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git-remote-hg: add the helper
[git/dscho.git] / diff.c
blob77edd5086fff30af36e92a151377c285de21aca3
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18
19 #ifdef NO_FAST_WORKING_DIRECTORY
20 #define FAST_WORKING_DIRECTORY 0
21 #else
22 #define FAST_WORKING_DIRECTORY 1
23 #endif
24
25 static int diff_detect_rename_default;
26 static int diff_rename_limit_default = 400;
27 static int diff_suppress_blank_empty;
28 int diff_use_color_default = -1;
29 static const char *diff_word_regex_cfg;
30 static const char *external_diff_cmd_cfg;
31 int diff_auto_refresh_index = 1;
32 static int diff_mnemonic_prefix;
33 static int diff_no_prefix;
34 static int diff_stat_graph_width;
35 static int diff_dirstat_permille_default = 30;
36 static struct diff_options default_diff_options;
37
38 static char diff_colors[][COLOR_MAXLEN] = {
39 GIT_COLOR_RESET,
40 GIT_COLOR_NORMAL, /* PLAIN */
41 GIT_COLOR_BOLD, /* METAINFO */
42 GIT_COLOR_CYAN, /* FRAGINFO */
43 GIT_COLOR_RED, /* OLD */
44 GIT_COLOR_GREEN, /* NEW */
45 GIT_COLOR_YELLOW, /* COMMIT */
46 GIT_COLOR_BG_RED, /* WHITESPACE */
47 GIT_COLOR_NORMAL, /* FUNCINFO */
48 };
49
50 static int parse_diff_color_slot(const char *var, int ofs)
51 {
52 if (!strcasecmp(var+ofs, "plain"))
53 return DIFF_PLAIN;
54 if (!strcasecmp(var+ofs, "meta"))
55 return DIFF_METAINFO;
56 if (!strcasecmp(var+ofs, "frag"))
57 return DIFF_FRAGINFO;
58 if (!strcasecmp(var+ofs, "old"))
59 return DIFF_FILE_OLD;
60 if (!strcasecmp(var+ofs, "new"))
61 return DIFF_FILE_NEW;
62 if (!strcasecmp(var+ofs, "commit"))
63 return DIFF_COMMIT;
64 if (!strcasecmp(var+ofs, "whitespace"))
65 return DIFF_WHITESPACE;
66 if (!strcasecmp(var+ofs, "func"))
67 return DIFF_FUNCINFO;
68 return -1;
69 }
70
71 static int parse_dirstat_params(struct diff_options *options, const char *params,
72 struct strbuf *errmsg)
73 {
74 const char *p = params;
75 int p_len, ret = 0;
76
77 while (*p) {
78 p_len = strchrnul(p, ',') - p;
79 if (!memcmp(p, "changes", p_len)) {
80 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
81 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
82 } else if (!memcmp(p, "lines", p_len)) {
83 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
84 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
85 } else if (!memcmp(p, "files", p_len)) {
86 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
87 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
88 } else if (!memcmp(p, "noncumulative", p_len)) {
89 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
90 } else if (!memcmp(p, "cumulative", p_len)) {
91 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
92 } else if (isdigit(*p)) {
93 char *end;
94 int permille = strtoul(p, &end, 10) * 10;
95 if (*end == '.' && isdigit(*++end)) {
96 /* only use first digit */
97 permille += *end - '0';
98 /* .. and ignore any further digits */
99 while (isdigit(*++end))
100 ; /* nothing */
101 }
102 if (end - p == p_len)
103 options->dirstat_permille = permille;
104 else {
105 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%.*s'\n"),
106 p_len, p);
107 ret++;
108 }
109 } else {
110 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%.*s'\n"),
111 p_len, p);
112 ret++;
113 }
114
115 p += p_len;
116
117 if (*p)
118 p++; /* more parameters, swallow separator */
119 }
120 return ret;
121 }
122
123 static int git_config_rename(const char *var, const char *value)
124 {
125 if (!value)
126 return DIFF_DETECT_RENAME;
127 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
128 return DIFF_DETECT_COPY;
129 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
130 }
131
132 /*
133 * These are to give UI layer defaults.
134 * The core-level commands such as git-diff-files should
135 * never be affected by the setting of diff.renames
136 * the user happens to have in the configuration file.
137 */
138 int git_diff_ui_config(const char *var, const char *value, void *cb)
139 {
140 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
141 diff_use_color_default = git_config_colorbool(var, value);
142 return 0;
143 }
144 if (!strcmp(var, "diff.renames")) {
145 diff_detect_rename_default = git_config_rename(var, value);
146 return 0;
147 }
148 if (!strcmp(var, "diff.autorefreshindex")) {
149 diff_auto_refresh_index = git_config_bool(var, value);
150 return 0;
151 }
152 if (!strcmp(var, "diff.mnemonicprefix")) {
153 diff_mnemonic_prefix = git_config_bool(var, value);
154 return 0;
155 }
156 if (!strcmp(var, "diff.noprefix")) {
157 diff_no_prefix = git_config_bool(var, value);
158 return 0;
159 }
160 if (!strcmp(var, "diff.statgraphwidth")) {
161 diff_stat_graph_width = git_config_int(var, value);
162 return 0;
163 }
164 if (!strcmp(var, "diff.external"))
165 return git_config_string(&external_diff_cmd_cfg, var, value);
166 if (!strcmp(var, "diff.wordregex"))
167 return git_config_string(&diff_word_regex_cfg, var, value);
168
169 if (!strcmp(var, "diff.ignoresubmodules"))
170 handle_ignore_submodules_arg(&default_diff_options, value);
171
172 if (git_color_config(var, value, cb) < 0)
173 return -1;
174
175 return git_diff_basic_config(var, value, cb);
176 }
177
178 int git_diff_basic_config(const char *var, const char *value, void *cb)
179 {
180 if (!strcmp(var, "diff.renamelimit")) {
181 diff_rename_limit_default = git_config_int(var, value);
182 return 0;
183 }
184
185 if (userdiff_config(var, value) < 0)
186 return -1;
187
188 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
189 int slot = parse_diff_color_slot(var, 11);
190 if (slot < 0)
191 return 0;
192 if (!value)
193 return config_error_nonbool(var);
194 color_parse(value, var, diff_colors[slot]);
195 return 0;
196 }
197
198 /* like GNU diff's --suppress-blank-empty option */
199 if (!strcmp(var, "diff.suppressblankempty") ||
200 /* for backwards compatibility */
201 !strcmp(var, "diff.suppress-blank-empty")) {
202 diff_suppress_blank_empty = git_config_bool(var, value);
203 return 0;
204 }
205
206 if (!strcmp(var, "diff.dirstat")) {
207 struct strbuf errmsg = STRBUF_INIT;
208 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
209 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
210 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
211 errmsg.buf);
212 strbuf_release(&errmsg);
213 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
214 return 0;
215 }
216
217 if (!prefixcmp(var, "submodule."))
218 return parse_submodule_config_option(var, value);
219
220 return git_default_config(var, value, cb);
221 }
222
223 static char *quote_two(const char *one, const char *two)
224 {
225 int need_one = quote_c_style(one, NULL, NULL, 1);
226 int need_two = quote_c_style(two, NULL, NULL, 1);
227 struct strbuf res = STRBUF_INIT;
228
229 if (need_one + need_two) {
230 strbuf_addch(&res, '"');
231 quote_c_style(one, &res, NULL, 1);
232 quote_c_style(two, &res, NULL, 1);
233 strbuf_addch(&res, '"');
234 } else {
235 strbuf_addstr(&res, one);
236 strbuf_addstr(&res, two);
237 }
238 return strbuf_detach(&res, NULL);
239 }
240
241 static const char *external_diff(void)
242 {
243 static const char *external_diff_cmd = NULL;
244 static int done_preparing = 0;
245
246 if (done_preparing)
247 return external_diff_cmd;
248 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
249 if (!external_diff_cmd)
250 external_diff_cmd = external_diff_cmd_cfg;
251 done_preparing = 1;
252 return external_diff_cmd;
253 }
254
255 static struct diff_tempfile {
256 const char *name; /* filename external diff should read from */
257 char hex[41];
258 char mode[10];
259 char tmp_path[PATH_MAX];
260 } diff_temp[2];
261
262 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
263
264 struct emit_callback {
265 int color_diff;
266 unsigned ws_rule;
267 int blank_at_eof_in_preimage;
268 int blank_at_eof_in_postimage;
269 int lno_in_preimage;
270 int lno_in_postimage;
271 sane_truncate_fn truncate;
272 const char **label_path;
273 struct diff_words_data *diff_words;
274 struct diff_options *opt;
275 int *found_changesp;
276 struct strbuf *header;
277 };
278
279 static int count_lines(const char *data, int size)
280 {
281 int count, ch, completely_empty = 1, nl_just_seen = 0;
282 count = 0;
283 while (0 < size--) {
284 ch = *data++;
285 if (ch == '\n') {
286 count++;
287 nl_just_seen = 1;
288 completely_empty = 0;
289 }
290 else {
291 nl_just_seen = 0;
292 completely_empty = 0;
293 }
294 }
295 if (completely_empty)
296 return 0;
297 if (!nl_just_seen)
298 count++; /* no trailing newline */
299 return count;
300 }
301
302 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
303 {
304 if (!DIFF_FILE_VALID(one)) {
305 mf->ptr = (char *)""; /* does not matter */
306 mf->size = 0;
307 return 0;
308 }
309 else if (diff_populate_filespec(one, 0))
310 return -1;
311
312 mf->ptr = one->data;
313 mf->size = one->size;
314 return 0;
315 }
316
317 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
318 static unsigned long diff_filespec_size(struct diff_filespec *one)
319 {
320 if (!DIFF_FILE_VALID(one))
321 return 0;
322 diff_populate_filespec(one, 1);
323 return one->size;
324 }
325
326 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
327 {
328 char *ptr = mf->ptr;
329 long size = mf->size;
330 int cnt = 0;
331
332 if (!size)
333 return cnt;
334 ptr += size - 1; /* pointing at the very end */
335 if (*ptr != '\n')
336 ; /* incomplete line */
337 else
338 ptr--; /* skip the last LF */
339 while (mf->ptr < ptr) {
340 char *prev_eol;
341 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
342 if (*prev_eol == '\n')
343 break;
344 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
345 break;
346 cnt++;
347 ptr = prev_eol - 1;
348 }
349 return cnt;
350 }
351
352 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
353 struct emit_callback *ecbdata)
354 {
355 int l1, l2, at;
356 unsigned ws_rule = ecbdata->ws_rule;
357 l1 = count_trailing_blank(mf1, ws_rule);
358 l2 = count_trailing_blank(mf2, ws_rule);
359 if (l2 <= l1) {
360 ecbdata->blank_at_eof_in_preimage = 0;
361 ecbdata->blank_at_eof_in_postimage = 0;
362 return;
363 }
364 at = count_lines(mf1->ptr, mf1->size);
365 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
366
367 at = count_lines(mf2->ptr, mf2->size);
368 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
369 }
370
371 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
372 int first, const char *line, int len)
373 {
374 int has_trailing_newline, has_trailing_carriage_return;
375 int nofirst;
376 FILE *file = o->file;
377
378 if (o->output_prefix) {
379 struct strbuf *msg = NULL;
380 msg = o->output_prefix(o, o->output_prefix_data);
381 assert(msg);
382 fwrite(msg->buf, msg->len, 1, file);
383 }
384
385 if (len == 0) {
386 has_trailing_newline = (first == '\n');
387 has_trailing_carriage_return = (!has_trailing_newline &&
388 (first == '\r'));
389 nofirst = has_trailing_newline || has_trailing_carriage_return;
390 } else {
391 has_trailing_newline = (len > 0 && line[len-1] == '\n');
392 if (has_trailing_newline)
393 len--;
394 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
395 if (has_trailing_carriage_return)
396 len--;
397 nofirst = 0;
398 }
399
400 if (len || !nofirst) {
401 fputs(set, file);
402 if (!nofirst)
403 fputc(first, file);
404 fwrite(line, len, 1, file);
405 fputs(reset, file);
406 }
407 if (has_trailing_carriage_return)
408 fputc('\r', file);
409 if (has_trailing_newline)
410 fputc('\n', file);
411 }
412
413 static void emit_line(struct diff_options *o, const char *set, const char *reset,
414 const char *line, int len)
415 {
416 emit_line_0(o, set, reset, line[0], line+1, len-1);
417 }
418
419 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
420 {
421 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
422 ecbdata->blank_at_eof_in_preimage &&
423 ecbdata->blank_at_eof_in_postimage &&
424 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
425 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
426 return 0;
427 return ws_blank_line(line, len, ecbdata->ws_rule);
428 }
429
430 static void emit_add_line(const char *reset,
431 struct emit_callback *ecbdata,
432 const char *line, int len)
433 {
434 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
435 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
436
437 if (!*ws)
438 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
439 else if (new_blank_line_at_eof(ecbdata, line, len))
440 /* Blank line at EOF - paint '+' as well */
441 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
442 else {
443 /* Emit just the prefix, then the rest. */
444 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
445 ws_check_emit(line, len, ecbdata->ws_rule,
446 ecbdata->opt->file, set, reset, ws);
447 }
448 }
449
450 static void emit_hunk_header(struct emit_callback *ecbdata,
451 const char *line, int len)
452 {
453 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
454 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
455 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
456 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
457 static const char atat[2] = { '@', '@' };
458 const char *cp, *ep;
459 struct strbuf msgbuf = STRBUF_INIT;
460 int org_len = len;
461 int i = 1;
462
463 /*
464 * As a hunk header must begin with "@@ -<old>, +<new> @@",
465 * it always is at least 10 bytes long.
466 */
467 if (len < 10 ||
468 memcmp(line, atat, 2) ||
469 !(ep = memmem(line + 2, len - 2, atat, 2))) {
470 emit_line(ecbdata->opt, plain, reset, line, len);
471 return;
472 }
473 ep += 2; /* skip over @@ */
474
475 /* The hunk header in fraginfo color */
476 strbuf_add(&msgbuf, frag, strlen(frag));
477 strbuf_add(&msgbuf, line, ep - line);
478 strbuf_add(&msgbuf, reset, strlen(reset));
479
480 /*
481 * trailing "\r\n"
482 */
483 for ( ; i < 3; i++)
484 if (line[len - i] == '\r' || line[len - i] == '\n')
485 len--;
486
487 /* blank before the func header */
488 for (cp = ep; ep - line < len; ep++)
489 if (*ep != ' ' && *ep != '\t')
490 break;
491 if (ep != cp) {
492 strbuf_add(&msgbuf, plain, strlen(plain));
493 strbuf_add(&msgbuf, cp, ep - cp);
494 strbuf_add(&msgbuf, reset, strlen(reset));
495 }
496
497 if (ep < line + len) {
498 strbuf_add(&msgbuf, func, strlen(func));
499 strbuf_add(&msgbuf, ep, line + len - ep);
500 strbuf_add(&msgbuf, reset, strlen(reset));
501 }
502
503 strbuf_add(&msgbuf, line + len, org_len - len);
504 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
505 strbuf_release(&msgbuf);
506 }
507
508 static struct diff_tempfile *claim_diff_tempfile(void) {
509 int i;
510 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
511 if (!diff_temp[i].name)
512 return diff_temp + i;
513 die("BUG: diff is failing to clean up its tempfiles");
514 }
515
516 static int remove_tempfile_installed;
517
518 static void remove_tempfile(void)
519 {
520 int i;
521 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
522 if (diff_temp[i].name == diff_temp[i].tmp_path)
523 unlink_or_warn(diff_temp[i].name);
524 diff_temp[i].name = NULL;
525 }
526 }
527
528 static void remove_tempfile_on_signal(int signo)
529 {
530 remove_tempfile();
531 sigchain_pop(signo);
532 raise(signo);
533 }
534
535 static void print_line_count(FILE *file, int count)
536 {
537 switch (count) {
538 case 0:
539 fprintf(file, "0,0");
540 break;
541 case 1:
542 fprintf(file, "1");
543 break;
544 default:
545 fprintf(file, "1,%d", count);
546 break;
547 }
548 }
549
550 static void emit_rewrite_lines(struct emit_callback *ecb,
551 int prefix, const char *data, int size)
552 {
553 const char *endp = NULL;
554 static const char *nneof = " No newline at end of file\n";
555 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
556 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
557
558 while (0 < size) {
559 int len;
560
561 endp = memchr(data, '\n', size);
562 len = endp ? (endp - data + 1) : size;
563 if (prefix != '+') {
564 ecb->lno_in_preimage++;
565 emit_line_0(ecb->opt, old, reset, '-',
566 data, len);
567 } else {
568 ecb->lno_in_postimage++;
569 emit_add_line(reset, ecb, data, len);
570 }
571 size -= len;
572 data += len;
573 }
574 if (!endp) {
575 const char *plain = diff_get_color(ecb->color_diff,
576 DIFF_PLAIN);
577 emit_line_0(ecb->opt, plain, reset, '\\',
578 nneof, strlen(nneof));
579 }
580 }
581
582 static void emit_rewrite_diff(const char *name_a,
583 const char *name_b,
584 struct diff_filespec *one,
585 struct diff_filespec *two,
586 struct userdiff_driver *textconv_one,
587 struct userdiff_driver *textconv_two,
588 struct diff_options *o)
589 {
590 int lc_a, lc_b;
591 const char *name_a_tab, *name_b_tab;
592 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
593 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
594 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
595 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
596 const char *a_prefix, *b_prefix;
597 char *data_one, *data_two;
598 size_t size_one, size_two;
599 struct emit_callback ecbdata;
600 char *line_prefix = "";
601 struct strbuf *msgbuf;
602
603 if (o && o->output_prefix) {
604 msgbuf = o->output_prefix(o, o->output_prefix_data);
605 line_prefix = msgbuf->buf;
606 }
607
608 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
609 a_prefix = o->b_prefix;
610 b_prefix = o->a_prefix;
611 } else {
612 a_prefix = o->a_prefix;
613 b_prefix = o->b_prefix;
614 }
615
616 name_a += (*name_a == '/');
617 name_b += (*name_b == '/');
618 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
619 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
620
621 strbuf_reset(&a_name);
622 strbuf_reset(&b_name);
623 quote_two_c_style(&a_name, a_prefix, name_a, 0);
624 quote_two_c_style(&b_name, b_prefix, name_b, 0);
625
626 size_one = fill_textconv(textconv_one, one, &data_one);
627 size_two = fill_textconv(textconv_two, two, &data_two);
628
629 memset(&ecbdata, 0, sizeof(ecbdata));
630 ecbdata.color_diff = want_color(o->use_color);
631 ecbdata.found_changesp = &o->found_changes;
632 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
633 ecbdata.opt = o;
634 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
635 mmfile_t mf1, mf2;
636 mf1.ptr = (char *)data_one;
637 mf2.ptr = (char *)data_two;
638 mf1.size = size_one;
639 mf2.size = size_two;
640 check_blank_at_eof(&mf1, &mf2, &ecbdata);
641 }
642 ecbdata.lno_in_preimage = 1;
643 ecbdata.lno_in_postimage = 1;
644
645 lc_a = count_lines(data_one, size_one);
646 lc_b = count_lines(data_two, size_two);
647 fprintf(o->file,
648 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
649 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
650 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
651 line_prefix, fraginfo);
652 if (!o->irreversible_delete)
653 print_line_count(o->file, lc_a);
654 else
655 fprintf(o->file, "?,?");
656 fprintf(o->file, " +");
657 print_line_count(o->file, lc_b);
658 fprintf(o->file, " @@%s\n", reset);
659 if (lc_a && !o->irreversible_delete)
660 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
661 if (lc_b)
662 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
663 if (textconv_one)
664 free((char *)data_one);
665 if (textconv_two)
666 free((char *)data_two);
667 }
668
669 struct diff_words_buffer {
670 mmfile_t text;
671 long alloc;
672 struct diff_words_orig {
673 const char *begin, *end;
674 } *orig;
675 int orig_nr, orig_alloc;
676 };
677
678 static void diff_words_append(char *line, unsigned long len,
679 struct diff_words_buffer *buffer)
680 {
681 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
682 line++;
683 len--;
684 memcpy(buffer->text.ptr + buffer->text.size, line, len);
685 buffer->text.size += len;
686 buffer->text.ptr[buffer->text.size] = '\0';
687 }
688
689 struct diff_words_style_elem {
690 const char *prefix;
691 const char *suffix;
692 const char *color; /* NULL; filled in by the setup code if
693 * color is enabled */
694 };
695
696 struct diff_words_style {
697 enum diff_words_type type;
698 struct diff_words_style_elem new, old, ctx;
699 const char *newline;
700 };
701
702 static struct diff_words_style diff_words_styles[] = {
703 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
704 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
705 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
706 };
707
708 struct diff_words_data {
709 struct diff_words_buffer minus, plus;
710 const char *current_plus;
711 int last_minus;
712 struct diff_options *opt;
713 regex_t *word_regex;
714 enum diff_words_type type;
715 struct diff_words_style *style;
716 };
717
718 static int fn_out_diff_words_write_helper(FILE *fp,
719 struct diff_words_style_elem *st_el,
720 const char *newline,
721 size_t count, const char *buf,
722 const char *line_prefix)
723 {
724 int print = 0;
725
726 while (count) {
727 char *p = memchr(buf, '\n', count);
728 if (print)
729 fputs(line_prefix, fp);
730 if (p != buf) {
731 if (st_el->color && fputs(st_el->color, fp) < 0)
732 return -1;
733 if (fputs(st_el->prefix, fp) < 0 ||
734 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
735 fputs(st_el->suffix, fp) < 0)
736 return -1;
737 if (st_el->color && *st_el->color
738 && fputs(GIT_COLOR_RESET, fp) < 0)
739 return -1;
740 }
741 if (!p)
742 return 0;
743 if (fputs(newline, fp) < 0)
744 return -1;
745 count -= p + 1 - buf;
746 buf = p + 1;
747 print = 1;
748 }
749 return 0;
750 }
751
752 /*
753 * '--color-words' algorithm can be described as:
754 *
755 * 1. collect a the minus/plus lines of a diff hunk, divided into
756 * minus-lines and plus-lines;
757 *
758 * 2. break both minus-lines and plus-lines into words and
759 * place them into two mmfile_t with one word for each line;
760 *
761 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
762 *
763 * And for the common parts of the both file, we output the plus side text.
