1/*	$OpenBSD: subr.c,v 1.28 2018/06/14 23:19:27 gsoares Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32/*
33 * Melbourne getty.
34 */
35#include <sys/ioctl.h>
36#include <stdlib.h>
37#include <unistd.h>
38#include <string.h>
39#include <poll.h>
40#include <termios.h>
41
42#include "gettytab.h"
43#include "pathnames.h"
44#include "extern.h"
45
46extern	struct termios tmode, omode;
47
48/*
49 * Get a table entry.
50 */
51void
52gettable(char *name, char *buf)
53{
54	struct gettystrs *sp;
55	struct gettynums *np;
56	struct gettyflags *fp;
57	long n;
58	char *dba[2];
59	dba[0] = _PATH_GETTYTAB;
60	dba[1] = NULL;
61
62	if (cgetent(&buf, dba, name) != 0)
63		return;
64
65	for (sp = gettystrs; sp->field; sp++)
66		cgetstr(buf, sp->field, &sp->value);
67	for (np = gettynums; np->field; np++) {
68		if (cgetnum(buf, np->field, &n) == -1)
69			np->set = 0;
70		else {
71			np->set = 1;
72			np->value = n;
73		}
74	}
75	for (fp = gettyflags; fp->field; fp++) {
76		if (cgetcap(buf, fp->field, ':') == NULL)
77			fp->set = 0;
78		else {
79			fp->set = 1;
80			fp->value = 1 ^ fp->invrt;
81		}
82	}
83#ifdef DEBUG
84	printf("name=\"%s\", buf=\"%s\"\n", name, buf);
85	for (sp = gettystrs; sp->field; sp++)
86		printf("cgetstr: %s=%s\n", sp->field, sp->value);
87	for (np = gettynums; np->field; np++)
88		printf("cgetnum: %s=%d\n", np->field, np->value);
89	for (fp = gettyflags; fp->field; fp++)
90		printf("cgetflags: %s='%c' set='%c'\n", fp->field,
91		    fp->value + '0', fp->set + '0');
92	exit(1);
93#endif /* DEBUG */
94}
95
96void
97gendefaults(void)
98{
99	struct gettystrs *sp;
100	struct gettynums *np;
101	struct gettyflags *fp;
102
103	for (sp = gettystrs; sp->field; sp++)
104		if (sp->value)
105			sp->defalt = sp->value;
106	for (np = gettynums; np->field; np++)
107		if (np->set)
108			np->defalt = np->value;
109	for (fp = gettyflags; fp->field; fp++)
110		if (fp->set)
111			fp->defalt = fp->value;
112		else
113			fp->defalt = fp->invrt;
114}
115
116void
117setdefaults(void)
118{
119	struct gettystrs *sp;
120	struct gettynums *np;
121	struct gettyflags *fp;
122
123	for (sp = gettystrs; sp->field; sp++)
124		if (!sp->value)
125			sp->value = sp->defalt;
126	for (np = gettynums; np->field; np++)
127		if (!np->set)
128			np->value = np->defalt;
129	for (fp = gettyflags; fp->field; fp++)
130		if (!fp->set)
131			fp->value = fp->defalt;
132}
133
134static char **
135charnames[] = {
136	&ER, &KL, &IN, &QU, &XN, &XF, &ET, &BK,
137	&SU, &DS, &RP, &FL, &WE, &LN, 0
138};
139
140static char *
141charvars[] = {
142	&tmode.c_cc[VERASE], &tmode.c_cc[VKILL], &tmode.c_cc[VINTR],
143	&tmode.c_cc[VQUIT], &tmode.c_cc[VSTART], &tmode.c_cc[VSTOP],
144	&tmode.c_cc[VEOF], &tmode.c_cc[VEOL], &tmode.c_cc[VSUSP],
145	&tmode.c_cc[VDSUSP], &tmode.c_cc[VREPRINT], &tmode.c_cc[VDISCARD],
146	&tmode.c_cc[VWERASE], &tmode.c_cc[VLNEXT], 0
147};
148
149void
150setchars(void)
151{
152	int i;
153	char *p;
154
155	for (i = 0; charnames[i]; i++) {
156		p = *charnames[i];
157		if (p && *p)
158			*charvars[i] = *p;
159		else
160			*charvars[i] = _POSIX_VDISABLE;
161	}
162}
163
164/* Macros to clear/set/test flags. */
165#define	SET(t, f)	(t) |= (f)
166#define	CLR(t, f)	(t) &= ~(f)
167#define	ISSET(t, f)	((t) & (f))
168
169void
