util.cpp

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Distributed under the MIT/X11 software license, see the accompanying
   3 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include "headers.h"
   6
   7
   8 map<string, string> mapArgs;
   9 map<string, vector<string> > mapMultiArgs;
  10 bool fDebug = false;
  11 bool fPrintToConsole = false;
  12 bool fPrintToDebugger = false;
  13 char pszSetDataDir[MAX_PATH] = "";
  14 bool fRequestShutdown = false;
  15 bool fShutdown = false;
  16 bool fDaemon = false;
  17 bool fCommandLine = false;
  18 string strMiscWarning;
  19 bool fTestNet = false;
  20 bool fNoListen = false;
  21
  22
  23
  24
  25 // Workaround for "multiple definition of `_tls_used'"
  26 // http://svn.boost.org/trac/boost/ticket/4258
  27 extern "C" void tss_cleanup_implemented() { }
  28
  29
  30
  31
  32
  33 // Init openssl library multithreading support
  34 static boost::interprocess::interprocess_mutex** ppmutexOpenSSL;
  35 void locking_callback(int mode, int i, const char* file, int line)
  36 {
  37     if (mode & CRYPTO_LOCK)
  38         ppmutexOpenSSL[i]->lock();
  39     else
  40         ppmutexOpenSSL[i]->unlock();
  41 }
  42
  43 // Init
  44 class CInit
  45 {
  46 public:
  47     CInit()
  48     {
  49         // Init openssl library multithreading support
  50         ppmutexOpenSSL = (boost::interprocess::interprocess_mutex**)OPENSSL_malloc(CRYPTO_num_locks() * sizeof(boost::interprocess::interprocess_mutex*));
  51         for (int i = 0; i < CRYPTO_num_locks(); i++)
  52             ppmutexOpenSSL[i] = new boost::interprocess::interprocess_mutex();
  53         CRYPTO_set_locking_callback(locking_callback);
  54
  55 #ifdef __WXMSW__
  56         // Seed random number generator with screen scrape and other hardware sources
  57         RAND_screen();
  58 #endif
  59
  60         // Seed random number generator with performance counter
  61         RandAddSeed();
  62     }
  63     ~CInit()
  64     {
  65         // Shutdown openssl library multithreading support
  66         CRYPTO_set_locking_callback(NULL);
  67         for (int i = 0; i < CRYPTO_num_locks(); i++)
  68             delete ppmutexOpenSSL[i];
  69         OPENSSL_free(ppmutexOpenSSL);
  70     }
  71 }
  72 instance_of_cinit;
  73
  74
  75
  76
  77
  78
  79
  80
  81 void RandAddSeed()
  82 {
  83     // Seed with CPU performance counter
  84     int64 nCounter = GetPerformanceCounter();
  85     RAND_add(&nCounter, sizeof(nCounter), 1.5);
  86     memset(&nCounter, 0, sizeof(nCounter));
  87 }
  88
  89 void RandAddSeedPerfmon()
  90 {
  91     RandAddSeed();
  92
  93     // This can take up to 2 seconds, so only do it every 10 minutes
  94     static int64 nLastPerfmon;
  95     if (GetTime() < nLastPerfmon + 10 * 60)
  96         return;
  97     nLastPerfmon = GetTime();
  98
  99 #ifdef __WXMSW__
 100     // Don't need this on Linux, OpenSSL automatically uses /dev/urandom
 101     // Seed with the entire set of perfmon data
 102     unsigned char pdata[250000];
 103     memset(pdata, 0, sizeof(pdata));
 104     unsigned long nSize = sizeof(pdata);
 105     long ret = RegQueryValueExA(HKEY_PERFORMANCE_DATA, "Global", NULL, NULL, pdata, &nSize);
 106     RegCloseKey(HKEY_PERFORMANCE_DATA);
 107     if (ret == ERROR_SUCCESS)
 108     {
 109         RAND_add(pdata, nSize, nSize/100.0);
 110         memset(pdata, 0, nSize);
 111         printf("%s RandAddSeed() %d bytes\n", DateTimeStrFormat("%x %H:%M", GetTime()).c_str(), nSize);
 112     }
 113 #endif
 114 }
 115
 116 uint64 GetRand(uint64 nMax)
 117 {
 118     if (nMax == 0)
 119         return 0;
 120
 121     // The range of the random source must be a multiple of the modulus
 122     // to give every possible output value an equal possibility
 123     uint64 nRange = (UINT64_MAX / nMax) * nMax;
 124     uint64 nRand = 0;
 125     do
 126         RAND_bytes((unsigned char*)&nRand, sizeof(nRand));
 127     while (nRand >= nRange);
 128     return (nRand % nMax);
 129 }
 130
 131 int GetRandInt(int nMax)
 132 {
 133     return GetRand(nMax);
 134 }
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146 inline int OutputDebugStringF(const char* pszFormat, ...)
