git_object_dup: introduce typesafe versions

include/git2/blob.h

@@ -259,6 +259,15 @@ GIT_EXTERN(int) git_blob_create_frombuffer(
  */
 GIT_EXTERN(int) git_blob_is_binary(const git_blob *blob);
 
+/**
+ * Create an in-memory copy of a blob. The copy must be explicitly
+ * free'd or it will leak.
+ *
+ * @param out Pointer to store the copy of the object
+ * @param source Original object to copy
+ */
+GIT_EXTERN(int) git_blob_dup(git_blob **out, git_blob *source);
+
 /** @} */
 GIT_END_DECL
 #endif

include/git2/commit.h

@@ -461,6 +461,15 @@ GIT_EXTERN(int) git_commit_create_with_signature(
 	const char *signature,
 	const char *signature_field);
 
+/**
+ * Create an in-memory copy of a commit. The copy must be explicitly
+ * free'd or it will leak.
+ *
+ * @param out Pointer to store the copy of the commit
+ * @param source Original commit to copy
+ */
+GIT_EXTERN(int) git_commit_dup(git_commit **out, git_commit *source);
+
 /** @} */
 GIT_END_DECL
 #endif

include/git2/tag.h

@@ -347,6 +347,15 @@ GIT_EXTERN(int) git_tag_peel(
 	git_object **tag_target_out,
 	const git_tag *tag);
 
+/**
+ * Create an in-memory copy of a tag. The copy must be explicitly
+ * free'd or it will leak.
+ *
+ * @param out Pointer to store the copy of the tag
+ * @param source Original tag to copy
+ */
+GIT_EXTERN(int) git_tag_dup(git_tag **out, git_tag *source);
+
 /** @} */
 GIT_END_DECL
 #endif

include/git2/tree.h

@@ -409,6 +409,15 @@ GIT_EXTERN(int) git_tree_walk(
 	git_treewalk_cb callback,
 	void *payload);
 
+/**
+ * Create an in-memory copy of a tree. The copy must be explicitly
+ * free'd or it will leak.
+ *
+ * @param out Pointer to store the copy of the tree
+ * @param source Original tree to copy
+ */
+GIT_EXTERN(int) git_tree_dup(git_tree **out, git_tree *source);
+
 /** @} */
 
 GIT_END_DECL

src/commit.c

@@ -615,7 +615,7 @@ int git_commit_nth_gen_ancestor(
 
 	assert(ancestor && commit);
 
-	if (git_object_dup((git_object **) &current, (git_object *) commit) < 0)
+	if (git_commit_dup(&current, (git_commit *)commit) < 0)
 		return -1;
 
 	if (n == 0) {

src/describe.c

@@ -197,7 +197,7 @@ static int commit_name_dup(struct commit_name **out, struct commit_name *in)
 	name->tag = NULL;
 	name->path = NULL;
 
-	if (in->tag && git_object_dup((git_object **) &name->tag, (git_object *) in->tag) < 0)
+	if (in->tag && git_tag_dup(&name->tag, in->tag) < 0)
 		return -1;
 
 	name->path = git__strdup(in->path);

src/iterator.c

@@ -820,7 +820,7 @@ int git_iterator_for_tree(
 	if (tree == NULL)
 		return git_iterator_for_nothing(iter, options);
 
-	if ((error = git_object_dup((git_object **)&tree, (git_object *)tree)) < 0)
+	if ((error = git_tree_dup(&tree, tree)) < 0)
 		return error;
 
 	ti = git__calloc(1, sizeof(tree_iterator));
@@ -1849,7 +1849,7 @@ int git_iterator_for_workdir_ext(
 		return error;
 	}
 
-	if (tree && (error = git_object_dup((git_object **)&wi->tree, (git_object *)tree)) < 0)
+	if (tree && (error = git_tree_dup(&wi->tree, tree)) < 0)
 		return error;
 
 	wi->index = index;

src/object_api.c

@@ -15,7 +15,7 @@
 #include "tag.h"
 
 /**
- * Blob
+ * Commit
  */
 int git_commit_lookup(git_commit **out, git_repository *repo, const git_oid *id)
 {
@@ -42,6 +42,10 @@ git_repository *git_commit_owner(const git_commit *obj)
 	return git_object_owner((const git_object *)obj);
 }
 
+int git_commit_dup(git_commit **out, git_commit *obj)
+{
+	return git_object_dup((git_object **)out, (git_object *)obj);
+}
 
 /**
  * Tree
@@ -71,6 +75,10 @@ git_repository *git_tree_owner(const git_tree *obj)
 	return git_object_owner((const git_object *)obj);
 }
 
+int git_tree_dup(git_tree **out, git_tree *obj)
+{
+	return git_object_dup((git_object **)out, (git_object *)obj);
+}
 
 /**
  * Tag
@@ -100,6 +108,11 @@ git_repository *git_tag_owner(const git_tag *obj)
 	return git_object_owner((const git_object *)obj);
 }
 
+int git_tag_dup(git_tag **out, git_tag *obj)
+{
+	return git_object_dup((git_object **)out, (git_object *)obj);
+}
+
 /**
  * Blob
  */
@@ -127,3 +140,8 @@ git_repository *git_blob_owner(const git_blob *obj)
 {
 	return git_object_owner((const git_object *)obj);
 }
+
+int git_blob_dup(git_blob **out, git_blob *obj)
+{
+	return git_object_dup((git_object **)out, (git_object *)obj);
+}