fixing overrelease and out-of-bounds write, fixes #13725

[wxWidgets.git] / src / common / log.cpp

diff --git a/src/common/log.cpp b/src/common/log.cpp
index bafc4b84666d29593418138177214b45f2e9540e..5135eadaa33799aa29055274cdba6870b0bbdb6a 100644 (file)
--- a/src/common/log.cpp
+++ b/src/common/log.cpp
@@ -1,12 +1,12 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        log.cpp
+// Name:        src/common/log.cpp

 // Purpose:     Assorted wxLogXXX functions, and wxLog (sink for logs)
 // Author:      Vadim Zeitlin
 // Modified by:
 // Created:     29/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
 // Purpose:     Assorted wxLogXXX functions, and wxLog (sink for logs)
 // Author:      Vadim Zeitlin
 // Modified by:
 // Created:     29/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>

-// Licence:     wxWindows license
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 // ============================================================================
 /////////////////////////////////////////////////////////////////////////////
 
 // ============================================================================


@@ -16,47 +16,103 @@
 // ----------------------------------------------------------------------------
 // headers
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // headers
 // ----------------------------------------------------------------------------

-#ifdef __GNUG__
-  #pragma implementation "log.h"
-#endif

 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__

-  #pragma hdrstop
+    #pragma hdrstop

 #endif
 
 #endif
 

-// wxWindows
+#if wxUSE_LOG
+
+// wxWidgets

 #ifndef WX_PRECOMP
 #ifndef WX_PRECOMP

-  #include  <wx/event.h>
-  #include  <wx/app.h>
-  #include  <wx/string.h>
-  #include  <wx/intl.h>
-  #include  <wx/menu.h>
-  #include  <wx/frame.h>
-  #include  <wx/msgdlg.h>
-  #include  <wx/filedlg.h>
-  #include  <wx/textctrl.h>
+    #include "wx/log.h"
+    #include "wx/app.h"
+    #include "wx/arrstr.h"
+    #include "wx/intl.h"
+    #include "wx/string.h"
+    #include "wx/utils.h"

 #endif //WX_PRECOMP
 
 #endif //WX_PRECOMP
 

-#include  <wx/file.h>
-#include  <wx/textfile.h>
-#include  <wx/utils.h>
-#include  <wx/log.h>
+#include "wx/apptrait.h"
+#include "wx/datetime.h"
+#include "wx/file.h"
+#include "wx/msgout.h"
+#include "wx/textfile.h"
+#include "wx/thread.h"
+#include "wx/private/threadinfo.h"
+#include "wx/crt.h"
+#include "wx/vector.h"

 
 // other standard headers
 
 // other standard headers

-#include  <errno.h>
-#include  <stdlib.h>
-#include  <time.h>
-
-#ifdef  __WXMSW__
-  #include  <windows.h>
-  // Redefines OutputDebugString if necessary
-  #include  "wx/msw/private.h"
-#else   //Unix
-  #include  <signal.h>
-#endif  //Win/Unix
+#ifndef __WXWINCE__
+#include <errno.h>
+#endif
+
+#include <stdlib.h>
+
+#ifndef __WXWINCE__
+#include <time.h>
+#else
+#include "wx/msw/wince/time.h"
+#endif
+
+#if defined(__WINDOWS__)
+    #include "wx/msw/private.h" // includes windows.h
+#endif
+
+#undef wxLOG_COMPONENT
+const char *wxLOG_COMPONENT = "";
+
+// this macro allows to define an object which will be initialized before any
+// other function in this file is called: this is necessary to allow log
+// functions to be used during static initialization (this is not advisable
+// anyhow but we should at least try to not crash) and to also ensure that they
+// are initialized by the time static initialization is done, i.e. before any
+// threads are created hopefully
+//
+// the net effect of all this is that you can use Get##name() function to
+// access the object without worrying about it being not initialized
+//
+// see also WX_DEFINE_GLOBAL_CONV2() in src/common/strconv.cpp
+#define WX_DEFINE_GLOBAL_VAR(type, name)                                      \
+    inline type& Get##name()                                                  \
+    {                                                                         \
+        static type s_##name;                                                 \
+        return s_##name;                                                      \
+    }                                                                         \
+                                                                              \
+    type *gs_##name##Ptr = &Get##name()
+
+#if wxUSE_THREADS
+
+wxTLS_TYPE(wxThreadSpecificInfo) wxThreadInfoVar;
+
+namespace
+{
+
+// contains messages logged by the other threads and waiting to be shown until
+// Flush() is called in the main one
+typedef wxVector<wxLogRecord> wxLogRecords;
+wxLogRecords gs_bufferedLogRecords;
+
+#define WX_DEFINE_LOG_CS(name) WX_DEFINE_GLOBAL_VAR(wxCriticalSection, name##CS)
+
+// this critical section is used for buffering the messages from threads other
+// than main, i.e. it protects all accesses to gs_bufferedLogRecords above
+WX_DEFINE_LOG_CS(BackgroundLog);
+
+// this one is used for protecting TraceMasks() from concurrent access
+WX_DEFINE_LOG_CS(TraceMask);
+
+// and this one is used for GetComponentLevels()
+WX_DEFINE_LOG_CS(Levels);
+
+} // anonymous namespace
+
+#endif // wxUSE_THREADS

 
 // ----------------------------------------------------------------------------
 // non member functions
 
 // ----------------------------------------------------------------------------
 // non member functions


@@ -70,218 +126,417 @@
 #endif
 
 // ----------------------------------------------------------------------------
 #endif
 
 // ----------------------------------------------------------------------------

-// global variables
+// module globals

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-// we use a global variable to store the frame pointer for wxLogStatus - bad,
-// but it's he easiest way
-static wxFrame *gs_pFrame; // FIXME MT-unsafe
+namespace
+{
+
+// this struct is used to store information about the previous log message used
+// by OnLog() to (optionally) avoid logging multiple copies of the same message
+struct PreviousLogInfo
+{
+    PreviousLogInfo()
+    {
+        numRepeated = 0;
+    }
+
+
+    // previous message itself
+    wxString msg;
+
+    // its level
+    wxLogLevel level;
+
+    // other information about it
+    wxLogRecordInfo info;
+
+    // the number of times it was already repeated
+    unsigned numRepeated;
+};
+
+PreviousLogInfo gs_prevLog;
+
+
+// map containing all components for which log level was explicitly set
+//
+// NB: all accesses to it must be protected by GetLevelsCS() critical section
+WX_DEFINE_GLOBAL_VAR(wxStringToNumHashMap, ComponentLevels);
+
+// ----------------------------------------------------------------------------
+// wxLogOutputBest: wxLog wrapper around wxMessageOutputBest
+// ----------------------------------------------------------------------------
+
+class wxLogOutputBest : public wxLog
+{
+public:
+    wxLogOutputBest() { }
+
+protected:
+    virtual void DoLogText(const wxString& msg)
+    {
+        wxMessageOutputBest().Output(msg);
+    }
+
+private:
+    wxDECLARE_NO_COPY_CLASS(wxLogOutputBest);
+};
+
+} // anonymous namespace

 
 // ============================================================================
 // implementation
 // ============================================================================
 
 // ----------------------------------------------------------------------------
 
 // ============================================================================
 // implementation
 // ============================================================================
 
 // ----------------------------------------------------------------------------

-// implementation of Log functions
-//
-// NB: unfortunately we need all these distinct functions, we can't make them
-//     macros and not all compilers inline vararg functions.
+// helper global functions

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-// log functions can't allocate memory (LogError("out of memory...") should
-// work!), so we use a static buffer for all log messages
-#define LOG_BUFFER_SIZE   (4096)
+void wxSafeShowMessage(const wxString& title, const wxString& text)
+{
+#ifdef __WINDOWS__
+    ::MessageBox(NULL, text.t_str(), title.t_str(), MB_OK | MB_ICONSTOP);
+#else
+    wxFprintf(stderr, wxS("%s: %s\n"), title.c_str(), text.c_str());
+    fflush(stderr);
+#endif
+}

