#!/usr/bin/calc -q -s -f
/*
* fproduct - write the big Endian product of terms to a file
*
* usage:
* fproduct filename term [term ...]
*
* filename where to write the product, use - for stdout
* term ... terms to multiply
*
* Copyright (C) 2001,2014 Landon Curt Noll
*
* Calc is open software; you can redistribute it and/or modify it under
* the terms of the version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* Calc is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
* Public License for more details.
*
* A copy of version 2.1 of the GNU Lesser General Public License is
* distributed with calc under the filename COPYING-LGPL. You should have
* received a copy with calc; if not, write to Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Under source code control: 2001/04/07 20:13:11
* File existed as early as: 2001
*
* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
*/
/*
* parse args
*/
argc = argv();
if (argc < 2) {
fprintf(files(2), "usage: %s term [term ...]\n", argv(0));
exit;
}
filename = argv(1);
/*
* build the product
*/
product = 1;
for (i=2; i < argc; ++i) {
product *= eval(argv(i));
}
product = abs(product);
/*
* open the file for writing, "-" is stdout
*/
if (filename == "-") {
fd = files(1);
} else {
fd = fopen(filename, "w");
if (!isfile(fd)) quit "be2file: cannot open file for writing";
}
/*
* write the octets to the file
*
* The most significant bits of the integer become the first file octets.
*/
if (product > 0) {
octlen = int((highbit(product)+8) / 8);
for (i=octlen-1; i >= 0; --i) {
fputc(fd, char(product >> (i*8)));
}
}
/*
* cleanup
*/
if (filename != "-") {
fclose(fd);
}
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