1 files changed, 80 insertions, 0 deletions
diff --git a/include/ricochet/net/sys/exception.hh b/include/ricochet/net/sys/exception.hh
new file mode 100644
index 0000000..9587e5c
--- /dev/null
+++ b/include/ricochet/net/sys/exception.hh
@@ -0,0 +1,80 @@
+/**
+ * ---------------------------------------------------------------------------
+ * @notice This file was adapted from the Minnow networking framework,
+ * originally developed for Stanford University's CS144 course.
+ * It has been incorporated into the Ricochet project as foundational
+ * system utility code.
+ * ---------------------------------------------------------------------------
+ */
+
+#pragma once
+
+#include <cxxabi.h>
+#include <memory>
+#include <string>
+#include <string_view>
+#include <system_error>
+
+class tagged_error : public std::system_error
+{
+private:
+  std::string attempt_and_error_;
+  int error_code_;
+
+public:
+  tagged_error( const std::error_category& category, const std::string_view s_attempt, const int error_code )
+    : system_error( error_code, category )
+    , attempt_and_error_( std::string( s_attempt ) + ": " + std::system_error::what() )
+    , error_code_( error_code )
+  {}
+
+  const char* what() const noexcept override { return attempt_and_error_.c_str(); }
+
+  int error_code() const { return error_code_; }
+};
+
+class unix_error : public tagged_error
+{
+public:
+  explicit unix_error( const std::string_view s_attempt, const int s_errno = errno )
+    : tagged_error( std::system_category(), s_attempt, s_errno )
+  {}
+};
+
+inline int CheckSystemCall( const std::string_view s_attempt, const int return_value )
+{
+  if ( return_value >= 0 ) {
+    return return_value;
+  }
+
+  throw unix_error { s_attempt };
+}
+
+template<typename T>
+inline T* notnull( const std::string_view context, T* const x )
+{
+  return x ? x : throw std::runtime_error( std::string( context ) + ": returned null pointer" );
+}
+
+template<typename T>
+inline std::unique_ptr<T> notnull( const std::string_view context, std::unique_ptr<T> x )
+{
+  return x ? x : throw std::runtime_error( std::string( context ) + ": returned null pointer" );
+}
+
+template<typename T>
+inline std::shared_ptr<T> notnull( const std::string_view context, std::shared_ptr<T>&& x )
+{
+  return x ? std::move( x ) : throw std::runtime_error( std::string( context ) + ": returned null pointer" );
+}
+
+inline std::string demangle( const char* name )
+{
+  int status {};
+  const std::unique_ptr<char, decltype( &free )> res { abi::__cxa_demangle( name, nullptr, nullptr, &status ),
+                                                       free };
+  if ( status ) {
+    throw std::runtime_error( "cxa_demangle" );
+  }
+  return res.get();
+}