dtrestore.c

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#include        "dthdr.h"

/*      Restore dictionary from given tree or list of elements.
**      There are two cases. If called from within, list is nil.
**      From without, list is not nil and data->size must be 0.
**
**      Written by Kiem-Phong Vo (5/25/96)
*/

int dtrestore(reg Dt_t* dt, reg Dtlink_t* list)
{
        reg Dtlink_t    *t, **s, **ends;
        reg int         type;
        reg Dtsearch_f  searchf = dt->meth->searchf;

        type = dt->data->type&DT_FLATTEN;
        if(!list) /* restoring a flattened dictionary */
        {       if(!type)
                        return -1;
                list = dt->data->here;
        }
        else    /* restoring an extracted list of elements */
        {       if(dt->data->size != 0)
                        return -1;
                type = 0;
        }
        dt->data->type &= ~DT_FLATTEN;

        if(dt->data->type&(DT_SET|DT_BAG))
        {       dt->data->here = NIL(Dtlink_t*);
                if(type) /* restoring a flattened dictionary */
                {       for(ends = (s = dt->data->htab) + dt->data->ntab; s < ends; ++s)
                        {       if((t = *s) )
                                {       *s = list;
                                        list = t->right;
                                        t->right = NIL(Dtlink_t*);
                                }
                        }
                }
                else    /* restoring an extracted list of elements */
                {       dt->data->size = 0;
                        while(list)
                        {       t = list->right;
                                (*searchf)(dt,(void*)list,DT_RENEW);
                                list = t;
                        }
                }
        }
        else
        {       if(dt->data->type&(DT_OSET|DT_OBAG))
                        dt->data->here = list;
                else /*if(dt->data->type&(DT_LIST|DT_STACK|DT_QUEUE))*/
                {       dt->data->here = NIL(Dtlink_t*);
                        dt->data->head = list;
                }
                if(!type)
                        dt->data->size = -1;
        }

        return 0;
}