/* Implements a string hashing function.   Copyright (C) 1995, 1997 Free Software Foundation, Inc.   This program is free software; you can redistribute it and/or modify   it under the terms of the GNU General Public License as published by   the Free Software Foundation; either version 2, or (at your option)   any later version.   This program 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 General Public License for more details.   You should have received a copy of the GNU Library General Public   License along with the GNU C Library; see the file COPYING.LIB.  If not,   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,   Boston, MA 02111-1307, USA.  *//* @@ end of prolog @@ */#ifndef PARAMS# if __STDC__#  define PARAMS(Args) Args# else#  define PARAMS(Args) ()# endif#endif/* We assume to have `unsigned long int' value with at least 32 bits.  */#define HASHWORDBITS 32/* 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.]  */static unsigned long hash_string PARAMS ((const char *__str_param));static inline unsigned longhash_string (str_param)     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 long) *str++;      g = hval & ((unsigned long) 0xf << (HASHWORDBITS - 4));      if (g != 0)	{	  hval ^= g >> (HASHWORDBITS - 8);	  hval ^= g;	}    }  return hval;}