1 /*
2 * Copyright 1994-2002 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 /*
7 * usr/src/cmd/cmd-inet/usr.bin/telnet/terminal.c
8 */
9
10 /*
11 * Copyright (c) 1988, 1990, 1993
12 * The Regents of the University of California. All rights reserved.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. All advertising materials mentioning features or use of this software
23 * must display the following acknowledgement:
24 * This product includes software developed by the University of
25 * California, Berkeley and its contributors.
26 * 4. Neither the name of the University nor the names of its contributors
27 * may be used to endorse or promote products derived from this software
28 * without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * SUCH DAMAGE.
41 */
42
43 #ifndef lint
44 static char sccsid[] = "@(#)terminal.c 8.1 (Berkeley) 6/6/93";
45 #endif /* not lint */
46
47 #include <arpa/telnet.h>
48 #include <sys/types.h>
49 #include <errno.h>
50
51 #include "ring.h"
52
53 #include "externs.h"
54 #include "types.h"
55
56 Ring ttyoring;
57 Ring ttyiring;
58 static unsigned char ttyobuf[2*BUFSIZ];
59 static unsigned char ttyibuf[BUFSIZ];
60
61 int termdata; /* Debugging flag */
62
63 #ifdef USE_TERMIO
64 cc_t termAytChar;
65 #else
66 cc_t termForw2Char;
67 cc_t termAytChar;
68 #endif
69
70 /*
71 * initialize the terminal data structures.
72 */
73
74 void
init_terminal()75 init_terminal()
76 {
77 if (ring_init(&ttyoring, ttyobuf, sizeof (ttyobuf)) != 1) {
78 exit(1);
79 }
80 if (ring_init(&ttyiring, ttyibuf, sizeof (ttyibuf)) != 1) {
81 exit(1);
82 }
83 autoflush = 1;
84 }
85
86
87 /*
88 * Send as much data as possible to the terminal.
89 *
90 * Return value:
91 * -2: Error occurred other than EWOULDBLOCK; see
92 * 'errno' for specifics
93 * -1: No useful work done, although data was waiting.
94 * This may be due to EWOULDBLOCK error.
95 * 0: No data was waiting, so nothing was done.
96 * 1: All waiting data was written out.
97 * n: Part of data was written. 'n' is the number
98 * of bytes remaining which were not written.
99 */
100
101 int
ttyflush(drop)102 ttyflush(drop)
103 int drop;
104 {
105 register 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 if (n == -1 && errno != EWOULDBLOCK)
115 return (-2);
116 }
117 }
118 if (n > 0) {
119 if (termdata && n) {
120 Dump('>', ttyoring.consume, n);
121 }
122 /*
123 * If we wrote everything, and the full count is
124 * larger than what we wrote, then write the
125 * rest of the buffer.
126 */
127 if (n1 == n && n0 > n) {
128 n1 = n0 - n;
129 if (!drop) {
130 n1 = TerminalWrite((char *)ttyoring.bottom, n1);
131 if (n1 == -1) {
132 if (errno != EWOULDBLOCK)
133 return (-2);
134 n1 = 0;
135 }
136 }
137 n += n1;
138 }
139 ring_consumed(&ttyoring, n);
140 }
141 if (n < 0)
142 return (-1);
143
144 if (n == n0) {
145 if (n0)
146 return (-1);
147 return (0);
148 }
149 return (n0 - n + 1);
150 }
151
152
153 /*
154 * These routines decides on what the mode should be (based on the values
155 * of various global variables).
156 */
157
158
159 int
getconnmode()160 getconnmode()
161 {
162 extern int linemode;
163 int mode = 0;
164 #ifdef KLUDGELINEMODE
165 extern int kludgelinemode;
166 #endif
167
168 if (my_want_state_is_dont(TELOPT_ECHO))
169 mode |= MODE_ECHO;
170
171 if (localflow)
172 mode |= MODE_FLOW;
173
174 if (my_want_state_is_will(TELOPT_BINARY))
175 mode |= MODE_INBIN;
176
177 if (my_want_state_is_do(TELOPT_BINARY))
178 mode |= MODE_OUTBIN;
179
180 #ifdef KLUDGELINEMODE
181 if (kludgelinemode) {
182 if (my_want_state_is_dont(TELOPT_SGA)) {
183 mode |= (MODE_TRAPSIG|MODE_EDIT);
184 if (dontlecho &&
185 (clocks.echotoggle > clocks.modenegotiated)) {
186 mode &= ~MODE_ECHO;
187 }
188 }
189 return (mode);
190 }
191 #endif
192 if (my_want_state_is_will(TELOPT_LINEMODE))
193 mode |= linemode;
194 return (mode);
195 }
196
197 void
setconnmode(force)198 setconnmode(force)
199 int force;
200 {
201 static int enc_passwd = 0;
202 register int newmode;
203
204 newmode = getconnmode()|(force?MODE_FORCE:0);
205
206 TerminalNewMode(newmode);
207
208 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
209 if (my_want_state_is_will(TELOPT_ENCRYPT) &&
210 (enc_passwd == 0) && !encrypt_output) {
211 encrypt_request_start(0, 0);
212 enc_passwd = 1;
213 }
214 } else {
215 if (enc_passwd) {
216 encrypt_request_end();
217 enc_passwd = 0;
218 }
219 }
220 }
221
222
223 void
setcommandmode()224 setcommandmode()
225 {
226 TerminalNewMode(-1);
227 }
228