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

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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; }

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