diff --git a/sakura_core/debug/Debug1.cpp b/sakura_core/debug/Debug1.cpp
index f53b5b7b2c..b745d18012 100644
--- a/sakura_core/debug/Debug1.cpp
+++ b/sakura_core/debug/Debug1.cpp
@@ -21,6 +21,8 @@
 #include <stdio.h>
 #include <stdarg.h>
 
+#include "util/string_ex.h"
+
 #if defined(_DEBUG) || defined(USE_RELPRINT)
 
 // -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- //
@@ -54,13 +56,8 @@ void DebugOutW( LPCWSTR lpFmt, ...)
 
 		::DebugBreak();
 
-		const int count = _vscwprintf( lpFmt, argList );
-
 		std::wstring strTooLongMessage;
-		strTooLongMessage.reserve( count );
-
-		::_vsnwprintf_s( strTooLongMessage.data(), count + 1, _TRUNCATE, lpFmt, argList );
-		strTooLongMessage.assign( strTooLongMessage.data(), count );
+		vstrprintf( strTooLongMessage, lpFmt, argList );
 
 		::OutputDebugStringW( strTooLongMessage.c_str() );
 	}
diff --git a/sakura_core/util/string_ex.h b/sakura_core/util/string_ex.h
index 263ea4d460..d0c41273b5 100644
--- a/sakura_core/util/string_ex.h
+++ b/sakura_core/util/string_ex.h
@@ -26,6 +26,8 @@
 #define SAKURA_STRING_EX_87282FEB_4B23_4112_9C5A_419F43618705_H_
 #pragma once
 
+#include <string>
+
 // 2007.10.19 kobake
 // string.h で定義されている関数を拡張したようなモノ達
 
@@ -200,6 +202,51 @@ inline int auto_vsprintf(WCHAR* buf, const WCHAR* format, va_list& v){ return tc
 inline int auto_vsprintf_s(ACHAR* buf, size_t nBufCount, const ACHAR* format, va_list& v){ return tchar_vsprintf_s(buf, nBufCount, format, v); }
 inline int auto_vsprintf_s(WCHAR* buf, size_t nBufCount, const WCHAR* format, va_list& v){ return tchar_vsprintf_s(buf, nBufCount, format, v); }
 
+template<typename ChType>
+inline int vstrprintf( std::basic_string<ChType>& strOut, const ChType* pszFormat, va_list& argList )
+{
+	static_assert( 0, "not implemented" );
+	return -1;
+}
+
+template<typename ChType>
+inline int strprintf( std::basic_string<ChType>& strOut, const ChType* pszFormat, ... )
+{
+	static_assert( 0, "not implemented" );
+	return -1;
+}
+
+template<>
+inline int vstrprintf<WCHAR>( std::wstring& strOut, const WCHAR* pszFormat, va_list& argList )
+{
+	strOut.clear();
+
+	const int cchOut = _vscwprintf( pszFormat, argList );
+	if( cchOut > 0 ){
+
+		strOut.reserve( cchOut );
+
+		::vswprintf_s( strOut.data(), strOut.capacity(), pszFormat, argList );
+
+		strOut.assign( strOut.data(), cchOut );
+	}
+
+	return cchOut;
+}
+
+template<>
+inline int strprintf<WCHAR>( std::wstring& strOut, const WCHAR* pszFormat, ... )
+{
+	va_list argList;
+	va_start( argList, pszFormat );
+
+	const int nRet = vstrprintf( strOut, pszFormat, argList );
+
+	va_end( argList );
+
+	return nRet;
+}
+
 // -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- //
 //                      文字コード変換                         //
 // -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- //
diff --git a/tests/unittests/test-int2dec.cpp b/tests/unittests/test-int2dec.cpp
index 96d532c5df..148737648d 100644
--- a/tests/unittests/test-int2dec.cpp
+++ b/tests/unittests/test-int2dec.cpp
@@ -1,79 +1,42 @@
-#include <gtest/gtest.h>
+/*! @file */
+/*
+	Copyright (C) 2018-2020 Sakura Editor Organization
 
-#include <limits>
+	This software is provided 'as-is', without any express or implied
+	warranty. In no event will the authors be held liable for any damages
+	arising from the use of this software.
 
