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apply --whitespace=fix: avoid running over the postimage buffer
[alt-git.git] / diff.c
blob374b2354f3eb51e7055eb2014cc84661aac13e14
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18
19 #ifdef NO_FAST_WORKING_DIRECTORY
20 #define FAST_WORKING_DIRECTORY 0
21 #else
22 #define FAST_WORKING_DIRECTORY 1
23 #endif
24
25 static int diff_detect_rename_default;
26 static int diff_rename_limit_default = 400;
27 static int diff_suppress_blank_empty;
28 static int diff_use_color_default = -1;
29 static const char *diff_word_regex_cfg;
30 static const char *external_diff_cmd_cfg;
31 int diff_auto_refresh_index = 1;
32 static int diff_mnemonic_prefix;
33 static int diff_no_prefix;
34 static int diff_stat_graph_width;
35 static int diff_dirstat_permille_default = 30;
36 static struct diff_options default_diff_options;
37
38 static char diff_colors[][COLOR_MAXLEN] = {
39 GIT_COLOR_RESET,
40 GIT_COLOR_NORMAL, /* PLAIN */
41 GIT_COLOR_BOLD, /* METAINFO */
42 GIT_COLOR_CYAN, /* FRAGINFO */
43 GIT_COLOR_RED, /* OLD */
44 GIT_COLOR_GREEN, /* NEW */
45 GIT_COLOR_YELLOW, /* COMMIT */
46 GIT_COLOR_BG_RED, /* WHITESPACE */
47 GIT_COLOR_NORMAL, /* FUNCINFO */
48 };
49
50 static int parse_diff_color_slot(const char *var, int ofs)
51 {
52 if (!strcasecmp(var+ofs, "plain"))
53 return DIFF_PLAIN;
54 if (!strcasecmp(var+ofs, "meta"))
55 return DIFF_METAINFO;
56 if (!strcasecmp(var+ofs, "frag"))
57 return DIFF_FRAGINFO;
58 if (!strcasecmp(var+ofs, "old"))
59 return DIFF_FILE_OLD;
60 if (!strcasecmp(var+ofs, "new"))
61 return DIFF_FILE_NEW;
62 if (!strcasecmp(var+ofs, "commit"))
63 return DIFF_COMMIT;
64 if (!strcasecmp(var+ofs, "whitespace"))
65 return DIFF_WHITESPACE;
66 if (!strcasecmp(var+ofs, "func"))
67 return DIFF_FUNCINFO;
68 return -1;
69 }
70
71 static int parse_dirstat_params(struct diff_options *options, const char *params,
72 struct strbuf *errmsg)
73 {
74 const char *p = params;
75 int p_len, ret = 0;
76
77 while (*p) {
78 p_len = strchrnul(p, ',') - p;
79 if (!memcmp(p, "changes", p_len)) {
80 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
81 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
82 } else if (!memcmp(p, "lines", p_len)) {
83 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
84 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
85 } else if (!memcmp(p, "files", p_len)) {
86 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
87 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
88 } else if (!memcmp(p, "noncumulative", p_len)) {
89 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
90 } else if (!memcmp(p, "cumulative", p_len)) {
91 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
92 } else if (isdigit(*p)) {
93 char *end;
94 int permille = strtoul(p, &end, 10) * 10;
95 if (*end == '.' && isdigit(*++end)) {
96 /* only use first digit */
97 permille += *end - '0';
98 /* .. and ignore any further digits */
99 while (isdigit(*++end))
100 ; /* nothing */
101 }
102 if (end - p == p_len)
103 options->dirstat_permille = permille;
104 else {
105 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%.*s'\n"),
106 p_len, p);
107 ret++;
108 }
109 } else {
110 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%.*s'\n"),
111 p_len, p);
112 ret++;
113 }
114
115 p += p_len;
116
117 if (*p)
118 p++; /* more parameters, swallow separator */
119 }
120 return ret;
121 }
122
123 static int git_config_rename(const char *var, const char *value)
124 {
125 if (!value)
126 return DIFF_DETECT_RENAME;
127 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
128 return DIFF_DETECT_COPY;
129 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
130 }
131
132 /*
133 * These are to give UI layer defaults.
134 * The core-level commands such as git-diff-files should
135 * never be affected by the setting of diff.renames
136 * the user happens to have in the configuration file.
137 */
138 int git_diff_ui_config(const char *var, const char *value, void *cb)
139 {
140 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
141 diff_use_color_default = git_config_colorbool(var, value);
142 return 0;
143 }
144 if (!strcmp(var, "diff.renames")) {
145 diff_detect_rename_default = git_config_rename(var, value);
146 return 0;
147 }
148 if (!strcmp(var, "diff.autorefreshindex")) {
149 diff_auto_refresh_index = git_config_bool(var, value);
150 return 0;
151 }
152 if (!strcmp(var, "diff.mnemonicprefix")) {
153 diff_mnemonic_prefix = git_config_bool(var, value);
154 return 0;
155 }
156 if (!strcmp(var, "diff.noprefix")) {
157 diff_no_prefix = git_config_bool(var, value);
158 return 0;
159 }
160 if (!strcmp(var, "diff.statgraphwidth")) {
161 diff_stat_graph_width = git_config_int(var, value);
162 return 0;
163 }
164 if (!strcmp(var, "diff.external"))
165 return git_config_string(&external_diff_cmd_cfg, var, value);
166 if (!strcmp(var, "diff.wordregex"))
167 return git_config_string(&diff_word_regex_cfg, var, value);
168
169 if (!strcmp(var, "diff.ignoresubmodules"))
170 handle_ignore_submodules_arg(&default_diff_options, value);
171
172 if (git_color_config(var, value, cb) < 0)
173 return -1;
174
175 return git_diff_basic_config(var, value, cb);
176 }
177
178 int git_diff_basic_config(const char *var, const char *value, void *cb)
179 {
180 if (!strcmp(var, "diff.renamelimit")) {
181 diff_rename_limit_default = git_config_int(var, value);
182 return 0;
183 }
184
185 if (userdiff_config(var, value) < 0)
186 return -1;
187
188 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
189 int slot = parse_diff_color_slot(var, 11);
190 if (slot < 0)
191 return 0;
192 if (!value)
193 return config_error_nonbool(var);
194 color_parse(value, var, diff_colors[slot]);
195 return 0;
196 }
197
198 /* like GNU diff's --suppress-blank-empty option */
199 if (!strcmp(var, "diff.suppressblankempty") ||
200 /* for backwards compatibility */
201 !strcmp(var, "diff.suppress-blank-empty")) {
202 diff_suppress_blank_empty = git_config_bool(var, value);
203 return 0;
204 }
205
206 if (!strcmp(var, "diff.dirstat")) {
207 struct strbuf errmsg = STRBUF_INIT;
208 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
209 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
210 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
211 errmsg.buf);
212 strbuf_release(&errmsg);
213 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
214 return 0;
215 }
216
217 if (!prefixcmp(var, "submodule."))
218 return parse_submodule_config_option(var, value);
219
220 return git_default_config(var, value, cb);
221 }
222
223 static char *quote_two(const char *one, const char *two)
224 {
225 int need_one = quote_c_style(one, NULL, NULL, 1);
226 int need_two = quote_c_style(two, NULL, NULL, 1);
227 struct strbuf res = STRBUF_INIT;
228
229 if (need_one + need_two) {
230 strbuf_addch(&res, '"');
231 quote_c_style(one, &res, NULL, 1);
232 quote_c_style(two, &res, NULL, 1);
233 strbuf_addch(&res, '"');
234 } else {
235 strbuf_addstr(&res, one);
236 strbuf_addstr(&res, two);
237 }
238 return strbuf_detach(&res, NULL);
239 }
240
241 static const char *external_diff(void)
242 {
243 static const char *external_diff_cmd = NULL;
244 static int done_preparing = 0;
245
246 if (done_preparing)
247 return external_diff_cmd;
248 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
249 if (!external_diff_cmd)
250 external_diff_cmd = external_diff_cmd_cfg;
251 done_preparing = 1;
252 return external_diff_cmd;
253 }
254
255 static struct diff_tempfile {
256 const char *name; /* filename external diff should read from */
257 char hex[41];
258 char mode[10];
259 char tmp_path[PATH_MAX];
260 } diff_temp[2];
261
262 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
263
264 struct emit_callback {
265 int color_diff;
266 unsigned ws_rule;
267 int blank_at_eof_in_preimage;
268 int blank_at_eof_in_postimage;
269 int lno_in_preimage;
270 int lno_in_postimage;
271 sane_truncate_fn truncate;
272 const char **label_path;
273 struct diff_words_data *diff_words;
274 struct diff_options *opt;
275 int *found_changesp;
276 struct strbuf *header;
277 };
278
279 static int count_lines(const char *data, int size)
280 {
281 int count, ch, completely_empty = 1, nl_just_seen = 0;
282 count = 0;
283 while (0 < size--) {
284 ch = *data++;
285 if (ch == '\n') {
286 count++;
287 nl_just_seen = 1;
288 completely_empty = 0;
289 }
290 else {
291 nl_just_seen = 0;
292 completely_empty = 0;
293 }
294 }
295 if (completely_empty)
296 return 0;
297 if (!nl_just_seen)
298 count++; /* no trailing newline */
299 return count;
300 }
301
302 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
303 {
304 if (!DIFF_FILE_VALID(one)) {
305 mf->ptr = (char *)""; /* does not matter */
306 mf->size = 0;
307 return 0;
308 }
309 else if (diff_populate_filespec(one, 0))
310 return -1;
311
312 mf->ptr = one->data;
313 mf->size = one->size;
314 return 0;
315 }
316
317 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
318 static unsigned long diff_filespec_size(struct diff_filespec *one)
319 {
320 if (!DIFF_FILE_VALID(one))
321 return 0;
322 diff_populate_filespec(one, 1);
323 return one->size;
324 }
325
326 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
327 {
328 char *ptr = mf->ptr;
329 long size = mf->size;
330 int cnt = 0;
331
332 if (!size)
333 return cnt;
334 ptr += size - 1; /* pointing at the very end */
335 if (*ptr != '\n')
336 ; /* incomplete line */
337 else
338 ptr--; /* skip the last LF */
339 while (mf->ptr < ptr) {
340 char *prev_eol;
341 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
342 if (*prev_eol == '\n')
343 break;
344 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
345 break;
346 cnt++;
347 ptr = prev_eol - 1;
348 }
349 return cnt;
350 }
351
352 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
353 struct emit_callback *ecbdata)
354 {
355 int l1, l2, at;
356 unsigned ws_rule = ecbdata->ws_rule;
357 l1 = count_trailing_blank(mf1, ws_rule);
358 l2 = count_trailing_blank(mf2, ws_rule);
359 if (l2 <= l1) {
360 ecbdata->blank_at_eof_in_preimage = 0;
361 ecbdata->blank_at_eof_in_postimage = 0;
362 return;
363 }
364 at = count_lines(mf1->ptr, mf1->size);
365 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
366
367 at = count_lines(mf2->ptr, mf2->size);
368 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
369 }
370
371 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
372 int first, const char *line, int len)
373 {
374 int has_trailing_newline, has_trailing_carriage_return;
375 int nofirst;
376 FILE *file = o->file;
377
378 if (o->output_prefix) {
379 struct strbuf *msg = NULL;
380 msg = o->output_prefix(o, o->output_prefix_data);
381 assert(msg);
382 fwrite(msg->buf, msg->len, 1, file);
383 }
384
385 if (len == 0) {
386 has_trailing_newline = (first == '\n');
387 has_trailing_carriage_return = (!has_trailing_newline &&
388 (first == '\r'));
389 nofirst = has_trailing_newline || has_trailing_carriage_return;
390 } else {
391 has_trailing_newline = (len > 0 && line[len-1] == '\n');
392 if (has_trailing_newline)
393 len--;
394 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
395 if (has_trailing_carriage_return)
396 len--;
397 nofirst = 0;
398 }
399
400 if (len || !nofirst) {
401 fputs(set, file);
402 if (!nofirst)
403 fputc(first, file);
404 fwrite(line, len, 1, file);
405 fputs(reset, file);
406 }
407 if (has_trailing_carriage_return)
408 fputc('\r', file);
409 if (has_trailing_newline)
410 fputc('\n', file);
411 }
412
413 static void emit_line(struct diff_options *o, const char *set, const char *reset,
414 const char *line, int len)
415 {
416 emit_line_0(o, set, reset, line[0], line+1, len-1);
417 }
418
419 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
420 {
421 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
422 ecbdata->blank_at_eof_in_preimage &&
423 ecbdata->blank_at_eof_in_postimage &&
424 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
425 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
426 return 0;
427 return ws_blank_line(line, len, ecbdata->ws_rule);
428 }
429
430 static void emit_add_line(const char *reset,
431 struct emit_callback *ecbdata,
432 const char *line, int len)
433 {
434 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
435 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
436
437 if (!*ws)
438 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
439 else if (new_blank_line_at_eof(ecbdata, line, len))
440 /* Blank line at EOF - paint '+' as well */
441 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
442 else {
443 /* Emit just the prefix, then the rest. */
444 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
445 ws_check_emit(line, len, ecbdata->ws_rule,
446 ecbdata->opt->file, set, reset, ws);
447 }
448 }
449
450 static void emit_hunk_header(struct emit_callback *ecbdata,
451 const char *line, int len)
452 {
453 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
454 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
455 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
456 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
457 static const char atat[2] = { '@', '@' };
458 const char *cp, *ep;
459 struct strbuf msgbuf = STRBUF_INIT;
460 int org_len = len;
461 int i = 1;
462
463 /*
464 * As a hunk header must begin with "@@ -<old>, +<new> @@",
465 * it always is at least 10 bytes long.
466 */
467 if (len < 10 ||
468 memcmp(line, atat, 2) ||
469 !(ep = memmem(line + 2, len - 2, atat, 2))) {
470 emit_line(ecbdata->opt, plain, reset, line, len);
471 return;
472 }
473 ep += 2; /* skip over @@ */
474
475 /* The hunk header in fraginfo color */
476 strbuf_add(&msgbuf, frag, strlen(frag));
477 strbuf_add(&msgbuf, line, ep - line);
478 strbuf_add(&msgbuf, reset, strlen(reset));
479
480 /*
481 * trailing "\r\n"
482 */
483 for ( ; i < 3; i++)
484 if (line[len - i] == '\r' || line[len - i] == '\n')
485 len--;
486
487 /* blank before the func header */
488 for (cp = ep; ep - line < len; ep++)
489 if (*ep != ' ' && *ep != '\t')
490 break;
491 if (ep != cp) {
492 strbuf_add(&msgbuf, plain, strlen(plain));
493 strbuf_add(&msgbuf, cp, ep - cp);
494 strbuf_add(&msgbuf, reset, strlen(reset));
495 }
496
497 if (ep < line + len) {
498 strbuf_add(&msgbuf, func, strlen(func));
499 strbuf_add(&msgbuf, ep, line + len - ep);
500 strbuf_add(&msgbuf, reset, strlen(reset));
501 }
502
503 strbuf_add(&msgbuf, line + len, org_len - len);
504 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
505 strbuf_release(&msgbuf);
506 }
507
508 static struct diff_tempfile *claim_diff_tempfile(void) {
509 int i;
510 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
511 if (!diff_temp[i].name)
512 return diff_temp + i;
513 die("BUG: diff is failing to clean up its tempfiles");
514 }
515
516 static int remove_tempfile_installed;
517
518 static void remove_tempfile(void)
519 {
520 int i;
521 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
522 if (diff_temp[i].name == diff_temp[i].tmp_path)
523 unlink_or_warn(diff_temp[i].name);
524 diff_temp[i].name = NULL;
525 }
526 }
527
528 static void remove_tempfile_on_signal(int signo)
529 {
530 remove_tempfile();
531 sigchain_pop(signo);
532 raise(signo);
533 }
534
535 static void print_line_count(FILE *file, int count)
536 {
537 switch (count) {
538 case 0:
539 fprintf(file, "0,0");
540 break;
541 case 1:
542 fprintf(file, "1");
543 break;
544 default:
545 fprintf(file, "1,%d", count);
546 break;
547 }
548 }
549
550 static void emit_rewrite_lines(struct emit_callback *ecb,
551 int prefix, const char *data, int size)
552 {
553 const char *endp = NULL;
554 static const char *nneof = " No newline at end of file\n";
555 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
556 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
557
558 while (0 < size) {
559 int len;
560
561 endp = memchr(data, '\n', size);
562 len = endp ? (endp - data + 1) : size;
563 if (prefix != '+') {
564 ecb->lno_in_preimage++;
565 emit_line_0(ecb->opt, old, reset, '-',
566 data, len);
567 } else {
568 ecb->lno_in_postimage++;
569 emit_add_line(reset, ecb, data, len);
570 }
571 size -= len;
572 data += len;
573 }
574 if (!endp) {
575 const char *plain = diff_get_color(ecb->color_diff,
576 DIFF_PLAIN);
577 putc('\n', ecb->opt->file);
578 emit_line_0(ecb->opt, plain, reset, '\\',
579 nneof, strlen(nneof));
580 }
581 }
582
583 static void emit_rewrite_diff(const char *name_a,
584 const char *name_b,
585 struct diff_filespec *one,
586 struct diff_filespec *two,
587 struct userdiff_driver *textconv_one,
588 struct userdiff_driver *textconv_two,
589 struct diff_options *o)
590 {
591 int lc_a, lc_b;
592 const char *name_a_tab, *name_b_tab;
593 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
594 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
595 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
596 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
597 const char *a_prefix, *b_prefix;
598 char *data_one, *data_two;
599 size_t size_one, size_two;
600 struct emit_callback ecbdata;
601 char *line_prefix = "";
602 struct strbuf *msgbuf;
603
604 if (o && o->output_prefix) {
605 msgbuf = o->output_prefix(o, o->output_prefix_data);
606 line_prefix = msgbuf->buf;
607 }
608
609 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
610 a_prefix = o->b_prefix;
611 b_prefix = o->a_prefix;
612 } else {
613 a_prefix = o->a_prefix;
614 b_prefix = o->b_prefix;
615 }
616
617 name_a += (*name_a == '/');
618 name_b += (*name_b == '/');
619 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
620 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
621
622 strbuf_reset(&a_name);
623 strbuf_reset(&b_name);
624 quote_two_c_style(&a_name, a_prefix, name_a, 0);
625 quote_two_c_style(&b_name, b_prefix, name_b, 0);
626
627 size_one = fill_textconv(textconv_one, one, &data_one);
628 size_two = fill_textconv(textconv_two, two, &data_two);
629
630 memset(&ecbdata, 0, sizeof(ecbdata));
631 ecbdata.color_diff = want_color(o->use_color);
632 ecbdata.found_changesp = &o->found_changes;
633 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
634 ecbdata.opt = o;
635 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
636 mmfile_t mf1, mf2;
637 mf1.ptr = (char *)data_one;
638 mf2.ptr = (char *)data_two;
639 mf1.size = size_one;
640 mf2.size = size_two;
641 check_blank_at_eof(&mf1, &mf2, &ecbdata);
642 }
643 ecbdata.lno_in_preimage = 1;
644 ecbdata.lno_in_postimage = 1;
645
646 lc_a = count_lines(data_one, size_one);
647 lc_b = count_lines(data_two, size_two);
648 fprintf(o->file,
649 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
650 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
651 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
652 line_prefix, fraginfo);
653 if (!o->irreversible_delete)
654 print_line_count(o->file, lc_a);
655 else
656 fprintf(o->file, "?,?");
657 fprintf(o->file, " +");
658 print_line_count(o->file, lc_b);
659 fprintf(o->file, " @@%s\n", reset);
660 if (lc_a && !o->irreversible_delete)
661 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
662 if (lc_b)
663 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
664 if (textconv_one)
665 free((char *)data_one);
666 if (textconv_two)
667 free((char *)data_two);
668 }
669
670 struct diff_words_buffer {
671 mmfile_t text;
672 long alloc;
673 struct diff_words_orig {
674 const char *begin, *end;
675 } *orig;
676 int orig_nr, orig_alloc;
677 };
678
679 static void diff_words_append(char *line, unsigned long len,
680 struct diff_words_buffer *buffer)
681 {
682 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
683 line++;
684 len--;
685 memcpy(buffer->text.ptr + buffer->text.size, line, len);
686 buffer->text.size += len;
687 buffer->text.ptr[buffer->text.size] = '\0';
688 }
689
690 struct diff_words_style_elem {
691 const char *prefix;
692 const char *suffix;
693 const char *color; /* NULL; filled in by the setup code if
694 * color is enabled */
695 };
696
697 struct diff_words_style {
698 enum diff_words_type type;
699 struct diff_words_style_elem new, old, ctx;
700 const char *newline;
701 };
702
703 static struct diff_words_style diff_words_styles[] = {
704 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
705 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
706 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
707 };
708
709 struct diff_words_data {
710 struct diff_words_buffer minus, plus;
711 const char *current_plus;
712 int last_minus;
713 struct diff_options *opt;
714 regex_t *word_regex;
715 enum diff_words_type type;
716 struct diff_words_style *style;
717 };
718
719 static int fn_out_diff_words_write_helper(FILE *fp,
720 struct diff_words_style_elem *st_el,
721 const char *newline,
722 size_t count, const char *buf,
723 const char *line_prefix)
724 {
725 int print = 0;
726
727 while (count) {
728 char *p = memchr(buf, '\n', count);
729 if (print)
730 fputs(line_prefix, fp);
731 if (p != buf) {
732 if (st_el->color && fputs(st_el->color, fp) < 0)
733 return -1;
734 if (fputs(st_el->prefix, fp) < 0 ||
735 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
736 fputs(st_el->suffix, fp) < 0)
737 return -1;
738 if (st_el->color && *st_el->color
739 && fputs(GIT_COLOR_RESET, fp) < 0)
740 return -1;
741 }
742 if (!p)
743 return 0;
744 if (fputs(newline, fp) < 0)
745 return -1;
746 count -= p + 1 - buf;
747 buf = p + 1;
748 print = 1;
749 }
750 return 0;
751 }
752
753 /*
754 * '--color-words' algorithm can be described as:
755 *
756 * 1. collect a the minus/plus lines of a diff hunk, divided into
757 * minus-lines and plus-lines;
758 *
759 * 2. break both minus-lines and plus-lines into words and
760 * place them into two mmfile_t with one word for each line;
761 *
762 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
763 *
764 * And for the common parts of the both file, we output the plus side text.
