/usr.bin/mail/tty.c

  1/*
  2 * Copyright (c) 1980, 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 * 4. 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
 30#ifndef lint
 31#if 0
 32static char sccsid[] = "@(#)tty.c	8.2 (Berkeley) 6/6/93";
 33#endif
 34#endif /* not lint */
 35#include <sys/cdefs.h>
 36__FBSDID("$FreeBSD$");
 37
 38/*
 39 * Mail -- a mail program
 40 *
 41 * Generally useful tty stuff.
 42 */
 43
 44#include "rcv.h"
 45#include "extern.h"
 46
 47static	cc_t	c_erase;		/* Current erase char */
 48static	cc_t	c_kill;			/* Current kill char */
 49static	jmp_buf	rewrite;		/* Place to go when continued */
 50static	jmp_buf	intjmp;			/* Place to go when interrupted */
 51#ifndef TIOCSTI
 52static	int	ttyset;			/* We must now do erase/kill */
 53#endif
 54
 55/*
 56 * Read all relevant header fields.
 57 */
 58
 59int
 60grabh(struct header *hp, int gflags)
 61{
 62	struct termios ttybuf;
 63	sig_t saveint;
 64	sig_t savetstp;
 65	sig_t savettou;
 66	sig_t savettin;
 67	int errs;
 68#ifndef TIOCSTI
 69	sig_t savequit;
 70#else
 71# ifdef TIOCEXT
 72	int extproc, flag;
 73# endif /* TIOCEXT */
 74#endif /* TIOCSTI */
 75
 76	savetstp = signal(SIGTSTP, SIG_DFL);
 77	savettou = signal(SIGTTOU, SIG_DFL);
 78	savettin = signal(SIGTTIN, SIG_DFL);
 79	errs = 0;
 80#ifndef TIOCSTI
 81	ttyset = 0;
 82#endif
 83	if (tcgetattr(fileno(stdin), &ttybuf) < 0) {
 84		warn("tcgetattr(stdin)");
 85		return (-1);
 86	}
 87	c_erase = ttybuf.c_cc[VERASE];
 88	c_kill = ttybuf.c_cc[VKILL];
 89#ifndef TIOCSTI
 90	ttybuf.c_cc[VERASE] = _POSIX_VDISABLE;
 91	ttybuf.c_cc[VKILL] = _POSIX_VDISABLE;
 92	if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL)
 93		(void)signal(SIGINT, SIG_DFL);
 94	if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL)
 95		(void)signal(SIGQUIT, SIG_DFL);
 96#else
 97# ifdef		TIOCEXT
 98	extproc = ((ttybuf.c_lflag & EXTPROC) ? 1 : 0);
 99	if (extproc) {
100		flag = 0;
101		if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0)
102			warn("TIOCEXT: off");
103	}
104# endif	/* TIOCEXT */
105	if (setjmp(intjmp))
106		goto out;
107	saveint = signal(SIGINT, ttyint);
108#endif
109	if (gflags & GTO) {
110#ifndef TIOCSTI
111		if (!ttyset && hp->h_to != NULL)
112			ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
113#endif
114		hp->h_to =
115			extract(readtty("To: ", detract(hp->h_to, 0)), GTO);
116	}
117	if (gflags & GSUBJECT) {
118#ifndef TIOCSTI
119		if (!ttyset && hp->h_subject != NULL)
120			ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
121#endif
122		hp->h_subject = readtty("Subject: ", hp->h_subject);
123	}
124	if (gflags & GCC) {
125#ifndef TIOCSTI
126		if (!ttyset && hp->h_cc != NULL)
127			ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
128#endif
129		hp->h_cc =
130			extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC);
131	}
132	if (gflags & GBCC) {
133#ifndef TIOCSTI
134		if (!ttyset && hp->h_bcc != NULL)
135			ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
136#endif
137		hp->h_bcc =
138			extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC);
139	}
140out:
141	(void)signal(SIGTSTP, savetstp);
142	(void)signal(SIGTTOU, savettou);
143	(void)signal(SIGTTIN, savettin);
144#ifndef TIOCSTI
145	ttybuf.c_cc[VERASE] = c_erase;
146	ttybuf.c_cc[VKILL] = c_kill;
147	if (ttyset)
148		tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
149	(void)signal(SIGQUIT, savequit);
150#else
151# ifdef		TIOCEXT
152	if (extproc) {
153		flag = 1;
154		if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0)
155			warn("TIOCEXT: on");
156	}
157# endif	/* TIOCEXT */
158#endif
159	(void)signal(SIGINT, saveint);
160	return (errs);
161}
162
163/*
164 * Read up a header from standard input.
