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  • Committer: alvherre
  • Date: 2005-12-16 21:24:52 UTC
  • Revision ID: svn-v4:db760fc0-0f08-0410-9d63-cc6633f64896:trunk:1
Initial import of the REL8_0_3 sources from the Pgsql CVS repository.

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src/backend/utils/hash/hashfn.c
 
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/*-------------------------------------------------------------------------
 
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 *
 
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 * hashfn.c
 
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 *              Hash functions for use in dynahash.c hashtables
 
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 *
 
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 *
 
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 * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
 
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 * Portions Copyright (c) 1994, Regents of the University of California
 
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 *
 
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 *
 
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 * IDENTIFICATION
 
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 *        $PostgreSQL: pgsql/src/backend/utils/hash/hashfn.c,v 1.22 2004-12-31 22:01:37 pgsql Exp $
 
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 *
 
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 *-------------------------------------------------------------------------
 
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 */
 
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#include "postgres.h"
 
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#include "access/hash.h"
 
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#include "utils/hsearch.h"
 
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/*
 
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 * string_hash: hash function for keys that are null-terminated strings.
 
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 *
 
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 * NOTE: this is the default hash function if none is specified.
 
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 */
 
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uint32
 
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string_hash(const void *key, Size keysize)
 
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{
 
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        return DatumGetUInt32(hash_any((const unsigned char *) key,
 
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                                                                   (int) strlen((const char *) key)));
 
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}
 
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/*
 
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 * tag_hash: hash function for fixed-size tag values
 
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 */
 
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uint32
 
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tag_hash(const void *key, Size keysize)
 
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{
 
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        return DatumGetUInt32(hash_any((const unsigned char *) key,
 
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                                                                   (int) keysize));
 
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}