From c5274a56b8a306fd184e80bd023824e623c56c27 Mon Sep 17 00:00:00 2001
From: mrbesen <y.g.2@gmx.de>
Date: Sun, 19 Nov 2023 17:26:04 +0100
Subject: [PATCH] print errno

---
 Log.cpp | 7 +++++++
 Log.h   | 6 ++++++
 2 files changed, 13 insertions(+)

diff --git a/Log.cpp b/Log.cpp
index 3ba56d7..4f54549 100644
--- a/Log.cpp
+++ b/Log.cpp
@@ -2,6 +2,7 @@
 
 #include <array>
 #include <chrono>   // date/time
+#include <cstring>
 #include <fstream>  // ofstream (logging to file)
 #include <iostream> // std::ostream, std::cout, std::cin
 #include <memory>   // std::unique_ptr
@@ -284,6 +285,12 @@ void setColoredOutput(bool enabled) {
 	dynamic_cast<ConsoleOutput&>(*outputs.at(0)).setColoredOutput(enabled); // has to exist
 }
 
+const PrintErrno err;
+
+std::ostream& operator<<(std::ostream& str, const PrintErrno&) {
+	return str << strerror(errno) << " (" << errno << ')';
+}
+
 std::ostream& operator<<(std::ostream& str, const FileSize& fs) {
 	static const char PREFIX[] {' ', 'K', 'M', 'G', 'T', 'P', 'E'};
 	static const uint_fast8_t PREFIXCOUNT = 7;
diff --git a/Log.h b/Log.h
index 144fb58..b426a0e 100644
--- a/Log.h
+++ b/Log.h
@@ -127,6 +127,12 @@ private:
 	friend std::ostream& operator<<(std::ostream& str, const FileSize& fs);
 };
 
+struct PrintErrno {};
+
+extern const PrintErrno err;
+
+std::ostream& operator<<(std::ostream& str, const PrintErrno&);
+
 std::ostream& operator<<(std::ostream& str, const FileSize& fs);
 
 // copy Level values in Log namespace