Replace invlid output before logging it

doc/changelog.txt

@@ -9,6 +9,8 @@
   Closes: GH bug #28
 * Updated PyPI trove classifiers to include Python 3
   Closes: GH bug #25
+* Escape output messages before logging them.
+  Closes: GH bug #29
 
 
 1.8 (released 19.7.2015)

patoolib/util.py

@@ -17,6 +17,7 @@
 from __future__ import print_function
 import os
 import sys
+import codecs
 import shutil
 import subprocess
 import mimetypes
@@ -492,6 +493,14 @@ def get_single_outfile (directory, archive, extension=""):
     return outfile + extension
 
 
+def init_log():
+    """Wrap sys.stdout and sys.stderr in encoding-aware stream writers."""
+    encoding = locale.getpreferredencoding()
+    errors = 'backslashreplace'
+    sys.stdout = codecs.getwriter(encoding)(sys.stdout, errors)
+    sys.stderr = codecs.getwriter(encoding)(sys.stderr, errors)
+
+
 def log_error (msg, out=sys.stderr):
     """Print error message to stderr (or any other given output)."""
     print("patool error:", msg, file=out)
@@ -686,4 +695,5 @@ def chdir(directory):
     return olddir
 
 
+init_log()
 init_mimedb()