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/* lfib-stream.c
*
* Generates a pseudorandom stream, using the Knuth lfib
* (non-cryptographic) pseudorandom generator.
*
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2003 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library 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.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "knuth-lfib.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#define BUFSIZE 500
static void
usage(void)
{
fprintf(stderr, "Usage: lfib-stream [SEED]\n");
}
int
main(int argc, char **argv)
{
struct knuth_lfib_ctx ctx;
uint32_t seed;
if (argc == 1)
seed = time(NULL);
else if (argc == 2)
{
seed = atoi(argv[1]);
if (!seed)
{
usage();
return EXIT_FAILURE;
}
}
else
{
usage();
return EXIT_FAILURE;
}
knuth_lfib_init(&ctx, seed);
for (;;)
{
char buffer[BUFSIZE];
knuth_lfib_random(&ctx, BUFSIZE, buffer);
if (fwrite(buffer, 1, BUFSIZE, stdout) < BUFSIZE
|| fflush(stdout) < 0)
return EXIT_FAILURE;
}
/* Not reached. This program is usually terminated by SIGPIPE */
}
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