764 * diff_words->current_plus is used to trace the current position of the plus file
765 * which printed. diff_words->last_minus is used to trace the last minus word
766 * printed.
767 *
768 * For '--graph' to work with '--color-words', we need to output the graph prefix
769 * on each line of color words output. Generally, there are two conditions on
770 * which we should output the prefix.
771 *
772 * 1. diff_words->last_minus == 0 &&
773 * diff_words->current_plus == diff_words->plus.text.ptr
774 *
775 * that is: the plus text must start as a new line, and if there is no minus
776 * word printed, a graph prefix must be printed.
777 *
778 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
779 * *(diff_words->current_plus - 1) == '\n'
780 *
781 * that is: a graph prefix must be printed following a '\n'
782 */
783 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
784 {
785 if ((diff_words->last_minus == 0 &&
786 diff_words->current_plus == diff_words->plus.text.ptr) ||
787 (diff_words->current_plus > diff_words->plus.text.ptr &&
788 *(diff_words->current_plus - 1) == '\n')) {
789 return 1;
790 } else {
791 return 0;
792 }
793 }
794
795 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
796 {
797 struct diff_words_data *diff_words = priv;
798 struct diff_words_style *style = diff_words->style;
799 int minus_first, minus_len, plus_first, plus_len;
800 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
801 struct diff_options *opt = diff_words->opt;
802 struct strbuf *msgbuf;
803 char *line_prefix = "";
804
805 if (line[0] != '@' || parse_hunk_header(line, len,
806 &minus_first, &minus_len, &plus_first, &plus_len))
807 return;
808
809 assert(opt);
810 if (opt->output_prefix) {
811 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
812 line_prefix = msgbuf->buf;
813 }
814
815 /* POSIX requires that first be decremented by one if len == 0... */
816 if (minus_len) {
817 minus_begin = diff_words->minus.orig[minus_first].begin;
818 minus_end =
819 diff_words->minus.orig[minus_first + minus_len - 1].end;
820 } else
821 minus_begin = minus_end =
822 diff_words->minus.orig[minus_first].end;
823
824 if (plus_len) {
825 plus_begin = diff_words->plus.orig[plus_first].begin;
826 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
827 } else
828 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
829
830 if (color_words_output_graph_prefix(diff_words)) {
831 fputs(line_prefix, diff_words->opt->file);
832 }
833 if (diff_words->current_plus != plus_begin) {
834 fn_out_diff_words_write_helper(diff_words->opt->file,
835 &style->ctx, style->newline,
836 plus_begin - diff_words->current_plus,
837 diff_words->current_plus, line_prefix);
838 if (*(plus_begin - 1) == '\n')
839 fputs(line_prefix, diff_words->opt->file);
840 }
841 if (minus_begin != minus_end) {
842 fn_out_diff_words_write_helper(diff_words->opt->file,
843 &style->old, style->newline,
844 minus_end - minus_begin, minus_begin,
845 line_prefix);
846 }
847 if (plus_begin != plus_end) {
848 fn_out_diff_words_write_helper(diff_words->opt->file,
849 &style->new, style->newline,
850 plus_end - plus_begin, plus_begin,
851 line_prefix);
852 }
853
854 diff_words->current_plus = plus_end;
855 diff_words->last_minus = minus_first;
856 }
857
858 /* This function starts looking at *begin, and returns 0 iff a word was found. */
859 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
860 int *begin, int *end)
861 {
862 if (word_regex && *begin < buffer->size) {
863 regmatch_t match[1];
864 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
865 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
866 '\n', match[0].rm_eo - match[0].rm_so);
867 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
868 *begin += match[0].rm_so;
869 return *begin >= *end;
870 }
871 return -1;
872 }
873
874 /* find the next word */
875 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
876 (*begin)++;
877 if (*begin >= buffer->size)
878 return -1;
879
880 /* find the end of the word */
881 *end = *begin + 1;
882 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
883 (*end)++;
884
885 return 0;
886 }
887
888 /*
889 * This function splits the words in buffer->text, stores the list with
890 * newline separator into out, and saves the offsets of the original words
891 * in buffer->orig.
892 */
893 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
894 regex_t *word_regex)
895 {
896 int i, j;
897 long alloc = 0;
898
899 out->size = 0;
900 out->ptr = NULL;
901
902 /* fake an empty "0th" word */
903 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
904 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
905 buffer->orig_nr = 1;
906
907 for (i = 0; i < buffer->text.size; i++) {
908 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
909 return;
910
911 /* store original boundaries */
912 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
913 buffer->orig_alloc);
914 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
915 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
916 buffer->orig_nr++;
917
918 /* store one word */
919 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
920 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
921 out->ptr[out->size + j - i] = '\n';
922 out->size += j - i + 1;
923
924 i = j - 1;
925 }
926 }
927
928 /* this executes the word diff on the accumulated buffers */
929 static void diff_words_show(struct diff_words_data *diff_words)
930 {
931 xpparam_t xpp;
932 xdemitconf_t xecfg;
933 mmfile_t minus, plus;
934 struct diff_words_style *style = diff_words->style;
935
936 struct diff_options *opt = diff_words->opt;
937 struct strbuf *msgbuf;
938 char *line_prefix = "";
939
940 assert(opt);
941 if (opt->output_prefix) {
942 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
943 line_prefix = msgbuf->buf;
944 }
945
946 /* special case: only removal */
947 if (!diff_words->plus.text.size) {
948 fputs(line_prefix, diff_words->opt->file);
949 fn_out_diff_words_write_helper(diff_words->opt->file,
950 &style->old, style->newline,
951 diff_words->minus.text.size,
952 diff_words->minus.text.ptr, line_prefix);
953 diff_words->minus.text.size = 0;
954 return;
955 }
956
957 diff_words->current_plus = diff_words->plus.text.ptr;
958 diff_words->last_minus = 0;
959
960 memset(&xpp, 0, sizeof(xpp));
961 memset(&xecfg, 0, sizeof(xecfg));
962 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
963 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
964 xpp.flags = 0;
965 /* as only the hunk header will be parsed, we need a 0-context */
966 xecfg.ctxlen = 0;
967 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
968 &xpp, &xecfg);
969 free(minus.ptr);
970 free(plus.ptr);
971 if (diff_words->current_plus != diff_words->plus.text.ptr +
972 diff_words->plus.text.size) {
973 if (color_words_output_graph_prefix(diff_words))
974 fputs(line_prefix, diff_words->opt->file);
975 fn_out_diff_words_write_helper(diff_words->opt->file,
976 &style->ctx, style->newline,
977 diff_words->plus.text.ptr + diff_words->plus.text.size
978 - diff_words->current_plus, diff_words->current_plus,
979 line_prefix);
980 }
981 diff_words->minus.text.size = diff_words->plus.text.size = 0;
982 }
983
984 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
985 static void diff_words_flush(struct emit_callback *ecbdata)
986 {
987 if (ecbdata->diff_words->minus.text.size ||
988 ecbdata->diff_words->plus.text.size)
989 diff_words_show(ecbdata->diff_words);
990 }
991
992 static void diff_filespec_load_driver(struct diff_filespec *one)
993 {
994 /* Use already-loaded driver */
995 if (one->driver)
996 return;
997
998 if (S_ISREG(one->mode))
999 one->driver = userdiff_find_by_path(one->path);
1000
1001 /* Fallback to default settings */
1002 if (!one->driver)
1003 one->driver = userdiff_find_by_name("default");
1004 }
1005
1006 static const char *userdiff_word_regex(struct diff_filespec *one)
1007 {
1008 diff_filespec_load_driver(one);
1009 return one->driver->word_regex;
1010 }
1011
1012 static void init_diff_words_data(struct emit_callback *ecbdata,
1013 struct diff_options *orig_opts,
1014 struct diff_filespec *one,
1015 struct diff_filespec *two)
1016 {
1017 int i;
1018 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1019 memcpy(o, orig_opts, sizeof(struct diff_options));
1020
1021 ecbdata->diff_words =
1022 xcalloc(1, sizeof(struct diff_words_data));
1023 ecbdata->diff_words->type = o->word_diff;
1024 ecbdata->diff_words->opt = o;
1025 if (!o->word_regex)
1026 o->word_regex = userdiff_word_regex(one);
1027 if (!o->word_regex)
1028 o->word_regex = userdiff_word_regex(two);
1029 if (!o->word_regex)
1030 o->word_regex = diff_word_regex_cfg;
1031 if (o->word_regex) {
1032 ecbdata->diff_words->word_regex = (regex_t *)
1033 xmalloc(sizeof(regex_t));
1034 if (regcomp(ecbdata->diff_words->word_regex,
1035 o->word_regex,
1036 REG_EXTENDED | REG_NEWLINE))
1037 die ("Invalid regular expression: %s",
1038 o->word_regex);
1039 }
1040 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1041 if (o->word_diff == diff_words_styles[i].type) {
1042 ecbdata->diff_words->style =
1043 &diff_words_styles[i];
1044 break;
1045 }
1046 }
1047 if (want_color(o->use_color)) {
1048 struct diff_words_style *st = ecbdata->diff_words->style;
1049 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1050 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1051 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1052 }
1053 }
1054
1055 static void free_diff_words_data(struct emit_callback *ecbdata)
1056 {
1057 if (ecbdata->diff_words) {
1058 diff_words_flush(ecbdata);
1059 free (ecbdata->diff_words->opt);
1060 free (ecbdata->diff_words->minus.text.ptr);
1061 free (ecbdata->diff_words->minus.orig);
1062 free (ecbdata->diff_words->plus.text.ptr);
1063 free (ecbdata->diff_words->plus.orig);
1064 if (ecbdata->diff_words->word_regex) {
1065 regfree(ecbdata->diff_words->word_regex);
1066 free(ecbdata->diff_words->word_regex);
1067 }
1068 free(ecbdata->diff_words);
1069 ecbdata->diff_words = NULL;
1070 }
1071 }
1072
1073 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1074 {
1075 if (want_color(diff_use_color))
1076 return diff_colors[ix];
1077 return "";
1078 }
1079
1080 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1081 {
1082 const char *cp;
1083 unsigned long allot;
1084 size_t l = len;
1085
1086 if (ecb->truncate)
1087 return ecb->truncate(line, len);
1088 cp = line;
1089 allot = l;
1090 while (0 < l) {
1091 (void) utf8_width(&cp, &l);
1092 if (!cp)
1093 break; /* truncated in the middle? */
1094 }
1095 return allot - l;
1096 }
1097
1098 static void find_lno(const char *line, struct emit_callback *ecbdata)
1099 {
1100 const char *p;
1101 ecbdata->lno_in_preimage = 0;
1102 ecbdata->lno_in_postimage = 0;
1103 p = strchr(line, '-');
1104 if (!p)
1105 return; /* cannot happen */
1106 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1107 p = strchr(p, '+');
1108 if (!p)
1109 return; /* cannot happen */
1110 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1111 }
1112
1113 static void fn_out_consume(void *priv, char *line, unsigned long len)
1114 {
1115 struct emit_callback *ecbdata = priv;
1116 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1117 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1118 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1119 struct diff_options *o = ecbdata->opt;
1120 char *line_prefix = "";
1121 struct strbuf *msgbuf;
1122
1123 if (o && o->output_prefix) {
1124 msgbuf = o->output_prefix(o, o->output_prefix_data);
1125 line_prefix = msgbuf->buf;
1126 }
1127
1128 if (ecbdata->header) {
1129 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1130 strbuf_reset(ecbdata->header);
1131 ecbdata->header = NULL;
1132 }
1133 *(ecbdata->found_changesp) = 1;
1134
1135 if (ecbdata->label_path[0]) {
1136 const char *name_a_tab, *name_b_tab;
1137
1138 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1139 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1140
1141 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1142 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1143 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1144 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1145 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1146 }
1147
1148 if (diff_suppress_blank_empty
1149 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1150 line[0] = '\n';
1151 len = 1;
1152 }
1153
1154 if (line[0] == '@') {
1155 if (ecbdata->diff_words)
1156 diff_words_flush(ecbdata);
1157 len = sane_truncate_line(ecbdata, line, len);
1158 find_lno(line, ecbdata);
1159 emit_hunk_header(ecbdata, line, len);
1160 if (line[len-1] != '\n')
1161 putc('\n', ecbdata->opt->file);
1162 return;
1163 }
1164
1165 if (len < 1) {
1166 emit_line(ecbdata->opt, reset, reset, line, len);
1167 if (ecbdata->diff_words
1168 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1169 fputs("~\n", ecbdata->opt->file);
1170 return;
1171 }
1172
1173 if (ecbdata->diff_words) {
1174 if (line[0] == '-') {
1175 diff_words_append(line, len,
1176 &ecbdata->diff_words->minus);
1177 return;
1178 } else if (line[0] == '+') {
1179 diff_words_append(line, len,
1180 &ecbdata->diff_words->plus);
1181 return;
1182 } else if (!prefixcmp(line, "\\ ")) {
1183 /*
1184 * Eat the "no newline at eof" marker as if we
1185 * saw a "+" or "-" line with nothing on it,
1186 * and return without diff_words_flush() to
1187 * defer processing. If this is the end of
1188 * preimage, more "+" lines may come after it.
1189 */
1190 return;
1191 }
1192 diff_words_flush(ecbdata);
1193 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1194 emit_line(ecbdata->opt, plain, reset, line, len);
1195 fputs("~\n", ecbdata->opt->file);
1196 } else {
1197 /*
1198 * Skip the prefix character, if any. With
1199 * diff_suppress_blank_empty, there may be
1200 * none.
1201 */
1202 if (line[0] != '\n') {
1203 line++;
1204 len--;
1205 }
1206 emit_line(ecbdata->opt, plain, reset, line, len);
1207 }
1208 return;
1209 }
1210
1211 if (line[0] != '+') {
1212 const char *color =
1213 diff_get_color(ecbdata->color_diff,
1214 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1215 ecbdata->lno_in_preimage++;
1216 if (line[0] == ' ')
1217 ecbdata->lno_in_postimage++;
1218 emit_line(ecbdata->opt, color, reset, line, len);
1219 } else {
1220 ecbdata->lno_in_postimage++;
1221 emit_add_line(reset, ecbdata, line + 1, len - 1);
1222 }
1223 }
1224
1225 static char *pprint_rename(const char *a, const char *b)
1226 {
1227 const char *old = a;
1228 const char *new = b;
1229 struct strbuf name = STRBUF_INIT;
1230 int pfx_length, sfx_length;
1231 int len_a = strlen(a);
1232 int len_b = strlen(b);
1233 int a_midlen, b_midlen;
1234 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1235 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1236
1237 if (qlen_a || qlen_b) {
1238 quote_c_style(a, &name, NULL, 0);
1239 strbuf_addstr(&name, " => ");
1240 quote_c_style(b, &name, NULL, 0);
1241 return strbuf_detach(&name, NULL);
1242 }
1243
1244 /* Find common prefix */
1245 pfx_length = 0;
1246 while (*old && *new && *old == *new) {
1247 if (*old == '/')
1248 pfx_length = old - a + 1;
1249 old++;
1250 new++;
1251 }
1252
1253 /* Find common suffix */
1254 old = a + len_a;
1255 new = b + len_b;
1256 sfx_length = 0;
1257 while (a <= old && b <= new && *old == *new) {
1258 if (*old == '/')
1259 sfx_length = len_a - (old - a);
1260 old--;
1261 new--;
1262 }
1263
1264 /*
1265 * pfx{mid-a => mid-b}sfx
1266 * {pfx-a => pfx-b}sfx
1267 * pfx{sfx-a => sfx-b}
1268 * name-a => name-b
1269 */
1270 a_midlen = len_a - pfx_length - sfx_length;
1271 b_midlen = len_b - pfx_length - sfx_length;
1272 if (a_midlen < 0)
1273 a_midlen = 0;
1274 if (b_midlen < 0)
1275 b_midlen = 0;
1276
1277 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1278 if (pfx_length + sfx_length) {
1279 strbuf_add(&name, a, pfx_length);
1280 strbuf_addch(&name, '{');
1281 }
1282 strbuf_add(&name, a + pfx_length, a_midlen);
1283 strbuf_addstr(&name, " => ");
1284 strbuf_add(&name, b + pfx_length, b_midlen);
1285 if (pfx_length + sfx_length) {
1286 strbuf_addch(&name, '}');
1287 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1288 }
1289 return strbuf_detach(&name, NULL);
1290 }
1291
1292 struct diffstat_t {
1293 int nr;
1294 int alloc;
1295 struct diffstat_file {
1296 char *from_name;
1297 char *name;
1298 char *print_name;
1299 unsigned is_unmerged:1;
1300 unsigned is_binary:1;
1301 unsigned is_renamed:1;
1302 uintmax_t added, deleted;
1303 } **files;
1304 };
1305
1306 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1307 const char *name_a,
1308 const char *name_b)
1309 {
1310 struct diffstat_file *x;
1311 x = xcalloc(sizeof (*x), 1);
1312 if (diffstat->nr == diffstat->alloc) {
1313 diffstat->alloc = alloc_nr(diffstat->alloc);
1314 diffstat->files = xrealloc(diffstat->files,
1315 diffstat->alloc * sizeof(x));
1316 }
1317 diffstat->files[diffstat->nr++] = x;
1318 if (name_b) {
1319 x->from_name = xstrdup(name_a);
1320 x->name = xstrdup(name_b);
1321 x->is_renamed = 1;
1322 }
1323 else {
1324 x->from_name = NULL;
1325 x->name = xstrdup(name_a);
1326 }
1327 return x;
1328 }
1329
1330 static void diffstat_consume(void *priv, char *line, unsigned long len)
1331 {
1332 struct diffstat_t *diffstat = priv;
1333 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1334
1335 if (line[0] == '+')
1336 x->added++;
1337 else if (line[0] == '-')
1338 x->deleted++;
1339 }
1340
1341 const char mime_boundary_leader[] = "------------";
1342
1343 static int scale_linear(int it, int width, int max_change)
1344 {
1345 if (!it)
1346 return 0;
1347 /*
1348 * make sure that at least one '-' or '+' is printed if
1349 * there is any change to this path. The easiest way is to
1350 * scale linearly as if the alloted width is one column shorter
1351 * than it is, and then add 1 to the result.
