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/* $OpenBSD: tty.c,v 1.12 2001/06/23 23:04:23 millert Exp $ */
/* $NetBSD: tty.c,v 1.7 1997/07/09 05:25:46 mikel Exp $ */
/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* 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) 4/20/95";
#else
static char rcsid[] = "$OpenBSD: tty.c,v 1.12 2001/06/23 23:04:23 millert Exp $";
#endif
#endif /* not lint */
/*
* Mail -- a mail program
*
* Generally useful tty stuff.
*/
#include "rcv.h"
#include "extern.h"
#include <sys/ioctl.h>
static cc_t c_erase; /* Current erase char */
static cc_t c_kill; /* Current kill char */
static sigjmp_buf rewrite; /* Place to go when continued */
static sigjmp_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
grabh(hp, gflags)
struct header *hp;
int gflags;
{
struct termios ttybuf;
volatile sig_t saveint;
#ifndef TIOCSTI
sig_t savequit;
#else
# ifdef TIOCEXT
volatile int extproc;
int flag;
# endif /* TIOCEXT */
#endif
sig_t savetstp;
sig_t savettou;
sig_t savettin;
volatile int errs = 0;
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");
return(-1);
}
c_erase = ttybuf.c_cc[VERASE];
c_kill = ttybuf.c_cc[VKILL];
#ifndef TIOCSTI
ttybuf.c_cc[VERASE] = 0;
ttybuf.c_cc[VKILL] = 0;
if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL)
(void)signal(SIGINT, SIG_DFL);
if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL)
(void)signal(SIGQUIT, SIG_DFL);
#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 */
if (sigsetjmp(intjmp, 1)) {
errs = SIGINT;
goto out;
}
saveint = signal(SIGINT, ttyint);
#endif
if (gflags & GTO) {
#ifndef TIOCSTI
if (!ttyset && hp->h_to != NIL)
ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
#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);
#endif
hp->h_subject = readtty("Subject: ", hp->h_subject);
}
if (gflags & GCC) {
#ifndef TIOCSTI
if (!ttyset && hp->h_cc != NIL)
ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
#endif
hp->h_cc =
extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC);
}
if (gflags & GBCC) {
#ifndef TIOCSTI
if (!ttyset && hp->h_bcc != NIL)
ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
#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);
#ifndef TIOCSTI
ttybuf.c_cc[VERASE] = c_erase;
ttybuf.c_cc[VKILL] = c_kill;
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 */
#endif
(void)signal(SIGINT, saveint);
return(errs);
}
/*
* Read up a header from standard input.
* The source string has the preliminary contents to
* be read.
*
*/
char *
readtty(pr, src)
char pr[], src[];
{
char ch, canonb[BUFSIZ];
volatile int c;
char *cp, * volatile cp2;
fputs(pr, stdout);
fflush(stdout);
if (src != NULL && strlen(src) > BUFSIZ - 2) {
puts("too long to edit");
return(src);
}
#ifndef TIOCSTI
if (src != NULL)
cp = copy(src, canonb);
else
cp = copy("", canonb);
fputs(canonb, stdout);
fflush(stdout);
#else
cp = src == NULL ? "" : src;
while ((c = *cp++) != '\0') {
if ((c_erase != _POSIX_VDISABLE && c == c_erase) ||
(c_kill != _POSIX_VDISABLE && c == c_kill)) {
ch = '\\';
ioctl(0, TIOCSTI, &ch);
}
ch = c;
ioctl(0, TIOCSTI, &ch);
}
cp = canonb;
*cp = 0;
#endif
cp2 = cp;
while (cp2 < canonb + BUFSIZ)
*cp2++ = 0;
cp2 = cp;
if (sigsetjmp(rewrite, 1))
goto redo;
(void)signal(SIGTSTP, ttystop);
(void)signal(SIGTTOU, ttystop);
(void)signal(SIGTTIN, ttystop);
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);
if (c == EOF && ferror(stdin)) {
redo:
cp = strlen(canonb) > 0 ? canonb : NULL;
clearerr(stdin);
return(readtty(pr, cp));
}
#ifndef TIOCSTI
if (cp == NULL || *cp == '\0')
return(src);
cp2 = cp;
if (!ttyset)
return(strlen(canonb) > 0 ? savestr(canonb) : NULL);
while (*cp != '\0') {
c = *cp++;
if (c_erase != _POSIX_VDISABLE && c == c_erase) {
if (cp2 == canonb)
continue;
if (cp2[-1] == '\\') {
cp2[-1] = c;
continue;
}
cp2--;
continue;
}
if (c_kill != _POSIX_VDISABLE && c == c_kill) {
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));
}
/*
* Receipt continuation.
*/
void
ttystop(s)
int s;
{
sig_t old_action = signal(s, SIG_DFL);
sigset_t nset;
(void)sigemptyset(&nset);
(void)sigaddset(&nset, s);
(void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
(void)kill(0, s);
(void)sigprocmask(SIG_BLOCK, &nset, NULL);
(void)signal(s, old_action);
siglongjmp(rewrite, 1);
}
/*ARGSUSED*/
void
ttyint(s)
int s;
{
siglongjmp(intjmp, 1);
}
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