thodg/libgit2

diff --git a/include/git2/index.h b/include/git2/index.h
index ad6d197..9f9d144 100644
--- a/include/git2/index.h
+++ b/include/git2/index.h
@@ -403,11 +403,12 @@ GIT_EXTERN(int) git_index_remove_bypath(git_index *index, const char *path);
  * Find the first index of any entries which point to given
  * path in the Git index.
  *
+ * @param at_pos the address to which the position of the index entry is written (optional)
  * @param index an existing index object
  * @param path path to search
- * @return an index >= 0 if found, -1 otherwise
+ * @return 0 if found, < 0 otherwise (GIT_ENOTFOUND)
  */
-GIT_EXTERN(int) git_index_find(git_index *index, const char *path);
+GIT_EXTERN(int) git_index_find(size_t *at_pos, git_index *index, const char *path);
 
 /**@}*/
 
@@ -495,11 +496,12 @@ GIT_EXTERN(unsigned int) git_index_reuc_entrycount(git_index *index);
  * Finds the resolve undo entry that points to the given path in the Git
  * index.
  *
+ * @param at_pos the address to which the position of the reuc entry is written (optional)
  * @param index an existing index object
  * @param path path to search
- * @return an index >= 0 if found, -1 otherwise
+ * @return 0 if found, < 0 otherwise (GIT_ENOTFOUND)
  */
-GIT_EXTERN(int) git_index_reuc_find(git_index *index, const char *path);
+GIT_EXTERN(int) git_index_reuc_find(size_t *at_pos, git_index *index, const char *path);
 
 /**
  * Get a resolve undo entry from the index.
diff --git a/src/attr.c b/src/attr.c
index 1b41441..a1d9932 100644
--- a/src/attr.c
+++ b/src/attr.c
@@ -61,8 +61,9 @@ int git_attr_get(
 	git_vector_foreach(&files, i, file) {
 
 		git_attr_file__foreach_matching_rule(file, &path, j, rule) {
-			int pos = git_vector_bsearch(&rule->assigns, &attr);
-			if (pos >= 0) {
+			size_t pos;
+
+			if (!git_vector_bsearch(&pos, &rule->assigns, &attr)) {
 				*value = ((git_attr_assignment *)git_vector_get(
 							  &rule->assigns, pos))->value;
 				goto cleanup;
@@ -116,7 +117,7 @@ int git_attr_get_many(
 		git_attr_file__foreach_matching_rule(file, &path, j, rule) {
 
 			for (k = 0; k < num_attr; k++) {
-				int pos;
+				size_t pos;
 
 				if (info[k].found != NULL) /* already found assignment */
 					continue;
@@ -126,8 +127,7 @@ int git_attr_get_many(
 					info[k].name.name_hash = git_attr_file__name_hash(names[k]);
 				}
 
-				pos = git_vector_bsearch(&rule->assigns, &info[k].name);
-				if (pos >= 0) {
+				if (!git_vector_bsearch(&pos, &rule->assigns, &info[k].name)) {
 					info[k].found = (git_attr_assignment *)
 						git_vector_get(&rule->assigns, pos);
 					values[k] = info[k].found->value;
@@ -294,14 +294,15 @@ static int load_attr_blob_from_index(
 	const char *relfile)
 {
 	int error;
+	size_t pos;
 	git_index *index;
 	const git_index_entry *entry;
 
 	if ((error = git_repository_index__weakptr(&index, repo)) < 0 ||
-		(error = git_index_find(index, relfile)) < 0)
+		(error = git_index_find(&pos, index, relfile)) < 0)
 		return error;
 
-	entry = git_index_get_byindex(index, error);
+	entry = git_index_get_byindex(index, pos);
 
 	if (old_oid && git_oid_cmp(old_oid, &entry->oid) == 0)
 		return GIT_ENOTFOUND;
diff --git a/src/attr_file.c b/src/attr_file.c
index 485bcb4..628cb15 100644
--- a/src/attr_file.c
+++ b/src/attr_file.c
@@ -191,9 +191,9 @@ int git_attr_file__lookup_one(
 	name.name_hash = git_attr_file__name_hash(attr);
 
 	git_attr_file__foreach_matching_rule(file, path, i, rule) {
-		int pos = git_vector_bsearch(&rule->assigns, &name);
+		size_t pos;
 
-		if (pos >= 0) {
+		if (!git_vector_bsearch(&pos, &rule->assigns, &name)) {
 			*value = ((git_attr_assignment *)
 					  git_vector_get(&rule->assigns, pos))->value;
 			break;
@@ -240,14 +240,15 @@ bool git_attr_rule__match(
 git_attr_assignment *git_attr_rule__lookup_assignment(
 	git_attr_rule *rule, const char *name)
 {
-	int pos;
+	size_t pos;
 	git_attr_name key;
 	key.name = name;
 	key.name_hash = git_attr_file__name_hash(name);
 
-	pos = git_vector_bsearch(&rule->assigns, &key);
+	if (git_vector_bsearch(&pos, &rule->assigns, &key))
+		return NULL;
 
-	return (pos >= 0) ? git_vector_get(&rule->assigns, pos) : NULL;
+	return git_vector_get(&rule->assigns, pos);
 }
 
 int git_attr_path__init(
diff --git a/src/commit.c b/src/commit.c
index 2714f1a..29ce391 100644
--- a/src/commit.c
+++ b/src/commit.c
@@ -137,7 +137,8 @@ int git_commit__parse_buffer(git_commit *commit, const void *data, size_t len)
 	const char *buffer_end = (const char *)data + len;
 	git_oid parent_id;
 
-	git_vector_init(&commit->parent_ids, 4, NULL);
+	if (git_vector_init(&commit->parent_ids, 4, NULL) < 0)
+		return -1;
 
 	if (git_oid__parse(&commit->tree_id, &buffer, buffer_end, "tree ") < 0)
 		goto bad_buffer;
diff --git a/src/diff_tform.c b/src/diff_tform.c
index 873ec3a..2c2e1fb 100644
--- a/src/diff_tform.c
+++ b/src/diff_tform.c
@@ -250,22 +250,21 @@ static int apply_splits_and_deletes(git_diff_list *diff, size_t expected_size)
 
