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 licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21     #pragma implementation "log.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #if wxUSE_LOG
  32
  33 // wxWidgets
  34 #ifndef WX_PRECOMP
  35     #include "wx/app.h"
  36     #include "wx/arrstr.h"
  37     #include "wx/intl.h"
  38     #include "wx/string.h"
  39 #endif //WX_PRECOMP
  40
  41 #include "wx/apptrait.h"
  42 #include "wx/file.h"
  43 #include "wx/log.h"
  44 #include "wx/msgout.h"
  45 #include "wx/textfile.h"
  46 #include "wx/thread.h"
  47 #include "wx/utils.h"
  48 #include "wx/wxchar.h"
  49
  50 // other standard headers
  51 #ifndef __WXWINCE__
  52 #include <errno.h>
  53 #endif
  54
  55 #include <stdlib.h>
  56
  57 #ifndef __WXWINCE__
  58 #include <time.h>
  59 #else
  60 #include "wx/msw/wince/time.h"
  61 #endif
  62
  63 #if defined(__WINDOWS__)
  64     #include "wx/msw/private.h" // includes windows.h
  65 #endif
  66
  67 // ----------------------------------------------------------------------------
  68 // non member functions
  69 // ----------------------------------------------------------------------------
  70
  71 // define this to enable wrapping of log messages
  72 //#define LOG_PRETTY_WRAP
  73
  74 #ifdef  LOG_PRETTY_WRAP
  75   static void wxLogWrap(FILE *f, const char *pszPrefix, const char *psz);
  76 #endif
  77
  78 // ============================================================================
  79 // implementation
  80 // ============================================================================
  81
  82 // ----------------------------------------------------------------------------
  83 // globals
  84 // ----------------------------------------------------------------------------
  85
  86 // log functions can't allocate memory (LogError("out of memory...") should
  87 // work!), so we use a static buffer for all log messages
  88 #define LOG_BUFFER_SIZE   (4096)
  89
  90 // static buffer for error messages
  91 static wxChar   s_szBufStatic[LOG_BUFFER_SIZE];
  92
  93 static wxChar  *s_szBuf     = s_szBufStatic;
  94 static size_t   s_szBufSize = WXSIZEOF( s_szBufStatic );
  95
  96 #if wxUSE_THREADS
  97
  98 // the critical section protecting the static buffer
  99 static wxCriticalSection gs_csLogBuf;
 100
 101 #endif // wxUSE_THREADS
 102
 103 // return true if we have a non NULL non disabled log target
 104 static inline bool IsLoggingEnabled()
 105 {
 106     return wxLog::IsEnabled() && (wxLog::GetActiveTarget() != NULL);
 107 }
 108
 109 // ----------------------------------------------------------------------------
 110 // implementation of Log functions
 111 //
 112 // NB: unfortunately we need all these distinct functions, we can't make them
 113 //     macros and not all compilers inline vararg functions.
 114 // ----------------------------------------------------------------------------
 115
 116 // wrapper for wxVsnprintf(s_szBuf) which always NULL-terminates it
 117 static inline void PrintfInLogBug(const wxChar *szFormat, va_list argptr)
 118 {
 119     if ( wxVsnprintf(s_szBuf, s_szBufSize, szFormat, argptr) < 0 )
 120     {
 121         // must NUL-terminate it manually
 122         s_szBuf[s_szBufSize - 1] = _T('\0');
 123     }
 124     //else: NUL-terminated by vsnprintf()
 125 }
 126
 127 // generic log function
 128 void wxVLogGeneric(wxLogLevel level, const wxChar *szFormat, va_list argptr)
 129 {
 130     if ( IsLoggingEnabled() ) {
 131         wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);
 132
 133         PrintfInLogBug(szFormat, argptr);
 134
 135         wxLog::OnLog(level, s_szBuf, time(NULL));
 136     }
 137 }
 138
 139 void wxLogGeneric(wxLogLevel level, const wxChar *szFormat, ...)
