1#include "cache.h"
2#include "tag.h"
3#include "commit.h"
4#include "tree.h"
5#include "blob.h"
6#include "tree-walk.h"
7#include "refs.h"
8static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
10{
11 struct alternate_object_database *alt;
12 char hex[40];
13 int found = 0;
14 static struct alternate_object_database *fakeent;
15 if (!fakeent) {
17 const char *objdir = get_object_directory();
18 int objdir_len = strlen(objdir);
19 int entlen = objdir_len + 43;
20 fakeent = xmalloc(sizeof(*fakeent) + entlen);
21 memcpy(fakeent->base, objdir, objdir_len);
22 fakeent->name = fakeent->base + objdir_len + 1;
23 fakeent->name[-1] = '/';
24 }
25 fakeent->next = alt_odb_list;
26 sprintf(hex, "%.2s", name);
28 for (alt = fakeent; alt && found < 2; alt = alt->next) {
29 struct dirent *de;
30 DIR *dir;
31 sprintf(alt->name, "%.2s/", name);
32 dir = opendir(alt->base);
33 if (!dir)
34 continue;
35 while ((de = readdir(dir)) != NULL) {
36 if (strlen(de->d_name) != 38)
37 continue;
38 if (memcmp(de->d_name, name + 2, len - 2))
39 continue;
40 if (!found) {
41 memcpy(hex + 2, de->d_name, 38);
42 found++;
43 }
44 else if (memcmp(hex + 2, de->d_name, 38)) {
45 found = 2;
46 break;
47 }
48 }
49 closedir(dir);
50 }
51 if (found == 1)
52 return get_sha1_hex(hex, sha1) == 0;
53 return found;
54}
55static int match_sha(unsigned len, const unsigned char *a, const unsigned char *b)
57{
58 do {
59 if (*a != *b)
60 return 0;
61 a++;
62 b++;
63 len -= 2;
64 } while (len > 1);
65 if (len)
66 if ((*a ^ *b) & 0xf0)
67 return 0;
68 return 1;
69}
70static int find_short_packed_object(int len, const unsigned char *match, unsigned char *sha1)
72{
73 struct packed_git *p;
74 const unsigned char *found_sha1 = NULL;
75 int found = 0;
76 prepare_packed_git();
78 for (p = packed_git; p && found < 2; p = p->next) {
79 uint32_t num, last;
80 uint32_t first = 0;
81 open_pack_index(p);
82 num = p->num_objects;
83 last = num;
84 while (first < last) {
85 uint32_t mid = (first + last) / 2;
86 const unsigned char *now;
87 int cmp;
88 now = nth_packed_object_sha1(p, mid);
90 cmp = hashcmp(match, now);
91 if (!cmp) {
92 first = mid;
93 break;
94 }
95 if (cmp > 0) {
96 first = mid+1;
97 continue;
98 }
99 last = mid;
100 }
101 if (first < num) {
102 const unsigned char *now, *next;
103 now = nth_packed_object_sha1(p, first);
104 if (match_sha(len, match, now)) {
105 next = nth_packed_object_sha1(p, first+1);
106 if (!next|| !match_sha(len, match, next)) {
107 /* unique within this pack */
108 if (!found) {
109 found_sha1 = now;
110 found++;
111 }
112 else if (hashcmp(found_sha1, now)) {
113 found = 2;
114 break;
115 }
116 }
117 else {
118 /* not even unique within this pack */
119 found = 2;
120 break;
121 }
122 }
123 }
124 }
125 if (found == 1)
126 hashcpy(sha1, found_sha1);
127 return found;
128}
129#define SHORT_NAME_NOT_FOUND (-1)
131#define SHORT_NAME_AMBIGUOUS (-2)
132static int find_unique_short_object(int len, char *canonical,
134 unsigned char *res, unsigned char *sha1)
135{
136 int has_unpacked, has_packed;
137 unsigned char unpacked_sha1[20], packed_sha1[20];
138 prepare_alt_odb();
140 has_unpacked = find_short_object_filename(len, canonical, unpacked_sha1);
141 has_packed = find_short_packed_object(len, res, packed_sha1);
142 if (!has_unpacked && !has_packed)
143 return SHORT_NAME_NOT_FOUND;
144 if (1 < has_unpacked || 1 < has_packed)
145 return SHORT_NAME_AMBIGUOUS;
146 if (has_unpacked != has_packed) {
147 hashcpy(sha1, (has_packed ? packed_sha1 : unpacked_sha1));
148 return 0;
149 }
150 /* Both have unique ones -- do they match? */
