src/common/log.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        log.cpp
   3 // Purpose:     Assorted wxLogXXX functions, and wxLog (sink for logs)
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     29/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19 #ifdef __GNUG__
  20   #pragma implementation "log.h"
  21 #endif
  22
  23 // For compilers that support precompilation, includes "wx.h".
  24 #include "wx/wxprec.h"
  25
  26 #ifdef __BORLANDC__
  27   #pragma hdrstop
  28 #endif
  29
  30 // wxWindows
  31 #ifndef WX_PRECOMP
  32   #include  <wx/event.h>
  33   #include  <wx/app.h>
  34   #include  <wx/string.h>
  35   #include  <wx/intl.h>
  36   #include  <wx/menu.h>
  37   #include  <wx/frame.h>
  38   #include  <wx/msgdlg.h>
  39   #include  <wx/filedlg.h>
  40   #include  <wx/textctrl.h>
  41 #endif //WX_PRECOMP
  42
  43 #include  <wx/file.h>
  44 #include  <wx/textfile.h>
  45 #include  <wx/utils.h>
  46 #include  <wx/log.h>
  47
  48 // other standard headers
  49 #include  <errno.h>
  50 #include  <stdlib.h>
  51 #include  <time.h>
  52
  53 #ifdef  __WXMSW__
  54   #include  <windows.h>
  55   // Redefines OutputDebugString if necessary
  56   #include  "wx/msw/private.h"
  57 #else   //Unix
  58   #include  <signal.h>
  59 #endif  //Win/Unix
  60
  61 // ----------------------------------------------------------------------------
  62 // non member functions
  63 // ----------------------------------------------------------------------------
  64
  65 // define this to enable wrapping of log messages
  66 //#define LOG_PRETTY_WRAP
  67
  68 #ifdef  LOG_PRETTY_WRAP
  69   static void wxLogWrap(FILE *f, const char *pszPrefix, const char *psz);
  70 #endif
  71
  72 // ----------------------------------------------------------------------------
  73 // global variables
  74 // ----------------------------------------------------------------------------
  75
  76 // we use a global variable to store the frame pointer for wxLogStatus - bad,
  77 // but it's he easiest way
  78 static wxFrame *gs_pFrame; // FIXME MT-unsafe
  79
  80 // ============================================================================
  81 // implementation
  82 // ============================================================================
  83
  84 // ----------------------------------------------------------------------------
  85 // implementation of Log functions
  86 //
  87 // NB: unfortunately we need all these distinct functions, we can't make them
  88 //     macros and not all compilers inline vararg functions.
  89 // ----------------------------------------------------------------------------
  90
  91 // log functions can't allocate memory (LogError("out of memory...") should
  92 // work!), so we use a static buffer for all log messages
  93 #define LOG_BUFFER_SIZE   (4096)
  94
  95 // static buffer for error messages (FIXME MT-unsafe)
  96 static wxChar s_szBuf[LOG_BUFFER_SIZE];
  97
  98 // generic log function
  99 void wxLogGeneric(wxLogLevel level, const wxChar *szFormat, ...)
 100 {
 101   if ( wxLog::GetActiveTarget() != NULL ) {
 102     va_list argptr;
 103     va_start(argptr, szFormat);
 104     wxVsprintf(s_szBuf, szFormat, argptr);
 105     va_end(argptr);
 106
 107     wxLog::OnLog(level, s_szBuf, time(NULL));
 108   }
 109 }
 110
 111 #define IMPLEMENT_LOG_FUNCTION(level)                             \
 112   void wxLog##level(const wxChar *szFormat, ...)                  \
 113   {                                                               \
 114     if ( wxLog::GetActiveTarget() != NULL ) {                     \
 115       va_list argptr;                                             \
 116       va_start(argptr, szFormat);                                 \
 117       wxVsprintf(s_szBuf, szFormat, argptr);                      \
 118       va_end(argptr);                                             \
 119                                                                   \
 120       wxLog::OnLog(wxLOG_##level, s_szBuf, time(NULL));           \
 121     }                                                             \
 122   }
 123
 124 IMPLEMENT_LOG_FUNCTION(FatalError)
 125 IMPLEMENT_LOG_FUNCTION(Error)
 126 IMPLEMENT_LOG_FUNCTION(Warning)
 127 IMPLEMENT_LOG_FUNCTION(Message)
 128 IMPLEMENT_LOG_FUNCTION(Info)
 129 IMPLEMENT_LOG_FUNCTION(Status)
 130
 131 // accepts an additional argument which tells to which frame the output should
 132 // be directed
 133 void wxLogStatus(wxFrame *pFrame, const wxChar *szFormat, ...)
