 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2061 {
2062 void *cp;
2063 void *delta;
2064 void *deflated;
2065 void *data;
2066 unsigned long orig_size;
2067 unsigned long delta_size;
2068 unsigned long deflate_size;
2069 unsigned long data_size;
2070
2071 /* We could do deflated delta, or we could do just deflated two,
2072 * whichever is smaller.
2073 */
2074 delta = NULL;
2075 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2076 if (one->size && two->size) {
2077 delta = diff_delta(one->ptr, one->size,
2078 two->ptr, two->size,
2079 &delta_size, deflate_size);
2080 if (delta) {
2081 void *to_free = delta;
2082 orig_size = delta_size;
2083 delta = deflate_it(delta, delta_size, &delta_size);
2084 free(to_free);
2085 }
2086 }
2087
2088 if (delta && delta_size < deflate_size) {
2089 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2090 free(deflated);
2091 data = delta;
2092 data_size = delta_size;
2093 }
2094 else {
2095 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2096 free(delta);
2097 data = deflated;
2098 data_size = deflate_size;
2099 }
2100
2101 /* emit data encoded in base85 */
2102 cp = data;
2103 while (data_size) {
2104 int bytes = (52 < data_size) ? 52 : data_size;
2105 char line[70];
2106 data_size -= bytes;
2107 if (bytes <= 26)
2108 line[0] = bytes + 'A' - 1;
2109 else
2110 line[0] = bytes - 26 + 'a' - 1;
2111 encode_85(line + 1, cp, bytes);
2112 cp = (char *) cp + bytes;
2113 fprintf(file, "%s", prefix);
2114 fputs(line, file);
2115 fputc('\n', file);
2116 }
2117 fprintf(file, "%s\n", prefix);
2118 free(data);
2119 }
2120
2121 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2122 {
2123 fprintf(file, "%sGIT binary patch\n", prefix);
2124 emit_binary_diff_body(file, one, two, prefix);
2125 emit_binary_diff_body(file, two, one, prefix);
2126 }
2127
2128 int diff_filespec_is_binary(struct diff_filespec *one)
2129 {
2130 if (one->is_binary == -1) {
2131 diff_filespec_load_driver(one);
2132 if (one->driver->binary != -1)
2133 one->is_binary = one->driver->binary;
2134 else {
2135 if (!one->data && DIFF_FILE_VALID(one))
2136 diff_populate_filespec(one, 0);
2137 if (one->data)
2138 one->is_binary = buffer_is_binary(one->data,
2139 one->size);
2140 if (one->is_binary == -1)
2141 one->is_binary = 0;
2142 }
2143 }
2144 return one->is_binary;
2145 }
2146
2147 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2148 {
2149 diff_filespec_load_driver(one);
2150 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2151 }
2152
2153 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2154 {
2155 if (!options->a_prefix)
2156 options->a_prefix = a;
2157 if (!options->b_prefix)
2158 options->b_prefix = b;
2159 }
2160
2161 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2162 {
2163 if (!DIFF_FILE_VALID(one))
2164 return NULL;
2165
2166 diff_filespec_load_driver(one);
2167 return userdiff_get_textconv(one->driver);
2168 }
2169
2170 static void builtin_diff(const char *name_a,
2171 const char *name_b,
2172 struct diff_filespec *one,
2173 struct diff_filespec *two,
2174 const char *xfrm_msg,
2175 int must_show_header,
2176 struct diff_options *o,
2177 int complete_rewrite)
2178 {
2179 mmfile_t mf1, mf2;
2180 const char *lbl[2];
2181 char *a_one, *b_two;
2182 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2183 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2184 const char *a_prefix, *b_prefix;
2185 struct userdiff_driver *textconv_one = NULL;
2186 struct userdiff_driver *textconv_two = NULL;
2187 struct strbuf header = STRBUF_INIT;
2188 struct strbuf *msgbuf;
2189 char *line_prefix = "";
2190
2191 if (o->output_prefix) {
2192 msgbuf = o->output_prefix(o, o->output_prefix_data);
2193 line_prefix = msgbuf->buf;
2194 }
2195
2196 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2197 (!one->mode || S_ISGITLINK(one->mode)) &&
2198 (!two->mode || S_ISGITLINK(two->mode))) {
2199 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2200 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2201 show_submodule_summary(o->file, one ? one->path : two->path,
2202 one->sha1, two->sha1, two->dirty_submodule,
2203 del, add, reset);
2204 return;
2205 }
2206
2207 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2208 textconv_one = get_textconv(one);
2209 textconv_two = get_textconv(two);
2210 }
2211
2212 diff_set_mnemonic_prefix(o, "a/", "b/");
2213 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2214 a_prefix = o->b_prefix;
2215 b_prefix = o->a_prefix;
2216 } else {
2217 a_prefix = o->a_prefix;
2218 b_prefix = o->b_prefix;
2219 }
2220
2221 /* Never use a non-valid filename anywhere if at all possible */
2222 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2223 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2224
2225 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2226 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2227 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2228 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2229 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2230 if (lbl[0][0] == '/') {
2231 /* /dev/null */
2232 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2233 if (xfrm_msg)
2234 strbuf_addstr(&header, xfrm_msg);
2235 must_show_header = 1;
2236 }
2237 else if (lbl[1][0] == '/') {
2238 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2239 if (xfrm_msg)
2240 strbuf_addstr(&header, xfrm_msg);
2241 must_show_header = 1;
2242 }
2243 else {
2244 if (one->mode != two->mode) {
2245 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2246 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2247 must_show_header = 1;
2248 }
2249 if (xfrm_msg)
2250 strbuf_addstr(&header, xfrm_msg);
2251
2252 /*
2253 * we do not run diff between different kind
2254 * of objects.
2255 */
2256 if ((one->mode ^ two->mode) & S_IFMT)
2257 goto free_ab_and_return;
2258 if (complete_rewrite &&
2259 (textconv_one || !diff_filespec_is_binary(one)) &&
2260 (textconv_two || !diff_filespec_is_binary(two))) {
2261 fprintf(o->file, "%s", header.buf);
2262 strbuf_reset(&header);
2263 emit_rewrite_diff(name_a, name_b, one, two,
2264 textconv_one, textconv_two, o);
2265 o->found_changes = 1;
2266 goto free_ab_and_return;
2267 }
2268 }
2269
2270 if (o->irreversible_delete && lbl[1][0] == '/') {
2271 fprintf(o->file, "%s", header.buf);
2272 strbuf_reset(&header);
2273 goto free_ab_and_return;
2274 } else if (!DIFF_OPT_TST(o, TEXT) &&
2275 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2276 (!textconv_two && diff_filespec_is_binary(two)) )) {
2277 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2278 die("unable to read files to diff");
2279 /* Quite common confusing case */
2280 if (mf1.size == mf2.size &&
2281 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2282 if (must_show_header)
2283 fprintf(o->file, "%s", header.buf);
2284 goto free_ab_and_return;
2285 }
2286 fprintf(o->file, "%s", header.buf);
2287 strbuf_reset(&header);
2288 if (DIFF_OPT_TST(o, BINARY))
2289 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2290 else
2291 fprintf(o->file, "%sBinary files %s and %s differ\n",
2292 line_prefix, lbl[0], lbl[1]);
2293 o->found_changes = 1;
2294 } else {
2295 /* Crazy xdl interfaces.. */
2296 const char *diffopts = getenv("GIT_DIFF_OPTS");
2297 xpparam_t xpp;
2298 xdemitconf_t xecfg;
2299 struct emit_callback ecbdata;
2300 const struct userdiff_funcname *pe;
2301
2302 if (must_show_header) {
2303 fprintf(o->file, "%s", header.buf);
2304 strbuf_reset(&header);
2305 }
2306
2307 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2308 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2309
2310 pe = diff_funcname_pattern(one);
2311 if (!pe)
2312 pe = diff_funcname_pattern(two);
2313
2314 memset(&xpp, 0, sizeof(xpp));
2315 memset(&xecfg, 0, sizeof(xecfg));
2316 memset(&ecbdata, 0, sizeof(ecbdata));
2317 ecbdata.label_path = lbl;
2318 ecbdata.color_diff = want_color(o->use_color);
2319 ecbdata.found_changesp = &o->found_changes;
2320 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2321 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2322 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2323 ecbdata.opt = o;
2324 ecbdata.header = header.len ? &header : NULL;
2325 xpp.flags = o->xdl_opts;
2326 xecfg.ctxlen = o->context;
2327 xecfg.interhunkctxlen = o->interhunkcontext;
2328 xecfg.flags = XDL_EMIT_FUNCNAMES;
2329 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2330 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2331 if (pe)
2332 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2333 if (!diffopts)
2334 ;
2335 else if (!prefixcmp(diffopts, "--unified="))
2336 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2337 else if (!prefixcmp(diffopts, "-u"))
2338 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2339 if (o->word_diff)
2340 init_diff_words_data(&ecbdata, o, one, two);
2341 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2342 &xpp, &xecfg);
2343 if (o->word_diff)
2344 free_diff_words_data(&ecbdata);
2345 if (textconv_one)
2346 free(mf1.ptr);
2347 if (textconv_two)
2348 free(mf2.ptr);
2349 xdiff_clear_find_func(&xecfg);
2350 }
2351
2352 free_ab_and_return:
2353 strbuf_release(&header);
2354 diff_free_filespec_data(one);
2355 diff_free_filespec_data(two);
2356 free(a_one);
2357 free(b_two);
2358 return;
2359 }
2360
2361 static void builtin_diffstat(const char *name_a, const char *name_b,
2362 struct diff_filespec *one,
2363 struct diff_filespec *two,
2364 struct diffstat_t *diffstat,
2365 struct diff_options *o,
2366 int complete_rewrite)
2367 {
2368 mmfile_t mf1, mf2;
2369 struct diffstat_file *data;
2370
2371 data = diffstat_add(diffstat, name_a, name_b);
2372
2373 if (!one || !two) {
2374 data->is_unmerged = 1;
2375 return;
2376 }
2377
2378 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2379 data->is_binary = 1;
2380 data->added = diff_filespec_size(two);
2381 data->deleted = diff_filespec_size(one);
2382 }
2383
2384 else if (complete_rewrite) {
2385 diff_populate_filespec(one, 0);
2386 diff_populate_filespec(two, 0);
2387 data->deleted = count_lines(one->data, one->size);
2388 data->added = count_lines(two->data, two->size);
2389 }
2390
2391 else {
2392 /* Crazy xdl interfaces.. */
2393 xpparam_t xpp;
2394 xdemitconf_t xecfg;
2395
2396 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2397 die("unable to read files to diff");
2398
2399 memset(&xpp, 0, sizeof(xpp));
2400 memset(&xecfg, 0, sizeof(xecfg));
2401 xpp.flags = o->xdl_opts;
2402 xecfg.ctxlen = o->context;
2403 xecfg.interhunkctxlen = o->interhunkcontext;
2404 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2405 &xpp, &xecfg);
2406 }
2407
2408 diff_free_filespec_data(one);
2409 diff_free_filespec_data(two);
2410 }
2411
2412 static void builtin_checkdiff(const char *name_a, const char *name_b,
2413 const char *attr_path,
2414 struct diff_filespec *one,
2415 struct diff_filespec *two,
2416 struct diff_options *o)
2417 {
2418 mmfile_t mf1, mf2;
2419 struct checkdiff_t data;
2420
2421 if (!two)
2422 return;
2423
2424 memset(&data, 0, sizeof(data));
2425 data.filename = name_b ? name_b : name_a;
2426 data.lineno = 0;
2427 data.o = o;
2428 data.ws_rule = whitespace_rule(attr_path);
2429 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2430
2431 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2432 die("unable to read files to diff");
2433
2434 /*
2435 * All the other codepaths check both sides, but not checking
2436 * the "old" side here is deliberate. We are checking the newly
2437 * introduced changes, and as long as the "new" side is text, we
2438 * can and should check what it introduces.
