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config: define and document exit codes
[git/dscho.git] / diff.c
blobba5f7aa2173a7494b56395bfd88ab6228b5ed1fe
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_dirstat_permille_default = 30;
35 static struct diff_options default_diff_options;
36
37 static char diff_colors[][COLOR_MAXLEN] = {
38 GIT_COLOR_RESET,
39 GIT_COLOR_NORMAL, /* PLAIN */
40 GIT_COLOR_BOLD, /* METAINFO */
41 GIT_COLOR_CYAN, /* FRAGINFO */
42 GIT_COLOR_RED, /* OLD */
43 GIT_COLOR_GREEN, /* NEW */
44 GIT_COLOR_YELLOW, /* COMMIT */
45 GIT_COLOR_BG_RED, /* WHITESPACE */
46 GIT_COLOR_NORMAL, /* FUNCINFO */
47 };
48
49 static int parse_diff_color_slot(const char *var, int ofs)
50 {
51 if (!strcasecmp(var+ofs, "plain"))
52 return DIFF_PLAIN;
53 if (!strcasecmp(var+ofs, "meta"))
54 return DIFF_METAINFO;
55 if (!strcasecmp(var+ofs, "frag"))
56 return DIFF_FRAGINFO;
57 if (!strcasecmp(var+ofs, "old"))
58 return DIFF_FILE_OLD;
59 if (!strcasecmp(var+ofs, "new"))
60 return DIFF_FILE_NEW;
61 if (!strcasecmp(var+ofs, "commit"))
62 return DIFF_COMMIT;
63 if (!strcasecmp(var+ofs, "whitespace"))
64 return DIFF_WHITESPACE;
65 if (!strcasecmp(var+ofs, "func"))
66 return DIFF_FUNCINFO;
67 return -1;
68 }
69
70 static int parse_dirstat_params(struct diff_options *options, const char *params,
71 struct strbuf *errmsg)
72 {
73 const char *p = params;
74 int p_len, ret = 0;
75
76 while (*p) {
77 p_len = strchrnul(p, ',') - p;
78 if (!memcmp(p, "changes", p_len)) {
79 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
80 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
81 } else if (!memcmp(p, "lines", p_len)) {
82 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
83 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
84 } else if (!memcmp(p, "files", p_len)) {
85 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
86 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
87 } else if (!memcmp(p, "noncumulative", p_len)) {
88 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
89 } else if (!memcmp(p, "cumulative", p_len)) {
90 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
91 } else if (isdigit(*p)) {
92 char *end;
93 int permille = strtoul(p, &end, 10) * 10;
94 if (*end == '.' && isdigit(*++end)) {
95 /* only use first digit */
96 permille += *end - '0';
97 /* .. and ignore any further digits */
98 while (isdigit(*++end))
99 ; /* nothing */
100 }
101 if (end - p == p_len)
102 options->dirstat_permille = permille;
103 else {
104 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%.*s'\n"),
105 p_len, p);
106 ret++;
107 }
108 } else {
109 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%.*s'\n"),
110 p_len, p);
111 ret++;
112 }
113
114 p += p_len;
115
116 if (*p)
117 p++; /* more parameters, swallow separator */
118 }
119 return ret;
120 }
121
122 static int git_config_rename(const char *var, const char *value)
123 {
124 if (!value)
125 return DIFF_DETECT_RENAME;
126 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
127 return DIFF_DETECT_COPY;
128 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
129 }
130
131 /*
132 * These are to give UI layer defaults.
133 * The core-level commands such as git-diff-files should
134 * never be affected by the setting of diff.renames
135 * the user happens to have in the configuration file.
136 */
137 int git_diff_ui_config(const char *var, const char *value, void *cb)
138 {
139 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
140 diff_use_color_default = git_config_colorbool(var, value, -1);
141 return 0;
142 }
143 if (!strcmp(var, "diff.renames")) {
144 diff_detect_rename_default = git_config_rename(var, value);
145 return 0;
146 }
147 if (!strcmp(var, "diff.autorefreshindex")) {
148 diff_auto_refresh_index = git_config_bool(var, value);
149 return 0;
150 }
151 if (!strcmp(var, "diff.mnemonicprefix")) {
152 diff_mnemonic_prefix = git_config_bool(var, value);
153 return 0;
154 }
155 if (!strcmp(var, "diff.noprefix")) {
156 diff_no_prefix = git_config_bool(var, value);
157 return 0;
158 }
159 if (!strcmp(var, "diff.external"))
160 return git_config_string(&external_diff_cmd_cfg, var, value);
161 if (!strcmp(var, "diff.wordregex"))
162 return git_config_string(&diff_word_regex_cfg, var, value);
163
164 if (!strcmp(var, "diff.ignoresubmodules"))
165 handle_ignore_submodules_arg(&default_diff_options, value);
166
167 return git_diff_basic_config(var, value, cb);
168 }
169
170 int git_diff_basic_config(const char *var, const char *value, void *cb)
171 {
172 if (!strcmp(var, "diff.renamelimit")) {
173 diff_rename_limit_default = git_config_int(var, value);
174 return 0;
175 }
176
177 switch (userdiff_config(var, value)) {
178 case 0: break;
179 case -1: return -1;
180 default: return 0;
181 }
182
183 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
184 int slot = parse_diff_color_slot(var, 11);
185 if (slot < 0)
186 return 0;
187 if (!value)
188 return config_error_nonbool(var);
189 color_parse(value, var, diff_colors[slot]);
190 return 0;
191 }
192
193 /* like GNU diff's --suppress-blank-empty option */
194 if (!strcmp(var, "diff.suppressblankempty") ||
195 /* for backwards compatibility */
196 !strcmp(var, "diff.suppress-blank-empty")) {
197 diff_suppress_blank_empty = git_config_bool(var, value);
198 return 0;
199 }
200
201 if (!strcmp(var, "diff.dirstat")) {
202 struct strbuf errmsg = STRBUF_INIT;
203 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
204 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
205 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
206 errmsg.buf);
207 strbuf_release(&errmsg);
208 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
209 return 0;
210 }
211
212 if (!prefixcmp(var, "submodule."))
213 return parse_submodule_config_option(var, value);
214
215 return git_color_default_config(var, value, cb);
216 }
217
218 static char *quote_two(const char *one, const char *two)
219 {
220 int need_one = quote_c_style(one, NULL, NULL, 1);
221 int need_two = quote_c_style(two, NULL, NULL, 1);
222 struct strbuf res = STRBUF_INIT;
223
224 if (need_one + need_two) {
225 strbuf_addch(&res, '"');
226 quote_c_style(one, &res, NULL, 1);
227 quote_c_style(two, &res, NULL, 1);
228 strbuf_addch(&res, '"');
229 } else {
230 strbuf_addstr(&res, one);
231 strbuf_addstr(&res, two);
232 }
233 return strbuf_detach(&res, NULL);
234 }
235
236 static const char *external_diff(void)
237 {
238 static const char *external_diff_cmd = NULL;
239 static int done_preparing = 0;
240
241 if (done_preparing)
242 return external_diff_cmd;
243 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
244 if (!external_diff_cmd)
245 external_diff_cmd = external_diff_cmd_cfg;
246 done_preparing = 1;
247 return external_diff_cmd;
248 }
249
250 static struct diff_tempfile {
251 const char *name; /* filename external diff should read from */
252 char hex[41];
253 char mode[10];
254 char tmp_path[PATH_MAX];
255 } diff_temp[2];
256
257 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
258
259 struct emit_callback {
260 int color_diff;
261 unsigned ws_rule;
262 int blank_at_eof_in_preimage;
263 int blank_at_eof_in_postimage;
264 int lno_in_preimage;
265 int lno_in_postimage;
266 sane_truncate_fn truncate;
267 const char **label_path;
268 struct diff_words_data *diff_words;
269 struct diff_options *opt;
270 int *found_changesp;
271 struct strbuf *header;
272 };
273
274 static int count_lines(const char *data, int size)
275 {
276 int count, ch, completely_empty = 1, nl_just_seen = 0;
277 count = 0;
278 while (0 < size--) {
279 ch = *data++;
280 if (ch == '\n') {
281 count++;
282 nl_just_seen = 1;
283 completely_empty = 0;
284 }
285 else {
286 nl_just_seen = 0;
287 completely_empty = 0;
288 }
289 }
290 if (completely_empty)
291 return 0;
292 if (!nl_just_seen)
293 count++; /* no trailing newline */
294 return count;
295 }
296
297 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
298 {
299 if (!DIFF_FILE_VALID(one)) {
300 mf->ptr = (char *)""; /* does not matter */
301 mf->size = 0;
302 return 0;
303 }
304 else if (diff_populate_filespec(one, 0))
305 return -1;
306
307 mf->ptr = one->data;
308 mf->size = one->size;
309 return 0;
310 }
311
312 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
313 static unsigned long diff_filespec_size(struct diff_filespec *one)
314 {
315 if (!DIFF_FILE_VALID(one))
316 return 0;
317 diff_populate_filespec(one, 1);
318 return one->size;
319 }
320
321 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
322 {
323 char *ptr = mf->ptr;
324 long size = mf->size;
325 int cnt = 0;
326
327 if (!size)
328 return cnt;
329 ptr += size - 1; /* pointing at the very end */
330 if (*ptr != '\n')
331 ; /* incomplete line */
332 else
333 ptr--; /* skip the last LF */
334 while (mf->ptr < ptr) {
335 char *prev_eol;
336 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
337 if (*prev_eol == '\n')
338 break;
339 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
340 break;
341 cnt++;
342 ptr = prev_eol - 1;
343 }
344 return cnt;
345 }
346
347 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
348 struct emit_callback *ecbdata)
349 {
350 int l1, l2, at;
351 unsigned ws_rule = ecbdata->ws_rule;
352 l1 = count_trailing_blank(mf1, ws_rule);
353 l2 = count_trailing_blank(mf2, ws_rule);
354 if (l2 <= l1) {
355 ecbdata->blank_at_eof_in_preimage = 0;
356 ecbdata->blank_at_eof_in_postimage = 0;
357 return;
358 }
359 at = count_lines(mf1->ptr, mf1->size);
360 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
361
362 at = count_lines(mf2->ptr, mf2->size);
363 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
364 }
365
366 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
367 int first, const char *line, int len)
368 {
369 int has_trailing_newline, has_trailing_carriage_return;
370 int nofirst;
371 FILE *file = o->file;
372
373 if (o->output_prefix) {
374 struct strbuf *msg = NULL;
375 msg = o->output_prefix(o, o->output_prefix_data);
376 assert(msg);
377 fwrite(msg->buf, msg->len, 1, file);
378 }
379
380 if (len == 0) {
381 has_trailing_newline = (first == '\n');
382 has_trailing_carriage_return = (!has_trailing_newline &&
383 (first == '\r'));
384 nofirst = has_trailing_newline || has_trailing_carriage_return;
385 } else {
386 has_trailing_newline = (len > 0 && line[len-1] == '\n');
387 if (has_trailing_newline)
388 len--;
389 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
390 if (has_trailing_carriage_return)
391 len--;
392 nofirst = 0;
393 }
394
395 if (len || !nofirst) {
396 fputs(set, file);
397 if (!nofirst)
398 fputc(first, file);
399 fwrite(line, len, 1, file);
400 fputs(reset, file);
401 }
402 if (has_trailing_carriage_return)
403 fputc('\r', file);
404 if (has_trailing_newline)
405 fputc('\n', file);
406 }
407
408 static void emit_line(struct diff_options *o, const char *set, const char *reset,
409 const char *line, int len)
410 {
411 emit_line_0(o, set, reset, line[0], line+1, len-1);
412 }
413
414 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
415 {
416 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
417 ecbdata->blank_at_eof_in_preimage &&
418 ecbdata->blank_at_eof_in_postimage &&
419 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
420 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
421 return 0;
422 return ws_blank_line(line, len, ecbdata->ws_rule);
423 }
424
425 static void emit_add_line(const char *reset,
426 struct emit_callback *ecbdata,
427 const char *line, int len)
428 {
429 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
430 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
431
432 if (!*ws)
433 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
434 else if (new_blank_line_at_eof(ecbdata, line, len))
435 /* Blank line at EOF - paint '+' as well */
436 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
437 else {
438 /* Emit just the prefix, then the rest. */
439 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
440 ws_check_emit(line, len, ecbdata->ws_rule,
441 ecbdata->opt->file, set, reset, ws);
442 }
443 }
444
445 static void emit_hunk_header(struct emit_callback *ecbdata,
446 const char *line, int len)
447 {
448 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
449 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
450 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
451 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
452 static const char atat[2] = { '@', '@' };
453 const char *cp, *ep;
454 struct strbuf msgbuf = STRBUF_INIT;
455 int org_len = len;
456 int i = 1;
457
458 /*
459 * As a hunk header must begin with "@@ -<old>, +<new> @@",
460 * it always is at least 10 bytes long.
461 */
462 if (len < 10 ||
463 memcmp(line, atat, 2) ||
464 !(ep = memmem(line + 2, len - 2, atat, 2))) {
465 emit_line(ecbdata->opt, plain, reset, line, len);
466 return;
467 }
468 ep += 2; /* skip over @@ */
469
470 /* The hunk header in fraginfo color */
471 strbuf_add(&msgbuf, frag, strlen(frag));
472 strbuf_add(&msgbuf, line, ep - line);
473 strbuf_add(&msgbuf, reset, strlen(reset));
474
475 /*
476 * trailing "\r\n"
477 */
478 for ( ; i < 3; i++)
479 if (line[len - i] == '\r' || line[len - i] == '\n')
480 len--;
481
482 /* blank before the func header */
483 for (cp = ep; ep - line < len; ep++)
484 if (*ep != ' ' && *ep != '\t')
485 break;
486 if (ep != cp) {
487 strbuf_add(&msgbuf, plain, strlen(plain));
488 strbuf_add(&msgbuf, cp, ep - cp);
489 strbuf_add(&msgbuf, reset, strlen(reset));
490 }
491
492 if (ep < line + len) {
493 strbuf_add(&msgbuf, func, strlen(func));
494 strbuf_add(&msgbuf, ep, line + len - ep);
495 strbuf_add(&msgbuf, reset, strlen(reset));
496 }
497
498 strbuf_add(&msgbuf, line + len, org_len - len);
499 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
500 strbuf_release(&msgbuf);
501 }
502
503 static struct diff_tempfile *claim_diff_tempfile(void) {
504 int i;
505 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
506 if (!diff_temp[i].name)
507 return diff_temp + i;
508 die("BUG: diff is failing to clean up its tempfiles");
509 }
510
511 static int remove_tempfile_installed;
512
513 static void remove_tempfile(void)
514 {
515 int i;
516 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
517 if (diff_temp[i].name == diff_temp[i].tmp_path)
518 unlink_or_warn(diff_temp[i].name);
519 diff_temp[i].name = NULL;
520 }
521 }
522
523 static void remove_tempfile_on_signal(int signo)
524 {
525 remove_tempfile();
526 sigchain_pop(signo);
527 raise(signo);
528 }
529
530 static void print_line_count(FILE *file, int count)
531 {
532 switch (count) {
533 case 0:
534 fprintf(file, "0,0");
535 break;
536 case 1:
537 fprintf(file, "1");
538 break;
539 default:
540 fprintf(file, "1,%d", count);
541 break;
542 }
543 }
544
545 static void emit_rewrite_lines(struct emit_callback *ecb,
546 int prefix, const char *data, int size)
547 {
548 const char *endp = NULL;
549 static const char *nneof = " No newline at end of file\n";
550 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
551 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
552
553 while (0 < size) {
554 int len;
555
556 endp = memchr(data, '\n', size);
557 len = endp ? (endp - data + 1) : size;
558 if (prefix != '+') {
559 ecb->lno_in_preimage++;
560 emit_line_0(ecb->opt, old, reset, '-',
561 data, len);
562 } else {
563 ecb->lno_in_postimage++;
564 emit_add_line(reset, ecb, data, len);
565 }
566 size -= len;
567 data += len;
568 }
569 if (!endp) {
570 const char *plain = diff_get_color(ecb->color_diff,
571 DIFF_PLAIN);
572 emit_line_0(ecb->opt, plain, reset, '\\',
573 nneof, strlen(nneof));
574 }
575 }
576
577 static void emit_rewrite_diff(const char *name_a,
578 const char *name_b,
579 struct diff_filespec *one,
580 struct diff_filespec *two,
581 struct userdiff_driver *textconv_one,
582 struct userdiff_driver *textconv_two,
583 struct diff_options *o)
584 {
585 int lc_a, lc_b;
586 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
587 const char *name_a_tab, *name_b_tab;
588 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
589 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
590 const char *reset = diff_get_color(color_diff, DIFF_RESET);
591 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
592 const char *a_prefix, *b_prefix;
593 char *data_one, *data_two;
594 size_t size_one, size_two;
595 struct emit_callback ecbdata;
596 char *line_prefix = "";
597 struct strbuf *msgbuf;
598
599 if (o && o->output_prefix) {
600 msgbuf = o->output_prefix(o, o->output_prefix_data);
601 line_prefix = msgbuf->buf;
602 }
603
604 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
605 a_prefix = o->b_prefix;
606 b_prefix = o->a_prefix;
607 } else {
608 a_prefix = o->a_prefix;
609 b_prefix = o->b_prefix;
610 }
611
612 name_a += (*name_a == '/');
613 name_b += (*name_b == '/');
614 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
615 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
616
617 strbuf_reset(&a_name);
618 strbuf_reset(&b_name);
619 quote_two_c_style(&a_name, a_prefix, name_a, 0);
620 quote_two_c_style(&b_name, b_prefix, name_b, 0);
621
622 size_one = fill_textconv(textconv_one, one, &data_one);
623 size_two = fill_textconv(textconv_two, two, &data_two);
624
625 memset(&ecbdata, 0, sizeof(ecbdata));
626 ecbdata.color_diff = color_diff;
627 ecbdata.found_changesp = &o->found_changes;
628 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
629 ecbdata.opt = o;
630 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
631 mmfile_t mf1, mf2;
632 mf1.ptr = (char *)data_one;
633 mf2.ptr = (char *)data_two;
634 mf1.size = size_one;
635 mf2.size = size_two;
636 check_blank_at_eof(&mf1, &mf2, &ecbdata);
637 }
638 ecbdata.lno_in_preimage = 1;
639 ecbdata.lno_in_postimage = 1;
640
641 lc_a = count_lines(data_one, size_one);
642 lc_b = count_lines(data_two, size_two);
643 fprintf(o->file,
644 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
645 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
646 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
647 line_prefix, fraginfo);
648 if (!o->irreversible_delete)
649 print_line_count(o->file, lc_a);
650 else
651 fprintf(o->file, "?,?");
652 fprintf(o->file, " +");
653 print_line_count(o->file, lc_b);
654 fprintf(o->file, " @@%s\n", reset);
655 if (lc_a && !o->irreversible_delete)
656 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
657 if (lc_b)
658 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
659 if (textconv_one)
660 free((char *)data_one);
661 if (textconv_two)
662 free((char *)data_two);
663 }
664
665 struct diff_words_buffer {
666 mmfile_t text;
667 long alloc;
668 struct diff_words_orig {
669 const char *begin, *end;
670 } *orig;
671 int orig_nr, orig_alloc;
672 };
673
674 static void diff_words_append(char *line, unsigned long len,
675 struct diff_words_buffer *buffer)
676 {
677 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
678 line++;
679 len--;
680 memcpy(buffer->text.ptr + buffer->text.size, line, len);
681 buffer->text.size += len;
682 buffer->text.ptr[buffer->text.size] = '\0';
683 }
684
685 struct diff_words_style_elem {
686 const char *prefix;
687 const char *suffix;
688 const char *color; /* NULL; filled in by the setup code if
689 * color is enabled */
690 };
691
692 struct diff_words_style {
693 enum diff_words_type type;
694 struct diff_words_style_elem new, old, ctx;
695 const char *newline;
696 };
697
698 static struct diff_words_style diff_words_styles[] = {
699 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
700 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
701 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
702 };
703
704 struct diff_words_data {
705 struct diff_words_buffer minus, plus;
706 const char *current_plus;
707 int last_minus;
708 struct diff_options *opt;
709 regex_t *word_regex;
710 enum diff_words_type type;
711 struct diff_words_style *style;
712 };
713
714 static int fn_out_diff_words_write_helper(FILE *fp,
715 struct diff_words_style_elem *st_el,
716 const char *newline,
717 size_t count, const char *buf,
718 const char *line_prefix)
719 {
720 int print = 0;
721
722 while (count) {
723 char *p = memchr(buf, '\n', count);
724 if (print)
725 fputs(line_prefix, fp);
726 if (p != buf) {
727 if (st_el->color && fputs(st_el->color, fp) < 0)
728 return -1;
729 if (fputs(st_el->prefix, fp) < 0 ||
730 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
731 fputs(st_el->suffix, fp) < 0)
732 return -1;
733 if (st_el->color && *st_el->color
734 && fputs(GIT_COLOR_RESET, fp) < 0)
735 return -1;
736 }
737 if (!p)
738 return 0;
739 if (fputs(newline, fp) < 0)
740 return -1;
741 count -= p + 1 - buf;
742 buf = p + 1;
743 print = 1;
744 }
745 return 0;
746 }
747
748 /*
749 * '--color-words' algorithm can be described as:
750 *
751 * 1. collect a the minus/plus lines of a diff hunk, divided into
752 * minus-lines and plus-lines;
753 *
754 * 2. break both minus-lines and plus-lines into words and
755 * place them into two mmfile_t with one word for each line;
756 *
757 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
758 *
759 * And for the common parts of the both file, we output the plus side text.
