214 lines
4.9 KiB
C
214 lines
4.9 KiB
C
/* $NetBSD: terminal.c,v 1.13 2003/08/07 11:16:11 agc Exp $ */
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/*
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* Copyright (c) 1988, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 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
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)terminal.c 8.2 (Berkeley) 2/16/95";
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#else
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__RCSID("$NetBSD: terminal.c,v 1.13 2003/08/07 11:16:11 agc Exp $");
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#endif
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#endif /* not lint */
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#include <arpa/telnet.h>
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#include <sys/types.h>
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#include "ring.h"
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#include "externs.h"
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#include "types.h"
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#ifdef ENCRYPTION
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#include <libtelnet/encrypt.h>
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#endif
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Ring ttyoring, ttyiring;
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unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
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int termdata; /* Debugging flag */
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/*
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* initialize the terminal data structures.
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*/
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void
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init_terminal(void)
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{
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if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) {
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exit(1);
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}
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if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) {
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exit(1);
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}
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autoflush = TerminalAutoFlush();
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}
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/*
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* Send as much data as possible to the terminal.
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*
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* Return value:
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* -2: Permanent error writing to FD.
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* -1: No useful work done, data waiting to go out.
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* 0: No data was waiting, so nothing was done.
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* 1: All waiting data was written out.
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* n: All data - n was written out.
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*/
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int
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ttyflush(int drop)
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{
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int n, n0, n1;
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n0 = ring_full_count(&ttyoring);
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if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
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if (drop) {
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TerminalFlushOutput();
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/* we leave 'n' alone! */
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} else {
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n = TerminalWrite(ttyoring.consume, n);
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}
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}
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if (n > 0) {
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if (termdata && n) {
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Dump('>', ttyoring.consume, n);
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}
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/*
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* If we wrote everything, and the full count is
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* larger than what we wrote, then write the
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* rest of the buffer.
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*/
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if (n1 == n && n0 > n) {
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n1 = n0 - n;
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if (!drop)
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n1 = TerminalWrite(ttyoring.bottom, n1);
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if (n1 > 0)
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n += n1;
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}
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ring_consumed(&ttyoring, n);
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}
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if (n < 0) {
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if (errno == EAGAIN)
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return -1;
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else
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return -2;
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}
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if (n == n0) {
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if (n0)
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return -1;
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return 0;
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}
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return n0 - n + 1;
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}
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/*
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* These routines decides on what the mode should be (based on the values
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* of various global variables).
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*/
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int
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getconnmode(void)
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{
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extern int linemode;
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int mode = 0;
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#ifdef KLUDGELINEMODE
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extern int kludgelinemode;
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#endif
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if (In3270)
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return(MODE_FLOW);
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if (my_want_state_is_dont(TELOPT_ECHO))
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mode |= MODE_ECHO;
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if (localflow)
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mode |= MODE_FLOW;
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if (my_want_state_is_will(TELOPT_BINARY))
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mode |= MODE_INBIN;
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if (his_want_state_is_will(TELOPT_BINARY))
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mode |= MODE_OUTBIN;
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#ifdef KLUDGELINEMODE
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if (kludgelinemode) {
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if (my_want_state_is_dont(TELOPT_SGA)) {
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mode |= (MODE_TRAPSIG|MODE_EDIT);
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if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
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mode &= ~MODE_ECHO;
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}
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}
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return(mode);
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}
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#endif
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if (my_want_state_is_will(TELOPT_LINEMODE))
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mode |= linemode;
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return(mode);
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}
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void
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setconnmode(int force)
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{
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#ifdef ENCRYPTION
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static int enc_passwd = 0;
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#endif
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int newmode;
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newmode = getconnmode()|(force?MODE_FORCE:0);
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TerminalNewMode(newmode);
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#ifdef ENCRYPTION
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if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
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if (my_want_state_is_will(TELOPT_ENCRYPT)
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&& (enc_passwd == 0) && !encrypt_output) {
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encrypt_request_start(0, 0);
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enc_passwd = 1;
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}
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} else {
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if (enc_passwd) {
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encrypt_request_end();
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enc_passwd = 0;
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}
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}
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#endif /* ENCRYPTION */
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}
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void
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setcommandmode(void)
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{
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TerminalNewMode(-1);
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}
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