2439 */
2440 if (diff_filespec_is_binary(two))
2441 goto free_and_return;
2442 else {
2443 /* Crazy xdl interfaces.. */
2444 xpparam_t xpp;
2445 xdemitconf_t xecfg;
2446
2447 memset(&xpp, 0, sizeof(xpp));
2448 memset(&xecfg, 0, sizeof(xecfg));
2449 xecfg.ctxlen = 1; /* at least one context line */
2450 xpp.flags = 0;
2451 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2452 &xpp, &xecfg);
2453
2454 if (data.ws_rule & WS_BLANK_AT_EOF) {
2455 struct emit_callback ecbdata;
2456 int blank_at_eof;
2457
2458 ecbdata.ws_rule = data.ws_rule;
2459 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2460 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2461
2462 if (blank_at_eof) {
2463 static char *err;
2464 if (!err)
2465 err = whitespace_error_string(WS_BLANK_AT_EOF);
2466 fprintf(o->file, "%s:%d: %s.\n",
2467 data.filename, blank_at_eof, err);
2468 data.status = 1; /* report errors */
2469 }
2470 }
2471 }
2472 free_and_return:
2473 diff_free_filespec_data(one);
2474 diff_free_filespec_data(two);
2475 if (data.status)
2476 DIFF_OPT_SET(o, CHECK_FAILED);
2477 }
2478
2479 struct diff_filespec *alloc_filespec(const char *path)
2480 {
2481 int namelen = strlen(path);
2482 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2483
2484 memset(spec, 0, sizeof(*spec));
2485 spec->path = (char *)(spec + 1);
2486 memcpy(spec->path, path, namelen+1);
2487 spec->count = 1;
2488 spec->is_binary = -1;
2489 return spec;
2490 }
2491
2492 void free_filespec(struct diff_filespec *spec)
2493 {
2494 if (!--spec->count) {
2495 diff_free_filespec_data(spec);
2496 free(spec);
2497 }
2498 }
2499
2500 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2501 unsigned short mode)
2502 {
2503 if (mode) {
2504 spec->mode = canon_mode(mode);
2505 hashcpy(spec->sha1, sha1);
2506 spec->sha1_valid = !is_null_sha1(sha1);
2507 }
2508 }
2509
2510 /*
2511 * Given a name and sha1 pair, if the index tells us the file in
2512 * the work tree has that object contents, return true, so that
2513 * prepare_temp_file() does not have to inflate and extract.
2514 */
2515 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2516 {
2517 struct cache_entry *ce;
2518 struct stat st;
2519 int pos, len;
2520
2521 /*
2522 * We do not read the cache ourselves here, because the
2523 * benchmark with my previous version that always reads cache
2524 * shows that it makes things worse for diff-tree comparing
2525 * two linux-2.6 kernel trees in an already checked out work
2526 * tree. This is because most diff-tree comparisons deal with
2527 * only a small number of files, while reading the cache is
2528 * expensive for a large project, and its cost outweighs the
2529 * savings we get by not inflating the object to a temporary
2530 * file. Practically, this code only helps when we are used
2531 * by diff-cache --cached, which does read the cache before
2532 * calling us.
2533 */
2534 if (!active_cache)
2535 return 0;
2536
2537 /* We want to avoid the working directory if our caller
2538 * doesn't need the data in a normal file, this system
2539 * is rather slow with its stat/open/mmap/close syscalls,
2540 * and the object is contained in a pack file. The pack
2541 * is probably already open and will be faster to obtain
2542 * the data through than the working directory. Loose
2543 * objects however would tend to be slower as they need
2544 * to be individually opened and inflated.
2545 */
2546 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2547 return 0;
2548
2549 len = strlen(name);
2550 pos = cache_name_pos(name, len);
2551 if (pos < 0)
2552 return 0;
2553 ce = active_cache[pos];
2554
2555 /*
2556 * This is not the sha1 we are looking for, or
2557 * unreusable because it is not a regular file.
2558 */
2559 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2560 return 0;
2561
2562 /*
2563 * If ce is marked as "assume unchanged", there is no
2564 * guarantee that work tree matches what we are looking for.
2565 */
2566 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2567 return 0;
2568
2569 /*
2570 * If ce matches the file in the work tree, we can reuse it.
2571 */
2572 if (ce_uptodate(ce) ||
2573 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2574 return 1;
2575
2576 return 0;
2577 }
2578
2579 static int populate_from_stdin(struct diff_filespec *s)
2580 {
2581 struct strbuf buf = STRBUF_INIT;
2582 size_t size = 0;
2583
2584 if (strbuf_read(&buf, 0, 0) < 0)
2585 return error("error while reading from stdin %s",
2586 strerror(errno));
2587
2588 s->should_munmap = 0;
2589 s->data = strbuf_detach(&buf, &size);
2590 s->size = size;
2591 s->should_free = 1;
2592 return 0;
2593 }
2594
2595 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2596 {
2597 int len;
2598 char *data = xmalloc(100), *dirty = "";
2599
2600 /* Are we looking at the work tree? */
2601 if (s->dirty_submodule)
2602 dirty = "-dirty";
2603
2604 len = snprintf(data, 100,
2605 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2606 s->data = data;
2607 s->size = len;
2608 s->should_free = 1;
2609 if (size_only) {
2610 s->data = NULL;
2611 free(data);
2612 }
2613 return 0;
2614 }
2615
2616 /*
2617 * While doing rename detection and pickaxe operation, we may need to
2618 * grab the data for the blob (or file) for our own in-core comparison.
2619 * diff_filespec has data and size fields for this purpose.
2620 */
2621 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2622 {
2623 int err = 0;
2624 if (!DIFF_FILE_VALID(s))
2625 die("internal error: asking to populate invalid file.");
2626 if (S_ISDIR(s->mode))
2627 return -1;
2628
2629 if (s->data)
2630 return 0;
2631
2632 if (size_only && 0 < s->size)
2633 return 0;
2634
2635 if (S_ISGITLINK(s->mode))
2636 return diff_populate_gitlink(s, size_only);
2637
2638 if (!s->sha1_valid ||
2639 reuse_worktree_file(s->path, s->sha1, 0)) {
2640 struct strbuf buf = STRBUF_INIT;
2641 struct stat st;
2642 int fd;
2643
2644 if (!strcmp(s->path, "-"))
2645 return populate_from_stdin(s);
2646
2647 if (lstat(s->path, &st) < 0) {
2648 if (errno == ENOENT) {
2649 err_empty:
2650 err = -1;
2651 empty:
2652 s->data = (char *)"";
2653 s->size = 0;
2654 return err;
2655 }
2656 }
2657 s->size = xsize_t(st.st_size);
2658 if (!s->size)
2659 goto empty;
2660 if (S_ISLNK(st.st_mode)) {
2661 struct strbuf sb = STRBUF_INIT;
2662
2663 if (strbuf_readlink(&sb, s->path, s->size))
2664 goto err_empty;
2665 s->size = sb.len;
2666 s->data = strbuf_detach(&sb, NULL);
2667 s->should_free = 1;
2668 return 0;
2669 }
2670 if (size_only)
2671 return 0;
2672 fd = open(s->path, O_RDONLY);
2673 if (fd < 0)
2674 goto err_empty;
2675 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2676 close(fd);
2677 s->should_munmap = 1;
2678
2679 /*
2680 * Convert from working tree format to canonical git format
2681 */
2682 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2683 size_t size = 0;
2684 munmap(s->data, s->size);
2685 s->should_munmap = 0;
2686 s->data = strbuf_detach(&buf, &size);
2687 s->size = size;
2688 s->should_free = 1;
2689 }
2690 }
2691 else {
2692 enum object_type type;
2693 if (size_only) {
2694 type = sha1_object_info(s->sha1, &s->size);
2695 if (type < 0)
2696 die("unable to read %s", sha1_to_hex(s->sha1));
2697 } else {
2698 s->data = read_sha1_file(s->sha1, &type, &s->size);
2699 if (!s->data)
2700 die("unable to read %s", sha1_to_hex(s->sha1));
2701 s->should_free = 1;
2702 }
2703 }
2704 return 0;
2705 }
2706
2707 void diff_free_filespec_blob(struct diff_filespec *s)
2708 {
2709 if (s->should_free)
2710 free(s->data);
2711 else if (s->should_munmap)
2712 munmap(s->data, s->size);
2713
2714 if (s->should_free || s->should_munmap) {
2715 s->should_free = s->should_munmap = 0;
2716 s->data = NULL;
2717 }
2718 }
2719
2720 void diff_free_filespec_data(struct diff_filespec *s)
2721 {
2722 diff_free_filespec_blob(s);
2723 free(s->cnt_data);
2724 s->cnt_data = NULL;
2725 }
2726
2727 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2728 void *blob,
2729 unsigned long size,
2730 const unsigned char *sha1,
2731 int mode)
2732 {
2733 int fd;
2734 struct strbuf buf = STRBUF_INIT;
2735 struct strbuf template = STRBUF_INIT;
2736 char *path_dup = xstrdup(path);
2737 const char *base = basename(path_dup);
2738
2739 /* Generate "XXXXXX_basename.ext" */
2740 strbuf_addstr(&template, "XXXXXX_");
2741 strbuf_addstr(&template, base);
2742
2743 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2744 strlen(base) + 1);
2745 if (fd < 0)
2746 die_errno("unable to create temp-file");
2747 if (convert_to_working_tree(path,
2748 (const char *)blob, (size_t)size, &buf)) {
2749 blob = buf.buf;
2750 size = buf.len;
2751 }
2752 if (write_in_full(fd, blob, size) != size)
2753 die_errno("unable to write temp-file");
2754 close(fd);
2755 temp->name = temp->tmp_path;
2756 strcpy(temp->hex, sha1_to_hex(sha1));
2757 temp->hex[40] = 0;
2758 sprintf(temp->mode, "%06o", mode);
2759 strbuf_release(&buf);
2760 strbuf_release(&template);
2761 free(path_dup);
2762 }
2763
2764 static struct diff_tempfile *prepare_temp_file(const char *name,
2765 struct diff_filespec *one)
2766 {
2767 struct diff_tempfile *temp = claim_diff_tempfile();
2768
2769 if (!DIFF_FILE_VALID(one)) {
2770 not_a_valid_file:
2771 /* A '-' entry produces this for file-2, and
2772 * a '+' entry produces this for file-1.
