f91f256c56e5e4be0b3f162695e1d35e63124569
[git/git.git] / diff.c
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
15 #ifdef NO_FAST_WORKING_DIRECTORY
16 #define FAST_WORKING_DIRECTORY 0
17 #else
18 #define FAST_WORKING_DIRECTORY 1
19 #endif
20
21 static int diff_detect_rename_default;
22 static int diff_rename_limit_default = 200;
23 int diff_use_color_default = -1;
24 static const char *external_diff_cmd_cfg;
25 int diff_auto_refresh_index = 1;
26
27 static char diff_colors[][COLOR_MAXLEN] = {
28 "\033[m", /* reset */
29 "", /* PLAIN (normal) */
30 "\033[1m", /* METAINFO (bold) */
31 "\033[36m", /* FRAGINFO (cyan) */
32 "\033[31m", /* OLD (red) */
33 "\033[32m", /* NEW (green) */
34 "\033[33m", /* COMMIT (yellow) */
35 "\033[41m", /* WHITESPACE (red background) */
36 };
37
38 static int parse_diff_color_slot(const char *var, int ofs)
39 {
40 if (!strcasecmp(var+ofs, "plain"))
41 return DIFF_PLAIN;
42 if (!strcasecmp(var+ofs, "meta"))
43 return DIFF_METAINFO;
44 if (!strcasecmp(var+ofs, "frag"))
45 return DIFF_FRAGINFO;
46 if (!strcasecmp(var+ofs, "old"))
47 return DIFF_FILE_OLD;
48 if (!strcasecmp(var+ofs, "new"))
49 return DIFF_FILE_NEW;
50 if (!strcasecmp(var+ofs, "commit"))
51 return DIFF_COMMIT;
52 if (!strcasecmp(var+ofs, "whitespace"))
53 return DIFF_WHITESPACE;
54 die("bad config variable '%s'", var);
55 }
56
57 static struct ll_diff_driver {
58 const char *name;
59 struct ll_diff_driver *next;
60 const char *cmd;
61 } *user_diff, **user_diff_tail;
62
63 /*
64 * Currently there is only "diff.<drivername>.command" variable;
65 * because there are "diff.color.<slot>" variables, we are parsing
66 * this in a bit convoluted way to allow low level diff driver
67 * called "color".
68 */
69 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
70 {
71 const char *name;
72 int namelen;
73 struct ll_diff_driver *drv;
74
75 name = var + 5;
76 namelen = ep - name;
77 for (drv = user_diff; drv; drv = drv->next)
78 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
79 break;
80 if (!drv) {
81 drv = xcalloc(1, sizeof(struct ll_diff_driver));
82 drv->name = xmemdupz(name, namelen);
83 if (!user_diff_tail)
84 user_diff_tail = &user_diff;
85 *user_diff_tail = drv;
86 user_diff_tail = &(drv->next);
87 }
88
89 return git_config_string(&(drv->cmd), var, value);
90 }
91
92 /*
93 * 'diff.<what>.funcname' attribute can be specified in the configuration
94 * to define a customized regexp to find the beginning of a function to
95 * be used for hunk header lines of "diff -p" style output.
96 */
97 struct funcname_pattern_entry {
98 char *name;
99 char *pattern;
100 int cflags;
101 };
102 static struct funcname_pattern_list {
103 struct funcname_pattern_list *next;
104 struct funcname_pattern_entry e;
105 } *funcname_pattern_list;
106
107 static int parse_funcname_pattern(const char *var, const char *ep, const char *value, int cflags)
108 {
109 const char *name;
110 int namelen;
111 struct funcname_pattern_list *pp;
112
113 name = var + 5; /* "diff." */
114 namelen = ep - name;
115
116 for (pp = funcname_pattern_list; pp; pp = pp->next)
117 if (!strncmp(pp->e.name, name, namelen) && !pp->e.name[namelen])
118 break;
119 if (!pp) {
120 pp = xcalloc(1, sizeof(*pp));
121 pp->e.name = xmemdupz(name, namelen);
122 pp->next = funcname_pattern_list;
123 funcname_pattern_list = pp;
124 }
125 free(pp->e.pattern);
126 pp->e.pattern = xstrdup(value);
127 pp->e.cflags = cflags;
128 return 0;
129 }
130
131 /*
132 * These are to give UI layer defaults.
133 * The core-level commands such as git-diff-files should
134 * never be affected by the setting of diff.renames
135 * the user happens to have in the configuration file.
136 */
137 int git_diff_ui_config(const char *var, const char *value, void *cb)
138 {
139 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
140 diff_use_color_default = git_config_colorbool(var, value, -1);
141 return 0;
142 }
143 if (!strcmp(var, "diff.renames")) {
144 if (!value)
145 diff_detect_rename_default = DIFF_DETECT_RENAME;
146 else if (!strcasecmp(value, "copies") ||
147 !strcasecmp(value, "copy"))
148 diff_detect_rename_default = DIFF_DETECT_COPY;
149 else if (git_config_bool(var,value))
150 diff_detect_rename_default = DIFF_DETECT_RENAME;
151 return 0;
152 }
153 if (!strcmp(var, "diff.autorefreshindex")) {
154 diff_auto_refresh_index = git_config_bool(var, value);
155 return 0;
156 }
157 if (!strcmp(var, "diff.external"))
158 return git_config_string(&external_diff_cmd_cfg, var, value);
159 if (!prefixcmp(var, "diff.")) {
160 const char *ep = strrchr(var, '.');
161
162 if (ep != var + 4 && !strcmp(ep, ".command"))
163 return parse_lldiff_command(var, ep, value);
164 }
165
166 return git_diff_basic_config(var, value, cb);
167 }
168
169 int git_diff_basic_config(const char *var, const char *value, void *cb)
170 {
171 if (!strcmp(var, "diff.renamelimit")) {
172 diff_rename_limit_default = git_config_int(var, value);
173 return 0;
174 }
175
176 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
177 int slot = parse_diff_color_slot(var, 11);
178 if (!value)
179 return config_error_nonbool(var);
180 color_parse(value, var, diff_colors[slot]);
181 return 0;
182 }
183
184 if (!prefixcmp(var, "diff.")) {
185 const char *ep = strrchr(var, '.');
186 if (ep != var + 4) {
187 if (!strcmp(ep, ".funcname")) {
188 if (!value)
189 return config_error_nonbool(var);
190 return parse_funcname_pattern(var, ep, value,
191 0);
192 } else if (!strcmp(ep, ".xfuncname")) {
193 if (!value)
194 return config_error_nonbool(var);
195 return parse_funcname_pattern(var, ep, value,
196 REG_EXTENDED);
197 }
198 }
199 }
200
201 return git_color_default_config(var, value, cb);
202 }
203
204 static char *quote_two(const char *one, const char *two)
205 {
206 int need_one = quote_c_style(one, NULL, NULL, 1);
207 int need_two = quote_c_style(two, NULL, NULL, 1);
208 struct strbuf res;
209
210 strbuf_init(&res, 0);
211 if (need_one + need_two) {
212 strbuf_addch(&res, '"');
213 quote_c_style(one, &res, NULL, 1);
214 quote_c_style(two, &res, NULL, 1);
215 strbuf_addch(&res, '"');
216 } else {
217 strbuf_addstr(&res, one);
218 strbuf_addstr(&res, two);
219 }
220 return strbuf_detach(&res, NULL);
221 }
222
223 static const char *external_diff(void)
224 {
225 static const char *external_diff_cmd = NULL;
226 static int done_preparing = 0;
227
228 if (done_preparing)
229 return external_diff_cmd;
230 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
231 if (!external_diff_cmd)
232 external_diff_cmd = external_diff_cmd_cfg;
233 done_preparing = 1;
234 return external_diff_cmd;
235 }
236
237 static struct diff_tempfile {
238 const char *name; /* filename external diff should read from */
239 char hex[41];
240 char mode[10];
241 char tmp_path[PATH_MAX];
242 } diff_temp[2];
243
244 static int count_lines(const char *data, int size)
245 {
246 int count, ch, completely_empty = 1, nl_just_seen = 0;
247 count = 0;
248 while (0 < size--) {
249 ch = *data++;
250 if (ch == '\n') {
251 count++;
252 nl_just_seen = 1;
253 completely_empty = 0;
254 }
255 else {
256 nl_just_seen = 0;
257 completely_empty = 0;
258 }
259 }
260 if (completely_empty)
261 return 0;
262 if (!nl_just_seen)
263 count++; /* no trailing newline */
264 return count;
265 }
266
267 static void print_line_count(FILE *file, int count)
268 {
269 switch (count) {
270 case 0:
271 fprintf(file, "0,0");
272 break;
273 case 1:
274 fprintf(file, "1");
275 break;
276 default:
277 fprintf(file, "1,%d", count);
278 break;
279 }
280 }
281
282 static void copy_file_with_prefix(FILE *file,
283 int prefix, const char *data, int size,
284 const char *set, const char *reset)
285 {
286 int ch, nl_just_seen = 1;
287 while (0 < size--) {
288 ch = *data++;
289 if (nl_just_seen) {
290 fputs(set, file);
291 putc(prefix, file);
292 }
293 if (ch == '\n') {
294 nl_just_seen = 1;
295 fputs(reset, file);
296 } else
297 nl_just_seen = 0;
298 putc(ch, file);
299 }
300 if (!nl_just_seen)
301 fprintf(file, "%s\n\\ No newline at end of file\n", reset);
302 }
303
304 static void emit_rewrite_diff(const char *name_a,
305 const char *name_b,
306 struct diff_filespec *one,
307 struct diff_filespec *two,
308 struct diff_options *o)
309 {
310 int lc_a, lc_b;
311 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
312 const char *name_a_tab, *name_b_tab;
313 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
314 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
315 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
316 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
317 const char *reset = diff_get_color(color_diff, DIFF_RESET);
318 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
319
320 name_a += (*name_a == '/');
321 name_b += (*name_b == '/');
322 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
323 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
324
325 strbuf_reset(&a_name);
326 strbuf_reset(&b_name);
327 quote_two_c_style(&a_name, o->a_prefix, name_a, 0);
328 quote_two_c_style(&b_name, o->b_prefix, name_b, 0);
329
330 diff_populate_filespec(one, 0);
331 diff_populate_filespec(two, 0);
332 lc_a = count_lines(one->data, one->size);
333 lc_b = count_lines(two->data, two->size);
334 fprintf(o->file,
335 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
336 metainfo, a_name.buf, name_a_tab, reset,
337 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
338 print_line_count(o->file, lc_a);
339 fprintf(o->file, " +");
340 print_line_count(o->file, lc_b);
341 fprintf(o->file, " @@%s\n", reset);
342 if (lc_a)
343 copy_file_with_prefix(o->file, '-', one->data, one->size, old, reset);
344 if (lc_b)
345 copy_file_with_prefix(o->file, '+', two->data, two->size, new, reset);
346 }
347
348 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
349 {
350 if (!DIFF_FILE_VALID(one)) {
351 mf->ptr = (char *)""; /* does not matter */
352 mf->size = 0;
353 return 0;
354 }
355 else if (diff_populate_filespec(one, 0))
356 return -1;
357 mf->ptr = one->data;
358 mf->size = one->size;
359 return 0;
360 }
361
362 struct diff_words_buffer {
363 mmfile_t text;
364 long alloc;
365 long current; /* output pointer */
366 int suppressed_newline;
367 };
368
369 static void diff_words_append(char *line, unsigned long len,
370 struct diff_words_buffer *buffer)
371 {
372 if (buffer->text.size + len > buffer->alloc) {
373 buffer->alloc = (buffer->text.size + len) * 3 / 2;
374 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
375 }
376 line++;
377 len--;
378 memcpy(buffer->text.ptr + buffer->text.size, line, len);
379 buffer->text.size += len;
380 }
381
382 struct diff_words_data {
383 struct xdiff_emit_state xm;
384 struct diff_words_buffer minus, plus;
385 FILE *file;
386 };
387
388 static void print_word(FILE *file, struct diff_words_buffer *buffer, int len, int color,
389 int suppress_newline)
390 {
391 const char *ptr;
392 int eol = 0;
393
394 if (len == 0)
395 return;
396
397 ptr = buffer->text.ptr + buffer->current;
398 buffer->current += len;
399
400 if (ptr[len - 1] == '\n') {
401 eol = 1;
402 len--;
403 }
404
405 fputs(diff_get_color(1, color), file);
406 fwrite(ptr, len, 1, file);
407 fputs(diff_get_color(1, DIFF_RESET), file);
408
409 if (eol) {
410 if (suppress_newline)
411 buffer->suppressed_newline = 1;
412 else
413 putc('\n', file);
414 }
415 }
416
417 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
418 {
419 struct diff_words_data *diff_words = priv;
420
421 if (diff_words->minus.suppressed_newline) {
422 if (line[0] != '+')
423 putc('\n', diff_words->file);
424 diff_words->minus.suppressed_newline = 0;
425 }
426
427 len--;
428 switch (line[0]) {
429 case '-':
430 print_word(diff_words->file,
431 &diff_words->minus, len, DIFF_FILE_OLD, 1);
432 break;
433 case '+':
434 print_word(diff_words->file,
435 &diff_words->plus, len, DIFF_FILE_NEW, 0);
436 break;
437 case ' ':
438 print_word(diff_words->file,
439 &diff_words->plus, len, DIFF_PLAIN, 0);
440 diff_words->minus.current += len;
441 break;
442 }
443 }
444
445 /* this executes the word diff on the accumulated buffers */
