109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
/* $Id$
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Part of SWI-Prolog
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Author: Jan Wielemaker
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E-mail: wielemak@science.uva.nl
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WWW: http://www.swi-prolog.org
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Copyright (C): 1985-2007, University of Amsterdam
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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. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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As a special exception, if you link this library with other files,
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compiled with a Free Software compiler, to produce an executable, this
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library does not by itself cause the resulting executable to be covered
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by the GNU General Public License. This exception does not however
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invalidate any other reasons why the executable file might be covered by
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the GNU General Public License.
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*/
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#include "hash.h"
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#include <SWI-Prolog.h>
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#include <string.h>
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#define HASHKEY(hash, ptr) ((((intptr_t)ptr)>>(hash->shift)) % (hash)->entries)
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ptr_hash *
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new_ptr_hash(int entries, int shift)
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{ ptr_hash *hash = PL_malloc(sizeof(*hash));
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size_t size = sizeof(*hash->chains)*entries;
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memset(hash, 0, sizeof(*hash));
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hash->entries = entries;
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hash->shift = shift;
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hash->chains = PL_malloc(size);
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memset(hash->chains, 0, size);
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return hash;
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}
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static int
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destroy_node(ptr_hash_node *node, void *closure)
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{ PL_free(node);
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return TRUE;
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}
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void
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destroy_ptr_hash(ptr_hash *hash)
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{ for_ptr_hash(hash, destroy_node, NULL);
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PL_free(hash->chains);
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PL_free(hash);
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}
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int
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add_ptr_hash(ptr_hash *hash, void *value)
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{ int key = HASHKEY(hash, value);
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ptr_hash_node *node;
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for(node = hash->chains[key]; node; node = node->next)
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{ if ( node->value == value )
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return FALSE; /* already in hash */
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}
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node = PL_malloc(sizeof(*node));
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node->value = value;
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node->next = hash->chains[key];
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hash->chains[key] = node;
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return TRUE;
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}
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int
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for_ptr_hash(ptr_hash *hash,
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int (*func)(ptr_hash_node *node, void *closure),
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void *closure)
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{ int key;
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for(key=0; key < hash->entries; key++)
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{ ptr_hash_node *node;
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ptr_hash_node *next;
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for(node=hash->chains[key]; node; node = next)
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{ next = node->next;
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if ( !func(node, closure) )
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return FALSE;
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}
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}
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return TRUE;
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}
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