Attempt to write a portable-ish echo shell function

echo

echo() {
  case "${1}" in
    (-e)
      case "${2}" in
        (-n|--end) shift 2; printf -- '%b' "${*}" ;;
        (*)        shift; printf -- '%b\n' "${*}" ;;
      esac
    ;;
    (-E)
      case "${2}" in
        (-n|--end) shift 2; printf -- '%s' "${*}" ;;
        (*)        shift; printf -- '%s\n' "${*}" ;;
      esac
    ;;
    (-j)           shift; printf -- '{"%s": "%s"}\n' "${1}" "${2}" ;;
    (-n|--end)
      case "${2}" in
        (-e)       shift 2; printf -- '%b' "${*}" ;;
        (-E)       shift 2; printf -- '%s' "${*}" ;;
        (*)        shift; printf -- '%s' "${*}" ;;
      esac
    ;;
    (-en|-ne)      shift; printf -- '%b' "${*}" ;;
    (-En|-nE)      shift; printf -- '%s' "${*}" ;;
    (*)            printf -- '%s\n' "${*}" ;;
  esac
}