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[/] [or1k/] [branches/] [oc/] [gdb-5.0/] [intl/] [hash-string.h] - Blame information for rev 1765

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1 106 markom
/* Implements a string hashing function.
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   Copyright (C) 1995, 1997 Free Software Foundation, Inc.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   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
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   GNU 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 the GNU C Library; see the file COPYING.LIB.  If not,
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   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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   Boston, MA 02111-1307, USA.  */
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#ifdef HAVE_VALUES_H
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# include <values.h>
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#endif
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/* @@ end of prolog @@ */
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#ifndef PARAMS
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# if __STDC__
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#  define PARAMS(Args) Args
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# else
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#  define PARAMS(Args) ()
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# endif
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#endif
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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 unsigned long hash_string PARAMS ((const char *__str_param));
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static inline unsigned long
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hash_string (str_param)
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     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 long) *str++;
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      g = hval & ((unsigned long) 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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}

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