(cast_to_sockaddr_in): New static inline function.

(isc_getipnum): Use it, to get rid of a warning.
(isc_gethostname): Ditto.
(isc_getportnum): Ditto.
(isc_getservice): Ditto.

src/libraries/libisc-new/src/isc_socket.c

@@ -89,6 +89,20 @@ char *inet_ntoa(ad)
 #endif
 
 
+/* cast a struct sockaddr to a struct sockaddr_in.  On some systems,
+   this cast produces a warning:
+
+   isc_socket.c:225: warning: cast increases required alignment of target type
+
+   The cast should be safe, tough.  This function removes the warning
+   in a safe manner. */
+
+static inline struct sockaddr_in *
+cast_to_sockaddr_in(struct sockaddr *in)
+{
+    return (void*)in;
+}
+
 
 IscAddress *
 isc_mkipaddress(struct sockaddr *addr)
@@ -176,7 +190,7 @@ char *isc_getipnum(IscAddress *ia, char *buf, int len)
     len = sizeof(hostname);
   }
   
-  addr = (struct sockaddr_in *) &ia->ip.saddr;
+  addr = cast_to_sockaddr_in(&ia->ip.saddr);
   
   strncpy(buf, inet_ntoa(addr->sin_addr), len-1);
   buf[len-1] = '\0';
@@ -203,7 +217,7 @@ char *isc_gethostname(IscAddress *ia, char *buf, int len)
     len = sizeof(hostname)-1;
   }
   
-  addr = (struct sockaddr_in *) &ia->ip.saddr;
+  addr = cast_to_sockaddr_in(&ia->ip.saddr);
   
   hp = gethostbyaddr((char*)&addr->sin_addr, sizeof(struct in_addr), AF_INET);
   if (!hp)
@@ -222,7 +236,7 @@ int isc_getportnum(IscAddress *ia)
   struct sockaddr_in *addr;
 
   
-  addr = (struct sockaddr_in *) &ia->ip.saddr;
+  addr = cast_to_sockaddr_in(&ia->ip.saddr);
 
   return ntohs(addr->sin_port);
 }
@@ -243,7 +257,7 @@ char *isc_getservice(IscAddress *ia,
     len = sizeof(servbuf)-1;
   }
   
-  addr = (struct sockaddr_in *) &ia->ip.saddr;
+  addr = cast_to_sockaddr_in(&ia->ip.saddr);
   
   switch (type)
   {