446 static void diff_words_show(struct diff_words_data *diff_words)
447 {
448 xpparam_t xpp;
449 xdemitconf_t xecfg;
450 xdemitcb_t ecb;
451 mmfile_t minus, plus;
452 int i;
453
454 memset(&xecfg, 0, sizeof(xecfg));
455 minus.size = diff_words->minus.text.size;
456 minus.ptr = xmalloc(minus.size);
457 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
458 for (i = 0; i < minus.size; i++)
459 if (isspace(minus.ptr[i]))
460 minus.ptr[i] = '\n';
461 diff_words->minus.current = 0;
462
463 plus.size = diff_words->plus.text.size;
464 plus.ptr = xmalloc(plus.size);
465 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
466 for (i = 0; i < plus.size; i++)
467 if (isspace(plus.ptr[i]))
468 plus.ptr[i] = '\n';
469 diff_words->plus.current = 0;
470
471 xpp.flags = XDF_NEED_MINIMAL;
472 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
473 ecb.outf = xdiff_outf;
474 ecb.priv = diff_words;
475 diff_words->xm.consume = fn_out_diff_words_aux;
476 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
477
478 free(minus.ptr);
479 free(plus.ptr);
480 diff_words->minus.text.size = diff_words->plus.text.size = 0;
481
482 if (diff_words->minus.suppressed_newline) {
483 putc('\n', diff_words->file);
484 diff_words->minus.suppressed_newline = 0;
485 }
486 }
487
488 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
489
490 struct emit_callback {
491 struct xdiff_emit_state xm;
492 int nparents, color_diff;
493 unsigned ws_rule;
494 sane_truncate_fn truncate;
495 const char **label_path;
496 struct diff_words_data *diff_words;
497 int *found_changesp;
498 FILE *file;
499 };
500
501 static void free_diff_words_data(struct emit_callback *ecbdata)
502 {
503 if (ecbdata->diff_words) {
504 /* flush buffers */
505 if (ecbdata->diff_words->minus.text.size ||
506 ecbdata->diff_words->plus.text.size)
507 diff_words_show(ecbdata->diff_words);
508
509 free (ecbdata->diff_words->minus.text.ptr);
510 free (ecbdata->diff_words->plus.text.ptr);
511 free(ecbdata->diff_words);
512 ecbdata->diff_words = NULL;
513 }
514 }
515
516 const char *diff_get_color(int diff_use_color, enum color_diff ix)
517 {
518 if (diff_use_color)
519 return diff_colors[ix];
520 return "";
521 }
522
523 static void emit_line(FILE *file, const char *set, const char *reset, const char *line, int len)
524 {
525 int has_trailing_newline, has_trailing_carriage_return;
526
527 has_trailing_newline = (len > 0 && line[len-1] == '\n');
528 if (has_trailing_newline)
529 len--;
530 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
531 if (has_trailing_carriage_return)
532 len--;
533
534 fputs(set, file);
535 fwrite(line, len, 1, file);
536 fputs(reset, file);
537 if (has_trailing_carriage_return)
538 fputc('\r', file);
539 if (has_trailing_newline)
540 fputc('\n', file);
541 }
542
543 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
544 {
545 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
546 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
547
548 if (!*ws)
549 emit_line(ecbdata->file, set, reset, line, len);
550 else {
551 /* Emit just the prefix, then the rest. */
552 emit_line(ecbdata->file, set, reset, line, ecbdata->nparents);
553 ws_check_emit(line + ecbdata->nparents,
554 len - ecbdata->nparents, ecbdata->ws_rule,
555 ecbdata->file, set, reset, ws);
556 }
557 }
558
559 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
560 {
561 const char *cp;
562 unsigned long allot;
563 size_t l = len;
564
565 if (ecb->truncate)
566 return ecb->truncate(line, len);
567 cp = line;
568 allot = l;
569 while (0 < l) {
570 (void) utf8_width(&cp, &l);
571 if (!cp)
572 break; /* truncated in the middle? */
573 }
574 return allot - l;
575 }
576
577 static void fn_out_consume(void *priv, char *line, unsigned long len)
578 {
579 int i;
580 int color;
581 struct emit_callback *ecbdata = priv;
582 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
583 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
584 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
585
586 *(ecbdata->found_changesp) = 1;
587
588 if (ecbdata->label_path[0]) {
589 const char *name_a_tab, *name_b_tab;
590
591 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
592 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
593
594 fprintf(ecbdata->file, "%s--- %s%s%s\n",
595 meta, ecbdata->label_path[0], reset, name_a_tab);
596 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
597 meta, ecbdata->label_path[1], reset, name_b_tab);
598 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
599 }
600
601 /* This is not really necessary for now because
602 * this codepath only deals with two-way diffs.
603 */
604 for (i = 0; i < len && line[i] == '@'; i++)
605 ;
606 if (2 <= i && i < len && line[i] == ' ') {
607 ecbdata->nparents = i - 1;
608 len = sane_truncate_line(ecbdata, line, len);
609 emit_line(ecbdata->file,
610 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
611 reset, line, len);
612 if (line[len-1] != '\n')
613 putc('\n', ecbdata->file);
614 return;
615 }
616
617 if (len < ecbdata->nparents) {
618 emit_line(ecbdata->file, reset, reset, line, len);
619 return;
620 }
621
622 color = DIFF_PLAIN;
623 if (ecbdata->diff_words && ecbdata->nparents != 1)
624 /* fall back to normal diff */
625 free_diff_words_data(ecbdata);
626 if (ecbdata->diff_words) {
627 if (line[0] == '-') {
628 diff_words_append(line, len,
629 &ecbdata->diff_words->minus);
630 return;
631 } else if (line[0] == '+') {
632 diff_words_append(line, len,
633 &ecbdata->diff_words->plus);
634 return;
635 }
636 if (ecbdata->diff_words->minus.text.size ||
637 ecbdata->diff_words->plus.text.size)
638 diff_words_show(ecbdata->diff_words);
639 line++;
640 len--;
641 emit_line(ecbdata->file, plain, reset, line, len);
642 return;
643 }
644 for (i = 0; i < ecbdata->nparents && len; i++) {
645 if (line[i] == '-')
646 color = DIFF_FILE_OLD;
647 else if (line[i] == '+')
648 color = DIFF_FILE_NEW;
649 }
650
651 if (color != DIFF_FILE_NEW) {
652 emit_line(ecbdata->file,
653 diff_get_color(ecbdata->color_diff, color),
654 reset, line, len);
655 return;
656 }
657 emit_add_line(reset, ecbdata, line, len);
658 }
659
660 static char *pprint_rename(const char *a, const char *b)
661 {
662 const char *old = a;
663 const char *new = b;
664 struct strbuf name;
665 int pfx_length, sfx_length;
666 int len_a = strlen(a);
667 int len_b = strlen(b);
668 int a_midlen, b_midlen;
669 int qlen_a = quote_c_style(a, NULL, NULL, 0);
670 int qlen_b = quote_c_style(b, NULL, NULL, 0);
671
672 strbuf_init(&name, 0);
673 if (qlen_a || qlen_b) {
674 quote_c_style(a, &name, NULL, 0);
675 strbuf_addstr(&name, " => ");
676 quote_c_style(b, &name, NULL, 0);
677 return strbuf_detach(&name, NULL);
678 }
679
680 /* Find common prefix */
681 pfx_length = 0;
682 while (*old && *new && *old == *new) {
683 if (*old == '/')
684 pfx_length = old - a + 1;
685 old++;
686 new++;
687 }
688
689 /* Find common suffix */
690 old = a + len_a;
691 new = b + len_b;
692 sfx_length = 0;
693 while (a <= old && b <= new && *old == *new) {
694 if (*old == '/')
695 sfx_length = len_a - (old - a);
696 old--;
697 new--;
698 }
699
700 /*
701 * pfx{mid-a => mid-b}sfx
702 * {pfx-a => pfx-b}sfx
703 * pfx{sfx-a => sfx-b}
704 * name-a => name-b
705 */
706 a_midlen = len_a - pfx_length - sfx_length;
707 b_midlen = len_b - pfx_length - sfx_length;
708 if (a_midlen < 0)
709 a_midlen = 0;
710 if (b_midlen < 0)
711 b_midlen = 0;
712
713 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
714 if (pfx_length + sfx_length) {
715 strbuf_add(&name, a, pfx_length);
716 strbuf_addch(&name, '{');
717 }
718 strbuf_add(&name, a + pfx_length, a_midlen);
719 strbuf_addstr(&name, " => ");
720 strbuf_add(&name, b + pfx_length, b_midlen);
721 if (pfx_length + sfx_length) {
722 strbuf_addch(&name, '}');
723 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
724 }
725 return strbuf_detach(&name, NULL);
726 }
727
728 struct diffstat_t {
729 struct xdiff_emit_state xm;
730
731 int nr;
732 int alloc;
733 struct diffstat_file {
734 char *from_name;
735 char *name;
736 char *print_name;
737 unsigned is_unmerged:1;
738 unsigned is_binary:1;
739 unsigned is_renamed:1;
740 unsigned int added, deleted;
741 } **files;
742 };
743
744 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
745 const char *name_a,
746 const char *name_b)
747 {
748 struct diffstat_file *x;
749 x = xcalloc(sizeof (*x), 1);
750 if (diffstat->nr == diffstat->alloc) {
751 diffstat->alloc = alloc_nr(diffstat->alloc);
752 diffstat->files = xrealloc(diffstat->files,
753 diffstat->alloc * sizeof(x));
754 }
755 diffstat->files[diffstat->nr++] = x;
756 if (name_b) {
757 x->from_name = xstrdup(name_a);
758 x->name = xstrdup(name_b);
759 x->is_renamed = 1;
760 }
761 else {
762 x->from_name = NULL;
763 x->name = xstrdup(name_a);
764 }
765 return x;
766 }
767
768 static void diffstat_consume(void *priv, char *line, unsigned long len)
769 {
770 struct diffstat_t *diffstat = priv;
771 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
772
773 if (line[0] == '+')
774 x->added++;
775 else if (line[0] == '-')
776 x->deleted++;
777 }
778
779 const char mime_boundary_leader[] = "------------";
780
781 static int scale_linear(int it, int width, int max_change)
782 {
783 /*
784 * make sure that at least one '-' is printed if there were deletions,
785 * and likewise for '+'.
786 */
787 if (max_change < 2)
788 return it;
789 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
790 }
791
792 static void show_name(FILE *file,
793 const char *prefix, const char *name, int len,
794 const char *reset, const char *set)
795 {
796 fprintf(file, " %s%s%-*s%s |", set, prefix, len, name, reset);
797 }
798
799 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
800 {
801 if (cnt <= 0)
802 return;
803 fprintf(file, "%s", set);
804 while (cnt--)
805 putc(ch, file);
806 fprintf(file, "%s", reset);
807 }
808
809 static void fill_print_name(struct diffstat_file *file)
810 {
811 char *pname;
812
813 if (file->print_name)
814 return;
815
816 if (!file->is_renamed) {
817 struct strbuf buf;
818 strbuf_init(&buf, 0);
819 if (quote_c_style(file->name, &buf, NULL, 0)) {
820 pname = strbuf_detach(&buf, NULL);
821 } else {
822 pname = file->name;
823 strbuf_release(&buf);
824 }
825 } else {
826 pname = pprint_rename(file->from_name, file->name);
827 }
828 file->print_name = pname;
829 }
830
831 static void show_stats(struct diffstat_t* data, struct diff_options *options)
832 {
833 int i, len, add, del, total, adds = 0, dels = 0;
834 int max_change = 0, max_len = 0;
835 int total_files = data->nr;
836 int width, name_width;
837 const char *reset, *set, *add_c, *del_c;
838
839 if (data->nr == 0)
840 return;
841
842 width = options->stat_width ? options->stat_width : 80;
843 name_width = options->stat_name_width ? options->stat_name_width : 50;
844
845 /* Sanity: give at least 5 columns to the graph,
846 * but leave at least 10 columns for the name.
847 */
848 if (width < 25)
849 width = 25;
850 if (name_width < 10)
851 name_width = 10;
852 else if (width < name_width + 15)
853 name_width = width - 15;
854
855 /* Find the longest filename and max number of changes */
856 reset = diff_get_color_opt(options, DIFF_RESET);
857 set = diff_get_color_opt(options, DIFF_PLAIN);
858 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
859 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
860
861 for (i = 0; i < data->nr; i++) {
862 struct diffstat_file *file = data->files[i];
863 int change = file->added + file->deleted;
864 fill_print_name(file);
865 len = strlen(file->print_name);
866 if (max_len < len)
867 max_len = len;
868
869 if (file->is_binary || file->is_unmerged)
870 continue;
871 if (max_change < change)
872 max_change = change;
873 }
874
875 /* Compute the width of the graph part;
876 * 10 is for one blank at the beginning of the line plus
877 * " | count " between the name and the graph.
878 *
879 * From here on, name_width is the width of the name area,
880 * and width is the width of the graph area.
