[refactor] Split the message macro in a standalone library for reuse
This simplifies the task of creating an independent library of
rkpd_client later.
Test: atest keystore2_test
Bug: 241428146
Change-Id: Idddf37d14580e691fde5a494e54297465cb693b6
diff --git a/keystore2/message_macro/src/lib.rs b/keystore2/message_macro/src/lib.rs
new file mode 100644
index 0000000..d8cfab0
--- /dev/null
+++ b/keystore2/message_macro/src/lib.rs
@@ -0,0 +1,35 @@
+// Copyright 2020, The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! A macro that generates a message containing the current source file name
+//! and line number.
+
+/// Generates a message containing the current source file name and line number.
+///
+/// # Examples
+///
+/// ```
+/// source_location_msg!("Key is expired.");
+/// Result:
+/// "src/lib.rs:7 Key is expired."
+/// ```
+#[macro_export]
+macro_rules! source_location_msg {
+ { $($arg:tt)+ } => {
+ format!("{}:{}: {}", file!(), line!(), format_args!($($arg)+))
+ };
+ {} => {
+ format!("{}:{}", file!(), line!())
+ };
+}