POSIX sh equivalent for Bash’s printf %q

Question

Suppose I have a #!/bin/sh script which can take a variety of positional parameters, some of which may include spaces, either/both kinds of quotes, etc. I want

Answer 1

I think this is POSIX. It works by clearing $@ after expanding it for the for loop, but only once so that we can iteratively build it back up (in reverse) using set.

flag=0
for i in "$@"; do
    [ "$flag" -eq 0 ] && shift $#
    set -- "$i" "$@"
    flag=1
done

echo "$@"   # To see that "$@" has indeed been reversed
ls "$@"

I realize reversing the arguments was just an example, but you may be able to use this trick of set -- "$arg" "$@" or set -- "$@" "$arg" in other situations.

And yes, I realize I may have just reimplemented (poorly) ormaaj's Push.