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Annotation of src/usr.bin/telnet/terminal.c, Revision 1.7

1.7     ! guenther    1: /*     $OpenBSD: terminal.c,v 1.6 2003/06/03 02:56:18 millert Exp $    */
1.2       niklas      2: /*     $NetBSD: terminal.c,v 1.5 1996/02/28 21:04:17 thorpej Exp $     */
                      3:
1.1       deraadt     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.
1.6       millert    16:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    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:
1.3       art        33: #include "telnet_locl.h"
1.1       deraadt    34:
                     35: Ring           ttyoring, ttyiring;
                     36: unsigned char  ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];
                     37:
                     38: int termdata;                  /* Debugging flag */
                     39:
                     40: # ifndef VDISCARD
                     41: cc_t termFlushChar;
                     42: # endif
                     43: # ifndef VLNEXT
                     44: cc_t termLiteralNextChar;
                     45: # endif
                     46: # ifndef VSUSP
                     47: cc_t termSuspChar;
                     48: # endif
                     49: # ifndef VWERASE
                     50: cc_t termWerasChar;
                     51: # endif
                     52: # ifndef VREPRINT
                     53: cc_t termRprntChar;
                     54: # endif
                     55: # ifndef VSTART
                     56: cc_t termStartChar;
                     57: # endif
                     58: # ifndef VSTOP
                     59: cc_t termStopChar;
                     60: # endif
                     61: # ifndef VEOL
                     62: cc_t termForw1Char;
                     63: # endif
                     64: # ifndef VEOL2
                     65: cc_t termForw2Char;
                     66: # endif
                     67: # ifndef VSTATUS
                     68: cc_t termAytChar;
                     69: # endif
                     70:
                     71: /*
                     72:  * initialize the terminal data structures.
                     73:  */
                     74:
                     75:     void
                     76: init_terminal()
                     77: {
                     78:     if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) {
                     79:        exit(1);
                     80:     }
                     81:     if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) {
                     82:        exit(1);
                     83:     }
                     84:     autoflush = TerminalAutoFlush();
                     85: }
                     86:
                     87:
                     88: /*
                     89:  *             Send as much data as possible to the terminal.
                     90:  *
                     91:  *             Return value:
                     92:  *                     -1: No useful work done, data waiting to go out.
                     93:  *                      0: No data was waiting, so nothing was done.
                     94:  *                      1: All waiting data was written out.
                     95:  *                      n: All data - n was written out.
                     96:  */
                     97:
                     98:
                     99:     int
                    100: ttyflush(drop)
                    101:     int drop;
                    102: {
1.4       mpech     103:     int n, n0, n1;
1.1       deraadt   104:
                    105:     n0 = ring_full_count(&ttyoring);
                    106:     if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
                    107:        if (drop) {
                    108:            TerminalFlushOutput();
                    109:            /* we leave 'n' alone! */
                    110:        } else {
1.3       art       111:            n = TerminalWrite((char *)ttyoring.consume, n);
1.1       deraadt   112:        }
                    113:     }
                    114:     if (n > 0) {
                    115:        if (termdata && n) {
                    116:            Dump('>', ttyoring.consume, n);
                    117:        }
                    118:        /*
                    119:         * If we wrote everything, and the full count is
                    120:         * larger than what we wrote, then write the
                    121:         * rest of the buffer.
                    122:         */
                    123:        if (n1 == n && n0 > n) {
                    124:                n1 = n0 - n;
                    125:                if (!drop)
                    126:                        n1 = TerminalWrite(ttyoring.bottom, n1);
1.2       niklas    127:                if (n1 > 0)
                    128:                        n += n1;
1.1       deraadt   129:        }
                    130:        ring_consumed(&ttyoring, n);
                    131:     }
1.5       millert   132:     if (n < 0) {
                    133:        if (errno == EPIPE)
                    134:                kill(0, SIGQUIT);
1.1       deraadt   135:        return -1;
1.5       millert   136:     }
1.1       deraadt   137:     if (n == n0) {
                    138:        if (n0)
                    139:            return -1;
                    140:        return 0;
                    141:     }
                    142:     return n0 - n + 1;
                    143: }
                    144:
                    145: 
                    146: /*
                    147:  * These routines decides on what the mode should be (based on the values
                    148:  * of various global variables).
                    149:  */
                    150:
                    151:
                    152:     int
                    153: getconnmode()
                    154: {
                    155:     extern int linemode;
                    156:     int mode = 0;
                    157: #ifdef KLUDGELINEMODE
                    158:     extern int kludgelinemode;
                    159: #endif
                    160:
                    161:     if (my_want_state_is_dont(TELOPT_ECHO))
                    162:        mode |= MODE_ECHO;
                    163:
                    164:     if (localflow)
                    165:        mode |= MODE_FLOW;
                    166:
1.3       art       167:     if ((eight & 1) || my_want_state_is_will(TELOPT_BINARY))
1.1       deraadt   168:        mode |= MODE_INBIN;
                    169:
1.3       art       170:     if (eight & 2)
                    171:        mode |= MODE_OUT8;
1.1       deraadt   172:     if (his_want_state_is_will(TELOPT_BINARY))
                    173:        mode |= MODE_OUTBIN;
                    174:
                    175: #ifdef KLUDGELINEMODE
                    176:     if (kludgelinemode) {
                    177:        if (my_want_state_is_dont(TELOPT_SGA)) {
                    178:            mode |= (MODE_TRAPSIG|MODE_EDIT);
                    179:            if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
                    180:                mode &= ~MODE_ECHO;
                    181:            }
                    182:        }
                    183:        return(mode);
                    184:     }
                    185: #endif
                    186:     if (my_want_state_is_will(TELOPT_LINEMODE))
                    187:        mode |= linemode;
                    188:     return(mode);
                    189: }
                    190:
                    191:     void
                    192: setconnmode(force)
                    193:     int force;
                    194: {
1.4       mpech     195:     int newmode;
1.1       deraadt   196:
                    197:     newmode = getconnmode()|(force?MODE_FORCE:0);
                    198:
                    199:     TerminalNewMode(newmode);
                    200: }
                    201:
                    202:
                    203:     void
                    204: setcommandmode()
                    205: {
                    206:     TerminalNewMode(-1);
                    207: }