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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 "\033[m", /* reset */
34 "", /* PLAIN (normal) */
35 "\033[1m", /* METAINFO (bold) */
36 "\033[36m", /* FRAGINFO (cyan) */
37 "\033[31m", /* OLD (red) */
38 "\033[32m", /* NEW (green) */
39 "\033[33m", /* COMMIT (yellow) */
40 "\033[41m", /* WHITESPACE (red background) */
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 /*
66 * These are to give UI layer defaults.
67 * The core-level commands such as git-diff-files should
68 * never be affected by the setting of diff.renames
69 * the user happens to have in the configuration file.
70 */
71 int git_diff_ui_config(const char *var, const char *value, void *cb)
72 {
73 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
74 diff_use_color_default = git_config_colorbool(var, value, -1);
75 return 0;
76 }
77 if (!strcmp(var, "diff.renames")) {
78 if (!value)
79 diff_detect_rename_default = DIFF_DETECT_RENAME;
80 else if (!strcasecmp(value, "copies") ||
81 !strcasecmp(value, "copy"))
82 diff_detect_rename_default = DIFF_DETECT_COPY;
83 else if (git_config_bool(var,value))
84 diff_detect_rename_default = DIFF_DETECT_RENAME;
85 return 0;
86 }
87 if (!strcmp(var, "diff.autorefreshindex")) {
88 diff_auto_refresh_index = git_config_bool(var, value);
89 return 0;
90 }
91 if (!strcmp(var, "diff.mnemonicprefix")) {
92 diff_mnemonic_prefix = git_config_bool(var, value);
93 return 0;
94 }
95 if (!strcmp(var, "diff.external"))
96 return git_config_string(&external_diff_cmd_cfg, var, value);
97 if (!strcmp(var, "diff.wordregex"))
98 return git_config_string(&diff_word_regex_cfg, var, value);
100 return git_diff_basic_config(var, value, cb);
101 }
103 int git_diff_basic_config(const char *var, const char *value, void *cb)
104 {
105 if (!strcmp(var, "diff.renamelimit")) {
106 diff_rename_limit_default = git_config_int(var, value);
107 return 0;
108 }
110 switch (userdiff_config(var, value)) {
111 case 0: break;
112 case -1: return -1;
113 default: return 0;
114 }
116 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
117 int slot = parse_diff_color_slot(var, 11);
118 if (!value)
119 return config_error_nonbool(var);
120 color_parse(value, var, diff_colors[slot]);
121 return 0;
122 }
124 /* like GNU diff's --suppress-blank-empty option */
125 if (!strcmp(var, "diff.suppressblankempty") ||
126 /* for backwards compatibility */
127 !strcmp(var, "diff.suppress-blank-empty")) {
128 diff_suppress_blank_empty = git_config_bool(var, value);
129 return 0;
130 }
132 return git_color_default_config(var, value, cb);
133 }
135 static char *quote_two(const char *one, const char *two)
136 {
137 int need_one = quote_c_style(one, NULL, NULL, 1);
138 int need_two = quote_c_style(two, NULL, NULL, 1);
139 struct strbuf res = STRBUF_INIT;
141 if (need_one + need_two) {
142 strbuf_addch(&res, '"');
143 quote_c_style(one, &res, NULL, 1);
144 quote_c_style(two, &res, NULL, 1);
145 strbuf_addch(&res, '"');
146 } else {
147 strbuf_addstr(&res, one);
148 strbuf_addstr(&res, two);
149 }
150 return strbuf_detach(&res, NULL);
151 }
153 static const char *external_diff(void)
154 {
155 static const char *external_diff_cmd = NULL;
156 static int done_preparing = 0;
158 if (done_preparing)
159 return external_diff_cmd;
160 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
161 if (!external_diff_cmd)
162 external_diff_cmd = external_diff_cmd_cfg;
163 done_preparing = 1;
164 return external_diff_cmd;
165 }
167 static struct diff_tempfile {
168 const char *name; /* filename external diff should read from */
169 char hex[41];
170 char mode[10];
171 char tmp_path[PATH_MAX];
172 } diff_temp[2];
174 static struct diff_tempfile *claim_diff_tempfile(void) {
175 int i;
176 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
177 if (!diff_temp[i].name)
178 return diff_temp + i;
179 die("BUG: diff is failing to clean up its tempfiles");
180 }
182 static int remove_tempfile_installed;
184 static void remove_tempfile(void)
185 {
186 int i;
187 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
188 if (diff_temp[i].name == diff_temp[i].tmp_path) {
189 unlink(diff_temp[i].name);
190 diff_temp[i].name = NULL;
191 }
192 }
194 static void remove_tempfile_on_signal(int signo)
195 {
196 remove_tempfile();
197 sigchain_pop(signo);
198 raise(signo);
199 }
201 static int count_lines(const char *data, int size)
202 {
203 int count, ch, completely_empty = 1, nl_just_seen = 0;
204 count = 0;
205 while (0 < size--) {
206 ch = *data++;
207 if (ch == '\n') {
208 count++;
209 nl_just_seen = 1;
210 completely_empty = 0;
211 }
212 else {
213 nl_just_seen = 0;
214 completely_empty = 0;
215 }
216 }
217 if (completely_empty)
218 return 0;
219 if (!nl_just_seen)
220 count++; /* no trailing newline */
221 return count;
222 }
224 static void print_line_count(FILE *file, int count)
225 {
226 switch (count) {
227 case 0:
228 fprintf(file, "0,0");
229 break;
230 case 1:
231 fprintf(file, "1");
232 break;
233 default:
234 fprintf(file, "1,%d", count);
235 break;
236 }
237 }
239 static void copy_file_with_prefix(FILE *file,
240 int prefix, const char *data, int size,
241 const char *set, const char *reset)
242 {
243 int ch, nl_just_seen = 1;
244 while (0 < size--) {
245 ch = *data++;
246 if (nl_just_seen) {
247 fputs(set, file);
248 putc(prefix, file);
249 }
250 if (ch == '\n') {
251 nl_just_seen = 1;
252 fputs(reset, file);
253 } else
254 nl_just_seen = 0;
255 putc(ch, file);
256 }
257 if (!nl_just_seen)
258 fprintf(file, "%s\n\\ No newline at end of file\n", reset);
259 }
261 static void emit_rewrite_diff(const char *name_a,
262 const char *name_b,
263 struct diff_filespec *one,
264 struct diff_filespec *two,
265 const char *textconv_one,
266 const char *textconv_two,
267 struct diff_options *o)
268 {
269 int lc_a, lc_b;
270 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
271 const char *name_a_tab, *name_b_tab;
272 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
273 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
274 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
275 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
276 const char *reset = diff_get_color(color_diff, DIFF_RESET);
277 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
278 const char *a_prefix, *b_prefix;
279 const char *data_one, *data_two;
280 size_t size_one, size_two;
282 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
283 a_prefix = o->b_prefix;
284 b_prefix = o->a_prefix;
285 } else {
286 a_prefix = o->a_prefix;
287 b_prefix = o->b_prefix;
288 }
290 name_a += (*name_a == '/');
291 name_b += (*name_b == '/');
292 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
293 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
295 strbuf_reset(&a_name);
296 strbuf_reset(&b_name);
297 quote_two_c_style(&a_name, a_prefix, name_a, 0);
298 quote_two_c_style(&b_name, b_prefix, name_b, 0);
300 diff_populate_filespec(one, 0);
301 diff_populate_filespec(two, 0);
302 if (textconv_one) {
303 data_one = run_textconv(textconv_one, one, &size_one);
304 if (!data_one)
305 die("unable to read files to diff");
306 }
307 else {
308 data_one = one->data;
309 size_one = one->size;
310 }
311 if (textconv_two) {
312 data_two = run_textconv(textconv_two, two, &size_two);
313 if (!data_two)
314 die("unable to read files to diff");
315 }
316 else {
317 data_two = two->data;
318 size_two = two->size;
319 }
321 lc_a = count_lines(data_one, size_one);
322 lc_b = count_lines(data_two, size_two);
323 fprintf(o->file,
324 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
325 metainfo, a_name.buf, name_a_tab, reset,
326 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
327 print_line_count(o->file, lc_a);
328 fprintf(o->file, " +");
329 print_line_count(o->file, lc_b);
330 fprintf(o->file, " @@%s\n", reset);
331 if (lc_a)
332 copy_file_with_prefix(o->file, '-', data_one, size_one, old, reset);
333 if (lc_b)
334 copy_file_with_prefix(o->file, '+', data_two, size_two, new, reset);
335 }
337 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
338 {
339 if (!DIFF_FILE_VALID(one)) {
340 mf->ptr = (char *)""; /* does not matter */
341 mf->size = 0;
342 return 0;
343 }
344 else if (diff_populate_filespec(one, 0))
345 return -1;
347 mf->ptr = one->data;
348 mf->size = one->size;
349 return 0;
350 }
352 struct diff_words_buffer {
353 mmfile_t text;
354 long alloc;
355 struct diff_words_orig {
356 const char *begin, *end;
357 } *orig;
358 int orig_nr, orig_alloc;
359 };
361 static void diff_words_append(char *line, unsigned long len,
362 struct diff_words_buffer *buffer)
363 {
364 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
365 line++;
366 len--;
367 memcpy(buffer->text.ptr + buffer->text.size, line, len);
368 buffer->text.size += len;
369 buffer->text.ptr[buffer->text.size] = '\0';
370 }
372 struct diff_words_data {
373 struct diff_words_buffer minus, plus;
374 const char *current_plus;
375 FILE *file;
376 regex_t *word_regex;
377 };
379 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
380 {
381 struct diff_words_data *diff_words = priv;
382 int minus_first, minus_len, plus_first, plus_len;
383 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
385 if (line[0] != '@' || parse_hunk_header(line, len,
386 &minus_first, &minus_len, &plus_first, &plus_len))
387 return;
389 /* POSIX requires that first be decremented by one if len == 0... */
390 if (minus_len) {
391 minus_begin = diff_words->minus.orig[minus_first].begin;
392 minus_end =
393 diff_words->minus.orig[minus_first + minus_len - 1].end;
394 } else
395 minus_begin = minus_end =
396 diff_words->minus.orig[minus_first].end;
398 if (plus_len) {
399 plus_begin = diff_words->plus.orig[plus_first].begin;
400 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
401 } else
402 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
404 if (diff_words->current_plus != plus_begin)
405 fwrite(diff_words->current_plus,
406 plus_begin - diff_words->current_plus, 1,
407 diff_words->file);
408 if (minus_begin != minus_end)
409 color_fwrite_lines(diff_words->file,
410 diff_get_color(1, DIFF_FILE_OLD),
411 minus_end - minus_begin, minus_begin);
412 if (plus_begin != plus_end)
413 color_fwrite_lines(diff_words->file,
414 diff_get_color(1, DIFF_FILE_NEW),
415 plus_end - plus_begin, plus_begin);
417 diff_words->current_plus = plus_end;
418 }
420 /* This function starts looking at *begin, and returns 0 iff a word was found. */
421 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
422 int *begin, int *end)
423 {
424 if (word_regex && *begin < buffer->size) {
425 regmatch_t match[1];
426 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
427 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
428 '\n', match[0].rm_eo - match[0].rm_so);
429 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
430 *begin += match[0].rm_so;
431 return *begin >= *end;
432 }
433 return -1;
434 }
436 /* find the next word */
437 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
438 (*begin)++;
439 if (*begin >= buffer->size)
440 return -1;
442 /* find the end of the word */
443 *end = *begin + 1;
444 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
445 (*end)++;
447 return 0;
448 }
450 /*
451 * This function splits the words in buffer->text, stores the list with
452 * newline separator into out, and saves the offsets of the original words
453 * in buffer->orig.
