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/app.h>
  33   #include  <wx/string.h>
  34   #include  <wx/intl.h>
  35   #include  <wx/menu.h>
  36
  37   #include  <wx/generic/msgdlgg.h>
  38   #include  <wx/filedlg.h>
  39   #include  <wx/textctrl.h>
  40 #endif //WX_PRECOMP
  41
  42 #include  <wx/file.h>
  43 #include  <wx/textfile.h>
  44 #include  <wx/utils.h>
  45 #include  <wx/log.h>
  46
  47 // other standard headers
  48 #include  <errno.h>
  49 #include  <stdlib.h>
  50 #include  <time.h>
  51
  52 #ifdef  __WXMSW__
  53   #include  <windows.h>
  54 #else   //Unix
  55   #include  <signal.h>
  56 #endif  //Win/Unix
  57
  58 // ----------------------------------------------------------------------------
  59 // non member functions
  60 // ----------------------------------------------------------------------------
  61
  62 // define this to enable wrapping of log messages
  63 //#define LOG_PRETTY_WRAP
  64
  65 #ifdef  LOG_PRETTY_WRAP
  66   static void wxLogWrap(FILE *f, const char *pszPrefix, const char *psz);
  67 #endif
  68
  69 // ============================================================================
  70 // implementation
  71 // ============================================================================
  72
  73 // ----------------------------------------------------------------------------
  74 // implementation of Log functions
  75 //
  76 // NB: unfortunately we need all these distinct functions, we can't make them
  77 //     macros and not all compilers inline vararg functions.
  78 // ----------------------------------------------------------------------------
  79
  80 // log functions can't allocate memory (LogError("out of memory...") should
  81 // work!), so we use a static buffer for all log messages
  82 #define LOG_BUFFER_SIZE   (4096)
  83
  84 // static buffer for error messages (@@@ MT-unsafe)
  85 static char s_szBuf[LOG_BUFFER_SIZE];
  86
  87 // generic log function
  88 void wxLogGeneric(wxLogLevel level, const char *szFormat, ...)
  89 {
  90   if ( wxLog::GetActiveTarget() != NULL ) {
  91     va_list argptr;
  92     va_start(argptr, szFormat);
  93     vsprintf(s_szBuf, szFormat, argptr);
  94     va_end(argptr);
  95
  96     wxLog::OnLog(level, s_szBuf);
  97   }
  98 }
  99
 100 #define IMPLEMENT_LOG_FUNCTION(level)                             \
 101   void wxLog##level(const char *szFormat, ...)                    \
 102   {                                                               \
 103     if ( wxLog::GetActiveTarget() != NULL ) {                     \
 104       va_list argptr;                                             \
 105       va_start(argptr, szFormat);                                 \
 106       vsprintf(s_szBuf, szFormat, argptr);                        \
 107       va_end(argptr);                                             \
 108                                                                   \
 109       wxLog::OnLog(wxLOG_##level, s_szBuf);                       \
 110     }                                                             \
 111   }
 112
 113 IMPLEMENT_LOG_FUNCTION(FatalError)
 114 IMPLEMENT_LOG_FUNCTION(Error)
 115 IMPLEMENT_LOG_FUNCTION(Warning)
 116 IMPLEMENT_LOG_FUNCTION(Message)
 117 IMPLEMENT_LOG_FUNCTION(Info)
 118 IMPLEMENT_LOG_FUNCTION(Status)
 119
 120 // same as info, but only if 'verbose' mode is on
 121 void wxLogVerbose(const char *szFormat, ...)
 122 {
 123   wxLog *pLog = wxLog::GetActiveTarget();
 124   if ( pLog != NULL && pLog->GetVerbose() ) {
 125     va_list argptr;
 126     va_start(argptr, szFormat);
 127     vsprintf(s_szBuf, szFormat, argptr);
 128     va_end(argptr);
 129
 130     wxLog::OnLog(wxLOG_Info, s_szBuf);
 131   }
 132 }
 133
 134 // debug functions
 135 #ifdef __WXDEBUG__
 136 #define IMPLEMENT_LOG_DEBUG_FUNCTION(level)                       \
 137   void wxLog##level(const char *szFormat, ...)                    \
 138   {                                                               \
 139     if ( wxLog::GetActiveTarget() != NULL ) {                     \
 140       va_list argptr;                                             \
 141       va_start(argptr, szFormat);                                 \
 142       vsprintf(s_szBuf, szFormat, argptr);                        \
 143       va_end(argptr);                                             \
 144                                                                   \
 145       wxLog::OnLog(wxLOG_##level, s_szBuf);                       \
 146     }                                                             \
 147   }
 148
 149   void wxLogTrace(wxTraceMask mask, const char *szFormat, ...)