1352 */
1353 return 1 + (it * (width - 1) / max_change);
1354 }
1355
1356 static void show_name(FILE *file,
1357 const char *prefix, const char *name, int len)
1358 {
1359 fprintf(file, " %s%-*s |", prefix, len, name);
1360 }
1361
1362 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1363 {
1364 if (cnt <= 0)
1365 return;
1366 fprintf(file, "%s", set);
1367 while (cnt--)
1368 putc(ch, file);
1369 fprintf(file, "%s", reset);
1370 }
1371
1372 static void fill_print_name(struct diffstat_file *file)
1373 {
1374 char *pname;
1375
1376 if (file->print_name)
1377 return;
1378
1379 if (!file->is_renamed) {
1380 struct strbuf buf = STRBUF_INIT;
1381 if (quote_c_style(file->name, &buf, NULL, 0)) {
1382 pname = strbuf_detach(&buf, NULL);
1383 } else {
1384 pname = file->name;
1385 strbuf_release(&buf);
1386 }
1387 } else {
1388 pname = pprint_rename(file->from_name, file->name);
1389 }
1390 file->print_name = pname;
1391 }
1392
1393 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1394 {
1395 struct strbuf sb = STRBUF_INIT;
1396 int ret;
1397
1398 if (!files) {
1399 assert(insertions == 0 && deletions == 0);
1400 return fputs(_(" 0 files changed\n"), fp);
1401 }
1402
1403 strbuf_addf(&sb,
1404 Q_(" %d file changed", " %d files changed", files),
1405 files);
1406
1407 /*
1408 * For binary diff, the caller may want to print "x files
1409 * changed" with insertions == 0 && deletions == 0.
1410 *
1411 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1412 * is probably less confusing (i.e skip over "2 files changed
1413 * but nothing about added/removed lines? Is this a bug in Git?").
1414 */
1415 if (insertions || deletions == 0) {
1416 /*
1417 * TRANSLATORS: "+" in (+) is a line addition marker;
1418 * do not translate it.
1419 */
1420 strbuf_addf(&sb,
1421 Q_(", %d insertion(+)", ", %d insertions(+)",
1422 insertions),
1423 insertions);
1424 }
1425
1426 if (deletions || insertions == 0) {
1427 /*
1428 * TRANSLATORS: "-" in (-) is a line removal marker;
1429 * do not translate it.
1430 */
1431 strbuf_addf(&sb,
1432 Q_(", %d deletion(-)", ", %d deletions(-)",
1433 deletions),
1434 deletions);
1435 }
1436 strbuf_addch(&sb, '\n');
1437 ret = fputs(sb.buf, fp);
1438 strbuf_release(&sb);
1439 return ret;
1440 }
1441
1442 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1443 {
1444 int i, len, add, del, adds = 0, dels = 0;
1445 uintmax_t max_change = 0, max_len = 0;
1446 int total_files = data->nr, count;
1447 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1448 const char *reset, *add_c, *del_c;
1449 const char *line_prefix = "";
1450 int extra_shown = 0;
1451 struct strbuf *msg = NULL;
1452
1453 if (data->nr == 0)
1454 return;
1455
1456 if (options->output_prefix) {
1457 msg = options->output_prefix(options, options->output_prefix_data);
1458 line_prefix = msg->buf;
1459 }
1460
1461 count = options->stat_count ? options->stat_count : data->nr;
1462
1463 reset = diff_get_color_opt(options, DIFF_RESET);
1464 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1465 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1466
1467 /*
1468 * Find the longest filename and max number of changes
1469 */
1470 for (i = 0; (i < count) && (i < data->nr); i++) {
1471 struct diffstat_file *file = data->files[i];
1472 uintmax_t change = file->added + file->deleted;
1473 if (!data->files[i]->is_renamed &&
1474 (change == 0)) {
1475 count++; /* not shown == room for one more */
1476 continue;
1477 }
1478 fill_print_name(file);
1479 len = strlen(file->print_name);
1480 if (max_len < len)
1481 max_len = len;
1482
1483 if (file->is_unmerged) {
1484 /* "Unmerged" is 8 characters */
1485 bin_width = bin_width < 8 ? 8 : bin_width;
1486 continue;
1487 }
1488 if (file->is_binary) {
1489 /* "Bin XXX -> YYY bytes" */
1490 int w = 14 + decimal_width(file->added)
1491 + decimal_width(file->deleted);
1492 bin_width = bin_width < w ? w : bin_width;
1493 /* Display change counts aligned with "Bin" */
1494 number_width = 3;
1495 continue;
1496 }
1497
1498 if (max_change < change)
1499 max_change = change;
1500 }
1501 count = i; /* min(count, data->nr) */
1502
1503 /*
1504 * We have width = stat_width or term_columns() columns total.
1505 * We want a maximum of min(max_len, stat_name_width) for the name part.
1506 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1507 * We also need 1 for " " and 4 + decimal_width(max_change)
1508 * for " | NNNN " and one the empty column at the end, altogether
1509 * 6 + decimal_width(max_change).
1510 *
1511 * If there's not enough space, we will use the smaller of
1512 * stat_name_width (if set) and 5/8*width for the filename,
1513 * and the rest for constant elements + graph part, but no more
1514 * than stat_graph_width for the graph part.
1515 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1516 * for the standard terminal size).
1517 *
1518 * In other words: stat_width limits the maximum width, and
1519 * stat_name_width fixes the maximum width of the filename,
1520 * and is also used to divide available columns if there
1521 * aren't enough.
1522 *
1523 * Binary files are displayed with "Bin XXX -> YYY bytes"
1524 * instead of the change count and graph. This part is treated
1525 * similarly to the graph part, except that it is not
1526 * "scaled". If total width is too small to accomodate the
1527 * guaranteed minimum width of the filename part and the
1528 * separators and this message, this message will "overflow"
1529 * making the line longer than the maximum width.
1530 */
1531
1532 if (options->stat_width == -1)
1533 width = term_columns() - options->output_prefix_length;
1534 else
1535 width = options->stat_width ? options->stat_width : 80;
1536 number_width = decimal_width(max_change) > number_width ?
1537 decimal_width(max_change) : number_width;
1538
1539 if (options->stat_graph_width == -1)
1540 options->stat_graph_width = diff_stat_graph_width;
1541
1542 /*
1543 * Guarantee 3/8*16==6 for the graph part
1544 * and 5/8*16==10 for the filename part
1545 */
1546 if (width < 16 + 6 + number_width)
1547 width = 16 + 6 + number_width;
1548
1549 /*
1550 * First assign sizes that are wanted, ignoring available width.
1551 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1552 * starting from "XXX" should fit in graph_width.
1553 */
1554 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1555 if (options->stat_graph_width &&
1556 options->stat_graph_width < graph_width)
1557 graph_width = options->stat_graph_width;
1558
1559 name_width = (options->stat_name_width > 0 &&
1560 options->stat_name_width < max_len) ?
1561 options->stat_name_width : max_len;
1562
1563 /*
1564 * Adjust adjustable widths not to exceed maximum width
1565 */
1566 if (name_width + number_width + 6 + graph_width > width) {
1567 if (graph_width > width * 3/8 - number_width - 6) {
1568 graph_width = width * 3/8 - number_width - 6;
1569 if (graph_width < 6)
1570 graph_width = 6;
1571 }
1572
1573 if (options->stat_graph_width &&
1574 graph_width > options->stat_graph_width)
1575 graph_width = options->stat_graph_width;
1576 if (name_width > width - number_width - 6 - graph_width)
1577 name_width = width - number_width - 6 - graph_width;
1578 else
1579 graph_width = width - number_width - 6 - name_width;
1580 }
1581
1582 /*
1583 * From here name_width is the width of the name area,
1584 * and graph_width is the width of the graph area.
1585 * max_change is used to scale graph properly.
1586 */
1587 for (i = 0; i < count; i++) {
1588 const char *prefix = "";
1589 char *name = data->files[i]->print_name;
1590 uintmax_t added = data->files[i]->added;
1591 uintmax_t deleted = data->files[i]->deleted;
1592 int name_len;
1593
1594 if (!data->files[i]->is_renamed &&
1595 (added + deleted == 0)) {
1596 total_files--;
1597 continue;
1598 }
1599 /*
1600 * "scale" the filename
1601 */
1602 len = name_width;
1603 name_len = strlen(name);
1604 if (name_width < name_len) {
1605 char *slash;
1606 prefix = "...";
1607 len -= 3;
1608 name += name_len - len;
1609 slash = strchr(name, '/');
1610 if (slash)
1611 name = slash;
1612 }
1613
1614 if (data->files[i]->is_binary) {
1615 fprintf(options->file, "%s", line_prefix);
1616 show_name(options->file, prefix, name, len);
1617 fprintf(options->file, " %*s", number_width, "Bin");
1618 if (!added && !deleted) {
1619 putc('\n', options->file);
1620 continue;
1621 }
1622 fprintf(options->file, " %s%"PRIuMAX"%s",
1623 del_c, deleted, reset);
1624 fprintf(options->file, " -> ");
1625 fprintf(options->file, "%s%"PRIuMAX"%s",
1626 add_c, added, reset);
1627 fprintf(options->file, " bytes");
1628 fprintf(options->file, "\n");
1629 continue;
1630 }
1631 else if (data->files[i]->is_unmerged) {
1632 fprintf(options->file, "%s", line_prefix);
1633 show_name(options->file, prefix, name, len);
1634 fprintf(options->file, " Unmerged\n");
1635 continue;
1636 }
1637
1638 /*
1639 * scale the add/delete
1640 */
1641 add = added;
1642 del = deleted;
1643 adds += add;
1644 dels += del;
1645
1646 if (graph_width <= max_change) {
1647 int total = add + del;
1648
1649 total = scale_linear(add + del, graph_width, max_change);
1650 if (total < 2 && add && del)
1651 /* width >= 2 due to the sanity check */
1652 total = 2;
1653 if (add < del) {
1654 add = scale_linear(add, graph_width, max_change);
1655 del = total - add;
1656 } else {
1657 del = scale_linear(del, graph_width, max_change);
1658 add = total - del;
1659 }
1660 }
1661 fprintf(options->file, "%s", line_prefix);
1662 show_name(options->file, prefix, name, len);
1663 fprintf(options->file, " %*"PRIuMAX"%s",
1664 number_width, added + deleted,
1665 added + deleted ? " " : "");
1666 show_graph(options->file, '+', add, add_c, reset);
1667 show_graph(options->file, '-', del, del_c, reset);
1668 fprintf(options->file, "\n");
1669 }
1670 for (i = count; i < data->nr; i++) {
1671 uintmax_t added = data->files[i]->added;
1672 uintmax_t deleted = data->files[i]->deleted;
1673 if (!data->files[i]->is_renamed &&
1674 (added + deleted == 0)) {
1675 total_files--;
1676 continue;
1677 }
1678 adds += added;
1679 dels += deleted;
1680 if (!extra_shown)
1681 fprintf(options->file, "%s ...\n", line_prefix);
1682 extra_shown = 1;
1683 }
1684 fprintf(options->file, "%s", line_prefix);
1685 print_stat_summary(options->file, total_files, adds, dels);
1686 }
1687
1688 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1689 {
1690 int i, adds = 0, dels = 0, total_files = data->nr;
1691
1692 if (data->nr == 0)
1693 return;
1694
1695 for (i = 0; i < data->nr; i++) {
1696 int added = data->files[i]->added;
1697 int deleted= data->files[i]->deleted;
1698
1699 if (data->files[i]->is_unmerged)
1700 continue;
1701 if (!data->files[i]->is_renamed && (added + deleted == 0)) {
1702 total_files--;
1703 } else {
1704 adds += added;
1705 dels += deleted;
1706 }
1707 }
1708 if (options->output_prefix) {
1709 struct strbuf *msg = NULL;
1710 msg = options->output_prefix(options,
1711 options->output_prefix_data);
1712 fprintf(options->file, "%s", msg->buf);
1713 }
1714 print_stat_summary(options->file, total_files, adds, dels);
1715 }
1716
1717 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1718 {
1719 int i;
1720
1721 if (data->nr == 0)
1722 return;
1723
1724 for (i = 0; i < data->nr; i++) {
1725 struct diffstat_file *file = data->files[i];
1726
1727 if (options->output_prefix) {
1728 struct strbuf *msg = NULL;
1729 msg = options->output_prefix(options,
1730 options->output_prefix_data);
1731 fprintf(options->file, "%s", msg->buf);
1732 }
1733
1734 if (file->is_binary)
1735 fprintf(options->file, "-\t-\t");
1736 else
1737 fprintf(options->file,
1738 "%"PRIuMAX"\t%"PRIuMAX"\t",
1739 file->added, file->deleted);
1740 if (options->line_termination) {
1741 fill_print_name(file);
1742 if (!file->is_renamed)
1743 write_name_quoted(file->name, options->file,
1744 options->line_termination);
1745 else {
1746 fputs(file->print_name, options->file);
1747 putc(options->line_termination, options->file);
1748 }
1749 } else {
1750 if (file->is_renamed) {
1751 putc('\0', options->file);
1752 write_name_quoted(file->from_name, options->file, '\0');
1753 }
1754 write_name_quoted(file->name, options->file, '\0');
1755 }
1756 }
1757 }
1758
1759 struct dirstat_file {
1760 const char *name;
1761 unsigned long changed;
1762 };
1763
1764 struct dirstat_dir {
1765 struct dirstat_file *files;
1766 int alloc, nr, permille, cumulative;
1767 };
1768
1769 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1770 unsigned long changed, const char *base, int baselen)
1771 {
1772 unsigned long this_dir = 0;
1773 unsigned int sources = 0;
1774 const char *line_prefix = "";
1775 struct strbuf *msg = NULL;
1776
1777 if (opt->output_prefix) {
1778 msg = opt->output_prefix(opt, opt->output_prefix_data);
1779 line_prefix = msg->buf;
1780 }
1781
1782 while (dir->nr) {
1783 struct dirstat_file *f = dir->files;
1784 int namelen = strlen(f->name);
1785 unsigned long this;
1786 char *slash;
1787
1788 if (namelen < baselen)
1789 break;
1790 if (memcmp(f->name, base, baselen))
1791 break;
1792 slash = strchr(f->name + baselen, '/');
1793 if (slash) {
1794 int newbaselen = slash + 1 - f->name;
1795 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1796 sources++;
1797 } else {
1798 this = f->changed;
1799 dir->files++;
1800 dir->nr--;
1801 sources += 2;
1802 }
1803 this_dir += this;
1804 }
1805
1806 /*
1807 * We don't report dirstat's for
1808 * - the top level
1809 * - or cases where everything came from a single directory
1810 * under this directory (sources == 1).
1811 */
1812 if (baselen && sources != 1) {
1813 if (this_dir) {
1814 int permille = this_dir * 1000 / changed;
1815 if (permille >= dir->permille) {
1816 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1817 permille / 10, permille % 10, baselen, base);
1818 if (!dir->cumulative)
1819 return 0;
1820 }
1821 }
1822 }
1823 return this_dir;
1824 }
1825
1826 static int dirstat_compare(const void *_a, const void *_b)
1827 {
1828 const struct dirstat_file *a = _a;
1829 const struct dirstat_file *b = _b;
1830 return strcmp(a->name, b->name);
1831 }
1832
1833 static void show_dirstat(struct diff_options *options)
1834 {
1835 int i;
1836 unsigned long changed;
1837 struct dirstat_dir dir;
1838 struct diff_queue_struct *q = &diff_queued_diff;
1839
1840 dir.files = NULL;
1841 dir.alloc = 0;
1842 dir.nr = 0;
1843 dir.permille = options->dirstat_permille;
1844 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1845
1846 changed = 0;
1847 for (i = 0; i < q->nr; i++) {
1848 struct diff_filepair *p = q->queue[i];
1849 const char *name;
1850 unsigned long copied, added, damage;
1851 int content_changed;
1852
1853 name = p->two->path ? p->two->path : p->one->path;
1854
1855 if (p->one->sha1_valid && p->two->sha1_valid)
1856 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1857 else
1858 content_changed = 1;
1859
1860 if (!content_changed) {
1861 /*
1862 * The SHA1 has not changed, so pre-/post-content is
1863 * identical. We can therefore skip looking at the
1864 * file contents altogether.
1865 */
1866 damage = 0;
1867 goto found_damage;
1868 }
1869
1870 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1871 /*
1872 * In --dirstat-by-file mode, we don't really need to
1873 * look at the actual file contents at all.
1874 * The fact that the SHA1 changed is enough for us to
1875 * add this file to the list of results
1876 * (with each file contributing equal damage).
