#!/bin/sh

# $Id$
# Karsten Kruse - www.tecneeq.de
#
# free - show memory and swap usage
#
#  Copyright (c) 2003, Karsten Kruse <tecneeq(at)tecneeq.de>
#  All rights reserved.
#
#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions
#  are met:
#
#  1. Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following  disclaimer.
#  2. Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in
#     the documentation and/or other materials provided with the
#     distribution.
#  3. Neither the name of the author nor the names of its contributors
#     may be used to endorse or promote products derived from this
#     software without specific prior written permission.
#
#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
#  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
#  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
#  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
#  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
#  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
#  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
#  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
#  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
#  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

if [ ! _NetBSD = _`uname -s` ] ; then
	echo "Kid, get yerself a System at www.netbsd.org"
fi

show_kb(){
vmstat -s | awk '
/ bytes per page$/ { bpp = $1 }
/ pages managed$/ { totalmem = $1 }
/ pages free$/ { free = $1 }
/ cached file pages$/ { fcache = $1 }
/ cached executable pages$/ { ecache = $1 }
/ swap pages$/ { totalswap = $1 }
/ swap pages in use$/ { swapused = $1 }
END {
    printf("        %10s %10s %10s %10s\n","total","used","free","buffers");
    printf("Mem:    %10d %10d %10d %10d\n",totalmem * bpp / 1024,(totalmem - free) * bpp / 1024,free * bpp / 1024,(fcache + ecache) * bpp / 1024);
    printf("Swap:   %10d %10d %10d\n",totalswap * bpp / 1024,swapused * bpp / 1024,(totalswap - swapused) * bpp / 1024);
}'
}

show_mb(){
vmstat -s | awk '
/ bytes per page$/ { bpp = $1 }
/ pages managed$/ { totalmem = $1 }
/ pages free$/ { free = $1 }
/ cached file pages$/ { fcache = $1 }
/ cached executable pages$/ { ecache = $1 }
/ swap pages$/ { totalswap = $1 }
/ swap pages in use$/ { swapused = $1 }
END {
    printf("        %10s %10s %10s %10s\n","total","used","free","buffers");
    printf("Mem:    %10d %10d %10d %10d\n",totalmem * bpp / 1024 / 1024,(totalmem - free) * bpp / 1024 / 1024,free * bpp / 1024 / 1024,(fcache + ecache) * bpp / 1024 / 1024);
    printf("Swap:   %10d %10d %10d\n",totalswap * bpp / 1024 / 1024,swapused * bpp / 1024 / 1024,(totalswap - swapused) * bpp / 1024 / 1024);
}'
}

case $1 in
    -k) show_kb ; exit ;;
    -m) show_mb ; exit ;;
    -*)  echo "Usage: free [-k|-m]" ; exit 1 ;;
esac

show_kb