1 /* hash-pjw.c -- compute a hash value from a NUL-terminated string.
3 Copyright (C) 2001, 2003, 2006 Free Software Foundation, Inc.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #define SIZE_BITS (sizeof (size_t) * CHAR_BIT)
26 /* A hash function for NUL-terminated char* strings using
27 the method described by Bruno Haible.
28 See http://www.haible.de/bruno/hashfunc.html. */
31 hash_pjw (const void *x, size_t tablesize)
37 h = *s + ((h << 9) | (h >> (SIZE_BITS - 9)));