amount: add amount_msat and amount_sat initializers.

Generally, importing amounts needn't be checked, and it cuts down on
the warnings we get.

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

closingd/closingd.c

@@ -540,17 +540,16 @@ adjust_offer(struct per_peer_state *pps, const struct channel_id *channel_id,
 		 * one from our previous proposal. So, if the user requested a
 		 * step of 1 satoshi at a time we should just return our end of
 		 * the range from this function. */
-		amount_msat_from_u64(&step_msat,
-				     (fee_negotiation_step - 1) * MSAT_PER_SAT);
+		step_msat = amount_msat((fee_negotiation_step - 1)
+					* MSAT_PER_SAT);
 	} else {
 		/* fee_negotiation_step is e.g. 20 to designate 20% from
 		 * range_len (which is in satoshi), so:
 		 * range_len * fee_negotiation_step / 100 [sat]
 		 * is equivalent to:
 		 * range_len * fee_negotiation_step * 10 [msat] */
-		amount_msat_from_u64(&step_msat,
-				     range_len.satoshis /* Raw: % calc */ *
-					 fee_negotiation_step * 10);
+		step_msat = amount_msat(range_len.satoshis /* Raw: % calc */ *
+					fee_negotiation_step * 10);
 	}
 
 	step_sat = amount_msat_to_sat_round_down(step_msat);

common/amount.c

@@ -401,22 +401,20 @@ bool amount_msat_to_u32(struct amount_msat msat, u32 *millisatoshis)
 	return true;
 }
 
-void amount_msat_from_u64(struct amount_msat *msat, u64 millisatoshis)
+struct amount_msat amount_msat(u64 millisatoshis)
 {
-	msat->millisatoshis = millisatoshis;
-}
+	struct amount_msat msat;
 
-void amount_sat_from_u64(struct amount_sat *sat, u64 satoshis)
-{
-	sat->satoshis = satoshis;
+	msat.millisatoshis = millisatoshis;
+	return msat;
 }
 
-WARN_UNUSED_RESULT bool amount_msat_from_sat_u64(struct amount_msat *msat, u64 satoshis)
+struct amount_sat amount_sat(u64 satoshis)
 {
-	if (mul_overflows_u64(satoshis, MSAT_PER_SAT))
-		return false;
-	msat->millisatoshis = satoshis * MSAT_PER_SAT;
-	return true;
+	struct amount_sat sat;
+
+	sat.satoshis = satoshis;
+	return sat;
 }
 
 bool amount_msat_fee(struct amount_msat *fee,

common/amount.h

@@ -47,6 +47,10 @@ struct amount_asset {
 #define AMOUNT_SAT(constant)						\
 	((struct amount_sat){(constant) + AMOUNT_MUST_BE_CONST(constant)})
 
+/* We do sometimes need to import from raw types, eg. wally or wire fmt */
+struct amount_msat amount_msat(u64 millisatoshis);
+struct amount_sat amount_sat(u64 satoshis);
+
 /* You may not always be able to convert satoshis->millisatoshis. */
 WARN_UNUSED_RESULT bool amount_sat_to_msat(struct amount_msat *msat,
 					   struct amount_sat sat);
@@ -128,11 +132,6 @@ struct amount_sat amount_asset_to_sat(struct amount_asset *asset);
 WARN_UNUSED_RESULT bool amount_msat_to_u32(struct amount_msat msat,
 					   u32 *millisatoshis);
 
-/* Programatically initialize from various types */
-void amount_msat_from_u64(struct amount_msat *msat, u64 millisatoshis);
-void amount_sat_from_u64(struct amount_sat *sat, u64 satoshis);
-WARN_UNUSED_RESULT bool amount_msat_from_sat_u64(struct amount_msat *msat, u64 satoshis);
-
 /* Common operation: what is the HTLC fee for given feerate?  Can overflow! */
 WARN_UNUSED_RESULT bool amount_msat_fee(struct amount_msat *fee,
 					struct amount_msat amt,

common/onion.c

@@ -326,7 +326,7 @@ struct onion_payload *onion_decode(const tal_t *ctx,
 		if (!tlv->amt_to_forward || !tlv->outgoing_cltv_value)
 			goto fail;
 
-		amount_msat_from_u64(&p->amt_to_forward, *tlv->amt_to_forward);
+		p->amt_to_forward = amount_msat(*tlv->amt_to_forward);
 		p->outgoing_cltv = *tlv->outgoing_cltv_value;
 
 		/* BOLT #4:

common/test/run-sphinx.c

@@ -25,12 +25,12 @@ bool amount_asset_is_main(struct amount_asset *asset UNNEEDED)
 /* Generated stub for amount_asset_to_sat */
 struct amount_sat amount_asset_to_sat(struct amount_asset *asset UNNEEDED)
 { fprintf(stderr, "amount_asset_to_sat called!\n"); abort(); }
+/* Generated stub for amount_msat */
+struct amount_msat amount_msat(u64 millisatoshis UNNEEDED)
+{ fprintf(stderr, "amount_msat called!\n"); abort(); }
 /* Generated stub for amount_msat_eq */
 bool amount_msat_eq(struct amount_msat a UNNEEDED, struct amount_msat b UNNEEDED)
 { fprintf(stderr, "amount_msat_eq called!\n"); abort(); }
-/* Generated stub for amount_msat_from_u64 */
-void amount_msat_from_u64(struct amount_msat *msat UNNEEDED, u64 millisatoshis UNNEEDED)
-{ fprintf(stderr, "amount_msat_from_u64 called!\n"); abort(); }
 /* Generated stub for amount_sat_add */
  bool amount_sat_add(struct amount_sat *val UNNEEDED,
 				       struct amount_sat a UNNEEDED,

gossipd/test/run-bench-find_route.c

@@ -82,9 +82,6 @@ bool nannounce_different(struct gossip_store *gs UNNEEDED,
 /* Generated stub for notleak_ */
 void *notleak_(const void *ptr UNNEEDED, bool plus_children UNNEEDED)
 { fprintf(stderr, "notleak_ called!\n"); abort(); }
-/* Generated stub for onion_type_name */
-const char *onion_type_name(int e UNNEEDED)
-{ fprintf(stderr, "onion_type_name called!\n"); abort(); }
 /* Generated stub for peer_supplied_good_gossip */
 void peer_supplied_good_gossip(struct peer *peer UNNEEDED, size_t amount UNNEEDED)
 { fprintf(stderr, "peer_supplied_good_gossip called!\n"); abort(); }

gossipd/test/run-check_channel_announcement.c

@@ -118,9 +118,6 @@ struct oneshot *new_reltimer_(struct timers *timers UNNEEDED,
 /* Generated stub for notleak_ */
 void *notleak_(const void *ptr UNNEEDED, bool plus_children UNNEEDED)
 { fprintf(stderr, "notleak_ called!\n"); abort(); }
-/* Generated stub for onion_type_name */
-const char *onion_type_name(int e UNNEEDED)
-{ fprintf(stderr, "onion_type_name called!\n"); abort(); }
 /* Generated stub for peer_supplied_good_gossip */
 void peer_supplied_good_gossip(struct peer *peer UNNEEDED, size_t amount UNNEEDED)
 { fprintf(stderr, "peer_supplied_good_gossip called!\n"); abort(); }

gossipd/test/run-find_route-specific.c

@@ -69,9 +69,6 @@ bool nannounce_different(struct gossip_store *gs UNNEEDED,
 /* Generated stub for notleak_ */
 void *notleak_(const void *ptr UNNEEDED, bool plus_children UNNEEDED)
 { fprintf(stderr, "notleak_ called!\n"); abort(); }
-/* Generated stub for onion_type_name */
-const char *onion_type_name(int e UNNEEDED)
-{ fprintf(stderr, "onion_type_name called!\n"); abort(); }
 /* Generated stub for peer_supplied_good_gossip */
 void peer_supplied_good_gossip(struct peer *peer UNNEEDED, size_t amount UNNEEDED)
 { fprintf(stderr, "peer_supplied_good_gossip called!\n"); abort(); }

gossipd/test/run-find_route.c

@@ -69,9 +69,6 @@ bool nannounce_different(struct gossip_store *gs UNNEEDED,
 /* Generated stub for notleak_ */
 void *notleak_(const void *ptr UNNEEDED, bool plus_children UNNEEDED)
 { fprintf(stderr, "notleak_ called!\n"); abort(); }
-/* Generated stub for onion_type_name */
-const char *onion_type_name(int e UNNEEDED)
-{ fprintf(stderr, "onion_type_name called!\n"); abort(); }
 /* Generated stub for peer_supplied_good_gossip */
 void peer_supplied_good_gossip(struct peer *peer UNNEEDED, size_t amount UNNEEDED)
 { fprintf(stderr, "peer_supplied_good_gossip called!\n"); abort(); }

gossipd/test/run-overlong.c

@@ -69,9 +69,6 @@ bool nannounce_different(struct gossip_store *gs UNNEEDED,
 /* Generated stub for notleak_ */
 void *notleak_(const void *ptr UNNEEDED, bool plus_children UNNEEDED)
 { fprintf(stderr, "notleak_ called!\n"); abort(); }
-/* Generated stub for onion_type_name */
-const char *onion_type_name(int e UNNEEDED)
-{ fprintf(stderr, "onion_type_name called!\n"); abort(); }
 /* Generated stub for peer_supplied_good_gossip */
 void peer_supplied_good_gossip(struct peer *peer UNNEEDED, size_t amount UNNEEDED)
 { fprintf(stderr, "peer_supplied_good_gossip called!\n"); abort(); }

gossipd/test/run-txout_failure.c

@@ -79,9 +79,6 @@ bool nannounce_different(struct gossip_store *gs UNNEEDED,
 /* Generated stub for notleak_ */
 void *notleak_(const void *ptr UNNEEDED, bool plus_children UNNEEDED)
 { fprintf(stderr, "notleak_ called!\n"); abort(); }
-/* Generated stub for onion_type_name */
-const char *onion_type_name(int e UNNEEDED)
-{ fprintf(stderr, "onion_type_name called!\n"); abort(); }
 /* Generated stub for peer_supplied_good_gossip */
 void peer_supplied_good_gossip(struct peer *peer UNNEEDED, size_t amount UNNEEDED)
 { fprintf(stderr, "peer_supplied_good_gossip called!\n"); abort(); }

lightningd/opening_control.c

@@ -705,8 +705,8 @@ static void channel_config(struct lightningd *ld,
 	*max_to_self_delay = ld->config.locktime_max;
 
 	/* Take minimal effective capacity from config min_capacity_sat */
-	if (!amount_msat_from_sat_u64(min_effective_htlc_capacity,
-				ld->config.min_capacity_sat))
+	if (!amount_sat_to_msat(min_effective_htlc_capacity,
+				amount_sat(ld->config.min_capacity_sat)))
 		fatal("amount_msat overflow for config.min_capacity_sat");
 	/* Substract 2 * dust_limit, so fundchannel with min value is possible */
 	if (!amount_sat_to_msat(&dust_limit, chainparams->dust_limit))

lightningd/test/run-find_my_abspath.c

@@ -11,10 +11,6 @@ int unused_main(int argc, char *argv[]);
 /* Generated stub for activate_peers */
 void activate_peers(struct lightningd *ld UNNEEDED)
 { fprintf(stderr, "activate_peers called!\n"); abort(); }
-/* Generated stub for add_plugin_dir */
-char *add_plugin_dir(struct plugins *plugins UNNEEDED, const char *dir UNNEEDED,
-		     bool error_ok UNNEEDED)
-{ fprintf(stderr, "add_plugin_dir called!\n"); abort(); }
 /* Generated stub for begin_topology */
 void begin_topology(struct chain_topology *topo UNNEEDED)
 { fprintf(stderr, "begin_topology called!\n"); abort(); }
@@ -207,6 +203,7 @@ void plugins_init(struct plugins *plugins UNNEEDED)
 struct plugins *plugins_new(const tal_t *ctx UNNEEDED, struct log_book *log_book UNNEEDED,
 			    struct lightningd *ld UNNEEDED)
 { fprintf(stderr, "plugins_new called!\n"); abort(); }
+/* Generated stub for plugins_set_builtin_plugins_dir */
 void plugins_set_builtin_plugins_dir(struct plugins *plugins UNNEEDED,
 				     const char *dir UNNEEDED)
 { fprintf(stderr, "plugins_set_builtin_plugins_dir called!\n"); abort(); }