3 # Copyright (c) 1989, 1993
4 # The Regents of the University of California. All rights reserved.
6 # This code is derived from software contributed to Berkeley by
9 # Redistribution and use in source and binary forms, with or without
10 # modification, are permitted provided that the following conditions
12 # 1. Redistributions of source code must retain the above copyright
13 # notice, this list of conditions and the following disclaimer.
14 # 2. Redistributions in binary form must reproduce the above copyright
15 # notice, this list of conditions and the following disclaimer in the
16 # documentation and/or other materials provided with the distribution.
17 # 3. All advertising materials mentioning features or use of this software
18 # must display the following acknowledgement:
19 # This product includes software developed by the University of
20 # California, Berkeley and its contributors.
21 # 4. Neither the name of the University nor the names of its contributors
22 # may be used to endorse or promote products derived from this software
23 # without specific prior written permission.
25 # THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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34 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 # @(#)ack.m4 8.1 (Berkeley) 6/6/93
40 define(ack, `ifelse($1,0,incr($2),$2,0,`ack(DECR($1),1)',
41 `ack(DECR($1), ack($1,DECR($2)))')')