utf8_to_array macro

src/common/util.rs

@@ -7,5 +7,40 @@ pub fn array_to_utf8<const X: usize>(array: [u8; X]) -> Result<String, std::stri
             }
             s
         })
-
+}
+
+
+/*pub fn utf8_to_array<const X: usize>(string: String) -> Result<[u8; X], std::string::FromUtf8Error> {
+    let mut array = [0u8; X];
+    let bytes = string.as_bytes();
+    array[..bytes.len()].clone_from_slice(&bytes);
+    Ok(array)
+}*/
+
+#[macro_export]
+macro_rules! utf8_to_array {
+    ($s: expr, $size: expr) => {
+        {
+            let mut array = [0u8; $size];
+            let bytes = $s.as_bytes();
+            array[..bytes.len()].clone_from_slice(&bytes);
+            array
+        }
+    }
+}
+
+
+
+
+#[cfg(test)]
+mod test {
+    #[test]
+    fn test_utf8_to_array() {
+        let s = "asdf".to_owned();
+        let a = utf8_to_array!(s, 8);
+
+        let mut e = [0u8; 8];
+        e[..4].clone_from_slice(b"asdf");
+        assert!(a == e);
+    }
 }