/*-
 * 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.
 *
 * @(#)cmds.c   8.2 (Berkeley) 4/29/95
 * $FreeBSD: src/usr.bin/systat/cmds.c,v 1.3 1999/08/28 01:05:58 peter Exp $
 * $DragonFly: src/usr.bin/systat/cmds.c,v 1.6 2008/11/10 04:59:45 swildner Exp $
 */

#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <ctype.h>
#include <string.h>
#include "systat.h"
#include "extern.h"

void
command(const char *cmd)
{
        struct cmdtab *p;
        char *cp;
        int omask;
        double interval;

        omask = sigblock(sigmask(SIGALRM));
        for (cp = __DECONST(char *, cmd); *cp && !isspace(*cp); cp++)
                ;
        if (*cp)
                *cp++ = '\0';
        if (*cmd == '\0')
                return;
        for (; *cp && isspace(*cp); cp++)
                ;
        if (strcmp(cmd, "quit") == 0 || strcmp(cmd, "q") == 0)
                die(0);
        if (strcmp(cmd, "load") == 0) {
                load();
                goto done;
        }
        if (strcmp(cmd, "stop") == 0) {
                alarm(0);
                mvaddstr(CMDLINE, 0, "Refresh disabled.");
                clrtoeol();
                goto done;
        }
        if (strcmp(cmd, "help") == 0) {
                int _col, _len;

                move(CMDLINE, _col = 0);
                for (p = cmdtab; p->c_name; p++) {
                        _len = strlen(p->c_name);
                        if (_col + _len > COLS)
                                break;
                        addstr(p->c_name); _col += _len;
                        if (_col + 1 < COLS)
                                addch(' ');
                }
                clrtoeol();
                goto done;
        }
        interval = strtod(cmd, NULL);
        if (interval <= 0.0 &&
            (strcmp(cmd, "start") == 0 || strcmp(cmd, "interval") == 0)) {
                interval = *cp ? strtod(cp, NULL) : naptime;
                if (interval <= 0.0) {
                        error("%3.2f: bad interval.", interval);
                        goto done;
                }
        }
        if (interval > 0.0) {
                alarm(0);
                naptime = interval;
                display(0);
                status();
                goto done;
        }
        p = lookup(cmd);
        if (p == (struct cmdtab *)-1) {
                error("%s: Ambiguous command.", cmd);
                goto done;
        }
        if (p) {
                if (curcmd == p)
                        goto done;
                alarm(0);
                (*curcmd->c_close)(wnd);
                wnd = (*p->c_open)();
                if (wnd == 0) {
                        error("Couldn't open new display");
                        wnd = (*curcmd->c_open)();
                        if (wnd == 0) {
                                error("Couldn't change back to previous cmd");
                                exit(1);
                        }
                        p = curcmd;
                }
                if ((p->c_flags & CF_INIT) == 0) {
                        if ((*p->c_init)())
                                p->c_flags |= CF_INIT;
                        else
                                goto done;
                }
                curcmd = p;
                labels();
                display(0);
                status();
                goto done;
        }
        if (curcmd->c_cmd == 0 || !(*curcmd->c_cmd)(cmd, cp))
                error("%s: Unknown command.", cmd);
done:
        sigsetmask(omask);
}

struct cmdtab *
lookup(const char *name)
{
        const char *p, *q;
        struct cmdtab *ct, *found;
        int nmatches, longest;

        longest = 0;
        nmatches = 0;
        found = NULL;
        for (ct = cmdtab; (p = ct->c_name); ct++) {
                for (q = name; *q == *p++; q++)
                        if (*q == 0)            /* exact match? */
                                return (ct);
                if (!*q) {                      /* the name was a prefix */
                        if (q - name > longest) {
                                longest = q - name;
                                nmatches = 1;
                                found = ct;
                        } else if (q - name == longest)
                                nmatches++;
                }
        }
        if (nmatches > 1)
                return ((struct cmdtab *)-1);
        return (found);
}

void
status(void)
{

        error("Showing %s, refresh every %3.2f seconds.",
          curcmd->c_name, naptime);
}

int
prefix(const char *s1, const char *s2)
{

        while (*s1 == *s2) {
                if (*s1 == '\0')
                        return (1);
                s1++, s2++;
        }
        return (*s1 == '\0');
}