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refs: extract a function ref_resolves_to_object()
[git/debian.git] / diff.c
blobf041ab4ca52ef2f7c2b50dd528bea67b82c22adb
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18 #include "string-list.h"
19
20 #ifdef NO_FAST_WORKING_DIRECTORY
21 #define FAST_WORKING_DIRECTORY 0
22 #else
23 #define FAST_WORKING_DIRECTORY 1
24 #endif
25
26 static int diff_detect_rename_default;
27 static int diff_rename_limit_default = 400;
28 static int diff_suppress_blank_empty;
29 static int diff_use_color_default = -1;
30 static int diff_context_default = 3;
31 static const char *diff_word_regex_cfg;
32 static const char *external_diff_cmd_cfg;
33 int diff_auto_refresh_index = 1;
34 static int diff_mnemonic_prefix;
35 static int diff_no_prefix;
36 static int diff_stat_graph_width;
37 static int diff_dirstat_permille_default = 30;
38 static struct diff_options default_diff_options;
39
40 static char diff_colors[][COLOR_MAXLEN] = {
41 GIT_COLOR_RESET,
42 GIT_COLOR_NORMAL, /* PLAIN */
43 GIT_COLOR_BOLD, /* METAINFO */
44 GIT_COLOR_CYAN, /* FRAGINFO */
45 GIT_COLOR_RED, /* OLD */
46 GIT_COLOR_GREEN, /* NEW */
47 GIT_COLOR_YELLOW, /* COMMIT */
48 GIT_COLOR_BG_RED, /* WHITESPACE */
49 GIT_COLOR_NORMAL, /* FUNCINFO */
50 };
51
52 static int parse_diff_color_slot(const char *var, int ofs)
53 {
54 if (!strcasecmp(var+ofs, "plain"))
55 return DIFF_PLAIN;
56 if (!strcasecmp(var+ofs, "meta"))
57 return DIFF_METAINFO;
58 if (!strcasecmp(var+ofs, "frag"))
59 return DIFF_FRAGINFO;
60 if (!strcasecmp(var+ofs, "old"))
61 return DIFF_FILE_OLD;
62 if (!strcasecmp(var+ofs, "new"))
63 return DIFF_FILE_NEW;
64 if (!strcasecmp(var+ofs, "commit"))
65 return DIFF_COMMIT;
66 if (!strcasecmp(var+ofs, "whitespace"))
67 return DIFF_WHITESPACE;
68 if (!strcasecmp(var+ofs, "func"))
69 return DIFF_FUNCINFO;
70 return -1;
71 }
72
73 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
74 struct strbuf *errmsg)
75 {
76 char *params_copy = xstrdup(params_string);
77 struct string_list params = STRING_LIST_INIT_NODUP;
78 int ret = 0;
79 int i;
80
81 if (*params_copy)
82 string_list_split_in_place(&params, params_copy, ',', -1);
83 for (i = 0; i < params.nr; i++) {
84 const char *p = params.items[i].string;
85 if (!strcmp(p, "changes")) {
86 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
87 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
88 } else if (!strcmp(p, "lines")) {
89 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
90 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
91 } else if (!strcmp(p, "files")) {
92 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
93 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
94 } else if (!strcmp(p, "noncumulative")) {
95 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
96 } else if (!strcmp(p, "cumulative")) {
97 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
98 } else if (isdigit(*p)) {
99 char *end;
100 int permille = strtoul(p, &end, 10) * 10;
101 if (*end == '.' && isdigit(*++end)) {
102 /* only use first digit */
103 permille += *end - '0';
104 /* .. and ignore any further digits */
105 while (isdigit(*++end))
106 ; /* nothing */
107 }
108 if (!*end)
109 options->dirstat_permille = permille;
110 else {
111 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
112 p);
113 ret++;
114 }
115 } else {
116 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
117 ret++;
118 }
119
120 }
121 string_list_clear(&params, 0);
122 free(params_copy);
123 return ret;
124 }
125
126 static int parse_submodule_params(struct diff_options *options, const char *value)
127 {
128 if (!strcmp(value, "log"))
129 DIFF_OPT_SET(options, SUBMODULE_LOG);
130 else if (!strcmp(value, "short"))
131 DIFF_OPT_CLR(options, SUBMODULE_LOG);
132 else
133 return -1;
134 return 0;
135 }
136
137 static int git_config_rename(const char *var, const char *value)
138 {
139 if (!value)
140 return DIFF_DETECT_RENAME;
141 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
142 return DIFF_DETECT_COPY;
143 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
144 }
145
146 /*
147 * These are to give UI layer defaults.
148 * The core-level commands such as git-diff-files should
149 * never be affected by the setting of diff.renames
150 * the user happens to have in the configuration file.
151 */
152 int git_diff_ui_config(const char *var, const char *value, void *cb)
153 {
154 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
155 diff_use_color_default = git_config_colorbool(var, value);
156 return 0;
157 }
158 if (!strcmp(var, "diff.context")) {
159 diff_context_default = git_config_int(var, value);
160 if (diff_context_default < 0)
161 return -1;
162 return 0;
163 }
164 if (!strcmp(var, "diff.renames")) {
165 diff_detect_rename_default = git_config_rename(var, value);
166 return 0;
167 }
168 if (!strcmp(var, "diff.autorefreshindex")) {
169 diff_auto_refresh_index = git_config_bool(var, value);
170 return 0;
171 }
172 if (!strcmp(var, "diff.mnemonicprefix")) {
173 diff_mnemonic_prefix = git_config_bool(var, value);
174 return 0;
175 }
176 if (!strcmp(var, "diff.noprefix")) {
177 diff_no_prefix = git_config_bool(var, value);
178 return 0;
179 }
180 if (!strcmp(var, "diff.statgraphwidth")) {
181 diff_stat_graph_width = git_config_int(var, value);
182 return 0;
183 }
184 if (!strcmp(var, "diff.external"))
185 return git_config_string(&external_diff_cmd_cfg, var, value);
186 if (!strcmp(var, "diff.wordregex"))
187 return git_config_string(&diff_word_regex_cfg, var, value);
188
189 if (!strcmp(var, "diff.ignoresubmodules"))
190 handle_ignore_submodules_arg(&default_diff_options, value);
191
192 if (!strcmp(var, "diff.submodule")) {
193 if (parse_submodule_params(&default_diff_options, value))
194 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
195 value);
196 return 0;
197 }
198
199 if (git_color_config(var, value, cb) < 0)
200 return -1;
201
202 return git_diff_basic_config(var, value, cb);
203 }
204
205 int git_diff_basic_config(const char *var, const char *value, void *cb)
206 {
207 if (!strcmp(var, "diff.renamelimit")) {
208 diff_rename_limit_default = git_config_int(var, value);
209 return 0;
210 }
211
212 if (userdiff_config(var, value) < 0)
213 return -1;
214
215 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
216 int slot = parse_diff_color_slot(var, 11);
217 if (slot < 0)
218 return 0;
219 if (!value)
220 return config_error_nonbool(var);
221 color_parse(value, var, diff_colors[slot]);
222 return 0;
223 }
224
225 /* like GNU diff's --suppress-blank-empty option */
226 if (!strcmp(var, "diff.suppressblankempty") ||
227 /* for backwards compatibility */
228 !strcmp(var, "diff.suppress-blank-empty")) {
229 diff_suppress_blank_empty = git_config_bool(var, value);
230 return 0;
231 }
232
233 if (!strcmp(var, "diff.dirstat")) {
234 struct strbuf errmsg = STRBUF_INIT;
235 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
236 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
237 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
238 errmsg.buf);
239 strbuf_release(&errmsg);
240 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
241 return 0;
242 }
243
244 if (!prefixcmp(var, "submodule."))
245 return parse_submodule_config_option(var, value);
246
247 return git_default_config(var, value, cb);
248 }
249
250 static char *quote_two(const char *one, const char *two)
251 {
252 int need_one = quote_c_style(one, NULL, NULL, 1);
253 int need_two = quote_c_style(two, NULL, NULL, 1);
254 struct strbuf res = STRBUF_INIT;
255
256 if (need_one + need_two) {
257 strbuf_addch(&res, '"');
258 quote_c_style(one, &res, NULL, 1);
259 quote_c_style(two, &res, NULL, 1);
260 strbuf_addch(&res, '"');
261 } else {
262 strbuf_addstr(&res, one);
263 strbuf_addstr(&res, two);
264 }
265 return strbuf_detach(&res, NULL);
266 }
267
268 static const char *external_diff(void)
269 {
270 static const char *external_diff_cmd = NULL;
271 static int done_preparing = 0;
272
273 if (done_preparing)
274 return external_diff_cmd;
275 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
276 if (!external_diff_cmd)
277 external_diff_cmd = external_diff_cmd_cfg;
278 done_preparing = 1;
279 return external_diff_cmd;
280 }
281
282 static struct diff_tempfile {
283 const char *name; /* filename external diff should read from */
284 char hex[41];
285 char mode[10];
286 char tmp_path[PATH_MAX];
287 } diff_temp[2];
288
289 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
290
291 struct emit_callback {
292 int color_diff;
293 unsigned ws_rule;
294 int blank_at_eof_in_preimage;
295 int blank_at_eof_in_postimage;
296 int lno_in_preimage;
297 int lno_in_postimage;
298 sane_truncate_fn truncate;
299 const char **label_path;
300 struct diff_words_data *diff_words;
301 struct diff_options *opt;
302 int *found_changesp;
303 struct strbuf *header;
304 };
305
306 static int count_lines(const char *data, int size)
307 {
308 int count, ch, completely_empty = 1, nl_just_seen = 0;
309 count = 0;
310 while (0 < size--) {
311 ch = *data++;
312 if (ch == '\n') {
313 count++;
314 nl_just_seen = 1;
315 completely_empty = 0;
316 }
317 else {
318 nl_just_seen = 0;
319 completely_empty = 0;
320 }
321 }
322 if (completely_empty)
323 return 0;
324 if (!nl_just_seen)
325 count++; /* no trailing newline */
326 return count;
327 }
328
329 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
330 {
331 if (!DIFF_FILE_VALID(one)) {
332 mf->ptr = (char *)""; /* does not matter */
333 mf->size = 0;
334 return 0;
335 }
336 else if (diff_populate_filespec(one, 0))
337 return -1;
338
339 mf->ptr = one->data;
340 mf->size = one->size;
341 return 0;
342 }
343
344 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
345 static unsigned long diff_filespec_size(struct diff_filespec *one)
346 {
347 if (!DIFF_FILE_VALID(one))
348 return 0;
349 diff_populate_filespec(one, 1);
350 return one->size;
351 }
352
353 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
354 {
355 char *ptr = mf->ptr;
356 long size = mf->size;
357 int cnt = 0;
358
359 if (!size)
360 return cnt;
361 ptr += size - 1; /* pointing at the very end */
362 if (*ptr != '\n')
363 ; /* incomplete line */
364 else
365 ptr--; /* skip the last LF */
366 while (mf->ptr < ptr) {
367 char *prev_eol;
368 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
369 if (*prev_eol == '\n')
370 break;
371 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
372 break;
373 cnt++;
374 ptr = prev_eol - 1;
375 }
376 return cnt;
377 }
378
379 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
380 struct emit_callback *ecbdata)
381 {
382 int l1, l2, at;
383 unsigned ws_rule = ecbdata->ws_rule;
384 l1 = count_trailing_blank(mf1, ws_rule);
385 l2 = count_trailing_blank(mf2, ws_rule);
386 if (l2 <= l1) {
387 ecbdata->blank_at_eof_in_preimage = 0;
388 ecbdata->blank_at_eof_in_postimage = 0;
389 return;
390 }
391 at = count_lines(mf1->ptr, mf1->size);
392 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
393
394 at = count_lines(mf2->ptr, mf2->size);
395 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
396 }
397
398 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
399 int first, const char *line, int len)
400 {
401 int has_trailing_newline, has_trailing_carriage_return;
402 int nofirst;
403 FILE *file = o->file;
404
405 if (o->output_prefix) {
406 struct strbuf *msg = NULL;
407 msg = o->output_prefix(o, o->output_prefix_data);
408 assert(msg);
409 fwrite(msg->buf, msg->len, 1, file);
410 }
411
412 if (len == 0) {
413 has_trailing_newline = (first == '\n');
414 has_trailing_carriage_return = (!has_trailing_newline &&
415 (first == '\r'));
416 nofirst = has_trailing_newline || has_trailing_carriage_return;
417 } else {
418 has_trailing_newline = (len > 0 && line[len-1] == '\n');
419 if (has_trailing_newline)
420 len--;
421 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
422 if (has_trailing_carriage_return)
423 len--;
424 nofirst = 0;
425 }
426
427 if (len || !nofirst) {
428 fputs(set, file);
429 if (!nofirst)
430 fputc(first, file);
431 fwrite(line, len, 1, file);
432 fputs(reset, file);
433 }
434 if (has_trailing_carriage_return)
435 fputc('\r', file);
436 if (has_trailing_newline)
437 fputc('\n', file);
438 }
439
440 static void emit_line(struct diff_options *o, const char *set, const char *reset,
441 const char *line, int len)
442 {
443 emit_line_0(o, set, reset, line[0], line+1, len-1);
444 }
445
446 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
447 {
448 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
449 ecbdata->blank_at_eof_in_preimage &&
450 ecbdata->blank_at_eof_in_postimage &&
451 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
452 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
453 return 0;
454 return ws_blank_line(line, len, ecbdata->ws_rule);
455 }
456
457 static void emit_add_line(const char *reset,
458 struct emit_callback *ecbdata,
459 const char *line, int len)
460 {
461 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
462 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
463
464 if (!*ws)
465 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
466 else if (new_blank_line_at_eof(ecbdata, line, len))
467 /* Blank line at EOF - paint '+' as well */
468 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
469 else {
470 /* Emit just the prefix, then the rest. */
471 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
472 ws_check_emit(line, len, ecbdata->ws_rule,
473 ecbdata->opt->file, set, reset, ws);
474 }
475 }
476
477 static void emit_hunk_header(struct emit_callback *ecbdata,
478 const char *line, int len)
479 {
480 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
481 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
482 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
483 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
484 static const char atat[2] = { '@', '@' };
485 const char *cp, *ep;
486 struct strbuf msgbuf = STRBUF_INIT;
487 int org_len = len;
488 int i = 1;
489
490 /*
491 * As a hunk header must begin with "@@ -<old>, +<new> @@",
492 * it always is at least 10 bytes long.
493 */
494 if (len < 10 ||
495 memcmp(line, atat, 2) ||
496 !(ep = memmem(line + 2, len - 2, atat, 2))) {
497 emit_line(ecbdata->opt, plain, reset, line, len);
498 return;
499 }
500 ep += 2; /* skip over @@ */
501
502 /* The hunk header in fraginfo color */
503 strbuf_add(&msgbuf, frag, strlen(frag));
504 strbuf_add(&msgbuf, line, ep - line);
505 strbuf_add(&msgbuf, reset, strlen(reset));
506
507 /*
508 * trailing "\r\n"
509 */
510 for ( ; i < 3; i++)
511 if (line[len - i] == '\r' || line[len - i] == '\n')
512 len--;
513
514 /* blank before the func header */
515 for (cp = ep; ep - line < len; ep++)
516 if (*ep != ' ' && *ep != '\t')
517 break;
518 if (ep != cp) {
519 strbuf_add(&msgbuf, plain, strlen(plain));
520 strbuf_add(&msgbuf, cp, ep - cp);
521 strbuf_add(&msgbuf, reset, strlen(reset));
522 }
523
524 if (ep < line + len) {
525 strbuf_add(&msgbuf, func, strlen(func));
526 strbuf_add(&msgbuf, ep, line + len - ep);
527 strbuf_add(&msgbuf, reset, strlen(reset));
528 }
529
530 strbuf_add(&msgbuf, line + len, org_len - len);
531 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
532 strbuf_release(&msgbuf);
533 }
534
535 static struct diff_tempfile *claim_diff_tempfile(void) {
536 int i;
537 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
538 if (!diff_temp[i].name)
539 return diff_temp + i;
540 die("BUG: diff is failing to clean up its tempfiles");
541 }
542
543 static int remove_tempfile_installed;
544
545 static void remove_tempfile(void)
546 {
547 int i;
548 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
549 if (diff_temp[i].name == diff_temp[i].tmp_path)
550 unlink_or_warn(diff_temp[i].name);
551 diff_temp[i].name = NULL;
552 }
553 }
554
555 static void remove_tempfile_on_signal(int signo)
556 {
557 remove_tempfile();
558 sigchain_pop(signo);
559 raise(signo);
560 }
561
562 static void print_line_count(FILE *file, int count)
563 {
564 switch (count) {
565 case 0:
566 fprintf(file, "0,0");
567 break;
568 case 1:
569 fprintf(file, "1");
570 break;
571 default:
572 fprintf(file, "1,%d", count);
573 break;
574 }
575 }
576
577 static void emit_rewrite_lines(struct emit_callback *ecb,
578 int prefix, const char *data, int size)
579 {
580 const char *endp = NULL;
581 static const char *nneof = " No newline at end of file\n";
582 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
583 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
584
585 while (0 < size) {
586 int len;
587
588 endp = memchr(data, '\n', size);
589 len = endp ? (endp - data + 1) : size;
590 if (prefix != '+') {
591 ecb->lno_in_preimage++;
592 emit_line_0(ecb->opt, old, reset, '-',
593 data, len);
594 } else {
595 ecb->lno_in_postimage++;
596 emit_add_line(reset, ecb, data, len);
597 }
598 size -= len;
599 data += len;
600 }
601 if (!endp) {
602 const char *plain = diff_get_color(ecb->color_diff,
603 DIFF_PLAIN);
604 putc('\n', ecb->opt->file);
605 emit_line_0(ecb->opt, plain, reset, '\\',
606 nneof, strlen(nneof));
607 }
608 }
609
610 static void emit_rewrite_diff(const char *name_a,
611 const char *name_b,
612 struct diff_filespec *one,
613 struct diff_filespec *two,
614 struct userdiff_driver *textconv_one,
615 struct userdiff_driver *textconv_two,
616 struct diff_options *o)
617 {
618 int lc_a, lc_b;
619 const char *name_a_tab, *name_b_tab;
620 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
621 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
622 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
623 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
624 const char *a_prefix, *b_prefix;
625 char *data_one, *data_two;
626 size_t size_one, size_two;
627 struct emit_callback ecbdata;
628 char *line_prefix = "";
629 struct strbuf *msgbuf;
630
631 if (o && o->output_prefix) {
632 msgbuf = o->output_prefix(o, o->output_prefix_data);
633 line_prefix = msgbuf->buf;
634 }
635
636 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
637 a_prefix = o->b_prefix;
638 b_prefix = o->a_prefix;
639 } else {
640 a_prefix = o->a_prefix;
641 b_prefix = o->b_prefix;
642 }
643
644 name_a += (*name_a == '/');
645 name_b += (*name_b == '/');
646 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
647 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
648
649 strbuf_reset(&a_name);
650 strbuf_reset(&b_name);
651 quote_two_c_style(&a_name, a_prefix, name_a, 0);
652 quote_two_c_style(&b_name, b_prefix, name_b, 0);
653
654 size_one = fill_textconv(textconv_one, one, &data_one);
655 size_two = fill_textconv(textconv_two, two, &data_two);
656
657 memset(&ecbdata, 0, sizeof(ecbdata));
658 ecbdata.color_diff = want_color(o->use_color);
659 ecbdata.found_changesp = &o->found_changes;
660 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
661 ecbdata.opt = o;
662 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
663 mmfile_t mf1, mf2;
664 mf1.ptr = (char *)data_one;
665 mf2.ptr = (char *)data_two;
666 mf1.size = size_one;
667 mf2.size = size_two;
668 check_blank_at_eof(&mf1, &mf2, &ecbdata);
669 }
670 ecbdata.lno_in_preimage = 1;
671 ecbdata.lno_in_postimage = 1;
672
673 lc_a = count_lines(data_one, size_one);
674 lc_b = count_lines(data_two, size_two);
675 fprintf(o->file,
676 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
677 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
678 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
679 line_prefix, fraginfo);
680 if (!o->irreversible_delete)
681 print_line_count(o->file, lc_a);
682 else
683 fprintf(o->file, "?,?");
684 fprintf(o->file, " +");
685 print_line_count(o->file, lc_b);
686 fprintf(o->file, " @@%s\n", reset);
687 if (lc_a && !o->irreversible_delete)
688 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
689 if (lc_b)
690 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
691 if (textconv_one)
692 free((char *)data_one);
693 if (textconv_two)
694 free((char *)data_two);
695 }
696
697 struct diff_words_buffer {
698 mmfile_t text;
699 long alloc;
700 struct diff_words_orig {
701 const char *begin, *end;
702 } *orig;
703 int orig_nr, orig_alloc;
704 };
705
706 static void diff_words_append(char *line, unsigned long len,
707 struct diff_words_buffer *buffer)
708 {
709 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
710 line++;
711 len--;
712 memcpy(buffer->text.ptr + buffer->text.size, line, len);
713 buffer->text.size += len;
714 buffer->text.ptr[buffer->text.size] = '\0';
715 }
716
717 struct diff_words_style_elem {
718 const char *prefix;
719 const char *suffix;
720 const char *color; /* NULL; filled in by the setup code if
721 * color is enabled */
722 };
723
724 struct diff_words_style {
725 enum diff_words_type type;
726 struct diff_words_style_elem new, old, ctx;
727 const char *newline;
728 };
729
730 static struct diff_words_style diff_words_styles[] = {
731 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
732 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
733 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
734 };
735
736 struct diff_words_data {
737 struct diff_words_buffer minus, plus;
738 const char *current_plus;
739 int last_minus;
740 struct diff_options *opt;
741 regex_t *word_regex;
742 enum diff_words_type type;
743 struct diff_words_style *style;
744 };
745
746 static int fn_out_diff_words_write_helper(FILE *fp,
747 struct diff_words_style_elem *st_el,
748 const char *newline,
749 size_t count, const char *buf,
750 const char *line_prefix)
751 {
752 int print = 0;
753
754 while (count) {
755 char *p = memchr(buf, '\n', count);
756 if (print)
757 fputs(line_prefix, fp);
758 if (p != buf) {
759 if (st_el->color && fputs(st_el->color, fp) < 0)
760 return -1;
761 if (fputs(st_el->prefix, fp) < 0 ||
762 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
763 fputs(st_el->suffix, fp) < 0)
764 return -1;
765 if (st_el->color && *st_el->color
766 && fputs(GIT_COLOR_RESET, fp) < 0)
767 return -1;
768 }
769 if (!p)
770 return 0;
771 if (fputs(newline, fp) < 0)
772 return -1;
773 count -= p + 1 - buf;
774 buf = p + 1;
775 print = 1;
776 }
777 return 0;
778 }
779
780 /*
781 * '--color-words' algorithm can be described as:
782 *
783 * 1. collect a the minus/plus lines of a diff hunk, divided into
784 * minus-lines and plus-lines;
785 *
786 * 2. break both minus-lines and plus-lines into words and
787 * place them into two mmfile_t with one word for each line;
788 *
789 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
790 *
791 * And for the common parts of the both file, we output the plus side text.
