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      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 
     40 define(square_root, 
     41 	`ifelse(eval($1<0),1,negative-square-root,
     42 			     `square_root_aux($1, 1, eval(($1+1)/2))')')
     43 define(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