xref: /dragonfly/libexec/getty/subr.c (revision 548a3528)
1 /*
2  * Copyright (c) 1983, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * @(#)from: subr.c	8.1 (Berkeley) 6/4/93
30  * $FreeBSD: src/libexec/getty/subr.c,v 1.16.2.1 2001/05/12 10:16:51 kris Exp $
31  */
32 
33 /*
34  * Melbourne getty.
35  */
36 #define COMPAT_43
37 #ifdef DEBUG
38 #include <stdio.h>
39 #endif
40 #include <stdlib.h>
41 #include <string.h>
42 #include <termios.h>
43 #include <unistd.h>
44 #include <sys/ioctl.h>
45 #include <sys/param.h>
46 #include <sys/time.h>
47 #include <syslog.h>
48 
49 #include "gettytab.h"
50 #include "pathnames.h"
51 #include "extern.h"
52 
53 
54 #ifdef COMPAT_43
55 static void	compatflags (long);
56 #endif
57 
58 /*
59  * Get a table entry.
60  */
61 void
62 gettable(const char *name, char *buf)
63 {
64 	struct gettystrs *sp;
65 	struct gettynums *np;
66 	struct gettyflags *fp;
67 	long n;
68 	int l;
69 	char *p;
70 	char *msg = NULL;
71 	const char *dba[2];
72 
73 	static int firsttime = 1;
74 
75 	dba[0] = _PATH_GETTYTAB;
76 	dba[1] = NULL;
77 
78 	if (firsttime) {
79 		/*
80 		 * we need to strdup() anything in the strings array
81 		 * initially in order to simplify things later
82 		 */
83 		for (sp = gettystrs; sp->field; sp++)
84 			if (sp->value != NULL) {
85 				/* handle these ones more carefully */
86 				if (sp >= &gettystrs[4] && sp <= &gettystrs[6])
87 					l = 2;
88 				else
89 					l = strlen(sp->value) + 1;
90 				if ((p = malloc(l)) != NULL) {
91 					strncpy(p, sp->value, l);
92 					p[l-1] = '\0';
93 				}
94 				/*
95 				 * replace, even if NULL, else we'll
96 				 * have problems with free()ing static mem
97 				 */
98 				sp->value = p;
99 			}
100 		firsttime = 0;
101 	}
102 
103 	switch (cgetent(&buf, (char **)dba, (char *)name)) {
104 	case 1:
105 		msg = "%s: couldn't resolve 'tc=' in gettytab '%s'";
106 	case 0:
107 		break;
108 	case -1:
109 		msg = "%s: unknown gettytab entry '%s'";
110 		break;
111 	case -2:
112 		msg = "%s: retrieving gettytab entry '%s': %m";
113 		break;
114 	case -3:
115 		msg = "%s: recursive 'tc=' reference gettytab entry '%s'";
116 		break;
117 	default:
118 		msg = "%s: unexpected cgetent() error for entry '%s'";
119 		break;
120 	}
121 
122 	if (msg != NULL) {
123 		syslog(LOG_ERR, msg, "getty", name);
124 		return;
125 	}
126 
127 	for (sp = gettystrs; sp->field; sp++) {
128 		if ((l = cgetstr(buf, (char*)sp->field, &p)) >= 0) {
129 			if (sp->value) {
130 				/* prefer existing value */
131 				if (strcmp(p, sp->value) != 0)
132 					free(sp->value);
133 				else {
134 					free(p);
135 					p = sp->value;
136 				}
137 			}
138 			sp->value = p;
139 		} else if (l == -1) {
140 			free(sp->value);
141 			sp->value = NULL;
142 		}
143 	}
144 
145 	for (np = gettynums; np->field; np++) {
146 		if (cgetnum(buf, (char*)np->field, &n) == -1)
147 			np->set = 0;
148 		else {
149 			np->set = 1;
150 			np->value = n;
151 		}
152 	}
153 
154 	for (fp = gettyflags; fp->field; fp++) {
