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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"
17 #ifdef NO_FAST_WORKING_DIRECTORY
18 #define FAST_WORKING_DIRECTORY 0
19 #else
20 #define FAST_WORKING_DIRECTORY 1
21 #endif
23 static int diff_detect_rename_default;
24 static int diff_rename_limit_default = 200;
25 static int diff_suppress_blank_empty;
26 int diff_use_color_default = -1;
27 static const char *diff_word_regex_cfg;
28 static const char *external_diff_cmd_cfg;
29 int diff_auto_refresh_index = 1;
30 static int diff_mnemonic_prefix;
32 static char diff_colors[][COLOR_MAXLEN] = {
33 GIT_COLOR_RESET,
34 GIT_COLOR_NORMAL, /* PLAIN */
35 GIT_COLOR_BOLD, /* METAINFO */
36 GIT_COLOR_CYAN, /* FRAGINFO */
37 GIT_COLOR_RED, /* OLD */
38 GIT_COLOR_GREEN, /* NEW */
39 GIT_COLOR_YELLOW, /* COMMIT */
40 GIT_COLOR_BG_RED, /* WHITESPACE */
41 };
43 static void diff_filespec_load_driver(struct diff_filespec *one);
44 static char *run_textconv(const char *, struct diff_filespec *, size_t *);
46 static int parse_diff_color_slot(const char *var, int ofs)
47 {
48 if (!strcasecmp(var+ofs, "plain"))
49 return DIFF_PLAIN;
50 if (!strcasecmp(var+ofs, "meta"))
51 return DIFF_METAINFO;
52 if (!strcasecmp(var+ofs, "frag"))
53 return DIFF_FRAGINFO;
54 if (!strcasecmp(var+ofs, "old"))
55 return DIFF_FILE_OLD;
56 if (!strcasecmp(var+ofs, "new"))
57 return DIFF_FILE_NEW;
58 if (!strcasecmp(var+ofs, "commit"))
59 return DIFF_COMMIT;
60 if (!strcasecmp(var+ofs, "whitespace"))
61 return DIFF_WHITESPACE;
62 die("bad config variable '%s'", var);
63 }
65 static int git_config_rename(const char *var, const char *value)
66 {
67 if (!value)
68 return DIFF_DETECT_RENAME;
69 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
70 return DIFF_DETECT_COPY;
71 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
72 }
74 /*
75 * These are to give UI layer defaults.
76 * The core-level commands such as git-diff-files should
77 * never be affected by the setting of diff.renames
78 * the user happens to have in the configuration file.
79 */
80 int git_diff_ui_config(const char *var, const char *value, void *cb)
81 {
82 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
83 diff_use_color_default = git_config_colorbool(var, value, -1);
84 return 0;
85 }
86 if (!strcmp(var, "diff.renames")) {
87 diff_detect_rename_default = git_config_rename(var, value);
88 return 0;
89 }
90 if (!strcmp(var, "diff.autorefreshindex")) {
91 diff_auto_refresh_index = git_config_bool(var, value);
92 return 0;
93 }
94 if (!strcmp(var, "diff.mnemonicprefix")) {
95 diff_mnemonic_prefix = git_config_bool(var, value);
96 return 0;
97 }
98 if (!strcmp(var, "diff.external"))
99 return git_config_string(&external_diff_cmd_cfg, var, value);
100 if (!strcmp(var, "diff.wordregex"))
101 return git_config_string(&diff_word_regex_cfg, var, value);
103 return git_diff_basic_config(var, value, cb);
104 }
106 int git_diff_basic_config(const char *var, const char *value, void *cb)
107 {
108 if (!strcmp(var, "diff.renamelimit")) {
109 diff_rename_limit_default = git_config_int(var, value);
110 return 0;
111 }
113 switch (userdiff_config(var, value)) {
114 case 0: break;
115 case -1: return -1;
116 default: return 0;
117 }
119 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
120 int slot = parse_diff_color_slot(var, 11);
121 if (!value)
122 return config_error_nonbool(var);
123 color_parse(value, var, diff_colors[slot]);
124 return 0;
125 }
127 /* like GNU diff's --suppress-blank-empty option */
128 if (!strcmp(var, "diff.suppressblankempty") ||
129 /* for backwards compatibility */
130 !strcmp(var, "diff.suppress-blank-empty")) {
131 diff_suppress_blank_empty = git_config_bool(var, value);
132 return 0;
133 }
135 return git_color_default_config(var, value, cb);
136 }
138 static char *quote_two(const char *one, const char *two)
139 {
140 int need_one = quote_c_style(one, NULL, NULL, 1);
141 int need_two = quote_c_style(two, NULL, NULL, 1);
142 struct strbuf res = STRBUF_INIT;
144 if (need_one + need_two) {
145 strbuf_addch(&res, '"');
146 quote_c_style(one, &res, NULL, 1);
147 quote_c_style(two, &res, NULL, 1);
148 strbuf_addch(&res, '"');
149 } else {
150 strbuf_addstr(&res, one);
151 strbuf_addstr(&res, two);
152 }
153 return strbuf_detach(&res, NULL);
154 }
156 static const char *external_diff(void)
157 {
158 static const char *external_diff_cmd = NULL;
159 static int done_preparing = 0;
161 if (done_preparing)
162 return external_diff_cmd;
163 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
164 if (!external_diff_cmd)
165 external_diff_cmd = external_diff_cmd_cfg;
166 done_preparing = 1;
167 return external_diff_cmd;
168 }
170 static struct diff_tempfile {
171 const char *name; /* filename external diff should read from */
172 char hex[41];
173 char mode[10];
174 char tmp_path[PATH_MAX];
175 } diff_temp[2];
177 static struct diff_tempfile *claim_diff_tempfile(void) {
178 int i;
179 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
180 if (!diff_temp[i].name)
181 return diff_temp + i;
182 die("BUG: diff is failing to clean up its tempfiles");
183 }
185 static int remove_tempfile_installed;
187 static void remove_tempfile(void)
188 {
189 int i;
190 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
191 if (diff_temp[i].name == diff_temp[i].tmp_path)
192 unlink_or_warn(diff_temp[i].name);
193 diff_temp[i].name = NULL;
194 }
195 }
197 static void remove_tempfile_on_signal(int signo)
198 {
199 remove_tempfile();
200 sigchain_pop(signo);
201 raise(signo);
202 }
204 static int count_lines(const char *data, int size)
205 {
206 int count, ch, completely_empty = 1, nl_just_seen = 0;
207 count = 0;
208 while (0 < size--) {
209 ch = *data++;
210 if (ch == '\n') {
211 count++;
212 nl_just_seen = 1;
213 completely_empty = 0;
214 }
215 else {
216 nl_just_seen = 0;
217 completely_empty = 0;
218 }
219 }
220 if (completely_empty)
221 return 0;
222 if (!nl_just_seen)
223 count++; /* no trailing newline */
224 return count;
225 }
227 static void print_line_count(FILE *file, int count)
228 {
229 switch (count) {
230 case 0:
231 fprintf(file, "0,0");
232 break;
233 case 1:
234 fprintf(file, "1");
235 break;
236 default:
237 fprintf(file, "1,%d", count);
238 break;
239 }
240 }
242 static void copy_file_with_prefix(FILE *file,
243 int prefix, const char *data, int size,
244 const char *set, const char *reset)
245 {
246 int ch, nl_just_seen = 1;
247 while (0 < size--) {
248 ch = *data++;
249 if (nl_just_seen) {
250 fputs(set, file);
251 putc(prefix, file);
252 }
253 if (ch == '\n') {
254 nl_just_seen = 1;
255 fputs(reset, file);
256 } else
257 nl_just_seen = 0;
258 putc(ch, file);
259 }
260 if (!nl_just_seen)
261 fprintf(file, "%s\n\\ No newline at end of file\n", reset);
262 }
264 static void emit_rewrite_diff(const char *name_a,
265 const char *name_b,
266 struct diff_filespec *one,
267 struct diff_filespec *two,
268 const char *textconv_one,
269 const char *textconv_two,
270 struct diff_options *o)
271 {
272 int lc_a, lc_b;
273 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
274 const char *name_a_tab, *name_b_tab;
275 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
276 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
277 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
278 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
279 const char *reset = diff_get_color(color_diff, DIFF_RESET);
280 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
281 const char *a_prefix, *b_prefix;
282 const char *data_one, *data_two;
283 size_t size_one, size_two;
285 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
286 a_prefix = o->b_prefix;
287 b_prefix = o->a_prefix;
288 } else {
289 a_prefix = o->a_prefix;
290 b_prefix = o->b_prefix;
291 }
293 name_a += (*name_a == '/');
294 name_b += (*name_b == '/');
295 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
296 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
298 strbuf_reset(&a_name);
299 strbuf_reset(&b_name);
300 quote_two_c_style(&a_name, a_prefix, name_a, 0);
301 quote_two_c_style(&b_name, b_prefix, name_b, 0);
303 diff_populate_filespec(one, 0);
304 diff_populate_filespec(two, 0);
305 if (textconv_one) {
306 data_one = run_textconv(textconv_one, one, &size_one);
307 if (!data_one)
308 die("unable to read files to diff");
309 }
310 else {
311 data_one = one->data;
312 size_one = one->size;
313 }
314 if (textconv_two) {
315 data_two = run_textconv(textconv_two, two, &size_two);
316 if (!data_two)
317 die("unable to read files to diff");
318 }
319 else {
320 data_two = two->data;
321 size_two = two->size;
322 }
324 lc_a = count_lines(data_one, size_one);
325 lc_b = count_lines(data_two, size_two);
326 fprintf(o->file,
327 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
328 metainfo, a_name.buf, name_a_tab, reset,
329 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
330 print_line_count(o->file, lc_a);
331 fprintf(o->file, " +");
332 print_line_count(o->file, lc_b);
333 fprintf(o->file, " @@%s\n", reset);
334 if (lc_a)
335 copy_file_with_prefix(o->file, '-', data_one, size_one, old, reset);
336 if (lc_b)
337 copy_file_with_prefix(o->file, '+', data_two, size_two, new, reset);
338 }
340 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
341 {
342 if (!DIFF_FILE_VALID(one)) {
343 mf->ptr = (char *)""; /* does not matter */
344 mf->size = 0;
345 return 0;
346 }
347 else if (diff_populate_filespec(one, 0))
348 return -1;
350 mf->ptr = one->data;
351 mf->size = one->size;
352 return 0;
353 }
355 struct diff_words_buffer {
356 mmfile_t text;
357 long alloc;
358 struct diff_words_orig {
359 const char *begin, *end;
360 } *orig;
361 int orig_nr, orig_alloc;
362 };
364 static void diff_words_append(char *line, unsigned long len,
365 struct diff_words_buffer *buffer)
366 {
367 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
368 line++;
369 len--;
370 memcpy(buffer->text.ptr + buffer->text.size, line, len);
371 buffer->text.size += len;
372 buffer->text.ptr[buffer->text.size] = '\0';
373 }
375 struct diff_words_data {
376 struct diff_words_buffer minus, plus;
377 const char *current_plus;
378 FILE *file;
379 regex_t *word_regex;
380 };
382 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
383 {
384 struct diff_words_data *diff_words = priv;
385 int minus_first, minus_len, plus_first, plus_len;
386 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
388 if (line[0] != '@' || parse_hunk_header(line, len,
389 &minus_first, &minus_len, &plus_first, &plus_len))
390 return;
392 /* POSIX requires that first be decremented by one if len == 0... */
393 if (minus_len) {
394 minus_begin = diff_words->minus.orig[minus_first].begin;
395 minus_end =
396 diff_words->minus.orig[minus_first + minus_len - 1].end;
397 } else
398 minus_begin = minus_end =
399 diff_words->minus.orig[minus_first].end;
401 if (plus_len) {
402 plus_begin = diff_words->plus.orig[plus_first].begin;
403 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
404 } else
405 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
407 if (diff_words->current_plus != plus_begin)
408 fwrite(diff_words->current_plus,
409 plus_begin - diff_words->current_plus, 1,
410 diff_words->file);
411 if (minus_begin != minus_end)
412 color_fwrite_lines(diff_words->file,
413 diff_get_color(1, DIFF_FILE_OLD),
414 minus_end - minus_begin, minus_begin);
415 if (plus_begin != plus_end)
416 color_fwrite_lines(diff_words->file,
417 diff_get_color(1, DIFF_FILE_NEW),
418 plus_end - plus_begin, plus_begin);
420 diff_words->current_plus = plus_end;
421 }
423 /* This function starts looking at *begin, and returns 0 iff a word was found. */
424 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
425 int *begin, int *end)
426 {
427 if (word_regex && *begin < buffer->size) {
428 regmatch_t match[1];
429 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
430 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
431 '\n', match[0].rm_eo - match[0].rm_so);
432 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
433 *begin += match[0].rm_so;
434 return *begin >= *end;
435 }
436 return -1;
437 }
439 /* find the next word */
440 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
441 (*begin)++;
442 if (*begin >= buffer->size)
443 return -1;
445 /* find the end of the word */
446 *end = *begin + 1;
447 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
448 (*end)++;
450 return 0;
451 }
453 /*
454 * This function splits the words in buffer->text, stores the list with
455 * newline separator into out, and saves the offsets of the original words
456 * in buffer->orig.
