xref: /freebsd/contrib/ncurses/form/fld_arg.c (revision 282a3889ebf826db9839be296ff1dd903f6d6d6e)
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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 1.11 2004/12/25 22:20:18 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      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)"), field));
95   returnVoidPtr(Normalize_Field(field)->arg);
96 }
97 
98 /* fld_arg.c ends here */
99