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50277b82b2289395fd11a3d5b4d63cf45f825a51
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"
16 #ifdef NO_FAST_WORKING_DIRECTORY
17 #define FAST_WORKING_DIRECTORY 0
18 #else
19 #define FAST_WORKING_DIRECTORY 1
20 #endif
22 static int diff_detect_rename_default;
23 static int diff_rename_limit_default = 200;
24 static int diff_suppress_blank_empty;
25 int diff_use_color_default = -1;
26 static const char *external_diff_cmd_cfg;
27 int diff_auto_refresh_index = 1;
28 static int diff_mnemonic_prefix;
30 static char diff_colors[][COLOR_MAXLEN] = {
31 "\033[m", /* reset */
32 "", /* PLAIN (normal) */
33 "\033[1m", /* METAINFO (bold) */
34 "\033[36m", /* FRAGINFO (cyan) */
35 "\033[31m", /* OLD (red) */
36 "\033[32m", /* NEW (green) */
37 "\033[33m", /* COMMIT (yellow) */
38 "\033[41m", /* WHITESPACE (red background) */
39 };
41 static void diff_filespec_load_driver(struct diff_filespec *one);
42 static char *run_textconv(const char *, struct diff_filespec *, size_t *);
44 static int parse_diff_color_slot(const char *var, int ofs)
45 {
46 if (!strcasecmp(var+ofs, "plain"))
47 return DIFF_PLAIN;
48 if (!strcasecmp(var+ofs, "meta"))
49 return DIFF_METAINFO;
50 if (!strcasecmp(var+ofs, "frag"))
51 return DIFF_FRAGINFO;
52 if (!strcasecmp(var+ofs, "old"))
53 return DIFF_FILE_OLD;
54 if (!strcasecmp(var+ofs, "new"))
55 return DIFF_FILE_NEW;
56 if (!strcasecmp(var+ofs, "commit"))
57 return DIFF_COMMIT;
58 if (!strcasecmp(var+ofs, "whitespace"))
59 return DIFF_WHITESPACE;
60 die("bad config variable '%s'", var);
61 }
63 /*
64 * These are to give UI layer defaults.
65 * The core-level commands such as git-diff-files should
66 * never be affected by the setting of diff.renames
67 * the user happens to have in the configuration file.
68 */
69 int git_diff_ui_config(const char *var, const char *value, void *cb)
70 {
71 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
72 diff_use_color_default = git_config_colorbool(var, value, -1);
73 return 0;
74 }
75 if (!strcmp(var, "diff.renames")) {
76 if (!value)
77 diff_detect_rename_default = DIFF_DETECT_RENAME;
78 else if (!strcasecmp(value, "copies") ||
79 !strcasecmp(value, "copy"))
80 diff_detect_rename_default = DIFF_DETECT_COPY;
81 else if (git_config_bool(var,value))
82 diff_detect_rename_default = DIFF_DETECT_RENAME;
83 return 0;
84 }
85 if (!strcmp(var, "diff.autorefreshindex")) {
86 diff_auto_refresh_index = git_config_bool(var, value);
87 return 0;
88 }
89 if (!strcmp(var, "diff.mnemonicprefix")) {
90 diff_mnemonic_prefix = git_config_bool(var, value);
91 return 0;
92 }
93 if (!strcmp(var, "diff.external"))
94 return git_config_string(&external_diff_cmd_cfg, var, value);
96 return git_diff_basic_config(var, value, cb);
97 }
99 int git_diff_basic_config(const char *var, const char *value, void *cb)
100 {
101 if (!strcmp(var, "diff.renamelimit")) {
102 diff_rename_limit_default = git_config_int(var, value);
103 return 0;
104 }
106 switch (userdiff_config(var, value)) {
107 case 0: break;
108 case -1: return -1;
109 default: return 0;
110 }
112 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
113 int slot = parse_diff_color_slot(var, 11);
114 if (!value)
115 return config_error_nonbool(var);
116 color_parse(value, var, diff_colors[slot]);
117 return 0;
118 }
120 /* like GNU diff's --suppress-blank-empty option */
121 if (!strcmp(var, "diff.suppress-blank-empty")) {
122 diff_suppress_blank_empty = git_config_bool(var, value);
123 return 0;
124 }
126 return git_color_default_config(var, value, cb);
127 }
129 static char *quote_two(const char *one, const char *two)
130 {
131 int need_one = quote_c_style(one, NULL, NULL, 1);
132 int need_two = quote_c_style(two, NULL, NULL, 1);
133 struct strbuf res = STRBUF_INIT;
135 if (need_one + need_two) {
136 strbuf_addch(&res, '"');
137 quote_c_style(one, &res, NULL, 1);
138 quote_c_style(two, &res, NULL, 1);
139 strbuf_addch(&res, '"');
140 } else {
141 strbuf_addstr(&res, one);
142 strbuf_addstr(&res, two);
143 }
144 return strbuf_detach(&res, NULL);
145 }
147 static const char *external_diff(void)
148 {
149 static const char *external_diff_cmd = NULL;
150 static int done_preparing = 0;
152 if (done_preparing)
153 return external_diff_cmd;
154 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
155 if (!external_diff_cmd)
156 external_diff_cmd = external_diff_cmd_cfg;
157 done_preparing = 1;
158 return external_diff_cmd;
159 }
161 static struct diff_tempfile {
162 const char *name; /* filename external diff should read from */
163 char hex[41];
164 char mode[10];
165 char tmp_path[PATH_MAX];
166 } diff_temp[2];
168 static int count_lines(const char *data, int size)
169 {
170 int count, ch, completely_empty = 1, nl_just_seen = 0;
171 count = 0;
172 while (0 < size--) {
173 ch = *data++;
174 if (ch == '\n') {
175 count++;
176 nl_just_seen = 1;
177 completely_empty = 0;
178 }
179 else {
180 nl_just_seen = 0;
181 completely_empty = 0;
182 }
183 }
184 if (completely_empty)
185 return 0;
186 if (!nl_just_seen)
187 count++; /* no trailing newline */
188 return count;
189 }
191 static void print_line_count(FILE *file, int count)
192 {
193 switch (count) {
194 case 0:
195 fprintf(file, "0,0");
196 break;
197 case 1:
198 fprintf(file, "1");
199 break;
200 default:
201 fprintf(file, "1,%d", count);
202 break;
203 }
204 }
206 static void copy_file_with_prefix(FILE *file,
207 int prefix, const char *data, int size,
208 const char *set, const char *reset)
209 {
210 int ch, nl_just_seen = 1;
211 while (0 < size--) {
212 ch = *data++;
213 if (nl_just_seen) {
214 fputs(set, file);
215 putc(prefix, file);
216 }
217 if (ch == '\n') {
218 nl_just_seen = 1;
219 fputs(reset, file);
220 } else
221 nl_just_seen = 0;
222 putc(ch, file);
223 }
224 if (!nl_just_seen)
225 fprintf(file, "%s\n\\ No newline at end of file\n", reset);
226 }
228 static void emit_rewrite_diff(const char *name_a,
229 const char *name_b,
230 struct diff_filespec *one,
231 struct diff_filespec *two,
232 struct diff_options *o)
233 {
234 int lc_a, lc_b;
235 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
236 const char *name_a_tab, *name_b_tab;
237 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
238 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
239 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
240 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
241 const char *reset = diff_get_color(color_diff, DIFF_RESET);
242 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
243 const char *a_prefix, *b_prefix;
245 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
246 a_prefix = o->b_prefix;
247 b_prefix = o->a_prefix;
248 } else {
249 a_prefix = o->a_prefix;
250 b_prefix = o->b_prefix;
251 }
253 name_a += (*name_a == '/');
254 name_b += (*name_b == '/');
255 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
256 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
258 strbuf_reset(&a_name);
259 strbuf_reset(&b_name);
260 quote_two_c_style(&a_name, a_prefix, name_a, 0);
261 quote_two_c_style(&b_name, b_prefix, name_b, 0);
263 diff_populate_filespec(one, 0);
264 diff_populate_filespec(two, 0);
265 lc_a = count_lines(one->data, one->size);
266 lc_b = count_lines(two->data, two->size);
267 fprintf(o->file,
268 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
269 metainfo, a_name.buf, name_a_tab, reset,
270 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
271 print_line_count(o->file, lc_a);
272 fprintf(o->file, " +");
273 print_line_count(o->file, lc_b);
274 fprintf(o->file, " @@%s\n", reset);
275 if (lc_a)
276 copy_file_with_prefix(o->file, '-', one->data, one->size, old, reset);
277 if (lc_b)
278 copy_file_with_prefix(o->file, '+', two->data, two->size, new, reset);
279 }
281 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
282 {
283 if (!DIFF_FILE_VALID(one)) {
284 mf->ptr = (char *)""; /* does not matter */
285 mf->size = 0;
286 return 0;
287 }
288 else if (diff_populate_filespec(one, 0))
289 return -1;
291 mf->ptr = one->data;
292 mf->size = one->size;
293 return 0;
294 }
296 struct diff_words_buffer {
297 mmfile_t text;
298 long alloc;
299 long current; /* output pointer */
300 int suppressed_newline;
301 };
303 static void diff_words_append(char *line, unsigned long len,
304 struct diff_words_buffer *buffer)
305 {
306 if (buffer->text.size + len > buffer->alloc) {
307 buffer->alloc = (buffer->text.size + len) * 3 / 2;
308 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
309 }
310 line++;
311 len--;
312 memcpy(buffer->text.ptr + buffer->text.size, line, len);
313 buffer->text.size += len;
314 }
316 struct diff_words_data {
317 struct diff_words_buffer minus, plus;
318 FILE *file;
319 };
321 static void print_word(FILE *file, struct diff_words_buffer *buffer, int len, int color,
322 int suppress_newline)
323 {
324 const char *ptr;
325 int eol = 0;
327 if (len == 0)
328 return;
330 ptr = buffer->text.ptr + buffer->current;
331 buffer->current += len;
333 if (ptr[len - 1] == '\n') {
334 eol = 1;
335 len--;
336 }
338 fputs(diff_get_color(1, color), file);
339 fwrite(ptr, len, 1, file);
340 fputs(diff_get_color(1, DIFF_RESET), file);
342 if (eol) {
343 if (suppress_newline)
344 buffer->suppressed_newline = 1;
345 else
346 putc('\n', file);
347 }
348 }
350 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
351 {
352 struct diff_words_data *diff_words = priv;
354 if (diff_words->minus.suppressed_newline) {
355 if (line[0] != '+')
356 putc('\n', diff_words->file);
357 diff_words->minus.suppressed_newline = 0;
358 }
360 len--;
361 switch (line[0]) {
362 case '-':
363 print_word(diff_words->file,
364 &diff_words->minus, len, DIFF_FILE_OLD, 1);
365 break;
366 case '+':
367 print_word(diff_words->file,
368 &diff_words->plus, len, DIFF_FILE_NEW, 0);
369 break;
370 case ' ':
371 print_word(diff_words->file,
372 &diff_words->plus, len, DIFF_PLAIN, 0);
373 diff_words->minus.current += len;
374 break;
375 }
376 }
378 /* this executes the word diff on the accumulated buffers */
379 static void diff_words_show(struct diff_words_data *diff_words)
380 {
381 xpparam_t xpp;
382 xdemitconf_t xecfg;
383 xdemitcb_t ecb;
384 mmfile_t minus, plus;
385 int i;
387 memset(&xpp, 0, sizeof(xpp));
388 memset(&xecfg, 0, sizeof(xecfg));
389 minus.size = diff_words->minus.text.size;
390 minus.ptr = xmalloc(minus.size);
391 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
392 for (i = 0; i < minus.size; i++)
393 if (isspace(minus.ptr[i]))
394 minus.ptr[i] = '\n';
395 diff_words->minus.current = 0;
397 plus.size = diff_words->plus.text.size;
398 plus.ptr = xmalloc(plus.size);
399 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
400 for (i = 0; i < plus.size; i++)
401 if (isspace(plus.ptr[i]))
402 plus.ptr[i] = '\n';
403 diff_words->plus.current = 0;
405 xpp.flags = XDF_NEED_MINIMAL;
406 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
407 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
408 &xpp, &xecfg, &ecb);
409 free(minus.ptr);
410 free(plus.ptr);
411 diff_words->minus.text.size = diff_words->plus.text.size = 0;
413 if (diff_words->minus.suppressed_newline) {
414 putc('\n', diff_words->file);
415 diff_words->minus.suppressed_newline = 0;
416 }
417 }
419 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
421 struct emit_callback {
422 int nparents, color_diff;
423 unsigned ws_rule;
424 sane_truncate_fn truncate;
425 const char **label_path;
426 struct diff_words_data *diff_words;
427 int *found_changesp;
428 FILE *file;
429 };
431 static void free_diff_words_data(struct emit_callback *ecbdata)
432 {
433 if (ecbdata->diff_words) {
434 /* flush buffers */
435 if (ecbdata->diff_words->minus.text.size ||
436 ecbdata->diff_words->plus.text.size)
437 diff_words_show(ecbdata->diff_words);
439 free (ecbdata->diff_words->minus.text.ptr);
440 free (ecbdata->diff_words->plus.text.ptr);
441 free(ecbdata->diff_words);
442 ecbdata->diff_words = NULL;
443 }
444 }
446 const char *diff_get_color(int diff_use_color, enum color_diff ix)
447 {
448 if (diff_use_color)
449 return diff_colors[ix];
450 return "";
451 }
453 static void emit_line(FILE *file, const char *set, const char *reset, const char *line, int len)
454 {
455 int has_trailing_newline, has_trailing_carriage_return;
457 has_trailing_newline = (len > 0 && line[len-1] == '\n');
458 if (has_trailing_newline)
459 len--;
460 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
461 if (has_trailing_carriage_return)
462 len--;
464 fputs(set, file);
465 fwrite(line, len, 1, file);
466 fputs(reset, file);
467 if (has_trailing_carriage_return)
468 fputc('\r', file);
469 if (has_trailing_newline)
470 fputc('\n', file);
471 }
473 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
474 {
475 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
476 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
478 if (!*ws)
479 emit_line(ecbdata->file, set, reset, line, len);
480 else {
481 /* Emit just the prefix, then the rest. */
482 emit_line(ecbdata->file, set, reset, line, ecbdata->nparents);
483 ws_check_emit(line + ecbdata->nparents,
484 len - ecbdata->nparents, ecbdata->ws_rule,
485 ecbdata->file, set, reset, ws);
486 }
487 }
489 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
490 {
491 const char *cp;
492 unsigned long allot;
493 size_t l = len;
495 if (ecb->truncate)
496 return ecb->truncate(line, len);
497 cp = line;
498 allot = l;
499 while (0 < l) {
500 (void) utf8_width(&cp, &l);
501 if (!cp)
502 break; /* truncated in the middle? */
503 }
504 return allot - l;
505 }
507 static void fn_out_consume(void *priv, char *line, unsigned long len)
508 {
509 int i;
510 int color;
511 struct emit_callback *ecbdata = priv;
512 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
513 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
514 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
516 *(ecbdata->found_changesp) = 1;
518 if (ecbdata->label_path[0]) {
519 const char *name_a_tab, *name_b_tab;
521 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
522 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
524 fprintf(ecbdata->file, "%s--- %s%s%s\n",
525 meta, ecbdata->label_path[0], reset, name_a_tab);
526 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
527 meta, ecbdata->label_path[1], reset, name_b_tab);
528 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
529 }
531 if (diff_suppress_blank_empty
532 && len == 2 && line[0] == ' ' && line[1] == '\n') {
533 line[0] = '\n';
534 len = 1;
535 }
537 /* This is not really necessary for now because
538 * this codepath only deals with two-way diffs.