2773 */
2774 temp->name = "/dev/null";
2775 strcpy(temp->hex, ".");
2776 strcpy(temp->mode, ".");
2777 return temp;
2778 }
2779
2780 if (!remove_tempfile_installed) {
2781 atexit(remove_tempfile);
2782 sigchain_push_common(remove_tempfile_on_signal);
2783 remove_tempfile_installed = 1;
2784 }
2785
2786 if (!one->sha1_valid ||
2787 reuse_worktree_file(name, one->sha1, 1)) {
2788 struct stat st;
2789 if (lstat(name, &st) < 0) {
2790 if (errno == ENOENT)
2791 goto not_a_valid_file;
2792 die_errno("stat(%s)", name);
2793 }
2794 if (S_ISLNK(st.st_mode)) {
2795 struct strbuf sb = STRBUF_INIT;
2796 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2797 die_errno("readlink(%s)", name);
2798 prep_temp_blob(name, temp, sb.buf, sb.len,
2799 (one->sha1_valid ?
2800 one->sha1 : null_sha1),
2801 (one->sha1_valid ?
2802 one->mode : S_IFLNK));
2803 strbuf_release(&sb);
2804 }
2805 else {
2806 /* we can borrow from the file in the work tree */
2807 temp->name = name;
2808 if (!one->sha1_valid)
2809 strcpy(temp->hex, sha1_to_hex(null_sha1));
2810 else
2811 strcpy(temp->hex, sha1_to_hex(one->sha1));
2812 /* Even though we may sometimes borrow the
2813 * contents from the work tree, we always want
2814 * one->mode. mode is trustworthy even when
2815 * !(one->sha1_valid), as long as
2816 * DIFF_FILE_VALID(one).
2817 */
2818 sprintf(temp->mode, "%06o", one->mode);
2819 }
2820 return temp;
2821 }
2822 else {
2823 if (diff_populate_filespec(one, 0))
2824 die("cannot read data blob for %s", one->path);
2825 prep_temp_blob(name, temp, one->data, one->size,
2826 one->sha1, one->mode);
2827 }
2828 return temp;
2829 }
2830
2831 /* An external diff command takes:
2832 *
2833 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2834 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2835 *
2836 */
2837 static void run_external_diff(const char *pgm,
2838 const char *name,
2839 const char *other,
2840 struct diff_filespec *one,
2841 struct diff_filespec *two,
2842 const char *xfrm_msg,
2843 int complete_rewrite)
2844 {
2845 const char *spawn_arg[10];
2846 int retval;
2847 const char **arg = &spawn_arg[0];
2848
2849 if (one && two) {
2850 struct diff_tempfile *temp_one, *temp_two;
2851 const char *othername = (other ? other : name);
2852 temp_one = prepare_temp_file(name, one);
2853 temp_two = prepare_temp_file(othername, two);
2854 *arg++ = pgm;
2855 *arg++ = name;
2856 *arg++ = temp_one->name;
2857 *arg++ = temp_one->hex;
2858 *arg++ = temp_one->mode;
2859 *arg++ = temp_two->name;
2860 *arg++ = temp_two->hex;
2861 *arg++ = temp_two->mode;
2862 if (other) {
2863 *arg++ = other;
2864 *arg++ = xfrm_msg;
2865 }
2866 } else {
2867 *arg++ = pgm;
2868 *arg++ = name;
2869 }
2870 *arg = NULL;
2871 fflush(NULL);
2872 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2873 remove_tempfile();
2874 if (retval) {
2875 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2876 exit(1);
2877 }
2878 }
2879
2880 static int similarity_index(struct diff_filepair *p)
2881 {
2882 return p->score * 100 / MAX_SCORE;
2883 }
2884
2885 static void fill_metainfo(struct strbuf *msg,
2886 const char *name,
2887 const char *other,
2888 struct diff_filespec *one,
2889 struct diff_filespec *two,
2890 struct diff_options *o,
2891 struct diff_filepair *p,
2892 int *must_show_header,
2893 int use_color)
2894 {
2895 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2896 const char *reset = diff_get_color(use_color, DIFF_RESET);
2897 struct strbuf *msgbuf;
2898 char *line_prefix = "";
2899
2900 *must_show_header = 1;
2901 if (o->output_prefix) {
2902 msgbuf = o->output_prefix(o, o->output_prefix_data);
2903 line_prefix = msgbuf->buf;
2904 }
2905 strbuf_init(msg, PATH_MAX * 2 + 300);
2906 switch (p->status) {
2907 case DIFF_STATUS_COPIED:
2908 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2909 line_prefix, set, similarity_index(p));
2910 strbuf_addf(msg, "%s\n%s%scopy from ",
2911 reset, line_prefix, set);
2912 quote_c_style(name, msg, NULL, 0);
2913 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2914 quote_c_style(other, msg, NULL, 0);
2915 strbuf_addf(msg, "%s\n", reset);
2916 break;
2917 case DIFF_STATUS_RENAMED:
2918 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2919 line_prefix, set, similarity_index(p));
2920 strbuf_addf(msg, "%s\n%s%srename from ",
2921 reset, line_prefix, set);
2922 quote_c_style(name, msg, NULL, 0);
2923 strbuf_addf(msg, "%s\n%s%srename to ",
2924 reset, line_prefix, set);
2925 quote_c_style(other, msg, NULL, 0);
2926 strbuf_addf(msg, "%s\n", reset);
2927 break;
2928 case DIFF_STATUS_MODIFIED:
2929 if (p->score) {
2930 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2931 line_prefix,
2932 set, similarity_index(p), reset);
2933 break;
2934 }
2935 /* fallthru */
2936 default:
2937 *must_show_header = 0;
2938 }
2939 if (one && two && hashcmp(one->sha1, two->sha1)) {
2940 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2941
2942 if (DIFF_OPT_TST(o, BINARY)) {
2943 mmfile_t mf;
2944 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2945 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2946 abbrev = 40;
2947 }
2948 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2949 find_unique_abbrev(one->sha1, abbrev));
2950 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2951 if (one->mode == two->mode)
2952 strbuf_addf(msg, " %06o", one->mode);
2953 strbuf_addf(msg, "%s\n", reset);
2954 }
2955 }
2956
2957 static void run_diff_cmd(const char *pgm,
2958 const char *name,
2959 const char *other,
2960 const char *attr_path,
2961 struct diff_filespec *one,
2962 struct diff_filespec *two,
2963 struct strbuf *msg,
2964 struct diff_options *o,
2965 struct diff_filepair *p)
2966 {
2967 const char *xfrm_msg = NULL;
2968 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2969 int must_show_header = 0;
2970
2971 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2972 pgm = NULL;
2973 else {
2974 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2975 if (drv && drv->external)
2976 pgm = drv->external;
2977 }
2978
2979 if (msg) {
2980 /*
2981 * don't use colors when the header is intended for an
2982 * external diff driver
2983 */
2984 fill_metainfo(msg, name, other, one, two, o, p,
2985 &must_show_header,
2986 want_color(o->use_color) && !pgm);
2987 xfrm_msg = msg->len ? msg->buf : NULL;
2988 }
2989
2990 if (pgm) {
2991 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2992 complete_rewrite);
2993 return;
2994 }
2995 if (one && two)
2996 builtin_diff(name, other ? other : name,
2997 one, two, xfrm_msg, must_show_header,
2998 o, complete_rewrite);
2999 else
3000 fprintf(o->file, "* Unmerged path %s\n", name);
3001 }
3002
3003 static void diff_fill_sha1_info(struct diff_filespec *one)
3004 {
3005 if (DIFF_FILE_VALID(one)) {
3006 if (!one->sha1_valid) {
3007 struct stat st;
3008 if (!strcmp(one->path, "-")) {
3009 hashcpy(one->sha1, null_sha1);
3010 return;
3011 }
3012 if (lstat(one->path, &st) < 0)
3013 die_errno("stat '%s'", one->path);
3014 if (index_path(one->sha1, one->path, &st, 0))
3015 die("cannot hash %s", one->path);
3016 }
3017 }
3018 else
3019 hashclr(one->sha1);
3020 }
3021
3022 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3023 {
3024 /* Strip the prefix but do not molest /dev/null and absolute paths */
3025 if (*namep && **namep != '/') {
3026 *namep += prefix_length;
3027 if (**namep == '/')
3028 ++*namep;
3029 }
3030 if (*otherp && **otherp != '/') {
3031 *otherp += prefix_length;
3032 if (**otherp == '/')
3033 ++*otherp;
3034 }
3035 }
3036
3037 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3038 {
3039 const char *pgm = external_diff();
3040 struct strbuf msg;
3041 struct diff_filespec *one = p->one;
3042 struct diff_filespec *two = p->two;
3043 const char *name;
3044 const char *other;
3045 const char *attr_path;
3046
3047 name = p->one->path;
3048 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3049 attr_path = name;
3050 if (o->prefix_length)
3051 strip_prefix(o->prefix_length, &name, &other);
3052
3053 if (DIFF_PAIR_UNMERGED(p)) {
3054 run_diff_cmd(pgm, name, NULL, attr_path,
3055 NULL, NULL, NULL, o, p);
3056 return;
3057 }
3058
3059 diff_fill_sha1_info(one);
3060 diff_fill_sha1_info(two);
3061
3062 if (!pgm &&
3063 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3064 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3065 /*
3066 * a filepair that changes between file and symlink
3067 * needs to be split into deletion and creation.
3068 */
3069 struct diff_filespec *null = alloc_filespec(two->path);
3070 run_diff_cmd(NULL, name, other, attr_path,
3071 one, null, &msg, o, p);
3072 free(null);
3073 strbuf_release(&msg);
3074
3075 null = alloc_filespec(one->path);
3076 run_diff_cmd(NULL, name, other, attr_path,
3077 null, two, &msg, o, p);
3078 free(null);
3079 }
3080 else
3081 run_diff_cmd(pgm, name, other, attr_path,
3082 one, two, &msg, o, p);
3083
3084 strbuf_release(&msg);
3085 }
3086
3087 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3088 struct diffstat_t *diffstat)
3089 {
3090 const char *name;
3091 const char *other;
3092 int complete_rewrite = 0;
3093
3094 if (DIFF_PAIR_UNMERGED(p)) {
3095 /* unmerged */
3096 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
3097 return;
3098 }
3099
3100 name = p->one->path;
3101 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3102
3103 if (o->prefix_length)
3104 strip_prefix(o->prefix_length, &name, &other);
3105
3106 diff_fill_sha1_info(p->one);
3107 diff_fill_sha1_info(p->two);
3108
3109 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3110 complete_rewrite = 1;
3111 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
3112 }
3113
3114 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3115 {
3116 const char *name;
3117 const char *other;
3118 const char *attr_path;
3119
3120 if (DIFF_PAIR_UNMERGED(p)) {
3121 /* unmerged */
3122 return;
3123 }
3124
3125 name = p->one->path;
3126 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3127 attr_path = other ? other : name;
3128
3129 if (o->prefix_length)
3130 strip_prefix(o->prefix_length, &name, &other);
3131
3132 diff_fill_sha1_info(p->one);
3133 diff_fill_sha1_info(p->two);
3134
3135 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3136 }
3137
3138 void diff_setup(struct diff_options *options)
3139 {
3140 memcpy(options, &default_diff_options, sizeof(*options));
3141
3142 options->file = stdout;
3143
3144 options->line_termination = '\n';
3145 options->break_opt = -1;
3146 options->rename_limit = -1;
3147 options->dirstat_permille = diff_dirstat_permille_default;
3148 options->context = 3;
3149
3150 options->change = diff_change;
3151 options->add_remove = diff_addremove;
3152 options->use_color = diff_use_color_default;
3153 options->detect_rename = diff_detect_rename_default;
3154
3155 if (diff_no_prefix) {
3156 options->a_prefix = options->b_prefix = "";
3157 } else if (!diff_mnemonic_prefix) {
3158 options->a_prefix = "a/";
3159 options->b_prefix = "b/";
3160 }
3161 }
3162
3163 int diff_setup_done(struct diff_options *options)
3164 {
3165 int count = 0;
3166
3167 if (options->output_format & DIFF_FORMAT_NAME)
3168 count++;
3169 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3170 count++;
3171 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3172 count++;
3173 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3174 count++;
3175 if (count > 1)
3176 die("--name-only, --name-status, --check and -s are mutually exclusive");
3177
3178 /*
3179 * Most of the time we can say "there are changes"
3180 * only by checking if there are changed paths, but
3181 * --ignore-whitespace* options force us to look
3182 * inside contents.