765 * diff_words->current_plus is used to trace the current position of the plus file
766 * which printed. diff_words->last_minus is used to trace the last minus word
767 * printed.
768 *
769 * For '--graph' to work with '--color-words', we need to output the graph prefix
770 * on each line of color words output. Generally, there are two conditions on
771 * which we should output the prefix.
772 *
773 * 1. diff_words->last_minus == 0 &&
774 * diff_words->current_plus == diff_words->plus.text.ptr
775 *
776 * that is: the plus text must start as a new line, and if there is no minus
777 * word printed, a graph prefix must be printed.
778 *
779 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
780 * *(diff_words->current_plus - 1) == '\n'
781 *
782 * that is: a graph prefix must be printed following a '\n'
783 */
784 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
785 {
786 if ((diff_words->last_minus == 0 &&
787 diff_words->current_plus == diff_words->plus.text.ptr) ||
788 (diff_words->current_plus > diff_words->plus.text.ptr &&
789 *(diff_words->current_plus - 1) == '\n')) {
790 return 1;
791 } else {
792 return 0;
793 }
794 }
795
796 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
797 {
798 struct diff_words_data *diff_words = priv;
799 struct diff_words_style *style = diff_words->style;
800 int minus_first, minus_len, plus_first, plus_len;
801 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
802 struct diff_options *opt = diff_words->opt;
803 struct strbuf *msgbuf;
804 char *line_prefix = "";
805
806 if (line[0] != '@' || parse_hunk_header(line, len,
807 &minus_first, &minus_len, &plus_first, &plus_len))
808 return;
809
810 assert(opt);
811 if (opt->output_prefix) {
812 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
813 line_prefix = msgbuf->buf;
814 }
815
816 /* POSIX requires that first be decremented by one if len == 0... */
817 if (minus_len) {
818 minus_begin = diff_words->minus.orig[minus_first].begin;
819 minus_end =
820 diff_words->minus.orig[minus_first + minus_len - 1].end;
821 } else
822 minus_begin = minus_end =
823 diff_words->minus.orig[minus_first].end;
824
825 if (plus_len) {
826 plus_begin = diff_words->plus.orig[plus_first].begin;
827 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
828 } else
829 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
830
831 if (color_words_output_graph_prefix(diff_words)) {
832 fputs(line_prefix, diff_words->opt->file);
833 }
834 if (diff_words->current_plus != plus_begin) {
835 fn_out_diff_words_write_helper(diff_words->opt->file,
836 &style->ctx, style->newline,
837 plus_begin - diff_words->current_plus,
838 diff_words->current_plus, line_prefix);
839 if (*(plus_begin - 1) == '\n')
840 fputs(line_prefix, diff_words->opt->file);
841 }
842 if (minus_begin != minus_end) {
843 fn_out_diff_words_write_helper(diff_words->opt->file,
844 &style->old, style->newline,
845 minus_end - minus_begin, minus_begin,
846 line_prefix);
847 }
848 if (plus_begin != plus_end) {
849 fn_out_diff_words_write_helper(diff_words->opt->file,
850 &style->new, style->newline,
851 plus_end - plus_begin, plus_begin,
852 line_prefix);
853 }
854
855 diff_words->current_plus = plus_end;
856 diff_words->last_minus = minus_first;
857 }
858
859 /* This function starts looking at *begin, and returns 0 iff a word was found. */
860 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
861 int *begin, int *end)
862 {
863 if (word_regex && *begin < buffer->size) {
864 regmatch_t match[1];
865 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
866 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
867 '\n', match[0].rm_eo - match[0].rm_so);
868 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
869 *begin += match[0].rm_so;
870 return *begin >= *end;
871 }
872 return -1;
873 }
874
875 /* find the next word */
876 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
877 (*begin)++;
878 if (*begin >= buffer->size)
879 return -1;
880
881 /* find the end of the word */
882 *end = *begin + 1;
883 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
884 (*end)++;
885
886 return 0;
887 }
888
889 /*
890 * This function splits the words in buffer->text, stores the list with
891 * newline separator into out, and saves the offsets of the original words
892 * in buffer->orig.
893 */
894 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
895 regex_t *word_regex)
896 {
897 int i, j;
898 long alloc = 0;
899
900 out->size = 0;
901 out->ptr = NULL;
902
903 /* fake an empty "0th" word */
904 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
905 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
906 buffer->orig_nr = 1;
907
908 for (i = 0; i < buffer->text.size; i++) {
909 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
910 return;
911
912 /* store original boundaries */
913 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
914 buffer->orig_alloc);
915 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
916 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
917 buffer->orig_nr++;
918
919 /* store one word */
920 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
921 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
922 out->ptr[out->size + j - i] = '\n';
923 out->size += j - i + 1;
924
925 i = j - 1;
926 }
927 }
928
929 /* this executes the word diff on the accumulated buffers */
930 static void diff_words_show(struct diff_words_data *diff_words)
931 {
932 xpparam_t xpp;
933 xdemitconf_t xecfg;
934 mmfile_t minus, plus;
935 struct diff_words_style *style = diff_words->style;
936
937 struct diff_options *opt = diff_words->opt;
938 struct strbuf *msgbuf;
939 char *line_prefix = "";
940
941 assert(opt);
942 if (opt->output_prefix) {
943 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
944 line_prefix = msgbuf->buf;
945 }
946
947 /* special case: only removal */
948 if (!diff_words->plus.text.size) {
949 fputs(line_prefix, diff_words->opt->file);
950 fn_out_diff_words_write_helper(diff_words->opt->file,
951 &style->old, style->newline,
952 diff_words->minus.text.size,
953 diff_words->minus.text.ptr, line_prefix);
954 diff_words->minus.text.size = 0;
955 return;
956 }
957
958 diff_words->current_plus = diff_words->plus.text.ptr;
959 diff_words->last_minus = 0;
960
961 memset(&xpp, 0, sizeof(xpp));
962 memset(&xecfg, 0, sizeof(xecfg));
963 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
964 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
965 xpp.flags = 0;
966 /* as only the hunk header will be parsed, we need a 0-context */
967 xecfg.ctxlen = 0;
968 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
969 &xpp, &xecfg);
970 free(minus.ptr);
971 free(plus.ptr);
972 if (diff_words->current_plus != diff_words->plus.text.ptr +
973 diff_words->plus.text.size) {
974 if (color_words_output_graph_prefix(diff_words))
975 fputs(line_prefix, diff_words->opt->file);
976 fn_out_diff_words_write_helper(diff_words->opt->file,
977 &style->ctx, style->newline,
978 diff_words->plus.text.ptr + diff_words->plus.text.size
979 - diff_words->current_plus, diff_words->current_plus,
980 line_prefix);
981 }
982 diff_words->minus.text.size = diff_words->plus.text.size = 0;
983 }
984
985 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
986 static void diff_words_flush(struct emit_callback *ecbdata)
987 {
988 if (ecbdata->diff_words->minus.text.size ||
989 ecbdata->diff_words->plus.text.size)
990 diff_words_show(ecbdata->diff_words);
991 }
992
993 static void diff_filespec_load_driver(struct diff_filespec *one)
994 {
995 /* Use already-loaded driver */
996 if (one->driver)
997 return;
998
999 if (S_ISREG(one->mode))
1000 one->driver = userdiff_find_by_path(one->path);
1001
1002 /* Fallback to default settings */
1003 if (!one->driver)
1004 one->driver = userdiff_find_by_name("default");
1005 }
1006
1007 static const char *userdiff_word_regex(struct diff_filespec *one)
1008 {
1009 diff_filespec_load_driver(one);
1010 return one->driver->word_regex;
1011 }
1012
1013 static void init_diff_words_data(struct emit_callback *ecbdata,
1014 struct diff_options *orig_opts,
1015 struct diff_filespec *one,
1016 struct diff_filespec *two)
1017 {
1018 int i;
1019 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1020 memcpy(o, orig_opts, sizeof(struct diff_options));
1021
1022 ecbdata->diff_words =
1023 xcalloc(1, sizeof(struct diff_words_data));
1024 ecbdata->diff_words->type = o->word_diff;
1025 ecbdata->diff_words->opt = o;
1026 if (!o->word_regex)
1027 o->word_regex = userdiff_word_regex(one);
1028 if (!o->word_regex)
1029 o->word_regex = userdiff_word_regex(two);
1030 if (!o->word_regex)
1031 o->word_regex = diff_word_regex_cfg;
1032 if (o->word_regex) {
1033 ecbdata->diff_words->word_regex = (regex_t *)
1034 xmalloc(sizeof(regex_t));
1035 if (regcomp(ecbdata->diff_words->word_regex,
1036 o->word_regex,
1037 REG_EXTENDED | REG_NEWLINE))
1038 die ("Invalid regular expression: %s",
1039 o->word_regex);
1040 }
1041 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1042 if (o->word_diff == diff_words_styles[i].type) {
1043 ecbdata->diff_words->style =
1044 &diff_words_styles[i];
1045 break;
1046 }
1047 }
1048 if (want_color(o->use_color)) {
1049 struct diff_words_style *st = ecbdata->diff_words->style;
1050 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1051 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1052 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1053 }
1054 }
1055
1056 static void free_diff_words_data(struct emit_callback *ecbdata)
1057 {
1058 if (ecbdata->diff_words) {
1059 diff_words_flush(ecbdata);
1060 free (ecbdata->diff_words->opt);
1061 free (ecbdata->diff_words->minus.text.ptr);
1062 free (ecbdata->diff_words->minus.orig);
1063 free (ecbdata->diff_words->plus.text.ptr);
1064 free (ecbdata->diff_words->plus.orig);
1065 if (ecbdata->diff_words->word_regex) {
1066 regfree(ecbdata->diff_words->word_regex);
1067 free(ecbdata->diff_words->word_regex);
1068 }
1069 free(ecbdata->diff_words);
1070 ecbdata->diff_words = NULL;
1071 }
1072 }
1073
1074 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1075 {
1076 if (want_color(diff_use_color))
1077 return diff_colors[ix];
1078 return "";
1079 }
1080
1081 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1082 {
1083 const char *cp;
1084 unsigned long allot;
1085 size_t l = len;
1086
1087 if (ecb->truncate)
1088 return ecb->truncate(line, len);
1089 cp = line;
1090 allot = l;
1091 while (0 < l) {
1092 (void) utf8_width(&cp, &l);
1093 if (!cp)
1094 break; /* truncated in the middle? */
1095 }
1096 return allot - l;
1097 }
1098
1099 static void find_lno(const char *line, struct emit_callback *ecbdata)
1100 {
1101 const char *p;
1102 ecbdata->lno_in_preimage = 0;
1103 ecbdata->lno_in_postimage = 0;
1104 p = strchr(line, '-');
1105 if (!p)
1106 return; /* cannot happen */
1107 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1108 p = strchr(p, '+');
1109 if (!p)
1110 return; /* cannot happen */
1111 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1112 }
1113
1114 static void fn_out_consume(void *priv, char *line, unsigned long len)
1115 {
1116 struct emit_callback *ecbdata = priv;
1117 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1118 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1119 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1120 struct diff_options *o = ecbdata->opt;
1121 char *line_prefix = "";
1122 struct strbuf *msgbuf;
1123
1124 if (o && o->output_prefix) {
1125 msgbuf = o->output_prefix(o, o->output_prefix_data);
1126 line_prefix = msgbuf->buf;
1127 }
1128
1129 if (ecbdata->header) {
1130 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1131 strbuf_reset(ecbdata->header);
1132 ecbdata->header = NULL;
1133 }
1134 *(ecbdata->found_changesp) = 1;
1135
1136 if (ecbdata->label_path[0]) {
1137 const char *name_a_tab, *name_b_tab;
1138
1139 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1140 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1141
1142 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1143 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1144 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1145 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1146 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1147 }
1148
1149 if (diff_suppress_blank_empty
1150 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1151 line[0] = '\n';
1152 len = 1;
1153 }
1154
1155 if (line[0] == '@') {
1156 if (ecbdata->diff_words)
1157 diff_words_flush(ecbdata);
1158 len = sane_truncate_line(ecbdata, line, len);
1159 find_lno(line, ecbdata);
1160 emit_hunk_header(ecbdata, line, len);
1161 if (line[len-1] != '\n')
1162 putc('\n', ecbdata->opt->file);
1163 return;
1164 }
1165
1166 if (len < 1) {
1167 emit_line(ecbdata->opt, reset, reset, line, len);
1168 if (ecbdata->diff_words
1169 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1170 fputs("~\n", ecbdata->opt->file);
1171 return;
1172 }
1173
1174 if (ecbdata->diff_words) {
1175 if (line[0] == '-') {
1176 diff_words_append(line, len,
1177 &ecbdata->diff_words->minus);
1178 return;
1179 } else if (line[0] == '+') {
1180 diff_words_append(line, len,
1181 &ecbdata->diff_words->plus);
1182 return;
1183 } else if (!prefixcmp(line, "\\ ")) {
1184 /*
1185 * Eat the "no newline at eof" marker as if we
1186 * saw a "+" or "-" line with nothing on it,
1187 * and return without diff_words_flush() to
1188 * defer processing. If this is the end of
1189 * preimage, more "+" lines may come after it.
1190 */
1191 return;
1192 }
1193 diff_words_flush(ecbdata);
1194 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1195 emit_line(ecbdata->opt, plain, reset, line, len);
1196 fputs("~\n", ecbdata->opt->file);
1197 } else {
1198 /*
1199 * Skip the prefix character, if any. With
1200 * diff_suppress_blank_empty, there may be
1201 * none.