760 * diff_words->current_plus is used to trace the current position of the plus file
761 * which printed. diff_words->last_minus is used to trace the last minus word
762 * printed.
763 *
764 * For '--graph' to work with '--color-words', we need to output the graph prefix
765 * on each line of color words output. Generally, there are two conditions on
766 * which we should output the prefix.
767 *
768 * 1. diff_words->last_minus == 0 &&
769 * diff_words->current_plus == diff_words->plus.text.ptr
770 *
771 * that is: the plus text must start as a new line, and if there is no minus
772 * word printed, a graph prefix must be printed.
773 *
774 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
775 * *(diff_words->current_plus - 1) == '\n'
776 *
777 * that is: a graph prefix must be printed following a '\n'
778 */
779 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
780 {
781 if ((diff_words->last_minus == 0 &&
782 diff_words->current_plus == diff_words->plus.text.ptr) ||
783 (diff_words->current_plus > diff_words->plus.text.ptr &&
784 *(diff_words->current_plus - 1) == '\n')) {
785 return 1;
786 } else {
787 return 0;
788 }
789 }
790
791 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
792 {
793 struct diff_words_data *diff_words = priv;
794 struct diff_words_style *style = diff_words->style;
795 int minus_first, minus_len, plus_first, plus_len;
796 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
797 struct diff_options *opt = diff_words->opt;
798 struct strbuf *msgbuf;
799 char *line_prefix = "";
800
801 if (line[0] != '@' || parse_hunk_header(line, len,
802 &minus_first, &minus_len, &plus_first, &plus_len))
803 return;
804
805 assert(opt);
806 if (opt->output_prefix) {
807 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
808 line_prefix = msgbuf->buf;
809 }
810
811 /* POSIX requires that first be decremented by one if len == 0... */
812 if (minus_len) {
813 minus_begin = diff_words->minus.orig[minus_first].begin;
814 minus_end =
815 diff_words->minus.orig[minus_first + minus_len - 1].end;
816 } else
817 minus_begin = minus_end =
818 diff_words->minus.orig[minus_first].end;
819
820 if (plus_len) {
821 plus_begin = diff_words->plus.orig[plus_first].begin;
822 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
823 } else
824 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
825
826 if (color_words_output_graph_prefix(diff_words)) {
827 fputs(line_prefix, diff_words->opt->file);
828 }
829 if (diff_words->current_plus != plus_begin) {
830 fn_out_diff_words_write_helper(diff_words->opt->file,
831 &style->ctx, style->newline,
832 plus_begin - diff_words->current_plus,
833 diff_words->current_plus, line_prefix);
834 if (*(plus_begin - 1) == '\n')
835 fputs(line_prefix, diff_words->opt->file);
836 }
837 if (minus_begin != minus_end) {
838 fn_out_diff_words_write_helper(diff_words->opt->file,
839 &style->old, style->newline,
840 minus_end - minus_begin, minus_begin,
841 line_prefix);
842 }
843 if (plus_begin != plus_end) {
844 fn_out_diff_words_write_helper(diff_words->opt->file,
845 &style->new, style->newline,
846 plus_end - plus_begin, plus_begin,
847 line_prefix);
848 }
849
850 diff_words->current_plus = plus_end;
851 diff_words->last_minus = minus_first;
852 }
853
854 /* This function starts looking at *begin, and returns 0 iff a word was found. */
855 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
856 int *begin, int *end)
857 {
858 if (word_regex && *begin < buffer->size) {
859 regmatch_t match[1];
860 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
861 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
862 '\n', match[0].rm_eo - match[0].rm_so);
863 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
864 *begin += match[0].rm_so;
865 return *begin >= *end;
866 }
867 return -1;
868 }
869
870 /* find the next word */
871 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
872 (*begin)++;
873 if (*begin >= buffer->size)
874 return -1;
875
876 /* find the end of the word */
877 *end = *begin + 1;
878 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
879 (*end)++;
880
881 return 0;
882 }
883
884 /*
885 * This function splits the words in buffer->text, stores the list with
886 * newline separator into out, and saves the offsets of the original words
887 * in buffer->orig.
888 */
889 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
890 regex_t *word_regex)
891 {
892 int i, j;
893 long alloc = 0;
894
895 out->size = 0;
896 out->ptr = NULL;
897
898 /* fake an empty "0th" word */
899 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
900 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
901 buffer->orig_nr = 1;
902
903 for (i = 0; i < buffer->text.size; i++) {
904 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
905 return;
906
907 /* store original boundaries */
908 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
909 buffer->orig_alloc);
910 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
911 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
912 buffer->orig_nr++;
913
914 /* store one word */
915 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
916 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
917 out->ptr[out->size + j - i] = '\n';
918 out->size += j - i + 1;
919
920 i = j - 1;
921 }
922 }
923
924 /* this executes the word diff on the accumulated buffers */
925 static void diff_words_show(struct diff_words_data *diff_words)
926 {
927 xpparam_t xpp;
928 xdemitconf_t xecfg;
929 mmfile_t minus, plus;
930 struct diff_words_style *style = diff_words->style;
931
932 struct diff_options *opt = diff_words->opt;
933 struct strbuf *msgbuf;
934 char *line_prefix = "";
935
936 assert(opt);
937 if (opt->output_prefix) {
938 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
939 line_prefix = msgbuf->buf;
940 }
941
942 /* special case: only removal */
943 if (!diff_words->plus.text.size) {
944 fputs(line_prefix, diff_words->opt->file);
945 fn_out_diff_words_write_helper(diff_words->opt->file,
946 &style->old, style->newline,
947 diff_words->minus.text.size,
948 diff_words->minus.text.ptr, line_prefix);
949 diff_words->minus.text.size = 0;
950 return;
951 }
952
953 diff_words->current_plus = diff_words->plus.text.ptr;
954 diff_words->last_minus = 0;
955
956 memset(&xpp, 0, sizeof(xpp));
957 memset(&xecfg, 0, sizeof(xecfg));
958 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
959 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
960 xpp.flags = 0;
961 /* as only the hunk header will be parsed, we need a 0-context */
962 xecfg.ctxlen = 0;
963 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
964 &xpp, &xecfg);
965 free(minus.ptr);
966 free(plus.ptr);
967 if (diff_words->current_plus != diff_words->plus.text.ptr +
968 diff_words->plus.text.size) {
969 if (color_words_output_graph_prefix(diff_words))
970 fputs(line_prefix, diff_words->opt->file);
971 fn_out_diff_words_write_helper(diff_words->opt->file,
972 &style->ctx, style->newline,
973 diff_words->plus.text.ptr + diff_words->plus.text.size
974 - diff_words->current_plus, diff_words->current_plus,
975 line_prefix);
976 }
977 diff_words->minus.text.size = diff_words->plus.text.size = 0;
978 }
979
980 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
981 static void diff_words_flush(struct emit_callback *ecbdata)
982 {
983 if (ecbdata->diff_words->minus.text.size ||
984 ecbdata->diff_words->plus.text.size)
985 diff_words_show(ecbdata->diff_words);
986 }
987
988 static void free_diff_words_data(struct emit_callback *ecbdata)
989 {
990 if (ecbdata->diff_words) {
991 diff_words_flush(ecbdata);
992 free (ecbdata->diff_words->minus.text.ptr);
993 free (ecbdata->diff_words->minus.orig);
994 free (ecbdata->diff_words->plus.text.ptr);
995 free (ecbdata->diff_words->plus.orig);
996 if (ecbdata->diff_words->word_regex) {
997 regfree(ecbdata->diff_words->word_regex);
998 free(ecbdata->diff_words->word_regex);
999 }
1000 free(ecbdata->diff_words);
1001 ecbdata->diff_words = NULL;
1002 }
1003 }
1004
1005 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1006 {
1007 if (diff_use_color)
1008 return diff_colors[ix];
1009 return "";
1010 }
1011
1012 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1013 {
1014 const char *cp;
1015 unsigned long allot;
1016 size_t l = len;
1017
1018 if (ecb->truncate)
1019 return ecb->truncate(line, len);
1020 cp = line;
1021 allot = l;
1022 while (0 < l) {
1023 (void) utf8_width(&cp, &l);
1024 if (!cp)
1025 break; /* truncated in the middle? */
1026 }
1027 return allot - l;
1028 }
1029
1030 static void find_lno(const char *line, struct emit_callback *ecbdata)
1031 {
1032 const char *p;
1033 ecbdata->lno_in_preimage = 0;
1034 ecbdata->lno_in_postimage = 0;
1035 p = strchr(line, '-');
1036 if (!p)
1037 return; /* cannot happen */
1038 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1039 p = strchr(p, '+');
1040 if (!p)
1041 return; /* cannot happen */
1042 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1043 }
1044
1045 static void fn_out_consume(void *priv, char *line, unsigned long len)
1046 {
1047 struct emit_callback *ecbdata = priv;
1048 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1049 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1050 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1051 struct diff_options *o = ecbdata->opt;
1052 char *line_prefix = "";
1053 struct strbuf *msgbuf;
1054
1055 if (o && o->output_prefix) {
1056 msgbuf = o->output_prefix(o, o->output_prefix_data);
1057 line_prefix = msgbuf->buf;
1058 }
1059
1060 if (ecbdata->header) {
1061 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1062 strbuf_reset(ecbdata->header);
1063 ecbdata->header = NULL;
1064 }
1065 *(ecbdata->found_changesp) = 1;
1066
1067 if (ecbdata->label_path[0]) {
1068 const char *name_a_tab, *name_b_tab;
1069
1070 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1071 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1072
1073 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1074 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1075 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1076 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1077 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1078 }
1079
1080 if (diff_suppress_blank_empty
1081 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1082 line[0] = '\n';
1083 len = 1;
1084 }
1085
1086 if (line[0] == '@') {
1087 if (ecbdata->diff_words)
1088 diff_words_flush(ecbdata);
1089 len = sane_truncate_line(ecbdata, line, len);
1090 find_lno(line, ecbdata);
1091 emit_hunk_header(ecbdata, line, len);
1092 if (line[len-1] != '\n')
1093 putc('\n', ecbdata->opt->file);
1094 return;
1095 }
1096
1097 if (len < 1) {
1098 emit_line(ecbdata->opt, reset, reset, line, len);
1099 if (ecbdata->diff_words
1100 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1101 fputs("~\n", ecbdata->opt->file);
1102 return;
1103 }
1104
1105 if (ecbdata->diff_words) {
1106 if (line[0] == '-') {
1107 diff_words_append(line, len,
1108 &ecbdata->diff_words->minus);
1109 return;
1110 } else if (line[0] == '+') {
1111 diff_words_append(line, len,
1112 &ecbdata->diff_words->plus);
1113 return;
1114 }
1115 diff_words_flush(ecbdata);
1116 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1117 emit_line(ecbdata->opt, plain, reset, line, len);
1118 fputs("~\n", ecbdata->opt->file);
1119 } else {
1120 /* don't print the prefix character */
1121 emit_line(ecbdata->opt, plain, reset, line+1, len-1);
1122 }
1123 return;
1124 }
1125
1126 if (line[0] != '+') {
1127 const char *color =
1128 diff_get_color(ecbdata->color_diff,
1129 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1130 ecbdata->lno_in_preimage++;
1131 if (line[0] == ' ')
1132 ecbdata->lno_in_postimage++;
1133 emit_line(ecbdata->opt, color, reset, line, len);
1134 } else {
1135 ecbdata->lno_in_postimage++;
1136 emit_add_line(reset, ecbdata, line + 1, len - 1);
1137 }
1138 }
1139
1140 static char *pprint_rename(const char *a, const char *b)
1141 {
1142 const char *old = a;
1143 const char *new = b;
1144 struct strbuf name = STRBUF_INIT;
1145 int pfx_length, sfx_length;
1146 int len_a = strlen(a);
1147 int len_b = strlen(b);
1148 int a_midlen, b_midlen;
1149 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1150 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1151
1152 if (qlen_a || qlen_b) {
1153 quote_c_style(a, &name, NULL, 0);
1154 strbuf_addstr(&name, " => ");
1155 quote_c_style(b, &name, NULL, 0);
1156 return strbuf_detach(&name, NULL);
1157 }
1158
1159 /* Find common prefix */
1160 pfx_length = 0;
1161 while (*old && *new && *old == *new) {
1162 if (*old == '/')
1163 pfx_length = old - a + 1;
1164 old++;
1165 new++;
1166 }
1167
1168 /* Find common suffix */
1169 old = a + len_a;
1170 new = b + len_b;
1171 sfx_length = 0;
1172 while (a <= old && b <= new && *old == *new) {
1173 if (*old == '/')
1174 sfx_length = len_a - (old - a);
1175 old--;
1176 new--;
1177 }
1178
1179 /*
1180 * pfx{mid-a => mid-b}sfx
1181 * {pfx-a => pfx-b}sfx
1182 * pfx{sfx-a => sfx-b}
1183 * name-a => name-b
1184 */
1185 a_midlen = len_a - pfx_length - sfx_length;
1186 b_midlen = len_b - pfx_length - sfx_length;
1187 if (a_midlen < 0)
1188 a_midlen = 0;
1189 if (b_midlen < 0)
1190 b_midlen = 0;
1191
1192 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1193 if (pfx_length + sfx_length) {
1194 strbuf_add(&name, a, pfx_length);
1195 strbuf_addch(&name, '{');
1196 }
1197 strbuf_add(&name, a + pfx_length, a_midlen);
1198 strbuf_addstr(&name, " => ");
1199 strbuf_add(&name, b + pfx_length, b_midlen);
1200 if (pfx_length + sfx_length) {
1201 strbuf_addch(&name, '}');
1202 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1203 }
1204 return strbuf_detach(&name, NULL);
1205 }
1206
1207 struct diffstat_t {
1208 int nr;
1209 int alloc;
1210 struct diffstat_file {
1211 char *from_name;
1212 char *name;
1213 char *print_name;
1214 unsigned is_unmerged:1;
1215 unsigned is_binary:1;
1216 unsigned is_renamed:1;
1217 uintmax_t added, deleted;
1218 } **files;
1219 };
1220
1221 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1222 const char *name_a,
1223 const char *name_b)
1224 {
1225 struct diffstat_file *x;
1226 x = xcalloc(sizeof (*x), 1);
1227 if (diffstat->nr == diffstat->alloc) {
1228 diffstat->alloc = alloc_nr(diffstat->alloc);
1229 diffstat->files = xrealloc(diffstat->files,
1230 diffstat->alloc * sizeof(x));
1231 }
1232 diffstat->files[diffstat->nr++] = x;
1233 if (name_b) {
1234 x->from_name = xstrdup(name_a);
1235 x->name = xstrdup(name_b);
1236 x->is_renamed = 1;
1237 }
1238 else {
1239 x->from_name = NULL;
1240 x->name = xstrdup(name_a);
1241 }
1242 return x;
1243 }
1244
1245 static void diffstat_consume(void *priv, char *line, unsigned long len)
1246 {
1247 struct diffstat_t *diffstat = priv;
1248 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1249
1250 if (line[0] == '+')
1251 x->added++;
1252 else if (line[0] == '-')
1253 x->deleted++;
1254 }
1255
1256 const char mime_boundary_leader[] = "------------";
1257
1258 static int scale_linear(int it, int width, int max_change)
1259 {
1260 /*
1261 * make sure that at least one '-' is printed if there were deletions,
1262 * and likewise for '+'.