 150   {
 151     wxLog *pLog = wxLog::GetActiveTarget();
 152
 153     // we check that all of mask bits are set in the current mask, so
 154     // that wxLogTrace(wxTraceRefCount | wxTraceOle) will only do something
 155     // if both bits are set.
 156     if ( pLog != NULL && (pLog->GetTraceMask() & mask == mask) ) {
 157       va_list argptr;
 158       va_start(argptr, szFormat);
 159       vsprintf(s_szBuf, szFormat, argptr);
 160       va_end(argptr);
 161
 162       wxLog::OnLog(wxLOG_Trace, s_szBuf);
 163     }
 164   }
 165
 166 #else // release
 167   #define IMPLEMENT_LOG_DEBUG_FUNCTION(level)
 168 #endif
 169
 170 IMPLEMENT_LOG_DEBUG_FUNCTION(Debug)
 171 IMPLEMENT_LOG_DEBUG_FUNCTION(Trace)
 172
 173 // wxLogSysError: one uses the last error code, for other  you must give it
 174 // explicitly
 175
 176 // common part of both wxLogSysError
 177 void wxLogSysErrorHelper(long lErrCode)
 178 {
 179   char szErrMsg[LOG_BUFFER_SIZE / 2];
 180   sprintf(szErrMsg, _(" (error %ld: %s)"), lErrCode, wxSysErrorMsg(lErrCode));
 181   strncat(s_szBuf, szErrMsg, WXSIZEOF(s_szBuf) - strlen(s_szBuf));
 182
 183   wxLog::OnLog(wxLOG_Error, s_szBuf);
 184 }
 185
 186 void WXDLLEXPORT wxLogSysError(const char *szFormat, ...)
 187 {
 188   va_list argptr;
 189   va_start(argptr, szFormat);
 190   vsprintf(s_szBuf, szFormat, argptr);
 191   va_end(argptr);
 192
 193   wxLogSysErrorHelper(wxSysErrorCode());
 194 }
 195
 196 void WXDLLEXPORT wxLogSysError(long lErrCode, const char *szFormat, ...)
 197 {
 198   va_list argptr;
 199   va_start(argptr, szFormat);
 200   vsprintf(s_szBuf, szFormat, argptr);
 201   va_end(argptr);
 202
 203   wxLogSysErrorHelper(lErrCode);
 204 }
 205
 206 // ----------------------------------------------------------------------------
 207 // wxLog class implementation
 208 // ----------------------------------------------------------------------------
 209
 210 wxLog::wxLog()
 211 {
 212   m_bHasMessages = FALSE;
 213   m_bVerbose     = FALSE;
 214   m_szTimeFormat = "[%d/%b/%y %H:%M:%S] ";
 215 }
 216
 217 wxLog *wxLog::GetActiveTarget()
 218 {
 219   if ( ms_bAutoCreate && ms_pLogger == NULL ) {
 220     // prevent infinite recursion if someone calls wxLogXXX() from
 221     // wxApp::CreateLogTarget()
 222     static bool s_bInGetActiveTarget = FALSE;
 223     if ( !s_bInGetActiveTarget ) {
 224       s_bInGetActiveTarget = TRUE;
 225
 226       #ifdef  WX_TEST_MINIMAL
 227         ms_pLogger = new wxLogStderr;
 228       #else
 229         // ask the application to create a log target for us
 230         if ( wxTheApp != NULL )
 231           ms_pLogger = wxTheApp->CreateLogTarget();
 232       #endif
 233
 234       // do nothing if it fails - what can we do?
