From 36670f3e1cccad579b994a29320eeb8e287803b7 Mon Sep 17 00:00:00 2001
From: tv <tv@shackspace.de>
Date: Thu, 21 May 2015 01:56:08 +0200
Subject: sh: functions -> bin/

---
 bin/netmask-to-prefix | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100755 bin/netmask-to-prefix

(limited to 'bin/netmask-to-prefix')

diff --git a/bin/netmask-to-prefix b/bin/netmask-to-prefix
new file mode 100755
index 00000000..1c4dbeb2
--- /dev/null
+++ b/bin/netmask-to-prefix
@@ -0,0 +1,12 @@
+#! /bin/sh
+set -euf
+
+netmask=$1
+
+binaryNetmask=$(echo $1 | sed 's/^/obase=2;/;s/\./;/g' | bc | tr -d \\n)
+binaryPrefix=$(echo $binaryNetmask | sed -n 's/^\(1*\)0*$/\1/p')
+if ! echo $binaryPrefix | grep -q .; then
+  echo $0: bad netmask: $netmask >&2
+  exit 4
+fi
+printf %s $binaryPrefix | tr -d 0 | wc -c
-- 
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