This program is trash and there's no reason to keep it in base. But as long as we're shipping a silly program named 'random', let's actually make it random.
249 lines
5.4 KiB
C
249 lines
5.4 KiB
C
/*
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* Copyright (C) 2003 Sean Chittenden <seanc@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "randomize_fd.h"
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static struct rand_node *rand_root;
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static struct rand_node *rand_tail;
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static struct rand_node *
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rand_node_allocate(void)
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{
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struct rand_node *n;
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n = (struct rand_node *)malloc(sizeof(struct rand_node));
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if (n == NULL)
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err(1, "malloc");
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n->len = 0;
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n->cp = NULL;
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n->next = NULL;
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return(n);
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}
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static void
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rand_node_free(struct rand_node *n)
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{
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if (n != NULL) {
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if (n->cp != NULL)
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free(n->cp);
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free(n);
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}
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}
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static void
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rand_node_free_rec(struct rand_node *n)
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{
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if (n != NULL) {
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if (n->next != NULL)
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rand_node_free_rec(n->next);
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rand_node_free(n);
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}
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}
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static void
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rand_node_append(struct rand_node *n)
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{
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if (rand_root == NULL)
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rand_root = rand_tail = n;
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else {
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rand_tail->next = n;
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rand_tail = n;
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}
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}
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int
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randomize_fd(int fd, int type, int unique, double denom)
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{
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u_char *buf;
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u_int slen;
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u_long i, j, numnode, selected;
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struct rand_node *n, *prev;
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int bufleft, eof, fndstr, ret;
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size_t bufc, buflen;
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ssize_t len;
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rand_root = rand_tail = NULL;
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bufc = i = 0;
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bufleft = eof = fndstr = numnode = 0;
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if (type == RANDOM_TYPE_UNSET)
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type = RANDOM_TYPE_LINES;
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buflen = sizeof(u_char) * MAXBSIZE;
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buf = (u_char *)malloc(buflen);
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if (buf == NULL)
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err(1, "malloc");
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while (!eof) {
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/* Check to see if we have bits in the buffer */
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if (bufleft == 0) {
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len = read(fd, buf, buflen);
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if (len == -1)
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err(1, "read");
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else if (len == 0) {
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eof++;
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break;
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} else if ((size_t)len < buflen)
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buflen = (size_t)len;
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bufleft = (int)len;
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}
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/* Look for a newline */
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for (i = bufc; i <= buflen && bufleft >= 0; i++, bufleft--) {
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if (i == buflen) {
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if (fndstr) {
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if (!eof) {
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memmove(buf, &buf[bufc], i - bufc);
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i -= bufc;
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bufc = 0;
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len = read(fd, &buf[i], buflen - i);
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if (len == -1)
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err(1, "read");
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else if (len == 0) {
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eof++;
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break;
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} else if (len < (ssize_t)(buflen - i))
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buflen = i + (size_t)len;
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bufleft = (int)len;
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fndstr = 0;
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}
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} else {
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buflen *= 2;
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buf = (u_char *)realloc(buf, buflen);
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if (buf == NULL)
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err(1, "realloc");
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if (!eof) {
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len = read(fd, &buf[i], buflen - i);
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if (len == -1)
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err(1, "read");
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else if (len == 0) {
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eof++;
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break;
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} else if (len < (ssize_t)(buflen - i))
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buflen = i + (size_t)len;
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bufleft = (int)len;
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}
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}
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}
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if ((type == RANDOM_TYPE_LINES && buf[i] == '\n') ||
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(type == RANDOM_TYPE_WORDS && isspace(buf[i])) ||
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(eof && i == buflen - 1)) {
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make_token:
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if (numnode == UINT32_MAX - 1) {
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errno = EFBIG;
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err(1, "too many delimiters");
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}
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numnode++;
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n = rand_node_allocate();
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if (-1 != (int)i) {
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slen = i - (u_long)bufc;
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n->len = slen + 2;
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n->cp = (u_char *)malloc(slen + 2);
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if (n->cp == NULL)
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err(1, "malloc");
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memmove(n->cp, &buf[bufc], slen);
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n->cp[slen] = buf[i];
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n->cp[slen + 1] = '\0';
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bufc = i + 1;
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}
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rand_node_append(n);
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fndstr = 1;
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}
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}
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}
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/* Necessary evil to compensate for files that don't end with a newline */
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if (bufc != i) {
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i--;
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goto make_token;
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}
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(void)close(fd);
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free(buf);
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for (i = numnode; i > 0; i--) {
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selected = arc4random_uniform(numnode + 1);
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for (j = 0, prev = n = rand_root; n != NULL; j++, prev = n, n = n->next) {
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if (j == selected) {
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if (n->cp == NULL)
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break;
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if (arc4random_uniform(denom) == 0) {
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ret = printf("%.*s",
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(int)n->len - 1, n->cp);
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if (ret < 0)
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err(1, "printf");
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}
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if (unique) {
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if (n == rand_root)
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rand_root = n->next;
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if (n == rand_tail)
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rand_tail = prev;
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prev->next = n->next;
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rand_node_free(n);
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numnode--;
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}
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break;
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}
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}
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}
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fflush(stdout);
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if (!unique)
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rand_node_free_rec(rand_root);
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return(0);
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}
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