From c23ac0545c7828f1b9661f00b83647dbc529669c Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Fri, 28 Dec 2018 02:41:41 +0100
Subject: gui/init: output to MSVC debugger if attached

---
 gui/init.cpp | 46 +++++++++++++++++++++++++++++++++-------------
 1 file changed, 33 insertions(+), 13 deletions(-)

(limited to 'gui')

diff --git a/gui/init.cpp b/gui/init.cpp
index e30df777..9e6b79dc 100644
--- a/gui/init.cpp
+++ b/gui/init.cpp
@@ -95,20 +95,39 @@ static void set_qt_style()
 
 #ifdef _WIN32
 
+#include <atomic>
+#include <cstring>
+#include <cwchar>
+#include <windows.h>
+
 static void qdebug_to_console(QtMsgType, const QMessageLogContext& ctx, const QString &msg)
 {
-    const unsigned short* const str_ = msg.utf16();
-    const auto str = reinterpret_cast<wchar_t const*>(str_);
-    static_assert(sizeof(*str_) == sizeof(*str));
-
-    std::fflush(stderr);
-    if (ctx.function)
-        std::fprintf(stderr, "[%s:%d%s]: %ls\n", ctx.file, ctx.line, ctx.function, str);
-    else if (ctx.file)
-        std::fprintf(stderr, "[%s:%d]: %ls\n", ctx.file, ctx.line, str);
+    const auto str = (const wchar_t*)msg.utf16();
+    static_assert(sizeof(*str) == sizeof(wchar_t));
+
+    if (IsDebuggerPresent())
+    {
+        static std::atomic_flag lock = ATOMIC_FLAG_INIT;
+
+        while (!lock.test_and_set())
+            (void)0;
+
+        OutputDebugStringW(str);
+        OutputDebugStringW(L"\n");
+
+        lock.clear();
+    }
     else
-        std::fprintf(stderr, "%ls\n", str);
-    std::fflush(stderr);
+    {
+        std::fflush(stderr);
+        if (ctx.function)
+            std::fprintf(stderr, "[%s:%d%s]: %ls\n", ctx.file, ctx.line, ctx.function, str);
+        else if (ctx.file)
+            std::fprintf(stderr, "[%s:%d]: %ls\n", ctx.file, ctx.line, str);
+        else
+            std::fprintf(stderr, "%ls\n", str);
+        std::fflush(stderr);
+    }
 }
 
 static void add_win32_path()
@@ -161,10 +180,11 @@ static void add_win32_path()
     }
 }
 
-#include <windows.h>
-
 static void attach_parent_console()
 {
+    if (GetConsoleWindow() != nullptr)
+        return;
+
     fflush(stdin);
     fflush(stderr);
 
-- 
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