From 4ece097eedaca652049e485f08009cfde8aa43c9 Mon Sep 17 00:00:00 2001
From: darosior <darosior@protonmail.com>
Date: Thu, 28 Nov 2019 15:10:08 +0100
Subject: [PATCH] bitcoin/chainparams: add an utility to retrieve chainparams
 for all networks

---
 bitcoin/chainparams.c | 9 +++++++++
 bitcoin/chainparams.h | 6 ++++++
 2 files changed, 15 insertions(+)

diff --git a/bitcoin/chainparams.c b/bitcoin/chainparams.c
index 39e689fb990c..6147524d3adf 100644
--- a/bitcoin/chainparams.c
+++ b/bitcoin/chainparams.c
@@ -1,6 +1,7 @@
 #include "chainparams.h"
 #include <ccan/array_size/array_size.h>
 #include <ccan/str/str.h>
+#include <common/utils.h>
 #include <string.h>
 
 /* Version codes for BIP32 extended keys in libwally-core.
@@ -220,6 +221,14 @@ const struct chainparams *chainparams_for_network(const char *network_name)
 	return NULL;
 }
 
+const struct chainparams **chainparams_for_networks(const tal_t *ctx)
+{
+	const struct chainparams **params = tal_arr(ctx, const struct chainparams*, 0);
+	for (size_t i = 0; i < ARRAY_SIZE(networks); i++)
+		tal_arr_expand(&params, &networks[i]);
+	return params;
+}
+
 const struct chainparams *chainparams_by_chainhash(const struct bitcoin_blkid *chain_hash)
 {
 	for (size_t i = 0; i < ARRAY_SIZE(networks); i++) {
diff --git a/bitcoin/chainparams.h b/bitcoin/chainparams.h
index 2feca23a8e36..e041a79a1f9d 100644
--- a/bitcoin/chainparams.h
+++ b/bitcoin/chainparams.h
@@ -46,6 +46,12 @@ struct chainparams {
  */
 const struct chainparams *chainparams_for_network(const char *network_name);
 
+/**
+ * chainparams_for_networks - Get blockchain parameters for all known networks,
+ *                            as a tal array.
+ */
+const struct chainparams **chainparams_for_networks(const tal_t *ctx);
+
 /**
  * chainparams_by_bip173 - Helper to get a network by its bip173 name
  *