 	/* build new delta list without TO_DELETE and splitting TO_SPLIT */
 	git_vector_foreach(&diff->deltas, i, delta) {
-		if (delta->status == GIT_DELTA__TO_DELETE) {
-			git__free(delta);
+		if (delta->status == GIT_DELTA__TO_DELETE)
 			continue;
-		}
 
 		if (delta->status == GIT_DELTA__TO_SPLIT) {
 			git_diff_delta *deleted = diff_delta__dup(delta, &diff->pool);
 			if (!deleted)
-				return -1;
+				goto on_error;
 
 			deleted->status = GIT_DELTA_DELETED;
 			memset(&deleted->new_file, 0, sizeof(deleted->new_file));
 			deleted->new_file.path = deleted->old_file.path;
 			deleted->new_file.flags |= GIT_DIFF_FILE_VALID_OID;
 
-			git_vector_insert(&onto, deleted);
+			if (git_vector_insert(&onto, deleted) < 0)
+				goto on_error;
 
 			delta->status = GIT_DELTA_ADDED;
 			memset(&delta->old_file, 0, sizeof(delta->old_file));
@@ -273,15 +272,29 @@ static int apply_splits_and_deletes(git_diff_list *diff, size_t expected_size)
 			delta->old_file.flags |= GIT_DIFF_FILE_VALID_OID;
 		}
 
-		git_vector_insert(&onto, delta);
+		if (git_vector_insert(&onto, delta) < 0)
+			goto on_error;
 	}
 
+	/* cannot return an error past this point */
+	git_vector_foreach(&diff->deltas, i, delta)
+		if (delta->status == GIT_DELTA__TO_DELETE)
+			git__free(delta);
+
 	/* swap new delta list into place */
 	git_vector_sort(&onto);
 	git_vector_swap(&diff->deltas, &onto);
 	git_vector_free(&onto);
 
 	return 0;
+
+on_error:
+	git_vector_foreach(&onto, i, delta)
+		git__free(delta);
+
+	git_vector_free(&onto);
+
+	return -1;
 }
 
 static unsigned int calc_similarity(
diff --git a/src/index.c b/src/index.c
index e9dffab..1e00dd3 100644
--- a/src/index.c
+++ b/src/index.c
@@ -97,7 +97,7 @@ static int parse_index(git_index *index, const char *buffer, size_t buffer_size)
 static bool is_index_extended(git_index *index);
 static int write_index(git_index *index, git_filebuf *file);
 
-static int index_find(git_index *index, const char *path, int stage);
+static int index_find(size_t *at_pos, git_index *index, const char *path, int stage);
 
 static void index_entry_free(git_index_entry *entry);
 static void index_entry_reuc_free(git_index_reuc_entry *reuc);
@@ -504,13 +504,13 @@ const git_index_entry *git_index_get_byindex(
 const git_index_entry *git_index_get_bypath(
 	git_index *index, const char *path, int stage)
 {
-	int pos;
+	size_t pos;
 
 	assert(index);
 
 	git_vector_sort(&index->entries);
 
-	if((pos = index_find(index, path, stage)) < 0)
+	if (index_find(&pos, index, path, stage) < 0)
 		return NULL;
 
 	return git_index_get_byindex(index, pos);
@@ -665,8 +665,7 @@ static void index_entry_free(git_index_entry *entry)
 
 static int index_insert(git_index *index, git_index_entry *entry, int replace)
 {
-	size_t path_length;
-	int position;
+	size_t path_length, position;
 	git_index_entry **existing = NULL;
 
 	assert(index && entry && entry->path != NULL);
@@ -682,7 +681,7 @@ static int index_insert(git_index *index, git_index_entry *entry, int replace)
 		entry->flags |= GIT_IDXENTRY_NAMEMASK;
 
 	/* look if an entry with this path already exists */
-	if ((position = index_find(index, entry->path, index_entry_stage(entry))) >= 0) {
+	if (!index_find(&position, index, entry->path, index_entry_stage(entry))) {
 		existing = (git_index_entry **)&index->entries.contents[position];
 
 		/* update filemode to existing values if stat is not trusted */
@@ -787,14 +786,14 @@ int git_index_add(git_index *index, const git_index_entry *source_entry)
 
 int git_index_remove(git_index *index, const char *path, int stage)
 {
-	int position;
+	size_t position;
 	int error;
 	git_index_entry *entry;
 
 	git_vector_sort(&index->entries);
 
-	if ((position = index_find(index, path, stage)) < 0)
-		return position;
+	if (index_find(&position, index, path, stage) < 0)
+		return GIT_ENOTFOUND;
 
 	entry = git_vector_get(&index->entries, position);
 	if (entry != NULL)
@@ -846,7 +845,7 @@ int git_index_remove_directory(git_index *index, const char *dir, int stage)
 	return error;
 }
 
-static int index_find(git_index *index, const char *path, int stage)
+static int index_find(size_t *at_pos, git_index *index, const char *path, int stage)
 {
 	struct entry_srch_key srch_key;
 
@@ -855,20 +854,18 @@ static int index_find(git_index *index, const char *path, int stage)
 	srch_key.path = path;
 	srch_key.stage = stage;
 
-	return git_vector_bsearch2(&index->entries, index->entries_search, &srch_key);
+	return git_vector_bsearch2(at_pos, &index->entries, index->entries_search, &srch_key);
 }
 
-int git_index_find(git_index *index, const char *path)
+int git_index_find(size_t *at_pos, git_index *index, const char *path)
 {
-	int pos;
+	size_t pos;
 
 	assert(index && path);
 
