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SubmittingPatches: Cite the 50 char subject limit
[git.git] / diff.c
blob17873f3d9e88fccbf98e790d243397dcc4ccb24b
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
35 static char diff_colors[][COLOR_MAXLEN] = {
36 GIT_COLOR_RESET,
37 GIT_COLOR_NORMAL, /* PLAIN */
38 GIT_COLOR_BOLD, /* METAINFO */
39 GIT_COLOR_CYAN, /* FRAGINFO */
40 GIT_COLOR_RED, /* OLD */
41 GIT_COLOR_GREEN, /* NEW */
42 GIT_COLOR_YELLOW, /* COMMIT */
43 GIT_COLOR_BG_RED, /* WHITESPACE */
44 GIT_COLOR_NORMAL, /* FUNCINFO */
45 };
46
47 static int parse_diff_color_slot(const char *var, int ofs)
48 {
49 if (!strcasecmp(var+ofs, "plain"))
50 return DIFF_PLAIN;
51 if (!strcasecmp(var+ofs, "meta"))
52 return DIFF_METAINFO;
53 if (!strcasecmp(var+ofs, "frag"))
54 return DIFF_FRAGINFO;
55 if (!strcasecmp(var+ofs, "old"))
56 return DIFF_FILE_OLD;
57 if (!strcasecmp(var+ofs, "new"))
58 return DIFF_FILE_NEW;
59 if (!strcasecmp(var+ofs, "commit"))
60 return DIFF_COMMIT;
61 if (!strcasecmp(var+ofs, "whitespace"))
62 return DIFF_WHITESPACE;
63 if (!strcasecmp(var+ofs, "func"))
64 return DIFF_FUNCINFO;
65 return -1;
66 }
67
68 static int git_config_rename(const char *var, const char *value)
69 {
70 if (!value)
71 return DIFF_DETECT_RENAME;
72 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
73 return DIFF_DETECT_COPY;
74 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
75 }
76
77 /*
78 * These are to give UI layer defaults.
79 * The core-level commands such as git-diff-files should
80 * never be affected by the setting of diff.renames
81 * the user happens to have in the configuration file.
82 */
83 int git_diff_ui_config(const char *var, const char *value, void *cb)
84 {
85 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
86 diff_use_color_default = git_config_colorbool(var, value, -1);
87 return 0;
88 }
89 if (!strcmp(var, "diff.renames")) {
90 diff_detect_rename_default = git_config_rename(var, value);
91 return 0;
92 }
93 if (!strcmp(var, "diff.autorefreshindex")) {
94 diff_auto_refresh_index = git_config_bool(var, value);
95 return 0;
96 }
97 if (!strcmp(var, "diff.mnemonicprefix")) {
98 diff_mnemonic_prefix = git_config_bool(var, value);
99 return 0;
100 }
101 if (!strcmp(var, "diff.noprefix")) {
102 diff_no_prefix = git_config_bool(var, value);
103 return 0;
104 }
105 if (!strcmp(var, "diff.external"))
106 return git_config_string(&external_diff_cmd_cfg, var, value);
107 if (!strcmp(var, "diff.wordregex"))
108 return git_config_string(&diff_word_regex_cfg, var, value);
109
110 return git_diff_basic_config(var, value, cb);
111 }
112
113 int git_diff_basic_config(const char *var, const char *value, void *cb)
114 {
115 if (!strcmp(var, "diff.renamelimit")) {
116 diff_rename_limit_default = git_config_int(var, value);
117 return 0;
118 }
119
120 switch (userdiff_config(var, value)) {
121 case 0: break;
122 case -1: return -1;
123 default: return 0;
124 }
125
126 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
127 int slot = parse_diff_color_slot(var, 11);
128 if (slot < 0)
129 return 0;
130 if (!value)
131 return config_error_nonbool(var);
132 color_parse(value, var, diff_colors[slot]);
133 return 0;
134 }
135
136 /* like GNU diff's --suppress-blank-empty option */
137 if (!strcmp(var, "diff.suppressblankempty") ||
138 /* for backwards compatibility */
139 !strcmp(var, "diff.suppress-blank-empty")) {
140 diff_suppress_blank_empty = git_config_bool(var, value);
141 return 0;
142 }
143
144 return git_color_default_config(var, value, cb);
145 }
146
147 static char *quote_two(const char *one, const char *two)
148 {
149 int need_one = quote_c_style(one, NULL, NULL, 1);
150 int need_two = quote_c_style(two, NULL, NULL, 1);
151 struct strbuf res = STRBUF_INIT;
152
153 if (need_one + need_two) {
154 strbuf_addch(&res, '"');
155 quote_c_style(one, &res, NULL, 1);
156 quote_c_style(two, &res, NULL, 1);
157 strbuf_addch(&res, '"');
158 } else {
159 strbuf_addstr(&res, one);
160 strbuf_addstr(&res, two);
161 }
162 return strbuf_detach(&res, NULL);
163 }
164
165 static const char *external_diff(void)
166 {
167 static const char *external_diff_cmd = NULL;
168 static int done_preparing = 0;
169
170 if (done_preparing)
171 return external_diff_cmd;
172 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
173 if (!external_diff_cmd)
174 external_diff_cmd = external_diff_cmd_cfg;
175 done_preparing = 1;
176 return external_diff_cmd;
177 }
178
179 static struct diff_tempfile {
180 const char *name; /* filename external diff should read from */
181 char hex[41];
182 char mode[10];
183 char tmp_path[PATH_MAX];
184 } diff_temp[2];
185
186 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
187
188 struct emit_callback {
189 int color_diff;
190 unsigned ws_rule;
191 int blank_at_eof_in_preimage;
192 int blank_at_eof_in_postimage;
193 int lno_in_preimage;
194 int lno_in_postimage;
195 sane_truncate_fn truncate;
196 const char **label_path;
197 struct diff_words_data *diff_words;
198 struct diff_options *opt;
199 int *found_changesp;
200 struct strbuf *header;
201 };
202
203 static int count_lines(const char *data, int size)
204 {
205 int count, ch, completely_empty = 1, nl_just_seen = 0;
206 count = 0;
207 while (0 < size--) {
208 ch = *data++;
209 if (ch == '\n') {
210 count++;
211 nl_just_seen = 1;
212 completely_empty = 0;
213 }
214 else {
215 nl_just_seen = 0;
216 completely_empty = 0;
217 }
218 }
219 if (completely_empty)
220 return 0;
221 if (!nl_just_seen)
222 count++; /* no trailing newline */
223 return count;
224 }
225
226 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
227 {
228 if (!DIFF_FILE_VALID(one)) {
229 mf->ptr = (char *)""; /* does not matter */
230 mf->size = 0;
231 return 0;
232 }
233 else if (diff_populate_filespec(one, 0))
234 return -1;
235
236 mf->ptr = one->data;
237 mf->size = one->size;
238 return 0;
239 }
240
241 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
242 {
243 char *ptr = mf->ptr;
244 long size = mf->size;
245 int cnt = 0;
246
247 if (!size)
248 return cnt;
249 ptr += size - 1; /* pointing at the very end */
250 if (*ptr != '\n')
251 ; /* incomplete line */
252 else
253 ptr--; /* skip the last LF */
254 while (mf->ptr < ptr) {
255 char *prev_eol;
256 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
257 if (*prev_eol == '\n')
258 break;
259 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
260 break;
261 cnt++;
262 ptr = prev_eol - 1;
263 }
264 return cnt;
265 }
266
267 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
268 struct emit_callback *ecbdata)
269 {
270 int l1, l2, at;
271 unsigned ws_rule = ecbdata->ws_rule;
272 l1 = count_trailing_blank(mf1, ws_rule);
273 l2 = count_trailing_blank(mf2, ws_rule);
274 if (l2 <= l1) {
275 ecbdata->blank_at_eof_in_preimage = 0;
276 ecbdata->blank_at_eof_in_postimage = 0;
277 return;
278 }
279 at = count_lines(mf1->ptr, mf1->size);
280 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
281
282 at = count_lines(mf2->ptr, mf2->size);
283 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
284 }
285
286 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
287 int first, const char *line, int len)
288 {
289 int has_trailing_newline, has_trailing_carriage_return;
290 int nofirst;
291 FILE *file = o->file;
292
293 if (o->output_prefix) {
294 struct strbuf *msg = NULL;
295 msg = o->output_prefix(o, o->output_prefix_data);
296 assert(msg);
297 fwrite(msg->buf, msg->len, 1, file);
298 }
299
300 if (len == 0) {
301 has_trailing_newline = (first == '\n');
302 has_trailing_carriage_return = (!has_trailing_newline &&
303 (first == '\r'));
304 nofirst = has_trailing_newline || has_trailing_carriage_return;
305 } else {
306 has_trailing_newline = (len > 0 && line[len-1] == '\n');
307 if (has_trailing_newline)
308 len--;
309 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
310 if (has_trailing_carriage_return)
311 len--;
312 nofirst = 0;
313 }
314
315 if (len || !nofirst) {
316 fputs(set, file);
317 if (!nofirst)
318 fputc(first, file);
319 fwrite(line, len, 1, file);
320 fputs(reset, file);
321 }
322 if (has_trailing_carriage_return)
323 fputc('\r', file);
324 if (has_trailing_newline)
325 fputc('\n', file);
326 }
327
328 static void emit_line(struct diff_options *o, const char *set, const char *reset,
329 const char *line, int len)
330 {
331 emit_line_0(o, set, reset, line[0], line+1, len-1);
332 }
333
334 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
335 {
336 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
337 ecbdata->blank_at_eof_in_preimage &&
338 ecbdata->blank_at_eof_in_postimage &&
339 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
340 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
341 return 0;
342 return ws_blank_line(line, len, ecbdata->ws_rule);
343 }
344
345 static void emit_add_line(const char *reset,
346 struct emit_callback *ecbdata,
347 const char *line, int len)
348 {
349 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
350 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
351
352 if (!*ws)
353 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
354 else if (new_blank_line_at_eof(ecbdata, line, len))
355 /* Blank line at EOF - paint '+' as well */
356 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
357 else {
358 /* Emit just the prefix, then the rest. */
359 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
360 ws_check_emit(line, len, ecbdata->ws_rule,
361 ecbdata->opt->file, set, reset, ws);
362 }
363 }
364
365 static void emit_hunk_header(struct emit_callback *ecbdata,
366 const char *line, int len)
367 {
368 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
369 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
370 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
371 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
372 static const char atat[2] = { '@', '@' };
373 const char *cp, *ep;
374 struct strbuf msgbuf = STRBUF_INIT;
375 int org_len = len;
376 int i = 1;
377
378 /*
379 * As a hunk header must begin with "@@ -<old>, +<new> @@",
380 * it always is at least 10 bytes long.
381 */
382 if (len < 10 ||
383 memcmp(line, atat, 2) ||
384 !(ep = memmem(line + 2, len - 2, atat, 2))) {
385 emit_line(ecbdata->opt, plain, reset, line, len);
386 return;
387 }
388 ep += 2; /* skip over @@ */
389
390 /* The hunk header in fraginfo color */
391 strbuf_add(&msgbuf, frag, strlen(frag));
392 strbuf_add(&msgbuf, line, ep - line);
393 strbuf_add(&msgbuf, reset, strlen(reset));
394
395 /*
396 * trailing "\r\n"
397 */
398 for ( ; i < 3; i++)
399 if (line[len - i] == '\r' || line[len - i] == '\n')
400 len--;
401
402 /* blank before the func header */
403 for (cp = ep; ep - line < len; ep++)
404 if (*ep != ' ' && *ep != '\t')
405 break;
406 if (ep != cp) {
407 strbuf_add(&msgbuf, plain, strlen(plain));
408 strbuf_add(&msgbuf, cp, ep - cp);
409 strbuf_add(&msgbuf, reset, strlen(reset));
410 }
411
412 if (ep < line + len) {
413 strbuf_add(&msgbuf, func, strlen(func));
414 strbuf_add(&msgbuf, ep, line + len - ep);
415 strbuf_add(&msgbuf, reset, strlen(reset));
416 }
417
418 strbuf_add(&msgbuf, line + len, org_len - len);
419 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
420 strbuf_release(&msgbuf);
421 }
422
423 static struct diff_tempfile *claim_diff_tempfile(void) {
424 int i;
425 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
426 if (!diff_temp[i].name)
427 return diff_temp + i;
428 die("BUG: diff is failing to clean up its tempfiles");
429 }
430
431 static int remove_tempfile_installed;
432
433 static void remove_tempfile(void)
434 {
435 int i;
436 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
437 if (diff_temp[i].name == diff_temp[i].tmp_path)
438 unlink_or_warn(diff_temp[i].name);
439 diff_temp[i].name = NULL;
440 }
441 }
442
443 static void remove_tempfile_on_signal(int signo)
444 {
445 remove_tempfile();
446 sigchain_pop(signo);
447 raise(signo);
448 }
449
450 static void print_line_count(FILE *file, int count)
451 {
452 switch (count) {
453 case 0:
454 fprintf(file, "0,0");
455 break;
456 case 1:
457 fprintf(file, "1");
458 break;
459 default:
460 fprintf(file, "1,%d", count);
461 break;
462 }
463 }
464
465 static void emit_rewrite_lines(struct emit_callback *ecb,
466 int prefix, const char *data, int size)
467 {
468 const char *endp = NULL;
469 static const char *nneof = " No newline at end of file\n";
470 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
471 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
472
473 while (0 < size) {
474 int len;
475
476 endp = memchr(data, '\n', size);
477 len = endp ? (endp - data + 1) : size;
478 if (prefix != '+') {
479 ecb->lno_in_preimage++;
480 emit_line_0(ecb->opt, old, reset, '-',
481 data, len);
482 } else {
483 ecb->lno_in_postimage++;
484 emit_add_line(reset, ecb, data, len);
485 }
486 size -= len;
487 data += len;
488 }
489 if (!endp) {
490 const char *plain = diff_get_color(ecb->color_diff,
491 DIFF_PLAIN);
492 emit_line_0(ecb->opt, plain, reset, '\\',
493 nneof, strlen(nneof));
494 }
495 }
496
497 static void emit_rewrite_diff(const char *name_a,
498 const char *name_b,
499 struct diff_filespec *one,
500 struct diff_filespec *two,
501 struct userdiff_driver *textconv_one,
502 struct userdiff_driver *textconv_two,
503 struct diff_options *o)
504 {
505 int lc_a, lc_b;
506 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
507 const char *name_a_tab, *name_b_tab;
508 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
509 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
510 const char *reset = diff_get_color(color_diff, DIFF_RESET);
511 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
512 const char *a_prefix, *b_prefix;
513 char *data_one, *data_two;
514 size_t size_one, size_two;
515 struct emit_callback ecbdata;
516 char *line_prefix = "";
517 struct strbuf *msgbuf;
518
519 if (o && o->output_prefix) {
520 msgbuf = o->output_prefix(o, o->output_prefix_data);
521 line_prefix = msgbuf->buf;
522 }
523
524 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
525 a_prefix = o->b_prefix;
526 b_prefix = o->a_prefix;
527 } else {
528 a_prefix = o->a_prefix;
529 b_prefix = o->b_prefix;
530 }
531
532 name_a += (*name_a == '/');
533 name_b += (*name_b == '/');
534 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
535 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
536
537 strbuf_reset(&a_name);
538 strbuf_reset(&b_name);
539 quote_two_c_style(&a_name, a_prefix, name_a, 0);
540 quote_two_c_style(&b_name, b_prefix, name_b, 0);
541
542 size_one = fill_textconv(textconv_one, one, &data_one);
543 size_two = fill_textconv(textconv_two, two, &data_two);
544
545 memset(&ecbdata, 0, sizeof(ecbdata));
546 ecbdata.color_diff = color_diff;
547 ecbdata.found_changesp = &o->found_changes;
548 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
549 ecbdata.opt = o;
550 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
551 mmfile_t mf1, mf2;
552 mf1.ptr = (char *)data_one;
553 mf2.ptr = (char *)data_two;
554 mf1.size = size_one;
555 mf2.size = size_two;
556 check_blank_at_eof(&mf1, &mf2, &ecbdata);
557 }
558 ecbdata.lno_in_preimage = 1;
559 ecbdata.lno_in_postimage = 1;
560
561 lc_a = count_lines(data_one, size_one);
562 lc_b = count_lines(data_two, size_two);
563 fprintf(o->file,
564 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
565 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
566 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
567 line_prefix, fraginfo);
568 print_line_count(o->file, lc_a);
569 fprintf(o->file, " +");
570 print_line_count(o->file, lc_b);
571 fprintf(o->file, " @@%s\n", reset);
572 if (lc_a)
573 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
574 if (lc_b)
575 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
576 if (textconv_one)
577 free((char *)data_one);
578 if (textconv_two)
579 free((char *)data_two);
580 }
581
582 struct diff_words_buffer {
583 mmfile_t text;
584 long alloc;
585 struct diff_words_orig {
586 const char *begin, *end;
587 } *orig;
588 int orig_nr, orig_alloc;
589 };
590
591 static void diff_words_append(char *line, unsigned long len,
592 struct diff_words_buffer *buffer)
593 {
594 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
595 line++;
596 len--;
597 memcpy(buffer->text.ptr + buffer->text.size, line, len);
598 buffer->text.size += len;
599 buffer->text.ptr[buffer->text.size] = '\0';
600 }
601
602 struct diff_words_style_elem
603 {
604 const char *prefix;
605 const char *suffix;
606 const char *color; /* NULL; filled in by the setup code if
607 * color is enabled */
608 };
609
610 struct diff_words_style
611 {
612 enum diff_words_type type;
613 struct diff_words_style_elem new, old, ctx;
614 const char *newline;
615 };
616
617 struct diff_words_style diff_words_styles[] = {
618 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
619 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
620 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
621 };
622
623 struct diff_words_data {
624 struct diff_words_buffer minus, plus;
625 const char *current_plus;
626 int last_minus;
627 struct diff_options *opt;
628 regex_t *word_regex;
629 enum diff_words_type type;
630 struct diff_words_style *style;
631 };
632
633 static int fn_out_diff_words_write_helper(FILE *fp,
634 struct diff_words_style_elem *st_el,
635 const char *newline,
636 size_t count, const char *buf,
637 const char *line_prefix)
638 {
639 int print = 0;
640
641 while (count) {
642 char *p = memchr(buf, '\n', count);
643 if (print)
644 fputs(line_prefix, fp);
645 if (p != buf) {
646 if (st_el->color && fputs(st_el->color, fp) < 0)
647 return -1;
648 if (fputs(st_el->prefix, fp) < 0 ||
649 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
650 fputs(st_el->suffix, fp) < 0)
651 return -1;
652 if (st_el->color && *st_el->color
653 && fputs(GIT_COLOR_RESET, fp) < 0)
654 return -1;
655 }
656 if (!p)
657 return 0;
658 if (fputs(newline, fp) < 0)
659 return -1;
660 count -= p + 1 - buf;
661 buf = p + 1;
662 print = 1;
663 }
664 return 0;
665 }
666
667 /*
668 * '--color-words' algorithm can be described as:
669 *
670 * 1. collect a the minus/plus lines of a diff hunk, divided into
671 * minus-lines and plus-lines;
672 *
673 * 2. break both minus-lines and plus-lines into words and
674 * place them into two mmfile_t with one word for each line;
675 *
676 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
677 *
678 * And for the common parts of the both file, we output the plus side text.