 134 {
 135   wxLog *pLog = wxLog::GetActiveTarget();
 136   if ( pLog != NULL ) {
 137     va_list argptr;
 138     va_start(argptr, szFormat);
 139     wxVsprintf(s_szBuf, szFormat, argptr);
 140     va_end(argptr);
 141
 142     wxASSERT( gs_pFrame == NULL ); // should be reset!
 143     gs_pFrame = pFrame;
 144     wxLog::OnLog(wxLOG_Status, s_szBuf, time(NULL));
 145     gs_pFrame = (wxFrame *) NULL;
 146   }
 147 }
 148
 149 // same as info, but only if 'verbose' mode is on
 150 void wxLogVerbose(const wxChar *szFormat, ...)
 151 {
 152   wxLog *pLog = wxLog::GetActiveTarget();
 153   if ( pLog != NULL && pLog->GetVerbose() ) {
 154     va_list argptr;
 155     va_start(argptr, szFormat);
 156     wxVsprintf(s_szBuf, szFormat, argptr);
 157     va_end(argptr);
 158
 159     wxLog::OnLog(wxLOG_Info, s_szBuf, time(NULL));
 160   }
 161 }
 162
 163 // debug functions
 164 #ifdef __WXDEBUG__
 165 #define IMPLEMENT_LOG_DEBUG_FUNCTION(level)                       \
 166   void wxLog##level(const wxChar *szFormat, ...)                  \
 167   {                                                               \
 168     if ( wxLog::GetActiveTarget() != NULL ) {                     \
 169       va_list argptr;                                             \
 170       va_start(argptr, szFormat);                                 \
 171       wxVsprintf(s_szBuf, szFormat, argptr);                      \
 172       va_end(argptr);                                             \
 173                                                                   \
 174       wxLog::OnLog(wxLOG_##level, s_szBuf, time(NULL));           \
 175     }                                                             \
 176   }
 177
 178   void wxLogTrace(const wxChar *mask, const wxChar *szFormat, ...)
 179   {
 180     wxLog *pLog = wxLog::GetActiveTarget();
 181
 182     if ( pLog != NULL && wxLog::IsAllowedTraceMask(mask) ) {
 183       va_list argptr;
 184       va_start(argptr, szFormat);
 185       wxVsprintf(s_szBuf, szFormat, argptr);
 186       va_end(argptr);
 187
 188       wxLog::OnLog(wxLOG_Trace, s_szBuf, time(NULL));
 189     }
 190   }
 191
 192   void wxLogTrace(wxTraceMask mask, const wxChar *szFormat, ...)
 193   {
 194     wxLog *pLog = wxLog::GetActiveTarget();
 195
 196     // we check that all of mask bits are set in the current mask, so
 197     // that wxLogTrace(wxTraceRefCount | wxTraceOle) will only do something
 198     // if both bits are set.
 199     if ( pLog != NULL && ((pLog->GetTraceMask() & mask) == mask) ) {
 200       va_list argptr;
 201       va_start(argptr, szFormat);
 202       wxVsprintf(s_szBuf, szFormat, argptr);
 203       va_end(argptr);
 204
 205       wxLog::OnLog(wxLOG_Trace, s_szBuf, time(NULL));
 206     }
 207   }
 208
 209 #else // release
 210   #define IMPLEMENT_LOG_DEBUG_FUNCTION(level)
 211 #endif
 212
 213 IMPLEMENT_LOG_DEBUG_FUNCTION(Debug)
 214 IMPLEMENT_LOG_DEBUG_FUNCTION(Trace)
 215
 216 // wxLogSysError: one uses the last error code, for other  you must give it
 217 // explicitly
 218
 219 // common part of both wxLogSysError
 220 void wxLogSysErrorHelper(long lErrCode)
 221 {
 222     wxChar szErrMsg[LOG_BUFFER_SIZE / 2];
 223     wxSprintf(szErrMsg, _(" (error %ld: %s)"), lErrCode, wxSysErrorMsg(lErrCode));
 224     wxStrncat(s_szBuf, szErrMsg, WXSIZEOF(s_szBuf) - wxStrlen(s_szBuf));
 225
 226     wxLog::OnLog(wxLOG_Error, s_szBuf, time(NULL));
 227 }
 228
 229 void WXDLLEXPORT wxLogSysError(const wxChar *szFormat, ...)
 230 {
 231     va_list argptr;
 232     va_start(argptr, szFormat);
 233     wxVsprintf(s_szBuf, szFormat, argptr);
 234     va_end(argptr);
 235
 236     wxLogSysErrorHelper(wxSysErrorCode());
 237 }
 238
 239 void WXDLLEXPORT wxLogSysError(long lErrCode, const wxChar *szFormat, ...)