792 * diff_words->current_plus is used to trace the current position of the plus file
793 * which printed. diff_words->last_minus is used to trace the last minus word
794 * printed.
795 *
796 * For '--graph' to work with '--color-words', we need to output the graph prefix
797 * on each line of color words output. Generally, there are two conditions on
798 * which we should output the prefix.
799 *
800 * 1. diff_words->last_minus == 0 &&
801 * diff_words->current_plus == diff_words->plus.text.ptr
802 *
803 * that is: the plus text must start as a new line, and if there is no minus
804 * word printed, a graph prefix must be printed.
805 *
806 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
807 * *(diff_words->current_plus - 1) == '\n'
808 *
809 * that is: a graph prefix must be printed following a '\n'
810 */
811 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
812 {
813 if ((diff_words->last_minus == 0 &&
814 diff_words->current_plus == diff_words->plus.text.ptr) ||
815 (diff_words->current_plus > diff_words->plus.text.ptr &&
816 *(diff_words->current_plus - 1) == '\n')) {
817 return 1;
818 } else {
819 return 0;
820 }
821 }
822
823 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
824 {
825 struct diff_words_data *diff_words = priv;
826 struct diff_words_style *style = diff_words->style;
827 int minus_first, minus_len, plus_first, plus_len;
828 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
829 struct diff_options *opt = diff_words->opt;
830 struct strbuf *msgbuf;
831 char *line_prefix = "";
832
833 if (line[0] != '@' || parse_hunk_header(line, len,
834 &minus_first, &minus_len, &plus_first, &plus_len))
835 return;
836
837 assert(opt);
838 if (opt->output_prefix) {
839 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
840 line_prefix = msgbuf->buf;
841 }
842
843 /* POSIX requires that first be decremented by one if len == 0... */
844 if (minus_len) {
845 minus_begin = diff_words->minus.orig[minus_first].begin;
846 minus_end =
847 diff_words->minus.orig[minus_first + minus_len - 1].end;
848 } else
849 minus_begin = minus_end =
850 diff_words->minus.orig[minus_first].end;
851
852 if (plus_len) {
853 plus_begin = diff_words->plus.orig[plus_first].begin;
854 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
855 } else
856 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
857
858 if (color_words_output_graph_prefix(diff_words)) {
859 fputs(line_prefix, diff_words->opt->file);
860 }
861 if (diff_words->current_plus != plus_begin) {
862 fn_out_diff_words_write_helper(diff_words->opt->file,
863 &style->ctx, style->newline,
864 plus_begin - diff_words->current_plus,
865 diff_words->current_plus, line_prefix);
866 if (*(plus_begin - 1) == '\n')
867 fputs(line_prefix, diff_words->opt->file);
868 }
869 if (minus_begin != minus_end) {
870 fn_out_diff_words_write_helper(diff_words->opt->file,
871 &style->old, style->newline,
872 minus_end - minus_begin, minus_begin,
873 line_prefix);
874 }
875 if (plus_begin != plus_end) {
876 fn_out_diff_words_write_helper(diff_words->opt->file,
877 &style->new, style->newline,
878 plus_end - plus_begin, plus_begin,
879 line_prefix);
880 }
881
882 diff_words->current_plus = plus_end;
883 diff_words->last_minus = minus_first;
884 }
885
886 /* This function starts looking at *begin, and returns 0 iff a word was found. */
887 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
888 int *begin, int *end)
889 {
890 if (word_regex && *begin < buffer->size) {
891 regmatch_t match[1];
892 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
893 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
894 '\n', match[0].rm_eo - match[0].rm_so);
895 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
896 *begin += match[0].rm_so;
897 return *begin >= *end;
898 }
899 return -1;
900 }
901
902 /* find the next word */
903 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
904 (*begin)++;
905 if (*begin >= buffer->size)
906 return -1;
907
908 /* find the end of the word */
909 *end = *begin + 1;
910 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
911 (*end)++;
912
913 return 0;
914 }
915
916 /*
917 * This function splits the words in buffer->text, stores the list with
918 * newline separator into out, and saves the offsets of the original words
919 * in buffer->orig.
920 */
921 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
922 regex_t *word_regex)
923 {
924 int i, j;
925 long alloc = 0;
926
927 out->size = 0;
928 out->ptr = NULL;
929
930 /* fake an empty "0th" word */
931 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
932 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
933 buffer->orig_nr = 1;
934
935 for (i = 0; i < buffer->text.size; i++) {
936 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
937 return;
938
939 /* store original boundaries */
940 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
941 buffer->orig_alloc);
942 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
943 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
944 buffer->orig_nr++;
945
946 /* store one word */
947 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
948 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
949 out->ptr[out->size + j - i] = '\n';
950 out->size += j - i + 1;
951
952 i = j - 1;
953 }
954 }
955
956 /* this executes the word diff on the accumulated buffers */
957 static void diff_words_show(struct diff_words_data *diff_words)
958 {
959 xpparam_t xpp;
960 xdemitconf_t xecfg;
961 mmfile_t minus, plus;
962 struct diff_words_style *style = diff_words->style;
963
964 struct diff_options *opt = diff_words->opt;
965 struct strbuf *msgbuf;
966 char *line_prefix = "";
967
968 assert(opt);
969 if (opt->output_prefix) {
970 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
971 line_prefix = msgbuf->buf;
972 }
973
974 /* special case: only removal */
975 if (!diff_words->plus.text.size) {
976 fputs(line_prefix, diff_words->opt->file);
977 fn_out_diff_words_write_helper(diff_words->opt->file,
978 &style->old, style->newline,
979 diff_words->minus.text.size,
980 diff_words->minus.text.ptr, line_prefix);
981 diff_words->minus.text.size = 0;
982 return;
983 }
984
985 diff_words->current_plus = diff_words->plus.text.ptr;
986 diff_words->last_minus = 0;
987
988 memset(&xpp, 0, sizeof(xpp));
989 memset(&xecfg, 0, sizeof(xecfg));
990 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
991 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
992 xpp.flags = 0;
993 /* as only the hunk header will be parsed, we need a 0-context */
994 xecfg.ctxlen = 0;
995 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
996 &xpp, &xecfg);
997 free(minus.ptr);
998 free(plus.ptr);
999 if (diff_words->current_plus != diff_words->plus.text.ptr +
1000 diff_words->plus.text.size) {
1001 if (color_words_output_graph_prefix(diff_words))
1002 fputs(line_prefix, diff_words->opt->file);
1003 fn_out_diff_words_write_helper(diff_words->opt->file,
1004 &style->ctx, style->newline,
1005 diff_words->plus.text.ptr + diff_words->plus.text.size
1006 - diff_words->current_plus, diff_words->current_plus,
1007 line_prefix);
1008 }
1009 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1010 }
1011
1012 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1013 static void diff_words_flush(struct emit_callback *ecbdata)
1014 {
1015 if (ecbdata->diff_words->minus.text.size ||
1016 ecbdata->diff_words->plus.text.size)
1017 diff_words_show(ecbdata->diff_words);
1018 }
1019
1020 static void diff_filespec_load_driver(struct diff_filespec *one)
1021 {
1022 /* Use already-loaded driver */
1023 if (one->driver)
1024 return;
1025
1026 if (S_ISREG(one->mode))
1027 one->driver = userdiff_find_by_path(one->path);
1028
1029 /* Fallback to default settings */
1030 if (!one->driver)
1031 one->driver = userdiff_find_by_name("default");
1032 }
1033
1034 static const char *userdiff_word_regex(struct diff_filespec *one)
1035 {
1036 diff_filespec_load_driver(one);
1037 return one->driver->word_regex;
1038 }
1039
1040 static void init_diff_words_data(struct emit_callback *ecbdata,
1041 struct diff_options *orig_opts,
1042 struct diff_filespec *one,
1043 struct diff_filespec *two)
1044 {
1045 int i;
1046 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1047 memcpy(o, orig_opts, sizeof(struct diff_options));
1048
1049 ecbdata->diff_words =
1050 xcalloc(1, sizeof(struct diff_words_data));
1051 ecbdata->diff_words->type = o->word_diff;
1052 ecbdata->diff_words->opt = o;
1053 if (!o->word_regex)
1054 o->word_regex = userdiff_word_regex(one);
1055 if (!o->word_regex)
1056 o->word_regex = userdiff_word_regex(two);
1057 if (!o->word_regex)
1058 o->word_regex = diff_word_regex_cfg;
1059 if (o->word_regex) {
1060 ecbdata->diff_words->word_regex = (regex_t *)
1061 xmalloc(sizeof(regex_t));
1062 if (regcomp(ecbdata->diff_words->word_regex,
1063 o->word_regex,
1064 REG_EXTENDED | REG_NEWLINE))
1065 die ("Invalid regular expression: %s",
1066 o->word_regex);
1067 }
1068 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1069 if (o->word_diff == diff_words_styles[i].type) {
1070 ecbdata->diff_words->style =
1071 &diff_words_styles[i];
1072 break;
1073 }
1074 }
1075 if (want_color(o->use_color)) {
1076 struct diff_words_style *st = ecbdata->diff_words->style;
1077 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1078 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1079 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1080 }
1081 }
1082
1083 static void free_diff_words_data(struct emit_callback *ecbdata)
1084 {
1085 if (ecbdata->diff_words) {
1086 diff_words_flush(ecbdata);
1087 free (ecbdata->diff_words->opt);
1088 free (ecbdata->diff_words->minus.text.ptr);
1089 free (ecbdata->diff_words->minus.orig);
1090 free (ecbdata->diff_words->plus.text.ptr);
1091 free (ecbdata->diff_words->plus.orig);
1092 if (ecbdata->diff_words->word_regex) {
1093 regfree(ecbdata->diff_words->word_regex);
1094 free(ecbdata->diff_words->word_regex);
1095 }
1096 free(ecbdata->diff_words);
1097 ecbdata->diff_words = NULL;
1098 }
1099 }
1100
1101 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1102 {
1103 if (want_color(diff_use_color))
1104 return diff_colors[ix];
1105 return "";
1106 }
1107
1108 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1109 {
1110 const char *cp;
1111 unsigned long allot;
1112 size_t l = len;
1113
1114 if (ecb->truncate)
1115 return ecb->truncate(line, len);
1116 cp = line;
1117 allot = l;
1118 while (0 < l) {
1119 (void) utf8_width(&cp, &l);
1120 if (!cp)
1121 break; /* truncated in the middle? */
1122 }
1123 return allot - l;
1124 }
1125
1126 static void find_lno(const char *line, struct emit_callback *ecbdata)
1127 {
1128 const char *p;
1129 ecbdata->lno_in_preimage = 0;
1130 ecbdata->lno_in_postimage = 0;
1131 p = strchr(line, '-');
1132 if (!p)
1133 return; /* cannot happen */
1134 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1135 p = strchr(p, '+');
1136 if (!p)
1137 return; /* cannot happen */
1138 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1139 }
1140
1141 static void fn_out_consume(void *priv, char *line, unsigned long len)
1142 {
1143 struct emit_callback *ecbdata = priv;
1144 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1145 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1146 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1147 struct diff_options *o = ecbdata->opt;
1148 char *line_prefix = "";
1149 struct strbuf *msgbuf;
1150
1151 if (o && o->output_prefix) {
1152 msgbuf = o->output_prefix(o, o->output_prefix_data);
1153 line_prefix = msgbuf->buf;
1154 }
1155
1156 if (ecbdata->header) {
1157 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1158 strbuf_reset(ecbdata->header);
1159 ecbdata->header = NULL;
1160 }
1161 *(ecbdata->found_changesp) = 1;
1162
1163 if (ecbdata->label_path[0]) {
1164 const char *name_a_tab, *name_b_tab;
1165
1166 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1167 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1168
1169 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1170 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1171 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1172 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1173 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1174 }
1175
1176 if (diff_suppress_blank_empty
1177 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1178 line[0] = '\n';
1179 len = 1;
1180 }
1181
1182 if (line[0] == '@') {
1183 if (ecbdata->diff_words)
1184 diff_words_flush(ecbdata);
1185 len = sane_truncate_line(ecbdata, line, len);
1186 find_lno(line, ecbdata);
1187 emit_hunk_header(ecbdata, line, len);
1188 if (line[len-1] != '\n')
1189 putc('\n', ecbdata->opt->file);
1190 return;
1191 }
1192
1193 if (len < 1) {
1194 emit_line(ecbdata->opt, reset, reset, line, len);
1195 if (ecbdata->diff_words
1196 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1197 fputs("~\n", ecbdata->opt->file);
1198 return;
1199 }
1200
1201 if (ecbdata->diff_words) {
1202 if (line[0] == '-') {
1203 diff_words_append(line, len,
1204 &ecbdata->diff_words->minus);
1205 return;
1206 } else if (line[0] == '+') {
1207 diff_words_append(line, len,
1208 &ecbdata->diff_words->plus);
1209 return;
1210 } else if (!prefixcmp(line, "\\ ")) {
1211 /*
1212 * Eat the "no newline at eof" marker as if we
1213 * saw a "+" or "-" line with nothing on it,
1214 * and return without diff_words_flush() to
1215 * defer processing. If this is the end of
1216 * preimage, more "+" lines may come after it.
1217 */
1218 return;
1219 }
1220 diff_words_flush(ecbdata);
1221 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1222 emit_line(ecbdata->opt, plain, reset, line, len);
1223 fputs("~\n", ecbdata->opt->file);
1224 } else {
1225 /*
1226 * Skip the prefix character, if any. With
1227 * diff_suppress_blank_empty, there may be
1228 * none.
1229 */
1230 if (line[0] != '\n') {
1231 line++;
1232 len--;
1233 }
1234 emit_line(ecbdata->opt, plain, reset, line, len);
1235 }
1236 return;
1237 }
1238
1239 if (line[0] != '+') {
1240 const char *color =
1241 diff_get_color(ecbdata->color_diff,
1242 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1243 ecbdata->lno_in_preimage++;
1244 if (line[0] == ' ')
1245 ecbdata->lno_in_postimage++;
1246 emit_line(ecbdata->opt, color, reset, line, len);
1247 } else {
1248 ecbdata->lno_in_postimage++;
1249 emit_add_line(reset, ecbdata, line + 1, len - 1);
1250 }
1251 }
1252
1253 static char *pprint_rename(const char *a, const char *b)
1254 {
1255 const char *old = a;
1256 const char *new = b;
1257 struct strbuf name = STRBUF_INIT;
1258 int pfx_length, sfx_length;
1259 int pfx_adjust_for_slash;
1260 int len_a = strlen(a);
1261 int len_b = strlen(b);
1262 int a_midlen, b_midlen;
1263 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1264 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1265
1266 if (qlen_a || qlen_b) {
1267 quote_c_style(a, &name, NULL, 0);
1268 strbuf_addstr(&name, " => ");
1269 quote_c_style(b, &name, NULL, 0);
1270 return strbuf_detach(&name, NULL);
1271 }
1272
1273 /* Find common prefix */
1274 pfx_length = 0;
1275 while (*old && *new && *old == *new) {
1276 if (*old == '/')
1277 pfx_length = old - a + 1;
1278 old++;
1279 new++;
1280 }
1281
1282 /* Find common suffix */
1283 old = a + len_a;
1284 new = b + len_b;
1285 sfx_length = 0;
1286 /*
1287 * If there is a common prefix, it must end in a slash. In
1288 * that case we let this loop run 1 into the prefix to see the
1289 * same slash.