679 * diff_words->current_plus is used to trace the current position of the plus file
680 * which printed. diff_words->last_minus is used to trace the last minus word
681 * printed.
682 *
683 * For '--graph' to work with '--color-words', we need to output the graph prefix
684 * on each line of color words output. Generally, there are two conditions on
685 * which we should output the prefix.
686 *
687 * 1. diff_words->last_minus == 0 &&
688 * diff_words->current_plus == diff_words->plus.text.ptr
689 *
690 * that is: the plus text must start as a new line, and if there is no minus
691 * word printed, a graph prefix must be printed.
692 *
693 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
694 * *(diff_words->current_plus - 1) == '\n'
695 *
696 * that is: a graph prefix must be printed following a '\n'
697 */
698 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
699 {
700 if ((diff_words->last_minus == 0 &&
701 diff_words->current_plus == diff_words->plus.text.ptr) ||
702 (diff_words->current_plus > diff_words->plus.text.ptr &&
703 *(diff_words->current_plus - 1) == '\n')) {
704 return 1;
705 } else {
706 return 0;
707 }
708 }
709
710 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
711 {
712 struct diff_words_data *diff_words = priv;
713 struct diff_words_style *style = diff_words->style;
714 int minus_first, minus_len, plus_first, plus_len;
715 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
716 struct diff_options *opt = diff_words->opt;
717 struct strbuf *msgbuf;
718 char *line_prefix = "";
719
720 if (line[0] != '@' || parse_hunk_header(line, len,
721 &minus_first, &minus_len, &plus_first, &plus_len))
722 return;
723
724 assert(opt);
725 if (opt->output_prefix) {
726 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
727 line_prefix = msgbuf->buf;
728 }
729
730 /* POSIX requires that first be decremented by one if len == 0... */
731 if (minus_len) {
732 minus_begin = diff_words->minus.orig[minus_first].begin;
733 minus_end =
734 diff_words->minus.orig[minus_first + minus_len - 1].end;
735 } else
736 minus_begin = minus_end =
737 diff_words->minus.orig[minus_first].end;
738
739 if (plus_len) {
740 plus_begin = diff_words->plus.orig[plus_first].begin;
741 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
742 } else
743 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
744
745 if (color_words_output_graph_prefix(diff_words)) {
746 fputs(line_prefix, diff_words->opt->file);
747 }
748 if (diff_words->current_plus != plus_begin) {
749 fn_out_diff_words_write_helper(diff_words->opt->file,
750 &style->ctx, style->newline,
751 plus_begin - diff_words->current_plus,
752 diff_words->current_plus, line_prefix);
753 if (*(plus_begin - 1) == '\n')
754 fputs(line_prefix, diff_words->opt->file);
755 }
756 if (minus_begin != minus_end) {
757 fn_out_diff_words_write_helper(diff_words->opt->file,
758 &style->old, style->newline,
759 minus_end - minus_begin, minus_begin,
760 line_prefix);
761 }
762 if (plus_begin != plus_end) {
763 fn_out_diff_words_write_helper(diff_words->opt->file,
764 &style->new, style->newline,
765 plus_end - plus_begin, plus_begin,
766 line_prefix);
767 }
768
769 diff_words->current_plus = plus_end;
770 diff_words->last_minus = minus_first;
771 }
772
773 /* This function starts looking at *begin, and returns 0 iff a word was found. */
774 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
775 int *begin, int *end)
776 {
777 if (word_regex && *begin < buffer->size) {
778 regmatch_t match[1];
779 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
780 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
781 '\n', match[0].rm_eo - match[0].rm_so);
782 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
783 *begin += match[0].rm_so;
784 return *begin >= *end;
785 }
786 return -1;
787 }
788
789 /* find the next word */
790 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
791 (*begin)++;
792 if (*begin >= buffer->size)
793 return -1;
794
795 /* find the end of the word */
796 *end = *begin + 1;
797 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
798 (*end)++;
799
800 return 0;
801 }
802
803 /*
804 * This function splits the words in buffer->text, stores the list with
805 * newline separator into out, and saves the offsets of the original words
806 * in buffer->orig.
807 */
808 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
809 regex_t *word_regex)
810 {
811 int i, j;
812 long alloc = 0;
813
814 out->size = 0;
815 out->ptr = NULL;
816
817 /* fake an empty "0th" word */
818 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
819 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
820 buffer->orig_nr = 1;
821
822 for (i = 0; i < buffer->text.size; i++) {
823 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
824 return;
825
826 /* store original boundaries */
827 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
828 buffer->orig_alloc);
829 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
830 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
831 buffer->orig_nr++;
832
833 /* store one word */
834 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
835 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
836 out->ptr[out->size + j - i] = '\n';
837 out->size += j - i + 1;
838
839 i = j - 1;
840 }
841 }
842
843 /* this executes the word diff on the accumulated buffers */
844 static void diff_words_show(struct diff_words_data *diff_words)
845 {
846 xpparam_t xpp;
847 xdemitconf_t xecfg;
848 mmfile_t minus, plus;
849 struct diff_words_style *style = diff_words->style;
850
851 struct diff_options *opt = diff_words->opt;
852 struct strbuf *msgbuf;
853 char *line_prefix = "";
854
855 assert(opt);
856 if (opt->output_prefix) {
857 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
858 line_prefix = msgbuf->buf;
859 }
860
861 /* special case: only removal */
862 if (!diff_words->plus.text.size) {
863 fputs(line_prefix, diff_words->opt->file);
864 fn_out_diff_words_write_helper(diff_words->opt->file,
865 &style->old, style->newline,
866 diff_words->minus.text.size,
867 diff_words->minus.text.ptr, line_prefix);
868 diff_words->minus.text.size = 0;
869 return;
870 }
871
872 diff_words->current_plus = diff_words->plus.text.ptr;
873 diff_words->last_minus = 0;
874
875 memset(&xpp, 0, sizeof(xpp));
876 memset(&xecfg, 0, sizeof(xecfg));
877 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
878 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
879 xpp.flags = 0;
880 /* as only the hunk header will be parsed, we need a 0-context */
881 xecfg.ctxlen = 0;
882 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
883 &xpp, &xecfg);
884 free(minus.ptr);
885 free(plus.ptr);
886 if (diff_words->current_plus != diff_words->plus.text.ptr +
887 diff_words->plus.text.size) {
888 if (color_words_output_graph_prefix(diff_words))
889 fputs(line_prefix, diff_words->opt->file);
890 fn_out_diff_words_write_helper(diff_words->opt->file,
891 &style->ctx, style->newline,
892 diff_words->plus.text.ptr + diff_words->plus.text.size
893 - diff_words->current_plus, diff_words->current_plus,
894 line_prefix);
895 }
896 diff_words->minus.text.size = diff_words->plus.text.size = 0;
897 }
898
899 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
900 static void diff_words_flush(struct emit_callback *ecbdata)
901 {
902 if (ecbdata->diff_words->minus.text.size ||
903 ecbdata->diff_words->plus.text.size)
904 diff_words_show(ecbdata->diff_words);
905 }
906
907 static void free_diff_words_data(struct emit_callback *ecbdata)
908 {
909 if (ecbdata->diff_words) {
910 diff_words_flush(ecbdata);
911 free (ecbdata->diff_words->minus.text.ptr);
912 free (ecbdata->diff_words->minus.orig);
913 free (ecbdata->diff_words->plus.text.ptr);
914 free (ecbdata->diff_words->plus.orig);
915 free(ecbdata->diff_words->word_regex);
916 free(ecbdata->diff_words);
917 ecbdata->diff_words = NULL;
918 }
919 }
920
921 const char *diff_get_color(int diff_use_color, enum color_diff ix)
922 {
923 if (diff_use_color)
924 return diff_colors[ix];
925 return "";
926 }
927
928 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
929 {
930 const char *cp;
931 unsigned long allot;
932 size_t l = len;
933
934 if (ecb->truncate)
935 return ecb->truncate(line, len);
936 cp = line;
937 allot = l;
938 while (0 < l) {
939 (void) utf8_width(&cp, &l);
940 if (!cp)
941 break; /* truncated in the middle? */
942 }
943 return allot - l;
944 }
945
946 static void find_lno(const char *line, struct emit_callback *ecbdata)
947 {
948 const char *p;
949 ecbdata->lno_in_preimage = 0;
950 ecbdata->lno_in_postimage = 0;
951 p = strchr(line, '-');
952 if (!p)
953 return; /* cannot happen */
954 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
955 p = strchr(p, '+');
956 if (!p)
957 return; /* cannot happen */
958 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
959 }
960
961 static void fn_out_consume(void *priv, char *line, unsigned long len)
962 {
963 struct emit_callback *ecbdata = priv;
964 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
965 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
966 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
967 struct diff_options *o = ecbdata->opt;
968 char *line_prefix = "";
969 struct strbuf *msgbuf;
970
971 if (o && o->output_prefix) {
972 msgbuf = o->output_prefix(o, o->output_prefix_data);
973 line_prefix = msgbuf->buf;
974 }
975
976 if (ecbdata->header) {
977 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
978 strbuf_reset(ecbdata->header);
979 ecbdata->header = NULL;
980 }
981 *(ecbdata->found_changesp) = 1;
982
983 if (ecbdata->label_path[0]) {
984 const char *name_a_tab, *name_b_tab;
985
986 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
987 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
988
989 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
990 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
991 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
992 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
993 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
994 }
995
996 if (diff_suppress_blank_empty
997 && len == 2 && line[0] == ' ' && line[1] == '\n') {
998 line[0] = '\n';
999 len = 1;
1000 }
1001
1002 if (line[0] == '@') {
1003 if (ecbdata->diff_words)
1004 diff_words_flush(ecbdata);
1005 len = sane_truncate_line(ecbdata, line, len);
1006 find_lno(line, ecbdata);
1007 emit_hunk_header(ecbdata, line, len);
1008 if (line[len-1] != '\n')
1009 putc('\n', ecbdata->opt->file);
1010 return;
1011 }
1012
1013 if (len < 1) {
1014 emit_line(ecbdata->opt, reset, reset, line, len);
1015 if (ecbdata->diff_words
1016 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1017 fputs("~\n", ecbdata->opt->file);
1018 return;
1019 }
1020
1021 if (ecbdata->diff_words) {
1022 if (line[0] == '-') {
1023 diff_words_append(line, len,
1024 &ecbdata->diff_words->minus);
1025 return;
1026 } else if (line[0] == '+') {
1027 diff_words_append(line, len,
1028 &ecbdata->diff_words->plus);
1029 return;
1030 }
1031 diff_words_flush(ecbdata);
1032 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1033 emit_line(ecbdata->opt, plain, reset, line, len);
1034 fputs("~\n", ecbdata->opt->file);
1035 } else {
1036 /* don't print the prefix character */
1037 emit_line(ecbdata->opt, plain, reset, line+1, len-1);
1038 }
1039 return;
1040 }
1041
1042 if (line[0] != '+') {
1043 const char *color =
1044 diff_get_color(ecbdata->color_diff,
1045 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1046 ecbdata->lno_in_preimage++;
1047 if (line[0] == ' ')
1048 ecbdata->lno_in_postimage++;
1049 emit_line(ecbdata->opt, color, reset, line, len);
1050 } else {
1051 ecbdata->lno_in_postimage++;
1052 emit_add_line(reset, ecbdata, line + 1, len - 1);
1053 }
1054 }
1055
1056 static char *pprint_rename(const char *a, const char *b)
1057 {
1058 const char *old = a;
1059 const char *new = b;
1060 struct strbuf name = STRBUF_INIT;
1061 int pfx_length, sfx_length;
1062 int len_a = strlen(a);
1063 int len_b = strlen(b);
1064 int a_midlen, b_midlen;
1065 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1066 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1067
1068 if (qlen_a || qlen_b) {
1069 quote_c_style(a, &name, NULL, 0);
1070 strbuf_addstr(&name, " => ");
1071 quote_c_style(b, &name, NULL, 0);
1072 return strbuf_detach(&name, NULL);
1073 }
1074
1075 /* Find common prefix */
1076 pfx_length = 0;
1077 while (*old && *new && *old == *new) {
1078 if (*old == '/')
1079 pfx_length = old - a + 1;
1080 old++;
1081 new++;
1082 }
1083
1084 /* Find common suffix */
1085 old = a + len_a;
1086 new = b + len_b;
1087 sfx_length = 0;
1088 while (a <= old && b <= new && *old == *new) {
1089 if (*old == '/')
1090 sfx_length = len_a - (old - a);
1091 old--;
1092 new--;
1093 }
1094
1095 /*
1096 * pfx{mid-a => mid-b}sfx
1097 * {pfx-a => pfx-b}sfx
1098 * pfx{sfx-a => sfx-b}
1099 * name-a => name-b
1100 */
1101 a_midlen = len_a - pfx_length - sfx_length;
1102 b_midlen = len_b - pfx_length - sfx_length;
1103 if (a_midlen < 0)
1104 a_midlen = 0;
1105 if (b_midlen < 0)
1106 b_midlen = 0;
1107
1108 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1109 if (pfx_length + sfx_length) {
1110 strbuf_add(&name, a, pfx_length);
1111 strbuf_addch(&name, '{');
1112 }
1113 strbuf_add(&name, a + pfx_length, a_midlen);
1114 strbuf_addstr(&name, " => ");
1115 strbuf_add(&name, b + pfx_length, b_midlen);
1116 if (pfx_length + sfx_length) {
1117 strbuf_addch(&name, '}');
1118 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1119 }
1120 return strbuf_detach(&name, NULL);
1121 }
1122
1123 struct diffstat_t {
1124 int nr;
1125 int alloc;
1126 struct diffstat_file {
1127 char *from_name;
1128 char *name;
1129 char *print_name;
1130 unsigned is_unmerged:1;
1131 unsigned is_binary:1;
1132 unsigned is_renamed:1;
1133 uintmax_t added, deleted;
1134 } **files;
1135 };
1136
1137 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1138 const char *name_a,
1139 const char *name_b)
1140 {
1141 struct diffstat_file *x;
1142 x = xcalloc(sizeof (*x), 1);
1143 if (diffstat->nr == diffstat->alloc) {
1144 diffstat->alloc = alloc_nr(diffstat->alloc);
1145 diffstat->files = xrealloc(diffstat->files,
1146 diffstat->alloc * sizeof(x));
1147 }
1148 diffstat->files[diffstat->nr++] = x;
1149 if (name_b) {
1150 x->from_name = xstrdup(name_a);
1151 x->name = xstrdup(name_b);
1152 x->is_renamed = 1;
1153 }
1154 else {
1155 x->from_name = NULL;
1156 x->name = xstrdup(name_a);
1157 }
1158 return x;
1159 }
1160
1161 static void diffstat_consume(void *priv, char *line, unsigned long len)
1162 {
1163 struct diffstat_t *diffstat = priv;
1164 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1165
1166 if (line[0] == '+')
1167 x->added++;
1168 else if (line[0] == '-')
1169 x->deleted++;
1170 }
1171
1172 const char mime_boundary_leader[] = "------------";
1173
1174 static int scale_linear(int it, int width, int max_change)
1175 {
1176 /*
1177 * make sure that at least one '-' is printed if there were deletions,
1178 * and likewise for '+'.
