NAME

form_hook: set_form_init, form_init, set_form_term, form_term, set_field_init, ­field_init, set_field_term, field_term − assign application-­specific routines for invocation by forms

SYNOPSIS

#include <form.h>
int set_form_init(FORM ∗form, void (∗func)(FORM ∗));
void (∗)(FORM ∗) form_init(FORM ∗form);
int set_form_term(FORM ∗form, void (∗func)(FORM ∗));
void (∗)(FORM ∗) form_term(FORM ∗form);
int set_field_init(FORM ∗form, void (∗func)(FORM ∗));
void (∗)(FORM ∗) field_init(FORM ∗form);
int set_field_term(FORM ∗form, void (∗func)(FORM ∗));
void (∗)(FORM ∗) field_term(FORM ∗form);

DESCRIPTION

These routines allow the programmer to assign application specific routines to be executed automatically at initialization and termination points in the forms application.  The user need not specify any application-defined initialization or termination routines at all, but they may be helpful for displaying messages or page numbers and other chores. 

set_form_init assigns an application-defined initialization function to be called when the form is posted and just after a page change.  form_init returns a pointer to the initialization function, if any. 

set_form_term assigns an application-defined function to be called when the form is unposted and just before a page change.  form_term returns a pointer to the function, if any. 

set_field_init assigns an application-defined function to be called when the form is posted and just after the current field changes.  field_init returns a pointer to the function, if any. 

set_field_term assigns an application-defined function to be called when the form is unposted and just before the current field changes.  field_term returns a pointer to the function, if any. 

RETURN VALUE

Routines that return pointers always return NULL on error.  Routines that return an integer return one of the following:

NOTES

The header file form.h automatically includes the header files eti.h and curses.h. 

SEE ALSO

curses(3X), forms(3X)