m4: Sync with FreeBSD.
[dragonfly.git] / usr.bin / m4 / TEST / ack.m4
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1# $OpenBSD: ack.m4,v 1.2 1996/06/26 05:36:18 deraadt Exp $
2# $NetBSD: ack.m4,v 1.4 1995/09/28 05:37:54 tls Exp $
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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.
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18# 4. 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#
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34# $FreeBSD: src/usr.bin/m4/TEST/ack.m4,v 1.3 2012/11/17 01:54:24 svnexp Exp $
35#
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36# @(#)ack.m4 8.1 (Berkeley) 6/6/93
37#
38
39define(ack, `ifelse($1,0,incr($2),$2,0,`ack(DECR($1),1)',
40`ack(DECR($1), ack($1,DECR($2)))')')