1263 */
1264 if (max_change < 2)
1265 return it;
1266 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
1267 }
1268
1269 static void show_name(FILE *file,
1270 const char *prefix, const char *name, int len)
1271 {
1272 fprintf(file, " %s%-*s |", prefix, len, name);
1273 }
1274
1275 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1276 {
1277 if (cnt <= 0)
1278 return;
1279 fprintf(file, "%s", set);
1280 while (cnt--)
1281 putc(ch, file);
1282 fprintf(file, "%s", reset);
1283 }
1284
1285 static void fill_print_name(struct diffstat_file *file)
1286 {
1287 char *pname;
1288
1289 if (file->print_name)
1290 return;
1291
1292 if (!file->is_renamed) {
1293 struct strbuf buf = STRBUF_INIT;
1294 if (quote_c_style(file->name, &buf, NULL, 0)) {
1295 pname = strbuf_detach(&buf, NULL);
1296 } else {
1297 pname = file->name;
1298 strbuf_release(&buf);
1299 }
1300 } else {
1301 pname = pprint_rename(file->from_name, file->name);
1302 }
1303 file->print_name = pname;
1304 }
1305
1306 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1307 {
1308 int i, len, add, del, adds = 0, dels = 0;
1309 uintmax_t max_change = 0, max_len = 0;
1310 int total_files = data->nr;
1311 int width, name_width;
1312 const char *reset, *add_c, *del_c;
1313 const char *line_prefix = "";
1314 struct strbuf *msg = NULL;
1315
1316 if (data->nr == 0)
1317 return;
1318
1319 if (options->output_prefix) {
1320 msg = options->output_prefix(options, options->output_prefix_data);
1321 line_prefix = msg->buf;
1322 }
1323
1324 width = options->stat_width ? options->stat_width : 80;
1325 name_width = options->stat_name_width ? options->stat_name_width : 50;
1326
1327 /* Sanity: give at least 5 columns to the graph,
1328 * but leave at least 10 columns for the name.
1329 */
1330 if (width < 25)
1331 width = 25;
1332 if (name_width < 10)
1333 name_width = 10;
1334 else if (width < name_width + 15)
1335 name_width = width - 15;
1336
1337 /* Find the longest filename and max number of changes */
1338 reset = diff_get_color_opt(options, DIFF_RESET);
1339 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1340 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1341
1342 for (i = 0; i < data->nr; i++) {
1343 struct diffstat_file *file = data->files[i];
1344 uintmax_t change = file->added + file->deleted;
1345 fill_print_name(file);
1346 len = strlen(file->print_name);
1347 if (max_len < len)
1348 max_len = len;
1349
1350 if (file->is_binary || file->is_unmerged)
1351 continue;
1352 if (max_change < change)
1353 max_change = change;
1354 }
1355
1356 /* Compute the width of the graph part;
1357 * 10 is for one blank at the beginning of the line plus
1358 * " | count " between the name and the graph.
1359 *
1360 * From here on, name_width is the width of the name area,
1361 * and width is the width of the graph area.
1362 */
1363 name_width = (name_width < max_len) ? name_width : max_len;
1364 if (width < (name_width + 10) + max_change)
1365 width = width - (name_width + 10);
1366 else
1367 width = max_change;
1368
1369 for (i = 0; i < data->nr; i++) {
1370 const char *prefix = "";
1371 char *name = data->files[i]->print_name;
1372 uintmax_t added = data->files[i]->added;
1373 uintmax_t deleted = data->files[i]->deleted;
1374 int name_len;
1375
1376 /*
1377 * "scale" the filename
1378 */
1379 len = name_width;
1380 name_len = strlen(name);
1381 if (name_width < name_len) {
1382 char *slash;
1383 prefix = "...";
1384 len -= 3;
1385 name += name_len - len;
1386 slash = strchr(name, '/');
1387 if (slash)
1388 name = slash;
1389 }
1390
1391 if (data->files[i]->is_binary) {
1392 fprintf(options->file, "%s", line_prefix);
1393 show_name(options->file, prefix, name, len);
1394 fprintf(options->file, " Bin ");
1395 fprintf(options->file, "%s%"PRIuMAX"%s",
1396 del_c, deleted, reset);
1397 fprintf(options->file, " -> ");
1398 fprintf(options->file, "%s%"PRIuMAX"%s",
1399 add_c, added, reset);
1400 fprintf(options->file, " bytes");
1401 fprintf(options->file, "\n");
1402 continue;
1403 }
1404 else if (data->files[i]->is_unmerged) {
1405 fprintf(options->file, "%s", line_prefix);
1406 show_name(options->file, prefix, name, len);
1407 fprintf(options->file, " Unmerged\n");
1408 continue;
1409 }
1410 else if (!data->files[i]->is_renamed &&
1411 (added + deleted == 0)) {
1412 total_files--;
1413 continue;
1414 }
1415
1416 /*
1417 * scale the add/delete
1418 */
1419 add = added;
1420 del = deleted;
1421 adds += add;
1422 dels += del;
1423
1424 if (width <= max_change) {
1425 add = scale_linear(add, width, max_change);
1426 del = scale_linear(del, width, max_change);
1427 }
1428 fprintf(options->file, "%s", line_prefix);
1429 show_name(options->file, prefix, name, len);
1430 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1431 added + deleted ? " " : "");
1432 show_graph(options->file, '+', add, add_c, reset);
1433 show_graph(options->file, '-', del, del_c, reset);
1434 fprintf(options->file, "\n");
1435 }
1436 fprintf(options->file, "%s", line_prefix);
1437 fprintf(options->file,
1438 " %d files changed, %d insertions(+), %d deletions(-)\n",
1439 total_files, adds, dels);
1440 }
1441
1442 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1443 {
1444 int i, adds = 0, dels = 0, total_files = data->nr;
1445
1446 if (data->nr == 0)
1447 return;
1448
1449 for (i = 0; i < data->nr; i++) {
1450 if (!data->files[i]->is_binary &&
1451 !data->files[i]->is_unmerged) {
1452 int added = data->files[i]->added;
1453 int deleted= data->files[i]->deleted;
1454 if (!data->files[i]->is_renamed &&
1455 (added + deleted == 0)) {
1456 total_files--;
1457 } else {
1458 adds += added;
1459 dels += deleted;
1460 }
1461 }
1462 }
1463 if (options->output_prefix) {
1464 struct strbuf *msg = NULL;
1465 msg = options->output_prefix(options,
1466 options->output_prefix_data);
1467 fprintf(options->file, "%s", msg->buf);
1468 }
1469 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1470 total_files, adds, dels);
1471 }
1472
1473 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1474 {
1475 int i;
1476
1477 if (data->nr == 0)
1478 return;
1479
1480 for (i = 0; i < data->nr; i++) {
1481 struct diffstat_file *file = data->files[i];
1482
1483 if (options->output_prefix) {
1484 struct strbuf *msg = NULL;
1485 msg = options->output_prefix(options,
1486 options->output_prefix_data);
1487 fprintf(options->file, "%s", msg->buf);
1488 }
1489
1490 if (file->is_binary)
1491 fprintf(options->file, "-\t-\t");
1492 else
1493 fprintf(options->file,
1494 "%"PRIuMAX"\t%"PRIuMAX"\t",
1495 file->added, file->deleted);
1496 if (options->line_termination) {
1497 fill_print_name(file);
1498 if (!file->is_renamed)
1499 write_name_quoted(file->name, options->file,
1500 options->line_termination);
1501 else {
1502 fputs(file->print_name, options->file);
1503 putc(options->line_termination, options->file);
1504 }
1505 } else {
1506 if (file->is_renamed) {
1507 putc('\0', options->file);
1508 write_name_quoted(file->from_name, options->file, '\0');
1509 }
1510 write_name_quoted(file->name, options->file, '\0');
1511 }
1512 }
1513 }
1514
1515 struct dirstat_file {
1516 const char *name;
1517 unsigned long changed;
1518 };
1519
1520 struct dirstat_dir {
1521 struct dirstat_file *files;
1522 int alloc, nr, permille, cumulative;
1523 };
1524
1525 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1526 unsigned long changed, const char *base, int baselen)
1527 {
1528 unsigned long this_dir = 0;
1529 unsigned int sources = 0;
1530 const char *line_prefix = "";
1531 struct strbuf *msg = NULL;
1532
1533 if (opt->output_prefix) {
1534 msg = opt->output_prefix(opt, opt->output_prefix_data);
1535 line_prefix = msg->buf;
1536 }
1537
1538 while (dir->nr) {
1539 struct dirstat_file *f = dir->files;
1540 int namelen = strlen(f->name);
1541 unsigned long this;
1542 char *slash;
1543
1544 if (namelen < baselen)
1545 break;
1546 if (memcmp(f->name, base, baselen))
1547 break;
1548 slash = strchr(f->name + baselen, '/');
1549 if (slash) {
1550 int newbaselen = slash + 1 - f->name;
1551 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1552 sources++;
1553 } else {
1554 this = f->changed;
1555 dir->files++;
1556 dir->nr--;
1557 sources += 2;
1558 }
1559 this_dir += this;
1560 }
1561
1562 /*
1563 * We don't report dirstat's for
1564 * - the top level
1565 * - or cases where everything came from a single directory
1566 * under this directory (sources == 1).
1567 */
1568 if (baselen && sources != 1) {
1569 if (this_dir) {
1570 int permille = this_dir * 1000 / changed;
1571 if (permille >= dir->permille) {
1572 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1573 permille / 10, permille % 10, baselen, base);
1574 if (!dir->cumulative)
1575 return 0;
1576 }
1577 }
1578 }
1579 return this_dir;
1580 }
1581
1582 static int dirstat_compare(const void *_a, const void *_b)
1583 {
1584 const struct dirstat_file *a = _a;
1585 const struct dirstat_file *b = _b;
1586 return strcmp(a->name, b->name);
1587 }
1588
1589 static void show_dirstat(struct diff_options *options)
1590 {
1591 int i;
1592 unsigned long changed;
1593 struct dirstat_dir dir;
1594 struct diff_queue_struct *q = &diff_queued_diff;
1595
1596 dir.files = NULL;
1597 dir.alloc = 0;
1598 dir.nr = 0;
1599 dir.permille = options->dirstat_permille;
1600 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1601
1602 changed = 0;
1603 for (i = 0; i < q->nr; i++) {
1604 struct diff_filepair *p = q->queue[i];
1605 const char *name;
1606 unsigned long copied, added, damage;
1607 int content_changed;
1608
1609 name = p->two->path ? p->two->path : p->one->path;
1610
1611 if (p->one->sha1_valid && p->two->sha1_valid)
1612 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1613 else
1614 content_changed = 1;
1615
1616 if (!content_changed) {
1617 /*
1618 * The SHA1 has not changed, so pre-/post-content is
1619 * identical. We can therefore skip looking at the
1620 * file contents altogether.
1621 */
1622 damage = 0;
1623 goto found_damage;
1624 }
1625
1626 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1627 /*
1628 * In --dirstat-by-file mode, we don't really need to
1629 * look at the actual file contents at all.
1630 * The fact that the SHA1 changed is enough for us to
1631 * add this file to the list of results
1632 * (with each file contributing equal damage).
1633 */
1634 damage = 1;
1635 goto found_damage;
1636 }
1637
1638 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1639 diff_populate_filespec(p->one, 0);
1640 diff_populate_filespec(p->two, 0);
1641 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1642 &copied, &added);
1643 diff_free_filespec_data(p->one);
1644 diff_free_filespec_data(p->two);
1645 } else if (DIFF_FILE_VALID(p->one)) {
1646 diff_populate_filespec(p->one, 1);
1647 copied = added = 0;
1648 diff_free_filespec_data(p->one);
1649 } else if (DIFF_FILE_VALID(p->two)) {
1650 diff_populate_filespec(p->two, 1);
1651 copied = 0;
1652 added = p->two->size;
1653 diff_free_filespec_data(p->two);
1654 } else
1655 continue;
1656
1657 /*
1658 * Original minus copied is the removed material,
1659 * added is the new material. They are both damages
1660 * made to the preimage.
1661 * If the resulting damage is zero, we know that
1662 * diffcore_count_changes() considers the two entries to
1663 * be identical, but since content_changed is true, we
1664 * know that there must have been _some_ kind of change,
1665 * so we force all entries to have damage > 0.
1666 */
1667 damage = (p->one->size - copied) + added;
1668 if (!damage)
1669 damage = 1;
1670
1671 found_damage:
1672 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1673 dir.files[dir.nr].name = name;
1674 dir.files[dir.nr].changed = damage;
1675 changed += damage;
1676 dir.nr++;
1677 }
1678
1679 /* This can happen even with many files, if everything was renames */
1680 if (!changed)
1681 return;
1682
1683 /* Show all directories with more than x% of the changes */
1684 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1685 gather_dirstat(options, &dir, changed, "", 0);
1686 }
1687
1688 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1689 {
1690 int i;
1691 unsigned long changed;
1692 struct dirstat_dir dir;
1693
1694 if (data->nr == 0)
1695 return;
1696
1697 dir.files = NULL;
1698 dir.alloc = 0;
1699 dir.nr = 0;
1700 dir.permille = options->dirstat_permille;
1701 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1702
1703 changed = 0;
1704 for (i = 0; i < data->nr; i++) {
1705 struct diffstat_file *file = data->files[i];
1706 unsigned long damage = file->added + file->deleted;
1707 if (file->is_binary)
1708 /*
1709 * binary files counts bytes, not lines. Must find some
1710 * way to normalize binary bytes vs. textual lines.
1711 * The following heuristic assumes that there are 64
1712 * bytes per "line".
1713 * This is stupid and ugly, but very cheap...
1714 */
1715 damage = (damage + 63) / 64;
1716 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1717 dir.files[dir.nr].name = file->name;
1718 dir.files[dir.nr].changed = damage;
1719 changed += damage;
1720 dir.nr++;
1721 }
1722
1723 /* This can happen even with many files, if everything was renames */
1724 if (!changed)
1725 return;
1726
1727 /* Show all directories with more than x% of the changes */
1728 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1729 gather_dirstat(options, &dir, changed, "", 0);
1730 }
1731
1732 static void free_diffstat_info(struct diffstat_t *diffstat)
1733 {
1734 int i;
1735 for (i = 0; i < diffstat->nr; i++) {
1736 struct diffstat_file *f = diffstat->files[i];
1737 if (f->name != f->print_name)
1738 free(f->print_name);
1739 free(f->name);
1740 free(f->from_name);
1741 free(f);
1742 }
1743 free(diffstat->files);
1744 }
1745
1746 struct checkdiff_t {
1747 const char *filename;
1748 int lineno;
1749 int conflict_marker_size;
1750 struct diff_options *o;
1751 unsigned ws_rule;
1752 unsigned status;
1753 };
1754
1755 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1756 {
1757 char firstchar;
1758 int cnt;
1759
1760 if (len < marker_size + 1)
1761 return 0;
1762 firstchar = line[0];
1763 switch (firstchar) {
1764 case '=': case '>': case '<': case '|':
1765 break;
1766 default:
1767 return 0;
1768 }
1769 for (cnt = 1; cnt < marker_size; cnt++)
1770 if (line[cnt] != firstchar)
1771 return 0;
1772 /* line[1] thru line[marker_size-1] are same as firstchar */
1773 if (len < marker_size + 1 || !isspace(line[marker_size]))
1774 return 0;
1775 return 1;
1776 }
1777
1778 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1779 {
1780 struct checkdiff_t *data = priv;
1781 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1782 int marker_size = data->conflict_marker_size;
1783 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1784 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1785 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1786 char *err;
1787 char *line_prefix = "";
1788 struct strbuf *msgbuf;
1789
1790 assert(data->o);
1791 if (data->o->output_prefix) {
1792 msgbuf = data->o->output_prefix(data->o,
1793 data->o->output_prefix_data);
1794 line_prefix = msgbuf->buf;
1795 }
1796
1797 if (line[0] == '+') {
1798 unsigned bad;
1799 data->lineno++;
1800 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1801 data->status |= 1;
1802 fprintf(data->o->file,
1803 "%s%s:%d: leftover conflict marker\n",
1804 line_prefix, data->filename, data->lineno);
1805 }
1806 bad = ws_check(line + 1, len - 1, data->ws_rule);
1807 if (!bad)
1808 return;
1809 data->status |= bad;
1810 err = whitespace_error_string(bad);
1811 fprintf(data->o->file, "%s%s:%d: %s.\n",
1812 line_prefix, data->filename, data->lineno, err);
1813 free(err);
1814 emit_line(data->o, set, reset, line, 1);
1815 ws_check_emit(line + 1, len - 1, data->ws_rule,
1816 data->o->file, set, reset, ws);
1817 } else if (line[0] == ' ') {
1818 data->lineno++;
1819 } else if (line[0] == '@') {
1820 char *plus = strchr(line, '+');
1821 if (plus)
1822 data->lineno = strtol(plus, NULL, 10) - 1;
1823 else
1824 die("invalid diff");
1825 }
1826 }
1827
1828 static unsigned char *deflate_it(char *data,
1829 unsigned long size,
1830 unsigned long *result_size)
1831 {
1832 int bound;
1833 unsigned char *deflated;
1834 z_stream stream;
1835
1836 memset(&stream, 0, sizeof(stream));
1837 deflateInit(&stream, zlib_compression_level);
1838 bound = deflateBound(&stream, size);
1839 deflated = xmalloc(bound);
1840 stream.next_out = deflated;
1841 stream.avail_out = bound;
1842
1843 stream.next_in = (unsigned char *)data;
1844 stream.avail_in = size;
1845 while (deflate(&stream, Z_FINISH) == Z_OK)
1846 ; /* nothing */
1847 deflateEnd(&stream);
1848 *result_size = stream.total_out;
1849 return deflated;
1850 }
1851
1852 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1853 {
1854 void *cp;
1855 void *delta;
1856 void *deflated;
1857 void *data;
1858 unsigned long orig_size;
1859 unsigned long delta_size;
1860 unsigned long deflate_size;
1861 unsigned long data_size;
1862
1863 /* We could do deflated delta, or we could do just deflated two,
1864 * whichever is smaller.
