scripts/kconfig.pl

   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                         next if $mod_plus and $config{$config} and $config{$config} eq "y";
  77                         $config{$config} = $cfg{$config};
  78                 }
  79         }
  80         return \%config;
  81 }
  82
  83 sub config_diff($$$) {
  84         my $cfg1 = shift;
  85         my $cfg2 = shift;
  86         my $new_only = shift;
  87         my %config;
  88
  89         foreach my $config (keys %$cfg2) {
  90                 if (!defined($cfg1->{$config}) or $cfg1->{$config} ne $cfg2->{$config}) {
  91                         next if $new_only and !defined($cfg1->{$config}) and $cfg2->{$config} eq '#undef';
  92                         $config{$config} = $cfg2->{$config};
  93                 }
  94         }
  95         return \%config
  96 }
  97
  98 sub config_sub($$) {
  99         my $cfg1 = shift;
 100         my $cfg2 = shift;
 101         my %config = %{$cfg1};
 102
 103         foreach my $config (keys %$cfg2) {
 104                 delete $config{$config};
 105         }
 106         return \%config;
 107 }
 108
 109 sub print_cfgline($$) {
 110         my $name = shift;
 111         my $val = shift;
 112         if ($val eq '#undef' or $val eq 'n') {
 113                 print "# $PREFIX$name is not set\n";
 114         } else {
 115                 print "$PREFIX$name=$val\n";
 116         }
 117 }
 118
 119
 120 sub dump_config($) {
 121         my $cfg = shift;
 122         die "argument error in dump_config" unless ($cfg);
 123         my %config = %$cfg;
 124         foreach my $config (sort keys %config) {
 125                 print_cfgline($config, $config{$config});
 126         }
 127 }
 128
 129 sub parse_expr {
 130         my $pos = shift;
 131         my $mod_plus = shift;
 132         my $arg = $arg[$$pos++];
 133
 134         die "Parse error" if (!$arg);
 135
 136         if ($arg eq '&') {
 137                 my $arg1 = parse_expr($pos);
 138                 my $arg2 = parse_expr($pos);
 139                 return config_and($arg1, $arg2);
 140         } elsif ($arg =~ /^\+/) {
 141                 my $arg1 = parse_expr($pos);
 142                 my $arg2 = parse_expr($pos);
 143                 return config_add($arg1, $arg2, 0);
 144         } elsif ($arg =~ /^m\+/) {
 145                 my $arg1 = parse_expr($pos);
 146                 my $arg2 = parse_expr($pos, 1);
 147                 return config_add($arg1, $arg2, 1);
 148         } elsif ($arg eq '>') {
 149                 my $arg1 = parse_expr($pos);
 150                 my $arg2 = parse_expr($pos);
 151                 return config_diff($arg1, $arg2, 0);
 152         } elsif ($arg eq '>+') {
 153                 my $arg1 = parse_expr($pos);
 154                 my $arg2 = parse_expr($pos);
 155                 return config_diff($arg1, $arg2, 1);
 156         } elsif ($arg eq '-') {
 157                 my $arg1 = parse_expr($pos);
 158                 my $arg2 = parse_expr($pos);
 159                 return config_sub($arg1, $arg2);
 160         } else {
 161                 return load_config($arg, $mod_plus);
 162         }
 163 }
 164
 165 while (@ARGV > 0 and $ARGV[0] =~ /^-\w+$/) {
 166         my $cmd = shift @ARGV;
 167         if ($cmd =~ /^-n$/) {
 168                 $PREFIX = "";
 169         } elsif ($cmd =~ /^-p$/) {
 170                 $PREFIX = shift @ARGV;
 171         } else {
 172                 die "Invalid option: $cmd\n";
 173         }
 174 }
 175 @arg = @ARGV;
 176
 177 my $pos = 0;
 178 dump_config(parse_expr(\$pos));
 179 die "Parse error" if ($arg[$pos]);