1877 */
1878 damage = 1;
1879 goto found_damage;
1880 }
1881
1882 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1883 diff_populate_filespec(p->one, 0);
1884 diff_populate_filespec(p->two, 0);
1885 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1886 &copied, &added);
1887 diff_free_filespec_data(p->one);
1888 diff_free_filespec_data(p->two);
1889 } else if (DIFF_FILE_VALID(p->one)) {
1890 diff_populate_filespec(p->one, 1);
1891 copied = added = 0;
1892 diff_free_filespec_data(p->one);
1893 } else if (DIFF_FILE_VALID(p->two)) {
1894 diff_populate_filespec(p->two, 1);
1895 copied = 0;
1896 added = p->two->size;
1897 diff_free_filespec_data(p->two);
1898 } else
1899 continue;
1900
1901 /*
1902 * Original minus copied is the removed material,
1903 * added is the new material. They are both damages
1904 * made to the preimage.
1905 * If the resulting damage is zero, we know that
1906 * diffcore_count_changes() considers the two entries to
1907 * be identical, but since content_changed is true, we
1908 * know that there must have been _some_ kind of change,
1909 * so we force all entries to have damage > 0.
1910 */
1911 damage = (p->one->size - copied) + added;
1912 if (!damage)
1913 damage = 1;
1914
1915 found_damage:
1916 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1917 dir.files[dir.nr].name = name;
1918 dir.files[dir.nr].changed = damage;
1919 changed += damage;
1920 dir.nr++;
1921 }
1922
1923 /* This can happen even with many files, if everything was renames */
1924 if (!changed)
1925 return;
1926
1927 /* Show all directories with more than x% of the changes */
1928 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1929 gather_dirstat(options, &dir, changed, "", 0);
1930 }
1931
1932 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1933 {
1934 int i;
1935 unsigned long changed;
1936 struct dirstat_dir dir;
1937
1938 if (data->nr == 0)
1939 return;
1940
1941 dir.files = NULL;
1942 dir.alloc = 0;
1943 dir.nr = 0;
1944 dir.permille = options->dirstat_permille;
1945 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1946
1947 changed = 0;
1948 for (i = 0; i < data->nr; i++) {
1949 struct diffstat_file *file = data->files[i];
1950 unsigned long damage = file->added + file->deleted;
1951 if (file->is_binary)
1952 /*
1953 * binary files counts bytes, not lines. Must find some
1954 * way to normalize binary bytes vs. textual lines.
1955 * The following heuristic assumes that there are 64
1956 * bytes per "line".
1957 * This is stupid and ugly, but very cheap...
1958 */
1959 damage = (damage + 63) / 64;
1960 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1961 dir.files[dir.nr].name = file->name;
1962 dir.files[dir.nr].changed = damage;
1963 changed += damage;
1964 dir.nr++;
1965 }
1966
1967 /* This can happen even with many files, if everything was renames */
1968 if (!changed)
1969 return;
1970
1971 /* Show all directories with more than x% of the changes */
1972 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1973 gather_dirstat(options, &dir, changed, "", 0);
1974 }
1975
1976 static void free_diffstat_info(struct diffstat_t *diffstat)
1977 {
1978 int i;
1979 for (i = 0; i < diffstat->nr; i++) {
1980 struct diffstat_file *f = diffstat->files[i];
1981 if (f->name != f->print_name)
1982 free(f->print_name);
1983 free(f->name);
1984 free(f->from_name);
1985 free(f);
1986 }
1987 free(diffstat->files);
1988 }
1989
1990 struct checkdiff_t {
1991 const char *filename;
1992 int lineno;
1993 int conflict_marker_size;
1994 struct diff_options *o;
1995 unsigned ws_rule;
1996 unsigned status;
1997 };
1998
1999 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2000 {
2001 char firstchar;
2002 int cnt;
2003
2004 if (len < marker_size + 1)
2005 return 0;
2006 firstchar = line[0];
2007 switch (firstchar) {
2008 case '=': case '>': case '<': case '|':
2009 break;
2010 default:
2011 return 0;
2012 }
2013 for (cnt = 1; cnt < marker_size; cnt++)
2014 if (line[cnt] != firstchar)
2015 return 0;
2016 /* line[1] thru line[marker_size-1] are same as firstchar */
2017 if (len < marker_size + 1 || !isspace(line[marker_size]))
2018 return 0;
2019 return 1;
2020 }
2021
2022 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2023 {
2024 struct checkdiff_t *data = priv;
2025 int marker_size = data->conflict_marker_size;
2026 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2027 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2028 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2029 char *err;
2030 char *line_prefix = "";
2031 struct strbuf *msgbuf;
2032
2033 assert(data->o);
2034 if (data->o->output_prefix) {
2035 msgbuf = data->o->output_prefix(data->o,
2036 data->o->output_prefix_data);
2037 line_prefix = msgbuf->buf;
2038 }
2039
2040 if (line[0] == '+') {
2041 unsigned bad;
2042 data->lineno++;
2043 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2044 data->status |= 1;
2045 fprintf(data->o->file,
2046 "%s%s:%d: leftover conflict marker\n",
2047 line_prefix, data->filename, data->lineno);
2048 }
2049 bad = ws_check(line + 1, len - 1, data->ws_rule);
2050 if (!bad)
2051 return;
2052 data->status |= bad;
2053 err = whitespace_error_string(bad);
2054 fprintf(data->o->file, "%s%s:%d: %s.\n",
2055 line_prefix, data->filename, data->lineno, err);
2056 free(err);
2057 emit_line(data->o, set, reset, line, 1);
2058 ws_check_emit(line + 1, len - 1, data->ws_rule,
2059 data->o->file, set, reset, ws);
2060 } else if (line[0] == ' ') {
2061 data->lineno++;
2062 } else if (line[0] == '@') {
2063 char *plus = strchr(line, '+');
2064 if (plus)
2065 data->lineno = strtol(plus, NULL, 10) - 1;
2066 else
2067 die("invalid diff");
2068 }
2069 }
2070
2071 static unsigned char *deflate_it(char *data,
2072 unsigned long size,
2073 unsigned long *result_size)
2074 {
2075 int bound;
2076 unsigned char *deflated;
2077 git_zstream stream;
2078
2079 memset(&stream, 0, sizeof(stream));
2080 git_deflate_init(&stream, zlib_compression_level);
2081 bound = git_deflate_bound(&stream, size);
2082 deflated = xmalloc(bound);
2083 stream.next_out = deflated;
2084 stream.avail_out = bound;
2085
2086 stream.next_in = (unsigned char *)data;
2087 stream.avail_in = size;
2088 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2089 ; /* nothing */
2090 git_deflate_end(&stream);
2091 *result_size = stream.total_out;
2092 return deflated;
2093 }
2094
2095 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2096 {
2097 void *cp;
2098 void *delta;
2099 void *deflated;
2100 void *data;
2101 unsigned long orig_size;
2102 unsigned long delta_size;
2103 unsigned long deflate_size;
2104 unsigned long data_size;
2105
2106 /* We could do deflated delta, or we could do just deflated two,
2107 * whichever is smaller.
2108 */
2109 delta = NULL;
2110 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2111 if (one->size && two->size) {
2112 delta = diff_delta(one->ptr, one->size,
2113 two->ptr, two->size,
2114 &delta_size, deflate_size);
2115 if (delta) {
2116 void *to_free = delta;
2117 orig_size = delta_size;
2118 delta = deflate_it(delta, delta_size, &delta_size);
2119 free(to_free);
2120 }
2121 }
2122
2123 if (delta && delta_size < deflate_size) {
2124 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2125 free(deflated);
2126 data = delta;
2127 data_size = delta_size;
2128 }
2129 else {
2130 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2131 free(delta);
2132 data = deflated;
2133 data_size = deflate_size;
2134 }
2135
2136 /* emit data encoded in base85 */
2137 cp = data;
2138 while (data_size) {
2139 int bytes = (52 < data_size) ? 52 : data_size;
2140 char line[70];
2141 data_size -= bytes;
2142 if (bytes <= 26)
2143 line[0] = bytes + 'A' - 1;
2144 else
2145 line[0] = bytes - 26 + 'a' - 1;
2146 encode_85(line + 1, cp, bytes);
2147 cp = (char *) cp + bytes;
2148 fprintf(file, "%s", prefix);
2149 fputs(line, file);
2150 fputc('\n', file);
2151 }
2152 fprintf(file, "%s\n", prefix);
2153 free(data);
2154 }
2155
2156 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2157 {
2158 fprintf(file, "%sGIT binary patch\n", prefix);
2159 emit_binary_diff_body(file, one, two, prefix);
2160 emit_binary_diff_body(file, two, one, prefix);
2161 }
2162
2163 int diff_filespec_is_binary(struct diff_filespec *one)
2164 {
2165 if (one->is_binary == -1) {
2166 diff_filespec_load_driver(one);
2167 if (one->driver->binary != -1)
2168 one->is_binary = one->driver->binary;
2169 else {
2170 if (!one->data && DIFF_FILE_VALID(one))
2171 diff_populate_filespec(one, 0);
2172 if (one->data)
2173 one->is_binary = buffer_is_binary(one->data,
2174 one->size);
2175 if (one->is_binary == -1)
2176 one->is_binary = 0;
2177 }
2178 }
2179 return one->is_binary;
2180 }
2181
2182 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2183 {
2184 diff_filespec_load_driver(one);
2185 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2186 }
2187
2188 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2189 {
2190 if (!options->a_prefix)
2191 options->a_prefix = a;
2192 if (!options->b_prefix)
2193 options->b_prefix = b;
2194 }
2195
2196 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2197 {
2198 if (!DIFF_FILE_VALID(one))
2199 return NULL;
2200
2201 diff_filespec_load_driver(one);
2202 return userdiff_get_textconv(one->driver);
2203 }
2204
2205 static void builtin_diff(const char *name_a,
2206 const char *name_b,
2207 struct diff_filespec *one,
2208 struct diff_filespec *two,
2209 const char *xfrm_msg,
2210 int must_show_header,
2211 struct diff_options *o,
2212 int complete_rewrite)
2213 {
2214 mmfile_t mf1, mf2;
2215 const char *lbl[2];
2216 char *a_one, *b_two;
2217 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2218 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2219 const char *a_prefix, *b_prefix;
2220 struct userdiff_driver *textconv_one = NULL;
2221 struct userdiff_driver *textconv_two = NULL;
2222 struct strbuf header = STRBUF_INIT;
2223 struct strbuf *msgbuf;
2224 char *line_prefix = "";
2225
2226 if (o->output_prefix) {
2227 msgbuf = o->output_prefix(o, o->output_prefix_data);
2228 line_prefix = msgbuf->buf;
2229 }
2230
2231 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2232 (!one->mode || S_ISGITLINK(one->mode)) &&
2233 (!two->mode || S_ISGITLINK(two->mode))) {
2234 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2235 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2236 show_submodule_summary(o->file, one ? one->path : two->path,
2237 one->sha1, two->sha1, two->dirty_submodule,
2238 del, add, reset);
2239 return;
2240 }
2241
2242 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2243 textconv_one = get_textconv(one);
2244 textconv_two = get_textconv(two);
2245 }
2246
2247 diff_set_mnemonic_prefix(o, "a/", "b/");
2248 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2249 a_prefix = o->b_prefix;
2250 b_prefix = o->a_prefix;
2251 } else {
2252 a_prefix = o->a_prefix;
2253 b_prefix = o->b_prefix;
2254 }
2255
2256 /* Never use a non-valid filename anywhere if at all possible */
2257 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2258 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2259
2260 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2261 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2262 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2263 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2264 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2265 if (lbl[0][0] == '/') {
2266 /* /dev/null */
2267 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2268 if (xfrm_msg)
2269 strbuf_addstr(&header, xfrm_msg);
2270 must_show_header = 1;
2271 }
2272 else if (lbl[1][0] == '/') {
2273 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2274 if (xfrm_msg)
2275 strbuf_addstr(&header, xfrm_msg);
2276 must_show_header = 1;
2277 }
2278 else {
2279 if (one->mode != two->mode) {
2280 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2281 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2282 must_show_header = 1;
2283 }
2284 if (xfrm_msg)
2285 strbuf_addstr(&header, xfrm_msg);
2286
2287 /*
2288 * we do not run diff between different kind
2289 * of objects.
2290 */
2291 if ((one->mode ^ two->mode) & S_IFMT)
2292 goto free_ab_and_return;
2293 if (complete_rewrite &&
2294 (textconv_one || !diff_filespec_is_binary(one)) &&
2295 (textconv_two || !diff_filespec_is_binary(two))) {
2296 fprintf(o->file, "%s", header.buf);
2297 strbuf_reset(&header);
2298 emit_rewrite_diff(name_a, name_b, one, two,
2299 textconv_one, textconv_two, o);
2300 o->found_changes = 1;
2301 goto free_ab_and_return;
2302 }
2303 }
2304
2305 if (o->irreversible_delete && lbl[1][0] == '/') {
2306 fprintf(o->file, "%s", header.buf);
2307 strbuf_reset(&header);
2308 goto free_ab_and_return;
2309 } else if (!DIFF_OPT_TST(o, TEXT) &&
2310 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2311 (!textconv_two && diff_filespec_is_binary(two)) )) {
2312 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2313 die("unable to read files to diff");
2314 /* Quite common confusing case */
2315 if (mf1.size == mf2.size &&
2316 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2317 if (must_show_header)
2318 fprintf(o->file, "%s", header.buf);
2319 goto free_ab_and_return;
2320 }
2321 fprintf(o->file, "%s", header.buf);
2322 strbuf_reset(&header);
2323 if (DIFF_OPT_TST(o, BINARY))
2324 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2325 else
2326 fprintf(o->file, "%sBinary files %s and %s differ\n",
2327 line_prefix, lbl[0], lbl[1]);
2328 o->found_changes = 1;
2329 } else {
2330 /* Crazy xdl interfaces.. */
2331 const char *diffopts = getenv("GIT_DIFF_OPTS");
2332 xpparam_t xpp;
2333 xdemitconf_t xecfg;
2334 struct emit_callback ecbdata;
2335 const struct userdiff_funcname *pe;
2336
2337 if (must_show_header) {
2338 fprintf(o->file, "%s", header.buf);
2339 strbuf_reset(&header);
2340 }
2341
2342 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2343 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2344
2345 pe = diff_funcname_pattern(one);
2346 if (!pe)
2347 pe = diff_funcname_pattern(two);
2348
2349 memset(&xpp, 0, sizeof(xpp));
2350 memset(&xecfg, 0, sizeof(xecfg));
2351 memset(&ecbdata, 0, sizeof(ecbdata));
2352 ecbdata.label_path = lbl;
2353 ecbdata.color_diff = want_color(o->use_color);
2354 ecbdata.found_changesp = &o->found_changes;
2355 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2356 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2357 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2358 ecbdata.opt = o;
2359 ecbdata.header = header.len ? &header : NULL;
2360 xpp.flags = o->xdl_opts;
2361 xecfg.ctxlen = o->context;
2362 xecfg.interhunkctxlen = o->interhunkcontext;
2363 xecfg.flags = XDL_EMIT_FUNCNAMES;
2364 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2365 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2366 if (pe)
2367 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2368 if (!diffopts)
2369 ;
2370 else if (!prefixcmp(diffopts, "--unified="))
2371 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2372 else if (!prefixcmp(diffopts, "-u"))
2373 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2374 if (o->word_diff)
2375 init_diff_words_data(&ecbdata, o, one, two);
2376 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2377 &xpp, &xecfg);
2378 if (o->word_diff)
2379 free_diff_words_data(&ecbdata);
2380 if (textconv_one)
2381 free(mf1.ptr);
2382 if (textconv_two)
2383 free(mf2.ptr);
2384 xdiff_clear_find_func(&xecfg);
2385 }
2386
2387 free_ab_and_return:
2388 strbuf_release(&header);
2389 diff_free_filespec_data(one);
2390 diff_free_filespec_data(two);
2391 free(a_one);
2392 free(b_two);
2393 return;
2394 }
2395
2396 static void builtin_diffstat(const char *name_a, const char *name_b,
2397 struct diff_filespec *one,
2398 struct diff_filespec *two,
2399 struct diffstat_t *diffstat,
2400 struct diff_options *o,
2401 int complete_rewrite)
2402 {
2403 mmfile_t mf1, mf2;
2404 struct diffstat_file *data;
2405 int same_contents;
2406
2407 data = diffstat_add(diffstat, name_a, name_b);
2408
2409 if (!one || !two) {
2410 data->is_unmerged = 1;
2411 return;
2412 }
2413
2414 same_contents = !hashcmp(one->sha1, two->sha1);
2415
2416 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2417 data->is_binary = 1;
2418 if (same_contents) {
2419 data->added = 0;
2420 data->deleted = 0;
2421 } else {
2422 data->added = diff_filespec_size(two);
2423 data->deleted = diff_filespec_size(one);
2424 }
2425 }
2426
2427 else if (complete_rewrite) {
2428 diff_populate_filespec(one, 0);
2429 diff_populate_filespec(two, 0);
2430 data->deleted = count_lines(one->data, one->size);
2431 data->added = count_lines(two->data, two->size);
2432 }
2433
2434 else if (!same_contents) {
2435 /* Crazy xdl interfaces.. */
2436 xpparam_t xpp;
2437 xdemitconf_t xecfg;
2438
2439 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2440 die("unable to read files to diff");
2441
2442 memset(&xpp, 0, sizeof(xpp));
2443 memset(&xecfg, 0, sizeof(xecfg));
2444 xpp.flags = o->xdl_opts;
2445 xecfg.ctxlen = o->context;
2446 xecfg.interhunkctxlen = o->interhunkcontext;
2447 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2448 &xpp, &xecfg);
2449 }
2450
2451 diff_free_filespec_data(one);
2452 diff_free_filespec_data(two);
2453 }
2454
2455 static void builtin_checkdiff(const char *name_a, const char *name_b,
2456 const char *attr_path,
2457 struct diff_filespec *one,
2458 struct diff_filespec *two,
2459 struct diff_options *o)
2460 {
2461 mmfile_t mf1, mf2;
2462 struct checkdiff_t data;
2463
2464 if (!two)
2465 return;
2466
2467 memset(&data, 0, sizeof(data));
2468 data.filename = name_b ? name_b : name_a;
2469 data.lineno = 0;
2470 data.o = o;
2471 data.ws_rule = whitespace_rule(attr_path);
2472 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2473
2474 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2475 die("unable to read files to diff");
2476
2477 /*
2478 * All the other codepaths check both sides, but not checking
2479 * the "old" side here is deliberate. We are checking the newly
2480 * introduced changes, and as long as the "new" side is text, we
2481 * can and should check what it introduces.
