text: /* Implements hashing function for string with known length.
     Copyright (C) 1996-2020 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
     Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
  
     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, see
     <https://www.gnu.org/licenses/>.  */
  
  #include <sys/types.h>
  
  /* We assume to have `size_t' 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 size_t hash_string (const char *__str_param, size_t __len);
  
  static inline size_t
  hash_string (const char *str_param, size_t len)
  {
    size_t hval, g;
    const char *end_str = str_param + len;
  
    /* Compute the hash value for the given string.  */
    hval = len;
    while (str_param != end_str)
      {
        hval <<= 4;
        hval += (size_t) *str_param++;
        g = hval & ((size_t) 0xf << (HASHWORDBITS - 4));
        if (g != 0)
  	{
  	  hval ^= g >> (HASHWORDBITS - 8);
  	  hval ^= g;
  	}
      }
    return hval;
  }
  