telnet.tproj/terminal.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1988, 1990, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57 #ifndef lint
  58 static char sccsid[] = "@(#)terminal.c  8.2 (Berkeley) 2/16/95";
  59 #endif /* not lint */
  60
  61 #include <arpa/telnet.h>
  62 #include <sys/types.h>
  63
  64 #include "ring.h"
  65
  66 #include "externs.h"
  67 #include "types.h"
  68
  69 Ring            ttyoring, ttyiring;
  70 unsigned char   ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
  71
  72 int termdata;                   /* Debugging flag */
  73
  74 #ifdef  USE_TERMIO
  75 # ifndef VDISCARD
  76 cc_t termFlushChar;
  77 # endif
  78 # ifndef VLNEXT
  79 cc_t termLiteralNextChar;
  80 # endif
  81 # ifndef VSUSP
  82 cc_t termSuspChar;
  83 # endif
  84 # ifndef VWERASE
  85 cc_t termWerasChar;
  86 # endif
  87 # ifndef VREPRINT
  88 cc_t termRprntChar;
  89 # endif
  90 # ifndef VSTART
  91 cc_t termStartChar;
  92 # endif
  93 # ifndef VSTOP
  94 cc_t termStopChar;
  95 # endif
  96 # ifndef VEOL
  97 cc_t termForw1Char;
  98 # endif
  99 # ifndef VEOL2
 100 cc_t termForw2Char;
 101 # endif
 102 # ifndef VSTATUS
 103 cc_t termAytChar;
 104 # endif
 105 #else
 106 cc_t termForw2Char;
 107 cc_t termAytChar;
 108 #endif
 109
 110 /*
 111  * initialize the terminal data structures.
 112  */
 113
 114     void
 115 init_terminal()
 116 {
 117     if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) {
 118         exit(1);
 119     }
 120     if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) {
 121         exit(1);
 122     }
 123     autoflush = TerminalAutoFlush();
 124 }
 125
 126
 127 /*
 128  *              Send as much data as possible to the terminal.
 129  *
 130  *              Return value:
 131  *                      -1: No useful work done, data waiting to go out.
 132  *                       0: No data was waiting, so nothing was done.
 133  *                       1: All waiting data was written out.
 134  *                       n: All data - n was written out.
 135  */
 136
 137
 138     int
 139 ttyflush(drop)
 140     int drop;
 141 {
 142     register int n, n0, n1;
 143
 144     n0 = ring_full_count(&ttyoring);
 145     if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
 146         if (drop) {
 147             TerminalFlushOutput();
 148             /* we leave 'n' alone! */
 149         } else {
 150             n = TerminalWrite(ttyoring.consume, n);
 151         }
 152     }
 153     if (n > 0) {
 154         if (termdata && n) {
 155             Dump('>', ttyoring.consume, n);
 156         }
 157         /*
 158          * If we wrote everything, and the full count is
 159          * larger than what we wrote, then write the
 160          * rest of the buffer.
 161          */
 162         if (n1 == n && n0 > n) {
 163                 n1 = n0 - n;
 164                 if (!drop)
 165                         n1 = TerminalWrite(ttyoring.bottom, n1);
 166                 if (n1 > 0)
 167                         n += n1;
 168         }
 169         ring_consumed(&ttyoring, n);
 170     }
 171     if (n < 0)
 172         return -1;
 173     if (n == n0) {
 174         if (n0)
 175             return -1;
 176         return 0;
 177     }
 178     return n0 - n + 1;
 179 }
 180
 181 \f
 182 /*
 183  * These routines decides on what the mode should be (based on the values
 184  * of various global variables).
 185  */
 186
 187
 188     int
 189 getconnmode()
 190 {
 191     extern int linemode;
 192     int mode = 0;
 193 #ifdef  KLUDGELINEMODE
 194     extern int kludgelinemode;
 195 #endif
 196
 197     if (In3270)
 198         return(MODE_FLOW);
 199
 200     if (my_want_state_is_dont(TELOPT_ECHO))
 201         mode |= MODE_ECHO;
 202
 203     if (localflow)
 204         mode |= MODE_FLOW;
 205
 206     if (my_want_state_is_will(TELOPT_BINARY))
 207         mode |= MODE_INBIN;
 208
 209     if (his_want_state_is_will(TELOPT_BINARY))
 210         mode |= MODE_OUTBIN;
 211
 212 #ifdef  KLUDGELINEMODE
 213     if (kludgelinemode) {
 214         if (my_want_state_is_dont(TELOPT_SGA)) {
 215             mode |= (MODE_TRAPSIG|MODE_EDIT);
 216             if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
 217                 mode &= ~MODE_ECHO;
 218             }
 219         }
 220         return(mode);
 221     }
 222 #endif
 223     if (my_want_state_is_will(TELOPT_LINEMODE))
 224         mode |= linemode;
 225     return(mode);
 226 }
 227
 228     void
 229 setconnmode(force)
 230     int force;
 231 {
 232 #ifdef  ENCRYPTION
 233     static int enc_passwd = 0;
 234 #endif  /* ENCRYPTION */
 235     register int newmode;
 236
 237     newmode = getconnmode()|(force?MODE_FORCE:0);
 238
 239     TerminalNewMode(newmode);
 240
 241 #ifdef  ENCRYPTION
 242     if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) {
 243         if (my_want_state_is_will(TELOPT_ENCRYPT)
 244                                 && (enc_passwd == 0) && !encrypt_output) {
 245             encrypt_request_start(0, 0);
 246             enc_passwd = 1;
 247         }
 248     } else {
 249         if (enc_passwd) {
 250             encrypt_request_end();
 251             enc_passwd = 0;
 252         }
 253     }
 254 #endif  /* ENCRYPTION */
 255
 256 }
 257
 258
 259     void
 260 setcommandmode()
 261 {
 262     TerminalNewMode(-1);
 263 }