 
 

-// static buffer for error messages (FIXME MT-unsafe)
-static wxChar s_szBuf[LOG_BUFFER_SIZE];
+// ----------------------------------------------------------------------------
+// wxLogFormatter class implementation
+// ----------------------------------------------------------------------------

 
 

-// generic log function
-void wxLogGeneric(wxLogLevel level, const wxChar *szFormat, ...)
+wxString
+wxLogFormatter::Format(wxLogLevel level,
+                       const wxString& msg,
+                       const wxLogRecordInfo& info) const

 {
 {

-  if ( wxLog::GetActiveTarget() != NULL ) {
-    va_list argptr;
-    va_start(argptr, szFormat);
-    wxVsprintf(s_szBuf, szFormat, argptr);
-    va_end(argptr);
-
-    wxLog::OnLog(level, s_szBuf, time(NULL));
-  }
+    wxString prefix;
+
+    // don't time stamp debug messages under MSW as debug viewers usually
+    // already have an option to do it
+#ifdef __WINDOWS__
+    if ( level != wxLOG_Debug && level != wxLOG_Trace )
+#endif // __WINDOWS__
+        prefix = FormatTime(info.timestamp);
+
+    switch ( level )
+    {
+    case wxLOG_Error:
+        prefix += _("Error: ");
+        break;
+
+    case wxLOG_Warning:
+        prefix += _("Warning: ");
+        break;
+
+        // don't prepend "debug/trace" prefix under MSW as it goes to the debug
+        // window anyhow and so can't be confused with something else
+#ifndef __WINDOWS__
+    case wxLOG_Debug:
+        // this prefix (as well as the one below) is intentionally not
+        // translated as nobody translates debug messages anyhow
+        prefix += "Debug: ";
+        break;
+
+    case wxLOG_Trace:
+        prefix += "Trace: ";
+        break;
+#endif // !__WINDOWS__
+    }
+
+    return prefix + msg;

 }
 
 }
 

-#define IMPLEMENT_LOG_FUNCTION(level)                             \
-  void wxLog##level(const wxChar *szFormat, ...)                  \
-  {                                                               \
-    if ( wxLog::GetActiveTarget() != NULL ) {                     \
-      va_list argptr;                                             \
-      va_start(argptr, szFormat);                                 \
-      wxVsprintf(s_szBuf, szFormat, argptr);                      \
-      va_end(argptr);                                             \
-                                                                  \
-      wxLog::OnLog(wxLOG_##level, s_szBuf, time(NULL));           \
-    }                                                             \
-  }
-
-IMPLEMENT_LOG_FUNCTION(FatalError)
-IMPLEMENT_LOG_FUNCTION(Error)
-IMPLEMENT_LOG_FUNCTION(Warning)
-IMPLEMENT_LOG_FUNCTION(Message)
-IMPLEMENT_LOG_FUNCTION(Info)
-IMPLEMENT_LOG_FUNCTION(Status)
-
-// accepts an additional argument which tells to which frame the output should
-// be directed
-void wxLogStatus(wxFrame *pFrame, const wxChar *szFormat, ...)
+wxString
+wxLogFormatter::FormatTime(time_t t) const

 {
 {

-  wxLog *pLog = wxLog::GetActiveTarget();
-  if ( pLog != NULL ) {
-    va_list argptr;
-    va_start(argptr, szFormat);
-    wxVsprintf(s_szBuf, szFormat, argptr);
-    va_end(argptr);
-
-    wxASSERT( gs_pFrame == NULL ); // should be reset!
-    gs_pFrame = pFrame;
-    wxLog::OnLog(wxLOG_Status, s_szBuf, time(NULL));
-    gs_pFrame = (wxFrame *) NULL;
-  }
+    wxString str;
+    wxLog::TimeStamp(&str, t);
+
+    return str;

 }
 
 }
 

-// same as info, but only if 'verbose' mode is on
-void wxLogVerbose(const wxChar *szFormat, ...)
+
+// ----------------------------------------------------------------------------
+// wxLog class implementation
+// ----------------------------------------------------------------------------
+
+unsigned wxLog::LogLastRepeatIfNeeded()

 {
 {

-  wxLog *pLog = wxLog::GetActiveTarget();
-  if ( pLog != NULL && pLog->GetVerbose() ) {
-    va_list argptr;
-    va_start(argptr, szFormat);
-    wxVsprintf(s_szBuf, szFormat, argptr);
-    va_end(argptr);
-
-    wxLog::OnLog(wxLOG_Info, s_szBuf, time(NULL));
-  }
+    const unsigned count = gs_prevLog.numRepeated;
+
+    if ( gs_prevLog.numRepeated )
+    {
+        wxString msg;
+#if wxUSE_INTL
+        if ( gs_prevLog.numRepeated == 1 )
+        {
+            // We use a separate message for this case as "repeated 1 time"
+            // looks somewhat strange.
+            msg = _("The previous message repeated once.");
+        }
+        else
+        {
+            // Notice that we still use wxPLURAL() to ensure that multiple
+            // numbers of times are correctly formatted, even though we never
+            // actually use the singular string.
+            msg.Printf(wxPLURAL("The previous message repeated %lu time.",
+                                "The previous message repeated %lu times.",
+                                gs_prevLog.numRepeated),
+                       gs_prevLog.numRepeated);
+        }
+#else
+        msg.Printf(wxS("The previous message was repeated %lu time(s)."),
+                   gs_prevLog.numRepeated);
+#endif
+        gs_prevLog.numRepeated = 0;
+        gs_prevLog.msg.clear();
+        DoLogRecord(gs_prevLog.level, msg, gs_prevLog.info);
+    }
+
+    return count;

 }
 
 }
 

-// debug functions
-#ifdef __WXDEBUG__
-#define IMPLEMENT_LOG_DEBUG_FUNCTION(level)                       \
-  void wxLog##level(const wxChar *szFormat, ...)                  \
-  {                                                               \
-    if ( wxLog::GetActiveTarget() != NULL ) {                     \
-      va_list argptr;                                             \
-      va_start(argptr, szFormat);                                 \
-      wxVsprintf(s_szBuf, szFormat, argptr);                      \
-      va_end(argptr);                                             \
-                                                                  \
-      wxLog::OnLog(wxLOG_##level, s_szBuf, time(NULL));           \
-    }                                                             \
-  }
-
-  void wxLogTrace(const wxChar *mask, const wxChar *szFormat, ...)
-  {
-    wxLog *pLog = wxLog::GetActiveTarget();
-
-    if ( pLog != NULL && wxLog::IsAllowedTraceMask(mask) ) {
-      va_list argptr;
-      va_start(argptr, szFormat);
-      wxVsprintf(s_szBuf, szFormat, argptr);
-      va_end(argptr);
-
-      wxLog::OnLog(wxLOG_Trace, s_szBuf, time(NULL));
+wxLog::~wxLog()
+{
+    // Flush() must be called before destroying the object as otherwise some
+    // messages could be lost
+    if ( gs_prevLog.numRepeated )
+    {
+        wxMessageOutputDebug().Printf
+        (
+#if wxUSE_INTL
+            wxPLURAL
+            (
+                "Last repeated message (\"%s\", %lu time) wasn't output",
+                "Last repeated message (\"%s\", %lu times) wasn't output",
+                gs_prevLog.numRepeated
+            ),
+#else
+            wxS("Last repeated message (\"%s\", %lu time(s)) wasn't output"),
+#endif
+            gs_prevLog.msg,
+            gs_prevLog.numRepeated
+        );