1865 */
1866 delta = NULL;
1867 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1868 if (one->size && two->size) {
1869 delta = diff_delta(one->ptr, one->size,
1870 two->ptr, two->size,
1871 &delta_size, deflate_size);
1872 if (delta) {
1873 void *to_free = delta;
1874 orig_size = delta_size;
1875 delta = deflate_it(delta, delta_size, &delta_size);
1876 free(to_free);
1877 }
1878 }
1879
1880 if (delta && delta_size < deflate_size) {
1881 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1882 free(deflated);
1883 data = delta;
1884 data_size = delta_size;
1885 }
1886 else {
1887 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1888 free(delta);
1889 data = deflated;
1890 data_size = deflate_size;
1891 }
1892
1893 /* emit data encoded in base85 */
1894 cp = data;
1895 while (data_size) {
1896 int bytes = (52 < data_size) ? 52 : data_size;
1897 char line[70];
1898 data_size -= bytes;
1899 if (bytes <= 26)
1900 line[0] = bytes + 'A' - 1;
1901 else
1902 line[0] = bytes - 26 + 'a' - 1;
1903 encode_85(line + 1, cp, bytes);
1904 cp = (char *) cp + bytes;
1905 fprintf(file, "%s", prefix);
1906 fputs(line, file);
1907 fputc('\n', file);
1908 }
1909 fprintf(file, "%s\n", prefix);
1910 free(data);
1911 }
1912
1913 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1914 {
1915 fprintf(file, "%sGIT binary patch\n", prefix);
1916 emit_binary_diff_body(file, one, two, prefix);
1917 emit_binary_diff_body(file, two, one, prefix);
1918 }
1919
1920 static void diff_filespec_load_driver(struct diff_filespec *one)
1921 {
1922 /* Use already-loaded driver */
1923 if (one->driver)
1924 return;
1925
1926 if (S_ISREG(one->mode))
1927 one->driver = userdiff_find_by_path(one->path);
1928
1929 /* Fallback to default settings */
1930 if (!one->driver)
1931 one->driver = userdiff_find_by_name("default");
1932 }
1933
1934 int diff_filespec_is_binary(struct diff_filespec *one)
1935 {
1936 if (one->is_binary == -1) {
1937 diff_filespec_load_driver(one);
1938 if (one->driver->binary != -1)
1939 one->is_binary = one->driver->binary;
1940 else {
1941 if (!one->data && DIFF_FILE_VALID(one))
1942 diff_populate_filespec(one, 0);
1943 if (one->data)
1944 one->is_binary = buffer_is_binary(one->data,
1945 one->size);
1946 if (one->is_binary == -1)
1947 one->is_binary = 0;
1948 }
1949 }
1950 return one->is_binary;
1951 }
1952
1953 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1954 {
1955 diff_filespec_load_driver(one);
1956 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1957 }
1958
1959 static const char *userdiff_word_regex(struct diff_filespec *one)
1960 {
1961 diff_filespec_load_driver(one);
1962 return one->driver->word_regex;
1963 }
1964
1965 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1966 {
1967 if (!options->a_prefix)
1968 options->a_prefix = a;
1969 if (!options->b_prefix)
1970 options->b_prefix = b;
1971 }
1972
1973 struct userdiff_driver *get_textconv(struct diff_filespec *one)
1974 {
1975 if (!DIFF_FILE_VALID(one))
1976 return NULL;
1977
1978 diff_filespec_load_driver(one);
1979 if (!one->driver->textconv)
1980 return NULL;
1981
1982 if (one->driver->textconv_want_cache && !one->driver->textconv_cache) {
1983 struct notes_cache *c = xmalloc(sizeof(*c));
1984 struct strbuf name = STRBUF_INIT;
1985
1986 strbuf_addf(&name, "textconv/%s", one->driver->name);
1987 notes_cache_init(c, name.buf, one->driver->textconv);
1988 one->driver->textconv_cache = c;
1989 }
1990
1991 return one->driver;
1992 }
1993
1994 static void builtin_diff(const char *name_a,
1995 const char *name_b,
1996 struct diff_filespec *one,
1997 struct diff_filespec *two,
1998 const char *xfrm_msg,
1999 int must_show_header,
2000 struct diff_options *o,
2001 int complete_rewrite)
2002 {
2003 mmfile_t mf1, mf2;
2004 const char *lbl[2];
2005 char *a_one, *b_two;
2006 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2007 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2008 const char *a_prefix, *b_prefix;
2009 struct userdiff_driver *textconv_one = NULL;
2010 struct userdiff_driver *textconv_two = NULL;
2011 struct strbuf header = STRBUF_INIT;
2012 struct strbuf *msgbuf;
2013 char *line_prefix = "";
2014
2015 if (o->output_prefix) {
2016 msgbuf = o->output_prefix(o, o->output_prefix_data);
2017 line_prefix = msgbuf->buf;
2018 }
2019
2020 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2021 (!one->mode || S_ISGITLINK(one->mode)) &&
2022 (!two->mode || S_ISGITLINK(two->mode))) {
2023 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2024 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2025 show_submodule_summary(o->file, one ? one->path : two->path,
2026 one->sha1, two->sha1, two->dirty_submodule,
2027 del, add, reset);
2028 return;
2029 }
2030
2031 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2032 textconv_one = get_textconv(one);
2033 textconv_two = get_textconv(two);
2034 }
2035
2036 diff_set_mnemonic_prefix(o, "a/", "b/");
2037 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2038 a_prefix = o->b_prefix;
2039 b_prefix = o->a_prefix;
2040 } else {
2041 a_prefix = o->a_prefix;
2042 b_prefix = o->b_prefix;
2043 }
2044
2045 /* Never use a non-valid filename anywhere if at all possible */
2046 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2047 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2048
2049 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2050 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2051 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2052 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2053 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2054 if (lbl[0][0] == '/') {
2055 /* /dev/null */
2056 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2057 if (xfrm_msg)
2058 strbuf_addstr(&header, xfrm_msg);
2059 must_show_header = 1;
2060 }
2061 else if (lbl[1][0] == '/') {
2062 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2063 if (xfrm_msg)
2064 strbuf_addstr(&header, xfrm_msg);
2065 must_show_header = 1;
2066 }
2067 else {
2068 if (one->mode != two->mode) {
2069 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2070 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2071 must_show_header = 1;
2072 }
2073 if (xfrm_msg)
2074 strbuf_addstr(&header, xfrm_msg);
2075
2076 /*
2077 * we do not run diff between different kind
2078 * of objects.
2079 */
2080 if ((one->mode ^ two->mode) & S_IFMT)
2081 goto free_ab_and_return;
2082 if (complete_rewrite &&
2083 (textconv_one || !diff_filespec_is_binary(one)) &&
2084 (textconv_two || !diff_filespec_is_binary(two))) {
2085 fprintf(o->file, "%s", header.buf);
2086 strbuf_reset(&header);
2087 emit_rewrite_diff(name_a, name_b, one, two,
2088 textconv_one, textconv_two, o);
2089 o->found_changes = 1;
2090 goto free_ab_and_return;
2091 }
2092 }
2093
2094 if (o->irreversible_delete && lbl[1][0] == '/') {
2095 fprintf(o->file, "%s", header.buf);
2096 strbuf_reset(&header);
2097 goto free_ab_and_return;
2098 } else if (!DIFF_OPT_TST(o, TEXT) &&
2099 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2100 (!textconv_two && diff_filespec_is_binary(two)) )) {
2101 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2102 die("unable to read files to diff");
2103 /* Quite common confusing case */
2104 if (mf1.size == mf2.size &&
2105 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2106 if (must_show_header)
2107 fprintf(o->file, "%s", header.buf);
2108 goto free_ab_and_return;
2109 }
2110 fprintf(o->file, "%s", header.buf);
2111 strbuf_reset(&header);
2112 if (DIFF_OPT_TST(o, BINARY))
2113 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2114 else
2115 fprintf(o->file, "%sBinary files %s and %s differ\n",
2116 line_prefix, lbl[0], lbl[1]);
2117 o->found_changes = 1;
2118 } else {
2119 /* Crazy xdl interfaces.. */
2120 const char *diffopts = getenv("GIT_DIFF_OPTS");
2121 xpparam_t xpp;
2122 xdemitconf_t xecfg;
2123 struct emit_callback ecbdata;
2124 const struct userdiff_funcname *pe;
2125
2126 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
2127 fprintf(o->file, "%s", header.buf);
2128 strbuf_reset(&header);
2129 }
2130
2131 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2132 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2133
2134 pe = diff_funcname_pattern(one);
2135 if (!pe)
2136 pe = diff_funcname_pattern(two);
2137
2138 memset(&xpp, 0, sizeof(xpp));
2139 memset(&xecfg, 0, sizeof(xecfg));
2140 memset(&ecbdata, 0, sizeof(ecbdata));
2141 ecbdata.label_path = lbl;
2142 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
2143 ecbdata.found_changesp = &o->found_changes;
2144 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2145 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2146 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2147 ecbdata.opt = o;
2148 ecbdata.header = header.len ? &header : NULL;
2149 xpp.flags = o->xdl_opts;
2150 xecfg.ctxlen = o->context;
2151 xecfg.interhunkctxlen = o->interhunkcontext;
2152 xecfg.flags = XDL_EMIT_FUNCNAMES;
2153 if (pe)
2154 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2155 if (!diffopts)
2156 ;
2157 else if (!prefixcmp(diffopts, "--unified="))
2158 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2159 else if (!prefixcmp(diffopts, "-u"))
2160 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2161 if (o->word_diff) {
2162 int i;
2163
2164 ecbdata.diff_words =
2165 xcalloc(1, sizeof(struct diff_words_data));
2166 ecbdata.diff_words->type = o->word_diff;
2167 ecbdata.diff_words->opt = o;
2168 if (!o->word_regex)
2169 o->word_regex = userdiff_word_regex(one);
2170 if (!o->word_regex)
2171 o->word_regex = userdiff_word_regex(two);
2172 if (!o->word_regex)
2173 o->word_regex = diff_word_regex_cfg;
2174 if (o->word_regex) {
2175 ecbdata.diff_words->word_regex = (regex_t *)
2176 xmalloc(sizeof(regex_t));
2177 if (regcomp(ecbdata.diff_words->word_regex,
2178 o->word_regex,
2179 REG_EXTENDED | REG_NEWLINE))
2180 die ("Invalid regular expression: %s",
2181 o->word_regex);
2182 }
2183 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2184 if (o->word_diff == diff_words_styles[i].type) {
2185 ecbdata.diff_words->style =
2186 &diff_words_styles[i];
2187 break;
2188 }
2189 }
2190 if (DIFF_OPT_TST(o, COLOR_DIFF)) {
2191 struct diff_words_style *st = ecbdata.diff_words->style;
2192 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2193 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2194 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2195 }
2196 }
2197 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2198 &xpp, &xecfg);
2199 if (o->word_diff)
2200 free_diff_words_data(&ecbdata);
2201 if (textconv_one)
2202 free(mf1.ptr);
2203 if (textconv_two)
2204 free(mf2.ptr);
2205 xdiff_clear_find_func(&xecfg);
2206 }
2207
2208 free_ab_and_return:
2209 strbuf_release(&header);
2210 diff_free_filespec_data(one);
2211 diff_free_filespec_data(two);
2212 free(a_one);
2213 free(b_two);
2214 return;
2215 }
2216
2217 static void builtin_diffstat(const char *name_a, const char *name_b,
2218 struct diff_filespec *one,
2219 struct diff_filespec *two,
2220 struct diffstat_t *diffstat,
2221 struct diff_options *o,
2222 int complete_rewrite)
2223 {
2224 mmfile_t mf1, mf2;
2225 struct diffstat_file *data;
2226
2227 data = diffstat_add(diffstat, name_a, name_b);
2228
2229 if (!one || !two) {
2230 data->is_unmerged = 1;
2231 return;
2232 }
2233
2234 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2235 data->is_binary = 1;
2236 data->added = diff_filespec_size(two);
2237 data->deleted = diff_filespec_size(one);
2238 }
2239
2240 else if (complete_rewrite) {
2241 diff_populate_filespec(one, 0);
2242 diff_populate_filespec(two, 0);
2243 data->deleted = count_lines(one->data, one->size);
2244 data->added = count_lines(two->data, two->size);
2245 }
2246
2247 else {
2248 /* Crazy xdl interfaces.. */
2249 xpparam_t xpp;
2250 xdemitconf_t xecfg;
2251
2252 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2253 die("unable to read files to diff");
2254
2255 memset(&xpp, 0, sizeof(xpp));
2256 memset(&xecfg, 0, sizeof(xecfg));
2257 xpp.flags = o->xdl_opts;
2258 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2259 &xpp, &xecfg);
2260 }
2261
2262 diff_free_filespec_data(one);
2263 diff_free_filespec_data(two);
2264 }
2265
2266 static void builtin_checkdiff(const char *name_a, const char *name_b,
2267 const char *attr_path,
2268 struct diff_filespec *one,
2269 struct diff_filespec *two,
2270 struct diff_options *o)
2271 {
2272 mmfile_t mf1, mf2;
2273 struct checkdiff_t data;
2274
2275 if (!two)
2276 return;
2277
2278 memset(&data, 0, sizeof(data));
2279 data.filename = name_b ? name_b : name_a;
2280 data.lineno = 0;
2281 data.o = o;
2282 data.ws_rule = whitespace_rule(attr_path);
2283 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2284
2285 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2286 die("unable to read files to diff");
2287
2288 /*
2289 * All the other codepaths check both sides, but not checking
2290 * the "old" side here is deliberate. We are checking the newly
2291 * introduced changes, and as long as the "new" side is text, we
2292 * can and should check what it introduces.
2293 */
2294 if (diff_filespec_is_binary(two))
2295 goto free_and_return;
2296 else {
2297 /* Crazy xdl interfaces.. */
2298 xpparam_t xpp;
2299 xdemitconf_t xecfg;
2300
2301 memset(&xpp, 0, sizeof(xpp));
2302 memset(&xecfg, 0, sizeof(xecfg));
2303 xecfg.ctxlen = 1; /* at least one context line */
2304 xpp.flags = 0;
2305 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2306 &xpp, &xecfg);
2307
2308 if (data.ws_rule & WS_BLANK_AT_EOF) {
2309 struct emit_callback ecbdata;
2310 int blank_at_eof;
2311
2312 ecbdata.ws_rule = data.ws_rule;
2313 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2314 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2315
2316 if (blank_at_eof) {
2317 static char *err;
2318 if (!err)
2319 err = whitespace_error_string(WS_BLANK_AT_EOF);
2320 fprintf(o->file, "%s:%d: %s.\n",
2321 data.filename, blank_at_eof, err);
2322 data.status = 1; /* report errors */
2323 }
2324 }
2325 }
2326 free_and_return:
2327 diff_free_filespec_data(one);
2328 diff_free_filespec_data(two);
2329 if (data.status)
2330 DIFF_OPT_SET(o, CHECK_FAILED);
2331 }
2332
2333 struct diff_filespec *alloc_filespec(const char *path)
2334 {
2335 int namelen = strlen(path);
2336 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2337
2338 memset(spec, 0, sizeof(*spec));
2339 spec->path = (char *)(spec + 1);
2340 memcpy(spec->path, path, namelen+1);
2341 spec->count = 1;
2342 spec->is_binary = -1;
2343 return spec;
2344 }
2345
2346 void free_filespec(struct diff_filespec *spec)
2347 {
2348 if (!--spec->count) {
2349 diff_free_filespec_data(spec);
2350 free(spec);
2351 }
2352 }
2353
2354 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2355 unsigned short mode)
2356 {
2357 if (mode) {
2358 spec->mode = canon_mode(mode);
2359 hashcpy(spec->sha1, sha1);
2360 spec->sha1_valid = !is_null_sha1(sha1);
2361 }
2362 }
2363
2364 /*
2365 * Given a name and sha1 pair, if the index tells us the file in
2366 * the work tree has that object contents, return true, so that
2367 * prepare_temp_file() does not have to inflate and extract.
2368 */
2369 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2370 {
2371 struct cache_entry *ce;
2372 struct stat st;
2373 int pos, len;
2374
2375 /*
2376 * We do not read the cache ourselves here, because the
2377 * benchmark with my previous version that always reads cache
2378 * shows that it makes things worse for diff-tree comparing
2379 * two linux-2.6 kernel trees in an already checked out work
2380 * tree. This is because most diff-tree comparisons deal with
2381 * only a small number of files, while reading the cache is
2382 * expensive for a large project, and its cost outweighs the
2383 * savings we get by not inflating the object to a temporary
2384 * file. Practically, this code only helps when we are used
2385 * by diff-cache --cached, which does read the cache before
2386 * calling us.