155 		if (cgetcap(buf, (char *)fp->field, ':') == NULL)
156 			fp->set = 0;
157 		else {
158 			fp->set = 1;
159 			fp->value = 1 ^ fp->invrt;
160 		}
161 	}
162 
163 #ifdef DEBUG
164 	printf("name=\"%s\", buf=\"%s\"\r\n", name, buf);
165 	for (sp = gettystrs; sp->field; sp++)
166 		printf("cgetstr: %s=%s\r\n", sp->field, sp->value);
167 	for (np = gettynums; np->field; np++)
168 		printf("cgetnum: %s=%d\r\n", np->field, np->value);
169 	for (fp = gettyflags; fp->field; fp++)
170 		printf("cgetflags: %s='%c' set='%c'\r\n", fp->field,
171 		       fp->value + '0', fp->set + '0');
172 #endif /* DEBUG */
173 }
174 
175 void
176 gendefaults(void)
177 {
178 	struct gettystrs *sp;
179 	struct gettynums *np;
180 	struct gettyflags *fp;
181 
182 	for (sp = gettystrs; sp->field; sp++)
183 		if (sp->value)
184 			sp->defalt = strdup(sp->value);
185 	for (np = gettynums; np->field; np++)
186 		if (np->set)
187 			np->defalt = np->value;
188 	for (fp = gettyflags; fp->field; fp++)
189 		if (fp->set)
190 			fp->defalt = fp->value;
191 		else
192 			fp->defalt = fp->invrt;
193 }
194 
195 void
196 setdefaults(void)
197 {
198 	struct gettystrs *sp;
199 	struct gettynums *np;
200 	struct gettyflags *fp;
201 
202 	for (sp = gettystrs; sp->field; sp++)
203 		if (!sp->value)
204 			sp->value = !sp->defalt ? sp->defalt
205 						: strdup(sp->defalt);
206 	for (np = gettynums; np->field; np++)
207 		if (!np->set)
208 			np->value = np->defalt;
209 	for (fp = gettyflags; fp->field; fp++)
210 		if (!fp->set)
211 			fp->value = fp->defalt;
212 }
213 
214 static char **
215 charnames[] = {
216 	&ER, &KL, &IN, &QU, &XN, &XF, &ET, &BK,
217 	&SU, &DS, &RP, &FL, &WE, &LN, 0
218 };
219 
220 static char *
221 charvars[] = {
222 	&tmode.c_cc[VERASE], &tmode.c_cc[VKILL], &tmode.c_cc[VINTR],
223 	&tmode.c_cc[VQUIT], &tmode.c_cc[VSTART], &tmode.c_cc[VSTOP],
224 	&tmode.c_cc[VEOF], &tmode.c_cc[VEOL], &tmode.c_cc[VSUSP],
225 	&tmode.c_cc[VDSUSP], &tmode.c_cc[VREPRINT], &tmode.c_cc[VDISCARD],
226 	&tmode.c_cc[VWERASE], &tmode.c_cc[VLNEXT], 0
227 };
228 
229 void
230 setchars(void)
231 {
232 	int i;
233 	const char *p;
234 
235 	for (i = 0; charnames[i]; i++) {
236 		p = *charnames[i];
237 		if (p && *p)
238 			*charvars[i] = *p;
239 		else
240 			*charvars[i] = _POSIX_VDISABLE;
241 	}
242 }
243 
244 /* Macros to clear/set/test flags. */
245 #define	SET(t, f)	(t) |= (f)
246 #define	CLR(t, f)	(t) &= ~(f)
247 #define	ISSET(t, f)	((t) & (f))
248 
249 void
250 set_flags(int n)
251 {
252 	tcflag_t iflag, oflag, cflag, lflag;
253 
254 #ifdef COMPAT_43
255 	switch (n) {
256 	case 0:
257 		if (F0set) {
258 			compatflags(F0);
259 			return;
260 		}
261 		break;
262 	case 1:
263 		if (F1set) {
264 			compatflags(F1);
265 			return;
266 		}
267 		break;
268 	default:
269 		if (F2set) {
270 			compatflags(F2);
271 			return;
272 		}
273 		break;
274 	}
275 #endif
276 
277 	switch (n) {
278 	case 0:
279 		if (C0set && I0set && L0set && O0set) {
280 			tmode.c_cflag = C0;
281 			tmode.c_iflag = I0;
282 			tmode.c_lflag = L0;
