If you do not plan to use the range setting facility for a new field type, you do not need to write a range setting function.
Instead of writing your own, you can use the range setting functions provided by the package. They are as follows:
| rgset() | For all field types except string-based |
| rgset_st() | For F_STRING fields |
| rgset_date() | For F_DATE fields |
| rgset_time() | For F_TIME fields |
Defining a Range Structure for the Field Type
Specifications for a Range Setting Function