 235     }
 236   }
 237
 238   return ms_pLogger;
 239 }
 240
 241 wxLog *wxLog::SetActiveTarget(wxLog *pLogger)
 242 {
 243   // flush the old messages before changing
 244   if ( ms_pLogger != NULL )
 245     ms_pLogger->Flush();
 246
 247   wxLog *pOldLogger = ms_pLogger;
 248   ms_pLogger = pLogger;
 249   return pOldLogger;
 250 }
 251
 252 void wxLog::DoLog(wxLogLevel level, const char *szString)
 253 {
 254   wxString str;
 255
 256   // prepend a timestamp if not disabled
 257   if ( !IsEmpty(m_szTimeFormat) ) {
 258     char szBuf[128];
 259     time_t timeNow;
 260     struct tm *ptmNow;
 261
 262     time(&timeNow);
 263     ptmNow = localtime(&timeNow);
 264
 265     strftime(szBuf, WXSIZEOF(szBuf), m_szTimeFormat, ptmNow);
 266     str = szBuf;
 267   }
 268
 269   switch ( level ) {
 270     case wxLOG_FatalError:
 271       DoLogString(str << _("Fatal error: ") << szString);
 272       DoLogString(_("Program aborted."));
 273       Flush();
 274       abort();
 275       break;
 276
 277     case wxLOG_Error:
 278       DoLogString(str << _("Error: ") << szString);
 279       break;
 280
 281     case wxLOG_Warning:
 282       DoLogString(str << _("Warning: ") << szString);
 283       break;
 284
 285     case wxLOG_Info:
 286       if ( GetVerbose() )
 287     case wxLOG_Message:
 288         DoLogString(str + szString);
 289       // fall through
 290
 291     case wxLOG_Status:
 292       // nothing to do
 293       break;
 294
 295     case wxLOG_Trace:
 296     case wxLOG_Debug:
 297       #ifdef __WXDEBUG__
 298         #ifdef  __WIN32__
 299           // in addition to normal logging, also send the string to debugger
 300           // (don't prepend "Debug" here: it will go to debug window anyhow)
 301           ::OutputDebugString(str + szString + "\n\r");
 302         #endif  //Win32
 303         DoLogString(str << (level == wxLOG_Trace ? _("Trace") : _("Debug"))
 304                         << ": " << szString);
 305       #endif
 306
 307       break;
 308
 309     default:
 310       wxFAIL_MSG("unknown log level in wxLog::DoLog");
 311   }
 312 }
 313
 314 void wxLog::DoLogString(const char *WXUNUSED(szString))
 315 {
 316   wxFAIL_MSG("DoLogString must be overrided if it's called.");
 317 }
 318
 319 void wxLog::Flush()
 320 {
 321   // do nothing
 322 }
 323
 324 // ----------------------------------------------------------------------------
 325 // wxLogStderr class implementation
 326 // ----------------------------------------------------------------------------
 327
 328 wxLogStderr::wxLogStderr(FILE *fp)
 329 {
 330   if ( fp == NULL )
 331     m_fp = stderr;
 332   else
 333     m_fp = fp;
 334 }
 335
 336 void wxLogStderr::DoLogString(const char *szString)
 337 {
 338   fputs(szString, m_fp);
 339   fputc('\n', m_fp);
 340   fflush(m_fp);
 341 }
 342
 343 // ----------------------------------------------------------------------------
 344 // wxLogStream implementation
 345 // ----------------------------------------------------------------------------
 346
 347 wxLogStream::wxLogStream(ostream *ostr)
 348 {
 349   if ( ostr == NULL )
 350     m_ostr = &cerr;
 351   else
 352     m_ostr = ostr;
 353 }
 354
 355 void wxLogStream::DoLogString(const char *szString)
 356 {
 357   (*m_ostr) << szString << endl << flush;
 358 }
 359
 360 // ----------------------------------------------------------------------------
 361 // wxLogTextCtrl implementation
 362 // ----------------------------------------------------------------------------
 363 wxLogTextCtrl::wxLogTextCtrl(wxTextCtrl *pTextCtrl)
 364 // @@@ TODO: in wxGTK wxTextCtrl doesn't derive from streambuf
 365              : wxLogStream(new ostream(pTextCtrl))
 366 {
 367 }
 368
 369 wxLogTextCtrl::~wxLogTextCtrl()
 370 {
 371   delete m_ostr;
 372 }
 373
 374 // ----------------------------------------------------------------------------
 375 // wxLogGui implementation
 376 // ----------------------------------------------------------------------------
 377
 378 #ifndef   WX_TEST_MINIMAL
 379
 380 wxLogGui::wxLogGui()
 381 {
 382   m_bErrors = FALSE;
 383 }
 384
 385 void wxLogGui::Flush()
 386 {
 387   if ( !m_bHasMessages )
 388     return;
 389
 390   // @@@ ugly...
 391
 392   // concatenate all strings (but not too many to not overfill the msg box)
 393   wxString str;
 394   uint nLines    = 0,
 395        nMsgCount = m_aMessages.Count();
 396
 397   // start from the most recent message
 398   for ( uint n = nMsgCount; n > 0; n-- ) {
 399     // for Windows strings longer than this value are wrapped (NT 4.0)
 400     const uint nMsgLineWidth = 156;
 401
 402     nLines += (m_aMessages[n - 1].Len() + nMsgLineWidth - 1) / nMsgLineWidth;
 403
 404     if ( nLines > 25 )  // don't put too many lines in message box
 405       break;
 406
 407     str << m_aMessages[n - 1] << "\n";
 408   }
 409
 410   if ( m_bErrors ) {
 411     wxMessageBox(str, _("Error"), wxOK | wxICON_EXCLAMATION);
 412   }
 413   else {
 414     wxMessageBox(str, _("Information"), wxOK | wxICON_INFORMATION);
 415   }
 416
 417   // no undisplayed messages whatsoever
 418   m_bHasMessages =
 419   m_bErrors      = FALSE;
 420   m_aMessages.Empty();
 421 }
 422
 423 // the default behaviour is to discard all informational messages if there
 424 // are any errors/warnings.
 425 void wxLogGui::DoLog(wxLogLevel level, const char *szString)
 426 {
 427   switch ( level ) {
 428     case wxLOG_Info:
 429       if ( GetVerbose() )
 430     case wxLOG_Message:
 431         if ( !m_bErrors ) {
 432           m_aMessages.Add(szString);
 433           m_bHasMessages = TRUE;
 434         }
 435       break;
 436
 437     case wxLOG_Status:
 438       {
 439         // find the top window and set it's status text if it has any
 440         wxWindow *pWin = wxTheApp->GetTopWindow();
 441         if ( pWin != NULL && pWin->IsKindOf(CLASSINFO(wxFrame)) ) {
 442           wxFrame *pFrame = (wxFrame *)pWin;
 443           pFrame->SetStatusText(szString);
 444         }
 445       }
 446       break;
 447
 448     case wxLOG_Trace:
 449     case wxLOG_Debug:
 450       #ifdef __WXDEBUG__
 451         #ifdef  __WIN32__
 452           OutputDebugString(szString);
 453           OutputDebugString("\n\r");
 454         #else   //!WIN32
 455           // send them to stderr
 456           fprintf(stderr, "%s: %s\n",
 457                   level == wxLOG_Trace ? _("Trace") : _("Debug"), szString);
 458           fflush(stderr);
 459         #endif  // WIN32
 460       #endif
 461       break;
 462
 463     case wxLOG_FatalError:
 464       // show this one immediately
 465       wxMessageBox(szString, _("Fatal error"), wxICON_HAND);
 466       break;
 467
 468     case wxLOG_Error:
 469     case wxLOG_Warning:
 470       // discard earlier informational messages if this is the 1st error
 471       if ( !m_bErrors ) {
 472         m_aMessages.Empty();
 473         m_bHasMessages = TRUE;
 474         m_bErrors = TRUE;
 475       }
 476
 477       m_aMessages.Add(szString);
 478       break;
 479
 480     default:
 481       wxFAIL_MSG("unknown log level in wxLogGui::DoLog");
 482   }
 483 }
 484
 485 // ----------------------------------------------------------------------------
 486 // wxLogWindow implementation
 487 // ----------------------------------------------------------------------------
 488
 489 // log frame class
 490 class wxLogFrame : public wxFrame
 491 {
 492 public:
 493   // ctor
 494   wxLogFrame(const char *szTitle);
 495
 496   // menu callbacks
 497   void OnClose(wxCommandEvent& event);
 498   void OnCloseWindow(wxCloseEvent& event);
 499   void OnSave (wxCommandEvent& event);
 500   void OnClear(wxCommandEvent& event);
 501
 502   // accessors
 503   wxTextCtrl *TextCtrl() const { return m_pTextCtrl; }
 504
