1# $NetBSD: sqroot.m4,v 1.4 1995/09/28 05:38:01 tls Exp $ 2# 3# Copyright (c) 1989, 1993 4# The Regents of the University of California. All rights reserved. 5# 6# This code is derived from software contributed to Berkeley by 7# Ozan Yigit. 8# 9# Redistribution and use in source and binary forms, with or without 10# modification, are permitted provided that the following conditions 11# are met: 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. 24# 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 28# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35# SUCH DAMAGE. 36# 37# @(#)sqroot.m4 8.1 (Berkeley) 6/6/93 38# 39 40define(square_root, 41 `ifelse(eval($1<0),1,negative-square-root, 42 `square_root_aux($1, 1, eval(($1+1)/2))')') 43define(square_root_aux, 44 `ifelse($3, $2, $3, 45 $3, eval($1/$2), $3, 46 `square_root_aux($1, $3, eval(($3+($1/$3))/2))')') 47