usr.bin/telnet/terminal.c

   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 \f
 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 }