sh_iter.c

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/*
** Copyright (C) 2002 by Kevin L. Mitchell <klmitch@mit.edu>
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Library General Public
** License as published by the Free Software Foundation; either
** version 2 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
** Library General Public License for more details.
**
** You should have received a copy of the GNU Library General Public
** License along with this library; if not, write to the Free
** Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
** MA 02111-1307, USA
**
** @(#)$Id: sh_iter.c,v 1.5 2006/07/13 19:16:24 klmitch Exp $
*/
#include "dbprim.h"
#include "dbprim_int.h"

RCSTAG("@(#)$Id: sh_iter.c,v 1.5 2006/07/13 19:16:24 klmitch Exp $");

struct _sh_iter_s {
  smat_table_t *si_table;       
  smat_iter_t   si_iter;        
  void         *si_extra;       
};

static unsigned long
_sh_iter_iter(link_head_t *head, link_elem_t *elem, void *extra)
{
  struct _sh_iter_s *si;

  si = extra;

  /* call the user iteration function--with appropriate translation */
  return (*si->si_iter)(si->si_table, le_object(elem), si->si_extra);
}

unsigned long
sh_iter(smat_head_t *head, smat_entry_t *start,
        smat_iter_t iter_func, void *extra, unsigned long flags)
{
  struct _sh_iter_s si;

  initialize_dbpr_error_table(); /* initialize error table */

  /* verify arguments */
  if (!sh_verify(head) || (start && !se_verify(start)) || !iter_func)
    return DB_ERR_BADARGS;

  /* initialize extra data... */
  si.si_table = head->sh_table;
  si.si_iter = iter_func;
  si.si_extra = extra;

  /* call into linked list library to iterate over the list */
  return ll_iter(&head->sh_head, start ? &start->se_link[head->sh_elem] : 0,
                 _sh_iter_iter, &si, flags);
}

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