src/common/log.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/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 licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_LOG
  28
  29 // wxWidgets
  30 #ifndef WX_PRECOMP
  31     #include "wx/log.h"
  32     #include "wx/app.h"
  33     #include "wx/arrstr.h"
  34     #include "wx/intl.h"
  35     #include "wx/string.h"
  36     #include "wx/utils.h"
  37 #endif //WX_PRECOMP
  38
  39 #include "wx/apptrait.h"
  40 #include "wx/file.h"
  41 #include "wx/msgout.h"
  42 #include "wx/textfile.h"
  43 #include "wx/thread.h"
  44 #include "wx/wxchar.h"
  45
  46 // other standard headers
  47 #ifndef __WXWINCE__
  48 #include <errno.h>
  49 #endif
  50
  51 #include <stdlib.h>
  52
  53 #ifndef __WXWINCE__
  54 #include <time.h>
  55 #else
  56 #include "wx/msw/wince/time.h"
  57 #endif
  58
  59 #if defined(__WINDOWS__)
  60     #include "wx/msw/private.h" // includes windows.h
  61 #endif
  62
  63 // ----------------------------------------------------------------------------
  64 // non member functions
  65 // ----------------------------------------------------------------------------
  66
  67 // define this to enable wrapping of log messages
  68 //#define LOG_PRETTY_WRAP
  69
  70 #ifdef  LOG_PRETTY_WRAP
  71   static void wxLogWrap(FILE *f, const char *pszPrefix, const char *psz);
  72 #endif
  73
  74 // ============================================================================
  75 // implementation
  76 // ============================================================================
  77
  78 // ----------------------------------------------------------------------------
  79 // implementation of Log functions
  80 //
  81 // NB: unfortunately we need all these distinct functions, we can't make them
  82 //     macros and not all compilers inline vararg functions.
  83 // ----------------------------------------------------------------------------
  84
  85 // generic log function
  86 void wxVLogGeneric(wxLogLevel level, const wxChar *szFormat, va_list argptr)
  87 {
  88     if ( wxLog::IsEnabled() ) {
  89         wxLog::OnLog(level, wxString::FormatV(szFormat, argptr), time(NULL));
  90     }
  91 }
  92
  93 void wxLogGeneric(wxLogLevel level, const wxChar *szFormat, ...)
  94 {
  95     va_list argptr;
  96     va_start(argptr, szFormat);
  97     wxVLogGeneric(level, szFormat, argptr);
  98     va_end(argptr);
  99 }
 100
 101 #define IMPLEMENT_LOG_FUNCTION(level)                               \
 102   void wxVLog##level(const wxChar *szFormat, va_list argptr)        \
 103   {                                                                 \
 104     if ( wxLog::IsEnabled() ) {                                     \
 105       wxLog::OnLog(wxLOG_##level,                                   \
 106                    wxString::FormatV(szFormat, argptr), time(NULL));\
 107     }                                                               \
 108   }                                                                 \
 109                                                                     \
 110   void wxLog##level(const wxChar *szFormat, ...)                    \
 111   {                                                                 \
 112     va_list argptr;                                                 \
 113     va_start(argptr, szFormat);                                     \
 114     wxVLog##level(szFormat, argptr);                                \
 115     va_end(argptr);                                                 \
 116   }
 117
 118 IMPLEMENT_LOG_FUNCTION(Error)
 119 IMPLEMENT_LOG_FUNCTION(Warning)
 120 IMPLEMENT_LOG_FUNCTION(Message)
 121 IMPLEMENT_LOG_FUNCTION(Info)
 122 IMPLEMENT_LOG_FUNCTION(Status)
 123
 124 void wxSafeShowMessage(const wxString& title, const wxString& text)
 125 {
 126 #ifdef __WINDOWS__
 127     ::MessageBox(NULL, text, title, MB_OK | MB_ICONSTOP);
 128 #else
 129     wxFprintf(stderr, _T("%s: %s\n"), title.c_str(), text.c_str());
 130     fflush(stderr);
 131 #endif
 132 }
 133
 134 // fatal errors can't be suppressed nor handled by the custom log target and
 135 // always terminate the program
 136 void wxVLogFatalError(const wxChar *szFormat, va_list argptr)
 137 {
 138     wxSafeShowMessage(_T("Fatal Error"), wxString::FormatV(szFormat, argptr));
 139
 140 #ifdef __WXWINCE__
 141     ExitThread(3);
 142 #else
 143     abort();
 144 #endif
 145 }
 146
 147 void wxLogFatalError(const wxChar *szFormat, ...)
