Index: Tools/scripts/reindent.py
===================================================================
--- Tools/scripts/reindent.py	(revision 85501)
+++ Tools/scripts/reindent.py	(working copy)
@@ -35,7 +35,7 @@
 
 The backup file is a copy of the one that is being reindented. The ".bak"
 file is generated with shutil.copy(), but some corner cases regarding
-user/group and permissions could leave the backup file more readable that
+user/group and permissions could leave the backup file more readable than
 you'd prefer. You can always use the --nobackup option to prevent this.
 """
 
@@ -127,7 +127,7 @@
                 shutil.copyfile(file, bak)
                 if verbose:
                     print("backed up", file, "to", bak)
-            with open(file, "w") as f:
+            with open(file, 'w', newline=r.newlines) as f:
                 r.write(f)
             if verbose:
                 print("wrote new", file)
@@ -175,6 +175,10 @@
         # indeed, they're our headache!
         self.stats = []
 
+        # Save the newlines found in the file so they can be used to
+        #  create output without mutating the newlines.
+        self.newlines = f.newlines
+
     def run(self):
         tokens = tokenize.generate_tokens(self.getline)
         for _token in tokens: