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CodingGuidelines: add a note to help contributors catch some errors earlier.
[git/ydirson.git] / diff.c
blob5422c438826254f36d1e00af0e8b882690661276
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 = 200;
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 struct diff_options default_diff_options;
35
36 static char diff_colors[][COLOR_MAXLEN] = {
37 GIT_COLOR_RESET,
38 GIT_COLOR_NORMAL, /* PLAIN */
39 GIT_COLOR_BOLD, /* METAINFO */
40 GIT_COLOR_CYAN, /* FRAGINFO */
41 GIT_COLOR_RED, /* OLD */
42 GIT_COLOR_GREEN, /* NEW */
43 GIT_COLOR_YELLOW, /* COMMIT */
44 GIT_COLOR_BG_RED, /* WHITESPACE */
45 GIT_COLOR_NORMAL, /* FUNCINFO */
46 };
47
48 static int parse_diff_color_slot(const char *var, int ofs)
49 {
50 if (!strcasecmp(var+ofs, "plain"))
51 return DIFF_PLAIN;
52 if (!strcasecmp(var+ofs, "meta"))
53 return DIFF_METAINFO;
54 if (!strcasecmp(var+ofs, "frag"))
55 return DIFF_FRAGINFO;
56 if (!strcasecmp(var+ofs, "old"))
57 return DIFF_FILE_OLD;
58 if (!strcasecmp(var+ofs, "new"))
59 return DIFF_FILE_NEW;
60 if (!strcasecmp(var+ofs, "commit"))
61 return DIFF_COMMIT;
62 if (!strcasecmp(var+ofs, "whitespace"))
63 return DIFF_WHITESPACE;
64 if (!strcasecmp(var+ofs, "func"))
65 return DIFF_FUNCINFO;
66 return -1;
67 }
68
69 static int git_config_rename(const char *var, const char *value)
70 {
71 if (!value)
72 return DIFF_DETECT_RENAME;
73 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
74 return DIFF_DETECT_COPY;
75 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
76 }
77
78 /*
79 * These are to give UI layer defaults.
80 * The core-level commands such as git-diff-files should
81 * never be affected by the setting of diff.renames
82 * the user happens to have in the configuration file.
83 */
84 int git_diff_ui_config(const char *var, const char *value, void *cb)
85 {
86 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
87 diff_use_color_default = git_config_colorbool(var, value, -1);
88 return 0;
89 }
90 if (!strcmp(var, "diff.renames")) {
91 diff_detect_rename_default = git_config_rename(var, value);
92 return 0;
93 }
94 if (!strcmp(var, "diff.autorefreshindex")) {
95 diff_auto_refresh_index = git_config_bool(var, value);
96 return 0;
97 }
98 if (!strcmp(var, "diff.mnemonicprefix")) {
99 diff_mnemonic_prefix = git_config_bool(var, value);
100 return 0;
101 }
102 if (!strcmp(var, "diff.noprefix")) {
103 diff_no_prefix = git_config_bool(var, value);
104 return 0;
105 }
106 if (!strcmp(var, "diff.external"))
107 return git_config_string(&external_diff_cmd_cfg, var, value);
108 if (!strcmp(var, "diff.wordregex"))
109 return git_config_string(&diff_word_regex_cfg, var, value);
110
111 if (!strcmp(var, "diff.ignoresubmodules"))
112 handle_ignore_submodules_arg(&default_diff_options, value);
113
114 return git_diff_basic_config(var, value, cb);
115 }
116
117 int git_diff_basic_config(const char *var, const char *value, void *cb)
118 {
119 if (!strcmp(var, "diff.renamelimit")) {
120 diff_rename_limit_default = git_config_int(var, value);
121 return 0;
122 }
123
124 switch (userdiff_config(var, value)) {
125 case 0: break;
126 case -1: return -1;
127 default: return 0;
128 }
129
130 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
131 int slot = parse_diff_color_slot(var, 11);
132 if (slot < 0)
133 return 0;
134 if (!value)
135 return config_error_nonbool(var);
136 color_parse(value, var, diff_colors[slot]);
137 return 0;
138 }
139
140 /* like GNU diff's --suppress-blank-empty option */
141 if (!strcmp(var, "diff.suppressblankempty") ||
142 /* for backwards compatibility */
143 !strcmp(var, "diff.suppress-blank-empty")) {
144 diff_suppress_blank_empty = git_config_bool(var, value);
145 return 0;
146 }
147
148 if (!prefixcmp(var, "submodule."))
149 return parse_submodule_config_option(var, value);
150
151 return git_color_default_config(var, value, cb);
152 }
153
154 static char *quote_two(const char *one, const char *two)
155 {
156 int need_one = quote_c_style(one, NULL, NULL, 1);
157 int need_two = quote_c_style(two, NULL, NULL, 1);
158 struct strbuf res = STRBUF_INIT;
159
160 if (need_one + need_two) {
161 strbuf_addch(&res, '"');
162 quote_c_style(one, &res, NULL, 1);
163 quote_c_style(two, &res, NULL, 1);
164 strbuf_addch(&res, '"');
165 } else {
166 strbuf_addstr(&res, one);
167 strbuf_addstr(&res, two);
168 }
169 return strbuf_detach(&res, NULL);
170 }
171
172 static const char *external_diff(void)
173 {
174 static const char *external_diff_cmd = NULL;
175 static int done_preparing = 0;
176
177 if (done_preparing)
178 return external_diff_cmd;
179 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
180 if (!external_diff_cmd)
181 external_diff_cmd = external_diff_cmd_cfg;
182 done_preparing = 1;
183 return external_diff_cmd;
184 }
185
186 static struct diff_tempfile {
187 const char *name; /* filename external diff should read from */
188 char hex[41];
189 char mode[10];
190 char tmp_path[PATH_MAX];
191 } diff_temp[2];
192
193 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
194
195 struct emit_callback {
196 int color_diff;
197 unsigned ws_rule;
198 int blank_at_eof_in_preimage;
199 int blank_at_eof_in_postimage;
200 int lno_in_preimage;
201 int lno_in_postimage;
202 sane_truncate_fn truncate;
203 const char **label_path;
204 struct diff_words_data *diff_words;
205 struct diff_options *opt;
206 int *found_changesp;
207 struct strbuf *header;
208 };
209
210 static int count_lines(const char *data, int size)
211 {
212 int count, ch, completely_empty = 1, nl_just_seen = 0;
213 count = 0;
214 while (0 < size--) {
215 ch = *data++;
216 if (ch == '\n') {
217 count++;
218 nl_just_seen = 1;
219 completely_empty = 0;
220 }
221 else {
222 nl_just_seen = 0;
223 completely_empty = 0;
224 }
225 }
226 if (completely_empty)
227 return 0;
228 if (!nl_just_seen)
229 count++; /* no trailing newline */
230 return count;
231 }
232
233 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
234 {
235 if (!DIFF_FILE_VALID(one)) {
236 mf->ptr = (char *)""; /* does not matter */
237 mf->size = 0;
238 return 0;
239 }
240 else if (diff_populate_filespec(one, 0))
241 return -1;
242
243 mf->ptr = one->data;
244 mf->size = one->size;
245 return 0;
246 }
247
248 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
249 {
250 char *ptr = mf->ptr;
251 long size = mf->size;
252 int cnt = 0;
253
254 if (!size)
255 return cnt;
256 ptr += size - 1; /* pointing at the very end */
257 if (*ptr != '\n')
258 ; /* incomplete line */
259 else
260 ptr--; /* skip the last LF */
261 while (mf->ptr < ptr) {
262 char *prev_eol;
263 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
264 if (*prev_eol == '\n')
265 break;
266 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
267 break;
268 cnt++;
269 ptr = prev_eol - 1;
270 }
271 return cnt;
272 }
273
274 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
275 struct emit_callback *ecbdata)
276 {
277 int l1, l2, at;
278 unsigned ws_rule = ecbdata->ws_rule;
279 l1 = count_trailing_blank(mf1, ws_rule);
280 l2 = count_trailing_blank(mf2, ws_rule);
281 if (l2 <= l1) {
282 ecbdata->blank_at_eof_in_preimage = 0;
283 ecbdata->blank_at_eof_in_postimage = 0;
284 return;
285 }
286 at = count_lines(mf1->ptr, mf1->size);
287 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
288
289 at = count_lines(mf2->ptr, mf2->size);
290 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
291 }
292
293 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
294 int first, const char *line, int len)
295 {
296 int has_trailing_newline, has_trailing_carriage_return;
297 int nofirst;
298 FILE *file = o->file;
299
300 if (o->output_prefix) {
301 struct strbuf *msg = NULL;
302 msg = o->output_prefix(o, o->output_prefix_data);
303 assert(msg);
304 fwrite(msg->buf, msg->len, 1, file);
305 }
306
307 if (len == 0) {
308 has_trailing_newline = (first == '\n');
309 has_trailing_carriage_return = (!has_trailing_newline &&
310 (first == '\r'));
311 nofirst = has_trailing_newline || has_trailing_carriage_return;
312 } else {
313 has_trailing_newline = (len > 0 && line[len-1] == '\n');
314 if (has_trailing_newline)
315 len--;
316 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
317 if (has_trailing_carriage_return)
318 len--;
319 nofirst = 0;
320 }
321
322 if (len || !nofirst) {
323 fputs(set, file);
324 if (!nofirst)
325 fputc(first, file);
326 fwrite(line, len, 1, file);
327 fputs(reset, file);
328 }
329 if (has_trailing_carriage_return)
330 fputc('\r', file);
331 if (has_trailing_newline)
332 fputc('\n', file);
333 }
334
335 static void emit_line(struct diff_options *o, const char *set, const char *reset,
336 const char *line, int len)
337 {
338 emit_line_0(o, set, reset, line[0], line+1, len-1);
339 }
340
341 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
342 {
343 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
344 ecbdata->blank_at_eof_in_preimage &&
345 ecbdata->blank_at_eof_in_postimage &&
346 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
347 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
348 return 0;
349 return ws_blank_line(line, len, ecbdata->ws_rule);
350 }
351
352 static void emit_add_line(const char *reset,
353 struct emit_callback *ecbdata,
354 const char *line, int len)
355 {
356 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
357 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
358
359 if (!*ws)
360 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
361 else if (new_blank_line_at_eof(ecbdata, line, len))
362 /* Blank line at EOF - paint '+' as well */
363 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
364 else {
365 /* Emit just the prefix, then the rest. */
366 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
367 ws_check_emit(line, len, ecbdata->ws_rule,
368 ecbdata->opt->file, set, reset, ws);
369 }
370 }
371
372 static void emit_hunk_header(struct emit_callback *ecbdata,
373 const char *line, int len)
374 {
375 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
376 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
377 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
378 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
379 static const char atat[2] = { '@', '@' };
380 const char *cp, *ep;
381 struct strbuf msgbuf = STRBUF_INIT;
382 int org_len = len;
383 int i = 1;
384
385 /*
386 * As a hunk header must begin with "@@ -<old>, +<new> @@",
387 * it always is at least 10 bytes long.
388 */
389 if (len < 10 ||
390 memcmp(line, atat, 2) ||
391 !(ep = memmem(line + 2, len - 2, atat, 2))) {
392 emit_line(ecbdata->opt, plain, reset, line, len);
393 return;
394 }
395 ep += 2; /* skip over @@ */
396
397 /* The hunk header in fraginfo color */
398 strbuf_add(&msgbuf, frag, strlen(frag));
399 strbuf_add(&msgbuf, line, ep - line);
400 strbuf_add(&msgbuf, reset, strlen(reset));
401
402 /*
403 * trailing "\r\n"
404 */
405 for ( ; i < 3; i++)
406 if (line[len - i] == '\r' || line[len - i] == '\n')
407 len--;
408
409 /* blank before the func header */
410 for (cp = ep; ep - line < len; ep++)
411 if (*ep != ' ' && *ep != '\t')
412 break;
413 if (ep != cp) {
414 strbuf_add(&msgbuf, plain, strlen(plain));
415 strbuf_add(&msgbuf, cp, ep - cp);
416 strbuf_add(&msgbuf, reset, strlen(reset));
417 }
418
419 if (ep < line + len) {
420 strbuf_add(&msgbuf, func, strlen(func));
421 strbuf_add(&msgbuf, ep, line + len - ep);
422 strbuf_add(&msgbuf, reset, strlen(reset));
423 }
424
425 strbuf_add(&msgbuf, line + len, org_len - len);
426 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
427 strbuf_release(&msgbuf);
428 }
429
430 static struct diff_tempfile *claim_diff_tempfile(void) {
431 int i;
432 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
433 if (!diff_temp[i].name)
434 return diff_temp + i;
435 die("BUG: diff is failing to clean up its tempfiles");
436 }
437
438 static int remove_tempfile_installed;
439
440 static void remove_tempfile(void)
441 {
442 int i;
443 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
444 if (diff_temp[i].name == diff_temp[i].tmp_path)
445 unlink_or_warn(diff_temp[i].name);
446 diff_temp[i].name = NULL;
447 }
448 }
449
450 static void remove_tempfile_on_signal(int signo)
451 {
452 remove_tempfile();
453 sigchain_pop(signo);
454 raise(signo);
455 }
456
457 static void print_line_count(FILE *file, int count)
458 {
459 switch (count) {
460 case 0:
461 fprintf(file, "0,0");
462 break;
463 case 1:
464 fprintf(file, "1");
465 break;
466 default:
467 fprintf(file, "1,%d", count);
468 break;
469 }
470 }
471
472 static void emit_rewrite_lines(struct emit_callback *ecb,
473 int prefix, const char *data, int size)
474 {
475 const char *endp = NULL;
476 static const char *nneof = " No newline at end of file\n";
477 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
478 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
479
480 while (0 < size) {
481 int len;
482
483 endp = memchr(data, '\n', size);
484 len = endp ? (endp - data + 1) : size;
485 if (prefix != '+') {
486 ecb->lno_in_preimage++;
487 emit_line_0(ecb->opt, old, reset, '-',
488 data, len);
489 } else {
490 ecb->lno_in_postimage++;
491 emit_add_line(reset, ecb, data, len);
492 }
493 size -= len;
494 data += len;
495 }
496 if (!endp) {
497 const char *plain = diff_get_color(ecb->color_diff,
498 DIFF_PLAIN);
499 emit_line_0(ecb->opt, plain, reset, '\\',
500 nneof, strlen(nneof));
501 }
502 }
503
504 static void emit_rewrite_diff(const char *name_a,
505 const char *name_b,
506 struct diff_filespec *one,
507 struct diff_filespec *two,
508 struct userdiff_driver *textconv_one,
509 struct userdiff_driver *textconv_two,
510 struct diff_options *o)
511 {
512 int lc_a, lc_b;
513 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
514 const char *name_a_tab, *name_b_tab;
515 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
516 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
517 const char *reset = diff_get_color(color_diff, DIFF_RESET);
518 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
519 const char *a_prefix, *b_prefix;
520 char *data_one, *data_two;
521 size_t size_one, size_two;
522 struct emit_callback ecbdata;
523 char *line_prefix = "";
524 struct strbuf *msgbuf;
525
526 if (o && o->output_prefix) {
527 msgbuf = o->output_prefix(o, o->output_prefix_data);
528 line_prefix = msgbuf->buf;
529 }
530
531 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
532 a_prefix = o->b_prefix;
533 b_prefix = o->a_prefix;
534 } else {
535 a_prefix = o->a_prefix;
536 b_prefix = o->b_prefix;
537 }
538
539 name_a += (*name_a == '/');
540 name_b += (*name_b == '/');
541 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
542 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
543
544 strbuf_reset(&a_name);
545 strbuf_reset(&b_name);
546 quote_two_c_style(&a_name, a_prefix, name_a, 0);
547 quote_two_c_style(&b_name, b_prefix, name_b, 0);
548
549 size_one = fill_textconv(textconv_one, one, &data_one);
550 size_two = fill_textconv(textconv_two, two, &data_two);
551
552 memset(&ecbdata, 0, sizeof(ecbdata));
553 ecbdata.color_diff = color_diff;
554 ecbdata.found_changesp = &o->found_changes;
555 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
556 ecbdata.opt = o;
557 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
558 mmfile_t mf1, mf2;
559 mf1.ptr = (char *)data_one;
560 mf2.ptr = (char *)data_two;
561 mf1.size = size_one;
562 mf2.size = size_two;
563 check_blank_at_eof(&mf1, &mf2, &ecbdata);
564 }
565 ecbdata.lno_in_preimage = 1;
566 ecbdata.lno_in_postimage = 1;
567
568 lc_a = count_lines(data_one, size_one);
569 lc_b = count_lines(data_two, size_two);
570 fprintf(o->file,
571 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
572 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
573 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
574 line_prefix, fraginfo);
575 print_line_count(o->file, lc_a);
576 fprintf(o->file, " +");
577 print_line_count(o->file, lc_b);
578 fprintf(o->file, " @@%s\n", reset);
579 if (lc_a)
580 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
581 if (lc_b)
582 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
583 if (textconv_one)
584 free((char *)data_one);
585 if (textconv_two)
586 free((char *)data_two);
587 }
588
589 struct diff_words_buffer {
590 mmfile_t text;
591 long alloc;
592 struct diff_words_orig {
593 const char *begin, *end;
594 } *orig;
595 int orig_nr, orig_alloc;
596 };
597
598 static void diff_words_append(char *line, unsigned long len,
599 struct diff_words_buffer *buffer)
600 {
601 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
602 line++;
603 len--;
604 memcpy(buffer->text.ptr + buffer->text.size, line, len);
605 buffer->text.size += len;
606 buffer->text.ptr[buffer->text.size] = '\0';
607 }
608
609 struct diff_words_style_elem
610 {
611 const char *prefix;
612 const char *suffix;
613 const char *color; /* NULL; filled in by the setup code if
614 * color is enabled */
615 };
616
617 struct diff_words_style
618 {
619 enum diff_words_type type;
620 struct diff_words_style_elem new, old, ctx;
621 const char *newline;
622 };
623
624 struct diff_words_style diff_words_styles[] = {
625 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
626 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
627 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
628 };
629
630 struct diff_words_data {
631 struct diff_words_buffer minus, plus;
632 const char *current_plus;
633 int last_minus;
634 struct diff_options *opt;
635 regex_t *word_regex;
636 enum diff_words_type type;
637 struct diff_words_style *style;
638 };
639
640 static int fn_out_diff_words_write_helper(FILE *fp,
641 struct diff_words_style_elem *st_el,
642 const char *newline,
643 size_t count, const char *buf,
644 const char *line_prefix)
645 {
646 int print = 0;
647
648 while (count) {
649 char *p = memchr(buf, '\n', count);
650 if (print)
651 fputs(line_prefix, fp);
652 if (p != buf) {
653 if (st_el->color && fputs(st_el->color, fp) < 0)
654 return -1;
655 if (fputs(st_el->prefix, fp) < 0 ||
656 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
657 fputs(st_el->suffix, fp) < 0)
658 return -1;
659 if (st_el->color && *st_el->color
660 && fputs(GIT_COLOR_RESET, fp) < 0)
661 return -1;
662 }
663 if (!p)
664 return 0;
665 if (fputs(newline, fp) < 0)
666 return -1;
667 count -= p + 1 - buf;
668 buf = p + 1;
669 print = 1;
670 }
671 return 0;
672 }
673
674 /*
675 * '--color-words' algorithm can be described as:
676 *
677 * 1. collect a the minus/plus lines of a diff hunk, divided into
678 * minus-lines and plus-lines;
679 *
680 * 2. break both minus-lines and plus-lines into words and
681 * place them into two mmfile_t with one word for each line;
682 *
683 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
684 *
685 * And for the common parts of the both file, we output the plus side text.
