src/common/log.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        log.cpp
   3 // Purpose:     Assorted wxLogXXX functions, and wxLog (sink for logs)
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     29/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  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 // wxWindows
  32 #ifndef WX_PRECOMP
  33     #include "wx/string.h"
  34     #include "wx/intl.h"
  35     #include "wx/app.h"
  36
  37     #if wxUSE_GUI
  38         #include "wx/window.h"
  39         #ifdef __WXMSW__
  40             #include "wx/msw/private.h"
  41         #endif
  42         #include "wx/msgdlg.h"
  43     #endif
  44 #endif //WX_PRECOMP
  45
  46 #include  "wx/file.h"
  47 #include  "wx/textfile.h"
  48 #include  "wx/utils.h"
  49 #include  "wx/wxchar.h"
  50 #include  "wx/log.h"
  51 #include  "wx/thread.h"
  52
  53 // other standard headers
  54 #include  <errno.h>
  55 #include  <stdlib.h>
  56 #include  <time.h>
  57
  58 #ifdef  __WXMSW__
  59   #include  "wx/msw/private.h"      // includes windows.h for OutputDebugString
  60 #else   //Unix
  61   #include  <signal.h>
  62 #endif  //Win/Unix
  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 // globals
  81 // ----------------------------------------------------------------------------
  82
  83 // log functions can't allocate memory (LogError("out of memory...") should
  84 // work!), so we use a static buffer for all log messages
  85 #define LOG_BUFFER_SIZE   (4096)
  86
  87 // static buffer for error messages
  88 static wxChar s_szBuf[LOG_BUFFER_SIZE];
  89
  90 #if wxUSE_THREADS
  91
  92 // the critical section protecting the static buffer
  93 static wxCriticalSection gs_csLogBuf;
  94
  95 #endif // wxUSE_THREADS
  96
  97 // ----------------------------------------------------------------------------
  98 // implementation of Log functions
  99 //
 100 // NB: unfortunately we need all these distinct functions, we can't make them
 101 //     macros and not all compilers inline vararg functions.
 102 // ----------------------------------------------------------------------------
 103
 104 // generic log function
 105 void wxLogGeneric(wxLogLevel level, const wxChar *szFormat, ...)
 106 {
 107   if ( wxLog::GetActiveTarget() != NULL ) {
 108     wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);
 109
 110     va_list argptr;
 111     va_start(argptr, szFormat);
 112     wxVsnprintf(s_szBuf, WXSIZEOF(s_szBuf), szFormat, argptr);
 113     va_end(argptr);
 114
 115     wxLog::OnLog(level, s_szBuf, time(NULL));
 116   }
 117 }
 118
 119 #define IMPLEMENT_LOG_FUNCTION(level)                             \
 120   void wxLog##level(const wxChar *szFormat, ...)                  \
 121   {                                                               \
 122     if ( wxLog::GetActiveTarget() != NULL ) {                     \
 123       wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);                    \
 124                                                                   \
 125       va_list argptr;                                             \
 126       va_start(argptr, szFormat);                                 \
 127       wxVsnprintf(s_szBuf, WXSIZEOF(s_szBuf), szFormat, argptr);  \
 128       va_end(argptr);                                             \
 129                                                                   \
 130       wxLog::OnLog(wxLOG_##level, s_szBuf, time(NULL));           \
 131     }                                                             \
 132   }
 133
 134 IMPLEMENT_LOG_FUNCTION(FatalError)
 135 IMPLEMENT_LOG_FUNCTION(Error)
 136 IMPLEMENT_LOG_FUNCTION(Warning)
 137 IMPLEMENT_LOG_FUNCTION(Message)
 138 IMPLEMENT_LOG_FUNCTION(Info)
 139 IMPLEMENT_LOG_FUNCTION(Status)
 140
 141 // same as info, but only if 'verbose' mode is on
 142 void wxLogVerbose(const wxChar *szFormat, ...)
 143 {
 144   wxLog *pLog = wxLog::GetActiveTarget();
 145   if ( pLog != NULL && pLog->GetVerbose() ) {
 146     wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);
 147
 148     va_list argptr;
 149     va_start(argptr, szFormat);
 150     wxVsnprintf(s_szBuf, WXSIZEOF(s_szBuf), szFormat, argptr);
 151     va_end(argptr);
 152
 153     wxLog::OnLog(wxLOG_Info, s_szBuf, time(NULL));
 154   }
 155 }
 156
 157 // debug functions
 158 #ifdef __WXDEBUG__
 159 #define IMPLEMENT_LOG_DEBUG_FUNCTION(level)                       \
 160   void wxLog##level(const wxChar *szFormat, ...)                  \
 161   {                                                               \
 162     if ( wxLog::GetActiveTarget() != NULL ) {                     \
 163       wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);                    \
 164                                                                   \
 165       va_list argptr;                                             \
 166       va_start(argptr, szFormat);                                 \
 167       wxVsnprintf(s_szBuf, WXSIZEOF(s_szBuf), szFormat, argptr);  \
 168       va_end(argptr);                                             \
 169                                                                   \
 170       wxLog::OnLog(wxLOG_##level, s_szBuf, time(NULL));           \
 171     }                                                             \
 172   }
 173
 174   void wxLogTrace(const wxChar *mask, const wxChar *szFormat, ...)
 175   {
 176     wxLog *pLog = wxLog::GetActiveTarget();
 177
 178     if ( pLog != NULL && wxLog::IsAllowedTraceMask(mask) ) {
 179       wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);
 180
 181       va_list argptr;
 182       va_start(argptr, szFormat);
 183       wxVsnprintf(s_szBuf, WXSIZEOF(s_szBuf), szFormat, argptr);
 184       va_end(argptr);
 185
 186       wxLog::OnLog(wxLOG_Trace, s_szBuf, time(NULL));
 187     }
 188   }
 189
 190   void wxLogTrace(wxTraceMask mask, const wxChar *szFormat, ...)
 191   {
 192     wxLog *pLog = wxLog::GetActiveTarget();
 193
 194     // we check that all of mask bits are set in the current mask, so
 195     // that wxLogTrace(wxTraceRefCount | wxTraceOle) will only do something
 196     // if both bits are set.
 197     if ( pLog != NULL && ((pLog->GetTraceMask() & mask) == mask) ) {
 198       wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);
 199
 200       va_list argptr;
 201       va_start(argptr, szFormat);
 202       wxVsnprintf(s_szBuf, WXSIZEOF(s_szBuf), szFormat, argptr);
 203       va_end(argptr);
 204
 205       wxLog::OnLog(wxLOG_Trace, s_szBuf, time(NULL));
 206     }
 207   }
 208
 209 #else // release
 210   #define IMPLEMENT_LOG_DEBUG_FUNCTION(level)
 211 #endif
 212
 213 IMPLEMENT_LOG_DEBUG_FUNCTION(Debug)
 214 IMPLEMENT_LOG_DEBUG_FUNCTION(Trace)
 215
 216 // wxLogSysError: one uses the last error code, for other  you must give it
 217 // explicitly
 218
 219 // common part of both wxLogSysError
 220 void wxLogSysErrorHelper(long lErrCode)
 221 {
 222     wxChar szErrMsg[LOG_BUFFER_SIZE / 2];
 223     wxSnprintf(szErrMsg, WXSIZEOF(szErrMsg),
 224                _(" (error %ld: %s)"), lErrCode, wxSysErrorMsg(lErrCode));
 225     wxStrncat(s_szBuf, szErrMsg, WXSIZEOF(s_szBuf) - wxStrlen(s_szBuf));
 226
 227     wxLog::OnLog(wxLOG_Error, s_szBuf, time(NULL));
 228 }
 229
 230 void WXDLLEXPORT wxLogSysError(const wxChar *szFormat, ...)
 231 {
 232     wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);
 233
 234     va_list argptr;
 235     va_start(argptr, szFormat);
 236     wxVsnprintf(s_szBuf, WXSIZEOF(s_szBuf), szFormat, argptr);
 237     va_end(argptr);
 238
 239     wxLogSysErrorHelper(wxSysErrorCode());
 240 }
 241
 242 void WXDLLEXPORT wxLogSysError(long lErrCode, const wxChar *szFormat, ...)