1202 */
1203 if (line[0] != '\n') {
1204 line++;
1205 len--;
1206 }
1207 emit_line(ecbdata->opt, plain, reset, line, len);
1208 }
1209 return;
1210 }
1211
1212 if (line[0] != '+') {
1213 const char *color =
1214 diff_get_color(ecbdata->color_diff,
1215 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1216 ecbdata->lno_in_preimage++;
1217 if (line[0] == ' ')
1218 ecbdata->lno_in_postimage++;
1219 emit_line(ecbdata->opt, color, reset, line, len);
1220 } else {
1221 ecbdata->lno_in_postimage++;
1222 emit_add_line(reset, ecbdata, line + 1, len - 1);
1223 }
1224 }
1225
1226 static char *pprint_rename(const char *a, const char *b)
1227 {
1228 const char *old = a;
1229 const char *new = b;
1230 struct strbuf name = STRBUF_INIT;
1231 int pfx_length, sfx_length;
1232 int len_a = strlen(a);
1233 int len_b = strlen(b);
1234 int a_midlen, b_midlen;
1235 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1236 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1237
1238 if (qlen_a || qlen_b) {
1239 quote_c_style(a, &name, NULL, 0);
1240 strbuf_addstr(&name, " => ");
1241 quote_c_style(b, &name, NULL, 0);
1242 return strbuf_detach(&name, NULL);
1243 }
1244
1245 /* Find common prefix */
1246 pfx_length = 0;
1247 while (*old && *new && *old == *new) {
1248 if (*old == '/')
1249 pfx_length = old - a + 1;
1250 old++;
1251 new++;
1252 }
1253
1254 /* Find common suffix */
1255 old = a + len_a;
1256 new = b + len_b;
1257 sfx_length = 0;
1258 while (a <= old && b <= new && *old == *new) {
1259 if (*old == '/')
1260 sfx_length = len_a - (old - a);
1261 old--;
1262 new--;
1263 }
1264
1265 /*
1266 * pfx{mid-a => mid-b}sfx
1267 * {pfx-a => pfx-b}sfx
1268 * pfx{sfx-a => sfx-b}
1269 * name-a => name-b
1270 */
1271 a_midlen = len_a - pfx_length - sfx_length;
1272 b_midlen = len_b - pfx_length - sfx_length;
1273 if (a_midlen < 0)
1274 a_midlen = 0;
1275 if (b_midlen < 0)
1276 b_midlen = 0;
1277
1278 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1279 if (pfx_length + sfx_length) {
1280 strbuf_add(&name, a, pfx_length);
1281 strbuf_addch(&name, '{');
1282 }
1283 strbuf_add(&name, a + pfx_length, a_midlen);
1284 strbuf_addstr(&name, " => ");
1285 strbuf_add(&name, b + pfx_length, b_midlen);
1286 if (pfx_length + sfx_length) {
1287 strbuf_addch(&name, '}');
1288 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1289 }
1290 return strbuf_detach(&name, NULL);
1291 }
1292
1293 struct diffstat_t {
1294 int nr;
1295 int alloc;
1296 struct diffstat_file {
1297 char *from_name;
1298 char *name;
1299 char *print_name;
1300 unsigned is_unmerged:1;
1301 unsigned is_binary:1;
1302 unsigned is_renamed:1;
1303 unsigned is_interesting:1;
1304 uintmax_t added, deleted;
1305 } **files;
1306 };
1307
1308 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1309 const char *name_a,
1310 const char *name_b)
1311 {
1312 struct diffstat_file *x;
1313 x = xcalloc(sizeof (*x), 1);
1314 if (diffstat->nr == diffstat->alloc) {
1315 diffstat->alloc = alloc_nr(diffstat->alloc);
1316 diffstat->files = xrealloc(diffstat->files,
1317 diffstat->alloc * sizeof(x));
1318 }
1319 diffstat->files[diffstat->nr++] = x;
1320 if (name_b) {
1321 x->from_name = xstrdup(name_a);
1322 x->name = xstrdup(name_b);
1323 x->is_renamed = 1;
1324 }
1325 else {
1326 x->from_name = NULL;
1327 x->name = xstrdup(name_a);
1328 }
1329 return x;
1330 }
1331
1332 static void diffstat_consume(void *priv, char *line, unsigned long len)
1333 {
1334 struct diffstat_t *diffstat = priv;
1335 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1336
1337 if (line[0] == '+')
1338 x->added++;
1339 else if (line[0] == '-')
1340 x->deleted++;
1341 }
1342
1343 const char mime_boundary_leader[] = "------------";
1344
1345 static int scale_linear(int it, int width, int max_change)
1346 {
1347 if (!it)
1348 return 0;
1349 /*
1350 * make sure that at least one '-' or '+' is printed if
1351 * there is any change to this path. The easiest way is to
1352 * scale linearly as if the alloted width is one column shorter
1353 * than it is, and then add 1 to the result.
1354 */
1355 return 1 + (it * (width - 1) / max_change);
1356 }
1357
1358 static void show_name(FILE *file,
1359 const char *prefix, const char *name, int len)
1360 {
1361 fprintf(file, " %s%-*s |", prefix, len, name);
1362 }
1363
1364 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1365 {
1366 if (cnt <= 0)
1367 return;
1368 fprintf(file, "%s", set);
1369 while (cnt--)
1370 putc(ch, file);
1371 fprintf(file, "%s", reset);
1372 }
1373
1374 static void fill_print_name(struct diffstat_file *file)
1375 {
1376 char *pname;
1377
1378 if (file->print_name)
1379 return;
1380
1381 if (!file->is_renamed) {
1382 struct strbuf buf = STRBUF_INIT;
1383 if (quote_c_style(file->name, &buf, NULL, 0)) {
1384 pname = strbuf_detach(&buf, NULL);
1385 } else {
1386 pname = file->name;
1387 strbuf_release(&buf);
1388 }
1389 } else {
1390 pname = pprint_rename(file->from_name, file->name);
1391 }
1392 file->print_name = pname;
1393 }
1394
1395 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1396 {
1397 struct strbuf sb = STRBUF_INIT;
1398 int ret;
1399
1400 if (!files) {
1401 assert(insertions == 0 && deletions == 0);
1402 return fprintf(fp, "%s\n", " 0 files changed");
1403 }
1404
1405 strbuf_addf(&sb,
1406 (files == 1) ? " %d file changed" : " %d files changed",
1407 files);
1408
1409 /*
1410 * For binary diff, the caller may want to print "x files
1411 * changed" with insertions == 0 && deletions == 0.
1412 *
1413 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1414 * is probably less confusing (i.e skip over "2 files changed
1415 * but nothing about added/removed lines? Is this a bug in Git?").
1416 */
1417 if (insertions || deletions == 0) {
1418 /*
1419 * TRANSLATORS: "+" in (+) is a line addition marker;
1420 * do not translate it.
1421 */
1422 strbuf_addf(&sb,
1423 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1424 insertions);
1425 }
1426
1427 if (deletions || insertions == 0) {
1428 /*
1429 * TRANSLATORS: "-" in (-) is a line removal marker;
1430 * do not translate it.
1431 */
1432 strbuf_addf(&sb,
1433 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1434 deletions);
1435 }
1436 strbuf_addch(&sb, '\n');
1437 ret = fputs(sb.buf, fp);
1438 strbuf_release(&sb);
1439 return ret;
1440 }
1441
1442 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1443 {
1444 int i, len, add, del, adds = 0, dels = 0;
1445 uintmax_t max_change = 0, max_len = 0;
1446 int total_files = data->nr, count;
1447 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1448 const char *reset, *add_c, *del_c;
1449 const char *line_prefix = "";
1450 int extra_shown = 0;
1451 struct strbuf *msg = NULL;
1452
1453 if (data->nr == 0)
1454 return;
1455
1456 if (options->output_prefix) {
1457 msg = options->output_prefix(options, options->output_prefix_data);
1458 line_prefix = msg->buf;
1459 }
1460
1461 count = options->stat_count ? options->stat_count : data->nr;
1462
1463 reset = diff_get_color_opt(options, DIFF_RESET);
1464 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1465 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1466
1467 /*
1468 * Find the longest filename and max number of changes
1469 */
1470 for (i = 0; (i < count) && (i < data->nr); i++) {
1471 struct diffstat_file *file = data->files[i];
1472 uintmax_t change = file->added + file->deleted;
1473
1474 if (!file->is_interesting && (change == 0)) {
1475 count++; /* not shown == room for one more */
1476 continue;
1477 }
1478 fill_print_name(file);
1479 len = strlen(file->print_name);
1480 if (max_len < len)
1481 max_len = len;
1482
1483 if (file->is_unmerged) {
1484 /* "Unmerged" is 8 characters */
1485 bin_width = bin_width < 8 ? 8 : bin_width;
1486 continue;
1487 }
1488 if (file->is_binary) {
1489 /* "Bin XXX -> YYY bytes" */
1490 int w = 14 + decimal_width(file->added)
1491 + decimal_width(file->deleted);
1492 bin_width = bin_width < w ? w : bin_width;
1493 /* Display change counts aligned with "Bin" */
1494 number_width = 3;
1495 continue;
1496 }
1497
1498 if (max_change < change)
1499 max_change = change;
1500 }
1501 count = i; /* where we can stop scanning in data->files[] */
1502
1503 /*
1504 * We have width = stat_width or term_columns() columns total.
1505 * We want a maximum of min(max_len, stat_name_width) for the name part.
1506 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1507 * We also need 1 for " " and 4 + decimal_width(max_change)
1508 * for " | NNNN " and one the empty column at the end, altogether
1509 * 6 + decimal_width(max_change).
1510 *
1511 * If there's not enough space, we will use the smaller of
1512 * stat_name_width (if set) and 5/8*width for the filename,
1513 * and the rest for constant elements + graph part, but no more
1514 * than stat_graph_width for the graph part.
1515 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1516 * for the standard terminal size).
1517 *
1518 * In other words: stat_width limits the maximum width, and
1519 * stat_name_width fixes the maximum width of the filename,
1520 * and is also used to divide available columns if there
1521 * aren't enough.
1522 *
1523 * Binary files are displayed with "Bin XXX -> YYY bytes"
1524 * instead of the change count and graph. This part is treated
1525 * similarly to the graph part, except that it is not
1526 * "scaled". If total width is too small to accomodate the
1527 * guaranteed minimum width of the filename part and the
1528 * separators and this message, this message will "overflow"
1529 * making the line longer than the maximum width.
1530 */
1531
1532 if (options->stat_width == -1)
1533 width = term_columns() - options->output_prefix_length;
1534 else
1535 width = options->stat_width ? options->stat_width : 80;
1536 number_width = decimal_width(max_change) > number_width ?
1537 decimal_width(max_change) : number_width;
1538
1539 if (options->stat_graph_width == -1)
1540 options->stat_graph_width = diff_stat_graph_width;
1541
1542 /*
1543 * Guarantee 3/8*16==6 for the graph part
1544 * and 5/8*16==10 for the filename part
1545 */
1546 if (width < 16 + 6 + number_width)
1547 width = 16 + 6 + number_width;
1548
1549 /*
1550 * First assign sizes that are wanted, ignoring available width.
1551 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1552 * starting from "XXX" should fit in graph_width.
1553 */
1554 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1555 if (options->stat_graph_width &&
1556 options->stat_graph_width < graph_width)
1557 graph_width = options->stat_graph_width;
1558
1559 name_width = (options->stat_name_width > 0 &&
1560 options->stat_name_width < max_len) ?
1561 options->stat_name_width : max_len;
1562
1563 /*
1564 * Adjust adjustable widths not to exceed maximum width
1565 */
1566 if (name_width + number_width + 6 + graph_width > width) {
1567 if (graph_width > width * 3/8 - number_width - 6) {
1568 graph_width = width * 3/8 - number_width - 6;
1569 if (graph_width < 6)
1570 graph_width = 6;
1571 }
1572
1573 if (options->stat_graph_width &&
1574 graph_width > options->stat_graph_width)
1575 graph_width = options->stat_graph_width;
1576 if (name_width > width - number_width - 6 - graph_width)
1577 name_width = width - number_width - 6 - graph_width;
1578 else
1579 graph_width = width - number_width - 6 - name_width;
1580 }
1581
1582 /*
1583 * From here name_width is the width of the name area,
1584 * and graph_width is the width of the graph area.
1585 * max_change is used to scale graph properly.
1586 */
1587 for (i = 0; i < count; i++) {
1588 const char *prefix = "";
1589 struct diffstat_file *file = data->files[i];
1590 char *name = file->print_name;
1591 uintmax_t added = file->added;
1592 uintmax_t deleted = file->deleted;
1593 int name_len;
1594
1595 if (!file->is_interesting && (added + deleted == 0))
1596 continue;
1597
1598 /*
1599 * "scale" the filename
1600 */
1601 len = name_width;
1602 name_len = strlen(name);
1603 if (name_width < name_len) {
1604 char *slash;
1605 prefix = "...";
1606 len -= 3;
1607 name += name_len - len;
1608 slash = strchr(name, '/');
1609 if (slash)
1610 name = slash;
1611 }
1612
1613 if (file->is_binary) {
1614 fprintf(options->file, "%s", line_prefix);
1615 show_name(options->file, prefix, name, len);
1616 fprintf(options->file, " %*s", number_width, "Bin");
1617 if (!added && !deleted) {
1618 putc('\n', options->file);
1619 continue;
1620 }
1621 fprintf(options->file, " %s%"PRIuMAX"%s",
1622 del_c, deleted, reset);
1623 fprintf(options->file, " -> ");
1624 fprintf(options->file, "%s%"PRIuMAX"%s",
1625 add_c, added, reset);
1626 fprintf(options->file, " bytes");
1627 fprintf(options->file, "\n");
1628 continue;
1629 }
1630 else if (file->is_unmerged) {
1631 fprintf(options->file, "%s", line_prefix);
1632 show_name(options->file, prefix, name, len);
1633 fprintf(options->file, " Unmerged\n");
1634 continue;
1635 }
1636
1637 /*
1638 * scale the add/delete
1639 */
1640 add = added;
1641 del = deleted;
1642
1643 if (graph_width <= max_change) {
1644 int total = add + del;
1645
1646 total = scale_linear(add + del, graph_width, max_change);
1647 if (total < 2 && add && del)
1648 /* width >= 2 due to the sanity check */
1649 total = 2;
1650 if (add < del) {
1651 add = scale_linear(add, graph_width, max_change);
1652 del = total - add;
1653 } else {
1654 del = scale_linear(del, graph_width, max_change);
1655 add = total - del;
1656 }
1657 }
1658 fprintf(options->file, "%s", line_prefix);
1659 show_name(options->file, prefix, name, len);
1660 fprintf(options->file, " %*"PRIuMAX"%s",
1661 number_width, added + deleted,
1662 added + deleted ? " " : "");
1663 show_graph(options->file, '+', add, add_c, reset);
1664 show_graph(options->file, '-', del, del_c, reset);
1665 fprintf(options->file, "\n");
1666 }
1667
1668 for (i = 0; i < data->nr; i++) {
1669 struct diffstat_file *file = data->files[i];
1670 uintmax_t added = file->added;
1671 uintmax_t deleted = file->deleted;
1672
1673 if (file->is_unmerged ||
1674 (!file->is_interesting && (added + deleted == 0))) {
1675 total_files--;
1676 continue;
1677 }
1678
1679 if (!file->is_binary) {
1680 adds += added;
1681 dels += deleted;
1682 }
1683 if (i < count)
1684 continue;
1685 if (!extra_shown)
1686 fprintf(options->file, "%s ...\n", line_prefix);
1687 extra_shown = 1;
1688 }
1689 fprintf(options->file, "%s", line_prefix);
1690 print_stat_summary(options->file, total_files, adds, dels);
1691 }
1692
1693 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1694 {
1695 int i, adds = 0, dels = 0, total_files = data->nr;
1696
1697 if (data->nr == 0)
1698 return;
1699
1700 for (i = 0; i < data->nr; i++) {
1701 int added = data->files[i]->added;
1702 int deleted= data->files[i]->deleted;
1703
1704 if (data->files[i]->is_unmerged ||
1705 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1706 total_files--;
1707 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1708 adds += added;
1709 dels += deleted;
1710 }
1711 }
1712 if (options->output_prefix) {
1713 struct strbuf *msg = NULL;
1714 msg = options->output_prefix(options,
1715 options->output_prefix_data);
1716 fprintf(options->file, "%s", msg->buf);
1717 }
1718 print_stat_summary(options->file, total_files, adds, dels);
1719 }
1720
1721 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1722 {
1723 int i;
1724
1725 if (data->nr == 0)
1726 return;
1727
1728 for (i = 0; i < data->nr; i++) {
1729 struct diffstat_file *file = data->files[i];
1730
1731 if (options->output_prefix) {
1732 struct strbuf *msg = NULL;
1733 msg = options->output_prefix(options,
1734 options->output_prefix_data);
1735 fprintf(options->file, "%s", msg->buf);
1736 }
1737
1738 if (file->is_binary)
1739 fprintf(options->file, "-\t-\t");
1740 else
1741 fprintf(options->file,
1742 "%"PRIuMAX"\t%"PRIuMAX"\t",
1743 file->added, file->deleted);
1744 if (options->line_termination) {
1745 fill_print_name(file);
1746 if (!file->is_renamed)
1747 write_name_quoted(file->name, options->file,
1748 options->line_termination);
1749 else {
1750 fputs(file->print_name, options->file);
1751 putc(options->line_termination, options->file);
1752 }
1753 } else {
1754 if (file->is_renamed) {
1755 putc('\0', options->file);
1756 write_name_quoted(file->from_name, options->file, '\0');
1757 }
1758 write_name_quoted(file->name, options->file, '\0');
1759 }
1760 }
1761 }
1762
1763 struct dirstat_file {
1764 const char *name;
1765 unsigned long changed;
1766 };
1767
1768 struct dirstat_dir {
1769 struct dirstat_file *files;
1770 int alloc, nr, permille, cumulative;
1771 };
1772
1773 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1774 unsigned long changed, const char *base, int baselen)
1775 {
1776 unsigned long this_dir = 0;
1777 unsigned int sources = 0;
1778 const char *line_prefix = "";
1779 struct strbuf *msg = NULL;
1780
1781 if (opt->output_prefix) {
1782 msg = opt->output_prefix(opt, opt->output_prefix_data);
1783 line_prefix = msg->buf;
1784 }
1785
1786 while (dir->nr) {
1787 struct dirstat_file *f = dir->files;
1788 int namelen = strlen(f->name);
1789 unsigned long this;
1790 char *slash;
1791
1792 if (namelen < baselen)
1793 break;
1794 if (memcmp(f->name, base, baselen))
1795 break;
1796 slash = strchr(f->name + baselen, '/');
1797 if (slash) {
1798 int newbaselen = slash + 1 - f->name;
1799 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1800 sources++;
1801 } else {
1802 this = f->changed;
1803 dir->files++;
1804 dir->nr--;
1805 sources += 2;
1806 }
1807 this_dir += this;
1808 }
1809
1810 /*
1811 * We don't report dirstat's for
1812 * - the top level
1813 * - or cases where everything came from a single directory
1814 * under this directory (sources == 1).
1815 */
1816 if (baselen && sources != 1) {
1817 if (this_dir) {
1818 int permille = this_dir * 1000 / changed;
1819 if (permille >= dir->permille) {
1820 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1821 permille / 10, permille % 10, baselen, base);
1822 if (!dir->cumulative)
1823 return 0;
1824 }
1825 }
1826 }
1827 return this_dir;
1828 }
1829
1830 static int dirstat_compare(const void *_a, const void *_b)
1831 {
1832 const struct dirstat_file *a = _a;
1833 const struct dirstat_file *b = _b;
1834 return strcmp(a->name, b->name);
1835 }
1836
1837 static void show_dirstat(struct diff_options *options)
1838 {
1839 int i;
1840 unsigned long changed;
1841 struct dirstat_dir dir;
1842 struct diff_queue_struct *q = &diff_queued_diff;
1843
1844 dir.files = NULL;
1845 dir.alloc = 0;
1846 dir.nr = 0;
1847 dir.permille = options->dirstat_permille;
1848 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1849
1850 changed = 0;
1851 for (i = 0; i < q->nr; i++) {
1852 struct diff_filepair *p = q->queue[i];
1853 const char *name;
1854 unsigned long copied, added, damage;
1855 int content_changed;
1856
1857 name = p->two->path ? p->two->path : p->one->path;
1858
1859 if (p->one->sha1_valid && p->two->sha1_valid)
1860 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1861 else
1862 content_changed = 1;
1863
1864 if (!content_changed) {
1865 /*
1866 * The SHA1 has not changed, so pre-/post-content is
1867 * identical. We can therefore skip looking at the
1868 * file contents altogether.
1869 */
1870 damage = 0;
1871 goto found_damage;
1872 }
1873
1874 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1875 /*
1876 * In --dirstat-by-file mode, we don't really need to
1877 * look at the actual file contents at all.
1878 * The fact that the SHA1 changed is enough for us to
1879 * add this file to the list of results
1880 * (with each file contributing equal damage).
