fix: handle stdin correct with EOF single.

Signed-off-by: yihong0618 <[email protected]>

Author: yihong0618

Lib/base64.py

@@ -601,7 +601,13 @@ def main():
         with open(args[0], 'rb') as f:
             func(f, sys.stdout.buffer)
     else:
-        func(sys.stdin.buffer, sys.stdout.buffer)
+        # Read all input data at once when reading from stdin
+        # This allows proper handling of EOF (Ctrl+D)
+        input_data = sys.stdin.buffer.read()
+        if input_data:
+            import io
+            input_buffer = io.BytesIO(input_data)
+            func(input_buffer, sys.stdout.buffer)
 
 
 if __name__ == '__main__':

Misc/NEWS.d/next/Library/2025-09-11-15-03-37.gh-issue-138775.w7rnSx.rst

@@ -0,0 +1 @@
+Fix: handle "python -m base64" stdin correct with EOF single.