From 6da915c96ae718284351417579949b290b529cf7 Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Sun, 11 Jul 2021 16:29:42 +0930
Subject: [PATCH] lease_rates: lease_rates_eq.

We don't actually use the NULL-is-equal in the one caller, so ignore that.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 common/lease_rates.c | 29 ++++-------------------------
 common/lease_rates.h | 12 +++++++++---
 2 files changed, 13 insertions(+), 28 deletions(-)

diff --git a/common/lease_rates.c b/common/lease_rates.c
index 118269ad5..fb05d454e 100644
--- a/common/lease_rates.c
+++ b/common/lease_rates.c
@@ -7,36 +7,15 @@
 #include <common/lease_rates.h>
 #include <common/overflows.h>
 #include <common/type_to_string.h>
-#include <wire/peer_wire.h>
 
-/* FIXME: Is there a better way to do this ? */
-bool lease_rates_eq(struct lease_rates *l1,
-		    struct lease_rates *l2)
-{
-	if (!l1 != !l2)
-		return false;
-
-	if (!l1)
-		return true;
-
-	return l1->funding_weight == l2->funding_weight
-		&& l1->channel_fee_max_base_msat == l2->channel_fee_max_base_msat
-		&& l1->channel_fee_max_proportional_thousandths == l2->channel_fee_max_proportional_thousandths
-		&& l1->lease_fee_base_sat == l2->lease_fee_base_sat
-		&& l1->lease_fee_basis == l2->lease_fee_basis;
-}
-
-bool lease_rates_empty(struct lease_rates *rates)
+bool lease_rates_empty(const struct lease_rates *rates)
 {
+	/* static means it's zero initialized */
+	static const struct lease_rates zero;
 	if (!rates)
 		return true;
 
-	/* FIXME: why can't i do memeqzero? */
-	return rates->funding_weight == 0
-		&& rates->channel_fee_max_base_msat == 0
-		&& rates->channel_fee_max_proportional_thousandths == 0
-		&& rates->lease_fee_base_sat == 0
-		&& rates->lease_fee_basis == 0;
+	return lease_rates_eq(rates, &zero);
 }
 
 void lease_rates_get_commitment(struct pubkey *pubkey,
diff --git a/common/lease_rates.h b/common/lease_rates.h
index d6e8b5afb..3b70a8342 100644
--- a/common/lease_rates.h
+++ b/common/lease_rates.h
@@ -2,6 +2,7 @@
 #define LIGHTNING_COMMON_LEASE_RATES_H
 #include "config.h"
 #include <stdbool.h>
+#include <wire/peer_wire.h>
 
 struct amount_msat;
 struct amount_sat;
@@ -11,7 +12,7 @@ struct sha256;
 
 #define LEASE_RATE_DURATION 4032
 
-bool lease_rates_empty(struct lease_rates *rates);
+bool lease_rates_empty(const struct lease_rates *rates);
 
 void lease_rates_get_commitment(struct pubkey *pubkey,
 				u32 lease_expiry,
@@ -19,8 +20,13 @@ void lease_rates_get_commitment(struct pubkey *pubkey,
 				u16 chan_fee_ppt,
 				struct sha256 *sha);
 
-bool lease_rates_eq(struct lease_rates *l1,
-		    struct lease_rates *l2);
+/* lease_rates_eq: has 2 padding bytes after third field */
+STRUCTEQ_DEF(lease_rates, 2,
+	     funding_weight,
+	     lease_fee_basis,
+	     channel_fee_max_proportional_thousandths,
+	     lease_fee_base_sat,
+	     channel_fee_max_base_msat);
 
 bool lease_rates_calc_fee(struct lease_rates *rates,
 			  struct amount_sat accept_funding_sats,