1881 */
1882 damage = 1;
1883 goto found_damage;
1884 }
1885
1886 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1887 diff_populate_filespec(p->one, 0);
1888 diff_populate_filespec(p->two, 0);
1889 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1890 &copied, &added);
1891 diff_free_filespec_data(p->one);
1892 diff_free_filespec_data(p->two);
1893 } else if (DIFF_FILE_VALID(p->one)) {
1894 diff_populate_filespec(p->one, 1);
1895 copied = added = 0;
1896 diff_free_filespec_data(p->one);
1897 } else if (DIFF_FILE_VALID(p->two)) {
1898 diff_populate_filespec(p->two, 1);
1899 copied = 0;
1900 added = p->two->size;
1901 diff_free_filespec_data(p->two);
1902 } else
1903 continue;
1904
1905 /*
1906 * Original minus copied is the removed material,
1907 * added is the new material. They are both damages
1908 * made to the preimage.
1909 * If the resulting damage is zero, we know that
1910 * diffcore_count_changes() considers the two entries to
1911 * be identical, but since content_changed is true, we
1912 * know that there must have been _some_ kind of change,
1913 * so we force all entries to have damage > 0.
1914 */
1915 damage = (p->one->size - copied) + added;
1916 if (!damage)
1917 damage = 1;
1918
1919 found_damage:
1920 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1921 dir.files[dir.nr].name = name;
1922 dir.files[dir.nr].changed = damage;
1923 changed += damage;
1924 dir.nr++;
1925 }
1926
1927 /* This can happen even with many files, if everything was renames */
1928 if (!changed)
1929 return;
1930
1931 /* Show all directories with more than x% of the changes */
1932 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1933 gather_dirstat(options, &dir, changed, "", 0);
1934 }
1935
1936 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1937 {
1938 int i;
1939 unsigned long changed;
1940 struct dirstat_dir dir;
1941
1942 if (data->nr == 0)
1943 return;
1944
1945 dir.files = NULL;
1946 dir.alloc = 0;
1947 dir.nr = 0;
1948 dir.permille = options->dirstat_permille;
1949 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1950
1951 changed = 0;
1952 for (i = 0; i < data->nr; i++) {
1953 struct diffstat_file *file = data->files[i];
1954 unsigned long damage = file->added + file->deleted;
1955 if (file->is_binary)
1956 /*
1957 * binary files counts bytes, not lines. Must find some
1958 * way to normalize binary bytes vs. textual lines.
1959 * The following heuristic assumes that there are 64
1960 * bytes per "line".
1961 * This is stupid and ugly, but very cheap...
1962 */
1963 damage = (damage + 63) / 64;
1964 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1965 dir.files[dir.nr].name = file->name;
1966 dir.files[dir.nr].changed = damage;
1967 changed += damage;
1968 dir.nr++;
1969 }
1970
1971 /* This can happen even with many files, if everything was renames */
1972 if (!changed)
1973 return;
1974
1975 /* Show all directories with more than x% of the changes */
1976 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1977 gather_dirstat(options, &dir, changed, "", 0);
1978 }
1979
1980 static void free_diffstat_info(struct diffstat_t *diffstat)
1981 {
1982 int i;
1983 for (i = 0; i < diffstat->nr; i++) {
1984 struct diffstat_file *f = diffstat->files[i];
1985 if (f->name != f->print_name)
1986 free(f->print_name);
1987 free(f->name);
1988 free(f->from_name);
1989 free(f);
1990 }
1991 free(diffstat->files);
1992 }
1993
1994 struct checkdiff_t {
1995 const char *filename;
1996 int lineno;
1997 int conflict_marker_size;
1998 struct diff_options *o;
1999 unsigned ws_rule;
2000 unsigned status;
2001 };
2002
2003 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2004 {
2005 char firstchar;
2006 int cnt;
2007
2008 if (len < marker_size + 1)
2009 return 0;
2010 firstchar = line[0];
2011 switch (firstchar) {
2012 case '=': case '>': case '<': case '|':
2013 break;
2014 default:
2015 return 0;
2016 }
2017 for (cnt = 1; cnt < marker_size; cnt++)
2018 if (line[cnt] != firstchar)
2019 return 0;
2020 /* line[1] thru line[marker_size-1] are same as firstchar */
2021 if (len < marker_size + 1 || !isspace(line[marker_size]))
2022 return 0;
2023 return 1;
2024 }
2025
2026 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2027 {
2028 struct checkdiff_t *data = priv;
2029 int marker_size = data->conflict_marker_size;
2030 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2031 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2032 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2033 char *err;
2034 char *line_prefix = "";
2035 struct strbuf *msgbuf;
2036
2037 assert(data->o);
2038 if (data->o->output_prefix) {
2039 msgbuf = data->o->output_prefix(data->o,
2040 data->o->output_prefix_data);
2041 line_prefix = msgbuf->buf;
2042 }
2043
2044 if (line[0] == '+') {
2045 unsigned bad;
2046 data->lineno++;
2047 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2048 data->status |= 1;
2049 fprintf(data->o->file,
2050 "%s%s:%d: leftover conflict marker\n",
2051 line_prefix, data->filename, data->lineno);
2052 }
2053 bad = ws_check(line + 1, len - 1, data->ws_rule);
2054 if (!bad)
2055 return;
2056 data->status |= bad;
2057 err = whitespace_error_string(bad);
2058 fprintf(data->o->file, "%s%s:%d: %s.\n",
2059 line_prefix, data->filename, data->lineno, err);
2060 free(err);
2061 emit_line(data->o, set, reset, line, 1);
2062 ws_check_emit(line + 1, len - 1, data->ws_rule,
2063 data->o->file, set, reset, ws);
2064 } else if (line[0] == ' ') {
2065 data->lineno++;
2066 } else if (line[0] == '@') {
2067 char *plus = strchr(line, '+');
2068 if (plus)
2069 data->lineno = strtol(plus, NULL, 10) - 1;
2070 else
2071 die("invalid diff");
2072 }
2073 }
2074
2075 static unsigned char *deflate_it(char *data,
2076 unsigned long size,
2077 unsigned long *result_size)
2078 {
2079 int bound;
2080 unsigned char *deflated;
2081 git_zstream stream;
2082
2083 memset(&stream, 0, sizeof(stream));
2084 git_deflate_init(&stream, zlib_compression_level);
2085 bound = git_deflate_bound(&stream, size);
2086 deflated = xmalloc(bound);
2087 stream.next_out = deflated;
2088 stream.avail_out = bound;
2089
2090 stream.next_in = (unsigned char *)data;
2091 stream.avail_in = size;
2092 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2093 ; /* nothing */
2094 git_deflate_end(&stream);
2095 *result_size = stream.total_out;
2096 return deflated;
2097 }
2098
2099 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2100 {
2101 void *cp;
2102 void *delta;
2103 void *deflated;
2104 void *data;
2105 unsigned long orig_size;
2106 unsigned long delta_size;
2107 unsigned long deflate_size;
2108 unsigned long data_size;
2109
2110 /* We could do deflated delta, or we could do just deflated two,
2111 * whichever is smaller.
2112 */
2113 delta = NULL;
2114 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2115 if (one->size && two->size) {
2116 delta = diff_delta(one->ptr, one->size,
2117 two->ptr, two->size,
2118 &delta_size, deflate_size);
2119 if (delta) {
2120 void *to_free = delta;
2121 orig_size = delta_size;
2122 delta = deflate_it(delta, delta_size, &delta_size);
2123 free(to_free);
2124 }
2125 }
2126
2127 if (delta && delta_size < deflate_size) {
2128 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2129 free(deflated);
2130 data = delta;
2131 data_size = delta_size;
2132 }
2133 else {
2134 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2135 free(delta);
2136 data = deflated;
2137 data_size = deflate_size;
2138 }
2139
2140 /* emit data encoded in base85 */
2141 cp = data;
2142 while (data_size) {
2143 int bytes = (52 < data_size) ? 52 : data_size;
2144 char line[70];
2145 data_size -= bytes;
2146 if (bytes <= 26)
2147 line[0] = bytes + 'A' - 1;
2148 else
2149 line[0] = bytes - 26 + 'a' - 1;
2150 encode_85(line + 1, cp, bytes);
2151 cp = (char *) cp + bytes;
2152 fprintf(file, "%s", prefix);
2153 fputs(line, file);
2154 fputc('\n', file);
2155 }
2156 fprintf(file, "%s\n", prefix);
2157 free(data);
2158 }
2159
2160 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2161 {
2162 fprintf(file, "%sGIT binary patch\n", prefix);
2163 emit_binary_diff_body(file, one, two, prefix);
2164 emit_binary_diff_body(file, two, one, prefix);
2165 }
2166
2167 int diff_filespec_is_binary(struct diff_filespec *one)
2168 {
2169 if (one->is_binary == -1) {
2170 diff_filespec_load_driver(one);
2171 if (one->driver->binary != -1)
2172 one->is_binary = one->driver->binary;
2173 else {
2174 if (!one->data && DIFF_FILE_VALID(one))
2175 diff_populate_filespec(one, 0);
2176 if (one->data)
2177 one->is_binary = buffer_is_binary(one->data,
2178 one->size);
2179 if (one->is_binary == -1)
2180 one->is_binary = 0;
2181 }
2182 }
2183 return one->is_binary;
2184 }
2185
2186 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2187 {
2188 diff_filespec_load_driver(one);
2189 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2190 }
2191
2192 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2193 {
2194 if (!options->a_prefix)
2195 options->a_prefix = a;
2196 if (!options->b_prefix)
2197 options->b_prefix = b;
2198 }
2199
2200 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2201 {
2202 if (!DIFF_FILE_VALID(one))
2203 return NULL;
2204
2205 diff_filespec_load_driver(one);
2206 return userdiff_get_textconv(one->driver);
2207 }
2208
2209 static void builtin_diff(const char *name_a,
2210 const char *name_b,
2211 struct diff_filespec *one,
2212 struct diff_filespec *two,
2213 const char *xfrm_msg,
2214 int must_show_header,
2215 struct diff_options *o,
2216 int complete_rewrite)
2217 {
2218 mmfile_t mf1, mf2;
2219 const char *lbl[2];
2220 char *a_one, *b_two;
2221 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2222 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2223 const char *a_prefix, *b_prefix;
2224 struct userdiff_driver *textconv_one = NULL;
2225 struct userdiff_driver *textconv_two = NULL;
2226 struct strbuf header = STRBUF_INIT;
2227 struct strbuf *msgbuf;
2228 char *line_prefix = "";
2229
2230 if (o->output_prefix) {
2231 msgbuf = o->output_prefix(o, o->output_prefix_data);
2232 line_prefix = msgbuf->buf;
2233 }
2234
2235 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2236 (!one->mode || S_ISGITLINK(one->mode)) &&
2237 (!two->mode || S_ISGITLINK(two->mode))) {
2238 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2239 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2240 show_submodule_summary(o->file, one ? one->path : two->path,
2241 one->sha1, two->sha1, two->dirty_submodule,
2242 del, add, reset);
2243 return;
2244 }
2245
2246 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2247 textconv_one = get_textconv(one);
2248 textconv_two = get_textconv(two);
2249 }
2250
2251 diff_set_mnemonic_prefix(o, "a/", "b/");
2252 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2253 a_prefix = o->b_prefix;
2254 b_prefix = o->a_prefix;
2255 } else {
2256 a_prefix = o->a_prefix;
2257 b_prefix = o->b_prefix;
2258 }
2259
2260 /* Never use a non-valid filename anywhere if at all possible */
2261 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2262 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2263
2264 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2265 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2266 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2267 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2268 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2269 if (lbl[0][0] == '/') {
2270 /* /dev/null */
2271 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2272 if (xfrm_msg)
2273 strbuf_addstr(&header, xfrm_msg);
2274 must_show_header = 1;
2275 }
2276 else if (lbl[1][0] == '/') {
2277 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2278 if (xfrm_msg)
2279 strbuf_addstr(&header, xfrm_msg);
2280 must_show_header = 1;
2281 }
2282 else {
2283 if (one->mode != two->mode) {
2284 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2285 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2286 must_show_header = 1;
2287 }
2288 if (xfrm_msg)
2289 strbuf_addstr(&header, xfrm_msg);
2290
2291 /*
2292 * we do not run diff between different kind
2293 * of objects.
2294 */
2295 if ((one->mode ^ two->mode) & S_IFMT)
2296 goto free_ab_and_return;
2297 if (complete_rewrite &&
2298 (textconv_one || !diff_filespec_is_binary(one)) &&
2299 (textconv_two || !diff_filespec_is_binary(two))) {
2300 fprintf(o->file, "%s", header.buf);
2301 strbuf_reset(&header);
2302 emit_rewrite_diff(name_a, name_b, one, two,
2303 textconv_one, textconv_two, o);
2304 o->found_changes = 1;
2305 goto free_ab_and_return;
2306 }
2307 }
2308
2309 if (o->irreversible_delete && lbl[1][0] == '/') {
2310 fprintf(o->file, "%s", header.buf);
2311 strbuf_reset(&header);
2312 goto free_ab_and_return;
2313 } else if (!DIFF_OPT_TST(o, TEXT) &&
2314 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2315 (!textconv_two && diff_filespec_is_binary(two)) )) {
2316 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2317 die("unable to read files to diff");
2318 /* Quite common confusing case */
2319 if (mf1.size == mf2.size &&
2320 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2321 if (must_show_header)
2322 fprintf(o->file, "%s", header.buf);
2323 goto free_ab_and_return;
2324 }
2325 fprintf(o->file, "%s", header.buf);
2326 strbuf_reset(&header);
2327 if (DIFF_OPT_TST(o, BINARY))
2328 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2329 else
2330 fprintf(o->file, "%sBinary files %s and %s differ\n",
2331 line_prefix, lbl[0], lbl[1]);
2332 o->found_changes = 1;
2333 } else {
2334 /* Crazy xdl interfaces.. */
2335 const char *diffopts = getenv("GIT_DIFF_OPTS");
2336 xpparam_t xpp;
2337 xdemitconf_t xecfg;
2338 struct emit_callback ecbdata;
2339 const struct userdiff_funcname *pe;
2340
2341 if (must_show_header) {
2342 fprintf(o->file, "%s", header.buf);
2343 strbuf_reset(&header);
2344 }
2345
2346 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2347 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2348
2349 pe = diff_funcname_pattern(one);
2350 if (!pe)
2351 pe = diff_funcname_pattern(two);
2352
2353 memset(&xpp, 0, sizeof(xpp));
2354 memset(&xecfg, 0, sizeof(xecfg));
2355 memset(&ecbdata, 0, sizeof(ecbdata));
2356 ecbdata.label_path = lbl;
2357 ecbdata.color_diff = want_color(o->use_color);
2358 ecbdata.found_changesp = &o->found_changes;
2359 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2360 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2361 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2362 ecbdata.opt = o;
2363 ecbdata.header = header.len ? &header : NULL;
2364 xpp.flags = o->xdl_opts;
2365 xecfg.ctxlen = o->context;
2366 xecfg.interhunkctxlen = o->interhunkcontext;
2367 xecfg.flags = XDL_EMIT_FUNCNAMES;
2368 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2369 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2370 if (pe)
2371 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2372 if (!diffopts)
2373 ;
2374 else if (!prefixcmp(diffopts, "--unified="))
2375 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2376 else if (!prefixcmp(diffopts, "-u"))
2377 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2378 if (o->word_diff)
2379 init_diff_words_data(&ecbdata, o, one, two);
2380 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2381 &xpp, &xecfg);
2382 if (o->word_diff)
2383 free_diff_words_data(&ecbdata);
2384 if (textconv_one)
2385 free(mf1.ptr);
2386 if (textconv_two)
2387 free(mf2.ptr);
2388 xdiff_clear_find_func(&xecfg);
2389 }
2390
2391 free_ab_and_return:
2392 strbuf_release(&header);
2393 diff_free_filespec_data(one);
2394 diff_free_filespec_data(two);
2395 free(a_one);
2396 free(b_two);
2397 return;
2398 }
2399
2400 static void builtin_diffstat(const char *name_a, const char *name_b,
2401 struct diff_filespec *one,
2402 struct diff_filespec *two,
2403 struct diffstat_t *diffstat,
2404 struct diff_options *o,
2405 struct diff_filepair *p)
2406 {
2407 mmfile_t mf1, mf2;
2408 struct diffstat_file *data;
2409 int same_contents;
2410 int complete_rewrite = 0;
2411
2412 if (!DIFF_PAIR_UNMERGED(p)) {
2413 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2414 complete_rewrite = 1;
2415 }
2416
2417 data = diffstat_add(diffstat, name_a, name_b);
2418 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2419
2420 if (!one || !two) {
2421 data->is_unmerged = 1;
2422 return;
2423 }
2424
2425 same_contents = !hashcmp(one->sha1, two->sha1);
2426
2427 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2428 data->is_binary = 1;
2429 if (same_contents) {
2430 data->added = 0;
2431 data->deleted = 0;
2432 } else {
2433 data->added = diff_filespec_size(two);
2434 data->deleted = diff_filespec_size(one);
2435 }
2436 }
2437
2438 else if (complete_rewrite) {
2439 diff_populate_filespec(one, 0);
2440 diff_populate_filespec(two, 0);
2441 data->deleted = count_lines(one->data, one->size);
2442 data->added = count_lines(two->data, two->size);
2443 }
2444
2445 else if (!same_contents) {
2446 /* Crazy xdl interfaces.. */
2447 xpparam_t xpp;
2448 xdemitconf_t xecfg;
2449
2450 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2451 die("unable to read files to diff");
2452
2453 memset(&xpp, 0, sizeof(xpp));
2454 memset(&xecfg, 0, sizeof(xecfg));
2455 xpp.flags = o->xdl_opts;
2456 xecfg.ctxlen = o->context;
2457 xecfg.interhunkctxlen = o->interhunkcontext;
2458 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2459 &xpp, &xecfg);
2460 }
2461
2462 diff_free_filespec_data(one);
2463 diff_free_filespec_data(two);
2464 }
2465
2466 static void builtin_checkdiff(const char *name_a, const char *name_b,
2467 const char *attr_path,
2468 struct diff_filespec *one,
2469 struct diff_filespec *two,
2470 struct diff_options *o)
2471 {
2472 mmfile_t mf1, mf2;
2473 struct checkdiff_t data;
2474
2475 if (!two)
2476 return;
2477
2478 memset(&data, 0, sizeof(data));
2479 data.filename = name_b ? name_b : name_a;
2480 data.lineno = 0;
2481 data.o = o;
2482 data.ws_rule = whitespace_rule(attr_path);
2483 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2484
2485 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2486 die("unable to read files to diff");
2487
2488 /*
2489 * All the other codepaths check both sides, but not checking
2490 * the "old" side here is deliberate. We are checking the newly
2491 * introduced changes, and as long as the "new" side is text, we
2492 * can and should check what it introduces.
