/*      $NetBSD: iostat.c,v 1.39 2019/01/25 15:31:11 christos 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. 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>
#ifndef lint
#if 0
static char sccsid[] = "@(#)iostat.c    8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: iostat.c,v 1.39 2019/01/25 15:31:11 christos Exp $");
#endif /* not lint */

#include <sys/param.h>

#include <string.h>

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

static  int linesperregion;
static  int numbers = 0;                /* default display bar graphs */
static  int secs = 0;                   /* default seconds shown */
static  int read_write = 0;             /* default read/write 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(void)
{

       return (subwin(stdscr, -1, 0, 5, 0));
}

void
closeiostat(WINDOW *w)
{

       if (w == NULL)
               return;
       wclear(w);
       wrefresh(w);
       delwin(w);
}

int
initiostat(void)
{

       drvinit(1);
       cpureadstats();
       drvreadstats();
       return(1);
}

void
fetchiostat(void)
{

       cpureadstats();

       if (ndrive != 0)
               drvreadstats();
}

#define INSET   14

void
labeliostat(void)
{
       int row;

       if (ndrive == 0) {
               error("No drives defined.");
               return;
       }
       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(int row)
{
       int col, regions;
       size_t i, ndrives;

#define COLWIDTH        (9 + secs * 5 + 1 + read_write * 9 + 1)
#define DRIVESPERLINE   ((getmaxx(wnd) + 1) / COLWIDTH)
       for (ndrives = 0, i = 0; i < ndrive; i++)
               if (cur.select[i])
                       ndrives++;

       regions = howmany(ndrives, DRIVESPERLINE);
       /*
        * Deduct -regions for blank line after each scrolling region.
        */
       linesperregion = (getmaxy(wnd) - row - regions + 1) / regions;
       /*
        * Minimum region contains space for two
        * label lines and one line of statistics.
        */
       if (linesperregion < 3)
               linesperregion = 3;
       col = 0;
       for (i = 0; i < ndrive; i++)
               if (cur.select[i]) {
                       if (col + COLWIDTH - 1 > getmaxx(wnd)) {
                               col = 0, row += linesperregion + 1;
                               if (row > getmaxy(wnd) - (linesperregion))
                                       break;
                       }

                       mvwprintw(wnd, row, col + 5, "%s", cur.name[i]);

                       if (read_write)
                               mvwprintw(wnd, row, col + 11 + secs * 5,
                                   "(write)");
                       mvwprintw(wnd, row + 1, col, " kBps %s",
                               read_write ? "r/s" : "tps");
                       if (secs)
                               waddstr(wnd, "  sec");
                       if (read_write)
                               waddstr(wnd, "  kBps w/s");
                       col += COLWIDTH;
               }
       if (col)
               row += linesperregion + 1;
       return (row);
}

static int
barlabels(int row)
{
       size_t i;

       mvwaddstr(wnd, row++, INSET,
           "/0   /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
       linesperregion = 2 + secs + (read_write ? 2 : 0);
       for (i = 0; i < ndrive; i++) {
               if (cur.select[i]) {
                       if (row > getmaxy(wnd) - linesperregion)
                               break;
                       mvwprintw(wnd, row++, 0, "%7.7s  kBps|",
                           cur.name[i]);
                       mvwaddstr(wnd, row++, 0, "          tps|");
                       if (read_write) {
                               mvwprintw(wnd, row++, 0, " (write) kBps|");
                               mvwaddstr(wnd, row++, 0, "          tps|");
                       }
                       if (secs)
                               mvwaddstr(wnd, row++, 0, "         msec|");
               }
       }

       return (row);
}

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

       if (ndrive == 0)
               return;
       cpuswap();
       drvswap();

       etime = cur.cp_etime;
       row = 1;

       /*
        * Interrupt CPU state not calculated yet.
        */
       for (i = 0; i < CPUSTATES; i++)
               stat1(row++, i);
       if (!numbers) {
               row += 2;
               for (i = 0; i < ndrive; i++)
                       if (cur.select[i]) {
                               if (row > getmaxy(wnd) - linesperregion)
                                       break;
                               row = stats(row, INSET, i);
                       }
               return;
       }
       col = 0;
       wmove(wnd, row + linesperregion, 0);
       wdeleteln(wnd);
       wmove(wnd, row + 3, 0);
       winsertln(wnd);
       for (i = 0; i < ndrive; i++)
               if (cur.select[i]) {
                       if (col + COLWIDTH - 1 > getmaxx(wnd)) {
                               col = 0, row += linesperregion + 1;
                               if (row > getmaxy(wnd) - (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(int row, int col, int dn)
{
       double atime, dtime, rwords, wwords;
       uint64_t rxfer;

       /* elapsed time for disk stats */
       dtime = etime;
       if (cur.timestamp[dn].tv_sec || cur.timestamp[dn].tv_usec)
               dtime = (double)cur.timestamp[dn].tv_sec +
                       ((double)cur.timestamp[dn].tv_usec / (double)1000000);

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

       /* # of k transferred */
       rwords = cur.rbytes[dn] / 1024.0;
       wwords = cur.wbytes[dn] / 1024.0;
       rxfer = cur.rxfer[dn];
       if (!read_write) {
               rwords += wwords;
               rxfer += cur.wxfer[dn];
       }
       if (numbers) {
               mvwprintw(wnd, row, col, "%5.0f%4.0f",
                   rwords / dtime, rxfer / dtime);
               if (secs)
                       wprintw(wnd, "%5.1f", atime / dtime);
               if (read_write)
                       wprintw(wnd, " %5.0f%4.0f",
                           wwords / dtime, cur.wxfer[dn] / dtime);
               return (row);
       }

       wmove(wnd, row++, col);
       histogram(rwords / dtime, 50, 0.5);
       wmove(wnd, row++, col);
       histogram(rxfer / dtime, 50, 0.5);
       if (read_write) {
               wmove(wnd, row++, col);
               histogram(wwords / dtime, 50, 0.5);
               wmove(wnd, row++, col);
               histogram(cur.wxfer[dn] / dtime, 50, 0.5);
       }

       if (secs) {
               wmove(wnd, row++, col);
               atime *= 1000;  /* In milliseconds */
               histogram(atime / dtime, 50, 0.5);
       }
       return (row);
}

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

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

static void
histogram(double val, int colwidth, double scale)
{
       int v = (int)(val * scale + 0.5);
       int factor = 1;
       int y, x;

       while (v > colwidth) {
               v = (v + 5) / 10;
               factor *= 10;
       }
       getyx(wnd, y, x);
       wclrtoeol(wnd);
       whline(wnd, 'X', v);
       if (factor != 1)
               mvwprintw(wnd, y, x + colwidth + 1, "* %d ", factor);
}

void
iostat_bars(char *args)
{
       numbers = 0;
       wclear(wnd);
       labeliostat();
       refresh();
}

void
iostat_numbers(char *args)
{
       numbers = 1;
       wclear(wnd);
       labeliostat();
       refresh();
}

void
iostat_secs(char *args)
{
       secs = !secs;
       wclear(wnd);
       labeliostat();
       refresh();
}

void
iostat_rw(char *args)
{
       read_write ^= 1;
       wclear(wnd);
       labeliostat();
       refresh();
}

void
iostat_all(char *args)
{
       read_write = 0;
       wclear(wnd);
       labeliostat();
       refresh();
}

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