c: silence warnings

damus-c/amount.c

@@ -151,7 +151,7 @@ static bool from_numbers(u64 *res,
         return false;
 
     if (!from_number(&p1, s1, len1, tens_factor)
-        || !from_number(&p2, s2, len2, tens_factor - len2))
+        || !from_number(&p2, s2, len2, tens_factor - (int)len2))
         return false;
 
     if (add_overflows_u64(p1, p2))
@@ -453,7 +453,7 @@ bool amount_msat_to_u32(struct amount_msat msat, u32 *millisatoshis)
 {
     if (amount_msat_greater_eq(msat, AMOUNT_MSAT(0x100000000)))
         return false;
-    *millisatoshis = msat.millisatoshis;
+    *millisatoshis = (u32)msat.millisatoshis;
     return true;
 }
 

damus-c/bolt11.c

@@ -297,7 +297,7 @@ static char *decode_c(struct bolt11 *b11,
     if (!pull_uint(hu5, data, data_len, &c, data_length * 5))
         return tal_fmt(b11, "c: length %zu chars is excessive",
                    *data_len);
-    b11->min_final_cltv_expiry = c;
+    b11->min_final_cltv_expiry = (u32)c;
     /* Can overflow, since c is 64 bits but value must be < 32 bits */
     if (b11->min_final_cltv_expiry != c)
         return tal_fmt(b11, "c: %"PRIu64" is too large", c);

damus-c/hash_u5.c

@@ -30,7 +30,7 @@ void hash_u5(struct hash_u5 *hu5, const u8 *u5, size_t len)
             u5++;
 
         if (hu5->num_bits >= 32) {
-            be32 be32 = cpu_to_be32(hu5->buf >> (hu5->num_bits-32));
+            be32 be32 = cpu_to_be32((u32)(hu5->buf >> (hu5->num_bits-32)));
             sha256_update(&hu5->hash, &be32, sizeof(be32));
             hu5->num_bits -= 32;
         }
@@ -40,7 +40,7 @@ void hash_u5(struct hash_u5 *hu5, const u8 *u5, size_t len)
 void hash_u5_done(struct hash_u5 *hu5, struct sha256 *res)
 {
     if (hu5->num_bits) {
-        be32 be32 = cpu_to_be32(hu5->buf << (32 - hu5->num_bits));
+        be32 be32 = cpu_to_be32((u32)(hu5->buf << (32 - hu5->num_bits)));
 
         sha256_update(&hu5->hash, &be32, (hu5->num_bits + 7) / 8);
     }

damus-c/overflows.h

@@ -37,7 +37,7 @@ static inline bool assign_overflow_u16(u16 *dst, uint64_t v)
 
 static inline bool assign_overflow_u32(u32 *dst, uint64_t v)
 {
-    *dst = v;
+    *dst = (u32)v;
     return *dst == v;
 }
 #endif /* LIGHTNING_COMMON_OVERFLOWS_H */