Merge pull request #1140 from jgarzik/sign-compare

Address many more sign comparison warnings

13 files changed, 74 insertions, 64 deletions

diff --git a/src/bignum.h b/src/bignum.h
index 0d57dc8a8e..f0971e8850 100644
--- a/src/bignum.h
+++ b/src/bignum.h
@@ -117,9 +117,9 @@ public:
     {
         unsigned long n = BN_get_word(this);
         if (!BN_is_negative(this))
-            return (n > std::numeric_limits<int>::max() ? std::numeric_limits<int>::max() : n);
+            return (n > (unsigned long)std::numeric_limits<int>::max() ? std::numeric_limits<int>::max() : n);
         else
-            return (n > std::numeric_limits<int>::max() ? std::numeric_limits<int>::min() : -(int)n);
+            return (n > (unsigned long)std::numeric_limits<int>::max() ? std::numeric_limits<int>::min() : -(int)n);
     }
 
     void setint64(int64 n)
@@ -222,7 +222,7 @@ public:
         if (vch.size() > 4)
             vch[4] &= 0x7f;
         uint256 n = 0;
-        for (int i = 0, j = vch.size()-1; i < sizeof(n) && j >= 4; i++, j--)
+        for (unsigned int i = 0, j = vch.size()-1; i < sizeof(n) && j >= 4; i++, j--)
             ((unsigned char*)&n)[i] = vch[j];
         return n;
     }
diff --git a/src/bitcoinrpc.cpp b/src/bitcoinrpc.cpp
index 206347faf8..2262923911 100644
--- a/src/bitcoinrpc.cpp
+++ b/src/bitcoinrpc.cpp
@@ -999,7 +999,7 @@ Value addmultisigaddress(const Array& params, bool fHelp)
         strAccount = AccountFromValue(params[2]);
 
     // Gather public keys
-    if (nRequired < 1 || keys.size() < nRequired)
+    if ((nRequired < 1) || ((int)keys.size() < nRequired))
         throw runtime_error(
             strprintf("wrong number of keys"
                       "(got %d, need at least %d)", keys.size(), nRequired));
@@ -1331,8 +1331,10 @@ Value listtransactions(const Array& params, bool fHelp)
     }
     // ret is newest to oldest
     
-    if (nFrom > ret.size()) nFrom = ret.size();
-    if (nFrom+nCount > ret.size()) nCount = ret.size()-nFrom;
+    if (nFrom > (int)ret.size())
+        nFrom = ret.size();
+    if ((nFrom + nCount) > (int)ret.size())
+        nCount = ret.size() - nFrom;
     Array::iterator first = ret.begin();
     std::advance(first, nFrom);
     Array::iterator last = ret.begin();
@@ -2202,7 +2204,7 @@ int ReadHTTP(std::basic_istream<char>& stream, map<string, string>& mapHeadersRe
 
     // Read header
     int nLen = ReadHTTPHeader(stream, mapHeadersRet);
-    if (nLen < 0 || nLen > MAX_SIZE)
+    if (nLen < 0 || nLen > (int)MAX_SIZE)
         return 500;
 
     // Read message
diff --git a/src/db.cpp b/src/db.cpp
index 39a41894d7..53da378fee 100644
--- a/src/db.cpp
+++ b/src/db.cpp
@@ -648,7 +648,7 @@ bool CTxDB::LoadBlockIndex()
                             }
                     }
                     // check level 4: check whether spent txouts were spent within the main chain
-                    int nOutput = 0;
+                    unsigned int nOutput = 0;
                     if (nCheckLevel>3)
                     {
                         BOOST_FOREACH(const CDiskTxPos &txpos, txindex.vSpent)
diff --git a/src/main.cpp b/src/main.cpp
index 78d84d9064..e5d110d8ef 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -195,9 +195,9 @@ void static EraseOrphanTx(uint256 hash)
     mapOrphanTransactions.erase(hash);
 }
 
