tty.c revision 1.8 
1/*	$OpenBSD: tty.c,v 1.8 1997/07/30 06:32:41 millert Exp $	*/
2/*	$NetBSD: tty.c,v 1.7 1997/07/09 05:25:46 mikel Exp $	*/
3
4/*
5 * Copyright (c) 1980, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38#if 0
39static char sccsid[] = "@(#)tty.c	8.2 (Berkeley) 4/20/95";
40#else
41static char rcsid[] = "$OpenBSD: tty.c,v 1.8 1997/07/30 06:32:41 millert Exp $";
42#endif
43#endif /* not lint */
44
45/*
46 * Mail -- a mail program
47 *
48 * Generally useful tty stuff.
49 */
50
51#include "rcv.h"
52#include "extern.h"
53#include <sys/ioctl.h>
54
55static	cc_t		c_erase;	/* Current erase char */
56static	cc_t		c_kill;		/* Current kill char */
57static	sigjmp_buf	rewrite;	/* Place to go when continued */
58static	sigjmp_buf	intjmp;		/* Place to go when interrupted */
59#ifndef TIOCSTI
60static	int		ttyset;		/* We must now do erase/kill */
61#endif
62
63/*
64 * Read all relevant header fields.
65 */
66
67int
68grabh(hp, gflags)
69	struct header *hp;
70	int gflags;
71{
72	struct termios ttybuf;
73	sig_t saveint;
74#ifndef TIOCSTI
75	sig_t savequit;
76#else
77	int extproc, flag;
78#endif
79	sig_t savetstp;
80	sig_t savettou;
81	sig_t savettin;
82	int errs = 0;
83#ifdef __GNUC__
84	/* Avoid siglongjmp clobbering */
85#ifdef TIOCSTI
86	(void)&extproc;
87#endif
88	(void)&saveint;
89	(void)&errs;
90#endif
91
92	savetstp = signal(SIGTSTP, SIG_DFL);
93	savettou = signal(SIGTTOU, SIG_DFL);
94	savettin = signal(SIGTTIN, SIG_DFL);
95	errs = 0;
96#ifndef TIOCSTI
97	ttyset = 0;
98#endif
99	if (tcgetattr(fileno(stdin), &ttybuf) < 0) {
100		warn("tcgetattr");
101		return(-1);
102	}
103	c_erase = ttybuf.c_cc[VERASE];
104	c_kill = ttybuf.c_cc[VKILL];
105#ifndef TIOCSTI
106	ttybuf.c_cc[VERASE] = 0;
107	ttybuf.c_cc[VKILL] = 0;
108	if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL)
109		(void)signal(SIGINT, SIG_DFL);
110	if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL)
111		(void)signal(SIGQUIT, SIG_DFL);
112#else
113# ifdef	TIOCEXT
114	extproc = ((ttybuf.c_lflag & EXTPROC) ? 1 : 0);
115	if (extproc) {
116		flag = 0;
117		if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0)
118			warn("TIOCEXT: off");
119	}
120# endif	/* TIOCEXT */
121	if (sigsetjmp(intjmp, 1)) {
122		errs = SIGINT;
123		goto out;
124	}
125	saveint = signal(SIGINT, ttyint);
126#endif
127	if (gflags & GTO) {
128#ifndef TIOCSTI
129		if (!ttyset && hp->h_to != NIL)
130			ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
131#endif
132		hp->h_to =
133			extract(readtty("To: ", detract(hp->h_to, 0)), GTO);
134	}
135	if (gflags & GSUBJECT) {
136#ifndef TIOCSTI
137		if (!ttyset && hp->h_subject != NULL)
138			ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
139#endif
140		hp->h_subject = readtty("Subject: ", hp->h_subject);
141	}
142	if (gflags & GCC) {
143#ifndef TIOCSTI
144		if (!ttyset && hp->h_cc != NIL)
145			ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
146#endif
147		hp->h_cc =
148			extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC);
149	}
150	if (gflags & GBCC) {
151#ifndef TIOCSTI
152		if (!ttyset && hp->h_bcc != NIL)
153			ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
154#endif
155		hp->h_bcc =
156			extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC);
157	}
158out:
159	(void)signal(SIGTSTP, savetstp);
160	(void)signal(SIGTTOU, savettou);
161	(void)signal(SIGTTIN, savettin);
162#ifndef TIOCSTI
163	ttybuf.c_cc[VERASE] = c_erase;
164	ttybuf.c_cc[VKILL] = c_kill;
165	if (ttyset)
166		tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
167	(void)signal(SIGQUIT, savequit);
168#else
169# ifdef	TIOCEXT
170	if (extproc) {
171		flag = 1;
172		if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0)
173			warn("TIOCEXT: on");
174	}
175# endif	/* TIOCEXT */
176#endif
177	(void)signal(SIGINT, saveint);
178	return(errs);
179}
180
181/*
182 * Read up a header from standard input.
