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Import games/caesar and games/rot13

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Change-Id: Ib6b074c6c525ee817b9182b17a06ae18851f5afe
This commit is contained in:
Jacob Adams 2015-04-04 22:26:08 -04:00 committed by Lionel Sambuc
parent f1489796fd
commit 9cf6cc5098
6 changed files with 347 additions and 3 deletions
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8
distrib/sets/lists/minix/mi
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@ -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

2
games/Makefile
View file

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

11
games/caesar/Makefile Normal file
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@ -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>

72
games/caesar/caesar.6 Normal file
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@ -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.

218
games/caesar/caesar.c Normal file
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@ -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;
}

39
games/caesar/rot13.sh Normal file
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@ -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 "$@"