-	if ((pos = git_vector_bsearch2(
-			&index->entries, index->entries_search_path, path)) < 0)
-	{
+	if (git_vector_bsearch2(&pos, &index->entries, index->entries_search_path, path) < 0) {
 		giterr_set(GITERR_INDEX, "Index does not contain %s", path);
-		return pos;
+		return GIT_ENOTFOUND;
 	}
 
 	/* Since our binary search only looked at path, we may be in the
@@ -883,7 +880,10 @@ int git_index_find(git_index *index, const char *path)
 		--pos;
 	}
 
-	return pos;
+	if (at_pos)
+		*at_pos = pos;
+
+	return 0;
 }
 
 size_t git_index__prefix_position(git_index *index, const char *path)
@@ -895,7 +895,7 @@ size_t git_index__prefix_position(git_index *index, const char *path)
 	srch_key.stage = 0;
 
 	git_vector_sort(&index->entries);
-	git_vector_bsearch3(
+	git_vector_bsearch2(
 		&pos, &index->entries, index->entries_search, &srch_key);
 
 	return pos;
@@ -945,7 +945,8 @@ int git_index_conflict_get(git_index_entry **ancestor_out,
 	git_index_entry **their_out,
 	git_index *index, const char *path)
 {
-	int pos, posmax, stage;
+	size_t pos, posmax;
+	int stage;
 	git_index_entry *conflict_entry;
 	int error = GIT_ENOTFOUND;
 
@@ -955,10 +956,10 @@ int git_index_conflict_get(git_index_entry **ancestor_out,
 	*our_out = NULL;
 	*their_out = NULL;
 
-	if ((pos = git_index_find(index, path)) < 0)
-		return pos;
+	if (git_index_find(&pos, index, path) < 0)
+		return GIT_ENOTFOUND;
 
-	for (posmax = (int)git_index_entrycount(index); pos < posmax; ++pos) {
+	for (posmax = git_index_entrycount(index); pos < posmax; ++pos) {
 
 		conflict_entry = git_vector_get(&index->entries, pos);
 
@@ -990,16 +991,16 @@ int git_index_conflict_get(git_index_entry **ancestor_out,
 
 int git_index_conflict_remove(git_index *index, const char *path)
 {
-	int pos, posmax;
+	size_t pos, posmax;
 	git_index_entry *conflict_entry;
 	int error = 0;
 
 	assert(index && path);
 
-	if ((pos = git_index_find(index, path)) < 0)
-		return pos;
+	if (git_index_find(&pos, index, path) < 0)
+		return GIT_ENOTFOUND;
 
-	posmax = (int)git_index_entrycount(index);
+	posmax = git_index_entrycount(index);
 
 	while (pos < posmax) {
 		conflict_entry = git_vector_get(&index->entries, pos);
@@ -1012,7 +1013,7 @@ int git_index_conflict_remove(git_index *index, const char *path)
 			continue;
 		}
 
-		if ((error = git_vector_remove(&index->entries, (unsigned int)pos)) < 0)
+		if ((error = git_vector_remove(&index->entries, pos)) < 0)
 			return error;
 
 		index_entry_free(conflict_entry);
@@ -1064,11 +1065,11 @@ unsigned int git_index_reuc_entrycount(git_index *index)
 static int index_reuc_insert(git_index *index, git_index_reuc_entry *reuc, int replace)
 {
 	git_index_reuc_entry **existing = NULL;
-	int position;
+	size_t position;
 
 	assert(index && reuc && reuc->path != NULL);
 
-	if ((position = git_index_reuc_find(index, reuc->path)) >= 0)
+	if (!git_index_reuc_find(&position, index, reuc->path))
 		existing = (git_index_reuc_entry **)&index->reuc.contents[position];
 
 	if (!replace || !existing)
@@ -1102,15 +1103,15 @@ int git_index_reuc_add(git_index *index, const char *path,
 	return error;
 } 
 
-int git_index_reuc_find(git_index *index, const char *path)
+int git_index_reuc_find(size_t *at_pos, git_index *index, const char *path)
 {
-	return git_vector_bsearch2(&index->reuc, index->reuc_search, path);
+	return git_vector_bsearch2(at_pos, &index->reuc, index->reuc_search, path);
 }
 
 const git_index_reuc_entry *git_index_reuc_get_bypath(
 	git_index *index, const char *path)
 {
-	int pos;
+	size_t pos;
 	assert(index && path);
 
 	if (!index->reuc.length)
@@ -1118,7 +1119,7 @@ const git_index_reuc_entry *git_index_reuc_get_bypath(
 
 	git_vector_sort(&index->reuc);
 
-	if ((pos = git_index_reuc_find(index, path)) < 0)
+	if (git_index_reuc_find(&pos, index, path) < 0)
 		return NULL;
 
 	return git_vector_get(&index->reuc, pos);
diff --git a/src/iterator.c b/src/iterator.c
index 1c36cac..8ad639d 100644
--- a/src/iterator.c
+++ b/src/iterator.c
@@ -689,7 +689,7 @@ static void workdir_iterator__seek_frame_start(
 		return;
 
 	if (wi->base.start)
-		git_vector_bsearch3(
+		git_vector_bsearch2(
 			&wf->index, &wf->entries, wi->entrycmp, wi->base.start);
 	else
 		wf->index = 0;
diff --git a/src/pack.c b/src/pack.c
index e19fc4b..f36f3cf 100644
--- a/src/pack.c
+++ b/src/pack.c
@@ -760,12 +760,11 @@ git_off_t get_delta_base(
 	} else if (type == GIT_OBJ_REF_DELTA) {
 		/* If we have the cooperative cache, search in it first */
 		if (p->has_cache) {
-			int pos;
+			size_t pos;
 			struct git_pack_entry key;
 
 			git_oid_fromraw(&key.sha1, base_info);
-			pos = git_vector_bsearch(&p->cache, &key);
-			if (pos >= 0) {
+			if (!git_vector_bsearch(&pos, &p->cache, &key)) {
 				*curpos += 20;
 				return ((struct git_pack_entry *)git_vector_get(&p->cache, pos))->offset;
 			}
diff --git a/src/remote.c b/src/remote.c
index 7dcba6d..920ca7a 100644
--- a/src/remote.c
+++ b/src/remote.c
@@ -681,9 +681,8 @@ int git_remote_download(
 static int update_tips_callback(git_remote_head *head, void *payload)
 {
 	git_vector *refs = (git_vector *)payload;
-	git_vector_insert(refs, head);
 
