+=item ut_snumber COLUMN
+
+Check/untaint signed numeric data (whole numbers). May not be null. If there
+is an error, returns the error, otherwise returns false.
+
+=cut
+
+sub ut_snumber {
+ my($self, $field) = @_;
+ $self->getfield($field) =~ /^(-?)\s*(\d+)$/
+ or return "Illegal or empty (numeric) $field: ". $self->getfield($field);
+ $self->setfield($field, "$1$2");
+ '';
+}
+