cctools-port/cctools/libstuff/hash_string.c

44 lines
1.4 KiB
C

/*
* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#include <stdint.h>
#include "stuff/hash_string.h"
/*
* A hash function used for converting a string into a single number. It is
* then usually mod'ed with the hash table size to get an index into the hash
* table.
*/
__private_extern__
int32_t
hash_string(
char *key)
{
char *cp;
int32_t k;
cp = key;
k = 0;
while(*cp)
k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
return(k);
}