add prototype for dns_name6 (Rolf Eike Beer)

add FMT_IP4 and FMT_IP6 for consistency

dns.h

@@ -91,5 +91,6 @@ int dns_ip6_qualify(stralloc *,stralloc *,const stralloc *);
 #define DNS_IP6_ARPA 1
 void dns_name6_domain(char *,const char *,int);
 #define DNS_NAME6_DOMAIN (4*16+11)
+int dns_name6(stralloc *,const char *);
 
 #endif

ip4.h

@@ -9,6 +9,7 @@ unsigned int fmt_ip4(char *dest,const char *ip);
 #define ip4_fmt fmt_ip4
 
 #define IP4_FMT 20
+#define FMT_IP4 20
 
 extern const char ip4loopback[4]; /* = {127,0,0,1};*/
 

ip6.h

@@ -24,6 +24,7 @@ unsigned int fmt_ip6_flat(char *dest,const char *);
  */
 
 #define IP6_FMT 40
+#define FMT_IP6 40
 
 extern const char V4mappedprefix[12]; /*={0,0,0,0,0,0,0,0,0,0,0xff,0xff}; */
 extern const char V6loopback[16]; /*={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1}; */