wire: handle bigsize/varint fields.

They're currently called varint, but there's a proposal to call them all
bigsize.  Allow both for now.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

devtools/print_wire.h

@@ -10,6 +10,13 @@ struct tlv_print_record_type {
 	void (*print)(const char *tlv_name, const u8 **cursor, size_t *plen);
 };
 
+typedef u64 bigsize;
+#define printwire_bigsize printwire_u64
+
+/* FIXME: Some versions of spec using 'varint' for bigsize' */
+typedef bigsize varint;
+#define printwire_varint printwire_bigsize
+
 void printwire_u8(const char *fieldname, const u8 *v);
 void printwire_u16(const char *fieldname, const u16 *v);
 void printwire_u32(const char *fieldname, const u32 *v);

tools/generate-wire.py

@@ -160,6 +160,8 @@ class Type(FieldSet):
         'bool',
         'amount_sat',
         'amount_msat',
+        'bigsize',
+        'varint'
     ]
 
     typedefs = [
@@ -172,6 +174,8 @@ class Type(FieldSet):
         'secp256k1_ecdsa_recoverable_signature',
         'wirestring',
         'double',
+        'bigsize',
+        'varint',
     ]
 
     truncated_typedefs = [

wire/wire.h

@@ -31,6 +31,12 @@ struct siphash_seed;
 
 /* Makes generate-wire.py work */
 typedef char wirestring;
+typedef u64 bigsize;
+
+/* FIXME: Some versions of spec using 'varint' for bigsize' */
+typedef bigsize varint;
+#define fromwire_varint fromwire_bigsize
+#define towire_varint towire_bigsize
 
 void derive_channel_id(struct channel_id *channel_id,
 		       const struct bitcoin_txid *txid, u16 txout);