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Part one of userland __P removal.  Done with a simple regexp with some minor hand editing to make comments line up correctly.  Another pass is forthcoming that handles the cases that could not be done automatically.

/*	$OpenBSD: iostat.c,v 1.17 2002/02/16 21:27:54 millert Exp $	*/
/*	$NetBSD: iostat.c,v 1.5 1996/05/10 23:16:35 thorpej Exp $	*/

/*
 * Copyright (c) 1980, 1992, 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)iostat.c	8.1 (Berkeley) 6/6/93";
#endif
static char rcsid[] = "$OpenBSD: iostat.c,v 1.17 2002/02/16 21:27:54 millert Exp $";
#endif /* not lint */

#include <sys/param.h>
#include <sys/dkstat.h>
#include <sys/buf.h>
#include <sys/time.h>

#include <string.h>
#include <stdlib.h>
#include <paths.h>
#include "systat.h"
#include "extern.h"

#include "dkstats.h"
extern struct _disk	cur;

static  int linesperregion;
static  double etime;
static  int numbers = 0;		/* default display bar graphs */
static  int secs = 0;			/* default seconds shown */

static int barlabels(int);
static void histogram(double, int, double);
static int numlabels(int);
static int stats(int, int, int);
static void stat1(int, int);


WINDOW *
openiostat()
{
	return (subwin(stdscr, LINES-1-5, 0, 5, 0));
}

void
closeiostat(w)
	WINDOW *w;
{
	if (w == NULL)
		return;
	wclear(w);
	wrefresh(w);
	delwin(w);
}

int
initiostat()
{
	dkinit(1);
	dkreadstats();
	return (1);
}

void
fetchiostat()
{
	if (dk_ndrive == 0)
		return;
	dkreadstats();
}

#define	INSET	10

void
labeliostat()
{
	int row;

	row = 0;
	wmove(wnd, row, 0); wclrtobot(wnd);
	mvwaddstr(wnd, row++, INSET,
	    "/0   /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
	mvwaddstr(wnd, row++, 0, "cpu  user|");
	mvwaddstr(wnd, row++, 0, "     nice|");
	mvwaddstr(wnd, row++, 0, "   system|");
	mvwaddstr(wnd, row++, 0, "interrupt|");
	mvwaddstr(wnd, row++, 0, "     idle|");
	if (numbers)
		row = numlabels(row + 1);
	else
		row = barlabels(row + 1);
}

static int
numlabels(row)
	int row;
{
	int i, col, regions, ndrives;

	if (dk_ndrive == 0) {
		mvwaddstr(wnd, row++, INSET, "No drives attached.");
		return (row);
	}
#define COLWIDTH	17
#define DRIVESPERLINE	((wnd->_maxx - INSET) / COLWIDTH)
	for (ndrives = 0, i = 0; i < dk_ndrive; i++)
		if (cur.dk_select[i])
			ndrives++;
	regions = howmany(ndrives, DRIVESPERLINE);
	/*
	 * Deduct -regions for blank line after each scrolling region.
	 */
	linesperregion = (wnd->_maxy - row - regions) / regions;
	/*
	 * Minimum region contains space for two
	 * label lines and one line of statistics.
	 */
	if (linesperregion < 3)
		linesperregion = 3;
	col = INSET;
	for (i = 0; i < dk_ndrive; i++)
		if (cur.dk_select[i] /*&& cur.dk_bytes[i] != 0.0*/) {
			if (col + COLWIDTH >= wnd->_maxx) {
				col = INSET, row += linesperregion + 1;
				if (row > wnd->_maxy - (linesperregion + 1))
					break;
			}
			mvwaddstr(wnd, row, col + 4, cur.dk_name[i]);
			mvwaddstr(wnd, row + 1, col, " KBps tps  sec");
			col += COLWIDTH;
		}
	if (col)
		row += linesperregion + 1;
	return (row);
}

static int
barlabels(row)
	int row;
{
	int i;

