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 wxLog::wxLog()
 371 {
 372 }
 373
 374 wxChar *wxLog::SetLogBuffer( wxChar *buf, size_t size)
 375 {
 376     wxChar *oldbuf = s_szBuf;
 377
 378     if( buf == 0 )
 379     {
 380         s_szBuf = s_szBufStatic;
 381         s_szBufSize = WXSIZEOF( s_szBufStatic );
 382     }
 383     else
 384     {
 385         s_szBuf = buf;
 386         s_szBufSize = size;
 387     }
 388
 389     return (oldbuf == s_szBufStatic ) ? 0 : oldbuf;
 390 }
 391
 392 wxLog *wxLog::GetActiveTarget()
 393 {
 394     if ( ms_bAutoCreate && ms_pLogger == NULL ) {
 395         // prevent infinite recursion if someone calls wxLogXXX() from
 396         // wxApp::CreateLogTarget()
 397         static bool s_bInGetActiveTarget = false;
 398         if ( !s_bInGetActiveTarget ) {
 399             s_bInGetActiveTarget = true;
 400
 401             // ask the application to create a log target for us
 402             if ( wxTheApp != NULL )
 403                 ms_pLogger = wxTheApp->GetTraits()->CreateLogTarget();
 404             else
 405                 ms_pLogger = new wxLogStderr;
 406
 407             s_bInGetActiveTarget = false;
 408
 409             // do nothing if it fails - what can we do?
 410         }
 411     }
 412
 413     return ms_pLogger;
 414 }
 415
 416 wxLog *wxLog::SetActiveTarget(wxLog *pLogger)
 417 {
 418     if ( ms_pLogger != NULL ) {
 419         // flush the old messages before changing because otherwise they might
 420         // get lost later if this target is not restored
 421         ms_pLogger->Flush();
 422     }
 423
 424     wxLog *pOldLogger = ms_pLogger;
 425     ms_pLogger = pLogger;
 426
 427     return pOldLogger;
 428 }
 429
 430 void wxLog::DontCreateOnDemand()
 431 {
 432     ms_bAutoCreate = false;
 433
 434     // this is usually called at the end of the program and we assume that it
 435     // is *always* called at the end - so we free memory here to avoid false
 436     // memory leak reports from wxWin  memory tracking code
 437     ClearTraceMasks();
 438 }
 439
 440 void wxLog::RemoveTraceMask(const wxString& str)
 441 {
 442     int index = ms_aTraceMasks.Index(str);
 443     if ( index != wxNOT_FOUND )
 444         ms_aTraceMasks.RemoveAt((size_t)index);
 445 }
 446
 447 void wxLog::ClearTraceMasks()
 448 {
 449     ms_aTraceMasks.Clear();
 450 }
 451
 452 void wxLog::TimeStamp(wxString *str)
 453 {
 454     if ( ms_timestamp )
 455     {
 456         wxChar buf[256];
 457         time_t timeNow;
 458         (void)time(&timeNow);
 459         wxStrftime(buf, WXSIZEOF(buf), ms_timestamp, localtime(&timeNow));
 460
 461         str->Empty();
 462         *str << buf << wxT(": ");
 463     }
 464 }
 465
 466 void wxLog::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
 467 {
 468     switch ( level ) {
 469         case wxLOG_FatalError:
 470             DoLogString(wxString(_("Fatal error: ")) + szString, t);
 471             DoLogString(_("Program aborted."), t);
 472             Flush();
 473 #ifdef __WXWINCE__
 474             ExitThread(3);
 475 #else
 476             abort();
 477 #endif
 478             break;
 479
 480         case wxLOG_Error:
 481             DoLogString(wxString(_("Error: ")) + szString, t);
 482             break;
 483
 484         case wxLOG_Warning:
 485             DoLogString(wxString(_("Warning: ")) + szString, t);
 486             break;
 487
 488         case wxLOG_Info:
 489             if ( GetVerbose() )
 490         case wxLOG_Message:
 491         case wxLOG_Status:
 492         default:    // log unknown log levels too
 493                 DoLogString(szString, t);
 494             break;
 495
 496         case wxLOG_Trace:
 497         case wxLOG_Debug:
 498 #ifdef __WXDEBUG__
 499             {
 500                 wxString msg = level == wxLOG_Trace ? wxT("Trace: ")
 501                                                     : wxT("Debug: ");
 502                 msg << szString;
 503                 DoLogString(msg, t);
 504             }
 505 #endif // Debug
 506             break;
 507     }
 508 }
 509
 510 void wxLog::DoLogString(const wxChar *WXUNUSED(szString), time_t WXUNUSED(t))
 511 {
 512     wxFAIL_MSG(wxT("DoLogString must be overriden if it's called."));
 513 }
 514
 515 void wxLog::Flush()
 516 {
 517     // nothing to do here
 518 }
 519
 520 /*static*/ bool wxLog::IsAllowedTraceMask(const wxChar *mask)
 521 {
 522     for ( wxArrayString::iterator it = ms_aTraceMasks.begin(),
 523                                   en = ms_aTraceMasks.end();
 524          it != en; ++it )
 525         if ( *it == mask)
 526             return true;
 527     return false;
 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"), 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) << 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 wxLog          *wxLog::ms_pLogger      = (wxLog *)NULL;
 670 bool            wxLog::ms_doLog        = true;
 671 bool            wxLog::ms_bAutoCreate  = true;
 672 bool            wxLog::ms_bVerbose     = false;
 673
 674 wxLogLevel      wxLog::ms_logLevel     = wxLOG_Max;  // log everything by default
 675
 676 size_t          wxLog::ms_suspendCount = 0;
 677
 678 const wxChar   *wxLog::ms_timestamp    = wxT("%X");  // time only, no date
 679
 680 wxTraceMask     wxLog::ms_ulTraceMask  = (wxTraceMask)0;
 681 wxArrayString   wxLog::ms_aTraceMasks;
 682
 683 // ----------------------------------------------------------------------------
 684 // stdout error logging helper
 685 // ----------------------------------------------------------------------------
 686
 687 // helper function: wraps the message and justifies it under given position
 688 // (looks more pretty on the terminal). Also adds newline at the end.
