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Diffstat (limited to 'ching/castching/castching.c')
| -rw-r--r-- | ching/castching/castching.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/ching/castching/castching.c b/ching/castching/castching.c new file mode 100644 index 00000000..e0f767c4 --- /dev/null +++ b/ching/castching/castching.c @@ -0,0 +1,134 @@ +/* $NetBSD: castching.c,v 1.1 2005/06/30 13:30:33 perry 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\n\ + The Regents of the University of California. All rights reserved.\n"); +#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 1.1 2005/06/30 13:30:33 perry 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" + +time_t now; /* current time */ + +unsigned seed; /* seed for random number generator */ +int getquest(void); +unsigned getrand(void); +unsigned getrnum(void); +char *change(void); + +char string[6+1]; /* where the actual change string is put */ + +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. + */ +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. + */ +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. + */ +unsigned +getrnum(void) +{ + return((getrand())>>(getrand()%17)); +} + +/* + * Get a random number. + */ +unsigned +getrand(void) +{ + return(seed = (seed*13077) + 6925); +} |