serial.cpp, proper win32 checks for dev

[Adib Taraben]

 Attached there is a patch to make proper win32 checks
against the file-handle dev.

Also I don't know exactly whether an valid FILE in UNIX is:
dev > 0
or
dev >= 0

This patch is against the serial.cpp version that I
found in
commoncpp2-1.1.0.tar.gz
from sourceforge using following command:
  diff -c serial_org.cpp serial.cpp > devcheck.patch

HTH,

Adib.

*** serial_org.cpp      Sat Jan 17 11:51:02 2004
--- serial.cpp  Mon Mar  8 13:05:56 2004
***************
*** 118,124 ****
--- 118,128 ----
  
        open(fname);
  
+ #ifdef        WIN32
+       if(INVALID_HANDLE_VALUE == dev)
+ #else
        if(0 > dev)
+ #endif
        {
                error(errOpenFailed);
                return;
***************
*** 254,260 ****
--- 258,268 ----
  
  void Serial::endSerial(void)
  {
+ #ifdef        WIN32
+       if(INVALID_HANDLE_VALUE != dev)
+ #else
        if(0 < dev)
+ #endif
  #ifdef        WIN32
        {
                SetCommState(dev, (DCB *)original);
***************
*** 390,396 ****
--- 398,408 ----
  {
        Serial::close();
  
+ #ifdef        WIN32
+       if(INVALID_HANDLE_VALUE == ser.dev)
+ #else
        if(ser.dev < 0)
+ #endif
                return *this;
  
  #ifdef        WIN32
***************
*** 1060,1066 ****
--- 1072,1082 ----
  
  void TTYStream::interactive(bool iflag)
  {
+ #ifdef        WIN32
+       if(INVALID_HANDLE_VALUE == dev)
+ #else
        if(dev < 0)
+ #endif
                return;
  
        if(bufsize >= 1)
***************
*** 1305,1311 ****
--- 1321,1331 ----
        
        Serial::open(pathname);
  
+ #ifdef        WIN32
        if(INVALID_HANDLE_VALUE == dev)
+ #else
+       if(dev < 0)
+ #endif
        {
                error(errOpenFailed);
                return;