form/fld_newftyp.c

   1 /****************************************************************************
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  14  *                                                                          *
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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_newftyp.c,v 1.19 2010/01/23 21:14:36 tom Exp $")
  36
  37 static 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
  55 NCURSES_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 +--------------------------------------------------------------------------*/
  73 NCURSES_EXPORT(FIELDTYPE *)
  74 new_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 +--------------------------------------------------------------------------*/
 118 NCURSES_EXPORT(int)
 119 free_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 */