454 */
455 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
456 regex_t *word_regex)
457 {
458 int i, j;
459 long alloc = 0;
461 out->size = 0;
462 out->ptr = NULL;
464 /* fake an empty "0th" word */
465 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
466 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
467 buffer->orig_nr = 1;
469 for (i = 0; i < buffer->text.size; i++) {
470 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
471 return;
473 /* store original boundaries */
474 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
475 buffer->orig_alloc);
476 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
477 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
478 buffer->orig_nr++;
480 /* store one word */
481 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
482 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
483 out->ptr[out->size + j - i] = '\n';
484 out->size += j - i + 1;
486 i = j - 1;
487 }
488 }
490 /* this executes the word diff on the accumulated buffers */
491 static void diff_words_show(struct diff_words_data *diff_words)
492 {
493 xpparam_t xpp;
494 xdemitconf_t xecfg;
495 xdemitcb_t ecb;
496 mmfile_t minus, plus;
498 /* special case: only removal */
499 if (!diff_words->plus.text.size) {
500 color_fwrite_lines(diff_words->file,
501 diff_get_color(1, DIFF_FILE_OLD),
502 diff_words->minus.text.size, diff_words->minus.text.ptr);
503 diff_words->minus.text.size = 0;
504 return;
505 }
507 diff_words->current_plus = diff_words->plus.text.ptr;
509 memset(&xpp, 0, sizeof(xpp));
510 memset(&xecfg, 0, sizeof(xecfg));
511 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
512 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
513 xpp.flags = XDF_NEED_MINIMAL;
514 /* as only the hunk header will be parsed, we need a 0-context */
515 xecfg.ctxlen = 0;
516 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
517 &xpp, &xecfg, &ecb);
518 free(minus.ptr);
519 free(plus.ptr);
520 if (diff_words->current_plus != diff_words->plus.text.ptr +
521 diff_words->plus.text.size)
522 fwrite(diff_words->current_plus,
523 diff_words->plus.text.ptr + diff_words->plus.text.size
524 - diff_words->current_plus, 1,
525 diff_words->file);
526 diff_words->minus.text.size = diff_words->plus.text.size = 0;
527 }
529 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
531 struct emit_callback {
532 int nparents, color_diff;
533 unsigned ws_rule;
534 sane_truncate_fn truncate;
535 const char **label_path;
536 struct diff_words_data *diff_words;
537 int *found_changesp;
538 FILE *file;
539 };
541 static void free_diff_words_data(struct emit_callback *ecbdata)
542 {
543 if (ecbdata->diff_words) {
544 /* flush buffers */
545 if (ecbdata->diff_words->minus.text.size ||
546 ecbdata->diff_words->plus.text.size)
547 diff_words_show(ecbdata->diff_words);
549 free (ecbdata->diff_words->minus.text.ptr);
550 free (ecbdata->diff_words->minus.orig);
551 free (ecbdata->diff_words->plus.text.ptr);
552 free (ecbdata->diff_words->plus.orig);
553 free(ecbdata->diff_words->word_regex);
554 free(ecbdata->diff_words);
555 ecbdata->diff_words = NULL;
556 }
557 }
559 const char *diff_get_color(int diff_use_color, enum color_diff ix)
560 {
561 if (diff_use_color)
562 return diff_colors[ix];
563 return "";
564 }
566 static void emit_line(FILE *file, const char *set, const char *reset, const char *line, int len)
567 {
568 int has_trailing_newline, has_trailing_carriage_return;
570 has_trailing_newline = (len > 0 && line[len-1] == '\n');
571 if (has_trailing_newline)
572 len--;
573 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
574 if (has_trailing_carriage_return)
575 len--;
577 fputs(set, file);
578 fwrite(line, len, 1, file);
579 fputs(reset, file);
580 if (has_trailing_carriage_return)
581 fputc('\r', file);
582 if (has_trailing_newline)
583 fputc('\n', file);
584 }
586 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
587 {
588 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
589 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
591 if (!*ws)
592 emit_line(ecbdata->file, set, reset, line, len);
593 else {
594 /* Emit just the prefix, then the rest. */
595 emit_line(ecbdata->file, set, reset, line, ecbdata->nparents);
596 ws_check_emit(line + ecbdata->nparents,
597 len - ecbdata->nparents, ecbdata->ws_rule,
598 ecbdata->file, set, reset, ws);
599 }
600 }
602 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
603 {
604 const char *cp;
605 unsigned long allot;
606 size_t l = len;
608 if (ecb->truncate)
609 return ecb->truncate(line, len);
610 cp = line;
611 allot = l;
612 while (0 < l) {
613 (void) utf8_width(&cp, &l);
614 if (!cp)
615 break; /* truncated in the middle? */
616 }
617 return allot - l;
618 }
620 static void fn_out_consume(void *priv, char *line, unsigned long len)
621 {
622 int i;
623 int color;
624 struct emit_callback *ecbdata = priv;
625 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
626 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
627 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
629 *(ecbdata->found_changesp) = 1;
631 if (ecbdata->label_path[0]) {
632 const char *name_a_tab, *name_b_tab;
634 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
635 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
637 fprintf(ecbdata->file, "%s--- %s%s%s\n",
638 meta, ecbdata->label_path[0], reset, name_a_tab);
639 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
640 meta, ecbdata->label_path[1], reset, name_b_tab);
641 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
642 }
644 if (diff_suppress_blank_empty
645 && len == 2 && line[0] == ' ' && line[1] == '\n') {
646 line[0] = '\n';
647 len = 1;
648 }
650 /* This is not really necessary for now because
651 * this codepath only deals with two-way diffs.
652 */
653 for (i = 0; i < len && line[i] == '@'; i++)
654 ;
655 if (2 <= i && i < len && line[i] == ' ') {
656 ecbdata->nparents = i - 1;
657 len = sane_truncate_line(ecbdata, line, len);
658 emit_line(ecbdata->file,
659 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
660 reset, line, len);
661 if (line[len-1] != '\n')
662 putc('\n', ecbdata->file);
663 return;
664 }
666 if (len < ecbdata->nparents) {
667 emit_line(ecbdata->file, reset, reset, line, len);
668 return;
669 }
671 color = DIFF_PLAIN;
672 if (ecbdata->diff_words && ecbdata->nparents != 1)
673 /* fall back to normal diff */
674 free_diff_words_data(ecbdata);
675 if (ecbdata->diff_words) {
676 if (line[0] == '-') {
677 diff_words_append(line, len,
678 &ecbdata->diff_words->minus);
679 return;
680 } else if (line[0] == '+') {
681 diff_words_append(line, len,
682 &ecbdata->diff_words->plus);
683 return;
684 }
685 if (ecbdata->diff_words->minus.text.size ||
686 ecbdata->diff_words->plus.text.size)
687 diff_words_show(ecbdata->diff_words);
688 line++;
689 len--;
690 emit_line(ecbdata->file, plain, reset, line, len);
691 return;
692 }
693 for (i = 0; i < ecbdata->nparents && len; i++) {
694 if (line[i] == '-')
695 color = DIFF_FILE_OLD;
696 else if (line[i] == '+')
697 color = DIFF_FILE_NEW;
698 }
700 if (color != DIFF_FILE_NEW) {
701 emit_line(ecbdata->file,
702 diff_get_color(ecbdata->color_diff, color),
703 reset, line, len);
704 return;
705 }
706 emit_add_line(reset, ecbdata, line, len);
707 }
709 static char *pprint_rename(const char *a, const char *b)
710 {
711 const char *old = a;
712 const char *new = b;
713 struct strbuf name = STRBUF_INIT;
714 int pfx_length, sfx_length;
715 int len_a = strlen(a);
716 int len_b = strlen(b);
717 int a_midlen, b_midlen;
718 int qlen_a = quote_c_style(a, NULL, NULL, 0);
719 int qlen_b = quote_c_style(b, NULL, NULL, 0);
721 if (qlen_a || qlen_b) {
722 quote_c_style(a, &name, NULL, 0);
723 strbuf_addstr(&name, " => ");
724 quote_c_style(b, &name, NULL, 0);
725 return strbuf_detach(&name, NULL);
726 }
728 /* Find common prefix */
729 pfx_length = 0;
730 while (*old && *new && *old == *new) {
731 if (*old == '/')
732 pfx_length = old - a + 1;
733 old++;
734 new++;
735 }
737 /* Find common suffix */
738 old = a + len_a;
739 new = b + len_b;
740 sfx_length = 0;
741 while (a <= old && b <= new && *old == *new) {
742 if (*old == '/')
743 sfx_length = len_a - (old - a);
744 old--;
745 new--;
746 }
748 /*
749 * pfx{mid-a => mid-b}sfx
750 * {pfx-a => pfx-b}sfx
751 * pfx{sfx-a => sfx-b}
752 * name-a => name-b
753 */
754 a_midlen = len_a - pfx_length - sfx_length;
755 b_midlen = len_b - pfx_length - sfx_length;
756 if (a_midlen < 0)
757 a_midlen = 0;
758 if (b_midlen < 0)
759 b_midlen = 0;
761 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
762 if (pfx_length + sfx_length) {
763 strbuf_add(&name, a, pfx_length);
764 strbuf_addch(&name, '{');
765 }
766 strbuf_add(&name, a + pfx_length, a_midlen);
767 strbuf_addstr(&name, " => ");
768 strbuf_add(&name, b + pfx_length, b_midlen);
769 if (pfx_length + sfx_length) {
770 strbuf_addch(&name, '}');
771 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
772 }
773 return strbuf_detach(&name, NULL);
774 }
776 struct diffstat_t {
777 int nr;
778 int alloc;
779 struct diffstat_file {
780 char *from_name;
781 char *name;
782 char *print_name;
783 unsigned is_unmerged:1;
784 unsigned is_binary:1;
785 unsigned is_renamed:1;
786 unsigned int added, deleted;
787 } **files;
788 };
790 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
791 const char *name_a,
792 const char *name_b)
793 {
794 struct diffstat_file *x;
795 x = xcalloc(sizeof (*x), 1);
796 if (diffstat->nr == diffstat->alloc) {
797 diffstat->alloc = alloc_nr(diffstat->alloc);
798 diffstat->files = xrealloc(diffstat->files,
799 diffstat->alloc * sizeof(x));
800 }
801 diffstat->files[diffstat->nr++] = x;
802 if (name_b) {
803 x->from_name = xstrdup(name_a);
804 x->name = xstrdup(name_b);
805 x->is_renamed = 1;
806 }
807 else {
808 x->from_name = NULL;
809 x->name = xstrdup(name_a);
810 }
811 return x;
812 }
814 static void diffstat_consume(void *priv, char *line, unsigned long len)
815 {
816 struct diffstat_t *diffstat = priv;
817 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
819 if (line[0] == '+')
820 x->added++;
821 else if (line[0] == '-')
822 x->deleted++;
823 }
825 const char mime_boundary_leader[] = "------------";
827 static int scale_linear(int it, int width, int max_change)
828 {
829 /*
830 * make sure that at least one '-' is printed if there were deletions,
831 * and likewise for '+'.