3183 */
3184
3185 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3186 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3187 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3188 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3189 else
3190 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3191
3192 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3193 options->detect_rename = DIFF_DETECT_COPY;
3194
3195 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3196 options->prefix = NULL;
3197 if (options->prefix)
3198 options->prefix_length = strlen(options->prefix);
3199 else
3200 options->prefix_length = 0;
3201
3202 if (options->output_format & (DIFF_FORMAT_NAME |
3203 DIFF_FORMAT_NAME_STATUS |
3204 DIFF_FORMAT_CHECKDIFF |
3205 DIFF_FORMAT_NO_OUTPUT))
3206 options->output_format &= ~(DIFF_FORMAT_RAW |
3207 DIFF_FORMAT_NUMSTAT |
3208 DIFF_FORMAT_DIFFSTAT |
3209 DIFF_FORMAT_SHORTSTAT |
3210 DIFF_FORMAT_DIRSTAT |
3211 DIFF_FORMAT_SUMMARY |
3212 DIFF_FORMAT_PATCH);
3213
3214 /*
3215 * These cases always need recursive; we do not drop caller-supplied
3216 * recursive bits for other formats here.
3217 */
3218 if (options->output_format & (DIFF_FORMAT_PATCH |
3219 DIFF_FORMAT_NUMSTAT |
3220 DIFF_FORMAT_DIFFSTAT |
3221 DIFF_FORMAT_SHORTSTAT |
3222 DIFF_FORMAT_DIRSTAT |
3223 DIFF_FORMAT_SUMMARY |
3224 DIFF_FORMAT_CHECKDIFF))
3225 DIFF_OPT_SET(options, RECURSIVE);
3226 /*
3227 * Also pickaxe would not work very well if you do not say recursive
3228 */
3229 if (options->pickaxe)
3230 DIFF_OPT_SET(options, RECURSIVE);
3231 /*
3232 * When patches are generated, submodules diffed against the work tree
3233 * must be checked for dirtiness too so it can be shown in the output
3234 */
3235 if (options->output_format & DIFF_FORMAT_PATCH)
3236 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3237
3238 if (options->detect_rename && options->rename_limit < 0)
3239 options->rename_limit = diff_rename_limit_default;
3240 if (options->setup & DIFF_SETUP_USE_CACHE) {
3241 if (!active_cache)
3242 /* read-cache does not die even when it fails
3243 * so it is safe for us to do this here. Also
3244 * it does not smudge active_cache or active_nr
3245 * when it fails, so we do not have to worry about
3246 * cleaning it up ourselves either.
3247 */
3248 read_cache();
3249 }
3250 if (options->abbrev <= 0 || 40 < options->abbrev)
3251 options->abbrev = 40; /* full */
3252
3253 /*
3254 * It does not make sense to show the first hit we happened
3255 * to have found. It does not make sense not to return with
3256 * exit code in such a case either.
3257 */
3258 if (DIFF_OPT_TST(options, QUICK)) {
3259 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3260 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3261 }
3262
3263 return 0;
3264 }
3265
3266 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3267 {
3268 char c, *eq;
3269 int len;
3270
3271 if (*arg != '-')
3272 return 0;
3273 c = *++arg;
3274 if (!c)
3275 return 0;
3276 if (c == arg_short) {
3277 c = *++arg;
3278 if (!c)
3279 return 1;
3280 if (val && isdigit(c)) {
3281 char *end;
3282 int n = strtoul(arg, &end, 10);
3283 if (*end)
3284 return 0;
3285 *val = n;
3286 return 1;
3287 }
3288 return 0;
3289 }
3290 if (c != '-')
3291 return 0;
3292 arg++;
3293 eq = strchr(arg, '=');
3294 if (eq)
3295 len = eq - arg;
3296 else
3297 len = strlen(arg);
3298 if (!len || strncmp(arg, arg_long, len))
3299 return 0;
3300 if (eq) {
3301 int n;
3302 char *end;
3303 if (!isdigit(*++eq))
3304 return 0;
3305 n = strtoul(eq, &end, 10);
3306 if (*end)
3307 return 0;
3308 *val = n;
3309 }
3310 return 1;
3311 }
3312
3313 static int diff_scoreopt_parse(const char *opt);
3314
3315 static inline int short_opt(char opt, const char **argv,
3316 const char **optarg)
3317 {
3318 const char *arg = argv[0];
3319 if (arg[0] != '-' || arg[1] != opt)
3320 return 0;
3321 if (arg[2] != '\0') {
3322 *optarg = arg + 2;
3323 return 1;
3324 }
3325 if (!argv[1])
3326 die("Option '%c' requires a value", opt);
3327 *optarg = argv[1];
3328 return 2;
3329 }
3330
3331 int parse_long_opt(const char *opt, const char **argv,
3332 const char **optarg)
3333 {
3334 const char *arg = argv[0];
3335 if (arg[0] != '-' || arg[1] != '-')
3336 return 0;
3337 arg += strlen("--");
3338 if (prefixcmp(arg, opt))
3339 return 0;
3340 arg += strlen(opt);
3341 if (*arg == '=') { /* sticked form: --option=value */
3342 *optarg = arg + 1;
3343 return 1;
3344 }
3345 if (*arg != '\0')
3346 return 0;
3347 /* separate form: --option value */
3348 if (!argv[1])
3349 die("Option '--%s' requires a value", opt);
3350 *optarg = argv[1];
3351 return 2;
3352 }
3353
3354 static int stat_opt(struct diff_options *options, const char **av)
3355 {
3356 const char *arg = av[0];
3357 char *end;
3358 int width = options->stat_width;
3359 int name_width = options->stat_name_width;
3360 int graph_width = options->stat_graph_width;
3361 int count = options->stat_count;
3362 int argcount = 1;
3363
3364 arg += strlen("--stat");
3365 end = (char *)arg;
3366
3367 switch (*arg) {
3368 case '-':
3369 if (!prefixcmp(arg, "-width")) {
3370 arg += strlen("-width");
3371 if (*arg == '=')
3372 width = strtoul(arg + 1, &end, 10);
3373 else if (!*arg && !av[1])
3374 die("Option '--stat-width' requires a value");
3375 else if (!*arg) {
3376 width = strtoul(av[1], &end, 10);
3377 argcount = 2;
3378 }
3379 } else if (!prefixcmp(arg, "-name-width")) {
3380 arg += strlen("-name-width");
3381 if (*arg == '=')
3382 name_width = strtoul(arg + 1, &end, 10);
3383 else if (!*arg && !av[1])
3384 die("Option '--stat-name-width' requires a value");
3385 else if (!*arg) {
3386 name_width = strtoul(av[1], &end, 10);
3387 argcount = 2;
3388 }
3389 } else if (!prefixcmp(arg, "-graph-width")) {
3390 arg += strlen("-graph-width");
3391 if (*arg == '=')
3392 graph_width = strtoul(arg + 1, &end, 10);
3393 else if (!*arg && !av[1])
3394 die("Option '--stat-graph-width' requires a value");
3395 else if (!*arg) {
3396 graph_width = strtoul(av[1], &end, 10);
3397 argcount = 2;
3398 }
3399 } else if (!prefixcmp(arg, "-count")) {
3400 arg += strlen("-count");
3401 if (*arg == '=')
3402 count = strtoul(arg + 1, &end, 10);
3403 else if (!*arg && !av[1])
3404 die("Option '--stat-count' requires a value");
3405 else if (!*arg) {
3406 count = strtoul(av[1], &end, 10);
3407 argcount = 2;
3408 }
3409 }
3410 break;
3411 case '=':
3412 width = strtoul(arg+1, &end, 10);
3413 if (*end == ',')
3414 name_width = strtoul(end+1, &end, 10);
3415 if (*end == ',')
3416 count = strtoul(end+1, &end, 10);
3417 }
3418
3419 /* Important! This checks all the error cases! */
3420 if (*end)
3421 return 0;
3422 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3423 options->stat_name_width = name_width;
3424 options->stat_graph_width = graph_width;
3425 options->stat_width = width;
3426 options->stat_count = count;
3427 return argcount;
3428 }
3429
3430 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3431 {
3432 struct strbuf errmsg = STRBUF_INIT;
3433 if (parse_dirstat_params(options, params, &errmsg))
3434 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3435 errmsg.buf);
3436 strbuf_release(&errmsg);
3437 /*
3438 * The caller knows a dirstat-related option is given from the command
3439 * line; allow it to say "return this_function();"
3440 */
3441 options->output_format |= DIFF_FORMAT_DIRSTAT;
3442 return 1;
3443 }
3444
3445 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3446 {
3447 const char *arg = av[0];
3448 const char *optarg;
3449 int argcount;
3450
3451 /* Output format options */
3452 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3453 options->output_format |= DIFF_FORMAT_PATCH;
3454 else if (opt_arg(arg, 'U', "unified", &options->context))
3455 options->output_format |= DIFF_FORMAT_PATCH;
3456 else if (!strcmp(arg, "--raw"))
3457 options->output_format |= DIFF_FORMAT_RAW;
3458 else if (!strcmp(arg, "--patch-with-raw"))
3459 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3460 else if (!strcmp(arg, "--numstat"))
3461 options->output_format |= DIFF_FORMAT_NUMSTAT;
3462 else if (!strcmp(arg, "--shortstat"))
3463 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3464 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3465 return parse_dirstat_opt(options, "");
3466 else if (!prefixcmp(arg, "-X"))
3467 return parse_dirstat_opt(options, arg + 2);
3468 else if (!prefixcmp(arg, "--dirstat="))
3469 return parse_dirstat_opt(options, arg + 10);
3470 else if (!strcmp(arg, "--cumulative"))
3471 return parse_dirstat_opt(options, "cumulative");
3472 else if (!strcmp(arg, "--dirstat-by-file"))
3473 return parse_dirstat_opt(options, "files");
3474 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3475 parse_dirstat_opt(options, "files");
3476 return parse_dirstat_opt(options, arg + 18);
3477 }
3478 else if (!strcmp(arg, "--check"))
3479 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3480 else if (!strcmp(arg, "--summary"))
3481 options->output_format |= DIFF_FORMAT_SUMMARY;
3482 else if (!strcmp(arg, "--patch-with-stat"))
3483 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3484 else if (!strcmp(arg, "--name-only"))
3485 options->output_format |= DIFF_FORMAT_NAME;
3486 else if (!strcmp(arg, "--name-status"))
3487 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3488 else if (!strcmp(arg, "-s"))
3489 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3490 else if (!prefixcmp(arg, "--stat"))
3491 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3492 return stat_opt(options, av);
3493
3494 /* renames options */
3495 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3496 !strcmp(arg, "--break-rewrites")) {
3497 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3498 return error("invalid argument to -B: %s", arg+2);
3499 }
3500 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3501 !strcmp(arg, "--find-renames")) {
3502 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3503 return error("invalid argument to -M: %s", arg+2);