 140 {
 141     va_list argptr;
 142     va_start(argptr, szFormat);
 143     wxVLogGeneric(level, szFormat, argptr);
 144     va_end(argptr);
 145 }
 146
 147 #define IMPLEMENT_LOG_FUNCTION(level)                               \
 148   void wxVLog##level(const wxChar *szFormat, va_list argptr)        \
 149   {                                                                 \
 150     if ( IsLoggingEnabled() ) {                                     \
 151       wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);                      \
 152                                                                     \
 153       PrintfInLogBug(szFormat, argptr);                             \
 154                                                                     \
 155       wxLog::OnLog(wxLOG_##level, s_szBuf, time(NULL));             \
 156     }                                                               \
 157   }                                                                 \
 158                                                                     \
 159   void wxLog##level(const wxChar *szFormat, ...)                    \
 160   {                                                                 \
 161     va_list argptr;                                                 \
 162     va_start(argptr, szFormat);                                     \
 163     wxVLog##level(szFormat, argptr);                                \
 164     va_end(argptr);                                                 \
 165   }
 166
 167 IMPLEMENT_LOG_FUNCTION(Error)
 168 IMPLEMENT_LOG_FUNCTION(Warning)
 169 IMPLEMENT_LOG_FUNCTION(Message)
 170 IMPLEMENT_LOG_FUNCTION(Info)
 171 IMPLEMENT_LOG_FUNCTION(Status)
 172
 173 void wxSafeShowMessage(const wxString& title, const wxString& text)
 174 {
 175 #ifdef __WINDOWS__
 176     ::MessageBox(NULL, text, title, MB_OK | MB_ICONSTOP);
 177 #else
 178     wxFprintf(stderr, _T("%s: %s\n"), title.c_str(), text.c_str());
 179 #endif
 180 }
 181
 182 // fatal errors can't be suppressed nor handled by the custom log target and
 183 // always terminate the program
 184 void wxVLogFatalError(const wxChar *szFormat, va_list argptr)
 185 {
 186     wxVsnprintf(s_szBuf, s_szBufSize, szFormat, argptr);
 187
 188     wxSafeShowMessage(_T("Fatal Error"), s_szBuf);
 189
 190 #ifdef __WXWINCE__
 191     ExitThread(3);
 192 #else
 193     abort();
 194 #endif
 195 }
 196
 197 void wxLogFatalError(const wxChar *szFormat, ...)
 198 {
 199     va_list argptr;
 200     va_start(argptr, szFormat);
 201     wxVLogFatalError(szFormat, argptr);
 202
 203     // some compilers warn about unreachable code and it shouldn't matter
 204     // for the others anyhow...
 205     //va_end(argptr);
 206 }
 207
 208 // same as info, but only if 'verbose' mode is on
 209 void wxVLogVerbose(const wxChar *szFormat, va_list argptr)
 210 {
 211     if ( IsLoggingEnabled() ) {
 212         wxLog *pLog = wxLog::GetActiveTarget();
 213         if ( pLog != NULL && pLog->GetVerbose() ) {
 214             wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);
 215
 216             wxVsnprintf(s_szBuf, s_szBufSize, szFormat, argptr);
 217
 218             wxLog::OnLog(wxLOG_Info, s_szBuf, time(NULL));
 219         }
 220     }
 221 }
 222
 223 void wxLogVerbose(const wxChar *szFormat, ...)
