freebsd-dev/contrib/ncurses/form/fld_arg.c

/****************************************************************************
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/****************************************************************************
 *   Author: Juergen Pfeifer <juergen.pfeifer@gmx.net> 1995,1997            *
 ****************************************************************************/

#include "form.priv.h"

MODULE_ID("$Id: fld_arg.c,v 1.5 2000/12/10 02:09:37 tom Exp $")

/*---------------------------------------------------------------------------
|   Facility      :  libnform  
|   Function      :  int set_fieldtype_arg(
|                            FIELDTYPE *typ,
|                            void * (* const make_arg)(va_list *),
|                            void * (* const copy_arg)(const void *),
|                            void   (* const free_arg)(void *) )
|   
|   Description   :  Connects to the type additional arguments necessary
|                    for a set_field_type call. The various function pointer
|                    arguments are:
|                       make_arg : allocates a structure for the field
|                                  specific parameters.
|                       copy_arg : duplicate the structure created by
|                                  make_arg
|                       free_arg : Release the memory allocated by make_arg
|                                  or copy_arg
|
|                    At least make_arg must be non-NULL.
|                    You may pass NULL for copy_arg and free_arg if your
|                    make_arg function doesn't allocate memory and your
|                    arg fits into the storage for a (void*).
|
|   Return Values :  E_OK           - success
|                    E_BAD_ARGUMENT - invalid argument
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(int)
set_fieldtype_arg
    (FIELDTYPE * typ,
     void * (* const make_arg)(va_list *),
     void * (* const copy_arg)(const void *),
     void   (* const free_arg)(void *))
{
  if ( !typ || !make_arg )
    RETURN(E_BAD_ARGUMENT);

  typ->status |= _HAS_ARGS;
  typ->makearg = make_arg;
  typ->copyarg = copy_arg;
  typ->freearg = free_arg;
  RETURN(E_OK);
}

/*---------------------------------------------------------------------------
|   Facility      :  libnform  
|   Function      :  void *field_arg(const FIELD *field)
|   
|   Description   :  Retrieve pointer to the fields argument structure.
|
|   Return Values :  Pointer to structure or NULL if none is defined.
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(void *)
field_arg (const FIELD * field)
{
  return Normalize_Field(field)->arg;
}

/* fld_arg.c ends here */