Rust: Import unsafe funcs

pkgs/rust/kernaux/src/lib.rs

@@ -1 +1,3 @@
+mod ntoa;
 
+pub use ntoa::*;

pkgs/rust/kernaux/src/ntoa.rs

@@ -0,0 +1,15 @@
+#[cfg(test)]
+mod tests {
+    use std::ffi::CStr;
+
+    use kernaux_sys::{utoa10, UTOA10_BUFFER_SIZE};
+
+    #[test]
+    fn test_utoa10() {
+        let mut buffer: [i8; UTOA10_BUFFER_SIZE] = [0; UTOA10_BUFFER_SIZE];
+        unsafe { utoa10(123, buffer.as_mut_ptr()) };
+        let result =
+            unsafe { CStr::from_ptr(buffer.as_ptr()) }.to_str().unwrap();
+        assert_eq!(result, "123");
+    }
+}