Changes to be committed:

modified:   src/lib.rs

src/lib.rs

@@ -1,3 +1,18 @@
+use std::os::raw::{c_char};
+use std::ffi::{CString, CStr};
+
+#[no_mangle]
+pub extern fn rust_greeting(to: *const c_char) -> *mut c_char {
+    let c_str = unsafe { CStr::from_ptr(to) };
+    let recipient = match c_str.to_str() {
+        Err(_) => "there",
+        Ok(string) => string,
+    };
+
+    CString::new("Hello ".to_owned() + recipient).unwrap().into_raw()
+}
+
+
 #[cfg(target_os="android")]
 #[allow(non_snake_case)]
 pub mod android {
@@ -11,7 +26,7 @@ pub mod android {
     #[no_mangle]
     pub unsafe extern fn Java_com_alterdekim_frida_FridaVPN_greeting(env: JNIEnv, _: JClass, java_pattern: JString) -> jstring {
         // Our Java companion code might pass-in "world" as a string, hence the name.
-        let world = rust_greeting(env.get_string(java_pattern).expect("invalid pattern string").as_ptr());
+        let world = rust_greeting(env.get_string(&java_pattern).expect("invalid pattern string").as_ptr());
         // Retake pointer so that we can use it below and allow memory to be freed when it goes out of scope.
         let world_ptr = CString::from_raw(world);
         let output = env.new_string(world_ptr.to_str().unwrap()).expect("Couldn't create java string!");