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Documentation/howto: convert plain text files to asciidoc
[git/mjg.git] / diff.c
blob35d3f073859acf66dbd38c6096c0cc47bd26b6e2
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 uintmax_t added, deleted;
1304 } **files;
1305 };
1306
1307 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1308 const char *name_a,
1309 const char *name_b)
1310 {
1311 struct diffstat_file *x;
1312 x = xcalloc(sizeof (*x), 1);
1313 if (diffstat->nr == diffstat->alloc) {
1314 diffstat->alloc = alloc_nr(diffstat->alloc);
1315 diffstat->files = xrealloc(diffstat->files,
1316 diffstat->alloc * sizeof(x));
1317 }
1318 diffstat->files[diffstat->nr++] = x;
1319 if (name_b) {
1320 x->from_name = xstrdup(name_a);
1321 x->name = xstrdup(name_b);
1322 x->is_renamed = 1;
1323 }
1324 else {
1325 x->from_name = NULL;
1326 x->name = xstrdup(name_a);
1327 }
1328 return x;
1329 }
1330
1331 static void diffstat_consume(void *priv, char *line, unsigned long len)
1332 {
1333 struct diffstat_t *diffstat = priv;
1334 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1335
1336 if (line[0] == '+')
1337 x->added++;
1338 else if (line[0] == '-')
1339 x->deleted++;
1340 }
1341
1342 const char mime_boundary_leader[] = "------------";
1343
1344 static int scale_linear(int it, int width, int max_change)
1345 {
1346 if (!it)
1347 return 0;
1348 /*
1349 * make sure that at least one '-' or '+' is printed if
1350 * there is any change to this path. The easiest way is to
1351 * scale linearly as if the alloted width is one column shorter
1352 * than it is, and then add 1 to the result.
1353 */
1354 return 1 + (it * (width - 1) / max_change);
1355 }
1356
1357 static void show_name(FILE *file,
1358 const char *prefix, const char *name, int len)
1359 {
1360 fprintf(file, " %s%-*s |", prefix, len, name);
1361 }
1362
1363 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1364 {
1365 if (cnt <= 0)
1366 return;
1367 fprintf(file, "%s", set);
1368 while (cnt--)
1369 putc(ch, file);
1370 fprintf(file, "%s", reset);
1371 }
1372
1373 static void fill_print_name(struct diffstat_file *file)
1374 {
1375 char *pname;
1376
1377 if (file->print_name)
1378 return;
1379
1380 if (!file->is_renamed) {
1381 struct strbuf buf = STRBUF_INIT;
1382 if (quote_c_style(file->name, &buf, NULL, 0)) {
1383 pname = strbuf_detach(&buf, NULL);
1384 } else {
1385 pname = file->name;
1386 strbuf_release(&buf);
1387 }
1388 } else {
1389 pname = pprint_rename(file->from_name, file->name);
1390 }
1391 file->print_name = pname;
1392 }
1393
1394 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1395 {
1396 struct strbuf sb = STRBUF_INIT;
1397 int ret;
1398
1399 if (!files) {
1400 assert(insertions == 0 && deletions == 0);
1401 return fprintf(fp, "%s\n", " 0 files changed");
1402 }
1403
1404 strbuf_addf(&sb,
1405 (files == 1) ? " %d file changed" : " %d files changed",
1406 files);
1407
1408 /*
1409 * For binary diff, the caller may want to print "x files
1410 * changed" with insertions == 0 && deletions == 0.
1411 *
1412 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1413 * is probably less confusing (i.e skip over "2 files changed
1414 * but nothing about added/removed lines? Is this a bug in Git?").
1415 */
1416 if (insertions || deletions == 0) {
1417 /*
1418 * TRANSLATORS: "+" in (+) is a line addition marker;
1419 * do not translate it.
1420 */
1421 strbuf_addf(&sb,
1422 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1423 insertions);
1424 }
1425
1426 if (deletions || insertions == 0) {
1427 /*
1428 * TRANSLATORS: "-" in (-) is a line removal marker;
1429 * do not translate it.
1430 */
1431 strbuf_addf(&sb,
1432 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1433 deletions);
1434 }
1435 strbuf_addch(&sb, '\n');
1436 ret = fputs(sb.buf, fp);
1437 strbuf_release(&sb);
1438 return ret;
1439 }
1440
1441 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1442 {
1443 int i, len, add, del, adds = 0, dels = 0;
1444 uintmax_t max_change = 0, max_len = 0;
1445 int total_files = data->nr, count;
1446 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1447 const char *reset, *add_c, *del_c;
1448 const char *line_prefix = "";
1449 int extra_shown = 0;
1450 struct strbuf *msg = NULL;
1451
1452 if (data->nr == 0)
1453 return;
1454
1455 if (options->output_prefix) {
1456 msg = options->output_prefix(options, options->output_prefix_data);
1457 line_prefix = msg->buf;
1458 }
1459
1460 count = options->stat_count ? options->stat_count : data->nr;
1461
1462 reset = diff_get_color_opt(options, DIFF_RESET);
1463 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1464 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1465
1466 /*
1467 * Find the longest filename and max number of changes
1468 */
1469 for (i = 0; (i < count) && (i < data->nr); i++) {
1470 struct diffstat_file *file = data->files[i];
1471 uintmax_t change = file->added + file->deleted;
1472 if (!data->files[i]->is_renamed &&
1473 (change == 0)) {
1474 count++; /* not shown == room for one more */
1475 continue;
1476 }
1477 fill_print_name(file);
1478 len = strlen(file->print_name);
1479 if (max_len < len)
1480 max_len = len;
1481
1482 if (file->is_unmerged) {
1483 /* "Unmerged" is 8 characters */
1484 bin_width = bin_width < 8 ? 8 : bin_width;
1485 continue;
1486 }
1487 if (file->is_binary) {
1488 /* "Bin XXX -> YYY bytes" */
1489 int w = 14 + decimal_width(file->added)
1490 + decimal_width(file->deleted);
1491 bin_width = bin_width < w ? w : bin_width;
1492 /* Display change counts aligned with "Bin" */
1493 number_width = 3;
1494 continue;
1495 }
1496
1497 if (max_change < change)
1498 max_change = change;
1499 }
1500 count = i; /* min(count, data->nr) */
1501
1502 /*
1503 * We have width = stat_width or term_columns() columns total.
1504 * We want a maximum of min(max_len, stat_name_width) for the name part.
1505 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1506 * We also need 1 for " " and 4 + decimal_width(max_change)
1507 * for " | NNNN " and one the empty column at the end, altogether
1508 * 6 + decimal_width(max_change).
1509 *
1510 * If there's not enough space, we will use the smaller of
1511 * stat_name_width (if set) and 5/8*width for the filename,
1512 * and the rest for constant elements + graph part, but no more
1513 * than stat_graph_width for the graph part.
1514 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1515 * for the standard terminal size).
1516 *
1517 * In other words: stat_width limits the maximum width, and
1518 * stat_name_width fixes the maximum width of the filename,
1519 * and is also used to divide available columns if there
1520 * aren't enough.
1521 *
1522 * Binary files are displayed with "Bin XXX -> YYY bytes"
1523 * instead of the change count and graph. This part is treated
1524 * similarly to the graph part, except that it is not
1525 * "scaled". If total width is too small to accomodate the
1526 * guaranteed minimum width of the filename part and the
1527 * separators and this message, this message will "overflow"
1528 * making the line longer than the maximum width.
1529 */
1530
1531 if (options->stat_width == -1)
1532 width = term_columns() - options->output_prefix_length;
1533 else
1534 width = options->stat_width ? options->stat_width : 80;
1535 number_width = decimal_width(max_change) > number_width ?
1536 decimal_width(max_change) : number_width;
1537
1538 if (options->stat_graph_width == -1)
1539 options->stat_graph_width = diff_stat_graph_width;
1540
1541 /*
1542 * Guarantee 3/8*16==6 for the graph part
1543 * and 5/8*16==10 for the filename part
1544 */
1545 if (width < 16 + 6 + number_width)
1546 width = 16 + 6 + number_width;
1547
1548 /*
1549 * First assign sizes that are wanted, ignoring available width.
1550 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1551 * starting from "XXX" should fit in graph_width.
1552 */
1553 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1554 if (options->stat_graph_width &&
1555 options->stat_graph_width < graph_width)
1556 graph_width = options->stat_graph_width;
1557
1558 name_width = (options->stat_name_width > 0 &&
1559 options->stat_name_width < max_len) ?
1560 options->stat_name_width : max_len;
1561
1562 /*
1563 * Adjust adjustable widths not to exceed maximum width
1564 */
1565 if (name_width + number_width + 6 + graph_width > width) {
1566 if (graph_width > width * 3/8 - number_width - 6) {
1567 graph_width = width * 3/8 - number_width - 6;
1568 if (graph_width < 6)
1569 graph_width = 6;
1570 }
1571
1572 if (options->stat_graph_width &&
1573 graph_width > options->stat_graph_width)
1574 graph_width = options->stat_graph_width;
1575 if (name_width > width - number_width - 6 - graph_width)
1576 name_width = width - number_width - 6 - graph_width;
1577 else
1578 graph_width = width - number_width - 6 - name_width;
1579 }
1580
1581 /*
1582 * From here name_width is the width of the name area,
1583 * and graph_width is the width of the graph area.
1584 * max_change is used to scale graph properly.
1585 */
1586 for (i = 0; i < count; i++) {
1587 const char *prefix = "";
1588 char *name = data->files[i]->print_name;
1589 uintmax_t added = data->files[i]->added;
1590 uintmax_t deleted = data->files[i]->deleted;
1591 int name_len;
1592
1593 if (!data->files[i]->is_renamed &&
1594 (added + deleted == 0)) {
1595 total_files--;
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 (data->files[i]->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 (data->files[i]->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 adds += add;
1643 dels += del;
1644
1645 if (graph_width <= max_change) {
1646 int total = add + del;
1647
1648 total = scale_linear(add + del, graph_width, max_change);
1649 if (total < 2 && add && del)
1650 /* width >= 2 due to the sanity check */
1651 total = 2;
1652 if (add < del) {
1653 add = scale_linear(add, graph_width, max_change);
1654 del = total - add;
1655 } else {
1656 del = scale_linear(del, graph_width, max_change);
1657 add = total - del;
1658 }
1659 }
1660 fprintf(options->file, "%s", line_prefix);
1661 show_name(options->file, prefix, name, len);
1662 fprintf(options->file, " %*"PRIuMAX"%s",
1663 number_width, added + deleted,
1664 added + deleted ? " " : "");
1665 show_graph(options->file, '+', add, add_c, reset);
1666 show_graph(options->file, '-', del, del_c, reset);
1667 fprintf(options->file, "\n");
1668 }
1669 for (i = count; i < data->nr; i++) {
1670 uintmax_t added = data->files[i]->added;
1671 uintmax_t deleted = data->files[i]->deleted;
1672 if (!data->files[i]->is_renamed &&
1673 (added + deleted == 0)) {
1674 total_files--;
1675 continue;
1676 }
1677 adds += added;
1678 dels += deleted;
1679 if (!extra_shown)
1680 fprintf(options->file, "%s ...\n", line_prefix);
1681 extra_shown = 1;
1682 }
1683 fprintf(options->file, "%s", line_prefix);
1684 print_stat_summary(options->file, total_files, adds, dels);
1685 }
1686
1687 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1688 {
1689 int i, adds = 0, dels = 0, total_files = data->nr;
1690
1691 if (data->nr == 0)
1692 return;
1693
1694 for (i = 0; i < data->nr; i++) {
1695 int added = data->files[i]->added;
1696 int deleted= data->files[i]->deleted;
1697
1698 if (data->files[i]->is_unmerged)
1699 continue;
1700 if (!data->files[i]->is_renamed && (added + deleted == 0)) {
1701 total_files--;
1702 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1703 adds += added;
1704 dels += deleted;
1705 }
1706 }
1707 if (options->output_prefix) {
1708 struct strbuf *msg = NULL;
1709 msg = options->output_prefix(options,
1710 options->output_prefix_data);
1711 fprintf(options->file, "%s", msg->buf);
1712 }
1713 print_stat_summary(options->file, total_files, adds, dels);
1714 }
1715
1716 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1717 {
1718 int i;
1719
1720 if (data->nr == 0)
1721 return;
1722
1723 for (i = 0; i < data->nr; i++) {
1724 struct diffstat_file *file = data->files[i];
1725
1726 if (options->output_prefix) {
1727 struct strbuf *msg = NULL;
1728 msg = options->output_prefix(options,
1729 options->output_prefix_data);
1730 fprintf(options->file, "%s", msg->buf);
1731 }
1732
1733 if (file->is_binary)
1734 fprintf(options->file, "-\t-\t");
1735 else
1736 fprintf(options->file,
1737 "%"PRIuMAX"\t%"PRIuMAX"\t",
1738 file->added, file->deleted);
1739 if (options->line_termination) {
1740 fill_print_name(file);
1741 if (!file->is_renamed)
1742 write_name_quoted(file->name, options->file,
1743 options->line_termination);
1744 else {
1745 fputs(file->print_name, options->file);
1746 putc(options->line_termination, options->file);
1747 }
1748 } else {
1749 if (file->is_renamed) {
1750 putc('\0', options->file);
1751 write_name_quoted(file->from_name, options->file, '\0');
1752 }
1753 write_name_quoted(file->name, options->file, '\0');
1754 }
1755 }
1756 }
1757
1758 struct dirstat_file {
1759 const char *name;
1760 unsigned long changed;
1761 };
1762
1763 struct dirstat_dir {
1764 struct dirstat_file *files;
1765 int alloc, nr, permille, cumulative;
1766 };
1767
1768 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1769 unsigned long changed, const char *base, int baselen)
1770 {
1771 unsigned long this_dir = 0;
1772 unsigned int sources = 0;
1773 const char *line_prefix = "";
1774 struct strbuf *msg = NULL;
1775
1776 if (opt->output_prefix) {
1777 msg = opt->output_prefix(opt, opt->output_prefix_data);
1778 line_prefix = msg->buf;
1779 }
1780
1781 while (dir->nr) {
1782 struct dirstat_file *f = dir->files;
1783 int namelen = strlen(f->name);
1784 unsigned long this;
1785 char *slash;
1786
1787 if (namelen < baselen)
1788 break;
1789 if (memcmp(f->name, base, baselen))
1790 break;
1791 slash = strchr(f->name + baselen, '/');
1792 if (slash) {
1793 int newbaselen = slash + 1 - f->name;
1794 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1795 sources++;
1796 } else {
1797 this = f->changed;
1798 dir->files++;
1799 dir->nr--;
1800 sources += 2;
1801 }
1802 this_dir += this;
1803 }
1804
1805 /*
1806 * We don't report dirstat's for
1807 * - the top level
1808 * - or cases where everything came from a single directory
1809 * under this directory (sources == 1).
