sunos man page for new_fieldtype

form_fieldtype(3CURSES) 				     Curses Library Functions					   form_fieldtype(3CURSES)

NAME
       form_fieldtype, new_fieldtype, free_fieldtype, set_fieldtype_arg, set_fieldtype_choice, link_fieldtype - forms fieldtype routines

SYNOPSIS
       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);

DESCRIPTION
       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.

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

       E_OK		       The function returned successfully.

       E_SYSTEM_ERROR	       System error.

       E_BAD_ARGUMENT	       An argument is incorrect.

       E_CONNECTED	       Type is connected to one or more fields.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       curses(3CURSES), forms(3CURSES), attributes(5)

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

SunOS 5.10							    31 Dec 1996 					   form_fieldtype(3CURSES)