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