283 			tmode.c_oflag = O0;
284 			return;
285 		}
286 		break;
287 	case 1:
288 		if (C1set && I1set && L1set && O1set) {
289 			tmode.c_cflag = C1;
290 			tmode.c_iflag = I1;
291 			tmode.c_lflag = L1;
292 			tmode.c_oflag = O1;
293 			return;
294 		}
295 		break;
296 	default:
297 		if (C2set && I2set && L2set && O2set) {
298 			tmode.c_cflag = C2;
299 			tmode.c_iflag = I2;
300 			tmode.c_lflag = L2;
301 			tmode.c_oflag = O2;
302 			return;
303 		}
304 		break;
305 	}
306 
307 	iflag = omode.c_iflag;
308 	oflag = omode.c_oflag;
309 	cflag = omode.c_cflag;
310 	lflag = omode.c_lflag;
311 
312 	if (NP) {
313 		CLR(cflag, CSIZE|PARENB);
314 		SET(cflag, CS8);
315 		CLR(iflag, ISTRIP|INPCK|IGNPAR);
316 	} else if (AP || EP || OP) {
317 		CLR(cflag, CSIZE);
318 		SET(cflag, CS7|PARENB);
319 		SET(iflag, ISTRIP);
320 		if (OP && !EP) {
321 			SET(iflag, INPCK|IGNPAR);
322 			SET(cflag, PARODD);
323 			if (AP)
324 				CLR(iflag, INPCK);
325 		} else if (EP && !OP) {
326 			SET(iflag, INPCK|IGNPAR);
327 			CLR(cflag, PARODD);
328 			if (AP)
329 				CLR(iflag, INPCK);
330 		} else if (AP || (EP && OP)) {
331 			CLR(iflag, INPCK|IGNPAR);
332 			CLR(cflag, PARODD);
333 		}
334 	} /* else, leave as is */
335 
336 #if 0
337 	if (UC)
338 		f |= LCASE;
339 #endif
340 
341 	if (HC)
342 		SET(cflag, HUPCL);
343 	else
344 		CLR(cflag, HUPCL);
345 
346 	if (MB)
347 		SET(cflag, MDMBUF);
348 	else
349 		CLR(cflag, MDMBUF);
350 
351 	if (HW)
352 		SET(cflag, CRTSCTS);
353 	else
354 		CLR(cflag, CRTSCTS);
355 
356 	if (NL) {
357 		SET(iflag, ICRNL);
358 		SET(oflag, ONLCR|OPOST);
359 	} else {
360 		CLR(iflag, ICRNL);
361 		CLR(oflag, ONLCR);
362 	}
363 
364 	if (!HT)
365 		SET(oflag, OXTABS|OPOST);
366 	else
367 		CLR(oflag, OXTABS);
368 
369 #ifdef XXX_DELAY
370 	SET(f, delaybits());
371 #endif
372 
373 	if (n == 1) {		/* read mode flags */
374 		if (RW) {
375 			iflag = 0;
376 			CLR(oflag, OPOST);
377 			CLR(cflag, CSIZE|PARENB);
378 			SET(cflag, CS8);
379 			lflag = 0;
380 		} else {
381 			CLR(lflag, ICANON);
382 		}
383 		goto out;
384 	}
385 
386 	if (n == 0)
387 		goto out;
388 
389 #if 0
390 	if (CB)
391 		SET(f, CRTBS);
392 #endif
393 
394 	if (CE)
395 		SET(lflag, ECHOE);
396 	else
397 		CLR(lflag, ECHOE);
398 
399 	if (CK)
400 		SET(lflag, ECHOKE);
401 	else
402 		CLR(lflag, ECHOKE);
403 
404 	if (PE)
405 		SET(lflag, ECHOPRT);
406 	else
407 		CLR(lflag, ECHOPRT);
408 
409 	if (EC)
410 		SET(lflag, ECHO);
411 	else
412 		CLR(lflag, ECHO);
413 
414 	if (XC)
415 		SET(lflag, ECHOCTL);
416 	else
417 		CLR(lflag, ECHOCTL);
418 
419 	if (DX)
420 		SET(lflag, IXANY);
421 	else
422 		CLR(lflag, IXANY);
423 
424 out:
425 	tmode.c_iflag = iflag;
426 	tmode.c_oflag = oflag;
427 	tmode.c_cflag = cflag;
428 	tmode.c_lflag = lflag;
429 }
430 
431 #ifdef COMPAT_43
432 /*
433  * Old TTY => termios, snatched from <sys/kern/tty_compat.c>
434  */
435 void
436 compatflags(long flags)
437 {
438 	tcflag_t iflag, oflag, cflag, lflag;
439 
440 	iflag = BRKINT|ICRNL|IMAXBEL|IXON|IXANY;