1290 *
1291 * If there is no common prefix, we cannot do this as it would
1292 * underrun the input strings.
1293 */
1294 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1295 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1296 b + pfx_length - pfx_adjust_for_slash <= new &&
1297 *old == *new) {
1298 if (*old == '/')
1299 sfx_length = len_a - (old - a);
1300 old--;
1301 new--;
1302 }
1303
1304 /*
1305 * pfx{mid-a => mid-b}sfx
1306 * {pfx-a => pfx-b}sfx
1307 * pfx{sfx-a => sfx-b}
1308 * name-a => name-b
1309 */
1310 a_midlen = len_a - pfx_length - sfx_length;
1311 b_midlen = len_b - pfx_length - sfx_length;
1312 if (a_midlen < 0)
1313 a_midlen = 0;
1314 if (b_midlen < 0)
1315 b_midlen = 0;
1316
1317 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1318 if (pfx_length + sfx_length) {
1319 strbuf_add(&name, a, pfx_length);
1320 strbuf_addch(&name, '{');
1321 }
1322 strbuf_add(&name, a + pfx_length, a_midlen);
1323 strbuf_addstr(&name, " => ");
1324 strbuf_add(&name, b + pfx_length, b_midlen);
1325 if (pfx_length + sfx_length) {
1326 strbuf_addch(&name, '}');
1327 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1328 }
1329 return strbuf_detach(&name, NULL);
1330 }
1331
1332 struct diffstat_t {
1333 int nr;
1334 int alloc;
1335 struct diffstat_file {
1336 char *from_name;
1337 char *name;
1338 char *print_name;
1339 unsigned is_unmerged:1;
1340 unsigned is_binary:1;
1341 unsigned is_renamed:1;
1342 unsigned is_interesting:1;
1343 uintmax_t added, deleted;
1344 } **files;
1345 };
1346
1347 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1348 const char *name_a,
1349 const char *name_b)
1350 {
1351 struct diffstat_file *x;
1352 x = xcalloc(sizeof (*x), 1);
1353 if (diffstat->nr == diffstat->alloc) {
1354 diffstat->alloc = alloc_nr(diffstat->alloc);
1355 diffstat->files = xrealloc(diffstat->files,
1356 diffstat->alloc * sizeof(x));
1357 }
1358 diffstat->files[diffstat->nr++] = x;
1359 if (name_b) {
1360 x->from_name = xstrdup(name_a);
1361 x->name = xstrdup(name_b);
1362 x->is_renamed = 1;
1363 }
1364 else {
1365 x->from_name = NULL;
1366 x->name = xstrdup(name_a);
1367 }
1368 return x;
1369 }
1370
1371 static void diffstat_consume(void *priv, char *line, unsigned long len)
1372 {
1373 struct diffstat_t *diffstat = priv;
1374 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1375
1376 if (line[0] == '+')
1377 x->added++;
1378 else if (line[0] == '-')
1379 x->deleted++;
1380 }
1381
1382 const char mime_boundary_leader[] = "------------";
1383
1384 static int scale_linear(int it, int width, int max_change)
1385 {
1386 if (!it)
1387 return 0;
1388 /*
1389 * make sure that at least one '-' or '+' is printed if
1390 * there is any change to this path. The easiest way is to
1391 * scale linearly as if the alloted width is one column shorter
1392 * than it is, and then add 1 to the result.
1393 */
1394 return 1 + (it * (width - 1) / max_change);
1395 }
1396
1397 static void show_name(FILE *file,
1398 const char *prefix, const char *name, int len)
1399 {
1400 fprintf(file, " %s%-*s |", prefix, len, name);
1401 }
1402
1403 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1404 {
1405 if (cnt <= 0)
1406 return;
1407 fprintf(file, "%s", set);
1408 while (cnt--)
1409 putc(ch, file);
1410 fprintf(file, "%s", reset);
1411 }
1412
1413 static void fill_print_name(struct diffstat_file *file)
1414 {
1415 char *pname;
1416
1417 if (file->print_name)
1418 return;
1419
1420 if (!file->is_renamed) {
1421 struct strbuf buf = STRBUF_INIT;
1422 if (quote_c_style(file->name, &buf, NULL, 0)) {
1423 pname = strbuf_detach(&buf, NULL);
1424 } else {
1425 pname = file->name;
1426 strbuf_release(&buf);
1427 }
1428 } else {
1429 pname = pprint_rename(file->from_name, file->name);
1430 }
1431 file->print_name = pname;
1432 }
1433
1434 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1435 {
1436 struct strbuf sb = STRBUF_INIT;
1437 int ret;
1438
1439 if (!files) {
1440 assert(insertions == 0 && deletions == 0);
1441 return fprintf(fp, "%s\n", " 0 files changed");
1442 }
1443
1444 strbuf_addf(&sb,
1445 (files == 1) ? " %d file changed" : " %d files changed",
1446 files);
1447
1448 /*
1449 * For binary diff, the caller may want to print "x files
1450 * changed" with insertions == 0 && deletions == 0.
1451 *
1452 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1453 * is probably less confusing (i.e skip over "2 files changed
1454 * but nothing about added/removed lines? Is this a bug in Git?").
1455 */
1456 if (insertions || deletions == 0) {
1457 /*
1458 * TRANSLATORS: "+" in (+) is a line addition marker;
1459 * do not translate it.
1460 */
1461 strbuf_addf(&sb,
1462 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1463 insertions);
1464 }
1465
1466 if (deletions || insertions == 0) {
1467 /*
1468 * TRANSLATORS: "-" in (-) is a line removal marker;
1469 * do not translate it.
1470 */
1471 strbuf_addf(&sb,
1472 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1473 deletions);
1474 }
1475 strbuf_addch(&sb, '\n');
1476 ret = fputs(sb.buf, fp);
1477 strbuf_release(&sb);
1478 return ret;
1479 }
1480
1481 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1482 {
1483 int i, len, add, del, adds = 0, dels = 0;
1484 uintmax_t max_change = 0, max_len = 0;
1485 int total_files = data->nr, count;
1486 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1487 const char *reset, *add_c, *del_c;
1488 const char *line_prefix = "";
1489 int extra_shown = 0;
1490 struct strbuf *msg = NULL;
1491
1492 if (data->nr == 0)
1493 return;
1494
1495 if (options->output_prefix) {
1496 msg = options->output_prefix(options, options->output_prefix_data);
1497 line_prefix = msg->buf;
1498 }
1499
1500 count = options->stat_count ? options->stat_count : data->nr;
1501
1502 reset = diff_get_color_opt(options, DIFF_RESET);
1503 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1504 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1505
1506 /*
1507 * Find the longest filename and max number of changes
1508 */
1509 for (i = 0; (i < count) && (i < data->nr); i++) {
1510 struct diffstat_file *file = data->files[i];
1511 uintmax_t change = file->added + file->deleted;
1512
1513 if (!file->is_interesting && (change == 0)) {
1514 count++; /* not shown == room for one more */
1515 continue;
1516 }
1517 fill_print_name(file);
1518 len = strlen(file->print_name);
1519 if (max_len < len)
1520 max_len = len;
1521
1522 if (file->is_unmerged) {
1523 /* "Unmerged" is 8 characters */
1524 bin_width = bin_width < 8 ? 8 : bin_width;
1525 continue;
1526 }
1527 if (file->is_binary) {
1528 /* "Bin XXX -> YYY bytes" */
1529 int w = 14 + decimal_width(file->added)
1530 + decimal_width(file->deleted);
1531 bin_width = bin_width < w ? w : bin_width;
1532 /* Display change counts aligned with "Bin" */
1533 number_width = 3;
1534 continue;
1535 }
1536
1537 if (max_change < change)
1538 max_change = change;
1539 }
1540 count = i; /* where we can stop scanning in data->files[] */
1541
1542 /*
1543 * We have width = stat_width or term_columns() columns total.
1544 * We want a maximum of min(max_len, stat_name_width) for the name part.
1545 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1546 * We also need 1 for " " and 4 + decimal_width(max_change)
1547 * for " | NNNN " and one the empty column at the end, altogether
1548 * 6 + decimal_width(max_change).
1549 *
1550 * If there's not enough space, we will use the smaller of
1551 * stat_name_width (if set) and 5/8*width for the filename,
1552 * and the rest for constant elements + graph part, but no more
1553 * than stat_graph_width for the graph part.
1554 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1555 * for the standard terminal size).
1556 *
1557 * In other words: stat_width limits the maximum width, and
1558 * stat_name_width fixes the maximum width of the filename,
1559 * and is also used to divide available columns if there
1560 * aren't enough.
1561 *
1562 * Binary files are displayed with "Bin XXX -> YYY bytes"
1563 * instead of the change count and graph. This part is treated
1564 * similarly to the graph part, except that it is not
1565 * "scaled". If total width is too small to accomodate the
1566 * guaranteed minimum width of the filename part and the
1567 * separators and this message, this message will "overflow"
1568 * making the line longer than the maximum width.
1569 */
1570
1571 if (options->stat_width == -1)
1572 width = term_columns() - options->output_prefix_length;
1573 else
1574 width = options->stat_width ? options->stat_width : 80;
1575 number_width = decimal_width(max_change) > number_width ?
1576 decimal_width(max_change) : number_width;
1577
1578 if (options->stat_graph_width == -1)
1579 options->stat_graph_width = diff_stat_graph_width;
1580
1581 /*
1582 * Guarantee 3/8*16==6 for the graph part
1583 * and 5/8*16==10 for the filename part
1584 */
1585 if (width < 16 + 6 + number_width)
1586 width = 16 + 6 + number_width;
1587
1588 /*
1589 * First assign sizes that are wanted, ignoring available width.
1590 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1591 * starting from "XXX" should fit in graph_width.
1592 */
1593 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1594 if (options->stat_graph_width &&
1595 options->stat_graph_width < graph_width)
1596 graph_width = options->stat_graph_width;
1597
1598 name_width = (options->stat_name_width > 0 &&
1599 options->stat_name_width < max_len) ?
1600 options->stat_name_width : max_len;
1601
1602 /*
1603 * Adjust adjustable widths not to exceed maximum width
1604 */
1605 if (name_width + number_width + 6 + graph_width > width) {
1606 if (graph_width > width * 3/8 - number_width - 6) {
1607 graph_width = width * 3/8 - number_width - 6;
1608 if (graph_width < 6)
1609 graph_width = 6;
1610 }
1611
1612 if (options->stat_graph_width &&
1613 graph_width > options->stat_graph_width)
1614 graph_width = options->stat_graph_width;
1615 if (name_width > width - number_width - 6 - graph_width)
1616 name_width = width - number_width - 6 - graph_width;
1617 else
1618 graph_width = width - number_width - 6 - name_width;
1619 }
1620
1621 /*
1622 * From here name_width is the width of the name area,
1623 * and graph_width is the width of the graph area.
1624 * max_change is used to scale graph properly.
1625 */
1626 for (i = 0; i < count; i++) {
1627 const char *prefix = "";
1628 struct diffstat_file *file = data->files[i];
1629 char *name = file->print_name;
1630 uintmax_t added = file->added;
1631 uintmax_t deleted = file->deleted;
1632 int name_len;
1633
1634 if (!file->is_interesting && (added + deleted == 0))
1635 continue;
1636
1637 /*
1638 * "scale" the filename
1639 */
1640 len = name_width;
1641 name_len = strlen(name);
1642 if (name_width < name_len) {
1643 char *slash;
1644 prefix = "...";
1645 len -= 3;
1646 name += name_len - len;
1647 slash = strchr(name, '/');
1648 if (slash)
1649 name = slash;
1650 }
1651
1652 if (file->is_binary) {
1653 fprintf(options->file, "%s", line_prefix);
1654 show_name(options->file, prefix, name, len);
1655 fprintf(options->file, " %*s", number_width, "Bin");
1656 if (!added && !deleted) {
1657 putc('\n', options->file);
1658 continue;
1659 }
1660 fprintf(options->file, " %s%"PRIuMAX"%s",
1661 del_c, deleted, reset);
1662 fprintf(options->file, " -> ");
1663 fprintf(options->file, "%s%"PRIuMAX"%s",
1664 add_c, added, reset);
1665 fprintf(options->file, " bytes");
1666 fprintf(options->file, "\n");
1667 continue;
1668 }
1669 else if (file->is_unmerged) {
1670 fprintf(options->file, "%s", line_prefix);
1671 show_name(options->file, prefix, name, len);
1672 fprintf(options->file, " Unmerged\n");
1673 continue;
1674 }
1675
1676 /*
1677 * scale the add/delete
1678 */
1679 add = added;
1680 del = deleted;
1681
1682 if (graph_width <= max_change) {
1683 int total = add + del;
1684
1685 total = scale_linear(add + del, graph_width, max_change);
1686 if (total < 2 && add && del)
1687 /* width >= 2 due to the sanity check */
1688 total = 2;
1689 if (add < del) {
1690 add = scale_linear(add, graph_width, max_change);
1691 del = total - add;
1692 } else {
1693 del = scale_linear(del, graph_width, max_change);
1694 add = total - del;
1695 }
1696 }
1697 fprintf(options->file, "%s", line_prefix);
1698 show_name(options->file, prefix, name, len);
1699 fprintf(options->file, " %*"PRIuMAX"%s",
1700 number_width, added + deleted,
1701 added + deleted ? " " : "");
1702 show_graph(options->file, '+', add, add_c, reset);
1703 show_graph(options->file, '-', del, del_c, reset);
1704 fprintf(options->file, "\n");
1705 }
1706
1707 for (i = 0; i < data->nr; i++) {
1708 struct diffstat_file *file = data->files[i];
1709 uintmax_t added = file->added;
1710 uintmax_t deleted = file->deleted;
1711
1712 if (file->is_unmerged ||
1713 (!file->is_interesting && (added + deleted == 0))) {
1714 total_files--;
1715 continue;
1716 }
1717
1718 if (!file->is_binary) {
1719 adds += added;
1720 dels += deleted;
1721 }
1722 if (i < count)
1723 continue;
1724 if (!extra_shown)
1725 fprintf(options->file, "%s ...\n", line_prefix);
1726 extra_shown = 1;
1727 }
1728 fprintf(options->file, "%s", line_prefix);
1729 print_stat_summary(options->file, total_files, adds, dels);
1730 }
1731
1732 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1733 {
1734 int i, adds = 0, dels = 0, total_files = data->nr;
1735
1736 if (data->nr == 0)
1737 return;
1738
1739 for (i = 0; i < data->nr; i++) {
1740 int added = data->files[i]->added;
1741 int deleted= data->files[i]->deleted;
1742
1743 if (data->files[i]->is_unmerged ||
1744 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1745 total_files--;
1746 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1747 adds += added;
1748 dels += deleted;
1749 }
1750 }
1751 if (options->output_prefix) {
1752 struct strbuf *msg = NULL;
1753 msg = options->output_prefix(options,
1754 options->output_prefix_data);
1755 fprintf(options->file, "%s", msg->buf);
1756 }
1757 print_stat_summary(options->file, total_files, adds, dels);
1758 }
1759
1760 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1761 {
1762 int i;
1763
1764 if (data->nr == 0)
1765 return;
1766
1767 for (i = 0; i < data->nr; i++) {
1768 struct diffstat_file *file = data->files[i];
1769
1770 if (options->output_prefix) {
1771 struct strbuf *msg = NULL;
1772 msg = options->output_prefix(options,
1773 options->output_prefix_data);
1774 fprintf(options->file, "%s", msg->buf);
1775 }
1776
1777 if (file->is_binary)
1778 fprintf(options->file, "-\t-\t");
1779 else
1780 fprintf(options->file,
1781 "%"PRIuMAX"\t%"PRIuMAX"\t",
1782 file->added, file->deleted);
1783 if (options->line_termination) {
1784 fill_print_name(file);
1785 if (!file->is_renamed)
1786 write_name_quoted(file->name, options->file,
1787 options->line_termination);
1788 else {
1789 fputs(file->print_name, options->file);
1790 putc(options->line_termination, options->file);
1791 }
1792 } else {
1793 if (file->is_renamed) {
1794 putc('\0', options->file);
1795 write_name_quoted(file->from_name, options->file, '\0');
1796 }
1797 write_name_quoted(file->name, options->file, '\0');
1798 }
1799 }
1800 }
1801
1802 struct dirstat_file {
1803 const char *name;
1804 unsigned long changed;
1805 };
1806
1807 struct dirstat_dir {
1808 struct dirstat_file *files;
1809 int alloc, nr, permille, cumulative;
1810 };
1811
1812 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1813 unsigned long changed, const char *base, int baselen)
1814 {
1815 unsigned long this_dir = 0;
1816 unsigned int sources = 0;
1817 const char *line_prefix = "";
1818 struct strbuf *msg = NULL;
1819
1820 if (opt->output_prefix) {
1821 msg = opt->output_prefix(opt, opt->output_prefix_data);
1822 line_prefix = msg->buf;
1823 }
1824
1825 while (dir->nr) {
1826 struct dirstat_file *f = dir->files;
1827 int namelen = strlen(f->name);
1828 unsigned long this;
1829 char *slash;
1830
1831 if (namelen < baselen)
1832 break;
1833 if (memcmp(f->name, base, baselen))
1834 break;
1835 slash = strchr(f->name + baselen, '/');
1836 if (slash) {
1837 int newbaselen = slash + 1 - f->name;
1838 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1839 sources++;
1840 } else {
1841 this = f->changed;
1842 dir->files++;
1843 dir->nr--;
1844 sources += 2;
1845 }
1846 this_dir += this;
1847 }
1848
1849 /*
1850 * We don't report dirstat's for
1851 * - the top level
1852 * - or cases where everything came from a single directory
1853 * under this directory (sources == 1).
1854 */
1855 if (baselen && sources != 1) {
1856 if (this_dir) {
1857 int permille = this_dir * 1000 / changed;
1858 if (permille >= dir->permille) {
1859 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1860 permille / 10, permille % 10, baselen, base);
1861 if (!dir->cumulative)
1862 return 0;
1863 }
1864 }
1865 }
1866 return this_dir;
1867 }
1868
1869 static int dirstat_compare(const void *_a, const void *_b)
1870 {
1871 const struct dirstat_file *a = _a;
1872 const struct dirstat_file *b = _b;
1873 return strcmp(a->name, b->name);
1874 }
1875
1876 static void show_dirstat(struct diff_options *options)
1877 {
1878 int i;
1879 unsigned long changed;
1880 struct dirstat_dir dir;
1881 struct diff_queue_struct *q = &diff_queued_diff;
1882
1883 dir.files = NULL;
1884 dir.alloc = 0;
1885 dir.nr = 0;
1886 dir.permille = options->dirstat_permille;
1887 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1888
1889 changed = 0;
1890 for (i = 0; i < q->nr; i++) {
1891 struct diff_filepair *p = q->queue[i];
1892 const char *name;
1893 unsigned long copied, added, damage;
1894 int content_changed;
1895
1896 name = p->two->path ? p->two->path : p->one->path;
1897
1898 if (p->one->sha1_valid && p->two->sha1_valid)
1899 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1900 else
1901 content_changed = 1;
1902
1903 if (!content_changed) {
1904 /*
1905 * The SHA1 has not changed, so pre-/post-content is
1906 * identical. We can therefore skip looking at the
1907 * file contents altogether.
