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