 148 {
 149     va_list argptr;
 150     va_start(argptr, szFormat);
 151     wxVLogFatalError(szFormat, argptr);
 152
 153     // some compilers warn about unreachable code and it shouldn't matter
 154     // for the others anyhow...
 155     //va_end(argptr);
 156 }
 157
 158 // same as info, but only if 'verbose' mode is on
 159 void wxVLogVerbose(const wxChar *szFormat, va_list argptr)
 160 {
 161     if ( wxLog::IsEnabled() ) {
 162         if ( wxLog::GetActiveTarget() != NULL && wxLog::GetVerbose() ) {
 163             wxLog::OnLog(wxLOG_Info,
 164                          wxString::FormatV(szFormat, argptr), time(NULL));
 165         }
 166     }
 167 }
 168
 169 void wxLogVerbose(const wxChar *szFormat, ...)
 170 {
 171     va_list argptr;
 172     va_start(argptr, szFormat);
 173     wxVLogVerbose(szFormat, argptr);
 174     va_end(argptr);
 175 }
 176
 177 // debug functions
 178 #ifdef __WXDEBUG__
 179 #define IMPLEMENT_LOG_DEBUG_FUNCTION(level)                         \
 180   void wxVLog##level(const wxChar *szFormat, va_list argptr)        \
 181   {                                                                 \
 182     if ( wxLog::IsEnabled() ) {                                     \
 183       wxLog::OnLog(wxLOG_##level,                                   \
 184                    wxString::FormatV(szFormat, argptr), time(NULL));\
 185     }                                                               \
 186   }                                                                 \
 187                                                                     \
 188   void wxLog##level(const wxChar *szFormat, ...)                    \
 189   {                                                                 \
 190     va_list argptr;                                                 \
 191     va_start(argptr, szFormat);                                     \
 192     wxVLog##level(szFormat, argptr);                                \
 193     va_end(argptr);                                                 \
 194   }
 195
 196   void wxVLogTrace(const wxChar *mask, const wxChar *szFormat, va_list argptr)
 197   {
 198     if ( wxLog::IsEnabled() && wxLog::IsAllowedTraceMask(mask) ) {
 199       wxString msg;
 200       msg << _T("(") << mask << _T(") ") << wxString::FormatV(szFormat, argptr);
 201
 202       wxLog::OnLog(wxLOG_Trace, msg, time(NULL));
 203     }
 204   }
 205
 206   void wxLogTrace(const wxChar *mask, const wxChar *szFormat, ...)
 207   {
 208     va_list argptr;
 209     va_start(argptr, szFormat);
 210     wxVLogTrace(mask, szFormat, argptr);
 211     va_end(argptr);
 212   }
 213
 214   void wxVLogTrace(wxTraceMask mask, const wxChar *szFormat, va_list argptr)
 215   {
 216     // we check that all of mask bits are set in the current mask, so
 217     // that wxLogTrace(wxTraceRefCount | wxTraceOle) will only do something
 218     // if both bits are set.
 219     if ( wxLog::IsEnabled() && ((wxLog::GetTraceMask() & mask) == mask) ) {
 220       wxLog::OnLog(wxLOG_Trace, wxString::FormatV(szFormat, argptr), time(NULL));
 221     }
 222   }
 223
 224   void wxLogTrace(wxTraceMask mask, const wxChar *szFormat, ...)