2482 */
2483 if (diff_filespec_is_binary(two))
2484 goto free_and_return;
2485 else {
2486 /* Crazy xdl interfaces.. */
2487 xpparam_t xpp;
2488 xdemitconf_t xecfg;
2489
2490 memset(&xpp, 0, sizeof(xpp));
2491 memset(&xecfg, 0, sizeof(xecfg));
2492 xecfg.ctxlen = 1; /* at least one context line */
2493 xpp.flags = 0;
2494 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2495 &xpp, &xecfg);
2496
2497 if (data.ws_rule & WS_BLANK_AT_EOF) {
2498 struct emit_callback ecbdata;
2499 int blank_at_eof;
2500
2501 ecbdata.ws_rule = data.ws_rule;
2502 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2503 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2504
2505 if (blank_at_eof) {
2506 static char *err;
2507 if (!err)
2508 err = whitespace_error_string(WS_BLANK_AT_EOF);
2509 fprintf(o->file, "%s:%d: %s.\n",
2510 data.filename, blank_at_eof, err);
2511 data.status = 1; /* report errors */
2512 }
2513 }
2514 }
2515 free_and_return:
2516 diff_free_filespec_data(one);
2517 diff_free_filespec_data(two);
2518 if (data.status)
2519 DIFF_OPT_SET(o, CHECK_FAILED);
2520 }
2521
2522 struct diff_filespec *alloc_filespec(const char *path)
2523 {
2524 int namelen = strlen(path);
2525 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2526
2527 memset(spec, 0, sizeof(*spec));
2528 spec->path = (char *)(spec + 1);
2529 memcpy(spec->path, path, namelen+1);
2530 spec->count = 1;
2531 spec->is_binary = -1;
2532 return spec;
2533 }
2534
2535 void free_filespec(struct diff_filespec *spec)
2536 {
2537 if (!--spec->count) {
2538 diff_free_filespec_data(spec);
2539 free(spec);
2540 }
2541 }
2542
2543 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2544 unsigned short mode)
2545 {
2546 if (mode) {
2547 spec->mode = canon_mode(mode);
2548 hashcpy(spec->sha1, sha1);
2549 spec->sha1_valid = !is_null_sha1(sha1);
2550 }
2551 }
2552
2553 /*
2554 * Given a name and sha1 pair, if the index tells us the file in
2555 * the work tree has that object contents, return true, so that
2556 * prepare_temp_file() does not have to inflate and extract.
2557 */
2558 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2559 {
2560 struct cache_entry *ce;
2561 struct stat st;
2562 int pos, len;
2563
2564 /*
2565 * We do not read the cache ourselves here, because the
2566 * benchmark with my previous version that always reads cache
2567 * shows that it makes things worse for diff-tree comparing
2568 * two linux-2.6 kernel trees in an already checked out work
2569 * tree. This is because most diff-tree comparisons deal with
2570 * only a small number of files, while reading the cache is
2571 * expensive for a large project, and its cost outweighs the
2572 * savings we get by not inflating the object to a temporary
2573 * file. Practically, this code only helps when we are used
2574 * by diff-cache --cached, which does read the cache before
2575 * calling us.
2576 */
2577 if (!active_cache)
2578 return 0;
2579
2580 /* We want to avoid the working directory if our caller
2581 * doesn't need the data in a normal file, this system
2582 * is rather slow with its stat/open/mmap/close syscalls,
2583 * and the object is contained in a pack file. The pack
2584 * is probably already open and will be faster to obtain
2585 * the data through than the working directory. Loose
2586 * objects however would tend to be slower as they need
2587 * to be individually opened and inflated.
2588 */
2589 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2590 return 0;
2591
2592 len = strlen(name);
2593 pos = cache_name_pos(name, len);
2594 if (pos < 0)
2595 return 0;
2596 ce = active_cache[pos];
2597
2598 /*
2599 * This is not the sha1 we are looking for, or
2600 * unreusable because it is not a regular file.
2601 */
2602 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2603 return 0;
2604
2605 /*
2606 * If ce is marked as "assume unchanged", there is no
2607 * guarantee that work tree matches what we are looking for.
2608 */
2609 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2610 return 0;
2611
2612 /*
2613 * If ce matches the file in the work tree, we can reuse it.
2614 */
2615 if (ce_uptodate(ce) ||
2616 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2617 return 1;
2618
2619 return 0;
2620 }
2621
2622 static int populate_from_stdin(struct diff_filespec *s)
2623 {
2624 struct strbuf buf = STRBUF_INIT;
2625 size_t size = 0;
2626
2627 if (strbuf_read(&buf, 0, 0) < 0)
2628 return error("error while reading from stdin %s",
2629 strerror(errno));
2630
2631 s->should_munmap = 0;
2632 s->data = strbuf_detach(&buf, &size);
2633 s->size = size;
2634 s->should_free = 1;
2635 return 0;
2636 }
2637
2638 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2639 {
2640 int len;
2641 char *data = xmalloc(100), *dirty = "";
2642
2643 /* Are we looking at the work tree? */
2644 if (s->dirty_submodule)
2645 dirty = "-dirty";
2646
2647 len = snprintf(data, 100,
2648 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2649 s->data = data;
2650 s->size = len;
2651 s->should_free = 1;
2652 if (size_only) {
2653 s->data = NULL;
2654 free(data);
2655 }
2656 return 0;
2657 }
2658
2659 /*
2660 * While doing rename detection and pickaxe operation, we may need to
2661 * grab the data for the blob (or file) for our own in-core comparison.
2662 * diff_filespec has data and size fields for this purpose.
2663 */
2664 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2665 {
2666 int err = 0;
2667 if (!DIFF_FILE_VALID(s))
2668 die("internal error: asking to populate invalid file.");
2669 if (S_ISDIR(s->mode))
2670 return -1;
2671
2672 if (s->data)
2673 return 0;
2674
2675 if (size_only && 0 < s->size)
2676 return 0;
2677
2678 if (S_ISGITLINK(s->mode))
2679 return diff_populate_gitlink(s, size_only);
2680
2681 if (!s->sha1_valid ||
2682 reuse_worktree_file(s->path, s->sha1, 0)) {
2683 struct strbuf buf = STRBUF_INIT;
2684 struct stat st;
2685 int fd;
2686
2687 if (!strcmp(s->path, "-"))
2688 return populate_from_stdin(s);
2689
2690 if (lstat(s->path, &st) < 0) {
2691 if (errno == ENOENT) {
2692 err_empty:
2693 err = -1;
2694 empty:
2695 s->data = (char *)"";
2696 s->size = 0;
2697 return err;
2698 }
2699 }
2700 s->size = xsize_t(st.st_size);
2701 if (!s->size)
2702 goto empty;
2703 if (S_ISLNK(st.st_mode)) {
2704 struct strbuf sb = STRBUF_INIT;
2705
2706 if (strbuf_readlink(&sb, s->path, s->size))
2707 goto err_empty;
2708 s->size = sb.len;
2709 s->data = strbuf_detach(&sb, NULL);
2710 s->should_free = 1;
2711 return 0;
2712 }
2713 if (size_only)
2714 return 0;
2715 fd = open(s->path, O_RDONLY);
2716 if (fd < 0)
2717 goto err_empty;
2718 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2719 close(fd);
2720 s->should_munmap = 1;
2721
2722 /*
2723 * Convert from working tree format to canonical git format
2724 */
2725 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2726 size_t size = 0;
2727 munmap(s->data, s->size);
2728 s->should_munmap = 0;
2729 s->data = strbuf_detach(&buf, &size);
2730 s->size = size;
2731 s->should_free = 1;
2732 }
2733 }
2734 else {
2735 enum object_type type;
2736 if (size_only) {
2737 type = sha1_object_info(s->sha1, &s->size);
2738 if (type < 0)
2739 die("unable to read %s", sha1_to_hex(s->sha1));
2740 } else {
2741 s->data = read_sha1_file(s->sha1, &type, &s->size);
2742 if (!s->data)
2743 die("unable to read %s", sha1_to_hex(s->sha1));
2744 s->should_free = 1;
2745 }
2746 }
2747 return 0;
2748 }
2749
2750 void diff_free_filespec_blob(struct diff_filespec *s)
2751 {
2752 if (s->should_free)
2753 free(s->data);
2754 else if (s->should_munmap)
2755 munmap(s->data, s->size);
2756
2757 if (s->should_free || s->should_munmap) {
2758 s->should_free = s->should_munmap = 0;
2759 s->data = NULL;
2760 }
2761 }
2762
2763 void diff_free_filespec_data(struct diff_filespec *s)
2764 {
2765 diff_free_filespec_blob(s);
2766 free(s->cnt_data);
2767 s->cnt_data = NULL;
2768 }
2769
2770 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2771 void *blob,
2772 unsigned long size,
2773 const unsigned char *sha1,
2774 int mode)
2775 {
2776 int fd;
2777 struct strbuf buf = STRBUF_INIT;
2778 struct strbuf template = STRBUF_INIT;
2779 char *path_dup = xstrdup(path);
2780 const char *base = basename(path_dup);
2781
2782 /* Generate "XXXXXX_basename.ext" */
2783 strbuf_addstr(&template, "XXXXXX_");
2784 strbuf_addstr(&template, base);
2785
2786 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2787 strlen(base) + 1);
2788 if (fd < 0)
2789 die_errno("unable to create temp-file");
2790 if (convert_to_working_tree(path,
2791 (const char *)blob, (size_t)size, &buf)) {
2792 blob = buf.buf;
2793 size = buf.len;
2794 }
2795 if (write_in_full(fd, blob, size) != size)
2796 die_errno("unable to write temp-file");
2797 close(fd);
2798 temp->name = temp->tmp_path;
2799 strcpy(temp->hex, sha1_to_hex(sha1));
2800 temp->hex[40] = 0;
2801 sprintf(temp->mode, "%06o", mode);
2802 strbuf_release(&buf);
2803 strbuf_release(&template);
2804 free(path_dup);
2805 }
2806
2807 static struct diff_tempfile *prepare_temp_file(const char *name,
2808 struct diff_filespec *one)
2809 {
2810 struct diff_tempfile *temp = claim_diff_tempfile();
2811
2812 if (!DIFF_FILE_VALID(one)) {
2813 not_a_valid_file:
2814 /* A '-' entry produces this for file-2, and
2815 * a '+' entry produces this for file-1.
2816 */
2817 temp->name = "/dev/null";
2818 strcpy(temp->hex, ".");
2819 strcpy(temp->mode, ".");
2820 return temp;
2821 }
2822
2823 if (!remove_tempfile_installed) {
2824 atexit(remove_tempfile);
2825 sigchain_push_common(remove_tempfile_on_signal);
2826 remove_tempfile_installed = 1;
2827 }
2828
2829 if (!one->sha1_valid ||
2830 reuse_worktree_file(name, one->sha1, 1)) {
2831 struct stat st;
2832 if (lstat(name, &st) < 0) {
2833 if (errno == ENOENT)
2834 goto not_a_valid_file;
2835 die_errno("stat(%s)", name);
2836 }
2837 if (S_ISLNK(st.st_mode)) {
2838 struct strbuf sb = STRBUF_INIT;
2839 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2840 die_errno("readlink(%s)", name);
2841 prep_temp_blob(name, temp, sb.buf, sb.len,
2842 (one->sha1_valid ?
2843 one->sha1 : null_sha1),
2844 (one->sha1_valid ?
2845 one->mode : S_IFLNK));
2846 strbuf_release(&sb);
2847 }
2848 else {
2849 /* we can borrow from the file in the work tree */
2850 temp->name = name;
2851 if (!one->sha1_valid)
2852 strcpy(temp->hex, sha1_to_hex(null_sha1));
2853 else
2854 strcpy(temp->hex, sha1_to_hex(one->sha1));
2855 /* Even though we may sometimes borrow the
2856 * contents from the work tree, we always want
2857 * one->mode. mode is trustworthy even when
2858 * !(one->sha1_valid), as long as
2859 * DIFF_FILE_VALID(one).
2860 */
2861 sprintf(temp->mode, "%06o", one->mode);
2862 }
2863 return temp;
2864 }
2865 else {
2866 if (diff_populate_filespec(one, 0))
2867 die("cannot read data blob for %s", one->path);
2868 prep_temp_blob(name, temp, one->data, one->size,
2869 one->sha1, one->mode);
2870 }
2871 return temp;
2872 }
2873
2874 /* An external diff command takes:
2875 *
2876 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2877 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2878 *
2879 */
2880 static void run_external_diff(const char *pgm,
2881 const char *name,
2882 const char *other,
2883 struct diff_filespec *one,
2884 struct diff_filespec *two,
2885 const char *xfrm_msg,
2886 int complete_rewrite)
2887 {
2888 const char *spawn_arg[10];
2889 int retval;
2890 const char **arg = &spawn_arg[0];
2891
2892 if (one && two) {
2893 struct diff_tempfile *temp_one, *temp_two;
2894 const char *othername = (other ? other : name);
2895 temp_one = prepare_temp_file(name, one);
2896 temp_two = prepare_temp_file(othername, two);
2897 *arg++ = pgm;
2898 *arg++ = name;
2899 *arg++ = temp_one->name;
2900 *arg++ = temp_one->hex;
2901 *arg++ = temp_one->mode;
2902 *arg++ = temp_two->name;
2903 *arg++ = temp_two->hex;
2904 *arg++ = temp_two->mode;
2905 if (other) {
2906 *arg++ = other;
2907 *arg++ = xfrm_msg;
2908 }
2909 } else {
2910 *arg++ = pgm;
2911 *arg++ = name;
2912 }
2913 *arg = NULL;
2914 fflush(NULL);
2915 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2916 remove_tempfile();
2917 if (retval) {
2918 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2919 exit(1);
2920 }
2921 }
2922
2923 static int similarity_index(struct diff_filepair *p)
2924 {
2925 return p->score * 100 / MAX_SCORE;
2926 }
2927
2928 static void fill_metainfo(struct strbuf *msg,
2929 const char *name,
2930 const char *other,
2931 struct diff_filespec *one,
2932 struct diff_filespec *two,
2933 struct diff_options *o,
2934 struct diff_filepair *p,
2935 int *must_show_header,
2936 int use_color)
2937 {
2938 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2939 const char *reset = diff_get_color(use_color, DIFF_RESET);
2940 struct strbuf *msgbuf;
2941 char *line_prefix = "";
2942
2943 *must_show_header = 1;
2944 if (o->output_prefix) {
2945 msgbuf = o->output_prefix(o, o->output_prefix_data);
2946 line_prefix = msgbuf->buf;
2947 }
2948 strbuf_init(msg, PATH_MAX * 2 + 300);
2949 switch (p->status) {
2950 case DIFF_STATUS_COPIED:
2951 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2952 line_prefix, set, similarity_index(p));
2953 strbuf_addf(msg, "%s\n%s%scopy from ",
2954 reset, line_prefix, set);
2955 quote_c_style(name, msg, NULL, 0);
2956 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2957 quote_c_style(other, msg, NULL, 0);
2958 strbuf_addf(msg, "%s\n", reset);
2959 break;
2960 case DIFF_STATUS_RENAMED:
2961 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2962 line_prefix, set, similarity_index(p));
2963 strbuf_addf(msg, "%s\n%s%srename from ",
2964 reset, line_prefix, set);
2965 quote_c_style(name, msg, NULL, 0);
2966 strbuf_addf(msg, "%s\n%s%srename to ",
2967 reset, line_prefix, set);
2968 quote_c_style(other, msg, NULL, 0);
2969 strbuf_addf(msg, "%s\n", reset);
2970 break;
2971 case DIFF_STATUS_MODIFIED:
2972 if (p->score) {
2973 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2974 line_prefix,
2975 set, similarity_index(p), reset);
2976 break;
2977 }
2978 /* fallthru */
2979 default:
2980 *must_show_header = 0;
2981 }
2982 if (one && two && hashcmp(one->sha1, two->sha1)) {
2983 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2984
2985 if (DIFF_OPT_TST(o, BINARY)) {
2986 mmfile_t mf;
2987 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2988 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2989 abbrev = 40;
2990 }
2991 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2992 find_unique_abbrev(one->sha1, abbrev));
2993 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2994 if (one->mode == two->mode)
2995 strbuf_addf(msg, " %06o", one->mode);
2996 strbuf_addf(msg, "%s\n", reset);
2997 }
2998 }
2999
3000 static void run_diff_cmd(const char *pgm,
3001 const char *name,
3002 const char *other,
3003 const char *attr_path,
3004 struct diff_filespec *one,
3005 struct diff_filespec *two,
3006 struct strbuf *msg,
3007 struct diff_options *o,
3008 struct diff_filepair *p)
3009 {
3010 const char *xfrm_msg = NULL;
3011 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3012 int must_show_header = 0;
3013
3014 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3015 pgm = NULL;
3016 else {
3017 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3018 if (drv && drv->external)
3019 pgm = drv->external;
3020 }
3021
3022 if (msg) {
3023 /*
3024 * don't use colors when the header is intended for an
3025 * external diff driver
3026 */
3027 fill_metainfo(msg, name, other, one, two, o, p,
3028 &must_show_header,
3029 want_color(o->use_color) && !pgm);
3030 xfrm_msg = msg->len ? msg->buf : NULL;
3031 }
3032
3033 if (pgm) {
3034 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3035 complete_rewrite);
3036 return;
3037 }
3038 if (one && two)
3039 builtin_diff(name, other ? other : name,
3040 one, two, xfrm_msg, must_show_header,
3041 o, complete_rewrite);
3042 else
3043 fprintf(o->file, "* Unmerged path %s\n", name);
3044 }
3045
3046 static void diff_fill_sha1_info(struct diff_filespec *one)
3047 {
3048 if (DIFF_FILE_VALID(one)) {
3049 if (!one->sha1_valid) {
3050 struct stat st;
3051 if (!strcmp(one->path, "-")) {
3052 hashcpy(one->sha1, null_sha1);
3053 return;
3054 }
3055 if (lstat(one->path, &st) < 0)
3056 die_errno("stat '%s'", one->path);
3057 if (index_path(one->sha1, one->path, &st, 0))
3058 die("cannot hash %s", one->path);
3059 }
3060 }
3061 else
3062 hashclr(one->sha1);
3063 }
3064
3065 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3066 {
3067 /* Strip the prefix but do not molest /dev/null and absolute paths */
3068 if (*namep && **namep != '/') {
3069 *namep += prefix_length;
3070 if (**namep == '/')
3071 ++*namep;
3072 }
3073 if (*otherp && **otherp != '/') {
3074 *otherp += prefix_length;
3075 if (**otherp == '/')
3076 ++*otherp;
3077 }
3078 }
3079
3080 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3081 {
3082 const char *pgm = external_diff();
3083 struct strbuf msg;
3084 struct diff_filespec *one = p->one;
3085 struct diff_filespec *two = p->two;
3086 const char *name;
3087 const char *other;
3088 const char *attr_path;
3089
3090 name = p->one->path;
3091 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3092 attr_path = name;
3093 if (o->prefix_length)
3094 strip_prefix(o->prefix_length, &name, &other);
3095
3096 if (DIFF_PAIR_UNMERGED(p)) {
3097 run_diff_cmd(pgm, name, NULL, attr_path,
3098 NULL, NULL, NULL, o, p);
3099 return;
3100 }
3101
3102 diff_fill_sha1_info(one);
3103 diff_fill_sha1_info(two);
3104
3105 if (!pgm &&
3106 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3107 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3108 /*
3109 * a filepair that changes between file and symlink
3110 * needs to be split into deletion and creation.