 147 {
 148     int ret = 0;
 149     if (fPrintToConsole)
 150     {
 151         // print to console
 152         va_list arg_ptr;
 153         va_start(arg_ptr, pszFormat);
 154         ret = vprintf(pszFormat, arg_ptr);
 155         va_end(arg_ptr);
 156     }
 157     else
 158     {
 159         // print to debug.log
 160         static FILE* fileout = NULL;
 161
 162         if (!fileout)
 163         {
 164             char pszFile[MAX_PATH+100];
 165             GetDataDir(pszFile);
 166             strlcat(pszFile, "/debug.log", sizeof(pszFile));
 167             fileout = fopen(pszFile, "a");
 168             if (fileout) setbuf(fileout, NULL); // unbuffered
 169         }
 170         if (fileout)
 171         {
 172             //// Debug print useful for profiling
 173             //fprintf(fileout, " %"PRI64d" ", GetTimeMillis());
 174             va_list arg_ptr;
 175             va_start(arg_ptr, pszFormat);
 176             ret = vfprintf(fileout, pszFormat, arg_ptr);
 177             va_end(arg_ptr);
 178         }
 179     }
 180
 181 #ifdef __WXMSW__
 182     if (fPrintToDebugger)
 183     {
 184         static CCriticalSection cs_OutputDebugStringF;
 185
 186         // accumulate a line at a time
 187         CRITICAL_BLOCK(cs_OutputDebugStringF)
 188         {
 189             static char pszBuffer[50000];
 190             static char* pend;
 191             if (pend == NULL)
 192                 pend = pszBuffer;
 193             va_list arg_ptr;
 194             va_start(arg_ptr, pszFormat);
 195             int limit = END(pszBuffer) - pend - 2;
 196             int ret = _vsnprintf(pend, limit, pszFormat, arg_ptr);
 197             va_end(arg_ptr);
 198             if (ret < 0 || ret >= limit)
 199             {
 200                 pend = END(pszBuffer) - 2;
 201                 *pend++ = '\n';
 202             }
 203             else
 204                 pend += ret;
 205             *pend = '\0';
 206             char* p1 = pszBuffer;
 207             char* p2;
 208             while (p2 = strchr(p1, '\n'))
 209             {
 210                 p2++;
 211                 char c = *p2;
 212                 *p2 = '\0';
 213                 OutputDebugStringA(p1);
 214                 *p2 = c;
 215                 p1 = p2;
 216             }
 217             if (p1 != pszBuffer)
 218                 memmove(pszBuffer, p1, pend - p1 + 1);
 219             pend -= (p1 - pszBuffer);
 220         }
 221     }
 222 #endif
 223     return ret;
 224 }
 225
 226
 227 // Safer snprintf
 228 //  - prints up to limit-1 characters
 229 //  - output string is always null terminated even if limit reached
 230 //  - return value is the number of characters actually printed
 231 int my_snprintf(char* buffer, size_t limit, const char* format, ...)
 232 {
 233     if (limit == 0)
 234         return 0;
 235     va_list arg_ptr;
 236     va_start(arg_ptr, format);
 237     int ret = _vsnprintf(buffer, limit, format, arg_ptr);
 238     va_end(arg_ptr);
 239     if (ret < 0 || ret >= limit)
 240     {
 241         ret = limit - 1;
 242         buffer[limit-1] = 0;
 243     }
 244     return ret;
 245 }
 246
 247
 248 string strprintf(const char* format, ...)
