/*      $OpenBSD: subr.c,v 1.29 2024/11/09 11:22:18 miod Exp $  */

/*
 * Copyright (c) 1983, 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.
 */

/*
 * Melbourne getty.
 */
#include <sys/ioctl.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <poll.h>
#include <termios.h>

#include "gettytab.h"
#include "pathnames.h"
#include "extern.h"

extern  struct termios tmode, omode;

/*
 * Get a table entry.
 */
void
gettable(char *name, char *buf)
{
        struct gettystrs *sp;
        struct gettynums *np;
        struct gettyflags *fp;
        long n;
        char *dba[2];
        dba[0] = _PATH_GETTYTAB;
        dba[1] = NULL;

        if (cgetent(&buf, dba, name) != 0)
                return;

        for (sp = gettystrs; sp->field; sp++)
                cgetstr(buf, sp->field, &sp->value);
        for (np = gettynums; np->field; np++) {
                if (cgetnum(buf, np->field, &n) == -1)
                        np->set = 0;
                else {
                        np->set = 1;
                        np->value = n;
                }
        }
        for (fp = gettyflags; fp->field; fp++) {
                if (cgetcap(buf, fp->field, ':') == NULL)
                        fp->set = 0;
                else {
                        fp->set = 1;
                        fp->value = 1 ^ fp->invrt;
                }
        }
#ifdef DEBUG
        printf("name=\"%s\", buf=\"%s\"\n", name, buf);
        for (sp = gettystrs; sp->field; sp++)
                printf("cgetstr: %s=%s\n", sp->field, sp->value);
        for (np = gettynums; np->field; np++)
                printf("cgetnum: %s=%d\n", np->field, np->value);
        for (fp = gettyflags; fp->field; fp++)
                printf("cgetflags: %s='%c' set='%c'\n", fp->field,
                    fp->value + '0', fp->set + '0');
        exit(1);
#endif /* DEBUG */
}

void
gendefaults(void)
{
        struct gettystrs *sp;
        struct gettynums *np;
        struct gettyflags *fp;

        for (sp = gettystrs; sp->field; sp++)
                if (sp->value)
                        sp->defalt = sp->value;
        for (np = gettynums; np->field; np++)
                if (np->set)
                        np->defalt = np->value;
        for (fp = gettyflags; fp->field; fp++)
                if (fp->set)
                        fp->defalt = fp->value;
                else
                        fp->defalt = fp->invrt;
}

void
setdefaults(void)
{
        struct gettystrs *sp;
        struct gettynums *np;
        struct gettyflags *fp;

        for (sp = gettystrs; sp->field; sp++)
                if (!sp->value)
                        sp->value = sp->defalt;
        for (np = gettynums; np->field; np++)
                if (!np->set)
                        np->value = np->defalt;
        for (fp = gettyflags; fp->field; fp++)
                if (!fp->set)
                        fp->value = fp->defalt;
}

static char **
charnames[] = {
        &ER, &KL, &IN, &QU, &XN, &XF, &ET, &BK,
        &SU, &DS, &RP, &FL, &WE, &LN, 0
};

static char *
charvars[] = {
        &tmode.c_cc[VERASE], &tmode.c_cc[VKILL], &tmode.c_cc[VINTR],
        &tmode.c_cc[VQUIT], &tmode.c_cc[VSTART], &tmode.c_cc[VSTOP],
        &tmode.c_cc[VEOF], &tmode.c_cc[VEOL], &tmode.c_cc[VSUSP],
        &tmode.c_cc[VDSUSP], &tmode.c_cc[VREPRINT], &tmode.c_cc[VDISCARD],
        &tmode.c_cc[VWERASE], &tmode.c_cc[VLNEXT], 0
};

void
setchars(void)
{
        int i;
        char *p;

        for (i = 0; charnames[i]; i++) {
                p = *charnames[i];
                if (p && *p)
                        *charvars[i] = *p;
                else
                        *charvars[i] = _POSIX_VDISABLE;
        }
}

/* Macros to clear/set/test flags. */
#define SET(t, f)       (t) |= (f)
#define CLR(t, f)       (t) &= ~(f)
#define ISSET(t, f)     ((t) & (f))

void
setflags(int n)
{
        tcflag_t iflag, oflag, cflag, lflag;

        switch (n) {
        case 0:
                if (C0set && I0set && L0set && O0set) {
                        tmode.c_cflag = C0;
                        tmode.c_iflag = I0;
                        tmode.c_lflag = L0;
                        tmode.c_oflag = O0;
                        return;
                }
                break;
        case 1:
                if (C1set && I1set && L1set && O1set) {
                        tmode.c_cflag = C1;
                        tmode.c_iflag = I1;
                        tmode.c_lflag = L1;
                        tmode.c_oflag = O1;
                        return;
                }
                break;
        default:
                if (C2set && I2set && L2set && O2set) {
                        tmode.c_cflag = C2;
                        tmode.c_iflag = I2;
                        tmode.c_lflag = L2;
                        tmode.c_oflag = O2;
                        return;
                }
                break;
        }

        iflag = omode.c_iflag;
        oflag = omode.c_oflag;
        cflag = omode.c_cflag;
        lflag = omode.c_lflag;