 240 {
 241     va_list argptr;
 242     va_start(argptr, szFormat);
 243     wxVsprintf(s_szBuf, szFormat, argptr);
 244     va_end(argptr);
 245
 246     wxLogSysErrorHelper(lErrCode);
 247 }
 248
 249 // ----------------------------------------------------------------------------
 250 // wxLog class implementation
 251 // ----------------------------------------------------------------------------
 252
 253 wxLog::wxLog()
 254 {
 255     m_bHasMessages = FALSE;
 256
 257     // enable verbose messages by default in the debug builds
 258 #ifdef __WXDEBUG__
 259     m_bVerbose = TRUE;
 260 #else // release
 261     m_bVerbose = FALSE;
 262 #endif // debug/release
 263 }
 264
 265 wxLog *wxLog::GetActiveTarget()
 266 {
 267     if ( ms_bAutoCreate && ms_pLogger == NULL ) {
 268         // prevent infinite recursion if someone calls wxLogXXX() from
 269         // wxApp::CreateLogTarget()
 270         static bool s_bInGetActiveTarget = FALSE;
 271         if ( !s_bInGetActiveTarget ) {
 272             s_bInGetActiveTarget = TRUE;
 273
 274 #ifdef  wxUSE_NOGUI
 275             ms_pLogger = new wxLogStderr;
 276 #else
 277             // ask the application to create a log target for us
 278             if ( wxTheApp != NULL )
 279                 ms_pLogger = wxTheApp->CreateLogTarget();
 280             else
 281                 ms_pLogger = new wxLogStderr;
 282 #endif
 283
 284             s_bInGetActiveTarget = FALSE;
 285
 286             // do nothing if it fails - what can we do?
 287         }
 288     }
 289
 290     return ms_pLogger;
 291 }
 292
 293 wxLog *wxLog::SetActiveTarget(wxLog *pLogger)
 294 {
 295     if ( ms_pLogger != NULL ) {
 296         // flush the old messages before changing because otherwise they might
 297         // get lost later if this target is not restored
 298         ms_pLogger->Flush();
 299     }
 300
 301     wxLog *pOldLogger = ms_pLogger;
 302     ms_pLogger = pLogger;
 303
 304     return pOldLogger;
 305 }
 306
 307 void wxLog::RemoveTraceMask(const wxString& str)
 308 {
 309     int index = ms_aTraceMasks.Index(str);
 310     if ( index != wxNOT_FOUND )
 311         ms_aTraceMasks.Remove((size_t)index);
 312 }
 313
 314 void wxLog::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
 315 {
 316     switch ( level ) {
 317         case wxLOG_FatalError:
 318             DoLogString(wxString(_("Fatal error: ")) + szString, t);
 319             DoLogString(_("Program aborted."), t);
 320             Flush();
 321             abort();
 322             break;
 323
 324         case wxLOG_Error:
 325             DoLogString(wxString(_("Error: ")) + szString, t);
 326             break;
 327
 328         case wxLOG_Warning:
 329             DoLogString(wxString(_("Warning: ")) + szString, t);
 330             break;
 331
 332         case wxLOG_Info:
 333             if ( GetVerbose() )
 334         case wxLOG_Message:
 335         default:    // log unknown log levels too
 336                 DoLogString(szString, t);
 337             // fall through
 338
 339         case wxLOG_Status:
 340             // nothing to do
 341             break;
 342
 343         case wxLOG_Trace:
 344         case wxLOG_Debug:
 345 #ifdef __WXDEBUG__
 346             DoLogString(szString, t);
 347 #endif
 348             break;
 349     }
 350 }
 351
 352 void wxLog::DoLogString(const wxChar *WXUNUSED(szString), time_t t)
 353 {
 354     wxFAIL_MSG(_T("DoLogString must be overriden if it's called."));
 355 }
 356
 357 void wxLog::Flush()
 358 {
 359     // do nothing
 360 }
 361
 362 // ----------------------------------------------------------------------------
 363 // wxLogStderr class implementation
 364 // ----------------------------------------------------------------------------
