From 32713b4379e9ce7857e3de036b3c7fc252d87050 Mon Sep 17 00:00:00 2001
From: Christian Decker <decker.christian@gmail.com>
Date: Thu, 7 Feb 2019 16:14:01 +0100
Subject: [PATCH] json: Add utility to add a null-member

Signed-off-by: Christian Decker <decker.christian@gmail.com>
---
 lightningd/json.c                           | 5 +++++
 lightningd/json.h                           | 4 ++++
 lightningd/test/run-invoice-select-inchan.c | 3 +++
 wallet/test/run-wallet.c                    | 3 +++
 4 files changed, 15 insertions(+)

diff --git a/lightningd/json.c b/lightningd/json.c
index e43635482..a6be0ee9f 100644
--- a/lightningd/json.c
+++ b/lightningd/json.c
@@ -299,6 +299,11 @@ void json_add_bool(struct json_stream *result, const char *fieldname, bool value
 	json_add_member(result, fieldname, value ? "true" : "false");
 }
 
+void json_add_null(struct json_stream *stream, const char *fieldname)
+{
+	json_add_member(stream, fieldname, "null");
+}
+
 void json_add_hex(struct json_stream *result, const char *fieldname,
 		  const void *data, size_t len)
 {
diff --git a/lightningd/json.h b/lightningd/json.h
index baba115da..005456d43 100644
--- a/lightningd/json.h
+++ b/lightningd/json.h
@@ -115,6 +115,10 @@ void json_add_u64(struct json_stream *result, const char *fieldname,
 /* '"fieldname" : true|false' or 'true|false' if fieldname is NULL */
 void json_add_bool(struct json_stream *result, const char *fieldname,
 		   bool value);
+
+/* '"fieldname" : null' or 'null' if fieldname is NULL */
+void json_add_null(struct json_stream *stream, const char *fieldname);
+
 /* '"fieldname" : "0189abcdef..."' or "0189abcdef..." if fieldname is NULL */
 void json_add_hex(struct json_stream *result, const char *fieldname,
 		  const void *data, size_t len);
diff --git a/lightningd/test/run-invoice-select-inchan.c b/lightningd/test/run-invoice-select-inchan.c
index 7f48644ee..b40608e11 100644
--- a/lightningd/test/run-invoice-select-inchan.c
+++ b/lightningd/test/run-invoice-select-inchan.c
@@ -142,6 +142,9 @@ void json_add_hex_talarr(struct json_stream *result UNNEEDED,
 void json_add_log(struct json_stream *result UNNEEDED,
 		  const struct log_book *lr UNNEEDED, enum log_level minlevel UNNEEDED)
 { fprintf(stderr, "json_add_log called!\n"); abort(); }
+/* Generated stub for json_add_null */
+void json_add_null(struct json_stream *stream UNNEEDED, const char *fieldname UNNEEDED)
+{ fprintf(stderr, "json_add_null called!\n"); abort(); }
 /* Generated stub for json_add_num */
 void json_add_num(struct json_stream *result UNNEEDED, const char *fieldname UNNEEDED,
 		  unsigned int value UNNEEDED)
diff --git a/wallet/test/run-wallet.c b/wallet/test/run-wallet.c
index 5fec97b24..596dedb73 100644
--- a/wallet/test/run-wallet.c
+++ b/wallet/test/run-wallet.c
@@ -215,6 +215,9 @@ void json_add_hex_talarr(struct json_stream *result UNNEEDED,
 void json_add_log(struct json_stream *result UNNEEDED,
 		  const struct log_book *lr UNNEEDED, enum log_level minlevel UNNEEDED)
 { fprintf(stderr, "json_add_log called!\n"); abort(); }
+/* Generated stub for json_add_null */
+void json_add_null(struct json_stream *stream UNNEEDED, const char *fieldname UNNEEDED)
+{ fprintf(stderr, "json_add_null called!\n"); abort(); }
 /* Generated stub for json_add_num */
 void json_add_num(struct json_stream *result UNNEEDED, const char *fieldname UNNEEDED,
 		  unsigned int value UNNEEDED)