Import games/caesar and games/rot13

Change-Id: Ib6b074c6c525ee817b9182b17a06ae18851f5afe

distrib/sets/lists/minix/mi

@@ -623,8 +623,9 @@
 ./usr/games				minix-sys
 ./usr/games/adventure			minix-sys
 ./usr/games/arithmetic			minix-sys
-./usr/games/bcd				minix-sys
 ./usr/games/banner			minix-sys
+./usr/games/bcd				minix-sys
+./usr/games/caesar			minix-sys
 ./usr/games/colorbars			minix-sys
 ./usr/games/factor			minix-sys
 ./usr/games/fish			minix-sys
@@ -639,6 +640,7 @@
 ./usr/games/rain			minix-sys
 ./usr/games/random			minix-sys
 ./usr/games/rogue			minix-sys
+./usr/games/rot13			minix-sys
 ./usr/games/snake			minix-sys
 ./usr/games/snscore			minix-sys
 ./usr/games/strfile			minix-sys
@@ -5166,8 +5168,9 @@
 ./usr/man/man6					minix-sys
 ./usr/man/man6/adventure.6			minix-sys
 ./usr/man/man6/arithmetic.6			minix-sys
-./usr/man/man6/bcd.6				minix-sys
 ./usr/man/man6/banner.6				minix-sys
+./usr/man/man6/bcd.6				minix-sys
+./usr/man/man6/caesar.6				minix-sys
 ./usr/man/man6/colorbars.6			minix-sys
 ./usr/man/man6/factor.6				minix-sys
 ./usr/man/man6/fish.6				minix-sys
@@ -5181,6 +5184,7 @@
 ./usr/man/man6/rain.6				minix-sys
 ./usr/man/man6/random.6				minix-sys
 ./usr/man/man6/rogue.6				minix-sys
+./usr/man/man6/rot13.6				minix-sys
 ./usr/man/man6/snake.6				minix-sys
 ./usr/man/man6/tetris.6				minix-sys
 ./usr/man/man6/wargames.6			minix-sys

games/Makefile

@@ -9,7 +9,7 @@
 
 SUBDIR=	adventure arithmetic \
 	banner bcd \
-	colorbars \
+	colorbars caesar \
 	factor fish fortune \
 	monop morse number \
 	pig ppt primes \

games/caesar/Makefile

@@ -0,0 +1,11 @@
+#	$NetBSD: Makefile,v 1.8 2008/01/28 07:03:59 dholland Exp $
+#	@(#)Makefile	8.1 (Berkeley) 5/31/93
+
+PROG=	caesar
+MAN=	caesar.6
+DPADD=	${LIBM}
+LDADD=	-lm
+MLINKS=	caesar.6 rot13.6
+SCRIPTS=rot13.sh
+
+.include <bsd.prog.mk>

games/caesar/caesar.6

@@ -0,0 +1,72 @@
+.\"	$NetBSD: caesar.6,v 1.9 2003/08/07 09:37:07 agc Exp $
+.\"
+.\" Copyright (c) 1989, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" 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. 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.
+.\"
+.\"	@(#)caesar.6	8.2 (Berkeley) 11/16/93
+.\"
+.Dd November 16, 1993
+.Dt CAESAR 6
+.Os
+.Sh NAME
+.Nm caesar ,
+.Nm rot13
+.Nd decrypt caesar ciphers
+.Sh SYNOPSIS
+.Nm
+.Op Ar rotation
+.Sh DESCRIPTION
+The
+.Nm
+utility attempts to decrypt caesar ciphers using English letter frequency
+statistics.
+.Nm
+reads from the standard input and writes to the standard output.
+.Pp
+The optional numerical argument
+.Ar rotation
+may be used to specify a specific rotation value.
+.Pp
+The frequency (from most common to least) of English letters is as follows:
+.Pp
+.Bd -filled -offset indent
+ETAONRISHDLFCMUGPYWBVKXJQZ
+.Ed
+.Pp
+Their frequencies as a percentage are as follows:
+.Pp
+.Bd -filled -offset indent
+E(13), T(10.5), A(8.1), O(7.9), N(7.1), R(6.8), I(6.3), S(6.1), H(5.2),
+D(3.8), L(3.4), F(2.9), C(2.7), M(2.5), U(2.4), G(2),
+P(1.9), Y(1.9), W(1.5), B(1.4), V(.9), K(.4), X(.15), J(.13), Q(.11), Z(.07).
+.Ed
+.Pp
+Rotated postings to
+.Tn USENET
+and some of the databases used by the
+.Xr fortune 6
+program are rotated by 13 characters.

