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