686 * diff_words->current_plus is used to trace the current position of the plus file
687 * which printed. diff_words->last_minus is used to trace the last minus word
688 * printed.
689 *
690 * For '--graph' to work with '--color-words', we need to output the graph prefix
691 * on each line of color words output. Generally, there are two conditions on
692 * which we should output the prefix.
693 *
694 * 1. diff_words->last_minus == 0 &&
695 * diff_words->current_plus == diff_words->plus.text.ptr
696 *
697 * that is: the plus text must start as a new line, and if there is no minus
698 * word printed, a graph prefix must be printed.
699 *
700 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
701 * *(diff_words->current_plus - 1) == '\n'
702 *
703 * that is: a graph prefix must be printed following a '\n'
704 */
705 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
706 {
707 if ((diff_words->last_minus == 0 &&
708 diff_words->current_plus == diff_words->plus.text.ptr) ||
709 (diff_words->current_plus > diff_words->plus.text.ptr &&
710 *(diff_words->current_plus - 1) == '\n')) {
711 return 1;
712 } else {
713 return 0;
714 }
715 }
716
717 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
718 {
719 struct diff_words_data *diff_words = priv;
720 struct diff_words_style *style = diff_words->style;
721 int minus_first, minus_len, plus_first, plus_len;
722 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
723 struct diff_options *opt = diff_words->opt;
724 struct strbuf *msgbuf;
725 char *line_prefix = "";
726
727 if (line[0] != '@' || parse_hunk_header(line, len,
728 &minus_first, &minus_len, &plus_first, &plus_len))
729 return;
730
731 assert(opt);
732 if (opt->output_prefix) {
733 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
734 line_prefix = msgbuf->buf;
735 }
736
737 /* POSIX requires that first be decremented by one if len == 0... */
738 if (minus_len) {
739 minus_begin = diff_words->minus.orig[minus_first].begin;
740 minus_end =
741 diff_words->minus.orig[minus_first + minus_len - 1].end;
742 } else
743 minus_begin = minus_end =
744 diff_words->minus.orig[minus_first].end;
745
746 if (plus_len) {
747 plus_begin = diff_words->plus.orig[plus_first].begin;
748 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
749 } else
750 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
751
752 if (color_words_output_graph_prefix(diff_words)) {
753 fputs(line_prefix, diff_words->opt->file);
754 }
755 if (diff_words->current_plus != plus_begin) {
756 fn_out_diff_words_write_helper(diff_words->opt->file,
757 &style->ctx, style->newline,
758 plus_begin - diff_words->current_plus,
759 diff_words->current_plus, line_prefix);
760 if (*(plus_begin - 1) == '\n')
761 fputs(line_prefix, diff_words->opt->file);
762 }
763 if (minus_begin != minus_end) {
764 fn_out_diff_words_write_helper(diff_words->opt->file,
765 &style->old, style->newline,
766 minus_end - minus_begin, minus_begin,
767 line_prefix);
768 }
769 if (plus_begin != plus_end) {
770 fn_out_diff_words_write_helper(diff_words->opt->file,
771 &style->new, style->newline,
772 plus_end - plus_begin, plus_begin,
773 line_prefix);
774 }
775
776 diff_words->current_plus = plus_end;
777 diff_words->last_minus = minus_first;
778 }
779
780 /* This function starts looking at *begin, and returns 0 iff a word was found. */
781 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
782 int *begin, int *end)
783 {
784 if (word_regex && *begin < buffer->size) {
785 regmatch_t match[1];
786 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
787 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
788 '\n', match[0].rm_eo - match[0].rm_so);
789 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
790 *begin += match[0].rm_so;
791 return *begin >= *end;
792 }
793 return -1;
794 }
795
796 /* find the next word */
797 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
798 (*begin)++;
799 if (*begin >= buffer->size)
800 return -1;
801
802 /* find the end of the word */
803 *end = *begin + 1;
804 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
805 (*end)++;
806
807 return 0;
808 }
809
810 /*
811 * This function splits the words in buffer->text, stores the list with
812 * newline separator into out, and saves the offsets of the original words
813 * in buffer->orig.
814 */
815 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
816 regex_t *word_regex)
817 {
818 int i, j;
819 long alloc = 0;
820
821 out->size = 0;
822 out->ptr = NULL;
823
824 /* fake an empty "0th" word */
825 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
826 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
827 buffer->orig_nr = 1;
828
829 for (i = 0; i < buffer->text.size; i++) {
830 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
831 return;
832
833 /* store original boundaries */
834 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
835 buffer->orig_alloc);
836 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
837 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
838 buffer->orig_nr++;
839
840 /* store one word */
841 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
842 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
843 out->ptr[out->size + j - i] = '\n';
844 out->size += j - i + 1;
845
846 i = j - 1;
847 }
848 }
849
850 /* this executes the word diff on the accumulated buffers */
851 static void diff_words_show(struct diff_words_data *diff_words)
852 {
853 xpparam_t xpp;
854 xdemitconf_t xecfg;
855 mmfile_t minus, plus;
856 struct diff_words_style *style = diff_words->style;
857
858 struct diff_options *opt = diff_words->opt;
859 struct strbuf *msgbuf;
860 char *line_prefix = "";
861
862 assert(opt);
863 if (opt->output_prefix) {
864 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
865 line_prefix = msgbuf->buf;
866 }
867
868 /* special case: only removal */
869 if (!diff_words->plus.text.size) {
870 fputs(line_prefix, diff_words->opt->file);
871 fn_out_diff_words_write_helper(diff_words->opt->file,
872 &style->old, style->newline,
873 diff_words->minus.text.size,
874 diff_words->minus.text.ptr, line_prefix);
875 diff_words->minus.text.size = 0;
876 return;
877 }
878
879 diff_words->current_plus = diff_words->plus.text.ptr;
880 diff_words->last_minus = 0;
881
882 memset(&xpp, 0, sizeof(xpp));
883 memset(&xecfg, 0, sizeof(xecfg));
884 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
885 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
886 xpp.flags = 0;
887 /* as only the hunk header will be parsed, we need a 0-context */
888 xecfg.ctxlen = 0;
889 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
890 &xpp, &xecfg);
891 free(minus.ptr);
892 free(plus.ptr);
893 if (diff_words->current_plus != diff_words->plus.text.ptr +
894 diff_words->plus.text.size) {
895 if (color_words_output_graph_prefix(diff_words))
896 fputs(line_prefix, diff_words->opt->file);
897 fn_out_diff_words_write_helper(diff_words->opt->file,
898 &style->ctx, style->newline,
899 diff_words->plus.text.ptr + diff_words->plus.text.size
900 - diff_words->current_plus, diff_words->current_plus,
901 line_prefix);
902 }
903 diff_words->minus.text.size = diff_words->plus.text.size = 0;
904 }
905
906 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
907 static void diff_words_flush(struct emit_callback *ecbdata)
908 {
909 if (ecbdata->diff_words->minus.text.size ||
910 ecbdata->diff_words->plus.text.size)
911 diff_words_show(ecbdata->diff_words);
912 }
913
914 static void free_diff_words_data(struct emit_callback *ecbdata)
915 {
916 if (ecbdata->diff_words) {
917 diff_words_flush(ecbdata);
918 free (ecbdata->diff_words->minus.text.ptr);
919 free (ecbdata->diff_words->minus.orig);
920 free (ecbdata->diff_words->plus.text.ptr);
921 free (ecbdata->diff_words->plus.orig);
922 if (ecbdata->diff_words->word_regex) {
923 regfree(ecbdata->diff_words->word_regex);
924 free(ecbdata->diff_words->word_regex);
925 }
926 free(ecbdata->diff_words);
927 ecbdata->diff_words = NULL;
928 }
929 }
930
931 const char *diff_get_color(int diff_use_color, enum color_diff ix)
932 {
933 if (diff_use_color)
934 return diff_colors[ix];
935 return "";
936 }
937
938 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
939 {
940 const char *cp;
941 unsigned long allot;
942 size_t l = len;
943
944 if (ecb->truncate)
945 return ecb->truncate(line, len);
946 cp = line;
947 allot = l;
948 while (0 < l) {
949 (void) utf8_width(&cp, &l);
950 if (!cp)
951 break; /* truncated in the middle? */
952 }
953 return allot - l;
954 }
955
956 static void find_lno(const char *line, struct emit_callback *ecbdata)
957 {
958 const char *p;
959 ecbdata->lno_in_preimage = 0;
960 ecbdata->lno_in_postimage = 0;
961 p = strchr(line, '-');
962 if (!p)
963 return; /* cannot happen */
964 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
965 p = strchr(p, '+');
966 if (!p)
967 return; /* cannot happen */
968 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
969 }
970
971 static void fn_out_consume(void *priv, char *line, unsigned long len)
972 {
973 struct emit_callback *ecbdata = priv;
974 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
975 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
976 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
977 struct diff_options *o = ecbdata->opt;
978 char *line_prefix = "";
979 struct strbuf *msgbuf;
980
981 if (o && o->output_prefix) {
982 msgbuf = o->output_prefix(o, o->output_prefix_data);
983 line_prefix = msgbuf->buf;
984 }
985
986 if (ecbdata->header) {
987 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
988 strbuf_reset(ecbdata->header);
989 ecbdata->header = NULL;
990 }
991 *(ecbdata->found_changesp) = 1;
992
993 if (ecbdata->label_path[0]) {
994 const char *name_a_tab, *name_b_tab;
995
996 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
997 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
998
999 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1000 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1001 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1002 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1003 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1004 }
1005
1006 if (diff_suppress_blank_empty
1007 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1008 line[0] = '\n';
1009 len = 1;
1010 }
1011
1012 if (line[0] == '@') {
1013 if (ecbdata->diff_words)
1014 diff_words_flush(ecbdata);
1015 len = sane_truncate_line(ecbdata, line, len);
1016 find_lno(line, ecbdata);
1017 emit_hunk_header(ecbdata, line, len);
1018 if (line[len-1] != '\n')
1019 putc('\n', ecbdata->opt->file);
1020 return;
1021 }
1022
1023 if (len < 1) {
1024 emit_line(ecbdata->opt, reset, reset, line, len);
1025 if (ecbdata->diff_words
1026 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1027 fputs("~\n", ecbdata->opt->file);
1028 return;
1029 }
1030
1031 if (ecbdata->diff_words) {
1032 if (line[0] == '-') {
1033 diff_words_append(line, len,
1034 &ecbdata->diff_words->minus);
1035 return;
1036 } else if (line[0] == '+') {
1037 diff_words_append(line, len,
1038 &ecbdata->diff_words->plus);
1039 return;
1040 }
1041 diff_words_flush(ecbdata);
1042 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1043 emit_line(ecbdata->opt, plain, reset, line, len);
1044 fputs("~\n", ecbdata->opt->file);
1045 } else {
1046 /* don't print the prefix character */
1047 emit_line(ecbdata->opt, plain, reset, line+1, len-1);
1048 }
1049 return;
1050 }
1051
1052 if (line[0] != '+') {
1053 const char *color =
1054 diff_get_color(ecbdata->color_diff,
1055 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1056 ecbdata->lno_in_preimage++;
1057 if (line[0] == ' ')
1058 ecbdata->lno_in_postimage++;
1059 emit_line(ecbdata->opt, color, reset, line, len);
1060 } else {
1061 ecbdata->lno_in_postimage++;
1062 emit_add_line(reset, ecbdata, line + 1, len - 1);
1063 }
1064 }
1065
1066 static char *pprint_rename(const char *a, const char *b)
1067 {
1068 const char *old = a;
1069 const char *new = b;
1070 struct strbuf name = STRBUF_INIT;
1071 int pfx_length, sfx_length;
1072 int len_a = strlen(a);
1073 int len_b = strlen(b);
1074 int a_midlen, b_midlen;
1075 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1076 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1077
1078 if (qlen_a || qlen_b) {
1079 quote_c_style(a, &name, NULL, 0);
1080 strbuf_addstr(&name, " => ");
1081 quote_c_style(b, &name, NULL, 0);
1082 return strbuf_detach(&name, NULL);
1083 }
1084
1085 /* Find common prefix */
1086 pfx_length = 0;
1087 while (*old && *new && *old == *new) {
1088 if (*old == '/')
1089 pfx_length = old - a + 1;
1090 old++;
1091 new++;
1092 }
1093
1094 /* Find common suffix */
1095 old = a + len_a;
1096 new = b + len_b;
1097 sfx_length = 0;
1098 while (a <= old && b <= new && *old == *new) {
1099 if (*old == '/')
1100 sfx_length = len_a - (old - a);
1101 old--;
1102 new--;
1103 }
1104
1105 /*
1106 * pfx{mid-a => mid-b}sfx
1107 * {pfx-a => pfx-b}sfx
1108 * pfx{sfx-a => sfx-b}
1109 * name-a => name-b
1110 */
1111 a_midlen = len_a - pfx_length - sfx_length;
1112 b_midlen = len_b - pfx_length - sfx_length;
1113 if (a_midlen < 0)
1114 a_midlen = 0;
1115 if (b_midlen < 0)
1116 b_midlen = 0;
1117
1118 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1119 if (pfx_length + sfx_length) {
1120 strbuf_add(&name, a, pfx_length);
1121 strbuf_addch(&name, '{');
1122 }
1123 strbuf_add(&name, a + pfx_length, a_midlen);
1124 strbuf_addstr(&name, " => ");
1125 strbuf_add(&name, b + pfx_length, b_midlen);
1126 if (pfx_length + sfx_length) {
1127 strbuf_addch(&name, '}');
1128 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1129 }
1130 return strbuf_detach(&name, NULL);
1131 }
1132
1133 struct diffstat_t {
1134 int nr;
1135 int alloc;
1136 struct diffstat_file {
1137 char *from_name;
1138 char *name;
1139 char *print_name;
1140 unsigned is_unmerged:1;
1141 unsigned is_binary:1;
1142 unsigned is_renamed:1;
1143 uintmax_t added, deleted;
1144 } **files;
1145 };
1146
1147 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1148 const char *name_a,
1149 const char *name_b)
1150 {
1151 struct diffstat_file *x;
1152 x = xcalloc(sizeof (*x), 1);
1153 if (diffstat->nr == diffstat->alloc) {
1154 diffstat->alloc = alloc_nr(diffstat->alloc);
1155 diffstat->files = xrealloc(diffstat->files,
1156 diffstat->alloc * sizeof(x));
1157 }
1158 diffstat->files[diffstat->nr++] = x;
1159 if (name_b) {
1160 x->from_name = xstrdup(name_a);
1161 x->name = xstrdup(name_b);
1162 x->is_renamed = 1;
1163 }
1164 else {
1165 x->from_name = NULL;
1166 x->name = xstrdup(name_a);
1167 }
1168 return x;
1169 }
1170
1171 static void diffstat_consume(void *priv, char *line, unsigned long len)
1172 {
1173 struct diffstat_t *diffstat = priv;
1174 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1175
1176 if (line[0] == '+')
1177 x->added++;
1178 else if (line[0] == '-')
1179 x->deleted++;
1180 }
1181
1182 const char mime_boundary_leader[] = "------------";
1183
1184 static int scale_linear(int it, int width, int max_change)
1185 {
1186 /*
1187 * make sure that at least one '-' is printed if there were deletions,
1188 * and likewise for '+'.
