#!/usr/local/bin/perl -w
use strict;
use warnings;
use Getopt::Std;

my $RCSID = '$Id: include.perl,v 1.2 2007-01-31 14:42:16-08 - - $';
$0 =~ s|/*$||; $0 =~ s|^.*/||;
my $EXITCODE = 0;
END { exit $EXITCODE; }
sub note(@){ print STDERR "$0: @_"; };
$SIG{'__WARN__'} = sub { note @_; $EXITCODE = 1; };
$SIG{'__DIE__'} = sub { warn @_; exit; };

my $MAN_PAGE = <<__END_MAN_PAGE__;
#
# NAME
#    $0 - search C source for #include statements
#
# SYNOPSIS
#    $0 -h | csourcefile...
#
# DESCRIPTION
#    Takes a sequence of C source files as arguments and prints
#    each line number and reference to an include file.
#
# OPTIONS
#    -h  Prints out help information in man page format.
#
# $RCSID
__END_MAN_PAGE__
$MAN_PAGE =~ s/^#[ ]?//mg;

use Getopt::Std;

my %dependencies;
my %foundfile;
my @worklist;
my %OPTIONS;
push@worklist , [undef, $ARGV[0]];
 
getopts "mhsu", \%OPTIONS;
print $MAN_PAGE and exit if $OPTIONS{'h'};
die "Usage: $0 -h | csourcefile...\n" unless @ARGV;
 
for my $filename (@ARGV) {

while (@worklist) {
   my $pair = shift @worklist;
   my $target = $pair->[0];
   my $source = $pair->[1];
   
   print ("test entire @worklist\n");
   
   unless (open FILE, $filename) {
      warn "$filename: $!\n";
   }else {   

      my $target = $filename;
      $target =~ s|\.c$|\.o|;
      $dependencies {"$target: $filename"} = 1;
      $foundfile{$filename} = 1;
      while (defined (my $line = <FILE>)) {
         next unless $line =~ m/^\s*#include\s+(<.*?>|".*?")\s*$/;
         my $include = $1;
         $include =~ s|"(.*)"|$1|;
         $include =~ s|<(.*)>|/usr/include/$1|;
         $dependencies {"$target: $include"} = 1;
         print "$filename: $.: $include\n";
         push@worklist, [$target, $include] unless $foundfile{$include};
         $foundfile{$include} = 1;
   
      };
   };
   close FILE;
}
}