3111 */
3112 struct diff_filespec *null = alloc_filespec(two->path);
3113 run_diff_cmd(NULL, name, other, attr_path,
3114 one, null, &msg, o, p);
3115 free(null);
3116 strbuf_release(&msg);
3117
3118 null = alloc_filespec(one->path);
3119 run_diff_cmd(NULL, name, other, attr_path,
3120 null, two, &msg, o, p);
3121 free(null);
3122 }
3123 else
3124 run_diff_cmd(pgm, name, other, attr_path,
3125 one, two, &msg, o, p);
3126
3127 strbuf_release(&msg);
3128 }
3129
3130 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3131 struct diffstat_t *diffstat)
3132 {
3133 const char *name;
3134 const char *other;
3135 int complete_rewrite = 0;
3136
3137 if (DIFF_PAIR_UNMERGED(p)) {
3138 /* unmerged */
3139 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
3140 return;
3141 }
3142
3143 name = p->one->path;
3144 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3145
3146 if (o->prefix_length)
3147 strip_prefix(o->prefix_length, &name, &other);
3148
3149 diff_fill_sha1_info(p->one);
3150 diff_fill_sha1_info(p->two);
3151
3152 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3153 complete_rewrite = 1;
3154 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
3155 }
3156
3157 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3158 {
3159 const char *name;
3160 const char *other;
3161 const char *attr_path;
3162
3163 if (DIFF_PAIR_UNMERGED(p)) {
3164 /* unmerged */
3165 return;
3166 }
3167
3168 name = p->one->path;
3169 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3170 attr_path = other ? other : name;
3171
3172 if (o->prefix_length)
3173 strip_prefix(o->prefix_length, &name, &other);
3174
3175 diff_fill_sha1_info(p->one);
3176 diff_fill_sha1_info(p->two);
3177
3178 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3179 }
3180
3181 void diff_setup(struct diff_options *options)
3182 {
3183 memcpy(options, &default_diff_options, sizeof(*options));
3184
3185 options->file = stdout;
3186
3187 options->line_termination = '\n';
3188 options->break_opt = -1;
3189 options->rename_limit = -1;
3190 options->dirstat_permille = diff_dirstat_permille_default;
3191 options->context = 3;
3192 DIFF_OPT_SET(options, RENAME_EMPTY);
3193
3194 options->change = diff_change;
3195 options->add_remove = diff_addremove;
3196 options->use_color = diff_use_color_default;
3197 options->detect_rename = diff_detect_rename_default;
3198
3199 if (diff_no_prefix) {
3200 options->a_prefix = options->b_prefix = "";
3201 } else if (!diff_mnemonic_prefix) {
3202 options->a_prefix = "a/";
3203 options->b_prefix = "b/";
3204 }
3205 }
3206
3207 int diff_setup_done(struct diff_options *options)
3208 {
3209 int count = 0;
3210
3211 if (options->output_format & DIFF_FORMAT_NAME)
3212 count++;
3213 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3214 count++;
3215 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3216 count++;
3217 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3218 count++;
3219 if (count > 1)
3220 die("--name-only, --name-status, --check and -s are mutually exclusive");
3221
3222 /*
3223 * Most of the time we can say "there are changes"
3224 * only by checking if there are changed paths, but
3225 * --ignore-whitespace* options force us to look
3226 * inside contents.
3227 */
3228
3229 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3230 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3231 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3232 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3233 else
3234 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3235
3236 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3237 options->detect_rename = DIFF_DETECT_COPY;
3238
3239 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3240 options->prefix = NULL;
3241 if (options->prefix)
3242 options->prefix_length = strlen(options->prefix);
3243 else
3244 options->prefix_length = 0;
3245
3246 if (options->output_format & (DIFF_FORMAT_NAME |
3247 DIFF_FORMAT_NAME_STATUS |
3248 DIFF_FORMAT_CHECKDIFF |
3249 DIFF_FORMAT_NO_OUTPUT))
3250 options->output_format &= ~(DIFF_FORMAT_RAW |
3251 DIFF_FORMAT_NUMSTAT |
3252 DIFF_FORMAT_DIFFSTAT |
3253 DIFF_FORMAT_SHORTSTAT |
3254 DIFF_FORMAT_DIRSTAT |
3255 DIFF_FORMAT_SUMMARY |
3256 DIFF_FORMAT_PATCH);
3257
3258 /*
3259 * These cases always need recursive; we do not drop caller-supplied
3260 * recursive bits for other formats here.
3261 */
3262 if (options->output_format & (DIFF_FORMAT_PATCH |
3263 DIFF_FORMAT_NUMSTAT |
3264 DIFF_FORMAT_DIFFSTAT |
3265 DIFF_FORMAT_SHORTSTAT |
3266 DIFF_FORMAT_DIRSTAT |
3267 DIFF_FORMAT_SUMMARY |
3268 DIFF_FORMAT_CHECKDIFF))
3269 DIFF_OPT_SET(options, RECURSIVE);
3270 /*
3271 * Also pickaxe would not work very well if you do not say recursive
3272 */
3273 if (options->pickaxe)
3274 DIFF_OPT_SET(options, RECURSIVE);
3275 /*
3276 * When patches are generated, submodules diffed against the work tree
3277 * must be checked for dirtiness too so it can be shown in the output
3278 */
3279 if (options->output_format & DIFF_FORMAT_PATCH)
3280 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3281
3282 if (options->detect_rename && options->rename_limit < 0)
3283 options->rename_limit = diff_rename_limit_default;
3284 if (options->setup & DIFF_SETUP_USE_CACHE) {
3285 if (!active_cache)
3286 /* read-cache does not die even when it fails
3287 * so it is safe for us to do this here. Also
3288 * it does not smudge active_cache or active_nr
3289 * when it fails, so we do not have to worry about
3290 * cleaning it up ourselves either.
3291 */
3292 read_cache();
3293 }
3294 if (options->abbrev <= 0 || 40 < options->abbrev)
3295 options->abbrev = 40; /* full */
3296
3297 /*
3298 * It does not make sense to show the first hit we happened
3299 * to have found. It does not make sense not to return with
3300 * exit code in such a case either.
3301 */
3302 if (DIFF_OPT_TST(options, QUICK)) {
3303 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3304 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3305 }
3306
3307 return 0;
3308 }
3309
3310 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3311 {
3312 char c, *eq;
3313 int len;
3314
3315 if (*arg != '-')
3316 return 0;
3317 c = *++arg;
3318 if (!c)
3319 return 0;
3320 if (c == arg_short) {
3321 c = *++arg;
3322 if (!c)
3323 return 1;
3324 if (val && isdigit(c)) {
3325 char *end;
3326 int n = strtoul(arg, &end, 10);
3327 if (*end)
3328 return 0;
3329 *val = n;
3330 return 1;
3331 }
3332 return 0;
3333 }
3334 if (c != '-')
3335 return 0;
3336 arg++;
3337 eq = strchr(arg, '=');
3338 if (eq)
3339 len = eq - arg;
3340 else
3341 len = strlen(arg);
3342 if (!len || strncmp(arg, arg_long, len))
3343 return 0;
3344 if (eq) {
3345 int n;
3346 char *end;
3347 if (!isdigit(*++eq))
3348 return 0;
3349 n = strtoul(eq, &end, 10);
3350 if (*end)
3351 return 0;
3352 *val = n;
3353 }
3354 return 1;
3355 }
3356
3357 static int diff_scoreopt_parse(const char *opt);
3358
3359 static inline int short_opt(char opt, const char **argv,
3360 const char **optarg)
3361 {
3362 const char *arg = argv[0];
3363 if (arg[0] != '-' || arg[1] != opt)
3364 return 0;
3365 if (arg[2] != '\0') {
3366 *optarg = arg + 2;
3367 return 1;
3368 }
3369 if (!argv[1])
3370 die("Option '%c' requires a value", opt);
3371 *optarg = argv[1];
3372 return 2;
3373 }
3374
3375 int parse_long_opt(const char *opt, const char **argv,
3376 const char **optarg)
3377 {
3378 const char *arg = argv[0];
3379 if (arg[0] != '-' || arg[1] != '-')
3380 return 0;
3381 arg += strlen("--");
3382 if (prefixcmp(arg, opt))
3383 return 0;
3384 arg += strlen(opt);
3385 if (*arg == '=') { /* sticked form: --option=value */
3386 *optarg = arg + 1;
3387 return 1;
3388 }
3389 if (*arg != '\0')
3390 return 0;
3391 /* separate form: --option value */
3392 if (!argv[1])
3393 die("Option '--%s' requires a value", opt);
3394 *optarg = argv[1];
3395 return 2;
3396 }
3397
3398 static int stat_opt(struct diff_options *options, const char **av)
3399 {
3400 const char *arg = av[0];
3401 char *end;
3402 int width = options->stat_width;
3403 int name_width = options->stat_name_width;
3404 int graph_width = options->stat_graph_width;
3405 int count = options->stat_count;
3406 int argcount = 1;
3407
3408 arg += strlen("--stat");
3409 end = (char *)arg;
3410
3411 switch (*arg) {
3412 case '-':
3413 if (!prefixcmp(arg, "-width")) {
3414 arg += strlen("-width");
3415 if (*arg == '=')
3416 width = strtoul(arg + 1, &end, 10);
3417 else if (!*arg && !av[1])
3418 die("Option '--stat-width' requires a value");
3419 else if (!*arg) {
3420 width = strtoul(av[1], &end, 10);
3421 argcount = 2;
3422 }
3423 } else if (!prefixcmp(arg, "-name-width")) {
3424 arg += strlen("-name-width");
3425 if (*arg == '=')
3426 name_width = strtoul(arg + 1, &end, 10);
3427 else if (!*arg && !av[1])
3428 die("Option '--stat-name-width' requires a value");
3429 else if (!*arg) {
3430 name_width = strtoul(av[1], &end, 10);
3431 argcount = 2;
3432 }
3433 } else if (!prefixcmp(arg, "-graph-width")) {
3434 arg += strlen("-graph-width");
3435 if (*arg == '=')
3436 graph_width = strtoul(arg + 1, &end, 10);
3437 else if (!*arg && !av[1])
3438 die("Option '--stat-graph-width' requires a value");
3439 else if (!*arg) {
3440 graph_width = strtoul(av[1], &end, 10);
3441 argcount = 2;
3442 }
3443 } else if (!prefixcmp(arg, "-count")) {
3444 arg += strlen("-count");
3445 if (*arg == '=')
3446 count = strtoul(arg + 1, &end, 10);
3447 else if (!*arg && !av[1])
3448 die("Option '--stat-count' requires a value");
3449 else if (!*arg) {
3450 count = strtoul(av[1], &end, 10);
3451 argcount = 2;
3452 }
3453 }
3454 break;
3455 case '=':
3456 width = strtoul(arg+1, &end, 10);
3457 if (*end == ',')
3458 name_width = strtoul(end+1, &end, 10);
3459 if (*end == ',')
3460 count = strtoul(end+1, &end, 10);
3461 }
3462
3463 /* Important! This checks all the error cases! */
3464 if (*end)
3465 return 0;
3466 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3467 options->stat_name_width = name_width;
3468 options->stat_graph_width = graph_width;
3469 options->stat_width = width;
3470 options->stat_count = count;
3471 return argcount;
3472 }
3473
3474 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3475 {
3476 struct strbuf errmsg = STRBUF_INIT;
3477 if (parse_dirstat_params(options, params, &errmsg))
3478 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3479 errmsg.buf);
3480 strbuf_release(&errmsg);
3481 /*
3482 * The caller knows a dirstat-related option is given from the command
3483 * line; allow it to say "return this_function();"
3484 */
3485 options->output_format |= DIFF_FORMAT_DIRSTAT;
3486 return 1;
3487 }
3488
3489 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3490 {
3491 const char *arg = av[0];
3492 const char *optarg;
3493 int argcount;
3494
3495 /* Output format options */
3496 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3497 options->output_format |= DIFF_FORMAT_PATCH;
3498 else if (opt_arg(arg, 'U', "unified", &options->context))
3499 options->output_format |= DIFF_FORMAT_PATCH;
3500 else if (!strcmp(arg, "--raw"))
3501 options->output_format |= DIFF_FORMAT_RAW;
3502 else if (!strcmp(arg, "--patch-with-raw"))
3503 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3504 else if (!strcmp(arg, "--numstat"))
3505 options->output_format |= DIFF_FORMAT_NUMSTAT;
3506 else if (!strcmp(arg, "--shortstat"))
3507 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3508 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3509 return parse_dirstat_opt(options, "");
3510 else if (!prefixcmp(arg, "-X"))
3511 return parse_dirstat_opt(options, arg + 2);
3512 else if (!prefixcmp(arg, "--dirstat="))
3513 return parse_dirstat_opt(options, arg + 10);
3514 else if (!strcmp(arg, "--cumulative"))
3515 return parse_dirstat_opt(options, "cumulative");
3516 else if (!strcmp(arg, "--dirstat-by-file"))
3517 return parse_dirstat_opt(options, "files");
3518 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3519 parse_dirstat_opt(options, "files");
3520 return parse_dirstat_opt(options, arg + 18);
3521 }
3522 else if (!strcmp(arg, "--check"))
3523 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3524 else if (!strcmp(arg, "--summary"))
3525 options->output_format |= DIFF_FORMAT_SUMMARY;
3526 else if (!strcmp(arg, "--patch-with-stat"))
3527 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3528 else if (!strcmp(arg, "--name-only"))
3529 options->output_format |= DIFF_FORMAT_NAME;
3530 else if (!strcmp(arg, "--name-status"))
3531 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3532 else if (!strcmp(arg, "-s"))
3533 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3534 else if (!prefixcmp(arg, "--stat"))
3535 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3536 return stat_opt(options, av);
3537
3538 /* renames options */
3539 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3540 !strcmp(arg, "--break-rewrites")) {
3541 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3542 return error("invalid argument to -B: %s", arg+2);
3543 }
3544 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3545 !strcmp(arg, "--find-renames")) {
3546 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3547 return error("invalid argument to -M: %s", arg+2);
3548 options->detect_rename = DIFF_DETECT_RENAME;
3549 }
3550 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3551 options->irreversible_delete = 1;
3552 }
3553 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3554 !strcmp(arg, "--find-copies")) {
3555 if (options->detect_rename == DIFF_DETECT_COPY)
3556 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3557 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3558 return error("invalid argument to -C: %s", arg+2);
3559 options->detect_rename = DIFF_DETECT_COPY;
3560 }
3561 else if (!strcmp(arg, "--no-renames"))
3562 options->detect_rename = 0;
3563 else if (!strcmp(arg, "--rename-empty"))
3564 DIFF_OPT_SET(options, RENAME_EMPTY);
3565 else if (!strcmp(arg, "--no-rename-empty"))
3566 DIFF_OPT_CLR(options, RENAME_EMPTY);
3567 else if (!strcmp(arg, "--relative"))
3568 DIFF_OPT_SET(options, RELATIVE_NAME);
3569 else if (!prefixcmp(arg, "--relative=")) {
3570 DIFF_OPT_SET(options, RELATIVE_NAME);
3571 options->prefix = arg + 11;
3572 }
3573
3574 /* xdiff options */
3575 else if (!strcmp(arg, "--minimal"))
3576 DIFF_XDL_SET(options, NEED_MINIMAL);
3577 else if (!strcmp(arg, "--no-minimal"))
3578 DIFF_XDL_CLR(options, NEED_MINIMAL);
3579 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3580 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3581 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3582 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3583 else if (!strcmp(arg, "--ignore-space-at-eol"))
3584 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3585 else if (!strcmp(arg, "--patience"))
3586 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3587 else if (!strcmp(arg, "--histogram"))
3588 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3589
3590 /* flags options */
3591 else if (!strcmp(arg, "--binary")) {
3592 options->output_format |= DIFF_FORMAT_PATCH;
3593 DIFF_OPT_SET(options, BINARY);
3594 }
3595 else if (!strcmp(arg, "--full-index"))
3596 DIFF_OPT_SET(options, FULL_INDEX);
3597 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3598 DIFF_OPT_SET(options, TEXT);
3599 else if (!strcmp(arg, "-R"))
3600 DIFF_OPT_SET(options, REVERSE_DIFF);
3601 else if (!strcmp(arg, "--find-copies-harder"))
3602 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3603 else if (!strcmp(arg, "--follow"))
3604 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3605 else if (!strcmp(arg, "--color"))
3606 options->use_color = 1;
3607 else if (!prefixcmp(arg, "--color=")) {
3608 int value = git_config_colorbool(NULL, arg+8);
3609 if (value < 0)
3610 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3611 options->use_color = value;
3612 }
3613 else if (!strcmp(arg, "--no-color"))
3614 options->use_color = 0;
3615 else if (!strcmp(arg, "--color-words")) {
3616 options->use_color = 1;
3617 options->word_diff = DIFF_WORDS_COLOR;
3618 }
3619 else if (!prefixcmp(arg, "--color-words=")) {
3620 options->use_color = 1;
3621 options->word_diff = DIFF_WORDS_COLOR;
3622 options->word_regex = arg + 14;
3623 }
3624 else if (!strcmp(arg, "--word-diff")) {
3625 if (options->word_diff == DIFF_WORDS_NONE)
3626 options->word_diff = DIFF_WORDS_PLAIN;
3627 }
3628 else if (!prefixcmp(arg, "--word-diff=")) {
3629 const char *type = arg + 12;
3630 if (!strcmp(type, "plain"))
3631 options->word_diff = DIFF_WORDS_PLAIN;
3632 else if (!strcmp(type, "color")) {
3633 options->use_color = 1;
3634 options->word_diff = DIFF_WORDS_COLOR;
3635 }
3636 else if (!strcmp(type, "porcelain"))
3637 options->word_diff = DIFF_WORDS_PORCELAIN;
3638 else if (!strcmp(type, "none"))
3639 options->word_diff = DIFF_WORDS_NONE;
3640 else
3641 die("bad --word-diff argument: %s", type);
3642 }
3643 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3644 if (options->word_diff == DIFF_WORDS_NONE)
3645 options->word_diff = DIFF_WORDS_PLAIN;
3646 options->word_regex = optarg;
3647 return argcount;
3648 }
3649 else if (!strcmp(arg, "--exit-code"))
3650 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3651 else if (!strcmp(arg, "--quiet"))
3652 DIFF_OPT_SET(options, QUICK);
3653 else if (!strcmp(arg, "--ext-diff"))
3654 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3655 else if (!strcmp(arg, "--no-ext-diff"))
3656 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3657 else if (!strcmp(arg, "--textconv"))
3658 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3659 else if (!strcmp(arg, "--no-textconv"))
3660 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3661 else if (!strcmp(arg, "--ignore-submodules")) {
3662 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3663 handle_ignore_submodules_arg(options, "all");
3664 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3665 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3666 handle_ignore_submodules_arg(options, arg + 20);
3667 } else if (!strcmp(arg, "--submodule"))
3668 DIFF_OPT_SET(options, SUBMODULE_LOG);
3669 else if (!prefixcmp(arg, "--submodule=")) {
3670 if (!strcmp(arg + 12, "log"))
3671 DIFF_OPT_SET(options, SUBMODULE_LOG);
3672 }
3673
3674 /* misc options */
3675 else if (!strcmp(arg, "-z"))
3676 options->line_termination = 0;
3677 else if ((argcount = short_opt('l', av, &optarg))) {
3678 options->rename_limit = strtoul(optarg, NULL, 10);
3679 return argcount;
3680 }
3681 else if ((argcount = short_opt('S', av, &optarg))) {
3682 options->pickaxe = optarg;
3683 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3684 return argcount;
3685 } else if ((argcount = short_opt('G', av, &optarg))) {
3686 options->pickaxe = optarg;
3687 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3688 return argcount;
3689 }
3690 else if (!strcmp(arg, "--pickaxe-all"))
3691 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3692 else if (!strcmp(arg, "--pickaxe-regex"))
3693 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3694 else if ((argcount = short_opt('O', av, &optarg))) {
3695 options->orderfile = optarg;
3696 return argcount;
3697 }
3698 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3699 options->filter = optarg;
3700 return argcount;
3701 }
3702 else if (!strcmp(arg, "--abbrev"))
3703 options->abbrev = DEFAULT_ABBREV;
3704 else if (!prefixcmp(arg, "--abbrev=")) {
3705 options->abbrev = strtoul(arg + 9, NULL, 10);
3706 if (options->abbrev < MINIMUM_ABBREV)
3707 options->abbrev = MINIMUM_ABBREV;
3708 else if (40 < options->abbrev)
3709 options->abbrev = 40;
3710 }
3711 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3712 options->a_prefix = optarg;
3713 return argcount;
3714 }
3715 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3716 options->b_prefix = optarg;
3717 return argcount;
3718 }
3719 else if (!strcmp(arg, "--no-prefix"))
3720 options->a_prefix = options->b_prefix = "";
3721 else if (opt_arg(arg, '\0', "inter-hunk-context",
3722 &options->interhunkcontext))
3723 ;
3724 else if (!strcmp(arg, "-W"))
3725 DIFF_OPT_SET(options, FUNCCONTEXT);
3726 else if (!strcmp(arg, "--function-context"))
3727 DIFF_OPT_SET(options, FUNCCONTEXT);
3728 else if (!strcmp(arg, "--no-function-context"))
3729 DIFF_OPT_CLR(options, FUNCCONTEXT);
3730 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3731 options->file = fopen(optarg, "w");
3732 if (!options->file)
3733 die_errno("Could not open '%s'", optarg);
3734 options->close_file = 1;
3735 return argcount;
3736 } else
3737 return 0;
3738 return 1;
3739 }
3740
3741 int parse_rename_score(const char **cp_p)
3742 {
3743 unsigned long num, scale;
3744 int ch, dot;
3745 const char *cp = *cp_p;
3746
3747 num = 0;
3748 scale = 1;
3749 dot = 0;
3750 for (;;) {
3751 ch = *cp;
3752 if ( !dot && ch == '.' ) {
3753 scale = 1;
3754 dot = 1;
3755 } else if ( ch == '%' ) {
3756 scale = dot ? scale*100 : 100;
3757 cp++; /* % is always at the end */
3758 break;
3759 } else if ( ch >= '0' && ch <= '9' ) {
3760 if ( scale < 100000 ) {
3761 scale *= 10;
3762 num = (num*10) + (ch-'0');
3763 }
3764 } else {
3765 break;
3766 }
3767 cp++;
3768 }
3769 *cp_p = cp;
3770
3771 /* user says num divided by scale and we say internally that
3772 * is MAX_SCORE * num / scale.
