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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1998-2009. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*
*/
#include <stdlib.h>
#include <string.h>
#include "hash.h"
/* free a hash bucket. If the bucket contained a long key (more that
* EI_SMALLKEY) the bucket is thrown away (really freed). If the
* bucket contained a short key, then it can be saved on the freelist
* for later use. Buckets with short keys have (key == keybuf).
*/
void ei_hash_bfree(ei_hash *tab, ei_bucket *b)
{
if (!b) return;
/* we throw away buckets with long keys (i.e. non-standard buckets) */
if (b->key != b->keybuf) {
/* fprintf(stderr,"freeing bucket with long key (%s)\n",b->key); */
free(b);
}
else {
/* others we save on (tab-local) freelist */
/* fprintf(stderr,"saving bucket with short key (%s)\n",b->key); */
b->next = tab->freelist;
tab->freelist = b;
}
return;
}
void *ei_hash_remove(ei_hash *tab, const char *key)
{
ei_bucket *b=NULL, *tmp=NULL;
const void *oldval=NULL;
int h, rh;
rh = tab->hash(key);
h = rh % tab->size;
/* is it in the first position? */
if ((b=tab->tab[h])) {
if ((rh == b->rawhash) && (!strcmp(key,b->key))) {
tab->tab[h] = b->next;
oldval = b->value;
ei_hash_bfree(tab,b);
tab->nelem--;
if (!tab->tab[h]) tab->npos--;
}
else {
/* is it later in the chain? */
while (b->next) {
if ((rh == b->next->rawhash) && (!strcmp(key,b->next->key))) {
tmp = b->next;
b->next = tmp->next;
oldval = tmp->value;
ei_hash_bfree(tab,tmp);
tab->nelem--;
break;
}
b=b->next;
}
}
}
return (void *)oldval;
}
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