mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-05 20:50:43 +00:00
4489319298
external to the progs file are now malloced and then freed at progs reload. All that needs to be implementd for gc to work is the scanner and deallocator.
159 lines
3.2 KiB
C
159 lines
3.2 KiB
C
/*
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hash.h
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hash tables
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Copyright (C) 1996-1997 Id Software, Inc.
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Copyright (C) 2000 Marcus Sundberg <mackan@stacken.kth.se>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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$Id$
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include "compat.h"
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#include "hash.h"
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static unsigned long
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hash (const char *str)
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{
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//FIXME not 64 bit clean
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#if 0
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unsigned long h = 0;
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while (*str) {
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h = (h << 4) + (unsigned char)*str++;
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if (h&0xf0000000)
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h = (h ^ (h >> 24)) & 0xfffffff;
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}
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return h;
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#else
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// dx_hack_hash
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// shamelessly stolen from Daniel Phillips <phillips@innominate.de>
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// from his post to lkml
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unsigned long hash0 = 0x12a3fe2d, hash1 = 0x37abe8f9;
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while (*str)
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{
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unsigned long hash = hash1 + (hash0 ^ (*str++ * 71523));
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if (hash < 0) hash -= 0x7fffffff;
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hash1 = hash0;
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hash0 = hash;
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}
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return hash0;
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#endif
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}
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hashtab_t *
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Hash_NewTable (int tsize, char *(*gk)(void*,void*), void (*f)(void*,void*),
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void *ud)
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{
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hashtab_t *tab = calloc (1, (size_t)&((hashtab_t*)0)->tab[tsize]);
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if (!tab)
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return 0;
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tab->tab_size = tsize;
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tab->user_data = ud;
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tab->get_key = gk;
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tab->free_ele = f;
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return tab;
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}
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void
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Hash_DelTable (hashtab_t *tab)
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{
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Hash_FlushTable (tab);
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free (tab);
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}
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void
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Hash_FlushTable (hashtab_t *tab)
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{
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int i;
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for (i = 0; i < tab->tab_size; i++) {
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while (tab->tab[i]) {
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hashlink_t *t = tab->tab[i]->next;
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if (tab->free_ele)
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tab->free_ele (tab->tab[i]->data, tab->user_data);
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free (tab->tab[i]);
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tab->tab[i] = t;
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}
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}
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}
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int
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Hash_Add (hashtab_t *tab, void *ele)
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{
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unsigned long h = hash (tab->get_key(ele, tab->user_data));
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size_t ind = h % tab->tab_size;
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hashlink_t *lnk = malloc (sizeof (hashlink_t));
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if (!lnk)
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return -1;
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if (tab->tab[ind])
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tab->tab[ind]->prev = &lnk->next;
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lnk->next = tab->tab[ind];
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lnk->prev = &tab->tab[ind];
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lnk->data = ele;
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tab->tab[ind] = lnk;
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return 0;
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}
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void *
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Hash_Find (hashtab_t *tab, const char *key)
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{
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unsigned long h = hash (key);
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size_t ind = h % tab->tab_size;
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hashlink_t *lnk = tab->tab[ind];
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while (lnk) {
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if (strequal (key, tab->get_key (lnk->data, tab->user_data)))
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return lnk->data;
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lnk = lnk->next;
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}
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return 0;
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}
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int
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Hash_Del (hashtab_t *tab, const char *key)
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{
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unsigned long h = hash (key);
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size_t ind = h % tab->tab_size;
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hashlink_t *lnk = tab->tab[ind];
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while (lnk) {
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if (strequal (key, tab->get_key (lnk->data, tab->user_data))) {
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if (lnk->next)
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lnk->next->prev = lnk->prev;
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*lnk->prev = lnk->next;
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free (lnk);
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return 0;
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}
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lnk = lnk->next;
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}
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return -1;
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}
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