457 */
458 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
459 regex_t *word_regex)
460 {
461 int i, j;
462 long alloc = 0;
464 out->size = 0;
465 out->ptr = NULL;
467 /* fake an empty "0th" word */
468 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
469 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
470 buffer->orig_nr = 1;
472 for (i = 0; i < buffer->text.size; i++) {
473 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
474 return;
476 /* store original boundaries */
477 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
478 buffer->orig_alloc);
479 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
480 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
481 buffer->orig_nr++;
483 /* store one word */
484 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
485 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
486 out->ptr[out->size + j - i] = '\n';
487 out->size += j - i + 1;
489 i = j - 1;
490 }
491 }
493 /* this executes the word diff on the accumulated buffers */
494 static void diff_words_show(struct diff_words_data *diff_words)
495 {
496 xpparam_t xpp;
497 xdemitconf_t xecfg;
498 xdemitcb_t ecb;
499 mmfile_t minus, plus;
501 /* special case: only removal */
502 if (!diff_words->plus.text.size) {
503 color_fwrite_lines(diff_words->file,
504 diff_get_color(1, DIFF_FILE_OLD),
505 diff_words->minus.text.size, diff_words->minus.text.ptr);
506 diff_words->minus.text.size = 0;
507 return;
508 }
510 diff_words->current_plus = diff_words->plus.text.ptr;
512 memset(&xpp, 0, sizeof(xpp));
513 memset(&xecfg, 0, sizeof(xecfg));
514 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
515 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
516 xpp.flags = XDF_NEED_MINIMAL;
517 /* as only the hunk header will be parsed, we need a 0-context */
518 xecfg.ctxlen = 0;
519 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
520 &xpp, &xecfg, &ecb);
521 free(minus.ptr);
522 free(plus.ptr);
523 if (diff_words->current_plus != diff_words->plus.text.ptr +
524 diff_words->plus.text.size)
525 fwrite(diff_words->current_plus,
526 diff_words->plus.text.ptr + diff_words->plus.text.size
527 - diff_words->current_plus, 1,
528 diff_words->file);
529 diff_words->minus.text.size = diff_words->plus.text.size = 0;
530 }
532 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
534 struct emit_callback {
535 int nparents, color_diff;
536 unsigned ws_rule;
537 sane_truncate_fn truncate;
538 const char **label_path;
539 struct diff_words_data *diff_words;
540 int *found_changesp;
541 FILE *file;
542 };
544 static void free_diff_words_data(struct emit_callback *ecbdata)
545 {
546 if (ecbdata->diff_words) {
547 /* flush buffers */
548 if (ecbdata->diff_words->minus.text.size ||
549 ecbdata->diff_words->plus.text.size)
550 diff_words_show(ecbdata->diff_words);
552 free (ecbdata->diff_words->minus.text.ptr);
553 free (ecbdata->diff_words->minus.orig);
554 free (ecbdata->diff_words->plus.text.ptr);
555 free (ecbdata->diff_words->plus.orig);
556 free(ecbdata->diff_words->word_regex);
557 free(ecbdata->diff_words);
558 ecbdata->diff_words = NULL;
559 }
560 }
562 const char *diff_get_color(int diff_use_color, enum color_diff ix)
563 {
564 if (diff_use_color)
565 return diff_colors[ix];
566 return "";
567 }
569 static void emit_line(FILE *file, const char *set, const char *reset, const char *line, int len)
570 {
571 int has_trailing_newline, has_trailing_carriage_return;
573 has_trailing_newline = (len > 0 && line[len-1] == '\n');
574 if (has_trailing_newline)
575 len--;
576 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
577 if (has_trailing_carriage_return)
578 len--;
580 fputs(set, file);
581 fwrite(line, len, 1, file);
582 fputs(reset, file);
583 if (has_trailing_carriage_return)
584 fputc('\r', file);
585 if (has_trailing_newline)
586 fputc('\n', file);
587 }
589 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
590 {
591 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
592 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
594 if (!*ws)
595 emit_line(ecbdata->file, set, reset, line, len);
596 else {
597 /* Emit just the prefix, then the rest. */
598 emit_line(ecbdata->file, set, reset, line, ecbdata->nparents);
599 ws_check_emit(line + ecbdata->nparents,
600 len - ecbdata->nparents, ecbdata->ws_rule,
601 ecbdata->file, set, reset, ws);
602 }
603 }
605 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
606 {
607 const char *cp;
608 unsigned long allot;
609 size_t l = len;
611 if (ecb->truncate)
612 return ecb->truncate(line, len);
613 cp = line;
614 allot = l;
615 while (0 < l) {
616 (void) utf8_width(&cp, &l);
617 if (!cp)
618 break; /* truncated in the middle? */
619 }
620 return allot - l;
621 }
623 static void fn_out_consume(void *priv, char *line, unsigned long len)
624 {
625 int i;
626 int color;
627 struct emit_callback *ecbdata = priv;
628 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
629 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
630 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
632 *(ecbdata->found_changesp) = 1;
634 if (ecbdata->label_path[0]) {
635 const char *name_a_tab, *name_b_tab;
637 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
638 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
640 fprintf(ecbdata->file, "%s--- %s%s%s\n",
641 meta, ecbdata->label_path[0], reset, name_a_tab);
642 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
643 meta, ecbdata->label_path[1], reset, name_b_tab);
644 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
645 }
647 if (diff_suppress_blank_empty
648 && len == 2 && line[0] == ' ' && line[1] == '\n') {
649 line[0] = '\n';
650 len = 1;
651 }
653 /* This is not really necessary for now because
654 * this codepath only deals with two-way diffs.
655 */
656 for (i = 0; i < len && line[i] == '@'; i++)
657 ;
658 if (2 <= i && i < len && line[i] == ' ') {
659 ecbdata->nparents = i - 1;
660 len = sane_truncate_line(ecbdata, line, len);
661 emit_line(ecbdata->file,
662 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
663 reset, line, len);
664 if (line[len-1] != '\n')
665 putc('\n', ecbdata->file);
666 return;
667 }
669 if (len < ecbdata->nparents) {
670 emit_line(ecbdata->file, reset, reset, line, len);
671 return;
672 }
674 color = DIFF_PLAIN;
675 if (ecbdata->diff_words && ecbdata->nparents != 1)
676 /* fall back to normal diff */
677 free_diff_words_data(ecbdata);
678 if (ecbdata->diff_words) {
679 if (line[0] == '-') {
680 diff_words_append(line, len,
681 &ecbdata->diff_words->minus);
682 return;
683 } else if (line[0] == '+') {
684 diff_words_append(line, len,
685 &ecbdata->diff_words->plus);
686 return;
687 }
688 if (ecbdata->diff_words->minus.text.size ||
689 ecbdata->diff_words->plus.text.size)
690 diff_words_show(ecbdata->diff_words);
691 line++;
692 len--;
693 emit_line(ecbdata->file, plain, reset, line, len);
694 return;
695 }
696 for (i = 0; i < ecbdata->nparents && len; i++) {
697 if (line[i] == '-')
698 color = DIFF_FILE_OLD;
699 else if (line[i] == '+')
700 color = DIFF_FILE_NEW;
701 }
703 if (color != DIFF_FILE_NEW) {
704 emit_line(ecbdata->file,
705 diff_get_color(ecbdata->color_diff, color),
706 reset, line, len);
707 return;
708 }
709 emit_add_line(reset, ecbdata, line, len);
710 }
712 static char *pprint_rename(const char *a, const char *b)
713 {
714 const char *old = a;
715 const char *new = b;
716 struct strbuf name = STRBUF_INIT;
717 int pfx_length, sfx_length;
718 int len_a = strlen(a);
719 int len_b = strlen(b);
720 int a_midlen, b_midlen;
721 int qlen_a = quote_c_style(a, NULL, NULL, 0);
722 int qlen_b = quote_c_style(b, NULL, NULL, 0);
724 if (qlen_a || qlen_b) {
725 quote_c_style(a, &name, NULL, 0);
726 strbuf_addstr(&name, " => ");
727 quote_c_style(b, &name, NULL, 0);
728 return strbuf_detach(&name, NULL);
729 }
731 /* Find common prefix */
732 pfx_length = 0;
733 while (*old && *new && *old == *new) {
734 if (*old == '/')
735 pfx_length = old - a + 1;
736 old++;
737 new++;
738 }
740 /* Find common suffix */
741 old = a + len_a;
742 new = b + len_b;
743 sfx_length = 0;
744 while (a <= old && b <= new && *old == *new) {
745 if (*old == '/')
746 sfx_length = len_a - (old - a);
747 old--;
748 new--;
749 }
751 /*
752 * pfx{mid-a => mid-b}sfx
753 * {pfx-a => pfx-b}sfx
754 * pfx{sfx-a => sfx-b}
755 * name-a => name-b
756 */
757 a_midlen = len_a - pfx_length - sfx_length;
758 b_midlen = len_b - pfx_length - sfx_length;
759 if (a_midlen < 0)
760 a_midlen = 0;
761 if (b_midlen < 0)
762 b_midlen = 0;
764 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
765 if (pfx_length + sfx_length) {
766 strbuf_add(&name, a, pfx_length);
767 strbuf_addch(&name, '{');
768 }
769 strbuf_add(&name, a + pfx_length, a_midlen);
770 strbuf_addstr(&name, " => ");
771 strbuf_add(&name, b + pfx_length, b_midlen);
772 if (pfx_length + sfx_length) {
773 strbuf_addch(&name, '}');
774 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
775 }
776 return strbuf_detach(&name, NULL);
777 }
779 struct diffstat_t {
780 int nr;
781 int alloc;
782 struct diffstat_file {
783 char *from_name;
784 char *name;
785 char *print_name;
786 unsigned is_unmerged:1;
787 unsigned is_binary:1;
788 unsigned is_renamed:1;
789 unsigned int added, deleted;
790 } **files;
791 };
793 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
794 const char *name_a,
795 const char *name_b)
796 {
797 struct diffstat_file *x;
798 x = xcalloc(sizeof (*x), 1);
799 if (diffstat->nr == diffstat->alloc) {
800 diffstat->alloc = alloc_nr(diffstat->alloc);
801 diffstat->files = xrealloc(diffstat->files,
802 diffstat->alloc * sizeof(x));
803 }
804 diffstat->files[diffstat->nr++] = x;
805 if (name_b) {
806 x->from_name = xstrdup(name_a);
807 x->name = xstrdup(name_b);
808 x->is_renamed = 1;
809 }
810 else {
811 x->from_name = NULL;
812 x->name = xstrdup(name_a);
813 }
814 return x;
815 }
817 static void diffstat_consume(void *priv, char *line, unsigned long len)
818 {
819 struct diffstat_t *diffstat = priv;
820 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
822 if (line[0] == '+')
823 x->added++;
824 else if (line[0] == '-')
825 x->deleted++;
826 }
828 const char mime_boundary_leader[] = "------------";
830 static int scale_linear(int it, int width, int max_change)
831 {
832 /*
833 * make sure that at least one '-' is printed if there were deletions,
834 * and likewise for '+'.
835 */
836 if (max_change < 2)
837 return it;
838 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
839 }
841 static void show_name(FILE *file,
842 const char *prefix, const char *name, int len)
843 {
844 fprintf(file, " %s%-*s |", prefix, len, name);
845 }
847 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
848 {
849 if (cnt <= 0)
850 return;
851 fprintf(file, "%s", set);
852 while (cnt--)
853 putc(ch, file);
854 fprintf(file, "%s", reset);
855 }
857 static void fill_print_name(struct diffstat_file *file)
858 {
859 char *pname;
861 if (file->print_name)
862 return;
864 if (!file->is_renamed) {
865 struct strbuf buf = STRBUF_INIT;
866 if (quote_c_style(file->name, &buf, NULL, 0)) {
867 pname = strbuf_detach(&buf, NULL);
868 } else {
869 pname = file->name;
870 strbuf_release(&buf);
871 }
872 } else {
873 pname = pprint_rename(file->from_name, file->name);
874 }
875 file->print_name = pname;
876 }
878 static void show_stats(struct diffstat_t *data, struct diff_options *options)
879 {
880 int i, len, add, del, adds = 0, dels = 0;
881 int max_change = 0, max_len = 0;
882 int total_files = data->nr;
883 int width, name_width;
884 const char *reset, *set, *add_c, *del_c;
886 if (data->nr == 0)
887 return;
889 width = options->stat_width ? options->stat_width : 80;
890 name_width = options->stat_name_width ? options->stat_name_width : 50;
892 /* Sanity: give at least 5 columns to the graph,
893 * but leave at least 10 columns for the name.
894 */
895 if (width < 25)
896 width = 25;
897 if (name_width < 10)
898 name_width = 10;
899 else if (width < name_width + 15)
900 name_width = width - 15;
902 /* Find the longest filename and max number of changes */
903 reset = diff_get_color_opt(options, DIFF_RESET);
904 set = diff_get_color_opt(options, DIFF_PLAIN);
905 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
906 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
908 for (i = 0; i < data->nr; i++) {
909 struct diffstat_file *file = data->files[i];
910 int change = file->added + file->deleted;
911 fill_print_name(file);
912 len = strlen(file->print_name);
913 if (max_len < len)
914 max_len = len;
916 if (file->is_binary || file->is_unmerged)
917 continue;
918 if (max_change < change)
919 max_change = change;
920 }
922 /* Compute the width of the graph part;
923 * 10 is for one blank at the beginning of the line plus
924 * " | count " between the name and the graph.
925 *
926 * From here on, name_width is the width of the name area,
927 * and width is the width of the graph area.
