Add limestone.h with limestone_io_exception and limestone_exception

include/limestone/api/limestone_exception.h

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2022-2024 Project Tsurugi.
+ *
+ * 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.
+ */
+#pragma once
+
+#include <cerrno>      
+#include <cstring>     
+#include <stdexcept>
+#include <string>
+#include <iostream>
+
+namespace limestone::api {
+
+class limestone_exception : public std::runtime_error {
+public:
+    explicit limestone_exception(const std::string& message)
+        : std::runtime_error(message) {}
+
+    explicit limestone_exception(const std::string& message, int error_code)
+        : std::runtime_error(message), error_code_(error_code) {}
+
+    int error_code() const noexcept { return error_code_; }
+
+private:
+    int error_code_{0};
+};
+
+class limestone_io_exception : public limestone_exception {
+public:
+    // Constructor that takes an error message and errno as arguments
+    explicit limestone_io_exception(const std::string& message, int error_num)
+        : limestone_exception(format_message(message, error_num), error_num) {}
+
+private:
+    // Helper function to format the error message
+    static std::string format_message(const std::string& message, int error_num) {
+        // Retrieve the system error message corresponding to errno
+        std::string errno_str = std::strerror(error_num);
+
+        // Format the complete error message
+        return "I/O Error (" + errno_str + "): " + message + " (errno = " + std::to_string(error_num) + ")";
+
+    }
+};
+
+
+} // namespace limestone::api