terminal.c revision 57416 
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#include "telnet_locl.h"
35
36RCSID("$Id: terminal.c,v 1.10 1997/12/15 19:53:06 joda Exp $");
37
38Ring		ttyoring, ttyiring;
39unsigned char	ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
40
41int termdata;			/* Debugging flag */
42
43# ifndef VDISCARD
44cc_t termFlushChar;
45# endif
46# ifndef VLNEXT
47cc_t termLiteralNextChar;
48# endif
49# ifndef VSUSP
50cc_t termSuspChar;
51# endif
52# ifndef VWERASE
53cc_t termWerasChar;
54# endif
55# ifndef VREPRINT
56cc_t termRprntChar;
57# endif
58# ifndef VSTART
59cc_t termStartChar;
60# endif
61# ifndef VSTOP
62cc_t termStopChar;
63# endif
64# ifndef VEOL
65cc_t termForw1Char;
66# endif
67# ifndef VEOL2
68cc_t termForw2Char;
69# endif
70# ifndef VSTATUS
71cc_t termAytChar;
72# endif
73
74/*
75 * initialize the terminal data structures.
76 */
77
78void
79init_terminal(void)
80{
81    if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) {
82	exit(1);
83    }
84    if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) {
85	exit(1);
86    }
87    autoflush = TerminalAutoFlush();
88}
89
90
91/*
92 *		Send as much data as possible to the terminal.
93 *
94 *		Return value:
95 *			-1: No useful work done, data waiting to go out.
96 *			 0: No data was waiting, so nothing was done.
97 *			 1: All waiting data was written out.
98 *			 n: All data - n was written out.
99 */
100
101
102int
103ttyflush(int drop)
104{
105    int n, n0, n1;
106
107    n0 = ring_full_count(&ttyoring);
108    if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
109	if (drop) {
110	    TerminalFlushOutput();
111	    /* we leave 'n' alone! */
112	} else {
113	    n = TerminalWrite((char *)ttyoring.consume, n);
114	}
115    }
116    if (n > 0) {
117	if (termdata && n) {
118	    Dump('>', ttyoring.consume, n);
119	}
120	/*
121	 * If we wrote everything, and the full count is
122	 * larger than what we wrote, then write the
123	 * rest of the buffer.
124	 */
125	if (n1 == n && n0 > n) {
126		n1 = n0 - n;
127		if (!drop)
128			n1 = TerminalWrite((char *)ttyoring.bottom, n1);
129		if (n1 > 0)
130			n += n1;
131	}
132	ring_consumed(&ttyoring, n);
133    }
134    if (n < 0)
135	return -1;
136    if (n == n0) {
137	if (n0)
138	    return -1;
139	return 0;
140    }
141    return n0 - n + 1;
142}
143
144
145/*
146 * These routines decides on what the mode should be (based on the values
147 * of various global variables).
148 */
149
150
151int
152getconnmode(void)
153{
154    extern int linemode;
155    int mode = 0;
156#ifdef	KLUDGELINEMODE
157    extern int kludgelinemode;
158#endif
159
160    if (my_want_state_is_dont(TELOPT_ECHO))
161	mode |= MODE_ECHO;
162
163    if (localflow)
164	mode |= MODE_FLOW;
165
166    if ((eight & 1) || my_want_state_is_will(TELOPT_BINARY))
167	mode |= MODE_INBIN;
168
169    if (eight & 2)
170	mode |= MODE_OUT8;
171    if (his_want_state_is_will(TELOPT_BINARY))
172	mode |= MODE_OUTBIN;
173
174#ifdef	KLUDGELINEMODE
175    if (kludgelinemode) {
176	if (my_want_state_is_dont(TELOPT_SGA)) {
177	    mode |= (MODE_TRAPSIG|MODE_EDIT);
178	    if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
179		mode &= ~MODE_ECHO;
180	    }
181	}
182	return(mode);
183    }
184#endif
185    if (my_want_state_is_will(TELOPT_LINEMODE))
186	mode |= linemode;
187    return(mode);
188}
189
190    void
191setconnmode(force)
192    int force;
193{
194#ifdef	ENCRYPTION
195    static int enc_passwd = 0;
196#endif
197    int newmode;
198
199    newmode = getconnmode()|(force?MODE_FORCE:0);
200
201    TerminalNewMode(newmode);
202
203#ifdef  ENCRYPTION
204    if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
205	if (my_want_state_is_will(TELOPT_ENCRYPT)
206				&& (enc_passwd == 0) && !encrypt_output) {
207	    encrypt_request_start(0, 0);
208	    enc_passwd = 1;
209	}
210    } else {
211	if (enc_passwd) {
212	    encrypt_request_end();
213	    enc_passwd = 0;
214	}
215    }
216#endif
217
218}
219
220
221    void
222setcommandmode()
223{
224    TerminalNewMode(-1);
225}
226