881 */
882 name_width = (name_width < max_len) ? name_width : max_len;
883 if (width < (name_width + 10) + max_change)
884 width = width - (name_width + 10);
885 else
886 width = max_change;
887
888 for (i = 0; i < data->nr; i++) {
889 const char *prefix = "";
890 char *name = data->files[i]->print_name;
891 int added = data->files[i]->added;
892 int deleted = data->files[i]->deleted;
893 int name_len;
894
895 /*
896 * "scale" the filename
897 */
898 len = name_width;
899 name_len = strlen(name);
900 if (name_width < name_len) {
901 char *slash;
902 prefix = "...";
903 len -= 3;
904 name += name_len - len;
905 slash = strchr(name, '/');
906 if (slash)
907 name = slash;
908 }
909
910 if (data->files[i]->is_binary) {
911 show_name(options->file, prefix, name, len, reset, set);
912 fprintf(options->file, " Bin ");
913 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
914 fprintf(options->file, " -> ");
915 fprintf(options->file, "%s%d%s", add_c, added, reset);
916 fprintf(options->file, " bytes");
917 fprintf(options->file, "\n");
918 continue;
919 }
920 else if (data->files[i]->is_unmerged) {
921 show_name(options->file, prefix, name, len, reset, set);
922 fprintf(options->file, " Unmerged\n");
923 continue;
924 }
925 else if (!data->files[i]->is_renamed &&
926 (added + deleted == 0)) {
927 total_files--;
928 continue;
929 }
930
931 /*
932 * scale the add/delete
933 */
934 add = added;
935 del = deleted;
936 total = add + del;
937 adds += add;
938 dels += del;
939
940 if (width <= max_change) {
941 add = scale_linear(add, width, max_change);
942 del = scale_linear(del, width, max_change);
943 total = add + del;
944 }
945 show_name(options->file, prefix, name, len, reset, set);
946 fprintf(options->file, "%5d%s", added + deleted,
947 added + deleted ? " " : "");
948 show_graph(options->file, '+', add, add_c, reset);
949 show_graph(options->file, '-', del, del_c, reset);
950 fprintf(options->file, "\n");
951 }
952 fprintf(options->file,
953 "%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
954 set, total_files, adds, dels, reset);
955 }
956
957 static void show_shortstats(struct diffstat_t* data, struct diff_options *options)
958 {
959 int i, adds = 0, dels = 0, total_files = data->nr;
960
961 if (data->nr == 0)
962 return;
963
964 for (i = 0; i < data->nr; i++) {
965 if (!data->files[i]->is_binary &&
966 !data->files[i]->is_unmerged) {
967 int added = data->files[i]->added;
968 int deleted= data->files[i]->deleted;
969 if (!data->files[i]->is_renamed &&
970 (added + deleted == 0)) {
971 total_files--;
972 } else {
973 adds += added;
974 dels += deleted;
975 }
976 }
977 }
978 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
979 total_files, adds, dels);
980 }
981
982 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
983 {
984 int i;
985
986 if (data->nr == 0)
987 return;
988
989 for (i = 0; i < data->nr; i++) {
990 struct diffstat_file *file = data->files[i];
991
992 if (file->is_binary)
993 fprintf(options->file, "-\t-\t");
994 else
995 fprintf(options->file,
996 "%d\t%d\t", file->added, file->deleted);
997 if (options->line_termination) {
998 fill_print_name(file);
999 if (!file->is_renamed)
1000 write_name_quoted(file->name, options->file,
1001 options->line_termination);
1002 else {
1003 fputs(file->print_name, options->file);
1004 putc(options->line_termination, options->file);
1005 }
1006 } else {
1007 if (file->is_renamed) {
1008 putc('\0', options->file);
1009 write_name_quoted(file->from_name, options->file, '\0');
1010 }
1011 write_name_quoted(file->name, options->file, '\0');
1012 }
1013 }
1014 }
1015
1016 struct dirstat_file {
1017 const char *name;
1018 unsigned long changed;
1019 };
1020
1021 struct dirstat_dir {
1022 struct dirstat_file *files;
1023 int alloc, nr, percent, cumulative;
1024 };
1025
1026 static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
1027 {
1028 unsigned long this_dir = 0;
1029 unsigned int sources = 0;
1030
1031 while (dir->nr) {
1032 struct dirstat_file *f = dir->files;
1033 int namelen = strlen(f->name);
1034 unsigned long this;
1035 char *slash;
1036
1037 if (namelen < baselen)
1038 break;
1039 if (memcmp(f->name, base, baselen))
1040 break;
1041 slash = strchr(f->name + baselen, '/');
1042 if (slash) {
1043 int newbaselen = slash + 1 - f->name;
1044 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
1045 sources++;
1046 } else {
1047 this = f->changed;
1048 dir->files++;
1049 dir->nr--;
1050 sources += 2;
1051 }
1052 this_dir += this;
1053 }
1054
1055 /*
1056 * We don't report dirstat's for
1057 * - the top level
1058 * - or cases where everything came from a single directory
1059 * under this directory (sources == 1).
1060 */
1061 if (baselen && sources != 1) {
1062 int permille = this_dir * 1000 / changed;
1063 if (permille) {
1064 int percent = permille / 10;
1065 if (percent >= dir->percent) {
1066 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1067 if (!dir->cumulative)
1068 return 0;
1069 }
1070 }
1071 }
1072 return this_dir;
1073 }
1074
1075 static int dirstat_compare(const void *_a, const void *_b)
1076 {
1077 const struct dirstat_file *a = _a;
1078 const struct dirstat_file *b = _b;
1079 return strcmp(a->name, b->name);
1080 }
1081
1082 static void show_dirstat(struct diff_options *options)
1083 {
1084 int i;
1085 unsigned long changed;
1086 struct dirstat_dir dir;
1087 struct diff_queue_struct *q = &diff_queued_diff;
1088
1089 dir.files = NULL;
1090 dir.alloc = 0;
1091 dir.nr = 0;
1092 dir.percent = options->dirstat_percent;
1093 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1094
1095 changed = 0;
1096 for (i = 0; i < q->nr; i++) {
1097 struct diff_filepair *p = q->queue[i];
1098 const char *name;
1099 unsigned long copied, added, damage;
1100
1101 name = p->one->path ? p->one->path : p->two->path;
1102
1103 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1104 diff_populate_filespec(p->one, 0);
1105 diff_populate_filespec(p->two, 0);
1106 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1107 &copied, &added);
1108 diff_free_filespec_data(p->one);
1109 diff_free_filespec_data(p->two);
1110 } else if (DIFF_FILE_VALID(p->one)) {
1111 diff_populate_filespec(p->one, 1);
1112 copied = added = 0;
1113 diff_free_filespec_data(p->one);
1114 } else if (DIFF_FILE_VALID(p->two)) {
1115 diff_populate_filespec(p->two, 1);
1116 copied = 0;
1117 added = p->two->size;
1118 diff_free_filespec_data(p->two);
1119 } else
1120 continue;
1121
1122 /*
1123 * Original minus copied is the removed material,
1124 * added is the new material. They are both damages
1125 * made to the preimage.
1126 */
1127 damage = (p->one->size - copied) + added;
1128
1129 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1130 dir.files[dir.nr].name = name;
1131 dir.files[dir.nr].changed = damage;
1132 changed += damage;
1133 dir.nr++;
1134 }
1135
1136 /* This can happen even with many files, if everything was renames */
1137 if (!changed)
1138 return;
1139
1140 /* Show all directories with more than x% of the changes */
1141 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1142 gather_dirstat(options->file, &dir, changed, "", 0);
1143 }
1144
1145 static void free_diffstat_info(struct diffstat_t *diffstat)
1146 {
1147 int i;
1148 for (i = 0; i < diffstat->nr; i++) {
1149 struct diffstat_file *f = diffstat->files[i];
1150 if (f->name != f->print_name)
1151 free(f->print_name);
1152 free(f->name);
1153 free(f->from_name);
1154 free(f);
1155 }
1156 free(diffstat->files);
1157 }
1158
1159 struct checkdiff_t {
1160 struct xdiff_emit_state xm;
1161 const char *filename;
1162 int lineno;
1163 struct diff_options *o;
1164 unsigned ws_rule;
1165 unsigned status;
1166 int trailing_blanks_start;
1167 };
1168
1169 static int is_conflict_marker(const char *line, unsigned long len)
1170 {
1171 char firstchar;
1172 int cnt;
1173
1174 if (len < 8)
1175 return 0;
1176 firstchar = line[0];
1177 switch (firstchar) {
1178 case '=': case '>': case '<':
1179 break;
1180 default:
1181 return 0;
1182 }
1183 for (cnt = 1; cnt < 7; cnt++)
1184 if (line[cnt] != firstchar)
1185 return 0;
1186 /* line[0] thru line[6] are same as firstchar */
1187 if (firstchar == '=') {
1188 /* divider between ours and theirs? */
1189 if (len != 8 || line[7] != '\n')
1190 return 0;
1191 } else if (len < 8 || !isspace(line[7])) {
1192 /* not divider before ours nor after theirs */
1193 return 0;
1194 }
1195 return 1;
1196 }
1197
1198 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1199 {
1200 struct checkdiff_t *data = priv;
1201 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1202 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1203 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1204 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1205 char *err;
1206
1207 if (line[0] == '+') {
1208 unsigned bad;
1209 data->lineno++;
1210 if (!ws_blank_line(line + 1, len - 1, data->ws_rule))
1211 data->trailing_blanks_start = 0;
1212 else if (!data->trailing_blanks_start)
1213 data->trailing_blanks_start = data->lineno;
1214 if (is_conflict_marker(line + 1, len - 1)) {
1215 data->status |= 1;
1216 fprintf(data->o->file,
1217 "%s:%d: leftover conflict marker\n",
1218 data->filename, data->lineno);
1219 }
1220 bad = ws_check(line + 1, len - 1, data->ws_rule);
1221 if (!bad)
1222 return;
1223 data->status |= bad;
1224 err = whitespace_error_string(bad);
1225 fprintf(data->o->file, "%s:%d: %s.\n",
1226 data->filename, data->lineno, err);
1227 free(err);
1228 emit_line(data->o->file, set, reset, line, 1);
1229 ws_check_emit(line + 1, len - 1, data->ws_rule,
1230 data->o->file, set, reset, ws);
1231 } else if (line[0] == ' ') {
1232 data->lineno++;
1233 data->trailing_blanks_start = 0;
1234 } else if (line[0] == '@') {
1235 char *plus = strchr(line, '+');
1236 if (plus)
1237 data->lineno = strtol(plus, NULL, 10) - 1;
1238 else
1239 die("invalid diff");
1240 data->trailing_blanks_start = 0;
1241 }
1242 }
1243
1244 static unsigned char *deflate_it(char *data,
1245 unsigned long size,
1246 unsigned long *result_size)
1247 {
1248 int bound;
1249 unsigned char *deflated;
1250 z_stream stream;
1251
1252 memset(&stream, 0, sizeof(stream));
1253 deflateInit(&stream, zlib_compression_level);
1254 bound = deflateBound(&stream, size);
1255 deflated = xmalloc(bound);
1256 stream.next_out = deflated;
1257 stream.avail_out = bound;
1258
1259 stream.next_in = (unsigned char *)data;
1260 stream.avail_in = size;
1261 while (deflate(&stream, Z_FINISH) == Z_OK)
1262 ; /* nothing */
1263 deflateEnd(&stream);
1264 *result_size = stream.total_out;
1265 return deflated;
1266 }
1267
1268 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
1269 {
1270 void *cp;
1271 void *delta;
1272 void *deflated;
1273 void *data;
1274 unsigned long orig_size;
1275 unsigned long delta_size;
1276 unsigned long deflate_size;
1277 unsigned long data_size;
1278
1279 /* We could do deflated delta, or we could do just deflated two,
1280 * whichever is smaller.
1281 */
1282 delta = NULL;
1283 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1284 if (one->size && two->size) {
1285 delta = diff_delta(one->ptr, one->size,
1286 two->ptr, two->size,
1287 &delta_size, deflate_size);
1288 if (delta) {
1289 void *to_free = delta;
1290 orig_size = delta_size;
1291 delta = deflate_it(delta, delta_size, &delta_size);
1292 free(to_free);
1293 }
1294 }
1295
1296 if (delta && delta_size < deflate_size) {
1297 fprintf(file, "delta %lu\n", orig_size);
1298 free(deflated);
1299 data = delta;
1300 data_size = delta_size;
1301 }
1302 else {
1303 fprintf(file, "literal %lu\n", two->size);
1304 free(delta);
1305 data = deflated;
1306 data_size = deflate_size;
1307 }
1308
1309 /* emit data encoded in base85 */
1310 cp = data;
1311 while (data_size) {
1312 int bytes = (52 < data_size) ? 52 : data_size;
1313 char line[70];
1314 data_size -= bytes;
1315 if (bytes <= 26)
1316 line[0] = bytes + 'A' - 1;
1317 else
1318 line[0] = bytes - 26 + 'a' - 1;
1319 encode_85(line + 1, cp, bytes);
1320 cp = (char *) cp + bytes;
1321 fputs(line, file);
1322 fputc('\n', file);
1323 }
1324 fprintf(file, "\n");
1325 free(data);
1326 }
1327
1328 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
1329 {
1330 fprintf(file, "GIT binary patch\n");
1331 emit_binary_diff_body(file, one, two);
1332 emit_binary_diff_body(file, two, one);
1333 }
1334
1335 static void setup_diff_attr_check(struct git_attr_check *check)
1336 {
1337 static struct git_attr *attr_diff;
1338
1339 if (!attr_diff) {
1340 attr_diff = git_attr("diff", 4);
1341 }
1342 check[0].attr = attr_diff;
1343 }
1344
1345 static void diff_filespec_check_attr(struct diff_filespec *one)
1346 {
1347 struct git_attr_check attr_diff_check;
1348 int check_from_data = 0;
1349
1350 if (one->checked_attr)
1351 return;
1352
1353 setup_diff_attr_check(&attr_diff_check);
1354 one->is_binary = 0;
1355 one->funcname_pattern_ident = NULL;
1356
1357 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1358 const char *value;
1359
1360 /* binaryness */
1361 value = attr_diff_check.value;
1362 if (ATTR_TRUE(value))
1363 ;
1364 else if (ATTR_FALSE(value))
1365 one->is_binary = 1;
1366 else
1367 check_from_data = 1;
1368
1369 /* funcname pattern ident */
1370 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1371 ;
1372 else
1373 one->funcname_pattern_ident = value;
1374 }
1375
1376 if (check_from_data) {
1377 if (!one->data && DIFF_FILE_VALID(one))
1378 diff_populate_filespec(one, 0);
1379
1380 if (one->data)
1381 one->is_binary = buffer_is_binary(one->data, one->size);
1382 }
1383 }
1384
1385 int diff_filespec_is_binary(struct diff_filespec *one)
1386 {
1387 diff_filespec_check_attr(one);
1388 return one->is_binary;
1389 }
1390
1391 static const struct funcname_pattern_entry *funcname_pattern(const char *ident)
1392 {
1393 struct funcname_pattern_list *pp;
1394
1395 for (pp = funcname_pattern_list; pp; pp = pp->next)
1396 if (!strcmp(ident, pp->e.name))
1397 return &pp->e;
1398 return NULL;
1399 }
1400
1401 static const struct funcname_pattern_entry builtin_funcname_pattern[] = {
1402 { "java",
1403 "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
1404 "^[ \t]*(([ \t]*[A-Za-z_][A-Za-z_0-9]*){2,}[ \t]*\\([^;]*)$",
1405 REG_EXTENDED },
1406 { "pascal",
1407 "^((procedure|function|constructor|destructor|interface|"
1408 "implementation|initialization|finalization)[ \t]*.*)$"
1409 "|"
1410 "^(.*=[ \t]*(class|record).*)$",
1411 REG_EXTENDED },
1412 { "bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
1413 REG_EXTENDED },
1414 { "tex",
1415 "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
1416 REG_EXTENDED },
1417 { "ruby", "^[ \t]*((class|module|def)[ \t].*)$",
1418 REG_EXTENDED },
1419 };
1420
1421 static const struct funcname_pattern_entry *diff_funcname_pattern(struct diff_filespec *one)
1422 {
1423 const char *ident;
1424 const struct funcname_pattern_entry *pe;
1425 int i;
1426
1427 diff_filespec_check_attr(one);
1428 ident = one->funcname_pattern_ident;
1429
1430 if (!ident)
1431 /*
1432 * If the config file has "funcname.default" defined, that
1433 * regexp is used; otherwise NULL is returned and xemit uses
1434 * the built-in default.