1810 */
1811 if (baselen && sources != 1) {
1812 if (this_dir) {
1813 int permille = this_dir * 1000 / changed;
1814 if (permille >= dir->permille) {
1815 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1816 permille / 10, permille % 10, baselen, base);
1817 if (!dir->cumulative)
1818 return 0;
1819 }
1820 }
1821 }
1822 return this_dir;
1823 }
1824
1825 static int dirstat_compare(const void *_a, const void *_b)
1826 {
1827 const struct dirstat_file *a = _a;
1828 const struct dirstat_file *b = _b;
1829 return strcmp(a->name, b->name);
1830 }
1831
1832 static void show_dirstat(struct diff_options *options)
1833 {
1834 int i;
1835 unsigned long changed;
1836 struct dirstat_dir dir;
1837 struct diff_queue_struct *q = &diff_queued_diff;
1838
1839 dir.files = NULL;
1840 dir.alloc = 0;
1841 dir.nr = 0;
1842 dir.permille = options->dirstat_permille;
1843 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1844
1845 changed = 0;
1846 for (i = 0; i < q->nr; i++) {
1847 struct diff_filepair *p = q->queue[i];
1848 const char *name;
1849 unsigned long copied, added, damage;
1850 int content_changed;
1851
1852 name = p->two->path ? p->two->path : p->one->path;
1853
1854 if (p->one->sha1_valid && p->two->sha1_valid)
1855 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1856 else
1857 content_changed = 1;
1858
1859 if (!content_changed) {
1860 /*
1861 * The SHA1 has not changed, so pre-/post-content is
1862 * identical. We can therefore skip looking at the
1863 * file contents altogether.
1864 */
1865 damage = 0;
1866 goto found_damage;
1867 }
1868
1869 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1870 /*
1871 * In --dirstat-by-file mode, we don't really need to
1872 * look at the actual file contents at all.
1873 * The fact that the SHA1 changed is enough for us to
1874 * add this file to the list of results
1875 * (with each file contributing equal damage).
1876 */
1877 damage = 1;
1878 goto found_damage;
1879 }
1880
1881 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1882 diff_populate_filespec(p->one, 0);
1883 diff_populate_filespec(p->two, 0);
1884 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1885 &copied, &added);
1886 diff_free_filespec_data(p->one);
1887 diff_free_filespec_data(p->two);
1888 } else if (DIFF_FILE_VALID(p->one)) {
1889 diff_populate_filespec(p->one, 1);
1890 copied = added = 0;
1891 diff_free_filespec_data(p->one);
1892 } else if (DIFF_FILE_VALID(p->two)) {
1893 diff_populate_filespec(p->two, 1);
1894 copied = 0;
1895 added = p->two->size;
1896 diff_free_filespec_data(p->two);
1897 } else
1898 continue;
1899
1900 /*
1901 * Original minus copied is the removed material,
1902 * added is the new material. They are both damages
1903 * made to the preimage.
1904 * If the resulting damage is zero, we know that
1905 * diffcore_count_changes() considers the two entries to
1906 * be identical, but since content_changed is true, we
1907 * know that there must have been _some_ kind of change,
1908 * so we force all entries to have damage > 0.
1909 */
1910 damage = (p->one->size - copied) + added;
1911 if (!damage)
1912 damage = 1;
1913
1914 found_damage:
1915 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1916 dir.files[dir.nr].name = name;
1917 dir.files[dir.nr].changed = damage;
1918 changed += damage;
1919 dir.nr++;
1920 }
1921
1922 /* This can happen even with many files, if everything was renames */
1923 if (!changed)
1924 return;
1925
1926 /* Show all directories with more than x% of the changes */
1927 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1928 gather_dirstat(options, &dir, changed, "", 0);
1929 }
1930
1931 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1932 {
1933 int i;
1934 unsigned long changed;
1935 struct dirstat_dir dir;
1936
1937 if (data->nr == 0)
1938 return;
1939
1940 dir.files = NULL;
1941 dir.alloc = 0;
1942 dir.nr = 0;
1943 dir.permille = options->dirstat_permille;
1944 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1945
1946 changed = 0;
1947 for (i = 0; i < data->nr; i++) {
1948 struct diffstat_file *file = data->files[i];
1949 unsigned long damage = file->added + file->deleted;
1950 if (file->is_binary)
1951 /*
1952 * binary files counts bytes, not lines. Must find some
1953 * way to normalize binary bytes vs. textual lines.
1954 * The following heuristic assumes that there are 64
1955 * bytes per "line".
1956 * This is stupid and ugly, but very cheap...
1957 */
1958 damage = (damage + 63) / 64;
1959 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1960 dir.files[dir.nr].name = file->name;
1961 dir.files[dir.nr].changed = damage;
1962 changed += damage;
1963 dir.nr++;
1964 }
1965
1966 /* This can happen even with many files, if everything was renames */
1967 if (!changed)
1968 return;
1969
1970 /* Show all directories with more than x% of the changes */
1971 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1972 gather_dirstat(options, &dir, changed, "", 0);
1973 }
1974
1975 static void free_diffstat_info(struct diffstat_t *diffstat)
1976 {
1977 int i;
1978 for (i = 0; i < diffstat->nr; i++) {
1979 struct diffstat_file *f = diffstat->files[i];
1980 if (f->name != f->print_name)
1981 free(f->print_name);
1982 free(f->name);
1983 free(f->from_name);
1984 free(f);
1985 }
1986 free(diffstat->files);
1987 }
1988
1989 struct checkdiff_t {
1990 const char *filename;
1991 int lineno;
1992 int conflict_marker_size;
1993 struct diff_options *o;
1994 unsigned ws_rule;
1995 unsigned status;
1996 };
1997
1998 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1999 {
2000 char firstchar;
2001 int cnt;
2002
2003 if (len < marker_size + 1)
2004 return 0;
2005 firstchar = line[0];
2006 switch (firstchar) {
2007 case '=': case '>': case '<': case '|':
2008 break;
2009 default:
2010 return 0;
2011 }
2012 for (cnt = 1; cnt < marker_size; cnt++)
2013 if (line[cnt] != firstchar)
2014 return 0;
2015 /* line[1] thru line[marker_size-1] are same as firstchar */
2016 if (len < marker_size + 1 || !isspace(line[marker_size]))
2017 return 0;
2018 return 1;
2019 }
2020
2021 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2022 {
2023 struct checkdiff_t *data = priv;
2024 int marker_size = data->conflict_marker_size;
2025 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2026 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2027 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2028 char *err;
2029 char *line_prefix = "";
2030 struct strbuf *msgbuf;
2031
2032 assert(data->o);
2033 if (data->o->output_prefix) {
2034 msgbuf = data->o->output_prefix(data->o,
2035 data->o->output_prefix_data);
2036 line_prefix = msgbuf->buf;
2037 }
2038
2039 if (line[0] == '+') {
2040 unsigned bad;
2041 data->lineno++;
2042 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2043 data->status |= 1;
2044 fprintf(data->o->file,
2045 "%s%s:%d: leftover conflict marker\n",
2046 line_prefix, data->filename, data->lineno);
2047 }
2048 bad = ws_check(line + 1, len - 1, data->ws_rule);
2049 if (!bad)
2050 return;
2051 data->status |= bad;
2052 err = whitespace_error_string(bad);
2053 fprintf(data->o->file, "%s%s:%d: %s.\n",
2054 line_prefix, data->filename, data->lineno, err);
2055 free(err);
2056 emit_line(data->o, set, reset, line, 1);
2057 ws_check_emit(line + 1, len - 1, data->ws_rule,
2058 data->o->file, set, reset, ws);
2059 } else if (line[0] == ' ') {
2060 data->lineno++;
2061 } else if (line[0] == '@') {
2062 char *plus = strchr(line, '+');
2063 if (plus)
2064 data->lineno = strtol(plus, NULL, 10) - 1;
2065 else
2066 die("invalid diff");
2067 }
2068 }
2069
2070 static unsigned char *deflate_it(char *data,
2071 unsigned long size,
2072 unsigned long *result_size)
2073 {
2074 int bound;
2075 unsigned char *deflated;
2076 git_zstream stream;
2077
2078 memset(&stream, 0, sizeof(stream));
2079 git_deflate_init(&stream, zlib_compression_level);
2080 bound = git_deflate_bound(&stream, size);
2081 deflated = xmalloc(bound);
2082 stream.next_out = deflated;
2083 stream.avail_out = bound;
2084
2085 stream.next_in = (unsigned char *)data;
2086 stream.avail_in = size;
2087 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2088 ; /* nothing */
2089 git_deflate_end(&stream);
2090 *result_size = stream.total_out;
2091 return deflated;
2092 }
2093
2094 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2095 {
2096 void *cp;
2097 void *delta;
2098 void *deflated;
2099 void *data;
2100 unsigned long orig_size;
2101 unsigned long delta_size;
2102 unsigned long deflate_size;
2103 unsigned long data_size;
2104
2105 /* We could do deflated delta, or we could do just deflated two,
2106 * whichever is smaller.
2107 */
2108 delta = NULL;
2109 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2110 if (one->size && two->size) {
2111 delta = diff_delta(one->ptr, one->size,
2112 two->ptr, two->size,
2113 &delta_size, deflate_size);
2114 if (delta) {
2115 void *to_free = delta;
2116 orig_size = delta_size;
2117 delta = deflate_it(delta, delta_size, &delta_size);
2118 free(to_free);
2119 }
2120 }
2121
2122 if (delta && delta_size < deflate_size) {
2123 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2124 free(deflated);
2125 data = delta;
2126 data_size = delta_size;
2127 }
2128 else {
2129 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2130 free(delta);
2131 data = deflated;
2132 data_size = deflate_size;
2133 }
2134
2135 /* emit data encoded in base85 */
2136 cp = data;
2137 while (data_size) {
2138 int bytes = (52 < data_size) ? 52 : data_size;
2139 char line[70];
2140 data_size -= bytes;
2141 if (bytes <= 26)
2142 line[0] = bytes + 'A' - 1;
2143 else
2144 line[0] = bytes - 26 + 'a' - 1;
2145 encode_85(line + 1, cp, bytes);
2146 cp = (char *) cp + bytes;
2147 fprintf(file, "%s", prefix);
2148 fputs(line, file);
2149 fputc('\n', file);
2150 }
2151 fprintf(file, "%s\n", prefix);
2152 free(data);
2153 }
2154
2155 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2156 {
2157 fprintf(file, "%sGIT binary patch\n", prefix);
2158 emit_binary_diff_body(file, one, two, prefix);
2159 emit_binary_diff_body(file, two, one, prefix);
2160 }
2161
2162 int diff_filespec_is_binary(struct diff_filespec *one)
2163 {
2164 if (one->is_binary == -1) {
2165 diff_filespec_load_driver(one);
2166 if (one->driver->binary != -1)
2167 one->is_binary = one->driver->binary;
2168 else {
2169 if (!one->data && DIFF_FILE_VALID(one))
2170 diff_populate_filespec(one, 0);
2171 if (one->data)
2172 one->is_binary = buffer_is_binary(one->data,
2173 one->size);
2174 if (one->is_binary == -1)
2175 one->is_binary = 0;
2176 }
2177 }
2178 return one->is_binary;
2179 }
2180
2181 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2182 {
2183 diff_filespec_load_driver(one);
2184 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2185 }
2186
2187 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2188 {
2189 if (!options->a_prefix)
2190 options->a_prefix = a;
2191 if (!options->b_prefix)
2192 options->b_prefix = b;
2193 }
2194
2195 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2196 {
2197 if (!DIFF_FILE_VALID(one))
2198 return NULL;
2199
2200 diff_filespec_load_driver(one);
2201 return userdiff_get_textconv(one->driver);
2202 }
2203
2204 static void builtin_diff(const char *name_a,
2205 const char *name_b,
2206 struct diff_filespec *one,
2207 struct diff_filespec *two,
2208 const char *xfrm_msg,
2209 int must_show_header,
2210 struct diff_options *o,
2211 int complete_rewrite)
2212 {
2213 mmfile_t mf1, mf2;
2214 const char *lbl[2];
2215 char *a_one, *b_two;
2216 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2217 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2218 const char *a_prefix, *b_prefix;
2219 struct userdiff_driver *textconv_one = NULL;
2220 struct userdiff_driver *textconv_two = NULL;
2221 struct strbuf header = STRBUF_INIT;
2222 struct strbuf *msgbuf;
2223 char *line_prefix = "";
2224
2225 if (o->output_prefix) {
2226 msgbuf = o->output_prefix(o, o->output_prefix_data);
2227 line_prefix = msgbuf->buf;
2228 }
2229
2230 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2231 (!one->mode || S_ISGITLINK(one->mode)) &&
2232 (!two->mode || S_ISGITLINK(two->mode))) {
2233 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2234 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2235 show_submodule_summary(o->file, one ? one->path : two->path,
2236 one->sha1, two->sha1, two->dirty_submodule,
2237 del, add, reset);
2238 return;
2239 }
2240
2241 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2242 textconv_one = get_textconv(one);
2243 textconv_two = get_textconv(two);
2244 }
2245
2246 diff_set_mnemonic_prefix(o, "a/", "b/");
2247 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2248 a_prefix = o->b_prefix;
2249 b_prefix = o->a_prefix;
2250 } else {
2251 a_prefix = o->a_prefix;
2252 b_prefix = o->b_prefix;
2253 }
2254
2255 /* Never use a non-valid filename anywhere if at all possible */
2256 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2257 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2258
2259 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2260 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2261 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2262 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2263 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2264 if (lbl[0][0] == '/') {
2265 /* /dev/null */
2266 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2267 if (xfrm_msg)
2268 strbuf_addstr(&header, xfrm_msg);
2269 must_show_header = 1;
2270 }
2271 else if (lbl[1][0] == '/') {
2272 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2273 if (xfrm_msg)
2274 strbuf_addstr(&header, xfrm_msg);
2275 must_show_header = 1;
2276 }
2277 else {
2278 if (one->mode != two->mode) {
2279 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2280 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2281 must_show_header = 1;
2282 }
2283 if (xfrm_msg)
2284 strbuf_addstr(&header, xfrm_msg);
2285
2286 /*
2287 * we do not run diff between different kind
2288 * of objects.
