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-rw-r--r--tree-walk.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/tree-walk.c b/tree-walk.c
index bf8bfdfdf8..9f7abb7cb3 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -115,3 +115,53 @@ void traverse_trees(int n, struct tree_desc *t, const char *base, traverse_callb
free(entry);
}
+static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char *result, unsigned *mode)
+{
+ int namelen = strlen(name);
+ while (t->size) {
+ const char *entry;
+ const unsigned char *sha1;
+ int entrylen, cmp;
+
+ sha1 = tree_entry_extract(t, &entry, mode);
+ update_tree_entry(t);
+ entrylen = strlen(entry);
+ if (entrylen > namelen)
+ continue;
+ cmp = memcmp(name, entry, entrylen);
+ if (cmp > 0)
+ continue;
+ if (cmp < 0)
+ break;
+ if (entrylen == namelen) {
+ memcpy(result, sha1, 20);
+ return 0;
+ }
+ if (name[entrylen] != '/')
+ continue;
+ if (!S_ISDIR(*mode))
+ break;
+ if (++entrylen == namelen) {
+ memcpy(result, sha1, 20);
+ return 0;
+ }
+ return get_tree_entry(sha1, name + entrylen, result, mode);
+ }
+ return -1;
+}
+
+int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned char *sha1, unsigned *mode)
+{
+ int retval;
+ void *tree;
+ struct tree_desc t;
+
+ tree = read_object_with_reference(tree_sha1, tree_type, &t.size, NULL);
+ if (!tree)
+ return -1;
+ t.buf = tree;
+ retval = find_tree_entry(&t, name, sha1, mode);
+ free(tree);
+ return retval;
+}
+