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[dragonfly.git] / games / random / random.c
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6693db17 1/*-
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2 * Copyright (c) 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Guy Harris at Network Appliance Corp.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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.
6693db17 16 * 3. Neither the name of the University nor the names of its contributors
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17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
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
30 * SUCH DAMAGE.
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31 *
32 * @(#) Copyright (c) 1994 The Regents of the University of California. All rights reserved.
33 * @(#)random.c 8.5 (Berkeley) 4/5/94
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34 * $FreeBSD: src/games/random/random.c,v 1.17 2005/02/09 18:22:15 ru Exp $
35 * $DragonFly: src/games/random/random.c,v 1.4 2005/03/02 06:59:23 cpressey Exp $
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36 */
37
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38#include <sys/types.h>
39
40#include <err.h>
41#include <errno.h>
42#include <fcntl.h>
43#include <limits.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47#include <time.h>
48#include <unistd.h>
49
50#include "randomize_fd.h"
51
52static void usage(void);
53
54int
55main(int argc, char *argv[])
56{
57 double denom;
58 int ch, fd, random_exit, randomize_lines, random_type, ret,
59 selected, unique_output, unbuffer_output;
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60 char *ep;
61 const char *filename;
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62
63 denom = 0;
b8a2ba94 64 filename = "/dev/fd/0";
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65 random_type = RANDOM_TYPE_UNSET;
66 random_exit = randomize_lines = random_type = unbuffer_output = 0;
67 unique_output = 1;
68 while ((ch = getopt(argc, argv, "ef:hlruUw")) != -1)
69 switch (ch) {
70 case 'e':
71 random_exit = 1;
72 break;
73 case 'f':
74 randomize_lines = 1;
b8a2ba94 75 if (strcmp(optarg, "-") != 0)
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76 filename = optarg;
77 break;
78 case 'l':
79 randomize_lines = 1;
80 random_type = RANDOM_TYPE_LINES;
81 break;
82 case 'r':
83 unbuffer_output = 1;
84 break;
85 case 'u':
86 randomize_lines = 1;
87 unique_output = 1;
88 break;
89 case 'U':
90 randomize_lines = 1;
91 unique_output = 0;
92 break;
93 case 'w':
94 randomize_lines = 1;
95 random_type = RANDOM_TYPE_WORDS;
96 break;
97 default:
98 case '?':
99 usage();
100 /* NOTREACHED */
101 }
102
103 argc -= optind;
104 argv += optind;
105
106 switch (argc) {
107 case 0:
108 denom = (randomize_lines ? 1 : 2);
109 break;
110 case 1:
111 errno = 0;
112 denom = strtod(*argv, &ep);
113 if (errno == ERANGE)
114 err(1, "%s", *argv);
115 if (denom <= 0 || *ep != '\0')
116 errx(1, "denominator is not valid.");
117 if (random_exit && denom > 255)
118 errx(1, "denominator must be <= 255 for random exit.");
119 break;
120 default:
121 usage();
122 /* NOTREACHED */
123 }
124
125 srandomdev();
126
127 /*
128 * Act as a filter, randomly choosing lines of the standard input
129 * to write to the standard output.
130 */
131 if (unbuffer_output)
132 setbuf(stdout, NULL);
133
134 /*
135 * Act as a filter, randomizing lines read in from a given file
136 * descriptor and write the output to standard output.
137 */
138 if (randomize_lines) {
139 if ((fd = open(filename, O_RDONLY, 0)) < 0)
140 err(1, "%s", filename);
141 ret = randomize_fd(fd, random_type, unique_output, denom);
142 if (!random_exit)
143 return(ret);
144 }
145
146 /* Compute a random exit status between 0 and denom - 1. */
147 if (random_exit)
148 return (int)((denom * random()) / LONG_MAX);
149
150 /*
151 * Select whether to print the first line. (Prime the pump.)
152 * We find a random number between 0 and denom - 1 and, if it's
153 * 0 (which has a 1 / denom chance of being true), we select the
154 * line.
155 */
156 selected = (int)(denom * random() / LONG_MAX) == 0;
157 while ((ch = getchar()) != EOF) {
158 if (selected)
159 (void)putchar(ch);
160 if (ch == '\n') {
161 /* End of that line. See if we got an error. */
162 if (ferror(stdout))
163 err(2, "stdout");
164
165 /* Now see if the next line is to be printed. */
166 selected = (int)(denom * random() / LONG_MAX) == 0;
167 }
168 }
169 if (ferror(stdin))
170 err(2, "stdin");
171 exit (0);
172}
173
174static void
175usage(void)
176{
177
ad051b28 178 fprintf(stderr, "usage: random [-elrUuw] [-f filename] [denominator]\n");
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179 exit(1);
180}