1179 */
1180 if (max_change < 2)
1181 return it;
1182 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
1183 }
1184
1185 static void show_name(FILE *file,
1186 const char *prefix, const char *name, int len)
1187 {
1188 fprintf(file, " %s%-*s |", prefix, len, name);
1189 }
1190
1191 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1192 {
1193 if (cnt <= 0)
1194 return;
1195 fprintf(file, "%s", set);
1196 while (cnt--)
1197 putc(ch, file);
1198 fprintf(file, "%s", reset);
1199 }
1200
1201 static void fill_print_name(struct diffstat_file *file)
1202 {
1203 char *pname;
1204
1205 if (file->print_name)
1206 return;
1207
1208 if (!file->is_renamed) {
1209 struct strbuf buf = STRBUF_INIT;
1210 if (quote_c_style(file->name, &buf, NULL, 0)) {
1211 pname = strbuf_detach(&buf, NULL);
1212 } else {
1213 pname = file->name;
1214 strbuf_release(&buf);
1215 }
1216 } else {
1217 pname = pprint_rename(file->from_name, file->name);
1218 }
1219 file->print_name = pname;
1220 }
1221
1222 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1223 {
1224 int i, len, add, del, adds = 0, dels = 0;
1225 uintmax_t max_change = 0, max_len = 0;
1226 int total_files = data->nr;
1227 int width, name_width;
1228 const char *reset, *set, *add_c, *del_c;
1229 const char *line_prefix = "";
1230 struct strbuf *msg = NULL;
1231
1232 if (data->nr == 0)
1233 return;
1234
1235 if (options->output_prefix) {
1236 msg = options->output_prefix(options, options->output_prefix_data);
1237 line_prefix = msg->buf;
1238 }
1239
1240 width = options->stat_width ? options->stat_width : 80;
1241 name_width = options->stat_name_width ? options->stat_name_width : 50;
1242
1243 /* Sanity: give at least 5 columns to the graph,
1244 * but leave at least 10 columns for the name.
1245 */
1246 if (width < 25)
1247 width = 25;
1248 if (name_width < 10)
1249 name_width = 10;
1250 else if (width < name_width + 15)
1251 name_width = width - 15;
1252
1253 /* Find the longest filename and max number of changes */
1254 reset = diff_get_color_opt(options, DIFF_RESET);
1255 set = diff_get_color_opt(options, DIFF_PLAIN);
1256 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1257 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1258
1259 for (i = 0; i < data->nr; i++) {
1260 struct diffstat_file *file = data->files[i];
1261 uintmax_t change = file->added + file->deleted;
1262 fill_print_name(file);
1263 len = strlen(file->print_name);
1264 if (max_len < len)
1265 max_len = len;
1266
1267 if (file->is_binary || file->is_unmerged)
1268 continue;
1269 if (max_change < change)
1270 max_change = change;
1271 }
1272
1273 /* Compute the width of the graph part;
1274 * 10 is for one blank at the beginning of the line plus
1275 * " | count " between the name and the graph.
1276 *
1277 * From here on, name_width is the width of the name area,
1278 * and width is the width of the graph area.
1279 */
1280 name_width = (name_width < max_len) ? name_width : max_len;
1281 if (width < (name_width + 10) + max_change)
1282 width = width - (name_width + 10);
1283 else
1284 width = max_change;
1285
1286 for (i = 0; i < data->nr; i++) {
1287 const char *prefix = "";
1288 char *name = data->files[i]->print_name;
1289 uintmax_t added = data->files[i]->added;
1290 uintmax_t deleted = data->files[i]->deleted;
1291 int name_len;
1292
1293 /*
1294 * "scale" the filename
1295 */
1296 len = name_width;
1297 name_len = strlen(name);
1298 if (name_width < name_len) {
1299 char *slash;
1300 prefix = "...";
1301 len -= 3;
1302 name += name_len - len;
1303 slash = strchr(name, '/');
1304 if (slash)
1305 name = slash;
1306 }
1307
1308 if (data->files[i]->is_binary) {
1309 fprintf(options->file, "%s", line_prefix);
1310 show_name(options->file, prefix, name, len);
1311 fprintf(options->file, " Bin ");
1312 fprintf(options->file, "%s%"PRIuMAX"%s",
1313 del_c, deleted, reset);
1314 fprintf(options->file, " -> ");
1315 fprintf(options->file, "%s%"PRIuMAX"%s",
1316 add_c, added, reset);
1317 fprintf(options->file, " bytes");
1318 fprintf(options->file, "\n");
1319 continue;
1320 }
1321 else if (data->files[i]->is_unmerged) {
1322 fprintf(options->file, "%s", line_prefix);
1323 show_name(options->file, prefix, name, len);
1324 fprintf(options->file, " Unmerged\n");
1325 continue;
1326 }
1327 else if (!data->files[i]->is_renamed &&
1328 (added + deleted == 0)) {
1329 total_files--;
1330 continue;
1331 }
1332
1333 /*
1334 * scale the add/delete
1335 */
1336 add = added;
1337 del = deleted;
1338 adds += add;
1339 dels += del;
1340
1341 if (width <= max_change) {
1342 add = scale_linear(add, width, max_change);
1343 del = scale_linear(del, width, max_change);
1344 }
1345 fprintf(options->file, "%s", line_prefix);
1346 show_name(options->file, prefix, name, len);
1347 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1348 added + deleted ? " " : "");
1349 show_graph(options->file, '+', add, add_c, reset);
1350 show_graph(options->file, '-', del, del_c, reset);
1351 fprintf(options->file, "\n");
1352 }
1353 fprintf(options->file, "%s", line_prefix);
1354 fprintf(options->file,
1355 " %d files changed, %d insertions(+), %d deletions(-)\n",
1356 total_files, adds, dels);
1357 }
1358
1359 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1360 {
1361 int i, adds = 0, dels = 0, total_files = data->nr;
1362
1363 if (data->nr == 0)
1364 return;
1365
1366 for (i = 0; i < data->nr; i++) {
1367 if (!data->files[i]->is_binary &&
1368 !data->files[i]->is_unmerged) {
1369 int added = data->files[i]->added;
1370 int deleted= data->files[i]->deleted;
1371 if (!data->files[i]->is_renamed &&
1372 (added + deleted == 0)) {
1373 total_files--;
1374 } else {
1375 adds += added;
1376 dels += deleted;
1377 }
1378 }
1379 }
1380 if (options->output_prefix) {
1381 struct strbuf *msg = NULL;
1382 msg = options->output_prefix(options,
1383 options->output_prefix_data);
1384 fprintf(options->file, "%s", msg->buf);
1385 }
1386 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1387 total_files, adds, dels);
1388 }
1389
1390 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1391 {
1392 int i;
1393
1394 if (data->nr == 0)
1395 return;
1396
1397 for (i = 0; i < data->nr; i++) {
1398 struct diffstat_file *file = data->files[i];
1399
1400 if (options->output_prefix) {
1401 struct strbuf *msg = NULL;
1402 msg = options->output_prefix(options,
1403 options->output_prefix_data);
1404 fprintf(options->file, "%s", msg->buf);
1405 }
1406
1407 if (file->is_binary)
1408 fprintf(options->file, "-\t-\t");
1409 else
1410 fprintf(options->file,
1411 "%"PRIuMAX"\t%"PRIuMAX"\t",
1412 file->added, file->deleted);
1413 if (options->line_termination) {
1414 fill_print_name(file);
1415 if (!file->is_renamed)
1416 write_name_quoted(file->name, options->file,
1417 options->line_termination);
1418 else {
1419 fputs(file->print_name, options->file);
1420 putc(options->line_termination, options->file);
1421 }
1422 } else {
1423 if (file->is_renamed) {
1424 putc('\0', options->file);
1425 write_name_quoted(file->from_name, options->file, '\0');
1426 }
1427 write_name_quoted(file->name, options->file, '\0');
1428 }
1429 }
1430 }
1431
1432 struct dirstat_file {
1433 const char *name;
1434 unsigned long changed;
1435 };
1436
1437 struct dirstat_dir {
1438 struct dirstat_file *files;
1439 int alloc, nr, percent, cumulative;
1440 };
1441
1442 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1443 unsigned long changed, const char *base, int baselen)
1444 {
1445 unsigned long this_dir = 0;
1446 unsigned int sources = 0;
1447 const char *line_prefix = "";
1448 struct strbuf *msg = NULL;
1449
1450 if (opt->output_prefix) {
1451 msg = opt->output_prefix(opt, opt->output_prefix_data);
1452 line_prefix = msg->buf;
1453 }
1454
1455 while (dir->nr) {
1456 struct dirstat_file *f = dir->files;
1457 int namelen = strlen(f->name);
1458 unsigned long this;
1459 char *slash;
1460
1461 if (namelen < baselen)
1462 break;
1463 if (memcmp(f->name, base, baselen))
1464 break;
1465 slash = strchr(f->name + baselen, '/');
1466 if (slash) {
1467 int newbaselen = slash + 1 - f->name;
1468 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1469 sources++;
1470 } else {
1471 this = f->changed;
1472 dir->files++;
1473 dir->nr--;
1474 sources += 2;
1475 }
1476 this_dir += this;
1477 }
1478
1479 /*
1480 * We don't report dirstat's for
1481 * - the top level
1482 * - or cases where everything came from a single directory
1483 * under this directory (sources == 1).
1484 */
1485 if (baselen && sources != 1) {
1486 int permille = this_dir * 1000 / changed;
1487 if (permille) {
1488 int percent = permille / 10;
1489 if (percent >= dir->percent) {
1490 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1491 percent, permille % 10, baselen, base);
1492 if (!dir->cumulative)
1493 return 0;
1494 }
1495 }
1496 }
1497 return this_dir;
1498 }
1499
1500 static int dirstat_compare(const void *_a, const void *_b)
1501 {
1502 const struct dirstat_file *a = _a;
1503 const struct dirstat_file *b = _b;
1504 return strcmp(a->name, b->name);
1505 }
1506
1507 static void show_dirstat(struct diff_options *options)
1508 {
1509 int i;
1510 unsigned long changed;
1511 struct dirstat_dir dir;
1512 struct diff_queue_struct *q = &diff_queued_diff;
1513
1514 dir.files = NULL;
1515 dir.alloc = 0;
1516 dir.nr = 0;
1517 dir.percent = options->dirstat_percent;
1518 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1519
1520 changed = 0;
1521 for (i = 0; i < q->nr; i++) {
1522 struct diff_filepair *p = q->queue[i];
1523 const char *name;
1524 unsigned long copied, added, damage;
1525
1526 name = p->one->path ? p->one->path : p->two->path;
1527
1528 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1529 diff_populate_filespec(p->one, 0);
1530 diff_populate_filespec(p->two, 0);
1531 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1532 &copied, &added);
1533 diff_free_filespec_data(p->one);
1534 diff_free_filespec_data(p->two);
1535 } else if (DIFF_FILE_VALID(p->one)) {
1536 diff_populate_filespec(p->one, 1);
1537 copied = added = 0;
1538 diff_free_filespec_data(p->one);
1539 } else if (DIFF_FILE_VALID(p->two)) {
1540 diff_populate_filespec(p->two, 1);
1541 copied = 0;
1542 added = p->two->size;
1543 diff_free_filespec_data(p->two);
1544 } else
1545 continue;
1546
1547 /*
1548 * Original minus copied is the removed material,
1549 * added is the new material. They are both damages
1550 * made to the preimage. In --dirstat-by-file mode, count
1551 * damaged files, not damaged lines. This is done by
1552 * counting only a single damaged line per file.
1553 */
1554 damage = (p->one->size - copied) + added;
1555 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1556 damage = 1;
1557
1558 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1559 dir.files[dir.nr].name = name;
1560 dir.files[dir.nr].changed = damage;
1561 changed += damage;
1562 dir.nr++;
1563 }
1564
1565 /* This can happen even with many files, if everything was renames */
1566 if (!changed)
1567 return;
1568
1569 /* Show all directories with more than x% of the changes */
1570 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1571 gather_dirstat(options, &dir, changed, "", 0);
1572 }
1573
1574 static void free_diffstat_info(struct diffstat_t *diffstat)
1575 {
1576 int i;
1577 for (i = 0; i < diffstat->nr; i++) {
1578 struct diffstat_file *f = diffstat->files[i];
1579 if (f->name != f->print_name)
1580 free(f->print_name);
1581 free(f->name);
1582 free(f->from_name);
1583 free(f);
1584 }
1585 free(diffstat->files);
1586 }
1587
1588 struct checkdiff_t {
1589 const char *filename;
1590 int lineno;
1591 int conflict_marker_size;
1592 struct diff_options *o;
1593 unsigned ws_rule;
1594 unsigned status;
1595 };
1596
1597 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1598 {
1599 char firstchar;
1600 int cnt;
1601
1602 if (len < marker_size + 1)
1603 return 0;
1604 firstchar = line[0];
1605 switch (firstchar) {
1606 case '=': case '>': case '<': case '|':
1607 break;
1608 default:
1609 return 0;
1610 }
1611 for (cnt = 1; cnt < marker_size; cnt++)
1612 if (line[cnt] != firstchar)
1613 return 0;
1614 /* line[1] thru line[marker_size-1] are same as firstchar */
1615 if (len < marker_size + 1 || !isspace(line[marker_size]))
1616 return 0;
1617 return 1;
1618 }
1619
1620 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1621 {
1622 struct checkdiff_t *data = priv;
1623 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1624 int marker_size = data->conflict_marker_size;
1625 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1626 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1627 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1628 char *err;
1629 char *line_prefix = "";
1630 struct strbuf *msgbuf;
1631
1632 assert(data->o);
1633 if (data->o->output_prefix) {
1634 msgbuf = data->o->output_prefix(data->o,
1635 data->o->output_prefix_data);
1636 line_prefix = msgbuf->buf;
1637 }
1638
1639 if (line[0] == '+') {
1640 unsigned bad;
1641 data->lineno++;
1642 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1643 data->status |= 1;
1644 fprintf(data->o->file,
1645 "%s%s:%d: leftover conflict marker\n",
1646 line_prefix, data->filename, data->lineno);
1647 }
1648 bad = ws_check(line + 1, len - 1, data->ws_rule);
1649 if (!bad)
1650 return;
1651 data->status |= bad;
1652 err = whitespace_error_string(bad);
1653 fprintf(data->o->file, "%s%s:%d: %s.\n",
1654 line_prefix, data->filename, data->lineno, err);
1655 free(err);
1656 emit_line(data->o, set, reset, line, 1);
1657 ws_check_emit(line + 1, len - 1, data->ws_rule,
1658 data->o->file, set, reset, ws);
1659 } else if (line[0] == ' ') {
1660 data->lineno++;
1661 } else if (line[0] == '@') {
1662 char *plus = strchr(line, '+');
1663 if (plus)
1664 data->lineno = strtol(plus, NULL, 10) - 1;
1665 else
1666 die("invalid diff");
1667 }
1668 }
1669
1670 static unsigned char *deflate_it(char *data,
1671 unsigned long size,
1672 unsigned long *result_size)
1673 {
1674 int bound;
1675 unsigned char *deflated;
1676 z_stream stream;
1677
1678 memset(&stream, 0, sizeof(stream));
1679 deflateInit(&stream, zlib_compression_level);
1680 bound = deflateBound(&stream, size);
1681 deflated = xmalloc(bound);
1682 stream.next_out = deflated;
1683 stream.avail_out = bound;
1684
1685 stream.next_in = (unsigned char *)data;
1686 stream.avail_in = size;
1687 while (deflate(&stream, Z_FINISH) == Z_OK)
1688 ; /* nothing */
1689 deflateEnd(&stream);
1690 *result_size = stream.total_out;
1691 return deflated;
1692 }
1693
1694 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1695 {
1696 void *cp;
1697 void *delta;
1698 void *deflated;
1699 void *data;
1700 unsigned long orig_size;
1701 unsigned long delta_size;
1702 unsigned long deflate_size;
1703 unsigned long data_size;
1704
1705 /* We could do deflated delta, or we could do just deflated two,
1706 * whichever is smaller.