 249 {
 250     char buffer[50000];
 251     char* p = buffer;
 252     int limit = sizeof(buffer);
 253     int ret;
 254     loop
 255     {
 256         va_list arg_ptr;
 257         va_start(arg_ptr, format);
 258         ret = _vsnprintf(p, limit, format, arg_ptr);
 259         va_end(arg_ptr);
 260         if (ret >= 0 && ret < limit)
 261             break;
 262         if (p != buffer)
 263             delete p;
 264         limit *= 2;
 265         p = new char[limit];
 266         if (p == NULL)
 267             throw std::bad_alloc();
 268     }
 269     string str(p, p+ret);
 270     if (p != buffer)
 271         delete p;
 272     return str;
 273 }
 274
 275
 276 bool error(const char* format, ...)
 277 {
 278     char buffer[50000];
 279     int limit = sizeof(buffer);
 280     va_list arg_ptr;
 281     va_start(arg_ptr, format);
 282     int ret = _vsnprintf(buffer, limit, format, arg_ptr);
 283     va_end(arg_ptr);
 284     if (ret < 0 || ret >= limit)
 285     {
 286         ret = limit - 1;
 287         buffer[limit-1] = 0;
 288     }
 289     printf("ERROR: %s\n", buffer);
 290     return false;
 291 }
 292
 293
 294 void ParseString(const string& str, char c, vector<string>& v)
 295 {
 296     if (str.empty())
 297         return;
 298     string::size_type i1 = 0;
 299     string::size_type i2;
 300     loop
 301     {
 302         i2 = str.find(c, i1);
 303         if (i2 == str.npos)
 304         {
 305             v.push_back(str.substr(i1));
 306             return;
 307         }
 308         v.push_back(str.substr(i1, i2-i1));
 309         i1 = i2+1;
 310     }
 311 }
 312
 313
 314 string FormatMoney(int64 n, bool fPlus)
 315 {
 316     n /= CENT;
 317     string str = strprintf("%"PRI64d".%02"PRI64d, (n > 0 ? n : -n)/100, (n > 0 ? n : -n)%100);
 318     for (int i = 6; i < str.size(); i += 4)
 319         if (isdigit(str[str.size() - i - 1]))
 320             str.insert(str.size() - i, 1, ',');
 321     if (n < 0)
 322         str.insert((unsigned int)0, 1, '-');
 323     else if (fPlus && n > 0)
 324         str.insert((unsigned int)0, 1, '+');
 325     return str;
 326 }
 327
 328
 329 bool ParseMoney(const string& str, int64& nRet)
 330 {
 331     return ParseMoney(str.c_str(), nRet);
 332 }
 333
 334 bool ParseMoney(const char* pszIn, int64& nRet)
 335 {
 336     string strWhole;
 337     int64 nCents = 0;
 338     const char* p = pszIn;
 339     while (isspace(*p))
 340         p++;
 341     for (; *p; p++)
 342     {
 343         if (*p == ',' && p > pszIn && isdigit(p[-1]) && isdigit(p[1]) && isdigit(p[2]) && isdigit(p[3]) && !isdigit(p[4]))
 344             continue;
 345         if (*p == '.')
