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 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 190 usage(void) 191 { 192 193 fprintf(stderr, "usage: random [-elrUuw] [-f filename] [denominator]\n"); 194 exit(1); 195 } 196