xref: /openbsd-src/libexec/getty/subr.c (revision 667e8970ce31662bcc1100d75e7064997a1e078a)

/*	$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);
}