freebsd-dev/usr.bin/mail/tty.c

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
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* Copyright (c) 1980, 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
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* 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.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)tty.c 8.2 (Berkeley) 6/6/93";
#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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/*
* Mail -- a mail program
*
* Generally useful tty stuff.
*/
#include "rcv.h"
#include "extern.h"
static cc_t c_erase; /* Current erase char */
static cc_t c_kill; /* Current kill char */
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static jmp_buf rewrite; /* Place to go when continued */
static jmp_buf intjmp; /* Place to go when interrupted */
#ifndef TIOCSTI
static int ttyset; /* We must now do erase/kill */
#endif
/*
* Read all relevant header fields.
*/
int
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grabh(struct header *hp, int gflags)
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{
struct termios ttybuf;
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sig_t saveint;
sig_t savetstp;
sig_t savettou;
sig_t savettin;
int errs;
#ifndef TIOCSTI
sig_t savequit;
#else
# ifdef TIOCEXT
int extproc, flag;
# endif /* TIOCEXT */
#endif /* TIOCSTI */
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savetstp = signal(SIGTSTP, SIG_DFL);
savettou = signal(SIGTTOU, SIG_DFL);
savettin = signal(SIGTTIN, SIG_DFL);
errs = 0;
#ifndef TIOCSTI
ttyset = 0;
#endif
if (tcgetattr(fileno(stdin), &ttybuf) < 0) {
warn("tcgetattr(stdin)");
return (-1);
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}
c_erase = ttybuf.c_cc[VERASE];
c_kill = ttybuf.c_cc[VKILL];
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#ifndef TIOCSTI
ttybuf.c_cc[VERASE] = _POSIX_VDISABLE;
ttybuf.c_cc[VKILL] = _POSIX_VDISABLE;
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if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL)
(void)signal(SIGINT, SIG_DFL);
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if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL)
(void)signal(SIGQUIT, SIG_DFL);
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#else
# ifdef TIOCEXT
extproc = ((ttybuf.c_lflag & EXTPROC) ? 1 : 0);
if (extproc) {
flag = 0;
if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0)
warn("TIOCEXT: off");
}
# endif /* TIOCEXT */
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if (setjmp(intjmp))
goto out;
saveint = signal(SIGINT, ttyint);
#endif
if (gflags & GTO) {
#ifndef TIOCSTI
if (!ttyset && hp->h_to != NULL)
ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
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#endif
hp->h_to =
extract(readtty("To: ", detract(hp->h_to, 0)), GTO);
}
if (gflags & GSUBJECT) {
#ifndef TIOCSTI
if (!ttyset && hp->h_subject != NULL)
ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
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#endif
hp->h_subject = readtty("Subject: ", hp->h_subject);
}
if (gflags & GCC) {
#ifndef TIOCSTI
if (!ttyset && hp->h_cc != NULL)
ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
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#endif
hp->h_cc =
extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC);
}
if (gflags & GBCC) {
#ifndef TIOCSTI
if (!ttyset && hp->h_bcc != NULL)
ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
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#endif
hp->h_bcc =
extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC);
}
out:
(void)signal(SIGTSTP, savetstp);
(void)signal(SIGTTOU, savettou);
(void)signal(SIGTTIN, savettin);
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#ifndef TIOCSTI
ttybuf.c_cc[VERASE] = c_erase;
ttybuf.c_cc[VKILL] = c_kill;
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if (ttyset)
tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
(void)signal(SIGQUIT, savequit);
#else
# ifdef TIOCEXT
if (extproc) {
flag = 1;
if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0)
warn("TIOCEXT: on");
}
# endif /* TIOCEXT */
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#endif
(void)signal(SIGINT, saveint);
return (errs);
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}
/*
* Read up a header from standard input.
* The source string has the preliminary contents to
* be read.
*
*/
char *
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readtty(const char *pr, char src[])
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{
char ch, canonb[BUFSIZ];
int c;
char *cp, *cp2;
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fputs(pr, stdout);
(void)fflush(stdout);
if (src != NULL && strlen(src) > BUFSIZ - 2) {
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printf("too long to edit\n");
return (src);
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}
#ifndef TIOCSTI
if (src != NULL)
strlcpy(canonb, src, sizeof(canonb));
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else
*canonb = '\0';
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fputs(canonb, stdout);
(void)fflush(stdout);
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#else
cp = src == NULL ? "" : src;
while ((c = *cp++) != '\0') {
if ((c_erase != _POSIX_VDISABLE && c == c_erase) ||
(c_kill != _POSIX_VDISABLE && c == c_kill)) {
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ch = '\\';
ioctl(0, TIOCSTI, &ch);
}
ch = c;
ioctl(0, TIOCSTI, &ch);
}
cp = canonb;
*cp = '\0';
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#endif
cp2 = cp;
while (cp2 < canonb + BUFSIZ)
*cp2++ = '\0';
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cp2 = cp;
if (setjmp(rewrite))
goto redo;
(void)signal(SIGTSTP, ttystop);
(void)signal(SIGTTOU, ttystop);
(void)signal(SIGTTIN, ttystop);
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clearerr(stdin);
while (cp2 < canonb + BUFSIZ) {
c = getc(stdin);
if (c == EOF || c == '\n')
break;
*cp2++ = c;
}
*cp2 = '\0';
(void)signal(SIGTSTP, SIG_DFL);
(void)signal(SIGTTOU, SIG_DFL);
(void)signal(SIGTTIN, SIG_DFL);
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if (c == EOF && ferror(stdin)) {
redo:
cp = strlen(canonb) > 0 ? canonb : NULL;
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clearerr(stdin);
return (readtty(pr, cp));
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}
#ifndef TIOCSTI
if (cp == NULL || *cp == '\0')
return (src);
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cp2 = cp;
if (!ttyset)
return (strlen(canonb) > 0 ? savestr(canonb) : NULL);
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while (*cp != '\0') {
c = *cp++;
if (c_erase != _POSIX_VDISABLE && c == c_erase) {
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if (cp2 == canonb)
continue;
if (cp2[-1] == '\\') {
cp2[-1] = c;
continue;
}
cp2--;
continue;
}
if (c_kill != _POSIX_VDISABLE && c == c_kill) {
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if (cp2 == canonb)
continue;
if (cp2[-1] == '\\') {
cp2[-1] = c;
continue;
}
cp2 = canonb;
continue;
}
*cp2++ = c;
}
*cp2 = '\0';
#endif
if (equal("", canonb))
return (NULL);
return (savestr(canonb));
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}
/*
* Receipt continuation.
*/
void
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ttystop(int s)
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{
sig_t old_action = signal(s, SIG_DFL);
sigset_t nset;
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(void)sigemptyset(&nset);
(void)sigaddset(&nset, s);
(void)sigprocmask(SIG_BLOCK, &nset, NULL);
kill(0, s);
(void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
(void)signal(s, old_action);
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longjmp(rewrite, 1);
}
void
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ttyint(int s __unused)
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{
longjmp(intjmp, 1);
}