1 /* 2 * Copyright (c) 1988, 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)terminal.c 8.2 (Berkeley) 2/16/95 34 * $FreeBSD: src/usr.bin/telnet/terminal.c,v 1.3.6.1 2002/04/13 11:07:13 markm Exp $ 35 * $DragonFly: src/usr.bin/telnet/terminal.c,v 1.3 2007/11/25 01:28:23 swildner Exp $ 36 */ 37 38 #include <arpa/telnet.h> 39 #include <sys/types.h> 40 #include <stdlib.h> 41 42 #include "ring.h" 43 44 #include "externs.h" 45 #include "types.h" 46 47 48 Ring ttyoring, ttyiring; 49 unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ]; 50 51 int termdata; /* Debugging flag */ 52 53 #ifdef USE_TERMIO 54 # ifndef VDISCARD 55 cc_t termFlushChar; 56 # endif 57 # ifndef VLNEXT 58 cc_t termLiteralNextChar; 59 # endif 60 # ifndef VSUSP 61 cc_t termSuspChar; 62 # endif 63 # ifndef VWERASE 64 cc_t termWerasChar; 65 # endif 66 # ifndef VREPRINT 67 cc_t termRprntChar; 68 # endif 69 # ifndef VSTART 70 cc_t termStartChar; 71 # endif 72 # ifndef VSTOP 73 cc_t termStopChar; 74 # endif 75 # ifndef VEOL 76 cc_t termForw1Char; 77 # endif 78 # ifndef VEOL2 79 cc_t termForw2Char; 80 # endif 81 # ifndef VSTATUS 82 cc_t termAytChar; 83 # endif 84 #else 85 cc_t termForw2Char; 86 cc_t termAytChar; 87 #endif 88 89 /* 90 * initialize the terminal data structures. 91 */ 92 93 void 94 init_terminal(void) 95 { 96 if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) { 97 exit(1); 98 } 99 if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) { 100 exit(1); 101 } 102 autoflush = TerminalAutoFlush(); 103 } 104 105 /* 106 * Send as much data as possible to the terminal. 107 * 108 * Return value: 109 * -1: No useful work done, data waiting to go out. 110 * 0: No data was waiting, so nothing was done. 111 * 1: All waiting data was written out. 112 * n: All data - n was written out. 113 */ 114 115 int 116 ttyflush(int drop) 117 { 118 int n, n0, n1; 119 120 n0 = ring_full_count(&ttyoring); 121 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) { 122 if (drop) { 123 TerminalFlushOutput(); 124 /* we leave 'n' alone! */ 125 } else { 126 n = TerminalWrite(ttyoring.consume, n); 127 } 128 } 129 if (n > 0) { 130 if (termdata && n) { 131 Dump('>', ttyoring.consume, n); 132 } 133 /* 134 * If we wrote everything, and the full count is 135 * larger than what we wrote, then write the 136 * rest of the buffer. 137 */ 138 if (n1 == n && n0 > n) { 139 n1 = n0 - n; 140 if (!drop) 141 n1 = TerminalWrite(ttyoring.bottom, n1); 142 if (n1 > 0) 143 n += n1; 144 } 145 ring_consumed(&ttyoring, n); 146 } 147 if (n < 0) 148 return -1; 149 if (n == n0) { 150 if (n0) 151 return -1; 152 return 0; 153 } 154 return n0 - n + 1; 155 } 156 157 158 /* 159 * These routines decides on what the mode should be (based on the values 160 * of various global variables). 161 */ 162 163 164 int 165 getconnmode(void) 166 { 167 extern int linemode; 168 int mode = 0; 169 #ifdef KLUDGELINEMODE 170 extern int kludgelinemode; 171 #endif 172 173 if (my_want_state_is_dont(TELOPT_ECHO)) 174 mode |= MODE_ECHO; 175 176 if (localflow) 177 mode |= MODE_FLOW; 178 179 if (my_want_state_is_will(TELOPT_BINARY)) 180 mode |= MODE_INBIN; 181 182 if (his_want_state_is_will(TELOPT_BINARY)) 183 mode |= MODE_OUTBIN; 184 185 #ifdef KLUDGELINEMODE 186 if (kludgelinemode) { 187 if (my_want_state_is_dont(TELOPT_SGA)) { 188 mode |= (MODE_TRAPSIG|MODE_EDIT); 189 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) { 190 mode &= ~MODE_ECHO; 191 } 192 } 193 return(mode); 194 } 195 #endif 196 if (my_want_state_is_will(TELOPT_LINEMODE)) 197 mode |= linemode; 198 return(mode); 199 } 200 201 void 202 setconnmode(int force) 203 { 204 int newmode; 205 206 newmode = getconnmode()|(force?MODE_FORCE:0); 207 208 TerminalNewMode(newmode); 209 210 211 } 212 213 void 214 setcommandmode(void) 215 { 216 TerminalNewMode(-1); 217 } 218