170setflags(int n)
171{
172	tcflag_t iflag, oflag, cflag, lflag;
173
174	switch (n) {
175	case 0:
176		if (C0set && I0set && L0set && O0set) {
177			tmode.c_cflag = C0;
178			tmode.c_iflag = I0;
179			tmode.c_lflag = L0;
180			tmode.c_oflag = O0;
181			return;
182		}
183		break;
184	case 1:
185		if (C1set && I1set && L1set && O1set) {
186			tmode.c_cflag = C1;
187			tmode.c_iflag = I1;
188			tmode.c_lflag = L1;
189			tmode.c_oflag = O1;
190			return;
191		}
192		break;
193	default:
194		if (C2set && I2set && L2set && O2set) {
195			tmode.c_cflag = C2;
196			tmode.c_iflag = I2;
197			tmode.c_lflag = L2;
198			tmode.c_oflag = O2;
199			return;
200		}
201		break;
202	}
203
204	iflag = omode.c_iflag;
205	oflag = omode.c_oflag;
206	cflag = omode.c_cflag;
207	lflag = omode.c_lflag;
208
209	if (NP) {
210		CLR(cflag, CSIZE|PARENB);
211		SET(cflag, CS8);
212		CLR(iflag, ISTRIP|INPCK|IGNPAR);
213	} else if (AP || EP || OP) {
214		CLR(cflag, CSIZE);
215		SET(cflag, CS7|PARENB);
216		SET(iflag, ISTRIP);
217		if (OP && !EP) {
218			SET(iflag, INPCK|IGNPAR);
219			SET(cflag, PARODD);
220			if (AP)
221				CLR(iflag, INPCK);
222		} else if (EP && !OP) {
223			SET(iflag, INPCK|IGNPAR);
224			CLR(cflag, PARODD);
225			if (AP)
226				CLR(iflag, INPCK);
227		} else if (AP || (EP && OP)) {
228			CLR(iflag, INPCK|IGNPAR);
229			CLR(cflag, PARODD);
230		}
231	} /* else, leave as is */
232
233	if (UC) {
234		SET(iflag, IUCLC);
235		SET(oflag, OLCUC);
236		SET(lflag, XCASE);
237	}
238
239	if (HC)
240		SET(cflag, HUPCL);
241	else
242		CLR(cflag, HUPCL);
243
244	if (MB)
245		SET(cflag, MDMBUF);
246	else
247		CLR(cflag, MDMBUF);
248
249	if (NL) {
250		SET(iflag, ICRNL);
251		SET(oflag, ONLCR|OPOST);
252	} else {
253		CLR(iflag, ICRNL);
254		CLR(oflag, ONLCR);
255	}
256
257	if (!HT)
258		SET(oflag, OXTABS|OPOST);
259	else
260		CLR(oflag, OXTABS);
261
262
263	if (n == 1) {		/* read mode flags */
264		if (RW) {
265			iflag = 0;
266			CLR(oflag, OPOST);
267			CLR(cflag, CSIZE|PARENB);
268			SET(cflag, CS8);
269			lflag = 0;
270		} else {
271			CLR(lflag, ICANON);
272		}
273		goto out;
274	}
275
276	if (n == 0)
277		goto out;
278
279#if 0
280	if (CB)
281		SET(f, CRTBS);
282#endif
283
284	if (CE)
285		SET(lflag, ECHOE);
286	else
287		CLR(lflag, ECHOE);
288
289	if (CK)
290		SET(lflag, ECHOKE);
291	else
292		CLR(lflag, ECHOKE);
293
294	if (PE)
295		SET(lflag, ECHOPRT);
296	else
297		CLR(lflag, ECHOPRT);
298
299	if (EC)
300		SET(lflag, ECHO);
301	else
302		CLR(lflag, ECHO);
303
304	if (XC)
305		SET(lflag, ECHOCTL);
306	else
307		CLR(lflag, ECHOCTL);
308
309	if (DX)
310		SET(lflag, IXANY);
311	else
312		CLR(lflag, IXANY);
313
314out:
315	tmode.c_iflag = iflag;
316	tmode.c_oflag = oflag;
317	tmode.c_cflag = cflag;
318	tmode.c_lflag = lflag;
319}
320
321
322void
323makeenv(char *env[])
324{
325	static char termbuf[128] = "TERM=";
326	char *p, *q;
327	char **ep;
328
329	ep = env;
330	if (TT && *TT) {
331		strlcat(termbuf, TT, sizeof(termbuf));
332		*ep++ = termbuf;
333	}
334	if ((p = EV)) {
335		q = p;
336		while ((q = strchr(q, ','))) {
337			*q++ = '\0';
338			*ep++ = p;
339			p = q;
340		}
341		if (*p)
342			*ep++ = p;
343	}
344	*ep = NULL;
345}
346
347/*
348 * This speed select mechanism is written for the Develcon DATASWITCH.
