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 1.2 2003/06/17 04:29:32 dillon Exp $ 36 */ 37 38 #include <arpa/telnet.h> 39 #include <sys/types.h> 40 41 #include "ring.h" 42 43 #include "externs.h" 44 #include "types.h" 45 46 47 Ring ttyoring, ttyiring; 48 unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ]; 49 50 int termdata; /* Debugging flag */ 51 52 #ifdef USE_TERMIO 53 # ifndef VDISCARD 54 cc_t termFlushChar; 55 # endif 56 # ifndef VLNEXT 57 cc_t termLiteralNextChar; 58 # endif 59 # ifndef VSUSP 60 cc_t termSuspChar; 61 # endif 62 # ifndef VWERASE 63 cc_t termWerasChar; 64 # endif 65 # ifndef VREPRINT 66 cc_t termRprntChar; 67 # endif 68 # ifndef VSTART 69 cc_t termStartChar; 70 # endif 71 # ifndef VSTOP 72 cc_t termStopChar; 73 # endif 74 # ifndef VEOL 75 cc_t termForw1Char; 76 # endif 77 # ifndef VEOL2 78 cc_t termForw2Char; 79 # endif 80 # ifndef VSTATUS 81 cc_t termAytChar; 82 # endif 83 #else 84 cc_t termForw2Char; 85 cc_t termAytChar; 86 #endif 87 88 /* 89 * initialize the terminal data structures. 90 */ 91 92 void 93 init_terminal(void) 94 { 95 if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) { 96 exit(1); 97 } 98 if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) { 99 exit(1); 100 } 101 autoflush = TerminalAutoFlush(); 102 } 103 104 /* 105 * Send as much data as possible to the terminal. 106 * 107 * Return value: 108 * -1: No useful work done, data waiting to go out. 109 * 0: No data was waiting, so nothing was done. 110 * 1: All waiting data was written out. 111 * n: All data - n was written out. 112 */ 113 114 int 115 ttyflush(int drop) 116 { 117 int n, n0, n1; 118 119 n0 = ring_full_count(&ttyoring); 120 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) { 121 if (drop) { 122 TerminalFlushOutput(); 123 /* we leave 'n' alone! */ 124 } else { 125 n = TerminalWrite(ttyoring.consume, n); 126 } 127 } 128 if (n > 0) { 129 if (termdata && n) { 130 Dump('>', ttyoring.consume, n); 131 } 132 /* 133 * If we wrote everything, and the full count is 134 * larger than what we wrote, then write the 135 * rest of the buffer. 136 */ 137 if (n1 == n && n0 > n) { 138 n1 = n0 - n; 139 if (!drop) 140 n1 = TerminalWrite(ttyoring.bottom, n1); 141 if (n1 > 0) 142 n += n1; 143 } 144 ring_consumed(&ttyoring, n); 145 } 146 if (n < 0) 147 return -1; 148 if (n == n0) { 149 if (n0) 150 return -1; 151 return 0; 152 } 153 return n0 - n + 1; 154 } 155 156 157 /* 158 * These routines decides on what the mode should be (based on the values 159 * of various global variables). 160 */ 161 162 163 int 164 getconnmode(void) 165 { 166 extern int linemode; 167 int mode = 0; 168 #ifdef KLUDGELINEMODE 169 extern int kludgelinemode; 170 #endif 171 172 if (my_want_state_is_dont(TELOPT_ECHO)) 173 mode |= MODE_ECHO; 174 175 if (localflow) 176 mode |= MODE_FLOW; 177 178 if (my_want_state_is_will(TELOPT_BINARY)) 179 mode |= MODE_INBIN; 180 181 if (his_want_state_is_will(TELOPT_BINARY)) 182 mode |= MODE_OUTBIN; 183 184 #ifdef KLUDGELINEMODE 185 if (kludgelinemode) { 186 if (my_want_state_is_dont(TELOPT_SGA)) { 187 mode |= (MODE_TRAPSIG|MODE_EDIT); 188 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) { 189 mode &= ~MODE_ECHO; 190 } 191 } 192 return(mode); 193 } 194 #endif 195 if (my_want_state_is_will(TELOPT_LINEMODE)) 196 mode |= linemode; 197 return(mode); 198 } 199 200 void 201 setconnmode(int force) 202 { 203 int newmode; 204 205 newmode = getconnmode()|(force?MODE_FORCE:0); 206 207 TerminalNewMode(newmode); 208 209 210 } 211 212 void 213 setcommandmode(void) 214 { 215 TerminalNewMode(-1); 216 } 217