-int LimitOrphanTxSize(int nMaxOrphans)
+unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans)
 {
-    int nEvicted = 0;
+    unsigned int nEvicted = 0;
     while (mapOrphanTransactions.size() > nMaxOrphans)
     {
         // Evict a random orphan:
@@ -297,6 +297,8 @@ bool CTransaction::AreInputsStandard(const MapPrevTx& mapInputs) const
         if (!Solver(prevScript, whichType, vSolutions))
             return false;
         int nArgsExpected = ScriptSigArgsExpected(whichType, vSolutions);
+        if (nArgsExpected < 0)
+            return false;
 
         // Transactions with extra stuff in their scriptSigs are
         // non-standard. Note that this EvalScript() call will
@@ -318,20 +320,25 @@ bool CTransaction::AreInputsStandard(const MapPrevTx& mapInputs) const
                 return false;
             if (whichType2 == TX_SCRIPTHASH)
                 return false;
-            nArgsExpected += ScriptSigArgsExpected(whichType2, vSolutions2);
+
+            int tmpExpected;
+            tmpExpected = ScriptSigArgsExpected(whichType2, vSolutions2);
+            if (tmpExpected < 0)
+                return false;
+            nArgsExpected += tmpExpected;
         }
 
-        if (stack.size() != nArgsExpected)
+        if (stack.size() != (unsigned int)nArgsExpected)
             return false;
     }
 
     return true;
 }
 
-int
+unsigned int
 CTransaction::GetLegacySigOpCount() const
 {
-    int nSigOps = 0;
+    unsigned int nSigOps = 0;
     BOOST_FOREACH(const CTxIn& txin, vin)
     {
         nSigOps += txin.scriptSig.GetSigOpCount(false);
@@ -369,10 +376,10 @@ int CMerkleTx::SetMerkleBranch(const CBlock* pblock)
         hashBlock = pblock->GetHash();
 
         // Locate the transaction
-        for (nIndex = 0; nIndex < pblock->vtx.size(); nIndex++)
+        for (nIndex = 0; nIndex < (int)pblock->vtx.size(); nIndex++)
             if (pblock->vtx[nIndex] == *(CTransaction*)this)
                 break;
-        if (nIndex == pblock->vtx.size())
+        if (nIndex == (int)pblock->vtx.size())
         {
             vMerkleBranch.clear();
             nIndex = -1;
@@ -1079,12 +1086,12 @@ int64 CTransaction::GetValueIn(const MapPrevTx& inputs) const
 
 }
 
-int CTransaction::GetP2SHSigOpCount(const MapPrevTx& inputs) const
+unsigned int CTransaction::GetP2SHSigOpCount(const MapPrevTx& inputs) const
 {
     if (IsCoinBase())
         return 0;
 
-    int nSigOps = 0;
+    unsigned int nSigOps = 0;
     for (unsigned int i = 0; i < vin.size(); i++)
     {
         const CTxOut& prevout = GetOutputFor(vin[i], inputs);
@@ -1284,7 +1291,7 @@ bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
 
     map<uint256, CTxIndex> mapQueuedChanges;
     int64 nFees = 0;
-    int nSigOps = 0;
+    unsigned int nSigOps = 0;
     BOOST_FOREACH(CTransaction& tx, vtx)
     {
         nSigOps += tx.GetLegacySigOpCount();
@@ -1645,7 +1652,7 @@ bool CBlock::CheckBlock() const
         if (!tx.CheckTransaction())
             return DoS(tx.nDoS, error("CheckBlock() : CheckTransaction failed"));
 
-    int nSigOps = 0;
+    unsigned int nSigOps = 0;
     BOOST_FOREACH(const CTransaction& tx, vtx)
     {
         nSigOps += tx.GetLegacySigOpCount();
@@ -2583,9 +2590,9 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
             AddOrphanTx(vMsg);
 