349 * The Develcon sends a string of the form "B{speed}\n" at a predefined
350 * baud rate. This string indicates the user's actual speed.
351 * The routine below returns the terminal type mapped from derived speed.
352 */
353struct	portselect {
354	char	*ps_baud;
355	char	*ps_type;
356} portspeeds[] = {
357	{ "B110",	"std.110" },
358	{ "B134",	"std.134" },
359	{ "B150",	"std.150" },
360	{ "B300",	"std.300" },
361	{ "B600",	"std.600" },
362	{ "B1200",	"std.1200" },
363	{ "B2400",	"std.2400" },
364	{ "B4800",	"std.4800" },
365	{ "B9600",	"std.9600" },
366	{ "B19200",	"std.19200" },
367	{ 0 }
368};
369
370char *
371portselector(void)
372{
373	char c, baud[20], *type = "default";
374	struct portselect *ps;
375	size_t len;
376
377	alarm(5*60);
378	for (len = 0; len < sizeof (baud) - 1; len++) {
379		if (read(STDIN_FILENO, &c, 1) <= 0)
380			break;
381		c &= 0177;
382		if (c == '\n' || c == '\r')
383			break;
384		if (c == 'B')
385			len = 0;	/* in case of leading garbage */
386		baud[len] = c;
387	}
388	baud[len] = '\0';
389	for (ps = portspeeds; ps->ps_baud; ps++)
390		if (strcmp(ps->ps_baud, baud) == 0) {
391			type = ps->ps_type;
392			break;
393		}
394	sleep(2);	/* wait for connection to complete */
395	return (type);
396}
397
398/*
399 * This auto-baud speed select mechanism is written for the Micom 600
400 * portselector. Selection is done by looking at how the character '\r'
401 * is garbled at the different speeds.
402 */
403#include <sys/time.h>
404
405char *
406autobaud(void)
407{
408	struct pollfd pfd[1];
409	struct timespec ts;
410	char c, *type = "9600-baud";
411
412	(void)tcflush(0, TCIOFLUSH);
413	pfd[0].fd = 0;
414	pfd[0].events = POLLIN;
415	if (poll(pfd, 1, 5 * 1000) <= 0)
416		return (type);
417	if (read(STDIN_FILENO, &c, sizeof(char)) != sizeof(char))
418		return (type);
419
420	ts.tv_sec = 0;
421	ts.tv_nsec = 20 * 1000;
422	nanosleep(&ts, NULL);
423	(void)tcflush(0, TCIOFLUSH);
424	switch (c & 0377) {
425
426	case 0200:		/* 300-baud */
427		type = "300-baud";
428		break;
429
430	case 0346:		/* 1200-baud */
431		type = "1200-baud";
432		break;
433
434	case  015:		/* 2400-baud */
435	case 0215:
436		type = "2400-baud";
437		break;
438
439	default:		/* 4800-baud */
440		type = "4800-baud";
441		break;
442
443	case 0377:		/* 9600-baud */
444		type = "9600-baud";
445		break;
446	}
447	return (type);
448}
449