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New display engine for systat, based on pftop. Adds new views for pf
(status, state, rule, queue). While all displays work, some keyboard
comands are not implemented yet. Other features include better handling
of display resize and scrolling for long views. Committing now to fix
the remaining issues in the tree.
Testing and comments by otto@ and harding@, ok deraadt@

/*	$OpenBSD: swap.c,v 1.21 2008/06/12 22:26:01 canacar Exp $	*/
/*	$NetBSD: swap.c,v 1.9 1998/12/26 07:05:08 marc Exp $	*/

/*-
 * Copyright (c) 1997 Matthew R. Green.  All rights reserved.
 * 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. 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/cdefs.h>
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/swap.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>

#include "systat.h"


static	long blocksize;
static	int hlen, nswap, rnswap;
static	struct swapent *swap_devices;

void print_sw(void);
int read_sw(void);
int select_sw(void);
static void showswap(int i);
static void showtotal(void);


field_def fields_sw[] = {
	{"DISK", 6, 16, 1, FLD_ALIGN_LEFT, -1, 0, 0, 0},
	{"BLOCKS", 5, 10, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0},
	{"USED", 5, 10, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0},
	{"", 40, 80, 1, FLD_ALIGN_BAR, -1, 0, 0, 100},
};

#define FIELD_ADDR(x) (&fields_sw[x])

#define FLD_SW_NAME	FIELD_ADDR(0)
#define FLD_SW_BLOCKS	FIELD_ADDR(1)
#define FLD_SW_USED	FIELD_ADDR(2)
#define FLD_SW_BAR	FIELD_ADDR(3)

/* Define views */
field_def *view_sw_0[] = {
	FLD_SW_NAME, FLD_SW_BLOCKS, FLD_SW_USED, FLD_SW_BAR, NULL
};


/* Define view managers */
struct view_manager swap_mgr = {
	"Swap", select_sw, read_sw, NULL, print_header,
	print_sw, keyboard_callback, NULL, NULL
};

field_view views_sw[] = {
	{view_sw_0, "swap", '6', &swap_mgr},
	{NULL, NULL, 0, NULL}
};


int
select_sw(void)
{
	if (swap_devices == NULL || nswap == 0)
		num_disp = 1;
	else
		num_disp = nswap;
	if (nswap > 1)
		num_disp++;
	return (0);
}

int
read_sw(void)
{
	num_disp = 1;

	nswap = swapctl(SWAP_NSWAP, 0, 0);

	if (nswap < 0)
		error("error: %s", strerror(errno));
	if (nswap == 0)
		return 0;

	if (swap_devices)
		(void)free(swap_devices);

	swap_devices = (struct swapent *)calloc(nswap, sizeof(*swap_devices));
	if (swap_devices == NULL)
		return 0;

	rnswap = swapctl(SWAP_STATS, (void *)swap_devices, nswap);
	if (rnswap < 0 || nswap != rnswap)
		return 0;

	num_disp = nswap;
	if (nswap > 1)
		num_disp++;

	return 0;
}


void
print_sw(void)
{
	int n, count = 0;

	if (swap_devices == NULL || nswap == 0) {
		print_fld_str(FLD_SW_BAR, "No swap devices");
		return;
	}


	for (n = dispstart; n < num_disp; n++) {
		if (n >= nswap)
			showtotal();
		else
			showswap(n);
		count++;
		if (maxprint > 0 && count >= maxprint)
			break;
	}

}

int
initswap(void)
{
	field_view *v;

	char *bs = getbsize(&hlen, &blocksize);

	FLD_SW_BLOCKS->title = strdup(bs);

	for (v = views_sw; v->name != NULL; v++)
		add_view(v);

	return(1);
}


static void
showswap(int i)
{
	int div, used, xsize;
	struct	swapent *sep;
	char	*p;

	div = blocksize / 512;

	sep = &swap_devices[i];

	p = strrchr(sep->se_path, '/');
	p = p ? p+1 : sep->se_path;

	print_fld_str(FLD_SW_NAME, p);
	
	xsize = sep->se_nblks;
	used = sep->se_inuse;

	print_fld_uint(FLD_SW_BLOCKS, xsize / div);
	print_fld_uint(FLD_SW_USED, used / div);
	print_fld_bar(FLD_SW_BAR, 100 * used / xsize);

	end_line();
}

static void
showtotal(void)
{
	struct	swapent *sep;
	int	div, i, avail, used, xsize, free;

	div = blocksize / 512;
	free = avail = 0;

	for (sep = swap_devices, i = 0; i < nswap; i++, sep++) {
		xsize = sep->se_nblks;
		used = sep->se_inuse;
		avail += xsize;
		free += xsize - used;
	}
	used = avail - free;

	print_fld_str(FLD_SW_NAME, "Total");
	print_fld_uint(FLD_SW_BLOCKS, avail / div);
	print_fld_uint(FLD_SW_USED, used / div);
	print_fld_bar(FLD_SW_BAR, 100 * used / avail);

	end_line();
}