165 * The source string has the preliminary contents to
166 * be read.
167 *
168 */
169
170char *
171readtty(const char *pr, char src[])
172{
173	char ch, canonb[BUFSIZ];
174	int c;
175	char *cp, *cp2;
176
177	fputs(pr, stdout);
178	(void)fflush(stdout);
179	if (src != NULL && strlen(src) > BUFSIZ - 2) {
180		printf("too long to edit\n");
181		return (src);
182	}
183#ifndef TIOCSTI
184	if (src != NULL)
185		strlcpy(canonb, src, sizeof(canonb));
186	else
187		*canonb = '\0';
188	fputs(canonb, stdout);
189	(void)fflush(stdout);
190#else
191	cp = src == NULL ? "" : src;
192	while ((c = *cp++) != '\0') {
193		if ((c_erase != _POSIX_VDISABLE && c == c_erase) ||
194		    (c_kill != _POSIX_VDISABLE && c == c_kill)) {
195			ch = '\\';
196			ioctl(0, TIOCSTI, &ch);
197		}
198		ch = c;
199		ioctl(0, TIOCSTI, &ch);
200	}
201	cp = canonb;
202	*cp = '\0';
203#endif
204	cp2 = cp;
205	while (cp2 < canonb + BUFSIZ)
206		*cp2++ = '\0';
207	cp2 = cp;
208	if (setjmp(rewrite))
209		goto redo;
210	(void)signal(SIGTSTP, ttystop);
211	(void)signal(SIGTTOU, ttystop);
212	(void)signal(SIGTTIN, ttystop);
213	clearerr(stdin);
214	while (cp2 < canonb + BUFSIZ) {
215		c = getc(stdin);
216		if (c == EOF || c == '\n')
217			break;
218		*cp2++ = c;
219	}
220	*cp2 = '\0';
221	(void)signal(SIGTSTP, SIG_DFL);
222	(void)signal(SIGTTOU, SIG_DFL);
223	(void)signal(SIGTTIN, SIG_DFL);
224	if (c == EOF && ferror(stdin)) {
225redo:
226		cp = strlen(canonb) > 0 ? canonb : NULL;
227		clearerr(stdin);
228		return (readtty(pr, cp));
229	}
230#ifndef TIOCSTI
231	if (cp == NULL || *cp == '\0')
232		return (src);
233	cp2 = cp;
234	if (!ttyset)
235		return (strlen(canonb) > 0 ? savestr(canonb) : NULL);
236	while (*cp != '\0') {
237		c = *cp++;
238		if (c_erase != _POSIX_VDISABLE && c == c_erase) {
239			if (cp2 == canonb)
240				continue;
241			if (cp2[-1] == '\\') {
242				cp2[-1] = c;
243				continue;
244			}
245			cp2--;
246			continue;
247		}
248		if (c_kill != _POSIX_VDISABLE && c == c_kill) {
249			if (cp2 == canonb)
250				continue;
251			if (cp2[-1] == '\\') {
252				cp2[-1] = c;
253				continue;
254			}
255			cp2 = canonb;
256			continue;
257		}
258		*cp2++ = c;
259	}
260	*cp2 = '\0';
261#endif
262	if (equal("", canonb))
263		return (NULL);
264	return (savestr(canonb));
265}
266
267/*
268 * Receipt continuation.
269 */
270void
271ttystop(int s)
272{
273	sig_t old_action = signal(s, SIG_DFL);
274	sigset_t nset;
275
276	(void)sigemptyset(&nset);
277	(void)sigaddset(&nset, s);
278	(void)sigprocmask(SIG_BLOCK, &nset, NULL);
279	kill(0, s);
280	(void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
281	(void)signal(s, old_action);
282	longjmp(rewrite, 1);
283}
284
285void
286ttyint(int s __unused)
287{
288	longjmp(intjmp, 1);
289}