-#ifndef NOMINMAX
-#define NOMINMAX
-#endif /* #ifndef NOMINMAX */
-
-#include <Windows.h>
-#include <tchar.h>
-#include "basis/primitive.h"
-#include "util/string_ex2.h"
+	Permission is granted to anyone to use this software for any purpose,
+	including commercial applications, and to alter it and redistribute it
+	freely, subject to the following restrictions:
 
-template <typename T>
-void test_int2dec(T value, ptrdiff_t lenExpected, const wchar_t* strExpected)
-{
-	wchar_t buff[int2dec_destBufferSufficientLength<T>()];
-	ptrdiff_t len = int2dec(value, buff);
-	EXPECT_EQ(len, lenExpected);
-	EXPECT_STREQ(buff, strExpected);
-}
+		1. The origin of this software must not be misrepresented;
+		   you must not claim that you wrote the original software.
+		   If you use this software in a product, an acknowledgment
+		   in the product documentation would be appreciated but is
+		   not required.
 
-template <typename T>
-void test_plusminus(T plusValue, ptrdiff_t lenExpected, const wchar_t* strExpected)
-{
-	test_int2dec(plusValue, lenExpected, strExpected);
-	test_int2dec(-plusValue, 1+lenExpected, (std::wstring(L"-")+strExpected).c_str());
-}
-
-static
-void test_32_64_plus_minus(int value, ptrdiff_t lenExpected, const wchar_t* strExpected)
-{
-	test_plusminus<int32_t>(value, lenExpected, strExpected);
-	test_plusminus<int64_t>(value, lenExpected, strExpected);
-}
+		2. Altered source versions must be plainly marked as such,
+		   and must not be misrepresented as being the original software.
 
-TEST(int2dec_test, zero)
-{
-	test_int2dec<int32_t>(0, 1, L"0");
-	test_int2dec<int64_t>(0, 1, L"0");
-}
+		3. This notice may not be removed or altered from any source
+		   distribution.
+*/
+#include <gtest/gtest.h>
 
-TEST(int2dec_test, digits)
-{
-	test_32_64_plus_minus(2, 1, L"2");
-	test_32_64_plus_minus(3, 1, L"3");
-	test_32_64_plus_minus(4, 1, L"4");
-	test_32_64_plus_minus(5, 1, L"5");
-	test_32_64_plus_minus(6, 1, L"6");
-	test_32_64_plus_minus(7, 1, L"7");
-	test_32_64_plus_minus(8, 1, L"8");
-	test_32_64_plus_minus(9, 1, L"9");
-}
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif /* #ifndef NOMINMAX */
 
-TEST(int2dec_test, max)
-{
-	test_int2dec<int32_t>(std::numeric_limits<int32_t>::max(), 10, L"2147483647");
-	test_int2dec<int64_t>(std::numeric_limits<int64_t>::max(), 19, L"9223372036854775807");
-}
+#include <tchar.h>
+#include <Windows.h>
 
-TEST(int2dec_test, min)
-{
-	test_int2dec<int32_t>(std::numeric_limits<int32_t>::min(), 11, L"-2147483648");
-	test_int2dec<int64_t>(std::numeric_limits<int64_t>::min(), 20, L"-9223372036854775808");
-}
+#include "basis/primitive.h"
+#include "util/string_ex.h"
 
