+=item ut_snumbern COLUMN
+
+Check/untaint signed numeric data (whole numbers). If there is an error,
+returns the error, otherwise returns false.
+
+=cut
+
+sub ut_snumbern {
+ my($self, $field) = @_;
+ $self->getfield($field) =~ /^(-?)\s*(\d*)$/
+ or return "Illegal (numeric) $field: ". $self->getfield($field);
+ if ($1) {
+ return "Illegal (numeric) $field: ". $self->getfield($field)
+ unless $2;
+ }
+ $self->setfield($field, "$1$2");
+ '';
+}
+