194 lines
4.8 KiB
C
194 lines
4.8 KiB
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>
|
|
#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) __dead2;
|
|
|
|
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);
|
|
}
|