1 files changed, 32 insertions, 0 deletions
diff --git a/src/cppc4group.cpp b/src/cppc4group.cpp
index bacf1f7..99d5e41 100644
--- a/src/cppc4group.cpp
+++ b/src/cppc4group.cpp
@@ -2,6 +2,8 @@
 
 #include "cc4group.h"
 
+#include <cstdarg>
+
 CppC4Group::Data::Data() : data{nullptr}, size{0}
 {
 
@@ -333,6 +335,36 @@ void CppC4Group::setTmpMemoryStrategy(const TmpMemoryCallback callback)
 	cc4group.setTmpMemoryStrategy(customTmpMemoryStrategy);
 }
 
+namespace {
+
+	CppC4Group::WarningCallback cppc4group_warningCallback;
+	void CppC4Group_CustomWarningCallback(const CC4Group* const, const char* const format, ...)
+	{
+		va_list ap;
+		va_start(ap, format);
+		int size = std::vsnprintf(nullptr, 0, format, ap) + 1;
+		std::string message;
+		message.resize(size);
+		std::vsnprintf(message.data(), size, format, ap);
+		message.resize(size - 1);
+		va_end (ap);
+		cppc4group_warningCallback(message);
+	}
+}
+
+void CppC4Group::setWarningCallback(const CppC4Group::WarningCallback callback)
+{
+	if(callback == nullptr)
+	{
+		cc4group.setWarningCallback(nullptr);
+	}
+	else
+	{
+		cppc4group_warningCallback = callback;
+		cc4group.setWarningCallback(CppC4Group_CustomWarningCallback);
+	}
+}
+
 bool CppC4Group::setMaker(const std::string& maker, const std::string& path, const bool recursive)
 {
 	return cc4group.setMaker(p->g, maker.c_str(), path.c_str(), recursive);