form_fieldtype, new_fieldtype, free_fieldtype, set_fieldtype_arg, set_fieldtype_choice, link_fieldtype - forms fieldtype routines
cc [ flag... ] file... –lform –lcurses [ library... ]
#include <form.h>
FIELDTYPE *new_fieldtype(int (* field_check)(FIELD *, char *),
int (*char_check)(int, char *));
int free_fieldtype(FIELDTYPE *fieldtype);
int set_fieldtype_arg(FIELDTYPE *fieldtype, char *(* mak_arg)(va_list *),
char *(* copy_arg)(char *), void (* free_arg)(char *));
int set_fieldtype_choice(FIELDTYPE *fieldtype, int (* next_choice)
(FIELD *, char *), int (*prev_choice)(FIELD *, char *));
FIELDTYPE *link_fieldtype(FIELDTYPE *type1, FIELDTYPE *type2);
new_fieldtype() creates a new field type. The application programmer must write the function field_check, which validates the field value, and the function char_check, which validates each character. free_fieldtype () frees the space allocated for the field type.
By associating function pointers with a field type, set_fieldtype_arg() connects to the field type additional arguments necessary for a set_field_type() call. Function mak_arg allocates a structure for the field specific parameters to set_field_type() and returns a pointer to the saved data. Function copy_arg duplicates the structure created by make_arg. Function free_arg frees any storage allocated by make_arg or copy_arg.
The form_driver() requests REQ_NEXT_CHOICE and REQ_PREV_CHOICE let the user request the next or previous value of a field type comprising an ordered set of values. set_fieldtype_choice() allows the application programmer to implement these requests for the given field type. It associates with the given field type those application-defined functions that return pointers to the next or previous choice for the field.
link_fieldtype() returns a pointer to the field type built from the two given types. The constituent types may be any application-defined or pre-defined types.
Routines that return pointers always return NULL on error. Routines that return an integer return one of the following:
The function returned successfully.
System error.
An argument is incorrect.
Type is connected to one or more fields.
See attributes(5) for descriptions of the following attributes:
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curses(3CURSES), forms(3CURSES), attributes(5)
The header <form.h> automatically includes the headers <eti.h> and <curses.h>.