3773 */
3774 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3775 }
3776
3777 static int diff_scoreopt_parse(const char *opt)
3778 {
3779 int opt1, opt2, cmd;
3780
3781 if (*opt++ != '-')
3782 return -1;
3783 cmd = *opt++;
3784 if (cmd == '-') {
3785 /* convert the long-form arguments into short-form versions */
3786 if (!prefixcmp(opt, "break-rewrites")) {
3787 opt += strlen("break-rewrites");
3788 if (*opt == 0 || *opt++ == '=')
3789 cmd = 'B';
3790 } else if (!prefixcmp(opt, "find-copies")) {
3791 opt += strlen("find-copies");
3792 if (*opt == 0 || *opt++ == '=')
3793 cmd = 'C';
3794 } else if (!prefixcmp(opt, "find-renames")) {
3795 opt += strlen("find-renames");
3796 if (*opt == 0 || *opt++ == '=')
3797 cmd = 'M';
3798 }
3799 }
3800 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3801 return -1; /* that is not a -M, -C nor -B option */
3802
3803 opt1 = parse_rename_score(&opt);
3804 if (cmd != 'B')
3805 opt2 = 0;
3806 else {
3807 if (*opt == 0)
3808 opt2 = 0;
3809 else if (*opt != '/')
3810 return -1; /* we expect -B80/99 or -B80 */
3811 else {
3812 opt++;
3813 opt2 = parse_rename_score(&opt);
3814 }
3815 }
3816 if (*opt != 0)
3817 return -1;
3818 return opt1 | (opt2 << 16);
3819 }
3820
3821 struct diff_queue_struct diff_queued_diff;
3822
3823 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3824 {
3825 if (queue->alloc <= queue->nr) {
3826 queue->alloc = alloc_nr(queue->alloc);
3827 queue->queue = xrealloc(queue->queue,
3828 sizeof(dp) * queue->alloc);
3829 }
3830 queue->queue[queue->nr++] = dp;
3831 }
3832
3833 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3834 struct diff_filespec *one,
3835 struct diff_filespec *two)
3836 {
3837 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3838 dp->one = one;
3839 dp->two = two;
3840 if (queue)
3841 diff_q(queue, dp);
3842 return dp;
3843 }
3844
3845 void diff_free_filepair(struct diff_filepair *p)
3846 {
3847 free_filespec(p->one);
3848 free_filespec(p->two);
3849 free(p);
3850 }
3851
3852 /* This is different from find_unique_abbrev() in that
3853 * it stuffs the result with dots for alignment.
3854 */
3855 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3856 {
3857 int abblen;
3858 const char *abbrev;
3859 if (len == 40)
3860 return sha1_to_hex(sha1);
3861
3862 abbrev = find_unique_abbrev(sha1, len);
3863 abblen = strlen(abbrev);
3864 if (abblen < 37) {
3865 static char hex[41];
3866 if (len < abblen && abblen <= len + 2)
3867 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3868 else
3869 sprintf(hex, "%s...", abbrev);
3870 return hex;
3871 }
3872 return sha1_to_hex(sha1);
3873 }
3874
3875 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3876 {
3877 int line_termination = opt->line_termination;
3878 int inter_name_termination = line_termination ? '\t' : '\0';
3879 if (opt->output_prefix) {
3880 struct strbuf *msg = NULL;
3881 msg = opt->output_prefix(opt, opt->output_prefix_data);
3882 fprintf(opt->file, "%s", msg->buf);
3883 }
3884
3885 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3886 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3887 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3888 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3889 }
3890 if (p->score) {
3891 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3892 inter_name_termination);
3893 } else {
3894 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3895 }
3896
3897 if (p->status == DIFF_STATUS_COPIED ||
3898 p->status == DIFF_STATUS_RENAMED) {
3899 const char *name_a, *name_b;
3900 name_a = p->one->path;
3901 name_b = p->two->path;
3902 strip_prefix(opt->prefix_length, &name_a, &name_b);
3903 write_name_quoted(name_a, opt->file, inter_name_termination);
3904 write_name_quoted(name_b, opt->file, line_termination);
3905 } else {
3906 const char *name_a, *name_b;
3907 name_a = p->one->mode ? p->one->path : p->two->path;
3908 name_b = NULL;
3909 strip_prefix(opt->prefix_length, &name_a, &name_b);
3910 write_name_quoted(name_a, opt->file, line_termination);
3911 }
3912 }
3913
3914 int diff_unmodified_pair(struct diff_filepair *p)
3915 {
3916 /* This function is written stricter than necessary to support
3917 * the currently implemented transformers, but the idea is to
3918 * let transformers to produce diff_filepairs any way they want,
3919 * and filter and clean them up here before producing the output.
3920 */
3921 struct diff_filespec *one = p->one, *two = p->two;
3922
3923 if (DIFF_PAIR_UNMERGED(p))
3924 return 0; /* unmerged is interesting */
3925
3926 /* deletion, addition, mode or type change
3927 * and rename are all interesting.
3928 */
3929 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3930 DIFF_PAIR_MODE_CHANGED(p) ||
3931 strcmp(one->path, two->path))
3932 return 0;
3933
3934 /* both are valid and point at the same path. that is, we are
3935 * dealing with a change.
3936 */
3937 if (one->sha1_valid && two->sha1_valid &&
3938 !hashcmp(one->sha1, two->sha1) &&
3939 !one->dirty_submodule && !two->dirty_submodule)
3940 return 1; /* no change */
3941 if (!one->sha1_valid && !two->sha1_valid)
3942 return 1; /* both look at the same file on the filesystem. */
3943 return 0;
3944 }
3945
3946 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3947 {
3948 if (diff_unmodified_pair(p))
3949 return;
3950
3951 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3952 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3953 return; /* no tree diffs in patch format */
3954
3955 run_diff(p, o);
3956 }
3957
3958 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3959 struct diffstat_t *diffstat)
3960 {
3961 if (diff_unmodified_pair(p))
3962 return;
3963
3964 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3965 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3966 return; /* no useful stat for tree diffs */
3967
3968 run_diffstat(p, o, diffstat);
3969 }
3970
3971 static void diff_flush_checkdiff(struct diff_filepair *p,
3972 struct diff_options *o)
3973 {
3974 if (diff_unmodified_pair(p))
3975 return;
3976
3977 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3978 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3979 return; /* nothing to check in tree diffs */
3980
3981 run_checkdiff(p, o);
3982 }
3983
3984 int diff_queue_is_empty(void)
3985 {
3986 struct diff_queue_struct *q = &diff_queued_diff;
3987 int i;
3988 for (i = 0; i < q->nr; i++)
3989 if (!diff_unmodified_pair(q->queue[i]))
3990 return 0;
3991 return 1;
3992 }
3993
3994 #if DIFF_DEBUG
3995 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3996 {
3997 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3998 x, one ? one : "",
3999 s->path,
4000 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4001 s->mode,
4002 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4003 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
4004 x, one ? one : "",
4005 s->size, s->xfrm_flags);
4006 }
4007
4008 void diff_debug_filepair(const struct diff_filepair *p, int i)
4009 {
4010 diff_debug_filespec(p->one, i, "one");
4011 diff_debug_filespec(p->two, i, "two");
4012 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4013 p->score, p->status ? p->status : '?',
4014 p->one->rename_used, p->broken_pair);
4015 }
4016
4017 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4018 {
4019 int i;
4020 if (msg)
4021 fprintf(stderr, "%s\n", msg);
4022 fprintf(stderr, "q->nr = %d\n", q->nr);
4023 for (i = 0; i < q->nr; i++) {
4024 struct diff_filepair *p = q->queue[i];
4025 diff_debug_filepair(p, i);
4026 }
4027 }
4028 #endif
4029
4030 static void diff_resolve_rename_copy(void)
4031 {
4032 int i;
4033 struct diff_filepair *p;
4034 struct diff_queue_struct *q = &diff_queued_diff;
4035
4036 diff_debug_queue("resolve-rename-copy", q);
4037
4038 for (i = 0; i < q->nr; i++) {
4039 p = q->queue[i];
4040 p->status = 0; /* undecided */
4041 if (DIFF_PAIR_UNMERGED(p))
4042 p->status = DIFF_STATUS_UNMERGED;
4043 else if (!DIFF_FILE_VALID(p->one))
4044 p->status = DIFF_STATUS_ADDED;
4045 else if (!DIFF_FILE_VALID(p->two))
4046 p->status = DIFF_STATUS_DELETED;
4047 else if (DIFF_PAIR_TYPE_CHANGED(p))
4048 p->status = DIFF_STATUS_TYPE_CHANGED;
4049
4050 /* from this point on, we are dealing with a pair
4051 * whose both sides are valid and of the same type, i.e.
4052 * either in-place edit or rename/copy edit.
4053 */
4054 else if (DIFF_PAIR_RENAME(p)) {
4055 /*
4056 * A rename might have re-connected a broken
4057 * pair up, causing the pathnames to be the
4058 * same again. If so, that's not a rename at
4059 * all, just a modification..
4060 *
4061 * Otherwise, see if this source was used for
4062 * multiple renames, in which case we decrement
4063 * the count, and call it a copy.
4064 */
4065 if (!strcmp(p->one->path, p->two->path))
4066 p->status = DIFF_STATUS_MODIFIED;
4067 else if (--p->one->rename_used > 0)
4068 p->status = DIFF_STATUS_COPIED;
4069 else
4070 p->status = DIFF_STATUS_RENAMED;
4071 }
4072 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4073 p->one->mode != p->two->mode ||
4074 p->one->dirty_submodule ||
4075 p->two->dirty_submodule ||
4076 is_null_sha1(p->one->sha1))
4077 p->status = DIFF_STATUS_MODIFIED;
4078 else {
4079 /* This is a "no-change" entry and should not
4080 * happen anymore, but prepare for broken callers.
4081 */
4082 error("feeding unmodified %s to diffcore",
4083 p->one->path);
4084 p->status = DIFF_STATUS_UNKNOWN;
4085 }
4086 }
4087 diff_debug_queue("resolve-rename-copy done", q);
4088 }
4089
4090 static int check_pair_status(struct diff_filepair *p)
4091 {
4092 switch (p->status) {
4093 case DIFF_STATUS_UNKNOWN:
4094 return 0;
4095 case 0:
4096 die("internal error in diff-resolve-rename-copy");
4097 default:
4098 return 1;
4099 }
4100 }
4101
4102 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4103 {
4104 int fmt = opt->output_format;
4105
4106 if (fmt & DIFF_FORMAT_CHECKDIFF)
4107 diff_flush_checkdiff(p, opt);
4108 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4109 diff_flush_raw(p, opt);
4110 else if (fmt & DIFF_FORMAT_NAME) {
4111 const char *name_a, *name_b;
4112 name_a = p->two->path;
4113 name_b = NULL;
4114 strip_prefix(opt->prefix_length, &name_a, &name_b);
4115 write_name_quoted(name_a, opt->file, opt->line_termination);
4116 }
4117 }
4118
4119 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4120 {
4121 if (fs->mode)
4122 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4123 else
4124 fprintf(file, " %s ", newdelete);
4125 write_name_quoted(fs->path, file, '\n');
4126 }
4127
4128
4129 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4130 const char *line_prefix)
4131 {
4132 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4133 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4134 p->two->mode, show_name ? ' ' : '\n');
4135 if (show_name) {
4136 write_name_quoted(p->two->path, file, '\n');
4137 }
4138 }
4139 }
4140
4141 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4142 const char *line_prefix)
4143 {
4144 char *names = pprint_rename(p->one->path, p->two->path);
4145
4146 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4147 free(names);
4148 show_mode_change(file, p, 0, line_prefix);
4149 }
4150
4151 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4152 {
4153 FILE *file = opt->file;
4154 char *line_prefix = "";
4155
4156 if (opt->output_prefix) {
4157 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4158 line_prefix = buf->buf;
4159 }
4160
4161 switch(p->status) {
4162 case DIFF_STATUS_DELETED:
4163 fputs(line_prefix, file);
4164 show_file_mode_name(file, "delete", p->one);
4165 break;
4166 case DIFF_STATUS_ADDED:
4167 fputs(line_prefix, file);
4168 show_file_mode_name(file, "create", p->two);
4169 break;
4170 case DIFF_STATUS_COPIED:
4171 fputs(line_prefix, file);
4172 show_rename_copy(file, "copy", p, line_prefix);
4173 break;
4174 case DIFF_STATUS_RENAMED:
4175 fputs(line_prefix, file);
4176 show_rename_copy(file, "rename", p, line_prefix);
4177 break;
4178 default:
4179 if (p->score) {
4180 fprintf(file, "%s rewrite ", line_prefix);
4181 write_name_quoted(p->two->path, file, ' ');
4182 fprintf(file, "(%d%%)\n", similarity_index(p));
4183 }
4184 show_mode_change(file, p, !p->score, line_prefix);
4185 break;
4186 }
4187 }
4188
4189 struct patch_id_t {
4190 git_SHA_CTX *ctx;
4191 int patchlen;
4192 };
4193
4194 static int remove_space(char *line, int len)
4195 {
4196 int i;
4197 char *dst = line;
4198 unsigned char c;
4199
4200 for (i = 0; i < len; i++)
4201 if (!isspace((c = line[i])))
4202 *dst++ = c;
4203
4204 return dst - line;
4205 }
4206
4207 static void patch_id_consume(void *priv, char *line, unsigned long len)
4208 {
4209 struct patch_id_t *data = priv;
4210 int new_len;
4211
4212 /* Ignore line numbers when computing the SHA1 of the patch */
4213 if (!prefixcmp(line, "@@ -"))
4214 return;
4215
4216 new_len = remove_space(line, len);
4217
4218 git_SHA1_Update(data->ctx, line, new_len);
4219 data->patchlen += new_len;
4220 }
4221
4222 /* returns 0 upon success, and writes result into sha1 */
4223 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4224 {
4225 struct diff_queue_struct *q = &diff_queued_diff;
4226 int i;
4227 git_SHA_CTX ctx;
4228 struct patch_id_t data;
4229 char buffer[PATH_MAX * 4 + 20];
4230
4231 git_SHA1_Init(&ctx);
4232 memset(&data, 0, sizeof(struct patch_id_t));
4233 data.ctx = &ctx;
4234
4235 for (i = 0; i < q->nr; i++) {
4236 xpparam_t xpp;
4237 xdemitconf_t xecfg;
4238 mmfile_t mf1, mf2;
4239 struct diff_filepair *p = q->queue[i];
4240 int len1, len2;
4241
4242 memset(&xpp, 0, sizeof(xpp));
4243 memset(&xecfg, 0, sizeof(xecfg));
4244 if (p->status == 0)
4245 return error("internal diff status error");
4246 if (p->status == DIFF_STATUS_UNKNOWN)
4247 continue;
4248 if (diff_unmodified_pair(p))
4249 continue;
4250 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4251 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4252 continue;
4253 if (DIFF_PAIR_UNMERGED(p))
4254 continue;
4255
4256 diff_fill_sha1_info(p->one);
4257 diff_fill_sha1_info(p->two);
4258 if (fill_mmfile(&mf1, p->one) < 0 ||
4259 fill_mmfile(&mf2, p->two) < 0)
4260 return error("unable to read files to diff");
4261
4262 len1 = remove_space(p->one->path, strlen(p->one->path));
4263 len2 = remove_space(p->two->path, strlen(p->two->path));
4264 if (p->one->mode == 0)
4265 len1 = snprintf(buffer, sizeof(buffer),
4266 "diff--gita/%.*sb/%.*s"
4267 "newfilemode%06o"
4268 "---/dev/null"
4269 "+++b/%.*s",
4270 len1, p->one->path,
4271 len2, p->two->path,
4272 p->two->mode,
4273 len2, p->two->path);
4274 else if (p->two->mode == 0)
4275 len1 = snprintf(buffer, sizeof(buffer),
4276 "diff--gita/%.*sb/%.*s"
4277 "deletedfilemode%06o"
4278 "---a/%.*s"
4279 "+++/dev/null",
4280 len1, p->one->path,
4281 len2, p->two->path,
4282 p->one->mode,
4283 len1, p->one->path);
4284 else
4285 len1 = snprintf(buffer, sizeof(buffer),
4286 "diff--gita/%.*sb/%.*s"
4287 "---a/%.*s"
4288 "+++b/%.*s",
4289 len1, p->one->path,
4290 len2, p->two->path,
4291 len1, p->one->path,
4292 len2, p->two->path);
4293 git_SHA1_Update(&ctx, buffer, len1);
4294
4295 if (diff_filespec_is_binary(p->one) ||
4296 diff_filespec_is_binary(p->two)) {
4297 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4298 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4299 continue;
4300 }
4301
4302 xpp.flags = 0;
4303 xecfg.ctxlen = 3;
4304 xecfg.flags = 0;
4305 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4306 &xpp, &xecfg);
4307 }
4308
4309 git_SHA1_Final(sha1, &ctx);
4310 return 0;
4311 }
4312
4313 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4314 {
4315 struct diff_queue_struct *q = &diff_queued_diff;
4316 int i;
4317 int result = diff_get_patch_id(options, sha1);
4318
4319 for (i = 0; i < q->nr; i++)
4320 diff_free_filepair(q->queue[i]);
4321
4322 free(q->queue);
4323 DIFF_QUEUE_CLEAR(q);
4324
4325 return result;
4326 }
4327
4328 static int is_summary_empty(const struct diff_queue_struct *q)
4329 {
4330 int i;
4331
4332 for (i = 0; i < q->nr; i++) {
4333 const struct diff_filepair *p = q->queue[i];
4334
4335 switch (p->status) {
4336 case DIFF_STATUS_DELETED:
4337 case DIFF_STATUS_ADDED:
4338 case DIFF_STATUS_COPIED:
4339 case DIFF_STATUS_RENAMED:
4340 return 0;
4341 default:
4342 if (p->score)
4343 return 0;
4344 if (p->one->mode && p->two->mode &&
4345 p->one->mode != p->two->mode)
4346 return 0;
4347 break;
4348 }
4349 }
4350 return 1;
4351 }
4352
4353 static const char rename_limit_warning[] =
4354 "inexact rename detection was skipped due to too many files.";
4355
4356 static const char degrade_cc_to_c_warning[] =
4357 "only found copies from modified paths due to too many files.";
4358
4359 static const char rename_limit_advice[] =
4360 "you may want to set your %s variable to at least "
4361 "%d and retry the command.";
4362
4363 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4364 {
4365 if (degraded_cc)
4366 warning(degrade_cc_to_c_warning);
4367 else if (needed)
4368 warning(rename_limit_warning);
4369 else
4370 return;
4371 if (0 < needed && needed < 32767)
4372 warning(rename_limit_advice, varname, needed);
4373 }
4374
4375 void diff_flush(struct diff_options *options)
4376 {
4377 struct diff_queue_struct *q = &diff_queued_diff;
4378 int i, output_format = options->output_format;
4379 int separator = 0;
4380 int dirstat_by_line = 0;
4381
4382 /*
4383 * Order: raw, stat, summary, patch
4384 * or: name/name-status/checkdiff (other bits clear)
4385 */
4386 if (!q->nr)
4387 goto free_queue;
4388
4389 if (output_format & (DIFF_FORMAT_RAW |
4390 DIFF_FORMAT_NAME |
4391 DIFF_FORMAT_NAME_STATUS |
4392 DIFF_FORMAT_CHECKDIFF)) {
4393 for (i = 0; i < q->nr; i++) {
4394 struct diff_filepair *p = q->queue[i];
4395 if (check_pair_status(p))
4396 flush_one_pair(p, options);
4397 }
4398 separator++;
4399 }
4400
4401 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4402 dirstat_by_line = 1;
4403
4404 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4405 dirstat_by_line) {
4406 struct diffstat_t diffstat;
4407
4408 memset(&diffstat, 0, sizeof(struct diffstat_t));
4409 for (i = 0; i < q->nr; i++) {
4410 struct diff_filepair *p = q->queue[i];
4411 if (check_pair_status(p))
4412 diff_flush_stat(p, options, &diffstat);
4413 }
4414 if (output_format & DIFF_FORMAT_NUMSTAT)
4415 show_numstat(&diffstat, options);
4416 if (output_format & DIFF_FORMAT_DIFFSTAT)
4417 show_stats(&diffstat, options);
4418 if (output_format & DIFF_FORMAT_SHORTSTAT)
4419 show_shortstats(&diffstat, options);
4420 if (output_format & DIFF_FORMAT_DIRSTAT)
4421 show_dirstat_by_line(&diffstat, options);
4422 free_diffstat_info(&diffstat);
4423 separator++;
4424 }
4425 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4426 show_dirstat(options);
4427
4428 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4429 for (i = 0; i < q->nr; i++) {
4430 diff_summary(options, q->queue[i]);
4431 }
4432 separator++;
4433 }
4434
4435 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4436 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4437 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4438 /*
4439 * run diff_flush_patch for the exit status. setting
4440 * options->file to /dev/null should be safe, becaue we
4441 * aren't supposed to produce any output anyway.