1908 */
1909 damage = 0;
1910 goto found_damage;
1911 }
1912
1913 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1914 /*
1915 * In --dirstat-by-file mode, we don't really need to
1916 * look at the actual file contents at all.
1917 * The fact that the SHA1 changed is enough for us to
1918 * add this file to the list of results
1919 * (with each file contributing equal damage).
1920 */
1921 damage = 1;
1922 goto found_damage;
1923 }
1924
1925 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1926 diff_populate_filespec(p->one, 0);
1927 diff_populate_filespec(p->two, 0);
1928 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1929 &copied, &added);
1930 diff_free_filespec_data(p->one);
1931 diff_free_filespec_data(p->two);
1932 } else if (DIFF_FILE_VALID(p->one)) {
1933 diff_populate_filespec(p->one, 1);
1934 copied = added = 0;
1935 diff_free_filespec_data(p->one);
1936 } else if (DIFF_FILE_VALID(p->two)) {
1937 diff_populate_filespec(p->two, 1);
1938 copied = 0;
1939 added = p->two->size;
1940 diff_free_filespec_data(p->two);
1941 } else
1942 continue;
1943
1944 /*
1945 * Original minus copied is the removed material,
1946 * added is the new material. They are both damages
1947 * made to the preimage.
1948 * If the resulting damage is zero, we know that
1949 * diffcore_count_changes() considers the two entries to
1950 * be identical, but since content_changed is true, we
1951 * know that there must have been _some_ kind of change,
1952 * so we force all entries to have damage > 0.
1953 */
1954 damage = (p->one->size - copied) + added;
1955 if (!damage)
1956 damage = 1;
1957
1958 found_damage:
1959 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1960 dir.files[dir.nr].name = name;
1961 dir.files[dir.nr].changed = damage;
1962 changed += damage;
1963 dir.nr++;
1964 }
1965
1966 /* This can happen even with many files, if everything was renames */
1967 if (!changed)
1968 return;
1969
1970 /* Show all directories with more than x% of the changes */
1971 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1972 gather_dirstat(options, &dir, changed, "", 0);
1973 }
1974
1975 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1976 {
1977 int i;
1978 unsigned long changed;
1979 struct dirstat_dir dir;
1980
1981 if (data->nr == 0)
1982 return;
1983
1984 dir.files = NULL;
1985 dir.alloc = 0;
1986 dir.nr = 0;
1987 dir.permille = options->dirstat_permille;
1988 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1989
1990 changed = 0;
1991 for (i = 0; i < data->nr; i++) {
1992 struct diffstat_file *file = data->files[i];
1993 unsigned long damage = file->added + file->deleted;
1994 if (file->is_binary)
1995 /*
1996 * binary files counts bytes, not lines. Must find some
1997 * way to normalize binary bytes vs. textual lines.
1998 * The following heuristic assumes that there are 64
1999 * bytes per "line".
2000 * This is stupid and ugly, but very cheap...
2001 */
2002 damage = (damage + 63) / 64;
2003 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2004 dir.files[dir.nr].name = file->name;
2005 dir.files[dir.nr].changed = damage;
2006 changed += damage;
2007 dir.nr++;
2008 }
2009
2010 /* This can happen even with many files, if everything was renames */
2011 if (!changed)
2012 return;
2013
2014 /* Show all directories with more than x% of the changes */
2015 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2016 gather_dirstat(options, &dir, changed, "", 0);
2017 }
2018
2019 static void free_diffstat_info(struct diffstat_t *diffstat)
2020 {
2021 int i;
2022 for (i = 0; i < diffstat->nr; i++) {
2023 struct diffstat_file *f = diffstat->files[i];
2024 if (f->name != f->print_name)
2025 free(f->print_name);
2026 free(f->name);
2027 free(f->from_name);
2028 free(f);
2029 }
2030 free(diffstat->files);
2031 }
2032
2033 struct checkdiff_t {
2034 const char *filename;
2035 int lineno;
2036 int conflict_marker_size;
2037 struct diff_options *o;
2038 unsigned ws_rule;
2039 unsigned status;
2040 };
2041
2042 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2043 {
2044 char firstchar;
2045 int cnt;
2046
2047 if (len < marker_size + 1)
2048 return 0;
2049 firstchar = line[0];
2050 switch (firstchar) {
2051 case '=': case '>': case '<': case '|':
2052 break;
2053 default:
2054 return 0;
2055 }
2056 for (cnt = 1; cnt < marker_size; cnt++)
2057 if (line[cnt] != firstchar)
2058 return 0;
2059 /* line[1] thru line[marker_size-1] are same as firstchar */
2060 if (len < marker_size + 1 || !isspace(line[marker_size]))
2061 return 0;
2062 return 1;
2063 }
2064
2065 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2066 {
2067 struct checkdiff_t *data = priv;
2068 int marker_size = data->conflict_marker_size;
2069 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2070 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2071 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2072 char *err;
2073 char *line_prefix = "";
2074 struct strbuf *msgbuf;
2075
2076 assert(data->o);
2077 if (data->o->output_prefix) {
2078 msgbuf = data->o->output_prefix(data->o,
2079 data->o->output_prefix_data);
2080 line_prefix = msgbuf->buf;
2081 }
2082
2083 if (line[0] == '+') {
2084 unsigned bad;
2085 data->lineno++;
2086 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2087 data->status |= 1;
2088 fprintf(data->o->file,
2089 "%s%s:%d: leftover conflict marker\n",
2090 line_prefix, data->filename, data->lineno);
2091 }
2092 bad = ws_check(line + 1, len - 1, data->ws_rule);
2093 if (!bad)
2094 return;
2095 data->status |= bad;
2096 err = whitespace_error_string(bad);
2097 fprintf(data->o->file, "%s%s:%d: %s.\n",
2098 line_prefix, data->filename, data->lineno, err);
2099 free(err);
2100 emit_line(data->o, set, reset, line, 1);
2101 ws_check_emit(line + 1, len - 1, data->ws_rule,
2102 data->o->file, set, reset, ws);
2103 } else if (line[0] == ' ') {
2104 data->lineno++;
2105 } else if (line[0] == '@') {
2106 char *plus = strchr(line, '+');
2107 if (plus)
2108 data->lineno = strtol(plus, NULL, 10) - 1;
2109 else
2110 die("invalid diff");
2111 }
2112 }
2113
2114 static unsigned char *deflate_it(char *data,
2115 unsigned long size,
2116 unsigned long *result_size)
2117 {
2118 int bound;
2119 unsigned char *deflated;
2120 git_zstream stream;
2121
2122 memset(&stream, 0, sizeof(stream));
2123 git_deflate_init(&stream, zlib_compression_level);
2124 bound = git_deflate_bound(&stream, size);
2125 deflated = xmalloc(bound);
2126 stream.next_out = deflated;
2127 stream.avail_out = bound;
2128
2129 stream.next_in = (unsigned char *)data;
2130 stream.avail_in = size;
2131 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2132 ; /* nothing */
2133 git_deflate_end(&stream);
2134 *result_size = stream.total_out;
2135 return deflated;
2136 }
2137
2138 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2139 {
2140 void *cp;
2141 void *delta;
2142 void *deflated;
2143 void *data;
2144 unsigned long orig_size;
2145 unsigned long delta_size;
2146 unsigned long deflate_size;
2147 unsigned long data_size;
2148
2149 /* We could do deflated delta, or we could do just deflated two,
2150 * whichever is smaller.
2151 */
2152 delta = NULL;
2153 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2154 if (one->size && two->size) {
2155 delta = diff_delta(one->ptr, one->size,
2156 two->ptr, two->size,
2157 &delta_size, deflate_size);
2158 if (delta) {
2159 void *to_free = delta;
2160 orig_size = delta_size;
2161 delta = deflate_it(delta, delta_size, &delta_size);
2162 free(to_free);
2163 }
2164 }
2165
2166 if (delta && delta_size < deflate_size) {
2167 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2168 free(deflated);
2169 data = delta;
2170 data_size = delta_size;
2171 }
2172 else {
2173 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2174 free(delta);
2175 data = deflated;
2176 data_size = deflate_size;
2177 }
2178
2179 /* emit data encoded in base85 */
2180 cp = data;
2181 while (data_size) {
2182 int bytes = (52 < data_size) ? 52 : data_size;
2183 char line[70];
2184 data_size -= bytes;
2185 if (bytes <= 26)
2186 line[0] = bytes + 'A' - 1;
2187 else
2188 line[0] = bytes - 26 + 'a' - 1;
2189 encode_85(line + 1, cp, bytes);
2190 cp = (char *) cp + bytes;
2191 fprintf(file, "%s", prefix);
2192 fputs(line, file);
2193 fputc('\n', file);
2194 }
2195 fprintf(file, "%s\n", prefix);
2196 free(data);
2197 }
2198
2199 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2200 {
2201 fprintf(file, "%sGIT binary patch\n", prefix);
2202 emit_binary_diff_body(file, one, two, prefix);
2203 emit_binary_diff_body(file, two, one, prefix);
2204 }
2205
2206 int diff_filespec_is_binary(struct diff_filespec *one)
2207 {
2208 if (one->is_binary == -1) {
2209 diff_filespec_load_driver(one);
2210 if (one->driver->binary != -1)
2211 one->is_binary = one->driver->binary;
2212 else {
2213 if (!one->data && DIFF_FILE_VALID(one))
2214 diff_populate_filespec(one, 0);
2215 if (one->data)
2216 one->is_binary = buffer_is_binary(one->data,
2217 one->size);
2218 if (one->is_binary == -1)
2219 one->is_binary = 0;
2220 }
2221 }
2222 return one->is_binary;
2223 }
2224
2225 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2226 {
2227 diff_filespec_load_driver(one);
2228 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2229 }
2230
2231 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2232 {
2233 if (!options->a_prefix)
2234 options->a_prefix = a;
2235 if (!options->b_prefix)
2236 options->b_prefix = b;
2237 }
2238
2239 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2240 {
2241 if (!DIFF_FILE_VALID(one))
2242 return NULL;
2243
2244 diff_filespec_load_driver(one);
2245 return userdiff_get_textconv(one->driver);
2246 }
2247
2248 static void builtin_diff(const char *name_a,
2249 const char *name_b,
2250 struct diff_filespec *one,
2251 struct diff_filespec *two,
2252 const char *xfrm_msg,
2253 int must_show_header,
2254 struct diff_options *o,
2255 int complete_rewrite)
2256 {
2257 mmfile_t mf1, mf2;
2258 const char *lbl[2];
2259 char *a_one, *b_two;
2260 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2261 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2262 const char *a_prefix, *b_prefix;
2263 struct userdiff_driver *textconv_one = NULL;
2264 struct userdiff_driver *textconv_two = NULL;
2265 struct strbuf header = STRBUF_INIT;
2266 struct strbuf *msgbuf;
2267 char *line_prefix = "";
2268
2269 if (o->output_prefix) {
2270 msgbuf = o->output_prefix(o, o->output_prefix_data);
2271 line_prefix = msgbuf->buf;
2272 }
2273
2274 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2275 (!one->mode || S_ISGITLINK(one->mode)) &&
2276 (!two->mode || S_ISGITLINK(two->mode))) {
2277 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2278 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2279 show_submodule_summary(o->file, one ? one->path : two->path,
2280 one->sha1, two->sha1, two->dirty_submodule,
2281 meta, del, add, reset);
2282 return;
2283 }
2284
2285 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2286 textconv_one = get_textconv(one);
2287 textconv_two = get_textconv(two);
2288 }
2289
2290 diff_set_mnemonic_prefix(o, "a/", "b/");
2291 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2292 a_prefix = o->b_prefix;
2293 b_prefix = o->a_prefix;
2294 } else {
2295 a_prefix = o->a_prefix;
2296 b_prefix = o->b_prefix;
2297 }
2298
2299 /* Never use a non-valid filename anywhere if at all possible */
2300 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2301 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2302
2303 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2304 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2305 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2306 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2307 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2308 if (lbl[0][0] == '/') {
2309 /* /dev/null */
2310 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2311 if (xfrm_msg)
2312 strbuf_addstr(&header, xfrm_msg);
2313 must_show_header = 1;
2314 }
2315 else if (lbl[1][0] == '/') {
2316 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2317 if (xfrm_msg)
2318 strbuf_addstr(&header, xfrm_msg);
2319 must_show_header = 1;
2320 }
2321 else {
2322 if (one->mode != two->mode) {
2323 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2324 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2325 must_show_header = 1;
2326 }
2327 if (xfrm_msg)
2328 strbuf_addstr(&header, xfrm_msg);
2329
2330 /*
2331 * we do not run diff between different kind
2332 * of objects.
2333 */
2334 if ((one->mode ^ two->mode) & S_IFMT)
2335 goto free_ab_and_return;
2336 if (complete_rewrite &&
2337 (textconv_one || !diff_filespec_is_binary(one)) &&
2338 (textconv_two || !diff_filespec_is_binary(two))) {
2339 fprintf(o->file, "%s", header.buf);
2340 strbuf_reset(&header);
2341 emit_rewrite_diff(name_a, name_b, one, two,
2342 textconv_one, textconv_two, o);
2343 o->found_changes = 1;
2344 goto free_ab_and_return;
2345 }
2346 }
2347
2348 if (o->irreversible_delete && lbl[1][0] == '/') {
2349 fprintf(o->file, "%s", header.buf);
2350 strbuf_reset(&header);
2351 goto free_ab_and_return;
2352 } else if (!DIFF_OPT_TST(o, TEXT) &&
2353 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2354 (!textconv_two && diff_filespec_is_binary(two)) )) {
2355 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2356 die("unable to read files to diff");
2357 /* Quite common confusing case */
2358 if (mf1.size == mf2.size &&
2359 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2360 if (must_show_header)
2361 fprintf(o->file, "%s", header.buf);
2362 goto free_ab_and_return;
2363 }
2364 fprintf(o->file, "%s", header.buf);
2365 strbuf_reset(&header);
2366 if (DIFF_OPT_TST(o, BINARY))
2367 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2368 else
2369 fprintf(o->file, "%sBinary files %s and %s differ\n",
2370 line_prefix, lbl[0], lbl[1]);
2371 o->found_changes = 1;
2372 } else {
2373 /* Crazy xdl interfaces.. */
2374 const char *diffopts = getenv("GIT_DIFF_OPTS");
2375 xpparam_t xpp;
2376 xdemitconf_t xecfg;
2377 struct emit_callback ecbdata;
2378 const struct userdiff_funcname *pe;
2379
2380 if (must_show_header) {
2381 fprintf(o->file, "%s", header.buf);
2382 strbuf_reset(&header);
2383 }
2384
2385 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2386 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2387
2388 pe = diff_funcname_pattern(one);
2389 if (!pe)
2390 pe = diff_funcname_pattern(two);
2391
2392 memset(&xpp, 0, sizeof(xpp));
2393 memset(&xecfg, 0, sizeof(xecfg));
2394 memset(&ecbdata, 0, sizeof(ecbdata));
2395 ecbdata.label_path = lbl;
2396 ecbdata.color_diff = want_color(o->use_color);
2397 ecbdata.found_changesp = &o->found_changes;
2398 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2399 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2400 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2401 ecbdata.opt = o;
2402 ecbdata.header = header.len ? &header : NULL;
2403 xpp.flags = o->xdl_opts;
2404 xecfg.ctxlen = o->context;
2405 xecfg.interhunkctxlen = o->interhunkcontext;
2406 xecfg.flags = XDL_EMIT_FUNCNAMES;
2407 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2408 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2409 if (pe)
2410 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2411 if (!diffopts)
2412 ;
2413 else if (!prefixcmp(diffopts, "--unified="))
2414 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2415 else if (!prefixcmp(diffopts, "-u"))
2416 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2417 if (o->word_diff)
2418 init_diff_words_data(&ecbdata, o, one, two);
2419 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2420 &xpp, &xecfg);
2421 if (o->word_diff)
2422 free_diff_words_data(&ecbdata);
2423 if (textconv_one)
2424 free(mf1.ptr);
2425 if (textconv_two)
2426 free(mf2.ptr);
2427 xdiff_clear_find_func(&xecfg);
2428 }
2429
2430 free_ab_and_return:
2431 strbuf_release(&header);
2432 diff_free_filespec_data(one);
2433 diff_free_filespec_data(two);
2434 free(a_one);
2435 free(b_two);
2436 return;
2437 }
2438
2439 static void builtin_diffstat(const char *name_a, const char *name_b,
2440 struct diff_filespec *one,
2441 struct diff_filespec *two,
2442 struct diffstat_t *diffstat,
2443 struct diff_options *o,
2444 struct diff_filepair *p)
2445 {
2446 mmfile_t mf1, mf2;
2447 struct diffstat_file *data;
2448 int same_contents;
2449 int complete_rewrite = 0;
2450
2451 if (!DIFF_PAIR_UNMERGED(p)) {
2452 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2453 complete_rewrite = 1;
2454 }
2455
2456 data = diffstat_add(diffstat, name_a, name_b);
2457 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2458
2459 if (!one || !two) {
2460 data->is_unmerged = 1;
2461 return;
2462 }
2463
2464 same_contents = !hashcmp(one->sha1, two->sha1);
2465
2466 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2467 data->is_binary = 1;
2468 if (same_contents) {
2469 data->added = 0;
2470 data->deleted = 0;
2471 } else {
2472 data->added = diff_filespec_size(two);
2473 data->deleted = diff_filespec_size(one);
2474 }
2475 }
2476
2477 else if (complete_rewrite) {
2478 diff_populate_filespec(one, 0);
2479 diff_populate_filespec(two, 0);
2480 data->deleted = count_lines(one->data, one->size);
2481 data->added = count_lines(two->data, two->size);
2482 }
2483
2484 else if (!same_contents) {
2485 /* Crazy xdl interfaces.. */
2486 xpparam_t xpp;
2487 xdemitconf_t xecfg;
2488
2489 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2490 die("unable to read files to diff");
2491
2492 memset(&xpp, 0, sizeof(xpp));
2493 memset(&xecfg, 0, sizeof(xecfg));
2494 xpp.flags = o->xdl_opts;
2495 xecfg.ctxlen = o->context;
2496 xecfg.interhunkctxlen = o->interhunkcontext;
2497 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2498 &xpp, &xecfg);
2499 }
2500
2501 diff_free_filespec_data(one);
2502 diff_free_filespec_data(two);
2503 }
2504
2505 static void builtin_checkdiff(const char *name_a, const char *name_b,
2506 const char *attr_path,
2507 struct diff_filespec *one,
2508 struct diff_filespec *two,
2509 struct diff_options *o)
2510 {
2511 mmfile_t mf1, mf2;
2512 struct checkdiff_t data;
2513
2514 if (!two)
2515 return;
2516
2517 memset(&data, 0, sizeof(data));
2518 data.filename = name_b ? name_b : name_a;
2519 data.lineno = 0;
2520 data.o = o;
2521 data.ws_rule = whitespace_rule(attr_path);
2522 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2523
2524 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2525 die("unable to read files to diff");
2526
2527 /*
2528 * All the other codepaths check both sides, but not checking
2529 * the "old" side here is deliberate. We are checking the newly
2530 * introduced changes, and as long as the "new" side is text, we
2531 * can and should check what it introduces.
