freebsd-skq/usr.bin/mail/tty.c
Warner Losh fbbd9655e5 Renumber copyright clause 4
Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by:	Jan Schaumann <jschauma@stevens.edu>
Pull Request:	https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00

290 lines
6.9 KiB
C

/*
* 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
* 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
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* 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 */
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
grabh(struct header *hp, int gflags)
{
struct termios ttybuf;
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 */
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);
}
c_erase = ttybuf.c_cc[VERASE];
c_kill = ttybuf.c_cc[VKILL];
#ifndef TIOCSTI
ttybuf.c_cc[VERASE] = _POSIX_VDISABLE;
ttybuf.c_cc[VKILL] = _POSIX_VDISABLE;
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 (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);
#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 != NULL)
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 != NULL)
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(const char *pr, char src[])
{
char ch, canonb[BUFSIZ];
int c;
char *cp, *cp2;
fputs(pr, stdout);
(void)fflush(stdout);
if (src != NULL && strlen(src) > BUFSIZ - 2) {
printf("too long to edit\n");
return (src);
}
#ifndef TIOCSTI
if (src != NULL)
strlcpy(canonb, src, sizeof(canonb));
else
*canonb = '\0';
fputs(canonb, stdout);
(void)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 (setjmp(rewrite))
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(int s)
{
sig_t old_action = signal(s, SIG_DFL);
sigset_t nset;
(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);
longjmp(rewrite, 1);
}
void
ttyint(int s __unused)
{
longjmp(intjmp, 1);
}