prng.c
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上传日期:2007-01-12
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文件大小:2k
- /*
- * prng.c
- *
- * Command-line pseudo-random number generator
- *
- * The contents of this file are subject to the Mozilla Public
- * License Version 1.1 (the "License"); you may not use this file
- * except in compliance with the License. You may obtain a copy of
- * the License at http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS
- * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- * implied. See the License for the specific language governing
- * rights and limitations under the License.
- *
- * The Original Code is the MPI Arbitrary Precision Integer Arithmetic
- * library.
- *
- * The Initial Developer of the Original Code is Michael J. Fromberger.
- * Portions created by Michael J. Fromberger are
- * Copyright (C) 1998, 1999, 2000 Michael J. Fromberger.
- * All Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL"), in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your
- * version of this file only under the terms of the GPL and not to
- * allow others to use your version of this file under the MPL,
- * indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient
- * may use your version of this file under either the MPL or the GPL.
- *
- * $Id: prng.c,v 1.1 2000/07/14 00:45:01 nelsonb%netscape.com Exp $
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <limits.h>
- #include <time.h>
- #include <unistd.h>
- #include "bbs_rand.h"
- int main(int argc, char *argv[])
- {
- unsigned char *seed;
- unsigned int ix, num = 1;
- pid_t pid;
-
- if(argc > 1) {
- num = atoi(argv[1]);
- if(num <= 0)
- num = 1;
- }
- pid = getpid();
- srand(time(NULL) * (unsigned int)pid);
- /* Not a perfect seed, but not bad */
- seed = malloc(bbs_seed_size);
- for(ix = 0; ix < bbs_seed_size; ix++) {
- seed[ix] = rand() % UCHAR_MAX;
- }
- bbs_srand(seed, bbs_seed_size);
- memset(seed, 0, bbs_seed_size);
- free(seed);
- while(num-- > 0) {
- ix = bbs_rand();
- printf("%un", ix);
- }
- return 0;
- }