 346         {
 347             p++;
 348             if (isdigit(*p))
 349             {
 350                 nCents = 10 * (*p++ - '0');
 351                 if (isdigit(*p))
 352                     nCents += (*p++ - '0');
 353             }
 354             break;
 355         }
 356         if (isspace(*p))
 357             break;
 358         if (!isdigit(*p))
 359             return false;
 360         strWhole.insert(strWhole.end(), *p);
 361     }
 362     for (; *p; p++)
 363         if (!isspace(*p))
 364             return false;
 365     if (strWhole.size() > 14)
 366         return false;
 367     if (nCents < 0 || nCents > 99)
 368         return false;
 369     int64 nWhole = atoi64(strWhole);
 370     int64 nPreValue = nWhole * 100 + nCents;
 371     int64 nValue = nPreValue * CENT;
 372     if (nValue / CENT != nPreValue)
 373         return false;
 374     if (nValue / COIN != nWhole)
 375         return false;
 376     nRet = nValue;
 377     return true;
 378 }
 379
 380
 381 vector<unsigned char> ParseHex(const char* psz)
 382 {
 383     static char phexdigit[256] =
 384     { -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 385       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 386       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 387       0,1,2,3,4,5,6,7,8,9,-1,-1,-1,-1,-1,-1,
 388       -1,0xa,0xb,0xc,0xd,0xe,0xf,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 389       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 390       -1,0xa,0xb,0xc,0xd,0xe,0xf,-1,-1,-1,-1,-1,-1,-1,-1,-1
 391       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 392       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 393       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 394       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 395       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 396       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 397       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 398       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 399       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, };
 400
 401     // convert hex dump to vector
 402     vector<unsigned char> vch;
 403     loop
 404     {
 405         while (isspace(*psz))
 406             psz++;
 407         char c = phexdigit[(unsigned char)*psz++];
 408         if (c == (char)-1)
 409             break;
 410         unsigned char n = (c << 4);
 411         c = phexdigit[(unsigned char)*psz++];
 412         if (c == (char)-1)
 413             break;
 414         n |= c;
 415         vch.push_back(n);
 416     }
 417     return vch;
 418 }
 419
 420 vector<unsigned char> ParseHex(const string& str)
 421 {
 422     return ParseHex(str.c_str());
 423 }
 424
 425
 426 void ParseParameters(int argc, char* argv[])
 427 {
 428     mapArgs.clear();
 429     mapMultiArgs.clear();
 430     for (int i = 1; i < argc; i++)
 431     {
 432         char psz[10000];
 433         strlcpy(psz, argv[i], sizeof(psz));
 434         char* pszValue = (char*)"";
 435         if (strchr(psz, '='))
 436         {
 437             pszValue = strchr(psz, '=');
 438             *pszValue++ = '\0';
 439         }
 440         #ifdef __WXMSW__
 441         _strlwr(psz);
 442         if (psz[0] == '/')
 443             psz[0] = '-';
 444         #endif
 445         if (psz[0] != '-')
 446             break;
 447         mapArgs[psz] = pszValue;
 448         mapMultiArgs[psz].push_back(pszValue);
 449     }
 450 }
 451
 452
 453 const char* wxGetTranslation(const char* pszEnglish)
 454 {
 455 #ifdef GUI
 456     // Wrapper of wxGetTranslation returning the same const char* type as was passed in
 457     static CCriticalSection cs;
 458     CRITICAL_BLOCK(cs)
 459     {
 460         // Look in cache
 461         static map<string, char*> mapCache;
 462         map<string, char*>::iterator mi = mapCache.find(pszEnglish);
 463         if (mi != mapCache.end())
 464             return (*mi).second;
 465
 466         // wxWidgets translation
 467         wxString strTranslated = wxGetTranslation(wxString(pszEnglish, wxConvUTF8));
 468
 469         // We don't cache unknown strings because caller might be passing in a
 470         // dynamic string and we would keep allocating memory for each variation.
 471         if (strcmp(pszEnglish, strTranslated.utf8_str()) == 0)
 472             return pszEnglish;
 473
 474         // Add to cache, memory doesn't need to be freed.  We only cache because
 475         // we must pass back a pointer to permanently allocated memory.