2493 */
2494 if (diff_filespec_is_binary(two))
2495 goto free_and_return;
2496 else {
2497 /* Crazy xdl interfaces.. */
2498 xpparam_t xpp;
2499 xdemitconf_t xecfg;
2500
2501 memset(&xpp, 0, sizeof(xpp));
2502 memset(&xecfg, 0, sizeof(xecfg));
2503 xecfg.ctxlen = 1; /* at least one context line */
2504 xpp.flags = 0;
2505 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2506 &xpp, &xecfg);
2507
2508 if (data.ws_rule & WS_BLANK_AT_EOF) {
2509 struct emit_callback ecbdata;
2510 int blank_at_eof;
2511
2512 ecbdata.ws_rule = data.ws_rule;
2513 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2514 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2515
2516 if (blank_at_eof) {
2517 static char *err;
2518 if (!err)
2519 err = whitespace_error_string(WS_BLANK_AT_EOF);
2520 fprintf(o->file, "%s:%d: %s.\n",
2521 data.filename, blank_at_eof, err);
2522 data.status = 1; /* report errors */
2523 }
2524 }
2525 }
2526 free_and_return:
2527 diff_free_filespec_data(one);
2528 diff_free_filespec_data(two);
2529 if (data.status)
2530 DIFF_OPT_SET(o, CHECK_FAILED);
2531 }
2532
2533 struct diff_filespec *alloc_filespec(const char *path)
2534 {
2535 int namelen = strlen(path);
2536 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2537
2538 memset(spec, 0, sizeof(*spec));
2539 spec->path = (char *)(spec + 1);
2540 memcpy(spec->path, path, namelen+1);
2541 spec->count = 1;
2542 spec->is_binary = -1;
2543 return spec;
2544 }
2545
2546 void free_filespec(struct diff_filespec *spec)
2547 {
2548 if (!--spec->count) {
2549 diff_free_filespec_data(spec);
2550 free(spec);
2551 }
2552 }
2553
2554 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2555 int sha1_valid, unsigned short mode)
2556 {
2557 if (mode) {
2558 spec->mode = canon_mode(mode);
2559 hashcpy(spec->sha1, sha1);
2560 spec->sha1_valid = sha1_valid;
2561 }
2562 }
2563
2564 /*
2565 * Given a name and sha1 pair, if the index tells us the file in
2566 * the work tree has that object contents, return true, so that
2567 * prepare_temp_file() does not have to inflate and extract.
2568 */
2569 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2570 {
2571 struct cache_entry *ce;
2572 struct stat st;
2573 int pos, len;
2574
2575 /*
2576 * We do not read the cache ourselves here, because the
2577 * benchmark with my previous version that always reads cache
2578 * shows that it makes things worse for diff-tree comparing
2579 * two linux-2.6 kernel trees in an already checked out work
2580 * tree. This is because most diff-tree comparisons deal with
2581 * only a small number of files, while reading the cache is
2582 * expensive for a large project, and its cost outweighs the
2583 * savings we get by not inflating the object to a temporary
2584 * file. Practically, this code only helps when we are used
2585 * by diff-cache --cached, which does read the cache before
2586 * calling us.
2587 */
2588 if (!active_cache)
2589 return 0;
2590
2591 /* We want to avoid the working directory if our caller
2592 * doesn't need the data in a normal file, this system
2593 * is rather slow with its stat/open/mmap/close syscalls,
2594 * and the object is contained in a pack file. The pack
2595 * is probably already open and will be faster to obtain
2596 * the data through than the working directory. Loose
2597 * objects however would tend to be slower as they need
2598 * to be individually opened and inflated.
2599 */
2600 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2601 return 0;
2602
2603 len = strlen(name);
2604 pos = cache_name_pos(name, len);
2605 if (pos < 0)
2606 return 0;
2607 ce = active_cache[pos];
2608
2609 /*
2610 * This is not the sha1 we are looking for, or
2611 * unreusable because it is not a regular file.
2612 */
2613 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2614 return 0;
2615
2616 /*
2617 * If ce is marked as "assume unchanged", there is no
2618 * guarantee that work tree matches what we are looking for.
2619 */
2620 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2621 return 0;
2622
2623 /*
2624 * If ce matches the file in the work tree, we can reuse it.
2625 */
2626 if (ce_uptodate(ce) ||
2627 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2628 return 1;
2629
2630 return 0;
2631 }
2632
2633 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2634 {
2635 int len;
2636 char *data = xmalloc(100), *dirty = "";
2637
2638 /* Are we looking at the work tree? */
2639 if (s->dirty_submodule)
2640 dirty = "-dirty";
2641
2642 len = snprintf(data, 100,
2643 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2644 s->data = data;
2645 s->size = len;
2646 s->should_free = 1;
2647 if (size_only) {
2648 s->data = NULL;
2649 free(data);
2650 }
2651 return 0;
2652 }
2653
2654 /*
2655 * While doing rename detection and pickaxe operation, we may need to
2656 * grab the data for the blob (or file) for our own in-core comparison.
2657 * diff_filespec has data and size fields for this purpose.
2658 */
2659 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2660 {
2661 int err = 0;
2662 if (!DIFF_FILE_VALID(s))
2663 die("internal error: asking to populate invalid file.");
2664 if (S_ISDIR(s->mode))
2665 return -1;
2666
2667 if (s->data)
2668 return 0;
2669
2670 if (size_only && 0 < s->size)
2671 return 0;
2672
2673 if (S_ISGITLINK(s->mode))
2674 return diff_populate_gitlink(s, size_only);
2675
2676 if (!s->sha1_valid ||
2677 reuse_worktree_file(s->path, s->sha1, 0)) {
2678 struct strbuf buf = STRBUF_INIT;
2679 struct stat st;
2680 int fd;
2681
2682 if (lstat(s->path, &st) < 0) {
2683 if (errno == ENOENT) {
2684 err_empty:
2685 err = -1;
2686 empty:
2687 s->data = (char *)"";
2688 s->size = 0;
2689 return err;
2690 }
2691 }
2692 s->size = xsize_t(st.st_size);
2693 if (!s->size)
2694 goto empty;
2695 if (S_ISLNK(st.st_mode)) {
2696 struct strbuf sb = STRBUF_INIT;
2697
2698 if (strbuf_readlink(&sb, s->path, s->size))
2699 goto err_empty;
2700 s->size = sb.len;
2701 s->data = strbuf_detach(&sb, NULL);
2702 s->should_free = 1;
2703 return 0;
2704 }
2705 if (size_only)
2706 return 0;
2707 fd = open(s->path, O_RDONLY);
2708 if (fd < 0)
2709 goto err_empty;
2710 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2711 close(fd);
2712 s->should_munmap = 1;
2713
2714 /*
2715 * Convert from working tree format to canonical git format
2716 */
2717 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2718 size_t size = 0;
2719 munmap(s->data, s->size);
2720 s->should_munmap = 0;
2721 s->data = strbuf_detach(&buf, &size);
2722 s->size = size;
2723 s->should_free = 1;
2724 }
2725 }
2726 else {
2727 enum object_type type;
2728 if (size_only) {
2729 type = sha1_object_info(s->sha1, &s->size);
2730 if (type < 0)
2731 die("unable to read %s", sha1_to_hex(s->sha1));
2732 } else {
2733 s->data = read_sha1_file(s->sha1, &type, &s->size);
2734 if (!s->data)
2735 die("unable to read %s", sha1_to_hex(s->sha1));
2736 s->should_free = 1;
2737 }
2738 }
2739 return 0;
2740 }
2741
2742 void diff_free_filespec_blob(struct diff_filespec *s)
2743 {
2744 if (s->should_free)
2745 free(s->data);
2746 else if (s->should_munmap)
2747 munmap(s->data, s->size);
2748
2749 if (s->should_free || s->should_munmap) {
2750 s->should_free = s->should_munmap = 0;
2751 s->data = NULL;
2752 }
2753 }
2754
2755 void diff_free_filespec_data(struct diff_filespec *s)
2756 {
2757 diff_free_filespec_blob(s);
2758 free(s->cnt_data);
2759 s->cnt_data = NULL;
2760 }
2761
2762 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2763 void *blob,
2764 unsigned long size,
2765 const unsigned char *sha1,
2766 int mode)
2767 {
2768 int fd;
2769 struct strbuf buf = STRBUF_INIT;
2770 struct strbuf template = STRBUF_INIT;
2771 char *path_dup = xstrdup(path);
2772 const char *base = basename(path_dup);
2773
2774 /* Generate "XXXXXX_basename.ext" */
2775 strbuf_addstr(&template, "XXXXXX_");
2776 strbuf_addstr(&template, base);
2777
2778 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2779 strlen(base) + 1);
2780 if (fd < 0)
2781 die_errno("unable to create temp-file");
2782 if (convert_to_working_tree(path,
2783 (const char *)blob, (size_t)size, &buf)) {
2784 blob = buf.buf;
2785 size = buf.len;
2786 }
2787 if (write_in_full(fd, blob, size) != size)
2788 die_errno("unable to write temp-file");
2789 close(fd);
2790 temp->name = temp->tmp_path;
2791 strcpy(temp->hex, sha1_to_hex(sha1));
2792 temp->hex[40] = 0;
2793 sprintf(temp->mode, "%06o", mode);
2794 strbuf_release(&buf);
2795 strbuf_release(&template);
2796 free(path_dup);
2797 }
2798
2799 static struct diff_tempfile *prepare_temp_file(const char *name,
2800 struct diff_filespec *one)
2801 {
2802 struct diff_tempfile *temp = claim_diff_tempfile();
2803
2804 if (!DIFF_FILE_VALID(one)) {
2805 not_a_valid_file:
2806 /* A '-' entry produces this for file-2, and
2807 * a '+' entry produces this for file-1.
2808 */
2809 temp->name = "/dev/null";
2810 strcpy(temp->hex, ".");
2811 strcpy(temp->mode, ".");
2812 return temp;
2813 }
2814
2815 if (!remove_tempfile_installed) {
2816 atexit(remove_tempfile);
2817 sigchain_push_common(remove_tempfile_on_signal);
2818 remove_tempfile_installed = 1;
2819 }
2820
2821 if (!one->sha1_valid ||
2822 reuse_worktree_file(name, one->sha1, 1)) {
2823 struct stat st;
2824 if (lstat(name, &st) < 0) {
2825 if (errno == ENOENT)
2826 goto not_a_valid_file;
2827 die_errno("stat(%s)", name);
2828 }
2829 if (S_ISLNK(st.st_mode)) {
2830 struct strbuf sb = STRBUF_INIT;
2831 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2832 die_errno("readlink(%s)", name);
2833 prep_temp_blob(name, temp, sb.buf, sb.len,
2834 (one->sha1_valid ?
2835 one->sha1 : null_sha1),
2836 (one->sha1_valid ?
2837 one->mode : S_IFLNK));
2838 strbuf_release(&sb);
2839 }
2840 else {
2841 /* we can borrow from the file in the work tree */
2842 temp->name = name;
2843 if (!one->sha1_valid)
2844 strcpy(temp->hex, sha1_to_hex(null_sha1));
2845 else
2846 strcpy(temp->hex, sha1_to_hex(one->sha1));
2847 /* Even though we may sometimes borrow the
2848 * contents from the work tree, we always want
2849 * one->mode. mode is trustworthy even when
2850 * !(one->sha1_valid), as long as
2851 * DIFF_FILE_VALID(one).
2852 */
2853 sprintf(temp->mode, "%06o", one->mode);
2854 }
2855 return temp;
2856 }
2857 else {
2858 if (diff_populate_filespec(one, 0))
2859 die("cannot read data blob for %s", one->path);
2860 prep_temp_blob(name, temp, one->data, one->size,
2861 one->sha1, one->mode);
2862 }
2863 return temp;
2864 }
2865
2866 /* An external diff command takes:
2867 *
2868 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2869 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2870 *
2871 */
2872 static void run_external_diff(const char *pgm,
2873 const char *name,
2874 const char *other,
2875 struct diff_filespec *one,
2876 struct diff_filespec *two,
2877 const char *xfrm_msg,
2878 int complete_rewrite)
2879 {
2880 const char *spawn_arg[10];
2881 int retval;
2882 const char **arg = &spawn_arg[0];
2883
2884 if (one && two) {
2885 struct diff_tempfile *temp_one, *temp_two;
2886 const char *othername = (other ? other : name);
2887 temp_one = prepare_temp_file(name, one);
2888 temp_two = prepare_temp_file(othername, two);
2889 *arg++ = pgm;
2890 *arg++ = name;
2891 *arg++ = temp_one->name;
2892 *arg++ = temp_one->hex;
2893 *arg++ = temp_one->mode;
2894 *arg++ = temp_two->name;
2895 *arg++ = temp_two->hex;
2896 *arg++ = temp_two->mode;
2897 if (other) {
2898 *arg++ = other;
2899 *arg++ = xfrm_msg;
2900 }
2901 } else {
2902 *arg++ = pgm;
2903 *arg++ = name;
2904 }
2905 *arg = NULL;
2906 fflush(NULL);
2907 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2908 remove_tempfile();
2909 if (retval) {
2910 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2911 exit(1);
2912 }
2913 }
2914
2915 static int similarity_index(struct diff_filepair *p)
2916 {
2917 return p->score * 100 / MAX_SCORE;
2918 }
2919
2920 static void fill_metainfo(struct strbuf *msg,
2921 const char *name,
2922 const char *other,
2923 struct diff_filespec *one,
2924 struct diff_filespec *two,
2925 struct diff_options *o,
2926 struct diff_filepair *p,
2927 int *must_show_header,
2928 int use_color)
2929 {
2930 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2931 const char *reset = diff_get_color(use_color, DIFF_RESET);
2932 struct strbuf *msgbuf;
2933 char *line_prefix = "";
2934
2935 *must_show_header = 1;
2936 if (o->output_prefix) {
2937 msgbuf = o->output_prefix(o, o->output_prefix_data);
2938 line_prefix = msgbuf->buf;
2939 }
2940 strbuf_init(msg, PATH_MAX * 2 + 300);
2941 switch (p->status) {
2942 case DIFF_STATUS_COPIED:
2943 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2944 line_prefix, set, similarity_index(p));
2945 strbuf_addf(msg, "%s\n%s%scopy from ",
2946 reset, line_prefix, set);
2947 quote_c_style(name, msg, NULL, 0);
2948 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2949 quote_c_style(other, msg, NULL, 0);
2950 strbuf_addf(msg, "%s\n", reset);
2951 break;
2952 case DIFF_STATUS_RENAMED:
2953 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2954 line_prefix, set, similarity_index(p));
2955 strbuf_addf(msg, "%s\n%s%srename from ",
2956 reset, line_prefix, set);
2957 quote_c_style(name, msg, NULL, 0);
2958 strbuf_addf(msg, "%s\n%s%srename to ",
2959 reset, line_prefix, set);
2960 quote_c_style(other, msg, NULL, 0);
2961 strbuf_addf(msg, "%s\n", reset);
2962 break;
2963 case DIFF_STATUS_MODIFIED:
2964 if (p->score) {
2965 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2966 line_prefix,
2967 set, similarity_index(p), reset);
2968 break;
2969 }
2970 /* fallthru */
2971 default:
2972 *must_show_header = 0;
2973 }
2974 if (one && two && hashcmp(one->sha1, two->sha1)) {
2975 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2976
2977 if (DIFF_OPT_TST(o, BINARY)) {
2978 mmfile_t mf;
2979 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2980 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2981 abbrev = 40;
2982 }
2983 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2984 find_unique_abbrev(one->sha1, abbrev));
2985 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2986 if (one->mode == two->mode)
2987 strbuf_addf(msg, " %06o", one->mode);
2988 strbuf_addf(msg, "%s\n", reset);
2989 }
2990 }
2991
2992 static void run_diff_cmd(const char *pgm,
2993 const char *name,
2994 const char *other,
2995 const char *attr_path,
2996 struct diff_filespec *one,
2997 struct diff_filespec *two,
2998 struct strbuf *msg,
2999 struct diff_options *o,
3000 struct diff_filepair *p)
3001 {
3002 const char *xfrm_msg = NULL;
3003 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3004 int must_show_header = 0;
3005
3006
3007 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3008 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3009 if (drv && drv->external)
3010 pgm = drv->external;
3011 }
3012
3013 if (msg) {
3014 /*
3015 * don't use colors when the header is intended for an
3016 * external diff driver
3017 */
3018 fill_metainfo(msg, name, other, one, two, o, p,
3019 &must_show_header,
3020 want_color(o->use_color) && !pgm);
3021 xfrm_msg = msg->len ? msg->buf : NULL;
3022 }
3023
3024 if (pgm) {
3025 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3026 complete_rewrite);
3027 return;
3028 }
3029 if (one && two)
3030 builtin_diff(name, other ? other : name,
3031 one, two, xfrm_msg, must_show_header,
3032 o, complete_rewrite);
3033 else
3034 fprintf(o->file, "* Unmerged path %s\n", name);
3035 }
3036
3037 static void diff_fill_sha1_info(struct diff_filespec *one)
3038 {
3039 if (DIFF_FILE_VALID(one)) {
3040 if (!one->sha1_valid) {
3041 struct stat st;
3042 if (one->is_stdin) {
3043 hashcpy(one->sha1, null_sha1);
3044 return;
3045 }
3046 if (lstat(one->path, &st) < 0)
3047 die_errno("stat '%s'", one->path);
3048 if (index_path(one->sha1, one->path, &st, 0))
3049 die("cannot hash %s", one->path);
3050 }
3051 }
3052 else
3053 hashclr(one->sha1);
3054 }
3055
3056 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3057 {
3058 /* Strip the prefix but do not molest /dev/null and absolute paths */
3059 if (*namep && **namep != '/') {
3060 *namep += prefix_length;
3061 if (**namep == '/')
3062 ++*namep;
3063 }
3064 if (*otherp && **otherp != '/') {
3065 *otherp += prefix_length;
3066 if (**otherp == '/')
3067 ++*otherp;
3068 }
3069 }
3070
3071 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3072 {
3073 const char *pgm = external_diff();
3074 struct strbuf msg;
3075 struct diff_filespec *one = p->one;
3076 struct diff_filespec *two = p->two;
3077 const char *name;
3078 const char *other;
3079 const char *attr_path;
3080
3081 name = p->one->path;
3082 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3083 attr_path = name;
3084 if (o->prefix_length)
3085 strip_prefix(o->prefix_length, &name, &other);
3086
3087 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3088 pgm = NULL;
3089
3090 if (DIFF_PAIR_UNMERGED(p)) {
3091 run_diff_cmd(pgm, name, NULL, attr_path,
3092 NULL, NULL, NULL, o, p);
3093 return;
3094 }
3095
3096 diff_fill_sha1_info(one);
3097 diff_fill_sha1_info(two);
3098
3099 if (!pgm &&
3100 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3101 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3102 /*
3103 * a filepair that changes between file and symlink
3104 * needs to be split into deletion and creation.
