Introduce a CChainParameters singleton class and regtest mode.

The new class is accessed via the Params() method and holds
most things that vary between main, test and regtest networks.
The regtest mode has two purposes, one is to run the
bitcoind/bitcoinj comparison tool which compares two separate
implementations of the Bitcoin protocol looking for divergence.

The other is that when run, you get a local node which can mine
a single block instantly, which is highly convenient for testing
apps during development as there's no need to wait 10 minutes for
a block on the testnet.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/bitcoind.cpp b/src/bitcoind.cpp
index 682a214fb2..bc23cf5507 100644
--- a/src/bitcoind.cpp
+++ b/src/bitcoind.cpp
@@ -67,6 +67,10 @@ bool AppInit(int argc, char* argv[])
 
         if (fCommandLine)
         {
+            if (!SelectParamsFromCommandLine()) {
+                fprintf(stderr, "Error: invalid combination of -regtest and -testnet.\n");
+                return false;
+            }
             int ret = CommandLineRPC(argc, argv);
             exit(ret);
         }