 505 private:
 506   enum
 507   {
 508     Menu_Close = 100,
 509     Menu_Save,
 510     Menu_Clear
 511   };
 512
 513   wxTextCtrl *m_pTextCtrl;
 514
 515   DECLARE_EVENT_TABLE()
 516 };
 517
 518 BEGIN_EVENT_TABLE(wxLogFrame, wxFrame)
 519   // wxLogWindow menu events
 520   EVT_MENU(Menu_Close, wxLogFrame::OnClose)
 521   EVT_MENU(Menu_Save,  wxLogFrame::OnSave)
 522   EVT_MENU(Menu_Clear, wxLogFrame::OnClear)
 523
 524   EVT_CLOSE(wxLogFrame::OnCloseWindow)
 525 END_EVENT_TABLE()
 526
 527 wxLogFrame::wxLogFrame(const char *szTitle)
 528           : wxFrame(NULL, -1, szTitle)
 529 {
 530   // we don't want to be a top-level frame because it would prevent the
 531   // application termination when all other frames are closed
 532   wxTopLevelWindows.DeleteObject(this);
 533
 534   // @@ kludge: wxSIMPLE_BORDER is simply to prevent wxWindows from creating
 535   //    a rich edit control instead of a normal one we want
 536   m_pTextCtrl = new wxTextCtrl(this, -1, wxEmptyString, wxDefaultPosition,
 537                                wxDefaultSize,
 538                                wxSIMPLE_BORDER |
 539                                wxTE_MULTILINE  |
 540                                wxHSCROLL       |
 541                                wxTE_READONLY);
 542   /*
 543   m_pTextCtrl->SetEditable(FALSE);
 544   m_pTextCtrl->SetRichEdit(FALSE);
 545   */
 546
 547   // create menu
 548   wxMenuBar *pMenuBar = new wxMenuBar;
 549   wxMenu *pMenu = new wxMenu;
 550   pMenu->Append(Menu_Save,  "&Save...");
 551   pMenu->Append(Menu_Clear, "C&lear");
 552   pMenu->AppendSeparator();
 553   pMenu->Append(Menu_Close, "&Close");
 554   pMenuBar->Append(pMenu, "&Log");
 555   SetMenuBar(pMenuBar);
 556
 557   // @@ what about status bar? needed (for menu prompts)?
 558 }
 559
 560 void wxLogFrame::OnClose(wxCommandEvent& WXUNUSED(event))
 561 {
 562   // just hide the window
 563   Show(FALSE);
 564 }
 565
 566 void wxLogFrame::OnCloseWindow(wxCloseEvent& WXUNUSED(event))
 567 {
 568   // just hide the window
 569   Show(FALSE);
 570 }
 571
 572 void wxLogFrame::OnSave(wxCommandEvent& WXUNUSED(event))
 573 {
 574   // get the file name
 575   // -----------------
 576   const char *szFileName = wxSaveFileSelector("log", "txt", "log.txt");
 577   if ( szFileName == NULL ) {
 578     // cancelled
 579     return;
 580   }
 581
 582   // open file
 583   // ---------
 584   wxFile file;
 585   bool bOk = FALSE;
 586   if ( wxFile::Exists(szFileName) ) {
 587     bool bAppend = FALSE;
 588     wxString strMsg;
 589     strMsg.Printf(_("Append log to file '%s' "
 590                     "(choosing [No] will overwrite it)?"), szFileName);
 591     switch ( wxMessageBox(strMsg, "Question", wxYES_NO | wxCANCEL) ) {
 592       case wxYES:
 593         bAppend = TRUE;
 594         break;
 595
 596       case wxNO:
 597         bAppend = FALSE;
 598         break;
 599
 600       case wxCANCEL:
 601         return;
 602
 603       default:
 604         wxFAIL_MSG("invalid message box return value");
 605     }
 606
 607     if ( bAppend ) {
 608       bOk = file.Open(szFileName, wxFile::write_append);
 609     }
 610     else {
 611       bOk = file.Create(szFileName, TRUE /* overwrite */);
 612     }
 613   }
 614   else {
 615     bOk = file.Create(szFileName);
 616   }
 617
 618   // retrieve text and save it
 619   // -------------------------
 620 #ifdef __WXGTK__
 621   // @@@@ TODO: no GetNumberOfLines and GetLineText in wxGTK yet
 622   wxLogError("Sorry, this function is not implemented under GTK");
 623 #else
