Combine datacarrier globals into one

Author: MacroFake

src/init.cpp

@@ -975,8 +975,11 @@ bool AppInitParameterInteraction(const ArgsManager& args, bool use_syscall_sandb
 
     if (!g_wallet_init_interface.ParameterInteraction()) return false;
 
-    fAcceptDatacarrier = args.GetBoolArg("-datacarrier", DEFAULT_ACCEPT_DATACARRIER);
-    nMaxDatacarrierBytes = args.GetIntArg("-datacarriersize", nMaxDatacarrierBytes);
+    if (args.GetBoolArg("-datacarrier", DEFAULT_ACCEPT_DATACARRIER)) {
+        g_max_datacarrier_bytes = args.GetIntArg("-datacarriersize", MAX_OP_RETURN_RELAY);
+    } else {
+        g_max_datacarrier_bytes = std::nullopt;
+    }
 
     // Option to startup with mocktime set (used for regression testing):
     SetMockTime(args.GetIntArg("-mocktime", 0)); // SetMockTime(0) is a no-op

src/policy/policy.cpp

@@ -82,9 +82,10 @@ bool IsStandard(const CScript& scriptPubKey, TxoutType& whichType)
             return false;
         if (m < 1 || m > n)
             return false;
-    } else if (whichType == TxoutType::NULL_DATA &&
-               (!fAcceptDatacarrier || scriptPubKey.size() > nMaxDatacarrierBytes)) {
-          return false;
+    } else if (whichType == TxoutType::NULL_DATA) {
+        if (!g_max_datacarrier_bytes || scriptPubKey.size() > *g_max_datacarrier_bytes) {
+            return false;
+        }
     }
 
     return true;

src/script/standard.cpp

@@ -16,8 +16,7 @@
 
 typedef std::vector<unsigned char> valtype;
 
-bool fAcceptDatacarrier = DEFAULT_ACCEPT_DATACARRIER;
-unsigned nMaxDatacarrierBytes = MAX_OP_RETURN_RELAY;
+std::optional<unsigned> g_max_datacarrier_bytes{DEFAULT_ACCEPT_DATACARRIER ? std::optional{MAX_OP_RETURN_RELAY} : std::nullopt};
 
 CScriptID::CScriptID(const CScript& in) : BaseHash(Hash160(in)) {}
 CScriptID::CScriptID(const ScriptHash& in) : BaseHash(static_cast<uint160>(in)) {}

src/script/standard.h

@@ -13,6 +13,7 @@
 #include <util/hash_type.h>
 
 #include <map>
+#include <optional>
 #include <string>
 #include <variant>
 
@@ -33,19 +34,19 @@ class CScriptID : public BaseHash<uint160>
 };
 
 /**
- * Default setting for nMaxDatacarrierBytes. 80 bytes of data, +1 for OP_RETURN,
+ * Default setting for -datacarriersize. 80 bytes of data, +1 for OP_RETURN,
  * +2 for the pushdata opcodes.
  */
 static const unsigned int MAX_OP_RETURN_RELAY = 83;
 
 /**
  * A data carrying output is an unspendable output containing data. The script
  * type is designated as TxoutType::NULL_DATA.
+ *
+ * Maximum size of TxoutType::NULL_DATA scripts that this node considers standard.
+ * If nullopt, any size is nonstandard.
  */
-extern bool fAcceptDatacarrier;
-
-/** Maximum size of TxoutType::NULL_DATA scripts that this node considers standard. */
-extern unsigned nMaxDatacarrierBytes;
+extern std::optional<unsigned> g_max_datacarrier_bytes;
 
 /**
  * Mandatory script verification flags that all new blocks must comply with for