use utf8;
use strict;
use warnings; no warnings qw(redefine);
use Dbase::Help qw(DoFn);
use Dbase::Globals qw(in_euro);
use Fehler qw(problem warnung);
use Loader qw(strip_kn);

sub valid_tarif($;$$) {
	my($id,$flag,$kn) = @_;
	$flag = 0 unless $flag;
	my $err;

	return problem $kn,"ID '$id' ist nicht numerisch!\n" unless $id =~ /^\d+$/;
	return problem $kn,"Tarif '$id' gibt es nicht."
		unless DoFn("select count(*) from tarif where id = $id");

	$kn = strip_kn($kn)."Tarif_$id";

	unless($flag & 1) {
		warnung "Alter Tarif","DM-Preise!"
			unless in_euro(DoFn("select beginn from tarif where id=$id"));
	}

	$err ? undef : $id;
}
1;
