fix csv format error

backend/scanner.py

@@ -172,13 +172,26 @@ def _normalize_input_path(path_value):
     path = resolve_runtime_path(path_value)
     path = str(path).strip()
 
+    # Normalize forward slashes to backslashes first
+    path = path.replace("/", "\\")
+
+    # Accept \\server\share style UNC paths and ensure proper escaping
+    if path.startswith("\\\\"):
+        # Clean up any doubled backslashes from replacement
+        while "\\\\\\" in path:
+            path = path.replace("\\\\\\", "\\\\")
+        return path
+
     # Accept //server/share style and normalize to UNC for smbclient.
     if path.startswith("//"):
-        return "\\\\" + path.lstrip("/").replace("/", "\\")
+        path = path.lstrip("/").replace("/", "\\")
+        return "\\\\" + path
 
     # Accept /<ipv4>/<share>/... and normalize to UNC for Linux-hosted inputs.
-    if re.match(r"^/\d{1,3}(?:\.\d{1,3}){3}/[^/]+", path):
-        return "\\\\" + path.lstrip("/").replace("/", "\\")
+    if re.match(r"^\\?\d{1,3}(?:\\\.\d{1,3}){3}\\[^\\]+", path):
+        if path.startswith("\\"):
+            path = path.lstrip("\\")
+        return "\\\\" + path
 
     return path
 
@@ -225,6 +238,27 @@ def _iter_dir_entries(path, smb_credentials=None):
     return list(os.scandir(path))
 
 
+def path_exists_with_smb(path, smb_credentials=None):
+    """Check if a path exists, with SMB authentication for UNC paths."""
+    if not path:
+        return False
+    
+    path = _normalize_input_path(path)
+    
+    # For UNC paths, use SMB to check
+    if _is_unc_path(path):
+        try:
+            _register_smb_session_if_needed(path, smb_credentials=smb_credentials)
+            # Try to list entries; if successful, path exists
+            _iter_dir_entries(path, smb_credentials=smb_credentials)
+            return True
+        except Exception:
+            return False
+    
+    # For local paths, use standard os.path.exists
+    return os.path.exists(path)
+
+
 def scan_results(results_dir_dut, results_dir_ref, smb_credentials=None):
     results_dir_dut = _normalize_input_path(results_dir_dut)
     results_dir_ref = _normalize_input_path(results_dir_ref)