pass verbatim arguments to getopts without $@ or $* inside posix shell script

Question

I'm trying to pass an argument as "verbatim" to my script, the problem is that the argument in inside double quotes "" and it starts with a double dash/double hyphen --.

This is an example

script.sh -f "--conf=bla"

In my script both $* and $@ transform this into

-f --conf=bla

and when this thing reaches getopts there is no way to decode this information the way it should be.

And by the way this is my getopts

foo()
{
    while getopts ":f:" vars
    do
            case ${vars} in 
                    f ) MYVAR=${OPTARG};;  
                    * ) Err; exit 1;;
            esac
    done
    shift $((OPTIND-1))
}

I would like to store --conf=bla inside MYVAR, I can't find a way to do this, apparently I can't control the way the double quotes are stripped away and, in general, I can't really pass text as verbatim to my script.

How I can control this ?

Answer 1

$ cat t.sh
#!/bin/sh

foo()
{
        # unset OPTIND
        while getopts ":f:" vars
        do
                case ${vars} in
                        f) MYVAR=${OPTARG} ;;
                        *) echo "error"; exit 1 ;;
                esac
        done
        shift $((OPTIND-1))

        echo "\$MYVAR=[${MYVAR}]"
}

foo "$@"

.

$ ./t.sh -f "--conf=blah"
$MYVAR=[--conf=blah]

Please elaborate?