 365
 366 wxLogStderr::wxLogStderr(FILE *fp)
 367 {
 368     if ( fp == NULL )
 369         m_fp = stderr;
 370     else
 371         m_fp = fp;
 372 }
 373
 374 void wxLogStderr::DoLogString(const wxChar *szString, time_t t)
 375 {
 376     wxString str(szString);
 377     str << _T('\n');
 378
 379     fputs(str.mb_str(), m_fp);
 380     fflush(m_fp);
 381
 382     // under Windows, programs usually don't have stderr at all, so make show the
 383     // messages also under debugger
 384 #ifdef __WXMSW__
 385     OutputDebugString(str + _T('\r'));
 386 #endif // MSW
 387 }
 388
 389 // ----------------------------------------------------------------------------
 390 // wxLogStream implementation
 391 // ----------------------------------------------------------------------------
 392
 393 #if wxUSE_STD_IOSTREAM
 394 wxLogStream::wxLogStream(ostream *ostr)
 395 {
 396     if ( ostr == NULL )
 397         m_ostr = &cerr;
 398     else
 399         m_ostr = ostr;
 400 }
 401
 402 void wxLogStream::DoLogString(const wxChar *szString, time_t t)
 403 {
 404     (*m_ostr) << wxConv_libc.cWX2MB(szString) << endl << flush;
 405 }
 406 #endif // wxUSE_STD_IOSTREAM
 407
 408 #ifndef wxUSE_NOGUI
 409
 410 // ----------------------------------------------------------------------------
 411 // wxLogTextCtrl implementation
 412 // ----------------------------------------------------------------------------
 413
 414 #if wxUSE_STD_IOSTREAM
 415 wxLogTextCtrl::wxLogTextCtrl(wxTextCtrl *pTextCtrl)
 416 #if !defined(NO_TEXT_WINDOW_STREAM)
 417 : wxLogStream(new ostream(pTextCtrl))
 418 #endif
 419 {
 420 }
 421
 422 wxLogTextCtrl::~wxLogTextCtrl()
 423 {
 424     delete m_ostr;
 425 }
 426 #endif // wxUSE_STD_IOSTREAM
 427
 428 // ----------------------------------------------------------------------------
 429 // wxLogGui implementation (FIXME MT-unsafe)
 430 // ----------------------------------------------------------------------------
 431
 432 wxLogGui::wxLogGui()
 433 {
 434     Clear();
 435 }
 436
 437 void wxLogGui::Clear()
 438 {
 439     m_bErrors = m_bWarnings = FALSE;
 440     m_aMessages.Empty();
 441     m_aTimes.Empty();
 442 }
 443
 444 void wxLogGui::Flush()
 445 {
 446     if ( !m_bHasMessages )
 447         return;
 448
 449     // do it right now to block any new calls to Flush() while we're here
 450     m_bHasMessages = FALSE;
 451
 452     // concatenate all strings (but not too many to not overfill the msg box)
 453     wxString str;
 454     size_t nLines = 0,
 455     nMsgCount = m_aMessages.Count();
 456
 457     // start from the most recent message
 458     for ( size_t n = nMsgCount; n > 0; n-- ) {
 459         // for Windows strings longer than this value are wrapped (NT 4.0)
 460         const size_t nMsgLineWidth = 156;
 461
 462         nLines += (m_aMessages[n - 1].Len() + nMsgLineWidth - 1) / nMsgLineWidth;
 463
 464         if ( nLines > 25 )  // don't put too many lines in message box
 465             break;
 466
 467         str << m_aMessages[n - 1] << _T("\n");
 468     }
 469
 470     const wxChar *title;
 471     long style;
 472
 473     if ( m_bErrors ) {
 474         title = _("Error");
 475         style = wxICON_STOP;
 476     }
 477     else if ( m_bWarnings ) {
 478         title = _("Warning");
 479         style = wxICON_EXCLAMATION;
 480     }
 481     else {
 482         title = _("Information");
 483         style = wxICON_INFORMATION;
 484     }
 485
 486     wxMessageBox(str, title, wxOK | style);
 487
 488     // no undisplayed messages whatsoever
 489     Clear();
 490 }
 491
 492 // the default behaviour is to discard all informational messages if there
 493 // are any errors/warnings.