151 if (hashcmp(packed_sha1, unpacked_sha1))
152 return SHORT_NAME_AMBIGUOUS;
153 hashcpy(sha1, packed_sha1);
154 return 0;
155}
156static int get_short_sha1(const char *name, int len, unsigned char *sha1,
158 int quietly)
159{
160 int i, status;
161 char canonical[40];
162 unsigned char res[20];
163 if (len < MINIMUM_ABBREV || len > 40)
165 return -1;
166 hashclr(res);
167 memset(canonical, 'x', 40);
168 for (i = 0; i < len ;i++) {
169 unsigned char c = name[i];
170 unsigned char val;
171 if (c >= '0' && c <= '9')
172 val = c - '0';
173 else if (c >= 'a' && c <= 'f')
174 val = c - 'a' + 10;
175 else if (c >= 'A' && c <='F') {
176 val = c - 'A' + 10;
177 c -= 'A' - 'a';
178 }
179 else
180 return -1;
181 canonical[i] = c;
182 if (!(i & 1))
183 val <<= 4;
184 res[i >> 1] |= val;
185 }
186 status = find_unique_short_object(i, canonical, res, sha1);
188 if (!quietly && (status == SHORT_NAME_AMBIGUOUS))
189 return error("short SHA1 %.*s is ambiguous.", len, canonical);
190 return status;
191}
192const char *find_unique_abbrev(const unsigned char *sha1, int len)
194{
195 int status, exists;
196 static char hex[41];
197 exists = has_sha1_file(sha1);
199 memcpy(hex, sha1_to_hex(sha1), 40);
200 if (len == 40 || !len)
201 return hex;
202 while (len < 40) {
203 unsigned char sha1_ret[20];
204 status = get_short_sha1(hex, len, sha1_ret, 1);
205 if (exists
206 ? !status
207 : status == SHORT_NAME_NOT_FOUND) {
208 hex[len] = 0;
209 return hex;
210 }
211 len++;
212 }
213 return hex;
214}
215static int ambiguous_path(const char *path, int len)
217{
218 int slash = 1;
219 int cnt;
220 for (cnt = 0; cnt < len; cnt++) {
222 switch (*path++) {
223 case '\0':
224 break;
225 case '/':
226 if (slash)
227 break;
228 slash = 1;
229 continue;
230 case '.':
231 continue;
232 default:
233 slash = 0;
234 continue;
235 }
236 break;
237 }
238 return slash;
239}
240/*
242 * *string and *len will only be substituted, and *string returned (for
243 * later free()ing) if the string passed in is of the form @{-<n>}.
244 */
245static char *substitute_branch_name(const char **string, int *len)
246{
247 struct strbuf buf = STRBUF_INIT;
248 int ret = interpret_branch_name(*string, &buf);
249 if (ret == *len) {
251 size_t size;
252 *string = strbuf_detach(&buf, &size);
253 *len = size;
254 return (char *)*string;
255 }
256 return NULL;
258}
259int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
261{
262 char *last_branch = substitute_branch_name(&str, &len);
263 const char **p, *r;
264 int refs_found = 0;
265 *ref = NULL;
267 for (p = ref_rev_parse_rules; *p; p++) {
268 char fullref[PATH_MAX];
269 unsigned char sha1_from_ref[20];
270 unsigned char *this_result;
271 int flag;
272 this_result = refs_found ? sha1_from_ref : sha1;
274 mksnpath(fullref, sizeof(fullref), *p, len, str);
275 r = resolve_ref(fullref, this_result, 1, &flag);
276 if (r) {
277 if (!refs_found++)
278 *ref = xstrdup(r);
279 if (!warn_ambiguous_refs)
280 break;
281 } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD"))
282 warning("ignoring dangling symref %s.", fullref);
283 }
284 free(last_branch);
285 return refs_found;
286}
287int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
289{
290 char *last_branch = substitute_branch_name(&str, &len);
291 const char **p;
292 int logs_found = 0;
293 *log = NULL;
295 for (p = ref_rev_parse_rules; *p; p++) {
296 struct stat st;
297 unsigned char hash[20];
298 char path[PATH_MAX];
299 const char *ref, *it;
300 mksnpath(path, sizeof(path), *p, len, str);
302 ref = resolve_ref(path, hash, 1, NULL);
303 if (!ref)
304 continue;
305 if (!stat(git_path("logs/%s", path), &st) &&
