minion_rs/
wrappers.rs

1//! Small wrapper functions over FFI things.
2
3use std::ffi::{c_char, CStr, CString};
4
5use crate::ffi;
6use libc::free;
7
8/// Gets a given value from Minion's TableOut (where it stores run statistics).
9pub fn get_from_table(key: String) -> Option<String> {
10    unsafe {
11        #[allow(clippy::expect_used)]
12        let c_string = CString::new(key).expect("");
13        let key_ptr = c_string.into_raw();
14        let val_ptr: *mut c_char = ffi::TableOut_get(key_ptr);
15
16        drop(CString::from_raw(key_ptr));
17
18        if val_ptr.is_null() {
19            free(val_ptr as _);
20            None
21        } else {
22            #[allow(clippy::unwrap_used)]
23            // CStr borrows the string in the ptr.
24            // We convert it to &str then clone into a String.
25            let res = CStr::from_ptr(val_ptr).to_str().unwrap().to_owned();
26            free(val_ptr as _);
27            Some(res)
28        }
29    }
30}