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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: w.c,v 1.57 2015/01/16 06:40:14 deraadt Exp $	*/

/*-
 * Copyright (c) 1980, 1991, 1993, 1994
 *	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.
 */

/*
 * w - print system status (who and what)
 *
 * This program is similar to the systat command on Tenex/Tops 10/20
 *
 */
#include <sys/param.h>	/* MAXCOMLEN */
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/signal.h>
#include <sys/proc.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/tty.h>

#include <netinet/in.h>
#include <arpa/inet.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <kvm.h>
#include <netdb.h>
#include <nlist.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <tzfile.h>
#include <unistd.h>
#include <limits.h>
#include <utmp.h>
#include <vis.h>

#include "extern.h"

struct timeval	boottime;
struct utmp	utmp;
struct winsize	ws;
kvm_t	       *kd;
time_t		now;		/* the current time of day */
int		ttywidth;	/* width of tty */
int		argwidth;	/* width of tty */
int		header = 1;	/* true if -h flag: don't print heading */
int		nflag = 1;	/* true if -n flag: don't convert addrs */
int		sortidle;	/* sort by idle time */
char	       *sel_user;	/* login of particular user selected */
char		domain[HOST_NAME_MAX+1];

#define	NAME_WIDTH	8
#define HOST_WIDTH	16

/*
 * One of these per active utmp entry.
 */
struct	entry {
	struct	entry *next;
	struct	utmp utmp;
	dev_t	tdev;			/* dev_t of terminal */
	time_t	idle;			/* idle time of terminal in seconds */
	struct	kinfo_proc *kp;		/* `most interesting' proc */
} *ep, *ehead = NULL, **nextp = &ehead;

static void	 pr_args(struct kinfo_proc *);
static void	 pr_header(time_t *, int);
static struct stat
		*ttystat(char *);
static void	 usage(int);

int
main(int argc, char *argv[])
{
	extern char *__progname;
	struct kinfo_proc *kp;
	struct hostent *hp;
	struct stat *stp;
	FILE *ut;
	struct in_addr addr;
	int ch, i, nentries, nusers, wcmd;
	char *memf, *nlistf, *p, *x;
	char buf[HOST_NAME_MAX+1], errbuf[_POSIX2_LINE_MAX];

	/* Are we w(1) or uptime(1)? */
	p = __progname;
	if (*p == '-')
		p++;
	if (p[0] == 'w' && p[1] == '\0') {
		wcmd = 1;
		p = "hiflM:N:asuw";
	} else if (!strcmp(p, "uptime")) {
		wcmd = 0;
		p = "";
	} else
		errx(1,
		 "this program should be invoked only as \"w\" or \"uptime\"");

	memf = nlistf = NULL;
	while ((ch = getopt(argc, argv, p)) != -1)
		switch (ch) {
		case 'h':
			header = 0;
			break;
		case 'i':
			sortidle = 1;
			break;
		case 'M':
			header = 0;
			memf = optarg;
			break;
		case 'N':
			nlistf = optarg;
			break;
		case 'a':
			nflag = 0;
			break;
		case 'f': case 'l': case 's': case 'u': case 'w':
			warnx("[-flsuw] no longer supported");
			/* FALLTHROUGH */
		case '?':
		default:
			usage(wcmd);
		}
	argc -= optind;
	argv += optind;

	if (nlistf == NULL && memf == NULL) {
		if ((kd = kvm_openfiles(nlistf, memf, NULL, KVM_NO_FILES,
		    errbuf)) == NULL)
			errx(1, "%s", errbuf);
	} else {
		if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
			errx(1, "%s", errbuf);
	}

	(void)time(&now);
	if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
		err(1, "%s", _PATH_UTMP);

	if (*argv)
		sel_user = *argv;

	for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
		if (utmp.ut_name[0] == '\0')
			continue;
		++nusers;
		if (wcmd == 0 || (sel_user &&
		    strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
			continue;
		if ((ep = calloc(1, sizeof(*ep))) == NULL)
			err(1, NULL);
		*nextp = ep;
		nextp = &(ep->next);
		memcpy(&(ep->utmp), &utmp, sizeof(utmp));
		if (!(stp = ttystat(ep->utmp.ut_line)))
			continue;
		ep->tdev = stp->st_rdev;

