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6693db17 | 1 | /*- |
984263bc MD |
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 |
984263bc MD |
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. | |
1de703da MD |
31 | * |
32 | * @(#) Copyright (c) 1994 The Regents of the University of California. All rights reserved. | |
33 | * @(#)random.c 8.5 (Berkeley) 4/5/94 | |
ad051b28 CP |
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 $ | |
984263bc MD |
36 | */ |
37 | ||
984263bc MD |
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 | ||
52 | static void usage(void); | |
53 | ||
54 | int | |
55 | main(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; | |
b8a2ba94 CP |
60 | char *ep; |
61 | const char *filename; | |
984263bc MD |
62 | |
63 | denom = 0; | |
b8a2ba94 | 64 | filename = "/dev/fd/0"; |
984263bc MD |
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) |
984263bc MD |
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 | ||
174 | static void | |
175 | usage(void) | |
176 | { | |
177 | ||
ad051b28 | 178 | fprintf(stderr, "usage: random [-elrUuw] [-f filename] [denominator]\n"); |
984263bc MD |
179 | exit(1); |
180 | } |