3105 */
3106 struct diff_filespec *null = alloc_filespec(two->path);
3107 run_diff_cmd(NULL, name, other, attr_path,
3108 one, null, &msg, o, p);
3109 free(null);
3110 strbuf_release(&msg);
3111
3112 null = alloc_filespec(one->path);
3113 run_diff_cmd(NULL, name, other, attr_path,
3114 null, two, &msg, o, p);
3115 free(null);
3116 }
3117 else
3118 run_diff_cmd(pgm, name, other, attr_path,
3119 one, two, &msg, o, p);
3120
3121 strbuf_release(&msg);
3122 }
3123
3124 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3125 struct diffstat_t *diffstat)
3126 {
3127 const char *name;
3128 const char *other;
3129
3130 if (DIFF_PAIR_UNMERGED(p)) {
3131 /* unmerged */
3132 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3133 return;
3134 }
3135
3136 name = p->one->path;
3137 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3138
3139 if (o->prefix_length)
3140 strip_prefix(o->prefix_length, &name, &other);
3141
3142 diff_fill_sha1_info(p->one);
3143 diff_fill_sha1_info(p->two);
3144
3145 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3146 }
3147
3148 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3149 {
3150 const char *name;
3151 const char *other;
3152 const char *attr_path;
3153
3154 if (DIFF_PAIR_UNMERGED(p)) {
3155 /* unmerged */
3156 return;
3157 }
3158
3159 name = p->one->path;
3160 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3161 attr_path = other ? other : name;
3162
3163 if (o->prefix_length)
3164 strip_prefix(o->prefix_length, &name, &other);
3165
3166 diff_fill_sha1_info(p->one);
3167 diff_fill_sha1_info(p->two);
3168
3169 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3170 }
3171
3172 void diff_setup(struct diff_options *options)
3173 {
3174 memcpy(options, &default_diff_options, sizeof(*options));
3175
3176 options->file = stdout;
3177
3178 options->line_termination = '\n';
3179 options->break_opt = -1;
3180 options->rename_limit = -1;
3181 options->dirstat_permille = diff_dirstat_permille_default;
3182 options->context = 3;
3183 DIFF_OPT_SET(options, RENAME_EMPTY);
3184
3185 options->change = diff_change;
3186 options->add_remove = diff_addremove;
3187 options->use_color = diff_use_color_default;
3188 options->detect_rename = diff_detect_rename_default;
3189
3190 if (diff_no_prefix) {
3191 options->a_prefix = options->b_prefix = "";
3192 } else if (!diff_mnemonic_prefix) {
3193 options->a_prefix = "a/";
3194 options->b_prefix = "b/";
3195 }
3196 }
3197
3198 void diff_setup_done(struct diff_options *options)
3199 {
3200 int count = 0;
3201
3202 if (options->output_format & DIFF_FORMAT_NAME)
3203 count++;
3204 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3205 count++;
3206 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3207 count++;
3208 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3209 count++;
3210 if (count > 1)
3211 die("--name-only, --name-status, --check and -s are mutually exclusive");
3212
3213 /*
3214 * Most of the time we can say "there are changes"
3215 * only by checking if there are changed paths, but
3216 * --ignore-whitespace* options force us to look
3217 * inside contents.
3218 */
3219
3220 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3221 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3222 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3223 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3224 else
3225 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3226
3227 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3228 options->detect_rename = DIFF_DETECT_COPY;
3229
3230 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3231 options->prefix = NULL;
3232 if (options->prefix)
3233 options->prefix_length = strlen(options->prefix);
3234 else
3235 options->prefix_length = 0;
3236
3237 if (options->output_format & (DIFF_FORMAT_NAME |
3238 DIFF_FORMAT_NAME_STATUS |
3239 DIFF_FORMAT_CHECKDIFF |
3240 DIFF_FORMAT_NO_OUTPUT))
3241 options->output_format &= ~(DIFF_FORMAT_RAW |
3242 DIFF_FORMAT_NUMSTAT |
3243 DIFF_FORMAT_DIFFSTAT |
3244 DIFF_FORMAT_SHORTSTAT |
3245 DIFF_FORMAT_DIRSTAT |
3246 DIFF_FORMAT_SUMMARY |
3247 DIFF_FORMAT_PATCH);
3248
3249 /*
3250 * These cases always need recursive; we do not drop caller-supplied
3251 * recursive bits for other formats here.
3252 */
3253 if (options->output_format & (DIFF_FORMAT_PATCH |
3254 DIFF_FORMAT_NUMSTAT |
3255 DIFF_FORMAT_DIFFSTAT |
3256 DIFF_FORMAT_SHORTSTAT |
3257 DIFF_FORMAT_DIRSTAT |
3258 DIFF_FORMAT_SUMMARY |
3259 DIFF_FORMAT_CHECKDIFF))
3260 DIFF_OPT_SET(options, RECURSIVE);
3261 /*
3262 * Also pickaxe would not work very well if you do not say recursive
3263 */
3264 if (options->pickaxe)
3265 DIFF_OPT_SET(options, RECURSIVE);
3266 /*
3267 * When patches are generated, submodules diffed against the work tree
3268 * must be checked for dirtiness too so it can be shown in the output
3269 */
3270 if (options->output_format & DIFF_FORMAT_PATCH)
3271 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3272
3273 if (options->detect_rename && options->rename_limit < 0)
3274 options->rename_limit = diff_rename_limit_default;
3275 if (options->setup & DIFF_SETUP_USE_CACHE) {
3276 if (!active_cache)
3277 /* read-cache does not die even when it fails
3278 * so it is safe for us to do this here. Also
3279 * it does not smudge active_cache or active_nr
3280 * when it fails, so we do not have to worry about
3281 * cleaning it up ourselves either.
3282 */
3283 read_cache();
3284 }
3285 if (options->abbrev <= 0 || 40 < options->abbrev)
3286 options->abbrev = 40; /* full */
3287
3288 /*
3289 * It does not make sense to show the first hit we happened
3290 * to have found. It does not make sense not to return with
3291 * exit code in such a case either.
3292 */
3293 if (DIFF_OPT_TST(options, QUICK)) {
3294 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3295 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3296 }
3297 }
3298
3299 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3300 {
3301 char c, *eq;
3302 int len;
3303
3304 if (*arg != '-')
3305 return 0;
3306 c = *++arg;
3307 if (!c)
3308 return 0;
3309 if (c == arg_short) {
3310 c = *++arg;
3311 if (!c)
3312 return 1;
3313 if (val && isdigit(c)) {
3314 char *end;
3315 int n = strtoul(arg, &end, 10);
3316 if (*end)
3317 return 0;
3318 *val = n;
3319 return 1;
3320 }
3321 return 0;
3322 }
3323 if (c != '-')
3324 return 0;
3325 arg++;
3326 eq = strchr(arg, '=');
3327 if (eq)
3328 len = eq - arg;
3329 else
3330 len = strlen(arg);
3331 if (!len || strncmp(arg, arg_long, len))
3332 return 0;
3333 if (eq) {
3334 int n;
3335 char *end;
3336 if (!isdigit(*++eq))
3337 return 0;
3338 n = strtoul(eq, &end, 10);
3339 if (*end)
3340 return 0;
3341 *val = n;
3342 }
3343 return 1;
3344 }
3345
3346 static int diff_scoreopt_parse(const char *opt);
3347
3348 static inline int short_opt(char opt, const char **argv,
3349 const char **optarg)
3350 {
3351 const char *arg = argv[0];
3352 if (arg[0] != '-' || arg[1] != opt)
3353 return 0;
3354 if (arg[2] != '\0') {
3355 *optarg = arg + 2;
3356 return 1;
3357 }
3358 if (!argv[1])
3359 die("Option '%c' requires a value", opt);
3360 *optarg = argv[1];
3361 return 2;
3362 }
3363
3364 int parse_long_opt(const char *opt, const char **argv,
3365 const char **optarg)
3366 {
3367 const char *arg = argv[0];
3368 if (arg[0] != '-' || arg[1] != '-')
3369 return 0;
3370 arg += strlen("--");
3371 if (prefixcmp(arg, opt))
3372 return 0;
3373 arg += strlen(opt);
3374 if (*arg == '=') { /* sticked form: --option=value */
3375 *optarg = arg + 1;
3376 return 1;
3377 }
3378 if (*arg != '\0')
3379 return 0;
3380 /* separate form: --option value */
3381 if (!argv[1])
3382 die("Option '--%s' requires a value", opt);
3383 *optarg = argv[1];
3384 return 2;
3385 }
3386
3387 static int stat_opt(struct diff_options *options, const char **av)
3388 {
3389 const char *arg = av[0];
3390 char *end;
3391 int width = options->stat_width;
3392 int name_width = options->stat_name_width;
3393 int graph_width = options->stat_graph_width;
3394 int count = options->stat_count;
3395 int argcount = 1;
3396
3397 arg += strlen("--stat");
3398 end = (char *)arg;
3399
3400 switch (*arg) {
3401 case '-':
3402 if (!prefixcmp(arg, "-width")) {
3403 arg += strlen("-width");
3404 if (*arg == '=')
3405 width = strtoul(arg + 1, &end, 10);
3406 else if (!*arg && !av[1])
3407 die("Option '--stat-width' requires a value");
3408 else if (!*arg) {
3409 width = strtoul(av[1], &end, 10);
3410 argcount = 2;
3411 }
3412 } else if (!prefixcmp(arg, "-name-width")) {
3413 arg += strlen("-name-width");
3414 if (*arg == '=')
3415 name_width = strtoul(arg + 1, &end, 10);
3416 else if (!*arg && !av[1])
3417 die("Option '--stat-name-width' requires a value");
3418 else if (!*arg) {
3419 name_width = strtoul(av[1], &end, 10);
3420 argcount = 2;
3421 }
3422 } else if (!prefixcmp(arg, "-graph-width")) {
3423 arg += strlen("-graph-width");
3424 if (*arg == '=')
3425 graph_width = strtoul(arg + 1, &end, 10);
3426 else if (!*arg && !av[1])
3427 die("Option '--stat-graph-width' requires a value");
3428 else if (!*arg) {
3429 graph_width = strtoul(av[1], &end, 10);
3430 argcount = 2;
3431 }
3432 } else if (!prefixcmp(arg, "-count")) {
3433 arg += strlen("-count");
3434 if (*arg == '=')
3435 count = strtoul(arg + 1, &end, 10);
3436 else if (!*arg && !av[1])
3437 die("Option '--stat-count' requires a value");
3438 else if (!*arg) {
3439 count = strtoul(av[1], &end, 10);
3440 argcount = 2;
3441 }
3442 }
3443 break;
3444 case '=':
3445 width = strtoul(arg+1, &end, 10);
3446 if (*end == ',')
3447 name_width = strtoul(end+1, &end, 10);
3448 if (*end == ',')
3449 count = strtoul(end+1, &end, 10);
3450 }
3451
3452 /* Important! This checks all the error cases! */
3453 if (*end)
3454 return 0;
3455 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3456 options->stat_name_width = name_width;
3457 options->stat_graph_width = graph_width;
3458 options->stat_width = width;
3459 options->stat_count = count;
3460 return argcount;
3461 }
3462
3463 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3464 {
3465 struct strbuf errmsg = STRBUF_INIT;
3466 if (parse_dirstat_params(options, params, &errmsg))
3467 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3468 errmsg.buf);
3469 strbuf_release(&errmsg);
3470 /*
3471 * The caller knows a dirstat-related option is given from the command
3472 * line; allow it to say "return this_function();"
3473 */
3474 options->output_format |= DIFF_FORMAT_DIRSTAT;
3475 return 1;
3476 }
3477
3478 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3479 {
3480 const char *arg = av[0];
3481 const char *optarg;
3482 int argcount;
3483
3484 /* Output format options */
3485 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3486 options->output_format |= DIFF_FORMAT_PATCH;
3487 else if (opt_arg(arg, 'U', "unified", &options->context))
3488 options->output_format |= DIFF_FORMAT_PATCH;
3489 else if (!strcmp(arg, "--raw"))
3490 options->output_format |= DIFF_FORMAT_RAW;
3491 else if (!strcmp(arg, "--patch-with-raw"))
3492 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3493 else if (!strcmp(arg, "--numstat"))
3494 options->output_format |= DIFF_FORMAT_NUMSTAT;
3495 else if (!strcmp(arg, "--shortstat"))
3496 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3497 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3498 return parse_dirstat_opt(options, "");
3499 else if (!prefixcmp(arg, "-X"))
3500 return parse_dirstat_opt(options, arg + 2);
3501 else if (!prefixcmp(arg, "--dirstat="))
3502 return parse_dirstat_opt(options, arg + 10);
3503 else if (!strcmp(arg, "--cumulative"))
3504 return parse_dirstat_opt(options, "cumulative");
3505 else if (!strcmp(arg, "--dirstat-by-file"))
3506 return parse_dirstat_opt(options, "files");
3507 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3508 parse_dirstat_opt(options, "files");
3509 return parse_dirstat_opt(options, arg + 18);
3510 }
3511 else if (!strcmp(arg, "--check"))
3512 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3513 else if (!strcmp(arg, "--summary"))
3514 options->output_format |= DIFF_FORMAT_SUMMARY;
3515 else if (!strcmp(arg, "--patch-with-stat"))
3516 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3517 else if (!strcmp(arg, "--name-only"))
3518 options->output_format |= DIFF_FORMAT_NAME;
3519 else if (!strcmp(arg, "--name-status"))
3520 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3521 else if (!strcmp(arg, "-s"))
3522 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3523 else if (!prefixcmp(arg, "--stat"))
3524 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3525 return stat_opt(options, av);
3526
3527 /* renames options */
3528 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3529 !strcmp(arg, "--break-rewrites")) {
3530 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3531 return error("invalid argument to -B: %s", arg+2);
3532 }
3533 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3534 !strcmp(arg, "--find-renames")) {
3535 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3536 return error("invalid argument to -M: %s", arg+2);
3537 options->detect_rename = DIFF_DETECT_RENAME;
3538 }
3539 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3540 options->irreversible_delete = 1;
3541 }
3542 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3543 !strcmp(arg, "--find-copies")) {
3544 if (options->detect_rename == DIFF_DETECT_COPY)
3545 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3546 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3547 return error("invalid argument to -C: %s", arg+2);
3548 options->detect_rename = DIFF_DETECT_COPY;
3549 }
3550 else if (!strcmp(arg, "--no-renames"))
3551 options->detect_rename = 0;
3552 else if (!strcmp(arg, "--rename-empty"))
3553 DIFF_OPT_SET(options, RENAME_EMPTY);
3554 else if (!strcmp(arg, "--no-rename-empty"))
3555 DIFF_OPT_CLR(options, RENAME_EMPTY);
3556 else if (!strcmp(arg, "--relative"))
3557 DIFF_OPT_SET(options, RELATIVE_NAME);
3558 else if (!prefixcmp(arg, "--relative=")) {
3559 DIFF_OPT_SET(options, RELATIVE_NAME);
3560 options->prefix = arg + 11;
3561 }
3562
3563 /* xdiff options */
3564 else if (!strcmp(arg, "--minimal"))
3565 DIFF_XDL_SET(options, NEED_MINIMAL);
3566 else if (!strcmp(arg, "--no-minimal"))
3567 DIFF_XDL_CLR(options, NEED_MINIMAL);
3568 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3569 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3570 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3571 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3572 else if (!strcmp(arg, "--ignore-space-at-eol"))
3573 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3574 else if (!strcmp(arg, "--patience"))
3575 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3576 else if (!strcmp(arg, "--histogram"))
3577 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3578
3579 /* flags options */
3580 else if (!strcmp(arg, "--binary")) {
3581 options->output_format |= DIFF_FORMAT_PATCH;
3582 DIFF_OPT_SET(options, BINARY);
3583 }
3584 else if (!strcmp(arg, "--full-index"))
3585 DIFF_OPT_SET(options, FULL_INDEX);
3586 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3587 DIFF_OPT_SET(options, TEXT);
3588 else if (!strcmp(arg, "-R"))
3589 DIFF_OPT_SET(options, REVERSE_DIFF);
3590 else if (!strcmp(arg, "--find-copies-harder"))
3591 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3592 else if (!strcmp(arg, "--follow"))
3593 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3594 else if (!strcmp(arg, "--color"))
3595 options->use_color = 1;
3596 else if (!prefixcmp(arg, "--color=")) {
3597 int value = git_config_colorbool(NULL, arg+8);
3598 if (value < 0)
3599 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3600 options->use_color = value;
3601 }
3602 else if (!strcmp(arg, "--no-color"))
3603 options->use_color = 0;
3604 else if (!strcmp(arg, "--color-words")) {
3605 options->use_color = 1;
3606 options->word_diff = DIFF_WORDS_COLOR;
3607 }
3608 else if (!prefixcmp(arg, "--color-words=")) {
3609 options->use_color = 1;
3610 options->word_diff = DIFF_WORDS_COLOR;
3611 options->word_regex = arg + 14;
3612 }
3613 else if (!strcmp(arg, "--word-diff")) {
3614 if (options->word_diff == DIFF_WORDS_NONE)
3615 options->word_diff = DIFF_WORDS_PLAIN;
3616 }
3617 else if (!prefixcmp(arg, "--word-diff=")) {
3618 const char *type = arg + 12;
3619 if (!strcmp(type, "plain"))
3620 options->word_diff = DIFF_WORDS_PLAIN;
3621 else if (!strcmp(type, "color")) {
3622 options->use_color = 1;
3623 options->word_diff = DIFF_WORDS_COLOR;
3624 }
3625 else if (!strcmp(type, "porcelain"))
3626 options->word_diff = DIFF_WORDS_PORCELAIN;
3627 else if (!strcmp(type, "none"))
3628 options->word_diff = DIFF_WORDS_NONE;
3629 else
3630 die("bad --word-diff argument: %s", type);
3631 }
3632 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3633 if (options->word_diff == DIFF_WORDS_NONE)
3634 options->word_diff = DIFF_WORDS_PLAIN;
3635 options->word_regex = optarg;
3636 return argcount;
3637 }
3638 else if (!strcmp(arg, "--exit-code"))
3639 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3640 else if (!strcmp(arg, "--quiet"))
3641 DIFF_OPT_SET(options, QUICK);
3642 else if (!strcmp(arg, "--ext-diff"))
3643 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3644 else if (!strcmp(arg, "--no-ext-diff"))
3645 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3646 else if (!strcmp(arg, "--textconv"))
3647 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3648 else if (!strcmp(arg, "--no-textconv"))
3649 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3650 else if (!strcmp(arg, "--ignore-submodules")) {
3651 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3652 handle_ignore_submodules_arg(options, "all");
3653 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3654 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3655 handle_ignore_submodules_arg(options, arg + 20);
3656 } else if (!strcmp(arg, "--submodule"))
3657 DIFF_OPT_SET(options, SUBMODULE_LOG);
3658 else if (!prefixcmp(arg, "--submodule=")) {
3659 if (!strcmp(arg + 12, "log"))
3660 DIFF_OPT_SET(options, SUBMODULE_LOG);
3661 }
3662
3663 /* misc options */
3664 else if (!strcmp(arg, "-z"))
3665 options->line_termination = 0;
3666 else if ((argcount = short_opt('l', av, &optarg))) {
3667 options->rename_limit = strtoul(optarg, NULL, 10);
3668 return argcount;
3669 }
3670 else if ((argcount = short_opt('S', av, &optarg))) {
3671 options->pickaxe = optarg;
3672 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3673 return argcount;
3674 } else if ((argcount = short_opt('G', av, &optarg))) {
3675 options->pickaxe = optarg;
3676 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3677 return argcount;
3678 }
3679 else if (!strcmp(arg, "--pickaxe-all"))
3680 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3681 else if (!strcmp(arg, "--pickaxe-regex"))
3682 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3683 else if ((argcount = short_opt('O', av, &optarg))) {
3684 options->orderfile = optarg;
3685 return argcount;
3686 }
3687 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3688 options->filter = optarg;
3689 return argcount;
3690 }
3691 else if (!strcmp(arg, "--abbrev"))
3692 options->abbrev = DEFAULT_ABBREV;
3693 else if (!prefixcmp(arg, "--abbrev=")) {
3694 options->abbrev = strtoul(arg + 9, NULL, 10);
3695 if (options->abbrev < MINIMUM_ABBREV)
3696 options->abbrev = MINIMUM_ABBREV;
3697 else if (40 < options->abbrev)
3698 options->abbrev = 40;
3699 }
3700 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3701 options->a_prefix = optarg;
3702 return argcount;
3703 }
3704 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3705 options->b_prefix = optarg;
3706 return argcount;
3707 }
3708 else if (!strcmp(arg, "--no-prefix"))
3709 options->a_prefix = options->b_prefix = "";
3710 else if (opt_arg(arg, '\0', "inter-hunk-context",
3711 &options->interhunkcontext))
3712 ;
3713 else if (!strcmp(arg, "-W"))
3714 DIFF_OPT_SET(options, FUNCCONTEXT);
3715 else if (!strcmp(arg, "--function-context"))
3716 DIFF_OPT_SET(options, FUNCCONTEXT);
3717 else if (!strcmp(arg, "--no-function-context"))
3718 DIFF_OPT_CLR(options, FUNCCONTEXT);
3719 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3720 options->file = fopen(optarg, "w");
3721 if (!options->file)
3722 die_errno("Could not open '%s'", optarg);
3723 options->close_file = 1;
3724 return argcount;
3725 } else
3726 return 0;
3727 return 1;
3728 }
3729
3730 int parse_rename_score(const char **cp_p)
3731 {
3732 unsigned long num, scale;
3733 int ch, dot;
3734 const char *cp = *cp_p;
3735
3736 num = 0;
3737 scale = 1;
3738 dot = 0;
3739 for (;;) {
3740 ch = *cp;
3741 if ( !dot && ch == '.' ) {
3742 scale = 1;
3743 dot = 1;
3744 } else if ( ch == '%' ) {
3745 scale = dot ? scale*100 : 100;
3746 cp++; /* % is always at the end */
3747 break;
3748 } else if ( ch >= '0' && ch <= '9' ) {
3749 if ( scale < 100000 ) {
3750 scale *= 10;
3751 num = (num*10) + (ch-'0');
3752 }
3753 } else {
3754 break;
3755 }
3756 cp++;
3757 }
3758 *cp_p = cp;
3759
3760 /* user says num divided by scale and we say internally that
3761 * is MAX_SCORE * num / scale.
