payloads/libpayload/curses/form/fld_arg.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2004,2010 Free Software Foundation, Inc.              *
   3  *                                                                          *
   4  * Permission is hereby granted, free of charge, to any person obtaining a  *
   5  * copy of this software and associated documentation files (the            *
   6  * "Software"), to deal in the Software without restriction, including      *
   7  * without limitation the rights to use, copy, modify, merge, publish,      *
   8  * distribute, distribute with modifications, sublicense, and/or sell       *
   9  * copies of the Software, and to permit persons to whom the Software is    *
  10  * furnished to do so, subject to the following conditions:                 *
  11  *                                                                          *
  12  * The above copyright notice and this permission notice shall be included  *
  13  * in all copies or substantial portions of the Software.                   *
  14  *                                                                          *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  22  *                                                                          *
  23  * Except as contained in this notice, the name(s) of the above copyright   *
  24  * holders shall not be used in advertising or otherwise to promote the     *
  25  * sale, use or other dealings in this Software without prior written       *
  26  * authorization.                                                           *
  27  ****************************************************************************/
  28
  29 /****************************************************************************
  30  *   Author:  Juergen Pfeifer, 1995,1997                                    *
  31  ****************************************************************************/
  32
  33 #include "form.priv.h"
  34
  35 MODULE_ID("$Id: fld_arg.c,v 1.12 2010/01/23 21:14:35 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(FIELDTYPE *typ,
  65                   void *(*const make_arg)(va_list *),
  66                   void *(*const copy_arg)(const void *),
  67                   void (*const free_arg) (void *))
  68 {
  69   T((T_CALLED("set_fieldtype_arg(%p,%p,%p,%p)"),
  70      (void *)typ, make_arg, copy_arg, free_arg));
  71
  72   if (typ != 0 && make_arg != (void *)0)
  73     {
  74       typ->status |= _HAS_ARGS;
  75       typ->makearg = make_arg;
  76       typ->copyarg = copy_arg;
  77       typ->freearg = free_arg;
  78       RETURN(E_OK);
  79     }
  80   RETURN(E_BAD_ARGUMENT);
  81 }
  82
  83 /*---------------------------------------------------------------------------
  84 |   Facility      :  libnform
  85 |   Function      :  void *field_arg(const FIELD *field)
  86 |
  87 |   Description   :  Retrieve pointer to the fields argument structure.
  88 |
  89 |   Return Values :  Pointer to structure or NULL if none is defined.
  90 +--------------------------------------------------------------------------*/
  91 NCURSES_EXPORT(void *)
  92 field_arg(const FIELD *field)
  93 {
  94   T((T_CALLED("field_arg(%p)"), (const void *)field));
  95   returnVoidPtr(Normalize_Field(field)->arg);
  96 }
  97
  98 /* fld_arg.c ends here */