 494 void wxLogGui::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
 495 {
 496     switch ( level ) {
 497         case wxLOG_Info:
 498             if ( GetVerbose() )
 499         case wxLOG_Message:
 500                 if ( !m_bErrors ) {
 501                     m_aMessages.Add(szString);
 502                     m_aTimes.Add((long)t);
 503                     m_bHasMessages = TRUE;
 504                 }
 505                 break;
 506
 507         case wxLOG_Status:
 508                 {
 509                     // find the top window and set it's status text if it has any
 510                     wxFrame *pFrame = gs_pFrame;
 511                     if ( pFrame == NULL ) {
 512                         wxWindow *pWin = wxTheApp->GetTopWindow();
 513                         if ( pWin != NULL && pWin->IsKindOf(CLASSINFO(wxFrame)) ) {
 514                             pFrame = (wxFrame *)pWin;
 515                         }
 516                     }
 517
 518                     if ( pFrame != NULL )
 519                         pFrame->SetStatusText(szString);
 520                 }
 521                 break;
 522
 523         case wxLOG_Trace:
 524         case wxLOG_Debug:
 525                 #ifdef __WXDEBUG__
 526                 {
 527                     #ifdef __WXMSW__
 528                         // don't prepend debug/trace here: it goes to the
 529                         // debug window anyhow, but do put a timestamp
 530                         OutputDebugString(wxString(szString) + _T("\n\r"));
 531                     #else
 532                         // send them to stderr
 533                         wxFprintf(stderr, _T("%s: %s\n"),
 534                                 level == wxLOG_Trace ? _T("Trace") : _T("Debug"),
 535                                 szString);
 536                         fflush(stderr);
 537                     #endif
 538                 }
 539                 #endif // __WXDEBUG__
 540
 541                 break;
 542
 543         case wxLOG_FatalError:
 544                 // show this one immediately
 545                 wxMessageBox(szString, _("Fatal error"), wxICON_HAND);
 546                 break;
 547
 548         case wxLOG_Error:
 549                 // discard earlier informational messages if this is the 1st
 550                 // error because they might not make sense any more
 551                 if ( !m_bErrors ) {
 552                     m_aMessages.Empty();
 553                     m_aTimes.Empty();
 554                     m_bHasMessages = TRUE;
 555                     m_bErrors = TRUE;
 556                 }
 557                 // fall through
 558
 559         case wxLOG_Warning:
 560                 if ( !m_bErrors ) {
 561                     // for the warning we don't discard the info messages
 562                     m_bWarnings = TRUE;
 563                 }
 564
 565                 m_aMessages.Add(szString);
 566                 m_aTimes.Add((long)t);
 567                 break;
 568     }
 569 }
 570
 571 // ----------------------------------------------------------------------------
 572 // wxLogWindow and wxLogFrame implementation
 573 // ----------------------------------------------------------------------------
 574
 575 // log frame class
 576 // ---------------
 577 class wxLogFrame : public wxFrame
 578 {
 579 public:
 580     // ctor & dtor
 581     wxLogFrame(wxFrame *pParent, wxLogWindow *log, const wxChar *szTitle);
 582     virtual ~wxLogFrame();
 583
 584     // menu callbacks
 585     void OnClose(wxCommandEvent& event);
 586     void OnCloseWindow(wxCloseEvent& event);
 587     void OnSave (wxCommandEvent& event);
 588     void OnClear(wxCommandEvent& event);
 589
 590     void OnIdle(wxIdleEvent&);
 591
 592     // accessors
 593     wxTextCtrl *TextCtrl() const { return m_pTextCtrl; }
 594
 595 private:
 596     enum
 597     {
 598         Menu_Close = 100,
 599         Menu_Save,
 600         Menu_Clear
 601     };
 602
 603     // instead of closing just hide the window to be able to Show() it later
 604     void DoClose() { Show(FALSE); }
 605
 606     wxTextCtrl  *m_pTextCtrl;
 607     wxLogWindow *m_log;
 608
 609     DECLARE_EVENT_TABLE()
 610 };
 611
 612 BEGIN_EVENT_TABLE(wxLogFrame, wxFrame)
 613     // wxLogWindow menu events
 614     EVT_MENU(Menu_Close, wxLogFrame::OnClose)
 615     EVT_MENU(Menu_Save,  wxLogFrame::OnSave)
 616     EVT_MENU(Menu_Clear, wxLogFrame::OnClear)
 617
 618     EVT_CLOSE(wxLogFrame::OnCloseWindow)
 619 END_EVENT_TABLE()
 620
 621 wxLogFrame::wxLogFrame(wxFrame *pParent, wxLogWindow *log, const wxChar *szTitle)
 622           : wxFrame(pParent, -1, szTitle)