 224 {
 225     va_list argptr;
 226     va_start(argptr, szFormat);
 227     wxVLogVerbose(szFormat, argptr);
 228     va_end(argptr);
 229 }
 230
 231 // debug functions
 232 #ifdef __WXDEBUG__
 233 #define IMPLEMENT_LOG_DEBUG_FUNCTION(level)                         \
 234   void wxVLog##level(const wxChar *szFormat, va_list argptr)        \
 235   {                                                                 \
 236     if ( IsLoggingEnabled() ) {                                     \
 237       wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);                      \
 238                                                                     \
 239       wxVsnprintf(s_szBuf, s_szBufSize, szFormat, argptr);    \
 240                                                                     \
 241       wxLog::OnLog(wxLOG_##level, s_szBuf, time(NULL));             \
 242     }                                                               \
 243   }                                                                 \
 244   void wxLog##level(const wxChar *szFormat, ...)                    \
 245   {                                                                 \
 246     va_list argptr;                                                 \
 247     va_start(argptr, szFormat);                                     \
 248     wxVLog##level(szFormat, argptr);                                \
 249     va_end(argptr);                                                 \
 250   }
 251
 252   void wxVLogTrace(const wxChar *mask, const wxChar *szFormat, va_list argptr)
 253   {
 254     if ( IsLoggingEnabled() && wxLog::IsAllowedTraceMask(mask) ) {
 255       wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);
 256
 257       wxChar *p = s_szBuf;
 258       size_t len = s_szBufSize;
 259       wxStrncpy(s_szBuf, _T("("), len);
 260       len -= 1; // strlen("(")
 261       p += 1;
 262       wxStrncat(p, mask, len);
 263       size_t lenMask = wxStrlen(mask);
 264       len -= lenMask;
 265       p += lenMask;
 266
 267       wxStrncat(p, _T(") "), len);
 268       len -= 2;
 269       p += 2;
 270
 271       wxVsnprintf(p, len, szFormat, argptr);
 272
 273       wxLog::OnLog(wxLOG_Trace, s_szBuf, time(NULL));
 274     }
 275   }
 276
 277   void wxLogTrace(const wxChar *mask, const wxChar *szFormat, ...)
 278   {
 279     va_list argptr;
 280     va_start(argptr, szFormat);
 281     wxVLogTrace(mask, szFormat, argptr);
 282     va_end(argptr);
 283   }
 284
 285   void wxVLogTrace(wxTraceMask mask, const wxChar *szFormat, va_list argptr)
 286   {
 287     // we check that all of mask bits are set in the current mask, so
 288     // that wxLogTrace(wxTraceRefCount | wxTraceOle) will only do something
 289     // if both bits are set.
 290     if ( IsLoggingEnabled() && ((wxLog::GetTraceMask() & mask) == mask) ) {
 291       wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);
 292
 293       wxVsnprintf(s_szBuf, s_szBufSize, szFormat, argptr);
 294
 295       wxLog::OnLog(wxLOG_Trace, s_szBuf, time(NULL));
 296     }
 297   }
 298
 299   void wxLogTrace(wxTraceMask mask, const wxChar *szFormat, ...)
 300   {
 301     va_list argptr;
 302     va_start(argptr, szFormat);
 303     wxVLogTrace(mask, szFormat, argptr);
 304     va_end(argptr);
 305   }
 306
 307 #else // release
 308   #define IMPLEMENT_LOG_DEBUG_FUNCTION(level)
 309 #endif
 310
 311 IMPLEMENT_LOG_DEBUG_FUNCTION(Debug)
 312 IMPLEMENT_LOG_DEBUG_FUNCTION(Trace)
 313
 314 // wxLogSysError: one uses the last error code, for other  you must give it
 315 // explicitly
 316
 317 // common part of both wxLogSysError
 318 void wxLogSysErrorHelper(long lErrCode)
 319 {
 320     wxChar szErrMsg[LOG_BUFFER_SIZE / 2];
 321     wxSnprintf(szErrMsg, WXSIZEOF(szErrMsg),
 322                _(" (error %ld: %s)"), lErrCode, wxSysErrorMsg(lErrCode));
 323     wxStrncat(s_szBuf, szErrMsg, s_szBufSize - wxStrlen(s_szBuf));
 324
 325     wxLog::OnLog(wxLOG_Error, s_szBuf, time(NULL));
 326 }
 327
 328 void WXDLLEXPORT wxVLogSysError(const wxChar *szFormat, va_list argptr)
 329 {
 330     if ( IsLoggingEnabled() ) {
 331         wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);
 332
 333         wxVsnprintf(s_szBuf, s_szBufSize, szFormat, argptr);
 334
 335         wxLogSysErrorHelper(wxSysErrorCode());
 336     }
 337 }
 338
 339 void WXDLLEXPORT wxLogSysError(const wxChar *szFormat, ...)
