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Replace <sys/param.h> with <limits.h> and other less dirty headers where
possible.  Annotate <sys/param.h> lines with their current reasons.  Switch
to PATH_MAX, NGROUPS_MAX, HOST_NAME_MAX+1, LOGIN_NAME_MAX, etc.  Change
MIN() and MAX() to local definitions of MINIMUM() and MAXIMUM() where
sensible to avoid pulling in the pollution.  These are the files confirmed
through binary verification.
ok guenther, millert, doug (helped with the verification protocol)

/*	$OpenBSD: preen.c,v 1.20 2015/01/16 06:39:57 deraadt Exp $	*/
/*	$NetBSD: preen.c,v 1.15 1996/09/28 19:21:42 christos Exp $	*/

/*
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 */

#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/queue.h>

#include <fstab.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <unistd.h>
#include <err.h>

#include "fsutil.h"

struct partentry {
	TAILQ_ENTRY(partentry)	 p_entries;
	char		  	*p_devname;	/* device name */
	char			*p_mntpt;	/* mount point */
	char		  	*p_type;	/* filesystem type */
	void			*p_auxarg;	/* auxiliary argument */
};

TAILQ_HEAD(part, partentry) badh;

struct diskentry {
	TAILQ_ENTRY(diskentry) 	    d_entries;
	char		       	   *d_name;	/* disk base name */
	TAILQ_HEAD(prt, partentry)  d_part;	/* list of partitions on disk */
	pid_t			    d_pid;	/* 0 or pid of fsck proc */
};

TAILQ_HEAD(disk, diskentry) diskh;

static int nrun = 0, ndisks = 0;

static struct diskentry *finddisk(const char *);
static void addpart(const char *, const char *, const char *, void *);
static int startdisk(struct diskentry *,
    int (*)(const char *, const char *, const char *, void *, pid_t *));
static void printpart(void);

int
checkfstab(int flags, int maxrun, void *(*docheck)(struct fstab *),
    int (*checkit)(const char *, const char *, const char *, void *, pid_t *))
{
	struct fstab *fs;
	struct diskentry *d, *nextdisk;
	struct partentry *p;
	int ret, retcode, passno, sumstatus, status, maxp;
	void *auxarg;
	char *name;
	pid_t pid;

	TAILQ_INIT(&badh);
	TAILQ_INIT(&diskh);

	sumstatus = 0;
	maxp = 2;

	for (passno = 1; passno <= maxp; passno++) {
		if (setfsent() == 0) {
			warnx("Can't open checklist file: %s", _PATH_FSTAB);
			return (8);
		}
		while ((fs = getfsent()) != 0) {
			if ((auxarg = (*docheck)(fs)) == NULL)
				continue;

			name = blockcheck(fs->fs_spec);
			if (flags & CHECK_DEBUG)
				printf("pass %d, name %s\n", passno, name);
			maxp = (fs->fs_passno > maxp) ? fs->fs_passno : maxp;

			if ((flags & CHECK_PREEN) == 0 ||
			    (passno == 1 && fs->fs_passno == 1)) {
				if (name == NULL) {
					if (flags & CHECK_PREEN)
						return 8;
					else
						continue;
				}
				sumstatus = (*checkit)(fs->fs_vfstype,
				    name, fs->fs_file, auxarg, NULL);

				if (sumstatus)
					return (sumstatus);
			} else  {
				if (name == NULL) {
					(void) fprintf(stderr,
					    "BAD DISK NAME %s\n", fs->fs_spec);
					sumstatus |= 8;
					continue;
				}
				if (passno == fs->fs_passno)
					addpart(fs->fs_vfstype, name,
					    fs->fs_file, auxarg);
			}
		}
		if ((flags & CHECK_PREEN) == 0)
			return 0;
	}

	if (flags & CHECK_DEBUG)
		printpart();

	if (flags & CHECK_PREEN) {
		if (maxrun == 0)
			maxrun = ndisks;
		if (maxrun > ndisks)
			maxrun = ndisks;
		nextdisk = TAILQ_FIRST(&diskh);
		for (passno = 0; passno < maxrun; ++passno) {
			if ((ret = startdisk(nextdisk, checkit)) != 0)
				return ret;
			nextdisk = TAILQ_NEXT(nextdisk, d_entries);
		}

		while ((pid = wait(&status)) != -1) {
			TAILQ_FOREACH(d, &diskh, d_entries)
				if (d->d_pid == pid)
					break;

			if (d == NULL) {
				warnx("Unknown pid %ld", (long)pid);
				continue;
			}


			if (WIFEXITED(status))
				retcode = WEXITSTATUS(status);
			else
				retcode = 0;

			p = TAILQ_FIRST(&d->d_part);

			if (flags & (CHECK_DEBUG|CHECK_VERBOSE))
				(void) printf("done %s: %s (%s) = %x\n",
				    p->p_type, p->p_devname, p->p_mntpt,
				    status);

			if (WIFSIGNALED(status)) {
				(void) fprintf(stderr,
				    "%s: %s (%s): EXITED WITH SIGNAL %d\n",
				    p->p_type, p->p_devname, p->p_mntpt,
				    WTERMSIG(status));
				retcode = 8;
			}

