From dde53f69f11571161c1db7c43ebfc3cfdfcc6f96 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Thu, 7 Jan 2021 08:16:57 -0800
Subject: [PATCH] use tokenize.open to avoid incorrect line endings at
 beginning of file

---
 pycodestyle.py    | 6 ++----
 testsuite/crlf.py | 3 +++
 2 files changed, 5 insertions(+), 4 deletions(-)
 create mode 100644 testsuite/crlf.py

diff --git a/pycodestyle.py b/pycodestyle.py
index 17fac7a8..2f4313ff 100755
--- a/pycodestyle.py
+++ b/pycodestyle.py
@@ -1814,10 +1814,8 @@ def readlines(filename):
     def readlines(filename):
         """Read the source code."""
         try:
-            with open(filename, 'rb') as f:
-                (coding, lines) = tokenize.detect_encoding(f.readline)
-                f = TextIOWrapper(f, coding, line_buffering=True)
-                return [line.decode(coding) for line in lines] + f.readlines()
+            with tokenize.open(filename) as f:
+                return f.readlines()
         except (LookupError, SyntaxError, UnicodeError):
             # Fall back if file encoding is improperly declared
             with open(filename, encoding='latin-1') as f:
diff --git a/testsuite/crlf.py b/testsuite/crlf.py
new file mode 100644
index 00000000..41f0d0fc
--- /dev/null
+++ b/testsuite/crlf.py
@@ -0,0 +1,3 @@
+'''\
+test
+'''