Yet another quoting question

[Steven W. Orr]

 4.0.35(1)-release (x86_64-redhat-linux-gnu)

I have a bunch of arrays, and some of the arrays' values are null or might 
contain spaces.

I wanted to write a routine to print out an array. It just takes the name of 
the array as an argument. Because some of the values of the array are null, 
when they print out, they show as two spaces between their neighboring values.

I want the arrays to be printed with surrounding double quotes and I'm having 
problems doing it. Since expert bash people are the sneakiest people in the 
world, I thought I'd try you guys. :-)

Here's my print function which does not wrap the printed values in double 
quotes:

print_array()
{
    typeset aname=$1
    typeset -i size=0
    typeset -a vals

    eval "size=\${#$aname[@]}"
    eval "vals=(\"\${$aname[@]}\")"
    echo "print_array:$aname:$size:${vals[@]}"
}

aa=(aaa bbb ccc ddd)
print_array aa
result is:
print_array:aa:4:aaa bbb ccc ddd

I want the output to say
print_array:aa:4:"aaa" "bbb" "ccc" "ddd"

Here's what I tried:
bb="${aa[@]/#/\"}"
echo "${bb[@]}"
"aaa "bbb "ccc "ddd "eee "fff

Now I want to put a double quote at the end of each value. So I try this:
 cc="${bb[@]/%/\"}"
*525 > echo "${cc[@]}"
"aaa "bbb "ccc "ddd "eee "fff"

This only put a double quote at the end of the last value.

So, having said all that:

1. How can I put a double quote at the end of each value (after having 
computed bb)?
2. Can I do it in one operation instead of having to use intermediate arrays, 
bb and cc? Is there syntax for this?
3. Is there a way of referring to the pattern part that matched?
4. Are regexes useful here?

I did try also setting extglob. This was the closest I got.
 echo "${aa[@]/*(.*)/\"${BASH_REMATCH[1]}\"}"
""aaa ""bbb ""ccc ""ddd

I'd love to see an elegant solution. :-)

TIA

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