1189 */
1190 if (max_change < 2)
1191 return it;
1192 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
1193 }
1194
1195 static void show_name(FILE *file,
1196 const char *prefix, const char *name, int len)
1197 {
1198 fprintf(file, " %s%-*s |", prefix, len, name);
1199 }
1200
1201 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1202 {
1203 if (cnt <= 0)
1204 return;
1205 fprintf(file, "%s", set);
1206 while (cnt--)
1207 putc(ch, file);
1208 fprintf(file, "%s", reset);
1209 }
1210
1211 static void fill_print_name(struct diffstat_file *file)
1212 {
1213 char *pname;
1214
1215 if (file->print_name)
1216 return;
1217
1218 if (!file->is_renamed) {
1219 struct strbuf buf = STRBUF_INIT;
1220 if (quote_c_style(file->name, &buf, NULL, 0)) {
1221 pname = strbuf_detach(&buf, NULL);
1222 } else {
1223 pname = file->name;
1224 strbuf_release(&buf);
1225 }
1226 } else {
1227 pname = pprint_rename(file->from_name, file->name);
1228 }
1229 file->print_name = pname;
1230 }
1231
1232 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1233 {
1234 int i, len, add, del, adds = 0, dels = 0;
1235 uintmax_t max_change = 0, max_len = 0;
1236 int total_files = data->nr;
1237 int width, name_width;
1238 const char *reset, *set, *add_c, *del_c;
1239 const char *line_prefix = "";
1240 struct strbuf *msg = NULL;
1241
1242 if (data->nr == 0)
1243 return;
1244
1245 if (options->output_prefix) {
1246 msg = options->output_prefix(options, options->output_prefix_data);
1247 line_prefix = msg->buf;
1248 }
1249
1250 width = options->stat_width ? options->stat_width : 80;
1251 name_width = options->stat_name_width ? options->stat_name_width : 50;
1252
1253 /* Sanity: give at least 5 columns to the graph,
1254 * but leave at least 10 columns for the name.
1255 */
1256 if (width < 25)
1257 width = 25;
1258 if (name_width < 10)
1259 name_width = 10;
1260 else if (width < name_width + 15)
1261 name_width = width - 15;
1262
1263 /* Find the longest filename and max number of changes */
1264 reset = diff_get_color_opt(options, DIFF_RESET);
1265 set = diff_get_color_opt(options, DIFF_PLAIN);
1266 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1267 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1268
1269 for (i = 0; i < data->nr; i++) {
1270 struct diffstat_file *file = data->files[i];
1271 uintmax_t change = file->added + file->deleted;
1272 fill_print_name(file);
1273 len = strlen(file->print_name);
1274 if (max_len < len)
1275 max_len = len;
1276
1277 if (file->is_binary || file->is_unmerged)
1278 continue;
1279 if (max_change < change)
1280 max_change = change;
1281 }
1282
1283 /* Compute the width of the graph part;
1284 * 10 is for one blank at the beginning of the line plus
1285 * " | count " between the name and the graph.
1286 *
1287 * From here on, name_width is the width of the name area,
1288 * and width is the width of the graph area.
1289 */
1290 name_width = (name_width < max_len) ? name_width : max_len;
1291 if (width < (name_width + 10) + max_change)
1292 width = width - (name_width + 10);
1293 else
1294 width = max_change;
1295
1296 for (i = 0; i < data->nr; i++) {
1297 const char *prefix = "";
1298 char *name = data->files[i]->print_name;
1299 uintmax_t added = data->files[i]->added;
1300 uintmax_t deleted = data->files[i]->deleted;
1301 int name_len;
1302
1303 /*
1304 * "scale" the filename
1305 */
1306 len = name_width;
1307 name_len = strlen(name);
1308 if (name_width < name_len) {
1309 char *slash;
1310 prefix = "...";
1311 len -= 3;
1312 name += name_len - len;
1313 slash = strchr(name, '/');
1314 if (slash)
1315 name = slash;
1316 }
1317
1318 if (data->files[i]->is_binary) {
1319 fprintf(options->file, "%s", line_prefix);
1320 show_name(options->file, prefix, name, len);
1321 fprintf(options->file, " Bin ");
1322 fprintf(options->file, "%s%"PRIuMAX"%s",
1323 del_c, deleted, reset);
1324 fprintf(options->file, " -> ");
1325 fprintf(options->file, "%s%"PRIuMAX"%s",
1326 add_c, added, reset);
1327 fprintf(options->file, " bytes");
1328 fprintf(options->file, "\n");
1329 continue;
1330 }
1331 else if (data->files[i]->is_unmerged) {
1332 fprintf(options->file, "%s", line_prefix);
1333 show_name(options->file, prefix, name, len);
1334 fprintf(options->file, " Unmerged\n");
1335 continue;
1336 }
1337 else if (!data->files[i]->is_renamed &&
1338 (added + deleted == 0)) {
1339 total_files--;
1340 continue;
1341 }
1342
1343 /*
1344 * scale the add/delete
1345 */
1346 add = added;
1347 del = deleted;
1348 adds += add;
1349 dels += del;
1350
1351 if (width <= max_change) {
1352 add = scale_linear(add, width, max_change);
1353 del = scale_linear(del, width, max_change);
1354 }
1355 fprintf(options->file, "%s", line_prefix);
1356 show_name(options->file, prefix, name, len);
1357 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1358 added + deleted ? " " : "");
1359 show_graph(options->file, '+', add, add_c, reset);
1360 show_graph(options->file, '-', del, del_c, reset);
1361 fprintf(options->file, "\n");
1362 }
1363 fprintf(options->file, "%s", line_prefix);
1364 fprintf(options->file,
1365 " %d files changed, %d insertions(+), %d deletions(-)\n",
1366 total_files, adds, dels);
1367 }
1368
1369 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1370 {
1371 int i, adds = 0, dels = 0, total_files = data->nr;
1372
1373 if (data->nr == 0)
1374 return;
1375
1376 for (i = 0; i < data->nr; i++) {
1377 if (!data->files[i]->is_binary &&
1378 !data->files[i]->is_unmerged) {
1379 int added = data->files[i]->added;
1380 int deleted= data->files[i]->deleted;
1381 if (!data->files[i]->is_renamed &&
1382 (added + deleted == 0)) {
1383 total_files--;
1384 } else {
1385 adds += added;
1386 dels += deleted;
1387 }
1388 }
1389 }
1390 if (options->output_prefix) {
1391 struct strbuf *msg = NULL;
1392 msg = options->output_prefix(options,
1393 options->output_prefix_data);
1394 fprintf(options->file, "%s", msg->buf);
1395 }
1396 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1397 total_files, adds, dels);
1398 }
1399
1400 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1401 {
1402 int i;
1403
1404 if (data->nr == 0)
1405 return;
1406
1407 for (i = 0; i < data->nr; i++) {
1408 struct diffstat_file *file = data->files[i];
1409
1410 if (options->output_prefix) {
1411 struct strbuf *msg = NULL;
1412 msg = options->output_prefix(options,
1413 options->output_prefix_data);
1414 fprintf(options->file, "%s", msg->buf);
1415 }
1416
1417 if (file->is_binary)
1418 fprintf(options->file, "-\t-\t");
1419 else
1420 fprintf(options->file,
1421 "%"PRIuMAX"\t%"PRIuMAX"\t",
1422 file->added, file->deleted);
1423 if (options->line_termination) {
1424 fill_print_name(file);
1425 if (!file->is_renamed)
1426 write_name_quoted(file->name, options->file,
1427 options->line_termination);
1428 else {
1429 fputs(file->print_name, options->file);
1430 putc(options->line_termination, options->file);
1431 }
1432 } else {
1433 if (file->is_renamed) {
1434 putc('\0', options->file);
1435 write_name_quoted(file->from_name, options->file, '\0');
1436 }
1437 write_name_quoted(file->name, options->file, '\0');
1438 }
1439 }
1440 }
1441
1442 struct dirstat_file {
1443 const char *name;
1444 unsigned long changed;
1445 };
1446
1447 struct dirstat_dir {
1448 struct dirstat_file *files;
1449 int alloc, nr, percent, cumulative;
1450 };
1451
1452 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1453 unsigned long changed, const char *base, int baselen)
1454 {
1455 unsigned long this_dir = 0;
1456 unsigned int sources = 0;
1457 const char *line_prefix = "";
1458 struct strbuf *msg = NULL;
1459
1460 if (opt->output_prefix) {
1461 msg = opt->output_prefix(opt, opt->output_prefix_data);
1462 line_prefix = msg->buf;
1463 }
1464
1465 while (dir->nr) {
1466 struct dirstat_file *f = dir->files;
1467 int namelen = strlen(f->name);
1468 unsigned long this;
1469 char *slash;
1470
1471 if (namelen < baselen)
1472 break;
1473 if (memcmp(f->name, base, baselen))
1474 break;
1475 slash = strchr(f->name + baselen, '/');
1476 if (slash) {
1477 int newbaselen = slash + 1 - f->name;
1478 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1479 sources++;
1480 } else {
1481 this = f->changed;
1482 dir->files++;
1483 dir->nr--;
1484 sources += 2;
1485 }
1486 this_dir += this;
1487 }
1488
1489 /*
1490 * We don't report dirstat's for
1491 * - the top level
1492 * - or cases where everything came from a single directory
1493 * under this directory (sources == 1).
1494 */
1495 if (baselen && sources != 1) {
1496 int permille = this_dir * 1000 / changed;
1497 if (permille) {
1498 int percent = permille / 10;
1499 if (percent >= dir->percent) {
1500 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1501 percent, permille % 10, baselen, base);
1502 if (!dir->cumulative)
1503 return 0;
1504 }
1505 }
1506 }
1507 return this_dir;
1508 }
1509
1510 static int dirstat_compare(const void *_a, const void *_b)
1511 {
1512 const struct dirstat_file *a = _a;
1513 const struct dirstat_file *b = _b;
1514 return strcmp(a->name, b->name);
1515 }
1516
1517 static void show_dirstat(struct diff_options *options)
1518 {
1519 int i;
1520 unsigned long changed;
1521 struct dirstat_dir dir;
1522 struct diff_queue_struct *q = &diff_queued_diff;
1523
1524 dir.files = NULL;
1525 dir.alloc = 0;
1526 dir.nr = 0;
1527 dir.percent = options->dirstat_percent;
1528 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1529
1530 changed = 0;
1531 for (i = 0; i < q->nr; i++) {
1532 struct diff_filepair *p = q->queue[i];
1533 const char *name;
1534 unsigned long copied, added, damage;
1535
1536 name = p->one->path ? p->one->path : p->two->path;
1537
1538 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1539 diff_populate_filespec(p->one, 0);
1540 diff_populate_filespec(p->two, 0);
1541 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1542 &copied, &added);
1543 diff_free_filespec_data(p->one);
1544 diff_free_filespec_data(p->two);
1545 } else if (DIFF_FILE_VALID(p->one)) {
1546 diff_populate_filespec(p->one, 1);
1547 copied = added = 0;
1548 diff_free_filespec_data(p->one);
1549 } else if (DIFF_FILE_VALID(p->two)) {
1550 diff_populate_filespec(p->two, 1);
1551 copied = 0;
1552 added = p->two->size;
1553 diff_free_filespec_data(p->two);
1554 } else
1555 continue;
1556
1557 /*
1558 * Original minus copied is the removed material,
1559 * added is the new material. They are both damages
1560 * made to the preimage. In --dirstat-by-file mode, count
1561 * damaged files, not damaged lines. This is done by
1562 * counting only a single damaged line per file.
1563 */
1564 damage = (p->one->size - copied) + added;
1565 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1566 damage = 1;
1567
1568 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1569 dir.files[dir.nr].name = name;
1570 dir.files[dir.nr].changed = damage;
1571 changed += damage;
1572 dir.nr++;
1573 }
1574
1575 /* This can happen even with many files, if everything was renames */
1576 if (!changed)
1577 return;
1578
1579 /* Show all directories with more than x% of the changes */
1580 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1581 gather_dirstat(options, &dir, changed, "", 0);
1582 }
1583
1584 static void free_diffstat_info(struct diffstat_t *diffstat)
1585 {
1586 int i;
1587 for (i = 0; i < diffstat->nr; i++) {
1588 struct diffstat_file *f = diffstat->files[i];
1589 if (f->name != f->print_name)
1590 free(f->print_name);
1591 free(f->name);
1592 free(f->from_name);
1593 free(f);
1594 }
1595 free(diffstat->files);
1596 }
1597
1598 struct checkdiff_t {
1599 const char *filename;
1600 int lineno;
1601 int conflict_marker_size;
1602 struct diff_options *o;
1603 unsigned ws_rule;
1604 unsigned status;
1605 };
1606
1607 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1608 {
1609 char firstchar;
1610 int cnt;
1611
1612 if (len < marker_size + 1)
1613 return 0;
1614 firstchar = line[0];
1615 switch (firstchar) {
1616 case '=': case '>': case '<': case '|':
1617 break;
1618 default:
1619 return 0;
1620 }
1621 for (cnt = 1; cnt < marker_size; cnt++)
1622 if (line[cnt] != firstchar)
1623 return 0;
1624 /* line[1] thru line[marker_size-1] are same as firstchar */
1625 if (len < marker_size + 1 || !isspace(line[marker_size]))
1626 return 0;
1627 return 1;
1628 }
1629
1630 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1631 {
1632 struct checkdiff_t *data = priv;
1633 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1634 int marker_size = data->conflict_marker_size;
1635 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1636 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1637 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1638 char *err;
1639 char *line_prefix = "";
1640 struct strbuf *msgbuf;
1641
1642 assert(data->o);
1643 if (data->o->output_prefix) {
1644 msgbuf = data->o->output_prefix(data->o,
1645 data->o->output_prefix_data);
1646 line_prefix = msgbuf->buf;
1647 }
1648
1649 if (line[0] == '+') {
1650 unsigned bad;
1651 data->lineno++;
1652 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1653 data->status |= 1;
1654 fprintf(data->o->file,
1655 "%s%s:%d: leftover conflict marker\n",
1656 line_prefix, data->filename, data->lineno);
1657 }
1658 bad = ws_check(line + 1, len - 1, data->ws_rule);
1659 if (!bad)
1660 return;
1661 data->status |= bad;
1662 err = whitespace_error_string(bad);
1663 fprintf(data->o->file, "%s%s:%d: %s.\n",
1664 line_prefix, data->filename, data->lineno, err);
1665 free(err);
1666 emit_line(data->o, set, reset, line, 1);
1667 ws_check_emit(line + 1, len - 1, data->ws_rule,
1668 data->o->file, set, reset, ws);
1669 } else if (line[0] == ' ') {
1670 data->lineno++;
1671 } else if (line[0] == '@') {
1672 char *plus = strchr(line, '+');
1673 if (plus)
1674 data->lineno = strtol(plus, NULL, 10) - 1;
1675 else
1676 die("invalid diff");
1677 }
1678 }
1679
1680 static unsigned char *deflate_it(char *data,
1681 unsigned long size,
1682 unsigned long *result_size)
1683 {
1684 int bound;
1685 unsigned char *deflated;
1686 z_stream stream;
1687
1688 memset(&stream, 0, sizeof(stream));
1689 deflateInit(&stream, zlib_compression_level);
1690 bound = deflateBound(&stream, size);
1691 deflated = xmalloc(bound);
1692 stream.next_out = deflated;
1693 stream.avail_out = bound;
1694
1695 stream.next_in = (unsigned char *)data;
1696 stream.avail_in = size;
1697 while (deflate(&stream, Z_FINISH) == Z_OK)
1698 ; /* nothing */
1699 deflateEnd(&stream);
1700 *result_size = stream.total_out;
1701 return deflated;
1702 }
1703
1704 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1705 {
1706 void *cp;
1707 void *delta;
1708 void *deflated;
1709 void *data;
1710 unsigned long orig_size;
1711 unsigned long delta_size;
1712 unsigned long deflate_size;
1713 unsigned long data_size;
1714
1715 /* We could do deflated delta, or we could do just deflated two,
1716 * whichever is smaller.