        if (NP) {
                CLR(cflag, CSIZE|PARENB);
                SET(cflag, CS8);
                CLR(iflag, ISTRIP|INPCK|IGNPAR);
        } else if (AP || EP || OP) {
                CLR(cflag, CSIZE);
                SET(cflag, CS7|PARENB);
                SET(iflag, ISTRIP);
                if (OP && !EP) {
                        SET(iflag, INPCK|IGNPAR);
                        SET(cflag, PARODD);
                        if (AP)
                                CLR(iflag, INPCK);
                } else if (EP && !OP) {
                        SET(iflag, INPCK|IGNPAR);
                        CLR(cflag, PARODD);
                        if (AP)
                                CLR(iflag, INPCK);
                } else if (AP || (EP && OP)) {
                        CLR(iflag, INPCK|IGNPAR);
                        CLR(cflag, PARODD);
                }
        } /* else, leave as is */

        if (UC) {
                SET(iflag, IUCLC);
                SET(oflag, OLCUC);
                SET(lflag, XCASE);
        }

        if (HC)
                SET(cflag, HUPCL);
        else
                CLR(cflag, HUPCL);

        if (MB)
                SET(cflag, MDMBUF);
        else
                CLR(cflag, MDMBUF);

        if (NL) {
                SET(iflag, ICRNL);
                SET(oflag, ONLCR|OPOST);
        } else {
                CLR(iflag, ICRNL);
                CLR(oflag, ONLCR);
        }

        if (!HT)
                SET(oflag, OXTABS|OPOST);
        else
                CLR(oflag, OXTABS);


        if (n == 1) {           /* read mode flags */
                if (RW) {
                        iflag = 0;
                        CLR(oflag, OPOST);
                        CLR(cflag, CSIZE|PARENB);
                        SET(cflag, CS8);
                        lflag = 0;
                } else {
                        CLR(lflag, ICANON);
                }
                goto out;
        }

        if (n == 0)
                goto out;

#if 0
        if (CB)
                SET(f, CRTBS);
#endif

        if (CE)
                SET(lflag, ECHOE);
        else
                CLR(lflag, ECHOE);

        if (CK)
                SET(lflag, ECHOKE);
        else
                CLR(lflag, ECHOKE);

        if (PE)
                SET(lflag, ECHOPRT);
        else
                CLR(lflag, ECHOPRT);

        if (EC)
                SET(lflag, ECHO);
        else
                CLR(lflag, ECHO);

        if (XC)
                SET(lflag, ECHOCTL);
        else
                CLR(lflag, ECHOCTL);

        if (DX)
                CLR(lflag, IXANY);
        else
                SET(lflag, IXANY);

out:
        tmode.c_iflag = iflag;
        tmode.c_oflag = oflag;
        tmode.c_cflag = cflag;
        tmode.c_lflag = lflag;
}


void
makeenv(char *env[])
{
        static char termbuf[128] = "TERM=";
        char *p, *q;
        char **ep;

        ep = env;
        if (TT && *TT) {
                strlcat(termbuf, TT, sizeof(termbuf));
                *ep++ = termbuf;
        }
        if ((p = EV)) {
                q = p;
                while ((q = strchr(q, ','))) {
                        *q++ = '\0';
                        *ep++ = p;
                        p = q;
                }
                if (*p)
                        *ep++ = p;
        }
        *ep = NULL;
}

/*
 * This speed select mechanism is written for the Develcon DATASWITCH.
 * The Develcon sends a string of the form "B{speed}\n" at a predefined
 * baud rate. This string indicates the user's actual speed.
 * The routine below returns the terminal type mapped from derived speed.
 */
struct  portselect {
        char    *ps_baud;
        char    *ps_type;
} portspeeds[] = {
        { "B110",       "std.110" },
        { "B134",       "std.134" },
        { "B150",       "std.150" },
        { "B300",       "std.300" },
        { "B600",       "std.600" },
        { "B1200",      "std.1200" },
        { "B2400",      "std.2400" },
        { "B4800",      "std.4800" },
        { "B9600",      "std.9600" },
        { "B19200",     "std.19200" },
        { 0 }
};

char *
portselector(void)
{
        char c, baud[20], *type = "default";
        struct portselect *ps;
        size_t len;

        alarm(5*60);
        for (len = 0; len < sizeof (baud) - 1; len++) {
                if (read(STDIN_FILENO, &c, 1) <= 0)
                        break;
                c &= 0177;
                if (c == '\n' || c == '\r')
                        break;
                if (c == 'B')
                        len = 0;        /* in case of leading garbage */
                baud[len] = c;
        }
        baud[len] = '\0';
        for (ps = portspeeds; ps->ps_baud; ps++)
                if (strcmp(ps->ps_baud, baud) == 0) {
                        type = ps->ps_type;
                        break;
                }
        sleep(2);       /* wait for connection to complete */
        return (type);
}

/*
 * This auto-baud speed select mechanism is written for the Micom 600
 * portselector. Selection is done by looking at how the character '\r'
 * is garbled at the different speeds.
 */
#include <sys/time.h>

char *
autobaud(void)
{
        struct pollfd pfd[1];
        struct timespec ts;
        char c, *type = "9600-baud";

        (void)tcflush(0, TCIOFLUSH);
        pfd[0].fd = 0;
        pfd[0].events = POLLIN;
        if (poll(pfd, 1, 5 * 1000) <= 0)
                return (type);
        if (read(STDIN_FILENO, &c, sizeof(char)) != sizeof(char))
                return (type);

        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000;
        nanosleep(&ts, NULL);
        (void)tcflush(0, TCIOFLUSH);
        switch (c & 0377) {

        case 0200:              /* 300-baud */
                type = "300-baud";
                break;

        case 0346:              /* 1200-baud */
                type = "1200-baud";
                break;

        case  015:              /* 2400-baud */
        case 0215:
                type = "2400-baud";
                break;

        default:                /* 4800-baud */
                type = "4800-baud";
                break;

        case 0377:              /* 9600-baud */
                type = "9600-baud";
                break;
        }
        return (type);
}