306 S_ISREG(st.st_mode))
307 it = path;
308 else if (strcmp(ref, path) &&
309 !stat(git_path("logs/%s", ref), &st) &&
310 S_ISREG(st.st_mode))
311 it = ref;
312 else
313 continue;
314 if (!logs_found++) {
315 *log = xstrdup(it);
316 hashcpy(sha1, hash);
317 }
318 if (!warn_ambiguous_refs)
319 break;
320 }
321 free(last_branch);
322 return logs_found;
323}
324static int get_sha1_1(const char *name, int len, unsigned char *sha1);
326static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
328{
329 static const char *warning = "warning: refname '%.*s' is ambiguous.\n";
330 char *real_ref = NULL;
331 int refs_found = 0;
332 int at, reflog_len;
333 if (len == 40 && !get_sha1_hex(str, sha1))
335 return 0;
336 /* basic@{time or number or -number} format to query ref-log */
338 reflog_len = at = 0;
339 if (len && str[len-1] == '}') {
340 for (at = len-2; at >= 0; at--) {
341 if (str[at] == '@' && str[at+1] == '{') {
342 reflog_len = (len-1) - (at+2);
343 len = at;
344 break;
345 }
346 }
347 }
348 /* Accept only unambiguous ref paths. */
350 if (len && ambiguous_path(str, len))
351 return -1;
352 if (!len && reflog_len) {
354 struct strbuf buf = STRBUF_INIT;
355 int ret;
356 /* try the @{-N} syntax for n-th checkout */
357 ret = interpret_branch_name(str+at, &buf);
358 if (ret > 0) {
359 /* substitute this branch name and restart */
360 return get_sha1_1(buf.buf, buf.len, sha1);
361 } else if (ret == 0) {
362 return -1;
363 }
364 /* allow "@{...}" to mean the current branch reflog */
365 refs_found = dwim_ref("HEAD", 4, sha1, &real_ref);
366 } else if (reflog_len)
367 refs_found = dwim_log(str, len, sha1, &real_ref);
368 else
369 refs_found = dwim_ref(str, len, sha1, &real_ref);
370 if (!refs_found)
372 return -1;
373 if (warn_ambiguous_refs && refs_found > 1)
375 fprintf(stderr, warning, len, str);
376 if (reflog_len) {
378 int nth, i;
379 unsigned long at_time;
380 unsigned long co_time;
381 int co_tz, co_cnt;
382 /* Is it asking for N-th entry, or approxidate? */
384 for (i = nth = 0; 0 <= nth && i < reflog_len; i++) {
385 char ch = str[at+2+i];
386 if ('0' <= ch && ch <= '9')
387 nth = nth * 10 + ch - '0';
388 else
389 nth = -1;
390 }
391 if (100000000 <= nth) {
392 at_time = nth;
393 nth = -1;
394 } else if (0 <= nth)
395 at_time = 0;
396 else {
397 char *tmp = xstrndup(str + at + 2, reflog_len);
398 at_time = approxidate(tmp);
399 free(tmp);
400 }
401 if (read_ref_at(real_ref, at_time, nth, sha1, NULL,
402 &co_time, &co_tz, &co_cnt)) {
403 if (at_time)
404 fprintf(stderr,
405 "warning: Log for '%.*s' only goes "
406 "back to %s.\n", len, str,
407 show_date(co_time, co_tz, DATE_RFC2822));
408 else
409 fprintf(stderr,
410 "warning: Log for '%.*s' only has "
411 "%d entries.\n", len, str, co_cnt);
412 }
413 }
414 free(real_ref);
416 return 0;
417}
418static int get_parent(const char *name, int len,
420 unsigned char *result, int idx)
421{
422 unsigned char sha1[20];
423 int ret = get_sha1_1(name, len, sha1);
424 struct commit *commit;
425 struct commit_list *p;
426 if (ret)
428 return ret;
429 commit = lookup_commit_reference(sha1);
430 if (!commit)
431 return -1;
432 if (parse_commit(commit))
433 return -1;
434 if (!idx) {
435 hashcpy(result, commit->object.sha1);
436 return 0;
437 }
438 p = commit->parents;
439 while (p) {
440 if (!--idx) {
441 hashcpy(result, p->item->object.sha1);
442 return 0;
443 }
444 p = p->next;
445 }
446 return -1;
447}
448static int get_nth_ancestor(const char *name, int len,
450 unsigned char *result, int generation)
451{
452 unsigned char sha1[20];
453 struct commit *commit;
