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/* libmb
* Copyright (C) 2002 Matthew Allum
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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.
*/
#define _GNU_SOURCE
#include "hash.h"
// static struct nlist *hashtab[HASHSIZE];
struct hash*
hash_new(int size)
{
struct hash *h = (struct hash *)(malloc(sizeof(struct hash)));
h->size = size;
h->hashtab = (struct nlist **)(malloc(sizeof(struct nlist)*size));
memset((void *)h->hashtab, 0, sizeof(struct nlist)*size);
return h;
}
unsigned int hashfunc(struct hash *h, char *s)
{
unsigned int hashval;
for(hashval = 0; *s != '\0'; s++)
hashval = *s + 21 * hashval;
return hashval % h->size;
}
struct nlist *hash_lookup(struct hash *h, char *s)
{
struct nlist *np;
for (np = h->hashtab[hashfunc(h, s)]; np != NULL; np = np->next)
if (strcmp(s, np->key) == 0)
return np;
return NULL;
}
struct nlist *hash_add(struct hash *h, char *key, char *val)
{
struct nlist *np;
unsigned int hashval;
if ((np = hash_lookup(h, key)) == NULL)
{
np = (struct nlist * ) malloc(sizeof(*np));
if ( np == NULL || (np->key = strdup(key)) == NULL)
return NULL;
hashval = hashfunc(h, key);
np->next = h->hashtab[hashval];
h->hashtab[hashval] = np;
} else {
free((void *) np->value);
}
if ((np->value = (unsigned char*)strdup(val)) == NULL)
return NULL;
return np;
}
void hash_empty(struct hash *h)
{
memset(h->hashtab, 0, sizeof(*h->hashtab));
}
void
hash_destroy(struct hash *h)
{
struct nlist *np = NULL, *op = NULL;
int i;
for (i=0;i<h->size;i++)
if (h->hashtab[i])
{
np = h->hashtab[i];
while (np != NULL)
{
op = np->next;
if (np->key) free(np->key);
if (np->value) free(np->value);
free(np);
np = op;
}
}
free(h->hashtab);
free(h);
}
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