2532 */
2533 if (diff_filespec_is_binary(two))
2534 goto free_and_return;
2535 else {
2536 /* Crazy xdl interfaces.. */
2537 xpparam_t xpp;
2538 xdemitconf_t xecfg;
2539
2540 memset(&xpp, 0, sizeof(xpp));
2541 memset(&xecfg, 0, sizeof(xecfg));
2542 xecfg.ctxlen = 1; /* at least one context line */
2543 xpp.flags = 0;
2544 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2545 &xpp, &xecfg);
2546
2547 if (data.ws_rule & WS_BLANK_AT_EOF) {
2548 struct emit_callback ecbdata;
2549 int blank_at_eof;
2550
2551 ecbdata.ws_rule = data.ws_rule;
2552 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2553 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2554
2555 if (blank_at_eof) {
2556 static char *err;
2557 if (!err)
2558 err = whitespace_error_string(WS_BLANK_AT_EOF);
2559 fprintf(o->file, "%s:%d: %s.\n",
2560 data.filename, blank_at_eof, err);
2561 data.status = 1; /* report errors */
2562 }
2563 }
2564 }
2565 free_and_return:
2566 diff_free_filespec_data(one);
2567 diff_free_filespec_data(two);
2568 if (data.status)
2569 DIFF_OPT_SET(o, CHECK_FAILED);
2570 }
2571
2572 struct diff_filespec *alloc_filespec(const char *path)
2573 {
2574 int namelen = strlen(path);
2575 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2576
2577 memset(spec, 0, sizeof(*spec));
2578 spec->path = (char *)(spec + 1);
2579 memcpy(spec->path, path, namelen+1);
2580 spec->count = 1;
2581 spec->is_binary = -1;
2582 return spec;
2583 }
2584
2585 void free_filespec(struct diff_filespec *spec)
2586 {
2587 if (!--spec->count) {
2588 diff_free_filespec_data(spec);
2589 free(spec);
2590 }
2591 }
2592
2593 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2594 int sha1_valid, unsigned short mode)
2595 {
2596 if (mode) {
2597 spec->mode = canon_mode(mode);
2598 hashcpy(spec->sha1, sha1);
2599 spec->sha1_valid = sha1_valid;
2600 }
2601 }
2602
2603 /*
2604 * Given a name and sha1 pair, if the index tells us the file in
2605 * the work tree has that object contents, return true, so that
2606 * prepare_temp_file() does not have to inflate and extract.
2607 */
2608 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2609 {
2610 struct cache_entry *ce;
2611 struct stat st;
2612 int pos, len;
2613
2614 /*
2615 * We do not read the cache ourselves here, because the
2616 * benchmark with my previous version that always reads cache
2617 * shows that it makes things worse for diff-tree comparing
2618 * two linux-2.6 kernel trees in an already checked out work
2619 * tree. This is because most diff-tree comparisons deal with
2620 * only a small number of files, while reading the cache is
2621 * expensive for a large project, and its cost outweighs the
2622 * savings we get by not inflating the object to a temporary
2623 * file. Practically, this code only helps when we are used
2624 * by diff-cache --cached, which does read the cache before
2625 * calling us.
2626 */
2627 if (!active_cache)
2628 return 0;
2629
2630 /* We want to avoid the working directory if our caller
2631 * doesn't need the data in a normal file, this system
2632 * is rather slow with its stat/open/mmap/close syscalls,
2633 * and the object is contained in a pack file. The pack
2634 * is probably already open and will be faster to obtain
2635 * the data through than the working directory. Loose
2636 * objects however would tend to be slower as they need
2637 * to be individually opened and inflated.
2638 */
2639 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2640 return 0;
2641
2642 len = strlen(name);
2643 pos = cache_name_pos(name, len);
2644 if (pos < 0)
2645 return 0;
2646 ce = active_cache[pos];
2647
2648 /*
2649 * This is not the sha1 we are looking for, or
2650 * unreusable because it is not a regular file.
2651 */
2652 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2653 return 0;
2654
2655 /*
2656 * If ce is marked as "assume unchanged", there is no
2657 * guarantee that work tree matches what we are looking for.
2658 */
2659 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2660 return 0;
2661
2662 /*
2663 * If ce matches the file in the work tree, we can reuse it.
2664 */
2665 if (ce_uptodate(ce) ||
2666 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2667 return 1;
2668
2669 return 0;
2670 }
2671
2672 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2673 {
2674 int len;
2675 char *data = xmalloc(100), *dirty = "";
2676
2677 /* Are we looking at the work tree? */
2678 if (s->dirty_submodule)
2679 dirty = "-dirty";
2680
2681 len = snprintf(data, 100,
2682 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2683 s->data = data;
2684 s->size = len;
2685 s->should_free = 1;
2686 if (size_only) {
2687 s->data = NULL;
2688 free(data);
2689 }
2690 return 0;
2691 }
2692
2693 /*
2694 * While doing rename detection and pickaxe operation, we may need to
2695 * grab the data for the blob (or file) for our own in-core comparison.
2696 * diff_filespec has data and size fields for this purpose.
2697 */
2698 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2699 {
2700 int err = 0;
2701 if (!DIFF_FILE_VALID(s))
2702 die("internal error: asking to populate invalid file.");
2703 if (S_ISDIR(s->mode))
2704 return -1;
2705
2706 if (s->data)
2707 return 0;
2708
2709 if (size_only && 0 < s->size)
2710 return 0;
2711
2712 if (S_ISGITLINK(s->mode))
2713 return diff_populate_gitlink(s, size_only);
2714
2715 if (!s->sha1_valid ||
2716 reuse_worktree_file(s->path, s->sha1, 0)) {
2717 struct strbuf buf = STRBUF_INIT;
2718 struct stat st;
2719 int fd;
2720
2721 if (lstat(s->path, &st) < 0) {
2722 if (errno == ENOENT) {
2723 err_empty:
2724 err = -1;
2725 empty:
2726 s->data = (char *)"";
2727 s->size = 0;
2728 return err;
2729 }
2730 }
2731 s->size = xsize_t(st.st_size);
2732 if (!s->size)
2733 goto empty;
2734 if (S_ISLNK(st.st_mode)) {
2735 struct strbuf sb = STRBUF_INIT;
2736
2737 if (strbuf_readlink(&sb, s->path, s->size))
2738 goto err_empty;
2739 s->size = sb.len;
2740 s->data = strbuf_detach(&sb, NULL);
2741 s->should_free = 1;
2742 return 0;
2743 }
2744 if (size_only)
2745 return 0;
2746 fd = open(s->path, O_RDONLY);
2747 if (fd < 0)
2748 goto err_empty;
2749 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2750 close(fd);
2751 s->should_munmap = 1;
2752
2753 /*
2754 * Convert from working tree format to canonical git format
2755 */
2756 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2757 size_t size = 0;
2758 munmap(s->data, s->size);
2759 s->should_munmap = 0;
2760 s->data = strbuf_detach(&buf, &size);
2761 s->size = size;
2762 s->should_free = 1;
2763 }
2764 }
2765 else {
2766 enum object_type type;
2767 if (size_only) {
2768 type = sha1_object_info(s->sha1, &s->size);
2769 if (type < 0)
2770 die("unable to read %s", sha1_to_hex(s->sha1));
2771 } else {
2772 s->data = read_sha1_file(s->sha1, &type, &s->size);
2773 if (!s->data)
2774 die("unable to read %s", sha1_to_hex(s->sha1));
2775 s->should_free = 1;
2776 }
2777 }
2778 return 0;
2779 }
2780
2781 void diff_free_filespec_blob(struct diff_filespec *s)
2782 {
2783 if (s->should_free)
2784 free(s->data);
2785 else if (s->should_munmap)
2786 munmap(s->data, s->size);
2787
2788 if (s->should_free || s->should_munmap) {
2789 s->should_free = s->should_munmap = 0;
2790 s->data = NULL;
2791 }
2792 }
2793
2794 void diff_free_filespec_data(struct diff_filespec *s)
2795 {
2796 diff_free_filespec_blob(s);
2797 free(s->cnt_data);
2798 s->cnt_data = NULL;
2799 }
2800
2801 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2802 void *blob,
2803 unsigned long size,
2804 const unsigned char *sha1,
2805 int mode)
2806 {
2807 int fd;
2808 struct strbuf buf = STRBUF_INIT;
2809 struct strbuf template = STRBUF_INIT;
2810 char *path_dup = xstrdup(path);
2811 const char *base = basename(path_dup);
2812
2813 /* Generate "XXXXXX_basename.ext" */
2814 strbuf_addstr(&template, "XXXXXX_");
2815 strbuf_addstr(&template, base);
2816
2817 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2818 strlen(base) + 1);
2819 if (fd < 0)
2820 die_errno("unable to create temp-file");
2821 if (convert_to_working_tree(path,
2822 (const char *)blob, (size_t)size, &buf)) {
2823 blob = buf.buf;
2824 size = buf.len;
2825 }
2826 if (write_in_full(fd, blob, size) != size)
2827 die_errno("unable to write temp-file");
2828 close(fd);
2829 temp->name = temp->tmp_path;
2830 strcpy(temp->hex, sha1_to_hex(sha1));
2831 temp->hex[40] = 0;
2832 sprintf(temp->mode, "%06o", mode);
2833 strbuf_release(&buf);
2834 strbuf_release(&template);
2835 free(path_dup);
2836 }
2837
2838 static struct diff_tempfile *prepare_temp_file(const char *name,
2839 struct diff_filespec *one)
2840 {
2841 struct diff_tempfile *temp = claim_diff_tempfile();
2842
2843 if (!DIFF_FILE_VALID(one)) {
2844 not_a_valid_file:
2845 /* A '-' entry produces this for file-2, and
2846 * a '+' entry produces this for file-1.
2847 */
2848 temp->name = "/dev/null";
2849 strcpy(temp->hex, ".");
2850 strcpy(temp->mode, ".");
2851 return temp;
2852 }
2853
2854 if (!remove_tempfile_installed) {
2855 atexit(remove_tempfile);
2856 sigchain_push_common(remove_tempfile_on_signal);
2857 remove_tempfile_installed = 1;
2858 }
2859
2860 if (!one->sha1_valid ||
2861 reuse_worktree_file(name, one->sha1, 1)) {
2862 struct stat st;
2863 if (lstat(name, &st) < 0) {
2864 if (errno == ENOENT)
2865 goto not_a_valid_file;
2866 die_errno("stat(%s)", name);
2867 }
2868 if (S_ISLNK(st.st_mode)) {
2869 struct strbuf sb = STRBUF_INIT;
2870 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2871 die_errno("readlink(%s)", name);
2872 prep_temp_blob(name, temp, sb.buf, sb.len,
2873 (one->sha1_valid ?
2874 one->sha1 : null_sha1),
2875 (one->sha1_valid ?
2876 one->mode : S_IFLNK));
2877 strbuf_release(&sb);
2878 }
2879 else {
2880 /* we can borrow from the file in the work tree */
2881 temp->name = name;
2882 if (!one->sha1_valid)
2883 strcpy(temp->hex, sha1_to_hex(null_sha1));
2884 else
2885 strcpy(temp->hex, sha1_to_hex(one->sha1));
2886 /* Even though we may sometimes borrow the
2887 * contents from the work tree, we always want
2888 * one->mode. mode is trustworthy even when
2889 * !(one->sha1_valid), as long as
2890 * DIFF_FILE_VALID(one).
2891 */
2892 sprintf(temp->mode, "%06o", one->mode);
2893 }
2894 return temp;
2895 }
2896 else {
2897 if (diff_populate_filespec(one, 0))
2898 die("cannot read data blob for %s", one->path);
2899 prep_temp_blob(name, temp, one->data, one->size,
2900 one->sha1, one->mode);
2901 }
2902 return temp;
2903 }
2904
2905 /* An external diff command takes:
2906 *
2907 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2908 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2909 *
2910 */
2911 static void run_external_diff(const char *pgm,
2912 const char *name,
2913 const char *other,
2914 struct diff_filespec *one,
2915 struct diff_filespec *two,
2916 const char *xfrm_msg,
2917 int complete_rewrite)
2918 {
2919 const char *spawn_arg[10];
2920 int retval;
2921 const char **arg = &spawn_arg[0];
2922
2923 if (one && two) {
2924 struct diff_tempfile *temp_one, *temp_two;
2925 const char *othername = (other ? other : name);
2926 temp_one = prepare_temp_file(name, one);
2927 temp_two = prepare_temp_file(othername, two);
2928 *arg++ = pgm;
2929 *arg++ = name;
2930 *arg++ = temp_one->name;
2931 *arg++ = temp_one->hex;
2932 *arg++ = temp_one->mode;
2933 *arg++ = temp_two->name;
2934 *arg++ = temp_two->hex;
2935 *arg++ = temp_two->mode;
2936 if (other) {
2937 *arg++ = other;
2938 *arg++ = xfrm_msg;
2939 }
2940 } else {
2941 *arg++ = pgm;
2942 *arg++ = name;
2943 }
2944 *arg = NULL;
2945 fflush(NULL);
2946 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2947 remove_tempfile();
2948 if (retval) {
2949 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2950 exit(1);
2951 }
2952 }
2953
2954 static int similarity_index(struct diff_filepair *p)
2955 {
2956 return p->score * 100 / MAX_SCORE;
2957 }
2958
2959 static void fill_metainfo(struct strbuf *msg,
2960 const char *name,
2961 const char *other,
2962 struct diff_filespec *one,
2963 struct diff_filespec *two,
2964 struct diff_options *o,
2965 struct diff_filepair *p,
2966 int *must_show_header,
2967 int use_color)
2968 {
2969 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2970 const char *reset = diff_get_color(use_color, DIFF_RESET);
2971 struct strbuf *msgbuf;
2972 char *line_prefix = "";
2973
2974 *must_show_header = 1;
2975 if (o->output_prefix) {
2976 msgbuf = o->output_prefix(o, o->output_prefix_data);
2977 line_prefix = msgbuf->buf;
2978 }
2979 strbuf_init(msg, PATH_MAX * 2 + 300);
2980 switch (p->status) {
2981 case DIFF_STATUS_COPIED:
2982 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2983 line_prefix, set, similarity_index(p));
2984 strbuf_addf(msg, "%s\n%s%scopy from ",
2985 reset, line_prefix, set);
2986 quote_c_style(name, msg, NULL, 0);
2987 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2988 quote_c_style(other, msg, NULL, 0);
2989 strbuf_addf(msg, "%s\n", reset);
2990 break;
2991 case DIFF_STATUS_RENAMED:
2992 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2993 line_prefix, set, similarity_index(p));
2994 strbuf_addf(msg, "%s\n%s%srename from ",
2995 reset, line_prefix, set);
2996 quote_c_style(name, msg, NULL, 0);
2997 strbuf_addf(msg, "%s\n%s%srename to ",
2998 reset, line_prefix, set);
2999 quote_c_style(other, msg, NULL, 0);
3000 strbuf_addf(msg, "%s\n", reset);
3001 break;
3002 case DIFF_STATUS_MODIFIED:
3003 if (p->score) {
3004 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3005 line_prefix,
3006 set, similarity_index(p), reset);
3007 break;
3008 }
3009 /* fallthru */
3010 default:
3011 *must_show_header = 0;
3012 }
3013 if (one && two && hashcmp(one->sha1, two->sha1)) {
3014 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3015
3016 if (DIFF_OPT_TST(o, BINARY)) {
3017 mmfile_t mf;
3018 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3019 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3020 abbrev = 40;
3021 }
3022 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3023 find_unique_abbrev(one->sha1, abbrev));
3024 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3025 if (one->mode == two->mode)
3026 strbuf_addf(msg, " %06o", one->mode);
3027 strbuf_addf(msg, "%s\n", reset);
3028 }
3029 }
3030
3031 static void run_diff_cmd(const char *pgm,
3032 const char *name,
3033 const char *other,
3034 const char *attr_path,
3035 struct diff_filespec *one,
3036 struct diff_filespec *two,
3037 struct strbuf *msg,
3038 struct diff_options *o,
3039 struct diff_filepair *p)
3040 {
3041 const char *xfrm_msg = NULL;
3042 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3043 int must_show_header = 0;
3044
3045
3046 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3047 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3048 if (drv && drv->external)
3049 pgm = drv->external;
3050 }
3051
3052 if (msg) {
3053 /*
3054 * don't use colors when the header is intended for an
3055 * external diff driver
3056 */
3057 fill_metainfo(msg, name, other, one, two, o, p,
3058 &must_show_header,
3059 want_color(o->use_color) && !pgm);
3060 xfrm_msg = msg->len ? msg->buf : NULL;
3061 }
3062
3063 if (pgm) {
3064 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3065 complete_rewrite);
3066 return;
3067 }
3068 if (one && two)
3069 builtin_diff(name, other ? other : name,
3070 one, two, xfrm_msg, must_show_header,
3071 o, complete_rewrite);
3072 else
3073 fprintf(o->file, "* Unmerged path %s\n", name);
3074 }
3075
3076 static void diff_fill_sha1_info(struct diff_filespec *one)
3077 {
3078 if (DIFF_FILE_VALID(one)) {
3079 if (!one->sha1_valid) {
3080 struct stat st;
3081 if (one->is_stdin) {
3082 hashcpy(one->sha1, null_sha1);
3083 return;
3084 }
3085 if (lstat(one->path, &st) < 0)
3086 die_errno("stat '%s'", one->path);
3087 if (index_path(one->sha1, one->path, &st, 0))
3088 die("cannot hash %s", one->path);
3089 }
3090 }
3091 else
3092 hashclr(one->sha1);
3093 }
3094
3095 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3096 {
3097 /* Strip the prefix but do not molest /dev/null and absolute paths */
3098 if (*namep && **namep != '/') {
3099 *namep += prefix_length;
3100 if (**namep == '/')
3101 ++*namep;
3102 }
3103 if (*otherp && **otherp != '/') {
3104 *otherp += prefix_length;
3105 if (**otherp == '/')
3106 ++*otherp;
3107 }
3108 }
3109
3110 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3111 {
3112 const char *pgm = external_diff();
3113 struct strbuf msg;
3114 struct diff_filespec *one = p->one;
3115 struct diff_filespec *two = p->two;
3116 const char *name;
3117 const char *other;
3118 const char *attr_path;
3119
3120 name = p->one->path;
3121 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3122 attr_path = name;
3123 if (o->prefix_length)
3124 strip_prefix(o->prefix_length, &name, &other);
3125
3126 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3127 pgm = NULL;
3128
3129 if (DIFF_PAIR_UNMERGED(p)) {
3130 run_diff_cmd(pgm, name, NULL, attr_path,
3131 NULL, NULL, NULL, o, p);
3132 return;
3133 }
3134
3135 diff_fill_sha1_info(one);
3136 diff_fill_sha1_info(two);
3137
3138 if (!pgm &&
3139 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3140 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3141 /*
3142 * a filepair that changes between file and symlink
3143 * needs to be split into deletion and creation.
