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/datetime.h"
  41 #include "wx/file.h"
  42 #include "wx/msgout.h"
  43 #include "wx/textfile.h"
  44 #include "wx/thread.h"
  45 #include "wx/wxchar.h"
  46
  47 // other standard headers
  48 #ifndef __WXWINCE__
  49 #include <errno.h>
  50 #endif
  51
  52 #include <stdlib.h>
  53
  54 #ifndef __WXWINCE__
  55 #include <time.h>
  56 #else
  57 #include "wx/msw/wince/time.h"
  58 #endif
  59
  60 #if defined(__WINDOWS__)
  61     #include "wx/msw/private.h" // includes windows.h
  62 #endif
  63
  64 // ----------------------------------------------------------------------------
  65 // non member functions
  66 // ----------------------------------------------------------------------------
  67
  68 // define this to enable wrapping of log messages
  69 //#define LOG_PRETTY_WRAP
  70
  71 #ifdef  LOG_PRETTY_WRAP
  72   static void wxLogWrap(FILE *f, const char *pszPrefix, const char *psz);
  73 #endif
  74
  75 // ============================================================================
  76 // implementation
  77 // ============================================================================
  78
  79 // ----------------------------------------------------------------------------
  80 // implementation of Log functions
  81 //
  82 // NB: unfortunately we need all these distinct functions, we can't make them
  83 //     macros and not all compilers inline vararg functions.
  84 // ----------------------------------------------------------------------------
  85
  86 // generic log function
  87 void wxVLogGeneric(wxLogLevel level, const wxString& format, va_list argptr)
  88 {
  89     if ( wxLog::IsEnabled() ) {
  90         wxLog::OnLog(level, wxString::FormatV(format, argptr), time(NULL));
  91     }
  92 }
  93
  94 void wxDoLogGeneric(wxLogLevel level, const wxChar *szFormat, ...)
  95 {
  96     va_list argptr;
  97     va_start(argptr, szFormat);
  98     wxVLogGeneric(level, szFormat, argptr);
  99     va_end(argptr);
 100 }
 101
 102 #define IMPLEMENT_LOG_FUNCTION(level)                               \
 103   void wxVLog##level(const wxString& format, va_list argptr)        \
 104   {                                                                 \
 105     if ( wxLog::IsEnabled() ) {                                     \
 106       wxLog::OnLog(wxLOG_##level,                                   \
 107                    wxString::FormatV(format, argptr), time(NULL));  \
 108     }                                                               \
 109   }                                                                 \
 110                                                                     \
 111   void wxDoLog##level(const wxChar *szFormat, ...)                  \
 112   {                                                                 \
 113     va_list argptr;                                                 \
 114     va_start(argptr, szFormat);                                     \
 115     wxVLog##level(szFormat, argptr);                                \
 116     va_end(argptr);                                                 \
 117   }
 118
 119 IMPLEMENT_LOG_FUNCTION(Error)
 120 IMPLEMENT_LOG_FUNCTION(Warning)
 121 IMPLEMENT_LOG_FUNCTION(Message)
 122 IMPLEMENT_LOG_FUNCTION(Info)
 123 IMPLEMENT_LOG_FUNCTION(Status)
 124
 125 void wxSafeShowMessage(const wxString& title, const wxString& text)
 126 {
 127 #ifdef __WINDOWS__
 128     ::MessageBox(NULL, text, title, MB_OK | MB_ICONSTOP);
 129 #else
 130     wxFprintf(stderr, _T("%s: %s\n"), title.c_str(), text.c_str());
 131     fflush(stderr);
 132 #endif
 133 }
 134
 135 // fatal errors can't be suppressed nor handled by the custom log target and
 136 // always terminate the program
 137 void wxVLogFatalError(const wxString& format, va_list argptr)
 138 {
 139     wxSafeShowMessage(_T("Fatal Error"), wxString::FormatV(format, argptr));
 140
 141 #ifdef __WXWINCE__
 142     ExitThread(3);
 143 #else
 144     abort();
 145 #endif
 146 }
 147
 148 void wxDoLogFatalError(const wxChar *szFormat, ...)