441 	oflag = OPOST|ONLCR|OXTABS;
442 	cflag = CREAD;
443 	lflag = ICANON|ISIG|IEXTEN;
444 
445 	if (ISSET(flags, TANDEM))
446 		SET(iflag, IXOFF);
447 	else
448 		CLR(iflag, IXOFF);
449 	if (ISSET(flags, ECHO))
450 		SET(lflag, ECHO);
451 	else
452 		CLR(lflag, ECHO);
453 	if (ISSET(flags, CRMOD)) {
454 		SET(iflag, ICRNL);
455 		SET(oflag, ONLCR);
456 	} else {
457 		CLR(iflag, ICRNL);
458 		CLR(oflag, ONLCR);
459 	}
460 	if (ISSET(flags, XTABS))
461 		SET(oflag, OXTABS);
462 	else
463 		CLR(oflag, OXTABS);
464 
465 
466 	if (ISSET(flags, RAW)) {
467 		iflag &= IXOFF;
468 		CLR(lflag, ISIG|ICANON|IEXTEN);
469 		CLR(cflag, PARENB);
470 	} else {
471 		SET(iflag, BRKINT|IXON|IMAXBEL);
472 		SET(lflag, ISIG|IEXTEN);
473 		if (ISSET(flags, CBREAK))
474 			CLR(lflag, ICANON);
475 		else
476 			SET(lflag, ICANON);
477 		switch (ISSET(flags, ANYP)) {
478 		case 0:
479 			CLR(cflag, PARENB);
480 			break;
481 		case ANYP:
482 			SET(cflag, PARENB);
483 			CLR(iflag, INPCK);
484 			break;
485 		case EVENP:
486 			SET(cflag, PARENB);
487 			SET(iflag, INPCK);
488 			CLR(cflag, PARODD);
489 			break;
490 		case ODDP:
491 			SET(cflag, PARENB);
492 			SET(iflag, INPCK);
493 			SET(cflag, PARODD);
494 			break;
495 		}
496 	}
497 
498 	/* Nothing we can do with CRTBS. */
499 	if (ISSET(flags, PRTERA))
500 		SET(lflag, ECHOPRT);
501 	else
502 		CLR(lflag, ECHOPRT);
503 	if (ISSET(flags, CRTERA))
504 		SET(lflag, ECHOE);
505 	else
506 		CLR(lflag, ECHOE);
507 	/* Nothing we can do with TILDE. */
508 	if (ISSET(flags, MDMBUF))
509 		SET(cflag, MDMBUF);
510 	else
511 		CLR(cflag, MDMBUF);
512 	if (ISSET(flags, NOHANG))
513 		CLR(cflag, HUPCL);
514 	else
515 		SET(cflag, HUPCL);
516 	if (ISSET(flags, CRTKIL))
517 		SET(lflag, ECHOKE);
518 	else
519 		CLR(lflag, ECHOKE);
520 	if (ISSET(flags, CTLECH))
521 		SET(lflag, ECHOCTL);
522 	else
523 		CLR(lflag, ECHOCTL);
524 	if (!ISSET(flags, DECCTQ))
525 		SET(iflag, IXANY);
526 	else
527 		CLR(iflag, IXANY);
528 	CLR(lflag, TOSTOP|FLUSHO|PENDIN|NOFLSH);
529 	SET(lflag, ISSET(flags, TOSTOP|FLUSHO|PENDIN|NOFLSH));
530 
531 	if (ISSET(flags, RAW|LITOUT|PASS8)) {
532 		CLR(cflag, CSIZE);
533 		SET(cflag, CS8);
534 		if (!ISSET(flags, RAW|PASS8))
535 			SET(iflag, ISTRIP);
536 		else
537 			CLR(iflag, ISTRIP);
538 		if (!ISSET(flags, RAW|LITOUT))
539 			SET(oflag, OPOST);
540 		else
541 			CLR(oflag, OPOST);
542 	} else {
543 		CLR(cflag, CSIZE);
544 		SET(cflag, CS7);
545 		SET(iflag, ISTRIP);
546 		SET(oflag, OPOST);
547 	}
548 
549 	tmode.c_iflag = iflag;
550 	tmode.c_oflag = oflag;
551 	tmode.c_cflag = cflag;
552 	tmode.c_lflag = lflag;
553 }
554 #endif
555 
556 #ifdef XXX_DELAY
557 struct delayval {
558 	unsigned	delay;		/* delay in ms */
559 	int		bits;
560 };
561 
562 /*
563  * below are random guesses, I can't be bothered checking
564  */
565 
566 struct delayval	crdelay[] = {
567 	{ 1,		CR1 },
568 	{ 2,		CR2 },
569 	{ 3,		CR3 },
570 	{ 83,		CR1 },
571 	{ 166,		CR2 },
572 	{ 0,		CR3 },
573 };
574 
575 struct delayval nldelay[] = {
