simplify CDBEnv::Open() / fix small glitches

- remove pathEnv from CDBEnv, as this attribute is not needed
- change path parameter in ::Open() to a reference
- make nDbCache variable an unsigned integer
- remove a missplaced ";" behin ::IsMock()

src/db.cpp

@@ -55,7 +55,7 @@ void CDBEnv::Close()
     EnvShutdown();
 }
 
-bool CDBEnv::Open(boost::filesystem::path pathEnv_)
+bool CDBEnv::Open(const boost::filesystem::path& path)
 {
     if (fDbEnvInit)
         return true;
@@ -63,18 +63,16 @@ bool CDBEnv::Open(boost::filesystem::path pathEnv_)
     if (fShutdown)
         return false;
 
-    pathEnv = pathEnv_;
+    filesystem::path pathLogDir = path / "database";
-    filesystem::path pathDataDir = pathEnv;
-    filesystem::path pathLogDir = pathDataDir / "database";
     filesystem::create_directory(pathLogDir);
-    filesystem::path pathErrorFile = pathDataDir / "db.log";
+    filesystem::path pathErrorFile = path / "db.log";
     printf("dbenv.open LogDir=%s ErrorFile=%s\n", pathLogDir.string().c_str(), pathErrorFile.string().c_str());
 
     unsigned int nEnvFlags = 0;
     if (GetBoolArg("-privdb", true))
         nEnvFlags |= DB_PRIVATE;
 
-    int nDbCache = GetArg("-dbcache", 25);
+    unsigned int nDbCache = GetArg("-dbcache", 25);
     dbenv.set_lg_dir(pathLogDir.string().c_str());
     dbenv.set_cachesize(nDbCache / 1024, (nDbCache % 1024)*1048576, 1);
     dbenv.set_lg_bsize(1048576);
@@ -85,7 +83,7 @@ bool CDBEnv::Open(boost::filesystem::path pathEnv_)
     dbenv.set_flags(DB_AUTO_COMMIT, 1);
     dbenv.set_flags(DB_TXN_WRITE_NOSYNC, 1);
     dbenv.log_set_config(DB_LOG_AUTO_REMOVE, 1);
-    int ret = dbenv.open(pathDataDir.string().c_str(),
+    int ret = dbenv.open(path.string().c_str(),
                      DB_CREATE     |
                      DB_INIT_LOCK  |
                      DB_INIT_LOG   |

src/db.h

@@ -33,7 +33,6 @@ class CDBEnv
 private:
     bool fDbEnvInit;
     bool fMockDb;
-    boost::filesystem::path pathEnv;
 
     void EnvShutdown();
 
@@ -46,7 +45,7 @@ public:
     CDBEnv();
     ~CDBEnv();
     void MakeMock();
-    bool IsMock() { return fMockDb; };
+    bool IsMock() { return fMockDb; }
 
     /*
      * Verify that database file strFile is OK. If it is not,
@@ -66,7 +65,7 @@ public:
     typedef std::pair<std::vector<unsigned char>, std::vector<unsigned char> > KeyValPair;
     bool Salvage(std::string strFile, bool fAggressive, std::vector<KeyValPair>& vResult);
 
-    bool Open(boost::filesystem::path pathEnv_);
+    bool Open(const boost::filesystem::path &path);
     void Close();
     void Flush(bool fShutdown);
     void CheckpointLSN(std::string strFile);