928 */
929 name_width = (name_width < max_len) ? name_width : max_len;
930 if (width < (name_width + 10) + max_change)
931 width = width - (name_width + 10);
932 else
933 width = max_change;
935 for (i = 0; i < data->nr; i++) {
936 const char *prefix = "";
937 char *name = data->files[i]->print_name;
938 int added = data->files[i]->added;
939 int deleted = data->files[i]->deleted;
940 int name_len;
942 /*
943 * "scale" the filename
944 */
945 len = name_width;
946 name_len = strlen(name);
947 if (name_width < name_len) {
948 char *slash;
949 prefix = "...";
950 len -= 3;
951 name += name_len - len;
952 slash = strchr(name, '/');
953 if (slash)
954 name = slash;
955 }
957 if (data->files[i]->is_binary) {
958 show_name(options->file, prefix, name, len);
959 fprintf(options->file, " Bin ");
960 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
961 fprintf(options->file, " -> ");
962 fprintf(options->file, "%s%d%s", add_c, added, reset);
963 fprintf(options->file, " bytes");
964 fprintf(options->file, "\n");
965 continue;
966 }
967 else if (data->files[i]->is_unmerged) {
968 show_name(options->file, prefix, name, len);
969 fprintf(options->file, " Unmerged\n");
970 continue;
971 }
972 else if (!data->files[i]->is_renamed &&
973 (added + deleted == 0)) {
974 total_files--;
975 continue;
976 }
978 /*
979 * scale the add/delete
980 */
981 add = added;
982 del = deleted;
983 adds += add;
984 dels += del;
986 if (width <= max_change) {
987 add = scale_linear(add, width, max_change);
988 del = scale_linear(del, width, max_change);
989 }
990 show_name(options->file, prefix, name, len);
991 fprintf(options->file, "%5d%s", added + deleted,
992 added + deleted ? " " : "");
993 show_graph(options->file, '+', add, add_c, reset);
994 show_graph(options->file, '-', del, del_c, reset);
995 fprintf(options->file, "\n");
996 }
997 fprintf(options->file,
998 " %d files changed, %d insertions(+), %d deletions(-)\n",
999 total_files, adds, dels);
1000 }
1002 static void show_shortstats(struct diffstat_t* data, struct diff_options *options)
1003 {
1004 int i, adds = 0, dels = 0, total_files = data->nr;
1006 if (data->nr == 0)
1007 return;
1009 for (i = 0; i < data->nr; i++) {
1010 if (!data->files[i]->is_binary &&
1011 !data->files[i]->is_unmerged) {
1012 int added = data->files[i]->added;
1013 int deleted= data->files[i]->deleted;
1014 if (!data->files[i]->is_renamed &&
1015 (added + deleted == 0)) {
1016 total_files--;
1017 } else {
1018 adds += added;
1019 dels += deleted;
1020 }
1021 }
1022 }
1023 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1024 total_files, adds, dels);
1025 }
1027 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1028 {
1029 int i;
1031 if (data->nr == 0)
1032 return;
1034 for (i = 0; i < data->nr; i++) {
1035 struct diffstat_file *file = data->files[i];
1037 if (file->is_binary)
1038 fprintf(options->file, "-\t-\t");
1039 else
1040 fprintf(options->file,
1041 "%d\t%d\t", file->added, file->deleted);
1042 if (options->line_termination) {
1043 fill_print_name(file);
1044 if (!file->is_renamed)
1045 write_name_quoted(file->name, options->file,
1046 options->line_termination);
1047 else {
1048 fputs(file->print_name, options->file);
1049 putc(options->line_termination, options->file);
1050 }
1051 } else {
1052 if (file->is_renamed) {
1053 putc('\0', options->file);
1054 write_name_quoted(file->from_name, options->file, '\0');
1055 }
1056 write_name_quoted(file->name, options->file, '\0');
1057 }
1058 }
1059 }
1061 struct dirstat_file {
1062 const char *name;
1063 unsigned long changed;
1064 };
1066 struct dirstat_dir {
1067 struct dirstat_file *files;
1068 int alloc, nr, percent, cumulative;
1069 };
1071 static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
1072 {
1073 unsigned long this_dir = 0;
1074 unsigned int sources = 0;
1076 while (dir->nr) {
1077 struct dirstat_file *f = dir->files;
1078 int namelen = strlen(f->name);
1079 unsigned long this;
1080 char *slash;
1082 if (namelen < baselen)
1083 break;
1084 if (memcmp(f->name, base, baselen))
1085 break;
1086 slash = strchr(f->name + baselen, '/');
1087 if (slash) {
1088 int newbaselen = slash + 1 - f->name;
1089 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
1090 sources++;
1091 } else {
1092 this = f->changed;
1093 dir->files++;
1094 dir->nr--;
1095 sources += 2;
1096 }
1097 this_dir += this;
1098 }
1100 /*
1101 * We don't report dirstat's for
1102 * - the top level
1103 * - or cases where everything came from a single directory
1104 * under this directory (sources == 1).
1105 */
1106 if (baselen && sources != 1) {
1107 int permille = this_dir * 1000 / changed;
1108 if (permille) {
1109 int percent = permille / 10;
1110 if (percent >= dir->percent) {
1111 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1112 if (!dir->cumulative)
1113 return 0;
1114 }
1115 }
1116 }
1117 return this_dir;
1118 }
1120 static int dirstat_compare(const void *_a, const void *_b)
1121 {
1122 const struct dirstat_file *a = _a;
1123 const struct dirstat_file *b = _b;
1124 return strcmp(a->name, b->name);
1125 }
1127 static void show_dirstat(struct diff_options *options)
1128 {
1129 int i;
1130 unsigned long changed;
1131 struct dirstat_dir dir;
1132 struct diff_queue_struct *q = &diff_queued_diff;
1134 dir.files = NULL;
1135 dir.alloc = 0;
1136 dir.nr = 0;
1137 dir.percent = options->dirstat_percent;
1138 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1140 changed = 0;
1141 for (i = 0; i < q->nr; i++) {
1142 struct diff_filepair *p = q->queue[i];
1143 const char *name;
1144 unsigned long copied, added, damage;
1146 name = p->one->path ? p->one->path : p->two->path;
1148 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1149 diff_populate_filespec(p->one, 0);
1150 diff_populate_filespec(p->two, 0);
1151 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1152 &copied, &added);
1153 diff_free_filespec_data(p->one);
1154 diff_free_filespec_data(p->two);
1155 } else if (DIFF_FILE_VALID(p->one)) {
1156 diff_populate_filespec(p->one, 1);
1157 copied = added = 0;
1158 diff_free_filespec_data(p->one);
1159 } else if (DIFF_FILE_VALID(p->two)) {
1160 diff_populate_filespec(p->two, 1);
1161 copied = 0;
1162 added = p->two->size;
1163 diff_free_filespec_data(p->two);
1164 } else
1165 continue;
1167 /*
1168 * Original minus copied is the removed material,
1169 * added is the new material. They are both damages
1170 * made to the preimage. In --dirstat-by-file mode, count
1171 * damaged files, not damaged lines. This is done by
1172 * counting only a single damaged line per file.
1173 */
1174 damage = (p->one->size - copied) + added;
1175 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1176 damage = 1;
1178 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1179 dir.files[dir.nr].name = name;
1180 dir.files[dir.nr].changed = damage;
1181 changed += damage;
1182 dir.nr++;
1183 }
1185 /* This can happen even with many files, if everything was renames */
1186 if (!changed)
1187 return;
1189 /* Show all directories with more than x% of the changes */
1190 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1191 gather_dirstat(options->file, &dir, changed, "", 0);
1192 }
1194 static void free_diffstat_info(struct diffstat_t *diffstat)
1195 {
1196 int i;
1197 for (i = 0; i < diffstat->nr; i++) {
1198 struct diffstat_file *f = diffstat->files[i];
1199 if (f->name != f->print_name)
1200 free(f->print_name);
1201 free(f->name);
1202 free(f->from_name);
1203 free(f);
1204 }
1205 free(diffstat->files);
1206 }
1208 struct checkdiff_t {
1209 const char *filename;
1210 int lineno;
1211 struct diff_options *o;
1212 unsigned ws_rule;
1213 unsigned status;
1214 int trailing_blanks_start;
1215 };
1217 static int is_conflict_marker(const char *line, unsigned long len)
1218 {
1219 char firstchar;
1220 int cnt;
1222 if (len < 8)
1223 return 0;
1224 firstchar = line[0];
1225 switch (firstchar) {
1226 case '=': case '>': case '<':
1227 break;
1228 default:
1229 return 0;
1230 }
1231 for (cnt = 1; cnt < 7; cnt++)
1232 if (line[cnt] != firstchar)
1233 return 0;
1234 /* line[0] thru line[6] are same as firstchar */
1235 if (firstchar == '=') {
1236 /* divider between ours and theirs? */
1237 if (len != 8 || line[7] != '\n')
1238 return 0;
1239 } else if (len < 8 || !isspace(line[7])) {
1240 /* not divider before ours nor after theirs */
1241 return 0;
1242 }
1243 return 1;
1244 }
1246 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1247 {
1248 struct checkdiff_t *data = priv;
1249 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1250 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1251 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1252 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1253 char *err;
1255 if (line[0] == '+') {
1256 unsigned bad;
1257 data->lineno++;
1258 if (!ws_blank_line(line + 1, len - 1, data->ws_rule))
1259 data->trailing_blanks_start = 0;
1260 else if (!data->trailing_blanks_start)
1261 data->trailing_blanks_start = data->lineno;
1262 if (is_conflict_marker(line + 1, len - 1)) {
1263 data->status |= 1;
1264 fprintf(data->o->file,
1265 "%s:%d: leftover conflict marker\n",
1266 data->filename, data->lineno);
1267 }
1268 bad = ws_check(line + 1, len - 1, data->ws_rule);
1269 if (!bad)
1270 return;
1271 data->status |= bad;
1272 err = whitespace_error_string(bad);
1273 fprintf(data->o->file, "%s:%d: %s.\n",
1274 data->filename, data->lineno, err);
1275 free(err);
1276 emit_line(data->o->file, set, reset, line, 1);
1277 ws_check_emit(line + 1, len - 1, data->ws_rule,
1278 data->o->file, set, reset, ws);
1279 } else if (line[0] == ' ') {
1280 data->lineno++;
1281 data->trailing_blanks_start = 0;
1282 } else if (line[0] == '@') {
1283 char *plus = strchr(line, '+');
1284 if (plus)
1285 data->lineno = strtol(plus, NULL, 10) - 1;
1286 else
1287 die("invalid diff");
1288 data->trailing_blanks_start = 0;
1289 }
1290 }
1292 static unsigned char *deflate_it(char *data,
1293 unsigned long size,
1294 unsigned long *result_size)
1295 {
1296 int bound;
1297 unsigned char *deflated;
1298 z_stream stream;
1300 memset(&stream, 0, sizeof(stream));
1301 deflateInit(&stream, zlib_compression_level);
1302 bound = deflateBound(&stream, size);
1303 deflated = xmalloc(bound);
1304 stream.next_out = deflated;
1305 stream.avail_out = bound;
1307 stream.next_in = (unsigned char *)data;
1308 stream.avail_in = size;
1309 while (deflate(&stream, Z_FINISH) == Z_OK)
1310 ; /* nothing */
1311 deflateEnd(&stream);
1312 *result_size = stream.total_out;
1313 return deflated;
1314 }
1316 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
1317 {
1318 void *cp;
1319 void *delta;
1320 void *deflated;
1321 void *data;
1322 unsigned long orig_size;
1323 unsigned long delta_size;
1324 unsigned long deflate_size;
1325 unsigned long data_size;
1327 /* We could do deflated delta, or we could do just deflated two,
1328 * whichever is smaller.
1329 */
1330 delta = NULL;
1331 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1332 if (one->size && two->size) {
1333 delta = diff_delta(one->ptr, one->size,
1334 two->ptr, two->size,
1335 &delta_size, deflate_size);
1336 if (delta) {
1337 void *to_free = delta;
1338 orig_size = delta_size;
1339 delta = deflate_it(delta, delta_size, &delta_size);
1340 free(to_free);
1341 }
1342 }
1344 if (delta && delta_size < deflate_size) {
1345 fprintf(file, "delta %lu\n", orig_size);
1346 free(deflated);
1347 data = delta;
1348 data_size = delta_size;
1349 }
1350 else {
1351 fprintf(file, "literal %lu\n", two->size);
1352 free(delta);
1353 data = deflated;
1354 data_size = deflate_size;
1355 }
1357 /* emit data encoded in base85 */
1358 cp = data;
1359 while (data_size) {
1360 int bytes = (52 < data_size) ? 52 : data_size;
1361 char line[70];
1362 data_size -= bytes;
1363 if (bytes <= 26)
1364 line[0] = bytes + 'A' - 1;
1365 else
1366 line[0] = bytes - 26 + 'a' - 1;
1367 encode_85(line + 1, cp, bytes);
1368 cp = (char *) cp + bytes;
1369 fputs(line, file);
1370 fputc('\n', file);
1371 }
1372 fprintf(file, "\n");
1373 free(data);
1374 }
1376 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
1377 {
1378 fprintf(file, "GIT binary patch\n");
1379 emit_binary_diff_body(file, one, two);
1380 emit_binary_diff_body(file, two, one);
1381 }
1383 static void diff_filespec_load_driver(struct diff_filespec *one)
1384 {
1385 if (!one->driver)
1386 one->driver = userdiff_find_by_path(one->path);
1387 if (!one->driver)
1388 one->driver = userdiff_find_by_name("default");
1389 }
1391 int diff_filespec_is_binary(struct diff_filespec *one)
1392 {
1393 if (one->is_binary == -1) {
1394 diff_filespec_load_driver(one);
1395 if (one->driver->binary != -1)
1396 one->is_binary = one->driver->binary;
1397 else {
1398 if (!one->data && DIFF_FILE_VALID(one))
1399 diff_populate_filespec(one, 0);
1400 if (one->data)
1401 one->is_binary = buffer_is_binary(one->data,
1402 one->size);
1403 if (one->is_binary == -1)
1404 one->is_binary = 0;
1405 }
1406 }
1407 return one->is_binary;
1408 }
1410 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1411 {
1412 diff_filespec_load_driver(one);
1413 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1414 }
1416 static const char *userdiff_word_regex(struct diff_filespec *one)
1417 {
1418 diff_filespec_load_driver(one);
1419 return one->driver->word_regex;
1420 }
1422 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1423 {
1424 if (!options->a_prefix)
1425 options->a_prefix = a;
1426 if (!options->b_prefix)
1427 options->b_prefix = b;
1428 }
1430 static const char *get_textconv(struct diff_filespec *one)
1431 {
1432 if (!DIFF_FILE_VALID(one))
1433 return NULL;
1434 if (!S_ISREG(one->mode))
1435 return NULL;
1436 diff_filespec_load_driver(one);
1437 return one->driver->textconv;
1438 }
1440 static void builtin_diff(const char *name_a,
1441 const char *name_b,
1442 struct diff_filespec *one,
1443 struct diff_filespec *two,
1444 const char *xfrm_msg,
1445 struct diff_options *o,
1446 int complete_rewrite)
1447 {
1448 mmfile_t mf1, mf2;
1449 const char *lbl[2];
1450 char *a_one, *b_two;
1451 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1452 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1453 const char *a_prefix, *b_prefix;
1454 const char *textconv_one = NULL, *textconv_two = NULL;
1456 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1457 textconv_one = get_textconv(one);
1458 textconv_two = get_textconv(two);
1459 }
1461 diff_set_mnemonic_prefix(o, "a/", "b/");
1462 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1463 a_prefix = o->b_prefix;
1464 b_prefix = o->a_prefix;
1465 } else {
1466 a_prefix = o->a_prefix;
1467 b_prefix = o->b_prefix;
1468 }
1470 /* Never use a non-valid filename anywhere if at all possible */
1471 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1472 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1474 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1475 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1476 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1477 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1478 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1479 if (lbl[0][0] == '/') {
1480 /* /dev/null */
1481 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
1482 if (xfrm_msg && xfrm_msg[0])
1483 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1484 }
1485 else if (lbl[1][0] == '/') {
1486 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1487 if (xfrm_msg && xfrm_msg[0])
1488 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1489 }
1490 else {
1491 if (one->mode != two->mode) {
1492 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1493 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
1494 }
1495 if (xfrm_msg && xfrm_msg[0])
1496 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1497 /*
1498 * we do not run diff between different kind
1499 * of objects.