 623 {
 624     m_log = log;
 625
 626     m_pTextCtrl = new wxTextCtrl(this, -1, wxEmptyString, wxDefaultPosition,
 627             wxDefaultSize,
 628             wxTE_MULTILINE  |
 629             wxHSCROLL       |
 630             wxTE_READONLY);
 631
 632     // create menu
 633     wxMenuBar *pMenuBar = new wxMenuBar;
 634     wxMenu *pMenu = new wxMenu;
 635     pMenu->Append(Menu_Save,  _("&Save..."), _("Save log contents to file"));
 636     pMenu->Append(Menu_Clear, _("C&lear"), _("Clear the log contents"));
 637     pMenu->AppendSeparator();
 638     pMenu->Append(Menu_Close, _("&Close"), _("Close this window"));
 639     pMenuBar->Append(pMenu, _("&Log"));
 640     SetMenuBar(pMenuBar);
 641
 642     // status bar for menu prompts
 643     CreateStatusBar();
 644
 645     m_log->OnFrameCreate(this);
 646 }
 647
 648 void wxLogFrame::OnClose(wxCommandEvent& WXUNUSED(event))
 649 {
 650     DoClose();
 651 }
 652
 653 void wxLogFrame::OnCloseWindow(wxCloseEvent& WXUNUSED(event))
 654 {
 655     DoClose();
 656 }
 657
 658 void wxLogFrame::OnSave(wxCommandEvent& WXUNUSED(event))
 659 {
 660     // get the file name
 661     // -----------------
 662     const wxChar *szFileName = wxSaveFileSelector(_T("log"), _T("txt"), _T("log.txt"));
 663     if ( szFileName == NULL ) {
 664         // cancelled
 665         return;
 666     }
 667
 668     // open file
 669     // ---------
 670     wxFile file;
 671     bool bOk = FALSE;
 672     if ( wxFile::Exists(szFileName) ) {
 673         bool bAppend = FALSE;
 674         wxString strMsg;
 675         strMsg.Printf(_("Append log to file '%s' "
 676                     "(choosing [No] will overwrite it)?"), szFileName);
 677         switch ( wxMessageBox(strMsg, _("Question"), wxYES_NO | wxCANCEL) ) {
 678             case wxYES:
 679                 bAppend = TRUE;
 680                 break;
 681
 682             case wxNO:
 683                 bAppend = FALSE;
 684                 break;
 685
 686             case wxCANCEL:
 687                 return;
 688
 689             default:
 690                 wxFAIL_MSG(_("invalid message box return value"));
 691         }
 692
 693         if ( bAppend ) {
 694             bOk = file.Open(szFileName, wxFile::write_append);
 695         }
 696         else {
 697             bOk = file.Create(szFileName, TRUE /* overwrite */);
 698         }
 699     }
 700     else {
 701         bOk = file.Create(szFileName);
 702     }
 703
 704     // retrieve text and save it
 705     // -------------------------
 706     int nLines = m_pTextCtrl->GetNumberOfLines();
 707     for ( int nLine = 0; bOk && nLine < nLines; nLine++ ) {
 708         bOk = file.Write(m_pTextCtrl->GetLineText(nLine) +
 709                 // we're not going to pull in the whole wxTextFile if all we need is this...
 710 #if wxUSE_TEXTFILE
 711                 wxTextFile::GetEOL()
 712 #else // !wxUSE_TEXTFILE
 713                 '\n'
 714 #endif // wxUSE_TEXTFILE
 715                         );
 716     }
 717
 718     if ( bOk )
 719         bOk = file.Close();
 720
 721     if ( !bOk ) {
 722         wxLogError(_("Can't save log contents to file."));
 723     }
 724     else {
 725         wxLogStatus(this, _("Log saved to the file '%s'."), szFileName);
 726     }
 727 }
 728
 729 void wxLogFrame::OnClear(wxCommandEvent& WXUNUSED(event))
 730 {
 731     m_pTextCtrl->Clear();
 732 }
 733
 734 wxLogFrame::~wxLogFrame()
 735 {
 736     m_log->OnFrameDelete(this);
 737 }
 738
 739 // wxLogWindow
 740 // -----------
 741 wxLogWindow::wxLogWindow(wxFrame *pParent,
 742         const wxChar *szTitle,
 743         bool bShow,
 744         bool bDoPass)
 745 {
 746     m_bPassMessages = bDoPass;
 747
 748     m_pLogFrame = new wxLogFrame(pParent, this, szTitle);
 749     m_pOldLog = wxLog::SetActiveTarget(this);
 750
 751     if ( bShow )
 752         m_pLogFrame->Show(TRUE);
 753 }
 754
 755 void wxLogWindow::Show(bool bShow)
 756 {
 757     m_pLogFrame->Show(bShow);
 758 }
 759
 760 void wxLogWindow::Flush()
 761 {
 762     if ( m_pOldLog != NULL )
 763         m_pOldLog->Flush();
 764
 765     m_bHasMessages = FALSE;
 766 }
 767
 768 void wxLogWindow::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
 769 {
 770     // first let the previous logger show it
 771     if ( m_pOldLog != NULL && m_bPassMessages ) {
 772         // FIXME why can't we access protected wxLog method from here (we derive
 773         //       from wxLog)? gcc gives "DoLog is protected in this context", what
 774         //       does this mean? Anyhow, the cast is harmless and let's us do what
 775         //       we want.
