3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Guy Harris at Network Appliance Corp.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 static const char copyright[] =
36 "@(#) Copyright (c) 1994\n\
37 The Regents of the University of California. All rights reserved.\n";
41 static const char sccsid[] = "@(#)random.c 8.5 (Berkeley) 4/5/94";
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
47 #include <sys/types.h>
62 #include "randomize_fd.h"
64 static void usage(void);
67 main(int argc, char *argv[])
70 int ch, fd, random_exit, randomize_lines, random_type, ret,
71 unique_output, unbuffer_output;
77 filename = "/dev/fd/0";
78 random_type = RANDOM_TYPE_UNSET;
79 random_exit = randomize_lines = unbuffer_output = 0;
82 (void)setlocale(LC_CTYPE, "");
84 while ((ch = getopt(argc, argv, "ef:hlruUw")) != -1)
91 if (strcmp(optarg, "-") != 0)
96 random_type = RANDOM_TYPE_LINES;
111 random_type = RANDOM_TYPE_WORDS;
124 denom = (randomize_lines ? 1. : 2.);
128 denom = strtod(*argv, &ep);
131 if (denom < 1. || *ep != '\0')
132 errx(1, "denominator is not valid.");
133 if (random_exit && denom > 256.)
134 errx(1, "denominator must be <= 256 for random exit.");
142 * Act as a filter, randomly choosing lines of the standard input
143 * to write to the standard output.
146 setbuf(stdout, NULL);
149 * Act as a filter, randomizing lines read in from a given file
150 * descriptor and write the output to standard output.
152 if (randomize_lines) {
153 if ((fd = open(filename, O_RDONLY, 0)) < 0)
154 err(1, "%s", filename);
155 ret = randomize_fd(fd, random_type, unique_output, denom);
160 /* Compute a random exit status between 0 and denom - 1. */
162 return (arc4random_uniform(denom));
165 * Filter stdin, selecting lines with probability 1/denom, one
166 * character at a time.
169 selected = random_uniform_denom(denom);
171 while ((ch = getchar()) != EOF) {
177 while ((ch = getchar()) != EOF)
193 fprintf(stderr, "usage: random [-elrUuw] [-f filename] [denominator]\n");