#!/usr/bin/perl
# Generate loadparm interfaces tables for Samba3/Samba4 integration
# by Andrew Bartlett
# based on mkproto.pl Written by Jelmer Vernooij
# based on the original mkproto.sh by Andrew Tridgell

use strict;

# don't use warnings module as it is not portable enough
# use warnings;

use Getopt::Long;
use File::Basename;
use File::Path;

#####################################################################
# read a file into a string

my $file = undef;
my $public_define = undef;
my $_public = "";
my $_private = "";
my $public_data = \$_public;
my $builddir = ".";
my $srcdir = ".";

sub public($)
{
	my ($d) = @_;
	$$public_data .= $d;
}

sub usage()
{
	print "Usage: mks3param.pl [options] [c files]\n";
	print "OPTIONS:\n";
	print "  --srcdir=path          Read files relative to this directory\n";
	print "  --builddir=path        Write file relative to this directory\n";
	print "  --help                 Print this help message\n\n";
	exit 0;
}

GetOptions(
	'file=s' => sub { my ($f,$v) = @_; $file = $v; },
	'srcdir=s' => sub { my ($f,$v) = @_; $srcdir = $v; },
	'builddir=s' => sub { my ($f,$v) = @_; $builddir = $v; },
	'help' => \&usage
) or exit(1);

sub file_load($)
{
    my($filename) = @_;
    local(*INPUTFILE);
    open(INPUTFILE, $filename) or return undef;
    my($saved_delim) = $/;
    undef $/;
    my($data) = <INPUTFILE>;
    close(INPUTFILE);
    $/ = $saved_delim;
    return $data;
}

sub print_header($)
{
	my ($file) = @_;
	$file->("/* This file was automatically generated by mks3param_ctx.pl. DO NOT EDIT */\n\n");
	$file->("static const struct loadparm_s3_helpers s3_fns =\n");
	$file->("{\n");
	$file->("\t.get_parametric = lp_parm_const_string_service,\n");
	$file->("\t.get_parm_struct = lp_get_parameter,\n");
	$file->("\t.get_parm_ptr = lp_parm_ptr,\n");
	$file->("\t.get_service = lp_service_for_s4_ctx,\n");
	$file->("\t.get_servicebynum = lp_servicebynum_for_s4_ctx,\n");
	$file->("\t.get_default_loadparm_service = lp_default_loadparm_service,\n");
	$file->("\t.get_numservices = lp_numservices,\n");
	$file->("\t.load = lp_load_for_s4_ctx,\n");
	$file->("\t.set_cmdline = lp_set_cmdline,\n");
	$file->("\t.dump = lp_dump,\n");
}

sub print_footer($)
{
	my ($file) = @_;
	$file->("};");
}

sub handle_loadparm($$)
{
	my ($file,$line) = @_;

	# STRING isn't handled here, as we still don't know what to do with the substituted vars */
	# LOCAL also isn't handled here
	if ($line =~ /^FN_(GLOBAL)_(CONST_STRING|BOOL|bool|CHAR|INTEGER|LIST)\((\w+),.*\)/o) {
		my $scope = $1;
		my $type = $2;
		my $name = $3;

		$file->("\t.$name = lp_$name,\n");
	}
}

sub process_file($$)
{
	my ($file, $filename) = @_;

	$filename =~ s/\.o$/\.c/g;

	if ($filename =~ /^\//) {
		open(FH, "<$filename") or die("Failed to open $filename");
	} elsif (!open(FH, "< $builddir/$filename")) {
	    open(FH, "< $srcdir/$filename") || die "Failed to open $filename";
	}

	my $comment = undef;
	my $incomment = 0;
	while (my $line = <FH>) {
		if ($line =~ /^FN_/) {
			handle_loadparm($file, $line);
		}
		next;
	}

	close(FH);
}


print_header(\&public);

process_file(\&public, $_) foreach (@ARGV);
print_footer(\&public);

if (not defined($file)) {
	print STDOUT $$public_data;
}

mkpath(dirname($file), 0, 0755);
open(PUBLIC, ">$file") or die("Can't open `$file': $!");
print PUBLIC "$$public_data";
close(PUBLIC);