Re: glob quietly fails

[RichardK]

What are you expecting the first code example to do?

As it is, it creates an array of 2 strings each 129 characters long and then glob returns them. Which is working just fine for me ;)

UPDATE : Ah! your calling glob in scalar context! try a list context instead.

for my $g (glob(...) ) {
}

[remiah]

Hello RichardK.

glob fails silently as QM saids with my perl. How does this code say with your platform?

for (my $q =1; $q < 10000; $q++){
    my @x = ( 'A' x $q, 'B' x $q );
    my $glob = '{' . join(',', @x) . '}';

    my $g = join(',', glob($glob));
    if (length $g == 0){
        print "fail silently, q=$q\n";
        last;
    }
}

Mine stops saying

fail silently, q=511

perl -v

This is perl 5, version 12, subversion 2 (v5.12.2) built for i386-freebsd-thread-multi-64int

regards.

[Anonymous Monk]

UPDATE : Ah! your calling glob in scalar context! try a list context instead.

Both are supposed to work

[QM]

As remiah and Anonymous Monk have stated, I expected while and for to behave the same way, and they do for me, on Strawberry Perl v5.16.1:

#!/usr/env/perl

use strict;
use warnings;

my $q = (shift or 129); # 128 is the largest working value
my @x = ( 'A' x $q, 'B' x $q );

my $glob = '{' . join(',', @x) . '}';

while (my $g = glob($glob)) {
    print "while: $g\n"; 
}

for my $g ( glob( $glob ) ) {
    print "for: $g\n"; 
}

__EOF__
#################
# result:
#
while:
for:

Running this with a command line argument of 128 gives the expected output of 2 very long strings for while and 2 for for.