#!/usr/bin/perl -w
# -*- Mode: Perl; tab-width: 4; indent-tabs-mode: nil; -*-
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is Mozilla Automated Testing Code.
#
# The Initial Developer of the Original Code is
# Mozilla Corporation.
# Portions created by the Initial Developer are Copyright (C) 2008
# the Initial Developer. All Rights Reserved.
#
# Contributor(s): Bob Clary <bob@bclary.com>
#
# Alternatively, the contents of this file may be used under the terms of
# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
#
# ***** END LICENSE BLOCK *****

my $K = 1024;
my $M = 1024 * $K;
my $G = 1024 * $M;

my $tmpmemory;
my $unitmemory;
my $raw_memory = 0;
my $swap_memory = 0;
my $ulimit_maxmemory = 0;
my $ulimit_virtualmemory = 0;
my $test_memory = 0;

# hack around lack of available environment entries in both
# cygwin perl and redhat perl
open OSTYPE, "set | grep OSTYPE |" || die "Unable to open OSTYPE: $!";
while (<OSTYPE>)
{
    chomp;
    $ostype .= $_;
}
close OSTYPE;

die "Unable to determine OSTYPE" if (!$ostype);

if ($ostype =~ /linux/i || $ostype =~ /cygwin/i)
{
    open MEMINFO, "/proc/meminfo" or die "Unable to open /proc/meminfo";
    while (<MEMINFO>)
    {
        if ( ($tmpmemory, $unitmemory) = $_ =~ /MemTotal:\s*([0-9]*) (kB)/)
        {
            die "Unknown memory unit meminfo MemTotal $unitmemory" if $unitmemory ne "kB";

            $tmpmemory *= 1024;
            $raw_memory = int($tmpmemory / $G + .5);
        }
        elsif ( ($tmpmemory, $unitmemory) = $_ =~ /SwapTotal:\s*([0-9]*) (kB)/)
        {
            die "Unknown memory unit meminfo SwapTotal $unitmemory" if $unitmemory ne "kB";

            $tmpmemory *= 1024;
            $swap_memory = int($tmpmemory / $G + .5);
        }
    }
    close MEMINFO;
}
elsif ($ostype =~ /darwin/i)
{
    open SYSTEMPROFILER, "system_profiler|" or die "Unable to open system_profiler";
    while (<SYSTEMPROFILER>)
    {
        if (  ($tmpmemory, $unitmemory) = $_ =~ /\s*Memory:\s*([0-9]*) ([a-zA-Z]*)/)
        {
            if ($unitmemory =~ /KB/)
            {
                $tmpmemory *= $K;
            }
            elsif ($unitmemory =~ /MB/)
            {
                $tmpmemory *= $M;
            }
            elsif ($unitmemory =~ /GB/)
            {
                $tmpmemory *= $G;
            }
            else
            {
                die "Unknown memory unit system_profiler $unitmemory";
            }
            $raw_memory = int($tmpmemory / $G + .5);
        }
    }
    close SYSTEMPROFILER;
}
else
{
    die "Unknown Operating System: $ostype";
}

open ULIMIT, 'bash -c "ulimit -a"|' or die "Unable to open ulimit -a";

while (<ULIMIT>)
{
    if (  ($unitmemory, $tmpmemory) = $_ =~ /max memory size + \(([a-zA-Z]*), \-m\) ([0-9]*)/)
    {
        if ($tmpmemory eq "")
        {
            $tmpmemory = 0;
        }

        if ($unitmemory =~ /kbytes/i)
        {
            $tmpmemory *= $K;
        }
        elsif ($unitmemory =~ /mbytes/i)
        {
            $tmpmemory *= $M;
        }
        elsif ($unitmemory =~ /gbytes/i)
        {
            $tmpmemory *= $G;
        }
        else
        {
            die "Unknown memory unit ulimit $unitmemory";
        }

        $ulimit_maxmemory = int($tmpmemory / $G + .5);
    }
    elsif (  ($unitmemory, $tmpmemory) = $_ =~ /virtual memory + \(([a-zA-Z]*), \-v\) ([0-9]*)/)
    {
        if ($tmpmemory eq "")
        {
            $tmpmemory = 0;
        }

        if ($unitmemory =~ /kbytes/i)
        {
            $tmpmemory *= $K;
        }
        elsif ($unitmemory =~ /mbytes/i)
        {
            $tmpmemory *= $M;
        }
        elsif ($unitmemory =~ /gbytes/i)
        {
            $tmpmemory *= $G;
        }
        else
        {
            die "Unknown virtual memory unit ulimit $unitmemory";
        }

        $ulimit_virtualmemory = int($tmpmemory / $G + .5);
    }
}
close ULIMIT;

$test_memory = $ulimit_virtualmemory > 0 ? $ulimit_virtualmemory : ($raw_memory + $swap_memory);

print "$test_memory";