 776         ((wxLogWindow *)m_pOldLog)->DoLog(level, szString, t);
 777     }
 778
 779     if ( m_pLogFrame ) {
 780         switch ( level ) {
 781             case wxLOG_Status:
 782                 // by default, these messages are ignored by wxLog, so process
 783                 // them ourselves
 784                 if ( !wxIsEmpty(szString) )
 785                 {
 786                     wxString str;
 787                     str << _("Status: ") << szString;
 788                     DoLogString(str, t);
 789                 }
 790                 break;
 791
 792                 // don't put trace messages in the text window for 2 reasons:
 793                 // 1) there are too many of them
 794                 // 2) they may provoke other trace messages thus sending a program
 795                 //    into an infinite loop
 796             case wxLOG_Trace:
 797                 break;
 798
 799             default:
 800                 // and this will format it nicely and call our DoLogString()
 801                 wxLog::DoLog(level, szString, t);
 802         }
 803     }
 804
 805     m_bHasMessages = TRUE;
 806 }
 807
 808 void wxLogWindow::DoLogString(const wxChar *szString, time_t t)
 809 {
 810     // put the text into our window
 811     wxTextCtrl *pText = m_pLogFrame->TextCtrl();
 812
 813     // remove selection (WriteText is in fact ReplaceSelection)
 814 #ifdef __WXMSW__
 815     long nLen = pText->GetLastPosition();
 816     pText->SetSelection(nLen, nLen);
 817 #endif // Windows
 818
 819     pText->WriteText(szString);
 820     pText->WriteText(_T("\n")); // "\n" ok here (_not_ "\r\n")
 821
 822     // TODO ensure that the line can be seen
 823 }
 824
 825 wxFrame *wxLogWindow::GetFrame() const
 826 {
 827     return m_pLogFrame;
 828 }
 829
 830 void wxLogWindow::OnFrameCreate(wxFrame * WXUNUSED(frame))
 831 {
 832 }
 833
 834 void wxLogWindow::OnFrameDelete(wxFrame * WXUNUSED(frame))
 835 {
 836     m_pLogFrame = (wxLogFrame *)NULL;
 837 }
 838
 839 wxLogWindow::~wxLogWindow()
 840 {
 841     delete m_pOldLog;
 842
 843     // may be NULL if log frame already auto destroyed itself
 844     delete m_pLogFrame;
 845 }
 846
 847 #endif  //wxUSE_NOGUI
 848
 849 // ============================================================================
 850 // Global functions/variables
 851 // ============================================================================
 852
 853 // ----------------------------------------------------------------------------
 854 // static variables
 855 // ----------------------------------------------------------------------------
 856
 857 wxLog          *wxLog::ms_pLogger      = (wxLog *)NULL;
 858 bool            wxLog::ms_doLog        = TRUE;
 859 bool            wxLog::ms_bAutoCreate  = TRUE;
 860 wxTraceMask     wxLog::ms_ulTraceMask  = (wxTraceMask)0;
 861 wxArrayString   wxLog::ms_aTraceMasks;
 862
 863 // ----------------------------------------------------------------------------
 864 // stdout error logging helper
 865 // ----------------------------------------------------------------------------
 866
 867 // helper function: wraps the message and justifies it under given position
 868 // (looks more pretty on the terminal). Also adds newline at the end.
 869 //
 870 // TODO this is now disabled until I find a portable way of determining the
 871 //      terminal window size (ok, I found it but does anybody really cares?)
 872 #ifdef LOG_PRETTY_WRAP
 873 static void wxLogWrap(FILE *f, const char *pszPrefix, const char *psz)
 874 {
 875     size_t nMax = 80; // FIXME
 876     size_t nStart = strlen(pszPrefix);
 877     fputs(pszPrefix, f);
 878
 879     size_t n;
 880     while ( *psz != '\0' ) {
 881         for ( n = nStart; (n < nMax) && (*psz != '\0'); n++ )
 882             putc(*psz++, f);
 883
 884         // wrapped?
 885         if ( *psz != '\0' ) {
 886             /*putc('\n', f);*/
 887             for ( n = 0; n < nStart; n++ )
 888                 putc(' ', f);
 889
 890             // as we wrapped, squeeze all white space
 891             while ( isspace(*psz) )
 892                 psz++;
 893         }
 894     }
 895
 896     putc('\n', f);
 897 }
 898 #endif  //LOG_PRETTY_WRAP
 899
 900 // ----------------------------------------------------------------------------
 901 // error code/error message retrieval functions
 902 // ----------------------------------------------------------------------------
 903
 904 // get error code from syste
 905 unsigned long wxSysErrorCode()
 906 {
 907 #ifdef  __WXMSW__
 908 #ifdef  __WIN32__
 909     return ::GetLastError();
 910 #else   //WIN16
 911     // TODO what to do on Windows 3.1?
