1/*
2 * Copyright (c) 1988, 1990, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if 0
35#ifndef lint
36static const char sccsid[] = "@(#)terminal.c	8.2 (Berkeley) 2/16/95";
37#endif
38#endif
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: src/contrib/telnet/telnet/terminal.c,v 1.7 2003/05/04 02:54:48 obrien Exp $");
41
42#include <arpa/telnet.h>
43#include <sys/types.h>
44
45#include <stdlib.h>
46
47#include "ring.h"
48
49#include "externs.h"
50#include "types.h"
51
52#ifdef	ENCRYPTION
53#include <libtelnet/encrypt.h>
54#endif
55
56Ring		ttyoring, ttyiring;
57unsigned char	ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
58
59int termdata;			/* Debugging flag */
60
61#ifdef	USE_TERMIO
62# ifndef VDISCARD
63cc_t termFlushChar;
64# endif
65# ifndef VLNEXT
66cc_t termLiteralNextChar;
67# endif
68# ifndef VSUSP
69cc_t termSuspChar;
70# endif
71# ifndef VWERASE
72cc_t termWerasChar;
73# endif
74# ifndef VREPRINT
75cc_t termRprntChar;
76# endif
77# ifndef VSTART
78cc_t termStartChar;
79# endif
80# ifndef VSTOP
81cc_t termStopChar;
82# endif
83# ifndef VEOL
84cc_t termForw1Char;
85# endif
86# ifndef VEOL2
87cc_t termForw2Char;
88# endif
89# ifndef VSTATUS
90cc_t termAytChar;
91# endif
92#else
93cc_t termForw2Char;
94cc_t termAytChar;
95#endif
96
97/*
98 * initialize the terminal data structures.
99 */
100
101void
102init_terminal(void)
103{
104    if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) {
105	exit(1);
106    }
107    if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) {
108	exit(1);
109    }
110    autoflush = TerminalAutoFlush();
111}
112
113/*
114 *		Send as much data as possible to the terminal.
115 *
116 *		Return value:
117 *			-1: No useful work done, data waiting to go out.
118 *			 0: No data was waiting, so nothing was done.
119 *			 1: All waiting data was written out.
120 *			 n: All data - n was written out.
121 */
122
123int
124ttyflush(int drop)
125{
126    int n, n0, n1;
127
128    n0 = ring_full_count(&ttyoring);
129    if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
130	if (drop) {
131	    TerminalFlushOutput();
132	    /* we leave 'n' alone! */
133	} else {
134	    n = TerminalWrite(ttyoring.consume, n);
135	}
136    }
137    if (n > 0) {
138	if (termdata && n) {
139	    Dump('>', ttyoring.consume, n);
140	}
141	/*
142	 * If we wrote everything, and the full count is
143	 * larger than what we wrote, then write the
144	 * rest of the buffer.
145	 */
146	if (n1 == n && n0 > n) {
147		n1 = n0 - n;
148		if (!drop)
149			n1 = TerminalWrite(ttyoring.bottom, n1);
150		if (n1 > 0)
151			n += n1;
152	}
153	ring_consumed(&ttyoring, n);
154    }
155    if (n < 0)
156	return -1;
157    if (n == n0) {
158	if (n0)
159	    return -1;
160	return 0;
161    }
162    return n0 - n + 1;
163}
164
165
166/*
167 * These routines decides on what the mode should be (based on the values
168 * of various global variables).
169 */
170
171
172int
173getconnmode(void)
174{
175    extern int linemode;
176    int mode = 0;
177#ifdef	KLUDGELINEMODE
178    extern int kludgelinemode;
179#endif
180
181    if (my_want_state_is_dont(TELOPT_ECHO))
182	mode |= MODE_ECHO;
183
184    if (localflow)
185	mode |= MODE_FLOW;
186
187    if (my_want_state_is_will(TELOPT_BINARY))
188	mode |= MODE_INBIN;
189
190    if (his_want_state_is_will(TELOPT_BINARY))
191	mode |= MODE_OUTBIN;
192
193#ifdef	KLUDGELINEMODE
194    if (kludgelinemode) {
195	if (my_want_state_is_dont(TELOPT_SGA)) {
196	    mode |= (MODE_TRAPSIG|MODE_EDIT);
197	    if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
198		mode &= ~MODE_ECHO;
199	    }
200	}
201	return(mode);
202    }
203#endif
204    if (my_want_state_is_will(TELOPT_LINEMODE))
205	mode |= linemode;
206    return(mode);
207}
208
209void
210setconnmode(int force)
211{
212#ifdef	ENCRYPTION
213    static int enc_passwd = 0;
214#endif	/* ENCRYPTION */
215    int newmode;
216
217    newmode = getconnmode()|(force?MODE_FORCE:0);
218
219    TerminalNewMode(newmode);
220
221#ifdef  ENCRYPTION
222    if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
223	if (my_want_state_is_will(TELOPT_ENCRYPT)
224				&& (enc_passwd == 0) && !encrypt_output) {
225	    encrypt_request_start(0, 0);
226	    enc_passwd = 1;
227	}
228    } else {
229	if (enc_passwd) {
230	    encrypt_request_end();
231	    enc_passwd = 0;
232	}
233    }
234#endif	/* ENCRYPTION */
235
236}
237
238void
239setcommandmode(void)
240{
241    TerminalNewMode(-1);
242}
243