Add an exception class to cover backend creation and opening

1 files changed, 30 insertions, 0 deletions

diff --git a/common/alexcpt.cpp b/common/alexcpt.cpp
new file mode 100644
index 00000000..21508b13
--- /dev/null
+++ b/common/alexcpt.cpp
@@ -0,0 +1,30 @@
+
+#include "config.h"
+
+#include "alexcpt.h"
+
+#include <cstdio>
+#include <cstdarg>
+
+#include "opthelpers.h"
+
+
+namespace al {
+
+backend_exception::backend_exception(ALCenum code, const char *msg, ...) : mErrorCode{code}
+{
+    va_list args, args2;
+    va_start(args, msg);
+    va_copy(args2, args);
+    int msglen{std::vsnprintf(nullptr, 0, msg, args)};
+    if(UNLIKELY(msglen > 0))
+    {
+        mMessage.resize(static_cast<size_t>(msglen)+1);
+        std::vsnprintf(&mMessage[0], mMessage.length(), msg, args2);
+        mMessage.pop_back();
+    }
+    va_end(args2);
+    va_end(args);
+}
+
+} // namespace al