 476         char* pszCached = new char[strlen(strTranslated.utf8_str())+1];
 477         strcpy(pszCached, strTranslated.utf8_str());
 478         mapCache[pszEnglish] = pszCached;
 479         return pszCached;
 480     }
 481     return NULL;
 482 #else
 483     return pszEnglish;
 484 #endif
 485 }
 486
 487
 488 bool WildcardMatch(const char* psz, const char* mask)
 489 {
 490     loop
 491     {
 492         switch (*mask)
 493         {
 494         case '\0':
 495             return (*psz == '\0');
 496         case '*':
 497             return WildcardMatch(psz, mask+1) || (*psz && WildcardMatch(psz+1, mask));
 498         case '?':
 499             if (*psz == '\0')
 500                 return false;
 501             break;
 502         default:
 503             if (*psz != *mask)
 504                 return false;
 505             break;
 506         }
 507         psz++;
 508         mask++;
 509     }
 510 }
 511
 512 bool WildcardMatch(const string& str, const string& mask)
 513 {
 514     return WildcardMatch(str.c_str(), mask.c_str());
 515 }
 516
 517
 518
 519
 520
 521
 522
 523
 524 void FormatException(char* pszMessage, std::exception* pex, const char* pszThread)
 525 {
 526 #ifdef __WXMSW__
 527     char pszModule[MAX_PATH];
 528     pszModule[0] = '\0';
 529     GetModuleFileNameA(NULL, pszModule, sizeof(pszModule));
 530 #else
 531     const char* pszModule = "bitcoin";
 532 #endif
 533     if (pex)
 534         snprintf(pszMessage, 1000,
 535             "EXCEPTION: %s       \n%s       \n%s in %s       \n", typeid(*pex).name(), pex->what(), pszModule, pszThread);
 536     else
 537         snprintf(pszMessage, 1000,
 538             "UNKNOWN EXCEPTION       \n%s in %s       \n", pszModule, pszThread);
 539 }
 540
 541 void LogException(std::exception* pex, const char* pszThread)
 542 {
 543     char pszMessage[10000];
 544     FormatException(pszMessage, pex, pszThread);
 545     printf("\n%s", pszMessage);
 546 }
 547
 548 void PrintException(std::exception* pex, const char* pszThread)
 549 {
 550     char pszMessage[10000];
 551     FormatException(pszMessage, pex, pszThread);
 552     printf("\n\n************************\n%s\n", pszMessage);
 553     fprintf(stderr, "\n\n************************\n%s\n", pszMessage);
 554     strMiscWarning = pszMessage;
 555 #ifdef GUI
 556     if (wxTheApp && !fDaemon)
 557         MyMessageBox(pszMessage, "Bitcoin", wxOK | wxICON_ERROR);
 558 #endif
 559     throw;
 560 }
 561
 562 void ThreadOneMessageBox(string strMessage)
 563 {
 564     // Skip message boxes if one is already open
 565     static bool fMessageBoxOpen;
 566     if (fMessageBoxOpen)
 567         return;
 568     fMessageBoxOpen = true;
 569     ThreadSafeMessageBox(strMessage, "Bitcoin", wxOK | wxICON_EXCLAMATION);
 570     fMessageBoxOpen = false;
 571 }
 572
 573 void PrintExceptionContinue(std::exception* pex, const char* pszThread)
 574 {
 575     char pszMessage[10000];
 576     FormatException(pszMessage, pex, pszThread);
 577     printf("\n\n************************\n%s\n", pszMessage);
 578     fprintf(stderr, "\n\n************************\n%s\n", pszMessage);
 579     strMiscWarning = pszMessage;
 580 #ifdef GUI
 581     if (wxTheApp && !fDaemon)
 582         boost::thread(boost::bind(ThreadOneMessageBox, string(pszMessage)));
 583 #endif
 584 }
 585
 586
 587
 588
 589
 590
 591
 592
 593 #ifdef __WXMSW__
 594 typedef WINSHELLAPI BOOL (WINAPI *PSHGETSPECIALFOLDERPATHA)(HWND hwndOwner, LPSTR lpszPath, int nFolder, BOOL fCreate);
 595
 596 string MyGetSpecialFolderPath(int nFolder, bool fCreate)
 597 {
 598     char pszPath[MAX_PATH+100] = "";
 599
 600     // SHGetSpecialFolderPath isn't always available on old Windows versions
 601     HMODULE hShell32 = LoadLibraryA("shell32.dll");
 602     if (hShell32)
 603     {
 604         PSHGETSPECIALFOLDERPATHA pSHGetSpecialFolderPath =
 605             (PSHGETSPECIALFOLDERPATHA)GetProcAddress(hShell32, "SHGetSpecialFolderPathA");
 606         if (pSHGetSpecialFolderPath)
 607             (*pSHGetSpecialFolderPath)(NULL, pszPath, nFolder, fCreate);
 608         FreeModule(hShell32);
 609     }
 610
 611     // Backup option
 612     if (pszPath[0] == '\0')
 613     {
 614         if (nFolder == CSIDL_STARTUP)
 615         {
 616             strcpy(pszPath, getenv("USERPROFILE"));
 617             strcat(pszPath, "\\Start Menu\\Programs\\Startup");
 618         }
 619         else if (nFolder == CSIDL_APPDATA)
 620         {