2387 */
2388 if (!active_cache)
2389 return 0;
2390
2391 /* We want to avoid the working directory if our caller
2392 * doesn't need the data in a normal file, this system
2393 * is rather slow with its stat/open/mmap/close syscalls,
2394 * and the object is contained in a pack file. The pack
2395 * is probably already open and will be faster to obtain
2396 * the data through than the working directory. Loose
2397 * objects however would tend to be slower as they need
2398 * to be individually opened and inflated.
2399 */
2400 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2401 return 0;
2402
2403 len = strlen(name);
2404 pos = cache_name_pos(name, len);
2405 if (pos < 0)
2406 return 0;
2407 ce = active_cache[pos];
2408
2409 /*
2410 * This is not the sha1 we are looking for, or
2411 * unreusable because it is not a regular file.
2412 */
2413 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2414 return 0;
2415
2416 /*
2417 * If ce is marked as "assume unchanged", there is no
2418 * guarantee that work tree matches what we are looking for.
2419 */
2420 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2421 return 0;
2422
2423 /*
2424 * If ce matches the file in the work tree, we can reuse it.
2425 */
2426 if (ce_uptodate(ce) ||
2427 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2428 return 1;
2429
2430 return 0;
2431 }
2432
2433 static int populate_from_stdin(struct diff_filespec *s)
2434 {
2435 struct strbuf buf = STRBUF_INIT;
2436 size_t size = 0;
2437
2438 if (strbuf_read(&buf, 0, 0) < 0)
2439 return error("error while reading from stdin %s",
2440 strerror(errno));
2441
2442 s->should_munmap = 0;
2443 s->data = strbuf_detach(&buf, &size);
2444 s->size = size;
2445 s->should_free = 1;
2446 return 0;
2447 }
2448
2449 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2450 {
2451 int len;
2452 char *data = xmalloc(100), *dirty = "";
2453
2454 /* Are we looking at the work tree? */
2455 if (s->dirty_submodule)
2456 dirty = "-dirty";
2457
2458 len = snprintf(data, 100,
2459 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2460 s->data = data;
2461 s->size = len;
2462 s->should_free = 1;
2463 if (size_only) {
2464 s->data = NULL;
2465 free(data);
2466 }
2467 return 0;
2468 }
2469
2470 /*
2471 * While doing rename detection and pickaxe operation, we may need to
2472 * grab the data for the blob (or file) for our own in-core comparison.
2473 * diff_filespec has data and size fields for this purpose.
2474 */
2475 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2476 {
2477 int err = 0;
2478 if (!DIFF_FILE_VALID(s))
2479 die("internal error: asking to populate invalid file.");
2480 if (S_ISDIR(s->mode))
2481 return -1;
2482
2483 if (s->data)
2484 return 0;
2485
2486 if (size_only && 0 < s->size)
2487 return 0;
2488
2489 if (S_ISGITLINK(s->mode))
2490 return diff_populate_gitlink(s, size_only);
2491
2492 if (!s->sha1_valid ||
2493 reuse_worktree_file(s->path, s->sha1, 0)) {
2494 struct strbuf buf = STRBUF_INIT;
2495 struct stat st;
2496 int fd;
2497
2498 if (!strcmp(s->path, "-"))
2499 return populate_from_stdin(s);
2500
2501 if (lstat(s->path, &st) < 0) {
2502 if (errno == ENOENT) {
2503 err_empty:
2504 err = -1;
2505 empty:
2506 s->data = (char *)"";
2507 s->size = 0;
2508 return err;
2509 }
2510 }
2511 s->size = xsize_t(st.st_size);
2512 if (!s->size)
2513 goto empty;
2514 if (S_ISLNK(st.st_mode)) {
2515 struct strbuf sb = STRBUF_INIT;
2516
2517 if (strbuf_readlink(&sb, s->path, s->size))
2518 goto err_empty;
2519 s->size = sb.len;
2520 s->data = strbuf_detach(&sb, NULL);
2521 s->should_free = 1;
2522 return 0;
2523 }
2524 if (size_only)
2525 return 0;
2526 fd = open(s->path, O_RDONLY);
2527 if (fd < 0)
2528 goto err_empty;
2529 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2530 close(fd);
2531 s->should_munmap = 1;
2532
2533 /*
2534 * Convert from working tree format to canonical git format
2535 */
2536 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2537 size_t size = 0;
2538 munmap(s->data, s->size);
2539 s->should_munmap = 0;
2540 s->data = strbuf_detach(&buf, &size);
2541 s->size = size;
2542 s->should_free = 1;
2543 }
2544 }
2545 else {
2546 enum object_type type;
2547 if (size_only) {
2548 type = sha1_object_info(s->sha1, &s->size);
2549 if (type < 0)
2550 die("unable to read %s", sha1_to_hex(s->sha1));
2551 } else {
2552 s->data = read_sha1_file(s->sha1, &type, &s->size);
2553 if (!s->data)
2554 die("unable to read %s", sha1_to_hex(s->sha1));
2555 s->should_free = 1;
2556 }
2557 }
2558 return 0;
2559 }
2560
2561 void diff_free_filespec_blob(struct diff_filespec *s)
2562 {
2563 if (s->should_free)
2564 free(s->data);
2565 else if (s->should_munmap)
2566 munmap(s->data, s->size);
2567
2568 if (s->should_free || s->should_munmap) {
2569 s->should_free = s->should_munmap = 0;
2570 s->data = NULL;
2571 }
2572 }
2573
2574 void diff_free_filespec_data(struct diff_filespec *s)
2575 {
2576 diff_free_filespec_blob(s);
2577 free(s->cnt_data);
2578 s->cnt_data = NULL;
2579 }
2580
2581 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2582 void *blob,
2583 unsigned long size,
2584 const unsigned char *sha1,
2585 int mode)
2586 {
2587 int fd;
2588 struct strbuf buf = STRBUF_INIT;
2589 struct strbuf template = STRBUF_INIT;
2590 char *path_dup = xstrdup(path);
2591 const char *base = basename(path_dup);
2592
2593 /* Generate "XXXXXX_basename.ext" */
2594 strbuf_addstr(&template, "XXXXXX_");
2595 strbuf_addstr(&template, base);
2596
2597 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2598 strlen(base) + 1);
2599 if (fd < 0)
2600 die_errno("unable to create temp-file");
2601 if (convert_to_working_tree(path,
2602 (const char *)blob, (size_t)size, &buf)) {
2603 blob = buf.buf;
2604 size = buf.len;
2605 }
2606 if (write_in_full(fd, blob, size) != size)
2607 die_errno("unable to write temp-file");
2608 close(fd);
2609 temp->name = temp->tmp_path;
2610 strcpy(temp->hex, sha1_to_hex(sha1));
2611 temp->hex[40] = 0;
2612 sprintf(temp->mode, "%06o", mode);
2613 strbuf_release(&buf);
2614 strbuf_release(&template);
2615 free(path_dup);
2616 }
2617
2618 static struct diff_tempfile *prepare_temp_file(const char *name,
2619 struct diff_filespec *one)
2620 {
2621 struct diff_tempfile *temp = claim_diff_tempfile();
2622
2623 if (!DIFF_FILE_VALID(one)) {
2624 not_a_valid_file:
2625 /* A '-' entry produces this for file-2, and
2626 * a '+' entry produces this for file-1.
2627 */
2628 temp->name = "/dev/null";
2629 strcpy(temp->hex, ".");
2630 strcpy(temp->mode, ".");
2631 return temp;
2632 }
2633
2634 if (!remove_tempfile_installed) {
2635 atexit(remove_tempfile);
2636 sigchain_push_common(remove_tempfile_on_signal);
2637 remove_tempfile_installed = 1;
2638 }
2639
2640 if (!one->sha1_valid ||
2641 reuse_worktree_file(name, one->sha1, 1)) {
2642 struct stat st;
2643 if (lstat(name, &st) < 0) {
2644 if (errno == ENOENT)
2645 goto not_a_valid_file;
2646 die_errno("stat(%s)", name);
2647 }
2648 if (S_ISLNK(st.st_mode)) {
2649 struct strbuf sb = STRBUF_INIT;
2650 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2651 die_errno("readlink(%s)", name);
2652 prep_temp_blob(name, temp, sb.buf, sb.len,
2653 (one->sha1_valid ?
2654 one->sha1 : null_sha1),
2655 (one->sha1_valid ?
2656 one->mode : S_IFLNK));
2657 strbuf_release(&sb);
2658 }
2659 else {
2660 /* we can borrow from the file in the work tree */
2661 temp->name = name;
2662 if (!one->sha1_valid)
2663 strcpy(temp->hex, sha1_to_hex(null_sha1));
2664 else
2665 strcpy(temp->hex, sha1_to_hex(one->sha1));
2666 /* Even though we may sometimes borrow the
2667 * contents from the work tree, we always want
2668 * one->mode. mode is trustworthy even when
2669 * !(one->sha1_valid), as long as
2670 * DIFF_FILE_VALID(one).
2671 */
2672 sprintf(temp->mode, "%06o", one->mode);
2673 }
2674 return temp;
2675 }
2676 else {
2677 if (diff_populate_filespec(one, 0))
2678 die("cannot read data blob for %s", one->path);
2679 prep_temp_blob(name, temp, one->data, one->size,
2680 one->sha1, one->mode);
2681 }
2682 return temp;
2683 }
2684
2685 /* An external diff command takes:
2686 *
2687 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2688 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2689 *
2690 */
2691 static void run_external_diff(const char *pgm,
2692 const char *name,
2693 const char *other,
2694 struct diff_filespec *one,
2695 struct diff_filespec *two,
2696 const char *xfrm_msg,
2697 int complete_rewrite)
2698 {
2699 const char *spawn_arg[10];
2700 int retval;
2701 const char **arg = &spawn_arg[0];
2702
2703 if (one && two) {
2704 struct diff_tempfile *temp_one, *temp_two;
2705 const char *othername = (other ? other : name);
2706 temp_one = prepare_temp_file(name, one);
2707 temp_two = prepare_temp_file(othername, two);
2708 *arg++ = pgm;
2709 *arg++ = name;
2710 *arg++ = temp_one->name;
2711 *arg++ = temp_one->hex;
2712 *arg++ = temp_one->mode;
2713 *arg++ = temp_two->name;
2714 *arg++ = temp_two->hex;
2715 *arg++ = temp_two->mode;
2716 if (other) {
2717 *arg++ = other;
2718 *arg++ = xfrm_msg;
2719 }
2720 } else {
2721 *arg++ = pgm;
2722 *arg++ = name;
2723 }
2724 *arg = NULL;
2725 fflush(NULL);
2726 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2727 remove_tempfile();
2728 if (retval) {
2729 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2730 exit(1);
2731 }
2732 }
2733
2734 static int similarity_index(struct diff_filepair *p)
2735 {
2736 return p->score * 100 / MAX_SCORE;
2737 }
2738
2739 static void fill_metainfo(struct strbuf *msg,
2740 const char *name,
2741 const char *other,
2742 struct diff_filespec *one,
2743 struct diff_filespec *two,
2744 struct diff_options *o,
2745 struct diff_filepair *p,
2746 int *must_show_header,
2747 int use_color)
2748 {
2749 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2750 const char *reset = diff_get_color(use_color, DIFF_RESET);
2751 struct strbuf *msgbuf;
2752 char *line_prefix = "";
2753
2754 *must_show_header = 1;
2755 if (o->output_prefix) {
2756 msgbuf = o->output_prefix(o, o->output_prefix_data);
2757 line_prefix = msgbuf->buf;
2758 }
2759 strbuf_init(msg, PATH_MAX * 2 + 300);
2760 switch (p->status) {
2761 case DIFF_STATUS_COPIED:
2762 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2763 line_prefix, set, similarity_index(p));
2764 strbuf_addf(msg, "%s\n%s%scopy from ",
2765 reset, line_prefix, set);
2766 quote_c_style(name, msg, NULL, 0);
2767 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2768 quote_c_style(other, msg, NULL, 0);
2769 strbuf_addf(msg, "%s\n", reset);
2770 break;
2771 case DIFF_STATUS_RENAMED:
2772 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2773 line_prefix, set, similarity_index(p));
2774 strbuf_addf(msg, "%s\n%s%srename from ",
2775 reset, line_prefix, set);
2776 quote_c_style(name, msg, NULL, 0);
2777 strbuf_addf(msg, "%s\n%s%srename to ",
2778 reset, line_prefix, set);
2779 quote_c_style(other, msg, NULL, 0);
2780 strbuf_addf(msg, "%s\n", reset);
2781 break;
2782 case DIFF_STATUS_MODIFIED:
2783 if (p->score) {
2784 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2785 line_prefix,
2786 set, similarity_index(p), reset);
2787 break;
2788 }
2789 /* fallthru */
2790 default:
2791 *must_show_header = 0;
2792 }
2793 if (one && two && hashcmp(one->sha1, two->sha1)) {
2794 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2795
2796 if (DIFF_OPT_TST(o, BINARY)) {
2797 mmfile_t mf;
2798 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2799 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2800 abbrev = 40;
2801 }
2802 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2803 find_unique_abbrev(one->sha1, abbrev));
2804 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2805 if (one->mode == two->mode)
2806 strbuf_addf(msg, " %06o", one->mode);
2807 strbuf_addf(msg, "%s\n", reset);
2808 }
2809 }
2810
2811 static void run_diff_cmd(const char *pgm,
2812 const char *name,
2813 const char *other,
2814 const char *attr_path,
2815 struct diff_filespec *one,
2816 struct diff_filespec *two,
2817 struct strbuf *msg,
2818 struct diff_options *o,
2819 struct diff_filepair *p)
2820 {
2821 const char *xfrm_msg = NULL;
2822 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2823 int must_show_header = 0;
2824
2825 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2826 pgm = NULL;
2827 else {
2828 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2829 if (drv && drv->external)
2830 pgm = drv->external;
2831 }
2832
2833 if (msg) {
2834 /*
2835 * don't use colors when the header is intended for an
2836 * external diff driver
2837 */
2838 fill_metainfo(msg, name, other, one, two, o, p,
2839 &must_show_header,
2840 DIFF_OPT_TST(o, COLOR_DIFF) && !pgm);
2841 xfrm_msg = msg->len ? msg->buf : NULL;
2842 }
2843
2844 if (pgm) {
2845 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2846 complete_rewrite);
2847 return;
2848 }
2849 if (one && two)
2850 builtin_diff(name, other ? other : name,
2851 one, two, xfrm_msg, must_show_header,
2852 o, complete_rewrite);
2853 else
2854 fprintf(o->file, "* Unmerged path %s\n", name);
2855 }
2856
2857 static void diff_fill_sha1_info(struct diff_filespec *one)
2858 {
2859 if (DIFF_FILE_VALID(one)) {
2860 if (!one->sha1_valid) {
2861 struct stat st;
2862 if (!strcmp(one->path, "-")) {
2863 hashcpy(one->sha1, null_sha1);
2864 return;
2865 }
2866 if (lstat(one->path, &st) < 0)
2867 die_errno("stat '%s'", one->path);
2868 if (index_path(one->sha1, one->path, &st, 0))
2869 die("cannot hash %s", one->path);
2870 }
2871 }
2872 else
2873 hashclr(one->sha1);
2874 }
2875
2876 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2877 {
2878 /* Strip the prefix but do not molest /dev/null and absolute paths */
2879 if (*namep && **namep != '/') {
2880 *namep += prefix_length;
2881 if (**namep == '/')
2882 ++*namep;
2883 }
2884 if (*otherp && **otherp != '/') {
2885 *otherp += prefix_length;
2886 if (**otherp == '/')
2887 ++*otherp;
2888 }
2889 }
2890
2891 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2892 {
2893 const char *pgm = external_diff();
2894 struct strbuf msg;
2895 struct diff_filespec *one = p->one;
2896 struct diff_filespec *two = p->two;
2897 const char *name;
2898 const char *other;
2899 const char *attr_path;
2900
2901 name = p->one->path;
2902 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2903 attr_path = name;
2904 if (o->prefix_length)
2905 strip_prefix(o->prefix_length, &name, &other);
2906
2907 if (DIFF_PAIR_UNMERGED(p)) {
2908 run_diff_cmd(pgm, name, NULL, attr_path,
2909 NULL, NULL, NULL, o, p);
2910 return;
2911 }
2912
2913 diff_fill_sha1_info(one);
2914 diff_fill_sha1_info(two);
2915
2916 if (!pgm &&
2917 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2918 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2919 /*
2920 * a filepair that changes between file and symlink
2921 * needs to be split into deletion and creation.
2922 */
2923 struct diff_filespec *null = alloc_filespec(two->path);
2924 run_diff_cmd(NULL, name, other, attr_path,
2925 one, null, &msg, o, p);
2926 free(null);
2927 strbuf_release(&msg);
2928
2929 null = alloc_filespec(one->path);
2930 run_diff_cmd(NULL, name, other, attr_path,
2931 null, two, &msg, o, p);
2932 free(null);
2933 }
2934 else
2935 run_diff_cmd(pgm, name, other, attr_path,
2936 one, two, &msg, o, p);
2937
2938 strbuf_release(&msg);
2939 }
2940
2941 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2942 struct diffstat_t *diffstat)
2943 {
2944 const char *name;
2945 const char *other;
2946 int complete_rewrite = 0;
2947
2948 if (DIFF_PAIR_UNMERGED(p)) {
2949 /* unmerged */
2950 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2951 return;
2952 }
2953
2954 name = p->one->path;
2955 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2956
2957 if (o->prefix_length)
2958 strip_prefix(o->prefix_length, &name, &other);
2959
2960 diff_fill_sha1_info(p->one);
2961 diff_fill_sha1_info(p->two);
2962
2963 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2964 complete_rewrite = 1;
2965 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2966 }
2967
2968 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2969 {
2970 const char *name;
2971 const char *other;
2972 const char *attr_path;
2973
2974 if (DIFF_PAIR_UNMERGED(p)) {
2975 /* unmerged */
2976 return;
2977 }
2978
2979 name = p->one->path;
2980 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2981 attr_path = other ? other : name;
2982
2983 if (o->prefix_length)
2984 strip_prefix(o->prefix_length, &name, &other);
2985
2986 diff_fill_sha1_info(p->one);
2987 diff_fill_sha1_info(p->two);
2988
2989 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2990 }
2991
2992 void diff_setup(struct diff_options *options)
2993 {
2994 memcpy(options, &default_diff_options, sizeof(*options));
2995
2996 options->file = stdout;
2997
2998 options->line_termination = '\n';
2999 options->break_opt = -1;
3000 options->rename_limit = -1;
3001 options->dirstat_permille = diff_dirstat_permille_default;
3002 options->context = 3;
3003
3004 options->change = diff_change;
3005 options->add_remove = diff_addremove;
3006 if (diff_use_color_default > 0)
3007 DIFF_OPT_SET(options, COLOR_DIFF);
3008 options->detect_rename = diff_detect_rename_default;
3009
3010 if (diff_no_prefix) {
3011 options->a_prefix = options->b_prefix = "";
3012 } else if (!diff_mnemonic_prefix) {
3013 options->a_prefix = "a/";
3014 options->b_prefix = "b/";
3015 }
3016 }
3017
3018 int diff_setup_done(struct diff_options *options)
3019 {
3020 int count = 0;
3021
3022 if (options->output_format & DIFF_FORMAT_NAME)
3023 count++;
3024 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3025 count++;
3026 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3027 count++;
3028 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3029 count++;
3030 if (count > 1)
3031 die("--name-only, --name-status, --check and -s are mutually exclusive");
3032
3033 /*
3034 * Most of the time we can say "there are changes"
3035 * only by checking if there are changed paths, but
3036 * --ignore-whitespace* options force us to look
3037 * inside contents.