     }
     }

-  }
-
-  void wxLogTrace(wxTraceMask mask, const wxChar *szFormat, ...)
-  {
-    wxLog *pLog = wxLog::GetActiveTarget();
-
-    // we check that all of mask bits are set in the current mask, so
-    // that wxLogTrace(wxTraceRefCount | wxTraceOle) will only do something
-    // if both bits are set.
-    if ( pLog != NULL && ((pLog->GetTraceMask() & mask) == mask) ) {
-      va_list argptr;
-      va_start(argptr, szFormat);
-      wxVsprintf(s_szBuf, szFormat, argptr);
-      va_end(argptr);
-
-      wxLog::OnLog(wxLOG_Trace, s_szBuf, time(NULL));
+
+    delete m_formatter;
+}
+
+// ----------------------------------------------------------------------------
+// wxLog logging functions
+// ----------------------------------------------------------------------------
+
+/* static */
+void
+wxLog::OnLog(wxLogLevel level, const wxString& msg, time_t t)
+{
+    wxLogRecordInfo info;
+    info.timestamp = t;
+#if wxUSE_THREADS
+    info.threadId = wxThread::GetCurrentId();
+#endif // wxUSE_THREADS
+
+    OnLog(level, msg, info);
+}
+
+/* static */
+void
+wxLog::OnLog(wxLogLevel level,
+             const wxString& msg,
+             const wxLogRecordInfo& info)
+{
+    // fatal errors can't be suppressed nor handled by the custom log target
+    // and always terminate the program
+    if ( level == wxLOG_FatalError )
+    {
+        wxSafeShowMessage(wxS("Fatal Error"), msg);
+
+        wxAbort();

     }
     }

-  }

 
 

-#else // release
-  #define IMPLEMENT_LOG_DEBUG_FUNCTION(level)
-#endif
+    wxLog *logger;

 
 

-IMPLEMENT_LOG_DEBUG_FUNCTION(Debug)
-IMPLEMENT_LOG_DEBUG_FUNCTION(Trace)
+#if wxUSE_THREADS
+    if ( !wxThread::IsMain() )
+    {
+        logger = wxThreadInfo.logger;
+        if ( !logger )
+        {
+            if ( ms_pLogger )
+            {
+                // buffer the messages until they can be shown from the main
+                // thread
+                wxCriticalSectionLocker lock(GetBackgroundLogCS());
+
+                gs_bufferedLogRecords.push_back(wxLogRecord(level, msg, info));
+
+                // ensure that our Flush() will be called soon
+                wxWakeUpIdle();
+            }
+            //else: we don't have any logger at all, there is no need to log
+            //      anything
+
+            return;
+        }
+        //else: we have a thread-specific logger, we can send messages to it
+        //      directly
+    }
+    else
+#endif // wxUSE_THREADS
+    {
+        logger = GetMainThreadActiveTarget();
+        if ( !logger )
+            return;
+    }

 
 

-// wxLogSysError: one uses the last error code, for other  you must give it
-// explicitly
+    logger->CallDoLogNow(level, msg, info);
+}

 
 

-// common part of both wxLogSysError
-void wxLogSysErrorHelper(long lErrCode)
+void
+wxLog::CallDoLogNow(wxLogLevel level,
+                    const wxString& msg,
+                    const wxLogRecordInfo& info)

 {
 {

-    wxChar szErrMsg[LOG_BUFFER_SIZE / 2];
-    wxSprintf(szErrMsg, _(" (error %ld: %s)"), lErrCode, wxSysErrorMsg(lErrCode));
-    wxStrncat(s_szBuf, szErrMsg, WXSIZEOF(s_szBuf) - wxStrlen(s_szBuf));
+    if ( GetRepetitionCounting() )
+    {
+        if ( msg == gs_prevLog.msg )
+        {
+            gs_prevLog.numRepeated++;
+
+            // nothing else to do, in particular, don't log the
+            // repeated message
+            return;
+        }
+
+        LogLastRepeatIfNeeded();
+
+        // reset repetition counter for a new message
+        gs_prevLog.msg = msg;
+        gs_prevLog.level = level;
+        gs_prevLog.info = info;
+    }
+
+    // handle extra data which may be passed to us by wxLogXXX()
+    wxString prefix, suffix;
+    wxUIntPtr num = 0;
+    if ( info.GetNumValue(wxLOG_KEY_SYS_ERROR_CODE, &num) )
+    {
+        const long err = static_cast<long>(num);

 
 

-    wxLog::OnLog(wxLOG_Error, s_szBuf, time(NULL));
+        suffix.Printf(_(" (error %ld: %s)"), err, wxSysErrorMsg(err));
+    }
+
+#if wxUSE_LOG_TRACE
+    wxString str;
+    if ( level == wxLOG_Trace && info.GetStrValue(wxLOG_KEY_TRACE_MASK, &str) )
+    {
+        prefix = "(" + str + ") ";
+    }
+#endif // wxUSE_LOG_TRACE
+
+    DoLogRecord(level, prefix + msg + suffix, info);

 }
 
 }
 

-void WXDLLEXPORT wxLogSysError(const wxChar *szFormat, ...)
+void wxLog::DoLogRecord(wxLogLevel level,
+                             const wxString& msg,
+                             const wxLogRecordInfo& info)

 {
 {

-    va_list argptr;
-    va_start(argptr, szFormat);
-    wxVsprintf(s_szBuf, szFormat, argptr);
-    va_end(argptr);
+#if WXWIN_COMPATIBILITY_2_8
+    // call the old DoLog() to ensure that existing custom log classes still
+    // work
+    //
+    // as the user code could have defined it as either taking "const char *"
+    // (in ANSI build) or "const wxChar *" (in ANSI/Unicode), we have no choice
+    // but to call both of them
+    DoLog(level, (const char*)msg.mb_str(), info.timestamp);
+    DoLog(level, (const wchar_t*)msg.wc_str(), info.timestamp);
+#else // !WXWIN_COMPATIBILITY_2_8
+    wxUnusedVar(info);
+#endif // WXWIN_COMPATIBILITY_2_8/!WXWIN_COMPATIBILITY_2_8
+
+    // Use wxLogFormatter to format the message
+    DoLogTextAtLevel(level, m_formatter->Format (level, msg, info));
+}

 
 

-    wxLogSysErrorHelper(wxSysErrorCode());
+void wxLog::DoLogTextAtLevel(wxLogLevel level, const wxString& msg)
+{
+    // we know about debug messages (because using wxMessageOutputDebug is the
+    // right thing to do in 99% of all cases and also for compatibility) but
+    // anything else needs to be handled in the derived class
+    if ( level == wxLOG_Debug || level == wxLOG_Trace )
+    {
+        wxMessageOutputDebug().Output(msg + wxS('\n'));
+    }
+    else
+    {
+        DoLogText(msg);
+    }

 }
 
 }
 

-void WXDLLEXPORT wxLogSysError(long lErrCode, const wxChar *szFormat, ...)
+void wxLog::DoLogText(const wxString& WXUNUSED(msg))

 {
 {

-    va_list argptr;
-    va_start(argptr, szFormat);
-    wxVsprintf(s_szBuf, szFormat, argptr);
-    va_end(argptr);
+    // in 2.8-compatible build the derived class might override DoLog() or
+    // DoLogString() instead so we can't have this assert there
+#if !WXWIN_COMPATIBILITY_2_8
+    wxFAIL_MSG( "must be overridden if it is called" );
+#endif // WXWIN_COMPATIBILITY_2_8
+}
+
+#if WXWIN_COMPATIBILITY_2_8

 
 

-    wxLogSysErrorHelper(lErrCode);
+void wxLog::DoLog(wxLogLevel WXUNUSED(level), const char *szString, time_t t)
+{
+    DoLogString(szString, t);

 }
 
 }
 

+void wxLog::DoLog(wxLogLevel WXUNUSED(level), const wchar_t *wzString, time_t t)
+{
+    DoLogString(wzString, t);
+}
+
+#endif // WXWIN_COMPATIBILITY_2_8
+

 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------

-// wxLog class implementation
+// wxLog active target management

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-wxLog::wxLog()
+wxLog *wxLog::GetActiveTarget()