 340 {
 341     va_list argptr;
 342     va_start(argptr, szFormat);
 343     wxVLogSysError(szFormat, argptr);
 344     va_end(argptr);
 345 }
 346
 347 void WXDLLEXPORT wxVLogSysError(long lErrCode, const wxChar *szFormat, va_list argptr)
 348 {
 349     if ( IsLoggingEnabled() ) {
 350         wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);
 351
 352         wxVsnprintf(s_szBuf, s_szBufSize, szFormat, argptr);
 353
 354         wxLogSysErrorHelper(lErrCode);
 355     }
 356 }
 357
 358 void WXDLLEXPORT wxLogSysError(long lErrCode, const wxChar *szFormat, ...)
 359 {
 360     va_list argptr;
 361     va_start(argptr, szFormat);
 362     wxVLogSysError(lErrCode, szFormat, argptr);
 363     va_end(argptr);
 364 }
 365
 366 // ----------------------------------------------------------------------------
 367 // wxLog class implementation
 368 // ----------------------------------------------------------------------------
 369
 370 wxChar *wxLog::SetLogBuffer( wxChar *buf, size_t size)
 371 {
 372     wxChar *oldbuf = s_szBuf;
 373
 374     if( buf == 0 )
 375     {
 376         s_szBuf = s_szBufStatic;
 377         s_szBufSize = WXSIZEOF( s_szBufStatic );
 378     }
 379     else
 380     {
 381         s_szBuf = buf;
 382         s_szBufSize = size;
 383     }
 384
 385     return (oldbuf == s_szBufStatic ) ? 0 : oldbuf;
 386 }
 387
 388 wxLog *wxLog::GetActiveTarget()
 389 {
 390     if ( ms_bAutoCreate && ms_pLogger == NULL ) {
 391         // prevent infinite recursion if someone calls wxLogXXX() from
 392         // wxApp::CreateLogTarget()
 393         static bool s_bInGetActiveTarget = false;
 394         if ( !s_bInGetActiveTarget ) {
 395             s_bInGetActiveTarget = true;
 396
 397             // ask the application to create a log target for us
 398             if ( wxTheApp != NULL )
 399                 ms_pLogger = wxTheApp->GetTraits()->CreateLogTarget();
 400             else
 401                 ms_pLogger = new wxLogStderr;
 402
 403             s_bInGetActiveTarget = false;
 404
 405             // do nothing if it fails - what can we do?