3038 */
3039
3040 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3041 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3042 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3043 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3044 else
3045 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3046
3047 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3048 options->detect_rename = DIFF_DETECT_COPY;
3049
3050 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3051 options->prefix = NULL;
3052 if (options->prefix)
3053 options->prefix_length = strlen(options->prefix);
3054 else
3055 options->prefix_length = 0;
3056
3057 if (options->output_format & (DIFF_FORMAT_NAME |
3058 DIFF_FORMAT_NAME_STATUS |
3059 DIFF_FORMAT_CHECKDIFF |
3060 DIFF_FORMAT_NO_OUTPUT))
3061 options->output_format &= ~(DIFF_FORMAT_RAW |
3062 DIFF_FORMAT_NUMSTAT |
3063 DIFF_FORMAT_DIFFSTAT |
3064 DIFF_FORMAT_SHORTSTAT |
3065 DIFF_FORMAT_DIRSTAT |
3066 DIFF_FORMAT_SUMMARY |
3067 DIFF_FORMAT_PATCH);
3068
3069 /*
3070 * These cases always need recursive; we do not drop caller-supplied
3071 * recursive bits for other formats here.
3072 */
3073 if (options->output_format & (DIFF_FORMAT_PATCH |
3074 DIFF_FORMAT_NUMSTAT |
3075 DIFF_FORMAT_DIFFSTAT |
3076 DIFF_FORMAT_SHORTSTAT |
3077 DIFF_FORMAT_DIRSTAT |
3078 DIFF_FORMAT_SUMMARY |
3079 DIFF_FORMAT_CHECKDIFF))
3080 DIFF_OPT_SET(options, RECURSIVE);
3081 /*
3082 * Also pickaxe would not work very well if you do not say recursive
3083 */
3084 if (options->pickaxe)
3085 DIFF_OPT_SET(options, RECURSIVE);
3086 /*
3087 * When patches are generated, submodules diffed against the work tree
3088 * must be checked for dirtiness too so it can be shown in the output
3089 */
3090 if (options->output_format & DIFF_FORMAT_PATCH)
3091 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3092
3093 if (options->detect_rename && options->rename_limit < 0)
3094 options->rename_limit = diff_rename_limit_default;
3095 if (options->setup & DIFF_SETUP_USE_CACHE) {
3096 if (!active_cache)
3097 /* read-cache does not die even when it fails
3098 * so it is safe for us to do this here. Also
3099 * it does not smudge active_cache or active_nr
3100 * when it fails, so we do not have to worry about
3101 * cleaning it up ourselves either.
3102 */
3103 read_cache();
3104 }
3105 if (options->abbrev <= 0 || 40 < options->abbrev)
3106 options->abbrev = 40; /* full */
3107
3108 /*
3109 * It does not make sense to show the first hit we happened
3110 * to have found. It does not make sense not to return with
3111 * exit code in such a case either.
3112 */
3113 if (DIFF_OPT_TST(options, QUICK)) {
3114 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3115 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3116 }
3117
3118 return 0;
3119 }
3120
3121 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3122 {
3123 char c, *eq;
3124 int len;
3125
3126 if (*arg != '-')
3127 return 0;
3128 c = *++arg;
3129 if (!c)
3130 return 0;
3131 if (c == arg_short) {
3132 c = *++arg;
3133 if (!c)
3134 return 1;
3135 if (val && isdigit(c)) {
3136 char *end;
3137 int n = strtoul(arg, &end, 10);
3138 if (*end)
3139 return 0;
3140 *val = n;
3141 return 1;
3142 }
3143 return 0;
3144 }
3145 if (c != '-')
3146 return 0;
3147 arg++;
3148 eq = strchr(arg, '=');
3149 if (eq)
3150 len = eq - arg;
3151 else
3152 len = strlen(arg);
3153 if (!len || strncmp(arg, arg_long, len))
3154 return 0;
3155 if (eq) {
3156 int n;
3157 char *end;
3158 if (!isdigit(*++eq))
3159 return 0;
3160 n = strtoul(eq, &end, 10);
3161 if (*end)
3162 return 0;
3163 *val = n;
3164 }
3165 return 1;
3166 }
3167
3168 static int diff_scoreopt_parse(const char *opt);
3169
3170 static inline int short_opt(char opt, const char **argv,
3171 const char **optarg)
3172 {
3173 const char *arg = argv[0];
3174 if (arg[0] != '-' || arg[1] != opt)
3175 return 0;
3176 if (arg[2] != '\0') {
3177 *optarg = arg + 2;
3178 return 1;
3179 }
3180 if (!argv[1])
3181 die("Option '%c' requires a value", opt);
3182 *optarg = argv[1];
3183 return 2;
3184 }
3185
3186 int parse_long_opt(const char *opt, const char **argv,
3187 const char **optarg)
3188 {
3189 const char *arg = argv[0];
3190 if (arg[0] != '-' || arg[1] != '-')
3191 return 0;
3192 arg += strlen("--");
3193 if (prefixcmp(arg, opt))
3194 return 0;
3195 arg += strlen(opt);
3196 if (*arg == '=') { /* sticked form: --option=value */
3197 *optarg = arg + 1;
3198 return 1;
3199 }
3200 if (*arg != '\0')
3201 return 0;
3202 /* separate form: --option value */
3203 if (!argv[1])
3204 die("Option '--%s' requires a value", opt);
3205 *optarg = argv[1];
3206 return 2;
3207 }
3208
3209 static int stat_opt(struct diff_options *options, const char **av)
3210 {
3211 const char *arg = av[0];
3212 char *end;
3213 int width = options->stat_width;
3214 int name_width = options->stat_name_width;
3215 int argcount = 1;
3216
3217 arg += strlen("--stat");
3218 end = (char *)arg;
3219
3220 switch (*arg) {
3221 case '-':
3222 if (!prefixcmp(arg, "-width")) {
3223 arg += strlen("-width");
3224 if (*arg == '=')
3225 width = strtoul(arg + 1, &end, 10);
3226 else if (!*arg && !av[1])
3227 die("Option '--stat-width' requires a value");
3228 else if (!*arg) {
3229 width = strtoul(av[1], &end, 10);
3230 argcount = 2;
3231 }
3232 } else if (!prefixcmp(arg, "-name-width")) {
3233 arg += strlen("-name-width");
3234 if (*arg == '=')
3235 name_width = strtoul(arg + 1, &end, 10);
3236 else if (!*arg && !av[1])
3237 die("Option '--stat-name-width' requires a value");
3238 else if (!*arg) {
3239 name_width = strtoul(av[1], &end, 10);
3240 argcount = 2;
3241 }
3242 }
3243 break;
3244 case '=':
3245 width = strtoul(arg+1, &end, 10);
3246 if (*end == ',')
3247 name_width = strtoul(end+1, &end, 10);
3248 }
3249
3250 /* Important! This checks all the error cases! */
3251 if (*end)
3252 return 0;
3253 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3254 options->stat_name_width = name_width;
3255 options->stat_width = width;
3256 return argcount;
3257 }
3258
3259 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3260 {
3261 struct strbuf errmsg = STRBUF_INIT;
3262 if (parse_dirstat_params(options, params, &errmsg))
3263 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3264 errmsg.buf);
3265 strbuf_release(&errmsg);
3266 /*
3267 * The caller knows a dirstat-related option is given from the command
3268 * line; allow it to say "return this_function();"
3269 */
3270 options->output_format |= DIFF_FORMAT_DIRSTAT;
3271 return 1;
3272 }
3273
3274 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3275 {
3276 const char *arg = av[0];
3277 const char *optarg;
3278 int argcount;
3279
3280 /* Output format options */
3281 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3282 options->output_format |= DIFF_FORMAT_PATCH;
3283 else if (opt_arg(arg, 'U', "unified", &options->context))
3284 options->output_format |= DIFF_FORMAT_PATCH;
3285 else if (!strcmp(arg, "--raw"))
3286 options->output_format |= DIFF_FORMAT_RAW;
3287 else if (!strcmp(arg, "--patch-with-raw"))
3288 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3289 else if (!strcmp(arg, "--numstat"))
3290 options->output_format |= DIFF_FORMAT_NUMSTAT;
3291 else if (!strcmp(arg, "--shortstat"))
3292 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3293 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3294 return parse_dirstat_opt(options, "");
3295 else if (!prefixcmp(arg, "-X"))
3296 return parse_dirstat_opt(options, arg + 2);
3297 else if (!prefixcmp(arg, "--dirstat="))
3298 return parse_dirstat_opt(options, arg + 10);
3299 else if (!strcmp(arg, "--cumulative"))
3300 return parse_dirstat_opt(options, "cumulative");
3301 else if (!strcmp(arg, "--dirstat-by-file"))
3302 return parse_dirstat_opt(options, "files");
3303 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3304 parse_dirstat_opt(options, "files");
3305 return parse_dirstat_opt(options, arg + 18);
3306 }
3307 else if (!strcmp(arg, "--check"))
3308 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3309 else if (!strcmp(arg, "--summary"))
3310 options->output_format |= DIFF_FORMAT_SUMMARY;
3311 else if (!strcmp(arg, "--patch-with-stat"))
3312 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3313 else if (!strcmp(arg, "--name-only"))
3314 options->output_format |= DIFF_FORMAT_NAME;
3315 else if (!strcmp(arg, "--name-status"))
3316 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3317 else if (!strcmp(arg, "-s"))
3318 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3319 else if (!prefixcmp(arg, "--stat"))
3320 /* --stat, --stat-width, or --stat-name-width */
3321 return stat_opt(options, av);
3322
3323 /* renames options */
3324 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3325 !strcmp(arg, "--break-rewrites")) {
3326 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3327 return error("invalid argument to -B: %s", arg+2);
3328 }
3329 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3330 !strcmp(arg, "--find-renames")) {
3331 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3332 return error("invalid argument to -M: %s", arg+2);
3333 options->detect_rename = DIFF_DETECT_RENAME;
3334 }
3335 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3336 options->irreversible_delete = 1;
3337 }
3338 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3339 !strcmp(arg, "--find-copies")) {
3340 if (options->detect_rename == DIFF_DETECT_COPY)
3341 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3342 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3343 return error("invalid argument to -C: %s", arg+2);
3344 options->detect_rename = DIFF_DETECT_COPY;
3345 }
3346 else if (!strcmp(arg, "--no-renames"))
3347 options->detect_rename = 0;
3348 else if (!strcmp(arg, "--relative"))
3349 DIFF_OPT_SET(options, RELATIVE_NAME);
3350 else if (!prefixcmp(arg, "--relative=")) {
3351 DIFF_OPT_SET(options, RELATIVE_NAME);
3352 options->prefix = arg + 11;
3353 }
3354
3355 /* xdiff options */
3356 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3357 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3358 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3359 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3360 else if (!strcmp(arg, "--ignore-space-at-eol"))
3361 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3362 else if (!strcmp(arg, "--patience"))
3363 DIFF_XDL_SET(options, PATIENCE_DIFF);
3364
3365 /* flags options */
3366 else if (!strcmp(arg, "--binary")) {
3367 options->output_format |= DIFF_FORMAT_PATCH;
3368 DIFF_OPT_SET(options, BINARY);
3369 }
3370 else if (!strcmp(arg, "--full-index"))
3371 DIFF_OPT_SET(options, FULL_INDEX);
3372 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3373 DIFF_OPT_SET(options, TEXT);
3374 else if (!strcmp(arg, "-R"))
3375 DIFF_OPT_SET(options, REVERSE_DIFF);
3376 else if (!strcmp(arg, "--find-copies-harder"))
3377 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3378 else if (!strcmp(arg, "--follow"))
3379 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3380 else if (!strcmp(arg, "--color"))
3381 DIFF_OPT_SET(options, COLOR_DIFF);
3382 else if (!prefixcmp(arg, "--color=")) {
3383 int value = git_config_colorbool(NULL, arg+8, -1);
3384 if (value == 0)
3385 DIFF_OPT_CLR(options, COLOR_DIFF);
3386 else if (value > 0)
3387 DIFF_OPT_SET(options, COLOR_DIFF);
3388 else
3389 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3390 }
3391 else if (!strcmp(arg, "--no-color"))
3392 DIFF_OPT_CLR(options, COLOR_DIFF);
3393 else if (!strcmp(arg, "--color-words")) {
3394 DIFF_OPT_SET(options, COLOR_DIFF);
3395 options->word_diff = DIFF_WORDS_COLOR;
3396 }
3397 else if (!prefixcmp(arg, "--color-words=")) {
3398 DIFF_OPT_SET(options, COLOR_DIFF);
3399 options->word_diff = DIFF_WORDS_COLOR;
3400 options->word_regex = arg + 14;
3401 }
3402 else if (!strcmp(arg, "--word-diff")) {
3403 if (options->word_diff == DIFF_WORDS_NONE)
3404 options->word_diff = DIFF_WORDS_PLAIN;
3405 }
3406 else if (!prefixcmp(arg, "--word-diff=")) {
3407 const char *type = arg + 12;
3408 if (!strcmp(type, "plain"))
3409 options->word_diff = DIFF_WORDS_PLAIN;
3410 else if (!strcmp(type, "color")) {
3411 DIFF_OPT_SET(options, COLOR_DIFF);
3412 options->word_diff = DIFF_WORDS_COLOR;
3413 }
3414 else if (!strcmp(type, "porcelain"))
3415 options->word_diff = DIFF_WORDS_PORCELAIN;
3416 else if (!strcmp(type, "none"))
3417 options->word_diff = DIFF_WORDS_NONE;
3418 else
3419 die("bad --word-diff argument: %s", type);
3420 }
3421 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3422 if (options->word_diff == DIFF_WORDS_NONE)
3423 options->word_diff = DIFF_WORDS_PLAIN;
3424 options->word_regex = optarg;
3425 return argcount;
3426 }
3427 else if (!strcmp(arg, "--exit-code"))
3428 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3429 else if (!strcmp(arg, "--quiet"))
3430 DIFF_OPT_SET(options, QUICK);
3431 else if (!strcmp(arg, "--ext-diff"))
3432 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3433 else if (!strcmp(arg, "--no-ext-diff"))
3434 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3435 else if (!strcmp(arg, "--textconv"))
3436 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3437 else if (!strcmp(arg, "--no-textconv"))
3438 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3439 else if (!strcmp(arg, "--ignore-submodules")) {
3440 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3441 handle_ignore_submodules_arg(options, "all");
3442 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3443 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3444 handle_ignore_submodules_arg(options, arg + 20);
3445 } else if (!strcmp(arg, "--submodule"))
3446 DIFF_OPT_SET(options, SUBMODULE_LOG);
3447 else if (!prefixcmp(arg, "--submodule=")) {
3448 if (!strcmp(arg + 12, "log"))
3449 DIFF_OPT_SET(options, SUBMODULE_LOG);
3450 }
3451
3452 /* misc options */
3453 else if (!strcmp(arg, "-z"))
3454 options->line_termination = 0;
3455 else if ((argcount = short_opt('l', av, &optarg))) {
3456 options->rename_limit = strtoul(optarg, NULL, 10);
3457 return argcount;
3458 }
3459 else if ((argcount = short_opt('S', av, &optarg))) {
3460 options->pickaxe = optarg;
3461 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3462 return argcount;
3463 } else if ((argcount = short_opt('G', av, &optarg))) {
3464 options->pickaxe = optarg;
3465 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3466 return argcount;
3467 }
3468 else if (!strcmp(arg, "--pickaxe-all"))
3469 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3470 else if (!strcmp(arg, "--pickaxe-regex"))
3471 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3472 else if ((argcount = short_opt('O', av, &optarg))) {
3473 options->orderfile = optarg;
3474 return argcount;
3475 }
3476 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3477 options->filter = optarg;
3478 return argcount;
3479 }
3480 else if (!strcmp(arg, "--abbrev"))
3481 options->abbrev = DEFAULT_ABBREV;
3482 else if (!prefixcmp(arg, "--abbrev=")) {
3483 options->abbrev = strtoul(arg + 9, NULL, 10);
3484 if (options->abbrev < MINIMUM_ABBREV)
3485 options->abbrev = MINIMUM_ABBREV;
3486 else if (40 < options->abbrev)
3487 options->abbrev = 40;
3488 }
3489 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3490 options->a_prefix = optarg;
3491 return argcount;
3492 }
3493 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3494 options->b_prefix = optarg;
3495 return argcount;
3496 }
3497 else if (!strcmp(arg, "--no-prefix"))
3498 options->a_prefix = options->b_prefix = "";
3499 else if (opt_arg(arg, '\0', "inter-hunk-context",
3500 &options->interhunkcontext))
3501 ;
3502 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3503 options->file = fopen(optarg, "w");
3504 if (!options->file)
3505 die_errno("Could not open '%s'", optarg);
3506 options->close_file = 1;
3507 return argcount;
3508 } else
3509 return 0;
3510 return 1;
3511 }
3512
3513 int parse_rename_score(const char **cp_p)
3514 {
3515 unsigned long num, scale;
3516 int ch, dot;
3517 const char *cp = *cp_p;
3518
3519 num = 0;
3520 scale = 1;
3521 dot = 0;
3522 for (;;) {
3523 ch = *cp;
3524 if ( !dot && ch == '.' ) {
3525 scale = 1;
3526 dot = 1;
3527 } else if ( ch == '%' ) {
3528 scale = dot ? scale*100 : 100;
3529 cp++; /* % is always at the end */
3530 break;
3531 } else if ( ch >= '0' && ch <= '9' ) {
3532 if ( scale < 100000 ) {
3533 scale *= 10;
3534 num = (num*10) + (ch-'0');
3535 }
3536 } else {
3537 break;
3538 }
3539 cp++;
3540 }
3541 *cp_p = cp;
3542
3543 /* user says num divided by scale and we say internally that
3544 * is MAX_SCORE * num / scale.