454 int ret;
455 ret = get_sha1_1(name, len, sha1);
457 if (ret)
458 return ret;
459 commit = lookup_commit_reference(sha1);
460 if (!commit)
461 return -1;
462 while (generation--) {
464 if (parse_commit(commit) || !commit->parents)
465 return -1;
466 commit = commit->parents->item;
467 }
468 hashcpy(result, commit->object.sha1);
469 return 0;
470}
471struct object *peel_to_type(const char *name, int namelen,
473 struct object *o, enum object_type expected_type)
474{
475 if (name && !namelen)
476 namelen = strlen(name);
477 if (!o) {
478 unsigned char sha1[20];
479 if (get_sha1_1(name, namelen, sha1))
480 return NULL;
481 o = parse_object(sha1);
482 }
483 while (1) {
484 if (!o || (!o->parsed && !parse_object(o->sha1)))
485 return NULL;
486 if (o->type == expected_type)
487 return o;
488 if (o->type == OBJ_TAG)
489 o = ((struct tag*) o)->tagged;
490 else if (o->type == OBJ_COMMIT)
491 o = &(((struct commit *) o)->tree->object);
492 else {
493 if (name)
494 error("%.*s: expected %s type, but the object "
495 "dereferences to %s type",
496 namelen, name, typename(expected_type),
497 typename(o->type));
498 return NULL;
499 }
500 }
501}
502static int peel_onion(const char *name, int len, unsigned char *sha1)
504{
505 unsigned char outer[20];
506 const char *sp;
507 unsigned int expected_type = 0;
508 struct object *o;
509 /*
511 * "ref^{type}" dereferences ref repeatedly until you cannot
512 * dereference anymore, or you get an object of given type,
513 * whichever comes first. "ref^{}" means just dereference
514 * tags until you get a non-tag. "ref^0" is a shorthand for
515 * "ref^{commit}". "commit^{tree}" could be used to find the
516 * top-level tree of the given commit.
517 */
518 if (len < 4 || name[len-1] != '}')
519 return -1;
520 for (sp = name + len - 1; name <= sp; sp--) {
522 int ch = *sp;
523 if (ch == '{' && name < sp && sp[-1] == '^')
524 break;
525 }
526 if (sp <= name)
527 return -1;
528 sp++; /* beginning of type name, or closing brace for empty */
530 if (!strncmp(commit_type, sp, 6) && sp[6] == '}')
531 expected_type = OBJ_COMMIT;
532 else if (!strncmp(tree_type, sp, 4) && sp[4] == '}')
533 expected_type = OBJ_TREE;
534 else if (!strncmp(blob_type, sp, 4) && sp[4] == '}')
535 expected_type = OBJ_BLOB;
536 else if (sp[0] == '}')
537 expected_type = OBJ_NONE;
538 else
539 return -1;
540 if (get_sha1_1(name, sp - name - 2, outer))
542 return -1;
543 o = parse_object(outer);
545 if (!o)
546 return -1;
547 if (!expected_type) {
548 o = deref_tag(o, name, sp - name - 2);
549 if (!o || (!o->parsed && !parse_object(o->sha1)))
550 return -1;
551 hashcpy(sha1, o->sha1);
552 }
553 else {
554 /*
555 * At this point, the syntax look correct, so
556 * if we do not get the needed object, we should
557 * barf.
558 */
559 o = peel_to_type(name, len, o, expected_type);
560 if (o) {
561 hashcpy(sha1, o->sha1);
562 return 0;
563 }
564 return -1;
565 }
566 return 0;
567}
568static int get_describe_name(const char *name, int len, unsigned char *sha1)
570{
571 const char *cp;
572 for (cp = name + len - 1; name + 2 <= cp; cp--) {
574 char ch = *cp;
575 if (hexval(ch) & ~0377) {
576 /* We must be looking at g in "SOMETHING-g"
577 * for it to be describe output.
578 */
579 if (ch == 'g' && cp[-1] == '-') {
580 cp++;
581 len -= cp - name;
582 return get_short_sha1(cp, len, sha1, 1);
583 }
584 }
585 }
586 return -1;
587}
588static int get_sha1_1(const char *name, int len, unsigned char *sha1)
590{
591 int ret, has_suffix;
592 const char *cp;
593 /*
595 * "name~3" is "name^^^", "name~" is "name~1", and "name^" is "name^1".
