## root/libglibc/hash-string.c(272.html)

/* [<][>][^][v][top][bottom][index][help] */

## DEFINITIONS

This source file includes following definitions.

1. __hash_string

    /* 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 St, Fifth Floor, Boston, MA
       02110-1301  USA. */

    #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 (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 char) *str++;
          g = hval & ((unsigned long int) 0xf << (HASHWORDBITS - 4));
          if (g != 0)
            {
              hval ^= g >> (HASHWORDBITS - 8);
              hval ^= g;
            }
        }
      return hval;
    }

/* [<][>][^][v][top][bottom][index][help] */