Add errno_error exception type

Signed-off-by: Simon Rozman <simon@rozman.si>

include/stdex/errno.h

@@ -0,0 +1,77 @@
+/*
+    SPDX-License-Identifier: MIT
+    Copyright © 2023 Amebis
+*/
+
+#pragma once
+
+#include "sal.h"
+#include <stdexcept>
+#include <cstring>
+
+namespace stdex
+{
+    ///
+    /// Standard C runtime library error
+    ///
+    class errno_error : public std::runtime_error
+    {
+    public:
+        ///
+        /// Constructs an exception
+        ///
+        /// \param[in] num  Numeric error code
+        /// \param[in] msg  Error message
+        ///
+        errno_error(_In_ errno_t num, _In_ const std::string& msg) :
+            m_num(num),
+            runtime_error(msg)
+        {
+        }
+
+        ///
+        /// Constructs an exception
+        ///
+        /// \param[in] num  Numeric error code
+        /// \param[in] msg  Error message
+        ///
+        errno_error(_In_ errno_t num, _In_opt_z_ const char *msg = nullptr) :
+            m_num(num),
+            runtime_error(msg)
+        {
+        }
+
+        ///
+        /// Constructs an exception using `GetLastError()`
+        ///
+        /// \param[in] msg  Error message
+        ///
+        errno_error(_In_ const std::string& msg) :
+            m_num(errno),
+            runtime_error(msg)
+        {
+        }
+
+        ///
+        /// Constructs an exception using `GetLastError()`
+        ///
+        /// \param[in] msg  Error message
+        ///
+        errno_error(_In_opt_z_ const char *msg = nullptr) :
+            m_num(errno),
+            runtime_error(msg)
+        {
+        }
+
+        ///
+        /// Returns the error number
+        ///
+        errno_t number() const
+        {
+            return m_num;
+        }
+
+    protected:
+        errno_t m_num;  ///< Numeric error code
+    };
+}