136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
/* $NetBSD: castching.c,v 1.3 2009/08/12 05:40:03 dholland Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1988, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Guy Harris.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
__COPYRIGHT("@(#) Copyright (c) 1988, 1993\
|
|
The Regents of the University of California. All rights reserved.");
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
#if 0
|
|
static char sccsid[] = "@(#)ching.cno.c 8.1 (Berkeley) 5/31/93";
|
|
#else
|
|
__RCSID("$NetBSD: castching.c,v 1.3 2009/08/12 05:40:03 dholland Exp $");
|
|
#endif
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* castching - Read a question, cast a change, and output the line
|
|
* values to the standard output for processing by "printching".
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
#include "ching.h"
|
|
|
|
static time_t now; /* current time */
|
|
|
|
static unsigned seed; /* seed for random number generator */
|
|
|
|
static int getquest(void);
|
|
static unsigned getrand(void);
|
|
static unsigned getrnum(void);
|
|
static char *change(void);
|
|
|
|
static char string[6+1]; /* where the actual change string is put */
|
|
|
|
static int table[2][2][2] = {
|
|
{ { OYIN, YYANG,}, { YYANG, YYIN,} },
|
|
{ { YYANG, YYIN,}, { YYIN, OYANG,} },
|
|
};
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
time(&now);
|
|
/* randomize */
|
|
seed = (int)now + getquest() + getgid() + getuid() + getpid();
|
|
printf("%s\n", change());
|
|
exit(0);
|
|
}
|
|
|
|
/*
|
|
* Hash the question by adding all the characters together.
|
|
*/
|
|
static int
|
|
getquest(void)
|
|
{
|
|
int result;
|
|
int c;
|
|
|
|
result = 0;
|
|
while ((c = getchar()) != EOF)
|
|
result += c;
|
|
return(result);
|
|
}
|
|
|
|
/*
|
|
* Get a set of six lines making up a change.
|
|
*/
|
|
static char *
|
|
change(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 6; i++)
|
|
string[i] = table[getrnum()&01][getrnum()&01][getrnum()&01] + '0';
|
|
string[i] = '\0';
|
|
return(string);
|
|
}
|
|
|
|
/*
|
|
* Get a number more random than what getrand() gives.
|
|
*/
|
|
static unsigned
|
|
getrnum(void)
|
|
{
|
|
return((getrand())>>(getrand()%17));
|
|
}
|
|
|
|
/*
|
|
* Get a random number.
|
|
*/
|
|
static unsigned
|
|
getrand(void)
|
|
{
|
|
return(seed = (seed*13077) + 6925);
|
|
}
|