 {
 {

-    m_bHasMessages = FALSE;
-
-    // enable verbose messages by default in the debug builds
-#ifdef __WXDEBUG__
-    m_bVerbose = TRUE;
-#else // release
-    m_bVerbose = FALSE;
-#endif // debug/release
+#if wxUSE_THREADS
+    if ( !wxThread::IsMain() )
+    {
+        // check if we have a thread-specific log target
+        wxLog * const logger = wxThreadInfo.logger;
+
+        // the code below should be only executed for the main thread as
+        // CreateLogTarget() is not meant for auto-creating log targets for
+        // worker threads so skip it in any case
+        return logger ? logger : ms_pLogger;
+    }
+#endif // wxUSE_THREADS
+
+    return GetMainThreadActiveTarget();

 }
 
 }
 

-wxLog *wxLog::GetActiveTarget()
+/* static */
+wxLog *wxLog::GetMainThreadActiveTarget()

 {
     if ( ms_bAutoCreate && ms_pLogger == NULL ) {
         // prevent infinite recursion if someone calls wxLogXXX() from
         // wxApp::CreateLogTarget()
 {
     if ( ms_bAutoCreate && ms_pLogger == NULL ) {
         // prevent infinite recursion if someone calls wxLogXXX() from
         // wxApp::CreateLogTarget()

-        static bool s_bInGetActiveTarget = FALSE;
+        static bool s_bInGetActiveTarget = false;

         if ( !s_bInGetActiveTarget ) {
         if ( !s_bInGetActiveTarget ) {

-            s_bInGetActiveTarget = TRUE;
+            s_bInGetActiveTarget = true;

 
 

-#ifdef  wxUSE_NOGUI
-            ms_pLogger = new wxLogStderr;
-#else

             // ask the application to create a log target for us
             if ( wxTheApp != NULL )
             // ask the application to create a log target for us
             if ( wxTheApp != NULL )

-                ms_pLogger = wxTheApp->CreateLogTarget();
+                ms_pLogger = wxTheApp->GetTraits()->CreateLogTarget();

             else
             else

-                ms_pLogger = new wxLogStderr;
-#endif
+                ms_pLogger = new wxLogOutputBest;

 
 

-            s_bInGetActiveTarget = FALSE;
+            s_bInGetActiveTarget = false;

 
             // do nothing if it fails - what can we do?
         }
 
             // do nothing if it fails - what can we do?
         }


@@ -304,554 +559,425 @@ wxLog *wxLog::SetActiveTarget(wxLog *pLogger)
     return pOldLogger;
 }
 
     return pOldLogger;
 }
 

-void wxLog::RemoveTraceMask(const wxString& str)
+#if wxUSE_THREADS
+/* static */
+wxLog *wxLog::SetThreadActiveTarget(wxLog *logger)

 {
 {

-    int index = ms_aTraceMasks.Index(str);
-    if ( index != wxNOT_FOUND )
-        ms_aTraceMasks.Remove((size_t)index);
-}
+    wxASSERT_MSG( !wxThread::IsMain(), "use SetActiveTarget() for main thread" );

 
 

-void wxLog::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
-{
-    wxString str;
+    wxLog * const oldLogger = wxThreadInfo.logger;
+    if ( oldLogger )
+        oldLogger->Flush();

 
 

-    switch ( level ) {
-        case wxLOG_FatalError:
-            DoLogString(str << _("Fatal error: ") << szString, t);
-            DoLogString(_("Program aborted."), t);
-            Flush();
-            abort();
-            break;
-
-        case wxLOG_Error:
-            DoLogString(str << _("Error: ") << szString, t);
-            break;
-
-        case wxLOG_Warning:
-            DoLogString(str << _("Warning: ") << szString, t);
-            break;
-
-        case wxLOG_Info:
-        case wxLOG_Message:
-            if ( GetVerbose() )
-                DoLogString(str + szString, t);
-            // fall through
-
-        case wxLOG_Status:
-            // nothing to do
-            break;
-
-        case wxLOG_Trace:
-        case wxLOG_Debug:
-#ifdef __WXDEBUG__
-            DoLogString(szString, t);
-#endif
+    wxThreadInfo.logger = logger;

 
 

-            break;
-
-        default:
-            wxFAIL_MSG(_("unknown log level in wxLog::DoLog"));
-    }
+    return oldLogger;

 }
 }

+#endif // wxUSE_THREADS

 
 

-void wxLog::DoLogString(const wxChar *WXUNUSED(szString), time_t t)
+void wxLog::DontCreateOnDemand()

 {
 {

-    wxFAIL_MSG(_T("DoLogString must be overriden if it's called."));
+    ms_bAutoCreate = false;
+
+    // this is usually called at the end of the program and we assume that it
+    // is *always* called at the end - so we free memory here to avoid false
+    // memory leak reports from wxWin  memory tracking code
+    ClearTraceMasks();

 }
 
 }
 

-void wxLog::Flush()
+void wxLog::DoCreateOnDemand()

 {
 {

-    // do nothing
+    ms_bAutoCreate = true;

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------

-// wxLogStderr class implementation
+// wxLog components levels

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-wxLogStderr::wxLogStderr(FILE *fp)
+/* static */
+void wxLog::SetComponentLevel(const wxString& component, wxLogLevel level)

 {
 {

-    if ( fp == NULL )
-        m_fp = stderr;
+    if ( component.empty() )
+    {
+        SetLogLevel(level);
+    }

     else
     else

-        m_fp = fp;
+    {
+        wxCRIT_SECT_LOCKER(lock, GetLevelsCS());
+
+        GetComponentLevels()[component] = level;
+    }

 }
 
 }
 

-void wxLogStderr::DoLogString(const wxChar *szString, time_t t)
+/* static */
+wxLogLevel wxLog::GetComponentLevel(wxString component)

 {
 {

-    wxString str(szString);
-    str << _T('\n');
+    wxCRIT_SECT_LOCKER(lock, GetLevelsCS());

 
 

-    fputs(str.mb_str(), m_fp);
-    fflush(m_fp);
+    const wxStringToNumHashMap& componentLevels = GetComponentLevels();
+    while ( !component.empty() )
+    {
+        wxStringToNumHashMap::const_iterator
+            it = componentLevels.find(component);
+        if ( it != componentLevels.end() )
+            return static_cast<wxLogLevel>(it->second);
+
+        component = component.BeforeLast('/');
+    }

 
 

-    // under Windows, programs usually don't have stderr at all, so make show the
-    // messages also under debugger
-#ifdef __WXMSW__
-    OutputDebugString(str + _T('\r'));
-#endif // MSW
+    return GetLogLevel();

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------

-// wxLogStream implementation
+// wxLog trace masks

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-#if wxUSE_STD_IOSTREAM
-wxLogStream::wxLogStream(ostream *ostr)
+namespace

 {
 {

-    if ( ostr == NULL )
-        m_ostr = &cerr;
-    else
-        m_ostr = ostr;
-}

 
 

-void wxLogStream::DoLogString(const wxChar *szString, time_t t)
+// because IsAllowedTraceMask() may be called during static initialization
+// (this is not recommended but it may still happen, see #11592) we can't use a
+// simple static variable which might be not initialized itself just yet to
+// store the trace masks, but need this accessor function which will ensure
+// that the variable is always correctly initialized before being accessed
+//
+// notice that this doesn't make accessing it MT-safe, of course, you need to
+// serialize accesses to it using GetTraceMaskCS() for this
+wxArrayString& TraceMasks()

 {
 {

-    (*m_ostr) << szString << endl << flush;
-}
-#endif // wxUSE_STD_IOSTREAM
+    static wxArrayString s_traceMasks;

 
 

-#ifndef wxUSE_NOGUI
+    return s_traceMasks;
+}

 
 

-// ----------------------------------------------------------------------------
-// wxLogTextCtrl implementation
-// ----------------------------------------------------------------------------
+} // anonymous namespace

 
 