 149 {
 150     va_list argptr;
 151     va_start(argptr, szFormat);
 152     wxVLogFatalError(szFormat, argptr);
 153
 154     // some compilers warn about unreachable code and it shouldn't matter
 155     // for the others anyhow...
 156     //va_end(argptr);
 157 }
 158
 159 // same as info, but only if 'verbose' mode is on
 160 void wxVLogVerbose(const wxString& format, va_list argptr)
 161 {
 162     if ( wxLog::IsEnabled() ) {
 163         if ( wxLog::GetActiveTarget() != NULL && wxLog::GetVerbose() ) {
 164             wxLog::OnLog(wxLOG_Info,
 165                          wxString::FormatV(format, argptr), time(NULL));
 166         }
 167     }
 168 }
 169
 170 void wxDoLogVerbose(const wxChar *szFormat, ...)
 171 {
 172     va_list argptr;
 173     va_start(argptr, szFormat);
 174     wxVLogVerbose(szFormat, argptr);
 175     va_end(argptr);
 176 }
 177
 178 // debug functions
 179 #ifdef __WXDEBUG__
 180 #define IMPLEMENT_LOG_DEBUG_FUNCTION(level)                         \
 181   void wxVLog##level(const wxChar *szFormat, va_list argptr)        \
 182   {                                                                 \
 183     if ( wxLog::IsEnabled() ) {                                     \
 184       wxLog::OnLog(wxLOG_##level,                                   \
 185                    wxString::FormatV(szFormat, argptr), time(NULL));\
 186     }                                                               \
 187   }                                                                 \
 188                                                                     \
 189   void wxDoLog##level(const wxChar *szFormat, ...)                  \
 190   {                                                                 \
 191     va_list argptr;                                                 \
 192     va_start(argptr, szFormat);                                     \
 193     wxVLog##level(szFormat, argptr);                                \
 194     va_end(argptr);                                                 \
 195   }
 196
 197   void wxVLogTrace(const wxString& mask, const wxString& format, va_list argptr)
 198   {
 199     if ( wxLog::IsEnabled() && wxLog::IsAllowedTraceMask(mask) ) {
 200       wxString msg;
 201       msg << _T("(") << mask << _T(") ") << wxString::FormatV(format, argptr);
 202
 203       wxLog::OnLog(wxLOG_Trace, msg, time(NULL));
 204     }
 205   }
 206
 207   void wxDoLogTrace(const wxString& mask, const wxChar *szFormat, ...)
 208   {
 209     va_list argptr;
 210     va_start(argptr, szFormat);
 211     wxVLogTrace(mask, szFormat, argptr);
 212     va_end(argptr);
 213   }
 214
 215   void wxVLogTrace(wxTraceMask mask, const wxString& format, va_list argptr)
 216   {
 217     // we check that all of mask bits are set in the current mask, so
 218     // that wxLogTrace(wxTraceRefCount | wxTraceOle) will only do something
 219     // if both bits are set.
 220     if ( wxLog::IsEnabled() && ((wxLog::GetTraceMask() & mask) == mask) ) {
 221       wxLog::OnLog(wxLOG_Trace, wxString::FormatV(format, argptr), time(NULL));
 222     }
 223   }
 224
 225   void wxDoLogTrace(wxTraceMask mask, const wxChar *szFormat, ...)