games/caesar/caesar.c

@@ -0,0 +1,218 @@
+/*	$NetBSD: caesar.c,v 1.22 2008/07/20 01:03:21 lukem Exp $	*/
+
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Rick Adams.
+ *
+ * Authors:
+ *	Stan King, John Eldridge, based on algorithm suggested by
+ *	Bob Morris
+ * 29-Sep-82
+ *      Roland Illig, 2005
+ *
+ * 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. 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) 1989, 1993\
+ The Regents of the University of California.  All rights reserved.");
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)caesar.c	8.1 (Berkeley) 5/31/93";
+#else
+__RCSID("$NetBSD: caesar.c,v 1.22 2008/07/20 01:03:21 lukem Exp $");
+#endif
+#endif /* not lint */
+
+#include <err.h>
+#include <errno.h>
+#include <limits.h>
+#include <math.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define NCHARS			(1 << CHAR_BIT)
+#define LETTERS			(26)
+
+/*
+ * letter frequencies (taken from some unix(tm) documentation)
+ * (unix is a trademark of Bell Laboratories)
+ */
+static const unsigned char upper[LETTERS] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+static const unsigned char lower[LETTERS] = "abcdefghijklmnopqrstuvwxyz";
+static double stdf[LETTERS] = {
+	7.97, 1.35, 3.61, 4.78, 12.37, 2.01, 1.46, 4.49, 6.39, 0.04,
+	0.42, 3.81, 2.69, 5.92,  6.96, 2.91, 0.08, 6.63, 8.77, 9.68,
+	2.62, 0.81, 1.88, 0.23,  2.07, 0.06
+};
+
+static unsigned char rottbl[NCHARS];
+
+
+static void
+init_rottbl(int rot)
+{
+	size_t i;
+
+	rot %= LETTERS;		/* prevent integer overflow */
+
+	for (i = 0; i < NCHARS; i++)
+		rottbl[i] = (unsigned char)i;
+
+	for (i = 0; i < LETTERS; i++)
+		rottbl[upper[i]] = upper[(i + rot) % LETTERS];
+
+	for (i = 0; i < LETTERS; i++)
+		rottbl[lower[i]] = lower[(i + rot) % LETTERS];
+}
+
+static void
+print_file(void)
+{
+	int ch;
+
+	while ((ch = getchar()) != EOF) {
+		if (putchar(rottbl[ch]) == EOF) {
+			err(EXIT_FAILURE, "<stdout>");
+			/* NOTREACHED */
+		}
+	}
+}
+
+static void
+print_array(const unsigned char *a, size_t len)
+{
+	size_t i;
+
+	for (i = 0; i < len; i++) {
+		if (putchar(rottbl[a[i]]) == EOF) {
+			err(EXIT_FAILURE, "<stdout>");
+			/* NOTREACHED */
+		}
+	}
+}
+
+static int
+get_rotation(const char *arg)
+{
+	long rot;
+	char *endp;
+
+	errno = 0;
+	rot = strtol(arg, &endp, 10);
+	if (errno == 0 && (arg[0] == '\0' || *endp != '\0'))
+		errno = EINVAL;
+	if (errno == 0 && (rot < 0 || rot > INT_MAX))
+		errno = ERANGE;
+	if (errno)
+		err(EXIT_FAILURE, "Bad rotation value `%s'", arg);
+	return (int)rot;
+}
+
+static void
+guess_and_rotate(void)
+{
+	unsigned char inbuf[2048];
+	unsigned int obs[NCHARS];
+	size_t i, nread;
+	double dot, winnerdot;
+	int try, winner;
+	int ch;
+
+	/* adjust frequency table to weight low probs REAL low */
+	for (i = 0; i < LETTERS; i++)
+		stdf[i] = log(stdf[i]) + log(LETTERS / 100.0);
+
+	/* zero out observation table */
+	(void)memset(obs, 0, sizeof(obs));
+
+	for (nread = 0; nread < sizeof(inbuf); nread++) {
+		if ((ch = getchar()) == EOF)
+			break;
+		inbuf[nread] = (unsigned char) ch;
+	}
+
+	for (i = 0; i < nread; i++)
+		obs[inbuf[i]]++;
+
+	/*
+	 * now "dot" the freqs with the observed letter freqs
+	 * and keep track of best fit
+	 */
+	winner = 0;
+	winnerdot = 0.0;
+	for (try = 0; try < LETTERS; try++) {
+		dot = 0.0;
+		for (i = 0; i < LETTERS; i++)
+			dot += (obs[upper[i]] + obs[lower[i]])
+			     * stdf[(i + try) % LETTERS];
+
+		if (try == 0 || dot > winnerdot) {
+			/* got a new winner! */
+			winner = try;
+			winnerdot = dot;
+		}
+	}
+
+	init_rottbl(winner);
+	print_array(inbuf, nread);
+	print_file();
+}
+
+int
+main(int argc, char **argv)
+{
+
+	if (argc == 1) {
+		guess_and_rotate();
+	} else if (argc == 2) {
+		init_rottbl(get_rotation(argv[1]));
+		print_file();
+	} else {
+		(void)fprintf(stderr, "usage: caesar [rotation]\n");
+		exit(EXIT_FAILURE);
+		/* NOTREACHED */
+	}
+
+	if (ferror(stdin)) {
+		errx(EXIT_FAILURE, "<stdin>");
+		/* NOTREACHED */
+	}
+
+	(void)fflush(stdout);
+	if (ferror(stdout)) {
+		errx(EXIT_FAILURE, "<stdout>");
+		/* NOTREACHED */
+	}
+
+	return 0;
+}

games/caesar/rot13.sh

@@ -0,0 +1,39 @@
+#!/bin/sh -
+#	$NetBSD: rot13.sh,v 1.7 2005/04/09 02:02:15 atatat Exp $
+#
+# Copyright (c) 1992, 1993
+#	The Regents of the University of California.  All rights reserved.
+#
+# 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.
+#
+#	@(#)rot13.sh	8.1 (Berkeley) 5/31/93
+#
+
+games="$(dirname $0)"
+exec "$games/caesar" 13 "$@"