/*      $NetBSD: subr.c,v 1.35 2013/08/11 16:36:30 dholland 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.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "from: @(#)subr.c        8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: subr.c,v 1.35 2013/08/11 16:36:30 dholland Exp $");
#endif
#endif /* not lint */

/*
 * Melbourne getty.
 */
#define COMPAT_43
#include <sys/param.h>
#include <sys/ioctl.h>

#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <poll.h>
#include <util.h>

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

extern  struct termios tmode, omode;

static void     compatflags(long);

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

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

        for (sp = gettystrs; sp->field; sp++)
                (void)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 ? estrdup(sp->defalt) : NULL;
        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, &ST, &B2, 0
};

static cc_t *
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], &tmode.c_cc[VSTATUS],
        &tmode.c_cc[VEOL2], 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;

#ifdef COMPAT_43
        switch (n) {
        case 0:
                if (F0set) {
                        compatflags(F0);
                        return;
                }
                break;
        case 1:
                if (F1set) {
                        compatflags(F1);
                        return;
                }
                break;
        default:
                if (F2set) {
                        compatflags(F2);
                        return;
                }
                break;
        }
#endif

        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 0
        if (UC)
                f |= LCASE;
#endif

        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);

#ifdef XXX_DELAY
        SET(f, delaybits());
#endif

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

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

#ifdef COMPAT_43
/*
 * Old TTY => termios, snatched from <sys/kern/tty_compat.c>
 */
void
compatflags(long flags)
{
        tcflag_t iflag, oflag, cflag, lflag;

        iflag = BRKINT|ICRNL|IMAXBEL|IXON|IXANY;
        oflag = OPOST|ONLCR|OXTABS;
        cflag = CREAD;
        lflag = ICANON|ISIG|IEXTEN;

        if (ISSET(flags, TANDEM))
                SET(iflag, IXOFF);
        else
                CLR(iflag, IXOFF);
        if (ISSET(flags, ECHO))
                SET(lflag, ECHO);
        else
                CLR(lflag, ECHO);
        if (ISSET(flags, CRMOD)) {
                SET(iflag, ICRNL);
                SET(oflag, ONLCR);
        } else {
                CLR(iflag, ICRNL);
                CLR(oflag, ONLCR);
        }
        if (ISSET(flags, XTABS))
                SET(oflag, OXTABS);
        else
                CLR(oflag, OXTABS);


        if (ISSET(flags, RAW)) {
                iflag &= IXOFF;
                CLR(lflag, ISIG|ICANON|IEXTEN);
                CLR(cflag, PARENB);
        } else {
                SET(iflag, BRKINT|IXON|IMAXBEL);
                SET(lflag, ISIG|IEXTEN);
                if (ISSET(flags, CBREAK))
                        CLR(lflag, ICANON);
                else
                        SET(lflag, ICANON);
                switch (ISSET(flags, ANYP)) {
                case 0:
                        CLR(cflag, PARENB);
                        break;
                case ANYP:
                        SET(cflag, PARENB);
                        CLR(iflag, INPCK);
                        break;
                case EVENP:
                        SET(cflag, PARENB);
                        SET(iflag, INPCK);
                        CLR(cflag, PARODD);
                        break;
                case ODDP:
                        SET(cflag, PARENB);
                        SET(iflag, INPCK);
                        SET(cflag, PARODD);
                        break;
                }
        }

        /* Nothing we can do with CRTBS. */
        if (ISSET(flags, PRTERA))
                SET(lflag, ECHOPRT);
        else
                CLR(lflag, ECHOPRT);
        if (ISSET(flags, CRTERA))
                SET(lflag, ECHOE);
        else
                CLR(lflag, ECHOE);
        /* Nothing we can do with TILDE. */
        if (ISSET(flags, MDMBUF))
                SET(cflag, MDMBUF);
        else
                CLR(cflag, MDMBUF);
        if (ISSET(flags, NOHANG))
                CLR(cflag, HUPCL);
        else
                SET(cflag, HUPCL);
        if (ISSET(flags, CRTKIL))
                SET(lflag, ECHOKE);
        else
                CLR(lflag, ECHOKE);
        if (ISSET(flags, CTLECH))
                SET(lflag, ECHOCTL);
        else
                CLR(lflag, ECHOCTL);
        if (!ISSET(flags, DECCTQ))
                SET(iflag, IXANY);
        else
                CLR(iflag, IXANY);
        CLR(lflag, TOSTOP|FLUSHO|PENDIN|NOFLSH);
        SET(lflag, ISSET(flags, TOSTOP|FLUSHO|PENDIN|NOFLSH));

