PyTokenizer_FindEncoding() always failed because it set the tokenizer state

with only a file pointer when it called fp_setreadl() which expected a file
path. Changed fp_setreadl() to use either a file path or file descriptor
(derived from the file pointer) to fix the issue.

Closes issue 3594.
Reviewed by Antoine Pitrou and Benjamin Peterson.

Lib/test/test_imp.py

 import imp
+import sys
 import unittest
 from test import support
 
@@ -59,6 +60,21 @@ class ImportTests(unittest.TestCase):
                          '"""Tokenization help for Python programs.\n')
         fp.close()
 
+    def test_issue3594(self):
+        temp_mod_name = 'test_imp_helper'
+        sys.path.insert(0, '.')
+        try:
+            with open(temp_mod_name + '.py', 'w') as file:
+                file.write("# coding: cp1252\nu = 'test.test_imp'\n")
+            file, filename, info = imp.find_module(temp_mod_name)
+            file.close()
+            self.assertEquals(file.encoding, 'cp1252')
+        finally:
+            del sys.path[0]
+            support.unlink(temp_mod_name + '.py')
+            support.unlink(temp_mod_name + '.pyc')
+            support.unlink(temp_mod_name + '.pyo')
+
     def test_reload(self):
         import marshal
         imp.reload(marshal)

Misc/NEWS

@@ -12,6 +12,10 @@ What's New in Python 3.0 release candidate 1
 Core and Builtins
 -----------------
 
+- Issue 3594: Fix Parser/tokenizer.c:fp_setreadl() to open the file being
+  tokenized by either a file path or file pointer for the benefit of
+  PyTokenizer_FindEncoding().
+
 - Issue #3696: Error parsing arguments on OpenBSD <= 4.4 and Cygwin. On
   these systems, the mbstowcs() function is slightly buggy and must be
   replaced with strlen() for the purpose of counting of number of wide

Parser/tokenizer.c

@@ -448,8 +448,12 @@ fp_setreadl(struct tok_state *tok, const char* enc)
 	if (io == NULL)
 		goto cleanup;
 
-	stream = PyObject_CallMethod(io, "open", "ssis",
-				     tok->filename, "r", -1, enc);
+	if (tok->filename)
+		stream = PyObject_CallMethod(io, "open", "ssis",
+					     tok->filename, "r", -1, enc);
+	else
+		stream = PyObject_CallMethod(io, "open", "isis",
+				fileno(tok->fp), "r", -1, enc);
 	if (stream == NULL)
 		goto cleanup;