 225   {
 226     va_list argptr;
 227     va_start(argptr, szFormat);
 228     wxVLogTrace(mask, szFormat, argptr);
 229     va_end(argptr);
 230   }
 231
 232 #else // release
 233   #define IMPLEMENT_LOG_DEBUG_FUNCTION(level)
 234 #endif
 235
 236 IMPLEMENT_LOG_DEBUG_FUNCTION(Debug)
 237 IMPLEMENT_LOG_DEBUG_FUNCTION(Trace)
 238
 239 // wxLogSysError: one uses the last error code, for other  you must give it
 240 // explicitly
 241
 242 // return the system error message description
 243 static inline wxString wxLogSysErrorHelper(long err)
 244 {
 245     return wxString::Format(_(" (error %ld: %s)"), err, wxSysErrorMsg(err));
 246 }
 247
 248 void WXDLLEXPORT wxVLogSysError(const wxChar *szFormat, va_list argptr)
 249 {
 250     wxVLogSysError(wxSysErrorCode(), szFormat, argptr);
 251 }
 252
 253 void WXDLLEXPORT wxLogSysError(const wxChar *szFormat, ...)
 254 {
 255     va_list argptr;
 256     va_start(argptr, szFormat);
 257     wxVLogSysError(szFormat, argptr);
 258     va_end(argptr);
 259 }
 260
 261 void WXDLLEXPORT wxVLogSysError(long err, const wxChar *fmt, va_list argptr)
 262 {
 263     if ( wxLog::IsEnabled() ) {
 264         wxLog::OnLog(wxLOG_Error,
 265                      wxString::FormatV(fmt, argptr) + wxLogSysErrorHelper(err),
 266                      time(NULL));
 267     }
 268 }
 269
 270 void WXDLLEXPORT wxLogSysError(long lErrCode, const wxChar *szFormat, ...)
 271 {
 272     va_list argptr;
 273     va_start(argptr, szFormat);
 274     wxVLogSysError(lErrCode, szFormat, argptr);
 275     va_end(argptr);
 276 }
 277
 278 // ----------------------------------------------------------------------------
 279 // wxLog class implementation
 280 // ----------------------------------------------------------------------------
 281
 282 /* static */
 283 unsigned wxLog::DoLogNumberOfRepeats()
 284 {
 285     long retval = ms_prevCounter;
 286     wxLog *pLogger = GetActiveTarget();
 287     if ( pLogger && ms_prevCounter > 0 )
 288     {
 289         wxString msg;
 290 #if wxUSE_INTL
 291         msg.Printf(wxPLURAL("The previous message repeated once.",
 292                             "The previous message repeated %lu times.",
 293                             ms_prevCounter),
 294                    ms_prevCounter);
 295 #else
 296         msg.Printf(wxT("The previous message was repeated."));
 297 #endif
 298         ms_prevCounter = 0;
 299         ms_prevString.clear();
 300         pLogger->DoLog(ms_prevLevel, msg.c_str(), ms_prevTimeStamp);
 301     }
 302     return retval;
 303 }
 304
 305 wxLog::~wxLog()
 306 {
 307     if ( ms_prevCounter > 0 )
 308     {
 309         // looks like the repeat count has not been logged yet,
 310         // so let's do it now
 311         wxLog::DoLogNumberOfRepeats();
 312     }
 313 }
 314
 315 /* static */
 316 void wxLog::OnLog(wxLogLevel level, const wxChar *szString, time_t t)
 317 {
 318     if ( IsEnabled() && ms_logLevel >= level )
 319     {
 320         wxLog *pLogger = GetActiveTarget();
 321         if ( pLogger )
 322         {
 323             if ( GetRepetitionCounting() && ms_prevString == szString )
 324             {
 325                 ms_prevCounter++;
 326             }
 327             else
 328             {
 329                 if ( GetRepetitionCounting() )
 330                 {
 331                     pLogger->DoLogNumberOfRepeats();
 332                 }
 333                 ms_prevString = szString;
 334                 ms_prevLevel = level;
 335                 ms_prevTimeStamp = t;
 336                 pLogger->DoLog(level, szString, t);
 337             }
 338         }
 339     }
 340 }
 341
 342 // deprecated function
 343 wxChar *wxLog::SetLogBuffer(wxChar * WXUNUSED(buf), size_t WXUNUSED(size))
 344 {
 345     return NULL;
 346 }
 347
 348 wxLog *wxLog::GetActiveTarget()
 349 {
 350     if ( ms_bAutoCreate && ms_pLogger == NULL ) {
 351         // prevent infinite recursion if someone calls wxLogXXX() from
 352         // wxApp::CreateLogTarget()
 353         static bool s_bInGetActiveTarget = false;
 354         if ( !s_bInGetActiveTarget ) {
 355             s_bInGetActiveTarget = true;
 356
 357             // ask the application to create a log target for us
 358             if ( wxTheApp != NULL )
 359                 ms_pLogger = wxTheApp->GetTraits()->CreateLogTarget();
 360             else
 361                 ms_pLogger = new wxLogStderr;
 362
 363             s_bInGetActiveTarget = false;
 364
 365             // do nothing if it fails - what can we do?
