Added code to detect valid serial ports.

Next we have to tie this into the UI, so AtariVox port can be more easily detected.

src/emucore/SerialPort.hxx

@@ -65,6 +65,13 @@ class SerialPort
     */
     virtual bool isCTS() { return true; }
 
+    /**
+      Get all valid serial ports detected on this system.
+
+      @return  The (possibly empty) list of detected serial ports
+    */
+    virtual StringList portNames() { return StringList{}; }
+
   private:
     // Following constructors and assignment operators not supported
     SerialPort(const SerialPort&) = delete;

src/macos/SerialPortMACOS.cxx

@@ -25,6 +25,7 @@
 #include <sys/filio.h>
 #include <sys/ioctl.h>
 
+#include "FSNode.hxx"
 #include "SerialPortMACOS.hxx"
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -92,3 +93,26 @@ bool SerialPortMACOS::isCTS()
   }
   return false;
 }
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+StringList SerialPortMACOS::portNames()
+{
+  StringList ports;
+
+  // Get all possible devices in the '/dev' directory
+  FilesystemNode::NameFilter filter = [](const FilesystemNode& node) {
+    return BSPF::startsWithIgnoreCase(node.getPath(), "/dev/tty.usb");
+  };
+  FSList portList;
+  portList.reserve(16);
+
+  FilesystemNode dev("/dev/");
+  dev.getChildren(portList, FilesystemNode::ListMode::All, filter, false);
+
+  // Add only those that can be opened
+  for(const auto& port: portList)
+    if(openPort(port.getPath()))
+      ports.emplace_back(port.getPath());
+
+  return ports;
+}

src/macos/SerialPortMACOS.hxx

@@ -21,8 +21,7 @@
 #include "SerialPort.hxx"
 
 /**
-  Implement reading and writing from a serial port under macOS.  For now,
+  Implement reading and writing from a serial port under macOS.
-  reading isn't actually supported at all.
 
   @author  Stephen Anthony & D. Spice
 */
@@ -63,6 +62,13 @@ class SerialPortMACOS : public SerialPort
     */
     bool isCTS() override;
 
+    /**
+      Get all valid serial ports detected on this system.
+
+      @return  The (possibly empty) list of detected serial ports
+    */
+    StringList portNames() override;
+
   private:
     // File descriptor for serial connection
     int myHandle{0};

src/unix/SerialPortUNIX.cxx

@@ -24,6 +24,7 @@
 #include <sys/ioctl.h>
 #include <cstring>
 
+#include "FSNode.hxx"
 #include "SerialPortUNIX.hxx"
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -95,3 +96,28 @@ bool SerialPortUNIX::isCTS()
   }
   return false;
 }
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+StringList SerialPortUNIX::portNames()
+{
+  StringList ports;
+
+  // Get all possible devices in the '/dev' directory
+  FilesystemNode::NameFilter filter = [](const FilesystemNode& node) {
+    return BSPF::startsWithIgnoreCase(node.getPath(), "/dev/ttyACM") ||
+           BSPF::startsWithIgnoreCase(node.getPath(), "/dev/ttyS")   ||
+           BSPF::startsWithIgnoreCase(node.getPath(), "/dev/ttyUSB");
+  };
+  FSList portList;
+  portList.reserve(16);
+
+  FilesystemNode dev("/dev/");
+  dev.getChildren(portList, FilesystemNode::ListMode::All, filter, false);
+
+  // Add only those that can be opened
+  for(const auto& port: portList)
+    if(openPort(port.getPath()))
+      ports.emplace_back(port.getPath());
+
+  return ports;
+}

src/unix/SerialPortUNIX.hxx

@@ -22,7 +22,7 @@
 
 /**
   Implement reading and writing from a serial port under UNIX.  For now,
-  it seems to be Linux-only, and reading isn't actually supported at all.
+  it seems to be Linux-only.
 
   @author  Stephen Anthony
 */
@@ -63,6 +63,13 @@ class SerialPortUNIX : public SerialPort
     */
     bool isCTS() override;
 
+    /**
+      Get all valid serial ports detected on this system.
+
+      @return  The (possibly empty) list of detected serial ports
+    */
+    StringList portNames() override;
+
   private:
     // File descriptor for serial connection
     int myHandle{0};

src/windows/SerialPortWINDOWS.cxx

@@ -112,3 +112,39 @@ bool SerialPortWINDOWS::isCTS()
   }
   return false;
 }
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+StringList SerialPortWINDOWS::portNames()
+{
+  StringList ports;
+
+  HKEY hKey = NULL;
+  LSTATUS result = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
+    L"HARDWARE\\DEVICEMAP\\SERIALCOMM", 0, KEY_READ, &hKey);
+  if (result == ERROR_SUCCESS)
+  {
+    TCHAR deviceName[2048], friendlyName[32];
+    DWORD numValues = 0;
+
+    result = RegQueryInfoKey(hKey, NULL, NULL, NULL, NULL, NULL, NULL,
+      &numValues, NULL, NULL, NULL, NULL);
+    if (result == ERROR_SUCCESS)
+    {
+      DWORD type = 0;
+      DWORD deviceNameLen = 2047;
+      DWORD friendlyNameLen = 31;
+
+      for (DWORD i = 0; i < numValues; ++i)
+      {
+        result = RegEnumValue(hKey, i, deviceName, &deviceNameLen,
+          NULL, &type, (LPBYTE)friendlyName, &friendlyNameLen);
+
+        if (result == ERROR_SUCCESS && type == REG_SZ)
+          ports.emplace_back(friendlyName);
+      }
+    }
+  }
+  RegCloseKey(hKey);
+
+  return ports;
+}

src/windows/SerialPortWINDOWS.hxx

@@ -63,6 +63,13 @@ class SerialPortWINDOWS : public SerialPort
     */
     bool isCTS() override;
 
+    /**
+      Get all valid serial ports detected on this system.
+
+      @return  The (possibly empty) list of detected serial ports
+    */
+    StringList portNames() override;
+
   private:
     // Handle to serial port
     HANDLE myHandle{0};

src/windows/Stella.vcxproj

@@ -1742,7 +1742,6 @@
     <ClInclude Include="..\emucore\AmigaMouse.hxx" />
     <ClInclude Include="..\emucore\AtariMouse.hxx" />
     <ClInclude Include="..\emucore\Bankswitch.hxx" />
-    <ClInclude Include="..\emucore\BSType.hxx" />
     <ClInclude Include="..\emucore\Cart3EPlus.hxx" />
     <ClInclude Include="..\emucore\Cart3EX.hxx" />
     <ClInclude Include="..\emucore\Cart4KSC.hxx" />

src/windows/Stella.vcxproj.filters

@@ -1829,9 +1829,6 @@
     <ClInclude Include="..\common\tv_filters\AtariNTSC.hxx">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\emucore\BSType.hxx">
-      <Filter>Header Files\emucore</Filter>
-    </ClInclude>
     <ClInclude Include="..\emucore\CartDetector.hxx">
       <Filter>Header Files\emucore</Filter>
     </ClInclude>