1707 */
1708 delta = NULL;
1709 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1710 if (one->size && two->size) {
1711 delta = diff_delta(one->ptr, one->size,
1712 two->ptr, two->size,
1713 &delta_size, deflate_size);
1714 if (delta) {
1715 void *to_free = delta;
1716 orig_size = delta_size;
1717 delta = deflate_it(delta, delta_size, &delta_size);
1718 free(to_free);
1719 }
1720 }
1721
1722 if (delta && delta_size < deflate_size) {
1723 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1724 free(deflated);
1725 data = delta;
1726 data_size = delta_size;
1727 }
1728 else {
1729 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1730 free(delta);
1731 data = deflated;
1732 data_size = deflate_size;
1733 }
1734
1735 /* emit data encoded in base85 */
1736 cp = data;
1737 while (data_size) {
1738 int bytes = (52 < data_size) ? 52 : data_size;
1739 char line[70];
1740 data_size -= bytes;
1741 if (bytes <= 26)
1742 line[0] = bytes + 'A' - 1;
1743 else
1744 line[0] = bytes - 26 + 'a' - 1;
1745 encode_85(line + 1, cp, bytes);
1746 cp = (char *) cp + bytes;
1747 fprintf(file, "%s", prefix);
1748 fputs(line, file);
1749 fputc('\n', file);
1750 }
1751 fprintf(file, "%s\n", prefix);
1752 free(data);
1753 }
1754
1755 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1756 {
1757 fprintf(file, "%sGIT binary patch\n", prefix);
1758 emit_binary_diff_body(file, one, two, prefix);
1759 emit_binary_diff_body(file, two, one, prefix);
1760 }
1761
1762 static void diff_filespec_load_driver(struct diff_filespec *one)
1763 {
1764 if (!one->driver)
1765 one->driver = userdiff_find_by_path(one->path);
1766 if (!one->driver)
1767 one->driver = userdiff_find_by_name("default");
1768 }
1769
1770 int diff_filespec_is_binary(struct diff_filespec *one)
1771 {
1772 if (one->is_binary == -1) {
1773 diff_filespec_load_driver(one);
1774 if (one->driver->binary != -1)
1775 one->is_binary = one->driver->binary;
1776 else {
1777 if (!one->data && DIFF_FILE_VALID(one))
1778 diff_populate_filespec(one, 0);
1779 if (one->data)
1780 one->is_binary = buffer_is_binary(one->data,
1781 one->size);
1782 if (one->is_binary == -1)
1783 one->is_binary = 0;
1784 }
1785 }
1786 return one->is_binary;
1787 }
1788
1789 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1790 {
1791 diff_filespec_load_driver(one);
1792 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1793 }
1794
1795 static const char *userdiff_word_regex(struct diff_filespec *one)
1796 {
1797 diff_filespec_load_driver(one);
1798 return one->driver->word_regex;
1799 }
1800
1801 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1802 {
1803 if (!options->a_prefix)
1804 options->a_prefix = a;
1805 if (!options->b_prefix)
1806 options->b_prefix = b;
1807 }
1808
1809 struct userdiff_driver *get_textconv(struct diff_filespec *one)
1810 {
1811 if (!DIFF_FILE_VALID(one))
1812 return NULL;
1813 if (!S_ISREG(one->mode))
1814 return NULL;
1815 diff_filespec_load_driver(one);
1816 if (!one->driver->textconv)
1817 return NULL;
1818
1819 if (one->driver->textconv_want_cache && !one->driver->textconv_cache) {
1820 struct notes_cache *c = xmalloc(sizeof(*c));
1821 struct strbuf name = STRBUF_INIT;
1822
1823 strbuf_addf(&name, "textconv/%s", one->driver->name);
1824 notes_cache_init(c, name.buf, one->driver->textconv);
1825 one->driver->textconv_cache = c;
1826 }
1827
1828 return one->driver;
1829 }
1830
1831 static void builtin_diff(const char *name_a,
1832 const char *name_b,
1833 struct diff_filespec *one,
1834 struct diff_filespec *two,
1835 const char *xfrm_msg,
1836 int must_show_header,
1837 struct diff_options *o,
1838 int complete_rewrite)
1839 {
1840 mmfile_t mf1, mf2;
1841 const char *lbl[2];
1842 char *a_one, *b_two;
1843 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1844 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1845 const char *a_prefix, *b_prefix;
1846 struct userdiff_driver *textconv_one = NULL;
1847 struct userdiff_driver *textconv_two = NULL;
1848 struct strbuf header = STRBUF_INIT;
1849 struct strbuf *msgbuf;
1850 char *line_prefix = "";
1851
1852 if (o->output_prefix) {
1853 msgbuf = o->output_prefix(o, o->output_prefix_data);
1854 line_prefix = msgbuf->buf;
1855 }
1856
1857 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
1858 (!one->mode || S_ISGITLINK(one->mode)) &&
1859 (!two->mode || S_ISGITLINK(two->mode))) {
1860 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
1861 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
1862 show_submodule_summary(o->file, one ? one->path : two->path,
1863 one->sha1, two->sha1, two->dirty_submodule,
1864 del, add, reset);
1865 return;
1866 }
1867
1868 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1869 textconv_one = get_textconv(one);
1870 textconv_two = get_textconv(two);
1871 }
1872
1873 diff_set_mnemonic_prefix(o, "a/", "b/");
1874 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1875 a_prefix = o->b_prefix;
1876 b_prefix = o->a_prefix;
1877 } else {
1878 a_prefix = o->a_prefix;
1879 b_prefix = o->b_prefix;
1880 }
1881
1882 /* Never use a non-valid filename anywhere if at all possible */
1883 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1884 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1885
1886 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1887 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1888 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1889 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1890 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
1891 if (lbl[0][0] == '/') {
1892 /* /dev/null */
1893 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
1894 if (xfrm_msg)
1895 strbuf_addstr(&header, xfrm_msg);
1896 must_show_header = 1;
1897 }
1898 else if (lbl[1][0] == '/') {
1899 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
1900 if (xfrm_msg)
1901 strbuf_addstr(&header, xfrm_msg);
1902 must_show_header = 1;
1903 }
1904 else {
1905 if (one->mode != two->mode) {
1906 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
1907 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
1908 must_show_header = 1;
1909 }
1910 if (xfrm_msg)
1911 strbuf_addstr(&header, xfrm_msg);
1912
1913 /*
1914 * we do not run diff between different kind
1915 * of objects.
1916 */
1917 if ((one->mode ^ two->mode) & S_IFMT)
1918 goto free_ab_and_return;
1919 if (complete_rewrite &&
1920 (textconv_one || !diff_filespec_is_binary(one)) &&
1921 (textconv_two || !diff_filespec_is_binary(two))) {
1922 fprintf(o->file, "%s", header.buf);
1923 strbuf_reset(&header);
1924 emit_rewrite_diff(name_a, name_b, one, two,
1925 textconv_one, textconv_two, o);
1926 o->found_changes = 1;
1927 goto free_ab_and_return;
1928 }
1929 }
1930
1931 if (!DIFF_OPT_TST(o, TEXT) &&
1932 ( (!textconv_one && diff_filespec_is_binary(one)) ||
1933 (!textconv_two && diff_filespec_is_binary(two)) )) {
1934 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1935 die("unable to read files to diff");
1936 /* Quite common confusing case */
1937 if (mf1.size == mf2.size &&
1938 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
1939 if (must_show_header)
1940 fprintf(o->file, "%s", header.buf);
1941 goto free_ab_and_return;
1942 }
1943 fprintf(o->file, "%s", header.buf);
1944 strbuf_reset(&header);
1945 if (DIFF_OPT_TST(o, BINARY))
1946 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
1947 else
1948 fprintf(o->file, "%sBinary files %s and %s differ\n",
1949 line_prefix, lbl[0], lbl[1]);
1950 o->found_changes = 1;
1951 }
1952 else {
1953 /* Crazy xdl interfaces.. */
1954 const char *diffopts = getenv("GIT_DIFF_OPTS");
1955 xpparam_t xpp;
1956 xdemitconf_t xecfg;
1957 struct emit_callback ecbdata;
1958 const struct userdiff_funcname *pe;
1959
1960 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
1961 fprintf(o->file, "%s", header.buf);
1962 strbuf_reset(&header);
1963 }
1964
1965 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
1966 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
1967
1968 pe = diff_funcname_pattern(one);
1969 if (!pe)
1970 pe = diff_funcname_pattern(two);
1971
1972 memset(&xpp, 0, sizeof(xpp));
1973 memset(&xecfg, 0, sizeof(xecfg));
1974 memset(&ecbdata, 0, sizeof(ecbdata));
1975 ecbdata.label_path = lbl;
1976 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1977 ecbdata.found_changesp = &o->found_changes;
1978 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1979 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
1980 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1981 ecbdata.opt = o;
1982 ecbdata.header = header.len ? &header : NULL;
1983 xpp.flags = o->xdl_opts;
1984 xecfg.ctxlen = o->context;
1985 xecfg.interhunkctxlen = o->interhunkcontext;
1986 xecfg.flags = XDL_EMIT_FUNCNAMES;
1987 if (pe)
1988 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1989 if (!diffopts)
1990 ;
1991 else if (!prefixcmp(diffopts, "--unified="))
1992 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1993 else if (!prefixcmp(diffopts, "-u"))
1994 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1995 if (o->word_diff) {
1996 int i;
1997
1998 ecbdata.diff_words =
1999 xcalloc(1, sizeof(struct diff_words_data));
2000 ecbdata.diff_words->type = o->word_diff;
2001 ecbdata.diff_words->opt = o;
2002 if (!o->word_regex)
2003 o->word_regex = userdiff_word_regex(one);
2004 if (!o->word_regex)
2005 o->word_regex = userdiff_word_regex(two);
2006 if (!o->word_regex)
2007 o->word_regex = diff_word_regex_cfg;
2008 if (o->word_regex) {
2009 ecbdata.diff_words->word_regex = (regex_t *)
2010 xmalloc(sizeof(regex_t));
2011 if (regcomp(ecbdata.diff_words->word_regex,
2012 o->word_regex,
2013 REG_EXTENDED | REG_NEWLINE))
2014 die ("Invalid regular expression: %s",
2015 o->word_regex);
2016 }
2017 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2018 if (o->word_diff == diff_words_styles[i].type) {
2019 ecbdata.diff_words->style =
2020 &diff_words_styles[i];
2021 break;
2022 }
2023 }
2024 if (DIFF_OPT_TST(o, COLOR_DIFF)) {
2025 struct diff_words_style *st = ecbdata.diff_words->style;
2026 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2027 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2028 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2029 }
2030 }
2031 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2032 &xpp, &xecfg);
2033 if (o->word_diff)
2034 free_diff_words_data(&ecbdata);
2035 if (textconv_one)
2036 free(mf1.ptr);
2037 if (textconv_two)
2038 free(mf2.ptr);
2039 xdiff_clear_find_func(&xecfg);
2040 }
2041
2042 free_ab_and_return:
2043 strbuf_release(&header);
2044 diff_free_filespec_data(one);
2045 diff_free_filespec_data(two);
2046 free(a_one);
2047 free(b_two);
2048 return;
2049 }
2050
2051 static void builtin_diffstat(const char *name_a, const char *name_b,
2052 struct diff_filespec *one,
2053 struct diff_filespec *two,
2054 struct diffstat_t *diffstat,
2055 struct diff_options *o,
2056 int complete_rewrite)
2057 {
2058 mmfile_t mf1, mf2;
2059 struct diffstat_file *data;
2060
2061 data = diffstat_add(diffstat, name_a, name_b);
2062
2063 if (!one || !two) {
2064 data->is_unmerged = 1;
2065 return;
2066 }
2067 if (complete_rewrite) {
2068 diff_populate_filespec(one, 0);
2069 diff_populate_filespec(two, 0);
2070 data->deleted = count_lines(one->data, one->size);
2071 data->added = count_lines(two->data, two->size);
2072 goto free_and_return;
2073 }
2074 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2075 die("unable to read files to diff");
2076
2077 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2078 data->is_binary = 1;
2079 data->added = mf2.size;
2080 data->deleted = mf1.size;
2081 } else {
2082 /* Crazy xdl interfaces.. */
2083 xpparam_t xpp;
2084 xdemitconf_t xecfg;
2085
2086 memset(&xpp, 0, sizeof(xpp));
2087 memset(&xecfg, 0, sizeof(xecfg));
2088 xpp.flags = o->xdl_opts;
2089 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2090 &xpp, &xecfg);
2091 }
2092
2093 free_and_return:
2094 diff_free_filespec_data(one);
2095 diff_free_filespec_data(two);
2096 }
2097
2098 static void builtin_checkdiff(const char *name_a, const char *name_b,
2099 const char *attr_path,
2100 struct diff_filespec *one,
2101 struct diff_filespec *two,
2102 struct diff_options *o)
2103 {
2104 mmfile_t mf1, mf2;
2105 struct checkdiff_t data;
2106
2107 if (!two)
2108 return;
2109
2110 memset(&data, 0, sizeof(data));
2111 data.filename = name_b ? name_b : name_a;
2112 data.lineno = 0;
2113 data.o = o;
2114 data.ws_rule = whitespace_rule(attr_path);
2115 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2116
2117 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2118 die("unable to read files to diff");
2119
2120 /*
2121 * All the other codepaths check both sides, but not checking
2122 * the "old" side here is deliberate. We are checking the newly
2123 * introduced changes, and as long as the "new" side is text, we
2124 * can and should check what it introduces.
2125 */
2126 if (diff_filespec_is_binary(two))
2127 goto free_and_return;
2128 else {
2129 /* Crazy xdl interfaces.. */
2130 xpparam_t xpp;
2131 xdemitconf_t xecfg;
2132
2133 memset(&xpp, 0, sizeof(xpp));
2134 memset(&xecfg, 0, sizeof(xecfg));
2135 xecfg.ctxlen = 1; /* at least one context line */
2136 xpp.flags = 0;
2137 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2138 &xpp, &xecfg);
2139
2140 if (data.ws_rule & WS_BLANK_AT_EOF) {
2141 struct emit_callback ecbdata;
2142 int blank_at_eof;
2143
2144 ecbdata.ws_rule = data.ws_rule;
2145 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2146 blank_at_eof = ecbdata.blank_at_eof_in_preimage;
2147
2148 if (blank_at_eof) {
2149 static char *err;
2150 if (!err)
2151 err = whitespace_error_string(WS_BLANK_AT_EOF);
2152 fprintf(o->file, "%s:%d: %s.\n",
2153 data.filename, blank_at_eof, err);
2154 data.status = 1; /* report errors */
2155 }
2156 }
2157 }
2158 free_and_return:
2159 diff_free_filespec_data(one);
2160 diff_free_filespec_data(two);
2161 if (data.status)
2162 DIFF_OPT_SET(o, CHECK_FAILED);
2163 }
2164
2165 struct diff_filespec *alloc_filespec(const char *path)
2166 {
2167 int namelen = strlen(path);
2168 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2169
2170 memset(spec, 0, sizeof(*spec));
2171 spec->path = (char *)(spec + 1);
2172 memcpy(spec->path, path, namelen+1);
2173 spec->count = 1;
2174 spec->is_binary = -1;
2175 return spec;
2176 }
2177
2178 void free_filespec(struct diff_filespec *spec)
2179 {
2180 if (!--spec->count) {
2181 diff_free_filespec_data(spec);
2182 free(spec);
2183 }
2184 }
2185
2186 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2187 unsigned short mode)
2188 {
2189 if (mode) {
2190 spec->mode = canon_mode(mode);
2191 hashcpy(spec->sha1, sha1);
2192 spec->sha1_valid = !is_null_sha1(sha1);
2193 }
2194 }
2195
2196 /*
2197 * Given a name and sha1 pair, if the index tells us the file in
2198 * the work tree has that object contents, return true, so that
2199 * prepare_temp_file() does not have to inflate and extract.
2200 */
2201 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2202 {
2203 struct cache_entry *ce;
2204 struct stat st;
2205 int pos, len;
2206
2207 /*
2208 * We do not read the cache ourselves here, because the
2209 * benchmark with my previous version that always reads cache
2210 * shows that it makes things worse for diff-tree comparing
2211 * two linux-2.6 kernel trees in an already checked out work
2212 * tree. This is because most diff-tree comparisons deal with
2213 * only a small number of files, while reading the cache is
2214 * expensive for a large project, and its cost outweighs the
2215 * savings we get by not inflating the object to a temporary
2216 * file. Practically, this code only helps when we are used
2217 * by diff-cache --cached, which does read the cache before
2218 * calling us.
2219 */
2220 if (!active_cache)
2221 return 0;
2222
2223 /* We want to avoid the working directory if our caller
2224 * doesn't need the data in a normal file, this system
2225 * is rather slow with its stat/open/mmap/close syscalls,
2226 * and the object is contained in a pack file. The pack
2227 * is probably already open and will be faster to obtain
2228 * the data through than the working directory. Loose
2229 * objects however would tend to be slower as they need
2230 * to be individually opened and inflated.
2231 */
2232 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2233 return 0;
2234
2235 len = strlen(name);
2236 pos = cache_name_pos(name, len);
2237 if (pos < 0)
2238 return 0;
2239 ce = active_cache[pos];
2240
2241 /*
2242 * This is not the sha1 we are looking for, or
2243 * unreusable because it is not a regular file.
2244 */
2245 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2246 return 0;
2247
2248 /*
2249 * If ce is marked as "assume unchanged", there is no
2250 * guarantee that work tree matches what we are looking for.
2251 */
2252 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2253 return 0;
2254
2255 /*
2256 * If ce matches the file in the work tree, we can reuse it.
2257 */
2258 if (ce_uptodate(ce) ||
2259 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2260 return 1;
2261
2262 return 0;
2263 }
2264
2265 static int populate_from_stdin(struct diff_filespec *s)
2266 {
2267 struct strbuf buf = STRBUF_INIT;
2268 size_t size = 0;
2269
2270 if (strbuf_read(&buf, 0, 0) < 0)
2271 return error("error while reading from stdin %s",
2272 strerror(errno));
2273
2274 s->should_munmap = 0;
2275 s->data = strbuf_detach(&buf, &size);
2276 s->size = size;
2277 s->should_free = 1;
2278 return 0;
2279 }
2280
2281 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2282 {
2283 int len;
2284 char *data = xmalloc(100), *dirty = "";
2285
2286 /* Are we looking at the work tree? */
2287 if (s->dirty_submodule)
2288 dirty = "-dirty";
2289
2290 len = snprintf(data, 100,
2291 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2292 s->data = data;
2293 s->size = len;
2294 s->should_free = 1;
2295 if (size_only) {
2296 s->data = NULL;
2297 free(data);
2298 }
2299 return 0;
2300 }
2301
2302 /*
2303 * While doing rename detection and pickaxe operation, we may need to
2304 * grab the data for the blob (or file) for our own in-core comparison.
2305 * diff_filespec has data and size fields for this purpose.
2306 */
2307 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2308 {
2309 int err = 0;
2310 if (!DIFF_FILE_VALID(s))
2311 die("internal error: asking to populate invalid file.");
2312 if (S_ISDIR(s->mode))
2313 return -1;
2314
2315 if (s->data)
2316 return 0;
2317
2318 if (size_only && 0 < s->size)
2319 return 0;
2320
2321 if (S_ISGITLINK(s->mode))
2322 return diff_populate_gitlink(s, size_only);
2323
2324 if (!s->sha1_valid ||
2325 reuse_worktree_file(s->path, s->sha1, 0)) {
2326 struct strbuf buf = STRBUF_INIT;
2327 struct stat st;
2328 int fd;
2329
2330 if (!strcmp(s->path, "-"))
2331 return populate_from_stdin(s);
2332
2333 if (lstat(s->path, &st) < 0) {
2334 if (errno == ENOENT) {
2335 err_empty:
2336 err = -1;
2337 empty:
2338 s->data = (char *)"";
2339 s->size = 0;
2340 return err;
2341 }
2342 }
2343 s->size = xsize_t(st.st_size);
2344 if (!s->size)
2345 goto empty;
2346 if (S_ISLNK(st.st_mode)) {
2347 struct strbuf sb = STRBUF_INIT;
2348
2349 if (strbuf_readlink(&sb, s->path, s->size))
2350 goto err_empty;
2351 s->size = sb.len;
2352 s->data = strbuf_detach(&sb, NULL);
2353 s->should_free = 1;
2354 return 0;
2355 }
2356 if (size_only)
2357 return 0;
2358 fd = open(s->path, O_RDONLY);
2359 if (fd < 0)
2360 goto err_empty;
2361 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2362 close(fd);
2363 s->should_munmap = 1;
2364
2365 /*
2366 * Convert from working tree format to canonical git format
2367 */
2368 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2369 size_t size = 0;
2370 munmap(s->data, s->size);
2371 s->should_munmap = 0;
2372 s->data = strbuf_detach(&buf, &size);
2373 s->size = size;
2374 s->should_free = 1;
2375 }
2376 }
2377 else {
2378 enum object_type type;
2379 if (size_only)
2380 type = sha1_object_info(s->sha1, &s->size);
2381 else {
2382 s->data = read_sha1_file(s->sha1, &type, &s->size);
2383 s->should_free = 1;
2384 }
2385 }
2386 return 0;
2387 }
2388
2389 void diff_free_filespec_blob(struct diff_filespec *s)
2390 {
2391 if (s->should_free)
2392 free(s->data);
2393 else if (s->should_munmap)
2394 munmap(s->data, s->size);
2395
2396 if (s->should_free || s->should_munmap) {
2397 s->should_free = s->should_munmap = 0;
2398 s->data = NULL;
2399 }
2400 }
2401
2402 void diff_free_filespec_data(struct diff_filespec *s)
2403 {
2404 diff_free_filespec_blob(s);
2405 free(s->cnt_data);
2406 s->cnt_data = NULL;
2407 }
2408
2409 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2410 void *blob,
2411 unsigned long size,
2412 const unsigned char *sha1,
2413 int mode)
2414 {
2415 int fd;
2416 struct strbuf buf = STRBUF_INIT;
2417 struct strbuf template = STRBUF_INIT;
2418 char *path_dup = xstrdup(path);
2419 const char *base = basename(path_dup);
2420
2421 /* Generate "XXXXXX_basename.ext" */
2422 strbuf_addstr(&template, "XXXXXX_");
2423 strbuf_addstr(&template, base);
2424
2425 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2426 strlen(base) + 1);
2427 if (fd < 0)
2428 die_errno("unable to create temp-file");
2429 if (convert_to_working_tree(path,
2430 (const char *)blob, (size_t)size, &buf)) {
2431 blob = buf.buf;
2432 size = buf.len;
2433 }
2434 if (write_in_full(fd, blob, size) != size)
2435 die_errno("unable to write temp-file");
2436 close(fd);
2437 temp->name = temp->tmp_path;
2438 strcpy(temp->hex, sha1_to_hex(sha1));
2439 temp->hex[40] = 0;
2440 sprintf(temp->mode, "%06o", mode);
2441 strbuf_release(&buf);
2442 strbuf_release(&template);
2443 free(path_dup);
2444 }
2445
2446 static struct diff_tempfile *prepare_temp_file(const char *name,
2447 struct diff_filespec *one)
2448 {
2449 struct diff_tempfile *temp = claim_diff_tempfile();
2450
2451 if (!DIFF_FILE_VALID(one)) {
2452 not_a_valid_file:
2453 /* A '-' entry produces this for file-2, and
2454 * a '+' entry produces this for file-1.
2455 */
2456 temp->name = "/dev/null";
2457 strcpy(temp->hex, ".");
2458 strcpy(temp->mode, ".");
2459 return temp;
2460 }
2461
2462 if (!remove_tempfile_installed) {
2463 atexit(remove_tempfile);
2464 sigchain_push_common(remove_tempfile_on_signal);
2465 remove_tempfile_installed = 1;
2466 }
2467
2468 if (!one->sha1_valid ||
2469 reuse_worktree_file(name, one->sha1, 1)) {
2470 struct stat st;
2471 if (lstat(name, &st) < 0) {
2472 if (errno == ENOENT)
2473 goto not_a_valid_file;
2474 die_errno("stat(%s)", name);
2475 }
2476 if (S_ISLNK(st.st_mode)) {
2477 struct strbuf sb = STRBUF_INIT;
2478 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2479 die_errno("readlink(%s)", name);
2480 prep_temp_blob(name, temp, sb.buf, sb.len,
2481 (one->sha1_valid ?
2482 one->sha1 : null_sha1),
2483 (one->sha1_valid ?
2484 one->mode : S_IFLNK));
2485 strbuf_release(&sb);
2486 }
2487 else {
2488 /* we can borrow from the file in the work tree */
2489 temp->name = name;
2490 if (!one->sha1_valid)
2491 strcpy(temp->hex, sha1_to_hex(null_sha1));
2492 else
2493 strcpy(temp->hex, sha1_to_hex(one->sha1));
2494 /* Even though we may sometimes borrow the
2495 * contents from the work tree, we always want
2496 * one->mode. mode is trustworthy even when
2497 * !(one->sha1_valid), as long as
2498 * DIFF_FILE_VALID(one).
2499 */
2500 sprintf(temp->mode, "%06o", one->mode);
2501 }
2502 return temp;
2503 }
2504 else {
2505 if (diff_populate_filespec(one, 0))
2506 die("cannot read data blob for %s", one->path);
2507 prep_temp_blob(name, temp, one->data, one->size,
2508 one->sha1, one->mode);
2509 }
2510 return temp;
2511 }
2512
2513 /* An external diff command takes:
2514 *
2515 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2516 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2517 *
2518 */
2519 static void run_external_diff(const char *pgm,
2520 const char *name,
2521 const char *other,
2522 struct diff_filespec *one,
2523 struct diff_filespec *two,
2524 const char *xfrm_msg,
2525 int complete_rewrite)
2526 {
2527 const char *spawn_arg[10];
2528 int retval;
2529 const char **arg = &spawn_arg[0];
2530
2531 if (one && two) {
2532 struct diff_tempfile *temp_one, *temp_two;
2533 const char *othername = (other ? other : name);
2534 temp_one = prepare_temp_file(name, one);
2535 temp_two = prepare_temp_file(othername, two);
2536 *arg++ = pgm;
2537 *arg++ = name;
2538 *arg++ = temp_one->name;
2539 *arg++ = temp_one->hex;
2540 *arg++ = temp_one->mode;
2541 *arg++ = temp_two->name;
2542 *arg++ = temp_two->hex;
2543 *arg++ = temp_two->mode;
2544 if (other) {
2545 *arg++ = other;
2546 *arg++ = xfrm_msg;
2547 }
2548 } else {
2549 *arg++ = pgm;
2550 *arg++ = name;
2551 }
2552 *arg = NULL;
2553 fflush(NULL);
2554 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2555 remove_tempfile();
2556 if (retval) {
2557 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2558 exit(1);
2559 }
2560 }
2561
2562 static int similarity_index(struct diff_filepair *p)
2563 {
2564 return p->score * 100 / MAX_SCORE;
2565 }
2566
2567 static void fill_metainfo(struct strbuf *msg,
2568 const char *name,
2569 const char *other,
2570 struct diff_filespec *one,
2571 struct diff_filespec *two,
2572 struct diff_options *o,
2573 struct diff_filepair *p,
2574 int *must_show_header,
2575 int use_color)
2576 {
2577 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2578 const char *reset = diff_get_color(use_color, DIFF_RESET);
2579 struct strbuf *msgbuf;
2580 char *line_prefix = "";
2581
2582 *must_show_header = 1;
2583 if (o->output_prefix) {
2584 msgbuf = o->output_prefix(o, o->output_prefix_data);
2585 line_prefix = msgbuf->buf;
2586 }
2587 strbuf_init(msg, PATH_MAX * 2 + 300);
2588 switch (p->status) {
2589 case DIFF_STATUS_COPIED:
2590 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2591 line_prefix, set, similarity_index(p));
2592 strbuf_addf(msg, "%s\n%s%scopy from ",
2593 reset, line_prefix, set);
2594 quote_c_style(name, msg, NULL, 0);
2595 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2596 quote_c_style(other, msg, NULL, 0);
2597 strbuf_addf(msg, "%s\n", reset);
2598 break;
2599 case DIFF_STATUS_RENAMED:
2600 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2601 line_prefix, set, similarity_index(p));
2602 strbuf_addf(msg, "%s\n%s%srename from ",
2603 reset, line_prefix, set);
2604 quote_c_style(name, msg, NULL, 0);
2605 strbuf_addf(msg, "%s\n%s%srename to ",
2606 reset, line_prefix, set);
2607 quote_c_style(other, msg, NULL, 0);
2608 strbuf_addf(msg, "%s\n", reset);
2609 break;
2610 case DIFF_STATUS_MODIFIED:
2611 if (p->score) {
2612 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2613 line_prefix,
2614 set, similarity_index(p), reset);
2615 break;
2616 }
2617 /* fallthru */
2618 default:
2619 *must_show_header = 0;
2620 }
2621 if (one && two && hashcmp(one->sha1, two->sha1)) {
2622 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2623
2624 if (DIFF_OPT_TST(o, BINARY)) {
2625 mmfile_t mf;
2626 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2627 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2628 abbrev = 40;
2629 }
2630 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2631 find_unique_abbrev(one->sha1, abbrev));
2632 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2633 if (one->mode == two->mode)
2634 strbuf_addf(msg, " %06o", one->mode);
2635 strbuf_addf(msg, "%s\n", reset);
2636 }
2637 }
2638
2639 static void run_diff_cmd(const char *pgm,
2640 const char *name,
2641 const char *other,
2642 const char *attr_path,
2643 struct diff_filespec *one,
2644 struct diff_filespec *two,
2645 struct strbuf *msg,
2646 struct diff_options *o,
2647 struct diff_filepair *p)
2648 {
2649 const char *xfrm_msg = NULL;
2650 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2651 int must_show_header = 0;
2652
2653 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2654 pgm = NULL;
2655 else {
2656 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2657 if (drv && drv->external)
2658 pgm = drv->external;
2659 }
2660
2661 if (msg) {
2662 /*
2663 * don't use colors when the header is intended for an
2664 * external diff driver
2665 */
2666 fill_metainfo(msg, name, other, one, two, o, p,
2667 &must_show_header,
2668 DIFF_OPT_TST(o, COLOR_DIFF) && !pgm);
2669 xfrm_msg = msg->len ? msg->buf : NULL;
2670 }
2671
2672 if (pgm) {
2673 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2674 complete_rewrite);
2675 return;
2676 }
2677 if (one && two)
2678 builtin_diff(name, other ? other : name,
2679 one, two, xfrm_msg, must_show_header,
2680 o, complete_rewrite);
2681 else
2682 fprintf(o->file, "* Unmerged path %s\n", name);
2683 }
2684
2685 static void diff_fill_sha1_info(struct diff_filespec *one)
2686 {
2687 if (DIFF_FILE_VALID(one)) {
2688 if (!one->sha1_valid) {
2689 struct stat st;
2690 if (!strcmp(one->path, "-")) {
2691 hashcpy(one->sha1, null_sha1);
2692 return;
2693 }
2694 if (lstat(one->path, &st) < 0)
2695 die_errno("stat '%s'", one->path);
2696 if (index_path(one->sha1, one->path, &st, 0))
2697 die("cannot hash %s", one->path);
2698 }
2699 }
2700 else
2701 hashclr(one->sha1);
2702 }
2703
2704 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2705 {
2706 /* Strip the prefix but do not molest /dev/null and absolute paths */
2707 if (*namep && **namep != '/')
2708 *namep += prefix_length;
2709 if (*otherp && **otherp != '/')
2710 *otherp += prefix_length;
2711 }
2712
2713 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2714 {
2715 const char *pgm = external_diff();
2716 struct strbuf msg;
2717 struct diff_filespec *one = p->one;
2718 struct diff_filespec *two = p->two;
2719 const char *name;
2720 const char *other;
2721 const char *attr_path;
2722
2723 name = p->one->path;
2724 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2725 attr_path = name;
2726 if (o->prefix_length)
2727 strip_prefix(o->prefix_length, &name, &other);
2728
2729 if (DIFF_PAIR_UNMERGED(p)) {
2730 run_diff_cmd(pgm, name, NULL, attr_path,
2731 NULL, NULL, NULL, o, p);
2732 return;
2733 }
2734
2735 diff_fill_sha1_info(one);
2736 diff_fill_sha1_info(two);
2737
2738 if (!pgm &&
2739 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2740 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2741 /*
2742 * a filepair that changes between file and symlink
2743 * needs to be split into deletion and creation.