1500 */
1501 if ((one->mode ^ two->mode) & S_IFMT)
1502 goto free_ab_and_return;
1503 if (complete_rewrite &&
1504 (textconv_one || !diff_filespec_is_binary(one)) &&
1505 (textconv_two || !diff_filespec_is_binary(two))) {
1506 emit_rewrite_diff(name_a, name_b, one, two,
1507 textconv_one, textconv_two, o);
1508 o->found_changes = 1;
1509 goto free_ab_and_return;
1510 }
1511 }
1513 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1514 die("unable to read files to diff");
1516 if (!DIFF_OPT_TST(o, TEXT) &&
1517 ( (diff_filespec_is_binary(one) && !textconv_one) ||
1518 (diff_filespec_is_binary(two) && !textconv_two) )) {
1519 /* Quite common confusing case */
1520 if (mf1.size == mf2.size &&
1521 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1522 goto free_ab_and_return;
1523 if (DIFF_OPT_TST(o, BINARY))
1524 emit_binary_diff(o->file, &mf1, &mf2);
1525 else
1526 fprintf(o->file, "Binary files %s and %s differ\n",
1527 lbl[0], lbl[1]);
1528 o->found_changes = 1;
1529 }
1530 else {
1531 /* Crazy xdl interfaces.. */
1532 const char *diffopts = getenv("GIT_DIFF_OPTS");
1533 xpparam_t xpp;
1534 xdemitconf_t xecfg;
1535 xdemitcb_t ecb;
1536 struct emit_callback ecbdata;
1537 const struct userdiff_funcname *pe;
1539 if (textconv_one) {
1540 size_t size;
1541 mf1.ptr = run_textconv(textconv_one, one, &size);
1542 if (!mf1.ptr)
1543 die("unable to read files to diff");
1544 mf1.size = size;
1545 }
1546 if (textconv_two) {
1547 size_t size;
1548 mf2.ptr = run_textconv(textconv_two, two, &size);
1549 if (!mf2.ptr)
1550 die("unable to read files to diff");
1551 mf2.size = size;
1552 }
1554 pe = diff_funcname_pattern(one);
1555 if (!pe)
1556 pe = diff_funcname_pattern(two);
1558 memset(&xpp, 0, sizeof(xpp));
1559 memset(&xecfg, 0, sizeof(xecfg));
1560 memset(&ecbdata, 0, sizeof(ecbdata));
1561 ecbdata.label_path = lbl;
1562 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1563 ecbdata.found_changesp = &o->found_changes;
1564 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1565 ecbdata.file = o->file;
1566 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1567 xecfg.ctxlen = o->context;
1568 xecfg.interhunkctxlen = o->interhunkcontext;
1569 xecfg.flags = XDL_EMIT_FUNCNAMES;
1570 if (pe)
1571 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1572 if (!diffopts)
1573 ;
1574 else if (!prefixcmp(diffopts, "--unified="))
1575 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1576 else if (!prefixcmp(diffopts, "-u"))
1577 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1578 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1579 ecbdata.diff_words =
1580 xcalloc(1, sizeof(struct diff_words_data));
1581 ecbdata.diff_words->file = o->file;
1582 if (!o->word_regex)
1583 o->word_regex = userdiff_word_regex(one);
1584 if (!o->word_regex)
1585 o->word_regex = userdiff_word_regex(two);
1586 if (!o->word_regex)
1587 o->word_regex = diff_word_regex_cfg;
1588 if (o->word_regex) {
1589 ecbdata.diff_words->word_regex = (regex_t *)
1590 xmalloc(sizeof(regex_t));
1591 if (regcomp(ecbdata.diff_words->word_regex,
1592 o->word_regex,
1593 REG_EXTENDED | REG_NEWLINE))
1594 die ("Invalid regular expression: %s",
1595 o->word_regex);
1596 }
1597 }
1598 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
1599 &xpp, &xecfg, &ecb);
1600 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1601 free_diff_words_data(&ecbdata);
1602 if (textconv_one)
1603 free(mf1.ptr);
1604 if (textconv_two)
1605 free(mf2.ptr);
1606 xdiff_clear_find_func(&xecfg);
1607 }
1609 free_ab_and_return:
1610 diff_free_filespec_data(one);
1611 diff_free_filespec_data(two);
1612 free(a_one);
1613 free(b_two);
1614 return;
1615 }
1617 static void builtin_diffstat(const char *name_a, const char *name_b,
1618 struct diff_filespec *one,
1619 struct diff_filespec *two,
1620 struct diffstat_t *diffstat,
1621 struct diff_options *o,
1622 int complete_rewrite)
1623 {
1624 mmfile_t mf1, mf2;
1625 struct diffstat_file *data;
1627 data = diffstat_add(diffstat, name_a, name_b);
1629 if (!one || !two) {
1630 data->is_unmerged = 1;
1631 return;
1632 }
1633 if (complete_rewrite) {
1634 diff_populate_filespec(one, 0);
1635 diff_populate_filespec(two, 0);
1636 data->deleted = count_lines(one->data, one->size);
1637 data->added = count_lines(two->data, two->size);
1638 goto free_and_return;
1639 }
1640 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1641 die("unable to read files to diff");
1643 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1644 data->is_binary = 1;
1645 data->added = mf2.size;
1646 data->deleted = mf1.size;
1647 } else {
1648 /* Crazy xdl interfaces.. */
1649 xpparam_t xpp;
1650 xdemitconf_t xecfg;
1651 xdemitcb_t ecb;
1653 memset(&xpp, 0, sizeof(xpp));
1654 memset(&xecfg, 0, sizeof(xecfg));
1655 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1656 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
1657 &xpp, &xecfg, &ecb);
1658 }
1660 free_and_return:
1661 diff_free_filespec_data(one);
1662 diff_free_filespec_data(two);
1663 }
1665 static void builtin_checkdiff(const char *name_a, const char *name_b,
1666 const char *attr_path,
1667 struct diff_filespec *one,
1668 struct diff_filespec *two,
1669 struct diff_options *o)
1670 {
1671 mmfile_t mf1, mf2;
1672 struct checkdiff_t data;
1674 if (!two)
1675 return;
1677 memset(&data, 0, sizeof(data));
1678 data.filename = name_b ? name_b : name_a;
1679 data.lineno = 0;
1680 data.o = o;
1681 data.ws_rule = whitespace_rule(attr_path);
1683 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1684 die("unable to read files to diff");
1686 /*
1687 * All the other codepaths check both sides, but not checking
1688 * the "old" side here is deliberate. We are checking the newly
1689 * introduced changes, and as long as the "new" side is text, we
1690 * can and should check what it introduces.
1691 */
1692 if (diff_filespec_is_binary(two))
1693 goto free_and_return;
1694 else {
1695 /* Crazy xdl interfaces.. */
1696 xpparam_t xpp;
1697 xdemitconf_t xecfg;
1698 xdemitcb_t ecb;
1700 memset(&xpp, 0, sizeof(xpp));
1701 memset(&xecfg, 0, sizeof(xecfg));
1702 xecfg.ctxlen = 1; /* at least one context line */
1703 xpp.flags = XDF_NEED_MINIMAL;
1704 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
1705 &xpp, &xecfg, &ecb);
1707 if ((data.ws_rule & WS_TRAILING_SPACE) &&
1708 data.trailing_blanks_start) {
1709 fprintf(o->file, "%s:%d: ends with blank lines.\n",
1710 data.filename, data.trailing_blanks_start);
1711 data.status = 1; /* report errors */
1712 }
1713 }
1714 free_and_return:
1715 diff_free_filespec_data(one);
1716 diff_free_filespec_data(two);
1717 if (data.status)
1718 DIFF_OPT_SET(o, CHECK_FAILED);
1719 }
1721 struct diff_filespec *alloc_filespec(const char *path)
1722 {
1723 int namelen = strlen(path);
1724 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1726 memset(spec, 0, sizeof(*spec));
1727 spec->path = (char *)(spec + 1);
1728 memcpy(spec->path, path, namelen+1);
1729 spec->count = 1;
1730 spec->is_binary = -1;
1731 return spec;
1732 }
1734 void free_filespec(struct diff_filespec *spec)
1735 {
1736 if (!--spec->count) {
1737 diff_free_filespec_data(spec);
1738 free(spec);
1739 }
1740 }
1742 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1743 unsigned short mode)
1744 {
1745 if (mode) {
1746 spec->mode = canon_mode(mode);
1747 hashcpy(spec->sha1, sha1);
1748 spec->sha1_valid = !is_null_sha1(sha1);
1749 }
1750 }
1752 /*
1753 * Given a name and sha1 pair, if the index tells us the file in
1754 * the work tree has that object contents, return true, so that
1755 * prepare_temp_file() does not have to inflate and extract.
1756 */
1757 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1758 {
1759 struct cache_entry *ce;
1760 struct stat st;
1761 int pos, len;
1763 /*
1764 * We do not read the cache ourselves here, because the
1765 * benchmark with my previous version that always reads cache
1766 * shows that it makes things worse for diff-tree comparing
1767 * two linux-2.6 kernel trees in an already checked out work
1768 * tree. This is because most diff-tree comparisons deal with
1769 * only a small number of files, while reading the cache is
1770 * expensive for a large project, and its cost outweighs the
1771 * savings we get by not inflating the object to a temporary
1772 * file. Practically, this code only helps when we are used
1773 * by diff-cache --cached, which does read the cache before
1774 * calling us.
1775 */
1776 if (!active_cache)
1777 return 0;
1779 /* We want to avoid the working directory if our caller
1780 * doesn't need the data in a normal file, this system
1781 * is rather slow with its stat/open/mmap/close syscalls,
1782 * and the object is contained in a pack file. The pack
1783 * is probably already open and will be faster to obtain
1784 * the data through than the working directory. Loose
1785 * objects however would tend to be slower as they need
1786 * to be individually opened and inflated.
1787 */
1788 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
1789 return 0;
1791 len = strlen(name);
1792 pos = cache_name_pos(name, len);
1793 if (pos < 0)
1794 return 0;
1795 ce = active_cache[pos];
1797 /*
1798 * This is not the sha1 we are looking for, or
1799 * unreusable because it is not a regular file.
1800 */
1801 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1802 return 0;
1804 /*
1805 * If ce is marked as "assume unchanged", there is no
1806 * guarantee that work tree matches what we are looking for.
1807 */
1808 if (ce->ce_flags & CE_VALID)
1809 return 0;
1811 /*
1812 * If ce matches the file in the work tree, we can reuse it.
1813 */
1814 if (ce_uptodate(ce) ||
1815 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1816 return 1;
1818 return 0;
1819 }
1821 static int populate_from_stdin(struct diff_filespec *s)
1822 {
1823 struct strbuf buf = STRBUF_INIT;
1824 size_t size = 0;
1826 if (strbuf_read(&buf, 0, 0) < 0)
1827 return error("error while reading from stdin %s",
1828 strerror(errno));
1830 s->should_munmap = 0;
1831 s->data = strbuf_detach(&buf, &size);
1832 s->size = size;
1833 s->should_free = 1;
1834 return 0;
1835 }
1837 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1838 {
1839 int len;
1840 char *data = xmalloc(100);
1841 len = snprintf(data, 100,
1842 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1843 s->data = data;
1844 s->size = len;
1845 s->should_free = 1;
1846 if (size_only) {
1847 s->data = NULL;
1848 free(data);
1849 }
1850 return 0;
1851 }
1853 /*
1854 * While doing rename detection and pickaxe operation, we may need to
1855 * grab the data for the blob (or file) for our own in-core comparison.
1856 * diff_filespec has data and size fields for this purpose.