3144 */
3145 struct diff_filespec *null = alloc_filespec(two->path);
3146 run_diff_cmd(NULL, name, other, attr_path,
3147 one, null, &msg, o, p);
3148 free(null);
3149 strbuf_release(&msg);
3150
3151 null = alloc_filespec(one->path);
3152 run_diff_cmd(NULL, name, other, attr_path,
3153 null, two, &msg, o, p);
3154 free(null);
3155 }
3156 else
3157 run_diff_cmd(pgm, name, other, attr_path,
3158 one, two, &msg, o, p);
3159
3160 strbuf_release(&msg);
3161 }
3162
3163 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3164 struct diffstat_t *diffstat)
3165 {
3166 const char *name;
3167 const char *other;
3168
3169 if (DIFF_PAIR_UNMERGED(p)) {
3170 /* unmerged */
3171 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3172 return;
3173 }
3174
3175 name = p->one->path;
3176 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3177
3178 if (o->prefix_length)
3179 strip_prefix(o->prefix_length, &name, &other);
3180
3181 diff_fill_sha1_info(p->one);
3182 diff_fill_sha1_info(p->two);
3183
3184 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3185 }
3186
3187 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3188 {
3189 const char *name;
3190 const char *other;
3191 const char *attr_path;
3192
3193 if (DIFF_PAIR_UNMERGED(p)) {
3194 /* unmerged */
3195 return;
3196 }
3197
3198 name = p->one->path;
3199 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3200 attr_path = other ? other : name;
3201
3202 if (o->prefix_length)
3203 strip_prefix(o->prefix_length, &name, &other);
3204
3205 diff_fill_sha1_info(p->one);
3206 diff_fill_sha1_info(p->two);
3207
3208 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3209 }
3210
3211 void diff_setup(struct diff_options *options)
3212 {
3213 memcpy(options, &default_diff_options, sizeof(*options));
3214
3215 options->file = stdout;
3216
3217 options->line_termination = '\n';
3218 options->break_opt = -1;
3219 options->rename_limit = -1;
3220 options->dirstat_permille = diff_dirstat_permille_default;
3221 options->context = diff_context_default;
3222 DIFF_OPT_SET(options, RENAME_EMPTY);
3223
3224 options->change = diff_change;
3225 options->add_remove = diff_addremove;
3226 options->use_color = diff_use_color_default;
3227 options->detect_rename = diff_detect_rename_default;
3228
3229 if (diff_no_prefix) {
3230 options->a_prefix = options->b_prefix = "";
3231 } else if (!diff_mnemonic_prefix) {
3232 options->a_prefix = "a/";
3233 options->b_prefix = "b/";
3234 }
3235 }
3236
3237 void diff_setup_done(struct diff_options *options)
3238 {
3239 int count = 0;
3240
3241 if (options->output_format & DIFF_FORMAT_NAME)
3242 count++;
3243 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3244 count++;
3245 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3246 count++;
3247 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3248 count++;
3249 if (count > 1)
3250 die("--name-only, --name-status, --check and -s are mutually exclusive");
3251
3252 /*
3253 * Most of the time we can say "there are changes"
3254 * only by checking if there are changed paths, but
3255 * --ignore-whitespace* options force us to look
3256 * inside contents.
3257 */
3258
3259 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3260 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3261 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3262 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3263 else
3264 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3265
3266 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3267 options->detect_rename = DIFF_DETECT_COPY;
3268
3269 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3270 options->prefix = NULL;
3271 if (options->prefix)
3272 options->prefix_length = strlen(options->prefix);
3273 else
3274 options->prefix_length = 0;
3275
3276 if (options->output_format & (DIFF_FORMAT_NAME |
3277 DIFF_FORMAT_NAME_STATUS |
3278 DIFF_FORMAT_CHECKDIFF |
3279 DIFF_FORMAT_NO_OUTPUT))
3280 options->output_format &= ~(DIFF_FORMAT_RAW |
3281 DIFF_FORMAT_NUMSTAT |
3282 DIFF_FORMAT_DIFFSTAT |
3283 DIFF_FORMAT_SHORTSTAT |
3284 DIFF_FORMAT_DIRSTAT |
3285 DIFF_FORMAT_SUMMARY |
3286 DIFF_FORMAT_PATCH);
3287
3288 /*
3289 * These cases always need recursive; we do not drop caller-supplied
3290 * recursive bits for other formats here.
3291 */
3292 if (options->output_format & (DIFF_FORMAT_PATCH |
3293 DIFF_FORMAT_NUMSTAT |
3294 DIFF_FORMAT_DIFFSTAT |
3295 DIFF_FORMAT_SHORTSTAT |
3296 DIFF_FORMAT_DIRSTAT |
3297 DIFF_FORMAT_SUMMARY |
3298 DIFF_FORMAT_CHECKDIFF))
3299 DIFF_OPT_SET(options, RECURSIVE);
3300 /*
3301 * Also pickaxe would not work very well if you do not say recursive
3302 */
3303 if (options->pickaxe)
3304 DIFF_OPT_SET(options, RECURSIVE);
3305 /*
3306 * When patches are generated, submodules diffed against the work tree
3307 * must be checked for dirtiness too so it can be shown in the output
3308 */
3309 if (options->output_format & DIFF_FORMAT_PATCH)
3310 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3311
3312 if (options->detect_rename && options->rename_limit < 0)
3313 options->rename_limit = diff_rename_limit_default;
3314 if (options->setup & DIFF_SETUP_USE_CACHE) {
3315 if (!active_cache)
3316 /* read-cache does not die even when it fails
3317 * so it is safe for us to do this here. Also
3318 * it does not smudge active_cache or active_nr
3319 * when it fails, so we do not have to worry about
3320 * cleaning it up ourselves either.
3321 */
3322 read_cache();
3323 }
3324 if (options->abbrev <= 0 || 40 < options->abbrev)
3325 options->abbrev = 40; /* full */
3326
3327 /*
3328 * It does not make sense to show the first hit we happened
3329 * to have found. It does not make sense not to return with
3330 * exit code in such a case either.
3331 */
3332 if (DIFF_OPT_TST(options, QUICK)) {
3333 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3334 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3335 }
3336 }
3337
3338 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3339 {
3340 char c, *eq;
3341 int len;
3342
3343 if (*arg != '-')
3344 return 0;
3345 c = *++arg;
3346 if (!c)
3347 return 0;
3348 if (c == arg_short) {
3349 c = *++arg;
3350 if (!c)
3351 return 1;
3352 if (val && isdigit(c)) {
3353 char *end;
3354 int n = strtoul(arg, &end, 10);
3355 if (*end)
3356 return 0;
3357 *val = n;
3358 return 1;
3359 }
3360 return 0;
3361 }
3362 if (c != '-')
3363 return 0;
3364 arg++;
3365 eq = strchr(arg, '=');
3366 if (eq)
3367 len = eq - arg;
3368 else
3369 len = strlen(arg);
3370 if (!len || strncmp(arg, arg_long, len))
3371 return 0;
3372 if (eq) {
3373 int n;
3374 char *end;
3375 if (!isdigit(*++eq))
3376 return 0;
3377 n = strtoul(eq, &end, 10);
3378 if (*end)
3379 return 0;
3380 *val = n;
3381 }
3382 return 1;
3383 }
3384
3385 static int diff_scoreopt_parse(const char *opt);
3386
3387 static inline int short_opt(char opt, const char **argv,
3388 const char **optarg)
3389 {
3390 const char *arg = argv[0];
3391 if (arg[0] != '-' || arg[1] != opt)
3392 return 0;
3393 if (arg[2] != '\0') {
3394 *optarg = arg + 2;
3395 return 1;
3396 }
3397 if (!argv[1])
3398 die("Option '%c' requires a value", opt);
3399 *optarg = argv[1];
3400 return 2;
3401 }
3402
3403 int parse_long_opt(const char *opt, const char **argv,
3404 const char **optarg)
3405 {
3406 const char *arg = argv[0];
3407 if (arg[0] != '-' || arg[1] != '-')
3408 return 0;
3409 arg += strlen("--");
3410 if (prefixcmp(arg, opt))
3411 return 0;
3412 arg += strlen(opt);
3413 if (*arg == '=') { /* sticked form: --option=value */
3414 *optarg = arg + 1;
3415 return 1;
3416 }
3417 if (*arg != '\0')
3418 return 0;
3419 /* separate form: --option value */
3420 if (!argv[1])
3421 die("Option '--%s' requires a value", opt);
3422 *optarg = argv[1];
3423 return 2;
3424 }
3425
3426 static int stat_opt(struct diff_options *options, const char **av)
3427 {
3428 const char *arg = av[0];
3429 char *end;
3430 int width = options->stat_width;
3431 int name_width = options->stat_name_width;
3432 int graph_width = options->stat_graph_width;
3433 int count = options->stat_count;
3434 int argcount = 1;
3435
3436 arg += strlen("--stat");
3437 end = (char *)arg;
3438
3439 switch (*arg) {
3440 case '-':
3441 if (!prefixcmp(arg, "-width")) {
3442 arg += strlen("-width");
3443 if (*arg == '=')
3444 width = strtoul(arg + 1, &end, 10);
3445 else if (!*arg && !av[1])
3446 die("Option '--stat-width' requires a value");
3447 else if (!*arg) {
3448 width = strtoul(av[1], &end, 10);
3449 argcount = 2;
3450 }
3451 } else if (!prefixcmp(arg, "-name-width")) {
3452 arg += strlen("-name-width");
3453 if (*arg == '=')
3454 name_width = strtoul(arg + 1, &end, 10);
3455 else if (!*arg && !av[1])
3456 die("Option '--stat-name-width' requires a value");
3457 else if (!*arg) {
3458 name_width = strtoul(av[1], &end, 10);
3459 argcount = 2;
3460 }
3461 } else if (!prefixcmp(arg, "-graph-width")) {
3462 arg += strlen("-graph-width");
3463 if (*arg == '=')
3464 graph_width = strtoul(arg + 1, &end, 10);
3465 else if (!*arg && !av[1])
3466 die("Option '--stat-graph-width' requires a value");
3467 else if (!*arg) {
3468 graph_width = strtoul(av[1], &end, 10);
3469 argcount = 2;
3470 }
3471 } else if (!prefixcmp(arg, "-count")) {
3472 arg += strlen("-count");
3473 if (*arg == '=')
3474 count = strtoul(arg + 1, &end, 10);
3475 else if (!*arg && !av[1])
3476 die("Option '--stat-count' requires a value");
3477 else if (!*arg) {
3478 count = strtoul(av[1], &end, 10);
3479 argcount = 2;
3480 }
3481 }
3482 break;
3483 case '=':
3484 width = strtoul(arg+1, &end, 10);
3485 if (*end == ',')
3486 name_width = strtoul(end+1, &end, 10);
3487 if (*end == ',')
3488 count = strtoul(end+1, &end, 10);
3489 }
3490
3491 /* Important! This checks all the error cases! */
3492 if (*end)
3493 return 0;
3494 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3495 options->stat_name_width = name_width;
3496 options->stat_graph_width = graph_width;
3497 options->stat_width = width;
3498 options->stat_count = count;
3499 return argcount;
3500 }
3501
3502 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3503 {
3504 struct strbuf errmsg = STRBUF_INIT;
3505 if (parse_dirstat_params(options, params, &errmsg))
3506 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3507 errmsg.buf);
3508 strbuf_release(&errmsg);
3509 /*
3510 * The caller knows a dirstat-related option is given from the command
3511 * line; allow it to say "return this_function();"
3512 */
3513 options->output_format |= DIFF_FORMAT_DIRSTAT;
3514 return 1;
3515 }
3516
3517 static int parse_submodule_opt(struct diff_options *options, const char *value)
3518 {
3519 if (parse_submodule_params(options, value))
3520 die(_("Failed to parse --submodule option parameter: '%s'"),
3521 value);
3522 return 1;
3523 }
3524
3525 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3526 {
3527 const char *arg = av[0];
3528 const char *optarg;
3529 int argcount;
3530
3531 /* Output format options */
3532 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3533 options->output_format |= DIFF_FORMAT_PATCH;
3534 else if (opt_arg(arg, 'U', "unified", &options->context))
3535 options->output_format |= DIFF_FORMAT_PATCH;
3536 else if (!strcmp(arg, "--raw"))
3537 options->output_format |= DIFF_FORMAT_RAW;
3538 else if (!strcmp(arg, "--patch-with-raw"))
3539 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3540 else if (!strcmp(arg, "--numstat"))
3541 options->output_format |= DIFF_FORMAT_NUMSTAT;
3542 else if (!strcmp(arg, "--shortstat"))
3543 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3544 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3545 return parse_dirstat_opt(options, "");
3546 else if (!prefixcmp(arg, "-X"))
3547 return parse_dirstat_opt(options, arg + 2);
3548 else if (!prefixcmp(arg, "--dirstat="))
3549 return parse_dirstat_opt(options, arg + 10);
3550 else if (!strcmp(arg, "--cumulative"))
3551 return parse_dirstat_opt(options, "cumulative");
3552 else if (!strcmp(arg, "--dirstat-by-file"))
3553 return parse_dirstat_opt(options, "files");
3554 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3555 parse_dirstat_opt(options, "files");
3556 return parse_dirstat_opt(options, arg + 18);
3557 }
3558 else if (!strcmp(arg, "--check"))
3559 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3560 else if (!strcmp(arg, "--summary"))
3561 options->output_format |= DIFF_FORMAT_SUMMARY;
3562 else if (!strcmp(arg, "--patch-with-stat"))
3563 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3564 else if (!strcmp(arg, "--name-only"))
3565 options->output_format |= DIFF_FORMAT_NAME;
3566 else if (!strcmp(arg, "--name-status"))
3567 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3568 else if (!strcmp(arg, "-s"))
3569 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3570 else if (!prefixcmp(arg, "--stat"))
3571 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3572 return stat_opt(options, av);
3573
3574 /* renames options */
3575 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3576 !strcmp(arg, "--break-rewrites")) {
3577 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3578 return error("invalid argument to -B: %s", arg+2);
3579 }
3580 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3581 !strcmp(arg, "--find-renames")) {
3582 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3583 return error("invalid argument to -M: %s", arg+2);
3584 options->detect_rename = DIFF_DETECT_RENAME;
3585 }
3586 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3587 options->irreversible_delete = 1;
3588 }
3589 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3590 !strcmp(arg, "--find-copies")) {
3591 if (options->detect_rename == DIFF_DETECT_COPY)
3592 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3593 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3594 return error("invalid argument to -C: %s", arg+2);
3595 options->detect_rename = DIFF_DETECT_COPY;
3596 }
3597 else if (!strcmp(arg, "--no-renames"))
3598 options->detect_rename = 0;
3599 else if (!strcmp(arg, "--rename-empty"))
3600 DIFF_OPT_SET(options, RENAME_EMPTY);
3601 else if (!strcmp(arg, "--no-rename-empty"))
3602 DIFF_OPT_CLR(options, RENAME_EMPTY);
3603 else if (!strcmp(arg, "--relative"))
3604 DIFF_OPT_SET(options, RELATIVE_NAME);
3605 else if (!prefixcmp(arg, "--relative=")) {
3606 DIFF_OPT_SET(options, RELATIVE_NAME);
3607 options->prefix = arg + 11;
3608 }
3609
3610 /* xdiff options */
3611 else if (!strcmp(arg, "--minimal"))
3612 DIFF_XDL_SET(options, NEED_MINIMAL);
3613 else if (!strcmp(arg, "--no-minimal"))
3614 DIFF_XDL_CLR(options, NEED_MINIMAL);
3615 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3616 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3617 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3618 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3619 else if (!strcmp(arg, "--ignore-space-at-eol"))
3620 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3621 else if (!strcmp(arg, "--patience"))
3622 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3623 else if (!strcmp(arg, "--histogram"))
3624 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3625
3626 /* flags options */
3627 else if (!strcmp(arg, "--binary")) {
3628 options->output_format |= DIFF_FORMAT_PATCH;
3629 DIFF_OPT_SET(options, BINARY);
3630 }
3631 else if (!strcmp(arg, "--full-index"))
3632 DIFF_OPT_SET(options, FULL_INDEX);
3633 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3634 DIFF_OPT_SET(options, TEXT);
3635 else if (!strcmp(arg, "-R"))
3636 DIFF_OPT_SET(options, REVERSE_DIFF);
3637 else if (!strcmp(arg, "--find-copies-harder"))
3638 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3639 else if (!strcmp(arg, "--follow"))
3640 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3641 else if (!strcmp(arg, "--color"))
3642 options->use_color = 1;
3643 else if (!prefixcmp(arg, "--color=")) {
3644 int value = git_config_colorbool(NULL, arg+8);
3645 if (value < 0)
3646 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3647 options->use_color = value;
3648 }
3649 else if (!strcmp(arg, "--no-color"))
3650 options->use_color = 0;
3651 else if (!strcmp(arg, "--color-words")) {
3652 options->use_color = 1;
3653 options->word_diff = DIFF_WORDS_COLOR;
3654 }
3655 else if (!prefixcmp(arg, "--color-words=")) {
3656 options->use_color = 1;
3657 options->word_diff = DIFF_WORDS_COLOR;
3658 options->word_regex = arg + 14;
3659 }
3660 else if (!strcmp(arg, "--word-diff")) {
3661 if (options->word_diff == DIFF_WORDS_NONE)
3662 options->word_diff = DIFF_WORDS_PLAIN;
3663 }
3664 else if (!prefixcmp(arg, "--word-diff=")) {
3665 const char *type = arg + 12;
3666 if (!strcmp(type, "plain"))
3667 options->word_diff = DIFF_WORDS_PLAIN;
3668 else if (!strcmp(type, "color")) {
3669 options->use_color = 1;
3670 options->word_diff = DIFF_WORDS_COLOR;
3671 }
3672 else if (!strcmp(type, "porcelain"))
3673 options->word_diff = DIFF_WORDS_PORCELAIN;
3674 else if (!strcmp(type, "none"))
3675 options->word_diff = DIFF_WORDS_NONE;
3676 else
3677 die("bad --word-diff argument: %s", type);
3678 }
3679 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3680 if (options->word_diff == DIFF_WORDS_NONE)
3681 options->word_diff = DIFF_WORDS_PLAIN;
3682 options->word_regex = optarg;
3683 return argcount;
3684 }
3685 else if (!strcmp(arg, "--exit-code"))
3686 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3687 else if (!strcmp(arg, "--quiet"))
3688 DIFF_OPT_SET(options, QUICK);
3689 else if (!strcmp(arg, "--ext-diff"))
3690 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3691 else if (!strcmp(arg, "--no-ext-diff"))
3692 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3693 else if (!strcmp(arg, "--textconv"))
3694 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3695 else if (!strcmp(arg, "--no-textconv"))
3696 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3697 else if (!strcmp(arg, "--ignore-submodules")) {
3698 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3699 handle_ignore_submodules_arg(options, "all");
3700 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3701 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3702 handle_ignore_submodules_arg(options, arg + 20);
3703 } else if (!strcmp(arg, "--submodule"))
3704 DIFF_OPT_SET(options, SUBMODULE_LOG);
3705 else if (!prefixcmp(arg, "--submodule="))
3706 return parse_submodule_opt(options, arg + 12);
3707
3708 /* misc options */
3709 else if (!strcmp(arg, "-z"))
3710 options->line_termination = 0;
3711 else if ((argcount = short_opt('l', av, &optarg))) {
3712 options->rename_limit = strtoul(optarg, NULL, 10);
3713 return argcount;
3714 }
3715 else if ((argcount = short_opt('S', av, &optarg))) {
3716 options->pickaxe = optarg;
3717 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3718 return argcount;
3719 } else if ((argcount = short_opt('G', av, &optarg))) {
3720 options->pickaxe = optarg;
3721 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3722 return argcount;
3723 }
3724 else if (!strcmp(arg, "--pickaxe-all"))
3725 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3726 else if (!strcmp(arg, "--pickaxe-regex"))
3727 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3728 else if ((argcount = short_opt('O', av, &optarg))) {
3729 options->orderfile = optarg;
3730 return argcount;
3731 }
3732 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3733 options->filter = optarg;
3734 return argcount;
3735 }
3736 else if (!strcmp(arg, "--abbrev"))
3737 options->abbrev = DEFAULT_ABBREV;
3738 else if (!prefixcmp(arg, "--abbrev=")) {
3739 options->abbrev = strtoul(arg + 9, NULL, 10);
3740 if (options->abbrev < MINIMUM_ABBREV)
3741 options->abbrev = MINIMUM_ABBREV;
3742 else if (40 < options->abbrev)
3743 options->abbrev = 40;
3744 }
3745 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3746 options->a_prefix = optarg;
3747 return argcount;
3748 }
3749 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3750 options->b_prefix = optarg;
3751 return argcount;
3752 }
3753 else if (!strcmp(arg, "--no-prefix"))
3754 options->a_prefix = options->b_prefix = "";
3755 else if (opt_arg(arg, '\0', "inter-hunk-context",
3756 &options->interhunkcontext))
3757 ;
3758 else if (!strcmp(arg, "-W"))
3759 DIFF_OPT_SET(options, FUNCCONTEXT);
3760 else if (!strcmp(arg, "--function-context"))
3761 DIFF_OPT_SET(options, FUNCCONTEXT);
3762 else if (!strcmp(arg, "--no-function-context"))
3763 DIFF_OPT_CLR(options, FUNCCONTEXT);
3764 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3765 options->file = fopen(optarg, "w");
3766 if (!options->file)
3767 die_errno("Could not open '%s'", optarg);
3768 options->close_file = 1;
3769 return argcount;
3770 } else
3771 return 0;
3772 return 1;
3773 }
3774
3775 int parse_rename_score(const char **cp_p)
3776 {
3777 unsigned long num, scale;
3778 int ch, dot;
3779 const char *cp = *cp_p;
3780
3781 num = 0;
3782 scale = 1;
3783 dot = 0;
3784 for (;;) {
3785 ch = *cp;
3786 if ( !dot && ch == '.' ) {
3787 scale = 1;
3788 dot = 1;
3789 } else if ( ch == '%' ) {
3790 scale = dot ? scale*100 : 100;
3791 cp++; /* % is always at the end */
3792 break;
3793 } else if ( ch >= '0' && ch <= '9' ) {
3794 if ( scale < 100000 ) {
3795 scale *= 10;
3796 num = (num*10) + (ch-'0');
3797 }
3798 } else {
3799 break;
3800 }
3801 cp++;
3802 }
3803 *cp_p = cp;
3804
3805 /* user says num divided by scale and we say internally that
3806 * is MAX_SCORE * num / scale.
