prevent underflow

wagoodman · Jun 1, 2018 · 563d4b3 · 563d4b3
1 parent 71b36ea
commit 563d4b3
Show file tree

Hide file tree

Showing 2 changed files with 5 additions and 5 deletions.
diff --git a/filetree.go b/filetree.go
@@ -210,9 +210,9 @@ func (tree *FileTree) MarkRemoved(path string) error {
 	return node.AssignDiffType(Removed)
 }
 
-func StackRange(trees []*FileTree, index int) *FileTree {
+func StackRange(trees []*FileTree, index uint) *FileTree {
 	tree := trees[0].Copy()
-	for idx := 1; idx < index; idx++ {
+	for idx := uint(1); idx < index; idx++ {
 		tree.Stack(trees[idx])
 	}
 	return tree

diff --git a/main.go b/main.go
@@ -18,8 +18,8 @@ var data struct {
 	tree            *FileTree
 	refTrees        []*FileTree
 	manifest        *Manifest
-	absDFSTreeIndex int
-	layerIndex      int
+	absDFSTreeIndex uint
+	layerIndex      uint
 }
 
 func check(e error) {
@@ -118,7 +118,7 @@ func demo() {
 func getAbsPositionNode() (node *FileNode) {
 	var visiter func(*FileNode) error
 	var evaluator func(*FileNode) bool
-	var dfsCounter int
+	var dfsCounter uint
 
 	visiter = func(curNode *FileNode) error {
 		if dfsCounter == data.absDFSTreeIndex {