 621             strcpy(pszPath, getenv("APPDATA"));
 622         }
 623     }
 624
 625     return pszPath;
 626 }
 627 #endif
 628
 629 string GetDefaultDataDir()
 630 {
 631     // Windows: C:\Documents and Settings\username\Application Data\Bitcoin
 632     // Mac: ~/Library/Application Support/Bitcoin
 633     // Unix: ~/.bitcoin
 634 #ifdef __WXMSW__
 635     // Windows
 636     return MyGetSpecialFolderPath(CSIDL_APPDATA, true) + "\\Bitcoin";
 637 #else
 638     char* pszHome = getenv("HOME");
 639     if (pszHome == NULL || strlen(pszHome) == 0)
 640         pszHome = (char*)"/";
 641     string strHome = pszHome;
 642     if (strHome[strHome.size()-1] != '/')
 643         strHome += '/';
 644 #ifdef __WXMAC_OSX__
 645     // Mac
 646     strHome += "Library/Application Support/";
 647     filesystem::create_directory(strHome.c_str());
 648     return strHome + "Bitcoin";
 649 #else
 650     // Unix
 651     return strHome + ".bitcoin";
 652 #endif
 653 #endif
 654 }
 655
 656 void GetDataDir(char* pszDir)
 657 {
 658     // pszDir must be at least MAX_PATH length.
 659     int nVariation;
 660     if (pszSetDataDir[0] != 0)
 661     {
 662         strlcpy(pszDir, pszSetDataDir, MAX_PATH);
 663         nVariation = 0;
 664     }
 665     else
 666     {
 667         // This can be called during exceptions by printf, so we cache the
 668         // value so we don't have to do memory allocations after that.
 669         static char pszCachedDir[MAX_PATH];
 670         if (pszCachedDir[0] == 0)
 671             strlcpy(pszCachedDir, GetDefaultDataDir().c_str(), sizeof(pszCachedDir));
 672         strlcpy(pszDir, pszCachedDir, MAX_PATH);
 673         nVariation = 1;
 674     }
 675     if (fTestNet)
 676     {
 677         char* p = pszDir + strlen(pszDir);
 678         if (p > pszDir && p[-1] != '/' && p[-1] != '\\')
 679             *p++ = '/';
 680         strcpy(p, "testnet");
 681         nVariation += 2;
 682     }
 683     static bool pfMkdir[4];
 684     if (!pfMkdir[nVariation])
 685     {
 686         pfMkdir[nVariation] = true;
 687         filesystem::create_directory(pszDir);
 688     }
 689 }
 690
 691 string GetDataDir()
 692 {
 693     char pszDir[MAX_PATH];
 694     GetDataDir(pszDir);
 695     return pszDir;
 696 }
 697
 698 string GetConfigFile()
 699 {
 700     namespace fs = boost::filesystem;
 701     fs::path pathConfig(GetArg("-conf", "bitcoin.conf"));
 702     if (!pathConfig.is_complete())
 703         pathConfig = fs::path(GetDataDir()) / pathConfig;
 704     return pathConfig.string();
 705 }
 706
 707 void ReadConfigFile(map<string, string>& mapSettingsRet,
 708                     map<string, vector<string> >& mapMultiSettingsRet)
 709 {
 710     namespace fs = boost::filesystem;
 711     namespace pod = boost::program_options::detail;
 712
 713     fs::ifstream streamConfig(GetConfigFile());
 714     if (!streamConfig.good())
 715         return;
 716
 717     set<string> setOptions;
 718     setOptions.insert("*");
 719
 720     for (pod::config_file_iterator it(streamConfig, setOptions), end; it != end; ++it)
 721     {
 722         // Don't overwrite existing settings so command line settings override bitcoin.conf
 723         string strKey = string("-") + it->string_key;
 724         if (mapSettingsRet.count(strKey) == 0)
 725             mapSettingsRet[strKey] = it->value[0];
 726         mapMultiSettingsRet[strKey].push_back(it->value[0]);
 727     }
 728 }
 729
 730 int GetFilesize(FILE* file)
 731 {
 732     int nSavePos = ftell(file);
 733     int nFilesize = -1;
 734     if (fseek(file, 0, SEEK_END) == 0)
 735         nFilesize = ftell(file);
 736     fseek(file, nSavePos, SEEK_SET);
 737     return nFilesize;
 738 }
 739
 740 void ShrinkDebugFile()
 741 {
 742     // Scroll debug.log if it's getting too big
 743     string strFile = GetDataDir() + "/debug.log";
 744     FILE* file = fopen(strFile.c_str(), "r");
 745     if (file && GetFilesize(file) > 10 * 1000000)
 746     {
 747         // Restart the file with some of the end
 748         char pch[200000];
 749         fseek(file, -sizeof(pch), SEEK_END);
 750         int nBytes = fread(pch, 1, sizeof(pch), file);
 751         fclose(file);
 752         if (file = fopen(strFile.c_str(), "w"))
 753         {
 754             fwrite(pch, 1, nBytes, file);
 755             fclose(file);
 756         }
 757     }
 758 }
 759
 760
 761
 762
 763
 764
 765
 766
 767 //
 768 // "Never go to sea with two chronometers; take one or three."
