/*-
 * 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.
 *
 * @(#) Copyright (c) 1980, 1992, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)main.c   8.1 (Berkeley) 6/6/93
 * $FreeBSD: src/usr.bin/systat/main.c,v 1.11.2.1 2001/06/06 20:26:01 tmm Exp $
 */

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

#include <err.h>
#include <limits.h>
#include <locale.h>
#include <nlist.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "systat.h"
#include "extern.h"

static struct nlist namelist[] = {
#define X_FIRST         0
#define X_HZ            0
        { .n_name = "_hz" },
#define X_STATHZ                1
        { .n_name = "_stathz" },
        { .n_name = "" }
};
static int     dellave;

kvm_t *kd;
sig_t   sigtstpdfl;
double avenrun[3];
int     WideMode;
int     col;
double  naptime = 5.0;
int     verbose = 1;                    /* to report kvm read errs */
int     hz, stathz;
double  hertz;
char    c;
char    *namp;
char    hostname[MAXHOSTNAMELEN];
WINDOW  *wnd;
int     CMDLINE;

static  WINDOW *wload;                  /* one line window for load average */

int
main(int argc, char **argv)
{
        char errbuf[_POSIX2_LINE_MAX];
        char *op;

        setlocale(LC_TIME, "");

        argc--, argv++;
        while (argc > 0) {
                op = argv[0];

                if (op[0] == '-' && op[1] && op[2] == 0) {
                        switch(op[1]) {
                        case 'w':
                                WideMode = 1;
                                break;
                        default:
                                fprintf(stderr,
                                        "systat [-w] -cmd [interval]\n");
                                fprintf(stderr,
                                        "       -pigs\n"
                                        "       -swap\n"
                                        "       -mb\n"
                                        "       -io\n"
                                        "       -vm\n"
                                        "       -pv\n"
                                        "       -netstat\n"
                                        "       -netbw\n"
                                        "       -pf\n"
                                        "       -icmp\n"
                                        "       -ip\n"
                                        "       -tcp\n"
                                        "       -ifstat\n"
                                        "       -altqs\n"
                                        "       -ip6\n"
                                        "       -icmp6\n"
                                        "       -sensors\n");
                                exit(1);
                        }
                } else if (op[0] == '-') {
                        struct cmdtab *p;

                        p = lookup(&argv[0][1]);
                        if (p == (struct cmdtab *)-1)
                                errx(1, "%s: ambiguous request", &argv[0][1]);
                        if (p == NULL)
                                errx(1, "%s: unknown request", &argv[0][1]);
                        curcmd = p;
                } else {
                        naptime = strtod(argv[0], NULL);
                        if (naptime <= 0.0)
                                naptime = 5.0;
                }
                argc--, argv++;
        }
        kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf);
        if (kd == NULL) {
                error("%s", errbuf);
                exit(1);
        }
        signal(SIGINT, die);
        signal(SIGQUIT, die);
        signal(SIGTERM, die);

        /*
         * Initialize display.  Load average appears in a one line
         * window of its own.  Current command's display appears in
         * an overlapping sub-window of stdscr configured by the display
         * routines to minimize update work by curses.
         */
        initscr();
        CMDLINE = LINES - 1;
        wnd = (*curcmd->c_open)();
        if (wnd == NULL) {
                warnx("couldn't initialize display");
                die(0);
        }
        wload = newwin(1, 0, 3, 20);
        if (wload == NULL) {
                warnx("couldn't set up load average window");
                die(0);
        }
        if (kvm_nlist(kd, namelist)) {
                nlisterr(namelist);
                exit(1);
        }
        if (namelist[X_FIRST].n_type == 0)
                errx(1, "couldn't read namelist");
        gethostname(hostname, sizeof (hostname));
        NREAD(X_HZ, &hz, sizeof(hz));
        NREAD(X_STATHZ, &stathz, sizeof(stathz));
        hertz = stathz ? stathz : hz;
        (*curcmd->c_init)();
        curcmd->c_flags |= CF_INIT;
        labels();

        dellave = 0.0;

        signal(SIGALRM, display);
        display(0);
        noecho();
        crmode();
        keyboard();
        /*NOTREACHED*/

        return EXIT_SUCCESS;
}

void
labels(void)
{
        if (curcmd->c_flags & CF_LOADAV) {
                mvaddstr(2, 20,
                    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
                mvaddstr(3, 5, "Load Average");
        }
        (*curcmd->c_label)();
#ifdef notdef
        mvprintw(21, 25, "CPU usage on %s", hostname);
#endif
        refresh();
}

void
display(int signo __unused)
{
        int i, j;
        struct itimerval ctv;

        /* Get the load average over the last minute. */
        (void) getloadavg(avenrun, NELEM(avenrun));
        (*curcmd->c_fetch)();
        if (curcmd->c_flags & CF_LOADAV) {
                j = 5.0*avenrun[0] + 0.5;
                dellave = avenrun[0];
                c = '|';
                wmove(wload, 0, 0); wclrtoeol(wload);
                for (i = (j > 50) ? 50 : j; i > 0; i--)
                        waddch(wload, c);
                if (j > 50)
                        wprintw(wload, " %4.1f", avenrun[0]);
        }
        (*curcmd->c_refresh)();
        if (curcmd->c_flags & CF_LOADAV)
                wrefresh(wload);
        wrefresh(wnd);
        move(CMDLINE, col);
        refresh();
        ctv.it_interval.tv_sec = 0;
        ctv.it_interval.tv_usec = 0;
        ctv.it_value.tv_sec = (int)naptime;
        ctv.it_value.tv_usec = (naptime - (double)(int)naptime) * 1000000.0;
        setitimer(ITIMER_REAL, &ctv, NULL);
}

void
load(void)
{

        (void) getloadavg(avenrun, NELEM(avenrun));
        mvprintw(CMDLINE, 0, "%4.1f %4.1f %4.1f",
            avenrun[0], avenrun[1], avenrun[2]);
        clrtoeol();
}

void
die(int signo __unused)
{
        move(CMDLINE, 0);
        clrtoeol();
        refresh();
        endwin();
        exit(0);
}

#include <stdarg.h>

void
error(const char *fmt, ...)
{
        va_list ap;
        char buf[255];
        int oy, ox;
        va_start(ap, fmt);

        if (wnd) {
                getyx(stdscr, oy, ox);
                (void) vsnprintf(buf, sizeof(buf), fmt, ap);
                clrtoeol();
                standout();
                mvaddstr(CMDLINE, 0, buf);
                standend();
                move(oy, ox);
                refresh();
        } else {
                (void) vfprintf(stderr, fmt, ap);
                fprintf(stderr, "\n");
        }
        va_end(ap);
}

void
nlisterr(struct nlist *n_list)
{
        int i, n;

        n = 0;
        clear();
        mvprintw(2, 10, "systat: nlist: can't find following symbols:");
        for (i = 0;
            n_list[i].n_name != NULL && *n_list[i].n_name != '\0'; i++)
                if (n_list[i].n_value == 0)
                        mvprintw(2 + ++n, 10, "%s", n_list[i].n_name);
        move(CMDLINE, 0);
        clrtoeol();
        refresh();
        endwin();
        exit(1);
}