2289 */
2290 if ((one->mode ^ two->mode) & S_IFMT)
2291 goto free_ab_and_return;
2292 if (complete_rewrite &&
2293 (textconv_one || !diff_filespec_is_binary(one)) &&
2294 (textconv_two || !diff_filespec_is_binary(two))) {
2295 fprintf(o->file, "%s", header.buf);
2296 strbuf_reset(&header);
2297 emit_rewrite_diff(name_a, name_b, one, two,
2298 textconv_one, textconv_two, o);
2299 o->found_changes = 1;
2300 goto free_ab_and_return;
2301 }
2302 }
2303
2304 if (o->irreversible_delete && lbl[1][0] == '/') {
2305 fprintf(o->file, "%s", header.buf);
2306 strbuf_reset(&header);
2307 goto free_ab_and_return;
2308 } else if (!DIFF_OPT_TST(o, TEXT) &&
2309 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2310 (!textconv_two && diff_filespec_is_binary(two)) )) {
2311 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2312 die("unable to read files to diff");
2313 /* Quite common confusing case */
2314 if (mf1.size == mf2.size &&
2315 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2316 if (must_show_header)
2317 fprintf(o->file, "%s", header.buf);
2318 goto free_ab_and_return;
2319 }
2320 fprintf(o->file, "%s", header.buf);
2321 strbuf_reset(&header);
2322 if (DIFF_OPT_TST(o, BINARY))
2323 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2324 else
2325 fprintf(o->file, "%sBinary files %s and %s differ\n",
2326 line_prefix, lbl[0], lbl[1]);
2327 o->found_changes = 1;
2328 } else {
2329 /* Crazy xdl interfaces.. */
2330 const char *diffopts = getenv("GIT_DIFF_OPTS");
2331 xpparam_t xpp;
2332 xdemitconf_t xecfg;
2333 struct emit_callback ecbdata;
2334 const struct userdiff_funcname *pe;
2335
2336 if (must_show_header) {
2337 fprintf(o->file, "%s", header.buf);
2338 strbuf_reset(&header);
2339 }
2340
2341 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2342 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2343
2344 pe = diff_funcname_pattern(one);
2345 if (!pe)
2346 pe = diff_funcname_pattern(two);
2347
2348 memset(&xpp, 0, sizeof(xpp));
2349 memset(&xecfg, 0, sizeof(xecfg));
2350 memset(&ecbdata, 0, sizeof(ecbdata));
2351 ecbdata.label_path = lbl;
2352 ecbdata.color_diff = want_color(o->use_color);
2353 ecbdata.found_changesp = &o->found_changes;
2354 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2355 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2356 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2357 ecbdata.opt = o;
2358 ecbdata.header = header.len ? &header : NULL;
2359 xpp.flags = o->xdl_opts;
2360 xecfg.ctxlen = o->context;
2361 xecfg.interhunkctxlen = o->interhunkcontext;
2362 xecfg.flags = XDL_EMIT_FUNCNAMES;
2363 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2364 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2365 if (pe)
2366 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2367 if (!diffopts)
2368 ;
2369 else if (!prefixcmp(diffopts, "--unified="))
2370 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2371 else if (!prefixcmp(diffopts, "-u"))
2372 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2373 if (o->word_diff)
2374 init_diff_words_data(&ecbdata, o, one, two);
2375 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2376 &xpp, &xecfg);
2377 if (o->word_diff)
2378 free_diff_words_data(&ecbdata);
2379 if (textconv_one)
2380 free(mf1.ptr);
2381 if (textconv_two)
2382 free(mf2.ptr);
2383 xdiff_clear_find_func(&xecfg);
2384 }
2385
2386 free_ab_and_return:
2387 strbuf_release(&header);
2388 diff_free_filespec_data(one);
2389 diff_free_filespec_data(two);
2390 free(a_one);
2391 free(b_two);
2392 return;
2393 }
2394
2395 static void builtin_diffstat(const char *name_a, const char *name_b,
2396 struct diff_filespec *one,
2397 struct diff_filespec *two,
2398 struct diffstat_t *diffstat,
2399 struct diff_options *o,
2400 int complete_rewrite)
2401 {
2402 mmfile_t mf1, mf2;
2403 struct diffstat_file *data;
2404 int same_contents;
2405
2406 data = diffstat_add(diffstat, name_a, name_b);
2407
2408 if (!one || !two) {
2409 data->is_unmerged = 1;
2410 return;
2411 }
2412
2413 same_contents = !hashcmp(one->sha1, two->sha1);
2414
2415 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2416 data->is_binary = 1;
2417 if (same_contents) {
2418 data->added = 0;
2419 data->deleted = 0;
2420 } else {
2421 data->added = diff_filespec_size(two);
2422 data->deleted = diff_filespec_size(one);
2423 }
2424 }
2425
2426 else if (complete_rewrite) {
2427 diff_populate_filespec(one, 0);
2428 diff_populate_filespec(two, 0);
2429 data->deleted = count_lines(one->data, one->size);
2430 data->added = count_lines(two->data, two->size);
2431 }
2432
2433 else if (!same_contents) {
2434 /* Crazy xdl interfaces.. */
2435 xpparam_t xpp;
2436 xdemitconf_t xecfg;
2437
2438 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2439 die("unable to read files to diff");
2440
2441 memset(&xpp, 0, sizeof(xpp));
2442 memset(&xecfg, 0, sizeof(xecfg));
2443 xpp.flags = o->xdl_opts;
2444 xecfg.ctxlen = o->context;
2445 xecfg.interhunkctxlen = o->interhunkcontext;
2446 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2447 &xpp, &xecfg);
2448 }
2449
2450 diff_free_filespec_data(one);
2451 diff_free_filespec_data(two);
2452 }
2453
2454 static void builtin_checkdiff(const char *name_a, const char *name_b,
2455 const char *attr_path,
2456 struct diff_filespec *one,
2457 struct diff_filespec *two,
2458 struct diff_options *o)
2459 {
2460 mmfile_t mf1, mf2;
2461 struct checkdiff_t data;
2462
2463 if (!two)
2464 return;
2465
2466 memset(&data, 0, sizeof(data));
2467 data.filename = name_b ? name_b : name_a;
2468 data.lineno = 0;
2469 data.o = o;
2470 data.ws_rule = whitespace_rule(attr_path);
2471 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2472
2473 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2474 die("unable to read files to diff");
2475
2476 /*
2477 * All the other codepaths check both sides, but not checking
2478 * the "old" side here is deliberate. We are checking the newly
2479 * introduced changes, and as long as the "new" side is text, we
2480 * can and should check what it introduces.
2481 */
2482 if (diff_filespec_is_binary(two))
2483 goto free_and_return;
2484 else {
2485 /* Crazy xdl interfaces.. */
2486 xpparam_t xpp;
2487 xdemitconf_t xecfg;
2488
2489 memset(&xpp, 0, sizeof(xpp));
2490 memset(&xecfg, 0, sizeof(xecfg));
2491 xecfg.ctxlen = 1; /* at least one context line */
2492 xpp.flags = 0;
2493 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2494 &xpp, &xecfg);
2495
2496 if (data.ws_rule & WS_BLANK_AT_EOF) {
2497 struct emit_callback ecbdata;
2498 int blank_at_eof;
2499
2500 ecbdata.ws_rule = data.ws_rule;
2501 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2502 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2503
2504 if (blank_at_eof) {
2505 static char *err;
2506 if (!err)
2507 err = whitespace_error_string(WS_BLANK_AT_EOF);
2508 fprintf(o->file, "%s:%d: %s.\n",
2509 data.filename, blank_at_eof, err);
2510 data.status = 1; /* report errors */
2511 }
2512 }
2513 }
2514 free_and_return:
2515 diff_free_filespec_data(one);
2516 diff_free_filespec_data(two);
2517 if (data.status)
2518 DIFF_OPT_SET(o, CHECK_FAILED);
2519 }
2520
2521 struct diff_filespec *alloc_filespec(const char *path)
2522 {
2523 int namelen = strlen(path);
2524 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2525
2526 memset(spec, 0, sizeof(*spec));
2527 spec->path = (char *)(spec + 1);
2528 memcpy(spec->path, path, namelen+1);
2529 spec->count = 1;
2530 spec->is_binary = -1;
2531 return spec;
2532 }
2533
2534 void free_filespec(struct diff_filespec *spec)
2535 {
2536 if (!--spec->count) {
2537 diff_free_filespec_data(spec);
2538 free(spec);
2539 }
2540 }
2541
2542 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2543 int sha1_valid, unsigned short mode)
2544 {
2545 if (mode) {
2546 spec->mode = canon_mode(mode);
2547 hashcpy(spec->sha1, sha1);
2548 spec->sha1_valid = sha1_valid;
2549 }
2550 }
2551
2552 /*
2553 * Given a name and sha1 pair, if the index tells us the file in
2554 * the work tree has that object contents, return true, so that
2555 * prepare_temp_file() does not have to inflate and extract.
2556 */
2557 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2558 {
2559 struct cache_entry *ce;
2560 struct stat st;
2561 int pos, len;
2562
2563 /*
2564 * We do not read the cache ourselves here, because the
2565 * benchmark with my previous version that always reads cache
2566 * shows that it makes things worse for diff-tree comparing
2567 * two linux-2.6 kernel trees in an already checked out work
2568 * tree. This is because most diff-tree comparisons deal with
2569 * only a small number of files, while reading the cache is
2570 * expensive for a large project, and its cost outweighs the
2571 * savings we get by not inflating the object to a temporary
2572 * file. Practically, this code only helps when we are used
2573 * by diff-cache --cached, which does read the cache before
2574 * calling us.
2575 */
2576 if (!active_cache)
2577 return 0;
2578
2579 /* We want to avoid the working directory if our caller
2580 * doesn't need the data in a normal file, this system
2581 * is rather slow with its stat/open/mmap/close syscalls,
2582 * and the object is contained in a pack file. The pack
2583 * is probably already open and will be faster to obtain
2584 * the data through than the working directory. Loose
2585 * objects however would tend to be slower as they need
2586 * to be individually opened and inflated.
2587 */
2588 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2589 return 0;
2590
2591 len = strlen(name);
2592 pos = cache_name_pos(name, len);
2593 if (pos < 0)
2594 return 0;
2595 ce = active_cache[pos];
2596
2597 /*
2598 * This is not the sha1 we are looking for, or
2599 * unreusable because it is not a regular file.
2600 */
2601 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2602 return 0;
2603
2604 /*
2605 * If ce is marked as "assume unchanged", there is no
2606 * guarantee that work tree matches what we are looking for.
2607 */
2608 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2609 return 0;
2610
2611 /*
2612 * If ce matches the file in the work tree, we can reuse it.
2613 */
2614 if (ce_uptodate(ce) ||
2615 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2616 return 1;
2617
2618 return 0;
2619 }
2620
2621 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2622 {
2623 int len;
2624 char *data = xmalloc(100), *dirty = "";
2625
2626 /* Are we looking at the work tree? */
2627 if (s->dirty_submodule)
2628 dirty = "-dirty";
2629
2630 len = snprintf(data, 100,
2631 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2632 s->data = data;
2633 s->size = len;
2634 s->should_free = 1;
2635 if (size_only) {
2636 s->data = NULL;
2637 free(data);
2638 }
2639 return 0;
2640 }
2641
2642 /*
2643 * While doing rename detection and pickaxe operation, we may need to
2644 * grab the data for the blob (or file) for our own in-core comparison.
2645 * diff_filespec has data and size fields for this purpose.
