listsinceblock now shows txns with 0 confirms, as well as allows the lastblock return property to be targeted to the block with the specified depth

src/rpc.cpp

@@ -1234,10 +1234,11 @@ Value listsinceblock(const Array& params, bool fHelp)
 {
     if (fHelp)
         throw runtime_error(
-            "listsinceblock [blockid]\n"
+            "listsinceblock [blockid] [target-confirmations]\n"
             "Get all transactions in blocks since block [blockid], or all transactions if omitted");
 
     CBlockIndex *pindex = NULL;
+    int target_confirms = 1;
 
     if (params.size() > 0)
     {
@@ -1247,6 +1248,14 @@ Value listsinceblock(const Array& params, bool fHelp)
         pindex = CBlockLocator(blockId).GetBlockIndex();
     }
 
+    if (params.size() > 1)
+    {
+        target_confirms = params[1].get_int();
+
+        if (target_confirms < 1)
+            throw JSONRPCError(-8, "Invalid parameter");
+    }
+
     int depth = pindex ? (1 + nBestHeight - pindex->nHeight) : -1;
 
     Array transactions;
@@ -1257,12 +1266,31 @@ Value listsinceblock(const Array& params, bool fHelp)
         CWalletTx tx = (*it).second;
 
         if (depth == -1 || tx.GetDepthInMainChain() < depth)
-            ListTransactions(tx, "*", 1, true, transactions);
+            ListTransactions(tx, "*", 0, true, transactions);
+    }
+
+    uint256 lastblock;
+
+    if (target_confirms == 1)
+    {
+        printf("oops!\n");
+        lastblock = hashBestChain;
+    }
+    else
+    {
+        int target_height = pindexBest->nHeight + 1 - target_confirms;
+
+        CBlockIndex *block;
+        for (block = pindexBest;
+             block && block->nHeight > target_height;
+             block = block->pprev);
+
+        lastblock = block ? block->GetBlockHash() : 0;
     }
 
     Object ret;
     ret.push_back(Pair("transactions", transactions));
-    ret.push_back(Pair("lastblock", hashBestChain.GetHex()));
+    ret.push_back(Pair("lastblock", lastblock.GetHex()));
 
     return ret;
 }
@@ -2168,6 +2196,7 @@ int CommandLineRPC(int argc, char *argv[])
         if (strMethod == "listtransactions"       && n > 1) ConvertTo<boost::int64_t>(params[1]);
         if (strMethod == "listtransactions"       && n > 2) ConvertTo<boost::int64_t>(params[2]);
         if (strMethod == "listaccounts"           && n > 0) ConvertTo<boost::int64_t>(params[0]);
+        if (strMethod == "listsinceblock"         && n > 1) ConvertTo<boost::int64_t>(params[1]);
         if (strMethod == "sendmany"               && n > 1)
         {
             string s = params[1].get_str();