/misc/src/release/graphviz-2.18-1/src/graphviz-2.18/lib/cdt/dtmethod.c

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00001 /* $Id: dtmethod.c,v 1.1.1.1 2004/12/23 04:04:00 ellson Exp $ $Revision: 1.1.1.1 $ */
00002 /* vim:set shiftwidth=4 ts=8: */
00003 
00004 /**********************************************************
00005 *      This software is part of the graphviz package      *
00006 *                http://www.graphviz.org/                 *
00007 *                                                         *
00008 *            Copyright (c) 1994-2004 AT&T Corp.           *
00009 *                and is licensed under the                *
00010 *            Common Public License, Version 1.0           *
00011 *                      by AT&T Corp.                      *
00012 *                                                         *
00013 *        Information and Software Systems Research        *
00014 *              AT&T Research, Florham Park NJ             *
00015 **********************************************************/
00016 
00017 #include        "dthdr.h"
00018 
00019 #ifdef DMALLOC
00020 #include "dmalloc.h"
00021 #endif
00022 
00023 /*      Change search method.
00024 **
00025 **      Written by Kiem-Phong Vo (05/25/96)
00026 */
00027 
00028 #if __STD_C
00029 Dtmethod_t *dtmethod(Dt_t * dt, Dtmethod_t * meth)
00030 #else
00031 Dtmethod_t *dtmethod(dt, meth)
00032 Dt_t *dt;
00033 Dtmethod_t *meth;
00034 #endif
00035 {
00036     reg Dtlink_t *list, *r;
00037     reg Dtdisc_t *disc = dt->disc;
00038     reg Dtmethod_t *oldmeth = dt->meth;
00039 
00040     if (!meth || meth->type == oldmeth->type)
00041         return oldmeth;
00042 
00043     if (disc->eventf &&
00044         (*disc->eventf) (dt, DT_METH, (Void_t *) meth, disc) < 0)
00045         return NIL(Dtmethod_t *);
00046 
00047     /* get the list of elements */
00048     list = dtflatten(dt);
00049 
00050     if (dt->data->type & (DT_LIST | DT_STACK | DT_QUEUE))
00051         dt->data->head = NIL(Dtlink_t *);
00052     else if (dt->data->type & (DT_SET | DT_BAG)) {
00053         if (dt->data->ntab > 0)
00054             (*dt->memoryf) (dt, (Void_t *) dt->data->htab, 0, disc);
00055         dt->data->ntab = 0;
00056         dt->data->htab = NIL(Dtlink_t **);
00057     }
00058 
00059     dt->data->here = NIL(Dtlink_t *);
00060     dt->data->type =
00061         (dt->data->type & ~(DT_METHODS | DT_FLATTEN)) | meth->type;
00062     dt->meth = meth;
00063     if (dt->searchf == oldmeth->searchf)
00064         dt->searchf = meth->searchf;
00065 
00066     if (meth->type & (DT_LIST | DT_STACK | DT_QUEUE)) {
00067         if (!(oldmeth->type & (DT_LIST | DT_STACK | DT_QUEUE))) {
00068             if ((r = list)) {
00069                 reg Dtlink_t *t;
00070                 for (t = r->right; t; r = t, t = t->right)
00071                     t->left = r;
00072                 list->left = r;
00073             }
00074         }
00075         dt->data->head = list;
00076     } else if (meth->type & (DT_OSET | DT_OBAG)) {
00077         dt->data->size = 0;
00078         while (list) {
00079             r = list->right;
00080             (*meth->searchf) (dt, (Void_t *) list, DT_RENEW);
00081             list = r;
00082         }
00083     } else if (!((meth->type & DT_BAG) && (oldmeth->type & DT_SET))) {
00084         int rehash;
00085         if ((meth->type & (DT_SET | DT_BAG))
00086             && !(oldmeth->type & (DT_SET | DT_BAG)))
00087             rehash = 1;
00088         else
00089             rehash = 0;
00090 
00091         dt->data->size = dt->data->loop = 0;
00092         while (list) {
00093             r = list->right;
00094             if (rehash) {
00095                 reg Void_t *key = OBJ(list, disc->link);
00096                 key = KEY(key, disc->key, disc->size);
00097                 list->hash = HASH(dt, key, disc, disc->size);
00098             }
00099             (void) (*meth->searchf) (dt, (Void_t *) list, DT_RENEW);
00100             list = r;
00101         }
00102     }
00103 
00104     return oldmeth;
00105 }

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