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#! /usr/bin/perl

#

# checkconfig: find uses of CONFIG_* names without matching definitions.

# Copyright abandoned, 1998, Michael Elizabeth Chastain <mailto:mec@shout.net>.

use integer;

$| = 1;

foreach $file (@ARGV)

{

    # Open this file.

    open(FILE, $file) || die "Can't open $file: $!\n";

    # Initialize variables.

    my $fInComment   = 0;

    my $fInString    = 0;

    my $fUseConfig   = 0;

    my $iLinuxConfig = 0;

    my %configList   = ();

    LINE: while ( <FILE> )

    {

        # Strip comments.

        $fInComment && (s+^.*?\*/+ +o ? ($fInComment = 0) : next);

        m+/\*+o && (s+/\*.*?\*/+ +go, (s+/\*.*$+ +o && ($fInComment = 1)));

        # Pick up definitions.

        if ( m/^\s*#/o )

        {

            $iLinuxConfig      = $. if m/^\s*#\s*include\s*"linux\/config\.h"/o;

            $configList{uc $1} = 1  if m/^\s*#\s*include\s*"config\/(\S*)\.h"/o;

        }

        # Strip strings.

        $fInString && (s+^.*?"+ +o ? ($fInString = 0) : next);

        m+"+o && (s+".*?"+ +go, (s+".*$+ +o && ($fInString = 1)));

        # Pick up definitions.

        if ( m/^\s*#/o )

        {

            $iLinuxConfig      = $. if m/^\s*#\s*include\s*<linux\/config\.h>/o;

            $configList{uc $1} = 1  if m/^\s*#\s*include\s*<config\/(\S*)\.h>/o;

            $configList{$1}    = 1  if m/^\s*#\s*define\s+CONFIG_(\w*)/o;

            $configList{$1}    = 1  if m/^\s*#\s*undef\s+CONFIG_(\w*)/o;

        }

        # Look for usages.

        next unless m/CONFIG_/o;

        WORD: while ( m/\bCONFIG_(\w+)/og )

        {

            $fUseConfig = 1;

            last LINE if $iLinuxConfig;

            next WORD if exists $configList{$1};

            print "$file: $.: need CONFIG_$1.\n";

            $configList{$1} = 0;

        }

    }

    # Report superfluous includes.

    if ( $iLinuxConfig && ! $fUseConfig )

        { print "$file: $iLinuxConfig: linux/config.h not needed.\n"; }

    close(FILE);

}