 406         }
 407     }
 408
 409     return ms_pLogger;
 410 }
 411
 412 wxLog *wxLog::SetActiveTarget(wxLog *pLogger)
 413 {
 414     if ( ms_pLogger != NULL ) {
 415         // flush the old messages before changing because otherwise they might
 416         // get lost later if this target is not restored
 417         ms_pLogger->Flush();
 418     }
 419
 420     wxLog *pOldLogger = ms_pLogger;
 421     ms_pLogger = pLogger;
 422
 423     return pOldLogger;
 424 }
 425
 426 void wxLog::DontCreateOnDemand()
 427 {
 428     ms_bAutoCreate = false;
 429
 430     // this is usually called at the end of the program and we assume that it
 431     // is *always* called at the end - so we free memory here to avoid false
 432     // memory leak reports from wxWin  memory tracking code
 433     ClearTraceMasks();
 434 }
 435
 436 void wxLog::RemoveTraceMask(const wxString& str)
 437 {
 438     int index = ms_aTraceMasks.Index(str);
 439     if ( index != wxNOT_FOUND )
 440         ms_aTraceMasks.RemoveAt((size_t)index);
 441 }
 442
 443 void wxLog::ClearTraceMasks()
 444 {
 445     ms_aTraceMasks.Clear();
 446 }
 447
 448 void wxLog::TimeStamp(wxString *str)
 449 {
 450     if ( ms_timestamp )
 451     {
 452         wxChar buf[256];
 453         time_t timeNow;
 454         (void)time(&timeNow);
 455         wxStrftime(buf, WXSIZEOF(buf), ms_timestamp, localtime(&timeNow));
 456
 457         str->Empty();
 458         *str << buf << wxT(": ");
 459     }
 460 }
 461
 462 void wxLog::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
 463 {
 464     switch ( level ) {
 465         case wxLOG_FatalError:
 466             DoLogString(wxString(_("Fatal error: ")) + szString, t);
 467             DoLogString(_("Program aborted."), t);
 468             Flush();
 469 #ifdef __WXWINCE__
 470             ExitThread(3);
 471 #else
 472             abort();
 473 #endif
 474             break;
 475
 476         case wxLOG_Error:
 477             DoLogString(wxString(_("Error: ")) + szString, t);
 478             break;
 479
 480         case wxLOG_Warning:
 481             DoLogString(wxString(_("Warning: ")) + szString, t);
 482             break;
 483
 484         case wxLOG_Info:
 485             if ( GetVerbose() )
 486         case wxLOG_Message:
 487         case wxLOG_Status:
 488         default:    // log unknown log levels too
 489                 DoLogString(szString, t);
 490             break;
 491
 492         case wxLOG_Trace:
 493         case wxLOG_Debug:
 494 #ifdef __WXDEBUG__
 495             {
 496                 wxString msg = level == wxLOG_Trace ? wxT("Trace: ")
 497                                                     : wxT("Debug: ");
 498                 msg << szString;
 499                 DoLogString(msg, t);
 500             }
 501 #endif // Debug
 502             break;
 503     }
 504 }
 505
 506 void wxLog::DoLogString(const wxChar *WXUNUSED(szString), time_t WXUNUSED(t))
 507 {
 508     wxFAIL_MSG(wxT("DoLogString must be overriden if it's called."));
 509 }
 510
 511 void wxLog::Flush()
 512 {
 513     // nothing to do here
 514 }
 515
 516 /*static*/ bool wxLog::IsAllowedTraceMask(const wxChar *mask)
 517 {
 518     for ( wxArrayString::iterator it = ms_aTraceMasks.begin(),
 519                                   en = ms_aTraceMasks.end();
 520          it != en; ++it )
 521         if ( *it == mask)
 522             return true;
 523     return false;
 524 }
 525
 526 // ----------------------------------------------------------------------------
 527 // wxLogStderr class implementation
 528 // ----------------------------------------------------------------------------
 529
 530 wxLogStderr::wxLogStderr(FILE *fp)
 531 {
 532     if ( fp == NULL )
 533         m_fp = stderr;
 534     else
 535         m_fp = fp;
 536 }
 537
 538 void wxLogStderr::DoLogString(const wxChar *szString, time_t WXUNUSED(t))
 539 {
 540     wxString str;
 541     TimeStamp(&str);
 542     str << szString;
 543
 544     fputs(str.mb_str(), m_fp);
 545     fputc(_T('\n'), m_fp);
 546     fflush(m_fp);
 547
 548     // under GUI systems such as Windows or Mac, programs usually don't have
 549     // stderr at all, so show the messages also somewhere else, typically in
 550     // the debugger window so that they go at least somewhere instead of being