-	return 0;
+	return git_vector_insert(refs, head);
 }
 
 static int remote_head_for_fetchspec_src(git_remote_head **out, git_vector *update_heads, const char *fetchspec_src)
diff --git a/src/stash.c b/src/stash.c
index d4f81ae..877af33 100644
--- a/src/stash.c
+++ b/src/stash.c
@@ -192,7 +192,7 @@ static int update_index_cb(
 	case GIT_DELTA_DELETED:
 		if (!data->include_changed)
 			break;
-		if (git_index_find(data->index, delta->old_file.path) == 0)
+		if (git_index_find(NULL, data->index, delta->old_file.path) == 0)
 			data->error = git_index_remove(
 				data->index, delta->old_file.path, 0);
 		break;
diff --git a/src/submodule.c b/src/submodule.c
index 2be1793..3593064 100644
--- a/src/submodule.c
+++ b/src/submodule.c
@@ -157,7 +157,7 @@ int git_submodule_foreach(
 		 * and path are not the same.
 		 */
 		if (sm->refcount > 1) {
-			if (git_vector_bsearch(&seen, sm) != GIT_ENOTFOUND)
+			if (git_vector_bsearch(NULL, &seen, sm) != GIT_ENOTFOUND)
 				continue;
 			if ((error = git_vector_insert(&seen, sm)) < 0)
 				break;
@@ -716,7 +716,8 @@ int git_submodule_reload(git_submodule *submodule)
 {
 	git_repository *repo;
 	git_index *index;
-	int pos, error;
+	int error;
+	size_t pos;
 	git_tree *head;
 	git_config_backend *mods;
 
@@ -732,8 +733,7 @@ int git_submodule_reload(git_submodule *submodule)
 		~(GIT_SUBMODULE_STATUS_IN_INDEX |
 		  GIT_SUBMODULE_STATUS__INDEX_OID_VALID);
 
-	pos = git_index_find(index, submodule->path);
-	if (pos >= 0) {
+	if (!git_index_find(&pos, index, submodule->path)) {
 		const git_index_entry *entry = git_index_get_byindex(index, pos);
 
 		if (S_ISGITLINK(entry->mode)) {
diff --git a/src/tree.c b/src/tree.c
index c34e9b9..7fd0960 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -132,45 +132,56 @@ static int homing_search_cmp(const void *key, const void *array_member)
  * around the area for our target file.
  */
 static int tree_key_search(
-	git_vector *entries, const char *filename, size_t filename_len)
+	size_t *at_pos, git_vector *entries, const char *filename, size_t filename_len)
 {
 	struct tree_key_search ksearch;
 	const git_tree_entry *entry;
-	int homing, i;
+	size_t homing, i;
 
 	ksearch.filename = filename;
 	ksearch.filename_len = filename_len;
 
 	/* Initial homing search; find an entry on the tree with
 	 * the same prefix as the filename we're looking for */
-	homing = git_vector_bsearch2(entries, &homing_search_cmp, &ksearch);
-	if (homing < 0)
-		return homing;
+	if (git_vector_bsearch2(&homing, entries, &homing_search_cmp, &ksearch) < 0)
+		return GIT_ENOTFOUND;
 
 	/* We found a common prefix. Look forward as long as
 	 * there are entries that share the common prefix */
-	for (i = homing; i < (int)entries->length; ++i) {
+	for (i = homing; i < entries->length; ++i) {
 		entry = entries->contents[i];
 
 		if (homing_search_cmp(&ksearch, entry) < 0)
 			break;
 
 		if (entry->filename_len == filename_len &&
-			memcmp(filename, entry->filename, filename_len) == 0)
-			return i;
+			memcmp(filename, entry->filename, filename_len) == 0) {
+			if (at_pos)
+				*at_pos = i;
+
+			return 0;
+		}
 	}
 
 	/* If we haven't found our filename yet, look backwards
 	 * too as long as we have entries with the same prefix */
-	for (i = homing - 1; i >= 0; --i) {
-		entry = entries->contents[i];
+	if (homing > 0) {
+		i = homing - 1;
 
-		if (homing_search_cmp(&ksearch, entry) > 0)
-			break;
+		do {
+			entry = entries->contents[i];
 
-		if (entry->filename_len == filename_len &&
-			memcmp(filename, entry->filename, filename_len) == 0)
-			return i;
+			if (homing_search_cmp(&ksearch, entry) > 0)
+				break;
+
+			if (entry->filename_len == filename_len &&
+				memcmp(filename, entry->filename, filename_len) == 0) {
+				if (at_pos)
+					*at_pos = i;
+
+				return 0;
+			}
+		} while (i-- > 0);
 	}
 
 	/* The filename doesn't exist at all */
@@ -267,8 +278,9 @@ int git_tree_entry_to_object(
 static const git_tree_entry *entry_fromname(
 	git_tree *tree, const char *name, size_t name_len)
 {
-	int idx = tree_key_search(&tree->entries, name, name_len);
-	if (idx < 0)
+	size_t idx;
+
+	if (tree_key_search(&idx, &tree->entries, name, name_len) < 0)
 		return NULL;
 
 	return git_vector_get(&tree->entries, idx);
@@ -317,7 +329,7 @@ int git_tree__prefix_position(git_tree *tree, const char *path)
 	ksearch.filename_len = strlen(path);
 