 624   int nLines = m_pTextCtrl->GetNumberOfLines();
 625   for ( int nLine = 0; bOk && nLine < nLines; nLine++ ) {
 626     bOk = file.Write(m_pTextCtrl->GetLineText(nLine) + wxTextFile::GetEOL());
 627   }
 628 #endif //GTK
 629
 630   if ( bOk )
 631     bOk = file.Close();
 632
 633   if ( !bOk ) {
 634     wxLogError(_("Can't save log contents to file."));
 635     return;
 636   }
 637 }
 638
 639 void wxLogFrame::OnClear(wxCommandEvent& WXUNUSED(event))
 640 {
 641   m_pTextCtrl->Clear();
 642 }
 643
 644 wxLogWindow::wxLogWindow(const char *szTitle, bool bShow)
 645 {
 646   m_pOldLog = wxLog::GetActiveTarget();
 647   m_pLogFrame = new wxLogFrame(szTitle);
 648
 649   if ( bShow )
 650     m_pLogFrame->Show(TRUE);
 651 }
 652
 653 void wxLogWindow::Show(bool bShow)
 654 {
 655   m_pLogFrame->Show(bShow);
 656 }
 657
 658 void wxLogWindow::DoLog(wxLogLevel level, const char *szString)
 659 {
 660   // first let the previous logger show it
 661   if ( m_pOldLog != NULL ) {
 662     // @@@ why can't we access protected wxLog method from here (we derive
 663     // from wxLog)? gcc gives "DoLog is protected in this context", what
 664     // does this mean? Anyhow, the cast is harmless and let's us do what
 665     // we want.
 666     ((wxLogWindow *)m_pOldLog)->DoLog(level, szString);
 667   }
 668
 669   // and this will format it nicely and call our DoLogString()
 670   wxLog::DoLog(level, szString);
 671 }
 672
 673 void wxLogWindow::DoLogString(const char *szString)
 674 {
 675   // put the text into our window
 676   wxTextCtrl *pText = m_pLogFrame->TextCtrl();
 677
 678   // remove selection (WriteText is in fact ReplaceSelection)
 679   #ifdef __WXMSW__
 680     long nLen = pText->GetLastPosition();
 681     pText->SetSelection(nLen, nLen);
 682   #endif // Windows
 683
 684   pText->WriteText(szString);
 685   pText->WriteText("\n"); // "\n" ok here (_not_ "\r\n")
 686
 687   // ensure that the line can be seen
 688   // @@@ TODO
 689 }
 690
 691 wxLogWindow::~wxLogWindow()
 692 {
 693   m_pLogFrame->Close(TRUE);
 694 }
 695
 696 #endif  //WX_TEST_MINIMAL
 697
 698 // ============================================================================
 699 // Global functions/variables
 700 // ============================================================================
 701
 702 // ----------------------------------------------------------------------------
 703 // static variables
 704 // ----------------------------------------------------------------------------
 705 wxLog      *wxLog::ms_pLogger      = NULL;
 706 bool        wxLog::ms_bAutoCreate  = TRUE;
 707 wxTraceMask wxLog::ms_ulTraceMask  = (wxTraceMask)0;
 708
 709 // ----------------------------------------------------------------------------
 710 // stdout error logging helper
 711 // ----------------------------------------------------------------------------
 712
 713 // helper function: wraps the message and justifies it under given position
 714 // (looks more pretty on the terminal). Also adds newline at the end.
 715 //
 716 // @@ this is now disabled until I find a portable way of determining the
 717 //    terminal window size (ok, I found it but does anybody really cares?)
 718 #ifdef    LOG_PRETTY_WRAP
 719 static void wxLogWrap(FILE *f, const char *pszPrefix, const char *psz)
 720 {
 721   size_t nMax = 80; // @@@@
 722   size_t nStart = strlen(pszPrefix);
 723   fputs(pszPrefix, f);
 724
 725   size_t n;
 726   while ( *psz != '\0' ) {
 727     for ( n = nStart; (n < nMax) && (*psz != '\0'); n++ )
 728       putc(*psz++, f);
 729
 730     // wrapped?