 366         }
 367     }
 368
 369     return ms_pLogger;
 370 }
 371
 372 wxLog *wxLog::SetActiveTarget(wxLog *pLogger)
 373 {
 374     if ( ms_pLogger != NULL ) {
 375         // flush the old messages before changing because otherwise they might
 376         // get lost later if this target is not restored
 377         ms_pLogger->Flush();
 378     }
 379
 380     wxLog *pOldLogger = ms_pLogger;
 381     ms_pLogger = pLogger;
 382
 383     return pOldLogger;
 384 }
 385
 386 void wxLog::DontCreateOnDemand()
 387 {
 388     ms_bAutoCreate = false;
 389
 390     // this is usually called at the end of the program and we assume that it
 391     // is *always* called at the end - so we free memory here to avoid false
 392     // memory leak reports from wxWin  memory tracking code
 393     ClearTraceMasks();
 394 }
 395
 396 void wxLog::RemoveTraceMask(const wxString& str)
 397 {
 398     int index = ms_aTraceMasks.Index(str);
 399     if ( index != wxNOT_FOUND )
 400         ms_aTraceMasks.RemoveAt((size_t)index);
 401 }
 402
 403 void wxLog::ClearTraceMasks()
 404 {
 405     ms_aTraceMasks.Clear();
 406 }
 407
 408 void wxLog::TimeStamp(wxString *str)
 409 {
 410     if ( ms_timestamp )
 411     {
 412         wxChar buf[256];
 413         time_t timeNow;
 414         (void)time(&timeNow);
 415         wxStrftime(buf, WXSIZEOF(buf), ms_timestamp, localtime(&timeNow));
 416
 417         str->Empty();
 418         *str << buf << wxT(": ");
 419     }
 420 }
 421
 422 void wxLog::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
 423 {
 424     switch ( level ) {
 425         case wxLOG_FatalError:
 426             DoLogString(wxString(_("Fatal error: ")) + szString, t);
 427             DoLogString(_("Program aborted."), t);
 428             Flush();
 429 #ifdef __WXWINCE__
 430             ExitThread(3);
 431 #else
 432             abort();
 433 #endif
 434             break;
 435
 436         case wxLOG_Error:
 437             DoLogString(wxString(_("Error: ")) + szString, t);
 438             break;
 439
 440         case wxLOG_Warning:
 441             DoLogString(wxString(_("Warning: ")) + szString, t);
 442             break;
 443
 444         case wxLOG_Info:
 445             if ( GetVerbose() )
 446         case wxLOG_Message:
 447         case wxLOG_Status:
 448         default:    // log unknown log levels too
 449                 DoLogString(szString, t);
 450             break;
 451
 452         case wxLOG_Trace:
 453         case wxLOG_Debug:
 454 #ifdef __WXDEBUG__
 455             {
 456                 wxString msg = level == wxLOG_Trace ? wxT("Trace: ")
 457                                                     : wxT("Debug: ");
 458                 msg << szString;
 459                 DoLogString(msg, t);
 460             }
 461 #endif // Debug
 462             break;
 463     }
 464 }
 465
 466 void wxLog::DoLogString(const wxChar *WXUNUSED(szString), time_t WXUNUSED(t))
 467 {
 468     wxFAIL_MSG(wxT("DoLogString must be overriden if it's called."));
 469 }
 470
 471 void wxLog::Flush()
 472 {
 473     // nothing to do here
 474 }
 475
 476 /*static*/ bool wxLog::IsAllowedTraceMask(const wxChar *mask)
 477 {
 478     for ( wxArrayString::iterator it = ms_aTraceMasks.begin(),
 479                                   en = ms_aTraceMasks.end();
 480          it != en; ++it )
 481         if ( *it == mask)
 482             return true;