 	/* Find tree entry with appropriate prefix */
-	git_vector_bsearch3(&at_pos, entries, &homing_search_cmp, &ksearch);
+	git_vector_bsearch2(&at_pos, entries, &homing_search_cmp, &ksearch);
 
 	for (; at_pos < entries->length; ++at_pos) {
 		const git_tree_entry *entry = entries->contents[at_pos];
@@ -612,7 +624,7 @@ int git_treebuilder_insert(
 	git_filemode_t filemode)
 {
 	git_tree_entry *entry;
-	int pos;
+	size_t pos;
 
 	assert(bld && id && filename);
 
@@ -622,41 +634,35 @@ int git_treebuilder_insert(
 	if (!valid_entry_name(filename))
 		return tree_error("Failed to insert entry. Invalid name for a tree entry", filename);
 
-	pos = tree_key_search(&bld->entries, filename, strlen(filename));
-
-	if (pos >= 0) {
+	if (!tree_key_search(&pos, &bld->entries, filename, strlen(filename))) {
 		entry = git_vector_get(&bld->entries, pos);
 		if (entry->removed)
 			entry->removed = 0;
 	} else {
 		entry = alloc_entry(filename);
 		GITERR_CHECK_ALLOC(entry);
-	}
-
-	git_oid_cpy(&entry->oid, id);
-	entry->attr = filemode;
 
-	if (pos < 0) {
 		if (git_vector_insert(&bld->entries, entry) < 0)
 			return -1;
 	}
 
-	if (entry_out != NULL) {
+	git_oid_cpy(&entry->oid, id);
+	entry->attr = filemode;
+
+	if (entry_out)
 		*entry_out = entry;
-	}
 
 	return 0;
 }
 
 static git_tree_entry *treebuilder_get(git_treebuilder *bld, const char *filename)
 {
-	int idx;
+	size_t idx;
 	git_tree_entry *entry;
 
 	assert(bld && filename);
 
-	idx = tree_key_search(&bld->entries, filename, strlen(filename));
-	if (idx < 0)
+	if (tree_key_search(&idx, &bld->entries, filename, strlen(filename)) < 0)
 		return NULL;
 
 	entry = git_vector_get(&bld->entries, idx);
diff --git a/src/util.c b/src/util.c
index 085b627..059108e 100644
--- a/src/util.c
+++ b/src/util.c
@@ -501,11 +501,11 @@ int git__bsearch(
 	int (*compare)(const void *, const void *),
 	size_t *position)
 {
-	unsigned int lim;
+	size_t lim;
 	int cmp = -1;
 	void **part, **base = array;
 
-	for (lim = (unsigned int)array_len; lim != 0; lim >>= 1) {
+	for (lim = array_len; lim != 0; lim >>= 1) {
 		part = base + (lim >> 1);
 		cmp = (*compare)(key, *part);
 		if (cmp == 0) {
@@ -521,7 +521,7 @@ int git__bsearch(
 	if (position)
 		*position = (base - array);
 
-	return (cmp == 0) ? 0 : -1;
+	return (cmp == 0) ? 0 : GIT_ENOTFOUND;
 }
 
 int git__bsearch_r(
@@ -532,11 +532,11 @@ int git__bsearch_r(
 	void *payload,
 	size_t *position)
 {
-	unsigned int lim;
+	size_t lim;
 	int cmp = -1;
 	void **part, **base = array;
 
-	for (lim = (unsigned int)array_len; lim != 0; lim >>= 1) {
+	for (lim = array_len; lim != 0; lim >>= 1) {
 		part = base + (lim >> 1);
 		cmp = (*compare_r)(key, *part, payload);
 		if (cmp == 0) {
@@ -552,7 +552,7 @@ int git__bsearch_r(
 	if (position)
 		*position = (base - array);
 
-	return (cmp == 0) ? 0 : -1;
+	return (cmp == 0) ? 0 : GIT_ENOTFOUND;
 }
 
 /**
diff --git a/src/util.h b/src/util.h
index 9bcd320..e75d777 100644
--- a/src/util.h
+++ b/src/util.h
@@ -13,6 +13,9 @@
 #ifndef min
 # define min(a,b) ((a) < (b) ? (a) : (b))
 #endif
+#ifndef max
+# define max(a,b) ((a) > (b) ? (a) : (b))
+#endif
 
 /*
  * Custom memory allocation wrappers
@@ -132,7 +135,7 @@ extern void git__tsort_r(
 /**
  * @param position If non-NULL, this will be set to the position where the
  * 		element is or would be inserted if not found.
- * @return pos (>=0) if found or -1 if not found
+ * @return 0 if found; GIT_ENOTFOUND if not found
  */
 extern int git__bsearch(
 	void **array,
diff --git a/src/vector.c b/src/vector.c
index 7fa3097..66842d4 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -9,33 +9,59 @@
 #include "repository.h"
 #include "vector.h"
 
-static const double git_vector_resize_factor = 1.75;
-static const size_t git_vector_minimum_size = 8;
+/* In elements, not bytes */
+#define MIN_ALLOCSIZE	8
 
-static int resize_vector(git_vector *v)
+GIT_INLINE(size_t) compute_new_size(git_vector *v)
 {
-	v->_alloc_size = (size_t)(v->_alloc_size * git_vector_resize_factor) + 1;
-	if (v->_alloc_size < git_vector_minimum_size)
-		v->_alloc_size = git_vector_minimum_size;
+	size_t new_size = v->_alloc_size;
+
+	/* Use a resize factor of 1.5, which is quick to compute using integer
+	 * instructions and less than the golden ratio (1.618...) */
+	if (new_size < MIN_ALLOCSIZE)
+		new_size = MIN_ALLOCSIZE;
+	else if (new_size <= SIZE_MAX / 3)
+		new_size = new_size * 3 / 2 + 1;
+	else
+		new_size = SIZE_MAX;
+
+	return new_size;
+}
 
