1 /*
2 * Copyright 1994-2002 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 #pragma ident "%Z%%M% %I% %E% SMI"
7
8 /*
9 * usr/src/cmd/cmd-inet/usr.bin/telnet/terminal.c
10 */
11
12 /*
13 * Copyright (c) 1988, 1990, 1993
14 * The Regents of the University of California. All rights reserved.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
24 * 3. All advertising materials mentioning features or use of this software
25 * must display the following acknowledgement:
26 * This product includes software developed by the University of
27 * California, Berkeley and its contributors.
28 * 4. Neither the name of the University nor the names of its contributors
29 * may be used to endorse or promote products derived from this software
30 * without specific prior written permission.
31 *
32 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
35 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 * SUCH DAMAGE.
43 */
44
45 #ifndef lint
46 static char sccsid[] = "@(#)terminal.c 8.1 (Berkeley) 6/6/93";
47 #endif /* not lint */
48
49 #include <arpa/telnet.h>
50 #include <sys/types.h>
51 #include <errno.h>
52
53 #include "ring.h"
54
55 #include "externs.h"
56 #include "types.h"
57
58 Ring ttyoring;
59 Ring ttyiring;
60 static unsigned char ttyobuf[2*BUFSIZ];
61 static unsigned char ttyibuf[BUFSIZ];
62
63 int termdata; /* Debugging flag */
64
65 #ifdef USE_TERMIO
66 cc_t termAytChar;
67 #else
68 cc_t termForw2Char;
69 cc_t termAytChar;
70 #endif
71
72 /*
73 * initialize the terminal data structures.
74 */
75
76 void
init_terminal()77 init_terminal()
78 {
79 if (ring_init(&ttyoring, ttyobuf, sizeof (ttyobuf)) != 1) {
80 exit(1);
81 }
82 if (ring_init(&ttyiring, ttyibuf, sizeof (ttyibuf)) != 1) {
83 exit(1);
84 }
85 autoflush = 1;
86 }
87
88
89 /*
90 * Send as much data as possible to the terminal.
91 *
92 * Return value:
93 * -2: Error occurred other than EWOULDBLOCK; see
94 * 'errno' for specifics
95 * -1: No useful work done, although data was waiting.
96 * This may be due to EWOULDBLOCK error.
97 * 0: No data was waiting, so nothing was done.
98 * 1: All waiting data was written out.
99 * n: Part of data was written. 'n' is the number
100 * of bytes remaining which were not written.
101 */
102
103 int
ttyflush(drop)104 ttyflush(drop)
105 int drop;
106 {
107 register int n, n0, n1;
108
109 n0 = ring_full_count(&ttyoring);
110 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
111 if (drop) {
112 TerminalFlushOutput();
113 /* we leave 'n' alone! */
114 } else {
115 n = TerminalWrite((char *)ttyoring.consume, n);
116 if (n == -1 && errno != EWOULDBLOCK)
117 return (-2);
118 }
119 }
120 if (n > 0) {
121 if (termdata && n) {
122 Dump('>', ttyoring.consume, n);
123 }
124 /*
125 * If we wrote everything, and the full count is
126 * larger than what we wrote, then write the
127 * rest of the buffer.
128 */
129 if (n1 == n && n0 > n) {
130 n1 = n0 - n;
131 if (!drop) {
132 n1 = TerminalWrite((char *)ttyoring.bottom, n1);
133 if (n1 == -1) {
134 if (errno != EWOULDBLOCK)
135 return (-2);
136 n1 = 0;
137 }
138 }
139 n += n1;
140 }
141 ring_consumed(&ttyoring, n);
142 }
143 if (n < 0)
144 return (-1);
145
146 if (n == n0) {
147 if (n0)
148 return (-1);
149 return (0);
150 }
151 return (n0 - n + 1);
152 }
153
154
155 /*
156 * These routines decides on what the mode should be (based on the values
157 * of various global variables).
158 */
159
160
161 int
getconnmode()162 getconnmode()
163 {
164 extern int linemode;
165 int mode = 0;
166 #ifdef KLUDGELINEMODE
167 extern int kludgelinemode;
168 #endif
169
170 if (my_want_state_is_dont(TELOPT_ECHO))
171 mode |= MODE_ECHO;
172
173 if (localflow)
174 mode |= MODE_FLOW;
175
176 if (my_want_state_is_will(TELOPT_BINARY))
177 mode |= MODE_INBIN;
178
179 if (my_want_state_is_do(TELOPT_BINARY))
180 mode |= MODE_OUTBIN;
181
182 #ifdef KLUDGELINEMODE
183 if (kludgelinemode) {
184 if (my_want_state_is_dont(TELOPT_SGA)) {
185 mode |= (MODE_TRAPSIG|MODE_EDIT);
186 if (dontlecho &&
187 (clocks.echotoggle > clocks.modenegotiated)) {
188 mode &= ~MODE_ECHO;
189 }
190 }
191 return (mode);
192 }
193 #endif
194 if (my_want_state_is_will(TELOPT_LINEMODE))
195 mode |= linemode;
196 return (mode);
197 }
198
199 void
setconnmode(force)200 setconnmode(force)
201 int force;
202 {
203 static int enc_passwd = 0;
204 register int newmode;
205
206 newmode = getconnmode()|(force?MODE_FORCE:0);
207
208 TerminalNewMode(newmode);
209
210 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
211 if (my_want_state_is_will(TELOPT_ENCRYPT) &&
212 (enc_passwd == 0) && !encrypt_output) {
213 encrypt_request_start(0, 0);
214 enc_passwd = 1;
215 }
216 } else {
217 if (enc_passwd) {
218 encrypt_request_end();
219 enc_passwd = 0;
220 }
221 }
222 }
223
224
225 void
setcommandmode()226 setcommandmode()
227 {
228 TerminalNewMode(-1);
229 }
230