1 /*
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.
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.
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.
31 */
32
33 #if 0
34 #ifndef lint
35 static const char copyright[] =
36 "@(#) Copyright (c) 1994\n\
37 The Regents of the University of California. All rights reserved.\n";
38 #endif /* not lint */
39
40 #ifndef lint
41 static const char sccsid[] = "@(#)random.c 8.5 (Berkeley) 4/5/94";
42 #endif /* not lint */
43 #endif
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
46
47 #include <sys/types.h>
48
49 #include <err.h>
50 #include <errno.h>
51 #include <fcntl.h>
52 #include <limits.h>
53 #include <locale.h>
54 #include <stdbool.h>
55 #include <stdint.h>
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <string.h>
59 #include <time.h>
60 #include <unistd.h>
61
62 #include "randomize_fd.h"
63
64 static void usage(void);
65
66 int
main(int argc,char * argv[])67 main(int argc, char *argv[])
68 {
69 double denom;
70 int ch, fd, random_exit, randomize_lines, random_type, ret,
71 unique_output, unbuffer_output;
72 bool selected;
73 char *ep;
74 const char *filename;
75
76 denom = 0.;
77 filename = "/dev/fd/0";
78 random_type = RANDOM_TYPE_UNSET;
79 random_exit = randomize_lines = unbuffer_output = 0;
80 unique_output = 1;
81
82 (void)setlocale(LC_CTYPE, "");
83
84 while ((ch = getopt(argc, argv, "ef:hlruUw")) != -1)
85 switch (ch) {
86 case 'e':
87 random_exit = 1;
88 break;
89 case 'f':
90 randomize_lines = 1;
91 if (strcmp(optarg, "-") != 0)
92 filename = optarg;
93 break;
94 case 'l':
95 randomize_lines = 1;
96 random_type = RANDOM_TYPE_LINES;
97 break;
98 case 'r':
99 unbuffer_output = 1;
100 break;
101 case 'u':
102 randomize_lines = 1;
103 unique_output = 1;
104 break;
105 case 'U':
106 randomize_lines = 1;
107 unique_output = 0;
108 break;
109 case 'w':
110 randomize_lines = 1;
111 random_type = RANDOM_TYPE_WORDS;
112 break;
113 default:
114 case '?':
115 usage();
116 /* NOTREACHED */
117 }
118
119 argc -= optind;
120 argv += optind;
121
122 switch (argc) {
123 case 0:
124 denom = (randomize_lines ? 1. : 2.);
125 break;
126 case 1:
127 errno = 0;
128 denom = strtod(*argv, &ep);
129 if (errno == ERANGE)
130 err(1, "%s", *argv);
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.");
135 break;
136 default:
137 usage();
138 /* NOTREACHED */
139 }
140
141 /*
142 * Act as a filter, randomly choosing lines of the standard input
143 * to write to the standard output.
144 */
145 if (unbuffer_output)
146 setbuf(stdout, NULL);
147
148 /*
149 * Act as a filter, randomizing lines read in from a given file
150 * descriptor and write the output to standard output.
151 */
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);
156 if (!random_exit)
157 return(ret);
158 }
159
160 /* Compute a random exit status between 0 and denom - 1. */
161 if (random_exit)
162 return (arc4random_uniform(denom));
163
164 /*
165 * Filter stdin, selecting lines with probability 1/denom, one
166 * character at a time.
167 */
168 do {
169 selected = random_uniform_denom(denom);
170 if (selected) {
171 while ((ch = getchar()) != EOF) {
172 putchar(ch);
173 if (ch == '\n')
174 break;
175 }
176 } else {
177 while ((ch = getchar()) != EOF)
178 if (ch == '\n')
179 break;
180 }
181 if (ferror(stdout))
182 err(2, "stdout");
183 } while (ch != EOF);
184 if (ferror(stdin))
185 err(2, "stdin");
186 exit (0);
187 }
188
189 static void
usage(void)190 usage(void)
191 {
192
193 fprintf(stderr, "usage: random [-elrUuw] [-f filename] [denominator]\n");
194 exit(1);
195 }
196