-	v->contents = git__realloc(v->contents, v->_alloc_size * sizeof(void *));
-	GITERR_CHECK_ALLOC(v->contents);
+GIT_INLINE(int) resize_vector(git_vector *v, size_t new_size)
+{
+	size_t new_bytes = new_size * sizeof(void *);
+	void *new_contents;
+
+	/* Check for overflow */
+	if (new_bytes / sizeof(void *) != new_size)
+		GITERR_CHECK_ALLOC(NULL);
+
+	new_contents = git__realloc(v->contents, new_bytes);
+	GITERR_CHECK_ALLOC(new_contents);
+
+	v->_alloc_size = new_size;
+	v->contents = new_contents;
 
 	return 0;
 }
 
 int git_vector_dup(git_vector *v, const git_vector *src, git_vector_cmp cmp)
 {
+	size_t bytes;
+
 	assert(v && src);
 
+	bytes = src->length * sizeof(void *);
+
 	v->_alloc_size = src->length;
 	v->_cmp = cmp;
 	v->length = src->length;
 	v->sorted = src->sorted && cmp == src->_cmp;
-	v->contents = git__malloc(src->length * sizeof(void *));
+	v->contents = git__malloc(bytes);
 	GITERR_CHECK_ALLOC(v->contents);
 
-	memcpy(v->contents, src->contents, src->length * sizeof(void *));
+	memcpy(v->contents, src->contents, bytes);
 
 	return 0;
 }
@@ -55,21 +81,13 @@ int git_vector_init(git_vector *v, size_t initial_size, git_vector_cmp cmp)
 {
 	assert(v);
 
-	memset(v, 0x0, sizeof(git_vector));
-
-	if (initial_size == 0)
-		initial_size = git_vector_minimum_size;
-
-	v->_alloc_size = initial_size;
+	v->_alloc_size = 0;
 	v->_cmp = cmp;
-
 	v->length = 0;
 	v->sorted = 1;
+	v->contents = NULL;
 
-	v->contents = git__malloc(v->_alloc_size * sizeof(void *));
-	GITERR_CHECK_ALLOC(v->contents);
-
-	return 0;
+	return resize_vector(v, max(initial_size, MIN_ALLOCSIZE));
 }
 
 int git_vector_insert(git_vector *v, void *element)
@@ -77,7 +95,7 @@ int git_vector_insert(git_vector *v, void *element)
 	assert(v);
 
 	if (v->length >= v->_alloc_size &&
-		resize_vector(v) < 0)
+		resize_vector(v, compute_new_size(v)) < 0)
 		return -1;
 
 	v->contents[v->length++] = element;
@@ -98,26 +116,25 @@ int git_vector_insert_sorted(
 		git_vector_sort(v);
 
 	if (v->length >= v->_alloc_size &&
-		resize_vector(v) < 0)
+		resize_vector(v, compute_new_size(v)) < 0)
 		return -1;
 
 	/* If we find the element and have a duplicate handler callback,
 	 * invoke it.  If it returns non-zero, then cancel insert, otherwise
 	 * proceed with normal insert.
 	 */
-	if (git__bsearch(v->contents, v->length, element, v->_cmp, &pos) >= 0 &&
-		on_dup != NULL &&
-		(result = on_dup(&v->contents[pos], element)) < 0)
+	if (!git__bsearch(v->contents, v->length, element, v->_cmp, &pos) &&
+		on_dup && (result = on_dup(&v->contents[pos], element)) < 0)
 		return result;
 
 	/* shift elements to the right */
-	if (pos < v->length) {
+	if (pos < v->length)
 		memmove(v->contents + pos + 1, v->contents + pos,
 		        (v->length - pos) * sizeof(void *));
-	}
 
 	v->contents[pos] = element;
 	v->length++;
+
 	return 0;
 }
 
@@ -125,47 +142,44 @@ void git_vector_sort(git_vector *v)
 {
 	assert(v);
 
-	if (v->sorted || v->_cmp == NULL)
+	if (v->sorted || !v->_cmp)
 		return;
 
 	git__tsort(v->contents, v->length, v->_cmp);
 	v->sorted = 1;
 }
 
-int git_vector_bsearch3(
+int git_vector_bsearch2(
 	size_t *at_pos,
 	git_vector *v,
 	git_vector_cmp key_lookup,
 	const void *key)
 {
-	int rval;
-	size_t pos;
-
 	assert(v && key && key_lookup);
 
 	/* need comparison function to sort the vector */
-	assert(v->_cmp != NULL);
+	if (!v->_cmp)
+		return -1;
 
 	git_vector_sort(v);
 
-	rval = git__bsearch(v->contents, v->length, key, key_lookup, &pos);
-
-	if (at_pos != NULL)
-		*at_pos = pos;
-
-	return (rval >= 0) ? (int)pos : GIT_ENOTFOUND;
+	return git__bsearch(v->contents, v->length, key, key_lookup, at_pos);
 }
 
 int git_vector_search2(
-	const git_vector *v, git_vector_cmp key_lookup, const void *key)
+	size_t *at_pos, const git_vector *v, git_vector_cmp key_lookup, const void *key)
 {
 	size_t i;
 
 	assert(v && key && key_lookup);
 
 	for (i = 0; i < v->length; ++i) {
-		if (key_lookup(key, v->contents[i]) == 0)
-			return (int)i;
+		if (key_lookup(key, v->contents[i]) == 0) {
+			if (at_pos)
+				*at_pos = i;
+
+			return 0;
+		}
 	}
 
 	return GIT_ENOTFOUND;
@@ -176,22 +190,25 @@ static int strict_comparison(const void *a, const void *b)
 	return (a == b) ? 0 : -1;
 }
 
