Why bother with a function and an anonymous function and all those nasty indices? 
use strict;
my @chr = map chr, 33..126;

my @stack;
my $fresh;

while (1) {
    if (not @stack) {
        $fresh++;
    }
    else {
        shift @{$stack[-1]};
        if (not @{$stack[-1]}) {
            pop @stack;
            $fresh++;
            redo;
        }
    }

    push @stack, map [@chr], 1..$fresh;
    $fresh = 0;

    print map $_->[0], @stack;
    print "\n";
}

[download]
Update: Fixed off by one bug that BrowserUk noticed.

In reply to Re^2: secret code generator by tilly
in thread secret code generator by xiaoyafeng

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.