3504 options->detect_rename = DIFF_DETECT_RENAME;
3505 }
3506 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3507 options->irreversible_delete = 1;
3508 }
3509 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3510 !strcmp(arg, "--find-copies")) {
3511 if (options->detect_rename == DIFF_DETECT_COPY)
3512 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3513 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3514 return error("invalid argument to -C: %s", arg+2);
3515 options->detect_rename = DIFF_DETECT_COPY;
3516 }
3517 else if (!strcmp(arg, "--no-renames"))
3518 options->detect_rename = 0;
3519 else if (!strcmp(arg, "--relative"))
3520 DIFF_OPT_SET(options, RELATIVE_NAME);
3521 else if (!prefixcmp(arg, "--relative=")) {
3522 DIFF_OPT_SET(options, RELATIVE_NAME);
3523 options->prefix = arg + 11;
3524 }
3525
3526 /* xdiff options */
3527 else if (!strcmp(arg, "--minimal"))
3528 DIFF_XDL_SET(options, NEED_MINIMAL);
3529 else if (!strcmp(arg, "--no-minimal"))
3530 DIFF_XDL_CLR(options, NEED_MINIMAL);
3531 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3532 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3533 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3534 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3535 else if (!strcmp(arg, "--ignore-space-at-eol"))
3536 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3537 else if (!strcmp(arg, "--patience"))
3538 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3539 else if (!strcmp(arg, "--histogram"))
3540 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3541
3542 /* flags options */
3543 else if (!strcmp(arg, "--binary")) {
3544 options->output_format |= DIFF_FORMAT_PATCH;
3545 DIFF_OPT_SET(options, BINARY);
3546 }
3547 else if (!strcmp(arg, "--full-index"))
3548 DIFF_OPT_SET(options, FULL_INDEX);
3549 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3550 DIFF_OPT_SET(options, TEXT);
3551 else if (!strcmp(arg, "-R"))
3552 DIFF_OPT_SET(options, REVERSE_DIFF);
3553 else if (!strcmp(arg, "--find-copies-harder"))
3554 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3555 else if (!strcmp(arg, "--follow"))
3556 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3557 else if (!strcmp(arg, "--color"))
3558 options->use_color = 1;
3559 else if (!prefixcmp(arg, "--color=")) {
3560 int value = git_config_colorbool(NULL, arg+8);
3561 if (value < 0)
3562 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3563 options->use_color = value;
3564 }
3565 else if (!strcmp(arg, "--no-color"))
3566 options->use_color = 0;
3567 else if (!strcmp(arg, "--color-words")) {
3568 options->use_color = 1;
3569 options->word_diff = DIFF_WORDS_COLOR;
3570 }
3571 else if (!prefixcmp(arg, "--color-words=")) {
3572 options->use_color = 1;
3573 options->word_diff = DIFF_WORDS_COLOR;
3574 options->word_regex = arg + 14;
3575 }
3576 else if (!strcmp(arg, "--word-diff")) {
3577 if (options->word_diff == DIFF_WORDS_NONE)
3578 options->word_diff = DIFF_WORDS_PLAIN;
3579 }
3580 else if (!prefixcmp(arg, "--word-diff=")) {
3581 const char *type = arg + 12;
3582 if (!strcmp(type, "plain"))
3583 options->word_diff = DIFF_WORDS_PLAIN;
3584 else if (!strcmp(type, "color")) {
3585 options->use_color = 1;
3586 options->word_diff = DIFF_WORDS_COLOR;
3587 }
3588 else if (!strcmp(type, "porcelain"))
3589 options->word_diff = DIFF_WORDS_PORCELAIN;
3590 else if (!strcmp(type, "none"))
3591 options->word_diff = DIFF_WORDS_NONE;
3592 else
3593 die("bad --word-diff argument: %s", type);
3594 }
3595 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3596 if (options->word_diff == DIFF_WORDS_NONE)
3597 options->word_diff = DIFF_WORDS_PLAIN;
3598 options->word_regex = optarg;
3599 return argcount;
3600 }
3601 else if (!strcmp(arg, "--exit-code"))
3602 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3603 else if (!strcmp(arg, "--quiet"))
3604 DIFF_OPT_SET(options, QUICK);
3605 else if (!strcmp(arg, "--ext-diff"))
3606 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3607 else if (!strcmp(arg, "--no-ext-diff"))
3608 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3609 else if (!strcmp(arg, "--textconv"))
3610 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3611 else if (!strcmp(arg, "--no-textconv"))
3612 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3613 else if (!strcmp(arg, "--ignore-submodules")) {
3614 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3615 handle_ignore_submodules_arg(options, "all");
3616 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3617 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3618 handle_ignore_submodules_arg(options, arg + 20);
3619 } else if (!strcmp(arg, "--submodule"))
3620 DIFF_OPT_SET(options, SUBMODULE_LOG);
3621 else if (!prefixcmp(arg, "--submodule=")) {
3622 if (!strcmp(arg + 12, "log"))
3623 DIFF_OPT_SET(options, SUBMODULE_LOG);
3624 }
3625
3626 /* misc options */
3627 else if (!strcmp(arg, "-z"))
3628 options->line_termination = 0;
3629 else if ((argcount = short_opt('l', av, &optarg))) {
3630 options->rename_limit = strtoul(optarg, NULL, 10);
3631 return argcount;
3632 }
3633 else if ((argcount = short_opt('S', av, &optarg))) {
3634 options->pickaxe = optarg;
3635 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3636 return argcount;
3637 } else if ((argcount = short_opt('G', av, &optarg))) {
3638 options->pickaxe = optarg;
3639 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3640 return argcount;
3641 }
3642 else if (!strcmp(arg, "--pickaxe-all"))
3643 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3644 else if (!strcmp(arg, "--pickaxe-regex"))
3645 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3646 else if ((argcount = short_opt('O', av, &optarg))) {
3647 options->orderfile = optarg;
3648 return argcount;
3649 }
3650 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3651 options->filter = optarg;
3652 return argcount;
3653 }
3654 else if (!strcmp(arg, "--abbrev"))
3655 options->abbrev = DEFAULT_ABBREV;
3656 else if (!prefixcmp(arg, "--abbrev=")) {
3657 options->abbrev = strtoul(arg + 9, NULL, 10);
3658 if (options->abbrev < MINIMUM_ABBREV)
3659 options->abbrev = MINIMUM_ABBREV;
3660 else if (40 < options->abbrev)
3661 options->abbrev = 40;
3662 }
3663 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3664 options->a_prefix = optarg;
3665 return argcount;
3666 }
3667 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3668 options->b_prefix = optarg;
3669 return argcount;
3670 }
3671 else if (!strcmp(arg, "--no-prefix"))
3672 options->a_prefix = options->b_prefix = "";
3673 else if (opt_arg(arg, '\0', "inter-hunk-context",
3674 &options->interhunkcontext))
3675 ;
3676 else if (!strcmp(arg, "-W"))
3677 DIFF_OPT_SET(options, FUNCCONTEXT);
3678 else if (!strcmp(arg, "--function-context"))
3679 DIFF_OPT_SET(options, FUNCCONTEXT);
3680 else if (!strcmp(arg, "--no-function-context"))
3681 DIFF_OPT_CLR(options, FUNCCONTEXT);
3682 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3683 options->file = fopen(optarg, "w");
3684 if (!options->file)
3685 die_errno("Could not open '%s'", optarg);
3686 options->close_file = 1;
3687 return argcount;
3688 } else
3689 return 0;
3690 return 1;
3691 }
3692
3693 int parse_rename_score(const char **cp_p)
3694 {
3695 unsigned long num, scale;
3696 int ch, dot;
3697 const char *cp = *cp_p;
3698
3699 num = 0;
3700 scale = 1;
3701 dot = 0;
3702 for (;;) {
3703 ch = *cp;
3704 if ( !dot && ch == '.' ) {
3705 scale = 1;
3706 dot = 1;
3707 } else if ( ch == '%' ) {
3708 scale = dot ? scale*100 : 100;
3709 cp++; /* % is always at the end */
3710 break;
3711 } else if ( ch >= '0' && ch <= '9' ) {
3712 if ( scale < 100000 ) {
3713 scale *= 10;
3714 num = (num*10) + (ch-'0');
3715 }
3716 } else {
3717 break;
3718 }
3719 cp++;
3720 }
3721 *cp_p = cp;
3722
3723 /* user says num divided by scale and we say internally that
3724 * is MAX_SCORE * num / scale.
3725 */
3726 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3727 }
3728
3729 static int diff_scoreopt_parse(const char *opt)
3730 {
3731 int opt1, opt2, cmd;
3732
3733 if (*opt++ != '-')
3734 return -1;
3735 cmd = *opt++;
3736 if (cmd == '-') {
3737 /* convert the long-form arguments into short-form versions */
3738 if (!prefixcmp(opt, "break-rewrites")) {
3739 opt += strlen("break-rewrites");
3740 if (*opt == 0 || *opt++ == '=')
3741 cmd = 'B';
3742 } else if (!prefixcmp(opt, "find-copies")) {
3743 opt += strlen("find-copies");
3744 if (*opt == 0 || *opt++ == '=')
3745 cmd = 'C';
3746 } else if (!prefixcmp(opt, "find-renames")) {
3747 opt += strlen("find-renames");
3748 if (*opt == 0 || *opt++ == '=')
3749 cmd = 'M';
3750 }
3751 }
3752 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3753 return -1; /* that is not a -M, -C nor -B option */
3754
3755 opt1 = parse_rename_score(&opt);
3756 if (cmd != 'B')
3757 opt2 = 0;
3758 else {
3759 if (*opt == 0)
3760 opt2 = 0;
3761 else if (*opt != '/')
3762 return -1; /* we expect -B80/99 or -B80 */
3763 else {
3764 opt++;
3765 opt2 = parse_rename_score(&opt);
3766 }
3767 }
3768 if (*opt != 0)
3769 return -1;
3770 return opt1 | (opt2 << 16);
3771 }
3772
3773 struct diff_queue_struct diff_queued_diff;
3774
3775 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3776 {
3777 if (queue->alloc <= queue->nr) {
3778 queue->alloc = alloc_nr(queue->alloc);
3779 queue->queue = xrealloc(queue->queue,
3780 sizeof(dp) * queue->alloc);
3781 }
3782 queue->queue[queue->nr++] = dp;
3783 }
3784
3785 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3786 struct diff_filespec *one,
3787 struct diff_filespec *two)
3788 {
3789 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3790 dp->one = one;
3791 dp->two = two;
3792 if (queue)
3793 diff_q(queue, dp);
3794 return dp;
3795 }
3796
3797 void diff_free_filepair(struct diff_filepair *p)
3798 {
3799 free_filespec(p->one);
3800 free_filespec(p->two);
3801 free(p);
3802 }
3803
3804 /* This is different from find_unique_abbrev() in that
3805 * it stuffs the result with dots for alignment.