4442 */
4443 if (options->close_file)
4444 fclose(options->file);
4445 options->file = fopen("/dev/null", "w");
4446 if (!options->file)
4447 die_errno("Could not open /dev/null");
4448 options->close_file = 1;
4449 for (i = 0; i < q->nr; i++) {
4450 struct diff_filepair *p = q->queue[i];
4451 if (check_pair_status(p))
4452 diff_flush_patch(p, options);
4453 if (options->found_changes)
4454 break;
4455 }
4456 }
4457
4458 if (output_format & DIFF_FORMAT_PATCH) {
4459 if (separator) {
4460 if (options->output_prefix) {
4461 struct strbuf *msg = NULL;
4462 msg = options->output_prefix(options,
4463 options->output_prefix_data);
4464 fwrite(msg->buf, msg->len, 1, stdout);
4465 }
4466 putc(options->line_termination, options->file);
4467 if (options->stat_sep) {
4468 /* attach patch instead of inline */
4469 fputs(options->stat_sep, options->file);
4470 }
4471 }
4472
4473 for (i = 0; i < q->nr; i++) {
4474 struct diff_filepair *p = q->queue[i];
4475 if (check_pair_status(p))
4476 diff_flush_patch(p, options);
4477 }
4478 }
4479
4480 if (output_format & DIFF_FORMAT_CALLBACK)
4481 options->format_callback(q, options, options->format_callback_data);
4482
4483 for (i = 0; i < q->nr; i++)
4484 diff_free_filepair(q->queue[i]);
4485 free_queue:
4486 free(q->queue);
4487 DIFF_QUEUE_CLEAR(q);
4488 if (options->close_file)
4489 fclose(options->file);
4490
4491 /*
4492 * Report the content-level differences with HAS_CHANGES;
4493 * diff_addremove/diff_change does not set the bit when
4494 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4495 */
4496 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4497 if (options->found_changes)
4498 DIFF_OPT_SET(options, HAS_CHANGES);
4499 else
4500 DIFF_OPT_CLR(options, HAS_CHANGES);
4501 }
4502 }
4503
4504 static void diffcore_apply_filter(const char *filter)
4505 {
4506 int i;
4507 struct diff_queue_struct *q = &diff_queued_diff;
4508 struct diff_queue_struct outq;
4509 DIFF_QUEUE_CLEAR(&outq);
4510
4511 if (!filter)
4512 return;
4513
4514 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4515 int found;
4516 for (i = found = 0; !found && i < q->nr; i++) {
4517 struct diff_filepair *p = q->queue[i];
4518 if (((p->status == DIFF_STATUS_MODIFIED) &&
4519 ((p->score &&
4520 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4521 (!p->score &&
4522 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4523 ((p->status != DIFF_STATUS_MODIFIED) &&
4524 strchr(filter, p->status)))
4525 found++;
4526 }
4527 if (found)
4528 return;
4529
4530 /* otherwise we will clear the whole queue
4531 * by copying the empty outq at the end of this
4532 * function, but first clear the current entries
4533 * in the queue.
4534 */
4535 for (i = 0; i < q->nr; i++)
4536 diff_free_filepair(q->queue[i]);
4537 }
4538 else {
4539 /* Only the matching ones */
4540 for (i = 0; i < q->nr; i++) {
4541 struct diff_filepair *p = q->queue[i];
4542
4543 if (((p->status == DIFF_STATUS_MODIFIED) &&
4544 ((p->score &&
4545 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4546 (!p->score &&
4547 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4548 ((p->status != DIFF_STATUS_MODIFIED) &&
4549 strchr(filter, p->status)))
4550 diff_q(&outq, p);
4551 else
4552 diff_free_filepair(p);
4553 }
4554 }
4555 free(q->queue);
4556 *q = outq;
4557 }
4558
4559 /* Check whether two filespecs with the same mode and size are identical */
4560 static int diff_filespec_is_identical(struct diff_filespec *one,
4561 struct diff_filespec *two)
4562 {
4563 if (S_ISGITLINK(one->mode))
4564 return 0;
4565 if (diff_populate_filespec(one, 0))
4566 return 0;
4567 if (diff_populate_filespec(two, 0))
4568 return 0;
4569 return !memcmp(one->data, two->data, one->size);
4570 }
4571
4572 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4573 {
4574 int i;
4575 struct diff_queue_struct *q = &diff_queued_diff;
4576 struct diff_queue_struct outq;
4577 DIFF_QUEUE_CLEAR(&outq);
4578
4579 for (i = 0; i < q->nr; i++) {
4580 struct diff_filepair *p = q->queue[i];
4581
4582 /*
4583 * 1. Entries that come from stat info dirtiness
4584 * always have both sides (iow, not create/delete),
4585 * one side of the object name is unknown, with
4586 * the same mode and size. Keep the ones that
4587 * do not match these criteria. They have real
4588 * differences.
4589 *
4590 * 2. At this point, the file is known to be modified,
4591 * with the same mode and size, and the object
4592 * name of one side is unknown. Need to inspect
4593 * the identical contents.
4594 */
4595 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4596 !DIFF_FILE_VALID(p->two) ||
4597 (p->one->sha1_valid && p->two->sha1_valid) ||
4598 (p->one->mode != p->two->mode) ||
4599 diff_populate_filespec(p->one, 1) ||
4600 diff_populate_filespec(p->two, 1) ||
4601 (p->one->size != p->two->size) ||
4602 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4603 diff_q(&outq, p);
4604 else {
4605 /*
4606 * The caller can subtract 1 from skip_stat_unmatch
4607 * to determine how many paths were dirty only
4608 * due to stat info mismatch.
4609 */
4610 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4611 diffopt->skip_stat_unmatch++;
4612 diff_free_filepair(p);
4613 }
4614 }
4615 free(q->queue);
4616 *q = outq;
4617 }
4618
4619 static int diffnamecmp(const void *a_, const void *b_)
4620 {
4621 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4622 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4623 const char *name_a, *name_b;
4624
4625 name_a = a->one ? a->one->path : a->two->path;
4626 name_b = b->one ? b->one->path : b->two->path;
4627 return strcmp(name_a, name_b);
4628 }
4629
4630 void diffcore_fix_diff_index(struct diff_options *options)
4631 {
4632 struct diff_queue_struct *q = &diff_queued_diff;
4633 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4634 }
4635
4636 void diffcore_std(struct diff_options *options)
4637 {
4638 if (options->skip_stat_unmatch)
4639 diffcore_skip_stat_unmatch(options);
4640 if (!options->found_follow) {
4641 /* See try_to_follow_renames() in tree-diff.c */
4642 if (options->break_opt != -1)
4643 diffcore_break(options->break_opt);
4644 if (options->detect_rename)
4645 diffcore_rename(options);
4646 if (options->break_opt != -1)
4647 diffcore_merge_broken();
4648 }
4649 if (options->pickaxe)
4650 diffcore_pickaxe(options);
4651 if (options->orderfile)
4652 diffcore_order(options->orderfile);
4653 if (!options->found_follow)
4654 /* See try_to_follow_renames() in tree-diff.c */
4655 diff_resolve_rename_copy();
4656 diffcore_apply_filter(options->filter);
4657
4658 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4659 DIFF_OPT_SET(options, HAS_CHANGES);
4660 else
4661 DIFF_OPT_CLR(options, HAS_CHANGES);
4662
4663 options->found_follow = 0;
4664 }
4665
4666 int diff_result_code(struct diff_options *opt, int status)
4667 {
4668 int result = 0;
4669
4670 diff_warn_rename_limit("diff.renamelimit",
4671 opt->needed_rename_limit,
4672 opt->degraded_cc_to_c);
4673 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4674 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4675 return status;
4676 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4677 DIFF_OPT_TST(opt, HAS_CHANGES))
4678 result |= 01;
4679 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4680 DIFF_OPT_TST(opt, CHECK_FAILED))
4681 result |= 02;
4682 return result;
4683 }
4684
4685 int diff_can_quit_early(struct diff_options *opt)
4686 {
4687 return (DIFF_OPT_TST(opt, QUICK) &&
4688 !opt->filter &&
4689 DIFF_OPT_TST(opt, HAS_CHANGES));
4690 }
4691
4692 /*
4693 * Shall changes to this submodule be ignored?
4694 *
4695 * Submodule changes can be configured to be ignored separately for each path,
4696 * but that configuration can be overridden from the command line.
4697 */
4698 static int is_submodule_ignored(const char *path, struct diff_options *options)
4699 {
4700 int ignored = 0;
4701 unsigned orig_flags = options->flags;
4702 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4703 set_diffopt_flags_from_submodule_config(options, path);
4704 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4705 ignored = 1;
4706 options->flags = orig_flags;
4707 return ignored;
4708 }
4709
4710 void diff_addremove(struct diff_options *options,
4711 int addremove, unsigned mode,
4712 const unsigned char *sha1,
4713 const char *concatpath, unsigned dirty_submodule)
4714 {
4715 struct diff_filespec *one, *two;
4716
4717 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4718 return;
4719
4720 /* This may look odd, but it is a preparation for
4721 * feeding "there are unchanged files which should
4722 * not produce diffs, but when you are doing copy
4723 * detection you would need them, so here they are"
4724 * entries to the diff-core. They will be prefixed
4725 * with something like '=' or '*' (I haven't decided
4726 * which but should not make any difference).
4727 * Feeding the same new and old to diff_change()
4728 * also has the same effect.
4729 * Before the final output happens, they are pruned after
4730 * merged into rename/copy pairs as appropriate.
4731 */
4732 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4733 addremove = (addremove == '+' ? '-' :
4734 addremove == '-' ? '+' : addremove);
4735
4736 if (options->prefix &&
4737 strncmp(concatpath, options->prefix, options->prefix_length))
4738 return;
4739
4740 one = alloc_filespec(concatpath);
4741 two = alloc_filespec(concatpath);
4742
4743 if (addremove != '+')
4744 fill_filespec(one, sha1, mode);
4745 if (addremove != '-') {
4746 fill_filespec(two, sha1, mode);
4747 two->dirty_submodule = dirty_submodule;
4748 }
4749
4750 diff_queue(&diff_queued_diff, one, two);
4751 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4752 DIFF_OPT_SET(options, HAS_CHANGES);
4753 }
4754
4755 void diff_change(struct diff_options *options,
4756 unsigned old_mode, unsigned new_mode,
4757 const unsigned char *old_sha1,
4758 const unsigned char *new_sha1,
4759 const char *concatpath,
4760 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4761 {
4762 struct diff_filespec *one, *two;
4763
4764 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4765 is_submodule_ignored(concatpath, options))
4766 return;
4767
4768 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4769 unsigned tmp;
4770 const unsigned char *tmp_c;
4771 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4772 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4773 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4774 new_dirty_submodule = tmp;
4775 }
4776
4777 if (options->prefix &&
4778 strncmp(concatpath, options->prefix, options->prefix_length))
4779 return;
4780
4781 one = alloc_filespec(concatpath);
4782 two = alloc_filespec(concatpath);
4783 fill_filespec(one, old_sha1, old_mode);
4784 fill_filespec(two, new_sha1, new_mode);
4785 one->dirty_submodule = old_dirty_submodule;
4786 two->dirty_submodule = new_dirty_submodule;
4787
4788 diff_queue(&diff_queued_diff, one, two);
4789 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4790 DIFF_OPT_SET(options, HAS_CHANGES);
4791 }
4792
4793 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4794 {
4795 struct diff_filepair *pair;
4796 struct diff_filespec *one, *two;
4797
4798 if (options->prefix &&
4799 strncmp(path, options->prefix, options->prefix_length))
4800 return NULL;
4801
4802 one = alloc_filespec(path);
4803 two = alloc_filespec(path);
4804 pair = diff_queue(&diff_queued_diff, one, two);
4805 pair->is_unmerged = 1;
4806 return pair;
4807 }
4808
4809 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4810 size_t *outsize)
4811 {
4812 struct diff_tempfile *temp;
4813 const char *argv[3];
4814 const char **arg = argv;
4815 struct child_process child;
4816 struct strbuf buf = STRBUF_INIT;
4817 int err = 0;
4818
4819 temp = prepare_temp_file(spec->path, spec);
4820 *arg++ = pgm;
4821 *arg++ = temp->name;
4822 *arg = NULL;
4823
4824 memset(&child, 0, sizeof(child));
4825 child.use_shell = 1;
4826 child.argv = argv;
4827 child.out = -1;
4828 if (start_command(&child)) {
4829 remove_tempfile();
4830 return NULL;
4831 }
4832
4833 if (strbuf_read(&buf, child.out, 0) < 0)
4834 err = error("error reading from textconv command '%s'", pgm);
4835 close(child.out);
4836
4837 if (finish_command(&child) || err) {
4838 strbuf_release(&buf);
4839 remove_tempfile();
4840 return NULL;
4841 }
4842 remove_tempfile();
4843
4844 return strbuf_detach(&buf, outsize);
4845 }
4846
4847 size_t fill_textconv(struct userdiff_driver *driver,
4848 struct diff_filespec *df,
4849 char **outbuf)
4850 {
4851 size_t size;
4852
4853 if (!driver || !driver->textconv) {
4854 if (!DIFF_FILE_VALID(df)) {
4855 *outbuf = "";
4856 return 0;
4857 }
4858 if (diff_populate_filespec(df, 0))
4859 die("unable to read files to diff");
4860 *outbuf = df->data;
4861 return df->size;
4862 }
4863
4864 if (driver->textconv_cache && df->sha1_valid) {
4865 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4866 &size);
4867 if (*outbuf)
4868 return size;
4869 }
4870
4871 *outbuf = run_textconv(driver->textconv, df, &size);
4872 if (!*outbuf)
4873 die("unable to read files to diff");
4874
4875 if (driver->textconv_cache && df->sha1_valid) {
4876 /* ignore errors, as we might be in a readonly repository */
4877 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4878 size);
4879 /*
4880 * we could save up changes and flush them all at the end,
4881 * but we would need an extra call after all diffing is done.
4882 * Since generating a cache entry is the slow path anyway,
4883 * this extra overhead probably isn't a big deal.
4884 */
4885 notes_cache_write(driver->textconv_cache);
4886 }
4887
4888 return size;
4889 }
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