 912     return 0;
 913 #endif  //WIN16/32
 914 #else   //Unix
 915     return errno;
 916 #endif  //Win/Unix
 917 }
 918
 919 // get error message from system
 920 const wxChar *wxSysErrorMsg(unsigned long nErrCode)
 921 {
 922     if ( nErrCode == 0 )
 923         nErrCode = wxSysErrorCode();
 924
 925 #ifdef  __WXMSW__
 926 #ifdef  __WIN32__
 927     static wxChar s_szBuf[LOG_BUFFER_SIZE / 2];
 928
 929     // get error message from system
 930     LPVOID lpMsgBuf;
 931     FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
 932             NULL, nErrCode,
 933             MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
 934             (LPTSTR)&lpMsgBuf,
 935             0, NULL);
 936
 937     // copy it to our buffer and free memory
 938     wxStrncpy(s_szBuf, (const wxChar *)lpMsgBuf, WXSIZEOF(s_szBuf) - 1);
 939     s_szBuf[WXSIZEOF(s_szBuf) - 1] = _T('\0');
 940     LocalFree(lpMsgBuf);
 941
 942     // returned string is capitalized and ended with '\r\n' - bad
 943     s_szBuf[0] = (wxChar)wxTolower(s_szBuf[0]);
 944     size_t len = wxStrlen(s_szBuf);
 945     if ( len > 0 ) {
 946         // truncate string
 947         if ( s_szBuf[len - 2] == _T('\r') )
 948             s_szBuf[len - 2] = _T('\0');
 949     }
 950
 951     return s_szBuf;
 952 #else   //Win16
 953     // TODO
 954     return NULL;
 955 #endif // Win16/32
 956 #else   // Unix
 957 #if wxUSE_UNICODE
 958     static wxChar s_szBuf[LOG_BUFFER_SIZE / 2];
 959     wxConv_libc.MB2WC(s_szBuf, strerror(nErrCode), WXSIZEOF(s_szBuf) -1);
 960     return s_szBuf;
 961 #else
 962     return strerror(nErrCode);
 963 #endif
 964 #endif  // Win/Unix
 965 }
 966
 967 // ----------------------------------------------------------------------------
 968 // debug helper
 969 // ----------------------------------------------------------------------------
 970
 971 #ifdef  __WXDEBUG__
 972
 973 // break into the debugger
 974 void Trap()
 975 {
 976 #ifdef __WXMSW__
 977     DebugBreak();
 978 #elif defined(__WXMAC__)
 979 #if __powerc
 980     Debugger();
 981 #else
 982     SysBreak();
 983 #endif
 984 #elif defined(__UNIX__)
 985     raise(SIGTRAP);
 986 #else
 987     // TODO
 988 #endif // Win/Unix
 989 }
 990
 991 // this function is called when an assert fails
 992 void wxOnAssert(const wxChar *szFile, int nLine, const wxChar *szMsg)
 993 {
 994     // this variable can be set to true to suppress "assert failure" messages
 995     static bool s_bNoAsserts = FALSE;
 996     static bool s_bInAssert = FALSE;        // FIXME MT-unsafe
 997
 998     if ( s_bInAssert ) {
 999         // He-e-e-e-elp!! we're trapped in endless loop
1000         Trap();
1001
1002         s_bInAssert = FALSE;
1003
1004         return;
1005     }
1006
1007     s_bInAssert = TRUE;
1008
1009     wxChar szBuf[LOG_BUFFER_SIZE];
1010
1011     // make life easier for people using VC++ IDE: clicking on the message
1012     // will take us immediately to the place of the failed assert
1013 #ifdef __VISUALC__
1014     wxSprintf(szBuf, _T("%s(%d): assert failed"), szFile, nLine);
1015 #else  // !VC++
1016     // make the error message more clear for all the others
1017     wxSprintf(szBuf, _T("Assert failed in file %s at line %d"), szFile, nLine);
1018 #endif // VC/!VC
1019
1020     if ( szMsg != NULL ) {
1021         wxStrcat(szBuf, _T(": "));
1022         wxStrcat(szBuf, szMsg);
1023     }
1024     else {
1025         wxStrcat(szBuf, _T("."));
1026     }
1027
1028     if ( !s_bNoAsserts ) {
1029         // send it to the normal log destination
1030         wxLogDebug(szBuf);
1031
1032 #if wxUSE_NOGUI
1033         Trap();
1034 #else
1035         // this message is intentionally not translated - it is for
1036         // developpers only
1037         wxStrcat(szBuf, _T("\nDo you want to stop the program?"
1038                 "\nYou can also choose [Cancel] to suppress "
1039                 "further warnings."));
1040
1041         switch ( wxMessageBox(szBuf, _("Debug"),
1042                     wxYES_NO | wxCANCEL | wxICON_STOP ) ) {
1043             case wxYES:
1044                 Trap();
1045                 break;
1046
1047             case wxCANCEL:
1048                 s_bNoAsserts = TRUE;
1049                 break;
1050
1051                 //case wxNO: nothing to do
1052         }
1053 #endif // USE_NOGUI
1054     }
1055
1056     s_bInAssert = FALSE;
1057 }
1058
1059 #endif  //WXDEBUG
1060