             // DoS prevention: do not allow mapOrphanTransactions to grow unbounded
-            int nEvicted = LimitOrphanTxSize(MAX_ORPHAN_TRANSACTIONS);
+            unsigned int nEvicted = LimitOrphanTxSize(MAX_ORPHAN_TRANSACTIONS);
             if (nEvicted > 0)
-                printf("mapOrphan overflow, removed %d tx\n", nEvicted);
+                printf("mapOrphan overflow, removed %u tx\n", nEvicted);
         }
         if (tx.nDoS) pfrom->Misbehaving(tx.nDoS);
     }
@@ -2743,7 +2750,7 @@ bool ProcessMessages(CNode* pfrom)
         int nHeaderSize = vRecv.GetSerializeSize(CMessageHeader());
         if (vRecv.end() - pstart < nHeaderSize)
         {
-            if (vRecv.size() > nHeaderSize)
+            if ((int)vRecv.size() > nHeaderSize)
             {
                 printf("\n\nPROCESSMESSAGE MESSAGESTART NOT FOUND\n\n");
                 vRecv.erase(vRecv.begin(), vRecv.end() - nHeaderSize);
@@ -3077,7 +3084,7 @@ unsigned int static ScanHash_CryptoPP(char* pmidstate, char* pdata, char* phash1
         if ((nNonce & 0xffff) == 0)
         {
             nHashesDone = 0xffff+1;
-            return -1;
+            return (unsigned int) -1;
         }
     }
 }
@@ -3209,7 +3216,7 @@ CBlock* CreateNewBlock(CReserveKey& reservekey)
                 continue;
 
             // Legacy limits on sigOps:
-            int nTxSigOps = tx.GetLegacySigOpCount();
+            unsigned int nTxSigOps = tx.GetLegacySigOpCount();
             if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
                 continue;
 
@@ -3454,7 +3461,7 @@ void static BitcoinMiner(CWallet *pwallet)
                                             (char*)&hash, nHashesDone);
 
             // Check if something found
-            if (nNonceFound != -1)
+            if (nNonceFound != (unsigned int) -1)
             {
                 for (unsigned int i = 0; i < sizeof(hash)/4; i++)
                     ((unsigned int*)&hash)[i] = ByteReverse(((unsigned int*)&hash)[i]);
diff --git a/src/main.h b/src/main.h
index a814092ac2..262e77e806 100644
--- a/src/main.h
+++ b/src/main.h
@@ -28,8 +28,8 @@ class CNode;
 
 static const unsigned int MAX_BLOCK_SIZE = 1000000;
 static const unsigned int MAX_BLOCK_SIZE_GEN = MAX_BLOCK_SIZE/2;
-static const int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50;
-static const int MAX_ORPHAN_TRANSACTIONS = MAX_BLOCK_SIZE/100;
+static const unsigned int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50;
+static const unsigned int MAX_ORPHAN_TRANSACTIONS = MAX_BLOCK_SIZE/100;
 static const int64 MIN_TX_FEE = 50000;
 static const int64 MIN_RELAY_TX_FEE = 10000;
 static const int64 MAX_MONEY = 21000000 * COIN;
@@ -437,7 +437,7 @@ public:
             nBlockHeight = nBestHeight;
         if (nBlockTime == 0)
             nBlockTime = GetAdjustedTime();
-        if ((int64)nLockTime < (nLockTime < LOCKTIME_THRESHOLD ? (int64)nBlockHeight : nBlockTime))
+        if ((int64)nLockTime < ((int64)nLockTime < LOCKTIME_THRESHOLD ? (int64)nBlockHeight : nBlockTime))
             return true;
         BOOST_FOREACH(const CTxIn& txin, vin)
             if (!txin.IsFinal())
@@ -495,7 +495,7 @@ public:
         @return number of sigops this transaction's outputs will produce when spent
         @see CTransaction::FetchInputs
     */
-    int GetLegacySigOpCount() const;
+    unsigned int GetLegacySigOpCount() const;
 
     /** Count ECDSA signature operations in pay-to-script-hash inputs.
 
