/usr/share/cricket/lib/RPN.pm is in cricket 1.0.5-20.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | # -*- perl -*-
# Cricket: a configuration, polling and data display wrapper for RRD files
#
# Copyright (C) 1998 Jeff R. Allen and WebTV Networks, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
# a simple little RPN calculator -- implements the same operations
# that RRDTool does.
package RPN;
sub new {
my($type) = @_;
my($self) = {};
bless($self, $type);
return $self;
}
sub op {
my($self, $op) = @_;
if ($op eq '+') {
my($a) = $self->pop();
my($b) = $self->pop();
return unless (defined($a) && defined($b));
$self->push($b + $a);
} elsif ($op eq '-') {
my($a) = $self->pop();
my($b) = $self->pop();
return unless (defined($a) && defined($b));
$self->push($b - $a);
} elsif ($op eq '*') {
my($a) = $self->pop();
my($b) = $self->pop();
return unless (defined($a) && defined($b));
$self->push($b * $a);
} elsif ($op eq '/') {
my($a) = $self->pop();
my($b) = $self->pop();
return unless (defined($a) && defined($b));
if ($a != 0) {
$self->push($b / $a);
} else {
$self->push(undef);
}
} elsif ($op =~ /^LOG$/i) {
my($a) = $self->pop();
return unless (defined($a));
if ($a != 0) {
$self->push(log($a));
} else {
$self->push(undef);
}
}
}
sub pop {
my($self) = @_;
my($res) = pop(@{$self->{'stack'}});
warn("Stack underflow") if (! defined($res));
return $res;
}
sub push {
my($self, @items) = @_;
push @{$self->{'stack'}}, @items;
}
sub run {
my($self, $string) = @_;
my($item);
foreach $item (split(/,/, $string)) {
if ($item !~ /\d/ && ($item =~ /^[\+\*\/\-]/ || $item =~ /^log$/i)) {
$self->op($item);
} else {
$self->push($item);
}
}
return ($self->pop());
}
1;
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