ip2cidr Small and simple program for converting a netmask into a CIDR
	git clone https://noxz.tech/git/ip2cidr.git
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commit: 04797a0345407eb4a954dbcf637bd0e7f3a0af2d
parent: 33eb256fea09d4113b6b9dffa2752b6abf997324
author: z0noxz <chris@noxz.tech>
date:   Tue, 7 Aug 2018 08:31:33 +0200

handle "empty" ip addresses

diff --git a/ip2cidr b/ip2cidr
@@ -40,6 +40,10 @@ do_ip2cidr() {
     result=0
     i=0
 
+    if [ "$ip" = "" ]; then
+        return 1
+    fi
+
     IFS=\.
     for item in $ip; do
         if [ "$item" -eq "$item" ] 2> /dev/null && \