 243 {
 244     wxCRIT_SECT_LOCKER(locker, gs_csLogBuf);
 245
 246     va_list argptr;
 247     va_start(argptr, szFormat);
 248     wxVsnprintf(s_szBuf, WXSIZEOF(s_szBuf), szFormat, argptr);
 249     va_end(argptr);
 250
 251     wxLogSysErrorHelper(lErrCode);
 252 }
 253
 254 // ----------------------------------------------------------------------------
 255 // wxLog class implementation
 256 // ----------------------------------------------------------------------------
 257
 258 wxLog::wxLog()
 259 {
 260     m_bHasMessages = FALSE;
 261
 262     // enable verbose messages by default in the debug builds
 263 #ifdef __WXDEBUG__
 264     m_bVerbose = TRUE;
 265 #else // release
 266     m_bVerbose = FALSE;
 267 #endif // debug/release
 268 }
 269
 270 wxLog *wxLog::GetActiveTarget()
 271 {
 272     if ( ms_bAutoCreate && ms_pLogger == NULL ) {
 273         // prevent infinite recursion if someone calls wxLogXXX() from
 274         // wxApp::CreateLogTarget()
 275         static bool s_bInGetActiveTarget = FALSE;
 276         if ( !s_bInGetActiveTarget ) {
 277             s_bInGetActiveTarget = TRUE;
 278
 279             // ask the application to create a log target for us
 280             if ( wxTheApp != NULL )
 281                 ms_pLogger = wxTheApp->CreateLogTarget();
 282             else
 283                 ms_pLogger = new wxLogStderr;
 284
 285             s_bInGetActiveTarget = FALSE;
 286
 287             // do nothing if it fails - what can we do?
 288         }
 289     }
 290
 291     return ms_pLogger;
 292 }
 293
 294 wxLog *wxLog::SetActiveTarget(wxLog *pLogger)
 295 {
 296     if ( ms_pLogger != NULL ) {
 297         // flush the old messages before changing because otherwise they might
 298         // get lost later if this target is not restored
 299         ms_pLogger->Flush();
 300     }
 301
 302     wxLog *pOldLogger = ms_pLogger;
 303     ms_pLogger = pLogger;
 304
 305     return pOldLogger;
 306 }
 307
 308 void wxLog::RemoveTraceMask(const wxString& str)
 309 {
 310     int index = ms_aTraceMasks.Index(str);
 311     if ( index != wxNOT_FOUND )
 312         ms_aTraceMasks.Remove((size_t)index);
 313 }
 314
 315 void wxLog::TimeStamp(wxString *str)
 316 {
 317     if ( ms_timestamp )
 318     {
 319         wxChar buf[256];
 320         time_t timeNow;
 321         (void)time(&timeNow);
 322         wxStrftime(buf, WXSIZEOF(buf), ms_timestamp, localtime(&timeNow));
 323
 324         str->Empty();
 325         *str << buf << wxT(": ");
 326     }
 327 }
 328
 329 void wxLog::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
 330 {
 331     switch ( level ) {
 332         case wxLOG_FatalError:
 333             DoLogString(wxString(_("Fatal error: ")) + szString, t);
 334             DoLogString(_("Program aborted."), t);
 335             Flush();
 336             abort();
 337             break;
 338
 339         case wxLOG_Error:
 340             DoLogString(wxString(_("Error: ")) + szString, t);
 341             break;
 342
 343         case wxLOG_Warning:
 344             DoLogString(wxString(_("Warning: ")) + szString, t);
 345             break;
 346
 347         case wxLOG_Info:
 348             if ( GetVerbose() )
 349         case wxLOG_Message:
 350         case wxLOG_Status:
 351         default:    // log unknown log levels too
 352                 DoLogString(szString, t);
 353             break;
 354
 355         case wxLOG_Trace:
 356         case wxLOG_Debug:
 357 #ifdef __WXDEBUG__
 358             DoLogString(szString, t);
 359 #endif
 360             break;
 361     }
 362 }
 363
 364 void wxLog::DoLogString(const wxChar *WXUNUSED(szString), time_t WXUNUSED(t))
 365 {
 366     wxFAIL_MSG(wxT("DoLogString must be overriden if it's called."));
 367 }
 368
 369 void wxLog::Flush()
 370 {
 371     // do nothing
 372 }
 373
 374 // ----------------------------------------------------------------------------
