/*-
 * 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.
 *
 * @(#)swap.c   8.3 (Berkeley) 4/29/95
 * $FreeBSD: src/usr.bin/systat/swap.c,v 1.12.2.2 2001/07/04 22:54:14 kris Exp $
 */

/*
 * swapinfo - based on a program of the same name by Kevin Lahey
 */

#include <sys/param.h>
#include <sys/conf.h>
#include <sys/ioctl.h>
#include <sys/stat.h>

#include <kvm.h>
#include <nlist.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <err.h>

#include "systat.h"
#include "extern.h"

void showspace(char *header, int hlen, long blocksize);

static long blocksize;
static int hlen;

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

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

/*
 * The meat of all the swap stuff is stolen from pstat(8)'s
 * swapmode(), which is based on a program called swapinfo written by
 * Kevin Lahey <kml@rokkaku.atl.ga.us>.
 */

int
initswap(void)
{
        char msgbuf[BUFSIZ];
        static int once = 0;
        struct kvm_swap dummy;

        if (once)
                return (1);

        if (kvm_getswapinfo(kd, &dummy, 1, 0) < 0) {
                snprintf(msgbuf, sizeof(msgbuf), "systat: kvm_getswapinfo failed");
                error("%s", msgbuf);
                return (0);
        }

        once = 1;
        return (1);
}

static struct kvm_swap  kvmsw[16];
static int kvnsw;

void
fetchswap(void)
{
        kvnsw = kvm_getswapinfo(kd, kvmsw, 16, 0);
}

void
labelswap(void)
{
        char *header;
        int row, i;

        fetchswap();

        row = 0;
        wmove(wnd, row, 0); wclrtobot(wnd);
        header = getbsize(&hlen, &blocksize);
        mvwprintw(wnd, row++, 0, "%-5s%*s%9s %55s",
            "Disk", hlen, header, "Used",
            "/0%  /10% /20% /30% /40% /50% /60% /70% /80% /90% /100");

        for (i = 0; i < kvnsw; ++i) {
                mvwprintw(wnd, i + 1, 0, "%-5s", kvmsw[i].ksw_devname);
        }
}

void
showswap(void)
{
        int i;
        int pagesize = getpagesize();

#define CONVERT(v)      ((int)((quad_t)(v) * pagesize / blocksize))

        for (i = 0; i <= kvnsw; ++i) {
                int _col = 5;
                int count;

                if (i == kvnsw) {
                        if (kvnsw == 1)
                                break;
                        mvwprintw(
                            wnd,
                            i + 1,
                            0,
                            "%-5s",
                            "Total"
                        );
                }
                if (kvmsw[i].ksw_total == 0) {
                        mvwprintw(
                            wnd,
                            i + 1,
                            _col + 5,
                            "(swap not configured)"
                        );
                        continue;
                }

                mvwprintw(
                    wnd, 
                    i + 1, 
                    _col,
                    "%*d",
                    hlen, 
                    CONVERT(kvmsw[i].ksw_total)
                );
                _col += hlen;

                mvwprintw(
                    wnd,
                    i + 1,
                    _col, 
                    "%9d  ",
                    CONVERT(kvmsw[i].ksw_used)
                );

                count = (int)((double)kvmsw[i].ksw_used * 49.999 /
                    (double)kvmsw[i].ksw_total);

                while (count >= 0) {
                        waddch(wnd, 'X');
                        --count;
                }
        }
}