        if (ISSET(flags, RAW|LITOUT|PASS8)) {
                CLR(cflag, CSIZE);
                SET(cflag, CS8);
                if (!ISSET(flags, RAW|PASS8))
                        SET(iflag, ISTRIP);
                else
                        CLR(iflag, ISTRIP);
                if (!ISSET(flags, RAW|LITOUT))
                        SET(oflag, OPOST);
                else
                        CLR(oflag, OPOST);
        } else {
                CLR(cflag, CSIZE);
                SET(cflag, CS7);
                SET(iflag, ISTRIP);
                SET(oflag, OPOST);
        }

        tmode.c_iflag = iflag;
        tmode.c_oflag = oflag;
        tmode.c_cflag = cflag;
        tmode.c_lflag = lflag;
}
#endif

#ifdef XXX_DELAY
struct delayval {
        unsigned        delay;          /* delay in ms */
        int             bits;
};

/*
 * below are random guesses, I can't be bothered checking
 */

struct delayval crdelay[] = {
        { 1,            CR1 },
        { 2,            CR2 },
        { 3,            CR3 },
        { 83,           CR1 },
        { 166,          CR2 },
        { 0,            CR3 },
};

struct delayval nldelay[] = {
        { 1,            NL1 },          /* special, calculated */
        { 2,            NL2 },
        { 3,            NL3 },
        { 100,          NL2 },
        { 0,            NL3 },
};

struct delayval bsdelay[] = {
        { 1,            BS1 },
        { 0,            0 },
};

struct delayval ffdelay[] = {
        { 1,            FF1 },
        { 1750,         FF1 },
        { 0,            FF1 },
};

struct delayval tbdelay[] = {
        { 1,             TAB1 },
        { 2,             TAB2 },
        { 3,            XTABS },        /* this is expand tabs */
        { 100,           TAB1 },
        { 0,             TAB2 },
};

int
delaybits(void)
{
        int f;

        f  = adelay(CD, crdelay);
        f |= adelay(ND, nldelay);
        f |= adelay(FD, ffdelay);
        f |= adelay(TD, tbdelay);
        f |= adelay(BD, bsdelay);
        return (f);
}

int
adelay(int ms, struct delayval *dp)
{
        if (ms == 0)
                return (0);
        while (dp->delay && ms > dp->delay)
                dp++;
        return (dp->bits);
}
#endif

char    editedhost[MAXHOSTNAMELEN];

void
edithost(const char *pat)
{
        char *host = HN;
        char *res = editedhost;

        if (!pat)
                pat = "";
        while (*pat) {
                switch (*pat) {

                case '#':
                        if (*host)
                                host++;
                        break;

                case '@':
                        if (*host)
                                *res++ = *host++;
                        break;

                default:
                        *res++ = *pat;
                        break;

                }
                if (res == &editedhost[sizeof editedhost - 1]) {
                        *res = '\0';
                        return;
                }
                pat++;
        }
        if (*host)
                (void)strncpy(res, host,
                    sizeof editedhost - (res - editedhost) - 1);
        else
                *res = '\0';
        editedhost[sizeof editedhost - 1] = '\0';
}

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

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

/*
 * 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 {
        const char *ps_baud;
        const 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" },
        { NULL, NULL }
};

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

        (void)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;
                }
        (void)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>

const char *
autobaud(void)
{
        struct pollfd set[1];
        struct timespec timeout;
        char c;
        const char *type = "9600-baud";

        (void)tcflush(0, TCIOFLUSH);
        set[0].fd = STDIN_FILENO;
        set[0].events = POLLIN;
        if (poll(set, 1, 5000) <= 0)
                return (type);
        if (read(STDIN_FILENO, &c, 1) != 1)
                return (type);
        timeout.tv_sec = 0;
        timeout.tv_nsec = 20000;
        (void)nanosleep(&timeout, 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);
}