#compdef ifup ifdown

local expl list intf sep
local -a disp

case $OSTYPE in
  aix*)
    intf=( ${(f)"$(lsdev -C -c if -F 'name:description')"} )
    if zstyle -T ":completion:${curcontext}" verbose; then
      zstyle -s ":completion:${curcontext}:" list-separator sep || sep=--
      zformat -a list " $sep " "$intf[@]"
      disp=(-ld list)
    fi
  ;;
  darwin*|freebsd*|dragonfly*) intf=( $(ifconfig -l) ) ;;
  irix*) intf=( ${${${(f)"$(/usr/etc/netstat -i)"}%% *}[2,-1]} ) ;;
  linux*) intf=( /proc/sys/net/ipv4/conf/*~*(all|default)(N:t) ) ;;
  *) intf=( $(ifconfig -a|sed -n 's/^\([^ 	:]*\).*/\1/p') ) ;;
esac

_wanted interfaces expl 'network interface' \
    compadd "$@" "$disp[@]" - "${(@)intf%%:*}"