			TAILQ_REMOVE(&d->d_part, p, p_entries);

			if (retcode != 0) {
				TAILQ_INSERT_TAIL(&badh, p, p_entries);
				sumstatus |= retcode;
			} else {
				free(p->p_type);
				free(p->p_devname);
				free(p);
			}
			d->d_pid = 0;
			nrun--;

			if (TAILQ_EMPTY(&d->d_part))
				ndisks--;

			if (nextdisk == NULL) {
				if (!TAILQ_EMPTY(&d->d_part)) {
					if ((ret = startdisk(d, checkit)) != 0)
						return ret;
				}
			} else if (nrun < maxrun && nrun < ndisks) {
				for ( ;; ) {
					nextdisk = TAILQ_NEXT(nextdisk,
					    d_entries);
					if (nextdisk == NULL)
						nextdisk = TAILQ_FIRST(&diskh);
					if (!TAILQ_EMPTY(&nextdisk->d_part) &&
					    nextdisk->d_pid == 0)
						break;
				}
				if ((ret = startdisk(nextdisk, checkit)) != 0)
					return ret;
			}
		}
	}
	if (sumstatus) {
		p = TAILQ_FIRST(&badh);
		if (p == NULL)
			return (sumstatus);

		(void) fprintf(stderr,
			"THE FOLLOWING FILE SYSTEM%s HAD AN %s\n\t",
			TAILQ_NEXT(p, p_entries) ? "S" : "",
			"UNEXPECTED INCONSISTENCY:");

		for (; p; p = TAILQ_NEXT(p, p_entries))
			(void) fprintf(stderr,
			    "%s: %s (%s)%s", p->p_type, p->p_devname,
			    p->p_mntpt, TAILQ_NEXT(p, p_entries) ? ", " : "\n");

		return sumstatus;
	}
	(void) endfsent();
	return (0);
}


static struct diskentry *
finddisk(const char *name)
{
	const char *p;
	size_t len = 0;
	struct diskentry *d;

	for (p = name + strlen(name) - 1; p >= name; --p)
		if (isdigit((unsigned char)*p)) {
			len = p - name + 1;
			break;
		}

	if (p < name)
		len = strlen(name);

	TAILQ_FOREACH(d, &diskh, d_entries)
		if (strncmp(d->d_name, name, len) == 0 && d->d_name[len] == 0)
			return d;

	d = emalloc(sizeof(*d));
	d->d_name = estrdup(name);
	d->d_name[len] = '\0';
	TAILQ_INIT(&d->d_part);
	d->d_pid = 0;

	TAILQ_INSERT_TAIL(&diskh, d, d_entries);
	ndisks++;

	return d;
}


static void
printpart(void)
{
	struct diskentry *d;
	struct partentry *p;

	TAILQ_FOREACH(d, &diskh, d_entries) {
		(void) printf("disk %s: ", d->d_name);
		TAILQ_FOREACH(p, &d->d_part, p_entries)
			(void) printf("%s ", p->p_devname);
		(void) printf("\n");
	}
}


static void
addpart(const char *type, const char *devname, const char *mntpt, void *auxarg)
{
	struct diskentry *d = finddisk(devname);
	struct partentry *p;

	TAILQ_FOREACH(p, &d->d_part, p_entries)
		if (strcmp(p->p_devname, devname) == 0) {
			warnx("%s in fstab more than once!", devname);
			return;
		}

	p = emalloc(sizeof(*p));
	p->p_devname = estrdup(devname);
	p->p_mntpt = estrdup(mntpt);
	p->p_type = estrdup(type);
	p->p_auxarg = auxarg;

	TAILQ_INSERT_TAIL(&d->d_part, p, p_entries);
}


static int
startdisk(struct diskentry *d,
    int (*checkit)(const char *, const char *, const char *, void *, pid_t *))
{
	struct partentry *p = TAILQ_FIRST(&d->d_part);
	int rv;

	while ((rv = (*checkit)(p->p_type, p->p_devname, p->p_mntpt,
	    p->p_auxarg, &d->d_pid)) != 0 && nrun > 0)
		sleep(10);

	if (rv == 0)
		nrun++;

	return rv;
}