1 files changed, 31 insertions, 0 deletions
diff --git a/core/except.cpp b/core/except.cpp
new file mode 100644
index 00000000..07bb410a
--- /dev/null
+++ b/core/except.cpp
@@ -0,0 +1,31 @@
+
+#include "config.h"
+
+#include "except.h"
+
+#include <cstdio>
+#include <cstdarg>
+
+#include "opthelpers.h"
+
+
+namespace al {
+
+/* Defined here to avoid inlining it. */
+base_exception::~base_exception() { }
+
+void base_exception::setMessage(const char* msg, std::va_list args)
+{
+    std::va_list args2;
+    va_copy(args2, args);
+    int msglen{std::vsnprintf(nullptr, 0, msg, args)};
+    if LIKELY(msglen > 0)
+    {
+        mMessage.resize(static_cast<size_t>(msglen)+1);
+        std::vsnprintf(&mMessage[0], mMessage.length(), msg, args2);
+        mMessage.pop_back();
+    }
+    va_end(args2);
+}
+
+} // namespace al