1/*	$OpenBSD: terminal.c,v 1.14 2017/07/07 09:14:26 fcambus Exp $	*/
2/*	$NetBSD: terminal.c,v 1.5 1996/02/28 21:04:17 thorpej Exp $	*/
3
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.
16 * 3. Neither the name of the University nor the names of its contributors
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
33#include "telnet_locl.h"
34
35#include <arpa/telnet.h>
36#include <errno.h>
37#include <unistd.h>
38
39Ring		ttyoring, ttyiring;
40unsigned char	ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
41
42int termdata;			/* Debugging flag */
43
44/*
45 * initialize the terminal data structures.
46 */
47
48void
49init_terminal(void)
50{
51	struct termios tc;
52
53	ring_init(&ttyoring, ttyobuf, sizeof ttyobuf);
54	ring_init(&ttyiring, ttyibuf, sizeof ttyibuf);
55
56	tcgetattr(0, &tc);
57	autoflush = (tc.c_lflag & NOFLSH) == 0;
58}
59
60/*
61 *		Send as much data as possible to the terminal.
62 *
63 *		Return value:
64 *			-1: No useful work done, data waiting to go out.
65 *			 0: No data was waiting, so nothing was done.
66 *			 1: All waiting data was written out.
67 *			 n: All data - n was written out.
68 */
69
70int
71ttyflush(int drop)
72{
73    int n, n0, n1;
74
75    n0 = ring_full_count(&ttyoring);
76    if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
77	if (drop) {
78	    tcflush(fileno(stdout), TCOFLUSH);
79	    /* we leave 'n' alone! */
80	} else {
81	    n = write(tout, ttyoring.consume, n);
82	}
83    }
84    if (n > 0) {
85	if (termdata && n) {
86	    Dump('>', ttyoring.consume, n);
87	}
88	/*
89	 * If we wrote everything, and the full count is
90	 * larger than what we wrote, then write the
91	 * rest of the buffer.
92	 */
93	if (n1 == n && n0 > n) {
94		n1 = n0 - n;
95		if (!drop)
96			n1 = write(tout, ttyoring.bottom, n1);
97		if (n1 > 0)
98			n += n1;
99	}
100	ring_consumed(&ttyoring, n);
101    }
102    if (n < 0) {
103	if (errno == EPIPE)
104		kill(0, SIGQUIT);
105	return -1;
106    }
107    if (n == n0) {
108	if (n0)
109	    return -1;
110	return 0;
111    }
112    return n0 - n + 1;
113}
114
115
116/*
117 * These routines decides on what the mode should be (based on the values
118 * of various global variables).
119 */
120
121int
122getconnmode(void)
123{
124    int mode = 0;
125
126    if (my_want_state_is_dont(TELOPT_ECHO))
127	mode |= MODE_ECHO;
128
129    if (localflow)
130	mode |= MODE_FLOW;
131
132    if ((eight & 1) || my_want_state_is_will(TELOPT_BINARY))
133	mode |= MODE_INBIN;
134
135    if (eight & 2)
136	mode |= MODE_OUT8;
137    if (his_want_state_is_will(TELOPT_BINARY))
138	mode |= MODE_OUTBIN;
139
140#ifdef	KLUDGELINEMODE
141    if (kludgelinemode) {
142	if (my_want_state_is_dont(TELOPT_SGA)) {
143	    mode |= (MODE_TRAPSIG|MODE_EDIT);
144	    if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
145		mode &= ~MODE_ECHO;
146	    }
147	}
148	return(mode);
149    }
150#endif
151    if (my_want_state_is_will(TELOPT_LINEMODE))
152	mode |= linemode;
153    return(mode);
154}
155
156void
157setconnmode(int force)
158{
159    int newmode;
160
161    newmode = getconnmode()|(force?MODE_FORCE:0);
162
163    TerminalNewMode(newmode);
164}
165
166void
167setcommandmode(void)
168{
169    TerminalNewMode(-1);
170}
171