1717 */
1718 delta = NULL;
1719 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1720 if (one->size && two->size) {
1721 delta = diff_delta(one->ptr, one->size,
1722 two->ptr, two->size,
1723 &delta_size, deflate_size);
1724 if (delta) {
1725 void *to_free = delta;
1726 orig_size = delta_size;
1727 delta = deflate_it(delta, delta_size, &delta_size);
1728 free(to_free);
1729 }
1730 }
1731
1732 if (delta && delta_size < deflate_size) {
1733 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1734 free(deflated);
1735 data = delta;
1736 data_size = delta_size;
1737 }
1738 else {
1739 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1740 free(delta);
1741 data = deflated;
1742 data_size = deflate_size;
1743 }
1744
1745 /* emit data encoded in base85 */
1746 cp = data;
1747 while (data_size) {
1748 int bytes = (52 < data_size) ? 52 : data_size;
1749 char line[70];
1750 data_size -= bytes;
1751 if (bytes <= 26)
1752 line[0] = bytes + 'A' - 1;
1753 else
1754 line[0] = bytes - 26 + 'a' - 1;
1755 encode_85(line + 1, cp, bytes);
1756 cp = (char *) cp + bytes;
1757 fprintf(file, "%s", prefix);
1758 fputs(line, file);
1759 fputc('\n', file);
1760 }
1761 fprintf(file, "%s\n", prefix);
1762 free(data);
1763 }
1764
1765 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1766 {
1767 fprintf(file, "%sGIT binary patch\n", prefix);
1768 emit_binary_diff_body(file, one, two, prefix);
1769 emit_binary_diff_body(file, two, one, prefix);
1770 }
1771
1772 static void diff_filespec_load_driver(struct diff_filespec *one)
1773 {
1774 /* Use already-loaded driver */
1775 if (one->driver)
1776 return;
1777
1778 if (S_ISREG(one->mode))
1779 one->driver = userdiff_find_by_path(one->path);
1780
1781 /* Fallback to default settings */
1782 if (!one->driver)
1783 one->driver = userdiff_find_by_name("default");
1784 }
1785
1786 int diff_filespec_is_binary(struct diff_filespec *one)
1787 {
1788 if (one->is_binary == -1) {
1789 diff_filespec_load_driver(one);
1790 if (one->driver->binary != -1)
1791 one->is_binary = one->driver->binary;
1792 else {
1793 if (!one->data && DIFF_FILE_VALID(one))
1794 diff_populate_filespec(one, 0);
1795 if (one->data)
1796 one->is_binary = buffer_is_binary(one->data,
1797 one->size);
1798 if (one->is_binary == -1)
1799 one->is_binary = 0;
1800 }
1801 }
1802 return one->is_binary;
1803 }
1804
1805 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1806 {
1807 diff_filespec_load_driver(one);
1808 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1809 }
1810
1811 static const char *userdiff_word_regex(struct diff_filespec *one)
1812 {
1813 diff_filespec_load_driver(one);
1814 return one->driver->word_regex;
1815 }
1816
1817 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1818 {
1819 if (!options->a_prefix)
1820 options->a_prefix = a;
1821 if (!options->b_prefix)
1822 options->b_prefix = b;
1823 }
1824
1825 struct userdiff_driver *get_textconv(struct diff_filespec *one)
1826 {
1827 if (!DIFF_FILE_VALID(one))
1828 return NULL;
1829
1830 diff_filespec_load_driver(one);
1831 if (!one->driver->textconv)
1832 return NULL;
1833
1834 if (one->driver->textconv_want_cache && !one->driver->textconv_cache) {
1835 struct notes_cache *c = xmalloc(sizeof(*c));
1836 struct strbuf name = STRBUF_INIT;
1837
1838 strbuf_addf(&name, "textconv/%s", one->driver->name);
1839 notes_cache_init(c, name.buf, one->driver->textconv);
1840 one->driver->textconv_cache = c;
1841 }
1842
1843 return one->driver;
1844 }
1845
1846 static void builtin_diff(const char *name_a,
1847 const char *name_b,
1848 struct diff_filespec *one,
1849 struct diff_filespec *two,
1850 const char *xfrm_msg,
1851 int must_show_header,
1852 struct diff_options *o,
1853 int complete_rewrite)
1854 {
1855 mmfile_t mf1, mf2;
1856 const char *lbl[2];
1857 char *a_one, *b_two;
1858 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1859 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1860 const char *a_prefix, *b_prefix;
1861 struct userdiff_driver *textconv_one = NULL;
1862 struct userdiff_driver *textconv_two = NULL;
1863 struct strbuf header = STRBUF_INIT;
1864 struct strbuf *msgbuf;
1865 char *line_prefix = "";
1866
1867 if (o->output_prefix) {
1868 msgbuf = o->output_prefix(o, o->output_prefix_data);
1869 line_prefix = msgbuf->buf;
1870 }
1871
1872 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
1873 (!one->mode || S_ISGITLINK(one->mode)) &&
1874 (!two->mode || S_ISGITLINK(two->mode))) {
1875 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
1876 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
1877 show_submodule_summary(o->file, one ? one->path : two->path,
1878 one->sha1, two->sha1, two->dirty_submodule,
1879 del, add, reset);
1880 return;
1881 }
1882
1883 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1884 textconv_one = get_textconv(one);
1885 textconv_two = get_textconv(two);
1886 }
1887
1888 diff_set_mnemonic_prefix(o, "a/", "b/");
1889 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1890 a_prefix = o->b_prefix;
1891 b_prefix = o->a_prefix;
1892 } else {
1893 a_prefix = o->a_prefix;
1894 b_prefix = o->b_prefix;
1895 }
1896
1897 /* Never use a non-valid filename anywhere if at all possible */
1898 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1899 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1900
1901 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1902 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1903 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1904 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1905 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
1906 if (lbl[0][0] == '/') {
1907 /* /dev/null */
1908 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
1909 if (xfrm_msg)
1910 strbuf_addstr(&header, xfrm_msg);
1911 must_show_header = 1;
1912 }
1913 else if (lbl[1][0] == '/') {
1914 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
1915 if (xfrm_msg)
1916 strbuf_addstr(&header, xfrm_msg);
1917 must_show_header = 1;
1918 }
1919 else {
1920 if (one->mode != two->mode) {
1921 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
1922 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
1923 must_show_header = 1;
1924 }
1925 if (xfrm_msg)
1926 strbuf_addstr(&header, xfrm_msg);
1927
1928 /*
1929 * we do not run diff between different kind
1930 * of objects.
1931 */
1932 if ((one->mode ^ two->mode) & S_IFMT)
1933 goto free_ab_and_return;
1934 if (complete_rewrite &&
1935 (textconv_one || !diff_filespec_is_binary(one)) &&
1936 (textconv_two || !diff_filespec_is_binary(two))) {
1937 fprintf(o->file, "%s", header.buf);
1938 strbuf_reset(&header);
1939 emit_rewrite_diff(name_a, name_b, one, two,
1940 textconv_one, textconv_two, o);
1941 o->found_changes = 1;
1942 goto free_ab_and_return;
1943 }
1944 }
1945
1946 if (!DIFF_OPT_TST(o, TEXT) &&
1947 ( (!textconv_one && diff_filespec_is_binary(one)) ||
1948 (!textconv_two && diff_filespec_is_binary(two)) )) {
1949 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1950 die("unable to read files to diff");
1951 /* Quite common confusing case */
1952 if (mf1.size == mf2.size &&
1953 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
1954 if (must_show_header)
1955 fprintf(o->file, "%s", header.buf);
1956 goto free_ab_and_return;
1957 }
1958 fprintf(o->file, "%s", header.buf);
1959 strbuf_reset(&header);
1960 if (DIFF_OPT_TST(o, BINARY))
1961 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
1962 else
1963 fprintf(o->file, "%sBinary files %s and %s differ\n",
1964 line_prefix, lbl[0], lbl[1]);
1965 o->found_changes = 1;
1966 }
1967 else {
1968 /* Crazy xdl interfaces.. */
1969 const char *diffopts = getenv("GIT_DIFF_OPTS");
1970 xpparam_t xpp;
1971 xdemitconf_t xecfg;
1972 struct emit_callback ecbdata;
1973 const struct userdiff_funcname *pe;
1974
1975 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
1976 fprintf(o->file, "%s", header.buf);
1977 strbuf_reset(&header);
1978 }
1979
1980 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
1981 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
1982
1983 pe = diff_funcname_pattern(one);
1984 if (!pe)
1985 pe = diff_funcname_pattern(two);
1986
1987 memset(&xpp, 0, sizeof(xpp));
1988 memset(&xecfg, 0, sizeof(xecfg));
1989 memset(&ecbdata, 0, sizeof(ecbdata));
1990 ecbdata.label_path = lbl;
1991 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1992 ecbdata.found_changesp = &o->found_changes;
1993 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1994 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
1995 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1996 ecbdata.opt = o;
1997 ecbdata.header = header.len ? &header : NULL;
1998 xpp.flags = o->xdl_opts;
1999 xecfg.ctxlen = o->context;
2000 xecfg.interhunkctxlen = o->interhunkcontext;
2001 xecfg.flags = XDL_EMIT_FUNCNAMES;
2002 if (pe)
2003 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2004 if (!diffopts)
2005 ;
2006 else if (!prefixcmp(diffopts, "--unified="))
2007 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2008 else if (!prefixcmp(diffopts, "-u"))
2009 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2010 if (o->word_diff) {
2011 int i;
2012
2013 ecbdata.diff_words =
2014 xcalloc(1, sizeof(struct diff_words_data));
2015 ecbdata.diff_words->type = o->word_diff;
2016 ecbdata.diff_words->opt = o;
2017 if (!o->word_regex)
2018 o->word_regex = userdiff_word_regex(one);
2019 if (!o->word_regex)
2020 o->word_regex = userdiff_word_regex(two);
2021 if (!o->word_regex)
2022 o->word_regex = diff_word_regex_cfg;
2023 if (o->word_regex) {
2024 ecbdata.diff_words->word_regex = (regex_t *)
2025 xmalloc(sizeof(regex_t));
2026 if (regcomp(ecbdata.diff_words->word_regex,
2027 o->word_regex,
2028 REG_EXTENDED | REG_NEWLINE))
2029 die ("Invalid regular expression: %s",
2030 o->word_regex);
2031 }
2032 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2033 if (o->word_diff == diff_words_styles[i].type) {
2034 ecbdata.diff_words->style =
2035 &diff_words_styles[i];
2036 break;
2037 }
2038 }
2039 if (DIFF_OPT_TST(o, COLOR_DIFF)) {
2040 struct diff_words_style *st = ecbdata.diff_words->style;
2041 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2042 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2043 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2044 }
2045 }
2046 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2047 &xpp, &xecfg);
2048 if (o->word_diff)
2049 free_diff_words_data(&ecbdata);
2050 if (textconv_one)
2051 free(mf1.ptr);
2052 if (textconv_two)
2053 free(mf2.ptr);
2054 xdiff_clear_find_func(&xecfg);
2055 }
2056
2057 free_ab_and_return:
2058 strbuf_release(&header);
2059 diff_free_filespec_data(one);
2060 diff_free_filespec_data(two);
2061 free(a_one);
2062 free(b_two);
2063 return;
2064 }
2065
2066 static void builtin_diffstat(const char *name_a, const char *name_b,
2067 struct diff_filespec *one,
2068 struct diff_filespec *two,
2069 struct diffstat_t *diffstat,
2070 struct diff_options *o,
2071 int complete_rewrite)
2072 {
2073 mmfile_t mf1, mf2;
2074 struct diffstat_file *data;
2075
2076 data = diffstat_add(diffstat, name_a, name_b);
2077
2078 if (!one || !two) {
2079 data->is_unmerged = 1;
2080 return;
2081 }
2082 if (complete_rewrite) {
2083 diff_populate_filespec(one, 0);
2084 diff_populate_filespec(two, 0);
2085 data->deleted = count_lines(one->data, one->size);
2086 data->added = count_lines(two->data, two->size);
2087 goto free_and_return;
2088 }
2089 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2090 die("unable to read files to diff");
2091
2092 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2093 data->is_binary = 1;
2094 data->added = mf2.size;
2095 data->deleted = mf1.size;
2096 } else {
2097 /* Crazy xdl interfaces.. */
2098 xpparam_t xpp;
2099 xdemitconf_t xecfg;
2100
2101 memset(&xpp, 0, sizeof(xpp));
2102 memset(&xecfg, 0, sizeof(xecfg));
2103 xpp.flags = o->xdl_opts;
2104 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2105 &xpp, &xecfg);
2106 }
2107
2108 free_and_return:
2109 diff_free_filespec_data(one);
2110 diff_free_filespec_data(two);
2111 }
2112
2113 static void builtin_checkdiff(const char *name_a, const char *name_b,
2114 const char *attr_path,
2115 struct diff_filespec *one,
2116 struct diff_filespec *two,
2117 struct diff_options *o)
2118 {
2119 mmfile_t mf1, mf2;
2120 struct checkdiff_t data;
2121
2122 if (!two)
2123 return;
2124
2125 memset(&data, 0, sizeof(data));
2126 data.filename = name_b ? name_b : name_a;
2127 data.lineno = 0;
2128 data.o = o;
2129 data.ws_rule = whitespace_rule(attr_path);
2130 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2131
2132 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2133 die("unable to read files to diff");
2134
2135 /*
2136 * All the other codepaths check both sides, but not checking
2137 * the "old" side here is deliberate. We are checking the newly
2138 * introduced changes, and as long as the "new" side is text, we
2139 * can and should check what it introduces.
2140 */
2141 if (diff_filespec_is_binary(two))
2142 goto free_and_return;
2143 else {
2144 /* Crazy xdl interfaces.. */
2145 xpparam_t xpp;
2146 xdemitconf_t xecfg;
2147
2148 memset(&xpp, 0, sizeof(xpp));
2149 memset(&xecfg, 0, sizeof(xecfg));
2150 xecfg.ctxlen = 1; /* at least one context line */
2151 xpp.flags = 0;
2152 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2153 &xpp, &xecfg);
2154
2155 if (data.ws_rule & WS_BLANK_AT_EOF) {
2156 struct emit_callback ecbdata;
2157 int blank_at_eof;
2158
2159 ecbdata.ws_rule = data.ws_rule;
2160 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2161 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2162
2163 if (blank_at_eof) {
2164 static char *err;
2165 if (!err)
2166 err = whitespace_error_string(WS_BLANK_AT_EOF);
2167 fprintf(o->file, "%s:%d: %s.\n",
2168 data.filename, blank_at_eof, err);
2169 data.status = 1; /* report errors */
2170 }
2171 }
2172 }
2173 free_and_return:
2174 diff_free_filespec_data(one);
2175 diff_free_filespec_data(two);
2176 if (data.status)
2177 DIFF_OPT_SET(o, CHECK_FAILED);
2178 }
2179
2180 struct diff_filespec *alloc_filespec(const char *path)
2181 {
2182 int namelen = strlen(path);
2183 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2184
2185 memset(spec, 0, sizeof(*spec));
2186 spec->path = (char *)(spec + 1);
2187 memcpy(spec->path, path, namelen+1);
2188 spec->count = 1;
2189 spec->is_binary = -1;
2190 return spec;
2191 }
2192
2193 void free_filespec(struct diff_filespec *spec)
2194 {
2195 if (!--spec->count) {
2196 diff_free_filespec_data(spec);
2197 free(spec);
2198 }
2199 }
2200
2201 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2202 unsigned short mode)
2203 {
2204 if (mode) {
2205 spec->mode = canon_mode(mode);
2206 hashcpy(spec->sha1, sha1);
2207 spec->sha1_valid = !is_null_sha1(sha1);
2208 }
2209 }
2210
2211 /*
2212 * Given a name and sha1 pair, if the index tells us the file in
2213 * the work tree has that object contents, return true, so that
2214 * prepare_temp_file() does not have to inflate and extract.
2215 */
2216 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2217 {
2218 struct cache_entry *ce;
2219 struct stat st;
2220 int pos, len;
2221
2222 /*
2223 * We do not read the cache ourselves here, because the
2224 * benchmark with my previous version that always reads cache
2225 * shows that it makes things worse for diff-tree comparing
2226 * two linux-2.6 kernel trees in an already checked out work
2227 * tree. This is because most diff-tree comparisons deal with
2228 * only a small number of files, while reading the cache is
2229 * expensive for a large project, and its cost outweighs the
2230 * savings we get by not inflating the object to a temporary
2231 * file. Practically, this code only helps when we are used
2232 * by diff-cache --cached, which does read the cache before
2233 * calling us.
2234 */
2235 if (!active_cache)
2236 return 0;
2237
2238 /* We want to avoid the working directory if our caller
2239 * doesn't need the data in a normal file, this system
2240 * is rather slow with its stat/open/mmap/close syscalls,
2241 * and the object is contained in a pack file. The pack
2242 * is probably already open and will be faster to obtain
2243 * the data through than the working directory. Loose
2244 * objects however would tend to be slower as they need
2245 * to be individually opened and inflated.
2246 */
2247 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2248 return 0;
2249
2250 len = strlen(name);
2251 pos = cache_name_pos(name, len);
2252 if (pos < 0)
2253 return 0;
2254 ce = active_cache[pos];
2255
2256 /*
2257 * This is not the sha1 we are looking for, or
2258 * unreusable because it is not a regular file.
2259 */
2260 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2261 return 0;
2262
2263 /*
2264 * If ce is marked as "assume unchanged", there is no
2265 * guarantee that work tree matches what we are looking for.
2266 */
2267 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2268 return 0;
2269
2270 /*
2271 * If ce matches the file in the work tree, we can reuse it.