596 */
597 has_suffix = 0;
598 for (cp = name + len - 1; name <= cp; cp--) {
599 int ch = *cp;
600 if ('0' <= ch && ch <= '9')
601 continue;
602 if (ch == '~' || ch == '^')
603 has_suffix = ch;
604 break;
605 }
606 if (has_suffix) {
608 int num = 0;
609 int len1 = cp - name;
610 cp++;
611 while (cp < name + len)
612 num = num * 10 + *cp++ - '0';
613 if (!num && len1 == len - 1)
614 num = 1;
615 if (has_suffix == '^')
616 return get_parent(name, len1, sha1, num);
617 /* else if (has_suffix == '~') -- goes without saying */
618 return get_nth_ancestor(name, len1, sha1, num);
619 }
620 ret = peel_onion(name, len, sha1);
622 if (!ret)
623 return 0;
624 ret = get_sha1_basic(name, len, sha1);
626 if (!ret)
627 return 0;
628 /* It could be describe output that is "SOMETHING-gXXXX" */
630 ret = get_describe_name(name, len, sha1);
631 if (!ret)
632 return 0;
633 return get_short_sha1(name, len, sha1, 0);
635}
636static int handle_one_ref(const char *path,
638 const unsigned char *sha1, int flag, void *cb_data)
639{
640 struct commit_list **list = cb_data;
641 struct object *object = parse_object(sha1);
642 if (!object)
643 return 0;
644 if (object->type == OBJ_TAG) {
645 object = deref_tag(object, path, strlen(path));
646 if (!object)
647 return 0;
648 }
649 if (object->type != OBJ_COMMIT)
650 return 0;
651 insert_by_date((struct commit *)object, list);
652 return 0;
653}
654/*
656 * This interprets names like ':/Initial revision of "git"' by searching
657 * through history and returning the first commit whose message starts
658 * with the given string.
659 *
660 * For future extension, ':/!' is reserved. If you want to match a message
661 * beginning with a '!', you have to repeat the exclamation mark.
662 */
663#define ONELINE_SEEN (1u<<20)
665static int get_sha1_oneline(const char *prefix, unsigned char *sha1)
666{
667 struct commit_list *list = NULL, *backup = NULL, *l;
668 int retval = -1;
669 char *temp_commit_buffer = NULL;
670 if (prefix[0] == '!') {
672 if (prefix[1] != '!')
673 die ("Invalid search pattern: %s", prefix);
674 prefix++;
675 }
676 for_each_ref(handle_one_ref, &list);
677 for (l = list; l; l = l->next)
678 commit_list_insert(l->item, &backup);
679 while (list) {
680 char *p;
681 struct commit *commit;
682 enum object_type type;
683 unsigned long size;
684 commit = pop_most_recent_commit(&list, ONELINE_SEEN);
686 if (!parse_object(commit->object.sha1))
687 continue;
688 free(temp_commit_buffer);
689 if (commit->buffer)
690 p = commit->buffer;
691 else {
692 p = read_sha1_file(commit->object.sha1, &type, &size);
693 if (!p)
694 continue;
695 temp_commit_buffer = p;
696 }
697 if (!(p = strstr(p, "\n\n")))
698 continue;
699 if (!prefixcmp(p + 2, prefix)) {
700 hashcpy(sha1, commit->object.sha1);
701 retval = 0;
702 break;
703 }
704 }
705 free(temp_commit_buffer);
706 free_commit_list(list);
707 for (l = backup; l; l = l->next)
708 clear_commit_marks(l->item, ONELINE_SEEN);
709 return retval;
710}
711struct grab_nth_branch_switch_cbdata {
713 long cnt, alloc;
714 struct strbuf *buf;
715};
716static int grab_nth_branch_switch(unsigned char *osha1, unsigned char *nsha1,
718 const char *email, unsigned long timestamp, int tz,
719 const char *message, void *cb_data)
720{
721 struct grab_nth_branch_switch_cbdata *cb = cb_data;
722 const char *match = NULL, *target = NULL;
723 size_t len;
724 int nth;
725 if (!prefixcmp(message, "checkout: moving from ")) {
727 match = message + strlen("checkout: moving from ");
728 target = strstr(match, " to ");
729 }
730 if (!match || !target)
732 return 0;
733 len = target - match;
735 nth = cb->cnt++ % cb->alloc;
736 strbuf_reset(&cb->buf[nth]);
737 strbuf_add(&cb->buf[nth], match, len);
738 return 0;
739}
740/*
742 * This reads "@{-N}" syntax, finds the name of the Nth previous
743 * branch we were on, and places the name of the branch in the given
744 * buf and returns the number of characters parsed if successful.