3807 */
3808 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3809 }
3810
3811 static int diff_scoreopt_parse(const char *opt)
3812 {
3813 int opt1, opt2, cmd;
3814
3815 if (*opt++ != '-')
3816 return -1;
3817 cmd = *opt++;
3818 if (cmd == '-') {
3819 /* convert the long-form arguments into short-form versions */
3820 if (!prefixcmp(opt, "break-rewrites")) {
3821 opt += strlen("break-rewrites");
3822 if (*opt == 0 || *opt++ == '=')
3823 cmd = 'B';
3824 } else if (!prefixcmp(opt, "find-copies")) {
3825 opt += strlen("find-copies");
3826 if (*opt == 0 || *opt++ == '=')
3827 cmd = 'C';
3828 } else if (!prefixcmp(opt, "find-renames")) {
3829 opt += strlen("find-renames");
3830 if (*opt == 0 || *opt++ == '=')
3831 cmd = 'M';
3832 }
3833 }
3834 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3835 return -1; /* that is not a -M, -C nor -B option */
3836
3837 opt1 = parse_rename_score(&opt);
3838 if (cmd != 'B')
3839 opt2 = 0;
3840 else {
3841 if (*opt == 0)
3842 opt2 = 0;
3843 else if (*opt != '/')
3844 return -1; /* we expect -B80/99 or -B80 */
3845 else {
3846 opt++;
3847 opt2 = parse_rename_score(&opt);
3848 }
3849 }
3850 if (*opt != 0)
3851 return -1;
3852 return opt1 | (opt2 << 16);
3853 }
3854
3855 struct diff_queue_struct diff_queued_diff;
3856
3857 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3858 {
3859 if (queue->alloc <= queue->nr) {
3860 queue->alloc = alloc_nr(queue->alloc);
3861 queue->queue = xrealloc(queue->queue,
3862 sizeof(dp) * queue->alloc);
3863 }
3864 queue->queue[queue->nr++] = dp;
3865 }
3866
3867 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3868 struct diff_filespec *one,
3869 struct diff_filespec *two)
3870 {
3871 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3872 dp->one = one;
3873 dp->two = two;
3874 if (queue)
3875 diff_q(queue, dp);
3876 return dp;
3877 }
3878
3879 void diff_free_filepair(struct diff_filepair *p)
3880 {
3881 free_filespec(p->one);
3882 free_filespec(p->two);
3883 free(p);
3884 }
3885
3886 /* This is different from find_unique_abbrev() in that
3887 * it stuffs the result with dots for alignment.
3888 */
3889 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3890 {
3891 int abblen;
3892 const char *abbrev;
3893 if (len == 40)
3894 return sha1_to_hex(sha1);
3895
3896 abbrev = find_unique_abbrev(sha1, len);
3897 abblen = strlen(abbrev);
3898 if (abblen < 37) {
3899 static char hex[41];
3900 if (len < abblen && abblen <= len + 2)
3901 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3902 else
3903 sprintf(hex, "%s...", abbrev);
3904 return hex;
3905 }
3906 return sha1_to_hex(sha1);
3907 }
3908
3909 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3910 {
3911 int line_termination = opt->line_termination;
3912 int inter_name_termination = line_termination ? '\t' : '\0';
3913 if (opt->output_prefix) {
3914 struct strbuf *msg = NULL;
3915 msg = opt->output_prefix(opt, opt->output_prefix_data);
3916 fprintf(opt->file, "%s", msg->buf);
3917 }
3918
3919 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3920 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3921 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3922 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3923 }
3924 if (p->score) {
3925 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3926 inter_name_termination);
3927 } else {
3928 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3929 }
3930
3931 if (p->status == DIFF_STATUS_COPIED ||
3932 p->status == DIFF_STATUS_RENAMED) {
3933 const char *name_a, *name_b;
3934 name_a = p->one->path;
3935 name_b = p->two->path;
3936 strip_prefix(opt->prefix_length, &name_a, &name_b);
3937 write_name_quoted(name_a, opt->file, inter_name_termination);
3938 write_name_quoted(name_b, opt->file, line_termination);
3939 } else {
3940 const char *name_a, *name_b;
3941 name_a = p->one->mode ? p->one->path : p->two->path;
3942 name_b = NULL;
3943 strip_prefix(opt->prefix_length, &name_a, &name_b);
3944 write_name_quoted(name_a, opt->file, line_termination);
3945 }
3946 }
3947
3948 int diff_unmodified_pair(struct diff_filepair *p)
3949 {
3950 /* This function is written stricter than necessary to support
3951 * the currently implemented transformers, but the idea is to
3952 * let transformers to produce diff_filepairs any way they want,
3953 * and filter and clean them up here before producing the output.
3954 */
3955 struct diff_filespec *one = p->one, *two = p->two;
3956
3957 if (DIFF_PAIR_UNMERGED(p))
3958 return 0; /* unmerged is interesting */
3959
3960 /* deletion, addition, mode or type change
3961 * and rename are all interesting.
3962 */
3963 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3964 DIFF_PAIR_MODE_CHANGED(p) ||
3965 strcmp(one->path, two->path))
3966 return 0;
3967
3968 /* both are valid and point at the same path. that is, we are
3969 * dealing with a change.
3970 */
3971 if (one->sha1_valid && two->sha1_valid &&
3972 !hashcmp(one->sha1, two->sha1) &&
3973 !one->dirty_submodule && !two->dirty_submodule)
3974 return 1; /* no change */
3975 if (!one->sha1_valid && !two->sha1_valid)
3976 return 1; /* both look at the same file on the filesystem. */
3977 return 0;
3978 }
3979
3980 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3981 {
3982 if (diff_unmodified_pair(p))
3983 return;
3984
3985 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3986 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3987 return; /* no tree diffs in patch format */
3988
3989 run_diff(p, o);
3990 }
3991
3992 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3993 struct diffstat_t *diffstat)
3994 {
3995 if (diff_unmodified_pair(p))
3996 return;
3997
3998 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3999 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4000 return; /* no useful stat for tree diffs */
4001
4002 run_diffstat(p, o, diffstat);
4003 }
4004
4005 static void diff_flush_checkdiff(struct diff_filepair *p,
4006 struct diff_options *o)
4007 {
4008 if (diff_unmodified_pair(p))
4009 return;
4010
4011 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4012 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4013 return; /* nothing to check in tree diffs */
4014
4015 run_checkdiff(p, o);
4016 }
4017
4018 int diff_queue_is_empty(void)
4019 {
4020 struct diff_queue_struct *q = &diff_queued_diff;
4021 int i;
4022 for (i = 0; i < q->nr; i++)
4023 if (!diff_unmodified_pair(q->queue[i]))
4024 return 0;
4025 return 1;
4026 }
4027
4028 #if DIFF_DEBUG
4029 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4030 {
4031 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4032 x, one ? one : "",
4033 s->path,
4034 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4035 s->mode,
4036 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4037 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
4038 x, one ? one : "",
4039 s->size, s->xfrm_flags);
4040 }
4041
4042 void diff_debug_filepair(const struct diff_filepair *p, int i)
4043 {
4044 diff_debug_filespec(p->one, i, "one");
4045 diff_debug_filespec(p->two, i, "two");
4046 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4047 p->score, p->status ? p->status : '?',
4048 p->one->rename_used, p->broken_pair);
4049 }
4050
4051 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4052 {
4053 int i;
4054 if (msg)
4055 fprintf(stderr, "%s\n", msg);
4056 fprintf(stderr, "q->nr = %d\n", q->nr);
4057 for (i = 0; i < q->nr; i++) {
4058 struct diff_filepair *p = q->queue[i];
4059 diff_debug_filepair(p, i);
4060 }
4061 }
4062 #endif
4063
4064 static void diff_resolve_rename_copy(void)
4065 {
4066 int i;
4067 struct diff_filepair *p;
4068 struct diff_queue_struct *q = &diff_queued_diff;
4069
4070 diff_debug_queue("resolve-rename-copy", q);
4071
4072 for (i = 0; i < q->nr; i++) {
4073 p = q->queue[i];
4074 p->status = 0; /* undecided */
4075 if (DIFF_PAIR_UNMERGED(p))
4076 p->status = DIFF_STATUS_UNMERGED;
4077 else if (!DIFF_FILE_VALID(p->one))
4078 p->status = DIFF_STATUS_ADDED;
4079 else if (!DIFF_FILE_VALID(p->two))
4080 p->status = DIFF_STATUS_DELETED;
4081 else if (DIFF_PAIR_TYPE_CHANGED(p))
4082 p->status = DIFF_STATUS_TYPE_CHANGED;
4083
4084 /* from this point on, we are dealing with a pair
4085 * whose both sides are valid and of the same type, i.e.
4086 * either in-place edit or rename/copy edit.
4087 */
4088 else if (DIFF_PAIR_RENAME(p)) {
4089 /*
4090 * A rename might have re-connected a broken
4091 * pair up, causing the pathnames to be the
4092 * same again. If so, that's not a rename at
4093 * all, just a modification..
4094 *
4095 * Otherwise, see if this source was used for
4096 * multiple renames, in which case we decrement
4097 * the count, and call it a copy.
4098 */
4099 if (!strcmp(p->one->path, p->two->path))
4100 p->status = DIFF_STATUS_MODIFIED;
4101 else if (--p->one->rename_used > 0)
4102 p->status = DIFF_STATUS_COPIED;
4103 else
4104 p->status = DIFF_STATUS_RENAMED;
4105 }
4106 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4107 p->one->mode != p->two->mode ||
4108 p->one->dirty_submodule ||
4109 p->two->dirty_submodule ||
4110 is_null_sha1(p->one->sha1))
4111 p->status = DIFF_STATUS_MODIFIED;
4112 else {
4113 /* This is a "no-change" entry and should not
4114 * happen anymore, but prepare for broken callers.
4115 */
4116 error("feeding unmodified %s to diffcore",
4117 p->one->path);
4118 p->status = DIFF_STATUS_UNKNOWN;
4119 }
4120 }
4121 diff_debug_queue("resolve-rename-copy done", q);
4122 }
4123
4124 static int check_pair_status(struct diff_filepair *p)
4125 {
4126 switch (p->status) {
4127 case DIFF_STATUS_UNKNOWN:
4128 return 0;
4129 case 0:
4130 die("internal error in diff-resolve-rename-copy");
4131 default:
4132 return 1;
4133 }
4134 }
4135
4136 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4137 {
4138 int fmt = opt->output_format;
4139
4140 if (fmt & DIFF_FORMAT_CHECKDIFF)
4141 diff_flush_checkdiff(p, opt);
4142 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4143 diff_flush_raw(p, opt);
4144 else if (fmt & DIFF_FORMAT_NAME) {
4145 const char *name_a, *name_b;
4146 name_a = p->two->path;
4147 name_b = NULL;
4148 strip_prefix(opt->prefix_length, &name_a, &name_b);
4149 write_name_quoted(name_a, opt->file, opt->line_termination);
4150 }
4151 }
4152
4153 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4154 {
4155 if (fs->mode)
4156 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4157 else
4158 fprintf(file, " %s ", newdelete);
4159 write_name_quoted(fs->path, file, '\n');
4160 }
4161
4162
4163 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4164 const char *line_prefix)
4165 {
4166 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4167 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4168 p->two->mode, show_name ? ' ' : '\n');
4169 if (show_name) {
4170 write_name_quoted(p->two->path, file, '\n');
4171 }
4172 }
4173 }
4174
4175 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4176 const char *line_prefix)
4177 {
4178 char *names = pprint_rename(p->one->path, p->two->path);
4179
4180 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4181 free(names);
4182 show_mode_change(file, p, 0, line_prefix);
4183 }
4184
4185 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4186 {
4187 FILE *file = opt->file;
4188 char *line_prefix = "";
4189
4190 if (opt->output_prefix) {
4191 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4192 line_prefix = buf->buf;
4193 }
4194
4195 switch(p->status) {
4196 case DIFF_STATUS_DELETED:
4197 fputs(line_prefix, file);
4198 show_file_mode_name(file, "delete", p->one);
4199 break;
4200 case DIFF_STATUS_ADDED:
4201 fputs(line_prefix, file);
4202 show_file_mode_name(file, "create", p->two);
4203 break;
4204 case DIFF_STATUS_COPIED:
4205 fputs(line_prefix, file);
4206 show_rename_copy(file, "copy", p, line_prefix);
4207 break;
4208 case DIFF_STATUS_RENAMED:
4209 fputs(line_prefix, file);
4210 show_rename_copy(file, "rename", p, line_prefix);
4211 break;
4212 default:
4213 if (p->score) {
4214 fprintf(file, "%s rewrite ", line_prefix);
4215 write_name_quoted(p->two->path, file, ' ');
4216 fprintf(file, "(%d%%)\n", similarity_index(p));
4217 }
4218 show_mode_change(file, p, !p->score, line_prefix);
4219 break;
4220 }
4221 }
4222
4223 struct patch_id_t {
4224 git_SHA_CTX *ctx;
4225 int patchlen;
4226 };
4227
4228 static int remove_space(char *line, int len)
4229 {
4230 int i;
4231 char *dst = line;
4232 unsigned char c;
4233
4234 for (i = 0; i < len; i++)
4235 if (!isspace((c = line[i])))
4236 *dst++ = c;
4237
4238 return dst - line;
4239 }
4240
4241 static void patch_id_consume(void *priv, char *line, unsigned long len)
4242 {
4243 struct patch_id_t *data = priv;
4244 int new_len;
4245
4246 /* Ignore line numbers when computing the SHA1 of the patch */
4247 if (!prefixcmp(line, "@@ -"))
4248 return;
4249
4250 new_len = remove_space(line, len);
4251
4252 git_SHA1_Update(data->ctx, line, new_len);
4253 data->patchlen += new_len;
4254 }
4255
4256 /* returns 0 upon success, and writes result into sha1 */
4257 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4258 {
4259 struct diff_queue_struct *q = &diff_queued_diff;
4260 int i;
4261 git_SHA_CTX ctx;
4262 struct patch_id_t data;
4263 char buffer[PATH_MAX * 4 + 20];
4264
4265 git_SHA1_Init(&ctx);
4266 memset(&data, 0, sizeof(struct patch_id_t));
4267 data.ctx = &ctx;
4268
4269 for (i = 0; i < q->nr; i++) {
4270 xpparam_t xpp;
4271 xdemitconf_t xecfg;
4272 mmfile_t mf1, mf2;
4273 struct diff_filepair *p = q->queue[i];
4274 int len1, len2;
4275
4276 memset(&xpp, 0, sizeof(xpp));
4277 memset(&xecfg, 0, sizeof(xecfg));
4278 if (p->status == 0)
4279 return error("internal diff status error");
4280 if (p->status == DIFF_STATUS_UNKNOWN)
4281 continue;
4282 if (diff_unmodified_pair(p))
4283 continue;
4284 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4285 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4286 continue;
4287 if (DIFF_PAIR_UNMERGED(p))
4288 continue;
4289
4290 diff_fill_sha1_info(p->one);
4291 diff_fill_sha1_info(p->two);
4292 if (fill_mmfile(&mf1, p->one) < 0 ||
4293 fill_mmfile(&mf2, p->two) < 0)
4294 return error("unable to read files to diff");
4295
4296 len1 = remove_space(p->one->path, strlen(p->one->path));
4297 len2 = remove_space(p->two->path, strlen(p->two->path));
4298 if (p->one->mode == 0)
4299 len1 = snprintf(buffer, sizeof(buffer),
4300 "diff--gita/%.*sb/%.*s"
4301 "newfilemode%06o"
4302 "---/dev/null"
4303 "+++b/%.*s",
4304 len1, p->one->path,
4305 len2, p->two->path,
4306 p->two->mode,
4307 len2, p->two->path);
4308 else if (p->two->mode == 0)
4309 len1 = snprintf(buffer, sizeof(buffer),
4310 "diff--gita/%.*sb/%.*s"
4311 "deletedfilemode%06o"
4312 "---a/%.*s"
4313 "+++/dev/null",
4314 len1, p->one->path,
4315 len2, p->two->path,
4316 p->one->mode,
4317 len1, p->one->path);
4318 else
4319 len1 = snprintf(buffer, sizeof(buffer),
4320 "diff--gita/%.*sb/%.*s"
4321 "---a/%.*s"
4322 "+++b/%.*s",
4323 len1, p->one->path,
4324 len2, p->two->path,
4325 len1, p->one->path,
4326 len2, p->two->path);
4327 git_SHA1_Update(&ctx, buffer, len1);
4328
4329 if (diff_filespec_is_binary(p->one) ||
4330 diff_filespec_is_binary(p->two)) {
4331 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4332 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4333 continue;
4334 }
4335
4336 xpp.flags = 0;
4337 xecfg.ctxlen = 3;
4338 xecfg.flags = 0;
4339 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4340 &xpp, &xecfg);
4341 }
4342
4343 git_SHA1_Final(sha1, &ctx);
4344 return 0;
4345 }
4346
4347 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4348 {
4349 struct diff_queue_struct *q = &diff_queued_diff;
4350 int i;
4351 int result = diff_get_patch_id(options, sha1);
4352
4353 for (i = 0; i < q->nr; i++)
4354 diff_free_filepair(q->queue[i]);
4355
4356 free(q->queue);
4357 DIFF_QUEUE_CLEAR(q);
4358
4359 return result;
4360 }
4361
4362 static int is_summary_empty(const struct diff_queue_struct *q)
4363 {
4364 int i;
4365
4366 for (i = 0; i < q->nr; i++) {
4367 const struct diff_filepair *p = q->queue[i];
4368
4369 switch (p->status) {
4370 case DIFF_STATUS_DELETED:
4371 case DIFF_STATUS_ADDED:
4372 case DIFF_STATUS_COPIED:
4373 case DIFF_STATUS_RENAMED:
4374 return 0;
4375 default:
4376 if (p->score)
4377 return 0;
4378 if (p->one->mode && p->two->mode &&
4379 p->one->mode != p->two->mode)
4380 return 0;
4381 break;
4382 }
4383 }
4384 return 1;
4385 }
4386
4387 static const char rename_limit_warning[] =
4388 "inexact rename detection was skipped due to too many files.";
4389
4390 static const char degrade_cc_to_c_warning[] =
4391 "only found copies from modified paths due to too many files.";
4392
4393 static const char rename_limit_advice[] =
4394 "you may want to set your %s variable to at least "
4395 "%d and retry the command.";
4396
4397 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4398 {
4399 if (degraded_cc)
4400 warning(degrade_cc_to_c_warning);
4401 else if (needed)
4402 warning(rename_limit_warning);
4403 else
4404 return;
4405 if (0 < needed && needed < 32767)
4406 warning(rename_limit_advice, varname, needed);
4407 }
4408
4409 void diff_flush(struct diff_options *options)
4410 {
4411 struct diff_queue_struct *q = &diff_queued_diff;
4412 int i, output_format = options->output_format;
4413 int separator = 0;
4414 int dirstat_by_line = 0;
4415
4416 /*
4417 * Order: raw, stat, summary, patch
4418 * or: name/name-status/checkdiff (other bits clear)
4419 */
4420 if (!q->nr)
4421 goto free_queue;
4422
4423 if (output_format & (DIFF_FORMAT_RAW |
4424 DIFF_FORMAT_NAME |
4425 DIFF_FORMAT_NAME_STATUS |
4426 DIFF_FORMAT_CHECKDIFF)) {
4427 for (i = 0; i < q->nr; i++) {
4428 struct diff_filepair *p = q->queue[i];
4429 if (check_pair_status(p))
4430 flush_one_pair(p, options);
4431 }
4432 separator++;
4433 }
4434
4435 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4436 dirstat_by_line = 1;
4437
4438 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4439 dirstat_by_line) {
4440 struct diffstat_t diffstat;
4441
4442 memset(&diffstat, 0, sizeof(struct diffstat_t));
4443 for (i = 0; i < q->nr; i++) {
4444 struct diff_filepair *p = q->queue[i];
4445 if (check_pair_status(p))
4446 diff_flush_stat(p, options, &diffstat);
4447 }
4448 if (output_format & DIFF_FORMAT_NUMSTAT)
4449 show_numstat(&diffstat, options);
4450 if (output_format & DIFF_FORMAT_DIFFSTAT)
4451 show_stats(&diffstat, options);
4452 if (output_format & DIFF_FORMAT_SHORTSTAT)
4453 show_shortstats(&diffstat, options);
4454 if (output_format & DIFF_FORMAT_DIRSTAT)
4455 show_dirstat_by_line(&diffstat, options);
4456 free_diffstat_info(&diffstat);
4457 separator++;
4458 }
4459 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4460 show_dirstat(options);
4461
4462 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4463 for (i = 0; i < q->nr; i++) {
4464 diff_summary(options, q->queue[i]);
4465 }
4466 separator++;
4467 }
4468
4469 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4470 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4471 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4472 /*
4473 * run diff_flush_patch for the exit status. setting
4474 * options->file to /dev/null should be safe, becaue we
4475 * aren't supposed to produce any output anyway.
