From 0e0551db6b3650a7334dc23829b65ec63b5bc485 Mon Sep 17 00:00:00 2001
From: Simon Rozman <simon.rozman@amebis.si>
Date: Tue, 20 Jan 2026 08:48:00 +0100
Subject: [PATCH] debug: convert UTF-8 to ACP on Windows

Our source code assumes all-UTF-8 strings, on Windows the 8-bit active
code page is admin-adjustable. Hence we need to convert at runtime.

Signed-off-by: Simon Rozman <simon.rozman@amebis.si>
---
 include/stdex/debug.hpp | 27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/include/stdex/debug.hpp b/include/stdex/debug.hpp
index c0d715d6e..a3f94e8e6 100644
--- a/include/stdex/debug.hpp
+++ b/include/stdex/debug.hpp
@@ -7,6 +7,7 @@
 
 #include "compat.hpp"
 #include "string.hpp"
+#include "unicode.hpp"
 #include <stdarg.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -22,8 +23,15 @@ namespace stdex
 			_Unreferenced_(format);
 			_Unreferenced_(arg);
 #elif defined(_WIN32)
-			auto tmp = stdex::vsprintf(format, stdex::locale_default, arg);
-			OutputDebugStringA(tmp.c_str());
+			auto tmp = stdex::vsprintf(format, stdex::locale_utf8, arg);
+			auto cp = static_cast<stdex::charset_id>(GetACP());
+			if (cp != stdex::charset_id::utf8) {
+				auto tmpW = stdex::str2wstr(tmp, stdex::charset_id::utf8);
+				auto tmpA = stdex::wstr2str(tmpW, cp);
+				OutputDebugStringA(tmpA.c_str());
+			}
+			else
+				OutputDebugStringA(tmp.c_str());
 #else
 			vfprintf(stdout, format, arg);
 #endif
@@ -35,7 +43,7 @@ namespace stdex
 			_Unreferenced_(format);
 			_Unreferenced_(arg);
 #elif defined(_WIN32)
-			auto tmp = stdex::vsprintf(format, stdex::locale_default, arg);
+			auto tmp = stdex::vsprintf(format, stdex::locale_utf8, arg);
 			OutputDebugStringW(tmp.c_str());
 #else
 			vfwprintf(stdout, format, arg);
@@ -74,8 +82,15 @@ namespace stdex
 			_Unreferenced_(format);
 			_Unreferenced_(arg);
 #elif defined(_WIN32)
-			auto tmp = stdex::vsprintf(format, stdex::locale_default, arg);
-			OutputDebugStringA(tmp.c_str());
+			auto tmp = stdex::vsprintf(format, stdex::locale_utf8, arg);
+			auto cp = static_cast<stdex::charset_id>(GetACP());
+			if (cp != stdex::charset_id::utf8) {
+				auto tmpW = stdex::str2wstr(tmp, stdex::charset_id::utf8);
+				auto tmpA = stdex::wstr2str(tmpW, cp);
+				OutputDebugStringA(tmpA.c_str());
+			}
+			else
+				OutputDebugStringA(tmp.c_str());
 #else
 			vfprintf(stderr, format, arg);
 #endif
@@ -87,7 +102,7 @@ namespace stdex
 			_Unreferenced_(format);
 			_Unreferenced_(arg);
 #elif defined(_WIN32)
-			auto tmp = stdex::vsprintf(format, stdex::locale_default, arg);
+			auto tmp = stdex::vsprintf(format, stdex::locale_utf8, arg);
 			OutputDebugStringW(tmp.c_str());
 #else
 			vfwprintf(stderr, format, arg);