745 *
746 * If the input is not of the accepted format, it returns a negative
747 * number to signal an error.
748 *
749 * If the input was ok but there are not N branch switches in the
750 * reflog, it returns 0.
751 */
752int interpret_branch_name(const char *name, struct strbuf *buf)
753{
754 long nth;
755 int i, retval;
756 struct grab_nth_branch_switch_cbdata cb;
757 const char *brace;
758 char *num_end;
759 if (name[0] != '@' || name[1] != '{' || name[2] != '-')
761 return -1;
762 brace = strchr(name, '}');
763 if (!brace)
764 return -1;
765 nth = strtol(name+3, &num_end, 10);
766 if (num_end != brace)
767 return -1;
768 if (nth <= 0)
769 return -1;
770 cb.alloc = nth;
771 cb.buf = xmalloc(nth * sizeof(struct strbuf));
772 for (i = 0; i < nth; i++)
773 strbuf_init(&cb.buf[i], 20);
774 cb.cnt = 0;
775 retval = 0;
776 for_each_recent_reflog_ent("HEAD", grab_nth_branch_switch, 40960, &cb);
777 if (cb.cnt < nth) {
778 cb.cnt = 0;
779 for_each_reflog_ent("HEAD", grab_nth_branch_switch, &cb);
780 }
781 if (cb.cnt < nth)
782 goto release_return;
783 i = cb.cnt % nth;
784 strbuf_reset(buf);
785 strbuf_add(buf, cb.buf[i].buf, cb.buf[i].len);
786 retval = brace-name+1;
787release_return:
789 for (i = 0; i < nth; i++)
790 strbuf_release(&cb.buf[i]);
791 free(cb.buf);
792 return retval;
794}
795/*
797 * This is like "get_sha1_basic()", except it allows "sha1 expressions",
798 * notably "xyz^" for "parent of xyz"
799 */
800int get_sha1(const char *name, unsigned char *sha1)
801{
802 unsigned unused;
803 return get_sha1_with_mode(name, sha1, &unused);
804}
805int get_sha1_with_mode(const char *name, unsigned char *sha1, unsigned *mode)
807{
808 int ret, bracket_depth;
809 int namelen = strlen(name);
810 const char *cp;
811 *mode = S_IFINVALID;
813 ret = get_sha1_1(name, namelen, sha1);
814 if (!ret)
815 return ret;
816 /* sha1:path --> object name of path in ent sha1
817 * :path -> object name of path in index
818 * :[0-3]:path -> object name of path in index at stage
819 */
820 if (name[0] == ':') {
821 int stage = 0;
822 struct cache_entry *ce;
823 int pos;
824 if (namelen > 2 && name[1] == '/')
825 return get_sha1_oneline(name + 2, sha1);
826 if (namelen < 3 ||
827 name[2] != ':' ||
828 name[1] < '0' || '3' < name[1])
829 cp = name + 1;
830 else {
831 stage = name[1] - '0';
832 cp = name + 3;
833 }
834 namelen = namelen - (cp - name);
835 if (!active_cache)
836 read_cache();
837 pos = cache_name_pos(cp, namelen);
838 if (pos < 0)
839 pos = -pos - 1;
840 while (pos < active_nr) {
841 ce = active_cache[pos];
842 if (ce_namelen(ce) != namelen ||
843 memcmp(ce->name, cp, namelen))
844 break;
845 if (ce_stage(ce) == stage) {
846 hashcpy(sha1, ce->sha1);
847 *mode = ce->ce_mode;
848 return 0;
849 }
850 pos++;
851 }
852 return -1;
853 }
854 for (cp = name, bracket_depth = 0; *cp; cp++) {
855 if (*cp == '{')
856 bracket_depth++;
857 else if (bracket_depth && *cp == '}')
858 bracket_depth--;
859 else if (!bracket_depth && *cp == ':')
860 break;
861 }
862 if (*cp == ':') {
863 unsigned char tree_sha1[20];
864 if (!get_sha1_1(name, cp-name, tree_sha1))
865 return get_tree_entry(tree_sha1, cp+1, sha1,
866 mode);
867 }
868 return ret;
869}