FreeBSD/Linux Kernel Cross Reference
sys/scripts/checkincludes.pl

     #!/usr/bin/perl
     #
     # checkincludes: Find files included more than once in (other) files.
     # Copyright abandoned, 2000, Niels Kristian Bech Jensen <nkbj@image.dk>.
     
     foreach $file (@ARGV) {
             open(FILE, $file) or die "Cannot open $file: $!.\n";
     
             my %includedfiles = ();
    
            while (<FILE>) {
                    if (m/^\s*#\s*include\s*[<"](\S*)[>"]/o) {
                            ++$includedfiles{$1};
                    }
            }
            
            foreach $filename (keys %includedfiles) {
                    if ($includedfiles{$filename} > 1) {
                            print "$file: $filename is included more than once.\n";
                    }
            }
    
            close(FILE);
    }

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