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/* Description of GNU message catalog format: string hashing function.
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   Copyright (C) 1995, 1997-1998, 2000-2003 Free Software Foundation, Inc.
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   This program is free software; you can redistribute it and/or modify it
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   under the terms of the GNU Library General Public License as published
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   by the Free Software Foundation; either version 2, or (at your option)
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   any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Library General Public License for more details.
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   You should have received a copy of the GNU Library General Public
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   License along with this program; if not, write to the Free Software
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   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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   USA.  */
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/* @@ end of prolog @@ */
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/* We assume to have `unsigned long int' value with at least 32 bits.  */
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#define HASHWORDBITS 32
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/* Defines the so called `hashpjw' function by P.J. Weinberger
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   [see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools,
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   1986, 1987 Bell Telephone Laboratories, Inc.]  */
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static inline unsigned long int
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hash_string (const char *str_param)
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{
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  unsigned long int hval, g;
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  const char *str = str_param;
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  /* Compute the hash value for the given string.  */
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  hval = 0;
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  while (*str != '\0')
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    {
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      hval <<= 4;
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      hval += (unsigned char) *str++;
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      g = hval & ((unsigned long int) 0xf << (HASHWORDBITS - 4));
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      if (g != 0)
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        {
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          hval ^= g >> (HASHWORDBITS - 8);
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          hval ^= g;
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        }
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    }
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  return hval;
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}