/*
 * tclHash.c --
 *
 *	Implementation of in-memory hash tables for Tcl and Tcl-based
 *	applications.
 *
 * Copyright (c) 1991-1993 The Regents of the University of California.
 * Copyright (c) 1994 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclHash.c,v 1.47 2010/12/01 09:58:52 nijtmans Exp $
 */

#include "tclInt.h"

/*
 * Prevent macros from clashing with function definitions.
 */

 * The following macro takes a preliminary integer hash value and produces an
 * index into a hash tables bucket list. The idea is to make it so that
 * preliminary values that are arbitrarily similar will end up in different
 * buckets. The hash function was taken from a random-number generator.
 */

#define RANDOM_INDEX(tablePtr, i) \
    ((((i)*1103515245L) >> (tablePtr)->downShift) & (tablePtr)->mask)

/*
 * Prototypes for the array hash key methods.
 */

static Tcl_HashEntry *	AllocArrayEntry(Tcl_HashTable *tablePtr, void *keyPtr);
static int		CompareArrayKeys(void *keyPtr, Tcl_HashEntry *hPtr);

    } else {
	typePtr = &tclArrayHashKeyType;
    }

#if TCL_HASH_KEY_STORE_HASH
    if (typePtr->hashKeyProc == NULL
	    || typePtr->flags & TCL_HASH_KEY_RANDOMIZE_HASH) {
	index = RANDOM_INDEX(tablePtr, PTR2INT(entryPtr->hash));
    } else {
	index = PTR2UINT(entryPtr->hash) & tablePtr->mask;
    }

    bucketPtr = &tablePtr->buckets[index];
#else
    bucketPtr = entryPtr->bucketPtr;

    for (oldChainPtr = oldBuckets; oldSize > 0; oldSize--, oldChainPtr++) {
	for (hPtr = *oldChainPtr; hPtr != NULL; hPtr = *oldChainPtr) {
	    *oldChainPtr = hPtr->nextPtr;
#if TCL_HASH_KEY_STORE_HASH
	    if (typePtr->hashKeyProc == NULL
		    || typePtr->flags & TCL_HASH_KEY_RANDOMIZE_HASH) {
		index = RANDOM_INDEX(tablePtr, PTR2INT(hPtr->hash));
	    } else {
		index = PTR2UINT(hPtr->hash) & tablePtr->mask;
	    }
	    hPtr->nextPtr = tablePtr->buckets[index];
	    tablePtr->buckets[index] = hPtr;
#else
	    void *key = Tcl_GetHashKey(tablePtr, hPtr);