-TEST(int2dec_test, group_sequence)
+TEST(string_ex, strprintf)
 {
-	test_32_64_plus_minus(1, 1, L"1");
-	test_32_64_plus_minus(12, 2, L"12");
-	test_32_64_plus_minus(123, 3, L"123");
-	test_32_64_plus_minus(1234, 4, L"1234");
-	test_32_64_plus_minus(12345, 5, L"12345");
-	test_32_64_plus_minus(123456, 6, L"123456");
-	test_32_64_plus_minus(1234567, 7, L"1234567");
-	test_32_64_plus_minus(12345678, 8, L"12345678");
-	test_32_64_plus_minus(123456789, 9, L"123456789");
-	test_32_64_plus_minus(1234567890, 10, L"1234567890");
+	std::wstring text;
+	strprintf( text, L"%s-%d", L"test", 1 );
+	ASSERT_STREQ(L"test-1", text.c_str());
 }
diff --git a/tests/unittests/test-string_ex.cpp b/tests/unittests/test-string_ex.cpp
new file mode 100644
index 0000000000..96d532c5df
--- /dev/null
+++ b/tests/unittests/test-string_ex.cpp
@@ -0,0 +1,79 @@
+#include <gtest/gtest.h>
+
+#include <limits>
+
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif /* #ifndef NOMINMAX */
+
+#include <Windows.h>
+#include <tchar.h>
+#include "basis/primitive.h"
+#include "util/string_ex2.h"
+
+template <typename T>
+void test_int2dec(T value, ptrdiff_t lenExpected, const wchar_t* strExpected)
+{
+	wchar_t buff[int2dec_destBufferSufficientLength<T>()];
+	ptrdiff_t len = int2dec(value, buff);
+	EXPECT_EQ(len, lenExpected);
+	EXPECT_STREQ(buff, strExpected);
+}
+
+template <typename T>
+void test_plusminus(T plusValue, ptrdiff_t lenExpected, const wchar_t* strExpected)
+{
+	test_int2dec(plusValue, lenExpected, strExpected);
+	test_int2dec(-plusValue, 1+lenExpected, (std::wstring(L"-")+strExpected).c_str());
+}
+
+static
+void test_32_64_plus_minus(int value, ptrdiff_t lenExpected, const wchar_t* strExpected)
+{
+	test_plusminus<int32_t>(value, lenExpected, strExpected);
+	test_plusminus<int64_t>(value, lenExpected, strExpected);
+}
+
+TEST(int2dec_test, zero)
+{
+	test_int2dec<int32_t>(0, 1, L"0");
+	test_int2dec<int64_t>(0, 1, L"0");
+}
+
+TEST(int2dec_test, digits)
+{
+	test_32_64_plus_minus(2, 1, L"2");
+	test_32_64_plus_minus(3, 1, L"3");
+	test_32_64_plus_minus(4, 1, L"4");
+	test_32_64_plus_minus(5, 1, L"5");
+	test_32_64_plus_minus(6, 1, L"6");
+	test_32_64_plus_minus(7, 1, L"7");
+	test_32_64_plus_minus(8, 1, L"8");
+	test_32_64_plus_minus(9, 1, L"9");
+}
+
+TEST(int2dec_test, max)
+{
+	test_int2dec<int32_t>(std::numeric_limits<int32_t>::max(), 10, L"2147483647");
+	test_int2dec<int64_t>(std::numeric_limits<int64_t>::max(), 19, L"9223372036854775807");
+}
+
+TEST(int2dec_test, min)
+{
+	test_int2dec<int32_t>(std::numeric_limits<int32_t>::min(), 11, L"-2147483648");
+	test_int2dec<int64_t>(std::numeric_limits<int64_t>::min(), 20, L"-9223372036854775808");
+}
+
+TEST(int2dec_test, group_sequence)
+{
+	test_32_64_plus_minus(1, 1, L"1");
+	test_32_64_plus_minus(12, 2, L"12");
+	test_32_64_plus_minus(123, 3, L"123");
+	test_32_64_plus_minus(1234, 4, L"1234");
+	test_32_64_plus_minus(12345, 5, L"12345");
+	test_32_64_plus_minus(123456, 6, L"123456");
+	test_32_64_plus_minus(1234567, 7, L"1234567");
+	test_32_64_plus_minus(12345678, 8, L"12345678");
+	test_32_64_plus_minus(123456789, 9, L"123456789");
+	test_32_64_plus_minus(1234567890, 10, L"1234567890");
+}
diff --git a/tests/unittests/tests1.vcxproj b/tests/unittests/tests1.vcxproj
index 2da2e36862..7106bff7db 100644
--- a/tests/unittests/tests1.vcxproj
+++ b/tests/unittests/tests1.vcxproj
@@ -1,146 +1,147 @@
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-  <ItemGroup Label="ProjectConfigurations">
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-    </ProjectConfiguration>
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-      <Configuration>Release</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Debug|x64">
-      <Configuration>Debug</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|x64">
-      <Configuration>Release</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
-  </ItemGroup>
-  <PropertyGroup Label="Globals">
-    <ProjectGuid>{701e3407-ec27-49f7-adc7-520cf2b4b438}</ProjectGuid>
-    <Keyword>Win32Proj</Keyword>
-  </PropertyGroup>
-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
-  <Import Project="$(ProjectDir)..\..\vcx-props\vcxcompat.props" />
-  <PropertyGroup Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-    <CharacterSet>Unicode</CharacterSet>
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-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
-  <ImportGroup Label="ExtensionSettings" />
-  <ImportGroup Label="Shared" />
-  <ImportGroup Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-  </ImportGroup>
-  <PropertyGroup Label="UserMacros">
-    <OutDir>(ProjectDir)..\..\..\build\$(Platform)\$(Configuration)\unittests\</OutDir>
-    <IntDir>$(Platform)\$(Configuration)\</IntDir>
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-  <Import Project="$(ProjectDir)..\googletest.targets" />
-  <Import Project="$(ProjectDir)..\compiletests.targets" />
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-    <ClCompile>
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-    </ClCompile>
-    <Link>
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-    <ClCompile Include="test-cdlgprofilemgr.cpp" />