 375 // wxLogStderr class implementation
 376 // ----------------------------------------------------------------------------
 377
 378 wxLogStderr::wxLogStderr(FILE *fp)
 379 {
 380     if ( fp == NULL )
 381         m_fp = stderr;
 382     else
 383         m_fp = fp;
 384 }
 385
 386 void wxLogStderr::DoLogString(const wxChar *szString, time_t WXUNUSED(t))
 387 {
 388     wxString str;
 389     TimeStamp(&str);
 390     str << szString;
 391
 392     fputs(str.mb_str(), m_fp);
 393     fputc(_T('\n'), m_fp);
 394     fflush(m_fp);
 395
 396     // under Windows, programs usually don't have stderr at all, so show the
 397     // messages also under debugger - unless it's a console program
 398 #if defined(__WXMSW__) && wxUSE_GUI
 399     OutputDebugString(str + wxT("\r\n"));
 400 #endif // MSW
 401 }
 402
 403 // ----------------------------------------------------------------------------
 404 // wxLogStream implementation
 405 // ----------------------------------------------------------------------------
 406
 407 #if wxUSE_STD_IOSTREAM
 408 wxLogStream::wxLogStream(ostream *ostr)
 409 {
 410     if ( ostr == NULL )
 411         m_ostr = &cerr;
 412     else
 413         m_ostr = ostr;
 414 }
 415
 416 void wxLogStream::DoLogString(const wxChar *szString, time_t WXUNUSED(t))
 417 {
 418     (*m_ostr) << wxConvertWX2MB(szString) << endl;
 419 }
 420 #endif // wxUSE_STD_IOSTREAM
 421
 422 // ============================================================================
 423 // Global functions/variables
 424 // ============================================================================
 425
 426 // ----------------------------------------------------------------------------
 427 // static variables
 428 // ----------------------------------------------------------------------------
 429
 430 wxLog          *wxLog::ms_pLogger      = (wxLog *)NULL;
 431 bool            wxLog::ms_doLog        = TRUE;
 432 bool            wxLog::ms_bAutoCreate  = TRUE;
 433
 434 const wxChar   *wxLog::ms_timestamp    = wxT("%X");  // time only, no date
 435
 436 wxTraceMask     wxLog::ms_ulTraceMask  = (wxTraceMask)0;
 437 wxArrayString   wxLog::ms_aTraceMasks;
 438
 439 // ----------------------------------------------------------------------------
 440 // stdout error logging helper
 441 // ----------------------------------------------------------------------------
 442
 443 // helper function: wraps the message and justifies it under given position
 444 // (looks more pretty on the terminal). Also adds newline at the end.
 445 //
 446 // TODO this is now disabled until I find a portable way of determining the
 447 //      terminal window size (ok, I found it but does anybody really cares?)
 448 #ifdef LOG_PRETTY_WRAP
 449 static void wxLogWrap(FILE *f, const char *pszPrefix, const char *psz)
 450 {
 451     size_t nMax = 80; // FIXME
 452     size_t nStart = strlen(pszPrefix);
 453     fputs(pszPrefix, f);
 454
 455     size_t n;
 456     while ( *psz != '\0' ) {
 457         for ( n = nStart; (n < nMax) && (*psz != '\0'); n++ )
 458             putc(*psz++, f);
 459
 460         // wrapped?
 461         if ( *psz != '\0' ) {
 462             /*putc('\n', f);*/
 463             for ( n = 0; n < nStart; n++ )
 464                 putc(' ', f);
 465
 466             // as we wrapped, squeeze all white space
 467             while ( isspace(*psz) )
 468                 psz++;
 469         }
 470     }
 471
 472     putc('\n', f);
 473 }
 474 #endif  //LOG_PRETTY_WRAP
 475
 476 // ----------------------------------------------------------------------------
 477 // error code/error message retrieval functions
 478 // ----------------------------------------------------------------------------
 479
 480 // get error code from syste
 481 unsigned long wxSysErrorCode()
 482 {
 483 #ifdef  __WXMSW__
 484 #ifdef  __WIN32__
 485     return ::GetLastError();
 486 #else   //WIN16
 487     // TODO what to do on Windows 3.1?
