From ca4b07c529b75d36b940594e81f2f14f240cdc20 Mon Sep 17 00:00:00 2001
From: darosior <darosior@protonmail.com>
Date: Tue, 11 Jun 2019 10:55:45 +0200
Subject: [PATCH] json: add a helper to split a json token given a specific
 character

credits @rustyrussell
---
 common/json_helpers.c | 16 ++++++++++++++++
 common/json_helpers.h |  6 ++++++
 2 files changed, 22 insertions(+)

diff --git a/common/json_helpers.c b/common/json_helpers.c
index 20cd345ae..c99e3f1f4 100644
--- a/common/json_helpers.c
+++ b/common/json_helpers.c
@@ -75,3 +75,19 @@ bool json_to_txid(const char *buffer, const jsmntok_t *tok,
 	return bitcoin_txid_from_hex(buffer + tok->start,
 				     tok->end - tok->start, txid);
 }
+
+bool split_tok(const char *buffer, const jsmntok_t *tok,
+				char split,
+				jsmntok_t *a,
+				jsmntok_t *b)
+{
+	const char *p = memchr(buffer + tok->start, split, tok->end - tok->start);
+	if (!p)
+		return false;
+
+	*a = *b = *tok;
+	a->end = p - buffer;
+	b->start = p + 1 - buffer;
+
+	return true;
+}
diff --git a/common/json_helpers.h b/common/json_helpers.h
index 03286469d..9872af9a3 100644
--- a/common/json_helpers.h
+++ b/common/json_helpers.h
@@ -39,4 +39,10 @@ bool json_to_msat(const char *buffer, const jsmntok_t *tok,
 /* Extract a bitcoin txid from this */
 bool json_to_txid(const char *buffer, const jsmntok_t *tok,
 		  struct bitcoin_txid *txid);
+
+/* Split a json token into 2 tokens given a splitting character */
+bool split_tok(const char *buffer, const jsmntok_t *tok,
+				char split,
+				jsmntok_t *a,
+				jsmntok_t *b);
 #endif /* LIGHTNING_COMMON_JSON_HELPERS_H */