contrib/ncurses/form/fld_newftyp.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2004,2007 Free Software Foundation, Inc.              *
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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 1.15 2007/10/13 19:30:55 tom Exp $")
  36
  37 static FIELDTYPE const 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   NULL,                         /* field validation function                   */
  47   NULL,                         /* Character check function                    */
  48   NULL,                         /* enumerate next function                     */
  49   NULL                          /* enumerate previous function                 */
  50 };
  51
  52 NCURSES_EXPORT_VAR(const FIELDTYPE *)
  53 _nc_Default_FieldType = &default_fieldtype;
  54
  55 /*---------------------------------------------------------------------------
  56 |   Facility      :  libnform
  57 |   Function      :  FIELDTYPE *new_fieldtype(
  58 |                       bool (* const field_check)(FIELD *,const void *),
  59 |                       bool (* const char_check) (int, const void *) )
  60 |
  61 |   Description   :  Create a new fieldtype. The application programmer must
  62 |                    write a field_check and a char_check function and give
  63 |                    them as input to this call.
  64 |                    If an error occurs, errno is set to
  65 |                       E_BAD_ARGUMENT  - invalid arguments
  66 |                       E_SYSTEM_ERROR  - system error (no memory)
  67 |
  68 |   Return Values :  Fieldtype pointer or NULL if error occurred
  69 +--------------------------------------------------------------------------*/
  70 NCURSES_EXPORT(FIELDTYPE *)
  71 new_fieldtype(bool (*const field_check) (FIELD *, const void *),
  72               bool (*const char_check) (int, const void *))
  73 {
  74   FIELDTYPE *nftyp = (FIELDTYPE *)0;
  75
  76   T((T_CALLED("new_fieldtype(%p,%p)"), field_check, char_check));
  77   if ((field_check) || (char_check))
  78     {
  79       nftyp = typeMalloc(FIELDTYPE, 1);
  80
  81       if (nftyp)
  82         {
  83           T((T_CREATE("fieldtype %p"), nftyp));
  84           *nftyp = default_fieldtype;
  85           nftyp->fcheck = field_check;
  86           nftyp->ccheck = char_check;
  87         }
  88       else
  89         {
  90           SET_ERROR(E_SYSTEM_ERROR);
  91         }
  92     }
  93   else
  94     {
  95       SET_ERROR(E_BAD_ARGUMENT);
  96     }
  97   returnFieldType(nftyp);
  98 }
  99
 100 /*---------------------------------------------------------------------------
 101 |   Facility      :  libnform
 102 |   Function      :  int free_fieldtype(FIELDTYPE *typ)
 103 |
 104 |   Description   :  Release the memory associated with this fieldtype.
 105 |
 106 |   Return Values :  E_OK            - success
 107 |                    E_CONNECTED     - there are fields referencing the type
 108 |                    E_BAD_ARGUMENT  - invalid fieldtype pointer
 109 +--------------------------------------------------------------------------*/
 110 NCURSES_EXPORT(int)
 111 free_fieldtype(FIELDTYPE *typ)
 112 {
 113   T((T_CALLED("free_fieldtype(%p)"), typ));
 114
 115   if (!typ)
 116     RETURN(E_BAD_ARGUMENT);
 117
 118   if (typ->ref != 0)
 119     RETURN(E_CONNECTED);
 120
 121   if (typ->status & _RESIDENT)
 122     RETURN(E_CONNECTED);
 123
 124   if (typ->status & _LINKED_TYPE)
 125     {
 126       if (typ->left)
 127         typ->left->ref--;
 128       if (typ->right)
 129         typ->right->ref--;
 130     }
 131   free(typ);
 132   RETURN(E_OK);
 133 }
 134
 135 /* fld_newftyp.c ends here */