 226   {
 227     va_list argptr;
 228     va_start(argptr, szFormat);
 229     wxVLogTrace(mask, szFormat, argptr);
 230     va_end(argptr);
 231   }
 232
 233 #else // release
 234   #define IMPLEMENT_LOG_DEBUG_FUNCTION(level)
 235 #endif
 236
 237 IMPLEMENT_LOG_DEBUG_FUNCTION(Debug)
 238 IMPLEMENT_LOG_DEBUG_FUNCTION(Trace)
 239
 240 // wxLogSysError: one uses the last error code, for other  you must give it
 241 // explicitly
 242
 243 // return the system error message description
 244 static inline wxString wxLogSysErrorHelper(long err)
 245 {
 246     return wxString::Format(_(" (error %ld: %s)"), err, wxSysErrorMsg(err));
 247 }
 248
 249 void WXDLLEXPORT wxVLogSysError(const wxString& format, va_list argptr)
 250 {
 251     wxVLogSysError(wxSysErrorCode(), format, argptr);
 252 }
 253
 254 void WXDLLEXPORT wxDoLogSysError(const wxChar *szFormat, ...)
 255 {
 256     va_list argptr;
 257     va_start(argptr, szFormat);
 258     wxVLogSysError(szFormat, argptr);
 259     va_end(argptr);
 260 }
 261
 262 void WXDLLEXPORT wxVLogSysError(long err, const wxString& format, va_list argptr)
 263 {
 264     if ( wxLog::IsEnabled() ) {
 265         wxLog::OnLog(wxLOG_Error,
 266                      wxString::FormatV(format, argptr) + wxLogSysErrorHelper(err),
 267                      time(NULL));
 268     }
 269 }
 270
 271 void WXDLLEXPORT wxDoLogSysError(long lErrCode, const wxChar *szFormat, ...)
 272 {
 273     va_list argptr;
 274     va_start(argptr, szFormat);
 275     wxVLogSysError(lErrCode, szFormat, argptr);
 276     va_end(argptr);
 277 }
 278
 279 // ----------------------------------------------------------------------------
 280 // wxLog class implementation
 281 // ----------------------------------------------------------------------------
 282
 283 /* static */
 284 unsigned wxLog::DoLogNumberOfRepeats()
 285 {
 286     long retval = ms_prevCounter;
 287     wxLog *pLogger = GetActiveTarget();
 288     if ( pLogger && ms_prevCounter > 0 )
 289     {
 290         wxString msg;
 291 #if wxUSE_INTL
 292         msg.Printf(wxPLURAL("The previous message repeated once.",
 293                             "The previous message repeated %lu times.",
 294                             ms_prevCounter),
 295                    ms_prevCounter);
 296 #else
 297         msg.Printf(wxT("The previous message was repeated."));
 298 #endif
 299         ms_prevCounter = 0;
 300         ms_prevString.clear();
 301         pLogger->DoLog(ms_prevLevel, msg.c_str(), ms_prevTimeStamp);
 302     }
 303     return retval;
 304 }
 305
 306 wxLog::~wxLog()
 307 {
 308     if ( ms_prevCounter > 0 )
 309     {
 310         // looks like the repeat count has not been logged yet,
 311         // so let's do it now
 312         wxLog::DoLogNumberOfRepeats();
 313     }
 314 }
 315
 316 /* static */
 317 void wxLog::OnLog(wxLogLevel level, const wxChar *szString, time_t t)
 318 {
 319     if ( IsEnabled() && ms_logLevel >= level )
 320     {
 321         wxLog *pLogger = GetActiveTarget();
 322         if ( pLogger )
 323         {
 324             if ( GetRepetitionCounting() && ms_prevString == szString )
 325             {
 326                 ms_prevCounter++;
 327             }
 328             else
 329             {
 330                 if ( GetRepetitionCounting() )
 331                 {
 332                     DoLogNumberOfRepeats();
 333                 }
 334                 ms_prevString = szString;
 335                 ms_prevLevel = level;
 336                 ms_prevTimeStamp = t;
 337                 pLogger->DoLog(level, szString, t);
 338             }
 339         }
 340     }
 341 }
 342
 343 // deprecated function
 344 #if WXWIN_COMPATIBILITY_2_6
 345
 346 wxChar *wxLog::SetLogBuffer(wxChar * WXUNUSED(buf), size_t WXUNUSED(size))
 347 {
 348     return NULL;
 349 }
 350
 351 #endif // WXWIN_COMPATIBILITY_2_6
 352
 353 wxLog *wxLog::GetActiveTarget()
 354 {
 355     if ( ms_bAutoCreate && ms_pLogger == NULL ) {
 356         // prevent infinite recursion if someone calls wxLogXXX() from
 357         // wxApp::CreateLogTarget()
 358         static bool s_bInGetActiveTarget = false;
 359         if ( !s_bInGetActiveTarget ) {
 360             s_bInGetActiveTarget = true;
 361
 362             // ask the application to create a log target for us
 363             if ( wxTheApp != NULL )
 364                 ms_pLogger = wxTheApp->GetTraits()->CreateLogTarget();
 365             else
 366                 ms_pLogger = new wxLogStderr;
 367
 368             s_bInGetActiveTarget = false;
 369
 370             // do nothing if it fails - what can we do?
