003 File Manager
Current Path:
/usr/src/usr.bin/random
usr
/
src
/
usr.bin
/
random
/
📁
..
📄
Makefile
(132 B)
📄
Makefile.depend
(273 B)
📄
random.6
(3.9 KB)
📄
random.c
(4.83 KB)
📄
randomize_fd.c
(5.42 KB)
📄
randomize_fd.h
(2.59 KB)
Editing: random.c
/* * Copyright (c) 1994 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Guy Harris at Network Appliance Corp. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if 0 #ifndef lint static const char copyright[] = "@(#) Copyright (c) 1994\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint static const char sccsid[] = "@(#)random.c 8.5 (Berkeley) 4/5/94"; #endif /* not lint */ #endif #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/types.h> #include <err.h> #include <errno.h> #include <fcntl.h> #include <limits.h> #include <locale.h> #include <stdbool.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <time.h> #include <unistd.h> #include "randomize_fd.h" static void usage(void); int main(int argc, char *argv[]) { double denom; int ch, fd, random_exit, randomize_lines, random_type, ret, unique_output, unbuffer_output; bool selected; char *ep; const char *filename; denom = 0.; filename = "/dev/fd/0"; random_type = RANDOM_TYPE_UNSET; random_exit = randomize_lines = unbuffer_output = 0; unique_output = 1; (void)setlocale(LC_CTYPE, ""); while ((ch = getopt(argc, argv, "ef:hlruUw")) != -1) switch (ch) { case 'e': random_exit = 1; break; case 'f': randomize_lines = 1; if (strcmp(optarg, "-") != 0) filename = optarg; break; case 'l': randomize_lines = 1; random_type = RANDOM_TYPE_LINES; break; case 'r': unbuffer_output = 1; break; case 'u': randomize_lines = 1; unique_output = 1; break; case 'U': randomize_lines = 1; unique_output = 0; break; case 'w': randomize_lines = 1; random_type = RANDOM_TYPE_WORDS; break; default: case '?': usage(); /* NOTREACHED */ } argc -= optind; argv += optind; switch (argc) { case 0: denom = (randomize_lines ? 1. : 2.); break; case 1: errno = 0; denom = strtod(*argv, &ep); if (errno == ERANGE) err(1, "%s", *argv); if (denom < 1. || *ep != '\0') errx(1, "denominator is not valid."); if (random_exit && denom > 256.) errx(1, "denominator must be <= 256 for random exit."); break; default: usage(); /* NOTREACHED */ } /* * Act as a filter, randomly choosing lines of the standard input * to write to the standard output. */ if (unbuffer_output) setbuf(stdout, NULL); /* * Act as a filter, randomizing lines read in from a given file * descriptor and write the output to standard output. */ if (randomize_lines) { if ((fd = open(filename, O_RDONLY, 0)) < 0) err(1, "%s", filename); ret = randomize_fd(fd, random_type, unique_output, denom); if (!random_exit) return(ret); } /* Compute a random exit status between 0 and denom - 1. */ if (random_exit) return (arc4random_uniform(denom)); /* * Filter stdin, selecting lines with probability 1/denom, one * character at a time. */ do { selected = random_uniform_denom(denom); if (selected) { while ((ch = getchar()) != EOF) { putchar(ch); if (ch == '\n') break; } } else { while ((ch = getchar()) != EOF) if (ch == '\n') break; } if (ferror(stdout)) err(2, "stdout"); } while (ch != EOF); if (ferror(stdin)) err(2, "stdin"); exit (0); } static void usage(void) { fprintf(stderr, "usage: random [-elrUuw] [-f filename] [denominator]\n"); exit(1); }
Upload File
Create Folder