1435 */
1436 return funcname_pattern("default");
1437
1438 /* Look up custom "funcname.$ident" regexp from config. */
1439 pe = funcname_pattern(ident);
1440 if (pe)
1441 return pe;
1442
1443 /*
1444 * And define built-in fallback patterns here. Note that
1445 * these can be overridden by the user's config settings.
1446 */
1447 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1448 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1449 return &builtin_funcname_pattern[i];
1450
1451 return NULL;
1452 }
1453
1454 static void builtin_diff(const char *name_a,
1455 const char *name_b,
1456 struct diff_filespec *one,
1457 struct diff_filespec *two,
1458 const char *xfrm_msg,
1459 struct diff_options *o,
1460 int complete_rewrite)
1461 {
1462 mmfile_t mf1, mf2;
1463 const char *lbl[2];
1464 char *a_one, *b_two;
1465 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1466 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1467
1468 /* Never use a non-valid filename anywhere if at all possible */
1469 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1470 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1471
1472 a_one = quote_two(o->a_prefix, name_a + (*name_a == '/'));
1473 b_two = quote_two(o->b_prefix, name_b + (*name_b == '/'));
1474 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1475 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1476 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1477 if (lbl[0][0] == '/') {
1478 /* /dev/null */
1479 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
1480 if (xfrm_msg && xfrm_msg[0])
1481 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1482 }
1483 else if (lbl[1][0] == '/') {
1484 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1485 if (xfrm_msg && xfrm_msg[0])
1486 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1487 }
1488 else {
1489 if (one->mode != two->mode) {
1490 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1491 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
1492 }
1493 if (xfrm_msg && xfrm_msg[0])
1494 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1495 /*
1496 * we do not run diff between different kind
1497 * of objects.
1498 */
1499 if ((one->mode ^ two->mode) & S_IFMT)
1500 goto free_ab_and_return;
1501 if (complete_rewrite) {
1502 emit_rewrite_diff(name_a, name_b, one, two, o);
1503 o->found_changes = 1;
1504 goto free_ab_and_return;
1505 }
1506 }
1507
1508 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1509 die("unable to read files to diff");
1510
1511 if (!DIFF_OPT_TST(o, TEXT) &&
1512 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1513 /* Quite common confusing case */
1514 if (mf1.size == mf2.size &&
1515 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1516 goto free_ab_and_return;
1517 if (DIFF_OPT_TST(o, BINARY))
1518 emit_binary_diff(o->file, &mf1, &mf2);
1519 else
1520 fprintf(o->file, "Binary files %s and %s differ\n",
1521 lbl[0], lbl[1]);
1522 o->found_changes = 1;
1523 }
1524 else {
1525 /* Crazy xdl interfaces.. */
1526 const char *diffopts = getenv("GIT_DIFF_OPTS");
1527 xpparam_t xpp;
1528 xdemitconf_t xecfg;
1529 xdemitcb_t ecb;
1530 struct emit_callback ecbdata;
1531 const struct funcname_pattern_entry *pe;
1532
1533 pe = diff_funcname_pattern(one);
1534 if (!pe)
1535 pe = diff_funcname_pattern(two);
1536
1537 memset(&xecfg, 0, sizeof(xecfg));
1538 memset(&ecbdata, 0, sizeof(ecbdata));
1539 ecbdata.label_path = lbl;
1540 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1541 ecbdata.found_changesp = &o->found_changes;
1542 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1543 ecbdata.file = o->file;
1544 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1545 xecfg.ctxlen = o->context;
1546 xecfg.flags = XDL_EMIT_FUNCNAMES;
1547 if (pe)
1548 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1549 if (!diffopts)
1550 ;
1551 else if (!prefixcmp(diffopts, "--unified="))
1552 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1553 else if (!prefixcmp(diffopts, "-u"))
1554 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1555 ecb.outf = xdiff_outf;
1556 ecb.priv = &ecbdata;
1557 ecbdata.xm.consume = fn_out_consume;
1558 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1559 ecbdata.diff_words =
1560 xcalloc(1, sizeof(struct diff_words_data));
1561 ecbdata.diff_words->file = o->file;
1562 }
1563 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1564 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1565 free_diff_words_data(&ecbdata);
1566 }
1567
1568 free_ab_and_return:
1569 diff_free_filespec_data(one);
1570 diff_free_filespec_data(two);
1571 free(a_one);
1572 free(b_two);
1573 return;
1574 }
1575
1576 static void builtin_diffstat(const char *name_a, const char *name_b,
1577 struct diff_filespec *one,
1578 struct diff_filespec *two,
1579 struct diffstat_t *diffstat,
1580 struct diff_options *o,
1581 int complete_rewrite)
1582 {
1583 mmfile_t mf1, mf2;
1584 struct diffstat_file *data;
1585
1586 data = diffstat_add(diffstat, name_a, name_b);
1587
1588 if (!one || !two) {
1589 data->is_unmerged = 1;
1590 return;
1591 }
1592 if (complete_rewrite) {
1593 diff_populate_filespec(one, 0);
1594 diff_populate_filespec(two, 0);
1595 data->deleted = count_lines(one->data, one->size);
1596 data->added = count_lines(two->data, two->size);
1597 goto free_and_return;
1598 }
1599 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1600 die("unable to read files to diff");
1601
1602 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1603 data->is_binary = 1;
1604 data->added = mf2.size;
1605 data->deleted = mf1.size;
1606 } else {
1607 /* Crazy xdl interfaces.. */
1608 xpparam_t xpp;
1609 xdemitconf_t xecfg;
1610 xdemitcb_t ecb;
1611
1612 memset(&xecfg, 0, sizeof(xecfg));
1613 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1614 ecb.outf = xdiff_outf;
1615 ecb.priv = diffstat;
1616 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1617 }
1618
1619 free_and_return:
1620 diff_free_filespec_data(one);
1621 diff_free_filespec_data(two);
1622 }
1623
1624 static void builtin_checkdiff(const char *name_a, const char *name_b,
1625 const char *attr_path,
1626 struct diff_filespec *one,
1627 struct diff_filespec *two,
1628 struct diff_options *o)
1629 {
1630 mmfile_t mf1, mf2;
1631 struct checkdiff_t data;
1632
1633 if (!two)
1634 return;
1635
1636 memset(&data, 0, sizeof(data));
1637 data.xm.consume = checkdiff_consume;
1638 data.filename = name_b ? name_b : name_a;
1639 data.lineno = 0;
1640 data.o = o;
1641 data.ws_rule = whitespace_rule(attr_path);
1642
1643 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1644 die("unable to read files to diff");
1645
1646 /*
1647 * All the other codepaths check both sides, but not checking
1648 * the "old" side here is deliberate. We are checking the newly
1649 * introduced changes, and as long as the "new" side is text, we
1650 * can and should check what it introduces.
1651 */
1652 if (diff_filespec_is_binary(two))
1653 goto free_and_return;
1654 else {
1655 /* Crazy xdl interfaces.. */
1656 xpparam_t xpp;
1657 xdemitconf_t xecfg;
1658 xdemitcb_t ecb;
1659
1660 memset(&xecfg, 0, sizeof(xecfg));
1661 xecfg.ctxlen = 1; /* at least one context line */
1662 xpp.flags = XDF_NEED_MINIMAL;
1663 ecb.outf = xdiff_outf;
1664 ecb.priv = &data;
1665 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1666
1667 if ((data.ws_rule & WS_TRAILING_SPACE) &&
1668 data.trailing_blanks_start) {
1669 fprintf(o->file, "%s:%d: ends with blank lines.\n",
1670 data.filename, data.trailing_blanks_start);
1671 data.status = 1; /* report errors */
1672 }
1673 }
1674 free_and_return:
1675 diff_free_filespec_data(one);
1676 diff_free_filespec_data(two);
1677 if (data.status)
1678 DIFF_OPT_SET(o, CHECK_FAILED);
1679 }
1680
1681 struct diff_filespec *alloc_filespec(const char *path)
1682 {
1683 int namelen = strlen(path);
1684 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1685
1686 memset(spec, 0, sizeof(*spec));
1687 spec->path = (char *)(spec + 1);
1688 memcpy(spec->path, path, namelen+1);
1689 spec->count = 1;
1690 return spec;
1691 }
1692
1693 void free_filespec(struct diff_filespec *spec)
1694 {
1695 if (!--spec->count) {
1696 diff_free_filespec_data(spec);
1697 free(spec);
1698 }
1699 }
1700
1701 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1702 unsigned short mode)
1703 {
1704 if (mode) {
1705 spec->mode = canon_mode(mode);
1706 hashcpy(spec->sha1, sha1);
1707 spec->sha1_valid = !is_null_sha1(sha1);
1708 }
1709 }
1710
1711 /*
1712 * Given a name and sha1 pair, if the index tells us the file in
1713 * the work tree has that object contents, return true, so that
1714 * prepare_temp_file() does not have to inflate and extract.
1715 */
1716 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1717 {
1718 struct cache_entry *ce;
1719 struct stat st;
1720 int pos, len;
1721
1722 /* We do not read the cache ourselves here, because the
1723 * benchmark with my previous version that always reads cache
1724 * shows that it makes things worse for diff-tree comparing
1725 * two linux-2.6 kernel trees in an already checked out work
1726 * tree. This is because most diff-tree comparisons deal with
1727 * only a small number of files, while reading the cache is
1728 * expensive for a large project, and its cost outweighs the
1729 * savings we get by not inflating the object to a temporary
1730 * file. Practically, this code only helps when we are used
1731 * by diff-cache --cached, which does read the cache before
1732 * calling us.
1733 */
1734 if (!active_cache)
1735 return 0;
1736
1737 /* We want to avoid the working directory if our caller
1738 * doesn't need the data in a normal file, this system
1739 * is rather slow with its stat/open/mmap/close syscalls,
1740 * and the object is contained in a pack file. The pack
1741 * is probably already open and will be faster to obtain
1742 * the data through than the working directory. Loose
1743 * objects however would tend to be slower as they need
1744 * to be individually opened and inflated.
1745 */
1746 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1747 return 0;
1748
1749 len = strlen(name);
1750 pos = cache_name_pos(name, len);
1751 if (pos < 0)
1752 return 0;
1753 ce = active_cache[pos];
1754
1755 /*
1756 * This is not the sha1 we are looking for, or
1757 * unreusable because it is not a regular file.
1758 */
1759 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1760 return 0;
1761
1762 /*
1763 * If ce matches the file in the work tree, we can reuse it.
1764 */
1765 if (ce_uptodate(ce) ||
1766 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1767 return 1;
1768
1769 return 0;
1770 }
1771
1772 static int populate_from_stdin(struct diff_filespec *s)
1773 {
1774 struct strbuf buf;
1775 size_t size = 0;
1776
1777 strbuf_init(&buf, 0);
1778 if (strbuf_read(&buf, 0, 0) < 0)
1779 return error("error while reading from stdin %s",
1780 strerror(errno));
1781
1782 s->should_munmap = 0;
1783 s->data = strbuf_detach(&buf, &size);
1784 s->size = size;
1785 s->should_free = 1;
1786 return 0;
1787 }
1788
1789 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1790 {
1791 int len;
1792 char *data = xmalloc(100);
1793 len = snprintf(data, 100,
1794 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1795 s->data = data;
1796 s->size = len;
1797 s->should_free = 1;
1798 if (size_only) {
1799 s->data = NULL;
1800 free(data);
1801 }
1802 return 0;
1803 }
1804
1805 /*
1806 * While doing rename detection and pickaxe operation, we may need to
1807 * grab the data for the blob (or file) for our own in-core comparison.
1808 * diff_filespec has data and size fields for this purpose.