4476 */
4477 if (options->close_file)
4478 fclose(options->file);
4479 options->file = fopen("/dev/null", "w");
4480 if (!options->file)
4481 die_errno("Could not open /dev/null");
4482 options->close_file = 1;
4483 for (i = 0; i < q->nr; i++) {
4484 struct diff_filepair *p = q->queue[i];
4485 if (check_pair_status(p))
4486 diff_flush_patch(p, options);
4487 if (options->found_changes)
4488 break;
4489 }
4490 }
4491
4492 if (output_format & DIFF_FORMAT_PATCH) {
4493 if (separator) {
4494 if (options->output_prefix) {
4495 struct strbuf *msg = NULL;
4496 msg = options->output_prefix(options,
4497 options->output_prefix_data);
4498 fwrite(msg->buf, msg->len, 1, stdout);
4499 }
4500 putc(options->line_termination, options->file);
4501 if (options->stat_sep) {
4502 /* attach patch instead of inline */
4503 fputs(options->stat_sep, options->file);
4504 }
4505 }
4506
4507 for (i = 0; i < q->nr; i++) {
4508 struct diff_filepair *p = q->queue[i];
4509 if (check_pair_status(p))
4510 diff_flush_patch(p, options);
4511 }
4512 }
4513
4514 if (output_format & DIFF_FORMAT_CALLBACK)
4515 options->format_callback(q, options, options->format_callback_data);
4516
4517 for (i = 0; i < q->nr; i++)
4518 diff_free_filepair(q->queue[i]);
4519 free_queue:
4520 free(q->queue);
4521 DIFF_QUEUE_CLEAR(q);
4522 if (options->close_file)
4523 fclose(options->file);
4524
4525 /*
4526 * Report the content-level differences with HAS_CHANGES;
4527 * diff_addremove/diff_change does not set the bit when
4528 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4529 */
4530 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4531 if (options->found_changes)
4532 DIFF_OPT_SET(options, HAS_CHANGES);
4533 else
4534 DIFF_OPT_CLR(options, HAS_CHANGES);
4535 }
4536 }
4537
4538 static void diffcore_apply_filter(const char *filter)
4539 {
4540 int i;
4541 struct diff_queue_struct *q = &diff_queued_diff;
4542 struct diff_queue_struct outq;
4543 DIFF_QUEUE_CLEAR(&outq);
4544
4545 if (!filter)
4546 return;
4547
4548 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4549 int found;
4550 for (i = found = 0; !found && i < q->nr; i++) {
4551 struct diff_filepair *p = q->queue[i];
4552 if (((p->status == DIFF_STATUS_MODIFIED) &&
4553 ((p->score &&
4554 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4555 (!p->score &&
4556 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4557 ((p->status != DIFF_STATUS_MODIFIED) &&
4558 strchr(filter, p->status)))
4559 found++;
4560 }
4561 if (found)
4562 return;
4563
4564 /* otherwise we will clear the whole queue
4565 * by copying the empty outq at the end of this
4566 * function, but first clear the current entries
4567 * in the queue.
4568 */
4569 for (i = 0; i < q->nr; i++)
4570 diff_free_filepair(q->queue[i]);
4571 }
4572 else {
4573 /* Only the matching ones */
4574 for (i = 0; i < q->nr; i++) {
4575 struct diff_filepair *p = q->queue[i];
4576
4577 if (((p->status == DIFF_STATUS_MODIFIED) &&
4578 ((p->score &&
4579 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4580 (!p->score &&
4581 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4582 ((p->status != DIFF_STATUS_MODIFIED) &&
4583 strchr(filter, p->status)))
4584 diff_q(&outq, p);
4585 else
4586 diff_free_filepair(p);
4587 }
4588 }
4589 free(q->queue);
4590 *q = outq;
4591 }
4592
4593 /* Check whether two filespecs with the same mode and size are identical */
4594 static int diff_filespec_is_identical(struct diff_filespec *one,
4595 struct diff_filespec *two)
4596 {
4597 if (S_ISGITLINK(one->mode))
4598 return 0;
4599 if (diff_populate_filespec(one, 0))
4600 return 0;
4601 if (diff_populate_filespec(two, 0))
4602 return 0;
4603 return !memcmp(one->data, two->data, one->size);
4604 }
4605
4606 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4607 {
4608 int i;
4609 struct diff_queue_struct *q = &diff_queued_diff;
4610 struct diff_queue_struct outq;
4611 DIFF_QUEUE_CLEAR(&outq);
4612
4613 for (i = 0; i < q->nr; i++) {
4614 struct diff_filepair *p = q->queue[i];
4615
4616 /*
4617 * 1. Entries that come from stat info dirtiness
4618 * always have both sides (iow, not create/delete),
4619 * one side of the object name is unknown, with
4620 * the same mode and size. Keep the ones that
4621 * do not match these criteria. They have real
4622 * differences.
4623 *
4624 * 2. At this point, the file is known to be modified,
4625 * with the same mode and size, and the object
4626 * name of one side is unknown. Need to inspect
4627 * the identical contents.
4628 */
4629 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4630 !DIFF_FILE_VALID(p->two) ||
4631 (p->one->sha1_valid && p->two->sha1_valid) ||
4632 (p->one->mode != p->two->mode) ||
4633 diff_populate_filespec(p->one, 1) ||
4634 diff_populate_filespec(p->two, 1) ||
4635 (p->one->size != p->two->size) ||
4636 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4637 diff_q(&outq, p);
4638 else {
4639 /*
4640 * The caller can subtract 1 from skip_stat_unmatch
4641 * to determine how many paths were dirty only
4642 * due to stat info mismatch.
4643 */
4644 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4645 diffopt->skip_stat_unmatch++;
4646 diff_free_filepair(p);
4647 }
4648 }
4649 free(q->queue);
4650 *q = outq;
4651 }
4652
4653 static int diffnamecmp(const void *a_, const void *b_)
4654 {
4655 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4656 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4657 const char *name_a, *name_b;
4658
4659 name_a = a->one ? a->one->path : a->two->path;
4660 name_b = b->one ? b->one->path : b->two->path;
4661 return strcmp(name_a, name_b);
4662 }
4663
4664 void diffcore_fix_diff_index(struct diff_options *options)
4665 {
4666 struct diff_queue_struct *q = &diff_queued_diff;
4667 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4668 }
4669
4670 void diffcore_std(struct diff_options *options)
4671 {
4672 if (options->skip_stat_unmatch)
4673 diffcore_skip_stat_unmatch(options);
4674 if (!options->found_follow) {
4675 /* See try_to_follow_renames() in tree-diff.c */
4676 if (options->break_opt != -1)
4677 diffcore_break(options->break_opt);
4678 if (options->detect_rename)
4679 diffcore_rename(options);
4680 if (options->break_opt != -1)
4681 diffcore_merge_broken();
4682 }
4683 if (options->pickaxe)
4684 diffcore_pickaxe(options);
4685 if (options->orderfile)
4686 diffcore_order(options->orderfile);
4687 if (!options->found_follow)
4688 /* See try_to_follow_renames() in tree-diff.c */
4689 diff_resolve_rename_copy();
4690 diffcore_apply_filter(options->filter);
4691
4692 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4693 DIFF_OPT_SET(options, HAS_CHANGES);
4694 else
4695 DIFF_OPT_CLR(options, HAS_CHANGES);
4696
4697 options->found_follow = 0;
4698 }
4699
4700 int diff_result_code(struct diff_options *opt, int status)
4701 {
4702 int result = 0;
4703
4704 diff_warn_rename_limit("diff.renamelimit",
4705 opt->needed_rename_limit,
4706 opt->degraded_cc_to_c);
4707 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4708 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4709 return status;
4710 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4711 DIFF_OPT_TST(opt, HAS_CHANGES))
4712 result |= 01;
4713 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4714 DIFF_OPT_TST(opt, CHECK_FAILED))
4715 result |= 02;
4716 return result;
4717 }
4718
4719 int diff_can_quit_early(struct diff_options *opt)
4720 {
4721 return (DIFF_OPT_TST(opt, QUICK) &&
4722 !opt->filter &&
4723 DIFF_OPT_TST(opt, HAS_CHANGES));
4724 }
4725
4726 /*
4727 * Shall changes to this submodule be ignored?
4728 *
4729 * Submodule changes can be configured to be ignored separately for each path,
4730 * but that configuration can be overridden from the command line.
4731 */
4732 static int is_submodule_ignored(const char *path, struct diff_options *options)
4733 {
4734 int ignored = 0;
4735 unsigned orig_flags = options->flags;
4736 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4737 set_diffopt_flags_from_submodule_config(options, path);
4738 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4739 ignored = 1;
4740 options->flags = orig_flags;
4741 return ignored;
4742 }
4743
4744 void diff_addremove(struct diff_options *options,
4745 int addremove, unsigned mode,
4746 const unsigned char *sha1,
4747 int sha1_valid,
4748 const char *concatpath, unsigned dirty_submodule)
4749 {
4750 struct diff_filespec *one, *two;
4751
4752 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4753 return;
4754
4755 /* This may look odd, but it is a preparation for
4756 * feeding "there are unchanged files which should
4757 * not produce diffs, but when you are doing copy
4758 * detection you would need them, so here they are"
4759 * entries to the diff-core. They will be prefixed
4760 * with something like '=' or '*' (I haven't decided
4761 * which but should not make any difference).
4762 * Feeding the same new and old to diff_change()
4763 * also has the same effect.
4764 * Before the final output happens, they are pruned after
4765 * merged into rename/copy pairs as appropriate.
4766 */
4767 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4768 addremove = (addremove == '+' ? '-' :
4769 addremove == '-' ? '+' : addremove);
4770
4771 if (options->prefix &&
4772 strncmp(concatpath, options->prefix, options->prefix_length))
4773 return;
4774
4775 one = alloc_filespec(concatpath);
4776 two = alloc_filespec(concatpath);
4777
4778 if (addremove != '+')
4779 fill_filespec(one, sha1, sha1_valid, mode);
4780 if (addremove != '-') {
4781 fill_filespec(two, sha1, sha1_valid, mode);
4782 two->dirty_submodule = dirty_submodule;
4783 }
4784
4785 diff_queue(&diff_queued_diff, one, two);
4786 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4787 DIFF_OPT_SET(options, HAS_CHANGES);
4788 }
4789
4790 void diff_change(struct diff_options *options,
4791 unsigned old_mode, unsigned new_mode,
4792 const unsigned char *old_sha1,
4793 const unsigned char *new_sha1,
4794 int old_sha1_valid, int new_sha1_valid,
4795 const char *concatpath,
4796 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4797 {
4798 struct diff_filespec *one, *two;
4799
4800 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4801 is_submodule_ignored(concatpath, options))
4802 return;
4803
4804 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4805 unsigned tmp;
4806 const unsigned char *tmp_c;
4807 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4808 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4809 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4810 new_sha1_valid = tmp;
4811 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4812 new_dirty_submodule = tmp;
4813 }
4814
4815 if (options->prefix &&
4816 strncmp(concatpath, options->prefix, options->prefix_length))
4817 return;
4818
4819 one = alloc_filespec(concatpath);
4820 two = alloc_filespec(concatpath);
4821 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4822 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4823 one->dirty_submodule = old_dirty_submodule;
4824 two->dirty_submodule = new_dirty_submodule;
4825
4826 diff_queue(&diff_queued_diff, one, two);
4827 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4828 DIFF_OPT_SET(options, HAS_CHANGES);
4829 }
4830
4831 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4832 {
4833 struct diff_filepair *pair;
4834 struct diff_filespec *one, *two;
4835
4836 if (options->prefix &&
4837 strncmp(path, options->prefix, options->prefix_length))
4838 return NULL;
4839
4840 one = alloc_filespec(path);
4841 two = alloc_filespec(path);
4842 pair = diff_queue(&diff_queued_diff, one, two);
4843 pair->is_unmerged = 1;
4844 return pair;
4845 }
4846
4847 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4848 size_t *outsize)
4849 {
4850 struct diff_tempfile *temp;
4851 const char *argv[3];
4852 const char **arg = argv;
4853 struct child_process child;
4854 struct strbuf buf = STRBUF_INIT;
4855 int err = 0;
4856
4857 temp = prepare_temp_file(spec->path, spec);
4858 *arg++ = pgm;
4859 *arg++ = temp->name;
4860 *arg = NULL;
4861
4862 memset(&child, 0, sizeof(child));
4863 child.use_shell = 1;
4864 child.argv = argv;
4865 child.out = -1;
4866 if (start_command(&child)) {
4867 remove_tempfile();
4868 return NULL;
4869 }
4870
4871 if (strbuf_read(&buf, child.out, 0) < 0)
4872 err = error("error reading from textconv command '%s'", pgm);
4873 close(child.out);
4874
4875 if (finish_command(&child) || err) {
4876 strbuf_release(&buf);
4877 remove_tempfile();
4878 return NULL;
4879 }
4880 remove_tempfile();
4881
4882 return strbuf_detach(&buf, outsize);
4883 }
4884
4885 size_t fill_textconv(struct userdiff_driver *driver,
4886 struct diff_filespec *df,
4887 char **outbuf)
4888 {
4889 size_t size;
4890
4891 if (!driver || !driver->textconv) {
4892 if (!DIFF_FILE_VALID(df)) {
4893 *outbuf = "";
4894 return 0;
4895 }
4896 if (diff_populate_filespec(df, 0))
4897 die("unable to read files to diff");
4898 *outbuf = df->data;
4899 return df->size;
4900 }
4901
4902 if (driver->textconv_cache && df->sha1_valid) {
4903 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4904 &size);
4905 if (*outbuf)
4906 return size;
4907 }
4908
4909 *outbuf = run_textconv(driver->textconv, df, &size);
4910 if (!*outbuf)
4911 die("unable to read files to diff");
4912
4913 if (driver->textconv_cache && df->sha1_valid) {
4914 /* ignore errors, as we might be in a readonly repository */
4915 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4916 size);
4917 /*
4918 * we could save up changes and flush them all at the end,
4919 * but we would need an extra call after all diffing is done.
4920 * Since generating a cache entry is the slow path anyway,
4921 * this extra overhead probably isn't a big deal.
4922 */
4923 notes_cache_write(driver->textconv_cache);
4924 }
4925
4926 return size;
4927 }
4928
4929 void setup_diff_pager(struct diff_options *opt)
4930 {
4931 /*
4932 * If the user asked for our exit code, then either they want --quiet
4933 * or --exit-code. We should definitely not bother with a pager in the
4934 * former case, as we will generate no output. Since we still properly
4935 * report our exit code even when a pager is run, we _could_ run a
4936 * pager with --exit-code. But since we have not done so historically,
4937 * and because it is easy to find people oneline advising "git diff
4938 * --exit-code" in hooks and other scripts, we do not do so.
4939 */
4940 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4941 check_pager_config("diff") != 0)
4942 setup_pager();
4943 }
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