		/*
		 * If this is the console device, attempt to ascertain
		 * the true console device dev_t.
		 */
		if (ep->tdev == 0) {
			int mib[2];
			size_t size;

			mib[0] = CTL_KERN;
			mib[1] = KERN_CONSDEV;
			size = sizeof(dev_t);
			(void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
		}

		if ((ep->idle = now - stp->st_atime) < 0)
			ep->idle = 0;
	}
	(void)fclose(ut);

	if (header || wcmd == 0) {
		pr_header(&now, nusers);
		if (wcmd == 0)
			exit (0);
	}

#define HEADER	"USER    TTY FROM              LOGIN@  IDLE WHAT"
#define WUSED	(sizeof(HEADER) - sizeof("WHAT"))
	(void)puts(HEADER);

	kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, sizeof(*kp), &nentries);
	if (kp == NULL)
		errx(1, "%s", kvm_geterr(kd));
	for (i = 0; i < nentries; i++, kp++) {
		if (kp->p_psflags & (PS_EMBRYO | PS_ZOMBIE))
			continue;
		for (ep = ehead; ep != NULL; ep = ep->next) {
			/* ftp is a special case. */
			if (strncmp(ep->utmp.ut_line, "ftp", 3) == 0) {
				char pidstr[UT_LINESIZE-2];
				pid_t fp;

				(void)strncpy(pidstr, &ep->utmp.ut_line[3],
				    sizeof(pidstr) - 1);
				pidstr[sizeof(pidstr) - 1] = '\0';
				fp = (pid_t)strtol(pidstr, NULL, 10);
				if (kp->p_pid == fp) {
					ep->kp = kp;
					break;
				}
			} else if (ep->tdev == kp->p_tdev &&
			    kp->p__pgid == kp->p_tpgid) {
				/*
				 * Proc is in foreground of this terminal
				 */
				if (proc_compare(ep->kp, kp))
					ep->kp = kp;
				break;
			}
		}
	}
	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
	    ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
	    ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
		ttywidth = 79;
	else
		ttywidth = ws.ws_col - 1;
	argwidth = ttywidth - WUSED;
	if (argwidth < 4)
		argwidth = 8;
	/* sort by idle time */
	if (sortidle && ehead != NULL) {
		struct entry *from = ehead, *save;

		ehead = NULL;
		while (from != NULL) {
			for (nextp = &ehead;
			    (*nextp) && from->idle >= (*nextp)->idle;
			    nextp = &(*nextp)->next)
				continue;
			save = from;
			from = from->next;
			save->next = *nextp;
			*nextp = save;
		}
	}

	if (!nflag) {
		if (gethostname(domain, sizeof(domain)) < 0 ||
		    (p = strchr(domain, '.')) == 0)
			domain[0] = '\0';
		else {
			domain[sizeof(domain) - 1] = '\0';
			memmove(domain, p, strlen(p) + 1);
		}
	}

	for (ep = ehead; ep != NULL; ep = ep->next) {
		p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
		for (x = NULL, i = 0; p[i] != '\0' && i < UT_HOSTSIZE; i++)
			if (p[i] == ':') {
				x = &p[i];
				*x++ = '\0';
				break;
			}
		if (!nflag && inet_aton(p, &addr) &&
		    (hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET))) {
			if (domain[0] != '\0') {
				p = hp->h_name;
				p += strlen(hp->h_name);
				p -= strlen(domain);
				if (p > hp->h_name &&
				    strcasecmp(p, domain) == 0)
					*p = '\0';
			}
			p = hp->h_name;
		}
		if (x) {
			(void)snprintf(buf, sizeof(buf), "%s:%.*s", p,
			    (int)(ep->utmp.ut_host + UT_HOSTSIZE - x), x);
			p = buf;
		}
		(void)printf("%-*.*s %-2.2s %-*.*s ",
		    NAME_WIDTH, UT_NAMESIZE, ep->utmp.ut_name,
		    strncmp(ep->utmp.ut_line, "tty", 3) ?
		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
		    HOST_WIDTH, HOST_WIDTH, *p ? p : "-");
		pr_attime(&ep->utmp.ut_time, &now);
		pr_idle(ep->idle);
		pr_args(ep->kp);
		printf("\n");
	}
	exit(0);
}