1809 */
1810 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1811 {
1812 int err = 0;
1813 if (!DIFF_FILE_VALID(s))
1814 die("internal error: asking to populate invalid file.");
1815 if (S_ISDIR(s->mode))
1816 return -1;
1817
1818 if (s->data)
1819 return 0;
1820
1821 if (size_only && 0 < s->size)
1822 return 0;
1823
1824 if (S_ISGITLINK(s->mode))
1825 return diff_populate_gitlink(s, size_only);
1826
1827 if (!s->sha1_valid ||
1828 reuse_worktree_file(s->path, s->sha1, 0)) {
1829 struct strbuf buf;
1830 struct stat st;
1831 int fd;
1832
1833 if (!strcmp(s->path, "-"))
1834 return populate_from_stdin(s);
1835
1836 if (lstat(s->path, &st) < 0) {
1837 if (errno == ENOENT) {
1838 err_empty:
1839 err = -1;
1840 empty:
1841 s->data = (char *)"";
1842 s->size = 0;
1843 return err;
1844 }
1845 }
1846 s->size = xsize_t(st.st_size);
1847 if (!s->size)
1848 goto empty;
1849 if (size_only)
1850 return 0;
1851 if (S_ISLNK(st.st_mode)) {
1852 int ret;
1853 s->data = xmalloc(s->size);
1854 s->should_free = 1;
1855 ret = readlink(s->path, s->data, s->size);
1856 if (ret < 0) {
1857 free(s->data);
1858 goto err_empty;
1859 }
1860 return 0;
1861 }
1862 fd = open(s->path, O_RDONLY);
1863 if (fd < 0)
1864 goto err_empty;
1865 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1866 close(fd);
1867 s->should_munmap = 1;
1868
1869 /*
1870 * Convert from working tree format to canonical git format
1871 */
1872 strbuf_init(&buf, 0);
1873 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
1874 size_t size = 0;
1875 munmap(s->data, s->size);
1876 s->should_munmap = 0;
1877 s->data = strbuf_detach(&buf, &size);
1878 s->size = size;
1879 s->should_free = 1;
1880 }
1881 }
1882 else {
1883 enum object_type type;
1884 if (size_only)
1885 type = sha1_object_info(s->sha1, &s->size);
1886 else {
1887 s->data = read_sha1_file(s->sha1, &type, &s->size);
1888 s->should_free = 1;
1889 }
1890 }
1891 return 0;
1892 }
1893
1894 void diff_free_filespec_blob(struct diff_filespec *s)
1895 {
1896 if (s->should_free)
1897 free(s->data);
1898 else if (s->should_munmap)
1899 munmap(s->data, s->size);
1900
1901 if (s->should_free || s->should_munmap) {
1902 s->should_free = s->should_munmap = 0;
1903 s->data = NULL;
1904 }
1905 }
1906
1907 void diff_free_filespec_data(struct diff_filespec *s)
1908 {
1909 diff_free_filespec_blob(s);
1910 free(s->cnt_data);
1911 s->cnt_data = NULL;
1912 }
1913
1914 static void prep_temp_blob(struct diff_tempfile *temp,
1915 void *blob,
1916 unsigned long size,
1917 const unsigned char *sha1,
1918 int mode)
1919 {
1920 int fd;
1921
1922 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1923 if (fd < 0)
1924 die("unable to create temp-file: %s", strerror(errno));
1925 if (write_in_full(fd, blob, size) != size)
1926 die("unable to write temp-file");
1927 close(fd);
1928 temp->name = temp->tmp_path;
1929 strcpy(temp->hex, sha1_to_hex(sha1));
1930 temp->hex[40] = 0;
1931 sprintf(temp->mode, "%06o", mode);
1932 }
1933
1934 static void prepare_temp_file(const char *name,
1935 struct diff_tempfile *temp,
1936 struct diff_filespec *one)
1937 {
1938 if (!DIFF_FILE_VALID(one)) {
1939 not_a_valid_file:
1940 /* A '-' entry produces this for file-2, and
1941 * a '+' entry produces this for file-1.
1942 */
1943 temp->name = "/dev/null";
1944 strcpy(temp->hex, ".");
1945 strcpy(temp->mode, ".");
1946 return;
1947 }
1948
1949 if (!one->sha1_valid ||
1950 reuse_worktree_file(name, one->sha1, 1)) {
1951 struct stat st;
1952 if (lstat(name, &st) < 0) {
1953 if (errno == ENOENT)
1954 goto not_a_valid_file;
1955 die("stat(%s): %s", name, strerror(errno));
1956 }
1957 if (S_ISLNK(st.st_mode)) {
1958 int ret;
1959 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1960 size_t sz = xsize_t(st.st_size);
1961 if (sizeof(buf) <= st.st_size)
1962 die("symlink too long: %s", name);
1963 ret = readlink(name, buf, sz);
1964 if (ret < 0)
1965 die("readlink(%s)", name);
1966 prep_temp_blob(temp, buf, sz,
1967 (one->sha1_valid ?
1968 one->sha1 : null_sha1),
1969 (one->sha1_valid ?
1970 one->mode : S_IFLNK));
1971 }
1972 else {
1973 /* we can borrow from the file in the work tree */
1974 temp->name = name;
1975 if (!one->sha1_valid)
1976 strcpy(temp->hex, sha1_to_hex(null_sha1));
1977 else
1978 strcpy(temp->hex, sha1_to_hex(one->sha1));
1979 /* Even though we may sometimes borrow the
1980 * contents from the work tree, we always want
1981 * one->mode. mode is trustworthy even when
1982 * !(one->sha1_valid), as long as
1983 * DIFF_FILE_VALID(one).
1984 */
1985 sprintf(temp->mode, "%06o", one->mode);
1986 }
1987 return;
1988 }
1989 else {
1990 if (diff_populate_filespec(one, 0))
1991 die("cannot read data blob for %s", one->path);
1992 prep_temp_blob(temp, one->data, one->size,
1993 one->sha1, one->mode);
1994 }
1995 }
1996
1997 static void remove_tempfile(void)
1998 {
1999 int i;
2000
2001 for (i = 0; i < 2; i++)
2002 if (diff_temp[i].name == diff_temp[i].tmp_path) {
2003 unlink(diff_temp[i].name);
2004 diff_temp[i].name = NULL;
2005 }
2006 }
2007
2008 static void remove_tempfile_on_signal(int signo)
2009 {
2010 remove_tempfile();
2011 signal(SIGINT, SIG_DFL);
2012 raise(signo);
2013 }
2014
2015 /* An external diff command takes:
2016 *
2017 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2018 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2019 *
2020 */
2021 static void run_external_diff(const char *pgm,
2022 const char *name,
2023 const char *other,
2024 struct diff_filespec *one,
2025 struct diff_filespec *two,
2026 const char *xfrm_msg,
2027 int complete_rewrite)
2028 {
2029 const char *spawn_arg[10];
2030 struct diff_tempfile *temp = diff_temp;
2031 int retval;
2032 static int atexit_asked = 0;
2033 const char *othername;
2034 const char **arg = &spawn_arg[0];
2035
2036 othername = (other? other : name);
2037 if (one && two) {
2038 prepare_temp_file(name, &temp[0], one);
2039 prepare_temp_file(othername, &temp[1], two);
2040 if (! atexit_asked &&
2041 (temp[0].name == temp[0].tmp_path ||
2042 temp[1].name == temp[1].tmp_path)) {
2043 atexit_asked = 1;
2044 atexit(remove_tempfile);
2045 }
2046 signal(SIGINT, remove_tempfile_on_signal);
2047 }
2048
2049 if (one && two) {
2050 *arg++ = pgm;
2051 *arg++ = name;
2052 *arg++ = temp[0].name;
2053 *arg++ = temp[0].hex;
2054 *arg++ = temp[0].mode;
2055 *arg++ = temp[1].name;
2056 *arg++ = temp[1].hex;
2057 *arg++ = temp[1].mode;
2058 if (other) {
2059 *arg++ = other;
2060 *arg++ = xfrm_msg;
2061 }
2062 } else {
2063 *arg++ = pgm;
2064 *arg++ = name;
2065 }
2066 *arg = NULL;
2067 fflush(NULL);
2068 retval = run_command_v_opt(spawn_arg, 0);
2069 remove_tempfile();
2070 if (retval) {
2071 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2072 exit(1);
2073 }
2074 }
2075
2076 static const char *external_diff_attr(const char *name)
2077 {
2078 struct git_attr_check attr_diff_check;
2079
2080 if (!name)
2081 return NULL;
2082
2083 setup_diff_attr_check(&attr_diff_check);
2084 if (!git_checkattr(name, 1, &attr_diff_check)) {
2085 const char *value = attr_diff_check.value;
2086 if (!ATTR_TRUE(value) &&
2087 !ATTR_FALSE(value) &&
2088 !ATTR_UNSET(value)) {
2089 struct ll_diff_driver *drv;
2090
2091 for (drv = user_diff; drv; drv = drv->next)
2092 if (!strcmp(drv->name, value))
2093 return drv->cmd;
2094 }
2095 }
2096 return NULL;
2097 }
2098
2099 static void run_diff_cmd(const char *pgm,
2100 const char *name,
2101 const char *other,
2102 const char *attr_path,
2103 struct diff_filespec *one,
2104 struct diff_filespec *two,
2105 const char *xfrm_msg,
2106 struct diff_options *o,
2107 int complete_rewrite)
2108 {
2109 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2110 pgm = NULL;
2111 else {
2112 const char *cmd = external_diff_attr(attr_path);
2113 if (cmd)
2114 pgm = cmd;
2115 }
2116
2117 if (pgm) {
2118 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2119 complete_rewrite);
2120 return;
2121 }
2122 if (one && two)
2123 builtin_diff(name, other ? other : name,
2124 one, two, xfrm_msg, o, complete_rewrite);
2125 else
2126 fprintf(o->file, "* Unmerged path %s\n", name);
2127 }
2128
2129 static void diff_fill_sha1_info(struct diff_filespec *one)
2130 {
2131 if (DIFF_FILE_VALID(one)) {
2132 if (!one->sha1_valid) {
2133 struct stat st;
2134 if (!strcmp(one->path, "-")) {
2135 hashcpy(one->sha1, null_sha1);
2136 return;
2137 }
2138 if (lstat(one->path, &st) < 0)
2139 die("stat %s", one->path);
2140 if (index_path(one->sha1, one->path, &st, 0))
2141 die("cannot hash %s\n", one->path);
2142 }
2143 }
2144 else
2145 hashclr(one->sha1);
2146 }
2147
2148 static int similarity_index(struct diff_filepair *p)
2149 {
2150 return p->score * 100 / MAX_SCORE;
2151 }
2152
2153 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2154 {
2155 /* Strip the prefix but do not molest /dev/null and absolute paths */
2156 if (*namep && **namep != '/')
2157 *namep += prefix_length;
2158 if (*otherp && **otherp != '/')
2159 *otherp += prefix_length;
2160 }
2161
2162 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2163 {
2164 const char *pgm = external_diff();
2165 struct strbuf msg;
2166 char *xfrm_msg;
2167 struct diff_filespec *one = p->one;
2168 struct diff_filespec *two = p->two;
2169 const char *name;
2170 const char *other;
2171 const char *attr_path;
2172 int complete_rewrite = 0;
2173
2174 name = p->one->path;
2175 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2176 attr_path = name;
2177 if (o->prefix_length)
2178 strip_prefix(o->prefix_length, &name, &other);
2179
2180 if (DIFF_PAIR_UNMERGED(p)) {
2181 run_diff_cmd(pgm, name, NULL, attr_path,
2182 NULL, NULL, NULL, o, 0);
2183 return;
2184 }
2185
2186 diff_fill_sha1_info(one);
2187 diff_fill_sha1_info(two);
2188
2189 strbuf_init(&msg, PATH_MAX * 2 + 300);
2190 switch (p->status) {
2191 case DIFF_STATUS_COPIED:
2192 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2193 strbuf_addstr(&msg, "\ncopy from ");
2194 quote_c_style(name, &msg, NULL, 0);
2195 strbuf_addstr(&msg, "\ncopy to ");
2196 quote_c_style(other, &msg, NULL, 0);
2197 strbuf_addch(&msg, '\n');
2198 break;
2199 case DIFF_STATUS_RENAMED:
2200 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2201 strbuf_addstr(&msg, "\nrename from ");
2202 quote_c_style(name, &msg, NULL, 0);
2203 strbuf_addstr(&msg, "\nrename to ");
2204 quote_c_style(other, &msg, NULL, 0);
2205 strbuf_addch(&msg, '\n');
2206 break;
2207 case DIFF_STATUS_MODIFIED:
2208 if (p->score) {
2209 strbuf_addf(&msg, "dissimilarity index %d%%\n",
2210 similarity_index(p));
2211 complete_rewrite = 1;
2212 break;
2213 }
2214 /* fallthru */
2215 default:
2216 /* nothing */
2217 ;
2218 }
2219
2220 if (hashcmp(one->sha1, two->sha1)) {
2221 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2222
2223 if (DIFF_OPT_TST(o, BINARY)) {
2224 mmfile_t mf;
2225 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2226 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2227 abbrev = 40;
2228 }
2229 strbuf_addf(&msg, "index %.*s..%.*s",
2230 abbrev, sha1_to_hex(one->sha1),
2231 abbrev, sha1_to_hex(two->sha1));
2232 if (one->mode == two->mode)
2233 strbuf_addf(&msg, " %06o", one->mode);
2234 strbuf_addch(&msg, '\n');
2235 }
2236
2237 if (msg.len)
2238 strbuf_setlen(&msg, msg.len - 1);
2239 xfrm_msg = msg.len ? msg.buf : NULL;
2240
2241 if (!pgm &&
2242 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2243 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2244 /* a filepair that changes between file and symlink
2245 * needs to be split into deletion and creation.
