./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
./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
./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
./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
SUBDIR= adventure arithmetic \
banner bcd \
- colorbars \
+ colorbars caesar \
factor fish fortune \
monop morse number \
pig ppt primes \
--- /dev/null
+# $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>
--- /dev/null
+.\" $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.
--- /dev/null
+/* $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;
+}
--- /dev/null
+#!/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 "$@"