2272 */
2273 if (ce_uptodate(ce) ||
2274 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2275 return 1;
2276
2277 return 0;
2278 }
2279
2280 static int populate_from_stdin(struct diff_filespec *s)
2281 {
2282 struct strbuf buf = STRBUF_INIT;
2283 size_t size = 0;
2284
2285 if (strbuf_read(&buf, 0, 0) < 0)
2286 return error("error while reading from stdin %s",
2287 strerror(errno));
2288
2289 s->should_munmap = 0;
2290 s->data = strbuf_detach(&buf, &size);
2291 s->size = size;
2292 s->should_free = 1;
2293 return 0;
2294 }
2295
2296 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2297 {
2298 int len;
2299 char *data = xmalloc(100), *dirty = "";
2300
2301 /* Are we looking at the work tree? */
2302 if (s->dirty_submodule)
2303 dirty = "-dirty";
2304
2305 len = snprintf(data, 100,
2306 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2307 s->data = data;
2308 s->size = len;
2309 s->should_free = 1;
2310 if (size_only) {
2311 s->data = NULL;
2312 free(data);
2313 }
2314 return 0;
2315 }
2316
2317 /*
2318 * While doing rename detection and pickaxe operation, we may need to
2319 * grab the data for the blob (or file) for our own in-core comparison.
2320 * diff_filespec has data and size fields for this purpose.
2321 */
2322 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2323 {
2324 int err = 0;
2325 if (!DIFF_FILE_VALID(s))
2326 die("internal error: asking to populate invalid file.");
2327 if (S_ISDIR(s->mode))
2328 return -1;
2329
2330 if (s->data)
2331 return 0;
2332
2333 if (size_only && 0 < s->size)
2334 return 0;
2335
2336 if (S_ISGITLINK(s->mode))
2337 return diff_populate_gitlink(s, size_only);
2338
2339 if (!s->sha1_valid ||
2340 reuse_worktree_file(s->path, s->sha1, 0)) {
2341 struct strbuf buf = STRBUF_INIT;
2342 struct stat st;
2343 int fd;
2344
2345 if (!strcmp(s->path, "-"))
2346 return populate_from_stdin(s);
2347
2348 if (lstat(s->path, &st) < 0) {
2349 if (errno == ENOENT) {
2350 err_empty:
2351 err = -1;
2352 empty:
2353 s->data = (char *)"";
2354 s->size = 0;
2355 return err;
2356 }
2357 }
2358 s->size = xsize_t(st.st_size);
2359 if (!s->size)
2360 goto empty;
2361 if (S_ISLNK(st.st_mode)) {
2362 struct strbuf sb = STRBUF_INIT;
2363
2364 if (strbuf_readlink(&sb, s->path, s->size))
2365 goto err_empty;
2366 s->size = sb.len;
2367 s->data = strbuf_detach(&sb, NULL);
2368 s->should_free = 1;
2369 return 0;
2370 }
2371 if (size_only)
2372 return 0;
2373 fd = open(s->path, O_RDONLY);
2374 if (fd < 0)
2375 goto err_empty;
2376 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2377 close(fd);
2378 s->should_munmap = 1;
2379
2380 /*
2381 * Convert from working tree format to canonical git format
2382 */
2383 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2384 size_t size = 0;
2385 munmap(s->data, s->size);
2386 s->should_munmap = 0;
2387 s->data = strbuf_detach(&buf, &size);
2388 s->size = size;
2389 s->should_free = 1;
2390 }
2391 }
2392 else {
2393 enum object_type type;
2394 if (size_only) {
2395 type = sha1_object_info(s->sha1, &s->size);
2396 if (type < 0)
2397 die("unable to read %s", sha1_to_hex(s->sha1));
2398 } else {
2399 s->data = read_sha1_file(s->sha1, &type, &s->size);
2400 if (!s->data)
2401 die("unable to read %s", sha1_to_hex(s->sha1));
2402 s->should_free = 1;
2403 }
2404 }
2405 return 0;
2406 }
2407
2408 void diff_free_filespec_blob(struct diff_filespec *s)
2409 {
2410 if (s->should_free)
2411 free(s->data);
2412 else if (s->should_munmap)
2413 munmap(s->data, s->size);
2414
2415 if (s->should_free || s->should_munmap) {
2416 s->should_free = s->should_munmap = 0;
2417 s->data = NULL;
2418 }
2419 }
2420
2421 void diff_free_filespec_data(struct diff_filespec *s)
2422 {
2423 diff_free_filespec_blob(s);
2424 free(s->cnt_data);
2425 s->cnt_data = NULL;
2426 }
2427
2428 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2429 void *blob,
2430 unsigned long size,
2431 const unsigned char *sha1,
2432 int mode)
2433 {
2434 int fd;
2435 struct strbuf buf = STRBUF_INIT;
2436 struct strbuf template = STRBUF_INIT;
2437 char *path_dup = xstrdup(path);
2438 const char *base = basename(path_dup);
2439
2440 /* Generate "XXXXXX_basename.ext" */
2441 strbuf_addstr(&template, "XXXXXX_");
2442 strbuf_addstr(&template, base);
2443
2444 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2445 strlen(base) + 1);
2446 if (fd < 0)
2447 die_errno("unable to create temp-file");
2448 if (convert_to_working_tree(path,
2449 (const char *)blob, (size_t)size, &buf)) {
2450 blob = buf.buf;
2451 size = buf.len;
2452 }
2453 if (write_in_full(fd, blob, size) != size)
2454 die_errno("unable to write temp-file");
2455 close(fd);
2456 temp->name = temp->tmp_path;
2457 strcpy(temp->hex, sha1_to_hex(sha1));
2458 temp->hex[40] = 0;
2459 sprintf(temp->mode, "%06o", mode);
2460 strbuf_release(&buf);
2461 strbuf_release(&template);
2462 free(path_dup);
2463 }
2464
2465 static struct diff_tempfile *prepare_temp_file(const char *name,
2466 struct diff_filespec *one)
2467 {
2468 struct diff_tempfile *temp = claim_diff_tempfile();
2469
2470 if (!DIFF_FILE_VALID(one)) {
2471 not_a_valid_file:
2472 /* A '-' entry produces this for file-2, and
2473 * a '+' entry produces this for file-1.
2474 */
2475 temp->name = "/dev/null";
2476 strcpy(temp->hex, ".");
2477 strcpy(temp->mode, ".");
2478 return temp;
2479 }
2480
2481 if (!remove_tempfile_installed) {
2482 atexit(remove_tempfile);
2483 sigchain_push_common(remove_tempfile_on_signal);
2484 remove_tempfile_installed = 1;
2485 }
2486
2487 if (!one->sha1_valid ||
2488 reuse_worktree_file(name, one->sha1, 1)) {
2489 struct stat st;
2490 if (lstat(name, &st) < 0) {
2491 if (errno == ENOENT)
2492 goto not_a_valid_file;
2493 die_errno("stat(%s)", name);
2494 }
2495 if (S_ISLNK(st.st_mode)) {
2496 struct strbuf sb = STRBUF_INIT;
2497 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2498 die_errno("readlink(%s)", name);
2499 prep_temp_blob(name, temp, sb.buf, sb.len,
2500 (one->sha1_valid ?
2501 one->sha1 : null_sha1),
2502 (one->sha1_valid ?
2503 one->mode : S_IFLNK));
2504 strbuf_release(&sb);
2505 }
2506 else {
2507 /* we can borrow from the file in the work tree */
2508 temp->name = name;
2509 if (!one->sha1_valid)
2510 strcpy(temp->hex, sha1_to_hex(null_sha1));
2511 else
2512 strcpy(temp->hex, sha1_to_hex(one->sha1));
2513 /* Even though we may sometimes borrow the
2514 * contents from the work tree, we always want
2515 * one->mode. mode is trustworthy even when
2516 * !(one->sha1_valid), as long as
2517 * DIFF_FILE_VALID(one).
2518 */
2519 sprintf(temp->mode, "%06o", one->mode);
2520 }
2521 return temp;
2522 }
2523 else {
2524 if (diff_populate_filespec(one, 0))
2525 die("cannot read data blob for %s", one->path);
2526 prep_temp_blob(name, temp, one->data, one->size,
2527 one->sha1, one->mode);
2528 }
2529 return temp;
2530 }
2531
2532 /* An external diff command takes:
2533 *
2534 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2535 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2536 *
2537 */
2538 static void run_external_diff(const char *pgm,
2539 const char *name,
2540 const char *other,
2541 struct diff_filespec *one,
2542 struct diff_filespec *two,
2543 const char *xfrm_msg,
2544 int complete_rewrite)
2545 {
2546 const char *spawn_arg[10];
2547 int retval;
2548 const char **arg = &spawn_arg[0];
2549
2550 if (one && two) {
2551 struct diff_tempfile *temp_one, *temp_two;
2552 const char *othername = (other ? other : name);
2553 temp_one = prepare_temp_file(name, one);
2554 temp_two = prepare_temp_file(othername, two);
2555 *arg++ = pgm;
2556 *arg++ = name;
2557 *arg++ = temp_one->name;
2558 *arg++ = temp_one->hex;
2559 *arg++ = temp_one->mode;
2560 *arg++ = temp_two->name;
2561 *arg++ = temp_two->hex;
2562 *arg++ = temp_two->mode;
2563 if (other) {
2564 *arg++ = other;
2565 *arg++ = xfrm_msg;
2566 }
2567 } else {
2568 *arg++ = pgm;
2569 *arg++ = name;
2570 }
2571 *arg = NULL;
2572 fflush(NULL);
2573 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2574 remove_tempfile();
2575 if (retval) {
2576 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2577 exit(1);
2578 }
2579 }
2580
2581 static int similarity_index(struct diff_filepair *p)
2582 {
2583 return p->score * 100 / MAX_SCORE;
2584 }
2585
2586 static void fill_metainfo(struct strbuf *msg,
2587 const char *name,
2588 const char *other,
2589 struct diff_filespec *one,
2590 struct diff_filespec *two,
2591 struct diff_options *o,
2592 struct diff_filepair *p,
2593 int *must_show_header,
2594 int use_color)
2595 {
2596 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2597 const char *reset = diff_get_color(use_color, DIFF_RESET);
2598 struct strbuf *msgbuf;
2599 char *line_prefix = "";
2600
2601 *must_show_header = 1;
2602 if (o->output_prefix) {
2603 msgbuf = o->output_prefix(o, o->output_prefix_data);
2604 line_prefix = msgbuf->buf;
2605 }
2606 strbuf_init(msg, PATH_MAX * 2 + 300);
2607 switch (p->status) {
2608 case DIFF_STATUS_COPIED:
2609 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2610 line_prefix, set, similarity_index(p));
2611 strbuf_addf(msg, "%s\n%s%scopy from ",
2612 reset, line_prefix, set);
2613 quote_c_style(name, msg, NULL, 0);
2614 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2615 quote_c_style(other, msg, NULL, 0);
2616 strbuf_addf(msg, "%s\n", reset);
2617 break;
2618 case DIFF_STATUS_RENAMED:
2619 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2620 line_prefix, set, similarity_index(p));
2621 strbuf_addf(msg, "%s\n%s%srename from ",
2622 reset, line_prefix, set);
2623 quote_c_style(name, msg, NULL, 0);
2624 strbuf_addf(msg, "%s\n%s%srename to ",
2625 reset, line_prefix, set);
2626 quote_c_style(other, msg, NULL, 0);
2627 strbuf_addf(msg, "%s\n", reset);
2628 break;
2629 case DIFF_STATUS_MODIFIED:
2630 if (p->score) {
2631 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2632 line_prefix,
2633 set, similarity_index(p), reset);
2634 break;
2635 }
2636 /* fallthru */
2637 default:
2638 *must_show_header = 0;
2639 }
2640 if (one && two && hashcmp(one->sha1, two->sha1)) {
2641 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2642
2643 if (DIFF_OPT_TST(o, BINARY)) {
2644 mmfile_t mf;
2645 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2646 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2647 abbrev = 40;
2648 }
2649 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2650 find_unique_abbrev(one->sha1, abbrev));
2651 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2652 if (one->mode == two->mode)
2653 strbuf_addf(msg, " %06o", one->mode);
2654 strbuf_addf(msg, "%s\n", reset);
2655 }
2656 }
2657
2658 static void run_diff_cmd(const char *pgm,
2659 const char *name,
2660 const char *other,
2661 const char *attr_path,
2662 struct diff_filespec *one,
2663 struct diff_filespec *two,
2664 struct strbuf *msg,
2665 struct diff_options *o,
2666 struct diff_filepair *p)
2667 {
2668 const char *xfrm_msg = NULL;
2669 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2670 int must_show_header = 0;
2671
2672 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2673 pgm = NULL;
2674 else {
2675 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2676 if (drv && drv->external)
2677 pgm = drv->external;
2678 }
2679
2680 if (msg) {
2681 /*
2682 * don't use colors when the header is intended for an
2683 * external diff driver
2684 */
2685 fill_metainfo(msg, name, other, one, two, o, p,
2686 &must_show_header,
2687 DIFF_OPT_TST(o, COLOR_DIFF) && !pgm);
2688 xfrm_msg = msg->len ? msg->buf : NULL;
2689 }
2690
2691 if (pgm) {
2692 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2693 complete_rewrite);
2694 return;
2695 }
2696 if (one && two)
2697 builtin_diff(name, other ? other : name,
2698 one, two, xfrm_msg, must_show_header,
2699 o, complete_rewrite);
2700 else
2701 fprintf(o->file, "* Unmerged path %s\n", name);
2702 }
2703
2704 static void diff_fill_sha1_info(struct diff_filespec *one)
2705 {
2706 if (DIFF_FILE_VALID(one)) {
2707 if (!one->sha1_valid) {
2708 struct stat st;
2709 if (!strcmp(one->path, "-")) {
2710 hashcpy(one->sha1, null_sha1);
2711 return;
2712 }
2713 if (lstat(one->path, &st) < 0)
2714 die_errno("stat '%s'", one->path);
2715 if (index_path(one->sha1, one->path, &st, 0))
2716 die("cannot hash %s", one->path);
2717 }
2718 }
2719 else
2720 hashclr(one->sha1);
2721 }
2722
2723 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2724 {
2725 /* Strip the prefix but do not molest /dev/null and absolute paths */
2726 if (*namep && **namep != '/') {
2727 *namep += prefix_length;
2728 if (**namep == '/')
2729 ++*namep;
2730 }
2731 if (*otherp && **otherp != '/') {
2732 *otherp += prefix_length;
2733 if (**otherp == '/')
2734 ++*otherp;
2735 }
2736 }
2737
2738 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2739 {
2740 const char *pgm = external_diff();
2741 struct strbuf msg;
2742 struct diff_filespec *one = p->one;
2743 struct diff_filespec *two = p->two;
2744 const char *name;
2745 const char *other;
2746 const char *attr_path;
2747
2748 name = p->one->path;
2749 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2750 attr_path = name;
2751 if (o->prefix_length)
2752 strip_prefix(o->prefix_length, &name, &other);
2753
2754 if (DIFF_PAIR_UNMERGED(p)) {
2755 run_diff_cmd(pgm, name, NULL, attr_path,
2756 NULL, NULL, NULL, o, p);
2757 return;
2758 }
2759
2760 diff_fill_sha1_info(one);
2761 diff_fill_sha1_info(two);
2762
2763 if (!pgm &&
2764 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2765 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2766 /*
2767 * a filepair that changes between file and symlink
2768 * needs to be split into deletion and creation.
2769 */
2770 struct diff_filespec *null = alloc_filespec(two->path);
2771 run_diff_cmd(NULL, name, other, attr_path,
2772 one, null, &msg, o, p);
2773 free(null);
2774 strbuf_release(&msg);
2775
2776 null = alloc_filespec(one->path);
2777 run_diff_cmd(NULL, name, other, attr_path,
2778 null, two, &msg, o, p);
2779 free(null);
2780 }
2781 else
2782 run_diff_cmd(pgm, name, other, attr_path,
2783 one, two, &msg, o, p);
2784
2785 strbuf_release(&msg);
2786 }
2787
2788 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2789 struct diffstat_t *diffstat)
2790 {
2791 const char *name;
2792 const char *other;
2793 int complete_rewrite = 0;
2794
2795 if (DIFF_PAIR_UNMERGED(p)) {
2796 /* unmerged */
2797 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2798 return;
2799 }
2800
2801 name = p->one->path;
2802 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2803
2804 if (o->prefix_length)
2805 strip_prefix(o->prefix_length, &name, &other);
2806
2807 diff_fill_sha1_info(p->one);
2808 diff_fill_sha1_info(p->two);
2809
2810 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2811 complete_rewrite = 1;
2812 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2813 }
2814
2815 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2816 {
2817 const char *name;
2818 const char *other;
2819 const char *attr_path;
2820
2821 if (DIFF_PAIR_UNMERGED(p)) {
2822 /* unmerged */
2823 return;
2824 }
2825
2826 name = p->one->path;
2827 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2828 attr_path = other ? other : name;
2829
2830 if (o->prefix_length)
2831 strip_prefix(o->prefix_length, &name, &other);
2832
2833 diff_fill_sha1_info(p->one);
2834 diff_fill_sha1_info(p->two);
2835
2836 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2837 }
2838
2839 void diff_setup(struct diff_options *options)
2840 {
2841 memcpy(options, &default_diff_options, sizeof(*options));
2842
2843 options->file = stdout;
2844
2845 options->line_termination = '\n';
2846 options->break_opt = -1;
2847 options->rename_limit = -1;
2848 options->dirstat_percent = 3;
2849 options->context = 3;
2850
2851 options->change = diff_change;
2852 options->add_remove = diff_addremove;
2853 if (diff_use_color_default > 0)
2854 DIFF_OPT_SET(options, COLOR_DIFF);
2855 options->detect_rename = diff_detect_rename_default;
2856
2857 if (diff_no_prefix) {
2858 options->a_prefix = options->b_prefix = "";
2859 } else if (!diff_mnemonic_prefix) {
2860 options->a_prefix = "a/";
2861 options->b_prefix = "b/";
2862 }
2863 }
2864
2865 int diff_setup_done(struct diff_options *options)
2866 {
2867 int count = 0;
2868
2869 if (options->output_format & DIFF_FORMAT_NAME)
2870 count++;
2871 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2872 count++;
2873 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2874 count++;
2875 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2876 count++;
2877 if (count > 1)
2878 die("--name-only, --name-status, --check and -s are mutually exclusive");
2879
2880 /*
2881 * Most of the time we can say "there are changes"
2882 * only by checking if there are changed paths, but
2883 * --ignore-whitespace* options force us to look
2884 * inside contents.
