| 1 | #!/usr/bin/env perl |
| 2 | # |
| 3 | # Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org> |
| 4 | # |
| 5 | # This is free software, licensed under the GNU General Public License v2. |
| 6 | # See /LICENSE for more information. |
| 7 | # |
| 8 | |
| 9 | use warnings; |
| 10 | use strict; |
| 11 | |
| 12 | my @arg; |
| 13 | my $PREFIX = "CONFIG_"; |
| 14 | |
| 15 | sub set_config($$$$) { |
| 16 | my $config = shift; |
| 17 | my $idx = shift; |
| 18 | my $newval = shift; |
| 19 | my $mod_plus = shift; |
| 20 | |
| 21 | if (!defined($config->{$idx}) or !$mod_plus or |
| 22 | $config->{$idx} eq '#undef' or $newval eq 'y') { |
| 23 | $config->{$idx} = $newval; |
| 24 | } |
| 25 | } |
| 26 | |
| 27 | sub load_config($$) { |
| 28 | my $file = shift; |
| 29 | my $mod_plus = shift; |
| 30 | my %config; |
| 31 | |
| 32 | open FILE, "$file" or die "can't open file"; |
| 33 | while (<FILE>) { |
| 34 | chomp; |
| 35 | /^$PREFIX(.+?)=(.+)/ and do { |
| 36 | set_config(\%config, $1, $2, $mod_plus); |
| 37 | next; |
| 38 | }; |
| 39 | /^# $PREFIX(.+?) is not set/ and do { |
| 40 | set_config(\%config, $1, "#undef", $mod_plus); |
| 41 | next; |
| 42 | }; |
| 43 | /^#/ and next; |
| 44 | /^(.+)$/ and warn "WARNING: can't parse line: $1\n"; |
| 45 | } |
| 46 | return \%config; |
| 47 | } |
| 48 | |
| 49 | |
| 50 | sub config_and($$) { |
| 51 | my $cfg1 = shift; |
| 52 | my $cfg2 = shift; |
| 53 | my %config; |
| 54 | |
| 55 | foreach my $config (keys %$cfg1) { |
| 56 | my $val1 = $cfg1->{$config}; |
| 57 | my $val2 = $cfg2->{$config}; |
| 58 | $val2 and ($val1 eq $val2) and do { |
| 59 | $config{$config} = $val1; |
| 60 | }; |
| 61 | } |
| 62 | return \%config; |
| 63 | } |
| 64 | |
| 65 | |
| 66 | sub config_add($$$) { |
| 67 | my $cfg1 = shift; |
| 68 | my $cfg2 = shift; |
| 69 | my $mod_plus = shift; |
| 70 | my %config; |
| 71 | |
| 72 | for ($cfg1, $cfg2) { |
| 73 | my %cfg = %$_; |
| 74 | |
| 75 | foreach my $config (keys %cfg) { |
| 76 | if ($mod_plus and $config{$config}) { |
| 77 | next if $config{$config} eq "y"; |
| 78 | next if $cfg{$config} eq '#undef'; |
| 79 | } |
| 80 | $config{$config} = $cfg{$config}; |
| 81 | } |
| 82 | } |
| 83 | return \%config; |
| 84 | } |
| 85 | |
| 86 | sub config_diff($$$) { |
| 87 | my $cfg1 = shift; |
| 88 | my $cfg2 = shift; |
| 89 | my $new_only = shift; |
| 90 | my %config; |
| 91 | |
| 92 | foreach my $config (keys %$cfg2) { |
| 93 | if (!defined($cfg1->{$config}) or $cfg1->{$config} ne $cfg2->{$config}) { |
| 94 | next if $new_only and !defined($cfg1->{$config}) and $cfg2->{$config} eq '#undef'; |
| 95 | $config{$config} = $cfg2->{$config}; |
| 96 | } |
| 97 | } |
| 98 | return \%config |
| 99 | } |
| 100 | |
| 101 | sub config_sub($$) { |
| 102 | my $cfg1 = shift; |
| 103 | my $cfg2 = shift; |
| 104 | my %config = %{$cfg1}; |
| 105 | |
| 106 | foreach my $config (keys %$cfg2) { |
| 107 | delete $config{$config}; |
| 108 | } |
| 109 | return \%config; |
| 110 | } |
| 111 | |
| 112 | sub print_cfgline($$) { |
| 113 | my $name = shift; |
| 114 | my $val = shift; |
| 115 | if ($val eq '#undef' or $val eq 'n') { |
| 116 | print "# $PREFIX$name is not set\n"; |
| 117 | } else { |
| 118 | print "$PREFIX$name=$val\n"; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | |
| 123 | sub dump_config($) { |
| 124 | my $cfg = shift; |
| 125 | die "argument error in dump_config" unless ($cfg); |
| 126 | my %config = %$cfg; |
| 127 | foreach my $config (sort keys %config) { |
| 128 | print_cfgline($config, $config{$config}); |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | sub parse_expr { |
| 133 | my $pos = shift; |
| 134 | my $mod_plus = shift; |
| 135 | my $arg = $arg[$$pos++]; |
| 136 | |
| 137 | die "Parse error" if (!$arg); |
| 138 | |
| 139 | if ($arg eq '&') { |
| 140 | my $arg1 = parse_expr($pos); |
| 141 | my $arg2 = parse_expr($pos); |
| 142 | return config_and($arg1, $arg2); |
| 143 | } elsif ($arg =~ /^\+/) { |
| 144 | my $arg1 = parse_expr($pos); |
| 145 | my $arg2 = parse_expr($pos); |
| 146 | return config_add($arg1, $arg2, 0); |
| 147 | } elsif ($arg =~ /^m\+/) { |
| 148 | my $arg1 = parse_expr($pos); |
| 149 | my $arg2 = parse_expr($pos, 1); |
| 150 | return config_add($arg1, $arg2, 1); |
| 151 | } elsif ($arg eq '>') { |
| 152 | my $arg1 = parse_expr($pos); |
| 153 | my $arg2 = parse_expr($pos); |
| 154 | return config_diff($arg1, $arg2, 0); |
| 155 | } elsif ($arg eq '>+') { |
| 156 | my $arg1 = parse_expr($pos); |
| 157 | my $arg2 = parse_expr($pos); |
| 158 | return config_diff($arg1, $arg2, 1); |
| 159 | } elsif ($arg eq '-') { |
| 160 | my $arg1 = parse_expr($pos); |
| 161 | my $arg2 = parse_expr($pos); |
| 162 | return config_sub($arg1, $arg2); |
| 163 | } else { |
| 164 | return load_config($arg, $mod_plus); |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | while (@ARGV > 0 and $ARGV[0] =~ /^-\w+$/) { |
| 169 | my $cmd = shift @ARGV; |
| 170 | if ($cmd =~ /^-n$/) { |
| 171 | $PREFIX = ""; |
| 172 | } elsif ($cmd =~ /^-p$/) { |
| 173 | $PREFIX = shift @ARGV; |
| 174 | } else { |
| 175 | die "Invalid option: $cmd\n"; |
| 176 | } |
| 177 | } |
| 178 | @arg = @ARGV; |
| 179 | |
| 180 | my $pos = 0; |
| 181 | dump_config(parse_expr(\$pos)); |
| 182 | die "Parse error" if ($arg[$pos]); |
| 183 | |