832 */
833 if (max_change < 2)
834 return it;
835 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
836 }
838 static void show_name(FILE *file,
839 const char *prefix, const char *name, int len,
840 const char *reset, const char *set)
841 {
842 fprintf(file, " %s%s%-*s%s |", set, prefix, len, name, reset);
843 }
845 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
846 {
847 if (cnt <= 0)
848 return;
849 fprintf(file, "%s", set);
850 while (cnt--)
851 putc(ch, file);
852 fprintf(file, "%s", reset);
853 }
855 static void fill_print_name(struct diffstat_file *file)
856 {
857 char *pname;
859 if (file->print_name)
860 return;
862 if (!file->is_renamed) {
863 struct strbuf buf = STRBUF_INIT;
864 if (quote_c_style(file->name, &buf, NULL, 0)) {
865 pname = strbuf_detach(&buf, NULL);
866 } else {
867 pname = file->name;
868 strbuf_release(&buf);
869 }
870 } else {
871 pname = pprint_rename(file->from_name, file->name);
872 }
873 file->print_name = pname;
874 }
876 static void show_stats(struct diffstat_t* data, struct diff_options *options)
877 {
878 int i, len, add, del, total, adds = 0, dels = 0;
879 int max_change = 0, max_len = 0;
880 int total_files = data->nr;
881 int width, name_width;
882 const char *reset, *set, *add_c, *del_c;
884 if (data->nr == 0)
885 return;
887 width = options->stat_width ? options->stat_width : 80;
888 name_width = options->stat_name_width ? options->stat_name_width : 50;
890 /* Sanity: give at least 5 columns to the graph,
891 * but leave at least 10 columns for the name.
892 */
893 if (width < 25)
894 width = 25;
895 if (name_width < 10)
896 name_width = 10;
897 else if (width < name_width + 15)
898 name_width = width - 15;
900 /* Find the longest filename and max number of changes */
901 reset = diff_get_color_opt(options, DIFF_RESET);
902 set = diff_get_color_opt(options, DIFF_PLAIN);
903 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
904 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
906 for (i = 0; i < data->nr; i++) {
907 struct diffstat_file *file = data->files[i];
908 int change = file->added + file->deleted;
909 fill_print_name(file);
910 len = strlen(file->print_name);
911 if (max_len < len)
912 max_len = len;
914 if (file->is_binary || file->is_unmerged)
915 continue;
916 if (max_change < change)
917 max_change = change;
918 }
920 /* Compute the width of the graph part;
921 * 10 is for one blank at the beginning of the line plus
922 * " | count " between the name and the graph.
923 *
924 * From here on, name_width is the width of the name area,
925 * and width is the width of the graph area.
926 */
927 name_width = (name_width < max_len) ? name_width : max_len;
928 if (width < (name_width + 10) + max_change)
929 width = width - (name_width + 10);
930 else
931 width = max_change;
933 for (i = 0; i < data->nr; i++) {
934 const char *prefix = "";
935 char *name = data->files[i]->print_name;
936 int added = data->files[i]->added;
937 int deleted = data->files[i]->deleted;
938 int name_len;
940 /*
941 * "scale" the filename
942 */
943 len = name_width;
944 name_len = strlen(name);
945 if (name_width < name_len) {
946 char *slash;
947 prefix = "...";
948 len -= 3;
949 name += name_len - len;
950 slash = strchr(name, '/');
951 if (slash)
952 name = slash;
953 }
955 if (data->files[i]->is_binary) {
956 show_name(options->file, prefix, name, len, reset, set);
957 fprintf(options->file, " Bin ");
958 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
959 fprintf(options->file, " -> ");
960 fprintf(options->file, "%s%d%s", add_c, added, reset);
961 fprintf(options->file, " bytes");
962 fprintf(options->file, "\n");
963 continue;
964 }
965 else if (data->files[i]->is_unmerged) {
966 show_name(options->file, prefix, name, len, reset, set);
967 fprintf(options->file, " Unmerged\n");
968 continue;
969 }
970 else if (!data->files[i]->is_renamed &&
971 (added + deleted == 0)) {
972 total_files--;
973 continue;
974 }
976 /*
977 * scale the add/delete
978 */
979 add = added;
980 del = deleted;
981 total = add + del;
982 adds += add;
983 dels += del;
985 if (width <= max_change) {
986 add = scale_linear(add, width, max_change);
987 del = scale_linear(del, width, max_change);
988 total = add + del;
989 }
990 show_name(options->file, prefix, name, len, reset, set);
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 "%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
999 set, total_files, adds, dels, reset);
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 }
1608 free_ab_and_return:
1609 diff_free_filespec_data(one);
1610 diff_free_filespec_data(two);
1611 free(a_one);
1612 free(b_two);
1613 return;
1614 }
1616 static void builtin_diffstat(const char *name_a, const char *name_b,
1617 struct diff_filespec *one,
1618 struct diff_filespec *two,
1619 struct diffstat_t *diffstat,
1620 struct diff_options *o,
1621 int complete_rewrite)
1622 {
1623 mmfile_t mf1, mf2;
1624 struct diffstat_file *data;
1626 data = diffstat_add(diffstat, name_a, name_b);
1628 if (!one || !two) {
1629 data->is_unmerged = 1;
1630 return;
1631 }
1632 if (complete_rewrite) {
1633 diff_populate_filespec(one, 0);
1634 diff_populate_filespec(two, 0);
1635 data->deleted = count_lines(one->data, one->size);
1636 data->added = count_lines(two->data, two->size);
1637 goto free_and_return;
1638 }
1639 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1640 die("unable to read files to diff");
1642 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1643 data->is_binary = 1;
1644 data->added = mf2.size;
1645 data->deleted = mf1.size;
1646 } else {
1647 /* Crazy xdl interfaces.. */
1648 xpparam_t xpp;
1649 xdemitconf_t xecfg;
1650 xdemitcb_t ecb;
1652 memset(&xpp, 0, sizeof(xpp));
1653 memset(&xecfg, 0, sizeof(xecfg));
1654 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1655 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
1656 &xpp, &xecfg, &ecb);
1657 }
1659 free_and_return:
1660 diff_free_filespec_data(one);
1661 diff_free_filespec_data(two);
1662 }
1664 static void builtin_checkdiff(const char *name_a, const char *name_b,
1665 const char *attr_path,
1666 struct diff_filespec *one,
1667 struct diff_filespec *two,
1668 struct diff_options *o)
1669 {
1670 mmfile_t mf1, mf2;
1671 struct checkdiff_t data;
1673 if (!two)
1674 return;
1676 memset(&data, 0, sizeof(data));
1677 data.filename = name_b ? name_b : name_a;
1678 data.lineno = 0;
1679 data.o = o;
1680 data.ws_rule = whitespace_rule(attr_path);
1682 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1683 die("unable to read files to diff");
1685 /*
1686 * All the other codepaths check both sides, but not checking
1687 * the "old" side here is deliberate. We are checking the newly
1688 * introduced changes, and as long as the "new" side is text, we
1689 * can and should check what it introduces.
1690 */
1691 if (diff_filespec_is_binary(two))
1692 goto free_and_return;
1693 else {
1694 /* Crazy xdl interfaces.. */
1695 xpparam_t xpp;
1696 xdemitconf_t xecfg;
1697 xdemitcb_t ecb;
1699 memset(&xpp, 0, sizeof(xpp));
1700 memset(&xecfg, 0, sizeof(xecfg));
1701 xecfg.ctxlen = 1; /* at least one context line */
1702 xpp.flags = XDF_NEED_MINIMAL;
1703 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
1704 &xpp, &xecfg, &ecb);
1706 if ((data.ws_rule & WS_TRAILING_SPACE) &&
1707 data.trailing_blanks_start) {
1708 fprintf(o->file, "%s:%d: ends with blank lines.\n",
1709 data.filename, data.trailing_blanks_start);
1710 data.status = 1; /* report errors */
1711 }
1712 }
1713 free_and_return:
1714 diff_free_filespec_data(one);
1715 diff_free_filespec_data(two);
1716 if (data.status)
1717 DIFF_OPT_SET(o, CHECK_FAILED);
1718 }
1720 struct diff_filespec *alloc_filespec(const char *path)
1721 {
1722 int namelen = strlen(path);
1723 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1725 memset(spec, 0, sizeof(*spec));
1726 spec->path = (char *)(spec + 1);
1727 memcpy(spec->path, path, namelen+1);
1728 spec->count = 1;
1729 spec->is_binary = -1;
1730 return spec;
1731 }
1733 void free_filespec(struct diff_filespec *spec)
1734 {
1735 if (!--spec->count) {
1736 diff_free_filespec_data(spec);
1737 free(spec);
1738 }
1739 }
1741 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1742 unsigned short mode)
1743 {
1744 if (mode) {
1745 spec->mode = canon_mode(mode);
1746 hashcpy(spec->sha1, sha1);
1747 spec->sha1_valid = !is_null_sha1(sha1);
1748 }
1749 }
1751 /*
1752 * Given a name and sha1 pair, if the index tells us the file in
1753 * the work tree has that object contents, return true, so that
1754 * prepare_temp_file() does not have to inflate and extract.
1755 */
1756 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1757 {
1758 struct cache_entry *ce;
1759 struct stat st;
1760 int pos, len;
1762 /* We do not read the cache ourselves here, because the
1763 * benchmark with my previous version that always reads cache
1764 * shows that it makes things worse for diff-tree comparing
1765 * two linux-2.6 kernel trees in an already checked out work
1766 * tree. This is because most diff-tree comparisons deal with
1767 * only a small number of files, while reading the cache is
1768 * expensive for a large project, and its cost outweighs the
1769 * savings we get by not inflating the object to a temporary
1770 * file. Practically, this code only helps when we are used
1771 * by diff-cache --cached, which does read the cache before
1772 * calling us.
1773 */
1774 if (!active_cache)
1775 return 0;
1777 /* We want to avoid the working directory if our caller
1778 * doesn't need the data in a normal file, this system
1779 * is rather slow with its stat/open/mmap/close syscalls,
1780 * and the object is contained in a pack file. The pack
1781 * is probably already open and will be faster to obtain
1782 * the data through than the working directory. Loose
1783 * objects however would tend to be slower as they need
1784 * to be individually opened and inflated.
1785 */
1786 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1787 return 0;
1789 len = strlen(name);
1790 pos = cache_name_pos(name, len);
1791 if (pos < 0)
1792 return 0;
1793 ce = active_cache[pos];
1795 /*
1796 * This is not the sha1 we are looking for, or
1797 * unreusable because it is not a regular file.
1798 */
1799 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1800 return 0;
1802 /*
1803 * If ce matches the file in the work tree, we can reuse it.
