/*-
 * 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 <stddef.h>
#include <stdio.h>
#include <string.h>

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

static void  binit(const char *);
static void  bput(const char *);
static const char *ccval(struct cchar *, int);

void
print(struct termios *tp, struct winsize *wp, int ldisc, enum FMT fmt)
{
        struct cchar *p;
        long tmp;
        u_char *cc;
        int cnt, ispeed, ospeed;
        char buf1[100], buf2[100];

        cnt = 0;

        /* Line discipline. */
        if (ldisc != TTYDISC) {
                switch(ldisc) {
                case SLIPDISC:
                        cnt += printf("slip disc; ");
                        break;
                case PPPDISC:
                        cnt += printf("ppp disc; ");
                        break;
                default:
                        cnt += printf("#%d disc; ", ldisc);
                        break;
                }
        }

        /* Line speed. */
        ispeed = cfgetispeed(tp);
        ospeed = cfgetospeed(tp);
        if (ispeed != ospeed)
                cnt +=
                    printf("ispeed %d baud; ospeed %d baud;", ispeed, ospeed);
        else
                cnt += printf("speed %d baud;", ispeed);
        if (fmt >= BSD)
                cnt += printf(" %d rows; %d columns;", wp->ws_row, wp->ws_col);
        if (cnt)
                (void)printf("\n");

#define on(f)   ((tmp & (f)) != 0)
#define put(n, f, d) \
        if (fmt >= BSD || on(f) != (d)) \
                bput((n) + on(f));

        /* "local" flags */
        tmp = tp->c_lflag;
        binit("lflags");
        put("-icanon", ICANON, 1);
        put("-isig", ISIG, 1);
        put("-iexten", IEXTEN, 1);
        put("-echo", ECHO, 1);
        put("-echoe", ECHOE, 0);
        put("-echok", ECHOK, 0);
        put("-echoke", ECHOKE, 0);
        put("-echonl", ECHONL, 0);
        put("-echoctl", ECHOCTL, 0);
        put("-echoprt", ECHOPRT, 0);
        put("-altwerase", ALTWERASE, 0);
        put("-noflsh", NOFLSH, 0);
        put("-tostop", TOSTOP, 0);
        put("-flusho", FLUSHO, 0);
        put("-pendin", PENDIN, 0);
        put("-nokerninfo", NOKERNINFO, 0);
        put("-extproc", EXTPROC, 0);

        /* input flags */
        tmp = tp->c_iflag;
        binit("iflags");
        put("-istrip", ISTRIP, 0);
        put("-icrnl", ICRNL, 1);
        put("-inlcr", INLCR, 0);
        put("-igncr", IGNCR, 0);
        put("-ixon", IXON, 1);
        put("-ixoff", IXOFF, 0);
        put("-ixany", IXANY, 1);
        put("-imaxbel", IMAXBEL, 1);
        put("-ignbrk", IGNBRK, 0);
        put("-brkint", BRKINT, 1);
        put("-inpck", INPCK, 0);
        put("-ignpar", IGNPAR, 0);
        put("-parmrk", PARMRK, 0);
        put("-iutf8", IUTF8, 1);

        /* output flags */
        tmp = tp->c_oflag;
        binit("oflags");
        put("-opost", OPOST, 1);
        put("-onlcr", ONLCR, 1);
        put("-ocrnl", OCRNL, 0);
        switch(tmp&TABDLY) {
        case TAB0:
                bput("tab0");
                break;
        case TAB3:
                bput("tab3");
                break;
        }
        put("-onocr", ONOCR, 0);
        put("-onlret", ONLRET, 0);

        /* control flags (hardware state) */
        tmp = tp->c_cflag;
        binit("cflags");
        put("-cread", CREAD, 1);
        switch(tmp&CSIZE) {
        case CS5:
                bput("cs5");
                break;
        case CS6:
                bput("cs6");
                break;
        case CS7:
                bput("cs7");
                break;
        case CS8:
                bput("cs8");
                break;
        }
        bput("-parenb" + on(PARENB));
        put("-parodd", PARODD, 0);
        put("-hupcl", HUPCL, 1);
        put("-clocal", CLOCAL, 0);
        put("-cstopb", CSTOPB, 0);
        switch(tmp & (CCTS_OFLOW | CRTS_IFLOW)) {
        case CCTS_OFLOW:
                bput("ctsflow");
                break;
        case CRTS_IFLOW:
                bput("rtsflow");
                break;
        default:
                put("-crtscts", CCTS_OFLOW | CRTS_IFLOW, 0);
                break;
        }
        put("-dsrflow", CDSR_OFLOW, 0);
        put("-dtrflow", CDTR_IFLOW, 0);
        put("-mdmbuf", MDMBUF, 0);      /* XXX mdmbuf ==  dtrflow */
        if (on(CNO_RTSDTR))
                bput("-rtsdtr");
        else {
                if (fmt >= BSD)
                        bput("rtsdtr");
        }

        /* special control characters */
        cc = tp->c_cc;
        if (fmt == POSIX) {
                binit("cchars");
                for (p = cchars1; p->name; ++p) {
                        (void)snprintf(buf1, sizeof(buf1), "%s = %s;",
                            p->name, ccval(p, cc[p->sub]));
                        bput(buf1);
                }
                binit(NULL);
        } else {
                binit(NULL);
                for (p = cchars1, cnt = 0; p->name; ++p) {
                        if (fmt != BSD && cc[p->sub] == p->def)
                                continue;
#define WD      "%-8s"
                        (void)snprintf(buf1 + cnt * 8, sizeof(buf1) - cnt * 8,
                            WD, p->name);
                        (void)snprintf(buf2 + cnt * 8, sizeof(buf2) - cnt * 8,
                            WD, ccval(p, cc[p->sub]));
                        if (++cnt == LINELENGTH / 8) {
                                cnt = 0;
                                (void)printf("%s\n", buf1);
                                (void)printf("%s\n", buf2);
                        }
                }
                if (cnt) {
                        (void)printf("%s\n", buf1);
                        (void)printf("%s\n", buf2);
                }
        }
}

static int col;
static const char *label;

static void
binit(const char *lb)
{

        if (col) {
                (void)printf("\n");
                col = 0;
        }
        label = lb;
}

static void
bput(const char *s)
{

        if (col == 0) {
                col = printf("%s: %s", label, s);
                return;
        }
        if ((col + strlen(s)) > LINELENGTH) {
                (void)printf("\n\t");
                col = printf("%s", s) + 8;
                return;
        }
        col += printf(" %s", s);
}

static const char *
ccval(struct cchar *p, int c)
{
        static char buf[5];
        char *bp;

        if (p->sub == VMIN || p->sub == VTIME) {
                (void)snprintf(buf, sizeof(buf), "%d", c);
                return (buf);
        }
        if (c == _POSIX_VDISABLE)
                return ("<undef>");
        bp = buf;
        if (c & 0200) {
                *bp++ = 'M';
                *bp++ = '-';
                c &= 0177;
        }
        if (c == 0177) {
                *bp++ = '^';
                *bp++ = '?';
        }
        else if (c < 040) {
                *bp++ = '^';
                *bp++ = c + '@';
        }
        else
                *bp++ = c;
        *bp = '\0';
        return (buf);
}