3545 */
3546 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3547 }
3548
3549 static int diff_scoreopt_parse(const char *opt)
3550 {
3551 int opt1, opt2, cmd;
3552
3553 if (*opt++ != '-')
3554 return -1;
3555 cmd = *opt++;
3556 if (cmd == '-') {
3557 /* convert the long-form arguments into short-form versions */
3558 if (!prefixcmp(opt, "break-rewrites")) {
3559 opt += strlen("break-rewrites");
3560 if (*opt == 0 || *opt++ == '=')
3561 cmd = 'B';
3562 } else if (!prefixcmp(opt, "find-copies")) {
3563 opt += strlen("find-copies");
3564 if (*opt == 0 || *opt++ == '=')
3565 cmd = 'C';
3566 } else if (!prefixcmp(opt, "find-renames")) {
3567 opt += strlen("find-renames");
3568 if (*opt == 0 || *opt++ == '=')
3569 cmd = 'M';
3570 }
3571 }
3572 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3573 return -1; /* that is not a -M, -C nor -B option */
3574
3575 opt1 = parse_rename_score(&opt);
3576 if (cmd != 'B')
3577 opt2 = 0;
3578 else {
3579 if (*opt == 0)
3580 opt2 = 0;
3581 else if (*opt != '/')
3582 return -1; /* we expect -B80/99 or -B80 */
3583 else {
3584 opt++;
3585 opt2 = parse_rename_score(&opt);
3586 }
3587 }
3588 if (*opt != 0)
3589 return -1;
3590 return opt1 | (opt2 << 16);
3591 }
3592
3593 struct diff_queue_struct diff_queued_diff;
3594
3595 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3596 {
3597 if (queue->alloc <= queue->nr) {
3598 queue->alloc = alloc_nr(queue->alloc);
3599 queue->queue = xrealloc(queue->queue,
3600 sizeof(dp) * queue->alloc);
3601 }
3602 queue->queue[queue->nr++] = dp;
3603 }
3604
3605 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3606 struct diff_filespec *one,
3607 struct diff_filespec *two)
3608 {
3609 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3610 dp->one = one;
3611 dp->two = two;
3612 if (queue)
3613 diff_q(queue, dp);
3614 return dp;
3615 }
3616
3617 void diff_free_filepair(struct diff_filepair *p)
3618 {
3619 free_filespec(p->one);
3620 free_filespec(p->two);
3621 free(p);
3622 }
3623
3624 /* This is different from find_unique_abbrev() in that
3625 * it stuffs the result with dots for alignment.
3626 */
3627 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3628 {
3629 int abblen;
3630 const char *abbrev;
3631 if (len == 40)
3632 return sha1_to_hex(sha1);
3633
3634 abbrev = find_unique_abbrev(sha1, len);
3635 abblen = strlen(abbrev);
3636 if (abblen < 37) {
3637 static char hex[41];
3638 if (len < abblen && abblen <= len + 2)
3639 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3640 else
3641 sprintf(hex, "%s...", abbrev);
3642 return hex;
3643 }
3644 return sha1_to_hex(sha1);
3645 }
3646
3647 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3648 {
3649 int line_termination = opt->line_termination;
3650 int inter_name_termination = line_termination ? '\t' : '\0';
3651 if (opt->output_prefix) {
3652 struct strbuf *msg = NULL;
3653 msg = opt->output_prefix(opt, opt->output_prefix_data);
3654 fprintf(opt->file, "%s", msg->buf);
3655 }
3656
3657 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3658 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3659 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3660 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3661 }
3662 if (p->score) {
3663 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3664 inter_name_termination);
3665 } else {
3666 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3667 }
3668
3669 if (p->status == DIFF_STATUS_COPIED ||
3670 p->status == DIFF_STATUS_RENAMED) {
3671 const char *name_a, *name_b;
3672 name_a = p->one->path;
3673 name_b = p->two->path;
3674 strip_prefix(opt->prefix_length, &name_a, &name_b);
3675 write_name_quoted(name_a, opt->file, inter_name_termination);
3676 write_name_quoted(name_b, opt->file, line_termination);
3677 } else {
3678 const char *name_a, *name_b;
3679 name_a = p->one->mode ? p->one->path : p->two->path;
3680 name_b = NULL;
3681 strip_prefix(opt->prefix_length, &name_a, &name_b);
3682 write_name_quoted(name_a, opt->file, line_termination);
3683 }
3684 }
3685
3686 int diff_unmodified_pair(struct diff_filepair *p)
3687 {
3688 /* This function is written stricter than necessary to support
3689 * the currently implemented transformers, but the idea is to
3690 * let transformers to produce diff_filepairs any way they want,
3691 * and filter and clean them up here before producing the output.
3692 */
3693 struct diff_filespec *one = p->one, *two = p->two;
3694
3695 if (DIFF_PAIR_UNMERGED(p))
3696 return 0; /* unmerged is interesting */
3697
3698 /* deletion, addition, mode or type change
3699 * and rename are all interesting.
3700 */
3701 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3702 DIFF_PAIR_MODE_CHANGED(p) ||
3703 strcmp(one->path, two->path))
3704 return 0;
3705
3706 /* both are valid and point at the same path. that is, we are
3707 * dealing with a change.
3708 */
3709 if (one->sha1_valid && two->sha1_valid &&
3710 !hashcmp(one->sha1, two->sha1) &&
3711 !one->dirty_submodule && !two->dirty_submodule)
3712 return 1; /* no change */
3713 if (!one->sha1_valid && !two->sha1_valid)
3714 return 1; /* both look at the same file on the filesystem. */
3715 return 0;
3716 }
3717
3718 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3719 {
3720 if (diff_unmodified_pair(p))
3721 return;
3722
3723 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3724 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3725 return; /* no tree diffs in patch format */
3726
3727 run_diff(p, o);
3728 }
3729
3730 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3731 struct diffstat_t *diffstat)
3732 {
3733 if (diff_unmodified_pair(p))
3734 return;
3735
3736 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3737 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3738 return; /* no useful stat for tree diffs */
3739
3740 run_diffstat(p, o, diffstat);
3741 }
3742
3743 static void diff_flush_checkdiff(struct diff_filepair *p,
3744 struct diff_options *o)
3745 {
3746 if (diff_unmodified_pair(p))
3747 return;
3748
3749 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3750 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3751 return; /* nothing to check in tree diffs */
3752
3753 run_checkdiff(p, o);
3754 }
3755
3756 int diff_queue_is_empty(void)
3757 {
3758 struct diff_queue_struct *q = &diff_queued_diff;
3759 int i;
3760 for (i = 0; i < q->nr; i++)
3761 if (!diff_unmodified_pair(q->queue[i]))
3762 return 0;
3763 return 1;
3764 }
3765
3766 #if DIFF_DEBUG
3767 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3768 {
3769 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3770 x, one ? one : "",
3771 s->path,
3772 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3773 s->mode,
3774 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3775 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3776 x, one ? one : "",
3777 s->size, s->xfrm_flags);
3778 }
3779
3780 void diff_debug_filepair(const struct diff_filepair *p, int i)
3781 {
3782 diff_debug_filespec(p->one, i, "one");
3783 diff_debug_filespec(p->two, i, "two");
3784 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3785 p->score, p->status ? p->status : '?',
3786 p->one->rename_used, p->broken_pair);
3787 }
3788
3789 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3790 {
3791 int i;
3792 if (msg)
3793 fprintf(stderr, "%s\n", msg);
3794 fprintf(stderr, "q->nr = %d\n", q->nr);
3795 for (i = 0; i < q->nr; i++) {
3796 struct diff_filepair *p = q->queue[i];
3797 diff_debug_filepair(p, i);
3798 }
3799 }
3800 #endif
3801
3802 static void diff_resolve_rename_copy(void)
3803 {
3804 int i;
3805 struct diff_filepair *p;
3806 struct diff_queue_struct *q = &diff_queued_diff;
3807
3808 diff_debug_queue("resolve-rename-copy", q);
3809
3810 for (i = 0; i < q->nr; i++) {
3811 p = q->queue[i];
3812 p->status = 0; /* undecided */
3813 if (DIFF_PAIR_UNMERGED(p))
3814 p->status = DIFF_STATUS_UNMERGED;
3815 else if (!DIFF_FILE_VALID(p->one))
3816 p->status = DIFF_STATUS_ADDED;
3817 else if (!DIFF_FILE_VALID(p->two))
3818 p->status = DIFF_STATUS_DELETED;
3819 else if (DIFF_PAIR_TYPE_CHANGED(p))
3820 p->status = DIFF_STATUS_TYPE_CHANGED;
3821
3822 /* from this point on, we are dealing with a pair
3823 * whose both sides are valid and of the same type, i.e.
3824 * either in-place edit or rename/copy edit.
3825 */
3826 else if (DIFF_PAIR_RENAME(p)) {
3827 /*
3828 * A rename might have re-connected a broken
3829 * pair up, causing the pathnames to be the
3830 * same again. If so, that's not a rename at
3831 * all, just a modification..
3832 *
3833 * Otherwise, see if this source was used for
3834 * multiple renames, in which case we decrement
3835 * the count, and call it a copy.
3836 */
3837 if (!strcmp(p->one->path, p->two->path))
3838 p->status = DIFF_STATUS_MODIFIED;
3839 else if (--p->one->rename_used > 0)
3840 p->status = DIFF_STATUS_COPIED;
3841 else
3842 p->status = DIFF_STATUS_RENAMED;
3843 }
3844 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3845 p->one->mode != p->two->mode ||
3846 p->one->dirty_submodule ||
3847 p->two->dirty_submodule ||
3848 is_null_sha1(p->one->sha1))
3849 p->status = DIFF_STATUS_MODIFIED;
3850 else {
3851 /* This is a "no-change" entry and should not
3852 * happen anymore, but prepare for broken callers.
3853 */
3854 error("feeding unmodified %s to diffcore",
3855 p->one->path);
3856 p->status = DIFF_STATUS_UNKNOWN;
3857 }
3858 }
3859 diff_debug_queue("resolve-rename-copy done", q);
3860 }
3861
3862 static int check_pair_status(struct diff_filepair *p)
3863 {
3864 switch (p->status) {
3865 case DIFF_STATUS_UNKNOWN:
3866 return 0;
3867 case 0:
3868 die("internal error in diff-resolve-rename-copy");
3869 default:
3870 return 1;
3871 }
3872 }
3873
3874 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3875 {
3876 int fmt = opt->output_format;
3877
3878 if (fmt & DIFF_FORMAT_CHECKDIFF)
3879 diff_flush_checkdiff(p, opt);
3880 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3881 diff_flush_raw(p, opt);
3882 else if (fmt & DIFF_FORMAT_NAME) {
3883 const char *name_a, *name_b;
3884 name_a = p->two->path;
3885 name_b = NULL;
3886 strip_prefix(opt->prefix_length, &name_a, &name_b);
3887 write_name_quoted(name_a, opt->file, opt->line_termination);
3888 }
3889 }
3890
3891 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3892 {
3893 if (fs->mode)
3894 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3895 else
3896 fprintf(file, " %s ", newdelete);
3897 write_name_quoted(fs->path, file, '\n');
3898 }
3899
3900
3901 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
3902 const char *line_prefix)
3903 {
3904 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3905 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
3906 p->two->mode, show_name ? ' ' : '\n');
3907 if (show_name) {
3908 write_name_quoted(p->two->path, file, '\n');
3909 }
3910 }
3911 }
3912
3913 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
3914 const char *line_prefix)
3915 {
3916 char *names = pprint_rename(p->one->path, p->two->path);
3917
3918 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3919 free(names);
3920 show_mode_change(file, p, 0, line_prefix);
3921 }
3922
3923 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
3924 {
3925 FILE *file = opt->file;
3926 char *line_prefix = "";
3927
3928 if (opt->output_prefix) {
3929 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
3930 line_prefix = buf->buf;
3931 }
3932
3933 switch(p->status) {
3934 case DIFF_STATUS_DELETED:
3935 fputs(line_prefix, file);
3936 show_file_mode_name(file, "delete", p->one);
3937 break;
3938 case DIFF_STATUS_ADDED:
3939 fputs(line_prefix, file);
3940 show_file_mode_name(file, "create", p->two);
3941 break;
3942 case DIFF_STATUS_COPIED:
3943 fputs(line_prefix, file);
3944 show_rename_copy(file, "copy", p, line_prefix);
3945 break;
3946 case DIFF_STATUS_RENAMED:
3947 fputs(line_prefix, file);
3948 show_rename_copy(file, "rename", p, line_prefix);
3949 break;
3950 default:
3951 if (p->score) {
3952 fprintf(file, "%s rewrite ", line_prefix);
3953 write_name_quoted(p->two->path, file, ' ');
3954 fprintf(file, "(%d%%)\n", similarity_index(p));
3955 }
3956 show_mode_change(file, p, !p->score, line_prefix);
3957 break;
3958 }
3959 }
3960
3961 struct patch_id_t {
3962 git_SHA_CTX *ctx;
3963 int patchlen;
3964 };
3965
3966 static int remove_space(char *line, int len)
3967 {
3968 int i;
3969 char *dst = line;
3970 unsigned char c;
3971
3972 for (i = 0; i < len; i++)
3973 if (!isspace((c = line[i])))
3974 *dst++ = c;
3975
3976 return dst - line;
3977 }
3978
3979 static void patch_id_consume(void *priv, char *line, unsigned long len)
3980 {
3981 struct patch_id_t *data = priv;
3982 int new_len;
3983
3984 /* Ignore line numbers when computing the SHA1 of the patch */
3985 if (!prefixcmp(line, "@@ -"))
3986 return;
3987
3988 new_len = remove_space(line, len);
3989
3990 git_SHA1_Update(data->ctx, line, new_len);
3991 data->patchlen += new_len;
3992 }
3993
3994 /* returns 0 upon success, and writes result into sha1 */
3995 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3996 {
3997 struct diff_queue_struct *q = &diff_queued_diff;
3998 int i;
3999 git_SHA_CTX ctx;
4000 struct patch_id_t data;
4001 char buffer[PATH_MAX * 4 + 20];
4002
4003 git_SHA1_Init(&ctx);
4004 memset(&data, 0, sizeof(struct patch_id_t));
4005 data.ctx = &ctx;
4006
4007 for (i = 0; i < q->nr; i++) {
4008 xpparam_t xpp;
4009 xdemitconf_t xecfg;
4010 mmfile_t mf1, mf2;
4011 struct diff_filepair *p = q->queue[i];
4012 int len1, len2;
4013
4014 memset(&xpp, 0, sizeof(xpp));
4015 memset(&xecfg, 0, sizeof(xecfg));
4016 if (p->status == 0)
4017 return error("internal diff status error");
4018 if (p->status == DIFF_STATUS_UNKNOWN)
4019 continue;
4020 if (diff_unmodified_pair(p))
4021 continue;
4022 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4023 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4024 continue;
4025 if (DIFF_PAIR_UNMERGED(p))
4026 continue;
4027
4028 diff_fill_sha1_info(p->one);
4029 diff_fill_sha1_info(p->two);
4030 if (fill_mmfile(&mf1, p->one) < 0 ||
4031 fill_mmfile(&mf2, p->two) < 0)
4032 return error("unable to read files to diff");
4033
4034 len1 = remove_space(p->one->path, strlen(p->one->path));
4035 len2 = remove_space(p->two->path, strlen(p->two->path));
4036 if (p->one->mode == 0)
4037 len1 = snprintf(buffer, sizeof(buffer),
4038 "diff--gita/%.*sb/%.*s"
4039 "newfilemode%06o"
4040 "---/dev/null"
4041 "+++b/%.*s",
4042 len1, p->one->path,
4043 len2, p->two->path,
4044 p->two->mode,
4045 len2, p->two->path);
4046 else if (p->two->mode == 0)
4047 len1 = snprintf(buffer, sizeof(buffer),
4048 "diff--gita/%.*sb/%.*s"
4049 "deletedfilemode%06o"
4050 "---a/%.*s"
4051 "+++/dev/null",
4052 len1, p->one->path,
4053 len2, p->two->path,
4054 p->one->mode,
4055 len1, p->one->path);
4056 else
4057 len1 = snprintf(buffer, sizeof(buffer),
4058 "diff--gita/%.*sb/%.*s"
4059 "---a/%.*s"
4060 "+++b/%.*s",
4061 len1, p->one->path,
4062 len2, p->two->path,
4063 len1, p->one->path,
4064 len2, p->two->path);
4065 git_SHA1_Update(&ctx, buffer, len1);
4066
4067 if (diff_filespec_is_binary(p->one) ||
4068 diff_filespec_is_binary(p->two)) {
4069 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4070 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4071 continue;
4072 }
4073
4074 xpp.flags = 0;
4075 xecfg.ctxlen = 3;
4076 xecfg.flags = 0;
4077 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4078 &xpp, &xecfg);
4079 }
4080
4081 git_SHA1_Final(sha1, &ctx);
4082 return 0;
4083 }
4084
4085 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4086 {
4087 struct diff_queue_struct *q = &diff_queued_diff;
4088 int i;
4089 int result = diff_get_patch_id(options, sha1);
4090
4091 for (i = 0; i < q->nr; i++)
4092 diff_free_filepair(q->queue[i]);
4093
4094 free(q->queue);
4095 DIFF_QUEUE_CLEAR(q);
4096
4097 return result;
4098 }
4099
4100 static int is_summary_empty(const struct diff_queue_struct *q)
4101 {
4102 int i;
4103
4104 for (i = 0; i < q->nr; i++) {
4105 const struct diff_filepair *p = q->queue[i];
4106
4107 switch (p->status) {
4108 case DIFF_STATUS_DELETED:
4109 case DIFF_STATUS_ADDED:
4110 case DIFF_STATUS_COPIED:
4111 case DIFF_STATUS_RENAMED:
4112 return 0;
4113 default:
4114 if (p->score)
4115 return 0;
4116 if (p->one->mode && p->two->mode &&
4117 p->one->mode != p->two->mode)
4118 return 0;
4119 break;
4120 }
4121 }
4122 return 1;
4123 }
4124
4125 static const char rename_limit_warning[] =
4126 "inexact rename detection was skipped due to too many files.";
4127
4128 static const char degrade_cc_to_c_warning[] =
4129 "only found copies from modified paths due to too many files.";
4130
4131 static const char rename_limit_advice[] =
4132 "you may want to set your %s variable to at least "
4133 "%d and retry the command.";
4134
4135 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4136 {
4137 if (degraded_cc)
4138 warning(degrade_cc_to_c_warning);
4139 else if (needed)
4140 warning(rename_limit_warning);
4141 else
4142 return;
4143 if (0 < needed && needed < 32767)
4144 warning(rename_limit_advice, varname, needed);
4145 }
4146
4147 void diff_flush(struct diff_options *options)
4148 {
4149 struct diff_queue_struct *q = &diff_queued_diff;
4150 int i, output_format = options->output_format;
4151 int separator = 0;
4152 int dirstat_by_line = 0;
4153
4154 /*
4155 * Order: raw, stat, summary, patch
4156 * or: name/name-status/checkdiff (other bits clear)
4157 */
4158 if (!q->nr)
4159 goto free_queue;
4160
4161 if (output_format & (DIFF_FORMAT_RAW |
4162 DIFF_FORMAT_NAME |
4163 DIFF_FORMAT_NAME_STATUS |
4164 DIFF_FORMAT_CHECKDIFF)) {
4165 for (i = 0; i < q->nr; i++) {
4166 struct diff_filepair *p = q->queue[i];
4167 if (check_pair_status(p))
4168 flush_one_pair(p, options);
4169 }
4170 separator++;
4171 }
4172
4173 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4174 dirstat_by_line = 1;
4175
4176 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4177 dirstat_by_line) {
4178 struct diffstat_t diffstat;
4179
4180 memset(&diffstat, 0, sizeof(struct diffstat_t));
4181 for (i = 0; i < q->nr; i++) {
4182 struct diff_filepair *p = q->queue[i];
4183 if (check_pair_status(p))
4184 diff_flush_stat(p, options, &diffstat);
4185 }
4186 if (output_format & DIFF_FORMAT_NUMSTAT)
4187 show_numstat(&diffstat, options);
4188 if (output_format & DIFF_FORMAT_DIFFSTAT)
4189 show_stats(&diffstat, options);
4190 if (output_format & DIFF_FORMAT_SHORTSTAT)
4191 show_shortstats(&diffstat, options);
4192 if (output_format & DIFF_FORMAT_DIRSTAT)
4193 show_dirstat_by_line(&diffstat, options);
4194 free_diffstat_info(&diffstat);
4195 separator++;
4196 }
4197 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4198 show_dirstat(options);
4199
4200 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4201 for (i = 0; i < q->nr; i++) {
4202 diff_summary(options, q->queue[i]);
4203 }
4204 separator++;
4205 }
4206
4207 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4208 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4209 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4210 /*
4211 * run diff_flush_patch for the exit status. setting
4212 * options->file to /dev/null should be safe, becaue we
4213 * aren't supposed to produce any output anyway.