	if (dk_ndrive == 0) {
		mvwaddstr(wnd, row++, INSET, "No drives attached.");
		return (row);
	}
	mvwaddstr(wnd, row++, INSET,
	    "/0   /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
	linesperregion = 2 + secs;
	for (i = 0; i < dk_ndrive; i++)
		if (cur.dk_select[i] /*&& cur.dk_bytes[i] != 0.0*/) {
			if (row > wnd->_maxy - linesperregion)
				break;
			mvwprintw(wnd, row++, 0, "%4.4s  Kps|", cur.dk_name[i]);
			mvwaddstr(wnd, row++, 0, "      tps|");
			if (secs)
				mvwaddstr(wnd, row++, 0, "     msec|");
		}
	return (row);
}


void
showiostat()
{
	int i, row, col;

	dkswap();

	etime = 0;
	for(i = 0; i < CPUSTATES; i++) {
		etime += cur.cp_time[i];
	}
	if (etime == 0.0)
		etime = 1.0;
	etime /= (float) hz;
	row = 1;

	/*
	 * Interrupt CPU state not calculated yet.
	 */
	for (i = 0; i < CPUSTATES; i++)
		stat1(row++, i);

	if (dk_ndrive == 0)
		return;

	if (!numbers) {
		row += 2;
		for (i = 0; i < dk_ndrive; i++)
			if (cur.dk_select[i] /*&& cur.dk_bytes[i] != 0.0*/) {
				if (row > wnd->_maxy - linesperregion)
					break;
				row = stats(row, INSET, i);
			}
		return;
	}
	col = INSET;
	wmove(wnd, row + linesperregion, 0);
	wdeleteln(wnd);
	wmove(wnd, row + 3, 0);
	winsertln(wnd);
	for (i = 0; i < dk_ndrive; i++)
		if (cur.dk_select[i] /*&& cur.dk_bytes[i] != 0.0*/) {
			if (col + COLWIDTH >= wnd->_maxx) {
				col = INSET, row += linesperregion + 1;
				if (row > wnd->_maxy - (linesperregion + 1))
					break;
				wmove(wnd, row + linesperregion, 0);
				wdeleteln(wnd);
				wmove(wnd, row + 3, 0);
				winsertln(wnd);
			}
			(void) stats(row + 3, col, i);
			col += COLWIDTH;
		}
}

static int
stats(row, col, dn)
	int row, col, dn;
{
	double atime, words;

	/* time busy in disk activity */
	atime = (double)cur.dk_time[dn].tv_sec +
		((double)cur.dk_time[dn].tv_usec / (double)1000000);

	words = cur.dk_bytes[dn] / 1024.0;	/* # of K transferred */
	if (numbers) {
		mvwprintw(wnd, row, col, "%5.0f%4.0f%5.1f",
		    words / etime, cur.dk_xfer[dn] / etime, atime / etime);
		return (row);
	}
	wmove(wnd, row++, col);
	histogram(words / etime, 50, 0.5);
	wmove(wnd, row++, col);
	histogram(cur.dk_xfer[dn] / etime, 50, 0.5);
	if (secs) {
		wmove(wnd, row++, col);
		atime *= 1000;	/* In milliseconds */
		histogram(atime / etime, 50, 0.5);
	}
	return (row);
}

static void
stat1(row, o)
	int row, o;
{
	int i;
	double time;

	time = 0;
	for (i = 0; i < CPUSTATES; i++)
		time += cur.cp_time[i];
	if (time == 0.0)
		time = 1.0;
	wmove(wnd, row, INSET);
#define CPUSCALE	0.5
	histogram(100.0 * cur.cp_time[o] / time, 50, CPUSCALE);
}

static void
histogram(val, colwidth, scale)
	double val;
	int colwidth;
	double scale;
{
	char buf[10];
	int k;
	int v = (int)(val * scale) + 0.5;

	k = MIN(v, colwidth);
	if (v > colwidth) {
		snprintf(buf, sizeof buf, "%4.1f", val);
		k -= strlen(buf);
		while (k--)
			waddch(wnd, 'X');
		waddstr(wnd, buf);
		wclrtoeol(wnd);
		return;
	}
	while (k--)
		waddch(wnd, 'X');
	wclrtoeol(wnd);
}

int
cmdiostat(cmd, args)
	char *cmd, *args;
{

	if (prefix(cmd, "secs"))
		secs = !secs;
	else if (prefix(cmd, "numbers"))
		numbers = 1;
	else if (prefix(cmd, "bars"))
		numbers = 0;
	else if (!dkcmd(cmd, args))
		return (0);
	wclear(wnd);
	labeliostat();
	refresh();
	return (1);
}