2646 */
2647 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2648 {
2649 int err = 0;
2650 if (!DIFF_FILE_VALID(s))
2651 die("internal error: asking to populate invalid file.");
2652 if (S_ISDIR(s->mode))
2653 return -1;
2654
2655 if (s->data)
2656 return 0;
2657
2658 if (size_only && 0 < s->size)
2659 return 0;
2660
2661 if (S_ISGITLINK(s->mode))
2662 return diff_populate_gitlink(s, size_only);
2663
2664 if (!s->sha1_valid ||
2665 reuse_worktree_file(s->path, s->sha1, 0)) {
2666 struct strbuf buf = STRBUF_INIT;
2667 struct stat st;
2668 int fd;
2669
2670 if (lstat(s->path, &st) < 0) {
2671 if (errno == ENOENT) {
2672 err_empty:
2673 err = -1;
2674 empty:
2675 s->data = (char *)"";
2676 s->size = 0;
2677 return err;
2678 }
2679 }
2680 s->size = xsize_t(st.st_size);
2681 if (!s->size)
2682 goto empty;
2683 if (S_ISLNK(st.st_mode)) {
2684 struct strbuf sb = STRBUF_INIT;
2685
2686 if (strbuf_readlink(&sb, s->path, s->size))
2687 goto err_empty;
2688 s->size = sb.len;
2689 s->data = strbuf_detach(&sb, NULL);
2690 s->should_free = 1;
2691 return 0;
2692 }
2693 if (size_only)
2694 return 0;
2695 fd = open(s->path, O_RDONLY);
2696 if (fd < 0)
2697 goto err_empty;
2698 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2699 close(fd);
2700 s->should_munmap = 1;
2701
2702 /*
2703 * Convert from working tree format to canonical git format
2704 */
2705 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2706 size_t size = 0;
2707 munmap(s->data, s->size);
2708 s->should_munmap = 0;
2709 s->data = strbuf_detach(&buf, &size);
2710 s->size = size;
2711 s->should_free = 1;
2712 }
2713 }
2714 else {
2715 enum object_type type;
2716 if (size_only) {
2717 type = sha1_object_info(s->sha1, &s->size);
2718 if (type < 0)
2719 die("unable to read %s", sha1_to_hex(s->sha1));
2720 } else {
2721 s->data = read_sha1_file(s->sha1, &type, &s->size);
2722 if (!s->data)
2723 die("unable to read %s", sha1_to_hex(s->sha1));
2724 s->should_free = 1;
2725 }
2726 }
2727 return 0;
2728 }
2729
2730 void diff_free_filespec_blob(struct diff_filespec *s)
2731 {
2732 if (s->should_free)
2733 free(s->data);
2734 else if (s->should_munmap)
2735 munmap(s->data, s->size);
2736
2737 if (s->should_free || s->should_munmap) {
2738 s->should_free = s->should_munmap = 0;
2739 s->data = NULL;
2740 }
2741 }
2742
2743 void diff_free_filespec_data(struct diff_filespec *s)
2744 {
2745 diff_free_filespec_blob(s);
2746 free(s->cnt_data);
2747 s->cnt_data = NULL;
2748 }
2749
2750 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2751 void *blob,
2752 unsigned long size,
2753 const unsigned char *sha1,
2754 int mode)
2755 {
2756 int fd;
2757 struct strbuf buf = STRBUF_INIT;
2758 struct strbuf template = STRBUF_INIT;
2759 char *path_dup = xstrdup(path);
2760 const char *base = basename(path_dup);
2761
2762 /* Generate "XXXXXX_basename.ext" */
2763 strbuf_addstr(&template, "XXXXXX_");
2764 strbuf_addstr(&template, base);
2765
2766 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2767 strlen(base) + 1);
2768 if (fd < 0)
2769 die_errno("unable to create temp-file");
2770 if (convert_to_working_tree(path,
2771 (const char *)blob, (size_t)size, &buf)) {
2772 blob = buf.buf;
2773 size = buf.len;
2774 }
2775 if (write_in_full(fd, blob, size) != size)
2776 die_errno("unable to write temp-file");
2777 close(fd);
2778 temp->name = temp->tmp_path;
2779 strcpy(temp->hex, sha1_to_hex(sha1));
2780 temp->hex[40] = 0;
2781 sprintf(temp->mode, "%06o", mode);
2782 strbuf_release(&buf);
2783 strbuf_release(&template);
2784 free(path_dup);
2785 }
2786
2787 static struct diff_tempfile *prepare_temp_file(const char *name,
2788 struct diff_filespec *one)
2789 {
2790 struct diff_tempfile *temp = claim_diff_tempfile();
2791
2792 if (!DIFF_FILE_VALID(one)) {
2793 not_a_valid_file:
2794 /* A '-' entry produces this for file-2, and
2795 * a '+' entry produces this for file-1.
2796 */
2797 temp->name = "/dev/null";
2798 strcpy(temp->hex, ".");
2799 strcpy(temp->mode, ".");
2800 return temp;
2801 }
2802
2803 if (!remove_tempfile_installed) {
2804 atexit(remove_tempfile);
2805 sigchain_push_common(remove_tempfile_on_signal);
2806 remove_tempfile_installed = 1;
2807 }
2808
2809 if (!one->sha1_valid ||
2810 reuse_worktree_file(name, one->sha1, 1)) {
2811 struct stat st;
2812 if (lstat(name, &st) < 0) {
2813 if (errno == ENOENT)
2814 goto not_a_valid_file;
2815 die_errno("stat(%s)", name);
2816 }
2817 if (S_ISLNK(st.st_mode)) {
2818 struct strbuf sb = STRBUF_INIT;
2819 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2820 die_errno("readlink(%s)", name);
2821 prep_temp_blob(name, temp, sb.buf, sb.len,
2822 (one->sha1_valid ?
2823 one->sha1 : null_sha1),
2824 (one->sha1_valid ?
2825 one->mode : S_IFLNK));
2826 strbuf_release(&sb);
2827 }
2828 else {
2829 /* we can borrow from the file in the work tree */
2830 temp->name = name;
2831 if (!one->sha1_valid)
2832 strcpy(temp->hex, sha1_to_hex(null_sha1));
2833 else
2834 strcpy(temp->hex, sha1_to_hex(one->sha1));
2835 /* Even though we may sometimes borrow the
2836 * contents from the work tree, we always want
2837 * one->mode. mode is trustworthy even when
2838 * !(one->sha1_valid), as long as
2839 * DIFF_FILE_VALID(one).
2840 */
2841 sprintf(temp->mode, "%06o", one->mode);
2842 }
2843 return temp;
2844 }
2845 else {
2846 if (diff_populate_filespec(one, 0))
2847 die("cannot read data blob for %s", one->path);
2848 prep_temp_blob(name, temp, one->data, one->size,
2849 one->sha1, one->mode);
2850 }
2851 return temp;
2852 }
2853
2854 /* An external diff command takes:
2855 *
2856 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2857 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2858 *
2859 */
2860 static void run_external_diff(const char *pgm,
2861 const char *name,
2862 const char *other,
2863 struct diff_filespec *one,
2864 struct diff_filespec *two,
2865 const char *xfrm_msg,
2866 int complete_rewrite)
2867 {
2868 const char *spawn_arg[10];
2869 int retval;
2870 const char **arg = &spawn_arg[0];
2871
2872 if (one && two) {
2873 struct diff_tempfile *temp_one, *temp_two;
2874 const char *othername = (other ? other : name);
2875 temp_one = prepare_temp_file(name, one);
2876 temp_two = prepare_temp_file(othername, two);
2877 *arg++ = pgm;
2878 *arg++ = name;
2879 *arg++ = temp_one->name;
2880 *arg++ = temp_one->hex;
2881 *arg++ = temp_one->mode;
2882 *arg++ = temp_two->name;
2883 *arg++ = temp_two->hex;
2884 *arg++ = temp_two->mode;
2885 if (other) {
2886 *arg++ = other;
2887 *arg++ = xfrm_msg;
2888 }
2889 } else {
2890 *arg++ = pgm;
2891 *arg++ = name;
2892 }
2893 *arg = NULL;
2894 fflush(NULL);
2895 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2896 remove_tempfile();
2897 if (retval) {
2898 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2899 exit(1);
2900 }
2901 }
2902
2903 static int similarity_index(struct diff_filepair *p)
2904 {
2905 return p->score * 100 / MAX_SCORE;
2906 }
2907
2908 static void fill_metainfo(struct strbuf *msg,
2909 const char *name,
2910 const char *other,
2911 struct diff_filespec *one,
2912 struct diff_filespec *two,
2913 struct diff_options *o,
2914 struct diff_filepair *p,
2915 int *must_show_header,
2916 int use_color)
2917 {
2918 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2919 const char *reset = diff_get_color(use_color, DIFF_RESET);
2920 struct strbuf *msgbuf;
2921 char *line_prefix = "";
2922
2923 *must_show_header = 1;
2924 if (o->output_prefix) {
2925 msgbuf = o->output_prefix(o, o->output_prefix_data);
2926 line_prefix = msgbuf->buf;
2927 }
2928 strbuf_init(msg, PATH_MAX * 2 + 300);
2929 switch (p->status) {
2930 case DIFF_STATUS_COPIED:
2931 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2932 line_prefix, set, similarity_index(p));
2933 strbuf_addf(msg, "%s\n%s%scopy from ",
2934 reset, line_prefix, set);
2935 quote_c_style(name, msg, NULL, 0);
2936 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2937 quote_c_style(other, msg, NULL, 0);
2938 strbuf_addf(msg, "%s\n", reset);
2939 break;
2940 case DIFF_STATUS_RENAMED:
2941 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2942 line_prefix, set, similarity_index(p));
2943 strbuf_addf(msg, "%s\n%s%srename from ",
2944 reset, line_prefix, set);
2945 quote_c_style(name, msg, NULL, 0);
2946 strbuf_addf(msg, "%s\n%s%srename to ",
2947 reset, line_prefix, set);
2948 quote_c_style(other, msg, NULL, 0);
2949 strbuf_addf(msg, "%s\n", reset);
2950 break;
2951 case DIFF_STATUS_MODIFIED:
2952 if (p->score) {
2953 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2954 line_prefix,
2955 set, similarity_index(p), reset);
2956 break;
2957 }
2958 /* fallthru */
2959 default:
2960 *must_show_header = 0;
2961 }
2962 if (one && two && hashcmp(one->sha1, two->sha1)) {
2963 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2964
2965 if (DIFF_OPT_TST(o, BINARY)) {
2966 mmfile_t mf;
2967 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2968 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2969 abbrev = 40;
2970 }
2971 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2972 find_unique_abbrev(one->sha1, abbrev));
2973 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2974 if (one->mode == two->mode)
2975 strbuf_addf(msg, " %06o", one->mode);
2976 strbuf_addf(msg, "%s\n", reset);
2977 }
2978 }
2979
2980 static void run_diff_cmd(const char *pgm,
2981 const char *name,
2982 const char *other,
2983 const char *attr_path,
2984 struct diff_filespec *one,
2985 struct diff_filespec *two,
2986 struct strbuf *msg,
2987 struct diff_options *o,
2988 struct diff_filepair *p)
2989 {
2990 const char *xfrm_msg = NULL;
2991 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2992 int must_show_header = 0;
2993
2994
2995 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
2996 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2997 if (drv && drv->external)
2998 pgm = drv->external;
2999 }
3000
3001 if (msg) {
3002 /*
3003 * don't use colors when the header is intended for an
3004 * external diff driver
3005 */
3006 fill_metainfo(msg, name, other, one, two, o, p,
3007 &must_show_header,
3008 want_color(o->use_color) && !pgm);
3009 xfrm_msg = msg->len ? msg->buf : NULL;
3010 }
3011
3012 if (pgm) {
3013 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3014 complete_rewrite);
3015 return;
3016 }
3017 if (one && two)
3018 builtin_diff(name, other ? other : name,
3019 one, two, xfrm_msg, must_show_header,
3020 o, complete_rewrite);
3021 else
3022 fprintf(o->file, "* Unmerged path %s\n", name);
3023 }
3024
3025 static void diff_fill_sha1_info(struct diff_filespec *one)
3026 {
3027 if (DIFF_FILE_VALID(one)) {
3028 if (!one->sha1_valid) {
3029 struct stat st;
3030 if (one->is_stdin) {
3031 hashcpy(one->sha1, null_sha1);
3032 return;
3033 }
3034 if (lstat(one->path, &st) < 0)
3035 die_errno("stat '%s'", one->path);
3036 if (index_path(one->sha1, one->path, &st, 0))
3037 die("cannot hash %s", one->path);
3038 }
3039 }
3040 else
3041 hashclr(one->sha1);
3042 }
3043
3044 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3045 {
3046 /* Strip the prefix but do not molest /dev/null and absolute paths */
3047 if (*namep && **namep != '/') {
3048 *namep += prefix_length;
3049 if (**namep == '/')
3050 ++*namep;
3051 }
3052 if (*otherp && **otherp != '/') {
3053 *otherp += prefix_length;
3054 if (**otherp == '/')
3055 ++*otherp;
3056 }
3057 }
3058
3059 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3060 {
3061 const char *pgm = external_diff();
3062 struct strbuf msg;
3063 struct diff_filespec *one = p->one;
3064 struct diff_filespec *two = p->two;
3065 const char *name;
3066 const char *other;
3067 const char *attr_path;
3068
3069 name = p->one->path;
3070 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3071 attr_path = name;
3072 if (o->prefix_length)
3073 strip_prefix(o->prefix_length, &name, &other);
3074
3075 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3076 pgm = NULL;
3077
3078 if (DIFF_PAIR_UNMERGED(p)) {
3079 run_diff_cmd(pgm, name, NULL, attr_path,
3080 NULL, NULL, NULL, o, p);
3081 return;
3082 }
3083
3084 diff_fill_sha1_info(one);
3085 diff_fill_sha1_info(two);
3086
3087 if (!pgm &&
3088 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3089 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3090 /*
3091 * a filepair that changes between file and symlink
3092 * needs to be split into deletion and creation.
3093 */
3094 struct diff_filespec *null = alloc_filespec(two->path);
3095 run_diff_cmd(NULL, name, other, attr_path,
3096 one, null, &msg, o, p);
3097 free(null);
3098 strbuf_release(&msg);
3099
3100 null = alloc_filespec(one->path);
3101 run_diff_cmd(NULL, name, other, attr_path,
3102 null, two, &msg, o, p);
3103 free(null);
3104 }
3105 else
3106 run_diff_cmd(pgm, name, other, attr_path,
3107 one, two, &msg, o, p);
3108
3109 strbuf_release(&msg);
3110 }
3111
3112 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3113 struct diffstat_t *diffstat)
3114 {
3115 const char *name;
3116 const char *other;
3117 int complete_rewrite = 0;
3118
3119 if (DIFF_PAIR_UNMERGED(p)) {
3120 /* unmerged */
3121 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
3122 return;
3123 }
3124
3125 name = p->one->path;
3126 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3127
3128 if (o->prefix_length)
3129 strip_prefix(o->prefix_length, &name, &other);
3130
3131 diff_fill_sha1_info(p->one);
3132 diff_fill_sha1_info(p->two);
3133
3134 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3135 complete_rewrite = 1;
3136 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
3137 }
3138
3139 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3140 {
3141 const char *name;
3142 const char *other;
3143 const char *attr_path;
3144
3145 if (DIFF_PAIR_UNMERGED(p)) {
3146 /* unmerged */
3147 return;
3148 }
3149
3150 name = p->one->path;
3151 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3152 attr_path = other ? other : name;
3153
3154 if (o->prefix_length)
3155 strip_prefix(o->prefix_length, &name, &other);
3156
3157 diff_fill_sha1_info(p->one);
3158 diff_fill_sha1_info(p->two);
3159
3160 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3161 }
3162
3163 void diff_setup(struct diff_options *options)
3164 {
3165 memcpy(options, &default_diff_options, sizeof(*options));
3166
3167 options->file = stdout;
3168
3169 options->line_termination = '\n';
3170 options->break_opt = -1;
3171 options->rename_limit = -1;
3172 options->dirstat_permille = diff_dirstat_permille_default;
3173 options->context = 3;
3174 DIFF_OPT_SET(options, RENAME_EMPTY);
3175
3176 options->change = diff_change;
3177 options->add_remove = diff_addremove;
3178 options->use_color = diff_use_color_default;
3179 options->detect_rename = diff_detect_rename_default;
3180
3181 if (diff_no_prefix) {
3182 options->a_prefix = options->b_prefix = "";
3183 } else if (!diff_mnemonic_prefix) {
3184 options->a_prefix = "a/";
3185 options->b_prefix = "b/";
3186 }
3187 }
3188
3189 void diff_setup_done(struct diff_options *options)
3190 {
3191 int count = 0;
3192
3193 if (options->output_format & DIFF_FORMAT_NAME)
3194 count++;
3195 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3196 count++;
3197 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3198 count++;
3199 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3200 count++;
3201 if (count > 1)
3202 die("--name-only, --name-status, --check and -s are mutually exclusive");
3203
3204 /*
3205 * Most of the time we can say "there are changes"
3206 * only by checking if there are changed paths, but
3207 * --ignore-whitespace* options force us to look
3208 * inside contents.
