fld_newftyp.c

/****************************************************************************
 * Copyright (c) 1998 Free Software Foundation, Inc.                        *
 *                                                                          *
 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
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 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 *                                                                          *
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 * holders shall not be used in advertising or otherwise to promote the     *
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 * authorization.                                                           *
 ****************************************************************************/

/****************************************************************************
 *   Author: Juergen Pfeifer <[email protected]> 1995,1997            *
 ****************************************************************************/

#include "form.priv.h"

MODULE_ID("$Id$")

static FIELDTYPE const default_fieldtype = {
  0,                   /* status                                      */
  0L,                  /* reference count                             */
  (FIELDTYPE *)0,      /* pointer to left  operand                    */
  (FIELDTYPE *)0,      /* pointer to right operand                    */
  NULL,                /* makearg function                            */
  NULL,                /* copyarg function                            */
  NULL,                /* freearg function                            */
  NULL,                /* field validation function                   */
  NULL,                /* Character check function                    */
  NULL,                /* enumerate next function                     */
  NULL                 /* enumerate previous function                 */
};

const FIELDTYPE* _nc_Default_FieldType = &default_fieldtype;

/*---------------------------------------------------------------------------
|   Facility      :  libnform  
|   Function      :  FIELDTYPE *new_fieldtype(
|                       bool (* const field_check)(FIELD *,const void *),
|                       bool (* const char_check) (int, const void *) ) 
|   
|   Description   :  Create a new fieldtype. The application programmer must
|                    write a field_check and a char_check function and give
|                    them as input to this call.
|                    If an error occurs, errno is set to                    
|                       E_BAD_ARGUMENT  - invalid arguments
|                       E_SYSTEM_ERROR  - system error (no memory)
|
|   Return Values :  Fieldtype pointer or NULL if error occurred
+--------------------------------------------------------------------------*/
FIELDTYPE *new_fieldtype(
 bool (* const field_check)(FIELD *,const void *),
 bool (* const char_check) (int,const void *) )
{
  FIELDTYPE *nftyp = (FIELDTYPE *)0;
  
  if ( (field_check) || (char_check) )
    {
      nftyp = (FIELDTYPE *)malloc(sizeof(FIELDTYPE));
      if (nftyp)
	{
	  *nftyp = default_fieldtype;
	  nftyp->fcheck = field_check;
	  nftyp->ccheck = char_check;
	}
      else
	{
	  SET_ERROR( E_SYSTEM_ERROR );
	}
    }
  else
    {
      SET_ERROR( E_BAD_ARGUMENT );
    }
  return nftyp;
}

/*---------------------------------------------------------------------------
|   Facility      :  libnform  
|   Function      :  int free_fieldtype(FIELDTYPE *typ)
|   
|   Description   :  Release the memory associated with this fieldtype.
|
|   Return Values :  E_OK            - success
|                    E_CONNECTED     - there are fields referencing the type
|                    E_BAD_ARGUMENT  - invalid fieldtype pointer
+--------------------------------------------------------------------------*/
int free_fieldtype(FIELDTYPE *typ)
{
  if (!typ)
    RETURN(E_BAD_ARGUMENT);

  if (typ->ref!=0)
    RETURN(E_CONNECTED);

  if (typ->status & _RESIDENT)
    RETURN(E_CONNECTED);

  if (typ->status & _LINKED_TYPE)
    {
      if (typ->left ) typ->left->ref--;
      if (typ->right) typ->right->ref--;
    }
  free(typ);
  RETURN(E_OK);
}

/* fld_newftyp.c ends here */