android: set current dir to cache so boot.rom and file i/o are usable

src/android/app/src/main/java/org/libsdl/app/SDLActivity.java

@@ -1698,7 +1698,11 @@ class SDLMain implements Runnable {
         // Runs SDL_main()
         String library = SDLActivity.mSingleton.getMainSharedObject();
         String function = SDLActivity.mSingleton.getMainFunction();
-        String[] arguments = SDLActivity.mSingleton.getArguments();
+        String[] a = SDLActivity.mSingleton.getArguments();
+        String[] args = new String[a.length + 2];
+        System.arraycopy(a, 0, args, 0, a.length);
+        args[a.length + 0] = "-cd";
+        args[a.length + 1] = SDLActivity.mSingleton.getCacheDir().getPath();
 
         try {
             android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_DISPLAY);
@@ -1708,7 +1712,7 @@ class SDLMain implements Runnable {
 
         Log.v(SDLActivity.TAG, "Running main function " + function + " from library " + library);
 
-        SDLActivity.nativeRunMain(library, function, arguments);
+        SDLActivity.nativeRunMain(library, function, args);
 
         Log.v(SDLActivity.TAG, "Finished main function");
 

src/uxnemu.c

@@ -565,6 +565,11 @@ main(int argc, char **argv)
 				set_zoom(atoi(argv[++i]));
 			else
 				return error("Opt", "-s No scale provided.");
+		} else if(strcmp(argv[i], "-cd") == 0) {
+			if(i < argc - 1)
+				chdir(argv[++i]);
+			else
+				return error("Opt", "-cd No path provided.");
 		} else if(!loaded++) {
 			if(!start(&u, argv[i]))
 				return error("Boot", "Failed to boot.");