1857 */
1858 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1859 {
1860 int err = 0;
1861 if (!DIFF_FILE_VALID(s))
1862 die("internal error: asking to populate invalid file.");
1863 if (S_ISDIR(s->mode))
1864 return -1;
1866 if (s->data)
1867 return 0;
1869 if (size_only && 0 < s->size)
1870 return 0;
1872 if (S_ISGITLINK(s->mode))
1873 return diff_populate_gitlink(s, size_only);
1875 if (!s->sha1_valid ||
1876 reuse_worktree_file(s->path, s->sha1, 0)) {
1877 struct strbuf buf = STRBUF_INIT;
1878 struct stat st;
1879 int fd;
1881 if (!strcmp(s->path, "-"))
1882 return populate_from_stdin(s);
1884 if (lstat(s->path, &st) < 0) {
1885 if (errno == ENOENT) {
1886 err_empty:
1887 err = -1;
1888 empty:
1889 s->data = (char *)"";
1890 s->size = 0;
1891 return err;
1892 }
1893 }
1894 s->size = xsize_t(st.st_size);
1895 if (!s->size)
1896 goto empty;
1897 if (S_ISLNK(st.st_mode)) {
1898 struct strbuf sb = STRBUF_INIT;
1900 if (strbuf_readlink(&sb, s->path, s->size))
1901 goto err_empty;
1902 s->size = sb.len;
1903 s->data = strbuf_detach(&sb, NULL);
1904 s->should_free = 1;
1905 return 0;
1906 }
1907 if (size_only)
1908 return 0;
1909 fd = open(s->path, O_RDONLY);
1910 if (fd < 0)
1911 goto err_empty;
1912 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1913 close(fd);
1914 s->should_munmap = 1;
1916 /*
1917 * Convert from working tree format to canonical git format
1918 */
1919 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
1920 size_t size = 0;
1921 munmap(s->data, s->size);
1922 s->should_munmap = 0;
1923 s->data = strbuf_detach(&buf, &size);
1924 s->size = size;
1925 s->should_free = 1;
1926 }
1927 }
1928 else {
1929 enum object_type type;
1930 if (size_only)
1931 type = sha1_object_info(s->sha1, &s->size);
1932 else {
1933 s->data = read_sha1_file(s->sha1, &type, &s->size);
1934 s->should_free = 1;
1935 }
1936 }
1937 return 0;
1938 }
1940 void diff_free_filespec_blob(struct diff_filespec *s)
1941 {
1942 if (s->should_free)
1943 free(s->data);
1944 else if (s->should_munmap)
1945 munmap(s->data, s->size);
1947 if (s->should_free || s->should_munmap) {
1948 s->should_free = s->should_munmap = 0;
1949 s->data = NULL;
1950 }
1951 }
1953 void diff_free_filespec_data(struct diff_filespec *s)
1954 {
1955 diff_free_filespec_blob(s);
1956 free(s->cnt_data);
1957 s->cnt_data = NULL;
1958 }
1960 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
1961 void *blob,
1962 unsigned long size,
1963 const unsigned char *sha1,
1964 int mode)
1965 {
1966 int fd;
1967 struct strbuf buf = STRBUF_INIT;
1968 struct strbuf template = STRBUF_INIT;
1969 char *path_dup = xstrdup(path);
1970 const char *base = basename(path_dup);
1972 /* Generate "XXXXXX_basename.ext" */
1973 strbuf_addstr(&template, "XXXXXX_");
1974 strbuf_addstr(&template, base);
1976 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
1977 strlen(base) + 1);
1978 if (fd < 0)
1979 die_errno("unable to create temp-file");
1980 if (convert_to_working_tree(path,
1981 (const char *)blob, (size_t)size, &buf)) {
1982 blob = buf.buf;
1983 size = buf.len;
1984 }
1985 if (write_in_full(fd, blob, size) != size)
1986 die_errno("unable to write temp-file");
1987 close(fd);
1988 temp->name = temp->tmp_path;
1989 strcpy(temp->hex, sha1_to_hex(sha1));
1990 temp->hex[40] = 0;
1991 sprintf(temp->mode, "%06o", mode);
1992 strbuf_release(&buf);
1993 strbuf_release(&template);
1994 free(path_dup);
1995 }
1997 static struct diff_tempfile *prepare_temp_file(const char *name,
1998 struct diff_filespec *one)
1999 {
2000 struct diff_tempfile *temp = claim_diff_tempfile();
2002 if (!DIFF_FILE_VALID(one)) {
2003 not_a_valid_file:
2004 /* A '-' entry produces this for file-2, and
2005 * a '+' entry produces this for file-1.
2006 */
2007 temp->name = "/dev/null";
2008 strcpy(temp->hex, ".");
2009 strcpy(temp->mode, ".");
2010 return temp;
2011 }
2013 if (!remove_tempfile_installed) {
2014 atexit(remove_tempfile);
2015 sigchain_push_common(remove_tempfile_on_signal);
2016 remove_tempfile_installed = 1;
2017 }
2019 if (!one->sha1_valid ||
2020 reuse_worktree_file(name, one->sha1, 1)) {
2021 struct stat st;
2022 if (lstat(name, &st) < 0) {
2023 if (errno == ENOENT)
2024 goto not_a_valid_file;
2025 die_errno("stat(%s)", name);
2026 }
2027 if (S_ISLNK(st.st_mode)) {
2028 struct strbuf sb = STRBUF_INIT;
2029 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2030 die_errno("readlink(%s)", name);
2031 prep_temp_blob(name, temp, sb.buf, sb.len,
2032 (one->sha1_valid ?
2033 one->sha1 : null_sha1),
2034 (one->sha1_valid ?
2035 one->mode : S_IFLNK));
2036 strbuf_release(&sb);
2037 }
2038 else {
2039 /* we can borrow from the file in the work tree */
2040 temp->name = name;
2041 if (!one->sha1_valid)
2042 strcpy(temp->hex, sha1_to_hex(null_sha1));
2043 else
2044 strcpy(temp->hex, sha1_to_hex(one->sha1));
2045 /* Even though we may sometimes borrow the
2046 * contents from the work tree, we always want
2047 * one->mode. mode is trustworthy even when
2048 * !(one->sha1_valid), as long as
2049 * DIFF_FILE_VALID(one).
2050 */
2051 sprintf(temp->mode, "%06o", one->mode);
2052 }
2053 return temp;
2054 }
2055 else {
2056 if (diff_populate_filespec(one, 0))
2057 die("cannot read data blob for %s", one->path);
2058 prep_temp_blob(name, temp, one->data, one->size,
2059 one->sha1, one->mode);
2060 }
2061 return temp;
2062 }
2064 /* An external diff command takes:
2065 *
2066 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2067 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2068 *
2069 */
2070 static void run_external_diff(const char *pgm,
2071 const char *name,
2072 const char *other,
2073 struct diff_filespec *one,
2074 struct diff_filespec *two,
2075 const char *xfrm_msg,
2076 int complete_rewrite)
2077 {
2078 const char *spawn_arg[10];
2079 int retval;
2080 const char **arg = &spawn_arg[0];
2082 if (one && two) {
2083 struct diff_tempfile *temp_one, *temp_two;
2084 const char *othername = (other ? other : name);
2085 temp_one = prepare_temp_file(name, one);
2086 temp_two = prepare_temp_file(othername, two);
2087 *arg++ = pgm;
2088 *arg++ = name;
2089 *arg++ = temp_one->name;
2090 *arg++ = temp_one->hex;
2091 *arg++ = temp_one->mode;
2092 *arg++ = temp_two->name;
2093 *arg++ = temp_two->hex;
2094 *arg++ = temp_two->mode;
2095 if (other) {
2096 *arg++ = other;
2097 *arg++ = xfrm_msg;
2098 }
2099 } else {
2100 *arg++ = pgm;
2101 *arg++ = name;
2102 }
2103 *arg = NULL;
2104 fflush(NULL);
2105 retval = run_command_v_opt(spawn_arg, 0);
2106 remove_tempfile();
2107 if (retval) {
2108 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2109 exit(1);
2110 }
2111 }
2113 static int similarity_index(struct diff_filepair *p)
2114 {
2115 return p->score * 100 / MAX_SCORE;
2116 }
2118 static void fill_metainfo(struct strbuf *msg,
2119 const char *name,
2120 const char *other,
2121 struct diff_filespec *one,
2122 struct diff_filespec *two,
2123 struct diff_options *o,
2124 struct diff_filepair *p)
2125 {
2126 strbuf_init(msg, PATH_MAX * 2 + 300);
2127 switch (p->status) {
2128 case DIFF_STATUS_COPIED:
2129 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2130 strbuf_addstr(msg, "\ncopy from ");
2131 quote_c_style(name, msg, NULL, 0);
2132 strbuf_addstr(msg, "\ncopy to ");
2133 quote_c_style(other, msg, NULL, 0);
2134 strbuf_addch(msg, '\n');
2135 break;
2136 case DIFF_STATUS_RENAMED:
2137 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2138 strbuf_addstr(msg, "\nrename from ");
2139 quote_c_style(name, msg, NULL, 0);
2140 strbuf_addstr(msg, "\nrename to ");
2141 quote_c_style(other, msg, NULL, 0);
2142 strbuf_addch(msg, '\n');
2143 break;
2144 case DIFF_STATUS_MODIFIED:
2145 if (p->score) {
2146 strbuf_addf(msg, "dissimilarity index %d%%\n",
2147 similarity_index(p));
2148 break;
2149 }
2150 /* fallthru */
2151 default:
2152 /* nothing */
2153 ;
2154 }
2155 if (one && two && hashcmp(one->sha1, two->sha1)) {
2156 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2158 if (DIFF_OPT_TST(o, BINARY)) {
2159 mmfile_t mf;
2160 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2161 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2162 abbrev = 40;
2163 }
2164 strbuf_addf(msg, "index %.*s..%.*s",
2165 abbrev, sha1_to_hex(one->sha1),
2166 abbrev, sha1_to_hex(two->sha1));
2167 if (one->mode == two->mode)
2168 strbuf_addf(msg, " %06o", one->mode);
2169 strbuf_addch(msg, '\n');
2170 }
2171 if (msg->len)
2172 strbuf_setlen(msg, msg->len - 1);
2173 }
2175 static void run_diff_cmd(const char *pgm,
2176 const char *name,
2177 const char *other,
2178 const char *attr_path,
2179 struct diff_filespec *one,
2180 struct diff_filespec *two,
2181 struct strbuf *msg,
2182 struct diff_options *o,
2183 struct diff_filepair *p)
2184 {
2185 const char *xfrm_msg = NULL;
2186 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2188 if (msg) {
2189 fill_metainfo(msg, name, other, one, two, o, p);
2190 xfrm_msg = msg->len ? msg->buf : NULL;
2191 }
2193 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2194 pgm = NULL;
2195 else {
2196 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2197 if (drv && drv->external)
2198 pgm = drv->external;
2199 }
2201 if (pgm) {
2202 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2203 complete_rewrite);
2204 return;
2205 }
2206 if (one && two)
2207 builtin_diff(name, other ? other : name,
2208 one, two, xfrm_msg, o, complete_rewrite);
2209 else
2210 fprintf(o->file, "* Unmerged path %s\n", name);
2211 }
2213 static void diff_fill_sha1_info(struct diff_filespec *one)
2214 {
2215 if (DIFF_FILE_VALID(one)) {
2216 if (!one->sha1_valid) {
2217 struct stat st;
2218 if (!strcmp(one->path, "-")) {
2219 hashcpy(one->sha1, null_sha1);
2220 return;
2221 }
2222 if (lstat(one->path, &st) < 0)
2223 die_errno("stat '%s'", one->path);
2224 if (index_path(one->sha1, one->path, &st, 0))
2225 die("cannot hash %s", one->path);
2226 }
2227 }
2228 else
2229 hashclr(one->sha1);
2230 }
2232 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2233 {
2234 /* Strip the prefix but do not molest /dev/null and absolute paths */
2235 if (*namep && **namep != '/')
2236 *namep += prefix_length;
2237 if (*otherp && **otherp != '/')
2238 *otherp += prefix_length;
2239 }
2241 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2242 {
2243 const char *pgm = external_diff();
2244 struct strbuf msg;
2245 struct diff_filespec *one = p->one;
2246 struct diff_filespec *two = p->two;
2247 const char *name;
2248 const char *other;
2249 const char *attr_path;
2251 name = p->one->path;
2252 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2253 attr_path = name;
2254 if (o->prefix_length)
2255 strip_prefix(o->prefix_length, &name, &other);
2257 if (DIFF_PAIR_UNMERGED(p)) {
2258 run_diff_cmd(pgm, name, NULL, attr_path,
2259 NULL, NULL, NULL, o, p);
2260 return;
2261 }
2263 diff_fill_sha1_info(one);
2264 diff_fill_sha1_info(two);
2266 if (!pgm &&
2267 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2268 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2269 /*
2270 * a filepair that changes between file and symlink
2271 * needs to be split into deletion and creation.