-int git_vector_search(const git_vector *v, const void *entry)
+int git_vector_search(size_t *at_pos, const git_vector *v, const void *entry)
 {
-	return git_vector_search2(v, v->_cmp ? v->_cmp : strict_comparison, entry);
+	return git_vector_search2(at_pos, v, v->_cmp ? v->_cmp : strict_comparison, entry);
 }
 
 int git_vector_remove(git_vector *v, size_t idx)
 {
-	size_t i;
+	size_t shift_count;
 
 	assert(v);
 
-	if (idx >= v->length || v->length == 0)
+	if (idx >= v->length)
 		return GIT_ENOTFOUND;
 
-	for (i = idx; i < v->length - 1; ++i)
-		v->contents[i] = v->contents[i + 1];
+	shift_count = v->length - idx - 1;
+
+	if (shift_count)
+		memmove(&v->contents[idx], &v->contents[idx + 1],
+			shift_count * sizeof(void *));
 
 	v->length--;
 	return 0;
@@ -249,12 +266,13 @@ void git_vector_swap(git_vector *a, git_vector *b)
 {
 	git_vector t;
 
-	if (!a || !b || a == b)
-		return;
+	assert(a && b);
 
-	memcpy(&t, a, sizeof(t));
-	memcpy(a, b, sizeof(t));
-	memcpy(b, &t, sizeof(t));
+	if (a != b) {
+		memcpy(&t, a, sizeof(t));
+		memcpy(a, b, sizeof(t));
+		memcpy(b, &t, sizeof(t));
+	}
 }
 
 int git_vector_resize_to(git_vector *v, size_t new_length)
@@ -262,9 +280,9 @@ int git_vector_resize_to(git_vector *v, size_t new_length)
 	if (new_length <= v->length)
 		return 0;
 
-	while (new_length >= v->_alloc_size)
-		if (resize_vector(v) < 0)
-			return -1;
+	if (new_length > v->_alloc_size &&
+		resize_vector(v, new_length) < 0)
+		return -1;
 
 	memset(&v->contents[v->length], 0,
 		sizeof(void *) * (new_length - v->length));
diff --git a/src/vector.h b/src/vector.h
index 023f4b6..690e4af 100644
--- a/src/vector.h
+++ b/src/vector.h
@@ -30,29 +30,22 @@ void git_vector_swap(git_vector *a, git_vector *b);
 void git_vector_sort(git_vector *v);
 
 /** Linear search for matching entry using internal comparison function */
-int git_vector_search(const git_vector *v, const void *entry);
+int git_vector_search(size_t *at_pos, const git_vector *v, const void *entry);
 
 /** Linear search for matching entry using explicit comparison function */
-int git_vector_search2(const git_vector *v, git_vector_cmp cmp, const void *key);
+int git_vector_search2(size_t *at_pos, const git_vector *v, git_vector_cmp cmp, const void *key);
 
 /**
  * Binary search for matching entry using explicit comparison function that
  * returns position where item would go if not found.
  */
-int git_vector_bsearch3(
+int git_vector_bsearch2(
 	size_t *at_pos, git_vector *v, git_vector_cmp cmp, const void *key);
 
 /** Binary search for matching entry using internal comparison function */
-GIT_INLINE(int) git_vector_bsearch(git_vector *v, const void *key)
+GIT_INLINE(int) git_vector_bsearch(size_t *at_pos, git_vector *v, const void *key)
 {
-	return git_vector_bsearch3(NULL, v, v->_cmp, key);
-}
-
-/** Binary search for matching entry using explicit comparison function */
-GIT_INLINE(int) git_vector_bsearch2(
-	git_vector *v, git_vector_cmp cmp, const void *key)
-{
-	return git_vector_bsearch3(NULL, v, cmp, key);
+	return git_vector_bsearch2(at_pos, v, v->_cmp, key);
 }
 
 GIT_INLINE(void *) git_vector_get(const git_vector *v, size_t position)
diff --git a/tests-clar/attr/repo.c b/tests-clar/attr/repo.c
index 926a0d8..ca3e71e 100644
--- a/tests-clar/attr/repo.c
+++ b/tests-clar/attr/repo.c
@@ -266,14 +266,13 @@ static void add_to_workdir(const char *filename, const char *content)
 
 static void assert_proper_normalization(git_index *index, const char *filename, const char *expected_sha)
 {
-	int index_pos;
+	size_t index_pos;
 	const git_index_entry *entry;
 
 	add_to_workdir(filename, CONTENT);
 	cl_git_pass(git_index_add_bypath(index, filename));
 
-	index_pos = git_index_find(index, filename);
-	cl_assert(index_pos >= 0);
+	cl_assert(!git_index_find(&index_pos, index, filename));
 
 	entry = git_index_get_byindex(index, index_pos);
 	cl_assert_equal_i(0, git_oid_streq(&entry->oid, expected_sha));
diff --git a/tests-clar/index/filemodes.c b/tests-clar/index/filemodes.c
index 1acd2e3..1bb4417 100644
--- a/tests-clar/index/filemodes.c
+++ b/tests-clar/index/filemodes.c
@@ -53,13 +53,12 @@ static void replace_file_with_mode(
 static void add_and_check_mode(
 	git_index *index, const char *filename, unsigned int expect_mode)
 {
-	int pos;
+	size_t pos;
 	const git_index_entry *entry;
 
 	cl_git_pass(git_index_add_bypath(index, filename));
 
-	pos = git_index_find(index, filename);
-	cl_assert(pos >= 0);
+	cl_assert(!git_index_find(&pos, index, filename));
 
 	entry = git_index_get_byindex(index, pos);
 	cl_assert(entry->mode == expect_mode);
diff --git a/tests-clar/index/rename.c b/tests-clar/index/rename.c
index 400bbdf..4deef13 100644
--- a/tests-clar/index/rename.c
+++ b/tests-clar/index/rename.c
@@ -5,7 +5,7 @@ void test_index_rename__single_file(void)
 {
 	git_repository *repo;
 	git_index *index;
-	int position;
+	size_t position;
 	git_oid expected;
 	const git_index_entry *entry;
 