1804 */
1805 if (ce_uptodate(ce) ||
1806 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1807 return 1;
1809 return 0;
1810 }
1812 static int populate_from_stdin(struct diff_filespec *s)
1813 {
1814 struct strbuf buf = STRBUF_INIT;
1815 size_t size = 0;
1817 if (strbuf_read(&buf, 0, 0) < 0)
1818 return error("error while reading from stdin %s",
1819 strerror(errno));
1821 s->should_munmap = 0;
1822 s->data = strbuf_detach(&buf, &size);
1823 s->size = size;
1824 s->should_free = 1;
1825 return 0;
1826 }
1828 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1829 {
1830 int len;
1831 char *data = xmalloc(100);
1832 len = snprintf(data, 100,
1833 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1834 s->data = data;
1835 s->size = len;
1836 s->should_free = 1;
1837 if (size_only) {
1838 s->data = NULL;
1839 free(data);
1840 }
1841 return 0;
1842 }
1844 /*
1845 * While doing rename detection and pickaxe operation, we may need to
1846 * grab the data for the blob (or file) for our own in-core comparison.
1847 * diff_filespec has data and size fields for this purpose.
1848 */
1849 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1850 {
1851 int err = 0;
1852 if (!DIFF_FILE_VALID(s))
1853 die("internal error: asking to populate invalid file.");
1854 if (S_ISDIR(s->mode))
1855 return -1;
1857 if (s->data)
1858 return 0;
1860 if (size_only && 0 < s->size)
1861 return 0;
1863 if (S_ISGITLINK(s->mode))
1864 return diff_populate_gitlink(s, size_only);
1866 if (!s->sha1_valid ||
1867 reuse_worktree_file(s->path, s->sha1, 0)) {
1868 struct strbuf buf = STRBUF_INIT;
1869 struct stat st;
1870 int fd;
1872 if (!strcmp(s->path, "-"))
1873 return populate_from_stdin(s);
1875 if (lstat(s->path, &st) < 0) {
1876 if (errno == ENOENT) {
1877 err_empty:
1878 err = -1;
1879 empty:
1880 s->data = (char *)"";
1881 s->size = 0;
1882 return err;
1883 }
1884 }
1885 s->size = xsize_t(st.st_size);
1886 if (!s->size)
1887 goto empty;
1888 if (S_ISLNK(st.st_mode)) {
1889 struct strbuf sb = STRBUF_INIT;
1891 if (strbuf_readlink(&sb, s->path, s->size))
1892 goto err_empty;
1893 s->size = sb.len;
1894 s->data = strbuf_detach(&sb, NULL);
1895 s->should_free = 1;
1896 return 0;
1897 }
1898 if (size_only)
1899 return 0;
1900 fd = open(s->path, O_RDONLY);
1901 if (fd < 0)
1902 goto err_empty;
1903 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1904 close(fd);
1905 s->should_munmap = 1;
1907 /*
1908 * Convert from working tree format to canonical git format
1909 */
1910 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
1911 size_t size = 0;
1912 munmap(s->data, s->size);
1913 s->should_munmap = 0;
1914 s->data = strbuf_detach(&buf, &size);
1915 s->size = size;
1916 s->should_free = 1;
1917 }
1918 }
1919 else {
1920 enum object_type type;
1921 if (size_only)
1922 type = sha1_object_info(s->sha1, &s->size);
1923 else {
1924 s->data = read_sha1_file(s->sha1, &type, &s->size);
1925 s->should_free = 1;
1926 }
1927 }
1928 return 0;
1929 }
1931 void diff_free_filespec_blob(struct diff_filespec *s)
1932 {
1933 if (s->should_free)
1934 free(s->data);
1935 else if (s->should_munmap)
1936 munmap(s->data, s->size);
1938 if (s->should_free || s->should_munmap) {
1939 s->should_free = s->should_munmap = 0;
1940 s->data = NULL;
1941 }
1942 }
1944 void diff_free_filespec_data(struct diff_filespec *s)
1945 {
1946 diff_free_filespec_blob(s);
1947 free(s->cnt_data);
1948 s->cnt_data = NULL;
1949 }
1951 static void prep_temp_blob(struct diff_tempfile *temp,
1952 void *blob,
1953 unsigned long size,
1954 const unsigned char *sha1,
1955 int mode)
1956 {
1957 int fd;
1959 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1960 if (fd < 0)
1961 die("unable to create temp-file: %s", strerror(errno));
1962 if (write_in_full(fd, blob, size) != size)
1963 die("unable to write temp-file");
1964 close(fd);
1965 temp->name = temp->tmp_path;
1966 strcpy(temp->hex, sha1_to_hex(sha1));
1967 temp->hex[40] = 0;
1968 sprintf(temp->mode, "%06o", mode);
1969 }
1971 static struct diff_tempfile *prepare_temp_file(const char *name,
1972 struct diff_filespec *one)
1973 {
1974 struct diff_tempfile *temp = claim_diff_tempfile();
1976 if (!DIFF_FILE_VALID(one)) {
1977 not_a_valid_file:
1978 /* A '-' entry produces this for file-2, and
1979 * a '+' entry produces this for file-1.
1980 */
1981 temp->name = "/dev/null";
1982 strcpy(temp->hex, ".");
1983 strcpy(temp->mode, ".");
1984 return temp;
1985 }
1987 if (!remove_tempfile_installed) {
1988 atexit(remove_tempfile);
1989 sigchain_push_common(remove_tempfile_on_signal);
1990 remove_tempfile_installed = 1;
1991 }
1993 if (!one->sha1_valid ||
1994 reuse_worktree_file(name, one->sha1, 1)) {
1995 struct stat st;
1996 if (lstat(name, &st) < 0) {
1997 if (errno == ENOENT)
1998 goto not_a_valid_file;
1999 die("stat(%s): %s", name, strerror(errno));
2000 }
2001 if (S_ISLNK(st.st_mode)) {
2002 int ret;
2003 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
2004 ret = readlink(name, buf, sizeof(buf));
2005 if (ret < 0)
2006 die("readlink(%s)", name);
2007 if (ret == sizeof(buf))
2008 die("symlink too long: %s", name);
2009 prep_temp_blob(temp, buf, ret,
2010 (one->sha1_valid ?
2011 one->sha1 : null_sha1),
2012 (one->sha1_valid ?
2013 one->mode : S_IFLNK));
2014 }
2015 else {
2016 /* we can borrow from the file in the work tree */
2017 temp->name = name;
2018 if (!one->sha1_valid)
2019 strcpy(temp->hex, sha1_to_hex(null_sha1));
2020 else
2021 strcpy(temp->hex, sha1_to_hex(one->sha1));
2022 /* Even though we may sometimes borrow the
2023 * contents from the work tree, we always want
2024 * one->mode. mode is trustworthy even when
2025 * !(one->sha1_valid), as long as
2026 * DIFF_FILE_VALID(one).
2027 */
2028 sprintf(temp->mode, "%06o", one->mode);
2029 }
2030 return temp;
2031 }
2032 else {
2033 if (diff_populate_filespec(one, 0))
2034 die("cannot read data blob for %s", one->path);
2035 prep_temp_blob(temp, one->data, one->size,
2036 one->sha1, one->mode);
2037 }
2038 return temp;
2039 }
2041 /* An external diff command takes:
2042 *
2043 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2044 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2045 *
2046 */
2047 static void run_external_diff(const char *pgm,
2048 const char *name,
2049 const char *other,
2050 struct diff_filespec *one,
2051 struct diff_filespec *two,
2052 const char *xfrm_msg,
2053 int complete_rewrite)
2054 {
2055 const char *spawn_arg[10];
2056 int retval;
2057 const char **arg = &spawn_arg[0];
2059 if (one && two) {
2060 struct diff_tempfile *temp_one, *temp_two;
2061 const char *othername = (other ? other : name);
2062 temp_one = prepare_temp_file(name, one);
2063 temp_two = prepare_temp_file(othername, two);
2064 *arg++ = pgm;
2065 *arg++ = name;
2066 *arg++ = temp_one->name;
2067 *arg++ = temp_one->hex;
2068 *arg++ = temp_one->mode;
2069 *arg++ = temp_two->name;
2070 *arg++ = temp_two->hex;
2071 *arg++ = temp_two->mode;
2072 if (other) {
2073 *arg++ = other;
2074 *arg++ = xfrm_msg;
2075 }
2076 } else {
2077 *arg++ = pgm;
2078 *arg++ = name;
2079 }
2080 *arg = NULL;
2081 fflush(NULL);
2082 retval = run_command_v_opt(spawn_arg, 0);
2083 remove_tempfile();
2084 if (retval) {
2085 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2086 exit(1);
2087 }
2088 }
2090 static void run_diff_cmd(const char *pgm,
2091 const char *name,
2092 const char *other,
2093 const char *attr_path,
2094 struct diff_filespec *one,
2095 struct diff_filespec *two,
2096 const char *xfrm_msg,
2097 struct diff_options *o,
2098 int complete_rewrite)
2099 {
2100 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2101 pgm = NULL;
2102 else {
2103 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2104 if (drv && drv->external)
2105 pgm = drv->external;
2106 }
2108 if (pgm) {
2109 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2110 complete_rewrite);
2111 return;
2112 }
2113 if (one && two)
2114 builtin_diff(name, other ? other : name,
2115 one, two, xfrm_msg, o, complete_rewrite);
2116 else
2117 fprintf(o->file, "* Unmerged path %s\n", name);
2118 }
2120 static void diff_fill_sha1_info(struct diff_filespec *one)
2121 {
2122 if (DIFF_FILE_VALID(one)) {
2123 if (!one->sha1_valid) {
2124 struct stat st;
2125 if (!strcmp(one->path, "-")) {
2126 hashcpy(one->sha1, null_sha1);
2127 return;
2128 }
2129 if (lstat(one->path, &st) < 0)
2130 die("stat %s", one->path);
2131 if (index_path(one->sha1, one->path, &st, 0))
2132 die("cannot hash %s", one->path);
2133 }
2134 }
2135 else
2136 hashclr(one->sha1);
2137 }
2139 static int similarity_index(struct diff_filepair *p)
2140 {
2141 return p->score * 100 / MAX_SCORE;
2142 }
2144 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2145 {
2146 /* Strip the prefix but do not molest /dev/null and absolute paths */
2147 if (*namep && **namep != '/')
2148 *namep += prefix_length;
2149 if (*otherp && **otherp != '/')
2150 *otherp += prefix_length;
2151 }
2153 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2154 {
2155 const char *pgm = external_diff();
2156 struct strbuf msg;
2157 char *xfrm_msg;
2158 struct diff_filespec *one = p->one;
2159 struct diff_filespec *two = p->two;
2160 const char *name;
2161 const char *other;
2162 const char *attr_path;
2163 int complete_rewrite = 0;
2165 name = p->one->path;
2166 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2167 attr_path = name;
2168 if (o->prefix_length)
2169 strip_prefix(o->prefix_length, &name, &other);
2171 if (DIFF_PAIR_UNMERGED(p)) {
2172 run_diff_cmd(pgm, name, NULL, attr_path,
2173 NULL, NULL, NULL, o, 0);
2174 return;
2175 }
2177 diff_fill_sha1_info(one);
2178 diff_fill_sha1_info(two);
2180 strbuf_init(&msg, PATH_MAX * 2 + 300);
2181 switch (p->status) {
2182 case DIFF_STATUS_COPIED:
2183 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2184 strbuf_addstr(&msg, "\ncopy from ");
2185 quote_c_style(name, &msg, NULL, 0);
2186 strbuf_addstr(&msg, "\ncopy to ");
2187 quote_c_style(other, &msg, NULL, 0);
2188 strbuf_addch(&msg, '\n');
2189 break;
2190 case DIFF_STATUS_RENAMED:
2191 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2192 strbuf_addstr(&msg, "\nrename from ");
2193 quote_c_style(name, &msg, NULL, 0);
2194 strbuf_addstr(&msg, "\nrename to ");
2195 quote_c_style(other, &msg, NULL, 0);
2196 strbuf_addch(&msg, '\n');
2197 break;
2198 case DIFF_STATUS_MODIFIED:
2199 if (p->score) {
2200 strbuf_addf(&msg, "dissimilarity index %d%%\n",
2201 similarity_index(p));
2202 complete_rewrite = 1;
2203 break;
2204 }
2205 /* fallthru */
2206 default:
2207 /* nothing */
2208 ;
2209 }
2211 if (hashcmp(one->sha1, two->sha1)) {
2212 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2214 if (DIFF_OPT_TST(o, BINARY)) {
2215 mmfile_t mf;
2216 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2217 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2218 abbrev = 40;
2219 }
2220 strbuf_addf(&msg, "index %.*s..%.*s",
2221 abbrev, sha1_to_hex(one->sha1),
2222 abbrev, sha1_to_hex(two->sha1));
2223 if (one->mode == two->mode)
2224 strbuf_addf(&msg, " %06o", one->mode);
2225 strbuf_addch(&msg, '\n');
2226 }
2228 if (msg.len)
2229 strbuf_setlen(&msg, msg.len - 1);
2230 xfrm_msg = msg.len ? msg.buf : NULL;
2232 if (!pgm &&
2233 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2234 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2235 /* a filepair that changes between file and symlink
2236 * needs to be split into deletion and creation.