3806 */
3807 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3808 {
3809 int abblen;
3810 const char *abbrev;
3811 if (len == 40)
3812 return sha1_to_hex(sha1);
3813
3814 abbrev = find_unique_abbrev(sha1, len);
3815 abblen = strlen(abbrev);
3816 if (abblen < 37) {
3817 static char hex[41];
3818 if (len < abblen && abblen <= len + 2)
3819 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3820 else
3821 sprintf(hex, "%s...", abbrev);
3822 return hex;
3823 }
3824 return sha1_to_hex(sha1);
3825 }
3826
3827 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3828 {
3829 int line_termination = opt->line_termination;
3830 int inter_name_termination = line_termination ? '\t' : '\0';
3831 if (opt->output_prefix) {
3832 struct strbuf *msg = NULL;
3833 msg = opt->output_prefix(opt, opt->output_prefix_data);
3834 fprintf(opt->file, "%s", msg->buf);
3835 }
3836
3837 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3838 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3839 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3840 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3841 }
3842 if (p->score) {
3843 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3844 inter_name_termination);
3845 } else {
3846 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3847 }
3848
3849 if (p->status == DIFF_STATUS_COPIED ||
3850 p->status == DIFF_STATUS_RENAMED) {
3851 const char *name_a, *name_b;
3852 name_a = p->one->path;
3853 name_b = p->two->path;
3854 strip_prefix(opt->prefix_length, &name_a, &name_b);
3855 write_name_quoted(name_a, opt->file, inter_name_termination);
3856 write_name_quoted(name_b, opt->file, line_termination);
3857 } else {
3858 const char *name_a, *name_b;
3859 name_a = p->one->mode ? p->one->path : p->two->path;
3860 name_b = NULL;
3861 strip_prefix(opt->prefix_length, &name_a, &name_b);
3862 write_name_quoted(name_a, opt->file, line_termination);
3863 }
3864 }
3865
3866 int diff_unmodified_pair(struct diff_filepair *p)
3867 {
3868 /* This function is written stricter than necessary to support
3869 * the currently implemented transformers, but the idea is to
3870 * let transformers to produce diff_filepairs any way they want,
3871 * and filter and clean them up here before producing the output.
3872 */
3873 struct diff_filespec *one = p->one, *two = p->two;
3874
3875 if (DIFF_PAIR_UNMERGED(p))
3876 return 0; /* unmerged is interesting */
3877
3878 /* deletion, addition, mode or type change
3879 * and rename are all interesting.
3880 */
3881 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3882 DIFF_PAIR_MODE_CHANGED(p) ||
3883 strcmp(one->path, two->path))
3884 return 0;
3885
3886 /* both are valid and point at the same path. that is, we are
3887 * dealing with a change.
3888 */
3889 if (one->sha1_valid && two->sha1_valid &&
3890 !hashcmp(one->sha1, two->sha1) &&
3891 !one->dirty_submodule && !two->dirty_submodule)
3892 return 1; /* no change */
3893 if (!one->sha1_valid && !two->sha1_valid)
3894 return 1; /* both look at the same file on the filesystem. */
3895 return 0;
3896 }
3897
3898 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3899 {
3900 if (diff_unmodified_pair(p))
3901 return;
3902
3903 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3904 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3905 return; /* no tree diffs in patch format */
3906
3907 run_diff(p, o);
3908 }
3909
3910 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3911 struct diffstat_t *diffstat)
3912 {
3913 if (diff_unmodified_pair(p))
3914 return;
3915
3916 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3917 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3918 return; /* no useful stat for tree diffs */
3919
3920 run_diffstat(p, o, diffstat);
3921 }
3922
3923 static void diff_flush_checkdiff(struct diff_filepair *p,
3924 struct diff_options *o)
3925 {
3926 if (diff_unmodified_pair(p))
3927 return;
3928
3929 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3930 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3931 return; /* nothing to check in tree diffs */
3932
3933 run_checkdiff(p, o);
3934 }
3935
3936 int diff_queue_is_empty(void)
3937 {
3938 struct diff_queue_struct *q = &diff_queued_diff;
3939 int i;
3940 for (i = 0; i < q->nr; i++)
3941 if (!diff_unmodified_pair(q->queue[i]))
3942 return 0;
3943 return 1;
3944 }
3945
3946 #if DIFF_DEBUG
3947 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3948 {
3949 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3950 x, one ? one : "",
3951 s->path,
3952 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3953 s->mode,
3954 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3955 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3956 x, one ? one : "",
3957 s->size, s->xfrm_flags);
3958 }
3959
3960 void diff_debug_filepair(const struct diff_filepair *p, int i)
3961 {
3962 diff_debug_filespec(p->one, i, "one");
3963 diff_debug_filespec(p->two, i, "two");
3964 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3965 p->score, p->status ? p->status : '?',
3966 p->one->rename_used, p->broken_pair);
3967 }
3968
3969 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3970 {
3971 int i;
3972 if (msg)
3973 fprintf(stderr, "%s\n", msg);
3974 fprintf(stderr, "q->nr = %d\n", q->nr);
3975 for (i = 0; i < q->nr; i++) {
3976 struct diff_filepair *p = q->queue[i];
3977 diff_debug_filepair(p, i);
3978 }
3979 }
3980 #endif
3981
3982 static void diff_resolve_rename_copy(void)
3983 {
3984 int i;
3985 struct diff_filepair *p;
3986 struct diff_queue_struct *q = &diff_queued_diff;
3987
3988 diff_debug_queue("resolve-rename-copy", q);
3989
3990 for (i = 0; i < q->nr; i++) {
3991 p = q->queue[i];
3992 p->status = 0; /* undecided */
3993 if (DIFF_PAIR_UNMERGED(p))
3994 p->status = DIFF_STATUS_UNMERGED;
3995 else if (!DIFF_FILE_VALID(p->one))
3996 p->status = DIFF_STATUS_ADDED;
3997 else if (!DIFF_FILE_VALID(p->two))
3998 p->status = DIFF_STATUS_DELETED;
3999 else if (DIFF_PAIR_TYPE_CHANGED(p))
4000 p->status = DIFF_STATUS_TYPE_CHANGED;
4001
4002 /* from this point on, we are dealing with a pair
4003 * whose both sides are valid and of the same type, i.e.
4004 * either in-place edit or rename/copy edit.
4005 */
4006 else if (DIFF_PAIR_RENAME(p)) {
4007 /*
4008 * A rename might have re-connected a broken
4009 * pair up, causing the pathnames to be the
4010 * same again. If so, that's not a rename at
4011 * all, just a modification..
4012 *
4013 * Otherwise, see if this source was used for
4014 * multiple renames, in which case we decrement
4015 * the count, and call it a copy.
4016 */
4017 if (!strcmp(p->one->path, p->two->path))
4018 p->status = DIFF_STATUS_MODIFIED;
4019 else if (--p->one->rename_used > 0)
4020 p->status = DIFF_STATUS_COPIED;
4021 else
4022 p->status = DIFF_STATUS_RENAMED;
4023 }
4024 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4025 p->one->mode != p->two->mode ||
4026 p->one->dirty_submodule ||
4027 p->two->dirty_submodule ||
4028 is_null_sha1(p->one->sha1))
4029 p->status = DIFF_STATUS_MODIFIED;
4030 else {
4031 /* This is a "no-change" entry and should not
4032 * happen anymore, but prepare for broken callers.
