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70 lines
2.0 KiB
Plaintext
70 lines
2.0 KiB
Plaintext
/*
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* halflen - determine the length of numeric value in HALFs
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*
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* Copyright (C) 1999 Landon Curt Noll
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*
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* Calc is open software; you can redistribute it and/or modify it under
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* the terms of the version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* Calc is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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* Public License for more details.
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*
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* A copy of version 2.1 of the GNU Lesser General Public License is
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* distributed with calc under the filename COPYING-LGPL. You should have
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* received a copy with calc; if not, write to Free Software Foundation, Inc.
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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*
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* @(#) $Revision: 29.1 $
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* @(#) $Id: halflen.cal,v 29.1 1999/12/14 09:15:37 chongo Exp $
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* @(#) $Source: /usr/local/src/cmd/calc/custom/RCS/halflen.cal,v $
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*
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* Under source code control: 1997/03/08 20:51:32
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* File existed as early as: 1997
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*
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* chongo <was here> /\oo/\ http://reality.sgi.com/chongo/
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* Share and enjoy! :-) http://reality.sgi.com/chongo/tech/comp/calc/
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*/
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/*
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* This file is part of the custom sample calc files.
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*
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* NOTE: You must use a calc that was compiled with ALLOW_CUSTOM= -DCUSTOM
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* and run with a -C arg.
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*/
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define halflen(num)
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{
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local baseb = custom("sysinfo","BASEB"); /* bit len of a HALF */
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/*
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* firewall
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*/
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if (!isnum(num)) {
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return newerror("halflen only works on numeric values");
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}
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/*
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* determine the HALF length of a numeric value
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*/
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if (num == 0) {
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/* consider 0 to be 1 HALF long */
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return 1;
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} else if (isint(num)) {
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return (highbit(num)+baseb-1)/baseb;
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} else if (isreal(num)) {
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return halflen(num(num)) + halflen(den(num));
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} else if (isnum(num)) {
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return halflen(re(num)) + halflen(im(num));
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} else {
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return newerror("halflen only works on numeric values");
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}
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}
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if (config("resource_debug") >= 0) {
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print "halflen(num) defined";
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}
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