539 */
540 for (i = 0; i < len && line[i] == '@'; i++)
541 ;
542 if (2 <= i && i < len && line[i] == ' ') {
543 ecbdata->nparents = i - 1;
544 len = sane_truncate_line(ecbdata, line, len);
545 emit_line(ecbdata->file,
546 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
547 reset, line, len);
548 if (line[len-1] != '\n')
549 putc('\n', ecbdata->file);
550 return;
551 }
553 if (len < ecbdata->nparents) {
554 emit_line(ecbdata->file, reset, reset, line, len);
555 return;
556 }
558 color = DIFF_PLAIN;
559 if (ecbdata->diff_words && ecbdata->nparents != 1)
560 /* fall back to normal diff */
561 free_diff_words_data(ecbdata);
562 if (ecbdata->diff_words) {
563 if (line[0] == '-') {
564 diff_words_append(line, len,
565 &ecbdata->diff_words->minus);
566 return;
567 } else if (line[0] == '+') {
568 diff_words_append(line, len,
569 &ecbdata->diff_words->plus);
570 return;
571 }
572 if (ecbdata->diff_words->minus.text.size ||
573 ecbdata->diff_words->plus.text.size)
574 diff_words_show(ecbdata->diff_words);
575 line++;
576 len--;
577 emit_line(ecbdata->file, plain, reset, line, len);
578 return;
579 }
580 for (i = 0; i < ecbdata->nparents && len; i++) {
581 if (line[i] == '-')
582 color = DIFF_FILE_OLD;
583 else if (line[i] == '+')
584 color = DIFF_FILE_NEW;
585 }
587 if (color != DIFF_FILE_NEW) {
588 emit_line(ecbdata->file,
589 diff_get_color(ecbdata->color_diff, color),
590 reset, line, len);
591 return;
592 }
593 emit_add_line(reset, ecbdata, line, len);
594 }
596 static char *pprint_rename(const char *a, const char *b)
597 {
598 const char *old = a;
599 const char *new = b;
600 struct strbuf name = STRBUF_INIT;
601 int pfx_length, sfx_length;
602 int len_a = strlen(a);
603 int len_b = strlen(b);
604 int a_midlen, b_midlen;
605 int qlen_a = quote_c_style(a, NULL, NULL, 0);
606 int qlen_b = quote_c_style(b, NULL, NULL, 0);
608 if (qlen_a || qlen_b) {
609 quote_c_style(a, &name, NULL, 0);
610 strbuf_addstr(&name, " => ");
611 quote_c_style(b, &name, NULL, 0);
612 return strbuf_detach(&name, NULL);
613 }
615 /* Find common prefix */
616 pfx_length = 0;
617 while (*old && *new && *old == *new) {
618 if (*old == '/')
619 pfx_length = old - a + 1;
620 old++;
621 new++;
622 }
624 /* Find common suffix */
625 old = a + len_a;
626 new = b + len_b;
627 sfx_length = 0;
628 while (a <= old && b <= new && *old == *new) {
629 if (*old == '/')
630 sfx_length = len_a - (old - a);
631 old--;
632 new--;
633 }
635 /*
636 * pfx{mid-a => mid-b}sfx
637 * {pfx-a => pfx-b}sfx
638 * pfx{sfx-a => sfx-b}
639 * name-a => name-b
640 */
641 a_midlen = len_a - pfx_length - sfx_length;
642 b_midlen = len_b - pfx_length - sfx_length;
643 if (a_midlen < 0)
644 a_midlen = 0;
645 if (b_midlen < 0)
646 b_midlen = 0;
648 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
649 if (pfx_length + sfx_length) {
650 strbuf_add(&name, a, pfx_length);
651 strbuf_addch(&name, '{');
652 }
653 strbuf_add(&name, a + pfx_length, a_midlen);
654 strbuf_addstr(&name, " => ");
655 strbuf_add(&name, b + pfx_length, b_midlen);
656 if (pfx_length + sfx_length) {
657 strbuf_addch(&name, '}');
658 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
659 }
660 return strbuf_detach(&name, NULL);
661 }
663 struct diffstat_t {
664 int nr;
665 int alloc;
666 struct diffstat_file {
667 char *from_name;
668 char *name;
669 char *print_name;
670 unsigned is_unmerged:1;
671 unsigned is_binary:1;
672 unsigned is_renamed:1;
673 unsigned int added, deleted;
674 } **files;
675 };
677 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
678 const char *name_a,
679 const char *name_b)
680 {
681 struct diffstat_file *x;
682 x = xcalloc(sizeof (*x), 1);
683 if (diffstat->nr == diffstat->alloc) {
684 diffstat->alloc = alloc_nr(diffstat->alloc);
685 diffstat->files = xrealloc(diffstat->files,
686 diffstat->alloc * sizeof(x));
687 }
688 diffstat->files[diffstat->nr++] = x;
689 if (name_b) {
690 x->from_name = xstrdup(name_a);
691 x->name = xstrdup(name_b);
692 x->is_renamed = 1;
693 }
694 else {
695 x->from_name = NULL;
696 x->name = xstrdup(name_a);
697 }
698 return x;
699 }
701 static void diffstat_consume(void *priv, char *line, unsigned long len)
702 {
703 struct diffstat_t *diffstat = priv;
704 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
706 if (line[0] == '+')
707 x->added++;
708 else if (line[0] == '-')
709 x->deleted++;
710 }
712 const char mime_boundary_leader[] = "------------";
714 static int scale_linear(int it, int width, int max_change)
715 {
716 /*
717 * make sure that at least one '-' is printed if there were deletions,
718 * and likewise for '+'.
719 */
720 if (max_change < 2)
721 return it;
722 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
723 }
725 static void show_name(FILE *file,
726 const char *prefix, const char *name, int len,
727 const char *reset, const char *set)
728 {
729 fprintf(file, " %s%s%-*s%s |", set, prefix, len, name, reset);
730 }
732 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
733 {
734 if (cnt <= 0)
735 return;
736 fprintf(file, "%s", set);
737 while (cnt--)
738 putc(ch, file);
739 fprintf(file, "%s", reset);
740 }
742 static void fill_print_name(struct diffstat_file *file)
743 {
744 char *pname;
746 if (file->print_name)
747 return;
749 if (!file->is_renamed) {
750 struct strbuf buf = STRBUF_INIT;
751 if (quote_c_style(file->name, &buf, NULL, 0)) {
752 pname = strbuf_detach(&buf, NULL);
753 } else {
754 pname = file->name;
755 strbuf_release(&buf);
756 }
757 } else {
758 pname = pprint_rename(file->from_name, file->name);
759 }
760 file->print_name = pname;
761 }
763 static void show_stats(struct diffstat_t* data, struct diff_options *options)
764 {
765 int i, len, add, del, total, adds = 0, dels = 0;
766 int max_change = 0, max_len = 0;
767 int total_files = data->nr;
768 int width, name_width;
769 const char *reset, *set, *add_c, *del_c;
771 if (data->nr == 0)
772 return;
774 width = options->stat_width ? options->stat_width : 80;
775 name_width = options->stat_name_width ? options->stat_name_width : 50;
777 /* Sanity: give at least 5 columns to the graph,
778 * but leave at least 10 columns for the name.
779 */
780 if (width < 25)
781 width = 25;
782 if (name_width < 10)
783 name_width = 10;
784 else if (width < name_width + 15)
785 name_width = width - 15;
787 /* Find the longest filename and max number of changes */
788 reset = diff_get_color_opt(options, DIFF_RESET);
789 set = diff_get_color_opt(options, DIFF_PLAIN);
790 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
791 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
793 for (i = 0; i < data->nr; i++) {
794 struct diffstat_file *file = data->files[i];
795 int change = file->added + file->deleted;
796 fill_print_name(file);
797 len = strlen(file->print_name);
798 if (max_len < len)
799 max_len = len;
801 if (file->is_binary || file->is_unmerged)
802 continue;
803 if (max_change < change)
804 max_change = change;
805 }
807 /* Compute the width of the graph part;
808 * 10 is for one blank at the beginning of the line plus
809 * " | count " between the name and the graph.
810 *
811 * From here on, name_width is the width of the name area,
812 * and width is the width of the graph area.
813 */
814 name_width = (name_width < max_len) ? name_width : max_len;
815 if (width < (name_width + 10) + max_change)
816 width = width - (name_width + 10);
817 else
818 width = max_change;
820 for (i = 0; i < data->nr; i++) {
821 const char *prefix = "";
822 char *name = data->files[i]->print_name;
823 int added = data->files[i]->added;
824 int deleted = data->files[i]->deleted;
825 int name_len;
827 /*
828 * "scale" the filename
829 */
830 len = name_width;
831 name_len = strlen(name);
832 if (name_width < name_len) {
833 char *slash;
834 prefix = "...";
835 len -= 3;
836 name += name_len - len;
837 slash = strchr(name, '/');
838 if (slash)
839 name = slash;
840 }
842 if (data->files[i]->is_binary) {
843 show_name(options->file, prefix, name, len, reset, set);
844 fprintf(options->file, " Bin ");
845 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
846 fprintf(options->file, " -> ");
847 fprintf(options->file, "%s%d%s", add_c, added, reset);
848 fprintf(options->file, " bytes");
849 fprintf(options->file, "\n");
850 continue;
851 }
852 else if (data->files[i]->is_unmerged) {
853 show_name(options->file, prefix, name, len, reset, set);
854 fprintf(options->file, " Unmerged\n");
855 continue;
856 }
857 else if (!data->files[i]->is_renamed &&
858 (added + deleted == 0)) {
859 total_files--;
860 continue;
861 }
863 /*
864 * scale the add/delete
865 */
866 add = added;
867 del = deleted;
868 total = add + del;
869 adds += add;
870 dels += del;
872 if (width <= max_change) {
873 add = scale_linear(add, width, max_change);
874 del = scale_linear(del, width, max_change);
875 total = add + del;
876 }
877 show_name(options->file, prefix, name, len, reset, set);
878 fprintf(options->file, "%5d%s", added + deleted,
879 added + deleted ? " " : "");
880 show_graph(options->file, '+', add, add_c, reset);
881 show_graph(options->file, '-', del, del_c, reset);
882 fprintf(options->file, "\n");
883 }
884 fprintf(options->file,
885 "%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
886 set, total_files, adds, dels, reset);
887 }
889 static void show_shortstats(struct diffstat_t* data, struct diff_options *options)
890 {
891 int i, adds = 0, dels = 0, total_files = data->nr;
893 if (data->nr == 0)
894 return;
896 for (i = 0; i < data->nr; i++) {
897 if (!data->files[i]->is_binary &&
898 !data->files[i]->is_unmerged) {
899 int added = data->files[i]->added;
900 int deleted= data->files[i]->deleted;
901 if (!data->files[i]->is_renamed &&
902 (added + deleted == 0)) {
903 total_files--;
904 } else {
905 adds += added;
906 dels += deleted;
907 }
908 }
909 }
910 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
911 total_files, adds, dels);
912 }
914 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
915 {
916 int i;
918 if (data->nr == 0)
919 return;
921 for (i = 0; i < data->nr; i++) {
922 struct diffstat_file *file = data->files[i];
924 if (file->is_binary)
925 fprintf(options->file, "-\t-\t");
926 else
927 fprintf(options->file,
928 "%d\t%d\t", file->added, file->deleted);
929 if (options->line_termination) {
930 fill_print_name(file);
931 if (!file->is_renamed)
932 write_name_quoted(file->name, options->file,
933 options->line_termination);
934 else {
935 fputs(file->print_name, options->file);
936 putc(options->line_termination, options->file);
937 }
938 } else {
939 if (file->is_renamed) {
940 putc('\0', options->file);
941 write_name_quoted(file->from_name, options->file, '\0');
942 }
943 write_name_quoted(file->name, options->file, '\0');
944 }
945 }
946 }
948 struct dirstat_file {
949 const char *name;
950 unsigned long changed;
951 };
953 struct dirstat_dir {
954 struct dirstat_file *files;
955 int alloc, nr, percent, cumulative;
956 };
958 static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
959 {
960 unsigned long this_dir = 0;
961 unsigned int sources = 0;
963 while (dir->nr) {
964 struct dirstat_file *f = dir->files;
965 int namelen = strlen(f->name);
966 unsigned long this;
967 char *slash;
969 if (namelen < baselen)
970 break;
971 if (memcmp(f->name, base, baselen))
972 break;
973 slash = strchr(f->name + baselen, '/');
974 if (slash) {
975 int newbaselen = slash + 1 - f->name;
976 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
977 sources++;
978 } else {
979 this = f->changed;
980 dir->files++;
981 dir->nr--;
982 sources += 2;
983 }
984 this_dir += this;
985 }
987 /*
988 * We don't report dirstat's for
989 * - the top level
990 * - or cases where everything came from a single directory
991 * under this directory (sources == 1).