 371         }
 372     }
 373
 374     return ms_pLogger;
 375 }
 376
 377 wxLog *wxLog::SetActiveTarget(wxLog *pLogger)
 378 {
 379     if ( ms_pLogger != NULL ) {
 380         // flush the old messages before changing because otherwise they might
 381         // get lost later if this target is not restored
 382         ms_pLogger->Flush();
 383     }
 384
 385     wxLog *pOldLogger = ms_pLogger;
 386     ms_pLogger = pLogger;
 387
 388     return pOldLogger;
 389 }
 390
 391 void wxLog::DontCreateOnDemand()
 392 {
 393     ms_bAutoCreate = false;
 394
 395     // this is usually called at the end of the program and we assume that it
 396     // is *always* called at the end - so we free memory here to avoid false
 397     // memory leak reports from wxWin  memory tracking code
 398     ClearTraceMasks();
 399 }
 400
 401 void wxLog::RemoveTraceMask(const wxString& str)
 402 {
 403     int index = ms_aTraceMasks.Index(str);
 404     if ( index != wxNOT_FOUND )
 405         ms_aTraceMasks.RemoveAt((size_t)index);
 406 }
 407
 408 void wxLog::ClearTraceMasks()
 409 {
 410     ms_aTraceMasks.Clear();
 411 }
 412
 413 void wxLog::TimeStamp(wxString *str)
 414 {
 415 #if wxUSE_DATETIME
 416     if ( ms_timestamp )
 417     {
 418         wxChar buf[256];
 419         time_t timeNow;
 420         (void)time(&timeNow);
 421
 422         struct tm tm;
 423         wxStrftime(buf, WXSIZEOF(buf),
 424                     ms_timestamp, wxLocaltime_r(&timeNow, &tm));
 425
 426         str->Empty();
 427         *str << buf << wxT(": ");
 428     }
 429 #endif // wxUSE_DATETIME
 430 }
 431
 432 void wxLog::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
 433 {
 434     switch ( level ) {
 435         case wxLOG_FatalError:
 436             DoLogString(wxString(_("Fatal error: ")) + szString, t);
 437             DoLogString(_("Program aborted."), t);
 438             Flush();
 439 #ifdef __WXWINCE__
 440             ExitThread(3);
 441 #else
 442             abort();
 443 #endif
 444             break;
 445
 446         case wxLOG_Error:
 447             DoLogString(wxString(_("Error: ")) + szString, t);
 448             break;
 449
 450         case wxLOG_Warning:
 451             DoLogString(wxString(_("Warning: ")) + szString, t);
 452             break;
 453
 454         case wxLOG_Info:
 455             if ( GetVerbose() )
 456         case wxLOG_Message:
 457         case wxLOG_Status:
 458         default:    // log unknown log levels too
 459                 DoLogString(szString, t);
 460             break;
 461
 462         case wxLOG_Trace:
 463         case wxLOG_Debug:
 464 #ifdef __WXDEBUG__
 465             {
 466                 wxString msg = level == wxLOG_Trace ? wxT("Trace: ")
 467                                                     : wxT("Debug: ");
 468                 msg << szString;
 469                 DoLogString(msg, t);
 470             }
 471 #endif // Debug
 472             break;
 473     }
 474 }
 475
 476 void wxLog::DoLogString(const wxChar *WXUNUSED(szString), time_t WXUNUSED(t))
 477 {
 478     wxFAIL_MSG(wxT("DoLogString must be overriden if it's called."));
 479 }
 480
 481 void wxLog::Flush()
 482 {
 483     // nothing to do here
 484 }
 485
 486 /*static*/ bool wxLog::IsAllowedTraceMask(const wxChar *mask)
 487 {
 488     for ( wxArrayString::iterator it = ms_aTraceMasks.begin(),
 489                                   en = ms_aTraceMasks.end();
 490          it != en; ++it )
