Windows: Fix clear() method

For Win32 and WinCE the clear() method must have a
different implementation. E.g. on Win32 should be also
cleaned variables: actualReadBufferSize, actualWriteBufferSize,
acyncWritePosition and writeSequenceStarted.

Change-Id: I80bcd223afb17f929e80889947a52fb505f8a5e6
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>

2 files changed, 20 insertions, 4 deletions

diff --git a/src/serialport/serialport_win.cpp b/src/serialport/serialport_win.cpp
index 1f8d45f..0476536 100644
--- a/src/serialport/serialport_win.cpp
+++ b/src/serialport/serialport_win.cpp
@@ -338,18 +338,24 @@ bool SerialPortPrivate::flush()
     return startAsyncWrite() && ::FlushFileBuffers(descriptor);
 }
 
-#endif
-
 bool SerialPortPrivate::clear(SerialPort::Directions dir)
 {
     DWORD flags = 0;
-    if (dir & SerialPort::Input)
+    if (dir & SerialPort::Input) {
         flags |= PURGE_RXABORT | PURGE_RXCLEAR;
-    if (dir & SerialPort::Output)
+        actualReadBufferSize = 0;
+    }
+    if (dir & SerialPort::Output) {
         flags |= PURGE_TXABORT | PURGE_TXCLEAR;
+        actualWriteBufferSize = 0;
+        acyncWritePosition = 0;
+        writeSequenceStarted = false;
+    }
     return ::PurgeComm(descriptor, flags);
 }
 
+#endif
+
 bool SerialPortPrivate::sendBreak(int duration)
 {
     // FIXME:
diff --git a/src/serialport/serialport_wince.cpp b/src/serialport/serialport_wince.cpp
index e713ce9..d6ff872 100644
--- a/src/serialport/serialport_wince.cpp
+++ b/src/serialport/serialport_wince.cpp
@@ -228,6 +228,16 @@ bool SerialPortPrivate::flush()
     return notifyWrite() && ::FlushFileBuffers(descriptor);
 }
 
+bool SerialPortPrivate::clear(SerialPort::Directions dir)
+{
+    DWORD flags = 0;
+    if (dir & SerialPort::Input)
+        flags |= PURGE_RXABORT | PURGE_RXCLEAR;
+    if (dir & SerialPort::Output)
+        flags |= PURGE_TXABORT | PURGE_TXCLEAR;
+    return ::PurgeComm(descriptor, flags);
+}
+
 qint64 SerialPortPrivate::bytesAvailable() const
 {
     return readBuffer.size();