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NetBSD 6.1.5 - man page for set_fieldtype_choice (netbsd section 3)

FORMS(3)			   BSD Library Functions Manual 			 FORMS(3)

NAME
     free_fieldtype, link_fieldtype, new_fieldtype, set_fieldtype_arg, set_fieldtype_choice --
     form library

LIBRARY
     Curses Form Library (libform, -lform)

SYNOPSIS
     #include <form.h>

     int
     free_fieldtype(FIELDTYPE *fieldtype);

     FIELDTYPE *
     link_fieldtype(FIELDTYPE *type1, FIELDTYPE *type2);

     FIELDTYPE *
     new_fieldtype(int (*field_check)(FIELD *, char *), int (*char_check)(int, char *));

     int
     set_fieldtype_arg(FIELDTYPE *fieldtype, char * (*make_args)(va_list *),
	 char * (*copy_args)(char *), void (*free_args)(char *));

     int
     set_fieldtype_choice(FIELDTYPE *fieldtype, int (*next_choice)(FIELD *, char *),
	 int (*prev_choice)(FIELD *, char *));

DESCRIPTION
     The function free_fieldtype() frees the storage associated with the field type and destroys
     it.  The function link_fieldtype() links together the two given field types to produce a new
     field type.  A new field type can be created by calling new_fieldtype() which requires
     pointers to two functions which perform validation, the field_check function must validate
     the field contents and return TRUE if they are acceptable and FALSE if they are not.  The
     char_check validates the character input into the field, this function will be called for
     each character entered, if the character can be entered into the field then char_check must
     return TRUE.  Neither field_check nor char_check may be NULL.  The functions for handling
     the field type arguments can be defined by using the set_fieldtype_arg() function, the
     make_args function is used to create new arguments for the fieldtype, the copy_args is used
     to copy the fieldtype arguments to a new arguments structure and free_args is used to
     destroy the fieldtype arguments and release any associated storage, none of these function
     pointers may be NULL.  The field type choice functions can be set by calling
     set_fieldtype_choice(), the next_choice and prev_choice specify the next and previous choice
     functions for the field type.  These functions must perform the necessary actions to select
     the next or previous choice for the field, updating the field buffer if necessary.  The
     choice functions must return TRUE if the function succeeded and FALSE otherwise.

RETURN VALUES
     Functions returning pointers will return NULL if an error is detected.  The functions that
     return an int will return one of the following error values:

     E_OK		The function was successful.
     E_BAD_ARGUMENT	The function was passed a bad argument.
     E_CONNECTED	The field is connected to a form.

SEE ALSO
     curses(3), forms(3)

NOTES
     The header <form.h> automatically includes both <curses.h> and <eti.h>.

BSD					 January 1, 2001				      BSD


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