 551     // simply lost
 552     if ( m_fp == stderr )
 553     {
 554         wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
 555         if ( traits && !traits->HasStderr() )
 556         {
 557             wxMessageOutputDebug dbgout;
 558             dbgout.Printf(_T("%s\n"), str.c_str());
 559         }
 560     }
 561 }
 562
 563 // ----------------------------------------------------------------------------
 564 // wxLogStream implementation
 565 // ----------------------------------------------------------------------------
 566
 567 #if wxUSE_STD_IOSTREAM
 568 #include "wx/ioswrap.h"
 569 wxLogStream::wxLogStream(wxSTD ostream *ostr)
 570 {
 571     if ( ostr == NULL )
 572         m_ostr = &wxSTD cerr;
 573     else
 574         m_ostr = ostr;
 575 }
 576
 577 void wxLogStream::DoLogString(const wxChar *szString, time_t WXUNUSED(t))
 578 {
 579     wxString str;
 580     TimeStamp(&str);
 581     (*m_ostr) << str << wxConvertWX2MB(szString) << wxSTD endl;
 582 }
 583 #endif // wxUSE_STD_IOSTREAM
 584
 585 // ----------------------------------------------------------------------------
 586 // wxLogChain
 587 // ----------------------------------------------------------------------------
 588
 589 wxLogChain::wxLogChain(wxLog *logger)
 590 {
 591     m_bPassMessages = true;
 592
 593     m_logNew = logger;
 594     m_logOld = wxLog::SetActiveTarget(this);
 595 }
 596
 597 wxLogChain::~wxLogChain()
 598 {
 599     delete m_logOld;
 600
 601     if ( m_logNew != this )
 602         delete m_logNew;
 603 }
 604
 605 void wxLogChain::SetLog(wxLog *logger)
 606 {
 607     if ( m_logNew != this )
 608         delete m_logNew;
 609
 610     m_logNew = logger;
 611 }
 612
 613 void wxLogChain::Flush()
 614 {
 615     if ( m_logOld )
 616         m_logOld->Flush();
 617
 618     // be careful to avoid infinite recursion
 619     if ( m_logNew && m_logNew != this )
 620         m_logNew->Flush();
 621 }
 622
 623 void wxLogChain::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
 624 {
 625     // let the previous logger show it
 626     if ( m_logOld && IsPassingMessages() )
 627     {
 628         // bogus cast just to access protected DoLog
 629         ((wxLogChain *)m_logOld)->DoLog(level, szString, t);
 630     }
 631
 632     if ( m_logNew && m_logNew != this )
 633     {
 634         // as above...
 635         ((wxLogChain *)m_logNew)->DoLog(level, szString, t);
 636     }
 637 }
 638
 639 // ----------------------------------------------------------------------------
 640 // wxLogPassThrough
 641 // ----------------------------------------------------------------------------
 642
 643 #ifdef __VISUALC__
 644     // "'this' : used in base member initializer list" - so what?
 645     #pragma warning(disable:4355)
 646 #endif // VC++
 647
 648 wxLogPassThrough::wxLogPassThrough()
 649                 : wxLogChain(this)
 650 {
 651 }
 652
 653 #ifdef __VISUALC__
 654     #pragma warning(default:4355)
 655 #endif // VC++
 656
 657 // ============================================================================
 658 // Global functions/variables
 659 // ============================================================================
 660
 661 // ----------------------------------------------------------------------------
 662 // static variables
 663 // ----------------------------------------------------------------------------
 664
 665 wxLog          *wxLog::ms_pLogger      = (wxLog *)NULL;
 666 bool            wxLog::ms_doLog        = true;
 667 bool            wxLog::ms_bAutoCreate  = true;
 668 bool            wxLog::ms_bVerbose     = false;
 669
 670 wxLogLevel      wxLog::ms_logLevel     = wxLOG_Max;  // log everything by default
 671
 672 size_t          wxLog::ms_suspendCount = 0;
 673
 674 const wxChar   *wxLog::ms_timestamp    = wxT("%X");  // time only, no date
 675
 676 wxTraceMask     wxLog::ms_ulTraceMask  = (wxTraceMask)0;
 677 wxArrayString   wxLog::ms_aTraceMasks;
 678
 679 // ----------------------------------------------------------------------------
 680 // stdout error logging helper
 681 // ----------------------------------------------------------------------------
 682
 683 // helper function: wraps the message and justifies it under given position
 684 // (looks more pretty on the terminal). Also adds newline at the end.