3209 */
3210
3211 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3212 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3213 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3214 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3215 else
3216 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3217
3218 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3219 options->detect_rename = DIFF_DETECT_COPY;
3220
3221 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3222 options->prefix = NULL;
3223 if (options->prefix)
3224 options->prefix_length = strlen(options->prefix);
3225 else
3226 options->prefix_length = 0;
3227
3228 if (options->output_format & (DIFF_FORMAT_NAME |
3229 DIFF_FORMAT_NAME_STATUS |
3230 DIFF_FORMAT_CHECKDIFF |
3231 DIFF_FORMAT_NO_OUTPUT))
3232 options->output_format &= ~(DIFF_FORMAT_RAW |
3233 DIFF_FORMAT_NUMSTAT |
3234 DIFF_FORMAT_DIFFSTAT |
3235 DIFF_FORMAT_SHORTSTAT |
3236 DIFF_FORMAT_DIRSTAT |
3237 DIFF_FORMAT_SUMMARY |
3238 DIFF_FORMAT_PATCH);
3239
3240 /*
3241 * These cases always need recursive; we do not drop caller-supplied
3242 * recursive bits for other formats here.
3243 */
3244 if (options->output_format & (DIFF_FORMAT_PATCH |
3245 DIFF_FORMAT_NUMSTAT |
3246 DIFF_FORMAT_DIFFSTAT |
3247 DIFF_FORMAT_SHORTSTAT |
3248 DIFF_FORMAT_DIRSTAT |
3249 DIFF_FORMAT_SUMMARY |
3250 DIFF_FORMAT_CHECKDIFF))
3251 DIFF_OPT_SET(options, RECURSIVE);
3252 /*
3253 * Also pickaxe would not work very well if you do not say recursive
3254 */
3255 if (options->pickaxe)
3256 DIFF_OPT_SET(options, RECURSIVE);
3257 /*
3258 * When patches are generated, submodules diffed against the work tree
3259 * must be checked for dirtiness too so it can be shown in the output
3260 */
3261 if (options->output_format & DIFF_FORMAT_PATCH)
3262 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3263
3264 if (options->detect_rename && options->rename_limit < 0)
3265 options->rename_limit = diff_rename_limit_default;
3266 if (options->setup & DIFF_SETUP_USE_CACHE) {
3267 if (!active_cache)
3268 /* read-cache does not die even when it fails
3269 * so it is safe for us to do this here. Also
3270 * it does not smudge active_cache or active_nr
3271 * when it fails, so we do not have to worry about
3272 * cleaning it up ourselves either.
3273 */
3274 read_cache();
3275 }
3276 if (options->abbrev <= 0 || 40 < options->abbrev)
3277 options->abbrev = 40; /* full */
3278
3279 /*
3280 * It does not make sense to show the first hit we happened
3281 * to have found. It does not make sense not to return with
3282 * exit code in such a case either.
3283 */
3284 if (DIFF_OPT_TST(options, QUICK)) {
3285 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3286 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3287 }
3288 }
3289
3290 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3291 {
3292 char c, *eq;
3293 int len;
3294
3295 if (*arg != '-')
3296 return 0;
3297 c = *++arg;
3298 if (!c)
3299 return 0;
3300 if (c == arg_short) {
3301 c = *++arg;
3302 if (!c)
3303 return 1;
3304 if (val && isdigit(c)) {
3305 char *end;
3306 int n = strtoul(arg, &end, 10);
3307 if (*end)
3308 return 0;
3309 *val = n;
3310 return 1;
3311 }
3312 return 0;
3313 }
3314 if (c != '-')
3315 return 0;
3316 arg++;
3317 eq = strchr(arg, '=');
3318 if (eq)
3319 len = eq - arg;
3320 else
3321 len = strlen(arg);
3322 if (!len || strncmp(arg, arg_long, len))
3323 return 0;
3324 if (eq) {
3325 int n;
3326 char *end;
3327 if (!isdigit(*++eq))
3328 return 0;
3329 n = strtoul(eq, &end, 10);
3330 if (*end)
3331 return 0;
3332 *val = n;
3333 }
3334 return 1;
3335 }
3336
3337 static int diff_scoreopt_parse(const char *opt);
3338
3339 static inline int short_opt(char opt, const char **argv,
3340 const char **optarg)
3341 {
3342 const char *arg = argv[0];
3343 if (arg[0] != '-' || arg[1] != opt)
3344 return 0;
3345 if (arg[2] != '\0') {
3346 *optarg = arg + 2;
3347 return 1;
3348 }
3349 if (!argv[1])
3350 die("Option '%c' requires a value", opt);
3351 *optarg = argv[1];
3352 return 2;
3353 }
3354
3355 int parse_long_opt(const char *opt, const char **argv,
3356 const char **optarg)
3357 {
3358 const char *arg = argv[0];
3359 if (arg[0] != '-' || arg[1] != '-')
3360 return 0;
3361 arg += strlen("--");
3362 if (prefixcmp(arg, opt))
3363 return 0;
3364 arg += strlen(opt);
3365 if (*arg == '=') { /* sticked form: --option=value */
3366 *optarg = arg + 1;
3367 return 1;
3368 }
3369 if (*arg != '\0')
3370 return 0;
3371 /* separate form: --option value */
3372 if (!argv[1])
3373 die("Option '--%s' requires a value", opt);
3374 *optarg = argv[1];
3375 return 2;
3376 }
3377
3378 static int stat_opt(struct diff_options *options, const char **av)
3379 {
3380 const char *arg = av[0];
3381 char *end;
3382 int width = options->stat_width;
3383 int name_width = options->stat_name_width;
3384 int graph_width = options->stat_graph_width;
3385 int count = options->stat_count;
3386 int argcount = 1;
3387
3388 arg += strlen("--stat");
3389 end = (char *)arg;
3390
3391 switch (*arg) {
3392 case '-':
3393 if (!prefixcmp(arg, "-width")) {
3394 arg += strlen("-width");
3395 if (*arg == '=')
3396 width = strtoul(arg + 1, &end, 10);
3397 else if (!*arg && !av[1])
3398 die("Option '--stat-width' requires a value");
3399 else if (!*arg) {
3400 width = strtoul(av[1], &end, 10);
3401 argcount = 2;
3402 }
3403 } else if (!prefixcmp(arg, "-name-width")) {
3404 arg += strlen("-name-width");
3405 if (*arg == '=')
3406 name_width = strtoul(arg + 1, &end, 10);
3407 else if (!*arg && !av[1])
3408 die("Option '--stat-name-width' requires a value");
3409 else if (!*arg) {
3410 name_width = strtoul(av[1], &end, 10);
3411 argcount = 2;
3412 }
3413 } else if (!prefixcmp(arg, "-graph-width")) {
3414 arg += strlen("-graph-width");
3415 if (*arg == '=')
3416 graph_width = strtoul(arg + 1, &end, 10);
3417 else if (!*arg && !av[1])
3418 die("Option '--stat-graph-width' requires a value");
3419 else if (!*arg) {
3420 graph_width = strtoul(av[1], &end, 10);
3421 argcount = 2;
3422 }
3423 } else if (!prefixcmp(arg, "-count")) {
3424 arg += strlen("-count");
3425 if (*arg == '=')
3426 count = strtoul(arg + 1, &end, 10);
3427 else if (!*arg && !av[1])
3428 die("Option '--stat-count' requires a value");
3429 else if (!*arg) {
3430 count = strtoul(av[1], &end, 10);
3431 argcount = 2;
3432 }
3433 }
3434 break;
3435 case '=':
3436 width = strtoul(arg+1, &end, 10);
3437 if (*end == ',')
3438 name_width = strtoul(end+1, &end, 10);
3439 if (*end == ',')
3440 count = strtoul(end+1, &end, 10);
3441 }
3442
3443 /* Important! This checks all the error cases! */
3444 if (*end)
3445 return 0;
3446 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3447 options->stat_name_width = name_width;
3448 options->stat_graph_width = graph_width;
3449 options->stat_width = width;
3450 options->stat_count = count;
3451 return argcount;
3452 }
3453
3454 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3455 {
3456 struct strbuf errmsg = STRBUF_INIT;
3457 if (parse_dirstat_params(options, params, &errmsg))
3458 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3459 errmsg.buf);
3460 strbuf_release(&errmsg);
3461 /*
3462 * The caller knows a dirstat-related option is given from the command
3463 * line; allow it to say "return this_function();"
3464 */
3465 options->output_format |= DIFF_FORMAT_DIRSTAT;
3466 return 1;
3467 }
3468
3469 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3470 {
3471 const char *arg = av[0];
3472 const char *optarg;
3473 int argcount;
3474
3475 /* Output format options */
3476 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3477 options->output_format |= DIFF_FORMAT_PATCH;
3478 else if (opt_arg(arg, 'U', "unified", &options->context))
3479 options->output_format |= DIFF_FORMAT_PATCH;
3480 else if (!strcmp(arg, "--raw"))
3481 options->output_format |= DIFF_FORMAT_RAW;
3482 else if (!strcmp(arg, "--patch-with-raw"))
3483 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3484 else if (!strcmp(arg, "--numstat"))
3485 options->output_format |= DIFF_FORMAT_NUMSTAT;
3486 else if (!strcmp(arg, "--shortstat"))
3487 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3488 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3489 return parse_dirstat_opt(options, "");
3490 else if (!prefixcmp(arg, "-X"))
3491 return parse_dirstat_opt(options, arg + 2);
3492 else if (!prefixcmp(arg, "--dirstat="))
3493 return parse_dirstat_opt(options, arg + 10);
3494 else if (!strcmp(arg, "--cumulative"))
3495 return parse_dirstat_opt(options, "cumulative");
3496 else if (!strcmp(arg, "--dirstat-by-file"))
3497 return parse_dirstat_opt(options, "files");
3498 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3499 parse_dirstat_opt(options, "files");
3500 return parse_dirstat_opt(options, arg + 18);
3501 }
3502 else if (!strcmp(arg, "--check"))
3503 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3504 else if (!strcmp(arg, "--summary"))
3505 options->output_format |= DIFF_FORMAT_SUMMARY;
3506 else if (!strcmp(arg, "--patch-with-stat"))
3507 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3508 else if (!strcmp(arg, "--name-only"))
3509 options->output_format |= DIFF_FORMAT_NAME;
3510 else if (!strcmp(arg, "--name-status"))
3511 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3512 else if (!strcmp(arg, "-s"))
3513 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3514 else if (!prefixcmp(arg, "--stat"))
3515 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3516 return stat_opt(options, av);
3517
3518 /* renames options */
3519 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3520 !strcmp(arg, "--break-rewrites")) {
3521 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3522 return error("invalid argument to -B: %s", arg+2);
3523 }
3524 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3525 !strcmp(arg, "--find-renames")) {
3526 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3527 return error("invalid argument to -M: %s", arg+2);
3528 options->detect_rename = DIFF_DETECT_RENAME;
3529 }
3530 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3531 options->irreversible_delete = 1;
3532 }
3533 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3534 !strcmp(arg, "--find-copies")) {
3535 if (options->detect_rename == DIFF_DETECT_COPY)
3536 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3537 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3538 return error("invalid argument to -C: %s", arg+2);
3539 options->detect_rename = DIFF_DETECT_COPY;
3540 }
3541 else if (!strcmp(arg, "--no-renames"))
3542 options->detect_rename = 0;
3543 else if (!strcmp(arg, "--rename-empty"))
3544 DIFF_OPT_SET(options, RENAME_EMPTY);
3545 else if (!strcmp(arg, "--no-rename-empty"))
3546 DIFF_OPT_CLR(options, RENAME_EMPTY);
3547 else if (!strcmp(arg, "--relative"))
3548 DIFF_OPT_SET(options, RELATIVE_NAME);
3549 else if (!prefixcmp(arg, "--relative=")) {
3550 DIFF_OPT_SET(options, RELATIVE_NAME);
3551 options->prefix = arg + 11;
3552 }
3553
3554 /* xdiff options */
3555 else if (!strcmp(arg, "--minimal"))
3556 DIFF_XDL_SET(options, NEED_MINIMAL);
3557 else if (!strcmp(arg, "--no-minimal"))
3558 DIFF_XDL_CLR(options, NEED_MINIMAL);
3559 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3560 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3561 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3562 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3563 else if (!strcmp(arg, "--ignore-space-at-eol"))
3564 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3565 else if (!strcmp(arg, "--patience"))
3566 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3567 else if (!strcmp(arg, "--histogram"))
3568 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3569
3570 /* flags options */
3571 else if (!strcmp(arg, "--binary")) {
3572 options->output_format |= DIFF_FORMAT_PATCH;
3573 DIFF_OPT_SET(options, BINARY);
3574 }
3575 else if (!strcmp(arg, "--full-index"))
3576 DIFF_OPT_SET(options, FULL_INDEX);
3577 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3578 DIFF_OPT_SET(options, TEXT);
3579 else if (!strcmp(arg, "-R"))
3580 DIFF_OPT_SET(options, REVERSE_DIFF);
3581 else if (!strcmp(arg, "--find-copies-harder"))
3582 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3583 else if (!strcmp(arg, "--follow"))
3584 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3585 else if (!strcmp(arg, "--color"))
3586 options->use_color = 1;
3587 else if (!prefixcmp(arg, "--color=")) {
3588 int value = git_config_colorbool(NULL, arg+8);
3589 if (value < 0)
3590 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3591 options->use_color = value;
3592 }
3593 else if (!strcmp(arg, "--no-color"))
3594 options->use_color = 0;
3595 else if (!strcmp(arg, "--color-words")) {
3596 options->use_color = 1;
3597 options->word_diff = DIFF_WORDS_COLOR;
3598 }
3599 else if (!prefixcmp(arg, "--color-words=")) {
3600 options->use_color = 1;
3601 options->word_diff = DIFF_WORDS_COLOR;
3602 options->word_regex = arg + 14;
3603 }
3604 else if (!strcmp(arg, "--word-diff")) {
3605 if (options->word_diff == DIFF_WORDS_NONE)
3606 options->word_diff = DIFF_WORDS_PLAIN;
3607 }
