1/****************************************************************************
2 * Copyright (c) 1998-2009,2010 Free Software Foundation, Inc.              *
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9 * copies of the Software, and to permit persons to whom the Software is    *
10 * furnished to do so, subject to the following conditions:                 *
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27 ****************************************************************************/
28
29/****************************************************************************
30 *   Author:  Juergen Pfeifer, 1995,1997                                    *
31 ****************************************************************************/
32
33#include "form.priv.h"
34
35MODULE_ID("$Id: fld_newftyp.c,v 1.19 2010/01/23 21:14:36 tom Exp $")
36
37static FIELDTYPE default_fieldtype =
38{
39  0,				/* status                                      */
40  0L,				/* reference count                             */
41  (FIELDTYPE *)0,		/* pointer to left  operand                    */
42  (FIELDTYPE *)0,		/* pointer to right operand                    */
43  NULL,				/* makearg function                            */
44  NULL,				/* copyarg function                            */
45  NULL,				/* freearg function                            */
46  INIT_FT_FUNC(NULL),		/* field validation function                   */
47  INIT_FT_FUNC(NULL),		/* Character check function                    */
48  INIT_FT_FUNC(NULL),		/* enumerate next function                     */
49  INIT_FT_FUNC(NULL),		/* enumerate previous function                 */
50#if NCURSES_INTEROP_FUNCS
51  NULL				/* generic callback alternative to makearg     */
52#endif
53};
54
55NCURSES_EXPORT_VAR(FIELDTYPE *)
56_nc_Default_FieldType = &default_fieldtype;
57
58/*---------------------------------------------------------------------------
59|   Facility      :  libnform
60|   Function      :  FIELDTYPE *new_fieldtype(
61|                       bool (* const field_check)(FIELD *,const void *),
62|                       bool (* const char_check) (int, const void *) )
63|
64|   Description   :  Create a new fieldtype. The application programmer must
65|                    write a field_check and a char_check function and give
66|                    them as input to this call.
67|                    If an error occurs, errno is set to
68|                       E_BAD_ARGUMENT  - invalid arguments
69|                       E_SYSTEM_ERROR  - system error (no memory)
70|
71|   Return Values :  Fieldtype pointer or NULL if error occurred
72+--------------------------------------------------------------------------*/
73NCURSES_EXPORT(FIELDTYPE *)
74new_fieldtype(bool (*const field_check) (FIELD *, const void *),
75	      bool (*const char_check) (int, const void *))
76{
77  FIELDTYPE *nftyp = (FIELDTYPE *)0;
78
79  T((T_CALLED("new_fieldtype(%p,%p)"), field_check, char_check));
80  if ((field_check) || (char_check))
81    {
82      nftyp = typeMalloc(FIELDTYPE, 1);
83
84      if (nftyp)
85	{
86	  T((T_CREATE("fieldtype %p"), (void *)nftyp));
87	  *nftyp = default_fieldtype;
88#if NCURSES_INTEROP_FUNCS
89	  nftyp->fieldcheck.ofcheck = field_check;
90	  nftyp->charcheck.occheck = char_check;
91#else
92	  nftyp->fcheck = field_check;
93	  nftyp->ccheck = char_check;
94#endif
95	}
96      else
97	{
98	  SET_ERROR(E_SYSTEM_ERROR);
99	}
100    }
101  else
102    {
103      SET_ERROR(E_BAD_ARGUMENT);
104    }
105  returnFieldType(nftyp);
106}
107
108/*---------------------------------------------------------------------------
109|   Facility      :  libnform
110|   Function      :  int free_fieldtype(FIELDTYPE *typ)
111|
112|   Description   :  Release the memory associated with this fieldtype.
113|
114|   Return Values :  E_OK            - success
115|                    E_CONNECTED     - there are fields referencing the type
116|                    E_BAD_ARGUMENT  - invalid fieldtype pointer
117+--------------------------------------------------------------------------*/
118NCURSES_EXPORT(int)
119free_fieldtype(FIELDTYPE *typ)
120{
121  T((T_CALLED("free_fieldtype(%p)"), (void *)typ));
122
123  if (!typ)
124    RETURN(E_BAD_ARGUMENT);
125
126  if (typ->ref != 0)
127    RETURN(E_CONNECTED);
128
129  if (typ->status & _RESIDENT)
130    RETURN(E_CONNECTED);
131
132  if (typ->status & _LINKED_TYPE)
133    {
134      if (typ->left)
135	typ->left->ref--;
136      if (typ->right)
137	typ->right->ref--;
138    }
139  free(typ);
140  RETURN(E_OK);
141}
142
143/* fld_newftyp.c ends here */
144