set_field_type associates the specified field type with field.
Certain field types take additional arguments.
TYPE_ALNUM, for instance, requires one,
the minimum width specification for the field.
The other predefined field types are: TYPE_ALPHA,
TYPE_ENUM, TYPE_INTEGER,
TYPE_NUMERIC, TYPE_REGEXP.
field_type returns a pointer to the field type of field.
NULL is returned if no field type is assigned.
field_arg returns a pointer to the field arguments associated with
the field type of field.
NULL is returned if no field type is assigned.
<Return> value
field_type and field_arg return NULL on error.
set_field_type returns one of the following:
E_OK
-
The function returned successfully.
E_SYSTEM_ERROR
-
System error.
Notices
The header file form.h automatically includes the header files
eti.h and ocurses.h.