4033 */
4034 error("feeding unmodified %s to diffcore",
4035 p->one->path);
4036 p->status = DIFF_STATUS_UNKNOWN;
4037 }
4038 }
4039 diff_debug_queue("resolve-rename-copy done", q);
4040 }
4041
4042 static int check_pair_status(struct diff_filepair *p)
4043 {
4044 switch (p->status) {
4045 case DIFF_STATUS_UNKNOWN:
4046 return 0;
4047 case 0:
4048 die("internal error in diff-resolve-rename-copy");
4049 default:
4050 return 1;
4051 }
4052 }
4053
4054 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4055 {
4056 int fmt = opt->output_format;
4057
4058 if (fmt & DIFF_FORMAT_CHECKDIFF)
4059 diff_flush_checkdiff(p, opt);
4060 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4061 diff_flush_raw(p, opt);
4062 else if (fmt & DIFF_FORMAT_NAME) {
4063 const char *name_a, *name_b;
4064 name_a = p->two->path;
4065 name_b = NULL;
4066 strip_prefix(opt->prefix_length, &name_a, &name_b);
4067 write_name_quoted(name_a, opt->file, opt->line_termination);
4068 }
4069 }
4070
4071 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4072 {
4073 if (fs->mode)
4074 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4075 else
4076 fprintf(file, " %s ", newdelete);
4077 write_name_quoted(fs->path, file, '\n');
4078 }
4079
4080
4081 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4082 const char *line_prefix)
4083 {
4084 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4085 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4086 p->two->mode, show_name ? ' ' : '\n');
4087 if (show_name) {
4088 write_name_quoted(p->two->path, file, '\n');
4089 }
4090 }
4091 }
4092
4093 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4094 const char *line_prefix)
4095 {
4096 char *names = pprint_rename(p->one->path, p->two->path);
4097
4098 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4099 free(names);
4100 show_mode_change(file, p, 0, line_prefix);
4101 }
4102
4103 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4104 {
4105 FILE *file = opt->file;
4106 char *line_prefix = "";
4107
4108 if (opt->output_prefix) {
4109 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4110 line_prefix = buf->buf;
4111 }
4112
4113 switch(p->status) {
4114 case DIFF_STATUS_DELETED:
4115 fputs(line_prefix, file);
4116 show_file_mode_name(file, "delete", p->one);
4117 break;
4118 case DIFF_STATUS_ADDED:
4119 fputs(line_prefix, file);
4120 show_file_mode_name(file, "create", p->two);
4121 break;
4122 case DIFF_STATUS_COPIED:
4123 fputs(line_prefix, file);
4124 show_rename_copy(file, "copy", p, line_prefix);
4125 break;
4126 case DIFF_STATUS_RENAMED:
4127 fputs(line_prefix, file);
4128 show_rename_copy(file, "rename", p, line_prefix);
4129 break;
4130 default:
4131 if (p->score) {
4132 fprintf(file, "%s rewrite ", line_prefix);
4133 write_name_quoted(p->two->path, file, ' ');
4134 fprintf(file, "(%d%%)\n", similarity_index(p));
4135 }
4136 show_mode_change(file, p, !p->score, line_prefix);
4137 break;
4138 }
4139 }
4140
4141 struct patch_id_t {
4142 git_SHA_CTX *ctx;
4143 int patchlen;
4144 };
4145
4146 static int remove_space(char *line, int len)
4147 {
4148 int i;
4149 char *dst = line;
4150 unsigned char c;
4151
4152 for (i = 0; i < len; i++)
4153 if (!isspace((c = line[i])))
4154 *dst++ = c;
4155
4156 return dst - line;
4157 }
4158
4159 static void patch_id_consume(void *priv, char *line, unsigned long len)
4160 {
4161 struct patch_id_t *data = priv;
4162 int new_len;
4163
4164 /* Ignore line numbers when computing the SHA1 of the patch */
4165 if (!prefixcmp(line, "@@ -"))
4166 return;
4167
4168 new_len = remove_space(line, len);
4169
4170 git_SHA1_Update(data->ctx, line, new_len);
4171 data->patchlen += new_len;
4172 }
4173
4174 /* returns 0 upon success, and writes result into sha1 */
4175 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4176 {
4177 struct diff_queue_struct *q = &diff_queued_diff;
4178 int i;
4179 git_SHA_CTX ctx;
4180 struct patch_id_t data;
4181 char buffer[PATH_MAX * 4 + 20];
4182
4183 git_SHA1_Init(&ctx);
4184 memset(&data, 0, sizeof(struct patch_id_t));
4185 data.ctx = &ctx;
4186
4187 for (i = 0; i < q->nr; i++) {
4188 xpparam_t xpp;
4189 xdemitconf_t xecfg;
4190 mmfile_t mf1, mf2;
4191 struct diff_filepair *p = q->queue[i];
4192 int len1, len2;
4193
4194 memset(&xpp, 0, sizeof(xpp));
4195 memset(&xecfg, 0, sizeof(xecfg));
4196 if (p->status == 0)
4197 return error("internal diff status error");
4198 if (p->status == DIFF_STATUS_UNKNOWN)
4199 continue;
4200 if (diff_unmodified_pair(p))
4201 continue;
4202 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4203 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4204 continue;
4205 if (DIFF_PAIR_UNMERGED(p))
4206 continue;
4207
4208 diff_fill_sha1_info(p->one);
4209 diff_fill_sha1_info(p->two);
4210 if (fill_mmfile(&mf1, p->one) < 0 ||
4211 fill_mmfile(&mf2, p->two) < 0)
4212 return error("unable to read files to diff");
4213
4214 len1 = remove_space(p->one->path, strlen(p->one->path));
4215 len2 = remove_space(p->two->path, strlen(p->two->path));
4216 if (p->one->mode == 0)
4217 len1 = snprintf(buffer, sizeof(buffer),
4218 "diff--gita/%.*sb/%.*s"
4219 "newfilemode%06o"
4220 "---/dev/null"
4221 "+++b/%.*s",
4222 len1, p->one->path,
4223 len2, p->two->path,
4224 p->two->mode,
4225 len2, p->two->path);
4226 else if (p->two->mode == 0)
4227 len1 = snprintf(buffer, sizeof(buffer),
4228 "diff--gita/%.*sb/%.*s"
4229 "deletedfilemode%06o"
4230 "---a/%.*s"
4231 "+++/dev/null",
4232 len1, p->one->path,
4233 len2, p->two->path,
4234 p->one->mode,
4235 len1, p->one->path);
4236 else
4237 len1 = snprintf(buffer, sizeof(buffer),
4238 "diff--gita/%.*sb/%.*s"
4239 "---a/%.*s"
4240 "+++b/%.*s",
4241 len1, p->one->path,
4242 len2, p->two->path,
4243 len1, p->one->path,
4244 len2, p->two->path);
4245 git_SHA1_Update(&ctx, buffer, len1);
4246
4247 if (diff_filespec_is_binary(p->one) ||
4248 diff_filespec_is_binary(p->two)) {
4249 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4250 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4251 continue;
4252 }
4253
4254 xpp.flags = 0;
4255 xecfg.ctxlen = 3;
4256 xecfg.flags = 0;
4257 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4258 &xpp, &xecfg);
4259 }
4260
4261 git_SHA1_Final(sha1, &ctx);
4262 return 0;
4263 }
4264
4265 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4266 {
4267 struct diff_queue_struct *q = &diff_queued_diff;
4268 int i;
4269 int result = diff_get_patch_id(options, sha1);
4270
4271 for (i = 0; i < q->nr; i++)
4272 diff_free_filepair(q->queue[i]);
4273
4274 free(q->queue);
4275 DIFF_QUEUE_CLEAR(q);
4276
4277 return result;
4278 }
4279
4280 static int is_summary_empty(const struct diff_queue_struct *q)
4281 {
4282 int i;
4283
4284 for (i = 0; i < q->nr; i++) {
4285 const struct diff_filepair *p = q->queue[i];
4286
4287 switch (p->status) {
4288 case DIFF_STATUS_DELETED:
4289 case DIFF_STATUS_ADDED:
4290 case DIFF_STATUS_COPIED:
4291 case DIFF_STATUS_RENAMED:
4292 return 0;
4293 default:
4294 if (p->score)
4295 return 0;
4296 if (p->one->mode && p->two->mode &&
4297 p->one->mode != p->two->mode)
4298 return 0;
4299 break;
4300 }
4301 }
4302 return 1;
4303 }
4304
4305 static const char rename_limit_warning[] =
4306 "inexact rename detection was skipped due to too many files.";
4307
4308 static const char degrade_cc_to_c_warning[] =
4309 "only found copies from modified paths due to too many files.";
4310
4311 static const char rename_limit_advice[] =
4312 "you may want to set your %s variable to at least "
4313 "%d and retry the command.";
4314
4315 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4316 {
4317 if (degraded_cc)
4318 warning(degrade_cc_to_c_warning);
4319 else if (needed)
4320 warning(rename_limit_warning);
4321 else
4322 return;
4323 if (0 < needed && needed < 32767)
4324 warning(rename_limit_advice, varname, needed);
4325 }
4326
4327 void diff_flush(struct diff_options *options)
4328 {
4329 struct diff_queue_struct *q = &diff_queued_diff;
4330 int i, output_format = options->output_format;
4331 int separator = 0;
4332 int dirstat_by_line = 0;
4333
4334 /*
4335 * Order: raw, stat, summary, patch
4336 * or: name/name-status/checkdiff (other bits clear)
4337 */
4338 if (!q->nr)
4339 goto free_queue;
4340
4341 if (output_format & (DIFF_FORMAT_RAW |
4342 DIFF_FORMAT_NAME |
4343 DIFF_FORMAT_NAME_STATUS |
4344 DIFF_FORMAT_CHECKDIFF)) {
4345 for (i = 0; i < q->nr; i++) {
4346 struct diff_filepair *p = q->queue[i];
4347 if (check_pair_status(p))
4348 flush_one_pair(p, options);
4349 }
4350 separator++;
4351 }
4352
4353 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4354 dirstat_by_line = 1;
4355
4356 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4357 dirstat_by_line) {
4358 struct diffstat_t diffstat;
4359
4360 memset(&diffstat, 0, sizeof(struct diffstat_t));
4361 for (i = 0; i < q->nr; i++) {
4362 struct diff_filepair *p = q->queue[i];
4363 if (check_pair_status(p))
4364 diff_flush_stat(p, options, &diffstat);
4365 }
4366 if (output_format & DIFF_FORMAT_NUMSTAT)
4367 show_numstat(&diffstat, options);
4368 if (output_format & DIFF_FORMAT_DIFFSTAT)
4369 show_stats(&diffstat, options);
4370 if (output_format & DIFF_FORMAT_SHORTSTAT)
4371 show_shortstats(&diffstat, options);
4372 if (output_format & DIFF_FORMAT_DIRSTAT)
4373 show_dirstat_by_line(&diffstat, options);
4374 free_diffstat_info(&diffstat);
4375 separator++;
4376 }
4377 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4378 show_dirstat(options);
4379
4380 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4381 for (i = 0; i < q->nr; i++) {
4382 diff_summary(options, q->queue[i]);
4383 }
4384 separator++;
4385 }
4386
4387 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4388 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4389 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4390 /*
4391 * run diff_flush_patch for the exit status. setting
4392 * options->file to /dev/null should be safe, becaue we
4393 * aren't supposed to produce any output anyway.
4394 */
4395 if (options->close_file)
4396 fclose(options->file);
4397 options->file = fopen("/dev/null", "w");
4398 if (!options->file)
4399 die_errno("Could not open /dev/null");
4400 options->close_file = 1;
4401 for (i = 0; i < q->nr; i++) {
4402 struct diff_filepair *p = q->queue[i];
4403 if (check_pair_status(p))
4404 diff_flush_patch(p, options);
4405 if (options->found_changes)
4406 break;
4407 }
4408 }
4409
4410 if (output_format & DIFF_FORMAT_PATCH) {
4411 if (separator) {
4412 putc(options->line_termination, options->file);
4413 if (options->stat_sep) {
4414 /* attach patch instead of inline */
4415 fputs(options->stat_sep, options->file);
4416 }
4417 }
4418
4419 for (i = 0; i < q->nr; i++) {
4420 struct diff_filepair *p = q->queue[i];
4421 if (check_pair_status(p))
4422 diff_flush_patch(p, options);
4423 }
4424 }
4425
4426 if (output_format & DIFF_FORMAT_CALLBACK)
4427 options->format_callback(q, options, options->format_callback_data);
4428
4429 for (i = 0; i < q->nr; i++)
4430 diff_free_filepair(q->queue[i]);
4431 free_queue:
4432 free(q->queue);
4433 DIFF_QUEUE_CLEAR(q);
4434 if (options->close_file)
4435 fclose(options->file);
4436
4437 /*
4438 * Report the content-level differences with HAS_CHANGES;
4439 * diff_addremove/diff_change does not set the bit when
4440 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4441 */
4442 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4443 if (options->found_changes)
4444 DIFF_OPT_SET(options, HAS_CHANGES);
4445 else
4446 DIFF_OPT_CLR(options, HAS_CHANGES);
4447 }
4448 }
4449
4450 static void diffcore_apply_filter(const char *filter)
4451 {
4452 int i;
4453 struct diff_queue_struct *q = &diff_queued_diff;
4454 struct diff_queue_struct outq;
4455 DIFF_QUEUE_CLEAR(&outq);
4456
4457 if (!filter)
4458 return;
4459
4460 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4461 int found;
4462 for (i = found = 0; !found && i < q->nr; i++) {
4463 struct diff_filepair *p = q->queue[i];
4464 if (((p->status == DIFF_STATUS_MODIFIED) &&
4465 ((p->score &&
4466 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4467 (!p->score &&
4468 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4469 ((p->status != DIFF_STATUS_MODIFIED) &&
4470 strchr(filter, p->status)))
4471 found++;
4472 }
4473 if (found)
4474 return;
4475
4476 /* otherwise we will clear the whole queue
4477 * by copying the empty outq at the end of this
4478 * function, but first clear the current entries
4479 * in the queue.
