#! /usr/bin/perl

my @args=@ARGV;

my %configvalues;

my @configoptions;

my $configcounter = 0;

# optionally print out the architecture as the first line of our output

my $arch = $args[2];

if (defined $arch) {

	print "# $arch\n";

}

# first, read the override file

open (FILE,"$args[0]") || die "Could not open $args[0]";

while (<FILE>) {

	my $str = $_;

	my $configname;

	if (/\# ([\w]+) is not set/) {

		$configname = $1;

	} elsif (/^\#/) {

		# fall through on comments like 'avoid CONFIG_FOO=y'

		;

	} elsif (/([\w]+)=/) {

		$configname = $1;

	}

	if (defined($configname) && !exists($configvalues{$configname})) {

		$configvalues{$configname} = $str;

		$configoptions[$configcounter] = $configname;

		$configcounter ++;

	}

};

# now, read and output the entire configfile, except for the overridden

# parts... for those the new value is printed.

open (FILE2,"$args[1]") || die "Could not open $args[1]";

while (<FILE2>) {

	my $configname;

	if (/\# ([\w]+) is not set/) {

		$configname = $1;

	} elsif (/^\#/) {

		# fall through on comments like 'avoid CONFIG_FOO=y'

		;

	} elsif (/([\w]+)=/) {

		$configname  = $1;

	}

	if (defined($configname) && exists($configvalues{$configname})) {

		print "$configvalues{$configname}";

		delete($configvalues{$configname});

	} else {

		print "$_";

	}

}

# now print the new values from the overridden configfile

my $counter = 0;

while ($counter < $configcounter) {

	my $configname = $configoptions[$counter];

	if (exists($configvalues{$configname})) {

		print "$configvalues{$configname}";

	}

	$counter++;

}

1;