3762 */
3763 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3764 }
3765
3766 static int diff_scoreopt_parse(const char *opt)
3767 {
3768 int opt1, opt2, cmd;
3769
3770 if (*opt++ != '-')
3771 return -1;
3772 cmd = *opt++;
3773 if (cmd == '-') {
3774 /* convert the long-form arguments into short-form versions */
3775 if (!prefixcmp(opt, "break-rewrites")) {
3776 opt += strlen("break-rewrites");
3777 if (*opt == 0 || *opt++ == '=')
3778 cmd = 'B';
3779 } else if (!prefixcmp(opt, "find-copies")) {
3780 opt += strlen("find-copies");
3781 if (*opt == 0 || *opt++ == '=')
3782 cmd = 'C';
3783 } else if (!prefixcmp(opt, "find-renames")) {
3784 opt += strlen("find-renames");
3785 if (*opt == 0 || *opt++ == '=')
3786 cmd = 'M';
3787 }
3788 }
3789 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3790 return -1; /* that is not a -M, -C nor -B option */
3791
3792 opt1 = parse_rename_score(&opt);
3793 if (cmd != 'B')
3794 opt2 = 0;
3795 else {
3796 if (*opt == 0)
3797 opt2 = 0;
3798 else if (*opt != '/')
3799 return -1; /* we expect -B80/99 or -B80 */
3800 else {
3801 opt++;
3802 opt2 = parse_rename_score(&opt);
3803 }
3804 }
3805 if (*opt != 0)
3806 return -1;
3807 return opt1 | (opt2 << 16);
3808 }
3809
3810 struct diff_queue_struct diff_queued_diff;
3811
3812 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3813 {
3814 if (queue->alloc <= queue->nr) {
3815 queue->alloc = alloc_nr(queue->alloc);
3816 queue->queue = xrealloc(queue->queue,
3817 sizeof(dp) * queue->alloc);
3818 }
3819 queue->queue[queue->nr++] = dp;
3820 }
3821
3822 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3823 struct diff_filespec *one,
3824 struct diff_filespec *two)
3825 {
3826 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3827 dp->one = one;
3828 dp->two = two;
3829 if (queue)
3830 diff_q(queue, dp);
3831 return dp;
3832 }
3833
3834 void diff_free_filepair(struct diff_filepair *p)
3835 {
3836 free_filespec(p->one);
3837 free_filespec(p->two);
3838 free(p);
3839 }
3840
3841 /* This is different from find_unique_abbrev() in that
3842 * it stuffs the result with dots for alignment.
3843 */
3844 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3845 {
3846 int abblen;
3847 const char *abbrev;
3848 if (len == 40)
3849 return sha1_to_hex(sha1);
3850
3851 abbrev = find_unique_abbrev(sha1, len);
3852 abblen = strlen(abbrev);
3853 if (abblen < 37) {
3854 static char hex[41];
3855 if (len < abblen && abblen <= len + 2)
3856 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3857 else
3858 sprintf(hex, "%s...", abbrev);
3859 return hex;
3860 }
3861 return sha1_to_hex(sha1);
3862 }
3863
3864 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3865 {
3866 int line_termination = opt->line_termination;
3867 int inter_name_termination = line_termination ? '\t' : '\0';
3868 if (opt->output_prefix) {
3869 struct strbuf *msg = NULL;
3870 msg = opt->output_prefix(opt, opt->output_prefix_data);
3871 fprintf(opt->file, "%s", msg->buf);
3872 }
3873
3874 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3875 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3876 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3877 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3878 }
3879 if (p->score) {
3880 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3881 inter_name_termination);
3882 } else {
3883 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3884 }
3885
3886 if (p->status == DIFF_STATUS_COPIED ||
3887 p->status == DIFF_STATUS_RENAMED) {
3888 const char *name_a, *name_b;
3889 name_a = p->one->path;
3890 name_b = p->two->path;
3891 strip_prefix(opt->prefix_length, &name_a, &name_b);
3892 write_name_quoted(name_a, opt->file, inter_name_termination);
3893 write_name_quoted(name_b, opt->file, line_termination);
3894 } else {
3895 const char *name_a, *name_b;
3896 name_a = p->one->mode ? p->one->path : p->two->path;
3897 name_b = NULL;
3898 strip_prefix(opt->prefix_length, &name_a, &name_b);
3899 write_name_quoted(name_a, opt->file, line_termination);
3900 }
3901 }
3902
3903 int diff_unmodified_pair(struct diff_filepair *p)
3904 {
3905 /* This function is written stricter than necessary to support
3906 * the currently implemented transformers, but the idea is to
3907 * let transformers to produce diff_filepairs any way they want,
3908 * and filter and clean them up here before producing the output.
3909 */
3910 struct diff_filespec *one = p->one, *two = p->two;
3911
3912 if (DIFF_PAIR_UNMERGED(p))
3913 return 0; /* unmerged is interesting */
3914
3915 /* deletion, addition, mode or type change
3916 * and rename are all interesting.
3917 */
3918 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3919 DIFF_PAIR_MODE_CHANGED(p) ||
3920 strcmp(one->path, two->path))
3921 return 0;
3922
3923 /* both are valid and point at the same path. that is, we are
3924 * dealing with a change.
3925 */
3926 if (one->sha1_valid && two->sha1_valid &&
3927 !hashcmp(one->sha1, two->sha1) &&
3928 !one->dirty_submodule && !two->dirty_submodule)
3929 return 1; /* no change */
3930 if (!one->sha1_valid && !two->sha1_valid)
3931 return 1; /* both look at the same file on the filesystem. */
3932 return 0;
3933 }
3934
3935 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3936 {
3937 if (diff_unmodified_pair(p))
3938 return;
3939
3940 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3941 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3942 return; /* no tree diffs in patch format */
3943
3944 run_diff(p, o);
3945 }
3946
3947 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3948 struct diffstat_t *diffstat)
3949 {
3950 if (diff_unmodified_pair(p))
3951 return;
3952
3953 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3954 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3955 return; /* no useful stat for tree diffs */
3956
3957 run_diffstat(p, o, diffstat);
3958 }
3959
3960 static void diff_flush_checkdiff(struct diff_filepair *p,
3961 struct diff_options *o)
3962 {
3963 if (diff_unmodified_pair(p))
3964 return;
3965
3966 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3967 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3968 return; /* nothing to check in tree diffs */
3969
3970 run_checkdiff(p, o);
3971 }
3972
3973 int diff_queue_is_empty(void)
3974 {
3975 struct diff_queue_struct *q = &diff_queued_diff;
3976 int i;
3977 for (i = 0; i < q->nr; i++)
3978 if (!diff_unmodified_pair(q->queue[i]))
3979 return 0;
3980 return 1;
3981 }
3982
3983 #if DIFF_DEBUG
3984 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3985 {
3986 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3987 x, one ? one : "",
3988 s->path,
3989 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3990 s->mode,
3991 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3992 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3993 x, one ? one : "",
3994 s->size, s->xfrm_flags);
3995 }
3996
3997 void diff_debug_filepair(const struct diff_filepair *p, int i)
3998 {
3999 diff_debug_filespec(p->one, i, "one");
4000 diff_debug_filespec(p->two, i, "two");
4001 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4002 p->score, p->status ? p->status : '?',
4003 p->one->rename_used, p->broken_pair);
4004 }
4005
4006 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4007 {
4008 int i;
4009 if (msg)
4010 fprintf(stderr, "%s\n", msg);
4011 fprintf(stderr, "q->nr = %d\n", q->nr);
4012 for (i = 0; i < q->nr; i++) {
4013 struct diff_filepair *p = q->queue[i];
4014 diff_debug_filepair(p, i);
4015 }
4016 }
4017 #endif
4018
4019 static void diff_resolve_rename_copy(void)
4020 {
4021 int i;
4022 struct diff_filepair *p;
4023 struct diff_queue_struct *q = &diff_queued_diff;
4024
4025 diff_debug_queue("resolve-rename-copy", q);
4026
4027 for (i = 0; i < q->nr; i++) {
4028 p = q->queue[i];
4029 p->status = 0; /* undecided */
4030 if (DIFF_PAIR_UNMERGED(p))
4031 p->status = DIFF_STATUS_UNMERGED;
4032 else if (!DIFF_FILE_VALID(p->one))
4033 p->status = DIFF_STATUS_ADDED;
4034 else if (!DIFF_FILE_VALID(p->two))
4035 p->status = DIFF_STATUS_DELETED;
4036 else if (DIFF_PAIR_TYPE_CHANGED(p))
4037 p->status = DIFF_STATUS_TYPE_CHANGED;
4038
4039 /* from this point on, we are dealing with a pair
4040 * whose both sides are valid and of the same type, i.e.
4041 * either in-place edit or rename/copy edit.
4042 */
4043 else if (DIFF_PAIR_RENAME(p)) {
4044 /*
4045 * A rename might have re-connected a broken
4046 * pair up, causing the pathnames to be the
4047 * same again. If so, that's not a rename at
4048 * all, just a modification..
4049 *
4050 * Otherwise, see if this source was used for
4051 * multiple renames, in which case we decrement
4052 * the count, and call it a copy.
4053 */
4054 if (!strcmp(p->one->path, p->two->path))
4055 p->status = DIFF_STATUS_MODIFIED;
4056 else if (--p->one->rename_used > 0)
4057 p->status = DIFF_STATUS_COPIED;
4058 else
4059 p->status = DIFF_STATUS_RENAMED;
4060 }
4061 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4062 p->one->mode != p->two->mode ||
4063 p->one->dirty_submodule ||
4064 p->two->dirty_submodule ||
4065 is_null_sha1(p->one->sha1))
4066 p->status = DIFF_STATUS_MODIFIED;
4067 else {
4068 /* This is a "no-change" entry and should not
4069 * happen anymore, but prepare for broken callers.
4070 */
4071 error("feeding unmodified %s to diffcore",
4072 p->one->path);
4073 p->status = DIFF_STATUS_UNKNOWN;
4074 }
4075 }
4076 diff_debug_queue("resolve-rename-copy done", q);
4077 }
4078
4079 static int check_pair_status(struct diff_filepair *p)
4080 {
4081 switch (p->status) {
4082 case DIFF_STATUS_UNKNOWN:
4083 return 0;
4084 case 0:
4085 die("internal error in diff-resolve-rename-copy");
4086 default:
4087 return 1;
4088 }
4089 }
4090
4091 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4092 {
4093 int fmt = opt->output_format;
4094
4095 if (fmt & DIFF_FORMAT_CHECKDIFF)
4096 diff_flush_checkdiff(p, opt);
4097 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4098 diff_flush_raw(p, opt);
4099 else if (fmt & DIFF_FORMAT_NAME) {
4100 const char *name_a, *name_b;
4101 name_a = p->two->path;
4102 name_b = NULL;
4103 strip_prefix(opt->prefix_length, &name_a, &name_b);
4104 write_name_quoted(name_a, opt->file, opt->line_termination);
4105 }
4106 }
4107
4108 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4109 {
4110 if (fs->mode)
4111 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4112 else
4113 fprintf(file, " %s ", newdelete);
4114 write_name_quoted(fs->path, file, '\n');
4115 }
4116
4117
4118 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4119 const char *line_prefix)
4120 {
4121 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4122 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4123 p->two->mode, show_name ? ' ' : '\n');
4124 if (show_name) {
4125 write_name_quoted(p->two->path, file, '\n');
4126 }
4127 }
4128 }
4129
4130 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4131 const char *line_prefix)
4132 {
4133 char *names = pprint_rename(p->one->path, p->two->path);
4134
4135 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4136 free(names);
4137 show_mode_change(file, p, 0, line_prefix);
4138 }
4139
4140 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4141 {
4142 FILE *file = opt->file;
4143 char *line_prefix = "";
4144
4145 if (opt->output_prefix) {
4146 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4147 line_prefix = buf->buf;
4148 }
4149
4150 switch(p->status) {
4151 case DIFF_STATUS_DELETED:
4152 fputs(line_prefix, file);
4153 show_file_mode_name(file, "delete", p->one);
4154 break;
4155 case DIFF_STATUS_ADDED:
4156 fputs(line_prefix, file);
4157 show_file_mode_name(file, "create", p->two);
4158 break;
4159 case DIFF_STATUS_COPIED:
4160 fputs(line_prefix, file);
4161 show_rename_copy(file, "copy", p, line_prefix);
4162 break;
4163 case DIFF_STATUS_RENAMED:
4164 fputs(line_prefix, file);
4165 show_rename_copy(file, "rename", p, line_prefix);
4166 break;
4167 default:
4168 if (p->score) {
4169 fprintf(file, "%s rewrite ", line_prefix);
4170 write_name_quoted(p->two->path, file, ' ');
4171 fprintf(file, "(%d%%)\n", similarity_index(p));
4172 }
4173 show_mode_change(file, p, !p->score, line_prefix);
4174 break;
4175 }
4176 }
4177
4178 struct patch_id_t {
4179 git_SHA_CTX *ctx;
4180 int patchlen;
4181 };
4182
4183 static int remove_space(char *line, int len)
4184 {
4185 int i;
4186 char *dst = line;
4187 unsigned char c;
4188
4189 for (i = 0; i < len; i++)
4190 if (!isspace((c = line[i])))
4191 *dst++ = c;
4192
4193 return dst - line;
4194 }
4195
4196 static void patch_id_consume(void *priv, char *line, unsigned long len)
4197 {
4198 struct patch_id_t *data = priv;
4199 int new_len;
4200
4201 /* Ignore line numbers when computing the SHA1 of the patch */
4202 if (!prefixcmp(line, "@@ -"))
4203 return;
4204
4205 new_len = remove_space(line, len);
4206
4207 git_SHA1_Update(data->ctx, line, new_len);
4208 data->patchlen += new_len;
4209 }
4210
4211 /* returns 0 upon success, and writes result into sha1 */
4212 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4213 {
4214 struct diff_queue_struct *q = &diff_queued_diff;
4215 int i;
4216 git_SHA_CTX ctx;
4217 struct patch_id_t data;
4218 char buffer[PATH_MAX * 4 + 20];
4219
4220 git_SHA1_Init(&ctx);
4221 memset(&data, 0, sizeof(struct patch_id_t));
4222 data.ctx = &ctx;
4223
4224 for (i = 0; i < q->nr; i++) {
4225 xpparam_t xpp;
4226 xdemitconf_t xecfg;
4227 mmfile_t mf1, mf2;
4228 struct diff_filepair *p = q->queue[i];
4229 int len1, len2;
4230
4231 memset(&xpp, 0, sizeof(xpp));
4232 memset(&xecfg, 0, sizeof(xecfg));
4233 if (p->status == 0)
4234 return error("internal diff status error");
4235 if (p->status == DIFF_STATUS_UNKNOWN)
4236 continue;
4237 if (diff_unmodified_pair(p))
4238 continue;
4239 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4240 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4241 continue;
4242 if (DIFF_PAIR_UNMERGED(p))
4243 continue;
4244
4245 diff_fill_sha1_info(p->one);
4246 diff_fill_sha1_info(p->two);
4247 if (fill_mmfile(&mf1, p->one) < 0 ||
4248 fill_mmfile(&mf2, p->two) < 0)
4249 return error("unable to read files to diff");
4250
4251 len1 = remove_space(p->one->path, strlen(p->one->path));
4252 len2 = remove_space(p->two->path, strlen(p->two->path));
4253 if (p->one->mode == 0)
4254 len1 = snprintf(buffer, sizeof(buffer),
4255 "diff--gita/%.*sb/%.*s"
4256 "newfilemode%06o"
4257 "---/dev/null"
4258 "+++b/%.*s",
4259 len1, p->one->path,
4260 len2, p->two->path,
4261 p->two->mode,
4262 len2, p->two->path);
4263 else if (p->two->mode == 0)
4264 len1 = snprintf(buffer, sizeof(buffer),
4265 "diff--gita/%.*sb/%.*s"
4266 "deletedfilemode%06o"
4267 "---a/%.*s"
4268 "+++/dev/null",
4269 len1, p->one->path,
4270 len2, p->two->path,
4271 p->one->mode,
4272 len1, p->one->path);
4273 else
4274 len1 = snprintf(buffer, sizeof(buffer),
4275 "diff--gita/%.*sb/%.*s"
4276 "---a/%.*s"
4277 "+++b/%.*s",
4278 len1, p->one->path,
4279 len2, p->two->path,
4280 len1, p->one->path,
4281 len2, p->two->path);
4282 git_SHA1_Update(&ctx, buffer, len1);
4283
4284 if (diff_filespec_is_binary(p->one) ||
4285 diff_filespec_is_binary(p->two)) {
4286 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4287 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4288 continue;
4289 }
4290
4291 xpp.flags = 0;
4292 xecfg.ctxlen = 3;
4293 xecfg.flags = 0;
4294 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4295 &xpp, &xecfg);
4296 }
4297
4298 git_SHA1_Final(sha1, &ctx);
4299 return 0;
4300 }
4301
4302 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4303 {
4304 struct diff_queue_struct *q = &diff_queued_diff;
4305 int i;
4306 int result = diff_get_patch_id(options, sha1);
4307
4308 for (i = 0; i < q->nr; i++)
4309 diff_free_filepair(q->queue[i]);
4310
4311 free(q->queue);
4312 DIFF_QUEUE_CLEAR(q);
4313
4314 return result;
4315 }
4316
4317 static int is_summary_empty(const struct diff_queue_struct *q)
4318 {
4319 int i;
4320
4321 for (i = 0; i < q->nr; i++) {
4322 const struct diff_filepair *p = q->queue[i];
4323
4324 switch (p->status) {
4325 case DIFF_STATUS_DELETED:
4326 case DIFF_STATUS_ADDED:
4327 case DIFF_STATUS_COPIED:
4328 case DIFF_STATUS_RENAMED:
4329 return 0;
4330 default:
4331 if (p->score)
4332 return 0;
4333 if (p->one->mode && p->two->mode &&
4334 p->one->mode != p->two->mode)
4335 return 0;
4336 break;
4337 }
4338 }
4339 return 1;
4340 }
4341
4342 static const char rename_limit_warning[] =
4343 "inexact rename detection was skipped due to too many files.";
4344
4345 static const char degrade_cc_to_c_warning[] =
4346 "only found copies from modified paths due to too many files.";
4347
4348 static const char rename_limit_advice[] =
4349 "you may want to set your %s variable to at least "
4350 "%d and retry the command.";
4351
4352 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4353 {
4354 if (degraded_cc)
4355 warning(degrade_cc_to_c_warning);
4356 else if (needed)
4357 warning(rename_limit_warning);
4358 else
4359 return;
4360 if (0 < needed && needed < 32767)
4361 warning(rename_limit_advice, varname, needed);
4362 }
4363
4364 void diff_flush(struct diff_options *options)
4365 {
4366 struct diff_queue_struct *q = &diff_queued_diff;
4367 int i, output_format = options->output_format;
4368 int separator = 0;
4369 int dirstat_by_line = 0;
4370
4371 /*
4372 * Order: raw, stat, summary, patch
4373 * or: name/name-status/checkdiff (other bits clear)
4374 */
4375 if (!q->nr)
4376 goto free_queue;
4377
4378 if (output_format & (DIFF_FORMAT_RAW |
4379 DIFF_FORMAT_NAME |
4380 DIFF_FORMAT_NAME_STATUS |
4381 DIFF_FORMAT_CHECKDIFF)) {
4382 for (i = 0; i < q->nr; i++) {
4383 struct diff_filepair *p = q->queue[i];
4384 if (check_pair_status(p))
4385 flush_one_pair(p, options);
4386 }
4387 separator++;
4388 }
4389
4390 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4391 dirstat_by_line = 1;
4392
4393 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4394 dirstat_by_line) {
4395 struct diffstat_t diffstat;
4396
4397 memset(&diffstat, 0, sizeof(struct diffstat_t));
4398 for (i = 0; i < q->nr; i++) {
4399 struct diff_filepair *p = q->queue[i];
4400 if (check_pair_status(p))
4401 diff_flush_stat(p, options, &diffstat);
4402 }
4403 if (output_format & DIFF_FORMAT_NUMSTAT)
4404 show_numstat(&diffstat, options);
4405 if (output_format & DIFF_FORMAT_DIFFSTAT)
4406 show_stats(&diffstat, options);
4407 if (output_format & DIFF_FORMAT_SHORTSTAT)
4408 show_shortstats(&diffstat, options);
4409 if (output_format & DIFF_FORMAT_DIRSTAT)
4410 show_dirstat_by_line(&diffstat, options);
4411 free_diffstat_info(&diffstat);
4412 separator++;
4413 }
4414 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4415 show_dirstat(options);
4416
4417 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4418 for (i = 0; i < q->nr; i++) {
4419 diff_summary(options, q->queue[i]);
4420 }
4421 separator++;
4422 }
4423
4424 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4425 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4426 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4427 /*
4428 * run diff_flush_patch for the exit status. setting
4429 * options->file to /dev/null should be safe, becaue we
4430 * aren't supposed to produce any output anyway.
