mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-05 20:50:43 +00:00
135 lines
2.7 KiB
C
135 lines
2.7 KiB
C
/*
|
|
hash.h
|
|
|
|
hash tables
|
|
|
|
Copyright (C) 1996-1997 Id Software, Inc.
|
|
Copyright (C) 2000 Marcus Sundberg <mackan@stacken.kth.se>
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License
|
|
as published by the Free Software Foundation; either version 2
|
|
of the License, or (at your option) any later version.
|
|
|
|
This program 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to:
|
|
|
|
Free Software Foundation, Inc.
|
|
59 Temple Place - Suite 330
|
|
Boston, MA 02111-1307, USA
|
|
|
|
$Id$
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
#ifdef HAVE_STRING_H
|
|
# include <string.h>
|
|
#endif
|
|
#ifdef HAVE_STRINGS_H
|
|
# include <strings.h>
|
|
#endif
|
|
|
|
#include "compat.h"
|
|
#include "hash.h"
|
|
|
|
static unsigned long
|
|
hash (const char *str)
|
|
{
|
|
unsigned long h = 0;
|
|
while (*str) {
|
|
h = (h << 4) + (unsigned char)*str++;
|
|
if (h&0xf0000000)
|
|
h = (h ^ (h >> 24)) & 0xfffffff;
|
|
}
|
|
return h;
|
|
}
|
|
|
|
hashtab_t *
|
|
Hash_NewTable (int tsize, char *(*gk)(void*), void (*f)(void*))
|
|
{
|
|
hashtab_t *tab = calloc (1, (size_t)&((hashtab_t*)0)->tab[tsize]);
|
|
if (!tab)
|
|
return 0;
|
|
tab->tab_size = tsize;
|
|
tab->get_key = gk;
|
|
tab->free_ele = f;
|
|
return tab;
|
|
}
|
|
|
|
void
|
|
Hash_DelTable (hashtab_t *tab)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < tab->tab_size; i++) {
|
|
while (tab->tab[i]) {
|
|
hashlink_t *t = tab->tab[i]->next;
|
|
if (tab->free_ele)
|
|
tab->free_ele (&tab->tab[i]->data);
|
|
free (tab->tab[i]);
|
|
tab->tab[i] = t;
|
|
}
|
|
}
|
|
free (tab);
|
|
}
|
|
|
|
int
|
|
Hash_Add (hashtab_t *tab, void *ele)
|
|
{
|
|
unsigned long h = hash (tab->get_key(ele));
|
|
size_t ind = h % tab->tab_size;
|
|
hashlink_t *lnk = malloc (sizeof (hashlink_t));
|
|
|
|
if (!lnk)
|
|
return -1;
|
|
if (tab->tab[ind])
|
|
tab->tab[ind]->prev = &lnk->next;
|
|
lnk->next = tab->tab[ind];
|
|
lnk->prev = &tab->tab[ind];
|
|
lnk->data = ele;
|
|
tab->tab[ind] = lnk;
|
|
return 0;
|
|
}
|
|
|
|
void *
|
|
Hash_Find (hashtab_t *tab, const char *key)
|
|
{
|
|
unsigned long h = hash (key);
|
|
size_t ind = h % tab->tab_size;
|
|
hashlink_t *lnk = tab->tab[ind];
|
|
|
|
while (lnk) {
|
|
if (strequal (key, tab->get_key (lnk->data)))
|
|
return lnk->data;
|
|
lnk = lnk->next;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
Hash_Del (hashtab_t *tab, const char *key)
|
|
{
|
|
unsigned long h = hash (key);
|
|
size_t ind = h % tab->tab_size;
|
|
hashlink_t *lnk = tab->tab[ind];
|
|
|
|
while (lnk) {
|
|
if (strequal (key, tab->get_key (lnk->data))) {
|
|
if (lnk->next)
|
|
lnk->next->prev = lnk->prev;
|
|
*lnk->prev = lnk->next;
|
|
free (lnk);
|
|
return 0;
|
|
}
|
|
lnk = lnk->next;
|
|
}
|
|
return -1;
|
|
}
|