992 */
993 if (baselen && sources != 1) {
994 int permille = this_dir * 1000 / changed;
995 if (permille) {
996 int percent = permille / 10;
997 if (percent >= dir->percent) {
998 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
999 if (!dir->cumulative)
1000 return 0;
1001 }
1002 }
1003 }
1004 return this_dir;
1005 }
1007 static int dirstat_compare(const void *_a, const void *_b)
1008 {
1009 const struct dirstat_file *a = _a;
1010 const struct dirstat_file *b = _b;
1011 return strcmp(a->name, b->name);
1012 }
1014 static void show_dirstat(struct diff_options *options)
1015 {
1016 int i;
1017 unsigned long changed;
1018 struct dirstat_dir dir;
1019 struct diff_queue_struct *q = &diff_queued_diff;
1021 dir.files = NULL;
1022 dir.alloc = 0;
1023 dir.nr = 0;
1024 dir.percent = options->dirstat_percent;
1025 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1027 changed = 0;
1028 for (i = 0; i < q->nr; i++) {
1029 struct diff_filepair *p = q->queue[i];
1030 const char *name;
1031 unsigned long copied, added, damage;
1033 name = p->one->path ? p->one->path : p->two->path;
1035 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1036 diff_populate_filespec(p->one, 0);
1037 diff_populate_filespec(p->two, 0);
1038 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1039 &copied, &added);
1040 diff_free_filespec_data(p->one);
1041 diff_free_filespec_data(p->two);
1042 } else if (DIFF_FILE_VALID(p->one)) {
1043 diff_populate_filespec(p->one, 1);
1044 copied = added = 0;
1045 diff_free_filespec_data(p->one);
1046 } else if (DIFF_FILE_VALID(p->two)) {
1047 diff_populate_filespec(p->two, 1);
1048 copied = 0;
1049 added = p->two->size;
1050 diff_free_filespec_data(p->two);
1051 } else
1052 continue;
1054 /*
1055 * Original minus copied is the removed material,
1056 * added is the new material. They are both damages
1057 * made to the preimage. In --dirstat-by-file mode, count
1058 * damaged files, not damaged lines. This is done by
1059 * counting only a single damaged line per file.
1060 */
1061 damage = (p->one->size - copied) + added;
1062 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1063 damage = 1;
1065 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1066 dir.files[dir.nr].name = name;
1067 dir.files[dir.nr].changed = damage;
1068 changed += damage;
1069 dir.nr++;
1070 }
1072 /* This can happen even with many files, if everything was renames */
1073 if (!changed)
1074 return;
1076 /* Show all directories with more than x% of the changes */
1077 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1078 gather_dirstat(options->file, &dir, changed, "", 0);
1079 }
1081 static void free_diffstat_info(struct diffstat_t *diffstat)
1082 {
1083 int i;
1084 for (i = 0; i < diffstat->nr; i++) {
1085 struct diffstat_file *f = diffstat->files[i];
1086 if (f->name != f->print_name)
1087 free(f->print_name);
1088 free(f->name);
1089 free(f->from_name);
1090 free(f);
1091 }
1092 free(diffstat->files);
1093 }
1095 struct checkdiff_t {
1096 const char *filename;
1097 int lineno;
1098 struct diff_options *o;
1099 unsigned ws_rule;
1100 unsigned status;
1101 int trailing_blanks_start;
1102 };
1104 static int is_conflict_marker(const char *line, unsigned long len)
1105 {
1106 char firstchar;
1107 int cnt;
1109 if (len < 8)
1110 return 0;
1111 firstchar = line[0];
1112 switch (firstchar) {
1113 case '=': case '>': case '<':
1114 break;
1115 default:
1116 return 0;
1117 }
1118 for (cnt = 1; cnt < 7; cnt++)
1119 if (line[cnt] != firstchar)
1120 return 0;
1121 /* line[0] thru line[6] are same as firstchar */
1122 if (firstchar == '=') {
1123 /* divider between ours and theirs? */
1124 if (len != 8 || line[7] != '\n')
1125 return 0;
1126 } else if (len < 8 || !isspace(line[7])) {
1127 /* not divider before ours nor after theirs */
1128 return 0;
1129 }
1130 return 1;
1131 }
1133 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1134 {
1135 struct checkdiff_t *data = priv;
1136 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1137 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1138 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1139 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1140 char *err;
1142 if (line[0] == '+') {
1143 unsigned bad;
1144 data->lineno++;
1145 if (!ws_blank_line(line + 1, len - 1, data->ws_rule))
1146 data->trailing_blanks_start = 0;
1147 else if (!data->trailing_blanks_start)
1148 data->trailing_blanks_start = data->lineno;
1149 if (is_conflict_marker(line + 1, len - 1)) {
1150 data->status |= 1;
1151 fprintf(data->o->file,
1152 "%s:%d: leftover conflict marker\n",
1153 data->filename, data->lineno);
1154 }
1155 bad = ws_check(line + 1, len - 1, data->ws_rule);
1156 if (!bad)
1157 return;
1158 data->status |= bad;
1159 err = whitespace_error_string(bad);
1160 fprintf(data->o->file, "%s:%d: %s.\n",
1161 data->filename, data->lineno, err);
1162 free(err);
1163 emit_line(data->o->file, set, reset, line, 1);
1164 ws_check_emit(line + 1, len - 1, data->ws_rule,
1165 data->o->file, set, reset, ws);
1166 } else if (line[0] == ' ') {
1167 data->lineno++;
1168 data->trailing_blanks_start = 0;
1169 } else if (line[0] == '@') {
1170 char *plus = strchr(line, '+');
1171 if (plus)
1172 data->lineno = strtol(plus, NULL, 10) - 1;
1173 else
1174 die("invalid diff");
1175 data->trailing_blanks_start = 0;
1176 }
1177 }
1179 static unsigned char *deflate_it(char *data,
1180 unsigned long size,
1181 unsigned long *result_size)
1182 {
1183 int bound;
1184 unsigned char *deflated;
1185 z_stream stream;
1187 memset(&stream, 0, sizeof(stream));
1188 deflateInit(&stream, zlib_compression_level);
1189 bound = deflateBound(&stream, size);
1190 deflated = xmalloc(bound);
1191 stream.next_out = deflated;
1192 stream.avail_out = bound;
1194 stream.next_in = (unsigned char *)data;
1195 stream.avail_in = size;
1196 while (deflate(&stream, Z_FINISH) == Z_OK)
1197 ; /* nothing */
1198 deflateEnd(&stream);
1199 *result_size = stream.total_out;
1200 return deflated;
1201 }
1203 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
1204 {
1205 void *cp;
1206 void *delta;
1207 void *deflated;
1208 void *data;
1209 unsigned long orig_size;
1210 unsigned long delta_size;
1211 unsigned long deflate_size;
1212 unsigned long data_size;
1214 /* We could do deflated delta, or we could do just deflated two,
1215 * whichever is smaller.
1216 */
1217 delta = NULL;
1218 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1219 if (one->size && two->size) {
1220 delta = diff_delta(one->ptr, one->size,
1221 two->ptr, two->size,
1222 &delta_size, deflate_size);
1223 if (delta) {
1224 void *to_free = delta;
1225 orig_size = delta_size;
1226 delta = deflate_it(delta, delta_size, &delta_size);
1227 free(to_free);
1228 }
1229 }
1231 if (delta && delta_size < deflate_size) {
1232 fprintf(file, "delta %lu\n", orig_size);
1233 free(deflated);
1234 data = delta;
1235 data_size = delta_size;
1236 }
1237 else {
1238 fprintf(file, "literal %lu\n", two->size);
1239 free(delta);
1240 data = deflated;
1241 data_size = deflate_size;
1242 }
1244 /* emit data encoded in base85 */
1245 cp = data;
1246 while (data_size) {
1247 int bytes = (52 < data_size) ? 52 : data_size;
1248 char line[70];
1249 data_size -= bytes;
1250 if (bytes <= 26)
1251 line[0] = bytes + 'A' - 1;
1252 else
1253 line[0] = bytes - 26 + 'a' - 1;
1254 encode_85(line + 1, cp, bytes);
1255 cp = (char *) cp + bytes;
1256 fputs(line, file);
1257 fputc('\n', file);
1258 }
1259 fprintf(file, "\n");
1260 free(data);
1261 }
1263 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
1264 {
1265 fprintf(file, "GIT binary patch\n");
1266 emit_binary_diff_body(file, one, two);
1267 emit_binary_diff_body(file, two, one);
1268 }
1270 static void diff_filespec_load_driver(struct diff_filespec *one)
1271 {
1272 if (!one->driver)
1273 one->driver = userdiff_find_by_path(one->path);
1274 if (!one->driver)
1275 one->driver = userdiff_find_by_name("default");
1276 }
1278 int diff_filespec_is_binary(struct diff_filespec *one)
1279 {
1280 if (one->is_binary == -1) {
1281 diff_filespec_load_driver(one);
1282 if (one->driver->binary != -1)
1283 one->is_binary = one->driver->binary;
1284 else {
1285 if (!one->data && DIFF_FILE_VALID(one))
1286 diff_populate_filespec(one, 0);
1287 if (one->data)
1288 one->is_binary = buffer_is_binary(one->data,
1289 one->size);
1290 if (one->is_binary == -1)
1291 one->is_binary = 0;
1292 }
1293 }
1294 return one->is_binary;
1295 }
1297 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1298 {
1299 diff_filespec_load_driver(one);
1300 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1301 }
1303 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1304 {
1305 if (!options->a_prefix)
1306 options->a_prefix = a;
1307 if (!options->b_prefix)
1308 options->b_prefix = b;
1309 }
1311 static const char *get_textconv(struct diff_filespec *one)
1312 {
1313 if (!DIFF_FILE_VALID(one))
1314 return NULL;
1315 if (!S_ISREG(one->mode))
1316 return NULL;
1317 diff_filespec_load_driver(one);
1318 return one->driver->textconv;
1319 }
1321 static void builtin_diff(const char *name_a,
1322 const char *name_b,
1323 struct diff_filespec *one,
1324 struct diff_filespec *two,
1325 const char *xfrm_msg,
1326 struct diff_options *o,
1327 int complete_rewrite)
1328 {
1329 mmfile_t mf1, mf2;
1330 const char *lbl[2];
1331 char *a_one, *b_two;
1332 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1333 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1334 const char *a_prefix, *b_prefix;
1335 const char *textconv_one = NULL, *textconv_two = NULL;
1337 diff_set_mnemonic_prefix(o, "a/", "b/");
1338 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1339 a_prefix = o->b_prefix;
1340 b_prefix = o->a_prefix;
1341 } else {
1342 a_prefix = o->a_prefix;
1343 b_prefix = o->b_prefix;
1344 }
1346 /* Never use a non-valid filename anywhere if at all possible */
1347 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1348 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1350 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1351 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1352 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1353 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1354 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1355 if (lbl[0][0] == '/') {
1356 /* /dev/null */
1357 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
1358 if (xfrm_msg && xfrm_msg[0])
1359 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1360 }
1361 else if (lbl[1][0] == '/') {
1362 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1363 if (xfrm_msg && xfrm_msg[0])
1364 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1365 }
1366 else {
1367 if (one->mode != two->mode) {
1368 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1369 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
1370 }
1371 if (xfrm_msg && xfrm_msg[0])
1372 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1373 /*
1374 * we do not run diff between different kind
1375 * of objects.