576 	{ 1,		NL1 },		/* special, calculated */
577 	{ 2,		NL2 },
578 	{ 3,		NL3 },
579 	{ 100,		NL2 },
580 	{ 0,		NL3 },
581 };
582 
583 struct delayval	bsdelay[] = {
584 	{ 1,		BS1 },
585 	{ 0,		0 },
586 };
587 
588 struct delayval	ffdelay[] = {
589 	{ 1,		FF1 },
590 	{ 1750,		FF1 },
591 	{ 0,		FF1 },
592 };
593 
594 struct delayval	tbdelay[] = {
595 	{ 1,		TAB1 },
596 	{ 2,		TAB2 },
597 	{ 3,		XTABS },	/* this is expand tabs */
598 	{ 100,		TAB1 },
599 	{ 0,		TAB2 },
600 };
601 
602 int
603 delaybits(void)
604 {
605 	int f;
606 
607 	f  = adelay(CD, crdelay);
608 	f |= adelay(ND, nldelay);
609 	f |= adelay(FD, ffdelay);
610 	f |= adelay(TD, tbdelay);
611 	f |= adelay(BD, bsdelay);
612 	return (f);
613 }
614 
615 int
616 adelay(int ms, struct delayval *dp)
617 {
618 	if (ms == 0)
619 		return (0);
620 	while (dp->delay && ms > dp->delay)
621 		dp++;
622 	return (dp->bits);
623 }
624 #endif
625 
626 char	editedhost[MAXHOSTNAMELEN];
627 
628 void
629 edithost(const char *pat)
630 {
631 	const char *host = HN;
632 	char *res = editedhost;
633 
634 	if (!pat)
635 		pat = "";
636 	while (*pat) {
637 		switch (*pat) {
638 
639 		case '#':
640 			if (*host)
641 				host++;
642 			break;
643 
644 		case '@':
645 			if (*host)
646 				*res++ = *host++;
647 			break;
648 
649 		default:
650 			*res++ = *pat;
651 			break;
652 
653 		}
654 		if (res == &editedhost[sizeof editedhost - 1]) {
655 			*res = '\0';
656 			return;
657 		}
658 		pat++;
659 	}
660 	if (*host)
661 		strncpy(res, host, sizeof editedhost - (res - editedhost) - 1);
662 	else
663 		*res = '\0';
664 	editedhost[sizeof editedhost - 1] = '\0';
665 }
666 
667 static struct speedtab {
668 	int	speed;
669 	int	uxname;
670 } speedtab[] = {
671 	{ 50,	B50 },
672 	{ 75,	B75 },
673 	{ 110,	B110 },
674 	{ 134,	B134 },
675 	{ 150,	B150 },
676 	{ 200,	B200 },
677 	{ 300,	B300 },
678 	{ 600,	B600 },
679 	{ 1200,	B1200 },
680 	{ 1800,	B1800 },
681 	{ 2400,	B2400 },
682 	{ 4800,	B4800 },
683 	{ 9600,	B9600 },
684 	{ 19200, EXTA },
685 	{ 19,	EXTA },		/* for people who say 19.2K */
686 	{ 38400, EXTB },
687 	{ 38,	EXTB },
688 	{ 7200,	EXTB },		/* alternative */
689 	{ 57600, B57600 },
690 	{ 115200, B115200 },
691 	{ 230400, B230400 },
692 	{ 0 }
693 };
694 
695 int
696 speed(int val)
697 {
698 	struct speedtab *sp;
699 
700 	if (val <= B230400)
701 		return (val);
702 
703 	for (sp = speedtab; sp->speed; sp++)
704 		if (sp->speed == val)
705 			return (sp->uxname);
706 
707 	return (B300);		/* default in impossible cases */
708 }
709 
710 void
711 makeenv(char *env[])
712 {
713 	static char termbuf[128] = "TERM=";
714 	char *p, *q;
715 	char **ep;
716 
717 	ep = env;
718 	if (TT && *TT) {
719 		strlcat(termbuf, TT, sizeof(termbuf));
720 		*ep++ = termbuf;
721 	}
722 	if ((p = EV)) {
723 		q = p;
724 		while ((q = strchr(q, ','))) {
725 			*q++ = '\0';
726 			*ep++ = p;
727 			p = q;
728 		}
729 		if (*p)
730 			*ep++ = p;
731 	}
732 	*ep = NULL;
733 }
734 
735 /*
736  * This speed select mechanism is written for the Develcon DATASWITCH.
