better NUL check

whyrusleeping · May 8, 2018 · a374e49 · a374e49
1 parent e1e9d51
commit a374e49
Showing 1 changed file with 13 additions and 1 deletion.
diff --git a/sanitize_windows.go b/sanitize_windows.go
@@ -21,7 +21,19 @@ func init() {
 }
 
 func isNullDevice(path string) bool {
-	return strings.ToUpper(path) == os.DevNull
+	if len(path) != 3 {
+		return false
+	}
+	if path[0]|0x20 != 'n' {
+		return false
+	}
+	if path[1]|0x20 != 'u' {
+		return false
+	}
+	if path[2]|0x20 != 'l' {
+		return false
+	}
+	return true
 }
 
 func sanitizePath(pathElements []string) string {