2 files changed, 37 insertions, 0 deletions
diff --git a/utils/clen.go b/utils/clen.go
new file mode 100644
index 0000000..17d1c4b
--- /dev/null
+++ b/utils/clen.go
@@ -0,0 +1,11 @@
+package utils
+
+// Clen returns the length of a null terminated string like in C
+func Clen(n []byte) int {
+	for i := 0; i < len(n); i++ {
+		if n[i] == 0 {
+			return i
+		}
+	}
+	return len(n)
+}
diff --git a/utils/clen_test.go b/utils/clen_test.go
new file mode 100644
index 0000000..19361b0
--- /dev/null
+++ b/utils/clen_test.go
@@ -0,0 +1,26 @@
+package utils
+
+import "testing"
+
+func TestClen(t *testing.T) {
+	normalString := append([]byte("abcd"), 0)
+	type args struct {
+		n []byte
+	}
+	tests := []struct {
+		name string
+		args args
+		want int
+	}{
+		{"empty string", args{}, 0},
+		{"normal string", args{normalString}, 4},
+		{"non null terminated string", args{[]byte("abcd")}, 4},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := Clen(tt.args.n); got != tt.want {
+				t.Errorf("Clen() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}