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Initial revision
git-svn-id: file:///srv/svn/joey/bsdgames-trunk@5086 a4a2c43b-8ac3-0310-8836-e0e880c912e2
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joey
7
random/Makefile.bsd
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7
random/Makefile.bsd
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# $NetBSD: Makefile,v 1.3 1995/04/22 07:44:02 cgd Exp $
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# @(#)Makefile 8.1 (Berkeley) 3/31/94
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PROG= random
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MAN= random.6
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.include <bsd.prog.mk>
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10
random/Makefrag
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10
random/Makefrag
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# Makefrag - makefile fragment for random
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random_DIRS := $(GAMESDIR) $(MAN6DIR)
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random_all: random/random random/random.6
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random_install: random_all
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$(INSTALL_BINARY) random/random $(INSTALL_PREFIX)$(GAMESDIR)/random
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$(HIDE_GAME) random
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$(INSTALL_MANUAL) random/random.6
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71
random/random.6
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71
random/random.6
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.\" $NetBSD: random.6,v 1.3 1997/10/12 01:14:18 lukem Exp $
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.\"
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.\" Copyright (c) 1994
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)random.6 8.2 (Berkeley) 3/31/94
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.\"
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.Dd March 31, 1994
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.Dt RANDOM 6
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.Os BSD 4
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.Sh NAME
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.Nm random
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.Nd random lines from a file or random numbers
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.Sh SYNOPSIS
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.Nm
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.Op Fl er
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.Op Ar denominator
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.Sh DESCRIPTION
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.Nm
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reads lines from the standard input and copies them to the standard
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output with a probability of 1/denominator.
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The default value for
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.Ar denominator
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is 2.
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl e
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If the
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.Fl e
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option is specified,
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.Nm
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does not read or write anything, and simply exits with a random
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exit value of 0 to
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.Ar denominator
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\&- 1, inclusive.
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.It Fl r
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The
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.Fl r
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option guarantees that the output is unbuffered.
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.El
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.Sh SEE ALSO
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.Xr fortune 6
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160
random/random.c
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160
random/random.c
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/* $NetBSD: random.c,v 1.5 1997/10/12 01:14:22 lukem Exp $ */
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/*
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* Copyright (c) 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Guy Harris at Network Appliance Corp.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1994\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)random.c 8.6 (Berkeley) 6/1/94";
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#else
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__RCSID("$NetBSD: random.c,v 1.5 1997/10/12 01:14:22 lukem Exp $");
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/time.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#include <limits.h>
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int main __P((int, char **));
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void usage __P((void));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct timeval tp;
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double denom;
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int ch, random_exit, selected, unbuffer_output;
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char *ep;
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/* Revoke setgid privileges */
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setregid(getgid(), getgid());
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denom = 0;
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random_exit = unbuffer_output = 0;
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while ((ch = getopt(argc, argv, "er")) != -1)
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switch (ch) {
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case 'e':
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random_exit = 1;
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break;
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case 'r':
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unbuffer_output = 1;
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break;
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default:
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case '?':
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usage();
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/* NOTREACHED */
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}
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argc -= optind;
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argv += optind;
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switch (argc) {
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case 0:
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denom = 2;
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break;
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case 1:
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errno = 0;
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denom = strtod(*argv, &ep);
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if (errno == ERANGE)
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err(1, "%s", *argv);
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if (denom == 0 || *ep != '\0')
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errx(1, "denominator is not valid.");
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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(void)gettimeofday(&tp, NULL);
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srandom((u_int)(tp.tv_usec + tp.tv_sec + getpid()));
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/* Compute a random exit status between 0 and denom - 1. */
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if (random_exit)
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return ((denom * random()) / LONG_MAX);
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/*
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* Act as a filter, randomly choosing lines of the standard input
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* to write to the standard output.
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*/
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if (unbuffer_output)
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setbuf(stdout, NULL);
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/*
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* Select whether to print the first line. (Prime the pump.)
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* We find a random number between 0 and denom - 1 and, if it's
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* 0 (which has a 1 / denom chance of being true), we select the
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* line.
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*/
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selected = (int)(denom * random() / LONG_MAX) == 0;
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while ((ch = getchar()) != EOF) {
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if (selected)
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(void)putchar(ch);
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if (ch == '\n') {
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/* End of that line. See if we got an error. */
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if (ferror(stdout))
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err(2, "stdout");
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/* Now see if the next line is to be printed. */
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selected = (int)(denom * random() / LONG_MAX) == 0;
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}
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}
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if (ferror(stdin))
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err(2, "stdin");
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exit (0);
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: random [-er] [denominator]\n");
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exit(1);
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}
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