2237 */
2238 struct diff_filespec *null = alloc_filespec(two->path);
2239 run_diff_cmd(NULL, name, other, attr_path,
2240 one, null, xfrm_msg, o, 0);
2241 free(null);
2242 null = alloc_filespec(one->path);
2243 run_diff_cmd(NULL, name, other, attr_path,
2244 null, two, xfrm_msg, o, 0);
2245 free(null);
2246 }
2247 else
2248 run_diff_cmd(pgm, name, other, attr_path,
2249 one, two, xfrm_msg, o, complete_rewrite);
2251 strbuf_release(&msg);
2252 }
2254 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2255 struct diffstat_t *diffstat)
2256 {
2257 const char *name;
2258 const char *other;
2259 int complete_rewrite = 0;
2261 if (DIFF_PAIR_UNMERGED(p)) {
2262 /* unmerged */
2263 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2264 return;
2265 }
2267 name = p->one->path;
2268 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2270 if (o->prefix_length)
2271 strip_prefix(o->prefix_length, &name, &other);
2273 diff_fill_sha1_info(p->one);
2274 diff_fill_sha1_info(p->two);
2276 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2277 complete_rewrite = 1;
2278 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2279 }
2281 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2282 {
2283 const char *name;
2284 const char *other;
2285 const char *attr_path;
2287 if (DIFF_PAIR_UNMERGED(p)) {
2288 /* unmerged */
2289 return;
2290 }
2292 name = p->one->path;
2293 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2294 attr_path = other ? other : name;
2296 if (o->prefix_length)
2297 strip_prefix(o->prefix_length, &name, &other);
2299 diff_fill_sha1_info(p->one);
2300 diff_fill_sha1_info(p->two);
2302 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2303 }
2305 void diff_setup(struct diff_options *options)
2306 {
2307 memset(options, 0, sizeof(*options));
2309 options->file = stdout;
2311 options->line_termination = '\n';
2312 options->break_opt = -1;
2313 options->rename_limit = -1;
2314 options->dirstat_percent = 3;
2315 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
2316 options->context = 3;
2318 options->change = diff_change;
2319 options->add_remove = diff_addremove;
2320 if (diff_use_color_default > 0)
2321 DIFF_OPT_SET(options, COLOR_DIFF);
2322 else
2323 DIFF_OPT_CLR(options, COLOR_DIFF);
2324 options->detect_rename = diff_detect_rename_default;
2326 if (!diff_mnemonic_prefix) {
2327 options->a_prefix = "a/";
2328 options->b_prefix = "b/";
2329 }
2330 }
2332 int diff_setup_done(struct diff_options *options)
2333 {
2334 int count = 0;
2336 if (options->output_format & DIFF_FORMAT_NAME)
2337 count++;
2338 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2339 count++;
2340 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2341 count++;
2342 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2343 count++;
2344 if (count > 1)
2345 die("--name-only, --name-status, --check and -s are mutually exclusive");
2347 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2348 options->detect_rename = DIFF_DETECT_COPY;
2350 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2351 options->prefix = NULL;
2352 if (options->prefix)
2353 options->prefix_length = strlen(options->prefix);
2354 else
2355 options->prefix_length = 0;
2357 if (options->output_format & (DIFF_FORMAT_NAME |
2358 DIFF_FORMAT_NAME_STATUS |
2359 DIFF_FORMAT_CHECKDIFF |
2360 DIFF_FORMAT_NO_OUTPUT))
2361 options->output_format &= ~(DIFF_FORMAT_RAW |
2362 DIFF_FORMAT_NUMSTAT |
2363 DIFF_FORMAT_DIFFSTAT |
2364 DIFF_FORMAT_SHORTSTAT |
2365 DIFF_FORMAT_DIRSTAT |
2366 DIFF_FORMAT_SUMMARY |
2367 DIFF_FORMAT_PATCH);
2369 /*
2370 * These cases always need recursive; we do not drop caller-supplied
2371 * recursive bits for other formats here.
2372 */
2373 if (options->output_format & (DIFF_FORMAT_PATCH |
2374 DIFF_FORMAT_NUMSTAT |
2375 DIFF_FORMAT_DIFFSTAT |
2376 DIFF_FORMAT_SHORTSTAT |
2377 DIFF_FORMAT_DIRSTAT |
2378 DIFF_FORMAT_SUMMARY |
2379 DIFF_FORMAT_CHECKDIFF))
2380 DIFF_OPT_SET(options, RECURSIVE);
2381 /*
2382 * Also pickaxe would not work very well if you do not say recursive
2383 */
2384 if (options->pickaxe)
2385 DIFF_OPT_SET(options, RECURSIVE);
2387 if (options->detect_rename && options->rename_limit < 0)
2388 options->rename_limit = diff_rename_limit_default;
2389 if (options->setup & DIFF_SETUP_USE_CACHE) {
2390 if (!active_cache)
2391 /* read-cache does not die even when it fails
2392 * so it is safe for us to do this here. Also
2393 * it does not smudge active_cache or active_nr
2394 * when it fails, so we do not have to worry about
2395 * cleaning it up ourselves either.
2396 */
2397 read_cache();
2398 }
2399 if (options->abbrev <= 0 || 40 < options->abbrev)
2400 options->abbrev = 40; /* full */
2402 /*
2403 * It does not make sense to show the first hit we happened
2404 * to have found. It does not make sense not to return with
2405 * exit code in such a case either.
2406 */
2407 if (DIFF_OPT_TST(options, QUIET)) {
2408 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2409 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2410 }
2412 return 0;
2413 }
2415 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2416 {
2417 char c, *eq;
2418 int len;
2420 if (*arg != '-')
2421 return 0;
2422 c = *++arg;
2423 if (!c)
2424 return 0;
2425 if (c == arg_short) {
2426 c = *++arg;
2427 if (!c)
2428 return 1;
2429 if (val && isdigit(c)) {
2430 char *end;
2431 int n = strtoul(arg, &end, 10);
2432 if (*end)
2433 return 0;
2434 *val = n;
2435 return 1;
2436 }
2437 return 0;
2438 }
2439 if (c != '-')
2440 return 0;
2441 arg++;
2442 eq = strchr(arg, '=');
2443 if (eq)
2444 len = eq - arg;
2445 else
2446 len = strlen(arg);
2447 if (!len || strncmp(arg, arg_long, len))
2448 return 0;
2449 if (eq) {
2450 int n;
2451 char *end;
2452 if (!isdigit(*++eq))
2453 return 0;
2454 n = strtoul(eq, &end, 10);
2455 if (*end)
2456 return 0;
2457 *val = n;
2458 }
2459 return 1;
2460 }
2462 static int diff_scoreopt_parse(const char *opt);
2464 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2465 {
2466 const char *arg = av[0];
2468 /* Output format options */
2469 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2470 options->output_format |= DIFF_FORMAT_PATCH;
2471 else if (opt_arg(arg, 'U', "unified", &options->context))
2472 options->output_format |= DIFF_FORMAT_PATCH;
2473 else if (!strcmp(arg, "--raw"))
2474 options->output_format |= DIFF_FORMAT_RAW;
2475 else if (!strcmp(arg, "--patch-with-raw"))
2476 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2477 else if (!strcmp(arg, "--numstat"))
2478 options->output_format |= DIFF_FORMAT_NUMSTAT;
2479 else if (!strcmp(arg, "--shortstat"))
2480 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2481 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2482 options->output_format |= DIFF_FORMAT_DIRSTAT;
2483 else if (!strcmp(arg, "--cumulative")) {
2484 options->output_format |= DIFF_FORMAT_DIRSTAT;
2485 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
2486 } else if (opt_arg(arg, 0, "dirstat-by-file",
2487 &options->dirstat_percent)) {
2488 options->output_format |= DIFF_FORMAT_DIRSTAT;
2489 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
2490 }
2491 else if (!strcmp(arg, "--check"))
2492 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2493 else if (!strcmp(arg, "--summary"))
2494 options->output_format |= DIFF_FORMAT_SUMMARY;
2495 else if (!strcmp(arg, "--patch-with-stat"))
2496 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2497 else if (!strcmp(arg, "--name-only"))
2498 options->output_format |= DIFF_FORMAT_NAME;
2499 else if (!strcmp(arg, "--name-status"))
2500 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2501 else if (!strcmp(arg, "-s"))
2502 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2503 else if (!prefixcmp(arg, "--stat")) {
2504 char *end;
2505 int width = options->stat_width;
2506 int name_width = options->stat_name_width;
2507 arg += 6;
2508 end = (char *)arg;
2510 switch (*arg) {
2511 case '-':
2512 if (!prefixcmp(arg, "-width="))
2513 width = strtoul(arg + 7, &end, 10);
2514 else if (!prefixcmp(arg, "-name-width="))
2515 name_width = strtoul(arg + 12, &end, 10);
2516 break;
2517 case '=':
2518 width = strtoul(arg+1, &end, 10);
2519 if (*end == ',')
2520 name_width = strtoul(end+1, &end, 10);
2521 }
2523 /* Important! This checks all the error cases! */
2524 if (*end)
2525 return 0;
2526 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2527 options->stat_name_width = name_width;
2528 options->stat_width = width;
2529 }
2531 /* renames options */
2532 else if (!prefixcmp(arg, "-B")) {
2533 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2534 return -1;
2535 }
2536 else if (!prefixcmp(arg, "-M")) {
2537 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2538 return -1;
2539 options->detect_rename = DIFF_DETECT_RENAME;
2540 }
2541 else if (!prefixcmp(arg, "-C")) {
2542 if (options->detect_rename == DIFF_DETECT_COPY)
