[3.6] bpo-32228: Reset raw_pos after unwinding the raw stream (GH-4858) (#5389)

Ensure that ``truncate()`` preserves the file position (as reported by ``tell()``) after writes longer than the buffer size..
(cherry picked from commit 059f58ce93)

Lib/test/test_io.py

@@ -1703,6 +1703,23 @@ class BufferedWriterTest(unittest.TestCase, CommonBufferedTests):
         with self.open(support.TESTFN, "rb", buffering=0) as f:
             self.assertEqual(f.read(), b"abc")
 
+    def test_truncate_after_write(self):
+        # Ensure that truncate preserves the file position after
+        # writes longer than the buffer size.
+        # Issue: https://bugs.python.org/issue32228
+        with self.open(support.TESTFN, "wb") as f:
+            # Fill with some buffer
+            f.write(b'\x00' * 10000)
+        buffer_sizes = [8192, 4096, 200]
+        for buffer_size in buffer_sizes:
+            with self.open(support.TESTFN, "r+b", buffering=buffer_size) as f:
+                f.write(b'\x00' * (buffer_size + 1))
+                # After write write_pos and write_end are set to 0
+                f.read(1)
+                # read operation makes sure that pos != raw_pos
+                f.truncate()
+                self.assertEqual(f.tell(), buffer_size + 2)
+
     @unittest.skipUnless(threading, 'Threading required for this test.')
     @support.requires_resource('cpu')
     def test_threads(self):

Misc/NEWS.d/next/Library/2017-12-22-16-47-41.bpo-32228.waPx3q.rst

@@ -0,0 +1 @@
+Ensure that ``truncate()`` preserves the file position (as reported by ``tell()``) after writes longer than the buffer size.

Modules/_io/bufferedio.c

@@ -1311,7 +1311,6 @@ _io__Buffered_seek_impl(buffered *self, PyObject *targetobj, int whence)
         if (res == NULL)
             goto end;
         Py_CLEAR(res);
-        _bufferedwriter_reset_buf(self);
     }
 
     /* TODO: align on block boundary and read buffer if needed? */
@@ -1878,8 +1877,6 @@ _bufferedwriter_raw_write(buffered *self, char *start, Py_ssize_t len)
     return n;
 }
 
-/* `restore_pos` is 1 if we need to restore the raw stream position at
-   the end, 0 otherwise. */
 static PyObject *
 _bufferedwriter_flush_unlocked(buffered *self)
 {
@@ -1920,9 +1917,18 @@ _bufferedwriter_flush_unlocked(buffered *self)
             goto error;
     }
 
-    _bufferedwriter_reset_buf(self);
 
 end:
+    /* This ensures that after return from this function,
+       VALID_WRITE_BUFFER(self) returns false.
+
+       This is a required condition because when a tell() is called
+       after flushing and if VALID_READ_BUFFER(self) is false, we need
+       VALID_WRITE_BUFFER(self) to be false to have
+       RAW_OFFSET(self) == 0.
+
+       Issue: https://bugs.python.org/issue32228 */
+    _bufferedwriter_reset_buf(self);
     Py_RETURN_NONE;
 
 error: