/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1991, 1993, 1994
 *      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/types.h>

#include <err.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "stty.h"
#include "extern.h"

__BEGIN_DECLS
static int c_key(const void *, const void *);
void    f_all(struct info *);
void    f_cbreak(struct info *);
void    f_columns(struct info *);
void    f_dec(struct info *);
void    f_ek(struct info *);
void    f_everything(struct info *);
void    f_extproc(struct info *);
void    f_ispeed(struct info *);
void    f_nl(struct info *);
void    f_ospeed(struct info *);
void    f_raw(struct info *);
void    f_rows(struct info *);
void    f_sane(struct info *);
void    f_size(struct info *);
void    f_speed(struct info *);
void    f_tty(struct info *);
__END_DECLS

static struct key {
        const char *name;                       /* name */
        void (*f)(struct info *);               /* function */
#define F_NEEDARG       0x01                    /* needs an argument */
#define F_OFFOK         0x02                    /* can turn off */
        int flags;
} keys[] = {
        { "all",        f_all,          0 },
        { "cbreak",     f_cbreak,       F_OFFOK },
        { "cols",       f_columns,      F_NEEDARG },
        { "columns",    f_columns,      F_NEEDARG },
        { "cooked",     f_sane,         0 },
        { "dec",        f_dec,          0 },
        { "ek",         f_ek,           0 },
        { "everything", f_everything,   0 },
        { "extproc",    f_extproc,      F_OFFOK },
        { "ispeed",     f_ispeed,       F_NEEDARG },
        { "new",        f_tty,          0 },
        { "nl",         f_nl,           F_OFFOK },
        { "old",        f_tty,          0 },
        { "ospeed",     f_ospeed,       F_NEEDARG },
        { "raw",        f_raw,          F_OFFOK },
        { "rows",       f_rows,         F_NEEDARG },
        { "sane",       f_sane,         0 },
        { "size",       f_size,         0 },
        { "speed",      f_speed,        0 },
        { "tty",        f_tty,          0 },
};

static int
c_key(const void *a, const void *b)
{

        return (strcmp(((const struct key *)a)->name, ((const struct key *)b)->name));
}

int
ksearch(char ***argvp, struct info *ip)
{
        char *name;
        struct key *kp, tmp;

        name = **argvp;
        if (*name == '-') {
                ip->off = 1;
                ++name;
        } else
                ip->off = 0;

        tmp.name = name;
        if (!(kp = (struct key *)bsearch(&tmp, keys,
            sizeof(keys)/sizeof(struct key), sizeof(struct key), c_key)))
                return (0);
        if (!(kp->flags & F_OFFOK) && ip->off) {
                warnx("illegal option -- -%s", name);
                usage();
        }
        if (kp->flags & F_NEEDARG && !(ip->arg = *++*argvp)) {
                warnx("option requires an argument -- %s", name);
                usage();
        }
        kp->f(ip);
        return (1);
}

void
f_all(struct info *ip)
{
        print(&ip->t, &ip->win, ip->ldisc, BSD);
}

void
f_cbreak(struct info *ip)
{

        if (ip->off)
                f_sane(ip);
        else {
                ip->t.c_iflag |= BRKINT|IXON|IMAXBEL;
                ip->t.c_oflag |= OPOST;
                ip->t.c_lflag |= ISIG|IEXTEN;
                ip->t.c_lflag &= ~ICANON;
                ip->set = 1;
        }
}

void
f_columns(struct info *ip)
{

        ip->win.ws_col = atoi(ip->arg);
        ip->wset = 1;
}

void
f_dec(struct info *ip)
{

        ip->t.c_cc[VERASE] = (u_char)0177;
        ip->t.c_cc[VKILL] = CTRL('u');
        ip->t.c_cc[VINTR] = CTRL('c');
        ip->t.c_lflag &= ~ECHOPRT;
        ip->t.c_lflag |= ECHOE|ECHOKE|ECHOCTL;
        ip->t.c_iflag &= ~IXANY;
        ip->set = 1;
}

void
f_ek(struct info *ip)
{

        ip->t.c_cc[VERASE] = CERASE;
        ip->t.c_cc[VKILL] = CKILL;
        ip->set = 1;
}

void
f_everything(struct info *ip)
{

        print(&ip->t, &ip->win, ip->ldisc, BSD);
}

void
f_extproc(struct info *ip)
{

        if (ip->off) {
                int tmp = 0;
                (void)ioctl(ip->fd, TIOCEXT, &tmp);
        } else {
                int tmp = 1;
                (void)ioctl(ip->fd, TIOCEXT, &tmp);
        }
}

void
f_ispeed(struct info *ip)
{

        cfsetispeed(&ip->t, (speed_t)atoi(ip->arg));
        ip->set = 1;
}

void
f_nl(struct info *ip)
{

        if (ip->off) {
                ip->t.c_iflag |= ICRNL;
                ip->t.c_oflag |= ONLCR;
        } else {
                ip->t.c_iflag &= ~ICRNL;
                ip->t.c_oflag &= ~ONLCR;
        }
        ip->set = 1;
}

void
f_ospeed(struct info *ip)
{

        cfsetospeed(&ip->t, (speed_t)atoi(ip->arg));
        ip->set = 1;
}

void
f_raw(struct info *ip)
{

        if (ip->off)
                f_sane(ip);
        else {
                cfmakeraw(&ip->t);
                ip->t.c_cflag &= ~(CSIZE|PARENB);
                ip->t.c_cflag |= CS8;
                ip->set = 1;
        }
}

void
f_rows(struct info *ip)
{

        ip->win.ws_row = atoi(ip->arg);
        ip->wset = 1;
}

void
f_sane(struct info *ip)
{
        struct termios def;

        cfmakesane(&def);
        ip->t.c_cflag = def.c_cflag | (ip->t.c_cflag & CLOCAL);
        ip->t.c_iflag = def.c_iflag;
        /* preserve user-preference flags in lflag */
#define LKEEP   (ECHOKE|ECHOE|ECHOK|ECHOPRT|ECHOCTL|ALTWERASE|TOSTOP|NOFLSH)
        ip->t.c_lflag = def.c_lflag | (ip->t.c_lflag & LKEEP);
        ip->t.c_oflag = def.c_oflag;
        ip->set = 1;
}

void
f_size(struct info *ip)
{

        (void)printf("%d %d\n", ip->win.ws_row, ip->win.ws_col);
}

void
f_speed(struct info *ip)
{

        (void)printf("%lu\n", (u_long)cfgetospeed(&ip->t));
}

void
f_tty(struct info *ip)
{
        int tmp;

        tmp = TTYDISC;
        if (ioctl(ip->fd, TIOCSETD, &tmp) < 0)
                err(1, "TIOCSETD");
}