contrib/ncurses-5.4/form/fld_arg.c

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  28
  29 /****************************************************************************
  30  *   Author:  Juergen Pfeifer, 1995,1997                                    *
  31  ****************************************************************************/
  32
  33 #include "form.priv.h"
  34
  35 MODULE_ID("$Id: fld_arg.c,v 1.7 2003/10/25 15:17:08 tom Exp $")
  36
  37 /*---------------------------------------------------------------------------
  38 |   Facility      :  libnform
  39 |   Function      :  int set_fieldtype_arg(
  40 |                            FIELDTYPE *typ,
  41 |                            void * (* const make_arg)(va_list *),
  42 |                            void * (* const copy_arg)(const void *),
  43 |                            void   (* const free_arg)(void *) )
  44 |
  45 |   Description   :  Connects to the type additional arguments necessary
  46 |                    for a set_field_type call. The various function pointer
  47 |                    arguments are:
  48 |                       make_arg : allocates a structure for the field
  49 |                                  specific parameters.
  50 |                       copy_arg : duplicate the structure created by
  51 |                                  make_arg
  52 |                       free_arg : Release the memory allocated by make_arg
  53 |                                  or copy_arg
  54 |
  55 |                    At least make_arg must be non-NULL.
  56 |                    You may pass NULL for copy_arg and free_arg if your
  57 |                    make_arg function doesn't allocate memory and your
  58 |                    arg fits into the storage for a (void*).
  59 |
  60 |   Return Values :  E_OK           - success
  61 |                    E_BAD_ARGUMENT - invalid argument
  62 +--------------------------------------------------------------------------*/
  63 NCURSES_EXPORT(int)
  64 set_fieldtype_arg
  65     (FIELDTYPE * typ,
  66      void * (* const make_arg)(va_list *),
  67      void * (* const copy_arg)(const void *),
  68      void   (* const free_arg)(void *))
  69 {
  70   if ( !typ || !make_arg )
  71     RETURN(E_BAD_ARGUMENT);
  72
  73   typ->status |= _HAS_ARGS;
  74   typ->makearg = make_arg;
  75   typ->copyarg = copy_arg;
  76   typ->freearg = free_arg;
  77   RETURN(E_OK);
  78 }
  79
  80 /*---------------------------------------------------------------------------
  81 |   Facility      :  libnform
  82 |   Function      :  void *field_arg(const FIELD *field)
  83 |
  84 |   Description   :  Retrieve pointer to the fields argument structure.
  85 |
  86 |   Return Values :  Pointer to structure or NULL if none is defined.
  87 +--------------------------------------------------------------------------*/
  88 NCURSES_EXPORT(void *)
  89 field_arg (const FIELD * field)
  90 {
  91   return Normalize_Field(field)->arg;
  92 }
  93
  94 /* fld_arg.c ends here */