#!/usr/local/bin/perl -Tw
# 
#   $Id: joinvals,v 1.4 2000/09/26 16:13:55 dgregor Exp $
#
# Copyright (c) 1998 Daniel J. Gregor, Jr., 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. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
# 	This product includes software developed by Daniel J. Gregor, Jr.
# 4. The name of Daniel J. Gregor, Jr. may not be used to endorse or promote
#    products derived from this software without specific prior written
#    permission.
# 
# THIS SOFTWARE IS PROVIDED BY DANIEL J. GREGOR, JR. ``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 DANIEL J. GREGOR, JR. 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.
# 

use FileHandle;

die "usage: joinvals <file1> <file2> ...\n" unless (@ARGV > 0);

while (@ARGV > 0) {
	$file = shift(@ARGV);
	defined($fh = new FileHandle ($file, "r")) ||
		die "cannot open $file: $!\n";

	$datatmp = ();

	while(<$fh>) {
		chomp();
		m/^\s*(\d+)\s+(\d+)\s*$/ ||
			die "syntax error on input line $. of $file: \"$_\"\n";
	
		$$datatmp{$1} = $2;
	}

	push(@datalist, $datatmp);

	$fh->close();

}

DATE:
foreach $i (sort(keys(%{$datalist[0]}))) {
	$total = 0;

	foreach $datachunk (@datalist) {
		if (!exists($$datachunk{$i})) {
			print "\n";
			next DATE;
		}
		$total += $$datachunk{$i};
	}

	print $i . "\t" . $total . "\n";
}