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89 lines
2.2 KiB
Plaintext
89 lines
2.2 KiB
Plaintext
#!/usr/local/src/cmd/calc/calc -q -s -f
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/*
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* fproduct - write the big Endian product of terms to a file
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*
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* usage:
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* fproduct filename term [term ...]
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*
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* filename where to write the product, use - for stdout
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* term ... terms to multiply
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*
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* Copyright (C) 2001 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: 29.2 $
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* @(#) $Id: fproduct.calc,v 29.2 2001/06/06 09:06:29 chongo Exp $
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* @(#) $Source: /usr/local/src/cmd/calc/cscript/RCS/fproduct.calc,v $
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*
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* Under source code control: 2001/04/07 20:13:11
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* File existed as early as: 2001
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*
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* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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*/
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/*
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* parse args
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*/
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argc = argv();
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if (argc < 2) {
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fprintf(files(2), "usage: %s term [term ...]\n", argv(0));
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exit;
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}
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filename = argv(1);
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/*
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* build the product
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*/
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product = 1;
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for (i=2; i < argc; ++i) {
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product *= eval(argv(i));
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}
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product = abs(product);
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/*
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* open the file for writing, "-" is stdout
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*/
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if (filename == "-") {
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fd = files(1);
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} else {
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fd = fopen(filename, "w");
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if (!isfile(fd)) quit "be2file: cannot open file for writing";
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}
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/*
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* write the octets to the file
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*
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* The most significant bits of the integer become the first file octets.
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*/
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if (product > 0) {
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octlen = int((highbit(product)+8) / 8);
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for (i=octlen-1; i >= 0; --i) {
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fputc(fd, char(product >> (i*8)));
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}
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}
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/*
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* cleanup
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*/
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if (filename != "-") {
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fclose(fd);
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}
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