 491         if ( *it == mask)
 492             return true;
 493     return false;
 494 }
 495
 496 // ----------------------------------------------------------------------------
 497 // wxLogBuffer implementation
 498 // ----------------------------------------------------------------------------
 499
 500 void wxLogBuffer::Flush()
 501 {
 502     if ( !m_str.empty() )
 503     {
 504         wxMessageOutputBest out;
 505         out.Printf(_T("%s"), m_str.c_str());
 506         m_str.clear();
 507     }
 508 }
 509
 510 void wxLogBuffer::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
 511 {
 512     switch ( level )
 513     {
 514         case wxLOG_Trace:
 515         case wxLOG_Debug:
 516 #ifdef __WXDEBUG__
 517             // don't put debug messages in the buffer, we don't want to show
 518             // them to the user in a msg box, log them immediately
 519             {
 520                 wxString str;
 521                 TimeStamp(&str);
 522                 str += szString;
 523
 524                 wxMessageOutputDebug dbgout;
 525                 dbgout.Printf(_T("%s\n"), str.c_str());
 526             }
 527 #endif // __WXDEBUG__
 528             break;
 529
 530         default:
 531             wxLog::DoLog(level, szString, t);
 532     }
 533 }
 534
 535 void wxLogBuffer::DoLogString(const wxChar *szString, time_t WXUNUSED(t))
 536 {
 537     m_str << szString << _T("\n");
 538 }
 539
 540 // ----------------------------------------------------------------------------
 541 // wxLogStderr class implementation
 542 // ----------------------------------------------------------------------------
 543
 544 wxLogStderr::wxLogStderr(FILE *fp)
 545 {
 546     if ( fp == NULL )
 547         m_fp = stderr;
 548     else
 549         m_fp = fp;
 550 }
 551
 552 void wxLogStderr::DoLogString(const wxChar *szString, time_t WXUNUSED(t))
 553 {
 554     wxString str;
 555     TimeStamp(&str);
 556     str << szString;
 557
 558     wxFputs(str, m_fp);
 559     wxFputc(_T('\n'), m_fp);
 560     fflush(m_fp);
 561
 562     // under GUI systems such as Windows or Mac, programs usually don't have
 563     // stderr at all, so show the messages also somewhere else, typically in
 564     // the debugger window so that they go at least somewhere instead of being
 565     // simply lost
 566     if ( m_fp == stderr )
 567     {
 568         wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
 569         if ( traits && !traits->HasStderr() )
 570         {
 571             wxMessageOutputDebug dbgout;
 572             dbgout.Printf(_T("%s\n"), str.c_str());
 573         }
 574     }
 575 }
 576
 577 // ----------------------------------------------------------------------------
 578 // wxLogStream implementation
 579 // ----------------------------------------------------------------------------
 580
 581 #if wxUSE_STD_IOSTREAM
 582 #include "wx/ioswrap.h"
 583 wxLogStream::wxLogStream(wxSTD ostream *ostr)
 584 {
 585     if ( ostr == NULL )
 586         m_ostr = &wxSTD cerr;
 587     else
 588         m_ostr = ostr;
 589 }
 590
 591 void wxLogStream::DoLogString(const wxChar *szString, time_t WXUNUSED(t))
 592 {
 593     wxString str;
 594     TimeStamp(&str);
 595     (*m_ostr) << wxConvertWX2MB(str) << wxConvertWX2MB(szString) << wxSTD endl;
 596 }
 597 #endif // wxUSE_STD_IOSTREAM
 598
 599 // ----------------------------------------------------------------------------