2885 */
2886
2887 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
2888 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
2889 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
2890 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
2891 else
2892 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
2893
2894 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2895 options->detect_rename = DIFF_DETECT_COPY;
2896
2897 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2898 options->prefix = NULL;
2899 if (options->prefix)
2900 options->prefix_length = strlen(options->prefix);
2901 else
2902 options->prefix_length = 0;
2903
2904 if (options->output_format & (DIFF_FORMAT_NAME |
2905 DIFF_FORMAT_NAME_STATUS |
2906 DIFF_FORMAT_CHECKDIFF |
2907 DIFF_FORMAT_NO_OUTPUT))
2908 options->output_format &= ~(DIFF_FORMAT_RAW |
2909 DIFF_FORMAT_NUMSTAT |
2910 DIFF_FORMAT_DIFFSTAT |
2911 DIFF_FORMAT_SHORTSTAT |
2912 DIFF_FORMAT_DIRSTAT |
2913 DIFF_FORMAT_SUMMARY |
2914 DIFF_FORMAT_PATCH);
2915
2916 /*
2917 * These cases always need recursive; we do not drop caller-supplied
2918 * recursive bits for other formats here.
2919 */
2920 if (options->output_format & (DIFF_FORMAT_PATCH |
2921 DIFF_FORMAT_NUMSTAT |
2922 DIFF_FORMAT_DIFFSTAT |
2923 DIFF_FORMAT_SHORTSTAT |
2924 DIFF_FORMAT_DIRSTAT |
2925 DIFF_FORMAT_SUMMARY |
2926 DIFF_FORMAT_CHECKDIFF))
2927 DIFF_OPT_SET(options, RECURSIVE);
2928 /*
2929 * Also pickaxe would not work very well if you do not say recursive
2930 */
2931 if (options->pickaxe)
2932 DIFF_OPT_SET(options, RECURSIVE);
2933 /*
2934 * When patches are generated, submodules diffed against the work tree
2935 * must be checked for dirtiness too so it can be shown in the output
2936 */
2937 if (options->output_format & DIFF_FORMAT_PATCH)
2938 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
2939
2940 if (options->detect_rename && options->rename_limit < 0)
2941 options->rename_limit = diff_rename_limit_default;
2942 if (options->setup & DIFF_SETUP_USE_CACHE) {
2943 if (!active_cache)
2944 /* read-cache does not die even when it fails
2945 * so it is safe for us to do this here. Also
2946 * it does not smudge active_cache or active_nr
2947 * when it fails, so we do not have to worry about
2948 * cleaning it up ourselves either.
2949 */
2950 read_cache();
2951 }
2952 if (options->abbrev <= 0 || 40 < options->abbrev)
2953 options->abbrev = 40; /* full */
2954
2955 /*
2956 * It does not make sense to show the first hit we happened
2957 * to have found. It does not make sense not to return with
2958 * exit code in such a case either.
2959 */
2960 if (DIFF_OPT_TST(options, QUICK)) {
2961 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2962 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2963 }
2964
2965 return 0;
2966 }
2967
2968 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2969 {
2970 char c, *eq;
2971 int len;
2972
2973 if (*arg != '-')
2974 return 0;
2975 c = *++arg;
2976 if (!c)
2977 return 0;
2978 if (c == arg_short) {
2979 c = *++arg;
2980 if (!c)
2981 return 1;
2982 if (val && isdigit(c)) {
2983 char *end;
2984 int n = strtoul(arg, &end, 10);
2985 if (*end)
2986 return 0;
2987 *val = n;
2988 return 1;
2989 }
2990 return 0;
2991 }
2992 if (c != '-')
2993 return 0;
2994 arg++;
2995 eq = strchr(arg, '=');
2996 if (eq)
2997 len = eq - arg;
2998 else
2999 len = strlen(arg);
3000 if (!len || strncmp(arg, arg_long, len))
3001 return 0;
3002 if (eq) {
3003 int n;
3004 char *end;
3005 if (!isdigit(*++eq))
3006 return 0;
3007 n = strtoul(eq, &end, 10);
3008 if (*end)
3009 return 0;
3010 *val = n;
3011 }
3012 return 1;
3013 }
3014
3015 static int diff_scoreopt_parse(const char *opt);
3016
3017 static inline int short_opt(char opt, const char **argv,
3018 const char **optarg)
3019 {
3020 const char *arg = argv[0];
3021 if (arg[0] != '-' || arg[1] != opt)
3022 return 0;
3023 if (arg[2] != '\0') {
3024 *optarg = arg + 2;
3025 return 1;
3026 }
3027 if (!argv[1])
3028 die("Option '%c' requires a value", opt);
3029 *optarg = argv[1];
3030 return 2;
3031 }
3032
3033 int parse_long_opt(const char *opt, const char **argv,
3034 const char **optarg)
3035 {
3036 const char *arg = argv[0];
3037 if (arg[0] != '-' || arg[1] != '-')
3038 return 0;
3039 arg += strlen("--");
3040 if (prefixcmp(arg, opt))
3041 return 0;
3042 arg += strlen(opt);
3043 if (*arg == '=') { /* sticked form: --option=value */
3044 *optarg = arg + 1;
3045 return 1;
3046 }
3047 if (*arg != '\0')
3048 return 0;
3049 /* separate form: --option value */
3050 if (!argv[1])
3051 die("Option '--%s' requires a value", opt);
3052 *optarg = argv[1];
3053 return 2;
3054 }
3055
3056 static int stat_opt(struct diff_options *options, const char **av)
3057 {
3058 const char *arg = av[0];
3059 char *end;
3060 int width = options->stat_width;
3061 int name_width = options->stat_name_width;
3062 int argcount = 1;
3063
3064 arg += strlen("--stat");
3065 end = (char *)arg;
3066
3067 switch (*arg) {
3068 case '-':
3069 if (!prefixcmp(arg, "-width")) {
3070 arg += strlen("-width");
3071 if (*arg == '=')
3072 width = strtoul(arg + 1, &end, 10);
3073 else if (!*arg && !av[1])
3074 die("Option '--stat-width' requires a value");
3075 else if (!*arg) {
3076 width = strtoul(av[1], &end, 10);
3077 argcount = 2;
3078 }
3079 } else if (!prefixcmp(arg, "-name-width")) {
3080 arg += strlen("-name-width");
3081 if (*arg == '=')
3082 name_width = strtoul(arg + 1, &end, 10);
3083 else if (!*arg && !av[1])
3084 die("Option '--stat-name-width' requires a value");
3085 else if (!*arg) {
3086 name_width = strtoul(av[1], &end, 10);
3087 argcount = 2;
3088 }
3089 }
3090 break;
3091 case '=':
3092 width = strtoul(arg+1, &end, 10);
3093 if (*end == ',')
3094 name_width = strtoul(end+1, &end, 10);
3095 }
3096
3097 /* Important! This checks all the error cases! */
3098 if (*end)
3099 return 0;
3100 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3101 options->stat_name_width = name_width;
3102 options->stat_width = width;
3103 return argcount;
3104 }
3105
3106 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3107 {
3108 const char *arg = av[0];
3109 const char *optarg;
3110 int argcount;
3111
3112 /* Output format options */
3113 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3114 options->output_format |= DIFF_FORMAT_PATCH;
3115 else if (opt_arg(arg, 'U', "unified", &options->context))
3116 options->output_format |= DIFF_FORMAT_PATCH;
3117 else if (!strcmp(arg, "--raw"))
3118 options->output_format |= DIFF_FORMAT_RAW;
3119 else if (!strcmp(arg, "--patch-with-raw"))
3120 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3121 else if (!strcmp(arg, "--numstat"))
3122 options->output_format |= DIFF_FORMAT_NUMSTAT;
3123 else if (!strcmp(arg, "--shortstat"))
3124 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3125 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
3126 options->output_format |= DIFF_FORMAT_DIRSTAT;
3127 else if (!strcmp(arg, "--cumulative")) {
3128 options->output_format |= DIFF_FORMAT_DIRSTAT;
3129 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
3130 } else if (opt_arg(arg, 0, "dirstat-by-file",
3131 &options->dirstat_percent)) {
3132 options->output_format |= DIFF_FORMAT_DIRSTAT;
3133 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
3134 }
3135 else if (!strcmp(arg, "--check"))
3136 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3137 else if (!strcmp(arg, "--summary"))
3138 options->output_format |= DIFF_FORMAT_SUMMARY;
3139 else if (!strcmp(arg, "--patch-with-stat"))
3140 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3141 else if (!strcmp(arg, "--name-only"))
3142 options->output_format |= DIFF_FORMAT_NAME;
3143 else if (!strcmp(arg, "--name-status"))
3144 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3145 else if (!strcmp(arg, "-s"))
3146 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3147 else if (!prefixcmp(arg, "--stat"))
3148 /* --stat, --stat-width, or --stat-name-width */
3149 return stat_opt(options, av);
3150
3151 /* renames options */
3152 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3153 !strcmp(arg, "--break-rewrites")) {
3154 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3155 return error("invalid argument to -B: %s", arg+2);
3156 }
3157 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3158 !strcmp(arg, "--find-renames")) {
3159 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3160 return error("invalid argument to -M: %s", arg+2);
3161 options->detect_rename = DIFF_DETECT_RENAME;
3162 }
3163 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3164 !strcmp(arg, "--find-copies")) {
3165 if (options->detect_rename == DIFF_DETECT_COPY)
3166 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3167 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3168 return error("invalid argument to -C: %s", arg+2);
3169 options->detect_rename = DIFF_DETECT_COPY;
3170 }
3171 else if (!strcmp(arg, "--no-renames"))
3172 options->detect_rename = 0;
3173 else if (!strcmp(arg, "--relative"))
3174 DIFF_OPT_SET(options, RELATIVE_NAME);
3175 else if (!prefixcmp(arg, "--relative=")) {
3176 DIFF_OPT_SET(options, RELATIVE_NAME);
3177 options->prefix = arg + 11;
3178 }
3179
3180 /* xdiff options */
3181 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3182 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3183 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3184 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3185 else if (!strcmp(arg, "--ignore-space-at-eol"))
3186 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3187 else if (!strcmp(arg, "--patience"))
3188 DIFF_XDL_SET(options, PATIENCE_DIFF);
3189
3190 /* flags options */
3191 else if (!strcmp(arg, "--binary")) {
3192 options->output_format |= DIFF_FORMAT_PATCH;
3193 DIFF_OPT_SET(options, BINARY);
3194 }
3195 else if (!strcmp(arg, "--full-index"))
3196 DIFF_OPT_SET(options, FULL_INDEX);
3197 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3198 DIFF_OPT_SET(options, TEXT);
3199 else if (!strcmp(arg, "-R"))
3200 DIFF_OPT_SET(options, REVERSE_DIFF);
3201 else if (!strcmp(arg, "--find-copies-harder"))
3202 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3203 else if (!strcmp(arg, "--follow"))
3204 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3205 else if (!strcmp(arg, "--color"))
3206 DIFF_OPT_SET(options, COLOR_DIFF);
3207 else if (!prefixcmp(arg, "--color=")) {
3208 int value = git_config_colorbool(NULL, arg+8, -1);
3209 if (value == 0)
3210 DIFF_OPT_CLR(options, COLOR_DIFF);
3211 else if (value > 0)
3212 DIFF_OPT_SET(options, COLOR_DIFF);
3213 else
3214 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3215 }
3216 else if (!strcmp(arg, "--no-color"))
3217 DIFF_OPT_CLR(options, COLOR_DIFF);
3218 else if (!strcmp(arg, "--color-words")) {
3219 DIFF_OPT_SET(options, COLOR_DIFF);
3220 options->word_diff = DIFF_WORDS_COLOR;
3221 }
3222 else if (!prefixcmp(arg, "--color-words=")) {
3223 DIFF_OPT_SET(options, COLOR_DIFF);
3224 options->word_diff = DIFF_WORDS_COLOR;
3225 options->word_regex = arg + 14;
3226 }
3227 else if (!strcmp(arg, "--word-diff")) {
3228 if (options->word_diff == DIFF_WORDS_NONE)
3229 options->word_diff = DIFF_WORDS_PLAIN;
3230 }
3231 else if (!prefixcmp(arg, "--word-diff=")) {
3232 const char *type = arg + 12;
3233 if (!strcmp(type, "plain"))
3234 options->word_diff = DIFF_WORDS_PLAIN;
3235 else if (!strcmp(type, "color")) {
3236 DIFF_OPT_SET(options, COLOR_DIFF);
3237 options->word_diff = DIFF_WORDS_COLOR;
3238 }
3239 else if (!strcmp(type, "porcelain"))
3240 options->word_diff = DIFF_WORDS_PORCELAIN;
3241 else if (!strcmp(type, "none"))
3242 options->word_diff = DIFF_WORDS_NONE;
3243 else
3244 die("bad --word-diff argument: %s", type);
3245 }
3246 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3247 if (options->word_diff == DIFF_WORDS_NONE)
3248 options->word_diff = DIFF_WORDS_PLAIN;
3249 options->word_regex = optarg;
3250 return argcount;
3251 }
3252 else if (!strcmp(arg, "--exit-code"))
3253 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3254 else if (!strcmp(arg, "--quiet"))
3255 DIFF_OPT_SET(options, QUICK);
3256 else if (!strcmp(arg, "--ext-diff"))
3257 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3258 else if (!strcmp(arg, "--no-ext-diff"))
3259 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3260 else if (!strcmp(arg, "--textconv"))
3261 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3262 else if (!strcmp(arg, "--no-textconv"))
3263 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3264 else if (!strcmp(arg, "--ignore-submodules")) {
3265 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3266 handle_ignore_submodules_arg(options, "all");
3267 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3268 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3269 handle_ignore_submodules_arg(options, arg + 20);
3270 } else if (!strcmp(arg, "--submodule"))
3271 DIFF_OPT_SET(options, SUBMODULE_LOG);
3272 else if (!prefixcmp(arg, "--submodule=")) {
3273 if (!strcmp(arg + 12, "log"))
3274 DIFF_OPT_SET(options, SUBMODULE_LOG);
3275 }
3276
3277 /* misc options */
3278 else if (!strcmp(arg, "-z"))
3279 options->line_termination = 0;
3280 else if ((argcount = short_opt('l', av, &optarg))) {
3281 options->rename_limit = strtoul(optarg, NULL, 10);
3282 return argcount;
3283 }
3284 else if ((argcount = short_opt('S', av, &optarg))) {
3285 options->pickaxe = optarg;
3286 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3287 return argcount;
3288 } else if ((argcount = short_opt('G', av, &optarg))) {
3289 options->pickaxe = optarg;
3290 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3291 return argcount;
3292 }
3293 else if (!strcmp(arg, "--pickaxe-all"))
3294 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3295 else if (!strcmp(arg, "--pickaxe-regex"))
3296 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3297 else if ((argcount = short_opt('O', av, &optarg))) {
3298 options->orderfile = optarg;
3299 return argcount;
3300 }
3301 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3302 options->filter = optarg;
3303 return argcount;
3304 }
3305 else if (!strcmp(arg, "--abbrev"))
3306 options->abbrev = DEFAULT_ABBREV;
3307 else if (!prefixcmp(arg, "--abbrev=")) {
3308 options->abbrev = strtoul(arg + 9, NULL, 10);
3309 if (options->abbrev < MINIMUM_ABBREV)
3310 options->abbrev = MINIMUM_ABBREV;
3311 else if (40 < options->abbrev)
3312 options->abbrev = 40;
3313 }
3314 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3315 options->a_prefix = optarg;
3316 return argcount;
3317 }
3318 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3319 options->b_prefix = optarg;
3320 return argcount;
3321 }
3322 else if (!strcmp(arg, "--no-prefix"))
3323 options->a_prefix = options->b_prefix = "";
3324 else if (opt_arg(arg, '\0', "inter-hunk-context",
3325 &options->interhunkcontext))
3326 ;
3327 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3328 options->file = fopen(optarg, "w");
3329 if (!options->file)
3330 die_errno("Could not open '%s'", optarg);
3331 options->close_file = 1;
3332 return argcount;
3333 } else
3334 return 0;
3335 return 1;
3336 }
3337
3338 int parse_rename_score(const char **cp_p)
3339 {
3340 unsigned long num, scale;
3341 int ch, dot;
3342 const char *cp = *cp_p;
3343
3344 num = 0;
3345 scale = 1;
3346 dot = 0;
3347 for (;;) {
3348 ch = *cp;
3349 if ( !dot && ch == '.' ) {
3350 scale = 1;
3351 dot = 1;
3352 } else if ( ch == '%' ) {
3353 scale = dot ? scale*100 : 100;
3354 cp++; /* % is always at the end */
3355 break;
3356 } else if ( ch >= '0' && ch <= '9' ) {
3357 if ( scale < 100000 ) {
3358 scale *= 10;
3359 num = (num*10) + (ch-'0');
3360 }
3361 } else {
3362 break;
3363 }
3364 cp++;
3365 }
3366 *cp_p = cp;
3367
3368 /* user says num divided by scale and we say internally that
3369 * is MAX_SCORE * num / scale.