4214 */
4215 if (options->close_file)
4216 fclose(options->file);
4217 options->file = fopen("/dev/null", "w");
4218 if (!options->file)
4219 die_errno("Could not open /dev/null");
4220 options->close_file = 1;
4221 for (i = 0; i < q->nr; i++) {
4222 struct diff_filepair *p = q->queue[i];
4223 if (check_pair_status(p))
4224 diff_flush_patch(p, options);
4225 if (options->found_changes)
4226 break;
4227 }
4228 }
4229
4230 if (output_format & DIFF_FORMAT_PATCH) {
4231 if (separator) {
4232 putc(options->line_termination, options->file);
4233 if (options->stat_sep) {
4234 /* attach patch instead of inline */
4235 fputs(options->stat_sep, options->file);
4236 }
4237 }
4238
4239 for (i = 0; i < q->nr; i++) {
4240 struct diff_filepair *p = q->queue[i];
4241 if (check_pair_status(p))
4242 diff_flush_patch(p, options);
4243 }
4244 }
4245
4246 if (output_format & DIFF_FORMAT_CALLBACK)
4247 options->format_callback(q, options, options->format_callback_data);
4248
4249 for (i = 0; i < q->nr; i++)
4250 diff_free_filepair(q->queue[i]);
4251 free_queue:
4252 free(q->queue);
4253 DIFF_QUEUE_CLEAR(q);
4254 if (options->close_file)
4255 fclose(options->file);
4256
4257 /*
4258 * Report the content-level differences with HAS_CHANGES;
4259 * diff_addremove/diff_change does not set the bit when
4260 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4261 */
4262 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4263 if (options->found_changes)
4264 DIFF_OPT_SET(options, HAS_CHANGES);
4265 else
4266 DIFF_OPT_CLR(options, HAS_CHANGES);
4267 }
4268 }
4269
4270 static void diffcore_apply_filter(const char *filter)
4271 {
4272 int i;
4273 struct diff_queue_struct *q = &diff_queued_diff;
4274 struct diff_queue_struct outq;
4275 DIFF_QUEUE_CLEAR(&outq);
4276
4277 if (!filter)
4278 return;
4279
4280 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4281 int found;
4282 for (i = found = 0; !found && i < q->nr; i++) {
4283 struct diff_filepair *p = q->queue[i];
4284 if (((p->status == DIFF_STATUS_MODIFIED) &&
4285 ((p->score &&
4286 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4287 (!p->score &&
4288 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4289 ((p->status != DIFF_STATUS_MODIFIED) &&
4290 strchr(filter, p->status)))
4291 found++;
4292 }
4293 if (found)
4294 return;
4295
4296 /* otherwise we will clear the whole queue
4297 * by copying the empty outq at the end of this
4298 * function, but first clear the current entries
4299 * in the queue.
4300 */
4301 for (i = 0; i < q->nr; i++)
4302 diff_free_filepair(q->queue[i]);
4303 }
4304 else {
4305 /* Only the matching ones */
4306 for (i = 0; i < q->nr; i++) {
4307 struct diff_filepair *p = q->queue[i];
4308
4309 if (((p->status == DIFF_STATUS_MODIFIED) &&
4310 ((p->score &&
4311 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4312 (!p->score &&
4313 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4314 ((p->status != DIFF_STATUS_MODIFIED) &&
4315 strchr(filter, p->status)))
4316 diff_q(&outq, p);
4317 else
4318 diff_free_filepair(p);
4319 }
4320 }
4321 free(q->queue);
4322 *q = outq;
4323 }
4324
4325 /* Check whether two filespecs with the same mode and size are identical */
4326 static int diff_filespec_is_identical(struct diff_filespec *one,
4327 struct diff_filespec *two)
4328 {
4329 if (S_ISGITLINK(one->mode))
4330 return 0;
4331 if (diff_populate_filespec(one, 0))
4332 return 0;
4333 if (diff_populate_filespec(two, 0))
4334 return 0;
4335 return !memcmp(one->data, two->data, one->size);
4336 }
4337
4338 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4339 {
4340 int i;
4341 struct diff_queue_struct *q = &diff_queued_diff;
4342 struct diff_queue_struct outq;
4343 DIFF_QUEUE_CLEAR(&outq);
4344
4345 for (i = 0; i < q->nr; i++) {
4346 struct diff_filepair *p = q->queue[i];
4347
4348 /*
4349 * 1. Entries that come from stat info dirtiness
4350 * always have both sides (iow, not create/delete),
4351 * one side of the object name is unknown, with
4352 * the same mode and size. Keep the ones that
4353 * do not match these criteria. They have real
4354 * differences.
4355 *
4356 * 2. At this point, the file is known to be modified,
4357 * with the same mode and size, and the object
4358 * name of one side is unknown. Need to inspect
4359 * the identical contents.
4360 */
4361 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4362 !DIFF_FILE_VALID(p->two) ||
4363 (p->one->sha1_valid && p->two->sha1_valid) ||
4364 (p->one->mode != p->two->mode) ||
4365 diff_populate_filespec(p->one, 1) ||
4366 diff_populate_filespec(p->two, 1) ||
4367 (p->one->size != p->two->size) ||
4368 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4369 diff_q(&outq, p);
4370 else {
4371 /*
4372 * The caller can subtract 1 from skip_stat_unmatch
4373 * to determine how many paths were dirty only
4374 * due to stat info mismatch.
4375 */
4376 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4377 diffopt->skip_stat_unmatch++;
4378 diff_free_filepair(p);
4379 }
4380 }
4381 free(q->queue);
4382 *q = outq;
4383 }
4384
4385 static int diffnamecmp(const void *a_, const void *b_)
4386 {
4387 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4388 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4389 const char *name_a, *name_b;
4390
4391 name_a = a->one ? a->one->path : a->two->path;
4392 name_b = b->one ? b->one->path : b->two->path;
4393 return strcmp(name_a, name_b);
4394 }
4395
4396 void diffcore_fix_diff_index(struct diff_options *options)
4397 {
4398 struct diff_queue_struct *q = &diff_queued_diff;
4399 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4400 }
4401
4402 void diffcore_std(struct diff_options *options)
4403 {
4404 if (options->skip_stat_unmatch)
4405 diffcore_skip_stat_unmatch(options);
4406 if (!options->found_follow) {
4407 /* See try_to_follow_renames() in tree-diff.c */
4408 if (options->break_opt != -1)
4409 diffcore_break(options->break_opt);
4410 if (options->detect_rename)
4411 diffcore_rename(options);
4412 if (options->break_opt != -1)
4413 diffcore_merge_broken();
4414 }
4415 if (options->pickaxe)
4416 diffcore_pickaxe(options);
4417 if (options->orderfile)
4418 diffcore_order(options->orderfile);
4419 if (!options->found_follow)
4420 /* See try_to_follow_renames() in tree-diff.c */
4421 diff_resolve_rename_copy();
4422 diffcore_apply_filter(options->filter);
4423
4424 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4425 DIFF_OPT_SET(options, HAS_CHANGES);
4426 else
4427 DIFF_OPT_CLR(options, HAS_CHANGES);
4428
4429 options->found_follow = 0;
4430 }
4431
4432 int diff_result_code(struct diff_options *opt, int status)
4433 {
4434 int result = 0;
4435
4436 diff_warn_rename_limit("diff.renamelimit",
4437 opt->needed_rename_limit,
4438 opt->degraded_cc_to_c);
4439 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4440 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4441 return status;
4442 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4443 DIFF_OPT_TST(opt, HAS_CHANGES))
4444 result |= 01;
4445 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4446 DIFF_OPT_TST(opt, CHECK_FAILED))
4447 result |= 02;
4448 return result;
4449 }
4450
4451 /*
4452 * Shall changes to this submodule be ignored?
4453 *
4454 * Submodule changes can be configured to be ignored separately for each path,
4455 * but that configuration can be overridden from the command line.
4456 */
4457 static int is_submodule_ignored(const char *path, struct diff_options *options)
4458 {
4459 int ignored = 0;
4460 unsigned orig_flags = options->flags;
4461 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4462 set_diffopt_flags_from_submodule_config(options, path);
4463 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4464 ignored = 1;
4465 options->flags = orig_flags;
4466 return ignored;
4467 }
4468
4469 void diff_addremove(struct diff_options *options,
4470 int addremove, unsigned mode,
4471 const unsigned char *sha1,
4472 const char *concatpath, unsigned dirty_submodule)
4473 {
4474 struct diff_filespec *one, *two;
4475
4476 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4477 return;
4478
4479 /* This may look odd, but it is a preparation for
4480 * feeding "there are unchanged files which should
4481 * not produce diffs, but when you are doing copy
4482 * detection you would need them, so here they are"
4483 * entries to the diff-core. They will be prefixed
4484 * with something like '=' or '*' (I haven't decided
4485 * which but should not make any difference).
4486 * Feeding the same new and old to diff_change()
4487 * also has the same effect.
4488 * Before the final output happens, they are pruned after
4489 * merged into rename/copy pairs as appropriate.
4490 */
4491 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4492 addremove = (addremove == '+' ? '-' :
4493 addremove == '-' ? '+' : addremove);
4494
4495 if (options->prefix &&
4496 strncmp(concatpath, options->prefix, options->prefix_length))
4497 return;
4498
4499 one = alloc_filespec(concatpath);
4500 two = alloc_filespec(concatpath);
4501
4502 if (addremove != '+')
4503 fill_filespec(one, sha1, mode);
4504 if (addremove != '-') {
4505 fill_filespec(two, sha1, mode);
4506 two->dirty_submodule = dirty_submodule;
4507 }
4508
4509 diff_queue(&diff_queued_diff, one, two);
4510 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4511 DIFF_OPT_SET(options, HAS_CHANGES);
4512 }
4513
4514 void diff_change(struct diff_options *options,
4515 unsigned old_mode, unsigned new_mode,
4516 const unsigned char *old_sha1,
4517 const unsigned char *new_sha1,
4518 const char *concatpath,
4519 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4520 {
4521 struct diff_filespec *one, *two;
4522
4523 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4524 is_submodule_ignored(concatpath, options))
4525 return;
4526
4527 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4528 unsigned tmp;
4529 const unsigned char *tmp_c;
4530 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4531 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4532 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4533 new_dirty_submodule = tmp;
4534 }
4535
4536 if (options->prefix &&
4537 strncmp(concatpath, options->prefix, options->prefix_length))
4538 return;
4539
4540 one = alloc_filespec(concatpath);
4541 two = alloc_filespec(concatpath);
4542 fill_filespec(one, old_sha1, old_mode);
4543 fill_filespec(two, new_sha1, new_mode);
4544 one->dirty_submodule = old_dirty_submodule;
4545 two->dirty_submodule = new_dirty_submodule;
4546
4547 diff_queue(&diff_queued_diff, one, two);
4548 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4549 DIFF_OPT_SET(options, HAS_CHANGES);
4550 }
4551
4552 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4553 {
4554 struct diff_filepair *pair;
4555 struct diff_filespec *one, *two;
4556
4557 if (options->prefix &&
4558 strncmp(path, options->prefix, options->prefix_length))
4559 return NULL;
4560
4561 one = alloc_filespec(path);
4562 two = alloc_filespec(path);
4563 pair = diff_queue(&diff_queued_diff, one, two);
4564 pair->is_unmerged = 1;
4565 return pair;
4566 }
4567
4568 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4569 size_t *outsize)
4570 {
4571 struct diff_tempfile *temp;
4572 const char *argv[3];
4573 const char **arg = argv;
4574 struct child_process child;
4575 struct strbuf buf = STRBUF_INIT;
4576 int err = 0;
4577
4578 temp = prepare_temp_file(spec->path, spec);
4579 *arg++ = pgm;
4580 *arg++ = temp->name;
4581 *arg = NULL;
4582
4583 memset(&child, 0, sizeof(child));
4584 child.use_shell = 1;
4585 child.argv = argv;
4586 child.out = -1;
4587 if (start_command(&child)) {
4588 remove_tempfile();
4589 return NULL;
4590 }
4591
4592 if (strbuf_read(&buf, child.out, 0) < 0)
4593 err = error("error reading from textconv command '%s'", pgm);
4594 close(child.out);
4595
4596 if (finish_command(&child) || err) {
4597 strbuf_release(&buf);
4598 remove_tempfile();
4599 return NULL;
4600 }
4601 remove_tempfile();
4602
4603 return strbuf_detach(&buf, outsize);
4604 }
4605
4606 size_t fill_textconv(struct userdiff_driver *driver,
4607 struct diff_filespec *df,
4608 char **outbuf)
4609 {
4610 size_t size;
4611
4612 if (!driver || !driver->textconv) {
4613 if (!DIFF_FILE_VALID(df)) {
4614 *outbuf = "";
4615 return 0;
4616 }
4617 if (diff_populate_filespec(df, 0))
4618 die("unable to read files to diff");
4619 *outbuf = df->data;
4620 return df->size;
4621 }
4622
4623 if (driver->textconv_cache && df->sha1_valid) {
4624 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4625 &size);
4626 if (*outbuf)
4627 return size;
4628 }
4629
4630 *outbuf = run_textconv(driver->textconv, df, &size);
4631 if (!*outbuf)
4632 die("unable to read files to diff");
4633
4634 if (driver->textconv_cache && df->sha1_valid) {
4635 /* ignore errors, as we might be in a readonly repository */
4636 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4637 size);
4638 /*
4639 * we could save up changes and flush them all at the end,
4640 * but we would need an extra call after all diffing is done.
4641 * Since generating a cache entry is the slow path anyway,
4642 * this extra overhead probably isn't a big deal.
4643 */
4644 notes_cache_write(driver->textconv_cache);
4645 }
4646
4647 return size;
4648 }
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