 769 // Our three time sources are:
 770 //  - System clock
 771 //  - Median of other nodes's clocks
 772 //  - The user (asking the user to fix the system clock if the first two disagree)
 773 //
 774 int64 GetTime()
 775 {
 776     return time(NULL);
 777 }
 778
 779 static int64 nTimeOffset = 0;
 780
 781 int64 GetAdjustedTime()
 782 {
 783     return GetTime() + nTimeOffset;
 784 }
 785
 786 void AddTimeData(unsigned int ip, int64 nTime)
 787 {
 788     int64 nOffsetSample = nTime - GetTime();
 789
 790     // Ignore duplicates
 791     static set<unsigned int> setKnown;
 792     if (!setKnown.insert(ip).second)
 793         return;
 794
 795     // Add data
 796     static vector<int64> vTimeOffsets;
 797     if (vTimeOffsets.empty())
 798         vTimeOffsets.push_back(0);
 799     vTimeOffsets.push_back(nOffsetSample);
 800     printf("Added time data, samples %d, offset %+"PRI64d" (%+"PRI64d" minutes)\n", vTimeOffsets.size(), vTimeOffsets.back(), vTimeOffsets.back()/60);
 801     if (vTimeOffsets.size() >= 5 && vTimeOffsets.size() % 2 == 1)
 802     {
 803         sort(vTimeOffsets.begin(), vTimeOffsets.end());
 804         int64 nMedian = vTimeOffsets[vTimeOffsets.size()/2];
 805         // Only let other nodes change our time by so much
 806         if (abs64(nMedian) < 70 * 60)
 807         {
 808             nTimeOffset = nMedian;
 809         }
 810         else
 811         {
 812             nTimeOffset = 0;
 813
 814             static bool fDone;
 815             if (!fDone)
 816             {
 817                 // If nobody has a time different than ours but within 5 minutes of ours, give a warning
 818                 bool fMatch = false;
 819                 foreach(int64 nOffset, vTimeOffsets)
 820                     if (nOffset != 0 && abs64(nOffset) < 5 * 60)
 821                         fMatch = true;
 822
 823                 if (!fMatch)
 824                 {
 825                     fDone = true;
 826                     string strMessage = _("Warning: Please check that your computer's date and time are correct.  If your clock is wrong Bitcoin will not work properly.");
 827                     strMiscWarning = strMessage;
 828                     printf("*** %s\n", strMessage.c_str());
 829                     boost::thread(boost::bind(ThreadSafeMessageBox, strMessage+" ", string("Bitcoin"), wxOK | wxICON_EXCLAMATION, (wxWindow*)NULL, -1, -1));
 830                 }
 831             }
 832         }
 833         foreach(int64 n, vTimeOffsets)
 834             printf("%+"PRI64d"  ", n);
 835         printf("|  nTimeOffset = %+"PRI64d"  (%+"PRI64d" minutes)\n", nTimeOffset, nTimeOffset/60);
 836     }
 837 }