 488     return 0;
 489 #endif  //WIN16/32
 490 #else   //Unix
 491     return errno;
 492 #endif  //Win/Unix
 493 }
 494
 495 // get error message from system
 496 const wxChar *wxSysErrorMsg(unsigned long nErrCode)
 497 {
 498     if ( nErrCode == 0 )
 499         nErrCode = wxSysErrorCode();
 500
 501 #ifdef  __WXMSW__
 502 #ifdef  __WIN32__
 503     static wxChar s_szBuf[LOG_BUFFER_SIZE / 2];
 504
 505     // get error message from system
 506     LPVOID lpMsgBuf;
 507     FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
 508             NULL, nErrCode,
 509             MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
 510             (LPTSTR)&lpMsgBuf,
 511             0, NULL);
 512
 513     // copy it to our buffer and free memory
 514     wxStrncpy(s_szBuf, (const wxChar *)lpMsgBuf, WXSIZEOF(s_szBuf) - 1);
 515     s_szBuf[WXSIZEOF(s_szBuf) - 1] = wxT('\0');
 516     LocalFree(lpMsgBuf);
 517
 518     // returned string is capitalized and ended with '\r\n' - bad
 519     s_szBuf[0] = (wxChar)wxTolower(s_szBuf[0]);
 520     size_t len = wxStrlen(s_szBuf);
 521     if ( len > 0 ) {
 522         // truncate string
 523         if ( s_szBuf[len - 2] == wxT('\r') )
 524             s_szBuf[len - 2] = wxT('\0');
 525     }
 526
 527     return s_szBuf;
 528 #else   //Win16
 529     // TODO
 530     return NULL;
 531 #endif // Win16/32
 532 #else   // Unix
 533 #if wxUSE_UNICODE
 534     static wxChar s_szBuf[LOG_BUFFER_SIZE / 2];
 535     wxConvCurrent->MB2WC(s_szBuf, strerror(nErrCode), WXSIZEOF(s_szBuf) -1);
 536     return s_szBuf;
 537 #else
 538     return strerror(nErrCode);
 539 #endif
 540 #endif  // Win/Unix
 541 }
 542
 543 // ----------------------------------------------------------------------------
 544 // debug helper
 545 // ----------------------------------------------------------------------------
 546
 547 #ifdef  __WXDEBUG__
 548
 549 // break into the debugger
 550 void Trap()
 551 {
 552 #ifdef __WXMSW__
 553     DebugBreak();
 554 #elif defined(__WXMAC__)
 555 #if __powerc
 556     Debugger();
 557 #else
 558     SysBreak();
 559 #endif
 560 #elif defined(__UNIX__)
 561     raise(SIGTRAP);
 562 #else
 563     // TODO
 564 #endif // Win/Unix
 565 }
 566
 567 // this function is called when an assert fails
 568 void wxOnAssert(const wxChar *szFile, int nLine, const wxChar *szMsg)
 569 {
 570     // this variable can be set to true to suppress "assert failure" messages
 571     static bool s_bNoAsserts = FALSE;
 572     static bool s_bInAssert = FALSE;        // FIXME MT-unsafe
 573
 574     if ( s_bInAssert ) {
 575         // He-e-e-e-elp!! we're trapped in endless loop
 576         Trap();
 577
 578         s_bInAssert = FALSE;
 579
 580         return;
 581     }
 582
 583     s_bInAssert = TRUE;
 584
 585     wxChar szBuf[LOG_BUFFER_SIZE];
 586
 587     // make life easier for people using VC++ IDE: clicking on the message
 588     // will take us immediately to the place of the failed assert
 589     wxSnprintf(szBuf, WXSIZEOF(szBuf),
 590 #ifdef __VISUALC__
 591                wxT("%s(%d): assert failed"),
 592 #else  // !VC++
 593     // make the error message more clear for all the others
 594                wxT("Assert failed in file %s at line %d"),
 595 #endif // VC/!VC
 596                szFile, nLine);
 597
 598     if ( szMsg != NULL ) {
 599         wxStrcat(szBuf, wxT(": "));
 600         wxStrcat(szBuf, szMsg);
 601     }
 602     else {
 603         wxStrcat(szBuf, wxT("."));
 604     }
 605
 606     if ( !s_bNoAsserts ) {
 607         // send it to the normal log destination
 608         wxLogDebug(szBuf);
 609
 610 #if wxUSE_GUI || defined(__WXMSW__)
 611         // this message is intentionally not translated - it is for
 612         // developpers only
 613         wxStrcat(szBuf, wxT("\nDo you want to stop the program?"
 614                             "\nYou can also choose [Cancel] to suppress "
 615                             "further warnings."));
 616
 617 #if wxUSE_GUI
 618         switch ( wxMessageBox(szBuf, "Debug",
 619                               wxYES_NO | wxCANCEL | wxICON_STOP ) ) {
 620             case wxYES:
 621                 Trap();
 622                 break;
 623
 624             case wxCANCEL:
 625                 s_bNoAsserts = TRUE;
 626                 break;
 627
 628             //case wxNO: nothing to do
 629         }
 630 #else // !GUI, but MSW
 631         switch ( ::MessageBox(NULL, szBuf, "Debug",
 632                               MB_YESNOCANCEL | MB_ICONSTOP ) ) {
 633             case IDYES:
 634                 Trap();
 635                 break;
 636
 637             case IDCANCEL:
 638                 s_bNoAsserts = TRUE;
 639                 break;
 640
 641             //case IDNO: nothing to do
 642         }
 643 #endif // GUI or MSW
 644
 645 #else // !GUI
 646         Trap();
 647 #endif // GUI/!GUI
 648     }
 649
 650     s_bInAssert = FALSE;
 651 }
 652
 653 #endif  //WXDEBUG
 654