Annotation of src/usr.bin/telnet/terminal.c, Revision 1.13
1.13 ! jsg 1: /* $OpenBSD: terminal.c,v 1.12 2014/07/20 12:08:55 guenther Exp $ */
1.2 niklas 2: /* $NetBSD: terminal.c,v 1.5 1996/02/28 21:04:17 thorpej Exp $ */
3:
1.1 deraadt 4: /*
5: * Copyright (c) 1988, 1990, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
1.6 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
1.3 art 33: #include "telnet_locl.h"
1.1 deraadt 34:
1.10 guenther 35: #include <arpa/telnet.h>
36: #include <errno.h>
1.9 guenther 37: #include <unistd.h>
38:
1.1 deraadt 39: Ring ttyoring, ttyiring;
40: unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
41:
42: int termdata; /* Debugging flag */
43:
44: # ifndef VDISCARD
45: cc_t termFlushChar;
46: # endif
47: # ifndef VLNEXT
48: cc_t termLiteralNextChar;
49: # endif
50: # ifndef VWERASE
51: cc_t termWerasChar;
52: # endif
53: # ifndef VREPRINT
54: cc_t termRprntChar;
55: # endif
56: # ifndef VSTART
57: cc_t termStartChar;
58: # endif
59: # ifndef VSTOP
60: cc_t termStopChar;
61: # endif
62: # ifndef VEOL
63: cc_t termForw1Char;
64: # endif
65: # ifndef VEOL2
66: cc_t termForw2Char;
67: # endif
68: # ifndef VSTATUS
69: cc_t termAytChar;
70: # endif
71:
72: /*
73: * initialize the terminal data structures.
74: */
75:
1.8 guenther 76: void
1.13 ! jsg 77: init_terminal(void)
1.1 deraadt 78: {
1.9 guenther 79: struct termios tc;
80:
1.8 guenther 81: ring_init(&ttyoring, ttyobuf, sizeof ttyobuf);
82: ring_init(&ttyiring, ttyibuf, sizeof ttyibuf);
1.9 guenther 83:
84: tcgetattr(0, &tc);
85: autoflush = (tc.c_lflag & NOFLSH) == 0;
1.1 deraadt 86: }
87:
88: /*
89: * Send as much data as possible to the terminal.
90: *
91: * Return value:
92: * -1: No useful work done, data waiting to go out.
93: * 0: No data was waiting, so nothing was done.
94: * 1: All waiting data was written out.
95: * n: All data - n was written out.
96: */
97:
1.13 ! jsg 98: int
! 99: ttyflush(int drop)
1.1 deraadt 100: {
1.4 mpech 101: int n, n0, n1;
1.1 deraadt 102:
103: n0 = ring_full_count(&ttyoring);
104: if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
105: if (drop) {
1.9 guenther 106: tcflush(fileno(stdout), TCOFLUSH);
1.1 deraadt 107: /* we leave 'n' alone! */
108: } else {
1.9 guenther 109: n = write(tout, ttyoring.consume, n);
1.1 deraadt 110: }
111: }
112: if (n > 0) {
113: if (termdata && n) {
114: Dump('>', ttyoring.consume, n);
115: }
116: /*
117: * If we wrote everything, and the full count is
118: * larger than what we wrote, then write the
119: * rest of the buffer.
120: */
121: if (n1 == n && n0 > n) {
122: n1 = n0 - n;
123: if (!drop)
1.9 guenther 124: n1 = write(tout, ttyoring.bottom, n1);
1.2 niklas 125: if (n1 > 0)
126: n += n1;
1.1 deraadt 127: }
128: ring_consumed(&ttyoring, n);
129: }
1.5 millert 130: if (n < 0) {
131: if (errno == EPIPE)
132: kill(0, SIGQUIT);
1.1 deraadt 133: return -1;
1.5 millert 134: }
1.1 deraadt 135: if (n == n0) {
136: if (n0)
137: return -1;
138: return 0;
139: }
140: return n0 - n + 1;
141: }
142:
143:
144: /*
145: * These routines decides on what the mode should be (based on the values
146: * of various global variables).
147: */
148:
1.13 ! jsg 149: int
! 150: getconnmode(void)
1.1 deraadt 151: {
152: int mode = 0;
153:
154: if (my_want_state_is_dont(TELOPT_ECHO))
155: mode |= MODE_ECHO;
156:
157: if (localflow)
158: mode |= MODE_FLOW;
159:
1.3 art 160: if ((eight & 1) || my_want_state_is_will(TELOPT_BINARY))
1.1 deraadt 161: mode |= MODE_INBIN;
162:
1.3 art 163: if (eight & 2)
164: mode |= MODE_OUT8;
1.1 deraadt 165: if (his_want_state_is_will(TELOPT_BINARY))
166: mode |= MODE_OUTBIN;
167:
168: #ifdef KLUDGELINEMODE
169: if (kludgelinemode) {
170: if (my_want_state_is_dont(TELOPT_SGA)) {
171: mode |= (MODE_TRAPSIG|MODE_EDIT);
172: if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
173: mode &= ~MODE_ECHO;
174: }
175: }
176: return(mode);
177: }
178: #endif
179: if (my_want_state_is_will(TELOPT_LINEMODE))
180: mode |= linemode;
181: return(mode);
182: }
183:
1.13 ! jsg 184: void
! 185: setconnmode(int force)
1.1 deraadt 186: {
1.4 mpech 187: int newmode;
1.1 deraadt 188:
189: newmode = getconnmode()|(force?MODE_FORCE:0);
190:
191: TerminalNewMode(newmode);
192: }
193:
1.13 ! jsg 194: void
! 195: setcommandmode(void)
1.1 deraadt 196: {
197: TerminalNewMode(-1);
198: }
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