1 files changed, 62 insertions, 0 deletions
diff --git a/al/eax/exception.cpp b/al/eax/exception.cpp
new file mode 100644
index 00000000..3b319648
--- /dev/null
+++ b/al/eax/exception.cpp
@@ -0,0 +1,62 @@
+#include "config.h"
+
+#include "exception.h"
+
+#include <cassert>
+#include <string>
+
+
+EaxException::EaxException(
+    const char* context,
+    const char* message)
+    :
+    std::runtime_error{make_message(context, message)}
+{
+}
+
+std::string EaxException::make_message(
+    const char* context,
+    const char* message)
+{
+    const auto context_size = (context ? std::string::traits_type::length(context) : 0);
+    const auto has_contex = (context_size > 0);
+
+    const auto message_size = (message ? std::string::traits_type::length(message) : 0);
+    const auto has_message = (message_size > 0);
+
+    if (!has_contex && !has_message)
+    {
+        return std::string{};
+    }
+
+    static constexpr char left_prefix[] = "[";
+    const auto left_prefix_size = std::string::traits_type::length(left_prefix);
+
+    static constexpr char right_prefix[] = "] ";
+    const auto right_prefix_size = std::string::traits_type::length(right_prefix);
+
+    const auto what_size =
+        (
+            has_contex ?
+            left_prefix_size + context_size + right_prefix_size :
+            0) +
+        message_size +
+        1;
+
+    auto what = std::string{};
+    what.reserve(what_size);
+
+    if (has_contex)
+    {
+        what.append(left_prefix, left_prefix_size);
+        what.append(context, context_size);
+        what.append(right_prefix, right_prefix_size);
+    }
+
+    if (has_message)
+    {
+        what.append(message, message_size);
+    }
+
+    return what;
+}