 600 // wxLogChain
 601 // ----------------------------------------------------------------------------
 602
 603 wxLogChain::wxLogChain(wxLog *logger)
 604 {
 605     m_bPassMessages = true;
 606
 607     m_logNew = logger;
 608     m_logOld = wxLog::SetActiveTarget(this);
 609 }
 610
 611 wxLogChain::~wxLogChain()
 612 {
 613     delete m_logOld;
 614
 615     if ( m_logNew != this )
 616         delete m_logNew;
 617 }
 618
 619 void wxLogChain::SetLog(wxLog *logger)
 620 {
 621     if ( m_logNew != this )
 622         delete m_logNew;
 623
 624     m_logNew = logger;
 625 }
 626
 627 void wxLogChain::Flush()
 628 {
 629     if ( m_logOld )
 630         m_logOld->Flush();
 631
 632     // be careful to avoid infinite recursion
 633     if ( m_logNew && m_logNew != this )
 634         m_logNew->Flush();
 635 }
 636
 637 void wxLogChain::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
 638 {
 639     // let the previous logger show it
 640     if ( m_logOld && IsPassingMessages() )
 641     {
 642         // bogus cast just to access protected DoLog
 643         ((wxLogChain *)m_logOld)->DoLog(level, szString, t);
 644     }
 645
 646     if ( m_logNew && m_logNew != this )
 647     {
 648         // as above...
 649         ((wxLogChain *)m_logNew)->DoLog(level, szString, t);
 650     }
 651 }
 652
 653 // ----------------------------------------------------------------------------
 654 // wxLogPassThrough
 655 // ----------------------------------------------------------------------------
 656
 657 #ifdef __VISUALC__
 658     // "'this' : used in base member initializer list" - so what?
 659     #pragma warning(disable:4355)
 660 #endif // VC++
 661
 662 wxLogPassThrough::wxLogPassThrough()
 663                 : wxLogChain(this)
 664 {
 665 }
 666
 667 #ifdef __VISUALC__
 668     #pragma warning(default:4355)
 669 #endif // VC++
 670
 671 // ============================================================================
 672 // Global functions/variables
 673 // ============================================================================
 674
 675 // ----------------------------------------------------------------------------
 676 // static variables
 677 // ----------------------------------------------------------------------------
 678
 679 bool            wxLog::ms_bRepetCounting = false;
 680 wxString        wxLog::ms_prevString;
 681 unsigned int    wxLog::ms_prevCounter = 0;
 682 time_t          wxLog::ms_prevTimeStamp= 0;
 683 wxLogLevel      wxLog::ms_prevLevel;
 684
 685 wxLog          *wxLog::ms_pLogger      = (wxLog *)NULL;
 686 bool            wxLog::ms_doLog        = true;
 687 bool            wxLog::ms_bAutoCreate  = true;
 688 bool            wxLog::ms_bVerbose     = false;
 689
 690 wxLogLevel      wxLog::ms_logLevel     = wxLOG_Max;  // log everything by default
 691
 692 size_t          wxLog::ms_suspendCount = 0;
 693
 694 const wxChar   *wxLog::ms_timestamp    = wxT("%X");  // time only, no date
 695
 696 wxTraceMask     wxLog::ms_ulTraceMask  = (wxTraceMask)0;
 697 wxArrayString   wxLog::ms_aTraceMasks;
 698
 699 // ----------------------------------------------------------------------------
 700 // stdout error logging helper
 701 // ----------------------------------------------------------------------------
 702
 703 // helper function: wraps the message and justifies it under given position
 704 // (looks more pretty on the terminal). Also adds newline at the end.
