Question

In Writing CGI Applications with Perl, have following code to log visitors.

(my $digits = #ENV{'REMOTE_ADDR'}) =~ s/\.//g;
my $address = pack("C4", $digits);

in perldoc,

pack TEMPLATE,LIST

“C4” should be the template. What’s the actual meaning of this?

Answer 1

Please read the pack docs you mention. The template for C is:

C  An unsigned char (octet) value.

So C4 is four unsigned chars.