From f5f6292810dab70bc9be0fa4d9f37fe2b5544d86 Mon Sep 17 00:00:00 2001
From: Carl Kenner <carl.kenner@gmail.com>
Date: Fri, 5 Oct 2018 12:52:49 +0930
Subject: logging: Add DebuggerBackend for logging to Visual Studio

---
 src/common/logging/backend.cpp | 11 +++++++++--
 src/common/logging/backend.h   | 14 ++++++++++++++
 2 files changed, 23 insertions(+), 2 deletions(-)

(limited to 'src/common')

diff --git a/src/common/logging/backend.cpp b/src/common/logging/backend.cpp
index 9f5918851..31ad72f38 100644
--- a/src/common/logging/backend.cpp
+++ b/src/common/logging/backend.cpp
@@ -12,7 +12,8 @@
 #include <thread>
 #include <vector>
 #ifdef _WIN32
-#include <share.h> // For _SH_DENYWR
+#include <share.h>   // For _SH_DENYWR
+#include <windows.h> // For OutputDebugStringA
 #else
 #define _SH_DENYWR 0
 #endif
@@ -139,12 +140,18 @@ void FileBackend::Write(const Entry& entry) {
     if (!file.IsOpen() || bytes_written > MAX_BYTES_WRITTEN) {
         return;
     }
-    bytes_written += file.WriteString(FormatLogMessage(entry) + '\n');
+    bytes_written += file.WriteString(FormatLogMessage(entry).append(1, '\n'));
     if (entry.log_level >= Level::Error) {
         file.Flush();
     }
 }
 
+void DebuggerBackend::Write(const Entry& entry) {
+#ifdef _WIN32
+    ::OutputDebugStringA(FormatLogMessage(entry).append(1, '\n').c_str());
+#endif
+}
+
 /// Macro listing all log classes. Code should define CLS and SUB as desired before invoking this.
 #define ALL_LOG_CLASSES()                                                                          \
     CLS(Log)                                                                                       \
diff --git a/src/common/logging/backend.h b/src/common/logging/backend.h
index 11edbf1b6..91bb0c309 100644
--- a/src/common/logging/backend.h
+++ b/src/common/logging/backend.h
@@ -103,6 +103,20 @@ private:
     std::size_t bytes_written;
 };
 
+/**
+ * Backend that writes to Visual Studio's output window
+ */
+class DebuggerBackend : public Backend {
+public:
+    static const char* Name() {
+        return "debugger";
+    }
+    const char* GetName() const override {
+        return Name();
+    }
+    void Write(const Entry& entry) override;
+};
+
 void AddBackend(std::unique_ptr<Backend> backend);
 
 void RemoveBackend(std::string_view backend_name);
-- 
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