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/* $OpenBSD: terminal.c,v 1.14 2017/07/07 09:14:26 fcambus Exp $ */
/* $NetBSD: terminal.c,v 1.5 1996/02/28 21:04:17 thorpej Exp $ */
/*
* Copyright (c) 1988, 1990, 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.
*/
#include "telnet_locl.h"
#include <arpa/telnet.h>
#include <errno.h>
#include <unistd.h>
Ring ttyoring, ttyiring;
unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
int termdata; /* Debugging flag */
/*
* initialize the terminal data structures.
*/
void
init_terminal(void)
{
struct termios tc;
ring_init(&ttyoring, ttyobuf, sizeof ttyobuf);
ring_init(&ttyiring, ttyibuf, sizeof ttyibuf);
tcgetattr(0, &tc);
autoflush = (tc.c_lflag & NOFLSH) == 0;
}
/*
* Send as much data as possible to the terminal.
*
* Return value:
* -1: No useful work done, data waiting to go out.
* 0: No data was waiting, so nothing was done.
* 1: All waiting data was written out.
* n: All data - n was written out.
*/
int
ttyflush(int drop)
{
int n, n0, n1;
n0 = ring_full_count(&ttyoring);
if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
if (drop) {
tcflush(fileno(stdout), TCOFLUSH);
/* we leave 'n' alone! */
} else {
n = write(tout, ttyoring.consume, n);
}
}
if (n > 0) {
if (termdata && n) {
Dump('>', ttyoring.consume, n);
}
/*
* If we wrote everything, and the full count is
* larger than what we wrote, then write the
* rest of the buffer.
*/
if (n1 == n && n0 > n) {
n1 = n0 - n;
if (!drop)
n1 = write(tout, ttyoring.bottom, n1);
if (n1 > 0)
n += n1;
}
ring_consumed(&ttyoring, n);
}
if (n < 0) {
if (errno == EPIPE)
kill(0, SIGQUIT);
return -1;
}
if (n == n0) {
if (n0)
return -1;
return 0;
}
return n0 - n + 1;
}
/*
* These routines decides on what the mode should be (based on the values
* of various global variables).
*/
int
getconnmode(void)
{
int mode = 0;
if (my_want_state_is_dont(TELOPT_ECHO))
mode |= MODE_ECHO;
if (localflow)
mode |= MODE_FLOW;
if ((eight & 1) || my_want_state_is_will(TELOPT_BINARY))
mode |= MODE_INBIN;
if (eight & 2)
mode |= MODE_OUT8;
if (his_want_state_is_will(TELOPT_BINARY))
mode |= MODE_OUTBIN;
#ifdef KLUDGELINEMODE
if (kludgelinemode) {
if (my_want_state_is_dont(TELOPT_SGA)) {
mode |= (MODE_TRAPSIG|MODE_EDIT);
if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
mode &= ~MODE_ECHO;
}
}
return(mode);
}
#endif
if (my_want_state_is_will(TELOPT_LINEMODE))
mode |= linemode;
return(mode);
}
void
setconnmode(int force)
{
int newmode;
newmode = getconnmode()|(force?MODE_FORCE:0);
TerminalNewMode(newmode);
}
void
setcommandmode(void)
{
TerminalNewMode(-1);
}
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