737  * The Develcon sends a string of the form "B{speed}\n" at a predefined
738  * baud rate. This string indicates the user's actual speed.
739  * The routine below returns the terminal type mapped from derived speed.
740  */
741 struct	portselect {
742 	const char	*ps_baud;
743 	const char	*ps_type;
744 } portspeeds[] = {
745 	{ "B110",	"std.110" },
746 	{ "B134",	"std.134" },
747 	{ "B150",	"std.150" },
748 	{ "B300",	"std.300" },
749 	{ "B600",	"std.600" },
750 	{ "B1200",	"std.1200" },
751 	{ "B2400",	"std.2400" },
752 	{ "B4800",	"std.4800" },
753 	{ "B9600",	"std.9600" },
754 	{ "B19200",	"std.19200" },
755 	{ 0 }
756 };
757 
758 const char *
759 portselector(void)
760 {
761 	char c, baud[20];
762 	const char *type = "default";
763 	struct portselect *ps;
764 	int len;
765 
766 	alarm(5*60);
767 	for (len = 0; len < sizeof (baud) - 1; len++) {
768 		if (read(STDIN_FILENO, &c, 1) <= 0)
769 			break;
770 		c &= 0177;
771 		if (c == '\n' || c == '\r')
772 			break;
773 		if (c == 'B')
774 			len = 0;	/* in case of leading garbage */
775 		baud[len] = c;
776 	}
777 	baud[len] = '\0';
778 	for (ps = portspeeds; ps->ps_baud; ps++)
779 		if (strcmp(ps->ps_baud, baud) == 0) {
780 			type = ps->ps_type;
781 			break;
782 		}
783 	sleep(2);	/* wait for connection to complete */
784 	return (type);
785 }
786 
787 /*
788  * This auto-baud speed select mechanism is written for the Micom 600
789  * portselector. Selection is done by looking at how the character '\r'
790  * is garbled at the different speeds.
791  */
792 const char *
793 autobaud(void)
794 {
795 	int rfds;
796 	struct timeval timeout;
797 	char c;
798 	const char *type = "9600-baud";
799 
800 	(void)tcflush(0, TCIOFLUSH);
801 	rfds = 1 << 0;
802 	timeout.tv_sec = 5;
803 	timeout.tv_usec = 0;
804 	if (select(32, (fd_set *)&rfds, NULL, NULL, &timeout) <= 0)
805 		return (type);
806 	if (read(STDIN_FILENO, &c, sizeof(char)) != sizeof(char))
807 		return (type);
808 	timeout.tv_sec = 0;
809 	timeout.tv_usec = 20;
810 	(void) select(32, NULL, NULL, NULL, &timeout);
811 	(void)tcflush(0, TCIOFLUSH);
812 	switch (c & 0377) {
813 
814 	case 0200:		/* 300-baud */
815 		type = "300-baud";
816 		break;
817 
818 	case 0346:		/* 1200-baud */
819 		type = "1200-baud";
820 		break;
821 
822 	case  015:		/* 2400-baud */
823 	case 0215:
824 		type = "2400-baud";
825 		break;
826 
827 	default:		/* 4800-baud */
828 		type = "4800-baud";
829 		break;
830 
831 	case 0377:		/* 9600-baud */
832 		type = "9600-baud";
833 		break;
834 	}
835 	return (type);
836 }
837