3608 else if (!prefixcmp(arg, "--word-diff=")) {
3609 const char *type = arg + 12;
3610 if (!strcmp(type, "plain"))
3611 options->word_diff = DIFF_WORDS_PLAIN;
3612 else if (!strcmp(type, "color")) {
3613 options->use_color = 1;
3614 options->word_diff = DIFF_WORDS_COLOR;
3615 }
3616 else if (!strcmp(type, "porcelain"))
3617 options->word_diff = DIFF_WORDS_PORCELAIN;
3618 else if (!strcmp(type, "none"))
3619 options->word_diff = DIFF_WORDS_NONE;
3620 else
3621 die("bad --word-diff argument: %s", type);
3622 }
3623 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3624 if (options->word_diff == DIFF_WORDS_NONE)
3625 options->word_diff = DIFF_WORDS_PLAIN;
3626 options->word_regex = optarg;
3627 return argcount;
3628 }
3629 else if (!strcmp(arg, "--exit-code"))
3630 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3631 else if (!strcmp(arg, "--quiet"))
3632 DIFF_OPT_SET(options, QUICK);
3633 else if (!strcmp(arg, "--ext-diff"))
3634 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3635 else if (!strcmp(arg, "--no-ext-diff"))
3636 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3637 else if (!strcmp(arg, "--textconv"))
3638 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3639 else if (!strcmp(arg, "--no-textconv"))
3640 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3641 else if (!strcmp(arg, "--ignore-submodules")) {
3642 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3643 handle_ignore_submodules_arg(options, "all");
3644 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3645 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3646 handle_ignore_submodules_arg(options, arg + 20);
3647 } else if (!strcmp(arg, "--submodule"))
3648 DIFF_OPT_SET(options, SUBMODULE_LOG);
3649 else if (!prefixcmp(arg, "--submodule=")) {
3650 if (!strcmp(arg + 12, "log"))
3651 DIFF_OPT_SET(options, SUBMODULE_LOG);
3652 }
3653
3654 /* misc options */
3655 else if (!strcmp(arg, "-z"))
3656 options->line_termination = 0;
3657 else if ((argcount = short_opt('l', av, &optarg))) {
3658 options->rename_limit = strtoul(optarg, NULL, 10);
3659 return argcount;
3660 }
3661 else if ((argcount = short_opt('S', av, &optarg))) {
3662 options->pickaxe = optarg;
3663 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3664 return argcount;
3665 } else if ((argcount = short_opt('G', av, &optarg))) {
3666 options->pickaxe = optarg;
3667 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3668 return argcount;
3669 }
3670 else if (!strcmp(arg, "--pickaxe-all"))
3671 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3672 else if (!strcmp(arg, "--pickaxe-regex"))
3673 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3674 else if ((argcount = short_opt('O', av, &optarg))) {
3675 options->orderfile = optarg;
3676 return argcount;
3677 }
3678 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3679 options->filter = optarg;
3680 return argcount;
3681 }
3682 else if (!strcmp(arg, "--abbrev"))
3683 options->abbrev = DEFAULT_ABBREV;
3684 else if (!prefixcmp(arg, "--abbrev=")) {
3685 options->abbrev = strtoul(arg + 9, NULL, 10);
3686 if (options->abbrev < MINIMUM_ABBREV)
3687 options->abbrev = MINIMUM_ABBREV;
3688 else if (40 < options->abbrev)
3689 options->abbrev = 40;
3690 }
3691 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3692 options->a_prefix = optarg;
3693 return argcount;
3694 }
3695 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3696 options->b_prefix = optarg;
3697 return argcount;
3698 }
3699 else if (!strcmp(arg, "--no-prefix"))
3700 options->a_prefix = options->b_prefix = "";
3701 else if (opt_arg(arg, '\0', "inter-hunk-context",
3702 &options->interhunkcontext))
3703 ;
3704 else if (!strcmp(arg, "-W"))
3705 DIFF_OPT_SET(options, FUNCCONTEXT);
3706 else if (!strcmp(arg, "--function-context"))
3707 DIFF_OPT_SET(options, FUNCCONTEXT);
3708 else if (!strcmp(arg, "--no-function-context"))
3709 DIFF_OPT_CLR(options, FUNCCONTEXT);
3710 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3711 options->file = fopen(optarg, "w");
3712 if (!options->file)
3713 die_errno("Could not open '%s'", optarg);
3714 options->close_file = 1;
3715 return argcount;
3716 } else
3717 return 0;
3718 return 1;
3719 }
3720
3721 int parse_rename_score(const char **cp_p)
3722 {
3723 unsigned long num, scale;
3724 int ch, dot;
3725 const char *cp = *cp_p;
3726
3727 num = 0;
3728 scale = 1;
3729 dot = 0;
3730 for (;;) {
3731 ch = *cp;
3732 if ( !dot && ch == '.' ) {
3733 scale = 1;
3734 dot = 1;
3735 } else if ( ch == '%' ) {
3736 scale = dot ? scale*100 : 100;
3737 cp++; /* % is always at the end */
3738 break;
3739 } else if ( ch >= '0' && ch <= '9' ) {
3740 if ( scale < 100000 ) {
3741 scale *= 10;
3742 num = (num*10) + (ch-'0');
3743 }
3744 } else {
3745 break;
3746 }
3747 cp++;
3748 }
3749 *cp_p = cp;
3750
3751 /* user says num divided by scale and we say internally that
3752 * is MAX_SCORE * num / scale.
3753 */
3754 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3755 }
3756
3757 static int diff_scoreopt_parse(const char *opt)
3758 {
3759 int opt1, opt2, cmd;
3760
3761 if (*opt++ != '-')
3762 return -1;
3763 cmd = *opt++;
3764 if (cmd == '-') {
3765 /* convert the long-form arguments into short-form versions */
3766 if (!prefixcmp(opt, "break-rewrites")) {
3767 opt += strlen("break-rewrites");
3768 if (*opt == 0 || *opt++ == '=')
3769 cmd = 'B';
3770 } else if (!prefixcmp(opt, "find-copies")) {
3771 opt += strlen("find-copies");
3772 if (*opt == 0 || *opt++ == '=')
3773 cmd = 'C';
3774 } else if (!prefixcmp(opt, "find-renames")) {
3775 opt += strlen("find-renames");
3776 if (*opt == 0 || *opt++ == '=')
3777 cmd = 'M';
3778 }
3779 }
3780 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3781 return -1; /* that is not a -M, -C nor -B option */
3782
3783 opt1 = parse_rename_score(&opt);
3784 if (cmd != 'B')
3785 opt2 = 0;
3786 else {
3787 if (*opt == 0)
3788 opt2 = 0;
3789 else if (*opt != '/')
3790 return -1; /* we expect -B80/99 or -B80 */
3791 else {
3792 opt++;
3793 opt2 = parse_rename_score(&opt);
3794 }
3795 }
3796 if (*opt != 0)
3797 return -1;
3798 return opt1 | (opt2 << 16);
3799 }
3800
3801 struct diff_queue_struct diff_queued_diff;
3802
3803 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3804 {
3805 if (queue->alloc <= queue->nr) {
3806 queue->alloc = alloc_nr(queue->alloc);
3807 queue->queue = xrealloc(queue->queue,
3808 sizeof(dp) * queue->alloc);
3809 }
3810 queue->queue[queue->nr++] = dp;
3811 }
3812
3813 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3814 struct diff_filespec *one,
3815 struct diff_filespec *two)
3816 {
3817 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3818 dp->one = one;
3819 dp->two = two;
3820 if (queue)
3821 diff_q(queue, dp);
3822 return dp;
3823 }
3824
3825 void diff_free_filepair(struct diff_filepair *p)
3826 {
3827 free_filespec(p->one);
3828 free_filespec(p->two);
3829 free(p);
3830 }
3831
3832 /* This is different from find_unique_abbrev() in that
3833 * it stuffs the result with dots for alignment.
3834 */
3835 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3836 {
3837 int abblen;
3838 const char *abbrev;
3839 if (len == 40)
3840 return sha1_to_hex(sha1);
3841
3842 abbrev = find_unique_abbrev(sha1, len);
3843 abblen = strlen(abbrev);
3844 if (abblen < 37) {
3845 static char hex[41];
3846 if (len < abblen && abblen <= len + 2)
3847 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3848 else
3849 sprintf(hex, "%s...", abbrev);
3850 return hex;
3851 }
3852 return sha1_to_hex(sha1);
3853 }
3854
3855 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3856 {
3857 int line_termination = opt->line_termination;
3858 int inter_name_termination = line_termination ? '\t' : '\0';
3859 if (opt->output_prefix) {
3860 struct strbuf *msg = NULL;
3861 msg = opt->output_prefix(opt, opt->output_prefix_data);
3862 fprintf(opt->file, "%s", msg->buf);
3863 }
3864
3865 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3866 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3867 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3868 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3869 }
3870 if (p->score) {
3871 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3872 inter_name_termination);
3873 } else {
3874 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3875 }
3876
3877 if (p->status == DIFF_STATUS_COPIED ||
3878 p->status == DIFF_STATUS_RENAMED) {
3879 const char *name_a, *name_b;
3880 name_a = p->one->path;
3881 name_b = p->two->path;
3882 strip_prefix(opt->prefix_length, &name_a, &name_b);
3883 write_name_quoted(name_a, opt->file, inter_name_termination);
3884 write_name_quoted(name_b, opt->file, line_termination);
3885 } else {
3886 const char *name_a, *name_b;
3887 name_a = p->one->mode ? p->one->path : p->two->path;
3888 name_b = NULL;
3889 strip_prefix(opt->prefix_length, &name_a, &name_b);
3890 write_name_quoted(name_a, opt->file, line_termination);
3891 }
3892 }
3893
3894 int diff_unmodified_pair(struct diff_filepair *p)
3895 {
3896 /* This function is written stricter than necessary to support
3897 * the currently implemented transformers, but the idea is to
3898 * let transformers to produce diff_filepairs any way they want,
3899 * and filter and clean them up here before producing the output.
3900 */
3901 struct diff_filespec *one = p->one, *two = p->two;
3902
3903 if (DIFF_PAIR_UNMERGED(p))
3904 return 0; /* unmerged is interesting */
3905
3906 /* deletion, addition, mode or type change
3907 * and rename are all interesting.
3908 */
3909 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3910 DIFF_PAIR_MODE_CHANGED(p) ||
3911 strcmp(one->path, two->path))
3912 return 0;
3913
3914 /* both are valid and point at the same path. that is, we are
3915 * dealing with a change.
3916 */
3917 if (one->sha1_valid && two->sha1_valid &&
3918 !hashcmp(one->sha1, two->sha1) &&
3919 !one->dirty_submodule && !two->dirty_submodule)
3920 return 1; /* no change */
3921 if (!one->sha1_valid && !two->sha1_valid)
3922 return 1; /* both look at the same file on the filesystem. */
3923 return 0;
3924 }
3925
3926 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3927 {
3928 if (diff_unmodified_pair(p))
3929 return;
3930
3931 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3932 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3933 return; /* no tree diffs in patch format */
3934
3935 run_diff(p, o);
3936 }
3937
3938 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3939 struct diffstat_t *diffstat)
3940 {
3941 if (diff_unmodified_pair(p))
3942 return;
3943
3944 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3945 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3946 return; /* no useful stat for tree diffs */
3947
3948 run_diffstat(p, o, diffstat);
3949 }
3950
3951 static void diff_flush_checkdiff(struct diff_filepair *p,
3952 struct diff_options *o)
3953 {
3954 if (diff_unmodified_pair(p))
3955 return;
3956
3957 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3958 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3959 return; /* nothing to check in tree diffs */
3960
3961 run_checkdiff(p, o);
3962 }
3963
3964 int diff_queue_is_empty(void)
3965 {
3966 struct diff_queue_struct *q = &diff_queued_diff;
3967 int i;
3968 for (i = 0; i < q->nr; i++)
3969 if (!diff_unmodified_pair(q->queue[i]))
3970 return 0;
3971 return 1;
3972 }
3973
3974 #if DIFF_DEBUG
3975 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3976 {
3977 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3978 x, one ? one : "",
3979 s->path,
3980 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3981 s->mode,
3982 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3983 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3984 x, one ? one : "",
3985 s->size, s->xfrm_flags);
3986 }
3987
3988 void diff_debug_filepair(const struct diff_filepair *p, int i)
3989 {
3990 diff_debug_filespec(p->one, i, "one");
3991 diff_debug_filespec(p->two, i, "two");
3992 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3993 p->score, p->status ? p->status : '?',
3994 p->one->rename_used, p->broken_pair);
3995 }
3996
3997 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3998 {
3999 int i;
4000 if (msg)
4001 fprintf(stderr, "%s\n", msg);
4002 fprintf(stderr, "q->nr = %d\n", q->nr);
4003 for (i = 0; i < q->nr; i++) {
4004 struct diff_filepair *p = q->queue[i];
4005 diff_debug_filepair(p, i);
4006 }
4007 }
4008 #endif
4009
4010 static void diff_resolve_rename_copy(void)
4011 {
4012 int i;
4013 struct diff_filepair *p;
4014 struct diff_queue_struct *q = &diff_queued_diff;
4015
4016 diff_debug_queue("resolve-rename-copy", q);
4017
4018 for (i = 0; i < q->nr; i++) {
4019 p = q->queue[i];
4020 p->status = 0; /* undecided */
4021 if (DIFF_PAIR_UNMERGED(p))
4022 p->status = DIFF_STATUS_UNMERGED;
4023 else if (!DIFF_FILE_VALID(p->one))
4024 p->status = DIFF_STATUS_ADDED;
4025 else if (!DIFF_FILE_VALID(p->two))
4026 p->status = DIFF_STATUS_DELETED;
4027 else if (DIFF_PAIR_TYPE_CHANGED(p))
4028 p->status = DIFF_STATUS_TYPE_CHANGED;
4029
4030 /* from this point on, we are dealing with a pair
4031 * whose both sides are valid and of the same type, i.e.