 685 //
 686 // TODO this is now disabled until I find a portable way of determining the
 687 //      terminal window size (ok, I found it but does anybody really cares?)
 688 #ifdef LOG_PRETTY_WRAP
 689 static void wxLogWrap(FILE *f, const char *pszPrefix, const char *psz)
 690 {
 691     size_t nMax = 80; // FIXME
 692     size_t nStart = strlen(pszPrefix);
 693     fputs(pszPrefix, f);
 694
 695     size_t n;
 696     while ( *psz != '\0' ) {
 697         for ( n = nStart; (n < nMax) && (*psz != '\0'); n++ )
 698             putc(*psz++, f);
 699
 700         // wrapped?
 701         if ( *psz != '\0' ) {
 702             /*putc('\n', f);*/
 703             for ( n = 0; n < nStart; n++ )
 704                 putc(' ', f);
 705
 706             // as we wrapped, squeeze all white space
 707             while ( isspace(*psz) )
 708                 psz++;
 709         }
 710     }
 711
 712     putc('\n', f);
 713 }
 714 #endif  //LOG_PRETTY_WRAP
 715
 716 // ----------------------------------------------------------------------------
 717 // error code/error message retrieval functions
 718 // ----------------------------------------------------------------------------
 719
 720 // get error code from syste
 721 unsigned long wxSysErrorCode()
 722 {
 723 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 724     return ::GetLastError();
 725 #else   //Unix
 726     return errno;
 727 #endif  //Win/Unix
 728 }
 729
 730 // get error message from system
 731 const wxChar *wxSysErrorMsg(unsigned long nErrCode)
 732 {
 733     if ( nErrCode == 0 )
 734         nErrCode = wxSysErrorCode();
 735
 736 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 737     static wxChar s_szBuf[LOG_BUFFER_SIZE / 2];
 738
 739     // get error message from system
 740     LPVOID lpMsgBuf;
 741     FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
 742             NULL, nErrCode,
 743             MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
 744             (LPTSTR)&lpMsgBuf,
 745             0, NULL);
 746
 747     // copy it to our buffer and free memory
 748     // Crashes on SmartPhone
 749 #if !defined(__SMARTPHONE__) /* of WinCE */
 750      if( lpMsgBuf != 0 ) {
 751         wxStrncpy(s_szBuf, (const wxChar *)lpMsgBuf, WXSIZEOF(s_szBuf) - 1);
 752         s_szBuf[WXSIZEOF(s_szBuf) - 1] = wxT('\0');
 753
 754         LocalFree(lpMsgBuf);
 755
 756         // returned string is capitalized and ended with '\r\n' - bad
 757         s_szBuf[0] = (wxChar)wxTolower(s_szBuf[0]);
 758         size_t len = wxStrlen(s_szBuf);
 759         if ( len > 0 ) {
 760             // truncate string
 761             if ( s_szBuf[len - 2] == wxT('\r') )
 762                 s_szBuf[len - 2] = wxT('\0');
 763         }
 764     }
 765     else
 766 #endif
 767     {
 768         s_szBuf[0] = wxT('\0');
 769     }
 770
 771     return s_szBuf;
 772 #else   // Unix-WXMICROWIN
 773 #if wxUSE_UNICODE
 774     static wxChar s_szBuf[LOG_BUFFER_SIZE / 2];
 775     wxConvCurrent->MB2WC(s_szBuf, strerror(nErrCode), WXSIZEOF(s_szBuf) -1);
 776     return s_szBuf;
 777 #else
 778     return strerror((int)nErrCode);
 779 #endif
 780 #endif  // Win/Unix-WXMICROWIN
 781 }
 782
 783 #endif // wxUSE_LOG
 784