source: vendor/bash/3.1-p17/examples/functions/fstty

#
# A function that works as a front end for both stty and the `bind'
# builtin, so the tty driver and readline see the same changes
#

#
# Convert between the stty ^H control character form and the readline \C-H
# form
#
cvt()
{
        echo "$@" | cat -v | sed 's/\^/\\C-/'
}

#
# stty front-end.  Parses the argument list and creates two command strings,
# one for stty, another for bind.
#
fstty()
{
        local   cmd="" bargs=""
        local   e

        while [ $# -gt 0 ]
        do
                case "$1" in
                -a)     cmd="$cmd everything"
                        ;;
                erase)  shift;
                        e=$(cvt "$1")
                        cmd="$cmd erase $1"
                        bargs="$bargs '\"$e\": backward-delete-char'"
                        ;;
                kill)   shift
                        e=$(cvt "$1")
                        cmd="$cmd kill $1"
                        bargs="$bargs '\"$e\": unix-line-discard'"
                        ;;
                werase) shift;
                        e=$(cvt "$1")
                        cmd="$cmd erase $1"
                        bargs="$bargs '\"$e\": backward-kill-word'"
                        ;;
                lnext)  shift;
                        e=$(cvt "$1")
                        cmd="$cmd erase $1"
                        bargs="$bargs '\"$e\": quoted-insert'"
                        ;;
                *)      cmd="$cmd $1"
                        ;;
                esac
                shift
        done

        command stty $cmd
        if [ -n "$bargs" ]; then
                builtin bind $bargs
        fi
}