From: Jo-Philipp Wich <jow@openwrt.org>
Date: Sun, 23 Dec 2012 22:18:43 +0000 (+0000)
Subject: base-files: ipcalc.sh: fix broken calculations on 64bit systems
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=ab6e2e69287c606f4459c558becc26cea1cabbfc;p=openwrt%2Fstaging%2Fblocktrron.git

base-files: ipcalc.sh: fix broken calculations on 64bit systems

Calculate complements by using awk's xor() function with a mask of 0xffffffff
instead of relying on the compl() function which appears to produce broken
results on certain 64bit architectures.

SVN-Revision: 34875
---

diff --git a/package/base-files/files/bin/ipcalc.sh b/package/base-files/files/bin/ipcalc.sh
index d6ef168706..7463d6bdda 100755
--- a/package/base-files/files/bin/ipcalc.sh
+++ b/package/base-files/files/bin/ipcalc.sh
@@ -22,6 +22,11 @@ function int2ip(ip,ret,x) {
 	return ret
 }
 
+function compl32(v) {
+	ret=xor(v, 0xffffffff)
+	return ret
+}
+
 BEGIN {
 	slpos=index(ARGV[1],"/")
 	if (slpos == 0) {
@@ -29,27 +34,27 @@ BEGIN {
 		netmask=ip2int(ARGV[2])
 	} else {
 		ipaddr=ip2int(substr(ARGV[1],0,slpos-1))
-		netmask=compl(2**(32-int(substr(ARGV[1],slpos+1)))-1)
+		netmask=compl32(2**(32-int(substr(ARGV[1],slpos+1)))-1)
 		ARGV[4]=ARGV[3]
 		ARGV[3]=ARGV[2]
 	}
 
 	network=and(ipaddr,netmask)
-	broadcast=or(network,compl(netmask))
+	broadcast=or(network,compl32(netmask))
 
-	start=or(network,and(ip2int(ARGV[3]),compl(netmask)))
+	start=or(network,and(ip2int(ARGV[3]),compl32(netmask)))
 	limit=network+1
 	if (start<limit) start=limit
 
 	end=start+ARGV[4]
-	limit=or(network,compl(netmask))-1
+	limit=or(network,compl32(netmask))-1
 	if (end>limit) end=limit
 
 	print "IP="int2ip(ipaddr)
 	print "NETMASK="int2ip(netmask)
 	print "BROADCAST="int2ip(broadcast)
 	print "NETWORK="int2ip(network)
-	print "PREFIX="32-bitcount(compl(netmask))
+	print "PREFIX="32-bitcount(compl32(netmask))
 
 	# range calculations:
 	# ipcalc <ip> <netmask> <start> <num>