4032 * either in-place edit or rename/copy edit.
4033 */
4034 else if (DIFF_PAIR_RENAME(p)) {
4035 /*
4036 * A rename might have re-connected a broken
4037 * pair up, causing the pathnames to be the
4038 * same again. If so, that's not a rename at
4039 * all, just a modification..
4040 *
4041 * Otherwise, see if this source was used for
4042 * multiple renames, in which case we decrement
4043 * the count, and call it a copy.
4044 */
4045 if (!strcmp(p->one->path, p->two->path))
4046 p->status = DIFF_STATUS_MODIFIED;
4047 else if (--p->one->rename_used > 0)
4048 p->status = DIFF_STATUS_COPIED;
4049 else
4050 p->status = DIFF_STATUS_RENAMED;
4051 }
4052 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4053 p->one->mode != p->two->mode ||
4054 p->one->dirty_submodule ||
4055 p->two->dirty_submodule ||
4056 is_null_sha1(p->one->sha1))
4057 p->status = DIFF_STATUS_MODIFIED;
4058 else {
4059 /* This is a "no-change" entry and should not
4060 * happen anymore, but prepare for broken callers.
4061 */
4062 error("feeding unmodified %s to diffcore",
4063 p->one->path);
4064 p->status = DIFF_STATUS_UNKNOWN;
4065 }
4066 }
4067 diff_debug_queue("resolve-rename-copy done", q);
4068 }
4069
4070 static int check_pair_status(struct diff_filepair *p)
4071 {
4072 switch (p->status) {
4073 case DIFF_STATUS_UNKNOWN:
4074 return 0;
4075 case 0:
4076 die("internal error in diff-resolve-rename-copy");
4077 default:
4078 return 1;
4079 }
4080 }
4081
4082 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4083 {
4084 int fmt = opt->output_format;
4085
4086 if (fmt & DIFF_FORMAT_CHECKDIFF)
4087 diff_flush_checkdiff(p, opt);
4088 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4089 diff_flush_raw(p, opt);
4090 else if (fmt & DIFF_FORMAT_NAME) {
4091 const char *name_a, *name_b;
4092 name_a = p->two->path;
4093 name_b = NULL;
4094 strip_prefix(opt->prefix_length, &name_a, &name_b);
4095 write_name_quoted(name_a, opt->file, opt->line_termination);
4096 }
4097 }
4098
4099 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4100 {
4101 if (fs->mode)
4102 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4103 else
4104 fprintf(file, " %s ", newdelete);
4105 write_name_quoted(fs->path, file, '\n');
4106 }
4107
4108
4109 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4110 const char *line_prefix)
4111 {
4112 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4113 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4114 p->two->mode, show_name ? ' ' : '\n');
4115 if (show_name) {
4116 write_name_quoted(p->two->path, file, '\n');
4117 }
4118 }
4119 }
4120
4121 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4122 const char *line_prefix)
4123 {
4124 char *names = pprint_rename(p->one->path, p->two->path);
4125
4126 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4127 free(names);
4128 show_mode_change(file, p, 0, line_prefix);
4129 }
4130
4131 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4132 {
4133 FILE *file = opt->file;
4134 char *line_prefix = "";
4135
4136 if (opt->output_prefix) {
4137 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4138 line_prefix = buf->buf;
4139 }
4140
4141 switch(p->status) {
4142 case DIFF_STATUS_DELETED:
4143 fputs(line_prefix, file);
4144 show_file_mode_name(file, "delete", p->one);
4145 break;
4146 case DIFF_STATUS_ADDED:
4147 fputs(line_prefix, file);
4148 show_file_mode_name(file, "create", p->two);
4149 break;
4150 case DIFF_STATUS_COPIED:
4151 fputs(line_prefix, file);
4152 show_rename_copy(file, "copy", p, line_prefix);
4153 break;
4154 case DIFF_STATUS_RENAMED:
4155 fputs(line_prefix, file);
4156 show_rename_copy(file, "rename", p, line_prefix);
4157 break;
4158 default:
4159 if (p->score) {
4160 fprintf(file, "%s rewrite ", line_prefix);
4161 write_name_quoted(p->two->path, file, ' ');
4162 fprintf(file, "(%d%%)\n", similarity_index(p));
4163 }
4164 show_mode_change(file, p, !p->score, line_prefix);
4165 break;
4166 }
4167 }
4168
4169 struct patch_id_t {
4170 git_SHA_CTX *ctx;
4171 int patchlen;
4172 };
4173
4174 static int remove_space(char *line, int len)
4175 {
4176 int i;
4177 char *dst = line;
4178 unsigned char c;
4179
4180 for (i = 0; i < len; i++)
4181 if (!isspace((c = line[i])))
4182 *dst++ = c;
4183
4184 return dst - line;
4185 }
4186
4187 static void patch_id_consume(void *priv, char *line, unsigned long len)
4188 {
4189 struct patch_id_t *data = priv;
4190 int new_len;
4191
4192 /* Ignore line numbers when computing the SHA1 of the patch */
4193 if (!prefixcmp(line, "@@ -"))
4194 return;
4195
4196 new_len = remove_space(line, len);
4197
4198 git_SHA1_Update(data->ctx, line, new_len);
4199 data->patchlen += new_len;
4200 }
4201
4202 /* returns 0 upon success, and writes result into sha1 */
4203 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4204 {
4205 struct diff_queue_struct *q = &diff_queued_diff;
4206 int i;
4207 git_SHA_CTX ctx;
4208 struct patch_id_t data;
4209 char buffer[PATH_MAX * 4 + 20];
4210
4211 git_SHA1_Init(&ctx);
4212 memset(&data, 0, sizeof(struct patch_id_t));
4213 data.ctx = &ctx;
4214
4215 for (i = 0; i < q->nr; i++) {
4216 xpparam_t xpp;
4217 xdemitconf_t xecfg;
4218 mmfile_t mf1, mf2;
4219 struct diff_filepair *p = q->queue[i];
4220 int len1, len2;
4221
4222 memset(&xpp, 0, sizeof(xpp));
4223 memset(&xecfg, 0, sizeof(xecfg));
4224 if (p->status == 0)
4225 return error("internal diff status error");
4226 if (p->status == DIFF_STATUS_UNKNOWN)
4227 continue;
4228 if (diff_unmodified_pair(p))
4229 continue;
4230 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4231 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4232 continue;
4233 if (DIFF_PAIR_UNMERGED(p))
4234 continue;
4235
4236 diff_fill_sha1_info(p->one);
4237 diff_fill_sha1_info(p->two);
4238 if (fill_mmfile(&mf1, p->one) < 0 ||
4239 fill_mmfile(&mf2, p->two) < 0)
4240 return error("unable to read files to diff");
4241
4242 len1 = remove_space(p->one->path, strlen(p->one->path));
4243 len2 = remove_space(p->two->path, strlen(p->two->path));
4244 if (p->one->mode == 0)
4245 len1 = snprintf(buffer, sizeof(buffer),
4246 "diff--gita/%.*sb/%.*s"
4247 "newfilemode%06o"
4248 "---/dev/null"
4249 "+++b/%.*s",
4250 len1, p->one->path,
4251 len2, p->two->path,
4252 p->two->mode,
4253 len2, p->two->path);
4254 else if (p->two->mode == 0)
4255 len1 = snprintf(buffer, sizeof(buffer),
4256 "diff--gita/%.*sb/%.*s"
4257 "deletedfilemode%06o"
4258 "---a/%.*s"
4259 "+++/dev/null",
4260 len1, p->one->path,
4261 len2, p->two->path,
4262 p->one->mode,
4263 len1, p->one->path);
4264 else
4265 len1 = snprintf(buffer, sizeof(buffer),
4266 "diff--gita/%.*sb/%.*s"
4267 "---a/%.*s"
4268 "+++b/%.*s",
4269 len1, p->one->path,
4270 len2, p->two->path,
4271 len1, p->one->path,
4272 len2, p->two->path);
4273 git_SHA1_Update(&ctx, buffer, len1);
4274
4275 if (diff_filespec_is_binary(p->one) ||
4276 diff_filespec_is_binary(p->two)) {
4277 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4278 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4279 continue;
4280 }
4281
4282 xpp.flags = 0;
4283 xecfg.ctxlen = 3;
4284 xecfg.flags = 0;
4285 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4286 &xpp, &xecfg);
4287 }
4288
4289 git_SHA1_Final(sha1, &ctx);
4290 return 0;
4291 }
4292
4293 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4294 {
4295 struct diff_queue_struct *q = &diff_queued_diff;
4296 int i;
4297 int result = diff_get_patch_id(options, sha1);
4298
4299 for (i = 0; i < q->nr; i++)
4300 diff_free_filepair(q->queue[i]);
4301
4302 free(q->queue);
4303 DIFF_QUEUE_CLEAR(q);
4304
4305 return result;
4306 }
4307
4308 static int is_summary_empty(const struct diff_queue_struct *q)
4309 {
4310 int i;
4311
4312 for (i = 0; i < q->nr; i++) {
4313 const struct diff_filepair *p = q->queue[i];
4314
4315 switch (p->status) {
4316 case DIFF_STATUS_DELETED:
4317 case DIFF_STATUS_ADDED:
4318 case DIFF_STATUS_COPIED:
4319 case DIFF_STATUS_RENAMED:
4320 return 0;
4321 default:
4322 if (p->score)
4323 return 0;
4324 if (p->one->mode && p->two->mode &&
4325 p->one->mode != p->two->mode)
4326 return 0;
4327 break;
4328 }
4329 }
4330 return 1;
4331 }
4332
4333 static const char rename_limit_warning[] =
4334 "inexact rename detection was skipped due to too many files.";
4335
4336 static const char degrade_cc_to_c_warning[] =
4337 "only found copies from modified paths due to too many files.";
4338
4339 static const char rename_limit_advice[] =
4340 "you may want to set your %s variable to at least "
4341 "%d and retry the command.";
4342
4343 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4344 {
4345 if (degraded_cc)
4346 warning(degrade_cc_to_c_warning);
4347 else if (needed)
4348 warning(rename_limit_warning);
4349 else
4350 return;
4351 if (0 < needed && needed < 32767)
4352 warning(rename_limit_advice, varname, needed);
4353 }
4354
4355 void diff_flush(struct diff_options *options)
4356 {
4357 struct diff_queue_struct *q = &diff_queued_diff;
4358 int i, output_format = options->output_format;
4359 int separator = 0;
4360 int dirstat_by_line = 0;
4361
4362 /*
4363 * Order: raw, stat, summary, patch
4364 * or: name/name-status/checkdiff (other bits clear)
4365 */
4366 if (!q->nr)
4367 goto free_queue;
4368
4369 if (output_format & (DIFF_FORMAT_RAW |
4370 DIFF_FORMAT_NAME |
4371 DIFF_FORMAT_NAME_STATUS |
4372 DIFF_FORMAT_CHECKDIFF)) {
4373 for (i = 0; i < q->nr; i++) {
4374 struct diff_filepair *p = q->queue[i];
4375 if (check_pair_status(p))
4376 flush_one_pair(p, options);
4377 }
4378 separator++;
4379 }
4380
4381 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4382 dirstat_by_line = 1;
4383
4384 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4385 dirstat_by_line) {
4386 struct diffstat_t diffstat;
4387
4388 memset(&diffstat, 0, sizeof(struct diffstat_t));
4389 for (i = 0; i < q->nr; i++) {
4390 struct diff_filepair *p = q->queue[i];
4391 if (check_pair_status(p))
4392 diff_flush_stat(p, options, &diffstat);
4393 }
4394 if (output_format & DIFF_FORMAT_NUMSTAT)
4395 show_numstat(&diffstat, options);
4396 if (output_format & DIFF_FORMAT_DIFFSTAT)
4397 show_stats(&diffstat, options);
4398 if (output_format & DIFF_FORMAT_SHORTSTAT)
4399 show_shortstats(&diffstat, options);
4400 if (output_format & DIFF_FORMAT_DIRSTAT)
4401 show_dirstat_by_line(&diffstat, options);
4402 free_diffstat_info(&diffstat);
4403 separator++;
4404 }
4405 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4406 show_dirstat(options);
4407
4408 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4409 for (i = 0; i < q->nr; i++) {
4410 diff_summary(options, q->queue[i]);
4411 }
4412 separator++;
4413 }
4414
4415 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4416 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4417 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4418 /*
4419 * run diff_flush_patch for the exit status. setting
4420 * options->file to /dev/null should be safe, becaue we
4421 * aren't supposed to produce any output anyway.
4422 */
4423 if (options->close_file)
4424 fclose(options->file);
4425 options->file = fopen("/dev/null", "w");
4426 if (!options->file)
4427 die_errno("Could not open /dev/null");
4428 options->close_file = 1;
4429 for (i = 0; i < q->nr; i++) {
4430 struct diff_filepair *p = q->queue[i];
4431 if (check_pair_status(p))
4432 diff_flush_patch(p, options);
4433 if (options->found_changes)
4434 break;
4435 }
4436 }
4437
4438 if (output_format & DIFF_FORMAT_PATCH) {
4439 if (separator) {
4440 if (options->output_prefix) {
4441 struct strbuf *msg = NULL;
4442 msg = options->output_prefix(options,
4443 options->output_prefix_data);
4444 fwrite(msg->buf, msg->len, 1, stdout);
4445 }
4446 putc(options->line_termination, options->file);
4447 if (options->stat_sep) {
4448 /* attach patch instead of inline */
4449 fputs(options->stat_sep, options->file);
4450 }
4451 }
4452
4453 for (i = 0; i < q->nr; i++) {
4454 struct diff_filepair *p = q->queue[i];
4455 if (check_pair_status(p))
4456 diff_flush_patch(p, options);
4457 }
4458 }
4459
4460 if (output_format & DIFF_FORMAT_CALLBACK)
4461 options->format_callback(q, options, options->format_callback_data);
4462
4463 for (i = 0; i < q->nr; i++)
4464 diff_free_filepair(q->queue[i]);
4465 free_queue:
4466 free(q->queue);
4467 DIFF_QUEUE_CLEAR(q);
4468 if (options->close_file)
4469 fclose(options->file);
4470
4471 /*
4472 * Report the content-level differences with HAS_CHANGES;
4473 * diff_addremove/diff_change does not set the bit when
4474 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4475 */
4476 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4477 if (options->found_changes)
4478 DIFF_OPT_SET(options, HAS_CHANGES);
4479 else
4480 DIFF_OPT_CLR(options, HAS_CHANGES);
4481 }
4482 }
4483
4484 static void diffcore_apply_filter(const char *filter)
4485 {
4486 int i;
4487 struct diff_queue_struct *q = &diff_queued_diff;
4488 struct diff_queue_struct outq;
4489 DIFF_QUEUE_CLEAR(&outq);
4490
4491 if (!filter)
4492 return;
4493
4494 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4495 int found;
4496 for (i = found = 0; !found && i < q->nr; i++) {
4497 struct diff_filepair *p = q->queue[i];
4498 if (((p->status == DIFF_STATUS_MODIFIED) &&
4499 ((p->score &&
4500 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4501 (!p->score &&
4502 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4503 ((p->status != DIFF_STATUS_MODIFIED) &&
4504 strchr(filter, p->status)))
4505 found++;
4506 }
4507 if (found)
4508 return;
4509
4510 /* otherwise we will clear the whole queue
4511 * by copying the empty outq at the end of this
4512 * function, but first clear the current entries
4513 * in the queue.
4514 */
4515 for (i = 0; i < q->nr; i++)
4516 diff_free_filepair(q->queue[i]);
4517 }
4518 else {
4519 /* Only the matching ones */
4520 for (i = 0; i < q->nr; i++) {
4521 struct diff_filepair *p = q->queue[i];
4522
4523 if (((p->status == DIFF_STATUS_MODIFIED) &&
4524 ((p->score &&
4525 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4526 (!p->score &&
4527 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4528 ((p->status != DIFF_STATUS_MODIFIED) &&
4529 strchr(filter, p->status)))
4530 diff_q(&outq, p);
4531 else
4532 diff_free_filepair(p);
4533 }
4534 }
4535 free(q->queue);
4536 *q = outq;
4537 }
4538
4539 /* Check whether two filespecs with the same mode and size are identical */
4540 static int diff_filespec_is_identical(struct diff_filespec *one,
4541 struct diff_filespec *two)
4542 {
4543 if (S_ISGITLINK(one->mode))
4544 return 0;
4545 if (diff_populate_filespec(one, 0))
4546 return 0;
4547 if (diff_populate_filespec(two, 0))
4548 return 0;
4549 return !memcmp(one->data, two->data, one->size);
4550 }
4551
4552 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4553 {
4554 int i;
4555 struct diff_queue_struct *q = &diff_queued_diff;
4556 struct diff_queue_struct outq;
4557 DIFF_QUEUE_CLEAR(&outq);
4558
4559 for (i = 0; i < q->nr; i++) {
4560 struct diff_filepair *p = q->queue[i];
4561
4562 /*
4563 * 1. Entries that come from stat info dirtiness
4564 * always have both sides (iow, not create/delete),
4565 * one side of the object name is unknown, with
4566 * the same mode and size. Keep the ones that
4567 * do not match these criteria. They have real
4568 * differences.
4569 *
4570 * 2. At this point, the file is known to be modified,
4571 * with the same mode and size, and the object
4572 * name of one side is unknown. Need to inspect
4573 * the identical contents.
4574 */
4575 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4576 !DIFF_FILE_VALID(p->two) ||
4577 (p->one->sha1_valid && p->two->sha1_valid) ||
4578 (p->one->mode != p->two->mode) ||
4579 diff_populate_filespec(p->one, 1) ||
4580 diff_populate_filespec(p->two, 1) ||
4581 (p->one->size != p->two->size) ||
4582 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4583 diff_q(&outq, p);
4584 else {
4585 /*
4586 * The caller can subtract 1 from skip_stat_unmatch
4587 * to determine how many paths were dirty only
4588 * due to stat info mismatch.
4589 */
4590 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4591 diffopt->skip_stat_unmatch++;
4592 diff_free_filepair(p);
4593 }
4594 }
4595 free(q->queue);
4596 *q = outq;
4597 }
4598
4599 static int diffnamecmp(const void *a_, const void *b_)
4600 {
4601 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4602 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4603 const char *name_a, *name_b;
4604
4605 name_a = a->one ? a->one->path : a->two->path;
4606 name_b = b->one ? b->one->path : b->two->path;
4607 return strcmp(name_a, name_b);
4608 }
4609
4610 void diffcore_fix_diff_index(struct diff_options *options)
4611 {
4612 struct diff_queue_struct *q = &diff_queued_diff;
4613 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4614 }
4615
4616 void diffcore_std(struct diff_options *options)
4617 {
4618 if (options->skip_stat_unmatch)
4619 diffcore_skip_stat_unmatch(options);
4620 if (!options->found_follow) {
4621 /* See try_to_follow_renames() in tree-diff.c */
4622 if (options->break_opt != -1)
4623 diffcore_break(options->break_opt);
4624 if (options->detect_rename)
4625 diffcore_rename(options);
4626 if (options->break_opt != -1)
4627 diffcore_merge_broken();
4628 }
4629 if (options->pickaxe)
4630 diffcore_pickaxe(options);
4631 if (options->orderfile)
4632 diffcore_order(options->orderfile);
4633 if (!options->found_follow)
4634 /* See try_to_follow_renames() in tree-diff.c */
4635 diff_resolve_rename_copy();
4636 diffcore_apply_filter(options->filter);
4637
4638 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4639 DIFF_OPT_SET(options, HAS_CHANGES);
4640 else
4641 DIFF_OPT_CLR(options, HAS_CHANGES);
4642
4643 options->found_follow = 0;
4644 }
4645
4646 int diff_result_code(struct diff_options *opt, int status)
4647 {
4648 int result = 0;
4649
4650 diff_warn_rename_limit("diff.renamelimit",
4651 opt->needed_rename_limit,
4652 opt->degraded_cc_to_c);
4653 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4654 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4655 return status;
4656 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4657 DIFF_OPT_TST(opt, HAS_CHANGES))
4658 result |= 01;
4659 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4660 DIFF_OPT_TST(opt, CHECK_FAILED))
4661 result |= 02;
4662 return result;
4663 }
4664
4665 int diff_can_quit_early(struct diff_options *opt)
4666 {
4667 return (DIFF_OPT_TST(opt, QUICK) &&
4668 !opt->filter &&
4669 DIFF_OPT_TST(opt, HAS_CHANGES));
4670 }
4671
4672 /*
4673 * Shall changes to this submodule be ignored?
4674 *
4675 * Submodule changes can be configured to be ignored separately for each path,
4676 * but that configuration can be overridden from the command line.
4677 */
4678 static int is_submodule_ignored(const char *path, struct diff_options *options)
4679 {
4680 int ignored = 0;
4681 unsigned orig_flags = options->flags;
4682 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4683 set_diffopt_flags_from_submodule_config(options, path);
4684 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4685 ignored = 1;
4686 options->flags = orig_flags;
4687 return ignored;
4688 }
4689
4690 void diff_addremove(struct diff_options *options,
4691 int addremove, unsigned mode,
4692 const unsigned char *sha1,
4693 int sha1_valid,
4694 const char *concatpath, unsigned dirty_submodule)
4695 {
4696 struct diff_filespec *one, *two;
4697
4698 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4699 return;
4700
4701 /* This may look odd, but it is a preparation for
4702 * feeding "there are unchanged files which should
4703 * not produce diffs, but when you are doing copy
4704 * detection you would need them, so here they are"
4705 * entries to the diff-core. They will be prefixed
4706 * with something like '=' or '*' (I haven't decided
4707 * which but should not make any difference).
4708 * Feeding the same new and old to diff_change()
4709 * also has the same effect.
4710 * Before the final output happens, they are pruned after
4711 * merged into rename/copy pairs as appropriate.
4712 */
4713 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4714 addremove = (addremove == '+' ? '-' :
4715 addremove == '-' ? '+' : addremove);
4716
4717 if (options->prefix &&
4718 strncmp(concatpath, options->prefix, options->prefix_length))
4719 return;
4720
4721 one = alloc_filespec(concatpath);
4722 two = alloc_filespec(concatpath);
4723
4724 if (addremove != '+')
4725 fill_filespec(one, sha1, sha1_valid, mode);
4726 if (addremove != '-') {
4727 fill_filespec(two, sha1, sha1_valid, mode);
4728 two->dirty_submodule = dirty_submodule;
4729 }
4730
4731 diff_queue(&diff_queued_diff, one, two);
4732 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4733 DIFF_OPT_SET(options, HAS_CHANGES);
4734 }
4735
4736 void diff_change(struct diff_options *options,
4737 unsigned old_mode, unsigned new_mode,
4738 const unsigned char *old_sha1,
4739 const unsigned char *new_sha1,
4740 int old_sha1_valid, int new_sha1_valid,
4741 const char *concatpath,
4742 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4743 {
4744 struct diff_filespec *one, *two;
4745
4746 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4747 is_submodule_ignored(concatpath, options))
4748 return;
4749
4750 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4751 unsigned tmp;
4752 const unsigned char *tmp_c;
4753 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4754 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4755 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4756 new_sha1_valid = tmp;
4757 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4758 new_dirty_submodule = tmp;
4759 }
4760
4761 if (options->prefix &&
4762 strncmp(concatpath, options->prefix, options->prefix_length))
4763 return;
4764
4765 one = alloc_filespec(concatpath);
4766 two = alloc_filespec(concatpath);
4767 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4768 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4769 one->dirty_submodule = old_dirty_submodule;
4770 two->dirty_submodule = new_dirty_submodule;
4771
4772 diff_queue(&diff_queued_diff, one, two);
4773 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4774 DIFF_OPT_SET(options, HAS_CHANGES);
4775 }
4776
4777 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4778 {
4779 struct diff_filepair *pair;
4780 struct diff_filespec *one, *two;
4781
4782 if (options->prefix &&
4783 strncmp(path, options->prefix, options->prefix_length))
4784 return NULL;
4785
4786 one = alloc_filespec(path);
4787 two = alloc_filespec(path);
4788 pair = diff_queue(&diff_queued_diff, one, two);
4789 pair->is_unmerged = 1;
4790 return pair;
4791 }
4792
4793 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4794 size_t *outsize)
4795 {
4796 struct diff_tempfile *temp;
4797 const char *argv[3];
4798 const char **arg = argv;
4799 struct child_process child;
4800 struct strbuf buf = STRBUF_INIT;
4801 int err = 0;
4802
4803 temp = prepare_temp_file(spec->path, spec);
4804 *arg++ = pgm;
4805 *arg++ = temp->name;
4806 *arg = NULL;
4807
4808 memset(&child, 0, sizeof(child));
4809 child.use_shell = 1;
4810 child.argv = argv;
4811 child.out = -1;
4812 if (start_command(&child)) {
4813 remove_tempfile();
4814 return NULL;
4815 }
4816
4817 if (strbuf_read(&buf, child.out, 0) < 0)
4818 err = error("error reading from textconv command '%s'", pgm);
4819 close(child.out);
4820
4821 if (finish_command(&child) || err) {
4822 strbuf_release(&buf);
4823 remove_tempfile();
4824 return NULL;
4825 }
4826 remove_tempfile();
4827
4828 return strbuf_detach(&buf, outsize);
4829 }
4830
4831 size_t fill_textconv(struct userdiff_driver *driver,
4832 struct diff_filespec *df,
4833 char **outbuf)
4834 {
4835 size_t size;
4836
4837 if (!driver || !driver->textconv) {
4838 if (!DIFF_FILE_VALID(df)) {
4839 *outbuf = "";
4840 return 0;
4841 }
4842 if (diff_populate_filespec(df, 0))
4843 die("unable to read files to diff");
4844 *outbuf = df->data;
4845 return df->size;
4846 }
4847
4848 if (driver->textconv_cache && df->sha1_valid) {
4849 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4850 &size);
4851 if (*outbuf)
4852 return size;
4853 }
4854
4855 *outbuf = run_textconv(driver->textconv, df, &size);
4856 if (!*outbuf)
4857 die("unable to read files to diff");
4858
4859 if (driver->textconv_cache && df->sha1_valid) {
4860 /* ignore errors, as we might be in a readonly repository */
4861 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4862 size);
4863 /*
4864 * we could save up changes and flush them all at the end,
4865 * but we would need an extra call after all diffing is done.
4866 * Since generating a cache entry is the slow path anyway,
4867 * this extra overhead probably isn't a big deal.
4868 */
4869 notes_cache_write(driver->textconv_cache);
4870 }
4871
4872 return size;
4873 }
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