#!/usr/bin/perl

# just point this at a dir tree that has some c code in it, e.g. foo.pl /usr/src/linux
# it will scan the *.[ch] files for a #if or #ifdef line, and then should print:
#
# not in dbgline state is WWWXXXabc1234
# in dbgline state is WWWXXXabc1234
#
# but it doesn't!  It prints:
#
# not in dbgline state is WWWXXXabc1234
# in dbgline state is abc1234
#
# Ok, now it gets really weird.  If the RE the line is matched against
# changes from /^\s*#\s*if/ to /^\s*#\s*i/ then it does print the right
# thing!  How is this possible?!!

use strict;
use File::Find;

sub filter_source ($) {
	my %state=();
	$state{'abc'} = 1234;

	open IN,  "<@_[0]";
	while (<IN>) {
		# if you remove the 'f' from the end of this RE, then
		# dgbline will see the WWW=>XXX added to %state
		# otherwise, it somehow doesn't see it and thinks %state
		# is only abc=>1234
		if (/^\s*#\s*if/) { # try /^\s*#\s*i/
			$state{'WWW'} = 'XXX';
			print STDERR "not in dbgline state is ", %state, "\n";
			dbgline('test');
		}
	}
	close IN;

	sub dbgline($) {
		print STDERR "in dbgline state is ", %state, "\n";
	}
}

sub parse_dir {
	my $file = $File::Find::name;
	filter_source($file) if ($file =~ /\.[ch]$/);
}

my $SRC = shift;
find(\&parse_dir, $SRC);