2543 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2544 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2545 return -1;
2546 options->detect_rename = DIFF_DETECT_COPY;
2547 }
2548 else if (!strcmp(arg, "--no-renames"))
2549 options->detect_rename = 0;
2550 else if (!strcmp(arg, "--relative"))
2551 DIFF_OPT_SET(options, RELATIVE_NAME);
2552 else if (!prefixcmp(arg, "--relative=")) {
2553 DIFF_OPT_SET(options, RELATIVE_NAME);
2554 options->prefix = arg + 11;
2555 }
2557 /* xdiff options */
2558 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2559 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2560 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2561 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2562 else if (!strcmp(arg, "--ignore-space-at-eol"))
2563 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2564 else if (!strcmp(arg, "--patience"))
2565 options->xdl_opts |= XDF_PATIENCE_DIFF;
2567 /* flags options */
2568 else if (!strcmp(arg, "--binary")) {
2569 options->output_format |= DIFF_FORMAT_PATCH;
2570 DIFF_OPT_SET(options, BINARY);
2571 }
2572 else if (!strcmp(arg, "--full-index"))
2573 DIFF_OPT_SET(options, FULL_INDEX);
2574 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2575 DIFF_OPT_SET(options, TEXT);
2576 else if (!strcmp(arg, "-R"))
2577 DIFF_OPT_SET(options, REVERSE_DIFF);
2578 else if (!strcmp(arg, "--find-copies-harder"))
2579 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2580 else if (!strcmp(arg, "--follow"))
2581 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2582 else if (!strcmp(arg, "--color"))
2583 DIFF_OPT_SET(options, COLOR_DIFF);
2584 else if (!strcmp(arg, "--no-color"))
2585 DIFF_OPT_CLR(options, COLOR_DIFF);
2586 else if (!strcmp(arg, "--color-words"))
2587 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2588 else if (!prefixcmp(arg, "--color-words=")) {
2589 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2590 options->word_regex = arg + 14;
2591 }
2592 else if (!strcmp(arg, "--exit-code"))
2593 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2594 else if (!strcmp(arg, "--quiet"))
2595 DIFF_OPT_SET(options, QUIET);
2596 else if (!strcmp(arg, "--ext-diff"))
2597 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2598 else if (!strcmp(arg, "--no-ext-diff"))
2599 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2600 else if (!strcmp(arg, "--textconv"))
2601 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
2602 else if (!strcmp(arg, "--no-textconv"))
2603 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
2604 else if (!strcmp(arg, "--ignore-submodules"))
2605 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2607 /* misc options */
2608 else if (!strcmp(arg, "-z"))
2609 options->line_termination = 0;
2610 else if (!prefixcmp(arg, "-l"))
2611 options->rename_limit = strtoul(arg+2, NULL, 10);
2612 else if (!prefixcmp(arg, "-S"))
2613 options->pickaxe = arg + 2;
2614 else if (!strcmp(arg, "--pickaxe-all"))
2615 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2616 else if (!strcmp(arg, "--pickaxe-regex"))
2617 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2618 else if (!prefixcmp(arg, "-O"))
2619 options->orderfile = arg + 2;
2620 else if (!prefixcmp(arg, "--diff-filter="))
2621 options->filter = arg + 14;
2622 else if (!strcmp(arg, "--abbrev"))
2623 options->abbrev = DEFAULT_ABBREV;
2624 else if (!prefixcmp(arg, "--abbrev=")) {
2625 options->abbrev = strtoul(arg + 9, NULL, 10);
2626 if (options->abbrev < MINIMUM_ABBREV)
2627 options->abbrev = MINIMUM_ABBREV;
2628 else if (40 < options->abbrev)
2629 options->abbrev = 40;
2630 }
2631 else if (!prefixcmp(arg, "--src-prefix="))
2632 options->a_prefix = arg + 13;
2633 else if (!prefixcmp(arg, "--dst-prefix="))
2634 options->b_prefix = arg + 13;
2635 else if (!strcmp(arg, "--no-prefix"))
2636 options->a_prefix = options->b_prefix = "";
2637 else if (opt_arg(arg, '\0', "inter-hunk-context",
2638 &options->interhunkcontext))
2639 ;
2640 else if (!prefixcmp(arg, "--output=")) {
2641 options->file = fopen(arg + strlen("--output="), "w");
2642 options->close_file = 1;
2643 } else
2644 return 0;
2645 return 1;
2646 }
2648 static int parse_num(const char **cp_p)
2649 {
2650 unsigned long num, scale;
2651 int ch, dot;
2652 const char *cp = *cp_p;
2654 num = 0;
2655 scale = 1;
2656 dot = 0;
2657 for(;;) {
2658 ch = *cp;
2659 if ( !dot && ch == '.' ) {
2660 scale = 1;
2661 dot = 1;
2662 } else if ( ch == '%' ) {
2663 scale = dot ? scale*100 : 100;
2664 cp++; /* % is always at the end */
2665 break;
2666 } else if ( ch >= '0' && ch <= '9' ) {
2667 if ( scale < 100000 ) {
2668 scale *= 10;
2669 num = (num*10) + (ch-'0');
2670 }
2671 } else {
2672 break;
2673 }
2674 cp++;
2675 }
2676 *cp_p = cp;
2678 /* user says num divided by scale and we say internally that
2679 * is MAX_SCORE * num / scale.
2680 */
2681 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2682 }
2684 static int diff_scoreopt_parse(const char *opt)
2685 {
2686 int opt1, opt2, cmd;
2688 if (*opt++ != '-')
2689 return -1;
2690 cmd = *opt++;
2691 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2692 return -1; /* that is not a -M, -C nor -B option */
2694 opt1 = parse_num(&opt);
2695 if (cmd != 'B')
2696 opt2 = 0;
2697 else {
2698 if (*opt == 0)
2699 opt2 = 0;
2700 else if (*opt != '/')
2701 return -1; /* we expect -B80/99 or -B80 */
2702 else {
2703 opt++;
2704 opt2 = parse_num(&opt);
2705 }
2706 }
2707 if (*opt != 0)
2708 return -1;
2709 return opt1 | (opt2 << 16);
2710 }
2712 struct diff_queue_struct diff_queued_diff;
2714 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2715 {
2716 if (queue->alloc <= queue->nr) {
2717 queue->alloc = alloc_nr(queue->alloc);
2718 queue->queue = xrealloc(queue->queue,
2719 sizeof(dp) * queue->alloc);
2720 }
2721 queue->queue[queue->nr++] = dp;
2722 }
2724 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2725 struct diff_filespec *one,
2726 struct diff_filespec *two)
2727 {
2728 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2729 dp->one = one;
2730 dp->two = two;
2731 if (queue)
2732 diff_q(queue, dp);
2733 return dp;
2734 }
2736 void diff_free_filepair(struct diff_filepair *p)
2737 {
2738 free_filespec(p->one);
2739 free_filespec(p->two);
2740 free(p);
2741 }
2743 /* This is different from find_unique_abbrev() in that
2744 * it stuffs the result with dots for alignment.
2745 */
2746 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2747 {
2748 int abblen;
2749 const char *abbrev;
2750 if (len == 40)
2751 return sha1_to_hex(sha1);
2753 abbrev = find_unique_abbrev(sha1, len);
2754 abblen = strlen(abbrev);
2755 if (abblen < 37) {
2756 static char hex[41];
2757 if (len < abblen && abblen <= len + 2)
2758 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2759 else
2760 sprintf(hex, "%s...", abbrev);
2761 return hex;
2762 }
2763 return sha1_to_hex(sha1);
2764 }
2766 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2767 {
2768 int line_termination = opt->line_termination;
2769 int inter_name_termination = line_termination ? '\t' : '\0';
2771 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2772 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2773 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2774 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2775 }
2776 if (p->score) {
2777 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2778 inter_name_termination);
2779 } else {
2780 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
2781 }
2783 if (p->status == DIFF_STATUS_COPIED ||
2784 p->status == DIFF_STATUS_RENAMED) {
2785 const char *name_a, *name_b;
2786 name_a = p->one->path;
2787 name_b = p->two->path;
2788 strip_prefix(opt->prefix_length, &name_a, &name_b);
2789 write_name_quoted(name_a, opt->file, inter_name_termination);
2790 write_name_quoted(name_b, opt->file, line_termination);
2791 } else {
2792 const char *name_a, *name_b;
2793 name_a = p->one->mode ? p->one->path : p->two->path;
2794 name_b = NULL;
2795 strip_prefix(opt->prefix_length, &name_a, &name_b);
2796 write_name_quoted(name_a, opt->file, line_termination);
2797 }
2798 }
2800 int diff_unmodified_pair(struct diff_filepair *p)
2801 {
2802 /* This function is written stricter than necessary to support
2803 * the currently implemented transformers, but the idea is to
2804 * let transformers to produce diff_filepairs any way they want,
2805 * and filter and clean them up here before producing the output.
2806 */
2807 struct diff_filespec *one = p->one, *two = p->two;
2809 if (DIFF_PAIR_UNMERGED(p))
2810 return 0; /* unmerged is interesting */
2812 /* deletion, addition, mode or type change
2813 * and rename are all interesting.
2814 */
2815 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2816 DIFF_PAIR_MODE_CHANGED(p) ||
2817 strcmp(one->path, two->path))
2818 return 0;
2820 /* both are valid and point at the same path. that is, we are
2821 * dealing with a change.
