terminal.c revision 1.9 1 /* $NetBSD: terminal.c,v 1.9 2003/03/15 04:48:22 christos Exp $ */
2
3 /*
4 * Copyright (c) 1988, 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/cdefs.h>
37 #ifndef lint
38 #if 0
39 static char sccsid[] = "@(#)terminal.c 8.2 (Berkeley) 2/16/95";
40 #else
41 __RCSID("$NetBSD: terminal.c,v 1.9 2003/03/15 04:48:22 christos Exp $");
42 #endif
43 #endif /* not lint */
44
45 #include <arpa/telnet.h>
46 #include <sys/types.h>
47
48 #include "ring.h"
49
50 #include "externs.h"
51 #include "types.h"
52
53 #ifdef ENCRYPTION
54 #include <libtelnet/encrypt.h>
55 #endif
56
57 Ring ttyoring, ttyiring;
58 unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
59
60 int termdata; /* Debugging flag */
61
62 #ifdef USE_TERMIO
63 # ifndef VDISCARD
64 cc_t termFlushChar;
65 # endif
66 # ifndef VLNEXT
67 cc_t termLiteralNextChar;
68 # endif
69 # ifndef VSUSP
70 cc_t termSuspChar;
71 # endif
72 # ifndef VWERASE
73 cc_t termWerasChar;
74 # endif
75 # ifndef VREPRINT
76 cc_t termRprntChar;
77 # endif
78 # ifndef VSTART
79 cc_t termStartChar;
80 # endif
81 # ifndef VSTOP
82 cc_t termStopChar;
83 # endif
84 # ifndef VEOL
85 cc_t termForw1Char;
86 # endif
87 # ifndef VEOL2
88 cc_t termForw2Char;
89 # endif
90 # ifndef VSTATUS
91 cc_t termAytChar;
92 # endif
93 #else
94 cc_t termForw2Char;
95 cc_t termAytChar;
96 #endif
97
98 /*
99 * initialize the terminal data structures.
100 */
101
102 void
103 init_terminal()
104 {
105 if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) {
106 exit(1);
107 }
108 if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) {
109 exit(1);
110 }
111 autoflush = TerminalAutoFlush();
112 }
113
114
115 /*
116 * Send as much data as possible to the terminal.
117 *
118 * Return value:
119 * -2: Permanent error writing to FD.
120 * -1: No useful work done, data waiting to go out.
121 * 0: No data was waiting, so nothing was done.
122 * 1: All waiting data was written out.
123 * n: All data - n was written out.
124 */
125
126
127 int
128 ttyflush(drop)
129 int drop;
130 {
131 int n, n0, n1;
132
133 n0 = ring_full_count(&ttyoring);
134 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
135 if (drop) {
136 TerminalFlushOutput();
137 /* we leave 'n' alone! */
138 } else {
139 n = TerminalWrite(ttyoring.consume, n);
140 }
141 }
142 if (n > 0) {
143 if (termdata && n) {
144 Dump('>', ttyoring.consume, n);
145 }
146 /*
147 * If we wrote everything, and the full count is
148 * larger than what we wrote, then write the
149 * rest of the buffer.
150 */
151 if (n1 == n && n0 > n) {
152 n1 = n0 - n;
153 if (!drop)
154 n1 = TerminalWrite(ttyoring.bottom, n1);
155 if (n1 > 0)
156 n += n1;
157 }
158 ring_consumed(&ttyoring, n);
159 }
160 if (n < 0) {
161 if (errno == EAGAIN)
162 return -1;
163 else
164 return -2;
165 }
166 if (n == n0) {
167 if (n0)
168 return -1;
169 return 0;
170 }
171 return n0 - n + 1;
172 }
173
174
175 /*
177 * These routines decides on what the mode should be (based on the values
178 * of various global variables).
179 */
180
181
182 int
183 getconnmode()
184 {
185 extern int linemode;
186 int mode = 0;
187 #ifdef KLUDGELINEMODE
188 extern int kludgelinemode;
189 #endif
190
191 if (In3270)
192 return(MODE_FLOW);
193
194 if (my_want_state_is_dont(TELOPT_ECHO))
195 mode |= MODE_ECHO;
196
197 if (localflow)
198 mode |= MODE_FLOW;
199
200 if (my_want_state_is_will(TELOPT_BINARY))
201 mode |= MODE_INBIN;
202
203 if (his_want_state_is_will(TELOPT_BINARY))
204 mode |= MODE_OUTBIN;
205
206 #ifdef KLUDGELINEMODE
207 if (kludgelinemode) {
208 if (my_want_state_is_dont(TELOPT_SGA)) {
209 mode |= (MODE_TRAPSIG|MODE_EDIT);
210 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
211 mode &= ~MODE_ECHO;
212 }
213 }
214 return(mode);
215 }
216 #endif
217 if (my_want_state_is_will(TELOPT_LINEMODE))
218 mode |= linemode;
219 return(mode);
220 }
221
222 void
223 setconnmode(force)
224 int force;
225 {
226 #ifdef ENCRYPTION
227 static int enc_passwd = 0;
228 #endif
229 int newmode;
230
231 newmode = getconnmode()|(force?MODE_FORCE:0);
232
233 TerminalNewMode(newmode);
234
235 #ifdef ENCRYPTION
236 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
237 if (my_want_state_is_will(TELOPT_ENCRYPT)
238 && (enc_passwd == 0) && !encrypt_output) {
239 encrypt_request_start(0, 0);
240 enc_passwd = 1;
241 }
242 } else {
243 if (enc_passwd) {
244 encrypt_request_end();
245 enc_passwd = 0;
246 }
247 }
248 #endif /* ENCRYPTION */
249 }
250
251
252 void
253 setcommandmode()
254 {
255 TerminalNewMode(-1);
256 }
257