3370 */
3371 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3372 }
3373
3374 static int diff_scoreopt_parse(const char *opt)
3375 {
3376 int opt1, opt2, cmd;
3377
3378 if (*opt++ != '-')
3379 return -1;
3380 cmd = *opt++;
3381 if (cmd == '-') {
3382 /* convert the long-form arguments into short-form versions */
3383 if (!prefixcmp(opt, "break-rewrites")) {
3384 opt += strlen("break-rewrites");
3385 if (*opt == 0 || *opt++ == '=')
3386 cmd = 'B';
3387 } else if (!prefixcmp(opt, "find-copies")) {
3388 opt += strlen("find-copies");
3389 if (*opt == 0 || *opt++ == '=')
3390 cmd = 'C';
3391 } else if (!prefixcmp(opt, "find-renames")) {
3392 opt += strlen("find-renames");
3393 if (*opt == 0 || *opt++ == '=')
3394 cmd = 'M';
3395 }
3396 }
3397 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3398 return -1; /* that is not a -M, -C nor -B option */
3399
3400 opt1 = parse_rename_score(&opt);
3401 if (cmd != 'B')
3402 opt2 = 0;
3403 else {
3404 if (*opt == 0)
3405 opt2 = 0;
3406 else if (*opt != '/')
3407 return -1; /* we expect -B80/99 or -B80 */
3408 else {
3409 opt++;
3410 opt2 = parse_rename_score(&opt);
3411 }
3412 }
3413 if (*opt != 0)
3414 return -1;
3415 return opt1 | (opt2 << 16);
3416 }
3417
3418 struct diff_queue_struct diff_queued_diff;
3419
3420 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3421 {
3422 if (queue->alloc <= queue->nr) {
3423 queue->alloc = alloc_nr(queue->alloc);
3424 queue->queue = xrealloc(queue->queue,
3425 sizeof(dp) * queue->alloc);
3426 }
3427 queue->queue[queue->nr++] = dp;
3428 }
3429
3430 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3431 struct diff_filespec *one,
3432 struct diff_filespec *two)
3433 {
3434 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3435 dp->one = one;
3436 dp->two = two;
3437 if (queue)
3438 diff_q(queue, dp);
3439 return dp;
3440 }
3441
3442 void diff_free_filepair(struct diff_filepair *p)
3443 {
3444 free_filespec(p->one);
3445 free_filespec(p->two);
3446 free(p);
3447 }
3448
3449 /* This is different from find_unique_abbrev() in that
3450 * it stuffs the result with dots for alignment.
3451 */
3452 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3453 {
3454 int abblen;
3455 const char *abbrev;
3456 if (len == 40)
3457 return sha1_to_hex(sha1);
3458
3459 abbrev = find_unique_abbrev(sha1, len);
3460 abblen = strlen(abbrev);
3461 if (abblen < 37) {
3462 static char hex[41];
3463 if (len < abblen && abblen <= len + 2)
3464 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3465 else
3466 sprintf(hex, "%s...", abbrev);
3467 return hex;
3468 }
3469 return sha1_to_hex(sha1);
3470 }
3471
3472 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3473 {
3474 int line_termination = opt->line_termination;
3475 int inter_name_termination = line_termination ? '\t' : '\0';
3476 if (opt->output_prefix) {
3477 struct strbuf *msg = NULL;
3478 msg = opt->output_prefix(opt, opt->output_prefix_data);
3479 fprintf(opt->file, "%s", msg->buf);
3480 }
3481
3482 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3483 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3484 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3485 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3486 }
3487 if (p->score) {
3488 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3489 inter_name_termination);
3490 } else {
3491 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3492 }
3493
3494 if (p->status == DIFF_STATUS_COPIED ||
3495 p->status == DIFF_STATUS_RENAMED) {
3496 const char *name_a, *name_b;
3497 name_a = p->one->path;
3498 name_b = p->two->path;
3499 strip_prefix(opt->prefix_length, &name_a, &name_b);
3500 write_name_quoted(name_a, opt->file, inter_name_termination);
3501 write_name_quoted(name_b, opt->file, line_termination);
3502 } else {
3503 const char *name_a, *name_b;
3504 name_a = p->one->mode ? p->one->path : p->two->path;
3505 name_b = NULL;
3506 strip_prefix(opt->prefix_length, &name_a, &name_b);
3507 write_name_quoted(name_a, opt->file, line_termination);
3508 }
3509 }
3510
3511 int diff_unmodified_pair(struct diff_filepair *p)
3512 {
3513 /* This function is written stricter than necessary to support
3514 * the currently implemented transformers, but the idea is to
3515 * let transformers to produce diff_filepairs any way they want,
3516 * and filter and clean them up here before producing the output.
3517 */
3518 struct diff_filespec *one = p->one, *two = p->two;
3519
3520 if (DIFF_PAIR_UNMERGED(p))
3521 return 0; /* unmerged is interesting */
3522
3523 /* deletion, addition, mode or type change
3524 * and rename are all interesting.
3525 */
3526 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3527 DIFF_PAIR_MODE_CHANGED(p) ||
3528 strcmp(one->path, two->path))
3529 return 0;
3530
3531 /* both are valid and point at the same path. that is, we are
3532 * dealing with a change.
3533 */
3534 if (one->sha1_valid && two->sha1_valid &&
3535 !hashcmp(one->sha1, two->sha1) &&
3536 !one->dirty_submodule && !two->dirty_submodule)
3537 return 1; /* no change */
3538 if (!one->sha1_valid && !two->sha1_valid)
3539 return 1; /* both look at the same file on the filesystem. */
3540 return 0;
3541 }
3542
3543 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3544 {
3545 if (diff_unmodified_pair(p))
3546 return;
3547
3548 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3549 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3550 return; /* no tree diffs in patch format */
3551
3552 run_diff(p, o);
3553 }
3554
3555 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3556 struct diffstat_t *diffstat)
3557 {
3558 if (diff_unmodified_pair(p))
3559 return;
3560
3561 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3562 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3563 return; /* no useful stat for tree diffs */
3564
3565 run_diffstat(p, o, diffstat);
3566 }
3567
3568 static void diff_flush_checkdiff(struct diff_filepair *p,
3569 struct diff_options *o)
3570 {
3571 if (diff_unmodified_pair(p))
3572 return;
3573
3574 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3575 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3576 return; /* nothing to check in tree diffs */
3577
3578 run_checkdiff(p, o);
3579 }
3580
3581 int diff_queue_is_empty(void)
3582 {
3583 struct diff_queue_struct *q = &diff_queued_diff;
3584 int i;
3585 for (i = 0; i < q->nr; i++)
3586 if (!diff_unmodified_pair(q->queue[i]))
3587 return 0;
3588 return 1;
3589 }
3590
3591 #if DIFF_DEBUG
3592 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3593 {
3594 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3595 x, one ? one : "",
3596 s->path,
3597 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3598 s->mode,
3599 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3600 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3601 x, one ? one : "",
3602 s->size, s->xfrm_flags);
3603 }
3604
3605 void diff_debug_filepair(const struct diff_filepair *p, int i)
3606 {
3607 diff_debug_filespec(p->one, i, "one");
3608 diff_debug_filespec(p->two, i, "two");
3609 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3610 p->score, p->status ? p->status : '?',
3611 p->one->rename_used, p->broken_pair);
3612 }
3613
3614 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3615 {
3616 int i;
3617 if (msg)
3618 fprintf(stderr, "%s\n", msg);
3619 fprintf(stderr, "q->nr = %d\n", q->nr);
3620 for (i = 0; i < q->nr; i++) {
3621 struct diff_filepair *p = q->queue[i];
3622 diff_debug_filepair(p, i);
3623 }
3624 }
3625 #endif
3626
3627 static void diff_resolve_rename_copy(void)
3628 {
3629 int i;
3630 struct diff_filepair *p;
3631 struct diff_queue_struct *q = &diff_queued_diff;
3632
3633 diff_debug_queue("resolve-rename-copy", q);
3634
3635 for (i = 0; i < q->nr; i++) {
3636 p = q->queue[i];
3637 p->status = 0; /* undecided */
3638 if (DIFF_PAIR_UNMERGED(p))
3639 p->status = DIFF_STATUS_UNMERGED;
3640 else if (!DIFF_FILE_VALID(p->one))
3641 p->status = DIFF_STATUS_ADDED;
3642 else if (!DIFF_FILE_VALID(p->two))
3643 p->status = DIFF_STATUS_DELETED;
3644 else if (DIFF_PAIR_TYPE_CHANGED(p))
3645 p->status = DIFF_STATUS_TYPE_CHANGED;
3646
3647 /* from this point on, we are dealing with a pair
3648 * whose both sides are valid and of the same type, i.e.
3649 * either in-place edit or rename/copy edit.
3650 */
3651 else if (DIFF_PAIR_RENAME(p)) {
3652 /*
3653 * A rename might have re-connected a broken
3654 * pair up, causing the pathnames to be the
3655 * same again. If so, that's not a rename at
3656 * all, just a modification..
3657 *
3658 * Otherwise, see if this source was used for
3659 * multiple renames, in which case we decrement
3660 * the count, and call it a copy.
3661 */
3662 if (!strcmp(p->one->path, p->two->path))
3663 p->status = DIFF_STATUS_MODIFIED;
3664 else if (--p->one->rename_used > 0)
3665 p->status = DIFF_STATUS_COPIED;
3666 else
3667 p->status = DIFF_STATUS_RENAMED;
3668 }
3669 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3670 p->one->mode != p->two->mode ||
3671 p->one->dirty_submodule ||
3672 p->two->dirty_submodule ||
3673 is_null_sha1(p->one->sha1))
3674 p->status = DIFF_STATUS_MODIFIED;
3675 else {
3676 /* This is a "no-change" entry and should not
3677 * happen anymore, but prepare for broken callers.
3678 */
3679 error("feeding unmodified %s to diffcore",
3680 p->one->path);
3681 p->status = DIFF_STATUS_UNKNOWN;
3682 }
3683 }
3684 diff_debug_queue("resolve-rename-copy done", q);
3685 }
3686
3687 static int check_pair_status(struct diff_filepair *p)
3688 {
3689 switch (p->status) {
3690 case DIFF_STATUS_UNKNOWN:
3691 return 0;
3692 case 0:
3693 die("internal error in diff-resolve-rename-copy");
3694 default:
3695 return 1;
3696 }
3697 }
3698
3699 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3700 {
3701 int fmt = opt->output_format;
3702
3703 if (fmt & DIFF_FORMAT_CHECKDIFF)
3704 diff_flush_checkdiff(p, opt);
3705 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3706 diff_flush_raw(p, opt);
3707 else if (fmt & DIFF_FORMAT_NAME) {
3708 const char *name_a, *name_b;
3709 name_a = p->two->path;
3710 name_b = NULL;
3711 strip_prefix(opt->prefix_length, &name_a, &name_b);
3712 write_name_quoted(name_a, opt->file, opt->line_termination);
3713 }
3714 }
3715
3716 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3717 {
3718 if (fs->mode)
3719 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3720 else
3721 fprintf(file, " %s ", newdelete);
3722 write_name_quoted(fs->path, file, '\n');
3723 }
3724
3725
3726 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
3727 const char *line_prefix)
3728 {
3729 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3730 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
3731 p->two->mode, show_name ? ' ' : '\n');
3732 if (show_name) {
3733 write_name_quoted(p->two->path, file, '\n');
3734 }
3735 }
3736 }
3737
3738 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
3739 const char *line_prefix)
3740 {
3741 char *names = pprint_rename(p->one->path, p->two->path);
3742
3743 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3744 free(names);
3745 show_mode_change(file, p, 0, line_prefix);
3746 }
3747
3748 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
3749 {
3750 FILE *file = opt->file;
3751 char *line_prefix = "";
3752
3753 if (opt->output_prefix) {
3754 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
3755 line_prefix = buf->buf;
3756 }
3757
3758 switch(p->status) {
3759 case DIFF_STATUS_DELETED:
3760 fputs(line_prefix, file);
3761 show_file_mode_name(file, "delete", p->one);
3762 break;
3763 case DIFF_STATUS_ADDED:
3764 fputs(line_prefix, file);
3765 show_file_mode_name(file, "create", p->two);
3766 break;
3767 case DIFF_STATUS_COPIED:
3768 fputs(line_prefix, file);
3769 show_rename_copy(file, "copy", p, line_prefix);
3770 break;
3771 case DIFF_STATUS_RENAMED:
3772 fputs(line_prefix, file);
3773 show_rename_copy(file, "rename", p, line_prefix);
3774 break;
3775 default:
3776 if (p->score) {
3777 fprintf(file, "%s rewrite ", line_prefix);
3778 write_name_quoted(p->two->path, file, ' ');
3779 fprintf(file, "(%d%%)\n", similarity_index(p));
3780 }
3781 show_mode_change(file, p, !p->score, line_prefix);
3782 break;
3783 }
3784 }
3785
3786 struct patch_id_t {
3787 git_SHA_CTX *ctx;
3788 int patchlen;
3789 };
3790
3791 static int remove_space(char *line, int len)
3792 {
3793 int i;
3794 char *dst = line;
3795 unsigned char c;
3796
3797 for (i = 0; i < len; i++)
3798 if (!isspace((c = line[i])))
3799 *dst++ = c;
3800
3801 return dst - line;
3802 }
3803
3804 static void patch_id_consume(void *priv, char *line, unsigned long len)
3805 {
3806 struct patch_id_t *data = priv;
3807 int new_len;
3808
3809 /* Ignore line numbers when computing the SHA1 of the patch */
3810 if (!prefixcmp(line, "@@ -"))
3811 return;
3812
3813 new_len = remove_space(line, len);
3814
3815 git_SHA1_Update(data->ctx, line, new_len);
3816 data->patchlen += new_len;
3817 }
3818
3819 /* returns 0 upon success, and writes result into sha1 */
3820 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3821 {
3822 struct diff_queue_struct *q = &diff_queued_diff;
3823 int i;
3824 git_SHA_CTX ctx;
3825 struct patch_id_t data;
3826 char buffer[PATH_MAX * 4 + 20];
3827
3828 git_SHA1_Init(&ctx);
3829 memset(&data, 0, sizeof(struct patch_id_t));
3830 data.ctx = &ctx;
3831
3832 for (i = 0; i < q->nr; i++) {
3833 xpparam_t xpp;
3834 xdemitconf_t xecfg;
3835 mmfile_t mf1, mf2;
3836 struct diff_filepair *p = q->queue[i];
3837 int len1, len2;
3838
3839 memset(&xpp, 0, sizeof(xpp));
3840 memset(&xecfg, 0, sizeof(xecfg));
3841 if (p->status == 0)
3842 return error("internal diff status error");
3843 if (p->status == DIFF_STATUS_UNKNOWN)
3844 continue;
3845 if (diff_unmodified_pair(p))
3846 continue;
3847 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3848 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3849 continue;
3850 if (DIFF_PAIR_UNMERGED(p))
3851 continue;
3852
3853 diff_fill_sha1_info(p->one);
3854 diff_fill_sha1_info(p->two);
3855 if (fill_mmfile(&mf1, p->one) < 0 ||
3856 fill_mmfile(&mf2, p->two) < 0)
3857 return error("unable to read files to diff");
3858
3859 len1 = remove_space(p->one->path, strlen(p->one->path));
3860 len2 = remove_space(p->two->path, strlen(p->two->path));
3861 if (p->one->mode == 0)
3862 len1 = snprintf(buffer, sizeof(buffer),
3863 "diff--gita/%.*sb/%.*s"
3864 "newfilemode%06o"
3865 "---/dev/null"
3866 "+++b/%.*s",
3867 len1, p->one->path,
3868 len2, p->two->path,
3869 p->two->mode,
3870 len2, p->two->path);
3871 else if (p->two->mode == 0)
3872 len1 = snprintf(buffer, sizeof(buffer),
3873 "diff--gita/%.*sb/%.*s"
3874 "deletedfilemode%06o"
3875 "---a/%.*s"
3876 "+++/dev/null",
3877 len1, p->one->path,
3878 len2, p->two->path,
3879 p->one->mode,
3880 len1, p->one->path);
3881 else
3882 len1 = snprintf(buffer, sizeof(buffer),
3883 "diff--gita/%.*sb/%.*s"
3884 "---a/%.*s"
3885 "+++b/%.*s",
3886 len1, p->one->path,
3887 len2, p->two->path,
3888 len1, p->one->path,
3889 len2, p->two->path);
3890 git_SHA1_Update(&ctx, buffer, len1);
3891
3892 if (diff_filespec_is_binary(p->one) ||
3893 diff_filespec_is_binary(p->two)) {
3894 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
3895 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
3896 continue;
3897 }
3898
3899 xpp.flags = 0;
3900 xecfg.ctxlen = 3;
3901 xecfg.flags = 0;
3902 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3903 &xpp, &xecfg);
3904 }
3905
3906 git_SHA1_Final(sha1, &ctx);
3907 return 0;
3908 }
3909
3910 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3911 {
3912 struct diff_queue_struct *q = &diff_queued_diff;
3913 int i;
3914 int result = diff_get_patch_id(options, sha1);
3915
3916 for (i = 0; i < q->nr; i++)
3917 diff_free_filepair(q->queue[i]);
3918
3919 free(q->queue);
3920 DIFF_QUEUE_CLEAR(q);
3921
3922 return result;
3923 }
3924
3925 static int is_summary_empty(const struct diff_queue_struct *q)
3926 {
3927 int i;
3928
3929 for (i = 0; i < q->nr; i++) {
3930 const struct diff_filepair *p = q->queue[i];
3931
3932 switch (p->status) {
3933 case DIFF_STATUS_DELETED:
3934 case DIFF_STATUS_ADDED:
3935 case DIFF_STATUS_COPIED:
3936 case DIFF_STATUS_RENAMED:
3937 return 0;
3938 default:
3939 if (p->score)
3940 return 0;
3941 if (p->one->mode && p->two->mode &&
3942 p->one->mode != p->two->mode)
3943 return 0;
3944 break;
3945 }
3946 }
3947 return 1;
3948 }
3949
3950 void diff_flush(struct diff_options *options)
3951 {
3952 struct diff_queue_struct *q = &diff_queued_diff;
3953 int i, output_format = options->output_format;
3954 int separator = 0;
3955
3956 /*
3957 * Order: raw, stat, summary, patch
3958 * or: name/name-status/checkdiff (other bits clear)
3959 */
3960 if (!q->nr)
3961 goto free_queue;
3962
3963 if (output_format & (DIFF_FORMAT_RAW |
3964 DIFF_FORMAT_NAME |
3965 DIFF_FORMAT_NAME_STATUS |
3966 DIFF_FORMAT_CHECKDIFF)) {
3967 for (i = 0; i < q->nr; i++) {
3968 struct diff_filepair *p = q->queue[i];
3969 if (check_pair_status(p))
3970 flush_one_pair(p, options);
3971 }
3972 separator++;
3973 }
3974
3975 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3976 struct diffstat_t diffstat;
3977
3978 memset(&diffstat, 0, sizeof(struct diffstat_t));
3979 for (i = 0; i < q->nr; i++) {
3980 struct diff_filepair *p = q->queue[i];
3981 if (check_pair_status(p))
3982 diff_flush_stat(p, options, &diffstat);
3983 }
3984 if (output_format & DIFF_FORMAT_NUMSTAT)
3985 show_numstat(&diffstat, options);
3986 if (output_format & DIFF_FORMAT_DIFFSTAT)
3987 show_stats(&diffstat, options);
3988 if (output_format & DIFF_FORMAT_SHORTSTAT)
3989 show_shortstats(&diffstat, options);
3990 free_diffstat_info(&diffstat);
3991 separator++;
3992 }
3993 if (output_format & DIFF_FORMAT_DIRSTAT)
3994 show_dirstat(options);
3995
3996 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3997 for (i = 0; i < q->nr; i++) {
3998 diff_summary(options, q->queue[i]);
3999 }
4000 separator++;
4001 }
4002
4003 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4004 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4005 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4006 /*
4007 * run diff_flush_patch for the exit status. setting
4008 * options->file to /dev/null should be safe, becaue we
4009 * aren't supposed to produce any output anyway.
