/* 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.   The GNU C Library is free software; you can redistribute it and/or   modify it under the terms of the GNU Lesser General Public   License as published by the Free Software Foundation; either   version 2.1 of the License, or (at your option) any later version.   The GNU C Library is distributed in the hope that it will be useful,   but WITHOUT ANY WARRANTY; without even the implied warranty of   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU   Lesser General Public License for more details.   You should have received a copy of the GNU Lesser General Public   License along with the GNU C Library; if not, write to the Free   Software Foundation, Inc., 51 Franklin Street, Fifth Floor,   Boston, MA 02110-1301, USA.  */#ifdef HAVE_CONFIG_H# include <config.h>#endif/* Specification.  */#include "hash-string.h"/* 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;	}    }  return hval;}