Merge branch '0.4.x' into 0.5.x

src/bignum.h

@@ -130,7 +130,9 @@ public:
 
         if (sn < (int64)0)
         {
-            n = -sn;
+            // Since the minimum signed integer cannot be represented as positive so long as its type is signed, and it's not well-defined what happens if you make it unsigned before negating it, we instead increment the negative integer by 1, convert it, then increment the (now positive) unsigned integer by 1 to compensate
+            n = -(sn + 1);
+            ++n;
             fNegative = true;
         } else {
             n = sn;
@@ -413,7 +415,7 @@ public:
     CBigNum& operator>>=(unsigned int shift)
     {
         // Note: BN_rshift segfaults on 64-bit if 2^shift is greater than the number
-        //   if built on ubuntu 9.04 or 9.10, probably depends on version of openssl
+        //   if built on ubuntu 9.04 or 9.10, probably depends on version of OpenSSL
         CBigNum a = 1;
         a <<= shift;
         if (BN_cmp(&a, this) > 0)

src/main.cpp

@@ -697,7 +697,7 @@ int64 static GetBlockValue(int nHeight, int64 nFees)
 {
     int64 nSubsidy = 50 * COIN;
 
-    // Subsidy is cut in half every 4 years
+    // Subsidy is cut in half every 210000 blocks, which will occur approximately every 4 years
     nSubsidy >>= (nHeight / 210000);
 
     return nSubsidy + nFees;

src/util.cpp

@@ -54,7 +54,7 @@ extern "C" void tss_cleanup_implemented() { }
 
 
 
-// Init openssl library multithreading support
+// Init OpenSSL library multithreading support
 static boost::interprocess::interprocess_mutex** ppmutexOpenSSL;
 void locking_callback(int mode, int i, const char* file, int line)
 {
@@ -70,7 +70,7 @@ class CInit
 public:
     CInit()
     {
-        // Init openssl library multithreading support
+        // Init OpenSSL library multithreading support
         ppmutexOpenSSL = (boost::interprocess::interprocess_mutex**)OPENSSL_malloc(CRYPTO_num_locks() * sizeof(boost::interprocess::interprocess_mutex*));
         for (int i = 0; i < CRYPTO_num_locks(); i++)
             ppmutexOpenSSL[i] = new boost::interprocess::interprocess_mutex();
@@ -86,7 +86,7 @@ public:
     }
     ~CInit()
     {
-        // Shutdown openssl library multithreading support
+        // Shutdown OpenSSL library multithreading support
         CRYPTO_set_locking_callback(NULL);
         for (int i = 0; i < CRYPTO_num_locks(); i++)
             delete ppmutexOpenSSL[i];