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+<?xml version="1.0" encoding="utf-8"?>
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+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
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+      <Platform>x64</Platform>
+    </ProjectConfiguration>
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+    <OutDir>(ProjectDir)..\..\..\build\$(Platform)\$(Configuration)\unittests\</OutDir>
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+    <ClCompile>
+      <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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+    <Link>
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+    </Link>
+  </ItemDefinitionGroup>
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+    <ClCompile>
+      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
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+    </ClCompile>
+    <Link>
+      <LinkTimeCodeGeneration>UseFastLinkTimeCodeGeneration</LinkTimeCodeGeneration>
+      <OptimizeReferences>true</OptimizeReferences>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Platform)'=='Win32'">
+    <ClCompile>
+      <PreprocessorDefinitions>WIN32;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <LargeAddressAware>true</LargeAddressAware>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Platform)'=='x64'">
+    <ClCompile>
+      <PreprocessorDefinitions>X64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+  </ItemDefinitionGroup>
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+  </ItemDefinitionGroup>
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+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
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+    <Link Include="$(SolutionDir)sakura\$(Platform)\$(Configuration)\*.obj" />
+    <Link Include="$(SolutionDir)sakura\$(Platform)\$(Configuration)\*.res" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="code-main.cpp" />
+    <ClCompile Include="test-ccommandline.cpp" />
+    <ClCompile Include="test-cdlgprofilemgr.cpp" />
+    <ClCompile Include="test-clayoutint.cpp" />
+    <ClCompile Include="test-cmemory.cpp" />
+    <ClCompile Include="test-cnative.cpp" />
+    <ClCompile Include="test-cprofile.cpp" />
+    <ClCompile Include="test-editinfo.cpp" />
+    <ClCompile Include="test-grepinfo.cpp" />
+    <ClCompile Include="test-int2dec.cpp" />
+    <ClCompile Include="test-is_mailaddress.cpp" />
+    <ClCompile Include="test-loadstring.cpp" />
+    <ClCompile Include="test-mydevmode.cpp" />
+    <ClCompile Include="test-parameterized.cpp" />
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+    <ClCompile Include="test-sample.cpp" />
+    <ClCompile Include="test-ssearchoption.cpp" />
+    <ClCompile Include="test-StdControl.cpp" />
+    <ClCompile Include="test-string_ex.cpp" />
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+  <ItemGroup>
+    <Text Include="CMakeLists.txt" />
+  </ItemGroup>
+  <ItemGroup Condition="Exists('$(VCInstallDir)\Auxiliary\VS\include\CodeCoverage\CodeCoverage.h')">
+    <ClCompile Include="coverage.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="$(ProjectDir)..\..\sakura\sakura.vcxproj">
+      <Project>{af03508c-515e-4a0e-87be-67ed1e254bd0}</Project>
+    </ProjectReference>
+    <ProjectReference Include="..\..\sakura_lang_en_US\sakura_lang_en_US.vcxproj">
+      <Project>{7a6d0f29-e560-4985-835b-5f92a08eb242}</Project>
+    </ProjectReference>
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+  <ItemGroup>
+    <ClInclude Include="StartEditorProcessForTest.h" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
 </Project>
\ No newline at end of file
diff --git a/tests/unittests/tests1.vcxproj.filters b/tests/unittests/tests1.vcxproj.filters
index 0ffb1ec742..87f26be228 100644
--- a/tests/unittests/tests1.vcxproj.filters
+++ b/tests/unittests/tests1.vcxproj.filters
@@ -1,86 +1,89 @@
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+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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+      <UniqueIdentifier>{0eefa0df-ca7f-489c-9844-9a182e1dba18}</UniqueIdentifier>
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+      <Filter>Test Files</Filter>
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+    <ClCompile Include="test-cnative.cpp">
+      <Filter>Test Files</Filter>
+    </ClCompile>
+    <ClCompile Include="test-int2dec.cpp">
+      <Filter>Test Files</Filter>
+    </ClCompile>
+    <ClCompile Include="test-is_mailaddress.cpp">
+      <Filter>Test Files</Filter>
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+    <ClCompile Include="test-mydevmode.cpp">
+      <Filter>Test Files</Filter>
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+    <ClCompile Include="test-parameterized.cpp">
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+      <Filter>Test Files</Filter>
+    </ClCompile>
+    <ClCompile Include="test-editinfo.cpp">
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 </Project>
\ No newline at end of file