confid: Clean up structs

umskt/src/confid/mod.rs

@@ -1,5 +1,3 @@
-use std::ffi::{CStr, CString};
-
 use thiserror::Error;
 
 mod black_box;
@@ -27,9 +25,9 @@ pub fn generate(installation_id: &str) -> Result<String, ConfirmationIdError> {
     if installation_id.len() > 54 {
         return Err(ConfirmationIdError::TooLarge);
     }
-    let inst_id = CString::new(installation_id).unwrap();
-    let conf_id = [0u8; 49];
-    let result = unsafe { black_box::generate(inst_id.as_ptr(), conf_id.as_ptr() as *mut i8) };
+    let inst_id = installation_id.as_bytes();
+    let mut conf_id = [0u8; 48];
+    let result = black_box::generate(inst_id, &mut conf_id);
     match result {
         0 => {}
         1 => return Err(ConfirmationIdError::TooShort),
@@ -40,12 +38,7 @@ pub fn generate(installation_id: &str) -> Result<String, ConfirmationIdError> {
         6 => return Err(ConfirmationIdError::Unlucky),
         _ => panic!("Unknown error code: {}", result),
     }
-    unsafe {
-        Ok(CStr::from_ptr(conf_id.as_ptr() as *const i8)
-            .to_str()
-            .unwrap()
-            .to_string())
-    }
+    Ok(String::from_utf8_lossy(&conf_id).into())
 }
 
 #[cfg(test)]