183 * The source string has the preliminary contents to
184 * be read.
185 *
186 */
187
188char *
189readtty(pr, src)
190	char pr[], src[];
191{
192	char ch, canonb[BUFSIZ];
193	int c;
194	char *cp, *cp2;
195#if __GNUC__
196	/* Avoid siglongjmp clobbering */
197	(void)&c;
198	(void)&cp2;
199#endif
200
201	fputs(pr, stdout);
202	fflush(stdout);
203	if (src != NULL && strlen(src) > BUFSIZ - 2) {
204		puts("too long to edit");
205		return(src);
206	}
207#ifndef TIOCSTI
208	if (src != NULL)
209		cp = copy(src, canonb);
210	else
211		cp = copy("", canonb);
212	fputs(canonb, stdout);
213	fflush(stdout);
214#else
215	cp = src == NULL ? "" : src;
216	while ((c = *cp++) != '\0') {
217		if ((c_erase != _POSIX_VDISABLE && c == c_erase) ||
218		    (c_kill != _POSIX_VDISABLE && c == c_kill)) {
219			ch = '\\';
220			ioctl(0, TIOCSTI, &ch);
221		}
222		ch = c;
223		ioctl(0, TIOCSTI, &ch);
224	}
225	cp = canonb;
226	*cp = 0;
227#endif
228	cp2 = cp;
229	while (cp2 < canonb + BUFSIZ)
230		*cp2++ = 0;
231	cp2 = cp;
232	if (sigsetjmp(rewrite, 1))
233		goto redo;
234	(void)signal(SIGTSTP, ttystop);
235	(void)signal(SIGTTOU, ttystop);
236	(void)signal(SIGTTIN, ttystop);
237	clearerr(stdin);
238	while (cp2 < canonb + BUFSIZ) {
239		c = getc(stdin);
240		if (c == EOF || c == '\n')
241			break;
242		*cp2++ = c;
243	}
244	*cp2 = 0;
245	(void)signal(SIGTSTP, SIG_DFL);
246	(void)signal(SIGTTOU, SIG_DFL);
247	(void)signal(SIGTTIN, SIG_DFL);
248	if (c == EOF && ferror(stdin)) {
249redo:
250		cp = strlen(canonb) > 0 ? canonb : NULL;
251		clearerr(stdin);
252		return(readtty(pr, cp));
253	}
254#ifndef TIOCSTI
255	if (cp == NULL || *cp == '\0')
256		return(src);
257	cp2 = cp;
258	if (!ttyset)
259		return(strlen(canonb) > 0 ? savestr(canonb) : NULL);
260	while (*cp != '\0') {
261		c = *cp++;
262		if (c_erase != _POSIX_VDISABLE && c == c_erase) {
263			if (cp2 == canonb)
264				continue;
265			if (cp2[-1] == '\\') {
266				cp2[-1] = c;
267				continue;
268			}
269			cp2--;
270			continue;
271		}
272		if (c_kill != _POSIX_VDISABLE && c == c_kill) {
273			if (cp2 == canonb)
274				continue;
275			if (cp2[-1] == '\\') {
276				cp2[-1] = c;
277				continue;
278			}
279			cp2 = canonb;
280			continue;
281		}
282		*cp2++ = c;
283	}
284	*cp2 = '\0';
285#endif
286	if (equal("", canonb))
287		return(NULL);
288	return(savestr(canonb));
289}
290
291/*
292 * Receipt continuation.
293 */
294void
295ttystop(s)
296	int s;
297{
298	sig_t old_action = signal(s, SIG_DFL);
299	sigset_t nset;
300
301	(void)sigemptyset(&nset);
302	(void)sigaddset(&nset, s);
303	(void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
304	(void)kill(0, s);
305	(void)sigprocmask(SIG_BLOCK, &nset, NULL);
306	(void)signal(s, old_action);
307	siglongjmp(rewrite, 1);
308}
309
310/*ARGSUSED*/
311void
312ttyint(s)
313	int s;
314{
315	siglongjmp(intjmp, 1);
316}
317