1# $OpenBSD: sqroot.m4,v 1.3 2003/06/03 02:56:11 millert Exp $ 2# $NetBSD: sqroot.m4,v 1.4 1995/09/28 05:38:01 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 35define(square_root, 36 `ifelse(eval($1<0),1,negative-square-root, 37 `square_root_aux($1, 1, eval(($1+1)/2))')') 38define(square_root_aux, 39 `ifelse($3, $2, $3, 40 $3, eval($1/$2), $3, 41 `square_root_aux($1, $3, eval(($3+($1/$3))/2))')') 42