base-files: ipcalc.sh: don't print broadcast addr for prefix > 30

Printing a broadcast address doesn't make any sense for /31 and /32
prefixes.
Strictly speaking, the same goes for the network address but it is useful
to get the first address in the prefix, e.g. to create a canonical
CIDR notation "$NETWORK/$PREFIX".

Signed-off-by: Leon M. Busch-George <leon@georgemail.eu>

diff --git a/package/base-files/files/bin/ipcalc.sh b/package/base-files/files/bin/ipcalc.sh
index c852b5163f493b25f95aea38368fe509d517736d..ffcdfc02d8b5f57cef2455a6e1932691c51158c2 100755 (executable)
--- a/package/base-files/files/bin/ipcalc.sh
+++ b/package/base-files/files/bin/ipcalc.sh
@@ -50,12 +50,14 @@ BEGIN {
 
        network=and(ipaddr,netmask)
        prefix=32-bitcount(compl32(netmask))
-       broadcast=or(network,compl32(netmask))
 
        print "IP="int2ip(ipaddr)
        print "NETMASK="int2ip(netmask)
-       print "BROADCAST="int2ip(broadcast)
        print "NETWORK="int2ip(network)
+       if (prefix<=30) {
+               broadcast=or(network,compl32(netmask))
+               print "BROADCAST="int2ip(broadcast)
+       }
        print "PREFIX="prefix
 
        # range calculations: