xref: /freebsd/usr.bin/m4/TEST/hash.m4 (revision 4b9d6057)
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
35dnl	This probably will not run on any m4 that cannot
36dnl	handle char constants in eval.
37dnl
38changequote(<,>) define(HASHVAL,99) dnl
39define(hash,<eval(str(substr($1,1),0)%HASHVAL)>) dnl
40define(str,
41	<ifelse($1,",$2,
42		<str(substr(<$1>,1),<eval($2+'substr($1,0,1)')>)>)
43	>) dnl
44define(KEYWORD,<$1,hash($1),>) dnl
45define(TSTART,
46<struct prehash {
47	char *keyword;
48	int   hashval;
49} keytab[] = {>) dnl
50define(TEND,<	"",0
51};>) dnl
52