2272 */
2273 struct diff_filespec *null = alloc_filespec(two->path);
2274 run_diff_cmd(NULL, name, other, attr_path,
2275 one, null, &msg, o, p);
2276 free(null);
2277 strbuf_release(&msg);
2279 null = alloc_filespec(one->path);
2280 run_diff_cmd(NULL, name, other, attr_path,
2281 null, two, &msg, o, p);
2282 free(null);
2283 }
2284 else
2285 run_diff_cmd(pgm, name, other, attr_path,
2286 one, two, &msg, o, p);
2288 strbuf_release(&msg);
2289 }
2291 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2292 struct diffstat_t *diffstat)
2293 {
2294 const char *name;
2295 const char *other;
2296 int complete_rewrite = 0;
2298 if (DIFF_PAIR_UNMERGED(p)) {
2299 /* unmerged */
2300 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2301 return;
2302 }
2304 name = p->one->path;
2305 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2307 if (o->prefix_length)
2308 strip_prefix(o->prefix_length, &name, &other);
2310 diff_fill_sha1_info(p->one);
2311 diff_fill_sha1_info(p->two);
2313 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2314 complete_rewrite = 1;
2315 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2316 }
2318 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2319 {
2320 const char *name;
2321 const char *other;
2322 const char *attr_path;
2324 if (DIFF_PAIR_UNMERGED(p)) {
2325 /* unmerged */
2326 return;
2327 }
2329 name = p->one->path;
2330 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2331 attr_path = other ? other : name;
2333 if (o->prefix_length)
2334 strip_prefix(o->prefix_length, &name, &other);
2336 diff_fill_sha1_info(p->one);
2337 diff_fill_sha1_info(p->two);
2339 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2340 }
2342 void diff_setup(struct diff_options *options)
2343 {
2344 memset(options, 0, sizeof(*options));
2346 options->file = stdout;
2348 options->line_termination = '\n';
2349 options->break_opt = -1;
2350 options->rename_limit = -1;
2351 options->dirstat_percent = 3;
2352 options->context = 3;
2354 options->change = diff_change;
2355 options->add_remove = diff_addremove;
2356 if (diff_use_color_default > 0)
2357 DIFF_OPT_SET(options, COLOR_DIFF);
2358 options->detect_rename = diff_detect_rename_default;
2360 if (!diff_mnemonic_prefix) {
2361 options->a_prefix = "a/";
2362 options->b_prefix = "b/";
2363 }
2364 }
2366 int diff_setup_done(struct diff_options *options)
2367 {
2368 int count = 0;
2370 if (options->output_format & DIFF_FORMAT_NAME)
2371 count++;
2372 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2373 count++;
2374 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2375 count++;
2376 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2377 count++;
2378 if (count > 1)
2379 die("--name-only, --name-status, --check and -s are mutually exclusive");
2381 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2382 options->detect_rename = DIFF_DETECT_COPY;
2384 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2385 options->prefix = NULL;
2386 if (options->prefix)
2387 options->prefix_length = strlen(options->prefix);
2388 else
2389 options->prefix_length = 0;
2391 if (options->output_format & (DIFF_FORMAT_NAME |
2392 DIFF_FORMAT_NAME_STATUS |
2393 DIFF_FORMAT_CHECKDIFF |
2394 DIFF_FORMAT_NO_OUTPUT))
2395 options->output_format &= ~(DIFF_FORMAT_RAW |
2396 DIFF_FORMAT_NUMSTAT |
2397 DIFF_FORMAT_DIFFSTAT |
2398 DIFF_FORMAT_SHORTSTAT |
2399 DIFF_FORMAT_DIRSTAT |
2400 DIFF_FORMAT_SUMMARY |
2401 DIFF_FORMAT_PATCH);
2403 /*
2404 * These cases always need recursive; we do not drop caller-supplied
2405 * recursive bits for other formats here.
2406 */
2407 if (options->output_format & (DIFF_FORMAT_PATCH |
2408 DIFF_FORMAT_NUMSTAT |
2409 DIFF_FORMAT_DIFFSTAT |
2410 DIFF_FORMAT_SHORTSTAT |
2411 DIFF_FORMAT_DIRSTAT |
2412 DIFF_FORMAT_SUMMARY |
2413 DIFF_FORMAT_CHECKDIFF))
2414 DIFF_OPT_SET(options, RECURSIVE);
2415 /*
2416 * Also pickaxe would not work very well if you do not say recursive
2417 */
2418 if (options->pickaxe)
2419 DIFF_OPT_SET(options, RECURSIVE);
2421 if (options->detect_rename && options->rename_limit < 0)
2422 options->rename_limit = diff_rename_limit_default;
2423 if (options->setup & DIFF_SETUP_USE_CACHE) {
2424 if (!active_cache)
2425 /* read-cache does not die even when it fails
2426 * so it is safe for us to do this here. Also
2427 * it does not smudge active_cache or active_nr
2428 * when it fails, so we do not have to worry about
2429 * cleaning it up ourselves either.
2430 */
2431 read_cache();
2432 }
2433 if (options->abbrev <= 0 || 40 < options->abbrev)
2434 options->abbrev = 40; /* full */
2436 /*
2437 * It does not make sense to show the first hit we happened
2438 * to have found. It does not make sense not to return with
2439 * exit code in such a case either.
2440 */
2441 if (DIFF_OPT_TST(options, QUIET)) {
2442 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2443 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2444 }
2446 return 0;
2447 }
2449 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2450 {
2451 char c, *eq;
2452 int len;
2454 if (*arg != '-')
2455 return 0;
2456 c = *++arg;
2457 if (!c)
2458 return 0;
2459 if (c == arg_short) {
2460 c = *++arg;
2461 if (!c)
2462 return 1;
2463 if (val && isdigit(c)) {
2464 char *end;
2465 int n = strtoul(arg, &end, 10);
2466 if (*end)
2467 return 0;
2468 *val = n;
2469 return 1;
2470 }
2471 return 0;
2472 }
2473 if (c != '-')
2474 return 0;
2475 arg++;
2476 eq = strchr(arg, '=');
2477 if (eq)
2478 len = eq - arg;
2479 else
2480 len = strlen(arg);
2481 if (!len || strncmp(arg, arg_long, len))
2482 return 0;
2483 if (eq) {
2484 int n;
2485 char *end;
2486 if (!isdigit(*++eq))
2487 return 0;
2488 n = strtoul(eq, &end, 10);
2489 if (*end)
2490 return 0;
2491 *val = n;
2492 }
2493 return 1;
2494 }
2496 static int diff_scoreopt_parse(const char *opt);
2498 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2499 {
2500 const char *arg = av[0];
2502 /* Output format options */
2503 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2504 options->output_format |= DIFF_FORMAT_PATCH;
2505 else if (opt_arg(arg, 'U', "unified", &options->context))
2506 options->output_format |= DIFF_FORMAT_PATCH;
2507 else if (!strcmp(arg, "--raw"))
2508 options->output_format |= DIFF_FORMAT_RAW;
2509 else if (!strcmp(arg, "--patch-with-raw"))
2510 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2511 else if (!strcmp(arg, "--numstat"))
2512 options->output_format |= DIFF_FORMAT_NUMSTAT;
2513 else if (!strcmp(arg, "--shortstat"))
2514 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2515 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2516 options->output_format |= DIFF_FORMAT_DIRSTAT;
2517 else if (!strcmp(arg, "--cumulative")) {
2518 options->output_format |= DIFF_FORMAT_DIRSTAT;
2519 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
2520 } else if (opt_arg(arg, 0, "dirstat-by-file",
2521 &options->dirstat_percent)) {
2522 options->output_format |= DIFF_FORMAT_DIRSTAT;
2523 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
2524 }
2525 else if (!strcmp(arg, "--check"))
2526 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2527 else if (!strcmp(arg, "--summary"))
2528 options->output_format |= DIFF_FORMAT_SUMMARY;
2529 else if (!strcmp(arg, "--patch-with-stat"))
2530 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2531 else if (!strcmp(arg, "--name-only"))
2532 options->output_format |= DIFF_FORMAT_NAME;
2533 else if (!strcmp(arg, "--name-status"))
2534 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2535 else if (!strcmp(arg, "-s"))
2536 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2537 else if (!prefixcmp(arg, "--stat")) {
2538 char *end;
2539 int width = options->stat_width;
2540 int name_width = options->stat_name_width;
2541 arg += 6;
2542 end = (char *)arg;
2544 switch (*arg) {
2545 case '-':
2546 if (!prefixcmp(arg, "-width="))
2547 width = strtoul(arg + 7, &end, 10);
2548 else if (!prefixcmp(arg, "-name-width="))
2549 name_width = strtoul(arg + 12, &end, 10);
2550 break;
2551 case '=':
2552 width = strtoul(arg+1, &end, 10);
2553 if (*end == ',')
2554 name_width = strtoul(end+1, &end, 10);
2555 }
2557 /* Important! This checks all the error cases! */
2558 if (*end)
2559 return 0;
2560 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2561 options->stat_name_width = name_width;
2562 options->stat_width = width;
2563 }
2565 /* renames options */
2566 else if (!prefixcmp(arg, "-B")) {
2567 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2568 return -1;
2569 }
2570 else if (!prefixcmp(arg, "-M")) {
2571 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2572 return -1;
2573 options->detect_rename = DIFF_DETECT_RENAME;
2574 }
2575 else if (!prefixcmp(arg, "-C")) {
2576 if (options->detect_rename == DIFF_DETECT_COPY)
2577 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2578 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2579 return -1;
2580 options->detect_rename = DIFF_DETECT_COPY;
2581 }
2582 else if (!strcmp(arg, "--no-renames"))
2583 options->detect_rename = 0;
2584 else if (!strcmp(arg, "--relative"))
2585 DIFF_OPT_SET(options, RELATIVE_NAME);
2586 else if (!prefixcmp(arg, "--relative=")) {
2587 DIFF_OPT_SET(options, RELATIVE_NAME);
2588 options->prefix = arg + 11;
2589 }
2591 /* xdiff options */
2592 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2593 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
2594 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2595 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
2596 else if (!strcmp(arg, "--ignore-space-at-eol"))
2597 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
2598 else if (!strcmp(arg, "--patience"))
2599 DIFF_XDL_SET(options, PATIENCE_DIFF);
2601 /* flags options */
2602 else if (!strcmp(arg, "--binary")) {
2603 options->output_format |= DIFF_FORMAT_PATCH;
2604 DIFF_OPT_SET(options, BINARY);
2605 }
2606 else if (!strcmp(arg, "--full-index"))
2607 DIFF_OPT_SET(options, FULL_INDEX);
2608 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2609 DIFF_OPT_SET(options, TEXT);
2610 else if (!strcmp(arg, "-R"))
2611 DIFF_OPT_SET(options, REVERSE_DIFF);
2612 else if (!strcmp(arg, "--find-copies-harder"))
2613 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2614 else if (!strcmp(arg, "--follow"))
2615 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2616 else if (!strcmp(arg, "--color"))
2617 DIFF_OPT_SET(options, COLOR_DIFF);
2618 else if (!strcmp(arg, "--no-color"))
2619 DIFF_OPT_CLR(options, COLOR_DIFF);
2620 else if (!strcmp(arg, "--color-words")) {
2621 DIFF_OPT_SET(options, COLOR_DIFF);
2622 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2623 }
2624 else if (!prefixcmp(arg, "--color-words=")) {
2625 DIFF_OPT_SET(options, COLOR_DIFF);
2626 DIFF_OPT_SET(options, COLOR_DIFF_WORDS);
2627 options->word_regex = arg + 14;
2628 }
2629 else if (!strcmp(arg, "--exit-code"))
2630 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2631 else if (!strcmp(arg, "--quiet"))
2632 DIFF_OPT_SET(options, QUIET);
2633 else if (!strcmp(arg, "--ext-diff"))
2634 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2635 else if (!strcmp(arg, "--no-ext-diff"))
2636 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2637 else if (!strcmp(arg, "--textconv"))
2638 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
2639 else if (!strcmp(arg, "--no-textconv"))
2640 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
2641 else if (!strcmp(arg, "--ignore-submodules"))
2642 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2644 /* misc options */
2645 else if (!strcmp(arg, "-z"))
2646 options->line_termination = 0;
2647 else if (!prefixcmp(arg, "-l"))
2648 options->rename_limit = strtoul(arg+2, NULL, 10);
2649 else if (!prefixcmp(arg, "-S"))
2650 options->pickaxe = arg + 2;
2651 else if (!strcmp(arg, "--pickaxe-all"))
2652 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2653 else if (!strcmp(arg, "--pickaxe-regex"))
2654 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2655 else if (!prefixcmp(arg, "-O"))
2656 options->orderfile = arg + 2;
2657 else if (!prefixcmp(arg, "--diff-filter="))
2658 options->filter = arg + 14;
2659 else if (!strcmp(arg, "--abbrev"))
2660 options->abbrev = DEFAULT_ABBREV;
2661 else if (!prefixcmp(arg, "--abbrev=")) {
2662 options->abbrev = strtoul(arg + 9, NULL, 10);
2663 if (options->abbrev < MINIMUM_ABBREV)
2664 options->abbrev = MINIMUM_ABBREV;
2665 else if (40 < options->abbrev)
2666 options->abbrev = 40;
2667 }
2668 else if (!prefixcmp(arg, "--src-prefix="))
2669 options->a_prefix = arg + 13;
2670 else if (!prefixcmp(arg, "--dst-prefix="))
2671 options->b_prefix = arg + 13;
2672 else if (!strcmp(arg, "--no-prefix"))
2673 options->a_prefix = options->b_prefix = "";
2674 else if (opt_arg(arg, '\0', "inter-hunk-context",
2675 &options->interhunkcontext))
2676 ;
2677 else if (!prefixcmp(arg, "--output=")) {
2678 options->file = fopen(arg + strlen("--output="), "w");
2679 options->close_file = 1;
2680 } else
2681 return 0;
2682 return 1;
2683 }
2685 static int parse_num(const char **cp_p)
2686 {
2687 unsigned long num, scale;
2688 int ch, dot;
2689 const char *cp = *cp_p;
2691 num = 0;
2692 scale = 1;
2693 dot = 0;
2694 for(;;) {
2695 ch = *cp;
2696 if ( !dot && ch == '.' ) {
2697 scale = 1;
2698 dot = 1;
2699 } else if ( ch == '%' ) {
2700 scale = dot ? scale*100 : 100;
2701 cp++; /* % is always at the end */
2702 break;
2703 } else if ( ch >= '0' && ch <= '9' ) {
2704 if ( scale < 100000 ) {
2705 scale *= 10;
2706 num = (num*10) + (ch-'0');
2707 }
2708 } else {
2709 break;
2710 }
2711 cp++;
2712 }
2713 *cp_p = cp;
2715 /* user says num divided by scale and we say internally that
2716 * is MAX_SCORE * num / scale.