1376 */
1377 if ((one->mode ^ two->mode) & S_IFMT)
1378 goto free_ab_and_return;
1379 if (complete_rewrite &&
1380 !diff_filespec_is_binary(one) &&
1381 !diff_filespec_is_binary(two)) {
1382 emit_rewrite_diff(name_a, name_b, one, two, o);
1383 o->found_changes = 1;
1384 goto free_ab_and_return;
1385 }
1386 }
1388 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1389 die("unable to read files to diff");
1391 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1392 textconv_one = get_textconv(one);
1393 textconv_two = get_textconv(two);
1394 }
1396 if (!DIFF_OPT_TST(o, TEXT) &&
1397 ( (diff_filespec_is_binary(one) && !textconv_one) ||
1398 (diff_filespec_is_binary(two) && !textconv_two) )) {
1399 /* Quite common confusing case */
1400 if (mf1.size == mf2.size &&
1401 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1402 goto free_ab_and_return;
1403 if (DIFF_OPT_TST(o, BINARY))
1404 emit_binary_diff(o->file, &mf1, &mf2);
1405 else
1406 fprintf(o->file, "Binary files %s and %s differ\n",
1407 lbl[0], lbl[1]);
1408 o->found_changes = 1;
1409 }
1410 else {
1411 /* Crazy xdl interfaces.. */
1412 const char *diffopts = getenv("GIT_DIFF_OPTS");
1413 xpparam_t xpp;
1414 xdemitconf_t xecfg;
1415 xdemitcb_t ecb;
1416 struct emit_callback ecbdata;
1417 const struct userdiff_funcname *pe;
1419 if (textconv_one) {
1420 size_t size;
1421 mf1.ptr = run_textconv(textconv_one, one, &size);
1422 if (!mf1.ptr)
1423 die("unable to read files to diff");
1424 mf1.size = size;
1425 }
1426 if (textconv_two) {
1427 size_t size;
1428 mf2.ptr = run_textconv(textconv_two, two, &size);
1429 if (!mf2.ptr)
1430 die("unable to read files to diff");
1431 mf2.size = size;
1432 }
1434 pe = diff_funcname_pattern(one);
1435 if (!pe)
1436 pe = diff_funcname_pattern(two);
1438 memset(&xpp, 0, sizeof(xpp));
1439 memset(&xecfg, 0, sizeof(xecfg));
1440 memset(&ecbdata, 0, sizeof(ecbdata));
1441 ecbdata.label_path = lbl;
1442 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1443 ecbdata.found_changesp = &o->found_changes;
1444 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1445 ecbdata.file = o->file;
1446 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1447 xecfg.ctxlen = o->context;
1448 xecfg.flags = XDL_EMIT_FUNCNAMES;
1449 if (pe)
1450 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1451 if (!diffopts)
1452 ;
1453 else if (!prefixcmp(diffopts, "--unified="))
1454 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1455 else if (!prefixcmp(diffopts, "-u"))
1456 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1457 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1458 ecbdata.diff_words =
1459 xcalloc(1, sizeof(struct diff_words_data));
1460 ecbdata.diff_words->file = o->file;
1461 }
1462 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
1463 &xpp, &xecfg, &ecb);
1464 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1465 free_diff_words_data(&ecbdata);
1466 if (textconv_one)
1467 free(mf1.ptr);
1468 if (textconv_two)
1469 free(mf2.ptr);
1470 }
1472 free_ab_and_return:
1473 diff_free_filespec_data(one);
1474 diff_free_filespec_data(two);
1475 free(a_one);
1476 free(b_two);
1477 return;
1478 }
1480 static void builtin_diffstat(const char *name_a, const char *name_b,
1481 struct diff_filespec *one,
1482 struct diff_filespec *two,
1483 struct diffstat_t *diffstat,
1484 struct diff_options *o,
1485 int complete_rewrite)
1486 {
1487 mmfile_t mf1, mf2;
1488 struct diffstat_file *data;
1490 data = diffstat_add(diffstat, name_a, name_b);
1492 if (!one || !two) {
1493 data->is_unmerged = 1;
1494 return;
1495 }
1496 if (complete_rewrite) {
1497 diff_populate_filespec(one, 0);
1498 diff_populate_filespec(two, 0);
1499 data->deleted = count_lines(one->data, one->size);
1500 data->added = count_lines(two->data, two->size);
1501 goto free_and_return;
1502 }
1503 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1504 die("unable to read files to diff");
1506 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1507 data->is_binary = 1;
1508 data->added = mf2.size;
1509 data->deleted = mf1.size;
1510 } else {
1511 /* Crazy xdl interfaces.. */
1512 xpparam_t xpp;
1513 xdemitconf_t xecfg;
1514 xdemitcb_t ecb;
1516 memset(&xpp, 0, sizeof(xpp));
1517 memset(&xecfg, 0, sizeof(xecfg));
1518 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1519 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
1520 &xpp, &xecfg, &ecb);
1521 }
1523 free_and_return:
1524 diff_free_filespec_data(one);
1525 diff_free_filespec_data(two);
1526 }
1528 static void builtin_checkdiff(const char *name_a, const char *name_b,
1529 const char *attr_path,
1530 struct diff_filespec *one,
1531 struct diff_filespec *two,
1532 struct diff_options *o)
1533 {
1534 mmfile_t mf1, mf2;
1535 struct checkdiff_t data;
1537 if (!two)
1538 return;
1540 memset(&data, 0, sizeof(data));
1541 data.filename = name_b ? name_b : name_a;
1542 data.lineno = 0;
1543 data.o = o;
1544 data.ws_rule = whitespace_rule(attr_path);
1546 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1547 die("unable to read files to diff");
1549 /*
1550 * All the other codepaths check both sides, but not checking
1551 * the "old" side here is deliberate. We are checking the newly
1552 * introduced changes, and as long as the "new" side is text, we
1553 * can and should check what it introduces.
1554 */
1555 if (diff_filespec_is_binary(two))
1556 goto free_and_return;
1557 else {
1558 /* Crazy xdl interfaces.. */
1559 xpparam_t xpp;
1560 xdemitconf_t xecfg;
1561 xdemitcb_t ecb;
1563 memset(&xpp, 0, sizeof(xpp));
1564 memset(&xecfg, 0, sizeof(xecfg));
1565 xecfg.ctxlen = 1; /* at least one context line */
1566 xpp.flags = XDF_NEED_MINIMAL;
1567 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
1568 &xpp, &xecfg, &ecb);
1570 if ((data.ws_rule & WS_TRAILING_SPACE) &&
1571 data.trailing_blanks_start) {
1572 fprintf(o->file, "%s:%d: ends with blank lines.\n",
1573 data.filename, data.trailing_blanks_start);
1574 data.status = 1; /* report errors */
1575 }
1576 }
1577 free_and_return:
1578 diff_free_filespec_data(one);
1579 diff_free_filespec_data(two);
1580 if (data.status)
1581 DIFF_OPT_SET(o, CHECK_FAILED);
1582 }
1584 struct diff_filespec *alloc_filespec(const char *path)
1585 {
1586 int namelen = strlen(path);
1587 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1589 memset(spec, 0, sizeof(*spec));
1590 spec->path = (char *)(spec + 1);
1591 memcpy(spec->path, path, namelen+1);
1592 spec->count = 1;
1593 spec->is_binary = -1;
1594 return spec;
1595 }
1597 void free_filespec(struct diff_filespec *spec)
1598 {
1599 if (!--spec->count) {
1600 diff_free_filespec_data(spec);
1601 free(spec);
1602 }
1603 }
1605 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1606 unsigned short mode)
1607 {
1608 if (mode) {
1609 spec->mode = canon_mode(mode);
1610 hashcpy(spec->sha1, sha1);
1611 spec->sha1_valid = !is_null_sha1(sha1);
1612 }
1613 }
1615 /*
1616 * Given a name and sha1 pair, if the index tells us the file in
1617 * the work tree has that object contents, return true, so that
1618 * prepare_temp_file() does not have to inflate and extract.
1619 */
1620 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1621 {
1622 struct cache_entry *ce;
1623 struct stat st;
1624 int pos, len;
1626 /* We do not read the cache ourselves here, because the
1627 * benchmark with my previous version that always reads cache
1628 * shows that it makes things worse for diff-tree comparing
1629 * two linux-2.6 kernel trees in an already checked out work
1630 * tree. This is because most diff-tree comparisons deal with
1631 * only a small number of files, while reading the cache is
1632 * expensive for a large project, and its cost outweighs the
1633 * savings we get by not inflating the object to a temporary
1634 * file. Practically, this code only helps when we are used
1635 * by diff-cache --cached, which does read the cache before
1636 * calling us.
1637 */
1638 if (!active_cache)
1639 return 0;
1641 /* We want to avoid the working directory if our caller
1642 * doesn't need the data in a normal file, this system
1643 * is rather slow with its stat/open/mmap/close syscalls,
1644 * and the object is contained in a pack file. The pack
1645 * is probably already open and will be faster to obtain
1646 * the data through than the working directory. Loose
1647 * objects however would tend to be slower as they need
1648 * to be individually opened and inflated.
1649 */
1650 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1651 return 0;
1653 len = strlen(name);
1654 pos = cache_name_pos(name, len);
1655 if (pos < 0)
1656 return 0;
1657 ce = active_cache[pos];
1659 /*
1660 * This is not the sha1 we are looking for, or
1661 * unreusable because it is not a regular file.
1662 */
1663 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1664 return 0;
1666 /*
1667 * If ce matches the file in the work tree, we can reuse it.
1668 */
1669 if (ce_uptodate(ce) ||
1670 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1671 return 1;
1673 return 0;
1674 }
1676 static int populate_from_stdin(struct diff_filespec *s)
1677 {
1678 struct strbuf buf = STRBUF_INIT;
1679 size_t size = 0;
1681 if (strbuf_read(&buf, 0, 0) < 0)
1682 return error("error while reading from stdin %s",
1683 strerror(errno));
1685 s->should_munmap = 0;
1686 s->data = strbuf_detach(&buf, &size);
1687 s->size = size;
1688 s->should_free = 1;
1689 return 0;
1690 }
1692 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1693 {
1694 int len;
1695 char *data = xmalloc(100);
1696 len = snprintf(data, 100,
1697 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1698 s->data = data;
1699 s->size = len;
1700 s->should_free = 1;
1701 if (size_only) {
1702 s->data = NULL;
1703 free(data);
1704 }
1705 return 0;
1706 }
1708 /*
1709 * While doing rename detection and pickaxe operation, we may need to
1710 * grab the data for the blob (or file) for our own in-core comparison.
1711 * diff_filespec has data and size fields for this purpose.
1712 */
1713 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1714 {
1715 int err = 0;
1716 if (!DIFF_FILE_VALID(s))
1717 die("internal error: asking to populate invalid file.");
1718 if (S_ISDIR(s->mode))
1719 return -1;
1721 if (s->data)
1722 return 0;
1724 if (size_only && 0 < s->size)
1725 return 0;
1727 if (S_ISGITLINK(s->mode))
1728 return diff_populate_gitlink(s, size_only);
1730 if (!s->sha1_valid ||
1731 reuse_worktree_file(s->path, s->sha1, 0)) {
1732 struct strbuf buf = STRBUF_INIT;
1733 struct stat st;
1734 int fd;
1736 if (!strcmp(s->path, "-"))
1737 return populate_from_stdin(s);
1739 if (lstat(s->path, &st) < 0) {
1740 if (errno == ENOENT) {
1741 err_empty:
1742 err = -1;
1743 empty:
1744 s->data = (char *)"";
1745 s->size = 0;
1746 return err;
1747 }
1748 }
1749 s->size = xsize_t(st.st_size);
1750 if (!s->size)
1751 goto empty;
1752 if (size_only)
1753 return 0;
1754 if (S_ISLNK(st.st_mode)) {
1755 int ret;
1756 s->data = xmalloc(s->size);
1757 s->should_free = 1;
1758 ret = readlink(s->path, s->data, s->size);
1759 if (ret < 0) {
1760 free(s->data);
1761 goto err_empty;
1762 }
1763 return 0;
1764 }
1765 fd = open(s->path, O_RDONLY);
1766 if (fd < 0)
1767 goto err_empty;
1768 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1769 close(fd);
1770 s->should_munmap = 1;
1772 /*
1773 * Convert from working tree format to canonical git format
1774 */
1775 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
1776 size_t size = 0;
1777 munmap(s->data, s->size);
1778 s->should_munmap = 0;
1779 s->data = strbuf_detach(&buf, &size);
1780 s->size = size;
1781 s->should_free = 1;
1782 }
1783 }
1784 else {
1785 enum object_type type;
1786 if (size_only)
1787 type = sha1_object_info(s->sha1, &s->size);
1788 else {
1789 s->data = read_sha1_file(s->sha1, &type, &s->size);
1790 s->should_free = 1;
1791 }
1792 }
1793 return 0;
1794 }
1796 void diff_free_filespec_blob(struct diff_filespec *s)
1797 {
1798 if (s->should_free)
1799 free(s->data);
1800 else if (s->should_munmap)
1801 munmap(s->data, s->size);
1803 if (s->should_free || s->should_munmap) {
1804 s->should_free = s->should_munmap = 0;
1805 s->data = NULL;
1806 }
1807 }
1809 void diff_free_filespec_data(struct diff_filespec *s)
1810 {
1811 diff_free_filespec_blob(s);
1812 free(s->cnt_data);
1813 s->cnt_data = NULL;
1814 }
1816 static void prep_temp_blob(struct diff_tempfile *temp,
1817 void *blob,
1818 unsigned long size,
1819 const unsigned char *sha1,
1820 int mode)
1821 {
1822 int fd;
1824 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1825 if (fd < 0)
1826 die("unable to create temp-file: %s", strerror(errno));
1827 if (write_in_full(fd, blob, size) != size)
1828 die("unable to write temp-file");
1829 close(fd);
1830 temp->name = temp->tmp_path;
1831 strcpy(temp->hex, sha1_to_hex(sha1));
1832 temp->hex[40] = 0;
1833 sprintf(temp->mode, "%06o", mode);
1834 }
1836 static void prepare_temp_file(const char *name,
1837 struct diff_tempfile *temp,
1838 struct diff_filespec *one)
1839 {
1840 if (!DIFF_FILE_VALID(one)) {
1841 not_a_valid_file:
1842 /* A '-' entry produces this for file-2, and
1843 * a '+' entry produces this for file-1.