-#if wxUSE_STD_IOSTREAM
-wxLogTextCtrl::wxLogTextCtrl(wxTextCtrl *pTextCtrl)
-#if !defined(NO_TEXT_WINDOW_STREAM)
-: wxLogStream(new ostream(pTextCtrl))
-#endif
+/* static */ const wxArrayString& wxLog::GetTraceMasks()

 {
 {

-}
+    // because of this function signature (it returns a reference, not the
+    // object), it is inherently MT-unsafe so there is no need to acquire the
+    // lock here anyhow

 
 

-wxLogTextCtrl::~wxLogTextCtrl()
-{
-    delete m_ostr;
+    return TraceMasks();

 }
 }

-#endif // wxUSE_STD_IOSTREAM
-
-// ----------------------------------------------------------------------------
-// wxLogGui implementation (FIXME MT-unsafe)
-// ----------------------------------------------------------------------------

 
 

-wxLogGui::wxLogGui()
+void wxLog::AddTraceMask(const wxString& str)

 {
 {

-    Clear();
-}
+    wxCRIT_SECT_LOCKER(lock, GetTraceMaskCS());

 
 

-void wxLogGui::Clear()
-{
-    m_bErrors = m_bWarnings = FALSE;
-    m_aMessages.Empty();
-    m_aTimes.Empty();
+    TraceMasks().push_back(str);

 }
 
 }
 

-void wxLogGui::Flush()
+void wxLog::RemoveTraceMask(const wxString& str)

 {
 {

-    if ( !m_bHasMessages )
-        return;
-
-    // do it right now to block any new calls to Flush() while we're here
-    m_bHasMessages = FALSE;
+    wxCRIT_SECT_LOCKER(lock, GetTraceMaskCS());

 
 

-    // concatenate all strings (but not too many to not overfill the msg box)
-    wxString str;
-    size_t nLines = 0,
-    nMsgCount = m_aMessages.Count();
+    int index = TraceMasks().Index(str);
+    if ( index != wxNOT_FOUND )
+        TraceMasks().RemoveAt((size_t)index);
+}

 
 

-    // start from the most recent message
-    for ( size_t n = nMsgCount; n > 0; n-- ) {
-        // for Windows strings longer than this value are wrapped (NT 4.0)
-        const size_t nMsgLineWidth = 156;
+void wxLog::ClearTraceMasks()
+{
+    wxCRIT_SECT_LOCKER(lock, GetTraceMaskCS());

 
 

-        nLines += (m_aMessages[n - 1].Len() + nMsgLineWidth - 1) / nMsgLineWidth;
+    TraceMasks().Clear();
+}

 
 

-        if ( nLines > 25 )  // don't put too many lines in message box
-            break;
+/*static*/ bool wxLog::IsAllowedTraceMask(const wxString& mask)
+{
+    wxCRIT_SECT_LOCKER(lock, GetTraceMaskCS());

 
 

-        str << m_aMessages[n - 1] << _T("\n");
+    const wxArrayString& masks = GetTraceMasks();
+    for ( wxArrayString::const_iterator it = masks.begin(),
+                                        en = masks.end();
+          it != en;
+          ++it )
+    {
+        if ( *it == mask)
+            return true;

     }
 
     }
 

-    const wxChar *title;
-    long style;
+    return false;
+}

 
 

-    if ( m_bErrors ) {
-        title = _("Error");
-        style = wxICON_STOP;
-    }
-    else if ( m_bWarnings ) {
-        title = _("Warning");
-        style = wxICON_EXCLAMATION;
-    }
-    else {
-        title = _("Information");
-        style = wxICON_INFORMATION;
-    }
+// ----------------------------------------------------------------------------
+// wxLog miscellaneous other methods
+// ----------------------------------------------------------------------------

 
 

-    wxMessageBox(str, title, wxOK | style);
+#if wxUSE_DATETIME

 
 

-    // no undisplayed messages whatsoever
-    Clear();
+void wxLog::TimeStamp(wxString *str)
+{
+    if ( !ms_timestamp.empty() )
+    {
+        *str = wxDateTime::UNow().Format(ms_timestamp);
+        *str += wxS(": ");
+    }

 }
 
 }
 

-// the default behaviour is to discard all informational messages if there
-// are any errors/warnings.
-void wxLogGui::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
+void wxLog::TimeStamp(wxString *str, time_t t)

 {
 {

-    switch ( level ) {
-        case wxLOG_Info:
-            if ( GetVerbose() )
-        case wxLOG_Message:
-                if ( !m_bErrors ) {
-                    m_aMessages.Add(szString);
-                    m_aTimes.Add((long)t);
-                    m_bHasMessages = TRUE;
-                }
-                break;
-
-        case wxLOG_Status:
-                {
-                    // find the top window and set it's status text if it has any
-                    wxFrame *pFrame = gs_pFrame;
-                    if ( pFrame == NULL ) {
-                        wxWindow *pWin = wxTheApp->GetTopWindow();
-                        if ( pWin != NULL && pWin->IsKindOf(CLASSINFO(wxFrame)) ) {
-                            pFrame = (wxFrame *)pWin;
-                        }
-                    }
-
-                    if ( pFrame != NULL )
-                        pFrame->SetStatusText(szString);
-                }
-                break;
-
-        case wxLOG_Trace:
-        case wxLOG_Debug:
-                #ifdef __WXDEBUG__
-                {
-                    #ifdef __WXMSW__
-                        // don't prepend debug/trace here: it goes to the
-                        // debug window anyhow, but do put a timestamp
-                        OutputDebugString(wxString(szString) + _T("\n\r"));
-                    #else
-                        // send them to stderr
-                        wxFprintf(stderr, _T("%s: %s\n"),
-                                level == wxLOG_Trace ? _T("Trace") : _T("Debug"),
-                                szString);
-                        fflush(stderr);
-                    #endif
-                }
-                #endif // __WXDEBUG__
-
-                break;
-
-        case wxLOG_FatalError:
-                // show this one immediately
-                wxMessageBox(szString, _("Fatal error"), wxICON_HAND);
-                break;
-
-        case wxLOG_Error:
-                // discard earlier informational messages if this is the 1st
-                // error because they might not make sense any more
-                if ( !m_bErrors ) {
-                    m_aMessages.Empty();
-                    m_aTimes.Empty();
-                    m_bHasMessages = TRUE;
-                    m_bErrors = TRUE;
-                }
-                // fall through
-
-        case wxLOG_Warning:
-                if ( !m_bErrors ) {
-                    // for the warning we don't discard the info messages
-                    m_bWarnings = TRUE;
-                }
-
-                m_aMessages.Add(szString);
-                m_aTimes.Add((long)t);
-                break;
-
-        default:
-                wxFAIL_MSG(_("unknown log level in wxLogGui::DoLog"));
+    if ( !ms_timestamp.empty() )
+    {
+        *str = wxDateTime(t).Format(ms_timestamp);
+        *str += wxS(": ");

     }
 }
 
     }
 }
 

-// ----------------------------------------------------------------------------
-// wxLogWindow and wxLogFrame implementation
-// ----------------------------------------------------------------------------
+#else // !wxUSE_DATETIME

 
 

-// log frame class
-// ---------------
-class wxLogFrame : public wxFrame
+void wxLog::TimeStamp(wxString*)

 {
 {

-public:
-    // ctor & dtor
-    wxLogFrame(wxFrame *pParent, wxLogWindow *log, const wxChar *szTitle);
-    virtual ~wxLogFrame();
-
-    // menu callbacks
-    void OnClose(wxCommandEvent& event);
-    void OnCloseWindow(wxCloseEvent& event);
-    void OnSave (wxCommandEvent& event);
-    void OnClear(wxCommandEvent& event);
+}

 
 

-    void OnIdle(wxIdleEvent&);
+void wxLog::TimeStamp(wxString*, time_t)
+{
+}

 
 

-    // accessors
-    wxTextCtrl *TextCtrl() const { return m_pTextCtrl; }
+#endif // wxUSE_DATETIME/!wxUSE_DATETIME