2822 */
2823 if (one->sha1_valid && two->sha1_valid &&
2824 !hashcmp(one->sha1, two->sha1))
2825 return 1; /* no change */
2826 if (!one->sha1_valid && !two->sha1_valid)
2827 return 1; /* both look at the same file on the filesystem. */
2828 return 0;
2829 }
2831 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2832 {
2833 if (diff_unmodified_pair(p))
2834 return;
2836 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2837 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2838 return; /* no tree diffs in patch format */
2840 run_diff(p, o);
2841 }
2843 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2844 struct diffstat_t *diffstat)
2845 {
2846 if (diff_unmodified_pair(p))
2847 return;
2849 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2850 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2851 return; /* no tree diffs in patch format */
2853 run_diffstat(p, o, diffstat);
2854 }
2856 static void diff_flush_checkdiff(struct diff_filepair *p,
2857 struct diff_options *o)
2858 {
2859 if (diff_unmodified_pair(p))
2860 return;
2862 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2863 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2864 return; /* no tree diffs in patch format */
2866 run_checkdiff(p, o);
2867 }
2869 int diff_queue_is_empty(void)
2870 {
2871 struct diff_queue_struct *q = &diff_queued_diff;
2872 int i;
2873 for (i = 0; i < q->nr; i++)
2874 if (!diff_unmodified_pair(q->queue[i]))
2875 return 0;
2876 return 1;
2877 }
2879 #if DIFF_DEBUG
2880 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2881 {
2882 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2883 x, one ? one : "",
2884 s->path,
2885 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2886 s->mode,
2887 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2888 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2889 x, one ? one : "",
2890 s->size, s->xfrm_flags);
2891 }
2893 void diff_debug_filepair(const struct diff_filepair *p, int i)
2894 {
2895 diff_debug_filespec(p->one, i, "one");
2896 diff_debug_filespec(p->two, i, "two");
2897 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2898 p->score, p->status ? p->status : '?',
2899 p->one->rename_used, p->broken_pair);
2900 }
2902 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2903 {
2904 int i;
2905 if (msg)
2906 fprintf(stderr, "%s\n", msg);
2907 fprintf(stderr, "q->nr = %d\n", q->nr);
2908 for (i = 0; i < q->nr; i++) {
2909 struct diff_filepair *p = q->queue[i];
2910 diff_debug_filepair(p, i);
2911 }
2912 }
2913 #endif
2915 static void diff_resolve_rename_copy(void)
2916 {
2917 int i;
2918 struct diff_filepair *p;
2919 struct diff_queue_struct *q = &diff_queued_diff;
2921 diff_debug_queue("resolve-rename-copy", q);
2923 for (i = 0; i < q->nr; i++) {
2924 p = q->queue[i];
2925 p->status = 0; /* undecided */
2926 if (DIFF_PAIR_UNMERGED(p))
2927 p->status = DIFF_STATUS_UNMERGED;
2928 else if (!DIFF_FILE_VALID(p->one))
2929 p->status = DIFF_STATUS_ADDED;
2930 else if (!DIFF_FILE_VALID(p->two))
2931 p->status = DIFF_STATUS_DELETED;
2932 else if (DIFF_PAIR_TYPE_CHANGED(p))
2933 p->status = DIFF_STATUS_TYPE_CHANGED;
2935 /* from this point on, we are dealing with a pair
2936 * whose both sides are valid and of the same type, i.e.
2937 * either in-place edit or rename/copy edit.
2938 */
2939 else if (DIFF_PAIR_RENAME(p)) {
2940 /*
2941 * A rename might have re-connected a broken
2942 * pair up, causing the pathnames to be the
2943 * same again. If so, that's not a rename at
2944 * all, just a modification..
2945 *
2946 * Otherwise, see if this source was used for
2947 * multiple renames, in which case we decrement
2948 * the count, and call it a copy.
2949 */
2950 if (!strcmp(p->one->path, p->two->path))
2951 p->status = DIFF_STATUS_MODIFIED;
2952 else if (--p->one->rename_used > 0)
2953 p->status = DIFF_STATUS_COPIED;
2954 else
2955 p->status = DIFF_STATUS_RENAMED;
2956 }
2957 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2958 p->one->mode != p->two->mode ||
2959 is_null_sha1(p->one->sha1))
2960 p->status = DIFF_STATUS_MODIFIED;
2961 else {
2962 /* This is a "no-change" entry and should not
2963 * happen anymore, but prepare for broken callers.
2964 */
2965 error("feeding unmodified %s to diffcore",
2966 p->one->path);
2967 p->status = DIFF_STATUS_UNKNOWN;
2968 }
2969 }
2970 diff_debug_queue("resolve-rename-copy done", q);
2971 }
2973 static int check_pair_status(struct diff_filepair *p)
2974 {
2975 switch (p->status) {
2976 case DIFF_STATUS_UNKNOWN:
2977 return 0;
2978 case 0:
2979 die("internal error in diff-resolve-rename-copy");
2980 default:
2981 return 1;
2982 }
2983 }
2985 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2986 {
2987 int fmt = opt->output_format;
2989 if (fmt & DIFF_FORMAT_CHECKDIFF)
2990 diff_flush_checkdiff(p, opt);
2991 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2992 diff_flush_raw(p, opt);
2993 else if (fmt & DIFF_FORMAT_NAME) {
2994 const char *name_a, *name_b;
2995 name_a = p->two->path;
2996 name_b = NULL;
2997 strip_prefix(opt->prefix_length, &name_a, &name_b);
2998 write_name_quoted(name_a, opt->file, opt->line_termination);
2999 }
3000 }
3002 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3003 {
3004 if (fs->mode)
3005 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3006 else
3007 fprintf(file, " %s ", newdelete);
3008 write_name_quoted(fs->path, file, '\n');
3009 }
3012 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
3013 {
3014 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3015 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
3016 show_name ? ' ' : '\n');
3017 if (show_name) {
3018 write_name_quoted(p->two->path, file, '\n');
3019 }
3020 }
3021 }
3023 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
3024 {
3025 char *names = pprint_rename(p->one->path, p->two->path);
3027 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3028 free(names);
3029 show_mode_change(file, p, 0);
3030 }
3032 static void diff_summary(FILE *file, struct diff_filepair *p)
3033 {
3034 switch(p->status) {
3035 case DIFF_STATUS_DELETED:
3036 show_file_mode_name(file, "delete", p->one);
3037 break;
3038 case DIFF_STATUS_ADDED:
3039 show_file_mode_name(file, "create", p->two);
3040 break;
3041 case DIFF_STATUS_COPIED:
3042 show_rename_copy(file, "copy", p);
3043 break;
3044 case DIFF_STATUS_RENAMED:
3045 show_rename_copy(file, "rename", p);
3046 break;
3047 default:
3048 if (p->score) {
3049 fputs(" rewrite ", file);
3050 write_name_quoted(p->two->path, file, ' ');
3051 fprintf(file, "(%d%%)\n", similarity_index(p));
3052 }
3053 show_mode_change(file, p, !p->score);
3054 break;
3055 }
3056 }
3058 struct patch_id_t {
3059 git_SHA_CTX *ctx;
3060 int patchlen;
3061 };
3063 static int remove_space(char *line, int len)
3064 {
3065 int i;
3066 char *dst = line;
3067 unsigned char c;
3069 for (i = 0; i < len; i++)
3070 if (!isspace((c = line[i])))
3071 *dst++ = c;
3073 return dst - line;
3074 }
3076 static void patch_id_consume(void *priv, char *line, unsigned long len)
3077 {
3078 struct patch_id_t *data = priv;
3079 int new_len;
3081 /* Ignore line numbers when computing the SHA1 of the patch */
3082 if (!prefixcmp(line, "@@ -"))
3083 return;
3085 new_len = remove_space(line, len);
3087 git_SHA1_Update(data->ctx, line, new_len);
3088 data->patchlen += new_len;
3089 }
3091 /* returns 0 upon success, and writes result into sha1 */
3092 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3093 {
3094 struct diff_queue_struct *q = &diff_queued_diff;
3095 int i;
3096 git_SHA_CTX ctx;
3097 struct patch_id_t data;
3098 char buffer[PATH_MAX * 4 + 20];
3100 git_SHA1_Init(&ctx);
3101 memset(&data, 0, sizeof(struct patch_id_t));
3102 data.ctx = &ctx;
3104 for (i = 0; i < q->nr; i++) {
3105 xpparam_t xpp;
3106 xdemitconf_t xecfg;
3107 xdemitcb_t ecb;
3108 mmfile_t mf1, mf2;
3109 struct diff_filepair *p = q->queue[i];
3110 int len1, len2;
3112 memset(&xpp, 0, sizeof(xpp));
3113 memset(&xecfg, 0, sizeof(xecfg));
3114 if (p->status == 0)
3115 return error("internal diff status error");
3116 if (p->status == DIFF_STATUS_UNKNOWN)
3117 continue;
3118 if (diff_unmodified_pair(p))
3119 continue;
3120 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3121 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3122 continue;
3123 if (DIFF_PAIR_UNMERGED(p))
3124 continue;
3126 diff_fill_sha1_info(p->one);
3127 diff_fill_sha1_info(p->two);
3128 if (fill_mmfile(&mf1, p->one) < 0 ||
3129 fill_mmfile(&mf2, p->two) < 0)
3130 return error("unable to read files to diff");
3132 len1 = remove_space(p->one->path, strlen(p->one->path));
3133 len2 = remove_space(p->two->path, strlen(p->two->path));
3134 if (p->one->mode == 0)
3135 len1 = snprintf(buffer, sizeof(buffer),
3136 "diff--gita/%.*sb/%.*s"
3137 "newfilemode%06o"
3138 "---/dev/null"
3139 "+++b/%.*s",
3140 len1, p->one->path,
3141 len2, p->two->path,
3142 p->two->mode,
3143 len2, p->two->path);
3144 else if (p->two->mode == 0)
3145 len1 = snprintf(buffer, sizeof(buffer),
3146 "diff--gita/%.*sb/%.*s"
3147 "deletedfilemode%06o"
3148 "---a/%.*s"
3149 "+++/dev/null",
3150 len1, p->one->path,
3151 len2, p->two->path,
3152 p->one->mode,
3153 len1, p->one->path);
3154 else
3155 len1 = snprintf(buffer, sizeof(buffer),
3156 "diff--gita/%.*sb/%.*s"
3157 "---a/%.*s"
3158 "+++b/%.*s",
3159 len1, p->one->path,
3160 len2, p->two->path,
3161 len1, p->one->path,
3162 len2, p->two->path);
3163 git_SHA1_Update(&ctx, buffer, len1);
3165 xpp.flags = XDF_NEED_MINIMAL;
3166 xecfg.ctxlen = 3;
3167 xecfg.flags = XDL_EMIT_FUNCNAMES;
3168 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3169 &xpp, &xecfg, &ecb);
3170 }
3172 git_SHA1_Final(sha1, &ctx);
3173 return 0;
3174 }
3176 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3177 {
3178 struct diff_queue_struct *q = &diff_queued_diff;
3179 int i;
3180 int result = diff_get_patch_id(options, sha1);
3182 for (i = 0; i < q->nr; i++)
3183 diff_free_filepair(q->queue[i]);
3185 free(q->queue);
3186 q->queue = NULL;
3187 q->nr = q->alloc = 0;
3189 return result;
3190 }
3192 static int is_summary_empty(const struct diff_queue_struct *q)
3193 {
3194 int i;
3196 for (i = 0; i < q->nr; i++) {
3197 const struct diff_filepair *p = q->queue[i];
3199 switch (p->status) {
3200 case DIFF_STATUS_DELETED:
3201 case DIFF_STATUS_ADDED:
3202 case DIFF_STATUS_COPIED:
3203 case DIFF_STATUS_RENAMED:
3204 return 0;
3205 default:
3206 if (p->score)
3207 return 0;
3208 if (p->one->mode && p->two->mode &&
3209 p->one->mode != p->two->mode)
3210 return 0;
3211 break;