@@ -24,7 +24,7 @@ void test_index_rename__single_file(void)
 
 	cl_git_pass(git_oid_fromstr(&expected, "d4fa8600b4f37d7516bef4816ae2c64dbf029e3a"));
 
-	position = git_index_find(index, "lame.name.txt");
+	cl_assert(!git_index_find(&position, index, "lame.name.txt"));
 
 	entry = git_index_get_byindex(index, position);
 	cl_assert(git_oid_cmp(&expected, &entry->oid) == 0);
@@ -38,7 +38,7 @@ void test_index_rename__single_file(void)
 	cl_git_pass(git_index_add_bypath(index, "fancy.name.txt"));
 	cl_assert(git_index_entrycount(index) == 1);
 
-	position = git_index_find(index, "fancy.name.txt");
+	cl_assert(!git_index_find(&position, index, "fancy.name.txt"));
 
 	entry = git_index_get_byindex(index, position);
 	cl_assert(git_oid_cmp(&expected, &entry->oid) == 0);
diff --git a/tests-clar/index/stage.c b/tests-clar/index/stage.c
index 4774568..58dc1fb 100644
--- a/tests-clar/index/stage.c
+++ b/tests-clar/index/stage.c
@@ -26,36 +26,36 @@ void test_index_stage__cleanup(void)
 
 void test_index_stage__add_always_adds_stage_0(void)
 {
-	int entry_idx;
+	size_t entry_idx;
 	const git_index_entry *entry;
 
     cl_git_mkfile("./mergedrepo/new-file.txt", "new-file\n");
 
 	cl_git_pass(git_index_add_bypath(repo_index, "new-file.txt"));
 
-	cl_assert((entry_idx = git_index_find(repo_index, "new-file.txt")) >= 0);
+	cl_assert(!git_index_find(&entry_idx, repo_index, "new-file.txt"));
 	cl_assert((entry = git_index_get_byindex(repo_index, entry_idx)) != NULL);
 	cl_assert(git_index_entry_stage(entry) == 0);
 }
 
 void test_index_stage__find_gets_first_stage(void)
 {
-	int entry_idx;
+	size_t entry_idx;
 	const git_index_entry *entry;
 
-	cl_assert((entry_idx = git_index_find(repo_index, "one.txt")) >= 0);
+	cl_assert(!git_index_find(&entry_idx, repo_index, "one.txt"));
 	cl_assert((entry = git_index_get_byindex(repo_index, entry_idx)) != NULL);
 	cl_assert(git_index_entry_stage(entry) == 0);
 
-	cl_assert((entry_idx = git_index_find(repo_index, "two.txt")) >= 0);
+	cl_assert(!git_index_find(&entry_idx, repo_index, "two.txt"));
 	cl_assert((entry = git_index_get_byindex(repo_index, entry_idx)) != NULL);
 	cl_assert(git_index_entry_stage(entry) == 0);
 
-	cl_assert((entry_idx = git_index_find(repo_index, "conflicts-one.txt")) >= 0);
+	cl_assert(!git_index_find(&entry_idx, repo_index, "conflicts-one.txt"));
 	cl_assert((entry = git_index_get_byindex(repo_index, entry_idx)) != NULL);
 	cl_assert(git_index_entry_stage(entry) == 1);
 
-	cl_assert((entry_idx = git_index_find(repo_index, "conflicts-two.txt")) >= 0);
+	cl_assert(!git_index_find(&entry_idx, repo_index, "conflicts-two.txt"));
 	cl_assert((entry = git_index_get_byindex(repo_index, entry_idx)) != NULL);
 	cl_assert(git_index_entry_stage(entry) == 1);
 }
diff --git a/tests-clar/index/tests.c b/tests-clar/index/tests.c
index 3c2a689..64f547e 100644
--- a/tests-clar/index/tests.c
+++ b/tests-clar/index/tests.c
@@ -10,7 +10,7 @@ static const size_t index_entry_count_2 = 1437;
 
 // Suite data
 struct test_entry {
-   int index;
+   size_t index;
    char path[128];
    git_off_t file_size;
    git_time_t mtime;
@@ -131,8 +131,10 @@ void test_index_tests__find_in_existing(void)
    cl_git_pass(git_index_open(&index, TEST_INDEX_PATH));
 
    for (i = 0; i < ARRAY_SIZE(test_entries); ++i) {
-      int idx = git_index_find(index, test_entries[i].path);
-      cl_assert(idx == test_entries[i].index);
+	  size_t idx;
+
+	  cl_assert(!git_index_find(&idx, index, test_entries[i].path));
+	  cl_assert(idx == test_entries[i].index);
    }
 
    git_index_free(index);
@@ -146,8 +148,7 @@ void test_index_tests__find_in_empty(void)
    cl_git_pass(git_index_open(&index, "fake-index"));
 
    for (i = 0; i < ARRAY_SIZE(test_entries); ++i) {
-      int idx = git_index_find(index, test_entries[i].path);
-      cl_assert(idx == GIT_ENOTFOUND);
+      cl_assert(GIT_ENOTFOUND == git_index_find(NULL, index, test_entries[i].path));
    }
 
    git_index_free(index);
diff --git a/tests-clar/submodule/status.c b/tests-clar/submodule/status.c
index 3250134..3fd6960 100644
--- a/tests-clar/submodule/status.c
+++ b/tests-clar/submodule/status.c
@@ -100,11 +100,10 @@ void test_submodule_status__ignore_none(void)
 	/* remove sm_changed_head from index */
 	{
 		git_index *index;
-		int pos;
+		size_t pos;
 
 		cl_git_pass(git_repository_index(&index, g_repo));
-		pos = git_index_find(index, "sm_changed_head");
-		cl_assert(pos >= 0);
+		cl_assert(!git_index_find(&pos, index, "sm_changed_head"));
 		cl_git_pass(git_index_remove(index, "sm_changed_head", 0));
 		cl_git_pass(git_index_write(index));