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