1844 */
1845 temp->name = "/dev/null";
1846 strcpy(temp->hex, ".");
1847 strcpy(temp->mode, ".");
1848 return;
1849 }
1851 if (!one->sha1_valid ||
1852 reuse_worktree_file(name, one->sha1, 1)) {
1853 struct stat st;
1854 if (lstat(name, &st) < 0) {
1855 if (errno == ENOENT)
1856 goto not_a_valid_file;
1857 die("stat(%s): %s", name, strerror(errno));
1858 }
1859 if (S_ISLNK(st.st_mode)) {
1860 int ret;
1861 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1862 size_t sz = xsize_t(st.st_size);
1863 if (sizeof(buf) <= st.st_size)
1864 die("symlink too long: %s", name);
1865 ret = readlink(name, buf, sz);
1866 if (ret < 0)
1867 die("readlink(%s)", name);
1868 prep_temp_blob(temp, buf, sz,
1869 (one->sha1_valid ?
1870 one->sha1 : null_sha1),
1871 (one->sha1_valid ?
1872 one->mode : S_IFLNK));
1873 }
1874 else {
1875 /* we can borrow from the file in the work tree */
1876 temp->name = name;
1877 if (!one->sha1_valid)
1878 strcpy(temp->hex, sha1_to_hex(null_sha1));
1879 else
1880 strcpy(temp->hex, sha1_to_hex(one->sha1));
1881 /* Even though we may sometimes borrow the
1882 * contents from the work tree, we always want
1883 * one->mode. mode is trustworthy even when
1884 * !(one->sha1_valid), as long as
1885 * DIFF_FILE_VALID(one).
1886 */
1887 sprintf(temp->mode, "%06o", one->mode);
1888 }
1889 return;
1890 }
1891 else {
1892 if (diff_populate_filespec(one, 0))
1893 die("cannot read data blob for %s", one->path);
1894 prep_temp_blob(temp, one->data, one->size,
1895 one->sha1, one->mode);
1896 }
1897 }
1899 static void remove_tempfile(void)
1900 {
1901 int i;
1903 for (i = 0; i < 2; i++)
1904 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1905 unlink(diff_temp[i].name);
1906 diff_temp[i].name = NULL;
1907 }
1908 }
1910 static void remove_tempfile_on_signal(int signo)
1911 {
1912 remove_tempfile();
1913 signal(SIGINT, SIG_DFL);
1914 raise(signo);
1915 }
1917 /* An external diff command takes:
1918 *
1919 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1920 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1921 *
1922 */
1923 static void run_external_diff(const char *pgm,
1924 const char *name,
1925 const char *other,
1926 struct diff_filespec *one,
1927 struct diff_filespec *two,
1928 const char *xfrm_msg,
1929 int complete_rewrite)
1930 {
1931 const char *spawn_arg[10];
1932 struct diff_tempfile *temp = diff_temp;
1933 int retval;
1934 static int atexit_asked = 0;
1935 const char *othername;
1936 const char **arg = &spawn_arg[0];
1938 othername = (other? other : name);
1939 if (one && two) {
1940 prepare_temp_file(name, &temp[0], one);
1941 prepare_temp_file(othername, &temp[1], two);
1942 if (! atexit_asked &&
1943 (temp[0].name == temp[0].tmp_path ||
1944 temp[1].name == temp[1].tmp_path)) {
1945 atexit_asked = 1;
1946 atexit(remove_tempfile);
1947 }
1948 signal(SIGINT, remove_tempfile_on_signal);
1949 }
1951 if (one && two) {
1952 *arg++ = pgm;
1953 *arg++ = name;
1954 *arg++ = temp[0].name;
1955 *arg++ = temp[0].hex;
1956 *arg++ = temp[0].mode;
1957 *arg++ = temp[1].name;
1958 *arg++ = temp[1].hex;
1959 *arg++ = temp[1].mode;
1960 if (other) {
1961 *arg++ = other;
1962 *arg++ = xfrm_msg;
1963 }
1964 } else {
1965 *arg++ = pgm;
1966 *arg++ = name;
1967 }
1968 *arg = NULL;
1969 fflush(NULL);
1970 retval = run_command_v_opt(spawn_arg, 0);
1971 remove_tempfile();
1972 if (retval) {
1973 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1974 exit(1);
1975 }
1976 }
1978 static void run_diff_cmd(const char *pgm,
1979 const char *name,
1980 const char *other,
1981 const char *attr_path,
1982 struct diff_filespec *one,
1983 struct diff_filespec *two,
1984 const char *xfrm_msg,
1985 struct diff_options *o,
1986 int complete_rewrite)
1987 {
1988 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
1989 pgm = NULL;
1990 else {
1991 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
1992 if (drv && drv->external)
1993 pgm = drv->external;
1994 }
1996 if (pgm) {
1997 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1998 complete_rewrite);
1999 return;
2000 }
2001 if (one && two)
2002 builtin_diff(name, other ? other : name,
2003 one, two, xfrm_msg, o, complete_rewrite);
2004 else
2005 fprintf(o->file, "* Unmerged path %s\n", name);
2006 }
2008 static void diff_fill_sha1_info(struct diff_filespec *one)
2009 {
2010 if (DIFF_FILE_VALID(one)) {
2011 if (!one->sha1_valid) {
2012 struct stat st;
2013 if (!strcmp(one->path, "-")) {
2014 hashcpy(one->sha1, null_sha1);
2015 return;
2016 }
2017 if (lstat(one->path, &st) < 0)
2018 die("stat %s", one->path);
2019 if (index_path(one->sha1, one->path, &st, 0))
2020 die("cannot hash %s\n", one->path);
2021 }
2022 }
2023 else
2024 hashclr(one->sha1);
2025 }
2027 static int similarity_index(struct diff_filepair *p)
2028 {
2029 return p->score * 100 / MAX_SCORE;
2030 }
2032 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2033 {
2034 /* Strip the prefix but do not molest /dev/null and absolute paths */
2035 if (*namep && **namep != '/')
2036 *namep += prefix_length;
2037 if (*otherp && **otherp != '/')
2038 *otherp += prefix_length;
2039 }
2041 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2042 {
2043 const char *pgm = external_diff();
2044 struct strbuf msg;
2045 char *xfrm_msg;
2046 struct diff_filespec *one = p->one;
2047 struct diff_filespec *two = p->two;
2048 const char *name;
2049 const char *other;
2050 const char *attr_path;
2051 int complete_rewrite = 0;
2053 name = p->one->path;
2054 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2055 attr_path = name;
2056 if (o->prefix_length)
2057 strip_prefix(o->prefix_length, &name, &other);
2059 if (DIFF_PAIR_UNMERGED(p)) {
2060 run_diff_cmd(pgm, name, NULL, attr_path,
2061 NULL, NULL, NULL, o, 0);
2062 return;
2063 }
2065 diff_fill_sha1_info(one);
2066 diff_fill_sha1_info(two);
2068 strbuf_init(&msg, PATH_MAX * 2 + 300);
2069 switch (p->status) {
2070 case DIFF_STATUS_COPIED:
2071 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2072 strbuf_addstr(&msg, "\ncopy from ");
2073 quote_c_style(name, &msg, NULL, 0);
2074 strbuf_addstr(&msg, "\ncopy to ");
2075 quote_c_style(other, &msg, NULL, 0);
2076 strbuf_addch(&msg, '\n');
2077 break;
2078 case DIFF_STATUS_RENAMED:
2079 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2080 strbuf_addstr(&msg, "\nrename from ");
2081 quote_c_style(name, &msg, NULL, 0);
2082 strbuf_addstr(&msg, "\nrename to ");
2083 quote_c_style(other, &msg, NULL, 0);
2084 strbuf_addch(&msg, '\n');
2085 break;
2086 case DIFF_STATUS_MODIFIED:
2087 if (p->score) {
2088 strbuf_addf(&msg, "dissimilarity index %d%%\n",
2089 similarity_index(p));
2090 complete_rewrite = 1;
2091 break;
2092 }
2093 /* fallthru */
2094 default:
2095 /* nothing */
2096 ;
2097 }
2099 if (hashcmp(one->sha1, two->sha1)) {
2100 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2102 if (DIFF_OPT_TST(o, BINARY)) {
2103 mmfile_t mf;
2104 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2105 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2106 abbrev = 40;
2107 }
2108 strbuf_addf(&msg, "index %.*s..%.*s",
2109 abbrev, sha1_to_hex(one->sha1),
2110 abbrev, sha1_to_hex(two->sha1));
2111 if (one->mode == two->mode)
2112 strbuf_addf(&msg, " %06o", one->mode);
2113 strbuf_addch(&msg, '\n');
2114 }
2116 if (msg.len)
2117 strbuf_setlen(&msg, msg.len - 1);
2118 xfrm_msg = msg.len ? msg.buf : NULL;
2120 if (!pgm &&
2121 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2122 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2123 /* a filepair that changes between file and symlink
2124 * needs to be split into deletion and creation.
2125 */
2126 struct diff_filespec *null = alloc_filespec(two->path);
2127 run_diff_cmd(NULL, name, other, attr_path,
2128 one, null, xfrm_msg, o, 0);
2129 free(null);
2130 null = alloc_filespec(one->path);
2131 run_diff_cmd(NULL, name, other, attr_path,
2132 null, two, xfrm_msg, o, 0);
2133 free(null);
2134 }
2135 else
2136 run_diff_cmd(pgm, name, other, attr_path,
2137 one, two, xfrm_msg, o, complete_rewrite);
2139 strbuf_release(&msg);
2140 }
2142 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2143 struct diffstat_t *diffstat)
2144 {
2145 const char *name;
2146 const char *other;
2147 int complete_rewrite = 0;
2149 if (DIFF_PAIR_UNMERGED(p)) {
2150 /* unmerged */
2151 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2152 return;
2153 }
2155 name = p->one->path;
2156 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2158 if (o->prefix_length)
2159 strip_prefix(o->prefix_length, &name, &other);
2161 diff_fill_sha1_info(p->one);
2162 diff_fill_sha1_info(p->two);
2164 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2165 complete_rewrite = 1;
2166 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2167 }
2169 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2170 {
2171 const char *name;
2172 const char *other;
2173 const char *attr_path;
2175 if (DIFF_PAIR_UNMERGED(p)) {
2176 /* unmerged */
2177 return;
2178 }
2180 name = p->one->path;
2181 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2182 attr_path = other ? other : name;
2184 if (o->prefix_length)
2185 strip_prefix(o->prefix_length, &name, &other);
2187 diff_fill_sha1_info(p->one);
2188 diff_fill_sha1_info(p->two);
2190 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2191 }
2193 void diff_setup(struct diff_options *options)
2194 {
2195 memset(options, 0, sizeof(*options));
2197 options->file = stdout;
2199 options->line_termination = '\n';
2200 options->break_opt = -1;
2201 options->rename_limit = -1;
2202 options->dirstat_percent = 3;
2203 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
2204 options->context = 3;
2206 options->change = diff_change;
2207 options->add_remove = diff_addremove;
2208 if (diff_use_color_default > 0)
2209 DIFF_OPT_SET(options, COLOR_DIFF);
2210 else
2211 DIFF_OPT_CLR(options, COLOR_DIFF);
2212 options->detect_rename = diff_detect_rename_default;
2214 if (!diff_mnemonic_prefix) {
2215 options->a_prefix = "a/";
2216 options->b_prefix = "b/";
2217 }
2218 }
2220 int diff_setup_done(struct diff_options *options)
2221 {
2222 int count = 0;
2224 if (options->output_format & DIFF_FORMAT_NAME)
2225 count++;
2226 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2227 count++;
2228 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2229 count++;
2230 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2231 count++;
2232 if (count > 1)
2233 die("--name-only, --name-status, --check and -s are mutually exclusive");
2235 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2236 options->detect_rename = DIFF_DETECT_COPY;
2238 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2239 options->prefix = NULL;
2240 if (options->prefix)
2241 options->prefix_length = strlen(options->prefix);
2242 else
2243 options->prefix_length = 0;
2245 if (options->output_format & (DIFF_FORMAT_NAME |
2246 DIFF_FORMAT_NAME_STATUS |
2247 DIFF_FORMAT_CHECKDIFF |
2248 DIFF_FORMAT_NO_OUTPUT))
2249 options->output_format &= ~(DIFF_FORMAT_RAW |
2250 DIFF_FORMAT_NUMSTAT |
2251 DIFF_FORMAT_DIFFSTAT |
2252 DIFF_FORMAT_SHORTSTAT |
2253 DIFF_FORMAT_DIRSTAT |
2254 DIFF_FORMAT_SUMMARY |
2255 DIFF_FORMAT_PATCH);
2257 /*
2258 * These cases always need recursive; we do not drop caller-supplied
2259 * recursive bits for other formats here.
