135 lines
3.7 KiB
C
135 lines
3.7 KiB
C
/* $NetBSD: castching.c,v 1.1 2005/06/30 13:30:33 perry Exp $ */
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/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Guy Harris.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1988, 1993\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)ching.cno.c 8.1 (Berkeley) 5/31/93";
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#else
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__RCSID("$NetBSD: castching.c,v 1.1 2005/06/30 13:30:33 perry Exp $");
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#endif
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#endif /* not lint */
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/*
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* castching - Read a question, cast a change, and output the line
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* values to the standard output for processing by "printching".
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#include "ching.h"
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time_t now; /* current time */
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unsigned seed; /* seed for random number generator */
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int getquest(void);
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unsigned getrand(void);
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unsigned getrnum(void);
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char *change(void);
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char string[6+1]; /* where the actual change string is put */
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int table[2][2][2] = {
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{ { OYIN, YYANG,}, { YYANG, YYIN,} },
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{ { YYANG, YYIN,}, { YYIN, OYANG,} },
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};
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/*ARGSUSED*/
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int
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main(int argc, char **argv)
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{
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time(&now);
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/* randomize */
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seed = (int)now + getquest() + getgid() + getuid() + getpid();
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printf("%s\n", change());
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exit(0);
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}
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/*
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* Hash the question by adding all the characters together.
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*/
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int
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getquest(void)
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{
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int result;
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int c;
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result = 0;
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while ((c = getchar()) != EOF)
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result += c;
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return(result);
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}
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/*
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* Get a set of six lines making up a change.
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*/
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char *
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change(void)
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{
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int i;
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for (i = 0; i < 6; i++)
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string[i] = table[getrnum()&01][getrnum()&01][getrnum()&01] + '0';
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string[i] = '\0';
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return(string);
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}
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/*
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* Get a number more random than what getrand() gives.
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*/
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unsigned
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getrnum(void)
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{
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return((getrand())>>(getrand()%17));
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}
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/*
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* Get a random number.
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*/
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unsigned
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getrand(void)
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{
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return(seed = (seed*13077) + 6925);
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}
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