 
 

-private:
-    enum
-    {
-        Menu_Close = 100,
-        Menu_Save,
-        Menu_Clear
-    };
+#if wxUSE_THREADS

 
 

-    // instead of closing just hide the window to be able to Show() it later
-    void DoClose() { Show(FALSE); }
+void wxLog::FlushThreadMessages()
+{
+    // check if we have queued messages from other threads
+    wxLogRecords bufferedLogRecords;

 
 

-    wxTextCtrl  *m_pTextCtrl;
-    wxLogWindow *m_log;
+    {
+        wxCriticalSectionLocker lock(GetBackgroundLogCS());
+        bufferedLogRecords.swap(gs_bufferedLogRecords);

 
 

-    DECLARE_EVENT_TABLE()
-};
+        // release the lock now to not keep it while we are logging the
+        // messages below, allowing background threads to run
+    }

 
 

-BEGIN_EVENT_TABLE(wxLogFrame, wxFrame)
-    // wxLogWindow menu events
-    EVT_MENU(Menu_Close, wxLogFrame::OnClose)
-    EVT_MENU(Menu_Save,  wxLogFrame::OnSave)
-    EVT_MENU(Menu_Clear, wxLogFrame::OnClear)
+    if ( !bufferedLogRecords.empty() )
+    {
+        for ( wxLogRecords::const_iterator it = bufferedLogRecords.begin();
+              it != bufferedLogRecords.end();
+              ++it )
+        {
+            CallDoLogNow(it->level, it->msg, it->info);
+        }
+    }
+}

 
 

-    EVT_CLOSE(wxLogFrame::OnCloseWindow)
-END_EVENT_TABLE()
+/* static */
+bool wxLog::IsThreadLoggingEnabled()
+{
+    return !wxThreadInfo.loggingDisabled;
+}

 
 

-wxLogFrame::wxLogFrame(wxFrame *pParent, wxLogWindow *log, const wxChar *szTitle)
-          : wxFrame(pParent, -1, szTitle)
+/* static */
+bool wxLog::EnableThreadLogging(bool enable)

 {
 {

-    m_log = log;
-
-    m_pTextCtrl = new wxTextCtrl(this, -1, wxEmptyString, wxDefaultPosition,
-            wxDefaultSize,
-            wxTE_MULTILINE  |
-            wxHSCROLL       |
-            wxTE_READONLY);
-
-    // create menu
-    wxMenuBar *pMenuBar = new wxMenuBar;
-    wxMenu *pMenu = new wxMenu;
-    pMenu->Append(Menu_Save,  _("&Save..."), _("Save log contents to file"));
-    pMenu->Append(Menu_Clear, _("C&lear"), _("Clear the log contents"));
-    pMenu->AppendSeparator();
-    pMenu->Append(Menu_Close, _("&Close"), _("Close this window"));
-    pMenuBar->Append(pMenu, _("&Log"));
-    SetMenuBar(pMenuBar);
-
-    // status bar for menu prompts
-    CreateStatusBar();
-
-    m_log->OnFrameCreate(this);
+    const bool wasEnabled = !wxThreadInfo.loggingDisabled;
+    wxThreadInfo.loggingDisabled = !enable;
+    return wasEnabled;

 }
 
 }
 

-void wxLogFrame::OnClose(wxCommandEvent& WXUNUSED(event))
+#endif // wxUSE_THREADS
+
+wxLogFormatter *wxLog::SetFormatter(wxLogFormatter* formatter)

 {
 {

-    DoClose();
+    wxLogFormatter* formatterOld = m_formatter;
+    m_formatter = formatter ? formatter : new wxLogFormatter;
+
+    return formatterOld;

 }
 
 }
 

-void wxLogFrame::OnCloseWindow(wxCloseEvent& WXUNUSED(event))
+void wxLog::Flush()

 {
 {

-    DoClose();
+    LogLastRepeatIfNeeded();

 }
 
 }
 

-void wxLogFrame::OnSave(wxCommandEvent& WXUNUSED(event))
+/* static */
+void wxLog::FlushActive()

 {
 {

-    // get the file name
-    // -----------------
-    const wxChar *szFileName = wxSaveFileSelector(_T("log"), _T("txt"), _T("log.txt"));
-    if ( szFileName == NULL ) {
-        // cancelled
+    if ( ms_suspendCount )

         return;
         return;

-    }

 
 

-    // open file
-    // ---------
-    wxFile file;
-    bool bOk = FALSE;
-    if ( wxFile::Exists(szFileName) ) {
-        bool bAppend = FALSE;
-        wxString strMsg;
-        strMsg.Printf(_("Append log to file '%s' "
-                    "(choosing [No] will overwrite it)?"), szFileName);
-        switch ( wxMessageBox(strMsg, _("Question"), wxYES_NO | wxCANCEL) ) {
-            case wxYES:
-                bAppend = TRUE;
-                break;
-
-            case wxNO:
-                bAppend = FALSE;
-                break;
-
-            case wxCANCEL:
-                return;
-
-            default:
-                wxFAIL_MSG(_("invalid message box return value"));
-        }
+    wxLog * const log = GetActiveTarget();
+    if ( log )
+    {
+#if wxUSE_THREADS
+        if ( wxThread::IsMain() )
+            log->FlushThreadMessages();
+#endif // wxUSE_THREADS

 
 

-        if ( bAppend ) {
-            bOk = file.Open(szFileName, wxFile::write_append);
-        }
-        else {
-            bOk = file.Create(szFileName, TRUE /* overwrite */);
-        }
-    }
-    else {
-        bOk = file.Create(szFileName);
+        log->Flush();

     }
     }

+}

 
 

-    // retrieve text and save it
-    // -------------------------
-    int nLines = m_pTextCtrl->GetNumberOfLines();
-    for ( int nLine = 0; bOk && nLine < nLines; nLine++ ) {
-        bOk = file.Write(m_pTextCtrl->GetLineText(nLine) +
-                // we're not going to pull in the whole wxTextFile if all we need is this...
-#if wxUSE_TEXTFILE
-                wxTextFile::GetEOL()
-#else // !wxUSE_TEXTFILE
-                '\n'
-#endif // wxUSE_TEXTFILE
-                        );
-    }
+// ----------------------------------------------------------------------------
+// wxLogBuffer implementation
+// ----------------------------------------------------------------------------

 
 

-    if ( bOk )
-        bOk = file.Close();
+void wxLogBuffer::Flush()
+{
+    wxLog::Flush();

 
 

-    if ( !bOk ) {
-        wxLogError(_("Can't save log contents to file."));
-    }
-    else {
-        wxLogStatus(this, _("Log saved to the file '%s'."), szFileName);
+    if ( !m_str.empty() )
+    {
+        wxMessageOutputBest out;
+        out.Printf(wxS("%s"), m_str.c_str());
+        m_str.clear();

     }
 }
 
     }
 }
 

-void wxLogFrame::OnClear(wxCommandEvent& WXUNUSED(event))
+void wxLogBuffer::DoLogTextAtLevel(wxLogLevel level, const wxString& msg)

 {
 {

-    m_pTextCtrl->Clear();
+    // don't put debug messages in the buffer, we don't want to show
+    // them to the user in a msg box, log them immediately
+    switch ( level )
+    {
+        case wxLOG_Debug:
+        case wxLOG_Trace:
+            wxLog::DoLogTextAtLevel(level, msg);
+            break;
+
+        default:
+            m_str << msg << wxS("\n");
+    }

 }
 
 }
 

-wxLogFrame::~wxLogFrame()
+// ----------------------------------------------------------------------------
+// wxLogStderr class implementation
+// ----------------------------------------------------------------------------
+
+wxLogStderr::wxLogStderr(FILE *fp)

 {
 {

-    m_log->OnFrameDelete(this);
+    if ( fp == NULL )
+        m_fp = stderr;
+    else
+        m_fp = fp;