2260 */
2261 if (options->output_format & (DIFF_FORMAT_PATCH |
2262 DIFF_FORMAT_NUMSTAT |
2263 DIFF_FORMAT_DIFFSTAT |
2264 DIFF_FORMAT_SHORTSTAT |
2265 DIFF_FORMAT_DIRSTAT |
2266 DIFF_FORMAT_SUMMARY |
2267 DIFF_FORMAT_CHECKDIFF))
2268 DIFF_OPT_SET(options, RECURSIVE);
2269 /*
2270 * Also pickaxe would not work very well if you do not say recursive
2271 */
2272 if (options->pickaxe)
2273 DIFF_OPT_SET(options, RECURSIVE);
2275 if (options->detect_rename && options->rename_limit < 0)
2276 options->rename_limit = diff_rename_limit_default;
2277 if (options->setup & DIFF_SETUP_USE_CACHE) {
2278 if (!active_cache)
2279 /* read-cache does not die even when it fails
2280 * so it is safe for us to do this here. Also
2281 * it does not smudge active_cache or active_nr
2282 * when it fails, so we do not have to worry about
2283 * cleaning it up ourselves either.
2284 */
2285 read_cache();
2286 }
2287 if (options->abbrev <= 0 || 40 < options->abbrev)
2288 options->abbrev = 40; /* full */
2290 /*
2291 * It does not make sense to show the first hit we happened
2292 * to have found. It does not make sense not to return with
2293 * exit code in such a case either.
2294 */
2295 if (DIFF_OPT_TST(options, QUIET)) {
2296 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2297 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2298 }
2300 return 0;
2301 }
2303 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2304 {
2305 char c, *eq;
2306 int len;
2308 if (*arg != '-')
2309 return 0;
2310 c = *++arg;
2311 if (!c)
2312 return 0;
2313 if (c == arg_short) {
2314 c = *++arg;
2315 if (!c)
2316 return 1;
2317 if (val && isdigit(c)) {
2318 char *end;
2319 int n = strtoul(arg, &end, 10);
2320 if (*end)
2321 return 0;
2322 *val = n;
2323 return 1;
2324 }
2325 return 0;
2326 }
2327 if (c != '-')
2328 return 0;
2329 arg++;
2330 eq = strchr(arg, '=');
2331 if (eq)
2332 len = eq - arg;
2333 else
2334 len = strlen(arg);
2335 if (!len || strncmp(arg, arg_long, len))
2336 return 0;
2337 if (eq) {
2338 int n;
2339 char *end;
2340 if (!isdigit(*++eq))
2341 return 0;
2342 n = strtoul(eq, &end, 10);
2343 if (*end)
2344 return 0;
2345 *val = n;
2346 }
2347 return 1;
2348 }
2350 static int diff_scoreopt_parse(const char *opt);
2352 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2353 {
2354 const char *arg = av[0];
2356 /* Output format options */
2357 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2358 options->output_format |= DIFF_FORMAT_PATCH;
2359 else if (opt_arg(arg, 'U', "unified", &options->context))
2360 options->output_format |= DIFF_FORMAT_PATCH;
2361 else if (!strcmp(arg, "--raw"))
2362 options->output_format |= DIFF_FORMAT_RAW;
2363 else if (!strcmp(arg, "--patch-with-raw"))
2364 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2365 else if (!strcmp(arg, "--numstat"))
2366 options->output_format |= DIFF_FORMAT_NUMSTAT;
2367 else if (!strcmp(arg, "--shortstat"))
2368 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2369 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2370 options->output_format |= DIFF_FORMAT_DIRSTAT;
2371 else if (!strcmp(arg, "--cumulative")) {
2372 options->output_format |= DIFF_FORMAT_DIRSTAT;
2373 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
2374 } else if (opt_arg(arg, 0, "dirstat-by-file",
2375 &options->dirstat_percent)) {
2376 options->output_format |= DIFF_FORMAT_DIRSTAT;
2377 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
2378 }
2379 else if (!strcmp(arg, "--check"))
2380 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2381 else if (!strcmp(arg, "--summary"))
2382 options->output_format |= DIFF_FORMAT_SUMMARY;
2383 else if (!strcmp(arg, "--patch-with-stat"))
2384 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2385 else if (!strcmp(arg, "--name-only"))
2386 options->output_format |= DIFF_FORMAT_NAME;
2387 else if (!strcmp(arg, "--name-status"))
2388 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2389 else if (!strcmp(arg, "-s"))
2390 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2391 else if (!prefixcmp(arg, "--stat")) {
2392 char *end;
2393 int width = options->stat_width;
2394 int name_width = options->stat_name_width;
2395 arg += 6;
2396 end = (char *)arg;
2398 switch (*arg) {
2399 case '-':
2400 if (!prefixcmp(arg, "-width="))
2401 width = strtoul(arg + 7, &end, 10);
2402 else if (!prefixcmp(arg, "-name-width="))
2403 name_width = strtoul(arg + 12, &end, 10);
2404 break;
2405 case '=':
2406 width = strtoul(arg+1, &end, 10);
2407 if (*end == ',')
2408 name_width = strtoul(end+1, &end, 10);
2409 }
2411 /* Important! This checks all the error cases! */
2412 if (*end)
2413 return 0;
2414 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2415 options->stat_name_width = name_width;
2416 options->stat_width = width;
2417 }
2419 /* renames options */
2420 else if (!prefixcmp(arg, "-B")) {
2421 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2422 return -1;
2423 }
2424 else if (!prefixcmp(arg, "-M")) {
2425 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2426 return -1;
2427 options->detect_rename = DIFF_DETECT_RENAME;
2428 }
2429 else if (!prefixcmp(arg, "-C")) {
2430 if (options->detect_rename == DIFF_DETECT_COPY)
2431 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2432 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2433 return -1;
2434 options->detect_rename = DIFF_DETECT_COPY;
2435 }
2436 else if (!strcmp(arg, "--no-renames"))
2437 options->detect_rename = 0;
2438 else if (!strcmp(arg, "--relative"))
2439 DIFF_OPT_SET(options, RELATIVE_NAME);
2440 else if (!prefixcmp(arg, "--relative=")) {
2441 DIFF_OPT_SET(options, RELATIVE_NAME);
2442 options->prefix = arg + 11;
2443 }
2445 /* xdiff options */
2446 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2447 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2448 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2449 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2450 else if (!strcmp(arg, "--ignore-space-at-eol"))
2451 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2453 /* flags options */
2454 else if (!strcmp(arg, "--binary")) {
2455 options->output_format |= DIFF_FORMAT_PATCH;
2456 DIFF_OPT_SET(options, BINARY);
2457 }
2458 else if (!strcmp(arg, "--full-index"))
2459 DIFF_OPT_SET(options, FULL_INDEX);
2460 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2461 DIFF_OPT_SET(options, TEXT);
2462 else if (!strcmp(arg, "-R"))
2463 DIFF_OPT_SET(options, REVERSE_DIFF);
2464 else if (!strcmp(arg, "--find-copies-harder"))
2465 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2466 else if (!strcmp(arg, "--follow"))
2467 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2468 else if (!strcmp(arg, "--color"))
2469 DIFF_OPT_SET(options, COLOR_DIFF);
2470 else if (!strcmp(arg, "--no-color"))
2471 DIFF_OPT_CLR(options, COLOR_DIFF);
2472 else if (!strcmp(arg, "--color-words"))
2473 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2474 else if (!strcmp(arg, "--exit-code"))
2475 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2476 else if (!strcmp(arg, "--quiet"))
2477 DIFF_OPT_SET(options, QUIET);
2478 else if (!strcmp(arg, "--ext-diff"))
2479 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2480 else if (!strcmp(arg, "--no-ext-diff"))
2481 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2482 else if (!strcmp(arg, "--textconv"))
2483 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
2484 else if (!strcmp(arg, "--no-textconv"))
2485 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
2486 else if (!strcmp(arg, "--ignore-submodules"))
2487 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2489 /* misc options */
2490 else if (!strcmp(arg, "-z"))
2491 options->line_termination = 0;
2492 else if (!prefixcmp(arg, "-l"))
2493 options->rename_limit = strtoul(arg+2, NULL, 10);
2494 else if (!prefixcmp(arg, "-S"))
2495 options->pickaxe = arg + 2;
2496 else if (!strcmp(arg, "--pickaxe-all"))
2497 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2498 else if (!strcmp(arg, "--pickaxe-regex"))
2499 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2500 else if (!prefixcmp(arg, "-O"))
2501 options->orderfile = arg + 2;
2502 else if (!prefixcmp(arg, "--diff-filter="))
2503 options->filter = arg + 14;
2504 else if (!strcmp(arg, "--abbrev"))
2505 options->abbrev = DEFAULT_ABBREV;
2506 else if (!prefixcmp(arg, "--abbrev=")) {
2507 options->abbrev = strtoul(arg + 9, NULL, 10);
2508 if (options->abbrev < MINIMUM_ABBREV)
2509 options->abbrev = MINIMUM_ABBREV;
2510 else if (40 < options->abbrev)
2511 options->abbrev = 40;
2512 }
2513 else if (!prefixcmp(arg, "--src-prefix="))
2514 options->a_prefix = arg + 13;
2515 else if (!prefixcmp(arg, "--dst-prefix="))
2516 options->b_prefix = arg + 13;
2517 else if (!strcmp(arg, "--no-prefix"))
2518 options->a_prefix = options->b_prefix = "";
2519 else if (!prefixcmp(arg, "--output=")) {
2520 options->file = fopen(arg + strlen("--output="), "w");
2521 options->close_file = 1;
2522 } else
2523 return 0;
2524 return 1;
2525 }
2527 static int parse_num(const char **cp_p)
2528 {
2529 unsigned long num, scale;
2530 int ch, dot;
2531 const char *cp = *cp_p;
2533 num = 0;
2534 scale = 1;
2535 dot = 0;
2536 for(;;) {
2537 ch = *cp;
2538 if ( !dot && ch == '.' ) {
2539 scale = 1;
2540 dot = 1;
2541 } else if ( ch == '%' ) {
2542 scale = dot ? scale*100 : 100;
2543 cp++; /* % is always at the end */
2544 break;
2545 } else if ( ch >= '0' && ch <= '9' ) {
2546 if ( scale < 100000 ) {
2547 scale *= 10;
2548 num = (num*10) + (ch-'0');
2549 }
2550 } else {
2551 break;
2552 }
2553 cp++;
2554 }
2555 *cp_p = cp;
2557 /* user says num divided by scale and we say internally that
2558 * is MAX_SCORE * num / scale.
2559 */
2560 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2561 }
2563 static int diff_scoreopt_parse(const char *opt)
2564 {
2565 int opt1, opt2, cmd;
2567 if (*opt++ != '-')
2568 return -1;
2569 cmd = *opt++;
2570 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2571 return -1; /* that is not a -M, -C nor -B option */
2573 opt1 = parse_num(&opt);
2574 if (cmd != 'B')
2575 opt2 = 0;
2576 else {
2577 if (*opt == 0)
2578 opt2 = 0;
2579 else if (*opt != '/')
2580 return -1; /* we expect -B80/99 or -B80 */
2581 else {
2582 opt++;
2583 opt2 = parse_num(&opt);
2584 }
2585 }
2586 if (*opt != 0)
2587 return -1;
2588 return opt1 | (opt2 << 16);
2589 }
2591 struct diff_queue_struct diff_queued_diff;
2593 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2594 {
2595 if (queue->alloc <= queue->nr) {
2596 queue->alloc = alloc_nr(queue->alloc);
2597 queue->queue = xrealloc(queue->queue,
2598 sizeof(dp) * queue->alloc);
2599 }
2600 queue->queue[queue->nr++] = dp;
2601 }
2603 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2604 struct diff_filespec *one,
2605 struct diff_filespec *two)
2606 {
2607 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2608 dp->one = one;
2609 dp->two = two;
2610 if (queue)
2611 diff_q(queue, dp);
2612 return dp;
2613 }
2615 void diff_free_filepair(struct diff_filepair *p)
2616 {
2617 free_filespec(p->one);
2618 free_filespec(p->two);
2619 free(p);
2620 }
2622 /* This is different from find_unique_abbrev() in that
2623 * it stuffs the result with dots for alignment.
