contrib/ncurses-5.4/form/fld_newftyp.c

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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 1.9 2003/11/08 20:45:36 tom Exp $")
  36
  37 static FIELDTYPE const default_fieldtype = {
  38   0,                   /* status                                      */
  39   0L,                  /* reference count                             */
  40   (FIELDTYPE *)0,      /* pointer to left  operand                    */
  41   (FIELDTYPE *)0,      /* pointer to right operand                    */
  42   NULL,                /* makearg function                            */
  43   NULL,                /* copyarg function                            */
  44   NULL,                /* freearg function                            */
  45   NULL,                /* field validation function                   */
  46   NULL,                /* Character check function                    */
  47   NULL,                /* enumerate next function                     */
  48   NULL                 /* enumerate previous function                 */
  49 };
  50
  51 NCURSES_EXPORT_VAR(const FIELDTYPE*) _nc_Default_FieldType = &default_fieldtype;
  52 \f
  53 /*---------------------------------------------------------------------------
  54 |   Facility      :  libnform
  55 |   Function      :  FIELDTYPE *new_fieldtype(
  56 |                       bool (* const field_check)(FIELD *,const void *),
  57 |                       bool (* const char_check) (int, const void *) )
  58 |
  59 |   Description   :  Create a new fieldtype. The application programmer must
  60 |                    write a field_check and a char_check function and give
  61 |                    them as input to this call.
  62 |                    If an error occurs, errno is set to
  63 |                       E_BAD_ARGUMENT  - invalid arguments
  64 |                       E_SYSTEM_ERROR  - system error (no memory)
  65 |
  66 |   Return Values :  Fieldtype pointer or NULL if error occurred
  67 +--------------------------------------------------------------------------*/
  68 NCURSES_EXPORT(FIELDTYPE *)
  69 new_fieldtype (
  70  bool (* const field_check)(FIELD *,const void *),
  71  bool (* const char_check) (int,const void *) )
  72 {
  73   FIELDTYPE *nftyp = (FIELDTYPE *)0;
  74
  75   if ( (field_check) || (char_check) )
  76     {
  77       nftyp = (FIELDTYPE *)malloc(sizeof(FIELDTYPE));
  78       if (nftyp)
  79         {
  80           *nftyp = default_fieldtype;
  81           nftyp->fcheck = field_check;
  82           nftyp->ccheck = char_check;
  83         }
  84       else
  85         {
  86           SET_ERROR( E_SYSTEM_ERROR );
  87         }
  88     }
  89   else
  90     {
  91       SET_ERROR( E_BAD_ARGUMENT );
  92     }
  93   return nftyp;
  94 }
  95
  96 /*---------------------------------------------------------------------------
  97 |   Facility      :  libnform
  98 |   Function      :  int free_fieldtype(FIELDTYPE *typ)
  99 |
 100 |   Description   :  Release the memory associated with this fieldtype.
 101 |
 102 |   Return Values :  E_OK            - success
 103 |                    E_CONNECTED     - there are fields referencing the type
 104 |                    E_BAD_ARGUMENT  - invalid fieldtype pointer
 105 +--------------------------------------------------------------------------*/
 106 NCURSES_EXPORT(int)
 107 free_fieldtype (FIELDTYPE *typ)
 108 {
 109   if (!typ)
 110     RETURN(E_BAD_ARGUMENT);
 111
 112   if (typ->ref!=0)
 113     RETURN(E_CONNECTED);
 114
 115   if (typ->status & _RESIDENT)
 116     RETURN(E_CONNECTED);
 117
 118   if (typ->status & _LINKED_TYPE)
 119     {
 120       if (typ->left ) typ->left->ref--;
 121       if (typ->right) typ->right->ref--;
 122     }
 123   free(typ);
 124   RETURN(E_OK);
 125 }
 126
 127 /* fld_newftyp.c ends here */