scripts/kconfig.pl

   1 #!/usr/bin/env perl
   2 #
   3 # Copyright (C) 2006 Felix Fietkau <nbd@nbd.name>
   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 '$file'";
  33         while (<FILE>) {
  34                 chomp;
  35                 /^$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]);