The documentation for glob() has:

"If non-empty braces are the only wildcard characters used in the glob, no filenames are matched, ..."

In "perlsec: Taint mode", the long list of examples has (near the end):

@files = <*.c>;             # insecure (uses readdir() or similar)
@files = glob('*.c');       # insecure (uses readdir() or similar)

# In either case, the results of glob are tainted, since the list of
# filenames comes from outside of the program.
[download]

I'm an extremely infrequent user of glob(); however, I thought it could be useful in a test I was writing yesterday. The code looked something like this:

#!perl -T

use 5.032;
use warnings;
...
my @prefixes = qw{...};
my @suffixes = glob '{,x}{,y}{,z}';
...
for my $prefix (@prefixes) {
    for my $suffix (@suffixes) {
        my $name = join '_', $prefix, split //, $suffix;
        # run is(...) test with $name here
    }
}
[download]

I got a "tainted" message. This code fixed it:

        my $tainted_name = join '_', $prefix, split //, $suffix;
        $tainted_name =~ /^(.+)$/;
        my $name = $1;
        # run is(...) test with $name here
[download]

I'm wondering if not tainting the values returned by a non-filename glob() would be a useful enhancement to Perl. I throw this open for discussion.

---

---

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! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, 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, summary, 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:
	&		&
	<		&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.