#!/bin/sh

iriver=/mnt
force=

while getopts 'i:d:f' opt; do
    case $opt in
	i  ) 
	    iriver="$OPTARG"
	    ;;
	d  ) 
	    iriver="$OPTARG"
	    ;;
	f  ) 
	    force="y"
	    ;;
    esac
done
shift $(($OPTIND - 1))

check ()
{
   [ -d "$1" ] ||
      { 
	 echo "iriver error: $1 doesn't exist" >&2
	 echo "iriver error: does not look like iRiver device at $iriver" >&2
	 exit 1
      }
}

[ -n "$force" ] || check "$iriver/VOICE"
[ -n "$force" ] || check "$iriver/RECORD"

if [ -z "$*" ]
then
   find . -type f -name '*.mp3' -print
else
   for d in "$@"
   do
      find "$d" -type f -name '*.mp3' -print
   done
fi |
   sort |
   tar  cf - -T - |
   {
      cd "$iriver" &&
      tar xvf -
   }