static void
pr_args(struct kinfo_proc *kp)
{
	char **argv, *str;
	int left;

	if (kp == NULL)
		goto nothing;		/* XXX - can this happen? */
	left = argwidth;
	argv = kvm_getargv(kd, kp, argwidth+60);  /* +60 for ftpd snip */
	if (argv == NULL)
		goto nothing;

	if (*argv == NULL || **argv == '\0') {
		/* Process has zeroed argv[0], display executable name. */
		fmt_putc('(', &left);
		fmt_puts(kp->p_comm, &left);
		fmt_putc(')', &left);
	}
	while (*argv) {
		/*
		 * ftp argv[0] is in the following format:
		 * ftpd: HOSTNAME: [USER/PASS: ]CMD args (ftpd)
		 */
		if (strncmp(*argv, "ftpd:", 5) == 0) {
			if ((str = strchr(*argv + 5, ':')) != NULL)
				str = strchr(str + 1, ':');
			if (str != NULL) {
				if ((str[0] == ':') &&
				    isspace((unsigned char)str[1]))
					str += 2;
				fmt_puts(str, &left);
			} else
				fmt_puts(*argv, &left);
		} else
			fmt_puts(*argv, &left);
		argv++;
		fmt_putc(' ', &left);
	}
	return;
nothing:
	putchar('-');
}

static void
pr_header(time_t *nowp, int nusers)
{
	double avenrun[3];
	time_t uptime;
	int days, hrs, i, mins;
	int mib[2];
	size_t size;
	char buf[256];

	/*
	 * Print time of day.
	 */
	(void)strftime(buf, sizeof(buf) - 1, "%l:%M%p", localtime(nowp));
	buf[sizeof(buf) - 1] = '\0';
	(void)printf("%s ", buf);

	/*
	 * Print how long system has been up.
	 * (Found by getting "boottime" from the kernel)
	 */
	mib[0] = CTL_KERN;
	mib[1] = KERN_BOOTTIME;
	size = sizeof(boottime);
	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1) {
		uptime = now - boottime.tv_sec;
		if (uptime > 59) {
			uptime += 30;
			days = uptime / SECSPERDAY;
			uptime %= SECSPERDAY;
			hrs = uptime / SECSPERHOUR;
			uptime %= SECSPERHOUR;
			mins = uptime / SECSPERMIN;
			(void)printf(" up");
			if (days > 0)
				(void)printf(" %d day%s,", days,
				    days > 1 ? "s" : "");
			if (hrs > 0 && mins > 0)
				(void)printf(" %2d:%02d,", hrs, mins);
			else {
				if (hrs > 0)
					(void)printf(" %d hr%s,",
					    hrs, hrs > 1 ? "s" : "");
				if (mins > 0 || (days == 0 && hrs == 0))
					(void)printf(" %d min%s,",
					    mins, mins != 1 ? "s" : "");
			}
		} else
			printf(" %d secs,", (int)uptime);
	}

	/* Print number of users logged in to system */
	(void)printf(" %d user%s", nusers, nusers != 1 ? "s" : "");

	/*
	 * Print 1, 5, and 15 minute load averages.
	 */
	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
		(void)printf(", no load average information available\n");
	else {
		(void)printf(", load averages:");
		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
			if (i > 0)
				(void)printf(",");
			(void)printf(" %.2f", avenrun[i]);
		}
		(void)printf("\n");
	}
}

static struct stat *
ttystat(char *line)
{
	static struct stat sb;
	char ttybuf[sizeof(_PATH_DEV) + UT_LINESIZE];

	/* Note, line may not be NUL-terminated */
	(void)strlcpy(ttybuf, _PATH_DEV, sizeof(ttybuf));
	(void)strncat(ttybuf, line, sizeof(ttybuf) - 1 - strlen(ttybuf));
	if (stat(ttybuf, &sb))
		return (NULL);
	return (&sb);
}

static void
usage(int wcmd)
{
	if (wcmd)
		(void)fprintf(stderr,
		    "usage: w [-ahi] [-M core] [-N system] [user]\n");
	else
		(void)fprintf(stderr,
		    "usage: uptime\n");
	exit (1);
}