Added --limit-file-checks command line option.

Author: kirk-sayre-work

analyze.js

@@ -911,7 +911,7 @@ var wscript_proxy = new Proxy({
     quit: function() {        
         lib.logIOC("WScript", "Quit()", "The sample explicitly called WScript.Quit().");
         //console.trace()
-        if (!argv["ignore-wscript-quit"]) {
+        if ((!argv["ignore-wscript-quit"]) || lib.doWscriptQuit()) {
             process.exit(0);
         }
     },

emulator/FileSystemObject.js

@@ -174,18 +174,38 @@ function FileSystemObject() {
 	return true;
     };
     this.fileexists = (path) => {
-	const value = !argv["no-file-exists"];
+	var value = !argv["no-file-exists"];
 	if (value) {
 	    lib.info(`Returning true for FileSystemObject.FileExists(${path}); use --no-file-exists if nothing happens`);
 	}
+	if (typeof(this._fileCheckCount) == "undefined") this._fileCheckCount = 0;
+	this._fileCheckCount++;
+	if (argv["limit-file-checks"] && (this._fileCheckCount > 10)) {
+	    // Flip whether the file exists or not to see if that
+	    // breaks a loop.
+	    value = !value;
+	    // Might break emulation based on WScript.quit(). Stop
+	    // ignoring WScript.quit().
+	    lib.doWscriptQuit(true);
+	}
         lib.logIOC("FileExists", path, "The script checked to see if a file exists.");
 	return value;
     };
     this.folderexists = (path) => {
-	const value = !argv["no-folder-exists"];
+	var value = !argv["no-folder-exists"];
 	if (value) {
 	    lib.info(`Returning true for FileSystemObject.FolderExists(${path}); use --no-folder-exists if nothing happens`);
 	}
+	if (typeof(this._fileCheckCount) == "undefined") this._fileCheckCount = 0;
+	this._fileCheckCount++;
+	if (argv["limit-file-checks"] && (this._fileCheckCount > 500)) {
+	    // Flip whether the file exists or not to see if that
+	    // breaks a loop.
+	    value = !value;
+	    // Might break emulation based on WScript.quit(). Stop
+	    // ignoring WScript.quit().
+	    lib.doWscriptQuit(true);
+	}	
         lib.logIOC("FolderExists", path, "The script checked to see if a folder exists.");
 	return value;
     };

flags.json

@@ -122,6 +122,11 @@
             "type": "Boolean",
             "description": "Return `false` for Scripting.FileSystemObject.FileExists(x)"
         },
+	{
+            "name": "limit-file-checks",
+            "type": "Boolean",
+            "description": "Switch default value for folder/file exists checks if many checks are performed (try to break infinite file check loops)."
+        },	
         {
             "name": "no-folder-exists",
             "type": "Boolean",

lib.js

@@ -184,13 +184,20 @@ function noCasePropObj(obj)
     return newObj; // object with upper cased keys
 };
 
+_doWscriptQuit = false;
+function doWscriptQuit(flag) {
+    if (typeof(flag) != "undefined") _doWscriptQuit = flag;
+    return _doWscriptQuit;
+}
+
 module.exports = {
     argv,
     kill,
     getUUID,
     throttleFileWrites,
     throttleCommands,
     noCasePropObj,
+    doWscriptQuit,
 
     debug: log.bind(null, "debug"),
     verbose: log.bind(null, "verb"),

patch.js

@@ -3,8 +3,10 @@ let __PATCH_CODE_ADDED__ = true;
 window = this;
 
 _globalTimeOffset = 0;
+_sleepCount = 0;
 WScript.sleep = function(delay) {
     _globalTimeOffset += delay;
+    _sleepCount++;
 }
 
 let fullYearGetter = Date.prototype.getFullYear;