 483     return false;
 484 }
 485
 486 // ----------------------------------------------------------------------------
 487 // wxLogBuffer implementation
 488 // ----------------------------------------------------------------------------
 489
 490 void wxLogBuffer::Flush()
 491 {
 492     if ( !m_str.empty() )
 493     {
 494         wxMessageOutputBest out;
 495         out.Printf(_T("%s"), m_str.c_str());
 496         m_str.clear();
 497     }
 498 }
 499
 500 void wxLogBuffer::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
 501 {
 502     switch ( level )
 503     {
 504         case wxLOG_Trace:
 505         case wxLOG_Debug:
 506 #ifdef __WXDEBUG__
 507             // don't put debug messages in the buffer, we don't want to show
 508             // them to the user in a msg box, log them immediately
 509             {
 510                 wxString str;
 511                 TimeStamp(&str);
 512                 str += szString;
 513
 514                 wxMessageOutputDebug dbgout;
 515                 dbgout.Printf(_T("%s\n"), str.c_str());
 516             }
 517 #endif // __WXDEBUG__
 518             break;
 519
 520         default:
 521             wxLog::DoLog(level, szString, t);
 522     }
 523 }
 524
 525 void wxLogBuffer::DoLogString(const wxChar *szString, time_t WXUNUSED(t))
 526 {
 527     m_str << szString << _T("\n");
 528 }
 529
 530 // ----------------------------------------------------------------------------
 531 // wxLogStderr class implementation
 532 // ----------------------------------------------------------------------------
 533
 534 wxLogStderr::wxLogStderr(FILE *fp)
 535 {
 536     if ( fp == NULL )
 537         m_fp = stderr;
 538     else
 539         m_fp = fp;
 540 }
 541
 542 void wxLogStderr::DoLogString(const wxChar *szString, time_t WXUNUSED(t))
 543 {
 544     wxString str;
 545     TimeStamp(&str);
 546     str << szString;
 547
 548     fputs(str.mb_str(), m_fp);
 549     fputc(_T('\n'), m_fp);
 550     fflush(m_fp);
 551
 552     // under GUI systems such as Windows or Mac, programs usually don't have
 553     // stderr at all, so show the messages also somewhere else, typically in
 554     // the debugger window so that they go at least somewhere instead of being
 555     // simply lost
 556     if ( m_fp == stderr )
 557     {
 558         wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
 559         if ( traits && !traits->HasStderr() )
 560         {
 561             wxMessageOutputDebug dbgout;
 562             dbgout.Printf(_T("%s\n"), str.c_str());
 563         }
 564     }
 565 }
 566
 567 // ----------------------------------------------------------------------------
 568 // wxLogStream implementation
 569 // ----------------------------------------------------------------------------
 570
 571 #if wxUSE_STD_IOSTREAM
 572 #include "wx/ioswrap.h"
 573 wxLogStream::wxLogStream(wxSTD ostream *ostr)
 574 {
 575     if ( ostr == NULL )
 576         m_ostr = &wxSTD cerr;
 577     else
 578         m_ostr = ostr;
 579 }
 580
 581 void wxLogStream::DoLogString(const wxChar *szString, time_t WXUNUSED(t))
 582 {
 583     wxString str;
 584     TimeStamp(&str);
 585     (*m_ostr) << wxConvertWX2MB(str) << wxConvertWX2MB(szString) << wxSTD endl;
 586 }
 587 #endif // wxUSE_STD_IOSTREAM
 588
 589 // ----------------------------------------------------------------------------
 590 // wxLogChain