2717 */
2718 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2719 }
2721 static int diff_scoreopt_parse(const char *opt)
2722 {
2723 int opt1, opt2, cmd;
2725 if (*opt++ != '-')
2726 return -1;
2727 cmd = *opt++;
2728 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2729 return -1; /* that is not a -M, -C nor -B option */
2731 opt1 = parse_num(&opt);
2732 if (cmd != 'B')
2733 opt2 = 0;
2734 else {
2735 if (*opt == 0)
2736 opt2 = 0;
2737 else if (*opt != '/')
2738 return -1; /* we expect -B80/99 or -B80 */
2739 else {
2740 opt++;
2741 opt2 = parse_num(&opt);
2742 }
2743 }
2744 if (*opt != 0)
2745 return -1;
2746 return opt1 | (opt2 << 16);
2747 }
2749 struct diff_queue_struct diff_queued_diff;
2751 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2752 {
2753 if (queue->alloc <= queue->nr) {
2754 queue->alloc = alloc_nr(queue->alloc);
2755 queue->queue = xrealloc(queue->queue,
2756 sizeof(dp) * queue->alloc);
2757 }
2758 queue->queue[queue->nr++] = dp;
2759 }
2761 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2762 struct diff_filespec *one,
2763 struct diff_filespec *two)
2764 {
2765 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2766 dp->one = one;
2767 dp->two = two;
2768 if (queue)
2769 diff_q(queue, dp);
2770 return dp;
2771 }
2773 void diff_free_filepair(struct diff_filepair *p)
2774 {
2775 free_filespec(p->one);
2776 free_filespec(p->two);
2777 free(p);
2778 }
2780 /* This is different from find_unique_abbrev() in that
2781 * it stuffs the result with dots for alignment.
2782 */
2783 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2784 {
2785 int abblen;
2786 const char *abbrev;
2787 if (len == 40)
2788 return sha1_to_hex(sha1);
2790 abbrev = find_unique_abbrev(sha1, len);
2791 abblen = strlen(abbrev);
2792 if (abblen < 37) {
2793 static char hex[41];
2794 if (len < abblen && abblen <= len + 2)
2795 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2796 else
2797 sprintf(hex, "%s...", abbrev);
2798 return hex;
2799 }
2800 return sha1_to_hex(sha1);
2801 }
2803 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2804 {
2805 int line_termination = opt->line_termination;
2806 int inter_name_termination = line_termination ? '\t' : '\0';
2808 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2809 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2810 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2811 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2812 }
2813 if (p->score) {
2814 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2815 inter_name_termination);
2816 } else {
2817 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
2818 }
2820 if (p->status == DIFF_STATUS_COPIED ||
2821 p->status == DIFF_STATUS_RENAMED) {
2822 const char *name_a, *name_b;
2823 name_a = p->one->path;
2824 name_b = p->two->path;
2825 strip_prefix(opt->prefix_length, &name_a, &name_b);
2826 write_name_quoted(name_a, opt->file, inter_name_termination);
2827 write_name_quoted(name_b, opt->file, line_termination);
2828 } else {
2829 const char *name_a, *name_b;
2830 name_a = p->one->mode ? p->one->path : p->two->path;
2831 name_b = NULL;
2832 strip_prefix(opt->prefix_length, &name_a, &name_b);
2833 write_name_quoted(name_a, opt->file, line_termination);
2834 }
2835 }
2837 int diff_unmodified_pair(struct diff_filepair *p)
2838 {
2839 /* This function is written stricter than necessary to support
2840 * the currently implemented transformers, but the idea is to
2841 * let transformers to produce diff_filepairs any way they want,
2842 * and filter and clean them up here before producing the output.
2843 */
2844 struct diff_filespec *one = p->one, *two = p->two;
2846 if (DIFF_PAIR_UNMERGED(p))
2847 return 0; /* unmerged is interesting */
2849 /* deletion, addition, mode or type change
2850 * and rename are all interesting.
2851 */
2852 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2853 DIFF_PAIR_MODE_CHANGED(p) ||
2854 strcmp(one->path, two->path))
2855 return 0;
2857 /* both are valid and point at the same path. that is, we are
2858 * dealing with a change.
2859 */
2860 if (one->sha1_valid && two->sha1_valid &&
2861 !hashcmp(one->sha1, two->sha1))
2862 return 1; /* no change */
2863 if (!one->sha1_valid && !two->sha1_valid)
2864 return 1; /* both look at the same file on the filesystem. */
2865 return 0;
2866 }
2868 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2869 {
2870 if (diff_unmodified_pair(p))
2871 return;
2873 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2874 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2875 return; /* no tree diffs in patch format */
2877 run_diff(p, o);
2878 }
2880 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2881 struct diffstat_t *diffstat)
2882 {
2883 if (diff_unmodified_pair(p))
2884 return;
2886 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2887 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2888 return; /* no tree diffs in patch format */
2890 run_diffstat(p, o, diffstat);
2891 }
2893 static void diff_flush_checkdiff(struct diff_filepair *p,
2894 struct diff_options *o)
2895 {
2896 if (diff_unmodified_pair(p))
2897 return;
2899 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2900 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2901 return; /* no tree diffs in patch format */
2903 run_checkdiff(p, o);
2904 }
2906 int diff_queue_is_empty(void)
2907 {
2908 struct diff_queue_struct *q = &diff_queued_diff;
2909 int i;
2910 for (i = 0; i < q->nr; i++)
2911 if (!diff_unmodified_pair(q->queue[i]))
2912 return 0;
2913 return 1;
2914 }
2916 #if DIFF_DEBUG
2917 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2918 {
2919 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2920 x, one ? one : "",
2921 s->path,
2922 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2923 s->mode,
2924 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2925 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2926 x, one ? one : "",
2927 s->size, s->xfrm_flags);
2928 }
2930 void diff_debug_filepair(const struct diff_filepair *p, int i)
2931 {
2932 diff_debug_filespec(p->one, i, "one");
2933 diff_debug_filespec(p->two, i, "two");
2934 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2935 p->score, p->status ? p->status : '?',
2936 p->one->rename_used, p->broken_pair);
2937 }
2939 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2940 {
2941 int i;
2942 if (msg)
2943 fprintf(stderr, "%s\n", msg);
2944 fprintf(stderr, "q->nr = %d\n", q->nr);
2945 for (i = 0; i < q->nr; i++) {
2946 struct diff_filepair *p = q->queue[i];
2947 diff_debug_filepair(p, i);
2948 }
2949 }
2950 #endif
2952 static void diff_resolve_rename_copy(void)
2953 {
2954 int i;
2955 struct diff_filepair *p;
2956 struct diff_queue_struct *q = &diff_queued_diff;
2958 diff_debug_queue("resolve-rename-copy", q);
2960 for (i = 0; i < q->nr; i++) {
2961 p = q->queue[i];
2962 p->status = 0; /* undecided */
2963 if (DIFF_PAIR_UNMERGED(p))
2964 p->status = DIFF_STATUS_UNMERGED;
2965 else if (!DIFF_FILE_VALID(p->one))
2966 p->status = DIFF_STATUS_ADDED;
2967 else if (!DIFF_FILE_VALID(p->two))
2968 p->status = DIFF_STATUS_DELETED;
2969 else if (DIFF_PAIR_TYPE_CHANGED(p))
2970 p->status = DIFF_STATUS_TYPE_CHANGED;
2972 /* from this point on, we are dealing with a pair
2973 * whose both sides are valid and of the same type, i.e.
2974 * either in-place edit or rename/copy edit.
2975 */
2976 else if (DIFF_PAIR_RENAME(p)) {
2977 /*
2978 * A rename might have re-connected a broken
2979 * pair up, causing the pathnames to be the
2980 * same again. If so, that's not a rename at
2981 * all, just a modification..
2982 *
2983 * Otherwise, see if this source was used for
2984 * multiple renames, in which case we decrement
2985 * the count, and call it a copy.
2986 */
2987 if (!strcmp(p->one->path, p->two->path))
2988 p->status = DIFF_STATUS_MODIFIED;
2989 else if (--p->one->rename_used > 0)
2990 p->status = DIFF_STATUS_COPIED;
2991 else
2992 p->status = DIFF_STATUS_RENAMED;
2993 }
2994 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2995 p->one->mode != p->two->mode ||
2996 is_null_sha1(p->one->sha1))
2997 p->status = DIFF_STATUS_MODIFIED;
2998 else {
2999 /* This is a "no-change" entry and should not
3000 * happen anymore, but prepare for broken callers.
3001 */
3002 error("feeding unmodified %s to diffcore",
3003 p->one->path);
3004 p->status = DIFF_STATUS_UNKNOWN;
3005 }
3006 }
3007 diff_debug_queue("resolve-rename-copy done", q);
3008 }
3010 static int check_pair_status(struct diff_filepair *p)
3011 {
3012 switch (p->status) {
3013 case DIFF_STATUS_UNKNOWN:
3014 return 0;
3015 case 0:
3016 die("internal error in diff-resolve-rename-copy");
3017 default:
3018 return 1;
3019 }
3020 }
3022 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3023 {
3024 int fmt = opt->output_format;
3026 if (fmt & DIFF_FORMAT_CHECKDIFF)
3027 diff_flush_checkdiff(p, opt);
3028 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3029 diff_flush_raw(p, opt);
3030 else if (fmt & DIFF_FORMAT_NAME) {
3031 const char *name_a, *name_b;
3032 name_a = p->two->path;
3033 name_b = NULL;
3034 strip_prefix(opt->prefix_length, &name_a, &name_b);
3035 write_name_quoted(name_a, opt->file, opt->line_termination);
3036 }
3037 }
3039 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3040 {
3041 if (fs->mode)
3042 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3043 else
3044 fprintf(file, " %s ", newdelete);
3045 write_name_quoted(fs->path, file, '\n');
3046 }
3049 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
3050 {
3051 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3052 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
3053 show_name ? ' ' : '\n');
3054 if (show_name) {
3055 write_name_quoted(p->two->path, file, '\n');
3056 }
3057 }
3058 }
3060 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
3061 {
3062 char *names = pprint_rename(p->one->path, p->two->path);
3064 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3065 free(names);
3066 show_mode_change(file, p, 0);
3067 }
3069 static void diff_summary(FILE *file, struct diff_filepair *p)
3070 {
3071 switch(p->status) {
3072 case DIFF_STATUS_DELETED:
3073 show_file_mode_name(file, "delete", p->one);
3074 break;
3075 case DIFF_STATUS_ADDED:
3076 show_file_mode_name(file, "create", p->two);
3077 break;
3078 case DIFF_STATUS_COPIED:
3079 show_rename_copy(file, "copy", p);
3080 break;
3081 case DIFF_STATUS_RENAMED:
3082 show_rename_copy(file, "rename", p);
3083 break;
3084 default:
3085 if (p->score) {
3086 fputs(" rewrite ", file);
3087 write_name_quoted(p->two->path, file, ' ');
3088 fprintf(file, "(%d%%)\n", similarity_index(p));
3089 }
3090 show_mode_change(file, p, !p->score);
3091 break;
3092 }
3093 }
3095 struct patch_id_t {
3096 git_SHA_CTX *ctx;
3097 int patchlen;
3098 };
3100 static int remove_space(char *line, int len)
3101 {
3102 int i;
3103 char *dst = line;
3104 unsigned char c;
3106 for (i = 0; i < len; i++)
3107 if (!isspace((c = line[i])))
3108 *dst++ = c;
3110 return dst - line;
3111 }
3113 static void patch_id_consume(void *priv, char *line, unsigned long len)
3114 {
3115 struct patch_id_t *data = priv;
3116 int new_len;
3118 /* Ignore line numbers when computing the SHA1 of the patch */
3119 if (!prefixcmp(line, "@@ -"))
3120 return;
3122 new_len = remove_space(line, len);
3124 git_SHA1_Update(data->ctx, line, new_len);
3125 data->patchlen += new_len;
3126 }
3128 /* returns 0 upon success, and writes result into sha1 */
3129 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3130 {
3131 struct diff_queue_struct *q = &diff_queued_diff;
3132 int i;
3133 git_SHA_CTX ctx;
3134 struct patch_id_t data;
3135 char buffer[PATH_MAX * 4 + 20];
3137 git_SHA1_Init(&ctx);
3138 memset(&data, 0, sizeof(struct patch_id_t));
3139 data.ctx = &ctx;
3141 for (i = 0; i < q->nr; i++) {
3142 xpparam_t xpp;
3143 xdemitconf_t xecfg;
3144 xdemitcb_t ecb;
3145 mmfile_t mf1, mf2;
3146 struct diff_filepair *p = q->queue[i];
3147 int len1, len2;
3149 memset(&xpp, 0, sizeof(xpp));
3150 memset(&xecfg, 0, sizeof(xecfg));
3151 if (p->status == 0)
3152 return error("internal diff status error");
3153 if (p->status == DIFF_STATUS_UNKNOWN)
3154 continue;
3155 if (diff_unmodified_pair(p))
3156 continue;
3157 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3158 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3159 continue;
3160 if (DIFF_PAIR_UNMERGED(p))
3161 continue;
3163 diff_fill_sha1_info(p->one);
3164 diff_fill_sha1_info(p->two);
3165 if (fill_mmfile(&mf1, p->one) < 0 ||
3166 fill_mmfile(&mf2, p->two) < 0)
