1 files changed, 13 insertions, 23 deletions

diff --git a/lib/ShadowCopy/shadow.cpp b/lib/ShadowCopy/shadow.cpp
index bc27e2c3..c47ce983 100644
--- a/lib/ShadowCopy/shadow.cpp
+++ b/lib/ShadowCopy/shadow.cpp
@@ -10,6 +10,7 @@
 #include <zen/com_ptr.h>
 #include <zen/com_error.h>
 #include <zen/scope_guard.h>
+#include <boost/thread/tss.hpp>
 
 #ifdef USE_SHADOW_XP
 #include "xp/inc/vss.h"
@@ -74,21 +75,6 @@ std::wstring formatVssError(HRESULT hr) //at least the one's from IVssBackupComp
 }
 
 
-
-inline
-void copyString(const std::wstring& input, wchar_t* buffer, size_t bufferSize)
-{
-    if (bufferSize > 0)
-    {
-        //size_t endPos = input.copy(buffer, bufferSize - 1);
-        //buffer[endPos] = 0;
-        const size_t maxSize = std::min(input.length(), bufferSize - 1);
-        std::copy(input.begin(), input.begin() + maxSize, buffer);
-        buffer[maxSize] = 0;
-    }
-}
-
-
 shadow::ShadowData createShadowCopy(const wchar_t* volumeName) //throw ComError
 {
     ComPtr<IVssBackupComponents> backupComp;
@@ -156,12 +142,12 @@ shadow::ShadowData createShadowCopy(const wchar_t* volumeName) //throw ComError
     //finally: write volume name of newly created shadow copy
     return shadow::ShadowData(backupComp, props.m_pwszSnapshotDeviceObject);
 }
+
+boost::thread_specific_ptr<std::wstring> lastErrorMessage; //use "thread_local" in C++11
 }
 
 
-shadow::ShadowHandle shadow::createShadowCopy(const wchar_t* volumeName,
-                                              wchar_t*		 errorMessage,
-                                              unsigned int	 errorBufferLen)
+shadow::ShadowHandle shadow::createShadowCopy(const wchar_t* volumeName)
 {
     try
     {
@@ -170,17 +156,15 @@ shadow::ShadowHandle shadow::createShadowCopy(const wchar_t* volumeName,
     }
     catch (const zen::ComError& e)
     {
-        copyString(e.toString(), errorMessage, errorBufferLen);
+        lastErrorMessage.reset(new std::wstring(e.toString()));
         return nullptr;
     }
 }
 
 
-void shadow::getShadowVolume(shadow::ShadowHandle handle,
-                             wchar_t*		 buffer,
-                             unsigned int   bufferLen)
+const wchar_t* shadow::getShadowVolume(shadow::ShadowHandle handle)
 {
-    copyString(handle->shadowVolume_, buffer, bufferLen);
+    return handle ? handle->shadowVolume_.c_str() : nullptr; //better fail in client code than here!
 }
 
 
@@ -188,3 +172,9 @@ void shadow::releaseShadowCopy(ShadowHandle handle)
 {
     delete handle;
 }
+
+
+const wchar_t* shadow::getLastError()
+{
+    return !lastErrorMessage.get() ? L"" : lastErrorMessage->c_str();
+}