 }
 
 }
 

-// wxLogWindow
-// -----------
-wxLogWindow::wxLogWindow(wxFrame *pParent,
-        const wxChar *szTitle,
-        bool bShow,
-        bool bDoPass)
+void wxLogStderr::DoLogText(const wxString& msg)

 {
 {

-    m_bPassMessages = bDoPass;
-
-    m_pLogFrame = new wxLogFrame(pParent, this, szTitle);
-    m_pOldLog = wxLog::SetActiveTarget(this);
+    wxFputs(msg + '\n', m_fp);
+    fflush(m_fp);

 
 

-    if ( bShow )
-        m_pLogFrame->Show(TRUE);
+    // under GUI systems such as Windows or Mac, programs usually don't have
+    // stderr at all, so show the messages also somewhere else, typically in
+    // the debugger window so that they go at least somewhere instead of being
+    // simply lost
+    if ( m_fp == stderr )
+    {
+        wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
+        if ( traits && !traits->HasStderr() )
+        {
+            wxMessageOutputDebug().Output(msg + wxS('\n'));
+        }
+    }

 }
 
 }
 

-void wxLogWindow::Show(bool bShow)
+// ----------------------------------------------------------------------------
+// wxLogStream implementation
+// ----------------------------------------------------------------------------
+
+#if wxUSE_STD_IOSTREAM
+#include "wx/ioswrap.h"
+wxLogStream::wxLogStream(wxSTD ostream *ostr)

 {
 {

-    m_pLogFrame->Show(bShow);
+    if ( ostr == NULL )
+        m_ostr = &wxSTD cerr;
+    else
+        m_ostr = ostr;

 }
 
 }
 

-void wxLogWindow::Flush()
+void wxLogStream::DoLogText(const wxString& msg)

 {
 {

-    if ( m_pOldLog != NULL )
-        m_pOldLog->Flush();
-
-    m_bHasMessages = FALSE;
+    (*m_ostr) << msg << wxSTD endl;

 }
 }

+#endif // wxUSE_STD_IOSTREAM

 
 

-void wxLogWindow::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
-{
-    // first let the previous logger show it
-    if ( m_pOldLog != NULL && m_bPassMessages ) {
-        // FIXME why can't we access protected wxLog method from here (we derive
-        //       from wxLog)? gcc gives "DoLog is protected in this context", what
-        //       does this mean? Anyhow, the cast is harmless and let's us do what
-        //       we want.
-        ((wxLogWindow *)m_pOldLog)->DoLog(level, szString, t);
-    }
+// ----------------------------------------------------------------------------
+// wxLogChain
+// ----------------------------------------------------------------------------

 
 

-    if ( m_pLogFrame ) {
-        switch ( level ) {
-            case wxLOG_Status:
-                // by default, these messages are ignored by wxLog, so process
-                // them ourselves
-                {
-                    wxString str;
-                    str << _("Status: ") << szString;
-                    DoLogString(str, t);
-                }
-                break;
-
-                // don't put trace messages in the text window for 2 reasons:
-                // 1) there are too many of them
-                // 2) they may provoke other trace messages thus sending a program
-                //    into an infinite loop
-            case wxLOG_Trace:
-                break;
-
-            default:
-                // and this will format it nicely and call our DoLogString()
-                wxLog::DoLog(level, szString, t);
-        }
-    }
+wxLogChain::wxLogChain(wxLog *logger)
+{
+    m_bPassMessages = true;

 
 

-    m_bHasMessages = TRUE;
+    m_logNew = logger;
+    m_logOld = wxLog::SetActiveTarget(this);

 }
 
 }
 

-void wxLogWindow::DoLogString(const wxChar *szString, time_t t)
+wxLogChain::~wxLogChain()

 {
 {

-    // put the text into our window
-    wxTextCtrl *pText = m_pLogFrame->TextCtrl();
+    wxLog::SetActiveTarget(m_logOld);

 
 

-    // remove selection (WriteText is in fact ReplaceSelection)
-#ifdef __WXMSW__
-    long nLen = pText->GetLastPosition();
-    pText->SetSelection(nLen, nLen);
-#endif // Windows
+    if ( m_logNew != this )
+        delete m_logNew;
+}

 
 

-    pText->WriteText(szString);
-    pText->WriteText(_T("\n")); // "\n" ok here (_not_ "\r\n")
+void wxLogChain::SetLog(wxLog *logger)
+{
+    if ( m_logNew != this )
+        delete m_logNew;

 
 

-    // TODO ensure that the line can be seen
+    m_logNew = logger;

 }
 
 }
 

-wxFrame *wxLogWindow::GetFrame() const
+void wxLogChain::Flush()

 {
 {

-    return m_pLogFrame;
+    if ( m_logOld )
+        m_logOld->Flush();
+
+    // be careful to avoid infinite recursion
+    if ( m_logNew && m_logNew != this )
+        m_logNew->Flush();

 }
 
 }
 

-void wxLogWindow::OnFrameCreate(wxFrame * WXUNUSED(frame))
+void wxLogChain::DoLogRecord(wxLogLevel level,
+                             const wxString& msg,
+                             const wxLogRecordInfo& info)

 {
 {

+    // let the previous logger show it
+    if ( m_logOld && IsPassingMessages() )
+        m_logOld->LogRecord(level, msg, info);
+
+    // and also send it to the new one
+    if ( m_logNew )
+    {
+        // don't call m_logNew->LogRecord() to avoid infinite recursion when
+        // m_logNew is this object itself
+        if ( m_logNew != this )
+            m_logNew->LogRecord(level, msg, info);
+        else
+            wxLog::DoLogRecord(level, msg, info);
+    }

 }
 
 }
 

-void wxLogWindow::OnFrameDelete(wxFrame * WXUNUSED(frame))
+#ifdef __VISUALC__
+    // "'this' : used in base member initializer list" - so what?
+    #pragma warning(disable:4355)
+#endif // VC++
+
+// ----------------------------------------------------------------------------
+// wxLogInterposer
+// ----------------------------------------------------------------------------
+
+wxLogInterposer::wxLogInterposer()
+                : wxLogChain(this)

 {
 {

-    m_pLogFrame = (wxLogFrame *)NULL;

 }
 
 }
 

-wxLogWindow::~wxLogWindow()
-{
-    delete m_pOldLog;
+// ----------------------------------------------------------------------------
+// wxLogInterposerTemp
+// ----------------------------------------------------------------------------

 
 

-    // may be NULL if log frame already auto destroyed itself
-    delete m_pLogFrame;
+wxLogInterposerTemp::wxLogInterposerTemp()
+                : wxLogChain(this)
+{
+    DetachOldLog();

 }
 
 }
 

-#endif  //wxUSE_NOGUI
+#ifdef __VISUALC__
+    #pragma warning(default:4355)
+#endif // VC++

 
 // ============================================================================
 // Global functions/variables
 
 // ============================================================================
 // Global functions/variables


@@ -861,11 +987,22 @@ wxLogWindow::~wxLogWindow()
 // static variables
 // ----------------------------------------------------------------------------
 
 // static variables
 // ----------------------------------------------------------------------------
 

-wxLog          *wxLog::ms_pLogger      = (wxLog *)NULL;
-bool            wxLog::ms_doLog        = TRUE;
-bool            wxLog::ms_bAutoCreate  = TRUE;
+bool            wxLog::ms_bRepetCounting = false;
+
+wxLog          *wxLog::ms_pLogger      = NULL;
+bool            wxLog::ms_doLog        = true;
+bool            wxLog::ms_bAutoCreate  = true;
+bool            wxLog::ms_bVerbose     = false;
+
+wxLogLevel      wxLog::ms_logLevel     = wxLOG_Max;  // log everything by default
+
+size_t          wxLog::ms_suspendCount = 0;
+
+wxString        wxLog::ms_timestamp(wxS("%X"));  // time only, no date
+
+#if WXWIN_COMPATIBILITY_2_8

 wxTraceMask     wxLog::ms_ulTraceMask  = (wxTraceMask)0;
 wxTraceMask     wxLog::ms_ulTraceMask  = (wxTraceMask)0;