@@ -503,7 +503,7 @@ public:
         @return maximum number of sigops required to validate this transaction's inputs
         @see CTransaction::FetchInputs
      */
-    int GetP2SHSigOpCount(const MapPrevTx& mapInputs) const;
+    unsigned int GetP2SHSigOpCount(const MapPrevTx& mapInputs) const;
 
     /** Amount of bitcoins spent by this transaction.
         @return sum of all outputs (note: does not include fees)
@@ -944,9 +944,10 @@ public:
         fileout << FLATDATA(pchMessageStart) << nSize;
 
         // Write block
-        nBlockPosRet = ftell(fileout);
-        if (nBlockPosRet == -1)
+        long fileOutPos = ftell(fileout);
+        if (fileOutPos < 0)
             return error("CBlock::WriteToDisk() : ftell failed");
+        nBlockPosRet = fileOutPos;
         fileout << *this;
 
         // Flush stdio buffers and commit to disk before returning
diff --git a/src/net.cpp b/src/net.cpp
index 38c0d3d582..d218dcfb5d 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -498,7 +498,7 @@ void ThreadSocketHandler2(void* parg)
 {
     printf("ThreadSocketHandler started\n");
     list<CNode*> vNodesDisconnected;
-    int nPrevNodeCount = 0;
+    unsigned int nPrevNodeCount = 0;
 
     loop
     {
diff --git a/src/protocol.cpp b/src/protocol.cpp
index 06306cf8e1..fda31966f2 100644
--- a/src/protocol.cpp
+++ b/src/protocol.cpp
@@ -128,7 +128,7 @@ bool operator<(const CInv& a, const CInv& b)
 
 bool CInv::IsKnownType() const
 {
-    return (type >= 1 && type < ARRAYLEN(ppszTypeName));
+    return (type >= 1 && type < (int)ARRAYLEN(ppszTypeName));
 }
 
 const char* CInv::GetCommand() const
diff --git a/src/script.cpp b/src/script.cpp
index fc0a5b3eaa..660023ef48 100644
--- a/src/script.cpp
+++ b/src/script.cpp
@@ -38,7 +38,7 @@ CBigNum CastToBigNum(const valtype& vch)
 
 bool CastToBool(const valtype& vch)
 {
-    for (int i = 0; i < vch.size(); i++)
+    for (unsigned int i = 0; i < vch.size(); i++)
     {
         if (vch[i] != 0)
         {
@@ -536,7 +536,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                         return false;
                     int n = CastToBigNum(stacktop(-1)).getint();
                     popstack(stack);
-                    if (n < 0 || n >= stack.size())
+                    if (n < 0 || n >= (int)stack.size())
                         return false;
                     valtype vch = stacktop(-n-1);
                     if (opcode == OP_ROLL)
@@ -604,9 +604,9 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                     int nEnd = nBegin + CastToBigNum(stacktop(-1)).getint();
                     if (nBegin < 0 || nEnd < nBegin)
                         return false;
-                    if (nBegin > vch.size())
+                    if (nBegin > (int)vch.size())
                         nBegin = vch.size();
-                    if (nEnd > vch.size())
+                    if (nEnd > (int)vch.size())
                         nEnd = vch.size();
                     vch.erase(vch.begin() + nEnd, vch.end());
                     vch.erase(vch.begin(), vch.begin() + nBegin);
@@ -625,7 +625,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                     int nSize = CastToBigNum(stacktop(-1)).getint();
                     if (nSize < 0)
                         return false;
-                    if (nSize > vch.size())
+                    if (nSize > (int)vch.size())
                         nSize = vch.size();
                     if (opcode == OP_LEFT)
                         vch.erase(vch.begin() + nSize, vch.end());
@@ -655,7 +655,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                     if (stack.size() < 1)
                         return false;
                     valtype& vch = stacktop(-1);
-                    for (int i = 0; i < vch.size(); i++)
+                    for (unsigned int i = 0; i < vch.size(); i++)
                         vch[i] = ~vch[i];
                 }
                 break;
@@ -672,17 +672,17 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                     MakeSameSize(vch1, vch2);
                     if (opcode == OP_AND)
                     {
-                        for (int i = 0; i < vch1.size(); i++)
+                        for (unsigned int i = 0; i < vch1.size(); i++)
                             vch1[i] &= vch2[i];
                     }
                     else if (opcode == OP_OR)
                     {
-                        for (int i = 0; i < vch1.size(); i++)
+                        for (unsigned int i = 0; i < vch1.size(); i++)
                             vch1[i] |= vch2[i];
                     }
                     else if (opcode == OP_XOR)
                     {
-                        for (int i = 0; i < vch1.size(); i++)
+                        for (unsigned int i = 0; i < vch1.size(); i++)
                             vch1[i] ^= vch2[i];
                     }
                     popstack(stack);
@@ -939,7 +939,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                 {
                     // ([sig ...] num_of_signatures [pubkey ...] num_of_pubkeys -- bool)
 
