/* Implements a string hashing function.
Copyright (C) 1995, 1997, 1998, 2000, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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modify it under the terms of the GNU Lesser General Public
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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# include <config.h>
/* Specification. */
/* Defines the so called `hashpjw' function by P.J. Weinberger
[see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools,
1986, 1987 Bell Telephone Laboratories, Inc.] */
unsigned long int
__hash_string (const char *str_param)
unsigned long int hval, g;
const char *str = str_param;
/* Compute the hash value for the given string. */
hval = 0;
while (*str != '\0')
hval <<= 4;
hval += (unsigned char) *str++;
g = hval & ((unsigned long int) 0xf << (HASHWORDBITS - 4));
if (g != 0)
hval ^= g >> (HASHWORDBITS - 8);
hval ^= g;