usr/src/games/ching/cno/ching.cno.c

/*
 * Copyright (c) 1988 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 are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1988 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)ching.cno.c 5.1 (Berkeley) %G%";
#endif /* not lint */

/*
 * cno - Read a question, cast a change, and output the line values to the
 * standard output for processing by "phx".
 */
#include <stdio.h>
#include "ching.h"

long    now;            /* current time */

unsigned seed;          /* seed for random number generator */
unsigned getrand();

char    *change();
char    string[6+1];    /* where the actual change string is put */

int     table[2][2][2] = {
        { { OYIN,  YYANG,}, { YYANG, YYIN,} },
        { { YYANG, YYIN,},  { YYIN,  OYANG,} },
};

main()
{
        FILE *logf;

        time(&now);
        seed = (int)now + getquest() + getgid() + getuid() + getpid();  /* randomize */
        printf("%s\n", change());
        if ((logf = fopen("log", "a")) != (FILE *)NULL) {
                fprintf(logf, "%s\t%s", string, ctime(&now));
                fclose(logf);
        }
}

/*
 * Hash the question by adding all the characters together.
 */
int
getquest()
{
        int result;
        register int c;

        result = 0;
        while ((c = getchar()) != EOF)
                result += c;
        return(result);
}

/*
 * Get a set of six lines making up a change.
 */
char *
change()
{
        register 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.
 */
getrnum()
{
        return((getrand())>>(getrand()%17));
}

/*
 * Get a random number.
 */
unsigned
getrand()
{
        return(seed = (seed*13077) + 6925);
}