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-rwxr-xr-xscripts/config.pl142
1 files changed, 142 insertions, 0 deletions
diff --git a/scripts/config.pl b/scripts/config.pl
new file mode 100755
index 0000000..a452537
--- /dev/null
+++ b/scripts/config.pl
@@ -0,0 +1,142 @@
+#!/usr/bin/env perl
+#
+# Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+use warnings;
+use strict;
+
+my @arg = @ARGV;
+
+sub load_config($) {
+ my $file = shift;
+ my %config;
+
+ open FILE, "$file" or die "can't open file";
+ while (<FILE>) {
+ chomp;
+ /^CONFIG_(.+)=(.+)/ and do {
+ $config{$1} = $2;
+ next;
+ };
+ /^# CONFIG_(.+) is not set/ and do {
+ $config{$1} = -1;
+ next;
+ };
+ /^#/ and next;
+ /^(.+)$/ and print "WARNING: can't parse line: $1\n";
+ }
+ return \%config;
+}
+
+
+sub config_and($$) {
+ my $cfg1 = shift;
+ my $cfg2 = shift;
+ my %config;
+
+ foreach my $config (keys %$cfg1) {
+ my $val1 = $cfg1->{$config};
+ my $val2 = $cfg2->{$config};
+ $val2 and ($val1 eq $val2) and do {
+ $config{$config} = $val1;
+ };
+ }
+ return \%config;
+}
+
+
+sub config_add($$) {
+ my $cfg1 = shift;
+ my $cfg2 = shift;
+ my %config;
+
+ for ($cfg1, $cfg2) {
+ my %cfg = %$_;
+
+ foreach my $config (keys %cfg) {
+ $config{$config} = $cfg{$config};
+ }
+ }
+ return \%config;
+}
+
+sub config_diff($$) {
+ my $cfg1 = shift;
+ my $cfg2 = shift;
+ my %config;
+
+ foreach my $config (keys %$cfg2) {
+ if (!$cfg1->{$config} or $cfg1->{$config} ne $cfg2->{$config}) {
+ $config{$config} = $cfg2->{$config};
+ }
+ }
+ return \%config
+}
+
+sub config_sub($$) {
+ my $cfg1 = shift;
+ my $cfg2 = shift;
+ my %config = %{$cfg1};
+
+ foreach my $config (keys %$cfg2) {
+ delete $config{$config};
+ }
+ return \%config;
+}
+
+sub print_cfgline($$) {
+ my $name = shift;
+ my $val = shift;
+ if ($val eq '-1') {
+ print "# CONFIG_$name is not set\n";
+ } else {
+ print "CONFIG_$name=$val\n";
+ }
+}
+
+
+sub dump_config($) {
+ my $cfg = shift;
+ die "argument error in dump_config" unless ($cfg);
+ my %config = %$cfg;
+ foreach my $config (sort keys %config) {
+ print_cfgline($config, $config{$config});
+ }
+}
+
+sub parse_expr($);
+
+sub parse_expr($) {
+ my $pos = shift;
+ my $arg = $arg[$$pos++];
+
+ die "Parse error" if (!$arg);
+
+ if ($arg eq '&') {
+ my $arg1 = parse_expr($pos);
+ my $arg2 = parse_expr($pos);
+ return config_and($arg1, $arg2);
+ } elsif ($arg =~ /^\+/) {
+ my $arg1 = parse_expr($pos);
+ my $arg2 = parse_expr($pos);
+ return config_add($arg1, $arg2);
+ } elsif ($arg eq '>') {
+ my $arg1 = parse_expr($pos);
+ my $arg2 = parse_expr($pos);
+ return config_diff($arg1, $arg2);
+ } elsif ($arg eq '-') {
+ my $arg1 = parse_expr($pos);
+ my $arg2 = parse_expr($pos);
+ return config_sub($arg1, $arg2);
+ } else {
+ return load_config($arg);
+ }
+}
+
+my $pos = 0;
+dump_config(parse_expr(\$pos));
+die "Parse error" if ($arg[$pos]);