common: json_to_msat and json_to_sat helpers.

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

common/json_helpers.c

@@ -1,5 +1,6 @@
 #include <bitcoin/pubkey.h>
 #include <bitcoin/short_channel_id.h>
+#include <common/amount.h>
 #include <common/json_helpers.h>
 #include <errno.h>
 
@@ -38,6 +39,19 @@ bool json_to_pubkey(const char *buffer, const jsmntok_t *tok,
 				  tok->end - tok->start, pubkey);
 }
 
+bool json_to_msat(const char *buffer, const jsmntok_t *tok,
+		  struct amount_msat *msat)
+{
+	return parse_amount_msat(msat,
+				 buffer + tok->start, tok->end - tok->start);
+}
+
+bool json_to_sat(const char *buffer, const jsmntok_t *tok,
+		 struct amount_sat *sat)
+{
+	return parse_amount_sat(sat, buffer + tok->start, tok->end - tok->start);
+}
+
 bool json_to_short_channel_id(const char *buffer, const jsmntok_t *tok,
 			      struct short_channel_id *scid,
 			      bool may_be_deprecated_form)

common/json_helpers.h

@@ -4,6 +4,8 @@
 #include "config.h"
 #include <common/json.h>
 
+struct amount_msat;
+struct amount_sat;
 struct pubkey;
 struct short_channel_id;
 
@@ -20,4 +22,12 @@ bool json_to_short_channel_id(const char *buffer, const jsmntok_t *tok,
 			      struct short_channel_id *scid,
 			      bool may_be_deprecated_form);
 
+/* Extract a satoshis amount from this */
+bool json_to_sat(const char *buffer, const jsmntok_t *tok,
+		 struct amount_sat *sat);
+
+/* Extract a millisatoshis amount from this */
+bool json_to_msat(const char *buffer, const jsmntok_t *tok,
+		  struct amount_msat *msat);
+
 #endif /* LIGHTNING_COMMON_JSON_HELPERS_H */

common/test/run-json.c

@@ -5,6 +5,12 @@
 #include <stdio.h>
 
 /* AUTOGENERATED MOCKS START */
+/* Generated stub for parse_amount_msat */
+bool parse_amount_msat(struct amount_msat *msat UNNEEDED, const char *s UNNEEDED, size_t slen UNNEEDED)
+{ fprintf(stderr, "parse_amount_msat called!\n"); abort(); }
+/* Generated stub for parse_amount_sat */
+bool parse_amount_sat(struct amount_sat *sat UNNEEDED, const char *s UNNEEDED, size_t slen UNNEEDED)
+{ fprintf(stderr, "parse_amount_sat called!\n"); abort(); }
 /* AUTOGENERATED MOCKS END */