2624 */
2625 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2626 {
2627 int abblen;
2628 const char *abbrev;
2629 if (len == 40)
2630 return sha1_to_hex(sha1);
2632 abbrev = find_unique_abbrev(sha1, len);
2633 abblen = strlen(abbrev);
2634 if (abblen < 37) {
2635 static char hex[41];
2636 if (len < abblen && abblen <= len + 2)
2637 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2638 else
2639 sprintf(hex, "%s...", abbrev);
2640 return hex;
2641 }
2642 return sha1_to_hex(sha1);
2643 }
2645 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2646 {
2647 int line_termination = opt->line_termination;
2648 int inter_name_termination = line_termination ? '\t' : '\0';
2650 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2651 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2652 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2653 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2654 }
2655 if (p->score) {
2656 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2657 inter_name_termination);
2658 } else {
2659 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
2660 }
2662 if (p->status == DIFF_STATUS_COPIED ||
2663 p->status == DIFF_STATUS_RENAMED) {
2664 const char *name_a, *name_b;
2665 name_a = p->one->path;
2666 name_b = p->two->path;
2667 strip_prefix(opt->prefix_length, &name_a, &name_b);
2668 write_name_quoted(name_a, opt->file, inter_name_termination);
2669 write_name_quoted(name_b, opt->file, line_termination);
2670 } else {
2671 const char *name_a, *name_b;
2672 name_a = p->one->mode ? p->one->path : p->two->path;
2673 name_b = NULL;
2674 strip_prefix(opt->prefix_length, &name_a, &name_b);
2675 write_name_quoted(name_a, opt->file, line_termination);
2676 }
2677 }
2679 int diff_unmodified_pair(struct diff_filepair *p)
2680 {
2681 /* This function is written stricter than necessary to support
2682 * the currently implemented transformers, but the idea is to
2683 * let transformers to produce diff_filepairs any way they want,
2684 * and filter and clean them up here before producing the output.
2685 */
2686 struct diff_filespec *one = p->one, *two = p->two;
2688 if (DIFF_PAIR_UNMERGED(p))
2689 return 0; /* unmerged is interesting */
2691 /* deletion, addition, mode or type change
2692 * and rename are all interesting.
2693 */
2694 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2695 DIFF_PAIR_MODE_CHANGED(p) ||
2696 strcmp(one->path, two->path))
2697 return 0;
2699 /* both are valid and point at the same path. that is, we are
2700 * dealing with a change.
2701 */
2702 if (one->sha1_valid && two->sha1_valid &&
2703 !hashcmp(one->sha1, two->sha1))
2704 return 1; /* no change */
2705 if (!one->sha1_valid && !two->sha1_valid)
2706 return 1; /* both look at the same file on the filesystem. */
2707 return 0;
2708 }
2710 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2711 {
2712 if (diff_unmodified_pair(p))
2713 return;
2715 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2716 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2717 return; /* no tree diffs in patch format */
2719 run_diff(p, o);
2720 }
2722 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2723 struct diffstat_t *diffstat)
2724 {
2725 if (diff_unmodified_pair(p))
2726 return;
2728 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2729 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2730 return; /* no tree diffs in patch format */
2732 run_diffstat(p, o, diffstat);
2733 }
2735 static void diff_flush_checkdiff(struct diff_filepair *p,
2736 struct diff_options *o)
2737 {
2738 if (diff_unmodified_pair(p))
2739 return;
2741 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2742 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2743 return; /* no tree diffs in patch format */
2745 run_checkdiff(p, o);
2746 }
2748 int diff_queue_is_empty(void)
2749 {
2750 struct diff_queue_struct *q = &diff_queued_diff;
2751 int i;
2752 for (i = 0; i < q->nr; i++)
2753 if (!diff_unmodified_pair(q->queue[i]))
2754 return 0;
2755 return 1;
2756 }
2758 #if DIFF_DEBUG
2759 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2760 {
2761 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2762 x, one ? one : "",
2763 s->path,
2764 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2765 s->mode,
2766 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2767 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2768 x, one ? one : "",
2769 s->size, s->xfrm_flags);
2770 }
2772 void diff_debug_filepair(const struct diff_filepair *p, int i)
2773 {
2774 diff_debug_filespec(p->one, i, "one");
2775 diff_debug_filespec(p->two, i, "two");
2776 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2777 p->score, p->status ? p->status : '?',
2778 p->one->rename_used, p->broken_pair);
2779 }
2781 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2782 {
2783 int i;
2784 if (msg)
2785 fprintf(stderr, "%s\n", msg);
2786 fprintf(stderr, "q->nr = %d\n", q->nr);
2787 for (i = 0; i < q->nr; i++) {
2788 struct diff_filepair *p = q->queue[i];
2789 diff_debug_filepair(p, i);
2790 }
2791 }
2792 #endif
2794 static void diff_resolve_rename_copy(void)
2795 {
2796 int i;
2797 struct diff_filepair *p;
2798 struct diff_queue_struct *q = &diff_queued_diff;
2800 diff_debug_queue("resolve-rename-copy", q);
2802 for (i = 0; i < q->nr; i++) {
2803 p = q->queue[i];
2804 p->status = 0; /* undecided */
2805 if (DIFF_PAIR_UNMERGED(p))
2806 p->status = DIFF_STATUS_UNMERGED;
2807 else if (!DIFF_FILE_VALID(p->one))
2808 p->status = DIFF_STATUS_ADDED;
2809 else if (!DIFF_FILE_VALID(p->two))
2810 p->status = DIFF_STATUS_DELETED;
2811 else if (DIFF_PAIR_TYPE_CHANGED(p))
2812 p->status = DIFF_STATUS_TYPE_CHANGED;
2814 /* from this point on, we are dealing with a pair
2815 * whose both sides are valid and of the same type, i.e.
2816 * either in-place edit or rename/copy edit.
2817 */
2818 else if (DIFF_PAIR_RENAME(p)) {
2819 /*
2820 * A rename might have re-connected a broken
2821 * pair up, causing the pathnames to be the
2822 * same again. If so, that's not a rename at
2823 * all, just a modification..
2824 *
2825 * Otherwise, see if this source was used for
2826 * multiple renames, in which case we decrement
2827 * the count, and call it a copy.
2828 */
2829 if (!strcmp(p->one->path, p->two->path))
2830 p->status = DIFF_STATUS_MODIFIED;
2831 else if (--p->one->rename_used > 0)
2832 p->status = DIFF_STATUS_COPIED;
2833 else
2834 p->status = DIFF_STATUS_RENAMED;
2835 }
2836 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2837 p->one->mode != p->two->mode ||
2838 is_null_sha1(p->one->sha1))
2839 p->status = DIFF_STATUS_MODIFIED;
2840 else {
2841 /* This is a "no-change" entry and should not
2842 * happen anymore, but prepare for broken callers.
2843 */
2844 error("feeding unmodified %s to diffcore",
2845 p->one->path);
2846 p->status = DIFF_STATUS_UNKNOWN;
2847 }
2848 }
2849 diff_debug_queue("resolve-rename-copy done", q);
2850 }
2852 static int check_pair_status(struct diff_filepair *p)
2853 {
2854 switch (p->status) {
2855 case DIFF_STATUS_UNKNOWN:
2856 return 0;
2857 case 0:
2858 die("internal error in diff-resolve-rename-copy");
2859 default:
2860 return 1;
2861 }
2862 }
2864 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2865 {
2866 int fmt = opt->output_format;
2868 if (fmt & DIFF_FORMAT_CHECKDIFF)
2869 diff_flush_checkdiff(p, opt);
2870 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2871 diff_flush_raw(p, opt);
2872 else if (fmt & DIFF_FORMAT_NAME) {
2873 const char *name_a, *name_b;
2874 name_a = p->two->path;
2875 name_b = NULL;
2876 strip_prefix(opt->prefix_length, &name_a, &name_b);
2877 write_name_quoted(name_a, opt->file, opt->line_termination);
2878 }
2879 }
2881 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
2882 {
2883 if (fs->mode)
2884 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
2885 else
2886 fprintf(file, " %s ", newdelete);
2887 write_name_quoted(fs->path, file, '\n');
2888 }
2891 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
2892 {
2893 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2894 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
2895 show_name ? ' ' : '\n');
2896 if (show_name) {
2897 write_name_quoted(p->two->path, file, '\n');
2898 }
2899 }
2900 }
2902 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
2903 {
2904 char *names = pprint_rename(p->one->path, p->two->path);
2906 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2907 free(names);
2908 show_mode_change(file, p, 0);
2909 }
2911 static void diff_summary(FILE *file, struct diff_filepair *p)
2912 {
2913 switch(p->status) {
2914 case DIFF_STATUS_DELETED:
2915 show_file_mode_name(file, "delete", p->one);
2916 break;
2917 case DIFF_STATUS_ADDED:
2918 show_file_mode_name(file, "create", p->two);
2919 break;
2920 case DIFF_STATUS_COPIED:
2921 show_rename_copy(file, "copy", p);
2922 break;
2923 case DIFF_STATUS_RENAMED:
2924 show_rename_copy(file, "rename", p);
2925 break;
2926 default:
2927 if (p->score) {
2928 fputs(" rewrite ", file);
2929 write_name_quoted(p->two->path, file, ' ');
2930 fprintf(file, "(%d%%)\n", similarity_index(p));
2931 }
2932 show_mode_change(file, p, !p->score);
2933 break;
2934 }
2935 }
2937 struct patch_id_t {
2938 git_SHA_CTX *ctx;
2939 int patchlen;
2940 };
2942 static int remove_space(char *line, int len)
2943 {
2944 int i;
2945 char *dst = line;
2946 unsigned char c;
2948 for (i = 0; i < len; i++)
2949 if (!isspace((c = line[i])))
2950 *dst++ = c;
2952 return dst - line;
2953 }
2955 static void patch_id_consume(void *priv, char *line, unsigned long len)
2956 {
2957 struct patch_id_t *data = priv;
2958 int new_len;
2960 /* Ignore line numbers when computing the SHA1 of the patch */
2961 if (!prefixcmp(line, "@@ -"))
2962 return;
2964 new_len = remove_space(line, len);
2966 git_SHA1_Update(data->ctx, line, new_len);
2967 data->patchlen += new_len;
2968 }
2970 /* returns 0 upon success, and writes result into sha1 */
2971 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2972 {
2973 struct diff_queue_struct *q = &diff_queued_diff;
2974 int i;
2975 git_SHA_CTX ctx;
2976 struct patch_id_t data;
2977 char buffer[PATH_MAX * 4 + 20];
2979 git_SHA1_Init(&ctx);
2980 memset(&data, 0, sizeof(struct patch_id_t));
2981 data.ctx = &ctx;
2983 for (i = 0; i < q->nr; i++) {
2984 xpparam_t xpp;
2985 xdemitconf_t xecfg;
2986 xdemitcb_t ecb;
2987 mmfile_t mf1, mf2;
2988 struct diff_filepair *p = q->queue[i];
2989 int len1, len2;
2991 memset(&xpp, 0, sizeof(xpp));
2992 memset(&xecfg, 0, sizeof(xecfg));
2993 if (p->status == 0)
2994 return error("internal diff status error");
2995 if (p->status == DIFF_STATUS_UNKNOWN)
2996 continue;
2997 if (diff_unmodified_pair(p))
2998 continue;
2999 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3000 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3001 continue;
3002 if (DIFF_PAIR_UNMERGED(p))
3003 continue;
3005 diff_fill_sha1_info(p->one);
3006 diff_fill_sha1_info(p->two);
3007 if (fill_mmfile(&mf1, p->one) < 0 ||
3008 fill_mmfile(&mf2, p->two) < 0)
3009 return error("unable to read files to diff");
3011 len1 = remove_space(p->one->path, strlen(p->one->path));
3012 len2 = remove_space(p->two->path, strlen(p->two->path));
3013 if (p->one->mode == 0)
3014 len1 = snprintf(buffer, sizeof(buffer),
3015 "diff--gita/%.*sb/%.*s"
3016 "newfilemode%06o"
3017 "---/dev/null"
3018 "+++b/%.*s",
3019 len1, p->one->path,
3020 len2, p->two->path,
3021 p->two->mode,
3022 len2, p->two->path);
3023 else if (p->two->mode == 0)
3024 len1 = snprintf(buffer, sizeof(buffer),
3025 "diff--gita/%.*sb/%.*s"
3026 "deletedfilemode%06o"
3027 "---a/%.*s"
3028 "+++/dev/null",
3029 len1, p->one->path,
3030 len2, p->two->path,
3031 p->one->mode,
3032 len1, p->one->path);
3033 else
3034 len1 = snprintf(buffer, sizeof(buffer),
3035 "diff--gita/%.*sb/%.*s"
3036 "---a/%.*s"
