more chdir wip

assets/tvdos/TVDOS.SYS

@@ -69,6 +69,16 @@ filesystem.readAll = function(driveLetter) {
     }
     return com.pullMessage(port[0]);
 };
+filesystem.isDirectory = function(driveLetter) {
+    let port = filesystem._toPorts(driveLetter);
+    com.sendMessage(port[0], "LISTFILES");
+    let response = com.getStatusCode(port[0]);
+
+    if (135 == response) {
+        throw Error("File not opened");
+    }
+    return (response === 0);
+}
 Object.freeze(filesystem);
 
 ///////////////////////////////////////////////////////////////////////////////

assets/tvdos/bin/command.js

@@ -138,9 +138,22 @@ shell.coreutils = {
             return
         }
 
+        // replace slashes into revslashes
         let pathstr = args[1].replaceAll('/','\\\\');
+        // split them into an array while filtering empty elements except for the root 'head'
         let newPwd = [""].concat(pathstr.split("\\").filter(function(it) { return (it.length > 0); }));
+        // construct new pathstr from pwd arr so it will be sanitised
+        pathstr = newPwd.join('\\').substring(1);
 
+        if (DEBUG_PRINT) serial.println("command.js > pathstr = "+pathstr);
+
+        // check if path is valid
+        let dirOpened = filesystem.open(CURRENT_DRIVE, pathstr, 'R');
+        if (!dirOpened) { printerrln("CHDIR failed for '"+pathstr+"'"); return; }
+
+        // check if path is directory
+        let isDir = filesystem.isDirectory(CURRENT_DRIVE);
+        if (!isDir) { printerrln("CHDIR failed for '"+pathstr+"'"); return; }
 
         shell_pwd = newPwd;
     },

src/net/torvald/tsvm/peripheral/TestDiskDrive.kt

@@ -365,6 +365,8 @@ class TestDiskDrive(private val driveNum: Int, theRootPath: File? = null) : Bloc
 
     // applies a "cap" if the path attemps to access parent directory of the root
     private fun filterSuperRoot(path: String): String {
+        if (path.isEmpty()) return path
+
         var parentCount = 0
         val paths = path.split('/')
         val newPaths = ArrayList<String>()

src/net/torvald/tsvm/vdc/V2kRunTest.kt

@@ -29,7 +29,7 @@ class V2kRunTest(val appConfig: LwjglApplicationConfiguration) : ApplicationAdap
     override fun create() {
         super.create()
 
-        gpu = GraphicsAdapter(vm, lcdMode = false)
+        gpu = GraphicsAdapter(vm, theme = GraphicsAdapter.THEME_COLORCRT)
 
         vm.peripheralTable[1] = PeripheralEntry(
             VM.PERITYPE_GPU_AND_TERM,