2744 */
2745 struct diff_filespec *null = alloc_filespec(two->path);
2746 run_diff_cmd(NULL, name, other, attr_path,
2747 one, null, &msg, o, p);
2748 free(null);
2749 strbuf_release(&msg);
2750
2751 null = alloc_filespec(one->path);
2752 run_diff_cmd(NULL, name, other, attr_path,
2753 null, two, &msg, o, p);
2754 free(null);
2755 }
2756 else
2757 run_diff_cmd(pgm, name, other, attr_path,
2758 one, two, &msg, o, p);
2759
2760 strbuf_release(&msg);
2761 }
2762
2763 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2764 struct diffstat_t *diffstat)
2765 {
2766 const char *name;
2767 const char *other;
2768 int complete_rewrite = 0;
2769
2770 if (DIFF_PAIR_UNMERGED(p)) {
2771 /* unmerged */
2772 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2773 return;
2774 }
2775
2776 name = p->one->path;
2777 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2778
2779 if (o->prefix_length)
2780 strip_prefix(o->prefix_length, &name, &other);
2781
2782 diff_fill_sha1_info(p->one);
2783 diff_fill_sha1_info(p->two);
2784
2785 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2786 complete_rewrite = 1;
2787 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2788 }
2789
2790 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2791 {
2792 const char *name;
2793 const char *other;
2794 const char *attr_path;
2795
2796 if (DIFF_PAIR_UNMERGED(p)) {
2797 /* unmerged */
2798 return;
2799 }
2800
2801 name = p->one->path;
2802 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2803 attr_path = other ? other : name;
2804
2805 if (o->prefix_length)
2806 strip_prefix(o->prefix_length, &name, &other);
2807
2808 diff_fill_sha1_info(p->one);
2809 diff_fill_sha1_info(p->two);
2810
2811 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2812 }
2813
2814 void diff_setup(struct diff_options *options)
2815 {
2816 memset(options, 0, sizeof(*options));
2817 memset(&diff_queued_diff, 0, sizeof(diff_queued_diff));
2818
2819 options->file = stdout;
2820
2821 options->line_termination = '\n';
2822 options->break_opt = -1;
2823 options->rename_limit = -1;
2824 options->dirstat_percent = 3;
2825 options->context = 3;
2826
2827 options->change = diff_change;
2828 options->add_remove = diff_addremove;
2829 if (diff_use_color_default > 0)
2830 DIFF_OPT_SET(options, COLOR_DIFF);
2831 options->detect_rename = diff_detect_rename_default;
2832
2833 if (diff_no_prefix) {
2834 options->a_prefix = options->b_prefix = "";
2835 } else if (!diff_mnemonic_prefix) {
2836 options->a_prefix = "a/";
2837 options->b_prefix = "b/";
2838 }
2839 }
2840
2841 int diff_setup_done(struct diff_options *options)
2842 {
2843 int count = 0;
2844
2845 if (options->output_format & DIFF_FORMAT_NAME)
2846 count++;
2847 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2848 count++;
2849 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2850 count++;
2851 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2852 count++;
2853 if (count > 1)
2854 die("--name-only, --name-status, --check and -s are mutually exclusive");
2855
2856 /*
2857 * Most of the time we can say "there are changes"
2858 * only by checking if there are changed paths, but
2859 * --ignore-whitespace* options force us to look
2860 * inside contents.
2861 */
2862
2863 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
2864 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
2865 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
2866 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
2867 else
2868 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
2869
2870 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2871 options->detect_rename = DIFF_DETECT_COPY;
2872
2873 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2874 options->prefix = NULL;
2875 if (options->prefix)
2876 options->prefix_length = strlen(options->prefix);
2877 else
2878 options->prefix_length = 0;
2879
2880 if (options->output_format & (DIFF_FORMAT_NAME |
2881 DIFF_FORMAT_NAME_STATUS |
2882 DIFF_FORMAT_CHECKDIFF |
2883 DIFF_FORMAT_NO_OUTPUT))
2884 options->output_format &= ~(DIFF_FORMAT_RAW |
2885 DIFF_FORMAT_NUMSTAT |
2886 DIFF_FORMAT_DIFFSTAT |
2887 DIFF_FORMAT_SHORTSTAT |
2888 DIFF_FORMAT_DIRSTAT |
2889 DIFF_FORMAT_SUMMARY |
2890 DIFF_FORMAT_PATCH);
2891
2892 /*
2893 * These cases always need recursive; we do not drop caller-supplied
2894 * recursive bits for other formats here.
2895 */
2896 if (options->output_format & (DIFF_FORMAT_PATCH |
2897 DIFF_FORMAT_NUMSTAT |
2898 DIFF_FORMAT_DIFFSTAT |
2899 DIFF_FORMAT_SHORTSTAT |
2900 DIFF_FORMAT_DIRSTAT |
2901 DIFF_FORMAT_SUMMARY |
2902 DIFF_FORMAT_CHECKDIFF))
2903 DIFF_OPT_SET(options, RECURSIVE);
2904 /*
2905 * Also pickaxe would not work very well if you do not say recursive
2906 */
2907 if (options->pickaxe)
2908 DIFF_OPT_SET(options, RECURSIVE);
2909 /*
2910 * When patches are generated, submodules diffed against the work tree
2911 * must be checked for dirtiness too so it can be shown in the output
2912 */
2913 if (options->output_format & DIFF_FORMAT_PATCH)
2914 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
2915
2916 if (options->detect_rename && options->rename_limit < 0)
2917 options->rename_limit = diff_rename_limit_default;
2918 if (options->setup & DIFF_SETUP_USE_CACHE) {
2919 if (!active_cache)
2920 /* read-cache does not die even when it fails
2921 * so it is safe for us to do this here. Also
2922 * it does not smudge active_cache or active_nr
2923 * when it fails, so we do not have to worry about
2924 * cleaning it up ourselves either.
2925 */
2926 read_cache();
2927 }
2928 if (options->abbrev <= 0 || 40 < options->abbrev)
2929 options->abbrev = 40; /* full */
2930
2931 /*
2932 * It does not make sense to show the first hit we happened
2933 * to have found. It does not make sense not to return with
2934 * exit code in such a case either.
2935 */
2936 if (DIFF_OPT_TST(options, QUICK)) {
2937 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2938 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2939 }
2940
2941 return 0;
2942 }
2943
2944 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2945 {
2946 char c, *eq;
2947 int len;
2948
2949 if (*arg != '-')
2950 return 0;
2951 c = *++arg;
2952 if (!c)
2953 return 0;
2954 if (c == arg_short) {
2955 c = *++arg;
2956 if (!c)
2957 return 1;
2958 if (val && isdigit(c)) {
2959 char *end;
2960 int n = strtoul(arg, &end, 10);
2961 if (*end)
2962 return 0;
2963 *val = n;
2964 return 1;
2965 }
2966 return 0;
2967 }
2968 if (c != '-')
2969 return 0;
2970 arg++;
2971 eq = strchr(arg, '=');
2972 if (eq)
2973 len = eq - arg;
2974 else
2975 len = strlen(arg);
2976 if (!len || strncmp(arg, arg_long, len))
2977 return 0;
2978 if (eq) {
2979 int n;
2980 char *end;
2981 if (!isdigit(*++eq))
2982 return 0;
2983 n = strtoul(eq, &end, 10);
2984 if (*end)
2985 return 0;
2986 *val = n;
2987 }
2988 return 1;
2989 }
2990
2991 static int diff_scoreopt_parse(const char *opt);
2992
2993 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2994 {
2995 const char *arg = av[0];
2996
2997 /* Output format options */
2998 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
2999 options->output_format |= DIFF_FORMAT_PATCH;
3000 else if (opt_arg(arg, 'U', "unified", &options->context))
3001 options->output_format |= DIFF_FORMAT_PATCH;
3002 else if (!strcmp(arg, "--raw"))
3003 options->output_format |= DIFF_FORMAT_RAW;
3004 else if (!strcmp(arg, "--patch-with-raw"))
3005 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3006 else if (!strcmp(arg, "--numstat"))
3007 options->output_format |= DIFF_FORMAT_NUMSTAT;
3008 else if (!strcmp(arg, "--shortstat"))
3009 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3010 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
3011 options->output_format |= DIFF_FORMAT_DIRSTAT;
3012 else if (!strcmp(arg, "--cumulative")) {
3013 options->output_format |= DIFF_FORMAT_DIRSTAT;
3014 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
3015 } else if (opt_arg(arg, 0, "dirstat-by-file",
3016 &options->dirstat_percent)) {
3017 options->output_format |= DIFF_FORMAT_DIRSTAT;
3018 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
3019 }
3020 else if (!strcmp(arg, "--check"))
3021 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3022 else if (!strcmp(arg, "--summary"))
3023 options->output_format |= DIFF_FORMAT_SUMMARY;
3024 else if (!strcmp(arg, "--patch-with-stat"))
3025 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3026 else if (!strcmp(arg, "--name-only"))
3027 options->output_format |= DIFF_FORMAT_NAME;
3028 else if (!strcmp(arg, "--name-status"))
3029 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3030 else if (!strcmp(arg, "-s"))
3031 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3032 else if (!prefixcmp(arg, "--stat")) {
3033 char *end;
3034 int width = options->stat_width;
3035 int name_width = options->stat_name_width;
3036 arg += 6;
3037 end = (char *)arg;
3038
3039 switch (*arg) {
3040 case '-':
3041 if (!prefixcmp(arg, "-width="))
3042 width = strtoul(arg + 7, &end, 10);
3043 else if (!prefixcmp(arg, "-name-width="))
3044 name_width = strtoul(arg + 12, &end, 10);
3045 break;
3046 case '=':
3047 width = strtoul(arg+1, &end, 10);
3048 if (*end == ',')
3049 name_width = strtoul(end+1, &end, 10);
3050 }
3051
3052 /* Important! This checks all the error cases! */
3053 if (*end)
3054 return 0;
3055 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3056 options->stat_name_width = name_width;
3057 options->stat_width = width;
3058 }
3059
3060 /* renames options */
3061 else if (!prefixcmp(arg, "-B")) {
3062 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3063 return -1;
3064 }
3065 else if (!prefixcmp(arg, "-M")) {
3066 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3067 return -1;
3068 options->detect_rename = DIFF_DETECT_RENAME;
3069 }
3070 else if (!prefixcmp(arg, "-C")) {
3071 if (options->detect_rename == DIFF_DETECT_COPY)
3072 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3073 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3074 return -1;
3075 options->detect_rename = DIFF_DETECT_COPY;
3076 }
3077 else if (!strcmp(arg, "--no-renames"))
3078 options->detect_rename = 0;
3079 else if (!strcmp(arg, "--relative"))
3080 DIFF_OPT_SET(options, RELATIVE_NAME);
3081 else if (!prefixcmp(arg, "--relative=")) {
3082 DIFF_OPT_SET(options, RELATIVE_NAME);
3083 options->prefix = arg + 11;
3084 }
3085
3086 /* xdiff options */
3087 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3088 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3089 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3090 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3091 else if (!strcmp(arg, "--ignore-space-at-eol"))
3092 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3093 else if (!strcmp(arg, "--patience"))
3094 DIFF_XDL_SET(options, PATIENCE_DIFF);
3095
3096 /* flags options */
3097 else if (!strcmp(arg, "--binary")) {
3098 options->output_format |= DIFF_FORMAT_PATCH;
3099 DIFF_OPT_SET(options, BINARY);
3100 }
3101 else if (!strcmp(arg, "--full-index"))
3102 DIFF_OPT_SET(options, FULL_INDEX);
3103 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3104 DIFF_OPT_SET(options, TEXT);
3105 else if (!strcmp(arg, "-R"))
3106 DIFF_OPT_SET(options, REVERSE_DIFF);
3107 else if (!strcmp(arg, "--find-copies-harder"))
3108 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3109 else if (!strcmp(arg, "--follow"))
3110 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3111 else if (!strcmp(arg, "--color"))
3112 DIFF_OPT_SET(options, COLOR_DIFF);
3113 else if (!prefixcmp(arg, "--color=")) {
3114 int value = git_config_colorbool(NULL, arg+8, -1);
3115 if (value == 0)
3116 DIFF_OPT_CLR(options, COLOR_DIFF);
3117 else if (value > 0)
3118 DIFF_OPT_SET(options, COLOR_DIFF);
3119 else
3120 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3121 }
3122 else if (!strcmp(arg, "--no-color"))
3123 DIFF_OPT_CLR(options, COLOR_DIFF);
3124 else if (!strcmp(arg, "--color-words")) {
3125 DIFF_OPT_SET(options, COLOR_DIFF);
3126 options->word_diff = DIFF_WORDS_COLOR;
3127 }
3128 else if (!prefixcmp(arg, "--color-words=")) {
3129 DIFF_OPT_SET(options, COLOR_DIFF);
3130 options->word_diff = DIFF_WORDS_COLOR;
3131 options->word_regex = arg + 14;
3132 }
3133 else if (!strcmp(arg, "--word-diff")) {
3134 if (options->word_diff == DIFF_WORDS_NONE)
3135 options->word_diff = DIFF_WORDS_PLAIN;
3136 }
3137 else if (!prefixcmp(arg, "--word-diff=")) {
3138 const char *type = arg + 12;
3139 if (!strcmp(type, "plain"))
3140 options->word_diff = DIFF_WORDS_PLAIN;
3141 else if (!strcmp(type, "color")) {
3142 DIFF_OPT_SET(options, COLOR_DIFF);
3143 options->word_diff = DIFF_WORDS_COLOR;
3144 }
3145 else if (!strcmp(type, "porcelain"))
3146 options->word_diff = DIFF_WORDS_PORCELAIN;
3147 else if (!strcmp(type, "none"))
3148 options->word_diff = DIFF_WORDS_NONE;
3149 else
3150 die("bad --word-diff argument: %s", type);
3151 }
3152 else if (!prefixcmp(arg, "--word-diff-regex=")) {
3153 if (options->word_diff == DIFF_WORDS_NONE)
3154 options->word_diff = DIFF_WORDS_PLAIN;
3155 options->word_regex = arg + 18;
3156 }
3157 else if (!strcmp(arg, "--exit-code"))
3158 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3159 else if (!strcmp(arg, "--quiet"))
3160 DIFF_OPT_SET(options, QUICK);
3161 else if (!strcmp(arg, "--ext-diff"))
3162 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3163 else if (!strcmp(arg, "--no-ext-diff"))
3164 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3165 else if (!strcmp(arg, "--textconv"))
3166 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3167 else if (!strcmp(arg, "--no-textconv"))
3168 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3169 else if (!strcmp(arg, "--ignore-submodules"))
3170 handle_ignore_submodules_arg(options, "all");
3171 else if (!prefixcmp(arg, "--ignore-submodules="))
3172 handle_ignore_submodules_arg(options, arg + 20);
3173 else if (!strcmp(arg, "--submodule"))
3174 DIFF_OPT_SET(options, SUBMODULE_LOG);
3175 else if (!prefixcmp(arg, "--submodule=")) {
3176 if (!strcmp(arg + 12, "log"))
3177 DIFF_OPT_SET(options, SUBMODULE_LOG);
3178 }
3179
3180 /* misc options */
3181 else if (!strcmp(arg, "-z"))
3182 options->line_termination = 0;
3183 else if (!prefixcmp(arg, "-l"))
3184 options->rename_limit = strtoul(arg+2, NULL, 10);
3185 else if (!prefixcmp(arg, "-S"))
3186 options->pickaxe = arg + 2;
3187 else if (!strcmp(arg, "--pickaxe-all"))
3188 options->pickaxe_opts = DIFF_PICKAXE_ALL;
3189 else if (!strcmp(arg, "--pickaxe-regex"))
3190 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
3191 else if (!prefixcmp(arg, "-O"))
3192 options->orderfile = arg + 2;
3193 else if (!prefixcmp(arg, "--diff-filter="))
3194 options->filter = arg + 14;
3195 else if (!strcmp(arg, "--abbrev"))
3196 options->abbrev = DEFAULT_ABBREV;
3197 else if (!prefixcmp(arg, "--abbrev=")) {
3198 options->abbrev = strtoul(arg + 9, NULL, 10);
3199 if (options->abbrev < MINIMUM_ABBREV)
3200 options->abbrev = MINIMUM_ABBREV;
3201 else if (40 < options->abbrev)
3202 options->abbrev = 40;
3203 }
3204 else if (!prefixcmp(arg, "--src-prefix="))
3205 options->a_prefix = arg + 13;
3206 else if (!prefixcmp(arg, "--dst-prefix="))
3207 options->b_prefix = arg + 13;
3208 else if (!strcmp(arg, "--no-prefix"))
3209 options->a_prefix = options->b_prefix = "";
3210 else if (opt_arg(arg, '\0', "inter-hunk-context",
3211 &options->interhunkcontext))
3212 ;
3213 else if (!prefixcmp(arg, "--output=")) {
3214 options->file = fopen(arg + strlen("--output="), "w");
3215 if (!options->file)
3216 die_errno("Could not open '%s'", arg + strlen("--output="));
3217 options->close_file = 1;
3218 } else
3219 return 0;
3220 return 1;
3221 }
3222
3223 static int parse_num(const char **cp_p)
3224 {
3225 unsigned long num, scale;
3226 int ch, dot;
3227 const char *cp = *cp_p;
3228
3229 num = 0;
3230 scale = 1;
3231 dot = 0;
3232 for (;;) {
3233 ch = *cp;
3234 if ( !dot && ch == '.' ) {
3235 scale = 1;
3236 dot = 1;
3237 } else if ( ch == '%' ) {
3238 scale = dot ? scale*100 : 100;
3239 cp++; /* % is always at the end */
3240 break;
3241 } else if ( ch >= '0' && ch <= '9' ) {
3242 if ( scale < 100000 ) {
3243 scale *= 10;
3244 num = (num*10) + (ch-'0');
3245 }
3246 } else {
3247 break;
3248 }
3249 cp++;
3250 }
3251 *cp_p = cp;
3252
3253 /* user says num divided by scale and we say internally that
3254 * is MAX_SCORE * num / scale.
3255 */
3256 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3257 }
3258
3259 static int diff_scoreopt_parse(const char *opt)
3260 {
3261 int opt1, opt2, cmd;
3262
3263 if (*opt++ != '-')
3264 return -1;
3265 cmd = *opt++;
3266 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3267 return -1; /* that is not a -M, -C nor -B option */
3268
3269 opt1 = parse_num(&opt);
3270 if (cmd != 'B')
3271 opt2 = 0;
3272 else {
3273 if (*opt == 0)
3274 opt2 = 0;
3275 else if (*opt != '/')
3276 return -1; /* we expect -B80/99 or -B80 */
3277 else {
3278 opt++;
3279 opt2 = parse_num(&opt);
3280 }
3281 }
3282 if (*opt != 0)
3283 return -1;
3284 return opt1 | (opt2 << 16);
3285 }
3286
3287 struct diff_queue_struct diff_queued_diff;
3288
3289 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3290 {
3291 if (queue->alloc <= queue->nr) {
3292 queue->alloc = alloc_nr(queue->alloc);
3293 queue->queue = xrealloc(queue->queue,
3294 sizeof(dp) * queue->alloc);
3295 }
3296 queue->queue[queue->nr++] = dp;
3297 }
3298
3299 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3300 struct diff_filespec *one,
3301 struct diff_filespec *two)
3302 {
3303 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3304 dp->one = one;
3305 dp->two = two;
3306 if (queue)
3307 diff_q(queue, dp);
3308 return dp;
3309 }
3310
3311 void diff_free_filepair(struct diff_filepair *p)
3312 {
3313 free_filespec(p->one);
3314 free_filespec(p->two);
3315 free(p);
3316 }
3317
3318 /* This is different from find_unique_abbrev() in that
3319 * it stuffs the result with dots for alignment.
3320 */
3321 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3322 {
3323 int abblen;
3324 const char *abbrev;
3325 if (len == 40)
3326 return sha1_to_hex(sha1);
3327
3328 abbrev = find_unique_abbrev(sha1, len);
3329 abblen = strlen(abbrev);
3330 if (abblen < 37) {
3331 static char hex[41];
3332 if (len < abblen && abblen <= len + 2)
3333 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3334 else
3335 sprintf(hex, "%s...", abbrev);
3336 return hex;
3337 }
3338 return sha1_to_hex(sha1);
3339 }
3340
3341 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3342 {
3343 int line_termination = opt->line_termination;
3344 int inter_name_termination = line_termination ? '\t' : '\0';
3345 if (opt->output_prefix) {
3346 struct strbuf *msg = NULL;
3347 msg = opt->output_prefix(opt, opt->output_prefix_data);
3348 fprintf(opt->file, "%s", msg->buf);
3349 }
3350
3351 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3352 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3353 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3354 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3355 }
3356 if (p->score) {
3357 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3358 inter_name_termination);
3359 } else {
3360 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3361 }
3362
3363 if (p->status == DIFF_STATUS_COPIED ||
3364 p->status == DIFF_STATUS_RENAMED) {
3365 const char *name_a, *name_b;
3366 name_a = p->one->path;
3367 name_b = p->two->path;
3368 strip_prefix(opt->prefix_length, &name_a, &name_b);
3369 write_name_quoted(name_a, opt->file, inter_name_termination);
3370 write_name_quoted(name_b, opt->file, line_termination);
3371 } else {
3372 const char *name_a, *name_b;
3373 name_a = p->one->mode ? p->one->path : p->two->path;
3374 name_b = NULL;
3375 strip_prefix(opt->prefix_length, &name_a, &name_b);
3376 write_name_quoted(name_a, opt->file, line_termination);
3377 }
3378 }
3379
3380 int diff_unmodified_pair(struct diff_filepair *p)
3381 {
3382 /* This function is written stricter than necessary to support
3383 * the currently implemented transformers, but the idea is to
3384 * let transformers to produce diff_filepairs any way they want,
3385 * and filter and clean them up here before producing the output.
3386 */
3387 struct diff_filespec *one = p->one, *two = p->two;
3388
3389 if (DIFF_PAIR_UNMERGED(p))
3390 return 0; /* unmerged is interesting */
3391
3392 /* deletion, addition, mode or type change
3393 * and rename are all interesting.
3394 */
3395 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3396 DIFF_PAIR_MODE_CHANGED(p) ||
3397 strcmp(one->path, two->path))
3398 return 0;
3399
3400 /* both are valid and point at the same path. that is, we are
3401 * dealing with a change.
3402 */
3403 if (one->sha1_valid && two->sha1_valid &&
3404 !hashcmp(one->sha1, two->sha1) &&
3405 !one->dirty_submodule && !two->dirty_submodule)
3406 return 1; /* no change */
3407 if (!one->sha1_valid && !two->sha1_valid)
3408 return 1; /* both look at the same file on the filesystem. */
3409 return 0;
3410 }
3411
3412 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3413 {
3414 if (diff_unmodified_pair(p))
3415 return;
3416
3417 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3418 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3419 return; /* no tree diffs in patch format */
3420
3421 run_diff(p, o);
3422 }
3423
3424 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3425 struct diffstat_t *diffstat)
3426 {
3427 if (diff_unmodified_pair(p))
3428 return;
3429
3430 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3431 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3432 return; /* no tree diffs in patch format */
3433
3434 run_diffstat(p, o, diffstat);
3435 }
3436
3437 static void diff_flush_checkdiff(struct diff_filepair *p,
3438 struct diff_options *o)
3439 {
3440 if (diff_unmodified_pair(p))
3441 return;
3442
3443 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3444 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3445 return; /* no tree diffs in patch format */
3446
3447 run_checkdiff(p, o);
3448 }
3449
3450 int diff_queue_is_empty(void)
3451 {
3452 struct diff_queue_struct *q = &diff_queued_diff;
3453 int i;
3454 for (i = 0; i < q->nr; i++)
3455 if (!diff_unmodified_pair(q->queue[i]))
3456 return 0;
3457 return 1;
3458 }
3459
3460 #if DIFF_DEBUG
3461 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3462 {
3463 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3464 x, one ? one : "",
3465 s->path,
3466 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3467 s->mode,
3468 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3469 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3470 x, one ? one : "",
3471 s->size, s->xfrm_flags);
3472 }
3473
3474 void diff_debug_filepair(const struct diff_filepair *p, int i)
3475 {
3476 diff_debug_filespec(p->one, i, "one");
3477 diff_debug_filespec(p->two, i, "two");
3478 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3479 p->score, p->status ? p->status : '?',
3480 p->one->rename_used, p->broken_pair);
3481 }
3482
3483 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3484 {
3485 int i;
3486 if (msg)
3487 fprintf(stderr, "%s\n", msg);
3488 fprintf(stderr, "q->nr = %d\n", q->nr);
3489 for (i = 0; i < q->nr; i++) {
3490 struct diff_filepair *p = q->queue[i];
3491 diff_debug_filepair(p, i);
3492 }
3493 }
3494 #endif
3495
3496 static void diff_resolve_rename_copy(void)
3497 {
3498 int i;
3499 struct diff_filepair *p;
3500 struct diff_queue_struct *q = &diff_queued_diff;
3501
3502 diff_debug_queue("resolve-rename-copy", q);
3503
3504 for (i = 0; i < q->nr; i++) {
3505 p = q->queue[i];
3506 p->status = 0; /* undecided */
3507 if (DIFF_PAIR_UNMERGED(p))
3508 p->status = DIFF_STATUS_UNMERGED;
3509 else if (!DIFF_FILE_VALID(p->one))
3510 p->status = DIFF_STATUS_ADDED;
3511 else if (!DIFF_FILE_VALID(p->two))
3512 p->status = DIFF_STATUS_DELETED;
3513 else if (DIFF_PAIR_TYPE_CHANGED(p))
3514 p->status = DIFF_STATUS_TYPE_CHANGED;
3515
3516 /* from this point on, we are dealing with a pair
3517 * whose both sides are valid and of the same type, i.e.
3518 * either in-place edit or rename/copy edit.
3519 */
3520 else if (DIFF_PAIR_RENAME(p)) {
3521 /*
3522 * A rename might have re-connected a broken
3523 * pair up, causing the pathnames to be the
3524 * same again. If so, that's not a rename at
3525 * all, just a modification..
3526 *
3527 * Otherwise, see if this source was used for
3528 * multiple renames, in which case we decrement
3529 * the count, and call it a copy.
3530 */
3531 if (!strcmp(p->one->path, p->two->path))
3532 p->status = DIFF_STATUS_MODIFIED;
3533 else if (--p->one->rename_used > 0)
3534 p->status = DIFF_STATUS_COPIED;
3535 else
3536 p->status = DIFF_STATUS_RENAMED;
3537 }
3538 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3539 p->one->mode != p->two->mode ||
3540 p->one->dirty_submodule ||
3541 p->two->dirty_submodule ||
3542 is_null_sha1(p->one->sha1))
3543 p->status = DIFF_STATUS_MODIFIED;
3544 else {
3545 /* This is a "no-change" entry and should not
3546 * happen anymore, but prepare for broken callers.
3547 */
3548 error("feeding unmodified %s to diffcore",
3549 p->one->path);
3550 p->status = DIFF_STATUS_UNKNOWN;
3551 }
3552 }
3553 diff_debug_queue("resolve-rename-copy done", q);
3554 }
3555
3556 static int check_pair_status(struct diff_filepair *p)
3557 {
3558 switch (p->status) {
3559 case DIFF_STATUS_UNKNOWN:
3560 return 0;
3561 case 0:
3562 die("internal error in diff-resolve-rename-copy");
3563 default:
3564 return 1;
3565 }
3566 }
3567
3568 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3569 {
3570 int fmt = opt->output_format;
3571
3572 if (fmt & DIFF_FORMAT_CHECKDIFF)
3573 diff_flush_checkdiff(p, opt);
3574 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3575 diff_flush_raw(p, opt);
3576 else if (fmt & DIFF_FORMAT_NAME) {
3577 const char *name_a, *name_b;
3578 name_a = p->two->path;
3579 name_b = NULL;
3580 strip_prefix(opt->prefix_length, &name_a, &name_b);
3581 write_name_quoted(name_a, opt->file, opt->line_termination);
3582 }
3583 }
3584
3585 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3586 {
3587 if (fs->mode)
3588 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3589 else
3590 fprintf(file, " %s ", newdelete);
3591 write_name_quoted(fs->path, file, '\n');
3592 }
3593
3594
3595 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
3596 const char *line_prefix)
3597 {
3598 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3599 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
3600 p->two->mode, show_name ? ' ' : '\n');
3601 if (show_name) {
3602 write_name_quoted(p->two->path, file, '\n');
3603 }
3604 }
3605 }
3606
3607 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
3608 const char *line_prefix)
3609 {
3610 char *names = pprint_rename(p->one->path, p->two->path);
3611
3612 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3613 free(names);
3614 show_mode_change(file, p, 0, line_prefix);
3615 }
3616
3617 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
3618 {
3619 FILE *file = opt->file;
3620 char *line_prefix = "";
3621
3622 if (opt->output_prefix) {
3623 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
3624 line_prefix = buf->buf;
3625 }
3626
3627 switch(p->status) {
3628 case DIFF_STATUS_DELETED:
3629 fputs(line_prefix, file);
3630 show_file_mode_name(file, "delete", p->one);
3631 break;
3632 case DIFF_STATUS_ADDED:
3633 fputs(line_prefix, file);
3634 show_file_mode_name(file, "create", p->two);
3635 break;
3636 case DIFF_STATUS_COPIED:
3637 fputs(line_prefix, file);
3638 show_rename_copy(file, "copy", p, line_prefix);
3639 break;
3640 case DIFF_STATUS_RENAMED:
3641 fputs(line_prefix, file);
3642 show_rename_copy(file, "rename", p, line_prefix);
3643 break;
3644 default:
3645 if (p->score) {
3646 fprintf(file, "%s rewrite ", line_prefix);
3647 write_name_quoted(p->two->path, file, ' ');
3648 fprintf(file, "(%d%%)\n", similarity_index(p));
3649 }
3650 show_mode_change(file, p, !p->score, line_prefix);
3651 break;
3652 }
3653 }
3654
3655 struct patch_id_t {
3656 git_SHA_CTX *ctx;
3657 int patchlen;
3658 };
3659
3660 static int remove_space(char *line, int len)
3661 {
3662 int i;
3663 char *dst = line;
3664 unsigned char c;
3665
3666 for (i = 0; i < len; i++)
3667 if (!isspace((c = line[i])))
3668 *dst++ = c;
3669
3670 return dst - line;
3671 }
3672
3673 static void patch_id_consume(void *priv, char *line, unsigned long len)
3674 {
3675 struct patch_id_t *data = priv;
3676 int new_len;
3677
3678 /* Ignore line numbers when computing the SHA1 of the patch */
3679 if (!prefixcmp(line, "@@ -"))
3680 return;
3681
3682 new_len = remove_space(line, len);
3683
3684 git_SHA1_Update(data->ctx, line, new_len);
3685 data->patchlen += new_len;
3686 }
3687
3688 /* returns 0 upon success, and writes result into sha1 */
3689 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3690 {
3691 struct diff_queue_struct *q = &diff_queued_diff;
3692 int i;
3693 git_SHA_CTX ctx;
3694 struct patch_id_t data;
3695 char buffer[PATH_MAX * 4 + 20];
3696
3697 git_SHA1_Init(&ctx);
3698 memset(&data, 0, sizeof(struct patch_id_t));
3699 data.ctx = &ctx;
3700
3701 for (i = 0; i < q->nr; i++) {
3702 xpparam_t xpp;
3703 xdemitconf_t xecfg;
3704 mmfile_t mf1, mf2;
3705 struct diff_filepair *p = q->queue[i];
3706 int len1, len2;
3707
3708 memset(&xpp, 0, sizeof(xpp));
3709 memset(&xecfg, 0, sizeof(xecfg));
3710 if (p->status == 0)
3711 return error("internal diff status error");
3712 if (p->status == DIFF_STATUS_UNKNOWN)
3713 continue;
3714 if (diff_unmodified_pair(p))
3715 continue;
3716 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3717 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3718 continue;
3719 if (DIFF_PAIR_UNMERGED(p))
3720 continue;
3721
3722 diff_fill_sha1_info(p->one);
3723 diff_fill_sha1_info(p->two);
3724 if (fill_mmfile(&mf1, p->one) < 0 ||
3725 fill_mmfile(&mf2, p->two) < 0)
3726 return error("unable to read files to diff");
3727
3728 len1 = remove_space(p->one->path, strlen(p->one->path));
3729 len2 = remove_space(p->two->path, strlen(p->two->path));
3730 if (p->one->mode == 0)
3731 len1 = snprintf(buffer, sizeof(buffer),
3732 "diff--gita/%.*sb/%.*s"
3733 "newfilemode%06o"
3734 "---/dev/null"
3735 "+++b/%.*s",
3736 len1, p->one->path,
3737 len2, p->two->path,
3738 p->two->mode,
3739 len2, p->two->path);
3740 else if (p->two->mode == 0)
3741 len1 = snprintf(buffer, sizeof(buffer),
3742 "diff--gita/%.*sb/%.*s"
3743 "deletedfilemode%06o"
3744 "---a/%.*s"
3745 "+++/dev/null",
3746 len1, p->one->path,
3747 len2, p->two->path,
3748 p->one->mode,
3749 len1, p->one->path);
3750 else
3751 len1 = snprintf(buffer, sizeof(buffer),
3752 "diff--gita/%.*sb/%.*s"
3753 "---a/%.*s"
3754 "+++b/%.*s",
3755 len1, p->one->path,
3756 len2, p->two->path,
3757 len1, p->one->path,
3758 len2, p->two->path);
3759 git_SHA1_Update(&ctx, buffer, len1);
3760
3761 xpp.flags = 0;
3762 xecfg.ctxlen = 3;
3763 xecfg.flags = XDL_EMIT_FUNCNAMES;
3764 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3765 &xpp, &xecfg);
3766 }
3767
3768 git_SHA1_Final(sha1, &ctx);
3769 return 0;
3770 }
3771
3772 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3773 {
3774 struct diff_queue_struct *q = &diff_queued_diff;
3775 int i;
3776 int result = diff_get_patch_id(options, sha1);
3777
3778 for (i = 0; i < q->nr; i++)
3779 diff_free_filepair(q->queue[i]);
3780
3781 free(q->queue);
3782 DIFF_QUEUE_CLEAR(q);
3783
3784 return result;
3785 }
3786
3787 static int is_summary_empty(const struct diff_queue_struct *q)
3788 {
3789 int i;
3790
3791 for (i = 0; i < q->nr; i++) {
3792 const struct diff_filepair *p = q->queue[i];
3793
3794 switch (p->status) {
3795 case DIFF_STATUS_DELETED:
3796 case DIFF_STATUS_ADDED:
3797 case DIFF_STATUS_COPIED:
3798 case DIFF_STATUS_RENAMED:
3799 return 0;
3800 default:
3801 if (p->score)
3802 return 0;
3803 if (p->one->mode && p->two->mode &&
3804 p->one->mode != p->two->mode)
3805 return 0;
3806 break;
3807 }
3808 }
3809 return 1;
3810 }
3811
3812 void diff_flush(struct diff_options *options)
3813 {
3814 struct diff_queue_struct *q = &diff_queued_diff;
3815 int i, output_format = options->output_format;
3816 int separator = 0;
3817
3818 /*
3819 * Order: raw, stat, summary, patch
3820 * or: name/name-status/checkdiff (other bits clear)
3821 */
3822 if (!q->nr)
3823 goto free_queue;
3824
3825 if (output_format & (DIFF_FORMAT_RAW |
3826 DIFF_FORMAT_NAME |
3827 DIFF_FORMAT_NAME_STATUS |
3828 DIFF_FORMAT_CHECKDIFF)) {
3829 for (i = 0; i < q->nr; i++) {
3830 struct diff_filepair *p = q->queue[i];
3831 if (check_pair_status(p))
3832 flush_one_pair(p, options);
3833 }
3834 separator++;
3835 }
3836
3837 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3838 struct diffstat_t diffstat;
3839
3840 memset(&diffstat, 0, sizeof(struct diffstat_t));
3841 for (i = 0; i < q->nr; i++) {
3842 struct diff_filepair *p = q->queue[i];
3843 if (check_pair_status(p))
3844 diff_flush_stat(p, options, &diffstat);
3845 }
3846 if (output_format & DIFF_FORMAT_NUMSTAT)
3847 show_numstat(&diffstat, options);
3848 if (output_format & DIFF_FORMAT_DIFFSTAT)
3849 show_stats(&diffstat, options);
3850 if (output_format & DIFF_FORMAT_SHORTSTAT)
3851 show_shortstats(&diffstat, options);
3852 free_diffstat_info(&diffstat);
3853 separator++;
3854 }
3855 if (output_format & DIFF_FORMAT_DIRSTAT)
3856 show_dirstat(options);
3857
3858 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3859 for (i = 0; i < q->nr; i++) {
3860 diff_summary(options, q->queue[i]);
3861 }
3862 separator++;
3863 }
3864
3865 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
3866 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
3867 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
3868 /*
3869 * run diff_flush_patch for the exit status. setting
3870 * options->file to /dev/null should be safe, becaue we
3871 * aren't supposed to produce any output anyway.