4431 */
4432 if (options->close_file)
4433 fclose(options->file);
4434 options->file = fopen("/dev/null", "w");
4435 if (!options->file)
4436 die_errno("Could not open /dev/null");
4437 options->close_file = 1;
4438 for (i = 0; i < q->nr; i++) {
4439 struct diff_filepair *p = q->queue[i];
4440 if (check_pair_status(p))
4441 diff_flush_patch(p, options);
4442 if (options->found_changes)
4443 break;
4444 }
4445 }
4446
4447 if (output_format & DIFF_FORMAT_PATCH) {
4448 if (separator) {
4449 if (options->output_prefix) {
4450 struct strbuf *msg = NULL;
4451 msg = options->output_prefix(options,
4452 options->output_prefix_data);
4453 fwrite(msg->buf, msg->len, 1, stdout);
4454 }
4455 putc(options->line_termination, options->file);
4456 if (options->stat_sep) {
4457 /* attach patch instead of inline */
4458 fputs(options->stat_sep, options->file);
4459 }
4460 }
4461
4462 for (i = 0; i < q->nr; i++) {
4463 struct diff_filepair *p = q->queue[i];
4464 if (check_pair_status(p))
4465 diff_flush_patch(p, options);
4466 }
4467 }
4468
4469 if (output_format & DIFF_FORMAT_CALLBACK)
4470 options->format_callback(q, options, options->format_callback_data);
4471
4472 for (i = 0; i < q->nr; i++)
4473 diff_free_filepair(q->queue[i]);
4474 free_queue:
4475 free(q->queue);
4476 DIFF_QUEUE_CLEAR(q);
4477 if (options->close_file)
4478 fclose(options->file);
4479
4480 /*
4481 * Report the content-level differences with HAS_CHANGES;
4482 * diff_addremove/diff_change does not set the bit when
4483 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4484 */
4485 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4486 if (options->found_changes)
4487 DIFF_OPT_SET(options, HAS_CHANGES);
4488 else
4489 DIFF_OPT_CLR(options, HAS_CHANGES);
4490 }
4491 }
4492
4493 static void diffcore_apply_filter(const char *filter)
4494 {
4495 int i;
4496 struct diff_queue_struct *q = &diff_queued_diff;
4497 struct diff_queue_struct outq;
4498 DIFF_QUEUE_CLEAR(&outq);
4499
4500 if (!filter)
4501 return;
4502
4503 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4504 int found;
4505 for (i = found = 0; !found && i < q->nr; i++) {
4506 struct diff_filepair *p = q->queue[i];
4507 if (((p->status == DIFF_STATUS_MODIFIED) &&
4508 ((p->score &&
4509 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4510 (!p->score &&
4511 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4512 ((p->status != DIFF_STATUS_MODIFIED) &&
4513 strchr(filter, p->status)))
4514 found++;
4515 }
4516 if (found)
4517 return;
4518
4519 /* otherwise we will clear the whole queue
4520 * by copying the empty outq at the end of this
4521 * function, but first clear the current entries
4522 * in the queue.
4523 */
4524 for (i = 0; i < q->nr; i++)
4525 diff_free_filepair(q->queue[i]);
4526 }
4527 else {
4528 /* Only the matching ones */
4529 for (i = 0; i < q->nr; i++) {
4530 struct diff_filepair *p = q->queue[i];
4531
4532 if (((p->status == DIFF_STATUS_MODIFIED) &&
4533 ((p->score &&
4534 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4535 (!p->score &&
4536 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4537 ((p->status != DIFF_STATUS_MODIFIED) &&
4538 strchr(filter, p->status)))
4539 diff_q(&outq, p);
4540 else
4541 diff_free_filepair(p);
4542 }
4543 }
4544 free(q->queue);
4545 *q = outq;
4546 }
4547
4548 /* Check whether two filespecs with the same mode and size are identical */
4549 static int diff_filespec_is_identical(struct diff_filespec *one,
4550 struct diff_filespec *two)
4551 {
4552 if (S_ISGITLINK(one->mode))
4553 return 0;
4554 if (diff_populate_filespec(one, 0))
4555 return 0;
4556 if (diff_populate_filespec(two, 0))
4557 return 0;
4558 return !memcmp(one->data, two->data, one->size);
4559 }
4560
4561 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4562 {
4563 int i;
4564 struct diff_queue_struct *q = &diff_queued_diff;
4565 struct diff_queue_struct outq;
4566 DIFF_QUEUE_CLEAR(&outq);
4567
4568 for (i = 0; i < q->nr; i++) {
4569 struct diff_filepair *p = q->queue[i];
4570
4571 /*
4572 * 1. Entries that come from stat info dirtiness
4573 * always have both sides (iow, not create/delete),
4574 * one side of the object name is unknown, with
4575 * the same mode and size. Keep the ones that
4576 * do not match these criteria. They have real
4577 * differences.
4578 *
4579 * 2. At this point, the file is known to be modified,
4580 * with the same mode and size, and the object
4581 * name of one side is unknown. Need to inspect
4582 * the identical contents.
4583 */
4584 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4585 !DIFF_FILE_VALID(p->two) ||
4586 (p->one->sha1_valid && p->two->sha1_valid) ||
4587 (p->one->mode != p->two->mode) ||
4588 diff_populate_filespec(p->one, 1) ||
4589 diff_populate_filespec(p->two, 1) ||
4590 (p->one->size != p->two->size) ||
4591 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4592 diff_q(&outq, p);
4593 else {
4594 /*
4595 * The caller can subtract 1 from skip_stat_unmatch
4596 * to determine how many paths were dirty only
4597 * due to stat info mismatch.
4598 */
4599 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4600 diffopt->skip_stat_unmatch++;
4601 diff_free_filepair(p);
4602 }
4603 }
4604 free(q->queue);
4605 *q = outq;
4606 }
4607
4608 static int diffnamecmp(const void *a_, const void *b_)
4609 {
4610 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4611 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4612 const char *name_a, *name_b;
4613
4614 name_a = a->one ? a->one->path : a->two->path;
4615 name_b = b->one ? b->one->path : b->two->path;
4616 return strcmp(name_a, name_b);
4617 }
4618
4619 void diffcore_fix_diff_index(struct diff_options *options)
4620 {
4621 struct diff_queue_struct *q = &diff_queued_diff;
4622 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4623 }
4624
4625 void diffcore_std(struct diff_options *options)
4626 {
4627 if (options->skip_stat_unmatch)
4628 diffcore_skip_stat_unmatch(options);
4629 if (!options->found_follow) {
4630 /* See try_to_follow_renames() in tree-diff.c */
4631 if (options->break_opt != -1)
4632 diffcore_break(options->break_opt);
4633 if (options->detect_rename)
4634 diffcore_rename(options);
4635 if (options->break_opt != -1)
4636 diffcore_merge_broken();
4637 }
4638 if (options->pickaxe)
4639 diffcore_pickaxe(options);
4640 if (options->orderfile)
4641 diffcore_order(options->orderfile);
4642 if (!options->found_follow)
4643 /* See try_to_follow_renames() in tree-diff.c */
4644 diff_resolve_rename_copy();
4645 diffcore_apply_filter(options->filter);
4646
4647 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4648 DIFF_OPT_SET(options, HAS_CHANGES);
4649 else
4650 DIFF_OPT_CLR(options, HAS_CHANGES);
4651
4652 options->found_follow = 0;
4653 }
4654
4655 int diff_result_code(struct diff_options *opt, int status)
4656 {
4657 int result = 0;
4658
4659 diff_warn_rename_limit("diff.renamelimit",
4660 opt->needed_rename_limit,
4661 opt->degraded_cc_to_c);
4662 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4663 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4664 return status;
4665 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4666 DIFF_OPT_TST(opt, HAS_CHANGES))
4667 result |= 01;
4668 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4669 DIFF_OPT_TST(opt, CHECK_FAILED))
4670 result |= 02;
4671 return result;
4672 }
4673
4674 int diff_can_quit_early(struct diff_options *opt)
4675 {
4676 return (DIFF_OPT_TST(opt, QUICK) &&
4677 !opt->filter &&
4678 DIFF_OPT_TST(opt, HAS_CHANGES));
4679 }
4680
4681 /*
4682 * Shall changes to this submodule be ignored?
4683 *
4684 * Submodule changes can be configured to be ignored separately for each path,
4685 * but that configuration can be overridden from the command line.
4686 */
4687 static int is_submodule_ignored(const char *path, struct diff_options *options)
4688 {
4689 int ignored = 0;
4690 unsigned orig_flags = options->flags;
4691 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4692 set_diffopt_flags_from_submodule_config(options, path);
4693 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4694 ignored = 1;
4695 options->flags = orig_flags;
4696 return ignored;
4697 }
4698
4699 void diff_addremove(struct diff_options *options,
4700 int addremove, unsigned mode,
4701 const unsigned char *sha1,
4702 int sha1_valid,
4703 const char *concatpath, unsigned dirty_submodule)
4704 {
4705 struct diff_filespec *one, *two;
4706
4707 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4708 return;
4709
4710 /* This may look odd, but it is a preparation for
4711 * feeding "there are unchanged files which should
4712 * not produce diffs, but when you are doing copy
4713 * detection you would need them, so here they are"
4714 * entries to the diff-core. They will be prefixed
4715 * with something like '=' or '*' (I haven't decided
4716 * which but should not make any difference).
4717 * Feeding the same new and old to diff_change()
4718 * also has the same effect.
4719 * Before the final output happens, they are pruned after
4720 * merged into rename/copy pairs as appropriate.
4721 */
4722 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4723 addremove = (addremove == '+' ? '-' :
4724 addremove == '-' ? '+' : addremove);
4725
4726 if (options->prefix &&
4727 strncmp(concatpath, options->prefix, options->prefix_length))
4728 return;
4729
4730 one = alloc_filespec(concatpath);
4731 two = alloc_filespec(concatpath);
4732
4733 if (addremove != '+')
4734 fill_filespec(one, sha1, sha1_valid, mode);
4735 if (addremove != '-') {
4736 fill_filespec(two, sha1, sha1_valid, mode);
4737 two->dirty_submodule = dirty_submodule;
4738 }
4739
4740 diff_queue(&diff_queued_diff, one, two);
4741 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4742 DIFF_OPT_SET(options, HAS_CHANGES);
4743 }
4744
4745 void diff_change(struct diff_options *options,
4746 unsigned old_mode, unsigned new_mode,
4747 const unsigned char *old_sha1,
4748 const unsigned char *new_sha1,
4749 int old_sha1_valid, int new_sha1_valid,
4750 const char *concatpath,
4751 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4752 {
4753 struct diff_filespec *one, *two;
4754
4755 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4756 is_submodule_ignored(concatpath, options))
4757 return;
4758
4759 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4760 unsigned tmp;
4761 const unsigned char *tmp_c;
4762 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4763 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4764 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4765 new_sha1_valid = tmp;
4766 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4767 new_dirty_submodule = tmp;
4768 }
4769
4770 if (options->prefix &&
4771 strncmp(concatpath, options->prefix, options->prefix_length))
4772 return;
4773
4774 one = alloc_filespec(concatpath);
4775 two = alloc_filespec(concatpath);
4776 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4777 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4778 one->dirty_submodule = old_dirty_submodule;
4779 two->dirty_submodule = new_dirty_submodule;
4780
4781 diff_queue(&diff_queued_diff, one, two);
4782 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4783 DIFF_OPT_SET(options, HAS_CHANGES);
4784 }
4785
4786 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4787 {
4788 struct diff_filepair *pair;
4789 struct diff_filespec *one, *two;
4790
4791 if (options->prefix &&
4792 strncmp(path, options->prefix, options->prefix_length))
4793 return NULL;
4794
4795 one = alloc_filespec(path);
4796 two = alloc_filespec(path);
4797 pair = diff_queue(&diff_queued_diff, one, two);
4798 pair->is_unmerged = 1;
4799 return pair;
4800 }
4801
4802 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4803 size_t *outsize)
4804 {
4805 struct diff_tempfile *temp;
4806 const char *argv[3];
4807 const char **arg = argv;
4808 struct child_process child;
4809 struct strbuf buf = STRBUF_INIT;
4810 int err = 0;
4811
4812 temp = prepare_temp_file(spec->path, spec);
4813 *arg++ = pgm;
4814 *arg++ = temp->name;
4815 *arg = NULL;
4816
4817 memset(&child, 0, sizeof(child));
4818 child.use_shell = 1;
4819 child.argv = argv;
4820 child.out = -1;
4821 if (start_command(&child)) {
4822 remove_tempfile();
4823 return NULL;
4824 }
4825
4826 if (strbuf_read(&buf, child.out, 0) < 0)
4827 err = error("error reading from textconv command '%s'", pgm);
4828 close(child.out);
4829
4830 if (finish_command(&child) || err) {
4831 strbuf_release(&buf);
4832 remove_tempfile();
4833 return NULL;
4834 }
4835 remove_tempfile();
4836
4837 return strbuf_detach(&buf, outsize);
4838 }
4839
4840 size_t fill_textconv(struct userdiff_driver *driver,
4841 struct diff_filespec *df,
4842 char **outbuf)
4843 {
4844 size_t size;
4845
4846 if (!driver || !driver->textconv) {
4847 if (!DIFF_FILE_VALID(df)) {
4848 *outbuf = "";
4849 return 0;
4850 }
4851 if (diff_populate_filespec(df, 0))
4852 die("unable to read files to diff");
4853 *outbuf = df->data;
4854 return df->size;
4855 }
4856
4857 if (driver->textconv_cache && df->sha1_valid) {
4858 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4859 &size);
4860 if (*outbuf)
4861 return size;
4862 }
4863
4864 *outbuf = run_textconv(driver->textconv, df, &size);
4865 if (!*outbuf)
4866 die("unable to read files to diff");
4867
4868 if (driver->textconv_cache && df->sha1_valid) {
4869 /* ignore errors, as we might be in a readonly repository */
4870 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4871 size);
4872 /*
4873 * we could save up changes and flush them all at the end,
4874 * but we would need an extra call after all diffing is done.
4875 * Since generating a cache entry is the slow path anyway,
4876 * this extra overhead probably isn't a big deal.
4877 */
4878 notes_cache_write(driver->textconv_cache);
4879 }
4880
4881 return size;
4882 }
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