dec2ip

#!/usr/bin/env bash
#set -o xtrace
source harden.sh

function dectoip {
  echo "$1" | awk {'print rshift(and($1, 0xFF000000), 24) "." rshift(and($1,0x00FF0000), 16) "." rshift(and($1, 0x0000FF00), 8) "." and($1, 0x000000FF) '}
}
function hextoip {
  dectoip "$(($1))"
}
NAME=$(basename $0)

case "$NAME" in
dec2ip)
  FUNC="dectoip"
  PREVAL=""
  HELP="decimal number"
  ;;
hex2ip)
  FUNC="hextoip"
  PREVAL="0x"
  HELP="hexadecimal number"
  ;;
*)
  echo "I don't answer to the name $NAME" > /dev/stderr
  exit 1;
  ;;
esac

if [ $# -eq 0 ]; then
  while read VAL;
    do $FUNC "$PREVAL$VAL"
  done < /dev/stdin
else
  if [[ "$1" != "-h" && "$1" != "--help" ]]; then
    for VAL in "$@"
      do $FUNC "$PREVAL$VAL"
    done
  else
    
    echo "Usage: $NAME <$HELP> [<$HELP>...]"
    echo "  or : <source of ${HELP}s> | $NAME"
  fi
fi;