2246 */
2247 struct diff_filespec *null = alloc_filespec(two->path);
2248 run_diff_cmd(NULL, name, other, attr_path,
2249 one, null, xfrm_msg, o, 0);
2250 free(null);
2251 null = alloc_filespec(one->path);
2252 run_diff_cmd(NULL, name, other, attr_path,
2253 null, two, xfrm_msg, o, 0);
2254 free(null);
2255 }
2256 else
2257 run_diff_cmd(pgm, name, other, attr_path,
2258 one, two, xfrm_msg, o, complete_rewrite);
2259
2260 strbuf_release(&msg);
2261 }
2262
2263 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2264 struct diffstat_t *diffstat)
2265 {
2266 const char *name;
2267 const char *other;
2268 int complete_rewrite = 0;
2269
2270 if (DIFF_PAIR_UNMERGED(p)) {
2271 /* unmerged */
2272 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2273 return;
2274 }
2275
2276 name = p->one->path;
2277 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2278
2279 if (o->prefix_length)
2280 strip_prefix(o->prefix_length, &name, &other);
2281
2282 diff_fill_sha1_info(p->one);
2283 diff_fill_sha1_info(p->two);
2284
2285 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2286 complete_rewrite = 1;
2287 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2288 }
2289
2290 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2291 {
2292 const char *name;
2293 const char *other;
2294 const char *attr_path;
2295
2296 if (DIFF_PAIR_UNMERGED(p)) {
2297 /* unmerged */
2298 return;
2299 }
2300
2301 name = p->one->path;
2302 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2303 attr_path = other ? other : name;
2304
2305 if (o->prefix_length)
2306 strip_prefix(o->prefix_length, &name, &other);
2307
2308 diff_fill_sha1_info(p->one);
2309 diff_fill_sha1_info(p->two);
2310
2311 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2312 }
2313
2314 void diff_setup(struct diff_options *options)
2315 {
2316 memset(options, 0, sizeof(*options));
2317
2318 options->file = stdout;
2319
2320 options->line_termination = '\n';
2321 options->break_opt = -1;
2322 options->rename_limit = -1;
2323 options->dirstat_percent = 3;
2324 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
2325 options->context = 3;
2326
2327 options->change = diff_change;
2328 options->add_remove = diff_addremove;
2329 if (diff_use_color_default > 0)
2330 DIFF_OPT_SET(options, COLOR_DIFF);
2331 else
2332 DIFF_OPT_CLR(options, COLOR_DIFF);
2333 options->detect_rename = diff_detect_rename_default;
2334
2335 options->a_prefix = "a/";
2336 options->b_prefix = "b/";
2337 }
2338
2339 int diff_setup_done(struct diff_options *options)
2340 {
2341 int count = 0;
2342
2343 if (options->output_format & DIFF_FORMAT_NAME)
2344 count++;
2345 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2346 count++;
2347 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2348 count++;
2349 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2350 count++;
2351 if (count > 1)
2352 die("--name-only, --name-status, --check and -s are mutually exclusive");
2353
2354 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2355 options->detect_rename = DIFF_DETECT_COPY;
2356
2357 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2358 options->prefix = NULL;
2359 if (options->prefix)
2360 options->prefix_length = strlen(options->prefix);
2361 else
2362 options->prefix_length = 0;
2363
2364 if (options->output_format & (DIFF_FORMAT_NAME |
2365 DIFF_FORMAT_NAME_STATUS |
2366 DIFF_FORMAT_CHECKDIFF |
2367 DIFF_FORMAT_NO_OUTPUT))
2368 options->output_format &= ~(DIFF_FORMAT_RAW |
2369 DIFF_FORMAT_NUMSTAT |
2370 DIFF_FORMAT_DIFFSTAT |
2371 DIFF_FORMAT_SHORTSTAT |
2372 DIFF_FORMAT_DIRSTAT |
2373 DIFF_FORMAT_SUMMARY |
2374 DIFF_FORMAT_PATCH);
2375
2376 /*
2377 * These cases always need recursive; we do not drop caller-supplied
2378 * recursive bits for other formats here.
2379 */
2380 if (options->output_format & (DIFF_FORMAT_PATCH |
2381 DIFF_FORMAT_NUMSTAT |
2382 DIFF_FORMAT_DIFFSTAT |
2383 DIFF_FORMAT_SHORTSTAT |
2384 DIFF_FORMAT_DIRSTAT |
2385 DIFF_FORMAT_SUMMARY |
2386 DIFF_FORMAT_CHECKDIFF))
2387 DIFF_OPT_SET(options, RECURSIVE);
2388 /*
2389 * Also pickaxe would not work very well if you do not say recursive
2390 */
2391 if (options->pickaxe)
2392 DIFF_OPT_SET(options, RECURSIVE);
2393
2394 if (options->detect_rename && options->rename_limit < 0)
2395 options->rename_limit = diff_rename_limit_default;
2396 if (options->setup & DIFF_SETUP_USE_CACHE) {
2397 if (!active_cache)
2398 /* read-cache does not die even when it fails
2399 * so it is safe for us to do this here. Also
2400 * it does not smudge active_cache or active_nr
2401 * when it fails, so we do not have to worry about
2402 * cleaning it up ourselves either.
2403 */
2404 read_cache();
2405 }
2406 if (options->abbrev <= 0 || 40 < options->abbrev)
2407 options->abbrev = 40; /* full */
2408
2409 /*
2410 * It does not make sense to show the first hit we happened
2411 * to have found. It does not make sense not to return with
2412 * exit code in such a case either.
2413 */
2414 if (DIFF_OPT_TST(options, QUIET)) {
2415 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2416 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2417 }
2418
2419 return 0;
2420 }
2421
2422 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2423 {
2424 char c, *eq;
2425 int len;
2426
2427 if (*arg != '-')
2428 return 0;
2429 c = *++arg;
2430 if (!c)
2431 return 0;
2432 if (c == arg_short) {
2433 c = *++arg;
2434 if (!c)
2435 return 1;
2436 if (val && isdigit(c)) {
2437 char *end;
2438 int n = strtoul(arg, &end, 10);
2439 if (*end)
2440 return 0;
2441 *val = n;
2442 return 1;
2443 }
2444 return 0;
2445 }
2446 if (c != '-')
2447 return 0;
2448 arg++;
2449 eq = strchr(arg, '=');
2450 if (eq)
2451 len = eq - arg;
2452 else
2453 len = strlen(arg);
2454 if (!len || strncmp(arg, arg_long, len))
2455 return 0;
2456 if (eq) {
2457 int n;
2458 char *end;
2459 if (!isdigit(*++eq))
2460 return 0;
2461 n = strtoul(eq, &end, 10);
2462 if (*end)
2463 return 0;
2464 *val = n;
2465 }
2466 return 1;
2467 }
2468
2469 static int diff_scoreopt_parse(const char *opt);
2470
2471 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2472 {
2473 const char *arg = av[0];
2474
2475 /* Output format options */
2476 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2477 options->output_format |= DIFF_FORMAT_PATCH;
2478 else if (opt_arg(arg, 'U', "unified", &options->context))
2479 options->output_format |= DIFF_FORMAT_PATCH;
2480 else if (!strcmp(arg, "--raw"))
2481 options->output_format |= DIFF_FORMAT_RAW;
2482 else if (!strcmp(arg, "--patch-with-raw"))
2483 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2484 else if (!strcmp(arg, "--numstat"))
2485 options->output_format |= DIFF_FORMAT_NUMSTAT;
2486 else if (!strcmp(arg, "--shortstat"))
2487 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2488 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2489 options->output_format |= DIFF_FORMAT_DIRSTAT;
2490 else if (!strcmp(arg, "--cumulative")) {
2491 options->output_format |= DIFF_FORMAT_DIRSTAT;
2492 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
2493 }
2494 else if (!strcmp(arg, "--check"))
2495 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2496 else if (!strcmp(arg, "--summary"))
2497 options->output_format |= DIFF_FORMAT_SUMMARY;
2498 else if (!strcmp(arg, "--patch-with-stat"))
2499 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2500 else if (!strcmp(arg, "--name-only"))
2501 options->output_format |= DIFF_FORMAT_NAME;
2502 else if (!strcmp(arg, "--name-status"))
2503 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2504 else if (!strcmp(arg, "-s"))
2505 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2506 else if (!prefixcmp(arg, "--stat")) {
2507 char *end;
2508 int width = options->stat_width;
2509 int name_width = options->stat_name_width;
2510 arg += 6;
2511 end = (char *)arg;
2512
2513 switch (*arg) {
2514 case '-':
2515 if (!prefixcmp(arg, "-width="))
2516 width = strtoul(arg + 7, &end, 10);
2517 else if (!prefixcmp(arg, "-name-width="))
2518 name_width = strtoul(arg + 12, &end, 10);
2519 break;
2520 case '=':
2521 width = strtoul(arg+1, &end, 10);
2522 if (*end == ',')
2523 name_width = strtoul(end+1, &end, 10);
2524 }
2525
2526 /* Important! This checks all the error cases! */
2527 if (*end)
2528 return 0;
2529 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2530 options->stat_name_width = name_width;
2531 options->stat_width = width;
2532 }
2533
2534 /* renames options */
2535 else if (!prefixcmp(arg, "-B")) {
2536 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2537 return -1;
2538 }
2539 else if (!prefixcmp(arg, "-M")) {
2540 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2541 return -1;
2542 options->detect_rename = DIFF_DETECT_RENAME;
2543 }
2544 else if (!prefixcmp(arg, "-C")) {
2545 if (options->detect_rename == DIFF_DETECT_COPY)
2546 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2547 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2548 return -1;
2549 options->detect_rename = DIFF_DETECT_COPY;
2550 }
2551 else if (!strcmp(arg, "--no-renames"))
2552 options->detect_rename = 0;
2553 else if (!strcmp(arg, "--relative"))
2554 DIFF_OPT_SET(options, RELATIVE_NAME);
2555 else if (!prefixcmp(arg, "--relative=")) {
2556 DIFF_OPT_SET(options, RELATIVE_NAME);
2557 options->prefix = arg + 11;
2558 }
2559
2560 /* xdiff options */
2561 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2562 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2563 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2564 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2565 else if (!strcmp(arg, "--ignore-space-at-eol"))
2566 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2567
2568 /* flags options */
2569 else if (!strcmp(arg, "--binary")) {
2570 options->output_format |= DIFF_FORMAT_PATCH;
2571 DIFF_OPT_SET(options, BINARY);
2572 }
2573 else if (!strcmp(arg, "--full-index"))
2574 DIFF_OPT_SET(options, FULL_INDEX);
2575 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2576 DIFF_OPT_SET(options, TEXT);
2577 else if (!strcmp(arg, "-R"))
2578 DIFF_OPT_SET(options, REVERSE_DIFF);
2579 else if (!strcmp(arg, "--find-copies-harder"))
2580 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2581 else if (!strcmp(arg, "--follow"))
2582 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2583 else if (!strcmp(arg, "--color"))
2584 DIFF_OPT_SET(options, COLOR_DIFF);
2585 else if (!strcmp(arg, "--no-color"))
2586 DIFF_OPT_CLR(options, COLOR_DIFF);
2587 else if (!strcmp(arg, "--color-words"))
2588 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2589 else if (!strcmp(arg, "--exit-code"))
2590 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2591 else if (!strcmp(arg, "--quiet"))
2592 DIFF_OPT_SET(options, QUIET);
2593 else if (!strcmp(arg, "--ext-diff"))
2594 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2595 else if (!strcmp(arg, "--no-ext-diff"))
2596 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2597 else if (!strcmp(arg, "--ignore-submodules"))
2598 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2599
2600 /* misc options */
2601 else if (!strcmp(arg, "-z"))
2602 options->line_termination = 0;
2603 else if (!prefixcmp(arg, "-l"))
2604 options->rename_limit = strtoul(arg+2, NULL, 10);
2605 else if (!prefixcmp(arg, "-S"))
2606 options->pickaxe = arg + 2;
2607 else if (!strcmp(arg, "--pickaxe-all"))
2608 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2609 else if (!strcmp(arg, "--pickaxe-regex"))
2610 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2611 else if (!prefixcmp(arg, "-O"))
2612 options->orderfile = arg + 2;
2613 else if (!prefixcmp(arg, "--diff-filter="))
2614 options->filter = arg + 14;
2615 else if (!strcmp(arg, "--abbrev"))
2616 options->abbrev = DEFAULT_ABBREV;
2617 else if (!prefixcmp(arg, "--abbrev=")) {
2618 options->abbrev = strtoul(arg + 9, NULL, 10);
2619 if (options->abbrev < MINIMUM_ABBREV)
2620 options->abbrev = MINIMUM_ABBREV;
2621 else if (40 < options->abbrev)
2622 options->abbrev = 40;
2623 }
2624 else if (!prefixcmp(arg, "--src-prefix="))
2625 options->a_prefix = arg + 13;
2626 else if (!prefixcmp(arg, "--dst-prefix="))
2627 options->b_prefix = arg + 13;
2628 else if (!strcmp(arg, "--no-prefix"))
2629 options->a_prefix = options->b_prefix = "";
2630 else if (!prefixcmp(arg, "--output=")) {
2631 options->file = fopen(arg + strlen("--output="), "w");
2632 options->close_file = 1;
2633 } else
2634 return 0;
2635 return 1;
2636 }
2637
2638 static int parse_num(const char **cp_p)
2639 {
2640 unsigned long num, scale;
2641 int ch, dot;
2642 const char *cp = *cp_p;
2643
2644 num = 0;
2645 scale = 1;
2646 dot = 0;
2647 for(;;) {
2648 ch = *cp;
2649 if ( !dot && ch == '.' ) {
2650 scale = 1;
2651 dot = 1;
2652 } else if ( ch == '%' ) {
2653 scale = dot ? scale*100 : 100;
2654 cp++; /* % is always at the end */
2655 break;
2656 } else if ( ch >= '0' && ch <= '9' ) {
2657 if ( scale < 100000 ) {
2658 scale *= 10;
2659 num = (num*10) + (ch-'0');
2660 }
2661 } else {
2662 break;
2663 }
2664 cp++;
2665 }
2666 *cp_p = cp;
2667
2668 /* user says num divided by scale and we say internally that
2669 * is MAX_SCORE * num / scale.
2670 */
2671 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2672 }
2673
2674 static int diff_scoreopt_parse(const char *opt)
2675 {
2676 int opt1, opt2, cmd;
2677
2678 if (*opt++ != '-')
2679 return -1;
2680 cmd = *opt++;
2681 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2682 return -1; /* that is not a -M, -C nor -B option */
2683
2684 opt1 = parse_num(&opt);
2685 if (cmd != 'B')
2686 opt2 = 0;
2687 else {
2688 if (*opt == 0)
2689 opt2 = 0;
2690 else if (*opt != '/')
2691 return -1; /* we expect -B80/99 or -B80 */
2692 else {
2693 opt++;
2694 opt2 = parse_num(&opt);
2695 }
2696 }
2697 if (*opt != 0)
2698 return -1;
2699 return opt1 | (opt2 << 16);
2700 }
2701
2702 struct diff_queue_struct diff_queued_diff;
2703
2704 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2705 {
2706 if (queue->alloc <= queue->nr) {
2707 queue->alloc = alloc_nr(queue->alloc);
2708 queue->queue = xrealloc(queue->queue,
2709 sizeof(dp) * queue->alloc);
2710 }
2711 queue->queue[queue->nr++] = dp;
2712 }
2713
2714 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2715 struct diff_filespec *one,
2716 struct diff_filespec *two)
2717 {
2718 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2719 dp->one = one;
2720 dp->two = two;
2721 if (queue)
2722 diff_q(queue, dp);
2723 return dp;
2724 }
2725
2726 void diff_free_filepair(struct diff_filepair *p)
2727 {
2728 free_filespec(p->one);
2729 free_filespec(p->two);
2730 free(p);
2731 }
2732
2733 /* This is different from find_unique_abbrev() in that
2734 * it stuffs the result with dots for alignment.
2735 */
2736 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2737 {
2738 int abblen;
2739 const char *abbrev;
2740 if (len == 40)
2741 return sha1_to_hex(sha1);
2742
2743 abbrev = find_unique_abbrev(sha1, len);
2744 abblen = strlen(abbrev);
2745 if (abblen < 37) {
2746 static char hex[41];
2747 if (len < abblen && abblen <= len + 2)
2748 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2749 else
2750 sprintf(hex, "%s...", abbrev);
2751 return hex;
2752 }
2753 return sha1_to_hex(sha1);
2754 }
2755
2756 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2757 {
2758 int line_termination = opt->line_termination;
2759 int inter_name_termination = line_termination ? '\t' : '\0';
2760
2761 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2762 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2763 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2764 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2765 }
2766 if (p->score) {
2767 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2768 inter_name_termination);
2769 } else {
2770 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
2771 }
2772
2773 if (p->status == DIFF_STATUS_COPIED ||
2774 p->status == DIFF_STATUS_RENAMED) {
2775 const char *name_a, *name_b;
2776 name_a = p->one->path;
2777 name_b = p->two->path;
2778 strip_prefix(opt->prefix_length, &name_a, &name_b);
2779 write_name_quoted(name_a, opt->file, inter_name_termination);
2780 write_name_quoted(name_b, opt->file, line_termination);
2781 } else {
2782 const char *name_a, *name_b;
2783 name_a = p->one->mode ? p->one->path : p->two->path;
2784 name_b = NULL;
2785 strip_prefix(opt->prefix_length, &name_a, &name_b);
2786 write_name_quoted(name_a, opt->file, line_termination);
2787 }
2788 }
2789
2790 int diff_unmodified_pair(struct diff_filepair *p)
2791 {
2792 /* This function is written stricter than necessary to support
2793 * the currently implemented transformers, but the idea is to
2794 * let transformers to produce diff_filepairs any way they want,
2795 * and filter and clean them up here before producing the output.
2796 */
2797 struct diff_filespec *one = p->one, *two = p->two;
2798
2799 if (DIFF_PAIR_UNMERGED(p))
2800 return 0; /* unmerged is interesting */
2801
2802 /* deletion, addition, mode or type change
2803 * and rename are all interesting.
2804 */
2805 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2806 DIFF_PAIR_MODE_CHANGED(p) ||
2807 strcmp(one->path, two->path))
2808 return 0;
2809
2810 /* both are valid and point at the same path. that is, we are
2811 * dealing with a change.
2812 */
2813 if (one->sha1_valid && two->sha1_valid &&
2814 !hashcmp(one->sha1, two->sha1))
2815 return 1; /* no change */
2816 if (!one->sha1_valid && !two->sha1_valid)
2817 return 1; /* both look at the same file on the filesystem. */
2818 return 0;
2819 }
2820
2821 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2822 {
2823 if (diff_unmodified_pair(p))
2824 return;
2825
2826 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2827 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2828 return; /* no tree diffs in patch format */
2829
2830 run_diff(p, o);
2831 }
2832
2833 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2834 struct diffstat_t *diffstat)
2835 {
2836 if (diff_unmodified_pair(p))
2837 return;
2838
2839 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2840 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2841 return; /* no tree diffs in patch format */
2842
2843 run_diffstat(p, o, diffstat);
2844 }
2845
2846 static void diff_flush_checkdiff(struct diff_filepair *p,
2847 struct diff_options *o)
2848 {
2849 if (diff_unmodified_pair(p))
2850 return;
2851
2852 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2853 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2854 return; /* no tree diffs in patch format */
2855
2856 run_checkdiff(p, o);
2857 }
2858
2859 int diff_queue_is_empty(void)
2860 {
2861 struct diff_queue_struct *q = &diff_queued_diff;
2862 int i;
2863 for (i = 0; i < q->nr; i++)
2864 if (!diff_unmodified_pair(q->queue[i]))
2865 return 0;
2866 return 1;
2867 }
2868
2869 #if DIFF_DEBUG
2870 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2871 {
2872 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2873 x, one ? one : "",
2874 s->path,
2875 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2876 s->mode,
2877 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2878 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2879 x, one ? one : "",
2880 s->size, s->xfrm_flags);
2881 }
2882
2883 void diff_debug_filepair(const struct diff_filepair *p, int i)
2884 {
2885 diff_debug_filespec(p->one, i, "one");
2886 diff_debug_filespec(p->two, i, "two");
2887 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2888 p->score, p->status ? p->status : '?',
2889 p->one->rename_used, p->broken_pair);
2890 }
2891
2892 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2893 {
2894 int i;
2895 if (msg)
2896 fprintf(stderr, "%s\n", msg);
2897 fprintf(stderr, "q->nr = %d\n", q->nr);
2898 for (i = 0; i < q->nr; i++) {
2899 struct diff_filepair *p = q->queue[i];
2900 diff_debug_filepair(p, i);
2901 }
2902 }
2903 #endif
2904
2905 static void diff_resolve_rename_copy(void)
2906 {
2907 int i;
2908 struct diff_filepair *p;
2909 struct diff_queue_struct *q = &diff_queued_diff;
2910
2911 diff_debug_queue("resolve-rename-copy", q);
2912
2913 for (i = 0; i < q->nr; i++) {
2914 p = q->queue[i];
2915 p->status = 0; /* undecided */
2916 if (DIFF_PAIR_UNMERGED(p))
2917 p->status = DIFF_STATUS_UNMERGED;
2918 else if (!DIFF_FILE_VALID(p->one))
2919 p->status = DIFF_STATUS_ADDED;
2920 else if (!DIFF_FILE_VALID(p->two))
2921 p->status = DIFF_STATUS_DELETED;
2922 else if (DIFF_PAIR_TYPE_CHANGED(p))
2923 p->status = DIFF_STATUS_TYPE_CHANGED;
2924
2925 /* from this point on, we are dealing with a pair
2926 * whose both sides are valid and of the same type, i.e.
2927 * either in-place edit or rename/copy edit.
2928 */
2929 else if (DIFF_PAIR_RENAME(p)) {
2930 /*
2931 * A rename might have re-connected a broken
2932 * pair up, causing the pathnames to be the
2933 * same again. If so, that's not a rename at
2934 * all, just a modification..
2935 *
2936 * Otherwise, see if this source was used for
2937 * multiple renames, in which case we decrement
2938 * the count, and call it a copy.
2939 */
2940 if (!strcmp(p->one->path, p->two->path))
2941 p->status = DIFF_STATUS_MODIFIED;
2942 else if (--p->one->rename_used > 0)
2943 p->status = DIFF_STATUS_COPIED;
2944 else
2945 p->status = DIFF_STATUS_RENAMED;
2946 }
2947 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2948 p->one->mode != p->two->mode ||
2949 is_null_sha1(p->one->sha1))
2950 p->status = DIFF_STATUS_MODIFIED;
2951 else {
2952 /* This is a "no-change" entry and should not
2953 * happen anymore, but prepare for broken callers.
2954 */
2955 error("feeding unmodified %s to diffcore",
2956 p->one->path);
2957 p->status = DIFF_STATUS_UNKNOWN;
2958 }
2959 }
2960 diff_debug_queue("resolve-rename-copy done", q);
2961 }
2962
2963 static int check_pair_status(struct diff_filepair *p)
2964 {
2965 switch (p->status) {
2966 case DIFF_STATUS_UNKNOWN:
2967 return 0;
2968 case 0:
2969 die("internal error in diff-resolve-rename-copy");
2970 default:
2971 return 1;
2972 }
2973 }
2974
2975 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2976 {
2977 int fmt = opt->output_format;
2978
2979 if (fmt & DIFF_FORMAT_CHECKDIFF)
2980 diff_flush_checkdiff(p, opt);
2981 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2982 diff_flush_raw(p, opt);
2983 else if (fmt & DIFF_FORMAT_NAME) {
2984 const char *name_a, *name_b;
2985 name_a = p->two->path;
2986 name_b = NULL;
2987 strip_prefix(opt->prefix_length, &name_a, &name_b);
2988 write_name_quoted(name_a, opt->file, opt->line_termination);
2989 }
2990 }
2991
2992 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
2993 {
2994 if (fs->mode)
2995 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
2996 else
2997 fprintf(file, " %s ", newdelete);
2998 write_name_quoted(fs->path, file, '\n');
2999 }
3000
3001
3002 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
3003 {
3004 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3005 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
3006 show_name ? ' ' : '\n');
3007 if (show_name) {
3008 write_name_quoted(p->two->path, file, '\n');
3009 }
3010 }
3011 }
3012
3013 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
3014 {
3015 char *names = pprint_rename(p->one->path, p->two->path);
3016
3017 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3018 free(names);
3019 show_mode_change(file, p, 0);
3020 }
3021
3022 static void diff_summary(FILE *file, struct diff_filepair *p)
3023 {
3024 switch(p->status) {
3025 case DIFF_STATUS_DELETED:
3026 show_file_mode_name(file, "delete", p->one);
3027 break;
3028 case DIFF_STATUS_ADDED:
3029 show_file_mode_name(file, "create", p->two);
3030 break;
3031 case DIFF_STATUS_COPIED:
3032 show_rename_copy(file, "copy", p);
3033 break;
3034 case DIFF_STATUS_RENAMED:
3035 show_rename_copy(file, "rename", p);
3036 break;
3037 default:
3038 if (p->score) {
3039 fputs(" rewrite ", file);
3040 write_name_quoted(p->two->path, file, ' ');
3041 fprintf(file, "(%d%%)\n", similarity_index(p));
3042 }
3043 show_mode_change(file, p, !p->score);
3044 break;
3045 }
3046 }
3047
3048 struct patch_id_t {
3049 struct xdiff_emit_state xm;
3050 SHA_CTX *ctx;
3051 int patchlen;
3052 };
3053
3054 static int remove_space(char *line, int len)
3055 {
3056 int i;
3057 char *dst = line;
3058 unsigned char c;
3059
3060 for (i = 0; i < len; i++)
3061 if (!isspace((c = line[i])))
3062 *dst++ = c;
3063
3064 return dst - line;
3065 }
3066
3067 static void patch_id_consume(void *priv, char *line, unsigned long len)
3068 {
3069 struct patch_id_t *data = priv;
3070 int new_len;
3071
3072 /* Ignore line numbers when computing the SHA1 of the patch */
3073 if (!prefixcmp(line, "@@ -"))
3074 return;
3075
3076 new_len = remove_space(line, len);
3077
3078 SHA1_Update(data->ctx, line, new_len);
3079 data->patchlen += new_len;
3080 }
3081
3082 /* returns 0 upon success, and writes result into sha1 */
3083 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3084 {
3085 struct diff_queue_struct *q = &diff_queued_diff;
3086 int i;
3087 SHA_CTX ctx;
3088 struct patch_id_t data;
3089 char buffer[PATH_MAX * 4 + 20];
3090
3091 SHA1_Init(&ctx);
3092 memset(&data, 0, sizeof(struct patch_id_t));
3093 data.ctx = &ctx;
3094 data.xm.consume = patch_id_consume;
3095
3096 for (i = 0; i < q->nr; i++) {
3097 xpparam_t xpp;
3098 xdemitconf_t xecfg;
3099 xdemitcb_t ecb;
3100 mmfile_t mf1, mf2;
3101 struct diff_filepair *p = q->queue[i];
3102 int len1, len2;
3103
3104 memset(&xecfg, 0, sizeof(xecfg));
3105 if (p->status == 0)
3106 return error("internal diff status error");
3107 if (p->status == DIFF_STATUS_UNKNOWN)
3108 continue;