3212 }
3213 }
3214 return 1;
3215 }
3217 void diff_flush(struct diff_options *options)
3218 {
3219 struct diff_queue_struct *q = &diff_queued_diff;
3220 int i, output_format = options->output_format;
3221 int separator = 0;
3223 /*
3224 * Order: raw, stat, summary, patch
3225 * or: name/name-status/checkdiff (other bits clear)
3226 */
3227 if (!q->nr)
3228 goto free_queue;
3230 if (output_format & (DIFF_FORMAT_RAW |
3231 DIFF_FORMAT_NAME |
3232 DIFF_FORMAT_NAME_STATUS |
3233 DIFF_FORMAT_CHECKDIFF)) {
3234 for (i = 0; i < q->nr; i++) {
3235 struct diff_filepair *p = q->queue[i];
3236 if (check_pair_status(p))
3237 flush_one_pair(p, options);
3238 }
3239 separator++;
3240 }
3242 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3243 struct diffstat_t diffstat;
3245 memset(&diffstat, 0, sizeof(struct diffstat_t));
3246 for (i = 0; i < q->nr; i++) {
3247 struct diff_filepair *p = q->queue[i];
3248 if (check_pair_status(p))
3249 diff_flush_stat(p, options, &diffstat);
3250 }
3251 if (output_format & DIFF_FORMAT_NUMSTAT)
3252 show_numstat(&diffstat, options);
3253 if (output_format & DIFF_FORMAT_DIFFSTAT)
3254 show_stats(&diffstat, options);
3255 if (output_format & DIFF_FORMAT_SHORTSTAT)
3256 show_shortstats(&diffstat, options);
3257 free_diffstat_info(&diffstat);
3258 separator++;
3259 }
3260 if (output_format & DIFF_FORMAT_DIRSTAT)
3261 show_dirstat(options);
3263 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3264 for (i = 0; i < q->nr; i++)
3265 diff_summary(options->file, q->queue[i]);
3266 separator++;
3267 }
3269 if (output_format & DIFF_FORMAT_PATCH) {
3270 if (separator) {
3271 putc(options->line_termination, options->file);
3272 if (options->stat_sep) {
3273 /* attach patch instead of inline */
3274 fputs(options->stat_sep, options->file);
3275 }
3276 }
3278 for (i = 0; i < q->nr; i++) {
3279 struct diff_filepair *p = q->queue[i];
3280 if (check_pair_status(p))
3281 diff_flush_patch(p, options);
3282 }
3283 }
3285 if (output_format & DIFF_FORMAT_CALLBACK)
3286 options->format_callback(q, options, options->format_callback_data);
3288 for (i = 0; i < q->nr; i++)
3289 diff_free_filepair(q->queue[i]);
3290 free_queue:
3291 free(q->queue);
3292 q->queue = NULL;
3293 q->nr = q->alloc = 0;
3294 if (options->close_file)
3295 fclose(options->file);
3296 }
3298 static void diffcore_apply_filter(const char *filter)
3299 {
3300 int i;
3301 struct diff_queue_struct *q = &diff_queued_diff;
3302 struct diff_queue_struct outq;
3303 outq.queue = NULL;
3304 outq.nr = outq.alloc = 0;
3306 if (!filter)
3307 return;
3309 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3310 int found;
3311 for (i = found = 0; !found && i < q->nr; i++) {
3312 struct diff_filepair *p = q->queue[i];
3313 if (((p->status == DIFF_STATUS_MODIFIED) &&
3314 ((p->score &&
3315 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3316 (!p->score &&
3317 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3318 ((p->status != DIFF_STATUS_MODIFIED) &&
3319 strchr(filter, p->status)))
3320 found++;
3321 }
3322 if (found)
3323 return;
3325 /* otherwise we will clear the whole queue
3326 * by copying the empty outq at the end of this
3327 * function, but first clear the current entries
3328 * in the queue.
3329 */
3330 for (i = 0; i < q->nr; i++)
3331 diff_free_filepair(q->queue[i]);
3332 }
3333 else {
3334 /* Only the matching ones */
3335 for (i = 0; i < q->nr; i++) {
3336 struct diff_filepair *p = q->queue[i];
3338 if (((p->status == DIFF_STATUS_MODIFIED) &&
3339 ((p->score &&
3340 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3341 (!p->score &&
3342 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3343 ((p->status != DIFF_STATUS_MODIFIED) &&
3344 strchr(filter, p->status)))
3345 diff_q(&outq, p);
3346 else
3347 diff_free_filepair(p);
3348 }
3349 }
3350 free(q->queue);
3351 *q = outq;
3352 }
3354 /* Check whether two filespecs with the same mode and size are identical */
3355 static int diff_filespec_is_identical(struct diff_filespec *one,
3356 struct diff_filespec *two)
3357 {
3358 if (S_ISGITLINK(one->mode))
3359 return 0;
3360 if (diff_populate_filespec(one, 0))
3361 return 0;
3362 if (diff_populate_filespec(two, 0))
3363 return 0;
3364 return !memcmp(one->data, two->data, one->size);
3365 }
3367 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3368 {
3369 int i;
3370 struct diff_queue_struct *q = &diff_queued_diff;
3371 struct diff_queue_struct outq;
3372 outq.queue = NULL;
3373 outq.nr = outq.alloc = 0;
3375 for (i = 0; i < q->nr; i++) {
3376 struct diff_filepair *p = q->queue[i];
3378 /*
3379 * 1. Entries that come from stat info dirtyness
3380 * always have both sides (iow, not create/delete),
3381 * one side of the object name is unknown, with
3382 * the same mode and size. Keep the ones that
3383 * do not match these criteria. They have real
3384 * differences.
3385 *
3386 * 2. At this point, the file is known to be modified,
3387 * with the same mode and size, and the object
3388 * name of one side is unknown. Need to inspect
3389 * the identical contents.
3390 */
3391 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3392 !DIFF_FILE_VALID(p->two) ||
3393 (p->one->sha1_valid && p->two->sha1_valid) ||
3394 (p->one->mode != p->two->mode) ||
3395 diff_populate_filespec(p->one, 1) ||
3396 diff_populate_filespec(p->two, 1) ||
3397 (p->one->size != p->two->size) ||
3398 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3399 diff_q(&outq, p);
3400 else {
3401 /*
3402 * The caller can subtract 1 from skip_stat_unmatch
3403 * to determine how many paths were dirty only
3404 * due to stat info mismatch.
3405 */
3406 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3407 diffopt->skip_stat_unmatch++;
3408 diff_free_filepair(p);
3409 }
3410 }
3411 free(q->queue);
3412 *q = outq;
3413 }
3415 void diffcore_std(struct diff_options *options)
3416 {
3417 if (options->skip_stat_unmatch)
3418 diffcore_skip_stat_unmatch(options);
3419 if (options->break_opt != -1)
3420 diffcore_break(options->break_opt);
3421 if (options->detect_rename)
3422 diffcore_rename(options);
3423 if (options->break_opt != -1)
3424 diffcore_merge_broken();
3425 if (options->pickaxe)
3426 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3427 if (options->orderfile)
3428 diffcore_order(options->orderfile);
3429 diff_resolve_rename_copy();
3430 diffcore_apply_filter(options->filter);
3432 if (diff_queued_diff.nr)
3433 DIFF_OPT_SET(options, HAS_CHANGES);
3434 else
3435 DIFF_OPT_CLR(options, HAS_CHANGES);
3436 }
3438 int diff_result_code(struct diff_options *opt, int status)
3439 {
3440 int result = 0;
3441 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3442 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3443 return status;
3444 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3445 DIFF_OPT_TST(opt, HAS_CHANGES))
3446 result |= 01;
3447 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3448 DIFF_OPT_TST(opt, CHECK_FAILED))
3449 result |= 02;
3450 return result;
3451 }
3453 void diff_addremove(struct diff_options *options,
3454 int addremove, unsigned mode,
3455 const unsigned char *sha1,
3456 const char *concatpath)
3457 {
3458 struct diff_filespec *one, *two;
3460 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3461 return;
3463 /* This may look odd, but it is a preparation for
3464 * feeding "there are unchanged files which should
3465 * not produce diffs, but when you are doing copy
3466 * detection you would need them, so here they are"
3467 * entries to the diff-core. They will be prefixed
3468 * with something like '=' or '*' (I haven't decided
3469 * which but should not make any difference).
3470 * Feeding the same new and old to diff_change()
3471 * also has the same effect.
3472 * Before the final output happens, they are pruned after
3473 * merged into rename/copy pairs as appropriate.
3474 */
3475 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3476 addremove = (addremove == '+' ? '-' :
3477 addremove == '-' ? '+' : addremove);
3479 if (options->prefix &&
3480 strncmp(concatpath, options->prefix, options->prefix_length))
3481 return;
3483 one = alloc_filespec(concatpath);
3484 two = alloc_filespec(concatpath);
3486 if (addremove != '+')
3487 fill_filespec(one, sha1, mode);
3488 if (addremove != '-')
3489 fill_filespec(two, sha1, mode);
3491 diff_queue(&diff_queued_diff, one, two);
3492 DIFF_OPT_SET(options, HAS_CHANGES);
3493 }
3495 void diff_change(struct diff_options *options,
3496 unsigned old_mode, unsigned new_mode,
3497 const unsigned char *old_sha1,
3498 const unsigned char *new_sha1,
3499 const char *concatpath)
3500 {
3501 struct diff_filespec *one, *two;
3503 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3504 && S_ISGITLINK(new_mode))
3505 return;
3507 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3508 unsigned tmp;
3509 const unsigned char *tmp_c;
3510 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3511 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3512 }
3514 if (options->prefix &&
3515 strncmp(concatpath, options->prefix, options->prefix_length))
3516 return;
3518 one = alloc_filespec(concatpath);
3519 two = alloc_filespec(concatpath);
3520 fill_filespec(one, old_sha1, old_mode);
3521 fill_filespec(two, new_sha1, new_mode);
3523 diff_queue(&diff_queued_diff, one, two);
3524 DIFF_OPT_SET(options, HAS_CHANGES);
3525 }
3527 void diff_unmerge(struct diff_options *options,
3528 const char *path,
3529 unsigned mode, const unsigned char *sha1)
3530 {
3531 struct diff_filespec *one, *two;
3533 if (options->prefix &&
3534 strncmp(path, options->prefix, options->prefix_length))
3535 return;
3537 one = alloc_filespec(path);
3538 two = alloc_filespec(path);
3539 fill_filespec(one, sha1, mode);
3540 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3541 }
3543 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
3544 size_t *outsize)
3545 {
3546 struct diff_tempfile *temp;
3547 const char *argv[3];
3548 const char **arg = argv;
3549 struct child_process child;
3550 struct strbuf buf = STRBUF_INIT;
3552 temp = prepare_temp_file(spec->path, spec);
3553 *arg++ = pgm;
3554 *arg++ = temp->name;
3555 *arg = NULL;
3557 memset(&child, 0, sizeof(child));
3558 child.argv = argv;
3559 child.out = -1;
3560 if (start_command(&child) != 0 ||
3561 strbuf_read(&buf, child.out, 0) < 0 ||
3562 finish_command(&child) != 0) {
3563 remove_tempfile();
3564 error("error running textconv command '%s'", pgm);
3565 return NULL;
3566 }
3567 remove_tempfile();
3569 return strbuf_detach(&buf, outsize);
3570 }