-                    int i = 1;
+                    unsigned int i = 1;
                     if (stack.size() < i)
                         return false;
 
@@ -1050,7 +1050,7 @@ uint256 SignatureHash(CScript scriptCode, const CTransaction& txTo, unsigned int
     scriptCode.FindAndDelete(CScript(OP_CODESEPARATOR));
 
     // Blank out other inputs' signatures
-    for (int i = 0; i < txTmp.vin.size(); i++)
+    for (unsigned int i = 0; i < txTmp.vin.size(); i++)
         txTmp.vin[i].scriptSig = CScript();
     txTmp.vin[nIn].scriptSig = scriptCode;
 
@@ -1061,7 +1061,7 @@ uint256 SignatureHash(CScript scriptCode, const CTransaction& txTo, unsigned int
         txTmp.vout.clear();
 
         // Let the others update at will
-        for (int i = 0; i < txTmp.vin.size(); i++)
+        for (unsigned int i = 0; i < txTmp.vin.size(); i++)
             if (i != nIn)
                 txTmp.vin[i].nSequence = 0;
     }
@@ -1075,11 +1075,11 @@ uint256 SignatureHash(CScript scriptCode, const CTransaction& txTo, unsigned int
             return 1;
         }
         txTmp.vout.resize(nOut+1);
-        for (int i = 0; i < nOut; i++)
+        for (unsigned int i = 0; i < nOut; i++)
             txTmp.vout[i].SetNull();
 
         // Let the others update at will
-        for (int i = 0; i < txTmp.vin.size(); i++)
+        for (unsigned int i = 0; i < txTmp.vin.size(); i++)
             if (i != nIn)
                 txTmp.vin[i].nSequence = 0;
     }
@@ -1360,9 +1360,9 @@ bool IsStandard(const CScript& scriptPubKey)
 }
 
 
-int HaveKeys(const vector<valtype>& pubkeys, const CKeyStore& keystore)
+unsigned int HaveKeys(const vector<valtype>& pubkeys, const CKeyStore& keystore)
 {
-    int nResult = 0;
+    unsigned int nResult = 0;
     BOOST_FOREACH(const valtype& pubkey, pubkeys)
     {
         CBitcoinAddress address;
@@ -1449,7 +1449,7 @@ bool ExtractAddresses(const CScript& scriptPubKey, txnouttype& typeRet, vector<C
     if (typeRet == TX_MULTISIG)
     {
         nRequiredRet = vSolutions.front()[0];
-        for (int i = 1; i < vSolutions.size()-1; i++)
+        for (unsigned int i = 1; i < vSolutions.size()-1; i++)
         {
             CBitcoinAddress address;
             address.SetPubKey(vSolutions[i]);
@@ -1566,9 +1566,9 @@ bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsig
     return true;
 }
 
-int CScript::GetSigOpCount(bool fAccurate) const
+unsigned int CScript::GetSigOpCount(bool fAccurate) const
 {
-    int n = 0;
+    unsigned int n = 0;
     const_iterator pc = begin();
     opcodetype lastOpcode = OP_INVALIDOPCODE;
     while (pc < end())
@@ -1590,7 +1590,7 @@ int CScript::GetSigOpCount(bool fAccurate) const
     return n;
 }
 