 689 //
 690 // TODO this is now disabled until I find a portable way of determining the
 691 //      terminal window size (ok, I found it but does anybody really cares?)
 692 #ifdef LOG_PRETTY_WRAP
 693 static void wxLogWrap(FILE *f, const char *pszPrefix, const char *psz)
 694 {
 695     size_t nMax = 80; // FIXME
 696     size_t nStart = strlen(pszPrefix);
 697     fputs(pszPrefix, f);
 698
 699     size_t n;
 700     while ( *psz != '\0' ) {
 701         for ( n = nStart; (n < nMax) && (*psz != '\0'); n++ )
 702             putc(*psz++, f);
 703
 704         // wrapped?
 705         if ( *psz != '\0' ) {
 706             /*putc('\n', f);*/
 707             for ( n = 0; n < nStart; n++ )
 708                 putc(' ', f);
 709
 710             // as we wrapped, squeeze all white space
 711             while ( isspace(*psz) )
 712                 psz++;
 713         }
 714     }
 715
 716     putc('\n', f);
 717 }
 718 #endif  //LOG_PRETTY_WRAP
 719
 720 // ----------------------------------------------------------------------------
 721 // error code/error message retrieval functions
 722 // ----------------------------------------------------------------------------
 723
 724 // get error code from syste
 725 unsigned long wxSysErrorCode()
 726 {
 727 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 728     return ::GetLastError();
 729 #else   //Unix
 730     return errno;
 731 #endif  //Win/Unix
 732 }
 733
 734 // get error message from system
 735 const wxChar *wxSysErrorMsg(unsigned long nErrCode)
 736 {
 737     if ( nErrCode == 0 )
 738         nErrCode = wxSysErrorCode();
 739
 740 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 741     static wxChar s_szBuf[LOG_BUFFER_SIZE / 2];
 742
 743     // get error message from system
 744     LPVOID lpMsgBuf;
 745     FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
 746             NULL, nErrCode,
 747             MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
 748             (LPTSTR)&lpMsgBuf,
 749             0, NULL);
 750
 751     // copy it to our buffer and free memory
 752     // Crashes on SmartPhone
 753 #if !defined(__SMARTPHONE__) /* of WinCE */
 754      if( lpMsgBuf != 0 ) {
 755         wxStrncpy(s_szBuf, (const wxChar *)lpMsgBuf, WXSIZEOF(s_szBuf) - 1);
 756         s_szBuf[WXSIZEOF(s_szBuf) - 1] = wxT('\0');
 757
 758         LocalFree(lpMsgBuf);
 759
 760         // returned string is capitalized and ended with '\r\n' - bad
 761         s_szBuf[0] = (wxChar)wxTolower(s_szBuf[0]);
 762         size_t len = wxStrlen(s_szBuf);
 763         if ( len > 0 ) {
 764             // truncate string
 765             if ( s_szBuf[len - 2] == wxT('\r') )
 766                 s_szBuf[len - 2] = wxT('\0');
 767         }
 768     }
 769     else
 770 #endif
 771     {
 772         s_szBuf[0] = wxT('\0');
 773     }
 774
 775     return s_szBuf;
 776 #else   // Unix-WXMICROWIN
 777 #if wxUSE_UNICODE
 778     static wxChar s_szBuf[LOG_BUFFER_SIZE / 2];
 779     wxConvCurrent->MB2WC(s_szBuf, strerror(nErrCode), WXSIZEOF(s_szBuf) -1);
 780     return s_szBuf;
 781 #else
 782     return strerror((int)nErrCode);
 783 #endif
 784 #endif  // Win/Unix-WXMICROWIN
 785 }
 786
 787 #endif // wxUSE_LOG
 788