3109 if (diff_unmodified_pair(p))
3110 continue;
3111 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3112 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3113 continue;
3114 if (DIFF_PAIR_UNMERGED(p))
3115 continue;
3116
3117 diff_fill_sha1_info(p->one);
3118 diff_fill_sha1_info(p->two);
3119 if (fill_mmfile(&mf1, p->one) < 0 ||
3120 fill_mmfile(&mf2, p->two) < 0)
3121 return error("unable to read files to diff");
3122
3123 len1 = remove_space(p->one->path, strlen(p->one->path));
3124 len2 = remove_space(p->two->path, strlen(p->two->path));
3125 if (p->one->mode == 0)
3126 len1 = snprintf(buffer, sizeof(buffer),
3127 "diff--gita/%.*sb/%.*s"
3128 "newfilemode%06o"
3129 "---/dev/null"
3130 "+++b/%.*s",
3131 len1, p->one->path,
3132 len2, p->two->path,
3133 p->two->mode,
3134 len2, p->two->path);
3135 else if (p->two->mode == 0)
3136 len1 = snprintf(buffer, sizeof(buffer),
3137 "diff--gita/%.*sb/%.*s"
3138 "deletedfilemode%06o"
3139 "---a/%.*s"
3140 "+++/dev/null",
3141 len1, p->one->path,
3142 len2, p->two->path,
3143 p->one->mode,
3144 len1, p->one->path);
3145 else
3146 len1 = snprintf(buffer, sizeof(buffer),
3147 "diff--gita/%.*sb/%.*s"
3148 "---a/%.*s"
3149 "+++b/%.*s",
3150 len1, p->one->path,
3151 len2, p->two->path,
3152 len1, p->one->path,
3153 len2, p->two->path);
3154 SHA1_Update(&ctx, buffer, len1);
3155
3156 xpp.flags = XDF_NEED_MINIMAL;
3157 xecfg.ctxlen = 3;
3158 xecfg.flags = XDL_EMIT_FUNCNAMES;
3159 ecb.outf = xdiff_outf;
3160 ecb.priv = &data;
3161 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
3162 }
3163
3164 SHA1_Final(sha1, &ctx);
3165 return 0;
3166 }
3167
3168 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3169 {
3170 struct diff_queue_struct *q = &diff_queued_diff;
3171 int i;
3172 int result = diff_get_patch_id(options, sha1);
3173
3174 for (i = 0; i < q->nr; i++)
3175 diff_free_filepair(q->queue[i]);
3176
3177 free(q->queue);
3178 q->queue = NULL;
3179 q->nr = q->alloc = 0;
3180
3181 return result;
3182 }
3183
3184 static int is_summary_empty(const struct diff_queue_struct *q)
3185 {
3186 int i;
3187
3188 for (i = 0; i < q->nr; i++) {
3189 const struct diff_filepair *p = q->queue[i];
3190
3191 switch (p->status) {
3192 case DIFF_STATUS_DELETED:
3193 case DIFF_STATUS_ADDED:
3194 case DIFF_STATUS_COPIED:
3195 case DIFF_STATUS_RENAMED:
3196 return 0;
3197 default:
3198 if (p->score)
3199 return 0;
3200 if (p->one->mode && p->two->mode &&
3201 p->one->mode != p->two->mode)
3202 return 0;
3203 break;
3204 }
3205 }
3206 return 1;
3207 }
3208
3209 void diff_flush(struct diff_options *options)
3210 {
3211 struct diff_queue_struct *q = &diff_queued_diff;
3212 int i, output_format = options->output_format;
3213 int separator = 0;
3214
3215 /*
3216 * Order: raw, stat, summary, patch
3217 * or: name/name-status/checkdiff (other bits clear)
3218 */
3219 if (!q->nr)
3220 goto free_queue;
3221
3222 if (output_format & (DIFF_FORMAT_RAW |
3223 DIFF_FORMAT_NAME |
3224 DIFF_FORMAT_NAME_STATUS |
3225 DIFF_FORMAT_CHECKDIFF)) {
3226 for (i = 0; i < q->nr; i++) {
3227 struct diff_filepair *p = q->queue[i];
3228 if (check_pair_status(p))
3229 flush_one_pair(p, options);
3230 }
3231 separator++;
3232 }
3233
3234 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3235 struct diffstat_t diffstat;
3236
3237 memset(&diffstat, 0, sizeof(struct diffstat_t));
3238 diffstat.xm.consume = diffstat_consume;
3239 for (i = 0; i < q->nr; i++) {
3240 struct diff_filepair *p = q->queue[i];
3241 if (check_pair_status(p))
3242 diff_flush_stat(p, options, &diffstat);
3243 }
3244 if (output_format & DIFF_FORMAT_NUMSTAT)
3245 show_numstat(&diffstat, options);
3246 if (output_format & DIFF_FORMAT_DIFFSTAT)
3247 show_stats(&diffstat, options);
3248 if (output_format & DIFF_FORMAT_SHORTSTAT)
3249 show_shortstats(&diffstat, options);
3250 free_diffstat_info(&diffstat);
3251 separator++;
3252 }
3253 if (output_format & DIFF_FORMAT_DIRSTAT)
3254 show_dirstat(options);
3255
3256 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3257 for (i = 0; i < q->nr; i++)
3258 diff_summary(options->file, q->queue[i]);
3259 separator++;
3260 }
3261
3262 if (output_format & DIFF_FORMAT_PATCH) {
3263 if (separator) {
3264 putc(options->line_termination, options->file);
3265 if (options->stat_sep) {
3266 /* attach patch instead of inline */
3267 fputs(options->stat_sep, options->file);
3268 }
3269 }
3270
3271 for (i = 0; i < q->nr; i++) {
3272 struct diff_filepair *p = q->queue[i];
3273 if (check_pair_status(p))
3274 diff_flush_patch(p, options);
3275 }
3276 }
3277
3278 if (output_format & DIFF_FORMAT_CALLBACK)
3279 options->format_callback(q, options, options->format_callback_data);
3280
3281 for (i = 0; i < q->nr; i++)
3282 diff_free_filepair(q->queue[i]);
3283 free_queue:
3284 free(q->queue);
3285 q->queue = NULL;
3286 q->nr = q->alloc = 0;
3287 if (options->close_file)
3288 fclose(options->file);
3289 }
3290
3291 static void diffcore_apply_filter(const char *filter)
3292 {
3293 int i;
3294 struct diff_queue_struct *q = &diff_queued_diff;
3295 struct diff_queue_struct outq;
3296 outq.queue = NULL;
3297 outq.nr = outq.alloc = 0;
3298
3299 if (!filter)
3300 return;
3301
3302 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3303 int found;
3304 for (i = found = 0; !found && i < q->nr; i++) {
3305 struct diff_filepair *p = q->queue[i];
3306 if (((p->status == DIFF_STATUS_MODIFIED) &&
3307 ((p->score &&
3308 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3309 (!p->score &&
3310 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3311 ((p->status != DIFF_STATUS_MODIFIED) &&
3312 strchr(filter, p->status)))
3313 found++;
3314 }
3315 if (found)
3316 return;
3317
3318 /* otherwise we will clear the whole queue
3319 * by copying the empty outq at the end of this
3320 * function, but first clear the current entries
3321 * in the queue.
3322 */
3323 for (i = 0; i < q->nr; i++)
3324 diff_free_filepair(q->queue[i]);
3325 }
3326 else {
3327 /* Only the matching ones */
3328 for (i = 0; i < q->nr; i++) {
3329 struct diff_filepair *p = q->queue[i];
3330
3331 if (((p->status == DIFF_STATUS_MODIFIED) &&
3332 ((p->score &&
3333 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3334 (!p->score &&
3335 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3336 ((p->status != DIFF_STATUS_MODIFIED) &&
3337 strchr(filter, p->status)))
3338 diff_q(&outq, p);
3339 else
3340 diff_free_filepair(p);
3341 }
3342 }
3343 free(q->queue);
3344 *q = outq;
3345 }
3346
3347 /* Check whether two filespecs with the same mode and size are identical */
3348 static int diff_filespec_is_identical(struct diff_filespec *one,
3349 struct diff_filespec *two)
3350 {
3351 if (S_ISGITLINK(one->mode))
3352 return 0;
3353 if (diff_populate_filespec(one, 0))
3354 return 0;
3355 if (diff_populate_filespec(two, 0))
3356 return 0;
3357 return !memcmp(one->data, two->data, one->size);
3358 }
3359
3360 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3361 {
3362 int i;
3363 struct diff_queue_struct *q = &diff_queued_diff;
3364 struct diff_queue_struct outq;
3365 outq.queue = NULL;
3366 outq.nr = outq.alloc = 0;
3367
3368 for (i = 0; i < q->nr; i++) {
3369 struct diff_filepair *p = q->queue[i];
3370
3371 /*
3372 * 1. Entries that come from stat info dirtyness
3373 * always have both sides (iow, not create/delete),
3374 * one side of the object name is unknown, with
3375 * the same mode and size. Keep the ones that
3376 * do not match these criteria. They have real
3377 * differences.
3378 *
3379 * 2. At this point, the file is known to be modified,
3380 * with the same mode and size, and the object
3381 * name of one side is unknown. Need to inspect
3382 * the identical contents.
3383 */
3384 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3385 !DIFF_FILE_VALID(p->two) ||
3386 (p->one->sha1_valid && p->two->sha1_valid) ||
3387 (p->one->mode != p->two->mode) ||
3388 diff_populate_filespec(p->one, 1) ||
3389 diff_populate_filespec(p->two, 1) ||
3390 (p->one->size != p->two->size) ||
3391 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3392 diff_q(&outq, p);
3393 else {
3394 /*
3395 * The caller can subtract 1 from skip_stat_unmatch
3396 * to determine how many paths were dirty only
3397 * due to stat info mismatch.
3398 */
3399 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3400 diffopt->skip_stat_unmatch++;
3401 diff_free_filepair(p);
3402 }
3403 }
3404 free(q->queue);
3405 *q = outq;
3406 }
3407
3408 void diffcore_std(struct diff_options *options)
3409 {
3410 if (options->skip_stat_unmatch)
3411 diffcore_skip_stat_unmatch(options);
3412 if (options->break_opt != -1)
3413 diffcore_break(options->break_opt);
3414 if (options->detect_rename)
3415 diffcore_rename(options);
3416 if (options->break_opt != -1)
3417 diffcore_merge_broken();
3418 if (options->pickaxe)
3419 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3420 if (options->orderfile)
3421 diffcore_order(options->orderfile);
3422 diff_resolve_rename_copy();
3423 diffcore_apply_filter(options->filter);
3424
3425 if (diff_queued_diff.nr)
3426 DIFF_OPT_SET(options, HAS_CHANGES);
3427 else
3428 DIFF_OPT_CLR(options, HAS_CHANGES);
3429 }
3430
3431 int diff_result_code(struct diff_options *opt, int status)
3432 {
3433 int result = 0;
3434 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3435 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3436 return status;
3437 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3438 DIFF_OPT_TST(opt, HAS_CHANGES))
3439 result |= 01;
3440 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3441 DIFF_OPT_TST(opt, CHECK_FAILED))
3442 result |= 02;
3443 return result;
3444 }
3445
3446 void diff_addremove(struct diff_options *options,
3447 int addremove, unsigned mode,
3448 const unsigned char *sha1,
3449 const char *concatpath)
3450 {
3451 struct diff_filespec *one, *two;
3452
3453 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3454 return;
3455
3456 /* This may look odd, but it is a preparation for
3457 * feeding "there are unchanged files which should
3458 * not produce diffs, but when you are doing copy
3459 * detection you would need them, so here they are"
3460 * entries to the diff-core. They will be prefixed
3461 * with something like '=' or '*' (I haven't decided
3462 * which but should not make any difference).
3463 * Feeding the same new and old to diff_change()
3464 * also has the same effect.
3465 * Before the final output happens, they are pruned after
3466 * merged into rename/copy pairs as appropriate.
3467 */
3468 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3469 addremove = (addremove == '+' ? '-' :
3470 addremove == '-' ? '+' : addremove);
3471
3472 if (options->prefix &&
3473 strncmp(concatpath, options->prefix, options->prefix_length))
3474 return;
3475
3476 one = alloc_filespec(concatpath);
3477 two = alloc_filespec(concatpath);
3478
3479 if (addremove != '+')
3480 fill_filespec(one, sha1, mode);
3481 if (addremove != '-')
3482 fill_filespec(two, sha1, mode);
3483
3484 diff_queue(&diff_queued_diff, one, two);
3485 DIFF_OPT_SET(options, HAS_CHANGES);
3486 }
3487
3488 void diff_change(struct diff_options *options,
3489 unsigned old_mode, unsigned new_mode,
3490 const unsigned char *old_sha1,
3491 const unsigned char *new_sha1,
3492 const char *concatpath)
3493 {
3494 struct diff_filespec *one, *two;
3495
3496 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3497 && S_ISGITLINK(new_mode))
3498 return;
3499
3500 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3501 unsigned tmp;
3502 const unsigned char *tmp_c;
3503 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3504 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3505 }
3506
3507 if (options->prefix &&
3508 strncmp(concatpath, options->prefix, options->prefix_length))
3509 return;
3510
3511 one = alloc_filespec(concatpath);
3512 two = alloc_filespec(concatpath);
3513 fill_filespec(one, old_sha1, old_mode);
3514 fill_filespec(two, new_sha1, new_mode);
3515
3516 diff_queue(&diff_queued_diff, one, two);
3517 DIFF_OPT_SET(options, HAS_CHANGES);
3518 }
3519
3520 void diff_unmerge(struct diff_options *options,
3521 const char *path,
3522 unsigned mode, const unsigned char *sha1)
3523 {
3524 struct diff_filespec *one, *two;
3525
3526 if (options->prefix &&
3527 strncmp(path, options->prefix, options->prefix_length))
3528 return;
3529
3530 one = alloc_filespec(path);
3531 two = alloc_filespec(path);
3532 fill_filespec(one, sha1, mode);
3533 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3534 }