4480 */
4481 for (i = 0; i < q->nr; i++)
4482 diff_free_filepair(q->queue[i]);
4483 }
4484 else {
4485 /* Only the matching ones */
4486 for (i = 0; i < q->nr; i++) {
4487 struct diff_filepair *p = q->queue[i];
4488
4489 if (((p->status == DIFF_STATUS_MODIFIED) &&
4490 ((p->score &&
4491 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4492 (!p->score &&
4493 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4494 ((p->status != DIFF_STATUS_MODIFIED) &&
4495 strchr(filter, p->status)))
4496 diff_q(&outq, p);
4497 else
4498 diff_free_filepair(p);
4499 }
4500 }
4501 free(q->queue);
4502 *q = outq;
4503 }
4504
4505 /* Check whether two filespecs with the same mode and size are identical */
4506 static int diff_filespec_is_identical(struct diff_filespec *one,
4507 struct diff_filespec *two)
4508 {
4509 if (S_ISGITLINK(one->mode))
4510 return 0;
4511 if (diff_populate_filespec(one, 0))
4512 return 0;
4513 if (diff_populate_filespec(two, 0))
4514 return 0;
4515 return !memcmp(one->data, two->data, one->size);
4516 }
4517
4518 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4519 {
4520 int i;
4521 struct diff_queue_struct *q = &diff_queued_diff;
4522 struct diff_queue_struct outq;
4523 DIFF_QUEUE_CLEAR(&outq);
4524
4525 for (i = 0; i < q->nr; i++) {
4526 struct diff_filepair *p = q->queue[i];
4527
4528 /*
4529 * 1. Entries that come from stat info dirtiness
4530 * always have both sides (iow, not create/delete),
4531 * one side of the object name is unknown, with
4532 * the same mode and size. Keep the ones that
4533 * do not match these criteria. They have real
4534 * differences.
4535 *
4536 * 2. At this point, the file is known to be modified,
4537 * with the same mode and size, and the object
4538 * name of one side is unknown. Need to inspect
4539 * the identical contents.
4540 */
4541 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4542 !DIFF_FILE_VALID(p->two) ||
4543 (p->one->sha1_valid && p->two->sha1_valid) ||
4544 (p->one->mode != p->two->mode) ||
4545 diff_populate_filespec(p->one, 1) ||
4546 diff_populate_filespec(p->two, 1) ||
4547 (p->one->size != p->two->size) ||
4548 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4549 diff_q(&outq, p);
4550 else {
4551 /*
4552 * The caller can subtract 1 from skip_stat_unmatch
4553 * to determine how many paths were dirty only
4554 * due to stat info mismatch.
4555 */
4556 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4557 diffopt->skip_stat_unmatch++;
4558 diff_free_filepair(p);
4559 }
4560 }
4561 free(q->queue);
4562 *q = outq;
4563 }
4564
4565 static int diffnamecmp(const void *a_, const void *b_)
4566 {
4567 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4568 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4569 const char *name_a, *name_b;
4570
4571 name_a = a->one ? a->one->path : a->two->path;
4572 name_b = b->one ? b->one->path : b->two->path;
4573 return strcmp(name_a, name_b);
4574 }
4575
4576 void diffcore_fix_diff_index(struct diff_options *options)
4577 {
4578 struct diff_queue_struct *q = &diff_queued_diff;
4579 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4580 }
4581
4582 void diffcore_std(struct diff_options *options)
4583 {
4584 if (options->skip_stat_unmatch)
4585 diffcore_skip_stat_unmatch(options);
4586 if (!options->found_follow) {
4587 /* See try_to_follow_renames() in tree-diff.c */
4588 if (options->break_opt != -1)
4589 diffcore_break(options->break_opt);
4590 if (options->detect_rename)
4591 diffcore_rename(options);
4592 if (options->break_opt != -1)
4593 diffcore_merge_broken();
4594 }
4595 if (options->pickaxe)
4596 diffcore_pickaxe(options);
4597 if (options->orderfile)
4598 diffcore_order(options->orderfile);
4599 if (!options->found_follow)
4600 /* See try_to_follow_renames() in tree-diff.c */
4601 diff_resolve_rename_copy();
4602 diffcore_apply_filter(options->filter);
4603
4604 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4605 DIFF_OPT_SET(options, HAS_CHANGES);
4606 else
4607 DIFF_OPT_CLR(options, HAS_CHANGES);
4608
4609 options->found_follow = 0;
4610 }
4611
4612 int diff_result_code(struct diff_options *opt, int status)
4613 {
4614 int result = 0;
4615
4616 diff_warn_rename_limit("diff.renamelimit",
4617 opt->needed_rename_limit,
4618 opt->degraded_cc_to_c);
4619 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4620 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4621 return status;
4622 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4623 DIFF_OPT_TST(opt, HAS_CHANGES))
4624 result |= 01;
4625 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4626 DIFF_OPT_TST(opt, CHECK_FAILED))
4627 result |= 02;
4628 return result;
4629 }
4630
4631 int diff_can_quit_early(struct diff_options *opt)
4632 {
4633 return (DIFF_OPT_TST(opt, QUICK) &&
4634 !opt->filter &&
4635 DIFF_OPT_TST(opt, HAS_CHANGES));
4636 }
4637
4638 /*
4639 * Shall changes to this submodule be ignored?
4640 *
4641 * Submodule changes can be configured to be ignored separately for each path,
4642 * but that configuration can be overridden from the command line.
4643 */
4644 static int is_submodule_ignored(const char *path, struct diff_options *options)
4645 {
4646 int ignored = 0;
4647 unsigned orig_flags = options->flags;
4648 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4649 set_diffopt_flags_from_submodule_config(options, path);
4650 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4651 ignored = 1;
4652 options->flags = orig_flags;
4653 return ignored;
4654 }
4655
4656 void diff_addremove(struct diff_options *options,
4657 int addremove, unsigned mode,
4658 const unsigned char *sha1,
4659 const char *concatpath, unsigned dirty_submodule)
4660 {
4661 struct diff_filespec *one, *two;
4662
4663 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4664 return;
4665
4666 /* This may look odd, but it is a preparation for
4667 * feeding "there are unchanged files which should
4668 * not produce diffs, but when you are doing copy
4669 * detection you would need them, so here they are"
4670 * entries to the diff-core. They will be prefixed
4671 * with something like '=' or '*' (I haven't decided
4672 * which but should not make any difference).
4673 * Feeding the same new and old to diff_change()
4674 * also has the same effect.
4675 * Before the final output happens, they are pruned after
4676 * merged into rename/copy pairs as appropriate.
4677 */
4678 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4679 addremove = (addremove == '+' ? '-' :
4680 addremove == '-' ? '+' : addremove);
4681
4682 if (options->prefix &&
4683 strncmp(concatpath, options->prefix, options->prefix_length))
4684 return;
4685
4686 one = alloc_filespec(concatpath);
4687 two = alloc_filespec(concatpath);
4688
4689 if (addremove != '+')
4690 fill_filespec(one, sha1, mode);
4691 if (addremove != '-') {
4692 fill_filespec(two, sha1, mode);
4693 two->dirty_submodule = dirty_submodule;
4694 }
4695
4696 diff_queue(&diff_queued_diff, one, two);
4697 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4698 DIFF_OPT_SET(options, HAS_CHANGES);
4699 }
4700
4701 void diff_change(struct diff_options *options,
4702 unsigned old_mode, unsigned new_mode,
4703 const unsigned char *old_sha1,
4704 const unsigned char *new_sha1,
4705 const char *concatpath,
4706 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4707 {
4708 struct diff_filespec *one, *two;
4709
4710 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4711 is_submodule_ignored(concatpath, options))
4712 return;
4713
4714 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4715 unsigned tmp;
4716 const unsigned char *tmp_c;
4717 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4718 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4719 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4720 new_dirty_submodule = tmp;
4721 }
4722
4723 if (options->prefix &&
4724 strncmp(concatpath, options->prefix, options->prefix_length))
4725 return;
4726
4727 one = alloc_filespec(concatpath);
4728 two = alloc_filespec(concatpath);
4729 fill_filespec(one, old_sha1, old_mode);
4730 fill_filespec(two, new_sha1, new_mode);
4731 one->dirty_submodule = old_dirty_submodule;
4732 two->dirty_submodule = new_dirty_submodule;
4733
4734 diff_queue(&diff_queued_diff, one, two);
4735 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4736 DIFF_OPT_SET(options, HAS_CHANGES);
4737 }
4738
4739 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4740 {
4741 struct diff_filepair *pair;
4742 struct diff_filespec *one, *two;
4743
4744 if (options->prefix &&
4745 strncmp(path, options->prefix, options->prefix_length))
4746 return NULL;
4747
4748 one = alloc_filespec(path);
4749 two = alloc_filespec(path);
4750 pair = diff_queue(&diff_queued_diff, one, two);
4751 pair->is_unmerged = 1;
4752 return pair;
4753 }
4754
4755 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4756 size_t *outsize)
4757 {
4758 struct diff_tempfile *temp;
4759 const char *argv[3];
4760 const char **arg = argv;
4761 struct child_process child;
4762 struct strbuf buf = STRBUF_INIT;
4763 int err = 0;
4764
4765 temp = prepare_temp_file(spec->path, spec);
4766 *arg++ = pgm;
4767 *arg++ = temp->name;
4768 *arg = NULL;
4769
4770 memset(&child, 0, sizeof(child));
4771 child.use_shell = 1;
4772 child.argv = argv;
4773 child.out = -1;
4774 if (start_command(&child)) {
4775 remove_tempfile();
4776 return NULL;
4777 }
4778
4779 if (strbuf_read(&buf, child.out, 0) < 0)
4780 err = error("error reading from textconv command '%s'", pgm);
4781 close(child.out);
4782
4783 if (finish_command(&child) || err) {
4784 strbuf_release(&buf);
4785 remove_tempfile();
4786 return NULL;
4787 }
4788 remove_tempfile();
4789
4790 return strbuf_detach(&buf, outsize);
4791 }
4792
4793 size_t fill_textconv(struct userdiff_driver *driver,
4794 struct diff_filespec *df,
4795 char **outbuf)
4796 {
4797 size_t size;
4798
4799 if (!driver || !driver->textconv) {
4800 if (!DIFF_FILE_VALID(df)) {
4801 *outbuf = "";
4802 return 0;
4803 }
4804 if (diff_populate_filespec(df, 0))
4805 die("unable to read files to diff");
4806 *outbuf = df->data;
4807 return df->size;
4808 }
4809
4810 if (driver->textconv_cache && df->sha1_valid) {
4811 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4812 &size);
4813 if (*outbuf)
4814 return size;
4815 }
4816
4817 *outbuf = run_textconv(driver->textconv, df, &size);
4818 if (!*outbuf)
4819 die("unable to read files to diff");
4820
4821 if (driver->textconv_cache && df->sha1_valid) {
4822 /* ignore errors, as we might be in a readonly repository */
4823 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4824 size);
4825 /*
4826 * we could save up changes and flush them all at the end,
4827 * but we would need an extra call after all diffing is done.
4828 * Since generating a cache entry is the slow path anyway,
4829 * this extra overhead probably isn't a big deal.
4830 */
4831 notes_cache_write(driver->textconv_cache);
4832 }
4833
4834 return size;
4835 }
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