4010 */
4011 if (options->close_file)
4012 fclose(options->file);
4013 options->file = fopen("/dev/null", "w");
4014 if (!options->file)
4015 die_errno("Could not open /dev/null");
4016 options->close_file = 1;
4017 for (i = 0; i < q->nr; i++) {
4018 struct diff_filepair *p = q->queue[i];
4019 if (check_pair_status(p))
4020 diff_flush_patch(p, options);
4021 if (options->found_changes)
4022 break;
4023 }
4024 }
4025
4026 if (output_format & DIFF_FORMAT_PATCH) {
4027 if (separator) {
4028 putc(options->line_termination, options->file);
4029 if (options->stat_sep) {
4030 /* attach patch instead of inline */
4031 fputs(options->stat_sep, options->file);
4032 }
4033 }
4034
4035 for (i = 0; i < q->nr; i++) {
4036 struct diff_filepair *p = q->queue[i];
4037 if (check_pair_status(p))
4038 diff_flush_patch(p, options);
4039 }
4040 }
4041
4042 if (output_format & DIFF_FORMAT_CALLBACK)
4043 options->format_callback(q, options, options->format_callback_data);
4044
4045 for (i = 0; i < q->nr; i++)
4046 diff_free_filepair(q->queue[i]);
4047 free_queue:
4048 free(q->queue);
4049 DIFF_QUEUE_CLEAR(q);
4050 if (options->close_file)
4051 fclose(options->file);
4052
4053 /*
4054 * Report the content-level differences with HAS_CHANGES;
4055 * diff_addremove/diff_change does not set the bit when
4056 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4057 */
4058 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4059 if (options->found_changes)
4060 DIFF_OPT_SET(options, HAS_CHANGES);
4061 else
4062 DIFF_OPT_CLR(options, HAS_CHANGES);
4063 }
4064 }
4065
4066 static void diffcore_apply_filter(const char *filter)
4067 {
4068 int i;
4069 struct diff_queue_struct *q = &diff_queued_diff;
4070 struct diff_queue_struct outq;
4071 DIFF_QUEUE_CLEAR(&outq);
4072
4073 if (!filter)
4074 return;
4075
4076 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4077 int found;
4078 for (i = found = 0; !found && i < q->nr; i++) {
4079 struct diff_filepair *p = q->queue[i];
4080 if (((p->status == DIFF_STATUS_MODIFIED) &&
4081 ((p->score &&
4082 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4083 (!p->score &&
4084 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4085 ((p->status != DIFF_STATUS_MODIFIED) &&
4086 strchr(filter, p->status)))
4087 found++;
4088 }
4089 if (found)
4090 return;
4091
4092 /* otherwise we will clear the whole queue
4093 * by copying the empty outq at the end of this
4094 * function, but first clear the current entries
4095 * in the queue.
4096 */
4097 for (i = 0; i < q->nr; i++)
4098 diff_free_filepair(q->queue[i]);
4099 }
4100 else {
4101 /* Only the matching ones */
4102 for (i = 0; i < q->nr; i++) {
4103 struct diff_filepair *p = q->queue[i];
4104
4105 if (((p->status == DIFF_STATUS_MODIFIED) &&
4106 ((p->score &&
4107 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4108 (!p->score &&
4109 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4110 ((p->status != DIFF_STATUS_MODIFIED) &&
4111 strchr(filter, p->status)))
4112 diff_q(&outq, p);
4113 else
4114 diff_free_filepair(p);
4115 }
4116 }
4117 free(q->queue);
4118 *q = outq;
4119 }
4120
4121 /* Check whether two filespecs with the same mode and size are identical */
4122 static int diff_filespec_is_identical(struct diff_filespec *one,
4123 struct diff_filespec *two)
4124 {
4125 if (S_ISGITLINK(one->mode))
4126 return 0;
4127 if (diff_populate_filespec(one, 0))
4128 return 0;
4129 if (diff_populate_filespec(two, 0))
4130 return 0;
4131 return !memcmp(one->data, two->data, one->size);
4132 }
4133
4134 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4135 {
4136 int i;
4137 struct diff_queue_struct *q = &diff_queued_diff;
4138 struct diff_queue_struct outq;
4139 DIFF_QUEUE_CLEAR(&outq);
4140
4141 for (i = 0; i < q->nr; i++) {
4142 struct diff_filepair *p = q->queue[i];
4143
4144 /*
4145 * 1. Entries that come from stat info dirtiness
4146 * always have both sides (iow, not create/delete),
4147 * one side of the object name is unknown, with
4148 * the same mode and size. Keep the ones that
4149 * do not match these criteria. They have real
4150 * differences.
4151 *
4152 * 2. At this point, the file is known to be modified,
4153 * with the same mode and size, and the object
4154 * name of one side is unknown. Need to inspect
4155 * the identical contents.
4156 */
4157 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4158 !DIFF_FILE_VALID(p->two) ||
4159 (p->one->sha1_valid && p->two->sha1_valid) ||
4160 (p->one->mode != p->two->mode) ||
4161 diff_populate_filespec(p->one, 1) ||
4162 diff_populate_filespec(p->two, 1) ||
4163 (p->one->size != p->two->size) ||
4164 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4165 diff_q(&outq, p);
4166 else {
4167 /*
4168 * The caller can subtract 1 from skip_stat_unmatch
4169 * to determine how many paths were dirty only
4170 * due to stat info mismatch.
4171 */
4172 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4173 diffopt->skip_stat_unmatch++;
4174 diff_free_filepair(p);
4175 }
4176 }
4177 free(q->queue);
4178 *q = outq;
4179 }
4180
4181 static int diffnamecmp(const void *a_, const void *b_)
4182 {
4183 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4184 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4185 const char *name_a, *name_b;
4186
4187 name_a = a->one ? a->one->path : a->two->path;
4188 name_b = b->one ? b->one->path : b->two->path;
4189 return strcmp(name_a, name_b);
4190 }
4191
4192 void diffcore_fix_diff_index(struct diff_options *options)
4193 {
4194 struct diff_queue_struct *q = &diff_queued_diff;
4195 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4196 }
4197
4198 void diffcore_std(struct diff_options *options)
4199 {
4200 if (options->skip_stat_unmatch)
4201 diffcore_skip_stat_unmatch(options);
4202 if (!options->found_follow) {
4203 /* See try_to_follow_renames() in tree-diff.c */
4204 if (options->break_opt != -1)
4205 diffcore_break(options->break_opt);
4206 if (options->detect_rename)
4207 diffcore_rename(options);
4208 if (options->break_opt != -1)
4209 diffcore_merge_broken();
4210 }
4211 if (options->pickaxe)
4212 diffcore_pickaxe(options);
4213 if (options->orderfile)
4214 diffcore_order(options->orderfile);
4215 if (!options->found_follow)
4216 /* See try_to_follow_renames() in tree-diff.c */
4217 diff_resolve_rename_copy();
4218 diffcore_apply_filter(options->filter);
4219
4220 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4221 DIFF_OPT_SET(options, HAS_CHANGES);
4222 else
4223 DIFF_OPT_CLR(options, HAS_CHANGES);
4224
4225 options->found_follow = 0;
4226 }
4227
4228 int diff_result_code(struct diff_options *opt, int status)
4229 {
4230 int result = 0;
4231 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4232 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4233 return status;
4234 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4235 DIFF_OPT_TST(opt, HAS_CHANGES))
4236 result |= 01;
4237 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4238 DIFF_OPT_TST(opt, CHECK_FAILED))
4239 result |= 02;
4240 return result;
4241 }
4242
4243 /*
4244 * Shall changes to this submodule be ignored?
4245 *
4246 * Submodule changes can be configured to be ignored separately for each path,
4247 * but that configuration can be overridden from the command line.
4248 */
4249 static int is_submodule_ignored(const char *path, struct diff_options *options)
4250 {
4251 int ignored = 0;
4252 unsigned orig_flags = options->flags;
4253 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4254 set_diffopt_flags_from_submodule_config(options, path);
4255 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4256 ignored = 1;
4257 options->flags = orig_flags;
4258 return ignored;
4259 }
4260
4261 void diff_addremove(struct diff_options *options,
4262 int addremove, unsigned mode,
4263 const unsigned char *sha1,
4264 const char *concatpath, unsigned dirty_submodule)
4265 {
4266 struct diff_filespec *one, *two;
4267
4268 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4269 return;
4270
4271 /* This may look odd, but it is a preparation for
4272 * feeding "there are unchanged files which should
4273 * not produce diffs, but when you are doing copy
4274 * detection you would need them, so here they are"
4275 * entries to the diff-core. They will be prefixed
4276 * with something like '=' or '*' (I haven't decided
4277 * which but should not make any difference).
4278 * Feeding the same new and old to diff_change()
4279 * also has the same effect.
4280 * Before the final output happens, they are pruned after
4281 * merged into rename/copy pairs as appropriate.
4282 */
4283 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4284 addremove = (addremove == '+' ? '-' :
4285 addremove == '-' ? '+' : addremove);
4286
4287 if (options->prefix &&
4288 strncmp(concatpath, options->prefix, options->prefix_length))
4289 return;
4290
4291 one = alloc_filespec(concatpath);
4292 two = alloc_filespec(concatpath);
4293
4294 if (addremove != '+')
4295 fill_filespec(one, sha1, mode);
4296 if (addremove != '-') {
4297 fill_filespec(two, sha1, mode);
4298 two->dirty_submodule = dirty_submodule;
4299 }
4300
4301 diff_queue(&diff_queued_diff, one, two);
4302 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4303 DIFF_OPT_SET(options, HAS_CHANGES);
4304 }
4305
4306 void diff_change(struct diff_options *options,
4307 unsigned old_mode, unsigned new_mode,
4308 const unsigned char *old_sha1,
4309 const unsigned char *new_sha1,
4310 const char *concatpath,
4311 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4312 {
4313 struct diff_filespec *one, *two;
4314
4315 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4316 is_submodule_ignored(concatpath, options))
4317 return;
4318
4319 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4320 unsigned tmp;
4321 const unsigned char *tmp_c;
4322 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4323 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4324 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4325 new_dirty_submodule = tmp;
4326 }
4327
4328 if (options->prefix &&
4329 strncmp(concatpath, options->prefix, options->prefix_length))
4330 return;
4331
4332 one = alloc_filespec(concatpath);
4333 two = alloc_filespec(concatpath);
4334 fill_filespec(one, old_sha1, old_mode);
4335 fill_filespec(two, new_sha1, new_mode);
4336 one->dirty_submodule = old_dirty_submodule;
4337 two->dirty_submodule = new_dirty_submodule;
4338
4339 diff_queue(&diff_queued_diff, one, two);
4340 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4341 DIFF_OPT_SET(options, HAS_CHANGES);
4342 }
4343
4344 void diff_unmerge(struct diff_options *options,
4345 const char *path,
4346 unsigned mode, const unsigned char *sha1)
4347 {
4348 struct diff_filespec *one, *two;
4349
4350 if (options->prefix &&
4351 strncmp(path, options->prefix, options->prefix_length))
4352 return;
4353
4354 one = alloc_filespec(path);
4355 two = alloc_filespec(path);
4356 fill_filespec(one, sha1, mode);
4357 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
4358 }
4359
4360 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4361 size_t *outsize)
4362 {
4363 struct diff_tempfile *temp;
4364 const char *argv[3];
4365 const char **arg = argv;
4366 struct child_process child;
4367 struct strbuf buf = STRBUF_INIT;
4368 int err = 0;
4369
4370 temp = prepare_temp_file(spec->path, spec);
4371 *arg++ = pgm;
4372 *arg++ = temp->name;
4373 *arg = NULL;
4374
4375 memset(&child, 0, sizeof(child));
4376 child.use_shell = 1;
4377 child.argv = argv;
4378 child.out = -1;
4379 if (start_command(&child)) {
4380 remove_tempfile();
4381 return NULL;
4382 }
4383
4384 if (strbuf_read(&buf, child.out, 0) < 0)
4385 err = error("error reading from textconv command '%s'", pgm);
4386 close(child.out);
4387
4388 if (finish_command(&child) || err) {
4389 strbuf_release(&buf);
4390 remove_tempfile();
4391 return NULL;
4392 }
4393 remove_tempfile();
4394
4395 return strbuf_detach(&buf, outsize);
4396 }
4397
4398 size_t fill_textconv(struct userdiff_driver *driver,
4399 struct diff_filespec *df,
4400 char **outbuf)
4401 {
4402 size_t size;
4403
4404 if (!driver || !driver->textconv) {
4405 if (!DIFF_FILE_VALID(df)) {
4406 *outbuf = "";
4407 return 0;
4408 }
4409 if (diff_populate_filespec(df, 0))
4410 die("unable to read files to diff");
4411 *outbuf = df->data;
4412 return df->size;
4413 }
4414
4415 if (driver->textconv_cache && df->sha1_valid) {
4416 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4417 &size);
4418 if (*outbuf)
4419 return size;
4420 }
4421
4422 *outbuf = run_textconv(driver->textconv, df, &size);
4423 if (!*outbuf)
4424 die("unable to read files to diff");
4425
4426 if (driver->textconv_cache && df->sha1_valid) {
4427 /* ignore errors, as we might be in a readonly repository */
4428 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4429 size);
4430 /*
4431 * we could save up changes and flush them all at the end,
4432 * but we would need an extra call after all diffing is done.
4433 * Since generating a cache entry is the slow path anyway,
4434 * this extra overhead probably isn't a big deal.
4435 */
4436 notes_cache_write(driver->textconv_cache);
4437 }
4438
4439 return size;
4440 }
Yann's patches for git