NetBSD/lib/libcurses/cur_hash.c

66 lines
2.2 KiB
C

/* $NetBSD: cur_hash.c,v 1.12 2005/02/18 22:16:27 dsl Exp $ */
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)cur_hash.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: cur_hash.c,v 1.12 2005/02/18 22:16:27 dsl Exp $");
#endif
#endif /* not lint */
#include <sys/types.h>
#include "curses.h"
#include "curses_private.h"
/*
* __hash_more() is "hashpjw" from the Dragon Book, Aho, Sethi & Ullman, p.436.
*/
u_int
__hash_more(const void *v_s, size_t len, u_int h)
{
u_int g;
size_t i = 0;
const char *s = v_s;
while (i < len) {
h = (h << 4) + s[i];
if ((g = h & 0xf0000000) != 0) {
h = h ^ (g >> 24);
h = h ^ g;
}
i++;
}
return h;
}