icon Top 9 categories map      RocketAware > man pages >


Tips: Browse or Search all pages for efficient awareness of more than 6000 of the most popular reusable and open source applications, functions, libraries, and FAQs.

The "RKT couplings" below include links to source code, updates, additional information, advice, FAQs, and overviews.


Search all pages


By activity
Professions, Sciences, Humanities, Business, ...

User Interface
Text-based, GUI, Audio, Video, Keyboards, Mouse, Images,...

Text Strings
Conversions, tests, processing, manipulation,...

Integer, Floating point, Matrix, Statistics, Boolean, ...

Algorithms, Memory, Process control, Debugging, ...

Stored Data
Data storage, Integrity, Encryption, Compression, ...

Networks, protocols, Interprocess, Remote, Client Server, ...

Hard World
Timing, Calendar and Clock, Audio, Video, Printer, Controls...

File System
Management, Filtering, File & Directory access, Viewers, ...


RocketLink!--> Man page versions: OpenBSD

form_field(3)                                       form_field(3)

       form_fieldtype - define validation-field types

       #include <form.h>
       FIELDTYPE *new_fieldtype(
           bool (* const field_check)(FIELD *, const void *),
           bool (* const char_check)(int, const void *));
       int free_fieldtype(FIELDTYPE *fieldtype);
       int set_fieldtype_arg(
           FIELDTYPE *fieldtype,
           void *(* const make_arg)(va_list *),
           void *(* const copy_arg)(const void *),
           void  (* const free_arg)(void *));
       int set_fieldtype_choice(
           FIELDTYPE *fieldtype
           bool (* const next_choice)(FIELD *, const void *),
           bool (* const prev_choice)(FIELD *, const void *));
       FIELDTYPE *link_fieldtype(FIELDTYPE *type1,
                                 FIELDTYPE *type2);

       The function new_fieldtype creates a new field type usable
       for data validation.  You supply it  with  field_check,  a
       predicate  to check the validity of an entered data string
       whenever the user attempt to leave a field.  The (FIELD *)
       argument  is passed in so the validation predicate can see
       the field's buffer, sizes and other attributes; the second
       argument  is an argument-block structure, about which more

       You also supply new_fieldtype with char_check, a  function
       to  validate input characters as they are entered; it will
       be passed the character to be checked and a pointer to  an
       argument-block structure.

       The  function free_fieldtype frees the space allocated for
       a given validation type.

       The function set_fieldtype associates  three  storage-man-
       agement functions with a field type.  The mak_arg function
       is automatically applied to the list of arguments you give
       set_field_type  when  attaching validation to a field; its
       job is to bundle these into  an  allocated  argument-block
       object which can later be passed to validation predicated.
       The other two hook arguments should copy  and  free  argu-
       ment-block  structures.   They  will be used by the forms-
       driver code. You must supply  the  mak_arg  function,  the
       other  two  are optional, you may supply NULL for them. In
       this case it is assumed,  that  mak_arg  doesn't  allocate
       memory  but simply loads the argument into a single scalar

       The   form    driver    requests    REQ_NEXT_CHOICE    and


form_field(3)                                       form_field(3)

       REQ_PREV_CHOICE assume that the possible values of a field
       form an ordered set, and provide the forms user with a way
       to  move  through the set.  The set_fieldtype_choice func-
       tion allows forms programmers to define successor and pre-
       decessor  functions  for  the field type.  These functions
       take the field pointer and an argument-block structure  as

       The pointer-valued routines return NULL on error.

       The  integer-valued  routines  return one of the following
       codes on error:

       E_OK The routine succeeded.

            System error occurred (see errno).

            Routine detected an incorrect or  out-of-range  argu-

            The field is already connected to a form.

       curses(3), form(3).

       The header file <form.h> automatically includes the header
       file <curses.h>.

       All of the (char *) arguments of  these  functions  should
       actually  be (void *).  The type has been left uncorrected
       for strict compatibility with System V.

       These routines emulate the System V forms  library.   They
       were not supported on Version 7 or BSD versions.

       Juergen  Pfeifer.   Manual  pages  and  adaptation for new
       curses by Eric S. Raymond.


Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.

(Corrections, notes, and links courtesy of RocketAware.com)

[Detailed Topics]
OpenBSD sources for form_fieldtype(3)

[Overview Topics]

Up to: Curses forms - Curses (Library for text display interface) on screen forms

RocketLink!--> Man page versions: OpenBSD

Rapid-Links: Search | About | Comments | Submit Path: RocketAware > man pages > form_fieldtype.3/
RocketAware.com is a service of Mib Software
Copyright 1999, Forrest J. Cavalier III. All Rights Reserved.
We welcome submissions and comments