 731     if ( *psz != '\0' ) {
 732       /*putc('\n', f);*/
 733       for ( n = 0; n < nStart; n++ )
 734         putc(' ', f);
 735
 736       // as we wrapped, squeeze all white space
 737       while ( isspace(*psz) )
 738         psz++;
 739     }
 740   }
 741
 742   putc('\n', f);
 743 }
 744 #endif  //LOG_PRETTY_WRAP
 745
 746 // ----------------------------------------------------------------------------
 747 // error code/error message retrieval functions
 748 // ----------------------------------------------------------------------------
 749
 750 // get error code from syste
 751 unsigned long wxSysErrorCode()
 752 {
 753   #ifdef  __WXMSW__
 754     #ifdef  __WIN32__
 755       return ::GetLastError();
 756     #else   //WIN16
 757       // @@@@ what to do on Windows 3.1?
 758       return 0;
 759     #endif  //WIN16/32
 760   #else   //Unix
 761     return errno;
 762   #endif  //Win/Unix
 763 }
 764
 765 // get error message from system
 766 const char *wxSysErrorMsg(unsigned long nErrCode)
 767 {
 768   if ( nErrCode == 0 )
 769     nErrCode = wxSysErrorCode();
 770
 771   #ifdef  __WXMSW__
 772     #ifdef  __WIN32__
 773       static char s_szBuf[LOG_BUFFER_SIZE / 2];
 774
 775       // get error message from system
 776       LPVOID lpMsgBuf;
 777       FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
 778                     NULL, nErrCode,
 779                     MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
 780                     (LPTSTR)&lpMsgBuf,
 781                     0, NULL);
 782
 783       // copy it to our buffer and free memory
 784       strncpy(s_szBuf, (const char *)lpMsgBuf, WXSIZEOF(s_szBuf) - 1);
 785       s_szBuf[WXSIZEOF(s_szBuf) - 1] = '\0';
 786       LocalFree(lpMsgBuf);
 787
 788       // returned string is capitalized and ended with '\r\n' - bad
 789       s_szBuf[0] = (char)wxToLower(s_szBuf[0]);
 790       size_t len = strlen(s_szBuf);
 791       if ( len > 0 ) {
 792         // truncate string
 793         if ( s_szBuf[len - 2] == '\r' )
 794           s_szBuf[len - 2] = '\0';
 795       }
 796
 797       return s_szBuf;
 798     #else   //Win16
 799       // TODO @@@@
 800       return NULL;
 801     #endif // Win16/32
 802   #else   // Unix
 803     return strerror(nErrCode);
 804   #endif  // Win/Unix
 805 }
 806
 807 // ----------------------------------------------------------------------------
 808 // debug helper
 809 // ----------------------------------------------------------------------------
 810
 811 #ifdef  __WXDEBUG__
 812
 813 void Trap()
 814 {
 815   #ifdef __WXMSW__
 816     DebugBreak();
 817   #else // Unix
 818     raise(SIGTRAP);
 819   #endif // Win/Unix
 820 }
 821
 822 // this function is called when an assert fails
 823 void wxOnAssert(const char *szFile, int nLine, const char *szMsg)
 824 {
 825   // this variable can be set to true to suppress "assert failure" messages
 826   static bool s_bNoAsserts = FALSE;
 827   static bool s_bInAssert = FALSE;
 828
 829   if ( s_bInAssert ) {
 830     // He-e-e-e-elp!! we're trapped in endless loop
 831     Trap();
 832   }
 833
 834   s_bInAssert = TRUE;
 835
 836   char szBuf[LOG_BUFFER_SIZE];
 837   sprintf(szBuf, _("Assert failed in file %s at line %d"), szFile, nLine);
 838   if ( szMsg != NULL ) {
 839     strcat(szBuf, ": ");
 840     strcat(szBuf, szMsg);
 841   }
 842   else {
 843     strcat(szBuf, ".");
 844   }
 845
 846   if ( !s_bNoAsserts ) {
 847     // send it to the normal log destination
 848     wxLogDebug(szBuf);
 849
 850     strcat(szBuf, _("\nDo you want to stop the program?"
 851                     "\nYou can also choose [Cancel] to suppress "
 852                     "further warnings."));
 853
 854     switch ( wxMessageBox(szBuf, _("Debug"),
 855                           wxYES_NO | wxCANCEL | wxICON_STOP ) ) {
 856       case wxYES:
 857         Trap();
 858         break;
 859
 860       case wxCANCEL:
 861         s_bNoAsserts = TRUE;
 862         break;
 863
 864       //case wxNO: nothing to do
 865     }
 866   }
 867
 868   s_bInAssert = FALSE;
 869 }
 870
 871 #endif  //WXDEBUG
 872