88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/* $NetBSD: cur_hash.c,v 1.14 2021/09/07 01:23:09 rin Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)cur_hash.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: cur_hash.c,v 1.14 2021/09/07 01:23:09 rin Exp $");
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include "curses.h"
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#include "curses_private.h"
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/*
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* __hash_more() is "hashpjw" from the Dragon Book, Aho, Sethi & Ullman, p.436.
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*/
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unsigned int
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__hash_more(const void *v_s, size_t len, unsigned int h)
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{
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unsigned int g;
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size_t i = 0;
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const char *s = v_s;
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while (i < len) {
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h = (h << 4) + s[i];
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if ((g = h & 0xf0000000) != 0) {
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h = h ^ (g >> 24);
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h = h ^ g;
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}
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i++;
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}
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return h;
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}
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unsigned int
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__hash_line(const __LDATA *cp, int ncols)
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{
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#ifdef HAVE_WCHAR
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unsigned int h;
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const nschar_t *np;
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int x;
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h = 0;
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for (x = 0; x < ncols; x++) {
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h = __hash_more(&cp->ch, sizeof(cp->ch), h);
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h = __hash_more(&cp->attr, sizeof(cp->attr), h);
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for (np = cp->nsp; np != NULL; np = np->next)
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h = __hash_more(&np->ch, sizeof(np->ch), h);
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cp++;
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}
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return h;
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#else
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return __hash(cp, (size_t)(ncols * __LDATASIZE));
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#endif
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}
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