3167 return error("unable to read files to diff");
3169 len1 = remove_space(p->one->path, strlen(p->one->path));
3170 len2 = remove_space(p->two->path, strlen(p->two->path));
3171 if (p->one->mode == 0)
3172 len1 = snprintf(buffer, sizeof(buffer),
3173 "diff--gita/%.*sb/%.*s"
3174 "newfilemode%06o"
3175 "---/dev/null"
3176 "+++b/%.*s",
3177 len1, p->one->path,
3178 len2, p->two->path,
3179 p->two->mode,
3180 len2, p->two->path);
3181 else if (p->two->mode == 0)
3182 len1 = snprintf(buffer, sizeof(buffer),
3183 "diff--gita/%.*sb/%.*s"
3184 "deletedfilemode%06o"
3185 "---a/%.*s"
3186 "+++/dev/null",
3187 len1, p->one->path,
3188 len2, p->two->path,
3189 p->one->mode,
3190 len1, p->one->path);
3191 else
3192 len1 = snprintf(buffer, sizeof(buffer),
3193 "diff--gita/%.*sb/%.*s"
3194 "---a/%.*s"
3195 "+++b/%.*s",
3196 len1, p->one->path,
3197 len2, p->two->path,
3198 len1, p->one->path,
3199 len2, p->two->path);
3200 git_SHA1_Update(&ctx, buffer, len1);
3202 xpp.flags = XDF_NEED_MINIMAL;
3203 xecfg.ctxlen = 3;
3204 xecfg.flags = XDL_EMIT_FUNCNAMES;
3205 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3206 &xpp, &xecfg, &ecb);
3207 }
3209 git_SHA1_Final(sha1, &ctx);
3210 return 0;
3211 }
3213 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3214 {
3215 struct diff_queue_struct *q = &diff_queued_diff;
3216 int i;
3217 int result = diff_get_patch_id(options, sha1);
3219 for (i = 0; i < q->nr; i++)
3220 diff_free_filepair(q->queue[i]);
3222 free(q->queue);
3223 q->queue = NULL;
3224 q->nr = q->alloc = 0;
3226 return result;
3227 }
3229 static int is_summary_empty(const struct diff_queue_struct *q)
3230 {
3231 int i;
3233 for (i = 0; i < q->nr; i++) {
3234 const struct diff_filepair *p = q->queue[i];
3236 switch (p->status) {
3237 case DIFF_STATUS_DELETED:
3238 case DIFF_STATUS_ADDED:
3239 case DIFF_STATUS_COPIED:
3240 case DIFF_STATUS_RENAMED:
3241 return 0;
3242 default:
3243 if (p->score)
3244 return 0;
3245 if (p->one->mode && p->two->mode &&
3246 p->one->mode != p->two->mode)
3247 return 0;
3248 break;
3249 }
3250 }
3251 return 1;
3252 }
3254 void diff_flush(struct diff_options *options)
3255 {
3256 struct diff_queue_struct *q = &diff_queued_diff;
3257 int i, output_format = options->output_format;
3258 int separator = 0;
3260 /*
3261 * Order: raw, stat, summary, patch
3262 * or: name/name-status/checkdiff (other bits clear)
3263 */
3264 if (!q->nr)
3265 goto free_queue;
3267 if (output_format & (DIFF_FORMAT_RAW |
3268 DIFF_FORMAT_NAME |
3269 DIFF_FORMAT_NAME_STATUS |
3270 DIFF_FORMAT_CHECKDIFF)) {
3271 for (i = 0; i < q->nr; i++) {
3272 struct diff_filepair *p = q->queue[i];
3273 if (check_pair_status(p))
3274 flush_one_pair(p, options);
3275 }
3276 separator++;
3277 }
3279 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3280 struct diffstat_t diffstat;
3282 memset(&diffstat, 0, sizeof(struct diffstat_t));
3283 for (i = 0; i < q->nr; i++) {
3284 struct diff_filepair *p = q->queue[i];
3285 if (check_pair_status(p))
3286 diff_flush_stat(p, options, &diffstat);
3287 }
3288 if (output_format & DIFF_FORMAT_NUMSTAT)
3289 show_numstat(&diffstat, options);
3290 if (output_format & DIFF_FORMAT_DIFFSTAT)
3291 show_stats(&diffstat, options);
3292 if (output_format & DIFF_FORMAT_SHORTSTAT)
3293 show_shortstats(&diffstat, options);
3294 free_diffstat_info(&diffstat);
3295 separator++;
3296 }
3297 if (output_format & DIFF_FORMAT_DIRSTAT)
3298 show_dirstat(options);
3300 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3301 for (i = 0; i < q->nr; i++)
3302 diff_summary(options->file, q->queue[i]);
3303 separator++;
3304 }
3306 if (output_format & DIFF_FORMAT_PATCH) {
3307 if (separator) {
3308 putc(options->line_termination, options->file);
3309 if (options->stat_sep) {
3310 /* attach patch instead of inline */
3311 fputs(options->stat_sep, options->file);
3312 }
3313 }
3315 for (i = 0; i < q->nr; i++) {
3316 struct diff_filepair *p = q->queue[i];
3317 if (check_pair_status(p))
3318 diff_flush_patch(p, options);
3319 }
3320 }
3322 if (output_format & DIFF_FORMAT_CALLBACK)
3323 options->format_callback(q, options, options->format_callback_data);
3325 for (i = 0; i < q->nr; i++)
3326 diff_free_filepair(q->queue[i]);
3327 free_queue:
3328 free(q->queue);
3329 q->queue = NULL;
3330 q->nr = q->alloc = 0;
3331 if (options->close_file)
3332 fclose(options->file);
3333 }
3335 static void diffcore_apply_filter(const char *filter)
3336 {
3337 int i;
3338 struct diff_queue_struct *q = &diff_queued_diff;
3339 struct diff_queue_struct outq;
3340 outq.queue = NULL;
3341 outq.nr = outq.alloc = 0;
3343 if (!filter)
3344 return;
3346 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3347 int found;
3348 for (i = found = 0; !found && i < q->nr; i++) {
3349 struct diff_filepair *p = q->queue[i];
3350 if (((p->status == DIFF_STATUS_MODIFIED) &&
3351 ((p->score &&
3352 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3353 (!p->score &&
3354 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3355 ((p->status != DIFF_STATUS_MODIFIED) &&
3356 strchr(filter, p->status)))
3357 found++;
3358 }
3359 if (found)
3360 return;
3362 /* otherwise we will clear the whole queue
3363 * by copying the empty outq at the end of this
3364 * function, but first clear the current entries
3365 * in the queue.
3366 */
3367 for (i = 0; i < q->nr; i++)
3368 diff_free_filepair(q->queue[i]);
3369 }
3370 else {
3371 /* Only the matching ones */
3372 for (i = 0; i < q->nr; i++) {
3373 struct diff_filepair *p = q->queue[i];
3375 if (((p->status == DIFF_STATUS_MODIFIED) &&
3376 ((p->score &&
3377 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3378 (!p->score &&
3379 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3380 ((p->status != DIFF_STATUS_MODIFIED) &&
3381 strchr(filter, p->status)))
3382 diff_q(&outq, p);
3383 else
3384 diff_free_filepair(p);
3385 }
3386 }
3387 free(q->queue);
3388 *q = outq;
3389 }
3391 /* Check whether two filespecs with the same mode and size are identical */
3392 static int diff_filespec_is_identical(struct diff_filespec *one,
3393 struct diff_filespec *two)
3394 {
3395 if (S_ISGITLINK(one->mode))
3396 return 0;
3397 if (diff_populate_filespec(one, 0))
3398 return 0;
3399 if (diff_populate_filespec(two, 0))
3400 return 0;
3401 return !memcmp(one->data, two->data, one->size);
3402 }
3404 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3405 {
3406 int i;
3407 struct diff_queue_struct *q = &diff_queued_diff;
3408 struct diff_queue_struct outq;
3409 outq.queue = NULL;
3410 outq.nr = outq.alloc = 0;
3412 for (i = 0; i < q->nr; i++) {
3413 struct diff_filepair *p = q->queue[i];
3415 /*
3416 * 1. Entries that come from stat info dirtyness
3417 * always have both sides (iow, not create/delete),
3418 * one side of the object name is unknown, with
3419 * the same mode and size. Keep the ones that
3420 * do not match these criteria. They have real
3421 * differences.
3422 *
3423 * 2. At this point, the file is known to be modified,
3424 * with the same mode and size, and the object
3425 * name of one side is unknown. Need to inspect
3426 * the identical contents.
3427 */
3428 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3429 !DIFF_FILE_VALID(p->two) ||
3430 (p->one->sha1_valid && p->two->sha1_valid) ||
3431 (p->one->mode != p->two->mode) ||
3432 diff_populate_filespec(p->one, 1) ||
3433 diff_populate_filespec(p->two, 1) ||
3434 (p->one->size != p->two->size) ||
3435 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3436 diff_q(&outq, p);
3437 else {
3438 /*
3439 * The caller can subtract 1 from skip_stat_unmatch
3440 * to determine how many paths were dirty only
3441 * due to stat info mismatch.
3442 */
3443 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3444 diffopt->skip_stat_unmatch++;
3445 diff_free_filepair(p);
3446 }
3447 }
3448 free(q->queue);
3449 *q = outq;
3450 }
3452 void diffcore_std(struct diff_options *options)
3453 {
3454 if (options->skip_stat_unmatch)
3455 diffcore_skip_stat_unmatch(options);
3456 if (options->break_opt != -1)
3457 diffcore_break(options->break_opt);
3458 if (options->detect_rename)
3459 diffcore_rename(options);
3460 if (options->break_opt != -1)
3461 diffcore_merge_broken();
3462 if (options->pickaxe)
3463 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3464 if (options->orderfile)
3465 diffcore_order(options->orderfile);
3466 diff_resolve_rename_copy();
3467 diffcore_apply_filter(options->filter);
3469 if (diff_queued_diff.nr)
3470 DIFF_OPT_SET(options, HAS_CHANGES);
3471 else
3472 DIFF_OPT_CLR(options, HAS_CHANGES);
3473 }
3475 int diff_result_code(struct diff_options *opt, int status)
3476 {
3477 int result = 0;
3478 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3479 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3480 return status;
3481 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3482 DIFF_OPT_TST(opt, HAS_CHANGES))
3483 result |= 01;
3484 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3485 DIFF_OPT_TST(opt, CHECK_FAILED))
3486 result |= 02;
3487 return result;
3488 }
3490 void diff_addremove(struct diff_options *options,
3491 int addremove, unsigned mode,
3492 const unsigned char *sha1,
3493 const char *concatpath)
3494 {
3495 struct diff_filespec *one, *two;
3497 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3498 return;
3500 /* This may look odd, but it is a preparation for
3501 * feeding "there are unchanged files which should
3502 * not produce diffs, but when you are doing copy
3503 * detection you would need them, so here they are"
3504 * entries to the diff-core. They will be prefixed
3505 * with something like '=' or '*' (I haven't decided
3506 * which but should not make any difference).
3507 * Feeding the same new and old to diff_change()
3508 * also has the same effect.
3509 * Before the final output happens, they are pruned after
3510 * merged into rename/copy pairs as appropriate.
3511 */
3512 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3513 addremove = (addremove == '+' ? '-' :
3514 addremove == '-' ? '+' : addremove);
3516 if (options->prefix &&
3517 strncmp(concatpath, options->prefix, options->prefix_length))
3518 return;
3520 one = alloc_filespec(concatpath);
3521 two = alloc_filespec(concatpath);
3523 if (addremove != '+')
3524 fill_filespec(one, sha1, mode);
3525 if (addremove != '-')
3526 fill_filespec(two, sha1, mode);
3528 diff_queue(&diff_queued_diff, one, two);
3529 DIFF_OPT_SET(options, HAS_CHANGES);
3530 }
3532 void diff_change(struct diff_options *options,
3533 unsigned old_mode, unsigned new_mode,
3534 const unsigned char *old_sha1,
3535 const unsigned char *new_sha1,
3536 const char *concatpath)
3537 {
3538 struct diff_filespec *one, *two;
3540 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3541 && S_ISGITLINK(new_mode))
3542 return;
3544 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3545 unsigned tmp;
3546 const unsigned char *tmp_c;
3547 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3548 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3549 }
3551 if (options->prefix &&
3552 strncmp(concatpath, options->prefix, options->prefix_length))
3553 return;
3555 one = alloc_filespec(concatpath);
3556 two = alloc_filespec(concatpath);
3557 fill_filespec(one, old_sha1, old_mode);
3558 fill_filespec(two, new_sha1, new_mode);
3560 diff_queue(&diff_queued_diff, one, two);
3561 DIFF_OPT_SET(options, HAS_CHANGES);
3562 }
3564 void diff_unmerge(struct diff_options *options,
3565 const char *path,
3566 unsigned mode, const unsigned char *sha1)
3567 {
3568 struct diff_filespec *one, *two;
3570 if (options->prefix &&
3571 strncmp(path, options->prefix, options->prefix_length))
3572 return;
3574 one = alloc_filespec(path);
3575 two = alloc_filespec(path);
3576 fill_filespec(one, sha1, mode);
3577 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3578 }
3580 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
3581 size_t *outsize)
3582 {
3583 struct diff_tempfile *temp;
3584 const char *argv[3];
3585 const char **arg = argv;
3586 struct child_process child;
3587 struct strbuf buf = STRBUF_INIT;
3589 temp = prepare_temp_file(spec->path, spec);
3590 *arg++ = pgm;
3591 *arg++ = temp->name;
3592 *arg = NULL;
3594 memset(&child, 0, sizeof(child));
3595 child.argv = argv;
3596 child.out = -1;
3597 if (start_command(&child) != 0 ||
3598 strbuf_read(&buf, child.out, 0) < 0 ||
3599 finish_command(&child) != 0) {
3600 strbuf_release(&buf);
3601 remove_tempfile();
3602 error("error running textconv command '%s'", pgm);
3603 return NULL;
3604 }
3605 remove_tempfile();
3607 return strbuf_detach(&buf, outsize);
3608 }