 705 //
 706 // TODO this is now disabled until I find a portable way of determining the
 707 //      terminal window size (ok, I found it but does anybody really cares?)
 708 #ifdef LOG_PRETTY_WRAP
 709 static void wxLogWrap(FILE *f, const char *pszPrefix, const char *psz)
 710 {
 711     size_t nMax = 80; // FIXME
 712     size_t nStart = strlen(pszPrefix);
 713     fputs(pszPrefix, f);
 714
 715     size_t n;
 716     while ( *psz != '\0' ) {
 717         for ( n = nStart; (n < nMax) && (*psz != '\0'); n++ )
 718             putc(*psz++, f);
 719
 720         // wrapped?
 721         if ( *psz != '\0' ) {
 722             /*putc('\n', f);*/
 723             for ( n = 0; n < nStart; n++ )
 724                 putc(' ', f);
 725
 726             // as we wrapped, squeeze all white space
 727             while ( isspace(*psz) )
 728                 psz++;
 729         }
 730     }
 731
 732     putc('\n', f);
 733 }
 734 #endif  //LOG_PRETTY_WRAP
 735
 736 // ----------------------------------------------------------------------------
 737 // error code/error message retrieval functions
 738 // ----------------------------------------------------------------------------
 739
 740 // get error code from syste
 741 unsigned long wxSysErrorCode()
 742 {
 743 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 744     return ::GetLastError();
 745 #else   //Unix
 746     return errno;
 747 #endif  //Win/Unix
 748 }
 749
 750 // get error message from system
 751 const wxChar *wxSysErrorMsg(unsigned long nErrCode)
 752 {
 753     if ( nErrCode == 0 )
 754         nErrCode = wxSysErrorCode();
 755
 756 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 757     static wxChar s_szBuf[1024];
 758
 759     // get error message from system
 760     LPVOID lpMsgBuf;
 761     if ( ::FormatMessage
 762          (
 763             FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
 764             NULL,
 765             nErrCode,
 766             MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
 767             (LPTSTR)&lpMsgBuf,
 768             0,
 769             NULL
 770          ) == 0 )
 771     {
 772         // if this happens, something is seriously wrong, so don't use _() here
 773         // for safety
 774         wxSprintf(s_szBuf, _T("unknown error %lx"), nErrCode);
 775         return s_szBuf;
 776     }
 777
 778
 779     // copy it to our buffer and free memory
 780     // Crashes on SmartPhone (FIXME)
 781 #if !defined(__SMARTPHONE__) /* of WinCE */
 782     if( lpMsgBuf != 0 )
 783     {
 784         wxStrncpy(s_szBuf, (const wxChar *)lpMsgBuf, WXSIZEOF(s_szBuf) - 1);
 785         s_szBuf[WXSIZEOF(s_szBuf) - 1] = wxT('\0');
 786
 787         LocalFree(lpMsgBuf);
 788
 789         // returned string is capitalized and ended with '\r\n' - bad
 790         s_szBuf[0] = (wxChar)wxTolower(s_szBuf[0]);
 791         size_t len = wxStrlen(s_szBuf);
 792         if ( len > 0 ) {
 793             // truncate string
 794             if ( s_szBuf[len - 2] == wxT('\r') )
 795                 s_szBuf[len - 2] = wxT('\0');
 796         }
 797     }
 798     else
 799 #endif // !__SMARTPHONE__
 800     {
 801         s_szBuf[0] = wxT('\0');
 802     }
 803
 804     return s_szBuf;
 805 #else // !__WXMSW__
 806     #if wxUSE_UNICODE
 807         static wchar_t s_wzBuf[1024];
 808         wxConvCurrent->MB2WC(s_wzBuf, strerror((int)nErrCode),
 809                              WXSIZEOF(s_wzBuf) - 1);
 810         return s_wzBuf;
 811     #else
 812         return strerror((int)nErrCode);
 813     #endif
 814 #endif  // __WXMSW__/!__WXMSW__
 815 }
 816
 817 #endif // wxUSE_LOG