-int CScript::GetSigOpCount(const CScript& scriptSig) const
+unsigned int CScript::GetSigOpCount(const CScript& scriptSig) const
 {
     if (!IsPayToScriptHash())
         return GetSigOpCount(true);
diff --git a/src/script.h b/src/script.h
index b13734be41..e41e09b6b3 100644
--- a/src/script.h
+++ b/src/script.h
@@ -467,7 +467,7 @@ public:
         opcodetype opcode;
         do
         {
-            while (end() - pc >= b.size() && memcmp(&pc[0], &b[0], b.size()) == 0)
+            while (end() - pc >= (long)b.size() && memcmp(&pc[0], &b[0], b.size()) == 0)
             {
                 erase(pc, pc + b.size());
                 ++nFound;
@@ -491,11 +491,11 @@ public:
     // CHECKMULTISIGs serialized in scriptSigs are
     // counted more accurately, assuming they are of the form
     //  ... OP_N CHECKMULTISIG ...
-    int GetSigOpCount(bool fAccurate) const;
+    unsigned int GetSigOpCount(bool fAccurate) const;
 
     // Accurately count sigOps, including sigOps in
     // pay-to-script-hash transactions:
-    int GetSigOpCount(const CScript& scriptSig) const;
+    unsigned int GetSigOpCount(const CScript& scriptSig) const;
 
     bool IsPayToScriptHash() const;
 
diff --git a/src/test/DoS_tests.cpp b/src/test/DoS_tests.cpp
index c0b00102a0..e5a8b4f68b 100644
--- a/src/test/DoS_tests.cpp
+++ b/src/test/DoS_tests.cpp
@@ -14,7 +14,7 @@
 
 // Tests this internal-to-main.cpp method:
 extern void AddOrphanTx(const CDataStream& vMsg);
-extern int LimitOrphanTxSize(int nMaxOrphans);
+extern unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans);
 extern std::map<uint256, CDataStream*> mapOrphanTransactions;
 extern std::multimap<uint256, CDataStream*> mapOrphanTransactionsByPrev;
 
diff --git a/src/util.cpp b/src/util.cpp
index 7322b1e228..cd3d3b94a9 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -283,7 +283,7 @@ int my_snprintf(char* buffer, size_t limit, const char* format, ...)
     va_start(arg_ptr, format);
     int ret = _vsnprintf(buffer, limit, format, arg_ptr);
     va_end(arg_ptr);
-    if (ret < 0 || ret >= limit)
+    if (ret < 0 || ret >= (int)limit)
     {
         ret = limit - 1;
         buffer[limit-1] = 0;
diff --git a/src/util.h b/src/util.h
index 9035b773f1..6c3e6c5450 100644
--- a/src/util.h
+++ b/src/util.h
@@ -579,9 +579,9 @@ template <typename T> class CMedianFilter
 private:
     std::vector<T> vValues;
     std::vector<T> vSorted;
-    int nSize;
+    unsigned int nSize;
 public:
-    CMedianFilter(int size, T initial_value):
+    CMedianFilter(unsigned int size, T initial_value):
         nSize(size)
     {
         vValues.reserve(size);
diff --git a/src/wallet.cpp b/src/wallet.cpp
index 53836be0cd..998909897f 100644
--- a/src/wallet.cpp
+++ b/src/wallet.cpp
@@ -1391,8 +1391,8 @@ bool CWallet::TopUpKeyPool()
         CWalletDB walletdb(strWalletFile);
 
         // Top up key pool
-        int64 nTargetSize = max(GetArg("-keypool", 100), (int64)0);
-        while (setKeyPool.size() < nTargetSize+1)
+        unsigned int nTargetSize = max(GetArg("-keypool", 100), 0LL);
+        while (setKeyPool.size() < (nTargetSize + 1))
         {
             int64 nEnd = 1;
             if (!setKeyPool.empty())