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1 /****************************************************************************
2  * Copyright 2018,2020 Thomas E. Dickey                                     *
3  * Copyright 1998-2010,2016 Free Software Foundation, Inc.                  *
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13  * The above copyright notice and this permission notice shall be included  *
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15  *                                                                          *
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27  * authorization.                                                           *
28  ****************************************************************************/
29
30 /****************************************************************************
31  *   Author:  Juergen Pfeifer, 1995,1997                                    *
32  ****************************************************************************/
33
34 #include "form.priv.h"
35
36 MODULE_ID("$Id: fld_newftyp.c,v 1.23 2020/05/24 01:40:20 anonymous.maarten Exp $")
37
38 static FIELDTYPE default_fieldtype =
39 {
40   0,                            /* status                                      */
41   0L,                           /* reference count                             */
42   (FIELDTYPE *)0,               /* pointer to left  operand                    */
43   (FIELDTYPE *)0,               /* pointer to right operand                    */
44   NULL,                         /* makearg function                            */
45   NULL,                         /* copyarg function                            */
46   NULL,                         /* freearg function                            */
47   INIT_FT_FUNC(NULL),           /* field validation function                   */
48   INIT_FT_FUNC(NULL),           /* Character check function                    */
49   INIT_FT_FUNC(NULL),           /* enumerate next function                     */
50   INIT_FT_FUNC(NULL),           /* enumerate previous function                 */
51 #if NCURSES_INTEROP_FUNCS
52   NULL                          /* generic callback alternative to makearg     */
53 #endif
54 };
55
56 FORM_EXPORT_VAR(FIELDTYPE *)
57   _nc_Default_FieldType = &default_fieldtype;
58
59 /*---------------------------------------------------------------------------
60 |   Facility      :  libnform
61 |   Function      :  FIELDTYPE *new_fieldtype(
62 |                       bool (* const field_check)(FIELD *,const void *),
63 |                       bool (* const char_check) (int, const void *) )
64 |
65 |   Description   :  Create a new fieldtype. The application programmer must
66 |                    write a field_check and a char_check function and give
67 |                    them as input to this call.
68 |                    If an error occurs, errno is set to
69 |                       E_BAD_ARGUMENT  - invalid arguments
70 |                       E_SYSTEM_ERROR  - system error (no memory)
71 |
72 |   Return Values :  Fieldtype pointer or NULL if error occurred
73 +--------------------------------------------------------------------------*/
74 FORM_EXPORT(FIELDTYPE *)
75 new_fieldtype(bool (*const field_check) (FIELD *, const void *),
76               bool (*const char_check) (int, const void *))
77 {
78   FIELDTYPE *nftyp = (FIELDTYPE *)0;
79
80   TR_FUNC_BFR(2);
81
82   T((T_CALLED("new_fieldtype(%s,%s)"),
83      TR_FUNC_ARG(0, field_check),
84      TR_FUNC_ARG(1, char_check)));
85
86   if ((field_check) || (char_check))
87     {
88       nftyp = typeMalloc(FIELDTYPE, 1);
89
90       if (nftyp)
91         {
92           T((T_CREATE("fieldtype %p"), (void *)nftyp));
93           *nftyp = default_fieldtype;
94 #if NCURSES_INTEROP_FUNCS
95           nftyp->fieldcheck.ofcheck = field_check;
96           nftyp->charcheck.occheck = char_check;
97 #else
98           nftyp->fcheck = field_check;
99           nftyp->ccheck = char_check;
100 #endif
101         }
102       else
103         {
104           SET_ERROR(E_SYSTEM_ERROR);
105         }
106     }
107   else
108     {
109       SET_ERROR(E_BAD_ARGUMENT);
110     }
111   returnFieldType(nftyp);
112 }
113
114 /*---------------------------------------------------------------------------
115 |   Facility      :  libnform
116 |   Function      :  int free_fieldtype(FIELDTYPE *typ)
117 |
118 |   Description   :  Release the memory associated with this fieldtype.
119 |
120 |   Return Values :  E_OK            - success
121 |                    E_CONNECTED     - there are fields referencing the type
122 |                    E_BAD_ARGUMENT  - invalid fieldtype pointer
123 +--------------------------------------------------------------------------*/
124 FORM_EXPORT(int)
125 free_fieldtype(FIELDTYPE *typ)
126 {
127   T((T_CALLED("free_fieldtype(%p)"), (void *)typ));
128
129   if (!typ)
130     RETURN(E_BAD_ARGUMENT);
131
132   if (typ->ref != 0)
133     RETURN(E_CONNECTED);
134
135   if (typ->status & _RESIDENT)
136     RETURN(E_CONNECTED);
137
138   if (typ->status & _LINKED_TYPE)
139     {
140       if (typ->left)
141         typ->left->ref--;
142       if (typ->right)
143         typ->right->ref--;
144     }
145   free(typ);
146   RETURN(E_OK);
147 }
148
149 /* fld_newftyp.c ends here */