-wxArrayString   wxLog::ms_aTraceMasks;
+#endif // wxDEBUG_LEVEL

 
 // ----------------------------------------------------------------------------
 // stdout error logging helper
 
 // ----------------------------------------------------------------------------
 // stdout error logging helper


@@ -911,13 +1048,8 @@ static void wxLogWrap(FILE *f, const char *pszPrefix, const char *psz)
 // get error code from syste
 unsigned long wxSysErrorCode()
 {
 // get error code from syste
 unsigned long wxSysErrorCode()
 {

-#ifdef  __WXMSW__
-#ifdef  __WIN32__
+#if defined(__WINDOWS__) && !defined(__WXMICROWIN__)

     return ::GetLastError();
     return ::GetLastError();

-#else   //WIN16
-    // TODO what to do on Windows 3.1?
-    return 0;
-#endif  //WIN16/32

 #else   //Unix
     return errno;
 #endif  //Win/Unix
 #else   //Unix
     return errno;
 #endif  //Win/Unix


@@ -929,143 +1061,64 @@ const wxChar *wxSysErrorMsg(unsigned long nErrCode)
     if ( nErrCode == 0 )
         nErrCode = wxSysErrorCode();
 
     if ( nErrCode == 0 )
         nErrCode = wxSysErrorCode();
 

-#ifdef  __WXMSW__
-#ifdef  __WIN32__
-    static wxChar s_szBuf[LOG_BUFFER_SIZE / 2];
+#if defined(__WINDOWS__) && !defined(__WXMICROWIN__)
+    static wxChar s_szBuf[1024];

 
     // get error message from system
     LPVOID lpMsgBuf;
 
     // get error message from system
     LPVOID lpMsgBuf;

-    FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
-            NULL, nErrCode,
+    if ( ::FormatMessage
+         (
+            FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
+            NULL,
+            nErrCode,

             MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
             (LPTSTR)&lpMsgBuf,
             MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
             (LPTSTR)&lpMsgBuf,

-            0, NULL);
-
-    // copy it to our buffer and free memory
-    wxStrncpy(s_szBuf, (const wxChar *)lpMsgBuf, WXSIZEOF(s_szBuf) - 1);
-    s_szBuf[WXSIZEOF(s_szBuf) - 1] = _T('\0');
-    LocalFree(lpMsgBuf);
-
-    // returned string is capitalized and ended with '\r\n' - bad
-    s_szBuf[0] = (wxChar)wxTolower(s_szBuf[0]);
-    size_t len = wxStrlen(s_szBuf);
-    if ( len > 0 ) {
-        // truncate string
-        if ( s_szBuf[len - 2] == _T('\r') )
-            s_szBuf[len - 2] = _T('\0');
-    }
-
-    return s_szBuf;
-#else   //Win16
-    // TODO
-    return NULL;
-#endif // Win16/32
-#else   // Unix
-#if wxUSE_UNICODE
-    static wxChar s_szBuf[LOG_BUFFER_SIZE / 2];
-    wxConv_libc.MB2WC(s_szBuf, strerror(nErrCode), WXSIZEOF(s_szBuf) -1);
-    return s_szBuf;
-#else
-    return strerror(nErrCode);
-#endif
-#endif  // Win/Unix
-}
-
-// ----------------------------------------------------------------------------
-// debug helper
-// ----------------------------------------------------------------------------
-
-#ifdef  __WXDEBUG__
-
-// break into the debugger
-void Trap()
-{
-#ifdef __WXMSW__
-    DebugBreak();
-#elif defined(__WXMAC__)
-#if __powerc
-    Debugger();
-#else
-    SysBreak();
-#endif
-#elif defined(__UNIX__)
-    raise(SIGTRAP);
-#else
-    // TODO
-#endif // Win/Unix
-}
-
-// this function is called when an assert fails
-void wxOnAssert(const char *szFile, int nLine, const wxChar *szMsg)
-{
-    // this variable can be set to true to suppress "assert failure" messages
-    static bool s_bNoAsserts = FALSE;
-    static bool s_bInAssert = FALSE;        // FIXME MT-unsafe
-
-    if ( s_bInAssert ) {
-        // He-e-e-e-elp!! we're trapped in endless loop
-        Trap();
-
-        s_bInAssert = FALSE;
-
-        return;
+            0,
+            NULL
+         ) == 0 )
+    {
+        // if this happens, something is seriously wrong, so don't use _() here
+        // for safety
+        wxSprintf(s_szBuf, wxS("unknown error %lx"), nErrCode);
+        return s_szBuf;

     }
 
     }
 

-    s_bInAssert = TRUE;
-
-    wxChar szBuf[LOG_BUFFER_SIZE];
-
-    // make life easier for people using VC++ IDE: clicking on the message
-    // will take us immediately to the place of the failed assert
-#ifdef __VISUALC__
-    wxSprintf(szBuf, _T("%s(%d): assert failed"), szFile, nLine);
-#else  // !VC++
-    // make the error message more clear for all the others
-#ifdef wxSprintf
-    wxSprintf(szBuf, _T("Assert failed in file %s at line %d"), szFile, nLine);
-#else
-    wxSprintf(szBuf, _T("Assert failed in file %hs at line %d"), szFile, nLine);
-#endif
-#endif // VC/!VC

 
 

-    if ( szMsg != NULL ) {
-        wxStrcat(szBuf, _T(": "));
-        wxStrcat(szBuf, szMsg);
-    }
-    else {
-        wxStrcat(szBuf, _T("."));
-    }
+    // copy it to our buffer and free memory
+    // Crashes on SmartPhone (FIXME)
+#if !defined(__SMARTPHONE__) /* of WinCE */
+    if( lpMsgBuf != 0 )
+    {
+        wxStrlcpy(s_szBuf, (const wxChar *)lpMsgBuf, WXSIZEOF(s_szBuf));

 
 

-    if ( !s_bNoAsserts ) {
-        // send it to the normal log destination
-        wxLogDebug(szBuf);
+        LocalFree(lpMsgBuf);

 
 

-#if wxUSE_NOGUI
-        Trap();
-#else
-        // this message is intentionally not translated - it is for
-        // developpers only
-        wxStrcat(szBuf, _T("\nDo you want to stop the program?"
-                "\nYou can also choose [Cancel] to suppress "
-                "further warnings."));
-
-        switch ( wxMessageBox(szBuf, _("Debug"),
-                    wxYES_NO | wxCANCEL | wxICON_STOP ) ) {
-            case wxYES:
-                Trap();
-                break;
-
-            case wxCANCEL:
-                s_bNoAsserts = TRUE;
-                break;
-
-                //case wxNO: nothing to do
+        // returned string is capitalized and ended with '\r\n' - bad
+        s_szBuf[0] = (wxChar)wxTolower(s_szBuf[0]);
+        size_t len = wxStrlen(s_szBuf);
+        if ( len > 0 ) {
+            // truncate string
+            if ( s_szBuf[len - 2] == wxS('\r') )
+                s_szBuf[len - 2] = wxS('\0');

         }
         }

-#endif // USE_NOGUI
+    }
+    else
+#endif // !__SMARTPHONE__
+    {
+        s_szBuf[0] = wxS('\0');

     }
 
     }
 

-    s_bInAssert = FALSE;
+    return s_szBuf;
+#else // !__WINDOWS__
+    #if wxUSE_UNICODE
+        static wchar_t s_wzBuf[1024];
+        wxConvCurrent->MB2WC(s_wzBuf, strerror((int)nErrCode),
+                             WXSIZEOF(s_wzBuf) - 1);
+        return s_wzBuf;
+    #else
+        return strerror((int)nErrCode);
+    #endif
+#endif  // __WINDOWS__/!__WINDOWS__

 }
 
 }
 

-#endif  //WXDEBUG
-
+#endif // wxUSE_LOG