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 $PREFIX = "CONFIG_";
  14
  15 sub load_config($) {
  16         my $file = shift;
  17         my %config;
  18
  19         open FILE, "$file" or die "can't open file";
  20         while (<FILE>) {
  21                 chomp;
  22                 /^$PREFIX(.+?)=(.+)/ and do {
  23                         $config{$1} = $2;
  24                         next;
  25                 };
  26                 /^# $PREFIX(.+?) is not set/ and do {
  27                         $config{$1} = "#undef";
  28                         next;
  29                 };
  30                 /^#/ and next;
  31                 /^(.+)$/ and warn "WARNING: can't parse line: $1\n";
  32         }
  33         return \%config;
  34 }
  35
  36
  37 sub config_and($$) {
  38         my $cfg1 = shift;
  39         my $cfg2 = shift;
  40         my %config;
  41
  42         foreach my $config (keys %$cfg1) {
  43                 my $val1 = $cfg1->{$config};
  44                 my $val2 = $cfg2->{$config};
  45                 $val2 and ($val1 eq $val2) and do {
  46                         $config{$config} = $val1;
  47                 };
  48         }
  49         return \%config;
  50 }
  51
  52
  53 sub config_add($$$) {
  54         my $cfg1 = shift;
  55         my $cfg2 = shift;
  56         my $mod_plus = shift;
  57         my %config;
  58
  59         for ($cfg1, $cfg2) {
  60                 my %cfg = %$_;
  61
  62                 foreach my $config (keys %cfg) {
  63                         next if $mod_plus and $config{$config} and $config{$config} eq "y";
  64                         $config{$config} = $cfg{$config};
  65                 }
  66         }
  67         return \%config;
  68 }
  69
  70 sub config_diff($$) {
  71         my $cfg1 = shift;
  72         my $cfg2 = shift;
  73         my %config;
  74
  75         foreach my $config (keys %$cfg2) {
  76                 if (!defined($cfg1->{$config}) or $cfg1->{$config} ne $cfg2->{$config}) {
  77                         $config{$config} = $cfg2->{$config};
  78                 }
  79         }
  80         return \%config
  81 }
  82
  83 sub config_sub($$) {
  84         my $cfg1 = shift;
  85         my $cfg2 = shift;
  86         my %config = %{$cfg1};
  87
  88         foreach my $config (keys %$cfg2) {
  89                 delete $config{$config};
  90         }
  91         return \%config;
  92 }
  93
  94 sub print_cfgline($$) {
  95         my $name = shift;
  96         my $val = shift;
  97         if ($val eq '#undef' or $val eq 'n') {
  98                 print "# $PREFIX$name is not set\n";
  99         } else {
 100                 print "$PREFIX$name=$val\n";
 101         }
 102 }
 103
 104
 105 sub dump_config($) {
 106         my $cfg = shift;
 107         die "argument error in dump_config" unless ($cfg);
 108         my %config = %$cfg;
 109         foreach my $config (sort keys %config) {
 110                 print_cfgline($config, $config{$config});
 111         }
 112 }
 113
 114 sub parse_expr($);
 115
 116 sub parse_expr($) {
 117         my $pos = shift;
 118         my $arg = $arg[$$pos++];
 119
 120         die "Parse error" if (!$arg);
 121
 122         if ($arg eq '&') {
 123                 my $arg1 = parse_expr($pos);
 124                 my $arg2 = parse_expr($pos);
 125                 return config_and($arg1, $arg2);
 126         } elsif ($arg =~ /^\+/) {
 127                 my $arg1 = parse_expr($pos);
 128                 my $arg2 = parse_expr($pos);
 129                 return config_add($arg1, $arg2, 0);
 130         } elsif ($arg =~ /^m\+/) {
 131                 my $arg1 = parse_expr($pos);
 132                 my $arg2 = parse_expr($pos);
 133                 return config_add($arg1, $arg2, 1);
 134         } elsif ($arg eq '>') {
 135                 my $arg1 = parse_expr($pos);
 136                 my $arg2 = parse_expr($pos);
 137                 return config_diff($arg1, $arg2);
 138         } elsif ($arg eq '-') {
 139                 my $arg1 = parse_expr($pos);
 140                 my $arg2 = parse_expr($pos);
 141                 return config_sub($arg1, $arg2);
 142         } else {
 143                 return load_config($arg);
 144         }
 145 }
 146
 147 while (@ARGV > 0 and $ARGV[0] =~ /^-\w+$/) {
 148         my $cmd = shift @ARGV;
 149         if ($cmd =~ /^-n$/) {
 150                 $PREFIX = "";
 151         } elsif ($cmd =~ /^-p$/) {
 152                 $PREFIX = shift @ARGV;
 153         } else {
 154                 die "Invalid option: $cmd\n";
 155         }
 156 }
 157 @arg = @ARGV;
 158
 159 my $pos = 0;
 160 dump_config(parse_expr(\$pos));
 161 die "Parse error" if ($arg[$pos]);