package/base-files/default/etc/functions.sh

   1 #!/bin/sh
   2 . /etc/nvram.sh
   3
   4 alias debug=${DEBUG:-:}
   5
   6 # valid interface?
   7 if_valid () (
   8   ifconfig "$1" >&- 2>&- ||
   9   [ "${1%%[0-9]}" = "br" ] ||
  10   { debug "# missing interface '$1' ignored"; false; }
  11 )
  12
  13 hotplug_dev() {
  14         env -i ACTION=$1 INTERFACE=$2 /sbin/hotplug net
  15 }
  16
  17 bitcount () {
  18   local c=$1
  19   echo $((
  20   c=((c>> 1)&0x55555555)+(c&0x55555555),
  21   c=((c>> 2)&0x33333333)+(c&0x33333333),
  22   c=((c>> 4)&0x0f0f0f0f)+(c&0x0f0f0f0f),
  23   c=((c>> 8)&0x00ff00ff)+(c&0x00ff00ff),
  24   c=((c>>16)&0x0000ffff)+(c&0x0000ffff)
  25   ))
  26 }
  27
  28 valid_netmask () {
  29   return $((-($1)&~$1))
  30 }
  31
  32 ip2int () (
  33   set $(echo $1 | tr '\.' ' ')
  34   echo $(($1<<24|$2<<16|$3<<8|$4))
  35 )
  36
  37 int2ip () {
  38   echo $(($1>>24&255)).$(($1>>16&255)).$(($1>>8&255)).$(($1&255))
  39 }