 591 // ----------------------------------------------------------------------------
 592
 593 wxLogChain::wxLogChain(wxLog *logger)
 594 {
 595     m_bPassMessages = true;
 596
 597     m_logNew = logger;
 598     m_logOld = wxLog::SetActiveTarget(this);
 599 }
 600
 601 wxLogChain::~wxLogChain()
 602 {
 603     delete m_logOld;
 604
 605     if ( m_logNew != this )
 606         delete m_logNew;
 607 }
 608
 609 void wxLogChain::SetLog(wxLog *logger)
 610 {
 611     if ( m_logNew != this )
 612         delete m_logNew;
 613
 614     m_logNew = logger;
 615 }
 616
 617 void wxLogChain::Flush()
 618 {
 619     if ( m_logOld )
 620         m_logOld->Flush();
 621
 622     // be careful to avoid infinite recursion
 623     if ( m_logNew && m_logNew != this )
 624         m_logNew->Flush();
 625 }
 626
 627 void wxLogChain::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
 628 {
 629     // let the previous logger show it
 630     if ( m_logOld && IsPassingMessages() )
 631     {
 632         // bogus cast just to access protected DoLog
 633         ((wxLogChain *)m_logOld)->DoLog(level, szString, t);
 634     }
 635
 636     if ( m_logNew && m_logNew != this )
 637     {
 638         // as above...
 639         ((wxLogChain *)m_logNew)->DoLog(level, szString, t);
 640     }
 641 }
 642
 643 // ----------------------------------------------------------------------------
 644 // wxLogPassThrough
 645 // ----------------------------------------------------------------------------
 646
 647 #ifdef __VISUALC__
 648     // "'this' : used in base member initializer list" - so what?
 649     #pragma warning(disable:4355)
 650 #endif // VC++
 651
 652 wxLogPassThrough::wxLogPassThrough()
 653                 : wxLogChain(this)
 654 {
 655 }
 656
 657 #ifdef __VISUALC__
 658     #pragma warning(default:4355)
 659 #endif // VC++
 660
 661 // ============================================================================
 662 // Global functions/variables
 663 // ============================================================================
 664
 665 // ----------------------------------------------------------------------------
 666 // static variables
 667 // ----------------------------------------------------------------------------
 668
 669 bool            wxLog::ms_bRepetCounting = false;
 670 wxString        wxLog::ms_prevString;
 671 unsigned int    wxLog::ms_prevCounter = 0;
 672 time_t          wxLog::ms_prevTimeStamp= 0;
 673 wxLogLevel      wxLog::ms_prevLevel;
 674
 675 wxLog          *wxLog::ms_pLogger      = (wxLog *)NULL;
 676 bool            wxLog::ms_doLog        = true;
 677 bool            wxLog::ms_bAutoCreate  = true;
 678 bool            wxLog::ms_bVerbose     = false;
 679
 680 wxLogLevel      wxLog::ms_logLevel     = wxLOG_Max;  // log everything by default
 681
 682 size_t          wxLog::ms_suspendCount = 0;
 683
 684 const wxChar   *wxLog::ms_timestamp    = wxT("%X");  // time only, no date
 685
 686 wxTraceMask     wxLog::ms_ulTraceMask  = (wxTraceMask)0;
 687 wxArrayString   wxLog::ms_aTraceMasks;
 688
 689 // ----------------------------------------------------------------------------
 690 // stdout error logging helper
 691 // ----------------------------------------------------------------------------
 692
 693 // helper function: wraps the message and justifies it under given position
 694 // (looks more pretty on the terminal). Also adds newline at the end.
 695 //
 696 // TODO this is now disabled until I find a portable way of determining the
 697 //      terminal window size (ok, I found it but does anybody really cares?)
 698 #ifdef LOG_PRETTY_WRAP
 699 static void wxLogWrap(FILE *f, const char *pszPrefix, const char *psz)
 700 {
 701     size_t nMax = 80; // FIXME
 702     size_t nStart = strlen(pszPrefix);
 703     fputs(pszPrefix, f);
 704
 705     size_t n;
 706     while ( *psz != '\0' ) {
 707         for ( n = nStart; (n < nMax) && (*psz != '\0'); n++ )
 708             putc(*psz++, f);
 709
 710         // wrapped?
 711         if ( *psz != '\0' ) {
 712             /*putc('\n', f);*/
 713             for ( n = 0; n < nStart; n++ )
 714                 putc(' ', f);
 715
 716             // as we wrapped, squeeze all white space
 717             while ( isspace(*psz) )
 718                 psz++;
 719         }
 720     }
 721
 722     putc('\n', f);
 723 }
 724 #endif  //LOG_PRETTY_WRAP
 725
 726 // ----------------------------------------------------------------------------
 727 // error code/error message retrieval functions
 728 // ----------------------------------------------------------------------------
 729
 730 // get error code from syste
 731 unsigned long wxSysErrorCode()
 732 {
 733 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 734     return ::GetLastError();
 735 #else   //Unix
 736     return errno;
 737 #endif  //Win/Unix
 738 }
 739
 740 // get error message from system
 741 const wxChar *wxSysErrorMsg(unsigned long nErrCode)
 742 {
 743     if ( nErrCode == 0 )
 744         nErrCode = wxSysErrorCode();
 745
 746 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 747     static wxChar s_szBuf[1024];
 748
 749     // get error message from system
 750     LPVOID lpMsgBuf;
 751     if ( ::FormatMessage
 752          (
 753             FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
 754             NULL,
 755             nErrCode,
 756             MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
 757             (LPTSTR)&lpMsgBuf,
 758             0,
 759             NULL
 760          ) == 0 )
 761     {
 762         // if this happens, something is seriously wrong, so don't use _() here
 763         // for safety
 764         wxSprintf(s_szBuf, _T("unknown error %lx"), nErrCode);
 765         return s_szBuf;
 766     }
 767
 768
 769     // copy it to our buffer and free memory
 770     // Crashes on SmartPhone (FIXME)
 771 #if !defined(__SMARTPHONE__) /* of WinCE */
 772     if( lpMsgBuf != 0 )
 773     {
 774         wxStrncpy(s_szBuf, (const wxChar *)lpMsgBuf, WXSIZEOF(s_szBuf) - 1);
 775         s_szBuf[WXSIZEOF(s_szBuf) - 1] = wxT('\0');
 776
 777         LocalFree(lpMsgBuf);
 778
 779         // returned string is capitalized and ended with '\r\n' - bad
 780         s_szBuf[0] = (wxChar)wxTolower(s_szBuf[0]);
 781         size_t len = wxStrlen(s_szBuf);
 782         if ( len > 0 ) {
 783             // truncate string
 784             if ( s_szBuf[len - 2] == wxT('\r') )
 785                 s_szBuf[len - 2] = wxT('\0');
 786         }
 787     }
 788     else
 789 #endif // !__SMARTPHONE__
 790     {
 791         s_szBuf[0] = wxT('\0');
 792     }
 793
 794     return s_szBuf;
 795 #else // !__WXMSW__
 796     #if wxUSE_UNICODE
 797         static wchar_t s_wzBuf[1024];
 798         wxConvCurrent->MB2WC(s_wzBuf, strerror((int)nErrCode),
 799                              WXSIZEOF(s_wzBuf) - 1);
 800         return s_wzBuf;
 801     #else
 802         return strerror((int)nErrCode);
 803     #endif
 804 #endif  // __WXMSW__/!__WXMSW__
 805 }
 806
 807 #endif // wxUSE_LOG