3037 "+++b/%.*s",
3038 len1, p->one->path,
3039 len2, p->two->path,
3040 len1, p->one->path,
3041 len2, p->two->path);
3042 git_SHA1_Update(&ctx, buffer, len1);
3044 xpp.flags = XDF_NEED_MINIMAL;
3045 xecfg.ctxlen = 3;
3046 xecfg.flags = XDL_EMIT_FUNCNAMES;
3047 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3048 &xpp, &xecfg, &ecb);
3049 }
3051 git_SHA1_Final(sha1, &ctx);
3052 return 0;
3053 }
3055 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3056 {
3057 struct diff_queue_struct *q = &diff_queued_diff;
3058 int i;
3059 int result = diff_get_patch_id(options, sha1);
3061 for (i = 0; i < q->nr; i++)
3062 diff_free_filepair(q->queue[i]);
3064 free(q->queue);
3065 q->queue = NULL;
3066 q->nr = q->alloc = 0;
3068 return result;
3069 }
3071 static int is_summary_empty(const struct diff_queue_struct *q)
3072 {
3073 int i;
3075 for (i = 0; i < q->nr; i++) {
3076 const struct diff_filepair *p = q->queue[i];
3078 switch (p->status) {
3079 case DIFF_STATUS_DELETED:
3080 case DIFF_STATUS_ADDED:
3081 case DIFF_STATUS_COPIED:
3082 case DIFF_STATUS_RENAMED:
3083 return 0;
3084 default:
3085 if (p->score)
3086 return 0;
3087 if (p->one->mode && p->two->mode &&
3088 p->one->mode != p->two->mode)
3089 return 0;
3090 break;
3091 }
3092 }
3093 return 1;
3094 }
3096 void diff_flush(struct diff_options *options)
3097 {
3098 struct diff_queue_struct *q = &diff_queued_diff;
3099 int i, output_format = options->output_format;
3100 int separator = 0;
3102 /*
3103 * Order: raw, stat, summary, patch
3104 * or: name/name-status/checkdiff (other bits clear)
3105 */
3106 if (!q->nr)
3107 goto free_queue;
3109 if (output_format & (DIFF_FORMAT_RAW |
3110 DIFF_FORMAT_NAME |
3111 DIFF_FORMAT_NAME_STATUS |
3112 DIFF_FORMAT_CHECKDIFF)) {
3113 for (i = 0; i < q->nr; i++) {
3114 struct diff_filepair *p = q->queue[i];
3115 if (check_pair_status(p))
3116 flush_one_pair(p, options);
3117 }
3118 separator++;
3119 }
3121 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3122 struct diffstat_t diffstat;
3124 memset(&diffstat, 0, sizeof(struct diffstat_t));
3125 for (i = 0; i < q->nr; i++) {
3126 struct diff_filepair *p = q->queue[i];
3127 if (check_pair_status(p))
3128 diff_flush_stat(p, options, &diffstat);
3129 }
3130 if (output_format & DIFF_FORMAT_NUMSTAT)
3131 show_numstat(&diffstat, options);
3132 if (output_format & DIFF_FORMAT_DIFFSTAT)
3133 show_stats(&diffstat, options);
3134 if (output_format & DIFF_FORMAT_SHORTSTAT)
3135 show_shortstats(&diffstat, options);
3136 free_diffstat_info(&diffstat);
3137 separator++;
3138 }
3139 if (output_format & DIFF_FORMAT_DIRSTAT)
3140 show_dirstat(options);
3142 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3143 for (i = 0; i < q->nr; i++)
3144 diff_summary(options->file, q->queue[i]);
3145 separator++;
3146 }
3148 if (output_format & DIFF_FORMAT_PATCH) {
3149 if (separator) {
3150 putc(options->line_termination, options->file);
3151 if (options->stat_sep) {
3152 /* attach patch instead of inline */
3153 fputs(options->stat_sep, options->file);
3154 }
3155 }
3157 for (i = 0; i < q->nr; i++) {
3158 struct diff_filepair *p = q->queue[i];
3159 if (check_pair_status(p))
3160 diff_flush_patch(p, options);
3161 }
3162 }
3164 if (output_format & DIFF_FORMAT_CALLBACK)
3165 options->format_callback(q, options, options->format_callback_data);
3167 for (i = 0; i < q->nr; i++)
3168 diff_free_filepair(q->queue[i]);
3169 free_queue:
3170 free(q->queue);
3171 q->queue = NULL;
3172 q->nr = q->alloc = 0;
3173 if (options->close_file)
3174 fclose(options->file);
3175 }
3177 static void diffcore_apply_filter(const char *filter)
3178 {
3179 int i;
3180 struct diff_queue_struct *q = &diff_queued_diff;
3181 struct diff_queue_struct outq;
3182 outq.queue = NULL;
3183 outq.nr = outq.alloc = 0;
3185 if (!filter)
3186 return;
3188 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3189 int found;
3190 for (i = found = 0; !found && i < q->nr; i++) {
3191 struct diff_filepair *p = q->queue[i];
3192 if (((p->status == DIFF_STATUS_MODIFIED) &&
3193 ((p->score &&
3194 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3195 (!p->score &&
3196 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3197 ((p->status != DIFF_STATUS_MODIFIED) &&
3198 strchr(filter, p->status)))
3199 found++;
3200 }
3201 if (found)
3202 return;
3204 /* otherwise we will clear the whole queue
3205 * by copying the empty outq at the end of this
3206 * function, but first clear the current entries
3207 * in the queue.
3208 */
3209 for (i = 0; i < q->nr; i++)
3210 diff_free_filepair(q->queue[i]);
3211 }
3212 else {
3213 /* Only the matching ones */
3214 for (i = 0; i < q->nr; i++) {
3215 struct diff_filepair *p = q->queue[i];
3217 if (((p->status == DIFF_STATUS_MODIFIED) &&
3218 ((p->score &&
3219 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3220 (!p->score &&
3221 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3222 ((p->status != DIFF_STATUS_MODIFIED) &&
3223 strchr(filter, p->status)))
3224 diff_q(&outq, p);
3225 else
3226 diff_free_filepair(p);
3227 }
3228 }
3229 free(q->queue);
3230 *q = outq;
3231 }
3233 /* Check whether two filespecs with the same mode and size are identical */
3234 static int diff_filespec_is_identical(struct diff_filespec *one,
3235 struct diff_filespec *two)
3236 {
3237 if (S_ISGITLINK(one->mode))
3238 return 0;
3239 if (diff_populate_filespec(one, 0))
3240 return 0;
3241 if (diff_populate_filespec(two, 0))
3242 return 0;
3243 return !memcmp(one->data, two->data, one->size);
3244 }
3246 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3247 {
3248 int i;
3249 struct diff_queue_struct *q = &diff_queued_diff;
3250 struct diff_queue_struct outq;
3251 outq.queue = NULL;
3252 outq.nr = outq.alloc = 0;
3254 for (i = 0; i < q->nr; i++) {
3255 struct diff_filepair *p = q->queue[i];
3257 /*
3258 * 1. Entries that come from stat info dirtyness
3259 * always have both sides (iow, not create/delete),
3260 * one side of the object name is unknown, with
3261 * the same mode and size. Keep the ones that
3262 * do not match these criteria. They have real
3263 * differences.
3264 *
3265 * 2. At this point, the file is known to be modified,
3266 * with the same mode and size, and the object
3267 * name of one side is unknown. Need to inspect
3268 * the identical contents.
3269 */
3270 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3271 !DIFF_FILE_VALID(p->two) ||
3272 (p->one->sha1_valid && p->two->sha1_valid) ||
3273 (p->one->mode != p->two->mode) ||
3274 diff_populate_filespec(p->one, 1) ||
3275 diff_populate_filespec(p->two, 1) ||
3276 (p->one->size != p->two->size) ||
3277 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3278 diff_q(&outq, p);
3279 else {
3280 /*
3281 * The caller can subtract 1 from skip_stat_unmatch
3282 * to determine how many paths were dirty only
3283 * due to stat info mismatch.
3284 */
3285 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3286 diffopt->skip_stat_unmatch++;
3287 diff_free_filepair(p);
3288 }
3289 }
3290 free(q->queue);
3291 *q = outq;
3292 }
3294 void diffcore_std(struct diff_options *options)
3295 {
3296 if (options->skip_stat_unmatch)
3297 diffcore_skip_stat_unmatch(options);
3298 if (options->break_opt != -1)
3299 diffcore_break(options->break_opt);
3300 if (options->detect_rename)
3301 diffcore_rename(options);
3302 if (options->break_opt != -1)
3303 diffcore_merge_broken();
3304 if (options->pickaxe)
3305 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3306 if (options->orderfile)
3307 diffcore_order(options->orderfile);
3308 diff_resolve_rename_copy();
3309 diffcore_apply_filter(options->filter);
3311 if (diff_queued_diff.nr)
3312 DIFF_OPT_SET(options, HAS_CHANGES);
3313 else
3314 DIFF_OPT_CLR(options, HAS_CHANGES);
3315 }
3317 int diff_result_code(struct diff_options *opt, int status)
3318 {
3319 int result = 0;
3320 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3321 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3322 return status;
3323 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3324 DIFF_OPT_TST(opt, HAS_CHANGES))
3325 result |= 01;
3326 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3327 DIFF_OPT_TST(opt, CHECK_FAILED))
3328 result |= 02;
3329 return result;
3330 }
3332 void diff_addremove(struct diff_options *options,
3333 int addremove, unsigned mode,
3334 const unsigned char *sha1,
3335 const char *concatpath)
3336 {
3337 struct diff_filespec *one, *two;
3339 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3340 return;
3342 /* This may look odd, but it is a preparation for
3343 * feeding "there are unchanged files which should
3344 * not produce diffs, but when you are doing copy
3345 * detection you would need them, so here they are"
3346 * entries to the diff-core. They will be prefixed
3347 * with something like '=' or '*' (I haven't decided
3348 * which but should not make any difference).
3349 * Feeding the same new and old to diff_change()
3350 * also has the same effect.
3351 * Before the final output happens, they are pruned after
3352 * merged into rename/copy pairs as appropriate.
3353 */
3354 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3355 addremove = (addremove == '+' ? '-' :
3356 addremove == '-' ? '+' : addremove);
3358 if (options->prefix &&
3359 strncmp(concatpath, options->prefix, options->prefix_length))
3360 return;
3362 one = alloc_filespec(concatpath);
3363 two = alloc_filespec(concatpath);
3365 if (addremove != '+')
3366 fill_filespec(one, sha1, mode);
3367 if (addremove != '-')
3368 fill_filespec(two, sha1, mode);
3370 diff_queue(&diff_queued_diff, one, two);
3371 DIFF_OPT_SET(options, HAS_CHANGES);
3372 }
3374 void diff_change(struct diff_options *options,
3375 unsigned old_mode, unsigned new_mode,
3376 const unsigned char *old_sha1,
3377 const unsigned char *new_sha1,
3378 const char *concatpath)
3379 {
3380 struct diff_filespec *one, *two;
3382 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3383 && S_ISGITLINK(new_mode))
3384 return;
3386 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3387 unsigned tmp;
3388 const unsigned char *tmp_c;
3389 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3390 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3391 }
3393 if (options->prefix &&
3394 strncmp(concatpath, options->prefix, options->prefix_length))
3395 return;
3397 one = alloc_filespec(concatpath);
3398 two = alloc_filespec(concatpath);
3399 fill_filespec(one, old_sha1, old_mode);
3400 fill_filespec(two, new_sha1, new_mode);
3402 diff_queue(&diff_queued_diff, one, two);
3403 DIFF_OPT_SET(options, HAS_CHANGES);
3404 }
3406 void diff_unmerge(struct diff_options *options,
3407 const char *path,
3408 unsigned mode, const unsigned char *sha1)
3409 {
3410 struct diff_filespec *one, *two;
3412 if (options->prefix &&
3413 strncmp(path, options->prefix, options->prefix_length))
3414 return;
3416 one = alloc_filespec(path);
3417 two = alloc_filespec(path);
3418 fill_filespec(one, sha1, mode);
3419 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3420 }
3422 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
3423 size_t *outsize)
3424 {
3425 struct diff_tempfile temp;
3426 const char *argv[3];
3427 const char **arg = argv;
3428 struct child_process child;
3429 struct strbuf buf = STRBUF_INIT;
3431 prepare_temp_file(spec->path, &temp, spec);
3432 *arg++ = pgm;
3433 *arg++ = temp.name;
3434 *arg = NULL;
3436 memset(&child, 0, sizeof(child));
3437 child.argv = argv;
3438 child.out = -1;
3439 if (start_command(&child) != 0 ||
3440 strbuf_read(&buf, child.out, 0) < 0 ||
3441 finish_command(&child) != 0) {
3442 if (temp.name == temp.tmp_path)
3443 unlink(temp.name);
3444 error("error running textconv command '%s'", pgm);
3445 return NULL;
3446 }
3447 if (temp.name == temp.tmp_path)
3448 unlink(temp.name);
3450 return strbuf_detach(&buf, outsize);
3451 }