more chdir wip

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;
     },