3872 */
3873 if (options->close_file)
3874 fclose(options->file);
3875 options->file = fopen("/dev/null", "w");
3876 if (!options->file)
3877 die_errno("Could not open /dev/null");
3878 options->close_file = 1;
3879 for (i = 0; i < q->nr; i++) {
3880 struct diff_filepair *p = q->queue[i];
3881 if (check_pair_status(p))
3882 diff_flush_patch(p, options);
3883 if (options->found_changes)
3884 break;
3885 }
3886 }
3887
3888 if (output_format & DIFF_FORMAT_PATCH) {
3889 if (separator) {
3890 putc(options->line_termination, options->file);
3891 if (options->stat_sep) {
3892 /* attach patch instead of inline */
3893 fputs(options->stat_sep, options->file);
3894 }
3895 }
3896
3897 for (i = 0; i < q->nr; i++) {
3898 struct diff_filepair *p = q->queue[i];
3899 if (check_pair_status(p))
3900 diff_flush_patch(p, options);
3901 }
3902 }
3903
3904 if (output_format & DIFF_FORMAT_CALLBACK)
3905 options->format_callback(q, options, options->format_callback_data);
3906
3907 for (i = 0; i < q->nr; i++)
3908 diff_free_filepair(q->queue[i]);
3909 free_queue:
3910 free(q->queue);
3911 DIFF_QUEUE_CLEAR(q);
3912 if (options->close_file)
3913 fclose(options->file);
3914
3915 /*
3916 * Report the content-level differences with HAS_CHANGES;
3917 * diff_addremove/diff_change does not set the bit when
3918 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
3919 */
3920 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
3921 if (options->found_changes)
3922 DIFF_OPT_SET(options, HAS_CHANGES);
3923 else
3924 DIFF_OPT_CLR(options, HAS_CHANGES);
3925 }
3926 }
3927
3928 static void diffcore_apply_filter(const char *filter)
3929 {
3930 int i;
3931 struct diff_queue_struct *q = &diff_queued_diff;
3932 struct diff_queue_struct outq;
3933 DIFF_QUEUE_CLEAR(&outq);
3934
3935 if (!filter)
3936 return;
3937
3938 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3939 int found;
3940 for (i = found = 0; !found && i < q->nr; i++) {
3941 struct diff_filepair *p = q->queue[i];
3942 if (((p->status == DIFF_STATUS_MODIFIED) &&
3943 ((p->score &&
3944 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3945 (!p->score &&
3946 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3947 ((p->status != DIFF_STATUS_MODIFIED) &&
3948 strchr(filter, p->status)))
3949 found++;
3950 }
3951 if (found)
3952 return;
3953
3954 /* otherwise we will clear the whole queue
3955 * by copying the empty outq at the end of this
3956 * function, but first clear the current entries
3957 * in the queue.
3958 */
3959 for (i = 0; i < q->nr; i++)
3960 diff_free_filepair(q->queue[i]);
3961 }
3962 else {
3963 /* Only the matching ones */
3964 for (i = 0; i < q->nr; i++) {
3965 struct diff_filepair *p = q->queue[i];
3966
3967 if (((p->status == DIFF_STATUS_MODIFIED) &&
3968 ((p->score &&
3969 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3970 (!p->score &&
3971 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3972 ((p->status != DIFF_STATUS_MODIFIED) &&
3973 strchr(filter, p->status)))
3974 diff_q(&outq, p);
3975 else
3976 diff_free_filepair(p);
3977 }
3978 }
3979 free(q->queue);
3980 *q = outq;
3981 }
3982
3983 /* Check whether two filespecs with the same mode and size are identical */
3984 static int diff_filespec_is_identical(struct diff_filespec *one,
3985 struct diff_filespec *two)
3986 {
3987 if (S_ISGITLINK(one->mode))
3988 return 0;
3989 if (diff_populate_filespec(one, 0))
3990 return 0;
3991 if (diff_populate_filespec(two, 0))
3992 return 0;
3993 return !memcmp(one->data, two->data, one->size);
3994 }
3995
3996 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3997 {
3998 int i;
3999 struct diff_queue_struct *q = &diff_queued_diff;
4000 struct diff_queue_struct outq;
4001 DIFF_QUEUE_CLEAR(&outq);
4002
4003 for (i = 0; i < q->nr; i++) {
4004 struct diff_filepair *p = q->queue[i];
4005
4006 /*
4007 * 1. Entries that come from stat info dirtiness
4008 * always have both sides (iow, not create/delete),
4009 * one side of the object name is unknown, with
4010 * the same mode and size. Keep the ones that
4011 * do not match these criteria. They have real
4012 * differences.
4013 *
4014 * 2. At this point, the file is known to be modified,
4015 * with the same mode and size, and the object
4016 * name of one side is unknown. Need to inspect
4017 * the identical contents.
4018 */
4019 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4020 !DIFF_FILE_VALID(p->two) ||
4021 (p->one->sha1_valid && p->two->sha1_valid) ||
4022 (p->one->mode != p->two->mode) ||
4023 diff_populate_filespec(p->one, 1) ||
4024 diff_populate_filespec(p->two, 1) ||
4025 (p->one->size != p->two->size) ||
4026 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4027 diff_q(&outq, p);
4028 else {
4029 /*
4030 * The caller can subtract 1 from skip_stat_unmatch
4031 * to determine how many paths were dirty only
4032 * due to stat info mismatch.
4033 */
4034 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4035 diffopt->skip_stat_unmatch++;
4036 diff_free_filepair(p);
4037 }
4038 }
4039 free(q->queue);
4040 *q = outq;
4041 }
4042
4043 static int diffnamecmp(const void *a_, const void *b_)
4044 {
4045 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4046 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4047 const char *name_a, *name_b;
4048
4049 name_a = a->one ? a->one->path : a->two->path;
4050 name_b = b->one ? b->one->path : b->two->path;
4051 return strcmp(name_a, name_b);
4052 }
4053
4054 void diffcore_fix_diff_index(struct diff_options *options)
4055 {
4056 struct diff_queue_struct *q = &diff_queued_diff;
4057 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4058 }
4059
4060 void diffcore_std(struct diff_options *options)
4061 {
4062 /* We never run this function more than one time, because the
4063 * rename/copy detection logic can only run once.
4064 */
4065 if (diff_queued_diff.run)
4066 return;
4067
4068 if (options->skip_stat_unmatch)
4069 diffcore_skip_stat_unmatch(options);
4070 if (options->break_opt != -1)
4071 diffcore_break(options->break_opt);
4072 if (options->detect_rename)
4073 diffcore_rename(options);
4074 if (options->break_opt != -1)
4075 diffcore_merge_broken();
4076 if (options->pickaxe)
4077 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
4078 if (options->orderfile)
4079 diffcore_order(options->orderfile);
4080 diff_resolve_rename_copy();
4081 diffcore_apply_filter(options->filter);
4082
4083 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4084 DIFF_OPT_SET(options, HAS_CHANGES);
4085 else
4086 DIFF_OPT_CLR(options, HAS_CHANGES);
4087
4088 diff_queued_diff.run = 1;
4089 }
4090
4091 int diff_result_code(struct diff_options *opt, int status)
4092 {
4093 int result = 0;
4094 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4095 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4096 return status;
4097 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4098 DIFF_OPT_TST(opt, HAS_CHANGES))
4099 result |= 01;
4100 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4101 DIFF_OPT_TST(opt, CHECK_FAILED))
4102 result |= 02;
4103 return result;
4104 }
4105
4106 void diff_addremove(struct diff_options *options,
4107 int addremove, unsigned mode,
4108 const unsigned char *sha1,
4109 const char *concatpath, unsigned dirty_submodule)
4110 {
4111 struct diff_filespec *one, *two;
4112
4113 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
4114 return;
4115
4116 /* This may look odd, but it is a preparation for
4117 * feeding "there are unchanged files which should
4118 * not produce diffs, but when you are doing copy
4119 * detection you would need them, so here they are"
4120 * entries to the diff-core. They will be prefixed
4121 * with something like '=' or '*' (I haven't decided
4122 * which but should not make any difference).
4123 * Feeding the same new and old to diff_change()
4124 * also has the same effect.
4125 * Before the final output happens, they are pruned after
4126 * merged into rename/copy pairs as appropriate.
4127 */
4128 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4129 addremove = (addremove == '+' ? '-' :
4130 addremove == '-' ? '+' : addremove);
4131
4132 if (options->prefix &&
4133 strncmp(concatpath, options->prefix, options->prefix_length))
4134 return;
4135
4136 one = alloc_filespec(concatpath);
4137 two = alloc_filespec(concatpath);
4138
4139 if (addremove != '+')
4140 fill_filespec(one, sha1, mode);
4141 if (addremove != '-') {
4142 fill_filespec(two, sha1, mode);
4143 two->dirty_submodule = dirty_submodule;
4144 }
4145
4146 diff_queue(&diff_queued_diff, one, two);
4147 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4148 DIFF_OPT_SET(options, HAS_CHANGES);
4149 }
4150
4151 void diff_change(struct diff_options *options,
4152 unsigned old_mode, unsigned new_mode,
4153 const unsigned char *old_sha1,
4154 const unsigned char *new_sha1,
4155 const char *concatpath,
4156 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4157 {
4158 struct diff_filespec *one, *two;
4159
4160 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
4161 && S_ISGITLINK(new_mode))
4162 return;
4163
4164 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4165 unsigned tmp;
4166 const unsigned char *tmp_c;
4167 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4168 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4169 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4170 new_dirty_submodule = tmp;
4171 }
4172
4173 if (options->prefix &&
4174 strncmp(concatpath, options->prefix, options->prefix_length))
4175 return;
4176
4177 one = alloc_filespec(concatpath);
4178 two = alloc_filespec(concatpath);
4179 fill_filespec(one, old_sha1, old_mode);
4180 fill_filespec(two, new_sha1, new_mode);
4181 one->dirty_submodule = old_dirty_submodule;
4182 two->dirty_submodule = new_dirty_submodule;
4183
4184 diff_queue(&diff_queued_diff, one, two);
4185 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4186 DIFF_OPT_SET(options, HAS_CHANGES);
4187 }
4188
4189 void diff_unmerge(struct diff_options *options,
4190 const char *path,
4191 unsigned mode, const unsigned char *sha1)
4192 {
4193 struct diff_filespec *one, *two;
4194
4195 if (options->prefix &&
4196 strncmp(path, options->prefix, options->prefix_length))
4197 return;
4198
4199 one = alloc_filespec(path);
4200 two = alloc_filespec(path);
4201 fill_filespec(one, sha1, mode);
4202 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
4203 }
4204
4205 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4206 size_t *outsize)
4207 {
4208 struct diff_tempfile *temp;
4209 const char *argv[3];
4210 const char **arg = argv;
4211 struct child_process child;
4212 struct strbuf buf = STRBUF_INIT;
4213 int err = 0;
4214
4215 temp = prepare_temp_file(spec->path, spec);
4216 *arg++ = pgm;
4217 *arg++ = temp->name;
4218 *arg = NULL;
4219
4220 memset(&child, 0, sizeof(child));
4221 child.use_shell = 1;
4222 child.argv = argv;
4223 child.out = -1;
4224 if (start_command(&child)) {
4225 remove_tempfile();
4226 return NULL;
4227 }
4228
4229 if (strbuf_read(&buf, child.out, 0) < 0)
4230 err = error("error reading from textconv command '%s'", pgm);
4231 close(child.out);
4232
4233 if (finish_command(&child) || err) {
4234 strbuf_release(&buf);
4235 remove_tempfile();
4236 return NULL;
4237 }
4238 remove_tempfile();
4239
4240 return strbuf_detach(&buf, outsize);
4241 }
4242
4243 size_t fill_textconv(struct userdiff_driver *driver,
4244 struct diff_filespec *df,
4245 char **outbuf)
4246 {
4247 size_t size;
4248
4249 if (!driver || !driver->textconv) {
4250 if (!DIFF_FILE_VALID(df)) {
4251 *outbuf = "";
4252 return 0;
4253 }
4254 if (diff_populate_filespec(df, 0))
4255 die("unable to read files to diff");
4256 *outbuf = df->data;
4257 return df->size;
4258 }
4259
4260 if (driver->textconv_cache) {
4261 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4262 &size);
4263 if (*outbuf)
4264 return size;
4265 }
4266
4267 *outbuf = run_textconv(driver->textconv, df, &size);
4268 if (!*outbuf)
4269 die("unable to read files to diff");
4270
4271 if (driver->textconv_cache) {
4272 /* ignore errors, as we might be in a readonly repository */
4273 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4274 size);
4275 /*
4276 * we could save up changes and flush them all at the end,
4277 * but we would need an extra call after all diffing is done.
4278 * Since generating a cache entry is the slow path anyway,
4279 * this extra overhead probably isn't a big deal.
4280 */
4281 notes_cache_write(driver->textconv_cache);
4282 }
4283
4284 return size;
4285 }
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