1# $OpenBSD: hash.m4,v 1.3 2003/06/03 02:56:11 millert Exp $ 2# $NetBSD: hash.m4,v 1.4 1995/09/28 05:37:58 tls Exp $ 3# 4# Copyright (c) 1989, 1993 5# The Regents of the University of California. All rights reserved. 6# 7# This code is derived from software contributed to Berkeley by 8# Ozan Yigit. 9# 10# Redistribution and use in source and binary forms, with or without 11# modification, are permitted provided that the following conditions 12# are met: 13# 1. Redistributions of source code must retain the above copyright 14# notice, this list of conditions and the following disclaimer. 15# 2. Redistributions in binary form must reproduce the above copyright 16# notice, this list of conditions and the following disclaimer in the 17# documentation and/or other materials provided with the distribution. 18# 3. Neither the name of the University nor the names of its contributors 19# may be used to endorse or promote products derived from this software 20# without specific prior written permission. 21# 22# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32# SUCH DAMAGE. 33# 34# @(#)hash.m4 8.1 (Berkeley) 6/6/93 35# 36 37dnl This probably will not run on any m4 that cannot 38dnl handle char constants in eval. 39dnl 40changequote(<,>) define(HASHVAL,99) dnl 41define(hash,<eval(str(substr($1,1),0)%HASHVAL)>) dnl 42define(str, 43 <ifelse($1,",$2, 44 <str(substr(<$1>,1),<eval($2+'substr($1,0,1)')>)>) 45 >) dnl 46define(KEYWORD,<$1,hash($1),>) dnl 47define(TSTART, 48<struct prehash { 49 char *keyword; 50 int hashval; 51} keytab[] = {>) dnl 52define(TEND,< "",0 53};>) dnl 54